Handover procedures in radio communication system

A telecommunications system and handover technology, applied in wireless communication, multiplex communication, code division multiplex system, etc., can solve problems such as unbearable execution delay and achieve high handover processing speed

Inactive Publication Date: 2005-05-25
SIEMENS INFORMATION & COMM NEWTWORKS INC
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  • Abstract
  • Description
  • Claims
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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

Examples

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Embodiment Construction

[0117] 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 for use in a cell One of those general carriers (which are much smaller in number than those used in GSM due to the wide band) repeated indefinitely. The basic frame of Fig. 9 comprises m time slots UL#0, ..., UL #m (uplink) from mobile unit MS and n time slots DL #n, ... from BTSC (Fig. 2) , 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, thus simplifying synchroni...

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Abstract

The invention relates to a handover method in a UMTS mobile system adopting TDD type full-duplex TDMA-SCDMA technology (and FDMS-SDMA). The complexity of the technology used requires a frame synchronization mechanism using a downlink pilot signal broadcast by the base station, echoed by a signature sequence sent by a single mobile unit during the anticipated uplink access procedure. These, together with the high encryption speed (1.28M chips) required by the CDMA technique, lead to the undue addition of other fields to the downlink pilot sequence which should remain a purely synchronous sequence. In contrast to GSM, there is a lack of a field in the synchronization burst for the transmission of the system frame number FSN, which is absolutely necessary for hyperframe synchronization and to start encryption on the channel. SFN information is included in the common signaling channel as other broadcast information. This would result in an unacceptably slow handover, so a message is created and given to the network to return the current system frame number FSN in the new cell in dedicated mode in reply to the handover access message sent by the mobile.

Description

technical field [0001] The present invention relates to the field of mobile radiotelephony, and in particular to a method for performing handover in a third generation mobile telecommunication system. 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 obta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/38H04B7/26H04J13/00H04W36/08H04W56/00
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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