Idle mode modification for the smooth evolution from 16e to 16m Document Number: IEEE S802.16m-10_0253r1 Date Submitted: 2010-03-12 Source: Lin Chen, Feng.

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Idle mode modification for the smooth evolution from 16e to 16m Document Number: IEEE S802.16m-10_0253r1 Date Submitted: Source: Lin Chen, Feng Xie, Yang Liu, Yuqin Chen {chen.lin23, xie.feng2, liu.yang8, ZTE Corporation Venue: IEEE Session#66 at Orlando, Florida, USA. Base Contribution: This is base contribution. Purpose: Propose to be discussed and adopted by TGm for the use in Project m/D5 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.

Deployment requirement: Smooth evolution from 16e to 16m network SHOULD be supported. –The first release of Wimax profile supporting 16m will be lack of network support. –That is, the Rel1.x ASN-GW is used for not only the 16e BS/MS but also the 16m ABS/AMS. Motivation

The first phase deployment for WiMAX (from 16e to 16m ) The awareness of legacy ASN-GW may be configured for the ABS.

The impact to the Idle mode The ABS has to bridge the gap between the legacy ASN-GW and the 16m AMS/ABS. The major differences include: –Identification 16m use 10 bit DID together with paging cycle, paging offset to identify the AMS within the paging group, 16e use the 24 bit MAC address hash to identify the AMS. –Paging groups: 16m AMS could belong to multiple paging groups 16e AMS could only belong to one paging groups –Paging listening interval: 16m use the number of superframe to calculate the start of the paging listening interval 16e use the number of frame to calculate the start of the paging listening interval –Emergency alert 16m AMS support the paging for emergency indication 16e does not support it. –DCR 16m AMS may terminate the idle mode due to the entering of DCR mode 16e AMS does not support it.

Detailed Idle mode Comparison between 16e and 16m

Idle mode for smooth evolution analysis (1) The DID used to identify an AMS during paging in 16m is generally regarded as being assigned by the paging controller. Since the legacy ASN-GW does not support the updated paging controller, the DID could not be assigned by the paging controller any more. The paging controller in the legacy ASN-GW regard all the paging groups as the same type, that is, it does not know which paging groups are for 16e BS and which paging groups are for 16m ABS. Since the numbering of frame and synchronization is different for 16e and 16m, for the ease of processing, when design the paging group,16e BS and mixed mode ABS may be in the same paging group, 16m only ABS and mixed mode ABS may be in the same paging group. The 16e BS and 16m only ABS should not be in the same paging group.

Idle mode for smooth evolution analysis (2) It is natural to consider that the idle initialization and the paging identification should happen within the same zone. That is, the AMS only listens to the same zone that it enter the idle mode until the paging group changes. The emergency alert and DCR mode is not supported in the legacy ASN-GW. The legacy ASN-GW only assign one paging group to one AMS.

Summarized idle mode processing category Idle initialization in LZone and paged in LZone Idle initialization in MZone and paged in MZone

Possible Solution Paging group –16e BS and mixed mode ABS (LZone) could be in the same paging group, 16m only ABS and mixed mode ABS (MZone) could be in the same paging group. The 16e BS and 16m only ABS should not be in the same paging group. –The PGID for the LZone BS or MZone ABS should be differentiated. For example, the first MSB of PGID could be used to distinguish the paging group from LZone or MZone. ABS side –ABS sends the Identifier type indication (1 bit) in the SFH. Identifier type = 1: use advanced paging identifier, DID. Identifier type = 0: use legacy paging identifier, mac address hash –The AAI_PAG-ADV message contains the DID or mac address hash according to the paging identifier type indication. –The ABS decides whether to page the AMS in LZone or MZone according to the PGID that the AMS belongs to. –Since the paging offsets and paging cycles defined in paging controller of legacy ASN is in terms of frame whereas 16m specification is in terms of superframe, the ABS should do a mapping between these parameters for the paging groups of MZone. AMS side –If the AMS receive the Identifier type =1, it parse the DID from the AAI_DREG-RSP and the AAI_PAG-ADV message and use the DID to identify whether it is paged or not. –If the AMS receive the Identifier type =0, it directly use the mac address hash to identify whether it is paged or not.

Advantage of this solution Works in each smooth evolution phase The benefit of lower DID overhead is maintained in 16m when advanced paging identifier is utilized. –DID: 10 bit –MAC address hash: 24 bit The paging identifier type indication could be further reused with the network entry identifier type indication.

Proposed Text [ Adopt the following modification in section “Broadcast paging message ”] Table 767 –Parameters for AAI_PAG-ADV message format NameValueUsage Paging_Group_IDs bitmapEach bit in the bitmap indicates: 0: the paging information for the corresponding PGID is not included1: the paging informationfor the corresponding PGID is included The size of Paging_Group_IDs bitmap equals to the number of paging group IDs in the PGID_Info message. Num_AMSsNumber of paged AMSs in a particular paging group For each non-zero bit in the Paging_Group_IDs bitmap, there shall be one Num_AMSs. Deregistration Identifier0~1023Deregistration Identifier and Paging Cycle are used to iden tify each paged AMS when advanced identifier is used. MAC address hash 24bit MAC address hash are used to identify each paged AMS when legacy identifier is used.

Proposed Text [ Adopt the following modification in section “S-SFH IE ”] Table 813 – S-SFH SP3 IE format Bandwidth request backoff start4Initial backoff window size for contention BRs, expressed as a power of 2. Values of n range 0-15 (the highest order bits shall be unused and set to 0) Bandwidth request backoff end4Final backoff window size for contention BRs, expressed as a power of 2. Values of n range 0-15 fpPowerConfig4The power boosting/de-boosting values are listed in Table 814 Identifier type Indication11: advanced identifier shall be used 0: legacy identifier shall be used ReservedTBD }

Proposed Text When the action code is set to 0x05 or 0x07, the following parameters shall be included in AAI_DREG-RSP message. Only if the advanced paging identifier is indicated could the Deregistration identifier be included. Paging information Paging cycle Paging offset (4bits) 0x00: 0 superframe 0x01: 8 superframes 0x02: 16 superframes 0x03: 32 superframes 0x04-0x0f: reserved Paging group ID Paging controller ID Idle Mode Retain Information Deregistration Identifier When the action code is set to 0x08, the following parameters shall be included in AAI_DREG-RSP message. Only if the advanced paging identifier is indicated could the Deregistration identifier be included. Idle Mode Retain Information Deregistration identifier (DID) [Adopt the following modification in line 53 of page 102 of section “AAI_DREG-RSP message”] [Adopt the following modification in line 17 of page 103 of section “AAI_DREG-RSP message”]

Proposed Text To adapt to the smooth evolution, the ABS may use advanced identifier or legacy identifier for paging AMS. The identifier type shall be indicated in the S-SFH. For example, if the advanced identifier is indicated, the ABS shall contain the DID in the AAI_DREG-RSP message and use the DID in the AAI_PAG-ADV message for paging AMS. On the other hand, if the legacy identifier is indicated, the ABS shall use the MAC address hash for paging AMS. When the AMS receive the identifier indication bit in S-SFH, it shall use the corresponding identifier to check whether it is paged or not. The LZone and MZone of ABS should be divided into different paging groups and could not be mixed into one paging group. Through the differentiated PGID of the paging groups that the AMS belongs to, the ABS decides where to page the AMS, in LZone or MZone. On the other hand, the paging offsets and paging cycles defined in paging controller of legacy ASN is in terms of frame whereas WirelessMAN-OFDMA Advanced system is in terms of superframe, the ABS should do a mapping between these parameters for the paging groups composed by the MZone of ABS. [Adopt the following modification in line 61 of page 306 of section “Idle mode”]