EP1941683A2 - Procede, programme et systeme de transfert de donnees entre une pluralite de terminaux qui communiquent via un canal de communication commun dans un reseau sans fil, et terminal sans fil - Google Patents
Procede, programme et systeme de transfert de donnees entre une pluralite de terminaux qui communiquent via un canal de communication commun dans un reseau sans fil, et terminal sans filInfo
- Publication number
- EP1941683A2 EP1941683A2 EP06831283A EP06831283A EP1941683A2 EP 1941683 A2 EP1941683 A2 EP 1941683A2 EP 06831283 A EP06831283 A EP 06831283A EP 06831283 A EP06831283 A EP 06831283A EP 1941683 A2 EP1941683 A2 EP 1941683A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- data
- signal
- sending
- request
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Definitions
- the present invention relates to a method, a program and a system for transferring data between a plurality of terminals that communicate via a common communication channel in a wireless network, and a wireless terminal.
- each terminal can receive data from any other terminal of the network. Note that each terminal is able to transmit data to a coverage area of its own and that each other terminal in this coverage area is likely to receive the transmitted data, even if this other terminal is not the recipient of these data.
- a terminal may be in coverage areas of several other terminals, and can therefore simultaneously receive data transmitted by at least two other terminals.
- each terminal in the coverage area of another terminal being transmitted must not transmit data while the channel is busy. This avoids collisions with the data transmitted by the other terminal being transmitted.
- CSMA / CA Carrier Sense Multiple Access Protocol with Collision Avoidance
- This method comprises in particular an acknowledgment step during which a receiving terminal acknowledges the good reception of the data by sending an acknowledgment signal.
- a transmitting terminal does not receive an acknowledgment signal after sending data to a receiving terminal, it is because there has been a collision and this data has not been received correctly. In this case, the transmitting terminal transmits the data again, usually after a random time.
- This collision detection method does not, however, prevent these collisions in a systematic manner.
- Also known in the state of the art is a method for transferring data between a plurality of terminals that communicate via a common communication channel in a wireless network, each terminal being able to cover a coverage area, the method comprising:
- RTS / CTS Request To Send / Clear To Send
- FIG. 1 shows a system for transferring data between wireless terminals according to such a method of the state of the art.
- each terminal T1, T2, T2 ', T3, T3', T4, T4 ', T is in the coverage area of the two terminals which are adjacent thereto.
- the data transfer takes place from the first terminal T1 to the second terminal T2.
- a terminal T3 located in the coverage area of the second terminal T2 should not transmit data, in order to avoid collisions with the data received by this second terminal T2.
- the terminal T3 will not have to send an availability signal if another terminal T4 sends this terminal T3 a request signal for sending data.
- no other terminal will be able to send data to the terminal T3 during the transfer of data from the first terminal T1 to the second terminal T2, since no terminal will be able to receive an availability signal from this terminal T3.
- a disadvantage of this state of the art is that none of the terminals T3 in the coverage area of the second terminal T2 can receive data during data transfer between the first T1 and the second terminal T2.
- the invention aims in particular to overcome this drawback by providing a data transfer method reducing the blocking of certain terminals of the coverage area of the second terminal.
- the subject of the invention is a method for transferring data of the aforementioned type, characterized in that the method further comprises a step of sending a a request signal for receiving data from a third terminal having received the availability signal and not having received the send request signal, intended to warn that the third terminal is available to receive data.
- a third terminal located in the coverage area of the second terminal, but not in the coverage area of the first terminal, is able to warn the terminals of its coverage area, upon receipt of the availability signal broadcast by the second terminal, that it can receive data.
- this other terminal can do it without the need to send a request signal to send data, or require to receive an availability signal, since it will already have received a signal that the third terminal can receive data.
- the third terminal sends an availability signal during the transfer of data from the first terminal to the second terminal.
- the third terminal is no longer fully blocked since it can freely receive data from another terminal.
- the third terminal may be any terminal in the coverage area of the second terminal and not in the coverage area of the first terminal. Since the system can include many such terminals, the invention has the advantage of allowing all these terminals to be able to receive data during the transfer of data from the first terminal to the second terminal.
- a data transfer method may further include one or more of the following features.
- the data transfer method comprises, after the step of sending the data sending request signal and before a data transfer step, a waiting step for a predefined duration sufficient for the steps of sending of the signal of availability and sending of the data reception request signal are completed before the step of transferring the data.
- the first terminal transmits the data only when all the signals of availability and request for receiving data have been sent, in order to avoid possible collisions of the data transmitted with these signals.
- At least one of the data sending request signal and the data reception request signal comprises an identifier of the terminal transmitting this signal.
- the terminals receiving this signal know the identifier of the terminal requesting to send or receive data.
- At least one of the data request request signal and the availability signal comprises an identifier of the destination terminal of this signal.
- the terminals receiving this signal can know if this signal is intended for them or not.
- At least one of the data request request signal, the availability signal and the data reception request signal includes information concerning the duration of the data transfer between the first and second terminals. With this information, the terminals receiving the signal know the data transfer time and can, if necessary, be configured not to emit signals during this transfer time to avoid collisions.
- At least one terminal is associated with a temporal parameter, decrementing over time, the terminal can not emit any signal until this parameter is non-zero.
- this parameter allows the blocking of the terminal, for example during the duration of the data transfer between the first and second terminals.
- a terminal When a terminal receives a data request request signal or an availability signal of which it is not the recipient, its time parameter is incremented by a value corresponding to the information concerning the duration of the data transfer. , so as to be non-zero until the data is transmitted in their entirety from the first terminal to the second terminal.
- the first terminal sends the request signal for sending data only if the data to be transferred have a size greater than a predetermined threshold, for example greater than 500 bytes.
- a predetermined threshold for example greater than 500 bytes.
- the invention also relates to a data transfer program for wireless, comprising software instructions for:
- the program also comprises a software instruction. for: - when the wireless terminal has received an availability signal and has not received a send request signal, send a data request request signal to warn that the terminal is available to receive data. data.
- the invention further relates to a wireless terminal capable of communicating with other wireless terminals via a common communication channel in a wireless network, characterized in that it is provided with a data transfer program such that previously defined.
- the invention finally relates to a system for transferring data between wireless terminals communicating via a common communication channel in a wireless network, characterized in that it comprises at least one wireless terminal as defined above.
- FIG. 1 represents a system for transferring data between wireless terminals according to a method of the state of the art as described above.
- FIG. 2 represents a system for transferring data between wireless terminals according to an exemplary embodiment of the invention
- FIG. 3 represents steps of a method of transferring data between wireless terminals of the system of FIG. 2;
- FIG. 4 diagrammatically represents the content of request signals for sending data, availability and request for receiving data exchanged between the wireless terminals of the system of FIG. 2;
- FIG. 5 diagrammatically represents information contained respectively by the data sending request, the availability and the data receiving request signals, concerning time periods between the sending of these respective signals and the end of the transfer. of data ;
- FIG. 6 diagrammatically represents the activities of the terminals of FIG. 2 during the implementation of the method of FIG. 3.
- FIG. 2 shows a wireless network 10 comprising a plurality of wireless terminals T, T 1 , T 2 , T 3 , T 3 ', T 4 , T 4 ', Ti and T j which communicate together via a wireless network.
- the communication channel is a radio channel.
- two terminals are said to transmit on the same channel when they use the same transmission frequency.
- Each wireless terminal T, T 1 , T 2 , T 3 , T 3 ', T 4 , T 4 ', T 1 and T j is, depending on the case, a mobile terminal or an access point, for example a terminal fixed.
- the wireless network 10 comprises a first terminal T 1 , provided with data to be sent to a second terminal T 2 located in a first coverage area Z 1 covered by the first terminal T 1 .
- terminals T 1 and T j are also in the first coverage area Z 1 .
- the second terminal T 2 covers a second coverage area Z 2 , in which there are third terminals T 3 , T 3 'of the wireless network 10. Note that the terminal T j is also in the second coverage area Z 2 .
- the third terminals T 3 , T 3 ' also cover respective coverage areas in which there are other terminals respectively labeled T 4 and T 4 '.
- Each wireless terminal of the network 10 is provided with a data transfer program.
- This data transfer program includes a software instruction for sending a request signal for sending RTS data when the wireless terminal plans to send data to another terminal.
- This RTS data sending request signal is intended to warn this other terminal that the wireless terminal plans to send data to it.
- the data transfer program also comprises a software instruction for sending a CTS availability signal when the wireless terminal receives an RTS data sending request signal intended for it and this wireless terminal is available to receive the data. that is, it is not in the process of transmitting or receiving other data.
- the availability signal CTS is intended to warn another terminal having sent the request signal sending RTS data to the wireless terminal that this wireless terminal is available to receive the data.
- the data transfer program further comprises a software instruction for sending a RTR data reception request signal when the wireless terminal has received a CTS availability signal and has not received a request signal. RTS sending. This RTR data reception request signal is intended to warn other terminals that the wireless terminal is available to receive data.
- the data transfer program finally comprises a software instruction for sending an acknowledgment signal ACK when the wireless terminal has received data transmitted in their entirety.
- This acknowledgment signal ACK is intended to warn another terminal that has sent data to the wireless terminal that these data have been received in their entirety.
- each terminal is associated with a temporal parameter, decrementing over time, corresponding to a period during which this terminal must not emit a signal.
- each terminal is configured not to emit a signal until the time parameter associated with it is non-zero.
- each wireless terminal is configured to be blocked for a short time interval, generally noted SIFS (Short InterFrame Space), after each sending or receiving a signal.
- SIFS Short InterFrame Space
- This short time interval represents a margin of safety intended to ensure that there will be no collision between two signals transmitted or received in succession.
- FIG. 3 shows a method for transferring data between the terminals of the network 10.
- FIG. 6 represents the activities of the terminals T1, T2, T3 and T4 during the implementation of this method.
- the first terminal T 1 initializes the data transfer D1 to the second terminal T 2 , being in its coverage area Z 1 .
- the size of the data to be sent is checked. If the size of these data is less than a predetermined threshold, for example 500 bytes, it is considered that it is not useful to use the data transfer method according to the invention and the data is then sent using only a conventional CSMA / CA collision detection method. If the size of the data is greater than the predetermined threshold, it proceeds to a step 22 of sending a data sending request signal RTS, from the first terminal T 1 to the second terminal T 2 .
- a predetermined threshold for example 500 bytes
- This RTS data sending request signal is intended to warn the second terminal T 2 that the first terminal T 1 requests to transfer data D1 to it. It will be noted that the first terminal T 1 sends this signal RTS over all the first zone Z 1 that it covers. Thus, all the terminals T 2 , T 1 , T j being in the first coverage area Z 1 also receive the request signal for sending RTS data.
- each terminal T 2 , J 1 , J 1 of the first coverage area Z 1 can know which are the transmitters and recipients of the request signal for sending data RTS, this signal carries information I 1 identifying the transmitting terminal signal and information I 2 identifying the destination terminal of this signal (see Figure 3).
- This information I 1 and I 2 generally comprise MAC (Medium Access Control) addresses of the transmitter and receiver terminals respectively.
- any terminal J 1 , J 1 receiving the request signal for sending RTS data without being the recipient blocks during the total duration of the data transfer, so as not to risk sending signals that can collide with the signals emitted by the first terminal T 1 .
- the RTS data sending request signal carries information I 3 concerning the total planned duration until the data D1 is transmitted. in their entirety from the first terminal T 1 to the second terminal T 2 .
- This total duration represented in FIG. 5, comprises:
- the RTS data sending request signal comprises control information I 4 and I 5 , sent respectively at the beginning and at the end of this RTS data sending request signal, making it possible to control that this signal has been received in its entirety.
- This predefined duration A1 therefore comprises:
- the terminal T 1 will be able to send the data D1 to the terminal T 2 only when this waiting time is over, in order to avoid any collisions of the data with a CTS availability signal sent by the second terminal T 2 or a request signal from receiving RTR data received by this second terminal T 2 .
- the second terminal T 2 If the second terminal T 2 is available to receive the data D1, that is to say that it is not in the process of sending or receiving other data, then it goes to a step 24 during of which the second terminal T 2 sends a CTS availability signal to the first terminal T 1 .
- This availability signal CTS is intended to warn the first terminal T 1 that the second terminal T 2 is available to receive the data D1.
- This availability signal CTS is also received by the third terminals T 3 , T 3 'and the terminal T j being in the coverage area Z 2 of the second terminal T 2 .
- the terminals T 3 , T 3 ', T j know that a terminal in their coverage area will receive data and therefore they must not send signals that can collide with the data received by this terminal.
- the availability signal CTS includes information I 6 concerning the time remaining before the data transfer is completed.
- This information I 6 makes it possible to update the time parameters associated with the terminals T 3 , T 3 'so that these terminals can not send data until the data are transmitted in their entirety from the first terminal T 1 to the terminal.
- second terminal T 2 that is to say for a predefined duration, represented in FIG. 5, comprising: the duration of a first short period of time SIFS,
- the availability signal CTS includes information I 7 concerning the destination terminal of this signal, that is to say the first terminal T 1 .
- This information I 7 makes it possible to warn the first terminal T 1 that this availability signal CTS is intended for it, and therefore that the second terminal T 2 is available to receive the data D1 that it wishes to transmit to it and not not the data that another terminal would like to transmit to it.
- the availability signal CTS comprises control information I 8 and Ig, sent respectively at the beginning and at the end of this availability signal CTS, making it possible to verify that this signal has been received in its entirety.
- the second terminal T 2 if the second terminal T 2 is not available to receive the data, it goes to a step 25 end of the process. Indeed, the second terminal T 2 does not send an availability signal CTS, and the first terminal T 1 will not send him the data D1. In this case, the terminal T 1 will generally be put on hold for a random time before trying again to send the data.
- the third terminals T 3 , T 3 ' receive the availability signal CTS of the second terminal T 2 , proceed to a step 26 during which each third terminal T 3 , T 3 ' has not received the send request signal RTS sends, in its coverage area, a request signal for receiving RTR data.
- the RTR data reception request signal is intended to warn other terminals T 4 , respectively T 4 ', located in the coverage area of the third terminal T 3 , respectively T 3 ', because this third terminal T 3 , respectively T 3 ', is available to receive D2 data.
- the terminal T j which receives the availability signal CTS of the second terminal T 2 , but which has also received the send request signal RTS of the first terminal T 1 , does not send a reception request signal.
- RTR data since it is in the coverage area Z 1 , in which the communication channel is occupied by the transfer of data from the first terminal T 1 to the second terminal T 2 , it will not be able to receive data during this period. data transfer. Thanks to the RTR data reception request signal, it is not necessary for another terminal T 4 , respectively T 4 ', to send a request signal for sending RTS data or to receive an availability signal.
- each data reception request signal RTR carries information I 10 concerning the terminal identification transmitter of this signal, i.e. the third terminal T 3, T 3 respectively.
- the other terminals T 4 , respectively T 4 ' are informed of the identity of the terminal T 3 , respectively T 3 ', which is able to receive data D2.
- the RTR data reception request signal comprises information 11 relating to the time remaining until the data D1 is transmitted integrally between the first terminal T 1 and the second terminal T 2 .
- the terminal T 4 , T 4 ' can send data D 2 to the corresponding terminal T 3 , T 3 ' only for a predefined duration, represented in FIG. 5, comprising: the duration of a first short period of time SIFS ,
- the RTR data reception request signal comprises information I 12 and I 13 respectively sent at the beginning and at the end of this RTR data reception request signal, intended to verify that this signal has been received in the receiver. its entirety.
- a step 30 is taken, during which the second terminal T 2 sends an acknowledgment signal ACK to the first terminal T 1 in order to confirm the good reception of the data D1. It will be noted that the transfer of the data D2 from the terminal T 4 , T 4 'to the terminal
- each third terminal T 3 , T 3 ' also sends an acknowledgment signal ACK to the corresponding terminal T 4 , T 4 ' in order to confirm the good reception of the data D 2. It is generally after this step 30 that the terminals Tj, T j blocked can emit again, their time parameter having decremented during the transmission of data until it became zero.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0510843A FR2892539A1 (fr) | 2005-10-24 | 2005-10-24 | Procede, programme et systeme de transfert de donnees entre une pluralite de terminaux qui communiquent via un canal de communication commun dans un reseau sans fil, et terminal sans fil |
PCT/FR2006/051088 WO2007048968A2 (fr) | 2005-10-24 | 2006-10-23 | Procede, programme et systeme de transfert de donnees entre une pluralite de terminaux qui communiquent via un canal de communication commun dans un reseau sans fil, et terminal sans fil |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1941683A2 true EP1941683A2 (fr) | 2008-07-09 |
Family
ID=36579403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06831283A Withdrawn EP1941683A2 (fr) | 2005-10-24 | 2006-10-23 | Procede, programme et systeme de transfert de donnees entre une pluralite de terminaux qui communiquent via un canal de communication commun dans un reseau sans fil, et terminal sans fil |
Country Status (4)
Country | Link |
---|---|
US (1) | US8203945B2 (fr) |
EP (1) | EP1941683A2 (fr) |
FR (1) | FR2892539A1 (fr) |
WO (1) | WO2007048968A2 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009050628A1 (fr) * | 2007-10-19 | 2009-04-23 | Koninklijke Philips Electronics N.V. | Transmission en parallèle pour une meilleure efficacité de réutilisation spatiale |
US8017303B2 (en) * | 2009-02-23 | 2011-09-13 | International Business Machines Corporation | Ultra low post exposure bake photoresist materials |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE172347T1 (de) * | 1991-02-25 | 1998-10-15 | Motorola Inc | Gegenstandsortungssystem |
WO2002015485A1 (fr) * | 2000-08-11 | 2002-02-21 | The Regents Of The University Of California | Acces multiple initialise par recepteur, pour reseaux ad hoc |
JP4339313B2 (ja) * | 2003-05-15 | 2009-10-07 | 三菱電機株式会社 | 通信方法、無線端末および基地局 |
US7397785B2 (en) * | 2003-05-28 | 2008-07-08 | Nokia Corporation | Method for enhancing fairness and performance in a multihop ad hoc network and corresponding system |
CN1567869B (zh) * | 2003-06-30 | 2010-05-05 | 叶启祥 | 可避免干扰损坏并增加空间再用率的干扰控制方法 |
JP2006050519A (ja) * | 2003-10-24 | 2006-02-16 | Sony Corp | 無線通信システム、無線通信装置及び無線通信方法、並びにコンピュータ・プログラム |
KR100574041B1 (ko) * | 2003-10-27 | 2006-04-26 | 삼성전자주식회사 | 애드호크 네트워크 무선통신 시스템 및 그 무선통신방법 |
US20060268760A1 (en) * | 2005-05-17 | 2006-11-30 | University Of Florida Research Foundation, Inc. | Medium access control in wireless local area networks with multi-beam access point |
-
2005
- 2005-10-24 FR FR0510843A patent/FR2892539A1/fr active Pending
-
2006
- 2006-10-23 WO PCT/FR2006/051088 patent/WO2007048968A2/fr active Application Filing
- 2006-10-23 EP EP06831283A patent/EP1941683A2/fr not_active Withdrawn
- 2006-10-23 US US12/083,230 patent/US8203945B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2007048968A2 * |
Also Published As
Publication number | Publication date |
---|---|
US8203945B2 (en) | 2012-06-19 |
FR2892539A1 (fr) | 2007-04-27 |
WO2007048968A3 (fr) | 2007-06-14 |
WO2007048968A2 (fr) | 2007-05-03 |
US20090135719A1 (en) | 2009-05-28 |
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