Packet receiving apparatus and packet transmission method

A packet transmitting apparatus for performing wireless communication with a packet receiving apparatus, said packet transmitting apparatus comprising:

• error detecting means for detecting an error in a received packet that contains a compressed header;
• header decompressing means for decompressing the compressed header;
• storing means for storing the header portion of a correctly received packet;
• and
• means for outputting a packet as a received packet when said detecting means detects no error in the packet, the packet containing a header, a portion of which replaced by the header of a correctly received packet when said error detecting means detects an error, and the replaced header thus replaced when said error detecting means detects an error, and updating a replaced header in said storing means to update.

A packet transmission method comprising:

• periodically transmitting a packet containing a non-compressed header and for transmitting a packet containing a compressed header on the transmitting side;
• detecting errors in a packet containing a non-compressed header and a packet containing a compressed header on the receiving side;
• decompressing the compressed header;
• storing the header portion of a correctly received packet;
• and
• outputting a packet as a received packet when said detecting means detects no error in the packet, the packet containing a header, a portion of which replaced by the header of a correctly received packet when said error detecting means detects an error, and the replaced header thus replaced when said error detecting means detects an error, and updating a replaced header in said storing means to update.

A computer-readable recording medium storing a packet-receiving program, said program comprising:

• an error detecting procedure of detecting errors in a packet containing a non-compressed header and a packet containing a compressed header;
• a header decompressing procedure of decompressing the compressed header;
• a storing procedure of storing the header portion of a correctly received packet;
• and
• a procedure for outputting a packet as a received packet when said detecting means detects no error in the packet, the packet containing a header, a portion of which replaced by the header of a correctly received packet when said error detecting means detects an error, and the replaced header thus replaced when said error detecting means detects an error, and updating a replaced header in said storing means to update.

A packet receiving program operable by a computer, said packet receiving program comprising:

• an error detecting function for detecting errors in a packet containing a non-compressed header and a packet containing a compressed header;
• a header decompressing function for decompressing the compressed header;
• a storing function for storing the header portion of a correctly received packet;
• and
• a function for outputting a packet as a received packet when said detecting means detects no error in the packet, the packet containing a header, a portion of which replaced by the header of a correctly received packet when said error detecting means detects an error, and the replaced header thus replaced when said error detecting means detects an error, and updating a replaced header in said storing means to update.