Half-Duplex Terminal Receiver Branch Switching for Transition Loss
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Solution Overview
Problem
Half-duplex wireless terminals experience performance degradation due to switching time limitations between transmit and receive modes, leading to inefficient use of frequency spectrum and reduced throughput in systems like LTE, especially when coexisting with full-duplex terminals.
Innovation Solution
A half-duplex mobile terminal with two receiver branches and a processing unit that controls a switch to connect one antenna to a receiver branch during receive mode and then to a transmitter circuit, allowing data detection using both branches and optimizing switching times based on output power and frequency band, enabling enhanced detection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a duplex filter is used to support multiple frequency bands, then filtering performance is improved, but device size and cost increase
Solution Approach 1:
The patent divides the single receiver into multiple receiver branches (first receiver branch and second receiver branch), each handling different frequency bands or time intervals. This segmentation allows the system to process multiple bands without requiring a single large duplex filter, thereby reducing overall device size while maintaining filtering performance.
Solution Approach 2:
The patent employs dynamic switching between receiver branches based on the operational mode (transmit or receive) and frequency band requirements. The switch dynamically connects antennas to appropriate receiver branches, enabling adaptive handling of multiple frequency bands without static filtering hardware, thus reducing device size.
2Volume of moving object
If half-duplex operation is implemented, then device size and power consumption are reduced, but throughput and frequency spectrum efficiency deteriorate due to switching time
Solution Approach 1:
The patent prepares the switching mechanism in advance by having multiple receiver branches ready to operate. The switch is pre-configured to quickly transition between receiver branches and transmit circuitry, minimizing the switching time gap and reducing the guard time required, thereby improving throughput while maintaining half-duplex size benefits.
Solution Approach 2:
The patent ensures continuous reception capability by switching between receiver branches during different time intervals. While one receiver branch is transitioning or being used for transmission, another receiver branch continues to receive signals, eliminating idle gaps and maintaining continuous useful action, thus improving throughput without increasing device size.
3Productivity
If switching time is reduced for faster mode transitions, then throughput is improved, but detection precision during transitions deteriorates
Solution Approach 1:
The patent introduces a second receiver branch as an intermediary during mode transitions. While the first receiver branch switches between transmit and receive modes, the second receiver branch continues to receive and detect signals without interruption. This intermediary receiver maintains detection precision during transitions while enabling faster overall mode switching, thus improving throughput without sacrificing precision.
4Measurement precision
If guard time is increased to accommodate switching, then detection precision is improved, but frequency spectrum usage efficiency deteriorates
Solution Approach 1:
The patent prepares receiver branches in advance for upcoming mode transitions, so that switching can occur with minimal guard time. By pre-configuring the switching mechanism and having standby receiver branches ready, the system reduces the required guard time while maintaining detection precision, thereby improving frequency spectrum usage efficiency.
Solution Approach 2:
The patent maintains continuous signal detection by switching between receiver branches during mode transitions. This continuity eliminates the need for long guard times that would otherwise be required to maintain detection precision, allowing tighter scheduling and more efficient frequency spectrum usage while preserving detection accuracy.
Data Source
AI summary
A half-duplex mobile terminal having first and second receiver branches connected, during a receive mode, to respective antennas, is disclosed. One of the antennas is selectively connected to the first receiver branch or to a transmitter circuit. The first antenna is connected to the first receiver branch during a first interval, during which interval data is detected using outputs from both the first and second receiver branches. The first antenna is disconnected from the first receiver branch at the end of the first interval, and, during a second interval immediately following the first interval, data is detected using the output of the second receiver branch. A portion of the incoming transmission that arrives during the transition between the receive mode and transmit mode in a half-duplex transceiver is thus received and detected, improving performance of the half-duplex transceiver.