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Base station device, communication terminal and transmission power control method

A technology for transmission power control and communication terminals, which is applied to communication between multiple stations, power management, wireless communication, etc., and can solve problems such as signal quality degradation and other user interference

Inactive Publication Date: 2001-10-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the signal quality deteriorates greatly until the transmission power returns to the ideal value, or the signal quality is excessively higher than the expected quality, causing great interference to other users

Method used

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  • Base station device, communication terminal and transmission power control method
  • Base station device, communication terminal and transmission power control method
  • Base station device, communication terminal and transmission power control method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] figure 1 It is a block diagram showing the structure of the base station apparatus according to Embodiment 1 of the present invention. exist figure 1 Among them, the signal from the communication terminal device received via the antenna 101 is subjected to predetermined processing such as frequency conversion by the wireless receiving unit 102 . The reception signal after the above-mentioned predetermined processing is demodulated by the demodulation unit 103 . The demodulated signal is obtained as UL reception data and sent to the SIR measurement unit 104 .

[0031] In the SIR measurement unit 104, SIR is measured from the demodulated signal. The measured SIR is compared with the UL target SIR in the comparison unit 105 . Specifically, subtraction processing is performed between the measured SIR and the UL target SIR. That is, in the comparison unit 105 , the extent to which the measured SIR deviates from the target (ideal) SIR is determined.

[0032] The subtrac...

Embodiment 2

[0064]In this embodiment, a case will be described in which a known signal is transmitted from a base station device to a communication terminal device using a time slot before resumption of transmission, and transmission power control information obtained from the quality of the known signal is transmitted from the communication terminal device. The base station apparatus performs transmission power control capable of compensating for a difference between downlink signal quality and downlink desired quality based on the transmission power control information.

[0065] The base station apparatus and communication terminal apparatus in this embodiment have the same configuration as that of Embodiment 1, and therefore description thereof will be omitted.

[0066] The transmission power control method performed by the base station apparatus and the communication terminal apparatus of this embodiment will be described below. Here, a case will be described in which the period in wh...

Embodiment 3

[0083] In this embodiment, the following case is described: using a channel common to all users, such as a known signal of a common pilot channel, and a known signal of an individual physical channel in a compressed mode, such as a pilot signal, these known signals The transmission power ratio of the known signal is used to perform transmission power control capable of compensating for the difference between the downlink signal quality and the downlink desired quality based on the transmission power control information.

[0084] The base station apparatus in this embodiment has the same configuration as that in Embodiment 1, and therefore its description is omitted. use Figure 10 The configuration of the communication terminal device of this embodiment will be described.

[0085] exist Figure 10 Among them, the signal from the base station apparatus received via the antenna 1001 is subjected to predetermined processing such as frequency conversion by the radio receiving un...

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Abstract

Transmission power commands are fed on up link signals before one slot after estimation of transmission power of a down link just before return for convergence of transmission power values in a first slot into an ideal transmission power value at restart of transmission after suspension. Thereby, it may be realized that a converging rate of the above transmission power values is improved; signal quality of related users sides is improved, or interference power with signals of other users except the above users is reduced.

Description

technical field [0001] The present invention relates to a base station device, a communication terminal device, and a transmission power control method used in a digital wireless communication system. Background technique [0002] The CDMA (Code Division Multiple Access) method is one of the multiple access method technologies when a plurality of stations simultaneously communicate using the same frequency band in mobile communications such as car phones and mobile phones. As other techniques, FDMA (Frequency Division Multiple Access) and TDMA (Time Division Multiple Access) are known, but CDMA is capable of achieving higher frequencies than these techniques. A way to utilize efficiency and accommodate more users. [0003] In the CDMA method, since a plurality of users share the same frequency band, a certain user's signal is an interference signal to other users, and the signals of other users are also interference signals to the user. Therefore, in order to obtain unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/00H04B7/005H04B7/26H04W24/00H04W52/04H04W52/08H04W52/22H04W52/28H04W52/44
CPCH04W52/288H04W52/44H04W52/228Y02B60/50
Inventor 上杉充加藤修
Owner PANASONIC CORP
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