CN107844725A - NFC load modulator approach and device - Google Patents
NFC load modulator approach and device Download PDFInfo
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- CN107844725A CN107844725A CN201711012108.2A CN201711012108A CN107844725A CN 107844725 A CN107844725 A CN 107844725A CN 201711012108 A CN201711012108 A CN 201711012108A CN 107844725 A CN107844725 A CN 107844725A
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- 230000001133 acceleration Effects 0.000 claims description 48
- 230000005484 gravity Effects 0.000 claims description 15
- 238000013507 mapping Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 230000002452 interceptive effect Effects 0.000 claims description 7
- 230000002153 concerted effect Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- H04B5/72—
Abstract
The embodiment of the present invention, which provides the load modulator approach of NFC a kind of and device, this method, to be included：When receiving the solicited message of reader device, the current motion state of NFC terminal is determined, selects load modulating mode corresponding to current motion state, and uses load modulating mode corresponding to current motion state to reader device transmission response information.Realizing can flexibly determine to load modulating mode according to the motion state of NFC terminal, with the situation for the failure that avoids swiping the card as far as possible, especially for the reader device for needing multiple read-write card, can avoid as far as possible due to being swiped the card unsuccessfully caused by pattern switching.
Description
Technical field
The present invention relates to the load modulator approach and device of the terminal communication technology, more particularly to a kind of NFC.
Background technology
Near field communication (Near Field Communication, abbreviation NFC) technology is known by non-contact radio-frequency
(Radio Frequency Identification, abbreviation RFID) and the Technology Integration that interconnects are not developed, single
Combining induction card reader, icah wavw and point-to-point function, can be known in short distance with compatible equipment on chip
Other and data exchange.At present, NFC is also more and more extensive in the application of terminal, helps user to realize the work(such as information transmission, payment
Energy.Specifically, NFC is using the information/data interaction between load modulation technology terminal and card reader.
Early stage NFC mainly modulates (Passive Load Modulation, abbreviation PLM) using passive load, but due to
Reader device species is various and diversified in specifications in practical application, and single PLM can not sometimes meet penetrating for card-reading apparatus
Frequency demand.Then in the prior art, it is proposed that modulate (Active Load Modulation, abbreviation ALM) with reference to active load
(Multiple Load Modulation, abbreviation MLM) is modulated with PLM multi-load, under this modes of MLM, terminal is received
Interacted after to the radiofrequency signal of reader device first by ALM dynamic adjustment load modulation amplitudes with reader device,
If ALM adjustment of load amplitude is not in the response range of reader device, then switches to PLM to carry out load modulation.
But first ALM fixed configurations are used in this modes of MLM, under some scenes, such as need to complete repeatedly to read
In the case of writing, read-write failure is likely to result in.
The content of the invention
The embodiment of the present invention provides a kind of NFC load modulator approach and device, may for solving existing card-reading mode
There is the problem of to NFC terminal card read failed.
In a first aspect, the embodiment of the present invention provides a kind of NFC load modulator approach, including：
When receiving the solicited message of reader device, the current motion state of near field communication NFC terminal is determined；
According to the current motion state and motion state and the mapping relations of load modulating mode, selection is described to work as
Load modulating mode corresponding to preceding motion state；
Using loading modulating mode corresponding to the current motion state to the reader device transmission response information.
It is alternatively, described according to the current motion state and motion state and the mapping relations of load modulating mode,
Load modulating mode corresponding to the current motion state is selected, including：
When the current motion state is relative motion, active load modulation ALM patterns are selected；Or
When the current motion state is geo-stationary, passive load modulation PLM patterns are selected.
Alternatively, the current motion state for determining near field communication NFC terminal, including：
The kinematic parameter of the NFC terminal is gathered using acceleration transducer, wherein, the kinematic parameter includes：X-axis adds
Speed ax, y-axis acceleration ay, z-axis acceleration az；
According to the kinematic parameter, gravity acceleration g and preset algorithm, the current kinetic shape of the NFC terminal is determined
State.
Alternatively, it is described according to the kinematic parameter, acceleration of gravity and preset algorithm, determine the NFC terminal
Current motion state, including：
According to formulaObtain the NFC terminal make a concerted effort acceleration with it is described heavy
The difference of power acceleration；
When the difference is more than the first predetermined threshold value, the current motion state for determining the NFC terminal is relative motion；
When the difference is less than or equal to first predetermined threshold value, the slope of the NFC terminal x-axis, y-axis are obtained
The slope of slope and z-axis, when the slope of slope, y-axis and the slope of z-axis in the x-axis are satisfied by preparatory condition, it is determined that
The current motion state of the NFC terminal is geo-stationary.
Alternatively, it is described to be transmitted using load modulating mode corresponding to the current motion state to the reader device
After response message, in addition to：
If transmit the response message failure, it is determined that switching present load modulating mode.
Second aspect, the embodiment of the present invention provide a kind of NFC load modulating device, including：
Determining module, during solicited message for receiving reader device, determine working as near field communication NFC terminal
Preceding motion state；
Selecting module, for being closed according to the current motion state and motion state and the mapping of load modulating mode
System, select load modulating mode corresponding to the current motion state；
Interactive module, for being passed using load modulating mode corresponding to the current motion state to the reader device
Defeated response message.
Alternatively, the selecting module, specifically for when the current motion state is relative motion, selection is actively negative
Carry modulation ALM patterns；Or when the current motion state is geo-stationary, select passive load modulation PLM patterns.
Alternatively, the determining module, join specifically for the motion that the NFC terminal is gathered using acceleration transducer
Number, wherein, the kinematic parameter includes：X-axis acceleration ax, y-axis acceleration ay, z-axis acceleration az；Joined according to the motion
Number, gravity acceleration g and preset algorithm, determine the current motion state of the NFC terminal.
Alternatively, the determining module, specifically for according to formulaObtain
The NFC terminal is made a concerted effort the difference of acceleration and the acceleration of gravity；When the difference is more than the first predetermined threshold value, it is determined that
The current motion state of the NFC terminal is relative motion；When the difference is less than or equal to first predetermined threshold value, obtain
Take the slope, the slope of y-axis and the slope of z-axis of the NFC terminal x-axis, the slope and z of slope, y-axis in the x-axis
When the slope of axle is satisfied by preparatory condition, the current motion state for determining the NFC terminal is geo-stationary.
Alternatively, the determining module, it is additionally operable to when the interactive module transmits the response message failure, it is determined that cutting
Change present load modulating mode.
NFC provided by the invention load modulator approach and device, when receiving the solicited message of reader device, it is determined that
The current motion state of NFC terminal, load modulating mode corresponding to current motion state is selected, and use current motion state pair
The load modulating mode answered is to reader device transmission response information.Realizing can be flexible according to the motion state of NFC terminal
It is determined that load modulating mode, with the situation for the failure that avoids swiping the card as far as possible, sets especially for the card reader of multiple read-write card is needed
It is standby, it can avoid as far as possible due to being swiped the card unsuccessfully caused by pattern switching.
Brief description of the drawings
Fig. 1 is the load modulator approach schematic flow sheet for the NFC that the embodiment of the application one provides；
Fig. 2 is the load modulator approach schematic flow sheet for the NFC that another embodiment of the application provides；
Fig. 3 is a kind of load modulating device structural representation for NFC that the embodiment of the application one provides.
Embodiment
There is the terminal (being referred to as in the application " NFC terminal ") of NFC function at present, using this load modulation methods of MLM
Formula, i.e. terminal are set after receiving the radiofrequency signal of reader device first by ALM dynamic adjustment load modulation amplitudes with card reader
It is standby to interact, if ALM adjustment of load amplitude is not in the response range of reader device, then switch to PLM to be born
Carry modulation.This MLM modes in some scenarios and do not apply to, such as：To supplement with money under scene, reader device is to supplement equipment with money,
Then supplement equipment with money first will write the new amount of money, then read new remaining sum by NFC terminal reading balance amount.Due to NFC terminal
Read sensitivity and write-in sensitivity it is different, in ALM, data can be read by supplementing equipment with money, if but write-in when still use ALM
May can fail, repeatedly read-write be present if failure will be switched to PLM and be write, during this, during it is negative
Load modulation system, which switches over, is possible to that switching overtime can be caused, and then causes entirely to read and write procedure failure, that is, swipes the card unsuccessfully.
In the application, the load modulation methods of NFC a kind of are proposed for the problem of read-write failure of NFC terminal in the prior art
Method, the motion state of this method combination NFC terminal, more neatly select the load modulation for being adapted to current scene.
Fig. 1 is the load modulator approach schematic flow sheet for the NFC that the embodiment of the application one provides.The executive agent of this method
Can be NFC terminal, as shown in figure 1, this method includes：
S101, when receiving the solicited message of reader device, determine the current motion state of NFC terminal.
It should be noted that after NFC terminal start, NFC function can be started, or, can also be by the manually opened NFC of user
Function.Usually, under NFC function opening, if detecting that NFC is opened, NFC firmwares and configuration file are loaded, just
Beginningization NFC chip configures.
In implementation process, when distance of the NFC terminal between reader device is less than pre-determined distance, card reader can be received
The solicited message of equipment.The solicited message can be the data protocol bag of preset protocol, for asking the correlation of reading NFC terminal
Data.
S102, according to current motion state and motion state and the mapping relations of load modulating mode, select current fortune
Load modulating mode corresponding to dynamic state.
Can be with preset in advance sports-like state and the mapping relations of load modulating mode, such as before NFC terminal is dispatched from the factory just
Mapping relations are configured or are provided in NFC terminal and interface is set so that user can be on interface be set in configuration
State mapping relations.It is determined that after current motion state, load modulating mode corresponding to current motion state is enabled.
When presetting mapping relations of the motion state with loading modulating mode, it can consider under certain motion state, it is assorted
Load modulating mode Card Reader has higher success rate, with the situation for the failure that avoids swiping the card as far as possible.
S103, using loading modulating mode corresponding to current motion state to reader device transmission response information.
NFC terminal feeds back a response message, to complete to hand in the case where loading modulating mode corresponding to current motion state
Mutually.
In the present embodiment, when receiving the solicited message of reader device, the current motion state of NFC terminal is determined, is selected
Load modulating mode corresponding to current motion state is selected, and using the corresponding modulating mode that loads of current motion state to card reader
Equipment transmission response information.Realizing can flexibly determine to load modulating mode according to the motion state of NFC terminal, to keep away as far as possible
Exempt to swipe the card the situation of failure, especially for the reader device for needing multiple read-write card, can avoid as far as possible because pattern is cut
Swiped the card unsuccessfully caused by changing.
In a kind of possible embodiment, according to current motion state and motion state with loading reflecting for modulating mode
Relation is penetrated, selects load modulating mode, Ke Yiwei corresponding to current motion state：
When current motion state is relative motion, ALM patterns are selected.Or
When current motion state is geo-stationary, PLM patterns are selected.
Certainly, it is not limited with above-mentioned embodiment, user can configure motion state at the setting interface of NFC terminal oneself
Mapping relations with loading modulating mode.Such as user sets NFC terminal to select MLM patterns etc. in geo-stationary.
It should be noted that experiment shows, ALM success rates of swiping the card are higher when motion state is relative motion, and relatively quiet
PLM, which swipes the card, when only has higher success rate.Such as the subway public transport scene such as come in and go out is typically all a dynamic state of swiping the card, Yong Hu
It is close but data interaction has been completed during not completely attaching to the reader devices such as gate to brandish NFC terminal, under such scene
Higher success rate of swiping the card can be obtained from the stronger ALM patterns of load modulation amplitude, lifts experience of swiping the card.And for example supplement with money
It is when resting on the induction region for supplement with money reader device to carry out read-write operation, to loading modulation amplitude etc. scene NFC terminal
It is required that it is relatively low, the problem of can meeting success rate using PLM patterns, and can avoid supplementing with money unsuccessfully as far as possible.
Further, the current motion state of above-mentioned determination NFC terminal can include：Institute is gathered using acceleration transducer
The kinematic parameter of NFC terminal is stated, and according to kinematic parameter, gravity acceleration g and preset algorithm, determines the current of NFC terminal
Motion state.
Wherein, kinematic parameter includes：X-axis acceleration ax, y-axis acceleration ay, z-axis acceleration azDeng.
After NFC terminal starts, can with starting loop sensor, and then when receiving the solicited message of reader device,
Determine the current motion state of NFC terminal.
More specifically, according to kinematic parameter, gravity acceleration g and preset algorithm, the current kinetic shape of NFC terminal is determined
State, can be according to formulaObtain the NFC terminal make a concerted effort acceleration with it is described
The difference of acceleration of gravity.
When difference △ gar are more than the first predetermined threshold value, the current motion state for determining NFC terminal is relative motion.
When difference △ gar are less than or equal to the first predetermined threshold value, it is also necessary to further determined according to slope current
Whether motion state is geo-stationary.Slope, the slope of y-axis and the slope of z-axis of NFC terminal x-axis are obtained, in x-axis
When the slope of slope, the slope of y-axis and z-axis is satisfied by preparatory condition, the current motion state for determining the NFC terminal is relative
It is static.Alternatively, the first predetermined threshold value can take 1.0, but be not limited.Gravity acceleration g can take standard value
9.80665。
It should be noted that the amplitude of variation of data is can be seen that by slope, and in relative static conditions, the ripple of data
Dynamic very little, slope variation are more stable；And if motion state, slope variation is then relatively more violent.
Specifically, in order to more accurately determine motion state, NFC terminal can gather multigroup motion of acceleration transducer
Parameter.
The slope of x-axisEvent [i] .x represents i-th
X-axis acceleration in group kinematic parameter, event [i] .timestamp represent to obtain the timestamp of i-th group of kinematic parameter.
The slope of y-axisEvent [i] .y represents i-th
Y-axis acceleration in group kinematic parameter, event [i] .timestamp represent to obtain the timestamp of i-th group of kinematic parameter.
The slope of z-axisEvent [i] .z represents i-th
Z-axis acceleration in group kinematic parameter, event [i] .timestamp represent to obtain the timestamp of i-th group of kinematic parameter.
The slope of the slope of x-axis, the slope of y-axis and z-axis is satisfied by preparatory condition, can be the slope of axle, y-axis it is oblique
The slope of rate and z-axis is respectively less than the second predetermined threshold value.
Alternatively, second predetermined threshold value can be 25.0.The value is the result drawn based on data observation, 25.0 energy
Preferable balance is obtained in accuracy rate and time delay.
On the basis of above-described embodiment, using loading modulating mode corresponding to the current motion state to the Card Reader
After device equipment transmission response information, NFC terminal be can decide whether to respond successfully, and interaction is completed if success.If in transmission
State response message failure, it is determined that switching present load modulating mode.I.e. if interaction failure, another load modulation mould is just changed
Formula re-starts interaction, such as is currently ALM patterns, interaction failure, switches to PLM patterns and re-starts interaction.
Fig. 2 is the load modulator approach schematic flow sheet for the NFC that another embodiment of the application provides, as shown in Fig. 2 with one
Individual read-write card process is for example, may include steps of：
S201, NFC terminal receive the solicited message of reader device, determine the current motion state of NFC terminal.
Current motion state is that relative motion performs S202~S205, and current motion state is that geo-stationary then performs S206
~S209.
If S202, current motion state are relative motion, it is ALM patterns that NFC terminal, which sets load modulating mode,.
S203, NFC terminal use ALM patterns to reader device transmission response information, and judge whether transmission success.
Interaction is completed, performs S204 if failure if success.
S204, NFC terminal switch to PLM patterns by modulating mode is loaded.
S205, NFC terminal use PLM patterns to reader device transmission response information, and judge whether transmission success.
Interaction is completed, performs S204 if failure if success.
If S206, current motion state are geo-stationary, it is PLM patterns that NFC terminal, which sets load modulating mode,.
S207, NFC terminal use PLM patterns to reader device transmission response information, and judge whether transmission success.
Interaction is completed, performs S210 if failure if success.
S208, NFC terminal switch to ALM patterns by modulating mode is loaded.
S209, NFC terminal use ALM patterns to reader device transmission response information, and judge whether transmission success.
Interaction is completed, performs S210 if failure if success.
S210, NFC terminal determine interaction failure.
It is not limited with above-mentioned embodiment, can continue to switch to other load modulating modes to re-start interaction,
Also non-interaction success determines to interact failure again after preset time, or reaches pre-determined threshold in the number of switching load modulating mode
Determine to interact failure again during value, the application is not restricted.
It can be seen that in the present embodiment, according to the high load modulating mode of motion state prioritizing selection interaction success rate, in interaction
During failure, other can also be switched to load modulating mode in time, to improve the possibility of interaction success.
Fig. 3 is a kind of load modulating device structural representation for NFC that the embodiment of the application one provides, and the device can be
Above-mentioned NFC terminal.As shown in figure 3, the device includes：Determining module 301, selecting module 302 and interactive module 303, wherein：
Determining module 301, during solicited message for receiving reader device, determine near field communication NFC terminal
Current motion state.
Selecting module 302, for according to the current motion state and motion state and the mapping of load modulating mode
Relation, select load modulating mode corresponding to the current motion state.
Interactive module 303, for being set using load modulating mode corresponding to the current motion state to the card reader
Standby transmission response information.
In the present embodiment, when receiving the solicited message of reader device, the current motion state of NFC terminal is determined, is selected
Load modulating mode corresponding to current motion state is selected, and using the corresponding modulating mode that loads of current motion state to card reader
Equipment transmission response information.Realizing can flexibly determine to load modulating mode according to the motion state of NFC terminal, to keep away as far as possible
Exempt to swipe the card the situation of failure, especially for the reader device for needing multiple read-write card, can avoid as far as possible because pattern is cut
Swiped the card unsuccessfully caused by changing.
Alternatively, selecting module 302, specifically for when the current motion state is relative motion, selection is actively negative
Carry modulation ALM patterns；Or when the current motion state is geo-stationary, select passive load modulation PLM patterns.
Further, it is determined that module 301, is joined specifically for the motion that the NFC terminal is gathered using acceleration transducer
Number, wherein, the kinematic parameter includes：X-axis acceleration ax, y-axis acceleration ay, z-axis acceleration az；Joined according to the motion
Number, gravity acceleration g and preset algorithm, determine the current motion state of the NFC terminal.
In a kind of alternatively embodiment, determining module 301, specifically for according to formulaThe NFC terminal is obtained to make a concerted effort the difference of acceleration and the acceleration of gravity；
When the difference is more than the first predetermined threshold value, the current motion state for determining the NFC terminal is relative motion；In the difference
When value is less than or equal to first predetermined threshold value, the oblique of the slope of the NFC terminal x-axis, the slope of y-axis and z-axis is obtained
Rate, when the slope of slope, y-axis and the slope of z-axis in the x-axis are satisfied by preparatory condition, determine working as the NFC terminal
Preceding motion state is geo-stationary.
Optionally it is determined that module 301, is additionally operable to when the interactive module transmits the response message failure, it is determined that cutting
Change present load modulating mode.
The device is used to perform preceding method embodiment, and its implementing principle and technical effect is similar, will not be repeated here.
In several embodiments provided by the present invention, it should be understood that disclosed apparatus and method, it can be passed through
Its mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, only
Only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can be tied
Another system is closed or is desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or discussed
Mutual coupling or direct-coupling or communication connection can be the INDIRECT COUPLINGs or logical by some interfaces, device or unit
Letter connection, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in one and computer-readable deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are causing a computer
Equipment (can be personal computer, server, or network equipment etc.) or processor (English：Processor this hair) is performed
The part steps of bright each embodiment methods described.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage
(English：Read-Only Memory, referred to as：ROM), random access memory (English：Random Access Memory, letter
Claim：RAM), magnetic disc or CD etc. are various can be with the medium of store program codes.
Claims (10)
- A kind of 1. load modulator approach of NFC, it is characterised in that including：When receiving the solicited message of reader device, the current motion state of near field communication NFC terminal is determined；According to the current motion state and motion state and the mapping relations of load modulating mode, the current fortune is selected Load modulating mode corresponding to dynamic state；Using loading modulating mode corresponding to the current motion state to the reader device transmission response information.
- 2. according to the method for claim 1, it is characterised in that it is described according to the current motion state and motion shape State and the mapping relations of load modulating mode, load modulating mode corresponding to the current motion state is selected, including：When the current motion state is relative motion, active load modulation ALM patterns are selected；OrWhen the current motion state is geo-stationary, passive load modulation PLM patterns are selected.
- 3. method according to claim 1 or 2, it is characterised in that described to determine the current of near field communication NFC terminal Motion state, including：The kinematic parameter of the NFC terminal is gathered using acceleration transducer, wherein, the kinematic parameter includes：X-axis acceleration ax, y-axis acceleration ay, z-axis acceleration az；According to the kinematic parameter, gravity acceleration g and preset algorithm, the current motion state of the NFC terminal is determined.
- 4. according to the method for claim 3, it is characterised in that it is described according to the kinematic parameter, acceleration of gravity and Preset algorithm, the current motion state of the NFC terminal is determined, including：According to formulaNFC terminal acceleration of making a concerted effort is obtained with the gravity to add The difference of speed；When the difference is more than the first predetermined threshold value, the current motion state for determining the NFC terminal is relative motion；When the difference is less than or equal to first predetermined threshold value, slope, the slope of y-axis of the NFC terminal x-axis are obtained And the slope of z-axis, when the slope of slope, y-axis and the slope of z-axis in the x-axis are satisfied by preparatory condition, it is determined that described The current motion state of NFC terminal is geo-stationary.
- 5. according to the method for claim 1, it is characterised in that described to be adjusted using load corresponding to the current motion state Molding formula to after the reader device transmission response information, in addition to：If transmit the response message failure, it is determined that switching present load modulating mode.
- A kind of 6. load modulating device of NFC, it is characterised in that including：Determining module, during solicited message for receiving reader device, determine the current fortune of near field communication NFC terminal Dynamic state；Selecting module, for according to the current motion state and motion state and the mapping relations of load modulating mode, choosing Select load modulating mode corresponding to the current motion state；Interactive module, rung for being transmitted using load modulating mode corresponding to the current motion state to the reader device Answer information.
- 7. device according to claim 6, it is characterised in that the selecting module, specifically in the current kinetic When state is relative motion, active load modulation ALM patterns are selected；Or when the current motion state is geo-stationary, Select passive load modulation PLM patterns.
- 8. the device according to claim 6 or 7, it is characterised in that the determining module, specifically for being passed using acceleration Sensor gathers the kinematic parameter of the NFC terminal, wherein, the kinematic parameter includes：X-axis acceleration ax, y-axis acceleration ay、z The acceleration a of axlez；According to the kinematic parameter, gravity acceleration g and preset algorithm, the current fortune of the NFC terminal is determined Dynamic state.
- 9. device according to claim 8, it is characterised in that the determining module, specifically for according to formulaThe NFC terminal is obtained to make a concerted effort the difference of acceleration and the acceleration of gravity； When the difference is more than the first predetermined threshold value, the current motion state for determining the NFC terminal is relative motion；In the difference When value is less than or equal to first predetermined threshold value, the oblique of the slope of the NFC terminal x-axis, the slope of y-axis and z-axis is obtained Rate, when the slope of slope, y-axis and the slope of z-axis in the x-axis are satisfied by preparatory condition, determine working as the NFC terminal Preceding motion state is geo-stationary.
- 10. device according to claim 9, it is characterised in that the determining module, be additionally operable to pass in the interactive module During the defeated response message failure, it is determined that switching present load modulating mode.
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| CN201711012108.2A CN107844725B (en) | 2017-10-26 | 2017-10-26 | Load modulation method and device of NFC |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110958562A (en) * | 2019-11-28 | 2020-04-03 | Oppo广东移动通信有限公司 | Modulation mode selection method, near field communication device and storage medium |
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