WO2014180382A1

WO2014180382A1 - Signal sending method and receiving method, and signal sending/receiving system

Info

Publication number: WO2014180382A1
Application number: PCT/CN2014/078128
Authority: WO
Inventors: 王瑜新; 李儒岳; 孙云锋; 陈艺戬
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-09-27
Filing date: 2014-05-22
Publication date: 2014-11-13
Also published as: CN104518806B; CN104518806A

Abstract

A signal sending method and receiving method, and a signal sending/receiving system, comprising a first base station sending a downlink control signal in a user-specific search space and/or in a public search space, said downlink control signal carrying information required by a user terminal for engaging in interference elimination or suppression. The present invention embodiment method, by means of sending a downlink control signal, carrying information required by a user terminal for engaging in interference elimination or suppression, in a public search space and/or in a user-specific search space, on the one hand achieves the timely and efficient transfer of information required by a high-level receiver for engaging in interference elimination or suppression to a target UE, while having small signaling overhead and small time delay; on the other hand, because the interference elimination or suppression information is not transferred by means of an X2 interface, the problems of large signaling overhead and large time delay resulting from a user terminal obtaining network auxiliary information are also solved. At the same time, the present invention embodiment method ensures the use of high-level receiver technology in LTE-A downlink transmission, thus enhancing network frequency spectrum efficiency.

Description

Signaling transmitting method, receiving method and signaling transmitting/receiving system

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. In the Orthogonal Frequency Division Multiplexing (OFDM) system, 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. However, 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. Currently, 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.

In the LTE system, 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. In the CRS-based precoding processing mode, 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. In addition, in a multi-user multi-input multi-output (MU-MIMO) system, since multiple terminals use the same CRS, pilot orthogonality cannot be achieved, and therefore, Estimated interference.

In the Enhanced Long Term Evolution (LTE-A) system, pilot measurement and data demodulation are separated in order to reduce pilot overhead and improve channel estimation accuracy. Two types of reference signals, DMRS (Demodulation Reference Signal) and Channel State Information Reference Signal (CSI-RS, Channel State Information Referenced Signal), are defined. The CSI-RS is mainly used for channel measurement to obtain channel quality information (CQI, Channel Quality Information) and feedback, so that the base station side can use the information to complete user scheduling and implement modulation coding mode (MCS, Modulation and Coding Scheme). For the allocation of the CSI-RS, 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). Channel estimation to complete demodulation of the data/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. CSI-RS and FDD and TDD systems are used. The pattern of the DMRS will vary.

In the advanced receiver research at the receiving end, 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.

For the MMSE-IRC receiver (assumed to be DMRS-based), 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.); For IC and ML receivers, 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. In the actual system. Especially under the network conditions of Non-ideal backhaul, the transmission delay between nodes is relatively large. Dynamic parameters such as DMRS port information, modulation mode or MCS are not suitable for transmission in the X2 interface in the case of non-ideal backhaul.

Therefore, in order to overcome the disadvantages of large signaling overhead and large delay, it is necessary to find a new way to timely and effectively transmit information such as initialization parameters and dynamic parameters required by the advanced receiver to the target UE. Summary of the invention

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. . In order to solve the above technical problem, the present invention discloses 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.

Preferably, 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.

Preferably, 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.

Preferably, 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 £.

Preferably, 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.

Preferably, 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;

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.

Preferably, 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.

Preferably, the network assistance information includes:

And indicating a system bandwidth used by the cell where the first base station is located; and/or information indicating a downlink transmission mode corresponding to each subband or physical resource block of the cell where the first base station is located; and/or indicating the first base station Information of the uplink and downlink subframe configuration of the cell in which the cell is located; 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 the a cell ID of a cell in which the base station is located; and/or information indicating the carrier.

Preferably, the method further comprises: the first base station scrambling the cyclic redundancy check CRC of the downlink control signaling by using the public RNTI.

Preferably, when the user terminal of the cell where the second base station is located uses an advanced receiver, 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; When detecting the downlink control signaling, acquiring information required by the user terminal for interference cancellation or suppression: 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;

Use the advanced receiver for interference cancellation or suppression using the information obtained to eliminate or suppress the interference.

Preferably, when the user terminal of the cell in which the second base station is located is blindly detecting the downlink control signaling in the public search space, 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.

Preferably, 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.

Preferably, 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;

When downlink control signaling is detected, information required for interference cancellation or suppression by the user terminal of the cell where the first base station is located corresponding to the frequency band in which the user terminal is located is obtained: MCS used, and/or precoding information, and/or joint indication Antenna port, scrambling code ID, layer number information, and/or carrier indication information;

Preferably, when the user terminal of the cell where the second base station is located is blindly detecting the downlink control signaling in a public search space or a user-specific search space, 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.

Preferably, 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.

Preferably, 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.

Preferably, 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. At the same time, 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. BRIEF abstract

The drawings are intended to provide a further understanding of the invention, and are intended to be illustrative of the invention. In the drawing:

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. At the same time, 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.

Before the method of the embodiment of the present invention, 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:

First, 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,

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:

First, 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. When 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 And 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.

When the user terminal blindly detects the downlink control signaling in the public search space, 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;

Further, 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.

Further, 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.

2 is a schematic structural diagram of a signaling transmitting/receiving system according to the present invention. As shown in FIG. 2, 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. specifically,

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;

When the user terminal of the 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 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 information of the time domain resource and/or the frequency domain resource of the ePDCCH in the network auxiliary information, and blindly detecting the downlink control signaling sent by the first base station in the user-specific search space; when detecting the downlink control signaling, acquiring and Information required for interference cancellation or suppression by the user terminal used by the cell in which the first base station is located corresponding to the frequency band in which the user terminal is located: MCS, 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, etc.; using the obtained interference cancellation or suppression information to perform interference cancellation or suppression using an advanced receiver.

The method of the present invention will be specifically described below in conjunction with the embodiments.

In the first embodiment, it is assumed that 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.

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:

Manner 1: 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. For example, 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);

When one PDSCH codeword is scheduled, 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:

For user 1, 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); When one PDSCH codeword is scheduled, the 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.

For user 2, including: carrier indication, indicating antenna port, scrambling code ID, layer number information is 3 bits, precoding information is 3 bits (CRS port number is 2) or 6 bits (CRS port number is 4); When one PDSCH codeword is scheduled, the 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.

Manner 3: 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.

In this way, 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 MCS used by the neighboring cell or the strong interfering cell corresponding to the frequency band, and/or precoding information, and/or jointly indicating the antenna port, the scrambling code ID, the number of layers of information, and/or the carrier indication information, and then using the advanced reception The machine performs interference cancellation or suppression.

In the second embodiment, it is assumed that 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. Wherein, the request information includes:

Information indicating whether network assistance is required for interference cancellation or suppression; and/or information indicating whether there is a user terminal in the cell to use an advanced receiver for interference cancellation or suppression; and/or indicating which PRBs need network-assisted interference Information that is eliminated or suppressed; and/or information indicating on which subframes network-assisted interference cancellation or suppression is required; and/or information indicating the carrier.

For example, use Table 1 to indicate: IE/Group Name Scope of IE format reference function description (Semantics

( IE type and description ) reference)

NAICS indicates M bit string (each position in the BIT bitmap represents 1

STRING ) 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.

Table 1

The specific implementation format of the information used to indicate which PRBs need network-assisted interference cancellation or suppression is actually transmitted in this format in the X2 interface. After receiving the request, 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.

In the third embodiment, it is assumed that 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,

First, the system bandwidth used by the second base station, 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 information feedback of the public RNTI (denoted as NAICS-RNTI) To the second base station; then, when the first base station schedules the PDSCH, in addition to transmitting the downlink control signaling in the user-specific search space, the downlink control signaling is sent in the public search space. 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 £.

When the user terminal of the second base station blindly detects the downlink control signaling in the public search space, 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. In the fourth embodiment, it is assumed that 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,

First, 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.

In this embodiment, 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. In the fifth embodiment, it is assumed that 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.

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. Alternatively, in addition to transmitting the downlink control signaling in the user-specific search space, 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 above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

INDUSTRIAL APPLICABILITY 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. On the other hand, since 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. At the same time, 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.

Claims

Claim

1. A signaling sending method, comprising:

The first base station transmits downlink control signaling in a user-specific search space and/or in a public search space;

The signaling method according to claim 1, wherein the method further comprises: the first base station transmitting, in a user-specific search space, a downlink control signal for scheduling a physical downlink shared channel;

3. The signaling method according to claim 1, wherein

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 MCS used by the target terminal, and/or precoding information, and/or jointly indicate the antenna port and the interference. Code ID, layer number information, and/or carrier indication information; or

The signaling sending method according to claim 1, wherein the downlink control signaling is a newly defined DCI format, which is a DCI format IX or a DCI format 2X or a DCI format Y or a DCI format 3Z, and a payload size thereof. Equal to the payload size of DCI format 1C; where X represents E or F or G or H, Y represents 5 or 6 or 7 or 8, Z represents B or C or D or

E.

The signaling sending method according to claim 1, wherein the method further comprises: The first base station feeds back the network assistance information to the second base station that requests the network to assist in interference cancellation or suppression.

The signaling sending method according to claim 5, wherein the feeding back the network auxiliary information by the first base station to the second base station comprises:

The signaling sending method according to claim 6, wherein the request information comprises: information indicating whether network assisting for interference cancellation or suppression is required; indicating whether there is a user terminal in the cell to use an advanced receiver for interference Information that is eliminated or suppressed; information indicating which physical resource blocks PRBs need network-assisted interference cancellation or suppression; information indicating on which subframes network-assisted interference cancellation or suppression is required; information indicating the carrier.

The signaling sending method according to claim 5 or 6, wherein the network auxiliary information comprises:

The signaling method according to claim 8, wherein 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 for transmitting a signaling according to claim 1 or 5, wherein, when the user terminal of the cell in which the second base station is to use the advanced receiver, 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 time domain resource of the ePDCCH in the network auxiliary information fed back by the base station And/or the information of the frequency domain resource, the downlink control signaling sent by the first base station is blindly detected on the user-specific search space;

When detecting the downlink control signaling, acquiring information required by the user terminal for interference cancellation or suppression: 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 signaling sending method according to claim 10, wherein, when the user terminal of the cell in which the second base station is located is blindly detecting the downlink control signaling in the public search space, the method further includes: the second base station passing The high layer RRC signaling indicates distinguishing between the downlink control signaling and the DCI format 1C; or is distinguished by the public RNTI.

The signaling method according to claim 1, 5 or 10, wherein the method further comprises: configuring, by the first base station, a subframe that needs to send downlink control signaling, where the downlink control signaling is configured The subframe is sent in the middle; wherein the configured subframe can be reused to indicate the ABS subframe.

The signaling sending method according to claim 12, wherein the second base station notifies, by using the DCI, whether the user terminal wants to use the advanced receiver to perform interference cancellation or suppression in the current subframe.

14. A signaling receiving method, comprising:

The interference cancellation or suppression is performed using an advanced receiver using the information obtained by the interference cancellation or suppression.

The signaling receiving method according to claim 14, wherein when the user terminal of the cell in which the second base station is located blindly detects the downlink control signaling in a public search space or a user-specific search space, the method Also includes:

16. A signaling transmitting/receiving system, comprising at least a first base station, a second base station requesting network assistance for interference cancellation or suppression;

17. The signaling transmitting/receiving system according to claim 16, wherein

The first base station is further configured to feed back network assistance information to a second base station requesting network assistance for interference cancellation or suppression.

18. The signaling transmitting/receiving system according to claim 17, wherein

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 uses an advanced receiver to perform interference cancellation or Inhibit

The signaling transmitting/receiving system according to any one of claims 16 to 18, wherein the second base station is configured to: when a user terminal of a cell in which 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 search The downlink control signaling sent by the first base station is blindly detected in 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 terminal 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.