1. Proposed PHY Structure for the IEEE 802.16m Bandwidth Request Channel
Document Number: C80216m-09/0142
Date Submitted:
Source: Yuan Zhu
Xiangying Yang
Qinghua Li
Changlong Xu
Jong-kae Fwu
Hujun Yin
Intel Corporation
Re: m-08/052, Call for Comments on m SDD (802.16m-08/003r6), Section
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Base Contribution: N/A
Purpose: Discussion and adoption by TGm
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2. Overview In this contribution, we update our BRCH PHY structure design
A 4×6 tile structure is proposed to support legacy mode operation
A 6×6 tile size is proposed for green field operation
3-step quick access is supported for green field (6×6 tile size) operation with 5-step access as fall back
The standard 5-step access (4×6 tile size) is always used for legacy mode of operation

3. PHY structure for green field
6×6 tile size:
Preamble:Data = 2:1
24 orthogonal sequences, e.g. DFT sequences
12 bit message, block code (36, 12) and BPSK
Non-coherent detection for preambles
Coherent detection for message

4. PHY structure for legacy mode
4×6 tile size:
Only transmit preambles
24 orthogonal sequences, e.g. DFT sequences

5. MAC Aspects Contention based access
One BRCH carries 16 bits in total to convey MS ID and Bandwidth Request
4 bits is carried in preamble index
12 bits is carried in message part
Enables 3-step quick access for 512 VoIP users, each user is able to carry 7 bits in quick access

6. Simulation Parameters
Parameters Names
Parameters Values
Preamble:Data
2:1
Preamble Sequence
DFT(24)
Data Encoding
Linear Block Code (36, 12)
Data Modulation
BPSK
Data Decoding ML
Preamble Detection Threshold for FA0.1%
Only consider noise caused FA
Data BLER
Count misdetected preambles as error message. Count unreliable decoded message as error message. Only decode message for detected preambles
Antenna
1Tx/2Rx

7. PB3 results 1% working point Preamble: -4.4dB Message 1User: 0.5dB

8. VA60 results 1% working point Preamble: -3.8dB Message 1User: 1dB

9. VA120 results 1% working point Preamble: -3.8dB Message 1User: 1dB

10. Conclusion
For green field mode of operation, enable 3-step quick access and fall back to 5-step access if 3-step procedure is not successful.
For legacy mode of operation, always use the standard 5-step access, similar to e.
Adopt the tile structures in page 3 and page 4 for the IEEE m BRCH for green field and legacy operation respectively.