Radio Unit Uplink Signal Synchronization via Delay Compensation

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Solution Overview

Problem

In cloud communication center networks, uplink and downlink signals face synchronization challenges due to delays caused by repeaters, leading to inter-carrier and inter-symbol interference, which existing technologies fail to adequately address.

Innovation Solution

A method is introduced to synchronize uplink and downlink signals in virtual radio networks by using delay information from base station control servers to adjust signal transmission times, ensuring signals arrive within a cyclic prefix, thereby preventing interference. This involves calculating uplink and downlink delay information based on repeater distances and processing times to combine and delay signals appropriately.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If signals are transmitted through repeaters in a cloud communication center network, then network coverage and capacity are improved, but signal synchronization deteriorates causing inter-carrier and inter-symbol interference

Engineering Contradiction:

Improvenetwork coverageVSAvoidsignal synchronization

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by calculating and applying delay compensation before signal transmission. The base station calculates delay values based on repeater distances and cyclic prefix lengths, then pre-adjusts transmission timing to compensate for expected delays, ensuring signals arrive synchronized at the destination without interference

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If multiple repeaters are used to extend network coverage, then service area is expanded, but signal delay increases within cyclic prefix requirements

Engineering Contradiction:

Improveservice areaVSAvoidsignal delay

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting transmission timing parameters based on repeater configurations. The system calculates delay compensation values using repeater distances and cyclic prefix lengths, then modifies transmission time parameters to maintain synchronization despite increased path lengths through multiple repeaters

Inventive Principle:

Principle #35Parameter changes

3Loss of time

If direct transmission is used to reduce delay, then signal synchronization is improved, but network coverage is limited

Engineering Contradiction:

Improvesignal delayVSAvoidnetwork coverage

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent applies the intermediary principle by using repeaters as mediators to extend network coverage while managing their delay effects. The repeaters are configured with specific delay compensation parameters, allowing them to serve as intermediaries that expand coverage without causing unacceptable synchronization errors, provided the total delay remains within cyclic prefix limits

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9369194B2Processing uplink signal and downlink signal in radio unit

Publication Date: 2016.06.14 5G SIG CO LTD

AI summary

Described embodiments provide a method for processing an uplink signal in a radio unit. A first uplink signal may be received directly from user equipment. The received uplink signal may be delayed using uplink delay information. A second uplink signal may be received indirectly from user equipment through at least one repeater connected to the radio unit. The delayed first uplink signal and the second uplink signal may be combined and transmitted to a digital unit.