1. Abnormal Outage Report in 802.16p Document Number: IEEE C802.16p-10/0032 Date Submitted: 2010/12/31 Source: Hung-Yu Wei, Ching-Chun ChouE-mail: hywei@cc.ntu.edu.tw National Taiwan University (NTU) * 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-10/0032 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

2. IEEE 802.16p SRD Specifications SRD Section 6.2.8 [1] –The 802.16p system shall have the ability to distinguish between “normal power down” (e.g. associated with a voluntary power outage event) and “abnormal power down” (associated with an involuntary power outage event). A reporting mechanism is required for abnormal power down. –Specify the abnormal events, and the normal power down can be distinguished.

3. Problem Statement Last Gasp alarm [2] –Large number of smart meters transition from idle to active state in power outage. Notify the network that they have lost power. Insufficient ranging opportunity –960 VS 70000 access attempts per second [2] 32 initial ranging codes, 200 channels/second => 1% contention probability: 960 access/second 35K device/sector, 500ms access interval => 70000 access/second

4. Proposed Solution M2M_Abnormal_Outage ranging code –An code for abnormal outage reporting An indicator for abnormal outage If the ABS receive this code, the ABS is notified of the abnormal outage. –Then the ABS should allocate the ranging channel for M2M network entry. Especially for last gasp.

5. Illustration for the Proposed Solution Preamble FCH DL burst #0 (UL-MAP) DL burst #2 DL AAI subframes Ranging channel, feedback channel, ACK channel UL burst #0 UL AAI subframes DL-MAP DL burst #3 UL burst #1 DL burst #1 UL burst #2 Preamble FCH DL burst #0 (UL-MAP) DL burst #2 DL AAI subframes Ranging channel, feedback channel, ACK channel M2M network entry channel (Last Gasp Reporting ) UL burst #0 UL AAI subframes DL-MAP DL burst #3 UL burst #1 DL burst #1 UL burst #2 Frame #(k)Frame #(k+1) Ranging Code: M2M_Abnormal_Outage

6. Advantages of the Proposed Solutions The ranging opportunities can be adaptively allocated. –The number of M2M network entry channels –Utilize the information of Number of users The ranging codes can be reused. –We may reuse the existing ranging codes in M2M network entry channel. No longer limited by the 32 initial ranging codes 256 codes, 200 channels => 51200 opportunities More ranging channels are available if the number of M2M network entry channels are increased.

7. Proposed Text 6.3.10.5 M2M Abnormal Power Outage Ranging –An MS may send M2M Abnormal Outage Ranging Code which is defined by Type X in Table 571 to notify the BS of abnormal power outage. –When the BS responds to an M2M Abnormal Outage Ranging Code, and PHY corrections are not needed, the BS shall reserve an M2M network entry channel, specified in the UL-MAP IE, in the next frame for the M2M network entry. –M2M MSs may send a ranging code from M2M Network Entry Ranging Code Set to perform M2M network entry 6.3.10.6 M2M Network Entry Ranging –TBD.

8. Proposed Text (cont.) MSABS Ranging Code for Abnormal Power Outage Report Reserve the M2M Network Entry channel for M2M Network Entry Ranging Ranging Code from M2M Network Entry Ranging Code Set for RNG-REQ M2M Abnormal Power Outage Ranging M2M Network Entry Ranging ………

9. Proposed Text (cont.) NameType (1 byte) LengthValue Start of ranging codes group1551Indicates the starting number, S, of the group of codes used for this UL. If not specified, the default value shall be set to zero. All the ranging codes used on this UL shall be between S and ((S+O+N+M+L+K+J+H) mod 256) where N is the number of initial ranging codes M is the number of periodic ranging codes L is the number of BR codes O is the number of HO ranging codes H is the number of HO ranging codes in HO Ranging Code set 1 J is the number of BR ranging codes in BR Ranging Code set 1 K is the number of Initial ranging codes in Initial Ranging Code set 1 The range of values is 0≤S≤255. Initial Ranging Code Set 12191Number of Initial ranging CDMA codes for soft combining. Possible values are 0-255. Default value is 0 HO Ranging Code Set 12291Number of HO ranging CDMA codes for soft combining. Possible values are 0-255. Default value is 0 BR Ranging Code Set 12211Number of BR ranging CDMA codes for soft combining Possible values are 0-255. Default value is 0 Abnormal Power Outage Ranging CodeX (TBD) 1An indicator for the M2M MS to notify the ABS of abnormal power outage. Table 571 – UCD PHY-specific channel encodings-WirelessmanOFDMA

10. References [1] 802.16p-10/0004r1, “IEEE 802.16p Machine to Machine (M2M) System Requirements Document (SRD) (initial working document revised),”Jin Lee, IEEE 802.16p TG, 2010-11-11 [2] 802.16p-10/0005, “Machine to Machine (M2M) Communications Technical Report,” HanGyu Cho, M2M Technical Report Technical Editor, 2010-11-10