HSDPA Serving Cell Change - Failure in the Selection of Serving Cell in the Serving HS-DSCH Cell Change

Failure in allocation of Iub AAL2 or RNC internal resources:

• When the target cell for serving HS-DSCH cell change has been chosen and if the reservation of the RNC internal resources or Iub AAL2 for the MAC-d flow fails, other possible candidate cells are attempted

• If similar failure occurs also for other candidate cells, serving HS-DSCH cell change is not executed

• If the current serving HS-DSCH cell cannot be kept, e.g. due to low UL SIRerror or lost radio link, HS-DSCH shall be released and RB mapped to DCH 0/0

Failure in RL reconfiguration:

• If the BTS with the serving HS-DSCH cell does not accept RL reconfiguration request and it returns some other general cause code than „Bearer re-arrangement needed', then

serving HS-DSCH cell selection is interrupted

• If some other BTS than BTS with serving HS-DSCH cell does not accept RL

reconfiguration request, then possible other candidates for serving HS-DSCH cell are tried to be selected

• If the serving HS-DSCH cell selection is interrupted or new cell can not be found, then current serving HS-DSCH cell is kept or HS-DSCH is released and RB mapped to DCH 0/0 (depending on handover reason)

79 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Due to Periodical Ec/No Measurements

UE Node B 1 RNC SGSN

HSDPA Traffic

Measurement Report (DCH) – e1A Node B 2

UL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '11010001000110111110010011011001'B, rrc-MessageSequenceNumber 4 },

message measurementReport : { measurementIdentity 1,

measuredResults intraFreqMeasuredResultsList : { { cellSynchronisationInfo {

80 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

NBAP: Radio Link Setup

RRC: Active Set Update (DCH)

DL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '11010100101111000000000011100110'B, rrc-MessageSequenceNumber 8

Normal RL Setup, setting up RL with:

UL SF 16 (64kbps service) and

DL SF 256 and channelisation code 12

Due to Periodical Ec/No Measurements

81 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Reconfiguration Commit:

CFN for the change to be taken into use: 252

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit

NBAP: Radio Link Reconfiguration Prepare:

Modifying the HS DSCH (HS-DPCCH in SHO for better ACK/NACK and CQI detection):

CQI Power Offset = 7 -> Delta CQI 4dB ACK Power Offset = 7 -> Delta ACK 4dB Nack Power Offset =7 -> Delta NACK 4dB

Due to Periodical Ec/No Measurements

82 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

DL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '00101011000000011000111010110000'B, rrc-MessageSequenceNumber 10

}, message physicalChannelReconfiguration : later-than-r3 : { rrc-TransactionIdentifier 0,

Due to Periodical Ec/No Measurements

83 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

DL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '01110101010100111111100110010010'B, rrc-MessageSequenceNumber 12

RRC: Measurement Control

modeSpecificInfo fdd : {

measurementReportTransferMode acknowledgedModeRLC, periodicalOrEventTrigger periodical } },

v4d0NonCriticalExtensions { v590NonCriticalExtensions-r5 { measurementControl-v590ext {

rrc-TransactionIdentifier-MSP-v590ext 1 } } } } } }

Setting up periodical Ec/No measurements for HS-DSCH serving cell change procedure Periodical CPICH Ec/No

measurement are started only if the size of the active set is

greater than one. If the size of the active set is one, periodical CPICH Ec/No reporting is not started and if on going stopped

Due to Periodical Ec/No Measurements

84 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

RRC: Measurement Control RRC: Physical Channel Reconfiguration Complete (DCH)

Measurement Report (DCH) Measurement Report (DCH) Measurement Report (DCH)

UL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '01110011110000001110011110110110'B, rrc-MessageSequenceNumber 11

}, message measurementReport : { measurementIdentity 5,

measuredResults intraFreqMeasuredResultsList : { { modeSpecificInfo fdd : {

Due to Periodical Ec/No Measurements

85 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

UL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '01110011110000001110011110110110'B, rrc-MessageSequenceNumber 11

}, message measurementReport : { measurementIdentity 5,

measuredResults intraFreqMeasuredResultsList : { { modeSpecificInfo fdd : {

Periodically reported DL CPICH Ec/No

measurement results are averaged in RNC HSDPACPICHAveWindow is RNC specific

management parameter, which defines how many CPICH Ec/No measurements, which are received in the RRC: MEASUREMENT REPORT message, are included in the sliding window used in the

averaging

RNC starts the averaging already from the first measurement sample (so the Serving cell change is possible after just one measurement report), that is, the RNC calculates the averaged values from those measurement samples which are available until the number of measurement samples is

adequate to calculate averaged values over the whole averaging window

Due to Periodical Ec/No Measurements

86 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

RRC: Measurement Control RRC: Physical Channel Reconfiguration Complete (DCH)

Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A

NBAP: Radio Link Reconfiguration Prepare

Old BTS to delete the HS-DSCH user (MAC-d flow) and to new BTS to set up the HS-DSCH (MAC-d flow) with CQI Power Offset = 7 -> Delta CQI 4dB

ACK Power Offset = 7 -> Delta ACK 4dB Nack Power Offset =7 -> Delta NACK 4dB NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Ready

NBAP: Radio Link Reconfiguration Prepare

Due to Periodical Ec/No Measurements

87 © Nokia Siemens Networks Presentation / Author / Date For internal use

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

RRC: Measurement Control RRC: Physical Channel Reconfiguration Complete (DCH)

Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A

NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Ready

ALCAP : ERQ

NBAP: Radio Link Reconfiguration Prepare

ALCAP : ECF

NBAP: Radio Link Reconfiguration Commit NBAP: Radio Link Reconfiguration Commit

NBAP: Radio Link Reconfiguration Commit for both BTSs to inform the CFN when the HS-DSCH serving cell change will be taken into use.

CFN 148

Due to Periodical Ec/No Measurements

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

RRC: Measurement Control RRC: Physical Channel Reconfiguration Complete (DCH)

Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A

NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Ready

ALCAP : ERQ

NBAP: Radio Link Reconfiguration Prepare

ALCAP : ECF

NBAP: Radio Link Reconfiguration Commit NBAP: Radio Link Reconfiguration Commit

DL-DCCH-Message { integrityCheckInfo {

messageAuthenticationCode '00010111101111000000001101110110'B, rrc-MessageSequenceNumber 13

}, message radioBearerReconfiguration : later-than-r3 : { rrc-TransactionIdentifier 1,

RRC: Radio Bearer Reconfiguration

Due to Periodical Ec/No Measurements

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

^UE ^{Node B 1} ^RNC ^SGSN

HSDPA Traffic

NBAP: Radio Link Setup Response Measurement Report (DCH) – e1A

Node B 2

RRC: Active Set Update (DCH)

NBAP: Radio Link Setup

NBAP: Radio Link Synchronisation RRC: Active Set Update Complete (DCH)

NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready

RRC: Measurement Control

NBAP: Radio Link Reconfiguration Commit RRC: Physical Channel Reconfiguration

RRC: Measurement Control RRC: Physical Channel Reconfiguration Complete (DCH)

Measurement Report (DCH) – e1A Measurement Report (DCH) – e1A

NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Ready

ALCAP : ERQ

NBAP: Radio Link Reconfiguration Prepare

ALCAP : ECF

NBAP: Radio Link Reconfiguration Commit NBAP: Radio Link Reconfiguration Commit

RRC: Radio Bearer Reconfiguration RRC: Radio Bearer Reconfiguration Complete (DCH)

Due to Periodical Ec/No Measurements

ALCAP : Release Request ALCAP : Release Confirm

HS-DSCH AC

Dynamic Power Allocation (DPA) Link Adaptation Optimisation

Proportional Fair Scheduler

Initial HSDPA Serving Cell Selection HSDPA Serving Cell Change

• Introduction

• Periodical CPICH Ec/No Measurements

• CPIHC Ec/No Triggered SCC

• Periodical UL SIRerror Triggered SCC

• Periodical UL SIRerror Measurements

• Event 1B Triggered SCC

• Event 1C Triggered SCC

• RL Failure, Serving HS-DSCH Link Moved to DRNC, RL Removal Due to 6F, 6G

• Too Frequent Serving Cell Changes

• ISHO with SCC

HSDPA Serving Cell Change – UL SIRerror

In document HSDPA Performance Improvement Discussion_NSN_20070518 (Page 76-89)

HSDPA Serving Cell Change - Failure in the Selection of Serving Cell in the Serving HS-DSCH Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Cell DCH – HS-DSCH -> HS-DSCH ->Cell Change

Contents

HSDPA Serving Cell Change – UL SIRerror