Header compression and packet transmission method in sensor network and apparatus therefor

A header compression and packet transmission apparatus in a sensor network, the apparatus comprising:

• an inquiry message transmission unit to transmit an inquiry message to a sensor node in the sensor network inquiring whether the sensor node supports an adaptation layer function to perform compression of an Internet Protocol (IP) header, wherein the inquiry message transmission unit determines a value from among reserved values in a command type field of an IEEE 802.15.4 MAC (Media Access Control) frame designated as an adaptation layer capability request type, and sets the value corresponding to the adaptation layer capability request type in a command type field of an IEEE 802.15.4 MAC frame in the inquiry message;
• a reply message reception unit to receive a reply message corresponding to the inquiry message and which is transmitted from the sensor node by using a function of a lower layer used by the sensor node;
• a determination unit to analyze the received reply message and to determine whether the sensor node supports the adaptation layer function to perform compression of an IP header;
• a header compression unit to compress an IP header in a packet when the determination unit determines that the sensor node supports the adaptation layer function to perform compression of an IP header, and does not compress an IP header in a packet when the determination unit determines that the sensor node does not support the adaptation layer function;
• and
• a packet transmission unit to transmit the packet to the sensor node,
• wherein if the sensor node does not support the adaptation layer function, the packet transmission unit fragments the packet into a plurality of packets, and then transmits the plurality of packets to the sensor node without compressing the IP header.

A non-transitory computer readable recording medium having recorded thereon a program to execute a header compression and packet transmission method in a sensor network, the header compression and packet transmission method comprising:

• transmitting an inquiry message to a sensor node in the sensor network inquiring whether the sensor node supports an adaptation layer function to perform compression of an Internet Protocol (IP) header, wherein the transmitting of the inquiry message comprises:
• determining a value from among reserved values in a command type field of an IEEE 802.15.4 MAC (Media Access Control) frame designated as an adaptation layer capability request type;
• and
• setting the value corresponding to the adaptation layer capability request type in a command type field of an IEEE 802.15.4 MAC frame comprised in the inquiry message;
• receiving a reply message corresponding to the inquiry message transmitted from the sensor node using a function of a lower layer used by the sensor node;
• analyzing the reply message and determining whether the sensor node supports the adaptation layer function to perform compression of an IP header according to the analyzed reply message;
• compressing an IP header and transmitting a packet with the compressed IP header to the sensor node when it is determined that the sensor node supports the adaptation layer function to perform compression of an IP header;
• and
• transmitting a packet to the sensor node without compressing the IP header when it is determined that the sensor node does not support the adaptation layer function,
• wherein if the sensor node does not support the adaptation layer function, the transmitting the packet to the sensor node comprises fragmenting the packet into a plurality of packets and then transmitting the plurality of packets to the sensor node without compressing the IP header.

A mobile device in a sensor network, including a header compression and packet transmission apparatus, the apparatus comprising:

• an inquiry message transmission unit to transmit an inquiry message to another sensor node in the network to determine whether the sensor node supports an adaptation layer function to perform compression of an Internet Protocol (IP) header, wherein the inquiry message transmission unit selects a value from among reserved values in a command type field of an IEEE 802.15.4 MAC (Media Access Control) frame designated as an adaptation layer capability request type, and sets the value corresponding to the adaptation layer capability request type in a command type field of an IEEE 802.15.4 MAC frame in the inquiry message;
• a header compression unit to selectively compress at least a portion of a packet when the sensor node is determined to support the adaptation layer function to perform compression of an IP header;
• and
• a packet transmission unit to transmit the packet to the sensor node;
• wherein the packet includes the compressed portion if the sensor node supports the adaptation layer function to perform compression of an IP header, and
• if the sensor node does not support the adaptation layer function, the packet transmission unit fragments the packet into a plurality of packets, and then transmits the plurality of packets to the sensor node without compressing the IP header.

A method of compressing data and communicating with a sensor node in a sensor network, the method comprising:

• receiving a message inquiring whether the sensor node supports an adaptation layer function to perform compression of an Internet Protocol (IP) header;
• transmitting a reply message indicating whether the sensor node supports an adaptation layer function to perform compression of an IP header, wherein the transmitting the reply message comprises:
• setting a value corresponding to an adaptation layer capability acknowledgement type in a command type field of an IEEE 802.15.4 MAC (Media Access Control) frame in the reply message if the sensor node supports an adaptation layer function to perform compression of an IP header, and
• setting a value corresponding to an adaptation layer capability reject type in a command type field of the IEEE 802.15.4 MAC frame in the reply message if the sensor node does not support an adaptation layer function to perform compression of an IP header;
• and
• receiving a packet based on the content of the reply message,
• wherein receiving the packet comprises:
• receiving the packet including at least one compressed portion if the sensor node supports an adaptation layer function to perform compression of an IP header, and
• receiving a plurality of packets, the plurality of packets being fragments of the packet which is fragmented into a plurality of packets without compressing the IP header, if the sensor node does not support the adaptation layer function to perform compression of an IP header.

A device in a sensor network, the device comprising:

• an inquiry message reception unit to receive an inquiry message inquiring whether the mobile device supports an adaptation layer function to perform compression of an Internet Protocol (IP) header;
• a reply message transmission unit to transmit a reply message indicating whether the sensor node supports the adaptation layer function to perform compression of an IP header;
• and
• a packet reception unit to receive a packet based on the reply message, the packet including at least one compressed portion if the mobile device supports the adaptation layer function to perform compression of an IP header,
• wherein, if the mobile device supports the adaptation layer function to perform compression of an IP header, the reply message transmission unit sets a value corresponding to an adaptation layer capability acknowledgement type in a command type field of an IEEE 802.15.4 MAC (Media Access Control) frame in the reply message, and
• if the sensor node does not support the adaptation layer function, the packet the packet reception unit is to receive is fragmented into a plurality of packets without compressing the IP header, and the packet reception unit receives the plurality of packets.