User Equipment Polarization Port Selection for Satellite Handover
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Solution Overview
Problem
In satellite communication systems, user equipment (UE) experiences high energy consumption and signal interference during cell handover, cell selection, or cell reselection due to the need to enable multiple polarization ports to receive signals from neighboring cells, as the polarization method of target cells is unknown beforehand.
Innovation Solution
The UE obtains polarization method indication information from network devices, such as through RRC messages, system information blocks, or downlink control information, allowing it to enable only the necessary port corresponding to the target cell's polarization method, reducing energy consumption and avoiding interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE enables ports corresponding to various polarization methods to measure the target cell, then the UE can accurately measure the target cell, but the energy consumption of the UE is relatively high
Solution Approach 1:
The network device performs preliminary action by determining and indicating the polarization method of the target cell to the UE before the UE performs cell measurement. This allows the UE to advance-prepare by enabling only the specific port corresponding to the indicated polarization method, rather than enabling all ports, thus reducing energy consumption while ensuring accurate measurement capability.
2Adaptability or versatility
If the UE enables ports corresponding to various polarization methods to measure the target cell, then the UE can handle unknown polarization methods, but signal interference from neighboring cells increases
Solution Approach 1:
The network device provides advance information about the polarization method of the target cell through indication information. This preliminary action enables the UE to selectively activate only the necessary receive port matched to the target cell's polarization method, thereby maintaining adaptability to the target cell while avoiding the activation of ports that would receive interfering signals from neighboring cells with different polarization methods.
3Object-affected harmful factors
If the satellite transmits signals in a polarization multiplexing manner, then signal interference is reduced, but the UE requires multiple ports increasing complexity
Solution Approach 1:
The network device performs preliminary determination and indication of the polarization method for the target cell. This advance information allows the UE to simplify its port configuration by enabling only the single port corresponding to the indicated polarization method, rather than maintaining multiple ports for all possible polarization methods, thus reducing device complexity while preserving the interference-reduction benefits of polarization multiplexing.
Data Source
AI summary
The technology of this application relates to an information transmission method, an apparatus, and a system. The method includes user equipment receives first indication information sent by a first network device, where the first indication information includes a polarization method of a target cell, and the user equipment performs cell measurement on the target cell based on the polarization method of the target cell. According to the method, the user equipment can obtain the polarization method of the target cell before entering the target cell. In this way, when performing cell handover and reselection, the user equipment can enable, based on the polarization method of the target cell, only a port corresponding to the polarization method of the target cell, to receive a satellite signal, and perform cell measurement on the target cell, to complete cell handover and reselection procedures.