RRC Message Transmission Preallocating Uplink Grants
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Solution Overview
Problem
The current RRC connection resume process in LTE systems exceeds the 5G delay requirement due to processing delays in receiving and processing RRC signaling messages by user equipment, which is not met by the existing LTE processes.
Innovation Solution
A method and system that preallocate and send an uplink grant for RRC uplink responses within the RRC procedure delay time range, allowing the user equipment to send responses without waiting for network allocation, thereby reducing the control plane delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE waits for network allocation of uplink resources after receiving RRC downlink message, then the network can control resource allocation, but the processing delay increases beyond 5G requirements
Solution Approach 1:
The network device pre-allocates uplink grant resources in advance within the RRC downlink message transmission, so that the UE can immediately send the RRC uplink response message without waiting for separate resource allocation. This preliminary action reduces the control plane delay to meet 5G requirements while maintaining network control over resource distribution.
2Speed
If the network sends uplink grant after RRC downlink message, then resource allocation is flexible, but the timing exceeds the RRC procedure delay requirement
Solution Approach 1:
The uplink grant for the RRC uplink response message is merged with the RRC downlink message transmission, both being sent within the same time window. This combining of downlink message and uplink grant ensures the UE can process and respond within the required RRC procedure delay while the network maintains flexible resource allocation capabilities.
Data Source
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AI summary
Embodiments of this application provide a message transmission method, a device, and a system. The method includes: sending an RRC downlink message; preallocating and sending, within a time range of an RRC procedure delay of the RRC downlink message, an uplink grant of an RRC uplink response message corresponding to the RRC downlink message; and receiving, on an uplink resource indicated by the uplink grant, the RRC uplink response message sent by UE from an RRC layer. According to the message transmission method, the device, and the system in the embodiments of this application, a delay generated between receiving the RRC downlink message and feeding back the RRC uplink response message by the UE can be reduced, so that a control plane delay can meet a shorter delay requirement.