Broadcast Redirection for Faster UE Cell Reselection

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Solution Overview

Problem

The existing cell selection and reselection procedures in LTE and NR networks involve substantial signaling delays due to unicast messaging, leading to prolonged UE connection latency and inefficiencies.

Innovation Solution

Implementing a method where network nodes broadcast redirection information, allowing UEs to perform cell selection or reselection procedures based on acquired broadcasted information, reducing the need for dedicated signaling and latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If unicast messaging is used for cell selection or reselection procedures, then specific redirection information can be provided to UEs, but substantial signaling delays occur and connection latency increases

Engineering Contradiction:

Improveredirection information deliveryVSAvoidsignaling delay

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The network node pre-configures redirection information in the UE before the UE needs to perform cell selection or reselection. This preliminary configuration allows the UE to immediately execute redirection without waiting for unicast messaging, thereby reducing signaling delay while ensuring accurate redirection information delivery.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of transmitting redirection information through lengthy unicast signaling exchanges, the patent uses broadcast messaging to copy and distribute redirection information to multiple UEs simultaneously. This approach maintains information accuracy while dramatically reducing the time required for information delivery compared to individual unicast messages.

Inventive Principle:

Principle #26Copying

2Loss of information

If unicast messaging procedures are implemented for cell selection, then specific system information can be transmitted, but the procedure complexity and signaling overhead increase

Engineering Contradiction:

Improvesystem information transmissionVSAvoidsignaling procedure complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The broadcast messaging mechanism serves multiple functions simultaneously: it transmits system information, provides redirection instructions, and configures UE behavior all in a single messaging operation. This universal approach eliminates the need for multiple separate unicast signaling exchanges, reducing procedural complexity while maintaining comprehensive information transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines system information transmission and redirection information delivery into a single broadcast messaging operation. By merging these functions that were previously handled separately through unicast messaging, the overall signaling procedure complexity is reduced while ensuring all necessary information reaches the UEs.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If UEs wait for RRC Release with redirect information after random access, then accurate redirection can be achieved, but connection establishment time is prolonged

Engineering Contradiction:

Improveredirection accuracyVSAvoidconnection establishment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Redirection information is provided to UEs in advance through broadcast messaging before the UEs need to perform random access or wait for RRC Release messages. This preliminary provision of accurate redirection information allows UEs to immediately execute redirection upon receiving the broadcast, eliminating the waiting period while maintaining redirection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The broadcast messaging acts as an intermediary that delivers redirection information to UEs without requiring the traditional RRC Release signaling exchange. This intermediary mechanism provides accurate redirection information directly to UEs, bypassing the time-consuming RRC Release wait period while ensuring reliable information delivery.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260032522A1Methods and devices for enabling cell selection or cell reselection procedures

Publication Date: 2026.01.29 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method for operating a User Equipment, UE, in a wireless communication network. The method includes acquiring broadcast information comprising redirection information and performing a cell selection or cell reselection procedure based on the acquired broadcasted information. A corresponding UE and a computer program are also disclosed. There is also disclosed a method for operating a network node serving a User Equipment, UE, in a wireless communication network. The method includes broadcasting information having redirection information enabling the UEs to perform a cell selection or cell reselection procedure. A corresponding network node and computer program are also disclosed.