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Communication method using directional beam and radio base station

A directional beam and wireless base station technology, applied in the field of wireless base stations, can solve the problems of wireless link disconnection and uplink signal interval extension, and achieve the effect of avoiding disconnection

Inactive Publication Date: 2004-05-26
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it is assumed that the mobile station 2 mainly performs data reception during packet data communication, and this will cause the interval of uplink signals transmitted by the mobile station 2 to be extended
Therefore, in this case, there is a high probability that the wireless link is down

Method used

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  • Communication method using directional beam and radio base station
  • Communication method using directional beam and radio base station
  • Communication method using directional beam and radio base station

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036] A first embodiment of the present invention will now be described with reference to the drawings. Figure 4 An explanatory diagram showing an example of a communication system using directional beams is shown.

[0037] Such as Figure 4 As shown in , the communication system according to this embodiment is a system for wireless communication between the mobile station 2 and the base station 1 in a sub-cell structure. Base station 1 communicates wirelessly with mobile station 2 using directional beams BP1 and BP2. By the way, in Figure 4In this example, a signal for uplink, ie, an uplink signal, is received at base station 1, and a directional beam BP1 is formed at base station 1 according to an antenna weight determined by an antenna weight optimization algorithm. Wireless communication is then performed between the mobile station 2 and the base station 1 . Further speaking, the directional beam basically does not change at the base station 1 until a new uplink sig...

no. 2 example

[0053] Hereinafter, a second embodiment of the present invention will be described. Figure 8 is an explanatory diagram showing an example of a directional beam pattern according to the second embodiment. similar to Figure 4 , Figure 8 A situation is shown in which no uplink signal is transmitted by the mobile station 2 within a specified period of time starting when the base station 1 forms a directional beam for the mobile station 2 .

[0054] The second embodiment is characterized in that the timer threshold storage unit 16 stores several timer thresholds, and when the uplink signal interval exceeds each timer threshold, the antenna weights are changed step by step, so as to gradually expand the directional The width of the beam pattern.

[0055] Specifically, several timer thresholds ( T1 , T2 and T3 , T1 Figure 8 As shown in , then base station 1 expands the width of the directional beam pattern from BP7 to BP9 step by step. The base station 1 extends the width so a...

no. 3 example

[0063] Hereinafter, a third embodiment of the present invention will be described. FIG. 11 is an explanatory diagram showing an example of a directional beam pattern according to the third embodiment. Similar to the first and second embodiments, FIG. 11 shows a situation where no uplink signal is transmitted by the mobile station 2 within a specified period of time when the base station 1 forms a directional beam for the mobile station 2 started.

[0064] The third embodiment is characterized in that when the uplink signal interval (τ) exceeds the timer threshold, the base station 1 changes the antenna weights so as to expand the width of the directional beam pattern, and if the directional beam pattern is being extended by the base station 1 If the uplink signal is received at the same time, the width of the directional beam pattern is further changed by changing the antenna weight according to the antenna weight optimization algorithm.

[0065] Figure 10 A flowchart for ...

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Abstract

To avoid disconnection of a radio link between a base station adopting transmission / reception of directional beams and a mobile station even when the mobile station moves while transmitting no up signals. The base station comprises: an array antenna 11 to transmit / receive the directional beam; a transceiver 12 to receive an up signal from a mobile station 2 and to generate a directional beam pattern unique to each mobile station according to an antenna weight provided to each mobile station 2; an up signal interval measurer 13 to measure time elapsed from the reception of the up signal; and an antenna weight generator 15 to change the antenna weight on the basis of the result of the measurement.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Japanese Priority Patent No. P2002-314975 filed on October 29, 2002, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a communication method using directional beams, and a wireless base station, which adopts spectrum excursion to perform wireless communication according to the sector-cell structure of the Code Division Multiple Access (CDMA) scheme. More specifically, the present invention relates to a communication method and a wireless base station that perform transmission / reception of directional beams using several antennas. Background technique [0004] Generally, as a mobile communication system, a cellular system covering a service area uses a plurality of radio base stations corresponding to a plurality of cells. Furthermore, a small sub-area structure is used, which divides one ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H01Q1/24H04B7/10H04B7/26H04W16/28
CPCH01Q1/246H04W16/28
Inventor 安尼尔尤米西田中晋也中村武宏大川耕一
Owner NTT DOCOMO INC