03 rn28203en20gla0 a over ip integration ppt

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A over IP Integration

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Feature ID(s):

1. BSS21341 - A over IP, Transcoder in BSS

2. BSS30380 - A over IP, Transcoder in MGW

Summary:

• There are two architecture options:

1. Transcoder function is located in the BSS - BSS21341

2. Transcoder function is located in the Core Network - BSS30380

• Note that the configuration of Legacy Abis and A over IP with Transcoder in the Media Gateway (MGW) is a Feature Candidate for the RG30 (BSS) Release (please see below for details).

Benefits for the Operator:

• The key benefit arises from the CAPEX / OPEX savings that can be derived through employing IP networking. The flexibility of the solution is also increased. Further, configuration is also simpler in Multipoint A type network scenarios.

• With Transcoder in the BSS, the existing transcoder capacity can be used along with the new IP-connectivity at the A-interface.

• With Transcoder in the Core Network, voice quality is enhanced since tandem coding is no longer necessary and latency is also improved. A reduced transcoding capacity is required in the BSS (realised in the Core Network).

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This feature provides A-interface U-plane and C-plane connections between BSS and CN over IP.

The A-interface U-plane is of three types:

• PCM over TDM (PT)

Transcoder is located in BSS. Legacy A-interface is used. There are circuit pools and circuit identification code (CIC) in A-interface.

•PCM over IP (PI)

Transcoder is located in BSS. In PCM over IP, either G.711 coding is used for speech, or clear mode (rfc4040 transparent 64 kbit/s connection) is used for CS data/fax and High Speed Circuit Switched Data (HSCSD) in A-interface. Compressed codecs with TFO are possible. Circuit pools and CIC in A-interface are not used here. Call identifier is used.

•Full IP (FI)

In this U-plane type, transcoder is located in MGW and compressed codecs are used in A-interface over IP with TrFO. There is no G.711 support. Full IP AoIP is only compatible with Packet Abis over TDM or Packet Abis over Ethernet. CS data/fax and HSCSD are not supported. Circuit pools and CIC in A-interface are not used here. Call identifier is used.

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ETP-A is the new hardware unit and ETPA and ETPC are the new functional units:

•ETPA :

•ETPA is a gateway for RTP packets between ETPE/T and BTS and MGW. ETPA performs bicasting, when it is required.

•ETPC :

•ETPC converts clearmode, PCMA, or PCMU RTP packets to/from PCM/TSL between ETPC and TR3x. It compensates packet delay variation (PDV) using jitter buffer

•Call related resources are reserved in ETP for each call.

•There is no AoIP support in TCSM2

•The RTP payload formats PCMA and PCMU for the coding scheme “audio” are supported in PCM over TDM and PCM over IP. The RTP payload formats for compressed codecs for CS “audio” are supported in Full IP

•In U-plane, RTP payload types are used for coding scheme “data and fax” as specified in rfc 4040 for clearmode

This feature supports multipoint A.

•Multipoint A can be handled in a more flexible way when the A-interface (both, U-plane and C-plane) is over IP.

•3GPP has defined new cause values concerning AoIP. The BSC holds statistics for these cause values.

•If AoIP is used with either full IP or TDMoIP A-interface types, a call identifier is defined to identify a call between BSC and MSS. Such a call identifier is not changed during intra-BSC handovers or internal handovers. A call identifier is defined by MSS per call.

•Using multipoint A there is the possibility for overlapping call identifiers in BSC. In multipoint

•A network configurations BSC takes care that possible same call identifiers from different MSSs do not get mixed up. BSC keeps record of all active call ids. A call identifier is a 32 bit number.

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PREREQUESITES

•New ETP-A hardware unit is required in TCSM3i or in BSC3i or in both according to the AoIP configuration.

•New software is required in BSC3i depending on the configuration.

•New software is required in ETPC unit in TCSM3i and in BSC3i. There exist differences in the software depending on the location of ETPC unit.

•New LAN-interfaces are required in BSC3i and also in ETPC unit of TCSM3i depending on the AoIP configuration.

•IP connections to the IP network has to be configured according to the site specific IP-configuration.

IP address configuration

UDP port allocation for RTP

•BSC3i, TCSM3i, MGW and MSS IP-endpoints have to be defined as a part of IPnetwork configuration for the AoIP.

•Before the calls can utilize A-interface over IP, AoIP-feature should be configured and activated in following entities, when the configuration with TC in TCSM3i is taken into use: MGW, MSS, BSC3i and TCSM3i is in use.

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PREREQUESITES

•New ETP-A hardware unit is required in TCSM3i or in BSC3i or in both according to the AoIP configuration.

•New software is required in BSC3i depending on the configuration.

•New software is required in ETPA unit, in TCSM3i and in BSC3i. There might exist differences in the software depending on the location of ETPA unit.

•New LAN-interfaces are required in BSC3i and also in ETPA unit of TCSM3i depending on the AoIP configuration.

•IP connections to the IP network has to be configured according to the site specific IP-configuration.

– IP address configuration

– UDP port allocation for RTP

•BSC3i, TCSM3i, MGW and MSS IP-endpoints have to be defined as a part of IP network configuration for AoIP.

•Before the calls can utilize the A-interface over IP, configuration with TC in MGW is taken into use, then the AoIP-feature is configured and activated in MGW, MSS and BSC3i. Also Packet Abis is activated in BSC3i and in BTS.

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03 rn28203en20gla0 a over ip integration ppt

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