PUCCH Resource Allocation via Cyclic Shift Index
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Solution Overview
Problem
In future radio communication systems, such as LTE Rel. 15 and 5G, the existing methods for determining PUCCH frequency resources for frequency hopping within a certain bandwidth are inadequate, leading to inappropriate allocation of resources.
Innovation Solution
A user terminal and radio base station that determine PUCCH frequency resources using a cell-specific PRB offset based on the initial access BWP, rather than fixed values, and differentiate initial cyclic shift indexes based on the PUCCH format to ensure appropriate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed values are used for determining PUCCH frequency resources, then resource allocation is simplified, but frequency hopping resources cannot be appropriately determined
Solution Approach 1:
The patent changes the parameter used for determining PUCCH frequency resources from fixed values to cell-specific PRB offset values. This allows the frequency resources to be dynamically adjusted based on cell-specific configurations and frequency hopping patterns, resolving the contradiction between simplification and appropriateness by introducing flexible parameter variation.
Solution Approach 2:
The patent introduces dynamic determination of PUCCH frequency resources through cell-specific PRB offsets that vary according to frequency hopping. Instead of static fixed values, the system now adapts resource allocation based on hopping patterns and cell-specific configurations, achieving both flexibility and appropriateness in resource allocation.
2Device complexity
If initial cyclic shift indexes are not differentiated by PUCCH format, then processing is simplified, but resource allocation accuracy decreases
Solution Approach 1:
The patent applies different initial cyclic shift index determination methods for different PUCCH formats. Instead of using a uniform approach for all formats, the system tailors the cyclic shift indexing to specific format requirements, improving resource allocation accuracy for each format while maintaining overall system manageability through localized differentiation.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A user terminal includes: a receiving section that receives a downlink control channel; and a control section that determines an initial cyclic shift index for the uplink control channel based on the downlink control channel, in which a difference between different initial cyclic shift indexes based on different downlink control channels is different depending on a format of the uplink control channel.