CN101304299B - Method for improving symmetry in data transmission in logic link control layer - Google Patents
Method for improving symmetry in data transmission in logic link control layer Download PDFInfo
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- CN101304299B CN101304299B CN200810127728.5A CN200810127728A CN101304299B CN 101304299 B CN101304299 B CN 101304299B CN 200810127728 A CN200810127728 A CN 200810127728A CN 101304299 B CN101304299 B CN 101304299B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
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- 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
Abstract
The invention relates to a data sending/receiving method used for improving a data throughput in a near field communication (NFC). A communication between a first NFC device and a second NFC device which carry out the NFC comprises: (a) the first NFC device sends data frames to the second NFC device; (b) the second NFC device arranges an indication that more data exists or not in a bit of logical link control (LLC) information frames, and sends the LLC information frames as response frames which respond to the data frames sent by the first NFC device; and (c) the first FNC device examines the bit of the response frames, and waits for predetermined time according to examination result or doesn't wait for the predetermined time to immediately send the next transmission data bit.
Description
Technical field
The present invention relates to the data sending/receiving method in near-field communication (NFC).In more detail, the method for the data throughout between the present invention relates to for raising equipment.
Background technology
Near-field communication (NFC) for mutual spacing from the communication between the equipment typically within about 10cm.In NFC protocol stack, NFCIP-1 standard is used in the physical layer of ISO 14443.In NFCIP-1, the equipment (or NFCIP-1 equipment) for NFC can run on aggressive mode or Passive Mode.The NFCIP-1 equipment be in sending mode is called startup side, and the NFCIP-1 equipment be in receiving mode is called target side.
In Passive Mode, NFCIP-1 equipment not used for radio frequency (RF) field of himself modulation needed for the power supply of oneself, therefore can not oneself generate request message.In Passive Mode, always be and communicate by startup side.In other words, once the startup side had the initiative in pattern is sent a request message by RF field, be then in the target side power drives receiver circuit provided by RF field in Passive Mode.If data are not transmitted in startup side, this startup side periodically sends symmetrical (SYMM) frame at least one target side.In response to receiving this SYMM frame or information (I) frame that come from this startup side, target direction startup side sends the received frame inserting its data wherein back to.Therefore, the frequency of I frame or the SYMM frame received from startup side is depended on from the throughput (i.e. message transmission rate) of the data of target side transmission.
And in current logic link control protocol (LLCP) version, startup side must wait for a period of time to receive response frame after sending request frame.Because this is waited for, transfer of data may postpone due to response wait time (RWT).Under this mechanism, the one-way data transfer coming from target side inevitably depends on the frequency used from the SYMM frame starting direction target side transmission.
As the result of above-mentioned RWT, when the data volume that will send between NFC device increases, the message transmission rate between NFC device reduced due to unnecessary free time or stand-by period.
For solving those problems, need the basic skills for improving the message transmission rate between NFC device.
Summary of the invention
An aspect of of the present present invention solves the above problems and/or at least some in shortcoming, and at least provide following advantage.Therefore, the method for unnecessary stand-by period generated during the data sending/receiving that an aspect of of the present present invention is to provide for reducing between near-field communication (NFC) equipment.
According to demonstration aspect of the present invention, provide in a kind of transfer of data of logic link control (LLC) layer for near-field communication (NFC) equipment in equity and improve symmetric method, wherein, bit in LLC information frame is set to ' 0 ' or ' 1 ', and is used as more data bit indicator.
When target side or startup side have one or more Frame will send to startup side or target side, described more data bit indicator can be set.
Such as, when receiving information (I) frame, the target side (or startup side) having received I frame checks whether and is provided with bit, if and be provided with bit and target side or startup side do not have other frame to send, then target side or startup side send symmetry (SYMM) frame and the idle timer of the SYMM counter expires to be instructed such as not immediately.
In addition, according to demonstration aspect of the present invention, before transmission first symmetry (SYMM) frame is to target side, startup can start idle timer and wait for that idle timer expires.
Startup can receive from target side the first response frame wherein bit being set to ' 0 ', and starts idle timer for SYMM frame sends.
According to another demonstration aspect of the present invention, provide a kind of method for carrying out communicating between the first near-field communication (NFC) equipment using NFC to carry out communicating and the second NFC device.The method comprises: (a) first NFC device to second NFC device send Frame; (b) second NFC device arrange in the bit of logic link control (LLC) information frame and there is or do not exist the instruction of more data, and this LLC information frame to be sent as the response frame being used for responding the Frame sent from the first NFC device; And (c) first NFC device check the bit of described response frame, and wait for the scheduled time according to check result or send next transmission data bit immediately and do not wait for the scheduled time.
LLC information frame can comprise information (I) frame and unnumbered information (UI) frame.
Described bit can comprise the 4th bit of such as control field.
According to demonstration aspect of the present invention, if described bit is set to ' 0 ' at (b), then the first NFC device can send next frame after (c) waits for the scheduled time, if and at (b), described bit is set to ' 1 ', then the first NFC device can not waited for the scheduled time at (c) and send next frame immediately.
Frame can comprise such as SYMM frame, and LLC information frame can comprise the response frame for responding SYMM frame.
Accompanying drawing explanation
According to detailed description below with reference to the accompanying drawings, the above-mentioned and further feature of example embodiment of the present invention and advantage will be more obvious, wherein:
Fig. 1 illustrates the structure of information (I) frame that example embodiment according to the present invention generates;
Fig. 2 illustrates the structure of unnumbered information (UI) frame that example embodiment according to the present invention generates;
Fig. 3 illustrates the structure of the control field according to example embodiment of the present invention; And
Fig. 4 be a diagram that the staircase chart of the data sending/receiving method according to example embodiment of the present invention.
Run through in accompanying drawing, identical accompanying drawing reference marker is interpreted as and points to identical element, characteristic sum structure.
Embodiment
There is provided the content defined in specification, such as detailed structure and element, help those of ordinary skill in the art and fully understand example embodiment of the present invention.Be provided in the example that this comprises, be in order to illustrated object, and the example provided at this is not provided.Thus, persons of ordinary skill in the art will recognize that the variations and modifications can carrying out example embodiment described herein, and do not depart from the scope of the present invention and spirit.In addition, the description of known function and configuration can be omitted, with the understanding of the present invention that do not made those skilled in the art fuzzy.
Near-field communication (NFC) can be performed by the data sending/receiving between the side of startup and target side.Startup side periodically generates and output comprises radio frequency (RF) field of symmetry (SYMM) frame.Once target side enters the region of RF field, then target side operates as power supply by using the RF signal received from startup side.Target side load-modulate (load-modulate) RF signal, send response frame when responding SYMM frame to passback thus.
Fig. 1 illustrates the structure of information (I) frame 100 that example embodiment according to the present invention generates, and Fig. 2 illustrates the structure of unnumbered information (UI) frame 200 that example embodiment according to the present invention generates.With reference to Fig. 1 and 2, comprise according to each of the I frame 100 of example embodiment of the present invention and UI frame 200: object Service Access Point (DSAP) field 10 comprising destination address, source service access point (SSAP) field 20 comprising source address, control field 30 and data information field 40 (for I frame) or 50 (for UI frames).
For both I frame 100 and UI frame 200, dsap field 10, ssap field 20 and control field 30 typically have identical size and structure.On the other hand, for I frame 100 and UI frame 200 differently arrange respective data information field 40 and 50.Or rather, the data information field 40 be included in I frame 100 comprises: field 43, for recording multiple data packet units; With field 42, for recording the sequence number of the data packet units (or first data packet units) that first sends.The data information field 40 of I frame may further include the field 41 for recording responses sequence number, and this response sequence number is set to corresponding with the sequence number of last data packet units.
Still with reference to figure 1, response sequence number can be set to corresponding with last data packet units, this last data packet units is last in the data packet units that comprises of the payload of data information field 40.Response sequence number can be that the sequence number of the data packet units (or last data packet units) such as finally comprised increases by a value, including, but not limited to increasing by one.Such as, suppose that the data information field 40 of I frame comprises total 3 data packet units, and be set to 4 for the field 42 of the sequence number recording the first data packet units.Typically, the sequence number sequentially distributing serial numbers of three data packet units in data information field 40 based on first data packet units is included in.Therefore, such as, in data information field 40, the sequence number of last data packet units can be 6.In field 41, response sequence number can be set to 7, and this 7 is increase by 1 value obtained from the sequence number (namely 6) of last data packet units.Those of ordinary skill in the art is to be understood that and recognizes, the present invention can use the value except given sequence increase by 1.
With reference now to Fig. 2, the data information field 50 not resembling I frame 100, the UI frame 200 shown in Fig. 1 only comprises multiple data packet units and not used for the field of records series number.
Fig. 3 illustrates some exemplary details of the structure of the control field 30 according to example embodiment of the present invention.The control field 30 that I frame 100 and UI frame 200 comprise typically has the size of 1 byte, wherein record order (being indicated by Reference numeral 31) in the 0 to the 3 bit.
In the present invention, add designator, it provides the instruction about whether there is more data frame in the transmit queue of transmitting apparatus.Therefore, in example embodiment of the present invention, by use the 4th bit (being indicated by Reference numeral 32) indicate in I frame 100 or UI frame 200 exist or there is not more data, do not define the 4th bit independently in LLCP specification.The information be recorded in the 4th bit can be defined as follows.
[table 1]
| Controlling value | Indication information |
| 0 | There is not more data frame |
| 1 | There is more data frame |
In Table 1, there is more data frame in ' 0 ' instruction, and ' 1 ' instruction does not exist more data frame in the transmit queue of transmitting apparatus in the transmit queue of transmitting apparatus.
Such as, in the 5th and the 6th bit (being indicated by Reference numeral 33) of control field 30, record is used to indicate the information of frame type.The information of record can be defined as follows:
[table 2]
| Controlling value | Indication information |
| 00 | Supervision |
| 01 | UI frame |
| 10 | I frame |
| 11 | Other |
In table 2, ' 00 ' instruction is used to indicate electrical combination or applies the supervisory signals of the several modes of operation changed, and the frame of ' 01 ' instruction correspondence is UI frame, and the frame of ' 10 ' instruction correspondence is I frame.Like this, can identify that corresponding Frame is I frame or UI frame by the 5th and the 6th bit of use control field 30.
The data sending/receiving method according to the use aforementioned data frame structure of example embodiment of the present invention will be described now.
Fig. 4 be a diagram that the staircase chart of the data sending/receiving method according to example embodiment of the present invention.With reference to figure 4, in step 110, startup side periodically sends SYMM frame to target side, and target direction startup side sends back UI frame, as the response to the SYMM frame periodically received from startup side.If logic link control (LLC) layer does not have more data frame, then in the step 120, target side sends LLC UI frame to startup side afterwards what the 4th bit of control field is set to ' 0 '.
In step 130, when receiving the UI frame coming from target side, starting direction target side and sending SYMM frame.
Still with reference to figure 4, according to example data sending/receiving method of the present invention, preferably, data sending/receiving method can comprise step 125 before step 130.In step 125, recognize that the startup side that the 4th bit of the control field of the UI frame of reception is set to ' 0 ' starts SYMM timer, and wait for predetermined free time, until SYMM timer expiration.
If LLC layer comprises the Frame of one or more application layer, then in step 140, what target side was set to ' 1 ' at the 4th bit of the control field by LLC UI frame sends LLC UI frame afterwards to startup side.
Responsively, in step 150, recognize that the startup side that the 4th bit of the control field that the UI frame of reception comprises is set to ' 1 ' sends SYMM frame immediately and do not wait for free time.
In the diagram, step 150 to 180 can correspond to step 130 and 140.
And about whether supporting that the parameter that more bits of being advised by the present invention indicate can be included in initial parameter negotiation, and those of ordinary skill in the art can apply this method in a different manner.
In example embodiment of the present invention, target side, typically via the 4th bit of control field using UI frame, sends the instruction about whether there is more data frame, to respond the frame from the side's of startuping reception.But the present invention is not limited to above-mentioned example.Such as, although target side is by using UI frame to the transmission of startup side about the instruction that whether there is more data frame, I frame can also be used to send this instruction.And although target side sends in response to the SYMM frame received from startup side the response frame comprising more data bit indicator, it also can comprise more data bit indicator at I or the UI frame sent from startup side.And, although by using the 4th field of control field to indicate whether to there is more data frame, also other redundant bit can be used indicate.Startup side and target side can both send the frame comprising more data bit indicator.
Although illustrate and describe the present invention with reference to example embodiment of the present invention, it will be understood by those skilled in the art that the various changes can carried out in form and details wherein, and do not depart from the spirit and scope of the present invention.
Claims (15)
1. improve a symmetric method in the transfer of data for the logical link control LLC layer of the near-field communication NFC device in equity, comprise the steps:
Receive LLC information frame by a NFC device as startup side, this LLC information frame comprises the more data indicator bit being set to one of ' 0 ' or ' 1 ' by another NFC device as target side;
Checked whether by a described NFC device and be provided with more data indicator bit; And
When the more data indicator bit arranged for ' 1 ' time instruction there is more data frame, sent the idle timer of symmetrical SYMM frame and the SYMM counter expires to be instructed such as not immediately to another NFC device described by a described NFC device.
2. method according to claim 1, also comprises by idle timer startup side and waits for that idle timer expires, and then sends the first symmetrical SYMM frame to target side.
3. method according to claim 1, also comprises and receives by startup side the first response frame wherein more data bit being set to ' 0 ' from target side, and starts idle timer for SYMM frame sends.
4. the method for carrying out communicating between the first near-field communication NFC device performing NFC and the second NFC device, the method comprises:
(a) first NFC device to second NFC device send Frame;
(b) second NFC device arranged by the bit of logic link control LLC information frame and there is or do not exist the instruction of more data, and LLC information frame to be sent as the response frame being used for responding the Frame sent from this first NFC device in (a); And
(c) the first more data bit of response frame that receives of NFC device inspection, and wait for the scheduled time according to check result or send next transmission data bit immediately and do not wait for the scheduled time.
5. method according to claim 4, wherein LLC information frame comprises information I frame and unnumbered information UI frame.
6. method according to claim 4, wherein more data bit comprises the 4th bit of the control field of LLC information frame.
7. method according to claim 5, also comprises: by using the bit of the control field of LLC information frame, identify whether LLC information frame comprises I frame or UI frame.
8. method according to claim 7, wherein said bit comprises the 5th bit and the 6th bit of control field.
9. method according to claim 5, also uses the bit of control field to identify whether LLC information frame comprises the supervisory signals of the mode of operation being used to indicate electrical combination.
10. method according to claim 4, if wherein described bit is set to ' 0 ' in (b), then the first NFC device sends next frame in (c) after the wait scheduled time, if and at (b), described bit is set to ' 1 ', then the first NFC device is not waited for the scheduled time and sends next frame immediately in (c).
11. methods according to claim 4, wherein, the Frame in (a) comprises symmetrical SYMM frame, and the LLC information frame in (b) is in response to the response frame of SYMM frame.
12. methods according to claim 10, wherein, the first NFC device comprises the NFC device as the operation of startup side, and the second NFC device comprises the NFC device as target side operation.
13. methods according to claim 4, wherein sent UI frame comprises: the object Service Access Point dsap field comprising destination address; Comprise the source service access point ssap field of source address; Control field; And data information field.
14. methods according to claim 4, wherein sent I frame comprises: the object Service Access Point dsap field comprising destination address; Comprise the source service access point ssap field of source address; Control field; And data information field.
15. methods according to claim 4, wherein (a), (b) and (c) periodically occur successively.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN897CH2007 | 2007-04-27 | ||
| IN897/CHE/2007 | 2007-04-27 | ||
| KR1020070122893A KR101447747B1 (en) | 2007-04-27 | 2007-11-29 | System and method to improve symmetry in data transfer in llc layer of peer to peer nfc device |
| KR122893/07 | 2007-11-29 |
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| Publication Number | Publication Date |
|---|---|
| CN101304299A CN101304299A (en) | 2008-11-12 |
| CN101304299B true CN101304299B (en) | 2015-05-06 |
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| CN200810127728.5A Expired - Fee Related CN101304299B (en) | 2007-04-27 | 2008-04-28 | Method for improving symmetry in data transmission in logic link control layer |
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| KR (1) | KR101447747B1 (en) |
| CN (1) | CN101304299B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103927501B (en) * | 2013-01-14 | 2017-05-24 | 中兴通讯股份有限公司 | Data pre-processing method and system oriented to NFC terminal network application |
| KR101688356B1 (en) | 2013-01-28 | 2016-12-20 | 후아웨이 디바이스 컴퍼니 리미티드 | Nfc configuration method, nfc data transmission method, controller and nfc controller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035331A1 (en) * | 2004-09-30 | 2006-04-06 | Koninklijke Philips Electronics N.V. | Method and device for fast near-field communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4092692B2 (en) * | 2003-06-06 | 2008-05-28 | ソニー株式会社 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM |
| US7551948B2 (en) * | 2003-07-24 | 2009-06-23 | Cisco Technology, Inc. | Uniform power save method for 802.11e stations |
| US7706399B2 (en) | 2003-12-19 | 2010-04-27 | Intel Corporation | Polling in wireless networks |
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- 2007-11-29 KR KR1020070122893A patent/KR101447747B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035331A1 (en) * | 2004-09-30 | 2006-04-06 | Koninklijke Philips Electronics N.V. | Method and device for fast near-field communication |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101304299A (en) | 2008-11-12 |
| KR20080096349A (en) | 2008-10-30 |
| KR101447747B1 (en) | 2014-10-08 |
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