IEEE 802 16 m08374 Project IEEE 802 16

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IEEE 802. 16 m-08/374 Project IEEE 802. 16 Broadband Wireless Access Working Group <http:

IEEE 802. 16 m-08/374 Project IEEE 802. 16 Broadband Wireless Access Working Group <http: //ieee 802. org/16> Title Network Coordinated Beamforming Date Submitted 2008 -05 -06 Source(s) Choong Il Yeh, Young Seok Song, Seung Joon Lee, Byung -Jae Kwak, Jihyung Kim, Wooram Shin, Dong Seung Kwon ETRI 161 Gajeong-dong Yuseong-gu, Taejeon 305 -700, Korea Re: IEEE 802. 16 m-08/016 r 1: Call for Contributions on Project 802. 16 m System Description Document (SDD) (2008 -03 -20), Downlink MIMO schemes. Abstract In order to improve spectral efficiency, this contribution proposes network coordinated beamforming focusing on downlink dedicated/control channels. Purpose Adoption of proposed text into SDD Notice This document does not represent the agreed views of the IEEE 802. 16 Working Group or any of its subgroups. It represents only 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 802. 16. Patent Policy The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat>. Voice: +82 42 860 4895 (Choong Il Yeh) +82 42 860 5936 (Dong Seung Kwon) E-mail: [email protected] re. kr (Choong Il Yeh) [email protected] re. kr ((Dong Seung Kwon) 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. 1

IEEE 802. 16 m-08/374 CONTENTS ¦ ¦ Rationale Mechanism of Network Coordinated BF ¡

IEEE 802. 16 m-08/374 CONTENTS ¦ ¦ Rationale Mechanism of Network Coordinated BF ¡ ¡ ¦ ¦ Measurement Feedback MS location recognition by network Network coordinated BF associated with FFR Advantages Text Proposals -2 -

IEEE 802. 16 m-08/374 Rationale ¦ Antenna Configuration ¡ ¡ ¦ Target Channels ¡

IEEE 802. 16 m-08/374 Rationale ¦ Antenna Configuration ¡ ¡ ¦ Target Channels ¡ ¡ ¦ Narrow spacing (~0. 5) multiple transmit antennas (array antenna) Wide spacing (> 4 l) multiple transmit antennas Downlink dedicated data channels Downlink dedicated control channels Purposes ¡ ¡ ¡ To improve cell-edge performance To reduce feedback overhead To reduce pilot overhead -3 -

IEEE 802. 16 m-08/374 Mechanism of Network Coordinated BF ¦ ¦ Measurements & Feedback

IEEE 802. 16 m-08/374 Mechanism of Network Coordinated BF ¦ ¦ Measurements & Feedback by MSs ¡ CINR ¡ Preferred beam index (n) ¡ Cell ID Coordinated BF by Network Cooperation ¡ ¡ ¡ BSs are sharing feedback information (measurements) from MSs via network interface. Network recognizes user (MS) locations in the network Coordinated BF by network cooperation -4 -

IEEE 802. 16 m-08/374 MS Location Recognition & Network Coordinated BF ¦ User Location

IEEE 802. 16 m-08/374 MS Location Recognition & Network Coordinated BF ¦ User Location Recognition by Network using Feedback Parameters ¡ ¡ ¦ MS 1: High CINR, Preferred beam index 7, Cell ID 1 MS 2: Low CINR, Preferred beam index 6, Cell ID 3 Network Coordinated BF ¡ ¡ To mitigates inter-cell interference To obtain macro diversity -5 -

Suitable Antenna Configuration for Network Coordinated BF ¦ High CINR Users Group (Cell center

Suitable Antenna Configuration for Network Coordinated BF ¦ High CINR Users Group (Cell center region) ¡ Multiple transmit antennas with wide spacing (Antenna. Spacing > 4 l) • • ¡ Space Division Multiple Access (SDMA) Low CINR Users Group (Cell edge region) ¡ Narrow antenna spacing (0. 5 l) • • ¦ Multiuser MIMO (MU-MIMO) Spatial Multiplexing (SM) Array antenna with narrow spacing (Antenna. Spacing 0. 5 l) • ¦ IEEE 802. 16 m-08/374 BF and Macro diversity gain by Network cooperation Inter-cell interference mitigation by arranging beams using the same spectrum from neighboring cells not to collide Preference for Antenna Configuration ¡ High CINR Cell Center Region • • ¡ Urban: Wide space (rich scattering) Rural: Narrow space (LOS) Low CINR Cell Edge Region • Narrow space for both urban & rural -6 -

IEEE 802. 16 m-08/374 Network Coordinated BF & FFR ¦ FFR Group 1 for

IEEE 802. 16 m-08/374 Network Coordinated BF & FFR ¦ FFR Group 1 for Coordinated BF (Reuse 1: spectrum fully reused) ¡ High CINR users group (cell center region) • • ¦ FFR Group 2 for Coordinated BF (Reuse 1: spectrum fully reused) ¡ Low CINR users group (not-clustered users in the cell edge region) • • ¦ Cooperation with neighbor cells is not required MU-MIMO, SM or SDMA can be implemented in terms of only serving cell point of view Cooperation with neighbor cells is required Multiple single streams using the same spectrum from neighboring cells by the help of both coordinated BF and Macro diversity FFR Group 3 for Coordinated BF (Reuse N: spectrum flexibly reused) ¡ Low CINR users group (clustered users in the cell edge region) • • Cooperation with neighbor cells is required Common subcarrier permutation may be required -7 -

IEEE 802. 16 m-08/374 Advantages ¦ Reduced Feedback Overhead ¦ Low Pilot Density ¦

IEEE 802. 16 m-08/374 Advantages ¦ Reduced Feedback Overhead ¦ Low Pilot Density ¦ Cell-edge Performance ¦ Inter-cell Interference Mitigation ¦ Low Deployment Cost -8 -

IEEE 802. 16 m-08/374 Text Proposal 11. X Downlink Network Coordinated BF In order

IEEE 802. 16 m-08/374 Text Proposal 11. X Downlink Network Coordinated BF In order to improve spectral efficiency of downlink dedicated data and control channels, network coordinated BF can be used. Such parameters as CINR and preferred beam index should be measured at MS and reported to the BS. Then BSs will share these feedback information. Depending on the feedback parameters from MSs, Access Service Network (ASN) can recognize the locations of MSs. MU-MIMO, SM or SDMA should be applied to MSs located at cell center regions in terms of only serving cell point of view. For MSs located at cell-edge regions and spaced apart enough to neglect inter-beam interference, network will arrange beams using the same spectrum from neighboring BSs not to collide each other as well as to obtain macro diversity. In case where users are located in the cell-edge regions, the network should use Reuse N to mitigate inter-cell interference. -9 -