WO2014134985A1 - 干扰协调方法、系统及一种网络节点 - Google Patents

干扰协调方法、系统及一种网络节点 Download PDF

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Publication number
WO2014134985A1
WO2014134985A1 PCT/CN2014/071186 CN2014071186W WO2014134985A1 WO 2014134985 A1 WO2014134985 A1 WO 2014134985A1 CN 2014071186 W CN2014071186 W CN 2014071186W WO 2014134985 A1 WO2014134985 A1 WO 2014134985A1
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cell
network node
common set
minimum common
tdd
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PCT/CN2014/071186
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English (en)
French (fr)
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赵亚利
许芳丽
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电信科学技术研究院
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Publication of WO2014134985A1 publication Critical patent/WO2014134985A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a interference coordination method, a system, and a network node.
  • the Time Division Duplex (TDD) mode has received more and more attention in the context of the increasing bandwidth demand for broadband mobile communications.
  • the uplink and downlink transmissions use the same frequency resource, and the uplink/downlink data transmission is performed by time division multiplexing.
  • the uplink and downlink partitions are static or semi-static. The usual method is to determine the uplink-downlink ratio according to the cell type and the approximate service ratio in the network planning process.
  • the LTE TDD system has a radio frame length of 10 ms and contains 10 subframes, which are special subframes and regular subframes, each of which is lms.
  • the special subframe is divided into three time slots: a Downlink Pilot Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Slot (UpPTS).
  • the regular subframe is further divided into an uplink subframe and a downlink subframe, which are respectively used for transmitting uplink/downlink control signaling and service data.
  • the LTE TDD system defines a total of seven TDD UL/DL configurations as shown in Table 1 below.
  • the common features of the seven TDD UL/DL configurations are as follows: In a radio frame, two special subframes (subframes #1 and #6) can be configured, or only one special subframe (subframe #1) can be configured; Subframe #0 and subframe #5 and DwPTS slots in special subframes are always used for downlink transmission; subframe #2 and UpPTS slots in special subframes are always used for uplink transmission; other subframes can be used for It is configured to be used for uplink transmission or downlink transmission as needed.
  • the TDD UL/DL configuration mode of LTE R8 is static or semi-static, and cannot be flexibly adjusted according to service characteristics.
  • TDD UL/DL configuration is not conducive to improving system resource utilization and better guaranteeing the quality of service (QoS) of service transmission.
  • LTE TDD UL/DL Interference Management and LTE TDD for DL-UL Interference Management and Traffic Adaptation (LTE Rll elMTA) project introduces a dynamic TDD UL/DL configuration change mechanism, which will be TDD UL.
  • the /DL configuration change frequency is shortened from a thousand days to a thousand milliseconds (ms).
  • ms milliseconds
  • the system message update method or the notification method similar to the Earthquake and Tsunami Warning System (ETWS) can be used, and the TDD UL/DL configuration change period allowed for the system message update mode is 640 ms, for ETWS-like.
  • the TDD UL/DL configuration change period allowed by the notification method is
  • radio resource control Radio Resource Control, RRC M command, medium access control (MAC) signaling, or physical downlink control channel (PDCCH) signaling.
  • RRC M command Radio Resource Control
  • MAC medium access control
  • PDCCH physical downlink control channel
  • the /DL configuration change period is about 200ms;
  • the TDD UL/DL configuration change period allowed in the MAC signaling mode is about several tens of ms;
  • the TDD UL/DL configuration change period allowed in the PDCCH signaling mode is about 10 ms.
  • 3GPP introduces a layered networking solution to solve this problem:
  • a small coverage environment such as a hotspot area, a home indoor environment, and an office environment
  • the cells under these low-power base stations can be called a Small CelL Macro Cell and a Small Cell.
  • the network can be called a heterogeneous network.
  • Small Cell allows heterogeneous network to use dynamic TDD UL/DL configuration, but in order to avoid cross-interference between Small cells, one solution is to form Small Cell into thousands of Cell Clusters. Different TDD UL/DL configurations are allowed between different Cell Clusters using the same TDD UL/DL configuration.
  • the interference coordination mechanism is called Cell Clustering Interference Mitigation (CCIM), as shown in Figure 2.
  • CCIM Cell Clustering Interference Mitigation
  • the Cell Cluster may also have a cell that manages the Cell Cluster, which may be called a cluster head of the Cell Cluster.
  • the existing CCIM mechanism can avoid uplink/downlink crosstalk between Small cells, but in a heterogeneous network, if the Macro Cell and the Small Cell are in the same frequency or in adjacent bands, then if both are allowed The transmission will likely result in uplink/downlink crosstalk between the Macro and Small Cell and between the Macro UE and the Small Cell UE.
  • the embodiment of the present invention provides a method and system for coordinating interference, and a network node, which is used to prevent a Macro Cell and a Small Cell from being transmitted at the same frequency or in an adjacent band under a heterogeneous network. Up/down crosstalk between Macro and Small Cell and between Macro UE and Small Cell UE.
  • a minimum common set of time-division duplex TDD uplink and downlink UL/DL configurations, a restricted cell, and a non-restricted cell Determining, by the first network node, a minimum common set of time-division duplex TDD uplink and downlink UL/DL configurations, a restricted cell, and a non-restricted cell, and notifying related information of the minimum common set to the restricted cell controlled by the second network node And a non-restricted cell controlled by the third network node; wherein, a transmission direction of the subframe in the minimum common set remains unchanged, and the restricted cell only allows to use the subframe in the minimum common set for data transmission The non-restricted cell allows all subframes to be used for data transmission;
  • the restricted cell is allowed to use only the subframes in the minimum common set for data transmission;
  • the third network node receives and controls the non-restricted cell to allow data transmission using all subframes according to the related information of the smallest common set notified by the first network node.
  • a first network node configured to determine a minimum common set, a restricted cell, and a non-restricted cell of the time-division duplex TDD uplink and downlink UL/DL configuration, and notify related information of the minimum common set to the second network node to control a restricted cell and a non-restricted cell controlled by the third network node; wherein, a transmission direction of the subframe in the minimum common set remains unchanged, and the restricted cell only allows to use a subframe in the minimum common set Performing data transmission, the unrestricted cell Allows all sub-frames to be used for data transmission;
  • a second network node configured to receive and according to related information of a minimum common set notified by the first network node, to control that the restricted cell only allows to use the subframes in the minimum common set for data transmission;
  • a third network node configured to receive and according to related information of the smallest common set notified by the first network node, to control the unconstrained cell to allow all subframes to use for data transmission.
  • a determining unit configured to determine a minimum common set, a restricted cell, and a non-restricted cell of the time-division duplex TDD uplink and downlink UL/DL configuration; wherein, a transmission direction of the subframe in the minimum common set remains unchanged,
  • the restricted cell only allows data transmission using subframes within the minimum common set, and the unrestricted cell allows data transmission using all subframes;
  • a notification unit configured to notify related information of the minimum common set to the restricted cell and the unrestricted cell.
  • the subframe transmission direction in the most common set of the TDD UL/DL configuration is not allowed to change, and the subframe transmission direction outside the minimum common set may be Make dynamic adjustments. This avoids uplink/downlink crosstalk between cells that use only the smallest common set of TDD UL/DL configurations and cells that use dynamic TDD UL/DL configurations.
  • FIG. 1 is a schematic structural diagram of an existing LTE TDD system
  • FIG. 2 is a schematic diagram of an existing heterogeneous network scenario
  • FIG. 3 is a schematic flowchart of a method for coordinating interference according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a interference coordination system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a network node according to an embodiment of the present invention.
  • the embodiment of the present invention provides a method and system for coordinating interference, and a network node, which is used to prevent a Macro cell and a Small Cell from being transmitted at the same frequency or in an adjacent band under a heterogeneous network. Up/down crosstalk between Macro and Small Cell and between Macro UE and Small Cell UE.
  • the common set of the TDD UL/DL configuration is not allowed to change, and the subframe transmission direction outside the set can be dynamically Adjustment. This avoids uplink/downlink crosstalk between cells using only the smallest common set of TDD UL/DL configurations and cells using dynamic TDD UL/DL configurations.
  • a method for coordinating interference interference includes:
  • the first network node determines a minimum common set of time-division duplex TDD uplink and downlink UL/DL configurations, a restricted cell, and a non-restricted cell, and notifies the related information of the minimum common set to the restricted cell controlled by the second network node.
  • the unrestricted cell controlled by the three network nodes wherein the transmission direction of the subframe in the smallest common set remains unchanged, the restricted cell only allows the data transmission in the subframe in the smallest common set, and the unrestricted cell allows the use of all Subframe for data transmission;
  • the minimum common set of TDD UL/DL configurations includes multiple subframes, so that all cells in a group of cells (the number of cells > 1) must ensure that the subframe transmission direction in the smallest common set does not change.
  • the minimum common set of the TDD UL/DL configuration may be determined by the Operation Administration and Maintenance (OAM) node configuration or the central management node, or may be determined by each cell in the cell group.
  • OAM Operation Administration and Maintenance
  • a partial cell in a cell group is allowed to use only subframes in a minimum common set of TDD UL/DL configurations (these cells are called restricted cells, and if the restricted cells are further divided into thousands of clusters, then it is called restricted).
  • the cell clusters, and other cells in the cell group can use all the subframes (these cells are called unrestricted cells, and the unrestricted cells can also be divided into thousands of clusters, which can be called unrestricted cell clusters).
  • the second network node receives the minimum common set notified by the first network node, and controls the restricted cell to allow only data transmission using the subframes in the minimum common set.
  • the third network node receives the smallest common set notified by the first network node, and controls the unrestricted cell to allow all subframes to use for data transmission.
  • the related information of the smallest common set is one of the following:
  • the first network node determines a minimum common set of uplink and downlink UL/DL configurations of the time division duplex TDD, including: the first network node receives the cluster head report reported by each cell in the cell group or belongs to each cell in the cell group. Up/down traffic volume ratio information or uplink and downlink resource utilization information;
  • the first network node determines a minimum common set of TDD UL/DL configurations according to the uplink and downlink traffic ratio information or the uplink and downlink resource utilization information.
  • the method further includes:
  • the first network node receives capability information of whether the dynamic TDD UL/DL configuration is supported by each cell in the cell group; or, each cell in the cell group reports the capability information of the dynamic TDD UL/DL configuration to the cluster head to which it belongs. Then, the first network node receives, from each cluster head, capability information of whether each cell in the cluster supports dynamic TDD UL/DL configuration.
  • each cell in the cell group needs to indicate whether the dynamic TDD UL/DL configuration is supported to the OAM or the central management node.
  • each cell in the cell group reports to the cluster head to which it supports dynamic TDD UL/
  • the capability information of the DL configuration is then received by the first network node from each cluster head to indicate whether the cells in the cluster need to enable the indication of the dynamic TDD UL/DL configuration.
  • the method further includes:
  • Each cell in the cell group reports to the first network node whether the indication information of the dynamic TDD UL/DL configuration needs to be enabled; or each cell in the cell group reports to the cluster head to which the dynamic TDD UL/DL configuration needs to be enabled. Then, the cluster head in the cell cluster reports to the first network node whether the cells in the cluster need to enable the indication of the dynamic TDD UL/DL configuration.
  • the first network node acquires whether the cells in the cell group need to be dynamically started from one or more cells in the cell group. Instructions for TDD UL/DL configuration.
  • each cell or group of cells in the cell group can report to the OAM or the central management node whether the dynamic TDD UL/DL configuration needs to be turned on or whether each cell in the cell group reports to the cluster head to which it belongs.
  • the capability information of the TDD UL/DL configuration is then reported by each cluster head to the OAM or the central management node to report whether the cells in the cluster need to enable the dynamic TDD UL/DL configuration.
  • the method further includes:
  • the second network node controls the restricted cell to notify the UE of the restricted cell service of the related information of the minimum common set, so that the UE maintains data transmission and reception on the subframe in the smallest common set, and does not perform data transmission and reception on other subframes.
  • the second network node controlling the restricted cell to notify the UE of the restricted cell service that the related information of the minimum common set includes:
  • the second network node controls the restricted cell to notify the UE served by the restricted cell of the information about the smallest common set by broadcast or dedicated signaling.
  • the second network node controls the restricted cell to notify the UE of the restricted cell service of the information about the smallest common set by using a bitmap or a dedicated signaling.
  • the restricted cell needs to notify the UE of the restricted cell service of the minimum common set of the TDD UL/DL configuration, and the UE maintains data transmission and reception on the subframe in the smallest common set of the TDD UL/DL configuration, and the other subframes are not performed.
  • the specific notification mode may use broadcast or dedicated signaling (RRC/MAC/PDCCH), and the content of the notification may be a corresponding subframe in the minimum common configuration set, and may be notified by using a bitmap method.
  • the method further includes:
  • the second network node controls the restricted cell to configure the UE's Physical Uplink Control Channel (PUCCH) resource or Sounding Reference Signal (SRS) resource within a subframe included in the smallest common set.
  • PUCCH Physical Uplink Control Channel
  • SRS Sounding Reference Signal
  • the restricted cell needs to allocate resources such as the PUCCH resource/sounding reference signal (SRS) of the UE in the subframe included in the minimum common set, and the configuration of the minimum common set needs to be guaranteed.
  • the restricted cell can receive broadcasts and pages.
  • the smallest common set contains subframes for broadcast and page transmission. That is, when the first network node configures the minimum common set, it is ensured that the UE in the restricted cell can receive broadcast and paging, that is, the subframe used for broadcasting and paging needs Included in the smallest public collection.
  • the first network node is an Operation Maintenance Management (OAM) node or a central management node.
  • OAM Operation Maintenance Management
  • the central management node is a macro e base.
  • the third network node controls the unconstrained cell to use all the subframes according to the related information of the smallest common set notified by the first network node.
  • Data transfer includes:
  • the third network node selects the TDD UL/DL configuration according to the subframe included in the minimum common set, and controls the unconstrained cell to perform data transmission according to the selected TDD UL/DL configuration.
  • each cell or cell cluster in the cell group needs to be notified, and the OAM and the central management node may further determine the cell.
  • TDD UL/DL configuration used by unrestricted cells or clusters within a group If the TDD UL/DL configuration is notified, it should be noted that the TDD UL/DL configuration used by the unrestricted cell or the cell cluster ensures that the transmission direction of each subframe in the minimum common configuration set does not change, and other subframes can be flexible. Select the uplink and downlink transmission direction.
  • the OAM or the central management node determines the minimum common set of TDD UL/DL configurations, and may require each cell or cell cluster in the cell group to provide some auxiliary information, such as the ratio of uplink/downlink traffic of each cell or each cell cluster in the cell group. Information or uplink/downstream resource utilization information, etc.
  • the Macro eNB and the Small Cell in its coverage form a cell group, and the Small Cell can be further divided into thousands of Small Cell clusters.
  • Step 1 Determine the central management node and the restricted and unrestricted cells
  • the Macro eNB Since the Macro eNB provides a wide range of coverage, the Macro eNB can be selected as the central management node. Considering the interference situation, the Macro eNB may interfere with any cell in its coverage, so you can choose
  • the cell under the Macro eNB acts as a restricted cell, and the other Small Cell acts as an unrestricted cell.
  • the Macro eNB can learn whether the Macro cell supports the capability information of the dynamic TDD configuration and whether the indication of the dynamic TDD configuration needs to be enabled. Therefore, only the interaction between the Macro eNB and the Small Cell (or Small Cell Cluster) is introduced in the embodiment. .
  • Step 2 The central management node obtains the capability information of the dynamically managed TDD UL/DL configuration for the cell it manages.
  • the Macro eNB obtains capability information of whether each small cell supports dynamic TDD UL/DL configuration through an inter-base station interface (such as an X2 interface or the like).
  • the message can be established in the X2 interface (X2 setup) or the eNB eNB configuration update.
  • Step 3 The central management node evaluates whether a minimum common set of TDD UL/DL configurations needs to be enabled.
  • Macro e B determines that the TDD UL/DL configuration minimum public set can be enabled:
  • Small Cell (or Small Cell Cluster) supports dynamic TDD UL/DL configuration within Macro eNB coverage.
  • Some or all Small Cell (or Small Cell Cluster) under the Macro eNB indicates to the Macro eNB that the dynamic TDD UL/DL configuration needs to be enabled.
  • the Macro eNB determines that some or all of the Small CelK or Small Cell Clusters within its coverage need to be enabled for dynamic TDD UL/DL configuration based on the auxiliary information provided by the Small Cell (or Small Cell Cluster).
  • the auxiliary information provided by the Small Cell (or Small Cell Cluster) may be the uplink and downlink traffic information of the Small Cell (or Small Cell Cluster) or the uplink/downlink traffic comparison information or the uplink/downlink resource utilization information, such as the uplink/downlink physical resource block.
  • UL/DL Physical Resource Block usage (UL/DL PRB usage).
  • Step 4 The central management node determines the smallest common set of TDD UL/DL configurations.
  • the Macro eNB according to the data transmission requirements of the Macro UE, the auxiliary information provided by each Small Cell (or Small Cell Cluster) in the coverage of the Macro eNB, Hybrid-Relay (HQQ)/Scheduling timing, Macro under The UE receives a broadcast or paged subframe request, etc.
  • One or more factors determine a minimum common set of TDD UL/DL configurations. For example, according to the data transmission requirement of the Macro UE, the HARQ/Scheduling timing, and the broadcast receiving requirement of the Macro UE, the minimum common set can be determined as follows: First, according to the uplink and downlink data transmission requirements of the Macro UE, the required uplink/downlink is determined.
  • the system's HARQ/Scheduling timing can be.
  • Step 5 The central management node notifies the restricted cell/cell cluster and the unrestricted cell/cell cluster of the determined minimum common set of TDD UL/DL configurations.
  • the Macro eNB can use the bitmap mode when notifying the Smallest Common Set of TDD UL/DL configurations to Small CelK or Small Cell Cluster) and Macro UE under Macro Cell.
  • the smallest common set of TDD UL/DL configurations is subframe ⁇ 0, 1, 2, 5 ⁇ .
  • bitmap can be expressed as ⁇ 1, 1, 1, 0, 0, 1, 0, 0, 0 ⁇ or ⁇ 0, 0, 0, 1, 1, 0, 1, 1, 1, 1 ⁇ .
  • the notification mode is different in that the Small Cell (or Small Cell Cluster) is notified through the inter-base station interface (X2 interface or the like), and the UE is notified. Then, it can be notified by means of broadcast or dedicated signaling (RRC, MAC or PDCCH). If RRC signaling is used, the RRC reconfiguration procedure can be used.
  • RRC dedicated signaling
  • Step 6 The unrestricted cell selects the TDD UL/DL configuration according to the smallest common set of TDD UL/DL configurations.
  • the Small Cell After receiving the minimum common set of the TDD UL/DL configuration, the Small Cell (or Small Cell Cluster) can determine the TDD UL/DL used by the Small Cell (or Small Cell Cluster) according to its uplink and downlink transmission requirements.
  • the configuration, the selected TDD UL/DL configuration can ensure that the transmission direction of the subframes in the smallest common set is the same as the transmission direction of the Macro e B, and the transmission direction of other subframes can be dynamically adjusted.
  • Step 7 The UE under the restricted cell performs uplink/downlink data transmission according to the minimum common set of TDD UL/DL configurations.
  • the Macro UE only allows uplink/downlink data transmission on subframes within the smallest common set of TDD UL/DL configurations, and uplink/downlink data transmission is not allowed on other subframes.
  • PDSCH Physical Downlink Control
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the PUCCH/Physical Uplink Shared Channel (PUSCH)/SRS/Packet Random Access Channel (PRACH) transmission is stopped.
  • PUSCH Physical Uplink Shared Channel
  • SRS Packet Random Access Channel
  • Step 8 The central management node performs the minimum common set adjustment of the TDD UL/DL configuration.
  • the Macro Cell can then adjust the minimum common set of the TDD UL/DL configuration according to its own load, the load of the Small Cell (or Small Cell Cluster), and the like. Once the minimum common set of the TDD UL/DL configuration is adjusted, the steps need to be repeated. Four, five, six, seven.
  • Embodiment 2 is the same as Embodiment 1, and the main difference is that the central management node of Embodiment 1 notifies the restricted cell and the unrestricted cell that the restricted cell notifies the UE that it is serving is the TDD UL/DL configuration.
  • the minimum common set, while Embodiment 2 informs the set of subframes outside the smallest common set of TDD UL/DL configurations.
  • Embodiment 2 Except for steps 5, 6, and 7, the other steps are the same as those of Embodiment 1, and only different steps are introduced here:
  • Step 5 differs from Embodiment 1 in that:
  • the Macro eNB notified to the Small Cell (or Small Cell Cluster) and the UE in step 5 in Embodiment 1 is the smallest common set of TDD UL/DL configurations, and the minimum common set of TDD UL/DL configurations is notified in Embodiment 2.
  • Other sub-frames that is, assuming that the smallest common set of TDD UL/DL configurations determined by the Macro eNB is a subframe ⁇ 0, 1 , 2 , 5 ⁇ , then the set of notifications here is ⁇ 3 , 4 , 6 , 7 . 8 , 9 ⁇ .
  • Step 6 differs from Embodiment 1 in that:
  • the Small Cell (or Small Cell Cluster) performs dynamic TDD UL/DL configuration change
  • only the Macro eNB is allowed to change the uplink/downlink transmission direction of the subframes in the set indicated in step 5.
  • Step 7 differs from Embodiment 1 in that:
  • the Macro UE does not allow uplink/downlink data transmission within the set indicated by the Macro eNB.
  • the method includes: stopping receiving, for example, a PDCCH/PDSCH/CRS/CSI-RS for a downlink subframe;
  • transmission such as PUCCH/PUSCH/SRS/PRACH is stopped.
  • Example 3 The embodiment of the embodiment 3 is the same as the embodiment 1.
  • the main difference between the embodiment 3 and the embodiment 1 is that the central management node notifies the unrestricted cell/cell cluster that the TDD UL is specifically used by the cell/cell cluster. /DL configuration.
  • the difference between this embodiment 3 and the embodiment 1 lies mainly in steps 5 and 6, and the other steps are identical.
  • the Macro eNB indicates to the Small Cell (or Small Cell Cluster) that it is the smallest common set of TDD UL/DL configurations, and here the Macro eNB indicates to the Small Cell (or Small Cell Cluster) that is the Small Cell (or Small Cell ( Or Small Cell Cluster) TDD UL/DL configuration that can be used specifically.
  • the sixth step in the embodiment 1 can be omitted.
  • Embodiment 4 The supporting condition of Embodiment 4 is the same as that of Embodiment 1, and the main difference between Embodiment 4 and Embodiment 2 is that: the restricted cell notifies the serving UE that is a subframe other than the smallest common set of TDD UL/DL configurations, And indicating to the unrestricted cell/cell cluster is its specifically used TDD UL/DL configuration.
  • the difference between this embodiment 4 and embodiment 2 is mainly in steps 5 and 6, and the other steps are identical.
  • the Macro eNB indicates to the Small CelK or the Small Cell Cluster that the subframe set is outside the minimum common set of the TDD UL/DL configuration
  • the Macro eNB indicates to the Small CelK or the Small Cell Cluster.
  • the TDD UL/DL configuration that can be used by Small Cell (or Small Cell Cluster).
  • the sixth step in the second embodiment can be omitted.
  • Embodiment 5 The conditions of Embodiment 5 are the same as those of Embodiment 1, and unlike Embodiment 1, the minimum common set of TDD UL/DL configurations is determined by OAM in Embodiment 5.
  • Step 1 The OAM obtains the capability support information of the TDD UL/DL configuration of each cell in the cell group.
  • Each cell in the cell group composed of the Macro and the Small Cell reports to the OAM whether it supports the capability information of the dynamic TDD UL/DL configuration.
  • Step 2 OAM evaluates whether a minimum common set of TDD UL/DL configurations needs to be enabled.
  • OAM determines the smallest common set of TDD UL/DL configurations that can be enabled as long as one or more of the following conditions are met:
  • Some or all of the cell clusters in the cell group indicate to the OAM that the dynamic TDD UL/DL configuration needs to be enabled.
  • the OAM determines that some or all of the cells it manages need to enable dynamic TDD UL/DL configuration according to the auxiliary information provided by the cell or the cell cluster.
  • the auxiliary information provided by the cell or the cell cluster to the OAM may be the uplink or downlink traffic information of the cell or the cell cluster or the uplink/downlink traffic comparison information or the uplink/downlink resource utilization information (such as UL/DL PRB usage).
  • Step 3 The OAM determines the restricted cell/cell cluster and the unrestricted cell/cell cluster.
  • the restricted cell/cell cluster and the unrestricted cell/cell cluster may be determined according to the interference condition OAM. For example, the cell under Macro e B is divided into a restricted cell/cell cluster, and the Small Cell/Small Cell is divided into unrestricted cells/cell clusters.
  • Step 4 OAM determines the smallest common set of TDD UL/DL configurations.
  • the OAM determines the minimum common set of TDD UL/DL configurations according to one or more factors such as data transmission requirements in the cell cluster, auxiliary information provided by each cell, HARQ/Scheduling timing, sub-frame requirements of the UE receiving broadcast or paging under Macro. .
  • the minimum common set can be determined as follows: Firstly, according to the uplink and downlink data transmission requirements of the Macro UE, the required uplink/downlink is determined.
  • the number of subframes, and then determining the downlink subframes (subframe #0 and subframe #5) that must be included according to the broadcast reception requirement, and then selecting other uplink/downlink subframes as long as it can satisfy the selected UL/DL subframe conforming to TDD The system's HARQ/Scheduling timing can be.
  • Step 5 OAM notifies Small CelK or Small Cell Cluster and Macro celL of the smallest common set of TDD UL/DL configurations it determines.
  • OAM notifies Small Cell (or Small Cell Cluster) and Macro CelL of the smallest common set of TDD UL/DL configurations
  • the eNB can use the bitmap mode when notifying the Macro UE of the minimum common set of TDD UL/DL configurations.
  • the smallest common set of TDD UL/DL configurations is subframe ⁇ 0, 1, 2, 5 ⁇ .
  • bitmap can be expressed as
  • the Macro eNB When the Macro eNB notifies the Macro UE, it can use the broadcast or dedicated signaling (RRC, MAC or PDCCH) to notify. If RRC signaling is used, the RRC reconfiguration procedure can be used.
  • RRC dedicated signaling
  • Step 6 Small Cell (or Small Cell Cluster) is selected according to the minimum common set of TDD UL/DL configurations.
  • the small cell cluster may determine the TDD UL/DL configuration used by the Small CelK or the Small Cell Cluster according to its uplink and downlink transmission requirements, and the selected TDD UL/DL configuration may be It is ensured that the transmission direction of the subframe in the smallest common set is the same as the transmission direction of the Macro eNB, and the transmission direction of other subframes can be dynamically adjusted.
  • Step 7 The Macro UE performs uplink/downlink data transmission according to the minimum common set of TDD UL/DL configurations.
  • the MacroUE only allows uplink/downlink data transmission on subframes within the smallest common set of TDD UL/DL configurations, and uplink/downlink data transmission is not allowed on other subframes.
  • configurations such as PUCCH/SRS of MacroUE also need to be configured on subframes within the smallest common set.
  • Step 8 OAM performs the minimum common set adjustment for TDD UL/DL configuration.
  • the OAM can subsequently adjust the minimum TDD UL/DL configuration according to the auxiliary information reported by each cell in the cell cluster.
  • Common set once the minimum common set of the TDD UL/DL configuration is adjusted, then steps 4, 5 need to be repeated.
  • the cell/cell cluster may also be a subframe set other than the TDD UL/DL configuration set, and the OAM notification to the unrestricted cell/cell cluster may also be its TDD UL/DL configuration, and the flow is similar to that of Embodiment 5, where No longer - enumeration.
  • Step 1 The central management node obtains the capability information of the dynamic TDD UL/DL configuration for each cell managed by the central management node, and the primary cell in the Small Cell Cluster can serve as the central management node.
  • the primary cell may determine which cells in the Small Cell Cluster support dynamic TDD UL/DL configuration according to the dynamic TDD UL/DL configuration capability support information carried in the interaction information (such as X2 setup or eNB configuration update) when the inter-cell interface is established or updated. .
  • Step 2 The central management node determines the restricted cell and the unrestricted cell.
  • the primary cell (cluster head) in the Small Cell Cluster can use the cell supporting the dynamic TDD UL/DL configuration in the Small Cell Cluster as the unrestricted cell, and the other cells as the restricted cell.
  • Step 3 The central management node evaluates whether a minimum common set of TDD UL/DL configurations needs to be enabled.
  • the primary cell determines the smallest common set that can enable TDD UL/DL configuration as long as one or more of the following conditions are met:
  • Small Cell supports Small Dynamic Cell TDD UL/DL configuration.
  • Some or all cells in the Small Cell Cluster indicate to the primary cell that dynamic TDD UL/DL configuration needs to be enabled.
  • the primary cell in the Small Cell Cluster determines that some or all of the cells it manages need to enable dynamic TDD UL/DL configuration according to the auxiliary information provided by each cell in the cell.
  • the auxiliary information provided by the cell may be downlink traffic information or uplink/downlink traffic comparison information or uplink/downlink resource utilization information (such as UL/DL PRB usage) on the cell or the cell cluster.
  • Step 4 The central management node determines the smallest common set of TDD UL/DL configurations.
  • the primary cell in the small cell cluster is determined according to one or more factors such as data transmission requirements of each cell in the Small Cell Cluster, auxiliary information provided by each cell, HARQ/Scheduling timing, and a sub-frame request of the UE to receive broadcast or paging under Macro.
  • the smallest common set of TDD UL/DL configurations For example, according to the data transmission requirement of the Macro UE, the HARQ/Scheduling timing, and the broadcast receiving requirement of the Macro UE, the minimum common set can be determined as follows: First, according to the uplink and downlink data transmission requirements of the Macro UE, the required uplink/downlink is determined.
  • the selection of the uplink/downlink subframes can be performed as long as the selected UL/DL subframes meet the HARQ/Scheduling timing of the TDD system.
  • Step 5 The central management node notifies the restricted cell and the unrestricted cell primary cell that the minimum common set of TDD UL/DL configurations is determined to pass the smallest common set of TDD UL/DL configurations through the inter-cell interface (such as an X2 interface or the like).
  • the interface notifies the restricted cell and the unrestricted cell within the Small Cell Cluster.
  • the restricted cell After receiving the minimum common set of the TDD UL/DL configuration, the restricted cell also needs to notify the UE it serves by broadcast or dedicated signaling (RRC, MAC or PDCCH). If RRC signaling is used, the RRC reconfiguration procedure can be used.
  • RRC dedicated signaling
  • the notification can be in the bitmap mode.
  • the smallest common set of TDD UL/DL configurations is subframe ⁇ 0, 1, 2, 5 ⁇ .
  • bitmap can be expressed as ⁇ 1, 1, 1, 0, 0, 1, 0, 0, 0 ⁇ or ⁇ 0, 0, 0, 1, 1, 0, 1, 1, 1, 1 ⁇ .
  • the further primary cell may also directly determine the TDD UL/DL configuration of the unrestricted cell and notify the unrestricted cell through the inter-base station interface. In this case, optionally, the primary cell may no longer notify the least common set of unrestricted cell TDD UL/DL configurations.
  • Step 6 The behavior of the UE served by the restricted cell.
  • the UE of the restricted cell only allows uplink/downlink data transmission on the subframes within the smallest common set of TDD UL/DL configurations, and uplink/downlink data transmission is not allowed on other subframes.
  • the PUCCH/SRS configuration of the restricted cell also needs to be configured on the subframe within the smallest common set.
  • Step 7 The central management node performs the minimum common set adjustment of the TDD UL/DL configuration.
  • the primary cell may subsequently adjust the TDD according to the auxiliary information reported by each cell in the Small Cell Cluster.
  • steps 4, 5, and 6 need to be repeated.
  • a interference coordination system provided by an embodiment of the present invention includes:
  • the first network node 11 is configured to determine a minimum common set of the uplink and downlink UL/DL configurations of the time division duplex TDD, the restricted cell and the unrestricted cell, and notify related information controlled by the second network node to the information about the minimum common set.
  • a restricted cell and a non-restricted cell controlled by the third network node wherein, the transmission direction of the subframe in the smallest common set remains unchanged, and the restricted cell only allows the data transmission in the smallest common set of subframes, The restricted cell allows all subframes to be used for data transmission;
  • a second network node 12 configured to receive related information of a minimum common set notified by the first network node 11, and control the restricted cell to allow only data transmission using the subframes in the smallest common set;
  • the third network node 13 is configured to receive and according to related information of the smallest common set notified by the first network node, and control the unconstrained cell to allow all subframes to use for data transmission.
  • the first network node 11 receives the cells reported by the cells in the cell group or belong to the cells in the cell group.
  • the first network node 11 receives the capability information of the dynamic TDD UL/DL configuration reported by each cell in the cell group; or, each cell in the cell group reports whether it supports dynamic TDD UL/ to the cluster head to which it belongs.
  • the capability information of the DL configuration and then the first network node 11 receives, from each cluster head, capability information of whether each cell in the cluster supports dynamic TDD UL/DL configuration.
  • Each cell in the cell group reports to the first network node 11 whether the indication of the dynamic TDD UL/DL configuration needs to be enabled, or whether each cell in the cell group reports to the cluster head to which it belongs that the dynamic TDD UL/DL configuration needs to be enabled.
  • the information is then received by the first network node 11 from the respective cluster heads to indicate whether the respective cells in the cluster need to enable the indication of the dynamic TDD UL/DL configuration.
  • the second network node 12 controls the restricted cell to notify the UE of the restricted cell service of the related information of the minimum common set, so that the UE maintains data transmission and reception on the subframes in the smallest common set, and does not perform data transmission and reception on other subframes.
  • the second network node 12 controls the restricted cell to notify the UE of the restricted cell service that the related information of the minimum common set includes:
  • the second network node 12 controls the restricted cell to inform the UE of the restricted cell service of the information of the smallest common set by broadcast or dedicated signaling.
  • the second network node 12 controls the restricted cell to notify the UE of the restricted cell service by using the bit mapping bitmap mode to broadcast the related information of the minimum common set by means of broadcast or dedicated signaling.
  • the second network node 12 controls the restricted cell to configure the physical uplink control channel PUCCH resource or the sounding reference signal SRS resource of the UE in a subframe included in the smallest common set.
  • the smallest common set contains subframes for broadcast and page transmission.
  • the first network node 11 manages an OAM node or a central management node for operation and maintenance.
  • the central management node is a macro base station Macro e B.
  • the related information of the smallest common set is one of the following information:
  • a network node that is, the foregoing first network node, provided by the embodiment of the present invention includes: a determining unit, configured to determine a minimum common set, a restricted cell, and a non-received of the uplink/downlink UL/DL configuration of the time division duplex TDD a restricted cell; wherein, the transmission direction of the subframe in the smallest common set remains unchanged, the restricted cell only allows the data transmission using the subframes in the smallest common set, and the unrestricted cell allows all the subframes to use the data transmission; And a notification unit, configured to notify related information of the minimum common set to the restricted cell and the unrestricted cell.
  • the determining unit receives the uplink-downlink traffic ratio information or the uplink-downlink resource utilization information of the uplink of the cluster heads reported by the cells in the cell group or the cells in the cell group; Information or uplink and downlink resource utilization information, determining the smallest common set of TDD UL/DL configurations.
  • the network node further includes:
  • the capability information receiving unit is configured to receive capability information of the dynamic TDD UL/DL configuration reported by each cell in the cell group, or to receive dynamic TDD for each cell reported by the cluster head to which each cell in the cell group belongs Capability information for UL/DL configuration.
  • the network node further includes:
  • the indication information receiving unit is configured to receive, by the respective cells in the cell group, whether the indication information of the dynamic TDD UL/DL configuration needs to be turned on, or whether the cells that are reported by the cluster head to which the cells in the cell group belong are required to be dynamically started. Instructions for TDD UL/DL configuration.
  • the network node manages the OAM node or the central management node for operation and maintenance.
  • the central management node is a macro base station Macro e B.
  • the embodiment of the present invention further provides another network node, that is, the foregoing first network node, and the structure thereof is as shown in FIG. 5, and specifically includes a processor 51 and a memory 52, wherein the processor 51 is implemented according to a pre-configured computer program.
  • the memory 52 stores the code of the computer program. specific:
  • the processor 51 is configured to determine a minimum common set of the uplink and downlink UL/DL configurations of the time division duplex TDD, the restricted cell, and the unrestricted cell; wherein, the transmission direction of the subframe in the smallest common set remains unchanged, the restricted cell Only the subframes within the smallest common set are allowed to perform data transmission, and the unrestricted cell allows all subframes to be used for data transmission, and the related information of the smallest common set is notified to the restricted cell and the unrestricted cell.
  • the processor is configured to: receive uplink/download traffic ratio information or uplink and downlink resource utilization information reported by each cell in the cell group or the cluster head to which each cell in the cell group belongs; according to the uplink and downlink traffic volume ratio information Or the uplink and downlink resource utilization information to determine the minimum common set of TDD UL/DL configurations.
  • the processor is further configured to: receive the capability information of the dynamic TDD UL/DL configuration that is reported by each cell in the cell group; or, to receive, whether the cells that are reported by the cluster head to which the cells in the cell group belong are Capability information supporting dynamic TDD UL/DL configuration.
  • the transceiver interface is further configured to: receive, by the respective cell in the cell group, whether the indication information of the dynamic TDD UL/DL configuration needs to be turned on, or whether each cell reported by the cluster head to which each cell in the cell group belongs is received. Instructions for turning on dynamic TDD UL/DL configuration are required.
  • the network node manages the OAM node or the central management node for operation and maintenance.
  • the central management node is a macro base station Macro eNB.
  • the present invention provides a method and system for interference coordination in a dynamic TDD UL/DL configuration.
  • the subframe transmission direction within the minimum common set of TDD UL/DL configurations is not allowed to change, and the subframe transmission direction outside the set can be dynamically adjusted. This avoids uplink/downlink crosstalk between cells that use only the smallest common set of TDD UL/DL configurations and cells that use dynamic TDD UL/DL configurations.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention is in the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including an instruction system.
  • the system implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of a flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请公开了干扰协调方法、系统及一种网络节点,以避免上下行交叉干扰。该方法包括:第一网络节点确定TDD UL/DL配置的最小公共集合、受限小区和非受限小区,并将最小公共集合的相关信息通知给第二网络节点控制的受限小区和第三网络节点控制的非受限小区;其中,最小公共集合内的子帧的传输方向保持不变,受限小区仅允许使用最小公共集合内的子帧进行数据传输,非受限小区允许使用全部子帧进行数据传输;第二网络节点接收并根据第一网络节点通知的最小公共集合的相关信息,控制受限小区仅允许使用最小公共集合内的子帧进行数据传输;第三网络节点接收并根据第一网络节点通知的最小公共集合的相关信息,控制非受限小区允许用全部子帧进行数据传输。

Description

千扰协调方法、 系统及一种网络节点 本申请要求在 2013年 3月 5 日提交中国专利局、 申请号为 201310069061.9、 发明名 称为"千扰协调方法、 系统及一种网络节点"的中国专利申请的优先权, 其全部内容通过引 用结合在本申请中。
技术领域
本发明涉及通信技术领域, 尤其涉及千扰协调方法、 系统及一种网络节点。
背景技术
作为两大基本双工制式之一的时分双工 (Time Division Duplex, TDD )模式, 在宽带 移动通信对带宽需求不断增长的背景下, 受到了越来越多的关注。 TDD系统中上行和下行 传输使用相同的频率资源, 通过时分复用进行上 /下行数据传输。 在常见的 TDD系统中, 包括第三代移动通信标准 (3G ) 的时分同步码分多址 (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA ) 系统和第四代移动通信标准(4G ) 的时分长期演 进(Time Division-Long Term Evolution, TD-LTE ) 系统, 上行和下行的划分是静态或半静 态的, 通常的做法是在网络规划过程中根据小区类型和大致的业务比例确定上下行比例并 保持不变, 这在宏小区 (Macro Cell ) 大覆盖的背景下是较为筒单的做法, 并且也较为有 效。 但是随着技术发展, 出现越来越多的微小区 (Pico Cell), 家庭基站 (Home NodeB)等低 功率基站被用于小覆盖范围的部署, 即小小区 (Small Cell ), 在这类小区中, 用户数可能 较少且用户业务需求变化较大, 因此小区的上下行业务比例存在动态变化的需求。 虽然当 前 TD-LTE标准也支持改变小区的上下行子帧比例, 但是一般认为变更周期较长, 比如几 天变更一次, 这样就不能实时跟踪业务变化情况进行动态 TDD上 /下行(UL/DL ) 配置调 整。 基于此, LTE R11引入了动态 TDD UL/DL 配置, 将 TDD UL/DL配置变更周期由若 千天变为了若千毫秒, 从而可以提高系统资源利用率。
1 ) 下面介绍一下 LTE TDD系统的帧结构。
LTE TDD系统如图 1所示, 一个无线帧长度为 10ms, 包含特殊子帧和常规子帧两类 共 10个子帧,每个子帧为 lms。特殊子帧分为 3个时隙:下行导频时隙( Downlink Pilot Slot, DwPTS )、 保护间隔 (Guard Period, GP)和上行导频时隙 ( Uplink Pilot Slot, UpPTS )。 常规 子帧又分为上行子帧和下行子帧, 分别用于传输上行 /下行控制信令和业务数据等。
2 ) LTE TDD UL/DL配置
LTE TDD系统一共定义了如下面的 7种 TDD UL/DL配置,如下表 1所示。这 7种 TDD UL/DL配置共同的特点如下: 一个无线帧中, 可以配置两个特殊子帧 (子帧 #1和 #6), 也可 以仅配置一个特殊子帧 (子帧 #1); 子帧 #0和子帧 #5以及特殊子帧中的 DwPTS时隙总是用 作下行传输; 子帧 #2以及特殊子帧中的 UpPTS时隙总是用于上行传输; 其他子帧可以依 据需要配置为用作上行传输或者下行传输。
LTE TDD UL/DL子帧配置
Figure imgf000004_0001
3 )动态 TDD UL/DL配置变更
LTE R8的 TDD UL/DL配置方式是静态或者半静态的, 不能根据业务特征灵活的调整
TDD UL/DL 配置, 因此不利于提升系统资源利用率、 更好的保证业务传输的业务盾量 ( Quality of Service, QoS )。 基于此, LTE TDD UL/DL 千扰管理以及业务自适应增强 ( Enhancement to LTE TDD for DL-UL Interference Management and Traffic Adaptation, LTE Rll elMTA )项目引入了动态 TDD UL/DL配置变更机制, 将 TDD UL/DL配置变更频率由 若千天缩短为若千毫秒( ms )。 当 TDD UL/DL配置变更, 基站需要通知终端, 目前的通知 机制有多种, 筒单介绍如下:
Altl : 广播方式
具体可以釆用系统消息更新方式或者釆用类似地震海啸预警系统 (Earthquake and Tsunami Warning System, ETWS )的通知方式, 对于系统消息更新方式允许的 TDD UL/DL 配置变更周期为 640ms, 对于类似 ETWS的通知方式允许的 TDD UL/DL配置变更周期为
Alt2: 专用信令方式
具体可以是无线资源控制( Radio Resource Control, RRC M言令、媒体接入控制( MAC ) 信令或者物理下行控制信道(Physical Downlink Control Channel, PDCCH )信令。 RRC信 令方式下允许的 TDD UL/DL 配置变更周期约为 200ms; MAC信令方式下允许的 TDD UL/DL配置变更周期约为几十 ms;
PDCCH信令方式下允许的 TDD UL/DL配置变更周期约为 10ms左右。
4 ) 异构网络场景下的动态 TDD UL/DL配置变更
统计表明, 传统的宏基站(Macro e B )单层覆盖网络已经不能满足人们对数据业务 速率和容量不断增长的需求。 因此, 3GPP 引入了分层组网的方式来解决该问题: 通过在 热点区域、 家庭室内环境、 办公环境等小覆盖环境布设一些低功率的基站, 获得小区分裂 的效果, 使得运营商能够为用户提供更高数据速率、 更低成本的业务。 这些低功率基站下 的 cell可以称为 Small CelL Macro Cell和 Small Cell共同组成网络可以称为异构网络。
异构网络下 Small Cell允许使用动态 TDD UL/DL配置,但是为了避免 Small Cell之间 的交叉千扰,一种解决方式就是将 Small Cell组成若千个小区簇( Cell Cluster ), Cell Cluster 内可以使用相同 TDD UL/DL配置,不同 Cell Cluster之间允许使用不同 TDD UL/DL配置。 该千扰协调机制称为基于 Cell Cluster 的千扰消除机制 (Cell Clustering Interference Mitigation, CCIM ),如图 2所示。此外, Cell Cluster还可能存在管理该 Cell Cluster的 cell , 可以称该 cell为 Cell Cluster的簇头。
现有的 CCIM机制可以避免 Small Cell之间的上 /下行交叉千扰, 但是在异构网络下, 如果 Macro Cell和 Small Cell为同频或者处于相邻频带( band ), 那么如果允许两者同时传 输将可能产生 Macro和 Small Cell之间以及 Macro UE和 Small Cell UE之间的上 /下行交叉 千扰。
发明内容
本发明实施例提供了千扰协调方法、 系统及一种网络节点, 用以在异构网络下, 避免 Macro Cell和 Small Cell为同频或者处于相邻 band时, 两者同时传输将可能产生的 Macro 和 Small Cell之间以及 Macro UE和 Small Cell UE之间的上 /下行交叉千扰。
本发明实施例提供的一种千扰协调方法, 包括:
第一网络节点确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和非 受限小区, 并将所述最小公共集合的相关信息通知给第二网络节点控制的受限小区和第三 网络节点控制的非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不变, 所 述受限小区仅允许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区允许使 用全部子帧进行数据传输;
第二网络节点接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制受 限小区仅允许使用所述最小公共集合内的子帧进行数据传输;
第三网络节点接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制非 受限小区允许使用全部子帧进行数据传输。
本发明实施例提供的一种千扰协调系统, 包括:
第一网络节点, 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小 区和非受限小区, 并将所述最小公共集合的相关信息通知给第二网络节点控制的受限小区 和第三网络节点控制的非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不 变, 所述受限小区仅允许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区 允许使用全部子帧进行数据传输;
第二网络节点, 用于接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制受限小区仅允许使用所述最小公共集合内的子帧进行数据传输;
第三网络节点, 用于接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制非受限小区允许使用全部子帧进行数据传输。
本发明实施例提供的一种网络节点, 包括:
确定单元, 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和 非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不变, 所述受限小区仅允 许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区允许使用全部子帧进行 数据传输;
通知单元, 用于将所述最小公共集合的相关信息通知给受限小区和非受限小区。 本发明实施例, 通过引入 TDD UL/DL配置的最小公共集合, 在 TDD UL/DL配置的 最 、公共集合内的子帧传输方向不允许变化, 该最小公共集合之外的子帧传输方向可以进 行动态调整。 这样可以避免仅使用 TDD UL/DL 配置的最小公共集合的小区和使用动态 TDD UL/DL配置的小区之间的上 /下行交叉千扰。
附图说明
图 1为现有 LTE TDD系统结构示意图;
图 2为现有异构网络场景示意图;
图 3为本发明实施例提供的一种千扰协调方法的流程示意图;
图 4为本发明实施例提供的一种千扰协调系统的结构示意图;
图 5为本发明实施例提供的一种网络节点的结构示意图。
具体实施方式
本发明实施例提供了千扰协调方法、 系统及一种网络节点, 用以在异构网络下, 避免 Macro cell和 Small Cell为同频或者处于相邻 band时, 两者同时传输将可能产生的 Macro 和 Small Cell之间以及 Macro UE和 Small Cell UE之间的上 /下行交叉千扰。
本发明实施例通过引入 TDD UL/DL配置的最小公共集合, 在 TDD UL/DL配置的最 'J、公共集合内的子帧传输方向不允许变化, 集合之外的子帧传输方向可以进行动态调整。 这样可以避免仅使用 TDD UL/DL配置的最小公共集合的小区和使用动态 TDD UL/DL配 置的小区之间的上 /下行交叉千扰。
下面结合附图对本发明实施例提供的技术方案进行说明。
参见图 3 , 本发明实施例提供的一种千扰协调方法, 包括:
S101、 第一网络节点确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小 区和非受限小区, 并将最小公共集合的相关信息通知给第二网络节点控制的受限小区和第 三网络节点控制的非受限小区; 其中, 最小公共集合内的子帧的传输方向保持不变, 受限 小区仅允许使用最小公共集合内的子帧进行数据传输, 非受限小区允许使用全部子帧进行 数据传输;
其中, TDD UL/DL配置的最小公共集合包括多个子帧,使得一组小区(小区个数 > 1 ) 内的所有小区必须保证在最小公共集合内的子帧传输方向不变。 该 TDD UL/DL配置的最 小公共集合可以由操作维护管理 ( Operation Administration and Maintenance, OAM ) 节点 配置或中心管理节点确定, 也可以由小区组内各个小区协商确定。
本发明中限定小区组内部分小区仅允许使用 TDD UL/DL配置的最小公共集合内的子 帧 (这些小区称为受限小区, 如果受限小区又分为若千簇, 那么称为受限小区簇), 而小 区组内其它小区则可以使用全部子帧 (这些小区称为非受限小区, 非受限小区也可以分为 若千簇, 可以称为非受限小区簇)。
5102、 第二网络节点接收第一网络节点通知的最小公共集合, 并控制受限小区仅允许 使用最小公共集合内的子帧进行数据传输;
5103、 第三网络节点接收第一网络节点通知的最小公共集合, 并控制非受限小区允许 使用全部子帧进行数据传输。
本发明中, 最小公共集合的相关信息为下列之一:
最小公共集合包含的子帧;
最 、公共集合包含的子帧之外的子帧;
允许使用的 TDD UL/DL配置集合。
较佳地,第一网络节点确定时分双工 TDD上下行 UL/DL配置的最小公共集合, 包括: 第一网络节点接收小区组内各个小区上报的或者小区组内各个小区所归属的簇头上 报的上下行业务量比例信息或上下行资源利用率信息;
第一网络节点根据上下行业务量比例信息或上下行资源利用率信息,确定 TDD UL/DL 配置的最小公共集合。
较佳地, 该方法还包括:
第一网络节点接收小区组内各个小区上报的是否支持动态 TDD UL/DL配置的能力信 息; 或者, 小区组内各个小区分别向其归属的簇头上报是否支持动态 TDD UL/DL配置的 能力信息,然后由第一网络节点从各个簇头接收该簇内各个小区是否支持动态 TDD UL/DL 配置的能力信息。
即小区组内各个小区需要向 OAM或者中心管理节点上 4艮是否支持动态 TDD UL/DL 配置的指示信息, 此外, 小区组内各个小区分别向其归属的簇头上报其是否支持动态 TDD UL/DL配置的能力信息, 然后由第一网络节点从各个簇头接收该簇内各个小区是否需要开 启动态 TDD UL/DL配置的指示信息。 较佳地, 该方法还包括:
小区组内各个小区向第一网络节点上报是否需要开启动态 TDD UL/DL配置的指示信 息; 或者小区组内各个小区分别向其归属的簇头上报是否需要开启动态 TDD UL/DL配置 的指示信息, 然后由小区簇内的簇头向第一网络节点上报该簇内各个小区是否需要开启动 态 TDD UL/DL配置的指示信息。
小区簇内各个小区通过小区间接口交互是否需要开启动态 TDD UL/DL配置的指示信 息, 然后由第一网络节点从小区组中的一个或者多个小区获取该小区组内各个小区是否需 要开启动态 TDD UL/DL配置的指示信息。
即小区组内各个小区或者小区组可以向 OAM或者中心管理节点上 4艮是否需要开启动 态 TDD UL/DL配置的指示信息或者小区组内各个小区分别向其归属的簇头上报其是否需 要开启动态 TDD UL/DL配置的能力信息, 然后由各个簇头分别向 OAM或者中心管理节 点上报该簇内的各个小区是否需要开启动态 TDD UL/DL配置的指示信息。
较佳地, 该方法还包括:
第二网络节点控制受限小区将最小公共集合的相关信息通知受限小区服务的 UE, 使 得 UE在最小公共集合内的子帧上维持数据收发, 其它子帧上不进行数据收发。
较佳地, 第二网络节点控制受限小区将最小公共集合的相关信息通知受限小区服务的 UE包括:
第二网络节点控制受限小区通过广播或专用信令将最小公共集合的相关信息通知受 限小区服务的 UE。
较佳地, 第二网络节点控制受限小区通过广播或专用信令, 釆用比特映射 ( bitmap ) 方式将最小公共集合的相关信息通知给受限小区服务的 UE。
即受限小区需要将 TDD UL/DL配置的最小公共集合通知受限小区服务的 UE, UE在 TDD UL/DL配置的最小公共集合内的子帧上维持数据收发, 其它子帧不进行上 /下行数据 收发。 具体通知方式可以釆用广播或专用信令(RRC/MAC/PDCCH ), 通知的内容可以是 最小公共配置集合内对应的子帧, 可以釆用 bitmap方式通知。
较佳地, 该方法还包括:
第二网络节点控制受限小区将 UE的物理上行链路控制信道(PUCCH )资源或探测用 参考信号 ( SRS ) 资源配置在最小公共集合包含的子帧内。
即为了保证 UE正常工作,受限小区需要将 UE的 PUCCH资源 /探测用参考信号( SRS, sounding reference signal )等资源配置在最小公共集合包含的子帧内, 同时, 最小公共集合 的配置需要保证受限小区可以接收广播和寻呼。
较佳地, 最小公共集合包含广播和寻呼发送的子帧。 即第一网络节点配置最小公共集 合时要保证受限小区内的 UE可以接收广播和寻呼, 也就是说用于广播和寻呼的子帧需要 包含在最小公共集合内。
较佳地, 第一网络节点, 为操作维护管理(OAM ) 节点或中心管理节点。
较佳地, 中心管理节点为宏基站( Macro e B )。
较佳地, 当最小公共集合的相关信息为最小公共集合包含的子帧时, 第三网络节点根 据第一网络节点通知的最小公共集合的相关信息, 控制非受限小区允许使用全部子帧进行 数据传输包括:
第三网络节点根据最小公共集合包含的子帧, 选择 TDD UL/DL配置, 并按照选择的 TDD UL/DL配置控制非受限小区进行数据传输。
由此可见, 本发明实施例中, OAM或者中心管理节点确定 TDD UL/DL配置的最小公 共集合后, 需要通知该小区组内每个小区或者小区簇, 进一步 OAM和中心管理节点还可 以确定小区组内非受限小区或者小区簇使用的 TDD UL/DL 配置。 如果通知的是 TDD UL/DL配置, 需要注意的是非受限小区或者小区簇使用的 TDD UL/DL配置要保证最小公 共配置集合内的各个子帧传输方向不会发生变化, 其它子帧可以灵活选择上下行传输方 向。
OAM或者中心管理节点确定 TDD UL/DL配置的最小公共集合,可能需要小区组内各 个小区或者小区簇提供一些辅助信息,比如小区组内每个小区或者每个小区簇的上 /下行业 务量比例信息或上 /下行资源利用率信息等。
下面给出几个具体实施例的介绍。
实施例 1 :
假设条件: Macro eNB和其覆盖范围内的 Small Cell组成一个小区组, Small Cell又可 以分为若千个 Small Cell cluster。
实施例步骤如下:
步骤一: 确定中心管理节点以及受限小区和非受限小区
由于 Macro eNB提供大范围覆盖, 所以可以选择 Macro eNB作为中心管理节点。 考虑到千扰情况, Macro eNB可能会千扰其覆盖范围内任何一个小区, 因此可以选择
Macro eNB下的小区作为受限小区, 其它 Small Cell作为非受限小区。 这种情况下 Macro eNB可以获知 Macro cell是否支持动态 TDD配置的能力信息以及是否需要开启动态 TDD 配置的指示信息, 因此实施例中仅介绍了 Macro eNB和 Small Cell (或 Small Cell Cluster ) 之间交互。
步骤二:中心管理节点获取其管理的小区是否支持动态 TDD UL/DL配置的能力信息。
Macro eNB通过基站间接口 (比如 X2接口或者类似接口 )获取各个 small cell是否支 持动态 TDD UL/DL配置的能力信息。 该消息可以在 X2接口建立 ( X2 setup )或者 eNB 酉己 H斤 ( eNB configuration update ) ϊ±矛呈中 互。 步骤三: 中心管理节点评估是否需要启用 TDD UL/DL配置的最小公共集合。
只要如下条件中一个或多个满足, 那么 Macro e B确定可以启用 TDD UL/DL配置最 小公共集合:
Macro eNB覆盖范围内有 Small Cell (或 Small Cell Cluster )支持动态 TDD UL/DL配 置。
Macro eNB下有部分或者全部 Small Cell (或 Small Cell Cluster ) 向 Macro eNB指示 需要开启动态 TDD UL/DL配置。
Macro eNB根据 Small Cell (或 Small Cell Cluster )提供的辅助信息确定其覆盖范围内 部分或者全部 Small CelK或 Small Cell Cluster )需要开启动态 TDD UL/DL配置。 Small Cell (或 Small Cell Cluster )提供的辅助信息可以是 Small Cell (或 Small Cell Cluster )上下行 业务量信息或者上下行业务量对比信息或者上 /下行资源利用率信息, 比如上 /下行物理资 源块利用率 ( UL/DL Physical Resource Block usage , UL/DL PRB usage)。
步骤四: 中心管理节点确定 TDD UL/DL配置的最小公共集合。
Macro eNB根据 Macro UE的数据传输需求、 Macro eNB覆盖范围内各个 Small Cell (或 Small Cell Cluster )提供的辅助信息、 混合自动重传( HARQ , Hybrid- ARQ ) /调度时 间 (Scheduling timing ), Macro下 UE接收广播或者寻呼的子帧要求等一个或者多个因素 确定确定 TDD UL/DL 配置的最小公共集合。 以根据 Macro UE 的数据传输需求、 HARQ/Scheduling timing, 满足 Macro UE的广播接收需求为例, 可以按照如下方式确定最 小公共集合: 首先根据 Macro UE的上下行数据传输需求, 确定需要的上 /下行子帧个数, 然后根据广播接收需求确定必须包含的下行子帧 (子帧 #0和子帧 #5 ), 然后其它上 /下行子 帧的选择只要能够满足所选的 UL/DL子帧符合 TDD系统的 HARQ/Scheduling timing即可。
步骤五: 中心管理节点将其确定的 TDD UL/DL配置的最小公共集合通知给受限小区 / 小区簇和非受限小区 /小区簇。
Macro eNB将 TDD UL/DL配置的最小公共集合通知 Small CelK或 Small Cell Cluster ) 和 Macro Cell下的 Macro UE时可以釆用 bitmap方式。 比如 TDD UL/DL配置的最小公共 集合为子帧 {0, 1,2,5 }。 那么 bitmap可以表示为 { 1, 1, 1,0,0, 1,0,0,0,0}或者 {0,0,0, 1, 1,0, 1, 1, 1, 1 }。
Macro eNB通知 Small Cell (或 Small Cell Cluster )和通知 Macro UE时通知方式不同 之处在于通知 Small Cell (或 Small Cell Cluster ) 时是通过基站间接口 (X2接口或者类似 接口)通知, 而通知 UE时则可以釆用广播或者专用信令(RRC、 MAC或者 PDCCH ) 方 式通知。 如果釆用 RRC信令, 可以使用 RRC重配过程。
步骤六: 非受限小区根据 TDD UL/DL配置的最小公共集合选择 TDD UL/DL配置。
Small Cell (或 Small Cell Cluster )接收到该 TDD UL/DL配置的最小公共集合后, 可 以根据自身上下行传输需求确定该 Small Cell (或 Small Cell Cluster )使用的 TDD UL/DL 配置, 其选取的 TDD UL/DL配置只要保证最小公共集合内的子帧传输方向和 Macro e B 的传输方向相同即可, 其它子帧的传输方向可以动态调整。
步骤七:受限小区下 UE根据 TDD UL/DL配置的最小公共集合进行上 /下行数据传输。 Macro UE只允许在 TDD UL/DL配置的最小公共集合内的子帧上进行上 /下行数据传 输, 其它子帧上不允许进行上 /下行数据传输。 包括:
对于下行子帧, 停止 PDCCH/物理下行链路共享信道 (Physical Downlink Shared
Channel, PDSCH ) /公共参考信号 ( Common Reference Signal, CRS ) /信道状态信息参考 符号 ( Channel State Information-Reference Signal, CSI-RS )等接收;
对于上行子帧, 停止 PUCCH/物理上行链路共享信道( PUSCH ) /SRS/分组随机接入信 道( Packet Random Access Channel, PRACH ) 等发送。
此外, Macro UE的 PUCCH/SRS等配置也需要配置在最小公共集合内的子帧上。 步骤八: 中心管理节点进行 TDD UL/DL配置的最小公共集合调整。
Macro Cell后续可以根据自身负荷、 Small Cell (或 Small Cell Cluster )的负荷等因素 调整该 TDD UL/DL配置的最小公共集合, 一旦该 TDD UL/DL配置的最小公共集合发生 调整, 那么需要重复步骤四、 五、 六、 七。
实施例 2:
实施例 2的实施例^!设和实施例 1相同, 主要区别在于实施例 1中心管理节点通知受 限小区和非受限小区以及受限小区通知其服务的 UE的是 TDD UL/DL配置的最小公共集 合, 而实施例 2通知的是 TDD UL/DL配置的最小公共集合外的子帧集合。
实施例 2除步骤五、 六、 七外, 其它步骤和实施例 1均相同, 这里仅介绍不同的步骤:
1 ) 步骤五和实施例 1不同之处在于:
实施例 1中步骤五中 Macro eNB通知给 Small Cell (或 Small Cell Cluster )和 UE的是 TDD UL/DL配置的最小公共集合,而实施例 2中通知的是 TDD UL/DL配置的最小公共集 合之外的其它子帧, 即假设 Macro eNB确定的 TDD UL/DL配置的最小公共集合为子帧 {0,1,2,5} , 那么这里通知的集合是 {3,4,6,7,8,9}。
2 ) 步骤六和实施例 1不同之处在于:
Small Cell (或 Small Cell Cluster )在进行动态 TDD UL/DL配置变更时,只允许 Macro eNB变更步骤五中指示的集合内的子帧的上 /下行传输方向。
3 ) 步骤七和实施例 1的不同之处在于:
Macro UE在 Macro eNB指示的集合内不允许进行上 /下行数据传输。 包括: 对于下行子帧, 停止 PDCCH/PDSCH/CRS/CSI-RS等接收;
对于上行子帧, 停止 PUCCH/PUSCH/SRS/PRACH等发送。
实施例 3: 实施例 3的实施例個设和实施例 1相同, 该实施例 3和实施例 1的主要区别在于: 中 心管理节点通知非受限小区 /小区簇的是该小区 /小区簇具体使用的 TDD UL/DL配置。该实 施例 3和实施例 1的区别主要在于步骤五和六, 其它步骤完全相同。
实施例 1步骤五中 Macro eNB指示给 Small Cell (或 Small Cell Cluster ) 的是 TDD UL/DL配置的最小公共集合, 而这里 Macro eNB指示给 Small Cell (或 Small Cell Cluster ) 的则是 Small Cell (或 Small Cell Cluster )具体可以使用的 TDD UL/DL配置。
对于本实施例 3 , 实施例 1中步骤六可以省略。
实施例 4:
实施例 4的 支设条件和实施例 1相同, 该实施例 4和实施例 2的主要区别在于: 受限 小区通知其服务 UE的是 TDD UL/DL配置的最小公共集合之外的子帧, 并且指示给非受 限小区 /小区簇的是其具体使用的 TDD UL/DL配置。 该实施例 4和实施例 2的区别主要在 于步骤五和六, 其它步骤完全相同。
实施例 2步骤五中 Macro eNB指示给 Small CelK或 Small Cell Cluster )的是 TDD UL/DL 配置的最小公共集合外的子帧集合,而本实施例 4中 Macro eNB指示给 Small CelK或 Small Cell Cluster )的则是 Small Cell (或 Small Cell Cluster )具体可以使用的 TDD UL/DL配置。
对于本实施例 4, 实施例 2中的步骤六可以省略。
实施例 5:
实施例 5的個设条件和实施例 1一致, 和实施例 1不同的是, 实施例 5中由 OAM确 定 TDD UL/DL配置的最小公共集合。
步骤如下:
步骤一: OAM获取小区组内各个小区对 TDD UL/DL配置的能力支持信息。
Macro和 Small Cell组成的小区组内每个小区分别向 OAM上报其是否支持动态 TDD UL/DL配置的能力信息。
步骤二: OAM评估是否需要启用 TDD UL/DL配置的最小公共集合。
只要如下条件中一个或多个满足, 那么 OAM确定可以启用 TDD UL/DL配置的最小 公共集合:
小区组内有小区或者小区簇支持动态 TDD UL/DL配置。
小区组内有部分或者全部小区簇向 OAM指示需要开启动态 TDD UL/DL配置。
OAM根据小区或者小区簇提供的辅助信息确定其管理的部分或者全部小区需要开启 动态 TDD UL/DL配置。 小区或者小区簇向 OAM提供的辅助信息可以是小区或者小区簇 上下行业务量信息或者上下行业务量对比信息或者上 /下行资源利用率信息(比如 UL/DL PRB usage)。
步骤三: OAM确定受限小区 /小区簇和非受限小区 /小区簇。 根据千扰情况 OAM可以确定受限小区 /小区簇和非受限小区 /小区簇。 比如将 Macro e B下的小区划分为受限小区 /小区簇,将 Small Cell/Small Cell 划分为非受限小区 /小区簇。
步骤四: OAM确定 TDD UL/DL配置的最小公共集合。
OAM根据小区簇内的数据传输需求、 各个小区提供的辅助信息、 HARQ/Scheduling timing, Macro下 UE接收广播或者寻呼的子帧要求等一个或者多个因素确定 TDD UL/DL 配置的最小公共集合。 以根据 Macro UE的数据传输需求、 HARQ/Scheduling timing, 满足 Macro UE的广播接收需求为例,可以按照如下方式确定最小公共集合:首先根据 Macro UE 的上下行数据传输需求, 确定需要的上 /下行子帧个数, 然后根据广播接收需求确定必须包 含的下行子帧(子帧 #0和子帧 #5 ),然后其它上 /下行子帧的选择只要能够满足所选的 UL/DL 子帧符合 TDD系统的 HARQ/Scheduling timing即可。
步骤五: OAM将其确定的 TDD UL/DL配置的最小公共集合通知给 Small CelK或 Small Cell Cluster )和 Macro celL
OAM将 TDD UL/DL配置的最小公共集合通知 Small Cell (或 Small Cell Cluster )和 Macro CelL
eNB将 TDD UL/DL配置的最小公共集合通知 Macro UE时可以釆用 bitmap方式。 比 如 TDD UL/DL 配置的最小公共集合为子帧 {0, 1,2,5 }。 那么 bitmap 可以表示为
{ 1, 1, 1,0,0, 1,0,0,0,0}或者 {0,0,0, 1, 1,0, 1, 1, 1, 1 }。
Macro eNB通知 Macro UE时可以釆用广播或者专用信令 ( RRC、 MAC或者 PDCCH ) 方式通知。 如果釆用 RRC信令, 可以使用 RRC重配过程。
步骤六: Small Cell (或 Small Cell Cluster )根据 TDD UL/DL配置的最小公共集合选
# TDD UL/DL配置。
Small cell cluster接收到该 TDD UL/DL配置的最小公共集合后, 可以根据自身上下行 传输需求确定该 Small CelK或 Small Cell Cluster )使用的 TDD UL/DL配置,其选取的 TDD UL/DL配置只要保证最小公共集合内的子帧传输方向和 Macro eNB的传输方向相同即可, 其它子帧的传输方向可以动态调整。
步骤七: Macro UE根据 TDD UL/DL配置的最小公共集合进行上 /下行数据传输。
MacroUE只允许在 TDD UL/DL配置的最小公共集合内的子帧上进行上 /下行数据传 输, 其它子帧上不允许进行上 /下行数据传输。 包括:
对于下行子帧, 停止 PDCCH/PDSCH/CRS/CSI-RS等接收;
对于上行子帧, 停止 PUCCH/PUSCH/SRS/PRACH等发送;
此外, MacroUE的 PUCCH/SRS等配置也需要配置在最小公共集合内的子帧上。
步骤八: OAM进行 TDD UL/DL配置的最小公共集合调整。
OAM后续可以根据小区簇内各个小区上报的辅助信息调整该 TDD UL/DL配置的最小 公共集合, 一旦该 TDD UL/DL配置的最小公共集合发生调整, 那么需要重复步骤四、 五、 说明: 和实施例 2/3/4类似, OAM通知给受限小区 /小区簇和非受限小区 /小区簇的也 可以是 TDD UL/DL配置集合之外的子帧集合, OAM通知给非受限小区 /小区簇的也可以 是其 TDD UL/DL配置, 流程和实施例 5类似, 这里不再——列举。
实施例 6:
以一个 Small Cell Cluster为一组小区,其中有小区不支持动态 TDD UL/DL配置为例。 步骤如下:
步骤一: 中心管理节点获取其管理的各个小区是否支持动态 TDD UL/DL配置的能力 信息, Small Cell Cluster内的主小区可以作为中心管理节点。
主小区可以根据小区间接口建立或者更新时交互的信息 (比如 X2 setup 或者 eNB configuration update ) 中携带的动态 TDD UL/DL 配置能力支持信息确定该 Small Cell Cluster内哪些小区支持动态 TDD UL/DL配置。
步骤二: 中心管理节点确定受限小区和非受限小区。
Small Cell Cluster内的主小区(簇头)可以将 Small Cell Cluster内支持动态 TDD UL/DL 配置的小区作为非受限小区, 其它小区作为受限小区。
步骤三: 中心管理节点评估是否需要启用 TDD UL/DL配置的最小公共集合。
只要如下条件中一个或多个满足, 那么主小区确定可以启用 TDD UL/DL配置的最小 公共集合:
Small Cell Cluster内有 Small Cell支持动态 TDD UL/DL配置。
Small Cell Cluster内有部分或者全部小区向主小区指示需要开启动态 TDD UL/DL配 置。
Small Cell Cluster内主小区根据其内各个小区提供的辅助信息确定其管理的部分或者 全部小区需要开启动态 TDD UL/DL配置。 小区提供的辅助信息可以是小区或者小区簇上 下行业务量信息或者上下行业务量对比信息或者上 /下行资源利用率信息 (比如 UL/DL PRB usage)。
步骤四: 中心管理节点确定 TDD UL/DL配置的最小公共集合。
Small cell cluster内的主小区根据 Small Cell Cluster内各个小区的数据传输需求、 各个 小区提供的辅助信息、 HARQ/Scheduling timing, Macro下 UE接收广播或者寻呼的子帧要 求等一个或者多个因素确定 TDD UL/DL配置的最小公共集合。以根据 Macro UE的数据传 输需求、 HARQ/Scheduling timing, 满足 Macro UE的广播接收需求为例, 可以按照如下方 式确定最小公共集合: 首先根据 Macro UE的上下行数据传输需求, 确定需要的上 /下行子 帧个数, 然后根据广播接收需求确定必须包含的下行子帧 (子帧 #0和子帧 #5 ), 然后其它 上 /下行子帧的选择只要能够满足所选的 UL/DL子帧符合 TDD 系统的 HARQ/Scheduling timing即可。
步骤五: 中心管理节点将其确定 TDD UL/DL配置的最小公共集合通知给受限小区和 非受限小区主小区将 TDD UL/DL配置的最小公共集合通过小区间接口(比如 X2接口或类 似接口)通知 Small Cell Cluster 内的受限小区和非受限小区。 受限小区接收到该 TDD UL/DL配置的最小公共集合后还需要通过广播或者专用信令(RRC、 MAC或者 PDCCH ) 方式通知其服务的 UE。 如果釆用 RRC信令, 可以使用 RRC重配过程。
通知可以釆用 bitmap方式。 比如 TDD UL/DL配置的最小公共集合为子帧 {0, 1,2,5 }。 那么 bitmap可以表示为 { 1, 1, 1,0,0, 1,0,0,0,0}或者 {0,0,0, 1, 1,0, 1, 1, 1, 1 }。
进一步主小区还可以直接确定非受限小区的 TDD UL/DL配置, 并通过基站间接口通 知给非受限小区。 这种情况下, 可选的, 主小区可以不再通知非受限小区 TDD UL/DL配 置的最小公共集合。
步骤六: 受限小区服务的 UE的行为。
受限小区的 UE只允许在 TDD UL/DL配置的最小公共集合内的子帧上进行上 /下行数 据传输, 其它子帧上不允许进行上 /下行数据传输。 包括:
对于下行子帧, 停止 PDCCH/PDSCH/CRS/CSI-RS等接收;
对于上行子帧, 停止 PUCCH/PUSCH/SRS/PRACH等发送;
此外, 受限小区的 PUCCH/SRS等配置也需要配置在最小公共集合内的子帧上。
步骤七: 中心管理节点进行 TDD UL/DL配置的最小公共集合调整。
主小区后续可以根据该 Small Cell Cluster 内各个小区上报的辅助信息调整该 TDD
UL/DL配置的最小公共集合, 一旦该 TDD UL/DL配置的最小公共集合发生调整, 那么需 要重复步骤四、 五、 六。
参见图 4 , 本发明实施例提供的一种千扰协调系统, 包括:
第一网络节点 11 , 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限 小区和非受限小区, 并将最小公共集合的相关信息通知给第二网络节点控制的受限小区和 第三网络节点控制的非受限小区; 其中, 最小公共集合内的子帧的传输方向保持不变, 述 受限小区仅允许使用最小公共集合内的子帧进行数据传输, 非受限小区允许使用全部子帧 进行数据传输;
第二网络节点 12 , 用于接收第一网络节点 11通知的最小公共集合的相关信息, 并控 制受限小区仅允许使用最小公共集合内的子帧进行数据传输;
第三网络节点 13 , 用于接收并根据第一网络节点通知的最小公共集合的相关信息, 控 制非受限小区允许使用全部子帧进行数据传输。
较佳地,第一网络节点 11接收小区组内各个小区上报的或者小区组内各个小区所归属 的簇头上报的上下行业务量比例信息或上下行资源利用率信息; 根据上下行业务量比例信 息或上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
较佳地,第一网络节点 11接收小区组内各个小区上报的是否支持动态 TDD UL/DL配 置的能力信息; 或者, 小区组内各个小区分别向其归属的簇头上报是否支持动态 TDD UL/DL配置的能力信息, 然后第一网络节点 11从各个簇头接收该簇内各个小区是否支持 动态 TDD UL/DL配置的能力信息。
较佳地,
小区组内各个小区向第一网络节点 11上报是否需要开启动态 TDD UL/DL配置的指 示信息, 或者小区组内各个小区分别向其归属的簇头上报是否需要开启动态 TDD UL/DL 配置的指示信息,然后由第一网络节点 11从各个簇头接收该簇内各个小区是否需要开启动 态 TDD UL/DL配置的指示信息。
较佳地,
第二网络节点 12控制受限小区将最小公共集合的相关信息通知受限小区服务的 UE, 使得 UE在最小公共集合内的子帧上维持数据收发, 其它子帧上不进行数据收发。
较佳地, 第二网络节点 12控制受限小区将所述最小公共集合的相关信息通知受限小 区服务的 UE包括:
第二网络节点 12控制受限小区通过广播或专用信令将最小公共集合的相关信息通知 受限小区服务的 UE。
较佳地, 第二网络节点 12控制受限小区通过广播或专用信令, 釆用比特映射 bitmap 方式将最小公共集合的相关信息通知给受限小区服务的 UE。
较佳地, 第二网络节点 12控制受限小区将 UE的物理上行链路控制信道 PUCCH资源 或探测用参考信号 SRS资源配置在最小公共集合包含的子帧内。
较佳地, 最小公共集合包含广播和寻呼发送的子帧。
较佳地, 第一网络节点 11 , 为操作维护管理 OAM节点或中心管理节点。
较佳地, 中心管理节点为宏基站 Macro e B。
较佳地, 最小公共集合的相关信息为下列信息之一:
最小公共集合包含的子帧;
最 、公共集合包含的子帧之外的子帧;
允许使用的 TDD UL/DL配置集合。
相应地, 本发明实施例提供的一种网络节点, 即上述第一网络节点, 包括: 确定单元, 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和 非受限小区; 其中, 最小公共集合内的子帧的传输方向保持不变, 受限小区仅允许使用最 小公共集合内的子帧进行数据传输, 非受限小区允许使用全部子帧进行数据传输; 通知单元, 用于将最小公共集合的相关信息通知给受限小区和非受限小区。
较佳的, 确定单元, 接收小区组内各个小区上报的或者小区组内各个小区所归属的簇 头上 4艮的上下行业务量比例信息或上下行资源利用率信息; 根据上下行业务量比例信息或 上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
较佳的, 该网络节点还包括:
能力信息接收单元, 用于接收小区组内各个小区上报的是否支持动态 TDD UL/DL配 置的能力信息; 或者, 用于接收小区组内各个小区所归属的簇头上报的各个小区是否支持 动态 TDD UL/DL配置的能力信息。
较佳的, 该网络节点还包括:
指示信息接收单元,用于接收小区组内各个小区上报的是否需要开启动态 TDD UL/DL 配置的指示信息, 或者用于接收小区组内各个小区所归属的簇头上报的各个小区是否需要 开启动态 TDD UL/DL配置的指示信息。
较佳的, 网络节点, 为操作维护管理 OAM节点或中心管理节点。
较佳的, 中心管理节点为宏基站 Macro e B。
本发明实施例还提供了另一种网络节点, 即上述第一网络节点,其结构如附图 5所示, 具体包括处理器 51和存储器 52, 其中, 处理器 51根据预先配置的计算机程序实现上述方 法流程中第一网络节点的功能, 存储器 52存储所述计算机程序的代码。 具体的:
处理器 51 , 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和 非受限小区; 其中, 最小公共集合内的子帧的传输方向保持不变, 受限小区仅允许使用最 小公共集合内的子帧进行数据传输, 非受限小区允许使用全部子帧进行数据传输, 将最小 公共集合的相关信息通知给受限小区和非受限小区。
较佳地, 处理器用于, 接收小区组内各个小区上报的或者小区组内各个小区所归属的 簇头上报的上下行业务量比例信息或上下行资源利用率信息; 根据上下行业务量比例信息 或上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
较佳地, 处理器还用于, 接收小区组内各个小区上报的是否支持动态 TDD UL/DL配 置的能力信息; 或者, 用于接收小区组内各个小区所归属的簇头上报的各个小区是否支持 动态 TDD UL/DL配置的能力信息。
较佳地, 收发接口还用于, 接收小区组内各个小区上报的是否需要开启动态 TDD UL/DL配置的指示信息,或者用于接收小区组内各个小区所归属的簇头上报的各个小区是 否需要开启动态 TDD UL/DL配置的指示信息。
较佳的, 网络节点, 为操作维护管理 OAM节点或中心管理节点。
较佳的, 中心管理节点为宏基站 Macro eNB。
综上所述, 本发明给出了一种动态 TDD UL/DL配置下的千扰协调方法和系统, 即引 入 TDD UL/DL配置的最小公共集合, 在 TDD UL/DL配置的最小公共集合内的子帧传输 方向不允许变化, 集合之外的子帧传输方向可以进行动态调整。 这样可以避免仅使用 TDD UL/DL配置的最小公共集合的小区和使用动态 TDD UL/DL配置的小区之间的上 /下行交叉 千扰。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 系统、 或计算机程序产 品。 因此, 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实 施例的形式。 而且, 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 (包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形 式。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器, 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 系统。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中, 使得存储在该计算机可读存储器中的指令产生包括指令系 统的制造品, 该指令系统实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理, 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种千扰协调方法, 其特征在于, 该方法包括:
第一网络节点确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和非 受限小区, 并将所述最小公共集合的相关信息通知给第二网络节点控制的受限小区和第三 网络节点控制的非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不变, 所 述受限小区仅允许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区允许使 用全部子帧进行数据传输;
第二网络节点接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制受 限小区仅允许使用所述最小公共集合内的子帧进行数据传输;
第三网络节点接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制非 受限小区允许使用全部子帧进行数据传输。
2、 根据权利要求 1所述的方法, 其特征在于, 所述第一网络节点确定时分双工 TDD 上下行 UL/DL配置的最小公共集合, 包括:
所述第一网络节点接收小区组内各个小区上报的或者小区组内各个小区所归属的簇 头上报的上下行业务量比例信息或上下行资源利用率信息;
所述第一网络节点根据上下行业务量比例信息或上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
3、 根据权利要求 1所述的方法, 其特征在于, 该方法还包括:
所述第一网络节点接收小区组内各个小区上报的是否支持动态 TDD UL/DL配置的能 力信息; 或者, 小区组内各个小区分别向其归属的簇头上 4艮是否支持动态 TDD UL/DL配 置的能力信息, 然后由所述第一网络节点从各个簇头接收该簇内各个小区是否支持动态 TDD UL/DL配置的能力信息。
4、 根据权利要求 1所述的方法, 其特征在于, 该方法还包括:
小区组内各个小区向所述第一网络节点上报是否需要开启动态 TDD UL/DL配置的指 示信息, 或者小区组内各个小区分别向其归属的簇头上报是否需要开启动态 TDD UL/DL 配置的指示信息, 然后由所述第一网络节点从各个簇头接收该簇内各个小区是否需要开启 动态 TDD UL/DL配置的指示信息。
5、 根据权利要求 1所述的方法, 其特征在于, 该方法还包括:
第二网络节点控制受限小区将所述最小公共集合的相关信息通知受限小区服务的 UE, 使得 UE在所述最小公共集合内的子帧上维持数据收发, 其它子帧上不进行数据收发。
6、 根据权利要求 5 所述的方法, 其特征在于, 所述第二网络节点控制受限小区将所 述最小公共集合的相关信息通知受限小区服务的 UE包括: 第二网络节点控制受限小区通过广播或专用信令将所述最小公共集合的相关信息通 知受限小区服务的 UE。
7、 根据权利要求 6 所述的方法, 其特征在于, 第二网络节点控制受限小区通过广播 或专用信令,釆用比特映射 bitmap方式将所述最小公共集合的相关信息通知给受限小区服 务的 UE。
8、 根据权利要求 1所述的方法, 其特征在于, 该方法还包括:
第二网络节点控制受限小区将 UE的物理上行链路控制信道 PUCCH资源或探测用参 考信号 SRS资源配置在所述最小公共集合包含的子帧上。
9、 根据权利要求 1 所述的方法, 其特征在于, 所述最小公共集合包含广播和寻呼发 送的子帧。
10、 根据权利要求 1-9任一项所述的方法, 其特征在于, 所述第一网络节点, 为操作 维护管理 OAM节点或中心管理节点。
11、 根据权利要求 10所述的方法, 其特征在于, 所述中心管理节点为宏基站 Macro e肌
12、 根据权利要求 1-9任一项所述的方法, 其特征在于, 所述最小公共集合的相关信 息为下列之一:
所述最小公共集合包含的子帧;
所述最小公共集合包含的子帧之外的子帧;
允许使用的 TDD UL/DL配置集合。
13、 根据权利要求 12 所述的方法, 其特征在于, 当所述最小公共集合的相关信息为 最小公共集合包含的子帧时, 所述第三网络节点根据第一网络节点通知的最小公共集合的 相关信息, 控制非受限小区允许使用全部子帧进行数据传输包括:
第三网络节点根据最小公共集合包含的子帧, 选择 TDD UL/DL配置, 并按照选择的 TDD UL/DL配置控制非受限小区进行数据传输。
14、 一种千扰协调系统, 其特征在于, 该系统包括:
第一网络节点, 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小 区和非受限小区, 并将所述最小公共集合的相关信息通知给第二网络节点控制的受限小区 和第三网络节点控制的非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不 变, 所述受限小区仅允许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区 允许使用全部子帧进行数据传输;
第二网络节点, 用于接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制受限小区仅允许使用所述最小公共集合内的子帧进行数据传输;
第三网络节点, 用于接收并根据所述第一网络节点通知的最小公共集合的相关信息, 控制非受限小区允许使用全部子帧进行数据传输。
15、 根据权利要求 14 所述的系统, 其特征在于, 所述第一网络节点接收小区组内各 个小区上报的或者小区组内各个小区所归属的簇头上报的上下行业务量比例信息或上下 行资源利用率信息; 根据上下行业务量比例信息或上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
16、 根据权利要求 14所述的系统, 其特征在于,
所述第一网络节点接收小区组内各个小区上报的是否支持动态 TDD UL/DL配置的能 力信息; 或者, 小区组内各个小区分别向其归属的簇头上报是否支持动态 TDD UL/DL配 置的能力信息,然后所述第一网络节点从各个簇头接收该簇内各个小区是否支持动态 TDD UL/DL配置的能力信息。
17、 根据权利要求 14所述的系统, 其特征在于,
小区组内各个小区向所述第一网络节点上报是否需要开启动态 TDD UL/DL配置的指 示信息, 或者小区组内各个小区分别向其归属的簇头上报是否需要开启动态 TDD UL/DL 配置的指示信息, 然后由所述第一网络节点从各个簇头接收该簇内各个小区是否需要开启 动态 TDD UL/DL配置的指示信息。
18、 根据权利要求 14所述的系统, 其特征在于,
所述第二网络节点控制受限小区将所述最小公共集合的相关信息通知受限小区服务 的 UE,使得 UE在所述最小公共集合内的子帧上维持数据收发,其它子帧上不进行数据收 发。
19、 根据权利要求 18 所述的系统, 其特征在于, 所述第二网络节点控制受限小区将 所述最小公共集合的相关信息通知受限小区服务的 UE包括:
所述第二网络节点控制受限小区通过广播或专用信令将所述最小公共集合的相关信 息通知受限小区服务的 UE。
20、 根据权利要求 19 所述的系统, 其特征在于, 所述第二网络节点控制受限小区通 过广播或专用信令,釆用比特映射 bitmap方式将所述最小公共集合的相关信息通知给受限 小区月艮务的 UE。
21、 根据权利要求 14 所述的系统, 其特征在于, 所述第二网络节点控制受限小区将 UE的物理上行链路控制信道 PUCCH资源或探测用参考信号 SRS资源配置在所述最小公 共集合包含的子帧上。
22、 根据权利要求 14 所述的系统, 其特征在于, 所述最小公共集合包含广播和寻呼 发送的子帧。
23、 根据权利要求 14-22任一项所述的系统, 其特征在于, 所述第一网络节点, 为操 作维护管理 OAM节点或中心管理节点。
24、 根据权利要求 23 所述的系统, 其特征在于, 所述中心管理节点为宏基站 Macro e肌
25、 根据权利要求 14-22任一项所述的系统, 其特征在于, 所述最小公共集合的相关 信息为下列之一:
所述最小公共集合包含的子帧;
所述最小公共集合包含的子帧之外的子帧;
允许使用的 TDD UL/DL配置集合。
26、 一种网络节点, 其特征在于, 该网络节点包括:
确定单元, 用于确定时分双工 TDD上下行 UL/DL配置的最小公共集合、 受限小区和 非受限小区; 其中, 所述最小公共集合内的子帧的传输方向保持不变, 所述受限小区仅允 许使用所述最小公共集合内的子帧进行数据传输, 所述非受限小区允许使用全部子帧进行 数据传输;
通知单元, 用于将所述最小公共集合的相关信息通知给受限小区和非受限小区。
27、 根据权利要求 26 所述的网络节点, 其特征在于, 所述确定单元, 接收小区组内 各个小区上报的或者小区组内各个小区所归属的簇头上报的上下行业务量比例信息或上 下行资源利用率信息; 根据上下行业务量比例信息或上下行资源利用率信息, 确定 TDD UL/DL配置的最小公共集合。
28、 根据权利要求 26所述的网络节点, 其特征在于, 该网络节点还包括:
能力信息接收单元, 用于接收小区组内各个小区上报的是否支持动态 TDD UL/DL配 置的能力信息; 或者, 用于接收小区组内各个小区所归属的簇头上报的各个小区是否支持 动态 TDD UL/DL配置的能力信息。
29、 根据权利要求 26所述的网络节点, 其特征在于, 该网络节点还包括:
指示信息接收单元,用于接收小区组内各个小区上报的是否需要开启动态 TDD UL/DL 配置的指示信息, 或者用于接收小区组内各个小区所归属的簇头上报的各个小区是否需要 开启动态 TDD UL/DL配置的指示信息。
30、 根据权利要求 26-29任一权项所述的网络节点, 其特征在于, 所述网络节点, 为 操作维护管理 OAM节点或中心管理节点。
31、根据权利要求 30所述的网络节点,其特征在于,所述中心管理节点为宏基站 Macro e肌
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