PRACH Transmission Repetition Control for NTN Polarization Loss
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Solution Overview
Problem
In non-terrestrial networks (NTN), polarization mismatch between satellite antennas and ground terminals leads to polarization loss, which is inefficiently compensated by repeated transmissions, causing resource waste and increased terminal power consumption.
Innovation Solution
A method for determining a target repetition number for physical random access channels (PRACH) based on indication information from a base station, allowing terminals to adjust their transmission according to their polarization type, thereby compensating for polarization loss and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple repeated transmissions are used to compensate for polarization loss, then the polarization loss is compensated, but the resource efficiency decreases and terminal power consumption increases
Solution Approach 1:
The patent applies local quality by configuring different repetition numbers for different terminal polarization types. Terminals with polarization mismatch (e.g., linearly polarized terminals communicating with circularly polarized satellites) are assigned higher repetition numbers to compensate for polarization loss, while terminals with polarization match are assigned lower repetition numbers. This differentiated approach ensures that only terminals that actually need polarization compensation perform repeated transmissions, thereby reducing overall terminal power consumption while maintaining reliable communication for all terminals.
2Reliability
If multiple repeated transmissions are used to compensate for polarization loss, then the polarization loss is compensated, but the resource efficiency decreases
Solution Approach 1:
The patent implements local quality by assigning different repetition numbers based on terminal polarization characteristics. Terminals experiencing polarization loss are configured with higher repetition numbers to ensure reliable signal transmission, while terminals without polarization loss use lower repetition numbers. This localized differentiation ensures that repeated transmissions are performed only where necessary, thereby maintaining polarization loss compensation effectiveness while improving overall resource efficiency by avoiding unnecessary repetitions.
3Reliability
If a repetition number is configured for all terminals, then polarization loss can be compensated, but terminals without polarization loss experience unnecessary power consumption
Solution Approach 1:
The patent applies local quality by configuring different repetition numbers for different terminal polarization types. Terminals with polarization mismatch are assigned higher repetition numbers to compensate for polarization loss, while terminals with polarization match are assigned lower repetition numbers. This differentiated approach ensures that only terminals that actually need polarization compensation perform repeated transmissions, thereby reducing overall terminal power consumption while maintaining reliable communication for all terminals.
Solution Approach 2:
The patent implements dynamics by making the repetition number configurable and adaptable based on terminal polarization characteristics. The base station determines the appropriate repetition number for each terminal based on its polarization type, allowing the system to dynamically adjust transmission parameters to match actual channel conditions. This dynamic configuration ensures that terminals operate with optimal repetition numbers, avoiding both insufficient compensation and unnecessary power consumption.
Data Source
AI summary
A channel transmission method. The method includes: determining, based on indication information transmitted by a base station, a target repetition number corresponding to a polarization adopted by the terminal; and transmitting, in accordance with the target repetition number, a physical random access channel (PRACH) on one or more random access resources.