1xBTS — CDMA2000 1x and EV-DO Rev 0/Rev A base station and core network

Capabilities

Voice

QCELP and EVRC calls over RC1/RC2/RC3 traffic channels, with a SIP gateway to the PSTN.

Messaging

Mobile-originated and mobile-terminated SMS through the SMSC.

Packet data

1x IP connectivity via Service Option 33 (and SO7) with PPP/RLP and optional F-SCH.

EV-DO Rev 0/Rev A

Dedicated HRPD data carrier with UATI sessions, A8/A9 to PCF, and tested Rev A data at 2.6 Mbps down / 1.4 Mbps up.

Air interface

SR1 at 1.2288 Mcps over a 1.25 MHz channel — Walsh spreading, Viterbi decode, 800 Hz closed-loop power control.

Provisioning

Over-the-air NAM, PRL, and MMS via OTASP *228, straight from the handset.

Femtocell

Connect a compatible CDMA2000 femtocell over Ethernet, including Airave 2.5. Setup guide →

Deployment

Run the full stack on one host, or spread cells and base stations over Abis and A1.

Architecture

Built around the 3GPP2 1x and HRPD reference points (Abis, A1, A8/A9, A10/A11)

1x radio access

HandsetCDMA2000 1x

1x air↓

cdma-btsBTS1x PHY/MAC · SDR radio

Abis↓

cdma-bscBSCVoice, SMS, SO7/SO33

EV-DO radio access

AT / modemEV-DO Rev 0/Rev A

HRPD air↓

cdma-btsBTS + HRPD ANHRPD PHY · UATI, streams, traffic

↓

1x circuit services

cdma-bsc1x control edgeA1/A2p call control

A1/A2p↓

cdma-mscMSCCircuit-switched core

cdma-hlrHLRSubscriber + HRPD identity DB

cdma-smscSMSCShort messages

SIP↓

cdma-voice-gwvoice-gwPSTN

1x packet path

cdma-bsc1x data edgeSO7/SO33 over 1x TCH

packet client↓

cdma-pcfPCFShared 1x + EV-DO control

A10/A11↓

cdma-pdsnPDSNShared PPP/IP service

EV-DO packet path

cdma-btsHRPD edgeAN in the BTS, Default Packet Application

A8/A9↓

cdma-pcfPCFShared 1x + EV-DO control

A10/A11↓

cdma-pdsnPDSNShared PPP/IP service

↓

IPInternet

One MSC serves many base stations, each a BSC with many cells. The cdma-nib launcher runs a complete single-cell network on one host, with a few sidecar containers for support services like Postgres and the dashboard.

Implemented

✓Voice — QCELP and EVRC, mobile-originated & -terminated calls

✓SMS — MO & MT through the SMSC

✓1x packet data — SO33 / SO7, PPP, RLP, F-SCH

✓EV-DO / HRPD Rev 0/Rev A — UATI sessions and packet data

✓RC1, RC2 & RC3 traffic channels

✓800 Hz closed-loop power control

✓OTASP *228 — NAM, PRL, MMS

✓Node split over Abis, A1, A8/A9, A10/A11

✓SIP voice gateway to the PSTN

✓HLR & SMSC persistence (PostgreSQL)

✓Web dashboard over management gRPC

The core CDMA2000 1x feature set is implemented end to end, and EV-DO Rev 0/Rev A now carries packet data on a dedicated HRPD carrier. Work continues on production hardening, wider radio coverage, and broader handset compatibility.