Wireless Node AGC Presetting From Power Indication Signals

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Solution Overview

Problem

In wireless communication systems, the Automatic Gain Control (AGC) settling period introduces significant overhead, impacting spectral efficiency and user throughput, especially in fast fading channels and vehicle-to-vehicle (V2V) scenarios, where the received power varies significantly, making it challenging to set a single AGC settling time for all sidelink communication cases.

Innovation Solution

A method where a wireless node receives an indicator of the transmission power from a second wireless node, allowing it to pre-set the receiver amplification and reduce or eliminate the need for a dedicated AGC symbol by using a higher frequency numerology for the AGC symbol, reordering OFDM symbols, and employing a specific signal design with a repetition pattern to minimize distortion and overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dedicated AGC symbol is used to ensure sufficient settling time, then AGC convergence reliability is improved, but spectral efficiency and user throughput deteriorate due to overhead

Engineering Contradiction:

ImproveAGC convergence reliabilityVSAvoidspectral efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The transmitting node performs preliminary action by indicating transmission power in advance (in a first wireless signal before the data signal), enabling the receiving node to pre-configure AGC parameters before actual data reception. This preliminary power indication allows the receiver to prepare the appropriate gain settings, eliminating the need for a dedicated AGC settling symbol while ensuring reliable AGC convergence when data reception begins.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If a dedicated AGC symbol is used to ensure sufficient settling time, then AGC convergence reliability is improved, but user throughput deteriorates due to overhead

Engineering Contradiction:

ImproveAGC convergence reliabilityVSAvoiduser throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If a single AGC settling time is used for all sidelink communication cases, then device complexity is reduced, but adaptability deteriorates due to significant received power variation

Engineering Contradiction:

ImproveAGC configuration complexityVSAvoidadaptability to received power variation

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The system transitions from a static, fixed AGC settling time to a dynamic, adaptive configuration. The receiving node determines AGC parameters based on the indicated transmission power, which varies depending on channel conditions, distance, and interference levels. This dynamic adaptation allows the AGC system to optimize settling time for each specific communication scenario without increasing overall system complexity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the AGC configuration parameters dynamically based on the indicated transmission power. Instead of using a fixed settling time, the system adjusts AGC parameters (such as settling time duration or initial gain settings) according to the power level indicated by the transmitter, enabling adaptation to different received power conditions while maintaining simple device operation.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If transmission power is not controlled for multiple receiving nodes, then device complexity is reduced, but received power variation increases

Engineering Contradiction:

Improvepower control complexityVSAvoidreceived power consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The transmitting node performs preliminary action by indicating transmission power in advance to each receiving node. This preliminary indication allows each receiving node to independently determine appropriate AGC parameters based on the expected received power level, compensating for the lack of centralized power control without increasing overall system complexity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11490341B2Wireless node for receiving a wireless signal and method thereof

Publication Date: 2022.11.01 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method for use in a wireless node configured to receive a wireless signal includes receiving, using a first set of physical resources, a first wireless signal including an indicator descriptive of a transmission power used by a second wireless node when transmitting the wireless signal on a second set of physical resources, and receiving, using the second set of physical resources, the wireless signal using an Automatic Gain Control, AGC, configuration, wherein the AGC configuration is determined based on the indicator. The disclosure further relates to a wireless node performing the method.