The table below summarizes the options: Channel Encoding Scheme is based on a convolution code at various code rates and GMSK modulation

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. Downlink uses first-come first-served packet scheduling and uplink uses a scheme that is similar to reservation ALOHA. The Multiple Access Coding Scheme is combined with statistical multiplexing, that allows several uses to share the same frequency channel. One pair of up-link and down-link frequency channels are assigned to a user during a session. Multiple access scheme is used in GPRS based on the FDD and TDMA. Explain the different coding schemes used in GPRS and their importance.