Single Transceiver Simultaneous TDD Multi-RAT Links
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Solution Overview
Problem
Current mobile devices are limited to performing time division duplex (TDD) operations using a single radio access technology (RAT) per device transceiver, without simultaneous switching between RATs, and lack support for carrier aggregation in the time domain across multiple TDD communication links.
Innovation Solution
The implementation of apparatus and methods that enable simultaneous TDD communications across multiple RATs using a single transceiver, allowing for the establishment of multiple TDD communication links for simultaneous uplink and downlink data transmissions, including the use of multiple-input and multiple-output (MIMO) antenna diversity for TD-LTE and TD-SCDMA, and carrier aggregation in the time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transceiver is used for TDD operations, then device complexity is reduced, but simultaneous communications across multiple RATs cannot be achieved
Solution Approach 1:
The patent segments the communication protocol handling into separate protocol layers for different RATs (e.g., LTE and TD-SCDMA), allowing a single transceiver to switch between protocols without requiring multiple physical transceivers. The protocol stack is divided into RAT-specific layers that manage the time-division switching, enabling multi-RAT capability while maintaining hardware simplicity.
Solution Approach 2:
The patent implements dynamic time-division switching mechanisms that allow the single transceiver to dynamically alternate between different RAT protocols based on scheduled time slots. The switching is controlled by dynamic timing parameters and protocol state machines that adapt the transceiver operation in real-time, enabling versatile multi-RAT communication without additional hardware complexity.
2Adaptability or versatility
If time division switching between RATs is implemented, then multi-RAT support is achieved, but simultaneous TDD transmissions cannot be performed
Solution Approach 1:
The patent extends TDD operations into the time domain by creating multiple TDD frames with different timing structures for different RATs. Instead of switching RATs within a single time slot, the system allocates separate time-division frames for each RAT, allowing simultaneous uplink and downlink operations across multiple RATs by operating in different time dimensions. This enables carrier aggregation in the time domain, achieving simultaneous transmissions that were previously impossible with single-RAT TDD switching.
Data Source
AI summary
Apparatus and methods for performing simultaneous time division duplex (TDD) communications are disclosed. A wireless communication device can be configured to establish both a first TDD communication link and a second TDD communication link with a network, such as a telecommunication network. Thereafter, the wireless communication device can send TDD uplink data to the network via the first TDD communication link, and receive TDD downlink data from the network via the second TDD communication link, such that a portion of the TDD uplink data is sent to the network at the same time a portion of the TDD downlink data is received from the network. In this manner, the transmissions of TDD uplink data and the TDD downlink data can occur simultaneously, via multiple communication links. Further, the TDD downlink data can be received in multiple, coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity.