CN106162654B - Power LTE network frequency distribution and interference coordination method based on service isolation - Google Patents
Power LTE network frequency distribution and interference coordination method based on service isolation Download PDFInfo
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Abstract
The invention provides a power LTE network frequency distribution and interference coordination method based on service isolation, which comprises the following steps: the base station measures the signal-to-noise ratio of a link and acquires service rate requirement information by using information transmitted by an uplink channel between the base station and the terminal; counting the total service rate requirements of different service areas, and calculating the service occupation ratio of the different service areas; the base station performs proportion distribution on the authorized frequency sets according to the business occupation ratios of different business areas and the authorized frequency sets owned by the base station, and forms a production control area frequency subset and a management information area frequency subset; exchanging frequency subset allocation information between the base stations, and further adjusting the frequency subsets; and the base station performs frequency allocation on the service terminals in the coverage range according to the adjusted frequency set. The invention realizes the service bearing isolation of different service areas, has higher safety, and is more reasonable and flexible in frequency distribution of edge users compared with a frequency soft multiplexing method.
Description
Technical Field
The invention relates to the technical field of power system communication, in particular to a power LTE network frequency distribution and interference coordination method based on service isolation.
Background
The operation and inspection department and the marketing department of the power system respectively use different communication systems, generally only pay attention to and meet self business requirements, a situation that a plurality of independent access networks coexist is formed, network construction is repeated, and communication resources are not fully utilized. The LTE network is a multi-service-bearing network, and can support simultaneous transmission of multiple services, and if the LTE network is used to implement combined transmission of a commissioning service and a marketing service, network investment will be effectively reduced, and network utilization rate will be improved, but according to the safety protection management regulations of the power system, a power distribution communication network bearing service spans across a production control area and a management information area, and effective isolation of services of different safety areas is ensured by means of "safety partition, network dedication, transverse isolation, longitudinal authentication" and the like.
In order to meet the comprehensive access requirements of a large number of wireless communication devices, public network operators adopt a radio access network Sharing technology (RAN Sharing), the technology means that different types of terminal users access the same wireless network and share the same radio frequency spectrum resource, and the RAN Sharing technology adopted by a wireless part is an ideal solution for multi-service bearing of an electric power LTE system. In the existing multi-service bearing scheme, at the wireless access side, the service bearing of different security large areas is realized by adopting a mode of combining a fixed spectrum allocation method and a flexible spectrum allocation method. Specifically, the terminals in the same security domain adopt a flexible spectrum allocation method, and the terminals in different security domains adopt a fixed spectrum allocation method. However, this method ignores the distribution characteristics of the power service, and in different areas or different time periods, the service proportion is different between different service areas, and it is not time-efficient to adopt a fixed spectrum allocation method for different security areas.
There are many classical interference coordination solutions such as Fractional Frequency Reuse (FFR), soft Frequency Reuse (SFR). Once FFR is proposed, it provides good suppression of interference, it is simple and easy to operate, the use of subcarriers is severely limited, but the flexibility of frequency allocation and spectral efficiency are sacrificed. The method is mainly provided for a honeycomb structure of a public network, the distribution of power services has the characteristics of self, chain type networking is common, the distribution state of edge users is different from the honeycomb structure of the public network, and the existing frequency distribution and interference coordination scheme is directly applied to the power LTE system, so that the method is not reasonable and scientific.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a power LTE network frequency allocation and interference coordination method based on service isolation, which realizes service bearing isolation of different service areas.
The adopted solution for realizing the purpose is as follows:
a power LTE network frequency distribution and interference coordination method based on service isolation comprises the following steps:
(1) A power service terminal in the coverage range of a base station sends an access request to the base station, and the base station measures the signal-to-noise ratio of a link and acquires service rate requirement information by using information transmitted by an uplink channel between the base station and the terminal;
(2) The base station identifies the service terminals belonging to different service areas through the terminal identification, counts the total service rate requirements of the different service areas, and calculates the service occupation ratio of the different service areas;
(3) The base station performs proportional allocation on the authorized frequency sets according to the service occupation ratios of different service areas and the authorized frequency sets owned by the base station, so as to form a production control area frequency subset and a management information area frequency subset, wherein the two subsets have no frequency cross, and service terminals in different service areas use different frequencies for communication;
(4) The base stations exchange frequency subset distribution information through an X2 interface, and the two sides further adjust the frequency subsets according to the using condition of the edge service terminal;
(5) And the base station performs frequency allocation on the service terminals in the coverage range according to the adjusted frequency set.
Preferably, the frequency subsets are not adjusted in the service transmission process, and when a new service is accessed and the frequency use of an adjacent base station is influenced, the frequency subsets are adjusted by utilizing the information interaction between the base stations.
Preferably, the production control large area service is divided into a real-time service and a non-real-time service;
all resources of the corresponding frequency subsets are allocated to be used during the transmission of the single-class service;
the allocation method for the simultaneous transmission of the two types of services comprises the following steps: a. firstly, allocating independent frequencies for real-time services, and allocating the rest authorized frequency sets according to the service proportion of different service areas;
b. and in the frequency subset division, the real-time service requirement and the non-real-time service requirement are not considered, if the allocated frequency resource is greater than the service requirement, an independent frequency resource is allocated to the service in the allocated frequency subset of the production control area, and if the allocated frequency resource is less than the service requirement, frequency sharing is carried out.
Further, the frequency sharing includes: different service identifiers are marked for data packets of different services in a production control area, the real-time service identifier is the highest priority access level, the frequency resources can be used at any time, and the non-real-time services can share the frequency resources.
Preferably, the step (4) includes: if the base station 1 has only one service area with edge users, the edge user frequency allocation of the base station 2 includes: the edge user frequency of the base station 1 is allocated to the central user of the base station 2 or allocated to the edge user on the other side of the base station 2.
Preferably, the step (4) comprises: if there are edge users in both service areas of the base station 1, the edge user frequency allocation of the base station 2 includes:
1) The service proportion of the edge users of two service large areas of the base station 1 is less than 20 percent, and the frequency used by the edge users of the base station 1 is distributed to the central users with large frequency subsets in the base station 2;
2) The service proportion of the edge users of the production control large area of the base station 1 is less than 20 percent, the service proportion of the edge users of the management information large area is more than 80 percent, and the use frequency of the edge users of the base station 1 is distributed to the central users of the production control large area in the base station 2 for use;
3) The base station 1 controls the proportion of the edge user service of the large area to be more than 80 percent, the proportion of the edge user service of the management information large area to be less than 20 percent, and the use frequency of the edge user of the base station 1 is distributed to the central users of the management subset in the base station 2 for use.
Further, the edge user is determined according to the address position and the received signal strength of the service terminal.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
in the technical scheme provided by the invention, frequency allocation is executed according to the safety management requirements of different service areas of the power system, and based on the service management requirements of different service areas, the available resources of the cells are allocated into the frequency subsets of the production control area and the frequency subsets of the management information control area, so that service bearing isolation of different service areas is realized.
In addition, the invention provides a cell interference coordination method facing chain type networking aiming at a wireless chain type networking scene of a power system, the method is a method based on power service transmission characteristics, and compared with a frequency soft multiplexing method, the frequency distribution of edge users is more reasonable and flexible.
Drawings
FIG. 1 is a schematic diagram of frequency subset partitioning provided by the present invention;
FIG. 2 is a chain networking model provided by the present invention;
fig. 3 is a schematic diagram of interference provided by the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to meet the comprehensive access requirements of a large number of wireless communication devices, public network operators adopt a radio access network Sharing technology (RAN Sharing), the technology means that different types of terminal users access the same wireless network and share the same radio frequency spectrum resource, and the RAN Sharing technology adopted by a wireless part is an ideal solution for multi-service bearing of an electric power LTE system. In the existing service bearing scheme, at the wireless access side, the service bearing of different security large areas is realized by adopting a mode of combining a fixed spectrum allocation method and a flexible spectrum allocation method. Terminals in the same safety area adopt a flexible spectrum allocation method, and terminals in different safety areas adopt a fixed spectrum allocation method. However, due to the particularity of the distribution of the power facilities, the facilities of different power application scenarios are distributed in different areas, for example, in an area covered by a production control large area, there may be no service requirement of a management information large area, in this case, spectrum resources in the same cell may all be used for production services, while in some areas, there may be a requirement for accessing both services, specifically, in different areas, service requirements between different large areas are also different, for example, there are many service requirements of a production control large area in some areas, and many service requirements of a management information large area in some areas, or there are a large number of service access requirements in both large areas, and it is not timely that different security large areas adopt a fixed spectrum allocation manner, so that a dynamic spectrum allocation method is needed to manage these spectrum resources, thereby realizing service isolation and simultaneously realizing maximization of resource utilization.
The specific frequency resource allocation process based on service isolation is as follows:
1) The method comprises the steps that a power service terminal in the coverage range of a base station sends an access request to the base station, and the base station measures the signal-to-noise ratio of a link and acquires information such as the speed requirement of the service terminal by using information transmitted by an uplink channel between the base station and the terminal;
2) The base station identifies the service terminals respectively belonging to different service areas through the terminal identification, counts the total service rate requirements of the different service areas, and calculates the service occupation ratio of the different service areas;
3) The base station performs proportional allocation on the authorized frequency sets according to the service occupation ratios of different service areas and the authorized frequency sets owned by the base station, so as to form a production control area frequency subset (production frequency subset) and a management information area frequency subset (management frequency subset), wherein the two subsets have no frequency cross, service terminals in different service areas use different frequency communication, and the service physical isolation and the frequency resource dynamic allocation of a wireless air interface side are realized;
4) The base stations exchange frequency subset distribution information through an X2 interface, and the two sides further adjust the frequency subsets according to the using condition of the edge service terminal;
5) And the base station performs frequency allocation on the service terminals in the coverage range according to the adjusted frequency set.
In consideration of the fact that the wireless power access is different from the public network access, although the frequency subsets are dynamically changed, in order to reduce signaling overhead and meet the periodic access requirement of power, the frequency subsets are not adjusted in the service transmission process, and when a new service is accessed and the frequency use of adjacent cells is influenced, the frequency subsets are adjusted by utilizing information interaction between base stations.
Since different services have different QoS requirements, generally, the service requirement of the production control area is higher than that of the management information area, and for the production control area service, real-time service and non-real-time service are further subdivided. According to the access requirement of a service terminal, two access scenes exist, including scenes that two different large-area services are transmitted simultaneously and only one service is transmitted, and when the service requirement is the same type of requirement, all resources of a corresponding frequency subset are distributed to the service terminal for use; when two kinds of services are transmitted simultaneously, there are 2 distribution methods, the first one is to distribute independent frequency for real-time service, the rest authorized frequency set is distributed according to the service occupation ratio of different service areas in the above step 3, the second one is to do frequency subset division without considering real-time and non-real-time service requirements, and distribute and use in the frequency subset of the distributed production control area, if the distributed frequency resource is larger than the service requirement, the independent frequency resource is distributed for the service, if the distributed frequency resource is smaller than the service requirement, the frequency sharing is needed. Specifically, different service identifiers are marked for data packets for generating different services in the control area, the real-time service identifier is the highest priority access level, the frequency resources can be used at any time, and the non-real-time service identifiers can be shared.
In step 3, although independent frequency subsets are allocated to different service areas, considering the existence of inter-cell interference, different frequencies need to be allocated to adjacent edge users of adjacent cells to avoid interference, so that service terminals of different service areas are divided into edge users and center users, and the frequencies in the frequency subsets are subdivided according to service duty ratios. The edge user is determined according to the address location and the received signal strength of the service terminal.
The advantage of first dividing the service area into subsets and then subdividing the subsets, as shown in fig. 1, is that if the subsets are centered and edge, it cannot be guaranteed that the production service will necessarily select a good frequency band, and if the subsets are divided first, the good frequency band can be preferentially selected. Secondly, after dividing the edge subset, the edge of the neighboring cell cannot use the frequency band in the subset, but for the power service, the periodic service is more, so there may be no edge user in a period of time, and thus the spectrum utilization rate can be improved.
In step 4, when the base station information is interacted, firstly, the networking architecture is judged, which directly influences the frequency allocation condition of the edge users, and considering that the chain networking scenes in the power system are more and the cellular coverage scenes are less, the invention mainly considers the cell interference coordination under the chain networking condition, and the interference coordination method of the public network can be used for the cellular cell interference coordination. As shown in the chain networking model in fig. 2, interference exists at the intersection of three cells, and different frequencies need to be allocated to different edge users so as not to generate interference.
Taking cell 1 (reference cell) in fig. 3 as an example, because of the chain networking distribution, it is not necessary to consider interference in the whole edge area, but only possible interference edges of adjacent cells need to be considered, which has the advantage that the edge users occupy less frequency resources and are available to the central users more. The interference area is defined as the area where the coverage areas of two base stations intersect, and the base stations are assumed to have regular circular coverage in the figure.
In order to reduce the frequency band cross used by different service areas, continuous distribution is adopted during frequency band distribution, meanwhile, in consideration of the importance of production service, the distribution of the production area is firstly carried out, then the distribution of the management area is carried out, and the frequency band with good quality can be preferentially selected.
As shown in fig. 3, a cell 2 has a service transmission requirement, and performs information interaction with a cell 1 through an X2 interface, the cell 1 informs an edge user of the cell 2 of using frequency information, if an interference area adjacent to the cell 1 and the cell 2 has no edge user, the cell 2 can freely allocate a frequency band (the right edge of the cell 2 is not considered temporarily), and if an edge user exists in an interference area adjacent to the cell 1 and the cell 2, the two situations are divided, the edge of the cell 2 has no service requirement, and the situation of allocating the edge user of the cell 1 does not need to be considered, because a service terminal of the cell 2 is not in an interference range. If there is a need for transmission of edge users in the interference area of cell 2, the allocated allocation of the neighboring cell 1 is deducted, as detailed below.
If the edge of cell 1 has only one service in the large area, such as one of the production or management services, cell 2 has 2 methods assigned to the edge: the first, the edge user frequency of cell 1 is allocated to the center user of cell 2, and the second, to the edge of the other side.
If there are edge users in both service areas of the cell 1, according to the foregoing allocation method, both subsets are allocated according to the service ratio of the production control area service and the management information area service, so that the sizes of the two subsets are different.
Then, the central and edge service occupation ratios in the service large area in the cell 1 are respectively counted, and there are 4 cases:
1) The edge user service proportion of two service large areas of the cell 1 is less than 20 percent, and the frequency used by the edge user of the cell 1 is distributed to the central user with large frequency subset in the cell 2;
2) The percentage of the edge user service of the production control large area of the cell 1 is less than 20 percent, the percentage of the edge user service of the management information large area is more than 80 percent, and the use frequency of the edge users of the cell 1 is distributed to the central users of the production control large area in the cell 2 for use;
3) The cell 1 production control large area edge user service accounts for more than 80%, the management information large area edge user service accounts for less than 20%, and the cell 1 edge user use frequency is distributed to the central users of the management subset in the cell 2.
4) The edge traffic proportion of the two large service areas is more than 80%. This is rare, which indicates that the remote unit deployment location of the base station is unreasonable in the initial stage of building the station, and the intensive traffic should be deployed at the central location of the remote unit without considering the concurrency of the edge users. Moreover, if the frequency band occupied by the edge service is large, the frequency resources available for the edge users of the adjacent cells are very small, which results in access failure.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.
Claims (7)
1. A power LTE network frequency allocation and interference coordination method based on service isolation is characterized by comprising the following steps:
(1) A power service terminal in the coverage range of a base station sends an access request to the base station, and the base station measures the signal-to-noise ratio of a link and acquires service rate requirement information by using information transmitted by an uplink channel between the base station and the terminal;
(2) The base station identifies the service terminals of different service areas through the terminal identification, counts the total service rate requirements of the different service areas, and calculates the service occupation ratios of the different service areas;
(3) The base station performs proportional allocation on the authorized frequency set according to the service occupation ratio to form a production control large-area frequency subset and a management information large-area frequency subset, frequency cross does not exist between the two subsets, and service terminals in different service large areas use different frequencies for communication;
(4) Interacting frequency subset distribution information between base stations through an X2 interface, and further adjusting the frequency subsets by the two sides according to the service condition of the edge service terminal;
(5) And the base station performs frequency allocation on the service terminals in the coverage range according to the adjusted frequency set.
2. The method of claim 1, wherein the frequency subsets are not adjusted during service transmission, and when a new service is accessed and affects the frequency usage of an adjacent base station, the frequency subsets are adjusted by using information interaction between base stations.
3. The method of claim 1, wherein the traffic of the production control area comprises real-time traffic and non-real-time traffic;
all resources of the corresponding frequency subsets are allocated to be used during the transmission of the single-class service;
the distribution method when the two types of services are transmitted simultaneously comprises the following steps: a. after independent frequencies are distributed to the real-time service, the rest authorized frequency sets are distributed according to the service occupation ratio of different service areas;
b. and in the frequency subset division, the real-time service requirement and the non-real-time service requirement are not considered, if the allocated frequency resource is greater than the service requirement, an independent frequency resource is allocated to the service in the allocated frequency subset of the production control area, and if the allocated frequency resource is less than the service requirement, frequency sharing is carried out.
4. The method of claim 3, wherein the frequency sharing comprises: different service identifiers are marked for data packets of different services in a production control area, the real-time service is identified as the highest priority access level, the frequency resources can be used at any time, and the non-real-time services can share the frequency resources.
5. The method for frequency allocation and interference coordination according to claim 1, wherein said step (4) comprises: if one of the base stations has only one service area with edge users, the edge user frequency allocation of the other base station comprises the following steps: and allocating the edge user frequency of the base station to be used by a central user of the other base station or to be used by an edge user on the other side of the other base station.
6. The method of claim 1, wherein the step (4) comprises: if edge users exist in both service areas of one base station, the frequency allocation of the edge users of the other base station comprises the following steps:
1) The edge user service proportion of two service large areas of the base station is less than 20 percent, and the frequency used by the edge user of the base station is distributed to the central user with large frequency subset in the other base station;
2) The percentage of the edge user service of the production control large area of the base station is less than 20 percent, the percentage of the edge user service of the management information large area is more than 80 percent, and the use frequency of the edge user of the base station is distributed to the central user of the production control large area in the other base station;
3) The production control large area edge user service proportion of the base station is more than 80%, the management information large area edge user service proportion is less than 20%, and the use frequency of the edge user of the base station is distributed to the central user of the management subset in the other base station.
7. The method of claim 6 wherein the edge users are determined based on the location of the service terminal's address and received signal strength.
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| CN107333269B (en) * | 2017-06-01 | 2020-12-22 | 国网浙江省电力公司嘉兴供电公司 | Power LTE230 network frequency distribution and interference coordination method under static demand |
| CN109618413B (en) * | 2019-01-02 | 2021-07-09 | 中国科学院上海微系统与信息技术研究所 | Multi-service isolation method for electric power wireless private network system |
| CN109769306A (en) * | 2019-03-20 | 2019-05-17 | 北京智芯微电子科技有限公司 | Shared channel resources dispatching distribution method and system suitable for electric power wireless private network |
| CN110611910B (en) * | 2019-09-26 | 2023-05-23 | 国网江苏省电力有限公司信息通信分公司 | Wireless side network isolation method and system in heterogeneous communication private network system |
| CN111669776B (en) * | 2020-05-22 | 2023-05-30 | 中国联合网络通信集团有限公司 | Edge rate determining method and device |
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