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Wireless base station, wireless communication system, and wireless communication method

a wireless communication system and wireless communication technology, applied in data switching networks, power management, high-level techniques, etc., can solve the problems of reducing the throughput of the entire wireless system, interfering between these signals, etc., and achieve the effect of preventing interference by pilot signals

Inactive Publication Date: 2015-09-17
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Prevents pilot signal interference, enhancing frequency utilization efficiency and improving throughput, area, and capacity performance in wireless communication systems.

Problems solved by technology

This may result in interference between these signals, disadvantageously.
Such interference leads to decreased throughput in the entire wireless system.

Method used

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  • Wireless base station, wireless communication system, and wireless communication method
  • Wireless base station, wireless communication system, and wireless communication method
  • Wireless base station, wireless communication system, and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(Configuration of Wireless Communication System)

[0030]FIG. 1 shows a configuration of a wireless communication system of an embodiment of the present invention.

[0031]Referring to FIG. 1, wireless base stations A-C are arranged. Here, zones z1, z2, z3 respectively represent ranges in which electric waves are delivered from wireless base stations A, B, C. Zone z1 of wireless base station A overlaps with zones z2, z3 of the other wireless base stations B, C. Hence, for example, when a wireless terminal #2 is communicating with wireless base station A, a signal received by wireless terminal #2 from wireless base station A has interference with a signal from wireless base station B. Wireless base stations A-C are connected to base station control center 1 via network cables 3.

(Configuration of Wireless Base Station)

[0032]FIG. 2 shows a wireless base station of the embodiment of the present invention.

[0033]Referring to FIG. 2, this wireless base station 2 includes a first antenna 10, a se...

second embodiment

Variation of Second Embodiment

[0102]FIG. 12 is a graph showing a relation between transmission power of the wireless terminal communicating with the wireless base station and a receive signal strength indicator (DL_RSSI) of the downlink signal transmitted from the wireless base station, the DL_RSSI being measured by the wireless terminal communicating therewith.

[0103]In FIG. 12, L5 is a curve when there is no interference. L6 is an exemplary curve when there is interference.

[0104]Interference determining unit 37 stores the relation provided by the curve of L5 in advance, in the form of a table or a mathematical expression.

[0105]Interference determining unit 37 calculates a normal value RR3 of the DL_RSSI, which is obtained in the case where there is no interference and corresponds to a value PO of the transmission power of the wireless terminal, which is received from the wireless terminal. The calculation is performed in accordance with the previously stored table or mathematical e...

third embodiment

[0106]An interference determining unit of a third embodiment is different from the interference determining unit of each of the first and second embodiments in terms of a method of determining whether or not there is interference.

(Operation)

[0107]FIG. 13 is a flowchart showing a procedure of an operation for control of transmission of the pilot signal and for control of switching of the communication level in the wireless base station of the third embodiment. The wireless base station performs the operation of the flowchart of FIG. 13 whenever a predetermined time elapses.

[0108]The flowchart of FIG. 13 is different from the flowchart of FIG. 9 in a step S310.

[0109]Specifically, when the wireless base station is not communicating with a wireless terminal (YES in step S100), interference determining unit 37 calculates a threshold value by subtracting a predetermined value from the DL_RSSI of the wireless base station. The DL_RSSI is received from the wireless terminal. When an adjacen...

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Abstract

When time at present is included in a high-traffic time period, an interference determining unit (37) determines that there is a possibility that a downlink signal to be received by any wireless terminal has interference with a pilot signal transmitted from a wireless base station. A pilot signal transmission control unit (40) controls the transmission of the pilot signal, which is included in an OFDMA frame or an OFDM frame. When it is determined that there is the possibility of interference, the pilot signal transmission control unit (40) stops the transmission of the pilot signal or reduces power of the pilot signal in a whole or a portion of a user data area.

Description

CROSS-REFERENCING[0001]The present application is a continuation of U.S. application Ser. No. 13 / 700,072, filed on Nov. 26, 2012, which claims the benefit of PCT Application No. PCT / JP2011 / 062113 filed on May 26, 2011, which claims the benefit of Japanese Application No. 2010-121889, filed on May 27, 2010. The content of each of the above applications is incorporated by reference herein in its entirety.TECHNICAL FIELD[0002]The present invention relates to a wireless base station, a wireless communication system, and a wireless communication method, in particular, a technique for control of transmission of a pilot signal used for estimation and / or synchronization of a channel.BACKGROUND ART[0003]In a wireless communication system, a plurality of communication devices transmit signals having the same frequency or frequencies close to each other. This may result in interference between these signals, disadvantageously. Such interference leads to decreased throughput in the entire wirel...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W72/08H04W28/02H04L12/26H04W72/54
CPCH04W72/082H04W28/0236H04L43/062H04W52/0229H04W52/143H04W52/244H04W52/325H04W52/386H04W52/0258Y02D30/70H04W72/541
Inventor MIYATA, TAKEO
Owner KYOCERA CORP
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