Elevator Service Request Broadcasting for Limited Channel Capacity

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Solution Overview

Problem

Elevator systems face challenges in managing multiple passenger requests efficiently due to limited channel capacity in wireless signal devices, leading to 'traffic congestion' and increased workload, particularly with Bluetooth modules handling numerous passengers simultaneously.

Innovation Solution

A wireless signal device and communication method that dynamically updates and broadcasts elevator service request command data packets, allowing passengers to scan and identify responded commands without establishing connections, reducing the need for redundant requests and optimizing channel capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a wireless signal device establishes individual wireless connections with multiple personal mobile terminals to process elevator service requests, then the elevator service request function can be implemented for each passenger, but the channel capacity becomes insufficient and traffic congestion occurs

Engineering Contradiction:

Improveelevator service request functionVSAvoidchannel capacity

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent combines multiple elevator service request commands from different passengers into a single broadcast data packet. Instead of establishing separate wireless connections for each passenger, the system merges all service requests into one consolidated data structure that can be broadcast to multiple terminals simultaneously, thereby reducing the number of connection channels required.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses broadcast transmission where the merged service request data packet is copied and transmitted to multiple personal mobile terminals simultaneously. Each terminal receives a copy of the same data packet containing all service requests, eliminating the need for individual dedicated communication channels for each passenger.

Inventive Principle:

Principle #26Copying

2Adaptability or versatility

If the wireless signal device processes all elevator service request commands from multiple passengers, then complete service coverage is achieved, but the workload on the wireless signal device increases significantly

Engineering Contradiction:

Improveservice coverageVSAvoidprocessing workload

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent extracts and removes service request commands from the broadcast data packet after they have been successfully processed. When the elevator controller executes a service request command, that specific command is removed from the data packet, reducing the workload for subsequent processing cycles and preventing redundant processing of already fulfilled requests.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent discards processed service request commands from the active data packet after execution. By removing fulfilled commands from the broadcast data packet, the system recovers processing resources and reduces the workload for future broadcast cycles, maintaining efficient operation while preserving complete service coverage.

Inventive Principle:

Principle #34Discarding and recovering

3Reliability

If the wireless signal device maintains continuous wireless connections with multiple personal mobile terminals, then real-time communication is achieved, but the limited channel capacity causes traffic congestion

Engineering Contradiction:

Improvereal-time communicationVSAvoidtraffic congestion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements periodic broadcast transmission instead of continuous individual connections. The wireless signal device periodically transmits the merged service request data packet to all personal mobile terminals in the system, maintaining real-time communication capability while avoiding the traffic congestion that would result from maintaining simultaneous continuous connections with multiple terminals.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP3620417B1Communication for elevator service request

Publication Date: 2026.04.01 OTIS ELEVATOR CO

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AI summary

The present invention relates to communication for an elevator service request and belongs to the field of elevator technologies. A wireless signal device for broadcasting a wireless signal according to the present invention is capable of communicating with an elevator controller of an elevator system, establishing a wireless connection with a personal mobile terminal based on the wireless signal, receiving an elevator service request command from the personal mobile terminal, and sending the received elevator service request command to the elevator controller for elevator service control. The wireless signal device comprises: an elevator service request command responding unit configured to generate an elevator service request command data packet that has been responded to according to the elevator service request command that has been received; and a broadcasting unit configured to broadcast the elevator service request command data packet that has been responded to. The demand for a connection channel capacity of the wireless signal device is reduced in the present invention, and the problem of "traffic congestion" between the personal mobile terminal and the wireless signal device will not occur easily.