WO2015109495A1

WO2015109495A1 - Method for measuring channel state information and network node

Info

Publication number: WO2015109495A1
Application number: PCT/CN2014/071258
Authority: WO
Inventors: 田春长
Original assignee: 华为技术有限公司
Priority date: 2014-01-23
Filing date: 2014-01-23
Publication date: 2015-07-30
Also published as: CN106061573A; CN106061573B

Abstract

Provided are a method for measuring channel state information and a network node. The method comprises: sending, by a first node, a reference signal resource allocation message to a measurement node group, wherein the first node manages the measurement node group which comprises a plurality of second nodes, and the reference signal resource allocation message comprises an identity identifier of a node used for sending a reference signal in the plurality of second nodes, and resource indication information about a resource that needs to be used when a reference signal for performing a CSI measurement is sent; and receiving a CSI measurement result sent by a plurality of second nodes except for the node sending the reference signal in the measurement node group, the CSI measurement result being fed back by the plurality of second nodes except for the node sending the reference signal in the measurement node group after receiving the reference signal and performing the CSI measurement based on the reference signal. Thus, the CSI measurement efficiency in a wireless backhaul network is improved.

Description

Method for measuring channel state information and network node

Technical field

Embodiments of the present invention relate to communication technologies, and in particular, to channel state information (Channel State)

Information, referred to as: CSI) measurement method and network node. Background technique

As the capacity requirements of wireless systems increase, the minimization of small stations is one of the main technical directions to cope with this capacity demand. However, deploying dense nodes has many practical difficulties. Among them, how to solve the backhaul problem of a large number of small nodes is one of the most critical issues. The backhaul usually refers to the transmission channel connected from the access point (AP) to the core network (Core Net, referred to as CN).

The wireless backhaul method implements backhaul through wireless signal transmission between small nodes. In a wireless network that includes two types of nodes, in order to better implement topology control of a mesh network composed of small nodes, it is necessary to measure CSI between small nodes, in Long Term Evolution (LTE). In the system, a dedicated reference signal is defined to support CSI measurement, and the base station can configure a specific reference signal resource for the terminal to complete the corresponding measurement, and the base station can configure multiple sets of CSI measurement processes for the same terminal.

In a wireless network including multiple nodes, the above measurement scheme is not applicable to the case where the node transmitting the reference signal instruction and the node transmitting the reference signal are not the same node, and in order to support flexible adjustment of the network topology, it is necessary to measure any two. The CSI between nodes is in the scenario of densely deploying small nodes. Due to the large number of small nodes, the measurement of CSI measurement between the two is very large, and the measurement efficiency is low. Summary of the invention

Embodiments of the present invention provide a method for measuring channel state information and a network node, so as to improve measurement efficiency of CSI in a wireless backhaul network.

In a first aspect, an embodiment of the present invention provides a network node, including:

a sending module, configured to send a reference signal resource allocation message to the measurement node group, where The network node manages the measurement node group, the measurement node group includes a plurality of second nodes, and the reference signal resource allocation message includes identifiers of nodes of the second node for transmitting reference signals. And resource indication information of a resource to be used when transmitting a reference signal for performing channel state information CSI measurement;

a receiving module, configured to receive CSI measurement results that are sent by the multiple second nodes except the node that sends the reference signal in the measurement node group; the CSI measurement result is sent in the measurement node group A plurality of the second nodes outside the node of the reference signal are fed back after receiving the reference signal and performing CSI measurement based on the reference signal.

In a first possible implementation manner of the first aspect, the sending module is specifically configured to monitor a service load state of the multiple second nodes in the measurement node group; When the service load state of the second node is less than a preset threshold, the reference signal resource allocation message is sent to multiple second nodes in the measurement node group.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a second possible implementation, the reference signal resource allocation message further includes a measurement level threshold, so that the measurement node group is A plurality of the second nodes determine whether to feed back the CSI measurement result according to the measurement level threshold.

With reference to the first aspect to the second possible implementation of the first aspect, in a third possible implementation, the reference signal resource allocation message further includes a measurement process restart identifier; After the node that sends the reference signal in the measurement node group receives the measurement process restart identifier, the CSI measurement and feedback need not be performed in the measurement process until the measurement process restart identifier is received again; And the measuring process includes the CSI measurement multiple times, and the reference signal is sent by different nodes in the measurement node group in each of the CSI measurements.

In a second aspect, an embodiment of the present invention provides a network node, including:

a receiving module, configured to receive a reference signal resource allocation message sent by the first node, where the reference signal resource allocation message includes an identity of a node for transmitting the reference signal, and a reference signal for performing channel state information CSI measurement The resource indication information of the resource to be used; wherein the first node manages the measurement node group, the measurement node group includes a plurality of second nodes; and the plurality of second nodes include the network node;

a sending module, configured to: if it is determined that the identity identifier is the same as its own identity, Transmitting the reference signal on the resource indicated by the resource indication information, so that the multiple second nodes in the measurement node group that receive the reference signal are performed based on the reference signal

The CSI measures and feeds back the CSI measurement results to the first node.

In a first possible implementation manner of the second aspect, the sending module is further configured to: after determining that the identity identifier is different from the identity of the user, after receiving the reference signal, based on the reference The signal performs the CSI measurement and feeds back the CSI measurement result to the first node.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner, the reference signal resource allocation message further includes a measurement level threshold;

Correspondingly, the sending module is configured to: after receiving the reference signal, perform the CSI measurement based on the reference signal, and determine whether the CSI measurement result is lower than the measurement level threshold;

If the CSI measurement result is lower than the measurement level threshold, the out-of-range indication information is fed back to the first node; or the CSI measurement result is not fed back to the first node;

And if the CSI measurement result is not lower than the measurement level threshold, the CSI measurement result is fed back to the first node.

With reference to the second aspect to the second possible implementation of the second aspect, in a possible implementation manner of the third aspect, the reference signal resource allocation message further includes a measurement process restart identifier;

The sending module is specifically configured to: after receiving the reference signal, and the receiving module receives the measurement process restart identifier, the CSI measurement and feedback are not required to be performed in the measurement process, until the receiving the The measurement process restarts the identifier; wherein the measurement process includes the CSI measurement multiple times, and the reference signal is sent by different nodes in the measurement node group in each of the CSI measurements.

In a third aspect, an embodiment of the present invention provides a method for measuring channel state information, including: a first node sending a reference signal resource allocation message to a measurement node group, where the first node manages the measurement node group, The measurement node group includes a plurality of second nodes, where the reference signal resource allocation message includes an identity of a node of the second node for transmitting a reference signal, and a CSI for transmitting channel state information. Resource indication information of the resource to be used when referring to the signal;

Receiving, by the first node, a node of the measurement node group other than the node that sends the reference signal a plurality of CSI measurement results fed back by the second node; the CSI measurement result is that the plurality of the second nodes in the group of measurement nodes except the node transmitting the reference signal are receiving the reference Signaling, and performing feedback after CSI measurement based on the reference signal.

In a first possible implementation manner of the third aspect, the sending, by the first node, the reference signal resource allocation message to the measurement node group includes:

The first node monitors a service load status of the plurality of the second nodes in the measurement node group; when the service load status of the plurality of the second nodes in the measurement node group is smaller than a preset gate The reference signal resource allocation message is sent to a plurality of the second nodes in the measurement node group for a time limit.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner, the reference signal resource allocation message further includes a measurement level threshold, so that the measurement node group is A plurality of the second nodes determine whether to feed back the CSI measurement result according to the measurement level threshold.

With the third aspect to the second possible implementation of the third aspect, in a third possible implementation, the reference signal resource allocation message further includes a measurement process restart identifier; After the node that sends the reference signal in the measurement node group receives the measurement process restart identifier, the CSI measurement and feedback need not be performed in the measurement process until the measurement process restart identifier is received again; And the measuring process includes the CSI measurement multiple times, and the reference signal is sent by different nodes in the measurement node group in each of the CSI measurements.

In a fourth aspect, an embodiment of the present invention provides a method for measuring channel state information, including: receiving, by a second node in a measurement node group, a reference signal resource allocation message sent by a first node, where the reference signal resource allocation message is included An identifier of a node that transmits a reference signal, and resource indication information of a resource that is used to transmit a reference signal for performing channel state information CSI measurement; wherein the first node manages the measurement node group, Included in the measurement node group are a plurality of the second nodes;

If the second node in the measurement node group determines that the identity identifier is the same as the identity identifier of the user, the reference signal is sent on the resource indicated by the resource indication information, so that the The plurality of second nodes in the set of measurement nodes of the reference signal perform CSI measurement based on the reference signal, and feed back CSI measurement results to the first node. In a first possible implementation manner of the fourth aspect, the method further includes:

And if the second node in the measurement node group determines that the identity identifier is different from the identity identifier of the user, after receiving the reference signal, performing the

The CSI measures and feeds back the CSI measurement result to the first node.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the reference signal resource allocation message further includes a measurement level threshold;

Correspondingly, after receiving the reference signal, the second node in the measurement node group performs the CSI measurement based on the reference signal, and feeds back the CSI measurement result to the first node. , including:

After receiving the reference signal, the second node in the measurement node group performs the CSI measurement based on the reference signal, and determines whether the CSI measurement result is lower than the measurement level threshold;

If the CSI measurement result is lower than the measurement level threshold, the second node in the measurement node group feeds out the range indication information to the first node; or does not feed back the first node CSI measurement results;

If the CSI measurement result is not lower than the measurement level threshold, the second node in the measurement node group feeds back the CSI measurement result to the first node.

With reference to the second aspect to the second possible implementation manner of the fourth aspect, in a third possible implementation, the reference signal resource allocation message further includes a measurement process restart identifier; After the second node sends the reference signal and receives the measurement process restart identifier, the CSI measurement and feedback need not be performed in the measurement process until the measurement process restart identifier is received again; The measurement process includes the CSI measurement multiple times, and the reference signal is sent by different nodes in the measurement node group in each of the CSI measurements.

The method for measuring channel state information and the network node provided by the embodiment of the present invention, by setting a sending module and a receiving module, where the sending module is configured to send a reference signal resource allocation message to the measuring node group, where the network node manages the a measurement node group, the measurement node group includes a plurality of second nodes, and the reference signal resource allocation message includes an identity identifier of a node of the second node for transmitting a reference signal, and is sent for performing Resource indication information of a resource to be used when the CSI measures the reference signal; the receiving module is configured to receive the measurement a CSI measurement result sent by a plurality of the second nodes other than the node that sends the reference signal in the node group; the CSI measurement result is more than the node that sends the reference signal in the measurement node group The second node is fed back after receiving the reference signal and performing CSI measurement based on the reference signal. Thereby improving the measurement efficiency of CSI in the wireless backhaul network. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.

1 is a schematic structural diagram of Embodiment 1 of a network node according to the present invention;

2 is a schematic structural diagram of Embodiment 2 of a network node according to the present invention;

3 is a flowchart of Embodiment 1 of a method for measuring channel state information according to the present invention;

4 is a flowchart of Embodiment 2 of a method for measuring channel state information according to the present invention;

5 is a flowchart of Embodiment 3 of a method for measuring channel state information according to the present invention;

FIG. 6 is a schematic diagram of a second application scenario of a method for measuring channel state information according to the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In a typical application scenario of the embodiment of the present invention, as shown in the schematic diagram of the dense small station deployment scenario shown in FIG. 1, first, several types of nodes are defined: a node (Donor Node, D-Node for short), and a mesh network node. (Mesh Node, abbreviated as: M-Node), a Gateway Node (G-Node), and a functional combination node MG-Node of the M-Node and the G-Node. Specifically, the D-Node has a large coverage capability, and can implement wireless communication with the M-Node on at least one carrier, and the D-Node itself has a connection with the core network; the M-Node can also be at least with the adjacent M-Node. One Wireless communication is implemented on the carrier; the MG-Node can directly transmit back to the core network or other destination network in addition to the backhaul through the D-Node and the core network; the MG-Node can not only be at least one carrier with the D-Node. The wireless communication is implemented on the network, and the wireless communication can be implemented on the at least one carrier with the neighboring M-Node. In addition to performing backhaul with the core network through the D-Node, the backhaul can be directly performed with the core network or other destination networks.

It should be noted that, in the foregoing node definition, the M-Node and the G-Node are not limited to the base station node, and the user equipment (User Equipment, UE for short) type node that can provide access for other terminals, or has a certain UE nodes with backhaul capabilities are applicable.

FIG. 1 is a schematic structural diagram of Embodiment 1 of a network node according to the present invention. As shown in FIG. 1, the network node 10 provided in this embodiment may specifically include: a sending module 11 and a receiving module 12.

The sending module 11 may be configured to send a reference signal resource allocation message to the measurement node group, where the network node manages the measurement node group, the measurement node group includes multiple second nodes, and the reference signal resource The allocation message includes an identifier of a node of the second node for transmitting a reference signal, and resource indication information of a resource to be used when transmitting a reference signal for performing CSI measurement;

The receiving module 12 may be configured to receive CSI measurement results that are sent by the multiple second nodes except the node that sends the reference signal in the measurement node group; the CSI measurement result is in the measurement node group, except A plurality of the second nodes outside the node transmitting the reference signal are fed back after receiving the reference signal and performing CSI measurement based on the reference signal.

It should be noted that the resource indicated by the resource indication information may be a time-frequency resource, an antenna port, a reference signal type, and an orthogonal or non-orthogonal mask, which are required to be used when transmitting the reference signal; Broadcast channel, control channel, multicast channel to send. In the above, the resource indication information includes multiple types of information, and in some implementations, the multiple channels may be sent in multiple batches, for example, one part through the broadcast channel and the other part through the control channel. This embodiment does not limit this.

The sending module 11 may be specifically configured to monitor a service load status of the multiple second nodes in the measurement node group; and when the service load status of multiple second nodes in the measurement node group When less than the preset threshold, the reference signal resource allocation message is sent to a plurality of the second nodes in the measurement node group.

Optionally, the reference signal resource allocation message may further include a measurement level threshold; A plurality of the second nodes in the measurement node group determine whether to feed back the CSI measurement result according to the measurement level threshold.

Optionally, the reference signal resource allocation message may further include a measurement process restart identifier, where the measurement process restart identifier is used to indicate that the node that sends the reference signal in the measurement node group receives the measurement process restart identifier. The CSI measurement and feedback need not be performed in the measurement process until the measurement process restart identifier is received again; wherein the measurement process includes the CSI measurement multiple times, in each of the CSI measurements The different nodes in the measurement node group send the reference signal.

The network node of this embodiment is configured to send a reference signal resource allocation message to the measurement node group by setting a sending module and a receiving module, where the network node manages the measurement node group, and the measurement node group includes a plurality of second nodes, where the reference signal resource allocation message includes an identity of a node of the second node for transmitting a reference signal, and a resource used when transmitting a reference signal for performing CSI measurement And the receiving module is configured to receive, by the receiving module, a CSI measurement result that is fed back by the plurality of second nodes except the node that sends the reference signal; the CSI measurement result is the measurement node group And a plurality of the second nodes except the node that sends the reference signal are fed back after receiving the reference signal and performing CSI measurement based on the reference signal. Thereby improving the measurement efficiency of CSI in the wireless backhaul network.

FIG. 2 is a schematic structural diagram of Embodiment 2 of a network node according to the present invention. As shown in FIG. 2, the network node 20 provided in this embodiment may specifically include: a receiving module 21 and a sending module 22.

The receiving module 21 may be configured to receive a reference signal resource allocation message sent by the first node, where the reference signal resource allocation message includes an identity identifier of a node for transmitting the reference signal, and a reference signal for performing CSI measurement. The resource indication information of the resource to be used; wherein the first node manages the measurement node group, the measurement node group includes a plurality of second nodes; and the plurality of second nodes include the network node;

The sending module 22 may be configured to: if it is determined that the identity identifier is the same as its own identity, send the reference signal on the resource indicated by the resource indication information; to enable the reference signal to be received The plurality of second nodes in the measurement node group perform CSI measurement based on the reference signal, and feed back CSI measurement results to the first node.

The sending module 22 may be further configured to: if the identity identifier and the identity of the identity are determined If the reference signal is received, the CSI measurement is performed based on the reference signal, and the CSI measurement result is fed back to the first node.

Optionally, the reference signal resource allocation message further includes a measurement level threshold. Correspondingly, the sending module 22 is specifically configured to: after receiving the reference signal, perform the CSI measurement based on the reference signal, Determining whether the CSI measurement result is lower than the measurement level threshold; if the CSI measurement result is lower than the measurement level threshold, feeding out the out-of-range indication information to the first node; or not Returning, by the node, the CSI measurement result; if the CSI measurement result is not lower than the measurement level threshold, feeding back the CSI to the first node, where the reference signal resource allocation message may further include The measurement process restarts the identifier; the sending module 22 is specifically configured to: after the reference signal is sent, and the receiving module 21 receives the measurement process restart identifier, the CSI measurement is not required in the measurement process. Feedback, until the measurement process restart identifier is received again; wherein the measurement process includes the CSI measurement multiple times, each time CSI measurement by said measuring node group different nodes transmitting the reference signal.

The network node of this embodiment is configured to receive a reference signal resource allocation message sent by the first node by using a receiving module and a sending module, where the reference signal resource allocation message includes an identifier of a node for transmitting the reference signal. And the resource indication information of the resource to be used when the reference signal for the CSI measurement is sent; wherein the first node manages the measurement node group, and the measurement node group includes multiple second nodes; The second node includes the network node; the sending module may be configured to: if it is determined that the identity identifier is the same as its own identity, send the reference signal on the resource indicated by the resource indication information; The plurality of second nodes in the set of measurement nodes that receive the reference signal perform CSI measurement based on the reference signal, and feed back CSI measurement results to the first node. Thereby improving the measurement efficiency of CSI in the wireless backhaul network.

FIG. 3 is a flowchart of Embodiment 1 of a method for measuring channel state information according to the present invention. As shown in FIG. 3, the method for measuring channel state information provided in this embodiment may be specifically implemented by a D-Node. The method provided in this embodiment may specifically include:

S101. The first node sends a reference signal resource allocation message to the measurement node group, where the first node manages the measurement node group, and the measurement node group includes multiple second nodes. The reference signal resource allocation message includes an identifier of a node of the second node for transmitting a reference signal, and resource indication information of a resource to be used when transmitting a reference signal for performing CSI measurement.

Since the small nodes in the typical scenario applied in this embodiment are densely deployed, the number of the second nodes is large. When performing CSI measurement, multiple second nodes may be divided into one or more measurement groups for measurement. In this step, the first node may be a D-Node, and the second node may be an M-Node. The resource indicated by the resource indication information may be a time-frequency resource, an antenna port, a reference signal type, and a quadrature or non-orthogonal mask, which are used when the reference signal is sent; the resource indication information may be through a broadcast channel, Control channel, multicast channel to send. In view of the fact that the resource indication information includes multiple types of information, in the specific implementation, the foregoing multiple channels may also be sent in multiple batches, for example, one part passes through the broadcast channel and the other part passes through the control channel. This embodiment does not limit this.

S102. The first node receives CSI measurement results that are sent by the multiple second nodes except the node that sends the reference signal in the measurement node group. The CSI measurement result is in the measurement node group. A plurality of the second nodes other than the node transmitting the reference signal are fed back after receiving the reference signal and performing CSI measurement based on the reference signal.

In the technical solution of the embodiment, the first node sends a reference signal resource allocation message to the measurement node group, where the first node manages the measurement node group, and the measurement node group includes multiple second nodes. The reference signal resource allocation message includes an identifier of a node of the second node for transmitting a reference signal, and resource indication information of a resource to be used when transmitting a reference signal for performing CSI measurement; The first node receives CSI measurement results fed back by the plurality of second nodes in the measurement node group except the node that sends the reference signal; the CSI measurement result is in the measurement node group, except the sending A plurality of the second nodes outside the node of the reference signal are fed back after receiving the reference signal and performing CSI measurement based on the reference signal. The first node periodically controls the transmission of the reference signal, and the plurality of second nodes send reference signals to each other according to the reference signal resource allocation message of the first node, and feedback, thereby improving the measurement efficiency of the CSI measurement in the wireless backhaul network.

FIG. 4 is a flowchart of Embodiment 2 of a method for measuring channel state information according to the present invention. As shown in FIG. 4, based on the foregoing embodiment, in the method provided in this embodiment, the foregoing S101 may be specifically: S201, the first node monitors a service load state of the multiple second nodes in the measurement node group; when the service load status of the multiple second nodes in the measurement node group is less than a pre- When the threshold is set, the reference signal resource allocation message is sent to a plurality of the second nodes in the measurement node group.

In this step, considering that a plurality of second nodes may be fixedly erected, the channel response between the plurality of second nodes may remain unchanged for a long time, and therefore, in order to reduce CSI measurement as much as possible The impact of the overhead on the service transmission. In this embodiment, the first node can monitor the traffic load on multiple second nodes, for example, monitoring the resource utilization of a certain second node over a period of time. The CSI measurement is triggered when the resource usage is less than the preset threshold, and the reference signal resource allocation message is sent to the multiple second nodes when the first node detects that the resource utilization is less than the preset threshold. .

In the technical solution of the embodiment, the service load status of the plurality of the second nodes in the measurement node group is monitored by the first node; and the services of the multiple second nodes in the measurement node group are Sending the reference signal resource allocation message to a plurality of the second nodes in the measurement node group when the load state is less than a preset threshold; the first node receiving the reference signal group in the measurement node group The CSI measurement results fed back by the plurality of second nodes outside the node; thereby improving the measurement efficiency of the CSI measurement in the wireless backhaul network, and reducing the impact of the overhead caused by the CSI measurement on the service transmission.

Further, on the basis of the foregoing embodiment, in order to reduce feedback of unnecessary CSI measurement results, a measurement level threshold may be further included in the reference signal resource allocation message; so that multiple locations in the measurement node group The second node determines whether to feed back the CSI measurement result according to the measurement level threshold.

In the technical solution of the embodiment, when the reference signal resource allocation message includes a measurement level threshold, the second node does not go to the first when the CSI measurement result is less than the measurement level threshold. The node feeds back the CSI measurement result or feeds out the out-of-range indication information to the first node, thereby improving the measurement efficiency of the CSI measurement in the wireless backhaul network, and reducing the feedback of unnecessary CSI measurement results.

Further, on the basis of the foregoing embodiment, the reference signal resource allocation message may further include a measurement flow restart identifier, where the measurement flow restart identifier is used to indicate that the measurement node group sends the reference signal to receive the node. After the measurement process restarts the identification, in the measurement process The CSI measurement and feedback need not be performed until the measurement process restart identifier is received again; wherein the measurement process includes the CSI measurement multiple times, and the measurement node is used in each CSI measurement. Different nodes in the group send the reference signal.

The technical solution of this embodiment can improve the measurement efficiency of CSI in the wireless backhaul network.

FIG. 5 is a flowchart of Embodiment 3 of a method for measuring channel state information according to the present invention. As shown in FIG. 5, the method for measuring channel state information provided in this embodiment may be specifically performed by an M-Node, and the method provided in this embodiment may specifically include:

The second node in the measurement node group receives the reference signal resource allocation message sent by the first node, where the reference signal resource allocation message includes an identity identifier of a node for transmitting the reference signal, and is sent for performing CSI measurement. The resource indication information of the resource to be used when referring to the signal; wherein the first node manages the measurement node group, and the measurement node group includes a plurality of the second node.

Refer to the description of S101.

5302. If the second node in the measurement node group determines that the identity identifier is the same as the identity identifier of the user, the reference signal is sent on the resource indicated by the resource indication information, so that the reference signal is received. The plurality of second nodes in the measurement node group of the reference signal perform CSI measurement based on the reference signal, and feed back CSI measurement results to the first node.

S303, if the second node in the measurement node group determines that the identity identifier is different from the identity identifier of the user, after receiving the reference signal, performing the CSI measurement based on the reference signal, And feeding back the CSI measurement result to the first node.

In the technical solution of the embodiment, the reference node resource allocation message sent by the first node is received by the second node in the measurement node group, where the reference signal resource allocation message includes an identity identifier of the node for transmitting the reference signal, and sending Resource indication information of a resource used for performing a CSI measurement reference signal; if the second node in the measurement node group determines that the identity identifier is the same as its own identity identifier, then the resource is in the resource Sending the reference signal on the resource indicated by the indication information; if the second node in the measurement node group determines that the identity identifier is different from its own identity identifier, after receiving the reference signal, Performing the CSI measurement based on the reference signal and feeding back the CSI measurement result to the first node. Thereby improving the measurement efficiency of CSI measurement in the wireless backhaul network. The method for measuring channel state information provided by the embodiment of the present invention is described in detail in four application scenarios.

In a first application scenario, the first node sends a reference signal resource allocation indication message to multiple second nodes managed by the first node, for example, three second nodes, assuming that the second node (1) is sent to send a reference. The signal, the reference signal resource allocation indication message may include an identity identifier of the second node (1), and resource indication information of a resource to be used when transmitting the reference signal for performing CSI measurement.

The second node (1) transmits a reference signal to the second node (2) and the second node (3) on the resource indicated by the resource indication information, and the second node (2) and the second node (3) receive the reference signal Then, the CSI measurement is performed based on the reference signal, and the CSI measurement result is fed back to the first node.

In the second application scenario, since the number of the second nodes is large, the plurality of second nodes are divided into one or more measurement groups for measurement, and if four second nodes are included in one measurement group, the measurement group is To complete the measurement process, at least 3 measurements are required.

In this application scenario, the reference signal resource allocation message includes a measurement flow restart identifier, an identity of a node for transmitting a reference signal, and resource indication information of a resource to be used when transmitting a reference signal for performing CSI measurement. After the second node in the measurement node group sends the reference signal and receives the measurement process restart identifier, the CSI measurement and feedback are not required in the measurement process until the measurement process restart identifier is received again; wherein the measurement process includes The CSI measurement transmits a reference signal by a different node in the measurement node group in each CSI measurement.

Specifically, referring to FIG. 6, it is assumed that in a measurement process, the first node first specifies the second node in the upper left corner to transmit the reference signal, and then the second node in the upper right corner of the first node sends the reference signal, and then the upper left corner The two nodes have already sent the reference signal, and the reference signal resource allocation message sent by the first node includes the measurement flow restart identifier, so the second node in the upper left corner receives the reference signal sent by the second node in the upper right corner. , no CSI measurement and feedback is required.

It should be noted that the measurement process restart identifier can be set to 0 or 1. When the measurement process restart identifier is 0, it means that the measurement process does not need to be restarted, gp, and the second node in the measurement group receives the measurement process restart identifier is 0. When the reference signal resource allocation message is sent, it is considered that the measurement process does not end. If the second node has transmitted the reference signal, the CSI measurement is not required when receiving the reference signal sent by the other second node in the measurement group. Feedback; when measuring flow When the process restart flag is 1, it indicates that the measurement process needs to be restarted. gp. When the second node in the measurement group receives the reference signal resource allocation message containing the measurement process restart identifier of 1, it is considered to be a new measurement process. The second node within the CSI measurement is performed according to a normal procedure.

In a third application scenario, in order to reduce feedback of unnecessary CSI measurement results, the first node may include a measurement level threshold in the reference signal resource allocation message, and the second node performs the reference signal based on the reference signal after receiving the reference signal. CSI measurement, and determining whether the CSI measurement result is lower than the measurement level threshold; if the second node determines that the CSI measurement result is lower than the measurement level threshold, the second node feeds back the range indication information to the first node; or does not go to the first The node feeds back the CSI measurement result; if the second node determines that the CSI measurement result is not lower than the measurement level threshold, the second node feeds back the CSI measurement result to the first node.

In the fourth application scenario, considering that a plurality of second nodes may be fixedly erected, the channel response between the plurality of second nodes may remain unchanged for a long time, and therefore, in order to reduce as much as possible The impact of the overhead caused by the CSI measurement on the service transmission may be monitored by the first node on the traffic load status of the multiple second nodes, and the measurement process may be triggered when the service load is low. For example, the first node may monitor a certain The resource utilization of the second node in a period of time, when the resource utilization is less than the preset threshold, the csi measurement is triggered, gp, when the first node detects that the resource utilization is less than the preset threshold, The plurality of second nodes send the reference signal resource allocation message, so that the second node performs CSI measurement, and feeds back the CSI measurement result to the first node.

The technical solution of this embodiment can improve the measurement efficiency of CSI measurement in the wireless backhaul network.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, may be located in one place. Square, or it can be distributed to multiple network elements. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a hardware plus software functional unit.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Part of the steps. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. medium.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A network node, characterized by: including:

A sending module, configured to send a reference signal resource allocation message to a measurement node group, wherein the network node manages the measurement node group, the measurement node group includes a plurality of second nodes, and the reference signal resource allocation message Including the identity of the node used to send the reference signal among the plurality of second nodes, and resource indication information of the resources required to be used when sending the reference signal used for channel state information CSI measurement;

A receiving module, configured to receive CSI measurement results fed back by a plurality of second nodes in the measurement node group except the node that sends the reference signal; the CSI measurement result is the CSI measurement result of the second node in the measurement node group except the node that sends the reference signal. Multiple second nodes outside the node of the reference signal provide feedback after receiving the reference signal and performing CSI measurements based on the reference signal.

2. The network node according to claim 1, characterized in that: the sending module is specifically configured to monitor the service load status of a plurality of second nodes in the measuring node group; when the measuring node group When the service load status of the plurality of second nodes is less than a preset threshold, the reference signal resource allocation message is sent to the plurality of second nodes in the measurement node group.

3. The network node according to claim 1 or 2, characterized in that the reference signal resource allocation message further includes a measurement level threshold; so that a plurality of the second nodes in the measurement node group are configured according to The measurement level threshold determines whether to feed back the CSI measurement result.

4. The network node according to any one of claims 1 to 3, characterized in that, the reference signal resource allocation message also includes a measurement process restart identifier; the measurement process restart identifier is used to indicate that in the measurement node group After the node sending the reference signal receives the measurement process restart identifier, it does not need to perform the CSI measurement and feedback in the measurement process until it receives the measurement process restart identifier again; wherein, the measurement process includes The CSI is measured multiple times, and in each CSI measurement, different nodes in the measuring node group send the reference signal.

5. A network node, characterized by including:

A receiving module configured to receive a reference signal resource allocation message sent by the first node, where the reference signal resource allocation message includes the identity of the node used to send the reference signal, and to send a reference signal used for channel state information CSI measurement. Resource indication information of resources required for use; wherein, the first node manages a measurement node group, and the measurement node group includes multiple second nodes; the plurality of second nodes include the network node;

A sending module, configured to send the reference signal on the resource indicated by the resource indication information if it is determined that the identity identifier is the same as its own identity identifier; so that the measurement of the reference signal is received The plurality of second nodes in the node group perform CSI measurements based on the reference signal, and feed back the CSI measurement results to the first node.

6. The network node according to claim 5, wherein the sending module is further configured to: if it is determined that the identity identifier is different from its own identity identifier, after receiving the reference signal, based on the The reference signal is used to perform the CSI measurement, and the CSI measurement result is fed back to the first node.

7. The network node according to claim 5 or 6, characterized in that the reference signal resource allocation message also includes a measurement level threshold;

Correspondingly, the sending module is specifically configured to perform the CSI measurement based on the reference signal after receiving the reference signal, and determine whether the CSI measurement result is lower than the measurement level threshold;

If the CSI measurement result is lower than the measurement level threshold, feedback out-of-range indication information to the first node; or do not feed back the CSI measurement result to the first node;

If the CSI measurement result is not lower than the measurement level threshold, the CSI measurement result is fed back to the first node.

8. The network node according to any one of claims 5-7, characterized in that the reference signal resource allocation message also includes a measurement process restart identifier;

The sending module is specifically configured to, after sending the reference signal and the receiving module receiving the measurement process restart identifier, do not need to perform the CSI measurement and feedback in the measurement process until the CSI measurement is received again. Measurement process restart flag; wherein, the measurement process includes multiple times of

CSI measurement, in each CSI measurement, different nodes in the measurement node group send the reference signal.

9. A method for measuring channel state information, characterized by: including:

The first node sends a reference signal resource allocation message to the measurement node group, wherein the first node manages the measurement node group, the measurement node group includes a plurality of second nodes, and the reference signal resource allocation message includes The identity of the node used to send reference signals among the plurality of second nodes, and the identity of the node used to send reference signals for channel state information CSI measurement. Resource indication information for the resource used;

The first node receives CSI measurement results fed back by a plurality of second nodes in the measurement node group except the node that sends the reference signal; the CSI measurement result is the CSI measurement result of the second node in the measurement node group except the node that sends the reference signal. Multiple second nodes outside the node of the reference signal provide feedback after receiving the reference signal and performing CSI measurements based on the reference signal.

10. The method according to claim 9, characterized in that the first node sends a reference signal resource allocation message to the measurement node group, including:

The first node monitors the service load status of multiple second nodes in the measurement node group; when the business load status of multiple second nodes in the measurement node group is less than a preset threshold Within a time limit, the reference signal resource allocation message is sent to multiple second nodes in the measurement node group.

11. The method according to claim 9 or 10, characterized in that the reference signal resource allocation message further includes a measurement level threshold; so that a plurality of the second nodes in the measurement node group are configured according to the The measurement level threshold is used to determine whether to feed back the CSI measurement result.

12. The method according to any one of claims 9 to 11, characterized in that, the reference signal resource allocation message also includes a measurement process restart identifier; the measurement process restart identifier is used to indicate that the measurement node group sends After the node of the reference signal receives the measurement process restart identifier, it does not need to perform the CSI measurement and feedback in the measurement process until it receives the measurement process restart identifier again; wherein, the measurement process includes multiple The CSI measurement is performed several times, and in each CSI measurement, different nodes in the measuring node group send the reference signal.

13. A method for measuring channel state information, characterized by: including:

The second node in the measurement node group receives the reference signal resource allocation message sent by the first node. The reference signal resource allocation message includes the identity of the node used to send the reference signal and sends a channel state information CSI measurement. Resource indication information of resources required to be used when providing reference signals; wherein, the first node manages the measurement node group, and the measurement node group includes a plurality of second nodes;

If the second node in the measurement node group determines that the identity identifier is the same as its own identity identifier, then the reference signal is sent on the resource indicated by the resource indication information; so that the reference signal is received The plurality of second nodes in the measurement node group of the reference signal perform CSI measurements based on the reference signal, and feed back the CSI measurement results to the first node.

14. The method according to claim 13, further comprising: if the second node in the measurement node group determines that the identity identifier is different from its own identity identifier, after receiving the After describing the reference signal, perform the method based on the reference signal

CSI measurement, and feeding back the CSI measurement result to the first node.

15. The method according to claim 13 or 14, characterized in that the reference signal resource allocation message also includes a measurement level threshold;

Correspondingly, the second node in the measurement node group, after receiving the reference signal, performs the CSI measurement based on the reference signal, and feeds back the CSI measurement result to the first node , include:

After receiving the reference signal, the second node in the measurement node group performs the CSI measurement based on the reference signal and determines whether the CSI measurement result is lower than the measurement level threshold;

If the CSI measurement result is lower than the measurement level threshold, the second node in the measurement node group feeds back out-of-range indication information to the first node; or does not feed back the out-of-range indication information to the first node. Describe the CSI measurement results;

16. The method according to any one of claims 13 to 15, characterized in that the reference signal resource allocation message also includes a measurement process restart identifier;

After the second node in the measurement node group has sent the reference signal and received the measurement process restart identifier, it does not need to perform the CSI measurement and feedback in the measurement process until it receives the CSI measurement again. The measurement process restart flag; wherein, the measurement process includes multiple times of