Dynamic TDD Reservation Signals for Interference Control
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Solution Overview
Problem
In wireless communication systems, dynamic time-division duplexing (TDD) faces challenges in efficiently managing transmission opportunities and reducing overhead costs, particularly in priority-based medium sharing schemes where low-priority link communication directions lack knowledge about high-priority transmissions, leading to inefficiencies in spectrum utilization and interference control.
Innovation Solution
The implementation of mechanisms for dynamic TDD, where a target receiver of a low-priority link can monitor reservation signals from a high-priority link to adjust its transmission, allowing for resource utilization without abandoning scheduled communications, and incorporating reduced overhead costs by placing link sharing guard periods and reservation symbols in initial portions of transmission opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is implemented with priority-based medium sharing, then spectrum utilization efficiency is improved, but low-priority links lack knowledge of high-priority transmissions causing interference control issues
Solution Approach 1:
The patent implements a feedback mechanism where the target receiver of the low-priority link monitors for reservation signals from the high-priority link. The high-priority target receiver transmits a reservation signal indicating its intent to access the medium, providing feedback information to the low-priority transmitter. This allows the low-priority link to adjust its transmission based on the high-priority link's transmission intentions, resolving the information asymmetry while maintaining efficient spectrum utilization.
2Reliability
If reservation signals are transmitted frequently to maintain interference control, then interference control is improved, but overhead costs increase
Solution Approach 1:
The patent employs periodic action by placing reservation signals only in initial portions of transmission opportunities rather than continuously. The high-priority target receiver transmits reservation signals at specific periodic intervals (at the beginning of transmission opportunities), which is sufficient to inform low-priority links of upcoming high-priority transmissions. This periodic approach maintains reliable interference control while significantly reducing the quantity of reservation signals and associated overhead costs.
3Reliability
If low-priority links abandon scheduled communications to avoid interference, then interference control is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent enables self-service by allowing low-priority transmitters to autonomously adjust their transmissions based on monitored reservation signals. Instead of forcing low-priority links to abandon scheduled communications, the system provides them with information (reservation signals) that enables them to self-adjust their transmission timing and power. This allows low-priority links to maintain resource utilization efficiency while independently controlling interference through informed transmission decisions.
Data Source
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AI summary
Wireless communication apparatus and methods related to dynamic TDD are described. In aspects, a method of wireless communication over a shared medium may include, receiving, from a base station, control information in a first portion of a transmission opportunity (TXOP), wherein the control information indicates a configuration for triggering a communication of at least one shared medium reservation signal associated with one or more remaining portions of the TXOP; and in response to receiving the control information in the first portion of the TXOP, monitoring for or transmitting the at least one shared medium reservation signal, based on the configuration.