Beam Detection Tracking Wireless Networks
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Solution Overview
Problem
Conventional beam detection in millimeter wave wireless networks requires significant processing overhead and is typically conducted blindly, making it inefficient and resource-intensive, especially in highly directional mmWave systems where precise beam alignment is necessary for high data rates and spectrum reuse.
Innovation Solution
The method involves the user equipment (UE) selecting beams based on reference signals with associated time offset information, allowing for beam detection and tracking without blind detection, thereby reducing processing resources and signaling overhead. This is achieved by the base station broadcasting cell-specific parameters and reference signals with embedded time offsets, enabling the UE to transmit random access preambles at optimal times, and periodically measuring downlink beam quality to maintain alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind beam detection is used in conventional mmWave systems, then beam alignment can be achieved, but processing overhead and resource consumption increase significantly
Solution Approach 1:
The base station pre-calculates and broadcasts time offset information associated with each downlink beam before the actual beam detection process. This preliminary provision of timing information allows the UE to perform non-blind detection by knowing when to expect signals from specific beams, thereby reducing processing overhead while maintaining alignment accuracy.
Solution Approach 2:
The system enables the UE to autonomously determine beam quality and select optimal beams using the provided time offset information without requiring complex blind search algorithms. The UE self-services the beam detection process by leveraging the embedded timing cues, reducing the need for extensive processing and resource consumption.
2Reliability
If traditional beam detection methods are used, then beam tracking can be performed, but time overhead and signaling overhead increase
Solution Approach 1:
Time offset information is embedded in the reference signals before transmission, providing the UE with advance timing cues for each downlink beam. This allows the UE to perform periodic beam quality measurements at precise intervals without requiring extensive signaling or time overhead for coordination.
Solution Approach 2:
The patent changes the detection approach from blind search to time-synchronized measurement by utilizing the embedded time offset parameter. This parameter change enables the UE to efficiently track beam quality over time by measuring at specific intervals indicated by the time offsets, reducing both time overhead and signaling requirements.
3Ease of operation
If blind beam detection is implemented, then initial access can be established, but processing resources and signaling overhead are consumed
Solution Approach 1:
The base station pre-provides time offset information associated with each downlink beam through broadcasting before the UE needs to perform initial access. This preliminary action enables the UE to efficiently detect beams during initial access by knowing when to measure, reducing processing resources and signaling overhead while maintaining ease of operation.
Solution Approach 2:
The UE performs autonomous beam detection during initial access by utilizing the embedded time offset information in reference signals. This self-service approach allows the UE to independently determine optimal beams without requiring complex blind search procedures or extensive processing resources.
Data Source
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AI summary
A beam detection and tracking embodiment includes receiving cell specific parameters over a wireless channel from a base station. A plurality of downlink beams are received from the base station, each downlink beam comprising a respective reference signal comprising associated time offset information. A random access preamble sequence is transmitted to the base station in a time slot indicated by the time offset information of a selected downlink beam of the plurality of downlink beams.