CN108712749B - Method and system for covering strait mobile broadband - Google Patents
Method and system for covering strait mobile broadband Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a system for covering a strait mobile broadband, wherein the method comprises the following steps: after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station; acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold; and sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell. According to the method and the system for covering the strait mobile broadband, the frequency band is allocated for the cell needing additional communication resources by dynamically adjusting the frequency band allocation mode of each cell in the strait, so that the covering capability and the service quality of each cell in the strait are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of offshore mobile broadband communication, in particular to a method and a system for covering a strait mobile broadband.
Background
With the continuous development of marine economy in China, more and more workers participate in maritime activities such as travel, transportation, fishing in fishery, marine monitoring and the like. In order to ensure the safety and efficiency of offshore water area operation and improve the information quality of life of people at sea, the marine broadband communication system becomes an essential infrastructure for maritime activities. Particularly, in a relatively narrow strait water area, such as the Bohai strait, Taiwan strait, Johnson strait and the like in China, ships are densely distributed, and the requirement of large-capacity high-density over-water broadband communication exists. As an important component of offshore waters, the strait waters are demanding economic and efficient broadband coverage solutions.
Currently, traditional wireless communication means available for strait scenarios include radio systems (MF/HF/VHF), maritime satellite phones, and shore-based LTE/WiMAX networks, among others. These several communication methods have advantages and disadvantages in terms of coverage, bandwidth performance, and price of use. The communication mode based on MF/HF/VHF can provide long-distance/medium-distance/short-distance ship-to-ship communication and ship-shore communication, plays an important role in the field of marine safety such as tsunami early warning, and the like, but can only provide narrow-band communication. The maritime satellite can cover the whole world, and the use of a maritime satellite telephone requires that a receiving device of the maritime satellite is installed on a ship, but the problems of high communication price and insufficient bandwidth exist in the scene of the strait communication. Based on a communication mode for deploying a shore-based LTE/WiMAX network, the method can provide channel coverage of tens of kilometers in a coverage range and provide relatively considerable bandwidth; and because the base station is established on the two sides of the strait, the maintenance cost and the use cost of the base station also have obvious advantages compared with the former two modes. However, due to the network planning method and the fact that a base station cannot be established on the water surface, the traditional cell-based method for covering the strait water area has the disadvantages that the density of users which can be supported by the strait key routes is limited, and the bandwidth which can be allocated by a single user is relatively limited.
There is thus a need for a method of mobile broadband coverage of straits that addresses the above problems.
Disclosure of Invention
To address the above problems, embodiments of the present invention provide a method and system for mobile broadband coverage of strait that overcomes, or at least partially solves, the above problems.
In a first aspect, an embodiment of the present invention provides a method for mobile broadband coverage of a strait, including:
after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station;
acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold;
and sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
In a second aspect, an embodiment of the present invention provides a method for mobile broadband coverage of straits, including:
after reporting the position information of the base station, receiving a first class frequency band allocation scheme sent by a server;
after the first-class frequency band allocation scheme is allocated, the communication resource requirements of the cells corresponding to the base station are sent to a server, so that the server can determine the target cell of which the communication resource requirements are greater than a preset threshold value;
and after receiving a second frequency band allocation scheme sent by a server, adjusting antenna parameters based on the second frequency band allocation scheme so as to meet the mobile broadband coverage requirement of the target cell.
In a third aspect, an embodiment of the present invention provides a mobile broadband coverage system for straits, the system comprising:
the first frequency band allocation module is used for receiving base station position information reported by each base station preset in the strait and then sending a first class of frequency band allocation scheme to each base station;
a determining module, configured to obtain communication resource requirements of each cell corresponding to each base station after being allocated according to the first class frequency allocation scheme, and determine a target cell for which the communication resource requirements are greater than a preset threshold;
and the second frequency band allocation module is used for sending a second frequency band allocation scheme to the target base station corresponding to the target cell, so that the target base station adjusts the antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
A fourth aspect of an embodiment of the present invention provides a strait mobile broadband coverage device, comprising:
a processor, a memory, a communication interface, and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the strait mobile broadband coverage method described above.
A fourth aspect of the present invention provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the above method.
According to the method and the system for covering the strait mobile broadband, the frequency band is allocated for the cell needing additional communication resources by dynamically adjusting the frequency band allocation mode of each cell in the strait, so that the covering capability and the service quality of each cell in the strait are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for mobile broadband coverage of straits according to an embodiment of the present invention;
fig. 2 is a schematic diagram of rectangular cells of different widths provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a rectangular cell according to an embodiment of the present invention;
fig. 4 is a graph comparing the path loss of a conventional antenna cell with the edge of a rectangular cell according to an embodiment of the present invention;
fig. 5 is a schematic diagram of shadow zones according to a conventional antenna cell sector shoreside arrangement provided by an embodiment of the present invention.
FIG. 6 is a flow chart of another method for mobile broadband coverage of straits according to an embodiment of the present invention;
fig. 7 is a schematic diagram comparing user average path loss provided by the embodiment of the present invention;
FIG. 8 is a block diagram of a strait mobile broadband coverage system according to an embodiment of the present invention;
fig. 9 is a block diagram of a structure of a strait mobile broadband coverage device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention simulates the wide-band coverage scheme of the strait provided by the prior art, the simulation is based on an Atoll network planning tool, the traditional antenna LTE base station is deployed along two sides of the strait in the Johnson State, and the simulation parameter setting is shown in Table 1:
TABLE 1 Atoll simulation parameters Table
Simulation results show that under a coverage mode based on the traditional cell, the area with the upward peak rate of less than 256kbps in the water area of the Johnson channel exceeds 74%, and the area with the downward peak rate of less than 1024kbps exceeds 83%. When the technical means such as using an ultra-high antenna, increasing the transmitter power and using a high-gain antenna are not used, the actual bandwidths of other users are very limited except for the near-shore user. The coverage mode based on the traditional cell has small coverage and insufficient user capacity, and is difficult to meet the broadband communication requirement of the strait water area.
In the prior art, technologies such as a base station amplifier and frequency optimization are used, and a traditional ground LTE covering method is combined, so that a wireless communication broadband network covering method for an air route airway is provided. The specific measures are that the antenna hanging height is increased, a high-gain base station antenna is adopted, and the equipment power is increased as a hardware measure; and meanwhile, frequency optimization is adopted, neighbor cells and switching/access parameters are perfected, and frequency bands suitable for sea surface long-distance transmission and the like are used as software means.
However, most of the improvement ideas provided by the prior art are based on power boosting and frequency selection to perform corresponding specialized adjustment so as to improve the effective signal coverage strength on the sea surface, further improve the communication quality of users, and finally solve the communication problems caused by factors such as too long communication distance and incapability of arranging base stations on the sea surface. However, in an actual strait scene, the communication loads of the two shore base stations are greatly different in space and time, and the improvement idea is not completely applicable. Thousands of passengers on a large tanker are orders of magnitude different from tens of crews on a small boat, with large variations and great imbalances in the loading between base stations as they pass through the channel. In addition, a situation that a large number of users occupy communication resources intensively in a sudden manner often occurs on an airline, for example, a large number of emergency communication demands caused by sudden weather such as a sudden sea storm and the like cause insufficient real-time available communication capacity, and the load difference of the same base station at different times is also large. Therefore, the dynamic diverse strait mobile broadband communication requirements cannot be met only by means of power increase and the like, and the problems of radiation increment, equipment loss, energy waste and the like caused by using a high-power base station are questioned.
In view of the above problems in the prior art, fig. 1 is a flowchart of a method for mobile broadband coverage of strait, according to an embodiment of the present invention, as shown in fig. 1, the method includes:
s1, after receiving base station position information reported by each base station preset in the channel, sending the first-class frequency band allocation scheme to each base station;
s2, acquiring the communication resource requirements of each cell corresponding to each base station after being allocated according to the first-class frequency band allocation scheme, and determining a target cell of which the communication resource requirements are greater than a preset threshold;
and S3, sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
It should be noted that the main execution entity of the embodiment of the present invention is a backbone network server, and may also be any entity or virtual device that implements the server function, which is not limited to the embodiment of the present invention.
The method for covering the strait mobile broadband provided by the embodiment of the invention can be divided into two parts, namely an initialization covering process of step S1 and a dynamic covering process of steps S2-S3, and for the convenience of understanding the embodiment of the invention, the following description is made in the embodiment of the invention:
in the embodiment of the present invention, it is assumed that the initialization time is t0The strait sea area comprises M users needing service, N shaped antenna base stations and K available frequency bands. Wherein K>And N is added. The base station set is N ═ N n1,2, …, N }. The set of available frequency bands is F ═ FfI F is 1,2, …, F, and the bin number is j. The user set is A ═ Aa|a＝1,2,...,N}，AaThe total number of users | a | satisfies | a | ═ M, representing the number of users served by the a-th base station. The final frequency band allocation scheme is E ═ Ee|e＝1,2,...,N}，EeRepresenting the number of frequency bins allocated by the e-th base station. Before the initial coverage is started, all cells are not allocated with frequency bands, and a plurality of users needing service exist on the sea surface.
In step S1, it can be understood that, in the embodiment of the present invention, a plurality of base stations are disposed in the strait, and the specific base station arrangement may be performed according to a demand distribution map of the strait broadband communication service, specifically, along two sides of the strait from west to east, with reference to historical average statistical data, a main airline and a main economic area are mainly considered. In principle, one base station is arranged per rectangular area of 800 to 1000 users to be served. The main radiation directions of the shaped antennas of the base stations are basically kept parallel, the cells served by the base stations are arranged to be rectangular, the central line of the strait is taken as a symmetry axis, the two sides are distributed in a staggered mode, and the base stations are marked in sequence from west to east. Under special conditions such as large user density difference, the density of base stations on both sides of the strait can be properly adjusted to meet actual needs. Each base station selects a proper horizontal beam width, for example, the horizontal beam width is between 5 ° and 30 ° to complete the coverage of the rectangular area of the cell to which the base station belongs.
When the base station shaped antenna is further specifically arranged, the parameter requirement of the base station shaped antenna needs to meet the requirement that no blind area with serious poor communication quality exists between adjacent cells, such as a cell with effective signal strength lower than-105 dBm, and the embodiment of the invention also allows the adjacent base station cells to have small overlapping coverage areas.
After the base station completes the fixed point arrangement, the position is not changed. It should be noted that the base station equipment is matched with a TD-LTE communication protocol, and parameters such as a corresponding shaped antenna frequency point, a power amplifier and the like are configured according to the TD-LTE standard.
In step S1, after the preset position of each base station is determined, the embodiment of the present invention needs to initially allocate a frequency band for each base station, and it can be understood that, in the embodiment of the present invention, all available frequency bands are divided into a first frequency band and a second frequency band, where the first frequency band is used for completing initialization of frequency band allocation to achieve a frequency band allocated when a service area is fully covered, and may also be referred to as a basic frequency band in the embodiment of the present invention, and the second frequency band is a frequency band left for dynamic allocation after the full coverage is completed, and may also be referred to as a dynamic frequency band in the embodiment of the present invention. It should be understood that the number of frequency bands included in the first type of frequency band or the second type of frequency band is not specifically limited in the embodiments of the present invention.
Correspondingly, the first type of frequency band allocation scheme is an initial frequency band allocation scheme established by the server for each base station, and the second type of frequency band allocation scheme is a dynamic frequency band allocation scheme subsequently established by the server for each cell with a high communication resource demand.
It can be understood that, after the first class frequency band is allocated to each cell in step S1, the broadband coverage of each cell can be substantially guaranteed, but when the communication resources of some cells are in short or additional communication resources are needed, and the allocated first class frequency band is not enough to meet the requirement, the second class frequency band needs to be allocated, so as to improve the service quality of the cell.
Then, in step S2, after the first-class frequency band is initially allocated, the embodiment of the present invention obtains the communication resource requirement of each cell, and the obtaining manner is conventional, and the base station can periodically report the number of users to be served in the cell corresponding to the base station, so as to determine the target cell whose communication resource requirement is higher than the preset threshold, preferably, the preset threshold provided by the embodiment of the present invention is 90%.
Further, in step S3, in the embodiment of the present invention, a second type frequency band except for the first type frequency band is allocated to the target cell, and the frequency band allocation scheme is that the embodiment of the present invention provides that, in the embodiment of the present invention, the number of the target cells may not be unique, and then, according to a certain allocation rule, each target cell needs to be allocated with the second type frequency band.
According to the method and the system for covering the strait mobile broadband, the frequency band is allocated for the cell needing additional communication resources by dynamically adjusting the frequency band allocation mode of each cell in the strait, so that the covering capability and the service quality of each cell in the strait are improved.
On the basis of the above embodiment, each base station preset in the strait is a shaped antenna base station, and correspondingly, each cell corresponding to each base station is a rectangular cellular cell.
Different from the prior art, the base station provided in the embodiment of the present invention is a shaped antenna base station, and each cell is divided into a plurality of rectangular cellular cells with different rectangular widths according to user density, fig. 2 is a schematic diagram of the rectangular cellular cells with different widths provided in the embodiment of the present invention, referring to fig. 2, the rectangular cell scheme provided in the embodiment of the present invention is to employ a high-gain shaped antenna, transmitted energy is more directional and concentrated, and the width of the rectangular cell can be controlled by setting the horizontal beam width (5 ° -30 °) of the shaped antenna of the base station. In practice, the allocation may be based on the actual user distribution density. For example, a cell is set for every 1000 users, and a suitable beam width of the shaped antenna is selected to ensure that the 1000 users are covered and minimum interference is generated to adjacent cells.
Under the condition of the same total power, the width of the rectangular cell can be reasonably designed according to the user density. For example, narrow rectangular cells may be configured for high density user areas such as important waterways, and wide rectangular cells may be configured for low density user areas such as fishery economy areas. The rectangular cell can obtain a more flexible coverage area, improve the signal strength of the strait water area and optimize the communication quality.
It can be understood that, in the conventional terrestrial LTE cell model, to expand the coverage, a series of energy indexes such as the signal strength and the receiver sensitivity of the base station must be improved. The total bandwidth available for each base station in its coverage area is limited, and assuming that the total bandwidth is M, and the number of users in the coverage area of the base station is N, the average bandwidth available for each user is M/N. The design that the traditional LTE cell uses the macro-cell adopts a fan-shaped beam antenna with a large angle to cover the strait water area, the coverage area of a single cell is large and is limited by a radio frequency condition, the total data transmission rate of the whole cell can be reduced, and the actual total bandwidth M' is reduced. Meanwhile, since the coverage area of a single cell is large, the frequency reuse times are reduced under the condition of the same total coverage area, the number N' of actual users to be served in the single cell is increased, and the data transmission rate which can be allocated to a single user is also limited. The above two reasons would be the average bandwidth actually allocated to each user
Decrease, possibly much lower than expected
In addition, in order to realize such a macro cellular structure, a high-power antenna or the like must be used to ensure the communication quality of the remote user, and a high requirement is imposed on the base station equipment. In strait communications, for vessels carrying a large number of users, such as tankers, sailing along a given route, especially when only one cell covers the navigationIn busy areas of the line, the bandwidth available to a single user will be very limited and the user quality of service will drop dramatically.
However, the rectangular Cell adopted in the embodiment of the present invention can effectively solve the problem, the base station of the rectangular Cell is located on the long straight edge of the coast, the coverage width of the Cell can be appropriately adjusted according to the real-time user capacity in practical application, and referring to fig. 2, it is assumed that a Cell-3 Cell covers a key channel with heavy traffic, the distribution density of users in the Cell is higher, and a Cell-9 Cell covers a traditional economic area, and the distribution density of users in the Cell is lower. In view of this difference, Cell-3 cells may be designed to be relatively narrow (width h3) and Cell-9 cells may be designed to be relatively wide (width h 9). Single-user average bandwidth in cell is improved by reducing cell coverage area and reducing number N of users in cell
Meanwhile, when a narrower cell is used, more base stations can be deployed on the coastline with the same length, more cells are divided, the frequency reuse times are increased, the total bandwidth M in the cells is increased, and the average bandwidth of a single user is further increased
Furthermore, the scheme provided by the embodiment of the invention can also improve the edge power, so that the signal intensity of the edge of the adjacent cell can be obviously improved, and a coverage blind area is avoided.
It can be appreciated that, at the same power, the cell edge of the conventional sector beam antenna cell is approximately the same distance from the central base station, and the signal strength of the edge users is limited by the distance from the central base station, resulting in limited actual capacity of the edge users. As shown in fig. 3, the four sides AB, BC, CD, DA of the rectangular cell are not equal, and only the opposite side AD of the base station in the four sides may cause the user signal strength to be limited by the distance and the transmission power. The other three edges BC, AB and CD, BC located on the coastline can be reinforced with the traditional LTE, and AB and CD are connected with the adjacent cells on the same bank. In a simple way, the signal strength of the edge users at the AB and CD sides decreases with the increase of the distance between the user and the base station, most of the edge users are not limited by the distance, the signal power can be improved, and the service quality of the user can be improved accordingly.
According to the path loss formula of signals propagating on the sea surface:
wherein λ is the wavelength, Ht、HrAre respectively a base station BiAnd user UjD is the distance between the two, LboatFor losses of electromagnetic waves through the hull, LearthA is a correction coefficient, which is a diffraction loss due to the curvature of the earth. The path loss conditions of the lower edge users in the two coverage modes are calculated by Matlab simulation, and referring to fig. 4, it can be obviously seen that the path loss of the rectangular cell on the two edges of 0-60 degrees and 120-180 degrees is obviously less than that of the traditional sector beam antenna cell. Due to the use of shaped antennas, the signal strength at the edges of rectangular cells, especially at the edges of cells adjacent to the same bank, can be significantly improved.
Meanwhile, it should be noted that, while a coverage hole may be generated by sector antenna coverage of a conventional shore-based base station, referring to fig. 5, a coverage hole of a triangle may be generated between coverage sectors of a B0 base station and a B1 base station. The traditional method also needs additional processing aiming at the blind area, and a base station is supplemented between the blind areas to meet the requirement. The rectangular base station provided by the embodiment of the invention can avoid the problem, and the base station which is closely arranged can completely cover the blind area without additional processing.
On the basis of the foregoing embodiment, after receiving base station location information reported by each base station preset in the strait, the method for transmitting a first class frequency allocation scheme to each base station specifically includes:
after receiving base station position information reported by each base station preset in the strait, acquiring a position relation matrix of a cell corresponding to the base station;
establishing a base station ranking table based on the position relation matrix of the cell corresponding to the base station, wherein the base station ranking table is ranked according to the number of adjacent base stations from large to small;
and formulating a first-class frequency band allocation scheme based on the base station sequencing list, and sending the first-class frequency band allocation scheme to each base station, wherein the first-class frequency band allocation scheme is used for sequentially allocating one of the first-class frequency bands to each base station according to the sequence of each base station in the base station sequencing list so as to ensure that any two adjacent base stations do not share the same frequency band.
The position relation matrix of the corresponding cell of the base station is as follows:
wherein i and j are base station numbers, bi,j＝{1or0}，bi,jWhen the number is 1, the geographic positions of cells corresponding to the ith base station and the jth base station are adjacent, bi,jAnd when the value is 0, the geographic positions of the cells corresponding to the ith base station and the jth base station are not adjacent.
It can be understood that, in order to ensure that no blind area or gap exists between adjacent cells, in a specific physical implementation process, a phenomenon that beam coverage areas are partially overlapped is inevitably generated, but if adjacent cells adopt the same frequency band, same frequency interference is inevitably generated, and in order to avoid the same frequency interference as much as possible and save frequency band resources as much as possible, the embodiment of the invention adopts a DSATUR algorithm to multiplex a plurality of cells with fewer frequency bands, thereby realizing initialization coverage of all cells.
First, according to the location information of each cell, the embodiment of the present invention establishes a cell location relationship matrix between cells
Wherein, i and j are cell base station node numbers and traverse all base stations on both sides. When B is equal to BTIt is a symmetric array. b i,j1 indicates that the geographical positions of the ith and jth cell base stations are adjacent, and 0 indicates that the two cell base stations are not adjacentThe geographic locations are spaced apart. Special cases when i ═ j, bi,j＝1。
Taking fig. 2 as an example, the corresponding matrix is:
when b isi,jWhen i ≠ j and 1, it will cause serious mutual interference if two cell base stations i and j use the same frequency band.
Further, in the embodiment of the present invention, a base station ranking table is established according to the mutual interference matrix B, as shown in table 2.
Table 2 base station sequencing table
| Cell number | 8 | 3,4,5,6,7 | 2,9,10 | 1,11 |
| Number of adjacent cells | 5 | 4 | 3 | 2 |
In table 2, each cell is sorted according to the number of neighboring cells from large to small, and then the frequency band is distributed through multiple iterations, so that any two neighboring base stations do not share the same frequency band.
Can be understoodThat is, the base station with the largest number of base stations which can be interfered, that is, the base station with the largest number of base stations of the adjacent cell, that is, ∑, is selectedi|bi,jIf ∑ exists, allocating a frequency band with the minimum available serial number to the base station to ensure that the frequency bands between adjacent base stations are different and will not generate interferencei|bi,jAnd if the base stations are the same, randomly selecting one of the base stations to operate. This operation is repeated until all cell sites have a base band, ieiAnd the frequency band is different between adjacent base stations, so that the availability is ensured.
Taking fig. 2 as an example, the specific iterative process is as follows:
for the first iteration, the No. 1 frequency band is distributed to a cell 8;
for the second iteration, one of the cells 3, 4, 5, 6 and 7 is randomly selected, and in the embodiment of the invention, the cell 4 is taken as an example, and the frequency band No. 1 is allocated to the cell 4;
in the third iteration, the remaining cell in the second iteration is randomly selected, the cell 6 is taken as an example in the embodiment of the present invention, and since the adjacent cells 4 and 8 are both allocated with the frequency band No. 1, the frequency band No. 2 can only be allocated to the cell 6 at this time;
in the embodiment of the present invention, the cell 7 is taken as an example, because the adjacent cells 8 are all allocated with the frequency band No. 1, and the adjacent cell 6 is allocated with the frequency band No. 2, only the frequency band No. 3 can be allocated to the cell 6 at this time;
in the embodiment of the present invention, the cell 5 is taken as an example, because the adjacent cell 4 is allocated with the frequency band No. 1, the adjacent cell 6 is allocated with the frequency band No. 2, and the adjacent cell 7 is allocated with the frequency band No. 3, only the frequency band No. 4 can be allocated to the cell 5 at this time;
in the sixth iteration, the condition that the number of the adjacent cells is the most and only the remaining cells 3 are not allocated is met, because the adjacent cell 4 is allocated with the frequency band No. 1 and the adjacent cell 5 is allocated with the frequency band No. 4, only the frequency band No. 2 can be allocated to the cell 3;
in the embodiment of the present invention, the cell 2 is taken as an example, because the adjacent cell 4 is allocated with the frequency band No. 1, and the adjacent cell 3 is allocated with the frequency band No. 2, only the frequency band No. 3 can be allocated to the cell 2 at this time;
in the eighth iteration, one of the cells 9 and 10 remaining in the seventh iteration is selected, and in the embodiment of the invention, the cell 9 is taken as an example, and since the adjacent cell 7 is allocated with the 3 rd frequency band and the adjacent cell 8 is allocated with the 1 st frequency band, only the 2 nd frequency band can be allocated to the cell 9 at this time;
in the ninth iteration, the cells 10 remaining in the eighth iteration are selected, and because the adjacent cell 8 is allocated with the 2 nd frequency band and the adjacent cell 8 is allocated with the 1 st frequency band, only the 3 rd frequency band can be allocated to the cell 10 at the moment;
in the tenth iteration, one of the cells 1 and 11 is randomly selected, and in the embodiment of the invention, the cell 1 is taken as an example, because the adjacent cell 2 is allocated with the 3 rd frequency band and the adjacent cell 3 is allocated with the 2 nd frequency band, only the 1 st frequency band can be allocated to the cell 1 at this time;
in the eleventh iteration, the cells 11 remaining in the tenth iteration are selected, and because the adjacent cell 8 is allocated with the 2 nd frequency band and the adjacent cell 10 is allocated with the 3 rd frequency band, only the 1 st frequency band can be allocated to the cells 11 at the moment;
at this time, a total of 4 frequency bands are used, so that the full coverage of all eleven cells is completed, each cell has one frequency band, and the frequency bands of any two adjacent cells are different. The frequency band is utilized with the basic maximum efficiency, and the actual requirements on the frequency band are met. The final first type frequency band allocation results are shown in table 3.
TABLE 3 first-class frequency band Allocation Table
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Frequency band |
1 | 3 | 2 | 1 | 4 | 2 | 3 | 1 | 2 | 3 | 1 |
Then, through the above process, the embodiment of the present invention can implement allocation of the initialization frequency band for each cell, and correspondingly complete initialization coverage.
On the basis of the foregoing embodiment, the acquiring the communication resource demand of the cell corresponding to each base station after being allocated according to the first-class frequency allocation scheme, and determining the target cell whose communication resource demand is greater than the preset threshold specifically includes:
periodically acquiring the number of service users in each cell corresponding to each base station after the allocation according to the first-class frequency band allocation scheme;
and for any period, acquiring the communication resource requirement of each cell based on the number of service users in each cell, and taking the cell with the communication resource requirement larger than a preset threshold value as a corresponding target cell in the period.
On the basis of the foregoing embodiment, if there are multiple target cells, the sending a second-class frequency band allocation scheme to a target base station corresponding to the target cell is performed, so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet a mobile broadband coverage requirement of the target cell, which specifically includes:
acquiring the number of service users in each target cell, and calculating the ratio of the number of the service users between the target cells;
and formulating a second-class frequency band allocation scheme according to the proportion of the number of the service users, and sending the second-class frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
It can be understood that the process of dynamically allocating the second-class frequency band according to the embodiment of the present invention is a periodic adjustment process, and the process is performed every Δ T1The time is to obtain the number of service users in each cell once, so as to obtain a real-time user set A according to the actual number of service users reported by each base station, thereby updating the user set in the existing strait, and forming the user set A from all the elements with the used communication resource proportion higher than 90% in the ASThereby allocating the second type of frequency band to ASAnd corresponding target cells enable the base station to perform service according to the allocation scheme.
The embodiment of the present invention preferably provides that the number of users in different cells is proportionally rounded according to the ratio of service users included in different cells, and then the frequency band in the second frequency band is allocated to each cell according to the ratio.
Fig. 6 is a flowchart of another method for mobile broadband coverage of strait according to an embodiment of the present invention, as shown in fig. 6, including:
101. after reporting the position information of the base station, receiving a first class frequency band allocation scheme sent by a server;
102. after the first-class frequency band allocation scheme is allocated, the communication resource requirements of the cells corresponding to the base station are sent to a server, so that the server can determine the target cell of which the communication resource requirements are greater than a preset threshold value;
103. and after receiving a second frequency band allocation scheme sent by a server, adjusting antenna parameters based on the second frequency band allocation scheme so as to meet the mobile broadband coverage requirement of the target cell.
It should be noted that the execution subject of the embodiment of the present invention is each base station node, and each base station node corresponds to a base station actually arranged on both sides of the strait one to one, so as to implement broadband communication with the user.
In step 101, each base station node provided in the embodiment of the present invention reports the position of each corresponding base station to the backbone network server, so that the backbone network server can formulate a corresponding first class frequency band allocation scheme.
In step 102, after receiving the first class frequency allocation scheme sent by the backbone network server, the base station node completes initial frequency allocation to the cell corresponding to each base station, and then reports the number of service users in the cell to the server for the server to acquire the communication resource requirement of the cell.
In step 103, after the target base station node acquires the second-class frequency band allocation scheme, the antenna parameters of the base station need to be adjusted accordingly, so as to meet the service requirements of the client.
Specifically, the antenna parameters of the base station provided in the embodiment of the present invention at least include a dynamically adjusted radiation phase, an antenna transmission power, and a downlink angle, and each base station node continues to periodically collect coordinate information of a user while serving the user, so as to periodically report information to a backbone network server.
Correspondingly, in the whole process, if the user terminal needs the broadband communication service, the user terminal needs to send a service request to the base station node and send the position of the user terminal to the base station node. In the whole dynamic operation process, the user client can be divided into four states of entering a cell, serving the cell, switching the cell and exiting the service.
The cell entering state refers to a state that a user client enters a user cell and requests service; the cell service state refers to a state in which a user is receiving the service of a single base station; the cell switching state refers to a state that a user client is switched from one cell A to another cell B; an out-of-service state refers to a state in which a user client is out of service.
When entering a cell, a user broadcasts the service requirement and position information of the user, establishes a service communication link after obtaining feedback of a certain base station, and shifts to a cell service state; the user client periodically sends self position information in a cell service state, and performs communication service interaction with a cell base station in which the user client is located; when a user client enters an overlapping area covered by a cell due to position change, the user client keeps periodically sending self position information and carries out communication service interaction with a base station closest to the user client; when the user exits the service, the user client sends out a service stop message to the base station, and stops sending the position information.
On the basis of all the embodiments, the embodiment of the invention simulates the provided strait mobile broadband coverage method, an Atoll network planning tool is adopted in the embodiment of the invention, the simulation parameter setting is the same as that of the table 1, and the table 4 shows the effective signal coverage rate of the antenna.
TABLE 4 effective antenna signal coverage
As can be seen from table 4, the conventional antenna has an effective coverage area of only 16%, and there is a case where a large signal is less than-105 dBm, whereas the effective signal coverage of the antenna cell provided by the embodiment of the present invention can reach 98%.
Furthermore, the actual ship navigation data in the offshore area of the sea gorge in Qiongzhou of China from 10 months and 22 days in 2015 to 10 months and 28 days in 2015 is taken as the analysis basis. Rectangular regions formed by (E109.95 °, N22.33 °) and (E110.95 °, N19.88 °) were calculated. And dividing the original data by taking the ship single communication as a basic data element in an hourly unit. The data includes ship codes, communication time and longitude and latitude coordinates. Rectangular cell base stations are deployed within the selected area according to the base station deployment principles described above. Because the operation speed of the sea-surface ship is slow, the channel coherence time is long, and the data of nearly 170 points can be obtained by taking one hour as a time interval, which is more representative. The average path loss of the users in each hour within seven consecutive days (168 hours) is calculated, and compared with the path loss of the traditional cell base station, referring to fig. 7, compared with the traditional mode, the average path loss of the users in the rectangular cell is lower than that of the users in the traditional cell, and the difference value is generally 3 dB.
Fig. 8 is a structural view of a strait mobile broadband coverage system according to an embodiment of the present invention, as shown in fig. 8, the system includes: first frequency channel allocation module 1, confirm module 2 and second frequency channel allocation module 3, wherein:
the first frequency band allocation module 1 is configured to send a first class of frequency band allocation schemes to each base station after receiving base station location information reported by each base station preset in the strait;
the determining module 2 is configured to obtain communication resource requirements of each cell corresponding to each base station after being allocated according to the first class frequency allocation scheme, and determine a target cell for which the communication resource requirements are greater than a preset threshold;
the second frequency band allocation module 3 is configured to send a second frequency band allocation scheme to the target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet a mobile broadband coverage requirement of the target cell.
Specifically, how to cover the strait mobile broadband through the first frequency band allocation module 1, the determination module 2, and the second frequency band allocation module 3 may be used to implement the technical solution of the strait mobile broadband covering method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
The mobile broadband coverage system for the strait provided by the embodiment of the invention allocates frequency bands for the cells needing additional communication resources by dynamically adjusting the frequency band allocation mode of each cell in the strait, thereby improving the coverage capability and the service quality of each cell in the strait.
An embodiment of the present invention provides a strait mobile broadband coverage device, including: at least one processor; and at least one memory communicatively coupled to the processor, wherein: fig. 9 is a block diagram of a structure of a strait mobile broadband coverage apparatus according to an embodiment of the present invention, and referring to fig. 9, the strait mobile broadband coverage apparatus includes: a processor (processor)810, a communication Interface 820, a memory 830 and a bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the bus 840. The communication interface 820 may be used for information transfer between the server and the strait mobile broadband coverage device. The processor 810 may call logic instructions in the memory 830 to perform the following method: after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station; acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold; and sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station; acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold; and sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station; acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold; and sending the second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for mobile broadband coverage of straits, comprising:
after receiving base station position information reported by each base station preset in the channel, sending the first class frequency band allocation scheme to each base station;
acquiring communication resource requirements of each cell corresponding to each base station after the first-class frequency band allocation scheme is allocated, and determining a target cell of which the communication resource requirements are greater than a preset threshold;
sending a second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell;
each base station preset in the strait is a shaped antenna base station; correspondingly, each cell corresponding to each base station is a rectangular cell;
after receiving the base station location information reported by each base station preset in the channel, the method sends the first class frequency allocation scheme to each base station, and specifically includes:
after receiving base station position information reported by each base station preset in the strait, acquiring a position relation matrix of a cell corresponding to the base station;
establishing a base station ranking table based on the position relation matrix of the cell corresponding to the base station, wherein the base station ranking table is ranked according to the number of adjacent base stations from large to small;
based on the base station sequencing list, formulating a first class frequency band allocation scheme, and sending the first class frequency band allocation scheme to each base station, wherein the first class frequency band allocation scheme is to allocate one of the first class frequency bands to each base station in sequence according to the sequence of each base station in the base station sequencing list, so that any two adjacent base stations do not share the same frequency band;
if a plurality of target cells exist, the sending a second-class frequency band allocation scheme to a target base station corresponding to the target cell so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell specifically includes:
acquiring the number of service users in each target cell, and calculating the ratio of the number of the service users between the target cells;
and formulating a second-class frequency band allocation scheme according to the proportion of the number of the service users, and sending the second-class frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
2. The method of claim 1, wherein the location relationship matrix of the cell corresponding to the base station is:
wherein i and j are base station numbers, bi,j＝{1or0}，bi,jWhen the number is 1, the geographic positions of cells corresponding to the ith base station and the jth base station are adjacent, bi,jAnd when the value is 0, the geographic positions of the cells corresponding to the ith base station and the jth base station are not adjacent.
3. The method according to claim 1, wherein the obtaining of the communication resource requirement of the cell corresponding to each base station after the allocation according to the first-class frequency allocation scheme, and determining the target cell whose communication resource requirement is greater than a preset threshold specifically include:
periodically acquiring the number of service users in each cell corresponding to each base station after the allocation according to the first-class frequency band allocation scheme;
and for any period, acquiring the communication resource requirement of each cell based on the number of service users in each cell, and taking the cell with the communication resource requirement larger than a preset threshold value as a corresponding target cell in the period.
4. A method for mobile broadband coverage of straits, comprising:
after reporting the position information of the base station, receiving a first class frequency band allocation scheme sent by a server;
after the first-class frequency band allocation scheme is allocated, the communication resource requirements of the cells corresponding to the base station are sent to a server, so that the server can determine the target cell of which the communication resource requirements are greater than a preset threshold value;
after a second frequency band allocation scheme sent by a server is received, adjusting antenna parameters based on the second frequency band allocation scheme so as to meet the mobile broadband coverage requirement of the target cell;
after reporting the base station location information, the receiving server sends a first class frequency allocation scheme, which specifically includes:
after receiving base station position information reported by each base station preset in the strait, acquiring a position relation matrix of a cell corresponding to the base station;
establishing a base station ranking table based on the position relation matrix of the cell corresponding to the base station, wherein the base station ranking table is ranked according to the number of adjacent base stations from large to small;
based on the base station sequencing list, formulating a first class frequency band allocation scheme, and sending the first class frequency band allocation scheme to each base station, wherein the first class frequency band allocation scheme is to allocate one of the first class frequency bands to each base station in sequence according to the sequence of each base station in the base station sequencing list, so that any two adjacent base stations do not share the same frequency band;
if there are multiple target cells, after receiving a second frequency band allocation scheme sent by a server, adjusting antenna parameters based on the second frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cells, specifically including:
acquiring the number of service users in each target cell, and calculating the ratio of the number of the service users between the target cells;
and formulating a second-class frequency band allocation scheme according to the proportion of the number of the service users, and sending the second-class frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
5. A strait mobile broadband coverage system, the system comprising:
the first frequency band allocation module is used for receiving base station position information reported by each base station preset in the strait and then sending a first class of frequency band allocation scheme to each base station;
a determining module, configured to obtain communication resource requirements of each cell corresponding to each base station after being allocated according to the first class frequency allocation scheme, and determine a target cell for which the communication resource requirements are greater than a preset threshold;
a second frequency band allocation module, configured to send a second frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second frequency band allocation scheme to meet a mobile broadband coverage requirement of the target cell;
the first frequency band allocation module is specifically used for acquiring a position relation matrix of a cell corresponding to a base station after receiving base station position information reported by each base station preset in the channel;
establishing a base station ranking table based on the position relation matrix of the cell corresponding to the base station, wherein the base station ranking table is ranked according to the number of adjacent base stations from large to small;
based on the base station sequencing list, formulating a first class frequency band allocation scheme, and sending the first class frequency band allocation scheme to each base station, wherein the first class frequency band allocation scheme is to allocate one of the first class frequency bands to each base station in sequence according to the sequence of each base station in the base station sequencing list, so that any two adjacent base stations do not share the same frequency band;
if a plurality of target cells exist, the sending a second-class frequency band allocation scheme to a target base station corresponding to the target cell so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell specifically includes:
acquiring the number of service users in each target cell, and calculating the ratio of the number of the service users between the target cells;
and formulating a second-class frequency band allocation scheme according to the proportion of the number of the service users, and sending the second-class frequency band allocation scheme to a target base station corresponding to the target cell, so that the target base station adjusts antenna parameters based on the second-class frequency band allocation scheme to meet the mobile broadband coverage requirement of the target cell.
6. A strait mobile broadband overlay device comprising a memory and a processor, wherein the processor and the memory communicate with each other via a bus; the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 4.
7. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 4.
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| CN102118759A (en) * | 2011-03-02 | 2011-07-06 | 北京邮电大学 | Downlink transmission frequency division method for cooperating multipoint transmission system on the basis of service quality |
| CN105356062A (en) * | 2015-10-23 | 2016-02-24 | 广东博纬通信科技有限公司 | Broadband array antenna |
| CN105578473A (en) * | 2014-10-13 | 2016-05-11 | 中兴通讯股份有限公司 | Frequency band allocation method and frequency band allocation device |
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| CN102118759A (en) * | 2011-03-02 | 2011-07-06 | 北京邮电大学 | Downlink transmission frequency division method for cooperating multipoint transmission system on the basis of service quality |
| CN105578473A (en) * | 2014-10-13 | 2016-05-11 | 中兴通讯股份有限公司 | Frequency band allocation method and frequency band allocation device |
| CN105356062A (en) * | 2015-10-23 | 2016-02-24 | 广东博纬通信科技有限公司 | Broadband array antenna |
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