PoC Server Media Type Negotiation for Session Establishment
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Solution Overview
Problem
Current PoC systems face limitations in establishing multimedia sessions due to differences in media types supported by participating clients, leading to increased session establishment times and restricted multimedia services when conventional session establishment methods are used.
Innovation Solution
A system and method for establishing and managing PoC sessions that support only media types supported by participating clients, involving a session establishment request client transmitting media type and attribute information to a PoC server, which stores and responds with transportable media types, allowing for dynamic updates during session participation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional PoC V 1.0 session establishment method is used in PoC V 2.0 system, then backward compatibility is maintained, but various multimedia services supported by PoC V 2.0 system are limited and session establishment time is long
Solution Approach 1:
The system performs preliminary actions by pre-defining media type priorities and preparing media type negotiation mechanisms before session establishment. The PoC server pre-arranges media type selection based on client capabilities, allowing for faster session establishment while supporting multiple multimedia services without requiring time-consuming real-time negotiations.
2Adaptability or versatility
If PoC clients support multiple media types, then multimedia service capability is enhanced, but media type compatibility issues arise when clients have different supported media types
Solution Approach 1:
The system changes the parameter of media type selection by establishing a priority-based selection mechanism. When clients support different media types, the system dynamically adjusts the media type parameter according to predefined priorities and client capabilities, ensuring reliable communication by selecting the most appropriate common media type rather than attempting to support all possible types simultaneously.
Solution Approach 2:
The PoC server acts as an intermediary that mediates between clients with different media type capabilities. It receives media type information from all clients, compares their supported types, and selects a compatible media type for the session, thereby resolving compatibility issues without requiring direct client-to-client negotiation.
3Adaptability or versatility
If all media types supported by clients are included in session, then media diversity is maximized, but session establishment complexity increases due to multiple media type negotiations
Solution Approach 1:
The system applies partial action by selecting only the necessary media types for session establishment rather than including all possible media types. It uses a priority-based approach to select a subset of media types that are most likely to be needed, simplifying the session establishment process while still providing sufficient media diversity for the intended service.
Data Source
AI summary
Provided are a system for establishing and managing a Push To Talk (PTT) over Cellular (PoC) session between PoC clients supporting various media types, a method thereof, and a User Equipment (UE) therefor. When a PoC client performing an Open Mobile Alliance (OMA) PoC multimedia call service supports a plurality of media types, and media types supported by PoC clients are not common, a PoC session can be established to support only media types set to be transmitted in a first response message after the session is established. In addition, a method of efficiently managing a session by updating the session when a newly supported media type is provided or when a recipient of an existing media type is changed is suggested.