Mobile communicaton controlling apparatus and inter-frequency handover control method

Abstract

A mobile communication controlling apparatus for controlling inter-frequency handover includes a required quality identifying unit configured to identify a quality required for data addressed to a mobile station, a transmission rate control unit configured to control a data transmission rate of a higher layer based on the identification result supplied from the required quality identifying unit, and an inter-frequency handover instruction unit configured to temporarily suspend signal transmission from a radio base station connected to the mobile communication controlling apparatus and allow the mobile station to perform inter-frequency measurement.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a Continuation of and claims the benefit of priority under 35 U.S.C. § 120 from U.S. Ser. No. 10 / 820,859, filed Apr. 9, 2004, and claims the benefit of priority under 35 U.S.C. § 119 from Japanese Patent Application No. 2003-106817 filed Apr. 10, 2003, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a mobile communication controlling apparatus and an inter-frequency handover control method that allow a mobile station to correctly perform inter-frequency handover even in the real-time media servicing environment.[0003]Third generation mobile systems, which conform to the proposed IMT-2000 standards, are discussed in the 3GPP (the Third Generation Partnership Project) Technical Specifications and Technical Reports.[0004]One of the proposed IMT-2000 standards for third generation mobile networks is a WCDMA based standard. In WCDMA, ...

AI Technical Summary

Benefits of technology

The present invention aims to provide a mobile communication controlling apparatus and a handover control method that can allow a mobile station to smoothly handover between different networks without causing delay in real-time media services. The apparatus includes a required quality identifying unit, a transmission rate control unit, and an inter-frequency handover instruction unit. The required quality identifying unit determines the quality of data addressed to the mobile station and sends the information to the transmission rate control unit. The transmission rate control unit then adjusts the data transmission rate based on the quality requirements of the traffic. This helps to reduce data delay during inter-frequency handover and ensures correct performance of real-time media services. The inter-frequency handover control method involves detecting a trigger for handover, identifying the quality of data transmitted to the mobile station, reducing the data transmission rate of a higher layer, and temporarily suspending signal transmission from the radio base station to allow the mobile station to perform inter-frequency measurement. Overall, this invention helps to improve the reliability and efficiency of mobile communication in various network environments.

Problems solved by technology

However, in considering concomitance with existing systems, handover between different carrier frequencies (including handover to another cell using a different frequency in the same system and handover to a cell of another system) is required.

Accordingly, the amount of transmittable data is reduced in the meanwhile, and data transmission delays occur.

For this reason, the compressed mode is unsuitable for streaming services (for downloading data and immediately reproducing the arriving data), such as Internet broadcasts, that do not accept variation or fluctuation in delay.

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