Uplink Control Channel Resource Allocation in LTE Carrier Aggregation
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Solution Overview
Problem
In multiple-carrier LTE systems, uplink carrier resources are inefficiently used, leading to a lack of available resources for data transmission, which severely affects transmission efficiency.
Innovation Solution
A method and device for statically allocating uplink control channel resources, where the base station recognizes the configured feedback mode and transmission scheme of the terminal equipment, and allocates resources accordingly, reducing the overhead of the uplink feedback channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic scheduling ACK/NACK feedback transmission is used where UE calculates resource serial number according to CCE serial number, then each PDCCH corresponds to one available uplink control channel resource, but uplink carrier resources are inefficiently used leading to lack of available resources for data transmission
Solution Approach 1:
The patent segments the uplink control channel resources by introducing multiple PUCCH resource groups (first group and second group) that can be independently configured and activated. This segmentation allows the system to divide control channel resources into distinct pools, enabling more flexible allocation and reducing resource conflicts, thereby improving both feedback reliability and uplink data transmission efficiency.
Solution Approach 2:
The patent implements dynamic PUCCH resource allocation by allowing the network to dynamically indicate which PUCCH resource group should be used through downlink control information. This dynamic mechanism enables the system to adapt resource allocation to current traffic conditions, optimizing the balance between control channel reliability and data transmission efficiency based on real-time system state.
2Reliability
If uplink control signaling occupies both ends of frequency band and transmits through frequency hopping, then control channels are distributed across frequency spectrum, but resources in uplink subframe are reserved by system reducing available resources for other transmissions
Solution Approach 1:
The patent segments PUCCH resources into multiple groups that can be selectively activated, allowing the system to use only the necessary portion of uplink resources for control signaling at any given time. This reduces the overall reservation of uplink resources while maintaining control signaling reliability through the availability of multiple resource pools.
Solution Approach 2:
The patent creates a universal PUCCH resource framework where multiple resource groups can serve the same control feedback function but are activated based on system conditions. This multi-functionality allows the uplink resources to be dynamically shared between control signaling and data transmission needs, optimizing resource utilization.
Data Source
AI summary
A method and a device for determining uplink control channel resources are disclosed by the embodiments of the present invention. With the technical solutions of the embodiments of the present invention, the uplink control resources, such as the ACK/NACK and the like, can be configured semi-statically. The method is applicable for both the FDD system and the TDD system. The overhead of the uplink feedback channel in the Long Term Evolution (LTE) carrier aggregation system is reduced. Therefore the system performance of the LTE multi-carrier advanced system is improved, and the system is compatible with the LTE Release 8 system well.