Terminal Device PUCCH Resource Mapping for Enhanced Control Channels
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Solution Overview
Problem
In radio communication systems, specifying the physical uplink control channel resource between a base station and a terminal device is challenging, especially when the base station uses an enhanced physical downlink control channel, which impedes transmission efficiency, particularly in scenarios with a smaller cell radius.
Innovation Solution
A terminal device and base station configuration that includes units for detecting and generating physical uplink control channels by mapping response information to resources determined by indices and shift amounts specific to each terminal device, allowing efficient allocation of physical uplink control channel resources even when control information is transmitted through enhanced physical downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the base station uses the enhanced physical downlink control channel to transmit control information, then the number of terminal devices that can be accommodated increases, but the difficulty of specifying the physical uplink control channel resource increases
Solution Approach 1:
The patent introduces a new parameter (PUCCH resource indicator field in downlink control information) to explicitly indicate the physical uplink control channel resource. This parameter change allows the base station to flexibly allocate and specify PUCCH resources for each terminal device receiving control information via the enhanced physical downlink control channel, thereby resolving the resource specification difficulty while supporting increased terminal device capacity
Solution Approach 2:
The patent uses the downlink control information as an intermediary carrier to transmit the physical uplink control channel resource specification. The downlink control information contains a resource indicator field that serves as a mediator between the base station's resource allocation decision and the terminal device's uplink transmission, enabling efficient resource specification without direct complex signaling
2Productivity
If the physical uplink control channel resource is transmitted to the base station having a smaller cell radius, then the transmission efficiency is improved, but the resource specification becomes more difficult
Solution Approach 1:
The patent modifies the resource specification approach by introducing explicit resource indicators in downlink control information, allowing precise PUCCH resource allocation that is independent of cell radius. This parameter-based specification method enables efficient resource transmission to base stations with smaller cell radii while maintaining ease of resource identification and allocation
Data Source
AI summary
The present invention provides a base station, a terminal device, a communication system, and a communication method configured to efficiently specify a physical uplink control channel resource in a case that the base station notifies the terminal device of control information through an enhanced physical downlink control channel or in a case that a cell radius is small. The terminal device in communication with the base station monitors a physical downlink control channel placed in a common search space and an enhanced physical downlink control channel placed in a terminal-specific search space. Upon detecting the enhanced physical downlink control channel, the terminal device maps response information to a physical uplink control channel resource determined in response to at least an index of an element forming the detected enhanced physical downlink control channel and an individual shift amount individually configured on a per terminal device basis, and then reports the base station of the mapped response information.