Communication Access With Delay-Doppler Pilots for TRP Selection
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Solution Overview
Problem
The tight coupling of synchronization signals, reference signals, and data information in initial access processes leads to high overhead in TRP selection, particularly in cell-free networks, increasing the resource requirements and complexity.
Innovation Solution
The method involves obtaining a first delay Doppler domain data set by mapping N pilot signals on a resource location, allowing access to P network side devices based on detection results, decoupling synchronization signals and system information, and using OTFS technology for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization signal, reference signal, and data information are tightly coupled in initial access process, then the terminal can obtain system information through detected synchronization signal block and physical broadcast channel, but the overhead of TRP selection increases, causing relatively high overhead of initial access
Solution Approach 1:
The patent segments the initial access process by separating TRP selection from system information acquisition. The terminal first performs TRP selection based on synchronization signals and reference signals, then independently acquires system information from the selected TRP. This segmentation reduces overhead by avoiding redundant transmission of system information from multiple TRPs during the selection phase.
Solution Approach 2:
The patent extracts TRP selection functionality from the coupled synchronization signal block structure. By using dedicated reference signals (such as CSI-RS or specific SS/PBCH block reference signals) separate from the main data information carrying synchronization signals, the terminal can perform TRP selection independently before system information acquisition, reducing the overhead burden on the initial access process.
2Adaptability or versatility
If TRP selection during initial access is performed by using the synchronization signal, then the terminal can select appropriate transmitting and receiving points, but the overhead of TRP selection increases due to tight coupling
Solution Approach 1:
The patent introduces reference signals as intermediary elements between the terminal and multiple TRPs for selection purposes. These reference signals (such as CSI-RS or dedicated preamble sequences) serve as mediators that enable the terminal to evaluate and select TRPs without requiring full system information from each TRP, thereby reducing overhead while maintaining adaptability.
Solution Approach 2:
The patent performs TRP selection as a preliminary action before system information acquisition. The terminal first uses reference signals to identify and select the optimal TRP, then proceeds to acquire system information from the selected TRP. This preliminary selection action reduces overhead by preventing the terminal from processing system information from multiple TRPs simultaneously.
Data Source
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AI summary
This application discloses an access method and apparatus, a communication device, and a readable storage medium. The method includes: obtaining, by a terminal, a first delay Doppler domain data set, where the first delay Doppler domain data set is obtained by mapping N pilot signals on a resource location of a first delay Doppler domain resource block; and accessing, by the terminal, P first network side devices based on a detection result of the first delay Doppler domain data set, where the P first network side devices are any of the following: P first network side devices corresponding to P first resource locations, where the P first resource locations are P resource locations where peak values are detected on the first delay Doppler domain resource block; and P first network side devices corresponding to P first pilot signals, where the P first pilot signals are P pilot signals where peak values are detected.