CDMA Image Transmission via Packet Segmentation
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Solution Overview
Problem
Conventional methods for transmitting images from a camera to wireless terminals via mobile communication networks face challenges such as insufficient memory in terminals, data loss, and transmission errors due to bandwidth limitations and memory constraints, especially when large amounts of data are transmitted.
Innovation Solution
An image transmission apparatus and method that converts and compresses image signals into small packet units, allowing transmission over a CDMA network, with error checking and retransmission of specific packets to ensure stable and efficient delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If image data is transmitted as large blocks, then transmission speed is improved, but data loss and transmission errors increase due to bandwidth limitations and memory constraints
Solution Approach 1:
The patent divides image data into multiple small packets (e.g., 100-byte packets) before transmission. Each packet is independently numbered and transmitted through the CDMA network. This segmentation allows the system to maintain high transmission speed while improving reliability, as individual packet errors do not corrupt the entire image data and can be selectively retransmitted.
2Quantity of substance
If terminal memory capacity is increased to handle large image data, then image reception quality is improved, but device complexity and cost increase
Solution Approach 1:
By segmenting image data into small packets that fit within the limited memory capacity of portable terminals, the patent enables reliable image reception without requiring increased terminal memory. The terminal only needs to buffer small packets temporarily for assembly, greatly reducing memory requirements and device complexity.
Solution Approach 2:
The transmitting side performs preliminary segmentation and numbering of image data packets before transmission. This preliminary organization allows the receiving terminal to efficiently assemble the complete image without requiring large memory capacity, as packets can be processed and assembled in a structured manner.
3Reliability
If error checking and retransmission protocols are implemented, then transmission reliability is improved, but transmission time and complexity increase
Solution Approach 1:
The patent implements error checking and retransmission at the packet level rather than at the entire image level. Each small packet includes error detection codes and sequence numbers, allowing the receiver to identify and request retransmission of only specific erroneous packets. This approach maintains high reliability while minimizing the time penalty, as only small portions of data need retransmission rather than the entire image.
Data Source
AI summary
An image transmission apparatus and method using a CDMA communication network are disclosed. The apparatus for transmitting an image captured by a camera to a wireless terminal of a user by means of a mobile communication network, includes an image input unit for receiving an image signal from outside, an image conversion unit for converting an image outputted from the image input unit into a form receivable by the wireless terminal, and a wireless data transmission/reception unit for receiving an image request signal, restructuring the signal outputted from the image conversion unit into a small packet unit and transmitting the packet to the terminal of the user. By transmitting the image data in small packet units instead of transmitting it at once, the image data can be transmitted even with a CDMA wireless modem of a small capacity.