WO2014154107A1 - Procédé de gestion de groupement pour interférences mutuelles de tdd et station de base - Google Patents

Procédé de gestion de groupement pour interférences mutuelles de tdd et station de base Download PDF

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Publication number
WO2014154107A1
WO2014154107A1 PCT/CN2014/073730 CN2014073730W WO2014154107A1 WO 2014154107 A1 WO2014154107 A1 WO 2014154107A1 CN 2014073730 W CN2014073730 W CN 2014073730W WO 2014154107 A1 WO2014154107 A1 WO 2014154107A1
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Prior art keywords
interference
cell
cells
base station
same group
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PCT/CN2014/073730
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English (en)
Chinese (zh)
Inventor
张晨璐
刘峰
高阳
董贤东
曹一卿
Original Assignee
东莞宇龙通信科技有限公司
宇龙计算机通信科技(深圳)有限公司
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Publication of WO2014154107A1 publication Critical patent/WO2014154107A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a packet management method for TDD cross interference and a base station. Background technique
  • the new generation of wireless communication technology has developed rapidly. Compared with the third generation of wireless communication technology, the new generation of mobile communication technology has many advantages such as network architecture, small signal delay, high communication quality and fast speed.
  • the new generation mobile communication technology can be divided into TDD (Time Division Duplex) system and FDD (Frequency Division Duplex) system.
  • TDD Time Division Duplex
  • FDD Frequency Division Duplex
  • the TDD system is more efficient in utilizing system resources.
  • the base station can use different radio frame structures of different uplink and downlink subframe ratios between base stations according to different uplink and downlink traffic.
  • the existing TDD technology limits the flexible deployment of the downlink subframe ratio configuration on the TDD system.
  • the base station 1 serves the terminal 1
  • the base station 2 serves the terminal 2
  • the base station 1 currently uses the downlink subframe 102 and the base station 2 currently uses the uplink subframe 104, except for the base station 1 and the terminal 1, the base station 2, the normal signal 2 between the terminal 2, and the interference signal 1 caused by different uplink and downlink configurations between the terminal 1 and the terminal 2, and between the base station 1 and the base station 2, that is, cross interference.
  • the International Organization for Standardization (3GPP) launched the eMTA project (Additional enhancements to LTE Time Division Duplex (TDD) for Downlink-Uplink Interference Management and Traffic Adaptation) in May 2010, and researched the new version of UE (User Equipment, User). Equipment) How to implement service adaptation and interference management of the TDD system under the condition of hybrid networking with the old version of the UE, where the new version of the UE refers to the user terminal supporting the R12 (12th edition protocol) and subsequent protocol versions of the 3GPP, and the old version UE refers to the user end of the pre-R12 version protocols (such as R10, R11, etc.) that support 3GPP. End.
  • the new version of the UE refers to the user terminal supporting the R12 (12th edition protocol) and subsequent protocol versions of the 3GPP
  • the old version UE refers to the user end of the pre-R12 version protocols (such as R10, R11, etc.) that support 3GPP. End.
  • CCIM Cell Cluster Interference Mitigation
  • the scheme dynamically processes the cells according to the transmission loss or interference level between the base stations.
  • Cells with low transmission loss or high inter-cell interference levels are grouped into one group; base stations with large transmission loss or small inter-cell interference levels are classified into different groups. All the base stations in the group must be configured with the same TDD uplink-downlink subframe ratio configuration to avoid strong cross-interference.
  • Different groups can be configured with different TDD uplink-downlink subframe ratio configurations to adaptively uplink and downlink traffic load conditions. As shown in FIG.
  • the packet 306 and the packet 308 must be configured to the same TDD configuration, and the packet 304, the packet Between the 306 and the packet 308, different TDD uplink and downlink subframe ratio configurations can be configured.
  • the CCIM scheme gives a valid TDD dynamic subframe proportional configuration interference avoidance method.
  • the present invention is based on the above problems, and proposes a new technical solution, which can use some cells to isolate and re-group other cells in the same group, thereby supporting the re-grouping.
  • the cells in the same group use different TDD uplink and downlink subframe ratios for data transmission, and effectively control cross interference.
  • the present invention provides a packet management method for TDD cross interference, which includes: grouping multiple cells by using a packet-based interference coordination technique, and performing the following steps on multiple cells belonging to the same group: A) Selecting at least one interfering isolated cell from the plurality of cells in the same group; B) controlling the at least one interfering isolated cell to isolate the remaining ones of the plurality of cells in the same group to The cell is divided into a plurality of groups, and each of the groups includes at least one cell; wherein, the plurality of the groups adopt the same or different TDD uplink and downlink subframe proportion configuration parameters.
  • the step of selecting at least one interference isolation cell from the multiple cells of the same group includes: acquiring an interference situation between base stations in the multiple cells in the same group; Establishing a cell interference topology structure corresponding to the interference situation, and selecting the at least one interference isolation cell based on the cell interference topology structure.
  • the interference relationship between the multiple cells can be clearly determined according to the cell interference topology, so that the cell in which the remaining cells can be isolated is selected as the interference isolated cell.
  • the topology structure is only a specific form of relationship expression. Obviously, it can also be used to express the interference relationship between multiple cells by other means, such as forms, connections, and the like.
  • the step of acquiring the interference situation between the base stations in the multiple cells in the same group includes: calculating the same according to a propagation model of the multiple cells in the same group Coupling loss between base stations in a plurality of cells of the group as the interference condition; or obtaining the above according to the received cross-interference measurement between the base stations in the plurality of cells of the same group The cross-interference situation between the base stations in the same group and/or the cross-interference situation between the terminals in the above-mentioned cells as the interference situation.
  • the propagation model and theoretical calculation can be established at the initial stage of deployment, that is, the root According to the calculated coupling loss between the cell base stations, the interference situation is determined, and the process may have a certain deviation from the description of the interference environment.
  • the solution realizes the single order, and only needs to complete the "key cell" selection through one-time measurement calculation in the initial stage of deployment. No need for later adjustments.
  • the cross-interference measurement is performed in the field to determine the interference condition according to the measurement result. This situation is slightly more complicated than the former case, but the interference environment includes the eNB (base station) to the eNB.
  • the cross interference or / and the UE (user equipment, equivalent to the terminal) cross interference to the UE, so the described interference environment is more accurate.
  • the method further includes: determining, according to the cell interference topology structure, an interference relationship between each of the cells and other cells; and one of the cells having the largest number of interference relationships or A plurality of the isolated cells are used as the interference.
  • statistics can be made by the number of relationships in which each cell has interference with other cells, and it is used as a criterion for judging whether or not it is selected as an interference isolation cell.
  • the base station or other device can automatically select the interference isolation cell; of course, the user can manually select the interference isolation cell according to the specified standard.
  • the base station or other equipment can compare and analyze the results of the automatic selection with the results manually selected by the user, thereby continuously correcting the above criteria, in order to achieve a more accurate and more suitable cell selection scheme.
  • the step of isolating the remaining ones of the multiple cells in the same group by the at least one interference isolation cell includes: statically configuring the TDD uplink and downlink used by the at least one interference isolation cell
  • the subframe ratio configuration parameter is configured to perform data transmission using only the subframe of the specified location; wherein each subframe of the specified location has the same data transmission direction in all radio frame structures defined in the TDD system .
  • a plurality of radio frame structures are defined in the TDD system, which includes 0 to 9 subframes in total, and in the different radio frame structures, the foregoing 10 subframes may be uplink subframes, downlink subframes, or special.
  • Subframe but in the already defined #0 ⁇ #6 total 7 seed frame configuration parameters, the subframes with the sequence numbers 0, 1, 2, 5, and 6 are the same (where, for the subframe with sequence number 6) , in #0 ⁇ #2, #6 is a special subframe, in #3 ⁇ #5 is a downlink subframe, but since the special subframe can be used for downlink data transmission in any configuration, but only in In some configurations, uplink data transmission is allowed, so special subframes can be regarded as downlink subframes, and thus the interference is isolated by the cell. It is configured to use only those subframes with the same transmission direction for data transmission so as not to cause cross interference with cells in other groups.
  • the step of isolating the remaining ones of the multiple cells in the same group by the at least one interference isolation cell includes: dynamically configuring the TDD uplink and downlink used by the at least one interference isolation cell a subframe ratio configuration parameter; comparing a TDD uplink and downlink subframe ratio configuration parameter used by each of the at least one interference isolation cell and each of the groups; wherein, if the subframe of the specified location is used by the at least one interference isolation cell and at least One of the groups is used for different data transmission directions, and the at least one interference isolation cell is configured to disable the subframe of the specified location.
  • the uplink and downlink subframe proportion configuration parameters of the interference isolation cell are dynamically configured to make it more conform to the actual requirements of the interference isolation cell; and at the same time, by restricting interference to the subframe used by the isolated cell, for example, when a certain group uses #1 subframe configuration, when the interference isolation cell uses #2 subframe configuration, the interference isolation cell will be disabled with subframes of sequence numbers 3 and 8, to ensure that the cells in the above group are protected from cross interference, but other groups
  • the uplink and downlink subframe proportion configuration parameters can be dynamically configured arbitrarily.
  • the step of the at least one interference isolation cell isolating the remaining ones of the multiple cells in the same group includes:
  • the at least one interfering isolated cell Reducing coverage of the at least one interfering isolated cell, such that a coverage dead zone is formed between the at least one interfering isolated cell and all neighboring cells, or a repeated coverage area between the at least one interfering isolated cell and all neighboring cells
  • the cross-interference strength in the medium is not greater than the preset interference intensity threshold, or the served terminal is not present in the repeated coverage area.
  • the "isolation band" is artificially constructed, so that multiple groups are physically separated to avoid cross interference.
  • the cross-interference of the repeated coverage area is small or there is no serviced terminal, it is obvious that the influence of cross-interference on the terminal can also be avoided. It should be noted that although the coverage of the interfering isolated cell is reduced or turned off, since the communication system uses the dynamic configuration of the base station and the macro base station hybrid network, the signal coverage of the terminal is not affected.
  • the reducing the at least one interference isolation cell includes at least one of the following or a combination thereof: adjusting signal transmit power of the base station in the at least one interfering isolated cell, adjusting an antenna height of the base station, and adjusting an antenna downtilt of the base station.
  • a base station comprising: a processing unit, grouping a plurality of cells by using a packet-based interference coordination technology, and selecting at least one interference isolation from a plurality of cells belonging to the same group a data exchange unit, configured to send isolation control signaling to the at least one interference isolation cell, thereby controlling the at least one interference isolation cell to isolate the remaining ones of the multiple cells in the same group, to The remaining cells are divided into multiple groups, and each of the groups includes at least one cell; wherein, the plurality of the groups adopt the same or different TDD uplink and downlink subframe proportion configuration parameters.
  • the processing unit further acquires an interference situation between the base stations in the multiple cells in the same group, establish a cell interference topology structure corresponding to the interference situation, and
  • the cell interference topology structure selects the at least one interference isolated cell.
  • the interference relationship between the multiple cells can be clearly determined according to the cell interference topology, so that the cell in which the remaining cells can be isolated is selected as the interference isolation cell.
  • the topology structure is only a specific form of relationship expression. Obviously, it can also be used to express interference relationships between multiple cells in other ways, such as forms, connections, and the like.
  • the processing unit calculates, according to a propagation model of the multiple cells of the same group, a coupling loss between the base stations in the multiple cells in the same group, as the Interference condition; or the data interaction unit receives a result of cross interference measurement between base stations in the plurality of cells in the same group; and the processing unit acquires the same group according to the result of the cross interference measurement
  • the cross-interference situation between the base stations in the base station and/or the cross-interference situation between the terminals in the above-mentioned cells as the interference situation.
  • the propagation model and theoretical calculation can be established at the initial stage of deployment, and the interference situation can be determined according to the calculated coupling loss between the cell base stations, and the process has a certain deviation from the description of the interference environment, but
  • the solution realizes the single order, and only needs to complete the "key cell" selection by one-time measurement calculation in the initial stage of deployment, and does not require post-adjustment.
  • cross-interference measurement is performed in the field to determine the interference condition according to the measurement result. This situation is slightly more complicated than the former case, but the interference environment includes cross-interference from eNB to eNB. Or / and UE to UE cross interference, so the described interference environment is more accurate.
  • the processing unit further determines, according to the cell interference topology structure, an interference relationship between each of the cells and other cells, and the cell with the largest number of interference relationships exists.
  • One or more of the interference isolated cells can be made by the number of relationships in which each cell interferes with other cells, and it is used as a criterion for judging whether or not it is selected as an interference isolation cell.
  • the base station or other device can automatically select the interference isolation cell; of course, the user can manually select the interference isolation cell according to the specified standard.
  • the base station or other equipment can compare and analyze the results of the automatic selection with the results manually selected by the user, thereby continuously correcting the above criteria, in order to achieve a more accurate and more suitable cell selection scheme.
  • the isolation control signaling includes static configuration information, where the static configuration information is used to statically configure a TDD uplink and downlink subframe proportional configuration parameter used by the at least one interference isolation cell, so that The data transmission is configured to use only the subframes of the specified location; wherein each of the subframes of the specified location has the same data transmission direction in all radio frame structures defined in the TDD system.
  • a plurality of radio frame structures are defined in the TDD system, which includes a total of 10 subframes from 0 to 9. In different radio frame structures, the foregoing 10 subframes may be uplink subframes, downlink subframes, or special.
  • the isolation control signaling includes dynamic configuration information, where the dynamic configuration information is used to: dynamically configure the at least one interference isolation cell to use
  • the TDD uplink and downlink subframe ratio configuration parameter, and the at least one interference isolation cell is compared with the TDD uplink and downlink subframe ratio configuration parameter used by each of the groups; wherein, if the subframe of the specified location is An interfering isolated cell and at least one of the groups are used for different data transmission directions, and the at least one interfering isolated cell is configured to disable the subframe of the designated location.
  • the uplink and downlink subframe proportion configuration parameters of the interference isolation cell are dynamically configured to make it more conform to the actual requirements of the interference isolation cell; and at the same time, by restricting interference to the subframe used by the isolated cell, for example, when a certain group uses #1 subframe configuration, when the interference isolation cell uses #2 subframe configuration, the interference isolation cell will be disabled with subframes of sequence numbers 3 and 8, to ensure that the cells in the above group are protected from cross interference, but other groups
  • the uplink and downlink subframe proportion configuration parameters can be dynamically configured arbitrarily.
  • the isolation control signaling includes range adjustment information, where the range adjustment information is used to:
  • the cross-interference strength in the area is not greater than the preset interference strength threshold, or the served terminal is not present in the repeated coverage area.
  • the "isolation band" is artificially constructed, so that multiple groups are physically separated to avoid cross interference. Or when the cross-interference of the repeated coverage area is small or there is no serviced terminal, it is obvious that the influence of cross-interference on the terminal can also be avoided. It should be noted that although the coverage of the interference isolation cell is reduced or turned off, since the communication system uses the dynamic configuration of the base station and the macro base station hybrid network, the signal coverage of the terminal is not affected.
  • the range adjustment information is used to control a parameter of adjusting a base station in the at least one interference isolation cell, where the parameter includes at least one of the following or a group thereof And a signal transmission power of the base station, an antenna height of the base station, and an antenna downtilt angle of the base station.
  • the base station is an a macro base station corresponding to the multiple cells, or a designated dynamic configuration base station.
  • the cells in the same group can be isolated and re-grouped by using the partial cell, so that the cells in different groups after the re-grouping use different TDD uplink-downlink subframe ratios for data transmission, and are effective. Control cross interference. DRAWINGS
  • FIG. 1 is a schematic structural view of a TDD system in the related art
  • FIG. 2 is a schematic structural view showing seven radio frames in a TDD system defined in the related art
  • FIG. 3 is a schematic diagram of grouping cells by using a packet-based interference coordination technique in the related art
  • FIG. 4 shows a flow chart of a packet management method for TDD cross interference according to an embodiment of the present invention
  • Figure 5 shows a block diagram of a base station in accordance with an embodiment of the present invention
  • FIG. 6 shows a schematic diagram of group management of a cell according to an embodiment of the present invention
  • FIG. 7 shows a flow chart of dynamically selecting a "key cell” according to an embodiment of the present invention
  • FIG. 8 shows a diagram according to the present invention. Schematic diagram of a cell interference topology structure of an embodiment
  • FIG. 9 shows a flow chart for statically selecting a "key cell” according to an embodiment of the present invention
  • FIG. 10 shows a coverage by narrowing a base station according to an embodiment of the present invention. Range to form a schematic of interference isolation. detailed description
  • FIG. 4 is a flow chart showing a packet management method for TDD cross interference according to an embodiment of the present invention.
  • a packet management method for TDD cross-interference includes: Step 402: Group multiple cells by using a packet-based interference coordination technology; Step 404, for multiple groups belonging to the same group
  • the cells perform the following steps: A) selecting at least one interfering isolated cell from the plurality of cells of the same group; B) controlling the at least one interfering isolated cell to the remaining cells of the plurality of cells in the same group Performing isolation to divide the remaining cells into multiple groups, each of the groups including at least one cell; wherein, the plurality of the groups adopt the same or different TDD uplink and downlink subframe proportion configuration parameters.
  • the step of selecting at least one interference isolation cell from the multiple cells of the same group includes: acquiring an interference situation between base stations in the multiple cells in the same group; Establishing a cell interference topology structure corresponding to the interference situation, and selecting the at least one interference isolation cell based on the cell interference topology structure.
  • the interference relationship between the multiple cells can be clearly determined according to the cell interference topology, so that the cell in which the remaining cells can be isolated is selected as the interference isolated cell.
  • the topology structure is only a specific form of relationship expression. Obviously, it can also be used to express the interference relationship between multiple cells by other means, such as forms, connections, and the like.
  • the step of acquiring the interference situation between the base stations in the multiple cells in the same group includes: calculating the same according to a propagation model of the multiple cells in the same group Coupling loss between base stations in a plurality of cells of the group as the interference condition; or obtaining the above according to the received cross-interference measurement between the base stations in the plurality of cells of the same group Cross-interference between base stations in the same group and/or on The cross-interference between the terminals in the cell is taken as the interference situation.
  • the propagation model and the theoretical calculation can be established at the initial stage of deployment, and the interference situation can be determined according to the calculated coupling loss between the cell base stations, and the process has a certain deviation from the description of the interference environment.
  • the program realizes the single order, and only needs to complete the "key cell" selection by one-time measurement calculation in the initial stage of deployment, and does not require post-adjustment.
  • the cross-interference measurement is performed in the field to determine the interference condition according to the measurement result. This situation is slightly more complicated than the former case, but the interference environment includes the eNB (base station) to the eNB.
  • the cross interference or / and the UE (user equipment, equivalent to the terminal) cross interference to the UE, so the described interference environment is more accurate.
  • the method further includes: determining, according to the cell interference topology structure, an interference relationship between each of the cells and other cells; and one of the cells having the largest number of interference relationships or A plurality of the isolated cells are used as the interference.
  • statistics can be made by the number of relationships in which each cell has interference with other cells, and it is used as a criterion for judging whether or not it is selected as an interference isolation cell.
  • the base station or other device can automatically select the interference isolation cell; of course, the user can manually select the interference isolation cell according to the specified standard.
  • the base station or other equipment can compare and analyze the results of the automatic selection with the results manually selected by the user, thereby continuously correcting the above criteria, in order to achieve a more accurate and more suitable cell selection scheme.
  • the step of isolating the remaining ones of the multiple cells in the same group by the at least one interference isolation cell includes: statically configuring the TDD uplink and downlink used by the at least one interference isolation cell
  • the subframe ratio configuration parameter is configured to perform data transmission using only the subframe of the specified location; wherein each subframe of the specified location has the same data transmission direction in all radio frame structures defined in the TDD system .
  • a plurality of radio frame structures are defined in the TDD system, which includes 0 to 9 subframes in total, and in the different radio frame structures, the foregoing 10 subframes may be uplink subframes, downlink subframes, or special.
  • Subframe but in the already defined #0 ⁇ #6 total 7 seed frame configuration parameters, the subframes with the sequence numbers 0, 1, 2, 5, and 6 are the same (where, for the subframe with sequence number 6) , in #0 ⁇ #2, #6 is a special subframe, in #3 ⁇ #5 is a downlink subframe, but because of the special subframe
  • #6 is a special subframe
  • #3 ⁇ #5 is a downlink subframe, but because of the special subframe
  • it can be used for downlink data transmission, but only allows uplink data transmission in some configurations, so special subframes can be regarded as downlink subframes, and thus the interference isolation cells are configured to use only these transmission directions. Data transmission is performed at the same subframe so that it does not cause cross interference with cells in other groups.
  • the step of isolating the remaining ones of the multiple cells in the same group by the at least one interference isolation cell includes: dynamically configuring the TDD uplink and downlink used by the at least one interference isolation cell a subframe ratio configuration parameter; comparing a TDD uplink and downlink subframe ratio configuration parameter used by each of the at least one interference isolation cell and each of the groups; wherein, if the subframe of the specified location is used by the at least one interference isolation cell and at least One of the groups is used for different data transmission directions, and the at least one interference isolation cell is configured to disable the subframe of the specified location.
  • the uplink and downlink subframe proportion configuration parameters of the interference isolation cell are dynamically configured to make it more conform to the actual requirements of the interference isolation cell; and at the same time, by restricting interference to the subframe used by the isolated cell, for example, when a certain group uses #1 subframe configuration, when the interference isolation cell uses #2 subframe configuration, the interference isolation cell will be disabled with subframes of sequence numbers 3 and 8, to ensure that the cells in the above group are protected from cross interference, but other groups
  • the uplink and downlink subframe proportion configuration parameters can be dynamically configured arbitrarily.
  • the step of the at least one interference isolation cell isolating the remaining ones of the multiple cells in the same group includes:
  • the at least one interfering isolated cell Reducing coverage of the at least one interfering isolated cell, such that a coverage dead zone is formed between the at least one interfering isolated cell and all neighboring cells, or a repeated coverage area between the at least one interfering isolated cell and all neighboring cells
  • the cross-interference strength in the medium is not greater than the preset interference intensity threshold, or the served terminal is not present in the repeated coverage area.
  • the "isolation band" is artificially constructed, so that multiple groups are physically separated to avoid cross interference.
  • the cross-interference of the repeated coverage area is small or there is no serviced terminal, it is obvious that the influence of cross-interference on the terminal can also be avoided. It should be noted that although the coverage of the interfering isolated cell becomes smaller or is closed, since the communication system uses a dynamic configuration of the hybrid base station and the macro base station, the signal coverage of the terminal is not affected. cover.
  • the step of reducing coverage of the at least one interference isolation cell comprises at least one of the following or a combination thereof: adjusting signal transmission power of a base station in the at least one interference isolation cell, Adjusting an antenna height of the base station and adjusting an antenna downtilt angle of the base station.
  • Figure 5 shows a block diagram of a base station in accordance with an embodiment of the present invention.
  • a base station 500 includes: a processing unit 502, grouping a plurality of cells by using a packet-based interference coordination technology, and selecting at least one of a plurality of cells belonging to the same group. Interference-isolated cell; the data interaction unit 504, sends the isolation control signaling to the at least one interfering isolated cell, so as to control the at least one interfering isolated cell to isolate the remaining cells in the same group of the plurality of cells, And dividing the remaining cells into multiple groups, each of the groups including at least one cell; wherein, the plurality of the groups adopt the same or different TDD uplink and downlink subframe proportion configuration parameters.
  • the processing unit 502 further acquires an interference situation between the base stations in the multiple cells in the same group, and establishes a cell interference topology structure corresponding to the interference situation, and is based on the The cell interference topology structure selects the at least one interference isolated cell.
  • the interference relationship between the multiple cells can be clearly determined according to the cell interference topology, so that the cell in which the remaining cells can be isolated is selected as the interference isolation cell.
  • the topology structure is only a specific form of relationship expression. Obviously, it can also be used to express the interference relationship between multiple cells in other ways, such as forms, connections, and the like.
  • the processing unit 502 is configured to calculate, according to a propagation model of the multiple cells of the same group, a coupling loss between the base stations in the multiple cells in the same group.
  • Interference condition; or the data interaction unit 504 receives the same group a result of cross-interference measurement between base stations in another plurality of cells; and the processing unit 502 acquiring, according to the result of the cross-interference measurement, a cross-interference situation between the base stations in the same group and/or in the foregoing cell
  • the cross-interference situation between the terminals is taken as the interference situation.
  • the propagation model and the theoretical calculation can be established at the initial stage of deployment, and the interference situation can be determined according to the calculated coupling loss between the cell base stations, and the process has a certain deviation from the description of the interference environment.
  • the program realizes the single order, and only needs to complete the "key cell" selection by one-time measurement calculation in the initial stage of deployment, and does not require post-adjustment.
  • cross-interference measurement is performed in the field to determine the interference condition according to the measurement result. This situation is slightly more complicated than the former case, but the interference environment includes the cross-drying of the eNB to the eNB. 4 especially or / and UE to UE cross-dry, so the description of the dry environment is more accurate.
  • the processing unit 502 further determines, according to the cell interference topology structure, an interference relationship between each of the cells and other cells, and the cell with the largest number of interference relationships exists.
  • One or more of the ones are used as the interference isolation cell.
  • statistics can be made by the number of relationships in which each cell interferes with other cells, and it is used as a criterion for judging whether or not it is selected as an interference isolation cell.
  • the base station or other device can automatically select the interference isolation cell; of course, the user can manually select the interference isolation cell according to the specified standard.
  • the base station or other equipment can compare and analyze the results of the automatic selection with the results manually selected by the user, thereby continuously correcting the above criteria, in order to achieve a more accurate and more suitable cell selection scheme.
  • the isolation control signaling includes static configuration information, where the static configuration information is used to statically configure a TDD uplink and downlink subframe proportional configuration parameter used by the at least one interference isolation cell, so that The data transmission is configured to use only the subframes of the specified location; wherein each of the subframes of the specified location has the same data transmission direction in all radio frame structures defined in the TDD system.
  • a plurality of radio frame structures are defined in the TDD system, which includes a total of 10 subframes from 0 to 9. In different radio frame structures, the foregoing 10 subframes may be uplink subframes, downlink subframes, or special.
  • Subframe but in the already defined #0 ⁇ #6 total 7 seed frame configuration parameters, the subframes with sequence numbers 0, 1, 2, 5, 6 The same is true (where, for the subframe with sequence number 6, it is a special subframe in #0 ⁇ #2, #6, and a downlink subframe in #3 ⁇ #5, but because of the special subframe, no matter what The configuration can be used for downlink data transmission, but only allows uplink data transmission in some configurations, so special subframes can be regarded as downlink subframes. Therefore, the interference isolation cells are configured to use only the same transmission direction. Data is transmitted at the frame so that it does not interfere with cells in other groups.
  • the isolation control signaling includes dynamic configuration information, where the dynamic configuration information is used to: dynamically configure a TDD uplink and downlink subframe proportion configuration parameter used by the at least one interference isolation cell, and Controlling, by the at least one interfering isolated cell, a TDD uplink and downlink subframe proportion configuration parameter that is used by each of the groups, and wherein the subframe of the specified location is used by the at least one interference isolation cell and at least one of the groups For different data transmission directions, the at least one interference isolation cell is configured to disable the subframe of the specified location.
  • the uplink and downlink subframe proportion configuration parameters of the interference isolation cell are dynamically configured to make it more conform to the actual requirements of the interference isolation cell; and at the same time, by restricting interference to the subframe used by the isolated cell, for example, when a certain group uses #1 subframe configuration, when the interference isolation cell uses #2 subframe configuration, the interference isolation cell will be disabled with subframes of sequence numbers 3 and 8, to ensure that the cells in the above group are protected from cross interference, but other groups
  • the uplink and downlink subframe proportion configuration parameters can be dynamically configured arbitrarily.
  • the isolation control signaling includes range adjustment information, where the range adjustment information is used to:
  • the cross-interference strength in the area is not greater than the preset interference strength threshold, or the served terminal is not present in the repeated coverage area.
  • the "isolation band" is artificially constructed, so that multiple groups are physically separated to avoid cross interference.
  • the cross-interference of the repeated coverage area is small or there is no serviced terminal, it is obvious that the influence of cross-interference on the terminal can also be avoided.
  • the coverage of the interference isolation cell becomes smaller or is closed, since the communication system uses Dynamically configuring the hybrid network between the base station and the macro base station, and thus does not affect the signal coverage of the terminal.
  • the range adjustment information is used to control a parameter for adjusting a base station in the at least one interference isolation cell, where the parameter includes at least one of the following or a combination thereof: a signal transmission power of the base station, The antenna height of the base station and the antenna downtilt angle of the base station.
  • the base station 500 is a macro base station corresponding to the multiple cells, or a designated dynamically configured base station.
  • the currently proposed CCIM technology groups for example, multiple cells in the same macro base station coverage, and different uplink and downlink subframe ratio configuration parameters may be used for cells in different groups;
  • the cells in the packet 308 are dynamically configured. The gain will be greatly suppressed.
  • the present invention proposes a scheme for regrouping cells in an existing packet, which may also be called “group splitting", that is, the original CCIM-based
  • group splitting that is, the original CCIM-based
  • the resulting packets are "split" to get more groups, and each group becomes isolated.
  • These groups can use the same or different uplink and downlink subframe ratio configuration parameters.
  • the present invention needs to solve the following two problems:
  • the specific process includes:
  • Step 702 cross interference measurement and reporting.
  • cross-interference measurement refers to eNB-to-eNB and/or UE-to-UE cross-interference generated between dynamically configured base stations within a dynamic configuration range.
  • the measurement of cross interference can be performed periodically or event triggered.
  • the period of the interference measurement can be consistent with the dynamic configuration period (used to configure the TDD uplink and downlink subframe ratio configuration parameters), or it can be greater or less than the dynamic configuration period.
  • the measurement of cross-interference can also be triggered by an event, such as when the topology of the dynamically configured base station changes (new base station is turned on or the base station is turned off).
  • a threshold value T eNB is set .
  • the reception level is greater than or equal to the threshold T eNB , and the base station B is considered to be strongly cross-interrupted to the base station A.
  • the threshold value T eNB it is considered that the interference can be tolerated.
  • a certain threshold value T UE is set , when the signal sent by any UE to which the base station A belongs is received by any UE to which the base station B belongs, and the receiving level strength is greater than or equal to the threshold value T UE It is considered that there is strong cross interference between the base station B and the base station A; on the contrary, when it is less than the threshold value T UE , it is considered that the cross interference between the base station B and the base station A can be tolerated.
  • a "central control node” may be established, which may specifically be a macro base station corresponding to the cell or a dynamically configured base station in a designated cell, so that the central control node summarizes and analyzes the measurement results from the respective dynamically configured base stations.
  • the information interaction interface such as the X2 interface, may be implemented, for example:
  • the country defines a new information domain in the existing X2 related signaling, such as "eNB Configuration Update” signaling defines a new information field.
  • Step 704 the reconstruction of the interference topology structure and the determination of the "key cell”, that is, determining the "key cell” by establishing an interference topology structure.
  • the central control node obtains the interference relationship list shown in the following table by using all the measurement results received (where 1 represents Celel shown in FIG. 6, and so on):
  • the cell has more interference relationships with other cells; and the cell (or possibly other selected cells) may be selected as a "key cell”.
  • all "key cells” can ensure that the remaining cells are divided into multiple groups. For example, in Figure 8, when the cell No. 3 is selected as the "key cell", the remaining cells are divided into two groups, one group includes cells No. 1 and No. 2, and the other group includes cells No. 4, No. 5 and No. 6. .
  • Step 706 similar to the above process, implements "re-split" of the cells in the original group, and obtains a plurality of new groups.
  • Step 708 Configure a "key cell” to implement interference isolation for the multiple groups.
  • Step 902 At the initial stage of network construction, coupling loss (Coupling Loss) between dynamically configured cells is obtained by model measurement and theoretical calculation.
  • the above coupling loss mainly includes large-scale loss between base stations and antenna feed loss at the transmitting end and the receiving end.
  • the above measurement calculation is completed by the manual calculation and evaluation in the initial stage of network construction. Specifically, a certain threshold value TL is set. Ss , when the coupling loss of the base station A to the base station B is less than the threshold value TL. When ss , it is considered that there is a strong possibility of cross interference between base station A and base station B; when base station A is connected to base station B The loss is greater than the threshold T L . At SS , it is considered that there is no possibility of strong cross interference between base station A and base station B.
  • Step 904 reconstructing the "loss topology” and determining the "key cell” according to the structure.
  • the list of loss relationships obtained according to the manual measurement calculation is shown in Table 1.
  • the reconstructed "loss topology” is shown in Figure 8, so that the "key cell” is determined accordingly.
  • Step 906 According to the determination of the "key cell”, the "re-split" of the remaining cells is implemented, which is similar to the step 706 shown in FIG. 7, and details are not described herein again.
  • Step 908 Configure a "key cell” to implement interference isolation for the multiple groups.
  • the static "key cell” selection only considers the coupling loss between the base stations, and does not consider the impact on the actual interference caused by dynamic factors such as fast decay and human loss; meanwhile, the method only considers the cross interference of the eNB to the eNB, Consider the cross interference of the UE to the UE. Therefore, the static "key cell” selection will have a certain deviation from the description of the interference environment. However, the scheme realizes the single-segment, and only needs to complete the "key cell” selection by one-time measurement calculation in the initial stage of deployment, without the need for later adjustment.
  • the dynamic "key cell” selection uses real-time inter-base station cross-interference measurements to describe the inter-station interference environment, where the interference environment includes cross-interference from the eNB to the eNB or/and cross-interference from the UE to the UE. Therefore, the described interference environment is more accurate than the static “key cell” option. However, this method is more complicated than the static "key cell” selection implementation, and requires cross-interference measurement between base stations as support.
  • the scheme refers to statically configuring a "key cell" into a TDD configuration defined by the protocol, and restricting the user to perform data transmission only in subframes with sequence numbers 0, 1, 2, 5, 6 through scheduling.
  • the subframe is in an idle state.
  • the scheme refers to the TDD uplink and downlink subframe configuration of the "key cell” is also dynamically configured.
  • the scheduling is performed at the subframe of the "key cell” base station. The method prohibits scheduling uplink or downlink data.
  • the TDD uplink and downlink subframe configuration adopted by the "key cell” in "Dynamic Scheduling Limit” can be dynamically changed.
  • the "key cell” sub-frame direction is inconsistent with the neighboring cell, for example, in Figure 6, if the split group A adopts TDD configuration #2, the group B adopts TDD configuration #4, and at this time, the "key cell” Cell4 adopts the TDD configuration. #2, in addition to the subframes with sequence numbers 0, 1, 2, 5, 6, the subframes with sequence numbers 4, 8, and 9 can also be used to schedule downlink user data.
  • the TDD configuration used by the "key cell” can be dynamically adjusted according to its own uplink and downlink traffic load ratio, or it can follow packet A or packet B - the same dynamic change.
  • the "dynamic scheduling limit" of mode 2 is more flexible than the “static scheduling limit” of scheme one, providing more available resources for "key cells". However, due to the need for TDD configuration information used by neighboring cells, additional information interaction is required.
  • the scheme refers to adjusting the coverage of the base station by using the method of downlink power control, base station antenna height or downtilt angle adjustment, thereby achieving the effect of isolating cross interference.
  • the key cell and the group A and the group B are artificially formed to form a coverage gap of the cell base station, thereby forming an interference isolation band. Achieve interference isolation for Group A and Group B.
  • the TDD dynamic configuration is mainly applied to the dynamic configuration of the base station and the macro base station hybrid networking scenario, adjusting the coverage of the "key cell" does not affect the message to the UE. Number coverage.
  • the technical solution of the present invention is described in detail above with reference to the accompanying drawings.
  • the present invention provides a packet management method for TDD cross-interference and a base station, which can use some cells to isolate and re-group other cells in the same group, thereby supporting cell use in different groups after re-grouping.
  • Different TDD uplink and downlink subframe ratios are used for data transmission, and cross interference is effectively controlled.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé de gestion de groupement pour interférences mutuelles de TDD (duplexage par répartition dans le temps) qui consiste à : employer une technologie de coordination d'interférence basée sur le groupement afin de grouper de multiples cellules; et réaliser les étapes suivantes pour de multiples cellules dans le même groupe : A) sélectionner au moins une cellule d'isolement d'interférence parmi les multiples cellules dans le même groupe; B) commander la ou les cellules d'isolement d'interférence pour isoler les autres cellules parmi les multiples cellules dans le même groupe, afin de grouper les autres cellules en de multiples groupes, chaque groupe contenant au moins une cellule; les multiples groupes emploient des paramètres identiques ou différents pour la configuration de proportion de sous-trames de liaison montante et descendante TDD. L'invention concerne également une station de base. La solution technique de la présente invention emploie certaines des cellules pour isoler et regrouper les autres cellules dans le même groupe, ce qui permet aux cellules de groupes différents, après regroupement, d'utiliser des proportions différentes de sous-trames de liaison montante et descendante TDD et de réaliser une gestion efficace des interférences mutuelles.
PCT/CN2014/073730 2013-03-26 2014-03-19 Procédé de gestion de groupement pour interférences mutuelles de tdd et station de base WO2014154107A1 (fr)

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CN104378789B (zh) * 2013-08-16 2019-06-07 索尼公司 无线通信系统中的通信质量确定/获取装置和方法
WO2015027389A1 (fr) * 2013-08-27 2015-03-05 Qualcomm Incorporated Signalisation de liaison terrestre pour l'atténuation des interférences et l'adaptation du trafic
WO2015103733A1 (fr) * 2014-01-07 2015-07-16 Qualcomm Incorporated Renvoi de csi de deux ensembles de sous-trames pour eimta en lte
CN103763707B (zh) * 2014-01-10 2017-04-05 清华大学 一种多基站重复分组方法
CN103763710B (zh) * 2014-01-24 2017-06-06 宇龙计算机通信科技(深圳)有限公司 Tdd交叉干扰的分组管理方法和分组管理系统、基站
WO2015117275A1 (fr) 2014-02-10 2015-08-13 Qualcomm Incorporated Transfert dans des cellules activées de configuration tdd ul/dl dynamique et/ou des cellules comp
CN105101234B (zh) * 2014-05-08 2020-10-02 索尼公司 对时分双工网络中的小小区进行分簇的装置、方法及基站
CN105338543B (zh) * 2014-08-08 2018-09-04 中国移动通信集团公司 网络辅助终端盲检的方法、装置、系统及相关设备
CN105392199B (zh) * 2014-08-12 2019-02-01 华为技术有限公司 时隙配比自适应方法、控制器及基站
CN106535220B (zh) * 2015-09-14 2019-08-23 大唐移动通信设备有限公司 动态tdd子帧配比调整方法及基站、网络管理设备
CN107454672B (zh) 2016-05-31 2020-04-28 华为技术有限公司 一种配置子帧的方法和装置
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CN112237039B (zh) * 2018-06-05 2024-04-05 上海诺基亚贝尔股份有限公司 用于交叉链路干扰测量的资源配置
CN114258036B (zh) * 2020-09-21 2024-03-01 大唐移动通信设备有限公司 一种帧结构配置方法、装置及存储介质
CN114885376B (zh) * 2022-05-30 2024-04-09 中国联合网络通信集团有限公司 一种帧结构配置方法、装置及存储介质

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