Terminal Channel Occupancy Detection for Uplink Resource Allocation
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, there is a challenge in efficiently allocating uplink resources due to the lack of accurate channel status assessment before scheduling, leading to resource wastage and potential interference from adjacent nodes in unlicensed bands.
Innovation Solution
The implementation of a Listen Before Scheduling (LBS) method, where terminals detect channel occupancy by adjacent nodes before requesting uplink resources, allowing for precise resource allocation and reducing waste by determining the pre-listen interval and transmitting reporting signals to base stations for resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resources are allocated without accurate channel status assessment, then resource allocation speed is improved, but resource utilization efficiency deteriorates and interference from adjacent nodes increases
Solution Approach 1:
The patent applies preliminary action by implementing a Listen Before Scheduling (LBS) mechanism where terminals perform channel occupancy detection before requesting uplink resources. The base station allocates a pre-listen interval within the channel occupation time during which the terminal must detect channel occupancy by adjacent nodes. This preliminary detection action ensures that resource allocation decisions are based on accurate channel status assessment, thereby improving resource utilization efficiency while maintaining allocation speed through structured timing intervals.
2Reliability
If channel occupancy detection is performed before uplink scheduling, then resource utilization efficiency is improved, but uplink resource information processing time increases
Solution Approach 1:
The patent performs channel occupancy detection in advance during a predetermined pre-listen interval before uplink scheduling decisions are made. By conducting this detection preliminarily and structuring the timing intervals, the system prepares channel status information ahead of time, reducing the processing burden during actual resource allocation and minimizing delays in uplink resource information processing.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal reports channel occupancy detection results to the base station. The base station uses this feedback information to make informed uplink scheduling decisions. This feedback loop enables efficient resource allocation by providing accurate channel status information without requiring extensive processing time, as the detection and reporting are integrated into the existing scheduling framework.
3Object-affected harmful factors
If pre-listen interval is allocated for channel detection, then interference from adjacent nodes is reduced, but channel occupation time is decreased
Solution Approach 1:
The patent allocates a pre-listen interval at the beginning of the channel occupation time during which the terminal performs channel occupancy detection. This preliminary detection period allows the terminal to identify and avoid interference from adjacent nodes before actual uplink transmission begins. By structuring the channel occupation time to include this initial detection interval, the system reduces interference while maintaining efficient use of the overall transmission time.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE). According to various embodiments in the present disclosure, a method of operating a terminal in a wireless communication system comprises receiving information for indicating a pre-listen interval within an allocated channel occupancy time from a base station (BS), transmitting a reporting signal for indicating that occupancy of an unlicensed band by at least one node is not detected during the pre-listen interval, receiving resource allocation information for indicating uplink resources of the unlicensed band allocated based on the reporting signal, and transmitting uplink data through the uplink resources.