Group Communication Session Pre-establishment for SIP Call Setup
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Solution Overview
Problem
Existing communication systems face inefficiencies in group call setups over IP networks due to large SIP messages and high resource usage, particularly in Project 25 group calls, which result in delayed session establishment and wastage of RF resources.
Innovation Solution
A method and apparatus that establish a group identity for communication devices, allowing on-demand and early session setup members to join or leave sessions independently of call initiation, optimizing bandwidth and resource utilization by pre-establishing sessions in anticipation of calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If SIP protocol is used for call control in PoC networks, then wide acceptance and standardization are achieved, but message size increases and session establishment time is delayed
Solution Approach 1:
The patent applies preliminary action by pre-establishing sessions between group members before actual call initiation. The system maintains pre-established session information in memory, so when a call is initiated, the session can be quickly activated without going through the full SIP handshake process. This resolves the contradiction by performing the time-consuming session establishment in advance, when it does not impact call response time.
2Loss of time
If pre-session establishment mechanisms are implemented, then session setup delay is reduced, but RF resource wastage increases
Solution Approach 1:
The patent applies dynamics by making session establishment adaptive rather than static. The system dynamically determines whether to pre-establish sessions based on group characteristics, call patterns, and resource availability. Session pre-establishment is performed selectively for certain groups or conditions, allowing the system to optimize between setup time and resource usage rather than applying a one-size-fits-all approach.
Solution Approach 2:
The patent applies parameter changes by modifying session establishment parameters based on system state and group properties. The system changes parameters such as session timeout values, pre-establishment thresholds, and resource allocation levels to balance the trade-off between quick session setup and RF resource conservation. This allows flexible adjustment of the contradiction resolution based on operational conditions.
3Adaptability or versatility
If individual invitations are sent to each group member, then call setup flexibility is maintained, but signaling overhead and setup time increase
Solution Approach 1:
The patent applies merging by combining multiple individual invitation processes into a unified group-based session establishment mechanism. Instead of sending separate SIP INVITE messages to each group member, the system establishes a single group session that automatically includes all members. This reduces signaling overhead and setup time while maintaining the ability to control which groups receive pre-established sessions.
Data Source
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AI summary
A method for enabling group communications includes: establishing a group identity for a communication group comprising a first set of communication devices, and storing an identity for each of the communication devices in the first set; establishing a session to associate a second set of communication devices with the group identity, wherein the communication devices in the second set are different from the communication devices in the first set, wherein the session with the second set of communication devices is set up irrespective of a call being initiated for the communication group; detecting a first event associated with the initiation of a call for the communication group; and in response to detecting the first event, using the stored identities to join at least one of the communication devices in the first set to the session.