Asymmetric Uplink-Downlink Frequency Pairing for 5G Coverage

Solution Overview

Problem

The 5G mobile communication system faces poor coverage performance due to the lack of support for asymmetric uplink and downlink frequency ranges, leading to a narrow coverage area for the uplink frequency band and increased differences between uplink and downlink coverage areas.

Innovation Solution

A method where a network device transmits physical random access channel parameters and frequency information for both downlink and multiple uplink frequency ranges, allowing mobile communication terminals to initiate random access within a target uplink frequency range, thereby pairing low-frequency uplink ranges with high-frequency ranges to enhance coverage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high-frequency bands are used for 5G mobile communication, then data transmission speed is improved, but coverage area deteriorates

Engineering Contradiction:

Improvedata transmission speedVSAvoidcoverage area

Core Design Contradiction:

SpeedVSArea of stationary object

Solution Approach 1:

The uplink frequency band is segmented into multiple frequency ranges (first uplink frequency range and second uplink frequency range) with different frequency characteristics. The first range uses higher frequencies for speed, while the second range uses lower frequencies for coverage, allowing the system to simultaneously achieve both high data transmission speed and wide coverage area through selective use of different frequency segments.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If downlink carrier aggregation is applied, then downlink bandwidth is improved, but uplink-downlink frequency correspondence requirement increases system complexity

Engineering Contradiction:

Improvedownlink bandwidthVSAvoidfrequency correspondence requirement

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by allowing the uplink and downlink frequency bands to have different configurations. Specifically, the downlink uses a single frequency band while the uplink uses two frequency ranges, breaking the traditional symmetric requirement. This asymmetric design enables independent optimization of uplink and downlink resources without requiring strict frequency correspondence, thereby reducing system complexity while achieving carrier aggregation benefits.

Inventive Principle:

Principle #4Asymmetry

3Area of stationary object

If uplink frequency band coverage is enhanced using low-frequency bands, then coverage area is improved, but data transmission speed deteriorates

Engineering Contradiction:

Improveuplink coverage areaVSAvoiddata transmission speed

Core Design Contradiction:

Area of stationary objectVSSpeed

Solution Approach 1:

The uplink frequency band is segmented into multiple frequency ranges (first uplink frequency range and second uplink frequency range) with different frequency characteristics. The first range uses higher frequencies for speed, while the second range uses lower frequencies for coverage, allowing the system to simultaneously achieve both high data transmission speed and wide coverage area through selective use of different frequency segments.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11483868B2Access method, network device, and mobile communication terminal

Publication Date: 2022.10.25 CHINA MOBILE COMM GRP CO LTD

AI summary

An access method, a network device, and a mobile communication terminal are provided. The access method applied to the network device includes transmitting frequency information of a downlink frequency range and at least two uplink frequency ranges and a physical random access channel parameter.