Terminal Uplink Control Channel Resource Mapping for R-PDCCH Response Signals
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Solution Overview
Problem
In 3GPP LTE systems, terminals face challenges in efficiently transmitting response signals when receiving downlink assignment control information via an R-PDCCH, leading to resource shortages and reduced uplink data quality due to punctured bits in PUSCH resources.
Innovation Solution
A terminal and base station configuration that allows for efficient transmission of response signals by selecting the appropriate uplink control channel resources based on whether downlink control information is received via a PDCCH or R-PDCCH, minimizing the overhead of PUCCH resources and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If downlink assignment control information is assigned in the R-PDCCH region to solve PDCCH resource shortage, then PDCCH resource availability is improved, but the method of transmitting response signals becomes unclear and resource allocation complexity increases
Solution Approach 1:
The patent introduces a mapping relationship as an intermediary between R-PDCCH resources and PUCCH resources. The base station maps R-PDCCH control channel elements to corresponding PUCCH resources, which then serve as the transmission path for response signals. This intermediary mapping mechanism resolves the ambiguity of response signal transmission while maintaining systematic resource management.
Solution Approach 2:
The base station performs preliminary mapping configuration between R-PDCCH and PUCCH resources before actual data transmission. This advance setup establishes clear resource allocation rules, eliminating the need for complex real-time decisions during operation and reducing overall system complexity.
2Reliability
If response signals are transmitted using PUCCH resources associated with R-CCE, then response signal transmission is enabled, but PUCCH resource overhead increases
Solution Approach 1:
The patent makes PUCCH resources serve multiple functions: they are used both for normal PDCCH-associated response signals and for R-PDCCH-associated response signals. By establishing a mapping relationship, the same PUCCH resource pool serves dual purposes, reducing the need for dedicated PUCCH resources for relay nodes and thereby reducing overall resource overhead.
3Reliability
If PUCCH resources are allocated for response signal transmission, then response signal capability is improved, but uplink data quality deteriorates due to punctured bits in PUSCH resources
Solution Approach 1:
The patent extracts the response signal transmission function from the PUSCH data channel and relocates it to the PUCCH control channel. By taking out the response signals from the data transmission path, the PUSCH resources are no longer punctured for control purposes, thereby preserving uplink data quality while maintaining response signal transmission capability.
Data Source
AI summary
Provided are a terminal, a base station and a signal transmission control method whereby a response signal can be efficiently transmitted when the terminal receives downstream allocation control information via an R-PDCCH. An extraction unit receives downstream control information via one of a first downstream control channel, which is transmitted by use of one or more control channel elements (CCE) associated with an upstream control channel resource, and a second downstream control channel different from the first downstream control channel, and also receives data via a data channel. A control unit selects, from resources associated with CCE and from particular resources reported by a base station, an upstream control channel resource to be used in transmission of the response signal, and controls the transmission of the response signal.