for a given user if there is more than one set of qos requirements in any direction multiple lac mac instances each belonging to a different class are required in the example shown in fig4 forward traffic has only one qos requirement u2014 qos f 1 and reverse traffic has two requirements qos r 1 and qos r 3 a default and temporary class may be created in both a bsc and the associated msc for packet data flows that do not have a pre defined class for instance after a high speed packet data service option is connected a default i e best effort class of class 3 is created in both bsc and msc and serves as a temporary class for the so connection base station controls the setup of a class lac mac instance and concurrently determines the sr_id where sr_id f con_ref qos_class a packet data flow is received into qas 408 from a connected ip network and it is determined service instance table checks the value of sr_id where sr_id 5 that qos f of the signal is 1 the packet data flow is then associated with the parameters of class 1 406 which may indicate depending on the operator 39 s classification parameters broad bandwidth and high priority parameters the packet data flow is then passed through the class 1 lac mac generally the packets would have originated in a class 1 lac mac peer on the network through the mux and physical layer 402 next the packet data flow is sent to peer lac mac 409 for a targeted mobile station which receives downloads the packet data utilizing the associated class 1 parameters class parameters are usually determined by the customer and the operator before any use of the network by.