CN101720096B - Self-configuration method of physical cell ID in LTE cellular network - Google Patents

Abstract

The invention discloses a self-configuration method of a physical cell ID in an LTE cellular network, which mainly solves the problem of the contradiction between the limited number of PCIs and the huge number of wireless cells in the LTE system. The steps are as follows: the base station divides the distribution area into closely connected square virtual cells according to the network scale; assigns a locally unique virtual cell address to each virtual cell according to the principle of space division multiplexing; The address of the cell, which is used as the identification segment in the PCI cluster; OAM determines the used address set and initializes the standby address set; performs conflict resolution on the conflicting cell; configures the identification segment in the PCI cluster for the newly introduced cell; OAM The standby address set is updated in real time according to the report of the base station; the OAM completes the configuration of the PCI inter-cluster identification segment. The invention effectively alleviates the contradiction between the limited number of PCIs and the huge number of wireless cells, can better adapt to the trend of coexistence of various base stations in heterogeneous networks in the future, and facilitates network expansion.

Description

Self-configuration method of physical cell ID in LTE cellular network

technical field

The present invention relates to the field of wireless communication, in particular to the third-generation mobile communication long-term evolution 3GPP LTE system, and specifically proposes a distributed method for automatic configuration of a physical cell ID based on geographic location information of a base station eNB.

Background technique

In the third-generation mobile communication long-term evolution system, 504 physical cell IDs are supported, so the multiplexing of physical cell IDs in different cells is inevitable. In the 3GPP technical specification TS 36.902V1.0.1, it is clarified that the allocation of physical cell IDs should follow the following two guidelines:

No conflict, that is, one wireless cell cannot use the same physical cell ID as its neighbor cell;

No confusion, ie one radio cell cannot have neighbor cells using the same physical cell ID.

The above principles can be summarized as that within two hops, the physical cell ID of the cell cannot be reused, but can be reused outside the range of two hops. However, in order to reduce the interference between cells, it is necessary to maximize the distance between multiplexing cells of the physical cell ID as much as possible.

When a new base station eNB is introduced into an area, it is necessary to select an effective physical cell ID for each wireless cell supported by the base station, and avoid conflict or confusion with the physical cell IDs of neighboring cells. As shown in FIG. 1 , C is a newly introduced base station eNB, and physical cell IDs need to be configured for cells C1 and C2, and must not conflict or be confused with existing physical cell IDs.

Existing configuration strategies related to physical cell IDs are mainly divided into two types: centralized configuration strategies and distributed configuration strategies. The architecture of two configuration strategies has been determined, and the architecture is described as follows:

(1) Operation and maintenance OAM should provide a valid physical cell ID list or a certain physical cell ID value, from which the base station can select.

(2) The base station should select the physical cell ID based on a centralized or distributed method:

1) Centralized physical cell ID allocation scheme: OAM sends a specific physical cell ID value to the base station as the physical cell ID value of the base station cell.

2) Distributed physical cell ID allocation scheme: OAM sends a list of physical cell IDs to the base station, and the base station randomly selects a physical cell ID from it.

In the study of sensor networks, Tian Ye, Sheng Min, Li Jiandong and others proposed a new sensor network MAC address allocation algorithm. This algorithm aims at the problem of high MAC address overhead in sensor networks. Features, the method of geographic location mapping is used to multiplex the MAC address space, which effectively reduces the length of the MAC address of the node and prolongs the life cycle of the sensor node. The characteristic that the MAC address only needs to be unique in a local area is similar to the requirement of no conflict and no confusion in the allocation process of the physical cell ID. Therefore, this algorithm can be used for self-configuration of the physical cell ID in the LTE cellular network.

In a traditional cellular communication system, configuration of a physical cell ID is performed in a network planning manner. As the number of cells increases, the contradiction between the limited number of physical cell IDs and the huge number of cells becomes more prominent. In addition, the traditional method cannot be upgraded to adapt to the trend of coexistence of macro cell base stations, pico cell base stations and femto cell base stations in a future heterogeneous network.

Contents of the invention

Aiming at the contradiction between the limitation of the number of physical cell IDs and the huge number of cells and the difficulty of network upgrade in traditional planning methods, the present invention proposes a method for self-configuring physical cell IDs in LTE cellular networks, making full use of physical cell IDs The spatial multiplexing of the newly introduced wireless cells is configured with no conflicts and no confusion of physical cell IDs, so as to adapt to the trend of coexistence of multiple types of base stations in heterogeneous networks in the future.

The purpose of the present invention is achieved like this:

One. the definitions involved in the present invention are as follows:

Multiplexed cells refer to virtual cells with the same address;

The reuse distance d _r refers to the distance between the centers of adjacent reuse cells;

The address length b refers to the number of bits occupied by the address field;

The address space Ω refers to |Ω|=2 ^b , where the elements are 0～(2 ^b -1);

The virtual cell address set A _cell refers to a collection of virtual cell addresses;

A virtual cell cluster refers to a unit composed of a cluster of virtual cells using all addresses in A _cell ;

The base station used address set A _eNB refers to the set of addresses used by all base stations in the same cell cluster;

The spare address set A _spare means that A _spare =Ω-A _eNB ;

|x| refers to the potential of the set x, indicating the number of elements in the set x.

2. Technical solution

According to the network scale and the principle of space division multiplexing, the present invention divides the ID of the physical cell into two parts, the identification segment within the cluster of virtual cells and the identification segment between clusters of virtual cells, and configures them respectively:

A. Configuration steps of the identification segment in the cluster

(A1) The base station divides the base station distribution area into closely connected square virtual cells by constructing a virtual grid;

(A2) According to the principle that the address of the virtual community within the two-hop range cannot be reused, determine the reuse distance d _r and the address space Ω, and assign a locally unique number to each virtual community as the address of the virtual community according to the principle of space division multiplexing;

(A3) According to the position coordinates of the base station, the virtual cell to which the base station belongs is obtained by mapping, and under the premise of no conflict, the virtual cell address is used as the intra-cluster identification segment of the physical cell ID of the cellular cell;

(A4) Each base station reports its used virtual cell address to the OAM, and the OAM determines the used address set A _eNB according to the report information, removes the used address set A _eNB from the address space Ω, and obtains the initial spare address set A _spare ;

(A5) When a physical cell ID conflict is detected, the base station that changes the physical cell ID requests to send a backup address set to the OAM, and the OAM sends the backup address set to the base station, and the base station selects a new one from the backup address set in a random selection mode The virtual cell address is used as the identification segment in the physical cell ID cluster and reported to the OAM; the OAM updates the standby address set;

B. Configuration steps of the inter-cluster identification segment

After step (A2), OAM divides the base station distribution area with virtual cell clusters as a unit, and OAM distributes a number for each virtual cell cluster as the inter-cluster identification segment of each physical cell ID in the virtual cell cluster; the inter-cluster identification segment The length of is the total length of the physical cell ID minus the length of the identification segment in the cluster.

The configuration of the intra-cluster identification segment of a newly introduced cell starts from step (A3) and ends at step (A5).

If the spare addresses in a certain virtual cell cluster are exhausted, continue to introduce new wireless cells, only need to re-run the method of the present invention in the virtual cell cluster according to the new network scale, and increase the ID of the physical cell in the virtual cell cluster The length of the intra-cluster identification segment is configured with the intra-cluster identification segment of the new physical cell ID; the OAM configures a new inter-cluster identification segment for the virtual cell cluster.

The update mechanism of the spare address set A _spare is described as follows: if the base station uses a virtual cell address from the spare address set for conflict resolution or a newly introduced cell, the base station reports to the OAM, and the OAM removes the address from the spare address set Delete; if a virtual cell address used by the base station is released, the base station reports to the OAM, and the OAM adds the address to the standby address set.

In the self-configuration method, the ID of the physical cell is divided into two parts: the identification segment within the virtual cell cluster and the identification segment between clusters of the virtual cell cluster, and is configured respectively: the identification segment within the cluster is configured by the base station, and the identification segment between the clusters is determined by OAM , to achieve a distributed and centralized architecture.

The self-configuration method described above is designed to be applicable to the scenario where one base station corresponds to one wireless cell; for the scenario where one base station supports multiple wireless cells, the rest of the wireless cells can be regarded as newly introduced wireless cells, so Still applies.

The present invention has the following advantages:

1) The present invention can make full use of the spatial multiplexing of physical cell IDs due to the use of mapping based on base station geographic location information, effectively reducing the possibility of collision and confusion in the physical cell IDs of macro cells, and alleviating the limitation of the number of physical cell IDs and wireless cell IDs. a huge number of contradictions;

2) Due to the introduction of the concept of virtual cell clusters in the present invention, the configuration of the identification segment between physical cell ID clusters can increase the distance between cells using the same physical cell ID, thereby reducing interference;

3) Since the present invention adopts the method of spatial multiplexing, the number of physical cell IDs used for macro cells is relatively small, so a relatively large reserved space for physical cell IDs can be provided for non-macro cells, and the number of pico cells and femto cells can be reduced. The possibility of physical cell ID conflicts can better adapt to the trend of coexistence of multiple types of base stations in heterogeneous networks in the future;

4) The present invention simplifies the process of physical cell ID reselection when a conflict occurs due to the use of the standby address set and the real-time update mechanism of the standby address set, and improves reselection efficiency;

5) The countermeasures taken by the present invention for the situation that the spare addresses in a certain virtual cell cluster are exhausted only have an effect on the virtual cell cluster, so under normal circumstances, it will not affect the configuration of physical cell IDs in the surrounding cell clusters , so it can avoid the situation that "one small thing affects the whole body" and facilitates the expansion of the network.

Description of drawings

Fig. 1 is a schematic diagram of an existing use case used by the present invention;

Fig. 2 is the configuration flowchart of physical cell ID among the present invention;

Fig. 3 is a schematic diagram of virtual cells and virtual cell clusters divided in the configuration process of the present invention;

Fig. 4 is a schematic diagram of spatial multiplexing of addresses in the configuration process of the present invention;

Detailed ways

With reference to Fig. 2, the specific implementation steps of the present invention are as follows:

1. Configuration steps of the identification segment in the cluster

In step 1, the base station divides the base station distribution area into closely connected square virtual cells by constructing a virtual grid.

Since the base station uses the address of its virtual cell as its physical cell ID, in order to avoid address conflicts, it should meet the following requirements when dividing virtual cells: each virtual cell contains only one base station on average. The division of virtual cells is shown in Figure 3. In FIG. 3 , regular hexagons with solid lines represent cells, the base station is located at the center of the cells, and squares with dotted lines represent virtual cells.

In an area with area S _field where N base stations are uniformly distributed, the average number of base stations n in a single virtual cell only depends on the base station density ρ in the distribution area S _field and the virtual cell area S _cell , namely $\mathrm{no}=\mathrm{\&rho;}\&CenterDot;S_{\mathrm{cell}}=\frac{N}{S_{\mathrm{field}}}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="H2009102192166E00041.png"\; state="\{\{state\}\}">d</figure-callout>}}^2$ When there is only one base station in the virtual cell, that is, when n=1, the side length of the virtual cell $d=\sqrt{\frac{S_{\mathrm{field}}}{N}}---\left(1\right)$

According to (1), the side length d of the virtual cell only depends on S _field and N, and these two parameters can be determined in the network design stage. This means that the base station can obtain the S _field and N in advance and construct the same virtual grid in the same position coordinate system, and theoretically guarantee that each base station corresponds to a virtual cell.

Step 2, according to the principle that virtual cell addresses within two hops cannot be reused, determine the reuse distance d _r and address space Ω, and assign a locally unique number to each virtual cell as the virtual cell address according to the principle of space division multiplexing, The addresses of the virtual cells are assigned and spatially multiplexed from the origin of the coordinates in the order from bottom left to top right.

Since the base station selects the address of the virtual cell where it is located as the identification segment in the physical cell ID cluster of the cell, the allocation of the identification segment in the physical cell ID cluster can be converted into the allocation of the address of the virtual cell. Assuming that the distance between two adjacent base stations is R, the maximum distance between two hop base stations is 2R. Specific steps are as follows:

1) For any base station i, set the identification segment in its physical cell ID cluster as A _i , and make a circle with base station i as the center and 2R as the radius, indicating the range of two hops; in order to ensure no conflict and confusion, within the range of 2R All base stations cannot reuse the address A _i ; corresponding to a virtual cell, the addresses of all virtual cells within the 2R range must be different from the address of the virtual cell where base station i is located, that is, the local uniqueness of the address of the virtual cell; within the range of two hops The number of virtual cells is jointly determined by R and d.

Figure 4a uses R=d as an example to show the situation when base station i is located in the center of virtual cell A. The dotted circle represents the 2R range, and the hatching represents all or part of the virtual cells located within the 2R range of base station i. They must Use an address different from virtual cell A.

2) Determining multiplexing cells and dividing virtual cell clusters.

Figure 4b shows the situation where base station i is located in the center of the virtual cell, and the virtual cell closest to virtual cell A outside the 2R range is selected as the multiplexing cell, represented by a gray square. The virtual cells within the reuse distance must use addresses different from those of the virtual cell A, and together with the virtual cell A, they form a virtual cell cluster, indicated by a thick line.

As shown in Figure 4c, in the most extreme case, that is, when base station i is located at the apex of virtual cell A, the multiplexing cell is still located outside the 2R range of base station i, and no collision will occur.

3) As shown in Figure 4d, virtual cell addresses are allocated from the origin of the coordinates in the order from bottom left to top right and are spatially multiplexed in units of virtual cell clusters. The squares with thick solid lines represent virtual cell clusters.

For any R and d, the reuse distance of the virtual cell is:

${\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Int</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, Int(·) means rounding up, R is the distance between two adjacent base stations, and d is the side length of the virtual cell. Each virtual cell cluster consists of (d _r /d) ² virtual cells, and a total of (d _r /d) ² virtual cell addresses is required, that is, the number of virtual cell addresses in each virtual cell cluster: $\left|A_{\mathrm{cell}}\right|={\left(\frac{d_r}{d}\right)}^2---\left(3\right)$ Therefore, the number of bits required for each virtual small cluster address field is:

b=Int(log ₂ |A _cell |)(4)

Wherein Int(·) represents rounding up, and the number of elements in the address space |Ω|=2 ^b .

Assuming that each virtual cell contains a base station, the corresponding initial standby address set is:

A _spare ＝Ω-A _cell (5)

The set of spare addresses will be reserved for the resolution of address conflicts and the introduction of new radio cells.

即备用地址集为空集。这时地址域需要增加一个比特以留出备用，故在本发明中虚拟小区地址长度为：According to formula (5), when log ₂ |A _cell | in formula (4) is an integer, the address space |Ω|=2 ^b = |A _cell |, so

That is, the standby address set is an empty set. At this time, the address domain needs to increase one bit to reserve, so in the present invention, the address length of the virtual cell is:

$\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; =</span>\left\{\begin{array}{cc}\mathrm{<span\; class="notranslate">\; Int</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; )</span>& {\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&NotElement;</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="0"\; label="N"\; filenames="H2009102192166E00031.png,H2009102192166E00041.png"\; state="\{\{state\}\}">N</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\\ \mathrm{<span\; class="notranslate">\; Int</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}& {\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="log"\; filenames="H2009102192166E00041.png"\; state="\{\{state\}\}">log</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&Element;</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Among them, N ₀ is a set of natural numbers, and Int(·) represents rounding up.

Step 3, according to the location coordinates of the base station, map the virtual cell to which the base station belongs, and use the virtual cell address as the intra-cluster identification segment of the physical cell ID of the cell under the premise of no conflict.

The premise of no conflict means that in the same virtual cell cluster, different cellular cells should use different identification segments within the physical cell ID cluster.

Let the position coordinates (x, y) of the base station eNB be assumed. In the present invention, the address of the virtual cell starts from the origin of the coordinates and is allocated and spatially multiplexed in the order from the bottom left to the top right, and the following mapping relationship from the coordinates of the base station to the address of the virtual cell is established:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; int</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; mod</span>}\mathrm{<span\; class="notranslate">\; a</span>}\\ {\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="H2009102192166E00041.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; [</span>\mathrm{<span\; class="notranslate">\; int</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; mod</span>}\mathrm{<span\; class="notranslate">\; a</span>}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; addr</span>}}<span\; class="notranslate">\; =</span>\left\{\begin{array}{cc}\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="H2009102192166E00041.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&le;</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="H2009102192166E00041.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}& {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ></span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>$

Here, a=d _r /d, int(·) means rounding down, mod means remainder operation, A _addr is the address of the virtual cell to which the base station is mapped, and _x1 and _y1 are intermediate variables.

Thus, the base station can directly obtain the address of the virtual cell where it is located only through function mapping according to its own position coordinates (x, y). On the premise of no address conflict, the address of the virtual cell is used as the identification segment within the cluster of the physical cell ID of the wireless cell.

Step 4, each base station reports its used virtual cell address to OAM, and OAM summarizes the reported information to determine the used address set A _eNB ; remove the used address set A _eNB from the address space Ω to obtain the initial standby address Set A _spare .

Step 5, performing conflict resolution on the wireless cells where the physical cell ID conflict occurs.

When two or more base stations fall into the same virtual cell, after address mapping, several base stations in the same virtual cell will get the same virtual cell address. When it detects that the physical cell ID used by itself has been preemptively used by other base stations, the base station requests the OAM to send a backup address set, and the OAM sends the backup address set to the base station, and the base station selects a new one from the backup address set by random selection. The address of the virtual cell is used as the identification segment in the ID cluster of the physical cell, and is reported to the OAM; the OAM updates the standby address set.

The update of the spare address set A _spare is performed as follows:

If the base station selects and consumes a virtual cell address from the backup address set for conflict resolution or a newly introduced cell, the base station reports to the OAM, and the OAM deletes the address from the backup address set according to the report information;

If a virtual cell address used by the base station is released, the base station reports to the OAM, and the OAM adds the address to the standby address set according to the report information.

2. Allocation of identification segments between physical cell ID clusters

In the intra-cluster identification segment configuration process, after step 2 is completed, the inter-cluster identification segments can be allocated. OAM divides the distribution area of base stations in units of virtual cell clusters, and each virtual cell cluster is assigned a number by OAM as the inter-cluster identification segment of the physical cell ID of each wireless cell in the virtual cell cluster, and the length of the inter-cluster identification segment is the physical cell The total ID length minus the configured intra-cluster identification segment length b bits. The configuration of the inter-cluster identification segment is based on the distance between cell clusters, ensuring that virtual cell clusters using the same inter-cluster identification segment have a larger distance.

For the situation where a new cell is introduced into an existing network, the configuration of the identification segment in the cluster is carried out as follows: the base station first detects whether the virtual cell address of the virtual cell to which it belongs has been used, and if not, then the virtual cell The cell address is used as the intra-cluster identification segment of the cell; if it has already been used, the base station selects a new virtual cell address from the standby address set in a random selection manner as the intra-cluster identification segment of the physical cell ID. After the base station completes the configuration of the identification segment in the ID cluster of the physical cell, it reports to the OAM; the OAM updates the standby address set.

For the situation where any virtual cell cluster spare addresses are exhausted, continue to introduce new wireless cells, only need to re-run the configuration steps of the cluster identification segment in the virtual cell cluster according to the new network scale, increase The length of the intra-cluster identification segment of the physical cell ID in the virtual cell cluster is configured with a new intra-cluster identification segment of the physical cell ID; the OAM configures a new inter-cluster identification segment for the virtual cell cluster.

Terminology Explanation

PCI: Physical Cell Identity, physical cell ID;

LTE: Long Term Evolution, long-term evolution;

eNB: Evolved Node B, evolved Node B, which is the base station in the LTE system;

OAM: Operation and Maintenance, operation and maintenance.

Claims (6)

1. the self-configuration method of physical district ID in the LTE Cellular Networks is characterized in that, according to network size and spatial multiplexing principle, physical district ID is divided in the virtual subdistrict bunch bunch identification section two parts between identification section and virtual subdistrict bunch bunch, is configured respectively:

A. bunch the configuration step of identification section in

(A1) base station is the square virtual subdistrict of close proximity with the base station distribution area dividing through making up virtual grid;

(A2) according to the principle of reusable not of virtual subdistrict address in the double bounce scope, confirm multiplex distance d _rWith address space Ω, distribute the unique numbering in part as the virtual subdistrict address according to the principle of space division multiplexing for each virtual subdistrict,

Described part is unique, is in the double bounce scope, and different virtual subdistricts is distributed different virtual subdistrict addresses, and this double bounce scope is meant with the cellular base stations to be the center of circle, and radius is the zone of 2R, and R is the spacing of adjacent two base stations,

Described virtual subdistrict address is to begin according to multiplexing down to the upper right order assignment row space of going forward side by side from a left side from the origin of coordinates;

(A3) according to the position coordinates of base station, mapping obtains the virtual subdistrict under this base station, under conflict free prerequisite, with the virtual subdistrict address as the physical district ID of cellular cell bunch in identification section;

(A4) each base station to OAM report oneself use the virtual subdistrict address, OAM is according to the definite address set A of having used of these report informations _ENB, from address space Ω, remove and used the address set A _ENB, obtain initial standby address collection A _Spare

(A5) when detecting the physical district ID conflict; Change the base station of physical district ID and send the standby address collection to the OAM request; OAM sends the standby address collection to this base station; This base station is adopted the mode of selecting at random to concentrate from standby address and is chosen a new virtual subdistrict address, as identification section in the physical district ID bunch, and reports to OAM; OAM upgrades the standby address collection;

B. bunch the configuration step of identification section between

In step (A2) afterwards, OAM bunch is that unit divides with the base station distribution zone with virtual subdistrict, and OAM be each virtual subdistrict bunch numbering of distribution, as each physical district ID in the virtual subdistrict bunch bunch between identification section; Between bunch the length of identification section for the physical district ID total length deduct bunch in the length of identification section.

2. self-configuration method according to claim 1, the configuration of identification section in wherein said bunch, in the network of having runed new introduce a cellular cell bunch in the configuration of identification section be from step (A3) beginning, by the end of step (A5).

3. self-configuration method according to claim 1; For any situation that virtual subdistrict bunch standby address is used up; If continue to introduce new radio honeycomb sub-district, only need be according to new network size, in this virtual subdistrict bunch, rerun the configuration step of identification section in described bunch; Increase the length of identification section in the physical district ID in this virtual subdistrict bunch bunch, dispose new physical district ID bunch in identification section; By OAM be this virtual subdistrict bunch configuration new bunch between identification section.

4. self-configuration method according to claim 1, the described conflict free prerequisite of step (A3) wherein is meant in same virtual subdistrict bunch, different cellular cells should use identification section in the different physical district ID bunch.

5. self-configuration method according to claim 1, wherein the described address set A eNB that used of step (A4) is to report the virtual subdistrict address of oneself selecting for use by each base station to OAM, is gathered definite by OAM.

6. self-configuration method according to claim 1, the wherein renewal of (A5) described standby address collection Aspare, carry out as follows:

(6A) consumed a virtual subdistrict address if the base station concentrates to select for use from standby address for the perhaps new cellular cell of introducing of conflict decomposition, the base station reports that to OAM OAM deletes this address from standby address is concentrated;

(6B) if certain virtual subdistrict address that use the base station is released, the base station reports that to OAM OAM adds this address to the standby address collection.

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