CN114126033B - Air interface synchronization method and system for indoor division base station - Google Patents
Air interface synchronization method and system for indoor division base station Download PDFInfo
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Abstract
The invention provides a room division base station air interface synchronization method and a system, wherein the method comprises the following steps: acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference, and intercepting wireless frame data; acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio; acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage; determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio and the signal-to-noise ratio threshold in the synchronization maintaining stage; and if the real-time synchronization state is judged to be out of synchronization and synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation. The invention effectively improves the stability of the air interface synchronous state of the indoor base station under the complex environment on the premise of not increasing the hardware cost of the base station and having low realization complexity, and expands the application scene range of the indoor base station.
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 air interfaces of a indoor unit base station.
Background
With the rapid development of mobile communication, mobile terminals and increasingly improved network conditions, mobile services gradually transition from early pure voice services and text services to multimedia services with richer applications, and application scenes are also expanded from wide-range outdoor scenes to indoor coverage hot spot scenes.
The mobile communication system has high requirements on synchronization technology, wherein uplink and downlink time slot alignment, high-quality and reliable data transmission and cell-to-cell switching all need to be realized by means of accurate synchronization technology. In particular, in a time division duplex communication system, it is required that all cells must be strictly synchronized, including slot synchronization, system frame synchronization, and subframe synchronization, in order to avoid mutual interference between base stations and terminals. Global Positioning System (GPS), IEEE1588v2, air interface synchronization are currently the mainstream inter-base station synchronization method. The mobile communication system uses GPS to synchronize, which can obtain higher synchronization precision, but GPS indoor signal is bad and failure rate is higher. The IEEE1588v2 synchronization technology is to set a clock server on a certain node in a transmission network, take the clock server as a synchronization source, inject synchronization timing information into the transmission network, and transmit the synchronization timing information to a base station as a base station synchronization reference, but the synchronization technology needs to receive and send the same report Wen Shiyan of transmission, and has strict application conditions and high cost. The air interface synchronization is to align time by detecting the synchronization signal of the adjacent base station and correct the frequency deviation by detecting the reference signal, thereby realizing the mutual synchronization of the base stations in the networking. In the indoor coverage scene of a miniaturized or miniaturized base station, the condition of using GPS synchronization and IEEE1588v2 synchronization is not generally provided when equipment is installed, so that the adoption of air interface synchronization is a scheme for effectively solving the synchronization problem in the scene.
The air interface synchronization process is specifically divided into initial synchronization and synchronization maintenance. The synchronization maintenance is to continue to periodically detect the synchronization signal or the reference signal sent by the synchronization source base station on the basis that the initial synchronization acquires the synchronization information of the synchronization source base station so as to maintain the synchronization state between the base stations. The synchronization signals are divided into PSS (Primary Synchronization Signal ) and (Secondary Synchronization Signal, secondary synchronization signal), and the reference signal is generally referred to as CRS (Cell Reference Signal ). The 3GPP proposes two indoor air interface synchronization techniques, one is to transmit a clock synchronization signal based on a special subframe Guard (GP) interval, and the other is to detect a reference signal of a synchronization source cell based on a silence subframe to acquire time synchronization. In general, a mobile operator may adjust macro base station parameters according to a wireless network environment change condition for optimizing an access network, or configure some idle periods to reduce downlink transmission power of a macro base station based on energy saving factors, or generate strong interference signals in a certain frequency band due to indoor environment change, at this time, the quality of downlink signals received by a small-sized or miniature indoor base station is directly affected, so that synchronization and downlink of an air interface of the indoor base station are caused. Particularly in a time division duplex system, long-time downlink out-of-step caused by the loss of a synchronization source can cause the accumulated offset between the frame header of the indoor division base station and the frame header of the macro base station to be larger and larger, and when the frame header offset exceeds a certain range, the downlink signal of the macro base station can be partially overlapped with the uplink time slot of the indoor division base station in time, so that the access of the mobile terminal is seriously affected.
Therefore, providing a method for improving the stability of the air interface synchronization state in the low signal-to-noise environment without increasing the hardware cost of the base station and with low implementation complexity is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides an air interface synchronization method and system for a room division base station, which are used for solving the defect that a small or miniature base station is difficult to self-recover after air interface synchronization is out of step due to the deterioration of downlink signal to noise ratio of a synchronization frequency point when an air interface synchronization mode is adopted in a room division scene in the prior art.
In a first aspect, the present invention provides a method for synchronizing air interfaces of a cell division base station, including:
acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data;
acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio;
acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value;
determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold;
and if the real-time synchronous state is judged to be out of step and the synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation.
According to the air interface synchronization method of the indoor division base station provided by the invention, synchronization information sent by a synchronization source base station is obtained, a downlink timing reference is determined based on the synchronization information, and wireless frame data is intercepted, and the method comprises the following steps:
determining an air interface time sequence of an air interface data stream and the position of a synchronizing signal in a wireless frame based on the synchronizing information, calculating to obtain a frame head initial position of a synchronizing source base station, and taking the frame head initial position of the synchronizing source base station as the downlink timing reference;
and based on the downlink timing reference, intercepting a plurality of wireless frame data from the air interface data stream.
According to the air interface synchronization method of the indoor division base station provided by the invention, the signal to noise ratio of an initial synchronization stage is obtained based on the wireless frame data, and a signal to noise ratio threshold is obtained according to the signal to noise ratio of the initial synchronization stage, and the method comprises the following steps:
performing time-frequency conversion on the wireless frame data to obtain a corresponding downlink reference signal;
calculating Resource Block (RB) data occupied by the downlink reference signal based on Discrete Fourier Transform (DFT) channel estimation to obtain noise energy (RIP);
and obtaining a plurality of initial SNR statistic by the RIP, accumulating the plurality of initial SNR statistic, and then obtaining an average value to obtain the SNR threshold.
According to the air interface synchronization method of the indoor division base station provided by the invention, a timing reference adjustment strategy is determined based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold, and the method comprises the following steps:
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, inverting the frame head relative offset value to obtain a first non-zero adjustment value, taking the first non-zero adjustment value as an adjustment step length to adjust the current timing reference position, and storing the first non-zero adjustment value into a cyclic array with a preset length;
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is smaller than the signal-to-noise ratio threshold, accumulating the frame header relative offset value to obtain an accumulated value, when the accumulated value reaches an adjustment threshold, inverting the accumulated value to obtain a second non-zero adjustment value, taking the second non-zero adjustment value as an adjustment step length to adjust the current timing reference position, storing the second non-zero adjustment value into a cyclic array with a preset length, and resetting the accumulated value;
if the real-time synchronization state is out-of-step and the signal-to-noise ratio in the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, accumulating the frame head relative offset value, and not adjusting the current timing reference position;
and if the real-time synchronization state is out-of-synchronization and the signal to noise ratio in the synchronization maintaining stage is smaller than the signal to noise ratio threshold, the processing is not performed.
According to the air interface synchronization method of the indoor base station provided by the invention, if the real-time synchronization state is judged to be out of step and synchronization is not recovered within the preset detection period times, self-adaptive pre-compensation is performed, and the method comprises the following steps:
accumulating a plurality of adjustment values in the cyclic array to obtain a first accumulated value, taking the number of the plurality of adjustment values as a first precompensation period, adjusting a current timing reference position based on the first accumulated value and the first precompensation period, and determining a current synchronous state after the first precompensation period is finished;
if the first accumulated value is 0, removing the last adjusting value in the plurality of adjusting values, accumulating the remaining adjusting values to obtain a second accumulated value, subtracting 1 from the number of the plurality of adjusting values to obtain a second precompensation period, adjusting the current timing reference position based on the second accumulated value and the second precompensation period, and determining the current synchronous state after the second precompensation period is finished;
and similarly, if the real-time synchronous state is out-of-step in the current pre-compensation period, entering the next pre-compensation period to continue pre-compensation.
The air interface synchronization method of the indoor division base station provided by the invention further comprises the following steps:
and if the real-time synchronous states are synchronous in a continuous preset number detection period after the current precompensation period is finished, closing the self-adaptive precompensation and recovering a timing reference adjustment mechanism.
In a second aspect, the present invention further provides an air interface synchronization system of a indoor division base station, including:
the first processing module is used for acquiring the synchronization information sent by the synchronization source base station, determining a downlink timing reference based on the synchronization information and intercepting wireless frame data;
the second processing module is used for acquiring the signal-to-noise ratio of the initial synchronization stage based on the wireless frame data and acquiring a signal-to-noise ratio threshold according to the signal-to-noise ratio of the initial synchronization stage;
the third processing module is used for acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value;
the adjusting module is used for determining a timing reference adjusting strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold;
and the pre-compensation module is used for carrying out self-adaptive pre-compensation if the real-time synchronous state is judged to be out-of-step and the synchronization is not recovered within the preset detection period times.
In a third aspect, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of any one of the above-mentioned air interface synchronization methods of the indoor base station when the processor executes the program.
In a fourth aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a method for air interface synchronization of a cell division base station as described in any of the above.
In a fifth aspect, the present invention also provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of a method for air interface synchronization of a cell division base station as described in any one of the above.
According to the air interface synchronization method and system of the indoor base station, the downlink signal of the synchronization source base station is periodically detected, the detection result is periodically counted, the frame head offset is estimated, the self-adaptive pre-compensation adjustment is carried out on the timing reference of the indoor base station after the synchronization state is lost in the low signal-to-noise ratio environment, so that the air interface synchronization state is maintained, auxiliary synchronization equipment such as a GPS (global positioning system) is not needed, and the radio frequency channel is not needed to be frequently switched by frequently replacing the synchronization frequency point, on the premise that the hardware cost of the base station is not increased and the implementation complexity is low, the stability of the air interface synchronization state of the indoor base station in the complex environment is effectively improved, and the application scene range of the indoor base station is enlarged.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an air interface synchronization method of a indoor base station provided by the invention;
FIG. 2 is a flow chart of a timing reference adjustment strategy provided by the present invention;
FIG. 3 is a schematic flow chart of adaptive precompensation provided by the present invention;
fig. 4 is a schematic structural diagram of an air interface synchronization system of a indoor base station provided by the invention;
fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Aiming at the problems existing in the prior art, the invention provides an air interface synchronization maintaining method aiming at a room-separated miniature or miniature base station in a low signal-to-noise ratio environment, so as to solve the problem that the original air interface synchronization scheme is difficult to restore after the synchronization state is lost in the low signal-to-noise ratio environment.
Fig. 1 is a flow chart of an air interface synchronization method of a indoor base station provided by the invention, as shown in fig. 1, including:
step S1, acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data;
in the initial synchronization stage, after the synchronization information of the synchronization source base station is acquired, the indoor division base station sets a downlink timing reference through an internal clock control unit, and meanwhile, wireless frame data is intercepted.
Step S2, acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio;
and acquiring the signal-to-noise ratio of the initial synchronization stage from the intercepted wireless frame data through a channel estimation unit, accumulating the calculation results, and then averaging to obtain a signal-to-noise ratio threshold.
Step S3, a downlink air interface signal is obtained according to a preset period, a real-time synchronization state and a frame head relative offset value of a synchronization source base station are obtained by the downlink air interface signal, and a signal to noise ratio in a synchronization maintaining stage is obtained based on the frame head relative offset value;
after entering the synchronization maintaining stage, the indoor division base station periodically detects downlink air interface signals through an air interface interception unit, acquires a real-time synchronization state and a relative offset value between the indoor division base station and a frame head of a synchronization source base station, and simultaneously acquires a signal to noise ratio of the synchronization maintaining stage through a channel estimation unit.
Step S4, determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold;
and the indoor division base station selects a timing reference adjustment strategy according to the real-time synchronization state and the comparison result of the real-time signal-to-noise ratio and the signal-to-noise ratio threshold.
And S5, if the real-time synchronization state is judged to be out of synchronization and synchronization is not recovered within the preset detection period, performing self-adaptive pre-compensation.
If the real-time synchronization state is out of step and synchronization is not recovered for a plurality of detection periods, the indoor division base station performs self-adaptive pre-compensation on the timing reference offset.
According to the invention, the downlink signal of the synchronous source base station is periodically detected, the detection result is periodically counted, the frame head offset is estimated, and the self-adaptive pre-compensation adjustment is carried out on the timing reference of the indoor base station after the synchronization state is lost under the low signal-to-noise ratio environment, so that the air interface synchronization state is maintained, the auxiliary synchronization equipment such as a GPS (global positioning system) is not needed, and the frequency channel is not needed to be frequently switched by frequently replacing the synchronization frequency point, so that the stability of the air interface synchronization state of the indoor base station under the complex environment is effectively improved on the premise of not increasing the hardware cost of the base station and realizing low complexity, and the application scene range of the indoor base station is enlarged.
Based on the above embodiment, step S1 includes:
determining an air interface time sequence of an air interface data stream and the position of a synchronizing signal in a wireless frame based on the synchronizing information, calculating to obtain a frame head initial position of a synchronizing source base station, and taking the frame head initial position of the synchronizing source base station as the downlink timing reference;
and based on the downlink timing reference, intercepting a plurality of wireless frame data from the air interface data stream.
Specifically, the invention provides a downlink timing reference MFC in an initial synchronization stage init And calculating the initial position of the frame head of the synchronous source base station according to the 3GPP protocol by a clock control unit in the indoor base station according to the initial synchronous information of the synchronous source base station, namely the air interface time sequence and the position of the synchronous signal in the wireless frame, and setting the initial position as the time reference of the indoor base station.
And then intercepting the wireless frame data, and intercepting N complete wireless frame data lengths from the air interface data stream received in the initial synchronization stage according to the successful result of the primary synchronization, wherein N > =1.
The invention determines the downlink timing reference in the initial synchronization stage, intercepts the wireless frame data and is used as the reference for adjusting the subsequent real-time synchronization state, and has the characteristics of convenient acquisition and no need of depending hardware.
Based on any of the above embodiments, step S2 includes:
performing time-frequency conversion on the wireless frame data to obtain a corresponding downlink reference signal;
calculating Resource Block (RB) data occupied by the downlink reference signal based on Discrete Fourier Transform (DFT) channel estimation to obtain noise energy (RIP);
and obtaining a plurality of initial SNR statistic by the RIP, accumulating the plurality of initial SNR statistic, and then obtaining an average value to obtain the SNR threshold.
Specifically, when the signal-to-noise ratio of the initial synchronization stage is further calculated, firstly, time-frequency conversion processing is performed on the N complete radio frames, then, the corresponding downlink reference signals are taken out, the downlink reference signals are input into a channel estimation unit, noise energy (RIP) is calculated, and then, the signal-to-noise ratio (SNR) is obtained, and the signal-to-noise ratio threshold calculation mode is that the N obtained initial signal-to-noise ratio statistics are accumulated and then averaged.
Taking a TD-LTE base station as an example, firstly segmenting N pieces of cut wireless frame data according to the length of a system wireless frame, respectively carrying out cyclic prefix removal and FFT operation processing on the data of a subframe 1 or a subframe 9 in each 10ms wireless frame by taking a time domain symbol as a unit, then taking out Resource Block (RB) data occupied by a downlink reference signal from the data, inputting the Resource Block (RB) data into a channel estimation unit, obtaining noise energy (RIP) through DFT channel estimation, further obtaining a signal-to-noise ratio (SNR), and finally obtaining a signal-to-noise ratio threshold delta by averaging after accumulating N pieces of initial signal-to-noise ratio statistics obtained above.
Here, the air interface listening unit detection period may be set to 2 n Multiplied by 10ms, where n>=0 and n<=5, n is an integer.
The invention uses the signal-to-noise ratio and the signal-to-noise ratio threshold in the initial synchronization stage as the basis for judging whether the system needs to perform real-time synchronization, has the characteristics of simple calculation, convenient implementation and the like, and does not need additional hardware resources as support.
Based on any of the above embodiments, step S3 includes:
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, inverting the frame head relative offset value to obtain a first non-zero adjustment value, taking the first non-zero adjustment value as an adjustment step length to adjust the current timing reference position, and storing the first non-zero adjustment value into a cyclic array with a preset length;
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is smaller than the signal-to-noise ratio threshold, accumulating the frame header relative offset value to obtain an accumulated value, when the accumulated value reaches an adjustment threshold, inverting the accumulated value to obtain a second non-zero adjustment value, taking the second non-zero adjustment value as an adjustment step length to adjust the current timing reference position, storing the second non-zero adjustment value into a cyclic array with a preset length, and resetting the accumulated value;
if the real-time synchronization state is out-of-step and the signal-to-noise ratio in the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, accumulating the frame head relative offset value, and not adjusting the current timing reference position;
and if the real-time synchronization state is out-of-synchronization and the signal to noise ratio in the synchronization maintaining stage is smaller than the signal to noise ratio threshold, the processing is not performed.
Specifically, as shown in fig. 2, the timing reference adjustment strategy according to the present invention specifically includes:
(1) When the real-time state is synchronous and the SNR is higher than or equal to the signal-to-noise ratio threshold delta, the confidence of the air interface synchronous result is highest, and the internal clock control unit performs the synchronization on the periodically detected frame header relative offset value MFC offset Taking the inverse as the step length to instantly adjust the current timing reference position, and adjusting a non-zero adjustment value (-MFC) offset ) Saving to a cyclic array a with the length L;
(2) When the real-time state is synchronous and the SNR is lower than the SNR threshold delta, the internal clock control unit performs the synchronization on the periodically detected frame header relative offset value MFC offset Accumulating, when the absolute value of the accumulated value reaches the adjustment threshold beta, the internal clock control unit adds the accumulated value MFC sum Taking the inverse as step length to adjust the current timing reference position, and adjusting the adjustment value (-MFC) sum ) Saving to a cyclic array a, and simultaneously zeroing the accumulated value;
(3) When the real-time state is out-of-step and the SNR is higher than or equal to the SNR threshold, only accumulating the relative offset value of the frame head without adjusting the timing reference position;
(4) When the real-time state is out-of-step and the SNR is lower than the signal-to-noise threshold delta, the confidence of the air interface synchronization result is the lowest, and no processing is performed at this time.
Here, the cyclic array a defaults to store the last L adjustment values, and before each data writing, adds 1 to all element numbers in the cyclic array a and shifts the element content backward, i.e., a (L-1) =a (L-2), a (L-2) =a (L-3)..a (2) =a (1), a (1) =a (0), the original L-th element is covered, and finally, the current data is stored to the first array a (0).
The adjustment threshold β is set to T minimum time units, and the minimum time units are related to the system sampling rate, for example, a 20M bandwidth LTE system, where 30.72M sampling rate corresponds to β=tx (1/30720000) s.
The invention obtains the timing reference adjustment strategy and executes the timing reference adjustment strategy by comprehensively pre-judging the comparison result of the real-time state of the system and the SNR threshold, and can flexibly carry out dynamic compensation on the real-time state of the system by setting a cyclic array to store a plurality of adjustment values.
Based on any of the above embodiments, step S5 includes:
accumulating a plurality of adjustment values in the cyclic array to obtain a first accumulated value, taking the number of the plurality of adjustment values as a first precompensation period, adjusting a current timing reference position based on the first accumulated value and the first precompensation period, and determining a current synchronous state after the first precompensation period is finished;
if the first accumulated value is 0, removing the last adjusting value in the plurality of adjusting values, accumulating the remaining adjusting values to obtain a second accumulated value, subtracting 1 from the number of the plurality of adjusting values to obtain a second precompensation period, adjusting the current timing reference position based on the second accumulated value and the second precompensation period, and determining the current synchronous state after the second precompensation period is finished;
and similarly, if the real-time synchronous state is out-of-step in the current pre-compensation period, entering the next pre-compensation period to continue pre-compensation.
Specifically, as shown in fig. 3, the adaptive precompensation proposed by the present invention specifically includes:
and accumulating and summing L adjustment values stored in the current cyclic array to obtain an accumulated value Sum0, and adjusting the current timing reference position by the indoor base station by taking L as a period and Sum0 as a step length, detecting the current synchronous state after the current precompensation period is finished, and selecting to continue the precompensation process or exit the precompensation process according to the result.
Further, if Sum0 is 0, sum 1= Σ { a (0), a (1), …, a (L-2) } is continuously calculated, and the precompensation adjustment step size is changed to Sum1, and the precompensation period is changed to L-1.
The invention adopts a self-adaptive pre-compensation processing flow to dynamically adjust the adjustment value in the cyclic array according to whether the current state of the system meets the synchronous requirement, thereby realizing the real-time synchronous compensation of the system offset.
Based on any of the above embodiments, further comprising:
and if the real-time synchronous states are synchronous in a continuous preset number detection period after the current precompensation period is finished, closing the self-adaptive precompensation and recovering a timing reference adjustment mechanism.
After the current precompensation period is finished, the method continues to continuously detect X periods, if the real-time synchronous states are synchronous, the self-adaptive precompensation is closed, and the indoor base station resumes the timing reference adjustment mechanism so as to continuously maintain the air interface synchronous state. Here, X is a positive integer greater than 0, and the present invention sets X > =3 and X < L, ensuring that the detection period has a certain number but not infinite.
According to the invention, after the self-adaptive precompensation, the periodic detection is continuously supplemented, so that the self-adaptive precompensation flow is closed after the system enters a stable synchronous state, and the system resources are effectively saved.
The air interface synchronization system of the indoor division base station provided by the invention is described below, and the air interface synchronization system of the indoor division base station described below and the air interface synchronization method of the indoor division base station described above can be correspondingly referred to each other.
Fig. 4 is a schematic structural diagram of an air interface synchronization system of a indoor base station provided by the present invention, as shown in fig. 4, including: a first processing module 41, a second processing module 42, a third processing module 43, an adjustment module 44 and a precompensation module 45, wherein:
the first processing module 41 is configured to acquire synchronization information sent by a synchronization source base station, determine a downlink timing reference based on the synchronization information, and intercept wireless frame data; the second processing module 42 is configured to obtain an initial synchronization phase signal-to-noise ratio based on the radio frame data, and obtain a signal-to-noise ratio threshold according to the initial synchronization phase signal-to-noise ratio; the third processing module 43 is configured to obtain a downlink air interface signal according to a preset period, obtain a real-time synchronization state and a frame head relative offset value of a synchronization source base station according to the downlink air interface signal, and obtain a signal-to-noise ratio in a synchronization maintenance stage based on the frame head relative offset value; the adjustment module 44 is configured to determine a timing reference adjustment policy based on the real-time synchronization status and a comparison result between the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold; the pre-compensation module 45 is configured to perform adaptive pre-compensation if the real-time synchronization status is determined to be out of synchronization and synchronization is not recovered within a preset number of detection cycles.
According to the invention, the downlink signal of the synchronous source base station is periodically detected, the detection result is periodically counted, the frame head offset is estimated, and the self-adaptive pre-compensation adjustment is carried out on the timing reference of the indoor base station after the synchronization state is lost under the low signal-to-noise ratio environment, so that the air interface synchronization state is maintained, the auxiliary synchronization equipment such as a GPS (global positioning system) is not needed, and the frequency channel is not needed to be frequently switched by frequently replacing the synchronization frequency point, so that the stability of the air interface synchronization state of the indoor base station under the complex environment is effectively improved on the premise of not increasing the hardware cost of the base station and realizing low complexity, and the application scene range of the indoor base station is enlarged.
Fig. 5 illustrates a physical schematic diagram of an electronic device, as shown in fig. 5, which may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method of room-dividing base station air interface synchronization, the method comprising: acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data; acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio; acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value; determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold; and if the real-time synchronous state is judged to be out of step and the synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program, when executed by a processor, can perform a room division base station air interface synchronization method provided by the above methods, and the method includes: acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data; acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio; acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value; determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold; and if the real-time synchronous state is judged to be out of step and the synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation.
In yet another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the indoor unit base station air interface synchronization method provided by the above methods, the method comprising: acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data; acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio; acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value; determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold; and if the real-time synchronous state is judged to be out of step and the synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An air interface synchronization method of a cell division base station is characterized by comprising the following steps:
acquiring synchronization information sent by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting wireless frame data;
acquiring an initial synchronization stage signal-to-noise ratio based on the wireless frame data, and acquiring a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio;
acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value;
determining a timing reference adjustment strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold;
and if the real-time synchronous state is judged to be out of step and the synchronization is not recovered within the preset detection period times, performing self-adaptive pre-compensation.
2. The indoor-division base station air interface synchronization method according to claim 1, wherein acquiring synchronization information transmitted by a synchronization source base station, determining a downlink timing reference based on the synchronization information, and intercepting radio frame data, comprises:
determining an air interface time sequence of an air interface data stream and the position of a synchronizing signal in a wireless frame based on the synchronizing information, calculating to obtain a frame head initial position of a synchronizing source base station, and taking the frame head initial position of the synchronizing source base station as the downlink timing reference;
and based on the downlink timing reference, intercepting a plurality of wireless frame data from the air interface data stream.
3. The indoor-division base station air interface synchronization method according to claim 1, wherein obtaining an initial synchronization stage signal-to-noise ratio based on the radio frame data, and obtaining a signal-to-noise ratio threshold according to the initial synchronization stage signal-to-noise ratio, comprises:
performing time-frequency conversion on the wireless frame data to obtain a corresponding downlink reference signal;
calculating Resource Block (RB) data occupied by the downlink reference signal based on Discrete Fourier Transform (DFT) channel estimation to obtain noise energy (RIP);
and obtaining a plurality of initial SNR statistic by the RIP, accumulating the plurality of initial SNR statistic, and then obtaining an average value to obtain the SNR threshold.
4. The indoor-division base station air interface synchronization method of claim 1, wherein determining a timing reference adjustment strategy based on the real-time synchronization state and a comparison of the signal-to-noise ratio of the synchronization hold phase and the signal-to-noise ratio threshold comprises:
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, inverting the frame head relative offset value to obtain a first non-zero adjustment value, taking the first non-zero adjustment value as an adjustment step length to adjust the current timing reference position, and storing the first non-zero adjustment value into a cyclic array with a preset length;
if the real-time synchronization state is synchronous and the signal-to-noise ratio of the synchronization maintaining stage is smaller than the signal-to-noise ratio threshold, accumulating the frame header relative offset value to obtain an accumulated value, when the accumulated value reaches an adjustment threshold, inverting the accumulated value to obtain a second non-zero adjustment value, taking the second non-zero adjustment value as an adjustment step length to adjust the current timing reference position, storing the second non-zero adjustment value into a cyclic array with a preset length, and resetting the accumulated value;
if the real-time synchronization state is out-of-step and the signal-to-noise ratio in the synchronization maintaining stage is greater than or equal to the signal-to-noise ratio threshold, accumulating the frame head relative offset value, and not adjusting the current timing reference position;
and if the real-time synchronization state is out-of-synchronization and the signal to noise ratio in the synchronization maintaining stage is smaller than the signal to noise ratio threshold, the processing is not performed.
5. The method for air interface synchronization of a cell division base station according to claim 4, wherein if it is determined that the real-time synchronization state is out of synchronization and synchronization is not recovered within a preset number of detection cycles, performing adaptive pre-compensation, comprising:
accumulating a plurality of adjustment values in the cyclic array to obtain a first accumulated value, taking the number of the plurality of adjustment values as a first precompensation period, adjusting a current timing reference position based on the first accumulated value and the first precompensation period, and determining a current synchronous state after the first precompensation period is finished;
if the first accumulated value is 0, removing the last adjusting value in the plurality of adjusting values, accumulating the remaining adjusting values to obtain a second accumulated value, subtracting 1 from the number of the plurality of adjusting values to obtain a second precompensation period, adjusting the current timing reference position based on the second accumulated value and the second precompensation period, and determining the current synchronous state after the second precompensation period is finished;
and similarly, if the real-time synchronous state is out-of-step in the current pre-compensation period, entering the next pre-compensation period to continue pre-compensation.
6. The indoor-division base station air interface synchronization method according to claim 5, further comprising:
and if the real-time synchronous states are synchronous in a continuous preset number detection period after the current precompensation period is finished, closing the self-adaptive precompensation and recovering a timing reference adjustment mechanism.
7. An air interface synchronization system of a cell division base station, comprising:
the first processing module is used for acquiring the synchronization information sent by the synchronization source base station, determining a downlink timing reference based on the synchronization information and intercepting wireless frame data;
the second processing module is used for acquiring the signal-to-noise ratio of the initial synchronization stage based on the wireless frame data and acquiring a signal-to-noise ratio threshold according to the signal-to-noise ratio of the initial synchronization stage;
the third processing module is used for acquiring a downlink air interface signal according to a preset period, acquiring a real-time synchronization state and a frame head relative offset value of a synchronization source base station by the downlink air interface signal, and acquiring a signal-to-noise ratio in a synchronization maintaining stage based on the frame head relative offset value;
the adjusting module is used for determining a timing reference adjusting strategy based on the real-time synchronization state and the comparison result of the signal-to-noise ratio of the synchronization maintaining stage and the signal-to-noise ratio threshold;
and the pre-compensation module is used for carrying out self-adaptive pre-compensation if the real-time synchronous state is judged to be out-of-step and the synchronization is not recovered within the preset detection period times.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the indoor unit air interface synchronization method according to any one of claims 1 to 6 when the program is executed.
9. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor performs the steps of the indoor unit air interface synchronization method according to any of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111357005.6A CN114126033B (en) | 2021-11-16 | 2021-11-16 | Air interface synchronization method and system for indoor division base station |
| PCT/CN2022/103782 WO2023087738A1 (en) | 2021-11-16 | 2022-07-05 | Air interface synchronization method and system for indoor distribution base station |
| MX2023013423A MX2023013423A (en) | 2021-11-16 | 2022-07-05 | Air interface synchronization method and system for indoor distribution base station. |
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| CN202111357005.6A CN114126033B (en) | 2021-11-16 | 2021-11-16 | Air interface synchronization method and system for indoor division base station |
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| CN102014405A (en) * | 2009-12-24 | 2011-04-13 | 大唐移动通信设备有限公司 | Base station and synchronous processing method thereof in layered network |
| CN103369552A (en) * | 2012-03-27 | 2013-10-23 | 普天信息技术研究院有限公司 | User synchronization and de-synchronization judging method |
| CN103813436A (en) * | 2012-11-05 | 2014-05-21 | 京信通信***（中国）有限公司 | Method for synchronizing household base station air interface, apparatus, and household base station |
| WO2016082779A1 (en) * | 2014-11-28 | 2016-06-02 | 电信科学技术研究院 | Network interception-based air interface synchronization method and device |
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| US8010138B2 (en) * | 2007-08-15 | 2011-08-30 | Nokia Corporation | Alternate mobile network cell synchronization |
| CN102769906B (en) * | 2012-05-29 | 2018-09-25 | 南京中兴软件有限责任公司 | A kind of synchronous method of family type base station and family type base station |
| CN106304162A (en) * | 2016-08-04 | 2017-01-04 | 福建三元达网络技术有限公司 | The method and system of seamless switching synchronisation source |
| CN114126033B (en) * | 2021-11-16 | 2023-07-11 | 中信科移动通信技术股份有限公司 | Air interface synchronization method and system for indoor division base station |
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- 2021-11-16 CN CN202111357005.6A patent/CN114126033B/en active Active
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- 2022-07-05 WO PCT/CN2022/103782 patent/WO2023087738A1/en active Application Filing
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102014405A (en) * | 2009-12-24 | 2011-04-13 | 大唐移动通信设备有限公司 | Base station and synchronous processing method thereof in layered network |
| CN103369552A (en) * | 2012-03-27 | 2013-10-23 | 普天信息技术研究院有限公司 | User synchronization and de-synchronization judging method |
| CN103813436A (en) * | 2012-11-05 | 2014-05-21 | 京信通信***（中国）有限公司 | Method for synchronizing household base station air interface, apparatus, and household base station |
| WO2016082779A1 (en) * | 2014-11-28 | 2016-06-02 | 电信科学技术研究院 | Network interception-based air interface synchronization method and device |
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| MX2023013423A (en) | 2023-12-12 |
| CN114126033A (en) | 2022-03-01 |
| WO2023087738A1 (en) | 2023-05-25 |
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