Dynamic Transmission Power Control for Wireless CSMA Networks

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Solution Overview

Problem

Wireless CSMA networks face challenges in reducing power consumption, minimizing interference, and addressing hidden node problems, where nodes cannot detect each other's transmissions due to network topology, leading to inefficiencies and increased latency.

Innovation Solution

Implementing a transmission power control function in wireless CSMA networks that measures and adjusts power levels based on transmission quality, allowing all nodes within a cell to detect transmissions, using methods like Beacon reports and jump algorithms to optimize coverage and reduce hidden node issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If transmission power level is reduced to save energy, then power consumption decreases, but hidden node problems increase because nodes cannot detect each other's transmissions

Engineering Contradiction:

Improvepower consumptionVSAvoidhidden node detection

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies dynamic power control where transmission power is not fixed but adjusted based on real-time network conditions. Each node dynamically sets its transmit power level according to the power levels of neighboring nodes and detected transmissions, allowing the system to adapt power levels to minimize both energy consumption and hidden node problems simultaneously

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback mechanisms where nodes continuously monitor the power levels of transmissions they detect and use this information to adjust their own power levels. This feedback loop ensures that power levels are optimized based on actual network conditions, resolving the contradiction between energy saving and hidden node detection

Inventive Principle:

Principle #23Feedback

2Reliability

If transmission power level is increased to ensure all nodes can detect transmissions, then hidden node problems are reduced, but power consumption increases

Engineering Contradiction:

Improvetransmission detectionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the power level parameter dynamically based on network conditions. Instead of using a fixed high power level to ensure detection, the system adjusts power levels according to the specific requirements of each transmission scenario, using higher power only when necessary to maintain detection reliability while minimizing overall energy consumption

Inventive Principle:

Principle #35Parameter changes

3Reliability

If RTS/CTS scheme is used to solve hidden node problem, then transmission reliability improves, but radio transmission overhead increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidcontrol traffic overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the need for separate control packets (RTS/CTS) by incorporating power level information directly into the data transmissions themselves. The power level annotations are carried within the data frames, allowing nodes to infer transmission intentions and avoid collisions without requiring additional control traffic

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes data transmissions serve multiple functions: they carry both the actual data payload and power level information for collision avoidance. This multi-functionality eliminates the need for separate control packets, reducing overhead while maintaining transmission reliability through power-based collision detection

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS7835384B2Power control in a communication network and method

Publication Date: 2010.11.16 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

In a wireless network using a carrier sense multiple access (CSMA) scheme is provided a method, system, devices and instruction sets for detecting transmission levels and adjusting the transmission levels for both a connection point and mobile stations within the network in order to reduce power consumption in network devices and minimize interference problems while keeping hidden node problems on a controlled level.