CN108781430B - Paging method based on unlicensed spectrum and related equipment - Google Patents

Paging method based on unlicensed spectrum and related equipment Download PDF

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CN108781430B
CN108781430B CN201680083762.XA CN201680083762A CN108781430B CN 108781430 B CN108781430 B CN 108781430B CN 201680083762 A CN201680083762 A CN 201680083762A CN 108781430 B CN108781430 B CN 108781430B
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time
time length
duration
terminal device
terminal equipment
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CN108781430A (en
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于峰
温容慧
于光炜
张武荣
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Abstract

The embodiment of the invention discloses a paging method based on an unauthorized frequency spectrum and related equipment, wherein the method comprises the following steps: the terminal equipment calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, and starts timing when the terminal equipment enters the sleep state; when the timed duration reaches the target duration, entering an awakening state, and calculating a second duration which is away from the PO at the current time according to the frame information at the current time; the target time length is the difference value between the first time length and the preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; or when the second duration is less than the duration threshold, the interception state is continuously kept until the paging message is intercepted. By adopting the invention, the terminal equipment can be ensured to always sense the paging message in the unauthorized frequency spectrum.

Description

Paging method based on unlicensed spectrum and related equipment
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a paging method based on an unlicensed spectrum and a related device.
Background
The current paging method between the base station and the terminal device is generally as follows: the base station and the terminal device respectively calculate a PF (paging frame) and a PO (paging occasion) according to the terminal device identifier, DRX (discontinuous reception) and other information, the base station sends a paging message at the PO, and the terminal device intercepts the paging message at the PO.
In the authorized spectrum, the change of the frame number or the subframe number along with the time is continuous, because the base station or the terminal equipment always occupies the channel, the terminal equipment can judge the frame number and the subframe number of the current system according to the timer information even in an idle state. However, in the unlicensed spectrum, a node (base station or terminal) in the network cannot continuously occupy a channel all the time due to regulatory restrictions, and the base station may need to preempt the channel in a contention manner, that is, the base station may have an LBT (listen before Talk) duration, where the LBT duration specifically refers to a time for the base station or terminal device to preempt the channel each time the base station or terminal device listens before Talk in the unlicensed spectrum. When the base station does not occupy the channel (i.e., the base station is in the LBT duration), the base station does not transmit the system frame, and the base station continues to transmit the system frame only after preempting the channel again. Thus, in unlicensed spectrum, the system frame number may not be continuous over time.
For example, when an M2M (machine to machine) system is deployed on an unlicensed spectrum, the terminal device still uses a DRX mechanism due to the requirement of low power consumption, goes to sleep in an idle state for power saving, and wakes up at a PO time to listen to a paging message. However, when the LBT duration occurs, since the terminal device is in a sleep state and cannot recognize the LBT duration, the frame number and the subframe number maintained by the terminal device are still decremented according to the continuous time to be calculated, and the base station can know the existence of the LBT duration through channel detection, and the base station does not transmit the frame in the LBT duration, therefore, the frame number and the subframe number maintained by the base station are lagged by the existence of the LBT duration relative to the frame number and the subframe number maintained by the terminal device. The method comprises the steps that a terminal device wakes up at a PO (broadcast over coax) moment according to self-maintained time, the terminal device does not specially judge whether currently sent frame information is consistent with self-maintained system frame information after waking up, the terminal device is considered as consistent by default, and actually, due to the existence of LBT (local binary transmission) duration, the PO moment maintained by a base station does not arrive, so that the base station does not send a paging message at the moment, the terminal device listens for a period of time after waking up, and if the paging message is not intercepted, the terminal device considers that no paging message is sent, so that the paging is missed.
Disclosure of Invention
The embodiment of the invention provides a paging method based on an unlicensed spectrum and related equipment, which can ensure that terminal equipment can monitor paging messages sent by a base station every time in the unlicensed spectrum.
The invention provides a paging method based on an unlicensed spectrum in a first aspect, which comprises the following steps:
the terminal equipment calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, and starts timing when the terminal equipment enters the sleep state;
when the timed duration reaches the target duration, entering an awakening state, and calculating a second duration which is away from the PO at the current time according to the frame information at the current time; the target time length is the difference value between the first time length and the preset early awakening time length;
when the second time length is greater than a preset time length threshold value, taking the difference value between the second time length and a preset early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; alternatively, the first and second electrodes may be,
and when the second duration is less than the preset duration threshold, continuously keeping the interception state until the paging message sent by the base station at the PO is intercepted.
For example, when the LBT duration occurs in the terminal device in the sleep state, the wake-up time of the terminal device may be far from the pre-calculated PO, so that to avoid that the terminal device cannot sense the paging message, the terminal device may calculate the time length from the PO by acquiring the current frame information, and determine to continue to enter the sleep state or continuously maintain the listening state according to the calculated time length, thereby ensuring that the terminal device can sense the paging message sent by the base station.
In a first possible implementation, a terminal device calculates a paging frame PF and a paging occasion PO, calculates a first duration of the PO from a time when the terminal device enters a sleep state according to the PF and the PO, and starts timing when entering the sleep state, including:
the terminal equipment calculates PF and PO and acquires corresponding frame information in the first channel occupation time at the moment when the terminal equipment enters the sleep state;
determining corresponding frame information in the occupation time of a second channel where the PO is located according to the PF, the PO and the corresponding frame information in the occupation time of the first channel, and calculating a first duration between the corresponding frame information in the occupation time of the first channel and the corresponding frame information in the occupation time of the second channel;
and calculating a third duration between the PO and a preamble sequence of the second channel occupation time according to the frame information corresponding to the PO in the second channel occupation time, and starting timing when the PO enters a sleep state.
For example, assuming that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time when the sleep state is entered is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e., the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupying time (assuming that the frame number and the subframe number both start from 0), and the PO is the 4 th subframe of the second frame in the 12 th channel occupying time (i.e., the corresponding frame information in the second channel occupying time), so that the first time length T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time may be calculated as 11 (3 × 8+1) + T + (8+3+1) × T, where T is the time length of one subframe; and may calculate a third duration T1 ═ 8+3+1 × T between the PO and the preamble of the second channel occupation time (specifically, the start position of the preamble, and the length of one preamble is equal to the length of one subframe).
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, when the timed duration reaches the target duration, entering an awake state, and calculating a second duration from the current time to the PO according to the frame information of the current time, the method includes:
when the timed duration reaches the target duration, entering an awakening state, and detecting a preset advanced awakening duration;
when the preset early awakening time length is at least the time length required by the terminal equipment for discrete synchronization, determining the synchronization mode of the terminal equipment according to the third time length and the time length required by the terminal equipment for discrete synchronization;
synchronizing according to the determined synchronization mode, and after synchronization is completed, monitoring system information to acquire corresponding frame information in the occupation time of a third channel where the current time is;
and calculating a second duration between the corresponding frame information in the second channel occupation time and the corresponding frame information in the third channel occupation time.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner, determining a synchronization manner of the terminal device according to the third time duration and the time duration required by the terminal device to perform discrete synchronization includes:
judging whether the third time length is less than the time length required by the terminal equipment for discrete synchronization;
if the terminal equipment is judged to be in the continuous synchronization mode, determining the synchronization mode of the terminal equipment to be in the continuous synchronization mode;
otherwise, determining the synchronization mode of the terminal equipment as a discrete synchronization mode.
The terminal device can select the corresponding synchronization mode by judging the third time length and the time length required by the discrete synchronization, so that the selected synchronization mode can ensure that the terminal device does not miss PO due to overlong synchronization time, and further ensure that the terminal device can accurately intercept the paging message sent by the base station.
With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner, when the timed duration reaches the target duration, entering an awake state, and calculating a second duration from the current time to the PO according to the frame information of the current time, the method includes:
when the timed duration reaches the target duration, entering an awakening state, and detecting a preset advanced awakening duration;
when the preset early awakening time length is at least a third time length, synchronizing according to a continuous synchronization mode, and after synchronization is completed, monitoring system information to acquire corresponding frame information in the occupation time of a third channel where the current time is;
and calculating a second duration between the corresponding frame information in the second channel occupation time and the corresponding frame information in the third channel occupation time. The preset early wake-up duration is at least the third duration, and meanwhile, the synchronization duration of the terminal equipment and the duration of the interception system message can also be considered.
The terminal device determines that the preset early wake-up duration is at least the third duration, so that the synchronization mode can be always determined as the continuous synchronization mode, the terminal device can be ensured not to miss the PO due to the overlong synchronization time, and the terminal device can be further ensured to accurately intercept the paging message sent by the base station.
The second aspect of the present invention provides a paging method based on an unlicensed spectrum, including:
the base station calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, and starts timing when the terminal equipment enters the sleep state;
when the timed duration reaches the target duration and the base station successfully seizes the channel, sending a synchronization signal and acquiring a synchronization mode of the terminal equipment; the target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length of the terminal equipment in a sleep state;
and determining a time window for sending the paging message according to the synchronization mode, and sending the paging message to the terminal equipment in the time window.
Therefore, the base station is no longer fixed at the PO to send the paging message, but the time for sending the paging message is selected according to the actual awakening time of the terminal equipment and the synchronization duration of the terminal equipment, so that the terminal equipment can be ensured to listen to the paging message sent by the base station every time.
The specific process of the base station acquiring the synchronization mode of the terminal device may be as follows: and judging the preset early awakening time length according to a preset protocol or rule so as to determine the synchronization mode of the terminal equipment.
The terminal equipment can also calculate the PF and the PO, calculate the first duration of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, and start timing when the PO enters the sleep state, so that the terminal equipment can be awakened when the timed duration reaches the target duration.
In a first possible implementation manner, determining a time window for sending a paging message according to a synchronization manner, and sending the paging message to a terminal device within the time window includes:
when the acquired synchronization mode is a continuous synchronization mode, searching a preamble sequence preamble of the first channel occupied time after the terminal equipment enters an awakening state, setting a time window behind the preamble, and sending a paging message to the terminal equipment in the time window;
and when the acquired synchronization mode is the discrete synchronization mode, determining the synchronization success time of the terminal equipment according to the time length required by the terminal equipment for performing the discrete synchronization, setting a time window behind the synchronization success time, and sending a paging message to the terminal equipment in the time window.
A third aspect of the present invention provides a terminal device having a function of implementing the behavior of the terminal device in practice in the method of the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the structure of the terminal device includes a processor and a receiver, and the processor is configured to support the terminal device to perform corresponding functions in the method of the first aspect. The receiver is configured to support communication between the terminal device and the base station, and receive the paging message sent by the base station at the PO time. The terminal device may also include a memory for coupling with the processor that retains program instructions and data necessary for the terminal device.
A fourth aspect of the present invention provides a base station having functionality to implement the base station behaviour in practice of the method of the second aspect described above. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the base station includes a processor, a receiver, and a transmitter, and the processor is configured to support the base station to perform the corresponding functions in the method of the second aspect. The receiver and the transmitter are used for supporting communication between the base station and the terminal equipment, the transmitter is used for sending a synchronization signal and sending a paging message to the terminal equipment within a determined time window, and the receiver is used for receiving a synchronization mode of the terminal equipment. The base station may also include a memory, coupled to the processor, that retains program instructions and data necessary for the base station.
A fifth aspect of the present invention provides a paging system based on unlicensed spectrum, which includes a base station and a terminal device provided in the third aspect; the base station of the system is used for calculating PF and PO, calculating the position of PO according to PF and PO, and sending paging message at the position of PO.
A sixth aspect of the present invention provides another unlicensed spectrum based paging system, including a terminal device and the base station provided in the fourth aspect; the terminal device of the system is used for calculating a paging frame PF and a paging occasion PO, calculating a first duration of the PO from the time when the terminal device enters a sleep state according to the PF and the PO, starting timing when the terminal device enters the sleep state, entering a wake-up state when the timed duration reaches a target duration, and continuously keeping a monitoring state until a paging message sent by a base station is monitored.
The terminal equipment in the embodiment of the invention can calculate the first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, starts timing when the PO enters the sleep state, enters the awakening state when the timed time length reaches the target time length, and calculates the second time length of the PO from the current time according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted; therefore, after each awakening, the terminal equipment can calculate the time length from the PO by acquiring the current frame information, and determine to continuously enter the sleep state or continuously keep the interception state according to the calculated time length, so that the terminal equipment can be ensured to intercept the paging message sent by the base station in the unauthorized frequency spectrum each time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart illustrating a paging method based on unlicensed spectrum according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating another unlicensed spectrum based paging method according to an embodiment of the present invention;
fig. 2a is a schematic diagram of a paging mechanism of an unlicensed spectrum according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a paging method based on unlicensed spectrum according to another embodiment of the present invention;
fig. 4 is a flowchart illustrating a paging method based on unlicensed spectrum according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a paging system based on unlicensed spectrum according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another unlicensed spectrum based paging system according to an 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.
The terminal device according to the embodiments of the present invention may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. Terminal devices, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, for example, portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A Terminal device may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User agent (User agent), or a User Equipment (User Equipment).
Referring to fig. 1, a flowchart of a paging method based on unlicensed spectrum according to an embodiment of the present invention is shown, where the method includes:
s101, a terminal device calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from a time when the terminal device enters a sleep state according to the PF and the PO, and starts timing when the terminal device enters the sleep state;
specifically, the process of calculating the PF and the PO by the terminal device may be: the terminal device calculates the PF and the PO according to information such as the identifier of the terminal device and DRX, and the method for calculating the PF and the PO is the prior art and is not described herein again. The base station may also calculate the PF and the PO by the same method while the terminal device calculates the PF and the PO, and the base station may find the location of the PO according to the PF and the PO and send a paging message at the location of the PO.
After the terminal device obtains the PF and the PO, a first duration of a time when the PO is away from the terminal device and enters a sleep state may be calculated according to the PF and the PO. For example, assuming that there are 3 frames in a channel occupation time, each frame has 8 subframes, the calculated PF is 34, PO is 3, and the time of entering the sleep state is subframe 0 of frame 0 of channel occupation time 0, then PF is the second frame in 12 th channel occupation time (assuming that frame number and subframe number are both from 0), then PO is subframe 4 (subframe 3, that is, PO is 3) of the second frame in 12 th channel occupation time, the time interval between PO and the time of entering the sleep time is the first time length T ═ 11 × (3 × 8+1) × (8+3+1) × (T), T is the time length of one subframe.
S102, when the timed duration reaches the target duration, entering an awakening state, and calculating a second duration between the current time and the PO according to the frame information of the current time;
specifically, the target time length is a difference between the first time length and a preset early wake-up time length. When the time length counted by the terminal device reaches the target time length, the terminal device is awakened and is in an awakening state, if the terminal device after awakening is not in the LBT duration, the terminal device may immediately perform synchronization in a corresponding synchronization manner, acquire frame information corresponding to the channel occupation time at the current time after synchronization, and calculate a second time length from the current time to the PO according to the frame information at the current time, where the method for calculating the second time length may be referred to above S101, and is not described here again. If the awakened terminal device is in the LBT duration, the terminal device needs to wait for the end of the LBT duration, starts to synchronize in a corresponding synchronization mode when encountering a first preamble sequence, acquires frame information corresponding to the channel occupation time at the current time after synchronization, and calculates a second time length between the current time and the PO according to the frame information at the current time.
S103, when the second time length is greater than a preset time length threshold value, taking the difference value between the second time length and the preset early awakening time length as a new target time length, and continuing to enter the sleep state and start timing;
specifically, when the second duration is greater than a preset duration threshold, taking a difference between the second duration and the preset early wake-up duration as a new target duration, and continuing to enter the sleep state and start timing, that is, performing a cycle operation between S102 and S103 until the second duration is less than the preset duration threshold.
S104, when the second duration is smaller than the preset duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted;
specifically, the step S104 is parallel to the step S103, that is, when the second duration is less than the preset duration threshold, the step S103 is not executed any more, but the terminal device keeps the listening state continuously until the paging message sent by the base station at the PO is listened to. Since the terminal device can calculate the time interval between the current moment and the PO maintained by the base station after being awakened to determine whether the paging message needs to be intercepted, the terminal device can be ensured to intercept the paging message again when approaching the PO, so as to ensure that the terminal device does not miss the paging message because the paging message cannot be intercepted.
The terminal equipment in the embodiment of the invention can calculate the first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, starts timing when the PO enters the sleep state, enters the awakening state when the timed time length reaches the target time length, and calculates the second time length of the PO from the current time according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted; therefore, after each awakening, the terminal equipment can calculate the time length from the PO by acquiring the current frame information, and determine to continuously enter the sleep state or continuously keep the interception state according to the calculated time length, so that the terminal equipment can be ensured to intercept the paging message sent by the base station in the unauthorized frequency spectrum each time.
Referring to fig. 2 again, it is a flowchart of another unlicensed spectrum based paging method according to an embodiment of the present invention, where the method includes:
s201, the terminal device calculates the PF and the PO, and acquires corresponding frame information in a first channel occupation time at a moment when the terminal device enters a sleep state;
specifically, the process of calculating the PF and the PO by the terminal device may be: the terminal device calculates the PF and the PO according to information such as the identifier of the terminal device and DRX, and the method for calculating the PF and the PO is the prior art and is not described herein again. The base station may also calculate the PF and the PO by the same method while the terminal device calculates the PF and the PO, and the base station may find the location of the PO according to the PF and the PO and send a paging message at the location of the PO.
After the terminal device obtains the PF and the PO, it may further obtain frame information corresponding to the first channel occupation time at which the terminal device enters the sleep state, for example, the terminal device may obtain the subframe No. 3 of the frame No. 0 in which the frame information corresponding to the first channel occupation time is the channel occupation time No. 2.
S202, according to the PF, the PO and the corresponding frame information in the first channel occupation time, determining the corresponding frame information in the second channel occupation time of the PO, and calculating a first time length between the corresponding frame information in the first channel occupation time and the corresponding frame information in the second channel occupation time;
specifically, the terminal device further determines frame information corresponding to the second channel occupation time of the PO according to the PF, the PO and the frame information corresponding to the first channel occupation time, and calculates a first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time. For example, assume that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupancy time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupancy time (i.e., the corresponding frame information in the second channel occupancy time), and therefore, a first duration T of 11 × (3 × 8+1) × (8+3+1) × T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time may be calculated, where T is a duration of one subframe.
S203, according to the frame information corresponding to the second channel occupation time of the PO, calculating a third time length between the PO and a preamble sequence of the second channel occupation time, and starting timing when entering the sleep state;
specifically, the terminal device may further calculate, according to frame information corresponding to the second channel occupation time in which the PO is located, a third duration between the PO and a preamble sequence preamble of the second channel occupation time (i.e., a start position of the second channel occupation time), and start timing when entering the sleep state. For example, assuming that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time when the sleep state is entered is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupying time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupying time (i.e. the corresponding frame information in the second channel occupying time), and the third time period T1 between the PO and the preamble of the second channel occupying time (specifically, the starting position of the preamble, the length of one preamble is equal to the length of one subframe) is (8+3+1) × T.
S204, when the timed duration reaches the target duration, entering an awakening state, and detecting the preset early awakening duration;
specifically, when the time length counted by the terminal device reaches the target time length, the terminal device is awakened and is in an awakening state, and the preset advanced awakening time length is detected. And the target time length is the difference value between the first time length and the preset early awakening time length.
S205, when the preset early wake-up time is at least the time length required by the terminal equipment for discrete synchronization, determining the synchronization mode of the terminal equipment according to the third time length and the time length required by the terminal equipment for discrete synchronization;
specifically, when it is detected that the preset early wake-up duration is at least the duration required by the terminal device when performing discrete synchronization, the terminal device further determines the synchronization mode of the terminal device according to the third duration and the duration required by the terminal device when performing discrete synchronization, and the specific process of determining the synchronization mode may be: judging whether the third time length is less than the time length required by the terminal equipment for discrete synchronization; if the terminal equipment is judged to be in the continuous synchronization mode, determining the synchronization mode of the terminal equipment to be in the continuous synchronization mode; otherwise, determining the synchronization mode of the terminal equipment as a discrete synchronization mode. The time length required for the terminal device to perform discrete synchronization may be broadcast by the base station or specified by a protocol.
Further, please refer to fig. 2a, which is a schematic diagram of a paging mechanism of an unlicensed spectrum according to an embodiment of the present invention; the position of the PO in fig. 2a is pre-calculated by the terminal device and the base station, the COD in fig. 2a refers to the channel occupation time of the PO, and the time for listening to the paging message, which is recognized by the terminal device, is at the PO because of the LBT Duration (i.e., LBT Duration)UEThe position of the terminal device, therefore, the first duration is from the time the terminal device enters the sleep state to the POUEThe time interval in between. T1 in fig. 2a is an interval duration of the PO from a start position (preamble) of a channel occupation time of the PO; t2 is the time length required by the terminal device to perform discrete synchronization, and it can be known from fig. 2a that T1 is greater than T2, so that the synchronization mode determined by the terminal device corresponding to fig. 2a is a discrete synchronization mode; t3 is the preset early wake-up duration, i.e. T3 is relative to POUEAs can be seen from fig. 2a, the terminal device corresponding to fig. 2a wakes up in the LBT duration, and therefore, the terminal device starts discrete synchronization after the LBT duration is over and when the preamble is encountered.
S206, synchronizing according to the determined synchronization mode, and after synchronization is completed, monitoring system information to acquire corresponding frame information in the occupation time of a third channel where the current time is;
specifically, if the awakened terminal device is not in the LBT duration, the terminal device may immediately perform synchronization in the determined synchronization manner, and after the synchronization is completed, listen to a system message to obtain frame information corresponding to the third channel occupation time in which the current time is located. If the awakened terminal device is in the LBT duration, the terminal device needs to wait for the end of the LBT duration, starts to synchronize in the determined synchronization mode when encountering the first preamble, and listens to a system message after synchronization is completed so as to obtain the corresponding frame information in the third channel occupation time of the current time.
S207, calculating a second duration between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time;
specifically, the process of calculating the second duration between the frame information corresponding to the second channel occupying time and the frame information corresponding to the third channel occupying time may refer to the above S202, and is not described herein again.
S208, when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the preset early awakening time length as a new target time length, and continuing to enter the sleep state and start timing;
specifically, when the second duration is greater than a preset duration threshold, taking a difference between the second duration and the preset early wake-up duration as a new target duration, and continuing to enter the sleep state and start timing, that is, performing a cycle operation between S204 and S208 until the second duration is less than the preset duration threshold.
S209, when the second duration is less than the preset duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted;
specifically, the step S209 is parallel to the step S208, that is, when the second duration is smaller than the preset duration threshold, the step S208 is not executed any more, but the terminal device keeps the listening state until the paging message sent by the base station at the PO is listened to. Since the terminal device can calculate the time interval between the current moment and the PO maintained by the base station after being awakened to determine whether the paging message needs to be intercepted, the terminal device can be ensured to intercept the paging message again when approaching the PO, so as to ensure that the terminal device does not miss the paging message because the paging message cannot be intercepted.
The terminal equipment in the embodiment of the invention can calculate the first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, starts timing when the PO enters the sleep state, enters the awakening state when the timed time length reaches the target time length, and calculates the second time length of the PO from the current time according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted; therefore, after each awakening, the terminal equipment can calculate the time length from the PO by acquiring the current frame information, and determine to continuously enter the sleep state or continuously keep the interception state according to the calculated time length, so that the terminal equipment can be ensured to intercept the paging message sent by the base station in the unauthorized frequency spectrum each time; and the synchronization mode which should be used by the terminal equipment can be determined by judging the size between the third time length and the time length required by the terminal equipment for discrete synchronization, so that the PO missing caused by overlong synchronization time is avoided, and the terminal equipment is further ensured to accurately intercept the paging message sent by the base station.
Referring to fig. 3, it is a flowchart of another unlicensed spectrum based paging method according to an embodiment of the present invention, where the method includes:
s301, the terminal device calculates the PF and the PO, and acquires corresponding frame information in a first channel occupation time at a moment when the terminal device enters a sleep state;
s302, according to the PF, the PO and the corresponding frame information in the first channel occupation time, determining the corresponding frame information in the second channel occupation time of the PO, and calculating a first time length between the corresponding frame information in the first channel occupation time and the corresponding frame information in the second channel occupation time;
s303, calculating a third duration between the PO and a preamble sequence of the second channel occupation time according to the frame information corresponding to the PO in the second channel occupation time, and starting timing when entering the sleep state;
for specific implementation of steps S301 to S303, reference may be made to steps S201 to S203 in the embodiment corresponding to fig. 2, which is not described herein again.
S304, when the timed duration reaches the target duration, entering an awakening state, and detecting the preset early awakening duration;
specifically, when the time length counted by the terminal device reaches the target time length, the terminal device is awakened and is in an awakening state, and the preset advanced awakening time length is detected. And the target time length is the difference value between the first time length and a preset early awakening time length.
S305, when the preset early awakening time length is at least the third time length, synchronizing according to a continuous synchronization mode, and after synchronization is completed, monitoring system information to obtain corresponding frame information in the third channel occupation time of the current time;
specifically, when it is detected that the preset early wake-up duration is at least the third duration, the terminal device will always synchronize according to a continuous synchronization manner, and after synchronization is completed, listen to a system message to obtain frame information corresponding to the third channel occupation time at the current time. And when the preset early awakening time length is at least the third time length, the synchronization time length, the time length of monitoring the system message and other factors needing to be awakened in advance can be considered.
S306, calculating a second duration between the corresponding frame information in the second channel occupation time and the corresponding frame information in the third channel occupation time;
specifically, the process of calculating the second duration between the frame information corresponding to the second channel occupying time and the frame information corresponding to the third channel occupying time may refer to the above S302, and is not described herein again.
S307, when the second time length is greater than a preset time length threshold, taking a difference value between the second time length and the preset early awakening time length as a new target time length, and continuing to enter the sleep state and start timing;
specifically, when the second duration is greater than a preset duration threshold, taking a difference between the second duration and the preset early wake-up duration as a new target duration, and continuing to enter the sleep state and start timing, that is, performing a cycle operation between S304 and S307 until the second duration is less than the preset duration threshold.
S308, when the second duration is smaller than the preset duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted;
specifically, the step S208 is parallel to the step S307, that is, when the second duration is smaller than the preset duration threshold, the step S307 is not executed, and the terminal device continuously maintains the listening state until the paging message sent by the base station in the PO is listened to. Since the terminal device can calculate the time interval between the current moment and the PO maintained by the base station after being awakened to determine whether the paging message needs to be intercepted, the terminal device can be ensured to intercept the paging message again when approaching the PO, so as to ensure that the terminal device does not miss the paging message because the paging message cannot be intercepted.
The terminal equipment in the embodiment of the invention can calculate the first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, starts timing when the PO enters the sleep state, enters the awakening state when the timed time length reaches the target time length, and calculates the second time length of the PO from the current time according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted; therefore, after each awakening, the terminal equipment can calculate the time length from the PO by acquiring the current frame information, and determine to continuously enter the sleep state or continuously keep the interception state according to the calculated time length, so that the terminal equipment can be ensured to intercept the paging message sent by the base station in the unauthorized frequency spectrum each time; and the early awakening time length is set to be at least the third time length, and the synchronization is always carried out in a continuous synchronization mode, so that the condition that PO is missed due to overlong synchronization time is avoided, and the condition that the terminal equipment can accurately monitor the paging message sent by the base station is further ensured.
Please refer to fig. 4, which is a flowchart illustrating a paging method based on unlicensed spectrum according to another embodiment of the present invention, where the method includes:
s401, a base station calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from a time when a terminal device enters a sleep state according to the PF and the PO, and starts timing when the terminal device enters the sleep state;
specifically, the process of the base station calculating the PF and the PO may be: the base station calculates the PF and the PO according to information such as the identifier of the terminal device and DRX, and the method of calculating the PF and the PO is the prior art and is not described herein again. The base station calculates the PF and the PO, and meanwhile, the terminal device may also calculate the PF and the PO by the same method, and the base station and the terminal device may calculate a first duration of a time when the PO is distant from the terminal device to enter a sleep state according to the PF and the PO, respectively, and start timing when the terminal device enters the sleep state.
The specific process of calculating the first duration may be: acquiring frame information corresponding to first channel occupation time at the moment when the terminal equipment enters the sleep state, determining frame information corresponding to second channel occupation time of the PO according to the PF, the PO and the frame information corresponding to the first channel occupation time, and calculating a first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time. For example, assume that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupancy time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupancy time (i.e., the corresponding frame information in the second channel occupancy time), and therefore, a first duration T of 11 × (3 × 8+1) × (8+3+1) × T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time may be calculated, where T is a duration of one subframe.
S402, when the timed duration reaches the target duration and the base station successfully occupies the channel, sending a synchronization signal and acquiring the synchronization mode of the terminal equipment;
specifically, when the timed duration reaches the target duration and the base station successfully seizes the channel, the base station sends a synchronization signal and acquires the synchronization mode of the terminal device. The target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length when the terminal device is in a sleep state, namely, the terminal device starts to time when entering the sleep state and is awakened when the timed time length reaches the target time length. Wherein, the base station may perform uplink operation and/or downlink operation in the prior art while transmitting the synchronization signal, which is not described herein again.
Further, a specific process of the base station acquiring the synchronization mode of the terminal device may be: and judging the preset early awakening time length according to a preset protocol or rule so as to determine the synchronization mode of the terminal equipment. The protocol or rule for judging the preset early wake-up duration may be: if the preset early awakening time length is greater than or equal to a time length T2 required by the terminal equipment for discrete synchronization, judging whether a time length T1 of the PO from the initial position of the occupied time of the channel where the PO is located is less than T2, if so, determining that the synchronization mode is a continuous synchronization mode, otherwise, determining that the synchronization mode is a discrete synchronization mode; or may be: if the preset early awakening time length is greater than or equal to T1, determining that the synchronization mode is a continuous synchronization mode, if the preset early awakening time length is less than T1, further judging whether the preset early awakening time length is greater than or equal to T2, if judging that the preset early awakening time length is greater than or equal to T2 (indicating that T1 is greater than T2), determining that the synchronization mode is a discrete synchronization mode, and if judging that the preset early awakening time length is less than T2, determining that the synchronization of the terminal equipment fails. The protocol or rule for judging the preset early wake-up time in the invention can also be in other forms (only the terminal device is ensured not to miss synchronization), and the details are not repeated here.
S403, determining a time window for sending the paging message according to the synchronization mode, and sending the paging message to the terminal equipment in the time window;
specifically, when the synchronization mode is a continuous synchronization mode, searching for a preamble of a first channel occupation time after the terminal device enters an awake state, setting a time window behind the preamble, and sending the paging message to the terminal device in the time window; when the synchronization mode is the discrete synchronization mode, determining a synchronization success time of the terminal device according to a time length required by the terminal device for discrete synchronization, setting a time window after the synchronization success time, and sending the paging message to the terminal device within the time window, for example, when the synchronization mode is the discrete synchronization mode, obtaining a time length T2 required by the terminal device for discrete synchronization, and the base station may set the time window after the time length T2. The base station selects the time for sending the paging message according to the actual awakening time of the terminal equipment and the synchronization duration of the terminal equipment, so that the terminal equipment can be ensured to sense the paging message sent by the base station every time.
When the timed duration reaches the target duration and the base station successfully occupies the channel, the base station synchronizes with the terminal equipment in the awakening state, acquires the synchronization mode of the terminal equipment, determines a time window for sending the paging message according to the synchronization mode and sends the paging message to the terminal equipment in the time window; therefore, the base station selects the time for sending the paging message according to the actual awakening time of the terminal equipment and the synchronization duration of the terminal equipment, so that the terminal equipment can be ensured to listen to the paging message sent by the base station every time.
Please refer to fig. 5, which is a schematic structural diagram of a terminal device according to an embodiment of the present invention, where the terminal device 1 may include: a receiving module 11 and a processing module 12; the terminal device 1 is configured to perform the unlicensed spectrum based paging method shown in fig. 1 to 3.
The processing module 12 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first time length of the PO from a time when the terminal device 1 enters a sleep state according to the PF and the PO, and start timing when entering the sleep state;
specifically, the process of calculating the PF and the PO by the processing module 12 may be: the processing module 12 calculates the PF and the PO according to the information such as the identifier of the terminal device 1 and DRX, and the method for calculating the PF and the PO is the prior art and is not described herein again. While the processing module 12 calculates the PF and the PO, the base station may also calculate the PF and the PO by the same method, and the base station may find the position of the PO according to the PF and the PO and send a paging message at the position of the PO.
After the processing module 12 obtains the PF and the PO, a first duration of a time when the PO is away from the terminal device 1 and enters the sleep state may be calculated according to the PF and the PO. For example, assuming that there are 3 frames in a channel occupation time, each frame has 8 subframes, the calculated PF is 34, PO is 3, and the time of entering the sleep state is subframe 0 of frame 0 of channel occupation time 0, the PF is the second frame in the 12 th channel occupation time (assuming that the frame number and the subframe number both start from 0), and PO is subframe 4 (subframe 3, that is, PO is 3) of the second frame in the 12 th channel occupation time, the first calculation module may calculate the time interval between PO and the time of entering the sleep time to be the first time length T ═ 11 (3 × 8+1) × T + (8+3+1) × T, where T is the time length of one subframe.
The processing module 12 is configured to enter an awake state when the timed duration reaches a target duration, and calculate a second duration between the current time and the PO according to frame information of the current time; the target time length is the difference value between the first time length and a preset early awakening time length;
specifically, the target time length is a difference between the first time length and a preset early wake-up time length. When the time length counted by the processing module 12 reaches the target time length, the terminal device 1 is awakened and is in an awakening state, if the terminal device 1 after awakening is not in the LBT duration, the processing module 12 may immediately synchronize in a corresponding synchronization manner, acquire frame information corresponding to the channel occupation time at the current time after synchronization, and calculate a second time length from the current time to the PO according to the frame information at the current time, where a method of calculating the second time length is the same as a method of calculating the first time length by the first calculating module, and details are not repeated here. If the awakened terminal device 1 is in the LBT duration, the processing module 12 needs to wait for the end of the LBT duration, and starts to synchronize in a corresponding synchronization manner when encountering the first preamble sequence, and obtains the frame information corresponding to the channel occupation time at the current time after synchronization, and calculates the second duration between the current time and the PO according to the frame information at the current time.
The processing module 12 is configured to, when the second duration is greater than a preset duration threshold, use a difference between the second duration and the preset early wake-up duration as a new target duration, and continue to enter the sleep state and start timing;
specifically, when the second duration is greater than the preset duration threshold, the processing module 12 uses a difference between the second duration and the preset early wake-up duration as a new target duration, and continues to enter the sleep state and start timing, that is, performs a loop operation between the second calculating module and the determination notifying module until the second duration is less than the preset duration threshold.
The receiving module 11 is configured to, when the second duration is smaller than the preset duration threshold, continuously maintain the listening state until a paging message sent by the base station in the PO is listened to;
specifically, when the second duration is less than the preset duration threshold, the processing module 12 does not continue to enter the sleep state and start timing, but the receiving module 11 continuously maintains the listening state until the paging message sent by the base station in the PO is listened to. Since the terminal device 1 can calculate the time interval between the current time and the PO maintained by the base station after being awakened to determine whether to listen to the paging message at this time, it can be ensured that the terminal device 1 determines to listen to the paging message again when approaching the PO, so as to ensure that the terminal device 1 does not miss the paging message because the paging message cannot be listened to.
Further, the processing module 12 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first duration of the time when the PO is away from the time when the terminal device 1 enters the sleep state according to the PF and the PO acquired by the receiving module 11, and start timing when the terminal device enters the sleep state, and specifically include:
calculating the PF and the PO, acquiring frame information corresponding to first channel occupation time at the moment when the terminal device 1 enters a sleep state, determining frame information corresponding to second channel occupation time of the PO according to the PF, the PO and the frame information corresponding to the first channel occupation time, calculating a first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time, calculating a third duration between the PO and a preamble sequence preamble of the second channel occupation time according to the frame information corresponding to the second channel occupation time of the PO, and starting timing when the terminal device enters the sleep state.
Specifically, after the processing module 12 calculates the PF and the PO, the processing module 12 may further obtain frame information corresponding to the first channel occupation time at which the terminal device 1 enters the sleep state, for example, the processing module 12 may obtain the subframe 3 of the frame 0 whose frame information corresponding to the first channel occupation time is the channel occupation time No. 2.
For example, assuming that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, and the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the processing module 12 may determine that the PF is the second frame in the 12 th channel occupying time (assuming that the frame number and the subframe number both start from 0), and determine that the PO is the 4 th subframe of the second frame in the 12 th channel occupying time (i.e. the corresponding frame information in the second channel occupying time), and therefore, the determination calculating unit may calculate the first time length T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time to be 11 (3 × 8+1) ± (8+3+1) /), t is the duration of one subframe.
The processing module 12 may calculate a third duration between the PO and a preamble sequence preamble of the second channel occupation time (i.e., an initial position of the second channel occupation time) according to frame information corresponding to the PO in the second channel occupation time, and start timing when entering the sleep state. For example, assuming that PF is the second frame in the 12 th channel occupying time (assuming that the frame number and the subframe number both start from 0), and PO is the 4 th subframe of the second frame in the 12 th channel occupying time (i.e. the corresponding frame information in the second channel occupying time), the processing module 12 may calculate the third time duration T1 (8+3+1) × T between the preamble (specifically, the starting position of the preamble, the length of one preamble is equal to the length of one subframe) of the PO from the second channel occupying time.
Further, the processing module 12 is configured to calculate a second duration from the current time to the PO according to the frame information of the current time, and specifically includes:
when the preset early awakening time length is at least the time length required by the terminal equipment 1 to perform discrete synchronization, determining the synchronization mode of the terminal equipment 1 according to the third time length and the time length required by the terminal equipment 1 to perform discrete synchronization, synchronizing according to the determined synchronization mode, after synchronization is completed, monitoring system information, acquiring frame information corresponding to the third channel occupation time of the current time, and calculating a second time length between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time. The target time length is a difference value between the first time length and a preset early awakening time length; the time length required for the terminal 1 to perform discrete synchronization may be broadcast by the base station or specified by a protocol.
Further, the processing module 12 is configured to determine a synchronization mode of the terminal device 1 according to the third time length and the time length required by the terminal device 1 to perform discrete synchronization, and specifically includes:
and judging whether the third time length is less than the time length required by the terminal equipment 1 for discrete synchronization, if so, determining that the synchronization mode of the terminal equipment 1 is a continuous synchronization mode, and if not, determining that the synchronization mode of the terminal equipment 1 is a discrete synchronization mode.
Further, the processing module 12 is configured to calculate, according to the frame information of the current time, a second time length between the current time and the PO, and specifically includes:
and when the preset early awakening time length is at least the third time length, synchronizing according to a continuous synchronization mode, after synchronization is completed, intercepting system information to acquire frame information corresponding to the third channel occupation time of the current time, and calculating a second time length between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
And when the preset early awakening time length is at least the third time length, the synchronization time length, the time length of monitoring the system message and other factors needing to be awakened in advance can be considered.
The receiving module 11 in the embodiment corresponding to fig. 5 may be a receiver of the entity device (terminal device 1), and the processing module 12 may be a processor of the entity device (terminal device 1).
The terminal equipment in the embodiment of the invention can calculate the first time length of the PO from the time when the terminal equipment enters the sleep state according to the PF and the PO, starts timing when the PO enters the sleep state, enters the awakening state when the timed time length reaches the target time length, and calculates the second time length of the PO from the current time according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted; therefore, after each awakening, the terminal equipment can calculate the time length from the PO by acquiring the current frame information, and determine to continuously enter the sleep state or continuously keep the interception state according to the calculated time length, so that the terminal equipment can be ensured to intercept the paging message sent by the base station in the unauthorized frequency spectrum each time; and the synchronization mode which should be used by the terminal equipment can be determined by judging the size between the third time length and the time length required by the terminal equipment for discrete synchronization, so that the PO missing caused by overlong synchronization time is avoided, and the terminal equipment is further ensured to accurately intercept the paging message sent by the base station.
Please refer to fig. 6, which is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station 2 may include: a processing module 21, a transmitting module 23, a receiving module 22; the base station 2 is configured to perform the unlicensed spectrum based paging method shown in fig. 4.
The processing module 21 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first duration of the PO from a time when the terminal device enters a sleep state according to the PF and the PO, and start timing when the terminal device enters the sleep state;
specifically, the process of calculating the PF and the PO by the processing module 21 may be: the PF and the PO are calculated according to the information such as the identifier of the terminal device and DRX, and the method of calculating the PF and the PO is the prior art and is not described herein again. While the processing module 21 calculates the PF and the PO, the terminal device may also calculate the PF and the PO by the same method, and the processing module 21 and the terminal device may calculate a first duration of a time when the PO is away from the terminal device to enter a sleep state according to the PF and the PO, respectively, and start timing when the terminal device enters the sleep state.
The specific process of calculating the first duration by the processing module 21 may be: acquiring frame information corresponding to first channel occupation time at the moment when the terminal equipment enters the sleep state, determining frame information corresponding to second channel occupation time of the PO according to the PF, the PO and the frame information corresponding to the first channel occupation time, and calculating a first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time. For example, assuming that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupying time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupying time (i.e. the corresponding frame information in the second channel occupying time), and therefore, the processing module 21 may calculate the first time length T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time to be 11 (3 + 8) × T + (8+3+1) × T, t is the duration of one subframe.
The sending module 23 is configured to send a synchronization signal when the duration counted by the processing module 21 reaches a target duration and a channel is successfully preempted; the target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length of the terminal equipment in a sleep state;
specifically, when the timed duration reaches the target duration and the base station 2 has successfully preempted the channel, the sending module 23 sends the synchronization signal. The target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length when the terminal device is in a sleep state, namely, the terminal device starts to time when entering the sleep state and is awakened when the timed time length reaches the target time length. The sending module 23 may also perform uplink operation and/or downlink operation in the prior art while sending the synchronization signal, which is not described herein again.
The receiving module 22 is configured to obtain a synchronization mode of the terminal device after the sending module 23 sends the synchronization signal;
specifically, the specific process of the receiving module 22 acquiring the synchronization mode of the terminal device may be: and judging the preset early awakening time length according to a preset protocol or rule so as to determine the synchronization mode of the terminal equipment. The protocol or rule for judging the preset early wake-up duration may be: if the preset early awakening time length is greater than or equal to a time length T2 required by the terminal equipment for discrete synchronization, judging whether a time length T1 of the PO from the initial position of the occupied time of the channel where the PO is located is less than T2, if so, determining that the synchronization mode is a continuous synchronization mode, otherwise, determining that the synchronization mode is a discrete synchronization mode; or may be: if the preset early awakening time length is greater than or equal to T1, determining that the synchronization mode is a continuous synchronization mode, if the preset early awakening time length is less than T1, further judging whether the preset early awakening time length is greater than or equal to T2, if judging that the preset early awakening time length is greater than or equal to T2 (indicating that T1 is greater than T2), determining that the synchronization mode is a discrete synchronization mode, and if judging that the preset early awakening time length is less than T2, determining that the synchronization of the terminal equipment fails. The protocol or rule for judging the preset early wake-up time in the invention can also be in other forms (only the terminal device is ensured not to miss synchronization), and the details are not repeated here.
The processing module 21 is configured to determine a time window for sending a paging message according to the synchronization mode obtained by the receiving module 22;
specifically, the processing module 21 is specifically configured to, when it is obtained that the synchronization mode is a continuous synchronization mode, search a preamble sequence preamble of a first channel occupation time after the terminal device enters an awake state, and set a time window behind the preamble; or, the processing module 21 is specifically configured to, when it is obtained that the synchronization mode is the discrete synchronization mode, determine a synchronization success time of the terminal device according to a time length required for performing discrete synchronization by the terminal device, and set a time window after the synchronization success time.
The sending module 23 is configured to send the paging message to the terminal device in the time window determined by the processing module 21.
The receiving module 22 in the embodiment corresponding to fig. 6 may be a receiver of the physical device (base station 2), the sending module 23 may be a transmitter of the physical device (base station 2), and the processing module 21 may be a processor of the physical device (base station 2).
When the timed duration reaches the target duration and the base station 2 successfully occupies the channel, synchronizing with the terminal equipment in the awakening state, acquiring the synchronization mode of the terminal equipment, determining a time window for sending the paging message according to the synchronization mode, and sending the paging message to the terminal equipment in the time window; therefore, the base station selects the time for sending the paging message according to the actual awakening time of the terminal equipment and the synchronization duration of the terminal equipment, so that the terminal equipment can be ensured to listen to the paging message sent by the base station every time.
Fig. 7 is a schematic structural diagram of a paging system based on unlicensed spectrum according to an embodiment of the present invention, where the system includes: a terminal device 100 and a base station 200;
the terminal device 100 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first time length of the PO from a time when the terminal device 100 enters a sleep state according to the PF and the PO, and start timing when the terminal device enters the sleep state;
the terminal device 100 is further configured to enter an awake state when the timed duration reaches a target duration, and calculate a second duration between the current time and the PO according to frame information of the current time; the target time length is the difference value between the first time length and a preset early awakening time length;
the terminal device 100 is further configured to, when the second duration is greater than a preset duration threshold, use a difference between the second duration and the preset early wake-up duration as a new target duration, and continue to enter the sleep state and start timing;
the terminal device 100 is further configured to, when the second duration is smaller than the preset duration threshold, continuously maintain the listening state until a paging message sent by the base station 200 in the PO is listened to;
the base station 200 is configured to calculate the PF and the PO, calculate a location of the PO according to the PF and the PO, and send the paging message at the location of the PO.
Further, the terminal device 100 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first duration of the PO from a time when the terminal device 100 enters a sleep state according to the PF and the PO, and start timing when entering the sleep state, specifically including:
calculating the PF and the PO, acquiring frame information corresponding to a first channel occupation time at which the terminal device 100 enters a sleep state, determining frame information corresponding to a second channel occupation time at which the PO is located according to the PF, the PO and the frame information corresponding to the first channel occupation time, calculating a first time length between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time, calculating a third time length between the PO and a preamble sequence preamble of the second channel occupation time according to the frame information corresponding to the second channel occupation time at which the PO is located, and starting timing when the terminal device enters the sleep state.
For example, assume that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupancy time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupancy time (i.e., the corresponding frame information in the second channel occupancy time), and therefore, a first time length T of 11 × (3 × 8+1) × (8+3+1) × T between the corresponding frame information in the first channel occupation time and the corresponding frame information in the second channel occupation time may be calculated, where T is a time length of one subframe; it is also possible to calculate a third duration T1 ═ 8+3+1 × T between the PO and the preamble of the second channel occupation time (specifically, the start position of the preamble, and the length of one preamble is equal to the length of one subframe).
Further, the terminal device 100 is configured to enter an awake state when the timed duration reaches a target duration, and calculate a second duration between the current time and the PO according to the frame information of the current time, and specifically includes:
when the timed duration reaches the target duration, entering an awakening state, detecting the preset early awakening duration, determining a synchronization mode of the terminal equipment 100 according to the third duration and the duration required by the terminal equipment 100 to perform discrete synchronization when the preset early awakening duration is at least the duration required by the terminal equipment 100 to perform discrete synchronization, synchronizing according to the determined synchronization mode, after synchronization is completed, monitoring system information to obtain frame information corresponding to the third channel occupation time at the current moment, and calculating a second duration between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
If the awakened terminal device 100 is not in the LBT duration, the terminal device 100 may immediately perform synchronization in the determined synchronization manner, and after the synchronization is completed, listen to a system message to obtain frame information corresponding to the third channel occupation time in which the current time is located. If the awakened terminal device 100 is in the LBT duration, the terminal device 100 needs to wait for the end of the LBT duration, and starts to synchronize in the determined synchronization manner when encountering the first preamble, and after synchronization is completed, listens to the system message to obtain the frame information corresponding to the third channel occupation time in which the current time is located.
Further, the terminal device 100 is configured to determine a synchronization mode of the terminal device 100 according to the third duration and a duration required by the terminal device 100 to perform discrete synchronization, and specifically includes:
and judging whether the third time length is less than the time length required by the terminal equipment 100 for discrete synchronization, if so, determining that the synchronization mode of the terminal equipment 100 is a continuous synchronization mode, otherwise, determining that the synchronization mode of the terminal equipment 100 is a discrete synchronization mode.
Further, the terminal device 100 is configured to enter an awake state when the timed duration reaches a target duration, and calculate a second duration between the current time and the PO according to the frame information of the current time, and specifically includes:
and when the timed duration reaches the target duration, entering an awakening state, detecting the preset early awakening duration, synchronizing according to a continuous synchronization mode when the preset early awakening duration is at least the third duration, after synchronization is completed, monitoring system information to acquire frame information corresponding to the third channel occupation time of the current moment, and calculating a second duration between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
The terminal device 100 in the embodiment of the present invention may calculate a first duration from the time when the PO is in the sleep state to the time when the terminal device 100 enters the sleep state according to the PF and the PO, start timing when the terminal device enters the sleep state, enter the awake state when the timed duration reaches the target duration, and calculate a second duration from the current time to the PO according to the frame information of the current time; the target time length is a difference value between the first time length and a preset early awakening time length; when the second time length is greater than a preset time length threshold, taking the difference value between the second time length and the early awakening time length as a new target time length, and continuing to enter a sleep state and start timing; when the second duration is less than the duration threshold, continuously keeping the interception state until the paging message sent by the base station 200 in the PO is intercepted; therefore, after each awakening, the terminal device 100 may calculate the duration of the distance PO by acquiring the current frame information, and determine to continue to enter the sleep state or continuously maintain the listening state according to the calculated duration, so as to ensure that the terminal device 100 can listen to the paging message sent by the base station 200 each time in the unlicensed spectrum; moreover, by determining the size between the third duration and the duration required by the terminal device 100 to perform the discrete synchronization, the synchronization mode that the terminal device 100 should use can be determined, so as to avoid missing PO due to too long synchronization time, and further ensure that the terminal device 100 can accurately listen to the paging message sent by the base station 200.
Referring to fig. 8, it is a schematic structural diagram of a paging system based on unlicensed spectrum according to an embodiment of the present invention, where the system includes: base station 400 and terminal apparatus 300;
the base station 400 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first duration of the PO from a time when the terminal device 300 enters a sleep state according to the PF and the PO, and start timing when the terminal device 300 enters the sleep state;
the base station 400 is further configured to send a synchronization signal and obtain a synchronization mode of the terminal device 300 when the timed duration reaches a target duration and the base station 400 has successfully preempted a channel; the target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length of the terminal device 300 in a sleep state;
the base station 400 is further configured to determine a time window for sending a paging message according to the synchronization mode, and send the paging message to the terminal device 300 within the time window;
the terminal device 300 is configured to calculate a paging frame PF and a paging occasion PO, calculate a first time length of the PO from a time when the terminal device 300 enters a sleep state according to the PF and the PO, start timing when the terminal device 300 enters the sleep state, enter an awake state when the timed time length reaches a target time length, and continuously maintain an interception state until the paging message sent by the base station 400 is intercepted.
For example, assume that there are 3 frames in a channel occupying time, each frame has 8 subframes, the calculated PF is 34, the PO is 3, the time of entering the sleep state is the subframe 0 of the frame 0 of the channel occupying time 0 (i.e. the corresponding frame information in the first channel occupying time), the PF is the second frame in the 12 th channel occupancy time (assuming that the frame number and the subframe number both start from 0), the PO is the 4 th subframe of the second frame in the 12 th channel occupancy time (i.e., the corresponding frame information in the second channel occupancy time), and therefore, a first duration T of 11 × (3 × 8+1) × (8+3+1) × T between the corresponding frame information in the first channel occupying time and the corresponding frame information in the second channel occupying time may be calculated, where T is a duration of one subframe.
The specific process of the base station 400 acquiring the synchronization mode of the terminal device 300 may be as follows: and judging the preset early awakening time length according to a preset protocol or rule so as to determine the synchronization mode of the terminal equipment 300. The protocol or rule for judging the preset early wake-up duration may be: if the preset early wake-up duration is greater than or equal to a duration T2 required by the terminal device 300 to perform discrete synchronization, determining whether a duration T1 of the PO from the initial position of the occupied time of the channel where the PO is located is less than T2, if so, determining that the synchronization mode is a continuous synchronization mode, otherwise, determining that the synchronization mode is a discrete synchronization mode; or may be: if the preset early wake-up duration is greater than or equal to T1, determining that the synchronization mode is a continuous synchronization mode, if the preset early wake-up duration is less than T1, further determining whether the preset early wake-up duration is greater than or equal to T2, if determining that the preset early wake-up duration is greater than or equal to T2 (indicating that T1 is greater than T2), determining that the synchronization mode is a discrete synchronization mode, and if determining that the preset early wake-up duration is less than T2, determining that the synchronization of the terminal device 300 fails. The protocol or rule for judging the preset early wake-up time in the present invention may also be in other forms (only needs to ensure that the terminal device 300 does not miss synchronization), and is not described in detail herein.
Further, the base station 400 is configured to determine a time window for sending a paging message according to the synchronization mode, and send the paging message to the terminal device 300 within the time window, which specifically includes:
when the synchronization mode is a continuous synchronization mode, searching a preamble sequence preamble of the first channel occupation time after the terminal device 300 enters an awake state, setting a time window behind the preamble, and sending the paging message to the terminal device 300 in the time window;
when the synchronization mode is the discrete synchronization mode, determining the synchronization success time of the terminal device 300 according to the time length required by the terminal device 300 to perform the discrete synchronization, setting a time window after the synchronization success time, and sending the paging message to the terminal device 300 in the time window.
When the timed duration reaches the target duration and the base station 400 successfully occupies the channel, the base station 400 synchronizes with the terminal equipment 300 in the wake-up state, acquires the synchronization mode of the terminal equipment 300, determines a time window for sending the paging message according to the synchronization mode, and sends the paging message to the terminal equipment 300 in the time window; therefore, the base station 400 selects the time for sending the paging message according to the actual wake-up time of the terminal device 300 and the synchronization duration of the terminal device 300, so that the terminal device 300 can be ensured to listen to the paging message sent by the base station 400 each time.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (18)

1. A method for paging based on unlicensed spectrum, comprising:
the method comprises the steps that a terminal device calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from a time when the terminal device enters a sleep state according to the PF and the PO, and starts timing when the terminal device enters the sleep state;
when the timed duration reaches the target duration, entering an awakening state, and calculating a second duration between the current time and the PO according to the frame information of the current time; the target time length is the difference value between the first time length and a preset early awakening time length;
when the second time length is greater than a preset time length threshold value, taking the difference value between the second time length and the preset early awakening time length as a new target time length, and continuing to enter the sleep state and start timing; alternatively, the first and second electrodes may be,
and when the second time length is less than the preset time length threshold value, continuously keeping the interception state until the paging message sent by the base station in the PO is intercepted.
2. The method of claim 1, wherein the terminal device calculates a Paging Frame (PF) and a Paging Occasion (PO), calculates a first duration of the PO from a time when the terminal device enters a sleep state according to the PF and the PO, and starts timing when entering the sleep state, comprising:
the terminal equipment calculates the PF and the PO and acquires corresponding frame information in the first channel occupation time at the moment when the terminal equipment enters the sleep state;
determining frame information corresponding to the PO in the second channel occupation time according to the PF, the PO and the frame information corresponding to the first channel occupation time, and calculating a first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time;
and calculating a third duration between the PO and a preamble sequence preamble of the second channel occupation time according to the frame information corresponding to the PO in the second channel occupation time, and starting timing when entering the sleep state.
3. The method of claim 2, wherein entering an awake state when the timed duration reaches a target duration, and calculating a second duration from the current time to the PO according to frame information of the current time comprises:
when the timed duration reaches the target duration, entering an awakening state, and detecting the preset advanced awakening duration;
when the preset early awakening time length is at least the time length required by the terminal equipment for discrete synchronization, determining the synchronization mode of the terminal equipment according to the third time length and the time length required by the terminal equipment for discrete synchronization;
synchronizing according to the determined synchronization mode, and after synchronization is completed, monitoring system information to acquire corresponding frame information in the occupation time of a third channel where the current time is;
and calculating a second duration between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
4. The method of claim 3, wherein the determining the synchronization mode of the terminal device according to the third duration and the duration required by the terminal device to perform discrete synchronization comprises:
judging whether the third time length is less than the time length required by the terminal equipment for discrete synchronization;
if the terminal equipment is judged to be in the continuous synchronization mode, determining the synchronization mode of the terminal equipment to be in the continuous synchronization mode;
otherwise, determining the synchronization mode of the terminal equipment as a discrete synchronization mode.
5. The method of claim 2, wherein entering an awake state when the timed duration reaches a target duration, and calculating a second duration from the current time to the PO according to frame information of the current time comprises:
when the timed duration reaches the target duration, entering an awakening state, and detecting the preset advanced awakening duration;
when the preset early awakening time length is at least the third time length, synchronizing according to a continuous synchronization mode, and after synchronization is completed, monitoring system information to acquire corresponding frame information in the third channel occupation time of the current time;
and calculating a second duration between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
6. A method for paging based on unlicensed spectrum, comprising:
a base station calculates a paging frame PF and a paging occasion PO, calculates a first time length of the PO from a time when a terminal device enters a sleep state according to the PF and the PO, and starts timing when the terminal device enters the sleep state;
when the timed duration reaches the target duration and the base station successfully seizes the channel, sending a synchronization signal and acquiring the synchronization mode of the terminal equipment; the target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length of the terminal equipment in a sleep state;
and determining a time window for sending the paging message according to the synchronization mode, and sending the paging message to the terminal equipment in the time window.
7. The method of claim 6, wherein the determining a time window for sending a paging message according to the synchronization mode and sending the paging message to the terminal device within the time window comprises:
when the synchronous mode is a continuous synchronous mode, searching a preamble sequence preamble of the first channel occupation time after the terminal equipment enters an awakening state, setting a time window behind the preamble, and sending the paging message to the terminal equipment in the time window;
and when the acquired synchronization mode is a discrete synchronization mode, determining the synchronization success time of the terminal equipment according to the time length required by the terminal equipment for performing discrete synchronization, setting a time window behind the synchronization success time, and sending the paging message to the terminal equipment in the time window.
8. A terminal device, comprising:
the processing module is used for calculating a paging frame PF and a paging occasion PO, calculating a first time length of the PO from the time when the terminal equipment enters a sleep state according to the PF and the PO, and starting timing when the PO enters the sleep state;
the processing module is used for entering an awakening state when the timed duration reaches a target duration, and calculating a second duration between the current time and the PO according to the frame information of the current time; the target time length is the difference value between the first time length and a preset early awakening time length;
the processing module is used for taking the difference value between the second time length and the preset early awakening time length as a new target time length when the second time length is greater than a preset time length threshold, and continuing to enter the sleep state and start timing;
and the receiving module is used for continuously keeping the interception state when the second time length calculated by the processing module is less than the preset time length threshold value until the paging message sent by the base station in the PO is intercepted.
9. The terminal device of claim 8, wherein the processing module is configured to calculate a paging frame PF and a paging occasion PO, calculate a first duration of the PO from a time when the terminal device enters a sleep state according to the PF and the PO acquired by the receiving module, and start timing when the terminal device enters the sleep state, and specifically includes:
calculating the PF and the PO, acquiring frame information corresponding to first channel occupation time at the moment when the terminal equipment enters a sleep state, determining frame information corresponding to second channel occupation time of the PO according to the PF, the PO and the frame information corresponding to the first channel occupation time, calculating first duration between the frame information corresponding to the first channel occupation time and the frame information corresponding to the second channel occupation time, calculating third duration between the PO and a preamble sequence preamble of the second channel occupation time according to the frame information corresponding to the second channel occupation time of the PO, and starting timing when the terminal equipment enters the sleep state.
10. The terminal device of claim 9, wherein the processing module is configured to calculate, according to the frame information at the current time, a second duration between the current time and the PO, and specifically includes:
when the preset early awakening time length is at least the time length required by the terminal equipment for discrete synchronization, determining the synchronization mode of the terminal equipment according to the third time length and the time length required by the terminal equipment for discrete synchronization, synchronizing according to the determined synchronization mode, after synchronization is completed, monitoring system information, acquiring frame information corresponding to the third channel occupation time of the current time, and calculating a second time length between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
11. The terminal device of claim 10, wherein the processing module is configured to determine a synchronization mode of the terminal device according to the third duration and a duration required by the terminal device for performing discrete synchronization, and specifically includes:
and judging whether the third time length is less than the time length required by the terminal equipment for discrete synchronization, if so, determining that the synchronization mode of the terminal equipment is a continuous synchronization mode, and if not, determining that the synchronization mode of the terminal equipment is a discrete synchronization mode.
12. The terminal device of claim 9, wherein the processing module is configured to calculate, according to frame information of a current time, a second time duration between the current time and the PO, and specifically includes:
and when the preset early awakening time length is at least the third time length, synchronizing according to a continuous synchronization mode, after synchronization is completed, intercepting system information to acquire frame information corresponding to the third channel occupation time of the current time, and calculating a second time length between the frame information corresponding to the second channel occupation time and the frame information corresponding to the third channel occupation time.
13. A base station, comprising:
the processing module is used for calculating a paging frame PF and a paging occasion PO, calculating a first time length of the PO from the time when the terminal equipment enters a sleep state according to the PF and the PO, and starting timing when the terminal equipment enters the sleep state;
the sending module is used for sending a synchronous signal when the time length timed by the processing module reaches a target time length and the channel is successfully preempted; the target time length is a difference value between the first time length and a preset early awakening time length, and the target time length is a time length of the terminal equipment in a sleep state;
the receiving module is used for acquiring the synchronization mode of the terminal equipment after the sending module sends the synchronization signal;
the processing module is used for determining a time window for sending the paging message according to the synchronization mode acquired by the receiving module;
and the sending module is used for sending the paging message to the terminal equipment in the time window determined by the processing module.
14. The base station of claim 13, wherein the processing module is configured to determine a time window for sending a paging message according to the synchronization mode acquired by the receiving module, and specifically includes:
when the synchronous mode is a continuous synchronous mode, searching a preamble sequence of the first channel occupation time after the terminal equipment enters an awakening state, and setting a time window behind the preamble;
and when the acquired synchronization mode is the discrete synchronization mode, determining the synchronization success time of the terminal equipment according to the time length required by the terminal equipment for performing discrete synchronization, and setting a time window behind the synchronization success time.
15. A paging system based on unlicensed spectrum, comprising: a base station and a terminal device according to any of claims 8-12;
the base station is used for calculating a paging frame PF and a paging occasion PO, calculating the position of the PO according to the PF and the PO, and sending a paging message at the position of the PO.
16. A paging system based on unlicensed spectrum, comprising: a terminal device and a base station according to claim 13 or 14;
the terminal device is used for calculating a paging frame PF and a paging occasion PO, calculating a first time length of the PO from the time when the terminal device enters a sleep state according to the PF and the PO, starting timing when the terminal device enters the sleep state, entering an awakening state when the timed time length reaches a target time length, and continuously keeping a monitoring state until a paging message sent by the base station is monitored.
17. A computer-readable storage medium, comprising: the computer-readable storage medium stores a computer program, wherein the computer program is capable of implementing the method of any one of claims 1 to 5 when executed by hardware.
18. A computer-readable storage medium, comprising: the computer-readable storage medium stores a computer program, wherein the computer program is capable of implementing the method of any one of claims 6 to 7 when executed by hardware.
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