ETSI TR 143 903

ETSI TR 143 903 contains the result from the study of introduction of support for A-interface over IP. High level areas that are studied are e.g. potential placement of transcoders in the core network, effective bandwidth utilisation at the A-interface, impact on call related messages, payload formats.

The following items shall be covered in the study:

• In the target solution it is wanted to transfer compressed speech as far as possible end-to-end to achieveefficient transport and speech quality. The possibility to free GERAN from handling all kind of transcodersshall be studied, and the architecture might place Codecs in the core network.
• Impacts/changes on current A-interface procedures resulting from placing transcoders in the core network aswell as in the BSS shall be studied, e.g. impacts on the assignment and handover procedures.
• In addition to allow compressed speech over the A-interface the study shall provide further solution foreffective bandwidth utilisation at the A interface, which means it shall describe multiplexing of RTP flows andhow this will be negotiated between the BSS and CN nodes.
• The study shall describe a solution for “true end-to-end Codec negotiation”, which considers on a call basis thepreference/situation of the radio network.
• It shall be studied how call related messages have to be adapted, e.g. transfer of Codec related information,identification of calls/sessions.
• The study shall describe the wanted payload formats and other relevant user plane parameters likepacketization time etc.

Edition:

14.0.0

Published:

04/01/2017

Number of Pages:

64

File Size:

1 file , 560 KB

Note:

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