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Communication quality judgment method, mobile station, base station, and communications system

a technology of communication quality and mobile stations, applied in the field of communication quality judgment methods, mobile stations, base stations, communications systems, to achieve the effect of good uplink communication quality

Inactive Publication Date: 2011-01-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a mobile station that constructs a communications system using a CDMA method. More specifically, it focuses on a mobile station that estimates the quality of the uplink communication during a soft handover. The invention proposes an E-DCH (Enhanced DCH) technology to effectively use uplink radio resources and allocate them quickly. This technology introduces an AMC and HARQ technology, as well as a short transmission time interval, to optimize data transmission and improve the efficiency of packet transmission. The invention also addresses the issue of inefficient allocation of radio resources when transmitting burst data from a mobile station to a base station.

Problems solved by technology

Therefore, by taking a status in which the demand for uplink packet data transmission is increasing with the proliferation of the Internet into consideration, there arises a problem from the viewpoint of the effective use of radio resources.

Method used

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  • Communication quality judgment method, mobile station, base station, and communications system
  • Communication quality judgment method, mobile station, base station, and communications system
  • Communication quality judgment method, mobile station, base station, and communications system

Examples

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embodiment 1

[0058]FIG. 1 is an explanatory diagram showing the structure of a mobile communications system. In FIG. 1, a mobile station (UE: User Equipment) 100 is a moving communications device which the user uses, such as a mobile phone, a Personal Digital Assistant (PDA: Personal Digital Assistant), or a car telephone. The mobile station 100 transmits and receives data to and from a base station 101 via a radio channel. Each base station 101 controls the transmit power of a mobile station, carries out scheduling etc., and carries out a process of allocating a radio resource to the mobile station. A base station control apparatus (RNC: Radio Network Controller) 102 manages two or more base stations (Node Bs) 101, and relays transmission data from a core network (Core Network) not shown in the figure and transmission data from a mobile station. The combination of base stations 101 and the base station control apparatus 102 may be referred to as a UTRAN (Universal Terrestrial Random Access Netw...

embodiment 2

[0075]In accordance with embodiment 1, each base station broadcasts the amount I of interference to the mobile station using the BCH. As an alternative, each base station can broadcast the amount I of interference to the mobile station using a channel other than the BCH. Hereafter, an example in which each base station notifies the amount of interference using a channel other than the BCH will be explained. Concretely, an AG (Absolute Grant), an RG (Relative Grant), an over load, or the like can be provided as information associated with the amount of interference. Grant is notification of grant which is provided from a scheduler to the mobile station. The AG is a channel signal showing an absolute rate at which a plurality of bits are transmitted every 10 ms, and is piggybacked onto an E-AGCH (E-DCH Absolute Grant Channel). The RG is a channel signal in which one bit is transmitted every 2 ms or 10 ms in order to move a point relatively from the absolute value notified via the AG. ...

embodiment 3

[0078]An example of using an RG in order to notify the amount of interference from a base station to a mobile station will be explained hereafter. Also in the case of using an RG, an individual ID is set o each mobile station as in the case of using an AG. Furthermore, a group ID can also be used even in the case of using an RG. In the case of using an RG, orthogonal codes which are called Hadamard codes are used without using CRC in order to distinguish IDs from one another, unlike as in the case of using an AG. Because there is no CRC bit in an RG and IDs are distinguished from one another with Hadamard codes, it is difficult for each mobile station to judge whether an RG has been sent thereto compared with the case of using an AG. For this reason, it is desirable that RGs are always sent to mobile stations. FIG. 14 is a flow chart for explaining a process which is performed by a mobile station when the amount of interference is broadcasted thereto from a base station using an RG....

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Abstract

In order to carry out high-speed packet communications using a large-volume transmission channel like an E-DCH, uplink communication quality must be good. However, in a state in which a link imbalance occurs, a mobile station cannot estimate the uplink communication quality from downlink communication quality. Therefore, the mobile station calculates a path loss from the setting power of a common pilot channel which is notified from a base station, and the received power of the common pilot channel received thereby, and also estimates the received power in the base station on the basis of this path loss. The mobile station further judges the uplink communication quality by estimating the SIR in the base station by using the interference power notified from the base station and the estimated received power.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. Ser. No. 11 / 817,409 filed Aug. 30, 2007, the entire content of which is incorporated herein by reference. U.S. Ser. No. 11 / 817,409 is a National Stage of PCT / JP05 / 07538 filed Apr. 20, 2005.FIELD OF THE INVENTION[0002]The present invention relates to a mobile station which constructs a communications system to which a CDMA (Code Division Multiple Access) method is applied as a communication method. More particularly, it relates to a mobile station which estimates the uplink communication quality at the time of a soft handover.BACKGROUND OF THE INVENTION[0003]In recent years, plural telecommunications standards called third generation as high-speed CDMA mobile telecommunications methods are adopted as IMT-2000 by the International Telecommunications Union (ITU). According to the W-CDMA (FDD: Frequency Division Duplex) standard which is one of the plural telecommunications standards, commercial serv...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/00H04B1/707H04B1/7097H04W24/00H04W72/54
CPCH04B7/022H04B17/336H04W72/085H04W72/042H04W72/542H04W72/23
Inventor WAKABAYASHI, HIDEJISUGISAWA, KOUTAROU
Owner MITSUBISHI ELECTRIC CORP
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