Random Access Signal Mapping for UE Identification in Cell-Free Networks
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Solution Overview
Problem
In cell-free network systems, the network side device struggles to determine which User Equipment (UE) is sending information due to multiple UEs transmitting the same signals to multiple Access Points (APs, leading to communication ambiguity.
Innovation Solution
The terminal determines a first signal related parameter based on terminal identifier information, which includes sequence identification, time domain, and frequency domain resources, and sends signals like SRS or preambles, enabling the network side device to associate the signal with a specific UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple UEs send the same information (preamble) to multiple APs, then the coverage and connectivity are improved, but the network side device cannot determine which UE the information comes from, causing communication ambiguity
Solution Approach 1:
The patent segments the random access signal transmission by assigning different signal related parameters (sequence identification, time domain resources, frequency domain resources) to different terminals. This segmentation allows the network side device to distinguish between multiple UEs transmitting to multiple APs, resolving the identification ambiguity while maintaining the benefits of multi-AP connectivity
Solution Approach 2:
The patent applies local quality by making the signal characteristics (sequence, time, frequency parameters) specific to each terminal's local identification information. Each terminal's random access signal has unique local properties derived from its identification, enabling the network side device to determine the source terminal even when signals are received at multiple APs
2Measurement precision
If the terminal uses terminal identifier related information to determine signal related parameters, then the network side device can accurately identify the terminal, but the signal configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the relationship between terminal identification information and signal related parameters. The terminal uses its identification information to determine the signal parameters before transmission, and the network side device has pre-established the mapping relationships, simplifying the identification process while maintaining accuracy
Solution Approach 2:
The patent changes parameters by mapping terminal identification information to specific signal related parameters (sequence identification, time domain resources, frequency domain resources). This parameter mapping approach enables accurate terminal identification through systematic parameter variation rather than complex configuration
Data Source
AI summary
A random access method and apparatus, a terminal, and a network side device are provided. The method includes: determining, by the terminal, a first signal related parameter based on terminal identifier related information. The method further includes sending, by the terminal, a first signal based on the first signal related parameter. The first signal includes at least one of a Sounding Reference Signal (SRS) or a preamble of a first random access message. The first signal related parameter includes at least one of the following: sequence identification information of the first signal; a time domain resource for the first signal; or a frequency domain resource for the first signal.