JP6538313B2 - Interference adjustment method and base station - Google Patents

Description

  The present application relates to the field of mobile communication technology, and in particular, to an interference coordination method and base station in a small cell environment.

  Cellular mobile phones are extremely useful for people's communication. The 3rd Generation Partnership Project (3GPP), as a key organization in the field of mobile communications, will greatly accelerate the progress of standardization of the 3rd generation mobile communications technology (3G: The Third Generation). In order to address the challenges of broadband access technology and to meet the growing demand for new services, 3GPP has been working on the standardization of Long Term Evolution (LTE) technology from 3G from the end of 2004. By having it started, the spectrum efficiency is further improved, the performance of the cell edge user is improved, the system delay is reduced, and the higher speed access service is provided to the high speed mobile user. The improved LTE (LTE-A: LTE-Advanced) technology is also based on LTE technology to increase the spectrum bandwidth several times, improve the data rate several times and add more mobile users. Provide services that are faster and have better performance.

  For example, in addition to the macro cell (Macro Cell) in the traffic congestion area, the provision of Release 12 (Rel-12) of 3GPP in order to improve the network capacity of the traffic congestion area such as a gymnasium and a shopping center etc. Small cells are arranged, and these small cells can bear most of the data traffic. By placing small cells in a high traffic area, network capacity can be greatly improved, but at the same time, as the density of small cells increases, interference between small cells also significantly increases, which in turn, increases network capacity. Improvement is limited.

  To solve the above problems, the embodiments of the present invention provide an interference coordination method and a base station for performing the method, and by applying to a small cell environment, reduce interference between small cells, and a network Improve capacity.

  The interference adjustment method provided in the embodiment of the present invention selects a primary secondary component cell (Pscell) from secondary component cells (Scell) in the network, and sets another Scell as a secondary secondary component cell (Sscell). Determining and selecting a serving Pscell of the UE based on a first received signal quality parameter of the UE when the user terminal (UE) accesses, and based on a second received signal quality parameter of the UE; Determining if it is necessary to add a serving Sscell to the UE.

  Here, selecting Pscell from among Scells in the network is such that the macrocell base station minimizes interference between the selected adjacent Pscell based on the information of the position and frequency band of each Scell. Select, including.

  Alternatively, the small cell base station monitors the signal strength from the adjacent Scell in real time, and determines the interference status from the adjacent Scell, and the Pscell is selected at the local station by selecting Pscell from the Scells in the network. And selecting, as a Pscell, a Scell with which the interference received from the adjacent Scell is minimum, from among the corresponding Scells of the own station based on the interference status from the adjacent Scell.

  Alternatively, to select Pscell from among Scells in the network, the small cell base station can set information on the Scell corresponding to the adjacent small cell base station and the adjacent small cell base by exchanging information between the adjacent small cell base stations. The information on the Pscell selected by the station is acquired, and based on the setting information on the Scell corresponding to the adjacent small cell base station and the information on the Pscell selected by the adjacent small cell base station, among the Scell corresponding to the own station Selecting a Scell that minimizes interference received from an adjacent Scell as a Pscell.

  The first received signal quality parameter of the UE includes the reference signal received quality (RSRQ) of each Pscell received by the UE, wherein selecting the serving Pscell of the UE causes the UE to determine the RSRQ of each Pscell around it. After receiving, it is determined whether the RSRQ of each received Pscell around is greater than a preset RSRQ threshold, and if there is only one Pscell where RSRQ is greater than the preset RSRQ threshold, If Pscell is selected as the serving Pscell of the UE, and there are multiple Pscells whose RSRQ is greater than the preset RSRQ threshold, the Pscell with the largest RSRQ is selected as the serving Pscell of the UE. Including.

  The first received signal quality parameter of the UE includes the reference signal received power (RSRP) of each Pscell received by the UE, wherein selecting the serving Pscell of the UE causes the UE to select the RSRP of each Pscell around it. After receiving, it is determined whether the RSRP of each Pscell around received is larger than the preset RSRP threshold, and if there is only one Pscell where the RSRP is larger than the preset RSRP threshold, If Pscell is selected as the serving Pscell of the UE, and there are a plurality of Pscells whose RSRP is larger than a preset RSRP threshold, the Pscell with the largest RSRP is selected as the serving Pscell of the UE. Including.

  Alternatively, selecting the serving Pscell of the UE calculates the difference between the RSRP of the received Pcell and the RSRP of each Pscell after the UE receives the RSRP of the Pscell and the RSRP of the Pcell of the surrounding Pscell. It is determined whether the difference is smaller than the preset offset, and if there is only one difference smaller than the preset offset, Pscell corresponding to this difference is set as the serving Pscell of the UE. When there are a plurality of differences smaller than the preset offset, it is selected to select, as the serving Pscell of the UE, the Pscell for which RSRP is the largest among the Pscells corresponding to these differences.

  The second received signal quality parameter of the UE may comprise the reference signal received quality (RSRQ) of each Sscell received by the UE, wherein determining whether it is necessary to add a serving Sscell to the UE Respectively determines whether the RSRQ of each received Sscell is greater than a preset second RSRQ threshold after the UE receives the RSRQ of each Sscell, and the RSRQ of the received Sscell is preset If it is larger than the second RSRQ threshold, the Sscell is added as a serving Sscell, and it is determined that it is not necessary to add the serving Sscell if there is no Sscell whose RSRQ is larger than the second RSRQ threshold set in advance. , Including.

  The above method determines whether or not the small cell base station activates Sscell based on whether or not there is a UE that accesses Sscell, and when there is a UE that accesses Sscell, activates Sscell and then switches Sscell to Sscell. It further includes not activating Sscell if there is no UE to access.

  The macro cell base station provided in the embodiment of the present invention selects a primary secondary component cell (Pscell) from among the Scell based on the arrangement information of the secondary component cell (Scell) within the coverage of the own station. , And another Scell as a secondary-secondary component cell (Sscell), and the Pscell determination means for notifying the Scell of the selection result and the first received signal quality parameter of the UE when the user terminal (UE) accesses Pscell setting means for selecting the serving Pscell of the UE and notifying the UE based on the UE, and when the user terminal (UE) accesses the UE, based on the second received signal quality parameter of the UE Add Serving Sscell to To determine whether there is a need, including a Sscell setting means for notifying the UE.

  Another macro cell base station provided in the embodiment of the present invention receives the configuration information of the primary / secondary component cell (Pscell) reported from each small cell base station within the coverage of its own station, and Based on the first received signal quality parameter of the UE when the user terminal (UE) accesses the configuration information receiving means for determining Pscell and secondary secondary component cell (Sscell) within the coverage, the serving Pscell of the UE Need to add a serving Sscell to the UE based on the second received signal quality parameter of the UE when Pscell setting means for notifying the UE and notifying the UE and the user terminal (UE) accesses To determine whether there is a Sscell to notify the UE Including a constant means.

  The small cell base station provided in the embodiment of the present invention selects a primary secondary component cell (Pscell) from among the corresponding secondary component cells (Scell) of the own station, and the other Scell corresponding to the own station. Selecting a serving Pscell of the UE based on a first received signal quality parameter of the UE when the user terminal (UE) accesses, and a second Pscell determining means for determining the secondary secondary component cell (Sscell) as the secondary secondary component cell (Sscell); And if the user terminal (UE) accesses the Pscell setting means for notifying the UE and whether it is necessary to add a serving Sscell to the UE based on the second received signal quality parameter of the UE Determine whether to notify the UE Including a cell setting means.

  Here, the second Pscell determination means monitors the signal strength from the adjacent Scell in real time and determines the interference status from the adjacent Scell, and the interference status from the adjacent Scell determined in the own station. And a Pscell selection module for selecting, as a Pscell, a Scell that minimizes interference received from an adjacent Scell among the corresponding Scells of the own station.

  Alternatively, the second Pscell determination means acquires the setting information of the Scell corresponding to the adjacent base station and the information of the Pscell selected by the adjacent base station by the information exchange between the adjacent base stations, and the adjacent base station. Pscell that selects, as Pscell, the Scell with which the interference received from the adjacent Scell is the smallest among the corresponding Scell of the own station based on the setting information of the Scell corresponding to the station and the information of Pscell selected by the adjacent base station And a selection module.

  The small cell base station described above determines whether to activate Sscell based on whether there is a UE accessing Sscell, and when there is a UE accessing Sscell, activates the Sscell and UE accesses the Sscell If there is not, it may further include an Sscell activation module that does not activate Sscell.

  As can be seen from the above example, the above method aims to minimize interference between Pscells in determining Pscell, so to reduce interference between small cells and improve network capacity. Can.

FIG. 1 shows a conventional network configuration with a small cell arrangement. FIG. 5 is a diagram illustrating another conventional network configuration having a small cell arrangement. 5 is a flowchart of an interference adjustment method according to an embodiment of the present invention. It is a figure which shows the structure of the macrocell base station which concerns on one Example of this invention. It is a figure which shows the structure of the macrocell base station which concerns on the other Example of this invention. It is a figure which shows the structure of the small cell base station which concerns on one Example of this invention.

  FIG. 1 is a diagram showing a conventional network configuration having a small cell arrangement. Usually, in the 3GPP, a macro cell is called a primary component cell or a primary cell (P cell: Primary Cell), and one or more small cells within the coverage of the macro cell are secondary component cells or secondary cells ( It is called Scell: Secondary Cell). As shown in FIG. 1, a plurality of small cells which are Scell 1, Scell 2, Scell 3, Scell 4, Scell 5 and Scell 6 are simultaneously disposed within the coverage of one macro cell Pcell. Here, each Scell corresponds to one component carrier (CC: Component Carrier). For example, Scell 1, Scell 2 and Scell 3 correspond to CC0, and Scell 4, Scell 5 and Scell 6 correspond to CC1. Do. Because each CC is orthogonal, one location in the network may simultaneously be within the coverage of multiple Scells corresponding to different CCs. For example, in FIG. 1, user UE1 is simultaneously within the coverage of Scell 2 and Scell 5. In FIG. 1, BSa1 is a macro cell base station or primary component cell base station, and BSb1, BSb2 and BSb3 are small cell base stations or secondary component cell base stations.

  FIG. 2 is a diagram showing another conventional network configuration having a small cell arrangement. In the network configuration shown in FIG. 2, although the macro cell Pcell is not arranged, only a plurality of small cells which are Scell 1, Scell 2, Scell 3, Scell 4, Scell 5 and Scell 6 are arranged. Similarly, each Scell in it corresponds to one CC, for example, Scell 1, Scell 2 and Scell 3 correspond to CC0, and Scell 4, Scell 5 and Scell 6 correspond to CC1. Similarly, since the CCs are orthogonal to each other, the user UE1 in FIG. 2 may simultaneously be within the coverage of Scell 2 and Scell 5. In FIG. 2, BSb1, BSb2 and BSb3 are small cell base stations or secondary component cell base stations.

  In the network configuration shown in FIG. 1 or FIG. 2 described above, in the case where the Scells are arranged densely, the present invention solves the problem that the improvement of the network capacity is limited by the increase of interference between the Scells. The example of provides an interference coordination method in a small cell environment. As shown in FIG. 3, the specific flow of the method mainly includes the following steps.

  In step 301, Pscell is selected from among Scells in the network so as to minimize interference between adjacent primary Scells (Pscell: Primary Scell), and other Scell is determined as a secondary Scell (Sscell: Secondary Scell). .

  In step 302, when the UE accesses, a serving Pscell of the UE is selected based on a first received signal quality parameter of the UE.

  In step 303, based on the second received signal quality parameter of the UE, it is determined whether it is necessary to add a serving Sscell to the UE.

  Specifically, the above step 301 should aim to minimize the interference between Pscells, that is, the Pscell selected from among the Scells has the least interference between adjacent Pscells. You should be as satisfied as possible. In practical applications, the choice of Pscell may be realized in one of the following ways.

  Method 1 is for the macrocell base station to complete the selection of Pscell, which is applied to the network configuration shown in FIG.

  When the placement of Scells is completed, usually, the macrocell base station can obtain the placement information of all Scells in the coverage of the own station, that is, the location information and frequency band information of each Scell. In this case, the macro cell base station may select Pscell based on the information of the position and frequency band of each Scell. For example, the macrocell base station may select Scell corresponding to a different frequency band as adjacent Pscell as much as possible between adjacent Scells by the method shown in the conventional drawing. This minimizes the interference between selected adjacent Pscells by utilizing orthogonality between different frequency bands.

  For example, in the network configuration shown in FIG. 1, there are a total of six Scells within the coverage of Pcell. Here, Scell 1, Scell 2 and Scell 3 correspond to CC0, and Scell 4, Scell 5 and Scell 6 correspond to CC1. In such a case, BSa1 may select Scell 1, Scell 5 and Scell 6 as Pscell. Since Scell 1 and Scell 5 and Scell 6 correspond to different CCs, the interference between Scell 1 and Scell 5 and Scell 6 is not large.

  Method 2 is adopted when the small cell base station has a downlink receiver, and the method is applied to the network configuration shown in FIG. 1 and FIG.

  Usually, in a small cell network environment, one small cell base station can use a plurality of frequency bands, and each frequency band corresponds to one Scell, ie, a secondary component cell or a secondary cell. That is, one small cell base station corresponds to a plurality of Scells. When the small cell base station has a downlink receiver, the small cell base station can determine the interference status from the adjacent Scell by monitoring the signal strength from the adjacent Scell in real time. In such a case, the small cell base station minimizes the interference received from the adjacent Scell among the corresponding Scell of the own station based on the interference status from the adjacent Scell determined by the own station. Scell may be selected as Pscell.

  For example, in the network configuration shown in FIG. 1, the small cell base station BSb1 uses two frequency bands, and the two frequency bands correspond to Scell 1 and Scell 4 respectively, and the small cell base station The interference situation from the adjacent Scell is determined by monitoring the signal strength from the adjacent Scell (for example, Scell 2, Scell 3, Scell 5 and Scell 6) in real time. If it can be determined that the interference received from Scell 2, Scell 3, Scell 5 and Scell 6 of Scell 1 is smaller than the interference received from Scell 2, Scell 3, Scell 5 and Scell 6 of Scell 4, Scell 1 is selected as Pscell Do. In the same manner, the small cell base station BSb2 corresponding to Scell 2 and Scell 5 may select Scell 5 as Pscell, and the small cell base station BSb3 corresponding to Scell 3 and Scell 6 may select Scell 6 as Pscell. It may be selected as

  For Method 3, the method applies to the network configuration shown in FIGS. 1 and 2.

  When the small cell base station does not have a downlink receiver, configuration information of the Scell corresponding to the adjacent small cell base station and the adjacent small cell base station by exchanging information between the base stations between the adjacent small cell base stations. It is possible to obtain information of Pscell selected. As a result, among the corresponding Scells of the own station, the Scell with which the interference received from the adjacent Scell is minimized is selected as Pscell.

  For example, in the network configuration shown in FIG. 1, the small cell base station BSb1 uses two frequency bands, and these two frequency bands correspond to Scell 1 and Scell 4, respectively. In the small cell base station, the adjacent small cell base station BSb2 selects Scell 5 as Pscell by exchanging information with the adjacent base station, and the CC corresponding to Scell 5 is CC1, and the other adjacent small cell base station BSb3 Selects Scell 6 as Pscell, and acquires that CC corresponding to Scell 6 is also CC1. Then, based on the result of the information exchange, the base station can determine that the Pscell corresponding to the own station is Scell 1 so as to minimize interference between adjacent Pscels.

  In step 302 above, the first received signal quality parameter of the UE may specifically be reference signal received power (RSRP) or reference signal received quality (RSRQ) of each Pscell received by the UE. Specifically, in step 302, when the UE accesses the UE, the serving Pscell of the UE may be selected by the following three methods.

  In Method 1, the determination is made based on the RSRQ of each Pscell received by the UE.

  After receiving the RSRQ of each surrounding Pscell, the UE first determines whether the RSRQ of each received surrounding Pscell is greater than a preset RSRQ threshold, and the RSRQ is greater than the preset RSRQ threshold. When there is only one large Pscell, the Pscell is selected as the serving Pscell of the UE, and when there are multiple Pscells whose RSRQ is larger than the preset RSRQ threshold, RSRQ is selected from among them. The largest Pscell is selected as the serving Pscell of the UE.

  For example, after the UE1 in FIG. 1 receives the RSRQ of Pscell around Scell1, Scell5 and Scell6, first, the RSRQ of Scell1, Scell5 and Scell6 is larger than the preset RSRQ threshold thre1. Determine if it is. As a result, for example, the RSRQs of Scell 1 and Scell 5 are larger than the preset RSRQ threshold thre1. In such a case, the size of the RSRQs of Scell 1 and Scell 5 is further determined, and since the RSRQ of Scell 5 is larger than the RSRQ of Scell 1, Scell 5 is selected as the serving Pscell of UE1.

  In method 2, the determination is made based on the RSRP of each Pscell received by the UE.

  After receiving the RSRP of each Pscell around, the UE first determines whether the RSRP of each Pscell around received is larger than a preset RSRP threshold, and the RSRP is greater than the preset RSRP threshold When there is only one large Pscell, the Pscell is selected as the serving Pscell of the UE, and when there are multiple Pscells whose RSRP is larger than the preset RSRP threshold, RSRP is selected from among them. The largest Pscell is selected as the serving Pscell of the UE.

  For example, after UE1 in FIG. 1 receives RSRP of surrounding Pscell including Scell 1, Scell 5 and Scell 6, first, RSRP of Scell 1, Scell 5 and Scell 6 is larger than the preset RSRP threshold thre2 Determine if it is. As a result, for example, only the RSRP of Scell 5 is larger than the preset RSRP threshold thre2. In such a case, Scell 5 is directly selected as the serving Pscell of UE1.

  In the method 3, the determination is made based on the RSRP of each Pscell received by the UE, and the method is applied only to the network configuration shown in FIG.

  After receiving the RSRP of each Pscell and the RSRP of Pcell of the surrounding, the UE first calculates the difference between the RSRP of the received Pcell and the RSRP of each of the surrounding Pscell, and the difference is set to a preset offset. It is determined whether it is smaller or not, and if there is only one difference smaller than a preset offset, Pscell corresponding to this difference is selected as the serving Pscell of the UE and smaller than the preset offset When there are a plurality of differences, Pscell with the largest RSRP is selected as the serving Pscell of the UE from among Pscells corresponding to these differences.

  For example, after UE1 in FIG. 2 receives RSRP of Pscell and RSRP of Pcell around Scell 1, Scell 5 and Scell 6, first, RSRP of Pcell, RSRP of Scell 1, Scell 5 and Scell 6, and so on. The respective differences are calculated to determine whether the calculated difference is greater than a preset offset offset. As a result, for example, the difference between RSRP of Pcell and RSRP of Scell 1 and Scell 5 is larger than the preset offset offset. In such a case, the size of RSRP of Scell 1 and Scell 5 is further determined, and since RSRP of Scell 5 is larger than RSRP of Scell 1, Scell 5 is selected as the serving Pscell of UE1.

  In step 303 above, the second received signal quality parameter of the UE may specifically be the reference signal received quality (RSRQ) of each Sscell received by the UE. Specifically, in step 303 described above, it may be determined whether it is necessary to add a serving Sscell to the UE in the following manner.

  After receiving the RSRQ of each Sscell in the surrounding, the UE first determines whether the RSRQ of each Sscell in the received surrounding is greater than a second preset RSRQ threshold, and the Sscell in the received surrounding is received. If the RSRQ of is larger than the preset second RSRQ threshold, the Sscell is added as a serving Sscell of the own station, and if there is no Sscell whose RSRQ is greater than the preset second RSRQ threshold, Determine that it is not necessary to add a serving Sscell.

  For example, after the UE1 in FIG. 1 receives the RSRQ of Sscell around Scell2, Scell3 and Scell4, first, the second RSRQ threshold in which RSRQs of Scell2, Scell3 and Scell 4 are preset is set. Determine if it is greater. As a result, for example, when the RSRQ of Scell 2 is larger than the preset second RSRQ threshold thre3, it is determined to add Scell 2 as a serving Sscell of the UE.

  Also, for example, after the UE 1 in FIG. 1 receives the RSRQs of Sscell around Scell 2 including Scell 3 and Scell 4, firstly, the RSRQs of Scell 2, Scell 3 and Scell 4 are set in advance to the second. Determine if it is greater than the RSRQ threshold. As a result, for example, when there is no Sscell whose RSRQ is larger than the second RSRQ threshold thre3 set in advance, it is determined that it is not necessary to add a serving Sscell.

  The above method may further include the following steps.

  The small cell base station determines whether to activate Sscell based on whether there is a UE accessing Sscell, and if there is a UE accessing Sscell, activates the Sscell and there is no UE accessing Sscell If not, do not start Sscell.

  Corresponding to the above described interference coordination method, the embodiment of the present invention also provides a macro cell base station that implements the above method, the configuration of which is as shown in FIG. The base station selects a Pscell from among these Scells to minimize interference between adjacent Pscells, based on the arrangement information of the Scell within the coverage of the own station, and selects another Scell. Pscell determination means for determining the Sscell as the Sscell and notifying the selection result to the Scell within the coverage of the own station, and the UE's serving Pscell based on the first received signal quality parameter of the UE when the UE accesses It is necessary to add a serving Sscell to the UE based on the second received signal quality parameter of the UE when Pscell setting means for selecting and notifying the UE and when the user terminal (UE) accesses And Sscell setting means for determining whether or not to notify the UE.

  Here, the above Pscell determination means may adopt the method 1 corresponding to the above step 301 to determine Pscell and Sscell. The above Pscell setting means may adopt three methods corresponding to the above step 302 to determine the serving Pscell of the UE. The Sscell setting means may adopt a method corresponding to step 303 above to determine whether it is necessary to add a serving Sscell.

  The embodiment of the present invention also provides another Pcell base station that carries out the above method, the configuration of which is as shown in FIG. The base station mainly receives setting information of Pscell reported from each small cell base station within the coverage of the own station, and setting information receiving means for determining Pscell and Sscell within the coverage of the own station, and , When the UE accesses, Pscell setting means for selecting the serving Pscell of the UE based on the first received signal quality parameter of the UE and notifying the UE, and when the user terminal (UE) accesses And Sscell setting means for determining whether or not it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE, and notifying the UE.

  In this embodiment, the small cell base station within the coverage of the Pcell first adopts the method 2 or the method 3 corresponding to the above step 301 to determine the setting information of the Pscell of its own station, and then the Pcell. It may be made to report to a base station. After this, the above Pscell setting means may adopt three methods corresponding to the above step 302 to determine the serving Pscell of the UE. The Sscell setting means may adopt the method of step 303 above to determine whether it is necessary to add a serving Sscell.

  Corresponding to the above described interference coordination method, the embodiment of the present invention also provides a small cell base station implementing the above method, the configuration of which is as shown in FIG. The base station mainly selects Pscell from among the corresponding Scell of its own station so as to minimize the interference received from the adjacent Pscell, and determines another Scell corresponding to its own station as the Sscell. Pscell determination means for selecting the serving Pscell of the UE based on the first received signal quality parameter of the UE when the UE accesses the Pscell setting means for notifying the UE of the selected Pscell, and the user terminal (UE) And Sscell setting means for determining whether or not it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE when accessing, and notifying the UE.

  Here, the second Pscell determining means may adopt the method 2 or the method 3 corresponding to the step 301 to determine Pscell and Sscell. The above Pscell setting means may adopt three methods corresponding to the above step 302 to determine the serving Pscell of the UE. The Sscell setting means may adopt the method of step 303 above to determine whether it is necessary to add a serving Sscell.

  When the second Pscell determination means adopts method 2 corresponding to step 301, the second Pscell determination means monitors the signal strength from the adjacent Scell in real time and determines the interference status from the adjacent Scell And a Pscell selection module for selecting, as a Pscell, a Scell with which the interference received from the adjacent Scell is minimum, from among the corresponding Scells of the own station based on the interference situation from the adjacent Scell determined by the own station. , May be included.

  When the second Pscell determining means adopts the method 3 corresponding to step 301, the second Pscell determining means determines the configuration information of the Scell corresponding to the adjacent base station and the adjacent base by exchanging information between the adjacent base stations. From among the Scell corresponding to the own station based on the information exchange module for acquiring the information of Pscell selected by the station, the setting information of the Scell corresponding to the adjacent base station, and the information of Pscell selected by the adjacent base station And a Pscell selection module that selects, as Pscell, a Scell that minimizes interference received from an adjacent Scell.

  The above small cell base station further determines whether to activate Sscell based on whether there is a UE accessing Sscell, and when there is a UE accessing Sscell, activates Sscell and accesses Sscell If there is no UE to do, it may include an Sscell activation module that does not activate Sscell.

  As can be seen from the above method and the configuration of the base station, in the process of determining Pscell, the frequency bands of adjacent Pscell are orthogonalized or interference between adjacent Pscell is taken into consideration, with sufficient consideration to the frequency band of adjacent Scell. Interference between adjacent Pscells is greatly reduced, assuring that it is as minimal as possible. At the same time, for UEs with relatively good Sscell reception quality, based on Sscell's received signal quality parameters around the UE, determine Sscell operating in cooperation with the UE's serving Pscell, and determine the user's transmission rate By guaranteeing, the overall network capacity is improved. The following can be found by experimental simulation. That is, according to the method provided in the embodiment of the present invention, the average throughput of the UE can be improved by about 6%.

  Furthermore, in the method according to the embodiment of the present invention, when performing user scheduling, first, the serving Pscell is selected based on the received signal quality parameter of Pscell around the UE, and then, Sscell further around the UE Based on the received signal quality parameter, it may be determined whether it is necessary to add a serving Sscell. This method has relatively small computational complexity as compared to the method of scheduling UEs directly on all Scells. Moreover, when there is no UE accessing Sscell, the small cell base station can reduce the power consumption of the small cell base station by not activating Sscell. Similarly, the following can be found by experimental simulation. That is, according to the method provided in the embodiment of the present invention, the computational complexity of user scheduling can be reduced by about 30%, and the power consumption of the base station can also be reduced by about 30%.

  The above is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention. All modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (15)

Interference adjustment method,
From the secondary component cells (Scell) in the network, select multiple primary secondary component cells (Pscell) and determine other Scell as secondary secondary component cell (Sscell),
When a user terminal (UE) accesses, it selects the serving Pscell of the UE from among each Pscell based on the first received signal quality parameter of the UE,
Determining whether it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE. Selecting multiple Pscell from Scell in the network is
The macro cell base station is characterized in that it includes selecting a plurality of Pscells so as to minimize interference between the selected adjacent Pscell based on the information of the position and frequency band of each Scell. The method according to Item 1. Selecting multiple Pscell from Scell in the network is
Each small cell base station monitors the signal strength from the adjacent Scell in real time, determines the interference status from the adjacent Scell, and based on the interference status from the adjacent Scell determined by the local station, The method according to claim 1, comprising selecting, as a Pscell, a Scell with which the interference received from the adjacent Scell is the smallest, from among the corresponding Scells. Selecting multiple Pscell from Scell in the network is
Each small cell base station acquires setting information of Scell corresponding to the adjacent small cell base station and information of Pscell selected by the adjacent small cell base station by information exchange between adjacent small cell base stations, and an adjacent small cell Based on the configuration information of the Scell corresponding to the base station and the information of the Pscell selected by the adjacent small cell base station, the Scell with which interference from the adjacent Scell is minimized is selected as the Pscell from among the corresponding Scell of the own station. The method of claim 1, comprising: selecting. The first received signal quality parameter of the UE includes reference signal received quality (RSRQ) of each Pscell received by the UE,
Selecting the serving Pscell of the UE
After the UE receives the RSRQ of each Pscell around, it determines whether the RSRQ of each Pscell around received is greater than a preset RSRQ threshold,
If there is only one Pscell in which RSRQ is greater than the preset RSRQ threshold, select that Pscell as the serving Pscell of the UE,
In the case where there are a plurality of Pscells in which RSRQ is greater than a preset RSRQ threshold, the method includes selecting, as the serving Pscell of the UE, the Pscell with the largest RSRQ among them. The method described in 1. The first received signal quality parameter of the UE includes reference signal received power (RSRP) of each Pscell received by the UE,
Selecting the serving Pscell of the UE
After the UE receives the RSRP of each Pscell around, it judges whether the RSRP of each Pscell around received is greater than a preset RSRP threshold,
When there is only one Pscell in which RSRP is larger than a preset RSRP threshold, the Pscell is selected as a serving Pscell of the UE,
In the case where there are a plurality of Pscells in which RSRP is larger than a preset RSRP threshold value, among them, selecting Pscell with the largest RSRP as the serving Pscell of the UE is included. The method described in 1. The first received signal quality parameter of the UE includes reference signal received power (RSRP) of each Pscell received by the UE,
Selecting the serving Pscell of the UE
After the UE receives the RSRP of each Pscell and the RSRP of Pcell, calculate the difference between the RSRP of the received Pcell and the RSRP of each Pscell,
Each determines whether the difference is smaller than a preset offset,
If there is only one difference smaller than the preset offset, select Pscell corresponding to this difference as the serving Pscell of the UE,
In the case where there are a plurality of differences smaller than the preset offset, the method includes selecting Pscell with the largest RSRP as the serving Pscell of the UE from among Pscells corresponding to these differences. The method according to claim 1 wherein The second received signal quality parameter of the UE includes reference signal received quality (RSRQ) of each Sscell received by the UE,
It may be determined whether it is necessary to add a serving Sscell to the UE,
After the UE receives the RSRQ of each Sscell, it determines whether the RSRQ of each received Sscell is greater than a preset second RSRQ threshold, respectively;
If the RSRQ of the received Sscell is greater than a preset second RSRQ threshold, the Sscell is added as a serving Sscell,
The method according to claim 1, comprising determining that it is not necessary to add a serving Sscell if there is no Sscell whose RSRQ is greater than a preset second RSRQ threshold.   The small cell base station determines whether to activate Sscell based on whether there is a UE accessing Sscell, and if there is a UE accessing Sscell, activates the Sscell and there is no UE accessing Sscell The method according to claim 1, further comprising not activating Sscell. A macrocell base station,
Based on the arrangement information of the secondary component cell (Scell) within the coverage of the own station, a plurality of primary secondary component cells (Pscell) are selected from the Scell, and the other Scell is set as the secondary secondary component cell (Sscell) Pscell determination means for determining and notifying the Scell of the selection result,
Pscell setting means for selecting the serving Pscell of the UE from each Pscell based on the first received signal quality parameter of the UE when the user terminal (UE) accesses, and notifying the UE of the serving Pscell;
Sscell which determines whether it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE when a user terminal (UE) accesses, and notifies the UE And a setting unit. A macrocell base station,
Receive setting information of primary secondary component cell (Pscell) reported from each small cell base station within the coverage of the own station, and determine multiple Pscell and secondary secondary component cells (Sscell) within the coverage of the own station Means for receiving setting information;
Pscell setting means for selecting the serving Pscell of the UE from each Pscell based on the first received signal quality parameter of the UE when the user terminal (UE) accesses, and notifying the UE of the serving Pscell;
Sscell which determines whether it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE when a user terminal (UE) accesses, and notifies the UE And a setting unit. A small cell base station,
The second Pscell is selected to select the primary secondary component cell (Pscell) from among the corresponding secondary component cells (Scell) of the own station, and to determine the other corresponding Scell of the own station as the secondary secondary component cell (Sscell) Means,
Pscell setting means for selecting the serving Pscell of the UE from each Pscell based on the first received signal quality parameter of the UE when the user terminal (UE) accesses, and notifying the UE of the serving Pscell;
Sscell which determines whether it is necessary to add a serving Sscell to the UE based on a second received signal quality parameter of the UE when a user terminal (UE) accesses, and notifies the UE And a setting unit. The second Pscell determination means
A downstream receiver that monitors the signal strength from the adjacent Scell in real time and determines the interference status from the adjacent Scell,
And a Pscell selection module for selecting, as a Pscell, a Scell that minimizes interference received from the adjacent Scell among the corresponding Scells of the own station based on the interference situation from the adjacent Scell determined by the own station. The small cell base station according to claim 12, characterized in that. The second Pscell determination means
An information exchange module for acquiring setting information of the Scell corresponding to the adjacent base station and information of Pscell selected by the adjacent base station through information exchange between the adjacent base stations;
Based on the configuration information of the Scell corresponding to the adjacent base station and the information of Pscell selected by the adjacent base station, select the Scell with the smallest interference received from the adjacent Scell as the Pscell from among the corresponding Scell of the own station The small cell base station according to claim 12, further comprising: a Pscell selection module.   Based on whether there is a UE accessing Sscell, decide whether to start Sscell, and if there is a UE accessing Sscell, start Sscell and if there is no UE accessing Sscell, do not start Sscell The small cell base station according to claim 12, further comprising an Sscell activation module.

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