Call Information Server for Group Call Confirmation
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Solution Overview
Problem
Conventional two-way radio systems lack effective methods to confirm whether a group call has reached all subscribers, as they cannot determine if subscribers are available or participating in other calls, leading to uncertainties in call delivery.
Innovation Solution
A call information server is introduced to track presence and availability information of subscriber units, providing real-time updates and confirming participation in group calls by accessing group list information, presence information, and availability information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional group call methods are used, then the system is simple and easy to operate, but the call delivery confirmation is unreliable and incomplete
Solution Approach 1:
A call information server is introduced as an intermediary component between the group call system and subscribers. This server collects presence information from a presence notification server and availability information from the infrastructure, then processes this data to determine call delivery status. The intermediary handles the complexity of information gathering and processing, providing reliable call confirmation without requiring changes to the core group call functionality.
Solution Approach 2:
The call confirmation function is segmented into distinct information types: presence information (whether subscribers are in the system), availability information (whether subscribers can accept calls), and call delivery confirmation (whether the group call reached subscribers). This segmentation allows each type of information to be collected and processed independently through appropriate channels, improving overall reliability while maintaining system clarity.
2Loss of information
If presence notification server is used to track SUs, then presence information is available, but it cannot determine if group call reaches particular subscriber
Solution Approach 1:
The solution merges presence information from the presence notification server with availability information from the infrastructure to create a comprehensive call delivery confirmation mechanism. By combining these two information sources, the system can determine not only whether subscribers are present in the system but also whether they are available to receive and participate in group calls, thereby achieving reliable call delivery confirmation.
Solution Approach 2:
The call information server implements a feedback mechanism by continuously monitoring both presence and availability information, then providing updated call delivery confirmation status to call initiators. This feedback loop ensures that call initiators receive accurate information about whether their group calls reached the intended subscribers, enabling informed decisions about call management and retry strategies.
Data Source
AI summary
A method in a call information server for a two-way radio system includes accessing, by the server, group list information associating the plurality of subscriber units with one or more groups; receiving, at the server, updates related to presence information, availability information, and the group list information; and confirming, by the server, for each particular subscriber unit indicated in a particular group list as forming a particular group, the particular subscriber unit's participation in a particular group call to the particular group, as a function of the presence information, the availability information, and the group list information. A call information server and a two-way radio system are also disclosed.