9 Efficient use of radio resource

23.2213GPPArchitectural requirementsRelease 17TS

This clause captures the technical requirements to ensure efficient use of the radio resource in the UMTS access network. The radio resource is considered to be a scarce resource and therefore every opportunity shall be taken to optimize its use.

For UTRAN it shall be possible to re-apply PS domain pre-release 5 mechanisms for efficient use of radio resource.

Additional requirements for efficient use of the radio spectrum for release 5 SIP signalling include the following:

– UMTS shall support mechanisms to optimize transport of SIP signalling packets over the radio interface, typically by compressing the SIP signalling messages and by compressing the IP and transport layer protocol headers that carry these SIP messages.

– The chosen solution(s) shall be extensible to facilitate the incorporation of new and improved compression algorithms in a backward compatible way as they become available.

– The chosen solution(s) should work in roaming scenarios.

– Application specific compression shall minimize impacts on existing UMTS release e.g. it could be defined between the UE and associated application server, e.g. at the SIP Client and at the first SIP Proxy.

Support of SIP signalling compression is mandatory in the UE and P‑CSCF for IMS. The actual usage of compression is optional but highly preferable and is subject to operator policies. See TS 24.229 [23] for more details.

Annex A (informative):
Guidance for CSFB and IMS enabled UE implementations in E-UTRAN