Beam Indication Set Preconfiguration for 5G UE Mobility
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently managing beam indication sets due to frequent updates when user equipment (UE) is in motion, leading to increased latency and overhead in signaling active beams.
Innovation Solution
The system determines and configures a predetermined set of beam indication sets based on time and movement parameters, preconfiguring the UE with associations of beam indication subsets for specific time or location intervals, reducing the need for frequent signaling and dynamic beam training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent dynamic beam updates are performed to track UE movement, then communication reliability is improved, but latency and signaling overhead increase
Solution Approach 1:
The system preconfigures multiple beam indication sets corresponding to different time intervals or UE movement states before actual beam switching is needed. When UE movement is detected or time interval expires, the preconfigured beam indication set can be immediately activated without requiring real-time beam training, thus reducing latency while maintaining communication reliability.
2Reliability
If frequent dynamic beam updates are performed to track UE movement, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
Multiple beam indication sets are preconfigured and stored in the UE before movement occurs. Each beam indication set corresponds to a specific time interval or movement state. When the UE moves or time expires, the network can simply indicate which preconfigured set to use rather than transmitting complete beam training sequences, significantly reducing signaling overhead while maintaining reliability.
Solution Approach 2:
The beam indication configuration is segmented into multiple discrete sets, each optimized for specific time intervals or movement conditions. This segmentation allows the system to select the appropriate preconfigured set based on current UE state, avoiding the need to transmit and process complete beam training information for every movement event, thus reducing overall signaling overhead.
3Loss of time
If multiple beam indication sets are preconfigured for different time intervals, then latency is reduced by avoiding real-time beam training, but device complexity increases
Solution Approach 1:
The beam indication configuration is divided into multiple discrete, preconfigurable sets corresponding to different time intervals or movement states. Each set is independently configured and stored, making the complexity manageable through modular organization rather than requiring complex real-time beam training algorithms.
Solution Approach 2:
Beam indication sets are configured in advance through RRC signaling or MAC-CE commands, transferring the configuration complexity to initial setup phases rather than real-time operation. During actual beam switching, the UE simply selects from preconfigured sets based on time interval or movement state, reducing real-time processing complexity while achieving low latency.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for beam indication set determination. A method by a user equipment (UE) includes receiving a configuration of multiple beam indication sets. The method includes receiving an indication of parameters and, for each parameter, an associated subset of the multiple beam indication sets. The method includes determining a subset of the multiple configured beam indication sets based on the one or more parameters. The beam indications may be transmission configuration indicator (TCI) states for downlink transmissions and/or spatial relations for uplink transmissions. The base station (BS) can configure multiple beam indications and sets and signal to the UE which sets are configured or active during which intervals. The BS may signal the association based on a predetermined UE trace.