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Soft handoff in a CDMA cellular telephone system

A multiple access communication and cellular technology, applied in the direction of code division multiplexing system, multiplexing communication, radio relay system, etc. Commands and conversations cannot continue, etc., to achieve the effect of reducing service failures and improving the overall reliability of the system

Inactive Publication Date: 2007-09-05
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This extra unwanted switch request increases the likelihood that the mobile station will receive the wrong channel switch command or
Also, switching back and forth will increase the likelihood that a call will not continue if it is unnecessarily switched to a unit where all channels are currently in use and cannot allow the switch

Method used

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  • Soft handoff in a CDMA cellular telephone system
  • Soft handoff in a CDMA cellular telephone system
  • Soft handoff in a CDMA cellular telephone system

Examples

Experimental program
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Embodiment Construction

[0042] Figure 1 shows a typical telephone system for one embodiment of the present invention. The system shown in Fig. 1 uses CDMA modulation technique in the communication between the system mobile station or mobile phone and the base station. Cellular systems in large cities have hundreds of base stations serving hundreds of thousands of mobile phones. Compared with the traditional FM modulation cellular system, the use of CDMA technology has greatly increased the user capacity of the same large and small system.

[0043] In FIG. 1, a system control and switch 10, also known as a Mobile Telephone Switching Office (MTSO), generally includes an interface and processing circuitry for system control of a base station. The controller 10 also controls the routing of calls from the public switched telephone network (PSTN) to the appropriate base stations for transmission to the appropriate mobile stations. The controller 10 also controls the routing of calls from the mobile stati...

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PUM

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Abstract

In a cellular telephone system a system for directing communications between a mobile user and cell-sites as a mobile user changes cell-site service areas. The mobile user includes an apparatus for, while in communication with another system user via one cell-site, determining a transition of the mobile user from the cell-site service area to the service area of another cell-site. The system includes circuitry responsive to the indication for coupling communications between the mobile user and the other system user via the new cell-site while the mobile user also remains in communication with the system user via the first cell-site. The system further includes apparatus responsive to the coupling of the communications between the mobile user and the other system user via the new cell-site for terminating the communications between the mobile user and another system user via cell-site with communications continuing between the mobile user and the system user via the new cell-site.

Description

[0001] This application is a divisional application of the application No. 02104635.2 entitled "Soft Handoff in Code Division Multiplex Communication Cellular Telephone System". technical field [0002] This invention relates to cellular (cellular) telephone systems, and more particularly to a new improvement in controlling handoff (handoff) in mobile station communications in base station (cell-site station) and code-division multiplex communication (CDMA) cellular telephone systems system. Background technique [0003] The use of code division multiplex modulation techniques. Just one of several techniques that simplify communication between users of multiple systems. Although other techniques are known such as Time Division Multiplexing (TDMA), Frequency Division Multiplexing (FDMA) and AM modulation techniques such as Amplitude Contraction and Spreading Single Sideband (ACSSB), CDMA has significant advantages over these modulation techniques. U.S. Patent Application No...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04J13/02H04W36/18
CPCH04W36/18H04B2201/70701H04B7/14
Inventor 吉洛豪森·克莱因S帕多瓦尼·罗伯托惠特利·Ⅲ·查尔斯E
Owner QUALCOMM INC