IEEE C802.16n-11/0007
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
A Procedure to Setup HR-MS to HR-MS Direct Communication with Supporting from
Infrastructure Stations
Date
Submitted
2011-03-06
Source(s)
Haiguang Wang, Hoang Anh Tuan, Jaya
Shankar, Shoukang Zheng, Yeow Wai
Leong, Joseph Teo Chee Ming, Mar
Choong Hock
Voice: +65 6408-2256
E-mail: hwang@i2r.a-star.edu.sg
Institute for Infocomm Research
1 Fusionopolis Way, #21-01, Connexis
(South Tower)
Singapore 138632
Re:
Call for contributions for 802.16n AWD
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.
Purpose
To discuss and adopt the proposed text in the 802.16n draft Text
Notice
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A Procedure to Setup HR-MS Direct Communication with Supporting
from Infrastructure Station
Haiguang Wang, Hoang Anh Tuan, Jaya Shankar,
Shoukang Zheng, Yeow Wai Leong
Institute for Infocomm Research (I2R)
1 Fusionopolis Way, #21-01, Connexis South Tower
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IEEE C802.16n-11/0007
Singapore 138632
1. Introduction
HR-MS to HR-MS direct communication is new feature for IEEE 802.16 networks. It will be defined in the
IEEE 802.16n amendment. This feature will significantly improve the capability of HR-MS in various harsh
environment and increase network throughput when local traffic dominates the network.
In 802.16n System Requirement Document [1] section 6.1.3.1, it says that “HR-MS shall provide direct
communication i.e. the origination and termination of the data are at the HR-MS. Association establishment
procedure of an HR-MS to another HR-MS shall be supported.”.
Since the requirement does not set constraint on whether HR-MSs have associated to an infrastructure
stations, in this contribution, we assume an HR-BS is presented in the network and the HR-MSs involved in the
direct communication are associated to the same HR-BS or HR-RS.
2. HR-MS to HR-MS Direct Communication
Supporting the HR-MS to HR-MS direct communication is required by IEEE 802.16n network. The HR-MS
direct communication can happen with our without the supporting form infrastructure nodes. In this
contribution, we focus on the use cases of two HR-MS either direct under the same HR-BS or the same HR-RS
as figure 1 shows. We provide solutions for HR-MS direct communication link setup between HR-MSs.
HRBS
HRRS
HRBS
HRMS
HRMS
HRMS
HRMS
(a)
(b)
Figure 1: Use cases of HR-MS to HR-MS direct communication with infrastructure stations
With existing IEEE 802.16 protocols, direct communication between MS is not possible. If an MS want to
communicate to another MS, following procedures and signaling exchanges are required to deliver data packets
from one MS to another MS under the same infrastructures, for example, a BS.
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IEEE C802.16n-11/0007
MS1
MS2
Core
Network
HR-BS/HR-RS
New flow from
application layer
DSA_REQ
DSA_RSP
DSA_ACK
DATA
DATA
DSA_REQ
DATA
DSA_RSP
DSA_ACK
DATA
Figure 2: Procedures and signaling exchange for MS to MS communication with existing 802.16 protocols
To enable the HR-MS to HR-MS direct communication, a few issues need to be considered, for example:
 Detect the feasibility of direct communication.
 Allocate resource for direct communication.
 HR-MS link synchronization
 Data transmission
Therefore, we may need change above procedure to setup HR-MS direct communication with help from
infrastructure stations. The changes are illustrated in the Figure 2 and our explanations to the procedure are as
follows:
 Since the DSA_REQ contains the source and destination IP address of the flow and the HR-BS/HR-RS
can get the information of destination node based on their IP address and therefore knows whether the
source and destination node can set up a direct communication link or not based on the neighbor table.
The HR-BS/HR-RS should maintain a neighbor table since neighbor discovery is required by the
802.16n system.
 If a direct communication link can be setup between the source and destination node, then the HRBS/HR-RS holds on the transmission of DSA_RSP to the source node. It allocates flow_id and radio
resource for the communication based on their link quality.
 The HR-BS/HR-RS notifies the destination HR-MS of the flow information, including the flow_id and
radio resource allocated, by sending a DSA_REQ.
 On receiving the DSA_REQ, the destination HR-MS should response with a DSA_RSP to the HR-BS.
On receiving the DSA_RSP, the HR-BS/HR-RS should reply a DSA_ACK to the destination HR-MS.
And at the same time, the HR-BS/HR-RS should send the DSA_RSP, which also including the same
flow_id and radio resource allocated, to the source HR-MS.
 On receiving the DSA_RSP, the source HR-MS reply with a DSA_REQ. At this stage, a direct
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IEEE C802.16n-11/0007





communication link is considered being setup by the source and destination HR-MS with the help from
HR-BS/HR-RS.
After sending out the DSA_ACK to HR-BS/HR-RS, the source and destination HR-MS should start a
link synchronization process. Ringing signal can be sent for synchronization. We propose that the source
HR-MS send a ranging signal to the destination HR-MS first on the assigned direct communication link
and the destination HR-MS send back a ranging signal for both ranging and acknowledgement purpose.
After the link synchronization process is successfully performed, the source HR-MS can now send data
packets to the destination HR-MS once it gets the transmission opportunity.
The destination HR-MS may transmit ARQ information on the direct communication link also.
A periodic synchronization between the source and destination HR-MS may be performed since the
topology is dynamic. A pair of ranging signal should be exchanged between the source and destination
HR-MS.
The direct communication link may be terminated once the data transmission is finished.
MS1
MS2
New flow from
application layer
BS
Core
Network
DSA_REQ
Detect the feasibility Direct
Communication
DSA_REQ
DSA_RSP
DSA_ACK
DSA_RSP
DSA_ACK
RNG
RNG
DATA and ARQ
RNG
RNG
DATA and ARQ
Termination of direct
communication
Termination of direct
communication
Figure 3: The procedure of direct communication establishment between HR-MS
3. 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.
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4. Text Proposal for IEEE 802.16n AWD
Note:
The text in BLACK color: the existing text in AWD
The text in RED color: the removal of existing AWD text
The text in BLUE color: the new text added to the Multi-Carrier DG Text
[-------------------------------------------------Start of Text Proposal---------------------------------------------------]
[Adopt the following text in the 802.16n Document (XXX --- document number)]
16.3.2 Direct communication between HR-MSs
When HR-MS associate to an HR-BS and the functionalities of direct communication are turned on, HR-BS
should check DSA_REQ messages received from HR-MS and determine whether HR-MS direct
communication should be adopted for this flow. 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 decides that a direct communication should be setup between the source and
destination HR-MS, then it should take following procedure to setup the direct communication link and perform
data transmission.
1) The HR-BS should hold on the DSA_RSP to the source HR-MS.
2) The HR-BS should allocate flow_id and radio resource for the direct communication.
3) The HR-BS should transmit a DSA_REQ to the destination, which contains the flow_id and radio
resource information for the direct communication.
4) On receiving the DSA_REQ, the destination HR-MS should reply with DSA_RSP.
5) The HR-BS should generate a DSA_ACK to the destination HR-MS on receiving the DSA_RSP. At the
same time, the HR-BS 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.
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 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 HRMS 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 to terminate the direct communication.
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 flow. 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
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IEEE C802.16n-11/0007
setup or not. If the HR-BS/HR-RS decides that a direct communication should be setup between the source and
destination HR-MS, then it should take following procedure to setup the direct communication link and perform
data transmission.
11) The HR-BS/HR-RS should hold on the DSA_RSP to the source HR-MS.
12) The HR-BS/HR-RS should allocate flow_id and radio resource for the direct communication.
13) 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.
14) On receiving the DSA_REQ, the destination HR-MS should reply with DSA_RSP.
15) 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.
16) On receiving the DSA_RSP, the source HR-MS should send a DSA_ACK to the HR-BS/HR-RS.
17) 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.
18) 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.
19) 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.
20) 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.
[-------------------------------------------------End of Text Proposal----------------------------------------------------]
References
[1] IEEE 802.16n-10/0048, “802.16n System Requirements Document including SARM annex”, January 2011.
[2] IEEE 802.16n-10/0049, “802.16n Table of Contents for Amendment Working Draft”, January 2011.
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