“amr unpacking optimization” feature

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GSM/EDGE BSS, Rel.

RG20(BSS), Operating

Documentation, Issue 09

Feature description

BSS21120: AMR Unpacking Optimization

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Approval Date 2011-02-07

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Table of contentsThis document has 14 pages.

Summary of changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.1 In general. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2 Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Functional overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Functional split. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2.1 NetAct interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2.2 BSC MMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.2.3 Plan provisioning interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4 System impacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.2 MML commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.1 MML command EHB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2.2 MML command EHO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.3 MML command EHC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14



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List of figuresFigure 1 Intra-cell HOs due to bad RX quality are prevented when RxQual = 7. . . 9



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List of tablesTable 1 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12



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Summary of changes

Summary of changes Changes between document issues are cumulative. Therefore, the latest document

issue contains all changes made to previous issues.

Changes between issues 2A (2011/03/31, RG20(BSS)) and 2-0(2010/04/13,

RG20(BSS))

System impacts (4)

• Added a new section BSS21534: OSC Full Rate with SAIC MS in section Relation

to other features, to describe the working of BSC in relation to BSS21534: OSC Full

Rate with SAIC MS feature.

Changes between issues 2-0 (2010/04/13, RG20(BSS)) and 1-3(2009/08/01,

RG10(BSS))

System impacts (4)

Added a new section BSS2139: OSC Half Rate with SAIC MS in section Relation to

other features, to describe the working of BSC in relation to the feature BSS2139: OSC

Half Rate with SAIC MS.

Changes between issues 1-3 and 1-2

Editorial changes



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BSS21120: AMR Unpacking Optimization Introduction

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1 Introduction

1.1 In generalThe “AMR unpacking optimization” (BSS21120) feature provides new AMR quality and

level based handover parameters to avoid unnecessary unpacking in intra-cell AMR

FR/HR handovers.

When the field strength drops rapidly, the quality of service also drops typically. This

triggers AMR unpacking handovers. If the field strength drop is high, quality is degraded.

The mobile cannot decode handover assignments and handover is not performed. Also,

when the MS moves round a corner, its own RX level is not changed, but the interfer-

ence becomes stronger. This can cause drops to “bad” quality levels in the MS. In a

“bad” quality level, SACCH decoding in the MS fails, and hence the MS cannot identify

any handover assignments.

Normally, the radio-link time-out timer controls the time for which the mobile can be

unreachable, before the TCH is deactivated and the call is regarded as a dropped call.

This can be e.g. 16 seconds. When a handover starts using a fixed 6 seconds timer to

control handover success, and if the MS does not answer during this time with either a

successful or a non-successful handover, then the BSC deactivates the target and

source channels. This is considered as a drop. Without an intra-cell handover start, the

MS could still have about 10 seconds to get out of the bad coverage.

When RX quality on the AMR HR channel is below the unpacking threshold, but RX level

conditions are good, it is reasonable to perform an intra-cell HO to a better HR channel

in the cell. This is achieved by preventing AMR unpacking handover when the RX level

is high enough.

Due to this feature, the HO algorithm prevents AMR unpacking and interference-based

intra-cell handovers, when the RX level and/or RX quality conditions are very bad. Also,

unnecessary AMR unpacking handovers are avoided when the RX level is good. With

this, the dropped call rate can be reduced.

Refer to the “Parameters” section for more details on the parameters and their effects.

1.2 Benefits

This feature saves capital expense and improves network quality by reducing the rate

of dropped calls.

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Requirements

2 RequirementsThe BSC S14 software is required and there are no specific hardware requirements for

this feature.

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BSS21120: AMR Unpacking Optimization Functional description

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3 Functional descriptionThis feature provides new AMR quality and level based handover parameters to avoid

unnecessary unpacking in intra-cell FR / HR handovers.

This chapter is divided into the following sections:

• “Functional overview”

• “Functional split”

For more information on activating this feature, refer to “ Activating and testing

BSS21120: AMR unpacking optimization”.

3.1 Functional overview

The “AMR unpacking optimization” feature is controlled by means of a license key.

When the feature is active, the HO algorithm uses new RX quality and RX level limits to

prevent AMR unpacking and interference-based intra-cell handovers when RX leveland/or RX quality conditions are very bad. Unnecessary AMR unpacking handovers are

prevented when RX level conditions are good. Also, packing is denied if the quality level

is bad.

In the example shown in “Figure 1”, the conditions for AMR unpacking HO are fulfilled

when the RX quality is 4 or worse, but if the average uplink or downlink RX quality

(RxQual) is 7, then AMR unpacking HO is not allowed because of the new “Intra HO

prevent threshold lower rx qual” parameter.

In this example, this new parameter is set to the default of 7, and the existing “Intra HO

threshold RX qual AMR HR” (IHRH) parameter is set to 4.

Figure 1 Intra-cell HOs due to bad RX quality are prevented when RxQual = 7

In “Figure 1”:

• For AMR FR:

– Packing is allowed due to good quality (RXQual = 0 or 1) when signal strength

is between -47 dBm and -100 dBm.

0

RxLev -101dBm to -110dBm-49dBm to -100dBm-47dBm to -48dBm

Packing HO Packing not allowed due to poor signal strength

No action R x Q u a l

1

2

4

5

6

7

3

0

RxLev -101dBm to -110dBm-49dBm to -100dBm-47dBm to -48dBm

AMR HR

AMR FR

Unpacking not allowed due to poor signal strengthUnpacking not allowed due to very good level

Unpacking not allowed due to very bad quality

Unpacking

Unpacking not allowedUnpacking not allowed

No action

R x Q u a l

1

2

4

5

6

7

3

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Functional description

– Packing and interference HO are not allowed with RXQual = 0 or 1 when signal

strength is poor, below -100 dBm

– Packing is not allowed with RXQual = 2 to 7

• For AMR HR: • Unpacking is allowed with RXQual =4 to6 when signal strength is between - 49

dBm and -100 dBm

• Unpacking is not allowed with RXQual = 4 to 6 when signal strength is very

good, above -49 dBm

• Unpacking and interference HO are not allowed with RXQual = 4 to 6 when

signal strength is poor, below - 100 dBm

• Unpacking and interference HO are not allowed due to very bad quality, with

RXQual = 7

• Unpacking is not allowed with RXQual = 0 to 3.

The interference-based intra-cell handovers are prevented if the new “Intra HO prevent

threshold lower rx qual” parameter is set to 7, and the average uplink or downlink RXquality is also 7.

For the lower RX level limit ( defined by the new “Intra HO prevent threshold lower RX

level AMR HR” parameter), the RX level is checked instead of the RX quality. If condi-

tions for AMR unpacking HO are fulfilled, but the average uplink or downlink RX level is

lower than defined by this new parameter, then AMR unpacking HO is not triggered.

There is also a new parameter to define the upper limit (“Intra HO prevent threshold

upper rx level AMR HR”). AMR unpacking HOs are avoided if the uplink or downlink RX

level is better than defined by this new parameter.

Refer to “Parameters” for more information on the new parameters of this feature.

3.2 Functional split

This feature is controlled by means of a license key. The state (OFF/CONF/ON) of the

feature is displayed and can be changed using the platform feature management MML.

When the license expires, the BSC automatically stops using this feature. However, the

values of the new parameters remain unchanged even when the license key has

expired.

3.2.1 NetAct interface

NetAct supports the “AMR unpacking optimization” license key control, as well as the

associated new HOC parameters.

3.2.2 BSC MMI

The BSC MMI supports the “AMR unpacking optimization” license key control, as well

as the associated new HOC parameters.

3.2.3 Plan provisioning interface

The plan provisioning interface supports the new HOC parameters.

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BSS21120: AMR Unpacking Optimization System impacts

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4 System impacts

Relation to other features

The AMR unpacking optimization feature is related to the following other features:

• DFCA

The handover algorithm functionality is already implemented in the DFCA context.

For more information, refer to the “Dynamic frequency and channel allocation”

(BSS11052) feature description.

• License Key

The UTPFIL parameters (for RX quality and RX level limits) implemented are

replaced by new HOC parameters. The “AMR unpacking optimization” feature

includes MML support for the new parameters. The functionality of the feature is

controlled by means of a license key.

• BSS21309: OSC Half Rate with SAIC MS

When the AMR unpacking optimization feature is used along with OSC Half Rate,

the BSC follows the parameters of AMR unpacking optimization to prevent demulti-

plexing of OSC Half Rate connections into non-OSC connections as well as the intra

cell handovers due to interference for the OSC Half Rate connections in case of very

poor quality.

When AMR unpacking optimization is in use, the BSC uses the signal level thresh-

olds of the feature to direct an OSC Half Rate connection either to AMR HR or to

AMR FR in a triggered demultiplexing handover, or to prevent totally the demulti-

plexing handover if the signal level is very poor.

• BSS21534: OSC Full Rate with SAIC MS

When the AMR unpacking optimization feature is used along with OSC Full Rate,

the BSC follows the parameters of AMR unpacking optimization to prevent demulti-plexing of OSC Full Rate connections into non-OSC connections.

The BSC also prevents the intra-cell handover of OSC Full Rate connection due to

interference in cases of very poor quality.

When AMR unpacking optimization is in use, the BSC uses the signal level thresh-

olds of the feature to prevents demultiplexing handover if the signal level is very

poor.

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User interface

5 User interfaceThe impacts of the “AMR unpacking optimization” feature on the user interface are

described in this chapter.

The chapter is divided into the following two sections:

• “Parameters”

• “MML commands”

5.1 Parameters

The new parameters for “AMR unpacking optimization” are described in “Table 1”.

Name Level Description Range Default

value

Intra HO lower

RX level limit

AMR HR

HOC This parameter defines the

limit for the average uplink

and downlink signal level. If

the average uplink or

downlink signal level is worse

than this parameter, then

quality-based intra-cell han-

dovers are not allowed.

This parameter is displayed if

the feature state is CONF or

ON.

-110 .... -47

dBm

-100

dBm

Intra HO upper

RX level limit

AMR HR


limit for the average uplink

and downlink signal level. If

the average uplink or

downlink signal level is better

than this parameter, then

quality-based intra-cell han-

dovers are not allowed.



ON.

-110 .... -47

dBm

-47

dBm

Table 1 Parameters

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5.2 MML commands

This section descibes the changes to the MML commands due to the “AMR unpacking

optimization” feature.

5.2.1 MML command EHB

1. SEG and SEGNAME parameter support is included in the EHB command. These

paremeters are used only with the new AMR signal quality threshold parameters:

• LQLAMR = intra HO lower rx quality limit AMR • LLLAMR = intra HO lower rx level limit AMR HR

• ULLAMR = intra HO upper rx level limit AMR HR

2. If the SEG or SEGNAME parameter is used, only the new segment level AMR signal

quality threshold parameters LLLAMR, ULLAMR and LQLAMR can be entered, and

only these are printed out. See the example given below.

3. The functionality of old parameters does not change. These old parameters can not

be used with the SEG or SEGNAME parameters. If the SEG or SEGNAME parameter

is given, then the old parameters are hidden in the second block.

4. The BTS and NAME can be used with these new parameters when the segment has

only one BTS. If the segment has more than one BTS, the LLLAMR, ULLAMR and

LQLAMR parameters are hidden in the second block.The new functionality is marked in bold and the old in normal font:

Intra HO lower

RX qual limit AMR


limit of the average uplink anddownlink signal quality. If the

average uplink or downlink

signal quality is worse than

this parameter, then quality-

based intra-cell handovers

are not allowed.



ON.

< 0.2% (0),

0.2% - 0.4% (1),

0.4% - 0.8% (2),

0.8% - 1.6% (3),

1.6% - 3.2% (4),

3.2% - 6.4% (5),

6.4% - 12.8% (6),

> 12.8% (7)

> 12.8%

(7)

Name Level Description Range Default

value

Table 1 Parameters (Cont.)

Syntax EHB: ( BTS = <BTS identification> |

NAME = <BTS name> |

SEG = <SEG identification> <option> |

SEGNAME = <SEG name> <option> );

( QDRF = <threshold dl Rx qual AMR FR> <option> |

QURF = <threshold ul Rx qual AMR FR> <option> |

QDRH = <threshold dl Rx qual AMR HR> <option> |

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User interface

Output example: modifying the AMR signal quality threshold parameters of SEG-1

ZEHB:SEG=1:LLLAMR=-80,ULLAMR=-90,LQLAMR=6;

BSC3i BSC-LAB 2007-12-18 13:20:02

HANDOVER CONTROL AMR SIGNAL QUALITY THRESHOLD PARAMETERS OF SEG-

0001 TESTLAB

INTRA HO LOWER RX LEVEL LIMIT AMR HR ........ - 80 dBm

INTRA HO UPPER RX LEVEL LIMIT AMR HR ........ - 90 dBm

INTRA HO LOWER RX QUAL LIMIT AMR ........ 6.4% - 12.8 %

COMMAND EXECUTED

5.2.2 MML command EHO

The new HOC parameters are added to the EHO command output.

5.2.3 MML command EHCThe new HOC parameters are added to the EHC command output.

QURH = <threshold ul Rx qual AMR HR> <option> |

IHRF = <intra HO threshold Rx qual AMR FR> <option> |

IHRH = <intra HO threshold Rx qual AMR HR> <option> |

GCIF = <super reuse good C/I threshold AMR FR>

<option> |

BCIF = <super reuse bad C/I threshold AMR FR> <option>

|

GCIH = <super reuse good C/I threshold AMR HR>

<option> |

BCIH = <super reuse bad C/I threshold AMR HR> <option>

|

LLLAMR = <intra HO lower Rx level limit AMR HR> <option> |

ULLAMR = <intra HO upper Rx level limit AMR HR> <option> |

LQLAMR = <intra HO lower Rx qual limit AMR HR> <option> ) ...;

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“amr unpacking optimization” feature

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