6. W-CDMA radio interface

6.1 FDD and TDD modes

A two-way radio communication system must transmit signals in the mobile-to-network direction, known as the uplink direction, and in the network-to-mobile direction, known as the downlink direction. Professional radio systems have long tolerated the use of a single radio frequency common to both directions, with speakers taking it in turns to speak: this is the alternating access mode. Since cellular systems are open to a wide audience, it was necessary from the outset to provide a system enabling both communicating users to speak simultaneously, as is the case in fixed telephony: this is the duplex access mode (figure 3 ).

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Bibliography

References

(1) - DUARTE (B.) - UMTS : Défis et perspectives. - Revue des Télécommunications Alcatel, 1 ^er trimestre 2001.
(2) - LESCUYER (P.) - UMTS : Les origines, l'architecture, la norme....

Standardization

GSM Release 99 Specifications (Release 99). - 3GPP TS 01.01 V8.1.0 - 2000-12
Principles of circuit telecommunication services supported by a Public Land Mobile Network (PLMN) (Release 99). - 3G TS 22.001 V3.2.0 - 2000-03
Circuit Bearer Services supported by a Public Land Mobile Network (PLMN) (Release 99). - 3G TS 22.002 V3.5.0 - 2000-10
Circuit Teleservices supported by a Public Land Mobile Network...

Regulations

Arrêté du 18 juillet 2001 autorisant la société Orange France à établir et exploiter un réseau radioélectrique de troisième génération ouvert au public et à fournir le service téléphonique au public, published in the Journal officiel on August 21, 2001.

Arrêté du 18 juillet 2001 autorisant la Société française du radiotéléphone à établir et exploiter un réseau radioélectrique de troisième génération...