JP2012044663A - Managing method and managing device for cell in carrier aggregation environment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a managing method and a managing device for a cell in a carrier aggregation environment.SOLUTION: The managing method includes: a step A for acquiring channel quality parameter measurement values in whole cells on whole carriers of whole base stations, which are measured by a user facility; a step B for specifying a correction amount corresponding to the channel quality parameter measurement value based on a carrier frequency corresponding to at least the channel quality parameter measurement value, and correcting the corresponding channel quality parameter measurement value by using the correction amount; and a step C for selecting a maximum value from the channel quality parameter measurement value after correction since the correction amount corresponding to the channel quality parameter measurement value becomes larger as the carrier frequency corresponding to the channel quality parameter measurement value is higher and for arranging the cell corresponding to the channel quality parameter measurement value after correction, which has the maximum value, in a primary cell of the user facility.

Description

  The present invention relates to a mobile communication system, and more particularly to a cell management method and management apparatus in a carrier aggregation environment.

  The 3rd Generation Partnership Project (3GPP), as an important organization in the mobile communication field, greatly promotes the standardization of 3G (The Third Generation), WCDMA (Wide Code Division Multiple Access), HSDPA (High Speed Downlink Packet Access), HSUPA A series of communication system standards including (High Speed Uplink Packet Access) has been established.

  In response to the challenges of broadband access technology, 3GPP launched standardization of 3G LTE (Long Term Evolution) technology at the end of 2004 to satisfy the demand for new services that are growing day by day. In June 2008, 3GPP completed the LTE-A technical requirement report, and the minimum requirements of LTE-A, namely, downlink peak speed: 1 Gbps, uplink peak speed: 500 Mbps, uplink peak frequency spectrum utilization: 15 Mbps / HZ, downstream peak frequency spectrum utilization ratio: 30 Mbps / HZ. These parameters are much higher than the ITU's minimum technical requirement index and are clearly dominant.

  LTE-A supports continuous carrier aggregation and non-continuous carrier aggregation within and between bands, and the maximum bandwidth that can be aggregated can reach 100 MHz. In order to effectively use carriers in the early commercial stages of LTE-A, i.e. to ensure that LTE user equipment can access the LTE-A system, each carrier must be located on a carrier that is backward compatible with LTE. It cannot be excluded that it is designed for a carrier used only for the LTE-A system. Currently, 3GPP has identified 12 types of carrier aggregation application scenes according to the demands of telecommunications carriers. Of these, 4 types are the most important, but the continuous and non-continuous carrier aggregation scenes of FDD and TDD respectively. Concerning. In the LTE-A research phase, carrier aggregation related research focuses on improving the frequency spectrum utilization rate of continuous carrier aggregation and designing control channels for carrier aggregation scenes that are asymmetric in the vertical direction.

  Considering the demands on the new frequency spectrum by LTE-A, carriers will consider backward compatibility as well as the introduction of new frequency ranges and radio frequency links. Since new and existing radio frequency links are independent of each other, carriers have greater flexibility when deploying networks. In FIG. 1, a white ellipse indicates an existing cell, and an ellipse with a diagonal line indicates a newly introduced cell. If the frequency of the new cell to be introduced is different from that of the existing cell, the carrier can turn the corresponding antenna according to the environmental demands, and compensate for the cell boundaries of the original network. Get excellent throughput and network coverage. In a carrier aggregation system, when a joint scaling method is adopted for a terminal between a plurality of component carriers, ideal system performance can usually be acquired.

  As another typical application scene, in a heterogeneous network environment, newly deployed base stations with low coverage, such as Picocells, radio access points (RRHs), etc., have different frequencies or different from traditional macro base stations. Through the connection and exchange of information with the macro base station using the frequency range, carrier aggregation can be similarly realized, and the system capacity can be improved.

  Of course, carrier aggregation is also performed in many other application scenes. The carrier can use different application scenes voluntarily and flexibly according to his / her demand, considering factors such as application area, user capability, and base station antenna arrangement.

  According to the 3GPP standard, there are two types of component carriers for user equipment: primary component carriers and secondary component carriers. Correspondingly, the cell used by the user equipment on the primary component carrier is called a primary cell (Primary Cell, PCell), and the cell used on the secondary component carrier is called a secondary cell (Secondary Cell, SCell). The One user equipment can simultaneously use a plurality of secondary component carriers and their corresponding secondary cells, but there must be one primary component carrier and one corresponding primary cell. When carrying out carrier aggregation, the degree of aggregation can be controlled using two methods, an absolute value method and a relative value method. When using the absolute value method, after selecting one primary cell, the candidate secondary cell / secondary cell is added / deleted based only on the absolute value of the channel quality parameter of the candidate secondary cell / secondary cell on the secondary component carrier Decide what you need to do. When using the relative value method, after selecting one primary cell, it is necessary to compare the relative relationship between the channel quality parameters of the primary cell and the candidate secondary cell / secondary cell. Based on this relative relationship, Determine if cells / secondary cells need to be added / removed.

  However, in the above method, the component carrier selection only considers the channel quality factor and can be further optimized to improve the user experience speed.

  An object of the present invention is to provide a cell management method and a management apparatus in a carrier aggregation environment, and to improve a user's experience speed in the carrier aggregation environment.

  In order to achieve the above object, an embodiment of the present invention provides a cell management method in a carrier aggregation environment.

  In a cell management method in a carrier aggregation environment, step A for acquiring channel quality parameter measurement values in all cells on all carriers of all base stations measured by user equipment, and carrier frequency corresponding to at least channel quality parameter measurement values Step B for identifying a correction amount corresponding to the channel quality parameter measurement value and correcting the corresponding channel quality parameter measurement value using the correction amount, but corresponding to the channel quality parameter measurement value The higher the carrier frequency, the larger the correction amount corresponding to the channel quality parameter measurement value. The maximum value is selected from the corrected channel quality parameter measurement values, and the corrected channel quality parameter measurement value having the maximum value is selected. The corresponding cell is assigned to the user equipment Comprising a step C of placing the Riseru, the.

  In step B of the management method, the correction amount is specified based on the carrier frequency corresponding to the channel quality parameter measurement value and the cell load corresponding to the channel quality parameter measurement value, and is handled using the correction amount. The channel quality parameter measurement value is corrected. However, the smaller the cell load corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value.

  The management method includes step D for acquiring a secondary cell candidate set, except that all cells in the secondary cell candidate set belong to the same base station as the primary cell and correction of each cell in the secondary cell candidate set The sum of the subsequent channel quality parameter measurement value and the subscription threshold is equal to or greater than the corrected channel quality parameter measurement value corresponding to the primary cell, and the corrected channel quality parameter measurement value is maximum in the cell corresponding to each carrier. Step E for executing a deletion operation on the secondary cell candidate set so as to hold only the cells of the cell, and a part or all of the cells in the secondary cell candidate set after execution of the deletion operation are arranged in the secondary cell of the user equipment And step F.

  The management method includes step G for determining whether the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value of the primary cell; If the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, the existing secondary cell is And a step H of executing a deletion operation so as not to be a secondary cell.

  In step D of the management method, the subscription threshold is determined by the load on the service base station. The greater the load on the service base station, the smaller the subscription threshold.

  In step H of the management method, the deletion threshold is determined by the load on the service base station, and the deletion threshold increases as the load on the service base station increases.

  In order to achieve the above object, an embodiment of the present invention further provides a cell management apparatus in a carrier aggregation environment.

  The management apparatus is based on a measurement value acquisition module that acquires channel quality parameter measurement values in all cells on all carriers of all base stations measured by user equipment, and at least a carrier frequency corresponding to the channel quality parameter measurement values A correction module that specifies a correction amount corresponding to the channel quality parameter measurement value and corrects the corresponding channel quality parameter measurement value using the correction amount, provided that the carrier frequency corresponding to the channel quality parameter measurement value is The higher the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value. The maximum value is selected from the corrected channel quality parameter measurement value, and the cell corresponding to the corrected channel quality parameter measurement value having the maximum value is selected. Is arranged in the primary cell of the user equipment. Including Le and, the.

  The correction module of the management device specifies the correction amount corresponding to the channel quality parameter measurement value based on a carrier frequency corresponding to the channel quality parameter measurement value and a cell load corresponding to the channel quality parameter measurement value, The corresponding channel quality parameter measurement value is corrected using the correction amount. However, the smaller the cell load corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value.

  The management device is a set acquisition module for acquiring a secondary cell candidate set, provided that all cells in the secondary cell candidate set belong to the same base station as the primary cell, and each cell in the secondary cell candidate set The sum of the corrected channel quality parameter measurement value and the subscription threshold is equal to or greater than the corrected channel quality parameter measurement value corresponding to the primary cell, and the corrected channel quality parameter measurement value is the cell corresponding to each carrier. A first deletion module that executes a deletion operation on the secondary cell candidate set so as to hold only the largest cell, and a part or all of the cells in the secondary cell candidate set after the deletion operation is executed A second placement module disposed in the cell.

  A determination module that determines whether the sum of the channel quality parameter measurement value after correction of the existing secondary cell of the user equipment and the deletion threshold is smaller than the channel value parameter measurement value after correction of the primary cell; If the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, the existing secondary cell is A second deletion module that performs a deletion operation so as not to be a secondary cell.

  In the management apparatus, the subscription threshold is determined by a load on the service base station, and the subscription threshold decreases as the load on the service base station increases.

  In the management apparatus, the deletion threshold is determined by the load on the service base station, and the deletion threshold increases as the load on the service base station increases.

  According to the embodiment of the present invention, the following beneficial effects can be obtained.

  The embodiment of the present invention corrects the channel quality parameter measurement value through the frequency or the element related to the frequency and the load, uses the corrected measurement value to arrange the primary cell, and sets the secondary cell according to the load. Adjusting the selection / deletion threshold not only improves the user experience speed in the carrier aggregation environment, but also balances the load among the cells.

The application scene of the carrier aggregation system in a prior art is shown. The exploded view of the carrier aggregation system in FIG. 1 is shown. The flow of the cell management method in the carrier aggregation environment in the Example of this invention is shown. The simulation result by the method of the Example of this invention is shown. The simulation result by the method of the Example of this invention is shown.

  In the embodiment of the present invention, the channel quality parameter is corrected based on the correction amount that affects the channel quality parameter, and the component carrier is selected based on the corrected channel quality parameter, thereby improving the user experience speed in the carrier aggregation environment. Let

  As shown in FIG. 3, the cell management method in the carrier aggregation environment in the embodiment of the present invention includes the following step 31, step 32 and step 33.

  In step 31, the network side acquires channel quality parameter measurement values in all cells on all carriers of all base stations measured by the user equipment.

  In the carrier aggregation system, the channel quality parameter of any cell measured by the user equipment has a one-to-one correspondence with any cell on any carrier of any base station, that is, one channel quality parameter corresponds to one base. It uniquely corresponds to a station, one carrier, and one cell. Taking FIG. 1 as an example, if the carrier aggregation system shown in FIG. 1 is disassembled by a carrier and a base station, an exploded view shown in FIG. 2 is obtained. FIG. 2 shows that base stations 1 to 3 perform carrier aggregation in carriers CC1 and CC2, respectively, and each base station has three cells in each carrier, and the channel quality parameter measurement value depends on the user equipment The channel quality parameter of any of the measured cells, and in step 32, the correction amount corresponding to the channel quality parameter measurement value is identified based on at least the carrier frequency corresponding to the channel quality parameter measurement value, and the correction amount Is used to correct the corresponding channel quality parameter measurement value, and the higher the carrier frequency corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value.

  In step 33, the maximum value is selected from the corrected channel quality parameter measurement values, and the cell corresponding to the corrected channel quality parameter measurement value having the maximum value is arranged in the primary cell of the user equipment.

  In a specific embodiment of the present invention, the channel quality parameter is a reference signal receiving power (RSRP).

  In a specific embodiment of the present invention, the correction amount corresponding to the channel quality parameter measurement value can be specified based only on the carrier frequency corresponding to the channel quality parameter measurement value. This will be explained as follows.

The correspondence relationship is stored in advance by associating the carrier frequency with the correction amount. Taking the carrier frequency as 800 MHz, 2 GHz, and 3.5 GHz, for example, the correspondence between the carrier frequency and the correction amount is shown as follows.

In the above table, there is a relationship of offset ₀₀ <offset ₁₀ <offset ₂₀ , that is, the higher the carrier frequency, the larger the corresponding correction amount.

As an example, the carrier frequencies are 800 MHz and 2 GHz, respectively. Assume that the following RSRP values are measured by user equipment.
RSRP11: channel quality parameter measurement value of cell on carrier 1 (800 MHz) of base station 1 measured by user equipment RSRP12: channel quality parameter measurement value of cell on carrier 2 (2 GHz) of base station 1 measured by user equipment RSRP21: Channel quality parameter measurement value of cell on carrier 1 (800 MHz) of base station 2 measured by user equipment RSRP22: Channel quality parameter measurement value of cell on carrier 2 (2 GHz) of base station 2 measured by user equipment RSRP31: Channel quality parameter measurement of cell on carrier 1 (800 MHz) of base station 3 measured by user equipment RSRP32: Channel quality parameter measurement of cell on carrier 2 (2 GHz) of base station 3 measured by user equipment

  If the contents of the prior art are used, the network side equipment directly compares RSRP11, RSRP12,..., RSRP32, and places the cell corresponding to the maximum value among RSRP11 to RSRP32 in the primary cell of the user equipment.

However, in the above technical proposal, only RSRP itself is considered, and other factors are not considered. However, in a specific embodiment of the present invention, after obtaining a series of measured values of RSRP11, RSRP12,..., RSRP32, the measured values are corrected based on the carrier frequency. The corrected RSRP measurement value is as follows.
RSRP11 + offset _00, RSRP12 + offset ₁₀ , RSRP21 + offset ₀₀ , RSRP22 + offset ₁₀ , RSRP31 + offset ₀₀ , RSRP32 + offset ₁₀ .

Then, the maximum value is selected from the corrected RSRP measurement value sequence. When RSRP22 + offset is ₁₀ , for example, a cell corresponding to RSRP22 (cell on carrier 2 of base station 2) is arranged in the primary cell.

  In the carrier aggregation system shown in FIG. 1, when the primary cell is determined considering only the RSRP measurement value, the following may occur. When a large number of terminals discover that the RSRP of cell A is larger than the RSRP of another cell B, these terminals select the carrier of cell A as the primary component carrier, regardless of the small difference in actual RSRP. That is, a large number of terminals access the carrier of the cell A, and the load on the cell A increases. On the other hand, there is no terminal that accesses the carrier of the cell B, and the load is small. To avoid this, step 32 is performed as follows in a specific embodiment of the present invention.

  Based on the carrier frequency corresponding to the channel quality parameter measurement value and the cell load corresponding to the channel quality parameter measurement value, the correction amount corresponding to the channel quality parameter measurement value is specified, and the corresponding channel using the above correction amount As the carrier frequency corresponding to the channel quality parameter measurement value is corrected and the correction amount corresponding to the channel quality parameter measurement value is increased, the cell load corresponding to the channel quality parameter measurement value is increased. The smaller the value, the larger the correction amount corresponding to the channel quality parameter measurement value, and the above method increases the possibility that the cell carrier with a low load is selected as the primary component carrier by the terminal, and balances the cell load. Is planned.

  This will be described in detail as follows.

The carrier frequency, cell load, and correction amount are associated in advance and the corresponding relationship is stored. Taking the case where the carrier frequencies are 800 MHz and 2 GHz, for example, the correspondence is shown as follows.

  In the above correspondence relationship, the load on the base station is divided into four levels, but of course, the load on the base station can be divided into more levels for more accurate control.

The table has the following relationship.
offset ₀₀ <offset ₁₀ <offset ₂₀ , offset ₀₁ <offset ₁₁ <offset ₂₁ , offset ₀₂ <offset ₁₂ <offset ₂₂ , offset ₀₃ <offset ₁₃ <offset ₂₃ ,
offset ₀₀ <offset ₀₁ <offset ₀₂ <offset ₀₃ , offset ₁₀ <offset ₁₁ <offset ₁₂ <offset ₁₃ , offset ₂₀ <offset ₂₁ <offset ₂₂ <offset ₂₃ .

As an example, the carrier frequencies are 800 MHz and 2 GHz, respectively. Assume that the following RSRP values are measured by user equipment.
RSRP11: channel quality parameter measurement value of cell on carrier 1 (800 MHz) of base station 1 measured by user equipment RSRP12: channel quality parameter measurement value of cell on carrier 2 (2 GHz) of base station 1 measured by user equipment RSRP21: Channel quality parameter measurement value of cell on carrier 1 (800 MHz) of base station 2 measured by user equipment RSRP22: Channel quality parameter measurement value of cell on carrier 2 (2 GHz) of base station 2 measured by user equipment RSRP31: Channel quality parameter measurement of cell on carrier 1 (800 MHz) of base station 3 measured by user equipment RSRP32: Channel quality parameter measurement of cell on carrier 2 (2 GHz) of base station 3 measured by user equipment

  If the contents of the prior art are used, the network side equipment directly compares RSRP11, RSRP12,..., RSRP32, and places the cell corresponding to the maximum value among RSRP11 to RSRP32 in the primary cell of the user equipment.

However, in the above technical proposal, only RSRP itself is considered, and other factors are not considered. However, in a specific embodiment of the present invention, after obtaining a series of measured values of RSRP11, RSRP12,..., RSRP32, the measured values are corrected based on the carrier frequency and load. When the cell loads corresponding to RSRP11, RSRP12,..., RSRP32 are 25%, 35%, 45%, 55%, 65%, 75%, and 85%, the corrected RSRP measurement values are as follows: Become.
RSRP11 + offset _00, RSRP12 + offset ₁₁ , RSRP21 + offset ₀₁ , RSRP22 + offset ₁₂ , RSRP31 + offset ₀₃ , RSRP32 + offset ₁₃ .

Then, the maximum value is selected from the corrected RSRP measurement value sequence. When RSRP22 + offset ₁₂ , for example, a cell corresponding to RSRP22 (cell on carrier 2 of base station 2) is arranged in the primary cell.

  With the above method, it is possible to increase the possibility that a carrier of a cell with a low load is selected as a primary component carrier by the terminal, balance the cell load, and improve the user experience speed.

  After selecting the primary cell, it is necessary to continue to select the secondary cell. In a specific embodiment of the present invention, the secondary cell can be selected using the corrected channel quality parameter measurement according to the conventional method.

  When employing the relative value method, it is necessary to set a threshold value in order to acquire a secondary cell. Specifically, the following steps are included.

  1. Acquire a secondary cell candidate set. All cells in the secondary cell candidate set belong to the serving base station, and the sum of the corrected channel quality parameter measurement value and the subscription threshold value of each cell in the secondary cell candidate set is the primary cell. It is equal to or greater than the corrected channel quality parameter measurement value corresponding to.

  2. Of the cells corresponding to each component carrier, the deletion operation is performed on the secondary cell candidate set so as to hold only the cell with the maximum channel quality parameter measurement value after correction.

  3. A part or all of the cells in the secondary cell candidate set after execution of the deletion operation are arranged in the secondary cell of the user equipment.

  When the relative value method is adopted, it is necessary to set another threshold value in order to delete the secondary cell. Specifically, the following steps are included.

  1. It is determined whether the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell.

  2. If the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, The delete operation is executed so as not to place the secondary cell.

  In a specific embodiment of the present invention, the load on the base station should be taken into account in order to ensure a load balance. When the load on the base station is relatively large, as many secondary cells as possible should be arranged in the user equipment, and / or the number of deletions of existing secondary cells in the user equipment should be as small as possible. Of course, when the load on the base station is relatively small, a small number of secondary cells may be arranged in the user equipment, and / or the number of existing secondary cells deleted from the user equipment may be increased. Based on the above reasons, in the specific embodiment of the present invention, when acquiring the secondary cell candidate set, the subscription threshold is further specified based on the load of the service base station, and the load on the service base station increases. When determining whether the sum of the channel quality parameter measurement value after correction of the existing secondary cell and the deletion threshold value is smaller than the channel value parameter measurement value after correction corresponding to the primary cell, the subscription threshold value becomes small Further, the deletion threshold is specified based on the load of the service base station, and the deletion threshold increases as the load of the service base station increases.

  The cell management apparatus in the carrier aggregation environment according to the embodiment of the present invention includes the following measurement value acquisition module, correction module, and first arrangement module.

  The measurement value acquisition module acquires channel quality parameter measurement values in all cells on all carriers of all base stations measured by user equipment.

  The correction module identifies a correction amount corresponding to the channel quality parameter measurement value based on at least the carrier frequency corresponding to the channel quality parameter measurement value, and corrects the corresponding channel quality parameter measurement value using the correction amount. . The higher the carrier frequency corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value.

  The first placement module selects the maximum value from the corrected channel quality parameter measurement value, and places the cell corresponding to the corrected channel quality parameter measurement value having the maximum value in the primary cell of the user equipment.

  However, the correction module specifies the correction amount corresponding to the channel quality parameter measurement value based on the carrier frequency corresponding to the channel quality parameter measurement value and the cell load corresponding to the channel quality parameter measurement value, and corrects the correction. The corresponding channel quality parameter measurement value is corrected using the amount, and the smaller the cell load corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value.

  The management apparatus further includes a set acquisition module, a first deletion module, and a second arrangement module described below.

  The set acquisition module acquires a secondary cell candidate set, but all cells in the secondary cell candidate set belong to the same base station as the primary cell, and the corrected channel quality of each cell in the secondary cell candidate set The sum of the parameter measurement value and the subscription threshold is equal to or greater than the corrected channel quality parameter measurement value corresponding to the primary cell.

  The first deletion module performs a deletion operation on the secondary cell candidate set so as to hold only the cell having the maximum corrected channel quality parameter measurement value in the cell corresponding to each carrier.

  A 2nd arrangement | positioning module arrange | positions a part or all of the cell in the secondary cell candidate set after said deletion operation execution to the secondary cell of the said user equipment.

  The management device further includes a determination module and a second deletion module described below.

  The determination module determines whether the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value of the primary cell.

  The second deletion module, when the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, The deletion operation is executed so that the existing secondary cell is not placed in the cell.

  The subscription threshold is determined by the load on the service base station. The greater the load on the service base station, the smaller the subscription threshold.

  The deletion threshold is determined by the load on the service base station, and the deletion threshold increases as the load on the service base station increases.

  In a specific embodiment of the present invention, the correction amount of the channel quality parameter measurement value and the addition threshold value and the deletion threshold value at different loads are related to the correction amount and the threshold value. It can be stored and can be searched and used directly in the process of use. Hereinafter, acquisition of the correction amount will be described in detail as an example.

<Acquisition method 1: outer layer circulation method>
Based on feedback from the user regarding the experience speed and information such as the current frequency point, load, etc., when the base station is turned on, adaptive adjustments are made to the default parameters, and the obtained optimum values are stored. For future use.

  If it is found that the experience speed fed back from the user decreases, the previous correction amount is corrected and adjusted in the opposite direction (for example, the direction of increasing), and the experience speed fed back from the user next time is improved. If it finds, it will continue to adjust in the opposite direction (increase direction), and if it finds that the experience speed fed back from the user decreases, it will change the direction (decrease direction), but at the same time the adjustment step length It is necessary to adjust it by lowering it, it circulates according to this, iterates until the change in the experience speed fed back from the user becomes smaller than the threshold value, stops adjusting after it becomes smaller than the threshold value, and stores the last parameter To do.

  The above method needs to be tested in an actual environment, and there is a possibility that the load and frequency points are always satisfied. Therefore, the acquisition method 2 can be used for acquisition.

<Acquisition method 2: Acquire by simulation>
First, create a simulation environment. The creation of the simulation environment can be realized by a large amount of simulation software at present and is common knowledge for those skilled in the art, and therefore will not be described in detail here.

  Then, each type of different parameter value is substituted into the simulation environment to perform simulation and record the optimum performance.

  Finally, the parameters corresponding to the optimum performance are selected and stored, and applied to the actual system.

In order to guarantee accuracy, for example, for the following table, a threshold interval is set, and then divided equally, and finally combined to obtain many tables. Each table performs a simulation, Finally, an optimal combination can be obtained. Of course, it is conceivable to set the offset adjustment step length as finely as possible in order to achieve the optimum performance.

When all the offset sections [A, B] are divided into 10 equal parts, 10 ¹² experiments are required to obtain the optimum value of the above table. Although the number of experiments is large, a simulation that is repeatedly performed in this way may be automatically executed by a computer and does not become difficult. Therefore, a large number of experiments does not become an obstacle to obtaining optimum parameters.

  Regarding the setting of the section [A, B], when the section is not specified first, the upper limit B may be set larger. For example, it may be set larger than the conventional maximum RSRP measurement value.

  Hereinafter, the beneficial effect of the embodiment of the present invention will be proved through simulation.

The simulation parameters are shown as follows.

The relationship between the correction amount, frequency, and load is shown in the following table.

The relationship between the subscription threshold / deletion threshold and the load is shown in the following table.

  Of course, the relationship between the correction amount, the frequency, and the load, and the relationship between the addition threshold / deletion threshold and the load are for simulation, and the relationship between the values in the two tables is the correction amount and the frequency. There is no limitation on the relationship between the loads or the relationship between the subscription threshold / deletion threshold and the load.

  In FIG. 4, the antenna angle of carrier 1 (800 MHz) and the antenna angle of carrier 2 (2 GHz) are the same, but the coverage is not completely identical (scene 2), and the transmission bandwidth of carrier 1 is 10 MHz. The simulation result when the transmission bandwidth of the carrier 2 is 10 MHz is shown. As shown in FIG. 4, the average throughput of the user equipment using the method of the embodiment of the present invention is almost the same as the average throughput of the user equipment in the joint scheduling method, but the conventional measurement value is not corrected. It can be seen that the average throughput of the user equipment has increased by at least 100% compared to the method.

  In FIG. 5, the antenna angle of carrier 1 (800 MHz) and the antenna angle of carrier 2 (2 GHz) are different (scene 3), the transmission bandwidth of carrier 1 is 10 MHz, and the transmission bandwidth of carrier 2 is 10 MHz. The simulation result is shown. As shown in FIG. 5, the average throughput of the user equipment using the method of the embodiment of the present invention is almost the same as the average throughput of the user equipment in the joint scheduling method, but the conventional measurement value is not corrected. Compared to the method, it can be seen that the average throughput of the user equipment is obviously increased, and especially when the number of users is relatively small, the increase of the average throughput of the user equipment is obvious.

  From the above simulation results, according to the method of the embodiment of the present invention, the average throughput of the user equipment basically reaches the maximum value (average throughput of the user equipment in the joint scheduling method) in each type of scene. Although it was possible, it was proved that the average throughput of the user equipment is clearly increased compared to the prior art without correction of the measured values and no compensation of the threshold.

  The above is only a preferred implementation mode of the present invention. For general engineers in the field, some modifications and modifications are possible on the premise that the principle of the present invention is not deviated. However, it will be understood that these modifications and modifications are also within the protection scope of the present invention.

Claims (12)

In a cell management method in a carrier aggregation environment, obtaining a channel quality parameter measurement value in all cells on all carriers of all base stations measured by user equipment; and
Identifying a correction amount corresponding to the channel quality parameter measurement value based on at least the carrier frequency corresponding to the channel quality parameter measurement value, and correcting the corresponding channel quality parameter measurement value using the correction amount; and
However, the higher the carrier frequency corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value,
Selecting a maximum value from the corrected channel quality parameter measurement value and placing a cell corresponding to the corrected channel quality parameter measurement value having the maximum value in the primary cell of the user equipment; and
The management method characterized by including. In step B above,
The correction amount is specified based on the carrier frequency corresponding to the channel quality parameter measurement value and the cell load corresponding to the channel quality parameter measurement value, and the corresponding channel quality parameter measurement value is corrected using the correction amount. ,
However, the management method according to claim 1, wherein the correction amount corresponding to the channel quality parameter measurement value increases as the cell load corresponding to the channel quality parameter measurement value decreases. Step D for acquiring a secondary cell candidate set;
However, all the cells in the secondary cell candidate set belong to the same base station as the primary cell, and the sum of the corrected channel quality parameter measurement value and the subscription threshold of each cell in the secondary cell candidate set is the primary cell Greater than or equal to the corrected channel quality parameter measurement corresponding to the cell,
Performing a delete operation on the secondary cell candidate set so as to hold only the cell with the largest channel quality parameter measurement value after correction in the cell corresponding to each carrier; and
Arranging a part or all of the cells in the secondary cell candidate set after execution of the deletion operation in the secondary cell of the user equipment,
The management method according to claim 1, further comprising: Determining whether the sum of the corrected channel quality parameter measurement value of the existing secondary cell of the user equipment and the deletion threshold is smaller than the corrected channel quality parameter measurement value of the primary cell; and
If the sum of the corrected channel quality parameter measurement value and the deletion threshold value of the existing secondary cell of the user equipment is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, the existing secondary cell is set as the secondary of the user equipment. Step H for executing a delete operation so as not to be a cell;
The management method according to claim 3, further comprising:   5. The management method according to claim 4, wherein, in step D, the subscription threshold is determined by a load of a service base station, and the subscription threshold decreases as the load of the service base station increases.   5. The management method according to claim 4, wherein in the step H, the deletion threshold is determined by a load of a service base station, and the deletion threshold increases as the load of the service base station increases. In a cell management device in a carrier aggregation environment,
A measurement value acquisition module for acquiring channel quality parameter measurement values in all cells on all carriers of all base stations measured by user equipment;
A correction module for identifying a correction amount corresponding to the channel quality parameter measurement value based on at least a carrier frequency corresponding to the channel quality parameter measurement value, and correcting the corresponding channel quality parameter measurement value using the correction amount;
However, the higher the carrier frequency corresponding to the channel quality parameter measurement value, the larger the correction amount corresponding to the channel quality parameter measurement value,
A first placement module that selects a maximum value from the corrected channel quality parameter measurement value and places a cell corresponding to the corrected channel quality parameter measurement value having the maximum value in the primary cell of the user equipment;
A management device comprising: The correction module identifies the correction amount corresponding to the channel quality parameter measurement value based on the carrier frequency corresponding to the channel quality parameter measurement value and the cell load corresponding to the channel quality parameter measurement value, and determines the correction amount. Use to correct the corresponding channel quality parameter measurement,
8. The management apparatus according to claim 7, wherein the correction amount corresponding to the channel quality parameter measurement value increases as the cell load corresponding to the channel quality parameter measurement value decreases. A set acquisition module for acquiring a secondary cell candidate set;
However, all the cells in the secondary cell candidate set belong to the same base station as the primary cell, and the sum of the corrected channel quality parameter measurement value and the subscription threshold of each cell in the secondary cell candidate set is the primary cell Greater than or equal to the corrected channel quality parameter measurement corresponding to the cell,
A first deletion module that performs a deletion operation on the secondary cell candidate set so as to hold only the cell with the largest channel quality parameter measurement value after correction in the cell corresponding to each carrier;
A second placement module for placing a part or all of the cells in the secondary cell candidate set after execution of the deletion operation in the secondary cell of the user equipment;
The management device according to claim 7, further comprising: A determination module that determines whether the sum of the channel quality parameter measurement value after correction of the existing secondary cell of the user equipment and the deletion threshold is smaller than the channel quality parameter measurement value after correction of the primary cell;
If the sum of the corrected channel quality parameter measurement value and the deletion threshold value of the existing secondary cell of the user equipment is smaller than the corrected channel quality parameter measurement value corresponding to the primary cell, the existing secondary cell is set as the secondary of the user equipment. A second delete module that executes a delete operation so as not to be a cell;
The management apparatus according to claim 9, further comprising:   11. The management apparatus according to claim 10, wherein the subscription threshold is determined by a load of a service base station, and the subscription threshold decreases as the load of the service base station increases.   11. The management apparatus according to claim 10, wherein the deletion threshold is determined by a load of a service base station, and the deletion threshold increases as the load of the service base station increases.

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