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Radio communication system and radio communication method

A wireless communication system and wireless communication technology, applied in the field of wireless communication systems, can solve problems such as large space power attenuation, achieve the effects of efficient communication, ensure transmission speed, and fast transmission speed

Active Publication Date: 2009-08-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in general, millimeter-wave bands have larger power attenuation in space than microwave bands, so there are problems such as limited communication areas, usage environments, and applications.
[0008] In addition, in the above-mentioned conventional wireless communication systems, the purpose of fast transmission rate, security of privacy, etc. is not aimed at

Method used

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  • Radio communication system and radio communication method

Examples

Experimental program
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Embodiment 1

[0038] refer to Figure 1 to Figure 7 as well as Figure 10 A wireless communication system according to Embodiment 1 of the present invention will be described. figure 1 It is a diagram showing the configuration of a wireless communication system according to Embodiment 1 of the present invention. In addition, in each figure from now on, the same code|symbol represents the same or a corresponding part.

[0039] exist figure 1 In the wireless communication system of the first embodiment, a base station 1 and a plurality of (for example, three) terminals 2 are provided. A base station 1 is installed, for example, on the ceiling of a building, and a terminal 2 such as a personal computer having an antenna is installed on the floor of the building. The spatial arrangement of the base station 1 and the terminal 2 is not limited to this. The base station 1 can also be arranged on a side wall of a building. In addition, the two can be turned upside down, for example, the bas...

Embodiment 2

[0084] refer to Figure 8 A radio communication system according to Embodiment 2 of the present invention will be described. Figure 8 It is a diagram showing the frame structure of the wireless communication system according to Embodiment 2 of the present invention. In addition, the configuration of the wireless communication system of the second embodiment is the same as that of the first embodiment described above.

[0085] The base station 1 that has received the communication establishment request from the terminal 2 through the request channel (Request ch) including the antenna element number determines the connection time of the antenna element 13 based on the quality of service requested from each terminal 2, desired frequency band, communication time, etc., The connection interval determines the channel allocation time for communicating with each terminal 2 that has received the request. In addition, the base station 1 determines the modulation method and the radio ...

Embodiment 3

[0089] refer to Figure 9 A wireless communication system according to Embodiment 3 of the present invention will be described. Figure 9 It is a diagram showing an example when interference occurs between sectors in the radio communication system according to Embodiment 3 of the present invention. In addition, the configuration of the wireless communication system of the third embodiment is the same as that of the first embodiment described above.

[0090] Such as figure 1 As shown, in the case where a plurality of beam antennas 11 adopt a sector structure, by repeatedly using the same frequency in the same wireless communication area and spreading them planarly, a wider area can be formed. At this time, when the directivity of the antenna 23 used in the terminal 2 is wide-angle, even when the distance between the sectors is increased, interference may occur between the sectors.

[0091] Figure 9 (a) shows the structure of seven sectors of a plurality of beam antennas 1...

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PUM

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Abstract

A base station of a radio communication system emits a radio wave having the same frequency by time division toward a plurality of specific areas from a plurality of antenna elements by using a multiple-beam antenna to form a plurality of spot beams, and transmits broadcast information through a plurality of beacon channels. Upon reception of the broadcast information, a terminal that exists in any one of the plurality of specific areas selects an optimum beacon channel, and transmits a communication establishment request and a bandwidth request to the base station through a request channel corresponding to information for identifying the antenna element, which is included in the broadcast information received through the selected optimum beacon channel. Upon reception of the requests, the base station schedules, when a channel is to be allocated, a channel allocation time including downlink and uplink data bandwidths and the like.

Description

technical field [0001] The present invention relates to a wireless communication system and a wireless communication method in which a base station communicates wirelessly with a plurality of terminals, and relates to a wireless communication system and a wireless communication method in which a base station has a plurality of directional antennas and ensures communication time only in specific areas where terminals exist . Background technique [0002] Most antennas used in conventional wireless LAN (Local Area Network) systems and ultra-wideband (UWB: Ultra Wide Band) wireless systems have relatively wide-angle directivity depending on the characteristics of frequency bands used in the systems. Therefore, applications that can be used and environments that can be supported are also various, and it is expected that they will spread in the future. However, in recent years, there has been an increasing demand for higher transmission speeds in wireless communications, and res...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W72/12H04W76/04
CPCH04L5/0078H04L27/0006H04B7/0802H04W48/12H04L5/0094H04B7/0408H04W16/28H04B7/0695H04B7/061H04W72/04H04B7/088H04W72/042H04L5/0037H04W72/23H04B7/063H04B7/0632H04B7/0639H04W48/08H04W72/20
Inventor 山内尚久永井幸政平明德
Owner MITSUBISHI ELECTRIC CORP
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