Base Station Beam Controller for DRX Synchronization
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Solution Overview
Problem
In fifth-generation mobile communication systems using high-frequency millimeter waves, base stations face challenges in identifying the position of mobile stations performing discontinuous reception (DRX) control, leading to synchronization issues when downlink data needs to be transmitted, as the timing of signal transmission from these stations is irregular, making it difficult to direct directional beams effectively.
Innovation Solution
A base station equipped with an assignor to assign preambles, a start request signal generator to create signals requesting synchronization, and a beam controller to switch directional beam directions during reception periods, allowing for non-contention synchronization processes with mobile stations performing DRX control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beam sweep is performed to identify mobile station position, then the base station can direct directional beams accurately, but the synchronization process time increases due to irregular transmission timing from DRX control mobile stations
Solution Approach 1:
The base station performs a downlink beam sweep to transmit synchronization signals and identify the mobile station's position in advance, before the mobile station actually needs to transmit data. This preliminary position identification allows the base station to pre-configure the uplink reception beam direction, so when the mobile station transmits during its DRX window, the base station is already ready to receive, eliminating the need for time-consuming beam sweeping at that moment.
2Adaptability or versatility
If the base station performs beam sweep for each synchronization request, then it can maintain communication with moving mobile stations, but the device complexity and processing overhead increase
Solution Approach 1:
The synchronization process is divided into two separate phases: downlink beam sweep for position identification, and uplink beam reception for data transmission. By segmenting the beam management into these distinct phases, the base station can perform comprehensive scanning when needed (downlink) and then maintain simpler operation during data transmission (uplink), reducing overall processing complexity while maintaining adaptability to mobile station movement.
Data Source
AI summary
A base station that communicates with a mobile station that intermittently performs a receiving operation during a cyclic reception period includes: an assignor that assigns a preamble to the mobile station; a start request signal generator that generates a start request signal containing the preamble assigned to the mobile station and requesting the start of a synchronization process between the mobile station and the base station; and a beam controller that transmits start request signals in a plurality of directions within the reception period while switching directions of directional beams for transmitting start request signals, and determines the direction of the directional beam for communicating with the mobile station, in accordance with the direction of the directional beam at the time of reception of the preamble transmitted from the mobile station having received the start request signal.