Wake-up Signal Transmission Interference Management
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Solution Overview
Problem
Current methods for transmitting wake-up signals concurrently with data in wireless communication systems, such as those using OFDMA, often result in interference that degrades the performance of wake-up radios, leading to unsatisfactory system capacity and reception quality.
Innovation Solution
A wireless communication node is adapted to determine whether to transmit a wake-up signal concurrently with data based on interference indicators, such as modulation order and resource allocation, and to adjust the transmission accordingly, using techniques like link adaptation and resource management to mitigate interference and enhance the link performance of wake-up signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wake-up signal is transmitted concurrently with data using OFDMA, then system capacity is improved and channel efficiency is enhanced, but interference to wake-up signal reception increases and wake-up radio performance degrades
Solution Approach 1:
The patent segments the available resources into distinct wake-up signal resources and data resources in the time-frequency domain. The wake-up signal is allocated to specific resource elements while data is allocated to other resource elements, creating spatial separation that reduces interference while maintaining concurrent transmission capabilities for improved system capacity.
Solution Approach 2:
The patent applies different transmission parameters and resource allocation strategies specifically for wake-up signal resources versus data resources. By optimizing local resource characteristics (such as power allocation, modulation scheme, and resource element selection) for each signal type, the system achieves both reliable wake-up signal detection and efficient data transmission.
2Reliability
If wake-up signal is transmitted separately from data, then wake-up radio performance is maintained, but system capacity is reduced and channel efficiency decreases
Solution Approach 1:
The patent merges wake-up signal transmission and data transmission into a unified OFDMA framework, allowing both signals to be transmitted concurrently over the same physical medium. By carefully managing resource allocation and power distribution within this combined system, the patent achieves both reliable wake-up signal detection and efficient utilization of available channel capacity.
3Reliability
If transmission power for wake-up signal is increased to improve detection reliability, then wake-up radio performance improves, but interference to data transmission increases and overall system performance degrades
Solution Approach 1:
The patent dynamically adjusts transmission parameters including power allocation, modulation order, and resource element selection based on channel conditions and traffic requirements. By optimizing these parameters adaptively, the system achieves reliable wake-up signal detection while minimizing interference to data transmission and maintaining overall system performance.
Solution Approach 2:
The patent implements feedback mechanisms where the transmitter receives information about channel conditions and reception quality, then adjusts wake-up signal transmission parameters accordingly. This closed-loop control allows the system to maintain reliable wake-up signal detection while adapting power levels to minimize interference to concurrent data transmissions.
Data Source
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AI summary
A method id disclosed of a wireless communication node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers. The method comprises determining a first set of data for concurrent transmission with the wake-up signal, and determining a first interference indicator value indicative of a level of interference caused by the first set of data to the wake-up signal due to concurrent transmission. The method also comprises deciding if the wake-up signal is to be concurrently transmitted with the first set of data based on the first interference indicator value, and transmitting the wake-up signal in accordance with the decision. Corresponding arrangement, wireless communication node and computer program product are also disclosed.