Beam Selection via Preamble Signaling for Wake-Up Latency
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Solution Overview
Problem
In network energy saving technologies, waking up closed base stations requires efficient beam connection establishment between the woken-up base station and user equipment (UE), which is not adequately addressed in existing methods.
Innovation Solution
UE sends N preambles to a to-be-woken-up cell, determines a first beam based on associated information, and transmits data on that beam to establish a connection, while the network side device receives and processes these preambles to determine the beam for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the base station is woken up from energy saving mode, then network energy consumption is reduced, but beam connection establishment between the woken-up base station and UE becomes complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by having the UE send wake-up signals and perform beam selection procedures before the base station fully wakes up and becomes operational. The UE sends N preambles to the to-be-woken-up cell, and the network side device determines the beam in advance, so that when the base station wakes up, the beam connection is already established, avoiding complex real-time beam selection after wake-up.
2Loss of energy
If the base station is woken up from energy saving mode, then network energy consumption is reduced, but the time required for beam connection establishment increases
Solution Approach 1:
The patent implements preliminary action by performing beam selection and wake-up signal transmission before the base station fully operates. The UE sends N preambles to the to-be-woken-up cell, and the network side device determines the beam in advance, so that when the base station wakes up, the beam connection is already established, avoiding complex real-time beam selection after wake-up.
Solution Approach 2:
The patent uses copying by having the UE send multiple preambles (N preambles) to the to-be-woken-up cell, where each preamble is associated with a specific beam. This allows the network side device to copy and store the beam information from the preambles, enabling quick beam selection without real-time measurement when the base station wakes up.
3Measurement precision
If multiple preambles are sent to the to-be-woken-up cell, then beam selection accuracy is improved, but the signal processing complexity at the network side increases
Solution Approach 1:
The patent applies segmentation by dividing the beam selection process into discrete segments: the UE sends N separate preambles, each associated with a specific beam, and the network side device processes each preamble independently to determine the corresponding beam. This segmented approach improves beam selection accuracy while keeping the processing complexity manageable through systematic handling of each preamble.
Data Source
AI summary
This application provides a beam selection method, a terminal, and a network side device. The beam selection method includes: a User equipment (UE) sends one or more preambles to a first cell when the first cell is a to-be-woken-up cell, the UE determines a first beam based on first information, and the UE transmits data on the first beam. The first cell is different from a serving cell of the UE. The first information is related to the one or more preambles.