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US 7,068,677 B1Granted
Subscriber radio access system
AssigneeFujitsu Limited
InventorsKoji Arai, Gen Nakagawa, Kenichi Aoki
Life of this patent
Estimating the term…
Abstract
A subscriber radio access system in which it becomes possible to facilitate communications for realizing high throughput and by which a radio LAN communication can be realized even if a radio link section is longer according to the CSMA protocol on Ethernet is provided. The subscriber radio access system includes plural transceiver terminals; and a base station linked to each of the plural transceiver terminals via a radio communication channel, wherein one of the plural transceiver terminals communicates to the other transceiver terminal with an Ethernet packet employing a carrier sense multiple access (CSMA) protocol, of which a packet length is corrected to correspond to a transmission delay time between the one and other transceiver.
Claims18
A subscriber radio access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication channel,
- wherein one of the plural transceiver terminals communicates to another transceiver terminal with an Ethernet packet employing a carrier sense multiple access (CSMA) protocol, of which a packet length is lengthened to correspond to an increase in a transmission delay time actually measured for said one of the plurality of transceiver terminals based on a radio transmission link section between the one and the other transceiver terminals via the base station.
1 more element
A subscriber radio access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication channel over a radio transmission link section,
- wherein one of the plural transceiver terminals communicates to another transceiver terminal with an Ethernet packet employing a carrier sense multiple access (CSMA) protocol, and wherein a packet length of the Ethernet packet is corrected by adding dummy bits to a standard Ethernet packet prescribed by the CSMA protocol, so that the corrected Ethernet packet has a packet length corresponding to transmission delay time actually measured for said one of the plurality of transceiver terminals based on the radio transmission link section between the one transceiver terminal and the base station, and the base station and the other transceiver terminal.
1 more element
A subscriber access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication for registering transmission delay times between each of the plural transceiver terminals and the base station,
- wherein each of the plural transceiver terminals measures and holds a transmission delay time between own terminal and the base station, queries to the base station a transmission delay time between a designated terminal and the base station registered in the base station when transmitting an Ethernet packet employing a carrier sense multiple access (CSMA) protocol to the designated terminal, and adds dummy bits corresponding to the accumulated transmission delay time between the designated terminal and the base station, and the transmitting receiver terminal and the base to correct a packet length of the Ethernet packet.
1 more element
A subscriber access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication for registering transmission delay time between each of the plural transceiver terminals and the base station,
- wherein each of the plural transceiver terminals calculates a shortest packet length according to transmission delay time between own transceiver terminal and the base station and a base station and a receiving transceiver terminal, and transmits an Ethernet packet employing a carrier sense multiple access (CSMA) protocol with a packet length longer than the calculated shortest packet length to the receiving transceiver terminal.
1 more element
A subscriber access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication for registering transmission delay times between each of the plural transceiver terminals and the base station,
- wherein each of the plural transceiver terminals measures and holds a transmission delay time between own terminal and the base station, queries to the base station for a transmission delay time between a designated terminal and the base station registered in the base station when transmitting an Ethernet packet employing a carrier sense multiple access (CSMA) protocol to the designated terminal, and calculates a shortest packet length corresponding to the calculated transmission delay time between the designated terminal and the base station, and the transmitting transceiver terminal and the base to form a packet length of the Ethernet packet having a packet length more than the shortest packet length.
1 more element
A subscriber access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication for registering transmission delay time between each of the plural transceiver terminals and the base station,
- wherein each of the plural transceiver terminals measures a transmission delay time between own terminal and a designated terminal by using a ping command when transmitting an Ethernet packet employing a carrier sense multiple access (CSMA) protocol to the destination terminal, and adds dummy bits to make a packet length of the Ethernet packet longer than a shortest packet length corresponding to the measured transmission delay time.
1 more element
A subscriber access system comprising:
- plural transceiver terminals;
- and
- a base station linked to each of the plural transceiver terminals via a radio communication for registering transmission delay time between each of the plural transceiver terminals and the base station,
- wherein each of the plural transceiver terminals measures a transmission delay time between own terminal and a designated terminal by using a ping command when transmitting an Ethernet packet employing a carrier sense multiple access (CSMA) protocol to the destination terminal, and calculates a shortest packer length corresponding to the measured transmission delay time to make the length of said Ethernet packet longer than said calculated shortest packet length.
1 more element
Dependencies are inferred from the claim text.