Terminal Device Uplink Grant Interruption for 5G Resource Management
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Solution Overview
Problem
In 5G mMTC and URLLC communications, the use of scheduled access leads to increased control information overhead and delayed data transmission, while grant-free access can result in resource competition among terminal devices, hindering normal uplink data transmission.
Innovation Solution
A terminal device configuration that manages multiple configured uplink grants per BWP by interrupting and resuming data transmission based on overlapping transmission intervals, determining the order of interruption using RRC messages, and prioritizing data transmission until a set retransmission number is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scheduled access is used, then uplink data transmission is controlled by base station, but control information overhead increases and transmission delay lengthens
Solution Approach 1:
The patent extracts the essential function of uplink data transmission control from the base station and transfers it to the terminal device. The terminal device autonomously selects uplink resources and transmits data without requiring base station scheduling decisions, thereby removing the need for extensive control information exchange while maintaining transmission reliability.
Solution Approach 2:
The patent implements preliminary action by pre-configuring multiple uplink grants with different transmission intervals before actual data transmission. The terminal device has a pool of pre-approved uplink resources that it can immediately utilize when data needs to be transmitted, eliminating the delay of real-time scheduling requests and responses.
2Productivity
If multiple configured uplink grants are set for each BWP, then uplink data transmission opportunities increase, but resource competition occurs among grants
Solution Approach 1:
The patent applies dynamics by making the uplink grant configuration adaptive rather than static. The terminal device dynamically selects which uplink grant to use based on current conditions, and the system can adjust the number and parameters of configured grants based on traffic patterns and channel conditions, optimizing both productivity and reliability.
Solution Approach 2:
The patent utilizes parameter changes by varying transmission intervals and other grant parameters across different configured uplink grants. This diversity in parameters allows the terminal device to select appropriate grants based on data urgency and channel conditions, increasing transmission opportunities while avoiding conflicts through parameter differentiation.
3Quantity of substance
If grant-free access is used, then control information overhead is suppressed, but resource competition among terminal devices occurs
Solution Approach 1:
The patent applies segmentation by dividing the uplink resource space into multiple configured grants with different parameters. This segmentation reduces competition among terminal devices by providing differentiated resource pools, while still maintaining grant-free access characteristics that minimize control information overhead.
Data Source
AI summary
The present disclosure includes a control unit that performs an uplink (UL) data transmission setting according to a radio resource control (RRC) message and a transmitting unit that transmits UL data according to the UL data transmission setting. The RRC message includes setting information of a plurality of configured UL grants (CGs). The setting information includes at least first and second CGs for each of at least one bandwidth part (BWP). The setting information further includes setting information related to transmission intervals for the first and second CGs. The control unit sets at least the first and second CGs for each BWP according to the setting information. The transmitting unit, when at least a part of the transmission interval of the first and second CGs overlap each other, interrupts UL data transmission of the first CG to perform UL data transmission of the second CG.