Abstract: The present invention relates to an Asynchronous Transfer Mode (ATM) protocol, and more particularly to an ATM Adaptation Layer 0 (AAL0) cell format for increasing trunk path efficiency when communicating voice traffic data by using the ATM protocol in a CDMA system. In a conventional CDMA system, the ATM is used to communicate multimedia traffic, including voice traffic data, through a backbone network, and AAL5 cell is most widely used in the ATM since it provides a simple and efficient process for data traffic. However, when processing full-rate voice traffic (i.e., 24 bytes of voice data per 20 ms-frame), two AAL5 cells are needed to communicate the full-rate voice data because one AAL5 includes only 16 bytes of data. This may result in few problems (e.g., traffic overload, cell loss and so forth). In order to eliminate the above problems, the present invention employs an AAL0 cell, in which 8 bytes of trailer are sacrificed and assigned to the voice traffic data, to enhance trunk path efficiency.

Abstract: The present invention is directed to a method and apparatus for downloading an operating system (OS) or an application and installing it on a set of base station controllers (BSCs) in a CDMA mobile communication system. According to the present invention, when a newer version of an OS or application needs to be installed on the set of BSCs, each of the BSCs is informed of the need for updating an OS or application by the base station manager (BSM), and simultaneously downloads the OS or application from the BSM for installation. This may diminish the traffic overload between the BSM and the BSCs by reducing the number of additional control signals communicated when the BSCs individually download the OS or application.