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A method and system for configuring a radio interface between a mobile station and a base station in a time-division multiplex mobile radio system for packet data transmission, wherein time slots for signalling in the uplink direction are allocated by a base station to the mobile stations in accorda

A method and system for configuring a radio interface between a mobile station and a base station in a time-division multiplex mobile radio system for packet data transmission, wherein time slots for signalling in the uplink direction are allocated by a base station to the mobile stations in accordance with a sequence which can be predetermined independently of packet data transmission. The fixed allocation of a time slot for signalling, in addition to mobile stations to which no physical channel is currently allocated, allows the base station to carry out continuous measurement relating to the radio interface. Thus, when packet data transmission resumes, immediately valid measurements are available for configuration of the radio interface.

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A method and system for configuring a radio interface between a mobile station and a base station in a time-division multiplex mobile radio system for packet data transmission, wherein time slots for signalling in the uplink direction are allocated by a base station to the mobile stations in accorda

A method and system for configuring a radio interface between a mobile station and a base station in a time-division multiplex mobile radio system for packet data transmission, wherein time slots for signalling in the uplink direction are allocated by a base station to the mobile stations in accordance with a sequence which can be predetermined independently of packet data transmission. The fixed allocation of a time slot for signalling, in addition to mobile stations to which no physical channel is currently allocated, allows the base station to carry out continuous measurement relating to the radio interface. Thus, when packet data transmission resumes, immediately valid measurements are available for configuration of the radio interface. er, and any intermediate routers comprise: a first port through which datagrams for a given flow may be received from a primary path that originates at the ingress router; a second port through which datagrams for the flow may be received from at least one secondary path contemporaneously with the reception at said first port, said at least one secondary path at least partially distinct from the primary path but originating at the same ingress router; and a controller for preferentially selecting datagrams received via said first port, said controller comprising a memory for program instructions, and a processor for executing said instructions to configure the router to perform the steps of: establishing the primary path for the given flow between the ingress router and the egress router; establishing said at least one seconds path for a given flow between the ingress muter and the egress router; in response to a failure in the primary path, automatically selecting an operational one of said at least one secondary paths for primary communication between the ingress router and the egress router; and in response to the selection of said as secondary path, automatically establishing at least one replacement secondary, at least partially distinct, path. 11. The system of claim 10 wherein the controller designates the port from which it selects datagrams for routing as the router's primary port for the given flow and the second port as its secondary port. 12. The system of claim 11 wherein the controller is figured to monitor physical level maintenance information. 13. The system of claim 11 wherein the controller is responsive to physical level maintenance information that indicates a failure in the a path associated with the primary port by selecting datagrams from the secondary port for routing. 14. The system of claim 13 wherein the controller is fu her responsive to physical level maintenance information by employing provisioned flow to propagating alarms. 15. The system of claim 14 wherein the controller is further responsive to physical level maintenance information that indicates a failure in the primary path by designating the secondary path as the primary path and by employing the propagation of alarms to establish one or more new secondary paths. 16. The system of claim 15 wherein the physical level maintenance information is SONET physical level maintenance information. 17. The system of claim 16 wherein the controller is responsive to SONET loss of signal physical level maintenance information by selecting datagrams from the secondary port for routing. 18. The system of claim 15 wherein the physical level maintenance information is SDH physical level maintenance information. 19. A method of communicating datagrams through an Internet protocol network comprising the steps of: for each router, establishing a primary explicitly routed label switched path for a given data flow between an ingress router and an egress router; for each router, establishing at least one secondary, at least partially distinct, explicitly routed label switched path for a given data flow between the ingress router and the egress router, such that the data flow from said at least one secondary, at least partially distinct, explicitly routed label switched path is received by a second port of the egress router contemporaneously with the reception of the data flow from said primary explicitly routed label switched path at a first port of the egress router; in response to a failure in the primary explicitly rout label switched path of any one or more of said routers, automatically selecting an operational one of said at least one secondary explicitly routed label switched paths, for each of the tailed routers, for primary communication between the ingress router and the egress router; and in response to the selection of said secondary explicitly routed label switched paths, automatically establishing at least one replacement second