RESERVATION SYSTEMS Single channel shared by multiple users Only one user can use the channel at a time Need to coordinate transmissions between users ° Polling systems Polling station polls the users in order P g olins to see if they have something to send station A scheduler can be used to receive and schedule transmission requests @⑩四 R1 DI R2 D2 R3 D3 R1 DI Reservation interval (r) used for polling or making reservations Data interval (D)used for the actual data transmissionRESERVATION SYSTEMS • Single channel shared by multiple users • Only one user can use t he channel at a time • Nee d to coordinate transmissions between users • Polling systems – Polling station polls the users in order Polling to see if they have something to send station – A scheduler can be used to receive and schedule transmission requests U1 U2 U3 U4 U5 R1 D1 R2 D2 R3 D3 R1 D1 – Reservation interval (R) used for polling or making reservations – Data interval (D) u sed for the actual data transmission Eytan Modiano Slide 2