Scheduling Request Carrier Selection in Multi-Cell LTE
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Solution Overview
Problem
In LTE systems, as the number of carriers increases, managing the transmission of control channels across multiple cells becomes complex, particularly when resources for scheduling requests (SR) are allocated to subframes with the same time point in multiple serving cells, requiring efficient methods to select the appropriate cell for SR transmission to avoid conflicts and optimize resource usage.
Innovation Solution
A method and apparatus for selecting a carrier for SR transmission by identifying conflicts with measurement gaps, HARQ feedback, CSI, SRS, and PUSCH retransmission resources across multiple serving cells, applying specific rules to determine the optimal cell for SR transmission based on resource availability and conflicts, ensuring efficient use of uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources for SR transmission are allocated to subframes with the same time point in multiple serving cells, then resource utilization is improved, but conflict management complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the time domain parameters of SR transmission resources. When a conflict is detected between SR transmission resources of different serving cells, the terminal adjusts the subframe timing parameter of the SR transmission in the second serving cell to a different time point, thereby resolving the resource conflict while maintaining efficient resource utilization across multiple cells.
2Reliability
If SR transmission resources are allocated in multiple serving cells, then transmission reliability is improved, but resource conflict probability increases
Solution Approach 1:
The patent implements preliminary action by detecting potential SR transmission resource conflicts before actual transmission occurs. The terminal identifies when SR resources in different serving cells are allocated to the same subframe and proactively adjusts the timing of one of the SR transmissions to avoid the conflict, preventing resource interference while maintaining the reliability benefits of multi-cell transmission.
3Measurement precision
If the terminal monitors all serving cells for SR resource allocation, then resource allocation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies the extraction principle by isolating and handling the conflict resolution requirement separately from general SR transmission processing. When a conflict is detected between SR resources in different serving cells, the terminal extracts the conflicting resource allocation and adjusts only the specific conflicting transmission timing, rather than re-evaluating all SR resources across all cells, thereby reducing power consumption while maintaining allocation accuracy.
Data Source
AI summary
Disclosed are a communication method for merging an IoT technique with a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure can be applied to intelligent services on the basis of a 5G communication technique and IoT-related techniques. The disclosed method relates to processing a resource allocation request of a terminal in a communication system, the method comprising the steps of: triggering a resource allocation request; confirming whether a resource for transmitting the resource allocation request has been allocated to a first subframe of at least two serving cells at the same time; and transmitting the resource allocation request to one serving cell of the at least two serving cells according to a predetermined condition when the resource is allocated to the first subframe of the at least two serving cells at the same time.