CN114401061A - Method and device for determining radio protection area - Google Patents
Method and device for determining radio protection area Download PDFInfo
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Abstract
The application discloses a method and a device for determining a radio protection area. The method comprises the following steps: determining a first transmission loss from a transmitter to each grid in the grid network based on a free space propagation model; determining the single-edge diffraction loss on a straight path from the transmitter to each grid according to the first transmission loss; determining a first received power of each grid according to the single-edge diffraction loss; determining a second transmission loss from the transmitter to each grid based on the extended Hata propagation model, and further determining a second receiving power of each grid; determining the target receiving power of each grid according to the first receiving power and the second receiving power of each grid; the radio protection area of the transmitter is determined based on the target received power of each mesh.
Description
Technical Field
The present application relates to the field of radio communications technologies, and in particular, to a method and an apparatus for determining a radio protection area.
Background
With the development of mobile communication technology, the technology of wireless communication systems is in the endlessly. After the introduction of fifth generation Mobile Communication (5G) system services worldwide, 5G systems support various Communications in various applications through Enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLC), and Massive machine type Communications (mtc).
In addition to the 5G nationwide public network services provided by telecommunications carriers, local 5G (i.e., private 5G networks operated autonomously by each entity, which can be flexibly deployed and used within their premises) is also of interest. For example, local 5G is expected to be used for communication for smart factories, as well as localized communication for remote control of drones and heavy machinery at construction sites or disaster sites.
With the spread of local 5G systems in the future, many local 5G systems will need to coexist in nearby areas. The scarcity of spectrum resources forces multiple co-existing wireless communication systems to operate on adjacent frequency resources. In scenarios where two or more adjacent frequency communication systems coexist, receiver filter non-idealities will inevitably introduce intersystem interference. Therefore, the coexisting radio communication areas are researched and calculated, spectrum sharing is realized, interference among systems is avoided, and the method plays a very important role in planning the spectrum of the whole network and improving the operation quality of each system.
Currently, a typical method for avoiding intersystem interference between spectrum sharing systems is: the radio protection zone is calculated using system parameters (such as transmit power and antenna gain) and a propagation model. Generally, a free space propagation model (FS propagation model or FS model for short) and an extended Hata model (EH propagation model or EH model) are mainly used for coverage estimation of a wireless communication system. However, the conventional FS model and EH model have a problem of excessive calculation area, and the spectrum utilization efficiency is reduced. In addition, it also creates a lack of radio coverage, increasing interference.
Therefore, how to determine a radio protection area to reduce inter-system interference for a scenario where multiple communication systems coexist is a technical problem to be solved at present.
Disclosure of Invention
The application provides a method and a device for determining a radio protection area, which are used for determining the radio protection area to reduce inter-system interference aiming at a coexistence scene of a plurality of communication systems.
In a first aspect, a radio protection area determining method is provided, including:
determining a first transmission loss from a transmitter to each grid in the grid network based on a free space propagation model;
determining a single-edge diffraction loss on a straight path from the transmitter to each grid according to a first transmission loss from the transmitter to each grid;
determining a first received power of each grid according to the single-edge diffraction loss on a straight-line path from the transmitter to each grid;
determining a second transmission loss from the transmitter to each grid based on an extended Hata propagation model, and determining a second received power of each grid according to the second transmission loss from the transmitter to each grid;
determining the target receiving power of each grid according to the first receiving power and the second receiving power of each grid;
and determining the radio protection area of the transmitter according to the target receiving power of each grid.
Optionally, the determining, based on the free space propagation model, a first transmission loss from the transmitter to each mesh in the mesh network includes:
determining distances between the transmitters and the grids, respectively;
determining a first transmission loss from the transmitter to each grid according to the distance between the transmitter and each grid;
wherein, the distance between the transmitter and any one of the grids satisfies the following formula:
d＝R·arccos{sinφ1sinφ2+cosφ1cosφ2cos(λ1-λ2)}
where d is the first transmission loss, R is the radius of the earth, and the spherical coordinate of the position of the transmitter is (phi)1，λ1) The spherical coordinate of the central point of the grid is (phi)2，λ2)；
A first transmission loss from the transmitter to any one of the grids satisfies the following equation:
L＝32.45+20log(d)+20log(f)
where L is the first transmission loss, f is the frequency of the signal transmitted by the transmitter, and d is the distance of the transmitter from the grid.
Optionally, a single-edge diffraction loss on a straight-line path from the transmitter to any one of the grids satisfies the following formula:
wherein J (v) represents a single-edge diffraction loss, d1Distance of transmitting antenna to single-edged edge, d2The distance from the receiving antenna to the single-blade edge is defined as h, the height or the depth of the single-blade edge from the transmitting antenna to a connecting line of the receiving antenna is defined as h, and lambda represents the wavelength; when upsilon is<When J (ν) ≈ 0.78, J (ν) ≈ 0.
Optionally, the first received power of any one of the grids satisfies the following formula:
pr＝pt-20logd-20log(f)+242-L-J(v)
wherein p isrRepresenting received power, ptDenotes transmission power, j (v) denotes single-edge diffraction loss, f is frequency, d is distance between receiver and transmitter, and L denotes first transmission loss.
Optionally, the determining the target received power of each grid according to the first received power and the second received power of each grid includes:
for each of the meshes, performing the steps of:
determining a larger value among the first and second reception powers, the larger value being determined as a target reception power.
In a second aspect, a radio protection area estimation apparatus is provided, including:
the free space propagation model calculation module is used for determining first transmission loss from the transmitter to each grid in the grid network based on the free space propagation model; determining a single-edge diffraction loss on a straight path from the transmitter to each grid according to a first transmission loss from the transmitter to each grid; determining a first received power of each grid according to the single-edge diffraction loss on a straight-line path from the transmitter to each grid;
an extended-Hata propagation model calculation module, configured to determine, based on the extended-Hata propagation model, second transmission losses from the transmitter to the grids, and determine, according to the second transmission losses from the transmitter to the grids, second received powers of the grids;
a target power determining module, configured to determine a target received power of each grid according to the first received power and the second received power of each grid;
and a radio protection area determining module, configured to determine a radio protection area of the transmitter according to the target received power of each mesh.
Optionally, the free space propagation model calculation module is specifically configured to:
determining distances between the transmitters and the grids, respectively;
determining a first transmission loss from the transmitter to each grid according to the distance between the transmitter and each grid;
wherein, the distance between the transmitter and any one of the grids satisfies the following formula:
d＝R·arccos{sinφ1sinφ2+cosφ1cosφ2cos(λ1-λ2)}
where d is the first transmission loss, R is the radius of the earth, and the spherical coordinates of the location of the transmitter are: (φ1，λ1) The spherical coordinate of the central point of the grid is (phi)2，λ2)；
A first transmission loss from the transmitter to any one of the grids satisfies the following equation:
L＝32.45+20log(d)+20log(f)
where L is the first transmission loss, f is the frequency of the signal transmitted by the transmitter, and d is the distance of the transmitter from the grid.
Optionally, a single-edge diffraction loss on a straight-line path from the transmitter to any one of the grids satisfies the following formula:
wherein J (v) represents a single-edge diffraction loss, d1Distance of transmitting antenna to single-edged edge, d2The distance from the receiving antenna to the single-blade edge is defined as h, the height or the depth of the single-blade edge from the transmitting antenna to a connecting line of the receiving antenna is defined as h, and lambda represents the wavelength; when upsilon is<When J (ν) ≈ 0.78, J (ν) ≈ 0.
Optionally, the first received power of any one of the grids satisfies the following formula:
pr＝pt-20logd-20log(f)+242-L-J(v)
wherein p isrRepresenting received power, ptDenotes transmission power, j (v) denotes single-edge diffraction loss, f is frequency, d is distance between receiver and transmitter, and L denotes first transmission loss.
Optionally, the target power determining module is specifically configured to:
for each of the meshes, performing the steps of:
determining a larger value among the first and second reception powers, the larger value being determined as a target reception power.
In a third aspect, a communication apparatus is provided, including: a processor, a memory; the memory storing computer instructions; the processor is configured to read the computer instructions to perform the method according to any one of the above first aspects.
In a fourth aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any of the first aspects above.
In a fifth aspect, there is provided a computer program product which, when invoked by a computer, causes the computer to perform the method of any of the first aspects above.
In the above embodiments of the present application, on one hand, single-edge diffraction is considered on the basis of a free space propagation (FS) model, so that the estimation performance of the radio protection area is improved; on the other hand, single-edge diffraction is considered on the basis of a free space propagation (FS) model, and meanwhile, an expansion-Hata propagation model (EH model) is combined for calculation, so that the utilization efficiency of high frequency spectrum is improved, and reliable interference protection is realized.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a measurement scenario for constructing an EH model according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a received power distribution measured by a distance between a transmitter and a receiver using a conventional method;
fig. 3 is a flowchart illustrating a method for determining a radio protection area according to an embodiment of the present application;
FIG. 4 is a graph illustrating margin power setting for each target using different methods;
FIG. 5 is a schematic illustration of normalized protection zones provided by each target using different methods;
fig. 6 is a schematic structural diagram of a radio protection area determining apparatus provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
First, a brief description will be given of a part of the technology and technical terms related to the embodiments of the present application.
(1) A free space propagation model (hereinafter referred to as FS model).
FS model: for predicting the received signal field strength when there is a completely unobstructed line-of-sight path between the receiver and the transmitter. Satellite communication systems and microwave line-of-sight wireless links are typically free space propagation. Like most large-scale radio wave propagation models, the FS model predicts the attenuation of received power as a function of T-R (distance between transmitter and receiver) distance (power function).
The received power of the antenna in free space, d, from the transmitter is given by the following formula (this formula is called Friis 'formula or free space' formula):
wherein, PTIs the radiated power of the antenna; gTGain for the transmit antenna; gRIs the gain of the receiving antenna; l is a system loss factor independent of propagation; λ is the wavelength in meters. From the above equation, the received power at the distance antenna d is a function of the T-R distance (i.e., the distance between the transmitter and the receiver), the received power at the receiver decays with the square of the T-R distance, and the received power is 20dB/10 times the distance.
When the wavelength is lambda and the distance between the transmitting antenna and the receiving antenna is d, the formula for calculating the propagation loss L based on the FS model is as follows:
(2) the extended-Hata propagation model (hereinafter referred to as EH model).
The Hata model is a widely used propagation model for median path loss prediction, and is suitable for path loss prediction of macro cells. The EH model is a radio propagation model for 150-1500MHz outdoor cellular transmission, taking into account the effects of diffraction, reflection and scattering caused by urban structures. To predict the propagation of new commercial broadband services in the 3.5GHz band, NTIA engineers extended the Hata model in frequency and distance, creating an extended Hata urban propagation model (EH).
The EH model is a propagation model designed based on experimental measurements. In the EH model, the propagation loss can be calculated by frequency, distance between terminals, antenna height, and environment-related parameters.
Fig. 1 schematically shows a measurement scenario for constructing an EH model, and table 1 exemplarily shows a measurement experiment specification. As shown in fig. 1, the transmission signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal based on Long Term Evolution (LTE) in a 5MHz bandwidth mode, and is generated by a software defined radio. The transmission signal is transmitted from a balcony 13 m high. The receiver (or receiver) employs a hand-held Spectrum Analyzer (SA). The spectrum analyzer and the receiving antenna are mounted on a mobile cart with a satellite Positioning (e.g. Global Positioning System (GPS)) recorder.
Table 1: specification of measurement experiment
| Parameter(s) | Value of |
| Center frequency | 2587.5MHZ |
| Transmission power | 23.1dBm |
| Channel bandwidth | 5.0MHz |
| Frequency resolution bandwidth RBW of spectrum analyzer | 3kHz |
| Video resolution bandwidth VBW of spectrum analyzer | 3kHz |
| Reference level | -70dBm |
| Range | 5MHz |
| Base |
13m |
| Mobile station antenna height | 1.4m |
| Antenna gain (base station) | 2.15dBi |
| Antenna gain (Mobile station) | 2.15dBi |
Fig. 2 shows the measured received power versus the distance between the transmitter and the receiver. The conventional FS model-based and EH model-based calculation of the distance characteristic of the received power can be compared based on fig. 2. From the radio protection point of view, the distance characteristic of the received power calculated by the propagation loss model must be larger than the actual measurement value. However, at a distance d of 117m, the measured received power is-53.8 dBm. The conventional FS model-based calculated received power is-54.7 dBm, and the conventional EH model-based calculated received power is-86.2 dBm. Therefore, there is a problem in that interference protection cannot be provided based on the conventional model.
In order to solve the above problem, an embodiment of the present application provides a radio protection area determining method for achieving high spectral efficiency and interference protection. According to the embodiment of the application, the influence of single-edge diffraction is considered in a traditional free space propagation model (FS model), and then the single-edge diffraction is combined with a traditional expansion-Hata model (EH model), so that the efficiency is improved. The method for determining the radio protection area provided by the embodiment of the application can realize high spectrum efficiency and interference protection and avoid interference between spectrum sharing systems. By adopting the embodiment of the application, a plurality of local communication systems (such as 5G systems) can be effectively accommodated without interference.
Based on the radio protection area determined by the embodiment of the present application, configuration parameters of the network device, such as the size of the configured transmission power, may be set to reduce inter-system interference. The network device, for example, includes AN Access Network (AN) device, such as a base station (e.g., AN access point), which may refer to a device in the access network that communicates with the wireless terminal device over one or more cells over AN air interface. The network device may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5G) New Radio (NR) system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud ran) system, which is not limited in the embodiments of the present application.
The technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the accompanying drawings. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" in the text is only an association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: three cases of a alone, a and B both, and B alone exist, and in addition, "a plurality" means two or more than two in the description of the embodiments of the present application.
The terms "first", "second" and "first" are used herein for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of embodiments of the application, unless stated otherwise, "plurality" means two or more.
In the embodiment of the present application, the radio protection area is determined based on a single-edge diffraction model having an ideal obstacle shape, instead of the conventional FS model. Based on the single-edge diffraction model with the ideal obstacle shape, when the wavelength is λ, a diffraction parameter v corresponding to the ratio of the fresnel radius to the obstacle height is expressed as:
wherein d is1Distance of transmitting antenna to knife edge, d2H is the distance from the receiving antenna to the knife edge, and h is the height or depth of the knife edge from the transmitting antenna to the connecting line of the receiving antenna.For upsilon>0.78, the approximate expression for the single-edged diffraction loss J (u) (dB) can be expressed as:
wherein, when upsilon < ═ 0.78, J (upsilon) ≈ 0.
In the embodiment of the application, the target area may be subjected to mesh division, and the size of each mesh may be set as required, for example, the mesh network may be a mesh having a mesh structure with a longitude and latitude of 1 second. Further, the intersection point of the diagonal lines in a grid can be defined as the center position Q of the grid, and the subsequent calculation of the distance from the transmitter (such as a base station) to a grid and the transmission loss is performed according to the distance between the transmitter and the center position Q of the grid. It is understood that the distance between the transmitter and the grid and the transmission loss may also be calculated with reference to other points in the grid, which is not limited in the embodiments of the present application.
Referring to fig. 3, a schematic flowchart of a method for determining a radio protection area according to an embodiment of the present application is provided, where the flowchart may be implemented by a radio protection area determining apparatus, and the apparatus may be implemented by software, or implemented by hardware, or implemented by a combination of software and hardware.
As shown in fig. 3, the process may include the following steps:
s301: a first transmission loss of the transmitter to each mesh in the mesh network is determined based on a free space propagation model.
Alternatively, the first transmission loss of a transmitter to a mesh may be determined based on the distance between the transmitter position P and the mesh center point Q.
Alternatively, the distance between the transmitter position P and the grid center point Q may be determined computationally using the following equation:
d＝R·arccos{sinφ1sinφ2+cosφ1cosφ2cos(λ1-λ2)}………(5)
wherein R is the radius of the earth, and R is 6378.137 km; it is composed ofIts parameter is a spherical coordinate related parameter, i.e. the spherical coordinate (phi) of the transmitter position P1，λ1) And spherical coordinates (phi) of the center point Q of the grid2，λ2)。
Alternatively, the first transmission loss from the transmitter to a mesh can be calculated using the following equation:
L＝32.45+20log(d)+20log(f)…………………(6)
where L is the first transmission loss, f is the frequency of the signal transmitted by the transmitter, and d is the transmitter-to-grid distance.
S302: determining the single-edge diffraction loss on the straight-line path from the transmitter to each grid according to the first transmission loss from the transmitter to each grid.
In this step, the single-edged diffraction losses, including building height, latitude, longitude, can be calculated from the maximum elevation on the straight-line path from the transmitter (e.g., base station) to each grid.
Alternatively, the single-edge diffraction loss j (v) can be calculated by selecting the position with the largest building height, latitude and longitude according to the above formula (4).
S303: the first received power of each grid is determined based on the one-edge diffraction loss on the straight path from the transmitter to each grid.
In this step, the estimated received power at each grid can be calculated from the total propagation loss of the single-edge diffraction loss and the free-space propagation loss.
Optionally, the calculation formula of the received power is as follows:
pr＝pt-20logd-20log(f)+242-L-J(v)…………………(6)
wherein p isrRepresenting received power, ptDenotes the emitted power, J (v) denotes the single-edge diffraction loss, and f is the frequency in MHz. d is the distance between the receiver (such as a mobile station or terminal) and the transmitter (such as a base station) in km; l represents transmission loss.
S304: and determining a second transmission loss from the transmitter to each grid based on the extended Hata propagation model, and determining a second receiving power of each grid according to the second transmission loss from the transmitter to each grid.
In the EH model, the propagation loss can be calculated by frequency, distance between terminals, antenna height, and environment-related parameters.
For the EH model, the median path loss L may be calculated according to the following equationP：
LP＝69.55+26.16logf-13.82loghb-a(hm)+(44.9-6.55loghb)logd…(7)
Where f is frequency in MHz. d is the distance between a receiver (such as a mobile station or terminal) and a transmitter (such as a base station) in km. h ism，hbThe heights of a receiver (e.g., a mobile station) and a transmitter (e.g., a base station), respectively, are both in units of m. a (h)m) Is the correction factor.
For medium and small cities, the correction coefficient a (h)m) Comprises the following steps:
a(hm)＝(1.1logf-0.7)hm-(1.56logf-0.8)………(7)
for large cities, the correction factor a (h)m) Comprises the following steps:
for suburban areas, the path loss (i.e., the second path loss) L is:
the path loss (i.e., the second path loss) L for the open rural area is:
L＝Lp-4.78(logf)2-18.33log(f)-40.98……(10)
s305: and determining the target receiving power of each grid according to the first receiving power and the second receiving power of each grid.
In this step, for each mesh of the meshes, the following steps may be performed: the larger value of the first received power and the second received power is determined, and the larger value is determined as the target received power of the grid.
S306: and determining the radio protection area of the transmitter according to the target receiving power of each grid.
From the perspective of radio protection, the distance characteristic of the received power calculated by the propagation loss model must be larger than the actual measured value. If the received signal power is below the receiver noise level, it is not observable. Here, considering that the maximum transmission power is 40dBm, the guard area estimation may be separately performed.
In some embodiments, the grids in the grid network with the target received power greater than the received power threshold may be determined according to a preset received power threshold, and the boundary of the area formed by the grids may be determined as the boundary of the radio protection area of the transmitter.
Further, taking a base station as an example, according to the radio protection area of the base station, configuration parameters of the base station, such as transmission power and the like, may be set, so that interference with other base stations may be reduced.
According to the above-mentioned embodiments of the present application, on the one hand, single-edge diffraction is considered on the basis of a free space propagation model (FS), thereby improving the estimation performance of the radio protection area. For example, when the target received power rtargetAt-60 dBm, the normalized protection area of the conventional FS model and the conventional EH model are 100% and 56.22%, respectively, and with the embodiment of the present application, after single-edge diffraction is considered on the conventional free space propagation model (FS), 24.32% is reached, and the normalized protection area is reduced.
On the other hand, single-edge diffraction is considered on the basis of a free space propagation model (FS), and meanwhile, an expansion-Hata propagation model (EH model) is combined for calculation, so that the utilization efficiency of high frequency spectrum is improved, and reliable interference protection is realized. For example, when the target received power rtargetWhen the standard value is-80 dBm, the normalized protection area of the conventional FS model and the normalized protection area of the conventional EH model are 100% and 0.56%, respectively, and the normalized protection area of the embodiment of the present application reaches 0.52%. Realizes the efficient establishment of less than 1 percentThe radio protection zone of (1). Compared with the traditional FS model and the traditional EH model, the normalized protection area can be reduced by 99.48% and 0.04% respectively by the embodiment of the application.
In summary, the embodiments of the present application have efficient radio protection area estimation performance compared to calculating the protection area based on the FS model or the EH model. From the perspective of the required space, if only single-edge diffraction considered on the conventional free-space propagation model (FS) is adopted, 17dB of space is required, and only 4dB of space is required by the method of combining the conventional EH model while single-edge diffraction considered on the free-space propagation model (FS), the required area can be obviously reduced.
The following shows the results of actual radio propagation experiments performed using the embodiments of the present application.
Defining a normalized protection area AM(rtargetM) as an evaluation index of the radio protection area determination method. Normalized protection area aM(rtargetM) is calculated as:
wherein r istargetIs the target received power, m is the protection profit margin up to 100%, sM(rtargetM) is represented bytargetAnd M, the number of grids in the radio protection area when the method M is adopted. M is equal to { FS, EH, PF, P }, wherein FS represents a traditional free space propagation model (FS), EH represents an extended-Hata model (EH), PF represents a method for combining the free space propagation model (FS) with single-edge diffraction, and P represents a method provided by the embodiment of the application (shown as the scheme in the figure). The normalized guard area of method M represents the spectral efficiency of method M relative to the conventional FS model.
(1) The space required.
First, the space required to achieve 100% protection was evaluated for each method. FIG. 4 shows that when the target received power range is set to-80 dBm<＝rtarget<When equal to-60 dBmThe required space m. The conventional FS model enables 100% protection even when m is 0dB, since it calculates the excess protection area. Based on a traditional EH model, a method for combining a free space propagation model (FS) with single-blade edge diffraction is considered, and the embodiment of the application is carried out at rtargetAt-60 dBm, the maximum space m is 31dB, at rtargetAt-60 dBm, the maximum space m is 17dB, at rtargetAt-69 dBm, the maximum space m is 4 dB.
These maximum required margins are set as fixed margins, considering the practical use case, since each method needs to be easy to apply.
(2) A normalized protection zone.
As shown in fig. 5, at rtargetAt-60 dBm, the normalized guard area based on the conventional FS model and the conventional EH model are 100% and 56.22%, respectively, while the normalized guard area of the method after single-edge diffraction and the embodiment of the present application (shown as the present scheme) considered on the FS model are 24.32% and 24.86%, respectively.
Therefore, the normalized guard area can be reduced by 75.68% and 31.9% after single-edge diffraction is considered, compared to the conventional FS-based model and the conventional EH-based model, respectively. Compared with the traditional FS based model and the traditional EH based model, the embodiment of the application can reduce the protection area by 75.14% and 31.36%, respectively. When r istargetThe normalized protection zone areas for the conventional FS model and the conventional EH model are 100% and 0.56%, respectively, and the normalized protection zone areas for the single-edge diffraction and present solution are 0.65% and 0.52%, respectively, when-80 dBm is considered. Both proposed methods are efficient to establish less than 1% of the radio protection zone. Compared with the traditional FS model and the traditional EH model, the normalized protection area can be reduced by 99.48% and 0.04% respectively by the embodiment of the application.
Based on the same technical concept, the embodiment of the application also provides a radio protection area determining device.
Referring to fig. 6, a schematic structural diagram of a radio protection area determining apparatus provided in an embodiment of the present application is shown, where the apparatus may include: a free space propagation model calculation module 601, an extended-Hata propagation model calculation module 602, a target power determination module 603, a radio protection area determination module 604.
A free space propagation model calculation module 601, configured to determine, based on a free space propagation model, a first transmission loss from a transmitter to each mesh in a mesh network; determining a single-edge diffraction loss on a straight path from the transmitter to each grid according to a first transmission loss from the transmitter to each grid; determining a first received power of each grid according to the single-edge diffraction loss on a straight-line path from the transmitter to each grid;
an extended-Hata propagation model calculation module 602, configured to determine a second transmission loss from the transmitter to each grid based on the extended-Hata propagation model, and determine a second received power of each grid according to the second transmission loss from the transmitter to each grid;
a target power determining module 603, configured to determine a target received power of each grid according to the first received power and the second received power of each grid;
a radio protection area determining module 604, configured to determine a radio protection area of the transmitter according to the target received power of each mesh.
Optionally, the free space propagation model calculation module 601 is specifically configured to: determining distances between the transmitters and the grids, respectively; determining a first transmission loss from the transmitter to each grid according to the distance between the transmitter and each grid; wherein, the distance between the transmitter and any one of the grids satisfies the above formula (5), and the first transmission loss from the transmitter to any one of the grids satisfies the above formula (6).
Optionally, the single-edge diffraction loss on the straight-line path from the transmitter to any one of the grids satisfies the above formula (4).
Optionally, the first received power of any one of the grids satisfies the above equation (6).
Optionally, the target power determining module 603 is specifically configured to: for each of the meshes, performing the steps of: determining a larger value among the first and second reception powers, the larger value being determined as a target reception power.
Based on the same technical concept, the embodiment of the present application further provides a communication apparatus, which is capable of implementing the radio protection area determining method in the foregoing embodiment.
Fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application. As shown, the apparatus may comprise: a processor 701, a memory 702, and a bus interface 703.
The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 in performing operations.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 701, and various circuits, represented by memory 702, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 701 is responsible for managing the bus architecture and general processing, and the memory 702 may store data used by the processor 701 in performing operations.
The processes disclosed in the embodiments of the present application may be applied to the processor 701, or implemented by the processor 701. In implementation, the steps of the process flow may be performed by instructions in the form of hardware integrated logic circuits or software in the processor 701. The processor 701 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 702, and the processor 701 reads the information in the memory 702, and completes the steps of the method flow in the embodiment of the present application in combination with the hardware thereof.
Specifically, the processor 701 is configured to read the computer instructions in the memory 702 and execute the radio protection area determining method in the embodiment of the present application.
It should be noted that, the communication apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.
The embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to execute the radio protection area determining method in the foregoing embodiment.
The embodiment of the present application further provides a computer program product, which when called by a computer, causes the computer to execute the radio protection area determining method in the above embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (13)
1. A radio protection area determination method, comprising:
determining a first transmission loss from a transmitter to each grid in the grid network based on a free space propagation model;
determining a single-edge diffraction loss on a straight path from the transmitter to each grid according to a first transmission loss from the transmitter to each grid;
determining a first received power of each grid according to the single-edge diffraction loss on a straight-line path from the transmitter to each grid;
determining a second transmission loss from the transmitter to each grid based on an extended Hata propagation model, and determining a second received power of each grid according to the second transmission loss from the transmitter to each grid;
determining the target receiving power of each grid according to the first receiving power and the second receiving power of each grid;
and determining the radio protection area of the transmitter according to the target receiving power of each grid.
2. The method of claim 1, wherein determining a first transmission loss of a transmitter to each mesh in a mesh network based on a free space propagation model comprises:
determining distances between the transmitters and the grids, respectively;
determining a first transmission loss from the transmitter to each grid according to the distance between the transmitter and each grid;
wherein, the distance between the transmitter and any one of the grids satisfies the following formula:
d＝R·arccos{sinφ1sinφ2+cosφ1cosφ2cos(λ1-λ2)}
where d is the first transmission loss, R is the radius of the earth, and the spherical coordinate of the position of the transmitter is (phi)1，λ1) The spherical coordinate of the central point of the grid is (phi)2，λ2)；
A first transmission loss from the transmitter to any one of the grids satisfies the following equation:
L＝32.45+20log(d)+20log(f)
where L is the first transmission loss, f is the frequency of the signal transmitted by the transmitter, and d is the distance of the transmitter from the grid.
3. The method of claim 1, wherein the single-edge diffraction loss on the straight-line path from the transmitter to any one of the grids satisfies the following equation:
wherein J (v) represents a single-edge diffraction loss, d1Distance of transmitting antenna to single-edged edge, d2The distance from the receiving antenna to the single-blade edge is defined as h, the height or the depth of the single-blade edge from the transmitting antenna to a connecting line of the receiving antenna is defined as h, and lambda represents the wavelength; when upsilon is<When J (ν) ≈ 0.78, J (ν) ≈ 0.
4. The method of claim 1, wherein the first received power for any one of the grids satisfies the following equation:
pr＝pt-20logd-20log(f)+242-L-J(v)
wherein p isrRepresenting received power, ptDenotes transmission power, j (v) denotes single-edge diffraction loss, f is frequency, d is distance between receiver and transmitter, and L denotes first transmission loss.
5. The method of any of claims 1-4, wherein determining the target received power for the respective grid based on the first received power and the second received power for the respective grid comprises:
for each of the meshes, performing the steps of:
determining a larger value among the first and second reception powers, the larger value being determined as a target reception power.
6. A radio protection area estimation apparatus, comprising:
the free space propagation model calculation module is used for determining first transmission loss from the transmitter to each grid in the grid network based on the free space propagation model; determining a single-edge diffraction loss on a straight path from the transmitter to each grid according to a first transmission loss from the transmitter to each grid; determining a first received power of each grid according to the single-edge diffraction loss on a straight-line path from the transmitter to each grid;
an extended-Hata propagation model calculation module, configured to determine, based on the extended-Hata propagation model, second transmission losses from the transmitter to the grids, and determine, according to the second transmission losses from the transmitter to the grids, second received powers of the grids;
a target power determining module, configured to determine a target received power of each grid according to the first received power and the second received power of each grid;
and a radio protection area determining module, configured to determine a radio protection area of the transmitter according to the target received power of each mesh.
7. The apparatus of claim 6, wherein the free-space propagation model computation module is specifically configured to:
determining distances between the transmitters and the grids, respectively;
determining a first transmission loss from the transmitter to each grid according to the distance between the transmitter and each grid;
wherein, the distance between the transmitter and any one of the grids satisfies the following formula:
d＝R·arccos{sinφ1sinφ2+cosφ1cosφ2cos(λ1-λ2)}
where d is the first transmission loss, R is the radius of the earth, and the spherical coordinate of the position of the transmitter is (phi)1，λ1) The spherical coordinate of the central point of the grid is (phi)2，λ2)；
A first transmission loss from the transmitter to any one of the grids satisfies the following equation:
L＝32.45+20log(d)+20log(f)
where L is the first transmission loss, f is the frequency of the signal transmitted by the transmitter, and d is the distance of the transmitter from the grid.
8. The apparatus of claim 6, wherein the single-edge diffraction loss on the straight-line path from the transmitter to any one of the grids satisfies the following equation:
wherein J (v) represents a single-edge diffraction loss, d1Distance of transmitting antenna to single-edged edge, d2The distance from the receiving antenna to the single-blade edge is defined as h, the height or the depth of the single-blade edge from the transmitting antenna to a connecting line of the receiving antenna is defined as h, and lambda represents the wavelength; when upsilon is<When J (ν) ≈ 0.78, J (ν) ≈ 0.
9. The apparatus of claim 6, wherein the first received power for any one of the grids satisfies the following equation:
pr＝pt-20logd-20log(f)+242-L-J(v)
wherein p isrRepresenting received power, ptDenotes transmission power, j (v) denotes single-edge diffraction loss, f is frequency, d is distance between receiver and transmitter, and L denotes first transmission loss.
10. The apparatus of any one of claims 6-9, wherein the target power determination module is specifically configured to:
for each of the meshes, performing the steps of:
determining a larger value among the first and second reception powers, the larger value being determined as a target reception power.
11. A communications apparatus, comprising: a processor, a memory;
the memory storing computer instructions;
the processor, reading the computer instructions, performing the method of any one of claims 1-5.
12. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1-5.
13. A computer program product, which, when called by a computer, causes the computer to perform the method of any one of claims 1 to 5.
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