Wireless Handover Beam Selection Thresholds
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Solution Overview
Problem
Current handover procedures in wireless communication systems face challenges in determining optimal beams during cell transitions, leading to increased power consumption and administrative burdens, as well as the potential for handover ping-pong phenomena and inefficiencies in non-line-of-sight environments.
Innovation Solution
A method and apparatus for handover in wireless communication systems that involve beam scanning using scanning beams with varying widths, where a terminal determines handover based on signal strength differences between serving and target beams, and initiates handover when the differences meet specific threshold values, thereby adapting to different communication environments and preventing ping-pong phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal performs beam scanning by transmitting uplink pilot signals to determine optimal narrow beams, then the terminal can select the optimal beam for handover, but the power consumption for determining the optimal narrow beam increases as the number of narrow beam candidates increases
Solution Approach 1:
The base station transmits downlink reference signals with multiple beam directions before the terminal needs to make handover decisions. The terminal measures these pre-transmitted reference signals and reports measurement results to the base station, which then determines the optimal beam for handover without requiring the terminal to transmit multiple uplink pilot signals. This preliminary action by the base station eliminates the need for the terminal to perform power-consuming uplink beam training.
2Ease of operation
If the administrator manages inter-beam handover success rates using lookup tables to control handover, then the terminal can perform handover without measurement for narrow beams, but the administrator bears the burden of managing handover success rates for all base station beams
Solution Approach 1:
The terminal autonomously performs beam measurement and handover decision by measuring downlink reference signals and determining optimal beams based on measurement results. The base station provides necessary reference signals and receives measurement reports from the terminal, then assists in beam selection. This self-service approach eliminates the need for complex administrator management of handover success rates while enabling the terminal to independently determine optimal beams.
3Adaptability or versatility
If the terminal uses different beam widths for scanning and communication, then the terminal can receive reference signals on sector beams and provide communication service on narrow beams, but determining the optimal narrow beam becomes more complex
Solution Approach 1:
The base station transmits downlink reference signals using multiple beam directions (including sector beams) before the terminal needs to select narrow beams for communication. The terminal measures these pre-transmitted reference signals and uses the measurement results to determine optimal narrow beams for handover. This preliminary transmission of reference signals with various beam widths simplifies the terminal's task of determining optimal beams while maintaining adaptability to different beam width requirements.
Data Source
AI summary
A method for handover in a wireless communication system includes: when a received signal strength difference between a serving beam from a serving base station used for communication by a terminal and a target beam of a neighboring base station is equal to or greater than a first threshold value, and a received signal strength difference between an active beam and the target beam is equal to or greater than a second threshold value, determining a handover to the target beam; and transmitting a message to initiate the handover.