2008-03-10
IEEE C802.16x-08/144r1
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Mobility Management with Multi-Carrier Support in IEEE 802.16m
Date
Submitted
2008-03-10
Source(s)
Kelvin Chou, I-Kang Fu, Yih-Shen Chen and
Paul Cheng
MediaTek Inc.
No.1, Dusing Rd. 1, HsinChu Science-Based
Industrial Park, HsinChu, Taiwan 300, R.O.C.
Re:
Kelvin.Chou@mediatek.com
Yihshen.Chen@mediatek.com
IK.Fu@mediatek.com
Paul.Cheng@mediatek.com
IEEE 802.16m-08/005, “Call for Contributions on Project 802.16m System Description
Document (SDD)”. In response to the following topics:
• Comments on the content of Section 8 of IEEE 802.16m-08/003
Abstract
This contribution depicts how the mobility management, mainly handover process, can benefit
from the support of multiple RF carriers. Similar idea can also be applied to other function
blocks including radio resource management and MBS. Text proposal and figure updates to
describe multi-carrier support block and its interactions with other function blocks are also
proposed to be included in Section 8 of 802.16m SDD.
Purpose
To be discussed and adopted by TGm for the 802.16m SDD.
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only 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.
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.
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
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2008-03-10
IEEE C802.16x-08/144r1
Mobility Management with Multi-Carrier Support in IEEE 802.16m
Kelvin Chou, I-Kang Fu, Yih-Shen Chen and Paul Cheng
MediaTek Inc.
Introduction
The multi-carrier function block has been mentioned in current 802.16m protocol structure but not been
addressed yet. This contribution depicts how the mobility management, mainly handover process, can benefit
from the support of multiple RF carriers. Similar idea can also be applied to other function blocks including
radio resource management and MBS. A text proposal for the description of multi-carrier function block is also
proposed to be included in the 802.16m SDD, and changes to the figures of MS/BS control/data plane
processing flow are proposed to highlight the exchange of control primitives between multi-carrier support
block and other benefited function blocks.
Multi-Carrier Supported Handover
The concept of multi-carrier supported handover is illustrated in Figure 1. A MS with 2 or more RF carriers
maintains its user data transmission with serving BS on one RF carrier while perform scanning or network
reentry procedures with target BS on another RF carrier. With the aid of extra RF carriers, data transmission can
proceed without interruption during the handover process.
Target BS / RS
Cell Boundary
Serving BS / RS
MAC
PHY
RF2
RF3
PHY
RF1
RF2
RF3
D
R
Sc a n
N an gin
W n g,
en ing
try ,
RF1
MAC
a
at
RF1
RF2
PHY
MAC
MS / Mobile RS
Figure 1. Multi-Carrier supported handover
A comparison between 802.16e hard handover and proposed multi-carrier supported handover is illustrated in
Figure 2. As seen in Figure 2a, during the legacy handover period, data transmission is broken into pieces due to
MAC management message transmission, interleaved scanning intervals and network entry procedures. With
the support of multiple RF carriers, as seen in Figure 2b, data and MAC management messages (including
scanning and ranging) can be transmitted on separated RF carrier in parallel. Therefore, user data traffic can be
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2008-03-10
IEEE C802.16x-08/144r1
seamlessly migrated from serving BS to target BS without interruption.
MS
SBS
NBS 1
MS
NBS 2
NBS 1
NBS 2
RF1 RF2
RF1 RF2
Topology acquisition
(MOB_NBR-ADV)
Topology acquisition
(MOB_NBR-ADV)
Normal
Data traffic
traffic
Data traffic via RF1 of SBS
Interleaved
scanning periods
Data traffic
Scanning
Data traffic
Scanning
Data traffic
Handover decision
(MOB_MSHO-REQ,
MOB_BSHO-REQ/RSP)
MOB_HO-IND
handover
interruption
SBS
RF1 RF2
RF1 RF2
Data traffic via RF1 & RF2 of SBS
Scanning
Scanning
Handover decision
(MOB_MSHO-REQ,
MOB_BSHO-REQ/RSP)
MOB_HO-IND
network entry
procedure
Data traffic via RF1 of NBS 1
network entry procedure
Data traffic via RF1 & RF2 of NBS 1
Data traffic
(b)
(a)
Figure 2. (a) 802.16e handover and (b) multi-carrier supported handover
RRM with Multi-Carrier Support
Flexible resource planning and load balance can be realized by dynamically distribute users across multiple RF
carriers, as illustrated in Figure 3. For users demanding high peak data rates, aggregation of RF carriers can be
used to serve as a wideband channels. BS can also dynamically distribute its users across multiple RF carriers
according to its traffic load.
SBS
MAC
PHY
RF1
RF
RF1
RF1
RF1PHY
PHY
PHY
PHY
MAC
MAC
MAC
MAC
MS1, 10MHz
MS1, 10MHz
MS1, 10MHz
MS1, 10MHz
RF2
RF
RF1
PHY
PHY
RF3
RF1
RF2
RF1
RF2
PHY
PHY
MAC
MAC
RF
RF1
PHY
PHY
MAC
MAC
MS5, 10MHz
MS2, 10MHz
MS7, 20MHz
MS3, 20MHz
MAC
MAC
MS9, 10MHz
MS2, 10MHz
Figure 3. Load balancing across multiple RF carriers
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2008-03-10
IEEE C802.16x-08/144r1
MBS with Multi-Carrier Support
Scenario 1: coexistence/seamless switching between MBS and unicast services. MBS can be deployed on
dedicated RF carriers while unicast services are performed on separated RF carriers.
MBS Zone
BS1
BS2
MAC
MAC
PHY
PHY
RF3
RF1
MAC
RF2
RF1
PHY
MAC
MS2, 20MHz
RF2
PHY
MAC
MS1, 10MHz
t
PHY
as
RF1
ic
PHY
RF2
un
Multicast / Broadcast
st
RF1
RF3
st
unica
RF1
RF2
i ca
RF2
un
RF1
MAC
MS3, 20MHz
MS4, 20MHz
Figure 4. MBS over MB-OFDM PHY
Scenario 2: Non-interrupted MBS zone switching. MBS zone switching operations such as update of MCID
and LCID can be performed on separated RF carrier to provide non-interrupted multicast/broadcast service
during zone switching.
Serving MBS Zone
Target MBS Zone
BS
BS
BS
BS
BS
BS
MAC
MAC
MAC
MAC
MAC
MAC
PHY
PHY
PHY
RF1
RF2
RF3
RF1
RF2
RF3
RF1
RF2
RF3
PHY
PHY
PHY
RF1
RF2
RF3
RF1
RF2
RF3
RF1
RF2
RF3
MBS zone switching
RF1
PHY
MAC
MS1, 10MHz
RF1
RF2
PHY
RF1
RF2
PHY
MAC
MS2, 20MHz
MAC
MS3, 20MHz
Figure 5. Non-interrupted MBS zone switching
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2008-03-10
IEEE C802.16x-08/144r1
Modifications to Control/Data Plane Processing Flow
Updates to the current 802.16m control/data plane processing flow is proposed to highlight the exchanges of
control primitives between multi-carrier support block and other benefited function blocks, as seen in Figure 6
and Figure 7 (marked by red dotted rectangle). Control primitives between multi-carrier support block and other
benefited function blocks are to be further studied.
C_SAP
M_SAP
Network Layer
Routing
Idle Mode
Management
Location
management
System
configuration
management
Multi-Carrier
Support
Mobility
Management
Radio Resource
Management
MBS
Self-Organization
Network-entry
Management
Security
management
Connection
Management
Convergence Sublayer
MAC Common Part Sublayer
Sleep Mode
Management
QoS
Scheduling and
Resource
Multiplexing
Multi-Radio
Coexistence
PHY control
Data Forwarding
Interference
management
Ranging
ARQ
Fragmentation/Packing
MAC PDU formation
Control
Signaling
Link Adaptation
(CQI, HARQ,
power control)
Encryption
PHY control signaling
Physical Layer
Figure 6. Modified 802.16m MS/BS Data Plane Processing Flow
C_SAP
M_SAP
Network Layer
Routing
Idle Mode
Management
Location
Management
System
configuration
management
Multi-Carrier
Support
Mobility
Management
Radio Resource
Management
MBS
Self-Organization
Network entry
management
Security
management
Connection
Management
Sleep Mode
Management
QoS
Convergence Sublayer
MAC Common Part Sublayer
ARQ
Multi-Radio
Coexitence
Scheduler
Fragmentation/Packing
PHY Control
Data Forwarding
Interference
management
Ranging
MAC PDU formation
Link Adaptation
(CQI, HARQ,
power control)
Control Signaling
Encryption
PHY control signaling
Physical Layer
Figure 7. Modified 802.16m MS/BS Control Plane Processing Flow
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2008-03-10
IEEE C802.16x-08/144r1
Proposed Text for SDD
[In 80216m-08_003, Section 8.2, add the following text at line 14]
------------------------------- Text Start
------------------------------------------------------------------------------------
Multi-carrier block enables multiple RF carriers to be deployed in contiguous or noncontiguous spectrum, and
provides MS/BS abilities to distribute and handle control/data plane messages among multiple RF carriers.
Multi-carrier block also interacts with and advances the performance of the following function blocks:

Mobility Management: Fast handover using multiple RF carriers. MS can proceeds its normal operation
with serving BS on one RF carrier while perform HO procedures such as scanning and network reentry
with target BS on another RF carrier.

Radio Resource Management: Flexible resource planning and dynamic load balance across multiple RF
carriers. Aggregation of multiple RF carriers can be used to create wideband channels for users demanding
high peak data rates. BS can also dynamically distribute its users across multiple RF carriers according to
the traffic load.

MBS: Coexistence/seamless switching between unicast and multicast/broadcast services and noninterrupted MBS zone switching. MBS can be deployed on dedicated RF carriers while unicast services are
performed on separated RF carriers. Furthermore, MBS zone switching operations such as update of MCID
and LCID can be performed on separated RF carrier to provide non-interrupted multicast/broadcast service
during zone switching.
[In 80216m-08_003, Section 8.2.1, replace Figure 8 with Figure 8x below]
C_SAP
M_SAP
Network Layer
Routing
Idle Mode
Management
Location
management
System
configuration
management
Multi-Carrier
Support
Mobility
Management
Radio Resource
Management
MBS
Self-Organization
Network-entry
Management
Security
management
Connection
Management
Convergence Sublayer
MAC Common Part Sublayer
Sleep Mode
Management
QoS
Scheduling and
Resource
Multiplexing
Multi-Radio
Coexistence
PHY control
Data Forwarding
Interference
management
Ranging
ARQ
Fragmentation/Packing
MAC PDU formation
Link Adaptation
(CQI, HARQ,
power control)
Control
Signaling
Encryption
PHY control signaling
Physical Layer
Figure 8x. The IEEE 802.16m MS/BS Data Plane Processing Flow
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2008-03-10
IEEE C802.16x-08/144r1
[In 80216m-08_003, Section 8.2.2, replace Figure 9 with Figure 9x below]
C_SAP
M_SAP
Network Layer
Routing
Idle Mode
Management
Location
Management
System
configuration
management
Multi-Carrier
Support
Mobility
Management
Radio Resource
Management
MBS
Self-Organization
Network entry
management
Security
management
Connection
Management
Sleep Mode
Management
QoS
Convergence Sublayer
MAC Common Part Sublayer
ARQ
Multi-Radio
Coexitence
Scheduler
Fragmentation/Packing
PHY Control
Data Forwarding
Interference
management
Ranging
MAC PDU formation
Link Adaptation
(CQI, HARQ,
power control)
Control Signaling
Encryption
PHY control signaling
Physical Layer
Figure 9x. The IEEE 802.16m MS/BS Control Plane Processing Flow
------------------------------- Text End
-------------------------------------------------------------------------------------
References
[1] IEEE 802.16m-08/003, “The Draft IEEE 802.16m System Description Document”, January 2008.
[2] IEEE C802.16m-08/092r1, “Proposal for Generalized Multi-carrier Support in IEEE 802.16m Systems”,
January 2008.
7