1. 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. * http://standards.ieee.org/faqs/affiliationFAQ.html Re: 802.16p amendment text (CfC: Project 802.16p Amendment Working Document Content) Base Contribution: IEEE C802.16p-11/xxxx Purpose: To be discussed and adopted in the AWD by the 802.16p M2M TG Notice: 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. Copyright Policy: The contributor is familiar with the IEEE-SA Copyright Policy. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and..html#6sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat March 2011Slide 1Intel Corp.

2. March 2011 Intel Corp. Slide 2 Abstract This presentation discusses the candidate solutions to meet the requirements defined in SRD, based on M2M devices grouping.

3. 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 2011Slide 3Intel Corp.

4. Low power consumption 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 – >10dB can be saved for pathloss of most of M2M devices transmission 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. Non-grouping M2M transmissionGrouping M2M transmission March 2011Slide 4 Intel Corp. Pathloss savingBS-MS vs. RS-MS(LOS)BS-MS vs. RS-MS(NLOS) R cell =1000m, R relay =100m45dB10dB R cell =300m, R relay =30m32dB12dB

5. 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 2011Slide 5Intel Corp.

6. 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 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 signaling 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 2011Slide 6Intel Corp.

7. 16m Relay M2M Grouping 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 – The deployment relies on the RS-functioned station – Frame structure, the relay zone occupies at least one subframe, which waste radio resource sometime An example of 16m relay- based M2M in TDD March 2011Slide 7Intel Corp.

8. 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 between the BS and the forwarding station can be based on 16e/16m, and the air interface to M2M devices can be based on 802.11 or other short-range technologies. 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 – At least one dual-mode station is required in a group March 2011Slide 8Intel Corp.

9. Group signaling based on 16m/16e 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 a set of transmission parameters such as power control, MCS selection, MIMO mode etc. Option 1: 16m Group Resource Allocation Option 2: group-based signaling based on 16e 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 forwarding station Cons – There are still traffic data and ACK between the BS and each M2M device March 2011Slide 9Intel Corp.

10. Comparison among three candidates Grouping solutions Dual mode required 16m Relay required Signaling overhead Power consume Efficiency of channel usage 802.16m relayNoYesLow Middle** Dual-mode group Yes*NoLow High 802.16m/16e Group signaling No MiddleHighLow * At least one dual-mode device is required as relay station ** due to relay zone allocation March 2011Slide 10Intel Corp.

11. Proposed text [Add the following text after line 11 in page 16 of Section 16.2.1] 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 2011Intel Corp.11

12. 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 2011Slide 12Intel Corp.