CN116113033B - Method and system for synchronizing NR system and LTE system - Google Patents
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Abstract
The invention provides a method and a system for synchronizing an NR system and an LTE system, which relate to the technical field of wireless communication and comprise the following steps: respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock; periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under a synchronous timing clock of the NR system at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock of the LTE system; and processing to obtain a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system. The synchronous method has the advantages that the synchronous mode is simple and the precision requirement can be met.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and a system for synchronizing an NR system with an LTE system.
Background
In a wireless communication system supporting an NR system (New Radio, new Radio system) and an LTE system (Long Term Evolution, long term evolution system), a number of inter-rate (inter-rate) measurement objects with high accuracy requirements, such as SFTD (SFN and frame timing difference, see 38.215 for detailed definition), are involved, and the accuracy requirement Ts (1/30.72 MHz). When these measurements are completed, synchronization is performed on the system frame numbers (system frame number, abbreviated SFN) and subframe numbers (subframe, abbreviated SF) of NR and LTE.
The existing synchronization method generally adopts a hardware snapshot mode to synchronously read clocks of an NR system and an LTE system, periodically starts hardware, increases power consumption, and is too complex.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for synchronizing an NR system and an LTE system, which comprises the following steps: step S1, respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock; step S2, periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under the synchronous timing clock at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock; and step S3, processing to obtain a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system.
Preferably, in the step S1, the synchronous timing clock is obtained by processing the first timing clock and the second timing clock, and a larger value of the first timing clock and the second timing clock is used as the synchronous timing clock.
Preferably, the step S3 includes: step S31, determining whether the first count value is equal to the second count value: if yes, taking the difference between the first system frame number and the second system frame number as the frame number difference, taking the difference between the first system subframe number and the second system subframe number as the subframe number difference, configuring the subframe boundary difference as 0, and returning to the step S2; if not, turning to step S32; and step S32, taking the difference value between the first system frame number and the second system frame number as the frame number difference value, processing the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number and the subframe count value of each subframe length which is obtained in advance under the synchronous timing clock to obtain the subframe number difference value and the subframe boundary difference value, and returning to the step S2.
Preferably, in the step S32, the subframe boundary difference value is calculated according to the following formula:
wherein,,for representing the sub-frame boundary difference,/for each sub-frame>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
Preferably, in the step S32, the subframe number difference is calculated according to the following formula:
wherein,,for representing the sub-frame number difference,/or->For representing the first system frame number,for representing the first system subframe number, and (2)>For representing said second system frame number, < > and->For representing the second system subframe number, and (2)>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
The invention also provides a system for synchronizing the NR system and the LTE system, and the system comprises: the clock acquisition module is used for respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock; the clock counting module is connected with the clock acquisition module and is used for periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under the synchronous timing clock at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock; and the system synchronization module is connected with the clock counting module and is used for processing and obtaining a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system.
Preferably, in the clock acquisition module, the synchronous timing clock is obtained by processing the first timing clock and the second timing clock, and a larger value in the first timing clock and the second timing clock is used as the synchronous timing clock.
Preferably, the system synchronization module includes: a count judgment unit configured to, when judging that the first count value is equal to the second count value, take a difference between the first system frame number and the second system frame number as the frame number difference, take a difference between the first system subframe number and the second system subframe number as the subframe number difference, and configure the subframe boundary difference to 0, and output a synchronization signal when judging that the first count value is not equal to the second count value; and the synchronous control unit is connected with the counting judgment unit and is used for taking the difference value between the first system frame number and the second system frame number as the frame number difference value according to the synchronous signal, and processing the subframe number difference value and the subframe boundary difference value according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number and the subframe count value of each subframe length which is obtained in advance under the synchronous timing clock.
Preferably, the subframe boundary difference value is calculated according to the following formula:
wherein,,for representing the sub-frame boundary difference,/for each sub-frame>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
Preferably, the subframe number difference is calculated according to the following formula:
wherein,,for representing the sub-frame number difference,/or->For representing the first system frame number,for representing the first system subframe number, and (2)>For representing said second system frame number, < > and->For representing the second system subframe number, and (2)>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
The technical scheme has the following advantages or beneficial effects: the snapshot hardware device is not required to be additionally configured, the power consumption is saved, the synchronization mode is simple, and the precision requirement can be met.
Drawings
Fig. 1 is a flow chart of a method for synchronizing an NR system with an LTE system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic flow chart of step S3 in the preferred embodiment of the present invention;
fig. 3 is a schematic diagram of a system for synchronizing an NR system with an LTE system according to a preferred embodiment of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present invention is not limited to the embodiment, and other embodiments may fall within the scope of the present invention as long as they conform to the gist of the present invention.
In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a method for synchronizing an NR system with an LTE system is now provided, as shown in fig. 1, including: step S1, respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock; step S2, periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under a synchronous timing clock of the NR system at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock of the LTE system; and step S3, processing to obtain a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system.
Specifically, assume that the LTE system needs to employ a frequency ofThe NR system uses the first clock with clock frequency of +.>As a timing counter. In this embodiment, the synchronous timing clock is obtained by processing the first timing clock and the second timing clock, and the larger value of the first timing clock and the second timing clock is used as the synchronous timing clock. In other words, the present invention employs a frequency of +.>Is used as a timing counter, wherein +.>Realizing that under the same synchronous timing clockAnd respectively maintaining a first system frame number and a first system subframe number of the NR system, and a second system frame number and a second system subframe number of the LTE system.
Further specifically, since the first count value of the NR system and the second count value of the LTE system are based on the same synchronization timing clock, no additional snapshot hardware device is needed for synchronization of the system frame number and the system subframe number between the NR system and the LTE system, and only the first system frame number, the first system subframe number, the first count value, and the second system frame number of the current NR system, the second system subframe number, and the second count value are obtained by software, so that a frame number difference value, a subframe number difference value, and a subframe boundary difference value between the NR system and the LTE system can be calculated, and synchronization of the NR system and the LTE system is further realized.
In a preferred embodiment of the present invention, as shown in fig. 2, step S3 includes: step S31, determining whether the first count value is equal to the second count value: if yes, taking the difference between the first system frame number and the second system frame number as a frame number difference, taking the difference between the first system subframe number and the second system subframe number as a subframe number difference, configuring the subframe boundary difference as 0, and returning to the step S2; if not, turning to step S32; step S32, the difference between the first system frame number and the second system frame number is used as a frame number difference, and the subframe number difference and the subframe boundary difference are obtained by processing according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number and the subframe count value of each subframe length under the synchronous timing clock, which are acquired in advance, and then the step S2 is returned.
Specifically, in the present embodiment, when the first count value is equal to the second count value, it is explained that the boundaries of the first system subframe number of the NR system and the second system subframe number of the LTE system are aligned, that is, the subframe boundary difference value is 0. Although the subframe boundaries between the NR system and the LTE system are aligned, there may be a difference in subframe numbers before the two, such as the boundary alignment of the 8 th subframe and the 9 th subframe, but the subframe difference is 1. Preferably, the above-mentioned subframe differences are opposite, and different symbols of the subframe differences are associated with the NR system and the LTE system. Taking the 8 th subframe as the first subframe number of the NR system and the 9 th subframe as the second subframe number of the LTE system as an example, the subframe difference value between the two is 1, but for the NR system, the subframe difference value is 1, namely the NR system obtains the 8 th subframe as the first subframe number of the NR system, and the corresponding subframe difference value is 1, the 9 th subframe as the subframe number of the LTE system can be directly calculated, so that the subframe synchronization with the LTE system is realized. For the LTE system, the subframe difference value is-1, namely the LTE system obtains the 9 th subframe of the subframe number of the second system, and when the corresponding subframe difference value is-1, the 8 th subframe of the subframe number of the NR system can be directly calculated, so that the subframe synchronization with the NR system is realized.
The frame number differences between the NR system and the LTE system are also opposite, and for symbols of different frame number differences associated with the NR system and the LTE system, specific processing modes are the same as the subframe differences, and are not repeated here.
In a preferred embodiment of the present invention, in step S32, the subframe boundary difference is calculated according to the following formula:
wherein,,for representing sub-frame boundary differences,/>For the purpose of representing a first count value,for representing a second count value->For representing the sub-frame count value.
Specifically, in this embodiment, the above-mentioned subframe count value is a clock count value of each subframe length under the synchronous timing clock, and the above-mentioned subframe length is typically 1ms.
In a preferred embodiment of the present invention, in step S32, the subframe number difference is calculated according to the following formula:
wherein,,for representing the difference of sub-frame numbers,/or->For representing the first system frame number +.>For representing the first system subframe number,/or->For representing the second system frame number, +.>For representing the number of the second system sub-frame,for representing a first count value->For representing a second count value->For representing the sub-frame count value.
The invention also provides a system for synchronizing the NR system and the LTE system, which applies the method, as shown in figure 3, and comprises the following steps: the clock acquisition module 1 is used for respectively acquiring a first timing clock of the NR system and a second timing clock of the LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock; the clock counting module 2 is connected with the clock acquisition module 1 and is used for periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under the synchronous timing clock of the NR system at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock of the LTE system; the system synchronization module 3 is connected with the clock counting module 2 and is used for processing and obtaining a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system.
In the preferred embodiment of the present invention, in the clock acquisition module 1, the synchronous timing clock is obtained according to the processing of the first timing clock and the second timing clock, and the larger value of the first timing clock and the second timing clock is used as the synchronous timing clock.
In a preferred embodiment of the present invention, the system synchronization module 3 includes: a count judgment unit 31 for taking a difference between the first system frame number and the second system frame number as a frame number difference, taking a difference between the first system subframe number and the second system subframe number as a subframe number difference, and configuring a subframe boundary difference as 0 when judging that the first count value is equal to the second count value, and outputting a synchronization signal when judging that the first count value is not equal to the second count value; the synchronization control unit 32 is connected to the count judging unit 31, and is configured to treat a difference between the first system frame number and the second system frame number as a frame number difference according to the synchronization signal, and process the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number, and the subframe count value of each subframe length obtained in advance under the synchronization timing clock to obtain a subframe number difference and a subframe boundary difference.
In a preferred embodiment of the present invention, the subframe boundary difference is calculated according to the following formula:
wherein,,for representing sub-frame boundary differences,/>For the purpose of representing a first count value,for representing a second count value->For representing the sub-frame count value.
In a preferred embodiment of the present invention, the subframe number difference is calculated according to the following formula:
wherein,,for representing the difference of sub-frame numbers,/or->For representing the first system frame number +.>For representing the first system subframe number,/or->For representing the second system frame number, +.>For representing the number of the second system sub-frame,for representing a first count value->For representing a second count value->For representing the sub-frame count value.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and drawings, and are intended to be included within the scope of the present invention.
Claims (6)
1. A method for synchronizing an NR system with an LTE system, comprising:
step S1, respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock;
processing according to the first timing clock and the second timing clock to obtain the synchronous timing clock, wherein the larger value in the first timing clock and the second timing clock is used as the synchronous timing clock;
step S2, periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under the synchronous timing clock at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock;
step S3, processing to obtain a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system;
the step S3 includes:
step S31, determining whether the first count value is equal to the second count value:
if yes, taking the difference between the first system frame number and the second system frame number as the frame number difference, taking the difference between the first system subframe number and the second system subframe number as the subframe number difference, configuring the subframe boundary difference as 0, and returning to the step S2;
if not, turning to step S32;
and step S32, taking the difference value between the first system frame number and the second system frame number as the frame number difference value, processing the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number and the subframe count value of each subframe length which is obtained in advance under the synchronous timing clock to obtain the subframe number difference value and the subframe boundary difference value, and returning to the step S2.
2. The method according to claim 1, wherein in the step S32, the subframe boundary difference is calculated according to the following formula:
3. The method according to claim 1, wherein in the step S32, the subframe number difference is calculated according to the following formula:
wherein,,wherein (1)>For representing the difference in the number of the sub-frames,for representing said first system frame number, < > and->For representing the first system subframe number, and (2)>For representing said second system frame number, < > and->For representing the second system subframe number, and (2)>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
4. A system for synchronizing an NR system with an LTE system, wherein a method according to any one of claims 1-3 is applied, the system comprising:
the clock acquisition module is used for respectively acquiring a first timing clock of an NR system and a second timing clock of an LTE system, and processing according to the first timing clock and the second timing clock to obtain a synchronous timing clock;
processing according to the first timing clock and the second timing clock to obtain the synchronous timing clock, wherein the larger value in the first timing clock and the second timing clock is used as the synchronous timing clock;
the clock counting module is connected with the clock acquisition module and is used for periodically acquiring a first system frame number, a first system subframe number and a first count value corresponding to the NR system under the synchronous timing clock at the same moment, and acquiring a second system frame number, a second system subframe number and a second count value corresponding to the LTE system under the synchronous timing clock;
the system synchronization module is connected with the clock counting module and is used for processing and obtaining a frame number difference value, a subframe number difference value and a subframe boundary difference value between the NR system and the LTE system according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number and the second system subframe number so as to synchronize the NR system and the LTE system;
the system synchronization module includes:
a count judgment unit configured to, when judging that the first count value is equal to the second count value, take a difference between the first system frame number and the second system frame number as the frame number difference, take a difference between the first system subframe number and the second system subframe number as the subframe number difference, and configure the subframe boundary difference to 0, and output a synchronization signal when judging that the first count value is not equal to the second count value;
and the synchronous control unit is connected with the counting judgment unit and is used for taking the difference value between the first system frame number and the second system frame number as the frame number difference value according to the synchronous signal, and processing the subframe number difference value and the subframe boundary difference value according to the first count value, the second count value, the first system frame number, the first system subframe number, the second system frame number, the second system subframe number and the subframe count value of each subframe length which is obtained in advance under the synchronous timing clock.
5. The system of claim 4, wherein the subframe boundary difference is calculated according to the following formula:
6. The system of claim 4, wherein the subframe number difference is calculated according to the following formula:
wherein,,wherein (1)>For representing the difference in the number of the sub-frames,for representing said first system frame number, < > and->For representing the first system subframe number, and (2)>For representing said second system frame number, < > and->For representing the second system subframe number, and (2)>For representing said first count value,/or->For representing said second count value,/or->For representing the sub-frame count value.
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