5G NR Terminal Rate Control via Beam and MCS Adaptation
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Solution Overview
Problem
Current data transmission rate control methods for high frequency band scenarios in 5G NR communication systems are inefficient due to high overheads in generating scheduling information and long latency caused by long reference signal periods, leading to suboptimal quality of service (QoS).
Innovation Solution
A data transmission rate control method where a terminal device receives beam indication information and scheduling information from a base station, determines optimal beams and modulation and coding schemes (MCS) based on candidate beam pair links, and adaptively adjusts transmission rates to ensure higher MCS and rank indications, reducing the need for frequent scheduling information generation by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station measures reference signal in real time to obtain CSI and generates scheduling information based on CSI, then data transmission rate control can be achieved, but overheads for generating scheduling information become high
Solution Approach 1:
The terminal device pre-calculates and determines the MCS index and rank indication based on current channel conditions and buffer status, then reports these parameters to the base station. This preliminary action eliminates the need for the base station to perform real-time reference signal measurement and CSI calculation, significantly reducing scheduling information generation overhead while maintaining accurate rate control capability.
2Device complexity
If the terminal device sends reference signal with long period, then overheads are reduced, but latency increases and CSI cannot reflect current channel state
Solution Approach 1:
The terminal device autonomously determines its own transmission parameters (MCS index and rank indication) based on local channel measurements and buffer status, then reports only these determined parameters to the base station. This self-service approach allows the terminal to maintain up-to-date channel state information without requiring frequent reference signal transmissions, thus reducing overheads while maintaining low latency and current CSI accuracy.
3Device complexity
If reference signal period is extended, then overheads decrease, but QoS of data transmission cannot be ensured due to outdated CSI
Solution Approach 1:
The terminal device continuously monitors channel conditions and buffer status, then provides feedback to the base station in the form of determined MCS index and rank indication parameters. This feedback mechanism ensures that the base station always has current transmission parameters to maintain QoS, while the terminal's autonomous determination process eliminates the need for frequent reference signal transmissions, thus reducing overheads without compromising reliability.
Data Source
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AI summary
Embodiments of the present invention relate to the field of communications technologies, and disclose a data transmission rate control method and a device, to reduce overheads for generating scheduling information, and ensure QoS of data transmission. A specific solution is as follows: A terminal device receives beam indication information sent by a base station; the terminal device receives scheduling information sent by the base station; the terminal device determines at least one beam based on a set of N candidate BPLs; the terminal device determines second modulation and coding indication information according to first modulation and coding indication information; and the terminal device transmits data on the at least one beam according to resource indication information and the second modulation and coding indication information. The embodiments of the present invention are applied to an uplink data transmission rate control process in NR.