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Communication terminal and base station selection method

A technology for communication terminals and base stations, which is applied in the direction of selection devices, wireless communication, and communication between multiple stations, etc. It can solve the problems of low transmission rate of communication terminals, data retention, and deterioration of video content quality, etc.

Inactive Publication Date: 2005-03-30
KYOCERA CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0021] At this time, when the number of communication terminals accommodated in the second base station and communicating with the second base station is greater than the number of communication terminals communicating with the first base station, if the handover is judged and implemented based on the quality of the received signal, all the communication terminals in the base station Under the influence of the above scheduling, the transmission rate between the second base station and the handover communication terminal will become lower after the handover
If such a decrease in the transmission rate occurs, there will be a difference between the transmission rate of the streaming server (video streaming server) and the transmission rate of the wireless section, causing data retention in the base station, and causing a problem due to data generation in the communication terminal. Latency that degrades the quality of video content being played

Method used

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  • Communication terminal and base station selection method
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  • Communication terminal and base station selection method

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no. 1 Embodiment approach

[0050] The outline of the base station selection method of the present invention and a communication terminal using the method will be described.

[0051] Embodiments of the present invention relate to a communication terminal that selects a base station corresponding to a communication target from among the base stations in an environment capable of communicating with a plurality of base stations. This communication terminal is a communication terminal compatible with the EV-DO system. The communication terminal according to this embodiment receives pilot signals from a plurality of base stations, and derives a DRC corresponding to each base station. In addition, the number of terminals communicating with each base station is acquired. In addition, the communication terminal calculates the expected communication speeds corresponding to the plurality of base stations according to the DRC and the number of terminals, and determines the base station with the highest expected co...

no. 2 Embodiment approach

[0080] Next, the outline of the operation at the time of handover of the communication terminal of the present invention will be described. The communication system used by the communication terminal of the present invention uses an adaptive modulation method that determines the connection time and modulation method based on the DRC from each communication terminal connected to the base station, and performs scheduling according to the number of terminals connected in the same cell to share bandwidth. Best-Effort (Best-Effort) type wireless packet data communication system, etc.

[0081] In the communication terminal of the present invention, when the communication signal quality of the base station in communication becomes weak, for example, when the radio wave condition becomes weak, it becomes a situation that scheduling is expected to occur. Information about the number of communication terminals (the number of accommodated communication terminals). Then, the communicatio...

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Abstract

A communication unit adapted to the EV-DO standard communicates with a base station. An acquisition unit acquires the number of communication terminals in communication with the base station. A derivation unit measures the CIR from the received pilot signal to derive a DRC value corresponding to the measurement result. A storage unit stores the number of communication terminals obtained from the acquisition unit and the CRC value derived from the derivation unit. A calculation unit calculates an estimated communication rate based on the maximum transmission rate with the base station corresponding to the DRC value, the maximum DRC value, the derived DRC value from the derivation unit, and the number of communication terminals. A comparison unit selects a base station having a high estimated communication rate as a base station to communicate.

Description

technical field [0001] The present invention relates to a communication terminal and a base station selection method for selecting a base station to be communicated from among a plurality of base stations. [0002] Also, the present invention relates to a communication terminal that avoids image or audio data quality deterioration by performing handover (switching of base stations) while running applications (for example, video downloads or streaming services, etc.). Background technique [0003] In recent years, communication terminals such as mobile phones, with the enhancement of communication terminal functions, have added communication terminals capable of sending and receiving data such as portraits or animation images to the existing voice call service. Various applications such as video download services and streaming services have also begun to be provided. With the diversification of such applications, it is required to transmit a larger amount of data in the down...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L12/56H04W24/00H04W36/30H04W48/20
CPCH04W48/20H04W24/00H04W36/30H04W36/304H04W24/08H04W36/08
Inventor 筑地宏河野健治
Owner KYOCERA CORP
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