WO2014180382A1 - Procédé d'envoi et de réception de signal ainsi que système d'envoi/réception de signal - Google Patents

Procédé d'envoi et de réception de signal ainsi que système d'envoi/réception de signal Download PDF

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Publication number
WO2014180382A1
WO2014180382A1 PCT/CN2014/078128 CN2014078128W WO2014180382A1 WO 2014180382 A1 WO2014180382 A1 WO 2014180382A1 CN 2014078128 W CN2014078128 W CN 2014078128W WO 2014180382 A1 WO2014180382 A1 WO 2014180382A1
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Prior art keywords
base station
information
suppression
downlink control
cell
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PCT/CN2014/078128
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English (en)
Chinese (zh)
Inventor
王瑜新
李儒岳
孙云锋
陈艺戬
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中兴通讯股份有限公司
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Publication of WO2014180382A1 publication Critical patent/WO2014180382A1/fr

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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
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to a mobile communication technology, and more particularly to a signaling transmission method, a reception method, and a signaling transmission/reception system. Background technique
  • Inter-cell interference is an inherent problem in cellular mobile communication systems.
  • the traditional solution is to use frequency reuse to avoid interference between adjacent cells by letting neighboring cells use different carrier frequencies.
  • the frequency reuse coefficient is 1, that is, the neighboring cells use the same carrier frequency, and the inter-cell interference problem is also more than the traditional frequency reuse.
  • the system is complicated.
  • Long Term Evolution (LTE) is a system based on OFDM technology. It mainly uses inter-cell interference randomization, interference avoidance and coordination techniques to solve the interference problem. It is transmitted on the transmitting side through network-side precoding and cooperative scheduling. Avoid interference avoidance.
  • the interference coordination based on the sender largely depends on the accuracy of the channel state information (CSI) of the feedback. Due to the limitation of feedback signaling overhead and the delay of feedback processing, the delay of the backhaul link also greatly affects the effect of inter-cell cooperation.
  • CSI channel state information
  • the LTE system based on the method of interference coordination at the transmitting end cannot completely solve the interference problem. How to effectively eliminate and suppress interference between cells and between users is an important direction for further effective improvement of spectrum efficiency.
  • the common reference signal (CRS, Common Reference Signal) is used for pilot measurement and data demodulation, that is, all users use CRS for channel estimation.
  • CRS Common Reference Signal
  • the transmitting end needs to additionally notify the receiving end of the specific precoding matrix (also referred to as precoding weight) information used for data transmission, and the overhead of the pilot is large.
  • MU-MIMO multi-user multi-input multi-output
  • LTE-A Enhanced Long Term Evolution
  • DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information Referenced Signal
  • MCS modulation coding mode
  • the pre-coding information is not carried in the transmission of the CSI-RS; and the DMRS is mainly used for the Physical Downlink Shared Channel (PDSCH) and the Enhanced Physical Downlink Control Channel (ePDCCH).
  • PDSCH Physical Downlink Shared Channel
  • ePDCCH Enhanced Physical Downlink Control Channel
  • the transmission of the DMRS carries precoding information of the corresponding PDSCH/ePDCCH.
  • LTE and LTE-A systems can be classified into Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems according to the uplink and downlink duplex modes.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • CSI-RS and FDD and TDD systems are used.
  • the pattern of the DMRS will vary.
  • advanced receivers can be mainly divided into several types: MMSE-IRC (Minute Mean Square Error-Interference Rejection Combining) Receiver, IC (Interference Cancellation, Interference cancellation) Receiver, ML (Maximum Likelihood) receiver.
  • MMSE-IRC Minute Mean Square Error-Interference Rejection Combining
  • IC Interference Cancellation, Interference cancellation
  • ML Maximum Likelihood
  • the network side needs to provide the target UE with the DMRS port information used by the interfering UE and the initialization parameters of the DMRS (including the scrambling code ID, the virtual cell ID, the physical cell ID, etc.);
  • the network side needs to provide the above information required by MMSE-IRC, and also needs to provide the modulation mode or MCS information of the interference source. It can be seen that if the information is transmitted through the X2 interface and the air interface between the cells, a large amount of X2 signaling overhead and air interface signaling overhead will be consumed, and a large delay will be caused, which will eventually make the advanced receiver technology difficult to apply.
  • the present invention provides a signaling sending method, a receiving method, and a signaling transmitting/receiving system, which can timely and effectively transmit interference cancellation or suppression information required by an advanced receiver to a target UE, and has small signaling overhead and small delay.
  • a signaling sending method including: the first base station sends downlink control signaling in a user-specific search space and/or in a public search space;
  • the downlink control signaling carries information required by the user terminal for interference cancellation or suppression.
  • the method further includes: the first base station transmitting downlink control signaling for scheduling a physical downlink shared channel in a user-specific search space;
  • the downlink control signaling used for scheduling the physical downlink shared channel is downlink control signaling for scheduling the PDSCH, and includes: DCI format 1, or DCI format 1A, or DCI format 1B, or DCI format 1C, or DCI format 1D. , or DCI format 2, or DCI format 2A, or DCI format 2B, or DCI format 2C, or DCI format 2D.
  • the information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate a modulation and coding mode MCS used by the target terminal, and/or precoding information, and/or a joint indication antenna Port, scrambling code ID, layer number information, and/or carrier indication information; or,
  • the information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate MCS used by all user terminals in the cell, and/or precoding information, and/or jointly indicate an antenna port, Scrambling code ID, layer number information, and/or carrier indication information; or
  • the information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate the MCS corresponding to each sub-band in the bandwidth of the current system, and/or the precoding information, and/or the joint indication antenna port. , scrambling code ID, information on the number of layers, and/or carrier indication information.
  • the downlink control signaling is a newly defined DCI format, which is DCI format IX or DCI format 2X or DCI format Y or DCI format 3Z, and the payload size is equal to the payload size of DCI format 1C; wherein X represents E or F or G or H, Y means 5 Or 6 or 7 or 8, Z means B or C or 0 or £.
  • the method further comprises: the first base station feeding back network auxiliary information to the second base station that requests the network to assist the interference cancellation or suppression.
  • the feeding, by the first base station, the network assistance information to the second base station includes:
  • the second base station sends request information to the first base station through the X2 interface, indicating that the user terminal in the cell in which the second base station is located uses an advanced receiver to perform interference cancellation or suppression;
  • the first base station After receiving the request information from the second base station, the first base station feeds back the network auxiliary information to the second base station that requests interference cancellation or suppression.
  • the request information includes:
  • Indicates whether network assisted interference cancellation or suppression is required indicates whether there is information in the cell for the user terminal to use the advanced receiver for interference cancellation or suppression; indicates which physical resource blocks PRB need network-assisted interference cancellation or suppression Information; information indicating on which subframes network-assisted interference cancellation or suppression is required; information indicating the carrier.
  • the network assistance information includes:
  • the method further comprises: the first base station scrambling the cyclic redundancy check CRC of the downlink control signaling by using the public RNTI.
  • the method further includes:
  • the user terminal of the cell in which the second base station is located uses the public RNTI in the network auxiliary information fed back by the first base station to blindly detect the downlink control signaling sent by the first base station in the public search space; or The information of the time domain resource and/or the frequency domain resource of the ePDCCH in the network auxiliary information fed back by the base station, and the downlink control signaling sent by the first base station is blindly detected on the user-specific search space;
  • MCS used by a neighboring cell or a strong interfering cell corresponding to a frequency band in which the user terminal is located, and/or precoding information, and / or jointly indicating the antenna port, the scrambling code ID, the number of layers of information, and / or carrier indication information;
  • the method further includes:
  • the second base station distinguishes the downlink control signaling from the DCI format 1C by using a high layer RRC signaling indication; or is distinguished by the public RNTI.
  • the method further includes: configuring, by the first base station, a subframe that needs to send downlink control signaling, where the downlink control signaling is sent in a configured subframe; where the configured subframe can reuse an ABS subframe Instructions.
  • the second base station notifies the user terminal through the DCI whether to use the advanced receiver for interference cancellation or suppression in the current subframe.
  • the present invention also provides a signaling receiving method, including:
  • the user terminal of the cell where the second base station is located to request the network to assist the interference cancellation or suppression, using the public RNTI or the information of the time domain resource and/or the frequency domain resource of the ePDCCH in the network auxiliary information fed back by the first base station,
  • the downlink control signaling sent by the first base station is blindly detected on the search space or the user-specific search space;
  • MCS used, and/or precoding information, and/or joint indication Antenna port, scrambling code ID, layer number information, and/or carrier indication information;
  • the method further includes: The second base station distinguishes the downlink control signaling from the DCI format 1C by using a high layer RRC signaling indication; or is distinguished by the public RNTI.
  • the present invention further provides a signaling transmitting/receiving system, comprising at least a first base station, and a second base station requesting network assistance for interference cancellation or suppression;
  • the first base station is configured to: transmit downlink control signaling carrying the information required by the user terminal for interference cancellation or suppression in a user-specific search space and/or in a public search space.
  • the first base station is further configured to: feed back network auxiliary information to the second base station that requests the network to assist interference cancellation or suppression.
  • the second base station is configured to: send, by using an X2 interface, request information to a neighboring cell or a base station of a strong interfering cell, that is, the first base station, where the user terminal in the cell where the second base station is located is to use an advanced receiver. Elimination or suppression of interference;
  • the first base station is further configured to: after receiving the request information from the second base station, feed back the network auxiliary information to the second base station that requests interference cancellation or suppression.
  • the second base station is configured to: when a user terminal of a cell where the second base station is located uses an advanced receiver,
  • the user terminal of the cell where the second base station is located using the public RNTI or the time domain resource of the ePDCCH and/or the information of the frequency domain resource in the network auxiliary information fed back by the first base station, in a public search space or a user-specific
  • the downlink control signaling sent by the first base station is blindly detected in the search space; when the downlink control signaling is detected, the user terminal used by the cell where the first base station is located corresponding to the frequency band in which the user equipment is located is required to perform interference cancellation or suppression.
  • Information MCS, and/or precoding information, and/or joint indication antenna port, scrambling code ID, layer number information, and/or carrier indication information, using advanced receiver for interference cancellation or suppression.
  • the technical solution of the present application provides that the first base station sends downlink control signaling in a user-specific search space and/or in a public search space, and the downlink control signaling carries information required for user terminal to perform interference cancellation or suppression.
  • the method of the embodiment of the present invention sends the downlink control signaling carrying the interference cancellation or suppression information through the public search space and/or in the user-specific search space, and on the one hand, effectively eliminates the interference required by the advanced receiver or The suppression information is transmitted to the target UE, and the signaling overhead is small and the delay is small; on the other hand, the interference is eliminated or the information is not passed through the X2 interface.
  • the problem of large signaling delay and large delay caused by the user terminal acquiring the network auxiliary information is solved.
  • the method of the embodiment of the present invention ensures the application of the advanced receiver technology in the downlink transmission of the LTE-A, thereby improving the spectrum efficiency of the network.
  • FIG. 1 is a flowchart of a signaling sending method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a signaling transmission/reception system according to an embodiment of the present invention. Preferred embodiment of the invention
  • FIG. 1 is a flowchart of a signaling sending method according to an embodiment of the present invention. As shown in FIG. 1 , the method includes: Step 101: The first base station sends downlink control signaling in a user-specific search space and/or in a public search space. The downlink control signaling carries information required by the user terminal for interference cancellation or suppression.
  • the step of the following includes: the first base station sends the downlink control signaling for scheduling the physical downlink shared channel in the user-specific search space, where the downlink control signaling used for scheduling the physical downlink shared channel includes: 1 (DCI format 1 ), or downlink control signaling format 1A (DCI format 1A ), or downlink control signaling format IB ( DCI format IB ), or downlink control signaling format 1C ( DCI format 1C ), or downlink control signal Let format ID (DCI format ID), or downlink control signaling format 2 (DCI format 2), or downlink control signaling format 2A (DCI format 2A), or downlink control signaling format 2B (DCI format 2B), or downlink Control signaling format 2C (DCI format 2C), or downlink control signaling format 2D ( DCI format 2D );
  • the downlink control signaling carrying the information required by the user terminal for interference cancellation or suppression is: The information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate the modulation and coding mode used by the target terminal (MCS), and/or precoding information, and/or joint indication antenna port, scrambling code ID, number of layers ( Antenna port(s), scrambling identity and The information of the number of layers, and/or the carrier indicator; or the information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate that all user terminals in the cell use MCS, and/or precoding information, and/or joint indication antenna port, scrambling code ID, layer number information, and/or carrier indication information; or
  • the information required by the user terminal carried in the downlink control signaling to perform interference cancellation or suppression is: used to indicate the MCS corresponding to each sub-band in the bandwidth of the system of the cell, and/or precoding information, and/or jointly indicate the antenna port and the interference.
  • Code ID information on the number of layers, and/or carrier indication information.
  • the downlink control signaling may also be a newly defined DCI format, which is DCI format IX or DCI format 2X or DCI format Y or DCI format 3Z, and the payload size is equal to the payload size of DCI format 1C; Represents E or F or G or H, Y represents 5 or 6 or 7 or 8, and Z represents B or C or 0 or £.
  • the method of the embodiment of the present invention sends downlink control signaling carrying information required for interference cancellation or suppression through a public search space, and on the one hand, timely and effectively transmits information required for interference cancellation or suppression required by the advanced receiver to
  • the target UE has a small signaling overhead and a small delay; on the other hand, since the information required for interference cancellation or suppression is not transmitted through the X2 interface, the signaling overhead caused by the user terminal acquiring the network auxiliary information is solved. The problem of large delays.
  • the method of the embodiment of the present invention ensures the application of the advanced receiver technology in the downlink transmission of the LTE-A, thereby improving the spectrum efficiency of the network.
  • the method further includes:
  • Step 100 The first base station feeds back the network auxiliary information to the second base station that requests the network to assist the interference cancellation or suppression.
  • This step specifically includes:
  • the second base station sends the request information to the neighboring cell or the base station of the strong interfering cell, that is, the first base station, by using the X2 interface, where the user terminal in the cell where the second base station is located needs to use the advanced receiver to perform interference cancellation or suppression;
  • the request information includes: information indicating whether network assistance is required for interference cancellation or suppression; indicating whether there is information in the cell that the user terminal is to use an advanced receiver for interference cancellation or suppression; indicating which physical resource blocks (PRBs) need to be networked Information for assisted interference cancellation or suppression; information indicating on which subframes network-assisted interference cancellation or suppression is required; information indicating the carrier, and the like. Then, after receiving the request information from the second base station, the first base station feeds back the network auxiliary information to the second base station that assists the network to perform interference cancellation or suppression. among them,
  • PRBs physical resource blocks
  • the network auxiliary information includes: indicating a system bandwidth used by a cell where the first base station is located; or/or information indicating a downlink transmission mode corresponding to each sub-band or physical resource block of the cell of the first base station; and/or indicating that the first base station is located Information of the uplink and downlink subframe configuration of the cell; and/or information indicating a time domain resource and/or a frequency domain resource of the ePDCCH of the cell where the first base station is located; and/or a public RNTI; and/or a cell of the first base station a cell ID; and/or information indicating a carrier, and the like.
  • the public RNTI is a NAICS-RNTI. It should be noted that the public RNTI may have different specific names. As long as the name indicates a public RNTI, it belongs to the protection scope of the present invention.
  • the method of the embodiment of the present invention further includes: the first base station scrambles the CRC of the downlink control signaling by using the public RNTI.
  • the user terminal of the cell where the second base station is located if the advanced receiver is to be used, the method for receiving the signaling by the present invention includes:
  • the user terminal of the cell in which the second base station is located in the network-assisted interference cancellation or suppression uses the public RNTI in the network auxiliary information fed back by the first base station to blindly detect the downlink control signaling sent by the first base station in the public search space.
  • detecting the downlink control signaling acquiring the MCS, and/or precoding information used by the cell where the first base station is located corresponding to the frequency band in which the user terminal is located, and/or jointly indicating the antenna port, the scrambling code ID, and the number of layers
  • the user terminal such as carrier indication information performs information required for interference cancellation or suppression; finally, using the obtained interference to eliminate or suppress the required information, using an advanced receiver for interference cancellation or suppression.
  • the method of the present invention further includes: the second base station distinguishes the downlink control signaling and the DCI format 1C by using the high layer RRC signaling indication. Or by RNTI;
  • the first base station may configure a subframe that needs to send downlink control signaling, and the first base station sends downlink control signaling only in the configured subframe.
  • the configured subframe may reuse the ABS subframe indication.
  • the second base station notifies the user terminal through the DCI whether to use the advanced in the current subframe.
  • the receiver performs interference cancellation or suppression.
  • the second base station is configured to include at least a first base station, and the network is requested to perform interference cancellation or suppression.
  • the user-specific search space and/or the downlink control signaling carrying the information required by the user terminal for interference cancellation or suppression is transmitted in the public search space.
  • the first base station is further configured to feed back the network auxiliary information to the second base station that requests the network to assist the interference cancellation or suppression.
  • a second base station configured to send, by using an X2 interface, request information to a neighboring cell or a base station of the strong interfering cell, that is, the first base station, where the user terminal in the cell where the second base station is located uses an advanced receiver to perform interference cancellation or suppression;
  • the first base station is further configured to: after receiving the request information from the second base station, feed back the network auxiliary information to the second base station that requests interference cancellation or suppression.
  • the user terminal of the cell where the second base station is located is used to blindly detect the downlink control signaling sent by the first base station in the public search space by using the public RNTI in the network auxiliary information fed back by the first base station, or use the feedback of the first base station.
  • the network side base station (referred to as the second base station) sends request information to the neighboring cell or the base station of the strong interfering cell (referred to as the first base station), and requests the first base station to assist the user terminal in the cell where the second base station is located. Perform interference cancellation or suppression.
  • the first base station After receiving the request from the first base station, the first base station first feeds back information such as the system bandwidth used by the first base station and/or the public RNTI (recorded as NAICS-RNTI) to the second base station; When the base station schedules the PDSCH, it sends downlink control in addition to the user-specific search space. Signaling, and sending downlink control signaling in the public search space. among them,
  • the downlink control signaling is downlink control signaling for scheduling the PDSCH, and includes: DCI format 1, DCI format 1A, DCI format 1D, DCI format 2, DCI format 2A, DCI format 2B, DCI format 2C, and DCI format 2D.
  • Downlink control signaling can be one of the following ways:
  • the information required for interference cancellation or suppression carried by the downlink control signaling is: indicating a modulation and coding scheme (MCS) used by the target terminal, and/or precoding information, and/or jointly indicating the antenna port and the interference.
  • Code ID information on the number of layers, and/or carrier indication information.
  • the information indicating the antenna port, the scrambling code ID, and the number of layers is 3 bits;
  • the precoding information is 3 bits (the number of CRS ports is 2) or 6 bits (the number of CRS ports is 4);
  • the modulation coding mode of the transport block 1 is 5 bits; when two PDSCH codewords are scheduled, the modulation coding mode of the transport block 1 is 5 bits, and the modulation and coding mode of the transport block 2 is 5 bits. ; Carrier indication.
  • Manner 2 The information required for interference cancellation or suppression carried by the downlink control signaling is: used to indicate MCS used by all user terminals in the cell, and/or precoding information, and/or joint indication antenna port, scrambling code ID, information on the number of layers, and/or carrier indication information. For example, if the current subframe is tuned to two, that is, user 1 and user 2, the information carried by the downlink control signaling includes:
  • the method includes: a carrier indication, indicating that the antenna port, the scrambling code ID, and the number of layers are 3 bits, and the precoding information is 3 bits (the number of CRS ports is 2) or 6 bits (the number of CRS ports is 4);
  • the modulation and coding scheme of the transport block 1 is 5 bits;
  • the modulation and coding scheme of the transport block 1 is 5 bits, and the modulation and coding scheme of the transport block 2 is 5 bits.
  • modulation and coding scheme of the transport block 1 is 5 bits; when two PDSCH codewords are scheduled, the modulation and coding scheme of the transport block 1 is 5 bits, and the modulation and coding scheme of the transport block 2 is 5 bits.
  • the information required for interference cancellation or suppression carried by the downlink control signaling is: The MCS corresponding to each sub-band within the bandwidth of the cell system, and/or precoding information, and/or joint indication antenna port, scrambling code ID, layer number information, and/or carrier indication information. For example, if the system bandwidth of the cell is divided into N subbands, the information carried by the downlink control signaling includes:
  • MCS and/or precoding information corresponding to subband 1, and/or joint indication antenna port, scrambling code ID, layer number information, and/or carrier indication information; MCS corresponding to subband 2, and/or precoding Information, and/or joint indication antenna port, scrambling code ID, layer number information, and/or carrier indication information, ...; MCS corresponding to subband N, and/or precoding information, and/or joint indication antenna Port, scrambling code ID, information on the number of layers, and/or carrier indication information.
  • the user terminal of the cell where the second base station is located may use the public RNTI to blindly detect the downlink control signaling sent by the neighboring cell in the public search space, or use the network auxiliary information fed back by the first base station.
  • the information of the time domain resource and/or the frequency domain resource of the ePDCCH is used to blindly detect the downlink control signaling sent by the first base station in the user-specific search space. After detecting the downlink control signaling, the acquiring and the user terminal are located.
  • the machine performs interference cancellation or suppression.
  • the second base station sends request information to the neighboring cell or the first base station of the strong interfering cell through the X2 interface, and requests the first base station to assist the user in the cell where the second base station is located to perform interference cancellation or suppression.
  • the request information includes:
  • NAICS indicates M bit string (each position in the BIT bitmap represents 1
  • PRB (The first bit indicates PRB 0, (1..1 10, ... ) The second bit indicates PRB 1, ..., and so on). A value of 1 indicates that NAICS needs to be done, and a value of 0 indicates that NAICSo does not need to have a maximum of 1 10 physical resource blocks.
  • the first base station uses the system bandwidth used by the first base station itself, and/or the downlink transmission mode corresponding to each sub-band or physical resource block of the cell where the first base station is located, and/or the public RNTI (denoted as Information such as NAICS-RNTI) is fed back to the second base station.
  • the public RNTI denoted as Information such as NAICS-RNTI
  • the second base station sends the request information to the neighboring cell or the first base station of the strong interfering cell, and requests the first base station to assist the user in the cell where the second base station is located to perform interference cancellation or suppression. After the first base station receives the request,
  • the downlink control signaling includes:
  • the downlink control signaling is a newly defined DCI format, which is DCI format IX or DCI format 2X or DCI format Y or DCI format 3Z, and its payload size (ayload size) is equal to the payload size of DCI format 1C; where X represents E Or F or G or H, Y means 5 or 6 or 7 or 8, and Z means B or C or 0 or £.
  • the second base station distinguishes the downlink control signaling and the DCI format 1C by using the high layer RRC signaling indication. Or differentiated by RNTI.
  • the second base station of the interfered cell sends the request information to the neighboring cell or the first base station of the strong interfering cell, and requests the first base station to assist the user in the cell where the second base station is located to perform interference cancellation or suppression. After the first base station receives the request,
  • the system bandwidth used by the first base station and/or the information of the public RNTI, the time domain resource of the ePDCCH, and/or the information of the frequency domain resource are fed back to the second base station; and then, when the first base station schedules the PDSCH, Two sets (set) are configured for the ePDCCH, and one set (denoted as set 1) stores downlink control signaling of the scheduled downlink user, and uses a user-specific RNTI to add a cyclic redundancy check (CRC) of the downlink control signaling.
  • the other set (denoted as set 2) stores the downlink control signaling, and the CRC of the downlink control signaling is scrambled using the public NAICS-RNTI.
  • the downlink control signaling is:
  • the interference cancellation or suppression information carried by the downlink control signaling is: used to indicate the MCS used by the target terminal, and/or precoding information, and/or jointly indicate the antenna port, the scrambling code ID, the number of layers, and/or Carrier indication information; or,
  • the interference cancellation or suppression information carried by the downlink control signaling is: used to indicate MCS used by all user terminals in the cell, and/or precoding information, and/or information indicating the antenna port, the scrambling code ID, and the number of layers. , and / or carrier indication information; or,
  • the interference cancellation or suppression information carried by the downlink control signaling is: used to indicate the MCS corresponding to each subband in the bandwidth of the system of the local cell, and/or precoding information, and/or jointly indicate the antenna port, the scrambling code ID, and the number of layers. Information, and/or carrier indication information.
  • the second base station of the interfered cell notifies the user terminal of the local cell of the time domain and frequency domain resource location of the ePDCCH set 2 and the NAICS-RNTI by using RRC signaling; wherein the user terminal is in the set 2 Positionally detecting the ePDCCH of the strong interfering cell, obtaining the MCS used by the neighboring cell or the strong interfering cell corresponding to the frequency band in which the user terminal is located, and/or precoding information, and/or jointly indicating the antenna port, the scrambling code ID, The number of layers of information, and/or carrier indication information, is then used by the advanced receiver for interference cancellation or suppression.
  • the second base station of the interfered cell sends the request information to the neighboring cell or the first base station of the strong interfering cell, and requests the first base station to assist the user in the cell where the second base station is located to perform interference cancellation or suppression.
  • the request information includes: information indicating on which subframes the network assisted dry elimination or suppression (NAICS) is required.
  • the first base station After receiving the request, the first base station first feeds back information about the system bandwidth used by the first base station and/or the public NAICS-RNTI, the time domain resource of the ePDCCH, and/or the information of the frequency domain resource to the second base station; Then, when the first base station schedules the PDSCH for the subframe in which the NAICS needs to be performed, two sets (sets) are configured for the ePDCCH, and one set (denoted as the set 1) stores downlink control signaling for scheduling the downlink user, and uses the user-specific Some RNTIs scramble the CRC of the downlink control signaling, and another set (denoted as set 2) stores the downlink control signaling, and uses the public RNTI to scramble the CRC of the downlink control signaling.
  • the downlink control signaling is transmitted in the public search space.
  • the downlink control signaling carries MCS, and/or precoding information corresponding to each subband in the bandwidth of the system of the local cell, and/or information indicating the antenna port, the scrambling code ID, the number of layers, and/or the carrier indication. information.
  • the second base station of the interfered cell notifies the user terminal of the local cell of the time domain and frequency domain resource location of the ePDCCH set 2 and the NAICS-RNTI by using RRC signaling; the user terminal in the second base station needs to perform the NAICS sub
  • the downlink control signaling in the set 2 of the strong interfering cell ePDCCH is blindly detected on the frame, or the downlink control signaling is blindly detected in the public PDCCH search space to acquire a neighboring cell or a strong interfering cell corresponding to the frequency band in which the user terminal is located.
  • the MCS used, and/or precoding information, and/or jointly indicate antenna port, scrambling code ID, layer number information, and/or carrier indication information, and then use advanced receiver for interference cancellation or suppression.
  • the second base station of the interfered cell notifies the user terminal whether to perform NAICS in the current subframe through the DCI, for example, by using 1 bit indication information in the DCI, and a value of 1 indicates that the user terminal needs to perform NAICS in the current subframe, and the value is 0.
  • Time indicates that the user terminal does not need to perform NAICS in the current subframe.
  • the method of the embodiment of the present invention transmits downlink control signaling carrying interference cancellation or suppression information through a public search space and/or in a user-specific search space, and on the one hand, timely and effectively requires an advanced receiver.
  • the interference cancellation or suppression information is transmitted to the target UE, and the signaling overhead is small and the delay is small.
  • the interference cancellation or suppression information is not transmitted through the X2 interface, the problem that the user terminal acquires the network auxiliary information is solved.
  • the problem of large signaling overhead and large delay the invention method of the embodiment ensures the application of the advanced receiver technology in the downlink transmission of the LTE-A, thereby improving the spectrum efficiency of the network.

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

Abstract

La présente invention concerne un procédé d'envoi et de réception de signal ainsi qu'un système d'envoi/réception de signal, faisant appel à l'envoi, par une première station de base, d'un signal de commande de liaison descendante dans un espace de recherche spécifique à un utilisateur et/ou dans un espace de recherche public, ledit signal de commande de liaison descendante véhiculant les informations demandées par un terminal d'utilisateur afin de déclencher une élimination ou une suppression d'interférences. Le procédé selon un mode de réalisation de la présente invention, au moyen de l'envoi d'un signal de commande de liaison descendante, véhiculant les informations demandées par un terminal d'utilisateur pour déclencher une élimination ou une suppression d'interférences, dans un espace de recherche public et/ou dans un espace de recherche spécifique à l'utilisateur, permet, d'une part, d'obtenir le transfert à temps et efficace des informations demandées par un récepteur de haut niveau pour déclencher une élimination ou une suppression d'interférences par rapport à un UE cible, tout en ayant une petite surcharge de signalisation et un léger temps de retard; d'autre part, du fait que les informations d'élimination ou de suppression d'interférences ne sont pas transférées au moyen d'une interface X2, de résoudre également les problèmes de surcharge importante de signalisation et de grand temps de retard consécutifs à l'obtention, par un terminal d'utilisateur, d'informations auxiliaires de réseau. Dans le même temps, le procédé selon un mode de réalisation de la présente invention garantit l'utilisation d'une technologie de récepteur de haut niveau lors d'une transmission de liaison descendante LTE-A, améliorant ainsi l'efficacité de spectre de fréquence de réseau.
PCT/CN2014/078128 2013-09-27 2014-05-22 Procédé d'envoi et de réception de signal ainsi que système d'envoi/réception de signal WO2014180382A1 (fr)

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