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Multi-Carrier Handover Operation Support in IEEE 802.16

This presentation discusses the design concept of multi-carrier handover operation with support for scanning, network re-entry, and synchronization in IEEE 802.16m. It also explores various handover schemes for intra-frequency and inter-frequency handovers.

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Multi-Carrier Handover Operation Support in IEEE 802.16

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  1. Handover Operation with Multi-Carrier Support IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: C802.16m-08/1020 Date Submitted: 2008-09-05 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: MAC: Multi-Carrier Operation; in response to the TGm Call for Contributions and Comments 802.16m-08/033 for Session 57 Base Contribution: This is the base contribution Purpose: To be discussed and adopted by TGm for the 802.16m SDD

  2. Multi-Carrier Mobility Management Design Concept • The MS may maintain its normal operations with the serving BS on one carrier (using one RF) while perform scanning or network re-entry to the target BS on another carrier (by another RF)

  3. Scanning in Multi-Carrier System • In cell reselection, the MS scans primary (fully-configured) carriers of neighbor BSs • The MS may also scan other primary carriers of its serving BS

  4. Scanning with Multi-Carrier Support (1/4) • Scanning using the RF other than the one for its primary carrier • The MS dedicates its secondary RF for either normal scanning or autonomous scanning • In normal scanning, the scanning request/response messages can be exchanged over either the primary carrier or the secondary carrier • Scanning operations go in parallel with normal operations on the primary carrier

  5. Scanning with Multi-Carrier Support (2/4) • An example of the MSC for scanning using secondary RF • RF #2 is dedicated to scanning • Scanning request/response can be exchanged via either carrier #1 or carrier #2

  6. Scanning with Multi-Carrier Support (3/4) • Scanning using multiple RFs simultaneously • Perform DL channel evaluation and synchronization to multiple frequency bands via multiple RFs simultaneously • To expedite the scanning operation (e.g. fast cell reselection)

  7. Scanning with Multi-Carrier Support (4/4) • An example of the MSC for scanning using multiple RFs simultaneously

  8. Intra-Frequency Handover (1/5) • Handover Scheme #1 • RF #1: primary carrier with S-BS until T-BS DL synchronization is done • RF #2: DL synchronization (and initial ranging if possible) with T-BS • Description • The MS may use another RF (e.g. RF #2) to acquire the DL/UL channel parameters of the target BS (e.g. timing/frequency offset ) before disconnecting its primary carrier (e.g. on RF #1) from the serving BS • After the DL/UL channel parameters are obtained, RF #2 may proceed to network reentry to the target BS, or it can pass the parameters to RF #1 to complete network reentry • Advantage • Reduced handover interruption time

  9. Intra-Frequency Handover (2/5) • Handover Scheme #1 - Scenario 1 • The MS synchronizes with the target carrier (the primary carrier to handover to) of the target BS before disconnecting from the serving BS • The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to synchronize to the DL channel on the primary carrier of the T-BS and acquire the DL/UL parameters • Remaining network reentry procedures (including initial ranging) are completed using RF #2 after the primary carrier to the S-BS has been disconnected

  10. Intra-Frequency Handover (3/5) • Handover Scheme #1 - Scenario 2 • The MS synchronizes with a fully-configured carrier of the target BS other than the target carrier before disconnecting from the serving BS • The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to perform initial ranging to a fully-configured carrier of the T-BS other than the target carrier • Remaining network reentry procedures are completed using RF #1 after disconnecting from the S-BS • The ranging parameters acquired by RF #2 (UL timing, power, etc.) are used by RF #1 to expedite its network reentry process

  11. Intra-Frequency Handover (4/5) • Handover Scheme #2 • RF #1: • Primary carrier with S-BS until new primary carrier with the T-BS is established • Scheduled sleeping intervals • RF #2: network reentry to the T-BS within sleeping intervals • Description • The MS puts its primary carrier (e.g. carrier #1) into sleep mode and uses another carrier (e.g. carrier #2) for network reentry to the target BS within the sleeping intervals of its primary carrier • The primary carrier to the serving BS maintains connected until the new primary carrier to the target BS is established • Advantage • Make-before-break HO

  12. Intra-Frequency Handover (5/5) • An example of the MSC for HO scheme #2 • Primary carrier goes sleep upon receiving Fast Ranging IE • RF #2 sends RNG_REQ within the sleep interval of the primary carrier

  13. Inter-Frequency Handover (1/3) • Handover Scheme #1 can also be used for inter-frequency handover • RF #1: primary carrier with S-BS until initial ranging to the T-BS is done • RF #2: initial ranging to the T-BS • Description • The MS synchronizes with the target carrier of the target BS before disconnecting from the serving BS • The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to perform initial ranging to the primary carrier of the T-BS • Remaining network reentry procedures (including initial ranging) are completed using RF #2 after the primary carrier to the S-BS has been disconnected • Advantage • Handover interruption time is reduced

  14. Inter-Frequency Handover (2/3) • Handover Scheme #3 • RF #1: primary carrier with S-BS until new primary carrier with T-BS is established • RF #2: network reentry to the T-BS • Description • Using the secondary RF (any RF other than the one for the primary carrier) for network reentry • The primary carrier to the serving BS maintains connected until the new primary carrier to the target BS is established • New primary carrier is established on the secondary RF • Advantage • Make-before-break HO

  15. Inter-Frequency Handover (3/3) An example of the MSC for HO scheme #3

  16. Summary of Multi-Carrier Handover Schemes • Handover Scheme #1 • Intra-frequency handover • Inter-frequency handover • Handover Scheme #2 • Intra-frequency handover • Inter-frequency handover • Make-before-break handover • Handover Scheme #3 • Inter-frequency handover • Make-before-break handover

  17. SDD Text Proposal • Add the following text into Session 10 of the SDD (IEEE 802.16m-08/003r4) • ----------------------- text begin ----------------------------------------------------------------------------- • 10.3.x Handover Operation with Multi-Carrier Support • 10.3.x.1 Handover Preparation • During handover preparation, the MS may use multiple RF carriers to maintain normal communication with the serving BS while performing scanning or association with neighbor BSs. • 10.3.x.2 Handover Execution • During handover execution, the MS may use multiple RF carriers to maintain normal communication with the serving BS while performing network re-entry signaling with the target BS. • ----------------------- text end -------------------------------------------------------------------------------

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