CN111294133B - Method and device for transmitting and receiving time service signaling and electronic equipment - Google Patents
Method and device for transmitting and receiving time service signaling and electronic equipment Download PDFInfo
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- CN111294133B CN111294133B CN202010079787.0A CN202010079787A CN111294133B CN 111294133 B CN111294133 B CN 111294133B CN 202010079787 A CN202010079787 A CN 202010079787A CN 111294133 B CN111294133 B CN 111294133B
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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
- 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
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Abstract
The embodiment of the disclosure discloses a method, a device and an electronic device for transmitting and receiving time service signaling, wherein the method comprises the following steps: generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling; and transmitting the time service signaling to one or more terminals within the coverage range of the base station through an air interface. The technical scheme can realize absolute time synchronization based on air interface physical layer signals aiming at a mobile network wireless time service scene and aiming at realizing wireless time synchronization capability with low cost, low expenditure and high precision, and solves 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, adjust time and the like.
Description
Technical Field
The disclosure relates to the technical field of wireless communication, in particular to a method, a device and an electronic device for transmitting and receiving time service signaling.
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 method and a device for transmitting and receiving time service signaling and electronic equipment.
In a first aspect, an embodiment of the present disclosure provides a transmission method of a time service signaling, where the method is executed on a base station in a mobile network, and includes:
generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
and transmitting the time service signaling to one or more terminals within the coverage range of the base station through an air interface.
Wherein, sending the time service signaling to one or more terminals in the coverage area of the base station through an air interface comprises:
and transmitting the time service signaling to one or more terminals within the range of the base station in a broadcasting mode.
The first absolute time information comprises the starting time of the time slot of the time service signaling in the transmission process.
Wherein, sending the time service signaling to one or more terminals in the coverage area of the base station through an air interface comprises:
and respectively transmitting the time service signaling to one or more terminals within the range of the base station in a unicast mode.
The first absolute time information includes a start time of a time slot in which the time service signaling is located in a transmission process, or the first absolute time information includes the start time of the time slot in which the time service signaling is located in the transmission process plus a time advance of the base station and the terminal.
In a second aspect, a method for receiving a time service signaling is provided in an embodiment of the present disclosure, where the method is executed on a terminal in a mobile network, and includes:
receiving a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is invalid; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame information.
The first absolute time is the starting time of the time slot of the time service signaling in the transmission process, or the first absolute time is the sum of the starting time of the time slot of the time service signaling in the transmission process and the time advance of the terminal.
In a third aspect, an embodiment of the present disclosure provides an apparatus for transmitting timing signaling, where the apparatus is located in a base station in a mobile network, and the apparatus includes:
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 the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
and the issuing module is configured to issue the time service signaling to one or more terminals within the coverage range of the base station through an air interface.
In a fourth aspect, an embodiment of the present disclosure provides a device for receiving a time service signaling, where the device is located in a terminal in a mobile network, and the device includes:
the receiving module is configured to receive a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
the determining module is configured to determine that the time service signaling is invalid when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame 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 structure of any one of the above apparatuses includes a memory for storing one or more computer instructions that support any one of the above apparatuses to perform the method of any one of the above aspects, and a processor configured to execute the computer instructions stored in the memory. Any of the above-described apparatuses may further include a communication interface for the any of the above-described apparatuses to communicate with other devices or a communication network.
In a fifth 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 sixth aspect, the disclosed embodiments provide a computer-readable storage medium for storing computer instructions for use by any of the above-mentioned apparatuses, which contains computer instructions for performing the method according to any of the above-mentioned 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 shows a flowchart of a transmission method of time service signaling according to an embodiment of the present disclosure;
fig. 2 shows a flowchart of a receiving method of time service signaling according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of an electronic device suitable for implementing a transmission or reception method of time service signaling 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 flowchart of a transmission method of time service signaling according to an embodiment of the present disclosure. As shown in fig. 1, the transmission method of the time service signaling includes the following steps:
in step S101, a time service signaling of the physical layer is generated; the time service signaling comprises first absolute time information which is generated based on the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
in step S102, the time service signaling is sent to one or more terminals in the coverage area of the base station through an air interface.
In this embodiment, the transmission method of the time service signaling is executed 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 the 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 physical layer data through the air interface physical layer to the 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.
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 actual 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, 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: the adjacent SIB _ t signaling interval in each time service process corresponds to Rb.
In an optional implementation manner of this embodiment, step S102, namely, the step of sending the time service signaling to one or more terminals within the coverage area of the base station over an air interface, further includes the following steps:
and transmitting the time service signaling to one or more terminals within the range of the base station in a broadcasting 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 the time delay between the base station and the terminal according to the first absolute time information and the time advance TA between the base station and the terminal, which is measured in advance by the base station and sent to the terminal, so as to obtain a second absolute time according to the time delay and the first absolute time, and adjust the local time of the terminal according to the second absolute time, so that the base station and the terminal are synchronized in time.
In an optional implementation manner of this embodiment, step S102, namely, the step of sending the time service signaling to one or more terminals within the coverage area of the base station over an air interface, further includes the following steps:
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 a time service, the base station may also send a 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 separately through 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 can determine the time delay between the base station and the terminal according to the first absolute time information and the time advance TA between the base station and the terminal, which is measured in advance by the base station and sent to the terminal, so as to obtain a second absolute time according to the time delay and the first absolute time, and adjust the local time of the terminal according to the second absolute time, 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 local time of the terminal can be directly adjusted through the first absolute time information, so that the base station and the terminal are synchronous in time.
The embodiment of the disclosure can realize the wireless time synchronization capability with low cost, low overhead and high precision aiming at the wireless time service scene of the mobile network through the time service signaling, and realize the absolute time synchronization based on the air interface physical layer signal.
Fig. 2 shows a flowchart of a method for receiving time service signaling according to an embodiment of the present disclosure. As shown in fig. 2, the method for receiving the time service signaling includes the following steps:
in step S201, receiving a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
in step S202, when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is invalid; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame information.
In this embodiment, the receiving method of the time service signaling points to the terminal. The terminal can comprise 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 above description of the transmission method of the time service signaling executed 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 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 local time of the terminal according to the second absolute time information output by the time service chip so as to synchronize the local time of the terminal with the local time of the base station.
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 some embodiments, in a primary time service, a base station may broadcast a generated time service signaling to each terminal (which may be all terminals or some terminals within a coverage area of the base station) 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 may determine a time delay between the base station and 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 further adjust a local time of the terminal according to the time delay and the first absolute time information, so that the base station and the terminal are synchronized in time.
In other embodiments, in a one-time service, the base station may also send the time service signaling to each terminal (all terminals or some terminals within the coverage of the base station) that needs to perform time service separately through 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 a time delay between the base station and 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 further adjust a local time of the terminal according to the time delay and the first 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 local time of the terminal can be directly adjusted through the first absolute time information, so that the base station and the terminal are synchronized in time.
The base station may measure a timing advance TA with the terminal in a manner specified in a 3GPP standard procedure, 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 local time of the base station.
In an optional implementation manner of this embodiment, the terminal calculates a delay adjustment value of each time service signaling according to at least the first absolute time information and the time advance in the time service signaling, and calculates the second absolute time information according to the 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 in the terminal, because of the time consumed in the transmission process of the time service signaling, a time delay adjustment value exists, and the time delay adjustment value can be obtained at least according to the first absolute time, the 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 local 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 terminal may calculate a delay adjustment value between the base station and the terminal according to each time service signaling, further obtain an average value of the delay adjustment values corresponding to each time service signaling, and adjust the local 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; and 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.
Table 1 below gives one possible structural design of the physical layer time service signaling:
TABLE 1
In some embodiments, timeInfoUTC employs a standard TOD format (year-month-day: minutes: microseconds, nanoseconds); in other embodiments, the timeInfoUTC is in the format of nanoseconds elapsed relative to 1 month, 1 day 00:00:00 of 1900.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods.
According to the transmission device of the time service signaling in one embodiment of the present disclosure, the device may be implemented as part or all of an electronic device by software, hardware, or a combination of both. The transmission device of the time service signaling comprises:
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 the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
and the issuing module is configured to issue the time service signaling to one or more terminals within the coverage range of the base station through an air interface.
The transmission apparatus of the time service signaling in this embodiment corresponds to the transmission method of the time service signaling in the above embodiment, and specific details may be referred to the above description of the transmission method of the time service signaling, and are not described herein again.
According to the receiving device of the time service signaling in one embodiment of the present disclosure, the device may be implemented as part or all of an electronic device by software, hardware, or a combination of both. The receiving device of the time service signaling comprises:
the receiving module is configured to receive a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
the determining module is configured to determine that the time service signaling is invalid when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame information.
The receiving apparatus of the time service signaling in this embodiment corresponds to and is consistent with the receiving method of the time service signaling in the above embodiment, and specific details may refer to the description of the receiving method of the time service signaling, which is not described herein again.
Fig. 3 is a schematic structural diagram of an electronic device suitable for implementing a transmission or reception method of time service signaling according to an embodiment of the disclosure.
As shown in FIG. 3, electronic device 300 includes processing unit 301 that may be implemented as a CPU, GPU, FPAG, NPU, or other processing unit. The processing unit 301 may execute various processes in the embodiment of any one of the methods described above of the present disclosure according to a program stored in a Read Only Memory (ROM) 302 or a program loaded from a storage section 308 into a Random Access Memory (RAM) 303. In the RAM303, various programs and data necessary for the operation of the electronic apparatus 300 are also stored. The CPU301, ROM302, and RAM303 are connected to each other via a bus 304. An input/output (I/O) interface 305 is also connected to bus 304.
The following components are connected to the I/O interface 305: an input portion 306 including a keyboard, a mouse, and the like; an output section 307 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 308 including a hard disk and the like; and a communication section 309 including a network interface card such as a LAN card, a modem, or the like. The communication section 309 performs communication processing via a network such as the internet. A drive 310 is also connected to the I/O interface 305 as needed. A removable medium 311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 310 as necessary, so that a computer program read out therefrom is mounted into the storage section 308 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 an embodiment, the computer program may be downloaded and installed from a network through the communication section 309, and/or installed from the removable medium 311.
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 transmission method of time service signaling, wherein the method is executed on a base station in a mobile network, and comprises the following steps:
sending a scheduling instruction to one or more terminals within the coverage of the base station; the scheduling instruction comprises information of a time-frequency resource block for sending a time service signaling;
generating a time service signaling of a physical layer; the time service signaling comprises first absolute time information which is generated based on the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
transmitting the time service signaling to one or more terminals within the coverage range of the base station through an air interface; the terminal obtains a second absolute time by using the first absolute time information in the time service signaling and the time delay between the terminal and the base station, and adjusts the local time of the terminal according to the second absolute time, so that the terminal and the base station are synchronous in time.
2. The method of claim 1, wherein issuing the timing signaling over an air interface to one or more terminals within the coverage of the base station comprises:
and transmitting the time service signaling to one or more terminals within the range of the base station in a broadcasting mode.
3. The method of claim 2, wherein the first absolute time information comprises a start time of a time slot in which the time service signaling is located during transmission.
4. The method of claim 1, wherein issuing the timing signaling over an air interface to one or more terminals within the coverage of the base station comprises:
and respectively transmitting the time service signaling to one or more terminals within the range of the base station in a unicast mode.
5. The method according to claim 4, wherein the first absolute time information includes a start time of a time slot in which the timing signaling is located in a transmission process, or the first absolute time information includes a start time of the time slot in which the timing signaling is located in the transmission process plus a time advance of the base station and the terminal.
6. A receiving method of time service signaling, wherein the method is executed on a terminal in a mobile network, and comprises the following steps:
receiving a scheduling instruction sent by a base station; the scheduling instruction comprises information of a time-frequency resource block for sending a time service signaling;
receiving a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is invalid; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame information;
and acquiring second absolute time based on the first absolute time information and the time delay between the terminal and the base station, and adjusting the local time of the terminal according to the second absolute time so that the terminal and the base station are synchronized in time.
7. The method of claim 6, wherein the first absolute time is a starting time of a time slot in which the timing signaling is located in a transmission process, or the first absolute time is a sum of the starting time of the time slot in which the timing signaling is located and a time advance of the terminal in the transmission process.
8. An apparatus for transmitting timing signaling, wherein the apparatus is located at a base station in a mobile network, comprising:
a transmitting module configured to transmit a scheduling instruction to one or more terminals within the coverage of the base station; the scheduling instruction comprises information of a time-frequency resource block for sending a time service signaling;
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 the local time of the base station and used for transmitting the time service signaling and reference system frame information used for issuing the time service signaling;
the issuing module is configured to issue the time service signaling to one or more terminals within the coverage range of the base station through an air interface; the terminal obtains a second absolute time by using the first absolute time information in the time service signaling and the time delay between the terminal and the base station, and adjusts the local time of the terminal according to the second absolute time, so that the terminal and the base station are synchronous in time.
9. A receiving device of time service signaling, wherein the device is located at a terminal in a mobile network, and comprises:
the instruction receiving module is configured to receive a scheduling instruction sent by a base station; the scheduling instruction comprises information of a time-frequency resource block for sending a time service signaling;
the receiving module is configured to receive a time service signaling sent by a base station according to a preset time interval from an air interface established with the base station; 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 the local time of the base station;
the determining module is configured to determine that the time service signaling is invalid when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal; or when the reference system frame information is inconsistent with the actual system frame information of the time service signaling received by the terminal, determining that the time service signaling is effective, and adjusting the first absolute time information according to the time error between the reference system frame information and the actual system frame information;
a synchronization module configured to obtain a second absolute time based on the first absolute time information and a delay between the terminal and the base station, and adjust a local time of the terminal according to the second absolute time, so that the terminal and the base station are synchronized in time.
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 1-7.
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