Scheduling Legacy UEs in High-Speed Bidirectional Scenarios
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Solution Overview
Problem
In high-speed environments, such as those encountered by trains, legacy UEs without advanced receiver capabilities face challenges in maintaining reliable communication due to significant Doppler shifts between radio heads, leading to inefficient resource allocation and performance degradation.
Innovation Solution
A network node that schedules communication resources based on location and capability information, prioritizing UEs with advanced receivers in challenging conditions and allocating resources efficiently by distinguishing between zones near and between radio heads, thereby optimizing resource use and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy UEs are scheduled in high-speed bidirectional scenarios, then communication coverage is maintained, but resource allocation efficiency deteriorates due to significant Doppler shifts between radio heads
Solution Approach 1:
The patent applies local quality by differentiating scheduling strategies based on UE location and capability. Advanced UEs with large bandwidth receivers are scheduled in zones between radio heads where Doppler shifts are problematic, while legacy UEs are scheduled only in zones near radio heads. This localized adaptation of scheduling policies resolves the contradiction by matching resource allocation to actual UE capabilities and environmental conditions.
Solution Approach 2:
The patent segments the coverage area into different zones based on proximity to radio heads and segments UE population into advanced and legacy categories. By creating these segments, the system can apply differentiated scheduling rules: advanced UEs can operate across all zones while legacy UEs are restricted to favorable zones, thereby maintaining communication reliability for all UEs while optimizing resource allocation efficiency.
2Reliability
If resources are allocated to all UEs regardless of capability, then communication coverage is maintained, but performance deteriorates due to inappropriate resource allocation for legacy UEs in challenging conditions
Solution Approach 1:
The patent implements local quality by applying different resource allocation strategies to different UE groups based on their capabilities. Advanced UEs receive resources across all zones including areas between radio heads, while legacy UEs receive resources only in zones near radio heads where signal conditions are favorable. This resolves the contradiction by ensuring appropriate performance optimization for each UE type while maintaining overall communication coverage.
3Adaptability or versatility
If advanced receivers with large bandwidth are deployed, then Doppler shift handling capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the system adaptable to different UE capabilities through dynamic scheduling decisions. Rather than requiring all UEs to have advanced receivers, the system dynamically adjusts resource allocation based on UE capability information and location. This resolves the contradiction by providing Doppler shift handling capability where needed (for advanced UEs) while allowing simpler legacy UEs to operate in favorable conditions, thus reducing overall device complexity requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents resource wastage and enhances data throughput by prioritizing UEs with advanced receivers in poor conditions, ensuring better communication performance for both legacy and advanced receivers in high-speed scenarios.
Implementation Method 1
the signals from the two radio heads will have Doppler shifts with opposite sign of the frequency shift, e.g a train moving with 350 km/h and the UE is connected to a base station with a radio signal with carrier frequency 2.7 GHz the Doppler shift of the signal received from the radio head in front of you has Doppler shift 870 Hz while the signal from the radio head the train is leaving has Doppler frequency −870 Hz
Data Source
AI summary
A network node for a wireless communication network is disclosed. The network node is adapted for scheduling for communication one or more terminals, the terminals being in a moving vehicle, based on location information and/or capability information pertaining to the one or more terminals. The disclosure also pertains to related methods and devices.