[특허]Data link layer extensions to a high latency wireless MAC protocol

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-012/56
출원번호	US-0115435 (1998-07-14)
발명자 / 주소	McKay, Danny N. Baker, Murray C. Sinha, Rupam Jean, Nelson Wong, Daniel Y.
출원인 / 주소	International Business Machines Corporation
대리인 / 주소	Cameron, Douglas W.Dougherty, Anne Vachon
인용정보	피인용 횟수 : 33 인용 특허 : 20

초록 ▼

The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the pro

The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the protocol within the reservation. In the method a station sends a request message on the communication medium for a reservation of the medium to a recipient station in the network. The recipient station sends a reservation confirmation message back to the sending station which receives it and responds to the reservation confirmation message by sending an ordered sequence of data frames to the recipient station. After sending the ordered sequence of data frames the sending station sends an end of transmission message to the recipient station, which replies by sending back an end of transmission confirmation identifying the number of frames received in their original sequence. If the number is not correct remedial action can be taken by the sending station to resend missing data. Address conflict resolution is also provided by another aspect of the invention. The invention has embodiments which handle unicast and groupcasting transmissions.

대표청구항 ▼

The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the pro

The invention provides a method for communication between a plurality of stations in a communication network using media access protocol, in which medium access is granted to stations obtaining a successful reservation of the medium and in which data transmission verification is performed by the protocol within the reservation. In the method a station sends a request message on the communication medium for a reservation of the medium to a recipient station in the network. The recipient station sends a reservation confirmation message back to the sending station which receives it and responds to the reservation confirmation message by sending an ordered sequence of data frames to the recipient station. After sending the ordered sequence of data frames the sending station sends an end of transmission message to the recipient station, which replies by sending back an end of transmission confirmation identifying the number of frames received in their original sequence. If the number is not correct remedial action can be taken by the sending station to resend missing data. Address conflict resolution is also provided by another aspect of the invention. The invention has embodiments which handle unicast and groupcasting transmissions. 1. A multi-port data communication device including a multiplicity of receive ports, a multiplicity of transmit ports, a first respective temporary storage space for packets received from a receive port, a second respective temporary storage space for packets that are to be forwarded from a transmit port, and a common central memory interposed between the first and second temporary storage spaces whereby all data packets must pass through the common central memory, means for writing packet data into said common memory space in bursts in dependence on the grant of respective receive write requests; means for reading packet data from said common memory space in bursts in dependence on the grant of respective transmit read requests; and a central arbiter for receiving said requests and determining the order in which they are performed by the common central memory, wherein a transmit read request for a first burst of data in a packet has in said central arbiter a relatively low priority and transmit read requests for a second and any subsequent burst of data in a packet have in said central arbiter a relatively high priority. 2. A multi-port data communication device including a multiplicity of receive ports, a multiplicity of transmit ports, a first respective temporary storage space for packets received from a receive port, a second respective temporary storage space for packets that are to be forwarded from a transmit port, and a common central memory interposed between the first and second temporary storage spaces whereby all data packets must pass through the common central memory; means for writing packet data into said common memory space in bursts in dependence on the grant of respective receive write requests; means for reading packet data from said common memory space in bursts in dependence on the grant of respective transmit read requests; and a central arbiter for receiving said requests and determining the order in which they are performed by the common central memory; wherein a transmit read request for a first burst of data in a packet has in said central arbiter a relatively low priority and transmit read requests for a second and any subsequent burst of data in a packet have in said central arbiter a relatively high priority; and wherein said receive write requests have in said central arbiter a priority intermediate said relatively low priority and said relatively high priority. 3. A device according to claim 1 wherein each first respective storage space includes a fifo for storing packet data corresponding to the size of a burst. 4. A device according to claim 1 wherein each first respective storage space comprises two fifos in tandem each organised to receive and transmit packet data in a burst. 5. A device according to claim 1 wherein each second respective storage space includes a fifo for storing packet data corresponding to the size of a burst. 6. A device according to claim 1 wherein each second respective storage space comprises two fifos in tandem, each organised to receive and transmit packet data in a burst. 7. A device according to claim 2 wherein each first respective storage space includes a fifo for storing packet data corresponding to the size of a burst. 8. A device according to claim 2 wherein each first respective storage space comprises two fifos in tandem each organized to receive and transmit packet data in a burst. 9. A device according to claim 2 wherein each second respective storage space includes a fifo for storing packet data corresponding to the size of a burst. 10. A device according to claim 2 wherein each second respective storage space comprises two fifos in tandem, each organized to receive and transmit packet data in a burst.

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