Improving the performance of a wireless CSMA-based MAC communication system using a spatially selective antenna
First Claim
1. A device to be used in a wireless communication system with CSMA-based MAC, comprising:
- means for transmitting at least a first and second Request-to-Send (RTS) messages and at least a first and second data packets on a transmission medium, anda spatially selective antenna,wherein said second RTS message is transmitted after said first RTS message and before said transmission of said first data packet is finished, wherein said at least first and second data packet are transmitted on said transmission medium at least partially in parallel, and wherein said device uses said spatially selective antenna to direct a transmission null towards a first station for the transmission of said second RTS message, to direct a transmission peak towards said first station for the transmission of said first data packet, and to direct a transmission peak towards a second station for the transmission of said second data packet.
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Accused Products
Abstract
Described herein is a device to be used in a wireless communication system with CSMA-based MAC, comprising a mechanism for transmitting at least a first and second Request-to-Send (RTS) messages and at least first and second data packets on a transmission medium, and a spatially selective antenna. In one aspect, the device uses a distributed antenna that combines the antenna elements of several devices and the device observes the transmissions of other devices, analyzes the observed transmissions for transmission patterns and adapts its own transmissions to the detected transmission patterns. Also described is a corresponding system, method and computer program to be used in a wireless communication system.
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Citations
17 Claims
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1. A device to be used in a wireless communication system with CSMA-based MAC, comprising:
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means for transmitting at least a first and second Request-to-Send (RTS) messages and at least a first and second data packets on a transmission medium, and a spatially selective antenna, wherein said second RTS message is transmitted after said first RTS message and before said transmission of said first data packet is finished, wherein said at least first and second data packet are transmitted on said transmission medium at least partially in parallel, and wherein said device uses said spatially selective antenna to direct a transmission null towards a first station for the transmission of said second RTS message, to direct a transmission peak towards said first station for the transmission of said first data packet, and to direct a transmission peak towards a second station for the transmission of said second data packet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A device to be used in a wireless communication system with
CSMA-based MAC, comprising: -
means for transmitting one Request-to-Send (RTS) message and at least a first and second data packets on a transmission medium, and a spatially selective antenna, wherein said one RTS message contains information on at least a first and a second stations to which said at least first and second data packet are to be transmitted, respectively, wherein said device uses said spatially selective antenna to direct a transmission peak towards said first station for the transmission of said first data packet and a transmission peak towards said second station for the transmission of said second data packet, and wherein said transmission of said first data packet takes place at least partially in parallel to the transmission of said second data packet.
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16. A device to be used in a wireless communication system with CSMA-based MAC, comprising:
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means for transmitting a first Request-to-Send (RTS) message and a data packet on a transmission medium, means for transmitting a NULL message, which indicates that said transmission medium is idle, and a spatially selective antenna, wherein said NULL message is transmitted after the transmission of said first RTS message and before the transmission of said data packet is finished, and wherein said device uses said spatially selective antenna to direct a transmission null towards a first station for said transmission of said NULL message and to direct a transmission peak towards said first station for said transmission of said data packet.
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17. A method to be used in a wireless communication system with CSMA-based MAC, comprising the steps of:
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transmitting a first Request-to-Send (RTS) message on a transmission medium; transmitting a second RTS message on the transmission medium; and transmitting at least a first and second data packets on the transmission medium, wherein said at least first and second data packets are transmitted on said transmission medium at least partially in parallel, and wherein a spatially selective antenna is used to direct a transmission null towards a first station for the transmission of said second RTS message, to direct a transmission peak towards said first station for the transmission of said first data packet, and to direct a transmission peak towards a second station for the transmission of said second data packet.
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Specification