PUCCH Resource Allocation for Carrier Aggregation Feedback
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Solution Overview
Problem
The current LTE system faces challenges in reducing overheads when feeding back more than 20 ACK/NACK bits, particularly with carrier aggregation, as existing PUCCH formats like PUCCH format 3 are inefficient in supporting increased feedback information bits.
Innovation Solution
The proposed solution involves user equipment determining uplink subframes and channel resources based on subsets of downlink subframes, using p-codebook-size or q-codebook-size channel formats to efficiently send feedback information, where p and q are natural numbers, and p>q, allowing for flexible resource allocation to support more carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PUCCH format 3 is used for feedback, then the feedback mechanism is simple to implement, but it cannot efficiently support more than 20 ACK/NACK bits
Solution Approach 1:
The patent segments the feedback information transmission by dividing downlink subframes into two subsets (first subset and second subset). Each subset is associated with a different uplink channel resource (first uplink channel resource and second uplink channel resource respectively). This segmentation allows the system to handle different quantities of feedback bits by selecting appropriate channel resources and formats, thereby supporting carrier aggregation scenarios with more than 20 ACK/NACK bits while maintaining implementation simplicity.
2Adaptability or versatility
If more carriers are configured, then the system capacity increases, but the resource overhead increases
Solution Approach 1:
The patent implements dynamic adjustment of channel formats based on the number of downlink subframes and the specific carrier aggregation scenario. The system can dynamically select between different uplink channel resources and channel formats (p-codebook-size or q-codebook-size) to match the actual feedback information requirements. This dynamic approach allows the system to support more carriers and higher capacity while optimizing resource overhead by using the minimum necessary resources for each specific scenario.
3Adaptability or versatility
If a single uplink channel resource is used for all downlink subframes, then the channel configuration is simple, but it cannot efficiently handle different feedback scenarios
Solution Approach 1:
The patent applies local quality by assigning different uplink channel resources to different subsets of downlink subframes based on their specific requirements. The first subset of downlink subframes is associated with the first uplink channel resource, while the second subset is associated with the second uplink channel resource. Each channel resource can be configured with appropriate channel formats (p-codebook-size or q-codebook-size) tailored to the specific feedback scenario. This localized optimization provides high adaptability to different feedback scenarios while keeping the overall configuration manageable through clear subset-based organization.
Data Source
AI summary
Disclosed are a feedback information sending method and apparatus thereof. The method comprises: receiving downlink control information from an access network device; receiving a data channel scheduled by the downlink control information; determining an uplink time unit to send feedback information corresponding to the data channel; determining a first physical uplink control channel (PUCCH) resource for the feedback information according to resource indication information, wherein the first PUCCH resource is a part of a second PUCCH resource that is included in a second PUCCH resource set, and wherein the second PUCCH resource is indicated by the resource indication information, which raises resource utilization.