Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Mobile Communication System, Base Station Device and Frequency Allocation Method for Mobile Communication System

a mobile communication system and frequency allocation technology, applied in multiplex communication, orthogonal multiplex, wireless commuication services, etc., can solve the problems of reducing the frequency utilization efficiency, deteriorating communication quality, and lowering communication throughput, so as to improve both frequency utilization efficiency and throughput, reduce the number and bandwidth of guard bands provided between the frequency bands, and improve the effect of frequency utilization efficiency

Inactive Publication Date: 2012-07-19
KYOCERA CORP
View PDF18 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention has been made in view of the conventional problems described above. It is an object of the present invention to provide a mobile communication system, a base station device and a frequency allocation method for the mobile communication system, which enable appropriate frequency allocation while improving both frequency utilization efficiency and throughput in OFDMA radio communication.
[0014]According to the present invention, in the base station device, the multiple allocatable frequency bands are stored in association with the predetermined conditions related to the communication quality. Then, based on communication quality in communication with each of the mobile station devices, a frequency band to be allocated to the mobile station device is selected. Moreover, channel information indicating the selected frequency band is notified to the mobile station device. Then, the mobile station device notified of the channel information by the base station device communicates with the base station device in the frequency band indicated by the channel information. According to the present invention, in OFDMA radio communication, multiple allocatable frequency bands can be appropriately associated with the conditions related to the communication quality. Thus, on the basis of the communication quality in communication with each of the mobile station devices, appropriate frequency allocation can be performed while improving both frequency utilization efficiency and throughput.
[0015]Moreover, according to one aspect of the present invention, a guard band having a predetermined width according to the communication quality is provided between the frequency bands stored in the frequency band storage unit. Thus, the number and bandwidth of the guard bands provided between the frequency bands can be reduced. Consequently, the frequency utilization efficiency can be improved. Moreover, the frequencies in a portion where no guard bands are provided between the frequency bands can be allocated to the mobile station device which performs high quality communication since ICI is unlikely to occur. Meanwhile, the frequencies in a portion where the guard bands having a proper bandwidth according to the quality are provided can be allocated to the mobile station device which performs low quality communication since ICI is likely to occur. Thus, the throughput can be improved while suppressing a data error rate.

Problems solved by technology

Thus, communication quality is deteriorated.
Accordingly, although the communication throughput is improved, there is a problem that the frequency utilization efficiency is lowered.
Meanwhile, when data retransmission or error correction is performed instead of providing the guard bands, the frequency utilization efficiency is improved but a problem of lowering the communication throughput arises.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Mobile Communication System, Base Station Device and Frequency Allocation Method for Mobile Communication System
  • Mobile Communication System, Base Station Device and Frequency Allocation Method for Mobile Communication System
  • Mobile Communication System, Base Station Device and Frequency Allocation Method for Mobile Communication System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030]With reference to the drawings, an embodiment of the present invention will be described below. FIG. 5 shows a configuration of a mobile communication system 10 according to the embodiment of the present invention. The mobile communication system 10 includes at least one base station device 12 and multiple mobile station devices 14.

[0031]FIG. 6 is a functional block diagram of the base station device 12. As shown in FIG. 6, the base station device 12 includes a controller 20, a radio communication unit 30 and a line interface 40. The base station device 12 transmits and receives radio signals by OFDMA to and from each of the multiple mobile station devices 14, and also transmits and receives packets to and from each of multiple other base station devices through the line interface 40.

[0032]The radio communication unit 30 includes an antenna 31, a transmitter 32, a receiver 33, an OFDM modulator 34, an OFDM demodulator 35, a signal processor 36 and a communication quality acqui...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a base station device 12 of an OFDMA mobile communication system, a frequency band storage unit 22 stores multiple frequency bands allocatable to mobile station devices, respectively, in association with predetermined conditions related to communication quality. A communication quality acquisition unit 37 acquires communication quality in communication with each of the mobile station devices. A frequency allocator 24 selects any one of the frequency bands from the frequency band storage unit 22 on the basis of the communication quality acquired by the communication quality acquisition unit 37, and notifies the mobile station device of channel information indicating the selected frequency band. Then, the mobile station device communicates with the base station device 12 in the frequency band indicated by the channel information notified by the frequency allocator 24 in the base station device 12.

Description

TECHNICAL FIELD[0001]The present invention relates to a mobile communication system, a base station device and a frequency allocation method for the mobile communication system. In particular, the present invention relates to a mobile communication system for performing communication by orthogonal frequency division multiplexing, a base station device and a frequency allocation method for the mobile communication system.BACKGROUND ART[0002]OFDM (Orthogonal Frequency Division Multiplexing) is one type of multicarrier modulation method and is a method for performing communication by transmitting divided data on multiple subcarriers which are orthogonal to each other. Each of the subcarriers is modulated by QPSK (Quadrature Phase Shift Keying), QAM (Quadrature Amplitude Modulation) or the like. When the subcarriers are orthogonal to each other, each of the subcarriers has a frequency in which the power of the other subcarriers is set to zero as shown in FIG. 1. Thus, the subcarriers ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): H04W72/08H04W68/00H04W88/08
CPCH04L5/0037H04L5/006H04L5/0094H04W88/08H04W72/0453H04W72/085H04W68/00H04W72/542H04J11/005
Inventor MURAKAMI, YOUHEINISHIKIDO, MASAMITSUNAKANO, TAKESHIOOTSUKI, YUTAKA
Owner KYOCERA CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products