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CDMA mobile communication method, system and mobile station equipment

A mobile communication and mobile station technology, applied in the field of reception level control and handover operation, can solve the problems of communication interruption, a large number of control processing, etc., and achieve the effect of preventing instantaneous interruption

Inactive Publication Date: 2004-10-06
KOKUSA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, significant control processing would be required for level measurement and comparison
Also, during the handover operation, there is a momentary interruption of communication due to the switching of the radio frequency

Method used

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  • CDMA mobile communication method, system and mobile station equipment
  • CDMA mobile communication method, system and mobile station equipment
  • CDMA mobile communication method, system and mobile station equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Figure 1A and 1B Represented is a block diagram of a first embodiment of a transmitter of a base station and a receiver of a mobile station of a CDMA mobile communication system according to the present invention, figure 2 Indicates the frame structure and receiving timing used in the present invention;

[0030] refer to Figure 1A , reference numeral 101 indicates a frame assembler for frame input data, 102 is an error correction encoder for error correction encoding of framed data, and 103 is a main frame for phase modulating the output of error correction encoder 102 Modulator. Numeral 105 denotes a secondary modulator for spreading the main modulated signal by the spreading code generated by the spreading code sequence 104 . 106 is a frequency converter for converting the spread signal into the transmission frequency. 107 is a transmission power amplifier for power amplification. 109 is a main controller for controlling the above-mentioned individual units.

...

Embodiment 2

[0039] Figure 3 shows another embodiment of the present invention. Figure 3A and 3B show a block diagram of a second embodiment of the construction of the CDMA mobile communication system according to the present invention. Figure 3A 3B shows the structure of the base station transmitter, and FIG. 3B shows the structure of the mobile station receiver. Figure 4 Shown is the frame structure and reception timing used in the present invention.

[0040] Figure 3A The transmitter of the base station is shown with Figure 1A Shown is the difference between the base station's transmitter and the Figure 3A There is a modulation level controller 304 in which, eg from quadrature phase modulation to hexadecimal phase modulation, controls the main modulation unit 303 to enable variable modulation levels.

[0041] Additionally, the mobile station receiver of Figure 3B is compatible with Figure 1B The difference between the base station receivers shown is that Figure 3B has a demod...

Embodiment 3

[0046] as in Figure 1A and 1B , figure 2 In the case of level monitoring described in the reference Figure 5 to Figure 8 Handover for changing base stations during communication using the same equipment will be described below.

[0047] The system architecture for handover is as Figure 5 shown. Mobile station 504 is in communication with communication base station 502 . As the measurement result, the new base station 503 is the best in the measurement results, and a handover to the new base station 503 is required. In this case, handover is under the control of the upper station 501 of the communication base station 502 and the new base station 503 .

[0048] FIG. 6 is a structural block diagram of the sending unit of the mobile station 504 . In this figure, the symbol 60X (X=1-7.9) corresponds to Figure 1A The symbol 10X in.

[0049] This sending unit is compatible with the Figure 1A The difference between the base station transmission units shown in is that the ...

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Abstract

A CDMA mobile communication system which creates the time during which peripheral base stations using different radio frequencies and executes the hand-off between base stations using different radio frequencies without momentary interruption. A mobile station (504) of the CDMA mobile communication system suspends the error correcting and decoding processing of received signals, outputs user data which are not subjected to the error correcting and decoding processing, and, during this suspending time, monitors the receiving levels of the peripheral base stations by switching the receiving frequency to the radio frequencies of the base stations. The base station (502) now in contact and the next base station (503) transmit only the user data during the hand-off period from the base station (502) to the next base station (503) using different frequencies and do not transmit transmission signals during the transmitting period of an error correcting and encoding check bit. The mobile station (504) receives and demodulates signals transmitted from the base station (502) and, during the transmitting period of the error correcting and encoding check bit, receives and demodulates signals transmitted from the next base station (503) by switching the frequency of its receiver to that of the next base station (503).

Description

[0001] This application is a divisional application of the patent application with the application number 96190593.x, the application date being May 30, 1996, and the title of the invention being "CDMA mobile communication method, system and mobile station equipment". technical field [0002] The present invention relates to reception level control and handover operation in cellular mobile communication. Background technique [0003] In cellular mobile communication, a large number of base stations are scattered in a large service area. When the mobile station moves, the base station to be linked to is continuously changed so that the mobile station can continue communication with the base station with the best communication quality. In this case, in order to search for the base station to be connected next, the communication radio wave of the nearby base station lower than the communication base station is received, and the reception level is measured. From the measurement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B7/26H04L1/00H04W36/08H04W36/18H04W36/30
CPCH04L1/0041H04B7/2621H04W36/18H04L1/0048H04L1/0045H04B7/2628H04B7/2643H04W36/30H04L1/0042Y02D30/70
Inventor 安达文幸
Owner KOKUSA ELECTRIC CO LTD
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