RRC Connection Control for Wireless Terminals During Cell Reselection

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Solution Overview

Problem

In wireless communication systems, terminals face challenges in establishing a radio resource control (RRC) connection when moving to a new cell, leading to excessive RRC connection requests, wastage of network resources, and increased battery consumption due to unnecessary RRC connections.

Innovation Solution

A method for controlling user equipment (UE) to determine whether to continue or terminate the RRC connection procedure based on establishment parameters and control information received from the UTRAN, specifically for point-to-multipoint services, allowing efficient RRC connection establishment and resource conservation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal continuously transmits RRC connection requests when moving to a new cell, then the RRC connection establishment reliability is improved, but the network resource consumption increases and battery power is wasted

Engineering Contradiction:

ImproveRRC connection establishment reliabilityVSAvoidnetwork resource consumption and battery power

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The terminal performs cell reselection and receives system information (including point-to-multipoint service indicators) before transmitting RRC connection requests. This preliminary action allows the terminal to determine in advance whether RRC connection is necessary, avoiding unnecessary connection requests and reducing network resource consumption while maintaining reliable connection establishment when needed

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal uses feedback from system information (point-to-multipoint service indicators, establishment cause values) to dynamically adjust its RRC connection request transmission behavior. When point-to-multipoint services are detected, the terminal suppresses RRC connection requests; otherwise, it proceeds with normal connection establishment, optimizing the balance between connection reliability and energy efficiency

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the terminal establishes RRC connection in all cells, then the service availability is improved, but the battery power consumption increases due to unnecessary connections

Engineering Contradiction:

Improveservice availabilityVSAvoidbattery power consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The terminal applies different connection establishment strategies based on local cell characteristics. By examining point-to-multipoint service indicators and establishment cause values specific to each cell, the terminal determines whether RRC connection is locally necessary, maintaining service availability where needed while conserving battery power in cells where point-to-multipoint services suffice

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The terminal changes its operational parameters (RRC connection state) based on detected service parameters (point-to-multipoint indicators, establishment causes). When parameters indicate point-to-multipoint service availability, the terminal transitions to idle state without establishing RRC connection, reducing power consumption while maintaining service accessibility

Inventive Principle:

Principle #35Parameter changes

3Speed

If the terminal sends excessive RRC connection requests during cell reselection, then the connection establishment speed is improved, but the network resource efficiency deteriorates

Engineering Contradiction:

Improveconnection establishment speedVSAvoidnetwork resource efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The terminal performs preliminary detection of point-to-multipoint service indicators and establishment cause values before initiating RRC connection requests. This preliminary action enables the terminal to skip unnecessary connection attempts, maintaining fast connection establishment when needed while preventing network resource waste from excessive requests

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal applies partial action by sending RRC connection requests only when necessary (when point-to-multipoint services are not available or establishment causes require connection). This selective approach maintains adequate connection establishment speed for legitimate needs while dramatically improving network resource efficiency by eliminating excessive requests

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS7864726B2Establishment of radio resource control connection in wireless communication system

Publication Date: 2011.01.04 LG ELECTRONICS INC

AI summary

A method for controlling a user equipment (UE) having at least an upper layer which is above a radio resource control (RRC) layer, wherein the UE is capable of receiving a point-to-multipoint service and performing cell reselection in a wireless communication system comprises receiving an establishment parameter from the upper layer. The method also includes transmitting an RRC connection request to a network, and determining, in the RRC layer upon the cell reselection, whether to continue an RRC connection procedure to the network based on the establishment parameter. The method also includes terminating the RRC connection procedure to the network based on a result of the determining step. The RRC connection procedure may be terminated if the establishment parameter indicates a point-to-multipoint service reception.