doc.: IEEE 802.22-06/0084-02-0000 Slide 1 Submission June 2006 Jianwei Zhang, Huawei MAC Management Message for Efficient Sensing With Supplements on Pages 17 – 22 (June 08) With Supplements on Pages 17 – 22 (June 08) IEEE P802.22 Wireless RANs Date: 2006-06-01 Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent Authors: N am e C om pany A ddress Phone em ail V incentK .N .Lau H K U ST H ong K ong,China 852-2358-7066 [email protected]RogerS. Cheng H K U ST H ong K ong,China 852-2358-7072 [email protected]RossD .M urch H K U ST H ong K ong,China 852-2358-7044 eermurch@ ee.ust.hk W aiH o M ow H K U ST H ong K ong,China 852-2358-7070 eewhm ow @ ee.ust.hk K haled Ben Letaief H K U ST H ong K ong,China 852-2358-7064 [email protected]Linjun Lu H uaw ei Technologies Shenzhen,C hina 0086-755-28973119 [email protected]Soo-Y oung Chang H uaw ei Technologies D avis,CA,U .S. 1-916 278 6568 [email protected]Jianw eiZhang H uaw ei Technologies Shanghai,China 86-21-68644808 zhangjianwei@ huawei.com Lai Q ian H uaw ei Technologies Shenzhen,C hina 86-755-28973118 [email protected]Jianhuan W en H uaw ei Technologies Shenzhen,C hina 86-755-28973121 wenjh@ huawei.com
Transcript
doc.: IEEE 802.22-06/0084-02-0000
Slide 1Submission
June 2006
Jianwei Zhang, Huawei
MAC Management Message for Efficient SensingWith Supplements on Pages 17 – 22 (June 08)With Supplements on Pages 17 – 22 (June 08)
IEEE P802.22 Wireless RANs Date: 2006-06-01
Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22.
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at [email protected].
Authors:Name Company Address Phone email
Vincent K. N. Lau HKUST Hong Kong, China 852-2358-7066 [email protected]
Roger S. Cheng HKUST Hong Kong, China 852-2358-7072 [email protected]
Ross D. Murch HKUST Hong Kong, China 852-2358-7044 [email protected]
Zhou Wu Huawei Technologies Shenzhen, China 86-755-28979499 [email protected]
Jun Rong Huawei Technologies Shenzhen, China 86-755-28979499 [email protected]
Jian Jiao Huawei Technologies Beijing, China 86-10-82882751 [email protected]
Mingwei Jie Huawei Technologies Shenzhen, China 86-755-28972660 [email protected]
doc.: IEEE 802.22-06/0084-02-0000
Slide 3Submission
June 2006
Jianwei Zhang, Huawei
MAC Management Messages MAC Management Messages for Efficient Sensingfor Efficient Sensing
doc.: IEEE 802.22-06/0084-02-0000
Slide 4Submission
June 2006
Jianwei Zhang, Huawei
OutlineOutlineMotivation:
• WRAN: limited resource for sensing
• More sensing resource (sensing period and number of sensing CPEs) should be allocated to “urgent” channels
• To facilitate this, BS needs to specify discontiguous channels for CPE to sense
Three parts:
I. The need to specify the discontiguous channels (Why “urgent”?) • What do we mean by “urgent”
• Why some channels are more “urgent” than the others
• Why those “urgent” channels can be discontiguous
II. The proposed changes to existing MAC messages (“Channel list”)
III. Simulation results
doc.: IEEE 802.22-06/0084-02-0000
Slide 5Submission
June 2006
Jianwei Zhang, Huawei
Why “urgent”? --- example 1Why “urgent”? --- example 1
• What are “urgent” channels?– “Urgent” channels are those that requires
considerably more resources to perform reliable sensing
– Some channels are more “urgent” than others since the density of CPEs is not uniform in the cell. Some region requires more resource to detect incumbents
– E.g.: Incumbent detection at proximity of CPE1 is more difficult due to low local CPE-density.
– Since Channel A is being used by CPE1 but CPE1 alone is not efficient enough to sense the Channel A reliably, it is more urgent than Channels B and C.
doc.: IEEE 802.22-06/0084-02-0000
Slide 6Submission
June 2006
Jianwei Zhang, Huawei
Why “urgent”? --- example 1Why “urgent”? --- example 1
• What if insufficient resource is allocated to sensing Channel A?
– Either the detection capability of incumbent presence is unsatisfactory, or
– System false alarm rate is too high
– E.g. One system false alarm leads to 10 minutes prohibited use of Channel A.
Pdec = 0.9, Pfalse = 0.1, Tdetect = 2sec
false alarm per minute
= (1-0.9^(60/2)) = 96%
a false alarm will trigger 10-minutes Non-Occupation Period.
Channel can hardly be used.
doc.: IEEE 802.22-06/0084-02-0000
Slide 7Submission
June 2006
Jianwei Zhang, Huawei
Why “urgent”? --- example 1Why “urgent”? --- example 1
• Solution:– Allocate more CPEs to spend
more periods sensing urgent channels. (e.g. assign CPE 2-4 to help CPE 1 to sense Ch A)
• Urgent channels change dynamically and generally will not appear contiguous.
• The BS needs to have efficient mechanism to specify discontiguous channels for CPEs to sense.
doc.: IEEE 802.22-06/0084-02-0000
Slide 8Submission
June 2006
Jianwei Zhang, Huawei
Why “urgent”? --- example 2Why “urgent”? --- example 2
• Channels 3, 4, and 5 are less “urgent”, probably due to
– TV signals present (database or site survey)
– Temporarily strong incumbent signal (e.g. TV station’s remote -news van)
• Difference between “channel aggregation”
– CPE shall not only sense the channels it is using, but need to sense channels used by some other (but may not be all) CPEs and channels not used by the cell.
doc.: IEEE 802.22-06/0084-02-0000
Slide 9Submission
June 2006
Jianwei Zhang, Huawei
• A flexible and efficient sensing scheme is needed for BS to specify discontiguous channels for the CPEs to sense.
• The current spec imposes a severe overhead punishment on the deployment of such schemes.
Starting Channel Number 8 bits The index of the starting channel
Number of Channels 8 bits The number of channels in the current interval
Linker 1 bit 1: The next 17 bits follow the interval-basis structure0: The Channel List structure is terminated here
}
Interleaved-based channel list*
* The Beacon Measurement Report and Consolidated Spectrum Occupancy Measurement Report should also be changed accordingly, please refer to our report for the details.
• We have proposed a flexible and efficient “channel list” structure to reduce the overhead for the BS to specifies discontiguous channels for CPEs to sense.
• Significant overhead savings have been shown through the numerical results.
doc.: IEEE 802.22-06/0084-02-0000
Slide 17Submission
June 2006
Jianwei Zhang, Huawei
• As per our proposal(a) an one-bit overheadone-bit overhead when only contiguousonly contiguous channels are sensed;
(b) save hundred of bitssave hundred of bits when discontiguousdiscontiguous channels are sensed.
• An Example Scenario of Discontiguous Channels[1] CPEs need to do in-band sensing;
[2] BS holds a backup channel list and it askes CPEs to sense these channels
[3] In order to avoid adjacent channel interference, the channels in the backup list should be as far away from the current channel as possible (this is mentioned in page 167 of Draft v0.1)
It is very possible that CPEs need to sense discontiguous channels
Supplement: Summary & ExampleSupplement: Summary & Example
– Periodic Transmit from CPE to BS, we shall study the average overhead per transmission.
• Beacon Measurement Request :
– May not need periodic transmission, event driven instead. When some incumbents appear in the
sensing channels, BLM_REQ is transmitted.
• Assumptions:– Suppose CPE can sense N channels (CPE Sensing Capability): one in-band sensing and (N-1) out-
band sensing channels selected from backup channels
– TV channels are randomly distributed
– Part 74 incumbents appear with a probability P in each channel
– The CPE report once 2 seconds
– The BS sends the BLM_REQ when any of the reported sensing channels is blocked
– Presence state of Part 74 incumbents in each channel slowly changes: the probability of an incumbent user detected in the channel which is clean in last report is P_chg.
