Downlink Control Channel Mapping Across Carrier-Sensing Periods
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Solution Overview
Problem
The transmission efficiency of downlink signals in unlicensed bands has not been comprehensively studied in existing 5G NR systems, leading to inefficiencies in PDCCH transmission and reception.
Innovation Solution
A method for mapping downlink control channel signals based on carrier sensing results, determining optimal periods for transmission and reception occasions, and adjusting resource allocation to improve efficiency in unlicensed frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink control channel signals are transmitted in unlicensed bands using conventional 5G NR methods, then basic communication functionality is maintained, but transmission efficiency is insufficient
Solution Approach 1:
The patent applies dynamics by making the PDCCH mapping flexible and adaptable to carrier sensing results. The mapping configuration is dynamically adjusted based on whether the channel is sensed as idle or busy, allowing the system to optimize transmission efficiency while maintaining reliability through adaptive resource allocation rather than fixed mappings
Solution Approach 2:
The patent changes the mapping parameters of PDCCH based on carrier sensing outcomes. When the channel is idle, one mapping configuration is used to maximize efficiency; when busy, a different mapping configuration is applied to ensure reliable reception. This parameter adaptation resolves the contradiction between efficiency and reliability
2Measurement precision
If blind decoding and channel estimation resources are increased to improve detection accuracy, then reception reliability improves, but terminal complexity and processing burden increase
Solution Approach 1:
The patent applies partial action by configuring blind decoding and channel estimation resources according to actual needs rather than always using maximum resources. The mapping is optimized to provide sufficient detection accuracy while avoiding excessive resource allocation that would increase terminal complexity
Solution Approach 2:
The patent adjusts the mapping parameters to optimize the balance between detection accuracy and processing complexity. By changing how PDCCH is mapped based on carrier sensing results, the system achieves reliable detection without requiring terminals to process excessive numbers of candidates or perform redundant channel estimations
3Productivity
If PDCCH mapping is optimized for transmission efficiency in unlicensed bands, then resource utilization improves, but compatibility with existing 5G NR specifications may be compromised
Solution Approach 1:
The patent uses dynamic mapping configurations that can adapt to unlicensed band requirements while maintaining compatibility with existing 5G NR specifications. The base station can select from multiple mapping patterns based on carrier sensing results, enabling optimized resource utilization without breaking specification compatibility
Solution Approach 2:
The patent creates a universal mapping mechanism that works both in licensed and unlicensed bands. The same PDCCH mapping framework is used, but with flexible configuration options that enable optimized resource utilization in unlicensed bands while maintaining compatibility with existing 5G NR specifications
Data Source
AI summary
This base station is provided with: a control circuit which determines a disposition method for a downlink control channel signal in at least one among a first period before a timing based on a carrier sense and a second period after the timing based on the carrier sense on the basis of information about at least one among the number of times a downlink control channel signal is blind-decoded and the number of resources for channel estimation; and a transmission circuit which transmits the downlink control channel signal on the basis of the determined disposition method.