Benefits of FD Feature and Impacts of PCH Trial v1.1

5/20/2018 Benefits of FD Feature and Impacts of PCH Trial v1.1

1/12HUAWEI TECHNOLOGIES CO., LTD. Confidential Page 1

Benefits of FD Feature and

Impacts of PCH Trial



Contents

Summary of FD Feature Trial

Summary of HS Cell_FACH Trial

Impact of PCH without FD Feature

Cell_PCH and URA_PCH Implementation

Conclusion

Recommendation




As in earlier FD Feature Trial, we have proven the benefits of FD as below:

State transition delay time has shown improvement, which will reflect to

better user experience.

Without FD feature, all UEs will transit to cell FACH & PCH, which may

cause higher load to FACH channel & may increase RNC load with UEs

doing state transition.




FD feature will allow IMEI TAC to be enable, which will allow network

operator to have specific & customize setting for indentified

Smartphone UEs.

With FD feature & IMEI TAC enable, the signaling procedure has been

reduced, which will help to reduce the RNC load.

User experience:

With FD feature & IMEI TAC turned on, the user behavior & experience

for Smartphone UE has not been interrupted.

Access delay for both CS & PS service, has been maintained & range in

acceptable levels.



Summary of HS Cell_FACH Trial

Advantage:

Better optimize of the HSPA scheduler resource

- 28% reduction of active HSDPA users (reduce from 7000 to 5000)*

- 28% reduction of active HSUPA users (reduce from 3500 to 2500)*

Improve HSDPA and HSUPA Throughput and Data Volume

- Improve HSDPA throughput from 600kbps to 700kbps*

- Improve HSDPA data volume around 800,000 Mbytes**

- Improve HSUPA throughput from 30kbps to 36kbps*

- Improve HSUPA data volume around 70,000 Mbytes**

* RNC average per day

** RNC sum per week

Disadvantage:

Degradation on PS Drop

- RNC PS Drop rate increase from 1.3% to 1.7%



For non Smart Phone:

More cell updates messages will be sent and this will increase

the signaling processing load in RNC and NodeB.

More UE will stay at common channel and this will increase

the PS drop call (RB lost will increase compared to Idle Mode)

due to no power control in PCH.

More data will be transferred in FACH and this will causecommon channel congestion, paging success rate and call

setup success rate will degrade if no expansion is performed.

More UE will be holding RRC Connection and this will cause

the waste of resources.

For Smart Phone:

SCRI (Signaling Connection Release Indication) may overflow

the signaling processing unit in RNC and NodeB.

Impact of PCH without FD Feature




Cell_PCH

1) SCCPCH Expansion

Expand SCCPCH - 1 FACH and 1 PCH, and monitor the FACH user

number and utilization, and PCH utilization.

2) Modify IUPS Activity Factor

MOD TRMFACTOR:FTI=3, REMARK=" IUPS" , PSCONVDL=10,

PSCONVUL=10, PSSTRMDL=10, PSSTRMUL=10, PSINTERDL=10,

PSINTERUL=10, PSBKGDL=10, PSBKGUL=10, HDSRBDL=10,

HDCONVDL=10, HDSTRMDL=10, HDINTERDL=10, HDBKGDL=10,

HUSRBUL=10, HUCONVUL=10, HUSTRMUL=10, HUINTERUL=10,

HUBKGUL=10, HDVOICEDL=10, HUVOICEUL=10, HDSIPDL=10,

HUSIPUL=10;

The reasons of modifying IUPS Activity Factor is to prevent admission

failure on the IUPS interface due to increase of UEs in Cell_PCH or

URA_PCH state.


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HUAWEI TECHNOLOGIES CO., LTD. Confidential Page 8


3) Activate PCH, and set related timer

SET CORRMALGOSWITCH:

DraSw itc h=DRA_HSDPA_STATE_TRANS_SWITCH-1 &

DRA_HSUPA_STATE_TRANS_SWITCH-1 &

DRA_PS_BE_STATE_TRANS_SWITCH-1;

Activate the state transition switch in RNC.

SET UESTATETRANSTIMER: BeD2FStateTransTimer=4,

BeF2PStateTransTim er=6, BeH2FStateTransTimer=4,

BeE2FStateTransTimer=4;

Currently Cell_FACH to Cell_PCH is set to 65535 or deactivated.

Recommendation is set to 6s to PCH, and 4s to FACH.

SET PSINACTTIMER: PsInactTmrFor Int=1800, PsInactTmrForBac=1800;

Currently PS Inactive Timer is set to 20s.

Recommendation is set to 1800s or 30 minutes.


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URA_PCH

Early stage of implementation of URA is according to LAC, but when

PCH utilization is high, may need to split the URA.

SET UESTATETRANS: CellReSelectCoun ter=9;

Recommendation is set to 9 times after Cell Updates in Cell_PCH, UE

will transit to URA_PCH. This parameter value may be reduced for faster

URA_PCH state, but PCH utilization will increase, hence need to monitor

PCH utilization and congestion.

SET UESTATETRANSTIMER: CellReSelectTimer=180;

Recommendation is set to 180s.


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Conclusion

PCH is not able to replace FD Feature to solve Smart PhoneSCRI issue.

The benefits of FACH is significant, but the impacts of PCH will

be greater than its advantage.

More optimization and expansion works need to be involved

for none beneficial options.


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Recommendation

FD Feature is only available in RAN 12, no commerciallicense available in RAN 11.

PCH is not recommended to implement in the network

without FD Feature.


12/12


Thank You!

Benefits of FD Feature and Impacts of PCH Trial v1.1

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