1. Text Proposals of PHY Control Structure for 16n Direct Communication
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16n-11/0072
Date Submitted:
Source:
Sungcheol Chang, Eunkyung Kim, Sungkyung Kim, Hyun Lee, Chulsik Yoon ,
ETRI
Venue:
Call for Comments on the n Amendment Working Document < 80216n-10_0049r1.pdf >
Base Contribution:
IEEE C802.16n-11/0072
Purpose:
To be discussed and adopted by TG802.16n
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2. Introduction
A set of contributions to meet key requirements from PPDR applications
C802.16n-11/0071: Frame Structure and PHY Structure
Distributed resource allocation for talk-around direct communication
Narrowband signal transmission for service coverage extension
C802.16n-11/0072: PHY Control Structure
C802.16n-11/0073: MAC Control Operations

3. Channel Structure of Talk-around DC
Synchronization Channel
Synchronization among HR-MSs.
The HR-MSs within the BS coverage provide synchronization to the HR-MSs out of the BS coverage.
Contention Channel
The HR-MSs exchange packets including resource sharing information with random access.
Dedicated Channel
The HR-MSs with resource information of dedicated channel exchange packets on the dedicated channel.

4. Synchronization Channel
This channel provides synchronization among HR-MSs
Fixed position and fixed size resources.
Synchronization packets (preamble + ID) are transmitted with distributed transmission scheduling.
The HR-MS decides to transmit the synchronization packet by itself.
Preamble time of BS is propagated to the HR-MSs out of the service coverage.
Synchronization hop counter

5. Contention Channel
The channel provides random access and transmission of a fixed size packet. There are several slots parallel to each other.
Content fields in the fixed size packet.
Source ID
Destination ID
Unicast STID for unicast transmission
Group multicast ID for multicast transmission
Resource identification of a dedicated channel for closed users.

6. Dedicated Channel The HR-MSs share resource information.
An HR-MS send a packet on the dedicated channel and the other MSs receive the packet.
Unicast transmission or multicast transmission.
The resource of a dedicated channel repeats every superframe (20ms).
Circuit style resource usage to reduce control overhead.
Voice packets with a period of 20ms.
The resource management and PTT operation are done by management packets.
No control and feedback channels are defined additionally.

7. Dedicated Channel
To provide both narrowband and broadband signal transmissions
Narrowband signal on 1/6 PRU resource for voice traffic
High-data rate over multiple 1/6 PRU resources

8. Proposed text for 16n AWD
See IEEE C802.16n-11/0072.doc to support talk-around direct communication from PPDR application
A physical control structure
Synchronization channel
Contention channel
Dedicated channel
Narrowband signal transmission for voice traffic
Broadband signal transmission for high-rate data application