1. Inter-Cell Quiet Period Synchronization
Nov. 2009
doc.: IEEE /0117r0
Nov. 2009
Inter-Cell Quiet Period Synchronization
IEEE P Wireless RANs Date:
Authors:
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Cheng Shan, Samsung Electronics

2. Nov. 2009
doc.: IEEE /0117r0
Nov. 2009
Abstract
This contribution proposes an improved method to improve the efficiency when distributing QP scheduling to neighboring cells
This contribution provides a suggested resolution for comment 652
Cheng Shan, Samsung Electronics

3. QP Synchronization as in D2.0
Nov. 2009
QP Synchronization as in D2.0
SCH (Table 1)
the QP information in SCH includes the start time of a QP, as well as the duration of QP
On which TV channel the present QP is scheduled is not defined
“The BS that receives information about other collocated cells (either directly or reported by CPEs) shall synchronize with all quiet periods scheduled by the other cells, which includes those for both intra frame and inter-frame sensing.”
Cheng Shan, Samsung Electronics

4. Problem with Global Synchronization
Nov. 2009
Problem with Global Synchronization
Synchronizing to any QP information regardless if it is in-band or out-band is not efficient if the two cells are operating on two channel so far apart that QP synchronization is unnecessary.
Cheng Shan, Samsung Electronics

5. Problem with In-band Synchronization
Nov. 2009
Problem with In-band Synchronization
If a WRAN cell follows the QP only when the present cell is working on one of the in-band channel where the QP is received
(a) as QP scheduling propagates, cell 4 working on channel N+3 must follow the QP originally scheduled on channel N;
(b) cell 3 working on in-band channel N+1 may not follow the QP relayed by cell 2, since N+1 is not in-band with N-1;
(c) cell 2 may not relay the QP of cell 1 to cell 3 which is in-band with cell 1
Cheng Shan, Samsung Electronics

6. Improved QP Distribution
Nov. 2009
Improved QP Distribution
When delivering/relaying QP information to the neighboring cells, the channel index on which the QP is originally scheduled should be transmitted along;
On receiving the QP information from neighboring cells, a WRAN should
synchronize to the QP as described in if the QP is scheduled on its in-band channel
not necessarily synchronize to the QP if the QP is scheduled on its out-band channel. The BS should instead relay the QP information to its neighbors in its SCH and/or CBP
Cheng Shan, Samsung Electronics

7. Proposed Text Change: Table 1
Nov. 2009
Proposed Text Change: Table 1
Syntax
Size
Notes
Superframe_Control_Header_Format() { …
Channel Number on which QP is originally Scheduled
8 bits
Indicates which channel the QP is originally scheduled on.
TTQP
12 bits
Time To Quiet Period
DQP
4 bits
Duration of Quiet Period }
Cheng Shan, Samsung Electronics

8. Nov. 2009
Propose Text Change:
The BS that receives information about other collocated cells (either directly or reported by CPEs)shall synchronize with all quiet periods scheduled on its in-band channels by the other cells, which includes those for both intra-frame and inter-frame sensing.
Cheng Shan, Samsung Electronics

9. Nov. 2009
Summary
The current SCH definition along with the QP synchronization process described in cannot efficiently handle the inter-cell QP scheduling problem:
Relaying any QP information regardless if it is in-band or out-band may result in QP flooding in the network;
Relaying in-band QP information only cannot efficiently deliver the information to those cells who need it;
Proposal
QP timing information should be bundled with channel number on which it is originally scheduled, so that a neighboring cell can decide whether to synchronize to it or not.
Cheng Shan, Samsung Electronics