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Title: Comments on CDMA2000 1x Rev E One-Bit-Fix in SPM. Source: Contact: Yuezheng Wang yfang@zteusa.com , yu.yuanfang , lu.ting , wangyzh@gsta.com zhao.xiaowu@zte.com.cn .

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Title: Comments on CDMA2000 1x Rev E One-Bit-Fix in SPM

Source:

Contact: Yuezheng Wang yfang@zteusa.com, yu.yuanfang, lu.ting,

wangyzh@gsta.com zhao.xiaowu@zte.com.cn

Abstract:This contribution proposes comments on the one-bit-fix in SPM of cdma2000 Rev E to solve a particular industry issue.

Recommendation:Review and Adopt

background
Background
  • Background
    • According to CDMA2000 1x Rev E Implementation Guide Line, the Rev E capable mobile station can send an ORM or PRM or STRPM with REV_FCH_RC_MAP and FOR_FCH_RC_MAP to indicate its RC8 and RC11/12 capability.
    • C22-20101206-009 reports there is a “RC bug” in CDMA2000 1x Rev E Implementation Guide: in some deployment, the legacy 1x base stations cannot recognize the size-increased FOR_FCH_RC_MAP or REV_FCH_RC_MAP in ORM, PRM or STRPM, and cause MO and MT call failure.
    • C22-20110314-005 proposed an “One-Bit Fix” in SPM. i.e. using one bit indication in SPM to indicate the base station’s RC capability. However this “One-Bit Fix” added in SPM will cause other issues.
comments
Comments
  • Handoff Issue
    • When a Rev E capable mobile station sets up a call with a legacy 1x base station, it may use a legacy RC (such as RC1 or 3) for the voice call.
    • According to the proposed “One-Bit-Fix” in C.S0005 Rev E spec and Implementation Guideline, the Rev E capable mobile station shall not report its Rev E capability in RC_MAPs.
    • When this Rev E capable mobile station moves to the boundary of 1x Rev E base stations, it may trigger handoff to a Rev E base station. The target Rev E base station has to use the legacy RC for the handoff and remains it for the call.
    • The Rev E mobile station follows the “One-Bit Fix” indication in SPM to report its RC capability.
    • The “One-Bit-Fix” indication is only allowed to transmit over PCH. The mobile station cannot update the base station RC capability information during the call. Therefore, the mobile station will never report its Rev E RC capability if the base station sends a STRQM after handoff. The Rev E base station has no way to upgrade the voice call to RC8/11.
rev e ms handoff from legacy 1x to rev e bs
Rev E MS Handoff from Legacy 1x to Rev E BS

Rev E MS

Legacy BS

MSCs

Rev E BS

1. Voice Traffic (RC3, SO3)

2. Handoff Required (RC3, SO3)

3. Handoff Request (RC3, SO3)

4. Handoff Request Ack (SO3)

5. Handoff Command (SO3)

6. UHDM (RC3, SO3)

7. MS Ack Order

8. Handoff Commenced

9. Reverse Traffic Channel Preamble or Frame

10. BS Ack Order

11. Handoff Complete Message

12. Voice Traffic (RC3, SO3)

13. STRQM

14. STRPM (RC3, SO3)

comments1
Comments
  • Impact on Rev E System Performance
    • Rev E system could achieve up to 4 times performance improvement from the legacy 1x system. But the real performance improvement depends operators’ deployment.
      • Operator may only deploy Rev E base stations in some high population density area for capacity improvement and cost reduction.
      • Consequently, the Rev E base stations may be surrounded by legacy 1x base stations which may not have the particular industry issue.
    • Now the “One-Bit-Fix” in SPM forces all the Rev E base stations adjacent to any kind of legacy 1x base stations (even they do not have the particular industry issue currently) to face the handoff issue and cannot upgrade the voice call to using RC8/11.
comments2
Comments
  • Impact on Rev E System Performance (continued)

Any

Legacy 1x

Rev E BS

Any

Legacy 1x

Rev E BS

Rev E BS

MS handoff to Rev E

From any legacy 1x

suggestions
Suggestions
  • One Bit Indication in Other Messages
    • Add the one-bit indication in the ITSPM and STRQM to indicate base station capability
rev e ms handoff from legacy 1x to rev e bs1
Rev E MS Handoff from Legacy 1x to Rev E BS

Rev E MS

Legacy BS

MSCs

Rev E BS

1. Voice Traffic (RC3, SO3)

2. Handoff Required (RC3, SO3)

3. Handoff Request (RC3, SO3)

4. Handoff Request Ack (SO3)

5. Handoff Command (SO3)

6. UHDM (RC3, SO3)

7. MS Ack Order

8. Handoff Commenced

9. Reverse Traffic Channel Preamble or Frame

10. BS Ack Order

11. Handoff Complete Message

12. Voice Traffic (RC3, SO3)

13. ITSPM (BS_EXT_RC_IND)

14. STRQM (BS_EXT_RC_IND)

15. STRPM (RC8/11, SO73)

benefits
Benefits
  • The “One Bit Indication in Other Messages ” proposal gives the target Rev E base station ability to trigger mobile station reporting its Rev E RC capability after handoff. Then the target base station could have the chance to upgrade the voice call to RC8/11 based on its own requirement. Such upgrade will help to achieve voice capacity improvement for Rev E base station.