GPRS (General Packet Radio Service) Question:

☆ Multiple access scheme is used in GPRS based on the FDD and TDMA
☆ One pair of up-link and down-link frequency channels are assigned to a user during a session
☆ The Multiple Access Coding Scheme is combined with statistical multiplexing [packet mode communication], that allows several uses to share the same frequency channel
☆ Down-link uses first-come first-served packet scheduling and up-link uses a scheme that is similar to reservation ALOHA.
☆ Slotted ALOHA is utilized for reservation inquiries in a contention phase, followed by transferring data by utilizing dynamic TDMA with first-come, first-served scheduling