Wireless Device Emergency PTT Call Preemption
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Solution Overview
Problem
Current wireless communication devices lack a mechanism to differentiate and prioritize emergency push-to-talk (PTT) calls from standard PTT calls, potentially leading to delayed or missed emergency communications.
Innovation Solution
Implementing a wireless communication device (WCD) with standard and emergency identifiers, allowing it to recognize emergency triggers and automatically originate or preempt standard PTT calls to prioritize emergency communications, using a PTT server for signaling and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a WCD uses a single identifier for all PTT calls, then the device complexity is reduced, but the ability to differentiate and prioritize emergency calls is lost
Solution Approach 1:
The identifier space is segmented into standard identifiers and emergency identifiers. Standard identifiers are used for regular PTT operations, while emergency identifiers are specifically allocated for emergency calls. This segmentation allows the system to differentiate between call types without requiring complete redesign of the identifier management system.
Solution Approach 2:
Different identifier types are assigned to different call contexts. The system applies standard identifiers for normal operations and emergency identifiers for emergency situations. This local differentiation enables prioritization and special handling of emergency calls while maintaining normal operations with standard identifiers.
2Reliability
If emergency PTT calls are given priority treatment, then emergency communication reliability is improved, but standard PTT call handling may be disrupted
Solution Approach 1:
The system performs preliminary actions by detecting emergency triggers before establishing emergency PTT calls. When an emergency trigger is detected, the system proactively initiates emergency call setup procedures, including resource reservation and priority queuing, ensuring that emergency calls are established quickly without waiting for standard call processing queues.
Solution Approach 2:
The network infrastructure acts as an intermediary that manages priority handling of emergency calls. The network can identify emergency calls based on emergency identifiers and apply priority scheduling, resource allocation, and routing without requiring changes to the standard PTT call processing logic. This intermediary approach allows emergency prioritization while maintaining standard call operations.
3Loss of time
If the WCD automatically preempts standard PTT calls upon receiving emergency calls, then emergency response time is reduced, but the user experience of ongoing standard calls is disrupted
Solution Approach 1:
The system uses distinct alert indications to differentiate emergency calls from standard calls. Emergency calls generate unique alert patterns (such as specific tones, visual indicators, or haptic feedback) that clearly signal the emergency nature of the call to the user. This clear differentiation helps users understand why standard calls are preempted and reduces confusion about the disruption.
Data Source
AI summary
A wireless communication device (WCD) that is configured to originate and receive push-to-talk (PTT) calls may be identified by a standard identifier in standard PTT calls and may be identified by an emergency identifier in emergency PTT calls. The WCD may be configured to recognize an emergency trigger and, in response to the emergency trigger, originate an outgoing emergency PTT call, using the emergency identifier. If, while engaged in a standard PTT call, the WCD receives an incoming emergency PTT call that includes the WCD's emergency identifier, the emergency PTT call may preempt the standard PTT call. For example, the WCD may convey audio from the emergency PTT call to a speaker or other audio output interface, instead of audio from the standard PTT call. The WCD may also release the standard PTT call.