1. <March 2012>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [15.4j Coordinator Switching]
Date Submitted: [14 March 2012]
Source: [Ranjeet Kumar Patro1, Dave Evans2, Dong Wang3] Company [Samsung1, Philips Research2,3]
Address [(2) 101 Cambridge Science Park, Cambridge, CB4 0FY, UK]
Voice:[ ], FAX: [],
Re: [If this is a proposed revision, cite the original document.]
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Abstract: [A proposal for 15.4 PAN coordinator switching in a pre-emptive and orderly manner.]
Purpose: [For consideration by TG4j.]
Notice: This document has been prepared to assist the IEEE P 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P
Dave Evans, Philips

2. 15.4j Coordinator Switching
<March 2012>
15.4j Coordinator Switching
Dave Evans, Philips

3. doc.: IEEE 802.15-<doc#>
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Background
The PAN coordinator may need to be replaced and an orderly mechanism is needed to transfer the role of the PAN coordinator to other candidate coordinators in a pre-emptive manner
Dave Evans, Philips
<author>, <company>

4. doc.: IEEE 802.15-<doc#>
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Commands
The new coordinator is selected and confirmed by the existing coordinator before transition
Two new commands
Coordinator switch request
Coordinator switch response
Use channel switch notification command
Devices then join the new coordinator
Dave Evans, Philips
<author>, <company>

5. PAN Coordinator Selection
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PAN Coordinator Selection
Dave Evans, Philips
<author>, <company>

6. Coordinator switch request command
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Coordinator switch request command
Command frame identifier value: New value TDB
Number of devices: This field contains the value that indicates the number of devices associated with the PAN coordinator
This field is used by potential new coordinators to determine whether they have capacity to accept the devices that are associated with the PAN coordinator
Dave Evans, Philips
<author>, <company>

7. Coordinator switch request command, MHR
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Coordinator switch request command, MHR
The Destination Addressing Mode field shall be set to indicate short addressing, and the Source Addressing Mode shall be set to indicate extended addressing, when coordinator switch request command is broadcasted in the channel
The Destination PAN Identifier field shall contain the broadcast PAN identifier and the Destination Address field shall contain the broadcast short address, when coordinator switch request command is broadcasted in the channel.
The Source PAN Identifier field shall contain the value of macPANID of source PAN coordinator
The Source Address field shall contain the value of macExtendedAddress of source PAN coordinator
Dave Evans, Philips
<author>, <company>

8. Coordinator switch response command
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Coordinator switch response command 2
New PAN ID
Command frame identifier value: New value TBD
Switch Status: This field is used by a new potential PAN coordinator to indicate that is able to perform coordinator switching. A yes response indicates that the new potential PAN coordinator has sufficient capacity to accept the devices that are associated with the PAN coordinator.
New PAN ID: This field contains the PAN ID of the potential new coordinator
Dave Evans, Philips
<author>, <company>

9. Coordinator switch response command, MHR
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Coordinator switch response command, MHR
The Source Addressing Mode and Destination Addressing Mode field of frame control field shall be set to indicate extended addressing
The Destination PAN Identifier field shall contain the macPANID of the coordinator switch request command originated PAN
Destination Address field shall contain the extended address of the coordinator switch request command originated PAN
The Source PAN Identifier field shall contain the broadcast PAN ID
The Source Address field shall contain the value of macExtendedAddress of the new PAN coordinator
Dave Evans, Philips
<author>, <company>

10. doc.: IEEE 802.15-<doc#>
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Next
The next steps are the confirmation of the coordinator switch process
These steps use:
Firstly the coordinator switch request command to request for the switch to the new coordinator
Secondly the coordinator switch response command to respond to the coordinator switch request
Dave Evans, Philips
<author>, <company>

11. Coordinator Switching Confirmation
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Coordinator Switching Confirmation
PAN Coordinator next higher layer
PAN Coordinator MAC
Select channel
MLME-Coordinator-Switch.request
Coordinator switch request to new PAN coordinator
ACK
Channel switch notification
MLME-Coordinator-Switch.confirm
Coordinator switch response from new coordinator
Dave Evans, Philips
<author>, <company>

12. Coordinator switch request command
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Coordinator switch request command
This command is now unicast to the preferred new PAN coordinator
Number of devices: This field contains the value that indicates the number of devices associated with the PAN coordinator
Dave Evans, Philips
<author>, <company>

13. Coordinator switch request command, MHR
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Coordinator switch request command, MHR
The Destination Addressing Mode field and the Source Addressing Mode shall be set to extended addressing when coordinator switch request command is transmitted to a preferred new PAN coordinator
The Destination PAN Identifier field shall contain the macPANID of the new PAN coordinator and the Destination Address field shall contain the macExtendedAddress of the new PAN coordinator, when coordinator switch request command is transmitted to a new PAN coordinator
The Source PAN Identifier field shall contain the macPANID of the source PAN coordinator
The Source Address field shall contain the macExtendedAddress of the source PAN coordinator
Dave Evans, Philips
<author>, <company>

14. Coordinator switch response command
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doc.: IEEE <doc#>
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Coordinator switch response command 2
New PAN ID
Command frame identifier value: New value TBD
Switch Status: When the new PAN coordinator responds to the unicast coordinator switch request command, this field set to confirm the number of devices that the source coordinator wishes to switch otherwise it is set to zero
New PAN ID: This field contains the PAN ID of the potential new coordinator
Dave Evans, Philips
<author>, <company>

15. Coordinator switch response command, MHR
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Coordinator switch response command, MHR
The Source Addressing Mode and Destination Addressing Mode field of frame control field shall be set to indicate extended addressing
The Destination PAN Identifier field shall contain the identifier of the coordinator switch request command originated PAN
Destination Address field shall contain the extended address of the coordinator that sent coordinator switch request command
The Source PAN Identifier field shall contain the broadcast PAN ID
The Source Address field shall contain the value of macExtendedAddress of the new PAN coordinator
Dave Evans, Philips
<author>, <company>

16. doc.: IEEE 802.15-<doc#>
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Final step
Once the source PAN coordinator has received a successful confirmation of the coordinator switching request command and acknowledge this, it shall send a channel switch notification command to its PAN containing:
New channel number and new channel page
New PAN ID
New PAN coordinator extended address
On receipt of this command, the devices shall assume they have been disassociated and then associate with new PAN coordinator
Dave Evans, Philips
<author>, <company>