TDD DAS Path Switching via Power Level Sensing
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Solution Overview
Problem
In distributed antenna systems (DAS), there is a challenge in synchronously switching time-division duplex (TDD) communication signals between downlink (DL) and uplink (UL) paths without disrupting or decoding the signals, especially when the system clock used for scheduling is unknown to the communication circuit.
Innovation Solution
A communications control circuit is employed to synchronize with the DL and UL periods by detecting power level changes associated with the TDD communication signal, allowing seamless switching between DL and UL paths based on predefined TDD configurations, ensuring accurate timing without decoding or destructing the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system uses a predefined TDD configuration for scheduling DL and UL periods, then the communication timing can be organized systematically, but the system clock used for scheduling is unknown to the communication circuit, making synchronous switching difficult
Solution Approach 1:
The communication control circuit autonomously synchronizes itself to the TDD communication signal by detecting power level changes and automatically adjusting its switching timing, without requiring external synchronization signals or complex master-clock distribution mechanisms. The circuit serves its own synchronization needs by monitoring the signal it controls.
Solution Approach 2:
The communication control circuit uses feedback from power level detection to adjust its switching timing. By monitoring when power levels increase (indicating DL period start) or decrease (indicating UL period start), the circuit continuously aligns its switching actions with the actual TDD signal timing, compensating for any drift or uncertainty in the predefined configuration.
2Ease of operation
If the communication circuit switches between DL and UL paths based on unknown system clock, then path switching may occur, but the switching cannot be synchronized with the actual DL and UL periods, causing signal disruption
Solution Approach 1:
The patent replaces mechanical/synchronous switching (based on a shared clock signal) with a detection-based switching mechanism. Instead of relying on a mechanical clock distribution system, the control circuit electronically detects power level changes and uses this information to time its switching actions, substituting a robust electronic sensing mechanism for a fragile clock-synchronization mechanism.
Solution Approach 2:
The communication control circuit performs preliminary synchronization by detecting power level changes and determining switching times in advance of actual path transitions. It proactively aligns its switching schedule with the detected TDD periods, ensuring that when switching occurs, it is properly synchronized with the signal transitions.
3Measurement precision
If the communication circuit decodes or destructs the TDD communication signal to detect periods, then accurate period detection can be achieved, but the signal would be disrupted or lost
Solution Approach 1:
The communication control circuit extracts only the necessary timing information (power level transitions indicating period starts) from the TDD communication signal without processing or decoding the actual communication content. It takes out just the synchronization cues needed for switching while leaving the intact signal flow undisturbed for normal communication operations.
Solution Approach 2:
The patent introduces power level detection as an intermediary mechanism between the TDD communication signal and the path switching control. Instead of directly analyzing or decoding the communication signal, the circuit uses power level monitoring as an intermediate step that provides timing information without interfering with the signal's integrity or continuity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables synchronous communication of TDD signals in DAS without disrupting the signal flow, ensuring reliable and efficient communication by synchronizing with the alternating DL and UL periods, even when the system clock is unknown, thus improving coverage and performance in indoor environments.
Implementation Method 1
The communication control circuit is configured to detect the DL periods and/or the UL periods in the TDD communication signal to synchronize to the DL periods and/or the UL periods by sensing a power increase associated with the TDD communication signal in the DL communication path
Data Source
AI summary
Embodiments of the disclosure relate to downlink (DL) and uplink (UL) communication path switching in a time-division duplex (TDD) distributed antenna system (DAS). In this regard, a communications control circuit is provided. The communications control circuit is configured to synchronize to DL periods and UL periods of TDD communication signal to switch a TDD communication signal between a DL communication path and a UL communication path in a DAS accordingly. The communication control circuit is configured to detect the DL periods and/or the UL periods in the TDD communication signal by sensing a power increase associated with the TDD communication signal in the DL communication path. In this manner, the TDD communication signals can be synchronously directed to the DL communication path and UL communication path without destructing and/or decoding the TDD communication signals.