Sounding Reference Symbol Beam Tracking via Preliminary Action
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Solution Overview
Problem
In wireless communication systems, especially above 6 GHz, the fast temporal variation of channels and potential Transmission/Reception (Tx/Rx) beam mismatch due to varying terminal environments lead to inefficiencies in beam scanning and tracking, with existing methods not adequately addressing the need for effective Sounding Reference Symbol (SRS) transmission for beam tracking.
Innovation Solution
A method and terminal configuration for transmitting SRSs, which involve receiving control information including SRS resource pool details from a base station, and transmitting SRSs based on this information to track Tx beams, with the option to select the best Tx beam for uplink signal transmission, reducing signaling overhead and handling ambiguity in subframe types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam scanning is performed to track Tx beams, then beam tracking accuracy is improved, but processing overhead increases and time consumption increases
Solution Approach 1:
The patent applies preliminary action by performing beam scanning and SRS transmission in advance during idle periods or downlink subframes, so that beam tracking information is ready before uplink transmission is needed. This allows the terminal to quickly switch to the pre-determined best beam without performing time-consuming beam scanning at the moment of transmission.
Solution Approach 2:
The patent segments the beam tracking process into distinct phases: beam scanning phase (using SRS in downlink subframes or idle periods), information collection phase (BS determines best beam), and execution phase (terminal uses pre-determined best beam for uplink). This segmentation allows beam tracking to occur independently from uplink transmission timing constraints.
2Measurement precision
If beam scanning is performed frequently to track fast temporal channel variation, then beam tracking accuracy is improved, but processing overhead increases
Solution Approach 1:
The patent implements periodic beam tracking by configuring SRS transmission with specific periodicity and subframe offsets. Instead of continuous beam scanning, the terminal performs SRS transmission at periodic intervals configured by the network, allowing beam tracking to keep up with temporal channel variations while avoiding excessive processing overhead from continuous scanning.
Solution Approach 2:
Beam tracking information is obtained in advance during downlink subframes or idle periods, preparing the best beam information before it is needed for uplink transmission. This preliminary action allows the system to handle fast temporal variations without increasing processing overhead during critical transmission moments.
3Adaptability or versatility
If SRS transmission is performed for beam tracking, then beam tracking capability is improved, but signaling overhead increases
Solution Approach 1:
The patent makes SRS transmission multi-functional by using the same SRS resources for both traditional channel sounding purposes and beam tracking purposes. The base station can interpret SRS measurements for multiple functions including beam management, channel quality indication, and uplink channel estimation, thereby improving beam tracking capability without adding separate dedicated signaling channels.
Solution Approach 2:
The patent merges beam tracking functionality with existing SRS transmission mechanisms. Instead of creating separate beam tracking reference signals, the system combines beam tracking requirements with regular SRS transmission, allowing the same signal to serve both channel sounding and beam management functions simultaneously.
Data Source
AI summary
A method for transmitting, by a terminal, an SRS in a wireless communication system comprises the steps of: receiving, from a base station, control information including SRS resource pool information for tracking a transmission beam of the terminal; and transmitting the SRS to the base station on the basis of the control information, wherein the SRS is an SRS used for tracking the transmission beam of the terminal.