Transcript IEEE C802.16m-09/1067

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 Cho
Youngsoo Yuk, Sunam Kim,
Kiseon Ryu, Ronny Kim
E-mail : [email protected]
LG Electronics
Kelvin Chou
Yih-Shen Chen, Paul Cheng
E-mail : [email protected]
MediaTek Inc.
Re:
IEEE 802.16m-09/0020 -Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content, on the topic of 802.16m 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 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.
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Outline
• 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 802.16m system.
• Therefore, we propose the design of CDMA Allocation AMAP IE for the 802.16m system.
MCRC of A-MAP IE (1/4)
• 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)
Input Data
CRC generator
Input Data
Cyclic Generator
Polynomial
16-bit Parity
Masking
CRC generator
Cyclic Generator
Polynomial
16-bit Parity
12-bit STID
16-bit Masked Parity (MCRC)
< ABS’s operation generating MCRC for the identified user >
Masking
12-bit RAID
16-bit Masked Parity (MCRC)
< ABS’s operation generating MCRC for the anonymous user >
MCRC of A-MAP IE (2/4)
• 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.
Input Data + CRC
CRC generator
Input Data + CRC
Cyclic Generator
Polynomial
16-bit Parity
Masking
CRC generator
Cyclic Generator
Polynomial
16-bit Parity
12-bit STID
== 0 or != 0
< AMS’s operation only for STID >
Masking
12-bit STID
12-bit RAID
==0 or !=0
< AMS’s operation for STID and RAID >
MCRC of A-MAP IE (3/4)
• 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 (4/4)
Input Data
CRC generator
Input Data
Cyclic Generator
Polynomial
16-bit Parity
Masking
12-bit STID ‘8’ +
Masking indicator
(0b0000)
Masking
12-bit RAID ‘8’ +
Masking indicator
(0b0010)
16-bit Masked Parity (MCRC)
Input Data + CRC
Input Data + CRC
Cyclic Generator
Polynomial
16-bit Parity
Masking
Cyclic Generator
Polynomial
16-bit Parity
16-bit Masked Parity (MCRC)
CRC generator
CRC generator
CRC generator
Cyclic Generator
Polynomial
16-bit Parity
12-bit STID ‘8’ +
Masking indicator
(0b0000)
== 0
< A-MAP IE masked by STID >
Masking
12-bit RAID ‘8’ +
Masking indicator
(0b0010)
== 0
< A-MAP IE masked by RAID for bandwidth request >
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
Syntax
Size(bits)
Notes
CDMA_Allocation_A-MAP IE() {
A-MAP IE type
Resource Assignment Information
4
TBD
MCS
5
Modulation and coding scheme used for the burst
MCRC
16
CRC masked by RA-ID and Masking Indicator
}
Table y2 – Description of the Masking Indicator
Masking Indicator
Descriptions
0b0000
MCRC is masked by 12-bit STID
0b0001
MCRC is masked by 12-bit RAID for Ranging
0b0010
MCRC is masked by 12-bit RAID for Bandwidth request