Base station, mobile station, communication system, and communication method

a technology of communication system and transmission power, applied in power management, radio transmission, electrical equipment, etc., can solve the problems of hs-pdschs's total transmitting power exceeding, and the assignment is not easy, and achieves the effect of ensuring communication quality

Inactive Publication Date: 2008-06-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach secures communication quality by ensuring that the total transmitting power of HS-PDSCHs does not exceed the permitted limit, reducing transmission errors and improving system efficiency through controlled power assignment and CQI correction.

Problems solved by technology

Therefore, if assignment of mobile stations by a scheduler is not properly carried out, this may result in improper assignment, in that the total of transmitting powers of HS-PDSCHs of a base station may exceed the permitted power.

Method used

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  • Base station, mobile station, communication system, and communication method
  • Base station, mobile station, communication system, and communication method
  • Base station, mobile station, communication system, and communication method

Examples

Experimental program
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first embodiment

[0023]A first embodiment is explained with reference to FIG. 1, FIG. 2, and FIG. 3.

[0024]FIG. 1 is a system configuration diagram of the first embodiment of the invention.

[0025]A mobile communications system of this first embodiment includes a radio network controller (hereinafter, RNC) 1, a base station 2, and a plurality of mobile stations 3 that communicate with the base station 2.

[0026]The base station communicates with each mobile station 3 via a shared channel referred to as a high-speed physical downlink shared channel (HS-PDSCH) and a common channel referred to as common pilot channel (CPICH), in addition to individual channels unique to the respective mobile stations.

[0027]The RNC 1 includes a transmission data storage unit 4, a mobile station power assignment setting unit 5 that sets a power offset Γ of HS-PDSCH power to be transmitted to each mobile station 3 from the base station 2 with respect to the CPICH power, and a code resource number setting unit 6 that sets a max...

second embodiment

[0052]A second embodiment is an extended function of the first embodiment.

[0053]In the first embodiment, the total of the powers to be assigned to the mobile stations is 70%, and 10% remains until the predetermined power. Therefore, the scheduler 8 redistributes the residual to the mobile station assigning powers to further reduce transmission errors. Namely, ultimately, transmitting power of “40%×80% / 70%=45.7%” is assigned to the mobile station a, and transmitting power of “30%×80% / 70%=34.3%” is assigned to the mobile station b.

[0054]In this embodiment, the powers to be assigned to HS-PDSCHs of the respective mobile stations are thus increased according to the ratio of the predetermined power of the base station and the sum of the initial assigning powers (in the example given above, 40% and 30%). Thus, the HS-PDSCH transmitting power of the base station can be used in just proportion, transmission errors are reduced, and the communication quality of the communication system improv...

third embodiment

[0055]A third embodiment is an extended function of the first embodiment.

[0056]In the first embodiment, the total of powers to be assigned to the mobile stations is 70%, and there is a 10% residual until the predetermined power. Therefore, the scheduler 8 redistributes the residual to the power to be assigned to a specific mobile station, to further reduce transmission errors. For example, transmission is performed upon ultimately assigning the power of “40%+10%=50%” to the mobile station a.

[0057]To decide the mobile station whose HS-PDSCH power is to be increased, the scheduler 8 determines the priorities in advance.

[0058]In addition to redistributing the whole residual to one mobile station, it is also possible that, for example, the residual is divided equally and redistributed to a plurality of mobile stations.

[0059]In this embodiment, by increasing the HS-PDSCH assigning power of a mobile station, it becomes possible to use the HS-PDSCH transmitting power of the base station in...

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Abstract

A base station communicates with plural mobile stations using a common channel common to the mobile stations, and a predetermined number of a plurality of shared channels assigned to the mobile stations. The base station includes a scheduler that acquires, for each of the mobile stations, a transmitting power ratio being a ratio of a mobile station assigning power, which is a sum of transmitting powers of the shared channels assigned to the mobile station, and a transmitting power of the common channel. The scheduler determines the mobile station assigning power of the mobile station and then selects communication destination mobile stations, so that a sum of the mobile station assigning powers does not exceed a predetermined maximum assignable power.

Description

CROSS-REFERENCES TO RELATED APPLICATION[0001]This application is a divisional application of U.S. application Ser. No. 10 / 556,730, filed Nov. 14, 2005, which is a National Stage of PCT / JP04 / 06811, filed May 13, 2004, and claims the benefit of priority under 35 U.S.C. § 119 of Japanese Application No.2003-138888, filed May 16, 2003. The entire contents of the above-identified applications are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a technique of controlling transmitting power between a base station and a mobile station.BACKGROUND ART[0003]Recently, mobile terminals (mobile stations) such as cell phones have been increasingly made multimedia-compatible for handling a large amount of still images and short-period moving images, and accordingly, large-capacity high-rate data transmission methods are in demand. Examples of such large-capacity high-rate data transmission methods are the high speed downlink packet access (HSDPA) method, and d...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04B7/00H04B7/26H04B7/005H04W52/16H04W52/32
CPCH04W52/322H04W52/16
InventorYAMAZAKI, TAKAHIKOTAKANO, MICHIAKIFUJIE, RYOICHI
OwnerMITSUBISHI ELECTRIC CORP