PoC Server RTCP Invitee Information Transfer
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Solution Overview
Problem
The PoC 1.0 standard does not support the transfer of group invitee information during ad-hoc group session establishment, leading to users being unable to determine whether to participate in a session without joining first, and the pre-established session and auto-answer mode simplify session setup but lack the ability to confirm invitee information.
Innovation Solution
A method and system for transferring invitee information using a pre-established session with an auto-answer mode, where the PoC server receives a session invitation message including invitee information and creates a Real-Time Control Protocol (RTCP) connection message to provide this information to the receiving-side PoC client, allowing users to accept or reject participation, and manage media stream transmission based on response modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the pre-established session and auto-answer mode are used to simplify session setup, then session establishment time is reduced, but the ability to transfer and confirm invitee information is lost
Solution Approach 1:
The patent segments the session establishment process into two distinct phases: (1) pre-established session setup for rapid connection, and (2) separate invitee information transfer phase. This allows the session to be established quickly while still providing the opportunity to transfer invitee information in a subsequent step, resolving the contradiction between speed and information completeness.
Solution Approach 2:
The patent implements preliminary action by pre-establishing the session connection before actual invitee information needs to be transferred. This allows the communication channel to be ready in advance, and when invitee information needs to be sent, the path is already established, thus maintaining both speed and information transfer capability.
2Ease of operation
If the PoC 1.0 standard is followed for ad-hoc group sessions, then session establishment is possible, but receiving-side clients cannot obtain invitee information without participating first
Solution Approach 1:
The patent introduces the PoC server as an intermediary that holds and manages invitee information. Instead of requiring clients to exchange information directly (which requires prior participation), the server acts as a mediator that can provide invitee information to receiving-side clients upon request, even before they formally participate in the session.
Solution Approach 2:
The patent implements preliminary action by having the PoC server pre-collect and store invitee information before the receiving-side client needs it. This allows the information to be readily available when the client requests it, eliminating the requirement for the client to join the session first to obtain the information.
3Loss of time
If SIP success message is transmitted directly to reduce setup time, then session setup time is reduced, but the ability to request invitee information confirmation is lost
Solution Approach 1:
The patent implements dynamics by making the session establishment process adaptable based on requirements. The system can operate in a fast mode where SIP success messages are sent immediately, or in a confirmation mode where invitee information is requested and confirmed. The PoC server dynamically selects the appropriate approach based on the specific situation and client capabilities.
Solution Approach 2:
The patent segments the session establishment into distinct optional steps: the essential SIP success message transmission for rapid setup, and an optional separate phase for invitee information confirmation. This segmentation allows the system to maintain fast setup capability while providing the flexibility to add confirmation steps when needed, without compromising the base speed.
Data Source
AI summary
Disclosed is a method for enabling a receiving-side Push-To-Talk (PTT)-over-Cellular (PoC) user to acquire ad-hoc group invitee information and selectively establishing a PoC session according to preference when a pre-established session and an auto-answer mode have been set between a receiving-side PoC user equipment and a PoC server in a PoC system. Particularly, in order to efficiently utilize the receiving-side Session Initiation Protocol (SIP) session setting, disclosed are a solution for transferring information related to other users expected to participate in group communication through user-plane signaling, and in addition, access rules, service setting, timers and a method for changing a response set between the client and server in order to support the solution.