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Cellular radio system allowing mobile station to perform communication through base station to which mobile station is connected over CDMA radio channel, and base station apparatus and mobile station apparatus which are used for cellular radio system

a technology of cellular radio and mobile station, which is applied in the direction of wireless communication, multiplex communication, wireless communication, etc., can solve the problems of affecting the use effect of traffic channels, and affecting the use effect of radio channels

Inactive Publication Date: 2002-03-07
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] It is an object of the present invention to provide a cellular radio system which can average the traffic channel occupancies of the respective radio frequencies, thereby allowing effective use of traffic channels.

Problems solved by technology

In this case, however, the occupancies of the traffic channels having the respective radio frequencies in the respective base stations may become uneven.
In this case, if an originating mobile station selects a radio frequency with dense traffic, the base station may be found busy in spite of the presence of an available channel, resulting in blocked communication.
In this case, even if an available channel is present, it takes a long period of time to form a radio path again.
As a result, speech communication may be interrupted or noise may be produced, deteriorating the speech communication quality.
Alternatively, the call may be dropped due to a handoff failure.

Method used

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  • Cellular radio system allowing mobile station to perform communication through base station to which mobile station is connected over CDMA radio channel, and base station apparatus and mobile station apparatus which are used for cellular radio system
  • Cellular radio system allowing mobile station to perform communication through base station to which mobile station is connected over CDMA radio channel, and base station apparatus and mobile station apparatus which are used for cellular radio system
  • Cellular radio system allowing mobile station to perform communication through base station to which mobile station is connected over CDMA radio channel, and base station apparatus and mobile station apparatus which are used for cellular radio system

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Embodiment Construction

[0034] An embodiment of the present invention will be described below with reference to the accompanying drawings.

[0035] FIG. 1 shows the schematic arrangement of a CDMA cellular radio system according to this embodiment. The apparent arrangement of this system is the same as that shown in FIG. 14. However, this system differs from that shown in FIG. 14 in the allocation of radio frequencies to base station groups BSa to BSc and the handoff control function of the system as follows.

[0036] The system of this embodiment has a total of six radio frequencies f1 to f6. The radio frequencies f1 and f2 are allocated to the base station group BSa; the radio frequencies f3 and f4, to the base station group BSb; and the radio frequencies f5 and f6, to the base station group BSc. Note that the radio frequencies f1 to f6 are respectively composed of upstream carriers fU1 to fU6 for transmitting signals from mobile stations MS (MS1 to MSm) to base stations BS (BS1 to BSm) and downstream carriers...

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Abstract

A CPU (42a) in each base station (BS) monitors the channel occupancy of each of a plurality of radio frequencies allocated to the base station (BS). When the difference between the channel occupancies of a plurality of radio frequencies allocated to a single base station (BS) becomes a predetermined state, the CPU (42a) switches the radio frequency as a candidate to be used by a predetermined base station (BS) of mobile stations (BS) that are present in the cell formed by the base station (BS) and set in the standby state to a radio frequency whose channel occupancy is in a predetermined state.

Description

[0001] The present invention relates to a cellular radio system such as a car / portable telephone system and a cordless telephone system and, more particularly, to a cellular radio system using a code division multiple access (CDMA) scheme as a radio access scheme between a base station and a mobile station, and a base station apparatus and mobile station apparatus which are used for the cellular radio system.[0002] A spread spectrum communication scheme, which is robust against interference and disturbance, has gained a great deal of attention as one of communication schemes used for a mobile communication system. The spread spectrum communication scheme is mainly used to implement a cellular radio system using CDMA scheme.[0003] In the cellular radio system using CDMA scheme, for example, the transmitting apparatus modulates digital speech data or digital image data by a digital modulation scheme such as PSK. This modulated transmission data is then converted into a broadband baseb...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J13/00H04B7/155H04B7/24H04W16/02H04W36/06H04W36/18H04W36/22H04W72/04H04W76/02
CPCH04W36/06H04W36/18H04W36/22H04W72/0486H04W72/52H04W72/04H04B7/155
Inventor MIMURA, MASAHIKO
Owner KK TOSHIBA
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