1. Re-entry optimization (15.3.10) Document Number: IEEE C802.16m-09/1837 Date Submitted: 2009-08-29 Source: Jin Lee, Ronny Kim, Kiseon Ryu, Jinsam Kwak Email : {jins978,ronnykim,ksryu}@lge.com LG Electronics Re:P802.16m/D1 Venue:IEEE Session#63, Jeju in Korea Base Contribution: Purpose: Discussion and adoption by TGm Notice: This document does not represent the agreed views of the IEEE 802.16 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Motivation When AMS wants to de-register with a current serving ABS, –AMS may request to enter idle mode (Action code 0x01) –AMS may request de-registration (Action code 0x00) For idle mode(Action code 0x01), AMS’s connection information can be retained in a paging controller. Based on the retained information, the AMS can perform fast reentry. ABS should page AMS upon every receiving of paging message. For de-registration (Action code 0x00), AMS’s connection information will not be maintained. However, there’s no consideration for the case, –When AMS de-registers with ABS, –The AMS wants to request resource retention for possible re-entry and –The AMS doesn’t even want to be paged until before re-entry To sum up, if AMS can send notification to ABS in the aforementioned situation, the ABS can retain AMS’s connection information without paging. By enabling it, air interface resource by ineffectual paging can be saved for non-paging preference AMS.

3. Proposal Therefore, we would like to propose ‘resource retain mechanism’ for non paging preference AMS. De-registration_Request_Code (AAI_DREG-REQ) –0x04 : request for AMS deregistration from serving ABS and retention of AMS’s connection information Action code (AAI_DREG-CMD) –0x07 : This option is valid only in response to a AAI_DREG-REQ message with De-Registration Code 0x04: a) to reject retention of AMS’s connection information or b) to allow retention of AMS’s connection information Network Entry TempID (NETID) –NETID is used to identify the AMS during optimized network reentry. The NETID is assigned through AAI_DREG-CMD message and is valid during NE_Resource_Retain_Time. The length of NETID is TBD.

4. Proposal NE_Resource_Retain_Time –NE_Resource_Retain_Time is the duration for AMS’s connection information that will be retained in serving ABS. ABS shall start NE_Resource_Retain_Timer after sending AAI_DREG-CMD (Action code : 0x07b)) Retain information –Retain AMS service and operational information associated with AAI_SBC- REQ/RSP, AAI_PKM-REQ/RSP, AAI_REG-REQ/RSP, network address, AMS state information for all service flows. But STID will be released. Ranging Purpose Indication (AAI_RNG-REQ) – Bit#5 is set to 1, in combination with a previous serving BSID and NETID, it indicates that the AMS is attempting optimized network reentry. TypeLengthValueScope xx2x sec. AAI_REG-RSP

5. Figure – Optimized network re-entry procedure

6. Proposed Texts Remedy 1 – Existing Text [Black], Add [Red] [Insert texts as suggested below in Page 185 Line 27] 15.3.10 Network Entry and Initialization The network re-entry procedure can be optimized by possession of AMS’s connection information upon receiving AMS request. When an AMS performs de-registration, the AMS may send an AAI_DREG-REQ message with action code 0x04 and receive an AAI_DREG-CMD message with Network Entry TempID (NETID). The ABS should retain the AMS’s connection information including AMS’s capabilities and configurations of the service flows, assign a NETID to uniquely identify the AMS attempting optimized network re-entry. The optimized network re-entry shall be initiated by sending an AAI_RNG-REQ message including Ranging Purpose Indication set to ‘optimized network re-entry’, NETID and a previous serving BSID. Upon receiving AAI_RNG-RSP, AMS should conduct following procedure as indicated in AAI_RNG-RSP. When the AMS shares a valid security context with the ABS, the network re-entry procedure can be further shortened without the step of authorizing AMS and key exchange.

7. Proposed Texts Remedy2 – Existing Text [Black], Add [Red] [Insert texts as suggested below in Page71 Line56] 15.2.6.19 AAI_DREG-REQ message The following parameter shall be included in AAI_DREG-REQ message : Management Message Type De-registration_Request_Code –0x00 : AMS deregistration request from ABS and network –0x01 : request for AMS deregistration from serving ABS and initiation of AMS idle mode –0x02 : response for the unsolicited AAI_DREG-CMD message with action code 0x05 by the ABS –0x03 : reject for the unsolicited AAI_DREG-CMD message with action code 0x05 by the ABS. –0x04 : request for AMS deregistration from serving ABS and retention of AMS’s connection information –0x05 – 0x07 : reserved

8. Proposed Texts Remedy3 - Existing Text [Black], Add [Red] [Insert texts as suggested below in Page72 Line42] 15.2.6.20 AAI_DREG-CMD message The following parameter shall be included in AAI_DREG-CMD message: Management message type Action code –0x07 : Reserved This option is valid only in response to a AAI_DREG-REQ message with De-Registration Code 0x04: a) to reject retention of AMS’s connection information or b) to allow retention of AMS’s connection information

9. Proposed Texts Remedy4 – Existing Text [Black], Add [Red] [Insert texts as suggested below in page 73, Line3] 15.2.6.20 AAI_DREG-CMD message When De-registration_Request_Code is 0x04, the following parameters shall be included in the AAI_DREG-CMD message. NETID : Used to identify the AMS during optimized network reentry. The NETID is assigned through AAI_DREG-CMD message and is valid during NE_Resource_Retain_Timer. The length of NETID is TBD.

10. Proposed Texts Remedy5 – Existing Text [Black], Add [Red] [Update Table 682 by inserting texts as suggested below in Page48] Table 682 – parameters for AAI_RNG-REQ NameValueUsage Ranging Purpose Indication If Bit#5 is set to 1, in combination with a previous serving BSID and NETID, it indicates that the AMS is attempting optimized network reentry. Bit#6-7 : reserved NETID NETID which the AMS is assigned for optimized reentry and maintains during NE_Resource_Retain_Time. It shall be included when the AMS performs optimized network re-entry

11. Proposed Texts Remedy6 - Add[Red] [Insert texts as suggested below in page 185, Line38] NE_Resource_Retain_Time –NE_Resource_Retain_Time is the duration for AMS’s connection information that will be retained in serving ABS. ABS shall start NE_Resource_Retain_Timer after sending AAI_DREG-CMD (Action code : 0x07b)) TypeLengthValueScope xx2x sec. AAI_REG-RSP