Radio Node Adapting Transport Format for Phase Discontinuity

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Solution Overview

Problem

Wireless communication systems face performance degradation due to phase discontinuities and relative phase discontinuities during transmissions from user equipment to radio base stations, particularly when switching between power amplifiers, which can lead to increased losses and errors in decoding.

Innovation Solution

A method and system where a radio network node adapts the transport format of transmissions based on information about mode switching points of the user equipment's radio transmitter, selecting a more robust format to mitigate phase discontinuities, and the node scans the transmit power range to detect these points by measuring relative phase changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the user equipment switches between power amplifiers to handle different transmit power ranges, then the transmit power adaptability is improved, but phase discontinuity occurs degrading transmission reliability

Engineering Contradiction:

Improvetransmit power adaptabilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system performs preliminary actions by detecting mode switching points in advance through uplink transmissions at different power levels. The network node identifies switching points by analyzing phase discontinuities during pilot transmissions, then uses this information to adapt downlink transport formats before actual data transmission, preventing performance degradation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes parameters by adapting the downlink transport format based on detected switching point information. The network node modifies transport format parameters such as resource allocation, modulation scheme, or coding rate to account for the identified switching points, thereby maintaining transmission reliability across different power ranges

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the radio network node adapts transport format based on mode switching information, then transmission performance is improved, but system complexity increases

Engineering Contradiction:

Improvetransmission performanceVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system implements self-service by having the network node autonomously detect mode switching points through uplink transmissions and automatically adapt downlink transport formats without requiring explicit user equipment feedback. The network node serves itself by generating and analyzing pilot signals, identifying switching points, and adjusting transmission parameters in a closed-loop manner

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention uses feedback mechanisms where the network node monitors uplink transmissions, detects phase discontinuities indicating mode switching points, and uses this feedback information to adapt subsequent downlink transport formats. The continuous monitoring and adaptation process creates a feedback loop that optimizes transmission performance

Inventive Principle:

Principle #23Feedback

3Reliability

If the network scans transmit power range to detect mode switching points, then phase discontinuity mitigation is improved, but measurement time increases

Engineering Contradiction:

Improvephase discontinuity mitigationVSAvoidmeasurement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system applies partial action by scanning only specific power levels that are likely to contain mode switching points rather than exhaustively testing all possible power levels. The network node performs measurements at selected power levels during low-traffic periods, accepting that not all switching points may be detected to reduce measurement time

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The invention implements periodic action by performing mode switching point detection at intervals rather than continuously. The network node conducts measurements during designated periods or when triggered by specific conditions such as power level changes, reducing overall measurement time while maintaining adequate detection coverage

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP3139510B1A radio node, a user equipment and methods for managing a transmission

Publication Date: 2018.06.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

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AI summary

A radio network node (110), a user equipment (120) and methods therein for managing a transmission from the user equipment (120) to the radio network node (110) are disclosed. The radio network node (110) adapts (302) a transport format relating to the transmission based on information indicating at least one mode switching point of a radio transmitter (1420). The radio transmitter (1420) is comprised in the user equipment (120). The user equipment (120) adapts (1110) the transmission based on the information indicating at least one mode switching point of the radio transmitter (1420) comprised in the user equipment (120).