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A traffic control system is described. The traffic control system comprises a primary controller. The primary controller receives information about traffic in an area. The traffic control system further includes a plurality of subsidiary controllers providing information to and receiving information

A traffic control system is described. The traffic control system comprises a primary controller. The primary controller receives information about traffic in an area. The traffic control system further includes a plurality of subsidiary controllers providing information to and receiving information from the primary controller. Each of the plurality of subsidiary controllers is associated with a cell within the area. Each of the subsidiary controllers receives and provides information to at least one vehicle concerning traffic conditions within its associated cell. The primary controller and each of the subsidiary controllers are capable of negotiating a change in the flow of traffic based upon traffic conditions. The at least one vehicle is granted a permission based upon its role.

대표청구항 ▼

A traffic control system is described. The traffic control system comprises a primary controller. The primary controller receives information about traffic in an area. The traffic control system further includes a plurality of subsidiary controllers providing information to and receiving information

A traffic control system is described. The traffic control system comprises a primary controller. The primary controller receives information about traffic in an area. The traffic control system further includes a plurality of subsidiary controllers providing information to and receiving information from the primary controller. Each of the plurality of subsidiary controllers is associated with a cell within the area. Each of the subsidiary controllers receives and provides information to at least one vehicle concerning traffic conditions within its associated cell. The primary controller and each of the subsidiary controllers are capable of negotiating a change in the flow of traffic based upon traffic conditions. The at least one vehicle is granted a permission based upon its role. mbly machine focuses on the fact that each unit is provided with coding indicating at least the type of the specific function unit. The coding is transmitted via data transmission existing between the individual function unit and a central control unit. The coding makes possible continuous checking of the control program, such that certain program sequences for certain workstations are only executed when the coding of these workstations agrees with the respective program sequence. A number of other important functions are monitored, corrected and made to coincide with the central programming. {kl} of paths that maximize the residual bandwidth at that offset satellite-fixed cell; i. picking, from each set {kl} of paths determined for each offset satellite-fixed cell, one path p such that the combined set CS of paths for all of the offset satellite-fixed cells minimizes the number of communication link changes necessary to maintain a call between the source user and the end user as the satellites move in their orbits; and j. reserving at each offset satellite-fixed cell, the bandwidth along the path picked in step i, corresponding to the particular QoS requirement of the call. 2. A method for predictive QoS routing of calls within a satellite network as set forth in claim 1, wherein the calculation of the minimum residual link capacity for each of the plurality of paths at a given offset satellite-fixed cell l is defined by rp(l)=ci(l)-Rp,where ci(l) is the current link capacity of link i at offset satellite-fixed cell l, and where Rprepresents the bandwidth required for a new call on path p if the connection is admitted in the offset satellite-fixed cell l, and where where b represents the token bucket size, Ctotrepresents the total rate-dependent delay experienced by a packet belonging to the call, Dreqrepresents the end-to-end delay requirement of each packet, and d(p) represents the end-to-end propagation delay for a chosen path p if the connection is admitted on the offset satellite-fixed cell l. 3. A method for predictive QoS routing of calls within a satellite network as set forth in claim 2, wherein the step of picking a path from each set of {kl} paths includes the sub-steps of: i. picking, for each set of paths {kl} for offset satellite-fixed cells l=1, . . . ,L, a path, where the combined set of picked paths over all of the offset satellite-fixed cells l=1, . . . ,L is defined as a combined set of picked paths CSm,where m=1, . . . ,kL; ii. determining the total number of link changes HSmrequired on the combined set of picked paths CS; iii. repeating sub-steps i and ii for each different combination of paths; iv. determining an overall reward for each combination set Sm={p1(i1), p2(i2), . . . , pL(iL)}, where i1=1, . . . , k is the path chosen for offset satellite-fixed cell l, by: where W is a constant used to weigh the relative importance of having few link changes on the route for the call as offset calls are transitioned, with respect to the balancing of the user traffic; v. choosing the Smthat maximizes the reward(Sm); and vi. after a path for every offset satellite-fixed cell l=1, 2, . . . , L has been determined for the connection, reserving the necessary bandwidth for each path to satisfy the QoS requirements along the links forming the paths. 4. A method for predictive QoS routing of calls within a satellite constellation orbiting the earth, said satellite constellation including at least one orbit, with each one of the at least one orbit including a plurality S of satellites, each indexed by a number s, and communicatively connected by a plurality of communication links, with each particular satellite having a satellite-fixed cell divided, perpendicularly with respect to the orbit of the particular satellite, into a plurality L of satellite-fixed cell slots, with the movement of the plurality S of satellites over the earth being characterized in that the satellite-fixed cell for a satellite indexed at s covers the same area as the satellite-fixed cell of a satellite indexed at s+1 after passing over an area on the earth equivalent to the area of L satellite-fixed cell slots, and with an offset satellite-fixed cell being defined each time the satellite-fixed cell covers the area of one of L satellite-fixed cell slots