IEEE C802.16p-10/0026
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Change Request to SRD to Support Large Number of Devices
Date
Submitted
2011-01-03
Source(s)
Ming-Hung Tao, Ying-Chuan Hsiao
E-mail: mhtao@itri.org.tw
ITRI
Re:
802.16p SRD Call for Comments
Abstract
This contribution proposes a new group addressing concept for M2M devices.
Purpose
To be discussed and adopted by TGp.
Notice
Release
Patent
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Change Request to SRD to Support Large Number of Devices
Ming-Hung Tao, Ying-Chuan Hsiao
ITRI
1 Introduction
As mentioned in SRD, IEEE 802.16p BS shall provide continuing support for WirelessMAN-Advanced Air
Interface. This statement implies IEEE 802.16p would better to use the 12-bit Station Identifier (STID) to
identify 16m AMSs as well as the M2M devices, so that the enhancement cost can be minimized. However, the
current addressing scheme associated with the 12-bit STID could make it very difficult to satisfy the
requirement of “Large Number of Devices” in IEEE 802.16p. Therefore, a new addressing scheme without
changing the length of STID is desired for IEEE 802.16p.
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IEEE C802.16p-10/0026
This contribution proposes a new addressing concept which groups the M2M devices into multiple M2M device
groups; each M2M device group contains one leader device and multiple follower devices. The M2M devices
belonging to the same M2M device group can share the same device identifier (e.g., STID in 16m), so that the
original addressing scheme can support a huge number of M2M devices without increasing the length of STID.
Accordingly, we need to specify the requirement for this concept which can benefit decreasing the deployment
cost for M2M applications.
2 Categorization of M2M devices
M2M devices are always grouped according to their functionality and their location. User can configure each
M2M device as a leader device or a follower device. In the proposed scheme, there must be one leader device in
a group, and there may be multiple follower devices in a group. As shown in Figure 1, the leader device is
responsible for performing network entry with the base station and obtaining a device identifier for the group.
The follower device doesn’t have to perform network entry, but shall still maintain downlink synchronization
with the target base station.
Network entry
Base station
Leader
device
Follower
device
Figure 1. The M2M device is categorized into either leader device or follower device.
3 Group addressing
Grouping addressing is the key for providing sufficient identifiers to a huge number of M2M devices, while
knowing that the number of STIDs is limited. The key idea is let the M2M devices belonging to the same group
share the same device identifier, and differentiate those devices having the same device identifier by different
connection identifier (e.g., FID in 16m).
Each M2M device will obtain a unique connection identifier, which means an M2M device may have only one
transport connection connected to the base station. The leader device is responsible for exchanging MAC
control messages with the base station, the follower devices shall monitor the control messages exchanged
between the leader device and base station. The leader device and follower devices belonging to the same group
also share the same control connection identifier.
4 Downlink receiving procedure
Taking IEEE 802.16m for example, to receive data from the base station, the M2M device first decodes each A2
IEEE C802.16p-10/0026
MAP to check if there is any resource allocated to the STID of its group. If there is, the mobile station will
capture the resource, receive the PDUs (Protocol Data Units) encapsulated in the resource. The M2M device
will further check whether the FID in each received PDU is the FID assigned to the M2M device. The M2M
device will then process only the PDU whose FID is identical to the FID of the M2M device. Figure 2 shows an
example of this procedure.
A-MAP
STID Location
…
…
172 xxxxx
STID = 172
FID = 5
M2M
Device
A-MAP
A-MAP
A-MAP
A-MAP
DL
Subframe
DL
Subframe
DL
Subframe
DL
Subframe
UL
Subframe
UL
Subframe
UL
Subframe
UL
Subframe
AMS A
PDU #1
PDU #2
…
GMH
(fid = 5)
EH
Payload
PDU #n
PDU = Protocol Data Unit
Figure 2. An example of downlink receiving for a M2M device.
5 UL transmitting procedure
Taking IEEE 802.16m for example, in the uplink (MS to BS) transmission phase, the base station shall check if
the standalone BR header is coming from a M2M device or from a regular 16m mobile station. If the standalone
BR is coming from a M2M device, the base station shall send the M2M device a bandwidth grant message (UL
basic assignment A-MAP IE) including not only STID, but also FID of the M2M device.
6 Text Proposal
Modify the functional requirements described in Section 6.1 and 6.2 as shown.
--------------------------
Begin Text Proposal
-------------------------------
6.1 Low Power Consumption
The 802.16p system shall support mechanisms for low power consumption in M2M devices.
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IEEE C802.16p-10/0026
6.1.1
The 802.16p system shall provide optimized operation for M2M devices with no/low mobility to
conserve power.
6.1.2
The 802.16p system shall support optimized operation for time controlled, time tolerant and in-frequent
traffic to conserve power.
6.1.2.1 The 802.16p system shall support efficient radio resource management for time-controlled and timetolerant traffic.
6.1.3
The 802.16p system shall support longer inactive periods for increased power savings for M2M devices
associated with certain M2M applications.
6.1.4
The 802.16p system may support device collaboration without defining a new 16p peer-to-peer
connection (i.e. all MS data transmissions must be terminated at the BS).
6.2 Large Numbers of Devices
The 802.16p system shall support very large numbers of devices.
6.2.1
The 802.16p system shall be able to identify a large number of devices individually or by group.
6.2.1.1 The 802.16p system shall allow the M2M devices in the same M2M group sharing the same device
identifier.
6.2.2
An 802.16p M2M device shall be able to join one or more M2M groups.
----------------------------- End Text Proposal
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