Access Network (AN)

The AN is composed of the Base station Transceiver System(BTS), Base Station Controller(BSC), General ATM switch Network(GAN), Access Network-Authorization, Authentication and Accounting(AN-AAA ), and Data Location Register/DLR Local Manager(DLR/DLM).

The AN provides voice service through the VCN and delivers the packet data received from the Mobile Station(MS) to the DCN.

Base station Transceiver System (BTS)

BTS provides an air interface for Mobile Station(MS), and transmits or receives wireless data and signal data to or from MSs under the CDMA2000 1X/1xEV-DO standard.

BTS sends the data received from MSs to the core network through BSC, or conversely sends the data received from the core network to MSs through BSC. To serve as a wireless transceiver mentioned above, BTS manages radio resources such as FA and Walsh, schedules Radio Frequency(RF), or controls power.

The BTS of a single 1xEV-DO network is called Access Network Transceiver System (ANTS).

Base Station Controller (BSC)

BSC interfaces with several BTSs. Also, BSC interfaces with MSC to process voice and circuit data calls, and interfaces with GAN and DCN to process packet data calls.

Also, BSC inter-works with BSM to perform operation and maintenance functions in Base Station System(BSS). BSC performs vocoding for voice calls, and performs Radio Link Protocol(RLP) for data calls. BSC supports the Select and Distribute Unit(SDU) function for voice and data calls to enable soft handoff in MSs.

The BSC of a single 1xEV-DO network is called Access Network Controller(ANC).

General ATM switch Network (GAN)

GAN provides communication paths between BSCs. GAN interfaces with several BSCs to enable handoff between BSCs, and to enable BSM to communicate with BSC and BTS connected to each BSC through GAN. Also, packet data calls can be transmitted from BSC to PDSN through GAN.

Also, GAN manages subscriber mobility and session data, and provides a path between BSC and DLR/AN-AAA for the authorization of MS in 1xEV-DO.

Base Station Manager (BSM)

BSM provides an operator interface so that the operator can control or manage BSC and BTS. BSM provides commands that enable system failure/status/performance data retrieval, system configuration management, and system parameter control, which are required for the operation and maintenance of BSC or BTS. BSM operates on a conventional workstation platform, and is implemented by using Graphical User Interface(GUI), enabling the operator to check or control the system status conveniently.

Access Network-Authorization, Authentication and Accounting (AN-AAA)

The AN-AAA server authenticates the MS in the 1xEV-DO network. Once AN-AAA receives a request for authorization, AN-AAA assigns International Mobile Station Identity(IMSI) to MS based on Network Access Identifier(NAI) of MS, and manages mapping data on IMSI and NAI of MS.

Data Location Register/DLR Local Manager (DLR/DLM)

DLR, which performs mobility management for the wireless subscribers of the 1xEV-DO network, provides the terminal location information management, Unicast Access Terminal Identifier(UATI) assignment request process, International Mobile Station Identity(IMSI), session control/management of the MS, and the paging function for the MS.

DLM provides the operator interface for the DLR and provides the input/output for the operator’s commands, displays fault/configuration/status/performance messages, restarts the system, and downloads the software blocks.