CN106332098B - Method and device for distributing physical cell identification - Google Patents
Method and device for distributing physical cell identification Download PDFInfo
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- CN106332098B CN106332098B CN201510386786.XA CN201510386786A CN106332098B CN 106332098 B CN106332098 B CN 106332098B CN 201510386786 A CN201510386786 A CN 201510386786A CN 106332098 B CN106332098 B CN 106332098B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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Abstract
The invention discloses a method for distributing Physical Cell Identity (PCI), which comprises the following steps: receiving neighbor cell information sent by a small base station; distributing the PCI for the small base station by using the neighbor cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; and the macro base station is the macro base station in the neighbor cell information. The invention also discloses a device for distributing the PCI.
Description
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a method and an apparatus for allocating Physical Cell Identifiers (PCIs).
Background
a Small Cell, a Picocell or a Nanocell (Long Term Evolution) base station is a miniaturized LTE base station, has the characteristics of Small volume, low transmitting power and easiness in deployment and installation, and is suitable for families, venues, buildings and other areas to achieve the purposes of hot spot supplement, coverage blind area supplement and accurate coverage.
the LTE small base station must configure the PCI in deployment. The PCI is a key parameter for the operation of the physical layer of the LTE base station, directly determines a cell synchronization sequence and influences scrambling modes of a plurality of physical channels.
the existing PCI distribution method of the LTE base station mainly comprises the following steps: manual allocation, centralized automatic allocation based on graph theory, allocation based on base station interception, allocation based on terminal measurement and reporting and the like. However, when the allocation methods are applied to the LTE small cell, due to the characteristics of the LTE small cell, the allocation methods often have the PCI conflict problem, which causes at least one of the problems of difficulty in network deployment, difficulty in obtaining network topology, complex handover process, and great difficulty in operation and cost.
Disclosure of Invention
in order to solve the existing technical problem, embodiments of the present invention provide a method and an apparatus for allocating a PCI.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a method for distributing PCI, which comprises the following steps:
receiving neighbor cell information sent by a small base station;
distributing the PCI for the small base station by using the neighbor cell information; wherein the content of the first and second substances,
The PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; and the macro base station is the macro base station in the neighbor cell information.
In the above solution, the PCI allocated to the small cell does not conflict with the PCI of the small cell in the neighbor cell information, and the PCI allocated to the small cell is:
the PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
In the above solution, the PCI allocated to the small cell does not conflict with the PCI of a specific neighboring small cell, and the PCI allocated to the small cell is:
the PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
In the foregoing solution, before the allocating the PCI to the small cell by using the neighboring cell information, the method further includes:
determining a macro base station neighbor cell in the neighbor cell information;
Correspondingly, when the PCI is allocated to the small cell, the method further includes:
and obtaining the PCI of other adjacent small base stations except the small base station of each macro base station adjacent Cell by utilizing the evolution-universal mobile telecommunications system terrestrial radio access network Cell Global Identifier (ECGI, E-UTRAN Cell Global Identifier) and the PCI of the adjacent base station in the received adjacent Cell information of all the small base stations.
In the foregoing solution, the determining the macro base station neighboring cell in the neighboring cell information includes:
Determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
Determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
And determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
The embodiment of the invention also provides a device for distributing the PCI, which comprises: a receiving unit and a distributing unit; wherein the content of the first and second substances,
The receiving unit is used for receiving the neighboring cell information sent by the small base station;
the distribution unit is configured to distribute the PCI to the small cell by using the neighboring cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information, and does not conflict with the PCI of a specific adjacent small base station, wherein the specific adjacent small base station is other adjacent small base stations except the small base station in the neighbor cell of the macro base station; and the macro base station is the macro base station in the neighbor cell information.
In the above solution, the PCI allocated to the small cell does not conflict with the PCI of the small cell in the neighbor cell information, and the PCI allocated to the small cell is:
The PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
in the above solution, the PCI allocated to the small cell does not conflict with the PCI of a specific neighboring small cell, and the PCI allocated to the small cell is:
the PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
in the foregoing solution, the apparatus further includes a determining unit, configured to determine a macro base station neighboring cell in the neighboring cell information;
Correspondingly, the allocating unit is further configured to, when allocating the PCI to the small cell, obtain the PCIs of the other neighboring small cells except the small cell of each macro base station neighboring cell by using the ECGI and the PCI of the neighboring cell base station in the received neighboring cell information of all the small cells.
In the foregoing solution, the determining unit is specifically configured to:
Determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
Determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
and determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
the method and the device for distributing the PCI provided by the embodiment of the invention receive the neighbor cell information sent by the small base station; distributing the PCI for the small base station by using the neighbor cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of the specific adjacent small base station, and the specific adjacent small base station is other adjacent small base stations except the small base station in the neighbor cell of the macro base station; the macro base station is the macro base station in the neighbor cell information, so that the distribution of the PCI of the small base station can be automatically realized, and the problem of PCI conflict can be effectively avoided.
Drawings
in the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a schematic diagram of a typical networking scenario of a macro base station and an LTE small base station;
FIG. 2 is a flowchart illustrating a method for allocating PCI according to an embodiment of the present invention;
Fig. 3 is a flowchart illustrating a process of allocating a PCI to a small cell according to a second embodiment of the present invention;
Fig. 4 is a schematic view of a topological structure of a macro base station system and a small base station system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a device for distributing PCI according to a third embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another PCI allocation apparatus according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Before describing the embodiment of the present invention, a detailed understanding of the existing distribution method of the PCI of the LTE base station is given, and at present, there are four distribution methods as follows:
1. manual allocation mode: and the network planning optimization personnel manually sets the PCI of each base station, and avoids the problems of PCI conflict and the like in the setting process.
2. centralized automatic distribution mode based on graph theory: on the premise of obtaining a network topology relation, particularly a neighborhood relation in advance, PCI is automatically allocated to each cell through a dyeing algorithm or other algorithms based on graph theory.
3. the allocation mode based on the base station interception is as follows: and the base station monitors the PCIs of the surrounding neighbors and then selects a proper PCI by using a distributed algorithm according to the PCI distribution rule.
4. The allocation mode based on terminal measurement and reporting: and the base station reports and discovers the PCI used by the adjacent cell through the measurement of the terminal. If the PCI of the user and the PCI of other adjacent cells are the same, other PCIs can be selected by the user or reported to a network management server to solve the conflict problem. And if the base station finds that more than two adjacent regions use the mutually conflicting PCIs, the base station indicates the terminal to report the unique identifier ECGI of the adjacent regions. The base station reports the PCI and ECGI of the conflict neighbor cell to the network management server, and the network management server solves the PCI conflict problem.
when the distribution modes are applied to the LTE small base station, that is, when the distribution modes are adopted to distribute the PCIs for the LTE small base station, due to the characteristics of the LTE small base station, the distribution modes often have the problem of PCI conflict, so that at least one of the problems that the network deployment is difficult, the network topology is difficult to obtain, the switching process is complex, and the operation and cost difficulty is large is caused. Specifically, the method comprises the following steps:
1. the disadvantages of the manual distribution mode are as follows: the coverage area of the LTE small base station is small, so a large number of LTE small base stations can be deployed in the network, and thus the difficulty of network deployment can be greatly increased by manually allocating PCIs. In addition, the home LTE small base station is deployed by the user and cannot use manual PCI allocation.
2. the centralized distribution mode based on the graph theory has the following disadvantages: the distribution formula needs to obtain a network topology structure, however, the coverage area of the small base stations is small, the number of the small base stations is large, and the deployment mode is flexible, so that the network topology structure is difficult to obtain.
3. Base station interception mode based allocation: because the LTE small base stations are mainly used for blind or hot patching and form continuous coverage together with the macro station, the LTE small base stations cannot often listen to each other. If two LTE small base stations serving as macro-station neighbors select the same PCI, a problem of complex handover occurs. For example, fig. 1 shows a typical macro base station and LTE small base station networking scenario, as shown in fig. 1, LTE small base stations B and C are usually deployed around a macro base station a as supplementary blindness or supplementary heating. If the PCI allocation based on sensing is adopted, the LTE small base stations B and C cannot hear each other because they are far apart, and thus the same PCI may be allocated. If the LTE small base stations B and C are allocated with the same PCI, PCI confusion occurs in the adjacent cell of the macro base station A, so that the macro base station A cannot retrieve the unique adjacent cell by using the PCI, and the LTE small base station A is required to indicate the terminal to further measure the ECGI of the given PCI adjacent cell, so that the adjacent cell is selected according to the ECGI. This complicates the handover process and causes a long handover delay, which may cause a handover call drop and affect the network performance.
4. Distribution based on terminal measurement and reporting modes: in the scenario shown in fig. 1, the terminal reports both the PCIs and ECGIs of the LTE small base stations B and C to the macro base station a. If the PCI of the LTE small base stations B and C conflict, under an ideal condition, the macro base station A can find the problem, report the problem to a network management system to solve the PCI conflict, and reallocate the PCI for the LTE small base stations B and C. However, the disadvantage of this solution is that the macro base station and the small base station are usually devices of different manufacturers and belong to different network management systems, so when the macro base station a finds a PCI conflict, it cannot notify the network management system of the small base station. Therefore, the problem of PCI conflict cannot be solved. If the macro base station network management system is modified so as to be capable of communicating with the small base station network management system, the cost and the operation difficulty are high.
based on this, in various embodiments of the invention: receiving neighbor cell information sent by a small base station; distributing the PCI for the small base station by using the neighbor cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; and the macro base station is the macro base station in the neighbor cell information.
Example one
The method for distributing PCI in this embodiment, as shown in fig. 2, includes the following steps:
step 201: receiving neighbor cell information sent by a small base station;
Here, the small cell may be an LTE small cell, or the like.
The neighbor cell information may include: frequency point information, PCI and ECGI of the neighboring base station.
the cell base station can obtain the frequency point information and the PCI through a cell synchronization channel; for ECGI, the small cell may acquire via cell broadcast message.
step 202: and distributing the PCI for the small base station by using the adjacent cell information.
the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; and the macro base station is the macro base station in the neighbor cell information.
Here, since PCIs of adjacent LTE small base stations must be different from each other, handover failure may be caused. The PCI of LTE small base stations interfering with each other must be staggered by a mode 3, otherwise, pilot signals can interfere with each other, and data service is influenced.
Based on this, the PCI allocated to the small cell does not conflict with the PCI of the small cell in the neighbor cell information, which specifically includes:
the PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
The PCI allocated to the small cell does not conflict with the PCI of a specific neighboring small cell, and specifically includes:
The PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
in an embodiment, before the allocating the PCI to the small cell by using the neighboring cell information, the method may further include:
determining a macro base station neighbor cell in the neighbor cell information;
correspondingly, when the PCI is allocated to the small cell, the method may further include:
and obtaining the PCI of other adjacent small base stations except the small base station of each macro base station adjacent cell by utilizing the ECGI and the PCI of the terrestrial radio access network cell of the evolved universal mobile telecommunications system of the adjacent cell base station in the received adjacent cell information of all the small base stations.
The determining the macro base station neighboring cell in the neighboring cell information specifically includes:
determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
Determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
And determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
Here, in practical application, since the small base station and the macro base station are deployed using different frequencies, that is, the small base station and the macro base station use different frequency points, the macro base station neighbor cell in the neighbor cell information can be determined by using the frequency point information. At this time, the frequency points used by the macro base station may be stored in advance in the network management device of the small base station system, so that the network management device of the small base station system may determine the macro base station neighboring cell in the neighboring cell information by using the frequency point information.
in practical application, compared with a small base station, the number of macro base stations is small, so in order to ensure the switching performance, the macro base station neighbor cell is generally configured for the small base station manually, and therefore the macro base station neighbor cell in the neighbor cell information can be determined by using the configured neighbor cell relation.
In practical application, different ECGI ranges can be divided for the macro base station and the small base station, so that the macro base station neighbor cell in the neighbor cell information can be determined according to the range to which the ECGI of each neighbor cell base station in the neighbor cell information belongs.
in practical application, the steps 201 to 202 are executed by the network management device of the small cell system, and the small cell system automatically allocates the PCI, so that the normal operation of the macro cell system is not affected.
the method for distributing the PCI provided by the embodiment of the invention receives the neighbor cell information sent by the small base station; distributing the PCI for the small base station by using the neighbor cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station, wherein the specific adjacent small base station is other adjacent small base stations except the small base station in the neighbor cell of the macro base station; the macro base station is the macro base station in the neighbor cell information, so that the distribution of the PCI of the small base station can be automatically realized, and the problem of PCI conflict can be effectively avoided.
Example two
In this embodiment, a procedure of allocating a PCI to a small cell is described in detail based on the first embodiment. As shown in fig. 3, the process includes the steps of:
step 301: after the small base station is started, an air interface interception module of the small base station searches all surrounding cells to obtain adjacent cell information;
here, the neighbor information includes: frequency point, PCI and ECGI of the base station in the adjacent area. The method comprises the following steps that a small base station obtains a frequency point and a PCI of a neighboring base station through a cell synchronous channel; and acquiring the ECGI of the adjacent base station through the cell broadcast message.
Step 302: the small base station sends a PCI allocation request to network management equipment of a small base station system;
Here, the PCI request carries neighbor information obtained by the small base station.
In practical application, the neighbor cell information carried in the PCI request may be represented in a form of a list, where the list may be referred to as a list L of surrounding cells (neighbor cell base stations) searched by the cell base station, and the list L includes frequency point, PCI, and ECGI information of the surrounding cells.
In practical application, as shown in fig. 4, the small base stations B and C are usually deployed around the macro base station a as blind or hot compensation, and at this time, both the small base stations B and C report the neighboring cell information acquired by themselves, and the macro base station a is the neighboring cell base station of both the small base stations B and C, so both the small base stations B and C report the frequency point, PCI, and ECGI information of the macro base station a to the network management device (small station network management) of the small base station system. Meanwhile, the small base stations B and C are far away from each other, so that the small base stations B and C cannot intercept each other, and therefore frequency point, PCI and ECGI information of each other cannot be reported.
Step 303: after receiving the PCI allocation request, the network management equipment of the small base station system determines which adjacent cells in the list L are macro base station adjacent cells;
here, it may be determined which neighboring cells in the list L are neighboring cells of the macro base station by using the frequency point information in the list L, the ECGI, or a preset (pre-configured) neighboring cell relationship. Specifically, the method comprises the following steps:
1. For the method of judging by using the frequency point information, since the small base station and the macro base station adopt the pilot frequency deployment, that is, the small base station and the macro base station use different frequency points, which neighbor cells in the list L are the macro base station neighbor cells can be judged by using the frequency point information. At this time, the frequency points used by the macro base station may be stored in advance in the network management device of the small base station system, so that the network management device of the small base station system can determine which neighboring cells in the list L are the macro base station neighboring cells by using the frequency point information.
2. For the judgment mode using the ECGI, different ECGI ranges can be divided for the macro base station and the small base station, so that the network management device of the small base station system can judge which adjacent cells in the list L are the macro base station adjacent cells according to the range to which the ECGI of each adjacent cell base station in the list L belongs.
3. For the manner of determining by using the preset neighbor relation, since the number of macro base stations is smaller than that of the small base station, in order to ensure the handover performance, the macro base station neighbor is generally configured for the small base station manually, and therefore, the network management device of the small base station system can determine which neighbor cells in the list L are the macro base station neighbor cells by using the preset neighbor relation. Specifically, the neighboring base station in the list L that matches the neighboring relationship is the macro base station neighboring cell.
And the other neighbor cells except the macro base station neighbor cell in the list L are the small base station neighbor cells.
Step 304: and the network management equipment of the small base station system distributes the PCI for the small base station by utilizing the neighbor cell information and combining the determined macro base station neighbor cell.
specifically, in the allocation process, step 1: the network management equipment of the small base station system firstly allocates a PCI to the small base station, and the PCI is required to avoid the conflict with the PCI of the adjacent cell of the small base station in the list L, namely the PCI can not be repeated and the modulo 3 conflict is avoided as much as possible. In other words, the PCI allocated to the small cell is different from the PCI of the neighboring cell of the small cell in the list L and is different from the P modulo 3 PCI of the neighboring cell of the small cell in the list L.
Step 2: and inquiring the adjacent cell information reported by all the small base stations in the small base station system for the ECGI of each macro base station adjacent cell in the list L, and retrieving a small base station adjacent cell ECGI list N of the ECGI of the macro base station, wherein the list N comprises the ECGI, the frequency point and the PCI information of surrounding cells. If the PCIs of the other small base station adjacent cells in the list N conflict with the PCIs distributed in the step 1, namely when the PCIs are the same (repeated), the PCIs of the small base station are adjusted to avoid the conflicts with the PCIs of the small base station adjacent cells in the list L and avoid the conflicts with the PCIs of the other small base station adjacent cells in the list N.
For example, as shown in fig. 4, the network management device of the small cell discovers the macro cell a from the reported neighbor cell information (base station neighbor cell list) of the small cells B and C, and retrieves that the ECGI, frequency point and PCI information of the small cells B and C are included in the ECGI list N of the small cell of the macro cell a. At this time, when the PCIs are allocated to the small base stations B and C, it is necessary to avoid allocating duplicate PCIs to the small base stations B and C.
As can be seen from the above description, in the PCI allocation scheme provided in the embodiment of the present invention, the PCI allocation of the small cell is performed by the small cell system itself. Specifically, the small base station not only listens to the PCIs of the surrounding base stations (including the macro base station), but also listens to the ECGIs of the surrounding base stations (including the macro base station); the PCI and ECGI of the adjacent cell are reported to the network management equipment of the small cell system by the small cell, and the PCI is uniformly distributed to the small cell by the network management equipment of the small cell system according to the information.
The PCI allocation scheme provided by the embodiment of the invention is a method for automatically allocating the PCI by a small base station system, does not influence the normal operation of a macro base station system (including a macro station network manager), and can effectively solve the problem of PCI conflict.
EXAMPLE III
To implement the method according to the embodiment of the present invention, the embodiment provides an apparatus for allocating PCI, as shown in fig. 5, the apparatus includes: a receiving unit 51 and a distributing unit 52; wherein the content of the first and second substances,
the receiving unit 51 is configured to receive neighboring cell information sent by a small cell;
The allocating unit 52 is configured to allocate the PCI to the small cell by using the neighboring cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; and the macro base station is the macro base station in the neighbor cell information.
Here, the small cell may be an LTE small cell, or the like.
The neighbor cell information may include: frequency point information, PCI and ECGI of the neighboring base station.
the cell base station can obtain the frequency point information and the PCI through a cell synchronization channel; for ECGI, the small cell may acquire via cell broadcast message.
Since the PCIs of the adjacent LTE small base stations must be different from each other, otherwise a handover failure may result. The PCI of LTE small base stations interfering with each other must be staggered by a mode 3, otherwise, pilot signals can interfere with each other, and data service is influenced.
based on this, the PCI allocated to the small cell does not conflict with the PCI of the small cell in the neighbor cell information, which specifically includes:
The PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
The PCI allocated to the small cell does not conflict with the PCI of a specific neighboring small cell, and specifically includes:
the PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
in one embodiment, as shown in fig. 6, the apparatus may further include: a determining unit 53, configured to determine a macro base station neighboring cell in the neighboring cell information;
Correspondingly, the allocating unit 52 is further configured to, when allocating the PCIs to the small cell, obtain the PCIs of other neighboring small cells except the small cell of each macro base station neighboring cell by using the global identifiers ECGI and PCI of the neighboring cell base stations in the received information of the neighboring cells of all the small cells.
Wherein, the determining unit 53 is specifically configured to:
Determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
Determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
and determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
in practical application, the device is positioned in network management equipment of the small base station system, and the distribution of the PCI is automatically realized by the small base station system, so that the normal operation of the macro base station system is not influenced.
Here, in practical application, since the small base station and the macro base station are deployed using different frequencies, that is, the small base station and the macro base station use different frequency points, the determining unit 53 may determine the macro base station neighboring cell in the neighboring cell information by using the frequency point information. At this time, the frequency point used by the macro base station may be stored in advance in the network management device of the small base station system, so that the determining unit 53 may determine the macro base station neighboring cell in the neighboring cell information by using the frequency point information.
in practical application, the number of macro base stations is smaller than that of small base stations, so to ensure handover performance, the macro base station neighboring cell is generally configured for the small base station manually, and therefore the determining unit 53 may determine the macro base station neighboring cell in the neighboring cell information by using the configured neighboring cell relationship.
In practical application, different ECGI ranges may be divided for the macro base station and the small base station, so that the determining unit 53 may determine the macro base station neighboring cell in the neighboring cell information according to the range to which the ECGI of each neighboring cell base station in the neighboring cell information belongs.
in practical applications, the receiving Unit 51 may be implemented by a receiver in a device for distributing PCI, and the distributing Unit 52 may be implemented by a Central Processing Unit (CPU), a Microprocessor (MCU), a Digital Signal Processor (DSP), or a Programmable logic Array (FPGA) in the device for distributing PCI in combination with a transceiver; the determination unit 53 may be implemented by a CPU, MCU, DSP or FPGA in the PCI device.
In the apparatus for allocating PCI provided in the embodiment of the present invention, the receiving unit 51 receives neighboring cell information sent by a small cell; the allocating unit 52 allocates the PCI to the small cell by using the neighboring cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station, wherein the specific adjacent small base station is other adjacent small base stations except the small base station in the neighbor cell of the macro base station; the macro base station is the macro base station in the neighbor cell information, so that the distribution of the PCI of the small base station can be automatically realized, and the problem of PCI conflict can be effectively avoided.
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 a hardware embodiment, a 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, 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.
the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (8)
1. A method of allocating a physical cell identity, PCI, the method comprising:
Receiving neighbor cell information sent by a small base station;
Distributing the PCI for the small base station by using the neighbor cell information; wherein the content of the first and second substances,
the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; the macro base station is the macro base station in the neighbor cell information;
before the allocating the PCI to the small cell by using the neighbor cell information, the method further includes:
determining a macro base station neighbor cell in the neighbor cell information;
Correspondingly, when the PCI is allocated to the small cell, the method further includes:
And obtaining the PCI of other adjacent small base stations except the small base station of each macro base station adjacent cell by utilizing the ECGI and the PCI of the terrestrial radio access network cell of the evolved universal mobile telecommunications system of the adjacent cell base station in the received adjacent cell information of all the small base stations.
2. The method of claim 1, wherein the PCI allocated to the small cell does not conflict with the PCI of the small cell in the neighbor cell information, and the PCI allocated to the small cell is:
The PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
3. The method of claim 1, wherein the PCI allocated for the small cell does not conflict with the PCI of a specific neighboring small cell, and is:
The PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
4. The method of claim 1, wherein the determining the macro base station neighbor cell in the neighbor cell information comprises:
determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
And determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
5. An apparatus for allocating PCI, the apparatus comprising: a receiving unit and a distributing unit; wherein the content of the first and second substances,
the receiving unit is used for receiving the neighboring cell information sent by the small base station;
The distribution unit is configured to distribute the PCI to the small cell by using the neighboring cell information; the PCI distributed for the small base station does not conflict with the PCI of the small base station in the neighbor cell information and does not conflict with the PCI of a specific adjacent small base station; the specific adjacent small base station is other adjacent small base stations except the small base station in the adjacent area of the macro base station; the macro base station is the macro base station in the neighbor cell information;
The device also comprises a determining unit used for determining the macro base station neighbor cell in the neighbor cell information;
correspondingly, the allocating unit is further configured to, when allocating the PCI to the small cell, obtain the PCIs of the other neighboring small cells except the small cell of each macro base station neighboring cell by using the ECGI and the PCI of the neighboring cell base station in the received neighboring cell information of all the small cells.
6. the apparatus of claim 5, wherein the PCI allocated for the small cell does not conflict with the PCI of the small cell in the neighbor cell information, and is:
the PCI allocated to the small base station is different from the PCI of the small base station in the neighbor cell information and is different from the modulo-3 PCI of the small base station in the neighbor cell information.
7. The apparatus of claim 5, wherein the allocated PCI for the small cell does not conflict with the PCI of a specific neighboring small cell, and wherein the allocated PCI is:
The PCI allocated to the small base station is different from the PCIs of the other adjacent small base stations.
8. The apparatus according to claim 5, wherein the determining unit is specifically configured to:
Determining a macro base station neighbor cell in the neighbor cell information by using the frequency point information of each neighbor cell base station in the neighbor cell information; alternatively, the first and second electrodes may be,
determining a macro base station neighbor cell in the neighbor cell information by using the configured neighbor cell relation; alternatively, the first and second electrodes may be,
and determining the macro base station neighbor cell in the neighbor cell information by using the ECGI of each neighbor cell base station in the neighbor cell information.
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