CN103987079A

CN103987079A - Adjacent region interference determination method and device

Info

Publication number: CN103987079A
Application number: CN201410232025.4A
Authority: CN
Inventors: 贺媛; 谌丽; 秦飞
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT
Priority date: 2014-05-28
Filing date: 2014-05-28
Publication date: 2014-08-13

Abstract

The invention discloses an adjacent region interference determination method and device. The method comprises the steps that a centralized node obtains a first adjacent region measurement result reported by each base station, wherein each first adjacent region measurement result is obtained by conducting adjacent region measurement on each measurement frequency point after the corresponding base station is started up; the centralized node determines adjacent region interference relation information of each base station according to the first adjacent region measurement result reported by each base station, wherein the adjacent region interference relation information records interference adjacent regions of the base stations. Due to the fact that the base stations, instead of UE, directly conduct adjacent region measurement, the interference adjacent regions can be determined in time, and accuracy of determining the interference adjacent regions is improved. Due to the fact that the base stations directly conduct adjacent region measurement, the phenomenon that a plurality of pieces of UE report different measurement results for the same adjacent region can be avoided, and the implementation complexity for determining the interference adjacent regions is reduced; in addition, the adjacent region interference relation of each base station is determined by the centralized node, and centralized management and maintenance of the adjacent region interference relations are achieved.

Description

Method and device for determining adjacent cell interference

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for determining interference in a neighboring cell.

Background

In a Wireless communication system, signals are transmitted through a Wireless environment, and when Multiple Access points, such as base stations in a cellular Network and Access Points (APs) in a Wireless Local Area Network (WLAN) system, are deployed, if adjacent Access points use the same operating Frequency, in most systems, such as an Orthogonal Frequency Division Multiplexing (OFDM) system and a Code Division Multiple Access (CDMA) system, adjacent cell interference may be caused, so that spectrum resources may not be effectively used, and transmission performance of the Wireless system may be reduced.

An Interference Coordination technology in a current Long Term Evolution (LTE) system includes a cell Interference Coordination (ICIC) technology, where a base station and an adjacent base station perform load indication and high Interference indication information interaction of adjacent cells, and a distributed Interference Coordination mode is adopted between the cells, and the Coordination mode may be: if the load of the cell 1 is high and the interference is serious, the central users of the adjacent cell 2 can use all frequency band resources of the cell, so that the resource allocation of edge users is reduced or the edge users only use partial resources, and the signal transmission of the users of the cell 1 is ensured.

In the current LTE system, a base station performs measurement configuration for User Equipment (UE), the UE performs neighbor cell measurement, and when a measurement report condition is satisfied, the UE reports a measurement result, and the base station determines an interfering neighbor cell according to the measurement result, and determines whether the UE is located in a cell center or an edge, and which neighbor cell the edge UE is adjacent to, thereby performing ICIC.

When the base station is just started, no UE is accessed, the UE cannot be triggered to carry out neighbor cell measurement, and the UE triggers and reports a measurement result according to conditions, so that the base station cannot determine an interference neighbor cell in time, and the accuracy of determining the interference neighbor cell is influenced. When the UE reports the measurement result, a plurality of UEs may report the measurement result, the measurement results reported by the UEs for the same neighbor cell are different, and the implementation complexity of the base station determining the interference neighbor cell according to the measurement results of the UEs is high.

Disclosure of Invention

The present invention provides a method and an apparatus for determining neighboring cell interference, so as to solve the above problems.

The purpose of the invention is realized by the following technical scheme:

a method for determining neighbor cell interference comprises the following steps:

the centralized node acquires a first neighbor cell measurement result reported by each base station, wherein the first neighbor cell measurement result is obtained by performing neighbor cell measurement on each measurement frequency point after the base station is started;

and the centralized node determines the interference relationship information of the adjacent cells of each base station according to the first adjacent cell measurement result reported by each base station, wherein the interference relationship information of the adjacent cells records the interference adjacent cells of the base stations.

According to the technical scheme provided by the embodiment of the invention, the base station directly carries out the neighbor cell measurement instead of the UE, so that the interfering neighbor cell can be determined in time, and the accuracy of determining the interfering neighbor cell is improved. The base station directly carries out the neighbor cell measurement, thereby avoiding the situation that a plurality of UE report different measurement results aiming at the same neighbor cell and reducing the realization complexity of determining the interference neighbor cell. In addition, the centralized node determines the adjacent cell interference relationship of each base station, thereby realizing the centralized management and maintenance of the adjacent cell interference relationship. Compared with distributed management and maintenance of the adjacent cell interference relationship in the ICIC technology, the technical scheme provided by the embodiment of the invention is more suitable for the scene of intensive deployment of the base station.

Preferably, the first neighbor cell measurement result includes identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of the measurement quantity.

Based on any of the above method embodiments, preferably, before the centralized node obtains the first neighbor measurement result reported by the base station, the method further includes:

and the centralized node sends the information of the measurement frequency points and/or the threshold value of the measurement quantity to the base station.

Based on any of the above method embodiments, preferably, the method further comprises:

and the centralized node modifies the adjacent cell interference relationship information of the base station with the changed adjacent cell interference relationship.

Preferably, the changing of the neighboring cell interference relationship of the base station includes:

the working frequency band of the cell of the base station changes; or,

the working frequency band of the adjacent area of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

Preferably, the change of the operating frequency band of the cell of the base station includes:

the working frequency point of the working frequency band of the cell of the base station is unchanged, but the bandwidth is changed; or,

the working frequency point of the working frequency band of the cell of the base station is changed, and the bandwidth is changed; or,

the working frequency point of the working frequency band of the cell of the base station is unchanged, but the bandwidth is unchanged; or,

cell increase of the base station; or,

the cell of the base station decreases.

Preferably, the modifying, by the centralized node, information of interference relationship between neighboring cells of the base station whose operating frequency band of the cell changes includes:

the centralized node determines that the historical measurement result of the base station with the changed working frequency band of the cell is invalid;

and the centralized node instructs the base station to perform neighbor cell measurement to obtain a second neighbor cell measurement result, and modifies the neighbor cell interference relationship information of the base station according to the second neighbor cell measurement result reported by the base station.

after the base station is started, performing neighbor cell measurement on each measurement frequency point;

the base station reports a first neighbor cell measurement result obtained by neighbor cell measurement to a centralized node, so that the centralized node determines neighbor cell interference relationship information of the base station according to the first neighbor cell measurement result, and the neighbor cell interference relationship information records interference neighbor cells of the base station.

Based on any of the above embodiments of the method on the base station side, preferably, before the base station performs neighbor cell measurement on each measurement frequency point after starting up, the method further includes:

the base station receives the information of the measurement frequency point and/or the threshold value of the measurement quantity sent by the centralized node;

the base station performs neighbor cell measurement on each measurement frequency point, and the neighbor cell measurement comprises the following steps:

the base station determines each measuring frequency point according to the information of the measuring frequency points, and performs neighbor cell measurement on each measuring frequency point;

the base station reports a first neighbor cell measurement result obtained by neighbor cell measurement to the centralized node, and the method comprises the following steps:

and the base station carries the measured value of the measured quantity which is obtained by measuring the adjacent cells and is larger than the threshold value of the measured quantity in the first adjacent cell measuring result and reports the measured value to the centralized node.

the base station determines adjacent cell interference relationship information of the base station according to a first adjacent cell measurement result obtained by adjacent cell measurement, and the adjacent cell interference relationship information records an interference adjacent cell of the base station.

According to the technical scheme provided by the embodiment of the invention, the base station directly carries out the neighbor cell measurement instead of the UE, so that the interfering neighbor cell can be determined in time, and the accuracy of determining the interfering neighbor cell is improved. The base station directly carries out the neighbor cell measurement, thereby avoiding the situation that a plurality of UE report different measurement results aiming at the same neighbor cell and reducing the realization complexity of determining the interference neighbor cell.

Based on any of the above embodiments of the distributed method, preferably, the method further comprises:

and when the adjacent cell interference relationship changes, the base station modifies the adjacent cell interference relationship information.

Preferably, the neighboring cell interference relationship changes, including:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

cell increase of the base station; or,

the cell of the base station decreases.

Preferably, the modifying, by the base station, the neighboring cell interference relationship information includes:

the base station determines that the historical measurement result is invalid;

and the base station performs neighbor cell measurement to obtain a second neighbor cell measurement result, and modifies neighbor cell interference relationship information according to the second neighbor cell measurement result.

Based on the same inventive concept as the method, the embodiment of the invention provides a centralized node, which comprises:

the measurement result acquisition module is used for acquiring a first adjacent cell measurement result reported by each base station, wherein the first adjacent cell measurement result is obtained by performing adjacent cell measurement after the base station is started;

and the neighbor cell interference relation recording module is used for determining neighbor cell interference relation information of each base station according to the first neighbor cell measurement result reported by each base station, and the neighbor cell interference relation information records the interference neighbor cells of the base stations.

Based on the foregoing embodiment of any centralized node, preferably, the method further includes:

and the neighbor cell information sending module is used for sending the information of the measurement frequency point and/or the threshold value of the measurement quantity to the base station before the measurement result acquisition module acquires the first neighbor cell measurement result reported by the base station.

Based on any of the above embodiments of the centralized node, preferably, the neighboring cell interference relationship recording module is further configured to:

and modifying the adjacent cell interference relationship information of the base station with the changed adjacent cell interference relationship.

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

cell increase of the base station; or,

the cell of the base station decreases.

Preferably, when modifying the neighboring cell interference relationship information of the base station whose operating frequency band of the cell changes, the neighboring cell interference relationship recording module is configured to:

determining that the historical measurement result of the base station with the changed working frequency band of the cell is invalid;

and indicating the base station to carry out neighbor cell measurement to obtain a second neighbor cell measurement result, and modifying the neighbor cell interference relationship information of the base station according to the second neighbor cell measurement result reported by the base station.

a processor configured to execute a computer program having the following functions: acquiring a first adjacent cell measurement result reported by each base station, wherein the first adjacent cell measurement result is obtained by performing adjacent cell measurement after the base station is started; respectively determining adjacent cell interference relationship information of each base station according to a first adjacent cell measurement result reported by each base station, wherein the adjacent cell interference relationship information records an interference adjacent cell of the base station;

a memory configured to hold code of the computer program.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a base station, including:

the neighbor cell measurement module is used for carrying out neighbor cell measurement on each measurement frequency point after the base station is started;

and the measurement result reporting module is used for reporting a first adjacent cell measurement result obtained by adjacent cell measurement to the centralized node so that the centralized node determines adjacent cell interference relationship information of the base station according to the first adjacent cell measurement result, and the adjacent cell interference relationship information records the interference adjacent cell of the base station.

Based on any of the above embodiments of the base station, preferably, the base station further includes a measurement information receiving module, configured to receive, after the base station is powered on, information of measurement frequency points and/or a threshold value of measurement quantity sent by the centralized node;

the neighbor cell measurement module is specifically configured to: determining each measuring frequency point according to the information of the measuring frequency points, and measuring adjacent regions on each measuring frequency point;

the measurement result reporting module is specifically configured to: and carrying the measured value of the measured quantity which is obtained by the adjacent cell measurement and is larger than the threshold value of the measured quantity in the first adjacent cell measurement result and reporting the first adjacent cell measurement result to the centralized node.

a processor configured to execute a computer program having the following functions: after the base station is started, performing neighbor cell measurement on each measurement frequency point; reporting a first neighbor cell measurement result obtained by neighbor cell measurement to a centralized node so that the centralized node determines neighbor cell interference relationship information of the base station according to the first neighbor cell measurement result, wherein the neighbor cell interference relationship information records interference neighbor cells of the base station;

a memory configured to hold code of the computer program.

the neighbor cell measurement module is used for carrying out neighbor cell measurement after the base station is started;

and the neighbor cell interference relation recording module is used for determining neighbor cell interference relation information of the base station according to a first neighbor cell measurement result obtained by neighbor cell measurement, and the neighbor cell interference relation information records an interference neighbor cell of the base station.

Preferably, the neighboring cell interference relationship recording module is further configured to:

and when the adjacent cell interference relationship changes, modifying the adjacent cell interference relationship information.

Preferably, the neighboring cell interference relationship changes, including:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

cell increase of the base station; or,

the cell of the base station decreases.

Preferably, when the neighboring cell interference relationship information is modified, the neighboring cell interference relationship recording module is configured to:

determining that the historical measurement is invalid;

and performing neighbor cell measurement to obtain a second neighbor cell measurement result, and modifying neighbor cell interference relationship information according to the second neighbor cell measurement result.

a processor configured to execute a computer program having the following functions: carrying out neighbor cell measurement after the base station is started; determining neighbor cell interference relationship information of the base station according to a first neighbor cell measurement result obtained by neighbor cell measurement, wherein the neighbor cell interference relationship information records an interference neighbor cell of the base station;

a memory configured to hold code of the computer program.

Drawings

FIG. 1 is a schematic diagram of a method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another method provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of another method provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of another method provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another method provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of another method provided by an embodiment of the present invention;

fig. 7 is a schematic diagram of a centralized node according to an embodiment of the present invention;

fig. 8 is a schematic diagram of another centralized node according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a base station according to an embodiment of the present invention;

fig. 10 is a schematic diagram of another base station according to an embodiment of the present invention;

fig. 11 is a schematic diagram of another base station according to an embodiment of the present invention.

Detailed Description

Before describing the technical solution provided by the present invention through a specific embodiment, some technical features related to the embodiment of the present invention are explained first.

The centralized node may be a logical entity or an independent device. For example, the core network device may be a core network device such as an independent Gateway (GW), or may be a software or hardware module provided in the core network device such as the GW, or may be a core network node, or may be an Operation, Administration and maintenance (OAM) node, or may be a software or hardware module provided in the OAM node, or may be a base station, or may be a software or hardware module provided in the base station. One centralized node may control multiple base stations.

The base station in the embodiment of the present invention refers to a small station of an omnidirectional antenna, such as a Low Power Node (LPN), e.g., pico, femto, etc.; access Point (AP), and the like.

A cell, if a base station (small station) works on a central frequency point, the base station is divided into a cell, and the working frequency point of the cell is the working frequency point (central frequency point) of the base station. If the base station works on two or more central frequency points, the base station is divided into two or more cells, the number of the cells is the number of the working frequency points of the base station, and the working frequency point of each cell is one working frequency point of the base station.

The supported operating band, i.e. the licensed band, is for example band 42.

The allowed operating frequency band, i.e. the frequency band that can be actually used by the base station, is part or all of the licensed frequency band, depending on the device capabilities and the operator of the base station.

And (3) network preplanning, which can be carried out to facilitate the allocation of the working frequency points and the bandwidth, and the basic rules of the bandwidth of the working frequency band and the distribution of the central frequency points are formulated. The concept of resource management granularity may specifically be introduced. Resource management granularity R_segI.e., minimum bandwidth allocation granularity, is the minimum operating bandwidth of the base station. For example, the selectable operating bandwidths of the base station are 5MHz, 10MHz and 20MHz, then R_segIs 5MHz, the selectable working bandwidth of the base station respectively corresponds to 1R_seg2R_seg4, R_seg。

The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The method for determining the interference of the neighboring cell at the centralized node side provided by the embodiment of the present invention is shown in fig. 1, and specifically includes the following operations:

step 100, the centralized node obtains a first neighbor cell measurement result reported by each base station, wherein the first neighbor cell measurement result is obtained by performing neighbor cell measurement on each measurement frequency point after the base station is started.

And the first adjacent cell measurement result is obtained by firstly measuring the adjacent cells on each measurement frequency point after the base station is started.

After the base station is started, the base station requests to access the network. Correspondingly, the centralized node acquires a first neighbor cell measurement result reported by each base station of the access network.

Step 110, the centralized node determines the neighboring cell interference relationship information of each base station according to the first neighboring cell measurement result reported by each base station, and the neighboring cell interference relationship information records the interfering neighboring cells of the base stations.

Specifically, the centralized node determines, for each accessed base station, the neighboring cell interference relationship information of the base station according to the first neighboring cell measurement result reported by the base station.

After the adjacent cell interference relationship is determined by adopting the technical scheme provided by the embodiment of the invention, the centralized node performs interference coordination and maintenance on each base station according to the determined adjacent cell interference relationship of each base station. Due to the adoption of centralized management, the problem of overweight interface load among all base stations in distributed management is avoided.

If the base station is divided into at least two cells, namely the base station works on at least two central frequency points, the centralized node determines the interference relationship information of the adjacent cells for the cell corresponding to the first adjacent cell measurement result. For example, a base station works on two central frequency points and is divided into a cell 1 (central frequency point 1) and a cell 2 (central frequency point 2), and if the base station only reports a first neighbor cell measurement result obtained by performing neighbor cell measurement on the central frequency point 1 (i.e., the first neighbor cell measurement result of the cell 1), the centralized node determines neighbor cell interference relationship information (i.e., neighbor cell interference relationship information of the cell 1) when the base station works on the central frequency point 1. If the base station reports the first neighbor cell measurement results (namely the first neighbor cell measurement results of the cell 1 and the cell 2) obtained by respectively performing neighbor cell measurement on the central frequency point 1 and the central frequency point 2, the centralized node determines the neighbor cell interference relationship information (namely the neighbor cell interference relationship information of the cell 1) when the base station works on the central frequency point 1 according to the first neighbor cell measurement result of the cell 1, and determines the neighbor cell interference relationship information (namely the neighbor cell interference relationship information of the cell 2) when the base station works on the central frequency point 2 according to the first neighbor cell measurement result of the cell 2. The interference neighbor cell refers to a neighbor cell having co-channel interference with a cell of the base station.

Preferably, the interference relationship information of the neighboring cell is recorded and stored in a table form. The form of the neighbor cell interference relationship table may be various, and the present invention does not limit this. For example, the centralized node may respectively maintain a neighbor cell interference relationship table for each base station based on each frequency point of the allowed operating frequency band. If there are N base stations accessing the node in the set and each base station has a cell, the neighboring cell interference relationship table of each base station on a single frequency point is shown in table 1. If the cell has the CellID, the centralized node may also maintain the neighboring cell interference relationship table for each cell on each frequency point, and the neighboring cell interference relationship table of each cell of the same base station on the same frequency point may be reused. Assuming that there are N base stations of the access node and each base station has a cell, the neighboring cell interference relationship table of each cell on a single frequency point is shown in table 2.

TABLE 1

Wherein, the cell i is a cell of the base station i, i is 1,2, … …, N; 1 indicates that the cell is an interfering neighbor cell, and 0 indicates that the cell is not an interfering neighbor cell.

TABLE 2

Wherein, 1 represents an interference neighboring cell, and 0 represents not an interference neighboring cell.

Based on any of the above embodiments, preferably, the first neighbor cell measurement result includes identification information of a neighbor cell of the base station and/or a measurement value of a measurement quantity.

The identification information of the neighboring cell may be, but is not limited to, a Physical Cell Identity (PCI) of the neighboring cell, an evolved terrestrial radio access network global cell identity (ECGI), and the like.

Wherein the measurement quantity may include, but is not limited to, at least one of the following: reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), and Signal to Interference plus noise Ratio (SINR).

For example, if the centralized node can uniquely determine the cell by using the frequency point and the PCI, the first neighbor cell measurement result includes a measurement value of the PCI and/or the measurement quantity of the neighbor cell of the base station. If the centralized node cannot uniquely determine the cell through the frequency point and the PCI, the measurement result of the first neighboring cell also needs to carry the ECGI.

Based on any of the above embodiments, if the centralized node can know the neighbor information of the base station, for example, know the location information of the newly accessed base station, and know the neighbor information of the location. Then, before the centralized node obtains the first neighbor cell measurement result reported by the base station, the centralized node may also send information of the measurement frequency point and/or the threshold value of the measurement quantity to the base station.

The measurement frequency point is determined based on network preplanning according to the capability of the base station and the allowed working frequency band.

And the threshold value of the measurement quantity is used for the base station to judge whether the adjacent cell is an interference adjacent cell. Specifically, if the measured value of the measured quantity of the neighboring cell is greater than the threshold value of the measured quantity, the neighboring cell is determined to be an interfering neighboring cell, otherwise, the neighboring cell is determined not to be an interfering neighboring cell.

Based on any of the above embodiments, after determining the neighboring cell interference relationship information, if the neighboring cell interference relationship of the base station changes, the centralized node also modifies the neighboring cell interference relationship information of the base station whose neighboring cell interference relationship changes.

The neighboring cell interference relationship of the base station may be changed but is not limited to at least one of the following situations:

the working frequency band of the cell of the base station changes;

the working frequency band of the adjacent area of the base station changes;

starting a neighboring cell of the base station;

and closing the adjacent area of the base station.

The cell operating frequency band transmission change of the base station can be, but is not limited to, the following situations:

the working frequency point of the working frequency band of the cell of the base station is not changed, but the bandwidth is changed (increased or decreased); or,

the working frequency point of the working frequency band of the cell of the base station is changed, and the bandwidth is changed (increased or decreased); or,

the working frequency point of the working frequency band of the cell of the base station is changed, but the bandwidth is unchanged;

cell increase of the base station; or,

the cell of the base station decreases.

The operating frequency point of the base station has a fixed association relation with the cell. Therefore, if the working frequency point of the working frequency band of the cell of the base station is not changed, it means that only the bandwidth of the working frequency band of the cell is changed. The change of the working frequency points of the working frequency band of the cell indicates that the base station closes one cell and opens another cell. The cell increase of the base station means that the base station newly increases a working frequency point. The cell reduction of the base station means that the base station reduces the working frequency points.

When the working frequency band of the cell of the base station needs to be adjusted, the base station can trigger and adjust the cell, under the condition, the base station reports the bandwidth of the working frequency band after the cell is adjusted to the centralized node (if the working frequency point is changed, the changed working frequency point is also reported), and the centralized node learns that the bandwidth of the working frequency band of the cell of the base station is changed; the base station can trigger the centralized node to adjust the cell of the base station, under the condition, the base station requests the centralized node to adjust the working frequency range of the cell, the centralized node adjusts the working frequency range of the cell of the base station according to the request of the base station, and the centralized node learns that the working frequency range of the cell of the base station changes; the centralized node can also trigger and adjust the working frequency band for the cell of the base station, and the centralized node learns that the working frequency band of the cell of the base station changes; the centralized node can also be triggered and adjusted for the cell by the base station, under the condition, the centralized node indicates the base station to adjust the working frequency band for the cell, the base station adjusts the working frequency band for the cell according to the indication of the centralized node, and the centralized node learns that the working frequency band of the cell of the base station changes.

Take the example of a base station triggering and adjustment by a centralized node. Assuming that the base station is divided into a cell, and the bandwidth of the current working frequency band of the cell is 10M, due to the traffic transmission requirement, the base station sends a bandwidth increase request to the centralized node to request the centralized node to allocate 20M bandwidth to the base station. After receiving the request from the base station, the centralized node may allocate bandwidth to the base station in several ways as follows:

in the first mode, the working frequency point of the cell of the base station is not changed, and the bandwidth of the working frequency band is increased for the cell of the base station. Namely, the base station is allocated with 20M bandwidth corresponding to the current working frequency point.

And secondly, changing the working frequency points of the cell of the base station, and reallocating at least one working frequency point for the base station, wherein the sum of the bandwidths corresponding to the distributed working frequency points is 20M. When the base station is adjusted in this way, it is equivalent to turn off the currently operating cell and turn on another cell.

And thirdly, the current working frequency point of the base station is not changed, at least one working frequency point is allocated to the base station, and the sum of the bandwidths corresponding to the allocated working frequency points is 10M. When the base station is adjusted in this way, it is equivalent to not turning off the currently operating cell and starting up at least one other cell.

The base station requests to adjust the bandwidth of the working frequency band of the cell, generally because the base station determines that there is a large traffic demand that cannot be met by the current bandwidth, and needs to increase the bandwidth or increase the cell, or needs to decrease the bandwidth or delete the cell when the current traffic becomes small.

After the working frequency band of the cell of the base station changes, the centralized node can instruct the base station to perform neighbor cell measurement again to obtain a second neighbor cell measurement result in order to obtain complete information for maintaining the neighbor cell interference relationship and consider the load condition of the cell and the like, and the neighbor cell interference relationship information of the base station with the changed working frequency band of the cell is modified according to the second neighbor cell measurement result. Specifically, the centralized node determines that the historical measurement result of the base station with the changed working frequency band of the cell is invalid; and instructing the base station to perform neighbor cell measurement to obtain a second neighbor cell measurement result, and modifying the base station neighbor cell interference relationship information according to the second neighbor cell measurement result reported by the base station. The historical measurement result of the base station refers to the neighbor measurement result of the base station, which is stored by the centralized node before the second neighbor measurement result is obtained.

The method for determining the interference of the neighboring cell at the base station side provided by the embodiment of the present invention is shown in fig. 2, and specifically includes the following operations:

and 200, carrying out neighbor cell measurement on each measurement frequency point after the base station is started.

Step 210, the base station reports a first neighboring cell measurement result obtained by the neighboring cell measurement to the centralized node, so that the centralized node determines the neighboring cell interference relationship information of the base station according to the first neighboring cell measurement result.

For each method embodiment on the base station side based on fig. 2, there are technical features the same as or corresponding to those of the above centralized node side embodiment, and reference may be made to the description of the centralized node side embodiment, which will not be described again.

Preferably, after the base station is started, the information of the measurement frequency points and/or the threshold value of the measurement quantity sent by the centralized node is received; determining each measuring frequency point according to the information of the measuring frequency points, and measuring adjacent regions on each measuring frequency point; and carrying the measured value of the measured quantity which is obtained by the adjacent cell measurement and is larger than the threshold value of the measured quantity in the first adjacent cell measurement result and reporting the first adjacent cell measurement result to the base station.

The method provided by the embodiment of the invention is suitable for any wireless communication system which can cause co-channel interference by multi-base station networking. The following describes the technical solution provided by the embodiment of the present invention in detail, taking the maintenance of the neighboring cell interference relationship of the AP in a dense deployment scenario in the LTE system as an example.

In a dense deployment scenario, there are one or more cells under each AP.

In a dense deployment scenario, the determination method of the initial neighboring cell interference relationship table of the AP is shown in fig. 3, and specifically includes:

step 300, the AP establishes connection with the network, requests to access the network, and reports information such as frequency point, bandwidth capability, multi-cell capability and the like to a centralized node in the network.

And step 310, the centralized node determines an allowed working frequency band of the AP according to the frequency point and the bandwidth capability of the AP, and informs the AP to perform neighbor cell measurement on the allowed working frequency band.

The centralized node determines an allowed working frequency band according to the frequency point and the bandwidth capacity of the AP, and can determine the basic deployment of the AP working frequency point in the allowed working frequency band through network preplanning.

Further, if the AP does not support the multi-cell capability according to the multi-cell capability information, the centralized node only allocates one working frequency point for the AP. And if the AP is determined to support the multi-cell capability, the centralized node allocates at least one working frequency point for the AP.

Wherein the bandwidth of the working frequency band can be R_segThe number of (2) is shown.

The centralized node can inform the AP to perform neighbor cell measurement on the designated frequency point in order to obtain complete information to maintain the neighbor cell interference relationship table and the frequency band priority table. Correspondingly, the centralized node performs measurement configuration for the AP, mainly configuring measurement frequency points, threshold values of measurement quantities (such as RSRP), and the like.

If the centralized node can determine the basic neighboring cell information of the AP, mainly the frequency point information of the neighboring cell of the AP and/or the threshold of the measurement amount, when the AP is notified to perform the neighboring cell measurement on the allowed operating frequency band, the AP is also notified of the basic neighboring cell information.

And step 320, the AP searches and measures the adjacent regions.

Step 330, the AP completes the neighbor cell search and measurement, and reports the measured value of the neighbor cell measurement amount whose measured value is greater than the measurement amount threshold (taking RSRP as an example, the threshold is TH _ RSRP) and the corresponding PCI to the centralized node.

The centralized node can uniquely determine the cell through the frequency point + PCI, and if the assumption is not satisfied, the AP is required to acquire the ECGI and report the ECGI.

And 340, the centralized node establishes a neighbor cell interference relation table for the cell of the AP according to the neighbor cell PCI reported by the AP measurement and the measurement value of the measurement quantity.

Optionally, the centralized node further establishes a neighboring cell interference relationship table for a new cell under the newly accessed AP, in combination with the stored information (cell frequency, bandwidth, load, etc.) of other cells.

For example, the bandwidth and the load are used as weight coefficients to modify the measured value of the measured quantity, and then the measured value is compared with a threshold value to establish a neighbor cell interference relation table.

Correspondingly, the AP reports the cell load. Cell load may be expressed in terms of the PRB utilization of the cell. The PRB utilization rate of a cell is the number of actually used PRBs of the cell/the total number of PRBs in the working bandwidth of the cell. The cell load includes a cell uplink load and a cell downlink load.

Correspondingly, the implementation manner of searching and measuring the neighboring cells after the AP is powered on is shown in fig. 4, and specifically includes:

step 400, the AP selects a candidate frequency point within the allowed operating frequency band to perform neighbor search.

And if the centralized node sends the information of the measurement frequency point, the AP takes the measurement frequency point corresponding to the information as a candidate frequency point.

Otherwise, the AP takes the network deployment frequency point in the allowed working frequency band as a candidate frequency point, and searches the adjacent cells in sequence from the minimum frequency value.

Step 410, the AP determines whether a synchronization signal is detected on the current candidate frequency point, if so, step 420 is executed, otherwise, step 450 is executed.

And step 420, the AP performs cell synchronization and RSRP measurement on the current candidate frequency point.

In step 430, the AP compares the RSRP value within a certain statistical time with a threshold TH _ RSRP.

If the RSRP is greater than TH _ RSRP, the neighboring cell is considered to have interference to the AP cell, step 440 is executed, otherwise, the cell measurement value is discarded, and step 450 is executed.

And step 440, storing the PCI and RSRP of the adjacent regions.

And 450, judging whether the current candidate frequency point is the last candidate frequency point, if so, ending the process, and otherwise, repeating the step 410 on the next frequency point.

In a dense deployment scenario, an implementation manner of updating a neighboring cell interference relationship table of a cell is shown in fig. 5, and specifically includes:

step 500, the cell under the AP has a requirement for adjusting the working frequency band, and the AP sends a request for changing the working frequency band of the cell to the centralized node.

It should be noted that the change of the operating band of a cell may also be triggered by a centralized node.

And step 510, the centralized node adjusts the working frequency band for the cell according to the cell working frequency band adjustment algorithm flow.

The centralized node may perform adjustment of the operating frequency band for the cell in any one of the first to third manners.

For example, if the centralized node determines that the base station does not support the multi-cell capability according to the multi-cell capability reported by the base station in the flow shown in fig. 3, the working frequency band is adjusted for the cell according to the first mode or the second mode. And if the working frequency band is adjusted for the cell according to the second mode, reallocating a working frequency point for the base station. If the base station supports the multi-cell capability, the operating frequency band can be adjusted for the cell according to the first mode, the second mode or the third mode.

Step 520, the centralized node can inform the AP to measure the designated frequency point in order to obtain the complete information to maintain the interference relationship table of the neighboring cell and the frequency band priority table, and considering the cell load condition (for example, there is no UE working currently in the cell).

Step 530, the AP performs neighbor cell measurement on the designated frequency point, and reports the measurement result (such as neighbor cell PCI and RSRP measurement value) to the centralized node.

The implementation manner of performing neighbor cell measurement on the designated frequency point by the AP may refer to the processing flow of fig. 4, which is not described herein again.

And 540, the centralized node updates the neighbor cell interference relation table according to the measurement result.

Optionally, the interference neighbor relation table is updated by combining with stored information of other cells (cell frequency points, bandwidth, load, etc.).

The reason for the change of the neighboring cell interference relationship may be that the neighboring AP is powered on or powered off, and the cell operating frequency band of the local AP or the neighboring AP changes. When the interference relationship of the adjacent cell changes, the AP is not necessarily triggered to perform the adjacent cell measurement, and the AP is triggered to perform the adjacent cell measurement only when the centralized node considers that the current information is not enough to maintain the interference relationship table and the frequency band priority table of the adjacent cell.

The case of not triggering the AP to perform the neighbor cell measurement may include, but is not limited to:

and starting the adjacent AP, accessing the adjacent cell under the AP, calculating the path loss after considering the RSRP value of the adjacent cell to the cell under the AP according to the channel reciprocity, and converting the RSRP value of the cell to the adjacent cell into the cost.

And the adjacent AP is powered off, and the RSRP value of the adjacent cell by the cell is directly deleted.

After the cell working frequency band of the cell under the AP is adjusted, the centralized node considers that the historical information is effective, and directly uses the RSRP value of the adjacent cell of the cell before.

After the cell working frequency band of the cell under the adjacent AP is adjusted, if the adjacent AP carries out adjacent cell measurement, the RSRP value of the cell under the AP to the adjacent cell can be obtained according to reciprocity; and if the adjacent AP does not carry out adjacent cell measurement, the RSRP value of the adjacent cell of the cell is continuously used.

The condition for triggering the AP to perform the neighbor measurement includes:

after the cell working frequency band of the cell under the AP is adjusted, the centralized node considers that the historical information is invalid, and the AP is allowed to carry out neighbor cell measurement to obtain the RSRP (reference signal received power) measurement value of the cell to the neighbor cell.

The neighbor cell measurement process when the neighbor cell interference relationship changes may refer to fig. 5. And when the adjacent cell interference relationship changes, the AP takes the frequency point appointed by the centralized node as a candidate frequency point.

To ensure user experience, the AP may need to perform necessary processing on the UE in the cell, such as switching the UE to a macro cell or other cells; the AP performs gap notification to inform the UE to suspend service within a certain time period. If the AP has two radio frequency units, the adjacent cell measurement can be carried out without terminating the service of the cell, and the UE processing in the cell is not needed.

An embodiment of the present invention further provides a method for determining neighboring cell interference, as shown in fig. 6, including:

and step 600, after the base station is started, performing neighbor cell measurement on each measurement frequency point.

Step 610, the base station determines neighboring cell interference relationship information of the base station according to a first neighboring cell measurement result obtained by neighboring cell measurement, wherein the neighboring cell interference relationship information records an interference neighboring cell of the base station.

For each method embodiment on the base station side based on fig. 6, there are technical features the same as or corresponding to those of the centralized node side embodiment and the base station side embodiment, and reference may be made to the description of each embodiment described above, which will not be described again.

Preferably, when the neighboring cell interference relationship changes, the base station further modifies the neighboring cell interference relationship information.

Preferably, the neighboring cell interference relationship changes, including:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

The operating frequency band of the cell of the base station changes, but may not be limited to the following cases:

cell increase of the base station; or,

the cell of the base station decreases.

the base station determines that the historical measurement result is invalid;

Based on the same inventive concept as the method, an embodiment of the present invention further provides a centralized node, as shown in fig. 7, including:

a measurement result obtaining module 710, configured to obtain a first neighboring cell measurement result reported by each base station, where the first neighboring cell measurement result is obtained by performing neighboring cell measurement after the base station is powered on;

and the neighboring cell interference relationship recording module 720 is configured to determine neighboring cell interference relationship information of each base station according to the first neighboring cell measurement result reported by each base station, where the neighboring cell interference relationship information records an interfering neighboring cell of the base station.

Preferably, the measurement quantity comprises at least one of:

RSRP，RSRQ，SINR。

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

cell increase of the base station; or,

the cell of the base station decreases.

Based on the same inventive concept as the method, an embodiment of the present invention provides a centralized node, as shown in fig. 8, a centralized node 800 at least includes:

a processor 801, the processor 801 being configured to execute a computer program having the following functions: acquiring a first adjacent cell measurement result reported by each base station, wherein the first adjacent cell measurement result is obtained by performing adjacent cell measurement after the base station is started; respectively determining adjacent cell interference relationship information of each base station according to a first adjacent cell measurement result reported by each base station, wherein the adjacent cell interference relationship information records an interference adjacent cell of the base station;

a memory 802, the memory 802 configured to hold code of the computer program.

The working principle of the centralized node 800 may refer to the description of the above method embodiment, and repeated descriptions are omitted.

Preferably, the processor 801 is further configured to execute a computer program having the following functions: and before the first neighbor cell measurement result reported by the base station is obtained, sending the information of the measurement frequency point and/or the threshold value of the measurement quantity to the base station.

Preferably, the processor 801 is further configured to execute a computer program having the following functions: and modifying the adjacent cell interference relationship information of the base station with the changed adjacent cell interference relationship.

Preferably, the processor 801 is further configured to execute a computer program having the following functions: determining that the historical measurement result of the base station with the changed working frequency band of the cell is invalid; and indicating the base station to carry out neighbor cell measurement to obtain a second neighbor cell measurement result, and modifying the neighbor cell interference relationship information of the base station according to the second neighbor cell measurement result reported by the base station.

Accordingly, the memory 802 is configured to hold codes of respective computer programs executed by the processor 801.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a base station, as shown in fig. 9, including:

a neighbor cell measurement module 910, configured to perform neighbor cell measurement on each measurement frequency point after the base station is powered on;

a measurement result reporting module 920, configured to report a first neighboring cell measurement result obtained by neighboring cell measurement to a centralized node, so that the centralized node determines, according to the first neighboring cell measurement result, neighboring cell interference relationship information of the base station, where the neighboring cell interference relationship information records an interfering neighboring cell of the base station.

Preferably, the measurement quantity comprises at least one of:

RSRP，RSRQ，SINR。

preferably, the base station further comprises a measurement information receiving module, configured to receive, after the base station is powered on, information of the measurement frequency point and/or a threshold value of the measurement quantity sent by the centralized node;

Based on the same inventive concept as the method, an embodiment of the present invention further provides a base station, as shown in fig. 10, including at least:

a processor 1001, the processor 1001 being configured to execute a computer program having the following functions: after the base station is started, performing neighbor cell measurement on each measurement frequency point; reporting a first neighbor cell measurement result obtained by neighbor cell measurement to a centralized node so that the centralized node determines neighbor cell interference relationship information of the base station according to the first neighbor cell measurement result, wherein the neighbor cell interference relationship information records interference neighbor cells of the base station;

a memory 1002, the memory 1002 being configured to hold code of the computer program as described above.

The operation principle of the base station may refer to the description of the above method embodiments, and repeated descriptions are omitted.

Preferably, the processor 1001 is further configured to execute a computer program having the following functions: after the base station is started, receiving information of the measurement frequency points and/or threshold values of the measurement quantity sent by the centralized node; determining each measuring frequency point according to the information of the measuring frequency points, and measuring adjacent regions on each measuring frequency point; and carrying the measured value of the measured quantity which is obtained by the adjacent cell measurement and is larger than the threshold value of the measured quantity in the first adjacent cell measurement result and reporting the first adjacent cell measurement result to the centralized node.

Accordingly, the memory 1002 is configured to hold codes of respective computer programs executed by the processor 1001.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a base station, as shown in fig. 11, including:

a neighbor cell measurement module 1110, configured to perform neighbor cell measurement after the base station is powered on;

the neighboring cell interference relationship recording module 1120 is configured to determine, according to a first neighboring cell measurement result obtained by neighboring cell measurement, neighboring cell interference relationship information of the base station, where the neighboring cell interference relationship information records an interfering neighboring cell of the base station.

Preferably, the measurement quantity comprises at least one of:

RSRP，RSRQ，SINR。

based on any of the foregoing embodiments of the base station, preferably, the neighboring cell interference relationship recording module is further configured to:

Preferably, the neighboring cell interference relationship changes, including:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

cell increase of the base station; or,

the cell of the base station decreases.

determining that the historical measurement is invalid;

a processor 1001, the processor 1001 being configured to execute a computer program having the following functions: carrying out neighbor cell measurement after the base station is started; determining neighbor cell interference relationship information of the base station according to a first neighbor cell measurement result obtained by neighbor cell measurement, wherein the neighbor cell interference relationship information records an interference neighbor cell of the base station;

Preferably, the processor 1001 is further configured to execute a computer program having the following functions: and when the adjacent cell interference relationship changes, modifying the adjacent cell interference relationship information.

Preferably, the processor 1001 is further configured to execute a computer program having the following functions: determining that the historical measurement is invalid; and performing neighbor cell measurement to obtain a second neighbor cell measurement result, and modifying neighbor cell interference relationship information according to the second neighbor cell measurement result.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for determining neighbor cell interference is characterized by comprising the following steps:

2. The method of claim 1, wherein the first neighbor cell measurement result comprises identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of a measurement quantity.

3. The method according to claim 1 or 2, wherein before the centralized node obtains the first neighbor cell measurement result reported by the base station, the method further comprises:

4. The method according to claim 1 or 2, characterized in that the method further comprises:

5. The method of claim 4, wherein the neighbor interference relationship of the base station changes, comprising:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

6. The method of claim 5, wherein the operating frequency band of the cell of the base station changes, comprising:

cell increase of the base station; or,

the cell of the base station decreases.

7. The method of claim 5, wherein the step of modifying, by the centralized node, the neighboring cell interference relationship information of the base station with the changed working frequency band of the cell comprises:

8. A method for determining neighbor cell interference is characterized by comprising the following steps:

9. The method of claim 8, wherein the first neighbor cell measurement result comprises identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of the measurement quantity.

10. The method according to claim 8 or 9, wherein before the base station performs neighbor cell measurement on each measurement frequency point after powering on, further comprising:

11. A method for determining neighbor cell interference is characterized by comprising the following steps:

12. The method of claim 11, wherein the first neighbor cell measurement result includes identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of the measurement quantity.

13. The method of claim 11 or 12, further comprising:

14. The method of claim 13, wherein the neighbor cell interference relationship changes, comprising:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

15. The method of claim 14, wherein the operating frequency band of the cell of the base station changes, comprising:

cell increase of the base station; or,

the cell of the base station decreases.

16. The method of claim 14, wherein the base station modifies the neighbor cell interference relationship information, comprising:

the base station determines that the historical measurement result is invalid;

17. A centralized node, comprising:

18. The concentration node of claim 17, wherein the first neighbor cell measurement result includes identification information of neighbor cells of the base station on each measurement frequency point and a measurement value of the measurement quantity.

19. The concentration node according to claim 17 or 18, further comprising:

20. The concentration node according to claim 17 or 18, wherein the neighbor cell interference relationship recording module is further configured to:

21. The concentration node of claim 20, wherein the neighbor interference relationship of the base station changes, comprising:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

22. The concentration node of claim 21, wherein the change in the operating frequency band of the cell of the base station comprises:

cell increase of the base station; or,

the cell of the base station decreases.

23. The concentration node according to claim 21, wherein when modifying the neighboring cell interference relationship information of the base station whose operating frequency band of the cell changes, the neighboring cell interference relationship recording module is configured to:

24. A base station, comprising:

25. The base station of claim 24, wherein the first neighbor cell measurement result includes identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of the measurement quantity.

26. The base station according to claim 24 or 25, further comprising a measurement information receiving module, configured to receive, after the base station is powered on, information of measurement frequency points and/or a threshold value of measurement quantity sent by the centralized node;

27. A base station, comprising:

28. The base station of claim 27, wherein the first neighbor cell measurement result includes identification information of a neighbor cell of the base station on each measurement frequency point and a measurement value of the measurement quantity.

29. The base station of claim 27 or 28, wherein the neighbor cell interference relation recording module is further configured to:

30. The base station of claim 29, wherein the neighbor cell interference relationship changes, comprising:

the working frequency band of the cell of the base station changes; or,

starting a neighboring cell of the base station; or,

and closing the adjacent area of the base station.

31. The base station of claim 30, wherein the operating frequency band of the cell of the base station changes, comprising:

cell increase of the base station; or,

the cell of the base station decreases.

32. The base station of claim 30, wherein when modifying the neighbor cell interference relationship information, the neighbor cell interference relationship recording module is configured to:

determining that the historical measurement is invalid;