CN102239643A - Non-secure frame transmission method, device, and system in uwb - Google Patents
Non-secure frame transmission method, device, and system in uwb Download PDFInfo
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- CN102239643A CN102239643A CN200880132201XA CN200880132201A CN102239643A CN 102239643 A CN102239643 A CN 102239643A CN 200880132201X A CN200880132201X A CN 200880132201XA CN 200880132201 A CN200880132201 A CN 200880132201A CN 102239643 A CN102239643 A CN 102239643A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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Abstract
A non-secure frame transmission method, device, and system in Ultra Wideband (UWB) are provided. The non-secure frame transmission method includes obtaining the number of sent non-secure frames (S301); carrying the number of the sent non-secure frames in a non-secure frame (S303); and sending the non-secure frame (S305). A receiving method includes obtaining the number of received non-secure frames (S306); deciding whether the received non-secure frame is a replay frame of formerly received non-secure frames (S307).
Description
The present invention relates to the transmission method of non-security frame, device and system in wireless communication field, more particularly to a kind of UWB for the transmission method of non-security frame, device and system technical field in a kind of UWB.
Background technology
UWB (Ultra Wideband, ultra wide band) technology use more than 1GHz bandwidth, communication speed is up to hundreds of Mbit/S, in short distance high-speed wireless access system, high speed WPAN (Wireless Personal Area Network Communication Technologies, wireless personal local area network mechanics of communication) digital home's video display network, short distance high-speed radio connection application in, have stronger technical advantage and wide application prospect.
Support the WiMedia of MB-OFDM systems to start to cooperate with Ecma International in 2005, and be proposed ECMA-368 standards and ECMA-369 standards, define the PHY and MAC layer and MAC-PHY interfaces of distributed UWB system.In June, 2006, WiMedia alliances submitted ISO to discuss and pass through above-mentioned standard, and ISO issue ISO-IEC -26907 and the standards of ISO-IEC -26908 form actual international professional standard.
Above-mentioned iso standard defines a fully distributed UWB system, and each equipment is independent and equity.The security mechanism that standard is defined includes：Two level of securitys, non-security and strong safety；Three safe modes, to control level of security；4-Way Handshake mechanism, to carry out the foundation and key generation of safe trusting relationship and distribute.The safeguard protection of offer includes data encryption, message integrity and Replay Attack resistance etc..For the various safeguard protections but provided are both for safe frame, any safety measure is not provided then to non-security frame.
Whether safe mode mentioned above, need for instruction equipment or allow to set up security relationship for data communication.ISO issue UWB standard defined in three safe modes be respectively：
Safe mode 0:Security relationship can not be set up with other equipment by working in the equipment of the pattern, must be communicated using non-security frame.
Safe mode 1:Working in the equipment of the pattern can only pacify with equally working in the equipment of the pattern and setting up
Fully closed system.The equipment is communicated using non-security frame with the equipment for working in the equipment of pattern 0 and working in pattern 1 but not setting up security relationship with the equipment；The equipment is according to table 1 using safe frame with working in pattern 1 and being communicated with the equipment that the equipment sets up security relationship.
Safe mode 2:Security relationship can not be set up with working in the equipment of pattern 0 or pattern 1 by working in the equipment of the pattern.The equipment of the pattern is worked in equally working in before the equipment of the pattern communicated, 4-Way Handshake process must be used to set up security relationship, and according to table 1 using safe frame with working in pattern 2 and being communicated with the equipment that the equipment has security relationship.Work in the equipment of the pattern and abandon Lost and require safety but without providing safe frame according to table 1.
It was found from defined analysis above, the equipment which kind of pattern no matter worked in, all or part of communication of the support based on non-security frame.Frame protection under the security relationship of table 1.
So, no matter which kind of pattern is equipment work in, and attack equipment all may form resource occupation and energy expenditure to legal receiving device by resetting the non-security frame of legal transmission equipment.For resource-constrained, the UWB systems of energy-sensitive, meaningless resource occupation and energy expenditure are likely to result in can not using for equipment, and form refusal service.Attack equipment can form the Denial of Service attack to legal receiving device by resetting the non-security frame of legal transmission equipment.The content of the invention
Embodiments of the invention provide a kind of sending method of non-security frame in UWB, including：Obtain the number of the non-security frame sent；
The number of the non-security frame sent described in being carried in non-security frame；
Send the non-security frame.
Embodiments of the invention additionally provide a kind of method of reseptance of non-security frame in UWB, including：Obtain the number of the non-security frame received；
Receive non-security frame；
According to the number of the non-security frame sent carried in the non-security frame received and the number of the non-security frame received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
Another embodiment of the present invention provides a kind of dispensing device of non-security frame in UWB, including：Non-security frame counter, the number for obtaining the non-security frame sent；
Unit is carried, for the number of the non-security frame sent described in the carrying in the non-security frame；Transmitting element, for sending the non-security frame.
Embodiments of the invention additionally provide a kind of reception device of non-security frame in UWB, including：Receiving unit, for receiving non-security frame；
Non-security frame counter, the number for obtaining the non-security frame received；
Judging unit, for the number and the number of the non-security frame received according to the non-security frame sent carried in the non-security frame that receives, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
One more embodiment of the present invention provides a kind of Transmission system of non-security frame in UWB, including：
Dispensing device, the number for obtaining the non-security frame sent, the number of the non-security frame sent in non-security frame described in carrying, and send the non-security frame；
Reception device, for receiving non-security frame, obtain the number of the non-security frame received, and the number of the number according to the non-security frame sent carried in the non-security frame received and the non-security frame received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
The transmission method of non-security frame in UWB provided in an embodiment of the present invention, device and system, sent by being obtained respectively in transmitting terminal and receiving terminal, the number of the non-security frame received, and the number of the non-security frame sent described in being carried in non-security frame, receiving terminal is received after non-security frame, can be according to the number of the non-security frame sent carried in non-security frame and the number of the non-security frame received of acquisition, judge the non-security frame that receives whether be the non-security frame having been received by playback frame, thus the embodiment of the present invention can recognize the Denial of Service attack that attack equipment is initiated, the more high safety mechanism of the connection setup between equipment to work in different safe modes.Brief description of the drawings
Fig. 1 is the flow chart of the sending method of the non-security frame of the embodiment of the present invention；
Fig. 2 is the flow chart of the method for reseptance of the non-security frame of the embodiment of the present invention；
Fig. 3 is the flow chart of the transmission method of the non-security frame of the embodiment of the present invention；
Fig. 4 is the frame head form of the non-security frame of prior art；
Fig. 5 is the frame head form of the non-security frame of embodiment illustrated in fig. 3；
Fig. 6 is the schematic diagram of the dispensing device of the non-security frame of the embodiment of the present invention；
Fig. 7 is the schematic diagram of the reception device of the non-security frame of the embodiment of the present invention；
Fig. 8 is the schematic diagram of the Transmission system of the non-security frame of example of the embodiment of the present invention.Embodiment
The methods, devices and systems of non-security frame transmission in UWB of the embodiment of the present invention are described in detail below in conjunction with the accompanying drawings.
It will be appreciated that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained under the premise of dynamic, belongs to the scope of protection of the invention.
As shown in figure 1, in embodiments of the invention UWB non-security frame sending method, including：
5101st, the number of the non-security frame sent is obtained；
5102nd, the number of the non-security frame sent described in being carried in non-security frame；
5103rd, the non-security frame is sent.The number of frame, and the number of the non-security frame sent described in being carried in non-security frame, finally non-security frame is transmitted, the playback frame that the number for having sent non-security frame carried in non-security frame can send the non-security frame of legal transmission with attack equipment makes a distinction, the playback frame for attacking equipment transmission is avoided to the resource occupation of legal receiving device, the more high safety mechanism of the connection setup between equipment to work in different safe modes.
As shown in Fig. 2 in embodiments of the invention UWB non-security frame method of reseptance, including：
5201st, the number of the non-security frame received is obtained；
5202nd, non-security frame is received；
S203, number and the number of the non-security frame received according to the non-security frame sent carried in the non-security frame that receives, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
The number for the non-security frame from legal transmitting terminal that the method for reseptance of non-security frame has been received by acquisition in embodiments of the invention UWB, and receive non-security frame, the number of the number of the non-security frame sent finally according to the transmitting terminal carried in the non-security frame received and the non-security frame received, the non-security frame that receives described in judging whether be the non-security frame received playback frame, so as to which receiving terminal can be judged the non-security frame received, pick out the playback frame that attack equipment is sent, avoid attacking resource occupation of the playback frame to legal receiving device of equipment transmission, the more high safety mechanism of the connection setup between equipment to work in different safe modes.
As shown in figure 3, the method for non-security frame transmission includes in the preferred embodiment UWB of the present invention：S301, the non-security frame sent by the acquisition of non-security frame counter number and the number of the non-security frame received.Specifically, non-security frame counter is set respectively in transmitting terminal and receiving terminal, sent out
The counter of sending end is used for the number for obtaining the non-security frame sent, and the non-security frame counter of receiving terminal is used for the number for obtaining the non-security frame received.When not starting to send non-security frame, zero setting processing first is carried out to the non-security frame counter of transmitting terminal and receiving terminal respectively.
5302nd, the non-security frame counter sent updated from increment.
For example, in the non-security frame of the first frame of transmission, then the value of non-security frame counter is increased into 1 certainly.If sending the 5th non-security frame of frame, if the original value of non-security frame counter is 4, non-security frame counter is updated to 5 from rising in value.
Certainly the invention is not limited in this, the self refresh of non-security frame counter can also be carried out again after step S303 completions, or can also carry out updating from increment before or after the non-security frame is sent.Thus embodiments of the invention can need to be selected according to embodiment.And non-security frame counter carries out updating from increment in different time, the number carried in non-security frame is also resulted in different.
Further, in order to maintain secrecy, before next step, the data message after being encrypted can also be encrypted in the number of the non-security frame sent of acquisition.
5303rd, the number of the non-security frame sent is carried in non-security frame.Specifically, it can be realized by changing the frame head form of non-security frame.
It is illustrated in figure 4 the frame head form of non-security frame in the prior art, Fig. 5 is then the number for carrying the non-security frame sent in the present embodiment in the frame header fields of non-security frame.Wherein, the Frame Counter fields in frame header fields are the number for being used for carrying the non-security frame sent.
For example, currently transmitted non-security frame is the 5th frame, then it is that to include the number sent of current non-security frame be 5 to carry in non-security frame;Or, currently transmitted non-security frame is the 5th frame, but carries the number 4 in the non-security frame sent before current non-security frame of current non-security frame, specifically, can be adjusted according to actual needs.
Certainly the invention is not limited in this, the number of the non-security frame sent can also be carried in the other positions of data frame.
Further, in order to maintain secrecy, entrained also can be the data message obtained after the non-security frame sent is encrypted.
5304th, the non-security frame to be sent is built using new control frame or command frame.
Specifically, new frame head, former frame and check code can be used to build the non-security frame to be sent, content frame can be control message or command messages.It is in order that the non-security frame sent being capable of receiving end compatible receiver using new control frame or command frame.The receiving device for the non-security frame that compatible can be built in this way, can decoding process corresponding with the building mode non-security frame decode to obtain content frame, and obtain the information of number carried in frame header fields.
5305th, above-mentioned non-security frame is sent.
5306th, the non-security frame that receiving step S305 is sent.The number for the non-security frame that transmitting terminal has been sent is carried in the non-security frame received, as shown in figure 5, carry the number of non-security frame in frame header fields Frame Counter.Certainly the invention is not limited in this, the number of the non-security frame sent can also be carried in the other positions of data frame.
5307th, the number of the non-security frame received obtained according to the non-security frame counter of the information of number of the non-security frame sent carried in the non-security frame that receives and receiving terminal, judge received non-security frame whether be the non-security frame having been received by playback frame.Specifically, if the number of the non-security frame sent carried in the non-security frame received is less than or equal to the number of the non-security frame received, it is playback frame that can determine the non-security frame received.
For example, when receiving the non-security frame of the 5th frame, the non-security frame number that the non-security frame counter received of receiving terminal is obtained is 4, and it is 5 to carry the number in non-security frame, may thereby determine that received non-security frame is the 5th non-security frame of frame transmitted by legal transmission equipment.If it is 5 to carry the number in non-security frame certainly, and the non-security frame number that the non-security frame counter of receiving terminal is obtained is the value less than or equal to 4, and it is not playback frame that can illustrate the frame yet.Similarly, receiving terminal receives non-security frame under any circumstance, such judgement is all carried out, so that it is determined that whether the non-security frame received is playback frame.Certainly, due to may also network error cause, thus playback frame may also come from legal transmission equipment, at that time can be judged according to specific agreement.
If when receiving the non-security frame of a certain frame, it is 5 to carry the number in non-security frame, and the number received that the non-security frame counter of receiving terminal is obtained is the number more than 5, then can be determined that received non-security frame is playback frame.
5308th, just the blunt result # texts judged according to step S307 are correspondingly handled.If the non-security frame received is not playback frame, the non-security frame counter of receiving terminal is according to carrying in the non-security frame received
Number is updated.Specifically, non-security frame of the 5th frame from legal transmitting terminal is for example received in step S307, then the number increment remembered the non-security frame counter of receiving terminal is 5.If the non-security frame received is playback frame, due to being also likely to be that the frame that causes of network error is reset, other processing should be then carried out according to actual conditions, Li such as Lost abandon the playback frame or it is determined that playback frame is from the connection illegally sent in the case of equipment between disconnection and illegal transmitting terminal.
The transmission method of the non-security frame of the present embodiment, receiving terminal is judged the non-security frame of information of number receiving, carrying the non-security frame sent, it is determined that the non-security frame received is playback frame or the non-security frame sent from legal transmission equipment, so as to resist illegal playback frame according to judged result, the Replay Attack from attack equipment is defendd.
As shown in fig. 6, another embodiment of the present invention provides a kind of dispensing device of non-security frame in UWB, including：
Non-security frame counter 601, the number for obtaining the non-security frame sent；
Unit 602 is carried, for the number η of the non-security frame sent described in the carrying in the non-security frame,
Transmitting element 603, for sending the non-security frame.
In the preferred embodiment, the dispensing device of non-security frame also includes ciphering unit, and the number for the non-security frame sent for acquisition is encrypted, so that the data message obtained after encryption is carried in non-security frame.Certainly, as needed, the number also to the non-security frame carries out other data processings, to obtain the information of number of non-security frame, and is then provided with reduction apparatus accordingly in receiving terminal, the information of number of the non-security frame is reduced into specific value.The dispensing device of non-security frame is provided with the number that non-security frame counter obtains the non-security frame sent in embodiments of the invention UWB, carry unit can be carried in the non-security frame described in the number of non-security frame that has sent, so as to notify the information of the corresponding non-security frame of receiving terminal when non-security frame is sent, thus receiving terminal can know which non-security frame is playback frame according to the information, whether legal transmission equipment is come from, so as to avoid the Denial of Service attack for attacking equipment, the more high safety mechanism of the connection setup between equipment to work in different safe modes.
As shown in fig. 7, embodiments of the invention additionally provide a kind of reception device of non-security frame in UWB,
Including：
Receiving unit 701, for receiving non-security frame；
Non-security frame counter 702, the number for obtaining the non-security frame received；
Judging unit 703, for the number and the number of the non-security frame received according to the non-security frame sent carried in the non-security frame that receives, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
Wherein, when judging unit 703 is when the non-security frame for judging to receive is not playback frame, then non-security frame counter 702 can update the number of the non-security frame received according to the number of the non-security frame sent carried in the non-security frame received.And in judging unit 703 in the non-security frame for judging to receive as playback frame when, then the number that non-security frame counter 702 is obtained is without updating.
In the preferred embodiment of the present invention, the reception device of non-security frame also includes decryption unit in UWB, the data message that the number of non-security frame for the basis carried in the non-security frame received have been sent is obtained after being encrypted is decrypted, so as to obtain the number for the non-security frame that transmitting terminal has been sent.
Receiving unit in embodiments of the invention UWB in the reception device of non-security frame receives non-security frame, non-security frame counter can obtain the number for the non-security frame that receiving unit has been received, and the number for the non-security frame that judging unit has been received according to the number and the receiving unit of the non-security frame sent carried in the non-security frame received, judge to obtain the non-security frame received whether be the non-security frame received playback frame, and determine whether to update the number of the acquisition of the non-security frame counter of the receiving terminal according to this, so as to which receiving terminal can interpolate that out the non-security frame sent from legal transmission equipment, and set up security mechanism in the communication equipment of different stage.
As shown in figure 8, one more embodiment of the present invention provides a kind of Transmission system of non-security frame in UWB, including：
Dispensing device 801, the number for obtaining the non-security frame sent, the number of the non-security frame sent in non-security frame described in carrying, and send the non-security frame；
Reception device 802, for receiving non-security frame, obtain the number of the non-security frame received, and the number according to the non-security frame sent carried in the non-security frame received and the number of non-security frame that has received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.
When it is not the playback frame of the non-security frame received that reception device 802, which judges the non-security frame received, then the number of the non-security frame received obtained is updated according to the number of the non-security frame sent carried in the non-security frame received.If the non-security frame that receives is the playback frame of the non-security frame received, the number to the non-security frame received of acquisition is not updated.
The Transmission system of non-security frame provided in an embodiment of the present invention, the number of the non-security frame sent is obtained by transmitting terminal, and the number of the non-security frame sent described in being carried in non-security frame, receiving terminal is received after the non-security frame of transmitting terminal transmission, can be according to the number and the number of the non-security frame received of the non-security frame sent carried in non-security frame, the non-security frame that receives described in judging whether be the non-security frame received playback frame, whether legal transmitting terminal is come from, and determine whether to update the number for the non-security frame received that receiving terminal is obtained according to this, thus the present invention can recognize the Denial of Service attack that attack equipment is sent, and set up security mechanism in the communication equipment of different stage.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, computer program is can be by instruct the hardware of correlation to complete, described program can be stored in a computer read/write memory medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic disc, CD, read-only memory（Read-Only Memory, ROM) or deposit oneself at random and recall body (Random Access Memory, RAM) etc..It is described above; only embodiment of the invention, but protection scope of the present invention is not limited thereto, any one skilled in the art the invention discloses technical scope in; the change or replacement that can be readily occurred in, should all be included within the scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (1)
- Claims1st, in a kind of UWB non-security frame sending method, it is characterised in that including：Obtain the information of number of the non-security frame sent；The information of number of the non-security frame sent described in being carried in non-security frame；Send the non-security frame.2nd, in UWB according to claim 1 non-security frame sending method, it is characterised in that the information of number for the non-security frame that the acquisition has been sent includes：Set up the non-security frame counter that has sent and pass through the non-security frame counter obtain described in the information of number of non-security frame that has sent.3rd, in UWB according to claim 1 non-security frame sending method, it is characterised in that also include：Before or after the information of number of the non-security frame sent described in being carried in non-security frame, the number of the non-security frame to having sent updated from increment.4th, in the UWB according to any one of claims 1 to 3 non-security frame sending method, it is characterised in that also include：The information of number of the non-security frame sent of acquisition is encrypted；The data message obtained after encryption of the information of number of the non-security frame sent described in being carried in non-security frame.5th, in a kind of UWB non-security frame method of reseptance, it is characterised in that including：Obtain the number of the non-security frame received；Receive non-security frame；According to the information of number of the non-security frame sent carried in the non-security frame received and the number of the non-security frame received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.6th, in UWB according to claim 5 non-security frame method of reseptance, it is characterised in that the non-security frame that receives described in judging whether be the non-security frame received playback frame, including：According to the information of number of the non-security frame sent carried in the non-security frame received, received To non-security frame in the number of the non-security frame sent that carries；If the number of the non-security frame sent carried in the non-security frame received is less than or equal to the number of non-security frame received, the non-security frame that receives is the playback frame of the non-security frame received.7th, in UWB according to claim 5 non-security frame method of reseptance, it is characterised in that the number for the non-security frame that the acquisition has been received includes：Set up the non-security frame counter received and the number of the non-security frame received is obtained by the non-security frame counter.8th, in the UWB according to claim 5 non-security frame method of reseptance, it is characterised in that also include：If the non-security frame received is not the playback frame of the non-security frame received, the information of number of the non-security frame received described in the information of number renewal of the non-security frame sent carried in the non-security frame received according to.9th, in the UWB according to any one of claim 5 to 8 non-security frame method of reseptance, it is characterized in that, if the information of number of the non-security frame sent carried in the non-security frame received is the data message by encryption, the method for reseptance also includes：The information of number for carrying the non-security frame sent in the non-security frame received is decrypted.10th, in a kind of UWB non-security frame dispensing device, it is characterised in that including：Non-security frame counter, the number for obtaining the non-security frame sent；Unit is carried, for the information of number of the non-security frame sent described in the carrying in the non-security frame；Transmitting element, for sending the non-security frame.11st, dispensing device as described in claim 10, it is characterised in that including：The non-security frame counter carried in non-security frame described in before or after the number of non-security frame that has sent, the information of number of the non-security frame to having sent updated from increment.12nd, in a kind of UWB non-security frame reception device, it is characterised in that including：Receiving unit, for receiving non-security frame；Non-security frame counter, the number for obtaining the non-security frame received；Judging unit, for the number according to the non-security frame sent carried in the non-security frame received The number of information and the non-security frame received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.13rd, the reception device of non-security frame as described in claim 12, it is characterized in that, the judging unit obtains the number of the non-security frame sent carried in the non-security frame received always according to the information of number of the non-security frame sent carried in the non-security frame received, if the number of the non-security frame sent carried in the non-security frame received is less than or equal to the number of non-security frame received, the non-security frame that receives is the playback frame of the non-security frame received.14th, in a kind of UWB non-security frame Transmission system, it is characterised in that including：Dispensing device, the information of number for obtaining the non-security frame sent, the information of number of the non-security frame sent in non-security frame described in carrying, and send the non-security frame；Reception device, for receiving non-security frame, obtain the number of the non-security frame received, and the information of number according to the non-security frame sent carried in the non-security frame received and the number of non-security frame that has received, judge described in the non-security frame that receives whether be the non-security frame received playback frame.15th, in UWB as described in claim 14 non-security frame Transmission system, it is characterized in that, the information of number of the non-security frame sent carried in the non-security frame that the reception device is received according to obtains the number of the non-security frame sent carried in the non-security frame receivedIf the number of the non-security frame sent carried in the non-security frame received is less than or equal to the number of non-security frame received, the non-security frame that receives is the playback frame of the non-security frame received.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2008/073377 WO2010066073A1 (en) | 2008-12-08 | 2008-12-08 | Non-secure frame transmission method, device, and system in uwb |
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| Publication Number | Publication Date |
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| CN102239643A true CN102239643A (en) | 2011-11-09 |
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| CN200880132201XA Pending CN102239643A (en) | 2008-12-08 | 2008-12-08 | Non-secure frame transmission method, device, and system in uwb |
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| WO (1) | WO2010066073A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060062188A1 (en) * | 2004-09-20 | 2006-03-23 | Kaisa Nyberg | Replay prevention in wireless communications networks |
| CN101160825A (en) * | 2005-02-01 | 2008-04-09 | 香港应用科技研究院有限公司 | System and method for efficient traffic processing |
-
2008
- 2008-12-08 WO PCT/CN2008/073377 patent/WO2010066073A1/en active Application Filing
- 2008-12-08 CN CN200880132201XA patent/CN102239643A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060062188A1 (en) * | 2004-09-20 | 2006-03-23 | Kaisa Nyberg | Replay prevention in wireless communications networks |
| CN101160825A (en) * | 2005-02-01 | 2008-04-09 | 香港应用科技研究院有限公司 | System and method for efficient traffic processing |
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| Publication number | Publication date |
|---|---|
| WO2010066073A1 (en) | 2010-06-17 |
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Application publication date: 20111109 |