Optimising SIP for narrow band signalling channels
نویسندگان
چکیده
This paper explores the problem of signalling efficiency of the Session Initiation Protocol in a cellular network. We present performance metrics on SIP and compare SIP signalling efficiency with ISDN Q.931. We present recent measurement results on SIP and SigComp performance and conclude that optimisation of SIP beyond SigComp is necessary for cellular access. We suggest an optimisation process starting in the ASCII domain and proceeding to a Type-Length-Value representation for SIP. The process combines protocol simplifications and encoding. As an alternative, we present an estimation of the efficiency of using zipping for compressing SIP/SDP messages. The paper estimates the signalling efficiency of the different optimisation steps in the ASCII and the binary domains in a narrow band context demonstrating at best a compression ratio of better than 10 to 1 compared to SIP as specified for 3G release 5 using the TLV coding style. Additionally, we estimate that the same level of compression may be reachable with a zipping approach we outline. Finally, we present a new architecture for SIP and SDP adding a new Type-Length-Value representation and the other optimisations for the protocol for narrow band access such as cellular networks.
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