Random Access Signaling with Split SIB Delivery for Lower Delay
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Solution Overview
Problem
The existing random access procedures in wireless communication systems, particularly in non-terrestrial networks, suffer from long delays due to the dependency on parsing system information blocks (SIBs) like SIB1 and SIB19, which hampers efficient access and mobility management.
Innovation Solution
The method involves the terminal device receiving an SSB with integrated first resource configuration information to directly obtain necessary system information for random access, and a separate SIB is sent post-access to provide mobility management information, reducing the need for parsing SIB1 and enabling separate transmission of access and mobility-related data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal device receives SIB1 and SIB19 separately through parsing dependencies, then the system information can be transmitted in detail, but the random access delay increases significantly
Solution Approach 1:
The patent segments system information into two distinct parts: minimum system information (MSI) containing random access parameters, and other system information (OSI) containing additional configuration details. This segmentation allows the terminal to acquire critical random access information faster while receiving complete system information, resolving the contradiction between transmission completeness and access delay.
Solution Approach 2:
The patent implements preliminary action by pre-transmitting the minimum system information (MSI) that contains all essential random access parameters before the terminal needs to perform random access. This allows the terminal to immediately perform random access without waiting to parse SIB1 and SIB19, thereby reducing access delay while ensuring complete information transmission.
2Device complexity
If all system information is transmitted in a single SIB, then transmission overhead is reduced, but the terminal cannot obtain mobility management information after access
Solution Approach 1:
The patent divides system information into MSI and OSI, where MSI contains random access parameters and OSI contains mobility management information. This segmentation enables the network to transmit both types of information efficiently - MSI for immediate access and OSI for subsequent mobility management, maintaining low complexity while ensuring adaptability.
Solution Approach 2:
The patent uses preliminary action by transmitting MSI first with all necessary random access parameters, enabling immediate access. After access is established, the network can then transmit OSI containing mobility management information. This sequential approach ensures both low transmission complexity and complete mobility management capability.
3Ease of operation
If the terminal parses SIB1 to obtain SIB19 resource configuration, then resource allocation can be determined, but the access procedure becomes multi-step and time-consuming
Solution Approach 1:
The patent extracts the essential resource configuration information for random access from the SIB1 parsing process and places it directly in the MSI. This extraction eliminates the need for the terminal to parse SIB1 and follow the chain to SIB19, providing resource configuration directly in the minimum system information and significantly reducing access procedure duration.
Solution Approach 2:
The patent implements preliminary action by pre-configuring and transmitting the resource configuration information needed for random access within the MSI itself. This allows the terminal to immediately determine resource allocation without multi-step parsing, reducing access procedure duration while maintaining ease of operation through direct configuration.
Data Source
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AI summary
This application provides a communication method and apparatus, and relates to the field of wireless communication technologies, to reduce an access delay of random access. In this application, a terminal device receives an SSB sent by a network device, where the SSB includes first resource configuration information; the terminal device receives, based on the first resource configuration information, a first SIB sent by the network device, where the first SIB includes first system information, and the first system information is information needed by the terminal device for random access; the terminal device performs random access based on the first system information, to access the network device; and the terminal device receives a second SIB sent by the network device, where the second SIB includes second system information, and the second system information is information used to perform mobility management for the terminal device. In this application, the first SIB is received based on the first resource configuration information, so that a delay in obtaining the first resource configuration information can be effectively reduced, and further, an access delay in a random access procedure can be reduced.