SIP RE-INVITE Resource De-allocation for Paused IPTV Sessions
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Solution Overview
Problem
In IP Television (IPTV) systems, when a media stream is paused, the IMS and IP-CAN/RAN resources are not properly reconfigured, leading to excessive usage and unnecessary allocation, as the IMS network is not aware of the RTSP PAUSE request, resulting in resource inefficiencies and potential session termination.
Innovation Solution
A method where the user equipment (UE) sends a SIP RE-INVITE request with inactive SDP information to de-allocate IP-CAN/RAN and IMS media resources during a paused media stream, and re-allocate them upon resumption, using SIP signaling to manage resource configuration dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the media stream is paused using RTSP PAUSE request, then the media playback is stopped, but the IP-CAN/RAN and IMS resources remain allocated causing resource inefficiency
Solution Approach 1:
The system implements feedback by sending a SIP RE-INVITE request with inactive SDP information to the IMS network when a pause is detected, and sending another SIP RE-INVITE request to re-allocate resources when resumption is detected. This feedback mechanism ensures the IMS network is aware of the pause/resume state and can dynamically adjust resource allocation accordingly, preventing unnecessary resource consumption during paused states while maintaining session continuity.
2Quantity of substance
If the IMS network is not notified of the pause request, then the session remains stable, but resources are unnecessarily allocated
Solution Approach 1:
The system uses SIP RE-INVITE requests as an intermediary mechanism to communicate pause and resume states to the IMS network. This intermediary approach allows the UE to dynamically inform the network of resource allocation needs without directly terminating the session, thus reducing unnecessary resource allocation while maintaining session stability through proper signaling.
3Productivity
If SIP RE-INVITE requests are sent to dynamically reconfigure resources, then resource efficiency is improved, but signaling overhead increases
Solution Approach 1:
The system applies partial action by sending SIP RE-INVITE requests only when necessary (at pause and resume events) rather than continuously monitoring and signaling. This approach achieves resource efficiency by dynamically reconfiguring resources at critical transition points without the excessive signaling overhead that would result from continuous resource management signaling.
Data Source
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AI summary
A user equipment (UE), comprising at least one component configured to support controlling a media stream and modifying Internet Protocol-Connectivity Access Network (IP-CAN)/Radio Access Network (RAN) and Internet Packet (IP) Multimedia Subsystem (IMS) media resources, wherein the IP-CAN/RAN and IMS media resources are modified using a Session Initiation Protocol (SIP) RE-INVITE request to an IMS network, and wherein the media stream is controlled using a Real Time Streaming Protocol (RTSP) request to a media server. Also included is a UE comprising at least one component configured to support a method comprising sending a RTSP request to a signaling/control server in communications with a media server to control a media stream, wherein a SIP RE-INVITE request associated with the RTSP request is further sent from the UE or the signaling/control server to an IMS network to modify media resources associated with the media stream.