TWI449403B - Method for saving power and power saving mobile terminal - Google Patents

Description

Power saving method and power-saving mobile terminal

The present invention relates to the field of mobile communications, and more particularly to a power saving method and a power-saving mobile terminal.

In the existing mobile multimedia broadcasting system, a frame contains a number of time slots (TS, Time Slot), each time slot includes a beacon and a plurality of orthogonal frequency departments ( OFDM) symbol; the beacon includes at least a synchronization signal; the beacon is usually placed at the beginning of the time slot.

In the current receiving system, when the received signal is normal, the mobile terminal can use the beacon to synchronize with the broadcast signal, and turn on or off the decoding module according to the specified time slot timing, including the receiving channel and the related decoding circuit. However, when the received signal is abnormal, such as poor signal quality, or the signal disappears, the mobile terminal cannot synchronize with the time slot because it cannot receive the synchronization signal in the beacon normally. At this time, the decoding channel is always on, and the detection is continued. The window detects the beacon; this will consume a lot of power. If the signal stops or the abnormal time is long, the terminal will quickly shut down because the power is exhausted, which makes the user inconvenient to use. If the signal is temporarily turned off when the received signal is abnormal, it is impossible to start receiving the signal in time when the signal returns to normal, which also brings a lot of inconvenience to the user.

One of the objects of the present invention is to provide a power saving method and a power-saving mobile terminal to solve the problem that the mobile terminal consumes a large amount of power without a signal or poor signal quality.

In order to solve the above technical problem, the present invention provides a power saving method, comprising: setting a received signal information that is synchronously changed with a received signal at a terminal; and performing a sleep when the terminal cannot normally receive a signal; and receiving a signal according to the received state in a sleep state; Information to determine the time of occurrence of the beacon to detect the beacon.

The present invention further provides a power-saving mobile terminal, comprising a decoding module for receiving signals from a broadcast network; and a control module for transmitting the received signal according to the received signal at the terminal when the decoding module normally receives the received signal The receiving signal information is changed in synchronization with the received signal. When the decoding module cannot receive the signal normally, the decoding module is turned off; and when the decoding module is in the off state, it is determined according to the received signal information. The appearance time of each beacon is to wake up the decoding module to detect the beacon.

The technical means provided by the invention can enable the terminal to enter a sleep state when the receiving signal cannot be received normally, thereby saving power; and the embodiment of the invention can accurately control the time when the decoding module is turned on, so that it can receive the letter. When the time is on, the playback start time after signal recovery is greatly reduced under the premise of power saving.

The technical means of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

The core idea of the present invention is: setting received signal information that changes synchronously with the received signal in the terminal, and causing the terminal to sleep when the received signal is not normally received, because the terminal can still know according to the received signal information while in the sleep state. The precise time at which the beacon can be received, so the terminal only needs to detect when the beacon can be received, and then it can verify whether the received signal returns to normal, and start playing in the fastest time when the received signal returns to normal; The time terminals are all in a sleep state, so power can be saved.

In the embodiment of the present invention, it is assumed that each time slot contains M OFDM symbols and one beacon. For convenience of description, the OFDM symbols and beacons in the time slot are collectively referred to as symbols.

The present invention provides a power saving method. As shown in FIG. 1, the method includes the following steps: A. Turning on the terminal and determining whether the terminal can normally receive the signal. If it is normal, execute step B. If not, perform step E.

The normal received signal according to the embodiment of the present invention means that the strength or quality of the received signal enables the terminal to detect the beacon in the received signal and synchronize.

Step A in the embodiment of the present invention further includes (but should not limit the present invention): determining whether the decoding module in the terminal can normally receive the received signal, and if it can normally receive the received signal, execute Step B: When the received signal disappears or the received signal is abnormal due to environmental obscuration or the like, the decoding module may not receive the received signal normally, and step C is performed at this time. The above determination may be made by the control module in the terminal, but is not limited to the above determination by the control module.

B. Synchronize the terminal with the received signal, and the terminal sets a received signal information that changes in synchronization with the received signal according to the received signal; and performs step C.

Therefore, when the received signal is abnormal and the terminal cannot normally receive the synchronization signal, the time at which each beacon should be received when the received signal is normal can still be determined based on the received signal information.

In step B of the embodiment of the present invention, the terminal sets the received signal information according to the received signal, that is, the terminal counts the symbol synchronized with the symbol in the received signal, and recounts from zero when the count value reaches M+1. .

In step B of the embodiment of the present invention, the terminal setting the received signal information according to the received signal may also mean that the terminal establishes a counter, and synchronizes the counter with the symbol of the actual received signal according to the signal received by the decoding module.

In step B of the embodiment of the present invention, synchronizing the counter with the symbol of the actual received signal means that the counter is incremented by one at the start time of each symbol, and the counter is reset to zero when the count value reaches M+1; The counter can be counted from the time of receipt of the first symbol in the slot, although it is also possible to count from any symbol received.

The counter according to the embodiment of the present invention is driven by a high-accuracy signal source, and the counter can continue to operate when the received signal disappears.

In step B of the embodiment of the present invention, the setting of the received signal information by the terminal according to the received signal may also mean that the terminal sets a timer whose time length is the same as the time length of one time slot; the terminal is at the beginning of the beacon. The timer is started at any time, and then the timer is reset and restarted each time it arrives.

In step A of the embodiment of the present invention, the terminal setting the received signal information according to the received signal may also mean that the terminal sets a timer, and starts the timer at the start time of the beacon, when the time length of the time is one time When the slot has the same length of time, it is zeroed and the timer is started again.

Since the position of the beacon in each time slot is fixed, the terminal can determine the start time of the beacon according to a timer or a timer. The method of setting the received signal information by the timer or the timer is not limited to the above description, and any technical method conforming to the spirit of the invention can be employed.

Compared with the method of using a timer or a timer, the method of using the tracking frequency, that is, using the counter as the received signal information is more accurate.

C. The terminal works normally. When the signal cannot be received normally, proceed to step D.

The step C described in the embodiment of the present invention may include the following techniques, but not limited thereto: the terminal monitors the operation of the decoding module, and when there is a situation in which the signal cannot be normally received, step D is performed. The control module can also be monitored, but not limited thereto.

D. The terminal enters a sleep state, and determines the occurrence time of each beacon according to the received signal information, thereby detecting the beacon. When the beacon is detected, it indicates that the received signal can be normally received. At this time, the terminal resumes normal operation, and returns to step C; if it is not detected, it returns to step D.

The working mode of the terminal in this step is called synchronous power saving mode, as shown in Figure 2.

In the step D described in the embodiment of the present invention, the terminal enters the sleep state to close the decoding module.

In step D of the embodiment of the present invention, the terminal determines the occurrence time of each beacon according to the received signal information, and detecting the beacon in the time is: the terminal determines each letter according to the symbol count value. The appearance time of the target wakes up the decoding module to detect the beacon.

The step D of the embodiment of the present invention may include the following technologies, but not limited thereto: the terminal turns off the decoding module, and starts monitoring the count value in the counter, and determines the occurrence time of the beacon according to the count value, and wakes up. The decoding module detects a beacon. When the beacon is detected, it returns to step C; if the beacon is not detected, it returns to step D. The decoding module and the monitoring counter can be turned off by using the control module in the terminal.

If it takes a period of time to start the decoding module, and the counter will drift a certain amount, it is necessary to wake up the decoding module before deltaT1 before the start time of each beacon. If the beacon is not detected, then in the letter After the end of the target, the time delay deltT2 is returned to step D, that is, the decoding module is closed again. Therefore, each time the decoding module detects the beacon for a length of time: Tsrch=Tbeacon+deltT1+deltT2 Equation 1

The Tsrch is the length of the detection window, that is, the length of time that the decoding module detects the beacon, that is, the length of time after the decoding module is awakened, and the length of time that the Tbeacon is the beacon.

deltT 1 is the decoding module startup time plus the forward protection time, and deltT2 is the backward protection time. The time required for the decoding module to start from the wake-up to the completion of the decoding module varies from terminal to terminal, and can be obtained by actual measurement; the front and back protection time is used to correct the count value to ensure the counter. After generating a small amount of drift, the decoding module can still be started before receiving the beacon, and the detection window can also contain the complete beacon in the case of drift, and the length can be determined according to system measurement or simulation, so deltT1 and deltT2 can be determined after the transmission system and the terminal are determined, and the two can be the same or different.

Therefore, in step D of the embodiment of the present invention, the terminal should wake up the decoding module when the Xth symbol starts in each time slot; if the beacon is not detected, the decoding is turned off at the beginning of the Yth symbol. Module. The time difference between the start time of the Xth symbol and the start time of the next beacon is greater than or equal to deltT1, and the time difference between the start time of the X+1th symbol and the start time of the next beacon is less than deltT1. The time difference between the start time of the Yth symbol and the last beacon end time is greater than or equal to deltT 2, the time difference between the start time of the Y-1th symbol and the last beacon end time It is less than deltT 2.

In practical applications, the terminal stores the symbol count value corresponding to the start time of the Xth symbol and the start time of the Yth symbol, and when the count value reaches the symbol count value corresponding to the start time of the Xth symbol, Then, the decoding module is turned on, and when the count value reaches the symbol count value corresponding to the start time of the Yth symbol, the decoding module is turned off.

Because it can be accurately positioned, Tsrch can be smaller than the length of the detection window in the prior art, and also saves power.

The implementation of the signal information by means of a timer or a timer is similar to that when the counter is used, and will not be described here.

E. The terminal enters a sleep state, and the beacon is periodically detected. The length of the detection window is greater than or equal to one time slot, and the detection interval is at least greater than the length of one time slot. When the beacon is detected, the process returns to step B.

The working mode of the terminal in this step is called the asynchronous power saving mode, as shown in Figure 3.

The detection interval described in the embodiment of the present invention is compromised according to the requirements of power saving and opening speed, for example, 3 seconds. When the beacon is detected, it indicates that the received signal can be received normally. At this time, the terminal resumes normal operation and returns to step B.

In practical applications, a simplified solution may be adopted: when the terminal normally receives the received signal, according to the received signal, a received signal information that changes synchronously with the received signal is set in the terminal, and when the terminal cannot receive the signal normally, step D is performed. After detecting the beacon, proceed to step C, and if the beacon is not detected, continue to step D. The above scheme of adding the asynchronous power saving mode is an improvement of the simplified scheme.

In order to facilitate the terminal or other network device to know which power-saving working mode is adopted by the terminal, a counting effective flag bit may be set, and the flag bit may be a temporary register, but is not limited thereto. When the terminal cannot receive the received signal normally, the status of the flag bit is first determined. If the logic is set to "1", the synchronous power saving mode is adopted, that is, the above step D, otherwise, the asynchronous power saving mode is adopted, that is, the above steps E; the flag bit is first cleared each time the terminal is turned on, and the flag bit is set to logic "1" whenever the signal can be normally received. In the specific step, the following processing may be added: in step A of the embodiment of the present invention, the flag bit is cleared after the terminal is turned on; when the signal cannot be received normally, the status of the flag bit is first queried. Since the flag bit is in the clear state (ie, logic "0"), step E is performed in the asynchronous power save mode. If the signal can be received normally, the flag bit is set to logic "1".

In the step C of the embodiment of the present invention, when a situation in which the received signal cannot be normally received occurs, the state of the flag bit is first queried, and since the flag bit is logical "1", the synchronization province is adopted. In the electrical mode, perform step D.

In step D of the embodiment of the present invention, after the beacon is detected, the count valid flag is set to logic "1"; if not detected, the status of the detected bit may be queried first, if Logic "1" continues with step D.

In step E of the embodiment of the present invention, after the beacon is detected, the count valid flag bit is set to logic "1".

The step D described in the embodiment of the present invention may specifically include the following steps: D1: When the terminal enters the sleep state, simultaneously reset and start a timer.

D2. The terminal determines the appearance time of the beacon according to the received signal information, and detects the beacon in the time. When the beacon is detected, step D3 is performed, otherwise the sleep is continued, and the process returns to step D2.

D3. The terminal resumes normal operation, stops the timer, and returns to step C.

In step D2, the terminal monitors the value of the timer. When it exceeds the set threshold T1, the timer is stopped, and the asynchronous power saving mode is entered, that is, step E is performed; if the counting valid flag is Bit, when the value of the timer exceeds the set threshold T1, the terminal first clears the counter valid flag bit, stops the timer, and then determines that the asynchronous power saving mode should be used according to the flag bit. , go to step E.

The purpose of this is that after the terminal runs in the synchronous power-saving mode for a certain period of time, the drift of the counter may cause the beacon to be out of the detection window. To ensure the detection of the beacon, the detection window is used instead of the more expensive The synchronous power saving mode works; the T1 is determined according to the accuracy of the system signal source, and may be 1 hour, but is not limited thereto.

The step D of the embodiment of the present invention may further include: the terminal monitors the received signal strength RSSI, and if the RSSI>the threshold value R1, enters the asynchronous power saving mode, that is, performs step E. If the counting effective flag bit is provided, when the RSSI>threshold value R1, the terminal first clears the counting effective flag bit, and then determines to use the asynchronous power saving mode according to the flag bit, and performs steps. E.

The purpose of this is to detect and protect the system, that is, when the signal strength is found to be within the range of normal reception, but the beacon cannot be detected, it means that the beacon is not detected for some reason, such as system restart. Within the window, it causes undetectable problems, and it is switched to the non-synchronous power-saving mode with long detection window but power consumption; R1 range can be -50dB to -80dB.

The invention further provides a power-saving mobile terminal, as shown in FIG. 4, comprising a decoding module and a control module.

The decoding module according to the embodiment of the present invention includes a receiving channel and a decoding circuit for receiving signals from a broadcast network.

The control module is configured to set a received signal information that is synchronously changed with the received signal according to the received signal when the decoding module normally receives the received signal, and turns off the decoding when the decoding module cannot receive the received signal normally. The module is further configured to determine the occurrence time of each beacon according to the received signal information when the decoding module is in the off state, to wake up the decoding module to detect the beacon.

The control module according to the embodiment of the present invention sets the received signal information that is synchronously changed with the received signal according to the received signal. The control module counts the symbol of the symbol synchronization in the received signal, and is zero when the count value reaches M+1. Start counting again.

The control module according to the embodiment of the present invention determines the occurrence time of each beacon according to the received signal information, and wakes up the decoding module to detect the beacon: the control module determines the occurrence of each beacon according to the symbol count value. Time, when the symbol count value reaches the count value corresponding to the start time of the Xth symbol, the decoding module is turned on, and when the symbol count value reaches the count value corresponding to the start time of the Yth symbol, the data is turned off. Decoding module. The selection method of the X and Y is the same as the selection method described above, and will not be repeated here.

The terminal according to an embodiment of the present invention further includes a counter.

The control module according to the embodiment of the present invention sets the received signal information according to the received signal, which means that the control module synchronizes the counter with the symbol of the actual received signal according to the signal received by the decoding module.

The control module according to the embodiment of the present invention synchronizes the counter with the symbol of the actual received signal, that is, the control module causes the counter to increment by one at the start time of each symbol, and the counter is countered when the count value reaches M+1. Returning to zero; the counter can also be counted from the time when the first symbol in the slot is received, and of course, it can be counted from any symbol received, but not limited thereto.

The control module according to the embodiment of the present invention determines the occurrence time of each beacon according to the received signal information, and wakes up the decoding module to detect the beacon: the start time of the Xth symbol is respectively saved in the control module a symbol count value corresponding to the start time of the Yth symbol; the control module queries the counter, and when the count value reaches the count value corresponding to the start time of the Xth symbol, the decoding module is turned on, and when the count value is When the count value corresponding to the start time of the Yth symbol is reached, the decoding module is turned off.

The terminal according to the embodiment of the present invention further includes a temporary storage device for indicating which power-saving working mode is adopted; it can be set to: when the value is logic "1", it indicates that the synchronous power saving operation is adopted. Mode; when its value is logic "0", it means that the non-synchronous power saving mode is adopted, but not limited to this.

The control module of the embodiment of the present invention can clear the temporary storage device after the terminal is turned on, and query the state of the temporary storage device when the decoding module is turned off. If the value is logic "1", the synchronization is performed. The power-saving working mode, that is, when the decoding module is in the off state, determining the occurrence time of each beacon according to the received signal information, so as to wake up the decoding module to detect the beacon; if the value is logic "0", proceed The non-synchronous power-saving working mode, that is, when the decoding module is in the off state, the decoding module is periodically woken up to detect the beacon, and the total length of the opening time is that the detection window length is greater than or equal to one time slot, and the detection interval is at least one time slot. The length may also be used to set the value of the register to logic "1" when the decoding module detects the received signal, and restore the decoding module to normal operation.

The terminal according to the embodiment of the present invention further includes a timer.

The control module of the embodiment of the present invention may also be used to start the timer and monitor the value of the timer when starting to operate according to the synchronous power saving mode, and when the controller exceeds the set threshold T1, stop the a timer, first clearing the register, and then determining whether to start working according to the non-synchronous power saving mode according to the state of the register; and further for stopping and weighing after detecting the beacon when working according to the synchronous power saving mode Set the timer. The T1 is the same as the T1 of the foregoing method embodiment, and details are not described herein again.

The control module according to the embodiment of the present invention may also be configured to monitor the received signal strength RSSI when operating according to the synchronous power saving mode, and if the RSSI>threshold value R1, first clear the register, and then according to the temporary The memory status determines whether to start working in the asynchronous power saving mode. The R1 is the same as the R1 of the foregoing method embodiment, and details are not described herein again.

As in the foregoing method embodiment, the control module according to the embodiment of the present invention can set a received signal information that is synchronously changed with the received signal in the terminal, and can also be implemented by using a timer or a timer. Let me repeat.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

Fig. 1 is a flow chart showing the specific implementation of the power saving method of the present invention.

Figure 2 is a schematic illustration of the synchronous mode of operation of the present invention.

Figure 3 is a schematic illustration of the asynchronous mode of operation in the present invention.

Figure 4 is a block diagram showing the specific implementation of the power-saving mobile terminal of the present invention.

Claims (17)

A power saving method, comprising: setting a received signal information that is changed in synchronization with a received signal at a terminal; and when the terminal cannot normally receive the received signal, causing the terminal to sleep; and in a sleep state And determining an occurrence time of a beacon in the received signal according to the received signal information, and detecting the beacon to determine a time when the received signal is normally received. The power saving method according to claim 1, further comprising the following steps: A. The terminal sets the received signal information that changes in synchronization with the received signal in the terminal according to the received signal; and performs step B; The terminal works normally. When the terminal cannot receive the signal normally, proceed to step C; C, the terminal enters the sleep state, and determines the occurrence time of each beacon according to the received signal information, to detect the beacon; When the beacon is detected, it returns to step B; if the beacon is not detected, then step C is continued. The power saving method of claim 2, wherein in step A, the terminal sets the received signal information according to the received signal, wherein the terminal counts symbols of symbol synchronization in the received signal, and Recounting from zero when the count value reaches M+1; the symbol includes orthogonal frequency department multiplex symbols and beacons; the value of M is the number of orthogonal frequency department multiplex symbols included in a time slot; In step C, the terminal enters the dormant state, that is, the terminal closes a decoding module; in step C, the terminal determines the occurrence time of each beacon according to the received signal information, to detect that the beacon refers to The terminal determines the appearance time of each beacon according to the symbol count value to wake up the decoding module to detect the beacon. The power saving method of claim 3, wherein in step C, the terminal determines the occurrence time of each beacon according to the symbol count value, to wake up the decoding module to detect the beacon: The terminal wakes up the decoding module when the Xth symbol starts in each time slot; if the beacon is not detected, the decoding module is turned off at the beginning of the Yth symbol; the start time of the Xth symbol is Between the beginning of the next beacon The time difference is greater than or equal to a first difference, and the time difference between the start time of the X+1th symbol and the start time of the next beacon is less than the first difference; the start time of the Yth symbol is The time difference between the end times of the last beacon is greater than or equal to a second difference, and the time difference between the start time of the Y-1th symbol and the end time of the last beacon is less than the second difference; The difference is the start time of the decoding module plus the forward protection time, and the second difference is the back protection time, and the front and back protection time is used to correct the count value. The power saving method according to any one of the preceding claims, wherein before the step A, the method further includes: opening the terminal, determining whether the terminal can normally receive the received signal, and if yes, executing Step A, otherwise step D is performed; after step C, the method further includes: D. The terminal enters the sleep state, and periodically detects the beacon. The length of the detection window is greater than or equal to one time slot, and the detection interval is at least greater than The length of a time slot, when it detects the beacon, it returns to step A. The power saving method described in claim 5 of the patent scope further includes: Setting a valid flag bit, when the terminal cannot receive the received signal normally, first determine the state of the flag bit. If the value of the flag bit is logic 1, proceed to step C, otherwise proceed to step D. The flag bit is first cleared each time the terminal is turned on, and the value of the flag bit is set to logic 1 whenever the received signal can be normally received. The power saving method of claim 5, wherein the step C further comprises: C1, the terminal enters the sleep state, and simultaneously resets and starts a timer. C2. The terminal determines the appearance time of the beacon according to the received signal information, and detects the beacon in the appearance time; when detecting the beacon, performs step C3, if the beacon is not detected, Continue to sleep, return to step C2; C3, the terminal resumes normal operation, stops the timer, and returns to step B; in step C2, the terminal monitors the value of the timer, when the value of the timer exceeds a set threshold value , then stop the controller and perform step D. The power saving method of claim 6, wherein the step C further comprises: C1, the terminal enters the sleep state, and simultaneously resets and starts a timer. C2. The terminal determines the appearance of the beacon according to the received signal information. Interrogating the beacon in the expiration time; when inquiring the beacon, performing step C3, if the beacon is not detected, continuing to sleep, returning to step C2; C3, the terminal resumes normal work, stops The timer returns to step B; in step C2, the terminal monitors the value of the timer, and when the value of the timer exceeds a set threshold, the timer is stopped, and the flag bit is The value is set to logic 1, and step D is performed. The power saving method of claim 5, wherein the step C further comprises: the terminal monitoring the received signal strength, and if the terminal monitors the received signal strength to be greater than a critical value, performing step D. The power saving method of claim 6, wherein the step C further comprises: the terminal monitoring the received signal strength, and if the terminal monitors the received signal strength to be greater than a threshold, the flag bit is The value is set to logic 1, and step D is performed. A power-saving mobile terminal comprising a decoding module for broadcasting from a broadcast Receiving a received signal in the network; and a control module; wherein the control module is configured to: when the receiving module receives the received signal normally, set and receive the received signal according to the received signal in the terminal a received signal information that is synchronously changed by the signal, when the decoding module cannot normally receive the received signal, the decoding module is turned off; and when the decoding module is in an off state, the received signal is determined according to the received signal information. The occurrence time of each beacon in the wake up the decoding module to detect the beacon to determine the time when the received signal is normally received. The mobile terminal of claim 11, wherein the mobile terminal further includes a counter; and the control module sets the received signal information according to the received signal to: the control module receives the received signal according to the decoding module. The signal synchronizes the counter with the sign of the actual received signal. The mobile terminal of claim 12, wherein the control module synchronizes the counter with the symbol of the actual received signal according to a signal received by the decoding module, the control is: at the beginning of each symbol, the control The module increments the counter value of the counter, and when the counter value of the counter reaches M+1, The counter is zeroed; the symbol includes an orthogonal frequency department multiplex symbol and a beacon; the value of M is a number of orthogonal frequency department multiplex symbols included in a time slot; the control module is based on the received signal information Determining the occurrence time of each beacon means that the terminal determines the occurrence time of each beacon based on the count value in the counter. The action terminal of claim 13, wherein the control module determines the occurrence time of each beacon according to the received signal information, and waking up the decoding module to detect the beacon means: the control The module stores a symbol count value corresponding to a start time of the Xth symbol and a start time of the Yth symbol respectively; the control module queries the counter, and when the count value of the counter reaches the start time of the Xth symbol, When the count value is turned on, the decoding module is turned on, and when the count value of the counter reaches the count value corresponding to the start time of the Yth symbol, the decoding module is turned off; the start time and the next time of the Xth symbol The time difference between the start times of the beacons is greater than or equal to a first difference value, and the time difference between the start time of the X+1th symbol and the start time of the next beacon is less than the first difference value; The time difference between the start time of the Yth symbol and the end time of the last beacon is greater than or equal to a second difference, and the time difference between the start time of the Y-1th symbol and the end time of the last beacon is The first difference is a start time of the decoding module plus a forward protection time, and the second difference is a back protection time, and the front and back protection time is used to correct the Count value. The mobile terminal according to any one of the preceding claims, wherein the mobile terminal further includes a temporary register; the control module is further configured to clear the temporary storage after the terminal is opened. And querying the state of the register when the decoding module is turned off. If the value of the register is logic 1, the synchronous power saving mode is performed, that is, according to the received signal when the decoding module is in the off state. The information is used to determine the occurrence time of each beacon to wake up the decoding module to detect the beacon; if the value of the register is logic 0, the asynchronous power saving operation mode is performed, that is, in the decoding module In the off state, the decoding module is periodically woken up to detect the beacon, and the total length of the opening time is that the length of the detection window is greater than or equal to one time slot, and the detection interval is at least greater than the length of one time slot; When the decoding module detects the received signal, the value of the register is set to logic 1, and the The decoding module resumes normal operation. The mobile terminal according to claim 15 , further comprising a timer; the control module is further configured to start the timer and monitor the value of the timer when starting to work according to the synchronous power saving mode. When the value of the timer exceeds a set threshold value, the timer is stopped, the register is first cleared, and then according to the state of the register, it is determined whether to start working according to the asynchronous power saving mode; and when the power is saved according to the synchronization When the mode is detected, the timer is stopped and reset after the beacon is detected. The mobile terminal according to claim 15, wherein the control module is further configured to monitor the strength of the received signal when operating according to the synchronous power saving mode, and if the strength of the received signal is greater than a critical value, The register is cleared, and then it is determined whether to start operating in the asynchronous power saving mode based on the state of the register.