Wireless Channel Access Procedure Determination in 5G Unlicensed Bands
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently determining a channel access procedure for transmitting uplink signals over unlicensed bands, particularly in 5G communication systems, where high data rates and low latency are required, and existing methods do not effectively manage channel access to ensure fair coexistence with other communication systems.
Innovation Solution
A method and apparatus that involve a terminal and a base station exchanging downlink control information to identify a channel access type and starting position for uplink signals, allowing the terminal to perform a channel access procedure based on the received information, enabling efficient communication over unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a terminal transmits uplink signals in unlicensed bands without proper channel access procedure determination, then transmission speed may be improved, but communication fairness and coexistence with other systems deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting channel access procedure parameters based on downlink control information. The terminal receives DCI containing channel access type indicators and starting position information, which are used to determine appropriate channel access procedures. This allows the system to adapt transmission parameters to achieve both high speed and fair coexistence in unlicensed bands.
2Device complexity
If existing channel access methods are used in 5G systems, then system simplicity is maintained, but efficiency and fairness in unlicensed band communication deteriorates
Solution Approach 1:
The patent segments the channel access determination process into distinct components: receiving DCI with channel access type information, determining the specific channel access procedure based on received indicators, and executing the procedure with identified starting positions. This segmentation allows the system to maintain overall simplicity while achieving high efficiency through structured, modular channel access management.
3Loss of time
If channel access procedures are not correctly determined, then transmission latency is reduced, but communication reliability and protocol compliance deteriorates
Solution Approach 1:
The patent implements preliminary action by having the terminal receive and process downlink control information containing channel access type indicators before initiating uplink transmission. The terminal determines the appropriate channel access procedure and starting position in advance, ensuring both low latency and protocol compliance. This preliminary determination of channel access parameters enables efficient transmission while maintaining reliability.
Data Source
AI summary
A communication technique for convergence between a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system and a technology for Internet of Things (IoT), and a system thereof, are provided. The communication technique and system may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety related services, etc.) based on the 5G communication technology and the IoT-related technology. A method and apparatus for determining a channel access procedure in a wireless communication system are provided.