LTE Base Station Frequency Hopping Throughput Optimization

Solution Overview

Problem

In LTE radio communication systems, frequency hopping reduces throughput, making it unsuitable for systems requiring speed-up of throughput, as it involves assigning a radio resource to a radio terminal based on switching of a reference signal without determining an appropriate modulation scheme.

Innovation Solution

A radio base station determines a modulation scheme for a radio resource by using quality information from a second radio resource with a matching or different frequency bandwidth, acquired in the past, to assign resources to a radio terminal in response to frequency switching of a reference signal, employing frequency hopping while maintaining throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If frequency hopping is employed to assign radio resources based on reference signal frequency switching, then resource allocation flexibility is improved, but throughput is reduced due to use of interference-tolerant modulation schemes

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidthroughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The base station performs preliminary determination of modulation schemes by acquiring quality information (CQI, SINR) for past radio resources before actual data transmission occurs. This advance preparation allows the system to pre-establish appropriate modulation parameters based on historical channel conditions, eliminating the need to use conservative interference-tolerant modulation schemes during frequency hopping operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms by continuously acquiring quality information from radio terminals regarding past radio resource performance. The base station uses this feedback information (CQI, SINR values) to determine appropriate modulation schemes for current resource allocation, enabling adaptive modulation that maximizes throughput while maintaining reliability during frequency hopping.

Inventive Principle:

Principle #23Feedback

2Reliability

If a modulation scheme tolerant to interference is used for newly assigned radio resources, then data breakage is prevented, but throughput is reduced

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidthroughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system dynamically changes modulation parameters (MCS values) based on acquired quality information. Instead of using a fixed interference-tolerant modulation scheme, the base station adjusts modulation parameters according to actual channel conditions indicated by CQI and SINR measurements, allowing higher throughput when channel conditions permit while maintaining reliability when needed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The modulation scheme selection is made dynamic rather than static. The system continuously adapts modulation parameters based on real-time quality information acquisition, transitioning from a static interference-tolerant approach to a dynamic adaptation approach that optimizes both reliability and throughput according to actual channel conditions.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If frequency hopping is implemented in LTE systems, then resource allocation flexibility is improved, but the system becomes unsuitable for throughput speed-up requirements

Engineering Contradiction:

Improvefrequency hopping capabilityVSAvoidthroughput speed-up capability

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The base station performs preliminary determination of modulation schemes by acquiring quality information (CQI, SINR) for past radio resources before actual data transmission occurs. This advance preparation allows the system to pre-establish appropriate modulation parameters based on historical channel conditions, eliminating the need to use conservative interference-tolerant modulation schemes during frequency hopping operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms by continuously acquiring quality information from radio terminals regarding past radio resource performance. The base station uses this feedback information (CQI, SINR values) to determine appropriate modulation schemes for current resource allocation, enabling adaptive modulation that maximizes throughput while maintaining reliability during frequency hopping.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9370015B2Radio base station and communication control method

Publication Date: 2016.06.14 KYOCERA CORP

AI summary

An eNB1-1 employs frequency hopping that assigns a radio resource to a UE2-1 in response to switching of a frequency of an SRS from the UE2-1, and determines an MCS in a first radio resource block when a first downlink radio resource block is assigned to the UE2-1, on the basis of SINR acquired for a second downlink radio resource block having a frequency bandwidth equal to a frequency bandwidth of the first downlink radio resource and being assigned to the UE2-1 in the past.