CN117615458A - Multi-bandwidth frequency sweeping method of 5G ad hoc network system - Google Patents
Multi-bandwidth frequency sweeping method of 5G ad hoc network system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0457—Variable allocation of band or rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a multi-bandwidth frequency sweep method of a 5G ad hoc network system, which belongs to the technical field of 5G communication and is used for analyzing the influence of interference signals outside NR useful time slots on a main signal and whether received signals and transmitted signals of ad hoc network time slots accord with expectations. Firstly, distinguishing whether NR time slots are contained or not, and if NR time slots are contained, carrying out frequency sweep on special time slot S time slots; if the time slot is the full-automatic networking time slot, the frequency sweep is carried out at symbol6 of the time slot 0. The method comprises the steps of providing a sweep frequency time as a symbol length, taking 4096 data, storing the data into a memory ram, simultaneously storing the data corresponding to the address into a file with a bin file format according to a mode of reading a register address by software, storing the data into the file with the bin file format according to a mode of high-order data I and low-order data Q, and reporting the data to a baseband processing unit BBU through a common public radio interface CPRI for data analysis.
Description
Technical Field
The invention relates to a 5G ad hoc network communication system, which is used for analyzing the influence of interference signals outside NR useful time slots on a main signal and whether the received and transmitted signals of the ad hoc network time slots meet expectations.
Background
In a 5G ad hoc network communication system, because the system introduces ad hoc network time slots based on the original NR time slots, the complexity of the system becomes high, and meanwhile, the analysis means for interference signals is insufficient, so that the problem solving speed is slow. Furthermore, in the full ad hoc network mode, since two sets of devices are required to transmit and receive data to and from each other, when communication fails, problems cannot be solved due to the inability to locate the devices, and efficiency is reduced. It is necessary to perform analysis of interference signals in the non-useful time slots of NR and signal verification in the ad hoc network time slots.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a multi-bandwidth sweep method of a 5G ad hoc network system. The method is used for analyzing the influence of interference signals outside NR useful time slots on a main signal and whether the received and transmitted signals of the ad hoc network time slots meet expectations.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: firstly, whether a regional subframe proportion contains an NR time slot or not, and if so, completing frequency sweep in a special S time slot; if the time slot is the full-automatic networking time slot, the frequency sweep is carried out at slot0 symbol 6. The method comprises the following steps of:
step one, in a time division multiplexing TDD mode, identifying whether an NR time slot is contained in a subframe proportion; if yes, entering a second step, and if not, entering a seventh step;
step two, a sweep enabling switch is turned on, and a rising edge signal for starting sweep is set at the initial position of the first complete 10ms NR wireless frame head after the sweep enabling switch is turned on;
step three, after capturing a rising edge signal of the beginning of sweep frequency, driving an analog gating switch to a channel with corresponding bandwidth, driving a digital control oscillator NCO of an analog part to a corresponding frequency offset channel, and simultaneously selecting a digital channel filter to a channel with corresponding bandwidth;
step four, configuring a gap time slot in the s time slots into an uplink time slot, and simultaneously freeing a downlink time slot and an uplink time slot by 2us;
and fifthly, opening a sweep frequency operation switch at the initial position of the uplink time slot, and closing the sweep frequency operation switch at the position of the interval 34 us. Simultaneously recovering NCO, recovering an analog gating switch and recovering a digital filter;
step six, writing the swept data into a memory ram, reading the swept data by software, storing the swept data into a bin file, and reporting the data to a BBU through CPRI;
step seven, in the TDD mode, identifying whether all subframes in the subframe proportion are self-networking time slots, and if so, opening a sweep enabling switch;
step eight, at the initial position of the first 10ms NR wireless frame head after the sweep enabling switch is opened, 5 symbol length positions are separated, the analog gating switch is switched to a channel with corresponding bandwidth, NCO of the analog part is switched to a corresponding frequency offset position, and a digital channel filter is also selected to the corresponding bandwidth;
step nine, setting a sweep frequency running switch at the initial position of a sixth symbol, closing the sweep frequency switch at the position of a gap 34us, recovering NCO, recovering an analog gating switch, and recovering a digital filter;
and step ten, storing the swept data into ram, reading the data by software, storing the data into a bin file, and reporting the data to the BBU through CPRI.
The first step is specifically as follows: in a 5G ad hoc network system, the TDD modes currently supported are a TDD mode of full NR time slots, a combined TDD mode of NR time slots plus ad hoc network time slots, and a TDD mode of full ad hoc network time slots. And in a TDD mode comprising NR time slots, carrying out frequency sweep in S time slots of the NR time slots, and in a mode of full-self-networking time slots, carrying out frequency sweep in the first slot of a 10ms NR radio frame.
The second step is specifically as follows: under the full NR time slot or NR and Ad hoc network time slot, a sweep enabling switch is opened, and the sweep enabling switch is in sequence in time relative to the frame head of a 10ms NR wireless frame at the time node of opening, so that the following situations exist:
(1) the time node at which the sweep enable switch is on is in an advanced position relative to the 10msNR radio frame header, or just at the same time node. At this time, after the sweep enabling switch is turned on, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node at which the sweep enable switch is on is in a hysteresis position relative to the 10msNR wireless frame header. At this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
The third step is specifically as follows: after the sweep enabling switch is turned on, the starting position of the first complete 10ms NR wireless frame head is used as a rising edge signal for starting sweep operation. And because the system supports multi-bandwidth signal models, including bandwidths of 5Mhz,10Mhz,20Mhz,40Mhz,60Mhz and 100 Mhz. The analog and digital parts are required and the associated modules that process the baseband signal are set to the corresponding bandwidths of the required frequency sweeps. For the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter. For example, in a default state, the digital filter is 100Mhz, the NCO of the analog part has no frequency offset, the cavity filter is 100Mhz, at this time, the sweep is required to be performed in a mode with a bandwidth of 5Mhz, at this time, the initial position of the first 10ms nr radio frame after the sweep is enabled to be opened is required to adjust the cavity filters of the digital part and the analog part to a bandwidth channel of 5Mhz, the switching of the channels of the digital filter and the cavity filter is controlled by a register, and the NCO is not required to be adjusted at this time.
The fourth step is specifically as follows: in 5G and ad hoc network time slots, since interference except useful time slots needs to be analyzed in the time domain, actual service conditions which do not affect NR of the user need to be considered, the sweep operation is performed only in S time slots of the NR time slots. Since the time slots outside the useful time slots are theoretically full of the transceiving data of the service, the guard interval GAP in the S time slots needs to be set as the uplink time slot U, and in order to prevent the collision between the uplink and downlink data links caused by the removal of the guard interval, the space between the downlink time slot and the uplink time slot is set to be 2us, and the rest of the set U time slots are used as the sweep time slots.
The fifth step is specifically as follows: in step four, at the starting position of the modified uplink timeslot, that is, at a position 2us away from the starting position of the original GAP timeslot, the sweep operation switch is turned on, the sweep operation switch is turned off at a position spaced by 34us, 4096 data are read in the time when the sweep operation switch is turned on, and the accurate time for the sweep operation switch to last is 8.138ns by 4096=33.33 us, taking a clock of 122.88Mhz as an example, and the unit time is 8.138 ns. And when the sweep operation switch is closed, the digital filter and the cavity filter of the analog part are restored to a default state before the sweep operation is executed, and the condition is that the sweep operation is completed.
The sixth step is specifically as follows: and writing the data read by the sweep frequency operation into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the data output of the ram to a BBU through CPRI for data analysis.
The seventh step is specifically as follows: under the time slot of the full ad hoc network, a sweep enabling switch is turned on, and the sweep enabling switch is in sequence in time relative to the frame head of a 10msNR wireless frame at the time node of being turned on, so that the following situations exist:
(1) the time node at which the sweep enable switch is on is in an advanced position relative to the 10msNR radio frame header, or just at the same time node. At this time, after the sweep enabling switch, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node at which the sweep enable switch is on is in a hysteresis position relative to the 10msNR wireless frame header. At this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
The method comprises the following steps: in the TDD mode of the full-automatic networking time slot, the method is agreed to send verification information at the slot0 symbol6 position, and after capturing data through frequency sweep, the time delay of the signal is verified, and whether the quality of the signal accords with expectations or not is judged. The starting position of the first complete 10ms NR wireless frame head after the sweep enabling switch is opened is 5 symbol long, and the starting position of the sixth symbol is used as a rising edge signal for starting sweep operation. And because the system supports multi-bandwidth signal models, including bandwidths of 5Mhz,10Mhz,20Mhz,40Mhz,60Mhz and 100 Mhz. The analog and digital parts are required and the associated modules that process the baseband signal are set to the corresponding bandwidths of the required frequency sweeps. For the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter. For example, in a default state, the digital filter is 100Mhz, the NCO of the analog part has no frequency offset, the cavity filter is 100Mhz, when the sweep is required in the mode of 5Mhz bandwidth, then the initial position of the 6 th symbol of the first complete 10ms nr wireless frame after the sweep is enabled to be opened is required, the cavity filters of the digital part and the analog part are both adjusted to the bandwidth of 5Mhz, the switching of the digital filter and the cavity filter is controlled by a register, and the NCO does not need to be adjusted at this time.
The step nine specifically comprises the following steps: in step eight, at the start position of the 6 th symbol of the first complete 10ms nr radio frame after the turn-on of the sweep enable, the sweep operation switch is turned on, and at the position of the interval 34us, the sweep operation switch is turned off, where the duration of the sweep operation switch is equal to the time of writing 4096 data, and, taking a clock of 122.88Mhz as an example, the unit time is 8.138ns, and the accurate duration of the sweep operation is 8.138ns×4096=33.33 us. And when the sweep operation switch is closed, the digital filter and the cavity filter of the analog part are restored to a default state before the sweep operation is executed, and the condition is that the sweep operation is completed.
The method comprises the following steps: and writing the read data of the sweep frequency into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the output of the ram to a BBU through CPRI for data analysis.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the 5G time slot and the self-organizing network time slot under different TDD modes, and completes the sweep frequency function under S time slot under the TDD mode containing 5G time slot; under the time slot of the full self-organizing network, the frequency sweep function is completed at the first time slot of the 10msNR wireless frame, and the system stability is enhanced for the convention of the frequency sweep time slot;
2. in the invention, when the frequency sweep is carried out for NR time slots, the protection interval GAP in S time slots is configured into U time slots, and the first U time slot in S time slots carries out frequency sweep, thereby saving time domain resources, completing acquisition of interference signals and not affecting the service rate of the original NR;
3. when the method is used for scanning the time slot of the full-automatic networking, the stability of the self-networking signal verification is ensured by scanning the time slot in the first time slot of the 10msNR wireless frame, and the fixation of the self-networking time slot of the frequency scanning is provided for the receiving end and the transmitting end, so that great convenience is provided for the signal verification;
4. when the frequency sweep is carried out, the channel switches of the analog part NCO, the cavity filter and the digital filter are adjusted to corresponding bandwidths, and meanwhile, after the frequency sweep is finished, the switches are restored to a default state before the frequency sweep, so that the system functions are kept consistent before and after the frequency sweep function is executed;
5. according to the invention, the data captured by the sweep frequency is stored in the bin file in a mode of reading the data corresponding to the register address by software, so that analysis of a remote unit RRU side is facilitated, the data captured by the sweep frequency is reported to a baseband processing unit BBU by CPRI, analysis of the BBU side is facilitated, and dual verification ensures authenticity of an analysis interference signal under a 5G time slot and a verification signal under an ad hoc network time slot.
Drawings
Fig. 1 is a diagram of an interface of a multi-bandwidth sweep method of the present invention.
Fig. 2 is a flow chart of the multi-bandwidth sweep method of the present invention.
Fig. 3 is a timing diagram of a multi-bandwidth sweep method of the present invention.
Detailed Description
The technical solutions in 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. It will be apparent that the described embodiments are only some, but not all, 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.
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the interface of the present invention is as follows:
input: the clock signal frequency and the reset signal frequency are 122.88MHz. i_trig_10ms_nr is the rising edge pulse of the 1bit 10msNR radio frame header. i_scan_en is a 1bit register controlled sweep enable signal. i_reg_analog_nco is a 1bit register signal that controls the NCO of the analog domain. i_reg_analog_filter is a 1bit strobe register signal that controls the analog domain. i_reg_ch_filter is a 3bit register signal that selects a channel filter of the digital domain. i_cfg_nr is a 1bit signal indicating nr upstream and downstream slots. i_cfg_ zzw is a 1bit signal indicating an ad hoc network slot. i_cfg_s is a signal of 1bit indicating a special slot. i_jitter_nr is a 1-bit signal for determining whether or not an NR slot is included, and i_data_i, i_data_q are IQ data having a sampling rate of 122.88Mhz.
And (3) outputting: a_sw_rx, a_sw_nco is a 1bit signal that controls, respectively, the analog domain gating switch and the analog domain NCO pins. o_data_i and o_data_q are output data IQ having a sampling rate of 122.88M.
Referring to fig. 2 and 3, the present invention includes the steps of:
a multi-bandwidth sweep method of 5G ad hoc network system includes that firstly, whether a sub-frame ratio contains NR time slots or not is distinguished, if so, sweep is completed in a special time slot S; if the time slot is the full-automatic networking time slot, the frequency sweep is carried out at slot0 symbol 6. The method comprises the following steps of:
step one, identifying whether the subframe proportioning contains NR time slots or not in a time division multiplexing TDD mode. In a 5G ad hoc network system, the TDD modes currently supported are a TDD mode of full NR time slots, a combined TDD mode of NR time slots plus ad hoc network time slots, and a TDD mode of full ad hoc network time slots. And in a TDD mode comprising NR time slots, carrying out frequency sweep in S time slots of the NR time slots, and in a mode of full-self-networking time slots, carrying out frequency sweep in the first slot of a 10ms NR radio frame.
And step two, under the TDD mode of the full 5G NR time slot or the NR and ad hoc network time slot, a sweep frequency enabling switch is turned on, and a rising edge signal for starting the sweep frequency is set at the initial position of the first complete 10ms NR wireless frame head after the sweep frequency enabling switch is turned on. Under the full NR time slot or NR and Ad hoc network time slot, a sweep enabling switch is opened, and the sweep enabling switch is in sequence in time relative to the frame head of a 10ms NR wireless frame at the time node of opening, so that the following situations exist:
(1) the time node at which the sweep enable switch is on is in an advanced position relative to the 10msNR radio frame header, or just at the same time node. At this time, after the sweep enabling switch is turned on, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node at which the sweep enable switch is on is in a hysteresis position relative to the 10msNR wireless frame header. At this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
Step three, after capturing rising edge signals of the beginning of sweep frequency, an analog gating switch is switched to a channel with corresponding bandwidth, a digital control oscillator NCO of an analog part is switched to a corresponding frequency offset channel, and a digital channel filter is also selected to the channel with corresponding bandwidth. After the sweep enabling switch is turned on, the starting position of the first complete 10ms NR wireless frame head is used as a rising edge signal for starting sweep operation. And because the system supports multi-bandwidth signal models, including bandwidths of 5Mhz,10Mhz,20Mhz,40Mhz,60Mhz and 100 Mhz. The analog and digital parts are required and the associated modules that process the baseband signal are set to the corresponding bandwidths of the required frequency sweeps. For the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter. For example, in a default state, the digital filter is 100Mhz, the NCO of the analog part has no frequency offset, the cavity filter is 100Mhz, at this time, the sweep is required to be performed in a mode with a bandwidth of 5Mhz, at this time, the initial position of the first 10ms nr radio frame after the sweep is enabled to be opened is required to adjust the cavity filters of the digital part and the analog part to a bandwidth channel of 5Mhz, the switching of the channels of the digital filter and the cavity filter is controlled by a register, and the NCO is not required to be adjusted at this time.
Step four, configuring the gap time slot in the s time slot into an uplink time slot, and simultaneously freeing the downlink time slot and the uplink time slot by 2us. In 5G and ad hoc network time slots, since interference except useful time slots needs to be analyzed in the time domain, actual service conditions which do not affect NR of the user need to be considered, the sweep operation is performed only in S time slots of the NR time slots. Since the time slots outside the useful time slots are theoretically full of the transceiving data of the service, the guard interval GAP in the S time slots needs to be set as the uplink time slot U, and in order to prevent the collision between the uplink and downlink data links caused by the removal of the guard interval, the space between the downlink time slot and the uplink time slot is set to be 2us, and the rest of the set U time slots are used as the sweep time slots.
And fifthly, opening a sweep frequency operation switch at the initial position of the uplink time slot, and closing the sweep frequency operation switch at the position of the interval 34 us. And simultaneously recovering NCO, recovering an analog gating switch and recovering a digital filter. In step four, at the starting position of the modified uplink timeslot, that is, at a position 2us away from the starting position of the original GAP timeslot, the sweep operation switch is turned on, the sweep operation switch is turned off at a position spaced by 34us, 4096 data are read in the time when the sweep operation switch is turned on, and the accurate time for the sweep operation switch to last is 8.138ns by 4096=33.33 us, taking a clock of 122.88Mhz as an example, and the unit time is 8.138 ns. And when the sweep operation switch is closed, the digital filter and the cavity filter of the analog part are restored to a default state before the sweep operation is executed, and the condition is that the sweep operation is completed.
And step six, writing the swept data into a memory ram, reading the swept data by software, storing the swept data into a bin file, and reporting the data to the BBU through the CPRI. And writing the data read by the sweep frequency operation into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the data output of the ram to a BBU through CPRI for data analysis.
And step seven, identifying whether all subframes in the subframe proportion are self-networking time slots in a TDD mode, and if so, opening a sweep enabling switch. Under the time slot of the full ad hoc network, a sweep enabling switch is turned on, and the sweep enabling switch is in sequence in time relative to the frame head of a 10msNR wireless frame at the time node of being turned on, so that the following situations exist:
(1) the time node at which the sweep enable switch is on is in an advanced position relative to the 10msNR radio frame header, or just at the same time node. At this time, after the sweep enabling switch, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node at which the sweep enable switch is on is in a hysteresis position relative to the 10msNR wireless frame header. At this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
Step eight, at the initial position of the first 10ms NR wireless frame head after the sweep enabling switch is opened, the positions with the length of 5 symbols are separated, the analog gating switch is switched to a channel with corresponding bandwidth, the NCO of the analog part is switched to the corresponding frequency offset position, and meanwhile, the digital channel filter is also selected to the corresponding bandwidth. In the TDD mode of the full-automatic networking time slot, the method is agreed to send verification information at the slot0 symbol6 position, and after capturing data through frequency sweep, the time delay of the signal is verified, and whether the quality of the signal accords with expectations or not is judged. The starting position of the first complete 10ms NR wireless frame head after the sweep enabling switch is opened is 5 symbol long, and the starting position of the sixth symbol is used as a rising edge signal for starting sweep operation. And because the system supports multi-bandwidth signal models, including bandwidths of 5Mhz,10Mhz,20Mhz,40Mhz,60Mhz and 100 Mhz. The analog and digital parts are required and the associated modules that process the baseband signal are set to the corresponding bandwidths of the required frequency sweeps. For the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter. For example, in a default state, the digital filter is 100Mhz, the NCO of the analog part has no frequency offset, the cavity filter is 100Mhz, when the sweep is required in the mode of 5Mhz bandwidth, then the initial position of the 6 th symbol of the first complete 10ms nr wireless frame after the sweep is enabled to be opened is required, the cavity filters of the digital part and the analog part are both adjusted to the bandwidth of 5Mhz, the switching of the digital filter and the cavity filter is controlled by a register, and the NCO does not need to be adjusted at this time.
And step nine, setting a sweep frequency running switch at the initial position of the sixth symbol, closing the sweep frequency switch at the position of the interval 34us, recovering NCO, recovering an analog gating switch, and recovering the digital filter. In step eight, at the start position of the 6 th symbol of the first complete 10ms nr radio frame after the turn-on of the sweep enable, the sweep operation switch is turned on, and at the position of the interval 34us, the sweep operation switch is turned off, where the duration of the sweep operation switch is equal to the time of writing 4096 data, and, taking a clock of 122.88Mhz as an example, the unit time is 8.138ns, and the accurate duration of the sweep operation is 8.138ns×4096=33.33 us. And when the sweep operation switch is closed, the digital filter and the cavity filter of the analog part are restored to a default state before the sweep operation is executed, and the condition is that the sweep operation is completed.
And step ten, storing the swept data into ram, reading the data by software, storing the data into a bin file, and reporting the data to the BBU through CPRI. And writing the read data of the sweep frequency into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the output of the ram to a BBU through CPRI for data analysis.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (11)
1. The multi-bandwidth frequency sweep method of the 5G ad hoc network system is characterized by comprising the following steps of:
step one, in a time division multiplexing TDD mode, identifying whether an NR time slot is contained in a subframe proportion; if yes, entering a second step, and if not, entering a seventh step;
step two, a sweep enabling switch is turned on, and a rising edge signal for starting sweep is set at the initial position of the first complete 10ms NR wireless frame head after the sweep enabling switch is turned on;
step three, after capturing a rising edge signal of the beginning of sweep frequency, driving an analog gating switch to a channel with corresponding bandwidth, driving a digital control oscillator NCO of an analog part to a corresponding frequency offset channel, and simultaneously selecting a digital channel filter to a channel with corresponding bandwidth;
step four, configuring a gap time slot of an s time slot in the NR time slot into an uplink time slot, and simultaneously freeing a downlink time slot and an uplink time slot by 2us;
step five, a sweep frequency operation switch is opened at the initial position of an uplink time slot, the sweep frequency operation switch is closed at the position of a gap 34us, simultaneously, a digital control oscillator NCO is recovered, an analog gating switch is recovered, and a digital filter is recovered;
step six, writing the swept data into a memory ram, reading the swept data by software, storing the swept data into a bin file, and reporting the data to a BBU through CPRI;
step seven, in the time division multiplexing TDD mode, identifying whether all subframes in the subframe proportion are self-networking time slots, if so, turning on a sweep enabling switch;
step eight, at the initial position of the first 10ms NR wireless frame head after the sweep enabling switch is opened, 5 symbol length positions are separated, an analog gating switch is switched to a channel with corresponding bandwidth, a digital control oscillator NCO of an analog part is switched to a corresponding frequency offset position, and a digital channel filter is also selected to the corresponding bandwidth;
step nine, setting a sweep frequency running switch at the initial position of a sixth symbol, closing the sweep frequency switch at the position of a gap 34us, simultaneously recovering a digital control oscillator NCO, recovering an analog gating switch and recovering a digital filter;
and step ten, storing the swept data into ram, reading the data by software, storing the data into a bin file, and reporting the data to the BBU through CPRI.
2. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the first step is specifically as follows: in the 5G ad hoc network system, the currently supported TDD mode is a full NR time slot TDD mode, a combined NR time slot plus ad hoc network time slot TDD mode, and a full ad hoc network time slot TDD mode; and in a TDD mode comprising NR time slots, carrying out frequency sweep in S time slots of the NR time slots, and in a mode of full-self-networking time slots, carrying out frequency sweep in the first slot of a 10ms NR radio frame.
3. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the second step is specifically as follows: under the full NR time slot or NR and Ad hoc network time slot, a sweep enabling switch is opened, and the sweep enabling switch is in sequence in time relative to the frame head of a 10ms NR wireless frame at the time node of opening, so that the following situations exist:
(1) the time node of the sweep enabling switch is on, is in an advanced position relative to the frame head of the 10msNR wireless frame, or is just in the same time node; at this time, after the sweep enabling switch is turned on, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node of the sweep enabling switch being on is in a hysteresis position relative to the frame head of the 10msNR wireless frame; at this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
4. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the third step is specifically as follows: after the sweep enabling switch is opened, the initial position of the first complete 10ms NR wireless frame head is used as a rising edge signal for starting sweep operation; setting the module for processing the baseband signal to be the corresponding bandwidth of the required sweep frequency by the analog part and the digital part; for the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter.
5. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 4, wherein: the fourth step is specifically as follows: in 5G and ad hoc network time slots, since the time slots other than the useful time slots are theoretically full of the traffic transceiving data, the guard interval GAP in the S time slots needs to be set to be the uplink time slot U at this time, and in order to prevent collision between the uplink and downlink data caused by removing the guard interval, the interval between the downlink time slot and the uplink time slot is set aside by 2us and used as a new custom "guard time slot", and the remaining set U time slots are used as sweep time slots.
6. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 5, wherein: the fifth step is specifically as follows: in step four, at the initial position of the modified uplink timeslot, that is, at a position 2us away from the initial position of the original GAP timeslot, the sweep operation switch is turned on, the sweep operation switch is turned off at a position spaced by 34us, 4096 data are read in the time when the sweep operation switch is turned on, and the digital filter and the cavity filter of the analog part are restored to a default state before the sweep operation is executed while the sweep operation switch is turned off, which indicates that the sweep operation is completed.
7. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the sixth step is specifically as follows: and writing the data read by the sweep frequency operation into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the data output of the ram to a BBU through CPRI for data analysis.
8. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the seventh step is specifically as follows: under the time slot of the full ad hoc network, a sweep enabling switch is turned on, and the sweep enabling switch is in sequence in time relative to the frame head of a 10msNR wireless frame at the time node of being turned on, so that the following situations exist:
(1) the time node of the sweep enabling switch is on, is in an advanced position relative to the frame head of the 10msNR wireless frame, or is just in the same time node; at this time, after the sweep enabling switch, or when the sweep enabling switch is just turned on, the frame head of the 10ms NR wireless frame comes, and at this time, after the sweep enabling switch is turned on, the expectation of sweep operation is started at the complete 10ms NR wireless frame starting position;
(2) the time node of the sweep enabling switch being on is in a hysteresis position relative to the frame head of the 10msNR wireless frame; at this time, after the sweep enabling switch is turned on, the current 10ms radio frame is missing, the integrity of the sweep function is not guaranteed, and the sweep operation needs to be started at the starting position of the next 10ms nr radio frame.
9. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the method comprises the following steps: in the TDD mode of the full-Ad hoc network time slot, transmitting verification information at the slot0 symbol6 position, and verifying the time delay of a signal after capturing data through frequency sweep, wherein the quality of the signal accords with the expectation; the method comprises the steps that after a sweep enabling switch is turned on, the initial position of a first complete 10ms NR wireless frame head is 5 symbols away from the length of the first frame head, and the initial position of a sixth symbol is used as a rising edge signal for starting sweep operation; since the system supports multi-bandwidth signal models, including bandwidths of 5Mhz,10Mhz,20Mhz,40Mhz,60Mhz and 100Mhz, the analog and digital parts are required, and the module for processing the baseband signal is set to the corresponding bandwidth of the required frequency sweep; for the downlink of the system, firstly, a digital filter is passed, then an analog cavity filter is passed, and finally, an analog NCO is obtained; for the uplink of the system, the analog NCO is passed first, then through the analog cavity filter, and finally to the digital filter.
10. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 9, wherein: the step nine specifically comprises the following steps: in the eighth step, at the start position of the 6 th symbol of the first complete 10ms nr radio frame after the turn-on of the sweep enable, the sweep operation switch is turned on, and at the position of the interval 34us, the sweep operation switch is turned off, the duration of the sweep operation switch is equal to the time of writing 4096 data, and the digital filter and the cavity filter of the analog part are restored to the default state before the sweep operation is executed while the sweep operation switch is turned off, which indicates that the sweep operation is completed.
11. The multi-bandwidth frequency sweep method of a 5G ad hoc network system according to claim 1, wherein: the method comprises the following steps: and writing the read data of the sweep frequency into a memory ram, assigning the output of the ram to a register, reading the data by software in a mode of reading the data corresponding to the register address, storing the data in a bin file, and reporting the output of the ram to a BBU through CPRI for data analysis.
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