System Information Request for V2X Latency Reduction
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Solution Overview
Problem
In the 5G New Radio (NR) system, user equipment (UE) cannot read the resource pool configuration of a vehicle to everything (V2X) service of a target cell before cell reselection, which fails to meet the low latency requirements of V2X services.
Innovation Solution
A method where the UE sends a system information request message to the first access network device, which then sends an update message to the second access network device, allowing the UE to receive the system information block (SIB) X in advance, enabling the UE to read the resource pool configuration before cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE reads the SIB 21 after cell reselection in the 5G NR system, then the system information is obtained, but the low latency requirement of V2X service cannot be met
Solution Approach 1:
The patent applies preliminary action by enabling the UE to read the SIB X containing V2X resource pool configuration of the target cell before cell reselection is completed. The UE reads this system information during the cell reselection evaluation phase, so that when reselection occurs, the configuration is already available immediately, eliminating the latency that would otherwise occur if reading had to wait until after reselection.
2Loss of information
If the SIB 21 is broadcast to all UEs in the cell, then the resource configuration information is available, but the UE cannot read the target cell configuration in advance
Solution Approach 1:
The patent implements preliminary action by allowing the UE to access and read the SIB X of the target cell during the cell reselection evaluation phase, before the actual reselection is executed. This ensures that the V2X resource pool configuration information is obtained in advance, eliminating the time delay that would occur if the UE had to wait until after reselection to read the system information.
3Device complexity
If the UE waits to read system information after cell reselection, then the reading process is simple, but the V2X service latency requirement is not met
Solution Approach 1:
The patent applies preliminary action by enabling the UE to read the SIB X containing V2X resource pool configuration during the cell reselection evaluation phase, before reselection is completed. This approach maintains the simplicity of the reading process while eliminating the time delay, as the configuration is already available immediately upon reselection without requiring additional reading operations afterward.
Data Source
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AI summary
The present disclosure relates to system information (SI) sending and receiving methods and apparatuses, a device and a system, belonging to the field of communications. Said method comprises: a terminal sending SI request message to a first access network device, the SI request message carrying a neighboring cell identifier and an identifier of a system information block (SIB) X, X being an integer greater than 1; and the terminal receiving Other SI broadcast by a second access network device, the Other SI carrying the SIB X. In the present disclosure, UE sends an SI request message to a first access network device, the first access network device sends a data update message to a second access network device, and the second access network device broadcasts Other SI of a neighboring cell, the Other SI carrying the SIB X for configuring transmission resources, so that the UE can read the SIB X of the neighboring cell in advance before cell reselection, thereby satisfying the low delay requirement of a terminal during service data transmission.