Segmented RRC Message Handover Coordination in 5G Networks

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Solution Overview

Problem

In wireless communication networks, the segmentation of radio resource control (RRC) messages can lead to failed procedures and suboptimal system performance due to intervening events like handovers occurring during transmission, particularly in 5G networks.

Innovation Solution

The base station initiates or suspends handovers based on received RRC message segments, ensuring complete transmission without restarting, by either forwarding segments to the new base station or requesting remaining segments post-handover, allowing seamless communication of segmented RRC messages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station waits to receive all N segments of the segmented RRC message before initiating handover, then the RRC procedure completion probability is improved, but the handover delay increases and radio link failure risk worsens

Engineering Contradiction:

ImproveRRC procedure completion probabilityVSAvoidhandover delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station performs preliminary actions by storing received message segments and preparing handover parameters before the handover is actually executed. The network entity stores the first M segments and prepares handover configuration in advance, so that when handover is triggered, the transition can occur promptly while the message transmission can be completed subsequently without restarting

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the handover timing based on the transmission status of segmented RRC messages. The base station can initiate handover at different stages of message transmission depending on the urgency of handover criteria and the current transmission progress, making the handover process adaptive rather than fixed

Inventive Principle:

Principle #15Dynamics

2Speed

If the base station initiates handover before receiving all N segments, then the handover speed is improved and radio link failure risk is reduced, but the RRC procedure may fail due to incomplete message reception

Engineering Contradiction:

Improvehandover execution speedVSAvoidRRC procedure success rate

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The network entity acts as an intermediary that stores and manages the segmented RRC message parts. The base station forwards received segments to the target base station through the core network, and the target base station can request remaining segments after handover completion, ensuring the message is fully received despite the early handover execution

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The RRC message is divided into multiple segments (N segments total, with M segments received before handover). This segmentation allows the handover procedure to proceed with the available M segments while the remaining N-M segments can be transmitted and received after handover completion, separating the handover execution from the complete message reception

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If the segmented RRC message transmission is interrupted by handover, then the handover procedure can be executed, but the message transmission must be restarted causing increased latency and resource waste

Engineering Contradiction:

Improvehandover execution capabilityVSAvoidmessage transmission latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The useful action of message transmission continues across the handover boundary. Instead of restarting the transmission after handover, the target base station receives the remaining N-M segments from the user equipment, maintaining the continuity of the message reception process and avoiding redundant retransmissions of already received M segments

Inventive Principle:

Principle #20Continuity of useful action

4Reliability

If the base station forwards segments to the target base station during handover, then the message delivery is maintained, but the system complexity increases

Engineering Contradiction:

Improvemessage delivery continuityVSAvoidhandover coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The core network acts as an intermediary that facilitates the forwarding of message segments from the source base station to the target base station. This intermediary approach simplifies the direct coordination between base stations by using existing core network infrastructure and protocols for segment transfer during the handover process

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4000303B1Communication of segmented radio resource control messages

Publication Date: 2025.12.17 GOOGLE LLC

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AI summary

A method for managing communication of a segmented RRC message that includes N segments is implemented in a first base station configured to communicate with a user device. The method includes receiving (222) a first M segments of the segmented RRC message from the user device (M < N), and determining (230), before receiving an (M+1)-th segment, that one or more criteria for initiating a handover to a second base station are satisfied. The method also includes, after determining that the criteria are satisfied, executing a first RRC procedure before a second RRC procedure has completed, where the first and second RRC procedures are different ones of (i) the first base station receiving (264 or 645) at least the (M+1)-th through N-th segments of the segmented RRC message from the user device, and (ii) initiating (233, 332, 433, 532, 633 or 732) the handover to the second base station.