Mobile Terminal Message Segment Reassembly
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Solution Overview
Problem
In GSM/EDGE mobile networks, there is a risk that mobile terminals may incorrectly reassemble primary notification messages during emergency events like earthquakes or tsunamis due to receiving message segments out of order, leading to invalid warnings if segments from different messages are combined.
Innovation Solution
A message identifier, such as a single bit that toggles with each new message, is added to each segment of the primary notification message to ensure that only segments belonging to the same message are reassembled, preventing errors and allowing the mobile terminal to determine when a new message has been sent, thus avoiding repeated acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If primary notification messages are segmented and transmitted in separate paging messages, then the message can be delivered to mobile terminals in idle mode, but mobile terminals may receive segments out of order and incorrectly reassemble them from different messages
Solution Approach 1:
The patent applies segmentation by dividing the primary notification message into multiple segments (first segment, second segment, etc.) that can be transmitted separately in different paging messages. Each segment is independently transmitted to mobile terminals, enabling efficient delivery to idle mode devices while maintaining the ability to reassemble the complete message.
Solution Approach 2:
The patent implements feedback through the message identifier field that provides information about message identity to the mobile terminal. The terminal uses this identifier to verify whether received segments belong to the same message, enabling it to feedback control the reassembly process and prevent incorrect combination of segments from different messages.
2Reliability
If a message identifier is added to each message segment, then correct reassembly is ensured, but the message size and processing complexity increase
Solution Approach 1:
The patent applies local quality by adding the message identifier specifically to the header portion of each message segment rather than distributing it throughout the entire message. This localized placement allows the identifier to perform its discrimination function at the point of reception without requiring processing of the entire message content, thereby minimizing added complexity.
Solution Approach 2:
The patent changes the parameter of message segment structure by introducing an additional field (message identifier) that toggles between different values for different messages. This parameter change enables the terminal to distinguish between messages using a simple binary or multi-valued field, achieving reliable segmentation tracking with minimal increase in message overhead.
Data Source
AI summary
The transmission of a warning message to a mobile terminal in a mobile communication network is triggered by an emergency event. The mobile terminal is first made aware of the need to receive a warning message by reception of an emergency event notification. The warning message is divided into a plurality of message segments. Each segment is transmitted in a separate paging message over a paging channel to mobile terminals in an idle mode. Information is added to each message segment to enable the mobile terminal to discriminate between segments belonging to different warning messages.