CN111770504A - Method and device for determining occupancy rate of downlink resources of WCDMA (wideband code division multiple Access) base station - Google Patents
Method and device for determining occupancy rate of downlink resources of WCDMA (wideband code division multiple Access) base station Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The embodiment of the application provides a method and a device for determining occupancy rate of downlink resources of a WCDMA base station, and relates to the technical field of mobile wireless communication.
Description
Technical Field
The application relates to the technical field of mobile wireless communication, in particular to a method and a device for determining the occupancy rate of downlink resources of a WCDMA (wideband code division multiple access) base station.
Background
Aiming at the technical field of mobile wireless communication, along with the increase of the number of users and the improvement of bandwidth and transmission rate, people have greater and greater requirements on frequency spectrum resources, so that the frequency spectrum resources are increasingly deficient. With the proposal of new technologies, the contradiction between supply and demand of spectrum resources is more and more prominent, and new requirements and challenges are brought to the requirements, planning configuration and using modes of related spectrum resources by the new technologies, scenes and service characteristics. How to solve the scarcity of spectrum resources becomes an important problem to be researched in the development process of wireless communication.
There are two main approaches to solving the shortage of spectrum resources, one is to increase the bandwidth, and the other is to improve the spectrum efficiency. At present, the development of millimeter waves is still in a starting stage, and it is not practical to use millimeter waves to solve the problem of the shortage of spectrum resources at present, so how to efficiently use spectrum resources becomes a key point of current research. The determination of the occupancy rate of the downlink resources can more conveniently and scientifically determine the frequency band with lower use frequency or application, so as to optimize the use of the frequency spectrum, which is beneficial to improving the utilization efficiency of the frequency spectrum, and especially for a Wideband Code Division Multiple Access (WCDMA) base station, the detection method of the occupancy rate of the downlink resources is not complete enough, so that a method capable of determining the occupancy rate of the downlink resources of the WCDMA base station is urgently needed.
Disclosure of Invention
The embodiment of the application aims to provide a method and a device for determining the occupancy rate of the downlink resources of a WCDMA (wideband code division multiple access) base station so as to determine the occupancy rate of the downlink resources of the WCDMA base station. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a method for determining a downlink resource occupancy rate of a WCDMA base station, where the method includes:
acquiring a downlink signal of a Wideband Code Division Multiple Access (WCDMA) base station;
carrying out time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary and a data frame header position corresponding to the downlink signal;
analyzing signals in a control channel in the downlink signals based on the main scrambling code group number and the frame head position of the data frame to obtain service data channel information, wherein the service data channel information represents a channel code of a service channel where the service data signals are located and the position of the service data signals in the service channel;
extracting service data signals from each service channel of the downlink signals according to the service data channel information;
judging whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein the code channel comprises the control channel and the service channel;
and obtaining the occupancy rate of the WCDMA base station downlink resources according to the occupancy condition of each time slot in the code channel corresponding to each channel code.
Optionally, the analyzing the data in the control channel in the downlink signal based on the main scrambling code group number and the frame header position of the data frame to obtain the service data channel information includes:
analyzing the pilot signal in the control channel by using each primary scrambling code corresponding to the primary scrambling code group number, and taking the primary scrambling code corresponding to the correct analysis result as a target primary scrambling code;
and analyzing the data in the control physical channel in the downlink signal based on a preset control channel spreading code, the target main scrambling code and the frame head position of the data frame to obtain service data channel information.
Optionally, the determining, based on the time slot boundary, the signal in the control channel, and the service data signal, whether a data signal exists in each time slot of each code channel to obtain an occupation situation of each time slot in the code channel corresponding to each channel code includes:
respectively calculating the fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal;
calculating the energy parameter of each time slot of each code channel according to the fourth-order cumulant of each time slot of each code channel, wherein for any time slot, the energy parameter of the time slot is in negative correlation with the absolute value of the fourth-order cumulant of the time slot;
and respectively judging whether the energy parameter of each time slot is in a preset value interval, so as to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein for each time slot, if the energy parameter of the time slot is in the preset value interval, the data signal is judged to exist in the time slot, otherwise, the data signal does not exist in the time slot.
Optionally, the calculating the fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal includes:
respectively determining signals of each time slot of each code channel based on the time slot boundary, the signals in the control channel and the service data signals;
aiming at each time slot, calculating a fourth order mixing moment and a second order mixing moment of the time slot according to the signal of the time slot;
and for each time slot, calculating the fourth-order cumulant of the time slot according to the fourth-order mixing moment and the second-order mixing moment of the time slot, thereby obtaining the fourth-order cumulant of each time slot of each code channel.
Optionally, the determining the signal of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal respectively includes:
respectively determining the signal of each time slot of each code channel based on the time slot boundary and the service data signal:
wherein r isi(k) Signal representing the k-th time slot in a code channel with channel code i, EikDenotes the average energy of the subcarriers in the k-th time slot in the code channel with channel code i, ai(k) Representing the signal code element sequence after the average power normalization of the k time slot in the code channel with the channel code i, theta represents the initial phase difference, ni(k) A zero-mean Gaussian white noise sequence representing the k-th time slot in the code channel with channel code i, k ∈ [1, N]And k is an integer, N represents the total number of time slots in a code channel, i ∈ [0, SF]And i is an integer, SF denotes a spreading factor, ejθIs the sign of the phase.
Optionally, the obtaining the occupancy rate of the downlink resource of the WCDMA base station according to the occupancy of each time slot in the code channel corresponding to each channel code includes:
generating a downlink resource occupation decision matrix according to the occupation situation of each time slot in a code channel corresponding to each channel code, wherein each element of the downlink resource occupation decision matrix corresponds to one time slot, and when the occupation situation of the time slot indicates that a data signal exists in the time slot, the element value corresponding to the time slot is 1, and when the occupation situation of the time slot indicates that the data signal does not exist in the time slot, the element value corresponding to the time slot is 0;
and calculating the average value of each element in the downlink resource occupation judgment matrix to obtain the downlink resource occupation rate of the WCDMA base station.
Optionally, a row of elements in the downlink resource occupation decision matrix corresponds to an occupation situation of each time slot in a code channel, and each code channel corresponds to a channel code, where the method further includes:
and calculating the average value of each row element in the downlink resource occupation judgment matrix to respectively obtain the resource occupation rate of the code channel corresponding to each channel code.
In a second aspect, an embodiment of the present application provides a device for determining a downlink resource occupancy rate of a WCDMA base station, where the device includes:
a downlink signal obtaining module, configured to obtain a downlink signal of a wideband code division multiple access WCDMA base station;
a downlink signal synchronization module, configured to perform time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary, and a data frame header position corresponding to the downlink signal;
a control channel analysis module, configured to analyze a signal in a control channel in the downlink signal based on the main scrambling code group number and the frame header position of the data frame to obtain service data channel information, where the service data channel information indicates a channel code of a service channel where the service data signal is located and a position of the service data signal in the service channel;
a data signal extraction module, configured to extract a service data signal from each service channel of the downlink signal according to the service data channel information;
a data signal judgment module, configured to judge whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal, so as to obtain an occupation situation of each time slot in the code channel corresponding to each channel code, where the code channel includes a control channel and a service channel;
and the resource occupancy determining module is used for obtaining the downlink resource occupancy of the WCDMA base station according to the occupancy condition of each time slot in the code channel corresponding to each channel code.
Optionally, the control channel analyzing module is specifically configured to: analyzing the pilot signal in the control channel by using each primary scrambling code corresponding to the primary scrambling code group number, and taking the primary scrambling code corresponding to the correct analysis result as a target primary scrambling code; and analyzing the data in the control physical channel in the downlink signal based on a preset control channel spreading code, the target main scrambling code and the frame head position of the data frame to obtain service data channel information.
Optionally, the data signal determining module includes:
a fourth-order cumulant calculation submodule, configured to calculate a fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal, respectively;
the energy parameter calculation submodule is used for calculating the energy parameter of each time slot of each code channel according to the fourth-order cumulant of each time slot of each code channel, wherein the energy parameter of the time slot is in negative correlation with the absolute value of the fourth-order cumulant of the time slot aiming at any time slot;
and the occupation condition judgment submodule is used for respectively judging whether the energy parameter of each time slot is in a preset value interval so as to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein for each time slot, if the energy parameter of the time slot is in the preset value interval, the time slot is judged to have a data signal, and otherwise, the time slot is judged to have no data signal.
Optionally, the fourth-order cumulant calculation sub-module includes:
a time slot signal determining unit, configured to determine, based on the time slot boundary, the signal in the control channel, and the service data signal, a signal of each time slot of each code channel;
a mixing moment calculation unit, configured to calculate, for each timeslot, a fourth-order mixing moment and a second-order mixing moment of the timeslot according to a signal of the timeslot;
and the fourth-order cumulant determining unit is used for calculating the fourth-order cumulant of the time slot according to the fourth-order mixing moment and the second-order mixing moment of the time slot aiming at each time slot so as to obtain the fourth-order cumulant of each time slot of each code channel.
Optionally, the timeslot signal determination unit is specifically configured to:
respectively determining the signal of each time slot of each code channel based on the time slot boundary and the service data signal:
wherein r isi(k) Signal representing the k-th time slot in a code channel with channel code i, EikRepresenting channelsAverage energy of sub-carrier in k time slot in code channel of code i, ai(k) Representing the signal code element sequence after the average power normalization of the k time slot in the code channel with the channel code i, theta represents the initial phase difference, ni(k) A zero-mean Gaussian white noise sequence representing the k-th time slot in the code channel with channel code i, k ∈ [1, N]And k is an integer, N represents the total number of time slots in a code channel, i ∈ [0, SF]And i is an integer, SF denotes a spreading factor, ejθIs the sign of the phase.
Optionally, the resource occupancy determining module is specifically configured to: generating a downlink resource occupation decision matrix according to the occupation situation of each time slot in a code channel corresponding to each channel code, wherein each element of the downlink resource occupation decision matrix corresponds to one time slot, and when the occupation situation of the time slot indicates that a data signal exists in the time slot, the element value corresponding to the time slot is 1, and when the occupation situation of the time slot indicates that the data signal does not exist in the time slot, the element value corresponding to the time slot is 0; and calculating the average value of each element in the downlink resource occupation judgment matrix to obtain the downlink resource occupation rate of the WCDMA base station.
Optionally, a row of elements in the downlink resource occupation decision matrix corresponds to an occupation situation of each timeslot in a code channel, and each code channel corresponds to a channel code, where the apparatus further includes:
and a code channel resource occupancy rate determination module. And the average value of each row element in the downlink resource occupation judgment matrix is calculated to respectively obtain the resource occupation rate of the code channel corresponding to each channel code.
In a third aspect, an embodiment of the present application provides an electronic device, including a processor and a memory; the memory is used for storing a computer program; the processor is configured to implement the method according to any one of the first aspect when executing the program stored in the memory
In a fourth aspect, the present application provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the method of any one of the above first aspects.
In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method of any of the first aspects.
The method and the device for determining the occupancy rate of the downlink resources of the WCDMA base station, provided by the embodiment of the application, are used for acquiring the downlink signals of the WCDMA base station; carrying out time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary and a data frame header position corresponding to the downlink signal; analyzing signals in a control channel in a downlink signal based on a main scrambling code group number and a data frame header position to obtain service data channel information, wherein the service data channel information represents a channel code of a service channel where a service data signal is located and the position of the service data signal in the service channel; extracting service data signals from each service channel of the downlink signals according to the service data channel information; judging whether a data signal exists in each time slot of each code channel based on a time slot boundary, a signal in a control channel and a service data signal to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein the code channel comprises the control channel and the service channel; and obtaining the occupancy rate of the WCDMA base station downlink resources according to the occupancy condition of each time slot in the code channel corresponding to each channel code. Starting from the decoding of the downlink physical layer of the WCDMA base station at the bottom layer, the cell search and synchronization of the received data are carried out before the downlink signal is evaluated, the validity of the data is ensured, then the data is demodulated and analyzed, the fact that the evaluated data information is effectively utilized by users is ensured, the validity of the downlink signal can be ensured, the synchronization frequency can be automatically and dynamically adjusted according to the calculation capacity and the requirement, the evaluation result is more credible, the signal intensity is not required to be assumed to be stable in the measurement time, and the occupancy rate of the downlink resources of the WCDMA base station in different scenes of different regions can be realized. Of course, not all advantages described above need to be achieved at the same time in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a method for determining a downlink resource occupancy rate of a WCDMA base station according to an embodiment of the present application;
fig. 2 is a schematic diagram of a time slot division in a downlink signal according to an embodiment of the present application;
fig. 3 is a diagram of a spreading code tree according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating an implementation manner of step S13 in the embodiment shown in FIG. 1 of the present application;
FIG. 5 is a diagram illustrating scrambling code group grouping according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating an implementation manner of step S15 in the embodiment shown in FIG. 1 of the present application;
FIG. 7 is a diagram illustrating an implementation manner of step S151 in the embodiment shown in FIG. 6 of the present application;
FIG. 8 is a diagram illustrating an implementation manner of step S16 in the embodiment shown in FIG. 1 of the present application;
FIG. 9 is a diagram illustrating an analysis report of a WCDMA system according to an embodiment of the present application;
FIG. 10 is a schematic diagram of occupancy rates of code channels according to an embodiment of the present application;
fig. 11 is a schematic diagram of a device for determining occupancy of downlink resources of a WCDMA base station according to an embodiment of the present application;
fig. 12 is a schematic diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to determine the occupancy rate of the downlink resource of the WCDMA base station, an embodiment of the present application provides a method for determining the occupancy rate of the downlink resource of the WCDMA base station, and referring to fig. 1, the method includes:
s11, acquiring the downlink signal of the WCDMA base station.
The method for determining the occupancy rate of the downlink resource of the WCDMA base station in the embodiment of the application can be implemented by an electronic device, and specifically, the electronic device can be a base station or other devices with a signal acquisition function.
In order to evaluate the resource element utilization rate of the downlink signal of the WCDMA base station in different scenes in different areas and know the service carrying condition of the downlink signal, the downlink signal (downlink radio frequency signal) of the WCDMA base station needs to be sampled and received in a non-cooperative mode to obtain the downlink signal of the WCDMA base station. The downlink signal should include at least one frame of complete data to ensure successful parsing of the traffic data channel information. In order to improve the accuracy of the subsequent time slot synchronization and frame synchronization, a plurality of frames of data can be selected.
And S12, carrying out time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary and a data frame header position corresponding to the downlink signal.
Time slot synchronization is carried out on the downlink signal, the position of a time slot boundary is determined, frame synchronization is carried out on the downlink signal, a frame boundary (including the position of a data frame header) is obtained, and then a main scrambling code group number used by the WCDMA base station is obtained.
And S13, analyzing the signal in the control channel in the downlink signal based on the main scrambling code group number and the frame header position of the data frame to obtain service data channel information, wherein the service data channel information indicates the channel code of the service channel where the service data signal is located and the position of the service data signal in the service channel.
The service data channel information indicates a channel code of a service channel where the service data signal is located and a position of the service data signal in the service channel, for example, the channel code of the service channel may include information of a service channel scrambling code, a spreading code, a starting position of the service data signal, and the like. Based on the main scrambling code indicated by the main scrambling code group number and the frame head position of the data frame, channel demodulation, broadcast message analysis and control information analysis are carried out on a control channel in a downlink signal, and a section of bit stream which has practical significance and contains upper layer information is obtained after physical layer analysis, channel decoding and Cyclic Redundancy Check (CRC) of received data. And analyzing each bit one by one to obtain the service data channel information.
For example, the control channel may specifically be a P-CCPCH (primary common control physical channel), and the steps of demodulating, deinterleaving, viterbi decoding, CRC checking, and the like may be performed on the P-CCPCH signal by using a primary scrambling code and a spreading code indicated by a primary scrambling code group number, so as to obtain a segment of bit stream carrying the control signaling. And each bit is parsed one by one, and the system message is extracted from each bit. The system message may include protocol level indicators such as MNC (mobile device network code), MCC (mobile device country code), cell ID, etc., and related configuration information of the second common control physical channel, i.e., traffic data channel information, including information such as traffic channel scrambling code, spreading code, start position, etc.
S14, extracting a service data signal from each service channel of the downlink signal according to the service data channel information.
The service data channel information indicates a channel code of a service channel where the service data signal is located and a position of the service data signal in the service channel, and each service data signal is extracted at a corresponding position in the corresponding service channel according to the service data channel information.
And S15, judging whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal, and obtaining the occupation condition of each time slot in the code channel corresponding to each channel code, wherein the code channel comprises the control channel and the service channel.
The control channel and traffic channel are collectively referred to as a code channel,one channel code corresponds to one channel code. Dividing the downlink signal of each code channel into a plurality of time slots based on the time slot boundary, e.g. as shown in fig. 2, C1To CNFor N code channels, TCIs the duration of a time slot, TSThe number of time slots in each code channel is the same for the duration of the acquired downlink signal. Based on the signal in the control channel and the service data signal, it is respectively determined whether a data signal exists in each time slot of each code channel (where the data signal is a signal different from the noise signal, and the data signal may include the service data signal and the control data signal), so as to obtain the occupation situation of each time slot in each code channel. For any slot, the occupancy of that slot indicates whether a data signal is present in that slot.
And S16, obtaining the occupancy rate of the WCDMA base station downlink resources according to the occupancy condition of each time slot in the code channel corresponding to each channel code.
And summarizing the occupation situation of each time slot in each code channel so as to obtain the occupation degree of the downlink resources of the WCDMA base station. For example, the number of time slots in which the data signal exists may be divided by the total number of time slots in each code channel, so as to obtain the proportion of the time slots including the data signal, which is used as the downlink resource occupancy of the WCDMA base station.
In the embodiment of the application, the synchronization and decoding operation are carried out on the downlink signal of the WCDMA base station, the effectiveness of the downlink signal can be ensured, and the occupancy rate of the downlink resource of the WCDMA base station in different scenes of different regions can be realized.
In a possible implementation manner, the step S12 of performing slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a slot boundary, and a data frame header position corresponding to the downlink signal includes:
step one, time slot synchronization is carried out on the downlink signal, the position of a time slot boundary is determined, frame synchronization is carried out on the downlink signal, and a frame boundary (comprising the head position of a data frame) and a scrambling code group number of a scrambling code group used by a WCDMA base station are obtained.
The WCDMA base station uses different Spreading codes to distinguish different channels, and the Spreading code used is OVSF (Orthogonal Variable Spreading Factor )Variable spreading factor) codes generated from the code tree shown in fig. 3. In FIG. 3Cch,SF,kUniquely represents a spreading code, where ch is short for channel, SF represents a spreading factor, k represents a code number, and 0 ≦ k<And (4) SF. Each spreading code word is converted into chips in the order from left to right for transmission. The generation process can be described by the following formula:
Cch,1,0＝1
the WCDMA base station allocates a code channel to each channel, uses a spreading code corresponding to the code channel to perform spreading modulation and then transmits the code channel, and each common channel has a fixed code channel number and is allocated by the WCDMA base station without change. When a new user makes a call, the system randomly allocates a new code channel for the new user to perform data transmission, the code channel is called a traffic channel, and the traffic channel does not transmit data any more after the user finishes the call.
The receiver can be used to sample the downlink signal of the WCDMA base station to obtain the baseband signal. And carrying out time slot synchronization and frame synchronization on the baseband signals, and determining the boundary of the time slot and the frame head of the data. When the primary synchronization channel transmits the primary synchronization code, the signal is transmitted only on the first 256 chips of the time slot, and the matched peak value is obtained through matched filtering, so that the time slot synchronization is completed. Frame synchronization is accomplished by a secondary synchronization code. In a WCDMA base station 16 SSCs (secondary synchronization codes) are defined
Where k 1,2, 3.., 16, i is the SSC sequence number of the slot in which it is located. Each secondary synchronization code has a length of 256 chips, and by randomly combining the 16 SSCs, 64 different sets of secondary synchronization code combinations are generated, corresponding to 64 scrambling code groups, respectively. By accurately identifying the content and order of the set of secondary synchronization codes, one can findFrame boundary and scrambling code group number used by the cell.
And step two, traversing the primary scrambling code in the scrambling code group used by the WCDMA base station by using a signal of a Common Pilot Channel (CPICH), and determining the primary scrambling code through a correlation peak value so as to obtain a primary scrambling code group number.
In a possible implementation manner, referring to fig. 4, in the above S13, analyzing data in a control channel in the downlink signal based on the primary scrambling code group number and the header position of the data frame to obtain service data channel information includes:
s131, using each primary scrambling code corresponding to the primary scrambling code group number to analyze the pilot signal in the control channel, and using the primary scrambling code corresponding to the correct analysis result as the target primary scrambling code.
And obtaining the target primary scrambling code by combining the obtained primary scrambling code group number with the analysis of the common pilot channel. The pilot signal transmitted by the CPICH in the non-diversity case is known, as is the spreading code. And the main scrambling codes in the main scrambling code group are used for carrying out descrambling on the pilot channels one by one, and then channelization is removed, so that the main scrambling code with the correct despreading result is the target main scrambling code.
As shown in fig. 5, there are 8192 scrambling codes in the downlink of the WCDMA base station, where the total number of the primary scrambling codes is 512, which are divided into 64 groups, each primary scrambling code corresponds to 15 secondary scrambling codes, and the number of the primary scrambling code group in each cell is the same as the number of the secondary synchronization code. In addition, the primary common pilot channel in the WCDMA base station is a section of established sequence, modulated, spread, scrambled, and then transmitted to the air, and the spreading code is determined, so that it can descramble the P-CPICH (basic common pilot channel) of the known sequence by using 8 primary scrambling codes in the primary scrambling code group in a traversal manner, and the primary scrambling code corresponding to the correct analysis result is used as the target primary scrambling code.
S132, analyzing the data in the control physical channel in the downlink signal based on the preset control channel spreading code, the target main scrambling code and the frame head position of the data frame to obtain the service data channel information.
Using primary scrambling and spreading codes Cch,256,1Demodulating, de-interleaving, Viterbi decoding, CRC checking and other steps are carried out on the main common control physical channel, and a section of bit stream bearing the control signaling can be restored; each bit is then parsed one by one to extract the system message including the traffic data channel information therefrom. The system message may also include protocol level indicators such as MNC, MCC, cell ID, etc. The traffic data channel information may include information such as traffic channel scrambling code, spreading code, start position, etc.
In the embodiment of the application, the pilot signal in the control channel is analyzed, so that the signal in the control channel and the service data signal are ensured to be real and effective, and the reliability of the occupancy rate of the downlink resource of the WCDMA base station is high.
In one possible implementation manner, referring to fig. 6, in the above S15, the determining whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the traffic data signal, and obtaining an occupation status of each time slot in a code channel corresponding to each channel code includes:
and S151, respectively calculating the fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal.
And respectively determining the signals in each time slot of each code channel based on the time slot boundary, the signals in the control channel and the service data signals, and respectively calculating the fourth-order cumulant of the signals in each time slot to obtain the fourth-order cumulant of each time slot of each code channel.
S152, calculating the energy parameter of each time slot of each code channel according to the fourth-order cumulant of each time slot of each code channel, wherein for any time slot, the energy parameter of the time slot is in negative correlation with the absolute value of the fourth-order cumulant of the time slot.
For any time slot, the energy parameter of the time slot is inversely related to the absolute value of the fourth-order cumulant of the time slot, and the larger the absolute value of the fourth-order cumulant of the time slot is, the smaller the energy parameter of the time slot is. Optionally, possible values of the accumulated quantities of each order under different modulation modes may be as shown in table 1.
TABLE 1
QPSK, 16QAM and 64QAM are different modulation modes, E represents the energy of the signal, and the fourth-order cumulant C can be seen40Capable of amplifying the influence of signal energy, therefore, C is selected in the embodiment of the present application40The energy parameter is expressed, so that the identification degree of the data signal energy and the noise signal energy is increased by using the energy parameter, and the noise signal and the data signal can be more accurately distinguished.
And S153, respectively judging whether the energy parameter of each time slot is in a preset value interval, so as to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein for each time slot, if the energy parameter of the time slot is in the preset value interval, judging that a data signal exists in the time slot, otherwise, judging that the data signal does not exist in the time slot.
The energy parameter may be defined as M ═ 1/| C40Where M is an energy parameter, C40For fourth order cumulants, the energy parameter is used to distinguish between the noise signal and the data signal. The value range of the M value of the time slot is 0<M<1, it is determined that a data signal exists in the time slot. The noise signal energy is low, and the value of M should be large, and M of a time slot is generally in the order of 10 to the k power, i.e. M is 10kAnd k is 1,2,3, so that when M is greater than 1, it is determined that the time slot is a noise signal, i.e., no data signal exists in the time slot.
Optionally, a modulation parameter F ═ C may also be defined40|/|C21|2The possible values of M and F in different modulation modes can be shown in table 2.
TABLE 2
| M＝1/|C40| | F＝|C40|/|C21|2 | |
| AWGN | 10k | - |
| QPSK | (0,1) | 1 |
| 16QAM | (0,1) | 0.68 |
| 64QAM | (0,1) | 0.61 |
In a possible implementation manner, referring to fig. 7, in step S151, the calculating a fourth-order cumulative quantity of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the traffic data signal includes:
s1511, respectively determining the signal of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal.
Optionally, the determining the signal of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal respectively includes:
respectively determining the signal of each time slot of each code channel based on the time slot boundary and the service data signal:
wherein r isi(k) Signal representing the k-th time slot in a code channel with channel code i, EikDenotes the average energy of the subcarriers in the k-th time slot in the code channel with channel code i, ai(k) Representing the signal code element sequence after the average power normalization of the k time slot in the code channel with the channel code i, theta represents the initial phase difference, ni(k) A zero-mean Gaussian white noise sequence representing the k-th time slot in the code channel with channel code i, k ∈ [1, N]And k is an integer, N represents the total number of time slots in a code channel, i ∈ [0, SF]And i is an integer, SF denotes a spreading factor, ejθIs the sign of the phase.
S1512, for each timeslot, according to the signal of the timeslot, calculate the fourth order mixing moment and the second order mixing moment of the timeslot.
A complex random process x (n) with zero mean, and the formula for calculating the p-order mixing moment can be expressed as:
Mpq＝E[X(n)p-qX*(n)q]
wherein, X*(n) denotes the conjugate of X (n), p denotes the order, and p denotes<q。
For the signal of each time slot, a fourth order mixing moment M of the time slot can be determined40And a second order mixing moment M20。
S1513, for each time slot, according to the fourth order mixing moment and the second order mixing moment of the time slot, calculating the fourth order cumulant of the time slot, thereby obtaining the fourth order cumulant of each time slot of each code channel.
The fourth order cumulative amount for each time slot may be calculated according to the following equation: c40＝M40-3 M20 2。
In a possible implementation manner, referring to fig. 8, in the above S16, obtaining the occupancy rate of the WCDMA base station downlink resource according to the occupancy of each timeslot in the code channel corresponding to each channel code, includes:
and S161, generating a downlink resource occupation decision matrix according to the occupation situation of each time slot in the code channel corresponding to each channel code, where each element of the downlink resource occupation decision matrix corresponds to one time slot, and when the occupation situation of the time slot indicates that a data signal exists in the time slot, an element value corresponding to the time slot is 1, and when the occupation situation of the time slot indicates that a data signal does not exist in the time slot, an element value corresponding to the time slot is 0.
The values of the elements corresponding to the occupation status of the timeslot can be set according to the practical situation, where 1 and 0 are common settings, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application are included in the protection scope of the present application.
And S162, calculating the average value of each element in the downlink resource occupation judgment matrix to obtain the downlink resource occupation rate of the WCDMA base station.
Optionally, after the occupancy rate of the downlink resource of the WCDMA base station is obtained, an analysis report of the WCDMA system may be generated, for example, as shown in fig. 9. Where LAC is a location area code), AICH is an acquisition indicator channel, PICH is a paging indicator channel, SCCPCH is a secondary common control physical channel, QPSK is quadrature phase shift keying, and it is a digital modulation scheme.
In a possible implementation manner, a row of elements in the downlink resource occupation decision matrix corresponds to an occupation situation of each timeslot in a code channel, and each code channel corresponds to a channel code, where the method further includes:
and calculating the average value of each row element in the downlink resource occupation judgment matrix to respectively obtain the resource occupation rate of the code channel corresponding to each channel code.
Alternatively, one possible code channel resource occupancy situation may be as shown in fig. 10. The DPCH is a dedicated physical channel (i.e., a traffic channel), and the S-CCPCH is a secondary common control physical channel.
In the embodiment of the application, besides the total downlink resource occupancy of the WCDMA base station, the resource occupancy of each code channel can be calculated, so that various user requirements can be met,
an embodiment of the present application further provides a device for determining occupancy of downlink resources of a WCDMA base station, referring to fig. 11, where the device includes:
a downlink signal acquiring module 201, configured to acquire a downlink signal of a WCDMA base station;
a downlink signal synchronization module 202, configured to perform time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary, and a data frame header position corresponding to the downlink signal;
a control channel analyzing module 203, configured to analyze a signal in a control channel in the downlink signal based on the main scrambling code group number and the frame header position of the data frame to obtain service data channel information, where the service data channel information indicates a channel code of a service channel where the service data signal is located and a position of the service data signal in the service channel;
a data signal extracting module 204, configured to extract a service data signal from each service channel of the downlink signal according to the service data channel information;
a data signal determining module 205, configured to determine whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal, so as to obtain an occupation situation of each time slot in the code channel corresponding to each channel code, where the code channel includes a control channel and a service channel;
and a resource occupancy determining module 206, configured to obtain the occupancy of the downlink resource of the WCDMA base station according to the occupancy of each time slot in the code channel corresponding to each channel code.
Optionally, the control channel analyzing module is specifically configured to: analyzing the pilot signal in the control channel by using each primary scrambling code corresponding to the primary scrambling code group number, and taking the primary scrambling code corresponding to the correct analysis result as a target primary scrambling code; and analyzing the data in the control physical channel in the downlink signal based on a preset control channel spreading code, the target main scrambling code and the frame head position of the data frame to obtain service data channel information.
Optionally, the data signal determining module includes:
a fourth-order cumulant calculation submodule, configured to calculate a fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal, respectively;
the energy parameter calculation submodule is used for calculating the energy parameter of each time slot of each code channel according to the fourth-order cumulant of each time slot of each code channel, wherein the energy parameter of the time slot is in negative correlation with the absolute value of the fourth-order cumulant of the time slot aiming at any time slot;
and the occupation condition judgment submodule is used for respectively judging whether the energy parameter of each time slot is in a preset value interval so as to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein for each time slot, if the energy parameter of the time slot is in the preset value interval, the time slot is judged to have a data signal, and otherwise, the time slot is judged to have no data signal.
Optionally, the fourth-order cumulant calculation sub-module includes:
a time slot signal determining unit, configured to determine, based on the time slot boundary, the signal in the control channel, and the service data signal, a signal of each time slot of each code channel;
a mixing moment calculation unit, configured to calculate, for each timeslot, a fourth-order mixing moment and a second-order mixing moment of the timeslot according to a signal of the timeslot;
and the fourth-order cumulant determining unit is used for calculating the fourth-order cumulant of the time slot according to the fourth-order mixing moment and the second-order mixing moment of the time slot aiming at each time slot so as to obtain the fourth-order cumulant of each time slot of each code channel.
Optionally, the timeslot signal determination unit is specifically configured to:
respectively determining the signal of each time slot of each code channel based on the time slot boundary and the service data signal:
wherein r isi(k) Signal representing the k-th time slot in a code channel with channel code i, EikDenotes the average energy of the subcarriers in the k-th time slot in the code channel with channel code i, ai(k) Representing the signal code element sequence after the average power normalization of the k time slot in the code channel with the channel code i, theta represents the initial phase difference, ni(k) A zero-mean Gaussian white noise sequence representing the k-th time slot in the code channel with channel code i, k ∈ [1, N]And k is an integer, N represents the total number of time slots in a code channel, i ∈ [0, SF]And i is an integer, SF denotes a spreading factor, ejθIs the sign of the phase.
Optionally, the resource occupancy determining module is specifically configured to: generating a downlink resource occupation decision matrix according to the occupation situation of each time slot in a code channel corresponding to each channel code, wherein each element of the downlink resource occupation decision matrix corresponds to one time slot, and when the occupation situation of the time slot indicates that a data signal exists in the time slot, the element value corresponding to the time slot is 1, and when the occupation situation of the time slot indicates that the data signal does not exist in the time slot, the element value corresponding to the time slot is 0; and calculating the average value of each element in the downlink resource occupation judgment matrix to obtain the downlink resource occupation rate of the WCDMA base station.
Optionally, a row of elements in the downlink resource occupation decision matrix corresponds to an occupation situation of each timeslot in a code channel, and each code channel corresponds to a channel code, where the apparatus further includes:
and a code channel resource occupancy rate determination module. And the average value of each row element in the downlink resource occupation judgment matrix is calculated to respectively obtain the resource occupation rate of the code channel corresponding to each channel code.
An embodiment of the present application further provides an electronic device, including: a processor and a memory;
the memory is used for storing computer programs;
the processor is used for realizing the method for determining the occupancy rate of the downlink resources of any WCDMA base station when executing the computer program stored in the memory.
Optionally, referring to fig. 12, the electronic device according to the embodiment of the present application further includes a communication interface 902 and a communication bus 904, where the processor 901, the communication interface 902, and the memory 903 complete communication with each other through the communication bus 904.
The communication bus mentioned in the electronic device may be a PCI (Peripheral component interconnect) bus, an EISA (Extended Industry standard architecture) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a RAM (Random Access Memory) or an NVM (Non-Volatile Memory), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the method for determining an occupancy rate of a downlink resource of any WCDMA base station is implemented.
In another embodiment provided by the present application, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the above WCDMA base station downlink resource occupancy determination methods.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It should be noted that, in this document, the technical features in the various alternatives can be combined to form the scheme as long as the technical features are not contradictory, and the scheme is within the scope of the disclosure of the present application. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments of the apparatus, the electronic device, and the storage medium, since they are substantially similar to the method embodiments, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiments.
The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. A method for determining the occupancy rate of the downlink resources of a WCDMA base station is characterized by comprising the following steps:
acquiring a downlink signal of a Wideband Code Division Multiple Access (WCDMA) base station;
carrying out time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary and a data frame header position corresponding to the downlink signal;
analyzing signals in a control channel in the downlink signals based on the main scrambling code group number and the frame head position of the data frame to obtain service data channel information, wherein the service data channel information represents a channel code of a service channel where the service data signals are located and the position of the service data signals in the service channel;
extracting service data signals from each service channel of the downlink signals according to the service data channel information;
judging whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein the code channel comprises the control channel and the service channel;
and obtaining the occupancy rate of the WCDMA base station downlink resources according to the occupancy condition of each time slot in the code channel corresponding to each channel code.
2. The method according to claim 1, wherein the analyzing data in a control channel in the downlink signal based on the primary scrambling code group number and the frame header position of the data frame to obtain service data channel information comprises:
analyzing the pilot signal in the control channel by using each primary scrambling code corresponding to the primary scrambling code group number, and taking the primary scrambling code corresponding to the correct analysis result as a target primary scrambling code;
and analyzing the data in the control physical channel in the downlink signal based on a preset control channel spreading code, the target main scrambling code and the frame head position of the data frame to obtain service data channel information.
3. The method of claim 1, wherein the determining whether a data signal exists in each timeslot of each code channel based on the timeslot boundary, the signal in the control channel, and the service data signal to obtain an occupation status of each timeslot in a code channel corresponding to each channel code comprises:
respectively calculating the fourth-order cumulant of each time slot of each code channel based on the time slot boundary, the signal in the control channel and the service data signal;
calculating the energy parameter of each time slot of each code channel according to the fourth-order cumulant of each time slot of each code channel, wherein for any time slot, the energy parameter of the time slot is in negative correlation with the absolute value of the fourth-order cumulant of the time slot;
and respectively judging whether the energy parameter of each time slot is in a preset value interval, so as to obtain the occupation condition of each time slot in the code channel corresponding to each channel code, wherein for each time slot, if the energy parameter of the time slot is in the preset value interval, the data signal is judged to exist in the time slot, otherwise, the data signal does not exist in the time slot.
4. The method of claim 3, wherein the calculating the fourth-order cumulative amount of each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the traffic data signal comprises:
respectively determining signals of each time slot of each code channel based on the time slot boundary, the signals in the control channel and the service data signals;
aiming at each time slot, calculating a fourth order mixing moment and a second order mixing moment of the time slot according to the signal of the time slot;
and for each time slot, calculating the fourth-order cumulant of the time slot according to the fourth-order mixing moment and the second-order mixing moment of the time slot, thereby obtaining the fourth-order cumulant of each time slot of each code channel.
5. The method of claim 4, wherein the determining the signal of each slot of each code channel based on the slot boundary, the signal in the control channel, and the traffic data signal respectively comprises:
respectively determining the signal of each time slot of each code channel based on the time slot boundary and the service data signal:
wherein r isi(k) Signal representing the k-th time slot in a code channel with channel code i, EikDenotes the average energy of the subcarriers in the k-th time slot in the code channel with channel code i, ai(k) Representing the signal code element sequence after the average power normalization of the k time slot in the code channel with the channel code i, theta represents the initial phase difference, ni(k) Zero mean gaussian white noise sequence representing the k-th time slot in the code channel with channel code i，k∈[1,N]And k is an integer, N represents the total number of time slots in a code channel, i ∈ [0, SF]And i is an integer, SF denotes a spreading factor, ejθIs the sign of the phase.
6. The method of claim 1, wherein the obtaining the occupancy of the WCDMA base station downlink resources according to the occupancy of each timeslot in the code channel corresponding to each channel code comprises:
generating a downlink resource occupation decision matrix according to the occupation situation of each time slot in a code channel corresponding to each channel code, wherein each element of the downlink resource occupation decision matrix corresponds to one time slot, and when the occupation situation of the time slot indicates that a data signal exists in the time slot, the element value corresponding to the time slot is 1, and when the occupation situation of the time slot indicates that the data signal does not exist in the time slot, the element value corresponding to the time slot is 0;
and calculating the average value of each element in the downlink resource occupation judgment matrix to obtain the downlink resource occupation rate of the WCDMA base station.
7. The method of claim 6, wherein a row of elements in the downlink resource occupation decision matrix corresponds to occupation of time slots in a code channel, and each code channel corresponds to a channel code, the method further comprising:
and calculating the average value of each row element in the downlink resource occupation judgment matrix to respectively obtain the resource occupation rate of the code channel corresponding to each channel code.
8. A device for determining the occupancy rate of the downlink resources of a WCDMA base station is characterized by comprising the following components:
a downlink signal obtaining module, configured to obtain a downlink signal of a wideband code division multiple access WCDMA base station;
a downlink signal synchronization module, configured to perform time slot synchronization and frame synchronization on the downlink signal to obtain a main scrambling code group number, a time slot boundary, and a data frame header position corresponding to the downlink signal;
a control channel analysis module, configured to analyze a signal in a control channel in the downlink signal based on the main scrambling code group number and the frame header position of the data frame to obtain service data channel information, where the service data channel information indicates a channel code of a service channel where the service data signal is located and a position of the service data signal in the service channel;
a data signal extraction module, configured to extract a service data signal from each service channel of the downlink signal according to the service data channel information;
a data signal judgment module, configured to judge whether a data signal exists in each time slot of each code channel based on the time slot boundary, the signal in the control channel, and the service data signal, so as to obtain an occupation situation of each time slot in the code channel corresponding to each channel code, where the code channel includes a control channel and a service channel;
and the resource occupancy determining module is used for obtaining the downlink resource occupancy of the WCDMA base station according to the occupancy condition of each time slot in the code channel corresponding to each channel code.
9. An electronic device comprising a processor and a memory;
the memory is used for storing a computer program;
the processor, when executing the program stored in the memory, implementing the method of any of claims 1-7.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 7.
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Application publication date: 20201013 |
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