Time-Domain Transmission Scheduling for Dual Connectivity Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing interference and collisions due to dual connectivity configurations, particularly in 5G New Radio (NR) systems, where LTE and NR connections operate on different frequency bands, leading to intermodulation and harmonic interferences, and collisions between new and retransmission signals.
Innovation Solution
Implementing a Time Division Multiplexing (TDM) transmission scheme with subframe, HARQ, or time offsets to coordinate uplink transmissions between master and secondary nodes, allowing for staggered resource allocation and minimizing interference and collisions by shifting the initial semi-persistent grants based on these offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual connectivity configurations are used with LTE and NR connections on different frequency bands, then connectivity capacity and network coverage are improved, but intermodulation interference and harmonic interference increase
Solution Approach 1:
The patent segments the transmission resources by dividing uplink transmissions into different time slots (first set and second set of uplink transmissions) that occur at different times. This temporal segmentation allows LTE and NR connections to operate simultaneously on different frequency bands without causing intermodulation interference, as the transmissions are separated in the time domain rather than occurring concurrently.
Solution Approach 2:
The patent implements periodic action by establishing periodic transmission patterns for different uplink transmissions. The first uplink transmissions follow one periodic pattern while the second uplink transmissions follow another periodic pattern with different timing. This periodic structure with staggered timing ensures that transmissions from different frequency bands do not coincide, thereby preventing harmonic and intermodulation interferences while maintaining regular communication intervals.
2Productivity
If simultaneous uplink transmissions are scheduled on LTE and NR frequencies, then communication throughput is improved, but collisions between new and retransmission signals increase
Solution Approach 1:
The patent resolves signal collisions by transitioning from frequency-domain multiplexing to time-domain multiplexing. Instead of attempting to manage simultaneous transmissions across frequency bands (which causes collisions), the patent schedules transmissions along the time dimension, staggering them so that new transmissions and retransmissions occur at different time instances. This dimensional shift eliminates collisions while preserving overall throughput through efficient time resource utilization.
Solution Approach 2:
The patent applies preliminary action by pre-configuring transmission timing patterns and offsets before actual data transmission begins. The network device establishes periodic transmission patterns with specific time offsets for different uplink transmissions in advance. This preliminary timing arrangement ensures that new transmissions and retransmissions are automatically staggered without requiring real-time collision detection or resolution, thereby maintaining high reliability while achieving good throughput.
3Reliability
If time-domain multiplexing with offsets is implemented, then interference and collision likelihood are reduced, but scheduling complexity increases
Solution Approach 1:
The patent manages scheduling complexity through parameter changes by introducing configurable time offsets as key parameters in the transmission scheduling. These offsets can be adjusted based on network conditions, UE capabilities, and traffic requirements. By making the timing parameters configurable rather than fixed, the system can optimize interference reduction while adapting the scheduling complexity to match actual operational needs, preventing unnecessary complexity in scenarios where interference is not an issue.
Data Source
AI summary
Methods, systems, and devices related to time-domain transmission scheduling for user equipment that is capable of operating in dual connections are described. In one exemplary aspect, a method for wireless communication is described. The method includes receiving, at a wireless device, information indicating a time-domain transmission pattern, determining a periodic transmission pattern based on the time-domain transmission pattern and an offset of the wireless device, and transmitting data, to the communication node, according to the periodic transmission pattern.