Handover procedures in radio communication system

A telecommunication system and handover technology, which is applied in wireless communication, multiplexing communication, code division multiplexing system, etc., can solve the problem of unbearable execution delay, etc., and achieve the effect of high handover processing speed
CN1451250AInactive Publication Date: 2003-10-22SIEMENS INFORMATION & COMM NEWTWORKS INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SIEMENS INFORMATION & COMM NEWTWORKS INC
Publication Date
2003-10-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

Intercell handover method in UMTS mobile systems in TDMA-SCDMA technique (and also FDMS-SDMA) with full duplexing of the TDD type. The complexity of the technique adopted requires a frame synchronization mechanism employing a downlink pilot signal, broadcasting transmitted by the base station, echoed by signature sequences transmitted by the single Mobile units in the procedures foreseeing an uplink access. The above, together with the high cipher speed (1.28 Mchip) imposed by the CDMA technique, makes inappropriate the addition of other fields to the sequence of the downlink pilot, which shall remain a pure synchronization sequence. Contrarily to the GSM, a field is missing in the synchronism burst for the transport of the system frame number FSN, absolutely necessary for the iperframe synchronism and the starting of ciphering on the channel. The information on SFN is included in the common signalling channel as other broadcasting information.
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Description

technical field

[0001] The present invention relates to the field of mobile radiotelephony, and in particular to a procedure for performing handovers in third generation mobile telecommunication systems. Background technique

[0002] For the past decade, mobile radiotelephone systems have undergone a period of continuous technological development, from the gradual abandonment of first-generation systems (characterized by analog modulation of the transmission carrier) to second-generation systems (characterized by digital modulation and pair switching Perform extensive digital processing (DigitalSignal Processing, DSP) for the digital baseband signal. Now it has matured into the mobile system service of a more advanced concept, which is the so-called third-generation system. The difference between it and the previous two-generation systems lies in the different access methods of service users to physical channels. The design of these systems takes advantage of applications o...

Claims

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