1. Service Discovery Using JSON for 802.11aq
2019/4/9
Sep. 2014
Service Discovery Using JSON for aq
Date:
Authors:
Name
Affiliations
Address
Phone
Dapeng Liu
CMCC
Beijing, China
Dapeng Liu (CMCC)
Dapeng Liu (CMCC)

2. 2019/4/9
Sep. 2014
Abstract
This document discuss the JSON service indication of aq.
Dapeng Liu (CMCC)
Dapeng Liu (CMCC)

3. Sep. 2014
Background
802.11aq defines service discovery mechanism before association.
Draft 0.01 defines two stage process:
PAD capability advertisement
PADP request/response
802.11aq should provides enough scalability and flexibility for service discovery.
Dapeng Liu (CMCC)

4. Sep. 2014
Current Proposals
Dapeng Liu (CMCC)

5. Scalability and Flexibility of Service Discovery
Sep. 2014
Scalability and Flexibility of Service Discovery
Services that are available in a WLAN network may change frequently.
New type of services may be developed and deployed in WLAN network frequently.
Problem:
Using current service indication solution may require a long time to define a new service type and been adopted by both AP and terminal vendors.
It is not human readable, any new extensions depends on standards work; difficult for deployment.
Dapeng Liu (CMCC)

6. Sep. 2014
Proposed Solution
JSON (JavaScript Object Notation) is a lightweight data-interchange format
Easy for machine to parse and generate
 It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999
Easy to extend
Use JSON for service discovery?
Pros
Enough flexibility
Cons
overhead
Dapeng Liu (CMCC)

7. Proposed Solution JSON example { “service”:{ “type”: “printer”
Sep. 2014
Proposed Solution
JSON example {
“service”:{
“type”: “printer”
“type”: “voip” }
Dapeng Liu (CMCC)

8. Proposed Solution How to reduce the overhead
Sep. 2014
Proposed Solution
How to reduce the overhead
Service discovery works in a query/response fashion
Query of service only triggered by STA.
AP beacon only indicates support of 11aq.
STA knows whether 11aq is supported by current network from AP beacons.
STA send service query JSON to AP.
AP send service response to STA using JSON.
AP decide whether to proceed further steps for service detail query.
Dapeng Liu (CMCC)

9. Solution discussion Example of service discovery using JSON Sep. 2014
STA
11aq support indication AP
Service query
Service response (JSON)
Local service db
Local Service Database Configuration Interface
{ “service”:{“type”: “printer”, “type”: “voip”}}
Further Service Query (Optional)
Network Selection
Dapeng Liu (CMCC)

10. Proposed Change for Draft 0.01
Sep. 2014
Proposed Change for Draft 0.01
PADP
ULP ID
PAD request/response using a Service Identifier
PAD request/response using Service Identifier 1
Encapsulated ULP 2
PAD request/response using JSON 3
Reserved
4-220
Vendor Specific
221
Insert new PADP type in table 8-401
PAD request/response using JSON
ULPID: 3
Dapeng Liu (CMCC)

11. PADP Request/Response Using JSON
Sep. 2014
PADP Request/Response Using JSON
Token
JSON
Request PADP element format
Token
JSON
Response PADP element format
Dapeng Liu (CMCC)

12. Sep. 2014
Q&A
Dapeng Liu (CMCC)