CN102761947B - Method and system for coordinating same frequency interference based on power control - Google Patents

Method and system for coordinating same frequency interference based on power control Download PDF

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Publication number
CN102761947B
CN102761947B CN201110103961.1A CN201110103961A CN102761947B CN 102761947 B CN102761947 B CN 102761947B CN 201110103961 A CN201110103961 A CN 201110103961A CN 102761947 B CN102761947 B CN 102761947B
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base station
user
ccp
information
service
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CN102761947A (en
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苗婷
李岩
周栋
李峰
刘星
任龙涛
岳天恒
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2012/074225 priority patent/WO2012146142A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/386—TPC being performed in particular situations centralized, e.g. when the radio network controller or equivalent takes part in the power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for coordinating same frequency interference based on power control. The method comprises the steps as follows: after the weight distribution of all base stations using the same frequency spectrum is completed by a center control point (CCP) according to service user information and/or business information subordinate to the base stations, the maximum transmitting power of the base stations is computed; and for all the maximum transmitting power computed from the base stations, the CCP selects the minimum value in the maximum transmitting power allowed by the base station as the maximum transmitting power of the base station, and notifies the base station using the frequency spectrum to work according to the selected maximum transmitting power. The invention discloses a system. The method and the system provided by the invention ensure the service quality of high priority users and control the descending interference generated by different base stations using the same frequency spectrum in a reasonable level at the same time, thereby coordinating the same frequency interference between districts and lowering the same frequency interference between districts in the charge of each base station.

Description

Method and system for coordinating same frequency interference based on power control
Technical Field
The invention relates to a co-channel interference coordination technology in the field of wireless communication, in particular to a method and a system for coordinating co-channel interference based on power control.
Background
The fixed allocation and dynamic use of the frequency spectrum lead to that a large amount of frequency spectrum can not be fully utilized, on the premise of ensuring that authorized users are not interfered, the utilization rate of the frequency spectrum can be improved by adopting the perception radio technology, and the frequency spectrum which is not used by a main system, namely an authorized system, in a certain time and space region is used efficiently and flexibly.
In the current research of the cognitive radio technology, a secondary system, namely a cognitive radio system, can acquire the available spectrum resource information of a primary system through accessing an authorized service database, the secondary system acquires the spectrum resource and then allocates the spectrum resource to a base station, and due to the limited requested spectrum resource, the situation that a plurality of base stations compete for the same-segment spectrum may occur, and at this time, the same frequency interference among cells may be generated. At present, the land mobile communication cellular system adopts a frequency reuse mode, which increases the capacity of the system to a certain extent, improves the utilization rate of frequency spectrum, but also increases the interference degree of the system, and the larger the same frequency reuse coefficient is, the more serious the interference is. These problems directly affect the call quality of the user and may even cause problems such as dropped calls or failure to establish normal calls. Therefore, how to effectively reduce the co-channel interference between cells is a problem that needs to be considered in the field of wireless communication.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and a system for coordinating co-channel interference based on power control, which can coordinate and reduce the inter-cell co-channel interference for each base station.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for coordinating same frequency interference based on power control, which comprises the following steps:
a Central Control node (CCP) distributes weights for each base station using the same frequency spectrum according to the information of the subordinate service users of the base stations and/or the service information, and then calculates the maximum transmitting power of each base station;
the CCP selects a minimum value of all maximum transmission powers calculated for each base station and a maximum transmission power allowed by the base station itself as a maximum transmission power of the base station, and notifies the base station to operate according to the selected maximum transmission power when using the spectrum.
Wherein, before the assigning the weight, the method further comprises:
a base station reports a frequency spectrum to be started to a CCP, and reports subordinate service user information and/or service information of the base station;
and the CCP requests the base station using the frequency spectrum to report subordinate service user information and/or service information after finding other base stations using the frequency spectrum according to the information reported by the base station.
Wherein, the service user information and/or the service information includes: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein,
the priority of the user is specifically as follows: the user grade is selected by the user when the user opens an account, or the user grade is determined according to the consumption behavior of the user, or the user grade is determined according to the QoS requirement of the user;
the load condition of the base station is specifically as follows: the base station determines the load level according to the current radio resource status, and/or the transport network load, and/or the integrated available capacity of the cell.
Wherein, the calculating the maximum transmitting power of each base station specifically comprises: and calculating by combining the weight of each base station and the maximum interference level which can be accepted by the user terminal at the reference point.
Wherein the reference points are specifically: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station.
The invention also provides a system for coordinating same frequency interference based on power control, which comprises: a CCP and at least two base stations, wherein,
the CCP is used for calculating the maximum transmitting power of each base station after distributing weights for each base station using the same-section frequency spectrum according to the information of the subordinate service users of the base station and/or the service information, selecting the minimum value of all the maximum transmitting powers calculated by each base station and the maximum transmitting power allowed by the base station as the maximum transmitting power of the base station, and informing the base station to work according to the selected maximum transmitting power when the frequency spectrum is used.
Wherein the base station is further configured to: reporting the frequency spectrum to be started to CCP, and reporting the information of subordinate service users of the base station and/or service information;
the CCP is further configured to request the base station using the spectrum to report subordinate service user information and/or service information after finding other base stations using the spectrum according to the information reported by the base station.
Wherein, the service user information and/or the service information includes: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein,
the priority of the user is specifically as follows: the user grade is selected by the user when the user opens an account, or the user grade is determined according to the consumption behavior of the user, or the user grade is determined according to the QoS requirement of the user;
the load condition of the base station is specifically as follows: the base station determines the load level according to the current radio resource status, and/or the transport network load, and/or the integrated available capacity of the cell.
Wherein, the calculating the maximum transmitting power of each base station specifically comprises: and calculating by combining the weight of each base station and the maximum interference level which can be accepted by the user terminal at the reference point.
Wherein the at least two base stations are further distinguished as: an operating base station and one or more other base stations using the same frequency spectrum;
the reference points are specifically: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station.
According to the method and the system for coordinating co-frequency interference based on power control, CCP distributes weights for each base station using the same-section frequency spectrum according to the information of subordinate service users of the base station and/or service information, and then calculates the maximum transmitting power of each base station; the CCP selects all maximum transmission powers calculated for each base station, and a minimum value of the maximum transmission powers allowed by the base station itself as a maximum transmission power of the base station, and notifies the base station to operate according to the selected maximum transmission power when using the spectrum. The method can ensure the service quality of the high-priority user, and simultaneously control the downlink interference generated when different base stations use the same-segment frequency spectrum within a reasonable level, finally realize the co-channel interference coordination among the cells, and reduce the co-channel interference among the cells which are responsible by all the base stations.
Drawings
FIG. 1 is a schematic diagram of a network to which the present invention is applied;
FIG. 2 is a flow chart of a method for coordinating co-channel interference based on power control according to the present invention;
FIG. 3 is a schematic diagram of the reference points in a network structure according to the present invention;
FIG. 4 is a schematic diagram of an interference signal in a network structure according to the present invention;
fig. 5 is a flowchart of a method for determining a weight of a base station to calculate a maximum transmission power of each base station according to priorities of subordinate service users of the base station and a number of users corresponding to each priority in embodiment 1 of the method of the present invention;
fig. 6 is a flowchart of a method for determining a weight of a base station according to a load condition of the base station to calculate a maximum transmission power of each base station according to embodiment 2 of the method of the present invention;
fig. 7 is a flowchart of a method of calculating maximum transmission power of each base station according to priorities of subordinate service users of the base station, the number of users of each priority, and a load condition determination weight in embodiment 3 of the method of the present invention;
fig. 8 is a schematic diagram of a system structure for coordinating co-channel interference based on power control according to the present invention.
Detailed Description
The basic idea of the invention is that CCP is utilized to distribute weight for each base station using same section frequency spectrum according to the information of subordinate service user of the base station and/or service information, and then the maximum transmitting power of each base station is calculated; the CCP selects a minimum value of all maximum transmission powers calculated for each base station and a maximum transmission power allowed by the base station itself as a maximum transmission power of the base station, and notifies the base station to operate according to the selected maximum transmission power when using the spectrum.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
For better understanding of the present invention, first, a network structure applied by the present invention is described, fig. 1 is a schematic structural diagram of a network applied by the present invention, as shown in fig. 1, the network includes: the system comprises a database 11, a central control node (CCP)12 and a base station 13, wherein the database 11 is connected with the CCP12 and is mainly responsible for coordinately allocating main system idle spectrum resources for the CCP 12; the CCP12 is responsible for coordinating and allocating main system idle spectrum resources for the subordinate base station 13 according to a main system idle spectrum resource application proposed by the subordinate base station, and idle spectrum resource use information can be interacted between the CCPs 12 to avoid interference between base stations under different CCPs 12. In the present invention, the emphasis is placed on controlling the maximum transmission power of the base station.
Fig. 2 is a schematic flow chart of a method for coordinating co-channel interference based on power control according to the present invention, and as shown in fig. 2, the method includes:
step 201, CCP distributes weight for each base station using same band spectrum according to information of subordinate service users of the base station and/or service information;
specifically, the service user information and/or the service information includes: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein, the priority of the user is specifically: the user grade selected by the user when the user opens an account, or the user grade determined according to the consumption behavior of the user, or the user grade determined according to the QoS requirement of the user, and the user grade determined by other methods. The load condition of the base station is specifically as follows: the base station determines the load level according to the current radio resource status, and/or the transport network load, and/or the integrated available capacity of the cell.
Step 202, calculating the maximum transmitting power of each base station;
specifically, the calculating the maximum transmission power of each base station specifically includes: and calculating by combining the weight of each base station and the maximum interference level which can be accepted by the user terminal at the reference point. Wherein the reference points are specifically: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station. Fig. 3 is a schematic diagram of the reference point in the network structure according to the present invention, as shown in fig. 3, in which the operating base station 31, the base station 32 and the base station 33 all use the same frequency spectrum, the reference point 34 is a reference point of the base station 32 in the coverage area of the operating base station 31, and the reference point 35 is a reference point of the base station 33 in the coverage area of the operating base station 31.
The maximum interference level is specifically: an upper limit of the interference level that can be accepted for a reference point for a segment of the spectrum. The upper limit of the interference level is specifically: the overall interference level, i.e. the overall interference signal value, received by the user terminals at the reference point cannot exceed this value, otherwise the user terminals at the reference point will not be able to communicate properly. Fig. 4 is a schematic diagram of an interference signal in a network structure according to the present invention, as shown in fig. 4, in which a signal received by a ue 44 from a bs 43 is interfered by a signal transmitted by a bs 41 to a ue 42 in an adjacent cell at the same frequency, and for the ue 42, the signal is also interfered by a signal transmitted by the bs 43 to the ue 44 at the same frequency. When two ues are located at the border of the cells to which the base stations 41 and 43 belong, the strength of the useful signal and the interference signal received by the ues are equivalent, the interference will be very serious, and the communication quality of the ues will also be sharply reduced.
Step 203, the CCP selects the minimum value of all the maximum transmitting powers calculated for each base station and the maximum transmitting power allowed by the base station itself as the maximum transmitting power of the base station, and notifies the base station to operate according to the selected maximum transmitting power when using the spectrum.
Further, before step 201, the method further comprises: a base station reports a frequency spectrum to be started to a CCP, and reports subordinate service user information and/or service information of the base station; and the CCP requests the base station using the frequency spectrum to report subordinate service user information and/or service information after finding other base stations using the frequency spectrum according to the information reported by the base station. The service user information and/or the service information comprise: the priorities of the service users, the corresponding number of users and/or the load condition of the base station.
The following three method embodiments are all described by taking the co-channel interference problem among three base stations as an example. The invention is not limited to a three base station networking format in the context of its application.
Fig. 5 is a flowchart of a method for determining a weight of a base station to calculate a maximum transmission power of each base station according to priorities of subordinate service users of the base station and a number of users corresponding to each priority in embodiment 1 of the method of the present invention, as shown in fig. 5, including the following steps:
step 501, each base station reports the priority of its subordinate service users and the number of users corresponding to each priority to CCP;
specifically, the priority of the user refers to the level of the user. In this embodiment, taking N1, N2, and N3 as examples, N1 is the highest grade, N2 times is the lowest grade, and the number of users corresponding to each priority of the subordinate service users of base station k may be set as Nk1、nk2、nk3(k＝1，2，3)。
Further, before step 501, the method further comprises: CCP subordinate base stations 1 and 2 are using spectrum fjThe base station 3 also intends to use the frequency spectrum fjWhen the base station 3 reports the frequency spectrum f to be activated to the CCP firstjAnd reports the priority and each priority of subordinate service usersThe CCP finds out that the base station 1 and the base station 2 are using the frequency spectrum f according to the information reported by the base station 3jThe CCP requests the base station 1 and the base station 2 to report the priority of the subordinate service users and the number of users corresponding to each priority.
502, CCP distributes weight to each base station subordinate service user according to the user number corresponding to each priority;
specifically, the CCP determines the weight of each base station and the weight of the base station k according to the number of users corresponding to each priority of the subordinate service users of each base stationWherein, 0.6nk1、0.3nk2、0.1nk30.6, 0.3 and 0.1 in (A) are for nk1、nk2、nk3Has a high or low priority, as described in step 501, nk1、nk2、nk3Corresponding to N1, N2, N3, N1 being highest, N2 being lowest, and N3 being lowest, respectivelyk1、nk2、nk3Coefficients of 0.6, 0.3 and 0.1 were used, respectively. Similarly, other similar coefficients may be used to indicate the priority level, such as: 0.7nk1、0.2nk2、0.1nk3。
Step 503, the CCP selects one base station from the three base stations as a working base station, and determines reference points of other base stations relative to the working base station;
specifically, assuming that CCP selects base station 1 as an operating base station, a point, i.e., a reference point, where interference is strongest in the coverage area of base stations 2 and 3 with respect to operating base station 1 is determined.
The reference point of the base station 2 relative to the operating base station 1 is the point where the interference of the base station 2 to the operating base station 1 is the strongest, and is set as i12. The reference point of the base station 3 relative to the working base station 1 is the point with the strongest interference of the base station 3 to the coverage area of the working base station 1, and is set as i13. The reference point can be determined by methods such as drive test, simulation, system preheating and the like.
Step 504, the CCP calculates the maximum transmitting power of each base station according to the weight of each base station except the working base station and the maximum interference level that can be accepted by the user terminal at the reference point of each base station relative to the working base station;
specifically, a reference point i in the operating base station 1 is calculated according to the minimum receiver sensitivity and the receiver interference protection ratio of the user terminal at the reference point12The user terminal at (1) uses the spectrum fjMaximum acceptable interference level Iacceptable(i12，fj) The calculation formula is as follows:
wherein, Prx_required(i12，fj) Denotes the minimum receiver sensitivity of the user terminal at the reference point and PR denotes the receiver interference protection ratio.
Further, the maximum transmission power of base station k (k 2, 3) is calculated:
represents the sum of the weights of the base stations other than the operating base station, where mumRepresenting a weight representing an operating base station; mu.snRepresenting the weights of base stations other than the operating base station; f. ofjjRepresenting a frequency spectrum fjThe adjacent frequency of (2); ptx(fjjKk) denotes the use of the adjacent frequency fjjOf the base station kk, Lp(i12，fjjKk) denotes the use of the adjacent frequency fjjBase station kk and reference point i12Path loss between; g (i)12，fjjKk) denotes the use of the adjacent frequency fjjThe overall gain of the base station kk, including antenna gain, antenna pattern, etc.; o isjIndicating adjacent frequency fjjThe number of (2); n is a radical ofjIndicating the use of an adjacent frequency fjjThe number of base stations of (c); ACIR denotes the adjacent channel interference ratio.
Similarly, according to the weight mu of each base stationkAnd reference point i in the operating base station13For the user terminal to use the frequency spectrum fjMaximum interference level I acceptable in timeacceptable(i13，fj) And calculating the maximum transmitting power P of the base station k (k is 2, 3)tx(i13，fj，k)。
Finally get min { P }tx(i12，fj，k)，Ptx(i13，fjK) is the maximum transmission power calculated by the base station k (k 2, 3) relative to the operating base station.
Step 505, repeating the steps 503 to 504 until all the base stations using the same frequency spectrum are selected as primary operating base stations;
similarly, when the base station 2 is selected as the operating base station, the maximum transmission power of the base station k (k is 1, 3) is calculated to be min { P { (P) }tx(i21，fj，k)，Ptx(i23，fj，k)}。
When the base station 3 is selected as the operating base station, the calculated maximum transmission power of the base station k (k is 1, 2) is min { P { (m {)tx(i31，fj，k)，Ptx(i32，fj，k)}。
In step 506, the CCP selects the minimum one of all the maximum transmit powers calculated for each base station and the maximum transmit power allowed by the base station itself as the maximum transmit power of the base station.
In particular, the method comprises the following steps of,suppose that the maximum transmit power allowed by base station k is Pmax_k(k is 1, 2, 3), the final maximum transmission power of each base station is:
maximum transmission power of base station 1:
min{min{Ptx(i21，fj，1)，Ptx(i23，fj，1)}，min{Ptx(i31，fj，1)，Ptx(i32，fj，1)}，Pmax_1}
maximum transmission power of base station 2:
min{min{Ptx(i12，fj，2)，Ptx(i13，fj，2)}，min{Ptx(i31，fj，2)，Ptx(i32，fj，2)}，Pmax_2}
maximum transmission power of base station 3:
min{min{Ptx(i12，fj，3)，Ptx(i13，fj，3)}，min{Ptx(i21，fj，3)，Ptx(i23，fj，3)}，Pmax_3}
wherein imnDenotes the reference point of base station n with respect to the operating base station m (n, m ≠ 1, 2, 3, and n ≠ m).
Fig. 6 is a schematic flow chart of a method for determining a base station weight according to a base station load condition to calculate maximum transmission power of each base station according to method embodiment 2 of the present invention, as shown in fig. 6, including the following steps:
601, each base station reports the load condition to CCP;
specifically, the load condition of the base station may be classified according to grades, such as four grades including overload, high, medium and low, and may be L1、L2、L3、L4To indicate, gradeThe higher the number the greater. It can also be expressed by an integer between 0 and 100, and the larger the value, the higher the demand for spectrum resources.
Further, before step 601, the method further includes: CCP subordinate base stations 1 and 2 are using spectrum fjThe base station 3 also intends to use the frequency spectrum fjWhen the base station 3 reports the frequency spectrum f to be activated to the CCP firstjAnd the load condition thereof, the CCP finds that the base station 1 and the base station 2 also use the frequency spectrum f according to the information reported by the base station 3jThe CCP requests the base station 1 and the base station 2 to report the load status.
Step 602, CCP distributes weight for each base station according to the load condition of each base station;
specifically, CCP determines the weight of each base station according to the load condition of each base station, for example, the weight of base station k can be expressed asWherein lk∈{L1，L2，L3，L4H or lk∈{0，1...100}；lkThe value range of (c) depends on the representation of the base station load condition.
Step 603, the CCP selects one base station from the three base stations as a working base station, and determines reference points of other base stations relative to the working base station;
specifically, assuming that the CCP selects the base station 1 as the operating base station, the point where the interference is strongest in the coverage area of the base stations 2 and 3 relative to the operating base station 1, i.e. the reference point, is determined.
The reference point of the base station 2 relative to the operating base station 1 is the point where the interference of the base station 2 to the operating base station 1 is the strongest, and is set as i12. The reference point of the base station 3 relative to the working base station 1 is the point with the strongest interference of the base station 3 to the coverage area of the working base station 1, and is set as i13. The reference point can be determined by methods such as drive test, simulation, system preheating and the like.
Step 604, the CCP calculates the maximum transmitting power of each base station according to the weight of each base station except the working base station and the maximum interference level that can be accepted by the user terminal at the reference point of each base station relative to the working base station;
specifically, a reference point i in the operating base station 1 is calculated according to the minimum receiver sensitivity and the receiver interference protection ratio of the user terminal at the reference point12The user terminal at (1) uses the spectrum fjMaximum acceptable interference level Iacceptable(i12，fj) The calculation formula is as follows:
wherein, Prx_required(i12，fj) Denotes the minimum receiver sensitivity of the user terminal at the reference point and PR denotes the receiver interference protection ratio.
Further, the maximum transmission power of base station k (k 2, 3) is calculated:
represents the sum of the weights of the base stations other than the operating base station, where mumRepresenting a weight representing an operating base station; mu.snRepresenting the weights of base stations other than the operating base station; f. ofjjRepresenting a frequency spectrum fjThe adjacent frequency of (2); ptx(fjjKk) denotes the use of the adjacent frequency fjjOf the base station kk, Lp(i12，fjjKk) denotes the use of the adjacent frequency fjjBase station kk andreference point i12Path loss between; g (i)12，fjjKk) denotes the use of the adjacent frequency fjjThe overall gain of the base station kk, including antenna gain, antenna pattern, etc.; o isjIndicating adjacent frequency fjjThe number of (2); n is a radical ofjIndicating the use of an adjacent frequency fjjThe number of base stations of (c); ACIR denotes the adjacent channel interference ratio.
Similarly, according to the weight mu of each base stationkAnd reference point i in the operating base station13For the user terminal to use the frequency spectrum fjMaximum interference level I acceptable in timeacceptable(i13，fj) And calculating the maximum transmitting power P of the base station k (k is 2, 3)tx(i13，fj，k)，
Finally get min { P }tx(i12，fj，k)，Ptx(i13，fjK) is the maximum transmission power calculated by the base station k (k 2, 3) relative to the operating base station.
Step 605, repeating the steps 603 to 604 until all the base stations using the same frequency spectrum are selected as primary operating base stations;
similarly, when the base station 2 is selected as the operating base station, the maximum transmission power of the base station k (k is 1, 3) is calculated to be min { P { (P) }tx(i21，fj，k)，Ptx(i23，fj，k)}。
When the base station 3 is selected as the operating base station, the calculated maximum transmission power of the base station k (k is 1, 2) is min { P { (m {)tx(i31，fj，k)，Ptx(i32，fj，k)}。
In step 606, the CCP selects the minimum one of all the maximum transmission powers calculated for each base station and the maximum transmission power allowed by the base station itself as the maximum transmission power of the base station.
Specifically, suppose that the maximum transmission power allowed by the base station k is Pmax_k(k is 1, 2, 3), then finally eachThe maximum transmitting power of the base station is respectively as follows:
maximum transmission power of base station 1:
min{min{Ptx(i21，fj，1)，Ptx(i23，fj，1)}，min{Ptx(i31，fj，1)，Ptx(i32，fj，1)}，Pmax_1}
maximum transmission power of base station 2:
min{min{Ptx(i12，fj，2)，Ptx(i13，fj，2)}，min{Ptx(i31，fj，2)，Ptx(i32，fj，2)}，Pmax_2}
maximum transmission power of base station 3:
min{min{Ptx(i12，fj，3)，Ptx(i13，fj，3)}，min{Ptx(i21，fj，3)，Ptx(i23，fj，3)}，Pmax_3}
wherein imnDenotes the reference point of base station n with respect to the operating base station m (n, m ≠ 1, 2, 3, and n ≠ m).
Fig. 7 is a flowchart of a method for calculating maximum transmission power of each base station according to priorities of subordinate service users of the base station, the number of users of each priority, and a load condition determination weight in embodiment 3 of the method of the present invention, as shown in fig. 7, including the following steps:
step 701, each base station reports the priority of its subordinate service users, the number of users corresponding to each priority, and the load condition of the base station to the CCP;
specifically, the priority of the user refers to the level of the user. In this embodiment, taking N1, N2 and N3 as examples, N1 is the highest grade, N2 times and N3 is the lowest grade, and base station k is under the control of the serviceThe number of users corresponding to each priority of the users can be set as nk1、nk2、nk3(k＝1，2，3)。
The load condition of the base station may be classified according to grades, for example, including four grades of overload, high, medium and low, and may be L1、L2、L3、L4Meaning that the higher the rating the larger the value. It can also be expressed by an integer between 0 and 100, and the larger the value, the higher the demand for spectrum resources.
Further, before step 701, the method further includes: CCP subordinate base stations 1 and 2 are using spectrum fjThe base station 3 also intends to use the frequency spectrum fjWhen the base station 3 reports the frequency spectrum f to be activated to the CCP firstjThe priorities of the subordinate service users, the number of users corresponding to each priority and the load condition thereof, and the CCP finds out that the base station 1 and the base station 2 also use the frequency spectrum f according to the information reported by the base station 3jThe CCP requests the base stations 1 and 2 to report the priorities of subordinate service users, the number of users corresponding to each priority and the load conditions thereof.
Step 702, the CCP distributes weight to each base station according to the number of users corresponding to each priority of each subordinate service user of each base station and the load condition of the base station;
specifically, according to the number of users corresponding to each priority of the users served by each base station and their load conditions, the CCP determines the weight of each base station, for example, the weight of the base station k lk∈{L1，L2，L3，L4H or lk∈{0，1...100}；lkThe value range of (c) depends on the representation of the base station load condition. Wherein, 0.6nk1、0.3nk2、0.1nk30.6, 0.3 and 0.1 in (A) are for nk1、nk2、nk3Has a high or low priority, as described in step 501, nk1、nk2、nk3Corresponding to N1, N2, N3, N1 being highest, N2 being lowest, and N3 being lowest, respectivelyk1、nk2、nk3Coefficients of 0.6, 0.3 and 0.1 were used, respectively. Similarly, other similar coefficients may be used to indicate the priority level, such as: 0.7nk1、0.2nk2、0.1nk3. In addition, the weight μ is calculatedkIn the process, the weight calculated according to the number of users corresponding to each priority of each subordinate service user of each base station is multiplied by a coefficient 0.3, and the weight calculated according to the load condition of the base station is multiplied by a coefficient 0.7, which shows that the load condition of the base station is more important in calculating the total weight, the percentage of the load condition is 70%, the percentage of the weight calculated according to the number of users corresponding to each priority of each subordinate service user of each base station is 30%, and the percentages can be changed and preset according to the actual condition or the management requirement of the network.
Step 703, the CCP selects one base station from the three base stations as a working base station, and determines reference points of other base stations relative to the working base station;
specifically, assuming that CCP selects base station 1 as the operating base station, reference points of base stations 2 and 3 with respect to operating base station 1 are determined.
The reference point of the base station 2 relative to the operating base station 1 is the point where the interference of the base station 2 to the operating base station 1 is the strongest, and is set as i12. The reference point of the base station 3 relative to the working base station 1 is the point with the strongest interference of the base station 3 to the coverage area of the working base station 1, and is set as i13. The reference point can be determined by methods such as drive test, simulation, system preheating and the like.
Step 704, the CCP calculates the maximum transmitting power of each base station according to the weight of each base station except the working base station and the maximum interference level that can be accepted by the user terminal at the reference point of each base station relative to the working base station;
in particular, according to the minimum receiver sensitivity of the user terminal at the reference pointAnd the interference protection ratio of the receiver, and calculating a reference point i in the working base station 112The user terminal at (1) uses the spectrum fjMaximum interference level I acceptable in timeacceptable(i12，fj) The calculation formula is as follows:
wherein, Prx_required(i12，fj) Denotes the minimum receiver sensitivity of the user terminal at the reference point and PR denotes the receiver interference protection ratio.
Further, the maximum transmission power of base station k (k 2, 3) is calculated:
represents the sum of the weights of the base stations other than the operating base station, where mumRepresenting a weight representing an operating base station; mu.snRepresenting the weights of base stations other than the operating base station; f. ofjjRepresenting a frequency spectrum fjThe adjacent frequency of (2); ptx(fjjKk) denotes the use of the adjacent frequency fjjOf the base station kk, Lp(i12，fjjKk) denotes the use of the adjacent frequency fjjBase station kk and reference point i12Path loss between; g (i)12，fjjKk) denotes the use of the adjacent frequency fjjThe overall gain of the base station kk, including antenna gain, antenna pattern, etc.; o isjIndicating adjacent frequency fjjThe number of (2); n is a radical ofjIndicating the use of an adjacent frequency fjjThe number of base stations of (c); ACIR denotes the adjacent channel interference ratio.
Similarly, according to the weight mu of each base stationkAnd reference point i in the operating base station13For the user terminal to use the frequency spectrum fjMaximum interference level I acceptable in timeacceptable(i13，fj) And calculating the maximum transmitting power P of the base station k (k is 2, 3)tx(i13，fj，k)，
Finally get min { P }tx(i12，fj，k)，Ptx(i13，fjK) is the maximum transmission power calculated by the base station k (k 2, 3) relative to the operating base station.
Step 705, repeating the steps 703 to 704 until all the base stations using the same frequency spectrum are selected as primary operating base stations;
similarly, when the base station 2 is selected as the operating base station, the maximum transmission power of the base station k (k is 1, 3) is calculated to be min { P { (P) }tx(i21，fj，k)，Ptx(i23，fj，k)}。
When the base station 3 is selected as the operating base station, the calculated maximum transmission power of the base station k (k is 1, 2) is min { P { (m {)tx0(i31，fj，k)，Ptx(i32，fj，k)}。
In step 706, the CCP selects the minimum one of all the maximum transmission powers calculated for each base station and the maximum transmission power allowed by the base station itself as the maximum transmission power of the base station.
Specifically, suppose that the maximum transmission power allowed by the base station k is Pmax_k(k is 1, 2, 3). The final maximum transmission power of each base station is:
maximum transmission power of base station 1:
min{min{Ptx(i21，fj，1)，Ptx(i23，fj，1)}，min{Ptx(i31，fj，1)，Ptx(i32，fj，1)}，Pmax_1}
maximum transmission power of base station 2:
min{min{Ptx(i12，fj，2)，Ptx(i13，fj，2)}，min{Ptx(i31，fj，2)，Ptx(i32，fj，2)}，Pmax_2}
maximum transmission power of base station 3:
min{min{Ptx(i12，fj，3)，Ptx(i13，fj，3)}，min{Ptx(i21，fj，3)，Ptx(i23，fj，3)}，Pmax_3}
wherein imnDenotes the reference point of base station n with respect to the operating base station m (n, m ≠ 1, 2, 3, and n ≠ m).
Fig. 8 is a schematic structural diagram of a system for coordinating co-channel interference based on power control according to the present invention, and as shown in fig. 8, the system includes: CCP81, and at least two base stations 82, wherein,
the CCP81 is configured to calculate maximum transmit power of each base station 82 after assigning a weight to each base station 82 using the same-segment spectrum according to information of a service user subordinate to the base station 82 and/or traffic information, select all the maximum transmit powers calculated for each base station 82, use a minimum value of the maximum transmit power calculated for each base station 82 and a maximum transmit power allowed by the base station 82 itself as the maximum transmit power of the base station 82, and notify the base station 82 to operate according to the selected maximum transmit power when using the spectrum.
Specifically, the service user information and/or the service information includes: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein, the priority of the user is specifically: the user grade selected by the user when the user opens an account, or the user grade determined according to the consumption behavior of the user, or the user grade determined according to the QoS requirement of the user, and the user grade determined by other methods. The load condition of the base station 82 specifically includes: the base station 82 determines a load level based on the current radio resource status, and/or the transport network load, and/or the integrated cell available capacity.
The calculation of the maximum transmission power of each base station 82 specifically includes: the weights for the base stations 82 are combined with the maximum interference level that can be accepted by the user terminal at the reference point. To facilitate calculating the maximum transmission power of each base station 82, the at least two base stations 82 can be further divided into: an operating base station and one or more other base stations using the same segment of spectrum. The reference points are specifically: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station.
The maximum interference level is specifically: an upper limit of the interference level that can be accepted for a reference point for a segment of the spectrum. The upper limit of the interference level is specifically: the overall interference level, i.e. the overall interference signal value, received by the user terminals at the reference point cannot exceed this value, otherwise the user terminals at the reference point will not be able to communicate properly.
Further, the base station 82 is further configured to: reporting the frequency spectrum to be started by the base station to CCP81, and reporting the subordinate service user information and/or service information of the base station 82;
the CCP81 is further configured to, after finding other base stations 82 using the spectrum according to the information reported by the base station 82, request the base station 82 using the spectrum to report subordinate service user information and/or service information.
Specifically, the service user information and/or the service information includes: the priorities of the served users, and the corresponding number of users, and/or the loading conditions of the base station 82.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. A method for coordinating co-channel interference based on power control, the method comprising:
a Central Control node (CCP) distributes weights for each base station using the same frequency spectrum according to the information of the subordinate service users of the base stations and/or the service information, and then calculates the maximum transmitting power of each base station;
the CCP selects a minimum value of all maximum transmission powers calculated for each base station and a maximum transmission power allowed by the base station itself as a maximum transmission power of the base station, and notifies the base station to operate according to the selected maximum transmission power when using the spectrum.
2. The method of claim 1, wherein prior to assigning weights, further comprising:
a base station reports a frequency spectrum to be started to a CCP, and reports subordinate service user information and/or service information of the base station;
and the CCP requests the base station using the frequency spectrum to report subordinate service user information and/or service information after finding other base stations using the frequency spectrum according to the information reported by the base station.
3. The method according to claim 1 or 2, wherein the service user information and/or the service information comprises: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein,
the priority of the user is specifically as follows: the user grade is selected by the user when the user opens an account, or the user grade is determined according to the consumption behavior of the user, or the user grade is determined according to the QoS requirement of the user;
the load condition of the base station is specifically as follows: the base station determines the load level according to the current radio resource status, and/or the transport network load, and/or the integrated available capacity of the cell.
4. The method according to claim 1 or 2, wherein the calculating the maximum transmission power of each base station specifically comprises: and calculating by combining the weight of each base station and the maximum interference level which can be accepted by the user terminal at the reference point.
5. The method according to claim 4, characterized in that said reference points are in particular: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station.
6. A system for coordinating co-channel interference based on power control, the system comprising: a CCP and at least two base stations, wherein,
the CCP is used for calculating the maximum transmitting power of each base station after distributing weights for each base station using the same-section frequency spectrum according to the information of the subordinate service users of the base station and/or the service information, selecting the minimum value of all the maximum transmitting powers calculated by each base station and the maximum transmitting power allowed by the base station as the maximum transmitting power of the base station, and informing the base station to work according to the selected maximum transmitting power when the frequency spectrum is used.
7. The system of claim 6, wherein the base station is further configured to: reporting the frequency spectrum to be started to CCP, and reporting the information of subordinate service users of the base station and/or service information;
the CCP is further configured to request the base station using the spectrum to report subordinate service user information and/or service information after finding other base stations using the spectrum according to the information reported by the base station.
8. The system according to claim 6 or 7, wherein the service user information, and/or the service information comprises: each priority of service users, the corresponding number of users and/or the load condition of the base station; wherein,
the priority of the user is specifically as follows: the user grade is selected by the user when the user opens an account, or the user grade is determined according to the consumption behavior of the user, or the user grade is determined according to the QoS requirement of the user;
the load condition of the base station is specifically as follows: the base station determines the load level according to the current radio resource status, and/or the transport network load, and/or the integrated available capacity of the cell.
9. The system according to claim 6 or 7, wherein the calculating the maximum transmission power of each base station specifically comprises: and calculating by combining the weight of each base station and the maximum interference level which can be accepted by the user terminal at the reference point.
10. The system of claim 9, wherein the at least two base stations are further characterized by: an operating base station and one or more other base stations using the same frequency spectrum;
the reference points are specifically: the set of points with the strongest interference to the coverage area of the operating base station by other base stations using the same spectrum as the operating base station.
CN201110103961.1A 2011-04-25 2011-04-25 Method and system for coordinating same frequency interference based on power control Expired - Fee Related CN102761947B (en)

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