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Radio communication device and semiconductor integrated circuit device used for the same

a radio communication and integrated circuit technology, applied in power management, error detection/prevention using signal quality detectors, high-level techniques, etc., can solve the problems of long time to determine each channel condition, inability to know the degree of actual affection of measured radio waves affecting communication, and increased consumption curren

Inactive Publication Date: 2006-08-24
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a semiconductor integrated circuit device that can detect and avoid errors in packet data transmission. The device includes a hopping frequency decision unit, a transmission unit, a reception unit, an error detection unit, and a control unit. The error detection unit assumes there are packet errors and the control unit estimates the quality of the frequency channels. The hopping frequency decision unit then performs frequency hopping by calculating packet error rates and estimating channel qualities. The control unit determines if the received frequency channels are usable or not and avoids the ones that are not. This invention helps to improve the reliability and accuracy of data transmission.

Problems solved by technology

However, since the radio appliance has to perform reception operations other than receptions of the user data and the control data, the consumption current is increased.
But, in the case of the Passive method, it is impossible to know the degree of the actual affections of the measured radio waves affected on communications.
However, the Active method has problems such that a plurality of items of data has to be received to measure the error rates and it takes a long time to determine each channel condition.
And the Active method further has a problem that interference waves are varied in strength with the elapse of time.
Since the strengths of the interference waves vary as the time goes on because of those causes, this variations of affections by the interference are also generated as a problem.
Furthermore, on the case of avoidance of use of channels with very poor qualities by means of the AFH, when qualities of most of channels in the ISM band become poor, it is worried that radio waves to be transmitted from the Bluetooth are collected to a part of the ISB band to influence adverse effects on other appliances.

Method used

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  • Radio communication device and semiconductor integrated circuit device used for the same
  • Radio communication device and semiconductor integrated circuit device used for the same
  • Radio communication device and semiconductor integrated circuit device used for the same

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Experimental program
Comparison scheme
Effect test

first embodiment

[0041]FIG. 2 is a block diagram of the radio communication system showing the Bluetooth device regarding the first embodiment of the invention together with the access point of the wireless LAN. The radio communication system shown in FIG. 2 shows two devices of first and second Bluetooth devices 11, 12 as each Bluetooth device; however, the number of the Bluetooth devices is not limited to two. The radio communication system in FIG. 2 includes an access point 13 of the wireless LAN other than the first and second Bluetooth devices 11, 12 and FIG. 2 shows a state in which a mutual radio communication between the first and second Bluetooth devices 11, 12 is interfered by a radio wave from the access point 13.

[0042] The first and second Bluetooth devices in FIG. 2 includes a semiconductor integrated circuit device 20 (hereinafter, referred to as LSI) for Bluetooth integrated into one chip, a radio antenna 31 connected to the LSI 20 and a host 32, as shown in FIG. 3, respectively. A t...

second embodiment

[0096] Next the second embodiment will be described. In the second embodiment, when estimating the channel quality to decide the channel to be used, the Bluetooth device estimates the channel quality of the channel which is assumed that its quality is excellent and used in the reception operation by calculating its packet error rate. When the packet error rate becomes larger than the predetermined value (threshold value), it is assumed that the channel quality is deteriorated and the use of the channel is stopped. On the contrary, the channel of which the quality is seemed to be poor and which is not used in the reception operation is sequentially measured its field strength and when the field strength is lowered, it is assumed that its quality becomes excellent and the use thereof is started again.

[0097] A flowchart in FIG. 11 shows the procedure deciding the use of the channel to be used in the second embodiment. The flowchart of FIG. 11 differs from that of FIG. 8 at the point t...

third embodiment

[0100] Next, the third embodiment will be explained. A flowchart in FIG. 12 shows the reception procedures in the third embodiment. The step S70 in the flowchart in FIG. 6 showing the basic reception operation procedures stores the number of times of the reception operations for each channel and the number of times of errors for each type so as to calculate the packet error rates in the update of error information. On the other hand, in the step S72 of the flowchart in FIG. 12, the packet error index is defined as follows. Then, the Bluetooth device seems the packet error index as the packet error rate to estimate the channel quality. Other operations are the same as those of the flowchart in FIG. 6.

(A) If any error is not found in the packets received in the reception operations, the packet error index is updated as follows.

‘packet error index=packet error index retroactive by one×[1−(1 / B)] (B is predetermined positive number, 1 / B is value of 0 to 1)’

(B) If any error is found i...

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Abstract

A semiconductor integrated circuit for a radio communication terminal sequentially uses a plurality of frequency channels by instructions from a hopping frequency decision unit to receive packet data by a reception unit. When the integrated circuit cannot detect the head of the packet data in reception operations, the integrated circuit cannot receive packet data should be received originally then assumes that the received packet data is a packet error. And the integrated circuit calculates packet error rates for each frequency channel on the basis of the number of times of reception operations performed for each frequency channel and of the number of times of packet errors to estimate channel qualities by using the packet error rates.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-019980, filed Jan. 27, 2005, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention relates to a radio communication device and a semiconductor integrated circuit used for the same. More specifically, the present invention relates to a radio communication device employing a channel quality estimation method, a method for deciding a channel to be used and a method for deciding transmission power in a radio data communication of a frequency hopping system and relates to a semiconductor integrated circuit device used for the same. [0004] 2. Description of the Related Art [0005] In recent years, a new radio communication system to connect electronic appliances with one another by radio has been developed. The IEEE 802.11b / g, Bluetooth ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/713H04W16/02H04W72/54H04B1/715H04L1/00H04L1/20H04W52/04
CPCH04B1/715H04B2001/7154H04L1/20H04L7/0054H04B1/713Y02B60/50H04B1/7136H04W52/04Y02D30/70H04W72/542H04W24/08H04W72/0453
Inventor KIZU, TOSHIKISHIMOJO, YOSHIMITSUSHIGETA, YOSHINORISHOBATAKE, YASURO
Owner KK TOSHIBA
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