PUCCH Resource Determination for ePDCCH in LTE-Advanced
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Solution Overview
Problem
The method of determining PUCCH resources when downlink data assignment is specified by an ePDCCH in LTE-Advanced systems has not been adequately addressed, leading to inefficiencies in resource utilization and potential data transmission issues.
Innovation Solution
A terminal apparatus and method that detect downlink control signals in both PDCCH and ePDCCH resource regions, switching between resource regions for uplink communication control channels based on the detected region to effectively transmit response signals for error detection, ensuring efficient PUCCH resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PUCCH resources are determined based on CCE index for PDCCH, then resource allocation is straightforward, but the method cannot be applied when ePDCCH is used for downlink data assignment
Solution Approach 1:
The patent changes the parameter basis for PUCCH resource determination from CCE index (used for PDCCH) to ePDCCH resource block index and orthogonal cover code index (used for ePDCCH). This parameter transformation enables the system to adapt to different downlink control channel types while maintaining a consistent resource determination framework.
2Reliability
If blind-determination is performed on multiple control information items, then the terminal can identify intended control information, but the processing time and complexity increase
Solution Approach 1:
The patent extracts the CRC check result as a separate decision criterion from the overall control information processing flow. By isolating the CRC verification step, the terminal can quickly identify valid control information items without performing complete processing on all received control information, thereby reducing overall processing time while maintaining identification accuracy.
3Productivity
If multiple component carriers are used for downlink communication, then data transmission capacity increases, but the number of response signals to be transmitted increases
Solution Approach 1:
The patent combines multiple response signals (ACK/NACK) for different component carriers into a single uplink transmission using resource multiplexing. By assigning different orthogonal cover codes or resource blocks to responses from different component carriers, the system merges multiple individual responses into one aggregated transmission, reducing the total number of separate signal transmissions while maintaining the ability to distinguish individual response contents.
Data Source
AI summary
A terminal device capable of providing a method for determining PUCCH resources used for notification of response signals indicating error detection results for downlink line data, when ARQ is applied during communications using an uplink unit band and a plurality of downlink unit bands associated to the uplink unit band and when downlink data allocations are instructed using an ePDCCH. In this device, a control unit (208) determines A/N resources on the basis of whether a channel used for transmitting downlink control information (DCI) is a PDCCH or an ePDCCH.