Half-Duplex Wireless Device DRX Timing Alignment
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Solution Overview
Problem
In half-duplex FDD communication systems, synchronizing the transmit and receive states between wireless communication devices and networks is challenging due to unpredictable delays in the wireless medium, requiring additional signaling and parameters, which increases complexity and delays in initiating half-duplex operations.
Innovation Solution
The proposed solution aligns the start of the receive state of the wireless communication device with a fixed offset from the start of the DRX ON duration, eliminating the need for additional parameters and signaling by using predefined state durations and a MAC or RRC mechanism to notify the network of the preferred state pattern, allowing for efficient half-duplex communication without additional delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional signaling and parameters are used to synchronize transmit and receive states, then reliability of half-duplex communication is improved, but device complexity and initialization delay increase
Solution Approach 1:
The patent extracts and eliminates the need for additional synchronization signaling and parameters by establishing a fixed offset relationship between DRX ON duration and RX state. The RX state automatically aligns with the DRX cycle without requiring extra coordination messages, thereby reducing signaling complexity while maintaining synchronization reliability.
Solution Approach 2:
The half-duplex device autonomously determines its RX state timing based on the pre-configured fixed offset from the DRX ON duration. The device self-synchronizes its receive state without needing network-side synchronization signaling or additional parameters, reducing complexity while ensuring reliable operation.
2Reliability
If additional signaling and parameters are used to synchronize transmit and receive states, then reliability of half-duplex communication is improved, but initialization delay increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the fixed offset relationship between DRX ON duration and RX state before actual communication begins. This pre-configured timing relationship eliminates the need for runtime synchronization signaling, reducing initialization delay while ensuring reliable state alignment from the start of operation.
3Ease of manufacture
If HD-FDD mode is used without a duplex filter, then cost and power consumption are reduced, but communication reliability may be compromised
Solution Approach 1:
The patent applies dynamics by implementing dynamic RX/TX state switching based on the DRX cycle and fixed offset relationship. This dynamic state management enables the device to reliably distinguish between receive and transmit periods without requiring a duplex filter, maintaining communication reliability while reducing hardware complexity and cost.
Data Source
AI summary
A wireless communication device receives an indication of timing alignment of a discontinuous reception (DRX) duration, determines a timing alignment for a reception/transmission (RX/TX) switching pattern of the wireless communication device based on the timing alignment of the DRX duration, and performs half-duplex (HD) communication with a radio access node according to the RX/TX switching pattern having the determined timing alignment.