SAI List Grouping for MBMS Service Area Distinction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE networks, User Equipment (UE) faces challenges in distinguishing between current and neighboring Service Area Identities (SAIs) for MBMS services, leading to potential unnecessary frequency changes and inefficient resource utilization.

Innovation Solution

A method is introduced where the network node modifies the SAI list by grouping current and neighboring SAIs using a delimiter symbol, such as duplicating the last SAI value or using a predefined symbol, to clearly differentiate between them, allowing UEs to receive and interpret this information accurately.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If the SAI list transmits both current and neighboring SAIs without distinction, then the UE receives comprehensive service area information, but the UE cannot distinguish between current and neighboring SAIs leading to unnecessary frequency changes

Engineering Contradiction:

ImproveSAI distinction informationVSAvoidSAI list structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The SAI list is segmented into distinct groups: current SAIs and neighboring SAIs. Each group is separated by a delimiter symbol (e.g., SAI value 0 or a reserved indicator), allowing the UE to clearly distinguish between current service areas and neighboring service areas without confusion, thus preventing unnecessary frequency changes while maintaining comprehensive service area information.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the network transmits detailed SAI information for both current and neighboring frequencies, then the UE can make informed frequency selection, but the information processing overhead increases

Engineering Contradiction:

ImproveFrequency selection accuracyVSAvoidUE processing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network performs preliminary organization of SAI information by pre-grouping current and neighboring SAIs with appropriate delimiters before transmission. This preliminary structuring allows the UE to rapidly parse and interpret the information without complex processing, reducing UE processing time while maintaining reliable frequency selection accuracy through clear distinction between current and neighboring service areas.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10462718B2Method and arrangements for handling an intra frequency SAI list

Publication Date: 2019.10.29 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method for allowing a user equipment to determine whether Service Area Identities (SAIs) of a list of SAIs are current SAIs or neighboring SAIs by: receiving a list of SAIs from a network node, where the list is indicative of Service Areas capable of providing the broadcasted service to the user equipment and comprise at least one current SAI and at least one neighboring SAI; identifying, in the list, the SAIs as arranged into two distinguishable groups, where a first group comprise the at least one current SAI and a second group comprise the at least one neighboring SAI, and distinguishing, based on the arrangement of the list, current SAIs from neighboring SAIs. A method is also disclosed for arranging a SAI list into the two distinguishable groups by a network node.