IEEE C802.16m-09/0611r1
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed AWD text for HO support for legacy system
Date
Submitted
2009-3-2
Source(s)
Yang Liu,
Liu.yang8@zte.com.cn
mchion@zteusa.com
Mary Chion,
Hongyun Qu,
ZTE Corporation
Re:
Call for Contributions on Project 802.16m Amendment Working Document (AWD) Content
Abstract
This contribution proposes detail description on 16e to 16m HO operation
Purpose
To be discussed and adopted.
Notice
Release
Patent
Policy
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Proposed AWD text for HO support for legacy system
Yang Liu, Mary Chion, Hongyun Qu
ZTE Corporation
Introduction
This contribution proposes text for the sections describing HO operation for legacy system support.
Reference
[1] IEEE 802.16m Amendment Working Document, IEEE 802.16m-08/050
Proposed Amendment Text
The following text is proposed for inclusion in Section 15 of the IEEE 802.16m Amendment Working
Document.
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IEEE C802.16m-09/0611r1
15.2.x Handover
15.2.x.1 Network topology acquisition
15.2.x.2 Handover Procedure
15.2.x.3 Handover supporting WirelessMAN-OFDMA Reference System
The WirelessMAN-OFDMA Reference System/WirelessMAN-OFDMA Advanced System co-existing system
consists of WirelessMAN-OFDMA Reference System and WirelessMAN-OFDMA Advanced System
cells/sectors. An YBS advertises the system information for its neighbor YBSs and the LZones of its neighbor
ABSs. An ABS advertises the system information for its neighbor YBSs in its both LZone and Mzone. It
advertises the Lzones of its neighbor ABSs in its Lzone. It also advertises the system information for its
neighbor ABSs in Mzone.
The ABS may indicate its WirelessMAN-OFDMA Advanced capability and information in its LZone broadcast
information (e.g. by the modified reserved bit of the FCH and the MAC version TLV).
15.2.x.3.1 Handover from a YBS to an ABS
When a handover from a WirelessMAN-OFDMA Reference System to a WirelessMAN-OFDMA Advanced
System is triggered for a YMS, the YMS handover is from the serving YBS to the LZone of the target ABS
using WirelessMAN-OFDMA Reference System handover signaling and procedures as defined in 6.3.21.2.
An AMS may handover from a YBS to an ABS with a zone switch method or a direct handover procedure. The
details of zone switch and direct handover are described in 15.2.x.x.1 and 15.2.x.x.2, respectively.
15.2.x.3.1.1 Zone switch
An AMS may handover from the serving YBS to the LZone of the target ABS using a WirelessMAN-OFDMA
Reference System handover signaling and procedures, and switch to the MZone of the ABS after AMS entering
LZone. The AMS may request or be directed by the ABS to switch from LZone to MZone during network entry
to LZone of the ABS. The AMS may also request or be directed by the ABS to switch between LZone and
MZone after network entry to the ABS.
When zone switch is performed during network entry to the LZone of an ABS, the AMS sends a RNG-REQ
message and receives the zone switch indication from the ABS in RNG-RSP message. The RNG-RSP message
may include MZone information and allocation to AMS at MZone such as STIDs, FID when zone switching
indication is included. Based on the Mzone information obtained from the RNG-RSP message, the AMS then
performs necessary network re-entry procedure in the MZone. During zone switch process, the user data is
transmitted in the LZone while the AMS performs zone switch procedure in the MZone. After zone switch
completes, the AMS is only served in the MZone.
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IEEE C802.16m-09/0611r1
YBS
ABS
LZone
AMS
ABS
MZone
MOB_HO_IND
Initial Ranging code
RNG-RSP
Initial Ranging
Finished
RNG-REQ
RNG-RSP with Mzone information and allocation
Initial Ranging code
RNG-RSP
RNG-REQ
RNG-RSP
Figure HO-aa1 Zone Switch performed during network entry (from Lzone to Mzone)
When zone switch is performed from LZone to MZone after network entry to the ABS, the zone switch
initiation may be indicated by the ABS in LZone or by AMS through ranging request sent to the MZone. For
ABS initiated zone switch operation from LZone to MZone, the ABS sends MOB_BSHO-REQ with zone
switch indication to direct the AMS to switch to MZone. The MOB_BSHO-REQ shall include target MZone
information and may include AMS assignments at MZone such STID, FID, etc.
LZone
AMS
Zone Switch begins
MZone
MOB_BSHO-REQ(With a
zone switch indication)
HO_IND
data transmission continues in the
LZone until the connection in
Mzone is built
Initial Ranging code
RNG-RSP
RNG-REQ
RNG-RSP
Figure HO-aa2 Zone Switch initiated by ABS performed after network entry (from Lzone to Mzone)
When zone switch is performed from MZone to LZone after network entry to the ABS, the zone switch may be
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IEEE C802.16m-09/0611r1
initiated by the ABS using AAI-BSHO-CMD. During zone switch process, the user data is transmitted in the
MZone while the AMS performs necessary 16e network re-entry procedures in the LZone. After zone switch
completes, the AMS is only served in the LZone.
LZone
AMS
MZone
AAI-BSHO-CMD(With a zone switch indication)
Zone Switch begins
HO_IND
data transmission continues in the MZone until the
connection in LZone is built
Initial Ranging code
RNG-RSP
RNG-REQ
RNG-RSP
Figure HO-aa3 Zone Switch initiated by ABS performed after network entry (from Mzone to LZone)
15.2.x.3.1.2 Direct handover
An AMS may handover directly to the MZone of ABS or to the 16m only ABS.
The AMS may scan all the possible channels without any pre-knowledge of neighboring ABS. After
determining the target BS based on the information captured in the scan phase, the 16m MS will perform initial
ranging for HO in the ABS.
15.2.x.3.2 Handover from an ABS to an YBS
When an ABS to YBS handover is triggered for a YMS, the YMS handover is from LZone of the serving ABS
to the target YBS as described in 6.3.21.2.
When a an ABS to YBS handover is triggered for an AMS, the serving ABS and AMS perform handover
execution as described in 15.2.x. The serving ABS performs context mapping and protocol inter-working from
ABS to YBS system. Then the AMS perform network re-entry to target YBS as described in 6.3.21.2.
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