Band segmentation for S-BCH to increase cell coverage

Document Number: IEEE C802.16m-08/1111r1

Date Submitted: 2008-09-05

Source:Bin-Chul Ihm, Youngsoo Yuk, Sunam Kim and Jeongki Kim Voice: +82-31-450-7187LG Electronics E-mail: {bcihm, sixs, snkim816,chegal}@lge.com

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Venue: PHY: Text, in response to the TGm call for comments 802.16m-08/033 for session 57, Specific Topics “11.7 Downlink Control Structure”

Base Contribution: None

Purpose:Discussion and approval by TGm for the 802.16m SDD

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Robust transmission of SBCH

Since the SDD describes that SBCH carries essential system parameters and system configuration information, SBCH shall be transmitted very robust to satisfy the cell coverage requirement.

SBCH carries sector specific information

Two alternatives for robust transmission of sector specific SBCH QPSK 1/N without band segmentation QPSK 3/N with 3 bands segmentation, each of which has 4.7dB boosted

power per tone

Sector #1 Sector #2 Sector #3

vs

Sector #1 Sector #2 Sector #3

RBs used for SBCH RBs used for data RBs used for Null Tx

Simulation Assumption

Parameters Value

Cell 19 cell (3sector/cell) wrap around

ISD 0.5Km, 1.5Km

BW 5MHz

Sub-channel Localized mode

Channel model

ITU PedB 3km/h

ITU VehA 120Km/h

Mand-mixed(PedB 3km/h(60%), VehA 30Km/h(30%) VehA 120Km/h(10%)

Antenna configuration

2 Tx antennas of 4 lambda spacing with AoD based spatial correlation2 Rx antennas

Tx schemeTurbo code 1/4 QPSK w/ segmentation

Turbo code 1/12 QPSK w/o segmentation

MIMO scheme SFBC

Simulation Results

Coverage @ 0.5Km ISD

Coverage @ 1.5Km ISD

97.89%96.93% 96.32%96.05%

93.60%

91.67%

80%

85%

90%

95%

100%

PedB 3Km/h MAND- MIXED VehA 120Km/h

Segmentation Non- segmentation

98.16%97.54%

96.93%96.58%

93.95%

92.11%

80%

85%

90%

95%

100%

PedB 3Km/h MAND- MIXED VehA 120Km/h

Segmentation Non- segmentation

Observations Coverage means the

portion of users in a sector experiencing lower than 1% PER.

Bands segmentation provides 1.5%~4.8% coverage increase

Text Proposals

[Add the following text at the end of 11.7.2.2.5 Resource allocation in page 61]

Predetermined N PRUs in the first subframe within a superframe are used for transmission of SBCH. SBCH in each sector is transmitted through sector specific PRUs among these N PRUs. The remaining PRUs not used for transmission of SBCH does not transmit any signal.