Method, device and storage medium for adjusting physical cell identification conflicts

Abstract

The embodiment of the present application discloses a method for adjusting physical cell identifier conflicts and related equipment, which can avoid interference caused by PCI conflicts. The method includes: obtaining wireless channel information fed back by a target terminal, the wireless channel information including the SINR of a reference signal; if the SINR is lower than a first preset value, obtaining the utilization rate of the physical resource blocks of the cells in the target area; if there is a target cell set in the target area whose utilization rate of the physical resource blocks is lower than a second preset value, determining a first cell subset and a second cell subset, the first cell subset being a cell set in the target cell set whose utilization rate of the physical resource blocks is lower than a third preset value, and the second cell subset being a cell set in the target cell set whose utilization rate of the physical resource blocks is higher than the third preset value and lower than the second preset value; merging the cells in the first cell subset; and adjusting the transmit power of the resource blocks in each cell in the second cell subset.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a method, device, and storage medium for adjusting physical cell identifier conflicts. Background Art

[0002] The Physical Cell ID (PCI) is used to help the terminal device distinguish the wireless signals of different cells during the cell search process. The terminal device cannot receive the same PCI in the wireless signals of multiple cells, otherwise interference will be caused. PCI is mainly used to distinguish different cells between mobile phones and wireless access networks. The purpose of PCI planning is to allocate a PCI to each cell in the 4th generation mobile communication technology (4G) and 5th generation mobile communication technology (5G) networking, reuse a limited number of PCIs as much as possible, and avoid interference between the same PCIs due to the PCI reuse distance being too small.

[0003] 4G networks don't have a regular cloverleaf cellular structure. In particular, some areas utilize six-sector networking to increase capacity. Therefore, adjacent cells inevitably have the same PCI modulo 3, causing co-channel interference. According to the topological four-color principle, irregular patterns require at least four colors to ensure that sub-regions with the same boundaries have different colors. Similarly, due to the non-ideal cellular structure of existing networks, the six-sector networking of Long Term Evolution (LTE) systems, and the ultra-dense networking of 5G NR systems, modulo 3 PCI conflicts between adjacent cells are inevitable, as well as interference caused by a very small reuse distance.

[0004] Current strategies for addressing PCI conflicts include optimizing PCI planning and engineering measures. Local optimization of PCI planning will inevitably affect the PCI allocation of surrounding cells, causing a chain reaction and leading to repeated PCI conflicts. Engineering measures will inevitably affect network quality. Summary of the Invention

[0005] The embodiments of the present application provide a method, device, and storage medium for adjusting physical cell identifier conflicts, which can adjust interference caused by PCI conflicts and avoid the impact of PCI conflicts on network quality.

[0006] A first aspect of the present application provides a method for adjusting physical cell identifier conflicts, which may include:

[0007] Acquire wireless channel information fed back by the target terminal, wherein the wireless channel information includes a signal to interference plus noise ratio (SINR) of a reference signal corresponding to the target terminal;

[0008] If the SINR of the reference signal corresponding to the target terminal is lower than the first preset value, obtaining a utilization rate of a physical resource block of each cell in a target area, where the target area is an area where the target terminal is located;

[0009] If there is a target cell set in the target area whose utilization rate of the physical resource blocks is less than a second preset value, determining a first cell subset and a second cell subset according to the utilization rate of the physical resource blocks of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is less than a third preset value, and the second cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is greater than the third preset value and less than the second preset value;

[0010] merging cells in the first cell subset;

[0011] The transmit power of the resource blocks in each cell in the second cell subset is adjusted.

[0012] In one possible design, the merging of cells in the first cell subset includes:

[0013] Determining an SINR value for each cell in the first cell subset;

[0014] Selecting K cells from the first cell subset according to the SINR value of each cell, wherein the value of K is associated with the number of cells in the target area;

[0015] Merging the target cell into a cell with the greatest interference with the target cell among the K cells according to an SINR value of the first target cell, where the first target cell is any one of all cells in the first cell subset except the K cells;

[0016] All cells except the K cells in the first cell subset are traversed until all cells except the K cells in the first cell subset are merged.

[0017] In one possible design, adjusting the transmit power of a resource block in each cell in the second cell subset includes:

[0018] determining a first number of resource blocks within a system carrier bandwidth;

[0019] Determine a cell edge rate requirement corresponding to a cell edge of a second target cell, where the second target cell is any cell in the second cell subset;

[0020] Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell;

[0021] Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval;

[0022] Obtaining the total downlink power of the cell corresponding to the second target cell;

[0023] Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first number, and the second number;

[0024] Adjust the first transmit power and the second transmit power.

[0025] In one possible design, the adjusting the first transmit power and the second transmit power includes:

[0026] determining a difference between the first transmit power and the second transmit power;

[0027] The first transmit power and the second transmit power are adjusted according to the difference.

[0028] In one possible design, determining a difference between the first transmit power and the second transmit power includes:

[0029] The difference between the first reflected power and the second transmitted power is determined by the following formula:

[0030]

[0031] in, is the difference between the first transmit power and the second transmit power, is the first transmission power, is the second transmit power;

[0032] The adjusting unit adjusting the first transmit power and the second transmit power according to the difference includes:

[0033] The difference is increased according to a preset step size until the SINR value of the second target cell is greater than the first preset value.

[0034] In one possible design, the method further includes:

[0035] If the SINR values ​​of the cells in the target area change, dynamically adjusting the cells included in the first cell subset and the second cell subset;

[0036] merging cells in the first cell subset after dynamic adjustment;

[0037] The dynamically adjusted transmit power of the resource blocks in each cell in the second cell subset is adjusted.

[0038] A second aspect of the present application provides a physical cell identifier conflict adjustment device, including:

[0039] an acquiring unit, configured to acquire wireless channel information fed back by a target terminal, wherein the wireless channel information includes a signal to interference plus noise ratio (SINR) of a reference signal corresponding to the target terminal;

[0040] The acquiring unit is further configured to acquire, if the SINR of the reference signal corresponding to the target terminal is lower than the first preset value, a utilization rate of the physical resource blocks of each cell in a target area, where the target area is an area where the target terminal is located;

[0041] a determining unit, configured to, if there is a target cell set in the target area whose utilization rate of physical resource blocks is less than a second preset value, determine a first cell subset and a second cell subset according to the utilization rate of physical resource blocks of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set whose utilization rate of physical resource blocks is less than a third preset value, and the second cell subset is a cell set in the target cell set whose utilization rate of physical resource blocks is greater than the third preset value and less than the second preset value;

[0042] a merging unit, configured to merge cells in the first cell subset;

[0043] An adjustment unit is used to adjust the transmission power of the resource blocks in each cell in the second cell subset.

[0044] In one possible design, the merging unit is specifically used to:

[0045] Determining an SINR value for each cell in the first cell subset;

[0046] Selecting K cells from the first cell subset according to the SINR value of each cell, wherein the value of K is associated with the number of cells in the target area;

[0047] Merging the target cell into a cell with the greatest interference with the target cell among the K cells according to an SINR value of the first target cell, where the first target cell is any one of all cells in the first cell subset except the K cells;

[0048] All cells except the K cells in the first cell subset are traversed until all cells except the K cells in the first cell subset are merged.

[0049] In one possible design, the adjustment unit is specifically used to:

[0050] determining a first number of resource blocks within a system carrier bandwidth;

[0051] Determine a cell edge rate requirement corresponding to a cell edge of a second target cell, where the second target cell is any cell in the second cell subset;

[0052] Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell;

[0053] Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval;

[0054] Obtaining the total downlink power of the cell corresponding to the second target cell;

[0055] Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first number, and the second number;

[0056] Adjust the first transmit power and the second transmit power.

[0057] In one possible design, the adjusting unit adjusting the first transmit power and the second transmit power includes:

[0058] determining a difference between the first transmit power and the second transmit power;

[0059] The first transmit power and the second transmit power are adjusted according to the difference.

[0060] In one possible design, the adjusting unit determining the difference between the first transmit power and the second transmit power includes:

[0061] The difference between the first reflected power and the second transmitted power is determined by the following formula:

[0062]

[0063] in, is the difference between the first transmit power and the second transmit power, is the first transmission power, is the second transmit power;

[0064] The adjusting unit adjusting the first transmit power and the second transmit power according to the difference includes:

[0065] The difference is increased according to a preset step size until the SINR value of the second target cell is greater than the first preset value.

[0066] In one possible design, the device further includes:

[0067] A dynamic update unit, wherein the dynamic update unit is configured to:

[0068] If the SINR values ​​of the cells in the target area change, dynamically adjusting the cells included in the first cell subset and the second cell subset;

[0069] merging cells in the first cell subset after dynamic adjustment;

[0070] The dynamically adjusted transmit power of the resource blocks in each cell in the second cell subset is adjusted.

[0071] A third aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores at least one executable instruction. When the executable instruction is executed on a computing device, the computing device executes the method for adjusting physical cell identifier conflicts as described in the first aspect of the present application.

[0072] The fourth aspect of the present application discloses a computer program product. When the computer program product is run on a computer, the computer is caused to execute the method for adjusting physical cell identifier conflicts described in the first aspect of the present application.

[0073] In a fifth aspect, the present application discloses an application publishing platform, which is used to publish a computer program product. When the computer program product runs on a computer, the computer executes the method for adjusting the physical cell identifier conflict described in the first aspect of the present application.

[0074] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0075] In the embodiment provided by the present application, it is possible to determine whether the interference within a cell is caused by a PCI conflict based on the SINR value of the cell within the target area. When there is a cell set in the target area where the interference is caused by a PCI conflict, the load conditions of each cell in the cell set are further determined, and the cell set is divided according to the load conditions. If the load condition is high, the PCI conflict is avoided by adjusting the transmission power of the resource block within the cell. If the load condition is low, the PCI conflict is avoided by merging the cells in the cell set. This can reasonably avoid the interference caused by the PCI conflict and improve the network quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present application. In addition, the same reference symbols are used to represent the same components throughout the drawings. In the drawings:

[0077] Figure 1 Schematic diagram of the flow of the method for adjusting physical cell identifier conflicts in an embodiment of the present application;

[0078] Figure 2 This is a virtual structural diagram of the physical cell identifier conflict adjustment device in an embodiment of the present application;

[0079] Figure 3 This is a schematic diagram of the structure of the server in the embodiment of the present application. DETAILED DESCRIPTION

[0080] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All embodiments in the present invention should fall within the scope of protection of the present invention.

[0081] First, the definition of PCI is explained as follows:

[0082]

[0083] in, is the ID of the cell group, corresponding to the Secondary Synchronization Signa (SSS), It is the intra-group ID of the cell, corresponding to three primary synchronization signals (PSS).

[0084] For 4G LTE systems,

[0085] For the 5G NR system,

[0086] The following descriptions are based on the 4G LTE system and the 5G NR system respectively:

[0087] In 4G LTE systems, user equipment (UE) uses cell-specific reference signals (CRS) to perform cell searches, achieve time and frequency synchronization, and then read system messages to complete cell residency. Furthermore, CRS can also be used by the UE to obtain channel state information (CSI) and perform cell-specific measurements such as reference signal received power (RSRP) to determine cell selection and handover.

[0088] The starting position of the Reference Signal (RS) within each Resource Block (RB) is related to the cell-specific frequency offset. For two antenna ports, the LTE system defines three frequency offsets, which are related to the cell's PCI and have values ​​of PCI MOD 3 = {0, 1, 2}. In co-frequency networking, frequency offsets can prevent time-frequency resource conflicts between cell-specific RS signals of up to three adjacent cells.

[0089] In co-frequency networking, cells with the same PCI have identical RS sequences and positions, resulting in interference between the RSs. In 2x2 MIMO, cells with different PCIs, if the PCI modulo 3 of two cells is the same, will have the RS positions identical between the two cells. This will cause interference between the RSs, leading to a sharp drop in the Signal to Interference plus Noise Ratio (SINR), thus impacting cell throughput. Furthermore, 4G networks do not have a regular cloverleaf cellular structure. In particular, some areas use a six-sector network to increase capacity. Therefore, adjacent cells will inevitably have the same PCI modulo 3, causing co-channel interference.

[0090] The downlink synchronization of 5G NR is similar to that of LTE, but 5G NR does not have CRS. Instead, it adds a demodulation reference signal (DMRS), whose frequency domain position on the SS / PBCH block is determined by PCI mode 4.

[0091] Compared to 4G LTE systems, 5G NR systems have the following changes in PCI planning: The number of PCIs has increased from 504 to 1008, reducing the probability of PCI conflicts. This is consistent with the smaller cell coverage area and the larger reuse distance required for PCIs in 5G NR. Because the DMRS of the Physical Broadcast Channel (PBCH) has four frequency offsets, 5G NR must avoid both PCI mode-3 and PCI mode-4 conflicts.

[0092] It should also be noted that PCI conflict avoidance requires that not only adjacent cells cannot have the same PCI, but also PCI mode 3, mode 30, mode 4 (5G NR system), etc. cannot be the same.

[0093] There are two conditions for PCI conflicts:

[0094] Condition 1: The wireless signal strengths received by the terminal device in different cells are comparable.

[0095] Condition 2: The wireless signal frequencies received by the terminal device from different cells are the same.

[0096] If both conditions are met, it will cause serious interference, affecting the access of terminal equipment and network quality.

[0097] In 4G / 5G systems, terminal devices cannot distinguish between interference caused by PCI conflicts and interference from traffic channels. Therefore, when the RS-SINR value decreases, the base station will use a lower bit rate for data transmission, resulting in a decrease in cell throughput. Therefore, it is necessary to first identify the interference caused by PCI conflicts and implement targeted treatment to avoid unnecessary loss of cell throughput due to interference.

[0098] Condition 1 shows that PCI conflicts primarily occur at cell boundaries. Within a cell, near the antenna, the signal strength of the cell itself is strong, while that of adjacent cells is weak, so interference generally does not occur. Cell merging, which moves the cell boundary into the cell interior, can resolve PCI conflicts. Cell merging uses the same frequency within multiple cells without frequency reuse. Multiple antennas transmitting the same signal at the same frequency significantly increase diversity gain, thereby reducing interference, enhancing coverage, and improving coverage quality for edge users.

[0099] Condition 2 shows that if the radio signal frequencies of different cells differ at cell boundaries, interference caused by PCI conflicts can be avoided. However, 4G / 5G systems are broadband systems that use co-frequency networking, so the radio signal frequencies at cell boundaries are the same. To implement inter-frequency networking at cell boundaries, different power levels must be allocated to the RBs within the cell carriers to isolate co-frequency signals in the airspace.

[0100] The following describes in detail the method for adjusting physical cell identifier conflicts provided in this application from the perspective of a physical cell identifier conflict adjustment device.

[0101] See also Figure 1 , Figure 1 A schematic diagram of an embodiment of a method for adjusting a physical cell identifier conflict provided in an embodiment of the present application includes:

[0102] 101. Obtain wireless channel information fed back by a target terminal.

[0103] In this embodiment, the physical cell identifier conflict adjustment device can obtain the wireless channel information fed back by the target terminal, wherein the wireless channel information includes the signal to interference plus noise ratio (SINR) of the reference signal corresponding to the target terminal. In addition, the wireless channel information can also include RSRP information of the reference signal. Specifically, the physical cell identifier conflict adjustment device can send an acquisition instruction to the target terminal in the target area. After receiving the acquisition instruction, the target terminal feeds back the corresponding wireless channel information to the physical cell identifier conflict adjustment device. Of course, other methods can also be adopted, such as the target terminal periodically feeding back wireless channel information, which is not specifically limited.

[0104] 102. If the SINR value of the reference signal corresponding to the target terminal is lower than a first preset value, obtain a utilization rate of a physical resource block of each cell in the target area.

[0105] In this embodiment, after obtaining the wireless channel information fed back by the target terminal, the physical cell identifier conflict adjustment device can determine whether the SINR included in the wireless channel information is a first preset value. If the SINR of the reference signal corresponding to the target terminal is lower than the first preset value, the load information of each cell in the target area is obtained. The load information is the utilization rate of the physical resource block (PRB) of each cell, which can be specifically obtained through interaction between the base station and the gateway. That is, a threshold value can be set in advance, and the SINR fed back by the terminal is compared with the threshold value to determine whether the utilization rate of the physical resource blocks of the cells in the target area is obtained.

[0106] 103. If there is a target cell set in the target area whose utilization rate of physical resource blocks is less than a second preset value, determine a first cell subset and a second cell subset according to the utilization rate of the physical resource blocks of each cell in the target cell set.

[0107] In this embodiment, after obtaining the utilization rate of the physical resource blocks of each cell in the target area, the physical cell identifier conflict adjustment device can determine whether there is a target cell set in the target area whose utilization rate of the physical resource blocks is less than the second preset value. If the utilization rate of the physical resource blocks of each cell in the target area is greater than the second preset value, it can be determined that the interference between the cells in the target area is mainly caused by the service channel; if there is a cell set in the target area whose utilization rate of the physical resource blocks is less than the second preset value, it can be determined that the interference between the cells in the cell set in the target area whose utilization rate of the physical resource blocks is less than the second preset value is interference caused by PCI conflict. The physical cell identifier conflict adjustment device can determine the first cell subset and the second cell subset based on the utilization rate of the physical resource blocks of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is less than the third preset value, and the second cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is greater than the third preset value and less than the second preset value. That is, the physical cell identifier conflict adjustment device can divide the cells in the target cell set into two subsets according to the utilization rate of the physical resource blocks of each cell in the target cell set, wherein the utilization rate of each physical resource block in one cell subset is less than the third preset value, and the utilization rate of each physical resource block in the other cell subset is greater than the third preset value and less than the second preset value.

[0108] It should be noted that the second preset value is generally 50% of the utilization rate of the physical resource blocks of each cell in the target area. Of course, it can also be set according to actual conditions. In addition, in the target area, there will generally be some cells whose utilization rate of the physical resource blocks is greater than the second preset value, and some cells whose utilization rate is less than the second preset value. Among the cells whose utilization rate is less than the second preset value, there will also be some cells whose utilization rate of the physical resource blocks is less than the second preset value and greater than the third preset value, and some cells whose utilization rate of the physical resource blocks is less than the third preset value.

[0109] 104. Merge cells in the first cell subset.

[0110] In this embodiment, the physical cell identifier conflict adjustment device can merge cells in the first cell subset. Cell merging refers to merging the coverage areas of multiple remote radio units (RRUs) into a single logical cell. This allows reference signals within a single logical cell to be transmitted and received by multiple RRUs. Downlink signal retransmission and uplink diversity reception can be achieved between RRUs within the logical cell, improving signal quality. This converts inter-cell interference signals into useful signals within the cell, thereby avoiding interference and improving performance for edge users.

[0111] In one embodiment, the physical cell identifier conflict adjustment device merging cells in the first cell subset includes:

[0112] Determining an SINR value for each cell in the first cell subset;

[0113] Selecting K cells from the first cell subset based on the SINR value of each cell, where the value of K is correlated with the number of cells in the target area;

[0114] Merge the target cell into the cell with the greatest interference with the target cell among the K cells according to the SINR value of the first target cell, where the first target cell is any cell among all cells in the first cell subset except the K cells;

[0115] All cells except K cells in the first cell subset are traversed until all cells except K cells in the first cell subset are merged.

[0116] In this embodiment, the physical cell identifier conflict adjustment device merges cells by clustering. Specifically, the SINR value of each cell in the first cell subset can be determined, and K cells are selected from the first cell subset as K initial value points based on the SINR value of each cell. The purpose of selecting the initial value points is to simplify the complexity of clustering. The initial value points can select the cell with the largest interference, and at the same time combine the user's aggregation characteristics. The user's aggregation characteristics refer to the user's mobility. If the user moves frequently, inter-cell handover may cause the user to drop calls / disconnect. In the existing network, there are also location area code (LAC) areas, routing areas, tracking areas, etc. The cluster boundaries can coincide with the cell boundaries to avoid the impact of excessive and concentrated location updates on network performance.

[0117] After selecting K initial points, the target cell can be merged into the cell with the greatest interference with the target cell within the K cells based on the SINR value of the first target cell. The first target cell is any cell in the first cell subset except the K cells. Specifically, using the K initial points as cluster heads, all cells in the first cell subset except the K initial points are traversed, and the cells are merged into the cluster with the cluster head with the greatest interference with the cell and marked. This process is repeated until all cells in the first cell subset except the K initial points have been traversed. This ensures that after clustering, interference between logical cells is low, effectively protecting the performance of cell-edge users. Cell merging improves user service quality at the expense of frequency reuse. Cell merging reduces network capacity, so avoiding PCI conflicts using cell merging is only feasible when cell load is low (the load of the current cell and neighboring cells is less than 30%).

[0118] It's important to note that the number of initial points should not be too small to prevent clusters from becoming too large, which in turn prevents a significant impact on network capacity when cells are merged later. The ratio of K to the number of cells N in the target area is generally between 0.6 and 0.8. This ratio is related to network capacity requirements and can be adjusted based on actual conditions. There is no specific limit.

[0119] 105. Adjust the transmit power of the resource blocks in each cell in the second cell subset.

[0120] In this embodiment, if the load of the current cell and the adjacent cell is high, that is, the utilization rate of the physical resource block is high, the PCI conflict cannot be avoided by cell merging, but it is necessary to use spatial coverage isolation to avoid the PCI conflict, that is, the physical cell identifier conflict adjustment device can adjust the transmission power of the resource block in each cell in the second cell subset to avoid the PCI conflict.

[0121] In one embodiment, the physical cell identifier conflict adjustment device adjusts the transmit power of the resource block in each cell in the second cell subset, including:

[0122] determining a first number of resource blocks within a system carrier bandwidth;

[0123] Determine the cell edge rate requirement corresponding to the cell edge of the second target cell, where the second target cell is any cell in the second cell subset.

[0124] Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell;

[0125] Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval;

[0126] Obtaining the total downlink power of the cell corresponding to the second target cell;

[0127] Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first quantity, and the second quantity;

[0128] The first transmit power and the second transmit power are adjusted.

[0129] In this embodiment, it is assumed that the first number of resource blocks (RBs) within the system carrier bandwidth is N, and the set of all RBs is denoted as F. A At the cell edge of the second target cell (the second target cell is any cell in the second cell subset), the RB frequency reuse used is M, and M can be {2, 3, 4}. According to the topological four-color principle, when the frequency reuse is 4, even in an irregular cellular structure, the frequencies of RBs at the edges of adjacent cells can be guaranteed to be different, thereby avoiding PCI conflicts.

[0130] The RB set used by the cell edge of the second target cell is recorded as e i (1≤i≤M), and the RB sets used by the edges of adjacent cells meet the following conditions:

[0131] e i ∩e j =φ(1≤i≤M, 1≤j≤M, i≠j).

[0132] RB set e used by the second target cell i Contains n i RBs, then the following should be satisfied:

[0133] Among them, n i The value of n is determined by the cell edge rate requirement of the second target cell. i For example, the number of PRBs can be obtained by looking up the table of the 4G LTE system specification according to the number of cell edges of the second cell. The number of PRBs is n. i .

[0134] Assume that the total downlink power of the second target cell is P, and the RB set e used at the cell edge of the second target cell is i Each RB in the Transmit, the RB set used at the cell center of the second target cell (F A -e i ) in each RB with power Emission, the following relationship exists:

[0135] Among them, 1≤i≤M;

[0136] To avoid affecting the cell capacity, the coverage of the cell-edge RBs and the cell-center RBs of the second target cell cannot differ too much. Generally, the coverage difference between the cell-edge RBs and the cell-center RBs should be between 5% and 20%. Therefore, the difference between the first transmit power of the cell-edge RBs and the second transmit power of the cell-center RBs is:

[0137]

[0138] in, is the difference between the first transmit power and the second transmit power, is the first transmission power, is the second transmission power; The value range can be [0dB, 3dB], and the initial value is 0dB.

[0139] If the interference caused by the PCI conflict is unacceptable, that is, if the SINR value of the second target cell is lower than the second preset value, the difference between the cell edge RB and the cell center RB in the second target cell is increased according to the preset step size until the SINR value of the second target cell is greater than the first preset value. The first reflected power and the second transmitted power are increased in steps of 0.5 dB, thereby adjusting the first reflected power and the second transmitted power until the interference caused by the PCI conflict meets the requirement.

[0140] It should be noted that during the network construction process, new base stations will continue to be added. After the new base stations are added, the network structure changes and the interference between cells will also change. That is, if the SINR value of the cells in the target area changes, the cells included in the first cell subset and the second cell subset are dynamically adjusted according to the SINR value, and the cells in the dynamically adjusted first cell subset are merged, and the transmission power of the resource blocks in each cell in the dynamically adjusted second cell subset is adjusted at the same time. The above has already described in detail the merging of cells and the adjustment of resource block transmission power, and will not be repeated here.

[0141] It should also be noted that, through step 104, the cells in the first cell subset can be merged, and through step 105, the transmission power of the resource block of each cell in the second cell subset can be adjusted. However, there is no restriction on the order of execution between these two steps. Step 104 can be executed first, or step 105 can be executed first, or they can be executed simultaneously, without specific limitation.

[0142] To sum up, it can be seen that in the embodiments provided by the present application, it is possible to determine whether the interference within a cell is caused by a PCI conflict based on the SINR value of the cell in the target area, and when there is a cell set in the target area where the interference is caused by a PCI conflict, the load conditions of each cell in the cell set are further determined, and the cell set is divided according to the load conditions. If the load condition is high, the PCI conflict is avoided by adjusting the transmission power of the resource block in the cell. If the load condition is low, the PCI conflict is avoided by merging the cells in the cell set. This can reasonably avoid the interference caused by the PCI conflict and improve the network quality.

[0143] The above describes the embodiment of the present application from the perspective of the method for adjusting the physical cell identifier conflict. The following describes the embodiment of the present application from the perspective of the physical cell identifier conflict adjustment device:

[0144] See also Figure 2 , Figure 2 This is a schematic diagram of an embodiment of a physical cell identifier conflict adjustment device provided in an embodiment of the present application. The physical cell identifier conflict adjustment device 200 includes:

[0145] An acquiring unit 201 is configured to acquire wireless channel information fed back by a target terminal, wherein the wireless channel information includes a signal to interference plus noise ratio (SINR) of a reference signal corresponding to the target terminal;

[0146] The acquiring unit 201 is further configured to acquire, if the SINR of the reference signal corresponding to the target terminal is lower than the first preset value, a utilization rate of the physical resource blocks of each cell in a target area, where the target area is an area where the target terminal is located;

[0147] a determining unit 202 configured to, if a target cell set having a physical resource block utilization rate less than a second preset value exists in the target area, determine a first cell subset and a second cell subset based on the physical resource block utilization rate of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set having a physical resource block utilization rate less than a third preset value, and the second cell subset is a cell set in the target cell set having a physical resource block utilization rate greater than the third preset value and less than the second preset value;

[0148] a merging unit 203, configured to merge cells in the first cell subset;

[0149] The adjusting unit 204 is configured to adjust the transmit power of the resource blocks in each cell in the second cell subset.

[0150] In one possible design, the merging unit 203 is specifically configured to:

[0151] Determining an SINR value for each cell in the first cell subset;

[0152] Selecting K cells from the first cell subset according to the SINR value of each cell, wherein the value of K is associated with the number of cells in the target area;

[0153] Merging the target cell into a cell with the greatest interference with the target cell among the K cells according to an SINR value of the first target cell, where the first target cell is any one of all cells in the first cell subset except the K cells;

[0154] All cells except the K cells in the first cell subset are traversed until all cells except the K cells in the first cell subset are merged.

[0155] In one possible design, the adjustment unit 204 is specifically configured to:

[0156] determining a first number of resource blocks within a system carrier bandwidth;

[0157] Determine a cell edge rate requirement corresponding to a cell edge of a second target cell, where the second target cell is any cell in the second cell subset;

[0158] Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell;

[0159] Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval;

[0160] Obtaining the total downlink power of the cell corresponding to the second target cell;

[0161] Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first number, and the second number;

[0162] Adjust the first transmit power and the second transmit power.

[0163] In one possible design, the adjusting unit 204 adjusts the first transmit power and the second transmit power including:

[0164] determining a difference between the first transmit power and the second transmit power;

[0165] The first transmit power and the second transmit power are adjusted according to the difference.

[0166] In one possible design, the adjusting unit 204 determines the difference between the first transmit power and the second transmit power including:

[0167] The difference between the first reflected power and the second transmitted power is determined by the following formula:

[0168]

[0169] in, is the difference between the first transmit power and the second transmit power, is the first transmission power, is the second transmit power;

[0170] The adjusting unit 204 adjusts the first transmit power and the second transmit power according to the difference, including:

[0171] The difference is increased according to a preset step size until the SINR value of the second target cell is greater than the first preset value.

[0172] In one possible design, the device further includes:

[0173] Dynamic update unit 205, the dynamic update unit 205 is used to:

[0174] If the SINR values ​​of the cells in the target area change, dynamically adjusting the cells included in the first cell subset and the second cell subset;

[0175] merging cells in the first cell subset after dynamic adjustment;

[0176] The dynamically adjusted transmit power of the resource blocks in each cell in the second cell subset is adjusted.

[0177] The embodiment of the present application also provides another physical cell identity conflict adjustment device, which is deployed on a server. Figure 3 , Figure 33 is a structural diagram of a server provided by an embodiment of the present invention. The server 300 may have relatively large differences due to different configurations or performances, and may include one or more central processing units (CPU) 322 (for example, one or more processors) and memory 332, and one or more storage media 330 (for example, one or more mass storage devices) for storing application programs 342 or data 344. Among them, the memory 332 and the storage medium 330 can be temporary storage or permanent storage. The program stored in the storage medium 330 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations on the server. Furthermore, the central processing unit 322 can be configured to communicate with the storage medium 330 to execute a series of instruction operations in the storage medium 330 on the server 300.

[0178] The server 300 may also include one or more power supplies 326, one or more wired or wireless network interfaces 350, one or more input and output interfaces 358, and / or one or more operating systems 341, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, etc.

[0179] The steps performed by the physical cell identifier conflict adjustment device in the above embodiment may be based on the server structure shown in FIG. 3 .

[0180] The present application also provides a computer-readable storage medium, in which at least one executable instruction is stored. When the executable instruction is executed on a computing device, the computing device executes the method for adjusting the physical cell identifier conflict described in any of the above embodiments.

[0181] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0182] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, a computer, a server, or a data center by wired (such as coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, a computer, a server, or a data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integrations. The available medium can be a magnetic medium, (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state drive (SSD)), etc.

[0183] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0184] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0185] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0186] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0187] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0188] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for adjusting physical cell identifier conflicts, characterized in that: include: Acquire wireless channel information fed back by the target terminal, wherein the wireless channel information includes a signal to interference plus noise ratio (SINR) of a reference signal corresponding to the target terminal; If the SINR of the reference signal corresponding to the target terminal is lower than a first preset value, obtaining a utilization rate of a physical resource block of each cell in a target area, where the target area is an area where the target terminal is located; If there is a target cell set in the target area whose utilization rate of the physical resource blocks is less than a second preset value, determining a first cell subset and a second cell subset according to the utilization rate of the physical resource blocks of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is less than a third preset value, and the second cell subset is a cell set in the target cell set whose utilization rate of the physical resource blocks is greater than the third preset value and less than the second preset value; merging cells in the first cell subset; adjusting the transmit power of resource blocks in each cell in the second cell subset; The adjusting the transmit power of the resource blocks in each cell in the second cell subset includes: determining a first number of resource blocks within a system carrier bandwidth; Determine a cell edge rate requirement corresponding to a cell edge of a second target cell, where the second target cell is any cell in the second cell subset; Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell; Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval; Obtaining the total downlink power of the cell corresponding to the second target cell; Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first number, and the second number; determining a difference between the first transmit power and the second transmit power; The difference is increased according to a preset step size until the SINR value of the second target cell is greater than the first preset value.

2. The method according to claim 1, characterized in that The merging of cells in the first cell subset includes: Determining an SINR value for each cell in the first cell subset; Selecting K cells from the first cell subset according to the SINR value of each cell, wherein the value of K is associated with the number of cells in the target area; Merging the target cell into a cell with the greatest interference with the target cell among the K cells according to an SINR value of the first target cell, where the first target cell is any one of all cells in the first cell subset except the K cells; All cells except the K cells in the first cell subset are traversed until all cells except the K cells in the first cell subset are merged.

3. The method according to claim 1, characterized in that The determining a difference between the first transmit power and the second transmit power includes: The difference between the first transmit power and the second transmit power is determined by the following formula: ； in, is the difference between the first transmit power and the second transmit power, is the first transmission power, is the second transmit power.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: If the SINR values ​​of the cells in the target area change, dynamically adjusting the cells included in the first cell subset and the second cell subset; merging cells in the first cell subset after dynamic adjustment; The dynamically adjusted transmit power of the resource blocks in each cell in the second cell subset is adjusted.

5. A physical cell identifier conflict adjustment device, characterized in that: include: an acquiring unit, configured to acquire wireless channel information fed back by a target terminal, wherein the wireless channel information includes a signal to interference plus noise ratio (SINR) of a reference signal corresponding to the target terminal; The acquiring unit is further configured to acquire, if the SINR of the reference signal corresponding to the target terminal is lower than a first preset value, a utilization rate of the physical resource blocks of each cell in a target area, where the target area is an area where the target terminal is located; a determining unit, configured to, if there is a target cell set in the target area whose utilization rate of physical resource blocks is less than a second preset value, determine a first cell subset and a second cell subset according to the utilization rate of physical resource blocks of each cell in the target cell set, wherein the first cell subset is a cell set in the target cell set whose utilization rate of physical resource blocks is less than a third preset value, and the second cell subset is a cell set in the target cell set whose utilization rate of physical resource blocks is greater than the third preset value and less than the second preset value; a merging unit, configured to merge cells in the first cell subset; an adjusting unit, configured to adjust the transmit power of resource blocks in each cell in the second cell subset; The adjusting the transmit power of the resource blocks in each cell in the second cell subset includes: determining a first number of resource blocks within a system carrier bandwidth; Determine a cell edge rate requirement corresponding to a cell edge of a second target cell, where the second target cell is any cell in the second cell subset; Determining a second number of cell-edge resource blocks of the second target cell according to a cell-edge rate requirement corresponding to the cell edge of the second target cell; Determining a third number of cell center resource blocks of the second target cell based on the first number and the second number, wherein a difference between the coverage of the cell center resource blocks of the second target cell and the coverage of the cell edge resource blocks of the second target cell is a preset interval; Obtaining the total downlink power of the cell corresponding to the second target cell; Determine a first transmit power of a cell edge resource block of the second target cell and a second transmit power of a cell center resource block of the second target cell according to the total downlink power of the cell, the first number, and the second number; determining a difference between the first transmit power and the second transmit power; The difference is increased according to a preset step size until the SINR value of the second target cell is greater than the first preset value.

6. The device according to claim 5, characterized in that The merging unit is specifically used for: Determining an SINR value for each cell in the first cell subset; Selecting K cells from the first cell subset according to the SINR value of each cell, wherein the value of K is associated with the number of cells in the target area; Merging the target cell into a cell with the greatest interference with the target cell among the K cells according to an SINR value of the first target cell, where the first target cell is any one of all cells in the first cell subset except the K cells; All cells except the K cells in the first cell subset are traversed until all cells except the K cells in the first cell subset are merged.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one executable instruction, and when the executable instruction is executed on a computing device, the computing device executes the method for adjusting physical cell identifier conflicts according to any one of claims 1 to 4.

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