Wireless Scheduling Avoiding Asynchronous Channel Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE wireless communication systems, asynchronous channels, such as the random access channel (RACH), cause significant interference with adjacent wireless resource blocks, leading to deteriorated transmission characteristics and reduced efficiency due to non-orthogonal frequency characteristics.

Innovation Solution

The system employs a scheduling procedure that avoids assigning channels with high transmission rates or low delay characteristics to wireless resource blocks adjacent to asynchronous channels, and uses channel information to invalidate assignments to these blocks, thereby reducing interference and improving transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If asynchronous channels (RACH) are transmitted in the uplink, then random access functionality is enabled, but interference with adjacent wireless resource blocks increases due to non-orthogonal frequency characteristics

Engineering Contradiction:

Improverandom access functionalityVSAvoidinterference with adjacent resource blocks

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes the harmful interference caused by asynchronous channels by identifying and excluding adjacent wireless resource blocks from channel assignment when asynchronous channels are detected. This separation isolates the harmful effect (interference) from the system by preventing other channels from being assigned to interfering blocks.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary scheduling mechanism that mediates between asynchronous channel transmission and other channel assignments. The base station acts as an intermediary by monitoring asynchronous channel presence and dynamically adjusting resource block assignments to prevent interference, thus mediating between the random access functionality and interference reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If wireless resource blocks are assigned to maximize throughput, then transmission efficiency improves, but assignment to blocks adjacent to asynchronous channels causes transmission errors

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidtransmission accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by treating adjacent resource blocks differently from non-adjacent blocks. When asynchronous channels are present, the system assigns different properties to resource blocks: blocks adjacent to asynchronous channels are marked as unavailable for certain channel types, while non-adjacent blocks maintain normal assignment rules. This localized differentiation ensures high reliability for critical channels while maintaining overall system efficiency.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic resource block assignment that adapts to the presence of asynchronous channels. The scheduling is not static but dynamically adjusts based on real-time detection of asynchronous channel transmission. This dynamic approach allows the system to optimize throughput by assigning channels to available blocks while automatically avoiding blocks that would cause transmission errors due to asynchronous interference.

Inventive Principle:

Principle #15Dynamics

3Power

If channels with high transmission rates are assigned to adjacent blocks, then overall system capacity increases, but interference from asynchronous channels causes deterioration of transmission characteristics

Engineering Contradiction:

Improvesystem capacityVSAvoidtransmission characteristic quality

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by proactively identifying and preventing assignment of high-rate channels to resource blocks adjacent to asynchronous channels before interference occurs. The base station performs preliminary checks on resource block availability considering asynchronous channel presence, thus preventing the assignment that would lead to transmission characteristic deterioration while still maximizing system capacity through optimal assignment to safe blocks.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP1956771B1Wireless communication system and wireless communication method

Publication Date: 2017.03.01 FUJITSU LTD

AI summary

In a wireless communication system having a mobile station (10) and a wireless base station (50), the wireless base station (50) has a scheduling processing unit which divides system bandwidth into a plurality of wireless resource blocks in a frequency domain, performs scheduling (S10 ~ S20) so that other channels are not assigned to the wireless resource blocks which are adjacent to a first channel when the first channel whose frequency characteristic is not orthogonal to the other channels is assigned to a certain wireless resource block resulting from the division, and creates scheduling information on the scheduling that is performed; and a transmission unit which transmits the scheduling information created by the scheduling processing unit to the mobile station. The mobile station (10) transmits a channel signal to the wireless base station (50) on the basis of the scheduling information and the wireless base station (50) receives the channel signal transmitted from the mobile station (10).