Group-based M2M solutions
Document Number:
IEEE C802.16p-11/0013
Date Submitted:
2010/03/03
Source:
Honggang Li, Rui Huang, Shantidev Mohant
E-mail: honggang.li@intel.com
Intel Corp.
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802.16p amendment text
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IEEE C802.16p-11/xxxx
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March 2011
Intel Corp.
Slide 1
Abstract
• This presentation discusses the candidate
solutions to meet the requirements defined in
SRD, based on M2M devices grouping.
March 2011
Intel Corp.
Slide 2
Functional requirements of 16p
•
•
•
•
•
Low power consumption
Large numbers of devices
Small burst transmissions
Security support
We discuss the candidate solutions to the
requirements of low power consumption and
large numbers of devices
March 2011
Intel Corp.
Slide 3
Low power consumption
Non-grouping M2M transmission
•
•
Both transmit power and processing power make contribution to the power consumption of an
M2M device.
To save transmit power, the straightforward way is to group co-located M2M devices and relay
M2M traffic by a relay station
–
•
Grouping M2M transmission
>10dB can be saved for pathloss of most of M2M devices transmission
Delta of Pathloss
BS-MS vs. RS-MS(LOS)
BS-MS vs. RS-MS(NLOS)
Rcell=1000m, Rrelay=100m
45dB
10dB
Rcell=300m, Rrelay=30m
32dB
12dB
And M2M grouping can shorten the transmission time due to better channel quality and higher
data rate, so that the processing power can be saved.
March 2011
Intel Corp.
Slide 4
Large numbers of devices
• Most of M2M devices are cluster-type deployed, e.g. in a
home, floor, warehouse etc.
• A cluster of devices can share a same connection with the BS,
and aggregate the transmissions to simplify the air interface
design due to
– Lighter load compared with random access from large numbers of
devices
– Less interference
March 2011
Intel Corp.
Slide 5
Solutions to M2M grouping
• 16m relay M2M grouping
– In a group, there is a relay station between M2M devices and the BS, the RS
can also be an M2M device
– Because only the RS communicates with the BS, most of M2M devices can
work in low power
– The RS can support M2M data aggregation, so that multiple reports from
M2M devices can be collected and packed in one PSDU or MSDU regarding if
the destination addresses are the same one or not, to improve the spectral
efficiency in relay link
• Dual mode(het-net) M2M grouping
– The dual-mode device can be used to forward the traffic between the BS and M2M
devices, the dual-mode device can be WiMAX Femto or hotspot
– Similar like 16m relay grouping, except that the access link between the RS
and other M2M devices can be 802.11 or other air interface
• Group-based channel allocation and transmission
– Some of control process can done by one of devices of the group and shared
with other devices, e.g. group-based bandwidth request and channel
allocation
March 2011
Intel Corp.
Slide 6
16m Relay M2M Grouping
An example of 16m relaybased M2M in TDD
•
•
•
M2M relay station is the relay station with M2M enhancements, e.g. data aggregation
Pros
–
Reuse the relay station definition in 16m, save the Tx power of M2M devices and reduce the access
load of the BS, data aggregation can improve spectral efficiency furthermore
Cons
–
–
March 2011
The deployment relies on the RS-functioned station
Frame structure, the relay zone occupies at least one subframe, which waste radio resource
sometime
Intel Corp.
Slide 7
Dual-mode(het-net) M2M Grouping
•
•
•
A station is responsible for forwarding the traffic between the BS and M2M devices, this station can be a
M2M device also, the air interface to M2M devices can be based on 802.11 or other short-range ones.
Pros
–
–
–
Save the Tx power of M2M devices and reduce the access load of the BS, data aggregation can improve
spectral efficiency furthermore
No 16m relay required
16m network offloading
Cons
–
March 2011
At least one dual-mode station is required in a group
Intel Corp.
Slide 8
Group-based signaling sharing
based on 16m group
T2
T1
T1
t
u1
u3
u1
u2
u3
u1
u2
u3
u2
u5
u4
•
•
u5
u6
u4
M2M devices in group 1
Radio resources allocated to group 1
M2M devices in group 2
Radio resources allocated to group 2
u6
For co-located M2M devices, multiple M2M devices can transmit within a Tx window,
one of them can request bandwidth in the name of group, and share similar
transmission parameters such as Tx power, MCS etc.
Pros
– The group-oriented control signaling can save the signaling overhead in N(No.of M2M devices
in a group) times roughly compared with non-grouped solution
– No requirement of 16m relay or dual-mode station
•
Cons
– There are still traffic data and ACK between the BS and each M2M device
March 2011
Intel Corp.
Slide 9
Comparison among three candidates
Grouping
solutions
or Signaling
Dual mode 16m
Relay Peer2peer
other
mechanism
required
required
overhead
Power
consume
Efficiency of
channel usage
802.16m relay
No
Yes
No
Low
Low
Middle**
Dual-mode
group
Yes*
No
No
Low
Low
High
No
No
Middle
High
Low
required
802.16m
No
signaling sharing
* At least one dual-mode device is required as relay station
** due to relay zone allocation
March 2011
Intel Corp.
Slide 10
Proposed text
• Group-based M2M transmission of control and traffic should
be supported to meet the requirements of 16p SRD[]. The
group-based M2M transmission can be based on 802.16m
relay, or Het-net dual-mode forwarding, or non-forwarding
signaling sharing mechanisms. Which mechanism to be
selected in 16p is to be decided.
March 2011
Intel Corp.
11
References
• [1] Jin Lee, “IEEE 802.16p Machine to Machine (M2M) System
Requirements Document”, IEEE 802.16p-10/0004r2
• [2] Roshni Srinivasan , “IEEE 802.16m Evaluation Methodology
Document (EMD)“, IEEE 80216m-08_004r5
• [3] IEEE P802.16m/D11
March 2011
Intel Corp.
Slide 12