Design of the CDMA Allocation A-MAP IE for Bandwidth Request Procedure Document Number: IEEE C802.16m-09/1067 Date Submitted: 2009-04-30 Source: Heejeong.

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Design of the CDMA Allocation A-MAP IE for Bandwidth Request Procedure Document Number: IEEE C802.16m-09/1067 Date Submitted: Source: Heejeong Cho Youngsoo Yuk, Sunam Kim, Kiseon Ryu, Ronny Kim LG Electronics Kelvin Chou Yih-Shen Chen, Paul Cheng MediaTek Inc. Re: IEEE m-09/0020 -Call for Contributions on Project m Amendment Working Document (AWD) Content, on the topic of m AWD – Bandwidth Request Procedure Purpose: For discussion and adoption in section 15.2.y.2 Grant of the IEEE C802.16m-09/0846 – Connection Management and QoS DG AWD text proposal 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.

In the legacy system, CDMA Allocation A-MAP IE is used for allocation of bandwidth to a user that requested bandwidth using a ranging code. Ranging codes are classified into 4 subsets according to the purpose. –For initial ranging –For handover ranging –For periodic ranging –For bandwidth request However, code design for bandwidth request is different from that for ranging in the m system. Therefore, we propose the design of CDMA Allocation A- MAP IE for the m system. Outline

MCRC of A-MAP IE (1/4) Input Data Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit STID 16-bit Masked Parity (MCRC) ABS’s operation –ABS appends a 16-bit CRC to the data burst using the cyclic generator polynomial. –ABS masks 16-bit CRC by Station ID for the identified user or Random Access ID for the anonymous user. RAID is generated by random access attributes (e.g., time/frequency index at which the code was transmitted, code index sent by the AMS) 12-bit RAID Input Data Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 16-bit Masked Parity (MCRC)

AMS’s operation –AMS calculates the 16-bit CRC in the received A-MAP IE. –AMS masks 16-bit CRC by STID –Additionally, AMS masks 16-bit CRC by RAID only if it performed random access procedure and waits for a response. –If the output is zero, AMS reads the rest of fields in the A-MAP IE. Otherwise, AMS ignores the A-MAP IE. MCRC of A-MAP IE (2/4) Input Data + CRC Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit STID == 0 or != 0 12-bit STID 12-bit RAID Input Data + CRC Cyclic Generator Polynomial CRC generator 16-bit Parity Masking ==0 or !=0

However, some AMSs can recognize that the A-MAP IE is for own and then will perform a corresponding procedure in the following cases; –AMS’s STID is the same as other AMS’s RAID –RAID of a AMS which transmitted ranging code is the same as RAID of another AMS which transmitted bandwidth request code To solve this ambiguous process, – ABS shall mask 16-bit CRC by 12-bit STID and Masking Indicator or 12-bit RAID and Masking Indicator. –Masking indicator 0b0000 indicates that the CRC was masked by 12-bit STID. 0b0001 indicates that the CRC was masked by 12-bit RAID for Ranging. 0b0010 indicates that the CRC was masked by 12-bit RAID for Bandwidth request. MCRC of A-MAP IE (3/4)

MCRC of A-MAP IE (4/4) Input Data Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit STID ‘8’ + Masking indicator (0b0000) 16-bit Masked Parity (MCRC) Input Data + CRC Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit STID ‘8’ + Masking indicator (0b0000) == 0 Input Data Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit RAID ‘8’ + Masking indicator (0b0010) 16-bit Masked Parity (MCRC) Input Data + CRC Cyclic Generator Polynomial CRC generator 16-bit Parity Masking 12-bit RAID ‘8’ + Masking indicator (0b0010) == 0

Proposed text 15.2.y.2 Grant In the bandwidth request procedure, the grant for BW-REQ message is allocated by CDMA Allocation A-MAP IE, which is shown in Table yy. CDMA Allocation A-MAP IE is used for allocation of bandwidth to a user that requested bandwidth using a ranging code or BR code. AMS decodes the IE and checks the MCRC field by its specific 12-bit RA-ID and 4-bit Masking Indicator. The RA-ID is calculated by a hash function with the AMS’ random access attributes (i.e., frame number index, sub-frame number index, opportunity index and code index). Masking indicator indicates the identifier used for CRC masking, as shown in Table y2. Table yy – CDMA Allocation A-MAP IE format Table y2 – Description of the Masking Indicator SyntaxSize(bits)Notes CDMA_Allocation_A-MAP IE() { A-MAP IE type4 Resource Assignment InformationTBD MCS5Modulation and coding scheme used for the burst MCRC16CRC masked by RA-ID and Masking Indicator } Masking IndicatorDescriptions 0b0000MCRC is masked by 12-bit STID 0b0001MCRC is masked by 12-bit RAID for Ranging 0b0010MCRC is masked by 12-bit RAID for Bandwidth request