WO2012171297A1 - 一种唤醒信号匹配方法、装置及标签 - Google Patents
一种唤醒信号匹配方法、装置及标签 Download PDFInfo
- Publication number
- WO2012171297A1 WO2012171297A1 PCT/CN2011/082159 CN2011082159W WO2012171297A1 WO 2012171297 A1 WO2012171297 A1 WO 2012171297A1 CN 2011082159 W CN2011082159 W CN 2011082159W WO 2012171297 A1 WO2012171297 A1 WO 2012171297A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wake
- signal
- square wave
- matching
- determining
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
- G06K19/0702—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery
- G06K19/0705—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including a battery the battery being connected to a power saving arrangement
Definitions
- the present invention relates to the field of radio frequency identification technologies, and in particular, to a wake-up signal matching method, apparatus, and tag. Background technique
- Radio Frequency Identification is a non-contact automatic identification technology that automatically recognizes target objects and acquires relevant data through radio frequency signals.
- the identification work can work in various harsh environments without manual intervention.
- RFID technology recognizes high-speed moving objects and recognizes multiple labels at the same time, making operation quick and easy.
- Radio frequency identification systems mainly include tags and readers.
- RFID includes passive radio frequency identification and active radio frequency identification, the essential difference between the two is at the tag end.
- the tags are specifically divided into active electronic tags, semi-active electronic tags, and passive electronic tags.
- the active electronic tag also known as the active tag, is powered entirely by the internal battery, and the energy supply of the tag battery is also partially converted into the RF energy required for the tag to communicate with the reader.
- the battery power supply in the semi-passive electronic tag only supports the circuit that requires power supply to maintain the data or the auxiliary voltage required for the operation of the tag chip, and the tag circuit that consumes little power itself.
- the tag is always in a dormant state before it enters the working state, which is equivalent to a passive tag.
- the internal battery energy consumption of the tag is less than 4, so the battery can last for several years, even up to 10 years; when the tag enters the reading area of the reader When excited by the RF signal from the reader, when entering the working state, the energy exchanged between the tag and the reader supports the RF energy supplied by the reader (reflective modulation mode), and the internal battery function of the tag mainly remedies the tag.
- the RF field strength at the location is insufficient, and the energy of the battery inside the tag is not converted to RF energy.
- Passive electronic tags also known as passive tags, do not have a built-in battery. When the reader is outside the reading range of the reader, the electronic tag is in a passive state. When the reader is within the read range of the reader, the electronic tag emits RF from the reader. The energy is extracted from the power required for its work. Passive electronic tags are generally used in reverse The modulation mode completes the transmission of the electronic tag information to the reader.
- the active electronic tag itself is powered by a battery, has a long read/write distance, a large volume, and a high cost.
- the disadvantage is that the battery cannot be used for a long time, and the battery needs to be replaced after the energy is exhausted.
- Active tags are normally in a low-power standby state.
- the internal battery energy of the tag is very low. Only a very short period of time is required to consume a limited amount of power. Therefore, the battery life can be very long.
- the existing active tags can be classified into the following two types according to the wake-up mode: one is to match the wake-up signal through a hardware circuit or a chip; one is implemented by software.
- the wake-up signals are matched by hardware circuits or chips, but the cost is high, and it is not easy to promote; and the wake-up signals are not basically matched by software.
- other electromagnetic interferences cause the active tags to be awakened by mistakes, such as other electromagnetic interferences, mainly mobile phone signals in space, etc., and it is easy to wake up by mistake, even to wake up as long as there is a signal, then, active The tag is considered to require work, but is actually an invalid interference signal, which causes the tag to consume power and also greatly affects the battery life.
- the technical problem to be solved by the present invention is to provide a wake-up signal matching method, device and tag, which can solve the defect that the active tag is erroneously awakened, and reduce the power consumption of the active tag.
- the present invention provides a wake-up signal matching method, which is applied to a radio frequency identification system, and the method includes:
- the reader sends a wake-up signal to the tag, and the wake-up signal is composed of a plurality of square waves of a fixed frequency; the tag determines whether a wake-up signal is received by matching a square wave, and if it is determined that the wake-up signal is received, the sleep state is Switch to working status.
- the step of determining, by the method of matching a square wave, whether the wake-up signal is received includes:
- the tag determines whether the number of consecutively matched square waves reaches a predetermined number of matched square waves, and if so, determines that a wake-up signal is received.
- the step of determining, by the tag, whether the number of consecutively matched square waves reaches a predetermined number of the matched square waves comprises: Determining whether the number of consecutive square wave hopping interrupts reaches a predetermined number of hops, and if so, determining that the number of consecutively matched square waves reaches a predetermined number of matched square waves;
- the number of the hops is the number of the matched square waves plus two.
- the method further includes:
- the start timer is interrupted on the rising or falling edge of the second square wave, and the timing of the timer is determined when the rising edge or the falling edge of the Nth square wave is interrupted, and whether the timing is determined according to the timing Satisfying the frequency range of the square wave, if yes, determining that the Nth square wave is matched; if not, determining that the Nth square wave is not matched; wherein N is greater than or equal to 3.
- the label includes a wake-up signal matching unit
- the wake-up signal matching unit is configured to: determine whether a wake-up signal is received by matching a square wave, and switch from a sleep state to an active state if it is determined that the wake-up signal is received.
- the wake-up signal matching unit is configured to determine whether a wake-up signal is received by matching a square wave in the following manner:
- the wake-up signal matching unit is further configured to: start a timer on a rising or falling edge of the second square wave, and determine the timer when the rising edge or falling edge of the Nth square wave is interrupted. The timing time, and determining whether the frequency range of the square wave is satisfied according to the timing time, if yes, determining that the Nth square wave is matched; if not, determining that the Nth square wave is not matched; , N is greater than or equal to 3.
- the present invention also provides a wake-up signal matching apparatus for use in a radio frequency identification system, the apparatus comprising a reader and a tag, the reader comprising a wake-up signal transmitting unit, the tag comprising a wake-up signal matching unit, wherein:
- the wake-up signal sending unit is configured to: send a wake-up signal to the tag, where the wake-up signal is composed of multiple square waves of a fixed frequency;
- the wake-up signal matching unit is configured to: determine whether a wake-up signal is received by matching a square wave, and switch from a sleep state to an active state if it is determined that the wake-up signal is received.
- the wake-up signal sending unit is configured to send to the label by using an air interface command.
- the wake-up signal matching unit is configured to determine whether the wake-up signal is received according to the following matching square wave: determining whether the number of consecutively matched square waves reaches a predetermined number of matching square waves, and if so, determining that the wake-up is received signal.
- the wake-up signal matching unit is further configured to: start a timer on a rising or falling edge of the second square wave, and determine the timer when the rising edge or falling edge of the Nth square wave is interrupted. The timing time, and determining whether the frequency range of the square wave is satisfied according to the timing time, if yes, determining that the Nth square wave is matched; if not, determining that the Nth square wave is not matched; , N is greater than or equal to 3.
- radio frequency identification system solves the method of false wake-up of the active tag, reduces the cost of the active tag, solves the defect that the active tag is erroneously awakened, reduces the power consumption of the active tag, and reduces the volume of the active tag, which can satisfy A variety of application scenarios.
- FIG. 1 is a schematic diagram of a matching wake-up signal according to an embodiment of the present invention.
- FIG. 2 is a flow chart of a method for matching a wake-up signal according to an embodiment of the present invention. Preferred embodiment of the invention
- the embodiment of the present invention provides a wake-up signal matching method, including: when the reader and the tag communicate, send an air interface command to the tag, and the tag responds to the command of the reader to implement the reader. Communication with the tag; the command sent by the reader is with a wake-up signal, that is, the notification tag is switched from the sleep state to the working state.
- the wake-up signal is generally composed of several square waves of a fixed frequency.
- the present invention specifically draws four consecutive methods of matching square waves. Since it is a square wave, there is no difference in phase. As long as 6 jumps are interrupted continuously, it can be considered that 4 parties have been completed. Wave matching.
- the number of matching square waves ⁇ can be appropriately increased or decreased according to the actual effect.
- the matching algorithm of the present invention is mainly divided into the following steps:
- the first falling edge interrupts do some basic settings, including timer configuration, active electronic tag status settings, and so on.
- the second falling edge interrupts the timer to start counting.
- the timing can be implemented by a hardware timer inside the processor.
- the configuration register of the software setting timer can start the timer to start counting, and determine the timing time by reading the count value of the timer when needed, that is, The length of time passed.
- the third falling edge interrupt determines whether a square wave period is satisfied (that is, whether it is matched with the frequency of the wake-up signal), if it is satisfied, the subsequent matching is continued, and if not, the second step is restarted. Match, until timeout, exit.
- the fourth falling edge determines whether two square wave periods are satisfied. If it is satisfied, the subsequent matching is continued, and if not, the user exits and sleeps.
- the fifth falling edge determines whether three square wave periods are satisfied. If yes, the subsequent matching is continued, and if not, the user exits and sleeps.
- the sixth falling edge determines whether four square wave periods are satisfied. If the matching is successful, the physical layer is received, and if not, the sleep is exited.
- the interrupt can internally set the corresponding flag to determine the processing flow of the loop, that is: the interrupt internally sets the flag bit if the matching wake-up signal succeeds.
- the flag is internally judged by the interrupt outer loop. If the judgment flag is set, the matching process is exited and the subsequent data receiving process is performed.
- the falling edge of the square wave will generate a wake-up interrupt.
- the timer is set in one interrupt.
- the count clock frequency set by the timer cannot be too fast, and should match the frequency of the wake-up signal. Generally, it can be set to 0.5-1.5MHz; the second interrupt starts the timer to start counting, the third interrupt reads the count value in the timer, and the time is counted according to the counted count, and then it is judged whether a square wave is satisfied.
- Frequency range (Because the counting clock is fixed, it is possible to calculate the elapsed time according to the counting value, that is, the period, the reciprocal of the period is the frequency, and determine whether the calculated frequency satisfies the frequency range of one square wave, and further It is judged whether it is roughly consistent with the frequency of the wake-up signal. If it is satisfied, the matching continues, otherwise it is re-matched. After the above process is repeated, after the four square waves are successfully matched, the wake-up signal is successfully matched, and the radio receiving is turned on for data reception. If there is no matching within a certain period of time, the timeout is exited and the sleep continues.
- state 3 it is judged whether the two wake-up square wave frequency requirements are met. If it is satisfied, the counting is restarted, and the state is set to 4, otherwise the state is reset to 0 and sleep.
- state 4 it is judged whether the three wake-up square wave frequency requirements are met. If it is satisfied, the counting is restarted, and the state is set to 5, otherwise the state is reset to 0 and sleep.
- state 5 it is judged whether the four wake-up square wave frequency requirements are met. If it is satisfied, the wake-up signal flag is successfully matched, otherwise the state is reset to 0 and sleep.
- the method of the present invention increases the matching process of the wake-up signal, which not only completes the matching of the wake-up signal, but also plays a good synchronous role for subsequent data reception.
- the version coverage area in which the wake-up signal matching is increased is reduced. This is because the energy of the spatial signal will be lost during the propagation process, the signal energy at the edge of the coverage area is the weakest, and the signal received by the tag is also less effective. If the wake-up signal is matched, it is equivalent to the signal effect, so the coverage area of the matching wake-up signal will be reduced under the same conditions. But This change is not very large and can fully meet the requirements of practical applications.
- the embodiment of the present invention further provides a label, where the label includes a wake-up signal matching unit.
- the wake-up signal matching unit is configured to determine whether the wake-up signal is received by matching a square wave, and to switch from the sleep state to the active state if it is determined that the wake-up signal is received.
- the wake-up signal matching unit determines whether the wake-up signal is received by matching a square wave, including:
- the wake-up signal matching unit is further configured to: when the rising or falling edge of the second square wave is interrupted, the timer is started, and the timer is determined when the rising edge or the falling edge of the Nth square wave is interrupted. a timing time, and determining, according to the timing time, whether the frequency range of the square wave is satisfied, and if so, determining that the Nth square wave is matched; otherwise, determining that the Nth square wave is not matched; wherein, N is greater than Equal to 3.
- the embodiment of the present invention further provides a wake-up signal matching device, which is applied to a radio frequency identification system, the device includes a reader and a tag, the reader further includes a wake-up signal sending unit, and the tag further includes a wake-up signal matching unit, where:
- the wake-up signal sending unit is configured to send a wake-up signal to the tag, where the wake-up signal is composed of a plurality of square waves of a fixed frequency;
- the wake-up signal matching unit is configured to determine whether the wake-up signal is received by matching a square wave, and to switch from the sleep state to the active state if it is determined that the wake-up signal is received.
- the wake-up signal sending unit is configured to send the wake-up signal to the label by using an air interface command
- the wake-up signal matching unit is configured to determine whether the wake-up signal is received according to the following method of matching a square wave: determining whether the number of consecutively matched square waves reaches a predetermined number of matching square waves, and if so, determining that the wake-up is received signal.
- the wake-up signal matching unit is further configured to be on a rising or falling edge of the second square wave
- the timer is started along the interrupt start timer, and the timing of the timer is determined when the rising edge or the falling edge of the Nth square wave is interrupted, and the frequency range of the square wave is determined according to the timing time. If yes, the determination is performed. Matching to the Nth square wave; if not, determining that the Nth square wave is not matched; wherein N is greater than or equal to 3.
- the present invention can be applied to different application scenarios.
- the following uses the national standard electronic non-stop charging application as an example to introduce the application of the present invention in these scenarios.
- the wake-up signal is 15-17 14KHz square waves. After the active tag wakes up, only the wake-up link and the CPU are working. Since the 14K rate is very low, the CPU clock frequency can be reduced as much as possible to save power when just waking up.
- the matching range is set to 11K-16.7K, and the matching number is 4 14K square waves.
- the matching number is 4 14K square waves.
- the tag will normally receive 7 square waves, and The received waveforms of other antennas are about 5 or so.
- modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
- the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
- the invention is not limited to any particular combination of hardware and software.
- radio frequency identification system solves the problem of false wake-up of active tags, reduces the cost of active tags, solves the defect that the active tags are falsely awakened, reduces the power consumption of the active tags, and reduces the active tag volume. , can meet a variety of application scenarios.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
本发明公开了一种唤醒信号匹配方法、装置及标签,应用于射频识别***,所述方法包括:阅读器向标签发送唤醒信号,所述唤醒信号由固定频率的多个方波组成;所述标签通过匹配方波的方式判断是否接收到唤醒信号,若判断出接收到唤醒信号,则从休眠状态切换到工作状态。本发明提出一种射频识别***中解决有源标签误唤醒的方法,降低有源标签成本,解决有源标签被误唤醒的缺陷,降低有源标签的功耗;此外,减小了有源标签体积,能满足多种应用场景。
Description
一种唤醒信号匹配方法、 装置及标签
技术领域
本发明涉及射频识别技术领域, 尤其涉及一种唤醒信号匹配方法、 装置 及标签。 背景技术
射频识别( Radio Frequency Identify, 简称为 RFID )是一种非接触式的自 动识别技术, 其通过射频信号自动识别目标对象并获取相关数据, 识别工作 无须人工干预, 可工作于各种恶劣环境。 RFID技术可识别高速运动物体并可 同时识别多个标签, 操作快捷方便。
射频识别***主要包括标签和读写器。 RFID包括无源射频识别和有源射 频识别, 两者的本质区别在标签端。 标签具体分为有源电子标签、 半有源电 子标签和无源电子标签。
有源电子标签又称主动式标签, 标签的工作电源完全由内部电池供电, 同时标签电池的能量供应也部分地转换成电子标签与阅读器通讯所需的射频 能量。
半无源电子标签内的电池供电仅对标签内要求供电维持数据的电路或者 标签芯片工作所需电压的辅助支持, 本身耗电很少的标签电路供电。 标签未 进入工作状态前, 一直处于休眠状态, 相当于无源标签, 标签内部电池能量 消耗 4艮少, 因此电池可维持几年, 甚至长达 10年有效; 当标签进入阅读器的 读出区域时, 受到阅读器发出的射频信号激励, 进入工作状态时, 标签和阅 读器之间信息交换的能量支持以阅读器供应的射频能量为主 (反射调制方 式) , 标签内部电池作用主要在于弥补标签所处位置的射频场强不足, 标签 内部电池的能量不转换为射频能量。
无源电子标签又称被动式标签, 没有内装电池, 在阅读器的读出范围之 外时, 电子标签处于无源状态, 在阅读器的读出范围之内时, 电子标签从阅 读器发出的射频能量中提取其工作所需的电源。 无源电子标签一般均釆用反
射调制方式完成电子标签信息向阅读器的传送。
有源电子标签自身带有电池供电, 读写距离较远, 体积较大, 成本更高, 不足之处是电池不能长久使用, 能量耗尽后需要更换电池。
有源标签正常处于一种低功耗的待机状态,标签内部电池能量消耗很少, 只有在需要工作的非常短的时间内才消耗有限的电能, 因此, 电池寿命可以 非常长。 现有的有源标签根据唤醒方式可分为如下两种: 一种是通过硬件电 路或芯片对唤醒信号进行匹配; 一种是通过软件实现。
但是, 上述两种有源标签均存在一些不足之处: 通过硬件电路或芯片对 唤醒信号进行匹配的, 但其成本较高, 不易于推广; 而通过软件实现的基本 都不进行唤醒信号的匹配, 实际应用中发现经常有其它电磁干扰导致有源标 签被误唤醒, 如其它电磁干扰, 主要是空间的手机信号等, 且很容易误唤醒, 甚至达到只要有信号就唤醒, 这时, 有源标签认为需要工作, 而实际只是无 效的干扰信号, 因而造成标签的耗电, 并且也大大影响了电池的使用寿命。 发明内容
本发明解决的技术问题是提供一种唤醒信号匹配方法、 装置及标签, 能 够解决有源标签被误唤醒的缺陷, 降低有源标签的功耗。
为解决上述技术问题, 本发明提供了一种唤醒信号匹配方法, 应用于射 频识别***, 所述方法包括:
阅读器向标签发送唤醒信号,所述唤醒信号由固定频率的多个方波组成; 所述标签通过匹配方波的方式判断是否接收到唤醒信号, 若判断出接收 到唤醒信号, 则从休眠状态切换到工作状态。
可选的, 所述标签通过匹配方波的方式判断是否接收到唤醒信号的步骤 包括:
所述标签判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如 果达到, 则判定接收到唤醒信号。
可选的, 所述标签判断连续匹配到方波的个数是否达到预定的所述匹配 方波个数的步骤包括:
统计连续方波跳变中断的个数是否达到预定的跳变个数, 如果达到, 则 判定连续匹配到方波的个数达到预定的所述匹配方波个数;
其中, 所述跳变个数为所述匹配方波个数加 2。
可选的, 所述方法还包括:
在第二个方波上升沿或下降沿中断启动定时器进行计时, 在第 N个方波 上升沿或下降沿中断时确定所述定时器的计时时间, 并才艮据所述计时时间判 断是否满足方波的频率范围, 若满足, 则判定匹配到该第 N个方波; 若不满 足, 则判定未匹配到该第 N个方波; 其中, N大于等于 3。
可选的, 所述标签包括唤醒信号匹配单元,
所述唤醒信号匹配单元设置为: 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
可选的, 所述唤醒信号匹配单元是设置为以如下方式通过匹配方波的方 式判断是否接收到唤醒信号:
判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如果达到, 则判定接收到唤醒信号。
可选的, 所述唤醒信号匹配单元还设置为: 在第二个方波上升沿或下降 沿中断启动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述 定时器的计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若 满足, 则判定匹配到该第 N个方波; 若不满足, 则判定未匹配到该第 N个方 波; 其中, N大于等于 3。
本发明还提供一种唤醒信号匹配装置, 应用于射频识别***, 所述装置 包括阅读器和标签, 所述阅读器包括唤醒信号发送单元, 所述标签包括唤醒 信号匹配单元, 其中:
所述唤醒信号发送单元设置为: 向标签发送唤醒信号, 所述唤醒信号由 固定频率的多个方波组成;
所述唤醒信号匹配单元设置为: 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
可选的, 所述唤醒信号发送单元是设置为通过空口命令向所述标签发送
所述唤醒信号;
所述唤醒信号匹配单元是设置为按照以下匹配方波的方式判断是否接收 到唤醒信号: 判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如 果达到, 则判定接收到唤醒信号。
可选的, 所述唤醒信号匹配单元还设置为: 在第二个方波上升沿或下降 沿中断启动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述 定时器的计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若 满足, 则判定匹配到该第 N个方波; 若不满足, 则判定未匹配到该第 N个方 波; 其中, N大于等于 3。
上述射频识别***中解决有源标签误唤醒的方法, 降低有源标签成本, 解决有源标签被误唤醒的缺陷, 降低有源标签的功耗; 此外, 减小了有源标 签体积, 能满足多种应用场景。 附图概述
此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的 不当限定。 在附图中:
图 1为本发明实施例的匹配唤醒信号的示意图;
图 2为本发明实施例的匹配唤醒信号的方法流程图。 本发明的较佳实施方式
为解决射频识别***中有源标签误唤醒的问题, 本发明实施方式提出一 种唤醒信号匹配方法, 包括: 阅读器和标签通讯时向标签发送空口命令, 标 签响应阅读器的命令, 实现阅读器和标签之间通信; 阅读器发送的命令中是 带有唤醒信号的, 即通知标签从休眠状态切换到工作状态。
其中, 唤醒信号一般是由固定频率的若干个方波组成。 为了较好的判断 是否为唤醒信号, 本发明具体釆取连续 4个匹配方波的方法。 由于是方波, 因此没有相位的差别, 只要连续抓到 6次跳变中断即可认为已经完成 4个方
波匹配。
ϋ 变个数 Ν与匹配方波个数 η满足 Ν = η + 2的关系。
其中匹配方波的个数 η可根据实际的效果适当增加或者减少。
本发明的匹配算法, 主要分为以下几步:
第一步, 第一个下降沿中断做些基本设置, 包括定时器配置、 有源电子 标签状态设置等。
第二步, 第二个下降沿中断打开定时器开始计时。
所述的计时, 可通过处理器内部的硬件定时器来实现, 例如软件设置定 时器的配置寄存器可以启动定时器开始计数, 在需要时通过读取定时器的计 数值确定计时时间, 即得到已经经过的时长。
第三步, 第三个下降沿中断判断是否满足一个方波周期 (也即判断是否 与唤醒信号的频率相匹配) , 若满足则继续进行后续匹配, 若不满足则回到 第二步重新开始匹配, 直到超时为止, 退出。
第四步, 第四个下降沿判断是否满足两个方波周期, 若满足则继续进行 后续匹配, 若不满足则退出, 休眠。
第五步, 第五个下降沿判断是否满足三个方波周期, 若满足则继续进行 后续匹配, 若不满足则退出, 休眠。
第六步, 第六个下降沿判断是否满足四个方波周期, 若满足则匹配成功, 进行物理层接收, 若不满足则退出休眠。
其中, 上述的休眠或超时退出都是在中断外的循环内判断, 中断内部可 以设置相应标志位决定循环的处理流程, 即: 中断内部如果匹配唤醒信号成 功, 则将标志位置位。 中断外循环内部判断该标志位, 如果判断标志位被置 位了, 就退出匹配过程, 进行后续数据接收过程。
下文中将结合附图对本发明的实施例进行详细说明。 需要说明的是, 在 不冲突的情况下, 本申请中的实施例及实施例中的特征可以相互任意组合。
参照图 1所示, 方波的下降沿会产生唤醒中断, 一次中断中进行定时器 的设置, 定时器设置的计数时钟频率不能太快,要和唤醒信号的频率相匹配,
一般可设为 0.5-1.5MHz; 二次中断则启动定时器开始计时, 三次中断时读取 定时器中计数值, 并根据该读取的计数值得出计时时间, 进而判断是否满足 一个方波的频率范围, (由于计数时钟固定, 因此, 根据该计数值即可计算 出经过多长时间, 即周期, 周期的倒数即为频率, 判断该计算出的频率是否 满足一个方波的频率范围, 进而判断出是否与唤醒信号的频率大致相符) 满 足则继续匹配, 否则重新匹配。 后续反复上述过程, 当连续匹配成功 4个方 波后认为唤醒信号匹配成功, 打开射频接收进行数据接收, 如在一定时间内 没有匹配成功, 则超时退出, 继续休眠。
参照图 2所示, 本发明实施例的唤醒信号的匹配流程描述如下:
1 )唤醒中断后, 判断是否是状态 0, 首次中断默认是状态 0, 在状态 0 下进行匹配前的设置, 同时将标签状态设置为 1。
2 )状态 1下开始定时器计数, 同时将标签状态置为 2, 在状态 1中会判 断整个匹配是否超时, 超时则休眠, 否则继续接收。
3 )状态 2中判断是否满足一个唤醒方波频率要求,满足则重新开始计数, 将状态置为 3 , 否则将状态重新置为 1 , 继续接收。
4 )状态 3中判断是否满足两个唤醒方波频率要求,满足则重新开始计数, 将状态置为 4, 否则将状态重新复位为 0, 休眠。
5 )状态 4中判断是否满足三个唤醒方波频率要求,满足则重新开始计数, 将状态置为 5 , 否则将状态重新复位为 0, 休眠。
6 )状态 5中判断是否满足四个唤醒方波频率要求, 若满足则置成功匹配 唤醒信号标志, 否则将状态重新复位为 0, 休眠。
若出现上述状态之外的其它状态, 则认为是非法状态, 软件做复位处理。 结合以上描述, 本发明方法增加唤醒信号的匹配流程, 该流程不仅完成 了唤醒信号的匹配, 对后续数据接收也起到了很好的同步作用。
另外, 需要说明的是, 釆用增加了唤醒信号匹配的版本覆盖区域缩小了。 这是由于空间信号的能量在传播过程中会产生损耗, 处于覆盖区域边缘的信 号能量最弱, 标签接收到的信号效果也较差。 如果匹配唤醒信号, 相当于对 信号效果要求较高, 所以相同条件下匹配唤醒信号的覆盖区域会缩小。 但是
该变化不是很大, 完全可以满足实际应用的要求。
此外, 本发明实施例中还提供了一种标签, 该标签包括一唤醒信号匹配 单元,
所述唤醒信号匹配单元设置为, 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
较佳的, 所述唤醒信号匹配单元通过匹配方波的方式判断是否接收到唤 醒信号, 包括:
判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如果达到, 则判定接收到唤醒信号。
较佳的, 所述唤醒信号匹配单元还设置为, 在第二个方波上升沿或下降 沿中断启动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述 定时器的计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若 满足, 则判定匹配到该第 N个方波; 否则, 判定未匹配到该第 N个方波; 其 中, N大于等于 3。
此外, 本发明实施例中还提供了一种唤醒信号匹配装置, 应用于射频识 别***, 该装置包括阅读器和标签, 阅读器进一步包括唤醒信号发送单元, 标签进一步包括唤醒信号匹配单元, 其中:
所述唤醒信号发送单元设置为, 向标签发送唤醒信号, 所述唤醒信号由 固定频率的多个方波组成;
所述唤醒信号匹配单元设置为, 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
较佳的, 所述唤醒信号发送单元用于, 通过空口命令向所述标签发送所 述唤醒信号;
所述唤醒信号匹配单元设置为, 按照以下匹配方波的方式判断是否接收 到唤醒信号: 判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如 果达到, 则判定接收到唤醒信号。
较佳的, 所述唤醒信号匹配单元还设置为, 在第二个方波上升沿或下降
沿中断启动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述 定时器的计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若 满足, 则判定匹配到该第 N个方波; 若不满足, 则判定未匹配到该第 N个方 波; 其中, N大于等于 3。
本发明可用于不同的应用场景, 下面以国标电子不停车收费应用为例介 绍本发明在这些场景中的应用。
国标 ETC应用中其唤醒信号为 15-17个 14KHz方波。有源标签唤醒后只 有唤醒链路和 CPU在工作, 由于 14K的速率非常低,可以在刚刚唤醒时尽可 能的降低 CPU主频以节约电量。
首先设置匹配范围为 11K-16.7K, 匹配个数为 4个 14K方波, 关于匹配 方波个数, 通过抓取标签端的接收波形看标签正常情况下会接收到 7个左右 的方波, 而其他天线下接收波形约为 5个左右, 通过实际跑车测试发现匹配 3个方波仍然有一定比例的误唤醒, 最终决定匹配 4个方波来实现软件滤波。
在现场进行了跑车测试, 车内 3个标签, 在车速 40Km-100Km都进行了 测试, 成功率 100%。 看来增加了 14K匹配的软件版本对交易成功率没有什 么影响。
最后对该方案的节电效果进行分析:
电池电量一般为 1500mA/h, 可用比例约 0.7 , 即 1500 * 0.7 = 1050 mA/h。 每次交易时间为 50ms, 耗电约 30mA, 理想状态下可交易次数约为: 1050/ ( 0.05/3600*30 ) = 252万次。
如果一直处于误唤醒接收状态下,电池的耗电时间约 1050/16=65.6小时, 即 3天就没电了。
通过 14K匹配, 即使处于误唤醒状态下, 电流只有 140uA, 是之前电流 的 1/90, 即可以坚持约 5740小时。 看来通过误唤醒匹配, 电池寿命变为原来 的约 90倍, 可以满足实际使用要求。
以上仅为本发明的优选实施案例而已, 并不用于限制本发明, 本发明还
可有其他多种实施例, 在不背离本发明精神及其实质的情况下, 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形, 但这些相应的改变和 变形都应属于本发明所附的权利要求的保护范围。
显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并 且在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件 结合。
工业实用性 上述射频识别***中解决有源标签误唤醒的方法, 降低有源标签成本, 解决有源标签被误唤醒的缺陷, 降低有源标签的功耗; 此外, 减小了有源标 签体积, 能满足多种应用场景。
Claims
1、 一种唤醒信号匹配方法, 其应用于射频识别***, 所述方法包括: 阅读器向标签发送唤醒信号,所述唤醒信号由固定频率的多个方波组成; 所述标签通过匹配方波的方式判断是否接收到唤醒信号, 若判断出接收 到唤醒信号, 则从休眠状态切换到工作状态。
2、 如权利要求 1所述的方法, 其中,
所述标签通过匹配方波的方式判断是否接收到唤醒信号的步骤包括: 所述标签判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如 果达到, 则判定接收到唤醒信号。
3、 如权利要求 2所述的方法, 其中,
所述标签判断连续匹配到方波的个数是否达到预定的匹配方波个数的步 骤包括:
统计连续方波跳变中断的个数是否达到预定的跳变个数, 如果达到, 则 判定连续匹配到方波的个数达到预定的所述匹配方波个数;
其中, 所述跳变个数为所述匹配方波个数加 2。
4、 如权利要求 2或 3所述的方法, 其还包括:
在第二个方波上升沿或下降沿中断启动定时器进行计时, 在第 N个方波 上升沿或下降沿中断时确定所述定时器的计时时间, 并才艮据所述计时时间判 断是否满足方波的频率范围, 若满足, 则判定匹配到该第 N个方波; 若不满 足, 则判定未匹配到该第 N个方波; 其中, N大于等于 3。
5、 一种标签, 其包括唤醒信号匹配单元,
所述唤醒信号匹配单元设置为: 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
6、 如权利要求 5所述的标签, 其中,
所述唤醒信号匹配单元是设置为以如下方式通过匹配方波的方式判断是 否接收到唤醒信号: 判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如果达到, 则判定接收到唤醒信号。
7、 如权利要求 6所述的标签, 其中,
所述唤醒信号匹配单元还设置为: 在第二个方波上升沿或下降沿中断启 动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述定时器的 计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若满足, 则 判定匹配到该第 N个方波; 若不满足,则判定未匹配到该第 N个方波; 其中, N大于等于 3。
8、 一种唤醒信号匹配装置, 其应用于射频识别***, 所述装置包括阅读 器和标签, 所述阅读器包括唤醒信号发送单元, 所述标签包括唤醒信号匹配 单元, 其中:
所述唤醒信号发送单元设置为: 向标签发送唤醒信号, 所述唤醒信号由 固定频率的多个方波组成;
所述唤醒信号匹配单元设置为: 通过匹配方波的方式判断是否接收到唤 醒信号, 若判断出接收到唤醒信号, 则从休眠状态切换到工作状态。
9、 如权利要求 8所述的装置, 其中,
所述唤醒信号发送单元是设置为通过空口命令向所述标签发送所述唤醒 信号;
所述唤醒信号匹配单元是设置为按照以下匹配方波的方式判断是否接收 到唤醒信号: 判断连续匹配到方波的个数是否达到预定的匹配方波个数, 如 果达到, 则判定接收到唤醒信号。
10、 如权利要求 9所述的装置, 其中,
所述唤醒信号匹配单元还设置为: 在第二个方波上升沿或下降沿中断启 动定时器进行计时, 在第 N个方波上升沿或下降沿中断时确定所述定时器的 计时时间, 并根据所述计时时间判断是否满足方波的频率范围, 若满足, 则 判定匹配到该第 N个方波; 若不满足,则判定未匹配到该第 N个方波; 其中, N大于等于 3。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201110161922.7 | 2011-06-16 | ||
CN201110161922.7A CN102831364B (zh) | 2011-06-16 | 2011-06-16 | 一种唤醒信号匹配方法、装置及标签 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012171297A1 true WO2012171297A1 (zh) | 2012-12-20 |
Family
ID=47334497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2011/082159 WO2012171297A1 (zh) | 2011-06-16 | 2011-11-14 | 一种唤醒信号匹配方法、装置及标签 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN102831364B (zh) |
WO (1) | WO2012171297A1 (zh) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104680100A (zh) * | 2013-12-03 | 2015-06-03 | 北京中电华大电子设计有限责任公司 | 一种有源rfid低功耗周期唤醒方法 |
CN105512696B (zh) * | 2014-09-25 | 2018-09-14 | 北京浪奇捷联科技开发有限公司 | 区域识别统计方法、有源电子标签及区域识别统计*** |
CN107862231B (zh) * | 2017-11-23 | 2021-02-19 | 重庆华虹电子有限公司 | 一种防止电子标签误唤醒*** |
CN110309093B (zh) * | 2019-06-17 | 2021-06-22 | 深圳和而泰小家电智能科技有限公司 | 一种数据传输电路以及方法 |
CN110264649B (zh) * | 2019-06-26 | 2022-10-14 | 佛山市顺德区海得曼电器有限公司 | 无线门铃的省电方法 |
CN113406945B (zh) * | 2021-05-26 | 2022-11-18 | 东风电驱动***有限公司 | 一种宽域频率唤醒信号处理方法及装置 |
CN113660714B (zh) * | 2021-07-30 | 2024-04-26 | 烟台东方威思顿电气有限公司 | 基于特定特征码的低功耗唤醒方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101122945A (zh) * | 2006-08-11 | 2008-02-13 | 香港中文大学 | Rfid***以及在节能模式下操作该***的方法 |
CN101441706A (zh) * | 2008-11-28 | 2009-05-27 | 武汉理工大学 | 有源电子标签的双激活方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8830035B2 (en) * | 2005-06-30 | 2014-09-09 | Farpointe Data, Inc. | Power consumption management for an RFID reader |
-
2011
- 2011-06-16 CN CN201110161922.7A patent/CN102831364B/zh active Active
- 2011-11-14 WO PCT/CN2011/082159 patent/WO2012171297A1/zh active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101122945A (zh) * | 2006-08-11 | 2008-02-13 | 香港中文大学 | Rfid***以及在节能模式下操作该***的方法 |
CN101441706A (zh) * | 2008-11-28 | 2009-05-27 | 武汉理工大学 | 有源电子标签的双激活方法 |
Also Published As
Publication number | Publication date |
---|---|
CN102831364A (zh) | 2012-12-19 |
CN102831364B (zh) | 2016-11-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2012171297A1 (zh) | 一种唤醒信号匹配方法、装置及标签 | |
EP2509032B1 (en) | Application system and method thereof | |
WO2010037330A1 (zh) | 降低射频sim卡在待机模式下功耗的方法 | |
WO2014110842A1 (zh) | 一种电子标签快速识别的方法及装置 | |
CN102612122A (zh) | 一种低功耗无线传感器网络***及其控制唤醒方法 | |
WO2010051728A1 (zh) | 采用序列触发降低射频sim卡待机功耗的方法 | |
CN105050025A (zh) | 一种基于低功耗蓝牙射频唤醒方法及装置 | |
CN103745181B (zh) | 一种低频激活有源标签的防冲突方法 | |
US20140220886A1 (en) | Connection and synchronization with a device in a non-active state based on near field communication | |
CN102184445B (zh) | 电子标签唤醒方法及电子标签 | |
CN112232463B (zh) | 低功耗rfid读写***及方法 | |
CN102521555A (zh) | 一种唤醒信号匹配方法 | |
CN113141571A (zh) | Uwb通信装置和对应的操作方法 | |
CN102831452A (zh) | 一种有源rfid***的低功耗运行方法 | |
CN102110223A (zh) | 一种rfid远距离读卡***及其方法 | |
CN201181479Y (zh) | 一种有源身份识别标签 | |
CN101093549A (zh) | 射频识别***的读写器的数据读取及标签的数据发送方法 | |
WO2009131197A1 (ja) | リーダライタ、および、プログラム | |
CN102799839B (zh) | 有源rfid***同步唤醒通信的方法 | |
CN106779019A (zh) | 一种智能包装的超低功耗无线传感标签硬件 | |
KR101001681B1 (ko) | 능동형 rfid 시스템 및 그의 태그 웨이크 업 제어 방법 | |
CN103605996B (zh) | 一种有源射频识别*** | |
JP7394472B2 (ja) | 低消費電力で通信衝突を低減する無線周波数識別通信方法及びそれを使用する無線周波数識別通信システム | |
EP4210234A1 (en) | Communication device and operating method | |
Huang et al. | The Design of the management system for parking lot based on 2.45 GHz active RFID |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11867921 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11867921 Country of ref document: EP Kind code of ref document: A1 |