IEEE C802.16m-09/0638
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Proposed IEEE 802.16m Amendment Text on Handover with Multi-Carrier Support
Date
Submitted
2009-03-02
Source(s)
Kelvin Chou, Yih-Shen Chen, I-Kang Fu
and Paul Cheng
Kelvin.Chou@mediatek.com
MediaTek Inc.
Re:
New Topic for 802.16m AWD - Handover
Abstract
This contribution proposes IEEE 802.16m AWD text on the HO procedure.
Purpose
Propose to be discussed and adopted by TGm for the 802.16m AWD
Notice
Release
Patent
Policy
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Proposed IEEE 802.16m Amendment on Handover with Multi-Carrier Support
Kelvin Chou, Yih-Shen Cheng, I-Kang Fu and Paul Cheng
MediaTek Inc.
I. Introduction
This contribution proposes amendment text on the handover procedures for the WirelessMAN-OFDMA
Advance System with multi-carrier support.
The content of our proposed text (a ToC) is summarized as follows:
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IEEE C802.16m-09/0638
-----------------------------------------------------------------------------------------------------------------15.2.x MAC handover procedures
15.2.x.4 Handover process with multi-carrier support
15.2.x.4.1 AMS scanning of target carriers
15.2.x.4.2 HO preparation and execution
------------------------------------------------------------------------------------------------------------------
II. Proposed Text
----------------------------------------------------------- Text Start ---------------------------------------------------------------
15.2.x MAC handover procedures
15.2.x.4 Handover process with multi-carrier support
The multi-carrier handover (MCHO) is defined as the handover process which involves multiple radio carriers.
The sub-clause defines the process of HO with multi-carrier support.
15.2.x.4.1 AMS scanning of target carriers
The AAI_NBR-ADV message shall carriers neighbor ABS’s multi-carrier configuration information to facilitate
AMS’s scanning of neighbor ABS’s fully configured carriers. The scanning follows the procedures defined in
section 15.2.x.1.2 except that AMS scans each fully configured carrier of the neighbor ABSs as advertised in the
AAI_NBR-ADV. The AMS may also scan inactive carriers of the serving ABS. Figure xx4 illustrates the
example message flows for neighbor ABS advertisements and scanning of fully configured carriers of serving
and neighbor ABSs.
[Note: This figure is modified from Rev2/D8, Annex D, Figure D.1]
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IEEE C802.16m-09/0638
ABS#1 (serving)
Full conf.
Carrier#1
AMS
Full conf.
Carrier#2
ABS#2
Full conf.
Carrier#1
Full conf.
Carrier#2
ABS#3
Full conf.
Carrier#1
Full conf.
Carrier#2
AAI_NBR-ADV
(N_Neighbors=2)
(Multi-carrier information)
By AMS
request only
AAI_SCN-REQ
(Scan duration = N frames,
Interleaving interval = P frames,
Iteration=T times)
AAI_SCN-RSP
(start frame = M frames)
(duration = N frames)
M frames
Synchronize with carrier #1 of ABS #2
Synchronize with carrier #2 of ABS #2
Iteration #1
Scanning interval
duration = N frames
Synchronize with carrier #2 of ABS #1
Nonscanning interleaving
interval (P frames)
Synchronize with carrier #1 of ABS #3
Synchronize with carrier #2 of ABS #3
Data traffic (if any)
Additional alternations
of scanning interval and
interleaving intervals
Figure xx4 — Example message flows for neighbor ABS advertisements and scanning of fully
configured carriers of serving and neighbor ABSs.
An AMS capable of concurrently processing multiple radio carriers may perform scanning with neighbor ABSs
using one or more of its available radio carriers while maintaining normal operation with the serving ABS on
the primary carrier and secondary carriers. In this case, the AMS may inform the serving ABS through
AAI_SCN-REQ its carriers to be assigned for scanning operations to avoid resource allocation on those carriers,
as illustrated in Figure xx5.
[Note: This figure is modified from Rev2/D8, Annex D, Figure D.1]
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IEEE C802.16m-09/0638
AMS
Primary
carrier
ABS#1 (serving)
Full conf.
Carrier#1
Carrier#2
Full conf.
Carrier#2
ABS#2
Full conf.
Carrier#1
Full conf.
Carrier#2
ABS#3
Full conf.
Carrier#1
Full conf.
Carrier#2
AAI_NBR-ADV
(N_Neighbors=2)
(Multi-carrier information)
AAI_SCN-REQ
(Scan duration = N frames)
(ID of carriers for scanning)
AAI_SCN-RSP
(start frame = M frames)
(duration = N frames)
Synchronize with
carrier #2 of ABS #1
AMS continues normal
operation with serving
ABS on primary carrier
Scanning interval
duration = N frames
M frames
Synchronize with carrier #1 of ABS #2
Synchronize with carrier #2 of ABS #2
Synchronize with carrier #1 of ABS #3
Synchronize with carrier #2 of ABS #3
Figure xx5 — Example message flows for scanning of fully configured carriers of serving and
neighbor ABSs using available radio carriers of the AMS
15.2.x.4.2 Multi-carrier handover (MCHO) process
[Note: The following paragraphs are modified from SDD]
The multi-carrier handover (MCHO) is defined as the handover process which involves multiple radio carriers
during handover initiation, preparation or execution.
The AMS may get the information on OFDMA multi-carrier capabilities of one or more possible target ABSs
from the AAI_BSHO-CMD message sent by the serving ABS.
An AMS in multi-carrier operation follows the handover operation defined in 15.2.x.2. MAC management
messages in relation with handover preparation and initiation between the AMS and the serving ABS are
transmitted over the primary carrier of the AMS.
If the HO_Reentry_Mode in AAI_BSHO-CMD message is set to 1, the AMS performs network reentry with the
target ABS on the assigned fully configured carrier at action time while continuously communicating with
serving ABS until completion of network reentry at the target ABS. Multiplexing of network reentry signaling
with target ABS and communications with serving ABS is done via multiple radio carriers, i.e. the AMS
performs network reentry on one of its available radio carriers while maintaining data communication with the
serving ABS on the serving primary and secondary carriers. In this case, the AMS may inform the serving ABS
through AAI_HO-IND the carrier to be assigned for network reentry operations to avoid resource allocation on
those carriers. Figure xx6 shows an example call flow of MCHO in which the AMS maintain data
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IEEE C802.16m-09/0638
communication with the serving ABS on one radio carrier while performing network reentry to the target ABS
on another radio carrier.
Serving
ABS
AMS
Target
ABS
HO REQ
ABS
initiated HO
HO RSP
AAI_BSHO-CMD
or
AAI_MSHO-REQ
AMS
initiated HO
HO REQ
HO RSP
AAI_BSHO-CMD
AAI_HO-IND
Network re-entry to T-ABS
Data communication
with S-ABS during
network re-entry
HO COMPLT
Data path established
Data path established
Radio
carrier
1
Radio
carrier
2
Serving
primary
carrier
Backbone
Target Backbone Target
primary
secondary
carrier
carrier
Figure xx6 — A call flow for multi-carrier HO in which the AMS performs network reentry to the target
ABS on one radio carrier while maintaining communication with the serving ABS on another.
In case AMS is capable to process multiple carriers at the same time, the target primary carrier can be different
than the one chosen in serving cell. Figure xx7 shows an example MCHO call flow of the case in which AMS is
capable to process multiple carriers at the same time and the target primary carrier is different from the serving
primary carrier.
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IEEE C802.16m-09/0638
Serving
ABS
AMS
Target
ABS
HO REQ
ABS
initiated HO
HO RSP
AAI_BSHO-CMD
or
AAI_MSHO-REQ
AMS
initiated HO
HO REQ
HO RSP
AAI_BSHO-CMD
AAI_HO-IND
Network re-entry to T-ABS
Data communication with S-ABS during
network re-entry
HO COMPLT
Data path established
Data path established
Radio
carrier
1
Radio
carrier
2
Serving
primary
carrier
Backbone
Target Backbone Target
primary
secondary
carrier
carrier
Figure xx7 — A call flow for multi-carrier HO in which the AMS performs network reentry on the target
primary carrier which is different from the serving primary carrier
------------------------------------------------------------ Text End ---------------------------------------------------------------
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