owj200005 hsupa principle issue 1.0
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8/13/2019 Owj200005 Hsupa Principle Issue 1.0
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HSUPA Principle
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Contents
1. Overview
2. Key technologies
3. HSUPA Channel
4. HSUPA RRM
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Overview
HSUPA: High Speed Uplink Packet Access
3GPP has not defined HSUPA in R6 specification, but
enhanced dedicated channel (E-DCH). Usage of the term
„HSUPA‟ instead of E -DCH follows the trend of the „HSDPA‟.
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Overview
HSUPA provides a flexible way to make uplink data rate
exceed 384kbps, which is the maximum uplink data rate in
R5
Fast uplink hybrid-ARQ (HARQ), Node B based uplinkscheduling and easier multi-code transmission are adopted
in HSUPA
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Contents
1. Overview
2. Key technologies
3. HSUPA Channel
4. HSUPA RRM
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Key Technologies
E-DCH
The central feature of HSUPA is a new uplink transport
channel, E-DCH, just like HS-DSCH of HSDPA
E-DCH supports fast Node B based scheduling, fast physicallayer HARQ, multi-code transmission and shorter (2ms)
transmission time interval (TTI)
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Key Technologies
E-DCH
Unlike HS-DSCH of HSDPA, E-DCH is not a shared channel,
but a dedicated one
Structure of E-DCH is similar to the DCH of R99. Each UE hasits own dedicated E-DCH data path to the Node B which is
continuous and independent from E-DCHs of other UEs
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Key Technologies
Comparison of DCH,HS-DSCH &E-DCH
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Key Technologies
L1 HARQ
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Key Technologies
L1 HARQ
As the link direction is different in HSUPA, the soft buffer is
maintained by the Node B instead of the terminal
The terminal will keep unacknowledged data in memory, andthe MAC layers trigger retransmission if the physical layer
received a NACK from the Node Bs in the E-DCH active set
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Key Technologies
Fast Scheduling
HSDPA moved downlink scheduling from the RNC to the Node
B in order to make scheduling decisions with minimum latency.
HSUPA scheduling does the same thing for the uplink and
moves the scheduling to the Node B
HSDPA scheduling is “one -to- many”, but HSUPA scheduling is
“many -to- one”. They are totally different
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Key Technologies
Fast Scheduling
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Key Technologies
Fast Scheduling
The primary task of uplink scheduler is to ensure that overload
does not occur
The secondary task is to try and use as much of the uplinkcapacity as possible without running the risk of the cell
becoming overloaded
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Key Technologies
Multi-code Transmission
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Key Technologies
Variable Short TTI
HSDPA only supports a single TTI (2 ms).
HSUPA can support two TTI lengths (2ms and 10 ms).
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Key Technologies
Variable Short TTI
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Contents
1. Overview
2. Key technologies
3. HSUPA Channel
4. HSUPA RRM
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HSUPA Channel
Channels for HSUPA operation
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HSUPA Channel
E-DPDCH
After transport channel processing, the E-DCH maps to one or
multiple parallel new dedicated physical data channels – E-
DPDCHs
E-DPDCH is a new uplink physical channel used for
transmitting service data from the UE to the Node B
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HSUPA Channel
Comparison of DPDCH and E-DPDCH
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HSUPA Channel
E-DPDCH Frame Structure
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HSUPA Channel
E-DPCCH
E-DPCCH is a new uplink physical channel used for
transmitting information about E-DPDCH from the UE to the
Node B
E-DPCCH is a new channel that exists parallel to all uplink
dedicated channels of 3GPP R5 (DPDCH, DPCCH and HS-
DPCCH), and always accompanies E-DPDCH
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HSUPA Channel
E-DPCCH Slot Format
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HSUPA Channel
E-DPCCH Frame Structure
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HSUPA Channel
E-DPCCH Frame Structure
The 10 information bits on the E-DPCCH TTI consist of three
different segments
E-TFCI ( E-DCH Transport Format CombinationIndicator ,7bits )
RSN ( Retransmission Sequence Number ,2bits )
Happy bit (1bit )
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HSUPA Channel
E-HICH
E-DCH HARQ indicator Channel (E-HICH) is a new downlink
physical channel used for transmitting positive and negative
acknowledgements for uplink packet transmission
If the Node B received the transmitted E-DPDCH TTI correctly
it will respond with a positive acknowledgement (ACK) and if it
received the TTI incorrectly it will respond with a negative
acknowledgement (NACK)
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HSUPA Channel
ACK/NACK mapping to E-HICH
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HSUPA Channel
ACK/NACK mapping to E-HICH
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HSUPA Channel
E-HICH Frame Structure
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HSUPA Channel
E-RGCH
E-DCH relative grant channel( E-RGCH ) is a new downlink
physical channel used for transmitting single step (up/down)
scheduling commands
The commands sent by E-RGCH will affect the relative
transmission power the UE is allowed to use for data channel
transmission (E-DPDCH), thus effectively adjusting the uplink
data rate up/down
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HSUPA Channel
Message mapping to E-RGCH
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HSUPA Channel
Multiplexing of E-RGCH & E-HICH
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HSUPA Channel
E-AGCHE-DCH absolute grant channel (E-AGCH) is a new downlink
physical channel used for transmitting an absolute value of the
Node B scheduler‟s decision
E-AGCH tells UE the relative transmission power it is allowed
to use for E-DPDCH, then UE will know the maximum
transmission data rate it may use
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HSUPA Channel
Content of E-AGCHThe information bits on the E-AGCH TTI consist of three
different parts:
Absolute grant value ( 5bits ) Absolute grant scope ( 1bit )
Primary/Secondary UE ID (16bit )
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Contents
1. Overview
2. Key technologies
3. HSUPA Channel
4. HSUPA RRM
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HSUPA RRM
HSDPA & HSUPA Radio Interface for User Data
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HSUPA RRM
HSUPA User Plane Protocol Architecture
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HSUPA RRM
New Functionality of HSUPA
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HSUPA RRM
RRM Functional Block of HSUPA
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HSUPA RRM
Resource Allocation in RNC
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HSUPA RRM
Resource Allocation in RNC
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HSUPA RRM
QoS Mapping in RNCRNC sends a lot of QoS parameters to Node B, which can be
used in packet scheduling
Scheduling priority indicator ( SPI )
MAC-es guaranteed bit rate ( GBI )
Maximum number of transmissions for HARQ
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HSUPA RRM
Admission Control in RNC Admission control decides whether or not to admit a new user toHSUPA. The decision is based on the following information
Number of active HSUPA users
Uplink interference levelsScheduling priority indicator
Guaranteed bit rate
Provided bit rate on the E-DCH
Provided bit rate on the DCHDownlink limitations
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HSUPA RRM
Mobility Management in RNC
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HSUPA RRM
Packet Scheduling in Node B
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HSUPA RRM
Packet Scheduling in Node B
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HSUPA RRM
Packet Scheduling in Node B
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HSUPA RRM
Scheduling in Soft Handover
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HSUPA RRM
L1 HARQ in Node BL1 HARQ schemes has 3 main advantages:
Retransmissions are faster at L1 in HSUPA than L2 RLC-
based retransmissions in Release 99
Soft combining of retransmissions can be used in HSUPA
Spectral efficiency will be improved, since UE is able to
operate at a higher BLER without increasing the delay
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HSUPA RRM
L1 HARQ in Soft Handover
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HSUPA RRM
HSUPA Terminal Categories