Dual-Connectivity Uplink Scheduling for Intermodulation Distortion
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Solution Overview
Problem
Dual-connectivity in 5G wireless communication systems faces challenges with intermodulation distortion (IMD) and power sharing issues when simultaneously transmitting uplink signals in LTE and NR, leading to interference and reduced performance.
Innovation Solution
Implementing a method that schedules uplink and downlink signals to use only even or odd subframes for LTE and NR transmissions, respectively, without requiring dynamic coordination or changes to the wireless device or RRC configuration, thereby avoiding IMD and optimizing power sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous uplink transmission in LTE and NR is implemented, then uplink data rate is improved, but intermodulation distortion occurs causing downlink interference
Solution Approach 1:
The patent segments the uplink transmission time by dividing subframes into even and odd groups. LTE uplink is scheduled in even subframes while NR uplink is scheduled in odd subframes, preventing simultaneous transmission. This temporal segmentation eliminates intermodulation distortion while maintaining dual-connectivity functionality.
2Power
If uplink power is shared between LTE and NR, then total power constraint is satisfied, but power sharing penalties reduce transmission performance
Solution Approach 1:
By segmenting uplink transmissions into non-overlapping even and odd subframes for LTE and NR respectively, the patent eliminates the need for power sharing. Each radio access technology transmits in dedicated time slots, allowing full power allocation to each without compromising the other's performance.
3Object-affected harmful factors
If static time-division multiplexing is used for single uplink, then intermodulation distortion is avoided, but bandwidth utilization is reduced
Solution Approach 1:
The patent implements periodic action by alternating between even subframes for LTE uplink and odd subframes for NR uplink in a regular pattern. This periodic time-division multiplexing ensures no simultaneous uplink transmissions occur, eliminating intermodulation distortion while systematically utilizing available bandwidth in both radio access technologies.
Data Source
AI summary
A method and network node for dual connectivity for a wireless device are disclosed. According to one aspect, a method in a network node is provided for use in a dual connectivity mode to communicate with wireless devices (WDs), according to a first radio access technology (RAT), and to communicate with WDs according to a second RAT is provided. The method includes scheduling uplink and downlink signals to be transmitted and received by a first set of WDs such that the first set of WDs are operable to: receive downlink signals and transmit uplink (UL) signals using the first RAT only in even Transmission Time Intervals (TTIs) of the first RAT; and transmit uplink signals using the second RAT only in in UL TTIs of the second RAT that do not collide with even TTIs of the first RAT.