Control Channel Search Space Configuration for Low Latency
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Solution Overview
Problem
The increasing number of user equipment (UEs) and the demand for higher data transmission rates in wireless communication systems pose challenges in efficiently using limited radio resources, particularly in reducing latency and supporting new radio access technologies.
Innovation Solution
A method where a control channel (CCH) is transmitted and received within a search space that spans multiple time symbols, with the greatest number of CCH candidates located on the first time symbol, allowing for efficient downlink signal transmission and reception based on downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of CCH candidates is increased to support more UEs and higher data rates, then the system throughput and reliability improve, but the processing complexity and latency increase
Solution Approach 1:
The patent segments the search space into multiple time symbols, distributing CCH candidates across different time slots. This segmentation allows the system to support more UEs and increase throughput by providing more monitoring opportunities, while reducing per-slot processing complexity by spreading the detection load across multiple time symbols.
Solution Approach 2:
The patent performs preliminary actions by concentrating the greatest number of CCH candidates on the first time symbol. This allows UEs to have a higher probability of detecting control information early in the time interval, reducing latency and avoiding the need to monitor all time symbols equally, thus reducing overall processing complexity.
2Reliability
If control information is transmitted across multiple time symbols, then reliability and coverage are improved, but latency increases
Solution Approach 1:
The patent places the greatest number of CCH candidates on the first time symbol to perform preliminary action. This concentrates control information transmission early in the time interval, improving the probability of successful detection and reducing latency, while still maintaining reliability benefits of multi-symbol transmission for UEs that require it.
Solution Approach 2:
The patent applies local quality by differentiating the distribution of CCH candidates across time symbols. The first time symbol has the greatest number of candidates for low-latency detection, while subsequent symbols provide additional redundancy for reliability-critical transmissions, allowing the system to optimize for both latency and reliability in different local contexts.
3Productivity
If the search space spans multiple time symbols, then resource utilization efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the search space across multiple time symbols, improving resource utilization efficiency by distributing control channel candidates across available time resources. This increases the overall capacity to serve multiple UEs while allowing devices to monitor a structured pattern that reduces implementation complexity compared to exhaustive monitoring.
Data Source
AI summary
A control channel (CCH) is transmitted/received within a search space which is a group of CCH candidates. The CCH is transmitted/received in one of the CCH candidates. The search space spans N (N is a positive integer) time symbols among the multiple time symbols, and is configured to include a greatest number of CCH candidates in the first time symbols among the N time symbols.