Document Number: IEEE C802.16m-09/0147 Date Submitted:

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Presentation transcript:

Overhead Reduction for the Identification of Anonymous Ranging Response Document Number: IEEE C802.16m-09/0147 Date Submitted: 2009-01-05 Source: Kelvin Chou Kelvin.Chou@mediatek.com Yih-Shen Chen Yihshen.Chen@mediatek.com I-Kang Fu IK.Fu@mediatek.com Paul Cheng Paul.Cheng@mediatek.com MediaTek Inc. No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park, Hsinchu, Taiwan 300, R.O.C. Venue: Comment on IEEE 802.16m System Description Document: On Session 10.8 Network Entry Base Contribution: This is the base contribution Purpose: To be discussed and adopted by TGm for the 802.16m SDD

Problem Description: Overhead in CDMA Initial / Periodic Ranging (1/2) Procedures for the OFDMA-based ranging The MS chooses randomly a Ranging Slot in a single frame The MS chooses randomly a Ranging Code and sends it to the BS (as a CDMA code) Upon successfully receiving a CDMA ranging code, the BS broadcast a ranging response message with the following properties: Ranging Code index (8 bits) Frame number (8 bits) Time symbol reference (10 bits) Subchannel reference (6 bits) Shared knowledge between MS and BS Ranging / BR opportunities OFDMA-specific ranging response message encoding

Problem Description: Overhead in CDMA Initial / Periodic Ranging (2/2) Shared knowledge is exchanged every time to identify anonymous RNG-RSP and anonymous bandwidth allocation in both initial ranging and periodic ranging Anonymous RNG-RSP Anonymous bandwidth allocation

Proposed Solution: Hash Identity for Anonymous RNG-RSP / BW Allocation Shared knowledge needs not be exchanged over the air Can be verified by a shorter message derived from the shared knowledge Let A be frame number (8 bits) B be ranging code index (8 bits) C be subchannel reference (6 bits) D be time reference (10 bits) Encoding at BS Decoding at MS (10 bits) A’(10 bits) (10 bits) (10 bits) BS sends A’ (10 bits) instead of (A+B+C+D) to MS Saved 22 bits

Performance Analysis: Hash Identity Collision (1/2) Probability of hash identity collision Less than 1% (5 users, 10-bit key) Independent to the number of hash keys (number of XOR operations) The more shared information, the more bits we save Average number of contention users in a frame falls with this region

Performance Analysis: Hash Identity Collision (2/2) Probability of hash identity collision Less than 1% (5 users, 10-bit key) Drops exponentially as key length increases

Performance Analysis: Hash Identity Collision Handling Hash identity collision leads to collision of ranging request messages Identical to the case of ranging code collision BS may broadcast ranging status report to notify MSs and to expedite the start of the next round ranging Ranging code collision handling Hash collision handling

SDD Text Proposal [Add the following blue text to the end of 10.8, Page 56, line 3.] 10.8 Network Entry Network entry is the procedure by which an AMS finds and establishes a connection with the network. The network entry has the following steps: – AMS synchronizes with the ABS via synchronization channel (SCH). – AMS obtains necessary information e.g. ABS ID, NSP ID for initial network entry, and performs network selection. – AMS starts ranging process. – Authentication and registration process. – AMS enters 16m network and sets up service flows. Neighbour BSs search is based on the same downlink signals as initial network search (eg: preamble) except some information can be provided by serving ABS (eg: NBR-ADV). Network re-entry from such procedures as handover, idle mode exit and so on, is based on initial network entry procedure with certain optimization procedures. The ABS shall respond to the AMS’ initial ranging code transmission by broadcasting a status indication message (e.g.: Decoding Status Bitmap) in a following predefined DL frame/subframe. The initial ranging related messages (e.g.: RNG-RSP and BW Grant) can be embedded linked to the corresponding bit of the status indication message to reduce overhead. Upon successfully receiving a CDMA ranging code, the ABS broadcasts a ranging response message that advertises the hash identity derived from the received ranging code and the ranging slot information (OFDMA symbol number, subchannel, etc.) where the CDMA ranging code has been identified. This hash identity is used by the SS that sent the CDMA ranging code to identify the ranging response message that corresponds to its ranging request.