This paper describes a link layer protocol that provides for reliable delivery of user data over a wireless channel. This radio link access procedure (LAPR) is based on LAPB (used by X.25) and LAPM (used by V.42 error correcting modems), but has some deviations due to the nature of the radio link; these similarities and differences are discussed. Coordination between LAPR and call control signaling is discussed. The wireless access communications system employs TDMA/TDM on the radio interface.
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