Introduction to WCDMA: Physical Channels, Logical Channels, Network, and Operation

WCDMA Services

The services that WCDMA can provide include voice services, data services, multicast services, location based services (LBS), and multimedia communication services that have various levels of quality of service (QoS).

Voice Services

Voice service is a type of communication service where two or more people can transfer information in the voice frequency band (not necessarily voice signals) through a communication network. Voice service involves the setup of communication sessions between two (or more) users that allows for the real time (or near real time) transfer of voice type signals between users.

The WCDMA system provides for various types of digital voice services. The voice service quality on the WCDMA system can vary based on a variety of factors. The WCDMA system can dynamically change the voice quality because the WCDMA system can use several different types of speech compression. The service provider can select and control which speech compression process (voice coding) is used. The selection of voice coders that have higher levels of speech compression (higher compression results in less digital bits transmitted) allows the service provider to increase the number of customers it can provide service to with the tradeoff of providing lower quality audio signals.

Data Services

Data Services are communication services that transfer information between two or more devices. Data services may be provided in or outside the audio frequency band through a communication network. Data service involves the establishment of physical and logical communication sessions between two (or more) users that allows for the non-real...

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