FDM Transmission for Inter-RAT Dual Connectivity Uplink
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Solution Overview
Problem
Current wireless communication devices face challenges in maintaining accurate signal transmission and reception while supporting multiple radio access technologies (RATs) concurrently, particularly with the introduction of next-generation 5G NR networks, which can strain battery life and increase power consumption.
Innovation Solution
The implementation of Frequency Division Multiplexing (FDM) techniques allows wireless devices to establish concurrent connections with both legacy and next-generation network nodes by allocating specific bandwidth portions for each RAT, using separate or shared transmit chains, and incorporating guard bands to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device maintains concurrent connections with multiple RATs (e.g., LTE and 5G NR) simultaneously, then communication versatility and network coverage are improved, but power consumption increases and battery life deteriorates
Solution Approach 1:
The patent segments the system bandwidth into multiple portions, allocating different bandwidth portions to different RATs for uplink transmissions. This allows simultaneous multi-RAT connectivity while optimizing resource usage and reducing overall power consumption by avoiding full-bandwidth operation on all RATs concurrently.
Solution Approach 2:
The patent implements dynamic bandwidth adaptation where the wireless device can adjust the bandwidth portion allocated to each RAT based on current network conditions, traffic requirements, and power availability. This dynamic allocation optimizes the balance between communication versatility and power consumption.
2Productivity
If FDM techniques are used to perform uplink activity for multiple RATs on the same frequency carrier, then bandwidth utilization efficiency is improved, but signal interference between RATs may increase
Solution Approach 1:
The patent divides the system bandwidth into distinct portions for different RATs, with each RAT transmitting on its allocated bandwidth portion simultaneously. This segmentation enables efficient FDM operation while minimizing interference through proper frequency separation.
Solution Approach 2:
The patent introduces guard bands as intermediary frequency regions between the bandwidth portions allocated to different RATs. These guard bands act as buffers that reduce spectral leakage and minimize interference between adjacent RAT transmissions, enabling safer FDM operation.
3Object-affected harmful factors
If guard bands are implemented between bandwidth portions for different RATs, then interference between RATs is reduced, but total bandwidth available for data transmission decreases
Solution Approach 1:
The patent applies partial guard bands that are just sufficient to provide the necessary interference protection, rather than using excessive guard band width. This optimized approach provides adequate interference reduction while minimizing the bandwidth loss, achieving the best trade-off between protection and capacity.
Data Source
AI summary
Apparatuses, systems, and methods for a wireless device to perform simultaneous uplink activity for multiple RATs in the same carrier using frequency division multiplexing. The wireless device may establish a first wireless link with a first base station according to a first radio access technology (RAT) and a second wireless link with a second base station according to a second RAT. The first base station may provide a first cell operating in a first system bandwidth and the second base station may provide a second cell operating in a second system bandwidth. The wireless device may determine whether the wireless device has uplink activity scheduled according to both the first RAT and the second RAT. If so, the wireless device may perform uplink activity for both the first RAT and the second RAT in the first system bandwidth using frequency division multiplexing.