Precoded Sounding Reference Signal Transmission for Uplink Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In higher frequency LTE systems, the coverage of sounding reference signals (SRS) sent by user equipment is reduced, making it difficult for base stations to receive them, which affects uplink channel quality estimation and synchronization.
Innovation Solution
User equipment performs precoding on the SRS using precoding information to generate a precoded signal that is targeted more accurately at the base station, improving the signal's strength and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If communication frequency is increased to improve system capacity and spectrum efficiency, then spectrum efficiency is improved, but coverage of the sounding reference signal is reduced
Solution Approach 1:
The patent changes the parameter of the sounding reference signal by applying precoding transformation. The precoding information (matrix or vector) modifies the signal characteristics to enhance its coverage and reception quality at higher frequencies, resolving the contradiction between spectrum efficiency and signal coverage.
2Reliability
If precoding is applied to the sounding reference signal to improve coverage, then coverage is improved, but device complexity increases
Solution Approach 1:
The base station determines the precoding information in advance and sends it to the user equipment before the user equipment transmits the sounding reference signal. This preliminary action allows the user equipment to apply the precoding without real-time computation, reducing processing complexity while maintaining improved coverage.
3Measurement precision
If precoding information is determined by the base station and sent to user equipment, then reception quality is improved, but signaling overhead increases
Solution Approach 1:
Instead of sending complex precoding matrices, the patent transforms the precoding information into compact parameters (such as precoding matrix indicators or vector indicators) that convey the essential directional information with reduced signaling overhead, while still enabling accurate uplink channel quality estimation.
Data Source
AI summary
The present disclosure relates to the field of mobile communications technologies, and in particular, to a signal transmission method and an apparatus. In the signal transmission method, user equipment receives, from a base station, first information in a physical downlink control channel, where the first information is used for determining precoding information of a sounding reference signal (SRS). The user equipment determines precoding information of the SRS based on the first information. The user equipment performs, based on the precoding information, precoding on the SRS to generate a precoded signal, and sends the precoded signal to the base station.