Random Access Time Resource Determination in 5G Systems
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Solution Overview
Problem
Current communication systems lack a method for determining the time domain resource for sending a random access sequence by terminal devices during the random access procedure.
Innovation Solution
The proposed solution involves a network device determining first information based on a configuration table, which indicates one or more time units in random access system frames as candidate time domain resources, and sending this information to the terminal device. The terminal device then determines its time units using this information, ensuring they do not overlap with synchronization signal blocks or control resource sets to minimize collision probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal devices send random access sequences without predetermined time domain resource allocation, then the system maintains flexibility in resource assignment, but collision probability increases and access efficiency deteriorates
Solution Approach 1:
The network device performs preliminary configuration of time domain resources for random access sequences by determining a set of candidate time units and conveying this configuration to terminal devices through system information or RRC signaling. This preliminary action establishes predetermined time domain resources before actual random access occurs, allowing terminals to select from pre-defined non-overlapping time units, thereby reducing collision probability while maintaining system flexibility.
2Area of stationary object
If terminal devices use any time unit for random access sequencing, then time resource utilization is maximized, but conflicts with synchronization signal blocks and control resource sets increase
Solution Approach 1:
The network device extracts and excludes time units that would cause conflicts with synchronization signal blocks or control resource sets from the candidate time domain resource set. By removing these problematic time units from consideration, the system ensures that terminal devices only select from non-conflicting time resources, thereby reducing resource conflicts while maintaining high time resource utilization through optimized candidate selection.
Solution Approach 2:
The system applies local quality by configuring different time domain resource characteristics for different time units. Specifically, certain time units are designated as suitable for random access while others are reserved for synchronization signals or control functions. This localized differentiation of time unit qualities ensures that each time unit serves its intended purpose without interference, reducing conflicts while maximizing overall resource utilization.
Data Source
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AI summary
This application discloses a communications method, and the method includes: receiving, by a terminal device, first information, where the first information is used to indicate one or more first time units in a random access system frame; and determining, by the terminal device, the one or more first time units based on the first information and a configuration table, where one or more time units in the configuration table are determined based on an uplink-downlink configuration period and a second time unit, the one or more first time units are an optional time domain resource of a random access sequence, and the second time unit is an optional time domain resource of a synchronization channel block. According to the method and the apparatus in this application, the optional time domain resource of the random access sequence can be determined.