TDMA (Time Division Multiple Access)

Time Division Multiple Access lets multiple users share the same frequency channel by transmitting in successive time slots. TDMA was the access method of GSM, IS-136 D-AMPS, DECT, TETRA, and many satellite systems. It has been largely superseded by CDMA and OFDMA in mass-market mobile networks but persists in many specialised radio systems.

Categories: Radio Access NetworkInternet and RoutingEncryption and Cryptography

TDMA in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Telecom networks depend on Internet-style routing (BGP, DNS, MPLS) for interconnect, transport and application delivery. Route hijacks and DNS abuse can degrade or intercept signaling as easily as any application-layer attack, which is why RPKI and DNSSEC are now standard hardening for carrier networks.

To place TDMA in the wider telecom-security picture, review CDMA, OFDMA, Broadband, OFDM, Noise and RF.

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