User Terminal Contention-Based Uplink Reference Signal Control
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Solution Overview
Problem
Future radio communication systems face challenges in reducing latency and ensuring high reliability for ultra-reliable and low-latency communications (URLLC) due to the difficulty in controlling contention-based uplink transmission without UL grants, as existing LTE systems are premised on grant-based transmission.
Innovation Solution
A user terminal is equipped with a transmission section to send a first reference signal and UL data signal without UL transmission indication from the radio base station, using code resources to control the generation of the first reference signal, thereby allowing adequate communication in contention-based UL transmission scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If contention-based UL transmission without UL grants is implemented, then latency is reduced and communication speed is improved, but control difficulty increases and reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors uplink transmissions from multiple user terminals and provides control information (UL grants or cancellation indications) in subsequent downlink frames. This feedback loop enables the base station to maintain control over contention-based transmissions, ensuring reliability while allowing low-latency initial transmissions without grants.
Solution Approach 2:
The patent employs preliminary resource allocation where the base station pre-configures uplink resources and provides preliminary control information to user terminals before contention-based transmission occurs. This preliminary setup includes assigning code resources for reference signals and defining transmission parameters in advance, enabling fast contention-based access while maintaining base station control through pre-established rules.
2Measurement precision
If more code resources are allocated for first reference signal in contention-based transmission, then user terminal identification accuracy is improved, but resource consumption increases
Solution Approach 1:
The patent applies local quality by allocating different amounts of code resources to different user terminals based on their specific identification needs and transmission scenarios. The base station can dynamically assign more code resources to reference signals for user terminals that require higher identification accuracy, while using fewer resources for others, thereby optimizing overall resource consumption while meeting individual identification precision requirements.
Data Source
AI summary
The present invention is designed so that communication is performed properly when contention-based UL transmission is used. A user terminal has a transmission section that transmits a first reference signal and a UL data signal, without a UL transmission indication from a radio base station, and a control section that controls generation of the first reference signal by using code resource associated with the user terminal, and the control section controls generation of the first reference signal by using more code resources than code resources that can be used for a second reference signal that is transmitted with the UL data signal in response to the UL transmission indication.