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CN104902485A - Method for suppressing interference between same kinds of nodes in full duplex cooperative transmission - Google Patents

Method for suppressing interference between same kinds of nodes in full duplex cooperative transmission Download PDF

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Publication number
CN104902485A
CN104902485A CN201410076883.4A CN201410076883A CN104902485A CN 104902485 A CN104902485 A CN 104902485A CN 201410076883 A CN201410076883 A CN 201410076883A CN 104902485 A CN104902485 A CN 104902485A
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China
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node
interference
base station
central processor
interference suppression
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CN201410076883.4A
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Inventor
韩圣千
刘鑫
杨晨阳
孙鹏飞
喻斌
孙程君
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Beijing Samsung Telecommunications Technology Research Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
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Priority to CN201410076883.4A priority Critical patent/CN104902485A/en
Publication of CN104902485A publication Critical patent/CN104902485A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

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

Abstract

The invention discloses a method for suppressing interference between same kinds of nodes in full duplex cooperative transmission. The method comprises that a central processor in a full duplex cooperative transmission system receives current resource state information reported by any kind of nodes in the full duplex cooperative transmission system, wherein the any kind of nodes are base stations or user equipment; the central processor determines the transmission mode of each node in the any kind of nodes according to the received information; when any emitting node interferes with any receiving node, the central processor determines a suppression manner of the interference and notifies the any emitting node and the any receiving node; and the any emitting node and the any receiving node performs interference suppression according to the notification sent by the central processor. The method may effectively suppressing interference between same kinds of nodes in the full duplex cooperative transmission system.

Description

Method and equipment for suppressing interference among similar nodes in full-duplex cooperative transmission
Technical Field
The present invention relates to full duplex cooperative transmission technologies, and in particular, to a method and an apparatus for suppressing interference between nodes of the same type in full duplex cooperative transmission.
Background
To meet the ever-increasing traffic demands of people, the design of existing wireless communication systems is moving towards higher data rates. Compared with the traditional cellular system, the lte (long Term evolution) system has adopted a higher level network architecture and transmission technology, and the performance in the aspects of transmission rate, network coverage and the like is greatly improved. However, in the face of rapid development of intelligent terminals and mobile internet and blowout-type increase in demand for wireless communication data rate, more advanced communication technology needs to be developed. Like 3D-input Multi-output (Multi-input Multi-output), Massive MIMO, and scn (small Cell network), etc., full duplex communication is a more advanced communication technology, and has a great application prospect in future communication system design.
Full duplex communication means that uplink and downlink bidirectional transmission is realized at the same frequency, and compared with a time division duplex technology and a frequency division duplex technology in the existing communication system, the full duplex communication can effectively improve the spectrum efficiency of a wireless communication system. The application of full duplex communication also faces significant challenges. First, in addition to the inter-node interference in the conventional half-duplex communication, i.e., the interference of the downlink base station to the user and the interference of the uplink user to the base station, the full-duplex communication performance is limited by the new inter-node interference caused by the simultaneous co-frequency transmission of the uplink and downlink, including the interference of the base station to the base station and the interference of the user to the user. Secondly, the interference between the nodes also limits the effective utilization of network resources, which is particularly reflected in that when full-duplex user nodes are respectively accessed to different base stations in uplink and downlink, very serious interference of the base stations to the base stations can be brought, so that the flexible access of the uplink and downlink of the full-duplex user is limited, and the full utilization of the network resources is not facilitated. The above factors greatly limit the advantages of full duplex communication.
Disclosure of Invention
The application provides a method and equipment for suppressing interference among nodes of the same kind in full-duplex cooperative transmission, which can effectively suppress the interference among the nodes of the same kind.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the interference suppression method among the similar nodes in the full duplex cooperative transmission comprises the following steps:
a first node in a full-duplex cooperative transmission system reports current resource state information of the first node to a central processor in the system;
the first node receives the interference suppression mode determined by the central processor and carries out interference suppression processing;
the central processor determines that the first node is an uplink or downlink data sender at present according to the information reported by the first node and the second node, and determines the interference suppression mode when the first node generates interference on the second node; or, the central processor determines that the first node is currently an uplink or downlink data receiver according to the information reported by the first node and the second node, and determines the interference suppression mode when the second stage is applied to the first node; the first node and the second node are both base stations, or the first node and the second node are both user equipment.
Preferably, when the interference suppression mode received is the interference suppression of the transmitting node,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: acquiring the characteristics of an interference channel between the second node and the first node, determining a precoding matrix according to the characteristics of the interference channel, and precoding and transmitting the transmission data;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: transmitting a training sequence for the second node to estimate the characteristics of an interference channel; or, the first stage estimates the characteristics of the interference channel according to the training sequence sent by the second node, and sends the characteristics to the second node.
Preferably, if the first node is currently an uplink or downlink data sender, the obtaining the characteristics of the interference channel between the second node and the first node includes:
the first node estimates the characteristics of the interference channel according to a training sequence sent by the second node; or,
receiving the characteristics of the interference channel transmitted by the second node.
Preferably, when the interference suppression mode received is the interference suppression of the receiving node,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: transmitting a pre-coded training sequence for the second node to estimate the equivalent interference channel characteristics, wherein a pre-coding matrix of the training sequence is the same as a pre-coding matrix of uplink or downlink transmission data of any node;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: and receiving the pre-coded training sequence sent by the second node, estimating the characteristics of an equivalent interference channel, determining a receiving equalizer according to the characteristics of the equivalent interference channel, and performing equalization processing on the received data.
Preferably, when the interference suppression mode received is joint interference suppression,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: sending a training sequence, receiving the transmitting precoding issued by the central processing node, and sending the data after precoding the data; or receiving a training sequence sent by the second node, estimating the characteristics of an interference channel between the first node and the second node, reporting the characteristics to the central processing node, receiving a transmission precoding sent by the central processing node, and sending the transmission precoding after precoding the sending data;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: receiving a training sequence sent by the second node, estimating the characteristics of an interference channel between the first node and the second node, reporting the characteristics to the central processing node, receiving a receiving equalization mode sent by the central processing node, and performing equalization processing on received data; or, sending a training sequence, receiving a receiving equalization mode issued by the central processing node, and performing equalization processing on received data;
wherein, the transmitting pre-coding or the receiving equalization mode is determined by the central processor according to the received interference channel characteristics.
Preferably, the first node is a base station, and when the received interference suppression mode is data sharing-based interference suppression,
if the first node is currently a downlink data sender, the processing of interference suppression by the first node includes: the first node sends downlink data and a special training sequence thereof to the second node through a backbone network;
if the first node is used as an uplink data receiver, the processing of the first node for interference suppression includes: the first node receives downlink data and a special training sequence sent by the second node, estimates the characteristics of an interference channel from the second node to the first node, reconstructs an interference signal from the second node received by the first node at an air interface, and subtracts the interference signal from a total received signal of the air interface.
Preferably, when the first node is currently a downlink data sender, the downlink data sent by the first node through the backbone network is: the precoded downlink signal, or the original downlink data and the precoding information sent by the air interface.
Preferably, when the first node is a base station, the training sequence is a dedicated training sequence dedicated to estimating inter-base station interference.
Preferably, when the first node is a user equipment, the training sequence is an uplink training sequence;
before the first node estimates the characteristics of the interference channel, further receiving, by the base station to which the first node belongs, ID information of the second node and configuration information of an uplink training sequence, which are sent by the base station to which the second node belongs; and estimating the characteristics of the interference channel according to the uplink training sequence determined by the configuration information.
Preferably, when the first node is a user equipment, the training sequence is an uplink training sequence;
if the first node is currently an uplink or downlink data receiver, when the first node performs interference suppression processing, before estimating the equivalent interference channel characteristics, the first node further receives, through its own base station, ID information of the second node, configuration information of an uplink training sequence, and precoding information of the second node, which are sent by the own base station of the second node; and estimating the equivalent interference channel characteristics according to the uplink training sequence determined by the configuration information and the precoding information of the second node.
Preferably, when the first node is a user equipment, the interaction between the first node and the central processor is performed through a base station to which the first node belongs.
Preferably, the current resource status information includes: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
Preferably, when the first node is a base station, the current resource status information further includes capacity and delay of a backbone network.
The interference suppression method among the similar nodes in the full duplex cooperative transmission comprises the following steps:
a central processor in a full-duplex cooperative transmission system receives current resource state information reported by any type of nodes in the system; the any type of node is a base station or user equipment;
and when the central processor determines that any node A in the transmitting state generates interference on any node B in the receiving state according to the received information, determining an interference suppression mode and informing the node A and the node B.
Preferably, the central processor determines that the interference suppression mode is interference suppression of a transmitting node;
the interference suppression by the transmitting node comprises: the node A acquires the characteristics of an interference channel between the node A and the node B, and determines a transmission precoding used for inhibiting the characteristics of the interference channel, and the node A performs precoding on transmission data by using the transmission precoding and then transmits the data.
Preferably, the central processor determines that the interference suppression mode is interference suppression of the receiving node;
the interference suppression by the receiving node comprises: and the node B estimates the characteristics of the equivalent interference channel from the node A to the node B after transmitting and precoding according to the precoded training sequence sent by the node A, determines a receiving equalization mode according to the characteristics of the equivalent interference channel, and performs equalization processing on the received signal according to the receiving equalization mode.
Preferably, the central processor determines that the interference suppression mode is joint interference suppression;
after the central processor notifies the node A and the node B to perform joint interference suppression, the central processor further receives the interference channel characteristics between the node A and the node B fed back by the node A or the node B, determines the transmission precoding mode of the node A and the receiving equalization mode of the node B, and notifies the node A and the node B respectively;
the joint interference suppression comprises: and the node A performs precoding on the transmitted data according to the transmitting precoding notified by the central processor and then transmits the data, and the node B performs equalization processing on the received data according to the receiving equalization mode notified by the central processor.
Preferably, any one of the nodes is a base station, and the central processor determines that the interference suppression mode is data sharing-based interference suppression;
the data sharing based interference mitigation comprises: the node A sends the precoded downlink signal sent by the node A or the sent downlink data and precoding information to the node B through a backbone network, the node B estimates the characteristics of an interference channel from the node A to the node B, reconstructs the interference signal from the node A received by the node B at an air interface, and directly subtracts the interference signal from the total received signal of the air interface.
Preferably, the current resource status information includes: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
Preferably, when any type of node is a base station, the current resource status information further includes capacity and delay of a backbone network.
Preferably, when any type of node is a user equipment, the information transmission between the central processor and the node a or the node B is performed through a base station to which the node a or the node B belongs.
The interference suppression method among the similar nodes in the full duplex cooperative transmission comprises the following steps:
a central processor in a full-duplex cooperative transmission system receives current resource state information reported by any type of nodes in the system; the any type of node is a base station or user equipment;
when the central processor determines that any node A in a transmitting state currently generates interference on any node B in a receiving state currently in any type of nodes according to the received information, determining a suppression mode of the interference, and informing the node A and the node B;
and the node A and the node B carry out interference suppression according to the notification sent by the central processor.
Preferably, the central processor determines that the interference suppression mode is interference suppression of a transmitting node;
the performing the interference suppression by the node a and the node B includes: the node A acquires the characteristics of an interference channel between the node A and the node B, determines a transmitting precoding used for inhibiting the characteristics of the interference channel, and transmits the data after precoding the data by using the transmitting precoding.
Preferably, the acquiring, by the node a, characteristics of an interference channel between the node a and the node B includes: the node A estimates the characteristics of an interference channel between the node B and the node A according to a training sequence sent by the node B; or, the node B estimates the characteristics of the interference channel between the node B and the node a according to the training sequence sent by the node a, and sends the characteristics to the node a.
Preferably, when any of the nodes is a base station, the training sequences sent by the node a and the node B are dedicated training sequences; and/or the presence of a gas in the gas,
when any type of node is user equipment, the training sequences sent by the node A and the node B are respective uplink training sequences; the node a receives, through its base station, the ID information and the uplink training sequence configuration information of the node B sent by its base station, and the node B receives, through its base station, the ID information and the uplink training sequence configuration information of the node a sent by its base station.
Preferably, the central processor determines that the interference suppression mode is interference suppression of the receiving node;
the performing the interference suppression by the node a and the node B includes: and the node B estimates the characteristics of the equivalent interference channel from the node A to the node B after transmission precoding, determines a receiving equalization mode according to the characteristics of the equivalent interference channel and performs equalization processing on a received signal.
Preferably, when any of the nodes is a base station, the node B estimating the equivalent interference channel characteristics includes: the node B receives the special training sequence sent by the node A and estimates the equivalent interference channel characteristic; and/or the presence of a gas in the gas,
when any of the nodes is a user equipment, the node B estimating the equivalent interference channel characteristics comprises: the node B receives the uplink training sequence of the node A and estimates the equivalent interference channel characteristic according to the precoding information of the node A; and the node B receives the ID information of the node A, the configuration information of the uplink training sequence and the precoding information which are sent by the base station to which the node A belongs through the base station to which the node B belongs.
Preferably, the central processor determines that the interference suppression mode is joint interference suppression, further receives the characteristics of an interference channel between the node B and the node a fed back by the node B or the node a, determines the transmission precoding mode of the node a and the reception equalization mode of the node a, and respectively notifies the node a and the node B;
the interference suppression by the node A and the node B comprises: and the node A performs precoding on the transmitted data according to the transmitting precoding notified by the central processor and then transmits the data, and the node B performs equalization processing on the received data according to the receiving equalization mode notified by the central processor.
Preferably, when any of the nodes is a base station,
the node B feeding back the characteristics of the interference channel between the two comprises: the node B estimates the characteristics of an interference channel from the node A to the node B according to the special training sequence sent by the node A and sends the characteristics to the central processor;
the node A feeding back the characteristics of the interference channel between the two nodes comprises: and the node A estimates the characteristics of an interference channel from the node B to the node A according to the special training sequence sent by the node B and sends the characteristics to the central processor.
Preferably, when any of the nodes is a user equipment,
the node B feeding back the characteristics of the interference channel between the two comprises: the node B receives the uplink training sequence of the node A, estimates the characteristics of an interference channel from the node A to the node B, and sends the characteristics to the central processor through a base station to which the node B belongs; the node B receives ID information of the node A and configuration information of an uplink training sequence sent by a base station to which the node A belongs through the base station to which the node B belongs;
the node A feeding back the characteristics of the interference channel between the two nodes comprises: the node A estimates the characteristics of an interference channel from the node B to the node A according to an uplink training sequence sent by the node B and sends the characteristics to the central processor; and the node A receives the ID information of the node B and the configuration information of the uplink training sequence sent by the base station to which the node B belongs through the base station to which the node A belongs.
Preferably, any one of the nodes is a base station, and the central processor determines that the interference suppression mode is data sharing-based interference suppression;
the interference suppression by the node A and the node B comprises: the node A sends the precoded downlink signal sent by the node A or the sent downlink data and precoding information to the node B through a backbone network, the node B estimates the characteristics of an interference channel from the node A to the node B, reconstructs the interference signal from the node A received by the node B at an air interface, and directly subtracts the interference signal from the total received signal of the air interface.
Preferably, the current resource status information includes: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
Preferably, when any type of node is a base station, the current resource status information further includes capacity and delay of a backbone network.
Preferably, when any of the nodes is a ue, the information transmission between the central processor and the node a or the node B is performed through a base station to which the node a or the node B belongs.
Node equipment in full-duplex cooperative transmission, comprising: the device comprises an information reporting unit, an interference suppression mode determining unit and an interference suppression processing unit;
the information reporting unit is used for reporting the current resource state information of the information reporting unit to a central processor in the system;
the interference suppression mode determining unit is used for receiving the interference suppression mode determined by the central processor;
the interference suppression processing unit is used for carrying out interference suppression processing according to the interference suppression mode;
the central processor determines the interference suppression mode when the first node equipment is determined to be an uplink or downlink data sender currently and the first node equipment generates interference on the second node equipment according to the information reported by the first node equipment and the second node equipment; or, the central processor determines that the first node device is currently an uplink or downlink data receiver according to the information reported by the first node device and the second node device, and determines the interference suppression mode when the second node device interferes with the first node device; the first node device and the second stage device are both base stations, or the first stage device and the second stage device are both user equipment.
A central processor in a full-duplex cooperative transmission system, comprising: a node information receiving unit and an interference suppression mode determining and notifying unit;
the node information receiving unit is used for receiving the current resource state information reported by any type of node in the system;
and the interference suppression mode determining and notifying unit is used for determining an interference suppression mode and notifying the node A and the node B when determining that any node A in the any type of nodes, which is currently in the transmitting state, generates interference on any node B in the receiving state according to the information received by the node information receiving unit.
Preferably, the central processor is a separate device independent of the user equipment and the base station, or the central processor is a designated base station in the system.
The full-duplex cooperative transmission system comprises a base station, user equipment and a central processor;
the base station is used for communicating with the user equipment, reporting current resource state information to the central processor, and performing corresponding interference suppression processing according to an interference suppression mode notified by the central processor;
the user equipment is used for communicating with the base station, reporting current resource state information to the central processor and carrying out corresponding interference suppression processing according to an interference suppression mode notified by the central processor;
the central processor is configured to determine, according to information reported by the same type of node device in the base station or the user equipment, a suppression mode of interference when any node device a currently in a transmitting state in the type of node device generates interference to any node device B currently in a receiving state, and notify the node device a and the node device B.
According to the technical scheme, the full-duplex cooperative transmission system is provided with the central processor for receiving the current resource state information reported by a certain type of nodes in the system, and when a certain transmitting node in each similar type of node generates interference on a certain receiving node according to the information, the central processor determines a suppression mode aiming at the interference and informs the corresponding transmitting node and the corresponding receiving node; and the corresponding transmitting node and the receiving node carry out interference suppression according to the notification sent by the central processor. Through the mode, the central processor determines the current interference condition among the nodes of the same type, and informs the related nodes involved in the interference to carry out interference suppression, so that the interference among the nodes of the same type is effectively suppressed.
Drawings
Fig. 1 is a schematic diagram of the structure and information transmission of a full-duplex cooperative transmission system;
fig. 2 is a basic flowchart of the method for suppressing interference between nodes of the same type in the present application.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the structure and information transmission of a full-duplex cooperative transmission system in the present application. In fig. 1, two cooperating base stations are connected to a central processor (CU) via a backbone network, serving users in two cells (or sectors), respectively. Two base stations are respectively arrangedDenoted j, k, each base station has NbA root antenna; serving users p, q, each having N, on the same time-frequency resourceuA root antenna. The central processor can be an independent network node different from the base station and is responsible for signal processing tasks of all base stations connected with the central processor; or a base station with stronger signal processing capability is responsible for processing the signal processing tasks of the base station and all other base stations connected with the base station.
The system shown in fig. 1 may support multiple transmission modes, including:
1. transmission mode 1: user p and user q are in different transmit and receive states. For example, user p is receiving a downlink signal from base station j and user q is transmitting an uplink signal to base station k.
2. Transmission mode 2: some users are in full duplex communication. For example, user p transmits an uplink signal to base station j while receiving a downlink signal from base station j, and user q receives only a downlink signal from base station k.
3. Transmission mode 3: user p and user q are in full duplex communication. For example, user p transmits an uplink signal to base station j while receiving a downlink signal from base station j, and user q transmits an uplink signal to base station k while receiving a downlink signal from base station k.
As can be seen from the above, transmission mode 1 and transmission mode 2 can be regarded as a special case of transmission mode 3, i.e. part of the users are restricted to perform unidirectional communication only. The transmission mode is described by taking the transmission mode of the user equipment as an example, and the transmission mode of the base station is the same as that described above, and is not described herein again. The full duplex cooperative transmission method of the present invention will be described below with transmission mode 3 as an example.
Taking the uplink of the base station j and the downlink of the user p as an example, the received signals of the base station and the user terminal can be respectively expressed as:
wherein, at the base station end,representing the uplink transmission channel between user p and base station j, wpjRepresents the transmit precoding vector for user p,representing uplink data sent by the user p to the base station j;representing the uplink transmission channel between user q and base station j, wqkA transmit precoding vector representing the user q,representing uplink data sent by a user q to a base station k;representing the interference channel between base station k and base station j, wkqRepresents the transmit precoding vector for base station k,downlink data indicating that the base station k sends to the user q; n isjRepresenting the white Gaussian noise at the receiving end of the base station j, with a mean of zero and a variance ofAt the user's end, the user can select the user,indicating the downlink transmission channel, w, between base station j and user pjpRepresents the transmit precoding vector for base station j,indicating downlink data sent to the user p by the base station j;indicating the downlink transmission channel, w, between base station k and user pkqRepresents the transmit precoding vector for base station k,downlink data indicating that the base station k sends to the user q;representing the interference channel between user q and user p, wqkA transmit precoding vector representing the user q,representing uplink data sent by a user q to a base station k; n ispRepresenting the white Gaussian noise at the receiving end of the user p, the mean value is zero, and the variance is
The present application mainly suppresses the same-class node interference in the above formula (1) and formula (2), but suppresses the heterogeneous node interference out of the scope of the present application. Specifically, a base station j, a user p, a base station k, and a user q are all in a full duplex state, and for an uplink of the base station j, the base station j may receive a downlink signal sent to the user q by the base station k while receiving uplink data, where the downlink signal is similar node interference received by the base station j; for the downlink of the user p, while receiving the downlink data, the user p may receive an uplink signal sent by the user q to the base station k, where the uplink signal is the same type of node interference received by the user p.
The method for suppressing the interference of the nodes of the same type comprises processing on a node side and processing on a central processor side, wherein the two sides are mutually matched to realize the interference suppression among the nodes of the same type. For clarity, the following method description will describe the processing on the node side together with the processing on the central processor side. Fig. 2 is a general flowchart of a method for suppressing interference of nodes of the same type in the present application. As shown in fig. 2, the method includes:
step 201, any kind of node in the full-duplex cooperative transmission system reports the current resource state information to the central processor.
The node for performing the same-class node interference suppression may be a base station or a user equipment, and therefore, the node reporting the current resource state information in this step is also any one of the base station and the user equipment. The reported current resource status information may include: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof. Further, the base station may further carry the capacity and delay of the backbone network when reporting the current resource status information.
Step 202, the central processor determines the transmission mode of each node in the class node according to the received current resource state information of the class node.
According to the current resource status information reported by a certain type of node in step 201, the transmission mode, such as receiving or transmitting, of other nodes of the same type as the node is determined, which is used for determining the type and mode of interference of the same type. Wherein, the same kind of node refers to that all are base stations, or all are user equipments.
Step 203, when the central processor determines that a certain transmitting node belonging to the same kind of node generates interference to another receiving node, the central processor determines the suppression mode of the corresponding interference and informs the corresponding transmitting node and the corresponding receiving node.
The central processor can determine which nodes can generate the same type of inter-node interference according to the current resource state information reported by the nodes. For example, two nodes in different transmitting and receiving states, where the distance between the nodes is smaller than a specific value, may generate interference, or a node may detect similar interference generated by other nodes to itself, and report the same to the central processor through current resource state information. The method for determining the interference among the nodes of the same type by the central processor is not limited.
In the present application, the base station and the user equipment belong to different types of nodes, and the same type of nodes refer to both base stations or both user equipment. In addition, in the description of the present application, a transmitting node and a receiving node belong to the same type of node (for example, the transmitting node and the receiving node are both base stations, or the transmitting node and the receiving node are both user equipments), the transmitting node refers to a node currently in a transmitting state, and the receiving node refers to a node currently in a receiving state. For a half-duplex node, it can only be a transmitting node or a receiving node at a time, while for a full-duplex node, it can be both a transmitting node and a receiving node at a time.
The central processor can determine a corresponding interference suppression mode according to the current resource conditions of the transmitting node and the receiving node, for example, when the antenna resource of the receiving node is sufficient, the central processor can utilize multiple antennas of the receiving node to perform interference suppression among the same type of nodes, namely, perform interference suppression of the receiving node; when the antenna resource of the transmitting node is sufficient, the multi-antenna of the transmitting node can be utilized to carry out interference suppression among the nodes of the same type, namely the interference suppression of the transmitting node is carried out; alternatively, preprocessing and interference suppression may be performed at the transmitting node and the receiving node, respectively, and interference suppression may be performed jointly.
And step 204, the transmitting node and the receiving node carry out interference suppression according to the notification sent by the central processor.
And the transmitting node and the receiving node perform corresponding interference suppression processing according to the interference suppression mode notified by the central processor. For example, when interference suppression is performed on a receiving node, the receiving node designs a receiving equalizer according to the characteristic of a precoded equivalent interference channel between a transmitting node and the receiving node, and performs equalization processing on a received signal, so that interference generated by the transmitting node on the receiving node can be eliminated; when the interference suppression of the transmitting node is carried out, the transmitting node designs transmitting precoding according to the characteristics of an interference channel between the transmitting node and the receiving node, and suppresses the corresponding interference channel, so that the interference generated by the transmitting node on the receiving node can be eliminated; when joint interference suppression of a transmitting node and a receiving node is carried out, the central processor jointly designs precoding of the transmitting node and a receiving equalizer of the receiving node according to the characteristics of interference channels from the transmitting node to the receiving node, so that the interference generated by the transmitting node to the receiving node is eliminated; when the node is a base station, the interference suppression mode may also be data-based interference suppression, where the transmitting base station sends downlink data (including precoding information) to the receiving base station through the backbone network, the receiving base station reconstructs a precoded downlink signal of the transmitting base station after acquiring the characteristics of an interference channel between the transmitting base station and the receiving base station, and subtracts the downlink signal sent by the transmitting base station from a total air interface received signal.
So far, the flow of the method for suppressing interference between nodes of the same type in the present application is finished. As described above, the inter-node interference suppression of the same kind in the present application may be applied to a base station to perform inter-base station interference suppression, or may be applied to a user equipment to perform inter-user equipment interference suppression. The interference suppression between base stations and the interference suppression between user equipments are described below, and the detailed description will be made for different interference suppression types.
Interference suppression of base station
The following describes suppression of interference from base station k to base station j by the method of the present application, taking the system configuration shown in fig. 1 as an example.
A. Interference suppression for transmitting base station
Preferably, when the antenna resource of the transmitting base station k is sufficient, the interference between the base stations can be suppressed by using the preprocessing of the transmitting base station, and the specific process is as follows:
step 301, each base station reports the current resource status information of the base station to the central processor.
The current resource status information may include information such as antenna resource usage status, half/full duplex type, load status, capacity and delay of backbone network, and interference level.
Step 302, the central processor determines the transmission mode of each base station; when the transmitting base station k generates interference to the receiving base station j, the transmitting base station k preprocesses the transmitting signal and issues a corresponding cooperation instruction to the transmitting base station and the receiving base station.
Step 303, after receiving the cooperation instruction from the central processor, the base station k obtains the interference channel characteristics from the base station k to the base station j.
Specifically, the manner of obtaining the characteristics of the interference channels from the base station k to the base station j may be: when inter-base-station channels are reciprocal, it is possible to estimate the interference channel from base station j to base station k by sending a dedicated training sequence from base station j to base station kAs characteristics of interfering channels from base station k to base station jOr whether the channels between the base stations are reciprocal or not, the base station k can also send a special training sequence to the base station j for the base station j to estimate the interference channel from the base station k to the base station jThe interfering channels are then paired by base station jQuantizes and feeds back to base station k using dedicated signaling, thereby allowing base station k to obtain its interference channel to base station j
Step 304, the base station k based on the obtained interference channelDesigning transmit precoding wkqTransmitting the transmission signal after precoding, for suppressing pairInterference of base station j.
B. Interference suppression for receiving base station
Preferably, when the antenna resource of the receiving base station j is sufficient, the interference between the base stations can be suppressed by using coherent detection of the receiving base station, and the specific process is as follows:
step 401, each base station reports the current resource status information of the base station to the central processor.
The current resource status information may include information such as antenna resource usage status, half/full duplex type, load status, capacity and delay of backbone network, and interference level.
Step 402, the central processor determines the transmission mode of each base station; when the transmitting base station k generates interference on the receiving base station j, the receiving base station j is determined to suppress the received interference signal, and corresponding cooperation instructions are issued to the transmitting base station and the receiving base station.
Step 403, after receiving the cooperation instruction from the central processor, the base station k sends a dedicated training sequence to the base station j for the base station j to estimate the equivalent interference channel from the base station k to the base station j after transmitting and precoding
In order to estimate the equivalent interference channel, the dedicated training sequence sent by the base station k to the base station j is a precoded dedicated training sequence.
Step 404, the base station j obtains the equivalent interference channel based on the obtained equivalent interference channelDesigning a receive equalizerThe received signal is equalized to suppress interference from base station k.
C. Joint interference suppression for transmitting and receiving base stations
Generally, the transmitting base station k and the receiving base station j may perform joint interference suppression, which includes the following specific processes:
step 501, each base station reports the current resource status information of the base station to the central processor.
The current resource status information may include information such as antenna resource usage status, half/full duplex type, load status, capacity and delay of backbone network, and interference level.
Step 502, the central processor determines the transmission mode of each base station; and when the transmitting base station k generates interference on the receiving base station j, determining that the transmitting base station and the receiving base station jointly complete interference suppression, and issuing corresponding cooperation instructions to the transmitting base station and the receiving base station.
Step 503, after receiving the cooperation instruction of the central processor, the base station k or the base station j obtains the characteristics of the interference channel from the base station k to the base station j, and transmits the characteristics to the central processor through the backbone network.
The method for obtaining the interference channel characteristics of the base stations k to j by the base station k or the base station j may adopt the method in step 303, that is, the base station k may estimate the interference channel characteristics of the base stations j to k according to the channel reciprocity between the base stations and the special training sequence sent by the base station jAs characteristics of interfering channels from base station k to base station jAlternatively, base station j may estimate the interference channel characteristics from base station k to base station j based on the dedicated training sequence transmitted by base station k
Step 504, the central processor based on the obtained interference channelJoint design base station k transmit precoding wkqAnd a receiving equalizer of base station jAnd precoding the designed transmission wkqAnd a receiving equalizerAnd respectively transmitting the interference signals to the base station k and the base station j, and combining the interference of the base station k to the base station j.
Step 505, the base station k transmits precoding w according to the central processorkqSending the data after precoding, and the base station j sends the data according to a receiving equalizer issued by a central processorAnd carrying out equalization processing on the received signal.
D. Interference suppression based on data sharing
Preferably, when the backbone network capacity is large and the delay is low, the interference suppression can be completed at the receiving base station by using data sharing between the base stations, and the specific process is as follows:
step 601, each base station reports the current resource state information of the base station end to the central processor.
The current resource status information may include information such as antenna resource usage status, half/full duplex type, load status, capacity and delay of backbone network, and interference level.
Step 602, the central processor determines the transmission mode of each base station; when the transmitting base station k generates interference on the receiving base station j, the interference suppression is determined to be completed at the receiving base station end by utilizing data sharing among the base stations, and corresponding cooperation instructions are issued to the transmitting base station and the receiving base station.
Step 603, after receiving the cooperation instruction of the central processor, there are two cooperation modes:
1. the base station k transmits the precoded downlink signalTransmitted to base station j via the backbone network, or the transmission can be precoded w separatelykqAnd raw dataTransmitting to a base station j through a backbone network; meanwhile, base station k sends a dedicated training sequence to base station j for base station j to estimate the interference channel to base station kThe base station j determines the pre-coded downlink signal by using the information transmitted from the backbone network(it can be directly receiving the pre-coded downlink signalOr precoding w by transmittingkqAnd raw dataReconstructing a downlink signal) And then according to the precoded downlink signal and the interference channel from the base station k to the downlink signal obtained by estimationReconstructing its received interference signalAnd subtracted directly from the total received signal.
2. Collaboration on receipt central processorAfter the instruction, the base station k transmits the original dataTransmitting to a base station j through a backbone network; meanwhile, the base station k sends a special training sequence subjected to transmission precoding to the base station j for the base station j to estimate an equivalent interference channel from the base station k to the base station j after precodingThe base station j utilizes the original data transmitted by the backbone networkAnd estimated equivalent interference channel from base station k to itReconstructing its received interference signalAnd subtracted directly from the total received signal.
The method for suppressing the interference between the base stations on the base station side is concretely realized. A specific implementation of the method for inter-user equipment interference suppression is described below.
Interference suppression between user equipments
A specific implementation of suppressing interference of user q to user p will be described with reference to the system configuration shown in fig. 1 as an example. When interference suppression is performed between user equipments, it is necessary to perform transmission of related information between the user equipments and the central processor, where the transmission between the user equipments and the central processor is performed through a base station to which the user equipments belong.
A. Interference suppression for transmitting users
Preferably, when the antenna resource of the transmitting user q is sufficient, the multi-antenna of the transmitting user may be used to suppress the interference between user nodes, the method is similar to the interference suppression at the base station, and the interference suppression of the transmitting user specifically has the following two implementation manners according to whether the channel between the interfering users is reciprocal:
the first method is as follows: channel reciprocity between interfering users
In step 701, the users report their current resource status information to the base station.
The current resource status information may include antenna resource usage status, half/full duplex type, load status, and interference level, among others.
Step 702, the base station reports the reported information of each user to the central processor.
703, the central processor determines the transmission mode of each user; when the transmitting user q generates interference to the receiving user p, the interference suppression by using the multiple antennas of the transmitting user end is determined, corresponding instructions are issued to each base station, and the instructions are sent to respective users by each base station.
Step 704, through the dedicated signaling, the base station j sends the ID information of the user p and the uplink training sequence configuration information to the base station k, and then the base station k sends the ID information and the uplink training sequence configuration information to the user q.
Step 705, user q estimates the interference channel to user p by receiving the uplink training sequence of user p according to the uplink training sequence configuration information of user p and by using reciprocity between channels
Step 706, user q based on the obtained interference channelDesigning transmit precoding wqkAnd the data to be transmitted is transmitted after being precoded, and is used for suppressing the interference to the user p.
The second method comprises the following steps: channel nonreciprocal between interfering users
Step 801, the user reports the current resource status information to the base station.
The current resource status information may include antenna resource usage status, half/full duplex type, load status, and interference level, among others.
Step 802, the base station reports the report information of each user to the central processor.
Step 803, the central processor determines the transmission mode of each user; when the transmitting user q generates interference to the receiving user p, the interference suppression by using the multiple antennas of the transmitting user end is determined, corresponding instructions are issued to each base station, and the instructions are sent to respective users by each base station.
Step 804, through the dedicated signaling, the base station k sends the ID information of the user q and the uplink training sequence configuration information to the base station j, and then the base station j sends the ID information and the uplink training sequence configuration information to the user p.
Step 805, according to the uplink training sequence configuration information of user q, user p estimates the interference channel from user q to user q by receiving the uplink training sequence of user qAnd the quantized data is fed back to a user q. The feedback mode of the interference channel can be direct feedback or indirect feedback:
a. direct feedback: user p directly transmits quantized interference channels through dedicated signaling interaction between usersSending to a user q;
b. indirect feedback: by dedicated signalling, user p first quantizes the interfering channelFeeding back to the base station j, transmitting the interference channel to the base station k by the base station j, and finally transmitting the interference channel to the base station k by the base station kAnd sending the data to a user q.
Step 806, user q based on the obtained interference channelDesigning a precoding vector wqkAnd the data to be transmitted is transmitted after being precoded, and is used for suppressing the interference to the user p.
B. Interference suppression for receiving users
Preferably, when the antenna resource of the receiving user p is sufficient, the multi-antenna of the receiving user may be used to suppress the inter-user-node interference, which is specifically as follows:
in step 901, the users report their current resource status information to the base station.
The current resource state information may include an antenna resource usage status, a half/full duplex type, a load state, and an interference level;
step 902, the base station reports the report information of each user to the central processor.
Step 903, the central processor determines the transmission mode of each user; when a transmitting user q generates interference on a receiving user p, determining to utilize the multiple antennas of the receiving user side to suppress the interference, and issuing instructions to each base station, and then each base station sends the instructions to each user.
Step 904, through the dedicated signaling, the base station k sends the ID information of the user q, the uplink training sequence configuration information, and the precoding information to the base station j, and then the base station j sends the information to the user p.
Step 905, according to the uplink training sequence configuration information of the user q, the user p estimates the equivalent interference channel from the user q to the user p after the transmission precoding by receiving the uplink training sequence of the user q
WhereinEstimating the interference channel characteristic from the user q to the user p by the user p according to the uplink training sequence sent by the user q, and then utilizing the precoding information wqkAnd interference channel characteristicsEstimating a precoded equivalent interference channel
Step 906, the user p obtains the equivalent interference channel according to the obtained equivalent interference channelDesigning a receive equalizer vpAnd carrying out equalization processing on the received signal for suppressing the interference of the user q to the user p.
C. Joint interference suppression for transmitting and receiving users
More generally, the transmitting user and the receiving user can respectively perform preprocessing and receive interference suppression, and jointly complete interference suppression, specifically, the following process is performed:
step 1001, the users report their current resource status information to the base station.
The current resource status information may include antenna resource usage status, half/full duplex type, load status, and interference level, among others.
Step 1002, the base station reports the report information of each user to the central processor.
Step 1003, the central processor determines the transmission mode of each user; when the transmitting user q generates interference on the receiving user p, the transmitting user and the receiving user are determined to jointly complete interference suppression, and an instruction is issued to each base station, and each base station sends the instruction to each user.
Step 1004, through the dedicated signaling, the base station k sends the ID information of the user q and the uplink training sequence configuration information to the base station j, and then the base station j sends the ID information and the uplink training sequence configuration information to the user p.
Step 1005, user p estimates the interference channel from user q to user q by receiving the uplink training sequence of user q according to the uplink training sequence configuration information of user qAnd will interfere with the channel by dedicated signallingAnd feeding back to the base station j, and further transmitting to the central processor.
Of course, when the channels between users are reciprocal, the step may also be performed by estimating, by the user q, an interference channel from the user p to the user q according to the uplink training sequence of the user p, and sending the interference channel to the central processor through the base station to which the user q belongs. Correspondingly, in step 1004, the base station j sends the ID information of the user p and the uplink training sequence configuration information to the base station k, and then the base station k sends the ID information and the uplink training sequence configuration information to the user q.
Step 1006, the central processor jointly designs the transmitting precoding w according to the obtained informationqkAnd a receiving equalizerAnd precoding the transmission w by base station kqkTransmitting to user q, receiving equalizer through base station jAnd transmitting the signal to the user p for jointly suppressing the interference of the user q to the user p.
Step 1007, user q transmits precoding w according to base station kqkThe transmission data is transmitted after being precoded, and the user p transmits according to the base station jAnd carrying out equalization processing on the received signal.
The above is a flow of the method for interference suppression between user equipments in the present application.
The application also provides a full-duplex cooperative transmission system, node equipment in the system and a central processor. Specifically, the full-duplex cooperative transmission system may include a central processor, a base station, and a user equipment as shown in fig. 1. The central processor is configured to determine, according to information reported by the same type of node device in the base station or the user equipment, an interference suppression mode when any node device a currently in a transmitting state in the type of node device generates interference to any node device B currently in a receiving state, and notify the node device a and the node device B. The node device a and the node device B may both be base stations, or may both be user equipments.
Specifically, the central processor may further include a node information receiving unit, an interference suppression manner determining and notifying unit. The node information receiving unit is used for receiving the current resource state information reported by any type of node in the system. And the interference suppression mode determining and informing unit is used for determining the interference suppression mode and informing the node A and the node B when determining that any node A in any type of node, which is currently in a transmitting state, generates interference on any node B which is currently in a receiving state according to the information received by the node information receiving unit.
The base station and the user equipment in the full-duplex cooperative transmission system are communicated with each other, and further, in order to perform interference suppression of the same kind of nodes, the base station and the user equipment are also used for reporting current resource state information to the central processor and performing corresponding interference suppression processing according to an interference suppression mode notified by the central processor.
When performing interference suppression processing on the same type of node, both the base station and the user equipment may be regarded as node equipment, and the specific structure may include: the device comprises an information reporting unit, an interference suppression mode determining unit and an interference suppression processing unit. The information reporting unit is used for reporting the current resource state information of the information reporting unit to a central processor in the system. And the interference suppression mode determining unit is used for receiving the interference suppression mode determined by the central processor. And the interference suppression processing unit is used for carrying out interference suppression processing according to the interference suppression mode.
As described above, in the full-duplex cooperative transmission system, interference between nodes of the same type can be effectively suppressed, so that system performance is effectively improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (38)

1. The method for suppressing the interference among the similar nodes in the full-duplex cooperative transmission is characterized by comprising the following steps:
a first node in a full-duplex cooperative transmission system reports current resource state information of the first node to a central processor in the system;
the first node receives the interference suppression mode determined by the central processor and carries out interference suppression processing;
the central processor determines that the first node is an uplink or downlink data sender at present according to the information reported by the first node and the second node, and determines the interference suppression mode when the first node generates interference on the second node; or, the central processor determines that the first node is currently an uplink or downlink data receiver according to the information reported by the first node and the second node, and determines the interference suppression mode when the second stage is applied to the first node; the first node and the second node are both base stations, or the first node and the second node are both user equipment.
2. The method of claim 1, wherein when the interference suppression mode of reception is interference suppression of a transmitting node,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: acquiring the characteristics of an interference channel between the second node and the first node, determining a precoding matrix according to the characteristics of the interference channel, and precoding and transmitting the transmission data;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: transmitting a training sequence for the second node to estimate the characteristics of an interference channel; or, the first stage estimates the characteristics of the interference channel according to the training sequence sent by the second node, and sends the characteristics to the second node.
3. The method of claim 2, wherein if the first node is currently an uplink or downlink data sender, the obtaining the characteristics of the interference channel between the second node and the first node comprises:
the first node estimates the characteristics of the interference channel according to a training sequence sent by the second node; or,
receiving the characteristics of the interference channel transmitted by the second node.
4. The method of claim 1, wherein when the received interference suppression mode is interference suppression of a receiving node,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: transmitting a pre-coded training sequence for the second node to estimate the equivalent interference channel characteristics, wherein a pre-coding matrix of the training sequence is the same as a pre-coding matrix of uplink or downlink transmission data of any node;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: and receiving the pre-coded training sequence sent by the second node, estimating the characteristics of an equivalent interference channel, determining a receiving equalizer according to the characteristics of the equivalent interference channel, and performing equalization processing on the received data.
5. The method of claim 1, wherein when the interference suppression scheme received is joint interference suppression,
if the first node is currently an uplink or downlink data sender, the processing of interference suppression by the first node includes: sending a training sequence, receiving the transmitting precoding issued by the central processing node, and sending the data after precoding the data; or receiving a training sequence sent by the second node, estimating the characteristics of an interference channel between the first node and the second node, reporting the characteristics to the central processing node, receiving a transmission precoding sent by the central processing node, and sending the transmission precoding after precoding the sending data;
if the first node is currently an uplink or downlink data receiver, the processing of the first node for interference suppression includes: receiving a training sequence sent by the second node, estimating the characteristics of an interference channel between the first node and the second node, reporting the characteristics to the central processing node, receiving a receiving equalization mode sent by the central processing node, and performing equalization processing on received data; or, sending a training sequence, receiving a receiving equalization mode issued by the central processing node, and performing equalization processing on received data;
wherein, the transmitting pre-coding or the receiving equalization mode is determined by the central processor according to the received interference channel characteristics.
6. The method of claim 1, wherein the first node is a base station, and wherein when the received interference suppression mode is data sharing-based interference suppression,
if the first node is currently a downlink data sender, the processing of interference suppression by the first node includes: the first node sends downlink data and a special training sequence thereof to the second node through a backbone network;
if the first node is used as an uplink data receiver, the processing of the first node for interference suppression includes: the first node receives downlink data and a special training sequence sent by the second node, estimates the characteristics of an interference channel from the second node to the first node, reconstructs an interference signal from the second node received by the first node at an air interface, and subtracts the interference signal from a total received signal of the air interface.
7. The method of claim 6, wherein when the first node is currently a downlink data sender, the downlink data sent by the first node through the backbone network is: the precoded downlink signal, or the original downlink data and the precoding information sent by the air interface.
8. The method according to any of claims 1 to 7, wherein when the first node is a base station, the training sequence is a dedicated training sequence dedicated to estimating inter-base station interference.
9. The method of claim 2, 3 or 5, wherein when the first node is a user equipment, the training sequence is an uplink training sequence;
before the first node estimates the characteristics of the interference channel, further receiving, by the base station to which the first node belongs, ID information of the second node and configuration information of an uplink training sequence, which are sent by the base station to which the second node belongs; and estimating the characteristics of the interference channel according to the uplink training sequence determined by the configuration information.
10. The method of claim 4, wherein when the first node is a UE, the training sequence is an uplink training sequence;
if the first node is currently an uplink or downlink data receiver, when the first node performs interference suppression processing, before estimating the equivalent interference channel characteristics, the first node further receives, through its own base station, ID information of the second node, configuration information of an uplink training sequence, and precoding information of the second node, which are sent by the own base station of the second node; and estimating the equivalent interference channel characteristics according to the uplink training sequence determined by the configuration information and the precoding information of the second node.
11. The method according to any of claims 1 to 7, wherein when the first node is a user equipment, the interaction between the first node and a central processor is performed through a base station to which the first node belongs.
12. The method according to any of claims 1 to 7, wherein the current resource status information comprises: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
13. The method of claim 12, wherein the current resource status information further comprises capacity and latency of a backbone network when the first node is a base station.
14. The method for suppressing the interference among the similar nodes in the full-duplex cooperative transmission is characterized by comprising the following steps:
a central processor in a full-duplex cooperative transmission system receives current resource state information reported by any type of nodes in the system; the any type of node is a base station or user equipment;
and when the central processor determines that any node A in the transmitting state generates interference on any node B in the receiving state according to the received information, determining an interference suppression mode and informing the node A and the node B.
15. The method of claim 14, wherein the central processor determines the interference to be suppressed by a transmitting node;
the interference suppression by the transmitting node comprises: the node A acquires the characteristics of an interference channel between the node A and the node B, and determines a transmission precoding used for inhibiting the characteristics of the interference channel, and the node A performs precoding on transmission data by using the transmission precoding and then transmits the data.
16. The method of claim 14, wherein the central processor determines the interference to be suppressed by interference suppression at the receiving node;
the interference suppression by the receiving node comprises: and the node B estimates the characteristics of the equivalent interference channel from the node A to the node B after transmitting and precoding according to the precoded training sequence sent by the node A, determines a receiving equalization mode according to the characteristics of the equivalent interference channel, and performs equalization processing on the received signal according to the receiving equalization mode.
17. The method of claim 14, wherein the central processor determines the interference suppression mode to be joint interference suppression;
after the central processor notifies the node A and the node B to perform joint interference suppression, the central processor further receives the interference channel characteristics between the node A and the node B fed back by the node A or the node B, determines the transmission precoding mode of the node A and the receiving equalization mode of the node B, and notifies the node A and the node B respectively;
the joint interference suppression comprises: and the node A performs precoding on the transmitted data according to the transmitting precoding notified by the central processor and then transmits the data, and the node B performs equalization processing on the received data according to the receiving equalization mode notified by the central processor.
18. The method of claim 14, wherein any of the nodes is a base station, and the central processor determines the interference suppression mode to be data sharing-based interference suppression;
the data sharing based interference mitigation comprises: the node A sends the precoded downlink signal sent by the node A or the sent downlink data and precoding information to the node B through a backbone network, the node B estimates the characteristics of an interference channel from the node A to the node B, reconstructs the interference signal from the node A received by the node B at an air interface, and directly subtracts the interference signal from the total received signal of the air interface.
19. The method according to any of claims 14 to 18, wherein the current resource status information comprises: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
20. The method of claim 19, wherein the current resource status information further comprises capacity and delay of backbone network when the any type of node is a base station.
21. The method according to any of claims 14 to 18, wherein when said any kind of node is a user equipment, the information transmission between said central processor and said node a or said node B is performed through a base station to which said node a or said node B belongs.
22. The method for suppressing the interference among the similar nodes in the full-duplex cooperative transmission is characterized by comprising the following steps:
a central processor in a full-duplex cooperative transmission system receives current resource state information reported by any type of nodes in the system; the any type of node is a base station or user equipment;
when the central processor determines that any node A in a transmitting state currently generates interference on any node B in a receiving state currently in any type of nodes according to the received information, determining a suppression mode of the interference, and informing the node A and the node B;
and the node A and the node B carry out interference suppression according to the notification sent by the central processor.
23. The method of claim 22, wherein the central processor determines the interference to be suppressed by a transmitting node;
the performing the interference suppression by the node a and the node B includes: the node A acquires the characteristics of an interference channel between the node A and the node B, determines a transmitting precoding used for inhibiting the characteristics of the interference channel, and transmits the data after precoding the data by using the transmitting precoding.
24. The method of claim 23, wherein the node a obtaining the characteristics of the interference channel between the node a and the node B comprises: the node A estimates the characteristics of an interference channel between the node B and the node A according to a training sequence sent by the node B; or, the node B estimates the characteristics of the interference channel between the node B and the node a according to the training sequence sent by the node a, and sends the characteristics to the node a.
25. The method of claim 24, wherein when the any type of node is a base station, the training sequences sent by the node a and the node B are dedicated training sequences; and/or the presence of a gas in the gas,
when any type of node is user equipment, the training sequences sent by the node A and the node B are respective uplink training sequences; the node a receives, through its base station, the ID information and the uplink training sequence configuration information of the node B sent by its base station, and the node B receives, through its base station, the ID information and the uplink training sequence configuration information of the node a sent by its base station.
26. The method of claim 22, wherein the central processor determines the interference to be suppressed by interference suppression at the receiving node;
the performing the interference suppression by the node a and the node B includes: and the node B estimates the characteristics of the equivalent interference channel from the node A to the node B after transmission precoding, determines a receiving equalization mode according to the characteristics of the equivalent interference channel and performs equalization processing on a received signal.
27. The method of claim 26, wherein when the any node is a base station, the node B estimating the equivalent interference channel characteristics comprises: the node B receives the special training sequence sent by the node A and estimates the equivalent interference channel characteristic; and/or the presence of a gas in the gas,
when any of the nodes is a user equipment, the node B estimating the equivalent interference channel characteristics comprises: the node B receives the uplink training sequence of the node A and estimates the equivalent interference channel characteristic according to the precoding information of the node A; and the node B receives the ID information of the node A, the configuration information of the uplink training sequence and the precoding information which are sent by the base station to which the node A belongs through the base station to which the node B belongs.
28. The method of claim 22, wherein the central processor determines the interference suppression mode as joint interference suppression, further receives the characteristics of the interference channel between the node B and the node a fed back from the node B or the node a, determines the transmit precoding of the node a and the receive equalization mode of the node a, and notifies the node a and the node B respectively;
the interference suppression by the node A and the node B comprises: and the node A performs precoding on the transmitted data according to the transmitting precoding notified by the central processor and then transmits the data, and the node B performs equalization processing on the received data according to the receiving equalization mode notified by the central processor.
29. The method according to claim 28, wherein when the any type of node is a base station,
the node B feeding back the characteristics of the interference channel between the two comprises: the node B estimates the characteristics of an interference channel from the node A to the node B according to the special training sequence sent by the node A and sends the characteristics to the central processor;
the node A feeding back the characteristics of the interference channel between the two nodes comprises: and the node A estimates the characteristics of an interference channel from the node B to the node A according to the special training sequence sent by the node B and sends the characteristics to the central processor.
30. The method according to claim 28, wherein when the any type of node is a user equipment,
the node B feeding back the characteristics of the interference channel between the two comprises: the node B receives the uplink training sequence of the node A, estimates the characteristics of an interference channel from the node A to the node B, and sends the characteristics to the central processor through a base station to which the node B belongs; the node B receives ID information of the node A and configuration information of an uplink training sequence sent by a base station to which the node A belongs through the base station to which the node B belongs;
the node A feeding back the characteristics of the interference channel between the two nodes comprises: the node A estimates the characteristics of an interference channel from the node B to the node A according to an uplink training sequence sent by the node B and sends the characteristics to the central processor; and the node A receives the ID information of the node B and the configuration information of the uplink training sequence sent by the base station to which the node B belongs through the base station to which the node A belongs.
31. The method of claim 22, wherein any of the nodes is a base station, and the central processor determines the interference suppression mode to be data sharing-based interference suppression;
the interference suppression by the node A and the node B comprises: the node A sends the precoded downlink signal sent by the node A or the sent downlink data and precoding information to the node B through a backbone network, the node B estimates the characteristics of an interference channel from the node A to the node B, reconstructs the interference signal from the node A received by the node B at an air interface, and directly subtracts the interference signal from the total received signal of the air interface.
32. The method according to any of claims 22 to 31, wherein the current resource status information comprises: antenna resource usage, half/full duplex type, load status, interference level, or any combination thereof.
33. The method of claim 32, wherein the current resource status information further comprises capacity and delay of backbone network when the any type of node is a base station.
34. The method according to any of claims 22 to 31, wherein when said any kind of node is a user equipment, the information transmission between said central processor and node a or said node B is performed through a base station to which said node a or said node B belongs.
35. Node device in full duplex cooperative transmission, characterized in that the node device comprises: the device comprises an information reporting unit, an interference suppression mode determining unit and an interference suppression processing unit;
the information reporting unit is used for reporting the current resource state information of the information reporting unit to a central processor in the system;
the interference suppression mode determining unit is used for receiving the interference suppression mode determined by the central processor;
the interference suppression processing unit is used for carrying out interference suppression processing according to the interference suppression mode;
the central processor determines the interference suppression mode when the first node equipment is determined to be an uplink or downlink data sender currently and the first node equipment generates interference on the second node equipment according to the information reported by the first node equipment and the second node equipment; or, the central processor determines that the first node device is currently an uplink or downlink data receiver according to the information reported by the first node device and the second node device, and determines the interference suppression mode when the second node device interferes with the first node device; the first node device and the second stage device are both base stations, or the first stage device and the second stage device are both user equipment.
36. A central processor in a full duplex cooperative transmission system, the central processor comprising: a node information receiving unit and an interference suppression mode determining and notifying unit;
the node information receiving unit is used for receiving the current resource state information reported by any type of node in the system;
and the interference suppression mode determining and notifying unit is used for determining an interference suppression mode and notifying the node A and the node B when determining that any node A in the any type of nodes, which is currently in the transmitting state, generates interference on any node B in the receiving state according to the information received by the node information receiving unit.
37. The central processor of claim 36, wherein the central processor is a separate device independent of the user equipment and the base station, or wherein the central processor is a designated base station in the system.
38. The full-duplex cooperative transmission system is characterized by comprising a base station, user equipment and a central processor;
the base station is used for communicating with the user equipment, reporting current resource state information to the central processor, and performing corresponding interference suppression processing according to an interference suppression mode notified by the central processor;
the user equipment is used for communicating with the base station, reporting current resource state information to the central processor and carrying out corresponding interference suppression processing according to an interference suppression mode notified by the central processor;
the central processor is configured to determine, according to information reported by the same type of node device in the base station or the user equipment, a suppression mode of interference when any node device a currently in a transmitting state in the type of node device generates interference to any node device B currently in a receiving state, and notify the node device a and the node device B.
CN201410076883.4A 2014-03-04 2014-03-04 Method for suppressing interference between same kinds of nodes in full duplex cooperative transmission Pending CN104902485A (en)

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