Carrier Aggregation Resource Allocation via Subframe Feedback Extraction
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Solution Overview
Problem
Current mobile communication systems face resource shortages and inefficiencies in scheduling resources across multiple cells in carrier aggregation systems, particularly in managing duplex structures between cells, which affects system performance and user data rates.
Innovation Solution
A method and apparatus for resource allocation in a carrier aggregation system, where a base station configures cells for user equipment, identifies subframes associated with feedback information, and determines whether to allocate additional frequency resources based on downlink data transmission in other cells, ensuring efficient use of resources without impacting system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is transmitted in every subframe, then system performance is maintained, but resource utilization decreases
Solution Approach 1:
The patent extracts feedback information transmission from every subframe and selectively removes it only when unnecessary (when no DL data is transmitted in the corresponding Scell subframe). This extraction principle allows the system to maintain performance when needed while saving resources when not needed, directly resolving the contradiction between reliability and resource utilization.
Solution Approach 2:
Instead of transmitting feedback information in all subframes (excessive action), the patent applies partial action by transmitting feedback information only in subframes where it is actually needed (when DL data transmission occurs in the corresponding Scell subframe). This partial action approach maintains system performance while optimizing resource utilization.
2Productivity
If multiple cells are configured for carrier aggregation, then data rate increases, but scheduling complexity increases
Solution Approach 1:
The patent segments the feedback information transmission decision into separate components: one component handles Pcell scheduling independently, while another component handles Scell scheduling with conditional feedback transmission. This segmentation reduces the overall scheduling complexity by breaking down the multi-cell coordination problem into manageable independent decisions, while still achieving high data rates through carrier aggregation.
3Reliability
If frequency resources are allocated for feedback transmission, then system reliability is maintained, but available resources for data transmission decrease
Solution Approach 1:
The patent applies local quality by making the feedback transmission decision local to each subframe and each cell configuration. Instead of a uniform approach where feedback is always transmitted, the system locally adapts the feedback transmission based on the specific DL data transmission status in the corresponding Scell subframe. This local quality approach ensures reliability only where needed, freeing up frequency resources for data transmission elsewhere.
Data Source
AI summary
A method and apparatus for allocating resources in a base station (BS) in a carrier aggregation (CA) system is provided. The method and apparatus includes configuring a first cell and a second cell for a first user equipment (UE), identifying at least one second subframes of the first cell, the at least one second subframe being associated with feedback information to be received in a first subframe of the first cell, and at least one third subframes of the second cell, determining whether there is a downlink (DL) data transmission in the at least one third subframe of the second cell, and determining to allocate the other frequency resources, which are other than a frequency resource used for transmission of the feedback information in the first subframe, to a second UE, if there is no DL data transmission in the at least one third subframe of the second cell.