Dynamic Ranging for HO

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

IEEE S802.16m-09/2875r6Date Submitted:

2009-12-30. Source:

Inuk Jung, Kiseon Ryu, Ronny Yongho Kim, Voice: +82-31-450-1856Jin Sam KwakLG Electronics E-mail: inuk.jung@lge.com*<http://standards.ieee.org/faqs/affiliationFAQ.html>

Venue:Call for comments for Letter Ballot #30b

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Purpose:For member’s review and adoption into P802.16m_D4

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◙ Purpose of usage The dynamic ranging should only be provided for AMS’s performin

g coordinated HO

◙ In case of missing A-MAP, to allow AMS to be able to perform dedicated ranging, the ranging opportunity information shall be provided during the HO preparation via AAI_HO-CMD Not only ranging opportunity, but also ranging channel information

need to be informed

Problem definition and Motivation

◙ Allocating dynamic ranging opportunity/channel Provide following information

• Opportunity index of allocated ranging opportunity • Dedicated ranging code• Resource allocation of the ranging channel

All such information is conveyed in AAI_HO-CMD message

◙ Type of Dynamic Ranging Common usage: The allocated ranging information in AAI_HO-CMD may

be used commonly (non-dedicated). Same information as broadcasted in SFH’s SPx (i.e. periodic ranging region)

Dedicated usage: It may be assigned to per user or a per group of users. (i.e. a-periodic ranging region. Not broadcasted to users through SFH)

◙ Hence, this is only for coordinated HO Benefits are less overhead for conveying ranging information in A-MAP Also, ranging performed in actual dedicated style

Dynamic Ranging Usage

Dynamic Ranging Procedure

Data exchange

AAI-HO-REQ

AAI_HO-CMD(Dynamic ranging channel information)

Perform ranging based on the given ranging information in AAI_HO-CMD message

AAI_RNG-RSP

SBSAMS2

HO-REQ

HO-RSP(Dyanmic Ranging information)

TBS

Data exchange

◙ The T-BS informs S-BS about its current dynamic ranging status

◙ S-BS informs AMSs performing coordinated HO about T-BS’s dynamic ranging configuration through AAI_HO-CMD which contains parameters as follows: Opportunity index of allocated rangi

ng opportunity Dedicated ranging code Resource allocation of the ranging c

hannel

Proposed Text

Remedy #1On the 80216m_D3, page 165, line 61, add current text in 16.2.6.3.5.1 with the proposed text as follows:-------------------------------------------Text Start -------------------------------------16.2.6.3.5 Network Reentry16.2.6.3.5.1 CDMA-based HO Ranging ProcedureIf the serving ABS indicates in AAI_HO-CMD that CDMA-based HO ranging is not omitted by setting CDMA_RNG_FLAG=1 and a dedicated ranging code/opportunity is assigned to the AMS by target ABS, the AMS shall transmits the dedicated ranging code to the target ABS during network reentry. A serving ABS may schedule a ranging channel for handover purpose only if Ranging channel allocation periodicity in S-SFH SP1 is not set to 0 (i.e., every frame). If a ranging channel is scheduled by the target ABS for handover purpose only, the serving ABS shall also inform the AMS about the resource allocation of the ranging channel, and the ranging opportunity index where the ranging opportunity is located via the AAI_HO-CMD message. In such case, the AMS should use that ranging channel in order to avoid excessive multiple access interference. Upon reception of the dedicated ranging code and if ranging is successful, the target ABS shall allocate uplink resources for AMS to send AAI_RNG-REQ message and/or UL data. If the target ABS does not receive the dedicated ranging code within Ranging_Initiation_Deadline Timer, the target ABS shall discard the pre-assigned STID of the AMS. -------------------------------------------Text End -------------------------------------

Remedy #2On the 80216m_D3, page 61, line 1, add current text in 16.2.3.11 with the proposed text as follows:-------------------------------------------Text Start -------------------------------------16.2.3.11 AAI_HO-CMDThe S-ABS shall send AAI_HO-CMD to initiate the HO procedure, or to acknowledge the AAI_HO-REQ sent by the AMS. The AAI_HO-CMD message shall include the following parameters:

Table 683—Parameters for AAI_HO-CMD message

-------------------------------------------Text End -------------------------------------

Name Value Usage

Dedicated Ranging Code Flag 1 If set to 0, it indicates that no dedicated ranging code is provided. If set to 1, it indicates that no dedicated ranging code is provided. May be included when CDMA_RNG_FLAG=1

Dedicated Ranging Opportunity Flag

1 If set to 0, it indicates that no dedicated ranging opprotunity is provided. If set to 1, it indicates that no dedicated ranging opportunity is provided. May be included when CDMA_RNG_FLAG=1

Dedicated CDMA ranging code/opportunity

5 Shall be included when Dedicated Ranging Code Flag

=1

Ranging opportunity index 3 Indicates the index of the allocated ranging opportunity

Shall be included when Dedicated Ranging Code Flag=1

Subframe Index 3 Indicates the subframe index of the allocated ranging opportunity

Shall be included when Dedicated Ranging Code Flag=1

Proposed Text

Remedy #3On the 80216m_D3, page 163, line 12, add current text in 16.2.6.3.3 with the proposed text as follows:-------------------------------------------Text Start -------------------------------------16.2.6.3.3 HO PreparationDuring HO preparation phase, the serving ABS communicates with target ABS(s) selected for HO. The target ABS may obtain AMS information from the serving ABS via backbone network for HO optimization.During HO preparation phase, the target ABS may allocate a dedicated ranging code or opportunity to the AMS via the serving ABS through the AAI_HO-CMD message, indicated by both Dedicated_Ranging_Code_Flag and Dedicated_Ranging_Opportunity_Flag. The dedicated code and opportunity is assigned to the AMS until the Ranging Initiation Deadline. The AMS may reuse the pre-assigned dedicate ranging code and opportunity during network re-entry. If AMS fails to perform ranging before expiration of Ranging Initiation Deadline it shall stop using the dedicated code and opportunity but randomly pick a ranging code if further ranging is necessary. The target ABS shall select the dedicated ranging code from the group of codes which are allocated for dedicated handover ranging purpose. After the target ABS sends the selected dedicated ranging code/opportunity to the serving ABS over the backhaul, the serving ABS shall deliver the dedicated ranging code/opportunity to the AMS in AAI_HO-CMD.

-------------------------------------------Text End -------------------------------------

Proposed Text