CN113395753B - Method and system for synchronizing wireless terminal and base station and wireless terminal - Google Patents
Method and system for synchronizing wireless terminal and base station and wireless terminal Download PDFInfo
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- CN113395753B CN113395753B CN202110941541.4A CN202110941541A CN113395753B CN 113395753 B CN113395753 B CN 113395753B CN 202110941541 A CN202110941541 A CN 202110941541A CN 113395753 B CN113395753 B CN 113395753B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a method for synchronizing a wireless terminal and a base station, which comprises the following steps for the wireless terminal: sequentially receiving synchronous frame signals sent by each base station in a preset frame sending period; in a preset frame sending period, each synchronous frame signal is not overlapped with other synchronous frame signals on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than the preset frame sending period; determining a base station corresponding to one synchronous frame signal in all received synchronous frame signals as a synchronous base station, synchronizing with the synchronous base station and waking up according to a preset listening frame period; the preset listening frame period is an integral multiple of the preset sending frame period. A wireless terminal for performing the above method, and a system for synchronizing the wireless terminal with a base station are also provided. By the method and the system for synchronizing the wireless terminal and the base station and the wireless terminal, the base station can be quickly determined and a synchronization relation can be established, so that the real-time performance of service response is improved.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and a system for synchronizing a wireless terminal and a base station, and a wireless terminal.
Background
With the development of science and technology, the global large-scale business basically realizes digital upgrading and transformation, and in digital application, a wireless terminal such as an electronic price tag can replace a traditional paper tag. Besides displaying common information, the wireless terminal can also realize various other applications, such as quick order picking, stock out management, quick inventory, man-machine interaction and the like. The wireless terminal is limited by the capacity of the battery, is in a dormant state most of the time, and only wakes up periodically to receive signals sent by the base station.
However, in the prior art, the wireless terminal and the base station usually adopt an asynchronous communication mode, and the base station continuously transmits a signal with a certain duration to wake up the wireless terminal and then complete the communication. This results in poor real-time response of the service.
In addition, the base station does not transmit signals at ordinary times, and only transmits the signals when needed, so that the wireless terminal cannot quickly compare the received signals of the base station to determine the base station suitable for communication after new network access or position movement occurs.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a system for synchronizing a wireless terminal and a base station and the wireless terminal.
In a first aspect, the present invention provides a method for a wireless terminal to synchronize with a base station, comprising:
sequentially receiving synchronous frame signals sent by each base station in a preset frame sending period; in a preset frame sending period, each synchronous frame signal is not overlapped with synchronous frame signals sent by other base stations on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than the preset frame sending period;
determining a base station corresponding to one of all received synchronous frame signals as a synchronous base station, synchronizing with the synchronous base station, and waking up according to a preset listening frame period to receive the synchronous frame signal sent by the synchronous base station; the preset listening frame period is an integral multiple of the preset sending frame period.
In one embodiment, two adjacent synchronization frame signals within a preset transmission frame period from the beginning of the first base station are adjacent to each other on a time slice.
In one embodiment, determining a base station corresponding to one of all received synchronization frame signals as a synchronization base station includes:
and taking the base station corresponding to the synchronization frame signal with the strongest signal in all the received synchronization frame signals as the synchronization base station.
In one embodiment, after the steps of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
after waking up, detecting whether a signal corresponding to a synchronization frame signal sent by a synchronization base station which is currently received is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received;
if so, entering the sleep mode and then waking up again before the first base station sends the synchronous frame signal;
and receiving the synchronous frame signal sent by each base station, re-determining the synchronous base stations and synchronizing.
In one embodiment, after the steps of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
after waking up, detecting whether a signal corresponding to a synchronization frame signal sent by a synchronization base station which is currently received is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received;
if yes, the synchronous frame signals sent by all the rest base stations are continuously received, and the synchronous base stations are re-determined and synchronized.
In one embodiment, after the steps of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
after waking up, detecting whether the timestamp of the currently received synchronous frame signal is consistent with the current timestamp of the synchronous frame signal, and if not, determining that time deviation occurs;
and calculating the time difference value between the time stamp of the currently received synchronous frame signal and the current time stamp of the synchronous frame signal, and adjusting according to the time difference value.
In one embodiment, after the step of calculating a time difference between the timestamp of the currently received synchronization frame signal and the current timestamp of the synchronization frame signal, and adjusting according to the time difference, the method further includes:
if the current time stamp of the self is advanced relative to the time stamp of the currently received synchronous frame signal; the reception is continued until the sync frame signal transmitted from the sync base station is received, or enters into sleep and then wakes up again when the sync base station transmits the sync frame signal and receives the sync frame signal transmitted from the sync base station.
In one embodiment, after the step of calculating a time difference between the timestamp of the currently received synchronization frame signal and the current timestamp of the synchronization frame signal, and adjusting according to the time difference, the method further includes:
if the current time stamp of the synchronous base station is delayed relative to the time stamp of the currently received synchronous frame signal, the synchronous base station enters dormancy after setting the dormancy time length required by compensation and then wakes up again when the synchronous base station sends the synchronous frame signal and receives the synchronous frame signal sent by the synchronous base station.
In a second aspect, in one embodiment, the present invention provides a wireless terminal, including a memory and a processor, where the memory stores a computer program, and the processor executes the computer program to make the processor perform any one of the above methods for synchronizing the wireless terminal with a base station.
In a third aspect, the present invention provides, in one embodiment, a system for synchronizing a wireless terminal with a base station, comprising;
a plurality of base stations, each for transmitting a synchronization frame signal at a preset transmission frame period; in a preset frame sending period, each synchronous frame signal is not overlapped with other synchronous frame signals on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than the preset frame sending period;
the wireless terminal is used for receiving the synchronous frame signals sent by each base station in sequence, determining the base station corresponding to one synchronous frame signal in all the received synchronous frame signals as a synchronous base station, synchronizing with the synchronous base station and waking up in a preset listening frame period; the preset listening frame period is an integral multiple of the preset sending frame period.
Has the advantages that:
by the method and the system for synchronizing the wireless terminal and the base stations and the wireless terminal, each base station sends the synchronous frame signal in the preset frame sending period, and the wireless terminal can receive the synchronous frame signals sent by all the base stations only by receiving the signals with the duration less than the preset frame sending period, so that the base stations can be determined quickly, and the power consumption is reduced; and the synchronization relationship can be established based on the fact that the preset listening frame period is an integral multiple of the preset sending frame period.
In addition, after the synchronization relationship is established, the base station can default that the wireless terminal wakes up with the appointed time stamp, so that when the target data is required to be transmitted, the base station can pack the time stamp of the subsequent transmission target data in the synchronization frame signal transmitted when the wireless terminal wakes up, and the base station can finish the transmission of the target data in a short time, thereby improving the real-time performance of service response.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a flow chart illustrating synchronization of a wireless terminal with a base station in accordance with an embodiment of the present invention;
FIG. 2 is a diagram illustrating a structure of each BS transmitting a synchronization frame signal according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a comparison relationship between a preset listening frame period and a preset sending frame period in an embodiment of the present invention;
FIG. 4 is a block diagram of a wireless terminal receiving a synchronization frame signal according to an embodiment of the present invention;
FIG. 5 is a flow chart illustrating a process of a wireless terminal finding a new base station and re-synchronizing after moving position according to an embodiment of the present invention;
FIG. 6 is a block diagram illustrating an embodiment of a wireless terminal finding a new base station and re-synchronizing after moving its location;
FIG. 7 is a flow chart illustrating a process of a wireless terminal finding a new base station and re-synchronizing after moving the location according to another embodiment of the present invention;
FIG. 8 is a block diagram illustrating a wireless terminal finding a new base station and re-synchronizing after moving its location according to another embodiment of the present invention;
FIG. 9 is a flow chart illustrating the process of receiving a synchronization frame signal of a synchronous base station after adjusting the time offset according to an embodiment of the present invention;
FIG. 10 is a block diagram illustrating a structure of a synchronization frame signal received from a synchronous base station after adjusting a time offset according to an embodiment of the present invention;
FIG. 11 is a flow chart illustrating a process of receiving a synchronization frame signal of a synchronous base station after adjusting a time offset according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of a synchronization frame signal of a receiving synchronization base station after adjusting a time offset according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, as shown in fig. 1, in one embodiment, the present invention provides a method for a wireless terminal to synchronize with a base station, comprising:
As shown in fig. 2, in a preset frame sending period, each synchronization frame signal does not overlap with synchronization frame signals sent by other base stations on a time slice, and the sum of the time lengths of all the synchronization frame signals is less than the preset frame sending period.
The system for synchronizing the corresponding wireless terminal and the base station comprises a central control server, the base station and the wireless terminal, wherein the central control server configures time parameters for the base station to send synchronous frame signals, so that the synchronous frame signals sent by all the base stations are not overlapped on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than a preset frame sending period.
Each synchronization frame signal is of the same frequency, and therefore cannot be sent simultaneously, and it is necessary to control each synchronization frame signal not to overlap on a time slice, otherwise, signal fusion is caused, and the wireless terminal cannot receive the signals.
The reason why the sum of the time lengths of all the synchronization frame signals is controlled to be smaller than the preset frame sending period is to reserve a time period for the base station to send the target data, otherwise, the target data cannot be sent.
And step 104, determining a base station corresponding to one of the received synchronization frame signals as a synchronization base station, synchronizing with the synchronization base station, and waking up according to a preset listening frame period to receive the synchronization frame signal sent by the synchronization base station.
Wherein, the wireless terminal can select a suitable base station as the synchronization base station according to the actual situation, such as considering the communication quality.
As shown in fig. 3, the preset listening frame period is an integer multiple of the preset sending frame period. The integral multiple is set to ensure that the wireless terminal can receive the synchronous frame signal every time the wireless terminal wakes up; specifically, if no time offset occurs, the synchronization frame signal sent by the synchronization base station can be received each time the synchronization base station wakes up, and if the time offset occurs, the synchronization frame signal of another base station can still be received.
The synchronization frame signal sent by each base station comprises a plurality of frames, each frame occupies a time slice of hundreds of microseconds, and each synchronization frame signal occupies a time slice of a few milliseconds. When the wireless terminal receives, it may receive only a few frames of the synchronization frame signal transmitted by each base station, and then may obtain the corresponding result by averaging.
The wireless terminal may receive and compare only the synchronization frame signals in one preset transmission frame period, or may receive and compare the synchronization frame signals in a plurality of preset transmission frame periods.
As shown in fig. 4, in order to make the principle of the present embodiment clearer, an example is given: for example, there are 8 base stations, the preset frame sending period is 1s, each base station sends a 5ms sync frame signal, and the preset listening frame period is 32 s.
Firstly, after a wireless terminal newly accesses a network, the wireless terminal directly receives signals for 1s, and because the preset frame sending period is 1s, the wireless terminal receives 1s and can receive synchronous frame signals respectively sent by all 8 base stations, and finally the wireless terminal determines the synchronous base stations through comparison, so that the synchronous base stations can be determined only through 1s at most.
It should be noted that the base station is configured with a timing axis matched with the preset listening frame period, and the timing axis specifies the number of times that the wireless terminal wakes up each time, such as 32s, 64s, 96s, and the like; when the wireless terminal is synchronized with the synchronization base station, it needs to read the timing number in the synchronization frame signal sent by the synchronization base station, for example, if the read count is 20s whole, it means that the synchronization base station defaults that the wireless terminal will wake up when the count is 32s, so according to the convention, the wireless terminal needs to set the time of next wake-up as the 12 th s later, and similarly, the time of next wake-up is set as the 44 th s later. Of course, in other embodiments, synchronization of the wireless terminal with the synchronization base station may be achieved by means other than the timing axis.
Next, after the wireless terminal establishes a synchronization relationship with the synchronized base station, it wakes up (i.e. wakes up at a preset listening frame period) at the time stamp corresponding to each specified timing number. If the system wants to transmit the target data after the wireless terminal sleeps for 16s, the synchronous base station only needs to pack a timestamp (for example, a certain timestamp in the 17 th next time) of the target data to be transmitted subsequently in the synchronous frame signal transmitted in the 16 th next time, the wireless terminal wakes up in the 16 th next time to receive the synchronous frame signal transmitted by the synchronous base station and reads information of the target data to be transmitted by the subsequent synchronous base station, and then the wireless terminal receives the target data in the certain timestamp in the 17 th next time, so that only 17s of time delay is required from the time when the wireless terminal wants to transmit to the time when the wireless terminal starts to transmit. However, in the asynchronous communication method in the prior art, since the base station does not know when the wireless terminal wakes up, at least 32s of wake-up frame signals need to be transmitted to ensure that the wireless terminal can receive the wake-up frame signals, the base station needs to pack the timestamp of the subsequent transmission target data (for example, a certain timestamp in the 33 th s) in all the 32s of wake-up frame signals, and then the wireless terminal wakes up at a certain timestamp in the 33 th s and receives the target data, so that there is a delay of 33s from the time when the wireless terminal wants to transmit to start transmitting.
By the method for synchronizing the wireless terminal and the base stations, each base station sends the synchronous frame signal in the preset frame sending period, and the wireless terminal can receive the synchronous frame signals sent by all the base stations only by receiving the signals with the duration less than the preset frame sending period, so that the base stations can be determined quickly, and the power consumption is reduced; and the synchronization relationship can be established based on the fact that the preset listening frame period is an integral multiple of the preset sending frame period.
In addition, after the synchronization relationship is established, the base station can default that the wireless terminal wakes up with the appointed time stamp, so that when the target data is required to be transmitted, the base station can pack the time stamp of the subsequent transmission target data in the synchronization frame signal transmitted when the wireless terminal wakes up, and the base station can finish the transmission of the target data in a short time, thereby improving the real-time performance of service response.
As shown in fig. 2, in one embodiment, two adjacent sync frame signals within a predetermined transmission frame period are adjacent on a time slice.
The time for sending the synchronous frame signals by all the base stations can be concentrated by adjacent time slices, so that the wireless terminal can conveniently and quickly finish the receiving of all the synchronous frame signals, and the synchronous base stations are determined; in addition, a complete idle time period can be obtained, and the base station can conveniently send target data.
In one embodiment, determining a base station corresponding to one of all received synchronization frame signals as a synchronization base station includes:
and taking the base station corresponding to the synchronization frame signal with the strongest signal in all the received synchronization frame signals as the synchronization base station.
The strongest signal indicates that the communication quality between the base station and the base station is the best, and the base station is taken as a synchronous base station to perform synchronization, so that the subsequent stable reception of synchronous frame signals can be ensured. Of course, in other embodiments, other factors may also be considered to determine the synchronization base station, which is not limited herein.
As shown in fig. 5 and fig. 6, in an embodiment, after the step of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
step 202, after waking up, it is detected whether a signal corresponding to a synchronization frame signal sent by the synchronization base station that is currently received is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received.
When the signal is detected to be weak or unable to be received, the position of the wireless terminal is moved, and therefore the synchronous base station needs to be determined again.
And step 204, if yes, entering the sleep mode and then waking up again before the first base station sends the synchronous frame signal.
Wherein, compared with the new network access, the position movement is already synchronized, so that the reference point is provided, so that the position movement can enter the sleep state and then start to receive the synchronous frame signal sent by the first base station when the position movement wakes up next time.
The whole process requires that the time length from the first synchronous frame signal to the last synchronous frame signal in the preset frame sending period is necessarily less than the preset frame sending period.
Compared with a mode adopted in new network access, the method has the advantages that the time for receiving signals is shortened, the power consumption of the electronic price tag is reduced, and the endurance is improved.
In one embodiment, after the steps of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
after waking up, detecting whether a signal corresponding to a synchronization frame signal sent by a synchronization base station which is currently received is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received;
if yes, the synchronous frame signals sent by all the rest base stations are continuously received, and the synchronous base stations are re-determined and synchronized.
In this embodiment, compared with the previous embodiment, the wireless terminal does not sleep in the middle, and directly continues to complete signal reception in a preset frame transmission period, so that power consumption is increased.
As shown in fig. 7 and 8, in an embodiment, after the step of synchronizing with the synchronous base station and waking up according to a preset listening frame period, the method further includes:
When the time deviation occurs, the received synchronous frame signal is not transmitted by the synchronous base station.
The clock of the wireless terminal is made to be consistent with the clock of the base station through adjustment, so that the synchronous frame signal sent by the synchronous base station can be conveniently and continuously received subsequently. And the wireless terminal can finish the clock adjustment according to the synchronous frame signal of each base station, so that the wireless terminal can finish the clock adjustment when a large time deviation occurs, the problem is not solved by replacing a high-precision crystal oscillator, and the cost is reduced on the basis of ensuring the performance.
As shown in fig. 9 and 10, in an embodiment, after the step of calculating a time difference between a time stamp of the currently received synchronization frame signal and a current time stamp of the synchronization frame signal, and performing adjustment according to the time difference, the method further includes:
If the time stamp of the wireless terminal is advanced, which indicates that the crystal oscillator frequency of the wireless terminal is too fast, the synchronization base station does not start to transmit the synchronization frame signal, and therefore, the wireless terminal can keep in a wake-up state or sleep until receiving the synchronization frame signal transmitted by the synchronization base station.
As shown in fig. 11 and 12, in an embodiment, after the step of calculating a time difference between a time stamp of the currently received synchronization frame signal and a current time stamp of the synchronization frame signal, and performing adjustment according to the time difference, the method further includes:
If the time stamp of the wireless terminal is delayed, it indicates that the crystal oscillator frequency of the wireless terminal is too slow, and at this time, the synchronization base station has already completed sending the synchronization frame signal, so that the wireless terminal can sleep first and receive the synchronization frame signal sent by the synchronization base station after next waking up.
In a second aspect, in one embodiment, the present invention provides a wireless terminal, including a memory and a processor, where the memory stores a computer program, and the processor executes the computer program to make the processor perform a method for synchronizing the wireless terminal with a base station in any of the above embodiments.
Through the wireless terminal, each base station sends the synchronous frame signal in the preset sending frame period, and the wireless terminal can receive the synchronous frame signals sent by all the base stations only by receiving the signals with duration less than the preset sending frame period, so that the base stations can be determined quickly, and the power consumption is reduced; and the synchronization relationship can be established based on the fact that the preset listening frame period is an integral multiple of the preset sending frame period.
In addition, after the synchronization relationship is established, the base station can default that the wireless terminal wakes up with the appointed time stamp, so that when the target data is required to be transmitted, the base station can pack the time stamp of the subsequent transmission target data in the synchronization frame signal transmitted when the wireless terminal wakes up, and the base station can finish the transmission of the target data in a short time, thereby improving the real-time performance of service response.
In a third aspect, the present invention provides, in one embodiment, a system for synchronizing a wireless terminal with a base station, comprising;
a plurality of base stations, each for transmitting a synchronization frame signal at a preset transmission frame period; in a preset frame sending period, each synchronous frame signal is not overlapped with other synchronous frame signals on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than the preset frame sending period;
the wireless terminal is used for receiving the synchronous frame signals sent by each base station in sequence, determining the base station corresponding to one synchronous frame signal in all the received synchronous frame signals as a synchronous base station, synchronizing with the synchronous base station and waking up in a preset listening frame period; the preset listening frame period is an integral multiple of the preset sending frame period.
Through the system for synchronizing the wireless terminal and the base stations, each base station sends the synchronous frame signals in the preset frame sending period, and the wireless terminal can receive the synchronous frame signals sent by all the base stations only by receiving the signals with the duration less than the preset frame sending period, so that the base stations can be determined quickly, and the power consumption is reduced; and the synchronization relationship can be established based on the fact that the preset listening frame period is an integral multiple of the preset sending frame period.
In addition, after the synchronization relationship is established, the base station can default that the wireless terminal wakes up with the appointed time stamp, so that when the target data is required to be transmitted, the base station can pack the time stamp of the subsequent transmission target data in the synchronization frame signal transmitted when the wireless terminal wakes up, and the base station can finish the transmission of the target data in a short time, thereby improving the real-time performance of service response.
In one embodiment, two adjacent synchronization frame signals within a preset transmission frame period from the beginning of the first base station are adjacent to each other on a time slice.
In one embodiment, each base station determines a time slice for transmitting the synchronization frame signal in a preset frame transmission period according to the distance relationship between the base stations. Specifically, the closer the base stations are, the closer the time slice interval is, and the farther the base stations are, the farther the time slice interval is.
In one embodiment, the wireless terminal is specifically configured to use, as the synchronization base station, a base station corresponding to a synchronization frame signal with a strongest signal among all the received synchronization frame signals.
In one embodiment, the wireless terminal is further configured to detect, after waking up, whether a signal corresponding to a currently received synchronization frame signal sent by the synchronization base station is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received; if so, entering the sleep mode and then waking up again before the first base station sends the synchronous frame signal; and receiving the synchronous frame signal sent by each base station, re-determining the synchronous base stations and synchronizing.
In one embodiment, the wireless terminal is further configured to detect, after waking up, whether a signal corresponding to a currently received synchronization frame signal sent by the synchronization base station is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received; if yes, the synchronous frame signals sent by all the rest base stations are continuously received, and the synchronous base stations are re-determined and synchronized.
In one embodiment, the wireless terminal is further configured to detect whether a timestamp of a currently received synchronization frame signal is consistent with a current timestamp of the wireless terminal after waking up, and if not, considering that a time deviation occurs; and calculating the time difference value between the time stamp of the currently received synchronous frame signal and the current time stamp of the synchronous frame signal, and adjusting according to the time difference value.
In one embodiment, the wireless terminal is further configured to determine whether the current timestamp of the wireless terminal is earlier than a timestamp of a currently received synchronization frame signal; the reception is continued until the sync frame signal transmitted from the sync base station is received, or enters into sleep and then wakes up again when the sync base station transmits the sync frame signal and receives the sync frame signal transmitted from the sync base station.
In one embodiment, the wireless terminal is further configured to go to sleep if its current timestamp is delayed from the timestamp of the currently received synchronization frame signal, and then wake up again when the synchronization base station transmits the synchronization frame signal and receive the synchronization frame signal transmitted by the synchronization base station.
In one embodiment, the base station transmits the synchronization frame signal using 2.4G radio frequency.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A method for a wireless terminal to synchronize with a base station, comprising, for a wireless terminal:
sequentially receiving synchronous frame signals sent by each base station in a preset frame sending period; in one preset frame sending period, each synchronization frame signal is not overlapped with the synchronization frame signals sent by other base stations on a time slice, and the sum of the time lengths of all the synchronization frame signals is less than the preset frame sending period; each base station determines a time slice for sending a synchronous frame signal in the preset frame sending period according to the distance relation between the base stations, wherein the closer the base stations are, the closer the time slice interval is;
determining the base station corresponding to one of the received synchronous frame signals as a synchronous base station, and synchronizing with the synchronous base station;
reading the counting number in the synchronous frame signal sent by the synchronous base station, determining the time of next waking according to the read counting number, and waking according to a preset listening frame period after next waking to receive the synchronous frame signal sent by the synchronous base station; a timing axis matched with the preset listening frame period is set in each base station, and the timing axis designates the timing number of each wake-up of the wireless terminal; the preset listening frame period is an integral multiple of the preset sending frame period;
from the beginning of the transmission of the first base station, two adjacent synchronous frame signals in a later preset frame transmission period are adjacent on a time slice;
after waking up, detecting whether the timestamp of the currently received synchronous frame signal is consistent with the current timestamp of the synchronous frame signal, and if not, determining that time deviation occurs;
and calculating the time difference value between the timestamp of the currently received synchronous frame signal and the current timestamp of the synchronous frame signal, and adjusting according to the time difference value.
2. The method of claim 1, wherein the determining the base station corresponding to one of the received synchronization frame signals as a synchronous base station comprises:
and taking the base station corresponding to the synchronization frame signal with the strongest signal in all the received synchronization frame signals as the synchronization base station.
3. The method of claim 1, wherein after the steps of synchronizing with the synchronized base station and waking up according to a preset listening frame period, the method further comprises:
after waking up, detecting whether a signal corresponding to the synchronization frame signal sent by the synchronization base station and received at present is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received;
if so, entering the sleep mode and then waking up again before the first base station sends the synchronous frame signal;
and receiving the synchronous frame signal sent by each base station, and re-determining the synchronous base stations and synchronizing.
4. The method of claim 1, wherein after the steps of synchronizing with the synchronized base station and waking up according to a preset listening frame period, the method further comprises:
after waking up, detecting whether a signal corresponding to the synchronization frame signal sent by the synchronization base station and received at present is weakened or whether the synchronization frame signal sent by the synchronization base station cannot be received;
if yes, continuing to receive the rest synchronous frame signals sent by all the base stations, and re-determining the synchronous base stations and synchronizing.
5. The method of claim 1, wherein after the step of calculating a time difference between the timestamp of the currently received synchronization frame signal and the current timestamp of the wireless terminal, and adjusting the time difference according to the time difference, the method further comprises:
if the current time stamp of the self is advanced relative to the time stamp of the currently received synchronous frame signal; the receiving is continued until the synchronization frame signal sent by the synchronization base station is received, or the synchronization base station enters into dormancy and then wakes up again when sending the synchronization frame signal and receives the synchronization frame signal sent by the synchronization base station.
6. The method of claim 1, wherein after the step of calculating a time difference between the timestamp of the currently received synchronization frame signal and the current timestamp of the wireless terminal, and adjusting the time difference according to the time difference, the method further comprises:
if the current time stamp of the synchronous base station is delayed relative to the time stamp of the currently received synchronous frame signal, the synchronous base station enters dormancy after setting the dormancy time length required by compensation and then wakes up again when the synchronous base station sends the synchronous frame signal and receives the synchronous frame signal sent by the synchronous base station.
7. A wireless terminal comprising a memory and a processor, the memory having stored thereon a computer program, wherein execution of the computer program by the processor causes the processor to perform a method of synchronizing the wireless terminal with a base station as claimed in any one of claims 1 to 6.
8. A system for synchronizing a wireless terminal with a base station, comprising;
a plurality of base stations, each for transmitting a synchronization frame signal at a preset transmission frame period; in one preset frame sending period, each synchronous frame signal is not overlapped with other synchronous frame signals on a time slice, and the sum of the time lengths of all the synchronous frame signals is less than the preset frame sending period; each base station determines a time slice for sending a synchronous frame signal in the preset frame sending period according to the distance relation between the base stations, wherein the closer the base stations are, the closer the time slice interval is;
the wireless terminal is used for receiving the synchronous frame signals sent by each base station in sequence, determining the base station corresponding to one synchronous frame signal in all the received synchronous frame signals as a synchronous base station and synchronizing with the synchronous base station; reading the counting number in the synchronous frame signal sent by the synchronous base station, determining the time of next waking according to the read counting number, and waking according to a preset listening frame period after next waking to receive the synchronous frame signal sent by the synchronous base station; a timing axis matched with the preset listening frame period is set in each base station, and the timing axis designates the timing number of each wake-up of the wireless terminal; the preset listening frame period is an integral multiple of the preset sending frame period;
from the beginning of the transmission of the first base station, two adjacent synchronous frame signals in a later preset frame transmission period are adjacent on a time slice;
the wireless terminal is also used for detecting whether the timestamp of the currently received synchronous signal is consistent with the current timestamp of the wireless terminal after waking up, and if not, the wireless terminal is considered to have time deviation; and calculating the time difference value between the currently received time stamp of the synchronous signal and the current time stamp of the synchronous signal, and adjusting according to the time difference value.
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