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Wireless communication system using CDMA communication method

A radio unit, CDMA communication technology, applied in the direction of code division multiplexing system, wireless communication, multiplexing communication, etc., can solve problems such as high system pressure and low sound quality

Inactive Publication Date: 2004-09-01
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the pilot pollution state, soft H / O is performed frequently, thereby degrading the sound quality
Additionally, this frequent soft H / O creates problems with overstressing the system

Method used

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  • Wireless communication system using CDMA communication method
  • Wireless communication system using CDMA communication method
  • Wireless communication system using CDMA communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The following description will explain a method of controlling the transmission power of a pilot signal in a CDMA communication method according to an embodiment of the present invention. However, it should be understood that the following examples are for illustrative purposes only, and the present invention is not limited thereto.

[0054] First, refer to Figure 7 with 8 , illustrating the arrangement of the control system for the transmission power of the pilot signal in the CDMA communication method according to an embodiment of the present invention.

[0055] Figure 7 The arrangement of the control system of the pilot signal transmission power in the CDMA communication method according to one embodiment of the present invention is shown.

[0056] As shown in the figure, BTS 20 includes: an RX unit 21 for receiving and demodulating a radio signal 2; a decoder 23 for decoding the demodulated signal into a voice control frame signal 70; The speech frame signal 5...

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PUM

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Abstract

The present invention has an object to secure a satisfactory reception environment efficiently regardless of a degree of the traffic intensity. The object is achieved by the following. A pilot power control unit is provided to a base station radio unit. The pilot power control unit controls a desired wave power-to-interference wave power ratio of a pilot signal to stay at a preset value. More specifically, upon receipt of a multiplex wave from a multiplexing unit, the pilot power control unit computes a desired wave power-to-interference wave power ratio of a pilot signal. Then, the pilot power control unit transmits a command signal to a coder to change a transmission power value of the pilot signal in an amount corresponding to a difference between the computed desired wave power-to-interference wave power ratio and a set desired wave power-to-interference wave power ratio.

Description

technical field [0001] The present invention relates to a wireless communication system using a CDMA (Code Division Multiple Access) communication method conforming to the IS-95 standard, and more particularly, to the transmission power control of a base station radio unit in the wireless communication system. Background technique [0002] The method of connecting multiple mobile stations to one base station in the same frequency band is called multiple access or multiple access. With the CDMA (Code Division Multiple Access) communication method, multiple access is performed by spread spectrum communication. Spread spectrum communication is a communication method that transmits information signals by extending the frequency spectrum of information signals to a bandwidth that is sufficiently wider than the original information bandwidth. [0003] Each information signal is assigned a mutually orthogonal spreading code sequence. Each information signal is multiplied by the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/04H04B7/005H04B7/26H04J13/00H04W52/24H04W52/32
CPCH04W52/40H04W52/50H04W52/246H04W52/241H04W52/32H04W52/325H04W52/143H04W52/24H04B7/26
Inventor 高野真树
Owner NEC CORP