Mobility Management for IEEE m

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Presentation transcript:

Mobility Management for IEEE 802.16m Document Number: C802.16m-08/563 Date Submitted: 2008-07-07 Source: Kelvin Chou Kelvin.Chou@mediatek.com Yih-Shen Chen Yihshen.Chen@mediatek.com I-Kang Fu IK.Fu@mediatek.com Paul Cheng Paul.Cheng@mediatek.com MediaTek Inc. No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park, Hsinchu, Taiwan 300, R.O.C. Venue: IEEE 802.16m-08/024 “Call for Comments and Contributions on Project 802.16m System Description Document (SDD)” In response to the topic: Upper MAC concepts and methods (mobility management) Base Contribution: N/A Purpose: To be discussed and adopted by TGm for the 802.16m SDD

16e Mobility Management Overview Scanning Normal scanning Scanning neighbor BSs within scheduled scanning intervals Autonomous scanning MS initiated scanning No serving BS scheduled scanning period is required No need to send scanning report to the serving BS The MS may scan different frequency bands Handover Normal handover with/without optimization Seamless handover Pre-update CID and TEK during HO preparation Proceeds to data transmission immediately without association or initial ranging Target BS is fully synchronized (in time and in frequency) with the serving BS MS is assumed to be synchronized with the UL/DL channel of the target BS MDHO/FBSS

16m Scanning Scenarios (1/2) Different cell type should be considered in scanning process Neighbor cell advertisement should take into account different cell types to reduce broadcast overhead

16m Scanning Scenarios (2/2) During cell reselection, the MS scans primary (fully-configured) carriers of neighbor BSs The MS may also scan other primary carriers of its serving BS

16m Handover Scenarios Possible handover scenarios Inter-BS-Intra-frequency HO Inter-BS-Inter-frequency HO Intra-BS-Inter-frequency HO (or carrier switch? carrier change?)

16m User Scenarios Different HO procedures for different user scenarios 16e HO Procedures 16m User Scenario Normal HO (with/without optimization) Low mobility users Seamless HO Cell edge users Seamless HO with initial ranging or association Pre-update CID and TEK during HO preparation just like seamless HO Proceeds to data transmission right after DL synchronization and CDMA initial ranging The DL synchronization and CDMA initial ranging may be done beforehand (e.g. during scanning with association) High mobility users

Reduction of Handover Interruption Time Schedule sleeping intervals with the Serving BS Network reentry to the Target BS within sleeping intervals Advantage Make-before-break HO

Other Handover Design Considerations More complete handover exception handling Loss of HO messages is not well handled in 16e In case of HO exception occurs, the MS may “handover back” to its serving BS, i.e. serving BS becomes the target BS More parameters and criteria for handover decision making PHY signaling report Loading (system loading, carrier loading) MS Mobility pattern (e.g. speed, direction) MS location Cross-layer design to minimize the handover interruption time Link-layer HO should notify upper layers to establish the new data path as early as possible Handover optimization between different cell types 16e cell, 16m cell, macro cell, micro cell, femto cell Handover with multi-carrier support Multi-carrier HO provides better efficiency and QoS guarantee as compared with single-carrier HO See C80216m-08/564 for multi-carrier HO design

SDD Text Proposal Add the following text into Session 10 of the SDD (IEEE 802.16m-08/003) ----------------------- text begin ----------------------------------------------------------------------------- 10.x Data/Control plane 10.x.y MAC Handover Procedures 10.x.y.1 Network topology acquisition The BS should take into account types of the neighbor cells to be advertised in order to reduce the overhead from the broadcast of neighbor cell advertisement messages. During cell reselection, the MS may prioritize the BSs to be scanned according to their cell types. The MS scans primary (fully-configured) carriers of neighbor BSs. The MS may also scan other primary carriers of its serving BS. 10.x.y.2 Handover Process User scenarios (e.g. mobility, location) should be taken into account in the selection of proper handover procedures. In order to reduce the handover interruption time, the MS may request a scheduled sleeping interval for the purpose of network reentry. Multiple RF carriers may also be used for handover operations to reduce the handover interruption time. 10.x.y.3 Handover with Multi-Carrier Support ----------------------- text end -------------------------------------------------------------------------------