Code Optimization Suggestion

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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Code Optimization Suggestion for Indosat 3G Network

2009-03-18

HUAWEI TECHNOLOGIES CO., LTD. Page 2Huawei Confidential

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Content

• Overview

• Current Network Code Congestion

• Parameter Code Optimization Suggestion





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OverviewRight now the current user & traffic (especially for PS services) from all of Indosat 3G network has increasing rapidly and the situation it’s effect to the network capacity and will impact to the customer perception. For Indosat 3G huawei right now using the RNC version 1.7 that has some of feature to improving the network capacity.





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Content

• Overview


• Parameter Code Optimization Suggestion





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Current Network Code CongestionTo know the numbers of RRC Connection Rejects due to Radio Resource Congestion (Cell) in the network Huawei, using the counter VS.RRC.Rej.Code.Cong

DescriptionEach of the above items provides the number of RRC CONNECTION REJECT messages from the RNC to UEs in a cell due to radio resource congestion after receiving RRC CONNECTION REQUEST messages from the UEs, as shown below.

Measurement pointThe measurement is triggered at point A as shown in the figure, that is, when the RNC sends an RRC CONNECTION REJECT message to a UE. The RNC measures the items by the cells the UEs camps on and by the causes for RRC connection reject.

Code Congestion Mkss

Code congestion Blpp





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Content

• Overview


• Code Optimization Suggestion





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Code Optimization Suggestion

Code Optimization Suggestion:

• Decrease the BE Guarantee BE Rate (GBR)

• Using the HSDPA dynamic code allocation





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Decrease the BE Guarantee BE Rate (GBR) in DCCC Algorithm

Upsize and downsize the data rate of the best effort (BE) services, (i.e. interactive and background) in the CELL_DCH RRC state current status BE service set to 64 Kbit/s





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Decrease the BE Guarantee BE Rate (GBR) in DCCC Algorithm The SF factor for PS 64 Kbps if we see consumed more higher SF code (see

below table) so we propose to decrease the GBR to 32 Kbps. To ensure this setting is not effect to the KPI need to monitor it before & after implementation and this setting effect to customer perception throughput since it will decrease the minimum GBR.

Service Type Code Mapping

UL SF DL SF

32 Kbps SF32 SF64

64 Kbps SF16 SF32





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HSDPA Dynamic/Automatic Code Allocation

The dynamic/automatic code allocation algorithm/configuration is manage the HS-PDSCH code that not use during the specific time so it can make use to other service and make the HS-PDSCH code use efficient. Current configuration for the HS-PDSCH code in Indosat 3G network is set to manual/static





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Static Code Allocation Simple but robust The code allocation for HS-

SCCHs and HS-PDSCHs is static. It is configurable

Low code utilization efficiency

SF=256SF=128 ┏ ━ ●C(256,0) : PCPI CH

┏ 0 ┫SF=64 ┃ ┗ ━ ●C(256,1) : PCCPCH

┏ 0 ┫┃ ┃ ┏ ━ ●C(256,2) : AI CH┃ ┗ 1 ┫

SF=32 ┃ ┗ ━ ●C(256,3) : PI CH┏ 0 ┫

SF=16 ┃ ┗ ●C(64,1) :SCCPCH 1┏ 0 ┫┃ ┃┃ ┃ ┏ ●C(64,2) :SCCPCH 2┃ ┃ ┃┃ ┗ 1 ┫

SF=8 ┃ ┃ ┏ ━ ●C(128, 6) : HS-SCCH 1┏ 0 ┫ ┗ 3 ┫

SF=4 ┃ ┗ ━ ○1 ┃┏ 0 ┫ ┗ ━ ●C(128, 7) : HS-SCCH 2┃ ┗ ○1┃┗ ━ ○1 ┏ ━ ○2┃ ┏ ○6 ● CCH┃ ┃ SF=16 ● HSDPA┃ ┃ ┏ ●C(16, 14) : HS-PDSCH 2 ○ DCH┗ ━ 3 ┫ ┃

┗ 7 ┫┗ ●C(16, 15) : HS-PDSCH 1

HSDPA Code Allocation (1)

HS-PDSCH Code Num--- This parameter sets the number of HS-PDSCH codes available in a cell.

ADD CELLHSDPA





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HSDPA Code Allocation (2) RNC will continuously monitor the usage of

OVSF codes for DPCH channels Via RNC reconfiguration procedure Better code utilization efficiency

Codes for CCH and HS-SCCH

7 8 9 10 12 13 146543 15210

Shared codes

Reserved codes for DPCH

Minimum reserved codes for HSDPA

SF=16

Re-allocated to HSDPA if the codes used by the established DPCHs are much less than the codes available

It will be called back by DPCHs through reconfiguring the codes for HSDPA if the codes are almost used up by DPCH channels

SF=16

SF=16

Maximum available codes for HSDPA

….

RNC-Controlled Dynamic Allocation

Maximum Number of HS-PDSCH Codes-- The maximum number of HS-PDSCH codes available in a cell

Minimum Number of HS-PDSCH Codes-- The minimum number of HS-PDSCH codes available in a cell

ADD CELLHSDPA

11





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HSDPA Code Allocation (3) NodeB-controlled Dynamic Code Allocation The minimum number of codes for HSDPA is configurable Reconfiguration procedure is not needed Making full use of the whole code tree

Codes for CCH and HS-SCCH

7 8 9 10 11 12 13 146543 15210

Available codes for DPCH Reserved codes for HSDPA

SF=16

Node B enlarges the allocated codes for HSDPA temporally due to HSDPA data transmission if the adjacent code is free

Node B will release the code temporally occupied by HSDPA when it is allocated to DPCH by RNC

SF=16

SF=16

….

• Code Number for HS-PDSCH ADD CELLHSDPA





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Code Optimization Suggestion

Code Optimization Suggestion:

• Decrease the BE Guarantee BE Rate (GBR)

• Using the HSDPA dynamic code allocation

• Adding the node B in some of the dense traffic to support

the capacity

• Adding the second carrier to support the capacity too

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Code Optimization Suggestion