doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 1 Use of BSSID in WAVE Date: Authors:

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 2 Abstract This submission addresses CID 163 and 164 from LB 110. A solution is described to permit simultaneous reception of BSS data frames and non-BSS data frames on the same channel by the same STA.

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 3 Desired Functionality WAVE mode permits transmission of data frames without an established WAVE BSS using a wildcard BSSID It may be desirable now or in the future to permit this in conjunction with data frames within an established WAVE BSS from the same STA –802.11p does not explicitly exclude this operation currently –Note: BSSID for a WAVE BSS is the MAC address of the WAVE BSS Initiator

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 4 The Problem There is no way to set the BSSID in a data frame to the wildcard BSSID while joined to a BSS The BSSID in transmitted data frames is the currently joined BSSID –BSSID is not currently specified on a frame-by-frame basis from higher layers –See IEEE Std , clause

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 5 Recommended Solution Add an optional parameter to MA-UNITDATA.request to specify a specific BSSID for the frame Add an optional parameter to MA- UNITDATA.indication to report a received BSSID other than the currently joined BSSID Add an optional BSSID parameter to MA- UNITDATA.confirm Use of the new parameters is not restricted to WAVE mode

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 6 Implications of the Solution Received BSS data frames are still subject to traditional filtering Received non-BSS data frames are filtered on the non- BSSID criteria –802.11p already contains the exception to allow reception of data frames with a wildcard BSSID Higher layers must know when to set a specific BSSID –In WAVE, non-BSS data frames are for WSMP only –WSMP can be enhanced to have knowledge of the new parameter

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 7 Rejected Solutions (1) Using a non-wildcard WAVE BSSID for non-BSS data frames is problematic –Assume two nearby WAVE BSSs with BSSID=3 and BSSID=4 –STAs on BSSID 3 will filter all data frames from BSSID 4 –Non-BSS data frames sent from a STA on BSSID 4 will also be filtered by STAs on BSSID 3 –Running in promiscuous mode would circumvent the primary purpose of multiple BSSIDs, which is to permit filtering of broadcast/multicast data frames See IEEE Std , p. 78 first sentence

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 8 Rejected Solutions (2) Resetting the MAC to change the BSSID is not feasible –Loss of MAC state and queued packets –Latency Creating a MLME-SET-BSSID.request to change the BSSID without resetting the MAC would require tight coupling and synchronization of management and data planes

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 9 Rejected Solutions (3) Set BSSID in the MAC Header to the wildcard BSSID when: –DA/RA is a locally administered multicast address with the non_bss_multicast_bit = 1 (non_bss_multicast_bit is an arbitrary value to be selected by the editor) –Broadcast MAC address (FF FF FF FF FF FF) qualifies as a locally administered multicast address with non_bss_multicast_bit = 1 Implications to filtering of WAVE BSS Data Frames –Unicast Data Frames: None Filtering is already based on the RA alone –Broadcast Data Frames: Filtering not supported Use a specific multicast address instead –Multicast Data Frames: Filtered if non_bss_multicast_bit = 0 –Case of non_bss_multicast_bit = 0 when not joined to a WAVE BSS is undefined Note that to/from DS data frames are sent unicast While this solution could work, after a long discussion in the November 2007 TGp sessions, the opinion of the group was that it is too clumsy

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 10 Rejected Solutions (4) Add new MA-UNITDATA-NON-BSS.request/confirm/indication primitives to support transmission of data frames outside of a BSS –Parameters same as for MA-UNITDATA.request/confirm/indication –BSSID in MAC Header always set to wildcard BSSID –Permits a non-wildcard BSSID to be used for data frames sent with current MA-UNITDATA.request On receive, MAC would invoke MA-UNITDATA-NON- BSS.indication if the BSSID is the wildcard BSSID Splitting MA-UNITDATA creates confusion in the architecture and is not supportable in the long-term if other parameters need to be added

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 11 Changes to IEEE p/D3.03 (1) Add a change to clause as follows: MA-UNITDATA.request ( source address, destination address, routing information, data, priority, service class, basic service set identification (optional) ) If supplied, the basic service set identification (BSSID) parameter specifies the BSSID for the outgoing frame as described in

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 12 Changes to IEEE p/D3.03 (2) Add a change to clause as follows: MA-UNITDATA.indication ( source address, destination address, routing information, data, reception status, priority, service class, basic service set identification (optional) ) The optional BSSID parameter is the basic service set identification as specified by the BSSID field of the incoming frame.

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 13 Changes to IEEE p/D3.03 (3) Add a change to clause as follows: MA-UNITDATA.confirm ( source address, destination address, transmission status, provided priority, provided service class, basic service set identification (optional) ) The BSSID parameter is the same as specified in the associated MA- UNITDATA.request primitive.

doc.: IEEE /2901r08 Submission March 2008 Doug Kavner, RaytheonSlide 14 Motion Move to adopt the recommended solution and instruct the editor to make the changes identified. Moved: Fan Bai Second: Daniel Jiang For: 14 Against: 1 Abstain: 13