Feedback Condition Control for Group Call Resource Optimization
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Solution Overview
Problem
Existing mobile communications systems face challenges in preventing radio resource shortages and interruptions during group communication, especially in scenarios with varying radio states like a group of moving fire engines, where high-priority communications are critical.
Innovation Solution
A communications system with a base station and mobile station configuration that includes a priority setting unit and feedback condition control unit, which sets and manages feedback conditions based on call priority and user type, ensuring only necessary feedback is transmitted, thereby optimizing radio resource use and preventing interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all mobile stations transmit feedback information (CQI and Ack/Nack) using PUCCH, then the eNB can maintain reliable group communication by receiving feedback from all stations, but the number of required PUCCH resources increases proportionally with the number of mobile stations, leading to radio resource shortages
Solution Approach 1:
The patent segments the feedback transmission by introducing a feedback condition that divides mobile stations into two groups: those satisfying the feedback condition (transmit feedback) and those not satisfying it (interrupt feedback). This segmentation reduces the number of PUCCH resources required while maintaining communication reliability for critical scenarios.
Solution Approach 2:
The patent applies local quality by making feedback transmission behavior differ based on local conditions at each mobile station. Specifically, feedback is transmitted or interrupted based on whether the feedback condition is satisfied, allowing the system to adapt feedback behavior locally rather than uniformly across all stations.
2Quantity of substance
If feedback transmission is interrupted when radio state is higher than threshold value, then radio resources are conserved, but group communication may be interrupted when radio state varies greatly, especially for high-priority communications like emergency calls
Solution Approach 1:
The patent introduces dynamics by making the feedback condition adjustable based on communication priority. The feedback condition includes parameters such as CQI thresholds and Ack/Nack transmission rules that can be dynamically changed according to the priority level of the group communication, allowing the system to adapt to varying radio conditions and priority requirements.
Solution Approach 2:
The patent changes parameters by allowing the eNB to configure different feedback conditions based on communication priority. For high-priority communications, the feedback condition is set to ensure feedback transmission even when radio state varies, while for lower-priority communications, feedback may be interrupted to conserve resources. This parameter adjustment resolves the contradiction between resource conservation and communication reliability.
3Measurement precision
If the eNB processes feedback from all mobile stations, then accurate channel quality information is obtained for MCS determination, but the processing complexity and resource allocation overhead increase significantly
Solution Approach 1:
The patent extracts only the necessary feedback information by implementing a feedback condition that filters which mobile stations should transmit feedback. Instead of processing feedback from all stations, the eNB extracts feedback only from stations satisfying the feedback condition, reducing processing complexity while maintaining sufficient channel quality information for MCS determination.
Data Source
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AI summary
In order to be capable of preventing shortages in PUCCH wireless resources and disconnection of high-priority communications, a communications system 1 has: an eNB 20 having a feedback conditions control unit 22 that controls feedback conditions in accordance with call priority and a control unit 21 that controls communications with a mobile station 10 on the basis of feedback information that includes reception quality in the mobile station 10 and decoding results for a received call, said feedback conditions being for determining whether or not transmission of the feedback information is necessary; and the mobile station 10 having a priority setting unit 13 that sets a priority level for the mobile station itself, a reception quality measuring unit 11 that measures the reception quality of reference signals from the eNB 20, and a feedback requirement determination unit 12 that determines whether or not transmission of feedback information is required, on the basis of the feedback conditions.