Random Access Occasion Spacing for Non-Terrestrial Beam Delays
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Solution Overview
Problem
In non-terrestrial communication scenarios, the existing random access occasion configuration in NR is inflexible, leading to interference issues such as preamble detection window overlapping due to varying maximum round trip delay differences between terminal devices served by different beams in the same cell, which is not addressed by current 5G NR standards designed for terrestrial networks.
Innovation Solution
A network device determines a first preamble format based on transmission delay differences for each beam or cell, configuring random access occasions with intervals greater than or equal to the required preamble length to avoid interference, and sends corresponding configuration indices to terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a relatively long preamble is transmitted by using configuration of a random access occasion in NR in the non-terrestrial communication scenario, then the preamble length meets the requirement for large round trip delay difference, but an interference problem such as preamble detection window overlapping occurs, thereby affecting detection probability of the network side for a preamble
Solution Approach 1:
The patent applies dynamics by making the random access occasion configuration flexible and adaptable to different beam conditions. Instead of using a fixed configuration for all beams, the network device dynamically determines configuration parameters (such as time domain positions and intervals) based on the specific round trip delay characteristics of each beam, allowing the system to optimize performance for varying propagation conditions without causing interference
Solution Approach 2:
The patent implements local quality by configuring random access occasions specifically for each beam according to its local characteristics. Each beam receives a customized configuration that matches its propagation conditions, rather than applying a uniform configuration across all beams. This localized approach ensures that each beam's preamble transmissions are properly timed to avoid overlapping with other beams' detection windows
2Device complexity
If an inflexible configuration manner in which the same random access occasion is used for different beams in the same cell in the terrestrial communication scenario is still used in the non-terrestrial communication scenario, then the configuration is simple, but time domain resources are wasted due to different maximum round trip delay differences between terminal devices served by different beams
Solution Approach 1:
The patent applies parameter changes by modifying the random access occasion configuration parameters (time domain positions, intervals, and other settings) according to the specific propagation conditions of each beam. The network device determines appropriate configuration parameters based on the maximum round trip delay difference characteristics of each beam, thereby optimizing resource utilization while maintaining manageable configuration complexity through automated determination
3Ease of operation
If different beams in the same cell are configured by using the same random access occasion, then the configuration is uniform and simple, but preamble detection window overlapping occurs due to large round trip delay difference in non-terrestrial communication
Solution Approach 1:
The patent implements local quality by transitioning from uniform configuration to localized configuration for each beam. Each beam is assigned a random access occasion configuration that is specifically tailored to its propagation conditions, particularly its round trip delay characteristics. This localized approach eliminates the harmful overlapping effect while maintaining operational simplicity through automated configuration determination
Solution Approach 2:
The patent applies segmentation by dividing the cell into multiple beams, each with its own dedicated random access occasion configuration. Instead of treating all beams uniformly, the system segments the configuration space and assigns specific time domain resources to each beam based on its characteristics, thereby preventing interference between different beam transmissions
Data Source
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AI summary
This application discloses a data processing method, including: A network device obtains target information that includes a transmission delay difference corresponding to a target beam or a target cell; determines a first preamble format based on the transmission delay difference, and then determines first configuration information used to indicate the first preamble format and a first set of random access occasions included in a random access period, where an interval between random access times included in the first set is greater than or equal to a preamble length corresponding to the first preamble format; and generates a corresponding first configuration index based on the first configuration information. In the technical solutions of this application, preamble formats required for different beams or cells can be determined based on transmission delay differences corresponding to the different beams or cells, and then configuration information of a random access occasion is further determined. In this way, an interval between configured random access occasions is greater than or equal to a preamble length corresponding to the required preamble format, thereby resolving a mutual interference problem such as preamble detection window overlapping in a non-terrestrial communication scenario.