NTN Channel Transmission with Adaptive Cyclic Prefix Length
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Solution Overview
Problem
The cyclic prefix (CP) length defined in terrestrial networks is excessive for non-terrestrial networks (NTN), leading to a waste of transmission resources due to redundancy, as NTN channels are less affected by channel multipath.
Innovation Solution
Adopt a shorter CP length in NTN communication that matches the actual channel conditions, determined by the multipath delay spread, allowing for efficient utilization of transmission resources by reducing CP overheads and increasing the number of symbols available for information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CP length defined in terrestrial network is used in NTN, then channel multipath protection is improved, but transmission resource efficiency deteriorates due to excessive CP redundancy
Solution Approach 1:
The patent changes the CP length parameter from the terrestrial network standard value to an optimized value suitable for NTN. Specifically, it sets the CP length to 2.67μs or 4.69μs based on the NTN channel's multipath delay spread characteristics, which is shorter than the terrestrial network CP length. This parameter change reduces CP overhead while maintaining adequate protection against NTN channel multipath, thereby improving transmission resource efficiency without sacrificing reliability.
2Productivity
If a shorter CP length is adopted in NTN, then transmission resource efficiency is improved, but channel estimation performance may deteriorate
Solution Approach 1:
The patent optimizes the CP length parameter to 2.67μs or 4.69μs, which are specifically calculated based on the NTN channel's multipath delay spread. This optimized parameter ensures that the CP length is sufficient to cover the multipath delay components in NTN, thereby maintaining channel estimation performance. At the same time, these optimized values are shorter than terrestrial network CP lengths, achieving better transmission resource efficiency.
Solution Approach 2:
The patent introduces dynamic CP length adjustment based on different NTN scenarios. It provides multiple CP length options (2.67μs, 4.69μs) that can be selected according to specific channel conditions and service requirements. This dynamic adjustment mechanism allows the system to adaptively balance between channel estimation performance and transmission resource efficiency根据不同场景需求.
Data Source
AI summary
An information transmission method and apparatus are disclosed, to reduce the waste of transmission resources and improve the communication performance of a non-terrestrial network. A first communication apparatus receives configuration information regarding a first time unit, and performs information transmission on a non-terrestrial network channel based on the configuration information regarding the first time unit. The configuration information indicates a quantity (N) of symbols in the first time unit and a cyclic prefix (CP) corresponding to each symbol in the first time unit. A value of N and a value of the CP correspond to a multipath delay spread of the NTN channel, and N is a positive integer.