KR102433807B1 - Wireless communication apparatus and Wireless communication method thereof - Google Patents

Abstract

The present invention relates to a wireless communication device and a wireless communication method thereof, and more particularly, to a wireless communication device capable of supporting various wireless communication technologies through software and a wireless communication method thereof.

Description

Wireless communication apparatus and wireless communication method thereof

The present invention relates to a wireless communication device and a wireless communication method thereof, and more particularly, to a wireless communication device capable of supporting various wireless communication technologies through software and a wireless communication method thereof.
The present invention is a research conducted with the support of the Information and Communication Planning and Evaluation Institute with the funding of the government (Ministry of Science and ICT) in 2019 (No.2018-0-00726, Software-Defined Cell·Beam Search technology development of Beyond-5G concept) ).

With the development of communication technology, many new types of wireless communication technology are being used according to the user's preference or purpose. Most of the wireless communication technologies such as Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-advanced), Wideband Code Division Multiple Access (WCDMA), Mobile WiMAX, Global System for Mobile Communications (GSM), etc. It runs on the terminal as the base station interacts with it.

The modem inside the terminal has its own commands for each manufacturer and implements each wireless communication technology through it. In order for wireless communication applications to control the modem, it must be implemented to use a unique command that the modem can understand depending on the manufacturer. This results in a result that one wireless communication application can control only a terminal of a specific manufacturer or a modem of a specific manufacturer. In order to control various types of modems in one terminal, wireless communication applications using different commands must be installed in the terminal.

However, providing a terminal with a plurality of modems to simultaneously support various types of wireless communication technologies and mounting wireless communication applications for controlling each of them may hinder miniaturization of the terminal and increase manufacturing cost. In addition, the modem, that is, the hardware-based wireless communication technology support method, is inflexible because it is necessary to manufacture a terminal equipped with a new modem whenever a new wireless communication technology is developed.

Embodiments are intended to solve the above problem, and provide a wireless communication device capable of supporting various wireless communication technologies through software without being dependent on hardware such as a modem, and a wireless communication method thereof.

Embodiments provide an operating structure of an integrated wireless communication application that can be freely developed, distributed, installed, and operated in response to various wireless communication technologies.

Embodiments provide a wireless communication device for performing a cell search through an integrated wireless communication application and a wireless communication method thereof.

A wireless communication device according to an embodiment includes at least one physical antenna and a processor for driving a wireless communication software and a radio resource control layer that is an upper layer of the wireless communication software, wherein the wireless communication software includes at least one virtual A searcher bank including hardware, a hardware abstraction layer for virtualizing the at least one physical antenna and the cell searcher to implement as a virtual antenna and a virtual cell searcher in the searcher bank, a searcher scheduler for controlling the virtual antenna and the virtual cell searcher, and and an interface between the searcher scheduler and the radio resource control layer.

Communication between the virtual hardware and between the virtual hardware and the hardware abstraction layer may be performed through a register interface.

When a cell search request for initial cell search is received from the radio resource control layer, the searcher scheduler controls the virtual antenna in an on state and performs a full cell search based on a frequency number to be searched for the virtual cell. You can control the searcher.

The virtual cell searcher may search for a synchronization signal from radio signals of all timings received through the virtual antenna, and transmit a search response including synchronization information for the searched synchronization signal to the searcher scheduler.

The searcher scheduler stores the synchronization information received from the virtual cell searcher in a database, and when a channel establishment request for a specific synchronization signal is received from the radio resource control layer, the synchronization of the specific synchronization signal from the database The virtual antenna and the virtual cell searcher may be controlled to perform partial cell search by extracting information.

The searcher scheduler controls the virtual antenna to compensate the time/frequency of the virtual antenna based on the time/frequency offset of the extracted synchronization information, and a cell network id, window, and SSB (Synchronization) of the extracted synchronization information. The virtual cell searcher may be controlled to search for a corresponding synchronization signal based on at least one of a signal block) index, a half frame, and a frequency number.

The virtual cell searcher may search for the synchronization signal with priority around the time offset when performing the partial cell search.

When a cell measurement request for a specific synchronization signal is received from the radio resource control layer, the searcher scheduler transmits an acknowledgment to the radio resource control layer and then, when a cell measurement is possible, the virtual antenna is The virtual cell searcher may be controlled to be turned on and to perform a partial cell search of the specific synchronization signal requested for cell measurement.

The wireless communication software includes program code for controlling on/off of the virtual hardware, wherein the program code includes an external loop in which an operation of monitoring an on signal in an off state of the virtual hardware is defined and within the external loop. It may include an internal loop in which a repetition operation performed in an ON state of the virtual hardware is defined when the ON signal is received.

The internal loop may define an operation of reading a real-time setting register value to set a parameter, an operation of performing a preset function based on the set parameter, and an operation of determining whether an OFF signal is received.

The virtual cell searcher searches for a Primary Synchronization Signal (PSS) from radio signals received through the virtual antenna, and when a PSS correlation metric becomes greater than a preset threshold, a Physical Broadcast Channel (PBCH) from the radio signals A cyclic redundancy check (CRC) check is performed by searching for , and if it is determined that there is no error as a result of the CRC check, the searched PBCH may be regarded as a synchronization signal and a search response may be transmitted to the searcher scheduler.

The searcher scheduler transmits a plurality of candidate offsets to the virtual cell searcher, and the virtual cell searcher searches for a synchronization signal from radio signals received through the virtual antenna, and each candidate from the searched synchronization signal. Other synchronization signals may be additionally searched for at time points spaced apart by an offset.

The virtual cell searcher may transmit a search response to the searcher scheduler based on a signal having the highest signal strength among the searched synchronization signals.

A wireless communication method according to an embodiment includes at least one physical antenna, and a processor for driving wireless communication software and a radio resource control layer that is an upper layer of the wireless communication software, wherein the wireless communication software includes at least one A searcher bank including virtual hardware, a hardware abstraction layer that virtualizes the at least one physical antenna and the cell searcher to implement as a virtual antenna and a virtual cell searcher in the searcher bank, and a searcher scheduler that controls the virtual antenna and the virtual cell searcher and an interface between the searcher scheduler and the radio resource control layer.

The method includes, by the radio resource control layer, transmitting a cell search request to the searcher scheduler, transmitting, by the searcher scheduler, a cell search request including a frequency number to be searched by the virtual cell searcher, and the virtual cell Searching for a synchronization signal from radio signals of all timings received through the virtual antenna in response to the frequency number by the searcher, and transmitting a search response including synchronization information for the searched synchronization signal to the searcher scheduler may include.

A wireless communication device and a wireless communication method thereof according to embodiments may provide various wireless communication technologies through software driving without depending on hardware.

A wireless communication device and a wireless communication method thereof according to embodiments provide a low-complexity software technology that can be driven through a general-purpose processor, and the terminal can perform wireless communication by switching a mode to a desired wireless communication technology as needed, Enables flexible network operation.

A wireless communication device and a wireless communication method thereof according to embodiments provide a structure of an integrated wireless communication application that implements a cell search operation at a practical level, thereby realizing the commercialization of Software Defined Radio (SDR).

1 is a diagram showing the structure of a wireless communication device according to an embodiment.
2 is a diagram illustrating a structure of wireless communication software according to an embodiment.
3 is a diagram for explaining a communication method using a register interface.
4 is a flowchart illustrating an initial cell search method according to an embodiment.
5 is a flowchart illustrating a cell measurement method according to an embodiment.
6 is a flowchart illustrating a method for storing and managing synchronization information of a searcher scheduler.
7 is a flowchart illustrating two cell search modes of the searcher scheduler.
8 and 9 are timing diagrams for explaining a full search mode and a partial search mode, respectively.
10 illustrates an example of a program code for performing on/off of virtual hardware.
11 is a flowchart illustrating an on/off method of virtual hardware.
12 is a flowchart illustrating an early SSB detection method.
13 is a flowchart illustrating a method for detecting multiple SSBs.
14 is a diagram for explaining a method for detecting multiple SSBs.

In describing the embodiments of the present specification, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description may be omitted.

As used herein, "comprises," "may include." The expression such as indicates the existence of the disclosed corresponding function, operation, component, etc., and does not limit one or more additional functions, operations, components, and the like. Also, in this specification, "includes." Or "have." The term such as is intended to designate that there is a feature, number, step, action, component, part, or combination thereof described in the specification, but one or more other features or number, step, action, component, part or It should be understood that it does not preclude the possibility of the existence or addition of combinations thereof. In this specification, the singular expression includes the plural expression unless the context clearly dictates otherwise.

Hereinafter, embodiments will be described with reference to the accompanying drawings.

1 is a diagram showing the structure of a wireless communication device according to an embodiment.

Referring to FIG. 1 , a wireless communication device 1 includes a wireless hardware platform 110 and wireless communication software 130 .

The wireless hardware platform 110 includes hardware components provided to perform wireless communication. For example, the wireless hardware platform 110 may include a core of a processor and at least one physical antenna.

The wireless communication software 130 is software for supporting a wireless communication technology, and may be driven on a processor that is a part of the wireless hardware platform 110 . The wireless communication software 130 may be, for example, a real time operating system. The wireless communication software 130 may be configured as a program code for performing an operation according to any wireless communication function. For example, the wireless communication software 130 may include program codes for performing a cell searcher function for searching for cells around the wireless communication device 1 . In the following embodiments, embodiments in which the wireless communication device 1 performs a cell search by driving the wireless communication software 130 will be mainly described.

On the processor, a radio resource control layer (hereinafter referred to as an RRC layer) 140 may be further executed as an upper layer of the radio communication software 130 . The RRC layer 140 is a third layer (L3 layer) that controls other layers in relation to configuration, re-configuration, and release of radio bearers. The radio bearer refers to a logical path provided by the layers of the radio communication software 130 for data transfer between the radio communication device 1 and the network. The wireless communication software 130 disposed below the RRC layer 140 may configure the first and second layers (L1 layer, L2 layer). Hereinafter, a more detailed structure of the wireless communication software 130 will be described.

2 is a diagram showing the structure of wireless communication software. Specifically, FIG. 2 shows a software structure when the wireless communication software 130 is implemented as a cell searcher.

Referring to FIG. 2 , the wireless communication software 130 includes a searcher bank 131 , a hardware abstraction layer (HAL) 132 , a searcher scheduler 133 and an RRC layer interface. (134).

The searcher bank 131 is an abstracted virtual medium of the wireless hardware platform 110 and may be implemented independently of hardware. In this embodiment, the searcher bank 131 is virtual hardware for performing a cell search, and may include a virtual antenna (vRF) and a virtual cell searcher (vSRCH). The virtual antenna (vRF) may process and store radio signals received from the wireless hardware platform 110 . The virtual cell searcher vSRCH may search for a cell (eg, a base station cell) using a radio signal stored in the virtual antenna vRF under the control of the searcher scheduler 133 .

The searcher bank 131 may operate as a back-end compiler that compiles program codes for performing a cell search into executable codes of the wireless hardware platform 110 so that the program codes for performing the cell search are actually implemented in the wireless hardware platform 110 . Such virtual hardware may be implemented in the form of a real-time thread. In this case, the operation of the virtual hardware may be defined as a program code in the Thread function() function.

A plurality of searcher banks 131 may be provided in the wireless communication software 130 and may be variably generated according to the number and type of wireless communication technologies to be supported. In this embodiment, one searcher bank 131 may be implemented to search one cell.

When the searcher bank 131 is implemented as virtual hardware, the wireless communication software 130 may include a hardware abstraction layer 132 . The wireless hardware platform 110 may be abstracted through the hardware abstraction layer 132 and implemented as virtual hardware of the searcher bank 131 .

In various embodiments, the hardware abstraction layer 132 may communicate between virtual hardware within the searcher bank 131 and with the virtual hardware of the searcher bank 131 via a register interface. A communication method using the register interface will be described in more detail below with reference to FIG. 3 .

The searcher scheduler 133 may be a set of program codes for performing a cell search function. For example, the searcher scheduler 133 may be executed in a core of a processor in which the wireless communication software 130 is driven, and may be composed of at least one parameter and functions defining a special operation using the parameters.

The code implemented by the searcher scheduler 133 may be configured to perform an operation of processing a request from the RRC layer 140 or transferring feedback on the processing result of the searcher bank 131 to the RRC layer 140 . have. By executing these codes, the searcher scheduler 133 performs a scheduling operation for searching (searching) a peripheral synchronization signal (eg, SSB (Synchronization Signal Block)) within a preset time, and channel configuration. When requested, the searcher bank 131 may be controlled to perform a scheduling operation for tracking the searched synchronization signal, or the search result of the synchronization signal may be transmitted to the RRC layer 140 . If necessary, the searcher scheduler 133 has a data queue, stores the request from the RRC layer 140, and controls the searcher bank 131 to process the request stored in the data queue at the requested time. can

The RRC layer interface 134 is an interface between the wireless communication software 130 and the RRC layer 140 , and transmits a request received from the RRC layer 140 to the searcher scheduler 133 , or receives from the searcher scheduler 133 . data may be transferred to the RRC layer 140 .

3 is a diagram for explaining a communication method using a register interface.

In embodiments, the virtual hardware created in the searcher bank 131 and the hardware abstraction layer 132 may communicate through a register interface. In addition, virtual hardware created in the searcher bank 131 may communicate with each other only through a register interface.

The register interface may include structures of parameters that are defined using processor registers. If parameters are defined using processor registers, they can be accessed more quickly by virtual hardware. The structure of this register interface is a read-only structure (roReg_t) that can be written only by the corresponding virtual hardware, and can be written only from the outside (eg, other virtual hardware and/or hardware abstraction layer 132). It may include a write only structure (woReg_t) and a reaqd&write structure (rwReg_t) that can write both from the virtual hardware and from the outside.

The read-only structure reReg_t of the virtual antenna vRF may include parameters such as, for example, hwStatus defining an operating state of the corresponding virtual antenna vRF, and FreqOffset defining a currently reflected frequency correction value. The write only structure (woReg_t) of the virtual antenna (vRF) is, for example, onoff to command on/off of the corresponding virtual antenna (vRF), SaplingMode to define the sampling frequency, Numerology to define 5G nomerology, and receive center frequency. rxFreq to define, rxBw to define reception bandwidth, freq Offset to define frequency value to be corrected, SyncOffset to define time synchronization value to correct, rxGain to define reception gain, RxMode to define reception state (synchronization state) It may include parameters such as

The read-only structure (reReg_t) of the virtual cell searcher (vSRCH) is, for example, hwStatus, which defines the operating state of the virtual cell searcher (vSRCH), and srchCnt, which defines the number of cells searched by the virtual cell searcher (vSRCH). , and parameters such as srch_report defining additional information on the discovered cell. The write only structure (woReg_t) of the virtual cell searcher (vSRCH) defines, for example, onoff that commands on/off of the corresponding virtual cell searcher (vSRCH), and an operation mode (eg, full search/online search). mode, Numerology defining 5G nomerology, Narfcn defining frequency number, fftSize defining FFT size, Duration defining search time, srchSubframe defining the number of search subframes, and the number of the subcarrier where the search subframe starts Ssb_Foffset to define, Target_NID to define the network id to search, Threshold to define the minimum energy when detecting PSS/SSS, Search_window to define the search range from the start point, Search_offset to define the offset from the start point to the search start point, etc. may include

Hereinafter, a method of performing a cell search of the wireless communication device 1 using the wireless communication software 130 as described above will be described in more detail.

4 is a flowchart illustrating an initial cell search method according to an embodiment.

Referring to FIG. 4 , the RRC layer 140 transmits a cell search request to the searcher scheduler 133 of the wireless communication software 130 . In this case, the cell search request (Cell search req) may include a parameter (narfcn) defining a frequency number to be searched.

The searcher scheduler 133 responds to a cell search request (Cellsearch req), controls the virtual antenna (vRF) in an on state (RF on), and a frequency defined by a frequency number (narfcn) through the virtual antenna (vRF) A synchronization signal can be received within the band. The searcher scheduler 133 may instruct the virtual cell searcher vSRCH to perform a cell search in the full search mode with respect to the requested frequency number narfcn (full srch cmd).

The virtual cell searcher vSRCH may search for neighboring cells by analyzing a radio signal received through the virtual antenna vRF within a frequency band defined by the frequency number narfcn. When a synchronization signal of a corresponding frequency band is received from a neighboring cell, the virtual cell searcher (vSRCH) may store synchronization information of a cell included in the corresponding synchronization signal as a database. In addition, the virtual cell searcher vSRCH may transmit a full search response (full srch rsp) for the discovered cell to the searcher scheduler 133 . The full search response (full srch rsp) is, for example, a time / frequency offset (timing / freq offset), network id (NID), SSB (Synchronization Signal Block) index (SSB index), half frame (half frame), etc. may contain information.

The searcher scheduler 133 may transmit a cell search response (Cell search rsp) to the RRC layer 140 based on a full search response (full srch rsp) from the virtual cell searcher (vSRCH). In this case, the cell search response (Cell search rsp) may include a parameter (narfcn) defining a searched frequency number and a network id (NID) of the searched cell.

The RRC layer 140 selects any one of the discovered cells, establishes a channel for performing wireless communication with the corresponding cell, and after performing synchronization, continuously tracks the corresponding cell while wireless communication is performed. have. To this end, the RRC layer 140 transmits a channel setup request (CH config req) to the searcher scheduler 133 . In this case, the channel setup request (CH conf req) may include a parameter (narfch) defining a frequency number of a channel to be configured and a parameter (NID) defining a network id (NID) of a cell to configure a channel.

The searcher scheduler 133 may use the network id received from the RRC layer 140 to extract pre-stored synchronization information for the corresponding cell. The searcher scheduler 133 transmits a time/freq compensation command (time/freq compensation cmd) to the virtual antenna (vRF) using the extracted synchronization information, and transmits a partial search command (partial srch cmd) to the virtual cell searcher (vSRCH) to send The virtual antenna (vRF) performs time/frequency compensation according to a received time/frequency compensation command (time/freq compensation cmd) to exchange a radio signal synchronized with a corresponding synchronization signal. The virtual cell searcher vSRCH may perform a partial search on a synchronization signal corresponding to information received together with a partial search command (partial srch cmd).

When the virtual cell searcher (vSRCH) completes the search for the corresponding synchronization signal and transmits a partial search response (partial srch rsp) to the searcher scheduler 133, the searcher scheduler 133 sends the virtual cell searcher (vSRCH) to the corresponding synchronization signal and may perform an operation to continuously maintain synchronization with the .

5 is a flowchart illustrating a cell measurement method according to an embodiment.

Referring to FIG. 5 , the RRC layer 140 may perform cell measurement on a cell in which a channel is established and wireless communication is performed. The RRC layer 140 transmits a cell measurement request (Cell meas. req) to the searcher scheduler 133 . In this case, the cell measurement request (Cell meas. req) may include a parameter (narfcn2) defining a frequency number of a cell to be measured and a parameter (NID) defining a network id.

The searcher scheduler 133 verifies the validity of the cell measurement request (Cell meas. req) (that is, whether it is possible to measure the cell), and when it is determined that it is valid, a confirmation response (Cell meas. cnf) to the RRC layer 140 send.

Then, when a measurement timing suitable for cell measurement is reached, the searcher scheduler 133 controls the virtual antenna vRF to be on (RF on), and provides a partial search command to the virtual cell searcher vSRCH (partial). srch cmd). In the partial search command (partial srch cmd), the frequency number to measure the cell (narfcn2, search mode (ie, partial search mode), search range (window), SSB index (SSB index), half frame (half frame), measurement It may include the network id (NID) of the desired cell.

The virtual cell searcher vSRCH may perform a partial search on a synchronization signal corresponding to information received together with a partial search command (partial srch cmd). When the virtual cell searcher (vSRCH) completes the search for the corresponding synchronization signal and transmits a partial search response (partial srch rsp) to the searcher scheduler 133, the searcher scheduler 133 returns the cell measurement result (Cell meas. ind) It may be transmitted to the RRC layer 140 .

If necessary, the virtual cell searcher (vSRCH) may reset a frequency number of the virtual antenna (vRF) to change a frequency and perform cell measurement. When the cell measurement for the corresponding frequency is completed, the virtual antenna (vRF) may be reset to the original frequency.

6 is a flowchart illustrating a method for storing and managing synchronization information of a searcher scheduler.

In an embodiment, the searcher scheduler 133 may store and manage synchronization information of cells obtained through cell search. When a cell search or synchronization is required within a predetermined time, the searcher scheduler 133 may preferentially search a cell using pre-stored synchronization information. This enables faster cell search.

Referring to FIG. 6 , during the initial cell search, the searcher scheduler 133 controls a virtual antenna (vRF) and a virtual cell searcher (vSRCH) to search for a synchronization signal in consideration of the number of all cases. When a neighboring cell is searched, the searcher scheduler 133 may store synchronization information of the searched cell. In this case, the stored synchronization information includes a network id (NID) of the corresponding cell, and a time/frequency offset (timing/frequency offset (frame start)) mapped with the network id (NID), an SSB index, It may include a half frame, a timing drift, and the like.

When any one of the cells searched by the RRC layer 140 is selected and a channel configuration for the selected cell is requested (Channel configuration), the searcher scheduler 133 preferentially performs a partial search based on pre-stored synchronization information. can do. For example, the searcher scheduler 133 may preferentially search around a timing in which a pre-stored SSB exists. Alternatively, the searcher scheduler 133 may first search for a pre-stored network id. Alternatively, the searcher scheduler 133 may perform a cell search by first applying a pre-stored frequency offset.

The operation related to the partial search is the same as that described with reference to FIG. 5 , and a detailed description thereof will be omitted.

7 is a flowchart illustrating two cell search modes of the searcher scheduler. 8 and 9 are timing diagrams for explaining a full search mode and a partial search mode, respectively.

Specifically, FIGS. 7 to 9 show the operation of the above-described full search mode and partial search mode compared to each other.

7 to 9 , in the full search mode, the virtual cell searcher (vSRCH) searches for synchronization signals for all timings of radio signals received through the virtual antenna (vRF). That is, the virtual cell searcher (vSRCH) searches for all possible synchronization signal cases. In the cell search process, the virtual cell searcher (vSRCH) may detect a Primary Synchronization Signal (PSS) to compensate for the frequency. Thereafter, the virtual cell searcher (vSRCH) may search the index for the optimal SSB.

After the cell search, the searcher scheduler 133 may keep the virtual antenna vRF on.

In the partial search mode, the searcher scheduler 133 transmits a time/frequency offset to the virtual antenna (vRF) to compensate for the time and frequency in advance. Then, the virtual cell searcher vSRCH may search for a synchronization signal only around the timing of the candidate group determined by the synchronization information previously stored through the time/frequency corrected virtual antenna vRF. For this partial search, an offset and a window in which the SSB exists may be specified in advance. Alternatively, the virtual cell searcher (vSRCH) may search for a synchronization signal only with respect to a predetermined network id and/or SSB index.

10 illustrates an example of a program code for performing on/off of virtual hardware. 11 is a flowchart illustrating an on/off method of virtual hardware.

In various embodiments, the virtual hardware may be controlled to be in an off state when operation is not required to minimize processor occupancy. Such on/off control may be implemented by executing the program code shown in FIG. 10 . The virtual hardware may be, for example, a virtual antenna (vRF).

Referring to FIG. 10 , a program code for controlling on/off of virtual hardware may include two loops. Two loops can include an outer loop and an inner loop within the outer loop. The loop statement may be, for example, a for statement or a while statement.

The inner loop includes program code that defines a repetitive operation to be performed when the virtual hardware is controlled in an on state. While the inner loop is being executed, the virtual hardware may repeatedly read a register value for real-time configuration for every operation, and may perform an operation by reflecting it.

The outer loop is a basic loop statement to keep a thread persistent, and waits for an on signal while virtual hardware is controlled in an off state. When an ON signal is input to the virtual hardware, the inner loop defined in the outer loop may be executed.

11 illustrates a flowchart in which on/off of the virtual antenna (vRF) is controlled by the searcher scheduler 133 when the virtual hardware is a virtual antenna (vRF).

Referring to FIG. 11 , the virtual antenna vRF may operate in an off state by executing an outer loop (eg, defined as Cond_waint( )) of an on/off control program code. While the virtual antenna (vRF) is controlled in the off state, the virtual antenna (vRF) does not occupy the resources of the processor.

A signal received by the searcher scheduler 133 may be transmitted to the virtual antenna vRF. The on signal may be, for example, a signal in which the value of the onoff parameter is set to 1.

When the on signal is received, the virtual antenna (vRF) can take over the processor and begin operation by executing the inner loop code. When the operation is executed, the virtual antenna (vRF) reads a register value for real-time configuration to set a parameter, and performs a practical operation required for wireless communication based on the set parameter. The virtual antenna vRF may determine whether to control off by checking an onoff parameter whenever an operation is completed.

While the on-state control is maintained, the virtual antenna (vRF) may repeatedly perform the inner loop code as described above. If an off signal is received from the searcher scheduler 133, the virtual antenna vRF executes the outer loop code again to enter the off state.

12 is a flowchart illustrating an early SSB detection method.

In various embodiments, the searcher scheduler 133 may perform early SSB detection as needed. For example, the searcher scheduler 133 may perform early SSB detection when the state of the reception channel is generally good.

When early SSB detection is requested by the searcher scheduler 133, the virtual cell searcher (vSRCH) performs a time shift in a full or partial search process and performs PSS detection for all time intervals. In this case, when the PSS correlation metric is greater than a preset threshold, the virtual cell searcher (vSRCH) detects a Physical Broadcast Channel (SSS/PBCH) instead of searching for PSS. When a PBCH is detected, the virtual cell searcher (vSRCH) decodes the detected PBCH and performs a CRC (Cyclic Redundancy Check) check. search rsp) may be transmitted to the searcher scheduler 133 .

According to the above method, it is possible to reduce the amount of PSS search, which is relatively time-consuming.

13 is a flowchart illustrating a method for detecting multiple SSBs. 14 is a diagram for explaining a method for detecting multiple SSBs.

When there are a plurality of SSBs in the network and an offset between the SSBs is constant, the searcher scheduler 133 may perform multiple SSB detection. Specifically, the searcher scheduler 133 designates a plurality of candidate offset values (offset1, offset2, ... and a window) and transmits them to the virtual cell searcher vSRCH. The virtual cell searcher vSRCH performs an SSB search. do.

When a random SSB is found, the virtual cell searcher (vSRCH) performs SSB discovery at a time point spaced apart by a plurality of candidate offset values (offset1, offset2, ...) from the found SSB. Radio signals (beams) in the cell overlap. When a cell is selected at a point where the virtual cell searcher (vSRCH) is selected, two or more SSBs may be searched for. In this embodiment, the virtual cell searcher (vSRCH) searches for the first SSB at a point where the PSS correlation is maximum. and (FIG. 14(a)), it is possible to search for another SSB at a time spaced apart by a plurality of candidate offset values (offset1, offset2, ...) (FIG. 14(b)).

In one embodiment, when radio signals within a cell move, the virtual cell searcher (vSRCH) monitors a cell found by measuring the cell, and tracks the cell by a plurality of candidate offset values (offset1, offset2, ...) Another SSB is searched for at a time spaced apart (Fig. 14(c)), In this case, if the signal strength of the additionally discovered SSB is greater than the signal strength of the first SSB, the virtual cell searcher (vSRCH) selects the additionally discovered SSB. SSB search can be performed while tracking new.

As a result of the CRC check for the discovered SSBs, if it is determined that there is no error, the virtual cell searcher (vSRCH) sets one SSB with the best channel state among the SSBs (eg, Reference Signal Received Power (RSRP) with the largest SSB) may be determined as the final search result.

Those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present specification and drawings are merely provided for specific examples to easily explain the contents of the present invention and help understanding, and are not intended to limit the scope of the present invention. Therefore, the scope of the present invention should be construed as including all changes or modifications derived based on the technical spirit of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

1: wireless communication device
110: wireless hardware platform
120: wireless platform driver
130: wireless communication software

Claims (15)

at least one physical antenna; and
A processor for driving a radio communication software and a radio resource control layer that is an upper layer of the radio communication software,
The wireless communication software,
a searcher bank comprising at least one virtual hardware;
a hardware abstraction layer that virtualizes the at least one physical antenna and the cell searcher and implements it as a virtual antenna and a virtual cell searcher in the searcher bank;
a searcher scheduler controlling the virtual antenna and the virtual cell searcher; and
An interface between the searcher scheduler and the radio resource control layer,
The virtual cell searcher,
One or more are variably generated according to the number and type of wireless communication technologies to be supported,
Communication between the virtual hardware and between the virtual hardware and the hardware abstraction layer is performed through a register interface,
The register interface includes a read-only structure (roReg_t) that can be written only from the corresponding virtual hardware, a write-only structure (woReg_t) that can be written only from the outside, and a write-only structure that can be written from both the virtual hardware and the outside. contains a read&write structure (rwReg_t),
The virtual antenna and the virtual cell searcher,
Reading the register values for real-time setting defined in the structures, setting parameters necessary for cell search and performing cell search,
The searcher scheduler,
When a cell search request for initial cell search is received from the radio resource control layer, an onoff parameter of the write only structure (woReg_t) of the virtual antenna is set to control the virtual antenna in an on state, and By setting a Narfcn parameter defining a frequency number of the write only structure (woReg_t), the wireless communication device controls the virtual cell searcher to perform a full cell search of a frequency number to be searched. delete delete According to claim 1, wherein the virtual cell searcher,
A wireless communication device that searches for a synchronization signal from radio signals of all timings received through the virtual antenna and transmits a search response including synchronization information for the searched synchronization signal to the searcher scheduler. The method of claim 4, wherein the searcher scheduler,
The synchronization information received from the virtual cell searcher is stored in a database, and when a channel establishment request for a specific synchronization signal is received from the radio resource control layer, the synchronization information of the specific synchronization signal is extracted from the database and a partial and controlling the virtual antenna and the virtual cell searcher to perform a cell search. According to claim 5, wherein the searcher scheduler,
Control the virtual antenna to compensate the time/frequency of the virtual antenna based on the time/frequency offset of the extracted synchronization information, and a cell network id, window, and SSB (Synchronization Signal Block) index of the extracted synchronization information; A wireless communication device for controlling the virtual cell searcher to search for a corresponding synchronization signal based on at least one of a half frame and a frequency number. According to claim 6, The virtual cell searcher,
and searching for the synchronization signal with priority around the time offset when performing the partial cell search. According to claim 1, wherein the searcher scheduler,
When a cell measurement request for a specific synchronization signal is received from the radio resource control layer, an acknowledgment is transmitted to the radio resource control layer and when a cell measurement is possible, the virtual antenna is controlled in an on state, , for controlling the virtual cell searcher to perform a partial cell search of the specific synchronization signal requested for cell measurement. According to claim 1, wherein the wireless communication software,
A program code for controlling on/off of the virtual hardware,
The program code is
an external loop defining an operation of monitoring an on signal in an off state of the virtual hardware; and
and an inner loop disposed within the outer loop and defining a repeat operation performed in an on state of the virtual hardware when the on signal is received. 10. The method of claim 9, wherein the inner loop,
An operation of reading the real-time setting register value to set a parameter necessary for the cell search, an operation of performing the cell search based on the set parameter, and an operation of determining whether an OFF signal is received, wireless communication Device. According to claim 1, wherein the virtual cell searcher,
PSS (Primary Synchronization Signal) is searched from the wireless signals received through the virtual antenna, and when the PSS correlation metric is greater than a preset threshold, a PBCH (Physical Broadcast Channel) is searched from the wireless signals, and CRC (Cyclic Redundancy Check), and when it is determined that there is no error as a result of the CRC check, the searched PBCH is regarded as a synchronization signal and a search response is transmitted to the searcher scheduler. According to claim 1, wherein the searcher scheduler,
sending a plurality of candidate offsets to the virtual cell searcher;
The virtual cell searcher,
Searching for a synchronization signal from radio signals received through the virtual antenna, and further searching for other synchronization signals at time points spaced apart from the searched synchronization signal by each candidate offset. The method of claim 12, wherein the virtual cell searcher,
A wireless communication device for transmitting a search response to the searcher scheduler based on a signal having the highest signal strength among the searched synchronization signals. A processor for driving at least one physical antenna, and a radio communication software and a radio resource control layer that is an upper layer of the radio communication software, wherein the radio communication software comprises: a searcher bank including at least one virtual hardware; A hardware abstraction layer that virtualizes one physical antenna and a cell searcher and implements it as a virtual antenna and a virtual cell searcher in the searcher bank, a searcher scheduler that controls the virtual antenna and the virtual cell searcher, and the searcher scheduler and the radio resource control Including an interface between layers, wherein the virtual cell searcher is a wireless communication method of a wireless communication device in which one or more is variably generated according to the number and type of wireless communication technology to be supported,
transmitting, by the radio resource control layer, a cell search request to the searcher scheduler;
transmitting, by the searcher scheduler, a cell search request including a frequency number to be searched for to the virtual cell searcher; and
The virtual cell searcher searches for a synchronization signal from radio signals of all timings received through the virtual antenna in response to the frequency number, and sends a search response including synchronization information for the searched synchronization signal to the searcher scheduler comprising the step of sending
Communication between the virtual hardware and between the virtual hardware and the hardware abstraction layer is performed through a register interface,
The register interface includes a read-only structure (roReg_t) that can be written only from the corresponding virtual hardware, a write-only structure (woReg_t) that can be written only from the outside, and a write-only structure that can be written from both the virtual hardware and the outside. contains a read&write structure (rwReg_t),
The virtual antenna and the virtual cell searcher,
Reading the register values for real-time setting defined in the structures, setting parameters necessary for cell search and performing cell search,
The searcher scheduler,
When a cell search request for initial cell search is received from the radio resource control layer, an onoff parameter of the write only structure (woReg_t) of the virtual antenna is set to control the virtual antenna in an on state, and A method of controlling the virtual cell searcher to perform a full cell search of a frequency number to be searched by setting a Narfcn parameter defining a frequency number of the write only structure (woReg_t). delete

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