1. SFH Updating during AMS Unavailable Time Interval (16.2.3.14) Document Number: IEEE C802.16m-09/2917 Date Submitted: 2009-12-31 Source: Chun-Yuan Chiu, Yan-Xiu Zheng, Fang-Ching (Frank) Ren, E-mail:{ccy, zhengyanxiu, frank_ren} ITRI @itri.org.tw Wern-Ho Sheen whsheen@itri.org.tw Chaoyang University of Technology / ITRI Information and Communications Research Laboratories, 195 Chung Hsing Rd., Sec.4 Chu Tung, Hsin Chu, Taiwan 310, R.O.C. * http://standards.ieee.org/faqs/affiliationFAQ.html Re: IEEE 802.16-09/0073, “IEEE 802.16 Working Group Letter Ballot#30b”, Target topic: “IEEE P802.16m/D3, section 16.2.3.14”. Venue: IEEE Session#65, San-Diego Purpose: To be discussed and adopted by TGm for 802.16m LB#30b. 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. SFH Update vs. Scanning To sustain normal network operations, serving ABS broadcasts and adjusts its configuration via system information updating –The critical information is broadcasted via P-SFH/S-SFH IEs in 802.16m To perform handover, serving ABS allocates a time interval for cell scanning –AMS scans the neighboring cells during unavailable time intervals –AMS resumes the normal data transmission during available time intervals

3. SFH Updating during AMS Unavailable Time Interval What if the system information is required to be updated while AMS is in the unavailable interval? –AMS may not get the up-to-date system information ex: BR information, FFR information

4. Current P802.16m/D3 Text System information updating is related to cell-wide/network-wide configuration. It’s not a reasonable design to postpone the SFH updating just because an AMS is performing scanning operation! In P802.16m/D3 text: –An ABS may transmit AAI_SCN-RSP to start AMS scan reporting with or without scanning interval allocation. –If Scan Duration field contains a non-zero value, the system parameters (except cell bar information) which are carried through SFH shall not be changed during whole scanning duration specified in the AAI_SCN- RSP message. –If Scan Duration field contains a non-zero value, scanning interval pattern included in the AAI_SCN-RSP message replaces previous existing scanning interval pattern.

5. Possible Solutions in D3 If SFH will be updated at time t+x and ABS is aware of this oncoming update at time t, –For the AMS that requests scanning after time t and the required unavailable interval involves time t+x, 1.ABS may reject the AMS’s request (Scan Duration field is zero) 2.ABS may reschedule the AMS’s required unavailable interval in AAI_SCN-REQ –For the AMS that had requested scanning before time t, 1.ABS may reschedule the AMS’s unavailable interval by sending AAI_SCN-RSP

6. Scanning and SFH Updating Simultaneously In some cases, AMSs may have ability to do scanning and performing SFH updating simultaneously. –performing intra-frequency preamble measurement –Multi-antenna capability 16m ABSs shall have a way to notice AMS to do scanning and SFH updating simultaneously in these cases when SFH updating is oncoming.

7. Proposed Solution Add an indication bit in AAI_SCN-RSP If SFH will be updated at time t+x and ABS is aware of this oncoming update at time t, –For the AMS that requests scanning after time t and the required unavailable interval involves time t+x, 1.ABS may reject the AMS’s request (Scan Duration field is zero) 2.ABS may reschedule the AMS’s required unavailable interval in AAI_SCN-REQ 3.ABS may notice the AMS to do scanning and SFH updating simultaneously (indication bit is set to ‘1’) –For the AMS that had requested scanning before time t, 1.ABS may reschedule the AMS’s unavailable interval by sending AAI_SCN-RSP 2.ABS may notice the AMS to do scanning and SFH updating simultaneously by sending AAI_SCN-RSP (indication bit is set to ‘1’)

8. Proposed Text Modify Table 686: NameValueUsage Scan duration Duration (in units of AAI subframes) of the requested scanning period. Scan Purpose 0b0: scan BS(s) which is in the list of the AAI_NBR-ADV message 0b1: scan BS(s) which is not in the list of the AAI_NBR-ADV message SFH updating indicator 0b0: nothing 0b1: SFH Update is oncoming and AMS shall do scanning and SFH updating simultaneously Report mode… ……