Time synchronization method and device of deterministic network, storage medium and product

Abstract

The invention discloses a time synchronization method and device of a deterministic network, a storage medium and a product, and relates to the technical field of wireless communication, and the method comprises the steps: obtaining the updated access network time when a base station side detects that the access network time of the deterministic network is updated; and when the updated access network time does not reach the periodic triggering time and the system message request message and / or the time source state indication information sent by the terminal side meet the on-demand triggering condition, the on-demand triggering scheduling strategy is used as a time synchronization information scheduling strategy to distribute the updated access network time to the terminal side. And the terminal side carries out time synchronization according to the updated access network time. According to the method and the device, the on-demand triggering condition is judged to be met, and the on-demand triggering scheduling strategy is taken as the time synchronization information scheduling strategy when the on-demand triggering condition is met, so that efficient resource allocation can be realized, more accurate time synchronization requirements can be adapted, and the problem that high-precision time synchronization cannot be realized by an existing periodic sending scheme is solved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a time synchronization method, device, storage medium and product for a deterministic network. Background Art

[0002] Deterministic networks provide deterministic guarantees for the services carried within a network domain. Deterministic network technology can strictly guarantee indicators such as latency, jitter, bandwidth and reliability, and is a key technology in the field of industrial production. 5G has introduced various enhanced technologies to support deterministic networks. The premise for the realization of end-to-end time synchronization in deterministic networks is the realization of the time synchronization system of the 5G access network (5G time domain). The time distribution function of the 5G access network, that is, the distribution of time information of the 5G internal system master clock, is the basis for end-to-end time synchronization.

[0003] The time synchronization of the current deterministic network 5G access network has the following problems: The distribution process of the 5G access network time synchronization information needs to occupy the air interface scheduling resources. Under the existing mechanism, in order to ensure the reliability and timeliness of transmission and improve the accuracy of time synchronization, more scheduling resources must be occupied, which affects the scheduling of normal services. In addition, due to the inconsistency of hardware performance on the base station side and the terminal side, for example, the oscillation frequency of the crystal oscillator on both sides deviates due to high temperature, aging or other factors, resulting in a decrease in the accuracy of time synchronization. In this case, the terminal needs to obtain time synchronization information more promptly. The current industry's 5G access network time synchronization information distribution scheme is based on the periodic transmission of conventional system messages. Due to the uncertainty caused by the wireless environment, scheduling mechanism and hardware performance, conventional schemes cannot achieve efficient scheduling and high-precision time synchronization. Summary of the invention

[0004] The main purpose of the present application is to provide a method, device, storage medium and product for time synchronization of a deterministic network, aiming to solve the technical problem of low time synchronization accuracy of the access network of the deterministic network in the existing distribution scheme.

[0005] To achieve the above object, the present application proposes a time synchronization method for a deterministic network, the method being applied to a base station side, the method comprising:

[0006] When it is detected that the access network time of the deterministic network is updated, the updated access network time is obtained;

[0007] When the access network time after the update does not reach the periodic trigger time, and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling policy is used as the time synchronization information scheduling policy;

[0008] The updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time.

[0009] In one embodiment, when the access network time after the update does not reach the periodic trigger time, and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, before the step of using the on-demand trigger scheduling policy as the time synchronization information scheduling policy, it also includes:

[0010] Receiving a system message request message sent by the terminal side, and obtaining time status feedback information of the terminal side from the system message request message;

[0011] Detect the time source status on the base station side and obtain time source status indication information;

[0012] Determine whether the time source status indication information and / or the time status feedback information meets an on-demand triggering condition.

[0013] In one embodiment, the value of the time state feedback information includes a highest precision value, an intermediate precision value or a lowest precision value, and the value of the time source state indication information is 0 or 1; the on-demand trigger condition is any one of the first condition, the second condition and the third condition; wherein, the first condition is that the value of the time source state indication information is 0; the second condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is an intermediate precision value; the third condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is the lowest precision value.

[0014] In one embodiment, the on-demand triggered scheduling strategy includes a first distribution strategy, a second distribution strategy, and a third distribution strategy, wherein the first distribution strategy is to distribute the updated access network time to the terminal side with a first preset number of times, the second distribution strategy is to distribute the updated access network time to the terminal side with a second preset number of times, and the third distribution strategy is to distribute the updated access network time to the terminal side with a third preset number of times; wherein the preset number of times is the scheduling number of the access network time within the system message scheduling window, the first preset number of times is greater than the second preset number of times, and the second preset number of times is greater than the third preset number of times;

[0015] The step of using the on-demand trigger scheduling strategy as the time synchronization information scheduling strategy when the access network time after the update does not reach the periodic trigger time and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition includes:

[0016] When the access network time after the update does not reach the periodic trigger time and the time source status indication information meets the first condition, using the first distribution strategy as the time synchronization information scheduling strategy;

[0017] or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the second condition, using the second distribution strategy as the time synchronization information scheduling strategy;

[0018] Or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the third condition, the third distribution strategy is used as the time synchronization information scheduling strategy.

[0019] In one embodiment, when the access network time after the update does not reach the periodic trigger time, and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, after the step of using the on-demand trigger scheduling policy as the time synchronization information scheduling policy, it also includes:

[0020] When the access network time after the update meets the periodic trigger condition, determine the time synchronization accuracy level, and determine the broadcast period according to the time synchronization accuracy level, wherein the periodic trigger condition is any one of the fourth condition and the fifth condition; the fourth condition is that the access network time after the update reaches the periodic trigger time, and the fifth condition is that the access network time after the update does not reach the periodic trigger time, and the system message request message and the time source status indication information sent by the terminal side do not meet the on-demand trigger condition;

[0021] A periodic trigger scheduling strategy is used as a time synchronization information scheduling strategy, and the periodic trigger scheduling strategy is to distribute the updated access network time to the terminal side according to the broadcast period.

[0022] In one embodiment, the step of distributing the updated access network time to the terminal side according to the time synchronization information scheduling policy includes:

[0023] Acquire a preset modulation and coding strategy pre-estimated through a downlink channel;

[0024] Determine the final modulation and coding strategy based on the preset modulation and coding strategy, time synchronization accuracy level and network management configurable parameters;

[0025] Determining the number of resource blocks to be scheduled according to the final modulation and coding strategy and the transport block size requirement of the time information;

[0026] The updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy and the number of scheduled resource blocks.

[0027] In addition, to achieve the above object, the present invention also proposes a time synchronization method for a deterministic network, which is applied to a terminal side. The time synchronization method for a deterministic network includes:

[0028] Detect timing related information, and dynamically adjust the real-time status of time and frequency synchronization according to the service layer feedback information and the timing related information, and obtain time status feedback information on the terminal side;

[0029] Encapsulating the time state feedback information into a system message request message, and sending the system message request message to the base station side;

[0030] Receive the updated access network time fed back by the base station side according to the system message request message, and perform time synchronization according to the updated access network time.

[0031] In addition, to achieve the above-mentioned purpose, the present application also proposes a time synchronization device for a deterministic network, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the time synchronization method for a deterministic network as described above.

[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the time synchronization method of the deterministic network as described above are implemented.

[0033] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the time synchronization method of the deterministic network as described above are implemented.

[0034] The present application provides a method for time synchronization of a deterministic network, wherein when the base station side detects that the access network time of the deterministic network is updated, the updated access network time is obtained; when the updated access network time does not reach the periodic trigger time, and the system message request message and / or time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy; the updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time. The present application can achieve efficient resource allocation by judging whether the on-demand trigger condition is met, and when the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy, it can adapt to more accurate time synchronization requirements, thereby solving the problem that the existing system message periodic sending scheme cannot achieve high-precision time synchronization. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 A flowchart of a method for time synchronization in a deterministic network according to an embodiment of the present invention;

[0038] Figure 2 A schematic diagram of a time synchronization device for a deterministic network of the present application;

[0039] Figure 3 This is a schematic diagram of the overall process of the time synchronization method of the deterministic network of the present application;

[0040] Figure 4 A flowchart of a second embodiment of a method for time synchronization in a deterministic network according to the present invention;

[0041] Figure 5 A schematic diagram of a flow chart of determining trigger conditions of a time synchronization method for a deterministic network of the present application;

[0042] Figure 6 A schematic diagram of a process for determining the number of scheduling times in an on-demand triggered scheduling strategy in a time synchronization method for a deterministic network of the present application;

[0043] Figure 7 A flowchart of a method for time synchronization in a deterministic network according to Embodiment 3 of the present invention;

[0044] Figure 8 A schematic diagram of the device structure of the hardware operating environment involved in the time synchronization method for a deterministic network in an embodiment of the present application.

[0045] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0047] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0048] The main solution of the embodiment of the present application is: when the base station side detects that the access network time of the deterministic network is updated, it obtains the updated access network time; when the updated access network time does not reach the periodic trigger time, and the system message request message and / or time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy; according to the time synchronization information scheduling strategy, the updated access network time is distributed to the terminal side, so that the terminal side performs time synchronization according to the updated access network time.

[0049] The time synchronization of the 5G access network of the deterministic network in the prior art has the following problems: the distribution process of the 5G access network time synchronization information needs to occupy the air interface scheduling resources. Under the existing mechanism, in order to ensure the reliability and timeliness of transmission and improve the accuracy of time synchronization, more scheduling resources must be occupied, which affects the scheduling of normal services. In addition, due to the inconsistency of hardware performance on the base station side and the terminal side, for example, the oscillation frequency of the crystal oscillator on both sides deviates due to high temperature, aging or other factors, resulting in a decrease in the accuracy of time synchronization. In this case, the terminal needs to obtain time synchronization information more promptly. The current distribution scheme of 5G access network time synchronization information in the industry is based on the periodic transmission of conventional system messages. Due to the uncertainty caused by the wireless environment, scheduling mechanism and hardware performance, the conventional scheme cannot achieve efficient scheduling and high-precision time synchronization.

[0050] The present application provides a solution, in which the base station side obtains the updated access network time when detecting the access network time update of the deterministic network; when the updated access network time does not reach the periodic trigger time, and the system message request message and / or time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy; the updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time. The present application can achieve efficient resource allocation by judging whether the on-demand trigger condition is met, and when the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy, it can adapt to more accurate time synchronization requirements, thereby solving the problem that the existing system message periodic sending scheme cannot achieve high-precision time synchronization.

[0051] It should be noted that the execution subject of the method of this embodiment can be a computing service device with deterministic network time synchronization, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc.; it can also be a deterministic network time synchronization device with the same or similar functions. This embodiment and the following embodiments will be described by taking a deterministic network time synchronization device as an example.

[0052] Based on this, the embodiment of the present application provides a time synchronization method for a deterministic network, referring to Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for time synchronization in a deterministic network according to the present application.

[0053] In this embodiment, the time synchronization method of the deterministic network includes steps S10 to S60, steps S10, S20, and S60 are applied to the terminal side, and steps S30, S40, and S50 are applied to the base station side:

[0054] Step S10: Detect timing related information, and dynamically adjust the real-time status of time and frequency synchronization according to the service layer feedback information and the timing related information to obtain the time status feedback information of the terminal side.

[0055] It should be noted that the time synchronization method of the present application is aimed at a deterministic network scenario of wired-wireless convergence, specifically a 5G access network time synchronization method of a deterministic network. A time synchronization device for a deterministic network is also provided, which can be referred to Figure 2 The time synchronization device includes two parts: a terminal side time synchronization device and a base station side time synchronization information scheduling device.

[0056] It can be understood that the terminal side time synchronization device includes three modules: a time status detection module, a request message sending module and a time synchronization module. Among them, the time status detection module is responsible for maintaining the time status, and the time status feedback information is defined as UETimingStatusReport, which is set to {high, mid, low} according to the precision high, medium and low value range. The method for determining the time status feedback information UETimingStatusReport is that the terminal side obtains timing-related information by detecting hardware performance, measuring downlink reference signals, and analyzing synchronization signals. Then the terminal side dynamically adjusts the real-time status of time and frequency synchronization in combination with the feedback information at the service level (such as scheduling instructions on PD CCH, HARQ feedback, etc.), thereby obtaining the time status feedback information on the terminal side.

[0057] Step S20: encapsulate the time status feedback information into a system message request message, and send the system message request message to the base station side.

[0058] It should be understood that the request message sending module in the terminal side time synchronization device can send the time status feedback information UETimingStatusReport to the base station side based on the system message sending mode requested by the terminal. Specifically, the terminal side can encapsulate the time status feedback information in the system message request message, add a new element UETimingStatusReport in the RRC signaling process, and send the system message request message to the base station side.

[0059] Step S30: when it is detected that the access network time of the deterministic network is updated, the updated access network time is obtained.

[0060] It can be understood that the time synchronization information scheduling device on the base station side can generate 5G time information (including the absolute time information of the 5G master clock and the propagation delay calibration information) and transmit it to the terminal side. The overall process of the time synchronization method of the deterministic network on the base station side can be referred to. Figure 3 The time synchronization information scheduling device at the base station side may include three modules: an access network time update module, an on-demand trigger module, and a time synchronization scheduling module. The access network time update module may detect the access network time of the deterministic network, and when the access network time of the deterministic network is detected to be updated, the updated access network time is obtained.

[0061] Step S40, when the access network time after the update does not reach the periodic trigger time, and the system message request message and / or time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling policy is used as the time synchronization information scheduling policy.

[0062] It is worth noting that in order to meet the high-precision requirements of 5G access network time synchronization while taking into account the scheduling efficiency of resources, an on-demand triggered on-demand triggering scheduling strategy can be designed as a supplement to the periodic triggered scheduling strategy. On-demand triggering specifically refers to: triggering based on the time status feedback information sent by the terminal side and the time source status information maintained by the base station. For non-periodic triggered 5G time information scheduling, in theory, the smaller the scheduling interval, the more timely the terminal can obtain the 5G master clock, for example, ultra-high frequency time information scheduling is performed in each downlink time slot, but this will occupy too many air interface resources. Therefore, this embodiment designs an on-demand triggered on-demand triggering scheduling strategy, which can distribute the time information of the 5G master clock to the terminal in a timely manner to perform time synchronization in the 5G time domain when the time synchronization accuracy decreases or other specific demand scenarios, ensuring the high precision of time synchronization while taking into account the scheduling needs of other services.

[0063] In a specific implementation, the on-demand trigger module in the time synchronization information scheduling device on the base station side determines whether the current information meets the on-demand trigger condition, and first determines whether the access network time after the update reaches the periodic trigger time. If the periodic trigger time is reached, it is determined whether the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition. If the on-demand trigger condition is met, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy.

[0064] Step S50: Distribute the updated access network time to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time.

[0065] It can be understood that the time synchronization scheduling module in the time synchronization information scheduling device on the base station side can distribute the updated access network time to the terminal side through the downlink service channel, so that the terminal side can perform time synchronization according to the updated access network time, thereby achieving efficient resource allocation and adapting to more accurate time synchronization requirements.

[0066] Step S60: receiving the updated access network time fed back by the base station side according to the system message request message, and performing time synchronization according to the updated access network time.

[0067] It is understandable that the time synchronization module in the terminal side time synchronization device can receive the updated access network time fed back by the base station side according to the system message request message, and perform time synchronization according to the updated access network time.

[0068] This embodiment provides a method for time synchronization of a deterministic network. When the base station side detects that the access network time of the deterministic network is updated, it obtains the updated access network time; when the updated access network time does not reach the periodic trigger time, and the system message request message and / or time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy; the updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time. This application can achieve efficient resource allocation by judging whether the on-demand trigger condition is met, and using the on-demand trigger scheduling strategy as the time synchronization information scheduling strategy when the condition is met, while adapting to more accurate time synchronization requirements, thereby solving the problem that the existing system message periodic sending scheme cannot achieve high-precision time synchronization.

[0069] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 4Before step S40, the time synchronization method of the deterministic network further includes steps S31 to S33:

[0070] Step S31: receiving a system message request message sent by a terminal side, and acquiring time status feedback information of the terminal side from the system message request message.

[0071] It can be understood that the base station side can receive the system message request message sent by the terminal side, and the system message request message carries the timing status feedback information UETimingStatusReport detected and encapsulated by the terminal side.

[0072] Step S32: Detect the time source status of the base station side and obtain time source status indication information.

[0073] It can be understood that the time source status indication information TimeSynStatusDegradation on the base station side can be detected, the value range is {0,1}, and the initial value is 0.

[0074] Step S33: determine whether the time source status indication information and / or the time status feedback information meets the on-demand triggering condition.

[0075] It should be understood that whether the on-demand triggering condition is met may be determined in combination with the time status feedback information UETimingStatusReport on the terminal side and the time source status indication information TimeSynStatusDegradation on the base station side.

[0076] In a feasible implementation manner, the value of the time state feedback information includes a highest precision value, an intermediate precision value or a lowest precision value, and the value of the time source state indication information is 0 or 1; the on-demand trigger condition is any one of the first condition, the second condition and the third condition; wherein, the first condition is that the value of the time source state indication information is 0; the second condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is an intermediate precision value; the third condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is a lowest precision value.

[0077] It should be understood that the time status feedback information UETimingStatusReport detected and sent by the terminal side can be obtained, and the value that may be obtained is any one of {highest precision value high, middle precision value mid, lowest precision value low}.

[0078] It should be noted that the time source status information TimeSynStatusDegradation on the base station side can be defined, with a value range of {0,1} and an initial value of 0. If the base station detects that the time source is degraded or degraded, TimeSynStatusDegradation is set to 1, and if the base station detects that the time source is restored, TimeSynStatusDegradation is set to 0.

[0079] Understandably, one can refer to Figure 5 The judgment process of the triggering condition of the time synchronization method of the deterministic network in this embodiment is described. First, determine whether the first condition is met, that is, whether the value of the time source status indication information TimeSynStatusDegradation is 0. If so, it is determined that the on-demand triggering condition is met; otherwise, determine whether the second condition or the third condition meets any one of them, that is, whether the time source status indication TimeSynStatusDegradation value is 1 && the time status feedback UETimingStatusReport value on the terminal side is mid / low. If so, it is determined that the on-demand triggering condition is met.

[0080] In a feasible implementation manner, the on-demand triggered scheduling strategy includes a first distribution strategy, a second distribution strategy and a third distribution strategy, wherein the first distribution strategy is to distribute the updated access network time to the terminal side with a first preset number of times, the second distribution strategy is to distribute the updated access network time to the terminal side with a second preset number of times, and the third distribution strategy is to distribute the updated access network time to the terminal side with a third preset number of times; wherein the preset number of times is the scheduling number of the access network time within the system message scheduling window, the first preset number of times is greater than the second preset number of times, and the second preset number of times is greater than the third preset number of times; step S40, the time synchronization method of the deterministic network also includes steps S401 to S403:

[0081] Step S401: When the access network time after the update does not reach the periodic trigger time and the time source status indication information meets the first condition, the first distribution strategy is used as the time synchronization information scheduling strategy.

[0082] It should be noted that the base station can distribute time information through broadcast system messages, but the optional broadcast period is limited, especially for the extremely low jitter requirements of the industrial Internet, such as isochronous synchronization services, broadcast scheduling alone cannot meet the ultra-high precision time synchronization requirements of such scenarios. Taking into account the ultra-high precision synchronization requirements of the deterministic industrial Internet, while taking into account the scheduling efficiency of resources, this embodiment designs an on-demand trigger scheduling strategy based on the terminal time status feedback information and the time source status information maintained by the base station as a supplement to the periodic triggered broadcast scheduling.

[0083] It is worth noting that when the above-mentioned on-demand triggering conditions are determined to be met, the base station enters the process of triggering the scheduling strategy on demand. A preset number SIWindowSchNum can be defined, which is the number of scheduling times of 5G time information within the system message scheduling window (SI-Window, the length of which is indicated by the SI-WindowLength information element in SIB1). The determination process of SIWindowSchNum can be referred to Figure 6 The preset times include a first preset number SchNum1, a second preset number SchNum2, and a third preset number SchNum3. Among them, SchNum1, SchNum2, and SchNum3 can be determined according to the urgency of the time synchronization requirement. For example, in the 5G integrated TSN scenario, it is determined by the TSN centralized controller and indicated to the 5G core network and 5G base station through the control plane interface. The specific value requirements are SchNum1>SchNum2>SchNum3.

[0084] Specifically, when the updated access network time does not reach the periodic trigger time and the time source status indication information meets the first condition, it means that the on-demand trigger condition is met, and the first distribution strategy is used as the time synchronization information scheduling strategy, that is, the updated access network time is distributed to the terminal side with the first preset number of times SchNum1.

[0085] Step S402, or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the second condition, the second distribution strategy is used as the time synchronization information scheduling strategy.

[0086] Specifically, when the updated access network time does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the second condition, it means that the on-demand trigger condition is met, and the second distribution strategy is used as the time synchronization information scheduling strategy, that is, the updated access network time is distributed to the terminal side with the second preset number of times SchNum2.

[0087] Step S403, or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the third condition, the third distribution strategy is used as the time synchronization information scheduling strategy.

[0088] Specifically, when the updated access network time does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the third condition, it means that the on-demand trigger condition is met, and the third distribution strategy is used as the time synchronization information scheduling strategy, that is, the updated access network time is distributed to the terminal side with the third preset number of times SchNum3.

[0089] In this embodiment, a system message request message sent by the terminal side is received, and the time status feedback information of the terminal side is obtained from the system message request message; the time source status on the base station side is detected to obtain the time source status indication information; it is determined whether the time source status indication information and / or the time status feedback information meets the on-demand triggering condition. When the on-demand triggering condition is met, the on-demand triggering scheduling strategy is used as the time synchronization information scheduling strategy, so that in the scenario where the time synchronization accuracy decreases or other specific requirements are met, the time information of the 5G master clock can be distributed to the terminal in time to perform time synchronization in the 5G time domain, thereby ensuring high accuracy of time synchronization while taking into account the scheduling requirements of other services.

[0090] Based on the first embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the first embodiment can be referred to the above description, and will not be described in detail later. Figure 7 After step S40, the time synchronization method of the deterministic network further includes steps S41 to S42:

[0091] Step S41, when the access network time after the update meets the periodic trigger condition, determine the time synchronization accuracy level, and determine the broadcast period according to the time synchronization accuracy level, wherein the periodic trigger condition is any one of the fourth condition and the fifth condition; the fourth condition is that the access network time after the update reaches the periodic trigger time, and the fifth condition is that the access network time after the update does not reach the periodic trigger time, and the system message request message and time source status indication information sent by the terminal side do not meet the on-demand trigger condition.

[0092] It should be noted that the Industrial Internet has put forward higher requirements for the time synchronization accuracy of the 5G access network. For example, in the 5G integrated TSN system, the synchronization error between the master clock in the TSN time domain and the TSN slave is required to be within 1 microsecond. Therefore, a specific time information scheduling guarantee strategy needs to be designed. The base station distributes the time information of the 5G master clock to the terminal through the periodic broadcast of system messages. In theory, the smaller the broadcast period setting, the more timely the time information scheduling can be made, and the reliability can be improved through a specific scheduling scheme, and higher time synchronization accuracy can be achieved. However, since broadcast scheduling requires fixed occupation of air interface broadcast resources, and the use of ultra-high reliability transmission schemes may occupy too many time and frequency resources, the overall scheduling efficiency and performance are reduced. Based on this, this embodiment proposes to reasonably select the corresponding scheduling guarantee strategy by specifically distinguishing the level of time synchronization accuracy required by the current system.

[0093] It is understandable that first, it can be determined whether the access network time after the update meets the periodic trigger condition. Specifically, it can be determined whether the access network time after the update meets any one of the fourth condition and the fifth condition, that is, if the access network time after the update reaches the periodic trigger time, it is considered that the periodic trigger condition is met; or, if the access network time after the update does not reach the periodic trigger time, and the system message request message and time source status indication information sent by the terminal side do not meet the on-demand trigger condition, it is also considered that the periodic trigger condition is met.

[0094] It is understandable that when the periodic triggering condition is met, the base station enters the process of periodic triggering scheduling strategy. The time synchronization precision level PrecisionClass can be determined, and the value is {1,2,…,7} from high to low. The value is determined by the scenario or business. For example, in the 5G integrated TSN scenario, the TSN centralized controller determines the PrecisionClass and indicates it to the 5G core network and 5G base station through the control plane interface.

[0095] It should be understood that the broadcast period SI-Periodicity can be calculated according to the time synchronization accuracy level PrecisionClass, and the calculation formula is as follows:

[0096] SI-Periodicity=8×2 PrecisionClass-1 ,

[0097] The definition of SI-Periodicity may refer to the 3GPP standard, the unit is one radio frame, and the value range is {8, 16, 32, 64, 128, 256, 512}.

[0098] Step S42: Using the periodic trigger scheduling strategy as the time synchronization information scheduling strategy, the periodic trigger scheduling strategy is to distribute the updated access network time to the terminal side according to the broadcast period.

[0099] In a feasible implementation, step S50 may include steps S501 to S504:

[0100] Step S501: Acquire a preset modulation and coding strategy pre-estimated through a downlink channel.

[0101] It should be noted that after the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy or the periodic trigger scheduling strategy is used as the time synchronization information scheduling strategy, the following process of determining the modulation and coding scheme (MCS) and the number of resource blocks (RB) of the time information can be performed. The preset modulation and coding strategy MCS_SINR that is pre-measured and estimated by the base station side through the downlink channel can be obtained, and the value range is {0,1,…,28}.

[0102] Step S502: determining a final modulation and coding strategy according to a preset modulation and coding strategy, a time synchronization accuracy level and network management configurable parameters.

[0103] It is understandable that MCS_SI can be defined as the final output scheduling MCS strategy, with a value range of {0,1,…,28}. In order to meet the time synchronization requirements of the 5G access network in the deterministic network and ensure the transmission of time information, the scheduling MCS strategy should consider the accuracy requirements of time synchronization. The calculation method of MCS_SI is shown in the following formula:

[0104] MCS_SI=MCS_SINR-(Inve-PrecisionClass),

[0105] Among them, MCS_SINR is obtained through downlink channel measurement and estimation, SINR represents channel quality, and the method of mapping MCS adopts Low SE 64QAM MCS to improve transmission reliability. Inve is a parameter configurable by the network management, and the value range of Inve is {7, 8, …, 29}.

[0106] Step S503: determining the number of resource blocks to be scheduled according to the final modulation and coding strategy and the transport block size requirement of the time information.

[0107] It should be understood that the number of scheduled resource blocks RB may be determined according to the final modulation and coding strategy MCS_SI and the transport block size TBSIZE requirement of the time information.

[0108] Step S504: Distribute the updated access network time to the terminal side according to the time synchronization information scheduling strategy and the number of scheduled resource blocks.

[0109] In this embodiment, when the updated access network time meets the periodic trigger condition, the time synchronization accuracy level is determined, and the broadcast period is determined according to the time synchronization accuracy level. The periodic trigger scheduling strategy is used as the time synchronization information scheduling strategy. The periodic trigger scheduling strategy distributes the updated access network time to the terminal side according to the broadcast period, thereby being able to reasonably select the corresponding scheduling guarantee strategy by specifically distinguishing the level of time synchronization accuracy required by the current system.

[0110] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the time synchronization method of the deterministic network of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0111] The present application provides a time synchronization device for a deterministic network, the time synchronization device for a deterministic network comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the time synchronization method for the deterministic network in the above-mentioned embodiment 1.

[0112] Reference below Figure 8 , which shows a schematic diagram of the structure of a time synchronization device suitable for implementing a deterministic network in an embodiment of the present application. The time synchronization device of the deterministic network in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 8 The time synchronization device of the deterministic network shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0113] like Figure 8As shown, the time synchronization device of the deterministic network may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (R AM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the time synchronization device of the deterministic network are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 may allow the time synchronization device of the deterministic network to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a time synchronization device of a deterministic network with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have instead.

[0114] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0115] The time synchronization device for a deterministic network provided by the present application adopts the time synchronization method for a deterministic network in the above-mentioned embodiment, and can solve the technical problem of time synchronization for a deterministic network. Compared with the prior art, the beneficial effects of the time synchronization device for a deterministic network provided by the present application are the same as the beneficial effects of the time synchronization method for a deterministic network provided by the above-mentioned embodiment, and other technical features in the time synchronization device for a deterministic network are the same as the features disclosed in the method of the previous embodiment, and are not described in detail here.

[0116] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0117] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0118] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the time synchronization method for a deterministic network in the above-mentioned embodiment.

[0119] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0120] The computer-readable storage medium may be included in a time synchronization device of a deterministic network; or may exist independently without being assembled into a time synchronization device of a deterministic network.

[0121] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by a time synchronization device of a deterministic network, the time synchronization device of the deterministic network: detects timing-related information, and dynamically adjusts the real-time status of time and frequency synchronization according to the service layer feedback information and the timing-related information, and obtains the time status feedback information of the terminal side; encapsulates the time status feedback information into a system message request message, and sends the system message request message to the base station side; when the access network time of the deterministic network is updated, the updated access network time is obtained; when the updated access network time does not reach the periodic trigger time, and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand triggering condition, the on-demand trigger scheduling strategy is used as the time synchronization information scheduling strategy; according to the time synchronization information scheduling strategy, the updated access network time is distributed to the terminal side, so that the terminal side performs time synchronization according to the updated access network time; receives the updated access network time fed back by the base station side according to the system message request message, and performs time synchronization according to the updated access network time.

[0122] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0123] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0124] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0125] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned deterministic network time synchronization method, and can solve technical problems. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the deterministic network time synchronization method provided in the above-mentioned embodiment, and will not be repeated here.

[0126] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned deterministic network time synchronization method when executed by a processor.

[0127] The computer program product provided by the present application can solve the technical problem. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the time synchronization method for a deterministic network provided by the above embodiment, which will not be described in detail here.

[0128] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A time synchronization method for a deterministic network, the method being applied to a base station side, characterized in that: The method includes: When it is detected that the access network time of the deterministic network is updated, the updated access network time is obtained; When the access network time after the update does not reach the periodic trigger time, and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, the on-demand trigger scheduling policy is used as the time synchronization information scheduling policy; The updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy, so that the terminal side performs time synchronization according to the updated access network time.

2. The method according to claim 1, characterized in that Before the step of using the on-demand trigger scheduling strategy as the time synchronization information scheduling strategy when the access network time after the update does not reach the periodic trigger time and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, the step also includes: Receiving a system message request message sent by the terminal side, and obtaining time status feedback information of the terminal side from the system message request message; Detect the time source status on the base station side and obtain time source status indication information; Determine whether the time source status indication information and / or the time status feedback information meets an on-demand triggering condition.

3. The method according to claim 2, characterized in that The value of the time state feedback information includes the highest precision value, the intermediate precision value or the lowest precision value, and the value of the time source state indication information is 0 or 1; the on-demand trigger condition is any one of the first condition, the second condition and the third condition; wherein, the first condition is that the value of the time source state indication information is 0; the second condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is the intermediate precision value; the third condition is that the value of the time source state indication information is 1, and the value of the time state feedback information is the lowest precision value.

4. The method according to claim 3, characterized in that The on-demand triggered scheduling strategy includes a first distribution strategy, a second distribution strategy and a third distribution strategy, wherein the first distribution strategy is to distribute the updated access network time to the terminal side at a first preset number of times, the second distribution strategy is to distribute the updated access network time to the terminal side at a second preset number of times, and the third distribution strategy is to distribute the updated access network time to the terminal side at a third preset number of times; wherein the preset number of times is the scheduling number of the access network time within the system message scheduling window, the first preset number of times is greater than the second preset number of times, and the second preset number of times is greater than the third preset number of times; The step of using the on-demand trigger scheduling strategy as the time synchronization information scheduling strategy when the access network time after the update does not reach the periodic trigger time and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition includes: When the access network time after the update does not reach the periodic trigger time and the time source status indication information meets the first condition, using the first distribution strategy as the time synchronization information scheduling strategy; or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the second condition, using the second distribution strategy as the time synchronization information scheduling strategy; Or, when the access network time after the update does not reach the periodic trigger time, and the time source status indication information and the time status feedback information meet the third condition, the third distribution strategy is used as the time synchronization information scheduling strategy.

5. The method according to claim 1, characterized in that After the step of using the on-demand trigger scheduling strategy as the time synchronization information scheduling strategy when the access network time after the update does not reach the periodic trigger time and the system message request message and / or the time source status indication information sent by the terminal side meets the on-demand trigger condition, the method further includes: When the access network time after the update meets the periodic trigger condition, determine the time synchronization accuracy level, and determine the broadcast period according to the time synchronization accuracy level, wherein the periodic trigger condition is any one of the fourth condition and the fifth condition; the fourth condition is that the access network time after the update reaches the periodic trigger time, and the fifth condition is that the access network time after the update does not reach the periodic trigger time, and the system message request message and the time source status indication information sent by the terminal side do not meet the on-demand trigger condition; A periodic trigger scheduling strategy is used as a time synchronization information scheduling strategy, and the periodic trigger scheduling strategy is to distribute the updated access network time to the terminal side according to the broadcast period.

6. The method according to any one of claims 1 to 5, characterized in that The step of distributing the updated access network time to the terminal side according to the time synchronization information scheduling strategy includes: Acquire a preset modulation and coding strategy pre-estimated through a downlink channel; Determine the final modulation and coding strategy based on the preset modulation and coding strategy, time synchronization accuracy level and network management configurable parameters; Determining the number of resource blocks to be scheduled according to the final modulation and coding strategy and the transport block size requirement of the time information; The updated access network time is distributed to the terminal side according to the time synchronization information scheduling strategy and the number of scheduled resource blocks.

7. A time synchronization method for a deterministic network, the method being applied to a terminal side, characterized in that: The method includes: Detect timing related information, and dynamically adjust the real-time status of time and frequency synchronization according to the service layer feedback information and the timing related information, and obtain time status feedback information on the terminal side; Encapsulating the time state feedback information into a system message request message, and sending the system message request message to the base station side; Receive the updated access network time fed back by the base station side according to the system message request message, and perform time synchronization according to the updated access network time.

8. A time synchronization device for a deterministic network, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for time synchronization of a deterministic network as claimed in any one of claims 1 to 6 or claim 7.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the time synchronization method for a deterministic network as claimed in any one of claims 1 to 6 or claim 7 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the method for time synchronization of a deterministic network as claimed in any one of claims 1 to 6 or claim 7 are implemented.

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