1. TGaq Transaction Protocol
July 2013
doc.: IEEE /0788r1
January 2014
TGaq Transaction Protocol
Date:
Authors:
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

2. Transaction Protocol for TGaq
July 2013
doc.: IEEE /0788r1
January 2014
Abstract
Transaction Protocol for TGaq
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

3. July 2013
doc.: IEEE /0788r1
January 2014
Background
TGaq provides a mechanism for an unassociated STA to discover service information from a WLAN network
The service discovery information provides hints to the STA on services available on the infrastructure network.
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

4. July 2013
doc.: IEEE /0788r1
January 2014
Architecture
Service information and upper layer protocols (ULPs) are encapsulated within a Service Transaction Proxy
The Service Transaction Proxy is a logical component that resides in the infrastructure network and within the unassociated STA.
The Service Transaction Proxy advertises service information using Service Identifiers that defined as part of the ULP
E.g. Bonjour Name for the Bonjour protocol
E.g. urn for uPnP
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

5. January 2014 July 2013 doc.: IEEE 802.11-13/0788r1
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

6. Service Transaction Protocol Proxy
January 2014
Service Transaction Protocol Proxy
Access Network
STA AP
Service Transaction Proxy
Service Protocol Specific Communication
Service Transaction Proxy
P802.11aq Signaling
MAC
MAC
Michael Montemurro, BlackBerry

7. Example Service Transaction Proxy Table
January 2014
Example Service Transaction Proxy Table
Michael Montemurro, BlackBerry

8. Transaction Protocol STP is different from ANQP
July 2013
doc.: IEEE /0788r1
January 2014
Transaction Protocol
STP is different from ANQP
Not a request/response mechanism
Allows unsolicited push messages from the STA
Messages can carry information from non-AP STA to AP
ANQP is a network oriented protocol. STP is not for network discovery. Separate rules are needed.
STP contains service information that is broadcast in Beacon frames.
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

9. Protocol Elements The protocol is divided into two components:
July 2013
doc.: IEEE /0788r1
January 2014
Protocol Elements
The protocol is divided into two components:
Information on service types and upper layer protocols are transmitted using a new element in Beacon and Probe Response frames.
Service information is obtained using a Service Transaction Protocol request/response exchange.
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

10. Service Capabilities Element
January 2014
Service Capabilities Element
Service Capability Element
Michael Montemurro, BlackBerry

11. January 2014
Enumeration of ULP Ids
Michael Montemurro, BlackBerry

12. Example STP Request Frame
July 2013
doc.: IEEE /0788r1
January 2014
Example STP Request Frame
Figure 3: STP Request Frame
Figure 4: Query Request sub-field
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry

13. Example STP Response Frame
July 2013
doc.: IEEE /0788r1
January 2014
Example STP Response Frame
Figure 5: STP Response Frame
Figure 6: Service Descriptor (SD) sub-field
Michael Montemurro, BlackBerry
Stephen McCann, Blackberry