1. IEEE P802.22 Wireless RANs Date: 2007-03-14
Month Year
doc.: IEEE yy/xxxxr0
March 2007
Beacon Frame Options
IEEE P Wireless RANs Date:
Authors:
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David Mazzarese, Samsung Electronics
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
March 2007
Abstract
The possible beacon frame sizes are presented according to different levels of security and error-correction coding, based on the current security proposal and rate ½ FEC proposal.
The impact of respective lengths of the beacon frame and the WRAN superframe is analyzed in terms of the latency before the WRAN can schedule a long quiet period without interrupting the superframe preamble.
David Mazzarese, Samsung Electronics
John Doe, Some Company

3. Frame structures without FEC
March 2007
Frame structures without FEC
Pros and cons
FEC on PSDU
(and CRC)
FEC on PSDU + Sign (and CRC)
FEC on PSDU + Sign + Certif (and CRC)
Beacons can authenticate
131 bytes
= ms
187 bytes
= ms
222 bytes
= ms
No channel Map
126 bytes
= ms
177 bytes
= ms
212 bytes
= 180 ms
Beacons can’t authenticate
98 bytes
= 85 ms
156 bytes
= ms
n/a
91 bytes
= 79.1 ms
142 bytes
= ms
No security
47 bytes
= 42.5 ms
40 bytes
= 36.7 ms 1
PSDU (except channel map)
(in the clear)
CRC#1
Channel Map
Signature
CRC#2
Certificate
CRC#3 18 2 5
49 ( ) 2 33 2
111 bytes (92.5 ms ms = 95 ms) 2
PSDU (except channel map)
(in the clear)
CRC#1
Signature
CRC#2
Certificate
CRC#3
106 bytes (88.3 ms ms = 90.8 ms) 18 2 49 2 33 2 3
PSDU (except channel map)
(in the clear)
CRC#1
Channel Map
Signature
CRC#2 18 2 5 2
78 bytes (65 ms ms = 67.5 ms)
49 ( ) 4
PSDU (except channel map)
(in the clear)
CRC#1
Signature
CRC#2
71 bytes (59.2 ms ms = 61.7 ms) 18 2 49 2 5
PSDU (except channel map)
(in the clear)
CRC#1
Channel Map
CRC#2
27 bytes (22.5 ms ms = 25 ms) 18 2 5 2
RTS/ANP Slot:
without FEC: 2.5 ms
with FEC: 3.3 ms 6
PSDU (except channel map)
(in the clear)
CRC#1
20 bytes (16.6 ms ms = 19.1 ms) 18 2
With FEC on PSDU only, no authentication at keep-out distance,
but the important information to protect incumbents can be recovered.
Quiet period length
David Mazzarese, Samsung Electronics

4. March 2007
Constraints on latency of quiet period scheduling according to the respective lengths of the beacon and of the superframe
As long as the quiet period length is smaller than one superframe length (158 ms without SCH), the WRAN does not need to interrupt the superframe preamble to schedule a quiet period, but it needs to wait until the desired part of the beacon frame does not interrupt the superframe preamble.
Minimum number of superframe to wait for before scheduling quiet period is S H
SCH
WRAN Superframe
SCH
WRAN Superframe
Beacon Frame
Beacon Frame
Beacon Frame D B
Quiet period P
David Mazzarese, Samsung Electronics

5. Mean and Maximum Latency
March 2007
Mean and Maximum Latency
Some cases from slide 5
Beacon frame
Quiet period
112.4 ms
159.2 ms
36.7 ms
Mean latency: 36 ms
Max latency: 160 ms
85 ms
Mean latency: 122 ms
Max latency: 320 ms
133.3 ms
Mean latency: 11 sec
Max latency: infinite
David Mazzarese, Samsung Electronics