Peer-to-Peer Link Interference Management in WWAN
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Solution Overview
Problem
In wireless wide area networks (WWAN), peer-to-peer communication between devices can cause interference with WWAN resources, and existing methods do not effectively manage this interference to minimize disruptions to base station transmissions.
Innovation Solution
A method and apparatus where a wireless device receives a grant for peer-to-peer communication using time-frequency resources allocated by a base station, with the transmit power determined based on potential interference to base station transmissions, ensuring communication at a power level that minimizes interference and allows concurrent use of resources with WWAN communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If peer-to-peer communication uses WWAN resources, then communication flexibility is improved, but interference with base station transmissions increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power level of peer-to-peer communications based on interference measurements. The system changes the power parameter from a fixed maximum to a variable value that minimizes interference with base station transmissions while maintaining acceptable communication quality, thereby resolving the contradiction between communication flexibility and interference generation.
2Reliability
If transmit power is increased for peer-to-peer communication, then communication reliability is improved, but interference to WWAN communications worsens
Solution Approach 1:
The patent implements feedback mechanisms where the base station measures interference levels caused by peer-to-peer transmissions and uses this information to adjust the allowed transmit power. This closed-loop feedback system ensures that transmit power is optimized to maintain communication reliability while preventing excessive interference with WWAN communications.
Solution Approach 2:
The system dynamically changes the transmit power parameter based on real-time interference conditions. By adjusting this parameter rather than using a fixed high power level, the system maintains communication reliability when needed while reducing interference when WWAN communications are present, thus resolving the contradiction between these two requirements.
3Productivity
If time-frequency resources are shared between peer-to-peer and WWAN communications, then resource utilization is improved, but interference management complexity increases
Solution Approach 1:
The base station acts as an intermediary that manages the shared time-frequency resources between peer-to-peer and WWAN communications. It measures interference levels, determines acceptable power levels, and coordinates transmissions to ensure both communication types can share resources efficiently. This intermediary approach increases resource utilization while managing complexity centrally rather than requiring complex distributed coordination.
Data Source
AI summary
A method of operating a first wireless device includes receiving a grant from a base station for peer-to-peer communication with a second wireless device using time-frequency resources utilized by a third wireless device for WWAN communication with the base station. In addition, the method includes receiving a transmit power for the peer-to-peer communication with the grant. The transmit power is determined based on an interference that can be caused to transmissions received by the base station from the third wireless device. Furthermore, the method includes communicating with the second wireless device at a power less than or equal to the received transmit power using peer-to-peer communication on the time-frequency resources.