CN110740496B - Time synchronization method and device, and time synchronization indication method and device - Google Patents

Time synchronization method and device, and time synchronization indication method and device Download PDF

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Publication number
CN110740496B
CN110740496B CN201810802132.4A CN201810802132A CN110740496B CN 110740496 B CN110740496 B CN 110740496B CN 201810802132 A CN201810802132 A CN 201810802132A CN 110740496 B CN110740496 B CN 110740496B
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message
wake
terminal
base station
time synchronization
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CN110740496A (en
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董贤东
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Meizu Technology Co Ltd
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Meizu Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention provides a time synchronization method and device, a time synchronization indicating method and device and communication equipment. The method for time synchronization applied to the terminal comprises the following steps: receiving a wake-up message according to a preset period, wherein the information of the received message is indicated by an identifier in the wake-up message; and performing time synchronization with the base station according to the information indicating the received message. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.

Description

Time synchronization method and device, and time synchronization indication method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for time synchronization, a method and an apparatus for indicating time synchronization, and a communication device.
Background
Currently, development work of a 5 th generation mobile communication system (5G) is actively underway. According to the future application requirements, the 5G system needs to support a variety of service scenarios, including EMBB (Enhanced Mobile Broadband), URLLC (Ultra-reliable and Low Latency Communications), and MMTC (Massive Machine Type of Communication). In the process of standard formulation, it is proposed that an enhancement is needed in terms of terminal power saving, in 3GPP (3rd Generation Partnership Project) R14 standard, a major research is made on terminal power saving in RRC-connected state, in R16 standard, a further research is made on power saving in RRC-connected state, and of course, how to save power in RRC _ IDLE state/RRC _ INACTIVE state.
In the standard system, it is proposed that a UE (User Equipment) monitors a PDCCH (Physical Downlink Control Channel) which accounts for 40% of the entire power consumption, performs data transmission by approximately 20%, and performs presynchronization by approximately 10%.
The purpose of time synchronization is to enable the UE to wake up at any time to access the network to receive or transmit uplink and downlink data, even if the UE is in RRC _ IDLE/RRC _ INACTIVE, the UE periodically monitors PDCCH information to keep time synchronization with the network side, and the purpose of wake-up mechanism is to save power as much as possible for the terminal, so the Pre-syn mechanism needs to be improved to ensure power saving of the terminal.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to propose a method of time synchronization.
Another aspect of the present invention is to provide a method for indicating time synchronization.
Yet another aspect of the present invention is to provide an apparatus for time synchronization.
Yet another aspect of the present invention is to provide a time synchronized pointing device.
Yet another aspect of the present invention is to provide a communication device.
In view of the above, according to an aspect of the present invention, a method for time synchronization is provided, which is applied to a terminal, and the method includes: receiving a wake-up message according to a preset period, wherein the information of the received message is indicated by an identifier in the wake-up message; and performing time synchronization with the base station according to the information indicating the received message.
According to the time synchronization method provided by the invention, the terminal wakes up for a short time according to the preset period negotiated with the base station to receive the wake-up message, the wake-up message comprises the information indicating the terminal to receive the message, and the terminal keeps time synchronization with the base station according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above technical solution, a physical receiving unit of the wake-up message is different from a physical receiving unit of the paging message, and an amount of power consumed for receiving the wake-up message is much smaller than an amount of power consumed for receiving the paging message. The same may be true for the received physical unit of the wake-up message and the received physical unit of the paging message, which are both based on the physical implementation of the terminal.
Further, in the above solution, the ON period of the wake-up message is smaller than that of the paging message, such as 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol, which is defined based ON the content of the wake-up message or is configured by the upper layer.
The time synchronization method according to the present invention may further have the following technical features:
in the above technical solution, preferably, the information indicating the received message includes a time advance of the received message.
In the technical scheme, the information indicating the received message included in the wake-up message may be a time advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the time advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In any of the above technical solutions, preferably, the method further includes: receiving a system message sent by a base station after a preset time period from the receiving of the wake-up message; and the preset time period is more than or equal to 3 subframes.
In the technical scheme, the terminal enters the wake-up state (different from the transient wake-up) after receiving the preset time period of the wake-up cycle, and receives the system message in the wake-up state, wherein the preset time period is more than or equal to 3 subframes, so that the terminal has enough time to fully enter the wake-up state, and the system message is ensured to be successfully received.
In any of the above technical solutions, preferably, before receiving the wake-up message according to a preset period, the method further includes: before entering an awakening state, receiving information of a preset period sent by a base station; the preset period is greater than the sleep period of the terminal.
In the technical scheme, before entering the wake-up state, the terminal negotiates with the base station for a preset period for receiving the wake-up message, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the wake-up message according to the preset period.
According to another aspect of the present invention, an indication method of time synchronization is provided, which is applied to a base station, and the method includes: and sending a wake-up message to the terminal according to a preset period, wherein the identifier in the wake-up message indicates the information of the received message, so that the terminal can perform time synchronization with the base station according to the information of the indicated received message.
In the time synchronization indicating method provided by the invention, the base station and the terminal negotiate a preset period to send a wake-up message to the terminal, wherein the wake-up message comprises information for indicating the terminal to receive the message, so that the terminal and the base station can keep time synchronization according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above technical solution, a physical unit for sending the wake-up message is different from a physical unit for sending the paging message, and an amount of power consumed for sending the wake-up message is much smaller than an amount of power consumed for sending the paging message. The same may be true for the physical units for sending wake-up messages and for sending paging messages, which are all based on the physical implementation of the base station.
Further, in the above solution, the ON period of the wake-up message may be smaller than the ON period of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
The method for indicating time synchronization according to the present invention may further include the following technical features:
in the above technical solution, preferably, the information indicating the received message includes a time advance of the received message.
In the technical scheme, the information indicating the received message included in the wake-up message may be a time advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the time advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In any of the above technical solutions, preferably, before sending the wake-up message to the terminal according to a preset period, the method further includes: and setting a preset period and sending information of the preset period to the terminal.
In the technical scheme, before entering the wake-up state, the terminal negotiates with the base station for a preset period for receiving the wake-up message, and the base station sets the preset period for the terminal, wherein the preset period is longer than a sleep period (1280ms) of a wake-up mode of the existing terminal, so that the terminal can accurately receive the wake-up message according to the preset period.
According to another aspect of the present invention, an apparatus for time synchronization is provided, which is applied to a terminal, and includes: the receiving module is used for receiving the awakening message according to a preset period, and the identification in the awakening message indicates the information of the received message; and the processing module is used for carrying out time synchronization with the base station according to the information indicating the received message.
According to the time synchronization device provided by the invention, the terminal wakes up for a short time according to the preset period negotiated with the base station to receive the wake-up message, the wake-up message comprises the information indicating the terminal to receive the message, and the terminal keeps time synchronization with the base station according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above technical solution, a physical receiving unit of the wake-up message is different from a physical receiving unit of the paging message, and an amount of power consumed for receiving the wake-up message is much smaller than an amount of power consumed for receiving the paging message. The same may be true for the received physical unit of the wake-up message and the received physical unit of the paging message, which are both based on the physical implementation of the terminal.
Further, in the above solution, the ON period of the wake-up message may be smaller than the ON period of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
The time synchronization apparatus according to the present invention may further have the following technical features:
in the above technical solution, preferably, the information indicating the received message includes a time advance of the received message.
In the technical scheme, the information indicating the received message included in the wake-up message may be a time advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the time advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In any of the above technical solutions, preferably, the receiving module is further configured to receive a system message sent by the base station after a preset time period elapses from the time when the wake-up message is received; and the preset time period is more than or equal to 3 subframes.
In the technical scheme, the terminal enters the wake-up state (different from the transient wake-up) after receiving the preset time period of the wake-up cycle, and receives the system message in the wake-up state, wherein the preset time period is more than or equal to 3 subframes, so that the terminal has enough time to fully enter the wake-up state, and the system message is ensured to be successfully received.
In any of the above technical solutions, preferably, the receiving module is further configured to receive information of a preset period sent by the base station before entering the wake-up state; the preset period is greater than the sleep period of the terminal.
In the technical scheme, before entering the wake-up state, the terminal negotiates with the base station for a preset period for receiving the wake-up message, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the wake-up message according to the preset period.
According to another aspect of the present invention, an indication apparatus for time synchronization is provided, which is applied to a base station, and includes: and the sending module is used for sending a wake-up message to the terminal according to a preset period, wherein the identifier in the wake-up message indicates the information of the received message, so that the terminal can perform time synchronization with the base station according to the information indicating the received message.
According to the time synchronization indicating device provided by the invention, the base station and the terminal negotiate a preset period to send the awakening message to the terminal, wherein the awakening message comprises information for indicating the terminal to receive the message, so that the terminal and the base station can keep time synchronization according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above technical solution, a physical unit for sending the wake-up message is different from a physical unit for sending the paging message, and an amount of power consumed for sending the wake-up message is much smaller than an amount of power consumed for sending the paging message. The same may be true for the physical units for sending wake-up messages and for sending paging messages, which are all based on the physical implementation of the base station.
Further, in the above solution, the ON period of the wake-up message may be smaller than the ON period of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
The time synchronization indicating device according to the present invention may further include the following technical features:
in the above technical solution, preferably, the information indicating the received message includes a time advance of the received message.
In the technical scheme, the information indicating the received message included in the wake-up message may be a time advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the time advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In any of the above technical solutions, preferably, the method further includes: the setting module is used for setting a preset period; and the sending module is also used for sending the information of the preset period to the terminal.
In the technical scheme, before entering the wake-up state, the terminal negotiates with the base station for a preset period for receiving the wake-up message, and the base station sets the preset period for the terminal, wherein the preset period is longer than a sleep period (1280ms) of a wake-up mode of the existing terminal, so that the terminal can accurately receive the wake-up message according to the preset period.
According to a further aspect of the present invention, there is provided a communication device, comprising the apparatus for time synchronization of any of the above technical solutions, or the apparatus for indicating time synchronization of any of the above technical solutions.
The communication device provided by the present invention includes the time synchronization apparatus according to any one of the above-mentioned technical aspects, or the time synchronization instruction apparatus according to any one of the above-mentioned technical aspects, and can achieve all the advantageous effects of the time synchronization apparatus according to any one of the above-mentioned technical aspects, or the time synchronization instruction apparatus according to any one of the above-mentioned technical aspects.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow diagram of a method of time synchronization of one embodiment of the present invention;
FIG. 2 shows a flow diagram of a method of time synchronization of another embodiment of the present invention;
FIG. 3 illustrates a flow diagram of a method of time synchronization of yet another embodiment of the present invention;
FIG. 4 is a diagram illustrating a preset period for receiving a wake-up message according to an embodiment of the present invention;
FIG. 5 is a flow chart illustrating a method of indicating time synchronization according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating a method of indicating time synchronization according to another embodiment of the present invention;
FIG. 7 shows a schematic diagram of an apparatus for time synchronization of one embodiment of the present invention;
FIG. 8 shows a schematic view of a time synchronized pointing device of one embodiment of the present invention;
fig. 9 shows a schematic diagram of a time synchronized pointing device according to another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
An embodiment of the first aspect of the present invention provides a time synchronization method, which is applied to a terminal, and fig. 1 illustrates a flowchart of the time synchronization method according to an embodiment of the present invention. Wherein, the method comprises the following steps:
102, receiving a wake-up message according to a preset period, wherein the information of the received message is indicated by an identifier in the wake-up message;
and step 104, performing time synchronization with the base station according to the information indicating the received message.
According to the time synchronization method provided by the invention, the terminal wakes up transiently according to the preset period negotiated with the base station to receive the wake-up message, the wake-up message comprises the information for indicating the terminal to receive the message, and the terminal keeps time synchronization with the base station according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above embodiment, the physical unit of reception of the wake-up message is different from the physical unit of reception of the paging message, and the amount of power consumed for reception thereof is much smaller than the amount of power consumed for reception of the paging message. The same may be true for the received physical unit of the wake-up message and the received physical unit of the paging message, which are both based on the physical implementation of the terminal.
Further, in the above embodiment, the ON period of the wake-up message may be smaller than that of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
In a specific embodiment, the terminal may be a network device such as a smart phone, a tablet computer, and a notebook computer.
Fig. 2 shows a flow diagram of a method of time synchronization according to another embodiment of the invention. Wherein, the method comprises the following steps:
step 202, receiving a wake-up message according to a preset period, wherein the information of the received message is indicated by an identifier in the wake-up message;
step 204, performing time synchronization with the base station according to the information indicating the received message;
step 206, receiving a system message sent by the base station after a preset time period from the receiving of the wake-up message; and the preset time period is more than or equal to 3 subframes.
In this embodiment, the terminal enters the wake-up state after receiving a preset time period of the wake-up cycle (different from the above-mentioned transient wake-up), and receives the system message in the wake-up state, where the preset time period is greater than or equal to 3 subframes, so as to ensure that the terminal has enough time to fully enter the wake-up state, thereby ensuring smooth reception of the system message.
Fig. 3 shows a flow diagram of a method of time synchronization according to a further embodiment of the invention. Wherein, the method comprises the following steps:
step 302, receiving information of a preset period sent by a base station; the preset period is greater than the sleep period of the terminal;
step 304, receiving a wake-up message according to a preset period, wherein the information of the received message is indicated by an identifier in the wake-up message;
step 306, performing time synchronization with the base station according to the information indicating the received message;
step 308, receiving a system message sent by the base station after a preset time period from the receiving of the wake-up message; and the preset time period is more than or equal to 3 subframes.
In this embodiment, before entering the awake state, the terminal negotiates with the base station for a preset period for receiving the awake message, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the awake message according to the preset period. As shown in fig. 4, a DRX (Discontinuous Reception) cycle of the terminal is composed of a wake-up cycle and a sleep cycle, where the terminal wakes up briefly in the sleep cycle to receive a wake-up message, and a preset cycle for receiving the wake-up message is longer than the sleep cycle.
In one embodiment of the present invention, preferably, the information indicating the received message includes a time advance of the received message.
In the technical scheme, the information indicating the received message included in the wake-up message may be a time advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the time advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
An embodiment of a second aspect of the present invention provides a method for indicating time synchronization, which is applied to a base station, and fig. 5 illustrates a flowchart of the method for indicating time synchronization according to an embodiment of the present invention. Wherein, the method comprises the following steps:
step 502, sending a wake-up message to the terminal according to a preset period, wherein the identifier in the wake-up message indicates information of the received message, so that the terminal performs time synchronization with the base station according to the information indicating the received message.
In the time synchronization indicating method provided by the invention, the base station and the terminal negotiate a preset period to send a wake-up message to the terminal, wherein the wake-up message comprises information for indicating the terminal to receive the message, so that the terminal and the base station can keep time synchronization according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above embodiment, the physical unit for sending the wake-up message is different from the physical unit for sending the paging message, and the amount of power consumed for sending the wake-up message is much smaller than the amount of power consumed for sending the paging message. The same may be true for the physical units for sending wake-up messages and for sending paging messages, which are all based on the physical implementation of the base station.
Further, in the above embodiment, the ON period of the wake-up message may be smaller than that of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
In a specific embodiment, the terminal may be a network device such as a smart phone, a tablet computer, and a notebook computer.
Fig. 6 is a flowchart illustrating an indication method of time synchronization according to another embodiment of the present invention. Wherein, the method comprises the following steps:
step 602, setting a preset period, and sending information of the preset period to a terminal;
step 604, sending a wake-up message to the terminal according to a preset period, wherein the identifier in the wake-up message indicates information of the received message, so that the terminal performs time synchronization with the base station according to the information of the received message.
In this embodiment, before entering the awake state, the terminal negotiates with the base station for a preset period for receiving the awake message, and the base station sets the preset period for the terminal, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the awake message according to the preset period. As shown in fig. 4, a DRX (Discontinuous Reception) cycle of the terminal is composed of a wake-up cycle and a sleep cycle, where the terminal wakes up briefly in the sleep cycle to receive a wake-up message, and a preset cycle for receiving the wake-up message is longer than the sleep cycle.
In one embodiment of the present invention, preferably, the information indicating the received message includes a time advance of the received message.
In this embodiment, the information indicating the received message included in the wake-up message may be a timing advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the timing advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In a third aspect of the present invention, a time synchronization apparatus is provided for a terminal, and fig. 7 is a schematic diagram of the time synchronization apparatus 70 according to an embodiment of the present invention. Wherein the device 70 comprises:
a receiving module 702, configured to receive a wake-up message according to a preset period, where an identifier in the wake-up message indicates information of the received message;
a processing module 704 configured to perform time synchronization with the base station according to the information indicating the received message.
According to the time synchronization device 70 provided by the present invention, the terminal wakes up for a short time according to the preset period negotiated with the base station to receive the wake-up message, the wake-up message includes information indicating that the terminal receives the message, and the terminal maintains time synchronization with the base station according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above embodiment, the physical unit of reception of the wake-up message is different from the physical unit of reception of the paging message, and the amount of power consumed for reception thereof is much smaller than the amount of power consumed for reception of the paging message. The same may be true for the received physical unit of the wake-up message and the received physical unit of the paging message, which are both based on the physical implementation of the terminal.
Further, in the above embodiment, the ON period of the wake-up message may be smaller than that of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
In a specific embodiment, the terminal may be a network device such as a smart phone, a tablet computer, and a notebook computer. The receiving module 702 may be a receiver or an antenna, etc., and the processing module 704 may be a central processor or a baseband processor, etc.
In one embodiment of the present invention, preferably, the information indicating the received message includes a time advance of the received message.
In this embodiment, the information indicating the received message included in the wake-up message may be a timing advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the timing advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
In an embodiment of the present invention, preferably, the receiving module 702 is further configured to receive a system message sent by the base station after a preset time period from the receiving of the wake-up message; and the preset time period is more than or equal to 3 subframes.
In this embodiment, the terminal enters the wake-up state after receiving a preset time period of the wake-up cycle (different from the above-mentioned transient wake-up), and receives the system message in the wake-up state, where the preset time period is greater than or equal to 3 subframes, so as to ensure that the terminal has enough time to fully enter the wake-up state, thereby ensuring smooth reception of the system message.
In an embodiment of the present invention, preferably, the receiving module 702 is further configured to receive information of a preset period sent by the base station before entering the awake state; the preset period is greater than the sleep period of the terminal.
In this embodiment, before entering the awake state, the terminal negotiates with the base station for a preset period for receiving the awake message, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the awake message according to the preset period. As shown in fig. 4, a DRX (Discontinuous Reception) cycle of the terminal is composed of a wake-up cycle and a sleep cycle, where the terminal wakes up briefly in the sleep cycle to receive a wake-up message, and a preset cycle for receiving the wake-up message is longer than the sleep cycle.
In the fourth aspect of the present invention, a time synchronization indicating apparatus is provided, which is applied to a base station, and fig. 8 shows a schematic diagram of a time synchronization indicating apparatus 80 according to an embodiment of the present invention. Wherein the device 80 comprises:
a sending module 802, configured to send a wake-up message to the terminal according to a preset period, where an identifier in the wake-up message indicates information of a received message, so that the terminal performs time synchronization with the base station according to the information indicating the received message.
According to the time synchronization indicating device 80 provided by the invention, the base station and the terminal negotiate a preset period to send the wake-up message to the terminal, wherein the wake-up message comprises information for indicating the terminal to receive the message, so that the terminal and the base station can keep time synchronization according to the information. By adopting the technical scheme of the invention, the terminal in the wake-up mode does not need to periodically wake up to receive paging information at the base station side so as to obtain the time synchronization parameter, but can accurately perform time synchronization (uplink synchronization) with the base station side when receiving the wake-up information so as to monitor the PDCCH, and the aim of saving power of the terminal can be achieved.
Further, in the above embodiment, the physical unit for sending the wake-up message is different from the physical unit for sending the paging message, and the amount of power consumed for sending the wake-up message is much smaller than the amount of power consumed for sending the paging message. The same may be true for the physical units for sending wake-up messages and for sending paging messages, which are all based on the physical implementation of the base station.
Further, in the above embodiment, the ON period of the wake-up message may be smaller than that of the paging message, such as 1 OFDM symbol, which is defined based ON the content of the wake-up message or is de-configured by the upper layer.
In a specific embodiment, the terminal may be a network device such as a smart phone, a tablet computer, and a notebook computer. The sending module 802 may be a transmitter or an antenna, etc.
Fig. 9 shows a schematic view of a time synchronized pointing device 90 according to another embodiment of the present invention. Wherein the device 90 comprises:
a setting module 902, configured to set a preset period; the sending module is also used for sending information of a preset period to the terminal;
a sending module 904, configured to send a wake-up message to the terminal according to a preset period, where an identifier in the wake-up message indicates information of a received message, so that the terminal performs time synchronization with the base station according to the information indicating the received message.
In this embodiment, before entering the awake state, the terminal negotiates with the base station for a preset period for receiving the awake message, and the base station sets the preset period for the terminal, where the preset period is longer than a sleep period (1280ms) of a wake-up mode of an existing terminal, so as to ensure that the terminal can accurately receive the awake message according to the preset period. As shown in fig. 4, a DRX (Discontinuous Reception) cycle of the terminal is composed of a wake-up cycle and a sleep cycle, where the terminal wakes up briefly in the sleep cycle to receive a wake-up message, and a preset cycle for receiving the wake-up message is longer than the sleep cycle.
In a specific embodiment, the setting module 902 may be a central processing unit, a base station controller, or the like, and the sending module 904 may be a transmitter, an antenna, or the like.
In one embodiment of the present invention, preferably, the information indicating the received message includes a time advance of the received message.
In this embodiment, the information indicating the received message included in the wake-up message may be a timing advance of the received message, and the terminal may accurately perform time synchronization with the base station side according to the timing advance. The time advance can be set by the base station with reference to the information value of the terminal before entering the wake-up mode.
An embodiment of a fifth aspect of the present invention provides a communication device, including the apparatus for time synchronization according to any of the foregoing embodiments, or the apparatus for indicating time synchronization according to any of the foregoing embodiments.
The communication device provided by the present invention includes the time synchronization apparatus of any of the above embodiments, or the time synchronization instruction apparatus of any of the above embodiments, and can achieve all the advantages of the time synchronization apparatus of any of the above embodiments, or the time synchronization instruction apparatus of any of the above embodiments.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A method for time synchronization, applied to a terminal, includes:
receiving a wakeup message according to a preset period negotiated with a base station, wherein the identification in the wakeup message indicates the information of the received message;
performing time synchronization with the base station according to the information indicating the received message;
the information indicating the received message comprises a time advance of the received message;
before receiving the wake-up message according to the preset period, the method further includes:
before entering an awakening state, receiving the information of the preset period sent by the base station;
and the preset period is greater than the sleep period of the terminal.
2. The method for time synchronization according to claim 1, further comprising:
receiving a system message sent by the base station after a preset time period from the receiving of the awakening message;
wherein the preset time period is greater than or equal to 3 subframes.
3. A method for indicating time synchronization is applied to a base station, and the method comprises the following steps:
sending a wake-up message to a terminal according to a preset period negotiated with a base station, wherein the information of a received message is indicated by an identifier in the wake-up message, so that the terminal can perform time synchronization with the base station according to the information of the received message;
the information indicating the received message comprises a time advance of the received message;
before sending the wake-up message to the terminal according to the preset period, the method further includes:
and setting the preset period, and sending the information of the preset period to the terminal.
4. An apparatus for time synchronization, applied to a terminal, the apparatus comprising:
the receiving module is used for receiving a wake-up message according to a preset period negotiated with a base station, wherein the information of the received message is indicated by an identifier in the wake-up message;
the processing module is used for carrying out time synchronization with the base station according to the information indicating the received message;
the receiving module is further configured to receive the information of the preset period sent by the base station before entering the wake-up state;
the preset period is greater than the sleep period of the terminal;
the information indicating the received message comprises a time advance of the received message.
5. The apparatus for time synchronization according to claim 4,
the receiving module is further configured to receive a system message sent by the base station after a preset time period elapses from the receiving of the wake-up message;
wherein the preset time period is greater than or equal to 3 subframes.
6. An indication device of time synchronization, applied to a base station, the device comprising:
the terminal comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending a wake-up message to the terminal according to a preset period negotiated with a base station, and the information of the received message is indicated by an identifier in the wake-up message so that the terminal can carry out time synchronization with the base station according to the information of the received message;
the information indicating the received message comprises a time advance of the received message;
further comprising:
the setting module is used for setting the preset period;
the sending module is further configured to send the information of the preset period to the terminal.
7. A communication device, comprising:
means for time synchronization according to claim 4 or 5; or
An indication device of time synchronization as claimed in claim 6.
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