HR-MS Neighbor Discovery – Use Case 1: Registered HR-MSs Discover Each Other Document Number: IEEE S802.16n-11/0098 Date Submitted: 2011-05-16. Source:

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HR-MS Neighbor Discovery – Use Case 1: Registered HR-MSs Discover Each Other Document Number: IEEE S802.16n-11/0098 Date Submitted: Source: Haiguang Wang, Hoang Anh Tuan, Jaya Shankar, Zhongding Lei, Shoukang Zheng, Yeow Wai Leong, Teo Joseph Chee Ming, Mar Choon Hock Voice: Institution for Infocomm Research (I2R) 1 Fusionopolis Way, #21-01, Connexis (South Tower) Singapore * Re: Call for contributions for n AWD Base Contribution: IEEE C802.16n-11/0098 Purpose: To discuss and adopt the proposed text in the n draft Text Notice: This document does not represent the agreed views of the IEEE 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.

Introduction Section of n SRD: –“HR-Network shall support neighbor and path discovery between HR- MSs as well as between HR-MS and HR-Network infrastructure stations” Neighbor discovery is one of the key enabling mechanisms for: –HR-MS direct communications (DC) –HR-MS forwarding to network (FTN) –Path discovery & management

Use Case 1: Registered HR-MSs Discover Each Other HR-BS HR-MS1 HR-MS2 HR-MS3

Neighbor Discovery for Registered HR-MSs Basic design principles: –Centralized Control: serving HR-BS/HR-RS schedules some HR-MSs to broadcast predefined self-advertizing (PSA) signals so that other HR-MSs can try to detect and verify their neighbor relationship –Design reuse: PSA signal is some predefined sequence in /802.16m => using ranging preambles –Low cost: serving HR-BS/HR-RS schedules neighbor discovery as and when needed, and for selected stations

Ranging-based Neighbor Discovery Procedures: - The serving HR-BS/HR-RS schedules one or multiple registered HR-MSs to broadcast PSA sequences in assigned channels. Multiple HR-MSs may share the same PSA signal or the same channel PSA sequence or the same assigned channel, but not both. - The serving HR-BS/HR-RS also schedules some other HR-MSs to listen on those ranging channels scheduled for PSA signals. - Each HR-MS that is scheduled to receive PSA sequences shall determine what sequences it can properly decode, together with related information such as estimations of time/frequency offsets and signal strength. - The receiving HR-MSs may report their measurements to the serving HR-BS/HR-RS. Whether a receiving HR-MS should report its measurements can be based on a threshold.

Proposed Text Neighbor Discovery for Registered HR-MSs For registered HR-MSs to discover each other, the serving HR-BS/HR-RS shall schedule some HR-MSs to broadcast predefined self-advertizing (PSA) signals so that other HR-MSs can try to receive and verify their neighbor relationship. Either ranging preambles or frame preambles (FFS) can be used as PSA signals. The process of neighbor discovery for registered HR-MSs is as follows: - The serving HR-BS/HR-RS schedules one or multiple registered HR-MSs to broadcast PSA sequences in assigned channels. Multiple HR-MSs may share the same PSA signal or the same channel PSA sequence or the same assigned channel, but not both. - The serving HR-BS/HR-RS also schedules some other HR-MSs to listen on those ranging channels scheduled for PSA signals. - Each HR-MS that is scheduled to receive PSA sequences shall determine what sequences it can properly decode, together with related information such as estimations of time/frequency offsets and signal strength. - The receiving HR-MSs may report their measurements to the serving HR-BS/HR-RS. Whether a receiving HR-MS should report its measurements can be based on a threshold. The serving HR-BS/HR-RS can determine neighbor topology based on reported measurements of transmitted PSA signals. The HR-MS is also able to construct a one hop neighborhood map that may be used for different purposes. How HR-BS/HR-RS/HR-MS construct neighbor topology is outside of the scope of this standard.