IEEE C802.16m-09/1027
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Functional Details of Sleep Mode for Multi-carrier Operation in IEEE 802.16m
Date
Submitted
2009-04-27
Source(s)
Eunkyung Kim, Jaesun Cha, Juhee Kim,
Soojung Jung, Kwangjae Lim, Hyun Lee,
Chulsik Yoon
ETRI
138 Gajeongno, Yusong-gu, Daejeon,
305-700, KOREA
Re:
Category: AWD-New contribution/Area: Multi-carrier, “Contribution on AWD Multi-carrier,”
in response to the TGm Call for Contributions on Project 802.16m Amendment Working
Document (AWD) Content, IEEE 802.16m-09/0020 for session #61
Abstract
Sleep mode operation in the MAC aspect of multi-carrier operation
Purpose
To discuss and adopt the proposed text in the next revision of 802.16m amendment
Notice
Release
Patent
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E-mail: ekkim@etri.re.kr
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Functional Details of Sleep Mode for Multi-carrier Operation in IEEE
802.16m
Eunkyung Kim, Jaesun Cha, Juhee Kim, Soojung Jung, Kwangjae Lim, Hyun Lee, Chulsik Yoon
ETRI
1 Instructions
The draft of IEEE 802.16m System Description Document (SDD)[1] describes the support for multi-carrier
operation including the sleep mode in the MAC aspect. In this contribution, we describe the functional details of
sleep mode operation in the MAC aspect of multi-carrier operation in IEEE 802.16m.
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IEEE C802.16m-09/1027
2. Functional details of sleep mode for multi-carrier operation
General concept of sleep mode for multi-carrier operation is the same as the single carrier mode operation.
However, the functional details of sleep mode operation for multi-carrier operation are as follows;
- The all MAC messaging are handled by the primary carrier.
- Sleep mode parameters (i.e., sleep window and listening window configuration) are configured for one
AMS
- Sleep Cycle operation is as follow.
1) Final Sleep Cycle is larger than 2 times the Initial Sleep Cycle where the length of Sleep Cycle
exponentially enlarges until the Final Sleep Cycle
2) Final Sleep Cycle is equal to the Initial Sleep Cycle which is fixed sleep cycle
 The case of sleep cycle operation 1 is suitable for BE-traffic scenario. In this case, traffic indication
may be enabled AMS and it is transmitted via the primary carrier. During listening window, traffic
indication enabled AMS monitors the traffic indication on the primary carrier. If the traffic
indication is negative, the AMS goes back to sleep which is the same as the single carrier operation.
However, if the traffic indication is positive, the AMS continues to monitor the primary carrier
control channel to know if it has traffic scheduled for transmission on the primary carrier and/or
secondary carrier.
 The case of sleep cycle operation 2 is suitable for real-time traffic in the “real-time traffic-only” or
“real-time and BE-traffic mixed” scenario. In this case, traffic indication may be disabled to AMS
and the AMS and the serving ABS can negotiate the one or more carriers (i.e., primary and/or
secondary carriers). Those information is not changed unless the AMS exits the sleep mode or the
sleep mode parameter update is performed. The AMS can receive DL data via those negotiated
carriers during listening window without any monitoring the primary carrier control channel or any
notification. Therefore, the AMS does not need to monitor the control channel on the primary
carrier to know if it has traffic scheduled for transmission on the secondary carriers. The ABS can
allocate the DL resource on the secondary carriers as soon as Listening Window starts. Those
carriers can be changed during the listening window.
- For the power saving, load balancing, or alleviating signaling overhead, primary carrier change or carrier
switching can be performed on entering the sleep mode or during the listening window [2].
- Serving ABS may terminate the sleep mode in order to request the AMS for the purpose of primary
carrier switching with ranging on other carrier which are not serving the AMS if required.
- For a multi-carrier AMS which is operating in carrier switching mode, the E-MBS connection through
the dedicated carrier which is partially configured may be considered in negotiation procedure of sleep
mode [3].
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IEEE C802.16m-09/1027
3. Example of sleep mode for multi-carrier operation
In this section, we describe the example of the sleep mode of the sleep cycle operation 2 for multi-carrier
operation.
3.1. “Real-time only” scenario
Fig. 1 shows the example of procedure for sleep mode in “real-time only” scenario. In the figure, sleep mode
parameters are configured including one or more carriers available to receive the real-time traffic simultaneously
via primary carrier (index#0). The configured carriers can receive the real-time traffic without any monitoring
the primary carrier control channel. The sleep mode related information such as sleep cycle and configured
carriers are not changed unless the AMS exits the sleep mode or the parameter update is performed. ABS may
request to AMS to change the carrier among secondary carriers by notification if required. After notification, the
carriers to receive the real-time traffic are from index#0 and #1 to index#0 and #2. Detail of the carrier change
operation is FFS. Like the “BE-traffic only,” primary carrier change may be performed during the listening
window but the configured carriers and the other information is not changed until the termination of sleep mode
or sleep mode parameter update. Detail of the primary change operation is FFS.
3.2. “Real-time and BE-traffic mixed” scenario
Fig. 2 shows the example of procedure for sleep mode in “real-time and BE-traffic mixed” scenario. As shown
the figure, general operation for real-time is the same as “real-time only” scenario. For the BE-traffic, the AMS
continues to monitor the primary carrier control channel to know if it has traffic scheduled for transmission on
the primary carrier and/or secondary carrier.
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IEEE C802.16m-09/1027
AMS
0
1
2
ABS
3
Data & Messaging transfer
DL only
DL only
Negotiated the sleep mode parameter
(carriers to receive the PDUs)
Sleep cycle
Real time PDUs
for the AMS
Sleep cycle
Real time PDUs
for the AMS
Request Carrier
change to receive
the PDUs
Carrier change to
receive the PDUs
Sleep cycle
Real time PDUs
for the AMS
Sleep cycle
Real time PDUs
for the AMS
Real time PDUs
for the AMS
Sleep mode termination
Real time
PDU
Change
Req. Info.
Fig. 1. Sleep mode operation for “real-time” scenario with negotiation carriers via the AMS recevies
the DL traffic without any monitoring primary carrier or any notification. The netotiated carrier is not
changed unless the carrer change notification.
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IEEE C802.16m-09/1027
AMS
0
1
2
ABS
3
Data & Messaging transfer
DL only
DL only
Negotiated the sleep mode parameter
(carriers to receive the PDUs)
Notify for BE
Real time & BE
PDUs for the
AMS
Sleep cycle
Monitoring
primary carrier for
BE
Sleep cycle
Real time PDUs
for the AMS
Request Carrier
change to receive the
real-time PDUs
Carrier change to
receive the realtime PDUs
Sleep cycle
Real time PDUs
for the AMS
Sleep cycle
Monitoring
primary carrier for
BE
Real time PDUs
for the AMS
Notify for BE
Real time & BE
PDUs for the
AMS
Sleep mode termination
Real time
PDU
Change
Req. Info.
Notification
for BE
Fig. 2. Sleep mode operation in the “Real-time and BE-traffic mixed” scenario with negotiation
carriers via the AMS recevies the DL traffic without any monitoring primary carrier or any notification.
The netotiated carrier is not changed unless the carrer change notification.
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IEEE C802.16m-09/1027
4. Text Proposal for the 802.16m AWD
[-------------------------------------------------Start of Text Proposal---------------------------------------------------]
[Adopt the following text in the 802.16m Amendment Working Document (AWD)]
15. Advanced Air Interface
15.2 Medium Access Control
15.2.x.x MAC aspect of OFDMA Multi-carrier operation
15.2.x.x.x Power Management
15.2.x.x.x.1 Sleep mode
When an AMS enters sleep mode, the negotiated policy of sleep mode is applied to a common MAC regardless
of OFDMA multi-carrier mode and all carries powers down according to the negotiated sleep mode policy. Data
transmission follows the normal operation (no sleep) defined for multiple carriers. One set of unified sleep
mode parameters (i.e., sleep window and listening window configuration) are configured for an AMS regardless
of single carrier or multi-carrier operation.
For the traffic indication enabled AMS, during the listening window of sleep mode, the traffic indication is
transmitted through the primary carrier. During listening window, AMS monitors the traffic indication on the
primary carrier. If traffic indication is negative, AMS goes back to sleep. If traffic indication is positive, AMS
continues to monitor the primary carrier control channel to know if it has traffic scheduled for transmission on
the primary carrier and/or secondary carrier.
If the length of a Sleep Cycle is fixed based on the traffic pattern of real-time connections established between
AMS and ABS, the AMS doesn’t need to monitor the control channel on the primary carrier to know if it has
traffic scheduled for transmission on the secondary carriers. The AMS can allocate the DL resource on the
negotiated carriers as soon as Listening Window starts. Those carriers can be changed during the listening
interval.
Note that the serving ABS may request AMS to change or switch its primary carrier on entering the sleep mode
or during the listening window for load balancing, power saving, or alleviating signaling overhead.
Serving ABS may terminate the sleep mode in order to request the AMS for the purpose of primary carrier
switching with ranging on other carrier which are not serving the AMS if required.
For a multi-carrier AMS which is operating in carrier switching mode, the E-MBS connection through the
dedicated carrier which is partially configured may be considered in negotiation procedure of sleep mode.
[-------------------------------------------------End of Text Proposal----------------------------------------------------]
References
[1] Shkumbin Hamiti, “IEEE 802.16m System Description Document,” IEEE 802.16m-08/003r8, April, 2009
[2] Eunkyung Kim, Juhee Kim, Soojung Jung, Jaesun Cha, Kwangjae Lim, Hyun Lee, Chulsik Yoon, “Need of
Primary Carrier Change/Switch for Multi- carrier Operation in IEEE 802.16m,” IEEE 802.16m-09/1021,
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IEEE C802.16m-09/1027
May, 2009
[3] Soojung Jung, Juhee Kim, Eunkyung Kim, Jaesun Cha, Kwangjae Lim, Hyun Lee, Chulsik Yoon,
“Proposed IEEE 802.16m Amendment on E-MBS support with multi-carrier,” IEEE 802.16m-09/1025,
May, 2009
7