1. Two-hop Operation to Relay Packets between Two TDC Links
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16n-11/0241
Date Submitted:
Source:
Sungcheol Chang, Seokki Kim, Eunkyung Kim, Miyoung Yun, Won-Ik Kim,
Sungkyung Kim, Hyun Lee, Chulsik Yoon, Kwangjae Lim
ETRI
Venue:
Call for Comments on the a Draft AWD <80216n-11_0025>
Base Contribution:
IEEE C802.16n-11/0241
Purpose:
To be discussed and adopted by TG802.16n
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2. This contribution provides two-hop operation of TDC
Introduction
802.16n SRD describes two-hop operations of MS to MS direct communication
But, a Draft AWD does not contain two-hop operation of talk-around direct communication(TDC).
This contribution provides two-hop operation of TDC

3. Two-hop Operations of TDC
Relaying packets on a unicast TDC link
An originating HR-MS sends packets on a TDC link
A terminating HR-MS receives packets on other TDC link
A Relaying HR-MS receives the packets from the originating HR-MS and sends the packets to the terminating HR-MS.

4. Two-hop Operations of TDC
Advertising a relaying HR-MS
Relaying HR-MS broadcasts AAI-DC-RELAY-ADV message periodically
All HR-MSs receives the message
Establishing a relaying TDC link
An HR-MS selects a relaying HR-MS for establishment of a relaying TDC link
The HR-MS requests the relaying HR-MS to establish a relaying TDC link using AAI-DC-RELAY-REQ/RSP messages.
The relaying HR-MS establishes the relaying TDC link to target HR-MS using AAI-DC-LEST-REQ/RSP messages.

5. Two-hop Operations of TDC
Relaying packets on a multicast TDC link
An originating HR-MS sends packets on a TDC link
Terminating HR-MSs receive packets on other TDC link
A Relaying HR-MS receives the packets from the originating HR-MS and sends the packets to the terminating HR-MSs.
This provides a fixed service coverage
Terminating HR-MSs are Rx MSs

6. Two-hop Operations of TDC
Token management for PTT (1:N) application
If MS1 finishes sending packets, it pass the PTT token using AAI-DC-TKN-HO.
Relaying MS broadcasts token status using AAI-DC-TKN-ADV
MS2 requests the PTT token using AAI-DC-TKN-REQ/RSP
Relaying MS pass the PTT token to MS2 using AAI-TKN-HO

7. Proposed text for 16.1a AWD See IEEE C802.16n-11/0241.doc
Remedy1 for AWD texts of two-hop operations
Advertising a relaying HR-MS
Two links management
Token management
Remedy2 to add details of MAC messages
AAI-DC-RELAY-ADV
AAI-DC-RELAY-REQ
AAI-DC-RELAY-RSP