Multi-user systems ·Assume 一 m incoming streams,each of rate A/m 一 Service times are i.i.d and independent of arrivals with mean 1/u,second moment E[X2] Server serves all packets from stream 1,then all packets from stream 2 and so on... Fixed reservation interval Vi =V(for all i),but data transmission intervals are not fixed Packet i from stream 3 arrives Start of packet i transmission R3 R1 R2 R3 R1 长 Residual Packets in queue to wait for Reservation intervals to wait for Weigiang Sun Communication NetworksWeiqiang Sun Communication Networks Multi-user systems • Assume – m incoming streams, each of rate λ/m – Service times are i.i.d and independent of arrivals with mean 1/μ, second moment E[X2 ] – Server serves all packets from stream 1, then all packets from stream 2 and so on… – Fixed reservation interval Vi = V (for all i), but data transmission intervals are not fixed 7 R3 R1 R2 R3 R1 Packet i from stream 3 arrives Start of packet i transmission Residual Packets in queue to wait for Reservation intervals to wait for