Method and apparatus for compressing frame
Provided is a method and apparatus for efficiently transmitting and receiving a frame including a header and a payload in a communication system. If the number of repeated items in the content of a header of the frame is high, specific preambles are allocated to the repeated items and the repeated items are omitted. Accordingly, data transfer efficiency can be improved.
1. A method of compressing a frame, the method comprising:
monitoring header information of transmitted frames for a predetermined period of time;
after the monitoring,
when there are no repeated items in the header information of the frames transmitted during the predetermined period of time, transmitting a successive frame with all of the header information;
when some items in the header information of the transmitted frames are repeated during the predetermined period of time, generating specific preambles mapped to the repeated items, generating a compressed header by omitting the repeated items from the header information, and transmitting a successive frame comprising the specific preambles and the compressed header; and
when all items in the header information of the transmitted frames are repeated during the predetermined period of time, transmitting a successive frame without any header information.
2. The method of claim 1 , further comprising transmitting the specific preambles.
3. The method of claim 1 , wherein the repeated items comprise any one of a destination address, a source address, a length, and a type of the frame to be transmitted.
4. The method of claim 1 , wherein the specific preambles vary according to the repeated items, and different specific preambles are orthogonal to each other.
5. An apparatus for compressing a frame, the apparatus comprising:
a header analyzing unit monitoring header information of transmitted frames for a predetermined period of time and extracting repeated items from the header information;
a specific preamble generating unit generating specific preambles mapped to the repeated items when some items in the header information of the transmitted frames are repeated during the predetermined period of time;
a header generating unit generating a compressed header by omitting the repeated items from the header information; and
a frame generating unit generating a successive frame, the successive frame being a frame with all of the header information when there are no repeated items in the header information of the frames transmitted during the predetermined period of time, a frame comprising the specific preambles and the compressed header when some items in the header information of the transmitted frames are repeated during the predetermined period of time, and a frame without any header information when all items in the header information of the transmitted frames are repeated during the predetermined period of time.
6. The apparatus of claim 5 , further comprising a payload generating unit mapping a data stream, which is to be transmitted, to a payload.
7. The apparatus of claim 5 , wherein the repeated items comprise any one of a destination address, a source address, a length, and a type of the frame to be transmitted.
8. The apparatus of claim 5 , wherein the specific preambles generated by the specific preamble generating unit vary according to the repeated items, and different specific preambles are orthogonal to each other.
9. The apparatus of claim 5 , further comprising a transmitting unit transmitting the specific preambles generated by the specific preamble generating unit.
10. An apparatus for compressing a frame, the apparatus comprising:
a transmitter generating and transmitting a frame comprising a compressed header, which is obtained by omitting repeated items from header information, and specific preambles mapped to the repeated items; and
a receiver receiving the frame, and transmitting a specific preamble-compressed header mapping response message,
wherein the specific preambles vary according to the repeated items, and different specific preambles are orthogonal to each other.
11. The apparatus of claim 10 , wherein the receiving unit maps the specific preambles to the repeated items.
12. The apparatus of claim 10 , further comprising a control unit retrieving the specific preambles after the frame and the specific preamble-compressed header mapping response message are communicated between the transmitting unit and the receiving unit.
13. The apparatus of claim 10 , wherein the repeated items comprise at least one selected from the group consisting of a destination address, a source address, a length, and a type of the frame.