1. Frame Structure for Talk-around Direct Communications
Document Number:
IEEE S802.16n-11/0152
Date Submitted:
Source:
Young-Ho Jung , Jihoon Choi
Korea Aerospace University
Sungcheol Chang, Seokki Kim, Eunkyung Kim, Miyoung Yun, Won-Ik Kim,
Sungkyung Kim, Hyun Lee, Chulsik Yoon, Kwangjae Lim
ETRI
Re:
Call for comments on the n AWD
Base Contribution:
IEEE C802.16n-11/0152
Purpose:
To be discussed and adopted by TGn
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.
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2. Introduction
Resource allocation for TDC (talk-around direct communication)
Some resources for infra-structure communication are reserved for TDC in the FDM (frequency division multiplexing) manner.
Common Direct Mode Zone (CDMZ): 4 PRUs having highest indices of uplink resources (72 contiguous subcarriers in the frequency domain, see IEEE C802.16n-11/0051r2)
Common Direct Mode Zone – Extended (CDMZ-E): 4 PRUs having highest indices of downlink resources (72 contiguous subcarriers in the frequency domain)
Cell Specific Direct Mode Zone (CSDMZ): determined by each HR-BS independently (UL or DL resource): multiple of 4 PRUs
Frame structure for TDC
CDMZ: The resources assigned for CDMZ are composed of Sync-CH (synchronization channel), Ded-CH (dedicated channel), and Sup-CH (supplementary channel).
CDMZ-E, CSDMZ: Ded-CH, Sup-CH (no Sync-CH)

3. Resource Allocation for TDC
Common Direct Mode Zone (CDMZ): set of uplink PRUs with fixed size and positions which are commonly assigned to all cells (must be CRU)
Common Direct Mode Zone - Extended (CDMZ-E): set of downlink PRUs with fixed size and positions which are commonly assigned to all cells (must be CRU). Use of CDMZ-E is indicated by Sync-CH IE transmitted in CDMZ
Cell Specific Direct Mode Zone (CSDMZ): additionally assigned direct-mode resource blocks independently assigned by each HR-BS (CRU or DRU) and information to receive cell specific direct mode region can be obtained from common direct mode zone

4. Construction of TDC frame (CDMZ)
Example. 3 uplink subframes/ 5msec frame
Synchronization Channel (Sync-CH): 1st subframe of each superframe
Dedicated Channel(Ded-CH): 1st subframe of the 2nd and 4th frame
Supplementary Channel(Sup-CH): the other subframes

5. Resource segmentation for TDC frame (CDMZ)
Example. 3 uplink subframes/ 5msec frame

6. Resource segmentation for TDC frame (CDMZ-E, CSDMZ)
Example. 3 uplink subframes/ 5msec frame

7. PHY Channels for TDC Synchronization Channel (Sync-Ch)
Includes 6 OFDM symbols (1st subframe of each superframe in CDMZ)
The Sync-CH uses 72 contiguous subcarriers in the frequency domain
In the time domain, first three symbols are used for the Sync-CH preamble (P-SCH1) and last three symbols are used for the Sync-CH message (P-SCH2)
See IEEE C802.16n-11/0153 for more details

8. PHY Channels for TDC Dedicated Channel(Ded-CH)
Dedicated sub-channel: set of 12 mRBs allocated across all assigned PRUs in the same slot (to obtain freq. diversity)
Transmit data packets and control packets
See IEEE C802.16n-11/0160 for more details
The number of dedicated sub-channels according to Nsubframe_per_fame (CDMZ)
The number of dedicated sub-channels according to Nsubframe_per_fame (CDMZ-E, CSDMZ)
Nsubframe_per_fame
The number of dedicated sub-channels in the slot 1
(Nded-subchannel,1)
The number of dedicated sub-channels in the slot 2
(Nded-subchannel,2)
Total number of dedicated sub-channels
(Nded-subframe) 2 3 5 4 9 6 7 13 8 17
Nsubframe_per_fame
The number of dedicated sub-channels in the slot 1
(Nded-subchannel,1)
The number of dedicated sub-channels in the slot 2
(Nded-subchannel,2)
Total number of dedicated sub-channels
(Nded-subframe) 2 3 6 5 10 4 7 14 9 18

9. PHY Channels for TDC Dedicated Channel(Ded-CH)
mRB assignment method for dedicated subchannels
Step 1: For each slot 12 successive mRBs are temporally assigned from subframe 1 to subframe Nded-subframe,1 in slot 1, and from subframe Nded-subchannel,1+1 to subframe Nded-subchannel,1 + Nded-subchannel,2 in slot 2, in time first manner.
Step 2: For each subframe mRBs are permuted by using the permutation sequence generated by using the method in with parameters of M=12, and SEED = 343*subframe index

10. PHY Channels for TDC Supplementary Channel (Sup-CH)
Supplementary sub-channel: set of 4 mini-tiles in the same subframe
mini-tile: 2 subcarriers x 5 OFDM symbols (6th OFDM symbol is empty symbol (guard time) for Tx. Rx. switiching time
Sup-CH for Ded-CH in slot 1 exists in slot 2, and Sup-CH for Ded-CH in slot 2 exists in slot 1 (1:1 correspondence between a supplementary sub-channel and a dedicated sub-channel)
Transmits indication of MAC messages, PHY signalings and short feedback messages related with the corresponding dedicated sub-channel
See IEEE C802.16n-11/0153 for more details
Assignment of mini-tiles for the supplementary subchannel
For the n-th supplementary subchannel, four mini-tiles with indices of mod(mini-tile index-1, 9)+1 = mod(n-1, 9)+1 in the different slot are assigned
Example: for the 5-th supplementary subchannel, mini-tile 5, 14, 23 and 32 are assigned

11. Proposed Text
See IEEE C802.16n-11/0152