IEEE C802.16m-09/1519
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l
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Comments on Traffic Indication of Sleep Mode (AWD-15.2.16.2.3.1)
Date
Submitted
2009-07-06
Source(s)
Lei Zhang
zhang.lei13@zte.com.cn
Jianquan Song
Yang Liu
ZTE Corporation
Re:
802.16m Amendment Working Document
Abstract
Proposed Amendment Text on IEEE 802.16m Sleep Mode
Purpose
Discussion and adoption by TGm
Notice
Release
Patent
Policy
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>
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further
information
is
located
<http://standards.ieee.org/board/pat>.
at
<http://standards.ieee.org/board/pat/pat-material.html>
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Comments on Traffic Indication of Sleep Mode (AWD-15.2.16.2.3.1)
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Lei Zhang, Jianquan Song, Yang Liu
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ZTE Corporation
and
and
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Introduction
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In Sleep Mode, if the ABS schedules a large DL traffic at one time, the ABS and AMS may not finish
transmission only by extending Listening Window to occupy the whole Sleep Cycle in which the Listening
Window exists. In this case, the AMS may receive DL traffic in multiple continuous Sleep Cycles without
exiting Sleep Mode. However, as shown in Figure 1, based on currently defined Sleep Mode operation, the
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IEEE C802.16m-09/1519
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AMS still needs to receive multiple positive Traffic Indication messages and maybe signaling for Listening
Window extension during multiple continuous Sleep Cycles for the same DL traffic. This will bring
unnecessary air spending.
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First
Traffic Check Interval point
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
MS receives ‘Listening Window
Extension Indication’ either piggybacked with data or via separate
signaling
Frame Element
N
Third
Traffic Check Interval point
Second
Traffic Check Interval point
Frame Element
N+1
Frame Element
N+2
Minimum Listening Window
(e.g. length = 2 Frame Elements)
MS receives AAI_TRF-IND at
Listening Window Start
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
Listening Window Extension
Frame Element
N+M
Frame Element
N+M+2
Minimum Listening Window
(e.g. length = 2 Frame Elements)
MS receives AAI_TRF-IND at
Listening Window Start
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Frame Element
N+M+1
MS receives ‘Listening Window
Extension Indication’ either piggybacked with data or via separate
signaling
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Fourth
Traffic Check Interval point
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
Listening Window Extension
Frame Element
N+2M
Frame Element
N+2M+1
Frame Element
N+2M+2
Listening
Window
Extension
Minimum Listening Window
(e.g. length = 2 Frame Elements)
MS receives AAI_TRF-IND at
Listening Window Start
...
Frame Element
N+3M
Sleep Window
MS receives ‘Listening Window
Extension Indication’ either piggybacked with data or via separate
signaling
Figure 1
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Proposals
In order to efficiently indicate the large DL traffic at one time, as specified in Figure 2, we propose that when
the ABS needs multiple sleep cycles to transmit DL traffic to a specific AMS, the ABS may send
signaling/message to indicate the DL traffic for following multiple continuous Sleep Cycles. The ABS may use
only 1 bit in signaling/MAC management message to indicate the positive traffic of continuous sleep cycles.
The AMS shall consider positive traffic indication during following sleep cycles if ABS has not sent an
indication to indicate AMS go to sleep.
First
Traffic Check Interval point
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
MS receives ‘Continuous Sleep
Cycle Traffic Indication’ either
piggy-backed with data or via
separate signaling
Frame Element
N
Third
Traffic Check Interval point
Second
Traffic Check Interval point
Frame Element
N+1
Minimum Listening Window
(e.g. length = 2 Frame Elements)
Frame Element
N+2
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
Listening Window Extension
Frame Element
N+M
Frame Element
N+M+1
Minimum Listening Window
(e.g. length = 2 Frame Elements)
Frame Element
N+M+2
Traffic Check Interval (a.k.a. Sleep Cycle)
(length = M Frame Elements)
...
Listening Window Extension
Frame Element
N+2M
Frame Element
N+2M+1
Frame Element
N+2M+2
Minimum Listening Window
(e.g. length = 2 Frame Elements)
MS receives ‘Listening Window End
Indication’ either piggy-backed with
data or via separate signaling
MS receives AAI_TRF-IND at
Listening Window Start
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Fourth
Traffic Check Interval point
Figure 2
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References
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[1] IEEE 802.16m-09/0010r2, “IEEE 802.16m Amendment Working Document (AWD)”
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Listening
Window
Extension
...
Sleep Window
Frame Element
N+3M
IEEE C802.16m-09/1519
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[2] IEEE P802.16 Rev2/D9, “Draft IEEE Standard for Local and Metropolitan Area Networks: Air Interface for Broadband Wireless
Access,” Dec. 2008.
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[3] IEEE 802.16m-08/003r8, “The Draft IEEE 802.16m System Description Document”
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IEEE C802.16m-09/1519
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Proposed text
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[Insert the following text to lines 45 on page 91 of IEEE 802.16m-09/0010r2]
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======================== Start of Proposed Text ========================
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15.2.16.2.3.1. Traffic Indication
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If the traffic indication message is lost or otherwise not detected by the AMS, the AMS shall stay awake for the rest of the Listening
Window. If the AMS receives any unicast data during the listening window, then it shall assume that the traffic indication was positive.
If the AMS receives neither the traffic indication message nor any unicast data in the Listening Window, the AMS shall send a MAC
management message (e.g. a signaling header) to ask the ABS what was the traffic indication for the AMS. The ABS shall respond to
the AMS by unicasting a MAC management message containing the traffic indication for that AMS. If the ABS needs multiple sleep
cycles to transmit DL traffic to a specific AMS, the ABS may unicast a message to indicate the AMS receiving DL traffic during the
following multiple continuous sleep cycles without additional traffic indication in these sleep cycles. The length of each continuous
Sleep Cycle shall be reset to Initial Sleep Cycle.
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……
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======================== End of Proposed Text ========================
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