Wireless Transceiver with Switchable RF Chains for Relay Stations
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Solution Overview
Problem
Legacy FDD wireless communication systems lack the necessary transmission/reception band switching capabilities, preventing the use of conventional FDD BS/MS transceivers as relay stations in FDD wireless communication systems, which limits their ability to support various scenarios and efficient data communication.
Innovation Solution
A wireless transceiver for relay stations is designed with multiple RF chain pairs capable of switching between downlink and uplink frequencies, incorporating band switching mechanisms to enable multi-stream bi-directional transmission/reception, MIMO full-duplex and half-duplex operations, and adaptive relay modes, allowing simultaneous communication on different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a legacy FDD wireless transceiver is used, then the device complexity is reduced and ease of manufacture is improved, but the adaptability is insufficient because it lacks Tx/Rx band switching capability for relay station operation
Solution Approach 1:
The wireless transceiver is designed with multi-functionality to operate in both legacy FDD modes (fixed Tx/Rx frequencies) and relay station modes (switchable Tx/Rx frequencies). The same transceiver hardware can perform multiple functions by dynamically switching frequency bands between transmission and reception, eliminating the need for separate dedicated relay station transceivers and reducing overall system complexity.
Solution Approach 2:
The transceiver implements dynamic frequency band switching between transmission and reception bands based on operational mode. The Tx/Rx band switching mechanism allows the system to adapt its frequency allocation dynamically - operating as a legacy FDD device with fixed bands or as a relay station with switchable bands, thereby resolving the contradiction between adaptability and device complexity.
2Adaptability or versatility
If Tx/Rx band switching is implemented for relay station operation, then the adaptability and scenario support are improved, but the device complexity and operation difficulty increase
Solution Approach 1:
The transceiver employs periodic time-division duplexing for band switching operations. The Tx/Rx bands are switched at predetermined time intervals according to a periodic schedule, which simplifies the operation complexity by providing regular, predictable switching patterns rather than requiring complex real-time dynamic switching decisions.
3Productivity
If multiple RF chain pairs are used for simultaneous Tx and Rx on different frequencies, then the productivity and data communication efficiency are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple RF chain pairs into a unified transceiver architecture that can handle simultaneous transmission and reception operations. By combining multiple RF chains under a single integrated transceiver with shared baseband processing and control mechanisms, the system achieves high productivity through parallel frequency operations while reducing manufacturing complexity compared to implementing separate independent transceivers for each RF chain.
Data Source
AI summary
A wireless transceiver and a relay station (RS) including the wireless transceiver, where the wireless transceiver includes multiple antennas; and multiple radio frequency (RF) chain pairs that are connected one-to-one to the antennas and each of which being able to be set to operate on both a downlink frequency and an uplink frequency or to operate only on one of the downlink frequency and the uplink frequency. Each of the RF chain pairs may be able to switch a transmission (Tx) frequency and a reception (Rx) frequency between the downlink frequency and the uplink frequency. For example, each of the RF chain pairs may include a first Tx/Rx band switch that is connected between a local oscillator pair and a mixer pair; and a second Tx/Rx band switch that is connected between an amplifier pair and a duplexer.