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    • 专利摘要:
    METHOD, DEVICE, BASE STATION AND USER EQUIPMENT TO REDUCE INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM. The present invention relates to a method and an apparatus, base station and user equipment for reducing interference in a wireless communication system are provided in the present invention. The wireless communication system comprises a first cell and a second cell, wherein the uplink/downlink substructure configuration of the first cell and the second cell is asymmetrical and may result in implementing a first type of substructure in the first cell while implements a second type of substructure different from the first type of substructure in the second cell, thereby producing intercellular interference. The method comprises: mapping a resource grid of at least one of the substructure type and of the second substructure type to reserve at least one of a resource element in the first substructure type and that corresponding to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel and a resource element in the second substructure type and corresponding to (...).
    公开号:BR112013024807B1
    申请号:R112013024807-6
    申请日:2012-03-28
    公开日:2022-02-01
    发明作者:Xiaobo Zhang
    申请人:Alcatel Lucent；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [0001] The present invention relates to the field of communication, and more particularly, it relates to a method, an apparatus, a base station and user equipment for reducing interference in a wireless communication system. BACKGROUND OF THE INVENTION
    [0002] Theoretically speaking, a Long Term Evolution (LTE TDD) Evolution Time Division Duplex system can develop different uplink/downlink subframe configuration for adjacent cells, which is claimed as one of the important advantages. However, developing different uplink/downlink substructure configuration for adjacent cells will result in implementing an uplink substructure in a first cell while implementing a downlink substructure in a second cell, thereby producing intercell interference. Intercell interference could be disastrous for the system. The inter-cell interference thus produced can be divided into an interference from an uplink User Equipment (UE) to a downlink UE and an interference from a downlink base station, for example, an Evolved Node B (eNB) in a uplink eNB. How to reduce inter-cell interference was addressed by several documents.
    [0003] It is an object of the present invention to provide a new scheme to reduce or even eliminate inter-cell interference that results from developing different configuration of uplink/downlink substructure for adjacent cells. SUMMARY OF THE INVENTION
    [0004] In accordance with the first aspect of the present invention, there is provided a method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which uplink substructure configuration /downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the method comprising: mapping a resource grid of at least one of the first substructure type and the second substructure type to reserve at least one of a resource element in the first subframe type and which corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, and a rec element bear in the second type of substructure that corresponds to a resource element in the first type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information; and transmit a mapping result of the mapping step.
    [0005] According to the second aspect of the present invention, there is provided an apparatus for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which uplink substructure configuration /downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the device comprising: a mapper configured to map a resource grid of at least one of the first substructure type and the second substructure type to reserve at least one of: a resource element in the first substructure type that corresponds to a resource element in the second substructure type substructure and mapped to at least one of a reference signal and a co channel common control, and a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, so as not to transmit information; and a transmitter configured to transmit a mapping result from the mapper.
    [0006] According to the third aspect of the present invention, there is provided a method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which the link substructure configuration uplink/downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the method comprising: receiving information related to mapping of a resource grid of the first type of substructure or information related to mapping of a grid of resource of the second type of substructure, in which the resource grid of the first type of substructure is mapped as reserving a resource element in the first type of substructure and which corresponds to a re element course in the second substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information and the resource grid of the second substructure type is mapped as reserving a resource element in the second substructure type and which corresponds to a resource element in the first type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [0007] According to the fourth aspect of the present invention, there is provided a base station for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which link substructure configuration uplink/downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the base station comprising: a receiver configured to receive information relating to mapping a feature grid of the first type of substructure or information relating to mapping a grid feature of the second type of substructure, in which the feature grid of the first type of substructure is mapped as reserving a resource element in the first substructure type ura that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information, and the resource grid of the second substructure type is mapped as reserving an element resource in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [0008] According to the fifth aspect of the present invention, there is provided a method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which uplink substructure configuration /downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the method comprising: receiving information related to mapping a resource grid of the second substructure type; mapping a resource grid of the first substructure type to reserve a resource element in the first substructure type and which corresponds to a resource element in the second substructure type and mapped for at least one of a reference signal and a con channel common trolley, not to transmit information.
    [0009] According to the sixth aspect of the present invention, there is provided a base station for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which the substructure configuration of uplink/downlink of the first cell and second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the base station comprising: a receiver configured to receive information related to mapping a resource grid of the second substructure type; a mapper configured to map a resource grid of the first substructure type to reserve a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00010] According to the seventh aspect of the present invention, user equipment is provided for reducing interference in a wireless communication system, the wireless communication system comprising a first cell and a second cell, in which link substructure configuration uplink/downlink of the first cell and the second cell is asymmetric and may result in implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, thereby producing intercell interference, the user equipment comprising: a receiver configured to receive information relating to mapping a feature grid of the first type of substructure or information relating to mapping a feature grid of the second type of substructure, in which the feature grid of the first type of substructure is mapped as reserving a resource element in the first type of substructure that corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information; and the resource grid of the second substructure type is mapped as reserving a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00011] In accordance with the present invention, once you reserve at least one of a resource element in the first type of substructure and that corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel and a resource element in the second type of substructure and which corresponds to a resource element in the first type of substructure and mapped to at least one of a reference signal and a common control channel, so as not to transmit information, intercell interference of at least one of a reference signal and a common control channel can be reduced, thereby significantly improving system performance. Brief description of drawings
    [00012] Other objects and effects of the present invention will become clearer and easier to understand by referring to the following description in conjunction with the accompanying drawings, together with a more complete understanding of the present invention, in which
    [00013] FIG. 1 illustrates a wireless communication system where the present invention may be embodied.
    [00014] FIGS. 2A and 2B illustrate an LTE TDD frame structure according to the prior art.
    [00015] FIG. 3 illustrates an LTE TDD resource grid skeleton according to the prior art.
    [00016] FIG. 4 illustrates a flowchart of a method for reducing interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell in a wireless communication system, in accordance with a embodiment of the present invention.
    [00017] FIG. 5 illustrates a block diagram of an apparatus for implementing steps of the method illustrated in FIG. 4 in accordance with an embodiment of the present invention.
    [00018] FIG. 6 illustrates a flowchart of a method for reducing interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell in a wireless communication system according to an embodiment of the present invention.
    [00019] FIG. 7 illustrates a block diagram of a base station for implementing steps of the method illustrated in FIG. 6 in accordance with an embodiment of the present invention.
    [00020] FIG. 8A and FIG. 8B illustrate mapping a resource grid into a downlink substructure and an uplink substructure in accordance with an embodiment of the present invention.
    [00021] In all accompanying drawings, the same reference signs represent identical, similar or corresponding aspects or functions. Detailed description of modalities
    [00022] Embodiments of the present invention will be described in detail below, with reference to the accompanying drawings.
    [00023] FIG. 1 illustrates a wireless communication system where the present invention may be embodied.
    [00024] As illustrated in FIG. 1, wireless communication system 100 comprises a first base station 110 that corresponds to a first cell, a second base station 120 that corresponds to a second cell, and user equipment 130 and 140.
    [00025] The first base station 110 provides a first coverage band 110-a and the second base station 120 provides a second coverage band 120-a.
    [00026] Here, user equipment 130 is admitted within the first coverage range 110-a. Thus, user equipment 130 communicates with first base station 110 over a wireless link 150. User equipment 140 is admitted within the second coverage range 120-a. Thus, user equipment 140 communicates with second base station 120 over wireless link 160. In addition, first base station 110 communicates with second base station 120 over backhaul link 170. return 170 can be wired and can also be wireless.
    [00027] Here it is assumed that the first base station 110 and the second base station 120 are eNBs of the LTE TDD system, and it is also assumed that the first base station 110 and the second base station 120 are base stations of adjacent cells.
    [00028] FIGS. 2A and 2B illustrate a skeleton LTE TDD structure according to the prior art. The skeleton framework illustrated in FIGS. 2A and 2B comprises 10 subframes that include subframe 0, subframe 1, subframe 2, subframe 3, subframe 4, subframe 5, subframe 6, subframe 7, subframe 8 and subframe 9. The difference is that the frame skeleton illustrated in FIG. 2A comprises two special subframes, i.e., subframe 1 and subframe 6, while the frame skeleton illustrated in FIG. 2B only comprises one main subframe, i.e. subframe 1. Special subframe has three special time slots: Special subframe has time slot special downlink pilot multiplexer (DwPTS) channel, special pilot multiplexer channel downlink (DwPTS), loss protection interval (GP) protection interval, uplink pilot multiplexer (UpPTS) special channel time interval.
    [00029] The ten subframes employ a unified subframe length of 1 ms (which corresponds to the minimum TTI transmission time interval). The conventional substructure comprises two special 0.5 millisecond multiplexer channels.
    [00030] According to the frequency of occurrence of the special subframe, the LTE TDD frame skeleton can be divided into two types, namely a 5 ms period frame skeleton and a 10 ms period frame skeleton. So what is illustrated in FIG. 2A is a 5 ms period frame skeleton and what is illustrated in FIG. 2B is a 10 ms period frame skeleton.
    [00031] The 5 ms period frame skeleton divides a 10 ms wireless frame into two 5 ms half frames that have completely identical frame and the same uplink/downlink subframe ratio.
    [00032] Taking the conventional cyclic suffix (Cyclic Postfix) (CP) as an example, as the conventional substructure, the special substructure will also comprise 14 orthogonal frequency division multiplexing (OFDM) symbols.
    [00033] In 5 subframes subframes included in a half frame of the 5ms period frame frame, except for a special subframe, in which the special subframe always comprises a downlink DwPTS, an uplink UpPTS and a GP, the ratio between the downlink subframes and the uplink subframes in the remaining four conventional subframes may be 3:1, 2:2 or 1:3.
    [00034] In 10 subframes included in a 10 ms period frame skeleton wireless frame, except one special subframe, the relationship between the downlink subframes and the uplink subframes in the remaining 9 conventional subframes, may be 8 :1, 7:2, 6:3 or 3:5, a 10 ms wireless frame comprises two special subframes. Although in the last configuration it is split into two half-frames, the two half-frames have different uplink/downlink ratios and so the period is still 10 ms.
    [00035] Table 1 summarizes the uplink/downlink subframe configuration in the frame skeleton.


    [00036] Where D represents a downlink substructure, U represents an uplink substructure, S represents a special substructure.
    [00037] The LTE TDD system has a maximum bandwidth of 20Mhz, and can be configured to have a bandwidth of 20M, 15M, 10M, 5M, 3M or 1.4M.
    [00038] LTE TDD system allocates resources by allocating resource blocks (RB). Different bandwidths correspond to different number of allocated RBs. By means of an equation of:number RB*12*subcarrier interval = bandwidth.the number of RBs can be derived in case other parameter values are known.
    [00039] FIG. 3 illustrates an LTE TDD resource grid structure according to the prior art.
    [00040] FIG. 3 illustrates a resource grid structure of the first multiplexer channel of subframe 0. Each RB 305 is a block of resources and, in terms of time, contains a resource in the time domain occupied by a multiplexer channel in a subframe, i.e. , 7 OFDM symbols, while in terms of frequency, it contains a resource in the frequency domain occupied by 12 subcarriers. The resource occupied by a subcarrier in an OFDM symbol is called as a resource element (RE) as represented by 310. Thus, in a normal cyclic suffix (CP) mode, 1 RB = 12*7 REs.
    [00041] Surely those skilled in the art can understand that the second multiplexer channel of subframe 0, and the first multiplexer channel and the second multiplexer channel of other conventional subframes and special subframe have the same feature grid structure as illustrated in FIG. . 3.
    [00042] As described above, LTE TDD system may develop different downlink/downlink substructure configuration for adjacent cells.
    [00043] This means that the first base station 110, which corresponds to the first cell, can develop any uplink/downlink configuration in configurations 0-6 as shown in Table 1 and the second base station 120, which corresponds to the second cell, can also develop any uplink/downlink configuration in configurations 0-6 as shown in Table 1, so that the uplink/downlink substructure configuration of the first base station 110 and that of the second base station 120 can be asymmetric, which may result in implementing a downlink substructure in the first cell while implementing an uplink substructure or a special substructure in the second cell, or results in implementing an uplink substructure or a special substructure in the first cell while implementing a downlink substructure in the second cell thereby producing ing intercell interference.
    [00044] In the following descriptions it is admitted to implement a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell, in which the first type of substructure can be a downlink substructure, a uplink substructure or a special substructure. Likewise, the second type of substructure can be a downlink substructure, an uplink substructure, or a special substructure.
    [00045] FIG. 4 illustrates a flowchart of a method for reducing interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell in a wireless communication system according to an embodiment of the present invention.
    [00046] As illustrated in FIG. 4 method 400 comprises step S 410: mapping a resource grid of at least one of the first substructure type and of the second substructure type to reserve at least one of a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, and a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a substructure type reference and a common control channel, not to transmit information; and
    [00047] Step S 420: transmit a mapping result of the mapping step S 410.
    [00048] The method illustrated in FIG. 4 is applicable to a low latency, centralized scheduling scenario, for example, a 2/3/4 remote radio head (RRH) based scenario on 3GPP R1-110598, where the first base station 110 and the second base station 120, for example, are RRH. In the above scenario, a device, for example a base station resource allocation module not shown in FIG. 1 is used to implement the steps of the method illustrated in FIG. 4, i.e. centrally mapping a resource grid to each cell, to reserve at least one of: a resource element in the first substructure type that corresponds to a resource element in a second substructure type and mapped to at least one a reference signal and a common control channel, and a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, to not transmit information.
    [00049] FIG. 5 illustrates a block diagram of an apparatus for implementing steps of the method illustrated in FIG. 4 in accordance with an embodiment of the present invention.
    [00050] As illustrated in FIG. 5, apparatus 500 comprises: a mapper 510 configured to map a resource grid of at least one of the first substructure type and the second substructure type to reserve at least one of a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, and a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a signal reference and a common control channel, not to transmit information; and a transmitter 520 configured to transmit a mapping result from the mapper 510.
    [00051] For example, in one embodiment of the present invention the transmitter 520 transmits a mapping result from the mapper 510 to the first and second base stations 110 and 120, and then the first and second base stations 110 and 120, respectively, transmit the mapping result for your 130 and 140 user equipment.
    [00052] In another embodiment of the present invention the transmitter 520 still transmits a mapping result from the mapper 510 to the user equipment 130 and 140 of the first and second cells.
    [00053] Correspondingly, according to an embodiment of the present invention, the base station can implement the step of: receiving information related to mapping a resource grid of the first type of substructure or information related to mapping a resource grid of the second substructure type, in which the resource grid of the first substructure type is mapped as reserving a resource element in the first substructure type and which corresponds to a resource element in the second substructure type and mapped to at least one of a reference sign and a common control channel to not transmit information, and the resource grid of the second substructure type is mapped as reserving a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00054] In the case where the first base station 110 and the second base station 120, respectively, transmit the information related to mapping the resource grid of the first substructure type and the information related to mapping the resource grid of the second type of substructure to its user equipment 130 and 140, the base station can implement the step of: transmitting received information related to resource grid mapping of the first substructure type or information related to resource grid mapping of the second substructure type.
    [00055] Correspondingly, according to an embodiment of the present invention, the base station may comprise: a receiver configured to receive information related to mapping a resource grid of the first type of substructure or information related to mapping a resource grid of the second substructure type, in which the resource grid of the first substructure type is mapped as reserving a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference sign and a common control channel to not transmit information, and the resource grid of the second substructure type is mapped as reserving a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00056] And correspondingly, in the case where the first and second base stations, respectively, transmit information related to resource grid mapping of the first substructure type and information related to resource grid mapping of the second substructure type to its user equipment, the base station may comprise: a transmitter configured to transmit received information relating to grid mapping feature of the first substructure type or information relating to grid mapping feature of the second substructure type.
    [00057] FIG. 6 illustrates a flowchart of a method for reducing interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell in a wireless communication system according to an embodiment of the present invention.
    [00058] The method illustrated in FIG. 6 is applicable to a high latency, distributed programming scenario, eg inter e-NB or domestic eNB and eNB. In the above scenario, without loss of generality, the first base station 110, as shown in FIG. 1, is used to implement steps of the method illustrated in FIG. 6 to reserve a resource element in the first type of substructure and which corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00059] Of course, those skilled in the art can understand that the second base station 120 shown in FIG. 1 can implement steps that correspond to the steps of the method illustrated in FIG. 6 which is not described in detail for brevity.
    [00060] As illustrated in FIG. 6 the method comprises step S 610: receiving information related to mapping a resource grid of the second substructure type, and steps S 620: mapping the resource grid of the first substructure type to reserve a resource element in the first substructure type that corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel, so as not to transmit information.
    [00061] As illustrated in FIG. 6 method 600 may further comprise step S 630: transmitting information related to mapping a resource grid of the first type of the substructure.
    [00062] For example, information related to mapping the resource grid of the first type of substructure can be transmitted to the user equipment 130 in the first cell and the second base station 120.
    [00063] FIG. 7 illustrates a block diagram of a base station for implementing steps of the method illustrated in FIG. 6 in accordance with an embodiment of the present invention.
    [00064] The base station, for example, is the first base station 110 shown in FIG. 1. Of course, those skilled in the art can understand that the second base station 120 shown in FIG. 1 may have an apparatus that corresponds to the apparatus had by the base station shown in FIG. 7, which is not described in detail here for brevity.
    [00065] As illustrated in FIG. 7, base station 700 comprises a receiver 710 configured to receive information related to mapping a resource grid of the second type of substructure and a mapper 720 configured to map the resource grid of the first type of substructure to reserve a resource element in the first type of substructure. substructure that corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00066] As illustrated in FIG. 7, base station 700 may further comprise a transmitter 730 configured to transmit information related to mapping a resource grid of the first type of substructure, e.g. transmitting information related to mapping of the resource grid of the first type of substructure to user equipment 130 in the first cell and the second base station 120.
    [00067] For example, the first base station 110 may receive, from the second base station 120 via the return link 170, information related to mapping a resource grid of the second type of the substructure such as the control format indicator channel physical (PCFICH configured to indicate the number (1, 2 or 3) of CFDM symbols for PDCCH transmission in a subframe), RS position, System Information Block (SIB)-2 position, single radio frequency network configuration simultaneous broadcast, SRS position, etc.
    [00068] Since PCFICH is dynamically adjustable, and its adjustment speed is slow, in one embodiment of the present invention the PCFICH may not be used, and to ensure that interference in the PDCCH could be reduced to a minimum, an element resource corresponding to 3 predetermined OFDM symbols to be allocated to the PDCCH can always be reserved to not transmit information.
    [00069] Correspondingly, according to an embodiment of the present invention, user equipment can implement the step of:
    [00070] receive information related to mapping a resource grid of the first substructure type or information related to mapping a resource grid of the second substructure type, in which the resource grid of the first substructure type is mapped as reserving a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel to not transmit information, and the resource grid of the second substructure type is mapped as reserving a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel, so as not to transmit information.
    [00071] Correspondingly, according to an embodiment of the present invention, user equipment may comprise: a receiver configured to receive information related to mapping of a resource grid of the first type of substructure or information related to mapping of a resource grid of the second type substructure, in which the resource grid of the first substructure type is mapped as reserving a resource element in the first substructure type that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a channel of common control to not transmit information, and the resource grid of the second substructure type mapped as reserving a resource element in the second substructure type that corresponds to a resource element in the first substructure type and mapped to at least one of a reference signal and a common control channel for not transmitting information.
    [00072] In one embodiment of the present invention, in the case where the first type of substructure is a downlink substructure and the second type of substructure is a special substructure only map the resource grid of the first substructure type to reserve a resource element in the first type of substructure it corresponds to a resource element in the second type of substructure it is mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [00073] In an embodiment of the present invention, in the case where the first type of substructure is a downlink substructure and the second type of substructure is an uplink substructure, mapping the resource grid of the first substructure type to reserve a resource element in the first type of substructure and which corresponds to a resource element in the second type of substructure and mapping to at least one of a reference signal and a common control channel to not transmit information, comprises: mapping the resource grid of the first type substructure to reserve at least one of the following resource elements of the first substructure type to not transmit information: a resource element that corresponds to a resource element mapped to a PUCCH physical downlink control channel in the second substructure type; a resource element which corresponds to a resource element mapped to an UpPCH uplink pilot channel in the second type substructure; a resource element that corresponds to a resource element mapped to an SRS sound reference signal channel in the second substructure type; and a resource element that corresponds to a resource element mapped to an UL DMRS uplink demodulation reference signal in the second subframe type.
    [00074] Certainly those skilled in the art can understand that resource elements other than the resource elements previously mentioned in the first type of substructure may also be reserved not to convey information, or other resource elements instead of the resource elements previously mentioned in the first type of substructure , may be reserved not to transmit information.
    [00075] In addition, a resource element in the first substructure type that corresponds to the resource element in the second substructure type and mapped to the UL DMRS uplink demodulation reference signal or other uplink user equipment specific reference signals may be reserved to not transmit information only when a frequency division multiplexing (FDM) solution is used to handle the interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type of substructure in the second cell.
    [00076] In an embodiment of the present invention, in the case where the first type of substructure is a downlink substructure and the second type of substructure is an uplink substructure resource grid mapping of the second substructure type to reserve an element resource in the second type of substructure and which corresponds to a resource element in the first type of substructure and mapped to at least one of a reference signal and a common control channel for not transmitting information comprises: mapping the second type of substructure to reserve in the at least one of the following resource elements in the second type of substructure, in order not to transmit information: a resource element that corresponds to a resource element mapped to a PDCCH physical downlink control channel in the first type of substructure; a resource element that corresponds to a resource element mapped to a physical PBCH broadcast channel in the first type of substructure; a resource element that corresponds to a resource element mapped to a dynamic broadcast channel in the first substructure type; a resource element that corresponds to a resource element mapped to a CSI-RS channel state reference information signal in the first substructure type ;a resource element that corresponds to a resource element mapped to a CRS cell-specific reference signal in the first substructure type;a resource element that corresponds to a resource element mapped to a DL DMRS downlink demodulation reference signal in the first substructure type.
    [00077] Of course, those skilled in the art can understand that resource elements other than the previously mentioned resource elements in the second substructure type may also be reserved to not convey information, or other resource elements rather than those previously mentioned resource elements in the second type. substructure, may be reserved to not transmit information.
    [00078] In addition, a resource element in the second substructure type and which corresponds to the resource element in the first substructure type is mapped to the DL DMRS downlink demodulation reference signal or other link user equipment specific reference signals downstream may be reserved to not transmit information only when a frequency division multiplexing (FDM) solution is used to handle the interference that results from implementing a first type of substructure in the first cell while implementing a second type of substructure different from the first type. substructure in the second cell.
    [00079] In addition, when the downlink substructure employs the MBSFN configuration, it is necessary to reserve a resource element in the second substructure type that corresponds to the resource element in the first substructure type and mapped to a CRS cell-specific reference signal, not to transmit information.
    [00080] In addition, since some resource elements in the resource grid are reserved to not transmit information according to the present invention, the energy of the resource elements to transmit data in the resource grid should be increased so that a transmission energy of the uplink substructure remains the same as that of the other downlink substructures.
    [00081] FIG. 8A and FIG. 8B illustrate mapping a resource grid into a downlink substructure and an uplink substructure in accordance with an embodiment of the present invention in which FIG. 8A illustrates mapping a resource grid onto a downlink substructure in accordance with an embodiment of the present invention and FIG. 8B illustrates mapping a resource grid onto an uplink substructure in accordance with an embodiment of the present invention.
    [00082] As illustrated in FIG. 8A resource elements marked 1 are allocated to PDCCH; resource elements marked 2 are allocated to CSI-RS; resource elements marked 3 are allocated to CRS; Resource elements marked as R are reserved as not conveying information, while other resource elements not marked by a reference number or letter are used to transmit data.
    [00083] As illustrated in FIG. 8B, resource elements marked 1 are allocated to SRS; Resource elements marked as R are reserved as not conveying information, while other resource elements not marked by a reference number or letter are used to transmit data.
    [00084] It can be seen from FIG. 8A wherein resource elements in the downlink substructure and which correspond to resource elements in the uplink substructure and allocated to SRS are reserved for not transmitting information.
    [00085] It can be seen from FIG. 8B that resource elements in the uplink substructure and which correspond to resource elements in the downlink substructure and allocated to PDCCH, CRS and CSI-RS are reserved for not transmitting information.
    [00086] It should be noted that to make the present invention easier to understand, some more specific technical details which are well known to those skilled in the art and may be essential for implementing the present invention are omitted from the above descriptions.
    [00087] Hence, selecting and describing the modalities is to better explain the principle of the present invention and its actual application, and to make it clear to those of ordinary talent in the art that, without departing from the essence of the present invention, all modifications and changes fall within the scope of protection of the present invention, limited by the claims.
    [00088] In addition, those skilled in the art can understand that the steps of the various methods described above can be implemented by means of a programmed computer. Here, some embodiments seek to cover a program storage apparatus that is machine- or computer-readable, and coded with machine- or computer-executable instruction programs, in which the instruction implements some or all of the steps of the methods. The program storage apparatus may be, for example, a magnetic storage medium such as a magnetic disk, a magnetic tape, a hard disk drive, or an optically readable digital data storage medium. The modalities also seek to cover a computer programmed to implement the steps of the methods.
    权利要求:
    Claims (15)
    [0001]
    1. A method of reducing interference in a wireless communication system (100), the wireless communication system comprising a first cell (110-a) and a second cell (120-a), wherein the substructure configuration of uplink/downlink of the first cell (110-a) and second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) while implementing a different second type of substructure of the first type of substructure in the second cell (120-a), thereby producing intercellular interference, the method characterized in that it comprises: Mapping (410) a feature grid of at least one of the first type of substructure and the second type of substructure to reserve at least one of a first resource element in the first substructure type and which corresponds to a second resource element in the second substructure type and mapped to at least one of a first reference signal and a common control channel, and a third resource element in the second substructure type that corresponds to a fourth resource element in the first substructure type and mapped to at least one of a second reference signal and the common control channel, so as not to transmit information ; and transmit (420) a mapping result of the mapping step.
    [0002]
    2. Method according to claim 1, characterized in that the first type of substructure is a downlink substructure and the second type of substructure is an uplink substructure.
    [0003]
    3. Method according to claim 1, characterized in that the first type of substructure is a downlink substructure and the second type of substructure is a special substructure; and where only a feature grid of the first substructure type is mapped to reserve the first feature element in the first substructure type and that matches the second feature element in the second substructure type and mapped to at least one of the first sign of reference and the common control channel, not to transmit information.
    [0004]
    4. Method according to claim 2, characterized in that mapping (410) a resource grid of the first type of substructure to reserve a resource element in the first type of substructure and that corresponds to the second element element in the second type of substructure and mapping to at least one of a first reference signal and the common control channel, for not transmitting information, comprises: mapping a resource grid of the first substructure type to reserve at least one of the following resource elements in the first substructure type, to not transmit information: a resource element that corresponds to a resource element mapped to a Physical Downlink Control Channel in the second type of substructure; a resource element that corresponds to a resource element mapped to an Uplink Pilot Channel in the second type substructure; a resource element that corresponds to a resource element mapped to a Reference Signal Channel d and Sound in the second type of substructure; and a resource element that corresponds to a resource element mapped to an Uplink Demodulation Reference Signal in the second substructure type.
    [0005]
    5. Method according to claim 2, characterized in that mapping (410) a resource grid of the second type of substructure to reserve the third resource element in the second type of substructure and which corresponds to the fourth resource element in the first type and mapped to at least one of a first reference signal and the common control channel, for not transmitting information, comprises: mapping (410) a resource grid of the second substructure type to reserve at least one of the following resource elements in the second type of substructure, not to transmit information: a resource element that corresponds to a resource element mapped to a Physical Downlink Control Channel in the first type of substructure; a resource element that corresponds to a resource element mapped to a Radio Channel Physical broadcast in the first type of substructure; a feature element that corresponds to a feature element mapped to a broadcast radio channel dynamic usage in the first substructure type;a resource element that corresponds to a resource element mapped to a Channel State Reference Information Signal in the first substructure type;a resource element that corresponds to a resource element mapped to a Reference Signal Cell-Specific in the first substructure type; a resource element that corresponds to a resource element mapped to a Downlink Demodulation Reference Signal in the first substructure type.
    [0006]
    6. Apparatus (500) for reducing interference in a wireless communication system, the wireless communication system comprising a first cell (110-a) and a second cell (120-a), wherein the link substructure configuration uplink/downlink of the first cell (110-a) and second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) while implementing a second type of substructure different from the one first type of substructure in the second cell (120-a), thereby producing intercellular interference, the apparatus characterized in that it comprises: a mapper (510) configured to map (410) a resource grid of at least one of the first type of substructure and the second substructure type to reserve at least one of a first resource element in the first substructure type that corresponds to a second resource element in the second substructure type and mapped to at least one of a first reference signal and a common control channel, and a third resource element in the second substructure type that corresponds to a fourth resource element in the first substructure type and mapped to at least one of a second reference signal and the control channel common, not to transmit information; and a transmitter (520) configured to transmit (4200 a mapping result from the mapper.
    [0007]
    7. A method for reducing interference in a wireless communication system, the wireless communication system comprising a first cell (110-a) and a second cell (120-a), wherein the uplink/substructure configuration downlink of the first cell (110-a) and the second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) while implementing a second type of substructure different from the first type substructure in the second cell (120-a), thereby producing intercellular interference, the method characterized by the fact that it comprises: receiving (610) information related to mapping from a feature grid of the first type of substructure or information related to mapping of a feature grid of the second substructure type, where the feature grid of the first substructure type is mapped as reserving a first feature element in the first substructure type and what color responds to a second resource element in the second type of substructure and mapped to at least one of a first reference signal and a common control channel, not to transmit information; and the resource grid of the second substructure type is mapped as reserving a third resource element in the second substructure type and which corresponds to a fourth resource element in the first substructure type and mapped to at least one of a second reference signal and a channel of common control, not to transmit information.
    [0008]
    8. Base station (110, 120, 700) for reducing interference in a wireless communication system (100), the wireless communication system (100) comprising a first cell (110-a) and a second cell (120). -a), wherein the uplink/downlink substructure configuration of the first cell (110-a) and second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110) -a) while implementing a second type of substructure different from the first type of substructure in the second cell (120-a), thereby producing intercellular interference, the base station (110, 120, 700) characterized in that it comprises: a receiver (710) configured to receive (610) information relating to mapping of a feature grid of the first type of substructure or information relating to mapping of a grid feature of the second type of substructure, wherein the feature grid of the first type of substructure is mapped as reserving a first resource element in the first substructure type that corresponds to a second resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, not to transmit information; and the resource grid of the second substructure type is mapped as reserving a third resource element in the second substructure type that corresponds to a fourth resource element in the first substructure type and mapped to at least one of a second reference signal and a channel of common control, not to transmit information.
    [0009]
    9. A method of reducing interference in a wireless communication system, the wireless communication system comprising a first cell (110-a) and a second cell (120-a), wherein the uplink/substructure configuration downlink of the first cell (110-a) and the second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) while implementing a second type of substructure different from the first type of substructure in the second cell (120-a), thereby producing intercellular interference, the method characterized in that it comprises: receiving information related to mapping a feature grid of the second type of substructure; map a resource grid of the first substructure type to reserve a resource element in the first substructure type and that corresponds to a resource element in the second substructure type and mapped to at least one of a reference signal and a common control channel, to not transmit information.
    [0010]
    10. Method according to claim 9, characterized in that the first type of substructure is a downlink substructure and the second type of substructure is an uplink substructure; and where mapping the resource grid of the first substructure type to reserve the first resource element in the first substructure type and which corresponds to the second resource element in the second substructure type and mapped to at least one of the first reference signal and the channel common control, to not transmit information, comprises: mapping the resource grid of the first substructure type to reserve at least one of the following resource elements in the first substructure type, not to transmit information: a resource element that corresponds to a mapped resource element for a Physical Downlink Control Channel in the second type of substructure; a resource element that corresponds to a resource element mapped to an Uplink Pilot Channel in the second type of substructure; a resource element that corresponds to a resource element mapped to a Sound Reference Signal channel in the second type of substructure; and a resource element that corresponds to a resource element mapped to an Uplink Demodulation Reference Signal in the second substructure type.
    [0011]
    11. Method according to claim 9, characterized in that the first type of substructure is an uplink substructure and the second type of substructure is a downlink substructure; and where mapping the resource grid of the first substructure type to reserve the first resource element in the first substructure type that corresponds to the second resource element in the second substructure type and mapped to at least one of the first reference signal and the channel of Common control, to not transmit information, comprises: mapping the resource grid of the first substructure type to reserve at least one of the following resource elements in the first substructure type, not to transmit information: a resource element that corresponds to a resource element mapped to a Physical Downlink Control Channel in the second substructure type; a resource element that corresponds to a resource element mapped to a Physical Broadcast Channel in the second substructure type; a resource element that corresponds to a resource element mapped to a channel dynamic broadcasting in the second type of substructure; a resource element that corresponds to a resource element mapped to a Channel State Reference Information Signal in the second substructure type; a resource element that corresponds to a resource element mapped to a Cell-Specific Reference Signal in the second substructure type; a resource element that corresponds to a resource element mapped to a Downlink Demodulation Reference Signal in the second substructure type.
    [0012]
    12. Method, according to claim 9, characterized in that it also comprises: transmitting information related to mapping the resource grid of the first type of substructure.
    [0013]
    13. Base station (110, 120, 700) for reducing interference in a wireless communication system (100), the wireless communication system (100) comprising a first cell (110-a) and a second cell (120- a), wherein the uplink/downlink substructure configuration of the first cell (110-a) and second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) a) while implementing a second type of substructure different from the first type of substructure in the second cell (120-a), thereby producing intercellular interference, the base station (110, 120, 700) characterized in that it comprises: a receiver ( 710) configured to receive (610) information related to mapping a resource grid of the second type of substructure; a mapper (720) configured to map (620) a resource grid of the first type of substructure to reserve a resource element in the first type of substructure which corresponds to a resource element in the second type of substructure and mapped to at least one of a reference signal and a common control channel, not to transmit information.
    [0014]
    14. Base station (110, 120, 700), according to claim 13, characterized in that it further comprises: a transmitter (730) configured to transmit information related to mapping a resource grid of the first type of substructure.
    [0015]
    15. User equipment (130, 140) for reducing interference in a wireless communication system (100), the wireless communication system (100) comprising a first cell (110-a) and a second cell (120-a ), wherein the uplink/downlink substructure configuration of the first cell (110-a) and second cell (120-a) is asymmetric and may result in implementing a first type of substructure in the first cell (110-a) ) while implementing a second type of substructure different from the first type of substructure in the second cell (120-a), thereby producing intercellular interference, the user equipment characterized in that it comprises: a receiver configured to receive information related to mapping from a feature grid of the first substructure type or information related to mapping a feature grid of the second substructure type, where the feature grid of the first substructure type is mapped as a reserve a first the resource element in the first substructure type and corresponding to a second resource element in the second substructure type and mapped to at least one of a first reference signal and a common control channel, so as not to transmit information; and the resource grid of the second substructure type is mapped as reserving a third resource element in the second substructure type and which corresponds to a fourth resource element in the first substructure type and mapped to at least one of a second reference signal and a channel of common control, not to transmit information.
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    公开号 | 公开日
    KR20140005303A|2014-01-14|
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    BR112013024807A2|2016-12-20|
    CN102740463A|2012-10-17|
    JP2014522133A|2014-08-28|
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    WO2012131498A2|2012-10-04|
    KR101458734B1|2014-11-05|
    EP2692171A4|2014-11-05|
    WO2012131498A3|2012-11-22|
    US20140016597A1|2014-01-16|
    TWI526008B|2016-03-11|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-12-28| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-02-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201110081521.0|2011-03-31|
    CN2011100815210A|CN102740463A|2011-03-31|2011-03-31|Method, device, base station and user equipment for reducing interference in wireless communication system|
    PCT/IB2012/000878|WO2012131498A2|2011-03-31|2012-03-28|Method, apparatus, base station and user equipment for reducing interference in a wireless communication system|
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