P2P Multicast Retransmission for Mobile Data Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication, especially between mobile devices, existing methods require infrastructure like access points, leading to increased latency and power consumption, and multicast communication lacks data retransmission mechanisms, resulting in potential data loss during transmission to multiple recipients.
Innovation Solution
A communication apparatus and method that utilizes Peer-to-Peer (P2P) communication with multicast groups, where data is transmitted in chunks or sectors, and a retransmission process is implemented using repair messages to ensure data integrity across multiple recipients without the need for infrastructure, optimizing power usage and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If P2P communication is used without infrastructure, then latency is reduced and power consumption is lowered, but data loss may occur due to lack of retransmission mechanism
Solution Approach 1:
The patent segments data into multiple packets with sequential numbering, enabling individual packet tracking and retransmission. Each packet is divided into fixed-size units with headers containing sequence numbers, allowing the receiver to identify missing packets and request retransmission without retransmitting entire data sets.
Solution Approach 2:
The patent implements a feedback mechanism where receivers send acknowledgments for received packets and request retransmission of missing packets. The transmitter uses this feedback to determine which packets need retransmission, creating a closed-loop system that ensures data integrity while maintaining efficient P2P communication.
2Use of energy by moving object
If multicast is used to transmit data to multiple terminals simultaneously, then power consumption is reduced, but data loss may occur without delivery confirmation
Solution Approach 1:
The patent implements acknowledgment feedback where each receiver sends confirmation for received packets. The transmitter monitors these acknowledgments to determine which packets were successfully delivered to which receivers, enabling targeted retransmission only to those who missed packets, thus maintaining low power consumption while ensuring reliability.
Solution Approach 2:
By segmenting data into numbered packets, the system can track delivery status individually for each packet to each receiver. This allows selective retransmission of only missing packets to specific receivers rather than retransmitting all data to all receivers, optimizing power usage while ensuring data integrity.
3Reliability
If individual unicast transmission is used to each terminal, then data integrity is ensured through confirmation, but power consumption increases and transmission time is extended
Solution Approach 1:
The patent merges multiple unicast transmissions into a single multicast transmission by sending the same data packets to multiple receivers simultaneously. Each receiver processes the packets independently and sends individual acknowledgments, combining the reliability of unicast with the efficiency of multicast, thereby reducing overall power consumption while maintaining data integrity.
Solution Approach 2:
Segmentation enables the system to track which specific packets were received by which specific receivers, allowing for efficient selective retransmission. This granularity allows the system to avoid redundant retransmissions to receivers who already have the data, optimizing power consumption while ensuring each receiver gets complete data.
4Productivity
If multicast transmission is used without retransmission mechanism, then communication speed is improved, but data loss occurs in reception terminals
Solution Approach 1:
The patent segments data into numbered packets that can be independently tracked and retransmitted. This segmentation allows the system to maintain high communication speed by using efficient multicast for initial transmission while enabling targeted retransmission of only missing packets, preventing data loss without sacrificing overall communication efficiency.
Solution Approach 2:
The feedback mechanism allows receivers to promptly report missing packets, enabling the transmitter to quickly retransmit only the necessary data. This minimizes the impact on communication speed while ensuring complete data delivery, as retransmission occurs only for specific missing packets rather than requiring complete data retransmission.
Data Source
AI summary
According to the embodiments, a communication apparatus stores therein an operation mode indicating whether the communication apparatus is a publisher or a subscriber, and includes a message processing unit that generates a transmission message and analyzes a reception message and a nonvolatile memory. When the communication apparatus is subscriber, the communication apparatus sends a repair message to request a retransmission of a data chunk not successively received. When the communication apparatus is publisher, the communication apparatus selectively retransmits the data chunk based on the repair message.