Proposed Text on Broadcast Assignment A-MAP IE (16.3.6.5.2)

IEEE 802.16 Presentation Submission Template (Rev. 9)

Document Number:IEEE C802.16m-09/3022

Date Submitted:2009-12-31

Source:Hyunkyu Yu, Yeongmoon Son, Sung-Eun Park, Voice: +82-31-279-4964Hyunjeong Kang, Mihyun Lee E-mail: hk.yu@samsung.com

Samsung Electronics Co., Ltd416 Maetan-3, Suwon 443-770, Korea

Venue:Comments on IEEE P802.16m/D3 for IEEE 802.16 Working Group Letter Ballot Recirc #30bArea: “16.3.6 Downlink control structure”.

Base Contribution:None

Purpose:To be discussed and adopted by the IEEE 802.16 Working Group.

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Intro.

Current Design

• Broadcast assignment A-MAP for broadcast burst allocation

• All broadcast MAC control messages to be transmitted in a AAI subframe shall be included in a broadcast burst.

Need to Decide

• (1) IE contents for Broadcast assignment A-MAP

• (2) Location of Broadcast assignment A-MAP

• (3) Transmission format for Broadcast assignment A-MAP

IE Contents (1/2)

Information Element

• [A-MAP IE Type: 4 bits]

• May not be required if TBCC code rate of Broadcast assignment A-MAP IE is different from that of assignment A-MAP IE.

• Resource index: 11 bits

• MCS (ISizeOffset)

• Recommend implicit signaling

IE Contents (2/2)

MCS

(1) Need to consider both reuse 1 and reuse 3

(2) The lowest code rate of CTC (≈1/12) is enough to meet 5% outage requirement in reuse-1?

Cannot meet requirement in EMD baseline test scenario (Appendix)

(Proposal) use additional code rate of ≈1/24

(3) Explicit or Implicit indication?

(Proposal) implicit method: mapping to S-SFH code rate (not defined in D3)

Location of Broadcast A-A-MAP

(Proposal) Assignment A-MAP

• In primary frequency partition, only one Broadcast A-A-MAP IE is present at the beginning of either group 1 or group 3 in A-A-MAPs, if exist.

HF A-MAP

Assign A-MAP #2

Assign A-MAP #n

...

PC A-MAPNUS A-MAP

Assign A-MAP #1

Non-user-specific

User-specific

Data burst #1

Data burst #2

AAI_TRF-INDAAI_PAG-INDAAI_NBR-ADV

GMH Payload

AAI_TRF-IND

MT Parameters for AAI_TRF-IND

All data traffic and management message are composed of a GMH and a payload.

Broadcast A-A-MAP IE

Text Proposal

[Remedy 1: Add the following text after line 48, page 369, 16.3.6.2.2.4]

----------------------------------------------------- Text Start ----------------------------------------------------

In primary frequency partition, a Broadcast assignment A-MAP IE is present at the beginning of either group 1 or group 3 in assignment A-MAPs, if exist.

----------------------------------------------------- Text End -----------------------------------------------------

Text Proposal

[Remedy 2: Modify the following text in line 16, page 443.]

----------------------------------------------------- Text Start ----------------------------------------------------

16.3.6.5.2.4.13 Broadcast Assignment A-MAP IE…

Table 829—Broadcast Assignment A-MAP IE*

Text Proposal

*A 16 bit CRC is generated based on the contents of the Broadcast Assignment A-MAP IE

The broadcast message signaled by the Broadcast A-MAP IE is always transmitted using SFBC as the MIMO encode format.

Resource Index field is interpreted as in the DL Basic assignment A-MAP IE, except for allocation of size 1 and 2 LRUs. Allocation of size 1 and 2 LRUs is not allowed for broadcast data bursts.

When calculating the burst size of broadcast data burst, ISizeOffset is implicitly indicated based on code rate of S-SFH and frequency partition index as shown in Table yyy.

Table yyy—Burst size of Broadcast data burst

Code rate of S-SFH

ISizeOffset or Burst size (Reuse 1 FP) ISizeOffset (Boosted Reuse 3 FP)

1/12 ISizeOffset = 0 ISizeOffset = 9

1/24Burst size to allocation size mapping is defined in Table zzz

ISizeOffset = 3

Text Proposal

Table zzz—Burst size to allocation size mapping

----------------------------------------------------- Text End -----------------------------------------------------

Allocation size

Burst sizeAllocation

sizeBurst size

Allocation size

Burst sizeAllocation

sizeBurst size

6 6 17 17 44 44 114 114

8 8 19 19 50 50 128 128

9 9 22 22 57 57 144 144

10 10 25 25 64 64 164 164

11 11 27 27 71 71 180 180

12 12 31 31 80 80

13 13 36 36 90 90

15 15 40 40 100 100

Analysis on Code Rate of Broadcast Burst

Appendix

Summary

Method

• LLS curves: Find SNR value (x) at 1% FER

• Geometry distribution: Find SNR value (y) at 5% CDF

• If x>y: outage requirement is NOT satisfied.

• Else (x<=y): outage requirement is satisfied.

Results

• x = -3.5

• Y = -3.7 (EMD baseline), -5.6 (Open rural macro)

• In EMD baseline and Open rural macro, the current lowest code rate CANNOT meet the requirement

Result-1: LLS Performance

In LLS curves, Find SNR value at 1% FER

• Around -3.5 dB

Parameter Value

Bandwidth 10 MHz

MIMO scheme 2x2 SFBC

Sub CH. DRU

Modulation QPSK

FEC CTC

1 LRU 18 x 5

Burst size Code rate # of LRUs

48 (bits) 1/10 3

64 1/10 4

288 9/80 16

0.001

0.01

0.1

1

- 12 - 11 - 10 - 9 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 0

BLE

R

SNR [dB]

PedB- 3 3LRUs PedB- 3 4LRUs PedB- 3 16LRUs

VehA- 120 3LRUs VehA- 120 4LRUs VehA- 120 16LRUs

Result-2: Geometry Distribution

In Geometry distribution, Find SNR value at 5% CDF

Test Scenario SNR@5% (dB)

InH 2

UMi -2.5

UMa -2.8

RMa -1.9

EMD baseline -3.7

Open rural macro(5km-radius)

-5.6

05

10152025303540

-8 -6 -4 -2 0 2 4

CDF

(%)

Geometry (dB)

InH UMiUMa RMaEMD baseline open rural macro (5km radius)