CN110769447B - Automatic configuration method for uplink and downlink time slots of 5G NR cell - Google Patents

Automatic configuration method for uplink and downlink time slots of 5G NR cell Download PDF

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CN110769447B
CN110769447B CN201911055883.5A CN201911055883A CN110769447B CN 110769447 B CN110769447 B CN 110769447B CN 201911055883 A CN201911055883 A CN 201911055883A CN 110769447 B CN110769447 B CN 110769447B
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uplink
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lte
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CN110769447A (en
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段红光
王月
郑建宏
罗一静
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Chongqing University of Post and Telecommunications
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Abstract

The invention relates to an automatic configuration method of uplink and downlink time slots of a 5G NR (noise figure) cell, belonging to the field of fifth-generation mobile communication and comprising the following steps of 1: powering on and starting up the newly-built NR cell, and searching and reading signals of the adjacent NR cell; step 2: if the newly-built NR cell does not search a nearby effective NR cell, searching and reading a nearby LTE cell; and step 3: if the newly-built NR cell fails to search the adjacent NR cells and the LTE cell, the newly-built NR cell uses the self-default time base and uplink and downlink configuration, and records the uplink and downlink time slot configuration used by the cell configuration and the configuration of a special time slot; and 4, step 4: calculating the time base and uplink and downlink configuration of the newly-built NR cell according to the frame positioning time base and the uplink and downlink symbol configuration determined by the adjacent NR cell or the LTE cell or by adopting the default time base and the uplink and downlink configuration; and 5: and setting a frame time base and upper and lower configuration parameters of the newly-built NR cell.

Description

Automatic configuration method for uplink and downlink time slots of 5G NR cell
Technical Field
The invention belongs to the technical field of micro base stations in the field of fifth generation mobile communication, and particularly relates to frame timing and uplink and downlink time slot configuration of a base station.
Background
In the field of mobile communication, information is transmitted in a wireless mode, and a base station cannot accurately position the position of a terminal in real time due to the movement of the terminal. The radio frequencies used by adjacent terminals may be closely spaced, especially in a same-frequency networking scenario of a time division multiplexing mode, and at the same time, the requirements of transmitter out-of-band radiation cannot be completely eliminated due to the realization cost and technical limitations of the terminals. If the time between the cells is not synchronous, the signal sent by one terminal falls into the receiver of another terminal, and submerges the information sent by the network side, resulting in the reduction of communication quality, so that when the long term evolution (LTE for short) is deployed, the adjacent cells use the same uplink and downlink time slot ratio as much as possible and are in a synchronous state.
Radio frequencies belong to limited resources, and the new radio (abbreviated as 5G NR) of the fifth generation mobile communication system defines two working frequency bands, namely, working frequency bands FR1(410 MHz-7125 MHz) and FR2(24250 MHz-52600 MHz). The FR1 frequency band includes the LTE operating band. In principle, the frequency band occupied by LTE in the deployment area cannot be reused by the 5G NR cell, so that the 5G NR can only use high-frequency band radio resources, and since the high-frequency signal attenuation is large and the networking radius is small, an auxiliary downlink (SDL) and an auxiliary uplink (SUL) are added to the 5G NR to increase the cell coverage radius and enhance the terminal uplink transmission distance, but the SDL and the SUL also belong to the conventional frequency band of LTE. Therefore, in the future, the situation of LTE and 5G NR co-frequency networking and adjacent networking is inevitable for a long time.
The FR1 frequency band according to 3GPP TS38.101-1 is defined as shown in Table 1.
TABLE 15 FR1 frequency definition in the G NR System
Figure GDA0003526088610000011
Figure GDA0003526088610000021
Table 1 defines the FR1 band, where both the n75 and n76 SDL bands are 1.4GHz bands. And the frequency ranges of the n80, n81, n82, n83, n84 and n86 frequency bands are from 703MHz to 1.785GHz, and belong to LTE conventional frequency bands.
Currently, from the whole 5G NR standard and practical operation, the supportable frequency of 5G NR is higher and higher, FR2 is a millimeter wave frequency band, and the specific frequency band definition table 2 shows.
TABLE 25 FR2 frequency definition in NR systems
Frequency band Uplink frequency Downstream frequency Duplex mode
n257 26500MHz–29500MHz 26500MHz–29500MHz TDD
n258 24250MHz–27500MHz 24250MHz–27500MHz TDD
n260 37000MHz–40000MHz 37000MHz–40000MHz TDD
n261 27500MHz–28350MHz 27500MHz–28350MHz TDD
Regarding the networking mode of 5G NR, EN-DC (NSA), NGEN-DC, NE-DC and SA are provided in the 3GPP TS37.340 specification. No matter what networking mode is selected, the basic principle is to add a 5G NR cell on the basis of maintaining the existing LTE deployment, so the 5G NR cell basically uses higher frequency resources or uses the same-frequency networking mode with the LTE cell.
From an economic as well as a technical point of view, there are currently two main ways of deploying 5G NRs. Mode 1: LTE and 5G NR cell hybrid coverage, mode 2: only 5G NR cells are deployed. The typical scenario of the mode 1 is shown in fig. 1.
As shown in fig. 1, since the LTE cell uses a lower frequency band, the radius of the cell is large, and the radio coverage range can be generally several hundred meters or even several kilometers, but even if the 5G NR cell uses the FR1 frequency band, the cell operates at sub 6GHz, and avoids the LTE frequency band already deployed and used, the operating frequency is also in a higher range, and thus the radius of the cell coverage is small, and is generally only several tens of meters. The cell coverage radius of the FR2 frequency band is much smaller, typically only up to tens of meters. In the mixed coverage area of NR and LTE cells, interference between cells and between transmission and reception of different terminals cannot be avoided.
In a 5G NR and LTE cell mixed coverage networking scenario, when a time division multiplexing mode is used or the distance between uplink and downlink frequency points is too close, signals transmitted by nearby terminals or neighboring cells may also interfere with normal reception of the terminal of the cell, so in LTE or 5G NR networking, a different frequency point networking mode is used in a cell, neighboring cells use a same frequency networking mode, and use the same uplink and downlink configuration, and if a 5G NR and LTE cell mixed coverage scenario is used, synchronization is also required during deployment, and the same uplink and downlink matching is used, as shown in fig. 2.
In the example of fig. 2, according to the description of the TD-LTE uplink and downlink configuration table 3 in 3GPP TS36.211, the uplink and downlink ratio of the TD-LTE cell is 2. In TD-LTE cell special subframe configuration table 4, the special subframe configuration of TD-LTE cell is 7. From fig. 2, it can be derived that as long as the 5G NR cell selects a suitable uplink and downlink symbol configuration, the requirement of uplink and downlink alignment of the 5G NR cell and the LTE cell can be achieved.
TABLE 3 TD-LTE cell uplink and downlink configuration table
Figure GDA0003526088610000031
Table 4 special timeslot configuration table in TD-LTE cell
Figure GDA0003526088610000032
In the following, from the structural characteristics of the 5G NR and LTE frame, it is analyzed that any uplink and downlink of the LTE cell and the configuration of the special subframe in the 5G NR can be selected to meet the requirement of uplink and downlink alignment with the LTE cell.
Regarding the LTE frame structure, according to the definition of 3GPP TS 36.211: frame length T of TD-LTE framef＝307200·Τs10ms, consisting of 10 sub-frames, each having a length of 30720 & taus1 ms. Each frame can be divided into two half-frames, each half-frame length 153600. taus＝5ms。
According to the definition of 3GPP TS38.211, the length of the 5G NR frame is also 10ms, each frame is divided into two half frames, each half frame is composed of 5 subframes, and each frame has the length of Tf＝(ΔfmaxNf/100)·Tc10ms, the length of each subframe is: t issf＝(ΔfmaxNf/1000)·Tc1ms, where Tc＝1/(ΔfmaxNf)，Δfmax＝480x103Hz and Nf4096, and K ═ Ts/Tc＝64，Ts＝1/(Δfref·Nf,ref)，Δfref＝15·103Hz and Nf,ref2048. From the above analysis, it can be known that the frame structures of LTE and 5G NR are different mainly in subcarrier spacing size and Fast Fourier Transform (FFT) point number.
Analyzed from the OFDM principle, a symbol length is a time length occupied by a subcarrier interval, and a time length T of one symbol in LTEsymobl2048, (1/15 k). In 5G NR, since there are various subcarrier spacings, the symbol time length for each configuration parameter of 5G NR can be calculated similarly as in table 5.
TABLE 55G one symbol time length Table in NR System
Figure GDA0003526088610000041
From the above analysis, it can be seen that one LTE symbol length occupies the longest time and is an integral multiple of the 5G NR symbol length, so that alignment between LTE uplink and downlink configurations and 5G NR uplink and downlink configurations can be achieved.
In the current actual deployment network, the selection timing and uplink and downlink configuration parameters of the 5G NR are preset before deployment of the NR cells, and if the configuration of the LTE cell changes, all NR cells should be configured by modification, otherwise, the interference of the LTE and NR hybrid coverage area will be increased, which greatly increases the engineering cost of 5G NR deployment.
Disclosure of Invention
In view of this, the present invention provides a method for an NR cell to automatically configure uplink and downlink in response to the problem in the LTE and NR hybrid coverage networking scenario. The basic principle is that a newly-built NR cell powered on and powered on is started up to search nearby NR and LTE cells, find the frame synchronization position of the existing network, decipher the system message block 1(SIB1 for short) of the cell, acquire the uplink and downlink configuration and special subframe configuration parameters of the cell, determine the time base of the newly-built NR cell according to the searched cell time base, determine the uplink and downlink configuration of the newly-built NR cell according to the searched cell uplink and downlink configuration, and ensure that the uplink transmission and downlink reception of the existing cell of the newly-built NR cell are consistent.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for automatically configuring uplink and downlink time slots of a 5G NR cell comprises the steps of automatically configuring the uplink and downlink time slots through a cell searching module, a cell system message reading module, an NR cell uplink and downlink configuration calculation module and an NR cell uplink and downlink parameter configuration module;
the cell search module is used for searching an NR cell and an LTE cell near the newly-built NR cell, firstly searching the NR cell and determining the frame timing of the NR cell, and if the NR cell information is not searched, searching the LTE cell and determining the frame timing of the LTE cell;
the cell system message interpretation module finishes interpretation of a searched NR cell or LTE cell system message block 1 and acquires frame synchronization information and uplink and downlink configuration information of the NR cell or LTE cell;
the NR cell uplink and downlink configuration calculation module calculates the time base and uplink and downlink configuration of the NR cell according to the obtained frame synchronization and uplink and downlink configuration information;
and the uplink and downlink parameter configuration module of the NR cell sets the time base and uplink and downlink configuration of the newly-built NR cell and requires the NR cell to work in the time base and uplink and downlink configuration.
Further, the method comprises the following steps:
step 1: starting up and powering up a newly-built NR cell, and performing a nearby NR cell searching process, wherein the process comprises measuring an NR frequency point and searching an SSB (synchronous signal/physical broadcast channel, SS/PBCH) block; if a valid SSB block is searched, the system message block 1(SIB1) content of the NR cell is interpreted, and the uplink and downlink time slot configuration used by the NR cell configuration and the configuration of a special time slot are recorded; if all the SSB blocks or SIB1 of the NR cells interpret the error, then a nearby LTE cell search is conducted;
step 2: if the newly-built NR cell does not search a nearby effective NR cell, starting a searching process of a nearby LTE cell, wherein the searching process comprises measuring an LTE frequency point, searching primary synchronization signal/secondary synchronization signal (PSS/SSS) information of the LTE cell, reading a primary information block (MIB) of the LTE cell, reading SIB1 block content of the LTE cell, and recording uplink and downlink time slot configuration used by the LTE cell configuration and special time slot configuration;
and step 3: if the newly-built NR cell fails to search the adjacent NR cells and the LTE cell, the newly-built NR cell uses self-default time base and uplink and downlink configuration, the default time base and uplink and downlink configuration are marked as DefaultStartFrameTiming, and the uplink and downlink time slot configuration used by the cell configuration and the configuration of a special time slot are recorded;
and 4, step 4: the newly-built NR cell calculates the time base and uplink and downlink configuration of the newly-built NR cell according to the frame positioning time base and uplink and downlink symbol configuration determined by the adjacent NR cell or LTE cell or by adopting the default time base and uplink and downlink configuration;
and 5: and setting the frame time base and the up-down configuration parameters of the newly-built NR cell according to the calculated time base and the up-down configuration parameters of the newly-built NR cell.
Further, in step 1, the recording of the uplink and downlink timeslot configurations used by the NR cell configuration and the configuration of the special timeslot specifically includes: recording the frame head position NrStartFrameTiming of the NR cell and uplink and downlink configuration parameters NrdownlinkSymbols, NrUplinkSymbols and NrUnnonallocationSymbols of the cell.
Further, in step 2, the recording of the uplink and downlink timeslot configurations used by the LTE cell configuration and the configuration of the special timeslot specifically includes: recording the frame head position LteStartFrameTiming of the LTE cell and uplink and downlink configuration parameters LteDownlinkSymbols and LteUplinkSymbols of the cell.
Further, in step 3, the newly-built NR cell uses its own default time base and uplink and downlink configuration, and is recorded as DefaultStartFrameTiming, and uplink and downlink configuration parameters of the cell, DefaultDownlinkSymbols, defaultuplinklymbols, and defaultuninacollation symbols, are recorded;
the recording of the uplink and downlink time slot configuration used by the cell configuration and the configuration of the special time slot specifically includes recording uplink and downlink time slot configuration parameters, DefaultDownlinkSymbols, defaultuplinklandsymbols, and defaultulinaconcesymbols, used by the cell configuration.
The invention has the beneficial effects that: with the maturity and commercialization progress of the 5G technology, it is impossible to remove the LTE base station that has been built in a short time, so that mixed coverage of 5G NR and LTE inevitably occurs in a long time in the future, and since the frequency range of 5G NR covers the LTE operating band, interference between 5G NR and LTE cells increases, which is not favorable for LTE and 5G NR co-frequency networking.
At present, the most common solution is to perform deployment planning in a manual manner, that is, when a new NR cell is created, first, deployment conditions of nearby NR cells and LTE cells, including working frequency points, bandwidths, time bases, and uplink and downlink configurations of the cells, are manually known, and then, engineering technicians calculate appropriate time bases and uplink and downlink configuration parameters of the new NR cell. This approach can solve the problem of short-term phase trial networking, but it is difficult to meet future large-scale networking scenarios for 5G NR.
The invention provides a method for automatically configuring time base and uplink and downlink of a newly-built NR cell aiming at the existing situation, engineering technical personnel are not needed to participate in the process of newly-built NR cell, the newly-built cell automatically detects nearby NR cells and LTE cells, and the time base and uplink and downlink configuration is automatically completed, so that the engineering cost of the newly-built NR cell is greatly saved, and the quality of wireless signals covered by LTE and 5G NR in a mixed mode is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic diagram of a networking mode of LTE and 5G NR hybrid coverage;
fig. 2 is a diagram of synchronization and uplink and downlink configuration of 5G NR and LTE hybrid coverage;
fig. 3 is a functional diagram of automatic timing determination and uplink and downlink configuration of a newly-built NR cell;
fig. 4 is a flow chart of automatically determining timing and uplink and downlink configuration of a newly-built NR cell;
fig. 5 is a block diagram of an implementation of automatic parameters of a newly-built NR cell;
fig. 6 is a flow chart of the implementation of timing determination and uplink and downlink configuration of the newly-built NR cell;
fig. 7 is a diagram of an example of uplink and downlink configuration parameters of an NR cell;
fig. 8 is a configuration diagram of a newly-built NR cell and a nearby LTE cell.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The invention provides an automatic configuration method of uplink and downlink time slots of a 5G NR (noise generation) cell, which comprises 4 parts, namely a cell search module, a cell system message reading module, an NR cell uplink and downlink configuration calculation module and an NR cell uplink and downlink parameter configuration module, as shown in figure 3. The module searches the NR cell and determines the frame timing of the NR cell, and if the NR cell information is not searched, the module searches the LTE cell and determines the frame timing of the LTE cell. And the cell system message interpretation module finishes interpretation on the searched NR cell or LTE cell system message block 1 and acquires frame synchronization information and uplink and downlink configuration information of the NR cell or LTE cell. And the NR cell uplink and downlink configuration calculation module calculates the time base and uplink and downlink configuration of the NR cell according to the obtained frame synchronization and uplink and downlink configuration information. And the NR cell uplink and downlink parameter configuration module sets the time base and uplink and downlink configuration of the newly-established NR cell and requires the NR cell to work in the time base and uplink and downlink configuration.
The specific implementation process of the invention is as follows:
step 1: and starting and powering on the newly-built NR cell, and performing a nearby NR cell searching process, wherein the process comprises measuring an NR frequency point and searching an SSB (synchronous signal/physical broadcast channel, SS/PBCH) block. If a valid SSB block is searched, the system message block 1(SIB1) content of the NR cell is interpreted, and the NR cell frame header position NrStartFrameTiming and the uplink and downlink configuration parameters NrDownlinkSymbols, NrUplinkSymbols and NrUnnallotionongSymbols of the cell are recorded. If all the NR cells' SSB blocks or SIB1 interpret the error, a nearby LTE cell search is conducted. As shown in steps 1, 2 and 6 in fig. 4.
Step 2: if the newly-built NR cell does not search a nearby effective NR cell, starting a searching process of a nearby LTE cell, wherein the searching process comprises measuring an LTE frequency point, searching primary synchronization signal/secondary synchronization signal (PSS/SSS) information of the LTE cell, reading a Master Information Block (MIB) of the LTE cell, reading the SIB1 block content of the LTE cell, and recording a frame header position LtestartFrameTiming of the LTE cell and uplink and downlink configuration parameters LteDownlinkSymbols and LteUplinkSymbols of the cell. As shown in steps 3, 4 and 6 of fig. 4.
And step 3: if the new NR cell fails to search for both the nearby NR cell and the LTE cell, the new NR cell uses its default time base and uplink and downlink configuration, which is recorded as DefaultStartFrameTiming, and records the uplink and downlink configuration parameters of the cell, defaultdownlinlinsymbols, defaultuplinklymbols, and defaultnonallocationsymbols. As shown in steps 5 and 6 of fig. 4.
And 4, step 4: and the newly-built NR cell calculates the time base and uplink and downlink configuration of the newly-built NR cell according to the frame positioning time base and uplink and downlink symbol configuration determined by the adjacent NR cell or the LTE cell or by adopting the default time base and uplink and downlink configuration. As shown in step 7 of fig. 4.
And 5: and setting the frame time base and the up-down configuration parameters of the newly-built NR cell according to the calculated time base and the up-down configuration parameters of the newly-built NR cell. As in step 8 of fig. 4.
In order to explain the application of the present invention in an actual gbb base station, a method for using the present invention in a specific base station is provided below, and in the existing gbb base station system, parameters such as uplink and downlink configuration and the like can be manually set through a background, so that the present invention adds two modules in the existing mature gbb base station, and creates an NR cell automatic generation time base and uplink and downlink configuration parameter module and an automatic NR cell parameter configuration table module, as shown in fig. 5.
The method comprises the following specific using process that after a newly-built gNB cell is started, a module for automatically generating time base and uplink and downlink configuration parameters by using the newly-built NR cell is used for searching nearby NR or LTE cells to generate the time base and uplink and downlink configuration parameters of the newly-built gNB cell. And in addition, uplink and downlink configuration parameters are directly input into an automatic NR cell parameter configuration table to form an input format which can be automatically identified by the newly-built gNB cell.
Remarking: in the present embodiment, the gNB cell and the NR cell belong to the same concept and both represent 5G NR cells.
The method is specifically implemented in a module for automatically generating time base and uplink and downlink configuration parameters of a newly-built gNB cell. In order to more clearly illustrate the implementability of the present invention, specific implementation flow steps are given below, as shown in fig. 6.
Step 1: and powering on and starting up the newly-built gNB cell, and carrying out a nearby NR cell searching process, namely carrying out a blind searching process of the NR cell by the gNB cell according to a frequency band supported by the gNB cell. In the process, firstly, GSCN frequency point measurement is carried out on a frequency band supported by a newly-built gNB cell, then sequencing is carried out according to signal frequency point intensity, and SSB search is carried out on frequency points from strong to weak in sequence. As shown in steps 1, 2 and 7 in fig. 6.
The SSB search procedure, including searching for Primary Synchronization Signals (PSS) and Secondary Synchronization Signals (SSS) of an NR cell and interpreting mib (PBCH), confirms that the NR cell exists and can be interpreted if the CRC check interpreting the PBCH block is correct.
The system message block 1 of the NR cell is interpreted according to the NR cell frame timing determined by PBCH interpretation. In the NR SIB1 system message, the uplink and downlink configuration parameters of the cell are acquired from SIB1 → ServingCellConfigCommonSIB → TDD _ UL _ DL _ ConfigCommon. There are mainly five parameters dl _ UL _ transmissionperiodicities, nroflolink slots, nroflolink symbols, nroflolink slots and nroflolink symbols. As shown in fig. 7.
In this embodiment, the timing and uplink and downlink configurations of nearby NR cells are denoted as nstartframetiming, NrDownlinkSymbols, nrupllinksymbols, and nrunnalcationsymbols. As shown in fig. 7.
Step 2: if no valid NR cell is searched in the new gNB cell during the search of the neighboring NR cell, i.e. no NR signal is detected, the decoding of the SSB block fails and the decoding of the SIB1 fails. Then the newly created gbb cell will start the nearby LTE cell search procedure. As shown in steps 3, 4 and 6 of fig. 6.
The method comprises the steps of firstly carrying out blind search on LTE frequency bands, searching LTE frequency points of all signals, then sequencing the signals of the LTE frequency points from strong to weak, sequentially searching a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) on the LTE frequency points, finally reading information of a master information block (MIB for short) on the frequency points, and determining frame timing of an LTE cell.
According to the frame timing position of the LTE cell, the system message block 1 content of the LTE cell is decoded, and in the LTE system message block 1, SystemInformationBlockType1 → tdd _ Config → subframe assignment and SystemInformationBlockType1 → tdd _ Config → specularieffetters, wherein the subframe assignment parameter corresponds to Table 4.2-2: Uplink-downlink configurations in 3GPP TS 36.211. The speculalsubframepatterns parameter corresponds to Table 4.2-1: Configuration of special subframe (length hs of DwPTS/GP/UpPTS) in 3GPP TS 36.211. According to table 4 in the background art of the present invention, as well as the LTE uplink and downlink subframe configuration subframe assignment parameter and the special subframe configuration parameter specialSubframePatterns, LTE cell information is recorded as ltestattrming, ltetedlinlinksymbols, and lteteuplinlinksymbols.
And step 3: if the search for LTE cells fails or fails to find a valid LTE cell, i.e., no LTE signal is searched and the interpretation of MIB blocks fails or SIB1 fails. The newly created nb cell will use the default parameters DefaultStartFrameTiming, DefaultDownlinkSymbols, defaultuplinklymbols, and defaultuninalogenosimbols. As in step 5 of fig. 6.
And 4, step 4: and the newly-built gNB cell determines the timing and up-and-down configuration of the cell, and if a nearby NR cell is searched or a default configuration parameter is adopted, the newly-built gNB cell directly adopts the nearby NR parameter or the default parameter. However, if the LTE cell scenario is adopted, the LTE cell and NR cell time base and uplink and downlink alignment operations need to be performed. As in step 8 of fig. 6.
Specific LTE cell scenarios, NR cells, and LTE cell mapping rules are shown in fig. 8.
Timing of NR cell: the frame timing of the LTE cell starts to the end point of the uplink symbol adjacent to the first special subframe.
And (3) uplink and downlink configuration of the NR cell: the occupation time of the number of uplink symbols of the NR cell is the occupation time length of continuous uplink symbols of the corresponding LTE cell, the occupation time of the number of downlink symbols of the NR cell is the occupation time length of continuous downlink symbols of the corresponding LTE cell, and the number of unassigned symbols of the NR cell is the spare unassigned part in the special time slot of the corresponding LTE cell.
And 5: and configuring parameters of the newly-built gNB cell according to the determined parameters of the NrStartFrameTiming, the NrDownlinkSymobls, the NrUplinikSymbols and the NrUnnallotionSymbols. In the NR SIB1 system message of the cell, SIB1 → servingcellconfigcommon SIB → TDD _ UL _ DL _ ConfigCommon acquires uplink and downlink configuration parameters of the cell, where there are mainly five parameters DL _ UL _ transmission periodicity, nfdownlinkslots, nfdownlinlinksymbols, nfuplinlnkslots, and nfuplinlinksymbols. As in step 9 of fig. 6.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (6)

1. A method for automatically configuring uplink and downlink time slots of a 5G NR cell is characterized in that: the uplink and downlink time slots are automatically configured through a cell searching module, a cell system message reading module, an NR cell uplink and downlink configuration calculation module and an NR cell uplink and downlink parameter configuration module;
the cell search module is used for searching an NR cell and an LTE cell near the newly-built NR cell, firstly searching the NR cell and determining the frame timing of the NR cell, and if the NR cell information is not searched, searching the LTE cell and determining the frame timing of the LTE cell;
the cell system message interpretation module finishes interpretation of a searched NR cell or LTE cell system message block 1 and acquires frame synchronization information and uplink and downlink configuration information of the NR cell or LTE cell;
the NR cell uplink and downlink configuration calculation module calculates the time base and uplink and downlink configuration of the NR cell according to the obtained frame synchronization and uplink and downlink configuration information;
and the uplink and downlink parameter configuration module of the NR cell sets the time base and uplink and downlink configuration of the newly-built NR cell and requires the NR cell to work in the time base and uplink and downlink configuration.
2. The method of claim 1, wherein the method for automatically configuring uplink and downlink timeslots of the 5G NR cell comprises: the method comprises the following steps:
step 1: the newly-built NR cell is powered on and started up, and a nearby NR cell searching process is carried out, wherein the process comprises the steps of measuring an NR frequency point and searching an SSB block; if the valid SSB block is searched, the SIB1 content of the NR cell is interpreted, and the uplink and downlink time slot configuration used by the NR cell configuration and the configuration of the special time slot are recorded; if all the SSB blocks or SIB1 of the NR cells interpret the error, then a nearby LTE cell search is conducted;
step 2: if the newly-built NR cell does not search a nearby effective NR cell, starting a searching process of a nearby LTE cell, wherein the searching process comprises measuring an LTE frequency point, searching primary synchronization signal/secondary synchronization signal PSS/SSS information of the LTE cell, reading a primary information block MIB of the LTE cell, reading SIB1 block content of the LTE cell, and recording uplink and downlink time slot configuration used by the LTE cell configuration and special time slot configuration;
and step 3: if the newly-built NR cell fails to search the adjacent NR cells and the LTE cell, the newly-built NR cell uses self-default time base and uplink and downlink configuration, the default time base and uplink and downlink configuration are marked as DefaultStartFrameTiming, and the uplink and downlink time slot configuration used by the cell configuration and the configuration of a special time slot are recorded;
and 4, step 4: the newly-built NR cell calculates the time base and uplink and downlink configuration of the newly-built NR cell according to the frame positioning time base and uplink and downlink symbol configuration determined by the adjacent NR cell or LTE cell or by adopting the default time base and uplink and downlink configuration;
and 5: and setting the frame time base and the up-down configuration parameters of the newly-built NR cell according to the calculated time base and the up-down configuration parameters of the newly-built NR cell.
3. The method of claim 2, wherein the method for automatically configuring uplink and downlink timeslots of the 5G NR cell comprises: in step 1, the recording of the uplink and downlink time slot configuration used by the NR cell configuration and the configuration of the special time slot specifically includes: recording the frame head position NrStartFrameTiming of the NR cell and uplink and downlink configuration parameters NrdownlinkSymbols, NrUplinkSymbols and NrUnnonallocationSymbols of the cell.
4. The method of claim 2, wherein the method for automatically configuring uplink and downlink timeslots of the 5G NR cell comprises: in step 1, the SSB search procedure includes searching for primary synchronization signal PSS and secondary synchronization signal SSS of an NR cell and interpreting MIB, i.e., PBCH, and if CRC check for interpreting PBCH block is correct, then confirming that the NR cell exists and can be interpreted.
5. The method of claim 2, wherein the method for automatically configuring uplink and downlink timeslots of the 5G NR cell comprises: in step 2, the recording of the uplink and downlink time slot configuration used by the LTE cell configuration and the configuration of the special time slot specifically includes: recording the frame head position LteStartFrameTiming of the LTE cell and uplink and downlink configuration parameters LteDownlinkSymbols and LteUplinkSymbols of the cell.
6. The method of claim 2, wherein the method for automatically configuring uplink and downlink timeslots of the 5G NR cell comprises: in step 3, the newly-built NR cell uses self-default time base and uplink and downlink configuration, and is marked as DefaultStartFrameTiming, and uplink and downlink configuration parameters DefaultDownlinkSymbols, DefaultUplinkSymbols and DefaultUnalogenoSymbols of the cell are recorded;
the recording of the uplink and downlink time slot configuration used by the cell configuration and the configuration of the special time slot specifically includes recording uplink and downlink time slot configuration parameters, DefaultDownlinkSymbols, defaultuplinklandsymbols, and defaultulinaconcesymbols, used by the cell configuration.
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