Cell access control method and device

Technical field of cell access control method and device

[0001] The present invention relates to the field of communication technologies, and in particular, to a cell access control method and device.

Background technique

[0002] In current wireless networks, user access control is often performed by judging wireless resources, without considering the inter-cell situation, and simple resource allocation is performed for the users who will access, and new users access , When an old user switches to a new cell or when a user in a cell adjusts resources, the cell admission process is required.

[0003] For example, in a 3G R4 system, users generally use dedicated channels, and the system is limited by code channel resources or power resources. Admission strategies mainly include admission based on the number of users, admission based on power, and admission based on code channel resources. In the High Speed Packet Access (HSPA) system, due to the resource sharing and fast scheduling characteristics, the admission control algorithm in the R4 system is no longer applicable. The admission strategy is mainly based on the number of users and the calculation of resource utilization. Algorithm.

[0004] In the Long Term Evolution (LTE) system, the allocated physical resources are power and time-frequency resources, and the transmission of user data adopts a shared channel. The admission strategy is similar to that of the HSPA system. The guaranteed bit rate (Guaranteed Bit Rate) is calculated. Rate, GBR) and non-guaranteed bit rate (Non-GBR, NGBR) service resource utilization, based on the new resource block (Resource Block, RB) occupies the physical resource block (Physical Resource Block, PRB) threshold to make judgments, based on user access The number of admission algorithms is simple and easy to implement, but the accuracy is not enough. It can be used as a simple implementation of the admission algorithm; based on the resource utilization rate, set an appropriate resource utilization threshold. When the following conditions are met, the admission is successful, otherwise the admission fails. , That is (existing user resource utilization + predicted value of new service resource demand) / total system available resources <resource utilization threshold.

[0005] In the LTE system, the LTE system adopts Orthogonal Frequency Division Multiplex (Orthogonal Frequency Division Multiplex, OFDM) technology. All user equipments (UEs) share time-frequency resources through scheduling, and the number of UEs in a cell is mainly limited by the number of UEs in the cell. The total time-frequency resources, so the data radio bearer (DataRadio Bearer, DRB) is based on code channel and power.

[0006] In summary, the prior art does not consider the actual impact of inter-cell interference on the time domain, frequency domain, and code domain. It simply judges whether there are resources, which may cause unbalanced load between cells. The load of the cell is too large, and some cells have a small load, which affects the work efficiency of the network.

Summary of the invention

[0007] Embodiments of the present invention provide a cell access control method and device, which are used to combine the load conditions of each cell to implement cell access control for UEs, so that the load between cells is more balanced, and the work efficiency of the network is improved. .

[0008] A cell access control method provided by an embodiment of the present invention includes:

[0009] Determine the load of the cell where the user equipment is located and the neighboring cells;

[0010] When the load of the cell where the user equipment is located exceeds a preset threshold, the target cell to be accessed is determined according to the load status of the neighboring cells, and the user equipment is connected to the target cell.

[0011] A cell access control device provided by an embodiment of the present invention includes:

[0012] a load determining unit for determining the load of the cell where the user equipment is located and the neighboring cell;

[0013] The judgment processing unit is configured to determine an access target cell according to the load status of the neighboring cell when the load of the cell where the user equipment is located exceeds a preset threshold, and connect the user equipment to the target cell.

[0014] In the embodiment of the present invention, the load of the cell where the user equipment is located and the neighboring cell are determined; when the load of the cell where the user equipment is located exceeds a preset threshold, the target cell to be accessed is determined according to the load status of the neighboring cell, and the user equipment is connected to it. Into the target cell, thereby combining the load conditions of each cell, realizes cell access control of the UE, makes the load between the cells more balanced, and improves the work efficiency of the network.

Description of the drawings

[0015] FIG. 1 is a schematic diagram of the overall flow of a cell access control method provided by an embodiment of the present invention;

[0016] FIG. 2 is a schematic diagram of a specific flow of a cell access control method provided by an embodiment of the present invention;

[0017] FIG. 3 is a schematic structural diagram of a cell access control device provided by an embodiment of the present invention.

Detailed ways

[0018] The embodiments of the present invention provide a cell access control method and device, which are used to combine the load conditions of each cell to implement cell access control for UEs, so that the load between cells is more balanced, and the work efficiency of the network is improved. .

[0019] The embodiments of the present invention mainly solve the problem of time domain, frequency domain, and code domain resource allocation when users access in a wireless network. Through Inter-Cell Interference Coordination (ICIC) reporting, it solves the resource allocation of users who are about to access, reduces interference in the network, enables the wireless communication network to maximize its capacity, and solves the problem of service access for users at the edge of the network. At the same time, it also solves the access problem of wireless network optimization, reduces the pressure of network optimization, and keeps the wireless network in an appropriate capacity state.

[0020] Referring to FIG. 1, a cell access control method provided by an embodiment of the present invention generally includes the following steps:

[0021] S101. Determine the load of the cell where the user equipment is located and the neighboring cell;

[0022] S102: When the load of the cell where the user equipment is located exceeds a preset threshold, determine an access target cell according to the load status of the neighboring cell, and connect the user equipment to the target cell.

[0023] Preferably, the method further includes:

[0024] When the load of the cell where the user equipment is located does not exceed the preset threshold, the user equipment is connected to the cell where the user equipment is located.

[0025] Preferably, the determining the target cell to be accessed according to the load condition of the neighboring cell, and connecting the user equipment to the target cell includes:

[0026] Neighboring cells whose load does not exceed a preset threshold form an optimal set of neighboring cells;

[0027] Select the optimal neighboring cell from the optimal neighboring cell set, and connect the user equipment to the optimal neighboring cell.

[0028] Preferably, the selecting the optimal neighboring cell from the optimal neighboring cell set and connecting the user equipment to the optimal neighboring cell includes:

[0029] sorting the neighboring cells in the optimal neighboring cell set in the descending order of the load of the neighboring cells in the optimal neighboring cell set;

[0030] Starting from the neighboring cell with the smallest load, select neighboring cells from the optimal neighboring cell set as the optimal neighboring cells in turn;

[0031] When the optimal neighboring cell allows the user equipment to access, the user equipment is connected to the optimal neighboring cell.

[0032] Preferably, the method further includes:

[0033] When the optimal neighboring cell does not allow user equipment to access, it is judged whether there are any neighboring cells in the optimal neighboring cell set that have not been selected as the optimal neighboring cell, and if so, according to the order of load from small to large, Continue to select the neighboring cell as the optimal neighboring cell; otherwise, connect the user equipment to the cell where the user equipment is located.

[0034] In the embodiment of the present invention, based on the ICIC function of the wireless network, the cell load information is exchanged through the X2 interface to understand the resource usage and interference situation of neighboring cells, and try to avoid the already used or interference of neighboring cells when scheduling UEs in this cell. Larger PRBs, or reduce power transmission on these PRBs, and at the same time inform neighboring cells of the resource utilization of the cell, try to avoid resource collisions between neighboring cells, so that users can finally access resources with lower interference, so that the network To achieve the optimal state, specific cell access control methods include:

[0035] When the user equipment is in an idle (IDLE) state to initiate cell access, the network side determines whether the load of the cell where the user equipment is located exceeds a threshold, and the threshold may be pre-configured by an object management (Object Management, OM) entity.

[0036] If the threshold is not exceeded, access the UE in the current cell. If the threshold is exceeded, determine the load status of all neighboring cells in the current cell, and further sort the neighboring cells according to the order of load from largest to smallest;

[0037] Through the cell load threshold preset by OM (for example, the value of the threshold may be 5dB, 6dB, 7dB or 8dB), all neighboring cells with a load lower than the threshold are selected to form an optimal neighboring cell set, and Sort in the order of load from small to large; specifically, when determining the optimal set of neighboring cells, the base station measures the Interference over Thermal (IOT) parameter value on each PRB of each cell, according to the IOT average value Divide the community into 3 levels: low, medium, and high;

[0038] For example, it may be pre-configured: the average value of IOT of 10 PRBs, the average value of IOT of 15 PRBs, or the average value of IOT of 20 PRBs;

[0039] The IOT of 10 PRBs in each cell is averaged. If the average value is in the range of 0-5dB, the cell is listed as a low-level cell; if the average value is in the range of 5-10dB, the cell is listed Enter the middle-level cell; if the average value is greater than 10dB, then the cell will be listed as a high-level cell.

[0040] Then, low-level cells can be added to the optimal neighboring cell set.

[0041] According to the order of load from small to large, select neighboring cells from the set of optimal neighboring cells as the optimal neighboring cell, and determine whether the optimal neighboring cell is allowed to access (cell allowed access means that the cell is not in the cell barring Access (BAR) state, the cell is not allowed to access means that the cell is in the BAR state), if allowed, then access in the target cell (the best neighboring cell); if the target cell is not allowed to access, judge whether the target cell is The last neighbor cell in the optimal neighbor cell set, if it is, access it in the current cell where the user equipment is located; if it is not, reselect the target cell for access;

[0042] According to the above algorithm, until the user equipment accesses the optimal cell, the process of the user equipment accessing the network ends.

[0043] A description of a specific embodiment is given below.

[0044] Referring to FIG. 2, a cell access control method provided by an embodiment of the present invention specifically includes the steps:

[0045] S201. Generate a link establishment request.

[0046] Wherein, the link establishment request is used for a user equipment that is in an idle state, or a user equipment that is about to perform a cell handover, to establish a wireless connection path with the base station.

[0047] S202. Determine the current cell load and the load of neighboring cells.

[0048] Wherein, the current cell is the cell where the UE is currently located. The neighboring cell, that is, the cell where the UE is currently located

Neighbouring cell.

[0049] S203. Determine whether the load of the current cell exceeds a preset threshold, and if so, perform step S204; otherwise, perform step S210.

[0050] S204. Determine an optimal set of neighboring cells. That is, the neighboring cells whose load does not exceed the preset threshold form an optimal neighboring cell set.

[0051] S205, the neighboring cells in the optimal neighboring cell combination are sorted according to the order of load from small to large.

[0052] S206: Starting from the neighboring cell with the smallest load, select the neighboring cell from the optimal neighboring cell set as the optimal neighboring cell, that is, as the target cell for the user equipment to access.

[0053] S207. Judge whether the target cell is allowed to access, if yes, perform step S208; otherwise, perform step

S209o

[0054] S208. Control the user equipment to access in the target cell.

[0055] S209. Determine whether there is an optional optimal neighbor cell, that is, determine whether there is a neighbor cell in the optimal neighbor cell set that has not been selected as the optimal neighbor cell, and if so, perform step S206; otherwise, Step S210 is executed.

[0056] S210. Control user equipment to access in the current cell.

[0057] Referring to FIG. 3, a cell access control apparatus provided by an embodiment of the present invention includes:

[0058] The load determining unit 11 is configured to determine the load of the cell where the user equipment is located and the neighboring cells;

[0059] The judgment processing unit 12 is configured to determine the target cell to be accessed according to the load condition of the neighboring cell when the load of the cell where the user equipment is located exceeds a preset threshold, and to connect the user equipment to the target cell.

[0060] Preferably, the judgment processing unit 12 is also used for:

[0061] When the load of the cell where the user equipment is located does not exceed the preset threshold, the user equipment is connected to the cell where the user equipment is located.

[0062] Preferably, the judgment processing unit 12 forms an optimal neighbor cell set with neighboring cells whose load does not exceed a preset threshold; selects the optimal neighbor cell from the optimal neighbor cell set, and connects the user equipment to the optimal neighbor cell set. The best neighboring cell.

[0063] Preferably, the judgment processing unit 12 sorts the neighboring cells in the optimal neighboring cell set in the order of the load of the neighboring cells in the optimal neighboring cell set; Starting from the neighboring cell, the neighboring cell is selected from the optimal neighboring cell set as the optimal neighboring cell in turn; when the optimal neighboring cell allows the user equipment to access, the user equipment is connected to the optimal neighboring cell.

[0064] Preferably, the judgment processing unit 12, when the optimal neighboring cell does not allow the user equipment to access, determines whether there are any neighboring cells in the optimal neighboring cell set that have not been selected as the optimal neighboring cell, if If yes, continue to select the neighboring cell as the optimal neighboring cell in the order of the load from small to large; otherwise, the user equipment is connected to the cell where the user equipment is located.

[0065] Preferably, the cell access control device provided in the embodiment of the present invention may be a base station.

[0066] In summary, the embodiment of the present invention provides a new solution for user equipment access to the network to determine the load of the cell where the user equipment is located and adjacent cells; when the load of the cell where the user equipment is located exceeds a preset threshold According to the load of the neighboring cell, the user equipment is connected to the target cell. This technical solution is suitable for the frequency division duplex long-term evolution (FDD-LTE) wireless network system. The technical solution mainly uses the ICIC function to output the load between the cells. The interference situation can reach the maximum network capacity; and the X2 interface is mainly used to quickly feed back the status of neighboring cells, which can be fed back to the network more quickly than the power and resource occupancy rate algorithms of the prior art; it can make optimal use of wireless The time-frequency domain resources in the network maximize the resource utilization.

[0067] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program

product. Therefore, the present invention may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.

[0068] The present invention is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated for use It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

[0069] These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device , The instruction device realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

[0070] These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so that the computer or other programmable equipment The instructions executed on the above provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

[0071] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.