RRC Connection Collision Handling in NB-IoT Networks

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Solution Overview

Problem

In wireless communication systems, particularly in NB-IoT networks, collisions between RRC connection requests due to multiple RRC connection establishment procedures lead to increased latency and connection setup times, as existing technologies often abort ongoing procedures, resulting in inefficient resource utilization and prolonged connection establishment processes.

Innovation Solution

A method where the UE performs a first RRC connection establishment procedure and, if successful, ignores triggers for a second procedure, while if the first procedure fails, it initiates the second procedure, thereby optimizing resource allocation and reducing unnecessary aborts, allowing successful connections to complete before initiating subsequent requests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE initiates multiple RRC connection establishment procedures simultaneously, then the probability of establishing a connection increases, but connection setup time increases due to collisions and aborts

Engineering Contradiction:

Improveconnection establishment success rateVSAvoidconnection setup time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs preliminary checks to determine whether an RRC connection establishment procedure is already in progress before initiating a new one. This preliminary action prevents overlapping procedures and reduces collisions, thereby maintaining connection success rates while reducing setup time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE dynamically adjusts its connection establishment behavior based on the current state of ongoing procedures. By monitoring whether a procedure is already in progress and adapting accordingly, the system optimizes the balance between connection reliability and setup time without fixed rigid rules.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the UE aborts an ongoing RRC connection establishment procedure, then resource utilization improves, but connection setup time increases due to retransmissions

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidconnection setup time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The UE implements feedback mechanisms to monitor the status of ongoing RRC connection establishment procedures. This feedback allows the system to make informed decisions about whether to continue or abort procedures based on real-time conditions, optimizing both resource utilization and connection setup time by avoiding unnecessary aborts.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The UE autonomously manages its own connection establishment procedures by detecting conflicts and making decisions about continuation or abortion without external intervention. This self-service capability enables efficient resource utilization while minimizing connection setup time through intelligent local decision-making.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11553534B2Handling collisions due to multiple radio resource control (RRC) connection requests

Publication Date: 2023.01.10 QUALCOMM INC

AI summary

Disclosed are techniques for handling collisions between multiple radio resource control (RRC) connection establishment procedures for multiple connection events, such as mobile terminating pages and tracking area updates.