SCC AS Session Setup with Pre-Selected Codec

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Solution Overview

Problem

Existing session establishment methods in IMS Centralized Services (ICS) networks delay radio bearer setup by selecting and amending codec messages, leading to inefficiencies in session setup.

Innovation Solution

A method where the Service Centralization and Continuity Application Server (SCC AS) receives a request to establish a session with a target device, including multiple codec identifiers, and indicates the use of a circuit-switched bearer, allowing for quicker session setup by selecting and instructing an intermediate node to establish the session without additional signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the SCC AS selects and amends codec messages to establish a session, then the session can be established with multiple codec options, but the radio bearer setup is delayed due to additional signaling and processing time

Engineering Contradiction:

Improvecodec selection capabilityVSAvoidsession setup time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The SCC AS pre-selects the highest priority codec from the available codec list before initiating the session establishment process. By performing the codec selection action in advance rather than during the signaling exchange, the system eliminates the time delay associated with codec negotiation while maintaining the capability to support multiple codecs through pre-established priority ordering.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the SCC AS uses additional signaling to select and indicate the chosen codec, then the session establishment can be completed with explicit codec confirmation, but the signaling overhead increases

Engineering Contradiction:

Improvecodec selection confirmationVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts the codec selection function from the signaling exchange process and performs it independently by the SCC AS before session establishment. Instead of including explicit codec selection signaling messages between network elements, the SCC AS unilaterally selects the highest priority codec and proceeds with session setup, thereby removing the redundant signaling overhead while maintaining reliable codec determination through the pre-established priority mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP2351309B1Session establishment in a communication network

Publication Date: 2017.03.08 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method and apparatus for establishing a communication session in an IMS Centralized Services communication network. A Service Centralization and Continuity Application Server (SCC AS) receives a request from an originating device to establish a session with a target device. The request includes a plurality of codec identifiers that could be used by the originating device. The SCC AS sends a second request to establish the session to the target device. The SCC AS subsequently receives, from an intermediate node between the SCC AS and the target device, an invite message. The invite message includes an indication that a codec identifier has been selected from the plurality of codec identifiers. The SCC AS then sends a message to the intermediate node instructing the intermediate node to establish the session.