Multi-Link Transmit Power Distribution for RF Exposure Compliance
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Solution Overview
Problem
Wireless communication devices face challenges in efficiently distributing transmit power among multiple communication links to comply with radio frequency (RF) exposure limits, particularly in multi-link services like extended personal audio networks (XPAN), leading to suboptimal performance in terms of throughput, latency, and transmission range.
Innovation Solution
A wireless device detects active multi-link services and distributes a transmit power budget among communication links based on their properties, such as duty cycle, throughput, and latency, using a centralized controller to manage RF exposure across multiple radio access technologies (RATs), ensuring compliance with RF exposure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power is increased to improve communication performance, then throughput and transmission range are improved, but RF exposure limits are violated
Solution Approach 1:
The patent segments the total transmit power budget into multiple communication links, allocating power individually to each link based on its specific requirements and properties. This allows the system to achieve high total throughput across multiple links while keeping individual link power within RF exposure limits, thereby resolving the contradiction between improving productivity and reducing harmful RF exposure.
2Length of moving object
If transmit power is increased to extend transmission range, then coverage area is improved, but RF exposure limits are violated
Solution Approach 1:
The patent divides the communication task across multiple links, where each link operates at reduced power within RF exposure limits. The combined effect of multiple segmented links achieves extended transmission range and coverage area without any single link violating RF exposure regulations, thus resolving the contradiction between extending transmission range and controlling RF exposure.
3Loss of time
If transmit power is increased to reduce latency, then communication speed is improved, but RF exposure limits are violated
Solution Approach 1:
The patent segments data transmission across multiple communication links that can operate in parallel. By distributing the communication load across multiple lower-power links, the system achieves reduced latency through parallel processing while each individual link maintains transmit power within RF exposure limits, resolving the contradiction between reducing latency and controlling RF exposure.
4Reliability
If transmit power is distributed evenly among multiple communication links, then RF exposure compliance is maintained, but communication performance is suboptimal
Solution Approach 1:
The patent applies local quality by allocating transmit power differently to each communication link based on its specific properties, requirements, and channel conditions. Instead of uniform power distribution, each link receives an optimized power allocation that maximizes its contribution to overall system performance while ensuring RF exposure compliance, thereby resolving the contradiction between maintaining reliability and improving productivity.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques and apparatus for distributing a transmit power budget for a multi-link service in compliance with a radio frequency (RF) exposure limit. An example method of wireless communication includes obtaining a transmit power budget associated with a time interval. The method further includes determining, for each of a plurality of communication links, a first transmit power based at least in part on the transmit power budget and one or more properties associated with the communication links in response to detecting a particular service associated with the communication links is active. The method further includes transmitting a signal using at least one of the respective first transmit powers associated with the communication links in the time interval.