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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

Inactive Publication Date: 2003-10-22
SIEMENS INFORMATION & COMM NEWTWORKS INC
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  • Abstract
  • Description
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Problems solved by technology

[0051] 4. In the case of specific functions such as joining, authentication, etc., there is no MS initiative for user and network operations, which will not be described below
That is to say, a separate process lacking the means provided by the present invention will present problems due to the new position of the frame number SFN at the time of handover, just because it cannot tolerate execution delays due to the acquisition time of the new cell SFN value

Method used

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  • Handover procedures in radio communication system
  • Handover procedures in radio communication system
  • Handover procedures in radio communication system

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Embodiment Construction

[0169] Figure 9 (Explained in previous figures) shows the sequential structure of seven time intervals or time slots and three other special time slots (to be described later) within a 3G basic frame, which is used for those used for cells One of the general carriers (which are much smaller in number than those used in GSM due to the wide band) repeats indefinitely. Figure 9 The basic frame consists of m time slots UL#0, ..., UL#m (uplink) from mobile unit MS and from BTSC ( figure 2 ) of n time slots DL#n, ..., DL#0 (downlink), the TDD type full duplex is implemented in the 3G system. The physical channel of the Uu interface is formed by a set including the carrier and its used time slot and spreading code, which is used to support channel characteristic information from a logical point of view. Sequential frames are organized in multiple levels observed across all carriers used in the 3G system. The carriers transmitted by the BTSs transmit mutually synchronized frames...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04J13/00H04W36/08H04W56/00
CPCH04W36/0072H04W56/00
Inventor 罗塞拉·德本尼迪蒂斯费比奥·D·皮亚纳
Owner SIEMENS INFORMATION & COMM NEWTWORKS INC
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