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May 200 6 STMicroelectronics Slide 1 doc.: IEEE 802.22-06/0072r0 Submission Scheduling for Connection Based Over-the-air Inter Base Station Communications IEEE P802.22 Wireless RANs Date: 2006-5-12 Authors: 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 Name Company Address Phone email Wendong Hu STMicroelectronics USA +1-408-467- 8410 [email protected] Liwen Chu STMicroelectronics USA +1-408-467- 8436 [email protected] George Vlantis STMicroelectronics USA +1-408-451- 8109 george.vlantis@st. com Kyeongsoo Kim STMicroelectronics USA +1-408-451- 8137 [email protected] om
Transcript
Page 1: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 1

doc.: IEEE 802.22-06/0072r0

Submission

Scheduling for Connection Based Over-the-air Inter Base Station Communications

IEEE P802.22 Wireless RANs Date: 2006-5-12Authors:

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].

Name Company Address Phone email

Wendong Hu STMicroelectronics USA +1-408-467-8410 [email protected]

Liwen Chu STMicroelectronics USA +1-408-467-8436 [email protected]

George Vlantis STMicroelectronics USA +1-408-451-8109 [email protected]

Kyeongsoo Kim STMicroelectronics USA +1-408-451-8137 [email protected]

Page 2: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 2

doc.: IEEE 802.22-06/0072r0

Submission

Connection Based Communications

• Connection identifier (CID) specified as a key component

• Define a mapping between transmission-reception processes for deterministic communication scheduling

• Defines a service flow for QoS provisioning and communication prioritization

Page 3: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 3

doc.: IEEE 802.22-06/0072r0

Submission

Logical Control Connections (LCC)

• Connection based inter-system communications– Reliable, efficient

• Enable the feasibility and overall efficiency of the collaborative coexistence mechanism

• Established and maintained both over the air and over the backhaul

• Very low communications overhead – Spectrum bandwidth, Messaging latency,

Hardware/software complexities

Page 4: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 4

doc.: IEEE 802.22-06/0072r0

Submission

Coexistence Communications Control

ServiceBS

BridgeCPE

CoexistBS

(1) Data TX Scheduling (3) Coexist TX Scheduling

(Ignored by Bridge CPE)

(4) Coexist OperationScheduling (5) Coexist TX Requests

(6) Coexist TX Scheduling

(7) Coexist Transmissions

(10) Coexist TX Scheduling

(Ignored by Bridge CPE)

(8) Data TX Scheduling

Scheduled Coexist Operation Period

Service Connections Coexist Connections

(2) Data Transmissions

(9) Data Transmissions

S-BS controls the coexistence communications between B-CPE and C-BS

Page 5: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 5

doc.: IEEE 802.22-06/0072r0

Submission

Basic Scenarios and Assumptions

• Two basic scenarios– Two/Multiple WRANs sharing a single channel

– Two/multiple WRANs sharing two/multiple channels

• Basic assumptions– WRANs synchronize MAC frames by sharing a

common clock provided by GPS or other means.

– Coexistence Time Slots (CTS) available as in 802.16h

Page 6: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 6

doc.: IEEE 802.22-06/0072r0

Submission

Communications between Two WRANs on a Single Channel: Scenario I

S-BS C-BS

B-CPE

CPE1CPE2

Channel A

Page 7: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 7

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Announcement and Detection

S-BS C-BS

B-CPE

CPE1CPE2

Channel A

• C-BS announces its existence through Coexistence Time Slot (CTS).

• B-CPE captures C-BS’s announcements and reports to S-BS.

• S-BS instructs B-CPE to notify S-BS’s existence to C-BS through CTS.

CTSB-CPE CTS

CTSC-BS CTS

Page 8: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 8

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Initial Coexistence Resolution

• C-BS sends coexistence (e.g. spectrum contention) requests to S-BS (via B-CPE) through CTS.

• S-BS responds to C-BS’s requests via B-CPE through CTS.• If C-BS fails to acquire the channel (e.g. loses the spectrum

contention on channel A), go back to step 1 to repeat the coexistence resolution process.

• Else if C-BS acquires the channel (e.g. wins the spectrum contention on channel A)

– S-BS instructs B-CPE to setup Coexistence Connections with C-BS after the channel is released.

– S-BS instructs B-CPE to request “Reserved Time Slots” (RTS) for B-CPE to S-BS communications on the channel after the channel is release.

– S-BS provides B-CPE parameters (e.g. spectrum contention numbers) and strategies for coexistence with C-BS.

– S-BS releases the channel at the time both S-BS and C-BS agree upon.

Page 9: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 9

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Coexistence Connection Establishment and Maintenance

• B-CPE, as instructed by S-BS, sets up coexistence connections with C-BS.

• B-CPE requests for “Reserved Time Slots” (RTS) for B-CPE to S-BS communications in the channel.

S-BS C-BS

B-CPE

CPE1CPE2

Channel A

C-BS has acquired Channel A from S-BS

Page 10: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 10

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Inter-BS Communications (C-BS occupies the channel)

MAPC-BS

DL

MAP

UL

B-CPE

DL UL

RTS Req.RTS Grant

DL UL DL UL

S-BS

DL RTSMonitoring

MAP

DL UL

DL UL

Time

Reserved Time Slots (RTS)B-CPE to C-BS Comm.

Page 11: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 11

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Inter-BS Communications (C-BS occupies the channel)

• Periodic RTS monitoring (S-BS)• B-CPE to C-BS communications• Coexistence bandwidth allocation (C-BS)

– RTS (Reserved Time Slots)

• Feedback of coexistence bandwidth allocation (B-CPE)

• B-CPE to S-BS communications• B-CPE to C-BS communications

Page 12: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 12

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I - Coexistence Resolution

S-BS C-BS

B-CPE

CPE1CPE2

Channel A

S-BS has acquired Channel A from C-BS

Page 13: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 13

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Inter-BS Communications (S-BS occupies the channel)

C-BS

DL UL DL UL DL UL

B-CPE

MAPS-BS MAP MAP

DL UL DL UL DL UL

RTS Monitoring

RTS Grant

MAP

DL UL

RTS Req.

DL UL

RTS Monitoring

Time

B-CPE to C-BS Comm.

B-CPE to S-BS Comm.

Reserved Time Slots (S-BS)

Reserved Time Slots (C-BS)

Page 14: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 14

doc.: IEEE 802.22-06/0072r0

Submission

Scenario I – Inter-BS Communications (S-BS occupies the channel)

• Periodic RTS monitoring (C-BS)• B-CPE to S-BS communications• Coexistence bandwidth allocation (S-BS)

– RTS (Reserved Time Slots)

• Feedback of coexistence bandwidth allocation (B-CPE)

• B-CPE to C-BS communications• B-CPE to S-BS communications

Page 15: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 15

doc.: IEEE 802.22-06/0072r0

Submission

Communications between Two WRANs on Two Channel (Scenario II)

S-BS C-BS

B-CPE

CPE1

CPE2

Channel A Channel B

Page 16: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 16

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II – Announcement and Detection

S-BS C-BS

B-CPE

CPE1

CPE2

Channel A Channel B

• S-BS and C-BS announce their existence in Coexistence Time Slot (CTS). – Such announcements can be

done by base stations themselves or via bridge CPEs, such as B-CPE and CPE1.

• S-BS and C-BS capture the existences and channel usages of each other. – In the example scenario, S-BS

detects C-BS is using channel B and C-BS detects S-BS is using channel A.

CTSB-CPE CTS

CTSC-BS CTS

CTSS-BS CTS

CTSCPE1 CTS

Page 17: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 17

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II - Coexistence Connection Establishment and Maintenance

S-BS C-BS

B-CPE

CPE1

CPE2

Channel A Channel B

• S-BS instructs B-CPE to establish and maintain coexistence connections with C-BS in channel B.

• Similarly, C-BS could instruct CPE1 to establish and maintain coexistence connections with S-BS in channel A.

Page 18: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 18

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II - Inter Base Station Communications

MAP MAP MAP MAPC-BS

DL UL DL UL DL UL

MAP MAP MAP MAPS-BS

DL UL DL UL DL UL

DLUL

B-CPE

DLUL UL

UL

B-CPE C-BS Communications

B-CPE S-BS Communications

Polling Slots Polling Slots

Polling Slot

Operations on Channel A

Operations on Channel B Coexistence Messages

Page 19: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 19

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II - Inter Base Station Communications

• Periodic Coexistence Polling Slots (CPS)– After coexistence connections has been established

with B-CPE, C-BS periodically schedules Coexistence Polling Slots for asynchronized B-CPE to C-BS communications.

– S-BS also schedules periodic CPS to reestablish communications with B-CPE after coexistence communications between B-CPE and C-BS has completed.

– CPS could be used for coexistence message transmissions

Page 20: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 20

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II - Inter Base Station Communications

• B-CPE to C-BS Communications– S-BS schedules B-CPE to communicate with C-BS through the

coexistence connections for a Coexistence Operation Period (e.g. 2-frame duration)

• B-CPE switches to channel B and decodes the MAP of C-BS;• B-CPE sends BW requests (could be w/ coexist messages) via the

scheduled CPS;• C-BS grants BW to B-CPE for communicating with B-CPE.• C-BS and B-CPE communicate with each other using the allocated

BW.

– During B-CPE to C-BS communication period, C-BS does not schedule CPS for B-CPE.

– C-BS resumes CPS scheduling for B-CPE after the communications with B-CPE is completed.

Page 21: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 21

doc.: IEEE 802.22-06/0072r0

Submission

Scenario II - Inter Base Station Communications

• B-CPE to S-BS Communications– After the Coexistence Operation Period, S-BS periodically

schedules Coexistence Polling Slots for asynchronizaed B-CPE to S-BS communications, until B-CPE to S-BS communications are reestablished.

– After B-CPE to C-BS communications, B-CPE switches back to channel A, and decodes the MAP of S-BS, in search of CPS of the S-BS.

– B-CPE sends BW requests (could be w/ coexist messages) to S-BS via the scheduled CPS.

– S-BS grants BW to B-CPE for communicating with B-CPE.– C-BS and B-CPE communicate with each other using the allocated

BW.

Page 22: Doc.: IEEE 802.22-06/0072r0 Submission May 2006 STMicroelectronics Slide 1 Scheduling for Connection Based Over-the- air Inter Base Station Communications.

May 2006

STMicroelectronics Slide 22

doc.: IEEE 802.22-06/0072r0

Submission

CBP and LCC for Over-the-air Inter-BS Communications

• CBP: Coexistence Beaconing Protocol– Contention based over-the-air communications– Simple, Good for communications tolerable to low reliability and

efficiency

• LCC: Logical Control Connections– Connection based over-the-air communications– Scheduling overheads, Good for communications required high

reliability and efficiency

• CBP and LCC can coexist targeting different situations.– Can share the same/common packet structure


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