TDM Uplink Scheduling for Inter-RAT Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in establishing and maintaining concurrent connections with both current and next-generation radio access technologies, such as LTE and 5G NR, due to issues like receiver sensitivity degradation and interference between different frequency bands.
Innovation Solution
The implementation of time division multiplexing (TDM) for uplink data transmissions across multiple radio access technologies, allowing a wireless device to schedule and allocate separate subframes for each technology, thereby avoiding simultaneous transmissions and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmissions on first RAT and second RAT are performed, then uplink data transmission efficiency is improved, but receiver sensitivity degradation and interference occur
Solution Approach 1:
The patent segments the uplink transmission resources by dividing time into separate subframes for first RAT and second RAT transmissions. The wireless device transmits uplink data for first RAT in first subframes and uplink data for second RAT in second subframes, preventing simultaneous transmissions that cause interference while maintaining efficient resource utilization through time-division multiplexing.
2Adaptability or versatility
If concurrent connections with multiple RATs are established, then network connectivity and versatility are improved, but device complexity increases
Solution Approach 1:
The patent merges the transmission of uplink data for first RAT and uplink data for second RAT into a unified time-division multiplexed framework. By coordinating transmissions through a common time schedule where first RAT uses first subframes and second RAT uses second subframes, the device manages multiple RAT connections without proportionally increasing complexity, as the scheduling is harmonized rather than independently managed.
Data Source
AI summary
Apparatuses, systems, and methods for a wireless device to perform substantially concurrent communications with a next generation network node and a legacy network node. The wireless device may be configured to stablish a first wireless link with a first cell according to a RAT, where the first cell operates in a first system bandwidth and establish a second wireless link with a second cell according to a RAT, where the second cell operates in a second system bandwidth. Further, the wireless device may be configured to perform uplink activity for both the first RAT and the second RAT by TDM uplink data for the first RAT and uplink data for the second RAT if uplink activity is scheduled according to both the first RAT and the second RAT.