Uplink Signal Mobility Management for 5G Terminals

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Solution Overview

Problem

In ultra-dense 5G networks, conventional mobility management methods based on downlink pilot signals/downlink reference signals lead to significant measurement overheads and power consumption for terminals, resulting in degraded user experience due to frequent cell reselections and handovers.

Innovation Solution

A terminal access method where a network device sends uplink signal configuration information to idle terminals, receives uplink signal measurement information and load from first base stations, and configures mobility to select a candidate serving base station, allowing the terminal to initiate a service request without needing to measure downlink signals or perform reselections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional mobility management based on downlink pilot signal measurements is used in ultra-dense 5G networks, then base station detection capability is improved, but terminal measurement overhead and power consumption increase significantly

Engineering Contradiction:

Improvebase station detection capabilityVSAvoidterminal power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent inverts the conventional downlink measurement approach by implementing uplink signal measurement. Instead of the terminal measuring downlink pilot signals from base stations, the base station measures uplink signals from the terminal. This inversion eliminates the need for terminal-side measurement operations, directly reducing terminal power consumption while maintaining base station detection capability through network-side measurement.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The base station performs self-measurement of uplink signals from terminals, eliminating the need for terminals to perform measurement operations. The base station autonomously measures uplink signal quality and uses this information for mobility management decisions, reducing terminal complexity and power consumption while maintaining accurate base station detection and selection.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If conventional mobility management based on downlink reference signal measurements is used in ultra-dense 5G networks, then cell reselection accuracy is improved, but terminal measurement overhead increases

Engineering Contradiction:

Improvecell reselection accuracyVSAvoidmeasurement overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent shifts the measurement function from terminal-side downlink signal measurement to network-side uplink signal measurement. Base stations measure uplink signals from terminals and report measurement results to the network device, which then makes cell reselection decisions. This approach maintains accurate cell reselection while eliminating the measurement overhead burden from terminals.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The network device acts as an intermediary that collects uplink signal measurement information from multiple base stations and makes centralized mobility management decisions. This intermediary approach consolidates measurement processing in the network, reducing terminal measurement overhead while maintaining accurate cell reselection through comprehensive network-side measurement data.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If frequent cell reselections and handovers are performed in ultra-dense 5G networks, then service continuity is improved, but user experience deteriorates

Engineering Contradiction:

Improveservice continuityVSAvoiduser experience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The network device performs preliminary mobility management by pre-configuring uplink signal measurement parameters and pre-selecting candidate base stations based on uplink measurement information. This preliminary action allows the network to prepare handover decisions in advance, reducing the frequency and impact of actual handover operations, thereby maintaining service continuity while improving user experience by minimizing disruptive handovers.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11445394B2Configuring a candidate serving base station for a terminal

Publication Date: 2022.09.13 CHONGQING XINGJIE SHUXING TECHNOLOGY PARTNERSHIP ENTERPRISE (LLP)

AI summary

A terminal access method includes: sending, by a network device, uplink signal configuration information for an idle terminal to a terminal; receiving, by the network device from a first base station, uplink signal measurement information and load of the first base station, wherein the uplink signal measurement information is obtained by measurement by the first base station upon receiving an uplink signal carrying a terminal identifier from the terminal based on the uplink signal configuration information; and configuring, by the network device, mobility for the terminal based on the terminal identifier, the uplink signal measurement information and the load of the first base station, wherein the configuring mobility is configuring a candidate serving base station for the terminal such that the terminal initiates a service request to enter an active state at the candidate serving base station.