Wireless Terminal Layer 1-2 Cell Reporting for Handover Delay Reduction
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Solution Overview
Problem
Current wireless communication systems face delays in cell handover processes due to long transmission paths for reporting cell measurement results and beam measurement results, which affects communication continuity and service quality.
Innovation Solution
A wireless communication method where a terminal device determines measurement results of cells and reports cell quality information or triggers a handover process directly through Layer 1 or Layer 2, reducing the transmission path and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell measurement results are reported through the RRC layer (layer 3), then the reporting path follows standard protocol procedures, but the transmission path becomes long causing large reporting delays
Solution Approach 1:
The patent introduces a new reporting mechanism that acts as an intermediary between the measurement function and the network device. Instead of using the traditional RRC layer path, the measurement results are reported through a shortened path via physical layer indicators (PMI/RI/CQI) that directly reach the network device, bypassing the lengthy L3-L2-L1 transmission chain while maintaining protocol compliance through configured reporting formats.
Solution Approach 2:
The patent segments the measurement reporting function into multiple parts: beam-level measurements are performed and processed separately from cell-level decisions. The beam measurement results are used to determine cell quality information, which is then reported through the optimized path. This segmentation allows different layers to handle different aspects of measurement, reducing overall delay.
2Loss of information
If beam measurement results are reported periodically through layer 1 or under network device indication, then the network can obtain mobility information, but the network device remains unclear about terminal mobility during handover preparation
Solution Approach 1:
The patent implements preliminary action by having the terminal device perform cell quality evaluation based on beam measurement results before the network device requests handover preparation. The terminal proactively identifies candidate cells and prepares measurement reports that include both beam-level and cell-level information, enabling the network device to make informed handover decisions without waiting for periodic reports or explicit terminal indications.
3Extent of automation
If the terminal device triggers handover through layer 3, then the handover process can be initiated, but the message transmission path becomes long causing extended handover delay
Solution Approach 1:
The patent replaces the mechanical message-passing system (L3 messages traveling through L2 to L1 and then to the network) with a more direct information transmission mechanism. The terminal device uses physical layer signaling and optimized reporting structures to convey handover-triggering information directly to the network device, substituting the multi-layer message passing with a streamlined information flow that maintains automation while reducing delay.
Data Source
AI summary
A wireless communication method includes: determining a measurement result of at least one cell; and in a case where a cell whose measurement result meets a corresponding condition exists in the at least one cell, performing, through a layer 1 or a layer 2, any one of: reporting cell quality information of the at least one cell, reporting cell quality information of at least one first candidate cell, and triggering a handover process.