CN108738125B - Method, device, access point and station for wireless local area network time synchronization - Google Patents
Method, device, access point and station for wireless local area network time synchronization Download PDFInfo
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- CN108738125B CN108738125B CN201710266665.0A CN201710266665A CN108738125B CN 108738125 B CN108738125 B CN 108738125B CN 201710266665 A CN201710266665 A CN 201710266665A CN 108738125 B CN108738125 B CN 108738125B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The invention provides a method, a device, an access point and a station for wireless local area network time synchronization, wherein the method for the wireless local area network time synchronization suitable for the access point side comprises the following steps: sequentially generating a first beacon frame and a second beacon frame; transmitting the first beacon frame and the second beacon frame to a station, wherein the first beacon frame includes a wake-up information element, the second beacon frame includes a time synchronization function parameter, the wake-up information element is used for indicating whether the station wakes up a main communication interface of the station or not, so as to receive the second beacon frame through the main communication interface when the main communication interface is woken up, and the time synchronization function parameter is used for synchronizing the time of the access point and the station. By the technical scheme of the invention, the time synchronization of the access point and the station in dormancy can be ensured.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, an access point, and a station for time synchronization in a wireless local area network.
Background
In 2016, 7 months, 802.11 has established a research group WUR (Wake Up Receiver) of the next generation Wi-Fi (Wireless-Fidelity) technology, namely IEEE (Institute of Electrical and Electronics Engineers) 802.11ba, which is mainly applied to the internet of things and solves the problem of saving station power consumption to the maximum extent possible. The WUR Beacon frame format is proposed in the standard formulation process and functions to keep the station and the access point connected while the primary communication interface and the secondary communication interface of the station are dormant.
Because the MAC (Media Access Control, or Media Access Control) frame part of the WUR Beacon frame adopts an OOK (On-Off Keying) modulation method, which means that the transmission rate is extremely low, if the WUR Beacon frame is designed to be too long, the WUR Beacon frame will occupy a long spectrum time, which is not favorable for saving power of a station (according to the vision of ieee802.11ba, the power consumption for receiving the WUR Beacon frame should be less than 1mW), and is also not favorable for effectively utilizing the spectrum, therefore, the length of the WUR Beacon frame must be strictly limited, a station in sleep may have a time deviation with an Access point, which may cause the station to be out of synchronization with the Access point in time, a chaotic condition occurs during data interaction, and is not favorable for effectively utilizing power saving equipment and the spectrum.
Therefore, how to ensure the time synchronization between the sleeping station and the access point becomes an urgent technical problem to be solved.
Disclosure of Invention
Based on the above problems, the present invention provides a new technical solution, which can solve the technical problem of time deviation between the station and the access point in the sleep mode.
In view of this, a first aspect of the present invention provides a method for time synchronization of a wireless local area network, which is applied to an access point side, and the method for time synchronization of a wireless local area network includes: sequentially generating a first beacon frame and a second beacon frame; transmitting the first beacon frame and the second beacon frame to a station, wherein the first beacon frame includes a wake-up information element, the second beacon frame includes a time synchronization function parameter, the wake-up information element is used for indicating whether the station wakes up a main communication interface of the station or not, so as to receive the second beacon frame through the main communication interface when the main communication interface is woken up, and the time synchronization function parameter is used for synchronizing the time of the access point and the station.
In the technical scheme, a first Beacon frame (i.e., a WUR Beacon frame) and a second Beacon frame (i.e., a normal Beacon frame) are sent to a station, and because the first Beacon frame carries a wakeup information element, the wakeup information element can indicate whether the station wakes up a main communication interface of the station, and therefore, when the main communication interface of the station is woken up, the second Beacon frame can be received through the main communication interface. And the second beacon frame carries a Time Synchronization Function (TSF) parameter, which can ensure the Time Synchronization between the access point and the station in sleep, so as to meet the requirement of ieee802.11ba and achieve the purpose of saving station power consumption.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", where a bit position corresponding to the association identifier ID of the wake-up information element is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID of the wake-up information element is "0" to not wake up the main communication interface.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries time synchronization function parameters, so that the time synchronization of the access point and the station in dormancy is realized.
In any of the above technical solutions, preferably, the first beacon frame and the second beacon frame are broadcast message frames, where a transmission bandwidth of the first beacon frame is smaller than a transmission bandwidth of the second beacon frame.
In the technical scheme, the first beacon frame and the second beacon frame are broadcast message frames, so that the access point can send the first beacon frame and the second beacon frame to all stations which can listen and receive. Moreover, the transmission bandwidth of the first beacon frame is smaller than that of the second beacon frame, for example, the transmission bandwidth of the first beacon frame is 5MHz, and the transmission bandwidth of the second beacon frame is 20MHz, so that the transmission speed of the second beacon frame is ensured, the second beacon frame is prevented from occupying a longer spectrum time, and power saving of a station is facilitated.
In any one of the above technical solutions, preferably, before the sending the first beacon frame and the second beacon frame to the station, the method further includes: negotiating a sleep period of the primary communication interface with the station to transmit the first beacon frame to the station according to the sleep period; and/or acquiring the time when the main communication interface starts to sleep last time, and sending the first beacon frame to the station when a preset time after the time is reached.
In this technical solution, the first beacon frame may be sent to the station according to a sleep cycle of a primary communication interface of the station, so that the station periodically determines whether to wake up the primary communication interface. The first beacon frame may also be sent to the station at a preset time after the primary communication interface starts to sleep without negotiating a sleep period with the station.
A second aspect of the present invention provides a device for time synchronization of a wireless local area network, which is applied to an access point side, and the device for time synchronization of a wireless local area network includes: a generating unit configured to sequentially generate a first beacon frame and a second beacon frame; a sending unit, configured to send the first beacon frame and the second beacon frame to a station, where the first beacon frame includes a wakeup information element, the second beacon frame includes a time synchronization function parameter, the wakeup information element is used to indicate whether the station wakes up its main communication interface, so as to receive the second beacon frame through the main communication interface when the main communication interface is woken up, and the time synchronization function parameter is used to synchronize times of the access point and the station.
In the technical scheme, a first Beacon frame (i.e., a WUR Beacon frame) and a second Beacon frame (i.e., a normal Beacon frame) are sent to a station, and because the first Beacon frame carries a wakeup information element, the wakeup information element can indicate whether the station wakes up a main communication interface of the station, and therefore, when the main communication interface of the station is woken up, the second Beacon frame can be received through the main communication interface. And the second beacon frame carries a Time Synchronization Function (TSF) parameter, which can ensure the Time Synchronization between the access point and the station in sleep, so as to meet the requirement of ieee802.11ba and achieve the purpose of saving station power consumption.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", where a bit position corresponding to the association identifier ID of the wake-up information element is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID of the wake-up information element is "0" to not wake up the main communication interface.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries time synchronization function parameters, so that the time synchronization of the access point and the station in dormancy is realized.
In any of the above technical solutions, preferably, the first beacon frame and the second beacon frame are broadcast message frames, where a transmission bandwidth of the first beacon frame is smaller than a transmission bandwidth of the second beacon frame.
In the technical scheme, the first beacon frame and the second beacon frame are broadcast message frames, so that the access point can send the first beacon frame and the second beacon frame to all stations which can listen and receive. Moreover, the transmission bandwidth of the first beacon frame is smaller than that of the second beacon frame, for example, the transmission bandwidth of the first beacon frame is 5MHz, and the transmission bandwidth of the second beacon frame is 20MHz, so that the transmission speed of the second beacon frame is ensured, the second beacon frame is prevented from occupying a longer spectrum time, and power saving of a station is facilitated.
In any of the above technical solutions, preferably, the method further includes: a negotiating unit 206, configured to negotiate a sleep cycle of the primary communication interface with the station, so that the sending unit sends the first beacon frame to the station according to the sleep cycle; and/or the obtaining unit 208 is configured to obtain a time when the main communication interface has started to sleep last time, so that the sending unit sends the first beacon frame to the station when a preset time after the time is reached.
In this technical solution, the first beacon frame may be sent to the station according to a sleep cycle of a primary communication interface of the station, so that the station periodically determines whether to wake up the primary communication interface. The first beacon frame may also be sent to the station at a preset time after the primary communication interface starts to sleep without negotiating a sleep period with the station.
A third aspect of the present invention provides an access point, including the apparatus for time synchronization of a wireless local area network according to any of the above second aspects, so that the access point has the same technical effect as the apparatus for time synchronization of a wireless local area network according to any of the above second aspects, and details thereof are not repeated herein.
The fourth aspect of the present invention provides a method for time synchronization of a wireless local area network, which is applicable to a station side, where the station includes a primary communication interface and a secondary communication interface, and the method for time synchronization of a wireless local area network includes: receiving, over the secondary communication interface, a first beacon frame including a wake-up information element sent from an access point; determining whether to awaken the main communication interface according to the awakening information element; if the main communication interface is awakened, receiving a second beacon frame which is sent by the access point and comprises a time synchronization function parameter through the main communication interface; and synchronizing the time of the access point and the station according to the time synchronization function parameter.
In the technical scheme, the primary communication interface and the secondary communication interface of the station may be different physical hardware entities, and the primary communication interface and the secondary communication interface may also be the same physical hardware entity, which is only logically distinguished. Because the first beacon frame carries the wakeup information element, the station can determine whether to wake up the main communication interface of the station according to the wakeup information element, and when the main communication interface of the station is woken up, the second beacon frame can be received through the main communication interface. In addition, the second beacon frame carries a Time Synchronization Function (TSF) parameter, and the Time Synchronization Function parameter can ensure Time Synchronization between the access point and the station in the sleep state, so that the ieee802.11ba requirement is met, and the purpose of saving station power consumption is achieved.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", where a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries the time synchronization function parameter, so that the time synchronization of the access point and the station in the dormancy is realized according to the time synchronization function parameter.
A fifth aspect of the present invention provides a device for time synchronization of a wireless local area network, which is applicable to a station side, where the station includes a primary communication interface and a secondary communication interface, and the device for time synchronization of a wireless local area network includes: a first receiving unit, configured to receive, through the secondary communication interface, a first beacon frame including a wakeup information element sent from an access point; a determining unit, configured to determine whether to wake up the primary communication interface according to the wake-up information element; a second receiving unit, configured to receive, through the main communication interface, a second beacon frame including a time synchronization function parameter sent from the access point if the main communication interface is woken up; and the time synchronization unit is used for synchronizing the time of the access point and the time of the station according to the time synchronization function parameter.
In the technical scheme, because the first beacon frame carries the wakeup information element, the station can determine whether to wake up the main communication interface of the station according to the wakeup information element, and when the main communication interface of the station is woken up, the second beacon frame can be received through the main communication interface. In addition, the second beacon frame carries a Time Synchronization Function (TSF) parameter, and the Time Synchronization Function parameter can ensure Time Synchronization between the access point and the station in the sleep state, so that the ieee802.11ba requirement is met, and the purpose of saving station power consumption is achieved.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", where a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries the time synchronization function parameter, so that the time synchronization of the access point and the station in the dormancy is realized according to the time synchronization function parameter.
A sixth aspect of the present invention provides a station, including the apparatus for time synchronization in a wireless local area network according to any of the above fifth aspects, so that the station has the same technical effects as the apparatus for time synchronization in a wireless local area network according to any of the above fifth aspects, and details thereof are not repeated herein.
By the technical scheme of the invention, the time synchronization of the access point and the station in dormancy can be ensured.
Drawings
Fig. 1 shows a flow diagram of a method for wireless local area network time synchronization on the access point side according to an embodiment of the invention;
fig. 2 shows a block diagram of an apparatus adapted for wireless local area network time synchronization on the access point side according to an embodiment of the present invention;
fig. 3 shows a block diagram of an access point according to an embodiment of the invention;
fig. 4 shows a flow diagram of a method for wireless local area network time synchronization on the site side according to an embodiment of the invention;
fig. 5 shows a block diagram of an apparatus adapted for wireless local area network time synchronization on the site side according to an embodiment of the present invention;
fig. 6 shows a block diagram of a station according to an embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 shows a flow diagram of a method for wireless local area network time synchronization on the access point side according to an embodiment of the present invention.
As shown in fig. 1, a method for time synchronization of a wireless local area network according to an embodiment of the present invention is applicable to an access point, and the method for time synchronization of a wireless local area network includes:
And step 104, sending a first beacon frame and a second beacon frame to the station, where the first beacon frame includes a wakeup information element, the second beacon frame includes a time synchronization function parameter, the wakeup information element is used to indicate whether the station wakes up its main communication interface, so as to receive the second beacon frame through the main communication interface when the main communication interface is woken up, and the time synchronization function parameter is used to synchronize the time of the access point and the station.
In the technical scheme, a first Beacon frame (i.e., a WUR Beacon frame) and a second Beacon frame (i.e., a normal Beacon frame) are sent to a station, and because the first Beacon frame carries a wakeup information element, the wakeup information element can indicate whether the station wakes up a main communication interface of the station, and therefore, when the main communication interface of the station is woken up, the second Beacon frame can be received through the main communication interface. And the second beacon frame carries a Time Synchronization Function (TSF) parameter, which can ensure the Time Synchronization between the access point and the station in sleep, so as to meet the requirement of ieee802.11ba and achieve the purpose of saving station power consumption.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to not wake up the main communication interface.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries time synchronization function parameters, so that the time synchronization of the access point and the station in dormancy is realized.
In any of the above technical solutions, preferably, the first beacon frame and the second beacon frame are broadcast message frames, where a transmission bandwidth of the first beacon frame is smaller than a transmission bandwidth of the second beacon frame.
In the technical scheme, the first beacon frame and the second beacon frame are broadcast message frames, so that the access point can send the first beacon frame and the second beacon frame to all stations which can listen and receive. Moreover, the transmission bandwidth of the first beacon frame is smaller than that of the second beacon frame, for example, the transmission bandwidth of the first beacon frame is 5MHz, and the transmission bandwidth of the second beacon frame is 20MHz, so that the transmission speed of the second beacon frame is ensured, the second beacon frame is prevented from occupying a longer spectrum time, and power saving of a station is facilitated.
In any of the above technical solutions, preferably, the wake-up information element only wakes up the stations in a specific certain group each time, so that it can be ensured that the wake-up information element is as short as possible, and compression of the wake-up information element is achieved.
In any of the above technical solutions, preferably, before the transmitting the first beacon frame and the second beacon frame to the station, the method further includes: negotiating a sleep cycle of a primary communication interface with a station to transmit a first beacon frame to the station according to the sleep cycle; and/or acquiring the time when the main communication interface starts to sleep last time, so as to send the first beacon frame to the station when the preset time after the arrival time.
In this technical solution, the first beacon frame may be sent to the station according to a sleep cycle of a primary communication interface of the station, so that the station periodically determines whether to wake up the primary communication interface. The first beacon frame may also be sent to the station at a preset time after the primary communication interface starts to sleep without negotiating a sleep period with the station.
Fig. 2 shows a block diagram of an apparatus adapted for wireless local area network time synchronization on the access point side according to an embodiment of the present invention.
As shown in fig. 2, an apparatus 200 for time synchronization of a wireless local area network according to an embodiment of the present invention is adapted to an access point, and the apparatus 200 for time synchronization of a wireless local area network includes: a generating unit 202 and a transmitting unit 204.
A generating unit 202, configured to sequentially generate a first beacon frame and a second beacon frame; a sending unit 204, configured to send a first beacon frame and a second beacon frame to a station, where the first beacon frame includes a wakeup information element, and the second beacon frame includes a time synchronization function parameter, where the wakeup information element is used to indicate whether the station wakes up its main communication interface, so as to receive the second beacon frame through the main communication interface when the main communication interface is woken up, and the time synchronization function parameter is used to synchronize times of the access point and the station.
In the technical scheme, a first Beacon frame (i.e., a WUR Beacon frame) and a second Beacon frame (i.e., a normal Beacon frame) are sent to a station, and because the first Beacon frame carries a wakeup information element, the wakeup information element can indicate whether the station wakes up a main communication interface of the station, and therefore, when the main communication interface of the station is woken up, the second Beacon frame can be received through the main communication interface. And the second beacon frame carries a Time Synchronization Function (TSF) parameter, which can ensure the Time Synchronization between the access point and the station in sleep, so as to meet the requirement of ieee802.11ba and achieve the purpose of saving station power consumption.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to not wake up the main communication interface.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries time synchronization function parameters, so that the time synchronization of the access point and the station in dormancy is realized.
In any of the above technical solutions, preferably, the first beacon frame and the second beacon frame are broadcast message frames, where a transmission bandwidth of the first beacon frame is smaller than a transmission bandwidth of the second beacon frame.
In the technical scheme, the first beacon frame and the second beacon frame are broadcast message frames, so that the access point can send the first beacon frame and the second beacon frame to all stations which can listen and receive. Moreover, the transmission bandwidth of the first beacon frame is smaller than that of the second beacon frame, for example, the transmission bandwidth of the first beacon frame is 5MHz, and the transmission bandwidth of the second beacon frame is 20MHz, so that the transmission speed of the second beacon frame is ensured, the second beacon frame is prevented from occupying a longer spectrum time, and power saving of a station is facilitated.
In any of the above technical solutions, preferably, the method further includes: a negotiation unit 206, configured to negotiate a sleep cycle of the primary communication interface with the station, so that the sending unit sends the first beacon frame to the station according to the sleep cycle; and/or the obtaining unit 208 is configured to obtain a time when the main communication interface has started sleep last time, so that the transmitting unit transmits the first beacon frame to the station at a preset time after the arrival time.
In this technical solution, the first beacon frame may be sent to the station according to a sleep cycle of a primary communication interface of the station, so that the station periodically determines whether to wake up the primary communication interface. The first beacon frame may also be sent to the station at a preset time after the primary communication interface starts to sleep without negotiating a sleep period with the station.
In a specific implementation, the generating unit 202, the negotiating unit 206 and the obtaining unit 208 may be a central processor or a baseband processor, and the like, and the transmitting unit 204 may be a transmitter or an antenna, and the like.
Fig. 3 shows a block diagram of an access point according to an embodiment of the invention.
As shown in fig. 3, the access point 300 according to an embodiment of the present invention includes the apparatus 200 for time synchronization of a wireless lan according to any of the above-mentioned second aspects, and therefore, the access point 300 has the same technical effect as the apparatus 200 for time synchronization of a wireless lan according to any of the above-mentioned second aspects, and is not described herein again.
In particular implementations, the access point 300 may be a router or a base station device.
Fig. 4 shows a flowchart of a method for time synchronization of a wireless local area network on a station side according to an embodiment of the present invention.
As shown in fig. 4, a method for time synchronization in a wireless local area network according to an embodiment of the present invention is applicable to a station side, where the station includes a primary communication interface and a secondary communication interface, for example, the primary communication interface and the secondary communication interface are antennas, and the primary communication interface and the secondary communication interface of the station may be different physical hardware entities, and the primary communication interface and the secondary communication interface may also be the same physical hardware entity, but are logically distinguished, and the method for time synchronization in a wireless local area network includes:
at step 402, a first beacon frame including a wake-up information element sent from an access point is received over a secondary communication interface.
And 406, if the main communication interface is awakened, receiving a second beacon frame including a time synchronization function parameter sent by the access point through the main communication interface.
In step 408, the access point and the station are time synchronized according to the time synchronization function parameter.
In the technical scheme, because the first beacon frame carries the wakeup information element, the station can determine whether to wake up the main communication interface of the station according to the wakeup information element, and when the main communication interface of the station is woken up, the second beacon frame can be received through the main communication interface. In addition, the second beacon frame carries a Time Synchronization Function (TSF) parameter, and the Time Synchronization Function parameter can ensure Time Synchronization between the access point and the station in the sleep state, so that the ieee802.11ba requirement is met, and the purpose of saving station power consumption is achieved.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries the time synchronization function parameter, so that the time synchronization of the access point and the station in the dormancy is realized according to the time synchronization function parameter.
Fig. 5 shows a block diagram of an apparatus adapted for wireless local area network time synchronization on the site side according to an embodiment of the present invention.
As shown in fig. 5, an apparatus 500 for time synchronization in a wireless local area network according to an embodiment of the present invention is adapted to a station side, where the station includes a primary communication interface and a secondary communication interface, for example, the primary communication interface and the secondary communication interface are receiving antennas, and the primary communication interface and the secondary communication interface of the station may be different physical hardware entities, and the primary communication interface and the secondary communication interface may also be the same physical hardware entity, but are logically differentiated, and the apparatus 500 for time synchronization in a wireless local area network includes: a first receiving unit 502, a determining unit 504, a second receiving unit 506 and a time synchronizing unit 508.
A first receiving unit 502, configured to receive, through the secondary communication interface, a first beacon frame including a wakeup information element sent from the access point; a determining unit 504, configured to determine whether to wake up the primary communication interface according to the wake-up information element; a second receiving unit 506, configured to receive, through the main communication interface, a second beacon frame including a time synchronization function parameter sent from the access point if the main communication interface is woken up; a time synchronization unit 508, configured to synchronize the time of the access point and the station according to the time synchronization function parameter.
In the technical scheme, because the first beacon frame carries the wakeup information element, the station can determine whether to wake up the main communication interface of the station according to the wakeup information element, and when the main communication interface of the station is woken up, the second beacon frame can be received through the main communication interface. In addition, the second beacon frame carries a Time Synchronization Function (TSF) parameter, and the Time Synchronization Function parameter can ensure Time Synchronization between the access point and the station in the sleep state, so that the ieee802.11ba requirement is met, and the purpose of saving station power consumption is achieved.
In the foregoing technical solution, preferably, a bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", a bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and a bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
In the technical scheme, the wakeup information element is similar to tim (traffic Indication map) information, and if a bit position corresponding to an Association identifier ID (AID) of the wakeup information element is "1", it indicates that the main communication interface is waken up, and after the main communication interface is waken up, it indicates that the main communication interface needs to listen to a second beacon frame broadcasted by the access point after the first beacon frame. The second beacon frame carries the time synchronization function parameter, so that the time synchronization of the access point and the station in the dormancy is realized according to the time synchronization function parameter.
In any of the above technical solutions, preferably, the station determines the period of receiving the first beacon frame by receiving the WUR action frame transmitted from the access point.
In a specific implementation, the determining unit 504 and the time synchronizing unit 508 may be a central processor or a baseband processor, and the like, and the first receiving unit 502 and the second receiving unit 506 may be receivers or antennas, and the like.
Fig. 6 shows a block diagram of a station according to an embodiment of the invention.
As shown in fig. 6, a station 600 according to an embodiment of the present invention includes the apparatus 500 for time synchronization of a wireless local area network in any of the above-mentioned fifth aspects, and therefore, the station 600 has the same technical effects as the apparatus 500 for time synchronization of a wireless local area network in any of the above-mentioned fifth aspects, and is not described herein again.
In a specific implementation, the station 600 may be a smart phone or a PDA (Personal Digital Assistant).
The technical scheme of the invention is described in detail in the above with reference to the attached drawings, and the time synchronization between the access point and the station in the sleep state can be ensured through the technical scheme of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method for wireless local area network time synchronization is applicable to an access point side, and is characterized in that the method for wireless local area network time synchronization comprises the following steps:
sequentially generating a first beacon frame and a second beacon frame;
transmitting the first beacon frame and the second beacon frame to a station,
wherein the first beacon frame includes a wake-up information element, the second beacon frame includes a time synchronization function parameter, the wake-up information element is used to indicate whether the station wakes up its primary communication interface to receive the second beacon frame through the primary communication interface when the primary communication interface is woken up, and the time synchronization function parameter is used to synchronize the time of the access point and the station;
the first beacon frame and the second beacon frame are broadcast message frames, wherein the transmission bandwidth of the first beacon frame is smaller than the transmission bandwidth of the second beacon frame.
2. The method of wireless local area network time synchronization of claim 1,
the bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", the bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and the bit position corresponding to the association identifier ID is "0" to not wake up the main communication interface.
3. The method of wireless local area network time synchronization according to claim 1 or 2, wherein before the transmitting the first beacon frame and the second beacon frame to the station, further comprising:
negotiating a sleep period of the primary communication interface with the station to transmit the first beacon frame to the station according to the sleep period; and/or
And acquiring the time when the main communication interface starts to sleep last time, and sending the first beacon frame to the station when the preset time after the time is reached.
4. An apparatus for time synchronization of wireless local area network, adapted to an access point side, the apparatus for time synchronization of wireless local area network comprising:
a generating unit configured to sequentially generate a first beacon frame and a second beacon frame;
a transmitting unit configured to transmit the first beacon frame and the second beacon frame to a station,
wherein the first beacon frame includes a wake-up information element, the second beacon frame includes a time synchronization function parameter, the wake-up information element is used to indicate whether the station wakes up its primary communication interface to receive the second beacon frame through the primary communication interface when the primary communication interface is woken up, and the time synchronization function parameter is used to synchronize the time of the access point and the station;
the first beacon frame and the second beacon frame are broadcast message frames, wherein the transmission bandwidth of the first beacon frame is smaller than the transmission bandwidth of the second beacon frame.
5. The WLAN time synchronization apparatus of claim 4,
the bit position corresponding to the association identifier ID of the wake-up information element is "1" or "0", the bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and the bit position corresponding to the association identifier ID is "0" to not wake up the main communication interface.
6. The apparatus for wireless local area network time synchronization according to claim 4 or 5, further comprising:
a negotiation unit, configured to negotiate a sleep cycle of the primary communication interface with the station, so that the sending unit sends the first beacon frame to the station according to the sleep cycle; and/or
An obtaining unit, configured to obtain a time when the main communication interface starts to sleep last time, so that the sending unit sends the first beacon frame to the station when a preset time after the time is reached.
7. An access point, comprising: the apparatus for wireless local area network time synchronization of any one of claims 4 to 6.
8. A method for time synchronization of wireless local area network is applied to a station side, the station comprises a primary communication interface and a secondary communication interface, and the method for time synchronization of wireless local area network comprises:
receiving, over the secondary communication interface, a first beacon frame including a wake-up information element sent from an access point;
determining whether to awaken the main communication interface according to the awakening information element;
if the main communication interface is awakened, receiving a second beacon frame which is sent by the access point and comprises a time synchronization function parameter through the main communication interface;
synchronizing the time of the access point and the station according to the time synchronization function parameter;
the first beacon frame and the second beacon frame are broadcast message frames, wherein the transmission bandwidth of the first beacon frame is smaller than the transmission bandwidth of the second beacon frame.
9. The method of wireless local area network time synchronization of claim 8,
the bit position corresponding to the association identifier ID of the wakeup information element is "1" or "0", the bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and the bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
10. A device for time synchronization of wireless local area network is applicable to a station side, the station comprises a primary communication interface and a secondary communication interface, the device for time synchronization of wireless local area network comprises:
a first receiving unit, configured to receive, through the secondary communication interface, a first beacon frame including a wakeup information element sent from an access point;
a determining unit, configured to determine whether to wake up the primary communication interface according to the wake-up information element;
a second receiving unit, configured to receive, through the main communication interface, a second beacon frame including a time synchronization function parameter sent from the access point if the main communication interface is woken up;
a time synchronization unit, configured to synchronize the time of the access point and the time of the station according to the time synchronization function parameter;
the first beacon frame and the second beacon frame are broadcast message frames, wherein the transmission bandwidth of the first beacon frame is smaller than the transmission bandwidth of the second beacon frame.
11. The WLAN time synchronization apparatus of claim 10,
the bit position corresponding to the association identifier ID of the wakeup information element is "1" or "0", the bit position corresponding to the association identifier ID is "1" to wake up the main communication interface, and the bit position corresponding to the association identifier ID is "0" to keep the main communication interface in a sleep state.
12. A station, comprising: the apparatus for wireless local area network time synchronization of claim 10 or 11.
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| US9191891B2 (en) * | 2012-11-02 | 2015-11-17 | Qualcomm Incorporated | Systems and methods for low power wake-up signal implementation and operations for WLAN |
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| CN104756560A (en) * | 2012-10-24 | 2015-07-01 | 高通股份有限公司 | Near passive receivers with regular PS mode and no ULP (AP is not aware of the receiver/circuit mode) |
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