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WO2013017016A1 - Procédé et dispositif de planification de sous-trame - Google Patents

Procédé et dispositif de planification de sous-trame Download PDF

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Publication number
WO2013017016A1
WO2013017016A1 PCT/CN2012/078835 CN2012078835W WO2013017016A1 WO 2013017016 A1 WO2013017016 A1 WO 2013017016A1 CN 2012078835 W CN2012078835 W CN 2012078835W WO 2013017016 A1 WO2013017016 A1 WO 2013017016A1
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WO
WIPO (PCT)
Prior art keywords
subframe
network side
side device
cell
variable
Prior art date
Application number
PCT/CN2012/078835
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English (en)
Chinese (zh)
Inventor
胡瑜涵
刘美
潘学明
Original Assignee
电信科学技术研究院
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Filing date
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Publication of WO2013017016A1 publication Critical patent/WO2013017016A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for scheduling a subframe.
  • the time division duplex (TDD) mode means that the uplink and downlink use the same working frequency band, and the uplink/downlink signals are transmitted at different time intervals.
  • GP guard interval
  • FDD frequency division duplex
  • GB guard bandwidth
  • LTE Long Term Evolution
  • a radio frame has a length of 10 ms and contains two types of special subframes and regular subframes. A total of 10 subframes, each subframe. For lms.
  • the special subframe is divided into three subframes: Downlink Pilot Slot (DwPTS) is used to transmit Primary Synchronization Signal (PSS), Physical Downlink Control Channel (PDCCH), and physical hybrid.
  • DwPTS Downlink Pilot Slot
  • PSS Primary Synchronization Signal
  • PDCCH Physical Downlink Control Channel
  • physical hybrid Physical hybrid
  • the regular subframe includes an uplink subframe and a downlink subframe, and is used for transmitting an uplink/downlink control channel and service data.
  • two special subframes located in subframe 1 and subframe 6) or a special subframe (located in subframe 1) can be configured.
  • Subframe 0 and subframe 5 and DwPTS subframes in special subframes are always used for downlink transmission.
  • Subframe 2 and UpPTS subframes in special subframes are always used for uplink transmission.
  • Other subframes can be configured as needed. For uplink transmission or downlink transmission.
  • the uplink and downlink transmissions use the same frequency resource, and the uplink/downlink signals are transmitted on different subframes.
  • the division of the uplink subframe and the downlink subframe is static or half.
  • the usual practice is to determine the proportion of the uplink/downlink subframes based on the cell type and the approximate traffic ratio during the network planning process. This is a relatively simple approach in the context of large coverage of macro cells, and is also more effective. With the development of technology, more and more micro cells (Pico cell), home base stations (Home NodeB), etc. The low-power base station is deployed to provide local small coverage. In such a cell, the number of users is small, and the user service demand changes greatly. Therefore, the uplink/downlink service ratio requirement of the cell dynamically changes.
  • the cross-slots of neighboring cells may be disturbed.
  • the femto cell is used for uplink signal reception in the time slot in which the macro cell transmits the downlink signal, and then appears between the two cells: the base station-base station is interfered, and the femto base station directly receives the Macro base station.
  • the downlink signal will seriously affect the shield of the femto base station receiving the uplink signal of the L-UE (Local UE, local UE).
  • the neighboring cells herein may be cells that are geographically adjacent and use the same TDD carrier (shown in Figure 1B), or cells that are geographically overlapping or using neighboring TDD carriers (shown in Figure 1C).
  • the uplink/downlink time slot configuration is consistent and determined according to the cell type and the approximate service ratio in the network planning process. Therefore, for each downlink subframe, the interference received by the neighboring base station is the downlink interference of the neighboring base station, and the interference is relatively constant, so it can be selected in a certain channel state information (CSI) reporting period.
  • CSI channel state information
  • One of the downlink subframes performs CSI measurement and is up.
  • the uplink/downlink slot configuration of each cell may be different.
  • the interference received by each downlink subframe may be the downlink interference of the neighboring base station, or may be the uplink interference of the UE under the neighboring base station, which may result in each downlink sub-interference.
  • the interference fluctuation of the frame is large, so the current CSI measurement mechanism can not reflect the change of the interference, which may easily cause the system performance to deteriorate.
  • the current CSI measurement mechanism cannot reflect the change of the interference, which may easily cause system performance to deteriorate.
  • a method and a device for scheduling a subframe are provided to solve the problem that the current CSI measurement mechanism cannot reflect the change of the interference, which may easily cause the system performance to deteriorate. The problem.
  • the network side device divides the subframes in one radio frame into multiple sets according to the subframe transmission direction that needs to be scheduled and the subframe configuration information of the strong interference cell adjacent to the target cell, where the radio frame includes a variable a frame and/or a fixed subframe, the variable subframe is a subframe with a variable transmission direction, and the fixed subframe is a subframe with a fixed transmission direction;
  • the network side device separately selects a subframe from each subframe set, and configures the user equipment according to the selected subframe;
  • the network side device acquires channel state information CSI corresponding to the selected subframe, and schedules all subframes in the set to which the corresponding subframe belongs according to the CSI.
  • a dividing module configured to transmit a subframe transmission direction according to a required subframe and a subframe of a strong interference cell adjacent to the target cell
  • the configuration information is divided into multiple sets of subframes in a radio frame, where the radio frame includes a variable subframe and/or a fixed subframe, and the variable subframe is a subframe with a variable transmission direction, and the fixed subframe is a subframe with a fixed transmission direction;
  • a configuration module configured to separately select a subframe from each subframe set, and configure the user equipment according to the selected subframe
  • a scheduling module configured to acquire CSI corresponding to the selected subframe, and schedule all subframes in the set to which the corresponding subframe belongs according to the CSI.
  • the embodiment of the present invention divides the subframes in one radio frame into multiple sets according to the subframe transmission direction that needs to be scheduled and the subframe configuration information of the strong interfering cell adjacent to the target cell, and then separately from each subframe set. Selecting a sub-frame, and scheduling all the subframes in the set to which the corresponding sub-frame belongs according to the CSI corresponding to the obtained selected sub-frame, thereby dynamically reflecting the change of the interference, and improving the change of the interference System performance and CSI measurement accuracy.
  • FIG. 1 is a schematic diagram of a frame structure of a TD-LTE system
  • FIG. 1B is a schematic diagram of cross-slot interference when using the same TDD carrier
  • 1C is a schematic diagram of cross-slot interference when using adjacent TDD carriers
  • FIG. 2 is a schematic flowchart of a method for scheduling a subframe according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a network side device for scheduling a subframe according to an embodiment of the present invention.
  • the network side device divides the subframes in one radio frame into multiple sets according to the subframe transmission direction scheduled to be scheduled and the subframe configuration information of the strong interfering cell adjacent to the target cell, and then separately from each sub-sub-frame. Selecting a subframe in the frame set, and configuring the user equipment according to the selected subframe, and scheduling all subframes in the set to which the corresponding subframe belongs according to the CSI corresponding to the obtained selected subframe, where the wireless frame
  • the variable subframe is a variable subframe
  • the fixed subframe is a subframe with a fixed transmission direction.
  • the fixed subframe is a subframe with a fixed transmission direction.
  • the embodiment of the present invention divides the subframes in one radio frame into multiple sets according to the subframe transmission direction that needs to be scheduled and the subframe configuration information of the strong interfering cell adjacent to the target cell, and according to the acquired selection.
  • the CSI corresponding to the subframe schedules all the subframes in the set to which the corresponding subframe belongs, so that the dynamic configuration of the TDD subframe can reflect the change of the interference, and improve the system performance and the CSI measurement accuracy.
  • the embodiments of the present invention can be applied to a TDD system (such as a TD-LTE system), and can also be applied to other systems that need to dynamically adjust an uplink/downlink configuration of a subframe, such as a TD-SCDMA system and its subsequent evolution system, and a microwave. Access to the Worldwide Interoperability for Microwave Access (WiMAX) system and its subsequent evolution systems.
  • WiMAX Worldwide Interoperability for Microwave Access
  • the method for scheduling a subframe in the embodiment of the present invention includes the following steps: Step 201: The network side device divides the subframes in one radio frame into multiple sets according to the subframe transmission direction that needs to be scheduled and the subframe configuration information of the strong interference cell adjacent to the target cell, where the radio frame includes a variable a subframe and/or a fixed subframe, the variable subframe is a subframe with a variable transmission direction, and the fixed subframe is a subframe with a fixed transmission direction;
  • Step 202 The network side device separately selects a subframe from each subframe set, and configures the user equipment according to the selected subframe.
  • Step 203 The network side device acquires CSI corresponding to the selected subframe, and schedules all subframes in the set to which the corresponding subframe belongs according to the CSI.
  • the radio frame includes a variable subframe and/or a fixed subframe, which indicates the following three cases: 1.
  • the subframes in the radio frame are all variable subframes; 2.
  • the subframes in the radio frame are all fixed subframes;
  • a subframe in a radio frame has a variable subframe and a fixed subframe.
  • the network side device can determine whether the cell adjacent to the target cell is a strong interference cell according to one of the following manners:
  • the network side device determines, according to the detected signal strength of the cell adjacent to the target cell, whether the cell adjacent to the target cell is a strong interference cell, such as a signal strength and a threshold of a cell adjacent to the target cell. For comparison, if it is greater than the threshold, the cell is considered to be a strong interference cell;
  • the network side device determines, according to the cell identifier corresponding to the strong interference cell reported by the user equipment that belongs to the target cell, whether the cell adjacent to the target cell is a strong interference cell, for example, the user equipment pair may be specified to be in the target cell.
  • the signal strength of the neighboring cell is detected. If the signal strength is greater than the threshold, the cell identifier of the cell is received, and the corresponding network side device uses the corresponding cell as the strong interference cell after receiving the cell identifier;
  • the network side device After receiving the notification information sent by the cell adjacent to the target cell, the network side device determines that the cell is a strong interference cell adjacent to the target cell, where the notification information is that the cell adjacent to the target cell is received.
  • the signal strength sent by the target cell is determined to be transmitted by the strong interference cell of the target cell.
  • the neighboring cell can measure the signal of the victim cell. If the path loss is small, it considers itself to be a strong interference of the cell. The cell then passes through the signaling of the network interface to the cell.
  • embodiments of the present invention are not limited to the foregoing three modes, and other embodiments capable of determining whether a cell adjacent to the target cell is a strong interference cell are also applicable to the embodiment of the present invention.
  • the network side device may obtain the subframe configuration information of the strong interference cell adjacent to the target cell by using the interface signaling, or may independently detect the subframe configuration information of the strong interference cell adjacent to the target cell. Certainly, the manner in which the sub-frame configuration information can be obtained is also applicable to the embodiment of the present invention, for example, after the user equipment obtains the network side device.
  • the network side device may select a subframe in one of the following manners:
  • Each measurement period selects a subframe from the set of subframes in turn, that is, selects one subframe for measurement in each measurement period, However, different subframes in the subframe set are alternately selected for measurement in successive measurement periods, so that the variance can be reduced.
  • embodiments of the present invention are not limited to the foregoing three manners, and other embodiments capable of selecting subframes from a set are also applicable to the embodiments of the present invention.
  • the subframe transmission direction that needs to be scheduled may be uplink or downlink, and is separately introduced below.
  • Case 1 The subframe to be scheduled is a downlink subframe.
  • the network side device divides the fixed subframe in which the transmission direction is downlink or contains the downlink pilot time slot in the target cell in the first set, and the transmission direction in the target cell is downlink.
  • the sub-frames are divided into at least one set.
  • all the downlink subframes in one radio frame are divided into two types, one is a subframe in which the neighboring area is fixed in a fixed direction, and the other is a direction in which the neighboring area may be changed.
  • the neighboring area is configured with a fixed subframe, for example, subframes 0, 1, 2, 5, and 6 in each radio frame, where subframes 0, 1, 5, and 6 are fixed as downlink subframes (or contain downlink guides).
  • Subframe 2 of the frequency slot) subframe 2 is fixed as an uplink subframe.
  • Subframes 0, 1, 5, and 6 since the neighboring interference is the downlink interference from the base station, it can be considered that the interference received by the base station in these subframes is substantially equal, so the downlink will be downlink.
  • Subframes 0, 1, 5, and 6 form a first set as a CSI measurement set; then, the variable subframes whose transmission direction is downlink in the target cell are divided into at least one set, for example, in each radio frame.
  • Subframes 3, 4, 7, 8, and 9 are variable sub-frames, and the number of sets of sub-frames 3, 4, 7, 8, and 9 is not greater than that of sub-frames 3, 4, 7, 8, and 9. The number of subframes.
  • the network side device can divide the variable subframe into two types of variable subframes, and the first type of variable subframe is a variable subframe in which the transmission direction is downlink in the strong interference cell, and the second type A variable subframe is a variable subframe in which a transmission direction is uplink in a part or all of a strong interference cell.
  • the network side device divides the first type of variable subframe into the first set; and divides the second type of variable subframe into at least one set, wherein the second type in each of the divided sets is variable
  • the transmission direction of the subframe in each strong-interference cell is the same.
  • the subframe and the subframes 0, 1, 5, and 6 can be classified into the same downlink subframe set, for example, Be the first collection;
  • the target cell is configured as a subframe 5; there are two strong interference neighbors, and the time slot configurations are configuration 1 and configuration 2, respectively. As shown in Table 1:
  • Table 1 subframes 0, 1, 5, and 6 are fixed subframes whose transmission direction is downlink or contains downlink pilot time slots in the target cell; subframes 3, 4, 7, 8, and 9 are transmission directions in the target cell. Is a downlink variable subframe, and the transmission direction of the subframe 9 in the interference cell 1 and the interference cell 2 is downlink, so the subframe 9 is the first type of variable subframe, and the subframe 9 is placed in the first set. In the first set, the first set includes subframes 0, 1, 5, 6, and 9.
  • Subframes 3, 4, 7, and 8 are variable subframes whose transmission direction is uplink in some or all strong interference cells, and the corresponding transmission direction combinations in the interference cell 1 and the 4th cell are respectively: U, D), (D, D), (U, U), (U, D;).
  • subframe 3 and subframe 8 are both (U, D) in the transmission direction combination of the interference cell 1 and the interference cell 2, the subframe 3 and the subframe 8 are divided into one set, and the subframe 4 is divided into one. In the set, sub-frame 7 is divided into a set.
  • the network side device can also adjust the divided set.
  • the step 201 and the step 202 may further include:
  • Step S1 The network side device selects one subframe configuration from each set to perform CSI measurement and reporting on the user equipment.
  • Step S2 The network side device adjusts the subframe in the set according to the received measurement result.
  • the network side device selects a subframe from each of the adjusted subframe sets.
  • the manner in which the network side device selects the subframe in the step S1 is the same as the manner in which the network side device selects the subframe in the step S1, and details are not described herein again.
  • the network side device may further perform group adjustment on the subframe according to the result of the CSI feedback.
  • the network side device initially configures each subframe set of the UE in each adaptive period, and each of the selected subframes performs CSI measurement reporting.
  • the network side device may perform the judgment according to the measurement result. Thereby determining a downlink subframe CSI measurement packet. Specifically, the corresponding decision threshold may be obtained by agreement, or by simulation, actual measurement, and the like.
  • the CSI includes a channel shield indicator channel quality indicator (CQI) information.
  • CQI channel shield indicator channel quality indicator
  • the network side device obtains multiple CQI information after obtaining the CQI information corresponding to each selected subframe.
  • MCS Modulation and Coding Scheme
  • the subframes corresponding to the multiple CQI information are adjusted to the same set.
  • the two CQIs are classified into the same subframe set.
  • the subframe may be divided according to the size of the interference (or interference plus noise) measured by the network side device, if the interference size measured by the two subframes falls within a given interference.
  • the intensity range the two sub-frames are grouped into the same sub-frame set. If the sub-frames with different interference sizes measured by the two sub-frames are classified into different sub-frame sets, the interference intensity range may be Agreement agreement, or through simulation, actual measurement and other means.
  • the network side device configures the user equipment to perform CSI measurement and reporting on each selected subframe.
  • the network side device receives the CSI corresponding to the selected subframe reported by the user equipment, And scheduling all subframes in the set to which the corresponding subframe belongs according to the received CSI.
  • the network side device configures the user equipment to perform CSI measurement feedback in one or more downlink subframe sets, and configures independent CSI feedback parameters (such as feedback period and subframe position) for each downlink subframe set.
  • the user equipment performs independent CSI measurement and feedback in one or more sets according to the parameter configuration of the network side device.
  • the network side device when the user equipment needs to measure and feed back CSI for multiple sets, the network side device needs to ensure that the measurement and feedback of each set do not conflict with each other in resources.
  • the network side device obtains one or more CSIs, corresponding to one or more downlink subframe sets (including downlink subframes and/or subframes containing special time slots).
  • the network side device uses the obtained CSI to schedule the downlink subframes in the corresponding downlink subframe set, that is, allocate resources to the user equipment according to the reporting result of the user equipment, and the user equipments are independent of each other.
  • Case 2 The subframe to be scheduled is an uplink subframe.
  • the network side device divides the fixed subframe in which the transmission direction is the uplink in the target cell into the second set, and divides the variable subframe in which the transmission direction is the uplink in the target cell into at least one In the collection.
  • all the uplink subframes in one radio frame are divided into two types, one is a subframe in which the neighboring area is fixed in a fixed direction, and the other is a direction in which the neighboring area may be changed.
  • the neighboring area is configured with a fixed subframe, for example, subframes 0, 1, 2, 5, and 6 in each radio frame, where subframes 0, 1, 5, and 6 are fixed as downlink subframes (or include downlink guides).
  • Subframe 2 of the frequency slot) subframe 2 is fixed as an uplink subframe.
  • the neighboring interference is the uplink interference from the base station, it can be considered that the interference received by the base station in these subframes is substantially equal, so the uplink will be uplinked.
  • Subframe 2 constitutes a first set as a CSI measurement set; then, the variable subframe whose transmission direction is uplink in the target cell is divided into at least one set, for example, subframes 3, 4 in each radio frame, 7, 8, and 9 are variable sub-frames, and the number of sets divided into subframes 3, 4, 7, 8, and 9 is not greater than the number of uplink subframes in subframes 3, 4, 7, 8, and 9.
  • the network side device can divide the variable subframe into two types of variable subframes, and the third type of variable subframe is a variable subframe in which the transmission direction is uplink in the strong interference cell, and the fourth type Variable subframes are transmitted in some or all strong interfering cells
  • the direction is a variable sub-frame of the downlink.
  • the network side device divides the third type of variable subframe into the second set; and divides the fourth type of variable subframe into at least one set, wherein the fourth type in each of the divided sets is variable
  • the subframes have the same transmission direction in each strong-interference cell.
  • the subframe and the subframe 2 may be classified into the same downlink subframe set, for example, become the second set;
  • Subframe 2 is a fixed subframe in which the transmission direction is uplink in the target cell
  • the subframes 3, 4, 7, and 8 are variable subframes whose transmission direction is uplink in the target cell, and the transmission direction of the subframe 7 in the interference cell 1 and the interference cell 2 is uplink, so the subframe 7 is the first A type of variable subframe, in which the subframe 7 is placed in the second set, the second set includes the subframes 2, 7.
  • the subframes 3, 4, and 8 are variable subframes whose transmission direction is downlink in some or all of the strong-interference cells, and the corresponding transmission direction combinations in the interference cell 1 and the 4th cell 2 are respectively: (U, D), (D, D), (U, D;).
  • subframe 3 and subframe 8 are both (U, D) in the transmission direction combination of the interference cell 1 and the interference cell 2, the subframe 3 and the subframe 8 are divided into one set, and the subframe 4 is divided into one. In the collection.
  • the network side device can also adjust the divided set.
  • the step 201 and the step 202 may further include:
  • Step A1 The network side device selects one subframe configuration from each set to send the uplink signal to the user equipment (for example, configuring the user equipment to send a Sounding Reference Signal (SRS));
  • SRS Sounding Reference Signal
  • Step A2 The network side device performs CSI measurement according to the received uplink signal, and adjusts the subframe in the set according to the measurement result.
  • the network side device selects a subframe from each of the adjusted subframe sets.
  • the manner in which the network side device selects the subframe in step A1 and the network side device selects the subframe in step 202 The same way, no longer repeat here.
  • the network side device may further perform group adjustment on the subframe according to the result of the CSI feedback.
  • the network side device initially configures each subframe set of the UE in each adaptive period, and each of the selected one subframes sends an uplink signal.
  • the network side device may perform CSI according to the received uplink signal. The measurement is performed according to the measurement result, thereby determining the downlink subframe CSI measurement packet.
  • the specific corresponding decision threshold may be obtained by agreement, or by simulation, actual measurement, and the like.
  • the CSI includes channel shield indication CQI information.
  • the network side device After obtaining the CQI information corresponding to each selected subframe, the network side device has a plurality of CQI information corresponding to the same MCS level. Within the range, the subframes corresponding to the multiple CQI information are adjusted to the same set.
  • the link interface curve given by the link simulation can be queried. If the values of the two CQIs fall within the range of the SNR corresponding to the same MCS level, the two CQIs are classified into the same sub- In the frame collection.
  • the network side device configures the user equipment to send an uplink signal by using each selected subframe (for example, configuring the user equipment to send the SRS); correspondingly, in step 203, the network side device is configured according to the received user equipment.
  • the uplink signal is subjected to CSI measurement, and the CSI corresponding to the selected subframe is obtained, and all subframes in the set to which the corresponding subframe belongs are scheduled according to the received CSI.
  • the network side device configures the user equipment to send an uplink signal in one or more uplink subframe sets, and configures independent parameters for each uplink subframe set; the user equipment configures according to parameters of the network side device, The uplink signal is transmitted on an uplink subframe in one or more sets.
  • the network side device obtains one or more CSIs, corresponding to one or more uplink subframe sets.
  • the obtained CSI is used by the network side device to schedule the uplink subframe in the corresponding uplink subframe set, that is, the resource is allocated to the user equipment according to the reporting result of the user equipment, and the user equipments are independent of each other.
  • the CSI measurement and feedback subframes may be grouped and configured as above. Update.
  • the network side device in the embodiment of the present invention may be a station (such as a macro base station, a home base station, etc.), an RN (relay) device, or other network side devices.
  • a station such as a macro base station, a home base station, etc.
  • RN relay
  • Case 1 In Table 1, for example, the base station is configured for subframe 5; there are two strong interference neighbors, and the time slot configurations are configuration 1 and configuration 2. Specific steps are as follows:
  • the base station divides the subframes 0, 1, 5, and 6 into a set of subframes 0 (ie, the first set); the combinations of the interference directions of the subframes 3, 4, 7, 8, and 9 are: (U, D), (D, D), (U, U), (U, D), (D, D), then subframe 4 and subframe 9 are returned to subframe set 0; subframe 3 and subframe 8 constitute subframe set 1, Subframe 7 constitutes a sub-frame set 2.
  • the base station configures the user equipment to measure and report the downlink subframe with the smallest subframe number in the downlink subframe set: In subframe set 0, subframe 0 is selected to perform CQI measurement, and CQI 0 is obtained. In subframe set 1, subframe 3 is selected for CQI measurement, and CQ ⁇ is obtained, and subframe is selected in subframe set 2. 7 Perform CQI measurement on the top 4 to obtain CQI 2 .
  • the base station queries the link interface curve given by the link simulation to adjust the above set, assuming that C (?/. and (3 ⁇ 4?/ 2 values fall within the range of the signal-to-noise ratio corresponding to the same downlink MCS level, Then, the subframe sets corresponding to the two CQIs are merged, that is, the subframe 7 is returned to the subframe set 0; the final 9 downlink subframes are divided into 2 subframe sets: sub- ⁇ 0, 1, 4, 5, 6, 7 , 9 constitutes a set of subframes 0, and subframes 3 and 8 constitute a set of subframes 1.
  • the base station configures the user equipment to select the subframe 0 in the subframe set 0 to perform the CQI measurement report, and obtains the CQI 0 , and selects the subframe 3 in the subframe set 1 to perform the CQI measurement.
  • the base station schedules all subframes in the subframe set 0 with the C3 ⁇ 4/ Q value, and schedules all subframes in the subframe set 1 with values.
  • Case 2 Taking Table 2 as an example, the base station is configured for subframe 6; there are two strong interference neighbors, and the time slot configurations are configuration 1 and configuration 2. Specific steps are as follows:
  • the base station divides the subframe 2 into a subframe set 0 (ie, the second set); the interference directions of the subframes 3, 4, 7, and 8 are respectively: (U, D), (D, D), (U , U), (U, D), then the subframe 7 is returned to the subframe set 0; the subframe 3 and the subframe 8 constitute the subframe set 1, and the subframe 4 constitutes the subframe set 2.
  • the base station schedules the user equipment to send an uplink signal on the subframe with the smallest number in each uplink subframe set (assumed to be
  • SRS used to measure uplink CSI on each uplink subframe set: select subframe 2 in subframe set 0 to send SRS, measure CQI Q , select subframe 3 in subframe set 1 to send SRS, and measure, in In the subframe set 2, the selected subframe 4 transmits the SRS, and the measurement obtains CQ ⁇ .
  • the base station can query the link interface curve given by the link simulation to adjust the above set, assuming. with
  • the subframe sets corresponding to the two CQIs are merged, that is, the subframe 4 is returned to the subframe set 0;
  • the uplink subframe is divided into two subframe sets: subframes 2, 4, and 7 form a subframe set 0, and subframes 3 and 8 constitute a subframe set 1.
  • the base station configures the user equipment to select the subframe 2 in the subframe set 0 to transmit the SRS, and obtains the CQI 0.
  • the subframe 3 is selected to transmit the SRS, and the measurement is obtained.
  • the base station schedules all subframes in the subframe set 0 with the C3 ⁇ 4/ Q value, and schedules all subframes in the subframe set 1 with values.
  • the network side device for scheduling a subframe is also provided in the embodiment of the present invention.
  • the principle of the device is similar to the method for scheduling a subframe. Therefore, the implementation of the device can be implemented by referring to the method. It will not be repeated here.
  • the network side device for scheduling a subframe in the embodiment of the present invention includes: a dividing module 30, a configuration module 31, and a scheduling module 32.
  • a dividing module 30, configured to transmit a subframe transmission direction according to the need and a child of a strong interference cell adjacent to the target cell
  • the frame configuration information divides the subframes in one radio frame into multiple sets, where the radio frame includes a variable subframe and/or a fixed subframe, the variable subframe is a subframe with a variable transmission direction, and the fixed subframe is a transmission. a subframe with a fixed direction;
  • the configuration module 31 is configured to separately select a subframe from each subframe set, and configure the user equipment according to the selected subframe;
  • the scheduling module 32 is configured to obtain channel state information CSI corresponding to the selected subframe, and schedule all subframes in the set to which the corresponding subframe belongs according to the CSI.
  • the subframe to be scheduled is a downlink subframe; the partitioning module 30 divides the fixed subframe in which the transmission direction is downlink or contains the downlink pilot slot in the target cell in the first set, and is to be in the target cell.
  • the variable direction in which the transmission direction is downlink is divided into at least one set.
  • the partitioning module 30 divides the first type of variable subframe into the first set, where the first type of variable subframe is a variable subframe in which the transmission direction is downlink in the strong interference cell;
  • the second type of variable subframe is divided into at least one set, wherein the second type of variable subframe is a variable subframe in which the transmission direction is uplink in some or all strong interference cells, in each of the divided sets.
  • the second type of variable subframes have the same transmission direction in each strong interfering cell.
  • the dividing module 30 selects one subframe configuration from each set to perform CSI measurement and reporting on the user equipment, and adjusts the subframes in the set according to the received measurement result;
  • the configuration module 31 selects a subframe from each of the adjusted sets of subframes.
  • the configuration module 31 configures the user equipment to perform CSI measurement and reporting on each selected subframe.
  • the scheduling module 32 receives the CSI corresponding to the selected subframe reported by the user equipment.
  • the subframe to be scheduled is an uplink subframe; the partitioning module 30 divides the fixed subframe in which the transmission direction is uplink in the target cell into the second set, and the variable direction in the target cell is uplink. Subframes are divided into at least one set.
  • the partitioning module 30 divides the third type of variable subframe into the first set, where the third type of variable subframe is a variable subframe in which the transmission direction is uplink in the strong interfering cell;
  • the fourth type of variable subframe is divided into at least one set, wherein the fourth type of variable subframe is a variable subframe in which the transmission direction is downlink in some or all of the strong interference cells, in each of the divided sets.
  • the fourth type of variable subframes have the same transmission direction in each strong-interference cell.
  • the dividing module 30 selects one subframe configuration from each set to send uplink signal to the user equipment; performs CSI measurement according to the received uplink signal, and adjusts the subframe in the set according to the measurement result;
  • the configuration module 31 selects a subframe from each of the adjusted sets of subframes.
  • the configuration module 31 configures the user equipment to send an uplink signal through each selected subframe
  • the scheduling module 32 performs CSI measurement according to the received uplink signal of the user equipment, and obtains the CSI corresponding to the selected subframe.
  • the CSI includes the channel shield quantity indicating CQI information; after the CQI information corresponding to each selected subframe is obtained by the dividing module 30, if multiple CQI information is within the SNR range corresponding to the same MCS level, Multiple CQI The subframe corresponding to the information is adjusted to the same set.
  • the partitioning module 30 selects the subframe in one of the following ways:
  • Each measurement period selects a subframe from the set of subframes in turn.
  • the dividing module 30 determines whether the cell adjacent to the target cell is a strong cell according to one of the following ways:
  • the notification information sent by the cell adjacent to the target cell After receiving the notification information sent by the cell adjacent to the target cell, determining that the cell is a strong interference cell adjacent to the target cell, where the notification information is sent by the cell adjacent to the target cell according to the received target cell.
  • the signal strength is determined to be sent after the strong interfering cell of the target cell.
  • the network side device in the embodiment of the present invention may be a station (such as a macro base station, a home base station, etc.), an RN (relay) device, or other network side devices.
  • a station such as a macro base station, a home base station, etc.
  • RN relay
  • 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 can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • 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 the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that the computer Or performing a series of operational steps on other programmable devices to produce computer-implemented processing such that instructions executed on a computer or other programmable device are provided for implementing a block in a flow or a flow and/or block diagram of the flowchart Or the steps of the function specified in multiple boxes.
  • the embodiment of the present invention divides the subframes in one radio frame into multiple sets according to the subframe transmission direction that needs to be scheduled and the subframe configuration information of the strong interfering cell adjacent to the target cell, and then separately from each subframe set. Selecting a sub-frame, and scheduling all the subframes in the set to which the corresponding sub-frame belongs according to the CSI corresponding to the obtained selected sub-frame, thereby dynamically reflecting the change of the interference, and improving the change of the interference System performance and CSI measurement accuracy.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de cette demande portent sur le domaine technique des communications sans fil, et en particulier sur un procédé et un dispositif de planification d'une sous-trame, qui sont utilisés pour résoudre le problème existant dans l'état antérieur de la technique selon lequel, pour une sous-trame TDD à configuration dynamique, le mécanisme de mesure de CSI courant ne peut pas refléter une modification du brouillage et provoque donc facilement une détérioration des performances du système. Le procédé selon un mode de réalisation de la demande comprend les opérations suivantes : un dispositif côté réseau, conformément à une direction de transmission d'une sous-trame devant être planifiée et à des informations de configuration de sous-trame d'une cellule à fort brouillage adjacente à une cellule cible, divise des sous-trames dans une trame radio en une pluralité d'ensembles; le dispositif côté réseau sélectionne une sous-trame dans chaque ensemble de sous-trames séparément, et configure un équipement utilisateur conformément à la sous-trame sélectionnée; et le dispositif côté réseau obtient un CSI correspondant à la sous-trame sélectionnée, et planifie toutes les sous-trames d'un ensemble auquel appartient la sous-trame correspondante conformément au CSI. Les modes de réalisation de cette demande peuvent refléter une modification de brouillage pour la sous-trame TDD à configuration dynamique, ce qui améliore les performances du système et le taux de précision de mesure de CSI.
PCT/CN2012/078835 2011-08-02 2012-07-18 Procédé et dispositif de planification de sous-trame WO2013017016A1 (fr)

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