Concurrent PoC Session Management for Mobile Stations
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Solution Overview
Problem
Existing Push-to-talk over Cellular (PoC) communication systems require users to exit a current group session to join another, limiting concurrent group communication and inefficiently using network resources.
Innovation Solution
Facilitating concurrent PoC group communication sessions by maintaining multiple sessions simultaneously, allowing users to participate in multiple talk groups without terminating the first session, and using encryption to manage and decrypt data packets accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a user accepts an invitation to join another PoC group session while already in a current session, then the user can participate in multiple groups simultaneously, but the user must exit the current session to accept the new invitation
Solution Approach 1:
The patent segments the audio processing at the mobile station level by creating separate audio processing channels for different PoC sessions. Each session has its own audio stream processed independently, allowing the user to receive and process audio from multiple concurrent sessions without interference. This segmentation enables simultaneous participation in multiple groups without requiring session termination.
Solution Approach 2:
The patent introduces a new dimension of operation by allowing multiple PoC sessions to coexist in the background while the user interacts with one session at a time through the audio processing mechanism. The system maintains multiple sessions in parallel (dimensional expansion) while providing selective audio output through spatial or temporal separation dimensions.
2Reliability
If the network maintains separate PoC sessions for each user group, then each session can be managed independently, but network resources are wasted when users join multiple groups
Solution Approach 1:
The patent merges multiple PoC sessions into a single network session while maintaining logical separation at the mobile station. The network establishes one session per user group, but when a user joins multiple groups, the network consolidates these into a single session with multiple logical channels. This merging reduces redundant network resource allocation while maintaining independent session management through logical channel separation.
Solution Approach 2:
The single PoC session at the network level serves multiple functions by supporting multiple user groups simultaneously. The session infrastructure (signaling, media routing, security) is reused across different user groups, making the system more universal. This multi-functionality eliminates the need for separate dedicated sessions for each group, reducing network resource consumption while maintaining reliable session management.
3Reliability
If encrypted data packets are received without valid decryption keys, then security is maintained, but the data packets are discarded resulting in loss of communication
Solution Approach 1:
The patent introduces a key management intermediary that handles the distribution and validation of decryption keys for different PoC sessions. The key management system acts as a mediator between the network and mobile station, providing secure key delivery and validating key availability before packet decryption. This intermediary ensures that only properly authenticated packets are processed, maintaining security while preventing information loss through proper key management.
Data Source
AI summary
Methods and apparatus for facilitating concurrent Push-to-talk over Cellular (PoC) group communication sessions for a mobile station (102) are disclosed. A first PoC communication session (550) for a first user group (504) is maintained while a second PoC communication session (552) for a second user group (506) is concurrently maintained, where the second user group (506) has at least one common member (516) with the first user group (504). The second user group (506) may have at least one member (518, 520) which is not included in the first user group (504). Through a user interface, a PoC user may select between the first and the second user groups (504 and 506) for communication or combine the communications. In an alternative embodiment, all of the members (518, 520, 522) of a second user group (604) may be included in a first user group (602). In a specific approach, encrypted data packets of a PoC communication sub-session are communicated during a PoC communication session. If a key for the encrypted data packets is known for the mobile station (102), the encrypted data packets are decrypted to facilitate the PoC communication sub-session involving the mobile station (102); otherwise the encrypted data packets are discarded.