WO2013170786A1 - Inter-cell interference coordination method, base station, and communication system - Google Patents

Abstract

Disclosed is an inter-cell interference coordination method, which comprises: a control base station of a first cell acquiring a resource occupancy rate of border users of the first cell, and sending the resource occupancy rate to a control base station of a second cell, the second cell being a neighboring cell of the first cell, and the resource occupancy rate of the border users of the first cell being used by the control base station of the second cell to configure an almost blank sub-frame that is sent through downlink transmission; and the control base station of the first cell receiving information about the almost blank sub-frame configured by the control base station of the second cell, and scheduling the border users of the first cell on a sub-frame, sent through downlink transmission, of the first cell, a time-domain location of the sub-frame being the same as a time-domain location of the almost blank sub-frame, sent through downlink transmission, of the second cell. Also disclosed are a base station and a communication system. The embodiments of the present invention can reasonably configure an almost blank sub-frame, sent through downlink transmission, of an interference cell, and improve the inter-cell interference coordination capability.

Description

 Method, base station and communication system for inter-cell interference coordination This application claims Chinese patent application filed on May 17, 2012, the Chinese Patent Office, Application No. 201210153836.6, entitled "Method, Base Station and Communication System for Inter-cell Interference Coordination" Priority is hereby incorporated by reference in its entirety. TECHNICAL FIELD The present invention relates to the field of communications technologies, and in particular, to a method, a base station, and a communication system for inter-cell interference coordination.

BACKGROUND OF THE INVENTION In a wireless communication system, a base station gives a user equipment on the downlink (User

Equipment, UE) transmits data and/or control information and receives data and/or control information of the user equipment on the uplink.

The Long Term Evolution (LTE) system is used as an example. The base station sends control information to the UE on the Physical Downlink Control Channel (PDCCH). The UE reads the control information carried on the PDCCH to learn the paging and system. Messages and information such as where to locate frequency domain resources. The UE then reads data according to the above information to its scheduled Physical Downlink Share Channel (PDSCH). In particular, the eNB indicates that the PDCCH actually occupies several Orthogonal Frequency Division Multiplexing (OFDM) symbols on the Physical Control Format Indictor Channel (PCnCH), which is generally 1~3; When the number of the downlink physical resource block (PRB, Physical Resource Block) is less than 10, the value is 2-4. In general, the UE learns the time domain start position of the PDSCH time-frequency resource according to the PCFICH; The information is obtained, and the location of the frequency domain of the PDSCH time-frequency resource to which the UE is allocated is obtained. If the UE fails to read the PDCCH, the data carried on the subsequent PDSCH cannot be obtained, so The performance of the PDCCH is critical to the cell.

 In a Heterogeneous Network (HetNet) scenario, a scenario in which a macro cell and a pico cell share a spectrum is taken as an example, because of the difference in transmit power between the Pico cell and the Macro cell. Larger, generally 30dBm and 46dBm respectively, the UE of the Pico cell receives severe interference from the Macro cell when receiving the PDCCH, resulting in poor PDCCH performance. If the Pico cell introduces a Cell Range Extension (CRE) technology, the performance of the PDCCH is further deteriorated. Therefore, the third generation partner, the Third Generation Partnership Project (3GPP), introduces the time domain enhanced inter-Cell Interference Coordination (elCIC) mechanism. The downlink inter-cell interference problem in hybrid deployment of different types of cells in a HetNet network is solved by an Almost Blank Subframe (ABS). The ABS subframe refers to a transmission with only common pilots in the subframe, or only a common pilot transmission and a control channel transmitted in a low power (or low activity mode). The above two schemes are respectively called ABS. Zero power scheme and ABS low power scheme. Among them, zero power and low power are for PDCCH. The aggregating cell configures its own individual downlink subframes as ABS subframes to reduce the downlink transmission to the victim cell, especially to the downlink control channel. Referring to FIG. 1 , it is a schematic structural diagram of a wireless heterogeneous network system in the prior art. Taking the scene of the shared spectrum of the macro cell Macro, the pico cell Pico 1 and the pico cell Pico 2 as an example, as shown in FIG. 2, the Macro configures the downlink subframes 1, 2 as "zero power" ABS, and protects the Pico 1 and Pico 2 service transmission; Macro configures downlink subframes 6, 7 as "low power" ABS to protect Pico2 service transmission; thereby solving downlink inter-cell interference problem.

However, the ABS mechanism still has the following problems: It is necessary to determine how many ABS subframes the Pico cell needs to protect its services from macro base station interference. For a Macro cell, multiple configuration of ABS subframes wastes resources. In addition, for the application scenario using the CRE technology, there is currently no mechanism for dynamically coordinating ABS after the CRE region changes. SUMMARY OF THE INVENTION Aspects of the present invention provide a method, a base station, and a communication system for inter-cell interference coordination, which are mechanisms for dynamically coordinating ABS after a CRE region change.

 An aspect of the present invention provides a method for inter-cell interference coordination, including: a control base station of a first cell acquires a resource occupancy rate of a boundary user of the first cell; and a control base station of the first cell The resource occupancy rate of the border user of a cell is sent to the control base station of the second cell; the second cell is the neighboring cell of the first cell, and the resource occupancy rate of the boundary user of the first cell is The control base station of the second cell is configured to configure an almost null subframe for downlink transmission; the control base station of the first cell receives almost blank subframe information configured by the control base station of the second cell, and the almost empty subframe information is used to indicate the The time domain location of the almost empty subframe transmitted by the downlink of the second cell; the control base station of the first cell schedules the border user of the first cell to be sent in the downlink of the first cell according to the almost empty subframe information The time domain position of the subframe is the same as the time domain location of the almost empty subframe transmitted by the downlink of the second cell.

 Another aspect of the present invention provides a base station, including: an obtaining unit, a sending unit, a receiving unit, and a scheduling unit. The acquiring unit is configured to acquire a resource occupancy rate of a boundary user of the first cell. The sending unit is configured to send a resource occupancy rate of a border user of the first cell to a control base station of the second cell; the second cell is a neighboring cell of the first cell, and a boundary of the first cell The resource occupancy rate of the user is used by the control base station of the second cell to configure an almost null subframe for downlink transmission. The receiving unit is configured to receive almost blank subframe information configured by the control base station of the second cell, where the almost blank subframe information is used to indicate a time domain location of an almost null subframe of the downlink sending of the second cell. The scheduling unit is configured to schedule, according to the almost empty subframe information, a boundary user of the first cell, in a downlink transmission subframe of the first cell, a time domain location of the subframe, and the second The time domain location of the almost empty subframe transmitted by the downlink of the cell is the same.

Another aspect of the present invention provides a method for inter-cell interference coordination, including: The control base station of the cell acquires the resource occupancy rate of the border user of the first cell; the control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell; The second cell is a neighboring cell of the first cell, where the control base station of the first cell and the control base station of the second cell are different base stations, and the first cell and the second cell have the same The carrier occupancy rate of the border user of the first cell is used by the control base station of the second cell to configure an almost null subframe for downlink transmission; the control base station of the first cell receives the control base station of the second cell The interference information includes: almost empty subframe information, where the almost empty subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell; The interference information is used to control a switch of the first cell.

 Another aspect of the present invention provides a base station, including: an obtaining unit, a transmitting unit, a receiving unit, and a control unit. The acquiring unit is configured to acquire a resource occupancy rate of a boundary user of the first cell. The sending unit is configured to send the resource occupancy rate of the border user of the first cell to the control base station of the second cell; the second cell is a neighboring cell of the first cell, and the first cell is Controlling the base station and the control base station of the second cell are different base stations, and the first cell and the second cell have the same carrier; the resource occupancy rate of the border user of the first cell is used by the second cell The control base station is configured to configure almost empty subframes for downlink transmission. The receiving unit is configured to receive interference information of a control base station of the second cell, where the interference information includes almost null subframe information, and the almost blank subframe information is used to indicate an almost null subframe of downlink transmission of the second cell. Time domain location. The control unit is configured to control a switch of the first cell according to the interference information.

Another aspect of the present invention provides a communication system, comprising: a control base station of a first cell and a control base station of a second cell; and the control base station of the first cell is any one of the base stations as described above; The control base station of the second cell is configured to configure an almost null subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell, and send almost null subframe information to the control base station of the first cell. Another aspect of the present invention provides a method for inter-cell interference coordination, including: a control base station of a third cell receives interference information sent by a control base station of a second cell; and the interference information includes control of the second cell The base station configures the number of almost empty subframes to be transmitted in the downlink according to the resource occupancy rate of the boundary user of the first cell; the control base station of the third cell controls the switch of the third cell according to the interference information; The first cell, the second cell, and the third cell are neighboring cells; the control base station of the first cell, the control base station of the second cell, and the control base station of the third cell are different. a base station, and the first cell, the second cell, and the third cell have the same carrier.

 Another aspect of the present invention provides a base station, including: a receiving unit, configured to receive interference information sent by a control base station of the second cell; the interference information includes a control base station of the second cell according to the first And a control unit, configured to control, according to the interference information, a switch of the third cell, where the first cell, the first cell The second cell and the third cell are neighboring cells; the control base station of the first cell, the control base station of the second cell, and the control base station of the third cell are different base stations, and the first cell The second cell and the third cell have the same carrier.

 The method for the inter-cell interference coordination provided by the embodiment of the present invention, the base station, and the communication system, configure the almost empty subframe of the second cell according to the resource occupancy rate of the boundary user of the first cell,

Dynamic coordination of the ABS when the CRE area changes, and the method can also reasonably configure the almost empty subframe of the downlink transmission of the adjacent second cell, and protect the first cell service from the interference of the second cell, and does not cause The resources of the second cell are wasted. Further, the present invention allocates resources according to the almost empty subframe information of the downlink transmission of the second cell, and when the boundary user of the first cell schedules the downlink transmission subframe of the first cell, the time domain location of the scheduled subframe is The time domain location of the almost empty subframe transmitted by the downlink of the second cell is the same, or the switch of the adjacent cell is controlled, and the capability of inter-cell interference coordination can be improved. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural diagram of a wireless heterogeneous network system in the prior art;

 2 is a schematic diagram of an almost empty subframe of inter-cell interference coordination in the prior art;

 FIG. 3 is a schematic flowchart of a method for inter-cell interference coordination by using an X2 interface or an S1 interface according to an embodiment of the present invention; FIG. Schematic diagram of the process;

 FIG. 5 is a schematic flowchart of a method for inter-cell interference coordination for transmitting resource occupancy rate by OAM according to an embodiment of the present invention; FIG.

 6 is a schematic flowchart of a method for inter-cell interference coordination for transmitting CRE configuration information through an X2 interface or an S1 interface according to an embodiment of the present invention;

 7 is a schematic flowchart of a method for inter-cell interference coordination for transmitting CRE configuration information through OAM according to an embodiment of the present invention;

 FIG. 8 is a schematic flowchart of another method for inter-cell interference coordination according to an embodiment of the present invention; FIG. 9 is a schematic flowchart of another method for inter-cell interference coordination according to an embodiment of the present invention; A schematic structural diagram of a base station;

 11 is a schematic structural diagram of a transmitting unit of the base station shown in FIG. 10;

 FIG. 12 is a schematic structural diagram of a communication system according to an embodiment of the present invention; FIG.

 FIG. 13 is a schematic flowchart of another method for inter-cell interference coordination according to an embodiment of the present invention; FIG. 14 is a schematic structural diagram of another base station according to an embodiment of the present invention;

 15 is a schematic structural diagram of a control unit of the base station shown in FIG. 14;

 16 is a schematic structural diagram of another communication system according to an embodiment of the present invention;

 FIG. 17 is a schematic flowchart of another method for inter-cell interference coordination according to an embodiment of the present invention; FIG. 18 is a schematic structural diagram of another base station according to an embodiment of the present invention;

 Figure 19 is a schematic diagram showing the structure of a control unit of the base station shown in Figure 18;

20 is a schematic structural diagram of another communication system in the embodiment of the present invention. The technical solutions in the embodiments of the present invention will be clearly described with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 In the existing ABS mechanism, it is determined how many ABS subframes a Pico cell needs to protect its service from macro base station interference. The current standard is to determine the number of ABS subframes according to the current Pico cell traffic volume, and Pico. The size of the traffic is described by the occupancy of Resource Blocks (RBs) on the ABS subframe. The RB occupancy rate on the ABS is exchanged between the Pico cell and the Macro cell. When the occupancy rate is high, the Macro cell allocates more ABS subframes to the Pico celL. However, for the Pico cell, the service is divided into the central service and the edge. business. The shaded area shown in Figure 1 is the CRE area of the Pico cell. The UE in the CRE area can only be scheduled on the ABS. In the Pico cell center, the signal to interference plus noise ratio (SINR) can meet the scheduling requirements, so the UE in the Pico cell center can be scheduled on the ABS subframe or the Non-ABS subframe. on. Therefore, the RB occupancy rate on the ABS in the standard is used to describe the current Pico cell traffic volume is not accurate enough, or even erroneous, because the more UEs in the Pico cell center, the higher the probability of scheduling on the ABS. The degree of deviation of the required amount of ABS is also higher. Especially in the Pico cell power-on process, the Macro cell does not have an ABS subframe, which makes the resources protected by ABS unmeasurable.

 Based on the foregoing analysis, the embodiment of the present invention provides a method, a base station, and a communication system for inter-cell interference coordination as follows, as a mechanism for dynamically coordinating ABS after a CRE region change.

 Referring to FIG. 3, a method for inter-cell interference coordination according to an embodiment of the present invention includes the following content.

 S30. The control base station of the first cell acquires a resource occupancy rate of a boundary user of the first cell.

S31. The control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell. The second cell is a neighboring cell of the first cell; the resource occupancy rate of the border user of the first cell is used by the control base station of the second cell for configuration Almost empty sub-frames sent downstream.

 532. Receive almost blank subframe information configured by the control base station of the second cell. The almost blank subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell. The above almost null subframe information can indicate which of the downlink transmission subframes of the second cell are almost empty subframes and which are non-almost null subframes.

 533. Schedule, according to the almost empty subframe information, a boundary user of the first cell, in a downlink transmission subframe of the first cell. The time domain location of the subframe is the same as the time domain location of the almost empty subframe transmitted by the downlink of the second cell.

 In S30, the control base station of the first cell acquires the resource occupancy rate of the boundary user of the first cell, and includes the following content.

S311: The control base station of the first cell receives the measurement report reported by the user equipment of the first cell, where the measurement report includes the reference signal received power RSRP ^{P of} the first cell and the reference signal received power of the second cell. RSRP ^M.

5312. If RSRP ^M -Bias RSRP ^P < RSRpM, the control base station of the first cell determines that the user equipment is a border user of the first cell; if RSRP ^P < RSRP ^M -Bias or RSRP ^P > RSRP ^M And the control base station of the first cell determines that the user equipment is not a boundary user of the first cell. Where Bias is a pre-configured reference signal received power difference.

 5313. The control base station of the first cell collects the resource occupation of the border user of the first cell, where the user equipment in the first cell can be divided into a border user and a central user, and the border user refers to a cell range extension located in the first cell. (CRE) User equipment in the area, and the central user refers to the user equipment located in the central area of the first cell. The boundary users of the first cell are scheduled in a low-power ABS subframe, and the central user is scheduled in a non-ABS subframe, which is advantageous for reducing interference, so that the UEs in the first cell are distinguished, and the radio resources can be allocated reasonably.

In S313, the method for the control base station of the first cell to collect the resource occupancy rate of the border user of the first cell includes: dividing the number of resource blocks of the boundary user of the first cell Obtaining a resource occupancy rate of the boundary user of the first cell by using the total number of resource blocks of the first cell; or dividing the number of resource blocks of the boundary user of the first cell by the first cell The number of resource blocks in the edge band obtains the resource occupancy rate of the boundary user of the first cell.

 The cell edge band refers to a resource block that is scheduled to be preferentially scheduled for use by the border user. When there is no border user, it is scheduled to the center user.

The resource occupancy rate of the border user of the first cell is used by the control base station of the second cell to configure an almost null subframe for downlink transmission, that is, the control base station of the second cell according to the boundary of the first cell The resource occupancy rate, the configuration of the almost empty subframe transmitted by the downlink, specifically includes: the control base station of the second cell performs the resource occupancy rate of the boundary user of the first cell with the first threshold value and the second threshold value respectively. Comparing; the first threshold is less than the second threshold. If the resource occupancy rate of the border user of the first cell is less than the first threshold, the nearly null subframe of the downlink transmission of the second cell is reduced by 1^>1; If the resource usage of the border user is greater than the second threshold, the almost empty subframe of the downlink transmission of the second cell is increased by N ₂ , N ₂ >1; if the resource of the border user of the first cell is occupied If the rate is greater than or equal to the first threshold, and the resource occupancy rate of the border user of the first cell is less than or equal to the second threshold, the downlink of the second cell is not changed. The number of frames.

In the specific implementation, the first threshold value, the second threshold value, and the value of N^N ₂ may be set according to actual conditions.

Optionally, the control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell, and the method includes: the control base station of the first cell is sent to the first The control base station of the second cell is transmitted to the control base station of the second cell through the S1 interface, or to the control base station of the second cell through the Operation Administration and Maintenance (OAM) center, or through the base station and the base station coordinator. The interface between (eCordinator) is transmitted to the control base station of the second cell. The base station coordinator can be connected to multiple base stations to implement joint scheduling, synchronization, and control signals between the base stations. Let forwarding and other functions.

 The method for coordinating inter-cell interference provided by this embodiment is configured to allocate resources according to the almost empty subframe information of the downlink of the second cell, and when the boundary user of the first cell schedules the downlink transmission subframe of the first cell, the scheduled The time domain position of the subframe is the same as the time domain location of the almost empty subframe transmitted by the downlink of the second cell, and the capability of inter-cell interference coordination can be improved. Based on the foregoing embodiment of FIG. 3, the following describes the transmission of resource occupancy rate and the configuration procedure of almost empty subframes in conjunction with FIG. 4 and FIG.

 Referring to Figure 4, the resource usage and ABS configuration flow are transmitted through the X2 interface or the S1 interface, including the following.

 5401. The user equipment and the control base station of the first cell perform service transmission.

 After the control base station of the first cell obtains the resource occupancy rate of the border user, the border user of the first cell is connected through the X2 interface between the control base station of the first cell and the control base station of the second cell or through the S1 interface. The resource occupancy rate is passed to the control base station of the second cell.

 S403. After receiving the resource occupancy rate of the boundary user of the first cell, the control base station of the second cell configures the almost empty subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell; and controls by the first cell. The X2 interface between the base station and the control base station of the second cell or through the S1 interface transmits almost blank subframe information to the control base station of the first cell. Referring to Figure 5, the resource usage and ABS configuration process through OAM includes the following.

S501. The user equipment and the control base station of the first cell perform service transmission.

 S502. After obtaining the resource occupation rate of the boundary user of the first cell, the control base station of the first cell transmits the resource occupancy rate of the boundary user of the first cell to the OAM.

 S503. The OAM transmits the resource occupancy rate of the border user of the first cell to the control base station of the second cell.

After the control base station of the second cell receives the resource occupancy rate of the boundary user of the first cell, Configuring a nearly null subframe that is sent in the downlink according to the resource occupancy rate of the boundary user of the first cell; and using an X2 interface between the control base station of the first cell and the control base station of the second cell or through the S1 interface, the almost empty subframe The information is passed to the control base station of the first cell.

 In addition, after obtaining the resource occupancy rate of the boundary user of the first cell, the control base station of the first cell may further connect the boundary of the first cell by using an interface between the control base station of the first cell and the base station coordinator. The resource occupancy rate of the user is transmitted to the base station coordinator, and the resource occupancy rate of the boundary user of the first cell is transmitted to the first by the base station coordinator through an interface between the base station coordinator and the control base station of the second cell. The control base station of the second cell. After receiving the resource occupancy rate of the border user of the first cell, the control base station of the second cell configures the almost empty subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell, and controls the second cell. An interface between the base station and the base station coordinator transmits the almost blank subframe information to the base station coordinator, and the base station coordinator passes the almost empty subframe through an interface between the base station coordinator and the control base station of the first cell The information is passed to the control base station of the first cell.

 The method for coordinating inter-cell interference provided in this embodiment, according to the resource occupancy rate of the boundary user of the first cell, reasonably configuring the downlink ABS subframe of the adjacent second cell; scheduling the first user of the boundary of the first cell When the downlink subframe of the cell is transmitted, the time domain location of the scheduled subframe is the same as the time domain location of the almost empty subframe transmitted by the downlink of the second cell, and the first cell service can be protected from the second cell interference. And for the second cell, it will not cause waste of resources.

In an embodiment, the method for coordinating inter-cell interference provided in this embodiment can configure the downlink transmission of the second cell according to the resource occupancy rate of the boundary user of the first cell when the control base station of the first cell is powered on. The null subframe is specifically as follows: When the control base station of the first cell is powered on, the second cell does not set any ABS. Therefore, according to the current protocol, the load (traffic) in the ABS cannot be measured. After the CRE is configured in the first cell, the CRE area starts to be interfered. In this scenario, the method for coordinating inter-cell interference provided by the foregoing embodiment is performed, and the boundary user in the first cell is determined, and the first cell is coordinated according to the resource occupancy rate of the boundary user in the first cell. The number of ABS subframes protects the first cell service from the second cell interference. Moreover, the control base station of the second cell appropriately configures the number of ABS subframes to be sent in the downlink according to the resource occupancy rate of the boundary user of the first cell, and does not cause waste of resources for the second cell.

 In another embodiment, the method for coordinating inter-cell interference provided by the embodiment of the present invention, by monitoring the CRE configuration, dynamically coordinating the almost empty subframe transmitted by the downlink of the second cell after the CRE region is changed.

 In addition, the method for inter-cell interference coordination provided in this embodiment, before the foregoing S30, further includes: when the first cell performs cell range extension, sending cell range extension configuration information to the control base station of the second cell. a cell range extension configuration value including a cell range extension offset value (CRE bias value), and a time when the cell range extension offset value is enabled; the cell range extension configuration information is used for Notifying the control base station of the second cell to change the cell range extension configuration; and receiving the cell range extension response information returned by the control base station of the second cell.

 The time to enable the CRE bias value can be absolute time, or relative time.

 The absolute time includes: clock time; when the first cell and the second cell agree to reach the clock time point, the CRE configuration after the cell range extension is enabled.

 The relative time includes: a certain subframe number; when the subframe transmitted by the downlink of the first cell and the second cell reaches the subframe number, the CRE bias value after the cell range extension is started to be used.

 The relative time also includes: the Nth subframe number after receiving the CRE configuration information and before returning the CRE configuration response information. That is, after the first cell agrees that the second cell receives the CRE configuration information, the two parties in the Nth subframe start to jointly enable the CRE bias value after the cell range extension. The relative time (such as the Nth subframe number) may be carried by the control base station of the first cell when transmitting the CRE configuration information, or may be carried by the control base station of the second cell when transmitting the CRE configuration response information.

It should be noted that, if the control base station of the first cell does not receive the CRE configuration response information returned by the control base station of the second cell, the control base station in the first area will repeatedly send the CRE configuration. Set the information.

 In an embodiment, the first cell change cell range extension configuration may be a stepped CRE extension when the control base station of the first cell is powered on, as follows:

 When the control base station of the first cell is powered on, the CRE extension is started in a stepwise manner. For example, CRE starts with OdB and uses 0.5dB as the expansion step, with an extended interval of 0.5 hours, trying to extend the CRE area. The CRE extension stops in the following situations:

 1) The entire cell traffic of the first cell reaches a certain threshold; for example, the RB occupancy rate reaches 85%, which indicates that the network rule design for absorbing enough UE services is achieved, and the purpose of placing the first small area by the operator is achieved;

 2) In the first '〗, CRE expansion process, PDCCH block error rate (Block Error Ratio,

BLER) is above a certain threshold, for example, higher than 0.1%, indicating that the CRE extended area is sufficiently disturbed and is no longer suitable for CRE expansion;

 3) The CRE extension reaches the upper limit of the CRE value that can be set by the first cell.

 In the process of expanding the CRE configuration of the first cell, each step of the CRE changes, and the control base station of the first cell passes the X2 interface, or through the S1 interface, or through the OAM, or through the interface between the base station and the base station coordinator. The CRE configuration information is transmitted to the control base station of the second cell.

 The transfer process of the CRE configuration will be described in detail below with reference to FIG. 6 and FIG. 7.

 As shown in FIG. 6, the user equipment and the control base station of the first cell perform service transmission. The method for transmitting the CRE configuration information by the control base station of the first cell and the control base station of the second cell through the X2 interface or the S1 interface includes the following contents.

 S601. When the first cell changes the cell range extension configuration, the control base station of the first cell transmits the CRE configuration information through the X2 interface between the control base station of the first cell and the control base station of the second cell or through the S1 interface. Go to the control base station of the second cell.

S602. After receiving the CRE configuration information, the control base station of the second cell changes the cell range extension configuration, and passes the X2 interface between the control base station of the first cell and the control base station of the second cell or The CRE configuration response information is returned to the control base station of the first cell through the SI interface.

 As shown in FIG. 7, the user equipment and the control base station of the first cell perform service transmission. The control base station of the first cell and the control base station of the second cell transmit CRE configuration information through OAM, including the following.

 5701. When the first cell changes the cell range extension configuration, the control base station of the first cell delivers the CRE configuration information to the OAM.

 S702: The OAM delivers the CRE configuration information to the control base station of the second cell.

 After receiving the CRE configuration information, the control base station of the second cell changes the cell range extension configuration, and returns the CRE configuration response information to the OAM.

 5704. The OAM returns CRE configuration response information to the control base station in the first area.

 In addition, in this embodiment, the CRE configuration information may be transmitted through the interface between the base station coordinator and the base station, and the delivery procedure is used to transmit the resource occupancy rate of the boundary user of the first cell to the foregoing interface between the base station coordinator and the base station. The process is the same and will not be described in detail here.

 In another embodiment, the first cell change cell range extension configuration may be to reconfigure the CRE, for example: the operator needs to reconfigure the CRE of the first 'zone, including the CRE bias value increment due to network optimization or troubleshooting. Or decrement, or configure a new CRE bias value via OAM. In the specific implementation process, for example, when the first area service is too large (such as the RB occupancy rate exceeds 95% for a long time or the interference is obvious, or the PDCCH BLER is higher than the threshold value of 0.2%, etc.), the first cell needs to be reduced. CRE bias value. The process of configuring the CRE is the same as the step of performing the stepped CRE expansion when the control base station of the first cell is powered on, and will not be described in detail herein.

In the above embodiment, performing step-based CRE expansion or reconfiguring the CRE when the control base station of the first cell is powered on may cause a change in the CRE area. If the CRE area becomes larger or smaller, the range of cell coverage changes, which will result in a change in the number of UEs actually accessing the cell, thereby causing a change in the edge traffic of the first cell. After the edge traffic changes, the edge service of the first cell can only be performed on the ABS. In this scenario, the inter-cell provided by the foregoing embodiment is implemented. The interference coordination method can coordinate the number of ABS subframes required by the first cell according to the resource occupancy rate of the boundary user in the first cell, and can meet the data transmission requirement of the boundary user of the first cell.

 In the embodiment of the present invention, when the CRE size changes, the ABS can be dynamically coordinated through the X2 interface, the S1 interface, or the OAM. A detailed description will be given below with reference to Figs. 8 and 9.

 Referring to FIG. 8, this embodiment provides another method for inter-cell interference coordination. The user equipment and the control base station of the first cell perform service transmission. When the CRE size changes, this embodiment passes

Dynamically coordinate ABS through the X2 interface or through the S1 interface, including the following.

 When the first cell changes the cell range extension configuration, the control base station of the first cell transmits the CRE configuration information through the X2 interface between the control base station of the first cell and the control base station of the second cell or through the S1 interface. Go to the control base station of the second cell. The first cell and the second cell are neighboring cells.

 After receiving the CRE configuration information, the control base station of the second cell changes the cell range extension configuration, and uses the X2 interface between the control base station of the first cell and the control base station of the second cell or through the S1 interface to the first cell. The controlling base station returns CRE configuration response information.

 The control base station of the first cell re-determines the boundary user of the first cell, and calculates the resource occupancy rate of the boundary user of the first cell, and passes the X2 interface between the control base station of the first cell and the control base station of the second cell or The S1 interface transmits the resource occupancy rate of the border user of the first cell to the control base station of the second cell.

 After receiving the resource occupancy rate of the border user of the first cell, the control base station of the second cell configures the almost empty subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell; and controls the first cell. The X2 interface between the base station and the control base station of the second cell or through the S1 interface transmits almost blank subframe information to the control base station of the first cell.

 The almost empty subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell. The above almost null subframe information can indicate which of the downlink transmission subframes of the second cell are almost empty subframes and which are non-almost null subframes.

5805. After the control base station of the first cell receives the almost null subframe information, according to the foregoing The null subframe information is used to schedule the boundary user of the first cell in the downlink subframe of the first cell, and the time domain location of the subframe and the time domain location of the almost empty subframe transmitted by the downlink of the second cell the same.

 Referring to FIG. 9, this embodiment provides another method for inter-cell interference coordination. The user equipment and the control base station of the first cell perform the service transmission. When the CRE size changes, the embodiment dynamically coordinates the ABS by using the OAM, and specifically includes the following content.

 S901: When the first cell changes the cell range extension configuration, the control base station of the first cell transmits the CRE configuration information to the OAM.

 5902. The OAM delivers the CRE configuration information to the control base station of the second cell. The first cell and the second cell are neighboring cells.

 After receiving the CRE configuration information, the control base station of the second cell changes the cell range extension configuration, and returns the CRE configuration response information to the OAM.

 5904. The OAM returns a CRE configuration response message to the control base station in the first area.

 5905. The control base station of the first cell re-determines the boundary user of the first cell, and collects the resource occupancy rate of the boundary user of the first cell, and transmits the resource occupancy rate of the boundary user of the first cell to the OAM.

 S906: The OAM transmits the resource occupancy rate of the border user of the first cell to the control base station of the second cell.

 After receiving the resource occupancy rate of the border user of the first cell, the control base station of the second cell configures the almost empty subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell; and controls the first cell. The X2 interface between the base station and the control base station of the second cell or through the S1 interface transmits almost blank subframe information to the control base station of the first cell.

 The almost empty subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell. The above almost null subframe information can indicate which of the downlink transmission subframes of the second cell are almost empty subframes and which are non-almost null subframes.

5908. After the control base station of the first cell receives almost blank subframe information, according to the foregoing The null subframe information is used to schedule the boundary user of the first cell in the downlink subframe of the first cell, and the time domain location of the subframe and the time domain location of the almost empty subframe transmitted by the downlink of the second cell the same.

 In addition, in this embodiment, the resource occupancy rate, the almost empty subframe information, and the CRE configuration information of the border user of the first cell may be transmitted through an interface between the base station coordinator and the base station.

 The embodiment of the present invention further provides a base station according to FIG. 10 and a communication system as shown in FIG. 12, which can implement the foregoing method for coordinating inter-cell interference.

 Referring to FIG. 10, this embodiment provides a base station, including: an acquiring unit 100, a sending unit

101. The receiving unit 102 and the scheduling unit 103.

 The acquiring unit 100 is configured to acquire a resource occupancy rate of a boundary user of the first cell.

 The sending unit 101 is configured to send the resource occupancy rate of the border user of the first cell to the control base station of the second cell. The second cell is a neighboring cell of the first cell; the resource occupancy rate of the border user of the first cell is used by the control base station of the second cell to configure an almost empty subframe transmitted by the downlink.

 The receiving unit 102 is configured to receive almost blank subframe information configured by the control base station of the second cell, where the almost blank subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell.

 The scheduling unit 103 is configured to schedule, according to the almost empty subframe information, a boundary user of the first cell, in a downlink transmission subframe of the first cell, a time domain location of the subframe, and the foregoing The time domain location of the almost empty subframe transmitted by the downlink of the two cells is the same.

 As shown in FIG. 11, the obtaining unit 100 specifically includes: a receiving subunit 1011, a determining subunit 1012, and a processing subunit 1013.

The receiving subunit 1011 is configured to receive a measurement report reported by the user equipment of the first cell, where the measurement report includes a reference signal received power RSRP ^{P of} the first cell and a reference signal received power RSRP of the second cell. ^M.

The determining subunit 1012 is configured to: if RSRP ^M -Bias RSRP ^P < RSRP ^M Determining that the user equipment is a border user of the first cell; if RSRP ^P < RSRP ^M -Bias or RSRP ^P > RSRP ^M , determining that the user equipment is not a boundary user of the first cell; wherein, Bias is The pre-configured reference signal receives the power difference.

 The processing sub-unit 1013 is configured to collect the resource usage of the border user of the first cell. The processing sub-unit 1013 may be further configured to: divide the number of resource blocks of the boundary user of the first cell by The number of all resource blocks of the first cell is obtained, and the resource occupancy rate of the boundary user of the first cell is obtained; or the number of resource blocks of the boundary user of the first cell is divided by the edge band of the first cell. The number of resource blocks is obtained, and the resource occupancy rate of the boundary user of the first cell is obtained.

 The sending unit 101 is further configured to: when the first cell performs cell range extension, send cell range extension configuration information to a control base station of the second cell; the cell range extension configuration information includes a cell range extension offset a value, and a time when the cell range extension offset value is enabled; the cell range extension configuration information is used to notify the control base station of the second cell to change the cell range extension configuration;

 The receiving subunit 1011 is further configured to: receive the cell range extension response information returned by the control base station of the second cell.

 The base station provided in this embodiment allocates resources according to the almost empty subframe information of the downlink of the second cell, and when the boundary user of the first cell schedules the downlink transmission subframe of the first cell, the time domain of the scheduled subframe The location is the same as the time domain location of the almost empty subframe transmitted by the downlink of the second cell, and the capability of inter-cell interference coordination can be improved. Referring to FIG. 12, this embodiment provides a communication system including a control base station 121 of a first cell and a control base station 122 of a second cell.

The control base station 121 of the first cell is the base station described above in FIG. 10 and FIG. 11; the control base station 122 of the second cell is configured to use the resource occupancy rate of the boundary user of the first cell, The almost empty subframe transmitted in the downlink is configured, and the almost blank subframe information is sent to the control base station of the first cell.

The control base station 122 of the second cell specifically includes: a comparing unit 1221 and a configuration unit 1222. The comparing unit 1221 is configured to compare the resource occupancy rate of the boundary user of the first cell with a first threshold value and a second threshold value, where the first threshold value is smaller than the second threshold. Limit. The configuration unit 1222 is configured to: if the resource occupancy rate of the border user of the first cell is less than the first threshold, the nearly empty subframe of the downlink transmission of the second cell is reduced by >1; If the resource occupancy rate of the border user of the first cell is greater than the second threshold, the nearly null subframe of the downlink transmission of the second cell is increased by N ₂ , N ₂ >1; If the resource occupancy rate of the border user is greater than or equal to the first threshold, and the resource occupancy rate of the border user of the first cell is less than or equal to the second threshold, the second cell is not changed. The number of almost empty subframes sent downstream.

 Optionally, the control base station of the first cell is further configured to use the X2 interface, or through an S1 interface, or through an operation management and maintenance center OAM, or through an interface between a base station and a base station coordinator. The resource occupancy rate of the border user of the cell is transmitted to the control base station of the second cell. The control base station of the second cell is further configured to transmit the almost blank subframe information to the first cell through an X2 interface, or through an S1 interface, or through OAM, or through an interface between a base station and a base station coordinator. Control base station.

The communication system provided in this embodiment can reasonably configure the almost empty subframe for downlink transmission of the neighboring second cell according to the resource occupancy rate of the boundary user of the first cell, and can not only protect the first cell service from the second cell interference. And for the second cell, it will not cause waste of resources. At the same time, when the boundary user of the first cell schedules the downlink transmission subframe of the first cell according to the almost empty subframe information of the downlink transmission of the second cell, the time domain location of the scheduled subframe and the second cell are The time-domain locations of almost empty subframes transmitted by the downlink are the same, which can improve the ability of inter-cell interference coordination. Referring to FIG. 13, this embodiment provides another method for inter-cell interference coordination, including the following inner valley.

 S130. The control base station of the first cell acquires the resource occupation S131 of the border user of the first cell, and the control base station of the first cell sends the resource occupancy rate of the boundary user of the first cell to the second cell. Control the base station. The second cell is a neighboring cell of the first cell, where the control base station of the first cell and the control base station of the second cell are different base stations, and the first cell and the second cell have the same The carrier occupancy rate of the border user of the first cell is used by the control base station of the second cell to configure an almost null subframe for downlink transmission.

 S132. The control base station of the first cell receives interference information of a control base station of the second cell. The interference information includes almost null subframe information; the almost blank subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell.

 S133. The control base station of the first cell controls the switch of the first cell according to the interference information.

 In S130 and S131, a method for determining a boundary user of a first 'zone, a method for counting resource occupancy of a boundary user of a first cell, a method for transmitting a resource occupancy rate, and a control base station for a second cell configuring an almost empty space for downlink transmission The method of the frame and the method of dynamically coordinating the ABS when the cell range is extended are the same as those of the embodiment described above with reference to FIG. 3 to FIG. 9, and are not described herein.

 In S132, the control base station of the first cell controls the switch of the first cell according to the interference information, and includes: the control base station of the first cell performs the interference information with a preset threshold value. And comparing, according to the comparison result, determining whether the first cell needs to be closed; if the first cell needs to be shut down, switching the user equipment in the first cell to the third cell, and shutting down the first cell; If the first cell does not need to be shut down, the border user of the first cell is handed over to the third cell, and the first cell is not closed.

The control base station of the first cell and the control base station of the third cell are the same base station, and the first cell and the third cell have different carriers. The first cell and the third cell are cells of two different carriers in the same control base station, that is, the base station uses a carrier aggregation (CA) cell of multiple carriers, and the base station can selectively turn on or off a certain cell. The cell, or handover, tunes the UE from the cell of one carrier to the cell of another carrier, in order to coordinate interference between cells.

 The first cell and the second cell are the cells with the same carrier in the two different base stations. The more the number of ABSs transmitted by the control base station of the second cell, the higher the resource occupancy rate of the first cell scheduled on the CRE. That is, the greater the amount of traffic on the CRE, or the more UEs in the CRE area, the first, the more severe the interference experienced by the zone. In this embodiment, the base station may select a carrier according to the number of ABSs in the ABS information. For example, when the number of ABSs is 1, it indicates that the interference exists but is not serious, and the first cell may be used. When the number of ABSs exceeds a certain threshold (for example, the threshold is 2), the interference is severe, and the first cell needs to be shut down, other cells are used, or the UE of the first cell is switched to another cell.

 In an optional implementation manner, the control base station of the second cell transmits the interference information to the first cell through an X2 interface, or through an S1 interface, or through OAM, or through an interface between the base station and the base station coordinator. Control base station. The interference information may further include a High Interference Indicator (ΗΠ), an Overload Indicator (01), a Relative Narrowband TX Power Indicator (RNTP), and a Block Error Rate (BLER). At least one of a Channel Quality Indicator (CQI). The method for determining whether the cell needs to be shut down is: comparing each item of the interference information with a corresponding threshold; if each item is greater than the corresponding threshold, it indicates that the first cell has serious interference and needs to be closed. First cell; otherwise there is no need to shut down the cell.

The method for co-inter-cell interference coordination provided in this embodiment allocates resources according to the almost empty subframe information of the downlink transmission of the second cell, and controls the switches of the neighboring cells, thereby improving the capability of inter-cell interference coordination. The embodiment of the present invention further provides a base station as shown in FIG. 14 and a communication system as shown in FIG. A flow of a method capable of implementing the inter-cell interference coordination described in FIG. 13 above.

 Referring to FIG. 14, the base station provided in this embodiment includes: an obtaining unit 140, a sending unit 141, a receiving unit 142, and a control unit 143.

 The acquiring unit 140 is configured to acquire a resource occupancy rate of a boundary user of the first cell.

 The sending unit 141 is configured to send the resource occupancy rate of the border user of the first cell to the control base station of the second cell. The second cell is a neighboring cell of the first cell, where the control base station of the first cell and the control base station of the second cell are different base stations, and the first cell and the second cell have the same The carrier occupancy rate of the border user of the first cell is used by the control base station of the second cell to configure an almost null subframe for downlink transmission.

 The receiving unit 142 is configured to receive interference information of a control base station of the second cell, where the interference information includes almost blank subframe information. The almost blank subframe information is used to indicate a time domain location of an almost null subframe of the downlink transmission of the second cell.

 The control unit 143 is configured to control the switch of the first cell according to the interference information. The obtaining unit 140 and the transmitting unit 141 are the same as the structures and functions of the obtaining unit 100 and the transmitting unit 101 of FIG. 10 and FIG. 11 described above, and are not described herein.

 As shown in FIG. 15, the control unit 143 specifically includes: a determining subunit 1431 and a coordinating subunit 1432.

 The determining subunit 1431 is configured to compare the interference information with a preset threshold, and determine, according to the comparison result, whether the first cell needs to be closed. The coordination subunit 1432 is configured to: if the first cell needs to be shut down, switch the user equipment in the first cell to the third cell, and close the first cell; if the first cell does not need to be closed The cell, the border user of the first cell is handed over to the third cell, and the first cell is not closed.

 The control base station of the first cell and the control base station of the third cell are the same base station, and the first cell and the third cell have different carriers. The interference information further includes at least one of ΗΠ, 01, RNTP, BLER, and CQI.

Optionally, the resource occupancy rate of the border user of the first cell is transmitted through the X2 interface. The control base station of the second cell, or the control base station transmitted to the second cell through the S1 interface, or the control base station transmitted to the second cell by using the OAM, or the interface between the base station and the base station coordinator Transmitted to the control base station of the second cell.

 The base station for inter-cell interference coordination provided in this embodiment allocates resources according to the almost empty subframe information of the downlink of the second cell, controls the switches of the neighboring cells, and can improve the capability of inter-cell interference coordination. Referring to FIG. 16, a communication system provided by this embodiment includes a control base station 161 of a first cell and a control base station 162 of a second cell.

 The control base station 161 of the first cell is the base station described above with reference to Figs. 14 and 15 . The control base station 162 of the second cell is configured to configure an almost null subframe transmitted by the downlink according to the resource occupancy rate of the boundary user of the first cell, and send almost blank subframe information to the control base station of the first cell.

The control base station 162 of the second cell specifically includes: a comparison unit 1621 and a configuration unit 1622. The comparing unit 1621 is configured to: compare a resource occupancy rate of the boundary user of the first cell with a first threshold value and a second threshold value, where the first threshold value is smaller than the second threshold value; Threshold. The configuration unit 1622 is configured to: if the resource occupancy rate of the border user of the first cell is less than the first threshold, the number of almost empty subframes sent by the second cell is reduced by >1; If the resource occupancy rate of the border user of the first cell is greater than the second threshold, the almost empty subframe of the downlink transmission of the second cell is increased by N ₂ , N ₂ >1; If the resource occupancy rate of the border user is greater than or equal to the first threshold, and the resource occupancy rate of the border user of the first cell is less than or equal to the second threshold, the second cell is not changed. The number of almost empty subframes sent downstream.

Optionally, the control base station of the first cell may use the X2 interface, or the S1 interface, or the OAM, or the interface between the base station and the base station coordinator to occupy the resource of the border user of the first cell. Rate transmitted to the control base station of the second cell; the second The control base station of the cell may transmit the interference information to the control base station of the first cell through an X2 interface, or through an S1 interface, or through OAM, or through an interface between the base station and the base station coordinator.

 The communication system provided in this embodiment can reasonably configure the almost empty subframe for downlink transmission of the neighboring second cell according to the resource occupancy rate of the boundary user of the first cell, and can not only protect the first cell service from the second cell interference. And for the second cell, it will not cause waste of resources. At the same time, the resources are allocated according to the almost empty subframe information of the downlink transmission of the second cell, and the switch of the adjacent cell is controlled, thereby improving the capability of inter-cell interference coordination. Referring to FIG. 17, this embodiment provides another method for inter-cell interference coordination, including the following intra-valley.

 The control base station of the third cell receives the interference information sent by the control base station of the second cell, where the interference information includes the downlink transmission of the control base station of the second cell according to the resource occupancy rate of the boundary user of the first cell. The number of almost empty sub-frames.

 5172. The control base station of the third cell controls, according to the interference information, a switch of the third cell.

 The first cell, the second cell, and the third cell are neighboring cells; the control base station of the first cell, the control base station of the second cell, and the control base station of the third cell It is a different base station, and the first cell, the second cell, and the third cell have the same carrier.

 It should be noted that, in this implementation, how to determine a boundary user of a first cell, a method for collecting a resource occupancy rate of a boundary user of a first cell, a method for transmitting a resource occupancy rate, and a control base station of a second cell are configured to perform downlink transmission. The method of the almost empty subframe and the method of dynamically coordinating the ABS when the cell range is extended are the same as those of the embodiment described above with reference to FIG. 3 to FIG. 9, and are not described herein.

In S172, the control base station of the third cell controls the switch of the third cell according to the interference information, and includes: the control base station of the third cell sets the interference information with a preset The threshold values are compared, and it is determined according to the comparison result whether the third cell needs to be closed. If the third cell needs to be closed, the third cell is closed, and the fourth cell is turned on; if the third cell does not need to be shut down, the third cell is not closed, and the fourth cell is not enabled. . The control base station of the third cell and the control base station of the fourth cell are the same base station, and the third cell and the fourth cell have different carriers. The control base stations of the third cell and the fourth cell are used.

In the CA cell, the base station may selectively turn on or off a certain cell, or switch the cell from one carrier to another in the cell to facilitate coordination of inter-cell interference.

 The first cell, the second cell, and the third cell are cells having the same carrier among the three different base stations, and the more the number of ABSs transmitted by the control base station of the second cell is, the resource occupied by the first cell is scheduled to be scheduled on the CRE. The higher the rate, that is, the greater the amount of traffic on the CRE, or the more UEs in the CRE area, indicating that the interference experienced by the first cell is more serious. For example, when the number of ABSs is more than 2, indicating that the interference is severe, the neighboring base station turns off the third cell having the same carrier frequency as the first cell, and turns on the fourth cell of the other carrier.

 In an optional implementation manner, the control base station of the second cell transmits the interference information to the third cell through an X2 interface, or through an S1 interface, or through OAM, or through an interface between the base station and the base station coordinator. Control base station. The interference information may further include at least one of ΗΠ, 01, RNTP, BLER, CQI. The method for determining whether to close the third cell is: comparing each item of the interference information with a corresponding threshold; if each item is greater than the corresponding threshold, it indicates that the first cell has serious interference. The third cell needs to be closed; otherwise the third cell does not need to be closed.

 Further, when the interference is severe, and it is determined that the third cell needs to be closed, if there is a UE in the third cell, the fourth cell is first turned on, and the UE in the third cell is switched to the fourth cell, and then the third cell is closed. If there is no UE in the third cell (for example, when the control base station of the third cell is powered on, there is no UE in the third cell), then the third cell is directly turned off, and the fourth cell is turned on.

The method for coordinating the inter-cell interference provided by the embodiment, by receiving the interference information sent by the control base station of the neighboring cell, and controlling the switch of the neighboring cell according to the interference information, can High inter-cell interference coordination capability. The embodiment of the present invention further provides a flow of a method for implementing inter-cell interference coordination according to the base station shown in FIG. 18 and the communication system shown in FIG.

 Referring to FIG. 18, the base station provided in this embodiment includes: a receiving unit 181 and a control unit 182. The receiving unit 181 is configured to receive the interference information that is sent by the control base station of the second cell, where the interference information includes the downlink transmission of the control base station of the second cell according to the resource occupancy rate of the boundary user of the first cell. The number of almost empty sub-frames. The control unit 182 is configured to control a switch of the third cell according to the interference information.

 The first cell, the second cell, and the third cell are neighboring cells; the control base station of the first cell, the control base station of the second cell, and the control base station of the third cell It is a different base station, and the first cell, the second cell, and the third cell have the same carrier.

 As shown in FIG. 19, the control unit 182 specifically includes: a determining subunit 1821 and a coordinating subunit 1822.

 The determining subunit 1821 is configured to compare the interference information with a preset threshold, and determine, according to the comparison result, whether the third cell needs to be closed; the coordination subunit 1822 is configured to: if the third part needs to be closed And the third cell is closed, and the fourth cell is turned on; if the third cell is not required to be closed, the third cell is not closed, and the fourth cell is not enabled.

 The control base station of the third cell and the control base station of the fourth cell are the same base station, and the third cell and the fourth cell have different carriers. The interference information further includes at least one of ΗΠ, 01, RNTP, BLER, and CQI.

The base station provided in this embodiment can improve the capability of inter-cell interference coordination by receiving interference information sent by a control base station of a neighboring cell and controlling a switch of a neighboring cell according to the interference information. Referring to FIG. 20, a communication system according to an embodiment of the present invention includes a control base station 201 of a first cell, a control base station 202 of a second cell, and a control base station 203 of a third cell.

 The control base station 203 of the third cell is the base station described in FIG. 18 and FIG. 19; the control base station 202 of the second cell is configured to configure the downlink transmission according to the resource occupancy rate of the boundary user of the first cell. Empty sub-frame.

 Optionally, the control base station 201 of the first cell transmits the resource occupancy rate of the border user of the first cell to the control base station 202 of the second cell through the X2 interface, or through the S1 interface, or through the OAM; The base station 202 transmits the interference information or almost null subframe information to the control base station 203 of the third cell through the X2 interface, or through the S1 interface, or through the OAM.

 In the communication system provided by the embodiment, the base station receives the interference information sent by the control base station of the neighboring cell, and controls the switch of the neighboring cell according to the interference information, thereby improving the capability of inter-cell interference coordination.

 The method for the inter-cell interference coordination provided by the embodiment of the present invention, the base station, and the communication system, according to the resource occupancy rate of the boundary user of the first cell, can reasonably configure the almost empty subframe of the downlink transmission of the adjacent second cell, which can not only protect the first A cell service is not interfered by the second cell, and for the second cell, no waste of resources is caused. The present invention allocates resources according to the almost empty subframe information of the downlink transmission of the second cell, and when the boundary user of the first cell schedules the downlink transmission subframe of the first cell, the time domain location of the scheduled subframe and the second cell The time domain location of the almost empty subframe transmitted by the downlink is the same, or the switch of the adjacent cell is controlled, and the capability of inter-cell interference coordination can be improved.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, or a read-only storage memory. RAM) and so on.

 The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings are also considered. It is the scope of protection of the present invention.

Claims

Rights request

1. A method for inter-cell interference coordination, which is characterized by including:

The control base station of the first cell obtains the resource occupancy rate of the border user of the first cell; the control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell; The second cell is a neighboring cell of the first cell, and the resource occupancy rate of the boundary user of the first cell is used by the control base station of the second cell to configure almost empty subframes for downlink transmission;

The control base station of the first cell receives the almost empty subframe information configured by the control base station of the second cell, and the almost empty subframe information is used to indicate the time domain position of the almost empty subframe for downlink transmission of the second cell;

The control base station of the first cell schedules the boundary user of the first cell on the subframe for downlink transmission of the first cell according to the almost empty subframe information, and the time domain position of the subframe is consistent with the The time domain positions of the almost empty subframes sent in the downlink of the second cell are the same.

2. The inter-cell interference coordination method according to claim 1, characterized in that, the control base station of the first cell obtains the resource occupancy rate of the boundary user of the first cell, including: Control the base station to receive a measurement report reported by the user equipment of the first cell, where the measurement report includes the reference signal received power RSRP ^P of the first cell and the reference signal received power RSRP ^M of the second cell;

If RSRP ^M -Bias < RSRP ^P < RSRP ^M , it is determined that the user equipment is the boundary user of the first cell; if RSRP ^P < RSRpM -Bias or RSRP ^P > RSRpM, it is determined that the user equipment is not the boundary user of the first cell. The boundary user of the first cell; where Bias is the preconfigured reference signal received power difference;

The control base station of the first cell counts the resource occupation of the border users of the first cell.

3. The inter-cell interference coordination method according to claim 2, characterized in that: the system The method for calculating the resource occupancy rate of the boundary user of the first cell includes:

Divide the number of resource blocks of the boundary users of the first cell by the number of all resource blocks of the first cell to obtain the resource occupancy rate of the boundary users of the first cell; or

Divide the number of resource blocks of the edge users of the first cell by the number of resource blocks of the edge frequency band of the first cell to obtain the resource occupancy rate of the edge users of the first cell.

4. The inter-cell interference coordination method according to any one of claims 1 to 3, characterized in that, before the control base station of the first cell obtains the resource occupancy rate of the boundary user of the first cell, it further includes:

When the first cell performs cell range expansion, the control base station of the first cell sends cell range extension configuration information to the control base station of the second cell; the cell range extension configuration information includes a cell range extension offset value, and The time to enable the cell range extension offset value; The cell range extension configuration information is used to notify the control base station of the second cell to change the cell range extension configuration;

The control base station of the first cell receives the cell range extension response information returned by the control base station of the second cell.

5. The inter-cell interference coordination method according to claim 1, characterized in that, the control base station of the first cell sends the resource occupancy rate of the boundary user of the first cell to the control base station of the second cell, include:

The control base station of the first cell occupies the resources of the boundary users of the first cell through the X2 interface, or through the S1 interface, or through the operation management and maintenance center OAM, or through the interface between the base station and the base station coordinator. rate is sent to the control base station of the second cell.

6. A base station, characterized by including:

The acquisition unit is used to acquire the resource occupancy rate of the boundary user of the first cell;

A sending unit, configured to send the resource occupancy rate of the boundary user of the first cell to the control base station of the second cell; the second cell is an adjacent cell of the first cell, and the boundary of the first cell The resource occupancy rate of the user is used by the control base station of the second cell to configure downlink transmission. almost empty subframes;

A receiving unit, configured to receive the almost empty subframe information configured by the control base station of the second cell; the almost empty subframe information is used to indicate the time domain position of the almost empty subframe for downlink transmission of the second cell; and

A scheduling unit configured to schedule the boundary user of the first cell on the subframe for downlink transmission of the first cell according to the almost empty subframe information, and the time domain position of the subframe is consistent with the second The time domain positions of almost empty subframes sent in downlink of the cell are the same.

7. The base station according to claim 6, wherein the obtaining unit specifically includes: a receiving subunit, configured to receive a measurement report reported by the user equipment of the first cell, where the measurement report includes the third The reference signal received power RSRP ^P of one cell and the reference signal received power RSRP ^M of the second cell;

Determining subunit, used to determine that the user equipment is the boundary user of the first cell if RSRP ^M -Bias RSRP ^P < RSRP ^M ; if RSRP ^P < RSRPM -Bias or RSRP ^P > RSRP ^M , then determine that the user equipment is the boundary user of the first cell; The user equipment is not a boundary user of the first cell; Where, Bias is the preconfigured reference signal received power difference; and

The processing subunit is configured to count the resource occupancy rate of the boundary users of the first cell.

8. The base station according to claim 7, characterized in that the processing subunit is further used to:

Divide the number of resource blocks of the boundary users of the first cell by the number of all resource blocks of the first cell to obtain the resource occupancy rate of the boundary users of the first cell; or divide the boundary of the first cell The number of resource blocks of the user is divided by the number of resource blocks of the edge frequency band of the first cell to obtain the resource occupancy rate of the edge user of the first cell.

9. The base station according to any one of claims 6 to 8, characterized in that,

The sending unit is also configured to: when the first cell performs cell range expansion, send cell range extension configuration information to the control base station of the second cell; the cell range extension configuration information includes a cell range extension offset value , and the time to enable the cell range extension offset value; The cell range extension configuration information is used to notify the control base station of the second cell to change the cell range extension configuration;

The receiving subunit is also configured to: receive cell range extension response information returned by the control base station of the second cell.

10. A communication system, characterized by including a control base station of the first cell and a control base station of the second cell;

The control base station of the first cell is the base station according to any one of claims 6 to 9; the control base station of the second cell is configured to configure downlink according to the resource occupancy rate of the border users of the first cell. The almost empty subframe is sent, and the almost empty subframe information is sent to the control base station of the first cell.

11. The communication system according to claim 10, wherein the control base station of the second cell includes:

A comparison unit configured to compare the resource occupancy rate of the boundary user of the first cell with a first threshold value and a second threshold value respectively; the first threshold value is smaller than the second threshold value; and a configuration unit configured to reduce the number of almost empty subframes sent in downlink by the second cell if the resource occupancy rate of the boundary user of the first cell is less than the first threshold value, 1^ >1; If the resource occupancy rate of the boundary user of the first cell is greater than the second threshold value, then the almost empty subframes for downlink transmission of the second cell are increased by N ₂ , N ₂ >1; if the first cell The resource occupancy rate of the border users of the first cell is greater than or equal to the first threshold value, and the resource occupancy rate of the border users of the first cell is less than or equal to the second threshold value, then the second cell will not be changed. The number of almost empty subframes sent in the downlink.

12. The communication system according to claim 10 or 11, characterized in that the control base station of the first cell is further used to pass the X2 interface, or pass the S1 interface, or pass the operation management and maintenance center OAM, or pass the operation management and maintenance center OAM. The interface between the base station and the base station coordinator transmits the resource occupancy rate of the boundary user of the first cell to the control base station of the second cell;

The control base station of the second cell is further configured to use the X2 interface or the S1 interface. The almost empty subframe information is transmitted to the control base station of the first cell through the interface, or through OAM, or through the interface between the base station and the base station coordinator.

13. A method for inter-cell interference coordination, characterized by: including:

The control base station of the first cell obtains the resource occupancy rate of the border user of the first cell; the control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell; The second cell is a neighboring cell of the first cell, the control base station of the first cell and the control base station of the second cell are different base stations, and the first cell and the second cell Have the same carrier; The resource occupancy rate of the boundary user of the first cell is used by the control base station of the second cell to configure an almost empty subframe for downlink transmission;

The control base station of the first cell receives interference information from the control base station of the second cell; the interference information includes almost empty subframe information, and the almost empty subframe information is used to indicate the almost empty subframe information of the downlink transmission of the second cell. The time domain position of the empty subframe;

The control base station of the first cell controls the switch of the first cell according to the interference information.

14. The inter-cell interference coordination method according to claim 13, characterized in that the control base station of the first cell obtains the resource occupancy rate of the boundary user of the first cell, including: Control the base station to receive a measurement report reported by the user equipment of the first cell, where the measurement report includes the reference signal received power RSRP ^P of the first cell and the reference signal received power RSRP ^M of the second cell;

If RSRP ^M -Bias < RSRP ^P < RSRP ^M , then it is determined that the user equipment is the boundary user of the first cell; if RSRP ^P < RSRP ^M -Bias or RSRP ^P > RSRP ^M , then it is determined that the user equipment is not The boundary user of the first cell; Where, Bias is the preconfigured reference signal received power difference;

The control base station of the first cell counts the resource occupation of the border users of the first cell.

15. The inter-cell interference coordination method according to claim 14, characterized in that: The method for the control base station of the first cell to count the resource occupancy rate of the border users of the first cell includes:

Divide the number of resource blocks of the boundary users of the first cell by the number of all resource blocks of the first cell to obtain the resource occupancy rate of the boundary users of the first cell; or

Divide the number of resource blocks of the edge users of the first cell by the number of resource blocks of the edge frequency band of the first cell to obtain the resource occupancy rate of the edge users of the first cell.

16. The inter-cell interference coordination method according to claim 13, characterized in that, before the control base station of the first cell obtains the resource occupancy rate of the boundary user of the first cell, it further includes:

When the first cell performs cell range expansion, the control base station of the first cell sends cell range extension configuration information to the control base station of the second cell; the cell range extension configuration information includes a cell range extension offset value. , and the time to enable the cell range extension offset value; the cell range extension configuration information is used to notify the control base station of the second cell to change the cell range extension configuration;

The control base station of the first cell receives the cell range extension response information returned by the control base station of the second cell.

17. The inter-cell interference coordination method according to any one of claims 13 to 16, characterized in that the control base station of the first cell controls the switch of the first cell according to the interference information, including:

The control base station of the first cell compares the interference information with a preset threshold value, and determines whether the first cell needs to be shut down based on the comparison result;

If the first cell needs to be shut down, switch the user equipment in the first cell to the third cell, and shut down the first cell;

If there is no need to shut down the first cell, switch the boundary user of the first cell to the third cell without shutting down the first cell;

Wherein, the control base station of the first cell and the control base station of the third cell are the same. A base station, and the first cell and the third cell have different carriers.

18. The inter-cell interference coordination method according to claim 17, wherein the interference information further includes a high interference indication H1, an overload indication 01, a relative narrowband transmit power RNTP, a block error rate BLER, and a channel quality indicator CQI. at least one of them.

19. The inter-cell interference coordination method according to claim 13, characterized in that: the control base station of the first cell sends the resource occupancy rate of the border user of the first cell to the control base station of the second cell, including: : The control base station of the first cell transfers the resources of the boundary users of the first cell through the X2 interface, or through the S1 interface, or through the operation management and maintenance center OAM, or through the interface between the base station and the base station coordinator. The occupancy rate is transmitted to the control base station of the second cell.

20. A base station, characterized by including:

The acquisition unit is used to acquire the resource occupancy rate of the boundary user of the first cell;

A sending unit, configured to send the resource occupancy rate of the boundary user of the first cell to the control base station of the second cell; the second cell is an adjacent cell of the first cell, and the control of the first cell The base station and the control base station of the second cell are different base stations, and the first cell and the second cell have the same carrier; the resource occupancy rate of the boundary user of the first cell is controlled by that of the second cell. The control base station is used to configure almost empty subframes for downlink transmission;

A receiving unit, configured to receive interference information from the control base station of the second cell, where the interference information includes almost empty subframe information; the almost empty subframe information is used to indicate the almost empty subframe of downlink transmission of the second cell. time domain position; and

A control unit, configured to control the switch of the first cell according to the interference information.

21. The base station according to claim 20, wherein the obtaining unit specifically includes: a receiving subunit, configured to receive a measurement report reported by the user equipment of the first cell, and the measurement report includes the third The reference signal received power RSRP ^P of one cell and the reference signal received power RSRP ^M of the second cell;

Determination subunit, used to determine the user if RSRP ^M -Bias RSRP ^P < RSRP ^M The device is a border user of the first cell; if RSRP ^P < RSRPM -Bias or RSRP ^P > RSRP ^M , it is determined that the user equipment is not a border user of the first cell; where Bias is a preconfigured reference signal Received power difference; and

The processing subunit is configured to count the resource occupancy rate of the boundary users of the first cell and send the statistics to the control base station of the second cell.

22. The base station according to claim 21, characterized in that the processing subunit is further used to:

Divide the number of resource blocks of the boundary users of the first cell by the number of all resource blocks of the first cell to obtain the resource occupancy rate of the boundary users of the first cell; or divide the boundary of the first cell The number of resource blocks of the user is divided by the number of resource blocks of the edge frequency band of the first cell to obtain the resource occupancy rate of the edge user of the first cell.

23. The base station according to claim 20, characterized in that,

The sending unit is also configured to: when the first cell performs cell range expansion, send cell range extension configuration information to the control base station of the second cell; the cell range extension configuration information includes a cell range extension offset value , and the time to enable the cell range extension offset value; the cell range extension configuration information is used to notify the control base station of the second cell to change the cell range extension configuration;

The receiving subunit is also configured to: receive cell range extension response information returned by the control base station of the second cell.

24. The base station according to any one of claims 20 to 23, characterized in that the control unit includes:

A judgment subunit, used to compare the interference information with a preset threshold value, and judge whether the first cell needs to be shut down according to the comparison result; and

The coordination subunit is configured to, if the first cell needs to be shut down, switch the user equipment in the first cell to the third cell, and shut down the first cell; if the first cell does not need to be shut down, Then the boundary user of the first cell is switched to the third cell without closing the third cell. a neighborhood;

Wherein, the control base station of the first cell and the control base station of the third cell are the same base station, and the first cell and the third cell have different carriers.

25. A communication system, characterized by including a control base station of the first cell and a control base station of the second cell;

The control base station of the first cell is the base station according to any one of claims 20 to 24; the control base station of the second cell is configured to configure downlink according to the resource occupancy rate of the border users of the first cell. The almost empty subframe is sent, and the almost empty subframe information is sent to the control base station of the first cell.

26. The communication system according to claim 25, wherein the control base station of the second cell includes:

A comparison unit configured to compare the resource occupancy rate of the boundary user of the first cell with a first threshold value and a second threshold value respectively; the first threshold value is smaller than the second threshold value; and a configuration unit configured to reduce the number of almost empty subframes sent in downlink by the second cell if the resource occupancy rate of the boundary user of the first cell is less than the first threshold value, 1^ >1; If the resource occupancy rate of the boundary user of the first cell is greater than the second threshold value, then the number of almost empty subframes for downlink transmission of the second cell increases by N ₂ , N ₂ >1; if the first cell The resource occupancy rate of the border users of the first cell is greater than or equal to the first threshold value, and the resource occupancy rate of the border users of the first cell is less than or equal to the second threshold value, then the second cell will not be changed. The number of almost empty subframes sent in the downlink.

27. The communication system according to claim 25 or 26, characterized in that the control base station of the first cell is further used to: through the X2 interface, or through the S1 interface, or through the operation management and maintenance center OAM, or through the The interface between the base station and the base station coordinator transmits the resource occupancy rate of the boundary user of the first cell to the control base station of the second cell;

The control base station of the second cell is further configured to transmit the interference to the base station through the X2 interface, or through the S1 interface, or through OAM, or through the interface between the base station and the base station coordinator. The information is transmitted to the control base station of the first cell.

28. A method for inter-cell interference coordination, characterized by including:

The control base station of the third cell receives the interference information issued by the control base station of the second cell; the interference information includes the downlink transmission configured by the control base station of the second cell according to the resource occupancy rate of the boundary user of the first cell. The number of empty subframes;

The control base station of the third cell controls the switch of the third cell according to the interference information;

Wherein, the first cell, the second cell and the third cell are adjacent cells; the control base station of the first cell, the control base station of the second cell and the control base station of the third cell are different base stations, and the first cell, the second cell and the third cell have the same carrier.

29. The inter-cell interference coordination method according to claim 28, characterized in that the control base station of the third cell controls the switch of the third cell according to the interference information, including: the third cell The control base station compares the interference information with a preset threshold value, and determines whether the third cell needs to be closed based on the comparison result;

If the third cell needs to be turned off, the third cell is turned off, and the fourth cell is turned on; if the third cell does not need to be turned off, the third cell is not turned off, and the fourth cell is not turned on. ;

Wherein, the control base station of the third cell and the control base station of the fourth cell are the same base station, and the third cell and the fourth cell have different carriers.

30. The inter-cell interference coordination method according to claim 28 or 29, characterized in that the interference information also includes high interference indication H1, overload indication O1, relative narrowband transmit power RNTP, block error rate BLER, channel quality Indicates at least one of the CQIs.

31. A base station, characterized by: including:

A receiving unit configured to receive interference information issued by the control base station of the second cell; the interference information includes the control base station of the second cell based on the resource occupancy of the boundary user of the first cell. utilization, the configured number of almost empty subframes sent in the downlink; and

A control unit configured to control the switch of the third cell according to the interference information;

Wherein, the first cell, the second cell and the third cell are adjacent cells; the control base station of the first cell, the control base station of the second cell and the control base station of the third cell are different base stations, and the first cell, the second cell and the third cell have the same carrier.

32. The base station according to claim 31, characterized in that the control unit specifically includes: a judgment subunit, used to compare the interference information with a preset threshold value, and judge whether it needs to be shut down according to the comparison result. the third cell; and

Coordination subunit, used to close the third cell and turn on the fourth cell if the third cell needs to be turned off; if the third cell does not need to be turned off, do not turn off the third cell, and do not Open the fourth cell;

Wherein, the control base station of the third cell and the control base station of the fourth cell are the same base station, and the third cell and the fourth cell have different carriers.