Dynamic TDD Transmission Grant Updates for Interference Control
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Solution Overview
Problem
In wireless communication systems, dynamic time-division duplexing (TDD) faces challenges in efficiently managing spectrum sharing and controlling interference between uplink (UL) and downlink (DL) communications, particularly for low-priority links that lack knowledge of high-priority link transmissions, leading to suboptimal resource utilization and potential interference.
Innovation Solution
The solution involves updating transmission grants based on medium sensing, allowing low-priority links to modify scheduling parameters such as modulation order, transmit power, and subband allocation, and signaling these updates to ensure efficient resource use and minimize interference, while maintaining compatibility with existing communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is implemented to allow flexible link direction switching, then spectrum utilization efficiency is improved, but interference control between uplink and downlink communications deteriorates because low-priority links lack knowledge of high-priority link transmissions
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter of a low-priority link receives updated transmission grants from the receiver based on medium sensing results. The receiver senses the medium for high-priority link transmissions and provides feedback to the low-priority transmitter, enabling dynamic adjustment of transmission parameters to avoid interference while maintaining high spectrum utilization efficiency
Solution Approach 2:
The patent applies preliminary action by having the receiver perform medium sensing before the low-priority transmitter sends data. The receiver detects potential high-priority link transmissions in advance and communicates this information to the low-priority transmitter through updated transmission grants, allowing the low-priority transmitter to adjust its transmission parameters before interference occurs
2Ease of operation
If low-priority links transmit without knowledge of high-priority link status, then transmission simplicity is maintained, but resource utilization efficiency deteriorates due to suboptimal scheduling decisions
Solution Approach 1:
The patent implements self-service by enabling the low-priority receiver to autonomously perform medium sensing and generate updated transmission grants based on detected high-priority link transmissions. This self-service mechanism allows the low-priority link to make intelligent scheduling decisions without complex external coordination, maintaining transmission simplicity while significantly improving resource utilization efficiency
Data Source
AI summary
Wireless communications systems and methods related to updating control information based on medium sensing are provided. A first wireless communication device communicates with a second wireless communication device, a first transmission grant for a transmission opportunity (TXOP) in a frequency band. The first wireless communication device performs medium sensing for the TXOP. The performing the medium sensing includes detecting a reservation signal for the TXOP. The first wireless communication device transmits, to the second wireless communication device, an updated transmission grant for the TXOP based on at least the first transmission grant and the medium sensing. The first wireless communication device transmits, to the second wireless communication device in the frequency band, data during the TXOP based on the updated transmission grant.