CN105792374A - Small cell frequency resource allocation method and device - Google Patents

Abstract

The present invention provides a method and device for allocating frequency resources of a small cell, wherein the method includes: when the designated small cell is switched from the closed state to the open state, obtaining the designated information of the neighboring cell corresponding to the designated small cell, wherein the designated The information is used to reflect the interference situation of each neighboring cell to the designated small cell; the frequency resource of the designated small cell is allocated according to the designated information. The present invention solves the problem that when a large number of small cells are deployed in the related art ultra-dense network, the interference between the small cells is very strong, which leads to the decline of the overall performance of the network, improves the resource utilization rate of the small cells, and then improves the overall performance of the network. performance.

Description

Method and device for allocating small cell frequency resources

technical field

The present invention relates to the communication field, in particular, to a small cell frequency resource allocation method and device.

Background technique

Heterogeneous Network (HetNet for short) refers to adding a low-power base station (LowPowerNodeB, LNB for short) to the macrocellular network formed by the original macro station NodeB (MacroNodeB, MNB for short) and service users. The LNB includes: Micro, Pico, and Femto, the network in which users adaptively select access MNB and LNB according to their own location, the power of the signals received from the two base stations and other parameters. Both MNB and LNB can serve as the user's service base station, and because LNB can serve as a supplement to MNB, share the burden of MNB, and fill the coverage blind area of MNB, heterogeneous networks often have higher capacity and better coverage effect. LTE/LTE-AHetNet and HSPAHetNet have experienced relatively mature discussions, and already have many quite mature research results. At present, the ultra-dense network (UltraDenseNetwork, referred to as UDN) in 5G technology is a further enhancement of HetNet.

Ultra-dense network deployment refers to arranging a large number of small cells (micro cells) within the range of macro cells. Usually, the number of small cells can reach the level of hundreds of LNBs within the range of an MNB. UDN will greatly improve the performance of the entire network. Capacity, and because the average transmit power of the base station is greatly reduced, the capacity of each base station is basically the same as that of the previous homogeneous network, so the energy consumption utilization rate in UDN will be greatly improved. At the same time, UDN will also ensure full coverage of the service area, and basically there will be no dead spots in coverage. Based on the above advantages, UDN is identified as one of the key technologies of 5G technology.

However, in UDN, a large number of small cells are deployed in macro cells, and the interference problem between adjacent cells will also be highlighted.

In LTE/LTE-AHetNet and HSPAHetNet, the number of small cells is often several to dozens in each MNB, and the distance between LNBs is relatively large. At this time, due to the limitation of the transmission power of LNBs between adjacent cells, no cause more obvious interference.

However, when a large number of small cells are deployed, there may be hundreds of LNBs in each MNB, and the distance between LNBs will be greatly reduced at this time. At this time, the small cells are basically adjacent to the small cells, and even the boundary between the small cells is squeezed, that is, at the boundary, the downlink pilot signals of multiple LNBs are stronger than the downlink pilot signals of the MNB strength. At this time, if the frequency resources used by each small cell are not properly allocated, the users in the small cell will generate strong uplink interference to adjacent cells, and at the same time, adjacent cells will also cause strong downlink interference to users in this cell. Interference, which will lead to the decline of the overall performance of the network.

Aiming at the problem that when a large number of small cells are deployed in a related art ultra-dense network, the interference between small cells is strong and the overall performance of the network decreases, and no effective solution has been proposed so far.

Contents of the invention

The main purpose of the present invention is to provide a method and device for allocating frequency resources of small cells, so as to at least solve the problem in the related art that when a large number of small cells are deployed in an ultra-dense network, the interference between small cells is strong and the overall performance of the network decreases. .

According to one aspect of the present invention, a method for allocating frequency resources of a small cell is provided, including: when the designated small cell is switched from an off state to an on state, obtaining designation information of a neighboring cell corresponding to the designated small cell, wherein , the designated information is used to reflect the interference situation of each of the neighboring cells to the designated small cell; and the frequency resource of the designated small cell is allocated according to the designated information.

Further, obtaining the designated information of the neighboring cell corresponding to the designated small cell includes: obtaining information indicating the switching state of the neighboring cell; obtaining the designated small cell relative to each of the neighboring cells that are in the open state The RSRP value; obtain the information about the frequency resource occupancy of all the adjacent cells in the open state.

Further, allocating frequency resources of the specified small cell according to the specified information includes: when the frequency resource occupancy information indicates that there are unoccupied frequency resource blocks, using the unoccupied frequency resource blocks as the A first frequency resource of the designated small cell, where the first frequency resource is an exclusive frequency resource of the designated small cell.

Further, allocating frequency resources of the specified small cell according to the specified information includes: when the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, selecting one or more frequency resource blocks with the second frequency resource The neighboring cell is determined as the first target neighboring cell, wherein the second frequency resource is the shared frequency resource of the first target neighboring cell; the RSRP values of all neighboring cells in the first target neighboring cell are higher than a predetermined threshold , sending a first request message to the central control node, wherein the first request message is used to instruct the first target neighbor cell to release the second frequency resource; and receiving a response in response to the first request message message, wherein the response message is used to instruct the central control node to use the second frequency resource as the first frequency resource of the designated small cell; or, part of the first target neighboring cell When the RSRP value of the zone is higher than a predetermined threshold, a second request message is sent to the central control node, wherein the second request message is used to indicate that the designated small cell shares the second frequency with the first target neighbor cell resource.

Further, allocating frequency resources of the specified small cell according to the specified information includes: when the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, and the first target neighboring cell does not have all When using the second frequency resource, select the neighbor cell with the lowest RSRP value from the neighbor cells of the specified small cell as the second target neighbor cell; send a third request message to the central control node, wherein the third request The message is used to request the designated small cell and the second target neighboring cell to share the frequency resource of the second target, and use the frequency resource as the third frequency of the designated small cell and the second target neighboring cell resources, wherein the third frequency resource is a frequency resource exclusively occupied by the designated small cell and the second target neighboring cell.

Further, the method further includes: releasing frequency resources occupied by the designated small cell when the designated small cell changes from an on state to an off state.

According to another aspect of the present invention, there is provided a device for allocating frequency resources of small cells, including: an acquisition module, configured to acquire the neighbors corresponding to the specified small cell when the specified small cell is switched from the closed state to the open state. Area designation information, wherein the designation information is used to reflect the interference of each of the neighboring cells to the designated small cell; an allocation module is configured to allocate frequency resources of the designated small cell according to the designation information.

Further, the obtaining module includes: a first obtaining unit, configured to obtain information indicating the switch state of the neighboring cell; a second obtaining unit, configured to obtain the information of the designated small cell that is in an open state relative to each The RSRP value of the neighboring cell; a third obtaining unit, configured to obtain information on frequency resource occupancy of all the neighboring cells that are in the enabled state.

Further, the allocating module includes: a determining unit, configured to determine the unoccupied frequency resource block as the specified small cell when the frequency resource occupancy information indicates that there is an unoccupied frequency resource block A first frequency resource, wherein the first frequency resource is an exclusive frequency resource of the specified small cell.

Further, the allocation module includes: a selection unit, configured to select one or more neighboring cells with the second frequency resource as the first frequency resource block when the frequency resource occupancy information indicates that there is no unoccupied frequency resource block. The target neighboring cell, wherein the second frequency resource is the shared frequency resource of the first target neighboring cell; the first sending unit is configured to use RSRP values of all neighboring cells in the first target neighboring cell to be higher than a predetermined When the threshold is reached, send a first request message to the central control node, where the first request message is used to instruct the first target neighboring cell to release the second frequency resource; the receiving unit is configured to receive a response to the first A response message to a request message, wherein the response message is used to instruct the central control node to use the second frequency resource as the first frequency resource of the specified small cell; or, the second sending unit uses When the RSRP values of some neighboring cells in the first target neighboring cell are higher than a predetermined threshold, sending a second request message to the central control node, where the second request message is used to indicate that the specified small cell is compatible with the specified The first target neighboring cell shares the second frequency resource.

Further, the allocation module includes: a second selection unit, configured to indicate that there is no unoccupied frequency resource block in the frequency resource occupancy information, and the first target neighboring cell does not have the second frequency resources, select the neighbor cell with the lowest RSRP value from the neighbor cells of the specified small cell as the second target neighbor cell; the third sending unit is configured to send a third request message to the central control node, wherein the The third request message is used to request the designated small cell and the second target neighboring cell to share the frequency resource of the second target, and use the frequency resource as the designated small cell and the second target neighboring cell The third frequency resource, wherein the third frequency resource is a frequency resource exclusively occupied by the designated small cell and the second target neighboring cell.

Through the present invention, when the specified small cell is switched from the closed state to the open state, the frequency resource of the specified small cell is allocated according to the specified information of the adjacent cell corresponding to the specified small cell, which solves the problem of the ultra-dense network in the related art. When a large number of small cells are deployed, the interference between the small cells is very strong, which leads to the degradation of the overall performance of the network, which improves the resource utilization of the small cells, thereby improving the overall performance of the network.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a method for allocating frequency resources of a small cell according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of an apparatus for allocating small cell frequency resources according to an embodiment of the present invention;

FIG. 3 is an optional structural block diagram 1 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention;

FIG. 4 is an optional structural block diagram 2 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention;

FIG. 5 is an optional structural block diagram 3 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention;

FIG. 6 is an optional structural block diagram 4 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a distribution structure of small cells in a UDN network according to an optional embodiment of the present invention;

Fig. 8 is a schematic diagram of the switch status of small and medium cells in UDN according to an optional embodiment of the present invention;

FIG. 9 is a flow chart 1 of a method for obtaining feedback switch state information and frequency band occupancy information according to an optional embodiment of the present invention;

FIG. 10 is a second flowchart of a method for obtaining feedback switch state information and frequency band occupancy information according to an optional embodiment of the present invention;

FIG. 11 is a flowchart of a method for applying for frequency resources according to an optional embodiment of the present invention;

Fig. 12 is a schematic diagram of frequency resource occupation of a small cell according to an optional embodiment of the present invention.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

This embodiment provides a method for allocating frequency resources of a small cell. FIG. 1 is a flowchart of a method for allocating frequency resources of a small cell according to an embodiment of the present invention. As shown in FIG. 1 , the steps of the method include:

Step S102: When the designated small cell is switched from the off state to the on state, obtain the designation information of the neighboring cell corresponding to the designated small cell;

Wherein, the designated information is used to reflect the interference situation of each neighboring cell to the designated small cell;

Step S104: Allocate the frequency resources of the specified small cell according to the specified information.

Through this embodiment, when the specified small cell is switched from the closed state to the open state, the frequency resource of the specified small cell is allocated according to the specified information of the adjacent cell corresponding to the specified small cell, which solves the problem of the ultra-dense network of related technologies. When a large number of small cells are deployed, the interference between the small cells is very strong, which leads to the degradation of the overall performance of the network, which improves the resource utilization of the small cells, thereby improving the overall performance of the network.

There are many ways in this embodiment to obtain the designation information of the neighbor cell corresponding to the designated small cell involved in step S102, among which, in an optional implementation manner of this embodiment, it can be realized in the following manner :

Step S11: Obtaining information indicating the switch state of the neighboring cell;

Among them, through the switch state information, the neighbor cell in the open state is obtained;

Step S12: Obtain the RSRP value of the designated small cell relative to each neighbor cell that is in the open state;

Wherein, sorting all obtained RSRP values;

Step S13: Obtain information about frequency resource occupancy of all neighboring cells that are turned on.

Wherein, the frequency resource occupancy status is used to indicate whether there is an unoccupied frequency resource block.

Regarding the method of allocating the frequency resources of the specified small cell according to the specified information involved in this embodiment, in another optional implementation manner of this optional embodiment, the frequency resource allocation method may be implemented in the following manner:

Way 1: When the frequency resource occupancy information indicates that there are unoccupied frequency resource blocks, use the unoccupied frequency resource blocks as the first frequency resources of the designated small cell, where the first frequency resources are exclusive frequency resources of the designated small cell.

Method 2: When the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, select one or more neighboring cells with the second frequency resource to be determined as the first target neighboring cell, where the second frequency resource is the first target Shared frequency resources of neighboring cells;

When the RSRP values of all neighboring cells in the first target neighboring cell are higher than a predetermined threshold, sending a first request message to the central control node, where the first request message is used to instruct the first target neighboring cell to release the second frequency resource; and receiving a response message in response to the first request message, where the response message is used to instruct the central control node to use the second frequency resource as the first frequency resource of the designated small cell; or,

When the RSRP values of some neighboring cells in the first target neighboring cell are higher than the predetermined threshold, a second request message is sent to the central control node, wherein the second request message is used to indicate that the specified small cell shares the second frequency resources.

Method 3: When the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, and the first target neighboring cell does not have the second frequency resource, select the neighboring cell with the lowest RSRP value from the neighboring cells of the specified small cell as the second Two target neighbors;

sending a third request message to the central control node, wherein the third request message is used to request the specified small cell to share the frequency resource of the second target with the second target adjacent cell, and use the frequency resource as the designated small cell and the second target adjacent cell The third frequency resource of the cell, wherein the third frequency resource is a frequency resource exclusively occupied by the designated small cell and the second target neighboring cell.

For the designated small cell in this embodiment, when the designated small cell is switched from the on state to the off state, the frequency resource occupied by the designated small cell may be released.

In this embodiment, a device for allocating frequency resources of a small cell is also provided, and the device is used to implement the above embodiments and optional implementation modes, and those that have been explained will not be repeated here. As used below, the terms "module" and "unit" may be a combination of software and/or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

FIG. 2 is a structural block diagram of a device for allocating frequency resources of a small cell according to an embodiment of the present invention. As shown in FIG. 2 , the device includes: an acquisition module 22 configured to acquire and specifying the specified information of the adjacent cell corresponding to the small cell, wherein the specified information is used to reflect the interference situation of each adjacent cell to the specified small cell; the allocation module 24 is coupled with the acquisition module 22, and is used to allocate the frequency of the specified small cell according to the specified information resource.

Fig. 3 is an optional structural block diagram 1 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention. As shown in Fig. 3 , the acquiring module 22 includes: a first acquiring unit 32, configured to acquire information; the second acquisition unit 34 is coupled with the first acquisition unit 32, and is used to acquire the RSRP value of the specified small cell relative to each neighbor cell that is in the open state; the third acquisition unit 36 is coupled with the second acquisition unit 34 , which is used to obtain information about frequency resource occupancy of all neighboring cells in the enabled state.

Fig. 4 is an optional structural block diagram 2 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention. When using a frequency resource block, an unoccupied frequency resource block is determined as the first frequency resource of the designated small cell, where the first frequency resource is an exclusive frequency resource of the designated small cell.

Fig. 5 is an optional structural block diagram 3 of an apparatus for allocating frequency resources of a small cell according to an embodiment of the present invention. As shown in Fig. 5 , the allocating module 24 includes: a selection unit 52, which is used to indicate that there is no unoccupied frequency resources when the frequency resource occupancy information indicates When the frequency resource block of the frequency resource block, select one or more neighboring cells with the second frequency resource as the first target neighboring cell, wherein, the second frequency resource is the shared frequency resource of the first target neighboring cell; the first sending unit 54 uses When the RSRP values of all neighboring cells in the first target neighboring cell are higher than a predetermined threshold, sending a first request message to the central control node, wherein the first request message is used to instruct the first target neighboring cell to release the second frequency resource; The receiving unit 56 is coupled and connected to the first sending unit 54, and is configured to receive a response message in response to the first request message, wherein the response message is used to instruct the central control node to use the second frequency resource as the first frequency resource of the designated small cell; or,

The second sending unit 58 is configured to send a second request message to the central control node when the RSRP values of some neighboring cells in the first target neighboring cell are higher than a predetermined threshold, wherein the second request message is used to indicate that the specified small cell is compatible with The first target neighboring cell shares the second frequency resource.

Fig. 6 is an optional structural block diagram 4 of a device for allocating frequency resources of a small cell according to an embodiment of the present invention. As shown in Fig. 6 , the allocation module 24 includes: a second selection unit 62, configured to indicate that the frequency resource occupancy information does not exist Unoccupied frequency resource block, and when the first target neighboring cell does not have the second frequency resource, select the neighboring cell with the lowest RSRP value from the neighboring cells of the designated small cell as the second target neighboring cell; the third sending unit 64 and The second selection unit 62 is coupled and configured to send a third request message to the central control node, wherein the third request message is used to request the designated small cell to share the frequency resources of the second target with the second target neighboring cell, and to use the frequency resource The resource is used as a third frequency resource for the designated small cell and the second target neighboring cell, wherein the third frequency resource is a frequency resource exclusively occupied by the designated small cell and the second target neighboring cell.

The present invention is illustrated below in combination with optional embodiments of the present invention.

This optional embodiment takes UDN as the application scenario, and provides a method suitable for frequency resource pre-application after the small cell is activated in the UDN scenario, by introducing factors such as interference from adjacent cells, frequency resource occupancy, and other factors that affect the frequency resource application of the cell. .

According to the purpose of this optional embodiment, it is proposed that the small cell base station in UDN needs to be able to receive the switch status information and frequency resource occupancy status information of the neighboring cells sent by other base stations or the central control node, so that the newly opened small cell can make more reasonable application for frequency resources.

The resource application method in this optional embodiment may be implemented through the following steps:

Step S202: When a small cell changes from the off state to the on state, send state transition information to the central control node, and the information is used to activate the frequency resource pre-application operation.

Step S204: The small cell sends the switch status and frequency resource occupancy information feedback request to the neighboring station, or after the central control node receives the state transition information of the cell, it directly sends the neighboring cell information of the cell, so that the newly opened The cell determines the frequency resource to apply for using through the information of the neighboring cell.

Step S206: After obtaining the switching status of the neighboring stations, all neighboring cells in the on state are screened out, and RSRP (Reference Signal Receiving Power, Reference Signal Received Power) measurement is performed on these neighboring cells.

Step S208: After the base station of the small cell completes the RSRP measurement of all neighbor stations in the open state, it sorts the measurement results from high to low. The higher the RSRP, the higher the RSRP means that the cell will be affected by the neighbor cell when the two use the same frequency band. Interference is stronger.

Step S210: the base station judges whether there are unoccupied frequency resource blocks according to the frequency resource occupancy information fed back by neighboring stations, and applies for frequency resources according to the judgment result.

Step S212: If there is an unoccupied frequency resource block, the base station directly applies to the central control node for occupying an unused frequency resource of a corresponding size as required, and takes it as the first frequency resource of the base station.

Step S214: If there is no unoccupied frequency resource block, it is detected whether there is a neighboring station using the second frequency resource according to the above ranking from high to low.

Among them, the first frequency resource is an exclusive resource to ensure that each enabled cell can guarantee the most basic data service. Only when the interference between two adjacent cells is very low and there are no other available frequency resources can it be used as this frequency resource at the same time. The first frequency resources of two cells are multiplexed; the second frequency resource is a shared resource, which can be used by multiple cells to improve their respective service quality under the condition of ensuring low interference between neighboring cells.

Step S216: If there is a neighboring station using the second frequency resource, select a neighboring station with a higher average RSRP value in the sorting and owning the second frequency resource as a target. At the same time, RSRP threshold 1 is set to screen out the rest of the neighboring stations occupying the target frequency band. When the RSRP measurement value of the selected neighboring station is higher than the threshold 1, the micro base station sends a request to the central control node to release the second frequency resource of the target neighboring station and The section of second frequency resource of the neighboring station whose RSRP value is higher than threshold one is used as its own first frequency resource; otherwise, only a request is sent to the central control node to release the second frequency resource of the target neighboring station for its own use.

Step S218: After receiving the request from the station, the central control node sends an instruction to reclaim the segment of the second frequency resource to all target cells, so that the micro cell can use it as the first frequency resource.

Step S220: If there is no neighboring station using the second frequency resource, select the neighboring station with the lowest RSRP value in the sorting as the target, and the base station sends a request to the MNB to reuse the same frequency resource with the target base station, and the resource blocks are two The first frequency resource of the base station.

Step S222: When the cell changes from the on state to the off state, the frequency resource occupied by it is released and can be used by other cells as the first or second frequency resource.

The optional embodiment is illustrated below in conjunction with the accompanying drawings and specific embodiments;

FIG. 7 is a schematic diagram of the distribution structure of small cells in a UDN network according to an optional embodiment of the present invention. As shown in FIG. There are different types, such as Pico, SmallCell, Micro, Femto, etc., which can be collectively referred to as low-power transmitting base stations LNB.

Figure 8 is a schematic diagram of the switching status of small cells in UDN according to an optional embodiment of the present invention. , some small cells with low loads need to be turned off, which will result in the phenomenon of cell switching as shown in FIG. 8 .

In this optional embodiment, the process of SmallCell applying for and allocating frequency resources may include the following steps:

Step S302: When a SmallCell changes from the OFF state to the ON state, obtain the feedback switch state information and frequency band occupancy information of its neighboring stations;

Among them, the above-mentioned acquisition of the switch status, frequency resource usage status and interference to the local area of the adjacent cell is to enable better frequency resource application to reduce mutual interference;

In addition, the frequency band occupancy information should include: occupancy of frequency resource blocks, division of the first frequency resource and the second frequency resource, so that newly opened cells can apply for better frequency resources more conveniently and accurately. Among them, the first frequency resource is an exclusive resource to ensure that each enabled cell can guarantee the most basic data service. Only when the interference between two adjacent cells is very low and there are no other available frequency resources can it be used as this frequency resource at the same time. The first frequency resources of two cells are multiplexed; the second frequency resource is a shared resource, which can be used by multiple cells to improve their respective service quality under the condition of ensuring low interference between neighboring cells.

Step S304: The cell comprehensively considers the sorting of RSRP received values of adjacent cells in the open state and the frequency resource occupancy status fed back. When there are unoccupied frequency resources, the frequency resource block is preferentially used to achieve regular use of frequency resources between adjacent stations. When there is no unoccupied frequency resource, the frequency resource to be applied is determined according to the allocation status of the first and second frequency resources of the neighboring cell and the RSRP sorting.

Taking SmallCell as an example to obtain neighboring station information, the above step S302 is described in the form of two specific embodiments.

Embodiment one:

When a cell changes from the OFF state to the ON state, the initial frequency resource application process of the cell will be activated. When the cell is just turned on, the location of each UE in the cell cannot be determined, so the interference received by each UE from other cells cannot be determined. Therefore, resources should be applied and allocated according to factors such as the frequency used by other cells and RSRP to avoid other cells from interfering with the cell. Interference caused by internal UEs.

FIG. 9 is a flow chart 1 of a method for obtaining feedback switch state information and frequency band occupancy information according to an optional embodiment of the present invention. The steps of the method include:

Step S902: the small cell changes from the OFF state to the ON state, activating the initial frequency resource application process;

Step S904: the small cell sends a request for feedback on the switch status and frequency resource occupation to the neighboring cell;

Step S906: After receiving the feedback request, the neighboring cell sends its own switch status and frequency resource occupancy information through the broadcast channel;

Step S404: After the small cell that has just been turned on obtains the switching status of the neighboring cells, it measures the reference signal received power RSRP for all the neighboring cells that are in the turned-on state, and sorts the measurement results.

Among them, when the RSRP value of a neighboring cell is measured to be larger, it means that the neighboring cell has greater interference to the UE in the small cell as a whole. Therefore, when applying for frequency resources, priority should be given to avoid using the same frequency resource as the neighboring cell with a larger RSRP. frequency resources.

Embodiment two

FIG. 10 is a second flowchart of a method for obtaining feedback switch state information and frequency band occupancy information according to an optional embodiment of the present invention, which is another implementation of step S302 in this optional embodiment. The steps of this method include:

Step S1002: the small cell changes from the OFF state to the ON state, activating the initial frequency resource application process;

Step S1004: The small cell sends information feedback on the switching status of adjacent cells and the occupancy of frequency resources to the MasterTP;

Step S1006: After receiving the request from the cell, the MasterTP finds its neighbor cell according to the coordinate information of the small cell, and sends it the real-time switching information and frequency resource occupation information of the neighbor cell;

Step S1008: After obtaining the on/off status of neighboring cells, the small cell that has just been turned on measures the reference signal received power (RSRP) for all neighboring cells that are turned on, and sorts the measurement results.

FIG. 11 is a flow chart of a method for applying for frequency resources according to an optional embodiment of the present invention. As shown in FIG. 11, it is an implementation method of step S304 in this optional embodiment. The method includes the following steps:

Step S1102: Determine whether there are unoccupied frequency resources; if there are unoccupied frequency resources, skip to step S1104; otherwise, go to step S1106.

Step S1104: The small cell can directly apply to the central control node for an unoccupied frequency resource block of a corresponding size according to user needs for use by users in the cell; then execute step S1112;

Step S1106: Determine whether there is an adjacent cell using the resource of the second frequency; if there is a resource using the second frequency in the adjacent cell, execute step S1108; otherwise, execute step S1110;

That is to continue to analyze the first and second frequency usage of each neighboring cell according to the frequency occupancy information fed back by the neighboring cell, so as to perform a better frequency resource application;

Step S1108: apply for the second frequency resource of the neighboring cell with the highest RSRP measurement value and own the second frequency resource, and reclaim this part of the frequency resource;

Among them, the characteristic of the second frequency resource is that there may be multiple neighboring cells for shared use, so in order to reduce interference, select the neighbor cell that owns the second frequency resource and has the highest RSRP ranking as the target, and at the same time, according to the second frequency The resource selects all neighboring cells that are using the frequency resources of this segment, compares the RSRP reception value of these neighboring cells with the first preset value of RSRP, and takes all the neighboring cells whose RSRP value is greater than the first preset value as target cells, Then apply to the central control node to occupy the second frequency resource and take back the resource of all target cells.

When receiving the frequency resource application, the upper layer will take back the second frequency resource of the target neighboring cell and allocate it to the applied small cell. The reason for this step is that the second frequency resource is a shared resource, and when the cell applies for use, taking back the frequency of the cell with greater interference can cause minimal interference to other neighboring cells.

Step S1110: send to MasterTP a request for multiplexing frequency resources with the lowest cell in the RSRP ranking;

Wherein, when all neighboring cells only use the first frequency resource, select the lowest neighboring cell in the RSRP ranking as the target, and apply to the central control node for reuse of the first frequency resource used by the neighboring cell. Through such a frequency resource application, while ensuring orthogonality with frequency resources used by other adjacent cells, it can also ensure minimum interference with adjacent cells that reuse frequencies.

Step S1112: the cell changes from the ON state to the OFF state, and releases the occupied frequency resource back into the resource pool, which can be used by other cells as the first or second frequency resource.

Embodiment Three

Fig. 12 is a schematic diagram of frequency resource occupation of a small cell and a schematic diagram of RSRP sorting according to an optional embodiment of the present invention. It can be seen from FIG. 12 that the small cell base station that has just been turned on in cell a has cells b, c, d, e, and f around it. According to the implementation method of this patent, after a is turned on, a request for obtaining neighboring cell information is sent to the central control node; after receiving the request, the central control node finds out all neighboring cells b, c, d, e, f according to the coordinate information of a , and obtain the switch information and frequency resource occupancy information of these cells according to the information reported by these small cell nodes, and then send these information to the small cell a. After a obtains the feedback information of a, it knows that the adjacent small cells it turns on are b, c, d, e, and f, and the RSRP order of these cells is obtained through measurement as cells c, f, e, b, and d.

At this time, according to the obtained frequency resource occupancy information of each adjacent cell, it can be known that all the frequency resources of the frequency are occupied, and it is known that some of these adjacent cells have the second frequency resource. After following the above implementation steps, base station a will apply for The second frequency block 6 of base station f is used as its own first frequency resource and requests small cell f and small cell b to release the block of frequency resources, as shown in Table 1:

Table 1

Table 2 shows the frequency resource block occupancy of the small cell a-small cell f after the above adjustment, as shown in Table 2:

Cell ID Occupancy of frequency resource blocks a 6 b 12 c 4 d 5,3 e 1, 3 f 4

Table 2

In this optional embodiment, when a small cell is turned on based on the cell switch mode, it will trigger a request message for the switch status of the adjacent cell, frequency resource occupancy, and the measurement of the reference signal received power value of the adjacent cell by the cell; After the interference level of the adjacent cell and the frequency resource occupancy, the small cell conducts a comprehensive consideration and applies for the optimal frequency resource for use. Through this optional embodiment, the small cell can obtain the frequency resource with the least interference to the adjacent cell. In turn, the overall network performance can be improved.

The above is only an optional embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. A method for allocating small cell frequency resources, comprising: When the designated small cell is switched from the off state to the on state, obtaining designation information of neighboring cells corresponding to the designated small cell, wherein the designation information is used to reflect the interference of each of the neighboring cells to the designated small cell Condition; Allocating frequency resources of the specified small cell according to the specified information. 2. The method according to claim 1, wherein obtaining the designated information of the neighboring cell corresponding to the designated small cell comprises: Acquiring information indicating the switch state of the neighboring cell; Acquiring the RSRP value of the designated small cell relative to each of the neighboring cells that are in the enabled state; Obtain information about frequency resource occupancy of all the adjacent cells in the enabled state. 3. The method according to claim 2, wherein allocating frequency resources of the specified small cell according to the specified information comprises: When the frequency resource occupancy information indicates that there is an unoccupied frequency resource block, use the unoccupied frequency resource block as the first frequency resource of the designated small cell, where the first frequency resource is all Describe the exclusive frequency resources of the specified small cell. 4. The method according to claim 3, wherein allocating frequency resources of the specified small cell according to the specified information comprises: When the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, select one or more neighboring cells with a second frequency resource to be determined as the first target neighboring cell, where the second frequency resource is shared frequency resources of the first target neighboring cell; When the RSRP values of all neighboring cells in the first target neighboring cell are higher than a predetermined threshold, a first request message is sent to the central control node, wherein the first request message is used to indicate that the first target neighboring cell is released the second frequency resource; and receiving a response message in response to the first request message, where the response message is used to instruct the central control node to use the second frequency resource as the specified small cell the first frequency resource; or, When the RSRP values of some neighboring cells in the first target neighboring cell are higher than a predetermined threshold, a second request message is sent to the central control node, where the second request message is used to indicate that the designated small cell is compatible with the The first target neighboring cell shares the second frequency resource. 5. The method according to claim 4, wherein allocating frequency resources of the specified small cell according to the specified information comprises: When the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, and the first target neighboring cell does not have the second frequency resource, select RSRP from neighboring cells of the specified small cell The neighbor with the lowest value is used as the second target neighbor; sending a third request message to the central control node, where the third request message is used to request the designated small cell to share the frequency resource of the second target with the second target neighbor cell, and to share the frequency resource of the second target The resource is used as a third frequency resource of the designated small cell and the second target neighboring cell, where the third frequency resource is a frequency resource exclusively occupied by the designated small cell and the second target neighboring cell. 6. The method according to any one of claims 1 to 5, characterized in that the method further comprises: When the specified small cell is switched from the on state to the off state, release the frequency resources occupied by the specified small cell. 7. A device for allocating frequency resources of a small cell, comprising: An acquisition module, configured to acquire designated information of neighboring cells corresponding to the designated small cell when the designated small cell is switched from the off state to the on state, wherein the designated information is used to reflect the impact of each of the neighboring cells on the Specify the interference situation of the small cell; An allocating module, configured to allocate frequency resources of the specified small cell according to the specified information. 8. The device according to claim 7, wherein the acquiring module comprises: a first acquiring unit, configured to acquire information indicating the switch state of the neighboring cell; A second obtaining unit, configured to obtain the RSRP value of the designated small cell relative to each of the neighboring cells that are in the enabled state; The third acquiring unit is configured to acquire the information about the frequency resource occupancy of all the adjacent cells in the enabled state. 9. The device according to claim 8, wherein the distribution module comprises: A determining unit, configured to determine the unoccupied frequency resource block as the first frequency resource of the designated small cell when the frequency resource occupancy information indicates that there is an unoccupied frequency resource block, wherein the The first frequency resource is an exclusive frequency resource of the specified small cell. 10. The device according to claim 9, wherein the distribution module comprises: A selecting unit, configured to select one or more adjacent cells with second frequency resources as first target adjacent cells when the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, wherein the first The second frequency resource is a shared frequency resource of the first target neighboring cell; The first sending unit is configured to send a first request message to the central control node when the RSRP values of all neighboring cells in the first target neighboring cell are higher than a predetermined threshold, where the first request message is used to indicate the The first target neighboring cell releases the second frequency resource; a receiving unit, configured to receive a response message in response to the first request message, where the response message is used to instruct the central control node to use the second frequency resource as the first frequency resource of the designated small cell; frequency resources; or, The second sending unit is configured to send a second request message to the central control node when the RSRP values of some neighboring cells in the first target neighboring cell are higher than a predetermined threshold, where the second request message is used to indicate the The specified small cell shares the second frequency resource with the first target neighboring cell. 11. The device according to claim 10, wherein the distribution module comprises: The second selection unit is configured to, when the frequency resource occupancy information indicates that there is no unoccupied frequency resource block, and the first target neighboring cell does not have the second frequency resource, select from the specified small Select the neighbor with the lowest RSRP value among the neighbors of the cell as the second target neighbor; A third sending unit, configured to send a third request message to the central control node, where the third request message is used to request the designated small cell to share the second target cell with the second target neighboring cell frequency resource, and use this frequency resource as the third frequency resource between the designated small cell and the second target neighboring cell, wherein the third frequency resource is the designated small cell and the second target neighboring cell Exclusive frequency resources.