CN103686744B - Resource allocation methods, macro base station, femto base station and communication system - Google Patents

Abstract

The application provides resource allocation methods, macro base station, femto base station and communication system.At macro base station end, there is provided a kind of resource allocation methods, including：According to the transmittability of the user of each sector of access macro base station, it is sector centers user or sector-edge user to determine the user；And according to the user be sector centers user or sector-edge user, determine the frequency resource that the user uses.At femto base station end, there is provided a kind of resource allocation methods, including：According to the transmittability of the user of access macro base station sector and access the transmittability of the user of femto base station in this sector, the frequency resource that adjustment femto base station uses.According to the scheme of the application, it can suppress to improve while cell intra/inter- interference the handling capacity of whole network, improve the performance of whole network.

Description

Resource allocation method, macro base station, pico base station and communication system

technical field

The present application relates to the communication field, in particular to the soft frequency multiplexing technology under the heterogeneous cellular network, and more specifically to a resource allocation method, a macro base station, a pico base station and a communication system.

Background technique

In the Long Term Evolution (LTE, Long Term Evolution) version of the Universal Mobile Telecommunications System (UMTS, Universal Mobile Telecommunications System) technical standard developed by the 3rd Generation Partnership Project (3GPP, The3rd Generation Partnership Project), as the number of users As well as the increasing demands of users for diversified business types, the macro cellular network can no longer meet these demands. In some places where users are relatively dense and the coverage performance of macro base stations is insufficient, hot spots and blind spots of macro base station coverage are formed, and the proposal of heterogeneous cellular network can exactly meet these requirements.

In a heterogeneous cellular network, transmitting nodes with lower transmission power than traditional macro base stations are introduced, namely pico base stations, femto base stations, relays, and the like. Among them, pico base stations and relays are planned and deployed by operators, but the introduction of pico base stations increases intra-cell and inter-cell interference, especially for users located in the edge areas of macro base stations. In order to reduce such interference, an interference coordination technology of soft frequency multiplexing is proposed in the prior art.

In the traditional soft frequency reuse mode, a macro base station is divided into three sectors, and each sector uses the same frequency resource. The three sectors in a cell independently complete the scheduling of users in the sector. The pico base stations in a sector are not divided into sectors, and independently complete resource allocation and resource scheduling for users within the coverage area. Users geographically located at the edge of the sector are classified as sector edge users, and other users at the center of the sector are classified as sector center users. Divide the frequency resources that can be used in the network into three parts of equal width. Sector edge users in the three sectors in a cell use these three parts of frequency resources orthogonal to each other to reduce interference. The user at the center of the sector and the pico base station in this sector use the remaining 2/3 of the frequency resources in the sector except the 1/3 of the frequency resources used by the sector edge users. The macro base station uses higher power when transmitting for the sector edge users of each sector, and uses lower power when transmitting for the sector center users of each sector. The transmission power of the pico base station is the same for the users served.

Through this kind of soft frequency reuse, the frequency reuse factor in the edge area can be improved, interference can be reduced, and the problem of reduced user throughput at the edge of the sector can be well solved. However, the issue of fairness between sector edge users and sector center users still needs to be considered, and the addition of pico base stations makes the interference coordination problem under soft frequency reuse more complicated.

In addition, in the LTE system, when the service user set of the macro/pico base station is determined, the base station generally uses a proportional fair scheduling algorithm to schedule the served users, in which the sector edge users and sector Center users are divided. However, in the actual communication system, due to the addition of pico base stations, the situation of each channel becomes more complicated. There are certain defects in dividing the sector edge users and sector center users simply by geographical location or reference signal received power. And the trade-off between the user throughput and the total throughput at the edge of the sector cannot be achieved.

Therefore, an improved resource allocation scheme is required to overcome the above-mentioned problems of complex interference coordination caused by the addition of pico base stations under soft frequency reuse and the problem of unbalanced user throughput and total throughput at the sector edge.

Contents of the invention

Correspondingly, an object of the present application is to provide a resource allocation method to improve the throughput of users in the cell edge area while ensuring the throughput of users in the center area of the cell, thereby improving the total throughput of the entire network.

Another object of the present application is to provide a resource allocation method to further improve and optimize the interference of soft frequency reuse under heterogeneous cellular networks, suppress intra-cell interference and inter-cell interference under heterogeneous cellular networks, and improve the overall network efficiency. performance.

Specifically, according to an aspect of the embodiments of the present application, there is provided a resource allocation method, which is characterized by comprising: according to the transmission capability of the user accessing each sector of the macro base station, determining that the user is the sector center The user is also a sector edge user; and determining frequency resources used by the user according to whether the user is a sector center user or a sector edge user.

According to another aspect of the embodiments of the present application, there is provided a resource allocation method, which includes: according to the transmission capabilities of users accessing the sector of the macro base station and the transmission capabilities of users accessing the sector of the pico base station, Adjust frequency resources used by the pico base station.

According to another aspect of the embodiment of the present application, there is provided a macro base station, which is characterized in that it includes: a user determining unit, configured to determine that the user is a sector based on the transmission capability of a user accessing each sector of the macro base station A zone center user or a sector edge user; and a frequency determining unit configured to determine the frequency resources used by the user according to whether the user is a sector center user or a sector edge user.

According to another aspect of the embodiment of the present application, there is provided a pico base station, which is characterized in that it includes: an adjustment unit, configured to base on the transmission capability of users accessing the sector of the macro base station and the users accessing the sector of the pico base station transmission capability, and adjust the frequency resources used by the pico base station.

According to another aspect of the embodiment of the present application, a communication system is provided, including a macro base station and a pico base station, wherein the macro base station determines that the user is the center of the sector according to the transmission capability of the user accessing the sector The user is also a sector edge user, and then determines the frequency resource used by the user; and the pico base station adjusts the pico base station according to the transmission capability of the user accessing the sector of the macro base station and the transmission capability of the user accessing the pico base station The frequency resource used.

Compared with the prior art, according to the technical solution of the present application, at the end of the macro base station, by dynamically adjusting the ratio of sector edge users, the throughput of the entire network and the fairness of resource allocation are improved. In addition, on the pico base station side, by adjusting the used frequency band and power transmission according to the transmission situation of the macro base station side, the allocation of resources and the number of users in the hotspot area match the demand, thereby reducing its impact while ensuring its own throughput. The interference of other users can suppress the intra-cell interference and inter-cell interference under the heterogeneous cellular network, and improve the performance of the entire network.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a flowchart of a resource allocation method according to an embodiment of the present application;

FIG. 2 is a flowchart of a method for determining whether a user is a sector center user or a sector edge user according to an embodiment of the present application;

3 is a flowchart of a method for determining whether a user is a sector center user or a sector edge user according to another embodiment of the present application;

FIG. 4 is a flowchart of a method for finely dividing sector center users and sector edge users according to an embodiment of the present application;

FIG. 5 is a flowchart of a resource allocation method according to another embodiment of the present application;

FIG. 6 is a flowchart of a resource allocation method according to another embodiment of the present application;

Fig. 7 is a schematic structural block diagram of a macro base station according to an embodiment of the present application;

Fig. 8 is a schematic structural block diagram of a pico base station according to an embodiment of the present application;

Fig. 9 is a schematic structural block diagram of a communication system according to an embodiment of the present application; and

Fig. 10 is a schematic diagram showing resource allocation and transmit power of different micro base stations in the same sector.

detailed description

The main idea of this application is that, on the one hand, at the macro base station, instead of simply dividing the sector edge users and sector center users by geographical location or reference signal received power, the sector is dynamically adjusted according to the user's transmission capability The ratio of edge users is used to divide sector edge users and sector center users. Therefore, the fairness of resource allocation is taken into account while improving the throughput of the entire network. On the other hand, at the femto base station, dynamically adjust the used frequency band and power transmission according to its own load, so that the allocation of resources and the number of users in the hotspot area match the demand, thereby reducing its load while ensuring its own throughput. Interference from other users improves the performance of the entire network.

In order to make the purpose, technical solution and advantages of the application clearer, the technical solution of the application will be clearly and completely described below in conjunction with the specific embodiments of the application and the corresponding drawings. Obviously, the described embodiments are only a part of the application Examples, not all examples. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Referring to FIG. 1 , FIG. 1 shows a flowchart of a resource allocation method 100 according to an embodiment of the present application. The method can be implemented at the end of a macro base station in a homogeneous or heterogeneous cellular network.

Firstly, it should be pointed out that the method in the embodiment of the present application can be implemented in each sector of the macro base station.

As shown in FIG. 1 , at step S110 , according to the transmission capability of the user accessing each sector of the macro base station, it is determined whether the user is a sector center user or a sector edge user.

In the prior art, sector edge users and sector center users are usually divided purely based on geographic location or received power of a reference signal. However, in the solution of this application, on the basis of roughly dividing the sector edge user set and the sector center user set (rough division) through the existing technology, the transmission capability of the users can be further considered to carry out the sector edge user set and the sector center user set. More precise and fair division of sector center users (fine division). This will be described in more detail below in conjunction with FIG. 2 .

Fig. 2 shows a flowchart of a method 200 for determining whether a user is a sector center user or a sector edge user according to an embodiment of the present application.

First of all, it should be explained that according to the soft frequency reuse mechanism in the heterogeneous network, a macro base station is divided into three sectors, and each sector can use all frequency bands, and the three sectors in a cell and the The pico base stations in the sector independently complete the scheduling of the served users. Accordingly, the method 200 described herein can be performed on a per-sector basis.

As shown in FIG. 2 , at step S210 , users accessing each sector of the macro base station are roughly divided into sector center users and sector edge users.

In one embodiment, this coarse division may be based on the user's geographic location. For example, rough division may be performed according to the distance between the user location and the macro base station location. Specifically, when the distance between the location of the user and the location of the macro base station is smaller than a predetermined threshold, the user may be classified as a sector center user. When the distance between the location of the user and the location of the macro base station is greater than or equal to a predetermined threshold, the user may be classified as a sector edge user.

In another embodiment, this coarse division may be done based on the reference signal received power (RSRP) of the users. According to a specific embodiment of the present application, the sector center user set and the sector edge user set may be roughly determined according to the user reference signal received power.

More specifically, for each sector, users accessing the macro base station can be sorted according to the level of their reference signal received power. Assuming that the number of users accessing the macro base station is denoted as N _macro , its set is denoted as U _macro , the predetermined initial sector edge user ratio coefficient is η, the number of sector edge users is denoted as N _edge , and its set is denoted as U _edge , the number of users in the center of the sector is denoted as N _center , and its set is denoted as U _center . Then N _edge =N _macro *n users with the smallest reference signal received power can be determined as sector edge users, and the rest are sector center users, that is, the number of sector center users is N _edge =N _macro *(1- n). Thus, the sector center user set U _center and the sector edge user set U _edge can be roughly divided.

The above roughly divided embodiments are only examples, and do not constitute any limitation to the present application. It should be understood that macro base station users may be roughly divided into sector center users and sector edge users according to any suitable method known in the art or developed in the future.

Next, at step S220, according to the user's transmission capability, a fine division is performed for the sector center user and the sector edge user at the division boundary.

Specifically, for example, in the case of division according to the geographical location of the user, the sector center user and the sector edge user at the division boundary may refer to the sector center user whose distance between the user position and the macro base station position is near a predetermined threshold and sector edge users, for example, a sector center user and a sector edge user closest to the threshold or several sector center users and sector edge users closer to the threshold. For example, in the case of dividing according to the received power of the user's reference signal, the sector center user and the sector edge user at the division boundary may refer to the one with the lowest reference signal received power in the sector center user set obtained after rough division A sector center user or several lower sector center users, and a sector edge user or several higher sector edge users with the highest reference signal received power in the sector edge user set obtained after rough division.

According to the embodiment of the present application, by balancing the average transmission capability of the sector center users and the average transmission capability of the sector edge users, and taking into account the average throughput of the sector users, the sector center users and Sector edge users are further finely divided. This will be described in more detail later with reference to FIG. 4 .

Fig. 3 shows a flowchart of a method 300 for determining whether a user is a sector center user or a sector edge user according to another embodiment of the present application.

As a method for determining whether a user is a sector center user or a sector edge user, the method in FIG. 3 includes steps S310 to S330. Compared with the method 200 in FIG. 2 , the difference is that a step is added between steps S210 and S220 in FIG. 2 , that is, step S320. Since step S310 and step S330 are similar to steps S210 and S220 described above, they are not repeated here. Only step S320 will be described in detail below.

After rough division of sector center users and sector edge users for users accessing each sector of the macro base station at step S310, enter step S320, and divide sector center users and sector The users at the edge of the zone are sorted to determine the users at the center of the sector and the users at the edge of the sector at the division boundary.

In this embodiment, after roughly determining the user set at the center of the sector and the set of users at the edge of the sector according to the received power of the user's reference signal, according to the value of the user's SINR, the set of users at the center of the sector and the set of sector users Users in the edge user set are sorted separately, so that the sector center user and the sector edge user at the division boundary can be more accurately determined, and subsequent fine division can be performed more accurately. This is because the signal-to-interference-noise ratio can more accurately characterize the channel condition of the user compared with the received power of the reference signal.

Therefore, compared with the solution in FIG. 2 , the solution in FIG. 3 can more accurately determine whether a user is a sector center user or a sector edge user.

After determining whether the user is a sector center user or a sector edge user, return to FIG. 1 , at step S120, the frequency resource used by the user may be determined according to whether the user is a sector center user or a sector edge user.

Specifically, according to the standard of the LTE system, the available frequency resources in the network are divided into three parts of equal width, and the sector-edge users in the three sectors in a cell can use the mutually orthogonal frequency resources of these three parts. frequency resources to reduce interference, and the sector center users in this sector can use the remaining 2/3 frequency resources in this sector. The macro base station uses higher power when transmitting for the sector edge users of each sector, and uses lower power when transmitting for the sector center users of the sector.

According to other embodiments of the present application, in the heterogeneous cellular network, the macro base station may also send its own transmission capability to the pico base station, so that the pico base station may use it to adjust the frequency resources used by the pico base station. As an alternative embodiment, the macro base station may also send the channel quality information of its central user and the number of users to the pico base station, so that the pico base station may dynamically adjust the frequency resources used by the pico base station. This will be described in more detail later in FIGS. 5 and 6 .

So far, the processing procedure of the resource allocation method at the macro base station end according to the embodiment of the present application has been described. For ease of understanding, the fine division process of sector center users and sector edge users will be described in more detail below in conjunction with more detailed embodiments.

In the embodiment of the present application, according to the average transmission capability of the sector center user and the average transmission capability of the sector edge user, the sector center user and the sector edge user at the division boundary can be finely divided. In a specific embodiment, when the average transmission capability of the sector center user is greater than the average transmission capability of the sector edge user set, fine division processing may be performed on the sector edge users at the division boundary, thereby finally determining that the user is a sector Area center users or sector edge users. When the average transmission capability of the sector center users is not greater than the average transmission capability of the sector edge user set, fine division processing can be performed on the sector center users at the division boundary, thereby finally determining whether the user is a sector center user or a sector user. users at the edge of the area. This will be described in more detail below in conjunction with FIG. 4 .

Fig. 4 is a flowchart of a method 400 for finely dividing sector center users and sector edge users according to an embodiment of the present application.

As shown in FIG. 4 , at step S401 , the average transmission capability γ _center of the user at the center of the sector and the average transmission capability γ _edge of the user at the edge of the sector are calculated.

Specifically, γ _center and γ _edge can be calculated by the following formula (1).

γ _center =R _center (t)*B _center /N _center (1)

in , R _i (t) represents the maximum number of bits that user i can transmit at this moment, and B _center represents the number of resource blocks available to users at the center of the sector.

γ _edge =R _edge (t)*B _edge /N _edge (2)

in , R _i (t) represents the maximum number of bits that user i can transmit at this moment, and B _edge represents the number of resource blocks available to users at the edge of the sector.

At step S402, it is judged whether the average transmission capability γ _center of the sector center user is greater than the average transmission capability γ _edge of the sector edge user.

When γ _center is greater than γ _edge , go to steps S403-S407 to perform fine division processing for sector edge users at division boundaries.

Specifically, at step S403, for the sector edge users at the division boundary, determine the fairness index F' and the average The transmission capability _γtotal ' and the fairness index F when the sector edge users are not included in the sector center user set and the average transmission capability γtotal _of all macro users in this sector. In this paper, all macro users refer to all users accessing the macro base station, which is actually the sum of central users and edge users accessing the macro base station.

In this example, define the fairness index To measure the fairness of resource allocation to sector edge users and sector center users. Among them, γ _i represents the average transmission capability of users, and I=2.

Specifically, first, for the sector edge users closest to the boundary, calculate the fairness index under the condition that the sector edge users are not included in the sector center user set as shown in the following formula (3):

In the case that the sector edge users are classified into the sector center user set, the average transmission capabilities γ _center ' and γ _edge ' of the sector edge users and sector center users are recalculated according to the following equations (4) and (5). At this time, assuming that the user who is included in is recorded as x, then:

γ _center '=R _center (t)'*B _center /(N _center +1) (4)

in

γ _edge '=R _edge (t)'*B _edge /(N _edge -1) (5)

in

The fairness index in the case that the sector edge users are classified into the sector center user set is shown in the following formula (6):

In addition, for the case where the sector edge users are included in the sector center user set and not included in the sector center user set, the average transmission capabilities _γtotal ' and γtotal _of all macro users in the sector in the corresponding sector are calculated respectively. As shown in equations (7) and (8):

Then, at step S404, according to the fairness indices F' and F and the average transmission capabilities γ _total ' and γ _total of all macro users in the sector, it is determined that the sector edge users are classified into the sector center user set The comprehensive coefficient G' of the sector edge user is not classified into the sector center user set.

In one embodiment of this application, the comprehensive coefficient G=α*F+β* _γtotal can be defined to finally measure the rationality and fairness of the division, which aims to comprehensively consider the throughput of sector users and the sector center The balance of user and sector edge user transmission capability fairness. Among them, α represents the weight of fairness of sector center users and sector edge users, and β represents the weight of sector user throughput. The values of α and β are both in the range of 0-1.

Next, at step S405, it is judged whether the comprehensive coefficient G' when the sector edge users are included in the sector central user set is greater than the comprehensive coefficient G when the sector edge users are not included in the sector central user set.

Specifically, it is judged here whether α*F'+β* _γtotal ' is greater than α*F+β* _γtotal , that is, whether G' is greater than G.

When G' is greater than G, enter step S406, and divide the sector edge users into the sector center user set. And, for the sector edge users at the boundary of the new division, the above steps S403-S407 are repeated until the comprehensive coefficient when the sector edge users are included in the sector center user set is not greater than that of the sector edge users not included. For the comprehensive coefficient in the case of a set of users in the center of the sector, proceed to step S407.

More specifically, when at S406, the sector edge users at the division boundary at this time are classified into the sector center user set, for example, when the sector edge user U _edge1 with the largest SINR is classified into the sector center When users are assembled, next, step S401-S405 is repeatedly executed for the sector edge user U _edge2 with the second largest SINR. At this time, the number of users at the center of the sector becomes N _center +1, and the number of users at the edge of the sector becomes N _edge -1. If it is determined in S405 that the G' calculated for the user U _edge2 is not greater than G when the user U _edge2 is not included in the sector center user set, then enter step S407 and end the user division of the macro base station. If it is determined in S405 that G' calculated for the user U _edge2 is greater than G, the user U _edge2 is also included in the sector center user set. At this time, the number of users at the center of the sector becomes N _center +2, and the number of users at the edge of the sector becomes N _edge -2. On this basis, continue to repeat steps S401-S405 for the sector edge user U _edge3 (whose SINR is lower than that of U _edge2 ) at the division boundary at this time. By analogy, until G' calculated for sector edge users at the division boundary is not greater than G.

When G' is not greater than G, go to step S407. At step S407, the sector edge user at the division boundary at this time is not included in the sector center user set. At this point, the division of users in the macro base station is completed.

Returning to step S402, when γ _center is not greater than γ _edge , go to steps S408-S412 to perform fine division processing for sector edge users at division boundaries.

Specifically, at step S408, for the sector center user at the division boundary, determine the fairness index F' and the average value of all macro users in the sector when the sector center user is included in the sector edge user set The transmission capability _γtotal ' and the fairness index F when the sector center user is not included in the sector edge user set and the average transmission capability γtotal _of all macro users in this sector.

As mentioned earlier, in this embodiment, the definition of fairness index To measure the fairness of resource allocation to sector edge users and sector center users. Among them, γ _i represents the average transmission capability of users, and I=2.

Specifically, first, for the sector center user closest to the boundary, the fairness index under the condition that the sector center user is not included in the sector edge user set can be calculated according to the following formula (9):

When the sector center user is classified into the sector edge user set, the average transmission capabilities γ _center ' and γ _edge ' of the sector edge user and the sector center user are recalculated according to the following equations (10) and (11). At this time, assuming that the user who is included in is recorded as x, then:

γ _center '=R _center (t)'*B _center /(N _center -1) (10)

in

γ _edge '=R _edge (t)'*B _edge /(N _edge +1) (11)

in

The fairness index in the case that the sector center user is classified into the sector edge user set is shown in the following formula (12):

In addition, for the cases where the sector center users are included in the sector edge user set and not included in the sector edge user set, the average transmission capabilities _γtotal ' and γtotal _of all macro users in the corresponding sector are calculated respectively. As shown in equations (13) and (14) below:

Then, at step S409, according to the fairness indices F' and F and the average transmission capabilities _γtotal ' and _γtotal of all macro users in the sector, it is determined that the user at the center of the sector is included in the user set at the edge of the sector The comprehensive coefficient G' of the sector center user and the comprehensive coefficient G under the condition that the sector center user is not included in the sector edge user set.

As mentioned above, in one embodiment of this application, the comprehensive coefficient G=α*F+β* _γtotal can be defined to finally measure the rationality and fairness of the division, which aims to comprehensively consider the throughput of sector users And the fairness of the transmission capacity of the sector center user and the sector edge user. Among them, α represents the weight of fairness of sector center users and sector edge users, and β represents the weight of sector user throughput. The values of α and β are both in the range of 0-1.

Next, at step S410, it is judged whether the comprehensive coefficient G' when the sector center user is included in the sector edge user set is greater than the overall coefficient G when the sector center user is not included in the sector edge user set.

Specifically, it is judged here whether α*F'+β* _γtotal ' is greater than α*F+β* _γtotal , that is, whether G' is greater than G.

When G' is greater than G, enter step S411, and divide the sector center user into the sector edge user set. And for the sector center user at the boundary of the new division, repeat the above steps S408-S410 until the comprehensive coefficient when the sector center user is included in the sector edge user set is not greater than the sector center user is not included in the sector When it comes to the comprehensive coefficient in the case of area edge user set, proceed to step S411.

More specifically, when at S411, the sector center user at the division boundary at this time is classified into the sector edge user set, for example, when the sector center user U _center1 with the smallest SINR is classified into the sector edge When the users are assembled, next, for the sector center user U _center2 with the second smallest SINR, steps S408-S410 are repeated. At this time, the number of users at the center of the sector becomes N _center -1, and the number of users at the edge of the sector becomes N _edge +1. If it is determined in S410 that the G' calculated for the user U _center2 is not greater than G when the user U _center2 is not included in the sector edge user set, then enter step S412 and end the user division of the macro base station. If it is determined in S410 that G' calculated for the user U _center2 is greater than G, the user U _edge2 is also included in the sector edge user set. At this time, the number of users at the center of the sector becomes N _center -2, and the number of users at the edge of the sector becomes N _edge +2. On this basis, continue to repeat steps S408-S412 for the sector center user U _center3 (whose SINR is lower than that of U _center2 ) at the division boundary at this time. By analogy, until G' calculated for the sector center user at the division boundary is not greater than G.

When G' is not greater than G, go to step S412. At step S412, the sector center user at the dividing boundary at this time is not included in the sector edge user set. At this point, the division of users in the macro base station is completed.

So far, the resource allocation method of the macro base station according to one aspect of the present application has been described with reference to FIG. 1 to FIG. 4 . According to the technical solution of the present application, at the end of the macro base station, by dynamically adjusting the ratio of sector edge users, the throughput of the entire network and the fairness of resource allocation are improved.

It should be understood that the resource allocation method at the macro base station end can be implemented in either a heterogeneous cellular network or a homogeneous cellular network, which is not limited in this application.

A resource allocation method at the femto base station side according to another aspect of the present application will be described below with reference to FIG. 5 and FIG. 6 . The method can be implemented in a heterogeneous cellular network.

Fig. 5 is a flowchart of a resource allocation method 500 according to another embodiment of the present application. The method 500 may include step S510. In step S510, the frequency resources used by the pico base station are adjusted according to the transmission capabilities of users accessing the sector of the macro base station and the transmission capabilities of users accessing the pico base station in the sector.

In the existing technical solutions, as mentioned above, the pico base station usually uses fixed frequency resources, that is, the pico base station and the macro base station sector center user in the same sector reuse 2/3 of the frequency resources in the sector. And the femto base station provides the same transmission power to the served users. However, in the solution of this application, the pico base station can dynamically adjust the frequency resources used by the pico base station according to the transmission capabilities of its access users and the transmission capabilities of the macro base stations in the same sector, so that the frequency resources used by the pico base station can be adjusted as much as possible Potentially reduce interference to users in the center of the macro base station sector.

According to an embodiment of the present application, before the step of adjusting the frequency resources used by the pico base station according to the transmission capabilities of the users accessing the sector of the macro base station and the transmission capabilities of the users accessing the pico base station in this sector, from the macro base station The station receives the average transmission capability of the central users accessing the sector of the macro base station.

Specifically, the aforementioned average transmission capability γ _center of the central user accessing the sector of the macro base station may be received from the macro base station.

According to another embodiment of the present application, before the step of adjusting the frequency resources used by the pico base station according to the transmission capabilities of the users accessing the sector of the macro base station and the transmission capabilities of the users accessing the pico base station in this sector, from The macro base station receives the channel quality information and the number of users of the central user accessing the sector of the macro base station. Therefore, the pico base station can estimate the transmission capability of the users of the macro base station based on the channel quality information and the number of users.

In a specific embodiment, the channel quality information of the central users accessing the sectors of the macro base station may include, for example, the maximum number of bits R _i (t) that the central users of each sector can transmit at this moment. The number of users at the center of the sector is the aforementioned N _center . According to R _i (t) and N _center , the pico base station can calculate the average transmission capability of users in the center of the sector. More preferably, the received number N _center of the sector center users or the average transmission capability γ _center of the sector center users is determined based on the aforementioned optimized method for dividing center and sector edge users at the macro base station end.

It should be understood that the channel quality information of the central user of the macro base station may also include other appropriate information, which is not limited in this application.

A more specific process of adjusting frequency resources at the pico base station side will be described below with reference to FIG. 6 . Fig. 6 is a flowchart of a resource allocation method 600 according to another embodiment of the present application.

As shown in FIG. 6 , at step S610 , the number of resource blocks to be used by the pico base station can be predicted according to the average transmission capability of users in the center of the sector of the macro base station sector.

In a specific embodiment, the average transmission capability of the pico base station users can be equal to the average transmission capability of the macro base station sector center users, that is, γ _pico = γ _center , so that the number of resource blocks B _pico that the pico base station should use can be predicted . More specifically, according to the following formula (15), when γ _pico , R _pico (t), and N _pico are known, B _pico can be obtained.

γ _pico =R _pico (t)*B _pico /N _pico (15)

in , R _i (t) represents the maximum number of bits that user i of the micro base station in the sector can transmit at this moment, and B _pico represents the number of resource blocks that can be used by the user of the micro base station in the sector.

Then, at step S620, the frequency resource used by the pico base station can be adjusted according to the predicted number of resource blocks that the pico base station should use and the predetermined number of resource blocks used by the users in the center of the sector of the macro base station.

According to the soft frequency reuse mechanism, users in the center of the sector of the macro base station and users of the pico base station use 2/3 of the frequency resources in the sector, so the predetermined number of resource blocks B _center used by the users in the center of the sector of the macro base station is known.

Specifically, the predicted number of resource blocks B _pico that should be used by the pico base station can be compared with the predetermined number of resource blocks B _center used by users in the sector center of the macro base station, and then the frequency resources used by the pico base station are adjusted according to the comparison result. In essence, it adjusts the frequency resources used by the pico base station according to the number of its own users and changes in channel quality information.

More specifically, when the number of resource blocks predicted to be used by the pico base station is lower than the predetermined number of resource blocks used by users in the sector center of the macro base station, that is, when B _pico < B _center , the range of frequency resources used by the pico base station can be reduced . In this case, if the number of users accessing the pico base station is small or the user channel quality is good, the range of frequency resources used by the pico base station can be appropriately reduced, but the frequency resources used by the pico base station in a sector should be allocated Try to avoid multiplexing to reduce the interference of pico base stations to other users in the same sector. Specifically, the range of frequency resources used by the pico base station can be narrowed so as to maximize the orthogonality with the frequency resources used by other pico base stations in the sector. In a specific embodiment, when B _pico < B _center , the femto base station can use 2/3 frequency resources as the boundary, and the femto base station that allocates resources starts to allocate resources at the end of the frequency band of the femto base station that has allocated resources, as shown in the figure 10 shown. This figure shows a schematic diagram of resource allocation and transmit power of different micro base stations in the same sector.

When the predicted number of resource blocks to be used by the pico base station is equal to the predetermined number of resource blocks used by users in the sector center of the macro base station, that is, B _pico = B _center , the range of frequency resources used by the pico base station can be kept unchanged.

When the number of resource blocks predicted to be used by the pico base station is higher than the predetermined number of resource blocks used by users at the center of the sector of the macro base station, that is, B _pico > B _center , the range of frequency resources used by the pico base station can be expanded. In this case, if the number of users accessing the pico base station is large or the channel quality of the users is poor, the range of frequency resources used by the pico base station can be extended to the frequency resources used in the edge area of the macro base station, and the frequency resources used in the edge area of the macro base station can be made The transmit power on the frequency resource of is smaller than the transmit power on the frequency resource used by the pico base station. Specifically, the range of frequency resources of the pico base station can be expanded, that is, the sum of the frequency resources used by the central area of the sector of the macro base station in the sector and the frequency resources available in the edge area of the sector of the macro base station can be used. Specifically, it can be extended to part or all of the frequency resources used by the edge area of the macro base station according to the predicted number of resource blocks B _pico that should be used by the pico base station.

So far, the resource allocation method at the femto base station side according to another aspect of the present application has been described with reference to FIG. 5 and FIG. 6 . According to the technical solution of this application, at the pico base station, by adjusting the used frequency band and power transmission according to its own load conditions, the allocation of resources and the number of users in hotspot areas match the user channel quality, thereby ensuring its own throughput. While reducing its interference to other users, it can suppress the intra-cell interference and inter-cell interference under the heterogeneous cellular network, and improve the performance of the entire network.

Similar to the resource allocation methods above, the present application also provides macro base stations and pico base stations that can implement these methods.

Referring to FIG. 7 , FIG. 7 is a schematic structural block diagram of a macro base station 700 according to an embodiment of the present application.

As shown in FIG. 7 , the macro base station 700 may include a user determining unit 710 and a frequency determining unit 720 .

Specifically, the user determining unit 710 may be configured to determine whether the user accessing each sector of the macro base station is a sector center user or a sector edge user according to the transmission capability of the user. The frequency determining unit 720 may be configured to determine the frequency resource used by the user according to whether the user is a sector center user or a sector edge user.

According to the embodiment of the present application, the macro base station 700 may further include: a sending unit, configured to send the average transmission capability of the sector center user in each sector of the macro base station to the pico base station in this sector, so that the pico base station Used for frequency resource adjustment.

According to the embodiment of the present application, the macro base station 700 may further include: a sending unit, configured to send the channel quality information and the number of users of the sector center users of each sector of the macro base station to the pico base station in the sector, so as to Used by pico base stations for frequency resource adjustment.

According to the embodiment of the present application, the user determining unit 710 may further include (not shown in the figure): a rough division subunit, which is used to perform sector center user and sector edge user access to each sector of the macro base station rough division of users; and a fine division subunit, configured to finely divide sector center users and sector edge users at division boundaries according to user transmission capabilities.

According to a specific embodiment of the present application, the rough division subunit can roughly determine the sector center user set and the sector edge user set according to the user reference signal received power.

According to a specific embodiment of the present application, the rough division subunit may further include: a sorting subunit, configured to sort the sector center user and the sector edge user according to the user's SINR, so as to determine the division boundary Sector center users and sector edge users.

According to a specific embodiment of the present application, the fine division subunit can finely divide the sector center users and sector edge users at the division boundary according to the average transmission capability of the sector center users and the average transmission capability of the sector edge users .

According to a specific embodiment of the present application, the fine division subunit may further include: a first processing subunit, configured to, when the average transmission capability of the user at the center of the sector is greater than the average transmission capability of the user set at the edge of the sector, for Sector edge users perform fine division processing; and a second processing subunit is used to execute for the sector center users at the division boundary when the average transmission capability of the sector center users is not greater than the average transmission capability of the sector edge user set Finely divided processing.

According to a more specific embodiment of the present application, the first processing subunit may further include: a first determining subunit, configured to, for a sector edge user at a division boundary, determine that the sector edge user is assigned to the sector center In the case of the user set and the fairness index and the average transmission capability of all macro users in this sector under the situation that the sector edge user is not included in the sector center user set; the second determining subunit is used to determine the The fairness index and the average transmission capability of all macro users in this sector are determined respectively when the sector edge users are included in the sector center user set and when the sector edge users are not included in the sector center users The comprehensive coefficient in the case of a set; and the first division subunit, used for when the sector edge user is classified into the sector center user set, the comprehensive coefficient is greater than the sector edge user not classified into the sector center When the comprehensive coefficient in the case of the user set is used, the sector edge users are classified into the sector center user set; and the first repeating subunit is used to repeat the above steps for the sector edge users at the new division boundary, Until the comprehensive coefficient when the sector edge user is included in the sector center user set is not greater than the integrated coefficient when the sector edge user is not included in the sector center user set.

According to a specific embodiment of the present application, the first dividing subunit may be further used: when the sector edge user is included in the sector center user set, the comprehensive coefficient of the sector center user is not greater than the sector edge When the comprehensive coefficient in the case that the user is not included in the sector center user set, the sector edge user is not included in the sector center user set.

According to a more specific embodiment of the present application, the second processing subunit may further include: a third determining subunit, configured to, for a user in the center of the sector at the division boundary, determine that the user in the center of the sector falls into the edge of the sector In the case of the user set and the fairness index and the average transmission capability of all macro users in this sector when the sector center user is not included in the sector edge user set; the fourth determination subunit is used to determine the The fairness index and the average transmission capability of all macro users in this sector are determined respectively when the sector center user is included in the sector edge user set and when the sector center user is not included in the sector edge user The comprehensive coefficient in the case of a set; the second division subunit, used for when the sector center user is classified into the sector edge user set, the comprehensive coefficient is greater than the sector center user not classified into the sector edge user When the comprehensive coefficient in the case of a set is used, the sector center user is classified into the sector edge user set; and the second repeating subunit is used to repeat the above steps for the sector center user at the new division boundary until The comprehensive coefficient when the sector center user is included in the sector edge user set is no greater than the integrated coefficient when the sector center user is not included in the sector edge user set.

According to a specific embodiment of the present application, the second dividing subunit may be further used for: when the sector center user is included in the sector edge user set, the comprehensive coefficient is not greater than the sector center user not included in the sector When the comprehensive coefficient in the case of the zone edge user set is used, the sector center user is not included in the sector edge user set.

Referring to FIG. 8 , FIG. 8 is a schematic structural block diagram of a femto base station 800 according to an embodiment of the present application.

As shown in FIG. 8 , the femto base station 800 may include an adjustment unit 810 . The adjustment unit 810 may be configured to adjust frequency resources used by the pico base station according to the transmission capabilities of users accessing the sector of the macro base station and the transmission capabilities of users accessing the pico base station in the sector.

According to an embodiment of the present application, the femto base station 800 may further include (not shown in the figure): a receiving unit configured to receive from the macro base station the average transmission capability of the central user accessing the sector of the macro base station.

According to another embodiment of the present application, the pico base station 800 may further include (not shown in the figure): a receiving unit, configured to receive the channel quality information and the number of users of the central user accessing the sector of the macro base station from the macro base station .

According to an embodiment of the present application, the adjustment unit 810 may further include (not shown in the figure): a prediction subunit, configured to predict the resource blocks that the pico base station should use according to the average transmission capability of the sector center users of the macro base station sector number; and an adjustment subunit, configured to adjust the frequency resources used by the pico base station according to the predicted number of resource blocks to be used by the pico base station and the predetermined number of resource blocks used by users in the center of the macro base station sector.

According to a specific embodiment of the present application, the adjustment subunit may further include: a shrinking subunit, configured to shrink The range of frequency resources used by the pico base station; the maintenance subunit is used to keep the range of frequency resources used by the pico base station from the and an expanding subunit, used to expand the range of frequency resources used by the pico base station when the predicted number of resource blocks to be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the macro base station sector.

According to a more specific embodiment of the present application, when the number of resource blocks predicted to be used by the pico base station is lower than the predetermined number of resource blocks used by users in the center of the sector of the macro base station, the narrowing subunit narrows down the range of frequency resources used by the pico base station, so that It is orthogonal to the frequency resources used by other pico base stations in the sector to the maximum extent.

According to a more specific embodiment of the present application, when the number of resource blocks predicted to be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the macro base station sector, the expansion subunit can expand the range of frequency resources used by the pico base station to the frequency resource used by the edge area of the macro base station, and the transmit power on the frequency resource used by the edge area of the macro base station is smaller than the transmit power on the frequency resource used by the pico base station.

So far, the macro base station and the pico base station according to the embodiments of the present application have been described. The processing therein corresponds to the processing of the resource allocation method described above. Therefore, for the specific details, reference may be made to the resource allocation method described above, which will not be repeated here.

Correspondingly, the embodiment of the present application also provides a communication system.

Referring to FIG. 9 , FIG. 9 is a schematic structural block diagram of a communication system 900 according to an embodiment of the present application.

As shown in FIG. 9 , a communication system 900 may include a macro base station 910 and a pico base station 920 . Specifically, the macro base station 910 may determine whether the user accessing the sector is a sector center user or a sector edge user according to the transmission capability of the user accessing the sector, and then determine the frequency resource used by the user. The pico base station 920 may adjust the frequency resources used by the pico base station according to the transmission capabilities of users accessing the sector of the macro base station and the transmission capabilities of users accessing the pico base station.

The processing of the macro base station 910 is similar to the processing of the macro base station 700 described above, and the processing of the pico base station 920 is similar to the processing of the pico base station 800 described above. Therefore, for specific details, refer to the previously described macro base station 700 and pico base station The processing of 800 will not be repeated here.

The communication system according to the embodiment of the present application has been described so far. According to the communication system of the present application, at the end of the macro base station, by dynamically adjusting the ratio of sector edge users, the throughput of the entire network and the fairness of resource allocation are improved. In addition, on the pico base station side, by adjusting the used frequency band and power transmission according to its own load conditions, the allocation of resources and the number of users in the hotspot area match the demand, thereby reducing its impact on other users while ensuring its own throughput. interference, which can suppress the intra-cell interference and inter-cell interference under the heterogeneous cellular network. Therefore, it is possible to improve the throughput of the entire network and improve the performance of the entire network while suppressing intra-cell/inter-cell interference.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer-readable media, in the form of random access memory (RAM) and/or nonvolatile memory, such as read-only memory (ROM) or flash memory (flashRAM). Memory is an example of computer readable media.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, devices, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above description is only an embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims (37)

1. A resource allocation method, characterized in that, comprising: Perform rough division of sector center users and sector edge users for users accessing each sector of the macro base station; and According to the user's average transmission capability, the sector center user and the sector edge user at the division boundary are finely divided, wherein the user's average transmission capability is based on the maximum number of bits that the user can transmit at this moment, the user can use determined by the number of resource blocks and the number of sector center users or sector edge users; Determine the frequency resource used by the user according to whether the user is a sector center user or a sector edge user. 2. The method according to claim 1, further comprising: The average transmission capability of the sector center user in each sector of the macro base station is sent to the pico base station in the sector, so that the pico base station can be used for frequency resource adjustment. 3. The method according to claim 1, further comprising: Sending the channel quality information and the number of users in the sector center of each sector of the macro base station to the pico base station in this sector, so that the pico base station is used for frequency resource adjustment. 4. The method according to claim 1, characterized in that the step of roughly dividing the sector center users and sector edge users for users accessing each sector of the macro base station further comprises: According to the received power of the user's reference signal, the user set at the center of the sector and the set of users at the edge of the sector are roughly determined. 5. The method according to claim 1, characterized in that, after the step of roughly dividing the users accessing each sector of the macro base station into sector center users and sector edge users and according to the user's average Transmission capacity, before the step of finely dividing the sector center users and sector edge users at the division boundary, further includes: According to the SINR of the users, the sector center users and the sector edge users are sorted, so as to determine the sector center users and the sector edge users at the division boundary. 6. The method according to any one of claims 1-5, characterized in that, according to the average transmission capability of the users, the step of finely dividing the sector center users and sector edge users at the division boundary further comprises : According to the average transmission capability of the sector center user and the average transmission capability of the sector edge user, the sector center user and the sector edge user at the dividing boundary are finely divided. 7. The method according to claim 6, characterized in that, according to the average transmission capability of the sector center user and the average transmission capability of the sector edge user, the sector center user and the sector edge user at the division boundary are carried out The steps of fine division further include: When the average transmission capability of the sector center users is greater than the average transmission capability of the sector edge user set, performing a fine division process for the sector edge users at the division boundary; and When the average transmission capability of the sector center users is not greater than the average transmission capability of the sector edge user set, fine division processing is performed on the sector center users at the division boundary. 8. The method according to claim 7, wherein the step of performing fine division processing for sector edge users at the division boundary further comprises: For the sector edge users at the division boundary, determine the fairness under the condition that the sector edge users are included in the sector center user set and the sector edge users are not included in the sector center user set performance index and the average transmission capacity of all macro users in this sector; According to the fairness index and the average transmission capability of all macro users in this sector, determine whether the sector edge user is included in the sector center user set and the sector edge user is not included in the sector Comprehensive coefficient in the case of central user set; When the comprehensive coefficient when the sector edge user is included in the sector central user set is greater than the comprehensive coefficient when the sector edge user is not included in the sector central user set, classify the sector edge user into the sector center user set A set of sector-centric users; and For the sector edge users at the boundary of the new division, repeat the above steps until the comprehensive coefficient when the sector edge users are included in the sector center user set is not greater than the sector edge users not included in the sector center So far the comprehensive coefficient in the case of user collection. 9. The method according to claim 8, wherein the step of performing fine division processing for sector edge users at the division boundary further comprises: When the comprehensive coefficient of the sector center user under the condition that the sector edge user is included in the sector center user set is not greater than the comprehensive coefficient under the case that the sector edge user is not included in the sector center user set, the The sector edge users are classified into the sector center user set. 10. The method according to claim 7, wherein the step of performing a fine division process for the sector center users at the division boundary further comprises: For the sector center user at the division boundary, determine the fairness under the condition that the sector center user is included in the sector edge user set and the sector center user is not included in the sector edge user set performance index and the average transmission capacity of all macro users in this sector; According to the fairness index and the average transmission capability of all macro users in this sector, determine whether the user in the center of the sector is included in the set of edge users in the sector and the user in the center of the sector is not included in the sector Comprehensive coefficient in the case of edge user set; When the comprehensive coefficient of the case where the sector center user is included in the sector edge user set is greater than the comprehensive coefficient when the sector center user is not included in the sector edge user set, classify the sector center user into a set of sector edge users; and For the sector center users at the new division boundary, repeat the above steps until the comprehensive coefficient when the sector center user is included in the sector edge user set is not greater than the sector center user is not included in the sector edge So far the comprehensive coefficient in the case of user collection. 11. The method according to claim 10, characterized in that the step of performing fine division processing for sector edge users at the division boundary further comprises: When the comprehensive coefficient of the case where the sector center user is included in the sector edge user set is not greater than the comprehensive coefficient when the sector center user is not included in the sector edge user set, the sector center user is not included Included in the sector edge user set. 12. A resource allocation method, comprising: Determining the average transmission capability of the central user accessing the sector of the macro base station, wherein the central user accessing the sector of the macro base station is the sector center user and the sector edge of the user accessing each sector of the macro base station Rough division of users and fine division of sector center users and sector edge users at the boundary of the division according to the average transmission capacity of users, which is based on the user's average transmission capacity at this moment Determined by the maximum number of bits, the number of resource blocks that users can use, and the number of sector center users or sector edge users; According to the average transmission capability of the central users accessing the sector of the macro base station and the average transmission capability of the users accessing the pico base station in the sector, adjust the frequency resources used by the pico base station, wherein the average transmission capability of the users of the pico base station can be set Equal to the average transmission capacity of the central user of the macro base station sector. 13. The method according to claim 12, wherein determining the average transmission capability of a central user accessing a macro base station sector comprises: The average transmission capability of the central user accessing the sector of the macro base station is directly received from the macro base station. 14. The method according to claim 12, wherein determining the average transmission capability of a central user accessing a macro base station sector comprises: receiving the channel quality information and the number of users of the central user accessing the sector of the macro base station from the macro base station; Determine the average transmission capability of the central users accessing the macro base station sector according to the channel quality information and the number of users of the central users accessing the macro base station sector. 15. The method according to claim 12, characterized in that, according to the average transmission capability of the central users accessing the sector of the macro base station and the average transmission capability of the users accessing the pico base station in the sector, adjusting the The steps of the frequency resources further include: Predicting the number of resource blocks to be used by the pico base station according to the average transmission capability of the sector center users of the macro base station sector; and The frequency resources used by the pico base station are adjusted according to the predicted number of resource blocks to be used by the pico base station and the predetermined number of resource blocks used by users in the center of the sector of the macro base station. 16. The method according to claim 15, characterized in that the step of adjusting the frequency resources used by the pico base station according to the predicted number of resource blocks that the pico base station should use and the predetermined number of resource blocks used by users in the center of the macro base station sector Further includes: When the number of resource blocks predicted to be used by the pico base station is lower than the predetermined number of resource blocks used by users in the center of the sector of the macro base station, reduce the range of frequency resources used by the pico base station; When the number of resource blocks predicted to be used by the pico base station is equal to the predetermined number of resource blocks used by users in the center of the sector of the macro base station, keeping the range of frequency resources used by the pico base station unchanged; and When the number of resource blocks predicted to be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the sector of the macro base station, the range of frequency resources used by the pico base station is expanded. 17. The method according to claim 16, characterized in that, when the predicted number of resource blocks that the pico base station should use is lower than the predetermined number of resource blocks used by users in the center of the macro base station sector, the frequency resources used by the pico base station are reduced The scope steps further include: The range of frequency resources used by the pico base station is reduced to maximize the orthogonality with the frequency resources used by other pico base stations in the sector. 18. The method according to claim 16, characterized in that, when the number of resource blocks predicted to be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the macro base station sector, expanding the frequency resources used by the pico base station The scope steps further include: When the predicted number of resource blocks that should be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the sector of the macro base station, extending the range of frequency resources used by the pico base station to the frequency resources used by the sector edge area of the macro base station, and The transmit power on the frequency resource used in the sector edge area of the macro base station is smaller than the transmit power on the frequency resource used by the pico base station. 19. A macro base station, comprising: Roughly divide subunits, which are used to roughly divide the users accessing each sector of the macro base station into sector center users and sector edge users; and The fine division subunit is used to finely divide the sector center user and the sector edge user at the division boundary according to the average transmission capability of the user, wherein the average transmission capability of the user is based on the transmission capacity of the user at this moment Determined by the maximum number of bits, the number of resource blocks that users can use, and the number of sector center users or sector edge users; The frequency determining unit is configured to determine the frequency resource used by the user according to whether the user is a sector center user or a sector edge user. 20. The macro base station according to claim 19, further comprising: The sending unit is configured to send the average transmission capability of the sector center user in each sector of the macro base station to the pico base station in the sector, so that the pico base station can use it for frequency resource adjustment. 21. The macro base station according to claim 19, further comprising: The sending unit is configured to send the channel quality information and the number of users in the sector center of each sector of the macro base station to the pico base station in the sector for frequency resource adjustment by the pico base station. 22. The macro base station according to claim 19, wherein the rough division subunit roughly determines a sector center user set and a sector edge user set according to user reference signal received power. 23. The macro base station according to claim 19, wherein the user determining unit further comprises: The sorting subunit is configured to sort the sector center user and the sector edge user according to the user's SINR, so as to determine the sector center user and the sector edge user at the dividing boundary. 24. The macro base station according to any one of claims 19-23, characterized in that, the fine division subunit is based on the average transmission capability of users at the center of the sector and the average transmission capability of users at the edge of the sector, for Sector center users and sector edge users at the border are finely divided. 25. The macro base station according to claim 24, wherein the fine division subunit further comprises: The first processing subunit is used to perform a fine division process on the sector edge users at the division boundary when the average transmission capability of the sector center users is greater than the average transmission capability of the sector edge user set; and The second processing subunit is configured to perform fine division processing on the sector center users at the division boundary when the average transmission capability of the sector center users is not greater than the average transmission capability of the sector edge user set. 26. The macro base station according to claim 25, wherein the first processing subunit further comprises: The first determination subunit is configured to determine, for the sector edge users at the division boundary, that the sector edge users are included in the sector center user set and that the sector edge users are not included in the sector The fairness index and the average transmission capacity of all macro users in this sector in the case of central user collection; The second determining subunit is used to determine, according to the fairness index and the average transmission capability of all macro users in the sector, whether the sector edge user is included in the sector center user set and the sector edge user group. The comprehensive coefficient in the case where the users at the edge of the zone are not included in the set of users at the center of the sector; and The first inclusion subunit is used for when the comprehensive coefficient when the sector edge user is included in the sector center user set is greater than the sector edge user is not included in the sector center user set. classifying the sector edge users into a set of sector center users; and The first repetition subunit is used for the sector edge users at the new division boundary, so that the first division subunit repeats the division operation until the sector edge users are divided into the sector center user set The comprehensive coefficient below is no greater than the comprehensive coefficient under the condition that the sector edge users are not included in the sector central user set. 27. The macro base station according to claim 26, wherein the first adding subunit is further used for: When the comprehensive coefficient of the sector center user under the condition that the sector edge user is included in the sector center user set is not greater than the comprehensive coefficient under the case that the sector edge user is not included in the sector center user set, the The sector edge users are classified into the sector center user set. 28. The macro base station according to claim 25, wherein the second processing subunit further comprises: The third determining subunit is used to determine, for the sector center user at the division boundary, that the sector center user is included in the sector edge user set and that the sector center user is not included in the sector The fairness index and the average transmission capacity of all macro users in this sector in the case of edge user set; The fourth determining subunit is used to determine, according to the fairness index and the average transmission capability of all macro users in the sector, whether the user at the center of the sector is included in the user set at the edge of the sector and the user at the edge of the sector. The comprehensive coefficient under the condition that users in the center of the area are not included in the set of users at the edge of the sector; The second inclusion subunit is used for when the comprehensive coefficient when the sector center user is included in the sector edge user set is greater than the sector center user is not included in the sector edge user set. dividing the sector center user into a sector edge user set; and The second repetition subunit is used to repeat the division operation for the sector center user at the new division boundary, so that the second division subunit repeats the division operation until the sector center user is divided into the sector edge user set The comprehensive coefficient below is no greater than the comprehensive coefficient under the condition that the sector center user is not included in the sector edge user set. 29. The macro base station according to claim 28, wherein the second adding subunit is further used for: When the comprehensive coefficient of the case where the sector center user is included in the sector edge user set is not greater than the comprehensive coefficient when the sector center user is not included in the sector edge user set, the sector center user is not included Included in the sector edge user set. 30. A pico base station, characterized by comprising: A determining unit, configured to determine the average transmission capability of central users accessing a sector of a macro base station, wherein the central user accessing a sector of a macro base station is a sector-centric Rough division of users and sector edge users, and fine division of sector center users and sector edge users at the division boundary according to the average transmission capability of users, the average transmission capability of users is based on user The maximum number of bits that can be transmitted at this moment, the number of resource blocks that users can use, and the number of sector center users or sector edge users are determined; The adjustment unit is used to adjust the frequency resources used by the pico base station according to the average transmission capability of users accessing the sector of the macro base station and the average transmission capability of users accessing the pico base station in the sector, wherein the users of the pico base station can be configured to The average transmission capability of is equal to the average transmission capability of the central user of the macro base station sector. 31. The femto base station according to claim 30, further comprising: The receiving unit is configured to directly receive the average transmission capability of the central users accessing the sector of the macro base station from the macro base station. 32. The femto base station according to claim 30, further comprising: a receiving unit, configured to receive from the macro base station the channel quality information and the number of users of the central user accessing the sector of the macro base station; The determining unit is configured to determine the average transmission capability of the central user accessing the macro base station sector according to the channel quality information and the number of users of the central user accessing the macro base station sector. 33. The femto base station according to claim 30, wherein the adjusting unit further comprises: The prediction subunit is used to predict the number of resource blocks that should be used by the pico base station according to the average transmission capability of the sector center users of the macro base station sector; and The adjustment subunit is used to adjust the frequency resources used by the pico base station according to the predicted number of resource blocks to be used by the pico base station and the predetermined number of resource blocks used by users in the center of the sector of the macro base station. 34. The femto base station according to claim 33, wherein the adjusting subunit further comprises: The narrowing subunit is used to reduce the range of frequency resources used by the pico base station when the predicted number of resource blocks that should be used by the pico base station is lower than the predetermined number of resource blocks used by users in the center of the sector of the macro base station; The maintaining subunit is used to keep the range of frequency resources used by the pico base station unchanged when the predicted number of resource blocks to be used by the pico base station is equal to the predetermined number of resource blocks used by users in the center of the sector of the macro base station; and The expansion subunit is used to expand the range of frequency resources used by the pico base station when the predicted number of resource blocks to be used by the pico base station is higher than the predetermined number of resource blocks used by users in the center of the sector of the macro base station. 35. The pico base station according to claim 34, wherein when the predicted number of resource blocks that the pico base station should use is lower than the predetermined number of resource blocks used by users in the center of the macro base station sector, the shrinking subunit shrinks The frequency resource range used by the pico base station is maximally orthogonal to the frequency resources used by other pico base stations in the sector. 36. The pico base station according to claim 34, characterized in that, when the predicted number of resource blocks that the pico base station should use is higher than the predetermined number of resource blocks used by users in the center of the macro base station sector, the expansion subunit will The range of frequency resources used by the pico base station extends to the frequency resources used by the sector edge area of the macro base station, and the transmit power on the frequency resources used by the sector edge area of the macro base station is smaller than that on the frequency resources used by the pico base station. 37. A communication system, comprising a macro base station and a pico base station, characterized in that, The macro base station determines whether the user is a sector center user or a sector edge user according to the average transmission capability of users accessing the sector, and then determines the frequency resource used by the user, wherein the average transmission capability of the user is It is determined according to the maximum number of bits that the user can transmit at this moment, the number of resource blocks that the user can use, and the number of users at the center of the sector or users at the edge of the sector; and The pico base station adjusts the frequency resources used by the pico base station according to the average transmission capability of central users accessing the sector of the macro base station and the average transmission capability of users accessing the pico base station, where the average of the users of the pico base station can be set The transmission capacity is equal to the average transmission capacity of the central users of the macro base station sector.