WO2011095060A1 - 一种频率复用组网方法及设备 - Google Patents
一种频率复用组网方法及设备 Download PDFInfo
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- WO2011095060A1 WO2011095060A1 PCT/CN2011/000186 CN2011000186W WO2011095060A1 WO 2011095060 A1 WO2011095060 A1 WO 2011095060A1 CN 2011000186 W CN2011000186 W CN 2011000186W WO 2011095060 A1 WO2011095060 A1 WO 2011095060A1
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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
- H04W16/14—Spectrum sharing arrangements between different networks
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
Definitions
- Time Division-Synchronous Code Division Multiple Access Long Term Evolution is an advanced technology that can improve the peak data rate, cell edge rate, and spectrum utilization of the system.
- the existing system has made the following changes:
- the CDMA technology is changed to Orthogonal Frequency Division Multiplexing (OFDM) technology to achieve effective multi-path interference against broadband systems.
- OFDM Orthogonal Frequency Division Multiplexing
- OFDM technology originated in the 1960s and has since been continuously improved and developed. After the 1990s, with the development of signal processing technology, it has been widely used in digital broadcasting, digital subscriber line (DSL) and wireless local area network. OFDM technology has the advantages of anti-multipath interference, simple implementation, flexible support, different bandwidth, high spectrum utilization, and efficient adaptive scheduling. It is recognized as the future 4G reserve technology.
- MIMO technology can utilize the spatial channel characteristics of a multi-antenna system to simultaneously transmit multiple data streams, thereby effectively increasing data rate and frequency efficiency.
- NodeB-RNC-CN in order to reduce the delay of control and user plane, to meet the requirements of low latency (control plane delay less than 100ms, user plane delay less than 5ms), the structure of NodeB-RNC-CN in the existing system must be simplified, The RNC will no longer exist as a physical entity, and the NodeB will have some functions of the RC to become an eNodeB.
- the eNodeBs are meshed through the X2 interface and directly connected to the CN.
- the LTE system mainly adopts the following two networking modes:
- Networking mode 1 Use the networking mode with the frequency reuse factor being N, where N is a positive integer greater than 1.
- N is a positive integer greater than 1.
- the value of the frequency reuse factor N is different, and the total available frequency band of the LTE system is divided into multiple sub-bands, and there is no overlapping part between each sub-band, and different cells occupy different sub-bands.
- the bandwidth occupied by the total available frequency band of the LTE system is 60M
- the bandwidth of the 60M is divided into three sub-bands of sub-band 1, sub-band 2, and sub-band 3.
- Each sub-band occupies a bandwidth of 20 MHz, and each sub-band Do not overlap each other.
- cell A, cell B, and cell C occupy subband 1, subband 2, and subband 3, respectively.
- the bandwidth of the total available frequency band of the LTE system is N times the sub-band bandwidth required by a single cell. Therefore, the required LTE system bandwidth is larger, and the frequency utilization rate of the entire system is higher. low.
- Networking mode 2 A networking mode with a frequency reuse factor of 1.
- the total available frequency band of the LTE system is regarded as a sub-band, and each cell occupies the total available frequency band, that is, each cell occupies the same frequency band.
- N the frequency reuse factor
- LTE 6 When the bandwidth occupied by the total available frequency band of the system is 20M, the bandwidth of the 20M is shared by the cell A, the cell B, and the cell C.
- the embodiment of the invention provides a frequency reuse networking method and device, which are used to simultaneously solve the problem that the frequency utilization rate is too low and the inter-cell co-channel interference is large.
- a frequency reuse networking method which divides a total available frequency band of the system into multiple sub-bands; the method for frequency reuse networking includes:
- the divided sub-bands are allocated to each cell, wherein at least two cell-allocated sub-bands overlap.
- a frequency reuse networking device where the device includes:
- a dividing module configured to divide the total available frequency band of the system into multiple sub-bands in advance
- an allocation module configured to allocate the divided sub-bands to each cell, where at least two cell allocated sub-bands overlap.
- the total available frequency band of the system is divided into multiple sub-bands, and if the sub-bands with at least two cell allocations are ensured to be overlapped, the divided sub-bands are allocated to each cell, and therefore, relative to the current
- the sub-band orthogonal networking method in which the frequency reuse factor is N the utilization of the system frequency is improved, and at the same time, compared with the networking method in which the frequency reuse factor of the prior art is 1, the reduction is performed.
- FIG. 6 are schematic diagrams of three networking diagrams in Embodiment 1 of the present invention.
- FIG. 7 is a schematic diagram of a networking in the first embodiment of the present invention.
- FIG. 8 is a schematic diagram of a method for frequency reuse networking in Embodiment 2 of the present invention.
- 9(a) and 9(b) are schematic diagrams showing two networking diagrams in Embodiment 2 of the present invention.
- FIG. 12 are schematic diagrams of three networking technologies in Embodiment 2 of the present invention.
- FIG. 13 is a schematic diagram of reducing the same-frequency interference mode 1 between PBCH/SS and PDSCH of a neighboring cell according to Embodiment 3 of the present invention.
- 14(a), 14(b) and 14(c) are schematic diagrams of three networking diagrams in the third embodiment of the present invention.
- FIG. 15 is a schematic diagram of reducing the same-frequency interference mode 2 between PBCH/SS and PDSCH of a neighboring cell according to Embodiment 3 of the present invention.
- FIG. 16 is a schematic diagram of a method 1 for reducing co-channel interference between a PUCCH and a PUSCH of a neighboring cell according to Embodiment 4 of the present invention
- 17(a), 17(b) and 17(c) are schematic diagrams showing three networking diagrams in the fourth embodiment of the present invention.
- FIG. 18 is a schematic diagram of a method 2 for reducing co-channel interference between a PUCCH and a PUSCH of a neighboring cell according to Embodiment 4 of the present invention
- FIG. 19 is a schematic diagram of a method for reducing co-channel interference between adjacent cells according to Embodiment 5;
- FIG. 20 is a schematic diagram of the networking and OI information of the cell A and the cell B in the fifth embodiment;
- FIG. 21 is a schematic diagram of the frequency reuse networking device in the fifth embodiment.
- the embodiment of the present invention provides a frequency reuse networking solution, which divides the total available frequency band of the system into multiple sub-bands. In the case of ensuring that at least two cell allocation sub-bands overlap, the divided sub-bands are allocated to each cell, thereby improving the system frequency compared to the prior art networking mode 1. Compared with the networking mode 2 of the prior art, the utilization of the same-frequency interference between cells is reduced.
- the frequency reuse networking mode involved in the embodiments of the present invention may also be referred to as a "Frequency Shifted Frequency Reuse” (FSFR) networking.
- FSFR Frequency Shifted Frequency Reuse
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- FIG. 3 it is a schematic diagram of a method for frequency reuse networking in Embodiment 1 of the present invention, where the method includes the following steps:
- Step 101 The system generally divides the total available frequency band into multiple sub-bands.
- the number of divided sub-bands may be the same as the frequency reuse factor N.
- the plurality of divided sub-bands at least two sub-bands have overlapping portions, that is, at least two sub-bands do not intersect. There are two specific situations:
- Either subband has an overlap with the rest of the sub-band, or only a portion of the sub-band has an overlap, and the remaining sub-band does not overlap with the remaining sub-bands.
- the overlap between the two sub-bands involved in the first embodiment may mean that the bandwidth occupied by the two sub-bands partially overlaps, or that the bandwidth occupied by the two sub-bands completely overlaps.
- Step 101 is performed when the sub-band needs to be re-divided when the system changes. Step 101 is not required to be performed every time the networking is performed.
- the solution in the first embodiment is not limited to the case where step 101 is executed each time.
- the size of the occupied bandwidth of each subband may be the same or different.
- Step 102 Assign the divided sub-bands to each cell, and at least two cell-assigned sub-bands overlap.
- sub-band division may be performed in units of cells, or a set of multiple neighboring cells may be defined as a cell cluster, and the total available frequency band is divided into a bandwidth subset, and each bandwidth subset includes multiple sub-bands.
- a subband is allocated for a cell, multiple subbands in one bandwidth subset may be allocated to multiple cells in one cell cluster.
- two sub-bands can be allocated for each cell:
- sub-band 1 can be allocated to cell A
- subband 2 is allocated to cell B
- subband 3 is allocated to cell C, where cells A, B, and C are neighboring cells of the same site.
- each sub-band (sub-band 1, sub-band 2, and sub-band 3) also occupies a 20M bandwidth, with some overlap between any two sub-bands.
- the embodiment of the present invention can also be applied to other available frequency bands, such as the total available frequency bands of 15 MHz, 25 MHz, 35 MHz, and 45 MHz.
- the second allocation method allocates multiple sub-bands for at least one cell.
- the second allocation mode in order to make the inter-resource interference of the same cell allocation smaller, it is required to allocate to the same, and the plurality of sub-bands of the area do not overlap, that is, two or two orthogonal.
- sub-band 1 sub-band 2
- sub-band 3 sub-band 4
- subband 5 are allocated to cell C (subband 4 and sub Band 5 orthogonal).
- the first distribution method described above can be applied in a single carrier system, and the second allocation method can be applied in a multi-carrier system, such as an effective application in a time division multiplexing long term evolution (LTE TDD) system, and a long-term evolution of frequency division multiplexing ( LTE FDD) systems, advanced time division multiplexing long-term evolution (LTE-ATDD) systems, advanced frequency division multiplexing long-term evolution (LTE-A FDD) systems, global microwave interconnect access (WiMAX) systems, and IEEE802, 16m systems in.
- LTE TDD time division multiplexing long term evolution
- LTE FDD long-term evolution of frequency division multiplexing
- LTE-ATDD advanced time division multiplexing long-term evolution
- LTE-A FDD advanced frequency division multiplexing long-term evolution
- WiMAX global microwave interconnect access
- IEEE802 16m systems in.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the second embodiment of the present invention is a detailed description of the first embodiment based on the first embodiment.
- a schematic diagram of a method according to Embodiment 2 of the present invention includes the following steps: Step 201: The total available frequency band of the system is divided into multiple sub-bands in advance.
- Step 202 Determine a correlation between the plurality of subbands obtained by the division.
- the correlation between the sub-bands is first determined between the sub-bands allocated to the cells, and the correlation is small.
- a cell with a relatively close physical distance is allocated to a cell with a relatively large physical distance to minimize the co-channel interference between cells with a relatively close physical distance.
- the specific algorithm is: The larger the quotient obtained by dividing the bandwidth occupied by the overlapping portions of the two sub-bands by the total bandwidth occupied by the two sub-bands, the greater the correlation between the two sub-bands.
- the quotient is 0, and the two sub-bands are irrelevant; when the two sub-bands partially overlap, the quotient is greater than 0 and less than 1; When the two sub-bands completely overlap, the quotient is 1.
- the bandwidth occupied by the overlapping portion of the subband 1 and the subband 2 is 10M
- the total bandwidth occupied by subband 1 and subband 2 is 30M
- the quotient of the bandwidth occupied by the overlap of subband 1 and subband 2 divided by the total bandwidth occupied by the two subbands is 1/3
- subband 1 and subband 3 The overlapped part occupies 15M
- the total bandwidth occupied by subband 1 and subband 3 is 30M.
- the bandwidth occupied by the overlap of subband 1 and subband 3 is divided by the total bandwidth occupied by the two subbands. . Therefore, the correlation between sub-band 1 and sub-band 2 is less than the correlation between sub-band 1 and sub-band 3.
- Step 203 The closer the physical distance between the two cells, the smaller the correlation between the sub-bands allocated to the two cells.
- the correlation between subband 1 and subband 3 is large, the cell C farthest from cell D is allocated subband 3, subband 1 can be allocated in cell D, but cell A far from cell D has Subband 1 is allocated, therefore, subband 1 allocated in cell D and subband 1 in cell A will have certain co-channel interference; on the other hand, when subband 3 is allocated in cell D, although subband 2 and subband The correlation between the bands 3 is relatively high, but since the distance between the cell D and the cell C is the farthest, the cell D allocation sub-band 3 can reduce the co-channel interference between the cell D and the cell C.
- the physical distance between the cells is taken as an example to describe the manner in which the sub-bands are allocated to the cell, and the embodiment of the present invention is not limited to the manner in which the sub-bands are allocated to the cell by other principles.
- Step 204 Determine whether the load of the neighboring cell is lower than the negative threshold for the neighboring cells with overlapping sub-occupations; if yes, go to step 205; otherwise, go to step 206.
- the cell may be used according to the overlap between the subbands of the neighboring cell. Configure the conditions for the use of subband resources.
- the total available frequency band is 30 MHz, which is divided into two subbands, subband 1 and subband 2, each subband occupying a bandwidth of 20M, subband 1 and subband 2 There is an overlap portion of 10 M bandwidth (slashed portion in Fig. 9 (b)), subband 1 is allocated to cell 1, and subband 2 is allocated to cell 2 adjacent to cell 1.
- cell A preferentially uses the left 10M bandwidth resource of subband 1
- cell B preferentially uses the right 10M bandwidth resource of subband 2, that is, both cell A and cell B preferentially use the frequency band of the subband as the overlapping portion.
- Dispatch business When the load of cell A and cell B is lighter (below the load threshold), the 10M bandwidth of subband 1 is not overlapped enough to bear the load of cell A, and the 10M bandwidth of subband 2 is not enough to bear cell B.
- cell A and cell B may use only non-overlapping portions of the respective sub-bands to reduce co-channel interference between cells.
- the cell A When the load of the cell A rises to not lower than the load threshold, the cell A can use the entire sub-band 1. If the cell B is lower than the load threshold, the cell B can continue to use the right side of the sub-band 2 10M bandwidth.
- the service priorities to be scheduled in the cell 1 are arranged in descending order, and the services in the sub-band 1 that are not overlapped in the frequency band are scheduled to have high priority.
- the services of the high-priority priority are transmitted on the resources with the same low-frequency interference to ensure the correct execution of the high-priority services.
- Step 205 The cell schedules the service by using the frequency band of the non-overlapping part, and ends.
- Step 206 The cell whose load is not lower than the bearer threshold uses the frequency band scheduling service of the non-overlapping part of the allocated sub-band to have a higher priority than the frequency band scheduling service using the overlapping part, and ends.
- a larger frequency reuse factor can be supported in a case where the total available frequency band is smaller, and the utilization rate of the system frequency is improved; and, according to the correlation between the sub-bands, according to the correlation
- the sub-band is properly allocated for the cell, the cell with smaller load is required to be used. Resources in the subband that do not overlap with subbands of other neighboring cells, so as to further reduce co-channel interference between cells; require that cells with larger bearers preferentially use subbands that do not overlap with other neighboring cells.
- Sub-bands have overlapping resources to schedule high-priority services, and use resources in the sub-band overlapping with sub-bands of other neighboring cells to schedule low-priority services, so that high-priority services can have low co-channel interference. Transfer on resources to ensure the correct execution of high-priority services.
- the process of self-band division and sub-band allocation to the cell is foreseeable, and the network does not dynamically change, and the scheduling algorithm is also easy to implement.
- FIG. 10 to FIG. 12 The advantages of the first embodiment and the second embodiment of the present invention are illustrated in FIG. 10 to FIG. 12, and FIG. 10 to FIG. 12 are exemplary illustrations of the first embodiment and the second embodiment, which are not limited to the embodiments of the present invention. .
- the total available frequency band assumed in Figure 10 ⁇ 12 is 30MHz, divided into three sub-bands, each sub-band occupies a bandwidth of 20M, where sub-band 1 is allocated to cell A, sub-band 2 is allocated to cell B, sub-band 3 is allocated to cell C, and cells A, B, and C are neighbor cells of the same site.
- the Physical Downlink Control Channel (PDCCH), Physical HARQ Indicator Channel (PHICH), or Physical Control Format Indicator Channel (PCFICH) occupies the entire subband of the cell.
- the implementation of the present invention is compared with the networking mode 2 shown in FIG. After the networking mode of the example, the intra-cell co-channel interference received by the PDCCH is smaller than the inter-cell co-channel interference received in the networking mode 2 shown in FIG. 2 .
- the occupancy of the PHICH and the PCFICH in the subband is the same as that of the PDCCH, and will not be described here.
- the broadcast channel (PBCH) and the synchronization channel (SS) occupy the middle portion of each cell allocation subband, and the width is 1.08 MHz
- the physical downlink shared channel (PDSCH) occupies the PBCH and SS except the 1.08 MHz in the subband. Outside the frequency band.
- the frequency bands occupied by the PBCH and the SS of the neighboring cells A, B, and C are orthogonal to each other. Since the PDSCH occupies the frequency band other than 1,08 MHz, the PDSCH is rarely used for information transmission when the cell is loaded. Therefore, the co-channel interference between the adjacent cells A, B and C on the PBCH and SS is small.
- the physical uplink control channel occupies both ends of the entire subband of the cell.
- the frequency band, the physical uplink shared channel (PUSCH) occupies other frequency bands than the PUCCH.
- the frequency bands occupied by the PUCCHs of the adjacent cells A, B, and C are orthogonal to each other, when the cell bearer is small, the PUSCH is rarely used for information transmission, and therefore, the PUCCH of each cell is received by the same cell.
- the frequency interference is small.
- the PBCH/SS of the neighboring cell and the PDSCH are completely coincident (that is, in the same frequency band).
- the PDSCH is rarely used for information transmission, and the PBCH/SS is subjected to the same frequency.
- the interference is small.
- the cell bearer is large, when the PBCH/SS and the PDSCH of the neighboring cell are in the same frequency band and are simultaneously transmitted, the co-channel interference between the PBCH/SS and the PDSCH of the neighboring cell is Will appear, and even seriously affect the performance of PBCH / SS.
- the PUCCH of the neighboring cell is completely coincident with the PUSCH (that is, in the same frequency band).
- the PUSCH is rarely used for information transmission, and the PUCCH receives less co-channel interference, but
- the bearer of the cell is large, when the PUCCH and the PUSCH of the neighboring cell are in the same frequency band and are simultaneously transmitted, the co-channel interference between the PUCCH and the PUSCH of the neighboring cell may occur, and the PUCCH may be seriously affected. performance.
- the third embodiment and the fourth embodiment of the present invention respectively provide a networking optimization scheme for the downlink channel and a networking optimization scheme for the uplink channel, to solve the same frequency between the PBCH/SS and the PDSCH of the neighboring cell. Interference and the problem of co-channel interference between PUCCH and PUSCH of neighboring cells.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- the manner of reducing the co-channel interference between the PBCH/SS and the PDSCH of the neighboring cell in the third embodiment of the present invention includes, but is not limited to, the following two modes, which are respectively described below.
- Step 301 Determine, for any cell that has allocated a subband, from the subband allocated to the neighboring cell of the cell, the RB occupied by the designated downlink channel of the neighboring cell.
- the designated downlink channel in this embodiment includes a PBCH and/or an SS, and may also include other downlink channels. Since the PBCH/SS is generally located at the center of the subband, in this step, the center frequency of the neighboring cell and the bandwidth of the subband allocated to the neighboring cell may be allocated to the center in the subband of the neighboring cell.
- the RB occupied by the frequency band of the set length is used as the RB occupied by the designated downlink channel of the neighboring cell, and the frequency band of the set length may be the frequency band of the center of 1.08 MHz, that is, the frequency band of 0.54 MHz around the center point of the subband.
- the total available bandwidth is divided into 5 sub-bands, sub-band 1 and sub-band 2 are allocated to cell A, sub-band 3 is allocated to cell B, sub-band 4 and sub-band 5 are allocated to cell C.
- the cells A, B, and C are adjacent cells of the same site.
- the resource block (RB) occupied by the designated downlink channel in the subband 3 allocated by the cell B and the RB occupied by the designated downlink channel in the subband 4 and the subband 5 allocated by the cell C are determined.
- Step 302 Determine an RB occupied by the PDSCH in the subband allocated for the cell.
- FIG. 14( a ) the case where a plurality of sub-bands are allocated to at least one cell is taken as an example.
- the cell A is allocated two sub-bands, wherein the sub-band 1 and the sub-band 2 are both
- the steps shown in Figure 13 are performed separately to reduce co-channel interference between sub-band 1 and sub-band 2 and other sub-bands.
- the sub-band 1 is taken as an example.
- the RB occupied by the PDSCH except the hatched padding portion in the sub-band 1 in FIG. 14(a) is determined.
- Step 303 Select, from the RBs occupied by the PDSCH, RBs that do not overlap with the RBs occupied by the designated downlink channel of the neighboring cell (ie, RBs orthogonal to the designated downlink channel of the neighboring cell).
- subband 1 in FIG. 14(a) it is necessary to select an RB orthogonal to PBCH/SS of subband 3, subband 4, and subband 5 from the RB occupied by the PDSCH of subband 1, due to the subband 1 and subband 5 are completely orthogonal. Therefore, this step actually selects an RB orthogonal to the PBCH/SS of the subband 3 and the subband 4 from the RB occupied by the PDSCH of the subband 1, that is, in FIG. 14(a) Part of the band in the labeled subband 1.
- Step 304 The PDSCH of the cell is carried by using the selected RB.
- the cell A When the cell A uses the PDSCH of the sub-band 1 to perform information transmission, the cell A preferentially utilizes the PDSCH of the selected RB to carry the cell A, and ensures that the PDSCH of the sub-band 1 and the sub-band 3 and the sub-band 5 simultaneously perform a message.
- the PDSCH of subband 1 has less co-channel interference to subband 3 and PBCH/SS of subband 5.
- the mode 2 for reducing co-channel interference between the PBCH/SS and the PDSCH of the neighboring cell includes the following steps:
- Step 401 Determine, for any cell that has allocated a subband, from the subband allocated to the neighboring cell of the cell, the RB occupied by the designated downlink channel of the neighboring cell.
- the cell B determines the sub-band allocated to the downlink specified 3
- Step 402 Determine, from the subbands allocated to the cell, RBs that overlap with the RBs occupied by the designated downlink channel of the neighboring cell.
- Fig. 14 (b) the RBs in the sub-band 1 which overlap with the RBs occupied by the PBCH /SS of the sub-band 3 and the sub-band 5 are determined, that is, the portion marked in Fig. 14 (b).
- Step 403 Reduce the determined scheduling priority or transmit power of the determined overlapping RB.
- the scheduling priority of the overlapping RBs determined in the subband 1 is reduced to a scheduling priority lower than other RBs of the subband 1, or the overlapping RBs determined in the subband 1 are
- the transmission power is reduced to be lower than the transmission power of the other RBs of the sub-band 1.
- the transmission power of the overlapped RB determined in the sub-band 1 can also be reduced to 0, which is not used for transmitting information.
- Step 404 Perform information transmission by using the subband with the priority or the transmit power adjustment.
- the cell A When the cell A uses the PDSCH of the subband 1 for information transmission, the cell A preferentially uses the RB orthogonal to the PBCH/SS of the subband 3 and the subband 5, so that the PDSCH of the subband 1 is subband 3 and the PBCH/SS of the subband 5 The same frequency interference is small.
- Figure 14 (a) and Figure 14 (b) are modes in which the frequency bands are continuously allocated, that is, multiple sub-bands allocated to the same cell occupy two consecutive frequency bands, and the priority point is the total occupied.
- the available frequency band is small.
- the scheme of the third embodiment of the present invention can also be applied to the manner in which the frequency bands are discontinuously allocated as shown in FIG. 14(c), in order to further reduce the same-frequency interference.
- the purpose is to make the RB occupied by the PDSCH of a certain cell and the RBs occupied by the PBCH/SS of the neighboring cell are mutually offset in frequency, so that the cell The interference between the PDSCH and the PBCH/SS of the neighboring cell is minimized.
- Embodiment 4 is a diagrammatic representation of Embodiment 4:
- the manner of reducing the co-channel interference between the PUCCH and the PUSCH of the neighboring cell in the fourth embodiment of the present invention includes, but is not limited to, the following two modes, which are respectively described below.
- the method 1 for reducing co-channel interference between PUCCH and PUSCH of a neighboring cell includes the following steps:
- Step 501 Determine, for any cell that has allocated the subband, the RB occupied by the PUCCH of the neighboring cell from the subband allocated to the neighboring cell of the cell.
- the PUCCH is located at the two ends of the subband. Therefore, in this step, the RB occupied by the PUCCH of the neighboring cell may be determined according to the center frequency of the neighboring cell and the bandwidth of the subband allocated to the neighboring cell.
- the specific approach is:
- the neighboring cells can mutually inform each other of the number of PUCCH RBs through the X2 or S1 interface in a static, semi-static or dynamic manner. For a certain cell, according to the center frequency of the neighboring cell and the bandwidth of the subband allocated to the neighboring cell, determine the RBs at both ends of the subband allocated to the neighboring cell, and then allocate M/2 of the two ends of the subband allocated to the neighboring cell.
- the RB is an RB occupied by the PUCCH of the neighboring cell.
- the total available bandwidth is divided into five sub-bands, sub-band 1 and sub-band 2 are allocated to the cell ⁇ , sub-band 3 is allocated to the cell B, and sub-band 4 and sub-band 5 are allocated to the cell C.
- Cells A, B, and C are neighboring cells of the same site.
- the RB occupied by the PUCCH in the subband 3 allocated by the cell B and the RB allocated in the subband 4 allocated by the cell C and the PUCCH in the subband 5 are determined.
- Step 502 Determine an RB occupied by a PUSCH in a subband allocated for the cell.
- This step is to determine the RB occupied by the PUSCH in subband 1 of Figure 17 (a).
- Step 503 Select, from the RBs occupied by the determined PUSCH, RBs that do not overlap with the RBs occupied by the PUCCH of the neighboring cell.
- subband 1 in FIG. 17(a) it is necessary to select an RB orthogonal to the PUCCH of subband 3 and subband 4 from the RBs occupied by the PUSCH of subband 1, that is, the subtitles in FIG. 17(a) Belt 1 Part of the band.
- Step 504 The PUSCH of the cell is carried by using the selected RB.
- the cell A When the cell A uses the PUSCH of the sub-band 1 to perform information transmission, the cell A preferentially utilizes the PUSCH of the selected RB bearer cell A to ensure that the PUSCH of the sub-band 1 and the sub-band 3 and the sub-band 5 simultaneously transmit information, and the sub-band 1
- the PUSCH has less co-channel interference to the PUCCH of subband 3 and subband 5.
- Step 601 Determine, for any cell that has allocated the subband, the RB occupied by the PUCCH of the neighboring cell from the subband allocated to the neighboring cell of the cell.
- This step is the same as step 501.
- Step 602 Determine, from the subbands allocated to the cell, RBs that overlap with the RBs occupied by the PUCCH of the neighboring cell.
- this step determines the occupation of PUCCH in sub-band 1 and sub-band 3 and sub-band 5.
- RB has overlapping RBs, which are the parts marked in Figure 17 (b).
- Step 603 Reduce the determined scheduling priority or transmit power of the determined overlapping RB.
- the scheduling priority of the overlapped RB determined in the subband 1 is reduced to be lower than the scheduling priority of the other RBs of the subband 1, or the transmission power of the overlapping RB determined in the subband 1 is lowered. Up to the transmission power of other RBs lower than the sub-band 1, in the extreme, the transmission power of the overlapped RB determined in the sub-band 1 can also be reduced to 0, which is not used for transmitting information.
- Step 604 Perform information transmission by using the subband with the priority or the transmit power adjustment.
- the cell A When the cell A uses the PDSCH of the subband 1 to perform information transmission, the cell A preferentially utilizes the RBs orthogonal to the PUCCHs of the subband 3 and the subband 5, so that the PUSCH of the subband 1 is compared with the PUCCH of the subband 5 by the same frequency interference. small.
- Figure 17 (a) and Figure 17 (b) are methods of continuous allocation of frequency bands
- the scheme of the fourth embodiment of the invention can also be applied to the manner in which the frequency bands are discontinuously allocated as shown in Fig. 17(c).
- Embodiment 5 :
- the third embodiment is an optimization scheme for reducing the interference between the downlink channels
- the fourth embodiment is an optimization scheme for reducing the interference between the uplink channels.
- the fifth embodiment further provides an interference reduction function that can be applied to both the uplink channel and the downlink channel. Program.
- the method for reducing co-channel interference between adjacent cells in the fifth embodiment includes the following steps:
- Step 701 Receive, for any cell that has been allocated a subband, an overload indicator (OI) information sent by another neighboring cell.
- OI overload indicator
- the OI information of each RB has two bits, which is used to indicate the size of the interference that the RB is subjected to, such as indicating that the RB is subjected to high, medium, and low interference.
- each cell After determining the OI information of each RB of the occupied subband, each cell sends the OI information to the adjacent one or more cells.
- Step 702 Determine, in the subband allocated to the neighboring cell, the RB that the interference meets the set condition. Assume that the OI information of the cell B received by the cell A is as shown in FIG. 20, and the OI information carries the interference size of 10 RBs in the subband occupied by the cell B. When the setting condition is that the RB is subjected to high interference, in this step, the cell A determines that the received 01 information, and RB_B2 and RB_B3 are subjected to high interference.
- Step 703 Determine, from the subbands allocated to the cell, RBs that overlap with the RBs whose interference meets the set condition.
- the cell A compares the subbands occupied by the cell A, and determines that the RBs overlapping with the RB_B2 and the RB_B3 are RB_A4 and RB_A5.
- Step 704 Decrease the determined scheduling priority or transmit power of the overlapped RB.
- Step 705 Perform information transmission by using the subband with the priority or the transmit power adjustment.
- the RBs involved in the third, fourth, and fifth embodiments of the present invention include 14 OFDM symbols. Regardless of the manner of reducing the same-frequency interference, the RB determined in each step may not be a complete RB, but A partial RB containing less than 14 OFDM symbols, therefore, when the determined RB is a partial RB containing less than 14 OFDM symbols, the remaining OFDM symbols of the determined partial RB may be padded to obtain a completed RB.
- step 402 among the RBs that are overlapped with the RBs occupied by the PBCH/SS of the subband 3 and the subband 5 determined in the subband 1, 10 OFDM symbols and subbands 3 and 5 of the RBs
- the RBs occupied by the PBCH/SS overlap, and the remaining 4 OFDM symbols do not overlap with the RBs occupied by the PBCH/SS of the subband 3 and the subband 5. Since RB is the smallest unit of channel transmission, 4 non-overlapping units can be used.
- the OFDM symbol together with the overlapping 10 OFDM symbols serves as RBs overlapping the RBs occupied by the PBCH/SS of the subband 3 and the subband 5.
- the sixth embodiment of the present invention provides a frequency multiplexing networking device.
- the device includes a dividing module 11 and an allocating module 12, where: the dividing module 11 is configured to divide the total available frequency bands of the system into multiple The sub-bands are used to allocate the sub-bands obtained by the partition to each cell, wherein at least two cell-assigned sub-bands overlap.
- the allocation module 12 is specifically configured to allocate one sub-band to each cell; or, allocate multiple sub-bands for at least one cell, and allocate multiple sub-bands of the same cell, and any two sub-bands have no overlap.
- the allocation module 12 includes a correlation determination sub-module 21 and an execution sub-module 22, wherein: the correlation determination sub-module 21 is configured to determine a correlation between each sub-band, wherein an overlapping portion of any two sub-bands The greater the ratio of the bandwidth occupied by the two sub-bands to the total bandwidth, the greater the correlation between the two sub-bands; the execution sub-module 22 is configured to allocate the sub-bands according to the correlation between the sub-bands. For each cell, the closer the physical distance between the two cells, the less the correlation between the sub-bands allocated to the two cells.
- the device further includes a load determining module 13 and a scheduling module 14, wherein: the load determining module 13 is configured to determine a load of the neighboring cell for the neighboring cells with overlapping sub-bands; When the load of the neighboring cell is lower than the load threshold, the neighboring cell is instructed to use the non-overlapping part of the frequency band scheduling service, and when the load of any cell is not lower than the load threshold, indicating The priority of the frequency band scheduling service in which the cell uses the non-overlapping portion of the allocated sub-band is higher than the priority of the frequency band scheduling service using the overlapping portion.
- the apparatus of the sixth embodiment has functional modules for implementing the third embodiment to the fifth embodiment in addition to the configuration shown in Fig. 21, which will be separately described below.
- the mode 1 for reducing the co-channel interference between the PUCCH and the PUSCH of the neighboring cell shown in FIG. 16 in the fourth embodiment includes the following functional modules in the device of the sixth embodiment:
- a neighboring cell RB determining module a neighboring cell RB determining module, an RB selecting module, and an indicating module, where:
- the neighboring cell RB determining module is configured to determine, according to any cell of the allocated subband, the RB occupied by the PUCCH of the neighboring cell from the subband allocated to the neighboring cell of the cell;
- An RB selection module configured to determine a physical uplink shared channel in a subband allocated for the cell
- An RB that is occupied by the PUSCH, and an RB that does not overlap with the RB occupied by the PUCCH is selected from the RBs occupied by the PUSCH;
- the indication module is configured to instruct the cell to use the selected RB to carry the PUSCH.
- the following functional modules are included in the device of the sixth embodiment:
- Neighboring cell RB determining module, RB selecting module and adjusting module wherein:
- a neighboring cell RB determining module configured to determine, according to any cell of the allocated subband, an RB occupied by a PUCCH of the neighboring cell from a subband allocated to the neighboring cell of the cell;
- An RB selection module configured to determine, from a subband allocated for the cell, an RB that overlaps with an RB occupied by a PUCCH of a neighboring cell;
- an adjusting module configured to reduce the determined scheduling priority of the overlapped RBs to a scheduling priority lower than other RBs in the subband allocated for the cell, or the determined overlapping RBs to be determined The transmit power is reduced below the transmit power of the other RBs in the subband allocated for the cell.
- the neighboring cell RB determining module in the foregoing 1, 2 is specifically configured to determine, according to a center frequency point of the neighboring cell and a bandwidth of a subband allocated to the neighboring cell, RBs allocated to the two ends of the subband of the neighboring cell, and
- the number of RBs occupied by the PUCCH of the neighboring cell is the number of RBs occupied by the PUCCH of the neighboring cell.
- the information receiving module is configured to receive, according to any cell of the allocated subband, the OI information of the over-delivery indication sent between the neighboring cells, where The OI information includes the interference size of each RB in the subband allocated for the neighboring cell;
- a neighboring cell RB determining module configured to determine, in the subband allocated to the neighboring cell, the RB that is subjected to the interference to meet the set condition
- An RB selection module configured to determine, from a subband allocated for the cell, an RB that overlaps with an RB that is subjected to the interference satisfying the set condition
- an adjusting module configured to reduce the determined scheduling priority of the overlapped RBs to a scheduling priority lower than other RBs in the subband allocated for the cell, or the determined overlapping RBs to be determined The transmit power is reduced below the transmit power of the other RBs in the subband allocated for the cell.
- the following functional modules are included in the device of the sixth embodiment:
- a neighboring cell RB determining module a neighboring cell RB determining module, an RB selecting module, and an indicating module, where:
- a neighboring cell RB determining module configured to determine, from the subband allocated to the neighboring cell of the cell, the RB occupied by the designated downlink channel of the neighboring cell, for any cell that has allocated the subband;
- An RB selection module configured to determine, according to the RB allocated by the PDSCH, the RB that is occupied by the PDSCH, and select an RB that does not overlap with the RB occupied by the specified downlink channel, and the indication module is used to indicate the RB.
- the cell carries the PDSCH by using the selected RB.
- the following functional modules are included in the device of the sixth embodiment:
- Neighboring cell RB determining module, RB selecting module and adjusting module wherein:
- a neighboring cell RB determining module configured to target any cell of the allocated subband, from the cell to the cell In the subband allocated by the neighboring cell, determining the RB occupied by the designated downlink channel of the neighboring cell;
- An RB selection module configured to determine, from a subband allocated for the cell, an RB that overlaps with an RB occupied by a designated downlink channel of the neighboring cell;
- an adjusting module configured to reduce the determined scheduling priority of the overlapped RBs to a scheduling priority of other RBs in the subband allocated for the cell, or the determined overlapping RBs to be determined The transmit power is reduced below the transmit power of the other RBs in the subband allocated for the cell.
- the neighboring cell RB determining module in the foregoing 4, 5 is specifically configured to determine, according to a center frequency point of the neighboring cell and a bandwidth of a subband allocated to the neighboring cell, a frequency band set in the center of the subband allocated to the neighboring cell.
- the occupied RB is used as the RB occupied by the designated downlink channel of the neighboring cell, and the frequency band of the set length may be a frequency band of 1.08 MHz.
- the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
- the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for making a
- the terminal device (which may be a cell phone, a personal computer, a server, or a network device, etc.) performs the methods described in various embodiments of the present invention.
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JP2012551476A JP5536235B2 (ja) | 2010-02-03 | 2011-01-31 | 周波数再利用ネットワーキング方法および機器 |
US13/576,715 US20130021999A1 (en) | 2010-02-03 | 2011-01-31 | Networking method and device for frequency reuse |
KR1020127022337A KR101468789B1 (ko) | 2010-02-03 | 2011-01-31 | 주파수 재사용 네트워크 방법, 및 설비 |
EP11739339.7A EP2533557B1 (en) | 2010-02-03 | 2011-01-31 | Networking method and device for frequency reuse |
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CN201019114021.5 | 2010-02-03 | ||
CN2010191140215A CN102143500A (zh) | 2010-02-03 | 2010-02-03 | 一种小区带宽配置方法和设备 |
CN201010268723.1 | 2010-08-31 | ||
CN2010102687231A CN102386989A (zh) | 2010-08-31 | 2010-08-31 | 一种频率复用组网方法和系统 |
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JP2014165647A (ja) * | 2013-02-25 | 2014-09-08 | Kyocera Corp | 無線通信システム、無線通信システムの制御方法、基地局および移動局 |
CN106793098A (zh) * | 2016-04-01 | 2017-05-31 | 北京展讯高科通信技术有限公司 | 空口帧结构框架及其配置方法、基站 |
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US9553680B1 (en) * | 2012-04-02 | 2017-01-24 | Sprint Communications Company L.P. | Uplink interference mitigation |
US10039116B1 (en) | 2012-04-02 | 2018-07-31 | Sprint Communications Company L.P. | Long term evolution scheduler to mitigate interference |
WO2014119246A1 (ja) | 2013-01-29 | 2014-08-07 | 京セラ株式会社 | 通信システム、通信方法、及び通信装置 |
JP6091227B2 (ja) * | 2013-01-29 | 2017-03-08 | 京セラ株式会社 | 通信システム、通信方法、及び通信装置 |
JP2014146994A (ja) * | 2013-01-29 | 2014-08-14 | Kyocera Corp | 通信システム、通信方法、及び通信装置 |
CN106102076B (zh) * | 2016-06-15 | 2020-11-13 | 惠州Tcl移动通信有限公司 | 一种用于室内覆盖网络的自适应频率调节方法及系统 |
KR102475187B1 (ko) | 2017-11-16 | 2022-12-06 | 텔레폰악티에볼라겟엘엠에릭슨(펍) | 무선 통신 네트워크에서의 사용자 장비, 네트워크 노드 및 방법 |
US10667258B2 (en) * | 2017-12-12 | 2020-05-26 | Nec Corporation | System and method for improving transmission in wireless networks |
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JP2013519269A (ja) | 2013-05-23 |
KR20120127472A (ko) | 2012-11-21 |
JP5536235B2 (ja) | 2014-07-02 |
KR101468789B1 (ko) | 2014-12-03 |
EP2533557B1 (en) | 2018-06-06 |
EP2533557A1 (en) | 2012-12-12 |
EP2533557A4 (en) | 2016-11-23 |
US20130021999A1 (en) | 2013-01-24 |
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