TGaq Design Option for One-way Service Discovery Protocol April 2013 doc.: IEEE 802.11-13/0426 April 2013 TGaq Design Option for One-way Service Discovery Protocol Date: 2013-04-22 Authors: RYU Cheol, ETRI RYU Cheol. ETRI

for the TGaq Teleconference in April 2013 doc.: IEEE 802.11-13/0426 April 2013 Abstract Propose an idea of One-way Service Discovery support to be added to Design Options for the TGaq Teleconference in April 2013 RYU Cheol, ETRI RYU Cheol. ETRI

One-way Service Discovery Protocol support April 2013 doc.: IEEE 802.11-13/0426 April 2013 One-way Service Discovery Protocol support Request/Response mechanism cannot support multicasting messages in service discovery protocols such as: Multicast DNS for Bonjour SSDP(Simple Service Discovery Protocol) for UPnP WS-Discovery(Web Services Dynamic Discovery) for WSD Other unknown protocols which use multicasting UDP Notifying Pre-Association Messages(PAM) could tunnel those one-way messages Message Patterns of SOAP over UDP Unicast one-way Multicast one-way Unicast request, unicast response Multicast request, unicast response http://docs.oasis-open.org/ws-dd/discovery/1.1/wsdd-discovery-1.1-spec.html RYU Cheol, ETRI RYU Cheol. ETRI

AP STA STA GAS PAM STA April 2013 UDP multicast UDP multicast M I B Connection W/O Association STA STA Associated Services UDP multicast GAS PAM Service advertisement UDP multicast STA “Services” is like a Discovery Proxy of WS-Discovery. M I B Wired Beacon Probe Probe response PAM: Pre-Association Message RYU Cheol, ETRI

STA AP April 2013 unassociated associated or wired doc.: IEEE 802.11-13/0426 April 2013 unassociated associated or wired STA AP Service Discovery Capable Device service advertisement multicasting a public action frame for service advertisement with information for the infrastructure association request RYU Cheol, ETRI RYU Cheol. ETRI

Options for the public action frames April 2013 Options for the public action frames AP sends the public action frames (PAM) on an arbitrary channel or on a common channel or on each channels while traversing RYU Cheol, ETRI

An example: WS-Discovery on slide file sharing April 2013 doc.: IEEE 802.11-13/0426 April 2013 An example: WS-Discovery on slide file sharing Associated AP Hello: “My presentation file available” UDDI reference or local lookup with uuid PAM(Hello:”My presentation file available”) Joining to an infrastructure UDDI : Service registry of Web Services (OASIS standard) uuid: RendpointReference of WS-Discovery file sharing Bye PAM(Bye) PAM: Pre-Association Message RYU Cheol, ETRI RYU Cheol. ETRI

Issues A common channel April 2013 Issues A common channel A channel could be designated for service discovery? The public action frames for service advertisement How often does AP send them for service discovery? Just one time is feasible? Maybe not. Transparency 802.11aq service discovery is transparent to applications for both on clients and servers? Possibly if it supports multicasting service discovery types as well as request/response unicast mechanism. RYU Cheol, ETRI