DMR Direct Mode Priority Frame Interruption Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The Digital Mobile Radio (DMR) protocol's direct mode does not effectively allow for the transmission and reception of high-priority services, such as urgent messages or calls, as it typically uses only one timeslot for communication, leaving no room for interrupting ongoing voice calls to prioritize higher authority messages.
Innovation Solution
A method and device that transmit a priority frame before a high-priority service frame, allowing the receiving party to identify and interrupt ongoing voice calls if the priority service has a higher authority level, enabling seamless switching to receive high-priority services in another timeslot without interrupting the existing voice call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio in transmitting state uses only one timeslot to realize a call, then the voice call transmission is stable, but the radio cannot receive high-priority services such as short message service or call service
Solution Approach 1:
The invention segments the communication timeslots into different functional slots: one timeslot is dedicated to voice call transmission while another timeslot is allocated for receiving high-priority services. This segmentation allows the radio to maintain stable voice transmission in one slot while being able to receive urgent messages or calls in another slot, thereby resolving the contradiction between transmission stability and service versatility.
2Loss of information
If channel inversion mode is used to allow receiving radio to send reversing burst signalling, then the receiving status can be notified, but the high-priority services cannot be received by the radio in transmitting state
Solution Approach 1:
The invention introduces a new dimension in the time domain by allocating a specific timeslot for high-priority service reception. Instead of using the existing channel inversion mechanism that operates within the same timeslot framework, the patent creates an additional temporal dimension where high-priority services can be received without interfering with the voice call transmission in other timeslots.
3Adaptability or versatility
If a priority frame is transmitted before a high-priority service frame, then the receiving party can identify and interrupt ongoing voice calls, but the system complexity increases
Solution Approach 1:
The invention applies preliminary action by transmitting a priority frame before the actual high-priority service frame. This priority frame contains indication information that allows the receiving party to identify incoming high-priority services in advance and prepare for interruption of ongoing voice calls. By performing this identification and decision-making process beforehand, the system enables quick switching without adding excessive complexity during the actual service delivery.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A high priority service sending method and device in a direct mode, and a high priority service receiving method and device in a direct mode. The receiving method includes: after sending a voice frame in a voice call sending state, a user terminal receiving and detecting a priority frame in another time slot with respect to the time slot occupied by the voice call; and if the priority frame is detected, then stopping the voice call and receiving a high priority service frame in the other time slot. Using the present invention can enable an interphone in a transmitting state in a direct mode to send or receive a high priority service as well.