WO2012122831A1 - 小区间干扰协调方法及系统 - Google Patents

小区间干扰协调方法及系统 Download PDF

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Publication number
WO2012122831A1
WO2012122831A1 PCT/CN2011/083653 CN2011083653W WO2012122831A1 WO 2012122831 A1 WO2012122831 A1 WO 2012122831A1 CN 2011083653 W CN2011083653 W CN 2011083653W WO 2012122831 A1 WO2012122831 A1 WO 2012122831A1
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cell
rntp threshold
threshold
rntp
oam
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PCT/CN2011/083653
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English (en)
French (fr)
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刘献玲
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中兴通讯股份有限公司
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Publication of WO2012122831A1 publication Critical patent/WO2012122831A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W16/00Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10Dynamic resource partitioning

Definitions

  • TECHNICAL FIELD The present invention relates to the field of communications, and in particular to an inter-cell interference coordination method and system.
  • BACKGROUND Inter-Cell Interference (ICI) is an inherent problem of cellular mobile communication systems.
  • the traditional solution is to use frequency reuse.
  • the future long-term evolution of the broadband mobile communication system (Long-Term Evolution, LTE for short) requires high spectral efficiency, so it is desirable to be as close as possible to the spectrum reuse factor 1.
  • Orthogonal Frequency Division Multiplexing (OFDM) technology better solves the problem of intra-cell interference than Code Division Multiple Access (CDMA) technology, but at the cost of OFDM system The ICI problem is more serious than the CDMA system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the interference between the downlink cells is from the base station of the neighboring cell.
  • the spectrum multiplexing coefficient is 1, any user in the small area will inevitably be interfered by the downlink signal of the neighboring cell, and the user located in the center of the cell has a large scale due to the signal of the neighboring cell.
  • 3GPP LTE Inter-Cell Interference Coordination is mainly used for interference control to reduce interference levels and improve edge user throughput.
  • the basic principle of inter-cell interference coordination is to set certain restrictions on downlink or uplink resource (band or power) management to coordinate the actions of each cell to avoid serious inter-cell interference.
  • FFR partial frequency reuse
  • SFR Soft Frequency Reuse
  • RNTP downlink Narrowband TX Power
  • the present invention provides an inter-cell interference coordination method and system, which at least solves the problem of inter-cell interference coordination according to a fixed bitmap in the related art, and cannot adapt to network load changes.
  • an inter-cell interference coordination method is provided.
  • the inter-cell interference coordination method according to the present invention includes: the first cell statistics the number of user equipments whose subscribers whose QOS is not up to standard or the number of user equipments whose radio links fail; and adjusts the first cell according to the quantity and the preset number threshold.
  • Adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is greater than or equal to the quantity threshold, lowering the first cell and/or The RNTP threshold of the second cell adjacent to the first cell.
  • Reducing the RNTP threshold of the first cell and/or the second cell adjacent to the first cell includes: the first cell determines the reduced RNTP threshold; the first cell uses the reduced RNTP threshold; and the first cell decreases the RNTP bitmap median Transmit power on a physical resource block PRB of zero; the first cell sends a reduced RNTP threshold to the second cell.
  • Reducing the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: the second cell receives the reduced RNTP threshold from the first cell; and the second cell receives the phase from the second cell The RNTP threshold of the neighboring third cell; the second cell determines a lower RNTP threshold among the reduced RNTP threshold and the RNTP threshold from the adjacent third cell; and the second cell determines whether the lower RNTP threshold is smaller than The RNTP threshold currently used by the second cell; if the judgment result is yes, the second cell uses a lower RNTP threshold and reduces the transmit power on the PRB with zero bit in the RNTP bitmap.
  • Adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is zero, improving the first cell and/or the first The RNTP threshold of the second cell adjacent to the cell.
  • Increasing the RNTP threshold of the first cell and/or the second cell adjacent to the first cell includes: determining, by the first cell, an RNTP threshold that is requested to be increased; and transmitting, by the first cell, the RNTP threshold for the operation, management, and maintenance OAM.
  • the raising of the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: the OAM receives the RNTP threshold of the request from the first cell, and the OAM receives the RNTP threshold from the second cell, where The RNTP threshold of the second cell includes one of the following: The second cell requests an increased RNTP threshold, The RNTP threshold currently used by the second cell; the OAM receives the RNTP threshold from the fourth cell adjacent to the first cell, where the RNTP threshold from the fourth cell includes one of the following: the fourth cell requests an increased RNTP threshold, and the fourth The RNTP threshold currently used by the cell; in the case where the neighboring cell of the first cell includes only the second cell and the fourth cell, the OAM is determined to be lower among the RNTP threshold from the second cell and the RNTP threshold from the fourth cell.
  • the RNTP threshold is determined by the OAM.
  • the OAM determines whether the lower RNTP threshold is greater than the RNTP threshold from the first cell. If the judgment result is yes, the OAM notifies the first cell to use the lower RNTP threshold.
  • the method further includes: the first cell uses a lower RNTP threshold; and the first cell increases the transmit power on the PRB with zero bits in the RNTP bitmap.
  • the raising of the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: the OAM receives the RNTP threshold of the request from the first cell, and the OAM receives the RNTP threshold of the request from the second cell.
  • the OAM receives the RNTP threshold from the fifth cell adjacent to the second cell, where the RNTP threshold from the fifth cell includes one of the following: the fifth cell requests an increased RNTP threshold, and the RNTP threshold currently used by the fifth cell; In a case where the neighboring cell of the second cell includes only the first cell and the fifth cell, the OAM determines a lower RNTP threshold among the RNTP threshold of the request from the first cell and the RNTP threshold from the fifth cell; The OAM determines whether the lower RNTP threshold is greater than the RNTP threshold for the request from the second cell. If the determination is yes, the OAM notifies the second cell to use the lower RNTP threshold.
  • the method further includes: the second cell uses a lower RNTP threshold; and the second cell increases the transmit power on the PRB with zero bits in the RNTP bitmap.
  • Adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is less than the quantity threshold and the quantity is not equal to zero, the first cell re-statistics The number of user devices whose own QOS is not up to standard or the number of user devices whose radio link fails.
  • the first cell counts the number of user equipments in the QOS that are not up to standard or the number of user equipments that fail to be the radio link by using one of the following statistics: From the time when the first cell is running, the periodic statistics are performed according to a preset period. Mode: The event statistics method is performed according to a preset period from the time when the RNTP threshold of the first cell is adjusted.
  • an inter-cell interference coordination system is provided.
  • the inter-cell interference coordination system includes a first cell and a second cell adjacent to the first cell, where the first cell includes: a statistics module, configured to count user equipments or wireless chains whose QOS is not up to standard in the statistics The number of user equipments that failed in the road; the adjustment module is configured to adjust the RNTP threshold of the first cell and/or the second cell according to the quantity and the preset number threshold.
  • the RNTP threshold of the neighboring cell is adjusted according to the number of the user equipments that fail to meet the standard QOS or the number of the user equipments that fail the radio link, so that the inter-cell interference coordination can be implemented according to the network load change, thereby optimizing the performance of the cell edge.
  • FIG. 1 is a flowchart of an inter-cell interference coordination method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for inter-cell interference coordination according to a preferred embodiment of the present invention
  • FIG. 3 is a preferred implementation according to the present invention.
  • FIG. 4 is an interaction flow chart according to a preferred embodiment of the present invention
  • FIG. 5 is a flow chart of dividing a frequency band and setting RNTP according to a preferred embodiment 2 and a preferred embodiment 3 of the present invention
  • Figure 6 is an interaction flow chart according to a preferred embodiment 2 of the present invention
  • Figure 7 is an interaction flow chart according to a preferred embodiment 3 of the present invention
  • Figure 8 is a structure of an inter-cell interference coordination system according to an embodiment of the present invention; block diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Step S102 The first cell counts the number of user equipments in the QOS that are not up to standard or the user equipments that fail to be the radio link.
  • Step S104 Adjust the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold.
  • inter-cell interference coordination is performed according to a fixed bitmap, and the network load cannot be adapted.
  • the RNTP threshold of the neighboring cell is adjusted according to the number of the user equipments that fail to meet the standard QOS or the number of the user equipments that fail to be the radio link, so that the inter-cell interference coordination can be implemented according to the network load change, thereby optimizing the performance of the cell edge.
  • the present invention can adjust the RNTP threshold of the neighboring cell by using the existing signaling procedure (for example, through the LOAD INFORMATION message of the X2 interface), so that the existing protocol can be better compatible.
  • the foregoing preset number threshold may be set according to the total number of edge UEs and/or the edge load.
  • adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is greater than or equal to the quantity threshold, lowering the first cell and / or the RNTP threshold of the second cell adjacent to the first cell.
  • reducing the RNTP threshold of the first cell and/or the second cell adjacent to the first cell includes: the first cell determines the reduced RNTP threshold; the first cell uses the reduced RNTP threshold; and the first cell decreases the RNTP The transmit power on the PRB with zero bits in the bitmap; the first cell sends the reduced RNTP threshold to the second cell.
  • the reducing the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: receiving, by the second cell, a reduced RNTP threshold from the first cell; The RNTP threshold of the third cell adjacent to the second cell; the second cell determines a lower RNTP threshold among the reduced RNTP threshold and the RNTP threshold from the adjacent third cell; the second cell determines the lower RNTP Whether the threshold is smaller than the RNTP threshold currently used by the second cell; if the judgment result is yes, the second cell uses a lower RNTP threshold and reduces the transmit power on the PRB with zero bit in the RNTP bitmap.
  • adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is zero, improving the first cell and/or The RNTP threshold of the second cell adjacent to the first cell.
  • the raising the RNTP threshold of the first cell and/or the second cell adjacent to the first cell comprises: determining, by the first cell, an increased RNTP threshold; operating, managing, and maintaining, operating, managing, and maintaining the first cell (Operation Administration and Maintenance, or OAM for short) Sends the RNTP threshold for request enhancement.
  • the raising the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: 0AM receiving the RNTP threshold of the request from the first cell is raised; 0AM receiving the RNTP threshold from the second cell
  • the RNTP threshold from the second cell includes one of the following: the second cell requests an increased RNTP threshold, and the RNTP threshold currently used by the second cell; 0AM receives the RNTP threshold from the fourth cell adjacent to the first cell,
  • the RNTP threshold from the fourth cell includes one of the following: the fourth cell requests an increased RNTP threshold, and the RNTP threshold currently used by the fourth cell; where the neighboring cell of the first cell includes only the second cell and the fourth cell.
  • 0AM determines a lower RNTP threshold from the RNTP threshold from the second cell and the RNTP threshold from the fourth cell; 0AM determines whether the lower RNTP threshold is greater than the requested RNTP threshold from the first cell; The result is yes, then 0AM informs the first cell to use a lower RNTP threshold.
  • the method further includes: the first cell uses a lower RNTP threshold; and the first cell increases the transmit power on the PRB with zero bits in the RNTP bitmap.
  • the raising the RNTP threshold of the first cell and/or the second cell adjacent to the first cell further includes: 0AM receiving the RRN threshold of the request from the first cell is raised; 0AM receiving the request from the second cell is improved.
  • RNTP threshold; 0AM receives the RNTP threshold from the fifth cell adjacent to the second cell, where the RNTP threshold from the fifth cell includes one of the following: the fifth cell requests an increased RNTP threshold, and the fifth cell currently uses RNTP threshold; in the case that the neighboring cell of the second cell includes only the first cell and the fifth cell, 0AM is determined to be lower among the RNTP threshold of the request from the first cell and the RNTP threshold from the fifth cell.
  • the method further includes: the second cell uses a lower RNTP threshold; and the second cell increases the transmit power on the PRB with zero bits in the RNTP bitmap.
  • adjusting the RNTP threshold of the first cell and/or the second cell adjacent to the first cell according to the quantity and the preset number threshold includes: if the quantity is less than the quantity threshold and the quantity is not equal to zero, the first The cell re-counts the number of user equipments in the Q0S that are not up to the standard or the user equipments that have failed in the radio link.
  • the first cell counts the number of user equipments in the QOS that are not up to standard or the number of user equipments that fail in the radio link by using one of the following statistics: Starting from the first cell operation, performing statistics according to a preset period Period statistics mode; The event statistics method is performed according to a preset period from the time when the RNTP threshold of the first cell is adjusted.
  • the statistical manners of the other cells may be similar to the first cell, that is, include one of the following: a periodic statistical manner of performing statistics according to a preset period from the time when the cell is running; When the RNTP threshold of the cell is adjusted, the event statistics method is performed according to a preset period.
  • the method before the first cell counts the number of user equipments in the Q0S that are not up to the standard or the number of user equipments that fail to be the radio link, the method further includes: performing, according to different topologies, all the cells in units of clusters, and the entire downlink system. The bandwidth is divided into two parts, one for the central user and the other for the edge users.
  • the frequency band used by the edge users is to ensure that the adjacent cells are completely staggered.
  • the central user can borrow the frequency resources of the neighboring cell edge users. If borrowed, the central user uses the transmit power to be limited.
  • the method further includes: all cells are corresponding to the RNTP bitmap position on the PRB allocated to the edge user of the local cell, and the opposite is "1".
  • the transmit power on the PRB is unrestricted, allowing transmission at the maximum transmit power, that is, the corresponding P A value can always be allowed to take the maximum value; the corresponding RNTP bitmap on the PRB used by other users is set to "0".
  • the transmit power on the PRB that is set to "0" is limited and can be dynamically adjusted.
  • the dynamic adjustment of the transmit power on the PRB that is set to "0" includes: the initial power is pre-adjusted to be transmitted at full power, that is, P A on the PRB (the power of the PDSCH on the class A symbol is relative to the cell reference signal) The difference in power) The corresponding value is set to the maximum value specified in the protocol.
  • the PRB with the RNTP bitmap bit of the neighboring cell may only be the user of the center of the cell, and the PRB priority scheduling of the RNTP bitmap bit of the neighboring cell is "0".
  • step S202 the maximum allowable initial value of P A on each PRB of all cells is set to the maximum value specified in the protocol.
  • step S204 the statistics T pen are started.
  • the number of UEs with problems in the cell in time d is Num.
  • step S206 it is determined whether Num is greater than or equal to TrdNum. If yes, step S208 is performed; otherwise, step S218 is performed.
  • step S208 the maximum allowed P A is lowered by one step, and the RNTP threshold is also lowered by one step.
  • Step S210 notifying all neighboring cells of a new RNTP threshold.
  • Step S212 After receiving the neighboring cell, extract the minimum value MinTrd of all received RNTP thresholds.
  • Step S214 the neighboring cell determines whether the RNTP threshold used is greater than MinTrd, and if yes, proceeds to step S216, otherwise returns to step S204, that is, the neighboring cell continues to count T pen .
  • the number of UEs with problems in the cell in time d is Num.
  • Step S216 the neighboring cell modifies its own RNTP threshold to MinTrd, and the maximum allowed P A .
  • step S2128 it is determined whether Num is equal to 0. If yes, step S220 is performed; otherwise, returning to step S204, the current cell restarts counting T pen .
  • the number of UEs with problems in the cell in time d is Num.
  • Step S220 sending a request for increasing the RNTP threshold and the target threshold RTrd to the OAM.
  • Step S222 the OAM extracts the minimum value MinReTrd of the RNTP threshold requested by all neighboring cells (if the neighboring cell does not request, the threshold used by the neighboring cell is taken).
  • step S224 it is determined whether the MinReTrd is greater than the RTrd. If yes, the process proceeds to step S226, otherwise, the process proceeds to step S230.
  • Step S226 the OAM notifies the cell to raise the RNTP threshold to MinReTrd.
  • Step S230 the OAM notifies the cell that the RNTP threshold cannot be raised.
  • FIG. 3 is a schematic diagram of dividing a frequency band resource and setting a RNTP bitmap according to a preferred embodiment of the present invention. As shown in FIG. 3, three cells including neighboring cells are included, and the following is a technical solution of cell 1 as a main line. The implementation is described in further detail.
  • the bandwidth of the whole system is divided into four parts, which are divided into PRB units, which may be continuous or discontinuous.
  • the frequency band corresponding to frequency band A is the part that can be used by three cell centers, and B is the edge of cell 1 , C is used at the edge of cell 2, D is used at the edge of cell 3; (2) RINR bitmap is set.
  • the cell 1 center can borrow the frequency bands C and D of the 2 and 3 edges, so the part corresponding to B in the RNTP bitmap of the cell 1 is set to "1", and the other frequency bands are set to "0"; corresponding to the RNTP bitmap of the cell 2
  • the part of C is set to "1”, and the other frequency bands are set to "0”;
  • the part corresponding to D in the RNTP bitmap of cell 3 is set to "1", and the other frequency bands are set to "0”.
  • the initial state of power on the PRBs with all cell RNTP bitmap bits set to "0" allows transmission at the maximum transmit power, ie the maximum allowed P A is initially set to the maximum value specified in the protocol by 3 dB.
  • Each cell dynamically adjusts the power on the PRB whose RNTP bitmap bit is "0".
  • the detailed flow is shown in Figure 4.
  • the cell 1 determines the number of problematic UEs 5>threshold value 3, so the maximum allowed PA-step on the PRB whose bitmap bit is "0" is lowered, and the RNTP threshold value is also lowered by one step, P A is as follows The order is reduced by ⁇ 3, 2, 1, 0, -1.77, -3, -4.77, -6 ⁇ , and the RNTP threshold is reduced by ⁇ 3, 2, 1, 0, -1, -2, -3, -4 in the following order.
  • the post-issue LOAD INFORMATION tells the cell 2 and 3 the new RNTP threshold. If the number of UEs in the cell 2 is found to be between TrdNum and 0, the next statistical period Tperiod is directly triggered to re-statistic, that is, the event is triggered. Statistics: If the cell 3 finds that there is no problem with the UEs it serves, it sends a request to the OAM to increase the RNTP threshold by one step.
  • the RNTP threshold is increased in the following order: ⁇ - ⁇ , -11, -10, -9, -8, -7, -6, -5, -4, -3 , -2, -1, 0, 1, 2, 3 ⁇ , that is, the RNTP threshold is expected to increase to 2 dB.
  • the cells 2 and 3 After receiving the LOAD INFORMATION of the cell 1, the cells 2 and 3 extract the minimum RNTP threshold of all the neighboring cells received, where both cells only receive the RNTP threshold of the cell 1 and the threshold that they are using. Compare. (6.1) The current use of cell 2 and cell 3 is 1, which is greater than the received threshold 0, modify the threshold that is being used by itself to 0, and modify the power on the PRB whose RNTP bitmap bit is "0", that is, the P A value. 2.
  • cells 2 and 3 will schedule the PRB scheduling center user with the cell 1RNTP bitmap bit set to "1" during scheduling, and the PRB with the RNTP bitmap bit of "0" will preferentially schedule edge users, followed by the central user.
  • Cells 2 and 3 enter the next statistical period Tperiod re-counts the number of problematic UEs, that is, event-triggered statistics.
  • the OAM After receiving the LOAD INFORMATION of the cell 3, the OAM extracts the minimum value of the RNTP threshold of the request of all the neighboring cells received, and replaces the RNTP threshold that is being used if not requested.
  • band resources For the cell shown in Figure 5, all the band resources are equally divided into 3 parts, where A is the frequency band dedicated to all cell center users, and for cell 1, the frequency band available to the edge user is B; available to the cell 2 and 3 edges The band resource is the C area; the band resource available for the cell 4 edge is the B area.
  • the cell 1 center can borrow the frequency band C of the 2 and 3 edges, so the part corresponding to B in the RNTP bitmap of cell 1 is set to "1", and the other frequency bands are set to "0"; in the RNTP bitmap of the same cell 2 and cell 3 The part corresponding to C is set to "1", and the other frequency bands are set to "0”; the portion corresponding to B in the RNTP bitmap of cell 4 is set to "1", and the other frequency bands are set to "0”.
  • the initial state of power on the PRB in which all cells have a RNTP bitmap bit of "0" is allowed to transmit at the maximum transmit power, that is, the maximum allowable PA is initially set to the maximum value.
  • Each cell dynamically adjusts the power on the PRB whose RNTP bitmap bit is "0".
  • the detailed flow is shown in the attached drawing.
  • the cell 1 determines the number of problematic UEs 5>threshold value 3, so the maximum allowed PA-step on the PRB whose bitmap bit is "0" is lowered, and the RNTP threshold value is also lowered by one step, P A is as follows The order is reduced by ⁇ 3, 2, 1, 0, -1.77, -3, -4.77, -6 ⁇ , and the RNTP threshold is reduced in the following order ⁇ 3, 2, 1, 0, -1, -2, -3, -4 , -5, -6, -7, -8, -9, -10, -11, - ⁇ , so the maximum allowable P A value for cell 1 is 2, and the RNTP threshold is 0 dB, cell 1 After the adjustment is completed, the LOAD INFORMATION message is sent to the cells 2 and 3 to the new RNTP threshold.
  • the statistics are directly entered into the next statistical cycle, that is, the event-triggered statistics.
  • the cell 4 determines the number of problematic UEs 4>threshold value 3, so the maximum allowed PA-step is reduced, and the RNTP threshold is also reduced by one step, that is, -IdB; after the cell 4 is adjusted, the LOAD is sent.
  • the INFORMATION message tells the cell 3 the new RNTP threshold.
  • the cells 2 and 3 After receiving the LOAD INFORMATION of the cell 1, the cells 2 and 3 extract the minimum RNTP threshold of all the neighbor cells received.
  • the cell 3 needs to modify its own RNTP threshold to be -1, and the maximum allowed PA value on the PRB whose bitmap bit is "0". It is also necessary to reduce 2 steps, that is, ldB, and then the cell 3 sends a LOAD INFORMATION message to inform the cell 1 and P 4 of the new RNTP threshold. Similarly, after receiving the message, the cell 1 also changes its RNTP threshold to 1, and the bitmap bit is The maximum allowed PA value on the PRB of "0" is modified to IdB, then the cell 1 sends a LOAD INFORMATION message to inform the cell 2 of the new RNTP threshold, and the cell 2 also needs to modify its own RNTP threshold to be 1, and the bitmap bit is "0" PRB.
  • the maximum allowable P A value is modified to IdB; ( 6.2) After each cell modifies the RNTP threshold and the PA value, the PRB scheduling center user with the cell 1RNTP bitmap bit set to "1" is scheduled during scheduling, and the PRB priority scheduling edge user with the RNTP bitmap bit of "0" is followed by the center. user.
  • band resources For the cell shown in Figure 4, all the band resources are equally divided into 3 parts, where A is the frequency band dedicated to all cell center users, and for cell 1, the frequency band available to the edge user is B; available to the cell 2 and 3 edges The band resource is the C area; the band resource available for the cell 4 edge is the B area.
  • the cell 1 center can borrow the frequency band C of the 2 and 3 edges, so the part corresponding to B in the RNTP bitmap of the cell 1 is set to "1", and the other frequency bands are set to "0"; the corresponding RNTP bitmaps of the cells 2 and 3 correspond to The portion of C is set to "1", and the other bands are set to "0”; the portion of the RNTP bitmap of cell 4 corresponding to B is set to "1", and the other bands are set to "0".
  • the cells 1, 3, and 4 determine that the number of problematic UEs is 0. Therefore, a request to increase the RNTP threshold by one step is sent to the OAM, and the order is increased in the following order: ⁇ - ⁇ , -11, -10, -9, -8, -7 , -6, -5, -4, -3, -2, -1, 0, 1, 2, 3 ⁇ , , the requested RNTP threshold is 2dB; the cell 2 is between 0 and the threshold 3, therefore, the cell 2 directly enters the next statistical cycle to restart counting the number of problematic UEs, ie Event triggered statistics.
  • the cell 3 After receiving the notification, the cell 3 raises its RNTP threshold to 2 dB, and adjusts the maximum allowed PA-step on the PRB whose RNTP bitmap bit is "0" to be ldB. (8) After all the cells have their own RNTP thresholds, they must enter the event-triggered statistics and enter the next statistical period to restart counting the number of UEs with problems. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein.
  • FIG. 8 is a structural block diagram of an inter-cell interference coordination system according to an embodiment of the present invention. As shown in FIG. 8, a first cell 82 and a second cell 84 adjacent to the first cell 82 are included, where the first cell 82 includes statistics. Module 822 and adjustment module 824, the structure of which is described in detail below.
  • the statistics module 822 is configured to count the number of user equipments in the QOS that are not up to standard or the number of user equipments that fail to reach the radio link.
  • the adjustment module 824 is connected to the statistics module 822, and is set according to the statistics of the statistics module 822 and the preset number.
  • the number threshold, adjusting the RNTP threshold of the first cell 82 and/or the second cell 84 are provided.
  • the RNTP threshold of the neighboring cell is adjusted according to the number of the user equipments that fail to meet the standard QOS or the number of the user equipments that fail the radio link, so that the inter-cell interference coordination can be implemented according to the network load change, thereby optimizing the performance of the cell edge.
  • Industrial Applicability The technical solution of the present invention has industrial applicability. According to the statistics of the number of user equipments that fail to meet the standard QOS or the number of user equipments that fail to reach the radio link, the RNTP threshold of the neighboring area can be adjusted, and inter-cell interference coordination can be implemented according to the network load change. Thereby optimizing the performance of the cell edge.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种小区间干扰协调方法及系统,该方法包括:第一小区统计自身中QOS未达标的用户设备或者无线链路失败的用户设备的数量;根据数量与预先设定的数量门限,调整第一小区和/或与第一小区相邻的第二小区的RNTP门限。本发明可以实现根据网络负荷变化进行小区间干扰协调,从而优化小区边缘的性能。

Description

小区间干扰协调方法及系统 技术领域 本发明涉及通信领域, 具体而言, 涉及一种小区间干扰协调方法及系统。 背景技术 小区间干扰(Inter-Cell Interference, 简称为 ICI)是蜂窝移动通信系统的一个固有 问题,传统的解决方法是采用频率复用。未来的宽带移动通信系统长期演进 (Long-Term Evolution, 简称为 LTE) 对频谱效率的要求很高, 因此希望尽可能地接近频谱复用系 数 1。 正交频分复用 (Orthogonal Frequency Division Multiplexing, 简称为 OFDM) 技 术比码分多址 (Code Division Multiple Access, 简称为 CDMA) 技术更好地解决了小 区内干扰的问题,但是作为代价, OFDM系统带来的 ICI问题比 CDMA系统更加严重。 如果两个相邻小区在它们的结合部使用相同的频谱资源, 则会产生较强的 ICI。 下行链路小区间的干扰来自邻近小区的基站, 当频谱复用系数为 1时, 小区内任 何用户将不可避免地受到邻小区下行信号的干扰, 位于小区中心的用户由于邻近小区 信号大尺度的衰落相对较大, 因此受到的干扰相对也较小, 但位于小区边缘的用户有 用信号衰减较大, 而邻近小区信号衰减相对较低, 因此从 UE感受度上来看受到的干 扰更加严重, 3GPP LTE 主要利用各种干扰协调技术 (Inter-Cell Interference Coordination, 简称为 ICIC)进行干扰控制, 降低干扰水平, 提高边缘用户吞吐量。 小 区间干扰协调的基本原理都是对下行或上行资源(频带或功率)管理设置一定的限制, 以协调各个小区的动作, 避免产生严重的小区间干扰。 而各个厂商提出最多的是采用 部分频率复用 (Fractional Frequency Reuse,简称为 FFR)或软频率复用 ( Soft Frequency Reuse, 简称为 SFR), 即小区边缘只能使用整个可用频段的一部分, 且相邻小区边缘 使用的频率要错开, 小区边缘使用的频段以高功率发送, 小区内部可使用整个频段, 如果小区内部使用相邻小区边缘频段需要低功率发送。 从 FFR或 SFR的角度, 下行窄带发射功率指示 (Relative Narrowband TX Power, 简称为 RNTP) 指示的 bitmap是静态配置的, 开始就按照规划, 分配了 0和 1, 一旦 分配好, 就固定不能改变。 但是, 根据该固定的 bitmap进行小区间干扰协调, 不能适应网络负荷的变化, 从 而限制小区间干扰协调的性能。 发明内容 本发明提供了一种小区间干扰协调方法及系统, 以至少解决相关技术中根据固定 的 bitmap进行小区间干扰协调, 不能适应网络负荷变化的问题。 为了实现上述目的, 根据本发明的一个方面, 提供了一种小区间干扰协调方法。 根据本发明的小区间干扰协调方法包括:第一小区统计自身中 QOS未达标的用户 设备或者无线链路失败的用户设备的数量; 根据数量与预先设定的数量门限, 调整第 一小区和 /或与第一小区相邻的第二小区的 RNTP门限。 根据数量与预先设定的数量门限,调整第一小区和 /或与第一小区相邻的第二小区 的 RNTP门限包括: 在数量大于等于数量门限的情况下, 降低第一小区和 /或与第一小 区相邻的第二小区的 RNTP门限。 降低第一小区和 /或与第一小区相邻的第二小区的 RNTP门限包括:第一小区确定 降低后的 RNTP门限;第一小区使用降低后的 RNTP门限;第一小区降低 RNTP bitmap 中位为零的物理资源块 PRB上的发射功率; 第一小区向第二小区发送降低后的 RNTP 门限。 降低第一小区和 /或与第一小区相邻的第二小区的 RNTP门限还包括:第二小区接 收到来自第一小区的降低后的 RNTP门限; 第二小区接收到来自与第二小区相邻的第 三小区的 RNTP门限;第二小区在降低后的 RNTP门限和来自相邻的第三小区的 RNTP 门限之中, 确定较低的 RNTP门限; 第二小区判断较低的 RNTP门限是否小于第二小 区当前使用的 RNTP门限; 如果判断结果为是, 则第二小区使用较低的 RNTP门限, 并降低 RNTP bitmap中位为零的 PRB上的发射功率。 根据数量与预先设定的数量门限,调整第一小区和 /或与第一小区相邻的第二小区 的 RNTP门限包括: 在数量为零的情况下, 提高第一小区和 /或与第一小区相邻的第二 小区的 RNTP门限。 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP门限包括:第一小区确定 请求提高的 RNTP门限; 第一小区向运行、 管理和维护 OAM发送请求提高的 RNTP 门限。 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP门限还包括: OAM接收 到来自第一小区的请求提高的 RNTP门限; OAM接收到来自第二小区的 RNTP门限, 其中来自第二小区的 RNTP门限包括以下之一: 第二小区请求提高的 RNTP门限、 第 二小区当前使用的 RNTP门限; OAM接收到来自与第一小区相邻的第四小区的 RNTP 门限, 其中来自第四小区的 RNTP门限包括以下之一: 第四小区请求提高的 RNTP门 限、 第四小区当前使用的 RNTP门限; 在第一小区的邻区仅包含第二小区和第四小区 的情况下, OAM在来自第二小区的 RNTP门限和来自第四小区的 RNTP门限之中, 确定较低的 RNTP门限; OAM判断较低的 RNTP门限是否大于来自第一小区的请求 提高的 RNTP门限; 如果判断结果为是, 则 OAM通知第一小区使用较低的 RNTP门 限。 在 OAM通知第一小区使用较低的 RNTP门限之后, 上述方法还包括: 第一小区 使用较低的 RNTP门限; 第一小区提高 RNTP bitmap中位为零的 PRB上的发射功率。 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP门限还包括: OAM接收 到来自第一小区的请求提高的 RNTP 门限; OAM接收到来自第二小区的请求提高的 RNTP门限; OAM接收到来自与第二小区相邻的第五小区的 RNTP门限, 其中来自第 五小区的 RNTP门限包括以下之一: 第五小区请求提高的 RNTP门限、 第五小区当前 使用的 RNTP门限;在第二小区的邻区仅包含第一小区和第五小区的情况下, OAM在 来自第一小区的请求提高的 RNTP门限和来自第五小区的 RNTP门限之中, 确定较低 的 RNTP 门限; OAM判断较低的 RNTP 门限是否大于来自第二小区的请求提高的 RNTP门限; 如果判断结果为是, 则 OAM通知第二小区使用较低的 RNTP门限。 在 OAM通知第二小区使用较低的 RNTP门限之后, 上述方法还包括: 第二小区 使用较低的 RNTP门限; 第二小区提高 RNTP bitmap中位为零的 PRB上的发射功率。 根据数量与预先设定的数量门限,调整第一小区和 /或与第一小区相邻的第二小区 的 RNTP门限包括: 在数量小于数量门限并且数量不等于零的情况下, 第一小区再统 计自身中 QOS未达标的用户设备或者无线链路失败的用户设备的数量。 第一小区通过包括以下之一的统计方式统计自身中 QOS 未达标的用户设备或者 无线链路失败的用户设备的数量: 自第一小区运行时开始, 按照预先设定的周期进行 统计的周期统计方式; 自第一小区的 RNTP门限调整时开始, 按照预先设定的周期进 行统计的事件统计方式。 为了实现上述目的,根据本发明的另一个方面,提供了一种小区间干扰协调系统。 根据本发明的小区间干扰协调系统包括第一小区和与第一小区相邻的第二小区, 其中第一小区包括: 统计模块, 设置为统计自身中 QOS未达标的用户设备或者无线链 路失败的用户设备的数量; 调整模块, 设置为根据数量与预先设定的数量门限, 调整 第一小区和 /或第二小区的 RNTP门限。 通过本发明,根据统计的 QOS未达标的用户设备或者无线链路失败的用户设备的 数量调整邻区的 RNTP门限, 可以实现根据网络负荷变化进行小区间干扰协调, 从而 优化小区边缘的性能。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例的小区间干扰协调方法的流程图; 图 2是根据本发明优选实施例的小区间干扰协调方法的流程图; 图 3是根据本发明优选实施例一的划分频带资源及设置 RNTP bitmap的示意图; 图 4是根据本发明优选实施例一的交互流程图; 图 5 是根据本发明优选实施例二和优选实施例三的划分频带资源及设置 RNTP bitmap的示意图; 图 6是根据本发明优选实施例二的交互流程图; 图 7是根据本发明优选实施例三的交互流程图; 图 8是根据本发明实施例的小区间干扰协调系统的结构框图。 具体实施方式 需要说明的是, 在不冲突的情况下, 本申请中的实施例及实施例中的特征可以相 互组合。 下面将参考附图并结合实施例来详细说明本发明。 本发明实施例提供了一种小区间干扰协调方法。 图 1是根据本发明实施例的小区 间干扰协调方法的流程图, 如图 1所示, 包括如下的步骤 S102至步骤 S104。 步骤 S102, 第一小区统计自身中 QOS未达标的用户设备或者无线链路失败的用 户设备的数量。 步骤 S104,根据数量与预先设定的数量门限,调整第一小区和 /或与第一小区相邻 的第二小区的 RNTP门限。 相关技术中,根据固定的 bitmap进行小区间干扰协调,不能适应网络负荷的变化。 本发明实施例中,根据统计的 QOS未达标的用户设备或者无线链路失败的用户设备的 数量调整邻区的 RNTP门限, 可以实现根据网络负荷变化进行小区间干扰协调, 从而 优化小区边缘的性能。 需要说明的是, 本发明可以利用已有的信令流程 (例如, 通过 X2接口的 LOAD INFORMATION消息) 调整邻区的 RNTP门限, 从而可以较好的兼容现有协议。 需要说明的是, 上述预先设定的数量门限可以根据边缘 UE总个数和 /或边缘负荷 进行设定。 优选地, 根据数量与预先设定的数量门限, 调整第一小区和 /或与第一小区相邻的 第二小区的 RNTP 门限包括: 在数量大于等于数量门限的情况下, 降低第一小区和 / 或与第一小区相邻的第二小区的 RNTP门限。 优选地, 降低第一小区和 /或与第一小区相邻的第二小区的 RNTP门限包括: 第一 小区确定降低后的 RNTP 门限; 第一小区使用降低后的 RNTP 门限; 第一小区降低 RNTP bitmap中位为零的 PRB上的发射功率;第一小区向第二小区发送降低后的 RNTP 门限。 优选地, 降低第一小区和 /或与第一小区相邻的第二小区的 RNTP门限还包括: 第 二小区接收到来自第一小区的降低后的 RNTP门限; 第二小区接收到来自与第二小区 相邻的第三小区的 RNTP门限; 第二小区在降低后的 RNTP门限和来自相邻的第三小 区的 RNTP门限之中, 确定较低的 RNTP门限; 第二小区判断较低的 RNTP门限是否 小于第二小区当前使用的 RNTP 门限; 如果判断结果为是, 则第二小区使用较低的 RNTP门限, 并降低 RNTP bitmap中位为零的 PRB上的发射功率。 优选地, 根据数量与预先设定的数量门限, 调整第一小区和 /或与第一小区相邻的 第二小区的 RNTP门限包括: 在数量为零的情况下, 提高第一小区和 /或与第一小区相 邻的第二小区的 RNTP门限。 优选地, 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP门限包括: 第一 小区确定请求提高的 RNTP 门限; 第一小区向运行、 管理和维护运行、 管理和维护 (Operation Administration and Maintenance, 简称为 OAM) 发送请求提高的 RNTP门 限。 优选地, 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP 门限还包括: 0AM接收到来自第一小区的请求提高的 RNTP 门限; 0AM接收到来自第二小区的 RNTP 门限, 其中来自第二小区的 RNTP 门限包括以下之一: 第二小区请求提高的 RNTP门限、第二小区当前使用的 RNTP门限; 0AM接收到来自与第一小区相邻的第 四小区的 RNTP门限, 其中来自第四小区的 RNTP门限包括以下之一: 第四小区请求 提高的 RNTP门限、 第四小区当前使用的 RNTP门限; 在第一小区的邻区仅包含第二 小区和第四小区的情况下, 0AM在来自第二小区的 RNTP 门限和来自第四小区的 RNTP门限之中,确定较低的 RNTP门限; 0AM判断较低的 RNTP门限是否大于来自 第一小区的请求提高的 RNTP门限; 如果判断结果为是, 则 0AM通知第一小区使用 较低的 RNTP门限。 优选地, 在 0AM通知第一小区使用较低的 RNTP门限之后, 上述方法还包括: 第一小区使用较低的 RNTP门限;第一小区提高 RNTP bitmap中位为零的 PRB上的发 射功率。 优选地, 提高第一小区和 /或与第一小区相邻的第二小区的 RNTP 门限还包括: 0AM接收到来自第一小区的请求提高的 RNTP门限; 0AM接收到来自第二小区的请 求提高的 RNTP门限; 0AM接收到来自与第二小区相邻的第五小区的 RNTP门限, 其中来自第五小区的 RNTP门限包括以下之一: 第五小区请求提高的 RNTP门限、 第 五小区当前使用的 RNTP门限; 在第二小区的邻区仅包含第一小区和第五小区的情况 下, 0AM在来自第一小区的请求提高的 RNTP门限和来自第五小区的 RNTP门限之 中, 确定较低的 RNTP门限; 0AM判断较低的 RNTP门限是否大于来自第二小区的 请求提高的 RNTP门限;如果判断结果为是,则 0AM通知第二小区使用较低的 RNTP 门限。 优选地, 在 0AM通知第二小区使用较低的 RNTP门限之后, 上述方法还包括: 第二小区使用较低的 RNTP门限;第二小区提高 RNTP bitmap中位为零的 PRB上的发 射功率。 优选地, 根据数量与预先设定的数量门限, 调整第一小区和 /或与第一小区相邻的 第二小区的 RNTP门限包括: 在数量小于数量门限并且数量不等于零的情况下, 第一 小区再统计自身中 Q0S未达标的用户设备或者无线链路失败的用户设备的数量。 优选地,第一小区通过包括以下之一的统计方式统计自身中 QOS未达标的用户设 备或者无线链路失败的用户设备的数量: 自第一小区运行时开始, 按照预先设定的周 期进行统计的周期统计方式; 自第一小区的 RNTP门限调整时开始, 按照预先设定的 周期进行统计的事件统计方式。 优选地, 在实际统计过程中, 其它各小区的统计方式可以与第一小区类似, 即包 括以下之一: 自该小区运行时开始, 按照预先设定的周期进行统计的周期统计方式; 自该小区的 RNTP门限调整时开始, 按照预先设定的周期进行统计的事件统计方式。 优选地,在第一小区统计自身中 Q0S未达标的用户设备或者无线链路失败的用户 设备的数量之前, 上述方法还包括: 对所有小区根据不同的拓扑结构以簇为单位, 把 整个下行系统带宽划分为两部分, 一部分给中心用户使用, 另一部分给边缘用户使用, 对于边缘用户使用的频带要保证相邻小区间是完全错开的。 中心用户可以借用邻小区 边缘用户的频率资源, 如果借用, 则中心用户使用时发射功率要受到限制。 优选地, 在把整个下行系统带宽划分为两部分之后, 所述方法还包括: 所有小区 对划分给本小区的边缘用户使用的 PRB上对应的 RNTP bitmap位置为" 1 ",对置为" 1 " 的 PRB上的发射功率不受限制, 允许一直以最大发射功率发射, 即对应的 PA值可以 一直允许取最大值; 对其它用户使用的 PRB上对应的 RNTP bitmap均置为 "0", 对置 为 "0" 的 PRB上的发射功率是受到限制的, 可以动态调整。 优选地, 对置为 "0" 的 PRB上的发射功率进行动态调整包括: 初始功率预先调 整为以满功率发射, 即该 PRB上的 PA (A类符号上 PDSCH的功率相对于小区参考信 号功率的差值) 对应的值设为协议中规定的最大值。 优选地, 收到 RNTP指示的小区在调度时, 会把邻小区 RNTP bitmap位为 " 1 " 的 PRB只能调度本小区中心的用户, 而邻小区 RNTP bitmap位为 "0"的 PRB优先调 度本小区边缘的用户, 其次为中心用户。 下面结合图 2对上述的小区间干扰协调方法进行描述。 图 2是根据本发明优选实施例的小区间干扰协调方法的流程图, 如图 2所示, 包 括如下的步骤 S202至步骤 S230。 步骤 S202,所有小区每个 PRB上最大允许的 PA初始值设为协议中规定的最大值。 步骤 S204, 开始统计 Tpend时间内本小区有问题的 UE的个数 Num。 步骤 S206, 判断 Num是否大于等于 TrdNum, 如果是, 则进行步骤 S208, 否则 进行步骤 S218。 步骤 S208, 最大允许的 PA降低一个 step, 同时 RNTP门限也降低一个 step。 步骤 S210, 通知所有邻小区新的 RNTP门限。 步骤 S212, 邻小区收到后, 提取接收到的所有 RNTP门限的最小值 MinTrd。 步骤 S214, 邻小区判断正在用的 RNTP门限是否大于 MinTrd, 如果是, 则进行 步骤 S216, 否则返回步骤 S204, 即邻小区继续统计 Tpend时间内本小区有问题的 UE 的个数 Num。 步骤 S216, 邻小区修改自己的 RNTP门限为 MinTrd, 以及允许的最大 PA。 步骤 S218,判断 Num是否等于 0,如果是,则进行步骤 S220,否则返回步骤 S204, 本小区重新开始统计 Tpend时间内本小区有问题的 UE的个数 Num。 步骤 S220, 向 OAM发送一个提高 RNTP门限的请求以及目标门限 RTrd。 步骤 S222, OAM提取其所有邻小区请求的 RNTP门限 (若邻小区没有请求的, 取邻小区正在使用的门限) 的最小值 MinReTrd。 步骤 S224, 判断 MinReTrd是否大于 RTrd, 如果是, 则进行步骤 S226, 否则进行 步骤 S230。 步骤 S226, OAM通知该小区提高 RNTP门限为 MinReTrd。 步骤 S228, 修改自己的 RNTP门限为 MinReTrd, 以及允许的最大 PA。 步骤 S230, OAM通知该小区不能提高 RNTP门限。 下面将结合实例对本发明实施例的实现过程进行详细描述。 优选实施例一 图 3是根据本发明优选实施例一的划分频带资源及设置 RNTP bitmap的示意图, 如图 3所示, 包括互为邻区的三个小区, 下面以小区 1为主线对技术方案的实施作进 一步的详细描述。 设该三个小区的 TrdNum=3, 且初始的 RNTP Threshold均为 ldB。 ( 1 ) 划分频带资源。 整个系统带宽分为 4个部分, 划分时以 PRB为单位, 可以是连续的也可以是不连 续的,频带 A对应的频带是三个小区中心均可使用的部分,而 B是小区 1边缘使用的, C是小区 2边缘使用的, D是小区 3边缘使用的; (2) 设置 RNTP bitmap。 小区 1中心可以借用 2和 3边缘的频带 C和 D, 因此小区 1的 RNTP bitmap中对 应 B的部分置为 " 1 ", 其它频带就置为 "0"; 同理小区 2的 RNTP bitmap中对应 C的 部分置为" 1 ",其它频带就置为" 0";小区 3的 RNTP bitmap中对应 D的部分置为" 1 ", 其它频带就置为 "0"。 ( 3 )所有小区 RNTP bitmap位为 "0"的 PRB上的功率初始状态都允许以最大发 射功率发射, 即最大允许的 PA初始设为协议中规定的最大值 3 dB。
(4)在统计周期 Tperiod内统计本小区有问题 UE的个数,包括 QOS无法满足的 或无线链路失败的 UE, 假设小区 1的统计值为 5, 小区 2的为 1, 小区 3的为 0。
( 5 )各小区动态调整 RNTP bitmap位为 "0"的 PRB上的功率, 详细流程见附图 4。 小区 1判断有问题的 UE个数 5>门限值 3, 因此降低 bitmap位为 "0" 的 PRB上 最大允许的 PA—个 step, 同时 RNTP门限值也要降低一个 step, PA按照如下顺序降 低 {3, 2, 1, 0, -1.77, -3 , -4.77, -6} , RNTP门限按照如下顺序降低 {3, 2, 1, 0, -1, -2, -3, -4, -5, -6, -7, -8 , -9, -10, -11, -∞} , 因此小区 1降低后最大允许的 的 PA值就为 2, RNTP门限就为 0dB, 调整完毕后发 LOAD INFORMATION (负荷消 息)告诉小区 2和 3新的 RNTP门限; 小区 2发现有问题的 UE个数介于 TrdNum和 0 之间, 则直接触发下一个统计周期 Tperiod重新统计, 即事件触发的统计; 小区 3发 现其服务的 UE均没有问题, 则向 OAM发送提高 RNTP门限一个 step的请求, RNTP 门限按照如下顺序提高 {-∞, -11, -10, -9, -8, -7, -6, -5, -4, -3 , -2, -1, 0, 1, 2, 3 } , 即希望 RNTP门限提高到 2dB。
( 6) 小区 2和 3收到小区 1的 LOAD INFORMATION后, 提取接收到的所有邻 小区的最小的 RNTP门限, 这里两个小区都只是收到了小区 1的 RNTP门限, 并和自 己正在使用的门限进行比较。 (6.1 ) 小区 2和小区 3当前使用的为 1, 均大于接收到的门限 0, 修改自己正在 使用的门限为 0, 并修改 RNTP bitmap位为 "0" 的 PRB上的功率即 PA值为 2。
(6.2) 修改后, 小区 2和 3在调度时会把小区 1RNTP bitmap位为 " 1 " 的 PRB 调度中心用户, RNTP bitmap位为 "0" 的 PRB优先调度边缘用户, 其次为中心用户。 (6.3 ) 小区 2和 3进入下一个统计周期 Tperiod重新统计有问题 UE的个数, 即 事件触发的统计。
(7) OAM收到小区 3的 LOAD INFORMATION后,提取接收到的所有邻小区的 请求的 RNTP门限的最小值, 如果没有请求的则用正在使用的 RNTP门限代替。
(7.1 )小区 1和小区 2当前使用的为 0, 均小于接收到的门限 2, 因此 OAM通知 该小区不能够提高 RNTP门限。 优选实施例二 图 5 是根据本发明优选实施例二和优选实施例三的划分频带资源及设置 RNTP bitmap的示意图, 如图 5所示, 包括具有多层邻区的四个小区, 其中小区 1的邻区分 别为小区 2和小区 3,小区 2的邻区只有小区 1,小区 3的邻区分别为小区 1和小区 4, 小区 4的邻区只有小区 3。 设所有小区的 TrdNum=3, 小区 1、 2、 3初始的 RNTP Threshold均为 ldB, 小区 4初始的 RNTP Threshold为 0dB。
( 1 ) 划分频带资源。 对于附图 5所示的小区, 所有的频带资源平均分为 3份, 其中 A为所有小区中心 用户专用的频带, 对于小区 1, 边缘用户可使用的频带为 B; 对小区 2和 3边缘可用 的频带资源为 C区域; 对于小区 4边缘可用的频带资源为 B区域。
(2) 设置 RNTP bitmap。 小区 1中心可以借用 2和 3边缘的频带 C, 因此小区 1的 RNTP bitmap中对应 B 的部分置为 " 1 ", 其它频带就置为 "0"; 同理小区 2和小区 3的 RNTP bitmap中对应 C的部分置为 " 1 ", 其它频带就置为 "0"; 小区 4的 RNTP bitmap中对应 B的部分置 为 " 1 ", 其它频带就置为 "0"。 ( 3 )所有小区 RNTP bitmap位为 "0"的 PRB上的功率初始状态都允许以最大发 射功率发射, 即最大允许的 PA初始设为最大值。
(4)在统计周期 Tperiod内统计本小区有问题 UE的个数,包括 QOS无法满足的 或无线链路失败的 UE, 假设小区 1的统计值为 5, 小区 2的为 1, 小区 3的为 2, 小 区 4的为 4。
( 5 )各小区动态调整 RNTP bitmap位为 "0"的 PRB上的功率, 详细流程见附图
6。 小区 1判断有问题的 UE个数 5>门限值 3, 因此降低 bitmap位为 "0" 的 PRB上 最大允许的 PA—个 step, 同时 RNTP门限值也要降低一个 step, PA按照如下顺序降 低 {3, 2, 1, 0, -1.77, -3 , -4.77, -6} , RNTP门限按照如下顺序降低 {3, 2, 1, 0, -1, -2, -3 , -4, -5, -6, -7, -8 , -9, -10, -11, -∞} , 因此小区 1降低后最大允许的 的 PA值就为 2, RNTP门限就为 0dB,小区 1调整完毕后发 LOAD INFORMATION 消 息告诉小区 2和 3新的 RNTP门限; 小区 2、 3发现有问题的 UE个数介于 TrdNum和 0之间, 则直接进入下一个统计周期重新统计即事件触发的统计; 小区 4判断有问题 的 UE个数 4>门限值 3, 因此降低最大允许的 PA—个 step, 同时 RNTP门限值也要降 低一个 step, 即为 -IdB; 小区 4调整完毕后发 LOAD INFORMATION 消息告诉小区 3 新的 RNTP门限。
( 6) 小区 2和 3收到小区 1的 LOAD INFORMATION后, 提取接收到的所有邻 小区的最小的 RNTP门限。 ( 6.1 )对于小区 2只是收到了小区 1的 RNTP门限, 并和自己正在使用的门限进 行比较, 小区 2当前使用的为 1,大于接收到的门限 0,修改自己正在使用的门限为 0, 并修改 RNTP bitmap位为 "0 "的 PRB上的功率即 PA值为 2; 对于小区 3假设除了接 收到小区 1的 RNTP门限外还接收到了小区 4的 RNTP门限值 -1, 则接收到的所有邻 小区的最小的 RNTP门限为 -1, 且小区 3正在使用的 RNTP门限为 1, 因此小区 3要 修改自己的 RNTP门限为 -1, 且 bitmap位为 " 0" 的 PRB上最大允许的 PA值也要降 低 2个 step, 即为 ldB, 然后小区 3发 LOAD INFORMATION 消息告诉小区 1禾 P 4新 的 RNTP门限, 同样小区 1接收到该消息后把自己的 RNTP门限也修改为 1, bitmap 位为" 0"的 PRB上最大允许的 PA值修改为 IdB,然后小区 1发 LOAD INFORMATION 消息告诉小区 2新的 RNTP门限, 小区 2也要修改自己的 RNTP门限为 1, bitmap位 为 "0" 的 PRB上最大允许的 PA值修改为 IdB ; ( 6.2) 每个小区修改 RNTP门限和 PA值后, 在调度时会把小区 1RNTP bitmap 位为 " 1 " 的 PRB调度中心用户, RNTP bitmap位为 "0" 的 PRB优先调度边缘用户, 其次为中心用户。
( 6.3 ) 每个小区修改完成后, 进入下一个统计周期重新统计有问题 UE的个数, 即事件触发的统计。 优选实施例三 以图 5所示的小区为例。 设所有小区 1、 2、 3、 4初始的 RNTP Threshold均为 ldB。 信令流程详见附图 7。
( 1 ) 划分频带资源。 对于附图 4所示的小区, 所有的频带资源平均分为 3份, 其中 A为所有小区中心 用户专用的频带, 对于小区 1, 边缘用户可使用的频带为 B; 对小区 2和 3边缘可用 的频带资源为 C区域; 对于小区 4边缘可用的频带资源为 B区域。
(2) 设置 RNTP bitmap。 小区 1中心可以借用 2和 3边缘的频带 C, 因此小区 1的 RNTP bitmap中对应 B 的部分置为 " 1 ", 其它频带就置为 "0"; 同理小区 2和 3的 RNTP bitmap中对应 C的 部分置为 " 1 ",其它频带就置为 "0";小区 4的 RNTP bitmap中对应 B的部分置为 " 1 ", 其它频带就置为 "0"。
( 3 )所有小区 RNTP bitmap位为 "0"的 PRB上的功率初始状态都允许以最大发 射功率发射, 即最大允许的 PA初始设为最大值, 但本实施例是在网络运行一段时间 之后的进行的操作, 即已经经历了降低功率的过程, 因此 PA 已经降低过, 假设当前 的值为 0dB。
(4)在统计周期 Tperiod内统计本小区有问题 UE的个数,包括 QOS无法满足的 或无线链路失败的 UE, 假设小区 1的统计值为 0, 小区 2的为 1, 小区 3的为 0, 小 区 4的为 0。 ( 5 )各小区动态调整 RNTP bitmap位为 "0"的 PRB上的功率, 详细流程见附图
5。 小区 1、 3、 4判断有问题的 UE个数为 0, 因此向 OAM发送提高 RNTP门限一个 step的请求, 按照如下顺序提高 {-∞, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3} , , 请求的 RNTP门限为 2dB; 小区 2的介于 0和门限 3之间, 因此, 小 区 2直接进入下一个统计周期重新开始统计有问题的 UE个数, 即事件触发的统计。
(6) OAM收到小区 1、 3和小区 4的请求后, 对每个小区分别判断处理。
(6.1 )对于小区 1, 其所有邻小区为小区 2和小区 3, 由于小区 2没有提高 RNTP 门限的请求, 且 2正在使用的门限为 ldB, 低于请求的门限 2dB, 因此 OAM通知小 区 1不提高其 RNTP门限。
(6.2) 对于小区 2没有提高 RNTP门限的请求, 因此 OAM对小区 2不进行任何 通知。
(6.3 ) 对于小区 3, 其所有邻小区 1和 4均有提高 RNTP门限的请求, 且小区 3 也有该请求, 因此 OAM通知小区 3提高其 RNTP门限为所有请求的最小值 2dB。
(6.4)对于小区 4,其邻小区 3有提高 RNTP门限的请求,则小区 4提高其 RNTP 门限为所有请求的最小值 2dB。
(7) 小区 3收到该通知后提高自己的 RNTP门限为 2dB, 并调整 RNTP bitmap 位为 "0" 的 PRB上的最大允许的 PA—个 step为 ldB。 ( 8)所有小区增加自己的 RNTP门限后, 都要进入事件触发的统计, 进入下一个 统计周期重新开始统计有问题的 UE个数。 需要说明的是, 在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的 计算机系统中执行, 并且, 虽然在流程图中示出了逻辑顺序, 但是在某些情况下, 可 以以不同于此处的顺序执行所示出或描述的步骤。 本发明实施例提供了一种小区间干扰协调系统, 该小区间干扰协调系统可以用于 实现上述小区间干扰协调方法。 图 8是根据本发明实施例的小区间干扰协调系统的结 构框图, 如图 8所示, 包括第一小区 82和与第一小区 82相邻的第二小区 84, 其中第 一小区 82包括统计模块 822和调整模块 824, 下面对其结构进行详细描述。 统计模块 822, 设置为统计自身中 QOS未达标的用户设备或者无线链路失败的用 户设备的数量; 调整模块 824, 连接至统计模块 822, 设置为根据统计模块 822统计的 数量与预先设定的数量门限, 调整第一小区 82和 /或第二小区 84的 RNTP门限。 需要说明的是, 装置实施例中描述的小区间干扰协调系统对应于上述的方法实施 例, 其具体的实现过程在方法实施例中已经进行过详细说明, 在此不再赘述。 综上所述, 根据本发明的上述实施例, 提供了一种小区间干扰协调方法及系统。 通过本发明,根据统计的 QOS未达标的用户设备或者无线链路失败的用户设备的数量 调整邻区的 RNTP门限, 可以实现根据网络负荷变化进行小区间干扰协调, 从而优化 小区边缘的性能。 工业实用性 本发明技术方案具备工业实用性,根据统计的 QOS未达标的用户设备或者无线链 路失败的用户设备的数量调整邻区的 RNTP门限, 可以实现根据网络负荷变化进行小 区间干扰协调, 从而优化小区边缘的性能。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 或者将它们分别制作成各个集成电路模 块, 或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明 不限制于任何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种小区间干扰协调方法, 包括:
第一小区统计自身中服务质量 Q0S 未达标的用户设备或者无线链路失败 的用户设备的数量;
根据所述数量与预先设定的数量门限,调整所述第一小区和 /或与所述第一 小区相邻的第二小区的窄带发射功率指示 RNTP门限。
2. 根据权利要求 1所述的方法, 其中, 根据所述数量与预先设定的数量门限, 调 整所述第一小区和 /或与所述第一小区相邻的第二小区的 RNTP门限包括:在所 述数量大于等于所述数量门限的情况下, 降低所述第一小区和 /或与所述第一小 区相邻的第二小区的所述 RNTP门限。
3. 根据权利要求 2所述的方法, 其中, 降低所述第一小区和 /或与所述第一小区相 邻的第二小区的所述 RNTP门限包括:
所述第一小区确定降低后的 RNTP门限;
所述第一小区使用所述降低后的 RNTP门限;
所述第一小区降低 RNTP bitmap中位为零的物理资源块 PRB上的发射功 率; 所述第一小区向所述第二小区发送所述降低后的 RNTP门限。
4. 根据权利要求 3所述的方法, 其中, 降低所述第一小区和 /或与所述第一小区相 邻的第二小区的所述 RNTP门限还包括:
所述第二小区接收到来自所述第一小区的所述降低后的 RNTP门限; 所述第二小区接收到来自与所述第二小区相邻的第三小区的 RNTP门限; 所述第二小区在所述降低后的 RNTP 门限和所述来自相邻的第三小区的 RNTP门限之中, 确定较低的 RNTP门限;
所述第二小区判断所述较低的 RNTP门限是否小于所述第二小区当前使用 的 RNTP门限;
如果判断结果为是, 则所述第二小区使用所述较低的 RNTP门限, 并降低 RNTP bitmap中位为零的 PRB上的发射功率。
5. 根据权利要求 1所述的方法, 其中, 根据所述数量与预先设定的数量门限, 调 整所述第一小区和 /或与所述第一小区相邻的第二小区的 RNTP门限包括:在所 述数量为零的情况下,提高所述第一小区和 /或与所述第一小区相邻的第二小区 的所述 RNTP门限。
6. 根据权利要求 5所述的方法, 其中, 提高所述第一小区和 /或与所述第一小区相 邻的第二小区的所述 RNTP门限包括:
所述第一小区确定请求提高的 RNTP门限;
所述第一小区向运行、管理和维护 OAM发送所述请求提高的 RNTP门限。
7. 根据权利要求 6所述的方法, 其中, 提高所述第一小区和 /或与所述第一小区相 邻的第二小区的所述 RNTP门限还包括:
所述 OAM接收到来自所述第一小区的所述请求提高的 RNTP门限; 所述 OAM接收到来自所述第二小区的 RNTP门限, 其中所述来自所述第 二小区的 RNTP门限包括以下之一: 所述第二小区请求提高的 RNTP门限、 所 述第二小区当前使用的 RNTP门限;
所述 OAM接收到来自与所述第一小区相邻的第四小区的 RNTP门限, 其 中所述来自所述第四小区的 RNTP门限包括以下之一: 所述第四小区请求提高 的 RNTP门限、 所述第四小区当前使用的 RNTP门限; 在所述第一小区的邻区仅包含所述第二小区和所述第四小区的情况下, 所 述 OAM在所述来自所述第二小区的 RNTP 门限和所述来自所述第四小区的 RNTP门限之中, 确定较低的 RNTP门限;
所述 OAM判断所述较低的 RNTP门限是否大于来自所述第一小区的所述 请求提高的 RNTP门限;
如果判断结果为是,则所述 OAM通知所述第一小区使用所述较低的 RNTP 门限。
8. 根据权利要求 7所述的方法, 其中, 在所述 OAM通知所述第一小区使用所述 较低的 RNTP门限之后, 所述方法还包括:
所述第一小区使用所述较低的 RNTP门限;
所述第一小区提高 RNTP bitmap中位为零的 PRB上的发射功率。
9. 根据权利要求 6所述的方法, 其中, 提高所述第一小区和 /或与所述第一小区相 邻的第二小区的所述 RNTP门限还包括:
所述 OAM接收到来自所述第一小区的所述请求提高的 RNTP门限; 所述 OAM接收到来自所述第二小区的所述请求提高的 RNTP门限; 所述 OAM接收到来自与所述第二小区相邻的第五小区的 RNTP门限, 其 中所述来自所述第五小区的 RNTP门限包括以下之一: 所述第五小区请求提高 的 RNTP门限、 所述第五小区当前使用的 RNTP门限; 在所述第二小区的邻区仅包含所述第一小区和所述第五小区的情况下, 所 述 OAM在所述来自所述第一小区的所述请求提高的 RNTP门限和所述来自所 述第五小区的 RNTP门限之中, 确定较低的 RNTP门限;
所述 OAM判断所述较低的 RNTP门限是否大于来自所述第二小区的所述 请求提高的 RNTP门限;
如果判断结果为是,则所述 OAM通知所述第二小区使用所述较低的 RNTP 门限。
10. 根据权利要求 9所述的方法, 其中, 在所述 OAM通知所述第二小区使用所述 较低的 RNTP门限之后, 所述方法还包括:
所述第二小区使用所述较低的 RNTP门限;
所述第二小区提高 RNTP bitmap中位为零的 PRB上的发射功率。
11. 根据权利要求 1所述的方法, 其中, 根据所述数量与预先设定的数量门限, 调 整所述第一小区和 /或与所述第一小区相邻的第二小区的 RNTP门限包括:在所 述数量小于所述数量门限并且所述数量不等于零的情况下, 所述第一小区再统 计自身中 QOS未达标的用户设备或者无线链路失败的用户设备的数量。
12. 根据权利要求 1至 11中任一项所述的方法,其中,第一小区通过包括以下之一 的统计方式统计自身中 QOS 未达标的用户设备或者无线链路失败的用户设备 的数量:
自所述第一小区运行时开始, 按照预先设定的周期进行统计的周期统计方 式;
自所述第一小区的 RNTP门限调整时开始, 按照预先设定的周期进行统计 的事件统计方式。
3. 一种小区间干扰协调系统, 包括第一小区和与所述第一小区相邻的第二小区, 其中所述第一小区包括:
统计模块,设置为统计自身中服务质量 Q0S未达标的用户设备或者无线 路失败的用户设备的数量;
调整模块, 设置为根据所述数量与预先设定的数量门限, 调整所述第一 ^ 区和 /或所述第二小区的窄带发射功率指示 RNTP门限。
PCT/CN2011/083653 2011-03-16 2011-12-07 小区间干扰协调方法及系统 WO2012122831A1 (zh)

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WO2010148768A1 (zh) * 2009-12-29 2010-12-29 中兴通讯股份有限公司 实现小区间干扰协调的基站及小区间干扰协调的方法
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