BeiDou Message Query Packets for Off-Network Message Retrieval
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Solution Overview
Problem
In areas without cellular network or wireless local area network coverage, terminals using the BeiDou satellite communication system cannot efficiently retrieve messages sent by other terminals.
Innovation Solution
A method and apparatus that enables terminals to query and download messages via the BeiDou satellite network by sending a letter download request packet, which includes a message ID field, allowing the satellite network device to deliver the message content through a dedicated protocol architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses cellular network or wireless local area network for message communication, then message delivery efficiency is improved, but message retrieval functionality is lost in areas without network coverage
Solution Approach 1:
The system pre-loads message data from the cellular network onto the terminal device before the terminal enters areas without network coverage. The terminal stores message identifiers and content locally, enabling subsequent message retrieval operations to be performed offline using the pre-acquired data
Solution Approach 2:
The patent introduces a satellite communication system as an intermediary channel between terminals in areas without cellular or Wi-Fi coverage. The satellite system enables bidirectional communication by receiving messages from the cellular network and relaying them to terminals, and also allowing terminals to query and retrieve messages through satellite uplink-downlink communication
2Adaptability or versatility
If the terminal operates in areas without cellular network coverage, then communication independence is improved, but message download capability deteriorates
Solution Approach 1:
The system performs preliminary message acquisition by pre-loading messages from the cellular network onto the terminal before network coverage is lost. The terminal stores message data locally in advance, ensuring that message download capability is maintained even when operating independently in areas without cellular or Wi-Fi coverage
Solution Approach 2:
The terminal device is designed with multi-functionality to operate in both connected and disconnected states. It can function as a normal networked terminal when cellular or Wi-Fi coverage is available, and as an independent offline terminal when coverage is lost, maintaining message retrieval capability through local storage and satellite communication support
Data Source
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AI summary
This application discloses a letter download query method in a BeiDou communication system, a system, and a related apparatus. The method may include: A terminal may send a letter download query request packet to a BeiDou network device, where the letter download query request packet includes a service type field and a message ID field, the service type field indicates a service type of the letter download query request packet, and the message ID field indicates an ID of a letter successfully received by the terminal last time. The terminal receives a letter download query result packet sent by the BeiDou network device, where the letter download query result packet includes an original letter sending time field and a letter content field, the original letter sending time field indicates original sending time of letter content in the letter content field, and the letter content field indicates letter content sent by one or more target terminals to the terminal. In this way, a user may receive, in a BeiDou network, a letter sent by a user in another cellular network.