Distributed intelligence MAC protocols for DWDM ring networks
A metropolitan access network ( 10 ) uses a variation of a MAC protocol, where each station ( 14 ) on a ring ( 12 ) is associated with one or more time slot ( 30 ). Each slot carries information regarding the associated station, basic connection fields ( 32 ), communications fields ( 34 ), and quality of service fields ( 36 ). Each station maintains its own local database regarding the status of the network ( 10 ) by reading the information in each time slot ( 30 ).
1. A method for communicating from a station to a plurality of other stations over a ring network, comprising:
communicating data and control packets by the station on a channel, wherein the station periodically transmits the control packets on the channel to provide its status information to the other stations on the ring network and wherein the status information in the control packets comprises node identification to identify the station originating the control packet and rate information of current communications being transmitted to the other stations;
maintaining a local database of status of other stations on the ring network, wherein the local database is updated from the control packets received from the other stations on the ring network and includes rate information of current communications of the other stations; and
using a communication field in the control packet for bandwidth negotiation to secure bandwidth fairness based on the information in the local database.
2. The method of claim 1 , wherein each of the plurality of other stations maintain a local database of status of other stations on the ring network received in control packets.
3. The method of claim 2 wherein each of the local databases include a node identifier for each station on the ring network.
4. The method of claim 2 wherein each of the local databases include rate information and corresponding channel identifier for communications by the stations.
5. The method of claim 2 wherein each of the local databases include quality of service information for communications by the stations.
6. The method of claim 5 wherein the quality of service information includes information indicating type of communication.
7. The method of claim 5 wherein the type of communication includes best effort communication and time sensitive communication.
8. The method of claim 1 wherein the rate information of communications of the other stations includes reserved bandwidth for channels in the ring network.
9. A method of communicating in a device to other devices on a ring network, comprising the step of:
periodically transmitting control packets by the device on a channel in the ring network, wherein the control packets include quality of service and rate information of current communications of the device being transmitted to the other devices on the ring network;
reading control packets transmitted by the other devices on the ring network and maintaining a local database of the quality of service and rate information of current communications of the other devices on the ring network; and
negotiating bandwidth to secure bandwidth fairness based on the quality of service and rate information of current communications of the other devices.
10. The method of claim 9 wherein a same channel in the ring network is used to transmit both control and data packets.
11. The method of claim 9 wherein the quality of service information includes status of a communication and type of service of a communication.
12. The method of claim 11 further including the step of terminating a communication if it has been inactive for a prolonged period of time.
13. The method of claim 11 wherein the quality of service information includes rate information for communications of the devices.
14. The method of claim 9 wherein the quality of service information includes type of service of communications for the device.
15. The method of claim 14 wherein the type of service of communications for the device includes best effort type of service.
16. The method of claim 9 wherein each device uses Medium Access Control (MAC) protocol.
17. The method of claim 9 wherein the control packets further include a node identifier to identify the device originating the control packet.