Restricted Receive Beam Sweeping for High-Speed Wireless Devices
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Solution Overview
Problem
In high-speed wireless communication scenarios, such as those on high-speed trains, existing systems face delays in radio resource management (RRM) due to the need for extensive receive beam sweeping, which can lead to call drops and poor system performance.
Innovation Solution
Providing assistance information to wireless devices to restrict the number of receive beams and their sequence, allowing them to perform more focused and rapid RRM operations based on known network layouts, train trajectories, and vehicle speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive receive beam sweeping is performed for RRM measurements, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The network node performs preliminary actions by determining the direction of arrival of synchronization signals and pre-calculating the optimal receive beam set for the UE. This preliminary information is provided to the UE before RRM measurements, allowing the UE to skip extensive beam sweeping and directly use the predetermined optimal beams, thus reducing measurement time while maintaining accuracy
Solution Approach 2:
The network node acts as an intermediary by providing assistance information about the optimal receive beam set to the UE. This intermediary provides the UE with pre-determined beam information, eliminating the need for the UE to perform exhaustive beam sweeping, thereby resolving the contradiction between measurement accuracy and time consumption
2Reliability
If full receive beam sweeping is performed, then reliability of RRM measurements is improved, but system performance deteriorates due to delays
Solution Approach 1:
The network node determines the direction of arrival and pre-determines the optimal receive beam set before the UE performs RRM measurements. This preliminary action ensures measurement reliability is maintained while reducing the time required, thus preventing system performance deterioration due to delays
Solution Approach 2:
The invention changes the parameter of receive beam selection from exhaustive sweeping to a predetermined subset based on direction of arrival information. This parameter change maintains measurement reliability by using optimal beams while significantly reducing measurement time, thereby improving system performance
3Adaptability or versatility
If receive beam sweeping is performed without assistance information, then comprehensive measurement coverage is achieved, but measurement delays increase leading to call drops
Solution Approach 1:
The network node performs preliminary determination of the direction of arrival and pre-determines the optimal receive beam set before the UE conducts measurements. This preliminary action provides the UE with targeted beam information, maintaining comprehensive measurement coverage while eliminating unnecessary beam sweeping delays that could cause call drops
Solution Approach 2:
The network node serves as an intermediary by providing assistance information containing the optimal receive beam set to the UE. This intermediary role ensures the UE has access to comprehensive measurement coverage through pre-determined beams without experiencing the delays associated with exhaustive beam sweeping
Data Source
AI summary
A method (1200) by a wireless device (110) operable to perform receive beam sweeping over a set of a plurality of receive beams includes receiving (1202), from a network node, assistance information. The wireless device determines (1204), based on the assistance information, a first subset of receive beams within the set of the plurality of receive beams. The wireless device performs (1206) at least one operation based on the first subset of receive beams.