TW201438504A - Interference management method for wireless communication system, anchor apparatus, base station and system thereof - Google Patents

Abstract

An interference management method for wireless communication system, an anchor apparatus, a base station and a wireless communication system thereof are provided. The method includes the following method. Receiving at least one base station information according to the plurality of base stations. Finding at least one interference relationship of the base stations according to the base station information, and grouping the base stations into the at least one cluster according to the at least one interference relationship. At least one base station is in the at least one cluster. Deciding a selected group of uplink-downlink (UL-DL) configurations related to one or more clusters of the at least one cluster, wherein the selected group includes at least one of the UL-DL configurations. And, informing the base stations in the at least one cluster to chance the UL-DL configuration of the base stations according to the selected group of uplink-downlink (UL-DL) configurations.

Description

Interference management method for wireless communication system, anchor device, base station and system thereof

The present invention relates to interference management techniques in a wireless network.

In a cellular wireless network, a base station and a user equipment (UE) communicate with each other by using a downlink (DL) and an uplink (UL), which are called uplink-downlinks. Uplink-downlink (UL-DL) communication. In addition, the base stations 110~150 can also communicate with each other through specific application agreements to avoid mutual interference, user device takeover, etc.

The base station of the Time-Division Duplexing (TDD) using the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) will be reconfigured according to the current The UL-DL transmission condition is selected to select the corresponding UL-DL standard configuration, thereby increasing the transmission traffic. In the LTE TDD standard, many UL-DLs are set. The standard configuration.

Please refer to FIG. 1 and Table (1). FIG. 1 is a schematic diagram of a wireless communication system. In FIG. 1, the cell stations 110 to 150 select a UL-DL configuration according to their own UL-DL transmission conditions in accordance with the relevant settings shown in Table (1). Table (1) reveals seven configurations in the UL-DL standard configuration of 3GPP Long Term Evolution (LTE) TDD. Each UL-DL standard configuration is in units of a single frame, and each frame is preset with 10 subframes.

The cell base stations 110-150 select the corresponding UL-DL configuration according to the DL-UL transmission conditions. For example, the cell base stations 110, 120, 130, 140, 150 respectively select the UL-DL configurations 0, 3, 6, 1 and 5. . The cell base stations also have inter-base station communication links, such as inter-base station communication links 102, 104, 106 between base stations 110 and 120, 120 and 130, and 140 and 150, respectively. Figure The information of each configuration is respectively shown in 1B, wherein the DL to UL (DL-to-UL) switching point period is 5 ms or 10 ms, and the configuration of the subframes 0-9 can be referred to in the table of FIG. 1B. In Table (1), "D" is a subframe for downlink transmission; "S" is a special subframe for Guard time; "U" is a subframe for uplink transmission.

When Cell Allocation 120 employing "Configuration 3" has a transmission of DL 101 in subframes 7 and 8, it may cause adjacent cell base station 110 that uses configuration 0 to receive UL 103 in subframes 7 and 8. Serious interference. The reason is that the power of the cell base station 120 in transmitting the DL 101 is much greater than the power of the user equipment UE transmitting the UL 103. If the UE and the neighboring pico base station are both transmitting and selecting different configurations, the UE's UL-signal-to-interference noise ratio (SINR) is more severely affected by the DL interference of the neighboring pico base station. . Therefore, how to slow down the interference between base stations is an important issue in LTE TDD wireless network technology.

In addition, cellular information used for communication between multiple Evolved Node Base stations (eNBs) is very important in interference management technology. In this way, interference management techniques based on cell information exchange are being studied.

The present disclosure provides an interference management method, an anchor device, a base station, and a system thereof for a wireless communication system, which can manage interference by load information transmitted between base stations.

An embodiment of the present disclosure provides an interference management method for a wireless communication system, wherein the wireless communication system includes a plurality of base stations. The interference management method includes the following steps. A corresponding at least one base station information is received from the base station, wherein the base station uses a selected uplink-downlink (UL-DL) configuration to communicate with a corresponding user equipment. And searching for the interference relationship between the base stations according to the base station information, and dividing the base station into at least one cluster according to the interference relationship. Each cluster has at least one base station, and base stations in the same cluster may have interference relationships. A specific UL-DL configuration group corresponding to each cluster is determined, and each specific UL-DL configuration group includes at least one UL-DL configuration. And, each base station in each cluster is notified, so that each base station adjusts the UL-DL configuration of each base station according to the specific UL-DL configuration group.

One embodiment of the present disclosure provides a wireless communication system including an anchor device and a plurality of base stations. These base stations communicate with the anchor device. The anchor device receives corresponding at least one base station information from the base station. The base station uses at least one uplink-downlink (UL-DL) configuration to communicate with corresponding user equipment. The anchor device searches for the interference relationship between the base stations according to the base station information, and divides the base station into at least one cluster having at least one base station according to the interference relationship, and determines each cluster corresponding A specific UL-DL configuration group, each specific UL-DL configuration group including at least one UL-DL configuration. The anchor device notifies the base station in the at least one cluster to cause the base station to adjust the UL-DL configuration of the base station according to the specific UL-DL configuration group.

An embodiment of the present disclosure provides an anchor device suitable for multiple Base station wireless communication system. The anchor device includes a transceiver and a processor. The transceiver receives corresponding at least one base station information from the base station. The base station uses at least one uplink-downlink (UL-DL) configuration to communicate with corresponding user equipment. A processor is coupled to the transceiver. The processor searches for the interference relationship between the base stations according to the base station information, and divides the base station into at least one cluster having at least one base station according to the interference relationship, and determines a specific one of the at least one cluster A UL-DL configuration group, the specific UL-DL configuration group including at least one UL-DL configuration. And, the processor transmits the base station in the at least one cluster through the transceiver, so that the base station adjusts the UL-DL configuration of each base station according to the specific UL-DL configuration group.

One embodiment of the present disclosure provides a wireless communication system including a first base station and a second base station. The first base station transmits information directly or indirectly to the second base station. This information includes multiple overload information. The overload information respectively corresponds to a plurality of subframes or a plurality of subframe groups, and each subframe group includes at least one subframe. The overload information is used to indicate the degree of interference corresponding to each physical resource block in each subframe of the first base station.

One embodiment of the present disclosure provides a wireless communication system including a first base station and a second base station. The first base station transmits information directly or indirectly to the second base station. The information includes at least one of the high-interference information, and each of the high-interference information corresponds to a physical resource block in one target base station and at least one subframe. When the high interference information is a specific content, it indicates that the first base station that issues the high interference information has been interfered by the second base station.

An embodiment of the present disclosure provides a base station suitable for a wireless communication system having the base station and another base station, the base station including: a transceiver and a processor, the transceiver directly or indirectly transmitting Corresponding at least one base station information to the other base station; the processor coupled to the transceiver, the processor transmitting a message to the another base station through the transceiver, wherein the information includes multiple overload information The overload information respectively corresponds to a plurality of subframes or a plurality of subframe groups, wherein the subframe group includes at least one subframe, and the overload information is used to indicate each physical resource region in each subframe of the first base station. The degree of interference corresponding to the block.

An embodiment of the present disclosure provides a base station, which is applicable to a wireless communication system including the base station and another base station. The base station includes: a transceiver and a processor, and the transceiver directly or indirectly transmits a corresponding At least one base station information to the other base station; the processor coupled to the transceiver, the processor transmitting a message to the another base station through the transceiver, wherein the information includes at least one high interference Information, each of the high-interference information respectively corresponding to a physical resource block in a target base station and at least one subframe, and when the high-interference information is a specific content, indicating the first base that sends the high-interference information The station has been disturbed by the second base station.

Based on the above, the interference management method, the anchor device, the base station and the system thereof provided by the disclosure can enable the base stations with mutual interference to select each other in the same UL-DL configuration group by using the load information transmitted between the base stations. UL-DL configuration with low interference relationship to manage interference. In addition, the base station can explicitly know the physical resource blocks in each UL and DL subframe by using the interference overload indication in the load information. The interference situation enables the base station to dynamically transmit data through resource blocks with low interference. The base station can also learn the interference situation between the base stations by the high interference information in the load information. Based on the above, various embodiments of the present disclosure manage interference by load information transmitted between base stations.

The above described features and advantages of the present invention will be more apparent from the following description.

101‧‧‧downlink

102, 104, 106, 530‧‧‧ base station communication links

103‧‧‧Uplink

110~150, 210~250, 510, 520, ‧‧‧ cell base station/base station

200‧‧‧Wireless communication system

C1~C3‧‧‧ cluster

S210~S240‧‧‧Steps

UE‧‧‧User equipment

OI1, OI2‧‧‧Interference overload indication/UL interference overload indication

HII‧‧‧High interference information

1 is a schematic diagram of a wireless communication system.

2 is a flow chart of an interference management method for a wireless communication system in accordance with an embodiment of the present disclosure.

3A and 3B are schematic diagrams showing an interference management method of a wireless communication system according to an embodiment of the present disclosure.

4 is a schematic diagram of signal transmission between base stations in accordance with an embodiment of the present disclosure.

5 through 7 are schematic diagrams of a wireless communication system 500 consistent with an embodiment of the present disclosure.

FIG. 8 is a schematic diagram of a wireless communication system 800 consistent with an embodiment of the present disclosure.

The disclosure provides a small cell wireless network (small cell) Techniques of some exemplary embodiments of interference management in wireless networks. The techniques described in this disclosure can be used in a variety of wireless communication networks, such as Worldwide Interoperability for Microwave Access (WiMAX) Time Division Duplex (TDD), Long Term Evolution (LTE). Divided into duplex (TDD), and other networks. For clarity of description, the technology in this disclosure is illustrated by LTE. There are general cell base stations and small cell base stations in the wireless communication network. The "cell" described in the present disclosure is a base station. The small cell base station is, for example, a femtocells, picocells, microcells, or a base station of an evolved node (eNB).

The small cell wireless network cell can cover two networks, such as a homo network and a hetero network. The network that can be operated can be, but is not limited to, only a small cell base station. (pico cells or femtocells, etc.), or include minicells and macrocells, or just large cells. The method of some exemplary embodiments for interference management can be applied to any node, and the neighboring nodes can also be any type of node.

Interference management can be applied to any type of cellular network node. In the following, for one of the various exemplary embodiments, a pico base station for small cells in a small cell wireless network is described, but is not limited thereto. The interference management method in this example can be in the pico base station. It can be implemented in other small cell base stations or in the environment of coexisting small cell base stations and ordinary cell base stations.

In the method of some exemplary embodiments proposed for interference management in small cell wireless networks, the present invention provides for negotiation between different pico base stations for interference management. Through these negotiations, the UL-DL configuration is selected in consideration of interference between adjacent pico base stations, and interference from neighboring pico base stations is managed.

A node or base station of a cellular network can include a transceiver and a processor. The transceiver is for transmitting and receiving wireless signals with a base station in a wireless network. The base station employs at least one of a plurality of uplink-downlink (UL-DL) configurations at the time of transmission, and the pico base station has multiple predetermined criteria (all available criteria or At least one of the adjacent base stations is determined by a combination of partial criteria. The processor is coupled to the transceiver and for negotiating with at least a portion of an adjacent base station to determine UL of the pico base station and the portion of the neighboring base station when transmitting at the pico base station The DL configuration, otherwise, the neighboring base stations may flexibly select the UL-DL configuration for transmission, that is, the neighboring base stations may freely decide the UL-DL configuration for transmission according to their respective needs.

In LTE, cellular information exchanged between evolved node base stations (eNBs) can be implemented using an X2 application protocol (X2AP). The X2 application protocol (X2AP) provides a corresponding process for exchanging cellular information between multiple evolved node base stations. Cell information can include the following Information: eNB configuration, load information, cell startup scenarios, and resource status returns...etc. For example, the load information may include Cell Authentication, High Interference Information (HII), Relative Narrowband Tx Power (RNTP), Almost Blank Subframe (ABS) information, and DL. Overload Indication (OI), as shown in the load information list in Table (2).

In Table (2), "M" indicates that such a group name is necessary in the cell information, such as the type of information, the cell identification code (ID) in the cell information item, and the target cell identification code in the UL height interference information. And UL height interference instructions. “0” indicates that such group name is selectively present in the cell information, such as UL interference overload indication (OI), relative narrowband transmission power (RNTP), and near blank subframe (ABS) in the cell information item. ) Information, call indication. "<maxCellineNB>" indicates the maximum number of cell base stations, and the value can be 256. The "IE category and reference" indicates that the application of this embodiment can be related to the principle according to the relevant technical description of 3GPP.

In the cell information received by a specific cell base station, HII is used to indicate that a part of the physical resource block (PRB) may have a high degree of UL interference. An entity resource block is a unit used to indicate a specific wireless resource. RNTP is used to indicate whether the DL transmission power in each physical resource block (PRB) is lower than a preset RNTP threshold. The ABS information is used to describe the subframes marked as nearly blank by the transmitting eNB. OI is used to illustrate the UL of the PRB in each subframe Disturb level. Under the purpose of interference coordination, the load information can be used to allow each base station to manage interference through the arrangement of the transmission link and the resource block. However, in the current agreement, the OI uses only one set of UL interference levels to represent the interference state of all UL sub-detections. The first value of this set of UL interference levels indicates the average interference level of the first PRB of all UL sub-detections. The two values represent the average interference level of the second PRB of all UL sub-detections, and so on. Since DL-UL interference may only occur in some conflicting subframes transmitted between eNBs, instead of all UL subframes being highly interfered, the OI in the current agreement cannot allow each base station to target each UL subframe. PRB performs interference management arrangements.

On the other hand, a plurality of component carriers for information transmission, called Carrier Aggregation (CA), have been normalized in the LTE wireless network. Component carriers having a bandwidth of 1.4, 3, 5, 10, 15, or 20 MHz are grouped together in a PHY layer to increase the amount of data transmission per UE. In CA, the load information may need to carry more details of each component carrier.

Accordingly, the present disclosure proposes the following interference management method, anchor device, base station, and wireless communication system therefor. This interference management method can be designed to flexibly mitigate DL-UL interference: Flexible Clustering-based Interference Management method with Centralized Control (CFCIM) and Flexible Cluster-based Interference Management with Discrete Control Method (Flexible Clustering-based Interference Management method with Distributed Control; DFCIM). At CFCIM and DFCIM There are one or more cell clusters in it. The active transmission of all cells in each cell cluster will use the same uplink or downlink on a subset of each subframe, or a cluster of cells that may interfere with each other will be set by the interference management method of this embodiment. The UL-DL configuration in which the lower interference relationship is selected in the UL-DL configuration group enables eNB-to-eNB interference and UE-to-UE interference to be mitigated in the same cell cluster.

2 is a flow chart of an interference management method for a wireless communication system according to an embodiment of the present disclosure. FIGS. 3A and 3B are schematic diagrams showing an interference management method of a wireless communication system according to an embodiment of the present disclosure, and FIG. 4 is a schematic diagram of FIG. A schematic diagram of signal transmission between base stations is disclosed in an embodiment. In FIGS. 3A, 3B, and 4, the wireless communication system 200 includes a plurality of base stations, such as picocell base stations 210-240 and a microcell base station 250. Each base station should have a radio transceiver and a processor. In one embodiment, the wireless communication system 200 uses the microcell base station 250 as an anchor device. In other embodiments consistent with the disclosure, one of the base stations may be selected as the anchor device from the wireless communication system 200, or a single station or an eNB may be specifically set up as an anchor device, thereby implementing the disclosure. Interference management method. Each base station uses the various uplink-downlink (UL-DL) configurations described above to communicate with corresponding user equipment UEs located within the base station communication range.

Referring to FIG. 2, FIG. 3A and FIG. 4 simultaneously, in step S210, the micro cell base station 250 can receive corresponding at least one base station information from the base stations 210-240 in the wireless communication system 200 periodically or non-periodically. These base stations Interest can also be called cell information. The base station information includes at least one or more of a UL-DL configuration in the base station, a startup situation of the base station, and a resource status report, in addition to the load information. The load information includes at least one overload information corresponding to each subframe in the UL-DL configuration, respectively. These overload information allows the microcell base station 250 to determine the UL-DL configuration of the base station in each cluster. The load information may further include one or at least one UL Height Interference Information (HII), and each UL Height Interference Information corresponds to one target base station and one physical resource block in one or more subframes, respectively. Further, when the UL height interference information is specific content (for example, the values in the UL height interference information are all "0", all are "1", the specific number is "1", the others are "0", and the specific number is When the value is "0" and the other is "1", and the values are 1 and 0 or the mutual interval between 0 and 1, etc., it means that the base station that has issued these UL height interference information has been interfered. The load information may also be provided with another indication information for indicating that the high interference information indicates that the first base station has been interfered by the second base station, and the other indication information is used to indicate that the first base station may be second. A specific one or several physical resource blocks in a subframe interfered by the base station. In this embodiment, the high interference information herein may correspond to different subframes, or one high interference information may correspond to two or more subframes. In other words, these subframes can be divided into a plurality of subframe groups, each of which includes one or at least one subframe.

In step S220, the micro cell base station 250 searches for the interference relationship between the base stations 210-240 according to the base station information, and divides the base stations 210-240 into at least one cluster according to the interference relationship. Each cluster has One base station is less, and multiple base stations in the same cluster will interfere with each other.

3A, the micro cell base station 250 can know from the load information in the base station information, the UL-DL configuration, the startup situation of the base station, and the resource status report, etc., that it is possible to know between the base stations 210 and 220. Mutual interference, the base stations 220, 230 may interfere with each other, and the base station 240 does not interfere with the base stations 210, 230. Thereby, the micro cell base station 250 divides the base stations 210, 230 which may interfere with each other into the same group C1, and divides the base station 240 into another group (for example, the second group C2).

In step S230, the micro cell base station 250 may further determine a corresponding UL-DL configuration group for all the base stations in the at least one cluster by using the base station information. Each UL-DL configuration group may have one or more UL-DL configurations as shown in Table (1). In an embodiment of the present disclosure, the microcell base station 250 may also determine a specific UL-DL configuration group in each cluster by negotiating with the base stations 210-240. The negotiation may include mutual transmission of at least one cellular information, and the microcell base station 250 may reform these base station clusters based on information possessed by each of the base stations 210-240. It is worth noting that some of the dormant or dead base stations do not necessarily participate in the above subgroup or UL-DL configuration.

When at least one UL-DL configuration is included in the specific UL-DL configuration group, the selected UL-DL configuration may have a UL-DL configuration with a similar UL/DL subframe number arrangement, and a DL with the same periodicity. The UL-DL configuration of the UL switching point, or the UL-DL configuration with theoretically less interference. For example, as shown in Table (1) Between UL-DL configuration 0 and UL-DL configuration 6, there is a possibility that signal interference may occur in subframe 9, and subframes 0 to 8 of UL-DL configuration 0 and UL-DL configuration 6 are the same UL or each other. DL settings. Therefore, UL-DL configuration 0 and UL-DL configuration 6 can be included in a specific UL-DL configuration group.

In step S240, the micro cell base station 250 notifies the base stations in each cluster, so that the base stations 210-240 adjust the UL-DL configurations of the respective base stations 210-240 themselves according to the specific UL-DL configuration group. For example, the base stations 210-230 in the cluster C1 are all notified by the micro cell base station 250 to select one of the UL-DL configurations from the specific UL-DL configuration group (including UL-DL configuration 0 and UL-DL configuration 6) described above. The UL-DL configuration of the base stations 210 to 230 themselves is set. In this embodiment, the base stations 210-230 may select one of the UL-DL configuration 0 and the UL-DL configuration 6 to perform setting and adjustment of the UL-DL configuration. The base stations 210-230 can select a preferred UL-DL configuration from the specific UL-DL configuration group according to their own data transmission requirements. The base station 240 in the cluster C2 can adjust the corresponding UL-DL configuration according to the requirements of its UL and DL, and does not need to have the same UL-DL configuration as other base stations. In other words, the anchor device of the present embodiment (for example, the micro cell base station 250) sets the base stations in the same cluster to the same or less interfered UL-DL configuration. After the end of step S240, the microcell base station 250 may also periodically or non-periodically return to step S210 to continue the interference relationship determination of each of the base stations 210-240 and group the base stations. Thereby, the wireless communication system 200 can effectively and actively mitigate or avoid interference between the base stations 210-240 in principle.

Specifically, in step S240, when the original UL-DL configuration of a certain base station is already a specific UL-DL configuration determined by the anchor device, the anchor device may not notify the base station to adjust its UL. - DL configuration to reduce the communication load between base stations.

The disclosure further illustrates FIGS. 2 and 4 with the embodiment of FIG. 3B as an example. When the base station 220 stops operating for some reason, the micro cell base station 250 will know it in the base station information received in step S210. When the base stations 210, 230 originally assigned to the same cluster C1 do not have an interference situation (i.e., there is no mutual interference), the micro cell base station 250 assigns these base stations 210, 230 to different clusters. For example, in FIG. 3B, the microcell base station 250 assigns the base station 210 to the cluster C1 and the base station 230 to the cluster C3. Thereby, since the base stations 210, 230, and 240 do not have an interference situation, the associated UL-DL configuration can be arbitrarily adjusted according to the needs of the respective base stations.

An embodiment of the interference management method of the present disclosure can also be applied to a distributed wireless communication system. For example, if the anchor device in FIGS. 3A, 3B is changed by one of the base stations 210-240 (for example, the base station 210), the micro cell base station 250 is not required. The transceiver of the base station 210 receives the base station information from the plurality of base stations 210-240 periodically or non-periodically (step S210 of Fig. 2). The processor of the base station 210 searches for the interference relationship between the base stations 210-240 according to the base station information, and divides the base stations 210-240 into at least one cluster according to the interference relationship (step S220 of FIG. 2). The processor of the base station 210 determines the UL-DL configuration for all the base stations in each cluster by using the above base station information. Set (step S230 of Fig. 2). In an embodiment of the disclosure, the processor of the base station 210 can determine a specific UL-DL configuration in each cluster through negotiation with the base stations 210-240. The negotiation may include mutual transmission of at least one cellular information, and the base station 210 may reform these base station clusters based on information owned by each of the base stations 210-240. The micro cell base station 250 notifies the base stations in each cluster to adjust the UL-DL configuration of the base stations 210-240 to a specific UL-DL configuration (step S240 of Fig. 2).

The above interference management method uses the interference relationship of each base station to set the mutual interference station base stations to the same UL-DL configuration, thereby managing interference. Another aspect of the present disclosure can utilize information such as base station information, load information, etc. transmitted between base stations using the X2AP protocol, so that the base station can manage the interference by using the information. Please refer to FIG. 5. FIG. 5 is a schematic diagram of a wireless communication system 500 consistent with an embodiment of the present disclosure. The wireless communication system 500 is provided with at least two base stations 510, 520. It is assumed here that the UL-DL configuration of the base station 510 is configured as 0, the UL-DL configuration of the base station 520 is configured as 1, and the two adjacent base stations 510, 520 are sufficiently interfered with each other. The base stations 510, 520 can directly or indirectly transmit load information to each other by the X2AP protocol.

The first base station (e.g., base station 510) can notify the second base station (e.g., base station 520) of the load information having the plurality of overload information OI1. The overload information OI1, OI2 is used to indicate the degree of interference corresponding to each physical resource block in each subframe in the base stations 510, 520. In other words, the base station 520 can determine whether its UL-DL configuration needs to be adjusted by the load information sent by the base station 520. The following phase The load embodiment will describe the load information as well as the overload information in detail. Thereby, the base station 520 can confirm the interference in its UL-DL configuration according to the overload information, thereby adjusting its own UL-DL configuration, thereby avoiding UL-to-DL interference or other interference. In other words, in the interference management technique described in the present disclosure, overload information of a plurality of subframes can be used to judge the UL-DL configuration in each cluster. The multiple overload information herein may correspond to different subframes respectively, or one overload information OI may correspond to two or more subframes. In other words, these subframes can be divided into a plurality of subframe groups, each of which includes one or more subframes. The overload information may correspond to the subframes or the group of subframes, respectively. Multiple overload information may have different representation names, but each overload information has a similar structure or a similar set of interference levels.

The load information and overload information are described in detail here. The disclosure proposes a new form of load information under the 3GPP LTE and X2AP protocols, the load information comprising a plurality of UL interference overload information elements, thereby presenting interference of all UL subframes in each frame. The status is shown in the load information list in Table (3). In particular, the overload information described in the present disclosure is not limited to containing a data structure indicating an UL interference overload indication or a DL interference overload indication, and may include additional other similar structures. The high interference information is not limited to the UL high interference indication or the DL high interference indication, and may include other data structures of other similar structures, and the embodiment is not limited thereto.

table 3)

Table (3) differs from Table (2) in that the "value range" corresponding to the field ">>UL Interference Overload Indication (OI)" is adjusted from the original single group interference level value to be Multiple sets of values for each UL sub-frame (modified with the underline mark). <maxULSubframeinFrame> is the maximum value of the number of UL subframes that can be used in a single frame. In the present disclosure, <maxULSubframeinFrame> may be 6. Thereby, the base station that receives the load information can learn, by using the UL interference overload indication, each PRB interference situation in each UL subframe or a subframe group consisting of a specific subframe, and further assist the base station scheduling. The UEs served will be heavy Information is placed on PRBs with less interference and information is not allowed to be transmitted on PRBs with large interference. It is worth mentioning that, in the disclosure, <maxULSubframeinFrame> can also be other names or numbers. For example, the use of the number 10 can be used to indicate all the sub-detection interference states in the entire detection.

Please refer to FIG. 5 to illustrate the UL interference overload indication. The UL-DL configuration of the base stations 510, 520 and the corresponding UL interference overload indication are disclosed in FIG. In the disclosure, for convenience of description, the UL-DL configuration only reveals the contents of subframe 0 to subframe 4. The UL interference overload indication is that the base station 510, 520 detects whether each PRB interferes with data under the UL subframe, "L" is subject to low interference; "M" is moderately interfered; "H" is highly interfered . As can be seen from FIG. 5, the UL subframe 4 of the base station 510 is interfered by the DL subframe 4 of the base station 520, so that the plurality of UL interference overload indications OI1 of the base station 510 are all marked "H", and the inter-base station communication is performed. The link 530 is transmitted to the base station 520. The plurality of UL interference overload indications OI2 of the base station 520 are transmitted to the base station 510 by the inter-base station communication link 530 generated by the X2AP protocol. Through such judgments, possible inter-base station interference relationships can be found and can be used for base station grouping.

. Another embodiment of the present disclosure can be as shown in the load information list of Table (4).

Table 4)

The difference between Table (4) and Table (2) is that the field "Interference Overload Indication" is added to the detail of the field "> Cell Information Item", and its corresponding " The range of values is such that there are multiple values corresponding to each sub-frame in each frame (the modification is marked with a bottom line). Specifically, the interference overload indication here is used to present the interference situation of the UL and DL sub-detection, and the UL interference overload indication described in Table (3) only presents the interference situation of the UL sub-detection. The application of the embodiment may also allow the base station to select an interference overload indication corresponding to a specific subframe in which interference may occur, without receiving an interference overload indication corresponding to the subframe. For example, the base station may selectively receive an interference overload indication at each DL subframe or an interference overload indication for a particular subframe (eg, subframe 4 or 9). <maxSubframeinFrame> is the maximum value of the number of subframes that can be used in a single frame. In the disclosure, <maxSubframeinFrame> can be 10, or specifically The maximum value of a certain sub-frame group can be 5, 6, or 8.

The situation of Figure 5 occurs ideally between the base stations 510, 520 without a time gap, but the actual base stations 510, 520 may have a slight time gap. Therefore, in addition to the interference overload indication or the UL interference overload indication, the load information should also have a time stamp or other time reference value between the two base stations. Another embodiment of the present disclosure can be as shown in the load information list of Table (5).

Table (5) differs from Table (3) in that, in addition to the "value range" corresponding to the ">>UL Interference Overload Indication" modified for Table (2), the field "> Cell Information Item" is also present. The field "Time offset Indication" is added to the item (the modification is marked with the bottom line). The time offset indication is used to indicate a time reference value between the cell base station that received the load information and the cell base station that issued the load information, such as the time difference between the two base stations. Thereby, the cell base station that receives the load information can know the time difference between itself and the cell base station that issued the load information, so as to clearly know the PRB that is interfered with in the subframe. In some embodiments consistent with the disclosure, the time offset information may be replaced by time information of the base station. The time indication may be time information of the cell base station that sends the load information, and the value range may be represented by a floating point number or an integer. The cell base station that receives the load information can know the time reference value between itself and the cell base station that sent the load information by time indication and the time when the DL or UL is transmitted by itself, for example, two bases. The time difference between the stations.

6 is a schematic diagram of a wireless communication system 500 consistent with an embodiment of the present disclosure. Referring to FIG. 6, a UL interference overload indication and a time indication are illustrated. The difference from FIG. 5 is that due to the time difference between the base stations 510 and 520, FIG. 6 The partial UL subframe 3 and the partial UL subframe 4 of the base station 510 are interfered by the DL subframe 4 of the base station 520, so that the plurality of UL interference overload indications OI1 of the base station 510 are all indicated as "H" or "M". Further, the base station 510 transmits the load information including the UL interference overload indication OI1 and the time offset indication (or the time reference value) to the base station 520 via the inter-base station communication link 530.

In addition to allowing the UL interference overload indication in the load information to correspond to the time offset indication to better improve interference management, another embodiment of the present disclosure may also associate each interference overload indication with a relevant time offset indication, such as a table ( 6) The load information list is shown.

Table (6) differs from Table (4) in that, in addition to the addition of ">>Interference overload indication" in the details of the field "Cell information item" for Table (2), the field is also added. ">>Time offset Indication" (the modification is marked with the bottom line). The time offset indication is used to indicate the time of the cell base station that sent the load information.

FIG. 7 is a schematic diagram of a wireless communication system 500 consistent with an embodiment of the present disclosure. Referring to FIG. 7, an interference overload indication and a time indication are illustrated. The difference between FIG. 7 and FIG. 5 and FIG. 6 is that the interference overload indication of FIG. 7 displays the interference degree of the DL subframe in addition to the interference degree of the UL subframe. In other words, the interference overload indication of Figure 7 will show the degree of interference for all subframes. Due to the time difference between the base stations 510, 520, part of the UL subframe 3 and part of the UL subframe 4 of the base station 510 of FIG. 6 are interfered by the DL subframe 4 of the base station 520, so that multiple ULs of the base station 510 The interference overload indication OI1 is marked with "H" or "M". Further, the base station 510 transmits load information including the UL interference overload indication OI1 and the time offset indication (or time indication) to the base station 520 via the inter-base station communication link 530.

In the disclosure, new state load information having at least one carrier information element may be provided, and each bearer information unit may include an interference load indication information unit and corresponding time offset information. The time offset information can be replaced by the time information of the base station, as shown in Table (7).

Table (7)

For example, each bearer information may include a carrier identification, UL height interference information, relative narrowband transmission power (RNTP), Near Blank Subframe (ABS) information, and a DL interference overload indication. The UL height interference information further includes a cell ID (ie, a target cell identifier) in which the HLL occurs and a corresponding UL height interference indication.

The disclosure also adjusts for UL High Interference Information (HII), thereby making the use of UL high interference information more widely available. Please refer to FIG. 8. FIG. 8 is a schematic diagram of a wireless communication system 800 consistent with an embodiment of the present disclosure. The UL subframe 4 of the base station 810 has been interfered by the DL subframe 4 of the base station 820. The base station that transmits UL high-interference information (HII) is 810, and receives the base with UL high-interference information. The station is called 820. When the base station 820 receives the value of the UL height interference information as "1", it indicates that the specific PRB corresponding to the value is the specific PRB that the base station 810 wants to use to transmit the UL signal of the user equipment (UE), please The base station 820 does not use this specific PRB for the time being, and can slow down the interference of the user equipment (UE) under the base station 810 to the base station 820. In contrast, when the value received by the base station 820 in the UL height interference information is “0”, it indicates that the base station 820 can arbitrarily use the specific PRB corresponding to the value.

However, UL high-interference information and other information cannot allow the base station 810 that sends the load information to actively notify other base stations (for example, 820) that "the base station 820 is already interfering with me (base station 810), please avoid"...etc. Similar information to adjust the transmission interference. Thereby, the base station 810, 820 according to the present disclosure can convey the information that the base station 820 is already interfering with me (base station 810), please avoid it by the UL height interference information of the specific content, thereby increasing the UL height. Application of interference information. The specific content of such UL height interference information may be that all values are set to "0" or are separated by values of "0" and "1". Since the load information includes a base station identification code sent to another base station (for example, 820), the base station 810 can send the load information to a specific adjacent base station, so that the adjacent base stations can judge themselves. Whether the interference is also generated by the base station 820 is also used to prevent the UL-DL configuration or the PRB physical resource block allocation. The base station 810 can also broadcast the above load information, and other base stations will not be misjudged because of the base station identification code in the load information.

In particular, the base station can be used with the appropriate bit length (example A bitmap of 10 bits) indicates that one or several UL subframes in a particular number or particular entity resource block belong to the first cluster, and other UL subframes belong to the second cluster. The load information list of Table (8) presents the content of possible additional UL interference overload indications.

The difference between Table (8) and Table (7) is that Table (8) adds "additional UL interference overload index", and this at least one additional UL interference overload index is a 10-bit bitmap. As an example to achieve. Each UL subframe in the physical resource block is presented at each location in the bit map. When the value of a certain position in the bit map is "1", it indicates that the degree of interference of the UL subframe is represented by "additional UL interference overload information". When the value of a position in the bit map is "0", then the table The degree of interference indicating that this UL subframe is represented by "UL interference overload information". Differentiate between different interference situations. It does not rule out that the "0" and "1" of this bit map are reversed. In this embodiment, the maximum number of the UL subframe is 6, and other numbers are not excluded.

In summary, the interference management method, the anchor device, the base station and the system thereof provided by the disclosure can make the base stations with mutual interference in the same UL-DL configuration group by using the load information transmitted between the base stations. The interference is managed by selecting UL-DL configurations that have a low interference relationship with each other. In addition, the base station can clearly know the interference situation of the physical resource blocks in each UL and DL subframe by using the interference overload indication in the load information, so that the base station can dynamically transmit the data to the resource region with low interference. Block to transfer. The base station can also learn the interference situation between the base stations by the high interference information in the load information. Based on the above, various embodiments of the present disclosure manage interference by load information transmitted between base stations.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

S210~S240‧‧‧Steps

Claims (27)

An interference management method for a wireless communication system, wherein the wireless communication system includes a plurality of base stations, and the interference management method includes: receiving corresponding at least one base station information from the base stations, wherein the base stations use at least one Uplink-downlink (UL-DL) configuration to communicate with corresponding user equipment; searching for an interference relationship between the base stations based on the base station information, and baseting the bases according to the interference relationship The station is divided into at least one cluster, wherein each cluster has at least one base station; determining at least one specific UL-DL configuration group corresponding to the at least one cluster, wherein the specific UL-DL configuration group includes at least one UL-DL configuration; Notifying the at least one base station in the at least one cluster such that the at least one base station adjusts the UL-DL configuration of the at least one base station according to the specific UL-DL configuration group. The interference management method according to claim 1, wherein the base station in the same cluster has an interference situation. The interference management method according to claim 1, wherein the base station information corresponding to each base station includes a load information, and further includes at least one of a base station configuration, a base station startup situation, and a resource status report. One. The interference management method according to claim 3, wherein the UL-DL configuration is a plurality of subframes in a single frame as an allocation unit, and the subframes are divided into a plurality of subframe groups, each subframe group Including at least one subframe, and, The load information includes: a plurality of overload information corresponding to the subframes or the group of subframes, wherein the overload information is used to determine a UL-DL configuration of each base station in the at least one cluster. The interference management method of claim 4, wherein the load information further comprises: at least one additional interference overload index, the additional interference overload index having a plurality of positions respectively corresponding to the respective subframes for indicating each overload information The corresponding sub-detection group. The interference management method of claim 3, wherein the load information further comprises: at least one high-interference information, each of the high-interference information respectively corresponding to a physical resource area in a target base station and at least one subframe And a block, wherein when the high interference information is a specific content, the at least one base station that sends the UL height interference information has been interfered. The interference management method of claim 1, wherein the base station information includes a UL-DL configuration corresponding to each base station, and notifying the at least one base station in the at least one cluster further includes the following steps: When the original UL-DL configuration of the at least one base station is already the specific UL-DL configuration, the at least one base station is not notified. The interference management method according to claim 1, wherein the base stations have seven preset UL-DL configurations, and at least one of the specific UL-DL configurations The group includes a subset of the preset UL-DL configurations, and each base station in the at least one cluster selects one of the UL-DL configurations from the specific UL-DL configuration group to set the UL of the at least one base station -DL configuration. A wireless communication system includes: an anchor device; and a plurality of base stations communicating with the anchor device, wherein the anchor device receives corresponding at least one base station information from the base stations, wherein the base stations Using at least one uplink-downlink (UL-DL) configuration to communicate with a corresponding user equipment, the anchor device searches for an interference relationship between the base stations based on the base station information, and according to The interference relationship is divided into at least one cluster having at least one base station, and at least one specific UL-DL configuration group corresponding to the at least one cluster is determined, wherein the specific UL-DL configuration group includes at least one UL-DL And configuring, and the anchor device notifies the at least one base station in the at least one cluster, so that the at least one base station adjusts the UL-DL configuration of the at least one base station according to the specific UL-DL configuration group. The wireless communication system of claim 9, wherein the anchor device is a stand-alone station or one of the base stations. An anchor device is applicable to a wireless communication system having a plurality of base stations, the anchor device comprising: a transceiver, receiving corresponding at least one base station information from the base stations, wherein the base stations use at least An uplink-downlink (UL-DL) configuration to communicate with corresponding user equipment; a processor coupled to the transceiver, the processor searching for an interference relationship between the base stations according to the base station information, and dividing the base stations into at least one base station according to the interference relationship Determining, by the at least one cluster, at least one specific UL-DL configuration group corresponding to the at least one cluster, wherein the specific UL-DL configuration group includes at least one UL-DL configuration, and the processor notifies the at least one cluster through the transceiver The at least one base station in the base station, so that the at least one base station adjusts the UL-DL configuration of the at least one base station according to the specific UL-DL configuration group. The anchor device of claim 11, wherein the anchor device is a stand-alone platform or one of the base stations. A wireless communication system includes: a first base station and a second base station, wherein the first base station transmits a message to the second base station, wherein the information includes a plurality of overload information, and the overload information respectively corresponds to the plurality of sub-networks a frame or a plurality of subframe groups, wherein the subframe group includes at least one subframe, and the overload information is used to indicate a degree of interference corresponding to each physical resource block in each subframe of the first base station. The wireless communication system of claim 13, wherein the information comprises a plurality of high-interference information corresponding to the plurality of subframes or the plurality of subframe groups. The wireless communication system of claim 14, wherein the overload information further comprises: a time indication, wherein the time indication is to issue the UL interference overload information The time information of the first base station. The wireless communication system of claim 14, wherein the overload information further comprises: a time offset indication, wherein the time indication is the second base station receiving the UL interference overload information and issuing the The time reference value between the first base stations of the overload information. The wireless communication system of claim 13, wherein the overload information comprises: a plurality of interference overload indications to present interference conditions of all or part of the UL subframe and the DL subframe. The wireless communication system of claim 17, wherein the overload information further comprises a time indication. The wireless communication system of claim 13, wherein the load information further comprises: at least one additional interference overload index, the additional interference overload index having a plurality of positions respectively corresponding to the respective subframes for indicating each overload information The corresponding sub-detection group. The wireless communication system of claim 13, wherein the second base station confirms interference in its UL-DL configuration according to the overload information, or the second base station according to the overload information Adjust your own UL-DL configuration. The wireless communication system of claim 13, wherein the information further comprises: At least one high-interference information, each of the high-interference information corresponding to a physical resource block in a target base station and at least one subframe, wherein when the high-interference information is a specific content, indicating that the high-interference is generated The first base station of information has been interfered by the second base station. The wireless communication system of claim 20, wherein the specific content of the high-interference information is that all values in the high-interference information are 0, all are 1, a specific number of values is 1 and others are 0, The specific number of values is 0, the other is 1, the values are 1 and 0 or 0 and 1 are mutually spaced; the information is a load information in an X2 application protocol (X2AP); when the high interference information is the For specific content, the information further includes an indication information to indicate to the second base station that the first base station is interfered by the second base station, and indicates an entity resource area in a subframe interfered by the second base station. Piece. A base station is applicable to a wireless communication system having the base station and another base station, the base station comprising: a transceiver directly or indirectly transmitting corresponding at least one base station information to the other base station; a processor coupled to the transceiver, the processor transmitting a message to the another base station through the transceiver, wherein the information includes a plurality of overload information, and the overload information respectively corresponds to multiple subframes or multiple subframes a group, wherein the subframe group includes at least one subframe, and the overload information is used to indicate a degree of interference corresponding to each physical resource block in each subframe of the first base station. A wireless communication system comprising: a first base station and a second base station, wherein the first base station directly or indirectly transmits a message to the second base station, wherein the information includes at least one high-level interference information, and each of the high-level interference information respectively corresponds to a target a physical resource block in the base station and the at least one subframe, wherein when the high-interference information is a specific content, the first base station that sends the high-interference information has been interfered by the second base station . The wireless communication system of claim 24, wherein the specific content of the high-interference information is that all values in the high-interference information are 0, all are 1, a specific number of values is 1, and the others are 0. The specific number of values is 0, the other is 1, the values are 1 and 0 or 0 and 1 are mutually spaced; the information is a load information in an X2 application protocol; when the high interference information is the specific content The information further includes an indication information to indicate to the second base station that the first base station is interfered by the second base station, and indicates a physical resource block in a subframe that is interfered by the second base station. The wireless communication system of claim 24, wherein the information further comprises: a plurality of overload information, wherein the overload information respectively corresponds to a plurality of subframes or a plurality of subframe groups, wherein the subframe group includes at least one subframe The overload information is used to indicate the degree of interference corresponding to each physical resource block in each subframe of the first base station. A base station is suitable for a wireless communication system having the base station and another base station, the base station comprising: a transceiver directly or indirectly transmitting the corresponding at least one base station information to the other base station; and a processor coupled to the transceiver, the processor transmitting a message to the another base through the transceiver And the information includes at least one high-interference information, where each of the high-interference information corresponds to a physical resource block in a target base station and at least one subframe, wherein when the high-interference information is a specific content, The first base station indicating that the high interference information is sent has been interfered by the second base station.