Dynamic Ranging for HO IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/2875r2 Date Submitted: Source: Inuk Jung, Kiseon Ryu, Ronny Yongho Kim, Voice: Jin Sam Kwak LG * Venue: Call for comments for Letter Ballot #30b Base Contribution: N/A Purpose: For member’s review and adoption into P802.16m_D4 Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

◙Purpose of usage  The dynamic ranging should only be provided for AMS ’ s performing 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 ◙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 ranging opportunity  Dedicated ranging code  Resource allocation of the ranging channel

Proposed Text Remedy #1 On the 80216m_D3, page 165, line 61, add current text in with the proposed text as follows: Text Start Network Reentry CDMA-based HO Ranging Procedure If the serving ABS indicates in AAI_HO-CMD that CDMA-based HO ranging is not omitted by setting CDMA_RN G_FLAG=1 and a dedicated ranging code/opportunity is assigned to the AMS by target ABS, the AMS shall transmit s the dedicated ranging code to the target ABS during network reentry. If a ranging channel is scheduled by the target ABS for handover purpose only, the target 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 interfere nce. Upon reception of the dedicated ranging code and if ranging is successful, the target ABS shall allocate uplink r esources 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 A MS Text End

Remedy #2 On the 80216m_D3, page 61, line 1, add current text in with the proposed text as follows: Text Start AAI_HO-CMD The S-ABS shall send AAI_HO-CMD to initiate the HO procedure, or to acknowledge the AAI_HO-REQ sent by th e AMS. The AAI_HO-CMD message shall include the following parameters: Table 683—Parameters for AAI_HO-CMD message Text End NameValueUsage ……… Dedicated CDMA ranging code/opportunity 5May be included when CDMA_RNG_FLAG=1 Ranging opportunity index3Indicates the index of the allocated ranging opportunity May be included when CDMA_RNG_FLAG=1 Subframe Index3Indicates the subframe index of the allocated ranging opportunity May be included when CDMA_RNG_FLAG=1 Sub-band Index5Indicates the Sub-band index of the allocated ranging opportunity May be included when CDMA_RNG_FLAG=1 Proposed Text

Remedy #3 On the 80216m_D3, page 163, line 12, add current text in with the proposed text as follows: Text Start HO Preparation During 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 t he serving ABS through the AAI_HO-CMD message. The dedicated code is assigned to the AMS until the ‘Ranging Initiation Deadline’ or until the AMS has performed ranging successfully at the target ABS, which ever comes first. The AMS may reuse the pre-assigned dedicate ranging code, and additional dedicated ranging opportunities assigned through the AAI_RNG-ACK, during network re-entry until successful ranging is indicated by AAI_RNG- ACK status ‘success’. If AMS fails to perform ranging before expiration of ‘Ranging Initiation Deadline’ it shall stop using the dedicated code but randomly pick a ranging code if further ranging is necessary. The target ABS shall selec t the dedicated ranging code from the group of codes which are allocated for dedicated handover ranging purpose. Af ter the target ABS sends the selected dedicated ranging code/opportunity to the serving ABS over the backhaul, the s erving ABS shall deliver the dedicated ranging code/opportunity to the AMS in AAI_HO-CMD Text End Proposed Text