Bandwidth Request Indicator IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-08/986r1 Date Submitted: 2008-09-05 Source: Xiaobing Leng, Jimin Liu, Gang Shen, Kaibin Zhang, Dongyao Wang, Shan Jin Voice: 86-21-58541240-8114 Email: Xiaobing.leng@alcatel-sbell.com.cn Alcatel Shanghai Bell 388#, Ningqiao Road, Pudong Jinqiao Shanghai, 201206, P.R. China Venue: [802.16m] [16jm] Session #57, September, 2008 Re: PHY: SDD Session 56 Cleanup; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57 Purpose: To propose a Bandwidth Request Indicator (BRI) scheme which can implicitly indicate the request size 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: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

Background It is defined in IEEE 802.16m-08/003r4 (SDD) to use a quick 3-step (step 1,4 and 5) bandwidth request procedure Bandwidth Request Indicator (BRI) is still not defined for carrying additional bandwidth request information BS MS Bandwidth Request Indicator 1 UL grant for BW-REQ message 2 BW-REQ message 3 BS MS UL grant 4 UL scheduled transmission with optional piggybacked bandwidth request 5

Introduction of the BRI proposal Reserve several ranging/BR slots in random access channel as non-contention based bandwidth request channel BRI is a preassigned ranging code in a special slot of non-contention based bandwidth request channel The ranging code preassignment will keep certain rule to avoid confliction MS may be allocated several BRIs to carry additional bandwidth request information, e.g. Several combined BRIs can indicate different BR size levels Advantages Uniform ranging codes for ranging, contention based BR and non-contention based BR Easy to implement

Non-contention based bandwidth request channel Random access channel for transmitting BRI is divided into Contention based random access channel Non-contention based random access channel Two same ranging codes should not exist in a same BR slot Number of ranging codes in a BR slot should be less than a threshold to guarantee correct code detection N1: Symbol number for a ranging code N2: Subchannel number for ranging code Contention based Ranging/BR opportunity slot 1 2 Empty 3 4 5 6 7 8 N2 subchannels 1 2 N1 OFDMA symbols <N1 OFDMA symbols Non-contention based ranging/BR opportunity slot

UL scheduled transmission with optional piggybacked bandwidth request Combined BRIs Several BRIs can be combined to indicate more bandwidth request information, e.g. 3 BRIs can indicate 8 request sizes The BR size corresponding to each BRI combination is predefined between BS and MS MS can select and send combined BRIs according to current buffer size BRI 1 BRI 2 BRI 3 Request sizes No request 1 Size 1 Size 2 Size 3 Size 4 Size 5 Size 6 Size 7 BS MS Bandwidth Request Indicators (BRIs) 1 UL grant with a special size 4 UL scheduled transmission with optional piggybacked bandwidth request 5 0: MS doesn’t transmit BRI; 1: MS transmits BRI

Proposed Text Change Change the following text in SDD (IEEE 802.16m-08/003r4) section 11.9.2.5 – Bandwidth request channel as indicated Contention based or non-contention based random access is used to transmit a bandwidth request indicator on this control channel. For non-contention based random access, a preassigned ranging code in a special bandwidth request slot represents a bandwidth request indicator. A MS or a connection may be allocated one or several bandwidth request indicators. To support different levels of QoS, the bandwidth request channel provides a mechanism for prioritized bandwidth requests. Inclusion of addition information in a bandwidth request indicator such as bandwidth request size, MS-ID, flow identifier, uplink transmit power report and CINR report is FFS. The random access bandwidth request procedure is described in Figure 35. A 5-step regular procedure (step 1 to 5) or an optional quick access procedure (step 1,4 and 5) may be supported concurrently. Step 2 and 3 are used only in 5-step regular procedure. In step 1, MS sends a bandwidth request indicator or multiple bandwidth request indicators that may indicate information such as MS addressing and/or request size (FFS) and/or uplink transmit power report (FFS), and the BS may allocate uplink grant based on certain policy. Multiple bandwidth request indicators can be combined to indicate the bandwidth request size. The 5-step regular procedure is used independently or as fallback mode for quick access procedure. The MS may piggyback additional BW-REQ information along with user data during uplink transmission (step 5).