US20110255413A1 - Communication Apparatus and ID Packet Recognition Method Thereof - Google Patents

Communication Apparatus and ID Packet Recognition Method Thereof Download PDF

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Publication number
US20110255413A1
US20110255413A1 US12/980,245 US98024510A US2011255413A1 US 20110255413 A1 US20110255413 A1 US 20110255413A1 US 98024510 A US98024510 A US 98024510A US 2011255413 A1 US2011255413 A1 US 2011255413A1
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United States
Prior art keywords
signal
pattern
communication apparatus
power
packet
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Abandoned
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US12/980,245
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English (en)
Inventor
Yuan Chen
Ting-Che TSENG
Wen-Ying Chien
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MediaTek Inc
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MediaTek Inc
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Publication date
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Priority to US12/980,245 priority Critical patent/US20110255413A1/en
Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHEN, YUAN, CHIEN, WEN-YING, TSENG, TING-CHE
Priority to CN2011100629414A priority patent/CN102254197B/zh
Priority to TW100108869A priority patent/TWI422251B/zh
Publication of US20110255413A1 publication Critical patent/US20110255413A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention is related to a communication apparatus, and more particularly to a communication apparatus for recognizing an ID packet comprised in an RF signal.
  • Bluetooth wireless technology is a short-range communications technology, which is able to replace cables which connect portable and/or fixed devices for communications while maintaining high levels of security.
  • the key features of Bluetooth technology are robustness, low power, and low cost.
  • the Bluetooth specification defines a uniform structure for a wide range of devices to connect and communicate with each other.
  • All Bluetooth devices default to a standby mode. In a standby mode, unconnected devices periodically listen for messages. This procedure is called scanning which is divided into two types: page scan and inquiry scan.
  • a page scan is defined as a connection sub-state in which a device listens for its own device access code (DAC) (via a “page”) for a scan window duration (11.25 ms) every 1.28 seconds in order to set up an actual connection between devices.
  • An inquiry scan is very similar to a page scan except that in this sub-state the receiving device scans for the inquiry access code (IAC) (via an “inquiry”).
  • IAC inquiry access code
  • the inquiry scan is used to discover which devices are in a range and addresses and clocks of devices in the range. Therefore, a normal scan procedure is typically performed during the scan window (11.25 ms) for a Bluetooth device.
  • a page sub-state is used by a master Bluetooth device to activate and connect to a slave Bluetooth device which periodically wakes up in the page scan sub-state.
  • the master Bluetooth device tries to capture the slave Bluetooth device by repeatedly transmitting the slave's device access code (DAC) in different hop channels.
  • the master Bluetooth device transmits the device access code (ID packet) corresponding to the targeted slave Bluetooth device for connection, rapidly on a large number of different hop frequencies. Since the ID packet is a very short packet, the hop rate can be increased from 1600 hops/s to 3200 hops/s.
  • FIG. 1 shows a timing diagram illustrating page and inquiry scan transmissions, wherein pairs of page or inquiry scan messages 100 are repeated within the scan window (11.25 ms) in accordance with the Bluetooth specification.
  • a communication apparatus and a Bluetooth ID packet recognition method thereof are desired to reduce power consumption of the communication apparatus when in a standby mode.
  • a communication apparatus for recognizing an ID packet comprised in an RF signal and a method thereof are provided.
  • An embodiment of a communication apparatus is provided.
  • the communication apparatus comprises an RF module and a scan module coupled to the RF module.
  • the RF module receives an RF signal and generates an intermediary signal corresponding to the RF signal.
  • the scan module recognizes a time-domain pattern corresponding to the intermediary signal, and determines whether the RF signal comprises an ID packet according to the recognized time-domain pattern.
  • the communication apparatus comprises an RF module and a scan module.
  • the RF module receives an RF signal.
  • the scan module is coupled to the RF module and has at least two scan modes comprising a fast scan mode and a normal scan mode, wherein when operating in the fast scan mode, the scan module recognizes a time-domain pattern corresponding to the RF signal and determines whether the RF signal comprises an ID packet according to the recognized time-domain pattern.
  • an embodiment of a method for recognizing an ID packet comprised in an RF signal is provided.
  • An RF signal is received and an intermediary signal corresponding to the RF signal is generated.
  • a fast scan procedure is performed by recognizing a time-domain pattern corresponding to the intermediary signal, and determining whether the RF signal comprises an ID packet according to the recognized time-domain pattern.
  • FIG. 1 shows a timing diagram illustrating page and inquiry scan transmissions
  • FIG. 2A shows a communication apparatus for recognizing ID packets according to an embodiment of the invention
  • FIG. 2B shows a communication apparatus for recognizing ID packets according to another embodiment of the invention.
  • FIG. 3 shows an example illustrating a timing diagram of the signals of the communication apparatus in FIG. 2A or FIG. 2B according to an embodiment of the invention
  • FIG. 4 shows an example illustrating a diagram of the power detection signal S power of the communication apparatus in FIG. 2A or FIG. 2B according to an embodiment of the invention
  • FIG. 5 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus in FIG. 2A or FIG. 2B according to an embodiment of the invention
  • FIG. 6 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus in FIG. 2A or FIG. 2B according to an embodiment of the invention
  • FIG. 7 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus in FIG. 2A or FIG. 2B according to an embodiment of the invention.
  • FIG. 8 shows an ID packet recognition method for a communication apparatus according to an embodiment of the invention.
  • FIG. 2A shows a communication apparatus 200 for recognizing an ID packet according to an embodiment of the invention.
  • the communication apparatus 200 comprises an RF module 210 , an analog to digital converter (ADC) 220 , and a scan module 230 .
  • the RF module 210 receives an RF signal via an antenna 260 .
  • the ADC 220 receives a signal from the RF module 210 and converts the received signal into a digital signal S D .
  • the scan module 230 may perform a fast scan procedure on the digital signal S D to recognize a time-domain pattern corresponding to the digital signal S D and to determine whether the RF signal received by the RF module 210 comprises an ID packet according to the recognized time-domain pattern.
  • the scan module 230 compares the recognized time-domain pattern with a predefined ID pattern, and determines that the RF signal comprises the ID packet when the comparison result indicates that the recognized time-domain pattern matches the predefined ID pattern.
  • the time-domain pattern may comprise a power distribution pattern.
  • the scan module 230 comprises a power detection unit 240 and a packet recognition unit 250 .
  • the power detection unit 240 periodically detects the power of the digital signal S D to obtain a power detection signal S power .
  • the packet recognition unit 250 may determine whether the RF signal comprises the ID packet according to a power distribution pattern of the power detection signal S power in time-domain and provides a power decision result S result for subsequent processes.
  • the communication apparatus 200 may detect that a peer Bluetooth device which sent the Bluetooth ID packet is nearby, and then the communication apparatus 200 may determine whether to set up a connection link with the nearby Bluetooth device according to the Bluetooth ID packet.
  • the communication apparatus 200 may further comprise a down converter coupled between the RF module 210 and the scan module 230 (as shown in FIG. 2B ) for down converting the signal from the RF module 210 to generate an intermediary signal, such as an intermediate frequency (IF) signal or a Baseband signal, and then the scan module 230 may perform a fast scan procedure according to the intermediate signal, to recognize whether a Bluetooth ID packet is received.
  • the ADC 220 may be implemented between the power detection unit 240 and the packet recognition unit 250 rather than prior to the power detection unit 240 , as shown in FIG. 2B , so as to reduce conversion distortion caused by the ADC 220 and obtain the power detection signal S power accurately.
  • the power detection can be implemented in either analog or digital domain, and in either RF bands, IF bands or basebands.
  • FIG. 3 shows an example illustrating a timing diagram of the signals of the communication apparatus 200 in FIG. 2A or FIG. 2B according to an embodiment of the invention.
  • signal S 1 represents a Bluetooth ID packet format (in this embodiment, eight slots ST 1 -ST 8 are shown as example), and signal S 2 represents a power waveform of the signal S 1 received by the RF module 210 of FIG. 2A or FIG. 2B .
  • the power detection unit 240 may obtain the power detection signal S power by sampling the digital signal S D and comparing the sample values with a threshold value.
  • the power detection signal S power is at a high logic level “1” when the signal S 2 has exceeded the threshold value, and the power detection signal S power is at a low logic level “0” when the signal S 2 has not exceeded the threshold value.
  • the power detection unit 240 may provide the power detection signal S power comprising N-bit power distribution patterns covering at least 1005.5 ⁇ s to express the power distribution of the digital signal S D .
  • N-bit hard decision is described here as an example, it should be noted that soft power information can also be employed to detect the two power peaks.
  • FIG. 4 shows an example illustrating a diagram of the power detection signal S power of the communication apparatus 200 in FIG. 2A or FIG. 2B according to an embodiment of the invention.
  • each time period T 1 includes N sub-periods (e.g. 18 sub-periods, each substantially equal to 72 ⁇ s) and each of the N bits indicates the power level during a corresponding sub-period within T 1 .
  • the time-length of the time period T 1 must be large enough to cover 1005.5 ⁇ s, so as to contain at least two power peaks of the digital signal S D , as described above.
  • the power distribution pattern is composed of 18 bits. Two different power distribution patterns P 1 and P 2 are shown in FIG. 4 .
  • the packet recognition unit 250 After receiving the power detection signal S power , the packet recognition unit 250 determines whether the power distribution pattern P 1 or P 2 matches a predefined Bluetooth ID pattern. If the power distribution pattern matches a predefined Bluetooth ID pattern, the packet recognition unit 250 determines that a Bluetooth ID packet is detected.
  • ID packets can be expressed as two bits with high logic level “1” separated by a time interval close to 312.5 ⁇ s or 937.5 ⁇ s.
  • label 41 constituted by two bits with a high logic level “1” separated by 2 bits with a low logic level “0” is close to 312.5 ⁇ s.
  • the power distribution patterns P 1 and P 2 match one type of Bluetooth ID pattern, respectively.
  • FIG. 5 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus 200 in FIG. 2A or 2 B according to an embodiment of the invention.
  • the power distribution pattern is obtained by detecting the power of the digital signal S D every 72 ⁇ s for 18 times.
  • two different power distribution patterns P 3 and P 4 are shown in FIG. 5 .
  • the packet recognition unit 250 of FIG. 2A or 2 B may provide the power decision result S result to indicate that whether the power distribution pattern P 3 or P 4 matches a Bluetooth ID pattern.
  • the packet recognition unit 250 may determine that the power distribution pattern P 3 does not match any Bluetooth ID pattern and is a noise/interference pattern.
  • the packet recognition unit 250 still determines that the power distribution pattern P 4 does not match a Bluetooth ID packet because there are four continuous separation groups each composed of a bit with a high logic level “1” and one or more bits with a low logic level “0” subsequent to the bit with a high logic level “1”, as shown in labels 54 , 55 , 56 and 57 of FIG. 5 . Due to the number of continuous separation groups of the power distribution pattern P 4 being larger than or equal to a specific value (e.g. ⁇ 4), the packet recognition unit 250 may determine that the power distribution pattern P 4 matches a noise/interference pattern rather than a Bluetooth ID pattern and provide the power decision result S result to notify subsequent circuits, wherein the specific value is determined according to implementation choice.
  • a specific value e.g. ⁇ 4
  • FIG. 6 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus 200 in FIG. 2A or 2 B according to an embodiment of the invention.
  • each power distribution patterns P 5 -P 8 is obtained by detecting the power of the digital signal S D every 72 ⁇ s for 18 times.
  • each of the power distribution patterns P 5 , P 6 , P 7 and P 8 has no bit with a high logic level “1”, which means that the power of the digital signal S D has not exceeded the threshold value during four continuous fast scan procedures.
  • the scan module 230 may switch from the fast scan mode to the normal scan mode, and the normal scan procedure may be performed during a scan window (11.25 ms) to further confirm whether the RF signal received by the antenna 260 comprises any Bluetooth packets or noise.
  • FIG. 7 shows another example illustrating a diagram of the power detection signal S power of the communication apparatus 200 in FIG. 2A or 2 B according to an embodiment of the invention.
  • the power distribution pattern P 9 is obtained by detecting the power of the digital signal S D every 72 ⁇ s for 18 times.
  • the number of continuous bits with a high logic level “1” of the power distribution pattern P 9 is larger than or equal to a specific value (e.g. 16).
  • the packet recognition unit 250 may determine that the power distribution pattern P 9 does not match a Bluetooth ID pattern and provide the power decision result S result to notify subsequent circuits.
  • the scan module 230 may switch from the fast scan mode to the normal scan mode to further confirm whether the RF signal received by the antenna 260 comprises any Bluetooth packets or noise such as interference caused by a Wi-Fi packet.
  • FIG. 8 shows an ID packet recognition method for a communication apparatus according to an embodiment of the invention.
  • an RF signal is received via an antenna (e.g. 260 ) and an RF module (e.g. 210 ) of the communication apparatus (step S 802 ).
  • the RF signal is converted into an intermediary signal, e.g. a digital signal, an intermediate frequency signal or a Baseband signal.
  • a fast scan procedure is performed by a scan module (e.g. 230 ) of the communication apparatus on the intermediary signal to obtain a power distribution pattern corresponding to the intermediary signal in a time domain, and to obtain a power decision result corresponding to the RF signal according to the power distribution pattern.
  • step S 808 a subsequent process is performed according to the power decision result obtained in step S 806 .
  • the communication apparatus may establish a link with the peer Bluetooth device based on the ID packet.
  • the power decision result indicates that the power distribution pattern matches a noise/interference ID pattern (e.g. P 3 or P 4 of FIG. 5 )
  • the communication apparatus may determine that the RF signal has noise interference or the RF signal does not comprise any Bluetooth ID packets.
  • the communication apparatus may continue performing the fast scan procedure periodically to monitor the power distribution pattern corresponding to the intermediary signal in a time domain.
  • the communication apparatus may stop performing the fast scan procedure and then start to perform a normal scan procedure to further confirm whether the RF signal comprises any Bluetooth ID packets. If the power decision result indicates that high power level has been detected in the power distribution pattern (e.g. P 9 of FIG. 7 ), the communication apparatus may stop performing the fast scan procedure and then start to perform a normal scan procedure to further confirm whether the RF signal comprises a plurality of Bluetooth ID packets or has noise interference caused by a Wi-Fi packet. Therefore, by performing the fast scan procedure of the invention, a communication apparatus can determine whether an ID packet exists faster; thus reducing power consumption. Furthermore, high detection rate and low false alarm rate are obtained for page and inquiry scans in a Bluetooth compatible network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
US12/980,245 2010-04-15 2010-12-28 Communication Apparatus and ID Packet Recognition Method Thereof Abandoned US20110255413A1 (en)

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Application Number Priority Date Filing Date Title
US12/980,245 US20110255413A1 (en) 2010-04-15 2010-12-28 Communication Apparatus and ID Packet Recognition Method Thereof
CN2011100629414A CN102254197B (zh) 2010-04-15 2011-03-16 通信装置及识别包含于rf信号中id封包的方法
TW100108869A TWI422251B (zh) 2010-04-15 2011-03-16 通訊裝置及識別包含於ｒｆ信號中ｉｄ封包之方法

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US32434010P 2010-04-15 2010-04-15
US12/980,245 US20110255413A1 (en) 2010-04-15 2010-12-28 Communication Apparatus and ID Packet Recognition Method Thereof

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US13/007,789 Active 2033-12-27 US9001749B2 (en) 2010-04-15 2011-01-17 Communication apparatus and bluetooth ID packet recognition method thereof
US14/656,579 Active US9426742B2 (en) 2010-04-15 2015-03-12 Communication apparatus and bluetooth ID packet recognition method thereof

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US20110255413A1 (en) * 2010-04-15 2011-10-20 Mediatek Inc. Communication Apparatus and ID Packet Recognition Method Thereof
CN103701508B (zh) * 2013-12-31 2016-08-31 深圳市汇顶科技股份有限公司 一种电子设备的近场通信方法和系统
US10085216B1 (en) * 2017-11-09 2018-09-25 Shenzhen GOODIX Technology Co., Ltd. Balanced wireless data transmission
CN109714816B (zh) * 2018-12-21 2021-08-10 武汉万集信息技术有限公司 一种机动车电子标识读写设备的功率调整方法、装置及系统
CN110062412B (zh) * 2019-04-09 2022-01-04 惠州Tcl移动通信有限公司 无线配对方法、系统、存储介质及移动终端
CN112825572A (zh) 2019-11-20 2021-05-21 联发科技（新加坡）私人有限公司 蓝牙查询/寻呼的方法及通信设备

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US11496983B2 (en) * 2015-05-29 2022-11-08 Apple Inc. Techniques for selecting conducted RF links for mitigating multi-radio coexistence

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US9426742B2 (en) 2016-08-23
CN106028269A (zh) 2016-10-12
CN102254197A (zh) 2011-11-23
US9001749B2 (en) 2015-04-07
CN102254197B (zh) 2013-11-06
TW201141152A (en) 2011-11-16
TWI559710B (zh) 2016-11-21
US20150195783A1 (en) 2015-07-09
US20110255414A1 (en) 2011-10-20
TW201206121A (en) 2012-02-01
TWI422251B (zh) 2014-01-01

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