Terminal Device PUCCH Resource Allocation for Uplink Response Signals
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Solution Overview
Problem
In 3GPP LTE-Advanced systems, the determination of PUCCH resources for indicating error detection results of downlink data is constrained by ePDCCH, leading to scheduling limitations for future downlink subframes, especially when ePDCCH-PUCCH resources overlap with PDCCH-PUCCH resources, causing inefficiencies in resource allocation and potential interference.
Innovation Solution
A terminal apparatus and method that arranges response signals on predetermined PUCCH resources within the ePDCCH resource region, dividing it into subframes and indexing them in ascending order, allowing flexible selection of PUCCH resources for each downlink communication subframe without imposing constraints on future scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH resources are determined based on ePDCCH-PUCCH resource association, then response signal transmission is enabled, but scheduling flexibility for future downlink subframes is constrained
Solution Approach 1:
The PUCCH resource region is divided into multiple partial regions, with each partial region associated with a specific downlink subframe. This segmentation allows the terminal to determine PUCCH resources based on the specific downlink subframe, enabling response signal transmission while maintaining scheduling flexibility for future subframes.
Solution Approach 2:
The association between PUCCH resources and downlink subframes is made dynamic through the use of multiple partial regions. The terminal can flexibly select appropriate PUCCH resources from different partial regions based on the timing and scheduling requirements of each downlink subframe, thus maintaining adaptability while ensuring reliable response signal transmission.
2Device complexity
If ePDCCH-PUCCH resources overlap with PDCCH-PUCCH resources, then resource allocation is simplified, but interference increases and resource allocation efficiency decreases
Solution Approach 1:
The PUCCH resource region is segmented into multiple partial regions that are separately associated with different downlink subframes. This segmentation allows for differentiated resource allocation between ePDCCH and PDCCH, reducing overlap and interference while maintaining manageable allocation complexity through structured organization.
Solution Approach 2:
Different partial regions of the PUCCH resource region are optimized for different purposes and associated with specific downlink subframes. This local quality approach allows regions to be allocated based on specific requirements, reducing interference through spatial separation while maintaining overall allocation efficiency through the structured partial region framework.
Data Source
AI summary
When downlink data allocation is indicated in an ePDCCH, this terminal device can determine PUCCH resources to be used in notification of response signals indicating results of error detection of downlink data without imposing scheduling restrictions on future DL subframes. In this device, an extraction unit receives downlink data on multiple unit bands. A CRC unit detects errors in the downlink data. A response signal generation unit generates a response signal by using the results of error detection of the downlink data obtained by the CRC unit. The control unit arranges the response signal in the PUCCH resources corresponding to the current DL subframe.