CN115913342B - Data frame processing method, device, home terminal base station, system and storage medium - Google Patents
Data frame processing method, device, home terminal base station, system and storage medium Download PDFInfo
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Abstract
The invention provides a data frame processing method, a device, a local terminal base station, a system and a storage medium, if first user data exists in a preset period, the local terminal base station sends a first data frame generated according to a fixed frame format to a satellite station at a data sending time node so that the satellite station respectively returns a first mixed data frame obtained by overlapping the first data frame and a reference data frame to the local terminal base station and an opposite terminal base station, the reference data frame is sent to the satellite station by the opposite terminal base station at the data sending time node, and the reference data frame is obtained by the opposite terminal base station according to the fixed frame format; and taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain second user data or a peer-to-peer null data sequence. According to the scheme, the data length corresponding to the fixed frame format is fixed, and the two base stations acquire the data frames transmitted by the data transmission time node according to the fixed frame format, so that the throughput of data transmission is improved.
Description
Technical Field
The present invention relates to the field of satellite communications, and in particular, to a data frame processing method, apparatus, home base station, system, and storage medium.
Background
In the existing satellite communication system, the ground base station encapsulates the user data to be transmitted and then transmits the encapsulated user data to the satellite station through the satellite link for forwarding to the ground base station at the opposite end, and the length of the encapsulated data in the data frame generally depends on the size of the user data to be transmitted.
The carrier superposition technology refers to a Paired Carrier Multiple Access (PCMA) two-way satellite communication technology based on transparent transponders, and aims at improving the frequency band utilization of satellite channels and saving bandwidth resources. The carrier superposition technology is utilized to construct a carrier superposition system, the carrier superposition system comprises two ground base stations and a satellite station, the satellite station can receive uplink signals sent by the two wireless base stations in the same frequency band, and the satellite station can serve as a transparent transponder to mix the two uplink signals into a mixed signal to return to the ground base station. In any terrestrial base station in the system, it is necessary to transmit an uplink signal to a satellite station at a fixed timing, and a mixed signal obtained by mixing a local signal (interference signal) with a terminal signal (useful signal) of another terrestrial base station is received.
However, in the carrier superposition system, the existing data encapsulation method cannot meet the requirement of data throughput.
Disclosure of Invention
The invention aims to provide a data frame processing method, a data frame processing device, a home base station, a system and a storage medium, so as to solve the problems existing in the prior art.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a data frame processing method, which is applied to a local base station of a carrier superposition system, where the carrier superposition system further includes a satellite station and an opposite base station, and the local base station is connected with the opposite base station through the satellite station in a communication manner; the method comprises the following steps:
if first user data exists in a preset period, generating a first data frame corresponding to the first user data according to a fixed frame format; the data length corresponding to the fixed frame format is fixed;
the first data frame is sent to the satellite station at a data sending time node reached in the preset period, so that the satellite station overlaps the first data frame and a reference data frame to obtain a first mixed data frame, and the first mixed data frame is returned to the home terminal base station and the opposite terminal base station respectively;
The reference data frame is sent to the satellite station by the data sending time node reached by the opposite terminal base station in the preset period, and the reference data frame is obtained by processing second user data or an opposite terminal blank data sequence by the opposite terminal base station according to the fixed frame format;
and taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain the second user data or the opposite terminal null data sequence.
In an alternative embodiment, the method further comprises:
if the first user data does not exist in the preset period, generating a local terminal null data sequence by using a hardware address of the node and a preset fixed sequence value at the data transmission time node;
generating a second data frame corresponding to the local null data sequence according to the fixed frame format;
sending the second data frame to the satellite station, so that the satellite station overlaps the second data frame and the reference data frame to obtain a second mixed data frame, and respectively returns the second mixed data frame to the local terminal base station and the opposite terminal base station;
And taking out the reference data frame from the second mixed data frame based on the second data frame, and analyzing the reference data frame according to the fixed frame format to obtain the second user data or the opposite terminal null data sequence.
In an alternative embodiment, the step of generating the local null data sequence by using the hardware address of the local null data sequence and a preset fixed sequence value includes:
taking the hardware address as an initial value of a first primitive polynomial to obtain a first random sequence;
taking the fixed sequence value as an initial value of a second primitive polynomial to obtain a second random sequence;
and performing exclusive OR operation on the first random sequence and the second random sequence to obtain the local null data sequence.
In an optional embodiment, the step of generating the second data frame corresponding to the local null data sequence according to the fixed frame format includes:
generating frame header and pilot frequency data, and determining preset modulation-demodulation parameters corresponding to a preset modulation-demodulation mode;
performing RM coding processing on the preset modulation-demodulation parameters to obtain preset RM coding data;
modulating the frame header and the preset RM coded data respectively, and modulating the local terminal null data sequence based on the preset modulation and demodulation mode to obtain a modulated frame header, preset RM coded data and a local terminal null data sequence;
According to the fixed frame format, assembling the pilot frequency data, the modulated frame header, preset RM coding data and a local terminal null data sequence to obtain a second initial data frame; the second initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing the modulated local terminal null data sequence, and the pilot frequency blocks are obtained by dividing the pilot frequency data;
and scrambling the second initial data frame to obtain the second data frame.
In an alternative embodiment, the step of generating the first data frame corresponding to the first user data according to a fixed frame format includes:
generating frame header and pilot frequency data, searching a preset modulation mapping table according to the size of the first user data, and determining modulation and demodulation parameters; wherein, the modulation and demodulation parameter reflects the modulation and demodulation mode of the first user data; the modulation mapping table comprises a modulation and demodulation mode adopted by mapping first user data with different sizes to a fixed frame length;
performing RM coding processing on the modulation-demodulation parameters to obtain RM coded data;
Scrambling and verifying value adding are carried out on the first user data, and processed user data are obtained;
coding the processed user data to obtain coded data;
modulating the frame header and the RM coded data respectively, and modulating the coded data based on the modulation and demodulation mode to obtain modulated frame header, RM coded data and coded data;
according to the fixed frame format, assembling the pilot frequency data, the modulated frame header, RM coded data and coded data to obtain a first initial data frame; the first initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing modulated coded data, and the pilot frequency blocks are obtained by dividing pilot frequency data;
and scrambling the first initial data frame to obtain the first data frame.
In an alternative embodiment, the fixed frame format includes a frame header, a modulation parameter, and payload data, where the payload data includes a plurality of data blocks and a plurality of pilot blocks, one pilot block exists between each two data blocks, and a data length of the payload data is fixed.
In a second aspect, the present invention provides a data frame processing apparatus, which is applied to a local base station of a carrier superposition system, where the carrier superposition system further includes a satellite station and an opposite base station, and the local base station is communicatively connected with the opposite base station through the satellite station; the device comprises:
the data generation module is used for generating a first data frame corresponding to the first user data according to a fixed frame format if the first user data exists in a preset period; the data length corresponding to the fixed frame format is fixed;
the data sending module is used for sending the first data frame to the satellite station at a data sending time node reached in the preset period, so that the satellite station can superimpose the first data frame and a reference data frame to obtain a first mixed data frame, and the first mixed data frame is respectively returned to the home terminal base station and the opposite terminal base station;
the reference data frame is sent to the satellite station by the data sending time node reached by the opposite terminal base station in the preset period, and the reference data frame is obtained by processing second user data or an opposite terminal blank data sequence by the opposite terminal base station according to the fixed frame format;
And the data analysis module is used for taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain the second user data or the opposite terminal null data sequence.
In a third aspect, the present invention provides a base station comprising: a memory storing machine-readable instructions executable by the processor, the processor executing the machine-readable instructions when the base station is running to implement the data frame processing method of any of the embodiments described above.
In a fourth aspect, the present invention provides a carrier superposition system, including a satellite station, an opposite end base station, and a local end base station provided in the third aspect, where the local end base station is communicatively connected to the opposite end base station through the satellite station.
In a fifth aspect, the present invention provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the data frame processing method according to any one of the embodiments described above.
Compared with the prior art, the embodiment of the invention provides a data frame processing method, a device, a local base station, a system and a storage medium, wherein in a carrier superposition system comprising the local base station, a satellite station and an opposite base station, for the local base station: if the first user data exists in the preset period, the data transmission time node reached in the preset period transmits a first data frame generated according to a fixed frame format to the satellite station, so that the satellite station respectively returns a first mixed data frame obtained by superposing the first data frame and a reference data frame to the local base station and the opposite terminal base station, the reference data frame is transmitted to the satellite station by the opposite terminal base station at the data transmission time node, and the reference data frame is obtained by processing second user data or an opposite terminal null data sequence by the opposite terminal base station according to the fixed frame format; and taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain second user data or a peer-to-peer null data sequence. Compared with the prior art, the beneficial effect of this scheme lies in: the data length corresponding to the fixed frame format is fixed, and the two base stations acquire the data frames transmitted by the data transmission time node according to the fixed frame format, so that the throughput of data transmission in the system is improved, and the real-time performance of the system is also improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a carrier superposition system.
Fig. 2 is a flow chart of a data frame processing method according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a relationship between a preset period and a data transmission time node according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a fixed frame format according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a processing flow of first user data according to an embodiment of the present invention.
Fig. 6 is a second flowchart of a data frame processing method according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a scenario for generating a local null data sequence according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a processing flow of a local null data sequence according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a data frame processing apparatus according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a home base station according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Here, the description will be given of the relevant belongings or the ranking related to the present scheme.
(1) The RM code, known as Reed-muller code, is a channel coding scheme.
(2) Four modulation modes:
1) BPSK, full scale Binary PhaseShift Keying, binary phase shift keying.
2) QPSK, full name QuadraturePhase Shift Keying, quadrature phase shift keying.
3) PSK, under the name Phase ShiftKeying, phase shift keying.
4) QAM, full scale QuadratureAmplitude Modulation, quadrature amplitude modulation.
Referring to fig. 1, fig. 1 is a schematic diagram of a carrier superposition system 100. The carrier superposition system 100 includes a home base station 110, a satellite station 120, and an opposite base station 130, where the home base station 110 and the opposite base station 130 are communicatively connected through the satellite station 120.
The satellite station 120 may be a satellite earth, for transparent forwarding of received signals. The home base station 110 and the peer base station 130 are each a ground station device, which may be, but is not limited to: portable ground station devices (e.g., satellite phones), stationary ground station devices, removable ground station devices (carrier-based station devices, on-board station devices, and on-board station devices), and the like.
In the carrier superposition system 100, the uplink frequency and the downlink frequency which are completely the same are used between the base station 110 at the home terminal and the base station 130 at the opposite terminal and the satellite station 120, so that half of frequency band resources can be saved, and the utilization efficiency of the frequency band is obviously improved.
Referring to fig. 1, in the carrier superposition system 100, both the base station 110 and the opposite base station 130 receive the same downlink signal s1+s2. The downlink signal s1+s2 is obtained by superimposing the uplink signal S1 and the uplink signal S2 transmitted by the home base station 110 and the opposite base station 130 by the satellite station 120.
The signal transmitted by the other party is called a useful signal, and the signal transmitted by the own party is called an interference signal. The two uplink signals are transmitted in the same frequency and channel at the same time, and the sending and receiving time is not limited by tasks. Although each base station receives the mixed signal, as the uplink signal sequence sample of the interference signal exists locally, the interference signal in the mixed signal can be reconstructed only by accurately estimating the parameters (timing deviation, amplitude, frequency and initial phase) of the channel, and thus, the useful signal is separated by using an interference cancellation or positive blind source separation method, and normal communication is realized.
Both base stations need to transmit uplink signals to the satellite station 120 at regular time, and the satellite station 120 returns the mixed signals after the superposition of the two uplink signals to both base stations through two downlink links with the same frequency. For the base station 110, if there is user data to be sent, the uplink signal S1 includes the user data; if there is no user data to be transmitted, the uplink signal S1 contains a null data sequence. Likewise, for the base station 130, the uplink signal S2 contains either user data or null data sequences.
When the uplink signal S1 and the uplink signal S2 both include null data sequences, it is necessary to ensure that the two null data sequences do not overlap so that the own data (the null data sequence of the own) and the counterpart data (the null data sequence of the counterpart) cannot be recognized from the mixed signal (i.e., the downlink signal s1+s2).
In the prior art, in order to avoid that the null data sequences generated by the two base stations are not repeated, the home base station 110 and the opposite base station 130 need to negotiate different scrambling codes corresponding to each other, and the null data sequences generated by the two base stations by using the scrambling codes are not repeated. However, the process of negotiating the scrambling code is very cumbersome, time consuming and laborious.
In view of this, the embodiment of the present invention provides a data frame processing method, which uses a fixed frame format with a fixed data length, and both base stations obtain data frames sent by a data sending time node according to the fixed frame format, so that the throughput of data transmission is improved. Meanwhile, the local end base station generates the local end null data sequence by utilizing the hardware address of the local end null data sequence, and the repetition of the opposite end null data sequence generated by the opposite end base station can be avoided. The following detailed description is made by way of example with reference to the accompanying drawings.
Referring to fig. 1, in this scheme, a home base station and an opposite base station respectively obtain an uplink signal S1 and an uplink signal S2, and logic for processing a mixed signal is consistent, and a data frame processing method in this scheme is mainly described below by using the home base station.
Referring to fig. 2, fig. 2 is a flow chart of a data frame processing method according to an embodiment of the present invention, an execution body of the method is a home base station of the carrier superposition system, and the method includes steps S110 to S130:
and S110, if the first user data exists in the preset period, generating a first data frame corresponding to the first user data according to a fixed frame format.
In this embodiment, the first user data is data that needs to be sent by the base station, where the base station needs to send an uplink signal once every a preset period, and if the first user data exists in one preset period, the uplink signal is a first data frame including the first user data.
It will be appreciated that the data length corresponding to the fixed frame format is fixed, and that the frame length of the first data frame obtained from the first user data of different sizes is also fixed.
And S120, the first data frame is sent to the satellite station at the data sending time node reached in the preset period, so that the satellite station overlaps the first data frame and the reference data frame to obtain a first mixed data frame, and the first mixed data frame is returned to the local base station and the opposite base station respectively.
It will be appreciated that the preset period and the data transmission time node are a relative concept, and for a preset period, the data transmission time node is the time when the preset period ends on the time axis. Referring to fig. 3, assuming that the preset period has a size of T, for three consecutive periods T1, T2, T3, the respective data transmission time nodes of T1, T2, T3 are T1, T2, T3, respectively. In the carrier superimposing system, however, the size of the preset period is set at a subtle level in general, so that the throughput of data in the system is enormous.
And the opposite base station also transmits a reference data frame to the satellite station at a data transmission time node which arrives at a preset period, and the reference data frame is obtained by processing second user data or an opposite null data sequence according to a fixed frame format by the opposite base station.
Therefore, the first mixed data frame contains either the user data (first user data and second user data) of each of the two base stations or the first user data of the base station and the opposite terminal null data sequence of the opposite base station.
S130, based on the first data frame, the reference data frame is taken out from the first mixed data frame, and the reference data frame is analyzed according to the fixed frame format, so as to obtain second user data or a peer-to-peer null data sequence.
It will be appreciated that the mixed signal, such as the first mixed data frame, belongs to a time-frequency overlapping signal. The method for separating the reference data frame from the first mixed data frame by the base station at the home terminal may be implemented by using the prior art or the improved prior art, and the specific implementation means is not repeated herein. For example: when the local base station and the opposite base station are in cooperative communication, samples (i.e. first data frames) of uplink signal sequences of interference signals are stored locally in the local base station, so that the local base station can adopt positive blind source separation or an interference cancellation algorithm based on signal reconstruction to eliminate the interference signals (i.e. first data frames) to a certain extent to obtain useful signals (i.e. reference data frames) so as to realize normal communication.
And for the opposite terminal base station, similarly, when the first mixed data frame is received, the first data frame can be taken out from the first mixed data frame based on the reference data frame, and the first data frame is analyzed according to the fixed frame format, so as to obtain the first user data.
In the data frame processing method provided by the embodiment of the invention, if first user data exists in a preset period, a local base station sends a first data frame generated according to a fixed frame format to a satellite station at a data sending time node, so that the satellite station respectively returns a first mixed data frame obtained by superposing the first data frame and a reference data frame to the local base station and an opposite terminal station, wherein the reference data frame is sent to the satellite station by the opposite terminal station at the data sending time node, and the reference data frame is obtained by the opposite terminal station according to the fixed frame format; and taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain second user data or a peer-to-peer null data sequence. According to the scheme, the data length corresponding to the fixed frame format is fixed, and the two base stations acquire the data frames transmitted by the data transmission time node according to the fixed frame format, so that the throughput of data transmission is improved.
The fixed frame format provided by the present scheme will be described first.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a fixed frame format according to an embodiment of the present invention. The fixed frame format may include three parts, namely a frame header, modulation parameters and payload data, the frame length of the fixed frame format being 2464 symbols, the frame header, modulation parameters and payload data occupying 32 symbols, 32 symbols and 2400 symbols, respectively.
Wherein the payload data consists of pilot data of 96 symbols and valid data of 2304 symbols. And, the pilot data consists of 96 pilot blocks, and the effective data consists of 97 data blocks.
In the load data in the fixed frame format, the rest data blocks occupy 24 symbols except that the first and the last data blocks occupy 12 symbols; 96 pilot blocks are evenly distributed among the data blocks (one pilot block exists between every two data blocks).
Because there are sometimes frequency deviations and phase deviations in time between the home base station and the opposite base station. Therefore, a plurality of pilot blocks are designed in a fixed frame format to achieve the purposes of time synchronization and frequency synchronization by capturing and tracking (removing frequency offset by using phase-locked loop tracking).
In this embodiment, a fixed frame format is adopted in the carrier superposition system, so that the transmitting end and the receiving end of the data simplify the flow of processing the local end base station and the opposite end base station to obtain the uplink signal, and also shorten the synchronization and demodulation time, or reduce the processing time delay, thereby being beneficial to improving the throughput of data transmission.
In an alternative embodiment, the first data frame is obtained from the first user data by scrambling, encoding, modulating, framing according to a fixed frame format, and the like. Correspondingly, the substeps of the step S110 may include S111 to S117.
S111, generating frame header and pilot frequency data, searching a preset modulation mapping table according to the size of the first user data, and determining modulation and demodulation parameters.
In this embodiment, the frame header may be 00001001011001111100011011101010, which is a 32-bit PN sequence, for a total of 32 bits. The pilot data may be all 0 s, and may be used directly for subsequent framing without modulation, or may be considered as being capable of performing zero padding processing on each pilot block field directly during subsequent framing.
It will be appreciated that the modem parameters may be used to reflect the manner in which the first user data is modulated. The modulation mapping table may include a modulation and demodulation scheme used to map the first user data of different sizes to a fixed frame length. In an alternative example, the modulation mapping table may be as shown in table (1) below:
Watch (1)
The modem parameter is also called a mod parameter, which is represented by 4 bits, and the range that can be represented is 0 to 15. The validity information may represent the size of the user data, for example: assuming that the first user data is 1536 bits, that is, 768 bit pairs, the modulation and demodulation parameter corresponding to the first user data should be 1, and converted into binary system, that is, 0001, which is only an example and not limited thereto.
S112, performing RM coding processing on the modulation and demodulation parameters to obtain RM coded data.
With reference to fig. 5, after determining the adjustment demodulation parameter corresponding to the first user data, the adjustment demodulation parameter may be encoded with an RM code, to obtain an encoded codeword, that is, RM encoded data.
S113, scrambling and check value adding processing are carried out on the first user data, and the processed user data are obtained.
S114, coding the processed user data to obtain coded data.
Referring to fig. 5, for the first user data, scrambling is performed first, then CRC (CyclicRedundancy Check ) 16 check is performed on the whole scrambled bit data frame to obtain a 16-bit CRC16 check value, and then the CRC16 check value is added to the tail of the whole scrambled bit data frame to obtain the processed user data.
And then the processed user data is coded to obtain code words, namely coded data. Here, the encoding process may include Turbo encoding, interleaving, puncturing, and the like, and the scrambling process, the verification process, and the encoding process may all be implemented by using the prior art, and specific implementation means are not repeated herein.
S115, respectively modulating the frame header and the RM coded data, and modulating the coded data based on the modulation and demodulation mode to obtain the modulated frame header, RM coded data and coded data.
In the present embodiment, BPSK modulation is employed for the frame header.
The RM-encoded data obtained by RM-encoding the modem parameters can be expressed as
BPSK modulation may be used for RM encoded data, with the modulation formula as follows: />
Wherein->
Is->
Modulated signal of>
Represents->
Middle->
The modulated RM encoded data occupies 32 symbols.
For the coded data corresponding to the first user data, modulation is performed by adopting a modulation and demodulation mode corresponding to the modulation and demodulation parameters, and the modulated coded data occupies 2304 symbols. For example, assuming that the modulation mapping table is searched for to determine that the modulation and demodulation parameter is 6 according to the size of the first user data, it can be determined that the corresponding modulation and demodulation mode adopts 8PSK modulation and the code rate is 2/3, which is only an example and is not limited herein.
S116, according to the fixed frame format, assembling pilot frequency data, a modulated frame header, RM coded data and coded data to obtain a first initial data frame.
It can be understood that after framing is completed, a first initial data frame is obtained, where the first initial data frame is composed of a modulated frame header, modulated RM encoded data and load data, and the modulated RM encoded data represents a modem parameter corresponding to the first user data.
The payload data may include a number of data blocks and a number of pilot blocks, one pilot block between each two data blocks. The data blocks may be partitioned from the modulated encoded data and the pilot blocks may be partitioned from the pilot data.
S117, scrambling the first initial data frame to obtain a first data frame.
In this embodiment, scrambling may be performed on the payload data portion in the first initial data frame, to obtain a final first data frame. The scrambling process may be implemented by using the prior art, and specific implementation means are not described herein.
In an alternative embodiment, if the first user data does not exist in a preset period, the base station needs to generate a local null data sequence at a data sending time node of the preset period, and processes the local null data sequence to obtain an uplink signal to be sent corresponding to the preset period. Correspondingly, referring to fig. 6, the data frame processing method may further include steps S140 to S170.
And S140, if the first user data does not exist in the preset period, generating a local null data sequence by the data transmission time node reached in the preset period by utilizing the hardware address of the data transmission time node and the preset fixed sequence value.
It can be understood that if there is no first user data in the preset period, then there is no first data frame to be transmitted in the data transmission time node, and then a local null data sequence needs to be generated at this time to generate an uplink signal to be transmitted at this time.
In this embodiment, the hardware address may be a hardware ID of the core processor in the base station, where the hardware ID is a factory number of the device, and is not repeated. For the end base station, if the end base station does not have the second user data to be transmitted in the preset period, the end null data sequence is also generated based on the hardware address of the end base station and the preset fixed sequence value. Because the hardware addresses of the home terminal base station and the opposite terminal base station are not repeated, the home terminal null data sequence is not repeated with the opposite terminal null data sequence of the opposite terminal base station.
Therefore, in the scheme, the two parties generate the null data sequence by utilizing the respective hardware addresses to avoid repetition, and the complicated scrambling negotiation process which is performed in advance for obtaining the null data sequence without repetition in the prior art is avoided.
S150, generating a second data frame corresponding to the local null data sequence according to the fixed frame format.
In the present embodiment, each data block of the payload data portion in the second data frame is obtained from the port data sequence, unlike the first data frame described above.
And S160, sending the second data frame to the satellite station so that the satellite station can superimpose the second data frame and the reference data frame to obtain a second mixed data frame, and respectively returning the second mixed data frame to the local base station and the opposite base station.
For the home base station, after sending the second data frame to the satellite station, the second hybrid data frame returned by the satellite station can be waited. The second mixed data frame contains either the null data sequences (the home null data sequence and the opposite null data sequence) of the two base stations or the home null data sequence of the home base station and the second user data of the opposite base station.
S170, based on the second data frame, the reference data frame is taken out from the second mixed data frame, and the reference data frame is analyzed according to the fixed frame format, so as to obtain second user data or a peer-to-peer null data sequence.
Likewise, the second mixed data frame also belongs to the time-frequency overlapping signal, and the manner of separating the reference data frame from the second mixed data frame is similar to the process of the first mixed data frame, and is not described herein.
It should be noted that, the steps S110 to S130 and the steps S140 to S170 are represented by two parallel modes. Therefore, in the same preset period, the local base station performs either steps S110 to S130 or steps S140 to S170.
In an alternative embodiment, two primitive polynomials may be used to generate the local port data sequence, and correspondingly, in the step S140, the process of generating the local null data sequence by using the hardware address of the local null data sequence and a preset fixed sequence value may include the following substeps S141 to S143.
S141, taking the hardware address as an initial value of a first primitive polynomial to obtain a first random sequence.
S142, taking the fixed sequence value as an initial value of a second primitive polynomial to obtain a second random sequence.
In an alternative example, the first primitive polynomial may be employed
The second primitive polynomial may be +.>
。/>
Typically, the hardware address is 48 bits, and the addition of 0 at the tail of the hardware address can map 48 bits to 49 bits as the initial value of the first primitive polynomial, which can be expressed as:
together 49 bits.
The initial value of the second primitive polynomial is a predetermined fixed sequence value, and the fixed sequence value is a set of binary random numbers, for example, the fixed sequence value may be:
1100011101100101011000100110010101011011100111010, which can be expressed as:
s143, performing exclusive OR operation on the first random sequence and the second random sequence to obtain the local terminal null data sequence.
The process of obtaining the home null data sequence will be briefly described with reference to fig. 7.
In fig. 7, # -indicates exclusive or, and D indicates a shift register. Each shift register may hold 1 bit.
For the first primitive polynomial
First initial value of 49 bits (+)>
) Respectively stored in 49 shift registers of the first register unit.
For the second primitive polynomial
Second initial value of 49 bits (++>
) Also stored in 49 shift registers of the second register unit, respectively.
Under control of the clock signal, the two register units are shifted. For example, the data in each shift register will shift right once on each rising edge of the clock signal, at the first
At the time of the secondary shift, the following two cases occur:
1. first register unitThe data in each shift register in the first register unit and the second register unit are shifted to the right to the next shift register, and at the moment, the rightmost shift register of the first register unit and the second register unit outputs a value respectively, and the two values are subjected to exclusive OR operation to obtain 
，/>
I.e. a certain value in the local null data sequence.
2. The first shift register at the leftmost side of the first register unit and the second register unit is free, and the filling modes of the first shift register and the second shift register are as follows:
(1) For the first register unit: after shifting, the value in the 29 th shift register and the value of the last shift register at the rightmost side are subjected to exclusive OR operation to obtain a value which can fill the first shift register which is emptied.
(2) For the second register unit: after shifting, the value obtained by exclusive OR operation of the value in the 44 th shift register, the value in the 33 rd shift register, the value in the 29 th shift register and the value of the last shift register at the rightmost side can fill the first shift register which is left out.
Thus go through
After the sub-shift, the first register unit will output +>
A first random sequence of bits, the second register unit outputting +.>
The second random sequence of the bits, the first random sequence and the second random sequence are exclusive-ored to obtain +.>
A local null data sequence of bits:
it should be noted that the foregoing examples are merely examples, and in practical applications, the primitive polynomial and the shift degree may be selected according to practical application conditions, and are not limited herein.
In an alternative embodiment, in combination with fig. 8, only encoding, modulation, framing according to a fixed frame format, etc. are required in the process of obtaining the second data frame from the home null data sequence, unlike the first user data. Correspondingly, the substeps of the step S150 may include S151 to S155.
S151, generating frame header and pilot frequency data, and determining preset modulation and demodulation parameters corresponding to a preset modulation and demodulation mode.
It is understood that the frame header and pilot data generated herein are the same as those in step S111, and will not be described here.
In this embodiment, for the local null data sequence, the above-mentioned modulation mapping table may be searched to determine that BPSK modulation is performed and the corresponding preset modulation-demodulation parameter is 0, and the corresponding preset modulation-demodulation mode is BPSK modulation.
S152, carrying out RM coding processing on the preset modulation-demodulation parameters to obtain preset RM coding data.
The process of encoding the preset modem parameter by using the RM code is consistent with the encoding manner of the modem parameter corresponding to the first user data in the step S110, which is not described herein.
And S153, respectively modulating the frame header and the preset RM coded data, and modulating the local terminal null data sequence based on a preset modulation and demodulation mode to obtain the modulated frame header, the preset RM coded data and the local terminal null data sequence.
In this embodiment, the modulation of the preset RM encoded data for the frame header can be referred to the related description of the sub-steps of step S110 described above. For the local null data sequence, a preset modulation-demodulation mode (i.e., BPSK modulation) is directly adopted.
And S154, according to the fixed frame format, assembling pilot frequency data, a modulated frame header, preset RM coding data and a local null data sequence to obtain a second initial data frame.
It can be understood that after framing is completed, a second initial data frame is obtained, where the second initial data frame is composed of a modulated frame header, modulated preset RM encoded data and load data, and the modulated preset RM encoded data represents preset modulation and demodulation parameters corresponding to the local null data sequence.
The payload data may include a number of data blocks and a number of pilot blocks, one pilot block between each two data blocks. The data blocks are obtained by dividing the modulated local terminal null data sequence, and the pilot frequency blocks are obtained by dividing pilot frequency data.
S155, scrambling the second initial data frame to obtain a second data frame.
In this embodiment, the scrambling may be performed on the payload data portion in the second initial data frame, to obtain a final second data frame. The scrambling process may also be implemented by using the prior art, and specific implementation means are not described herein.
It should be noted that, in the above method embodiment, the execution sequence of each step is not limited by the drawing, and the execution sequence of each step is based on the actual application situation.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
(1) And a fixed frame format is adopted, so that when two base stations in the carrier superposition system generate data frames or process received data frames, multiple frame structures do not need to be considered, and the processing flow is simplified. Meanwhile, in the fixed frame structure, the effective data is fixed to 2304 symbols, so that the frame length of the fixed frame structure is fixed, and the synchronization and demodulation time of the data frame can be shortened, namely, the processing time delay is reduced, and the throughput of data transmission is improved.
(2) The adoption of the fixed frame structure can be beneficial to simplifying the hardware implementation of the base station, simplifying the system flow design and reducing the consumption of hardware resources.
(3) Two base stations in the carrier superposition system generate null data sequences by utilizing respective hardware addresses, and a random null data sequence is adopted to fill null data frames (namely second data frames), so that the implementation is simple, and the conflict problem of the null data frames at two ends is effectively solved. And on the premise of avoiding repetition of the null data sequences of the base stations at the two ends, the complicated scrambling code negotiation process which is performed in advance in order to obtain the null data sequences which are not repeated in the prior art is avoided.
In order to perform the corresponding steps in the above-described method embodiments and in each possible implementation, an implementation of a data frame processing apparatus is given below.
Referring to fig. 9, fig. 9 is a schematic diagram illustrating a structure of a data frame processing apparatus according to an embodiment of the present invention. The data frame processing apparatus 200 is applied to a home base station of the carrier superposition system shown in fig. 1, and the data frame processing apparatus 200 includes: a data generation module 210, a data transmission module 220, and a data analysis module 230.
The data generating module 210 is configured to generate, in a preset period, a first data frame corresponding to first user data according to a fixed frame format if the first user data exists; the data length corresponding to the fixed frame format is fixed;
the data sending module 220 is configured to send the first data frame to the satellite station at a data sending time node reached in the preset period, so that the satellite station superimposes the first data frame and a reference data frame to obtain a first mixed data frame, and returns the first mixed data frame to the home base station and the opposite base station respectively; the reference data frame is sent to the satellite station by the data sending time node reached by the opposite terminal base station in the preset period, and the reference data frame is obtained by processing second user data or an opposite terminal blank data sequence by the opposite terminal base station according to the fixed frame format;
The data parsing module 230 is configured to extract the reference data frame from the first mixed data frame based on the first data frame, and parse the reference data frame according to the fixed frame format to obtain the second user data or the peer-to-peer null data sequence.
In an alternative embodiment, the fixed frame format includes a frame header, a modulation parameter, and payload data, where the payload data includes a plurality of data blocks and a plurality of pilot blocks, one pilot block exists between each two data blocks, and a data length of the payload data is fixed.
In an alternative embodiment, the data generating module 210 may specifically be configured to: generating frame header and pilot frequency data, searching a preset modulation mapping table according to the size of the first user data, and determining modulation and demodulation parameters; wherein, the modulation and demodulation parameter reflects the modulation and demodulation mode of the first user data; the modulation mapping table comprises a modulation and demodulation mode adopted by mapping first user data with different sizes to a fixed frame length; performing RM coding processing on the modulation-demodulation parameters to obtain RM coded data; scrambling and verifying value adding are carried out on the first user data, and processed user data are obtained; coding the processed user data to obtain coded data; modulating the frame header, the RM coded data and the pilot frequency data respectively, and modulating the coded data based on the modulation and demodulation mode to obtain modulated frame header, RM coded data, coded data and pilot frequency data; according to the fixed frame format, assembling the modulated frame header, RM coded data, coded data and pilot frequency data to obtain a first initial data frame; the first initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing modulated coded data, and the pilot blocks are obtained by dividing modulated pilot data; and scrambling the first initial data frame to obtain the first data frame.
In an optional embodiment, the data generating module 210 may be further configured to generate, in the preset period, a local null data sequence by using a hardware address of the data transmitting time node and a preset fixed sequence value if the first user data does not exist; generating a second data frame corresponding to the local null data sequence according to the fixed frame format;
the data sending module 220 may be further configured to send the second data frame to the satellite station, so that the satellite station superimposes the second data frame and the reference data frame to obtain a second mixed data frame, and returns the second mixed data frame to the home base station and the peer base station respectively;
the data parsing module 230 may be further configured to extract the reference data frame from the second mixed data frame based on the second data frame, and parse the reference data frame according to the fixed frame format to obtain the second user data or the peer-to-peer null data sequence.
In an alternative embodiment, the data generating module 210 may specifically be configured to: taking the hardware address as an initial value of a first primitive polynomial to obtain a first random sequence; taking the fixed sequence value as an initial value of a second primitive polynomial to obtain a second random sequence; and performing exclusive OR operation on the first random sequence and the second random sequence to obtain the local null data sequence.
In an alternative embodiment, the data generating module 210 may specifically be configured to: generating frame header and pilot frequency data, and determining preset modulation-demodulation parameters corresponding to a preset modulation-demodulation mode; performing RM coding processing on the preset modulation-demodulation parameters to obtain preset RM coding data; modulating the frame header, the preset RM coded data and the pilot frequency data respectively, and modulating the local terminal null data sequence based on the preset modulation and demodulation mode to obtain a modulated frame header, preset RM coded data, a local terminal null data sequence and pilot frequency data; according to the fixed frame format, assembling the modulated frame header, preset RM coding data, a local terminal null data sequence and pilot frequency data to obtain a second initial data frame; the second initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing the modulated local terminal null data sequence, and the pilot blocks are obtained by dividing the modulated pilot data; and scrambling the second initial data frame to obtain the second data frame.
It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the data frame processing apparatus 200 described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated here.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a home base station according to an embodiment of the present invention. The base station 110 includes a processor 111, a memory 112, and a bus 113, and the processor 111 is connected to the memory 112 through the bus 113.
The processor 111 may be an integrated circuit chip with signal processing capabilities. The processor 111 may be a general-purpose processor including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (DigitalSignal Processing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
It will be appreciated that the structure shown in fig. 10 is merely illustrative, and that the home base station 110 may also include more or fewer components than shown in fig. 10, or have a different configuration than shown in fig. 10. The components shown in fig. 10 may be implemented in hardware, software, or a combination thereof.
The embodiment of the invention also provides a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the data frame processing method disclosed in the above embodiment is realized. The readable storage medium may be, but is not limited to: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, RAM, PROM, EPROM, EEPROM, FLASH magnetic disk or an optical disk.
In summary, the embodiments of the present invention provide a data frame processing method, apparatus, home base station, system, and storage medium, where in a carrier superposition system including a home base station, a satellite station, and a peer base station, for the home base station: if the first user data exists in the preset period, the data transmission time node reached in the preset period transmits a first data frame generated according to a fixed frame format to the satellite station, so that the satellite station respectively returns a first mixed data frame obtained by superposing the first data frame and a reference data frame to the local base station and the opposite terminal base station, the reference data frame is transmitted to the satellite station by the opposite terminal base station at the data transmission time node, and the reference data frame is obtained by processing second user data or an opposite terminal null data sequence by the opposite terminal base station according to the fixed frame format; and taking out the reference data frame from the first mixed data frame based on the first data frame, and analyzing the reference data frame according to the fixed frame format to obtain second user data or a peer-to-peer null data sequence. Compared with the prior art, the beneficial effect of this scheme lies in: the data length corresponding to the fixed frame format is fixed, and the two base stations acquire the data frames transmitted by the data transmission time node according to the fixed frame format, so that the throughput of data transmission in the system is improved, and the real-time performance of the system is also improved.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The data frame processing method is characterized by being applied to a local base station of a carrier superposition system, wherein the carrier superposition system also comprises a satellite station and an opposite base station, and the local base station and the opposite base station are in communication connection through the satellite station; the method comprises the following steps:
if first user data exists in a preset period, generating a first data frame corresponding to the first user data according to a fixed frame format; the data length corresponding to the fixed frame format is fixed;
the first data frame is sent to the satellite station at a data sending time node reached in the preset period, so that the satellite station overlaps the first data frame and a reference data frame to obtain a first mixed data frame, and the first mixed data frame is returned to the home terminal base station and the opposite terminal base station respectively;
The reference data frame is sent to the satellite station by the data sending time node reached by the opposite terminal base station in the preset period, and the reference data frame is obtained by processing second user data or an opposite terminal blank data sequence by the opposite terminal base station according to the fixed frame format;
the reference data frame is taken out from the first mixed data frame based on the first data frame, and the reference data frame is analyzed according to the fixed frame format, so that the second user data or the opposite terminal null data sequence is obtained;
if the first user data does not exist in the preset period, generating a local terminal null data sequence by using a hardware address of the node and a preset fixed sequence value at the data transmission time node;
generating a second data frame corresponding to the local null data sequence according to the fixed frame format;
sending the second data frame to the satellite station, so that the satellite station overlaps the second data frame and the reference data frame to obtain a second mixed data frame, and respectively returns the second mixed data frame to the local terminal base station and the opposite terminal base station;
And taking out the reference data frame from the second mixed data frame based on the second data frame, and analyzing the reference data frame according to the fixed frame format to obtain the second user data or the opposite terminal null data sequence.
2. The method according to claim 1, wherein the step of generating the local null data sequence by using the hardware address of the local null data sequence and a preset fixed sequence value includes:
taking the hardware address as an initial value of a first primitive polynomial to obtain a first random sequence;
taking the fixed sequence value as an initial value of a second primitive polynomial to obtain a second random sequence;
and performing exclusive OR operation on the first random sequence and the second random sequence to obtain the local null data sequence.
3. The method of claim 1, wherein the step of generating the second data frame corresponding to the home null data sequence in the fixed frame format comprises:
generating frame header and pilot frequency data, and determining preset modulation-demodulation parameters corresponding to a preset modulation-demodulation mode;
performing RM coding processing on the preset modulation-demodulation parameters to obtain preset RM coding data;
Modulating the frame header and the preset RM coded data respectively, and modulating the local terminal null data sequence based on the preset modulation and demodulation mode to obtain a modulated frame header, preset RM coded data and a local terminal null data sequence;
according to the fixed frame format, assembling the pilot frequency data, the modulated frame header, preset RM coding data and a local terminal null data sequence to obtain a second initial data frame; the second initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing the modulated local terminal null data sequence, and the pilot frequency blocks are obtained by dividing the pilot frequency data;
and scrambling the second initial data frame to obtain the second data frame.
4. The method of claim 1, wherein the step of generating the first data frame corresponding to the first user data in a fixed frame format comprises:
generating frame header and pilot frequency data, searching a preset modulation mapping table according to the size of the first user data, and determining modulation and demodulation parameters; wherein, the modulation and demodulation parameter reflects the modulation and demodulation mode of the first user data; the modulation mapping table comprises a modulation and demodulation mode adopted by mapping first user data with different sizes to a fixed frame length;
Performing RM coding processing on the modulation-demodulation parameters to obtain RM coded data;
scrambling and verifying value adding are carried out on the first user data, and processed user data are obtained;
coding the processed user data to obtain coded data;
modulating the frame header and the RM coded data respectively, and modulating the coded data based on the modulation and demodulation mode to obtain modulated frame header, RM coded data and coded data;
according to the fixed frame format, assembling the pilot frequency data, the modulated frame header, RM coded data and coded data to obtain a first initial data frame; the first initial data frame comprises a plurality of data blocks and a plurality of pilot blocks, and one pilot block exists between every two data blocks; the data blocks are obtained by dividing modulated coded data, and the pilot frequency blocks are obtained by dividing pilot frequency data;
and scrambling the first initial data frame to obtain the first data frame.
5. The method of claim 1, wherein the fixed frame format comprises a frame header, modulation parameters, and payload data, the payload data comprising a number of data blocks and a number of pilot blocks, one of the pilot blocks being present between each two of the data blocks, the payload data having a fixed data length.
6. The data frame processing device is characterized by being applied to a local base station of a carrier superposition system, wherein the carrier superposition system also comprises a satellite station and an opposite base station, and the local base station and the opposite base station are in communication connection through the satellite station; the device comprises a data generation module, a data transmission module and a data analysis module:
the data generation module is used for generating a first data frame corresponding to the first user data according to a fixed frame format if the first user data exists in a preset period; the data length corresponding to the fixed frame format is fixed;
the data sending module is configured to send the first data frame to the satellite station at a data sending time node reached in the preset period, so that the satellite station superimposes the first data frame and a reference data frame to obtain a first mixed data frame, and returns the first mixed data frame to the home base station and the opposite base station respectively;
the reference data frame is sent to the satellite station by the data sending time node reached by the opposite terminal base station in the preset period, and the reference data frame is obtained by processing second user data or an opposite terminal blank data sequence by the opposite terminal base station according to the fixed frame format;
The data analysis module is configured to extract the reference data frame from the first mixed data frame based on the first data frame, and analyze the reference data frame according to the fixed frame format to obtain the second user data or the peer-to-peer null data sequence;
the data generating module is further configured to generate a local null data sequence at the data sending time node by using a hardware address of the data generating module and a preset fixed sequence value if the first user data does not exist in the preset period; generating a second data frame corresponding to the local null data sequence according to the fixed frame format;
the data sending module is further configured to send the second data frame to the satellite station, so that the satellite station superimposes the second data frame and the reference data frame to obtain a second mixed data frame, and returns the second mixed data frame to the home base station and the opposite base station respectively;
the data analysis module is further configured to extract the reference data frame from the second hybrid data frame based on the second data frame, and analyze the reference data frame according to the fixed frame format, so as to obtain the second user data or the peer-to-peer null data sequence.
7. A home base station, comprising: a memory storing machine-readable instructions executable by the processor, the processor executing the machine-readable instructions when the home base station is running to implement the data frame processing method of any one of claims 1-5.
8. A carrier superposition system, comprising a satellite station, an opposite base station, and the home base station of claim 7, wherein the home base station is communicatively coupled to the opposite base station via the satellite station.
9. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the data frame processing method of any of claims 1-5.
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