A Procedure to Setup HR-MS to HR-MS Direct Communication with Supporting from Infrastructure Stations
Document Number:
IEEE S802.16n-10/0007
Date Submitted:
14/03/2011
Source:
Haiguang Wang, Hoang Anh Tuan, Jaya Shankar,
Shoukang Zheng, Yeow Wai Leong, Joseph Teo Chee Ming,
Mar Choong Hock
Insittute for Infocomm Research (I2R)
1 Fusionopolis Way, #21-01, Connexis (South Tower)
Singapore 138632
Re:
*< http://standards.ieee.org/faqs/affiliationFAQ.html
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Call for contributions for 802.16n AWD
Base Contribution:
IEEE C802.16n-11/0007
Purpose:
Voice:
E-mail:
+65 64082256 hwang@i2r.a-star.edu.sg
To discuss and adopt the proposed text in the 802.16n draft Text
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.
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Abstract
• In this proposal, we proposed a procedure for
HR-networks in setting up HR-MS direct communication in HR-BS or HR-RS appears in the network.

System Requirement

Usage Scenarios
HR-
BS
HR-
MS
(a)
HR-
MS
HR-
BS
HR-
RS
HR-
MS
(b)
HR-
MS

Procedure to Setup Communications between
MSs under the Same HR-BS/HR-RS
Core
Network MS1 MS2 HR-BS/HR-RS
New flow from application layer
DSA_REQ
DSA_ACK
DATA
DSA_RSP
DATA
DATA DSA_REQ
DSA_RSP
DSA_ACK
DATA

State of the Arts
• Existing standards, including 802.16-2009,
802.16m, does not support MS to MS direct communication.
• Modifications to the procedure and signaling exchange are required to supporting the HR-
MS to HR-MS direct communication.

MS1
New flow from application layer
Proposed Modification
MS2 BS
DSA_REQ
DSA_REQ
Detect the feasibility Direct
Communication
DSA_RSP
DSA_ACK
DSA_RSP
RNG
DSA_ACK
RNG
DATA and ARQ
RNG
RNG
DATA and ARQ
Termination of direct communication
Termination of direct communication
Core
Network

Summary
• In this contribution, we provide a procedure for 802.16n HR-MS in setting up direct communication link with the help from infrastructure stations.

Proposed Text
• 17.3.2 Direct communication between HR-MSs
When HR-MS associate to an HR-BS/HR-RS and the functionalities of direct communication are turned on, HR-BS/HR-RS should check DSA_REQ messages received from HR-MS and determine whether HR-MS direct communication should be adopted for this follow. The HR-BS/HR-RS can use the destination IP address and the HR-MS neighboring table maintained at the HR-BS to determine whether a direct communication should be setup or not. If the HR-BS/HR-RS decides that a direct communication should be setup between the source and destination, then it should take following procedure to setup the direct communication link and perform data transmission.
1) The HR-BS/HR-RS should hold on the DSA_RSP to the source HR-MS.
2) The HR-BS/HR-RS should allocate flow_id and radio resource for the direct communication.
3) The HR-BS/HR-RS should transmit a DSA_REQ to the destination, which contains the flow_id and radio resource information for the direct communication.

Proposed Text: Continued
4) On receiving the DSA_REQ, the destination HR-MS should reply with
DSA_RSP.
5) The HR-BS/HR-RS should generate a DSA_ACK to the destination HR-MS on receiving the DSA_RSP. At the same time, the HR-BS/HR-RS should send the delayed DSA_RSP to source HR-MS, which contains the same flow_id and radio resource as sent to destination HR-MS.
6) On receiving the DSA_RSP, the source HR-MS should send a DSA_ACK to the
HR-BS/HR-RS.
7) After sending the DSA_ACK, the source and destination should start to synchronize process on the direct communication link using ranging signals. The HR-BS/HR-
RS may signal a specific ranging code to the source and destination HR-MS. The source HR-MS should send a ranging signal to the destination HR-MS first and the destination HR-MS should response with a ranging signal after receiving it.
8) Once the synchronization process is finished, the source HR-MS can transmit data on the direct communication link. The destination HR-MS may also transmit the
ARQ information on the direct communication link.
9) Synchronization on the direct communication link may be performed periodically.
The synchronization can be done similar as initial synchronization with a pair to ranging signals.
10) Once the direct communication should be ended, the source and destination HR-
MS should send signaling to the HR-BS/HR-RS to terminate the direct communication.