Rate Capping for Successive Interference Cancellation in P2P Networks

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Solution Overview

Problem

In ad hoc wireless peer-to-peer networks without infrastructure, terminals face challenges in establishing communication links, managing timing references, and reducing interference due to shared frequency spectra, which affects power efficiency and battery life.

Innovation Solution

Implementing successive interference cancellation (SIC) techniques, where a receiver device determines a transmission rate cap for interfering transmitters, allowing them to operate within a rate that does not interfere with the intended signal, enabling efficient communication while minimizing interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple wireless terminals share a frequency spectrum for peer-to-peer communications, then spectrum utilization is improved, but interference between unintended receivers and transmitters increases

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The receiver device dynamically determines a transmission rate cap for the interferer based on signal strength measurements. This parameter change allows the interferer to adjust its transmission rate to a level that enables the receiver to decode and cancel the interfering signal, thereby resolving the interference while maintaining spectrum sharing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The receiver device sends a control message containing the determined transmission rate cap back to the interferer. This feedback loop enables the interferer to adjust its transmission parameters based on the receiver's decoding capability, allowing multiple terminals to share the spectrum with controlled interference levels

Inventive Principle:

Principle #23Feedback

2Productivity

If a receiver device attempts to decode signals from multiple transmitters simultaneously, then communication efficiency is improved, but the complexity of signal processing increases

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidsignal processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The receiver device performs signal strength measurements and determines the transmission rate cap during the connection scheduling stage, before actual data transmission begins. This preliminary action prepares the receiver to efficiently decode and cancel interfering signals during the subsequent traffic channel stage, reducing real-time processing complexity

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8874040B2Methods and apparatus for successive interference cancellation based on rate capping in peer-to-peer networks

Publication Date: 2014.10.28 QUALCOMM INC

AI summary

In an ad hoc peer-to-peer communication network between wireless devices, a high priory first receiver device is configured to perform successive interference cancellation (SIC). The first receiver device receives a first transmission request from a first transmitter device indicating that the first transmitter device intends to transmit traffic to the first receiver device. Similarly, the first receiver device receives a second transmission request from an interferer second transmitter device. The first receiver device then determines a transmission rate cap for the interferer second transmitter device based on the signal strengths of the first and second transmission requests and sends it to the interferer second transmitter device. The transmission rate cap is a maximum rate at which the first receiver device can reliably decode traffic signals from the second transmitter device.