1 / 8

TGaq Design Option for One-way Service Discovery Protocol

Proposal for adding One-way Service Discovery support to TGaq Design Options, including a Request/Response mechanism update to accommodate protocols like Multicast DNS, SSDP, and WS-Discovery. Implementation and potential issues are discussed.

rhumphries
Download Presentation

TGaq Design Option for One-way Service Discovery Protocol

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TGaq Design Option for One-way Service Discovery Protocol Date: 2013-04-22 Authors: RYU Cheol, ETRI

  2. 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

  3. 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 RYU Cheol, ETRI

  4. AP Connection W/O Association STA STA Associated Services UDP multicast GAS PAM UDP multicast Service advertisement STA M I B Wired Beacon Probe Probe response PAM: Pre-Association Message RYU Cheol, ETRI

  5. unassociated associated or wired AP STA Service Discovery Capable Device service advertisement multicasting a public action frame for service advertisement with information for the infrastructure association request RYU Cheol, ETRI

  6. Options for the public action frames AP sends the public action frames (PAM) • on an arbitrary channel or • on a common channel or • on a few social channels (eg. 1, 6, 11) or • on each channel while traversing. RYU Cheol, ETRI

  7. 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 file sharing Bye PAM(Bye) PAM: Pre-Association Message RYU Cheol, ETRI

  8. 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. • Broadcasting or multicasting • Which one is better for PAM, broadcasting or multicasting? • Multicasting would be with specific group address. RYU Cheol, ETRI

More Related