Radio Transmitter Power Control for Inter-Path Isolation

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Solution Overview

Problem

In star-shaped radio communication systems, achieving sufficient isolation between paths to reduce interference is challenging, especially when frequency reuse is desired, as traditional methods like large frequency separation and node cancellation are not optimal.

Innovation Solution

A radio system design where transmitters in each unit adjust their output power levels in response to requests from external units, maintaining power balance and reducing interference by synchronizing power variations, and incorporating cancellation circuits to mitigate interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If large frequency separation is used between paths, then inter-path interference is reduced, but frequency reuse is limited

Engineering Contradiction:

Improveinter-path interferenceVSAvoidfrequency reuse

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent changes the power parameter dynamically by allowing transmitters to vary their output power levels in response to requests from external radio units. This enables the system to maintain frequency reuse while managing interference through power adjustment rather than frequency separation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements feedback mechanisms where external radio units send requests to transmitters about desired power levels, and transmitters adjust their output accordingly. This closed-loop control enables dynamic interference management while maintaining frequency reuse efficiency.

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If node cancellation is used to reduce inter-path interference, then interference is reduced, but system complexity increases

Engineering Contradiction:

Improveinter-path interferenceVSAvoidsystem complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary power control mechanism that mediates between multiple transmitters and external radio units. This intermediary control system simplifies the overall architecture compared to complex node cancellation circuits by using centralized power level coordination.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If transmitters operate at high power levels, then communication range is extended, but interference to other paths increases

Engineering Contradiction:

Improvetransmitter power levelVSAvoidinterference to other paths

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent makes the transmitter power level dynamic rather than static. Transmitters continuously adjust their power levels based on real-time requests from external radio units, enabling the system to optimize between communication range and interference generation adaptively.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUSRE47346E1Radio system

Publication Date: 2019.04.09 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A radio system (110) comprising a first (120) and a second (130) radio unit which comprise a transmitter (122, 132) and a receiver (121, 131). The first radio unit (120) communicates with a first external radio unit (101) and the second radio unit (140) with a second external radio unit (102). Both transmitters (122, 132) are arranged to vary their output power level in response to a request from the external radio unit with which they are arranged to communicate. Both of the transmitters also vary their output power level in response to a variation in the transmitter output power level of the other radio unit.