The network ( air ) interface between a mobile end system ( m - es ) and the cellular digital packet data ( cdpd ) - based wireless packet data service provider network 移动终端系统( m - es )和基于蜂窝数字分组数据（ cdpd )之间的网络（空中）接口，基于无线分组数据业务提供商网络。
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The medium access control ( mac ) layer protocol of the airlink interface between the mobile data base station ( mdbs ) and mobile end systems ( m - ess ) in cellular digital packet data ( cdpd ) is studied firstly . the access method of slotted non - persistent digital sense multiple access with collision detection ( dsma / cd ) is described mainly 本文首先研究了蜂窝数字分组数据( cdpd )空中接口中的介质接入控制层( mac )协议，详细论述了基于时隙的非坚持的、带冲突检测的数字载波侦听多址接入协议( dsma cd ) 。
