name: CDMA
full_form: Code Division Multiple Access
context: Summary based on the input to be provided by China Telecom at SA#78. This work item clarifies the requirements for domain selection between VoLTE and CDMA CS for terminating calls when the terminating UE is attached only to one domain (LTE or CDMA CS). Voice over LTE (VoLTE) is set to become mainstream technology for IP-based telecommunications. During the transition time where VoLTE deployments and coverage areas will co-exist with CS voice coverage areas, a selection problem will occur. CDMA uses different UE domain registration databases for CDMA CS and LTE. For a terminating call to subscriber with multi mode terminal that is only attached to one domain (LTE or CDMA CS), and when using the same Mobile Directory Number (MDN, i.e. the CDMA's equivalent to MSISDN), the CDMA operator will have to select which voice domain to use between LTE and CDMA CS. In order to make the correct decision on which domain to select for mobile terminated calls the requirements needed to be clarified,
description: Code Division Multiple Access (CDMA) is a technique used in wireless communication systems to allow multiple users to share the same frequency band. Each user's signal is assigned a unique code, enabling them to transmit and receive data without interfering with each other.
explanation: The description focuses on CDMA's function of enabling multiple users to share a frequency band through unique codes, which is the defining characteristic of a multiple access technique.
section_title: Enhancements to Domain Selection between VoLTE and CDMA CS
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