1. Self-Organization Networks for Disaster Relief IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16gman-10/0015 Date Submitted: 2010-05-05 Source: Sungkyung Kim, Sungcheol Chang, Hyun Lee, E-mail: {cyrano, scchang, csyoon}@etri.re.krcsyoon}@etri.re.kr Eunkyung Kim, Soojung Jung, Jaesun Cha, Chulsik Yoon ETRI Venue: IEEE 802.16 Sesstion #67 Bangalore, India Base Contribution: None Purpose: To assist the 802.16 GRIDMAN SG to define system requirements for 802.16n standard 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. Release: 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. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. Introduction According to the PAR [1], “ This amendment specifies protocol enhancements to the IEEE802.16 MAC for enabling increased robustness and alternate radio path establishment in degraded network conditions. Limited OFDMA PHY extensions are included for enabling operation with radio path redundancy and direct communication between subscriber stations. Also mobile base stations and mobile relay stations are supported.” And, GRIDMAN SG has discussed some usage cases [2]. Among them, we focus on disaster recovery when the ground based communication infrastructure suffers a local or widely destruction.

3. Usage model A Disaster may destroy existing communication infrastructures. And, it can bring about heavy congestion. –Natural disaster: volcano, earthquake, tsunami, hurricane, etc. –Man-made disaster: war, terror, big fire, building collapses, etc.

4. Disaster Relief After a disaster, we have to consider the capability and coverage of BS in a disaster area for rescue and search within a short time. –Establishing temporary BSs/RSs to resolve call-congestion and to recover a degraded communication network. –Utilizing enhanced relay stations and multimode stations to assist incomplete BS, to support alternative paths, and to fill coverage holes in a disaster area, etc.

5. Key Requirements Multi-mode station Mobile Base station Dynamic Self-Organization Network Ability to operate without an attached infrastructures

6. Multi-Mode Station 802.16n shall support a multi-mode station to operate as another station temporarily. –Type Multimode MS: supporting the functions of RS or BS. Multimode RS: supporting the functions of BS. –Features (compared with normal infra-stations) Compact sized-hardware Limited transmission power Limited functions Data source/sink terminal (Multimode MS) –Mode Change Sensing network states/infra-stations deciding a role Dynamic re-configuration With/without infrastructure

7. Mobile Base Station 802.16n shall support a mobile base station which is loaded onto a vehicle to operate in a wide disaster area. –Types Nomadic base station Full mobile base station –Technical issues Dynamic network configuration Handoff with normal base station Ability of BS to measure radio link Interference mitigation Frequency allocation Wireless backhaul communication detached from infrastructures

8. Others Stand-alone network –802.16n shall support a stand-alone network to operate without an attached infrastructures. Protocol termination at stand-alone BS Local authentication & authorization Resource efficiency –Direct communication between subscriber stations Link adaptation Synchronization

9. Summary Key technologies for disaster relief –Multimode station –Mobile base station –Stand-alone network –Self Organization Network

10. References [1] IEEE 802.16gman-10/0018r2, “Draft PAR and Five Criteria from Greater Reliability in Disrupted Metropolitan Area Networks (GRIDMAN) Study Group,” March 2010. [2] IEEE 802.16gman-10/0019r1, “NRR Draft Report,” March 2010. [3] IEEE 802.16gman-10/0014, “Group Calls and Multicast Operation for Public Safety and Public Protection”, May 2010.