Communication system for improving data transmission efficiency of TCP in wireless network environment and a method thereof

A communication method in which a router connected to a source node and at least one mobile node receives data packets from the source node and transmits the data packets to the at least one mobile node, comprising:

• receiving response signals to the data packets from the at least one mobile node;
• adjusting window field values in the response signals;
• transmitting the response signals of the adjusted window field values to the source node;
• and
• sequentially transmitting the data packets on the basis of the adjusted window field values.

A communication method, comprising:

• sequentially transmitting data packets from a source node to a router;
• storing the data packets received from the source node in a storage area of a buffer of the router;
• transmitting the data packets stored in the buffer to a mobile node via a wireless link in a specified order and at specified intervals while copying and storing the data packets transmitted to the mobile node in the buffer;
• determining whether a response packet is received from the mobile node within a specified time after the data packets are transmitted to the mobile node;
• retransmitting the copied data packets stored in the buffer when the response packet is not received within the specified period of time;
• deleting the copied data packets when the response packet is received within the specified time;
• determining the capacity of the wireless link;
• determining a window field value based on the capacity of the wireless link;
• transmitting the response packet of the adjusted window field value to the source node;
• and
• transmitting subsequent sequential data packets from the source node to the router based on the window field value of the received response packet.

A method of lessening network congestion between a source node and a mobile node through a wireless link provided by a router and having an asymmetrical bandwidth environment, comprising:

• determining the capacity of the wireless link;
• adjusting a window field value based on the capacity of the wireless link;
• transmitting the response packet of the adjusted window field value to a source node;
• and
• transmitting sequential data packets from the source node to the router based on the window field value.