Base Station Beam Direction Group for RACH Reception
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Solution Overview
Problem
Existing beam forming technologies in wireless communication systems face challenges in reliably establishing initial connections and handovers due to the potential misalignment of beam directions, leading to failed RACH signal receptions when terminals move within the service area.
Innovation Solution
The method involves setting a beam direction group for RACH signal reception that includes an additional outer beam direction beyond the original beam directions used for notification signal transmission, ensuring reliable signal reception even if the terminal has moved out of the initial beam coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam forming is used to transmit signals in specific directions, then transmission reliability and distance are improved, but the service area coverage becomes limited to beam directions only
Solution Approach 1:
The service area is segmented into multiple beam directions, each covered by a separate beam. The base station transmits notification signals through multiple beams simultaneously to cover different spatial regions, ensuring that the entire service area is covered while maintaining the reliability benefits of beam forming in each direction.
Solution Approach 2:
The patent extends the beam coverage from a single directional dimension to multiple dimensional beam directions. By forming beams in multiple directions simultaneously and coordinating their timing, the system achieves three-dimensional spatial coverage while maintaining directional transmission reliability.
2Area of stationary object
If the beam direction is switched to cover the entire service area, then service area coverage is improved, but the timing alignment between notification signal transmission and RACH signal reception becomes difficult
Solution Approach 1:
The base station pre-configures multiple beams with different transmission timings before actual communication begins. Each beam's transmission timing is calculated in advance based on its direction and the expected terminal positions, so that when terminals transmit RACH signals, the base station can receive them simultaneously from all directions without real-time beam switching delays.
Solution Approach 2:
The patent employs periodic beam transmission cycles where notification signals are transmitted alternately through different beams in a predetermined sequence. This periodic structure allows the base station to predict which beam will be active at any given time, enabling precise timing synchronization for RACH signal reception from multiple directions.
3Ease of operation
If the terminal transmits RACH signal after a lapse of time from receiving notification signal, then the terminal can process the notification information, but the terminal may have moved out of the original beam direction coverage
Solution Approach 1:
The base station transmits notification signals through multiple overlapping beams that cover not only the current terminal position but also potential future positions where the terminal may move during the processing time. This creates a spatial buffer or cushion that ensures the terminal remains within beam coverage even after movement, preventing RACH signal loss.
Solution Approach 2:
Each notification signal beam is designed to serve multiple functions: it covers the current terminal position, anticipates terminal movement, and provides timing reference for RACH transmission. The multi-functional beams eliminate the need for separate positioning and communication beams, ensuring reliable RACH reception despite terminal movement during processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the reliability of initial connections and handovers by preventing RACH signal loss due to terminal movement, maintaining communication quality across the service area.
Implementation Method 1
the base station sends a signal by forming a beam (beam forming) only in the direction of the communication destination terminal with the use of a plurality of antennas
Implementation Method 2
by giving wireless signal reception directivity to a reception antenna of a base station, the influence of interference waves arriving from other directions than the direction of the reception directivity can be prevented or reduced
Data Source
AI summary
Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station are configured to use a beam to communicate to and from each other. The beam transmission/reception method includes a first step of setting, by the base station, when receiving a random access signal transmitted by the terminal as a connection request, a beam direction group at a time of reception of the random access signal by adding a further outer beam direction to beam directions used at a time of transmission of a notification signal for measuring a signal before the reception.