Uplink Reference Signal Beam Selection for 5G Mobility
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Solution Overview
Problem
Current wireless communication systems, particularly in new radio (NR) and 5G technologies, face challenges in improving handover reliability, reducing handover frequency, and enhancing power efficiency during uplink-based and downlink-based mobility scenarios, as they rely heavily on measurements that may not efficiently utilize user equipment (UE) feedback for beam selection and handover decisions.
Innovation Solution
The proposed solution involves a method and apparatus where user equipment (UE) transmits an uplink reference signal with an indication of a preferred downlink beam, allowing base stations (BS) to make handover and beam selection decisions based on these measurements, enabling more user-centric network operations and reducing the need for frequent handovers by optimizing beamforming and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink measurements are used for handover decisions, then handover reliability can be improved, but handover frequency increases and power efficiency deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where UEs provide measurement reports and beam preference indications to the network. The network uses this feedback to make informed handover decisions, balancing reliability improvements with power efficiency by avoiding unnecessary handovers.
Solution Approach 2:
The patent changes the measurement parameters from traditional downlink signal strength to uplink-based measurements and beam preference indications. This parameter change enables more accurate handover decisions that improve reliability while reducing unnecessary handovers and power consumption.
2Reliability
If traditional measurement methods are used for beam selection, then system complexity remains low, but handover reliability deteriorates
Solution Approach 1:
The patent introduces an intermediary uplink reference signal as a mediator between the UE and network for handover decisions. This intermediary enables more reliable measurements without requiring complex bidirectional measurement systems, thus improving reliability while controlling system complexity.
3Reliability
If frequent handovers are performed to maintain connection quality, then communication reliability improves, but power efficiency and network performance deteriorate
Solution Approach 1:
The patent performs preliminary beam selection and handover preparation using uplink measurements before actual handover execution. This preliminary action ensures that handovers are performed only when necessary and with proper preparation, maintaining connection quality while avoiding unnecessary handovers that would degrade network performance.
Data Source
AI summary
Aspects of the present disclosure provide methods and apparatus for beam selection in uplink-based and downlink-based mobility scenarios, for example, for new radio (NR) systems which can improve handover reliability, reduce handover frequency, and improve power efficiency. Certain aspects provide a method for wireless communications by a user equipment (UE). The method generally includes transmitting an uplink reference signal with an indication of a preferred downlink beam and receiving a downlink transmission based, at least in part, on the uplink reference signal.