RRC Release Complete Message Structure for 5G Resource Efficiency
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Solution Overview
Problem
Existing control schemes using timers for releasing Data Radio Bearers (DRBs) and Signaling Radio Bearers (SRBs) in 5G networks are inefficient, as they slow down the release process, leading to suboptimal utilization of communication resources during interface disconnections between base stations and core networks.
Innovation Solution
A method where a terminal apparatus and base station apparatus transmit RRC Release Complete messages as responses to RRC Releases, including PDU Session Release Complete as NAS messages, allowing for immediate release of DRBs and SRBs without relying on timers, thereby enabling efficient communication resource utilization during interface disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a timer-based control scheme is used to release DRBs and SRBs, then the release process can be managed in a controlled manner, but the release speed is reduced due to the timer waiting period
Solution Approach 1:
The base station includes the PDU Session Release Command as a NAS message within the RRC Release message in advance. This allows the terminal to process both the RRC release and PDU session release simultaneously, eliminating the need for a timer-based waiting period and enabling immediate resource release while maintaining controlled management of the release process.
2Device complexity
If the RRC connection is released before transmitting PDU Session Release Complete, then the release process is simplified, but the PDU Session Release Complete cannot be transmitted to the core network
Solution Approach 1:
The terminal transmits the PDU Session Release Complete message as a NAS message within the RRC Release Complete message before the RRC connection is fully released. This preliminary action ensures that the core network receives the release confirmation while the RRC connection is still active, avoiding the need to re-establish the connection solely for this purpose.
Solution Approach 2:
The invention combines the RRC Release Complete message with the PDU Session Release Complete message by including the NAS message within the RRC message structure. This merging allows both the radio resource release confirmation and the PDU session release confirmation to be transmitted simultaneously in a single message, simplifying the overall release process while ensuring all necessary information is delivered to the core network.
3Reliability
If a timer is used to prevent RRC connection re-establishment, then unnecessary connection re-establishment is avoided, but communication resource utilization efficiency is reduced
Solution Approach 1:
The base station includes the PDU Session Release Command within the RRC Release message in advance, allowing the terminal to process both releases simultaneously. This eliminates the need for a timer-based prevention mechanism while ensuring that the terminal does not attempt unnecessary RRC connection re-establishment, as the PDU session release is already confirmed through the included NAS message.
Solution Approach 2:
The invention extracts the PDU Session Release Command from the traditional timer-based control flow and embeds it directly within the RRC Release message. This extraction allows the release process to proceed immediately without relying on timer expiration, thereby improving communication resource utilization efficiency while maintaining the reliability of preventing unnecessary re-establishment.
Data Source
AI summary
Provided is a technique that enables more efficient utilization of a communication resource at the occurrence of disconnection of an interface between a base station and a core network or an interface within the core network. A process of receiving an RRC Release that is an RRC message transmitted from a base station and a process of transmitting, to the base station, an RRC Release Complete as a response to the RRC Release are carried out. The RRC Release Complete includes, as an NAS message, a PDU Session Release Complete that is a response to a PDU Session Release Command which is included, as an NAS message, in the RRC Release.