Uplink Reference Signal Segmentation for 5G Beam Tracking
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Solution Overview
Problem
Current beam tracking techniques in 5G MIMO systems, particularly for uplink reference signals, are insufficient and lack efficient methods for high-speed user equipment (UE) mobility, leading to challenges in maintaining accurate beam formation and communication.
Innovation Solution
A terminal apparatus and base station configuration that transmits a first uplink reference signal for channel information acquisition and a second uplink reference signal with a narrower bandwidth and shorter transmission period for efficient beam tracking, allowing the base station to perform scheduling and track UE movement effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single uplink reference signal with wide bandwidth and long transmission period is used for both channel information acquisition and beam tracking, then comprehensive channel information can be obtained, but uplink overhead increases and beam tracking efficiency decreases for high-speed UE
Solution Approach 1:
The patent segments the uplink reference signal function into two distinct signals: a first uplink reference signal for channel information acquisition and a second uplink reference signal for beam tracking. This segmentation allows each signal to be optimized for its specific purpose, reducing overall overhead while maintaining tracking accuracy for high-speed UE
Solution Approach 2:
The patent applies local quality by configuring the second uplink reference signal with specific parameters (narrower bandwidth, shorter transmission period) tailored for beam tracking purposes, while the first reference signal maintains wider bandwidth for comprehensive channel information. Each signal has localized optimization for its specific function
2Speed
If the transmission period of uplink reference signal is shortened to track high-speed UE movement, then beam tracking accuracy improves, but uplink overhead and signaling complexity increase
Solution Approach 1:
The patent separates beam tracking functions into a dedicated second uplink reference signal with shortened transmission period, while the first reference signal maintains its original configuration. This segmentation allows high-speed tracking without requiring all reference signals to be transmitted frequently, reducing overall signaling complexity
Solution Approach 2:
The patent applies partial action by configuring the second uplink reference signal to be transmitted only when beam tracking is required (for high-speed UE), rather than continuously transmitting all reference signals at high frequency. This reduces unnecessary signaling overhead while maintaining tracking capability when needed
3Measurement precision
If uplink reference signal bandwidth is widened to improve channel information accuracy, then channel estimation precision improves, but uplink overhead increases
Solution Approach 1:
The patent segments the bandwidth requirement between two reference signals: the first uplink reference signal uses wide bandwidth for accurate channel information acquisition, while the second uplink reference signal uses narrower bandwidth sufficient for beam tracking. This segmentation satisfies both accuracy requirements while minimizing total overhead
Solution Approach 2:
The patent applies local quality by allocating wide bandwidth specifically to the first reference signal where it is needed for channel estimation, while the second reference signal uses narrower bandwidth appropriate for its beam tracking function, optimizing resource usage locally for each purpose
Data Source
AI summary
[Object] To provide the uplink reference signal for beam tracking.[Solution] A terminal apparatus, including: a communication unit configured to perform communication with a base station configured to form beams and perform communication; and a control unit configured to transmit a first uplink reference signal and a second uplink reference signal which has a narrower target frequency bandwidth and a shorter transmission period than the first uplink reference signal.