1xBTS 1xBTS

Standards Compliance

3GPP2 and IETF specifications referenced in the implementation.

3GPP2 CDMA2000 (Primary)

StandardTitleCoverage
C.S0002-EPhysical Layer Standard for CDMA2000 Spread Spectrum SystemsRC1, RC3 forward/reverse, spreading, coding, interleaving
C.S0003-EMedium Access Control (MAC) StandardMuxPDU, rate decision, signaling
C.S0004-ESignaling Link Access Control (LAC) StandardARQ, MSG_SEQ/ACK_SEQ, CRC-30
C.S0005-EUpper Layer (Layer 3) Signaling StandardRegistration, origination, paging, service negotiation, orders
C.S0017-005-AData Service Options: SO7Basic PPP over RC1
C.S0017-012-AData Service Options: SO33High-rate PPP over RC3
C.S0017-010-ARadio Link Protocol Type 3RLP3 for SO33
A.S0003-AAbis BTS-BSC Interfacetarget for BTS/BSC control messages and bearer payload families
A.S0001IOS / A1 Interfacetarget for BSC/MSC call-control seam
A.S0014-DIOS A2p Bearer Interfaceper-circuit RTP/UDP EVRC voice bearer reference

3GPP2 Network Interfaces

StandardTitleCoverage
A.S0017-DInteroperability Standard for A10/A11packet data control/bearer reference for PCF/PDSN
X.S0011-003-ECDMA2000 Wireless IP Network StandardFOU tunneling reference
IS-2001Signaling transport referenceA1 signaling transport profile used by the current architecture

IS-95 Legacy

StandardTitleCoverage
IS-95AMobile Station–Base Station Compatibility StandardRC1 baseline, access channel, registration
IS-95BWideband Spread Spectrum Digital CellularExtended capabilities reference
IS-127Enhanced Variable Rate Codec (EVRC)Voice codec

IETF RFCs

RFCTitleCoverage
RFC 1661The Point-to-Point Protocol (PPP)LCP negotiation, state machine
RFC 1662PPP in HDLC-like FramingHDLC byte stuffing, FCS
RFC 1332PPP Internet Protocol Control Protocol (IPCP)IP address negotiation
RFC 3558RTP Payload Format for EVRC and SMVEVRC RTP payload format used by the A2p bearer

Notes

Physical layer focuses on SR1 (1.2288 Mcps) with RC1 and RC3. Layer 3 covers the common message types for registration, call setup, SMS, and data. RLP implements Type 1 (SO7) and Type 3 (SO33). PPP covers LCP + IPCP for CDMA packet data. The current architecture keeps standards seams separate from gRPC service boundaries: Abis, A1, A2p, A8/A9, and A10/A11 are protocol boundaries, while gRPC is used for operator, diagnostics, HLR/SMSC, and packet service APIs. A8/A9 and A10/A11 are not fully networked yet: packet sessions currently cross the local packet gRPC service, A8/A10 GRE codecs exist, and the UDP bearer drivers plus separate standards PCF/PDSN transports remain planned work.