1. IEEE P802.22 Wireless RANs Date: 2009-1-08
January 2009
doc.: IEEE /0021r0
January 2009
Super-frame Structure for Spectrum Sharing and Inter-WRAN Communications
IEEE P Wireless RANs Date:
Author:
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Wendong Hu, STMicroelectronics
Wendong Hu, STMicroelectronics

2. January 2009
doc.: IEEE /0021r0
January 2009
Abstract
This presentation describes a super-frame design for efficient inter-network spectrum sharing and inter-work communications in IEEE This presentation is to (but is not limited to) address the following comments: 131, 132, 136, 149, 150.
Wendong Hu, STMicroelectronics
Wendong Hu, STMicroelectronics

3. Proposed Super-frame Structure
January 2009
Proposed Super-frame Structure
Wendong Hu, STMicroelectronics

4. Super-frame Control Header
January 2009
Super-frame Control Header
Format
System Type: IEEE WRAN
Other common info…
Header Check Sequence
Contain common (the same) system information across all WRAN systems on the same channel
Simultaneous transmissions of SCHs containg different header contents will results in SCH collisions.
Transmitted simultaneously by all WRANs on the same channel
Enable efficient WRAN detection/discovery
Wendong Hu, STMicroelectronics

5. CBP PDU Three-symbol CBP PDU SCI format in a CBP PDU
January 2009
CBP PDU
Three-symbol CBP PDU
CBP Preamble
CBP Header
Superframe Control Information (SCI)
CBP IEs and other Payload
SCI format in a CBP PDU
System Type: IEEE WRAN
WRAN ID
Frame Reservation MAP in the current super-frame
Frame allocation for Data Services
Frame allocation for Quiet Periods
Self-coexistence Window (SCW) Reservation MAP
Other Information
Wendong Hu, STMicroelectronics

6. Coexistence Communications (Co-channel)
January 2009
Coexistence Communications (Co-channel)
WRANs use SCWs (reserved or random-access based) to exchange coexistence messages
Negotiation for Frame allocation and SCW allocation for the next superframes
Each WRAN BS uses its last RESERVED SCW to announce the latest negotiation decisions of BW (frame and SCW) allocations to CPEs within the WRAN cell.
Wendong Hu, STMicroelectronics

7. January 2009
The “J” SCW
The “J” SCW, which is the last SCW in every Super-frame, is accessed through CSMA (carrier sensing multiple access) by ALL WRANs on a particular RF channel.
Used complementarily with the reserved SCWs, the purposes of the “J” SCW is to allow, for example
A newly operating WRAN to communicate with the existing WRANs or with the other newly starting WRANs for spectrum resource reservation or contention (i.e. data frames or SCWs reservations), group joining, or other inter-WRAN communications purposes
A WRAN that doesn’t have any SCW reservation to communicate with the other WRANs.
Wendong Hu, STMicroelectronics

8. Coexistence Communications (Cross-channel)
January 2009
Coexistence Communications (Cross-channel)
Step 1: Discover the SCW reservation pattern on a out-of-band RF channel (ChX)
Step 2: Identify the reserved SCWs (i.e. TXOPs) of the source WRANs (the ones to which the receiving WRAN intends to listen) on ChX from the discovered SCW pattern.
Step 3: Receive CBP packets during the reserved SCWs of the source WRANs on ChX, or during the J-SCW of ChX in which the source WRAN could also transmit CBP packets.
Wendong Hu, STMicroelectronics

9. January 2009
References
Wendong Hu, STMicroelectronics