Base station and transmission power determining method in mobile communications systems

A technology of mobile communication system and transmission power, which is applied in the mobile station transmission power control method and the field of base station and adjacent cell interference tolerance, which can solve the problems of system throughput reduction, large attenuation of received signal, increase of transmission power, etc., to achieve The effect of increasing throughput

Inactive Publication Date: 2005-05-11
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Especially in the uplink, there is the following so-called near-far problem: For example, when multiple mobile stations transmit signals with the same transmission power, the attenuation of the received signal due to propagation loss generally occurs as the farther away from the base station The larger the value is, so, at the input of the base station receiver, the received signal from the mobile station located far away from the base station (i.e., around the cell end) is shielded by the received signal from the mobile station close to the base station
[0010] However, there is a problem that if a large interference margin is increased, the transmission power increases and the system throughput decreases

Method used

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  • Base station and transmission power determining method in mobile communications systems
  • Base station and transmission power determining method in mobile communications systems
  • Base station and transmission power determining method in mobile communications systems

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Embodiment

[0034] Fig. 1 is a schematic diagram of a mobile communication system to which the present invention can be applied. In the mobile communication system shown in FIG. 1 , a plurality of mobile stations 13 exist in a wireless area (cell) 12 forming a wireless base station 11 . Packet transmission is performed between the base station 11 and the affiliated mobile station 13, and the transmitted packets are subjected to code division multiple access in the wireless section, and the transmission time is divided into time slots.

[0035] FIG. 2 is a block diagram of the wireless base station 11 and the mobile station 13 according to an embodiment of the present invention. As shown in FIG. 2 , the mobile station 13 includes a reception unit 21 , a reception signal conversion unit 22 , a signal analysis unit 23 , a transmission power control unit 24 , a transmission signal conversion unit 25 , and a transmission unit 26 .

[0036]

[0037] The receiving unit 21 is a circuit for rec...

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Abstract

A base station and a communication method in a wireless packet communication system. By setting the interference tolerance only for the interference of adjacent cells, the throughput of the system is increased. The base station is composed of the following parts: a receiving unit, which receives a signal from the mobile station; a receiving strength measuring unit, which measures the received power strength of the received signal; The receiving power in the local cell of the mobile station within the mobile station is used to calculate the adjacent cell interference; the interference margin determination unit is configured to set the adjacent cell interference margin for the interference from the adjacent cell; the local cell group allocation unit, which assigns a grouping specification value for a local cell grouping; and a transmission power determining section which considers a packet propagation loss in the to determine the transmit power of the mobile station.

Description

technical field [0001] The present invention relates to a base station which controls the transmission power of a mobile station and a method for setting the transmission power of a mobile station in a mobile communication system, and particularly relates to an adjacent cell interference margin (margin) which only considers interference from adjacent cells. ) mobile station transmission power control method and base station. Background technique [0002] In a mobile communication system using CDMA (Code Division Multiple Access: Code Division Multiple Access), it is measured that the reception quality (BER: Bit Error Rate) or Block Error Rate (BLER: By applying high-speed transmission power control (TPC: Transport Format Combination Indicator) based on this measurement to the uplink The road and the downlink can make the transmission power usually correspond to the required reception quality to the minimum, therefore, the capacity of the system can be increased. [0003] E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/26H04J13/00H04W24/00H04W28/00H04W52/04H04W52/14H04W52/22H04W52/24H04W52/26H04W52/28
CPCH04W52/146H04W52/244H04W52/267H04W52/286
Inventor 邱恒加山英俊梅田成视
Owner NTT DOCOMO INC
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