Satellite communication data delivery method and slave and master stations using the method

• US 20010048672A1
• Filed: 05/21/2001
• Published: 12/06/2001
• Est. Priority Date: 06/01/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kasai, Norimitsu, Okunishi, Masako, Okumoto, Tomoko
• Granted Patent: US 7,079,505 B2
• Time in Patent Office: Days
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18582 Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
• CPC Class Codes: H04H 20/74 of satellite networks

Abstract

In a satellite communication data delivery method, delivery data is transmitted from a master station to a slave station over a packet exchanging system communication channel 3 via a satellite. The slave station demodulates the packet ID appended to a packet delivered. In case the packet ID is the same as the packet ID owned by the slave station, the slave station receives the data in the packet. The slave station transmits an assignment request signal for the dedicated communication channel 4 over the uplink of the control channels 5. The master station assigns an idle dedicated communication channel out of the dedicated communication channels 4 to the slave station and notifies the slave station of the assignment over the downlink of the control circuits 5. The slave station transmits response data to the master station over the assigned dedicated communication channel.

Claims

1. A satellite communication data delivery method in which data is delivered from a master station to a plurality of slave stations via a satellite, said method comprising the steps of:

at said master station, transmitting delivery data to slave stations over a packet exchanging system communication channel via a satellite; and

at said slave stations, receiving delivery data by having a packet identifier same as that appended to said delivery data and request assignment of dedicated communication channels from said master station over a control channel via a satellite during or on completion of the reception of said data, and transmitting response data to the master station over dedicated communication channels assigned to the slave stations.

5. A satellite communication data delivery method according to

claim 1

, wherein said master station transmits digital video data to said slave stations over a packet exchanging system communication channel.

6. A satellite communication data delivery method according to

claim 1

, wherein said slave station transmits response data to notify the master station that the data delivered by said master station has been successfully received.

7. A satellite communication data delivery method according to

claim 1

, wherein said master station transmits a channel assignment signal for a dedicated communication channel to be assigned to said slave station, to said slave station over a packet exchanging system communication channel.

2. A satellite communication data delivery method, comprising the steps of:

delivering data over a packet exchanging system communication channel from a master station to a plurality of slave stations via a satellite;

requesting assignment of a dedicated communication channel over a control channel via a satellite by a slave station that has received delivered data;

assigning dedicated communication channels and notifying said slave station of the assignment in response to the channel assignment request in said channel assignment request step by said master station; and

transmitting response data corresponding to the data delivered in said data delivery step to said master station, over the dedicated communication channels assigned by said channel assignment request step by a slave station.

3. A slave satellite, comprising:

a receiver for receiving delivery data transmitted by a master station over a packet exchanging system communication channel via a satellite; and

a transmitter for transmitting a channel assignment signal and response data corresponding to said delivery data to said master station, and transmits a signal requesting a dedicated communication channel from said transmitter and transmits response data to said master station over the dedicated communication channel assigned by said master station.

4. A master station, comprising:

a transceiver for transmitting delivery data to a plurality of slave stations over a packet exchanging system communication channel via a satellite and receiving response data from the slave stations over dedicated communication channels via a satellite; and

a channel assignment controller for assigning said dedicated communication channel in response to the channel assignment request signal transmitted during or on completion of the reception of delivery data transmitted from the transceiver by said slave station.

8. A slave station, comprising:

a receiver for receiving packets transmitted from a master station over a packet exchanging system communication channel via a satellite;

a transmitter for transmitting a channel assignment request signal to said master station and response data corresponding to the delivery data from said master station;

a data type determination section for determining whether the packets received via said receiver are delivery data or a channel assignment signal; and

a channel controller for changing the transmission channel for said transmitter based on a channel assignment signal in case the packets determined by said data type determination section are a channel assignment signal.