Uplink Control Channel Parameter Configuration for Frequency Hopping
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Solution Overview
Problem
In future radio communication systems, such as LTE Rel. 15 and 5G, user terminals face challenges in properly interpreting parameters for uplink control channel (PUCCH) resources, leading to potential transmission failures unless the parameters are correctly selected and configured.
Innovation Solution
A user terminal is equipped with a receiving section for frequency hopping information and a control section that applies spreading factors, demodulation reference code configurations, and base sequence settings to the uplink control channel based on this information, ensuring proper transmission by determining the appropriate parameters for PUCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is enabled for uplink control channel, then transmission reliability is improved through frequency diversity, but device complexity increases due to additional parameter configuration and interpretation requirements
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting spreading factors, demodulation reference signal configurations, and base sequence settings based on frequency hopping information. The control section modifies these parameters according to the frequency hopping pattern to maintain reliable transmission while adapting to changing frequency conditions, thereby resolving the contradiction between reliability improvement and device complexity.
2Reliability
If multiple PUCCH resources are configured with different parameters, then transmission robustness is improved for various scenarios, but ease of operation deteriorates due to difficulty in proper parameter interpretation
Solution Approach 1:
The patent implements feedback mechanisms where the receiving section obtains frequency hopping information and the control section uses this feedback to properly select and apply the appropriate PUCCH parameters. This feedback loop ensures that the user terminal can correctly interpret and apply parameters from multiple configured PUCCH resources, maintaining transmission robustness while improving ease of operation through systematic parameter selection based on received frequency hopping information.
Data Source
AI summary
In future radio communication systems, an uplink control channel will be transmitted properly. A user terminal has a receiving section that receives frequency hopping information, which indicates whether frequency hopping for an uplink control channel is enabled or not, and a control section that applies at least one of a spreading factor for a time-domain orthogonal cover code, a configuration of a demodulation reference code and a base sequence, to the uplink control channel, based on the frequency hopping information.