CN116033446A

CN116033446A - PCI distribution method, base station, electronic device and computer readable storage medium

Info

Publication number: CN116033446A
Application number: CN202111248472.5A
Authority: CN
Inventors: 唐琳; 柯雅珠
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2023-04-28
Also published as: WO2023072074A1

Abstract

The embodiment of the invention relates to the technical field of communication, in particular to a PCI distribution method, a base station, electronic equipment and a computer readable storage medium. The PCI distribution method comprises the following steps: acquiring a physical layer cell identifier PCI of a neighboring cell which is the same as a serving cell frequency point; and generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and distributing the PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell. The embodiment of the invention can accurately avoid the occurrence of PCI conflict or confusion.

Description

PCI distribution method, base station, electronic device and computer readable storage medium

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a PCI distribution method, a base station, electronic equipment and a computer readable storage medium.

Background

The physical layer cell identity (Physical Cell Identifier, abbreviated as "PCI") is a physical layer identity used to uniquely identify one cell in a long term evolution (Long Term Evolution, abbreviated as "LTE") and New Radio access technology (NR ") network, and terminals in LTE and NR use the PCI to distinguish Radio signals of different cells. Since the number of PCIs available in the LTE system and the NR is limited, in the case where the number of cells of the same-frequency networking is large, PCI multiplexing inevitably occurs, that is, the case where a plurality of cells use the same PCI. PCI multiplexing of neighboring cells may cause PCI collisions or PCI confusion, affecting normal communications.

Under the condition that the initial PCI of the service cell and the adjacent cell generate PCI conflict or PCI confusion, the network manager can redistribute a PCI which does not conflict or confusion with the network manager cell for the service cell based on the working parameters such as the frequency point, the PCI and the like of the cell under the network manager so as to ensure the normal operation of communication.

However, the network manager cannot acquire the PCI of the cell under the heterogeneous network manager, and when the PCI is allocated to the serving cell, the PCI collision or confusion may still occur.

Disclosure of Invention

The main objective of the embodiments of the present invention is to provide a PCI allocation method, a base station, an electronic device, and a computer readable storage medium, so as to accurately avoid PCI collision or confusion.

In order to achieve the above object, an embodiment of the present invention provides a method for allocating PCIs applied to a base station, including: acquiring a physical layer cell identifier PCI of a neighboring cell which is the same as a serving cell frequency point; generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and allocating the PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell in the database.

In order to achieve the above object, an embodiment of the present invention further provides a base station, including: the acquisition module is used for acquiring the physical layer cell identifier PCI of the neighboring cell which is the same as the frequency point of the serving cell; and the generation module is used for generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and allocating the PCI for the service cell according to the unavailable PCI list of the service cell in the database by a network manager to which the service cell belongs.

To achieve the above object, an embodiment of the present invention further provides a server, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the PCI allocation method.

To achieve the above object, an embodiment of the present invention further provides a computer readable storage medium storing a computer program, where the computer program implements the above PCI allocation method when executed by a processor.

The embodiment of the invention acquires the PCI of the neighboring cell which is the same as the frequency point of the service cell in real time, and generates an unavailable PCI list for the service cell according to the acquired PCI. The generated unavailable PCI list is synchronized to the database and can be acquired by the network manager to which the service cell belongs, and the network manager allocates PCI for the service cell according to the unavailable PCI list. Compared with the traditional method that the network manager can only acquire the PCI of the cell under the network manager, the embodiment of the invention is not limited to the scene of the same network manager, and the unavailable PCI list can comprise the PCI of all the adjacent cells which are the same as the frequency points of the service cell, so that the network manager can more accurately avoid the situation of PCI conflict or confusion when distributing the PCI for the service cell according to the unavailable PCI list.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures do not depict a proportional limitation unless expressly stated otherwise.

FIG. 1 is a flow chart of a PCI allocation method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a PCI conflict scenario in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a scenario in which PCI confusion is implemented according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a scenario in which information interaction is performed between base stations through an interface according to an embodiment of the present invention;

fig. 5 is a second schematic diagram of a scenario in which information interaction is performed between base stations through an interface according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a third scenario in which information interaction is performed between base stations through an interface according to an embodiment of the present invention;

fig. 7 is a schematic diagram showing interaction between a base station, a network manager and a database according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a networking scenario of regional networking in accordance with an embodiment of the present invention;

FIG. 9 is a flow chart of a PCI allocation method in accordance with another embodiment of the present invention;

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

Fig. 11 is a schematic structural view of an electronic device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present invention. However, the claimed invention may be practiced without these specific details and with various changes and modifications based on the following embodiments. The following divisions of the embodiments are for convenience of description, and should not be construed as limiting the specific embodiments of the present invention, and the embodiments may be mutually combined and referred to without contradiction.

One embodiment of the invention relates to a PCI distribution method applied to a base station. In this embodiment, a base station acquires a physical layer cell identifier PCI of a neighboring cell that is the same as a serving cell frequency point; generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and allocating the PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell in the database. The specific flow of the PCI allocation method of the present embodiment may be as shown in fig. 1.

PCI is the physical layer identification used in LTE and NR networks to uniquely identify one cell, and terminals in LTE and NR use PCI to distinguish between radio signals of different cells. The LTE system includes 504 available PCIs in total, and the NR system includes 1008 available PCIs in total. When the number of cells of the same-frequency networking is large (the number of cells in the LTE system exceeds 504 or the number of cells in the NR system exceeds 1008), PCI multiplexing is unavoidable, that is, the same PCI is used for a plurality of cells. PCI multiplexing involves the following two cases:

(1) PCI collision: the same PCI is used for the cell and the same frequency neighbor cell. If the geographical isolation of two or more co-frequency cells using the same PCI is too small, the User Equipment (UE) cannot normally achieve signal synchronization and decoding in the signal overlapping area of the two cells.

The schematic view of the scene of the PCI collision is shown in fig. 2, in which the systems of the cell a and the cell B are the same, the frequency points are the same, and the same PCI is used, and the PCI of the cell a and the PCI of the cell B collide.

In the case where the systems to which both neighbors where a PCI conflict occurs belong are LTE systems, the PCI conflict can be identified as: PCI collision of LTE-LTE; in the case where the systems to which both neighbors where a PCI conflict occurs belong are NR systems, the PCI conflict can be identified as: PCI collision for NR-NR

(2) PCI confusion: multiple co-frequency neighbors of a cell use the same PCI as each other. Two cells using the same PCI with the same frequency point are isolated in coverage, but are adjacent cells of the same cell, so that when the UE measures and reports the confused PCI, confusion occurs during UE switching, a switching target cell of the UE cannot be determined, and switching failure and call drop are caused.

The scene of PCI confusion is shown in fig. 3, where cell a and cell C are both neighbors of cell B, where the systems to which cell a and cell C belong are the same, the frequency points are the same, and the same PCI is used, and the PCI confusion of cell a and cell C. Wherein, the cell B is an intermediate cell, which can be the same or different system, same frequency or different frequency with the cell A.

In the case that the systems to which the two neighboring cells where the PCI confusion occurs are both LTE systems, if the system to which the intermediate cell belongs is an LTE system, the PCI confusion may be identified as: PCI confusion for LTE-LTE-LTE; if the system to which the intermediate cell belongs is an NR system, the PCI confusion can be identified as: PCI confusion for LTE-NR-LTE.

In the case where the systems to which both neighboring cells where PCI confusion occurs belong are NR systems, if the system to which the intermediate cell belongs is an NR system, the PCI confusion may be identified as: PCI confusion for NR-NR-NR; if the system to which the intermediate cell belongs is an LTE system, the PCI confusion may be identified as: PCI confusion for NR-LTE-NR.

Therefore, the two basic principles of PCI non-collision and PCI non-confusion need to be satisfied when PCI allocation is performed.

The neighbor cell of the base station local service cell is a layer one neighbor cell, and the layer one neighbor cell of the service cell is a layer two neighbor cell of the service cell. For example: b is a layer of neighbors of A, C is a layer of neighbors of B, then C is a layer of neighbors of A. That is, to ensure that the PCIs allocated to the serving cell do not collide or be confused, the PCIs of the serving cell cannot be the same as the PCIs of the first layer co-frequency neighbor cell and the second layer co-frequency neighbor cell.

The serving cell of the base station generally has an initial PCI, however, the change of the frequency point and the PCI of the local cell of the base station, the change of the frequency point and the PCI of the cell outside the base station, the addition or deletion of the external cell, or the addition or deletion of the neighbor relation in the base station may cause the occurrence of PCI collision or confusion. Therefore, it is necessary to timely detect the PCI collision and confusion and optimize the PCI of the serving cell, i.e., reassign a new PCI that does not generate the PCI collision or confusion to the serving cell.

In the conventional technology for allocating the PCI to the serving cell, the network manager has engineering parameters such as frequency points, PCI, longitude and latitude and the like of all cells under the network manager and neighbor relation table information, and when the PCI allocation is performed, the PCI of the cell to be allocated and all cells under the network manager can be ensured not to collide and be confused. However, the above allocation method is not suitable for the scenario of the heterogeneous network manager, and the network manager cannot acquire information such as the project list and the neighbor relation of the cells under the other network manager, so that when allocating the PCI to the service cell, especially the border cell, it cannot be ensured that the PCI of the service cell and the neighbor cell under the heterogeneous network manager are not in conflict and confusion.

The implementation details of the PCI allocation method of the present embodiment are specifically described below, and the following description is provided only for convenience of understanding, and is not necessary to implement the present embodiment. The specific flow is shown in fig. 1, and may include the following steps:

step 101, obtaining PCI of the neighboring cell same as the frequency point of the serving cell.

Specifically, since a cell may collide or be confused with its neighboring cell of the same frequency, the base station acquires the PCI of the neighboring cell that is the same as the serving cell frequency point under the base station.

The system to which the base station that performs the PCI allocation method in the present embodiment belongs is a long term evolution LTE system or a new radio access technology NR system. I.e. the base station may be a base station eNodeB in an LTE system or a base station gNB in an NR system.

In one example, obtaining the physical layer cell identifier PCI of the same neighbor cell as the serving cell frequency point may include: acquiring the cell frequency point, PCI and neighbor relation of the neighbor of the service cell; and acquiring the PCI of the neighboring cell which is the same as the frequency point of the serving cell according to the cell frequency point, PCI and neighboring cell relation of the neighboring cell of the serving cell.

In one example, obtaining the cell frequency point, PCI, and neighbor relation of the neighbor cell of the serving cell may include: acquiring a cell frequency point, PCI and neighbor relation of a neighbor cell of the service cell according to the information of an interface between the base station and the neighbor base station; or, based on the neighbor cell measurement result reported by the User Equipment (UE) in the service cell, acquiring the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell. And acquiring the PCI of the neighbor cell of the serving cell according to the interface information between the base station and the neighbor base station or based on the neighbor cell measurement result reported by the UE under the serving cell, so that the unavailable PCI of the serving cell can be comprehensively acquired.

The scenario diagrams of information interaction between related base stations through interfaces are shown in fig. 4 to 6, wherein the cell frequency point, the PCI and the neighbor relation of the neighbor of the serving cell are obtained according to the information of the interface between the base station and the neighbor base station.

Two adjacent base stations eNB1 and eNB2 shown in fig. 4 belong to a network manager 1 and a network manager 2 respectively, and information interaction between an intra-station cell and a neighboring cell thereof can be performed through an established X2 interface between the eNB1 and the eNB 2.

Two adjacent base stations gNB1 and gNB2 shown in FIG. 5 belong to a network manager 3 and a network manager 4 respectively, and information interaction between the intra-station cell and the adjacent cell can be carried out through an established Xn interface between the gNB1 and the gNB 2.

Two adjacent base stations eNB1 and gNB1 shown in FIG. 6 belong to a network manager 1 and a network manager 3 respectively, and information interaction between an intra-station cell and a neighboring cell thereof can be carried out through an established EN-DC X2 interface between the eNB1 and the gNB 1.

Step 102, according to the obtained PCI, generating an unavailable PCI list of the service cell, synchronizing the unavailable PCI list into a database, and allocating PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell.

Specifically, the base station adds the PCI in which collision or confusion with the serving cell occurs to the unavailable PCI list of the serving cell according to the acquired PCIs of the serving cell neighbors. Further, the unavailable PCI list is synchronized to the database, so that the network manager to which the service cell belongs can allocate PCI for the service cell according to the unavailable PCI list of the service cell.

The database according to the present embodiment stores the unavailable PCI list of all the serving cells of the base station, and supports writing of the base station and reading of the network manager.

In one example, the same neighbor cell as the serving cell frequency point is different from the network manager to which the serving cell belongs. The unavailable PCI list comprises the PCI of the neighbor cell of the service cell under the heterogeneous network management, so that the network management can more accurately avoid the situation of PCI conflict or confusion when distributing the PCI for the service cell according to the unavailable PCI list.

In another example, in the case of obtaining the cell frequency point, PCI, and neighbor relation of the neighbor cell of the serving cell according to the message of the interface between the base station and the neighbor base station, the generating the list of unavailable PCIs of the serving cell according to the obtained PCI may include: adding the PCI of the first layer neighbor cell and the second layer neighbor cell of the service cell to the unavailable PCI list under the condition that the base station and the system of the neighbor base station are the same; and adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list under the condition that the base station is different from the system to which the neighbor base station belongs. In the case that one layer of neighbor cells of the service cell is different from the system to which the service cell belongs, no PCI conflict occurs, so that the PCI of the two layers of neighbor cells is added to the unavailable PCI list, and the unavailable PCI can be comprehensively included.

Under the condition that the neighbor cell measurement result reported by the User Equipment (UE) in the service cell is based on the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell, the generating the unavailable PCI list of the service cell according to the acquired PCI may include: and adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list.

In an exemplary embodiment, a list of unavailable PCIs is generated for a serving cell under an LTE system. Firstly adding unavailable PCI to an unavailable PCI list according to the information of the interface between the base station and the adjacent base station.

When the neighboring base station of the LTE base station eNB1 is a base station in the LTE system, after the base station eNB1 establishes the connection of the X2 interface with the neighboring base station eNB2, the related information of the local cell of the neighboring base station eNB2 and a layer of neighboring cells thereof can be obtained. The acquired information of the cell comprises the following steps: LTE Cell global identity (E-UTRAN Cell Global Identifier, abbreviated as "ECGI"), where ECGI = PLMN + eNodeB ID + Cell ID, where PLMN is a public land mobile network (Public Land Mobile Network); PCI of LTE cell; and the LTE cell carrier downlink center frequency point.

Further, the base station sequentially generates an unavailable PCI list of cells for the serving cell under the base station eNB1 according to the acquired information. For the serving cell ECGI1 under the eNB1, first, find all the one-layer LTE neighbor cells belonging to the eNB2 and the two-layer LTE neighbor cells obtained from the X2 interface message from the neighbor cell list of the cell, where the information of the one-layer neighbor cells and the two-layer neighbor cells of the cell ECGI1 obtained by the base station eNB1 according to the interface message with the neighbor base station eNB2 is shown in table 1.

TABLE 1

If the PCI reassigned by the base station to the serving cell is the same as the LTE neighbor cell of the same layer as the frequency point, the PCI conflict of the LTE-LTE type occurs, so that the PCI (5) of the LTE neighbor cell of the same frequency as the serving cell needs to be added into an unavailable PCI list.

If the PCI reassigned by the base station to the serving cell is the same as that of the two-layer LTE neighbor cell with the same frequency point, the PCI confusion of the LTE-LTE-LTE type occurs, so that the PCI (8 and 91) of the two-layer LTE neighbor cell with the same frequency as that of the LTE serving cell needs to be added into an unavailable PCI list.

Therefore, the base station generates, for the serving cell ECGI1, the unavailable PCI list according to the interface message with the neighboring base station eNB2, and adds the PCI to be: {5,8,91}.

When the neighboring base station of the LTE base station eNB1 is a base station under the NR system, after the base station eNB1 establishes a 4G-5G dual connectivity (EUTRA-NR Dual Connectivity, abbreviated as "EN-DC") X2 interface connection with the neighboring base station gNB2, relevant information of a local NR cell of the neighboring base station gNB2 and a layer of LTE neighboring cell thereof may be obtained. The acquired information of the cell comprises the following steps: NR Cell global identity (NR Cell Global Identifier, abbreviated as "NCGI"), where ncgi=plmn+gnobid+cell ID; PCI of LTE cell; and the LTE cell carrier downlink center frequency point.

Further, the base station sequentially generates an unavailable PCI list of cells for the serving cell under the base station eNB1 according to the acquired information. For example, for the serving cell ECGI1 under the eNB1, first, all the first-layer NR neighbor cells belonging to the gNB2 and the second-layer LTE neighbor cells acquired from the EN-DC X2 message are found from the neighbor list of the cell, and the information of the first-layer neighbor cells and the second-layer neighbor cells of the cell ECGI1 acquired by the base station eNB1 according to the interface message with the neighbor base station gNB2 is shown in table 2.

TABLE 2

If the PCI reassigned by the base station to the serving cell is the same as that of the two-layer LTE neighbor cell with the same frequency point, the PCI confusion of the LTE-NR-LTE type occurs, so that the PCI (15 and 78) of the two-layer LTE neighbor cell with the same frequency as that of the LTE serving cell needs to be added into an unavailable PCI list.

Therefore, the base station generates, for the serving cell ECGI1, the unavailable PCI list according to the interface message with the neighbor base station gNB2, where the PCI to be added is: {15,78}.

Under the condition that the base station eNB1 acquires the cell frequency point, PCI and neighbor relation of the neighbor cell of the service cell based on the neighbor cell measurement result reported by the user equipment UE in the service cell, the UE in the LTE service cell reports other unknown LTE cell PCI which has the same frequency as the service cell to the base station, and the PCI is not in the neighbor cell list of the service cell. The information of the first layer neighbor cell and the second layer neighbor cell of the cell ECGI1 obtained by the base station according to the neighbor cell measurement result reported by the UE is shown in table 3.

TABLE 3 Table 3

The UE in the LTE serving cell can detect the signal of the unknown cell, which indicates that the coverage of the cell and the serving cell may overlap, and if the PCI reassigned by the base station to the serving cell is the same as the unknown LTE cell with the same frequency point, a PCI collision of LTE-LTE type may occur, so that the PCI of the unknown LTE cell with the same frequency as the LTE serving cell needs to be added to the unavailable PCI list. Therefore, the neighbor cell measurement result reported by the base station UE is the PCI to be added in the generated unavailable PCI list of the serving cell ECGI1, which is: {9}.

The PCI in the generated unavailable PCI list for the serving cell ECGI1 is {5,8,9,15,78,91} by combining the information of the serving cell neighbor cells obtained according to the different manners.

In addition, it should be noted that, to prevent the occurrence of PCI confusion of LTE-LTE type, the base station should add PCI (9) to its list of unavailable PCIs for serving Cell PLMN1+enodeb1+cell0 under the base station according to the neighbor Cell measurement result reported by the UE. PCI is added to its list of unavailable PCI for serving Cell PLM1+eNode1+Cell2 under the base station (92).

It is worth mentioning that, for a cell under the LTE system, the acquired frequency point information is a center frequency point; for cells under the NR system, the acquired frequency point information is a synchronization signal and a PBCH block (Synchronization Signal and PBCH block, abbreviated as "SSB") frequency point.

When the network manager optimizes the service cell with PCI conflict or confusion after the base station generates the unavailable PCI list for the service cell, the unavailable PCI list of the service cell to be optimized can be read from the database, the unavailable PCI in the list is filtered from all available PCI fragments, and then one PCI meeting the constraint conditions in the other traditional technologies is selected from the rest available PCI for the cell to be allocated. The constraint conditions in the conventional technology include that adjacent cells are unequal in PCI (peripheral component interconnect) mode 3 or 30, multiplexing distance, multiplexing layer number, balance and other parameters meet preset conditions and the like.

In the actual implementation of the PCI allocation method according to this embodiment, a PCI collision or confusion detection module and an unavailable PCI list statistics and maintenance module may be set at the base station side, a PCI optimization module may be set at the network management side, an unavailable PCI list storage module may be set in the database, and a schematic diagram of interaction between the base station and the network management and the database is shown in fig. 7. The list of unavailable PCIs is denoted by pcibacklist in fig. 7. The base station may also be configured to report the dynamic of the list of unavailable PCIs to the network manager.

The PCI allocation method according to this embodiment is also applicable in a heterogeneous network management scenario, where the heterogeneous network management may be a different network management of the same manufacturer, or may be a different network management of a different manufacturer. The networking scenario to which the PCI allocation method according to the present embodiment is applied may be regional networking or flower arrangement networking. A networking scenario of regional networking is shown in fig. 8.

It should be noted that, for the distributed PCI allocation manner, that is, the network manager allocates a PCI list to each cell and issues the PCI list to the base station, then the base station allocates a PCI value to each cell from the PCI list, and the base station under the network manager can interact information with the base station under the heterogeneous network manager through the interface, so as to obtain the information of the frequency point, the PCI, the neighbor relation and the like of the heterogeneous network management base station cell in real time. However, this PCI allocation method often requires frequent real-time interaction between the network manager and the base station, which is inefficient and difficult to implement and maintain. Under the condition that a plurality of base stations in the whole network need to perform PCI optimization on a local cell, if a new PCI list needs to be applied to a network manager at the same time, a network manager message storm is easily caused, the network manager is blocked to cause network manager paralysis, and huge loss is caused to the whole network. The embodiment of the invention can realize the effects of avoiding frequent interaction between the network manager and the base station and improving PCI distribution efficiency for the distributed PCI distribution mode.

The embodiment acquires the PCI of the neighboring cell which is the same as the frequency point of the service cell in real time, and generates an unavailable PCI list for the service cell according to the acquired PCI. The generated unavailable PCI list is synchronized to the database and can be acquired by the network manager to which the service cell belongs, and the network manager allocates PCI for the service cell according to the unavailable PCI list. Compared with the traditional method that the network manager can only acquire the PCI of the cell under the network manager, the embodiment of the invention is not limited to the scene of the same network manager, and the unavailable PCI list can comprise the PCI of the different network manager cell which is the same as the frequency point of the service cell, so that the network manager can more accurately avoid the situation of PCI conflict or confusion when distributing the PCI for the service cell according to the unavailable PCI list.

Another embodiment of the present invention relates to a PCI allocation method, and the following details of implementation of the PCI allocation method of the present embodiment are specifically described, which are provided for convenience of understanding only, and are not necessary for implementing the present embodiment, and the specific flow is shown in fig. 9, and includes:

step 901, obtaining the PCI of the neighboring cell which is the same as the frequency point of the serving cell.

Step 902, according to the obtained PCI, generating an unavailable PCI list of the service cell, synchronizing the unavailable PCI list into a database, and allocating PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell.

It will be appreciated that, in this embodiment, steps 901 and 902 are the same as

steps

101 and 102 in the previous embodiment, and the related technical details mentioned in the previous embodiment are still valid in this embodiment, so that repetition is reduced, and a detailed description is omitted here.

Step 903, obtaining the PCI of the neighboring cell identical to the serving cell frequency point in real time.

Because the frequency point and PCI of the local cell of the base station may change, the frequency point and PCI i of the cell outside the base station may change, the external cell may be added or deleted, or the neighbor relation in the base station may be added or deleted, and these factors may cause PCI collision or confusion to be generated again for the PCI allocated to the serving cell. Therefore, the base station needs to continuously collect the information of the neighboring cells in real time to acquire the confusion or collision of the PCIs.

Step 904, updating the unavailable PCI list according to the PCI acquired in real time, and synchronizing the unavailable PCI list into a database.

Because the change of the neighbor cell information may change the unavailable PCI of the serving cell, the base station needs to update the unavailable PCI list according to the PCI acquired in real time, so as to avoid the occurrence of PCI collision or confusion. And the base station synchronizes the updated unavailable PCI list to the database so that the network manager can acquire the unavailable PCI list and allocate new PCI for the service cell according to the updated PCI list.

In an exemplary embodiment, the base station eNB1 in the LTE system has generated respective unavailable PCI lists for the three serving cells Cell0, cell1, and Cell2 under the base station as shown in table 4.

TABLE 4 Table 4

eNB ID+Cell ID+center frequency point	List of unavailable PCI
		eNB1+Cell0+1850	{1,2,8,10}
eNB1+Cell1+1850	{0,2,8,11,13}
		eNB1+Cell2+1850	{0,1,8,12,15}

And the eNB1 acquires the updated local cell of the neighboring base station eNB2 and the related information of one layer of neighboring cells thereof through the received message of the X2 interface. And in the local cell of the eNB2 and one layer of neighbor cells thereof, finding out the same-frequency one layer and the same-frequency two layer neighbor cells of each cell under the eNB1, putting the PCI of the neighbor cells into an unavailable PCI list, and recording the detection adding times and the detection time. The list of unavailable PCIs for the three serving cells Cell0, cell1, and Cell2 under eNB1 are shown in tables 5 to 7, respectively.

TABLE 5

TABLE 6

TABLE 7

If the network manager needs to perform PCI reassignment on Cell0 under eNB1, the latest unavailable PCI list of the serving Cell0 is read: {1,2,8,10,17,24}, assuming that the available PCI segment of Cell0 is 0-503, PCI in the unavailable PCI list is filtered out, and PCI is allocated again.

In one example, after updating the unavailable PCI list according to the PCI acquired in real time, the method may further include: deleting the PCI with the time interval between the adding time and the current time exceeding the preset threshold value from the unavailable PCI list under the condition that the number of the PCI in the unavailable PCI list is larger than the preset threshold value; wherein the number of deleted PCI is not more than the preset number which can be deleted. The number of deleting PCI in the unavailable PCI list can not exceed a preset value every time, so that the too fast deleting of PCI can be prevented, and the influence on a system is avoided.

In an exemplary embodiment, the base station reports the obtained unavailable PCI update addition time to the received interface message or UE measurement, and records the number of additions. The base station maintains a list of unavailable PCIs for each home cell under the base station, one of which is shown in table 8.

TABLE 8

Unavailable PCI	Time of last addition	Number of additions
			0	2020.04.03	4
2	2020.03.12	3
			8	2020.03.03	2
......	......

As shown in table 8, the base station sorts the PCIs in the list of unavailable PCIs according to the last addition time, with the last added row being the forefront. If the last addition time is the same, the addition times are ordered from big to small. In addition to the conditions for PCI deletion in the above example, in order to prevent the unusable PCI from being deleted too quickly, which affects the system, a limit may be set to delete at most N unusable PCIs meeting the conditions and being ranked at the lowest of the list per day.

According to the method, PCI of the neighbor cell which is the same as the frequency point of the service cell is obtained in real time, the unavailable PCI list of the service cell is updated according to the PCI obtained in real time, and the updated list is synchronized to a database for network management to obtain, so that the network management can read the continuously updated unavailable PCI list in the database, and further allocate PCI for the service cell according to the continuously updated unavailable PCI list.

Another embodiment of the present invention relates to a base station, as shown in fig. 10, comprising:

an obtaining module 1001, configured to obtain a physical layer cell identifier PCI of a neighboring cell that is the same as a serving cell frequency point;

a generating module 1002, configured to generate an unavailable PCI list of the serving cell according to the acquired PCIs, and synchronize the unavailable PCI list to a database, so that a network manager to which the serving cell belongs allocates PCIs for the serving cell according to the unavailable PCI list of the serving cell in the database.

In an example, the obtaining module 1001 may be further configured to obtain a cell frequency point, a PCI, and a neighbor relation of a neighbor of the serving cell; and acquiring the PCI of the neighboring cell which is the same as the frequency point of the serving cell according to the cell frequency point, PCI and neighboring cell relation of the neighboring cell of the serving cell.

In an example, the obtaining module 1001 may be further configured to obtain, according to a message of an interface between the base station and a neighboring base station, a cell frequency point, a PCI, and a neighboring cell relationship of a neighboring cell of the serving cell; or, based on the neighbor cell measurement result reported by the User Equipment (UE) in the service cell, acquiring the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell.

In an example, the generating module 1002 may be further configured to, when the message according to the interface between the base station and the neighboring base station obtains a cell frequency point, a PCI, and a neighboring cell relationship of the neighboring cell of the serving cell, generate, according to the obtained PCI, an unavailable PCI list of the serving cell, and add PCIs of a first layer neighboring cell and a second layer neighboring cell of the serving cell to the unavailable PCI list when the base station is the same as a system to which the neighboring base station belongs; adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list under the condition that the base station is different from the system to which the neighbor base station belongs; and under the condition that the neighbor cell measurement result reported by the User Equipment (UE) in the service cell is based on the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell, generating an unavailable PCI list of the service cell according to the acquired PCI, and adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list.

In an example, the base station may further include an updating module, configured to generate, according to the acquired PCI, an unavailable PCI list of the serving cell, and synchronize the unavailable PCI list to a database, so that a network manager to which the serving cell belongs acquires, in real time, PCIs of a neighboring cell that is the same as a frequency point of the serving cell after allocating PCIs to the serving cell according to the unavailable PCI list of the serving cell in the database; and updating the unavailable PCI list according to the PCI acquired in real time, and synchronizing the unavailable PCI list into a database.

In an example, the base station may further include a deletion module, configured to delete, in the unavailable PCI list, a PCI whose time interval between the addition time and the current time exceeds a preset threshold when the number of PCIs in the unavailable PCI list is greater than a preset threshold after updating the unavailable PCI list according to the PCIs acquired in real time; wherein the number of deleted PCI is not more than the preset number which can be deleted.

The base station provided in this embodiment acquires the PCIs of the same neighbor cells as the serving cell frequency points in real time, and generates an unavailable PCI list for the serving cell according to the acquired PCIs. The generated unavailable PCI list is synchronized to the database and can be acquired by the network manager to which the service cell belongs, and the network manager allocates PCI for the service cell according to the unavailable PCI list. Compared with the traditional method that the network manager can only acquire the PCI of the cell under the network manager, the embodiment of the invention is not limited to the scene of the same network manager, and the unavailable PCI list can comprise the PCI of all the adjacent cells which are the same as the frequency points of the service cell, so that the network manager can more accurately avoid the situation of PCI conflict or confusion when distributing the PCI for the service cell according to the unavailable PCI list.

It is to be noted that this embodiment is a system embodiment corresponding to the above-described method embodiment, and this embodiment can be implemented in cooperation with the above-described method embodiment. The related technical details and technical effects mentioned in the above embodiments are still valid in this embodiment, and in order to reduce repetition, they are not described here again. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the above-described embodiments.

It should be noted that, each module in the above embodiment of the present invention is a logic module, and in practical application, one logic unit may be one physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, units that are not so close to solving the technical problem presented by the present invention are not introduced in the present embodiment, but this does not indicate that other units are not present in the present embodiment.

An embodiment of the invention also provides an electronic device, as shown in fig. 11, comprising at least one processor 1101; and a memory 1102 communicatively coupled to the at least one processor 1101; the memory 1102 stores instructions executable by the at least one processor 1101, and the instructions are executed by the at least one processor 1101 to enable the at least one processor 1101 to perform the PCI allocation method described above.

Where the memory 1102 and the processor 1101 are connected by a bus, the bus may comprise any number of interconnected buses and bridges, which connect the various circuits of the one or more processors 1101 and the memory 1102 together. The bus may also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or may be a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 1101 is transmitted over a wireless medium via an antenna, which further receives the data and transmits the data to the processor 1101.

The processor 1101 is responsible for managing the buses and general processing, and may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 1102 may be used to store data used by processor 1101 in performing operations.

The above product may execute the PCI allocation method provided by the embodiment of the present application, and has the corresponding functional module and beneficial effect of the execution method, and technical details not described in detail in the embodiment of the present application may refer to the method provided by the embodiment of the present application.

Embodiments of the present application also provide a computer-readable storage medium storing a computer program. The computer program, when executed by the processor, implements the PCI allocation method described above.

Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, where the program includes several instructions for causing a device (which may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The embodiments described hereinabove are intended to provide those of ordinary skill in the art with a variety of modifications and variations to the embodiments described above without departing from the inventive concepts of the present application, and thus the scope of the invention is not limited by the embodiments described hereinabove, but is to be accorded the broadest scope of the innovative features recited in the claims.

Claims

1. The PCI distributing method is applied to the base station and is characterized by comprising the following steps:

acquiring a physical layer cell identifier PCI of a neighboring cell which is the same as a serving cell frequency point;

generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and allocating the PCI for the service cell by a network manager to which the service cell belongs according to the unavailable PCI list of the service cell in the database.

2. The PCI allocation method according to claim 1, wherein said obtaining the physical layer cell identity PCI of the same neighbor cell as the serving cell frequency point comprises:

acquiring the cell frequency point, PCI and neighbor relation of the neighbor of the service cell;

and acquiring the PCI of the neighboring cell which is the same as the frequency point of the serving cell according to the cell frequency point, PCI and neighboring cell relation of the neighboring cell of the serving cell.

3. The PCI allocation method according to claim 2, wherein said obtaining the cell frequency point, PCI, neighbor relation of the neighbor cell of the serving cell comprises:

acquiring a cell frequency point, PCI and neighbor relation of a neighbor cell of the service cell according to the information of an interface between the base station and the neighbor base station;

or, based on the neighbor cell measurement result reported by the User Equipment (UE) in the service cell, acquiring the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell.

4. The PCI allocation method according to claim 3, wherein in the case of acquiring a cell frequency point, a PCI, a neighbor relation of a neighbor cell of the serving cell according to the message of the interface between the base station and the neighbor base station, the generating the list of unavailable PCIs of the serving cell according to the acquired PCIs includes:

adding the PCI of the first layer neighbor cell and the second layer neighbor cell of the service cell to the unavailable PCI list under the condition that the base station and the system of the neighbor base station are the same;

adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list under the condition that the base station is different from the system to which the neighbor base station belongs;

or under the condition that the neighbor cell measurement result reported by the User Equipment (UE) in the service cell is based on the cell frequency point, PCI and neighbor cell relation of the neighbor cell of the service cell, generating an unavailable PCI list of the service cell according to the acquired PCI comprises the following steps:

and adding the PCI of the two-layer neighbor cell of the service cell to the unavailable PCI list.

5. The PCI allocation method according to claim 1, wherein after generating an unavailable PCI list of the serving cell according to the acquired PCIs and synchronizing the unavailable PCI list into a database, a network manager to which the serving cell belongs allocates PCIs for the serving cell according to the unavailable PCI list of the serving cell in the database, further comprising:

acquiring the PCI of the neighboring cell which is the same as the frequency point of the service cell in real time;

and updating the unavailable PCI list according to the PCI acquired in real time, and synchronizing the unavailable PCI list into a database.

6. The PCI allocation method according to claim 5, wherein after said updating said list of unavailable PCIs based on PCIs acquired in real time, further comprising:

deleting the PCI with the time interval between the adding time and the current time exceeding the preset threshold value from the unavailable PCI list under the condition that the number of the PCI in the unavailable PCI list is larger than the preset threshold value; wherein the number of deleted PCI is not more than the preset number which can be deleted.

7. The PCI allocation method according to any one of claims 1 or 6, wherein said neighbor cell identical to a serving cell frequency point is different from a network manager to which said serving cell belongs.

8. The PCI allocation method according to any one of claims 1 or 6, wherein the system to which the base station belongs is a long term evolution, LTE, system or a new radio access technology, NR, system.

9. A base station, comprising:

the acquisition module is used for acquiring the physical layer cell identifier PCI of the neighboring cell which is the same as the frequency point of the serving cell;

and the generation module is used for generating an unavailable PCI list of the service cell according to the acquired PCI, synchronizing the unavailable PCI list into a database, and allocating the PCI for the service cell according to the unavailable PCI list of the service cell in the database by a network manager to which the service cell belongs.

10. An electronic device, comprising:

at least one processor; the method comprises the steps of,

a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the PCI allocation method of any one of claims 1 to 8.

11. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the PCI allocation method of any one of claims 1 to 8.