CN111294134B - Time service method and device and electronic equipment - Google Patents
Time service method and device and electronic equipment Download PDFInfo
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- CN111294134B CN111294134B CN202010079791.7A CN202010079791A CN111294134B CN 111294134 B CN111294134 B CN 111294134B CN 202010079791 A CN202010079791 A CN 202010079791A CN 111294134 B CN111294134 B CN 111294134B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
The embodiment of the disclosure discloses a time service method, a time service device and electronic equipment, wherein the method comprises the following steps: responding to a time service trigger event, and determining the target quantity and the target time interval of the time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter; generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling; transmitting scheduling instructions over an air interface to one or more terminals within the coverage of the base station; the time service signaling is sent to one or more terminals within the coverage range of the base station on the time frequency resource block; and when the quantity of the issued time service signaling does not exceed the target quantity, generating and issuing the next time service signaling.
Description
Technical Field
The disclosure relates to the technical field of wireless communication, in particular to a time service method, a time service device and electronic equipment.
Background
According to a high-precision time service protocol (PTP protocol) provided in the IEEE1588v2 standard, the time service precision of 10ns magnitude can be achieved in a wired optical network by utilizing the link symmetry. In the current mobile network, uplink and downlink synchronization when the terminal communicates with the base station are relative time synchronization based on the alignment of radio frame/subframe boundaries, and absolute time service cannot be performed. Meanwhile, the traditional NTP time service protocol or PTP protocol directly used in the mobile network is affected by factors such as unstable air interface links, and the time service performance is reduced.
In addition, although the positioning/timing method based on the GNSS receiver is widely applied, the positioning/timing method is generally applicable to non-shielding scenes, and the GNSS cannot perform timing or has poor accuracy in indoor, tunnel, underground and other scenes; in addition, the GNSS is easy to receive interference, so that the GNSS is not suitable for time service aiming at the scenes such as a power grid and the like with special deployment scenes and high requirements on safety.
Disclosure of Invention
The embodiment of the disclosure provides a time service method, a time service device and electronic equipment.
In a first aspect, an embodiment of the present disclosure provides a time service method, where the method is performed on a base station in a mobile network, and includes:
responding to a time service trigger event, and determining the target quantity and the target time interval of the time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
sending a scheduling instruction to one or more terminals within the coverage of the base station through an air interface so as to inform the terminals of receiving time service signaling on the time frequency resource block;
the time service signaling is sent to one or more terminals within the coverage range of the base station on the time frequency resource block;
when the number of the issued time service signaling does not exceed the target number, generating and issuing the next time service signaling; and the issuing time interval between the two time service signaling is the target time interval.
Wherein, still include:
receiving configured time service parameters; the time service parameters comprise a time service period, a target number of the time service signaling, a target time interval between the two time service signaling and a time frequency resource block used for transmitting the time service signaling;
and starting a timer so as to generate the time service trigger event once every the time service period.
Wherein, the sending the time service signaling to one or more terminals in the coverage area of the base station on the time frequency resource block includes:
the time service signaling is sent to one or more terminals within the range of the base station in a broadcasting mode; alternatively, the first and second electrodes may be,
and respectively transmitting the time service signaling to one or more terminals within the range of the base station in a unicast mode.
In a second aspect, an embodiment of the present disclosure provides a time service method, where the method is executed on a terminal of a mobile network, where the terminal includes a baseband processing chip and a time service chip, and the method includes:
receiving a scheduling instruction sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
receiving the time service signaling sent by the base station according to a preset time interval on the time frequency resource block by using the baseband processing chip, and forwarding the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
and obtaining second absolute time information by using the time service chip according to the received multiple time service signaling, and adjusting the local time of the terminal by using the second absolute time information.
Wherein, still include:
and receiving the time lead sent by the base station through an air interface by using the baseband processing chip, and sending all the received time lead to the authorization chip.
The obtaining of the second absolute time information by using the time service chip according to the received multiple time service signaling includes:
and the time service chip calculates and obtains a time delay adjustment value of each time service signaling at least according to the local time of the terminal, the first absolute time in the time service signaling and the time advance, and calculates and obtains the second absolute time information according to the time delay adjustment value.
In a third aspect, an embodiment of the present disclosure provides a time service system, including: a base station and one or more terminals within the coverage of the base station;
the base station sends a time service signaling to the terminal by the method of the first aspect;
the terminal comprises a baseband processing chip and a time service chip, and the local time of the terminal is adjusted by the method of the second aspect.
In a fourth aspect, an embodiment of the present disclosure provides a time service apparatus, where the apparatus is located at a base station of a mobile network, and the apparatus includes:
the first determining module is configured to respond to a time service triggering event, and determine the target quantity and the target time interval of the time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
the generation module is configured to generate time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
a first sending module, configured to send a scheduling instruction to one or more terminals within the coverage of the base station through an air interface, so as to notify the terminals to receive a time service signaling on the time frequency resource block;
the second sending module is configured to send the time service signaling to one or more terminals in the coverage area of the base station on the time frequency resource block;
the third sending module is configured to generate and send the next time service signaling when the number of the sent time service signaling does not exceed the target number; and the issuing time interval between the two time service signaling is the target time interval.
In a fifth aspect, an embodiment of the present disclosure provides a time service apparatus, where the apparatus is located at a terminal of a mobile network, the terminal includes a baseband processing chip and a time service chip, and the apparatus includes:
a first receiving module configured to receive a scheduling instruction sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
the second receiving module is configured to receive the time service signaling sent by the base station according to a preset time interval on the time frequency resource block by using the baseband processing chip and forward the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
and the second determining module is configured to obtain second absolute time information according to the received multiple time service signaling by using the time service chip, and adjust the local time of the terminal by using the second absolute time information.
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 time service device is structured to include a memory for storing one or more computer instructions for supporting the time service device to perform the method according to any one of the above aspects, and a processor configured to execute the computer instructions stored in the memory. The time service device can also comprise a communication interface which is used for the time service device to communicate with other equipment or a communication network.
In a sixth aspect, an embodiment of the present disclosure provides an electronic device, including a memory and a processor; wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of any of the above aspects.
In a seventh aspect, the disclosed embodiment provides a computer-readable storage medium for storing computer instructions for any one of the above apparatuses, which contains computer instructions for performing the method according to any one of the above aspects.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the embodiment of the disclosure aims at a wireless time service scene of a mobile network, and realizes absolute time synchronization based on air interface physical layer signals in order to realize low-cost, low-overhead and high-precision wireless time synchronization capability, thereby solving the problems of how to rely on a wireless communication network, issue absolute time information to a terminal through a base station, how to receive the absolute time information by the terminal, and perform time adjustment.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Other features, objects, and advantages of the present disclosure will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a flow chart of a time service method according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram illustrating a mobile network air interface time service architecture according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating an implementation flow in a base station side time service scenario according to an embodiment of the present disclosure;
FIG. 4 shows a flow chart of a time service method according to another embodiment of the disclosure;
FIG. 5 is a schematic diagram illustrating an implementation flow in a terminal-side time service scenario according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device suitable for implementing a time service method according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. Also, for the sake of clarity, parts not relevant to the description of the exemplary embodiments are omitted in the drawings.
In the present disclosure, it is to be understood that terms such as "including" or "having," etc., are intended to indicate the presence of the disclosed features, numbers, steps, behaviors, components, parts, or combinations thereof, and are not intended to preclude the possibility that one or more other features, numbers, steps, behaviors, components, parts, or combinations thereof may be present or added.
It should be further noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As described above, in the conventional wireless communication network, uplink and downlink synchronization during wireless communication between a terminal and a base station are relative time synchronization based on the alignment of radio frame/subframe boundaries, that is, the base station and the terminal only have relative time synchronization capability and cannot perform absolute time service. In addition, the technologies of the related technologies in the aspects of designing base station time synchronization, network time synchronization and the like do not provide how to perform high-precision time service on the terminal in a mobile network wireless scene. The embodiment of the disclosure aims at a wireless time service scene of a mobile network, and realizes absolute time synchronization based on air interface physical layer signals in order to realize low-cost, low-overhead and high-precision wireless time synchronization capability, thereby solving the problems of how to rely on a wireless communication network, issue absolute time information to a terminal through a base station, how to receive the absolute time information by the terminal, and perform time adjustment.
The details of the embodiments of the present disclosure are described in detail below with reference to specific embodiments.
Fig. 1 shows a flow chart of a time service method according to an embodiment of the present disclosure. As shown in fig. 1, the time service method includes the following steps:
in step S101, in response to a time service trigger event, determining a target number and a target time interval of the time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
in step S102, a time service signaling of the physical layer is generated; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
in step S103, sending a scheduling command to one or more terminals within the coverage of the base station through an air interface to notify the terminals to receive a time service signaling on the time frequency resource block;
in step S104, the time service signaling is issued to one or more terminals in the coverage area of the base station on the time frequency resource block;
in step S105, when the number of the time service signaling sent down does not exceed the target number, a next time service signaling is generated and sent down; and the issuing time interval between the two time service signaling is the target time interval.
In this embodiment, the time service method operates on a base station in a mobile network. An air interface connection is established between a base station and one or more terminals within the coverage of the base station in a mobile network, that is, the base station and the terminals communicate through an air interface. Compared with the prior art, the method and the device have the advantages that the capability of issuing the absolute time through the physical layer signaling is added on the base station side; the terminal side outputs physical layer data including SIB (system information block, empty physical layer information) timing signaling and Time Advance (TA) after the baseband processing chip receives and demodulates the data through an air interface physical layer to a timing chip of the terminal through the capability of the open baseband module; the time service chip processes the received physical layer data and outputs the local absolute time information and the frequency reference signal pps of the terminal, and the terminal adjusts the local time of the terminal according to the absolute time information and the frequency reference signal pps output by the time service chip.
Fig. 2 shows a schematic diagram of a mobile network air interface timing service architecture according to an embodiment of the present disclosure. As shown in fig. 2, a base station sends a time service signaling SIB to a terminal UE through an air interface physical layer established between the base station and the terminal UE, a baseband module (including a baseband processing chip) of the terminal UE forwards received physical layer data including the SIB signaling to the time service chip, and the time service chip processes the physical layer data and outputs absolute time information and a frequency reference signal pps.
Fig. 3 is a schematic flow chart of an implementation of a base station side time service scenario according to an embodiment of the present disclosure. As shown in fig. 3, before the base station starts providing the Time service, it synchronizes to a Universal Time Coordinated (UTC) through the GNSS or the network, and configures a Time service parameter; the time service parameters may include, but are not limited to, a time service period Cb, a target number Nb of time service signaling, a time interval Ib between two time service signaling transmissions, and a time frequency resource block Rb used for issuing the time service signaling; according to Cb configured in the time service parameters, the base station starts time service every Cb interval; the base station schedules a series of resource blocks Rb used by the time service signaling to be sent through an air interface physical layer (MAC layer), namely, the base station sends the scheduling signaling to the terminal needing time service through the air interface physical layer so as to inform the terminal that the base station is to use Rb to send the time service signaling. And the base station adopts a 3GPP standard flow to inform the used time frequency resource block to the terminal before sending the time service signaling each time.
Before sending the time service signaling SIB _ t, the base station generates the content of the first absolute time information in the time service signaling SIB _ t by a local hardware clock of the base station (i.e. the local time of the base station, which may be synchronous with UTC), where the value of the content may be the starting point time of the starting time slot of the time service signaling SIB _ t in the transmission process, and the time service signaling further includes a reference SFN number, where the reference SFN number is a system frame number used for transmitting the time service signaling each time the time service is served. After receiving the time service signaling, the terminal can compare the reference SFN with the system frame number of the SIB receiving the time service signaling to determine whether the time service signaling is valid.
The base station determines the target quantity and the transmission interval of the time service signaling SIB _ t to be transmitted for each time service according to Ib and Nb in the configured time service parameters, and circularly transmits the time service signaling to the terminal through an air interface physical layer, wherein the quantity of the time service signaling transmitted in the primary time service is Nb in the time service parameters, and the transmission time interval of two time service signaling in the primary time service is Ib. It should be noted that, in a primary time service, the base station may issue the time signaling to all terminals within the coverage of the base station, or may issue the time signaling to some (one or more) terminals.
The following describes in detail the parameters used by the base station:
cb: and the base station executes the period of the time service process. Namely, providing time service to the terminal in the coverage range once each Cb time;
nb: the base station sends the number of SIB _ t signaling each time when executing the timing process;
SIB _ t: the base station is used for the signaling of an air interface physical layer of time service, and the signaling comprises absolute time information and rSFN information (namely reference SFN for reducing the influence caused by ARQ or HARQ);
rb: the base station transmits the SIB _ t signaling to the base station;
ib: adjacent SIB _ t signaling intervals in each time service process correspond to Rb;
in an optional implementation manner of this embodiment, the time service method further includes the following steps:
receiving configured time service parameters; the time service parameters comprise a time service period, a target number of the time service signaling, a target time interval between the two time service signaling and a time frequency resource block used for transmitting the time service signaling;
and starting a timer so as to generate the time service trigger event once every the time service period.
In this optional implementation manner, a time service parameter may be configured in advance on the base station, and the time service parameter may include, but is not limited to, a time service period, a target number of time service signaling, a target time interval between two time service signaling, and a time frequency resource block used for issuing the time service signaling. The base station may perform a time service at intervals to one or more terminals within its coverage area. The time period for performing the time service can be determined according to the configured time service parameters, that is, the time service period can be configured when the time service parameters are configured, and the base station starts the time service through the time service period. In a time service scene, a timer can be started, the timing time of the timer can be set as a time service period, after one time service period, the timer can trigger a time service trigger event, and the base station starts a time service based on the time service trigger event.
In some embodiments, the time service period may be set to 1 hour. Of course, the length may be longer or shorter according to the actual situation, and is not limited herein.
In some embodiments, the target number Nb of the timing signaling sent to the terminal in one timing service is 500, and the target time interval Ib of two timing signaling is 1 frame length (the specific time length depends on the SCS).
In an optional implementation manner of this embodiment, step S104, that is, the step of sending the time service signaling to one or more terminals in the coverage area of the base station on the time-frequency resource block, further includes the following steps:
the time service signaling is sent to one or more terminals within the range of the base station in a broadcasting mode; alternatively, the first and second electrodes may be,
and respectively transmitting the time service signaling to one or more terminals within the range of the base station in a unicast mode.
In this optional implementation manner, in the one-time service, the base station may broadcast the generated time service signaling to each terminal (which may be all terminals within the coverage of the base station or some terminals) that needs to perform time service in a broadcast manner. In the broadcast mode, the time-frequency resource blocks Rb used by the terminals for all the terminals performing time service are the same and can be preset, and the method can reduce the cost of system scheduling signaling. Therefore, the time service signaling sent to each terminal in this manner may be the same, and the first absolute time information may include a starting time of a time slot in which the time service signaling is located in the transmission process. After receiving the time service signaling, the terminal can determine a time error between the local time of the base station and the local time of the terminal according to the first absolute time information and a time advance TA between the base station and the terminal, which is measured in advance by the base station and sent to the terminal, and then adjust the local time of the terminal according to the time error, so that the base station and the terminal are synchronized in time.
In the primary time service, the base station may send the time service signaling to each terminal (all terminals or some terminals within the coverage of the base station) that needs time service by unicast. In the unicast mode, the terminal can use different time-frequency resource blocks Rb for different terminals, and the use of the time-frequency resource blocks Rb is more flexible in this mode. Therefore, the time service signaling sent to each terminal in this way may be the same or different.
In some embodiments, the first absolute time information in the time service signaling may include a starting time of a time slot in which the time service signaling is located during transmission. After receiving the time service signaling, the terminal may determine second absolute time information synchronized with the base station according to the first absolute time information and a time advance TA between the base station and the terminal, which is measured in advance by the base station and sent to the terminal, and then adjust the time of the terminal according to the second absolute time information, so that the base station and the terminal are synchronized in time. In other embodiments, the first absolute time information in the time service signaling may include a start time of a time slot in which the time service signaling is located in the transmission process plus a time advance between the base station and the terminal. The time advance TA between the base station and the terminal may be a time delay estimation value obtained after the base station blindly detects the uplink preamble of the terminal and without performing granularity processing, and may be obtained by adopting a 3GPP standard flow. After the terminal receives the time service signaling, because the time delay estimation value between the base station and the terminal is considered in the time service signaling, the second absolute time information can be directly obtained through the first absolute time information, and the time of the terminal is further adjusted, so that the base station and the terminal are synchronized in time.
Fig. 4 shows a flow chart of a time service method according to an embodiment of the disclosure. As shown in fig. 4, the time service method includes the following steps:
in step S401, receiving a scheduling command sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
in step S402, the baseband processing chip is used to receive the time service signaling sent by the base station according to a preset time interval on the time frequency resource block, and forward the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
in step S403, the time service chip is used to obtain second absolute time information according to the received multiple time service signaling, and the second absolute time information is used to adjust the local time of the terminal.
In this embodiment, the method is performed at the terminal. As shown in fig. 2, the terminal includes a baseband module and a network time service chip. The baseband module can be implemented by a baseband processing chip conforming to the 3GPP standard, and is configured to receive data from the base station through the antenna and demodulate the received data. In a time service scene, after receiving physical layer data including a time service signaling through an antenna, a baseband module demodulates the physical layer data and directly forwards the physical layer data to a network time service chip, the network time service chip can obtain second absolute time information according to the time service signaling, and a terminal can adjust local time of the terminal according to the second absolute time information output by the network time service chip and a frequency reference signal pps.
For details related to the time service signaling, reference may be made to the description of the time service method performed in the base station, and details are not described herein again.
The reference system frame information in the time service signaling is the system frame number scheduled by the base station for the time service signaling and used for sending and transmitting the time service signaling, under the condition that ARQ/HARQ retransmission does not occur, the reference system frame information is the same as the actual system frame information when the terminal receives the time service signaling, but if ARQ/HARQ retransmission occurs, the time service signaling can be repeatedly sent, so that the actual system frame information actually received by the terminal is not consistent with the reference system frame information in the time service signaling, under the condition that the first absolute time information in the time service signaling is not the initial time when the base station actually sends the time service signaling, after the terminal receives the time service signaling, whether the reference system frame information is consistent with the actual system frame information can be firstly compared, under the consistent condition, the time service signaling is effective, and the terminal can determine the time between the base station and the terminal based on the first absolute time information in the time service signaling If the reference system frame information is inconsistent with the actual system frame information, the time service signaling can be directly considered invalid in one mode, and then the time service signaling is discarded, the time delay between the base station and the terminal is not determined according to the time service signaling, and the time service signaling is not considered when the local time of the terminal is adjusted; in another mode, the time service signaling is still considered to be valid, but the first absolute time information in the time service signaling needs to be adjusted according to the time error between the reference system frame information and the actual system frame information, so that the first absolute time information is the starting time when the base station actually sends the time service signaling.
The baseband module and the time service chip can communicate through interfaces such as a serial port/PCI-E/M.2 and the like. The baseband module may have the capability of modulating and demodulating signals, and the baseband module may adopt a baseband processing chip conforming to the 3GPP standard. The time service chip can comprise a storage unit, a calculation unit and an instruction processing unit.
The base band processing chip waits for receiving the time service signaling sent by the base station after receiving a scheduling instruction which is sent by the base station and comprises time frequency resource block information used for sending the time service signaling, and directly forwards the demodulated physical layer data to the time service chip after receiving the time service signaling. The time service chip can obtain and output second absolute time information according to the first absolute time information in the time service signaling, the time advance between the baseband and the terminal and the like, and the terminal adjusts the time of the terminal according to the second absolute time information output by the time service chip so as to synchronize the time of the terminal with the time of the base station.
Fig. 5 is a schematic diagram illustrating an implementation flow in a terminal side time service scenario according to an embodiment of the present disclosure. As shown in fig. 5, the terminal establishes a connection with the base station through an air interface, the base station estimates a Time Advance (TA) between the base station and the terminal according to a standard flow of 3GPP in real Time, and sends the Time Advance to a baseband processing chip of the terminal through the air interface, and the Time Advance received by the baseband processing chip each Time is forwarded to a Time service chip. When the terminal needs to perform TA adjustment again, such as base station switching, the terminal informs the time service chip to clear the stored TA.
Before time service begins, corresponding parameters can be configured for the time service chip, the configured parameters can determine a mode of receiving the time service by the terminal, and the configured parameters can include the following parameters:
nu: receiving the total amount of the effective time service signaling SIB _ t;
th 0: can be understood as a tolerance threshold of channel delay jitter in a short time; the base station sends a plurality of time service signaling to the terminal in one time service, and the sending time interval between each time service signaling is fixed; after the time service chip processes the received time service signaling, if the time delay adjustment value of the subsequent time service signaling relative to the first time service signaling exceeds Th0, the time delay jitter may be too large due to the error of the first time delay obtained based on the first time service signaling or the instability of the current channel, and the first time delay is not suitable for the time service, so the time service can be terminated, and the time service signaling can be received again;
th 1: another tolerance threshold for channel delay jitter can be understood as a short time; the base station sends a plurality of time service signaling to the terminal in one time service, and the sending time interval between each time service signaling is fixed; after the time service chip processes the received time service signaling, if the time delay adjustment value of the subsequent time service signaling relative to the first time service signaling exceeds Th1, the channel may be unstable temporarily and cause large time delay jitter, so the time service may be suspended, and the current time service signaling is discarded, and the next received time service signaling is processed continuously.
In some embodiments, the parameters may be configured to: nu 150; th0 ═ 50 μ s; th1 ═ 10 μ s.
After receiving the scheduling instruction sent by the base station, the terminal can determine, through the scheduling instruction, that the base station will send the time service signaling on the time-frequency resource block Rb included in the scheduling instruction. Therefore, the terminal can receive and demodulate data including the time service signaling on the corresponding time frequency resource block by using the baseband processing chip, and send the content, TA and the system frame number SFN receiving the time service signaling in the time service signaling to the time service chip; the time service chip can obtain second absolute time information and a frequency reference signal pps according to the content, the TA, the system frame number SFN and the like in the time service signaling, and the local time of the terminal synchronous with the base station can be obtained through the second absolute time information and the frequency reference signal pps.
Because the time service signaling is air interface physical layer signaling, the baseband processing chip demodulates the received physical layer data including the time service signaling and then directly forwards the demodulated data to the time service chip.
In an optional implementation manner of this embodiment, the time service method may further include:
and receiving the time lead sent by the base station through an air interface by using the baseband processing chip, and sending all the received time lead to the authorization chip.
In this optional implementation, the base station may measure a timing advance TA between the base station and the terminal in a manner specified in a 3GPP standard flow, and send the measured TA to the terminal. The baseband processing chip on the terminal forwards the TA to the time service chip, and the time service chip stores the TA received each time in the storage unit. When the time service chip determines the second absolute time information according to the time service signaling, the second absolute time information can be finally obtained by considering the time delay from the base station to the terminal of the time service signaling determined according to the TA on the basis of the first absolute time information in the time service signaling, so that the local time of the terminal obtained by adjusting according to the second absolute time information is synchronous with the base station.
In an optional implementation manner of this embodiment, the step of obtaining, by using the time service chip in step S403, second absolute time information according to the received multiple time service signaling further includes the following steps:
and the time service chip calculates and obtains a time delay adjustment value of each time service signaling at least according to the first absolute time and the time advance in the time service signaling, and calculates and obtains second absolute time information according to the time delay adjustment value.
In the optional implementation manner, the first absolute time information included in the time service signaling is obtained from the local time of the base station when the time service signaling is generated, when the time service signaling is sent from the base station to the terminal, there is a transmission delay, and the transmission delay is determined by the time advance TA; therefore, when each time service signaling is obtained by the time service chip, a time delay adjustment value exists between the time service signaling and the local time of the terminal, and the time delay adjustment value can be obtained by at least first absolute time, time advance and the like. After the time service chip obtains a plurality of time service signaling sent according to the target time interval, a relatively accurate time delay adjustment value can be obtained by accumulating the time delay adjustment values corresponding to each time service signaling and averaging, and then the time of the terminal can be adjusted according to the finally obtained time delay adjustment value and the first absolute time, so that the terminal and the base station can be synchronized in time.
In some embodiments, the time service chip may calculate a delay adjustment value between the base station and the terminal according to each time service signaling, and further obtain an average value of the delay adjustment values corresponding to each time service signaling, and adjust the time of the terminal according to the average value.
The time delay adjustment value between the base station and the terminal can be calculated as follows:
and the time delay adjustment value is the first absolute time in the terminal reference time-time service signaling-uplink time advance-hardware transmission time delay.
The terminal reference time may be 0, or may be a terminal local time obtained according to a local timestamp output by a clock unit on the terminal, where the terminal local time is a current time when the time service chip processes the first time service signaling. When the reference time of the terminal is 0, the time service chip finally outputs absolute time information which can be directly used for adjusting the time of the terminal so that the time of the terminal can be synchronous with the base station; when the reference time of the terminal is the local time of the terminal, the time service chip finally outputs a time adjustment quantity, and the local time of the terminal is adjusted by utilizing the time adjustment quantity, so that the time of the terminal can be synchronous with the base station; the first absolute time is absolute time obtained by a time stamp of a local clock of the base station when the base station sends the time service signaling; the uplink time advance is the transmission delay from the base station to the terminal, is measured by the base station and is sent to the terminal; the hardware transmission delay is the time consumed by the baseband processing chip of the terminal for receiving the time service signaling and transmitting the time service signaling to the time service chip, and the time service chip processes the time service signaling to the current node, and the hardware transmission delay can be obtained by pre-measuring.
According to one embodiment of the present disclosure, a time service system includes: a base station and one or more terminals within the coverage of the base station;
the base station transmits a time service signaling to the terminal through a time service method executed on the base station;
the terminal comprises a baseband processing chip and a time service chip, and local time of the terminal is adjusted through a time service method executed on the terminal.
The details of the present embodiment may be referred to the description of the time service method executed in the base station and the time service method executed in the terminal, and are not limited herein.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods.
According to the time service device of one embodiment of the present disclosure, the time service device may be implemented as a part or all of an electronic device by software, hardware, or a combination of both. The time service device comprises:
the first determining module is configured to respond to a time service triggering event, and determine the target quantity and the target time interval of the time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
the generation module is configured to generate time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
a first sending module, configured to send a scheduling instruction to one or more terminals within the coverage of the base station through an air interface, so as to notify the terminals to receive a time service signaling on the time frequency resource block;
the second sending module is configured to send the time service signaling to one or more terminals in the coverage area of the base station on the time frequency resource block;
the third sending module is configured to generate and send the next time service signaling when the number of the sent time service signaling does not exceed the target number; and the issuing time interval between the two time service signaling is the target time interval.
The time service device in this embodiment corresponds to the time service method executed on the base station, and specific details may be described in the description of the time service method executed on the base station, which is not described herein again.
According to another embodiment of the time service device of the present disclosure, the time service device may be implemented as part or all of an electronic device by software, hardware, or a combination of both. The time service device comprises:
a first receiving module configured to receive a scheduling instruction sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
the second receiving module is configured to receive the time service signaling sent by the base station according to a preset time interval on the time frequency resource block by using the baseband processing chip and forward the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
and the second determining module is configured to obtain second absolute time information according to the received multiple time service signaling by using the time service chip, and adjust the local time of the terminal by using the second absolute time information.
The time service device in this embodiment corresponds to the time service method executed on the terminal, and specific details may be described in the description of the time service method executed on the terminal, which is not described herein again.
Fig. 6 is a schematic structural diagram of an electronic device suitable for implementing a time service method according to an embodiment of the present disclosure.
As shown in FIG. 6, electronic device 600 includes a processing unit 601 that may be implemented as a CPU, GPU, FPAG, NPU, or other processing unit. The processing unit 601 may perform various processes in the embodiments of any one of the above-described methods of the present disclosure according to a program stored in a Read Only Memory (ROM)602 or a program loaded from a storage section 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data necessary for the operation of the electronic apparatus 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output portion 607 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The driver 610 is also connected to the I/O interface 605 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that a computer program read out therefrom is mounted in the storage section 608 as necessary.
In particular, according to embodiments of the present disclosure, any of the methods described above with reference to embodiments of the present disclosure may be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a medium readable thereby, the computer program comprising program code for performing any of the methods of the embodiments of the present disclosure. In such embodiments, the computer program may be downloaded and installed from a network through the communication section 609, and/or installed from the removable medium 611.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules described in the embodiments of the present disclosure may be implemented by software or hardware. The units or modules described may also be provided in a processor, and the names of the units or modules do not in some cases constitute a limitation of the units or modules themselves.
As another aspect, the present disclosure also provides a computer-readable storage medium, which may be the computer-readable storage medium included in the apparatus in the above-described embodiment; or it may be a separate computer readable storage medium not incorporated into the device. The computer readable storage medium stores one or more programs for use by one or more processors in performing the methods described in the present disclosure.
The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the present disclosure is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the inventive concept. For example, the above features and (but not limited to) the features disclosed in this disclosure having similar functions are replaced with each other to form the technical solution.
Claims (10)
1. A time service method, wherein the method is executed on a base station in a mobile network, and comprises the following steps:
in response to a time service trigger event, determining the target number and the target time interval of time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
sending a scheduling instruction to one or more terminals within the coverage of the base station through an air interface so as to inform the terminals of receiving time service signaling on the time frequency resource block;
the time service signaling is sent to one or more terminals within the coverage range of the base station on the time frequency resource block;
when the number of the issued time service signaling does not exceed the target number, generating and issuing the next time service signaling; and the issuing time interval between the two time service signaling is the target time interval.
2. The method of claim 1, further comprising:
receiving configured time service parameters; the time service parameters comprise a time service period, a target number of the time service signaling, a target time interval between the two time service signaling and a time frequency resource block used for transmitting the time service signaling;
and starting a timer so as to generate the time service trigger event once every the time service period.
3. The method according to any of claims 1-2, wherein the issuing of the timing signaling to one or more of the terminals within the coverage of the base station on the time-frequency resource block comprises:
the time service signaling is sent to one or more terminals within the range of the base station in a broadcasting mode; alternatively, the first and second electrodes may be,
and respectively transmitting the time service signaling to one or more terminals within the range of the base station in a unicast mode.
4. A time service method is executed on a terminal of a mobile network, wherein the terminal comprises a baseband processing chip and a time service chip, and the method comprises the following steps:
receiving a scheduling instruction sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
receiving the time service signaling sent by the base station according to a preset time interval on the time frequency resource block by using the baseband processing chip, and forwarding the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
and obtaining second absolute time information by using the time service chip according to the received multiple time service signaling, and adjusting the local time of the terminal by using the second absolute time information.
5. The method of claim 4, further comprising:
and receiving the time advance sent by the base station through an air interface by using the baseband processing chip, and sending all the received time advance to the time service chip.
6. The method of claim 5, wherein the obtaining, by the time service chip, second absolute time information according to the received plurality of time service signaling comprises:
and the time service chip calculates and obtains a time delay adjustment value of each time service signaling at least according to the local time of the terminal, the first absolute time in the time service signaling and the time advance, and calculates and obtains the second absolute time information according to the time delay adjustment value.
7. A time service system, comprising: a base station and one or more terminals within the coverage of the base station;
the base station transmits a time service signaling to the terminal by the method of any one of claims 1 to 3;
the terminal comprises a baseband processing chip and a time service chip, and the local time of the terminal is adjusted by the method of any one of claims 4 to 6.
8. A time service apparatus, wherein the apparatus is located at a base station of a mobile network, comprising:
the first determining module is configured to respond to a time service triggering event, and determine the target quantity and the target time interval of time service signaling and a time frequency resource block used for issuing the time service signaling according to a pre-configured time service parameter;
the generation module is configured to generate time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on local time of a base station and used for transmitting the time service signaling and reference system frame information used for transmitting the time service signaling;
a first sending module, configured to send a scheduling instruction to one or more terminals within the coverage of the base station through an air interface, so as to notify the terminals to receive a time service signaling on the time frequency resource block;
the second sending module is configured to send the time service signaling to one or more terminals in the coverage area of the base station on the time frequency resource block;
the third sending module is configured to generate and send the next time service signaling when the number of the sent time service signaling does not exceed the target number; and the issuing time interval between the two time service signaling is the target time interval.
9. A time service device is located at a terminal of a mobile network, the terminal comprises a baseband processing chip and a time service chip, and the time service device comprises:
a first receiving module configured to receive a scheduling instruction sent by a base station from an air interface by using the baseband processing chip; the scheduling instruction comprises information of a time-frequency resource block for receiving time service signaling of a physical layer;
the second receiving module is configured to receive the time service signaling sent by the base station according to a preset time interval on the time frequency resource block by using the baseband processing chip and forward the received time service signaling to the time service chip; the time service signaling comprises first absolute time information for transmitting the time service signaling and reference system frame information for transmitting the time service signaling, wherein the first absolute time information is generated based on local time of a base station;
and the second determining module is configured to obtain second absolute time information according to the received multiple time service signaling by using the time service chip, and adjust the local time of the terminal by using the second absolute time information.
10. An electronic device, comprising a memory and a processor; wherein the content of the first and second substances,
the memory is to store one or more computer instructions, wherein the one or more computer instructions are to be executed by the processor to implement the method of any one of claims 1-6.
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