JP2019075692A - Evaluation device of radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately evaluate the communication performance of a next-generation wireless communication system such as a 5G system. An evaluation device 10 for a wireless communication system may include an input unit 1005, a processing unit 1001, and an output unit 1006. In the input unit 1005, parameters for setting a plurality of candidate beam patterns for dynamic beam forming are input. The processing unit 1001 calculates the beam gain when one of the plurality of candidate beam patterns is selectively applied to at least one of the two locations in the system model, and the communication performance between the two locations is calculated based on the beam gain. The process of generating information about the communication performance and associating the information about the communication performance with at least one of the two locations is performed for each different combination candidate of the two locations set in the system model. The output unit 1006 outputs information regarding communication performance associated with the processing unit 1001. [Selection diagram] FIG. 8

Description

  The present invention relates to an evaluation device of a wireless communication system.

  In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) has been specified for the purpose of further high data rates, low delays, etc. (Non-Patent Document 1). Moreover, the successor system of LTE is also considered for the purpose of the further broadbandization and speeding-up from LTE. As successor systems of LTE, for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (5G plus), New-RAT (Radio Access Technology), etc. There is something called.

  In next-generation mobile communication systems (for example, 5G systems), in order to further speed up signal transmission and reduce interference, a large number of antenna elements (for example, 100 elements or more) in high frequency bands (for example, 5 GHz or more) It is considered to perform BF (beamforming) and dynamic BF using Massive (Multiple Input Multiple Output) technology to be used.

  Moreover, in the next-generation mobile communication system, utilization of a frequency band higher than the frequency band used by previous generation systems such as LTE and LTE-A is being studied. For example, it is also considered to perform BF (hereinafter, may be referred to as “high frequency band BF” for convenience) in a frequency band higher than the frequency band used by the previous generation system.

  Furthermore, in the next-generation mobile communication system, application of a technology called dynamic TDD (dynamic Time Division Duplex) is also considered. In dynamic TDD, the configuration (UL-DL configuration) of uplink (UL) subframes and downlink (DL) subframes may change dynamically.

3GPP TS 36.300 v14.3.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 14),” June 2017 3GPP TS 36.211 v14.2.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 14),” March 2017 3GPP TS 36.213 v14.2.0, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 14),” March 2017 3GPP TR 37.840 V12.1.0, “Study of Radio Frequency (RF) and Electromagnetic Compatibility (EMC) requirements for Active Antenna Array System (AAS) base station (Release 12),” December 2013 3GPP TR 37.842 V13.2.0, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Universal Terrestrial Radio Access (UTRA; Radio Frequency (RF)) requirement background for Active Antenna System (AAS) Base Station (BS) (Release 13), ”March 2017

  As mentioned above, it is considered to apply new technology or features such as Massive MIMO technology, high frequency band BF, and / or dynamic TDD to the next generation wireless communication system such as 5G system. ing. However, in consideration of such newly applied features or techniques, it has not yet been considered to evaluate the communication performance of the wireless communication system.

  An aspect of the present invention aims to enable appropriate evaluation of communication performance of a next-generation wireless communication system such as a 5G system, taking into consideration newly applied features or techniques. One.

  According to an aspect of the present invention, an evaluation apparatus of a wireless communication system includes: an input unit to which parameters for setting a plurality of candidate beam patterns of dynamic beam forming applied to a system model simulating the wireless communication system are input; A beam gain when one of the plurality of candidate beam patterns is selectively applied to at least one of the first place and the second place in the system model is calculated based on the parameter, and the beam gain is calculated. Processing for generating information on communication performance between the first place and the second place, and associating the information on the communication performance with at least one of the first place and the second place, Performed for each different combination candidate of the first place and the second place set in the system model Comprising a processing section, wherein associated with each combination candidates in at least one of the first location and the second location, and an output unit that outputs information on the communication performance.

  According to an aspect of the present invention, communication performance of a next-generation wireless communication system such as a 5G system can be appropriately evaluated.

It is a figure which shows typically the structural example of the radio | wireless communications system which the radio | wireless communications system evaluation apparatus which concerns on one Embodiment makes object of evaluation or simulation. It is a schematic diagram for demonstrating that dynamic cell selection and beam selection and switching are performed in the 5G system which concerns on one Embodiment. It is a figure which shows the example of a sub-frame structure by dynamic TDD applied to 5G system which concerns on one Embodiment. It is a schematic diagram for demonstrating that the interference between UL-DL communication can change dynamically in the 5G system which concerns on one Embodiment. It is a schematic diagram which shows an example of the array antenna of the Massive MIMO technique applied to 5G system which concerns on one Embodiment. It is a schematic diagram for demonstrating an example of the beam forming gain obtained by the array antenna with a smaller number of antenna elements than the array antenna of the Massive MIMO technique illustrated in FIG. FIG. 7 is a schematic diagram for explaining an example of beamforming gain obtained by the array antenna of the Massive MIMO technology illustrated in FIG. 5 in comparison with FIG. 6A. It is a schematic diagram which shows the example of a display of the communication performance area map obtained by the radio | wireless communications system (5G system) evaluation apparatus which concerns on one Embodiment. It is a block diagram showing the example of hardware constitutions of the 5G system evaluation system concerning one embodiment. It is a block diagram showing an example of functional composition of a 5G system evaluation system concerning one embodiment. It is a block diagram which shows the functional structural example of the link budget calculation part illustrated in FIG. It is a schematic diagram for demonstrating the definition of the horizontal direction of the beam in the beamforming which concerns on one Embodiment, and the orthogonal | vertical direction. It is a figure which shows the example of a display of the user interface (UI) used for the input of the BF parameter with respect to 5G system evaluation apparatus which concerns on one Embodiment. It is a figure which shows an example of the beam pattern set in 5G system evaluation apparatus which concerns on one Embodiment. It is a flowchart which shows the operation example of the beam gain calculation part illustrated in FIG. It is a figure which shows the table described in 5.3.3.3.1 of a nonpatent literature 5 section. It is a figure which shows the table described in 5.3.3.3.2 of a nonpatent literature 5.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view schematically showing a configuration example of a wireless communication system to be evaluated or simulated by the wireless communication system evaluation device according to an embodiment. The wireless communication system 1 shown in FIG. 1 may be regarded as a system reproduced in a virtual space simulating a real space in the evaluation or simulation by the wireless communication system evaluation device.

  A system reproduced in a virtual space for evaluation (or simulation) may be conveniently referred to as an "evaluation system model". Therefore, the wireless communication system 1 illustrated in FIG. 1 may be referred to as an evaluation system model 1.

  The evaluation system model 1 may be, for example, a system model of a 5G system (hereinafter abbreviated as “5G system model”), and one or more base stations (BSs) 2 may be provided. In FIG. 1, four base stations 2 are arranged in the 5G system model 1 as a non-limiting example.

  The apparatus for evaluating or simulating the 5G system model 1 may be conveniently referred to as a “5G system evaluation apparatus”, a “5G system evaluation tool”, a “5G system simulator”, or the like.

  In the 5G system model 1, the base station 2 forms or provides a wireless communication area 200. The “wireless communication area” includes “cell”, “cell area”, “sector”, “sector area”, “coverage area”, “cover area”, “wireless area”, “communication area”, “service area”, It may be called "cluster area" or the like. In the example of FIG. 1, three cells 200 are focused on.

  In the 5G system model 1, the cells 200 may be partitioned into multiple mesh (MS) areas, as schematically illustrated in FIG. The area divided into MS areas may be the entire 5G system model 1 including the cell 200, or may be limited to a partial area to be evaluated in the 5G system model 1.

  In the 5G system model 1, for example, the base station 2 is arranged in any one or more of a plurality of MS areas. Moreover, a user terminal (UE: User Equipment) may be located in the unit of MS area in one or several MS areas where the base station 2 is not arrange | positioned among several MS areas. In other words, the base station 2 may be virtually arranged in any one of the plurality of MS areas, and the UE may be virtually arranged in any one of the plurality of MS areas.

  The allocated MS area of the base station 2 is an example of the “first place” in the 5G system model 1, and the allocated MS area of the UE is an example of the “second place” in the 5G system model 1. is there. However, conversely, the MS area in which the UE is deployed may correspond to the “first place”, and the MS area in which the base station 2 is deployed may correspond to the “second place”.

  In the 5G system model 1, the 5G system evaluation device 10 (see FIG. 8) can obtain information on the communication performance between any of the base stations 2 and the UE by simulation and use it for evaluation. In addition, about the structural example of 5 G system evaluation apparatus 10, it mentions later using FIGS. 8-10.

  The information on the communication performance may include, as a non-limiting example, at least one of communication performance indicators such as received power, Signal-to-Interference Noise Ratio (SINR), and throughput. The communication performance indicator may be an indicator for either the downlink (DL) or the uplink (UL). For example, received power, SINR, and throughput may all be values for DL or UL.

  All or part of the base station 2 illustrated in FIG. 1 may have a configuration for performing beamforming (BF) using an array antenna of Massive MIMO technology, for example. The example of FIG. 1 schematically shows how three base stations 2 perform BF.

  In the 5G system model 1, in the MS area in which the base station 2 and the UE are not disposed, an object simulating a building, a vehicle, or a person may be appropriately disposed. A building, a vehicle, or a person may be a shield or reflector of radio waves in wireless communication. An object that can be a shield or a reflector of radio waves may be arranged according to the real space in the evaluation system model 1 based on real map information or the like, or may be freely selected without depending on the real space. It may be set.

  By the way, in the 5G system, as described above, the use of a frequency band higher than the frequency band used by previous generation systems such as LTE and LTE-A has been considered. In addition, in 5G systems, in addition to dynamic BF based on Massive MIMO technology, application of features or technologies not found in previous generation systems, such as dynamic TDD, is also being considered.

  For example, in the 5G system, dynamic cell selection by the UE based on the information indicating the radio wave propagation environment, and dynamic beam selection and switching in the dynamic BS and / or the BF of the MS may occur (see FIG. 2). .

  In response to dynamic cell selection and dynamic beam switching, indicators of communication performance (which may be referred to as “communication quality”) such as received power, SINR or throughput may change locally. In addition, the indicator of communication performance may change temporally and locally depending on the dynamic beam switching of BF in neighboring cells.

  Also, in 5G systems, DL and UL communications may be switched dynamically in the time domain, for example, by application of dynamic TDD. In dynamic TDD, for example, as shown in FIG. 3, the configuration (UL-DL configuration) of UL subframes and DL subframes changes dynamically.

  As a result, the influence of radio interference on communication of UL and / or DL may temporally change between a certain cell and a neighbor cell. For example, as schematically shown in FIG. 4, the UL communication of a certain cell #A may interfere with the DL communication of a neighboring cell #B. Also, the UL communication of the neighboring cell #A may interfere with the DL communication of the cell #B.

  Although not shown in FIG. 4, an aspect in which the UL communication of the neighboring cell #B interferes with the DL communication of the cell #A, and an aspect in which the DL communication of the neighboring cell #A interferes with the UL communication of the cell #B. Also exist.

  In dynamic TDD, since the interference between these UL-DL communications may change dynamically in time, the communication performance indicator in a certain target cell may change in time. In addition, the time change of the radio wave interference in a certain cell may be produced, for example, by the movement of a shield or reflector of movable radio waves in the cell and / or a neighboring cell.

  In addition, in the 5G system, for example, small cells with smaller coverage than the macro cell may be placed at the hot spot in the macro cell for the purpose of traffic offloading of the hot spot. It is considered to assign a higher frequency band (for example, 5 GHz or more) to the small cell than the macro cell.

  In a small cell of a frequency band higher than a macro cell, BF may be performed using an array antenna (see the schematic diagram of FIG. 5) having a large number of antenna elements (for example, 100 elements or more) as in Massive MIMO technology.

  When performing BF in a high frequency band using an array antenna of Massive MIMO technology, more antenna elements can be arranged in the same antenna length (or area) compared to a low frequency band, and the number of antenna elements is smaller A beam having sharp directivity and high gain can be formed in a specific direction (see FIG. 6B), as compared to the array antenna of FIG. 6A (see FIG. 6A).

6A and 6B, L represents the array length of the antenna elements, λ represents the wavelength of radio waves, λ / 2 represents the antenna element spacing, and φ _min represents the beam width. In the comparative example of FIG. 6A and FIG. 6B, about 10 times BF gain is obtained by BF using the array antenna of Massive MIMO technology compared with the example of FIG. 6B.

  Therefore, the high frequency band BF can extend the coverage of the small cell. On the other hand, due to the sharp radio wave directivity which is the radio wave characteristic of the high frequency band, it is easily influenced by the shield or the reflector, and the radio wave propagation characteristic is easily changed (for example, deteriorated). Therefore, in response to the movement of the shield or reflector such as a vehicle or a person, the communication performance index in a certain target cell is likely to change temporally and / or locally.

  As described above, in 5G systems, local and / or temporal changes in communication performance indicators such as received power, SINR, or throughput may occur due to features or technologies that are not present in previous-generation systems such as LTE. In other words, an area map (sometimes referred to as a "communication performance area map" for convenience) indicating the distribution of communication performance in the service area of the 5G system may change locally and / or temporally.

  Therefore, in the present embodiment, the 5G system evaluation device 10 appropriately or appropriately changes the locational and / or temporal change of the communication performance area map caused by one or more features or technologies specific to the 5G system. Make it possible to evaluate. Note that the evaluation may include evaluating the flutter of change.

Hereinafter, an outline of processing by the 5G system evaluation device 10 will be described.
For example, the 5G system evaluation device 10 may be abbreviated as a service area ("cover area") that can be covered by one or more BSs in the 5G system model 1 according to the arrangement of one or more BSs. ) May be determined. The cover area includes one or more MS areas. When determining the coverage area, the difference in gain according to the presence or absence of BF for each BS may be used.

  When the coverage area is determined, the 5G system evaluation device 10 may determine, for example, which MS area is connected to which BS in the coverage area (in other words, the connection destination BS of the focused MS area). For example, since the best or preferred beam among selectable candidate beams may be different for each MS area, the connection destination BS may also be different for each MS area.

  Once the connection destination BS is determined, the 5G system evaluation device 10 can determine a BS (which may be abbreviated as “interference BS”) that can be an interference source for the MS area where the connection destination BS is the serving BS. . For convenience, the serving BS may be described as "BS (s)" and the interfering BS may be described as "BS (i)".

  When the BS (s) and BS (i) for the MS area are determined, the 5G system evaluation device 10 obtains information on the communication performance of one or both of DL and UL for the pair of MS area and BS (s). You may calculate it.

  When calculating information related to communication performance, for example, changes in beam switching and / or other-cell interference (due to beam switching, DL / UL / OFF switching, etc.) in a certain cell may be taken into consideration. For example, the presence or absence of dynamic BF may be considered for BS (s), and the presence or absence of dynamic BF on the BS side and / or MS side for BS (i). Note that the presence or absence of BF on the MS side regarding BS (i) may be regarded as the presence or absence of dynamic BF in a UE located in another MS area where BS (i) is BS (s). Also, when calculating information related to communication performance, when BS (i) performs DL transmission, when performing UL reception, when not communicating (OFF), DL transmission, UL reception, and according to dynamic TDD, Each of the cases of dynamically switching no communication may be considered. Furthermore, in the calculation of the information related to the communication performance, for example, a change in the propagation environment or the like depending on the presence or absence of the shield or the reflector may be taken into consideration. Parameters relating to the propagation environment and the like according to the presence or absence of the shield or the reflector may be input to the 5G system evaluation apparatus 10 as a predetermined value, for example.

  According to the calculation of the information related to the communication performance, the 5G system evaluation device 10 may generate a communication performance area map which is an example of the evaluation result of the 5G system, for example, and output the communication performance area map to an external device and / or communication network.

  The output destination of the communication performance area map may be, for example, a display provided in the 5G system evaluation device 10 or a display of another device connected to the 5G system evaluation device 10 via a communication network. May be

  In addition, the display on which the communication performance area map is displayed is, exemplarily, a portable telephone (including a smart phone) possessed by a user of the 5G system evaluation apparatus 10 (which may be called an “operator”) or a tablet terminal. It may be a display.

  FIG. 7 schematically shows a display example of the communication performance area map. The example of FIG. 7 is an example in which in the communication performance area map, high and low of communication performance, which is an example of the evaluation result, is displayed by color-coding in units of MS areas. In FIG. 7, color classification is expressed by the difference in hatching.

  However, the level of communication performance may be represented by the change in lightness, saturation or shade of the same color. However, the high and low of the communication performance may be displayed in such a manner that the operator of the 5G system evaluation device 10 can distinguish. For example, high and low communication performance may be represented by numerical values instead of or in addition to color coding. Also, the communication performance area map may be represented in a three-dimensional format as well as the two-dimensional format. For example, the level of communication performance may be represented by a graph such as a two-dimensional or three-dimensional bar graph for each MS area instead of or in addition to color coding.

  The output destination of the communication performance area map is not limited to the display, and may be, for example, a projector or a printer. The communication performance area map may be output and presented in a manner that is visible to the operator of the 5G system evaluation device 10.

(Example of configuration of 5G system evaluation device)
Next, a configuration example of the 5G system evaluation device 10 described above will be described with reference to FIGS. FIG. 8 is a block diagram showing an example of the hardware configuration of the 5G system evaluation device 10 according to one embodiment, and FIG. 9 is a functional block diagram of the 5G system evaluation device 10 according to one embodiment. FIG. 10 is a block diagram showing an example of a functional configuration of the link budget calculation unit 31 illustrated in FIG.

  The 5G system evaluation apparatus 10 may be configured by, for example, a computer such as a personal computer (PC) or a server computer. A computer is an example of an information processing apparatus.

  The 5G system evaluation device 10 may be configured by one computer or may be configured by a plurality of computers. The load distribution of the process performed by the evaluation device 10 may be achieved by a plurality of computers.

  As shown in FIG. 8, the 5G system evaluation device 10 may include, for example, a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

  In the following description, the term "device" can be read as a circuit, a device, or a unit. The hardware configuration of the evaluation device 10 may be configured to include one or more devices illustrated in FIG. 8 or may be configured without some devices.

  For example, although only one processor 1001 is illustrated in FIG. 8, a plurality of processors may be provided in the 5G system evaluation device 10. Also, the processing in the 5G system evaluation device 10 may be executed by one processor 1001 or may be executed by a plurality of processors. In one or more processors, multiple processes may be performed simultaneously, in parallel, sequentially, or in other manners. The processor 1001 may be a single core processor or a multi-core processor. The processor 1001 may be implemented using one or more chips.

  One or more functions of the 5G system evaluation device 10 are realized by, for example, causing hardware such as the processor 1001 and the memory 1002 to read predetermined software. The "software" may be referred to as a "program", an "application" or a "software module".

  For example, the processor 1001 reads and executes a program by controlling one or both of reading and writing of data stored in one or both of the memory 1002 and the storage 1003. The program may be transmitted from the network by communication by the communication device 1004 via a telecommunication line.

  The program may be a program that causes a computer to execute all or part of the processing in the 5G system evaluation device 10. In response to the execution of the program code included in the program, one or more functions of the 5G system evaluation device 10 are realized. All or part of the program code may be stored in the memory 1002 or the storage 1003 or may be described as part of an operating system (OS).

  For example, the program may include program code that embodies functional blocks described later with reference to FIGS. 9 and 10, and may also include program code that executes a flowchart described later with FIG. A program containing such program code may be referred to as an "evaluation program".

  The processor 1001 is an example of a processing unit, and operates the OS, for example, to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

  The processor 1001 also reads, for example, one or both of a program and data from one or both of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processing according to these.

  The memory 1002 is an example of a computer-readable recording medium, and may be configured using, for example, at least one of a ROM, an EPROM, an EEPROM, a RAM, an SSD, and the like. Note that "ROM" is an abbreviation for "Read Only Memory", and "EPROM" is an abbreviation for "Erasable Programmable ROM". “EEPROM” is an abbreviation of “Electrically Erasable Programmable ROM”, “RAM” is an abbreviation of “Random Access Memory”, and “SSD” is an abbreviation of “Solid State Drive”.

  The memory 1002 may be called a register, a cache, a main memory, a work memory, a main storage device, or the like. The memory 1002 stores a program that can be executed to implement the 5G system evaluation device 10 according to an embodiment of the present invention.

  The storage 1003 is an example of a computer-readable recording medium, and is an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive (HDD), a flexible disk, a magnetooptical disk (for example, a compact disk, a digital versatile disk, It may be configured using at least one of Blu-ray (registered trademark) disc, smart card, flash memory (for example, card, stick, key drive), flexible disc, magnetic strip, and the like. The storage 1003 may be called an auxiliary storage device. The above-described storage medium may be, for example, a database including one or both of the memory 1002 and the storage 1003, a server, or any other suitable medium.

  The communication device 1004 is an example of hardware (may be referred to as “transmission / reception device”) for performing communication between computers via one or both of a wired network and a wireless network. The “communication apparatus” may be called, for example, a network device, a network controller, a network card, a communication module, and the like.

  The input device 1005 is an example of an input device that receives an input from the outside of the 5G system evaluation device 10. Illustratively, one or more of a keyboard, mouse, microphone, switch, button, sensor may be included in the input device 1005.

  The output device 1006 is an example of an output device that implements output to the outside of the 5G system evaluation device 10. Illustratively, one or more of a display, speakers, LED lamps, etc. may be included in the output device 1006.

  Note that the input device 1005 and the output device 1006 may have individual configurations, or may have an integral configuration such as a touch panel.

  Also, each device such as the processor 1001 and the memory 1002 may be communicably connected by a bus 1007. The devices may be connected by a single bus 1007 or may be connected by using different buses.

  The 5G system evaluation device 10 may be configured to include hardware such as a microprocessor, a DSP, an ASIC, a PLD, and an FPGA. For example, processor 1001 may be implemented in at least one of these hardware. The hardware may realize part or all of each functional block described later in FIGS. 9 and 10.

  Note that “DSP” is an abbreviation of “Digital Signal Processor”, and “ASIC” is an abbreviation of “Application Specific Integrated Circuit”. “PLD” is an abbreviation of “Programmable Logic Device”, and “FPGA” is an abbreviation of “Field Programmable Gate Array”.

(Example of functional configuration of 5G system evaluation device)
Next, a functional configuration example of the 5G system evaluation device 10 will be described with reference to FIG. As illustrated in FIG. 9, the 5G system evaluation device 10 may include, for example, a link budget calculation unit 31, a cover area determination unit 32, an interference calculation unit 33, and an area evaluation unit 34.

  The link budget calculation unit 31 exemplarily selectively applies one of the plurality of candidate beam patterns in the 5G system model 1, and calculates the beam gain based on the corresponding BF parameter. Also, the link budget calculation unit 31 calculates information (for example, link budget) on the communication performance between the MS area to which the candidate beam pattern is applied and the connection destination BS based on the calculated beam gain. Note that a configuration example of the link budget calculation unit 31 will be described later.

  The process of calculating beam gain by selectively applying one of the candidate beam patterns and the process of calculating information related to communication performance based on the calculated beam gain are different pairs of MS areas in the 5G system model 1 May be done on a unit basis. Also, the communication performance when dynamic BF is applied is calculated by the beam gain of the candidate beam with the largest communication performance among the plurality of candidate beam patterns.

  For example, the BS is placed in one of the different MS area pairs, and the UE is placed in the other. Therefore, the calculation process of the beam gain and the calculation process of the information related to the communication performance described above are performed for each of a plurality of pairs (in other words, combination candidates) that the BS and UE arranged in the 5G system model 1 can take. Good.

  The calculation of the information regarding the communication performance may include, for example, calculating at least one of the reception power, the SINR, and the throughput based on the beam gain. The beam gain may be separately calculated and synthesized separately for the horizontal component and the vertical component of the candidate beam pattern (hereinafter sometimes referred to as “candidate beam”) as described later.

  The plurality of candidate beam patterns are set by parameters (may be referred to as "BF parameters") such as the number of antenna elements in the array antenna model, antenna element spacing, beam direction, beam range, and beam spacing, for example. You may The BF parameters may be one or both of a parameter for the MS area in which the BS is located and a parameter for the MS area in which the UE is located.

  The BF parameters may be input to the processor 1001 in which the link budget calculation unit 31 is embodied, for example, through the input device 1005 and / or the communication device 1004 illustrated in FIG. 8. Also, the BF parameters may be stored in the memory 1002 and / or the storage 1003. The memory 1002 and / or the storage 1003 may store information or data for generating the 5G system model 1.

  At least one of the input device 1005 and the communication device 1004 may be regarded as an example of an input unit to which BF parameters are input. When the BF parameters stored in the memory 1002 and / or the storage 1003 are read by the processor 1001, the memory 1002 and / or the storage 1003 may be regarded as an example of an input unit to which the BF parameters are input. The “input unit” may be paraphrased as a “reception unit” that receives the BF parameter.

  The cover area determination unit 32 exemplarily determines an MS area (which may be referred to as a cover area) covered by the connection destination BS by determining a connection destination BS for each of the MS areas. The coverage area may be determined for one or both of the case of “with dynamic BF” and the case of “without dynamic BF”. In the case of “with dynamic BF”, it relates to the communication performance with a plurality of BSs (a plurality of candidate beam patterns is applied to each BS and MS area pair) using the beam gain calculated by the link budget calculation unit 31. Among the multiple BSs (where multiple candidate beam patterns are applied to each BS and MS area pair), the MS area belongs to the coverage area of the BS with the highest communication performance among the multiple BSs (for example, received power). You may decide to

  The interference calculation unit 33 exemplarily calculates, in the 5G system model 1, interference from neighboring interference BSs (i) with respect to the coverage area of a certain BS (s). The calculation of interference is performed, for example, by switching the communication of BS (i) to any of DL communication, UL communication, and OFF for DL communication and / or UL communication of BS (s). Good.

  The switching of communication of the BS (i) may be performed, for example, according to a pattern based on the configuration (UL-DL configuration) of the UL subframe and the DL subframe in dynamic TDD illustrated in FIG. Note that switching of communication by dynamic BF in BS (i) may be performed by switching the location of MS (i) to be communicated, or without designating MS (i) in BS (i). It may be done by switching candidate beams in BS (i) randomly (eg, using random numbers). In the case of BS (i) and MS (i) with dynamic BF, the beam gain of the candidate beam that maximizes the communication performance between BS (i) and MS (i) among a plurality of candidate beam patterns is applied.

  The area evaluation unit 34 exemplarily evaluates at least one of time change, location change, and an index indicating the degree of flapping of each MS area in the communication performance area map, and the evaluation result is displayed, for example, through the output device 1006. Output to The output device 1006 is an example of an output unit that outputs information or data.

  In addition, as described above, the functions of the respective units 31 to 34 are embodied as being realized by the processor 1001 reading a program stored in the memory 1002 and / or the storage 1003 and executing the program. Good. In addition, the functions of the units 31 to 34 may not be all included in the 5G system evaluation device 10, and some of the functions may be optional.

  Hereinafter, the link budget calculation unit 31, which is one of the characteristic configurations of the 5G system evaluation device 10 in the present embodiment, will be further described.

(Link budget calculation unit)
FIG. 10 is a functional block diagram of the link budget calculation unit 31. As shown in FIG. As shown in FIG. 10, the link budget calculation unit 31 may include, for example, a beam gain calculation unit 311, a beam search unit 312, and a communication performance calculation unit 313.

  The beam gain calculation unit 311 is an example of a first calculation unit, and illustratively calculates beam gains for each of a plurality of candidate beams. The calculation of the beam gain may include calculating and combining (e.g., multiplying) the beam gains separately for the horizontal direction and the vertical direction of the candidate beam.

  Here, as schematically illustrated in FIG. 11, the horizontal direction of the candidate beam can be represented by an angle φ based on the x axis in the xyz coordinate system, and the vertical direction of the candidate beam is the xyz coordinate system. Can be represented by an angle θ based on the z axis in In FIG. 11, Δx represents the antenna element interval in the horizontal direction, and Δz represents the antenna element interval in the vertical direction.

The candidate beams are illustratively set by the parameters shown in Table 1 for each of the horizontal and vertical directions.

The total number N _T of antenna elements of the array antenna used for BF is N _T = N _Tx × N _Tz . The BF parameter can be set by the operator performing an input operation on the 5G system evaluation apparatus 10 using a user interface (UI) as shown in FIG. 12 as a non-limiting example.

  For example, in a state where the UI illustrated in FIG. 12 is output to the output device 1006 (for example, a display), the operator of the 5G system evaluation apparatus 10 inputs a setting value to each setting item of the UI. By the input, the set value of the BF parameter is input to the processor 1001 (for example, the beam gain calculation unit 311) through the input device 1005. The set values of the BF parameters may be stored in the memory 1002 and / or the storage 1003.

  The set value of the BF parameter may be prepared in a plurality of patterns corresponding to a plurality of beam patterns. The setting values of the BF parameters may be stored in the memory 1002 and / or the storage 1003 in the form of, for example, a setting file.

  The processor 1001 may sequentially receive the setting value of the BF parameter via the UI, or by reading the setting file from the memory 1002 and / or the storage 1003, the setting value corresponding to one or more beam patterns may be received. You may receive it collectively.

In addition, as exemplified in the UI of Table 1 and FIG. 12, the range of beams set in the 5G system model 1 (may be abbreviated as “beam setting range”) is set separately in the horizontal direction and the vertical direction. It may be possible. For example, the setting range in the horizontal direction may be defined by the lower limit value φ _min and the upper limit value φ _max, and the setting range in the vertical direction may be defined by the lower limit value θ _min and the upper limit value θ _max .

Similarly, the possible directional ranges of the main lobe of the beam (in other words, the main beam) may be separately settable in the horizontal direction and the vertical direction. For example, the horizontal range of the main beam may be defined by a lower limit value phi _0min and the upper limit value phi _0max, vertical range may be defined by a lower limit value theta _0min and the upper limit value theta _0max.

  Note that the beam gain calculation target direction in the horizontal direction of the candidate beam #m can be represented by “mΔφ”, and the beam gain calculation target direction in the vertical direction of the candidate beam #n can be represented by “nΔθ”.

Also, the main beam direction in the horizontal direction of the candidate beam #p can be represented by “pΔφ ₀ ”, and the main beam direction in the vertical direction of the candidate beam #q can be represented by “qΔθ ₀ ”. Note that m, n, p, and q are integers representing the numbers of a plurality of candidate beams and are variables.

FIG. 13 shows an example of a beam pattern obtained by setting the BF parameters described above. An example of the beam pattern exemplified in FIG. 13 is a pattern obtained when the vertical directions θ and θ ₀ are fixed to 0. Various beam patterns can be set by changing the settings of the BF parameters. In FIG. 13, a plurality of beam patterns with different main beam directivity, which are obtained by changing the setting of the BF parameter, are superimposed.

  In other words, the number of beam patterns depends on the number of set patterns of BF parameters. By changing the setting pattern of the BF parameters (for example, the directivity of the main beam), the beam pattern changes, so it is possible to simulate, for example, dynamic beamforming in which the directivity dynamically changes with time.

  Next, the beam search unit 312 illustrated in FIG. 10 will be described. The beam search unit 312 searches, for example, the beam gains of a plurality of candidate beams calculated by the beam gain calculation unit 311 and selects one (for example, a candidate beam with the highest communication performance, a candidate beam with the highest received power) Choose). Therefore, the beam search unit 312 is an example of a selection unit that selects one of a plurality of candidate beams in the dynamic BF, for which the communication performance (such as received power) is maximized.

  The communication performance calculation unit 313 is an example of a second calculation unit, and illustratively calculates information (for example, received power) related to communication performance based on the beam gain of the candidate beam selected in the beam search unit 312. Do. For example, in the 5G system model 1, the communication performance calculation unit 313 may use beams for a plurality of beams of beams emitted from an MS area corresponding to a virtual transmitter to an MS area corresponding to a virtual receiver. The beam gain selected in the search unit 312 is multiplied.

  Also, the communication performance calculation unit 313 calculates, for example, received power of a plurality of rays received in an MS area corresponding to a virtual receiver to calculate received power of a received beam. In this manner, the communication performance calculation unit 313 can calculate the received power according to the transmission and reception beam gain for each MS area.

(Example of beam gain calculation)
Next, an example of calculation of the beam gain in the above-described beam gain calculation unit 311 will be described using formulas.

The beam gain calculation unit 311 calculates the beam gain A _{A, Beami} (mΔφ, nΔθ) whose calculation target direction is (mΔφ, nΔθ), for example, using the following equation (1.1) (dB unit).

As shown in equation (1.1), the beam gain A _{A, Beami} can be calculated by combining the horizontal beam gain GBF _H (true value) and the vertical beam gain GBF _V (true value). .

Here, as exemplified in the following equation (1.2), the beam gains G _{BF and HV} (n, m) in the n-th vertical direction and the m-th horizontal direction are horizontal beam gains GBF _H (n , M) and the beam gain GBF _V (n, m) in the vertical direction.

From Formula (1.2), GBF _H (n, m) and GBF _V (n, m) can be represented by the following Formula (1.3) and Formula (1.4), respectively.

Here, γ _x in the formula (1.3) can be represented by the following formula (1.5), and γ _z in the formula (1.4) can be represented by the following formula (1.6) .

However, when γ _x becomes zero, the following equation (1.7) may be used instead of equation (1.3), and when γ _z becomes zero, the following equation may be used instead of equation (1.4) Equation (1.8) of may be used.

By using the equations (1.1) to (1.8), the beam gain calculation unit 311 can calculate the beam gains A _{A, Beami} (mΔφ, nΔθ) whose calculation target direction is (mΔφ, nΔθ) It can be calculated by separately calculating and combining the horizontal direction and the vertical direction.

Note that the beam gain calculation unit 311 may calculate the beam gain A _{A, Beami} (mΔφ, nΔθ), for example, using the following equation (1.9) instead of the equation (1.1) Good. In equation (1.9), an element gain pattern A _E (mΔφ, nΔθ) is added to equation (1.1). The specific formulas of γ _x and γ _z are not limited to Formula (1.5) and Formula (1.6) because they differ depending on the reference horizontal and vertical angles. This modification may be used.

By adding the element gain patterns A _E (mΔφ, nΔθ), it becomes possible to calculate the beam gain in consideration of each element gain pattern, and it is possible to improve the beam gain calculation accuracy of the specific array antenna.

(Modification of beam gain calculation)
The following equation (2.1) may be used instead of the equation (1.1).

Equation (2.1) may be regarded as equivalent to the approximate equation of equation (1.1), and the beam gain calculation unit 311 may calculate the beam gain GBF _H (n, m) in the horizontal direction using the BF parameter in the vertical direction. It can be calculated independently of. Similarly, the beam gain calculation unit 311 can calculate the beam gain GBF _V (n, m) in the vertical direction without depending on the BF parameter in the horizontal direction. In other words, equation (2.1) indicates that the horizontal and vertical beam gains can be calculated independently of each other.

  By using the equation (2.1), the amount of calculation in the beam gain calculation unit 311 can be reduced compared to the case of using the equation (1.1). On the other hand, if equation (1.1) is used, the calculation accuracy in the beam gain calculation unit 311 can be improved as compared with the case where equation (2.1) is used.

In addition, when Formula (2.1) is used, it changes to Formula (1.5) and Formula (1.6), and following Formula (2.2) and Formula (2.3) respectively It may be used in the gain calculation unit 311. The formulas (1.2) to (1.4), and the formulas (1.7) and (1.8) may be the same in this modification as well.

If equation (2.2) is compared with equation (1.5), in equation (2.2), Δθ and Δθ _0, which are BF parameters in the vertical direction, are unnecessary for calculation of γ _x I understand that there is.

Also in this modification, the beam gain calculation unit 311 exemplarily uses the following equation (2.4) instead of the equation (2.1) to obtain the beam gains A _{A, Beami} (mΔφ, nΔθ ) May be calculated. In equation (2.4), an element gain pattern A _E (mΔφ, nΔθ) is added to equation (2.1).

(Operation Example of Beam Gain Calculation Unit 311)
Next, an operation example of the beam gain calculation unit 311 will be described with reference to the flowchart illustrated in FIG.

  As illustrated in FIG. 14, the beam gain calculation unit 311 performs a first loop process in which the processes shown in S11 to S17 are repeated and a second loop process in which the processes shown in S13 to S16 are repeated. Run.

  Illustratively, the first loop process is repeated by the number of beam patterns in the horizontal direction, and the second loop process is repeated by the number of beam patterns in the vertical direction.

In the first loop processing, the beam gain calculation unit 311 calculates, for example, the beam gain GBF _H in the horizontal direction (S12). In the calculation of the beam gain GBF _H in the horizontal direction, the directivity characteristic in the vertical direction (in other words, the BF parameter in the vertical direction) may be fixed. As a non-limiting example, the directivity in the vertical direction may be fixed directly in front of the antenna array (see FIG. 11) (θ = 90 [deg], φ = 90 [deg]).

When the beam gain GBF _{H in the} horizontal direction is calculated, the beam gain calculation unit 311 calculates the beam gain GBF _V in the vertical direction by the second loop processing (S14). In the calculation of the beam gain GBF _V in the vertical direction, the directivity characteristic in the horizontal direction (in other words, the BF parameter in the horizontal direction) may be fixed. As a non-limiting example, the directional characteristics in the horizontal direction may be fixed directly in front of the antenna array (see FIG. 11) (θ = 90 [deg], φ = 90 [deg]).

When the beam gain GBF _{H in the} horizontal direction and the beam gain GBF _{V in the} vertical direction are calculated, the beam gain calculation unit 311 multiplies the two beam gains GBF _H and GBF _V to calculate a combined beam gain (S15).

  The processes of S14 and S15 are repeated by the number of beam patterns in the vertical direction in the second loop process. When the processes of S14 and S15 are repeated by the number of beam patterns in the horizontal direction and the vertical direction, the beam gain calculation unit 311 leaves the second loop process (S16) and returns to the first loop process (S11).

Then, for the beam pattern in the horizontal direction different from the previous one, the beam gain calculation unit 311 calculates the beam gain GBF _H in the horizontal direction with the directivity in the vertical direction fixed.

When the beam gain GBF _{H in the} horizontal direction is calculated, the beam gain calculation unit 311 calculates the beam gain GBF _V in the vertical direction by fixing the directivity characteristic in the horizontal direction by the second loop processing (S14) .

When the beam gain GBF _{H in the} horizontal direction and the beam gain GBF _{V in the} vertical direction are calculated, the beam gain calculation unit 311 multiplies the two beam gains GBF _H and GBF _V to calculate a combined beam gain (S15).

  As described above, the first loop processing and the second loop processing are repeated by the number of beam patterns. When the number of repetitions of the first loop processing reaches the number of beam patterns in the horizontal direction, the beam gains for different beam patterns in the horizontal direction and the vertical direction are comprehensively calculated. Therefore, the beam gain calculation unit 311 may exit the first loop processing (S17) and end the beam gain calculation processing.

The calculation order of the beam gain GBF _H in the horizontal direction and the beam gain GBF _{V in the} vertical direction can be interchanged with each other. For example, contrary to the example of FIG. 14, calculated from the vertical direction of the beam gain GBF _V may be initiated.

  Also, calculation of beam gain may be performed in real time based on each of the above equations, or a value calculated in advance based on each of the above equations may be stored, for example, in memory 1002 and / or storage 1003 However, it may be performed by referring to it at the time of beam gain calculation.

  The beam search unit 312 (see FIG. 10) searches the combined beam gain calculated for the plurality of candidate beam patterns in the beam gain calculation unit 311 as described above, and considers the beam gain of each candidate beam pattern, The candidate beam pattern that maximizes the communication performance (for example, received power) is selected.

  The communication performance calculation unit 313 uses the beam gain of the candidate beam pattern selected by the beam search unit 312 to calculate information (for example, at least one of received power, SINR, and throughput) related to communication performance. .

For example, the communication performance calculation unit 313 can calculate the received power (S) by the following equation (3.1).
Received power (S) [dB] = Transmit power + Path gain + Antenna gain +
Fading margin + penetration loss (3.1)

  Here, “transmission power” is transmission power on the BS side when obtaining reception power on the MS side, and transmission power on the MS side when obtaining reception power on the BS side. When a plurality of rays are emitted from the BS or MS to simulate a radio wave propagation model by the ray tracing method, the received power S is the sum of the received powers of the respective rays because the plurality of rays are emitted. The path gain is calculated in consideration of the emission angle and / or propagation path of each ray, and the antenna gain in the candidate beam is determined, and the received power of each ray is calculated.

In addition, the “antenna gain” may be a value for any one or both of the BS side and the MS side (any one of the following formulas (3.2) to (3.4)).
Antenna gain = BS antenna gain that maximizes communication performance + fixed MS antenna gain (3.2)
Antenna gain = fixed BS antenna gain + MS antenna gain that maximizes communication performance (3.3)
Antenna gain = BS antenna gain with maximum communication performance + MS antenna gain with maximum communication performance (3.4)

  In the case of Equation (3.2), dynamic BF is applied only to the BS side, and a fixed beam pattern is applied to the MS side. The antenna gain at the BS side is determined based on, for example, a beam pattern that maximizes communication performance.

  In the case of Equation (3.3), dynamic BF is applied only to the MS side, and a fixed beam pattern is applied to the BS side. The antenna gain on the MS side is determined based on, for example, a beam pattern that maximizes communication performance.

  In the case of equation (3.4), dynamic BF is applied to both the BS side and the MS side, and BS beam gain and MS beam gain are, for example, BS antenna gain and MS antenna gain at which communication performance is maximized. Calculated based on pairs of

  The “antenna gain” may be a value obtained by multiplying the combined beam gain calculated in the beam gain calculation unit 311 by the antenna gain in the case of “no dynamic BF”. Also, "antenna gain" may be calculated including parameters for at least one of a fixed beam pattern, a propagation environment (eg, shadowing loss), and a shield (shield loss).

  The “path gain” may be calculated based on, for example, the result of ray tracing, or may be calculated based on a formula of a path loss model.

When the reception power (S) is obtained, the communication performance calculation unit 313 can calculate SINR (may be called “link budget”) according to the following equation (3.5).
SINR [dB] = S-IN [dB] (3.5)

Here, the true value of “IN” in equation (3.5) is, for example, the true value of interference component (I) and the true value of noise component (N), as shown in equation (3.6) below. It can be calculated by the addition of
IN (true value) = I + N (3.6)

Also, “N” can be calculated, for example, by the following equation (3.7).
N [dB] = thermal noise density (dBm / Hz) +
Noise figure (NF) + 10 Log 10 (BW) (3.7)
Note that “BW” represents, for example, a frequency bandwidth set between the BS to be evaluated and the MS area in the 5G system model 1.

When the SINR is determined, the communication performance calculation unit 313 can calculate (may be referred to as “mapping”) the throughput (R) according to, for example, the following equation (3.8) (throughput calculation by Shannon equation).
R = a × BW × min {Log 2 (1 + 10 ^ (SINR / 10) / b), c}
(3.8)
As the values of a, b, and c, different values are set according to the overhead in the radio interface, the number of layers of MIMO transmission (such as layer 1 or layer 2), and / or the maximum modulation scheme. Good.

(Effect in the embodiment)
The information related to the communication performance calculated as described above is associated with the MS area in the 5G system model 1, for example, from the output device 1006 to an external device (for example, a display) as a communication performance area map as shown in FIG. It may be output.

  The association may be performed, for example, by the area evaluation unit 34 (see FIG. 9) embodied in the processor 1001. The association may be performed for each of a plurality of possible combination candidates that the BS and UE pairs (in other words, MS area pairs) arranged in the 5G system model 1 can take.

  Information related to communication performance is output in association with the MS area, whereby in the 5G system model 1, dynamic BF can visualize and present changes in communication performance that can change locally and / or temporally. Therefore, the communication performance of the 5G system can be accurately evaluated, and for example, BS placement design and the like that can maximize the communication performance for the UE can be easily performed.

  Also, as an example of selecting one of a plurality of candidate beam patterns for the combination of BS and MS area, by selecting the candidate beam pattern with the highest communication performance, in the candidate beam patterns for which the communication performance is maximized. Beam gain can be calculated, and communication performance in a certain area can be evaluated more accurately.

  The criterion for selecting a candidate beam pattern may be a candidate beam pattern whose beam gain is smaller than the maximum (for example, the smallest). In this case, for example, BF can visualize places and / or times where communication performance is not good for the UE.

  Further, in calculating the beam gain, the combined beam gain is calculated by calculating and combining the beam gains separately in the horizontal direction and the vertical direction, so that the beam formers to be multiplied with respect to the individual antenna elements forming the antenna array It is not necessary to generate (precoder beam weight) and calculate the beam gain. Therefore, it is possible to reduce the amount of calculation spent for calculating the beam gain, and to reduce the amount of memory used for calculating the beam gain.

As a comparative example, FIG. 15 and FIG. 16 show tables (formulas) described in Non-Patent Document 5 mentioned above. In the table (formula) described in Non-Patent Document 5, since it is not possible to calculate beam gain A _{A, Beami separately} in the horizontal direction and in the vertical direction, a beamformer which multiplies each of the individual antenna elements forming the antenna array. We have to generate (precoder, beam weight) and calculate the beam gain. Therefore, the amount of memory used to calculate the beam gain increases.

  In the embodiment described above, the size of the MS area partitioning the 5G system model 1 may be variable. For example, if the size of the MS area to be partitioned is too small, the computational load becomes large, and conversely, if the size of the MS area to be partitioned is too large, the evaluation accuracy may deteriorate. Therefore, the size of the MS area may be changed according to the trade-off relationship between the evaluation accuracy expected in the simulation of the 5G system model 1 and the allowable calculation load.

  Further, in the 5G system model 1, the sizes of MS areas to be divided may be all the same size regardless of places or may be different sizes depending on places. For example, the size of the MS area may be set small for places where high evaluation accuracy is required, and the size of the MS area may be set large for places where low evaluation accuracy is acceptable.

  The embodiments of the present invention have been described above.

(Hardware configuration)
Note that the block diagram used in the description of the above embodiment shows blocks in units of functions. These functional blocks (components) are realized by any combination of hardware and / or software. Moreover, the implementation means of each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It may be connected by (for example, wired and / or wireless) and realized by the plurality of devices.

(Adaptive system)
Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wide Band), The present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.

(Processing procedure etc.)
As long as there is no contradiction, the processing procedure, sequence, flow chart, etc. of each aspect / embodiment described in this specification may be reversed. For example, for the methods described herein, elements of the various steps are presented in an exemplary order and are not limited to the particular order presented.

(Handling of input / output information etc.)
The input / output information or the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information etc. may be deleted. The input information or the like may be transmitted to another device.

(Judgment method)
The determination may be performed by a value (0 or 1) represented by one bit, may be performed by a boolean value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value). Comparison with the value).

(software)
Software may be called software, firmware, middleware, microcode, hardware description language, or any other name, and may be instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. Should be interpreted broadly to mean applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc.

  Also, software, instructions, etc. may be sent and received via a transmission medium. For example, software may use a wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.

(Information, signal)
The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips etc that may be mentioned throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any of these May be represented by a combination of

  The terms described in the present specification and / or the terms necessary for the understanding of the present specification may be replaced with terms having the same or similar meanings. For example, the channels and / or symbols may be signals. Also, the signal may be a message. Also, the component carrier (CC) may be called a carrier frequency, a cell or the like.

("System", "Network")
The terms "system" and "network" as used herein are used interchangeably.

(Name of parameter, channel)
In addition, the information, parameters, and the like described in the present specification may be represented by absolute values, may be represented by relative values from predetermined values, or may be represented by corresponding other information. . For example, radio resources may be indexed.

  The names used for the parameters described above are in no way limiting. In addition, the formulas etc. that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg PUCCH, PDCCH etc.) and information elements (eg TPC etc.) can be identified by any suitable names, the various names assigned to these various channels and information elements can be Is not limited.

(base station)
A base station (radio base station) can accommodate one or more (e.g., three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head. The terms "cell" or "sector" refer to a part or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage. Furthermore, the terms "base station", "eNB", "gNB", "cell" and "sector" may be used interchangeably herein. A base station may be called in terms of a fixed station (Node station), Node B, eNode B (eNB), gNode B, access point (Access point), small cell, and the like. The small cell is an example of a cell having a smaller coverage than the macro cell. The small cells may have different names depending on the coverage area. For example, a small cell may be referred to as a "femtocell", "picocell", "microcell", "nanocell", "metrocell", "home cell" or the like. The terms "cell" or "sector" refer to the individual geographical areas where the base station provides wireless service, as well as to the communication functions managed by the base station to communicate with the terminals in their respective geographical areas. It may also mean part of

(Terminal)
The user terminal may be a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote communication device, a mobile subscriber station, an access terminal, a mobile terminal by a person skilled in the art It may also be called a terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, a UE (User Equipment), or some other suitable term. The terminal may be a fixed terminal whose position does not change, or a mobile terminal whose position changes. As a non-limiting example, the terminal may be a mobile terminal such as a mobile phone, a smart phone, a tablet terminal and the like. Also, the terminal may be an IoT (Internet of Things) terminal. Communication functions can be installed in various “things” by IoT. Various "objects" having a communication function can communicate by connecting to the Internet, a wireless access network, or the like. For example, the IoT terminal may include a sensor device or a meter (measuring device) having a wireless communication function. Any monitoring device such as a monitoring camera equipped with a sensor device or a meter or a fire alarm may correspond to the terminal. Wireless communication between a terminal that is an IoT terminal such as a monitoring device and a base station may be referred to as MTC (Machine Type Communications). Therefore, the said terminal may be called "MTC device."

(Meaning and interpretation of terms)
The terms "determining", "determining" as used herein may encompass a wide variety of operations. "Judgment", "decision" are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc. Also, "determination" and "determination" are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”. Also, "judgement" and "decision" are to be considered as "judgement" and "decision" that they have resolved (resolving), selecting (selecting), choosing (choosing), establishing (establishing), etc. May be included. That is, "judgment""decision" may include considering that some action is "judged""decision".

  The terms "connected", "coupled" or any variants thereof mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled”. The coupling or connection between elements may be physical, logical or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and radio frequency as some non-limiting and non-exclusive examples. It can be considered "connected" or "coupled" to one another by using electromagnetic energy such as electromagnetic energy having wavelengths in the region, microwave region and light (both visible and invisible) regions.

  The reference signal may be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) according to the applied standard. Moreover, DMRS may be another corresponding name, for example, RS for demodulation or DM-RS.

  As used herein, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

  The “parts” in the configuration of each of the above-described devices may be replaced with “means”, “circuit”, “device” or the like.

  As long as “including”, “comprising”, and variations thereof are used in the present specification or claims, these terms as well as the term “comprising” are inclusive. Intended to be Further, it is intended that the term "or" as used in the present specification or in the claims is not an exclusive OR.

  A radio frame may be comprised of one or more frames in the time domain. One or more frames in the time domain may be referred to as subframes, time units, and so on. A subframe may be further comprised of one or more slots in the time domain. The slot may be further configured with one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier-frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain.

  A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units when transmitting a signal. A radio frame, a subframe, a slot, a minislot, and a symbol may be another name corresponding to each.

  For example, in the LTE system, the base station performs scheduling to assign radio resources (frequency bandwidth usable in each mobile station, transmission power, etc.) to each mobile station. The minimum time unit of scheduling may be called a TTI (Transmission Time Interval).

  For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, one slot may be called a TTI, and one minislot may be called a TTI.

  A resource unit is a resource allocation unit in time domain and frequency domain, and may include one or more consecutive subcarriers in frequency domain. Also, the time domain of the resource unit may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI long. One TTI and one subframe may be configured of one or more resource units, respectively. Also, resource units may be referred to as resource blocks (RBs), physical resource blocks (PRBs: physical RBs), PRB pairs, RB pairs, scheduling units, frequency units, and subbands. Also, a resource unit may be configured of one or more REs. For example, 1 RE may be a resource of a unit smaller than the resource unit serving as a resource allocation unit (for example, the smallest resource unit), and is not limited to the name of RE.

  The above-described radio frame structure is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of minislots included in the subframe, and the symbols and resource blocks included in the slots. The number and the number of subcarriers included in the resource block can be variously changed.

  Throughout the disclosure, when articles are added by translation, such as, for example, a, an, and the in English, these articles are not clearly indicated by the context: It shall contain several things.

(Variation of aspect etc.)
Each aspect / embodiment described in this specification may be used alone, may be used in combination, and may be switched and used along with execution. In addition, notification of predetermined information (for example, notification of "it is X") is not limited to what is explicitly performed, but is performed by implicit (for example, not notifying of the predetermined information) It is also good.

  Although the present invention has been described above in detail, it is apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be embodied as modifications and alterations without departing from the spirit and scope of the present invention defined by the description of the claims. Accordingly, the description in the present specification is for the purpose of illustration and does not have any limiting meaning on the present invention.

  One aspect of the present invention is useful for evaluation of a mobile communication system.

1 Wireless communication system (system model for evaluation)
Reference Signs List 2 base station 10 wireless communication system (5G system) evaluation unit 31 link budget calculation unit 32 cover area determination unit 33 interference calculation unit 34 area evaluation unit 200 wireless communication area 311 beam gain calculation unit 312 beam search unit 313 communication performance calculation unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus

Claims (6)

An input unit to which parameters for setting a plurality of candidate beam patterns of dynamic beam forming to be applied to a system model simulating a wireless communication system are input;
A beam gain when one of the plurality of candidate beam patterns is selectively applied to at least one of the first place and the second place in the system model is calculated based on the parameter, and the beam gain is calculated. Processing for generating information on communication performance between the first place and the second place, and associating the information on the communication performance with at least one of the first place and the second place, A processing unit which is performed for each different combination candidate of the first place and the second place set in the system model;
An output unit that outputs information related to the communication performance, which is associated with at least one of the first place and the second place for each of the combination candidates;
An evaluation device for a wireless communication system, comprising: The processing unit is
A first calculator configured to calculate the communication performance based on beam gain when each of the plurality of candidate beam patterns is applied based on the parameter;
A selector configured to select a candidate beam pattern having the highest communication performance calculated among the plurality of candidate beam patterns;
A second calculator configured to calculate received power, which is information related to the communication performance, based on the beam gain of the selected candidate beam pattern;
The evaluation device of the wireless communication system according to claim 1, comprising: The input unit may receive previous parameters separately for the horizontal direction and the vertical direction of each of the plurality of candidate beam patterns,
The first calculation unit calculates and combines the beam gains of each of the plurality of candidate beam patterns separately in the horizontal direction and the vertical direction based on the other parameters in the horizontal direction and the vertical direction, and
The evaluation apparatus of the wireless communication system according to claim 2, wherein the selection unit selects a candidate beam pattern having the largest communication performance calculated based on the combined beam gain.   The second calculation unit is a signal-to-interference noise ratio (SINR) and throughput that are information related to the communication performance between the first place and the second place based on the received power. The evaluation apparatus of the radio | wireless communications system of Claim 2 or 3 which calculates at least one. The first calculation unit uses m, n, p, q, N _Tx, Δx, Δz, φ, φ ₀ , θ, θ ₀ , Δφ, Δφ ₀ , Δθ, and Δθ ₀ as the parameters described below. The evaluation device of a wireless communication system according to claim 3, wherein the combined beam gains G _{BF and HV} (n, m) are calculated by the equations (1), (2) and (3).

Here, m, n, p, and q are variables representing the number of the candidate beam pattern, and N _Tx represents the number of antenna elements in the horizontal direction of the array antenna used for the dynamic beam forming, and N _Tz Represents the number of antenna elements in the vertical direction of the array antenna, .DELTA.x represents the distance between the antenna elements in the horizontal direction of the array antenna, .DELTA.z represents the distance between the antenna elements in the vertical direction of the array antenna, and .phi. The variable representing the angular range of the candidate beam pattern in the horizontal direction, φ ₀ is a variable representing the angular range of the main beam in the candidate beam pattern in the horizontal direction, and θ is the vertical of the candidate beam pattern Θ ₀ is an angle range of the main beam of the candidate beam pattern in the vertical direction. Is a variable that represents the beam spacing in the horizontal direction of the candidate beam pattern, .DELTA..phi. ₀ is a variable that represents the beam spacing in the horizontal direction of the main beam of the candidate beam pattern, and .DELTA..theta. Is a variable representing the beam spacing in the vertical direction of the candidate beam pattern, and Δθ ₀ is a variable representing the beam spacing in the vertical direction of the main beam of the candidate beam pattern.   One of the first place and the second place corresponds to a place where a base station is located, and the other of the first place and the second place can be a user who can wirelessly communicate with the base station The evaluation apparatus of the radio | wireless communications system of any one of Claims 1-5 corresponding to the place where a terminal is located.

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