zte umts nb-amr rate control feature guide
DESCRIPTION
MANUALTRANSCRIPT
NB-AMR Rate Control
Feature Guide
NB-AMR Rate Control
ZTE Confidential Proprietary 1
NB-AMR Rate Control
Version Date Author Reviewer Notes
V1.00 2014/02/8 Huang He Wang Juntao First edition
© 2014 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used
without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document is subjected to
change without notice.
NB-AMR Rate Control
ZTE Confidential Proprietary 2
TABLE OF CONTENTS
1 Feature Attribute ............................................................................................... 6
2 Overview ............................................................................................................ 6
2.1 Feature Introduction ............................................................................................. 6
2.1.1 ZWF21-02-001 CS Conversational RAB for AMR Speech ................................... 8
2.1.2 ZWF21-04-005 AMR Rate Controlling.................................................................. 8
2.1.3 ZWF21-06-002 TrFO ........................................................................................... 9
2.2 License Control .................................................................................................. 10
2.3 Correlation With Other Features ........................................................................ 10
3 Technical Description ..................................................................................... 11
3.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 11
3.1.1 NB-AMR Rate Selection..................................................................................... 11
3.1.2 Combination of the NB-AMR and PS Services ................................................... 12
3.1.3 NB-AMR Mobility ............................................................................................... 12
3.1.4 Directed Retry of the NB-AMR Service During RAB Assignment ....................... 12
3.1.5 AMR Rate Control After Relocation .................................................................... 13
3.1.6 Default Configuration of NB-AMR Rates: 12.2 kbps, 12.2/7.95/5.9/4.75 kbps,
and 7.95 kbps .................................................................................................... 13
3.1.7 RAB Modification of NB-AMR ............................................................................ 14
3.1.8 Signaling Flow of the AMR Service .................................................................... 14
3.2 ZWF21-04-005 AMR Rate Controlling................................................................ 17
3.2.1 Classification of AMR Dynamic Rate Adjustment ............................................... 17
3.2.2 AMR Dynamic Rate Adjustment Based on Radio Link Transmit Power .............. 18
3.2.3 Dynamic Adjustment Triggered by Load ............................................................ 24
3.2.4 Dynamic Adjustment Triggered by Resource Congestion .................................. 24
3.3 ZWF21-06-002 TrFO ......................................................................................... 25
3.3.1 OoBTC Out of Band Transcoder Control ............................................................ 26
3.3.2 Iu UP Initialization .............................................................................................. 27
3.3.3 Iu UP Rate Control ............................................................................................. 28
4 Parameters ....................................................................................................... 30
4.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 30
4.2 ZWF21-04-005 AMR Rate Controlling................................................................ 33
4.2.1 Uplink Rate Adjustment Based on the UE Transmitted Power ........................... 33
4.2.2 Downlink Rate Adjustment Based on the Dedicated Measurement of Node B
Transmitted Power ............................................................................................. 36
4.2.3 Dynamic Adjustment Triggered by Load and Resource Congestion ................... 43
4.3 ZWF21-06-002 TrFO ......................................................................................... 44
NB-AMR Rate Control
ZTE Confidential Proprietary 3
5 Related Counters and Alarms ........................................................................ 45
5.1 Related Counters ............................................................................................... 45
5.2 Related Alarms .................................................................................................. 49
6 Engineering Guide .......................................................................................... 49
6.1 Application Scenario .......................................................................................... 49
6.1.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 49
6.1.2 ZWF21-04-005 AMR Rate Controlling................................................................ 49
6.1.3 ZWF21-06-002 TrFO ......................................................................................... 49
6.2 Feature Activation Procedure ............................................................................. 50
6.2.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 50
6.2.2 ZWF21-04-005 AMR Rate Controlling................................................................ 50
6.2.3 ZWF21-06-002 TrFO ......................................................................................... 57
6.3 Feature Validation Procedure ............................................................................ 58
6.3.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 58
6.3.2 ZWF21-04-005 AMR Rate Controlling................................................................ 58
6.3.3 ZWF21-06-002 TrFO ......................................................................................... 59
6.4 Feature Deactivation Procedure ......................................................................... 59
6.4.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 59
6.4.2 ZWF21-04-005 AMR Rate Controlling................................................................ 59
6.4.3 ZWF21-06-002 TrFO ......................................................................................... 59
6.5 Impact on the Network ....................................................................................... 59
6.5.1 ZWF21-02-001 Conversational RAB for AMR .................................................... 59
6.5.2 ZWF21-04-005 AMR Rate Controlling................................................................ 60
6.5.3 ZWF21-06-002 TrFO ......................................................................................... 60
7 Abbreviations .................................................................................................. 61
8 Reference Documents ..................................................................................... 61
NB-AMR Rate Control
ZTE Confidential Proprietary 4
FIGURES
Figure 3-1 Signaling Flow of the AMR Service ...................................................................14
Figure 3-2 Flow of OoBTC Out of Band Transcoder Control ..............................................27
Figure 3-3 Iu UP Initialization .............................................................................................28
Figure 3-4 Flow of Iu UP Rate Control ...............................................................................29
Figure 6-1 Parameter Configuration Interface 1 .................................................................50
Figure 6-2 Parameter Configuration Interface 2 .................................................................51
Figure 6-3 Parameter Configuration Interface 3 .................................................................51
Figure 6-4 Parameter Configuration Interface 4 .................................................................52
Figure 6-5 Parameter Configuration Interface 5 .................................................................53
Figure 6-6 Parameter Configuration Interface 6 .................................................................54
Figure 6-7 Parameter Configuration Interface 7 .................................................................54
Figure 6-8 Parameter Configuration Interface 8 .................................................................55
Figure 6-9 Parameter Configuration Interface 9 .................................................................56
Figure 6-10 Parameter Configuration Interface 10 .............................................................56
Figure 6-11 Parameter Configuration Interface 11 .............................................................57
Figure 6-12 Parameter Configuration Interface 12 .............................................................58
TABLES
Table 2-1 NB-AMR Rate Classification ............................................................................... 7
Table 2-2 License Control List ...........................................................................................10
Table 4-1 Parameter Description .......................................................................................30
Table 4-2 Parameter Description .......................................................................................33
Table 4-3 Parameter Description .......................................................................................36
Table 4-4 Parameter Description .......................................................................................43
Table 4-5 Parameter Description .......................................................................................44
NB-AMR Rate Control
ZTE Confidential Proprietary 5
Table 5-1 Counters ............................................................................................................45
Table 6-1 Feature Validation Procedure.............................................................................58
Table 6-2 RNC Parameter .................................................................................................59
NB-AMR Rate Control
ZTE Confidential Proprietary 6
1 Feature Attribute
BSC/RNC version: [ZXUR 9000 UMTS V4.13.10.15/V3.13.10.15]
BTS/Node B version: [ZXSDR V4.13.10.20]
Attribute: [Optional]
Involved NEs:
NE Name Related or Not Special Requirements
MS/UE √ UE should support NB-AMR feature.
BTS/Node B √ None.
BSC/RNC √ RNC should support NB-AMR feature.
iTC - None.
MSC - None.
MGW - None.
SGSN - None.
GGSN - None.
HLR √ The UE subscribes to the NB-AMR service.
“√”: involved
“-”: not involved
2 Overview
2.1 Feature Introduction
The Adaptive Multi-Rate (AMR) codec provides a high-quality voice service with flexible
multi-rate to reach a balance between voice quality and system capability (network load).
Currently, 3GPP uses two formats: Narrowband Adaptive Multi-Rate (NB-AMR) and
Wideband Adaptive Multi-Rate (WB-AMR), and both of them use the same frame length
of 20 ms. For NB-AMR, the voice channel bandwidth is limited to 3.7 kHz and the
sampling frequency is 8,000 Hz. For WB-AMR, the voice channel bandwidth is 7 kHz and
the sampling frequency is 16,000 Hz. The voice quality of WB-AMR is higher than that of
NB-AMR Rate Control
ZTE Confidential Proprietary 7
NB-AMR. If WB-AMR is required, the UE must support it, and whether a UE supports
WB-AMR is indicated in the SETUP uplink direct transfer message from the UE.
AMR Control (AMRC) indicates adjusting AMR between different rates in WCDMA
systems. Through AMRC, voice rate can be reduced to improve voice quality and reduce
system load. AMRC can be used in the following scenarios:
The load at the downlink air interface exceeds the threshold.
The load at the uplink air interface exceeds the threshold.
Uplink coverage is limited and the AMR rate can be reduced to widen uplink
coverage.
When system load is light, AMRC can be used to increase the AMR rate. In this way,
QoS is greatly improved.
The NB-AMR service has three service RAB sub-flows and can provide eight voice rates
and the Silence Descriptor (Comfort Noise Frame). The NB-AMR codec modes related to
UMTS_AMR are shown in the following table.
Table 2-1 NB-AMR Rate Classification
AMR
Codec Mode
Total Number
of Bits
Sub-flow 1 Sub-flow 2 Sub-flow 3
AMR 4.75 kbps 95 42 53 0
AMR 5.15 kbps 103 49 54 0
AMR 5.9 kbps 118 55 63 0
AMR 6.7 kbps
(PDC EFR) 134 58 76 0
AMR 7.4 kbps
(TDMA EFR) 148 61 87 0
AMR 7.95 kbps 159 75 84 0
AMR 10.2 kbps 204 65 99 40
AMR 12.2 kbps
(GSM EFR) 244 81 103 60
AMR SID 39 39 0 0
NB-AMR Rate Control
ZTE Confidential Proprietary 8
AMR
Codec Mode
Total Number
of Bits
Sub-flow 1 Sub-flow 2 Sub-flow 3
(Comfort Noise
Frame)
NB-AMR voice coding is divided into three sub-flows in accordance with the importance
of information and error tolerance in voice coding. Each sub-flow requires its own QoS
assurance. Sub-flow 1 is the most important. Sub-flow 2 comes next. Sub-flow 3 is the
least important. Sub-flow 1 requires better channel coding at the air interface to
guarantee accuracy. The "no data" rate is coded when there is no voice (mute). SID is
used to indicate that voice is not activated currently.
2.1.1 ZWF21-02-001 CS Conversational RAB for AMR Speech
ZTE's equipment supports all the eight NB-AMR rates: 12.2 kbps, 10.2 kbps, 7.95 kbps,
7.4 kbps, 6.7 kbps, 5.9 kbps, 5.15 kbps, and 4.75 kbps, and also supports DTX and SID.
The RAB parameters of ZTE's RAN, used to bear AMR services, are configured in
accordance with 3GPP TS 34.108.
2.1.2 ZWF21-04-005 AMR Rate Controlling
In a WCDMA system, the radio conditions between a UE and the base station always
change. When the UE is far from the base station or the radio conditions are poor, the
base station or the UE must have greater transmit power under the closed-loop power
control to guarantee the QoS of the AMR service. The increase of the power may result
in further deterioration of radio conditions. As a result, system capacity decreases and
the QoS requirements of the service cannot be met even when the power is increased to
the maximum value.
ZTE's RNC can monitor the uplink transmit power contained in the UE internal
measurement report or the downlink transmit power contained in the NodeB-dedicated
measurement report. When the uplink or downlink transmit power rises to a threshold,
the RNC automatically adjusts the UE's NB-AMR rate to reduce the power required for
the service. This indicates that voice quality is reduced to retain calls. When the radio
conditions between a UE and the base station are good and the transmit power of the
NB-AMR Rate Control
ZTE Confidential Proprietary 9
base station or the UE decreases to a threshold, the AMR rate can be increased to
provide the UE with higher voice quality when the system is neither overloaded nor
congested.
In addition, when the downlink and uplink load of a cell is high in accordance with its
downlink transmit power and uplink interference, ZTE's RNC can lighten the cell load by
reducing the NB-AMR rate of some UEs with low priorities so that more UEs can be
supported.
The RNC can only adjust the NB-AMR rates belonging to the NB-AMR code set
configured by the CN for UEs during call establishment. The voice quality when low-rate
AMR coding is used is lower than that when high-rate AMR coding is used but the
capacity (number of UEs) is higher and the coverage is wider. The simulation result
shows that when the lowest NB-AMR (4.75 kbps) is used instead of the highest NB-AMR
(12.2 kbps), the coverage radius gain is about 30% and the UEs supported by the cell
may increase by 100%.
2.1.3 ZWF21-06-002 TrFO
WCDMA systems use AMR compressed voice coding. In the R99 phase, a TDM bearer
is used between CS core network devices, and 64 kbit/s PCM coding must be used for
voice. Voice Transcoder (TC) is an important function of the R99 MSC, converting the
AMR voice codes of mobile terminals into PCM codes and transmits them over the
network. The calls between mobile users require two voice code conversions
(AMR-PCM-AMR). Frequent encoding and decoding reduce voice quality.
Therefore, 3GPP introduced Tandem Free Operation (TFO) and Transcoder Free
Operation (TrFO) in the R4 protocol to avoid voice encoding and decoding. With these
two technologies, the transmission network bandwidth between core networks can be
saved. The differences between the technologies are as follows: TFO needs TC
resources. After a call is established, a direct connection is established between the TCs
of the calling and called MSCs through in-band signaling negotiation to bypass encoding
and decoding. TrFO does not need TC resources. This indicates that Out of Band
Transcoder Control (OoBTC) is used during call establishment to perform consistent
voice encoding and decoding negotiation between the UE and the network.
NB-AMR Rate Control
ZTE Confidential Proprietary 10
The TFO technology is used on core network devices without the RAN. The TrFO
technology requires that the RAN should support out-band voice encoding negotiation
and the processing related to the user plane.
ZTE's RAN supports the TrFO function and complies with 3GPP TS 23.153 and TS
25.415.
2.2 License Control
Table 2-2 License Control List
Feature ID Feature Name License
Control Item
Configured
NE Unit
ZWF21-02-001 CS Conversational
RAB for AMR Speech N/A N/A N/A
ZWF21-04-005 AMR Rate Controlling AMR Rate
Controlling RNC RNC
ZWF21-06-002 TrFO N/A N/A N/A
2.3 Correlation With Other Features
1. Required Features
None.
2. Mutually Exclusive Features
None.
3. Affected Features
None.
NB-AMR Rate Control
ZTE Confidential Proprietary 11
3 Technical Description
3.1 ZWF21-02-001 Conversational RAB for AMR
3.1.1 NB-AMR Rate Selection
The 3GPP specifications define eight voice rates and one SID for UMTS NB-AMR, and
the highest voice rate supported is 12.2 kbps.
3.1.1.1 RAB Assignment
ZTE's RNC determines the NB-AMR rate set according to the value of UP Mode
Versions in the RAB ASSIGNMENT REQUEST message.
If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 1,
the available rates for the service are determined by the intersection of the configured
rate set on the RNC and the received MBR and GBR from the CN. The related
parameters are ULogicalRnc.amrNbMode0UseTag (4.75 kbps),
ULogicalRnc.amrNbMode1UseTag (5.15 kbps), ULogicalRnc.amrNbMode2UseTag (5.9
kbps), ULogicalRnc.amrNbMode3UseTag (6.7 kbps),
ULogicalRnc.amrNbMode4UseTag (7.4 kbps), ULogicalRnc.amrNbMode5UseTag (7.95
kbps), ULogicalRnc.amrNbMode6UseTag (10.2 kbps), and
ULogicalRnc.amrNbMode7UseTag (12.2 kbps), which indicate whether the rates are
supported on the RNC.
If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 2,
the RNC supports all the NB-AMR rates assigned by the CN.
If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 3
and ULogicalRnc.IntraRatV1V2AmrCut is set to cut, the processing on the RNC side is
the same as that when UP Mode Versions is set to 1. If the value of UP Mode Versions
in the RAB ASSIGNMENT REQUEST message is 3 and
ULogicalRnc.IntraRatV1V2AmrCut is set to not cut, the processing on the RNC side is
the same as that when UP Mode Versions is set to 2.
NB-AMR Rate Control
ZTE Confidential Proprietary 12
3.1.1.2 GBR Reservation for the AMR Service
ZTE's RNC can be used to determine whether the GBR should be contained in the
NB-AMR rate set.
When the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message
is 1 or the value of UP Mode Versions is 3 and ULogicalRnc.IntraRatV1V2AmrCut is set
to cut, the NB-AMR rates configured by the RNC may be different from the NB-AMR rate
set assigned by the CN in the RAB ASSIGNMENT REQUEST message. To avoid the
problem that the RNC does not support the GBR in the RAB ASSIGNMENT REQUEST
message, you can set ULogicalRnc.amrGbrResInd to determine that the GBR in the
RAB ASSIGNMENT REQUEST message must be contained in the supported rate set.
If ULogicalRnc.amrGbrResInd is set to 1: True, the actual NB-AMR rate set contains the
intersection of the above two AMR rate sets and the GBR in the RAB ASSIGNMENT
REQUEST message.
If ULogicalRnc.amrGbrResInd is set to 0: False, the actual NB-AMR rate set is the
intersection of the above two AMR rate sets. The GBR used on the RNC is the lowest
rate among the rates (in the NB-AMR rate set) larger than or equal to the GBR in the
RAB ASSIGNMENT REQUEST message.
3.1.2 Combination of the NB-AMR and PS Services
ZTE's RNC supports the NB-AMR service and the combination of the NB-AMR and PS
services.
3.1.3 NB-AMR Mobility
ZTE's RNC supports the soft handover, hard handover, and relocation of the NB-AMR
service, and the handover between the 2G and 3G systems.
3.1.4 Directed Retry of the NB-AMR Service During RAB Assignment
The RNC supports the directed retry of the NB-AMR service during RAB assignment. If
the load of the cell where the UE resides is too heavy during RAB assignment, the UE is
NB-AMR Rate Control
ZTE Confidential Proprietary 13
directed to a 2G system. For details, refer to the ZTE UMTS Directed Retry to GSM
Feature Guide.
3.1.5 AMR Rate Control After Relocation
Due to UE compatibility problems, some UEs become mute if the NB-AMR service rate is
changed after inter-RNC soft handover or hard handover relocation. Therefore,
URncInfo.IntraRlocAmrRtCtrl is used to control whether the NB-AMR service rate can be
changed after the relocation.
If URncInfo.IntraRlocAmrRtCtrl is set to 0: AMR Rate Changing is Allowed after
Relocation or the NB-AMR service rate before relocation is not contained in the
Relocation Request message, or the Iu UP version is V2, the NB-AMR service rate can
be changed after inter-RNC relocation. The methods that determine the NB-AMR service
rate set and the actual NB-AMR service rate after relocation are described in other
sections of this manual.
If URncInfo.IntraRlocAmrRtCtrl is set to 1: AMR Rate Changing is Not Allowed after
Relocation, the NB-AMR service rate before relocation is contained in the Relocation
Request message, and the Iu UP version is V1, the NB-AMR service rate cannot be
changed after inter-RNC relocation. The NB-AMR service rate set only contains the
NB-AMR service rates smaller than or equal to the actual NB-AMR service rate before
relocation, and the actual NB-AMR service rates before and after relocation are the
same.
3.1.6 Default Configuration of NB-AMR Rates: 12.2 kbps, 12.2/7.95/5.9/4.75
kbps, and 7.95 kbps
The RNC supports the default configuration of the following NB-AMR rates: 12.2 kbps,
combinations of 12.2, 7.95, 5.9, and 4.75 kbps, and 7.95 kbps for the handover from the
2G system to the 3G system. The RNC determines the default configuration according to
the MBR and GBR in the Relocation Request message received from the CN,
establishes the bearer according to the default configuration, sets the default cells in the
HANDOVER TO UTRAN COMMAND message, and sends this message to the UE
through the 2G network.
NB-AMR Rate Control
ZTE Confidential Proprietary 14
3.1.7 RAB Modification of NB-AMR
The RNC supports RAB modification for the NB-AMR service that the CN initiates by
sending the RAB ASSIGNMENT REQUEST message. The CN initiates RAB
modification for the NB-AMR service when the TFO or TrFO conditions are satisfied after
handover, call forwarding, and intelligent services.
3.1.8 Signaling Flow of the AMR Service
The following figure shows the establishment flow of the NB-AMR service in synchronous
mode.
Figure 3-1 Signaling Flow of the AMR Service
6. Downlink Synchronisation
7. Uplink Synchronisation
UE Node B
Serving RNS
Serving
RNC
CN
RRC RRC
10. DCCH : Radio Bearer Setup Complete
NBAP NBAP 4. Radio Link Reconfiguration Ready
DCH-FP
NBAP NBAP 8. Radio Link Reconfiguration Commit
RRC RRC
9. DCCH : Radio Bearer Setup
Apply new transport format set
Select L1, L2 and Iu Data
Transport Bearer parameters
RANAP RANAP
11. RAB Assignment
Response
5. ALCAP Iub Data Transport Bearer Setup
2. ALCAP Iu Data
Transport Bearer Setup
Not required towards PS
domain
RANAP RANAP
1. RAB Assignment
Request
[Establishment]
NBAP NBAP 3. Radio Link Reconfiguration Prepare
[DCH Addition]
DCH-FP DCH-FP
DCH-FP
NB-AMR Rate Control
ZTE Confidential Proprietary 15
1 The CN initiates the establishment of a radio access bearer by sending the RANAP
message Radio Access Bearer Assignment Request. The important parameters
for the CS service are as follows:
(Optional) NAS Synchronization Indicator indicates the speech codec type
selected by the CN. The RNC passes this cell to the UE. The codec types related to
UMTS AMR are displayed in the following table. For details, refer to 3GPP 26.103.
If the UE does not receive this cell during the establishment of a voice call or the
inter-system handover of a voice call to the UTRAN, the UMTS_AMR_2 speech
codec is used by default. UMTS_AMR_2 is compatible with GSM FR AMR.
Bit 8…Bit 1
CoID (Codec
Identification)
Codec_Type Name
0000.0101 UMTS Adaptive Multi-Rate UMTS AMR
0000.0110 UMTS Adaptive Multi-Rate
2
UMTS AMR 2
0000.1010 UMTS Adaptive Multi-Rate
Wide Band
UMTS WB-AMR
RAB parameters (including QoS) include the following parameters:
Traffic Class, value: conversational
MBR (Maximum Bit Rate), unit: bit/s
GBR (Guaranteed Bit Rate), unit: bit/s
Delivery Order, value: provide in-sequence SDU delivery (for the AMR
service)
SDU parameters, describing the three RAB sub-flows of the AMR service
Source Statistics Descriptor, value: speech (for the AMR service)
Allocation/Retention Priority
User plane Information parameters:
NB-AMR Rate Control
ZTE Confidential Proprietary 16
User Plane Mode, value: support mode for predefined SDU sizes (for the
AMR service).
UP Mode Versions indicates the user plane version supported by the CN,
containing 16 bits. Each bit indicates a user plane version, and a maximum of
16 user plane versions can be displayed. The highest bit indicates version 16
and the lowest bit indicates version 1. For support mode for predefined SDU
sizes, version 1 and version 2 are defined in the current version (release 99).
Transport layer information parameters include Transport Address and Iu
Transport Association.
2 The SRNC initiates the establishment of the Iu data transport bearer by sending the
ALCAP message. This message contains the AAL2 binding identity, which is used
to bind the Iu data transport bearer to the radio access bearer.
3 The SRNC requests its NodeB to prepare the establishment of DCH to support the
radio access bearer (Radio Link Reconfiguration Prepare). The parameters include
Transport Format Set, Transport Format Combination Set, and power control
information parameters.
4 The NodeB allocates resources and notifies the SRNC that the radio link
reconfiguration is ready (Radio Link Reconfiguration Ready). The parameters
include the transport layer addressing information (AAL2 address and AAL2 Binding
ID) for the Iub data transport bearer.
5 The SRNC initiates the establishment of the Iub data transport bearer by sending
the ALCAP message. This message contains the AAL2 binding identity, which is
used to bind the Iub data transport bearer to DCH.
6 The NodeB and the SRNC use the Iub or Iur data transport bearer to exchange the
DCH frame protocol message Downlink Synchronization to synchronize the Iub or
Iur interface.
7 The NodeB and the SRNC use the Iub or Iur data transport bearer to exchange the
DCH frame protocol message Uplink Synchronization to synchronize the Iub or Iur
interface.
NB-AMR Rate Control
ZTE Confidential Proprietary 17
8 The NBAP message Radio Link Reconfiguration Commit is sent from the SRNC
to the NodeB.
9 The RRC message Radio Bearer Setup is sent from the SRNC to the UE. The
parameters include Transport Format Set and Transport Format Combination
Set.
10 The UE sends the RRC message Radio Access Bearer Setup Complete to the
SRNC.
11 The SRNC sends the RANAP message Radio Access Bearer Assignment
Response to the CN
3.2 ZWF21-04-005 AMR Rate Controlling
3.2.1 Classification of AMR Dynamic Rate Adjustment
The RNC supports dynamic rate adjustment for the AMR service triggered by link-level
transmit power, resource congestion, and load control during calls. If the rate adjustment
threshold is reached, the uplink rate is controlled by the RNC through the TFC control
command, and the downlink rate is controlled by the RNC through the Iu UP reverse rate
control frame.
The NB-AMR dynamic rate adjustment is controlled by the ULogicalRnc.amrRncAdjust
parameter.
There are three types of AMR dynamic rate adjustment depending on the trigger
mechanisms:
NB-AMR dynamic rate adjustment based on link-level transmit power
Due to inner-loop power control, the uplink/downlink link-level transmit power vary with
the change of the radio conditions of the transmitting antennas of the UE and the NodeB.
When the radio conditions degrade, the RNC should reduce the NB-AMR rate to reduce
transmit power to avoid heavy uplink/downlink load of the cell. When the transmit power
of the NB-AMR link is low and the system load is light, the RNC can increase the
NB-AMR Rate Control
ZTE Confidential Proprietary 18
NB-AMR rate to maximize the utilization of system resources to provide users with better
voice quality.
NB-AMR rate adjustment triggered when uplink/downlink resources are congested
or the cell is overloaded
Reduce the rate of the uplink/downlink AMR service to reduce uplink/downlink resource
congestion.
Initial NB-AMR rate adjustment triggered when the cell is overloaded or the UE is a
poorly covered area
When the cell is overloaded or the UE is in a poorly covered area, the initial and the
highest AMR service rates should be reduced to lighten cell load and improve link
performance. For details, refer to the ZTE UMTS Adaptive Radio Bearer Feature Guide.
For these three trigger mechanisms, ZTE's RNC can only adjust the rate of the NB-AMR
service in the range of NB-AMR rates.
3.2.2 AMR Dynamic Rate Adjustment Based on Radio Link Transmit
Power
3.2.2.1 Uplink Rate Adjustment Based on UE Transmit Power
3.2.2.1.1 Measurement Quantity
The AMR rate adjustment in uplink is base on the UE internal measurement reports of
UE TxP (Transmitted Power). There are two kinds of event, Event 6a and Event 6b.
UAmrEvtTPUeInt.meaEvtId defines the UE internal event identity.
Event 6a: when the UE TxP measurement value is greater than a certain absolute
threshold and this condition lasts for the duration TriggerTime6A, the Event 6a is
reported by the UE. TriggerTime6A is defined by the parameter
UAmrEvtTPUeInt.trigTime[0].
Event 6b: when the UE TxP measurement value is smaller than a certain absolute
threshold and this condition lasts for the duration TriggerTime6B, the Event 6b is
NB-AMR Rate Control
ZTE Confidential Proprietary 19
reported by the UE. TriggerTime6B is defined by the parameter
UAmrEvtTPUeInt.trigTime[1].
The parameters for 6a and 6b can be configured at cell level. The number of internal
measurement events is configured by UAmrEvtTPUeInt.measEvtNum. It can be set to
“2”, for Event 6a and 6b. To facilitate the description, it is assumed that 0 represents 6a
and 1 represents 6b.
The UE Txp threshold of Event 6a/6b (UAmrEvtTPUeInt.txPowerThres) is a delta value
relative to maximum UE TX power which is determined by the formula “min (UE
maximum transmitted power determined by UE power class,
USrvDivPc.maxUlDpchPwr)”. USrvDivPc.maxUlDpchPwr is the maximum transmitted
power determined by the sub-service type of NB-AMR service.. And the UE maximum
transmitted power determined by the UE power class is listed as follows.
Power Class 3 4
maximum output power of
the UE (dBm)
+24 +21
The absolute UE TxP thresholds of Event 6a and 6b are as follows.
AMR_6a = maximum UE TX power + UAmrEvtTPUeInt.txPowerThres[0]
AMR_6b = maximum UE TX power + UAmrEvtTPUeInt.txPowerThres[1]
The correspondence between other parameters that need to be filled in UE internal
measurement control message and OMC configuration is described as follows. Firstly
“Used UUeIntMeasProfile” (UUtranCellFDD.refUUeIntMeasProfile) of the cell is obtained
from the management object “UTRAN Cell Object”(UUtranCellFDD). Secondly. from the
value of UUtranCellFDD.refUUeIntMeasProfile, the corresponding profile
ID(UueIntMeasProfile.profileId) of the UUtranCellFDD’s child management object “UE
Internal Measurement Profile Object” (UueIntMeasProfile), which is used by the cell, is
obtained. And thirdly, from the child management object UueIntMeasProfile, which is
identified by the UueIntMeasProfile.profileId, the corresponding UE Internal
Measurement parameter based on the measurement target is obtained.
UE Internal Measurement Configuration Index UAmrEvtTPUeInt.ueIntMCfgNo
Measurement report transmission mode UAmrEvtTPUeInt.measRptTrMod
NB-AMR Rate Control
ZTE Confidential Proprietary 20
UE Internal Measurement Configuration Index UAmrEvtTPUeInt.ueIntMCfgNo
Filter coefficient UAmrEvtTPUeInt.filterCoeff
Maximum Event Number of UE Internal
Measurement UAmrEvtTPUeInt.measEvtNum
UE Internal Measurement Event Identity UAmrEvtTPUeInt.meaEvtId
Time to Trigger UAmrEvtTPUeInt.trigTime
UE Transmitted Power Threshold UAmrEvtTPUeInt.txPowerThres
3.2.2.1.2 Rate Control Principles
If ULogicalRnc.amrRncAdjust is On and the number of uplink NB-AMR rates is larger
than 1, UE TxP measurement is enabled. Otherwise, UE TxP measurement is disabled.
The operating principles are as follows:
If the uplink transmit power reported by the UE exceeds the threshold (AMR_6a)
and the current uplink NB-AMR rate is not the lowest rate, the NB-AMR rate level
must be reduced by one. After the uplink NB-AMR rate level is reduced, a new
measurement control command is sent to the UE.
If the uplink transmit power reported by the UE is lower than the threshold
(AMR_6b), the current uplink NB-AMR rate is not the highest rate, and the system is
neither overloaded nor congested with uplink load, the NB-AMR rate level must be
increased by one. After the uplink NB-AMR rate level is increased, a new
measurement control command is sent to the UE.
For TrFO connection mode, the following operations must be also performed:
If the target NB-AMR rate is smaller than or equal to the highest uplink rate of the Iu
interface, the rate can be increased. Otherwise, the uplink rate cannot be increased.
When the RNC receives the rate control command from the CN, the highest rate is the
uplink target rate required by the CN. The RNC determines whether the target rate can
be adjusted by the current RNC according to cell uplink load and the UE transmit power
measurement report. If the target rate can be adjusted by the RNC, the RNC returns the
rate control response command containing the rate to the peer end. At the same time,
the RNC sends the TFC control command to the UE, requiring that the UE uplink rate
NB-AMR Rate Control
ZTE Confidential Proprietary 21
should be adjusted to the target rate. If the target rate cannot be adjusted by the RNC,
the RNC sends a Rate Control NACK message to the CN.
3.2.2.2 Downlink Rate Adjustment Based on the Dedicated Measurement of Node
B Transmit Power
3.2.2.2.1 Measurement Quantity
The downlink NB-AMR rate adjustment is based on the D-TCP (Dedicated Transmitted
Code Power) measurement report from Node B. It indicates that the downlink transmitted
power for the UE (the TCP on the given carrier, given scramble, and given channelization
code) is measured by the Node B. The Node B dedicated TCP measurement for the
NB-AMR rate control is reported periodically and the period is configured by
UNbDedMeas.RptPrd. Whether the criterion for Event A or Event B is met is determined
by the RNC. Event A and Event B are defined as follows:
Event A: when the Node B D-TCP measurement value is greater than a specific
absolute threshold AMR_A for the duration TriggertimeA, the Event A is triggered.
When the criterion of Event A is met, the downlink transmitted power for a certain
UE is considered to be in a high power status, and the downlink rate could be
decreased.
Event B: when the Node B D-TCP measurement value is smaller than a specific
absolute threshold AMR_B for the duration TriggertimeB , the Event B is triggered.
When the criterion of Event B is satisfied, the downlink transmitted power for a
certain UE is considered to be in a low power status, and the downlink rate could be
increased.
The definition of AMR_A and AMR_B are as followed.
AMR_A = USrvDivPc.maxDlDpchPwr + evtAbTcpThrd_A
AMR_B = USrvDivPc.maxDlDpchPwr + evtAbTcpThrd_B
Where
NB-AMR Rate Control
ZTE Confidential Proprietary 22
- USrvDivPc.maxDlDpchPwr is the maximum downlink DPCH transmitted power for
NB-AMR service. The detailed description refers to ZTE UMTS Power Control
Feature Guide.
- evtAbTcpThrd_A is defined by the parameter UNbDedMeas.evtAbTcpThrd[0]
indexed by UNbDedMeas.nbDMCfgNote =7
- evtAbTcpThrd_B is defined by the parameter UNbDedMeas.evtAbTcpThrd[0]
indexed by UNbDedMeas.nbDMCfgNote =8
The correspondence between other parameters that need to be filled in dedicated
measurement initiation request message and OMC configuration is described as follows.
Firstly the Profile Id for the NodeB dedicated measurement
(UNbDedMeasProfile.profileId) of the cell is obtained from the management object
“UNbDedMeasProfile”. Secondly, from the value of UNbDedMeasProfile.profileId, the
corresponding child management object “NodeB Dedicated Measurement
Configuration”(UnbDedMeas) is found. Thirdly, The corresponding
UNbDedMeas.nbDMCfgNote could be obtained according to the measurement purpose.
And finally the parameters for the measurment are obtained according to the value of
UNbDedMeas.nbDMCfgNote.
Dedicated Measurement Type UNbDedMeas.dedMeasType
Measurement Filter Coefficient UNbDedMeas.measFilterCoeff
Report Characteristics UNbDedMeas.rptType
Measurement Threshold of Event A/B for
Transmitted Code Power UNbDedMeas.evtAbTcpThrd
Measurement Change Time/Measurement
Hysteresis Time UNbDedMeas.evtAbcdefTime
Choice Report Periodicity Scale UNbDedMeas.rptPrdUnit
Report Period UNbDedMeas.rptPrd
DPCH Maximum DL Power USrvDivPc.maxDlDpchPwr
Event A Counter Threshold for PS on DL
DCH or DL AMR Decreasing Rate Based on
D-TCP UDrbc.dtcpEaThd
Event B Counter Threshold for Restriction PS
Increasing Rate on DL DCH or Triggering DL
AMR Increasing Rate Based on D-TCP UDrbc.dtcpEbThd
NB-AMR Rate Control
ZTE Confidential Proprietary 23
3.2.2.2.2 Rate Control Principles
If ULogicalRnc.amrRncAdjust is On and the number of downlink NB-AMR rates is larger
than 1, DTCP measurement is enabled. Otherwise, NodeB-dedicated TCP measurement
is disabled.
The basic principles are as follows:
When the special downlink transmit power reported by the NodeB exceeds the
threshold (AMR_A) UDrbc.dtcpEaThd times consecutively and the current downlink
NB-AMR rate is not the lowest rate, the downlink NB-AMR rate level must be
reduced by one.
When the special downlink transmit power reported by the NodeB is lower than the
threshold (AMR_B) UDrbc.dtcpEbThd times consecutively, the current downlink
NB-AMR rate is not the highest rate, and the system is neither overloaded nor
congested with downlink load, the downlink NB-AMR rate level must be increased
by one.
For TrFO connection mode, the downlink rate depends on the downlink rate of the Iu
interface. In a mobile-to-mobile call, the downlink rate depends on the uplink rate of the
peer end. Therefore, the downlink NB-AMR rate adjustment algorithm is changed as
follows in comparison with the non-TrFO connection mode:
When the local end needs to adjust the downlink NB-AMR rate, the RNC sends the
adjusted target rate through the rate control command to the CN, and the CN sends
this rate through the rate control command to the peer RNC. The returned rate
control response command contains the highest uplink rate supported by the peer
end. The peer UE sends data at the smaller rate between the highest uplink rate
supported by the peer end and the target rate required by the local end. In this way,
the downlink rate of the local end is adjusted.
When the uplink rate of the peer end is reduced, the downlink rate of the local end is
reduced accordingly.
When the uplink rate of the peer end is increased, the downlink rate of the local end
is increased accordingly, resulting in the change of the downlink load of the cell and
the downlink D-TCP of the link. The RNC should determine whether to reduce the
NB-AMR Rate Control
ZTE Confidential Proprietary 24
increasing downlink rate according to the downlink load of the cell and the downlink
D-TCP measurement report. If the downlink rate must be reduced, the RNC sends
the rate control command to the CN, containing the highest rate supported by the
local end. In this way, the downlink rate of the Iu interface is controlled.
3.2.3 Dynamic Adjustment Triggered by Load
In case of uplink or downlink overload in a cell, the RNC must reduce the rates of AMR
services in accordance with their priorities.
When the cell is not overloaded and the NB-AMR services whose rates are reduced
meet the conditions described in section 3.3.2 Iu UP Initialization, the RNC increases
their rates level by level.
When the switch of forbidding AMR downgrade is turned on (URncInfo.loadForAmrSwit
is 1: forbidden), the AMR downgrade triggered by load control is not performed. If
URncInfo.loadForAmrSwit is 0, the original load control downgrade policy is recovered.
For details, refer to the ZTE UMTS Overload Control Feature Guide.
3.2.4 Dynamic Adjustment Triggered by Resource Congestion
In case of uplink or downlink resource congestion, the RNC must reduce the rates of
AMR services in accordance with their priorities.
When uplink or downlink resources are not congested and the NB-AMR services whose
rates are reduced meet the conditions described in section 3.3.2 Iu UP Initialization, the
RNC increases their rates level by level.
When the switch of forbidding AMR downgrade is turned on (URncInfo.loadForAmrSwit
is 1: forbidden), the AMR downgrade triggered by congestion control is not performed. If
URncInfo.loadForAmrSwit is 0, the original congestion control downgrade policy is
recovered. For details, refer to the ZTE UMTS Congestion Control Feature Guide.
NB-AMR Rate Control
ZTE Confidential Proprietary 25
3.3 ZWF21-06-002 TrFO
In the R99 phase, 64 kbit/s PCM coding is used based on the TDM bearer in the CN CS
domain. Therefore, the R99 MSC must have the voice TC function. However, voice
quality may be reduced after encoding or decoding. The calls between mobile users
need dual voice encoding and decoding. If no codec is used, voice quality can be
improved and network bandwidth can be saved.
In the R4 phase, a TrFO connection can reduce the number of times that voice encoding
and decoding are performed. The TrFO connection can be established throughout the
end-to-end process or between the nodes of a call connection. For example, for a call
between a UMTS UE and a fixed telephone, the TrFO connection only exists between
the UMTS UE and the core network. The core network and the RNC in the TrFO
connection must support Iu UP V2. Otherwise, no TrFO connection can be established.
ZTE supports both Iu UP V1 and Iu UP V2, and the RNC is selected according to CN
RAB assignment parameters.
The TrFO is implemented through Out of Band Transcoder Control (OoBTC). It is
applicable to the calls between mobile networks and those between a mobile network
and an external network. When the same voice encoding or decoding type is used
between both call parties or between one call party and a node in the call connection, the
TrFO can transparently transmit the compressed voice, and this improves voice quality
and saves transmission bandwidth.
The nodes connected with a TrFO connection use the same common compressed voice
encoding type negotiated in the OoBTC phase. A codec must be inserted between a
TrFO connection and a non-TrFO connection to convert encoding types. The
implementation strategy of the core network ensures that the insertion position can meet
the following requirements:
The insertion position should reduce the number of times that TC (transcoder) is
used and improve voice quality;
The insertion position should save transmission bandwidth. This indicates that it
should prolong the connection that uses compressed voice encoding data for
transmission.
NB-AMR Rate Control
ZTE Confidential Proprietary 26
During Iu UP initialization, if the CN supports both Iu UP version 1 and version 2, ZTE's
RNC uses URncFunction.intraRatV1V2AmrCut to determine whether to cut NB-AMR
rates according to the RNC capability between the CN and the RNC in the RAB
assignment procedure and inter-RNC relocation procedure, and ZTE's RNC uses
URncFunction.interRatV1V2AmrCut to determine whether to cut NB-AMR rates
according to the RNC capability between the CN and the RNC in the inter-RAT relocation
procedure.
For a UTRAN, its Iu UP initialization, reverse initialization, Iu UP rate control, and Iu UP
reverse rate control are related to the TrFO process.
3.3.1 OoBTC Out of Band Transcoder Control
When a call is initiated, both call parties negotiate the codec to establish a TrFO
operation. The O-MSC sends an IAM message containing the supported codec type list
to a transmission network. The transmission network deletes the codec types that are not
supported from the list and sends it to a T-MSC. The T-MSC also deletes the codec
types that are not supported from the list and then selects an optimal common codec
type. The T-MSC returns the codec type to the transmission network and the O-MSC,
and notifies them of the selected codec type. In the meantime, the T-MSC returns the
codec type that the Terminating UE supports to the O-MSC and begins to establish a
bearer based on this codec. This flow is shown in the following figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 27
Figure 3-2 Flow of OoBTC Out of Band Transcoder Control
Codec List (v, w, x, y, z)
Codec List (v, w, x, z)
O-MSC Transit T-MSC
O-MGW T-MGWTransit
MGW
Selected Codec = v, Available List (v, x, z, )
Selected Codec = v
Selected Codec = v
Selected Codec = v, Available
List (v, x, z, )
Selected Codec = v
Bearer Established Bearer Established
The encoding type that the UE supports is transparently transmitted to the RNC as
follows: Uplink Direct Transfer -> NAS Message -> Bearer Capacity, and then the RNC
transparently transmits the encoding type to the MSC server as follows: Direct Transfer ->
NAS Indicator -> Bearer Capacity. During RAB assignment, the encoding/decoding type
lists of the calling and called parties are completely the same.
3.3.2 Iu UP Initialization
The purpose of Iu UP initialization is to define the mapping relationship (used in the data
transmission phase) between the RNC and the CN on both sides of Iu UP, including RAB
sub-flow combination, RFCIs, and SDU size of the related RAB sub-flow.
If a bearer is successfully established, the CN delivers an RAB assignment request
message to the RNC. The RNC in the R4 version must support all the SDU sub-flow
combinations in the RAB assignment request message. This indicates that the content in
the initialization frame is a universal set of sub-flow combinations determined by RAB
assignment. Therefore, the initialization frame is only used to negotiate Iu UP version
NB-AMR Rate Control
ZTE Confidential Proprietary 28
information and RFCI correspondence (each RFCI corresponds to a sub-flow
combination).
In the R99 version, this initialization process can only be performed when the RNC
receives an RAB assignment, modification, or RNC relocation request. In the R4 version,
the CN can also perform this initialization process, which is called Iu UP reverse
initialization. The following figure shows Iu UP initialization.
Figure 3-3 Iu UP Initialization
*
Transfer Of User Data
CN/ RNC
INITIALISATION
((RFCI, SDU sizes[, IPTIs 2) ]) m )
INITIALISATION ACK
* can be repeated N INIT times 2) optional
RNC/ CN
In the RFCI set determined during Iu UP initialization, the rate that corresponds to the
first RAB sub-flow combination is the highest rate in the initialization response direction
permitted by the local end when data transmission begins. The highest rate must be
higher than the guaranteed rate and SID rate. The highest rate can be modified during Iu
UP rate control after Iu UP initialization. The rates higher than the guaranteed rate are
called controllable rates, and the rates lower than the guaranteed rate cannot be
modified.
3.3.3 Iu UP Rate Control
The purpose of Iu UP rate control is to notify the peer Iu UP protocol layer of the highest
rate at the Iu interface in the reverse direction of the rate control frame. In the R4 version,
Iu UP rate control can be initiated by the RNC or the CN. In the R99 version, Iu UP rate
control can only be initiated by the RNC.
As long as an Iu UP entity is not suspended by other control flows, it can initiate rate
control. The controlled rates are all included in the RFC set determined during Iu UP
initialization. These rates that correspond to the RFC should be higher than the
NB-AMR Rate Control
ZTE Confidential Proprietary 29
guaranteed rate. Rate control cannot be implemented when the SID rate and the RFC
are lower than the guaranteed rate because they cannot be prohibited.
Figure 3-4 Flow of Iu UP Rate Control
CN/ RNC
RNC/ CN
RATE CONTROL
(RFCI indicators)
RATE CONTROL ACK
(RFCI indicators)
Note: The rate control frame describes the limits of an RFC set, hereinafter called the
"RFC limit set".
In downlink direction, the RNC triggers the rate control frame, records the "RFC limit set"
(downlink direction), and monitors the operations of the CN. If the CN sends the data
frame of the limited RFCI, the rate control frame must be resent. In uplink direction, the Iu
UP module of the RNC receives the rate control frame and implements the limit through
TFC control.
The rate control initiated by the CN is as follows: After receiving a rate control message
from the RNC, the CN initiates rate control to the other party of the call to limit or open the
other party's uplink AMR level, or the CN initiates a rate adjustment flow according to the
TrFO. For example, during SRNS relocation, the CN performs reverse initialization first
after a new RNC sends relocation detection to the CN, and then the new RNC initiates a
process called immediate initialization. This aims at negotiating the highest rate for data
transmission between two Iu UP entities supporting TrFO.
The rate control initiated by the RNC is as follows: During the dynamic AMR process, the
RNC adjusts the downlink AMR level according the downlink load of a cell or the
dedicated TCP measurement of an RL and initiates rate control.
Compared with the encoding and decoding type negotiation before initialization, Iu UP
rate control is in-band rate control.
NB-AMR Rate Control
ZTE Confidential Proprietary 30
4 Parameters
4.1 ZWF21-02-001 Conversational RAB for AMR
Table 4-1 Parameter Description
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
ULogicalRnc.a
mrNbMode0Us
eTag
AMR_NB
4.75k Use Tag
This parameter
indicates whether the
RNC supports AMR
4.75 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0:Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode1Us
eTag
AMR_NB
5.15k Use Tag
This parameter
indicates whether the
RNC supports AMR
5.15 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0: Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode2Us
eTag
AMR_NB
5.90k Use Tag
This parameter
indicates whether the
RNC supports AMR
5.90 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0: Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode3Us
AMR_NB
6.70k Use Tag
This parameter
indicates whether the
0: Not
Used N/A
0:Not
Used
0:Not
Used
NB-AMR Rate Control
ZTE Confidential Proprietary 31
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
eTag RNC supports AMR
6.70 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
1: Used
ULogicalRnc.a
mrNbMode4Us
eTag
AMR_NB
7.40k Use Tag
This parameter
indicates whether the
RNC supports AMR
7.40 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0: Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode5Us
eTag
AMR_NB
7.95k Use Tag
This parameter
indicates whether the
RNC supports AMR
7.95 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0: Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode6Us
eTag
AMR_NB
10.2k Use Tag
This parameter
indicates whether the
RNC supports AMR
10.2 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
0: Not
Used
1: Used
N/A 0:Not
Used
0:Not
Used
ULogicalRnc.a
mrNbMode7Us
eTag
AMR_NB
12.2k Use Tag
This parameter
indicates whether the
RNC supports AMR
0: Not
Used
1: Used
N/A 1:Used 1:Used
NB-AMR Rate Control
ZTE Confidential Proprietary 32
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
12.2 kbps in Iu UP
version 1. It is used in
the user plane
initialization process of
RAB establishment or
SRNS relocation.
URncFunction.
amrGbrResInd
GBR of AMR
Service
Whether to be
Reserved
Indicator
This parameter
indicates whether the
GBR rate assigned by
the CN is forcibly
reserved in Iu UP V1
mode, when the GBR
rate assigned by the CN
does not match the
AMR rate configured by
RNC.
0: False
1: True N/A 1 1
URncInfo.Intra
RlocAmrRtCtrl
AMR Rate
Control Switch
after
Relocation
The parameter is used
to indicates whether
narrowband or
wideband AMR service
rate is allowed to be
changed after the
relocation or not. "0"
indicates rate changing
after relocation is not
allowed. while "1"
indicates rate changing
after relocation is
allowed.
0: AMR
Rate
Changi
ng is
Allowed
after
Relocati
on
1: AMR
Rate
Changi
ng is
Not
Allowed
after
Relocati
on
N/A
0: AMR
Rate
Changi
ng is
Allowed
after
Relocat
ion
0: AMR
Rate
Changi
ng is
Allowed
after
Relocat
ion
URncFunction.
interRatV1V2A
mrCut
Inter-RAT
V1+V2 Amr
Cut Decision
Specifies the Amr cut
decision when IuUP
version including
V1+V2 in the inter-RAT
1: cut
2: not
cut
N/A 1: cut 1: cut
NB-AMR Rate Control
ZTE Confidential Proprietary 33
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
case
URncFunction.
intraRatV1V2A
mrCut
Intra-RAT
V1+V2 Amr
Cut Decision
Specifies the Amr cut
decision when IuUP
version including
V1+V2 in the intra-RAT
case
1: cut
2: not
cut
N/A 2: not
cut
2: not
cut
4.2 ZWF21-04-005 AMR Rate Controlling
4.2.1 Uplink Rate Adjustment Based on the UE Transmitted Power
Table 4-2 Parameter Description
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
ULogicalRnc.a
mrRncAdjust
AMR Rate
Adjustment
Switch for
RNC
This parameter
indicates whether AMR
rate adjustment is
supported in the RNC.
0: Off
1: On N/A 0:Off 1:On
UUtranCellFD
D.refUUeIntMe
asProfile
Used UE
Internal
Measurement
Profile
This parameter is the
DN (Distinguish Name)
of UUeIntMeasProfile.
0..6553
5, step
1
N/A N/A N/A
UUeIntMeasPr
ofile.profileId Profile Id
ID of UE internal
measurement Profile
0..9,
step 1 NA NA N/A
UAmrEvtTPUe
Int.ueIntMCfgN
o
UE Internal
Measurement
Configuration
Index
This parameter is used
for indexing the
configuration of the
parameters of UE
transmitted power event
report for AMR
dyanamical rate control.
0..6553
5, step
1
long N/A N/A
UAmrEvtTPUe Measurement This parameter 0: N/A 0:Ackn 0:Ackn
NB-AMR Rate Control
ZTE Confidential Proprietary 34
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
Int.measRptTr
Mod
Report
Transfer Mode
indicates the RLC mode
of the UE internal
measurement report. If
the value is AM RLC,
RNC can request UE for
retransmission after
receiving the error SDU
label (not continuous). If
the value is UM RLC,
the retransmission is
not required. Usually,
report the results of the
important
measurements in AM
mode and those less
important in UM mode
(to reduce the traffic
volume of the
measurement report
and increase the
system capacity).
Acknow
ledged
Mode
RLC
1:
Unackn
owledg
ed
Mode
RLC
owledg
ed
Mode
RLC
owledg
ed
Mode
RLC
UAmrEvtTPUe
Int.filterCoeff
Filter
Coefficient
This parameter
indicates the filtering
factor that UE performs
the L3 filtering on the
measurement results of
the internal
measurement.
(0, 1,
2, 3, 4,
5, 6, 7,
8, 9, 11,
13, 15,
17, 19)
N/A 3 3
UAmrEvtTPUe
Int.measEvtNu
m
Maximum
Event Number
of UE Internal
Measurement
This parameter
indicates the maximum
event number of UE
internal measurement.
1..7,
step 1 N/A 2 2
UAmrEvtTPUe
Int.meaEvtId
UE Internal
Measurement
Event Identity
This parameter
indicates the UE
internal measurement
event identity.
[6a, 6b,
6f, 6g] N/A [6a, 6b] [6a, 6b]
UAmrEvtTPUe Time to Trigger This parameter (0, 10, ms [1280, [1280,
NB-AMR Rate Control
ZTE Confidential Proprietary 35
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
Int.trigTime indicates the period of
time during which the
event condition has to
be satisfied before
sending a measurement
report.
20, 40,
60, 80,
100,
120,
160,
200,
240,
320,
640,
1280,
2560,
5000)m
s
1280] 1280]
UAmrEvtTPUe
Int.txPowerThr
es
UE
Transmitted
Power
Threshold
This parameter
indicates the UE
transmitted power
threshold in event
6a/6b.
(-50,
0)dB,
step1
dB
dB [-1, -2] [-1, -2]
USrvDivPc.ma
xUlDpchPwr
Maximum
Allowed Uplink
DPCH
Transmission
Power
This parameter
indicates the maximum
DPCH uplink transmit
power allowed for a UE.
When uplink inner loop
power control is
performed, the transmit
power newly calculated
by a UE may be larger
than this parameter. In
this case, the UE can
only use this parameter
for transmitting signals.
This parameter is a
nine-element array.
These elements are
used in different load
conditions and user
priorities. The
corresponding
(-50..33
)dBm,
step
1dBm
dBm
[33,33,
33,33,3
3,33,33
,33,33]
[33,33,
33,33,3
3,33,33
,33,33]
NB-AMR Rate Control
ZTE Confidential Proprietary 36
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
relationships of the
elements and load
levels and user
priorities are as follows:
Element 1: low load,
gold medal user
Element 2: low load,
silver medal user
Element 3: low load,
bronze medal user
Element 4: medium
load, gold medal user
Element 5: medium
load, silver medal user
Element 6: medium
load, bronze user
Element 7: high load,
gold medal user
Element 8: high load,
silver medal user
Element 9: high load,
bronze medal user
4.2.2 Downlink Rate Adjustment Based on the Dedicated Measurement of
Node B Transmitted Power
Table 4-3 Parameter Description
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
ULogicalR
nc.amrRnc
Adjust
AMR Rate
Adjustment
Switch for
RNC
This parameter indicates
whether AMR rate
adjustment is supported
in the RNC.
0: Off
1: On N/A 0:Off 1:On
UNbDedM Profile Id This parameter indicates 0..9 NA NA N/A
NB-AMR Rate Control
ZTE Confidential Proprietary 37
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
easProfile.
profileId
the Profile Id for the
NodeB dedicated
measurement. Each
profile corresponds one
setting of NodeB
dedicated measurement
parameters.
UNbDedM
eas.nbDM
CfgNote
Function of
Configuration
Parameters
This parameter indicates
the function, purpose
etc. of the dedicated
measurement
parameters indicated by
the configuration index.
0: Period
Report
Parameters for
TCP in Power
Balance
1: Period
Report
Parameters for
TCP in AMR or
DASF-PS or
Handover
Control
2: Event A
Report
Parameters for
TCP in
DASF-PS
3: Event B
Report
Parameters for
TCP in
DASF-PS
4: Period
Report
Parameters for
RTT in LCS
5: Event E
Report
Parameters for
SIR Error in
N/A
7: Event
A Report
Paramet
ers for
TCP in
AMR
8: Event
B Report
Paramet
ers for
TCP in
AMR
7:
Event
A
Report
Param
eters
for
TCP in
AMR
8:
Event
B
Report
Param
eters
for
TCP in
AMR
NB-AMR Rate Control
ZTE Confidential Proprietary 38
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
Outer Loop
Power Control
6: Event F
Report
Parameters for
SIR Error in
Outer Loop
Power Control
7: Event A
Report
Parameters for
TCP in AMR
8: Event B
Report
Parameters for
TCP in AMR
9: Event A
Report
Parameters for
TCP in
Handover
Control
10: Event B
Report
Parameters for
TCP in
Handover
Control
UNbDedM
eas.dedM
easType
Dedicated
Measurement
Type
This parameter indicates
the type of dedicated
measurement to be
executed by Node B
1: SIR Error
2: Transmitted
Code Power
5: Round Trip
Time
N/A
2:
Transmit
ted Code
Power
2:
Trans
mitted
Code
Power
UNbDedM
eas.meas
FilterCoeff
Measurement
Filter
Coefficient
This parameter indicates
how filtering of the
measurement values
shall be performed
( 0, 1, 2, 3, 4,
5, 6, 7, 8, 9,
11, 13, 15, 17,
N/A 2 2
NB-AMR Rate Control
ZTE Confidential Proprietary 39
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
before measurement
event evaluation and
reporting.
The averaging shall be
performed according to
the following formula.
F(n) =(1-a)* F(n-1) +
a*M(n)
The variables in the
formula are defined as
follows:
F(n) is the updated
filtered measurement
result
F(n-1) is the old filtered
measurement result
Mn is the latest received
measurement result from
physical layer
measurements
a = (1/2)^ (k/2) , where k
is the Measurement
Filter Coefficient. If k=1
there’s no filtering)
In order to initialise the
averaging filter, F(0) is
set to M(1) when the first
measurement result from
the physical layer
measurement is
received.
19)
UNbDedM
eas.rptTyp
e
Report
Characteristic
s
This parameter indicates
the report characteristics
of measurement results,
which can be on
demand, periodic or by
triggering all kinds of:
1: On Demand
2: Periodic
3: Event A
4: Event B
5: Event C
6: Event D
N/A 2:
Periodic
2:
Period
ic
NB-AMR Rate Control
ZTE Confidential Proprietary 40
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
events. 7: Event E
8: Event F
UNbDedM
eas.evtAb
TcpThrd
Measurement
Threshold of
Event A/B for
Transmitted
Code Power
This parameter indicates
the power offset of the
DPCH maximum DL
power, which defines
which threshold that
shall trigger event A, B
for transmitted carrier
power measurement.
In PS DRBC, this
threshold is related to
the service rate as
following:
Rate Level PS Service
Rate (R) Threshold of
Event A/B
Level 1 R<=
DlRateLevel[0]
EvtAbTcpThrd [0]
Level 2
DlRateLevel[0]<R<=
DlRateLevel[1]
EvtAbTcpThrd [1]
Level 3
R>DlRateLevel[1]
EvtAbTcpThrd [2]
Other case, the
threshold and service
rate independent, and
the threshold is
EvtAbTcpThrd [0].
(-50..0)dB,
step 0.1dB dB
[-0.4,-1.6
]
[-0.4,-
1.6]
UNbDedM
eas.evtAb
cdefTime
Measurement
Change
Time/Measur
ement
For event A/B/E/F, this
parameter is
measurement hysteresis
time and the
(10..60000)ms,
step 10ms
ms 100 100
NB-AMR Rate Control
ZTE Confidential Proprietary 41
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
Hysteresis
Time
measurement hysteresis
time provides the
duration during which a
reporting criterion has to
be fulfilled for the
Measurement Reporting
procedure to be
triggered.
For event C/D, this
parameter is change
time. and the change
time is the time the
measurement entity shall
rise on (in ms), in order
to trigger a measurement
report.
UNbDedM
eas.rptPrd
Unit
Choice
Report
Periodicity
Scale
This parameter indicates
the report period unit
applied by Node B for
measurement result
reporting.
1: ms
2: min N/A ms ms
UNbDedM
eas.rptPrd Report Period
This parameter indicates
the frequency of
measurement report
transmitted by Node B.
RptPrdUnit =1:
(10..60000)ms,
step 10ms
RptPrdUnit =2:
(1..60)min step
min
ms 1000 1000
USrvDivPc
.maxDlDpc
hPwr
DPCH
Maximum DL
Power
This parameter indicates
the maximum DPCH
downlink transmit power.
When downlink inner
loop power control is
performed, new transmit
power must be smaller
than or equal to the
configured DPCH
(-35..15)dB,
step 0.1dB dB
[3,3,3,3,
0,0,3,0,0
]
[3,3,3,
3,0,0,
3,0,0]
NB-AMR Rate Control
ZTE Confidential Proprietary 42
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
Maximum DL Power. If
the newly calculated
transmit power is larger
than the configured
DPCH Maximum DL
Power, set it to be equal
to the configured DPCH
Maximum DL Power.
This parameter is a
nine-element array.
These elements are
used in different load
conditions and user
priorities. The
corresponding
relationships of the
elements and load levels
and user priorities are as
follows:
Element 1: low load, gold
medal user
Element 2: low load,
silver medal user
Element 3: low load,
bronze medal user
Element 4: medium load,
gold medal user
Element 5: medium load,
silver medal user
Element 6: medium load,
bronze user
Element 7: high load,
gold medal user
Element 8: high load,
silver medal user
Element 9: high load,
bronze medal user
NB-AMR Rate Control
ZTE Confidential Proprietary 43
Parameter
Name GUI Name Parameter Description Value Range Unit
Default
Value
Reco
mmen
ded
Value
UDrbc.dtc
pEaThd
Event A
Counter
Threshold for
PS on DL
DCH or DL
AMR
Decreasing
Rate Based
on D-TCP
This parameter indicates
the reported times of
threshold of DTCP
measurement event A. If
the times of the event A
that only uses TCP is
larger than this
threshold, the speed of
downlink PS or AMR will
be reduced.
1..255 N/A 2 2
UDrbc.dtcp
EbThd
Event B
Counter
Threshold for
Restriction
PS
Increasing
Rate on DL
DCH or
Triggering DL
AMR
Increasing
Rate Based
on D-TCP
This parameter indicates
the event B counter
threshold of consecutive
DTCP reports. If the
times of dedicated
transmitted code power
is less than the event B
threshold exceed the
threshold indicated by
this parameter, it will
trigger the downlink AMR
increasing rate or allow
PS services to increase
rate on DL DCH based
on traffic volume report.
1..255 N/A 2 2
4.2.3 Dynamic Adjustment Triggered by Load and Resource Congestion
Table 4-4 Parameter Description
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
URncInfo.conF
orbAmrSwit
Switch of
Forbidding
AMR
This parameter is the
switch of forbidding
AMR deceleration
0: not
forbidde
n
N/A
0: not
forbidd
en
0: not
forbidd
en
NB-AMR Rate Control
ZTE Confidential Proprietary 44
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
Deceleration
Triggered by
Congestion
Control
triggered by congestion
control. When the
switch is on, AMR
speed is forbidden even
resource is congested.
1:
forbidde
n
URncInfo.load
ForAmrSwit
Switch of
Forbidding
AMR
Deceleration
Triggered by
Overload
Control
This parameter is the
switch of forbidding
AMR deceleration
triggered by overload
control. When the
switch is on, AMR
speed is forbidden even
resource is overload.
0: not
forbidde
n
1:
forbidde
n
N/A
0: not
forbidd
en
0: not
forbidd
en
4.3 ZWF21-06-002 TrFO
Table 4-5 Parameter Description
Parameter
Name GUI Name Parameter Description
Value
Range Unit
Default
Value
Recom
mende
d Value
URncFunction.
interRatV1V2A
mrCut
Inter-RAT
V1+V2 Amr
Cut Decision
Specifies the Amr cut
decision when IuUP
version including
V1+V2 in the inter-RAT
case
1: cut
2: not
cut
N/A 1: cut 1: cut
URncFunction.
intraRatV1V2A
mrCut
Intra-RAT
V1+V2 Amr
Cut Decision
Specifies the Amr cut
decision when IuUP
version including
V1+V2 in the intra-RAT
case
1: cut
2: not
cut
N/A 2: not
cut
2: not
cut
NB-AMR Rate Control
ZTE Confidential Proprietary 45
5 Related Counters and Alarms
5.1 Related Counters
Table 5-1 Counters
Counter ID Name
C310030466 Number of CS AMR 12.2k in the best cell
C310030467 Number of CS AMR 10.2k in the best cell
C310030468 Number of CS AMR 7.95k in the best cell
C310030469 Number of CS AMR 7.4k in the best cell
C310030470 Number of CS AMR 6.7k in the best cell
C310030471 Number of CS AMR 5.9k in the best cell
C310030472 Number of CS AMR 5.15k in the best cell
C310030473 Number of CS AMR 4.75k in the best cell
C310030638 Number of CS AMR 12.2k in the non-best cell
C310030639 Number of CS AMR 10.2k in the non-best cell
C310030640 Number of CS AMR 7.95k in the non-best cell
C310030641 Number of CS AMR 7.4k in the non-best cell
C310030642 Number of CS AMR 6.7k in the non-best cell
C310030643 Number of CS AMR 5.9k in the non-best cell
C310030644 Number of CS AMR 5.15k in the non-best cell
C310030645 Number of CS AMR 4.75k in the non-best cell
C310063411 Number of CS AMR 12.2k in the DRNC cell
C310063412 Number of CS AMR 10.2k in the DRNC cell
C310063413 Number of CS AMR 7.95k in the DRNC cell
C310063414 Number of CS AMR 7.4k in the DRNC cell
C310063415 Number of CS AMR 6.7k in the DRNC cell
C310063416 Number of CS AMR 5.9k in the DRNC cell
C310063417 Number of CS AMR 5.15k in the DRNC cell
C310063418 Number of CS AMR 4.75k in the DRNC cell
NB-AMR Rate Control
ZTE Confidential Proprietary 46
C310040001 Holding time for the best cell,AMR12.2
C310040002 Holding time for the best cell,AMR10.2
C310040003 Holding time for the best cell,AMR7.95
C310040004 Holding time for the best cell,AMR7.4
C310040005 Holding time for the best cell,AMR6.7
C310040006 Holding time for the best cell,AMR5.9
C310040007 Holding time for the best cell,AMR5.15
C310040008 Holding time for the best cell,AMR4.75
C310040075 Holding time for the non-best cell,AMR12.2
C310040076 Holding time for the non-best cell,AMR10.2
C310040077 Holding time for the non-best cell,AMR7.95
C310040078 Holding time for the non-best cell,AMR7.4
C310040079 Holding time for the non-best cell,AMR6.7
C310040080 Holding time for the non-best cell,AMR5.9
C310040081 Holding time for the non-best cell,AMR5.15
C310040082 Holding time for the non-best cell,AMR4.75
C310073296 Holding time for the DRNC cell,AMR12.2
C310073297 Holding time for the DRNC cell,AMR10.2
C310073298 Holding time for the DRNC cell,AMR7.95
C310073299 Holding time for the DRNC cell,AMR7.4
C310073300 Holding time for the DRNC cell,AMR6.7
C310073301 Holding time for the DRNC cell,AMR5.9
C310073302 Holding time for the DRNC cell,AMR5.15
C310073303 Holding time for the DRNC cell,AMR4.75
C310073296 Holding time for the DRNC cell,AMR12.2
C310073297 Holding time for the DRNC cell,AMR10.2
C310073298 Holding time for the DRNC cell,AMR7.95
C310073299 Holding time for the DRNC cell,AMR7.4
C310073300 Holding time for the DRNC cell,AMR6.7
C310073301 Holding time for the DRNC cell,AMR5.9
C310073302 Holding time for the DRNC cell,AMR5.15
C310073303 Holding time for the DRNC cell,AMR4.75
NB-AMR Rate Control
ZTE Confidential Proprietary 47
C310291927 Number of abnormal release RAB by Uu-fail,CS,AMR
12.2
C310291928 Number of abnormal release RAB by Uu-fail,CS,AMR
10.2
C310291929 Number of abnormal release RAB by Uu-fail,CS,AMR
7.95
C310291930 Number of abnormal release RAB by Uu-fail,CS,AMR
7.4
C310291931 Number of abnormal release RAB by Uu-fail,CS,AMR
6.7
C310291932 Number of abnormal release RAB by Uu-fail,CS,AMR
5.9
C310291933 Number of abnormal release RAB by Uu-fail,CS,AMR
5.15
C310291934 Number of abnormal release RAB by Uu-fail,CS,AMR
4.75
C310373796 Number ofRAB by RAB releasefor
CS,conversation:AMR 12.2
C310373797 Number ofRAB by RAB releasefor
CS,conversation:AMR 10.2
C310373798 Number ofRAB by RAB releasefor
CS,conversation:AMR 7.95
C310373799 Number ofRAB by RAB releasefor
CS,conversation:AMR 7.4
C310373800 Number ofRAB by RAB releasefor
CS,conversation:AMR 6.7
C310373801 Number ofRAB by RAB releasefor
CS,conversation:AMR 5.9
C310373802 Number ofRAB by RAB releasefor
CS,conversation:AMR 5.15
C310373803 Number ofRAB by RAB releasefor
CS,conversation:AMR 4.75
C310800164 Max Number of DC+MIMO users in NodeB
C310800165 Current Number of DC+MIMO users in NodeB
C310231185 Total number of RABrelease for CS domain,AMR 12.2
C310231186 Total number of RABrelease for CS domain,AMR 10.2
NB-AMR Rate Control
ZTE Confidential Proprietary 48
C310231187 Total number ofRABreleasefor CS domain,AMR 7.95
C310231188 Total number of RABrelease for CS domain,AMR 7.4
C310231189 Total number of RABrelease for CS domain,AMR 6.7
C310231190 Total number of RABrelease for CS domain,AMR 5.9
C310231191 Total number ofRABreleasefor CS domain,AMR 5.15
C310231192 Total number ofRABreleasefor CS domain,AMR 4.75
C310231231 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 12.2
C310231232 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 10.2
C310231233 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 7.95
C310231234 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 7.4
C310231235 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 6.7
C310231236 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 5.9
C310231237 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 5.15
C310231238 Number of RNC initiate RAB release by Iu release
request for CS domain,AMR 4.75
C310231162 Number of RAB abnormal release for CS domain,AMR
12.2
C310231163 Number of RAB abnormal release for CS domain,AMR
10.2
C310231164 Number of RAB abnormal release for CS domain,AMR
7.95
C310231165 Number of RAB abnormal release for CS domain,AMR
7.4
C310231166 Number of RAB abnormal release for CS domain,AMR
6.7
C310231167 Number of RAB abnormal release for CS domain,AMR
5.9
C310231168 Number of RAB abnormal release for CS domain,AMR
NB-AMR Rate Control
ZTE Confidential Proprietary 49
5.15
C310231169 Number of RAB abnormal release for CS domain,AMR
4.75
5.2 Related Alarms
This feature has no related alarms.
6 Engineering Guide
6.1 Application Scenario
6.1.1 ZWF21-02-001 Conversational RAB for AMR
With this feature, users can make calls on the ZTE UMTS network. This feature is a basic
feature of UMTS networks.
6.1.2 ZWF21-04-005 AMR Rate Controlling
With this feature, ZTE's RNC can adjust the uplink and downlink NB-AMR rates based on
the UE uplink transmit power and NodeB downlink transmit power respectively, or adjust
AMR rates during resource congestion. This feature improves cell capacity and user
experience when radio link quality is reduced.
6.1.3 ZWF21-06-002 TrFO
With this feature, Out of Band Transcoder Control (OoBTC) can be used during NB-AMR
service establishment to implement consistent voice encoding and decoding negotiation
between the UE and the network. In this way, the TC (Transcoder) is not necessary and
coded voice data is transmitted transparently between users. This improves voice quality
and saves transmission bandwidth between core networks.
NB-AMR Rate Control
ZTE Confidential Proprietary 50
6.2 Feature Activation Procedure
6.2.1 ZWF21-02-001 Conversational RAB for AMR
None.
6.2.2 ZWF21-04-005 AMR Rate Controlling
6.2.2.1 Uplink Rate Adjustment Based on the UE Transmit Power
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > PLMN Relating Configuration > Logic RNC
Configuration and set AMR Rate Adjustment Switch for RNC, see the following
figure.
Figure 6-1 Parameter Configuration Interface 1
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > UTRAN Cell and set Used UE Internal
Measurement Profile to default, see the following figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 51
Figure 6-2 Parameter Configuration Interface 2
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Measurement
Configuration > UE Internal Measurement Profile and set Profile ID to default, see
the following figure.
Figure 6-3 Parameter Configuration Interface 3
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Measurement
NB-AMR Rate Control
ZTE Confidential Proprietary 52
Configuration > UE Internal Measurement Profile > UE Transmitted Power Event
Measurement Configuration for AMR and set Measurement Report Transfer Mode,
Filter Coefficient, Maximum Event Number of UE Internal Measurement, UE
Internal Measurement Event Identity, Time to Trigger, and UE Transmitted Power
Threshold, see the following figure.
Figure 6-4 Parameter Configuration Interface 4
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Service Function >
Power Control Profile Related to Service > Power Control Related to Service >
Power Control Related to Service and Diversity Mode and set Maximum Allowed
Uplink DPCH Transmission Power, see the following figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 53
Figure 6-5 Parameter Configuration Interface 5
6.2.2.2 Downlink Rate Adjustment Based on the Dedicated Measurement of NodeB
Transmit Power
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > PLMN Relating Configuration > Logic RNC
Configuration and set AMR Rate Adjustment Switch for RNC, see the following
figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 54
Figure 6-6 Parameter Configuration Interface 6
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Measurement
Configuration > NodeB Dedicated Measurement Profile and set Profile Id to default,
see the following figure.
Figure 6-7 Parameter Configuration Interface 7
NB-AMR Rate Control
ZTE Confidential Proprietary 55
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Measurement
Configuration > NodeB Dedicated Measurement Configuration and set Function of
Configuration Parameters, Dedicated Measurement Type, Measurement Filter
Coefficient, Report Characteristics, Measurement Threshold of Event A/B for
Transmitted Code Power, Measurement Change Time/Measurement Hysteresis
Time, Choice Report Periodicity Scale, and Report Period, see the following figure.
Figure 6-8 Parameter Configuration Interface 8
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Service Configuration > Measurement
Configuration > NodeB Dedicated Measurement Configuration and set DPCH
Maximum DL Power to default, see the following figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 56
Figure 6-9 Parameter Configuration Interface 9
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Global Information Configuration > Dynamic
Radio Bearer Control Information Profile > Dynamic Radio Bearer Control
Information and set Event A Counter Threshold for PS on DL DCH or DL AMR
Decreasing Rate Based on D-TCP and Event B Counter Threshold for Restriction
PS Increasing Rate on DL DCH or Triggering DL AMR Increasing Rate Based on
D-TCP to default, see the following figure.
Figure 6-10 Parameter Configuration Interface 10
NB-AMR Rate Control
ZTE Confidential Proprietary 57
6.2.2.3 Dynamic Adjustment Triggered by Load and Resource Congestion
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration > Global Information Configuration > Dynamic
Radio Bearer Control Information Profile > Dynamic Radio Bearer Control
Information and set Switch of Forbidding AMR Deceleration Triggered by
Congestion Control and Switch of Forbidding AMR Deceleration Triggered by
Overload Control to default, see the following figure.
Figure 6-11 Parameter Configuration Interface 11
6.2.3 ZWF21-06-002 TrFO
In the configuration resource tree, select Modify Area > Managed Element > UMTS
Logical Function Configuration and set S Intra-RAT V1+V2 Amr Cut Decision and
Inter-RAT V1+V2 Amr Cut Decision, see the following figure.
NB-AMR Rate Control
ZTE Confidential Proprietary 58
Figure 6-12 Parameter Configuration Interface 12
6.3 Feature Validation Procedure
6.3.1 ZWF21-02-001 Conversational RAB for AMR
N/A
6.3.2 ZWF21-04-005 AMR Rate Controlling
Table 6-1 Feature Validation Procedure
Test Item AMR Rate Controlling based on UE TxPower
Prerequisit
es
1. The WCDMA system is ready.
2. Cell1 supports HSUPA, HSDPA, and DCH.
3. Both the CN and the RNC support multiple rates for AMR. Uplink
and downlink AMR voice supports the rates of 12.2 kbps, 7.4 kbps,
5.15 kbps, and 4.75 kbps.
4. UE1 and UE2 camp on Cell1 in idle mode.
Steps
1. UE1 makes an AMR voice call to UE2 in Cell1.
2. UE1 is deleted from Cell1 to trigger event 6A. The uplink AMR rate
of UE1 is decreased.
3. UE1 is added to Cell1 to trigger event 6B. The uplink AMR rate of
UE1 is increased.
4. The voice call is released.
NB-AMR Rate Control
ZTE Confidential Proprietary 59
Test Item AMR Rate Controlling based on UE TxPower
Expected
Result
1. The initial and highest bit rate of the AMR voice service is 12.2
kbps.
2. The AMR rate adaptation procedure is normal.
6.3.3 ZWF21-06-002 TrFO
N/A
6.4 Feature Deactivation Procedure
6.4.1 ZWF21-02-001 Conversational RAB for AMR
N/A
6.4.2 ZWF21-04-005 AMR Rate Controlling
Table 6-2 RNC Parameter
No Parameter Name Default Value Deactivation Value
1 AMR Rate Adjustment
Switch for RNC 0:Off 0:Off
6.4.3 ZWF21-06-002 TrFO
The CN deactivates the feature.
6.5 Impact on the Network
6.5.1 ZWF21-02-001 Conversational RAB for AMR
1) Impact on Equipment Performance
None.
NB-AMR Rate Control
ZTE Confidential Proprietary 60
2) Impact on Network KPIs
Advantages of this feature:
Users can make NB-AMR conversational calls in the UMTS network.
Disadvantages of this feature:
None.
6.5.2 ZWF21-04-005 AMR Rate Controlling
1) Impact on Equipment Performance
None.
2) Impact on Network KPIs
Advantages of this feature:
With this feature, ZTE's RNC can adjust the uplink and downlink NB-AMR rates based on
the UE uplink transmit power and NodeB downlink transmit power respectively, or adjust
AMR rates during resource congestion. This feature improves cell capacity and user
experience when radio link quality is reduced.
Disadvantages of this feature:
Voice quality is slightly reduced when the NB-AMR rate is reduced.
6.5.3 ZWF21-06-002 TrFO
1) Impact on Equipment Performance
None.
2) Impact on Network KPIs
Advantages of this feature:
NB-AMR Rate Control
ZTE Confidential Proprietary 61
With this feature, Out of Band Transcoder Control (OoBTC) can be used during NB-AMR
service establishment to implement consistent voice encoding and decoding negotiation
between the UE and the network. In this way, the TC (Transcoder) is not necessary and
coded voice data is transmitted transparently between users. This improves voice quality
and saves transmission bandwidth between core networks.
Disadvantages of this feature:
None.
7 Abbreviations Abbreviation Full Name
3GPP 3rd Generation Partnership Project
UE User Equipment
NB-AMR Narrow Band Adaptive Multi-Rate
WB-AMR Wide Band Adaptive Multi-Rate
TrFO Transcoder Free Operation
OoBTC Out-of-Band Transcoder Control
TC Transcoder
8 Reference Documents
[1]ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Radio Parameter
Reference
[2]ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Ground Parameter
Reference
[3]ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Performance Counter
Reference
[4]ZXWR RNC(V3.13.10.15)Radio Network Controller Radio Parameter Reference
[5]ZXWR RNC(V3.13.10.15)Radio Network Controller Ground Parameter Reference
NB-AMR Rate Control
ZTE Confidential Proprietary 62
[6]ZXWR RNC(V3.13.10.15)Radio Network Controller Performance Counter Reference
[7]ZTE UMTS Directed Retry to GSM Feature Guide
[8]ZTE UMTS Power Control Feature Guide
[9]ZTE UTMS Overload Control Feature Guide
[10]ZTE UMTS Congestion Control Feature Guide
[11]ZTE UMTS Adaptive Radio Bearer Feature Guide