Base Station Beam Scheduling for 5G Synchronization
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Solution Overview
Problem
Current methods for time-divisionally transmitting control signals in 5G systems using Massive-MIMO technology are inefficient, leading to longer synchronization times and reduced throughput due to unnecessary beam transmissions and resource allocation issues.
Innovation Solution
A base station apparatus and terminal apparatus that utilize historical information to optimize transmission beam directions by adjusting transmission schedules based on the presence of user terminals, eliminating unnecessary beam transmissions and prioritizing sectors with higher terminal presence, thereby reducing waiting times and improving resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If beam forming is performed for transmission of control signal for synchronization, then reachable distance of control signal is extended, but time for user data transmission is reduced
Solution Approach 1:
The base station performs preliminary actions by pre-determining beam directions based on historical terminal presence information before actual control signal transmission. This allows the system to prepare optimal beam directions in advance, reducing the time needed during actual synchronization signaling and thereby increasing time available for user data transmission.
2Ease of operation
If transmission beam direction is adjusted stepwise, then beam width control is simplified, but transmission beam direction cannot always be controlled to be proper direction towards user terminals
Solution Approach 1:
The system employs feedback mechanisms by utilizing historical information on terminal presence in different sectors to continuously refine and adjust beam directions. This feedback loop enables the base station to learn from past transmission patterns and improve beam direction accuracy over time, ensuring beams are directed towards areas where terminals are actually present while maintaining operational simplicity.
3Device complexity
If time-divisional transmission of control signal is performed, then resource allocation is simplified, but waiting time for terminal to receive control signal increases
Solution Approach 1:
The base station performs preliminary actions by pre-determining optimal beam directions based on historical terminal presence information before actual control signal transmission. This allows the system to prepare optimal beam directions in advance, reducing the time needed during actual synchronization signaling and thereby decreasing waiting time for terminals to receive control signals.
4Device complexity
If frequency multiplexing and spatial multiplexing are used to reduce processing load, then processing load is reduced, but more resources are required for control channels
Solution Approach 1:
The invention extracts and utilizes historical terminal presence information as a separate resource to optimize beam direction determination. By taking out this historical data and using it to pre-determine optimal beam directions, the system reduces processing load during actual transmission without requiring additional control channel resources, as the historical information serves as a reusable reference.
Data Source
AI summary
In order to shorten a waiting time until a user terminal receives a down signal transmitted from a base station apparatus and ensure that a transmission beam is transmitted to a direction towards where one or more user terminals are present, a base station for time-divisionally transmitting a down signal to multiple user terminals present in a cell concurrently with changing a transmission beam direction where the down signal is common to the multiple user terminals is provided and includes a wireless communicator configured to time-divisionally transmit the down signal concurrently with changing the transmission beam direction, an information storage configured to store transmission schedule information which specifies transmission timing of the transmission beam, and a controller configured to control, based on the transmission schedule information, the transmission beams when the base station transmits the down signal.