Terminal Uplink Control Channel Resource Mapping for Enhanced Downlink
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Solution Overview
Problem
In wireless communications systems using HARQ, conventional schemes fail to efficiently specify physical uplink control channel resources when a base station transmits control information over an enhanced physical downlink control channel, limiting transmission efficiency.
Innovation Solution
A terminal and base station system that detects both physical and enhanced physical downlink control channels, allowing for the efficient mapping and transmission of response information to corresponding uplink control channel resources, with the terminal including units for detecting downlink control channels, extracting data, generating response information, and transmitting it over the appropriate uplink control channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information is transmitted over enhanced physical downlink control channel, then transmission efficiency is improved, but physical uplink control channel resource specification becomes difficult
Solution Approach 1:
The base station performs preliminary configuration of multiple physical uplink control channel resources and associates them with the enhanced physical downlink control channel resource in advance through higher-layer signaling. This preliminary setup enables the terminal to efficiently determine the corresponding uplink resource without complex real-time calculations, resolving the contradiction between improved transmission efficiency and ease of resource specification.
2Adaptability or versatility
If multiple physical uplink control channel resources are prescribed, then resource allocation flexibility is improved, but device complexity increases
Solution Approach 1:
Multiple physical uplink control channel resources are pre-configured and associated with the enhanced physical downlink control channel resource through higher-layer signaling before data transmission. This preliminary association simplifies the terminal's processing by providing a direct mapping relationship, reducing the complexity of determining uplink resources while maintaining allocation flexibility.
Solution Approach 2:
Higher-layer signaling acts as an intermediary that establishes the association between enhanced physical downlink control channel resources and multiple physical uplink control channel resources. This intermediary mechanism simplifies the terminal's decision-making process by providing pre-defined resource mappings, thereby reducing device complexity while maintaining flexibility.
Data Source
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AI summary
A terminal that communicates with a base station monitors a physical downlink control channel allocated in a physical downlink control channel region and an enhanced physical downlink control channel allocated in a physical downlink shared channel region different from the physical downlink control channel region. If the physical downlink control channel is detected, the terminal reports response information via a physical uplink control channel resource corresponding to the resource in which the physical downlink control channel was detected. If the enhanced physical downlink control channel is detected, the terminal reports via a prescribed physical uplink control channel resource.