Packet control apparatus to connect interconnected network and wireless apparatus

1. A packet control apparatus connected between an interconnected network and a wireless apparatus, said packet control apparatus comprising:

a quality detection means for detecting whether a quality of transmission toward said wireless apparatus is in a predetermined deteriorated state; and

a packet filtering means for deleting a link state watching packet received from said interconnected network when the transmission quality is in said predetermined deteriorated state.

2. The apparatus as claimed in claim 1 , wherein said link state watching packet is a hello packet in Open Shortest Path First route control protocol.

3. The apparatus as claimed in claim 1 , wherein said packet control apparatus further comprises:

an information packet transmitting means for transmitting a short packet that includes information of an amount of packets received from said wireless apparatus, to said wireless apparatus; and

a comparison means for comparing an amount of packets to be transmitted to said wireless apparatus with the amount of received packets, which information is included in a short packet received from said wireless apparatus, and for outputting a message representing the deteriorated state to said quality detecting means.

4. The apparatus as claimed in claim 1 , wherein said packet control apparatus further comprises:

a buffer size control means for increasing a size of a transmitting buffer that stores packets to be transmitted to said wireless apparatus, when a message representing the deteriorated state is received from said quality detecting means.

5. The apparatus as claimed in claim 1 , wherein a plurality of wireless apparatuses are provided for a plurality of radio channels connected between said packet control apparatus and an opposite packet control apparatus on another side, and wherein said packet control apparatus further comprises:

a sequence number addition means for adding a sequence number to a packet to be transmitted to the wireless apparatuses, and for simultaneously inputting the packet into a plurality of transmitting buffers corresponding to the respective wireless apparatuses; and

a sequence control means for checking the sequence number of the packet received from the plurality of wireless apparatuses, for arranging a sequence of packets, and for deleting one of duplication packets.

6. The apparatus as claimed in claim 5 , wherein a modulo-N in the sequence number managed by said sequence number addition means and said sequence control means is smaller than a maximum sequence number in protocol.