KR20210034231A - Donor node and operation method thereof - Google Patents

Abstract

A donor node is disclosed. One embodiment determines link quality information of each of a plurality of paths to a first node which wants to configure a back haul, calculates a path selection metric of each of the plurality of paths by combining the determined link quality information and the hop count of each of the plurality of paths, and selects a path for the first node based on the calculated path selection metric of each of the plurality of paths.

Description

Donor node and its operation method {DONOR NODE AND OPERATION METHOD THEREOF}

The following embodiments relate to a donor node.

The mmWave frequency-based 5G can provide high throughput, but provides a narrow coverage due to frequency characteristics, and requires a large number of base stations to be installed compared to existing LTE and low-frequency bands. In such an environment, a method of selecting a suitable path and configuring (or reconfiguring) the topology is required.

As a related prior art, there is Korean Laid-Open Patent Publication No. 10-2019-0006066 (Title of Invention: Determination of a Route in a Communication Network, Applicant: Telehonakti Ebolaget L.M. Ericsson (PUBL)). The published patent publication discloses a method of calculating an end-to-end path across a plurality of domains in a communication network. The route calculation method disclosed in this patent publication includes receiving a request for a route across a plurality of domains and an end-to-end route over a plurality of domains as part of a hierarchical route calculation at a network control entity. And calculating.

A method of operating a donor node according to one side includes: determining link quality information of each of a plurality of paths to a first node for which a backhaul configuration is desired; Calculating a path selection metric for each of the plurality of paths by combining the determined link quality information and a hop count of each of the plurality of paths; And selecting a path for the first node based on the calculated path selection metric of each of the plurality of paths.

The determining of link quality information of each of the plurality of paths includes determining a first index corresponding to a first quality value of each of the backhaul links included in each of the plurality of paths by referring to a predefined table, Summing the determined first indices; Determining a second index corresponding to a second quality value of each of the backhaul links included in each of the plurality of paths by referring to the predefined table, and summing the determined second indexes; And determining link quality information of each of the plurality of paths based on a result of summing the determined first indices and a result of summing the determined second indices.

The first quality value may correspond to Reference Signal Received Power (RSRP), and the second quality value may correspond to Signal-to-Interference-plus-Noise Ratio (SINR).

The calculating of the path selection metric of each of the plurality of paths may include a ratio between a hop count and a maximum hop count of each of the plurality of paths, between the determined link quality information and maximum link quality information of each of the plurality of paths. It may include calculating a path selection metric of each of the plurality of paths using a ratio and a weight.

The calculating of the path selection metric of each of the plurality of paths may include applying a first weight to a first ratio between a hop count and a maximum hop count of each of the plurality of paths; Applying a second weight to a second ratio between the determined link quality information and maximum link quality information of each of the plurality of paths; And calculating a route selection metric for each of the plurality of routes using a result of applying the first weight to the first ratio and a result of applying the second weight to the second ratio.

The method of operating the donor node may further include reconfiguring a topology including the first node, the donor node, and nodes when at least one of a load event and a link quality event occurs.

Reconfiguring the topology may include checking whether there is a node whose load exceeds a first threshold value; And reconfiguring the topology when there is a node in which the load exceeds the first threshold value.

Reconfiguring the topology may include checking whether there is a node whose load exceeds a first threshold value; If there is no node whose load exceeds the first threshold value, checking whether there is a node whose backhaul link quality exceeds a second threshold value; And reconfiguring the topology when there is a node in which the backhaul link quality exceeds the second threshold.

The donor node may correspond to an Integrated Access and Backhaul (IAB) donor node.

The donor node according to one side determines link quality information of each of a plurality of paths to a first node for which a backhaul configuration is desired, and combines the determined link quality information and hop count of each of the plurality of paths to provide the plurality of paths. And a processor for calculating a path selection metric of each of the plurality of paths, and selecting a path for the first node based on the calculated path selection metric of each of the plurality of paths.

The processor determines a first index corresponding to a first quality value of each of the backhaul links included in each of the plurality of paths by referring to a predefined table, sums the determined first indices, and the predefined A result of determining a second index corresponding to a second quality value of each of the backhaul links included in each of the plurality of paths, adding the determined second indices, and summing the determined first indices And link quality information of each of the plurality of paths may be determined based on a result of summing the determined second indices.

The first quality value may correspond to Reference Signal Received Power (RSRP), and the second quality value may correspond to Signal-to-Interference-plus-Noise Ratio (SINR).

The processor uses a ratio between a hop count and a maximum hop count of each of the plurality of paths, a ratio between the determined link quality information and maximum link quality information of each of the plurality of paths, and a weight of the plurality of paths. Each route selection metric can be calculated.

The processor applies a first weight to a first ratio between a hop count and a maximum hop count of each of the plurality of paths, and a second ratio between the determined link quality information and maximum link quality information of each of the plurality of paths A second weight is applied to and a route selection metric of each of the plurality of routes may be calculated using a result of applying the first weight to the first ratio and a result of applying the second weight to the second ratio. .

When at least one of a load event and a link quality event occurs, the processor may reconstruct a topology including the first node, the donor node, and nodes.

The processor may check whether there is a node whose load exceeds the first threshold value, and when there is a node whose load exceeds the first threshold value, reconfigure the topology.

The processor checks whether there is a node whose load exceeds a first threshold value, and if there is no node whose load exceeds the first threshold value, checks whether there is a node whose backhaul link quality exceeds a second threshold value, and If there is a node whose backhaul link quality exceeds the second threshold, the topology may be reconstructed.

In embodiments, in an IAB network environment based on a 5G NR (New Radio) mmWave, an efficient path selection metric and a network topology reconfiguration according to an environment change may be performed. In other words, embodiments measure network quality and load, and when at least one of network quality and load exceeds a threshold value, a new path may be searched and selected, and a topology may be reconstructed. Accordingly, the backhaul construction cost can be reduced, a better network quality can be provided in a dense environment, and an IAB network can be efficiently formed.

1 to 2 are diagrams for explaining a wireless communication system according to an embodiment.
3 is a diagram for describing path selection according to an exemplary embodiment.
4 to 5 are diagrams for explaining topology reconfiguration according to an embodiment.
6 is a flowchart illustrating a method of operating a donor node according to an exemplary embodiment.
7 is a block diagram illustrating a donor node according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, or substitutes to the embodiments are included in the scope of the rights.

The terms used in the examples are used for illustrative purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Does not.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the embodiments, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the embodiments, the detailed description thereof will be omitted.

1 to 2 are diagrams for explaining a wireless communication system according to an embodiment.

Referring to FIG. 1, a wireless communication system 100 according to an embodiment includes a core 110, an Integrated Access and Backhaul (IAB) donor node 120, and a plurality of IAB nodes 130-1 to 130. -3), and user terminals 140-1 to 140-4. The wireless communication system 100 may be represented differently as an IAB network.

The core 110 may correspond to a 5G core.

The IAB donor node 120 may be composed of two protocol stacks: a central unit (CU) and a distributed unit (DU).

Each of the plurality of IAB nodes 130-1 to 130-3 may be configured with two protocol stacks of MT (Mobile Termination) and DU.

Each DU of the nodes 120 and 130-1 to 130-3 is connected to each of the user terminals 140-1 to 140-4 through a Uu interface.

The IAB donor node 120 may be connected to the core 110 through an NG interface, and may be connected to the lower IAB node 130-1 through a wireless backhaul.

The IAB node 130-1 may be connected to each of the lower IAB nodes 130-2 and 130-3 through a wireless backhaul. The IAB node 130-1 may receive a signal from the user terminal 140-2 and transmit it to the upper node, the IAB donor node 120.

In one embodiment, in the wireless communication system 100, path discovery is performed (210), and path selection based on hop count and link quality may be performed (220), and topology reconfiguration based on load and link quality is performed. Can be (230).

In step 210, the IAB node C 210 wishing to configure the backhaul may search for a path through an RRC connection request message and select an upper node for accessing the network. The IAB node C 210 may select the IAB node S 220 which is a serving node. The RRC connection request message of the IAB node C 210 may be delivered to the IAB donor node.

In step 220, the IAB donor node 120 can select an optimal path for the IAB node C 210 that wants to configure the wireless backhaul through the path selection metric, and information on the selected path is sent to the IAB node C 210. It is possible to set the path to the IAB node C (210) by transmitting to. The path selection metric and path selection will be described later with reference to FIG. 3.

In step 230, the IAB donor node 120 recognizes the entire IAB topology, finds and applies an optimal topology configuration, and reconfigures the topology in consideration of a changing network environment. The topology reconstruction will be described later with reference to FIGS. 4 and 5.

3 is a diagram for describing path selection according to an exemplary embodiment.

Referring to FIG. 3, link 1 is established between IAB donor node 120 and IAB node 1 130-1, and link 2 is established between IAB node 1 130-1 and IAB node 2 130-2. Is established, link 3 is established between IAB node 2 (130-3) and IAB node 3 (130-3), and link 4 is established between IAB node 1 (130-1) and IAB node 3 (130-3) Is set. Each of link 1 to link 4 represents a wireless backhaul.

Each of the IAB nodes 130-1 to 130-3 periodically transmits link quality values and load information (eg, load traffic) to an upper node. Accordingly, the IAB donor node 120 may periodically collect or acquire link quality values and load information for each of links 1 to 4.

Link quality values may include, for example, Reference Signal Received Power (RSRP) and Signal-to-Interference-plus-Noise Ratio (SINR), but are not limited thereto.

Assuming that IAB node 4 210 wants a wireless backhaul configuration, IAB donor node 120 may identify a plurality of paths to IAB node 4 210. The IAB donor node 120 includes a first path including link 1, link 2, and link 3 and links 1 and link 4, since the serving IAB node of the IAB node 4 210 is the IAB node 3 130-3. It is possible to identify the second path to be taken.

<Determine link quality information>

The IAB donor node 120 may determine link quality information of each of the first path and the second path. In the example shown in FIG. 3, the IAB donor node 120 may determine an index corresponding to each RSRP of link 1, link 2, and link 3 included in the first path by referring to a predefined table, and in advance An index corresponding to each SINR of link 1, link 2, and link 3 included in the first path may be determined by referring to the defined table. In addition, the IAB donor node 120 may determine an index corresponding to each RSRP of link 1 and link 4 included in the second path by referring to the predefined table, and refer to the predefined table to determine the index corresponding to the second path. An index corresponding to the SINR of each of the included link 1 and link 4 may be determined. Table 1 below shows an example of a predefined table.

index RSRP SINR One -85 or more 20 or more 2 -94 ≤ RSRP <-85 6 ≤ SINR <20 3 -104 ≤ RSRP <-94 0 ≤ SINR <6 4 -114 ≤ RSRP <-104 Less than 0 5 Less than -114 No Service

Assume that the RSRP and SINR of each link in the example shown in FIG. 3 correspond to Table 2 below.

RSRP SINR link 1 -85 20 link 2 -89 18 link 3 -100 5 link 4 -85 10

When referring to Table 1 above, the indexes corresponding to RSRPs of link 1 to link 4 are 1, 2, 3, and 1, and the indexes corresponding to SINRs of link 1 to link 4 are 1, 2, 3, And 2.

The IAB donor node 120 may add the indexes corresponding to RSRPs of link 1, link 2, and link 3 included in the first path, and link 1, link 2, and link 3 included in the first path, respectively. The index corresponding to the SINR of may be summed, and link quality information for the first path including link 1, link 2, and link 3 may be determined based on the summation result. For example, the sum of the indexes corresponding to the RSRPs of link 1, link 2, and link 3 is 6, and the sum of the indexes corresponding to the SINRs of link 1, link 2, and link 3 is 6. The IAB donor node 120 includes a first result (i.e., 6) of the sum of the indexes corresponding to RSRPs of link 1, link 2, and link 3 included in the first path, and link 1 and link included in the first path. Link quality information for the first path may be determined by adding a second result (ie, 6) of the sum of the indexes corresponding to the SINRs of 2 and link 3, respectively. That is, the IAB donor node 120 may determine 12 as the link quality information for the first path. Likewise, the IAB donor node 120 may determine link quality information for the second path including link 1 and link 4 as 5.

<Route selection metric calculation and route selection>

The IAB donor node 120 may calculate a path selection metric for each of the first and second paths based on the link quality information and the hop count of each of the first and second paths. For example, the IAB donor node 120 may calculate a path selection metric for each of the first and second paths according to Equation 1 below.

In Equation 1 above, M represents the path selection metric, α represents the weight, H represents the hop count of the path, and H_max represents the maximum hop count. H_max is a predetermined value and may correspond to, for example, 6, but is not limited thereto. In Equation 1 above, Q denotes link quality information, and Q_max denotes maximum link quality information of a path. Q_max may be determined based on the hop count of the path and the maximum index 5 in Table 1 above. Since the hop count of the first path is 3, Q_max of the first path may be determined as 15, and since the hop count of the second path is 2, Q_max of the second path may be determined as 10.

The IAB donor node 120 may calculate the path selection metric M ₁ =α(3/H_max) + (1-α)(12/15) of the first path according to Equation 1 above, and the path of the second path The selection metric M ₂ =α(2/H_max) + (1-α)(5/10) can be calculated.

The IAB donor node 120 may _{select a path corresponding to the minimum of M 1} and M ₂ as the path of the IAB node 4 210. As an example, if M ₂ is minimum among the M ₁ and M _2, IAB donor node 120 link 1, link 4, and link 5 (here, link 5 is IAB node 4 (210) and node 3 IAB (130- 3) Indicating the wireless backhaul between) can be determined as a path to the IAB node 4 (210).

In Equation 1 above, the weight α may be adaptively changed according to the network environment. If there is no change in the overall network environment, the IAB donor node 120 can select the path with the least hop by increasing the weight α, and in the environment where the link change is large, the IAB donor node 120 lowers the weight α. You can choose a path with good link quality. Accordingly, the IAB donor node 120 is efficient and can determine the optimal path of the IAB node for which the wireless backhaul configuration is desired according to the network environment.

In the existing wireless communication, a wired connection based on a single hop may exhibit the best performance than a multi-hop configuration based on a wireless backhaul. Therefore, the nearest node connected by wire can exhibit good performance. However, in the mmWave environment in which IAB is configured, the change in link state is large, so a simple hop-by-hop or end-to-end flow control mechanism may cause performance degradation due to congestion and quality problems of intermediate nodes. I can. A selection metric based on link quality (eg, SINR, etc.) may select a path that provides good quality, but may run too many hops. In the multi-hop base, the more hops, the lower the overall quality. Therefore, it is difficult for the existing path selection metric to adaptively cope with rapidly changing network environments. The path selection metric according to an embodiment considers both the hop count and the link quality, so that it is possible to adaptively cope with a rapidly changing network environment and to efficiently determine an optimal path.

4 to 5 are diagrams for explaining topology reconfiguration according to an embodiment.

Referring to FIG. 4, the IAB donor node 210 checks whether the load of each of the IAB nodes 130-1 to 130-3 and 210 exceeds a threshold value (410 ). In other words, the IAB donor node 210 checks whether there is an IAB node whose load exceeds a threshold value.

The load may correspond to, for example, a traffic load.

The IAB donor node 210 reconstructs the topology when the load of at least one of the IAB nodes 130-1 to 130-3 and 210 exceeds the threshold value (430 ). As an example, the IAB donor node 210 may allow a path reselection message to be transmitted to the IAB nodes 130-1 to 130-3 and 210, and re-route except for nodes whose load exceeds a threshold value. You choose, you can reconfigure the topology.

IAB donor node 210, if the load of each of the IAB nodes (130-1 to 130-3 and 210) does not exceed the threshold, IAB nodes (130-1 to 130-3 and 210) each of the wireless back It is checked whether the link quality of the hole exceeds the threshold value (420). In other words, the IAB donor node 210 may check whether there is an IAB node in which the link quality of the wireless backhaul exceeds a threshold value. The link quality of the wireless backhaul may be, for example, the sum of the index corresponding to the RSRP of the wireless backhaul and the index corresponding to the SINR of the wireless backhaul, but this is only an example, and the link quality of the wireless backhaul is the RSRP of the wireless backhaul. Or it may correspond to SINR. The IAB donor node 210 reconstructs the topology when the link quality of at least one of the IAB nodes 130-1 to 130-3 and 210 exceeds the threshold value (430 ).

An example of topology reconstruction is shown in FIG. 5.

In the example shown in FIG. 5, paths of IAB node 2 130-2 correspond to link 1 and link 2, and paths of IAB node 3 130-3 correspond to link 1 and link 4, and IAB node 4 Assume that the path of (210) corresponds to link 1, link 4, and link 5.

In the example shown in FIG. 5, the link quality of link 4 may exceed a threshold value. For example, the difference between the current link quality of link 4 and the previous link quality may be 1 or more on the index. In other words, a result of subtracting the sum of the index corresponding to the previous RSRP of link 4 and the index corresponding to the previous SINR from the sum of the index corresponding to the current RSRP of link 4 and the index corresponding to the current SINR may be 1 or more. This means that the quality of link 4 has deteriorated. link 4 is included in the path of the IAB node 3 (130-3) and the path of the IAB node 4 (210), the IAB donor node 120 is the path of the IAB node 3 (130-3) and the IAB node 4 (210) ), the topology can be reconstructed by reselecting each of the paths.

Although not illustrated in FIG. 5, in the example illustrated in FIG. 5, the traffic load of the IAB node 3 130-3 may exceed a threshold value. In this case, the IAB donor node 120 may reconfigure the topology by excluding the IAB node 3 130-3.

Since the IAB nodes 130-1 to 130-3 and 210 simultaneously support backhaul and access, a load may affect quality. Accordingly, the IAB donor node 120 may perform topology reconfiguration when the load of at least one of the IAB nodes 130-1 to 130-3 and 210 is high or quality is low.

6 is a flowchart illustrating a method of operating a donor node according to an exemplary embodiment.

The donor node to be described with reference to FIG. 6 corresponds to the IAB donor node 210.

Referring to FIG. 6, the donor node determines link quality information of each of a plurality of paths to a first node for which a backhaul configuration is desired (operation 610). Here, the first node may correspond to the IAB node 4 210 described with reference to FIGS. 2 and 3.

According to an embodiment, in step 610, the donor node refers to a first index corresponding to a first quality value (eg, RSRP) of each of the backhaul links included in each of the plurality of paths by referring to a predefined table. May be determined, and the determined first indices may be summed. In addition, the donor node determines a second index corresponding to a second quality value (eg, SINR) of each of the backhaul links included in each of the plurality of paths by referring to a predefined table, and the determined second index Indices can be summed. The donor node may determine link quality information of each of the plurality of paths based on a result of summing the determined first indices and a result of summing the determined second indices. Since this has been described with reference to FIG. 3, detailed descriptions are omitted.

The donor node calculates a path selection metric of each of the plurality of paths by combining the determined link quality information and the hop count of each of the plurality of paths (620).

According to an embodiment, in step 620, the donor node determines the ratio between the hop count and the maximum hop count of each of the plurality of paths, the ratio between the determined link quality information and the maximum link quality information of each of the plurality of paths, and A path selection metric for each of a plurality of paths may be calculated using the weight. As an example, the donor node may apply a first weight (eg, α) to a first ratio between the hop count and the maximum hop count of each of the plurality of paths, and determined link quality information of each of the plurality of paths. And a second weight (eg, 1-α) may be applied to the second ratio between the maximum link quality information. The donor node may calculate a path selection metric for each of the plurality of paths using the result of applying the first weight to the first ratio and the result of applying the second weight to the second ratio. Since this has been described with reference to FIG. 3, detailed descriptions are omitted.

The donor node selects a path for the first node based on the calculated path selection metric of each of the plurality of paths (630).

According to an embodiment, when at least one of a load event and a link quality event occurs, the donor node may reconstruct a topology including the donor node, the above-described first load, and nodes. Here, the load event indicates that the load exceeds the first threshold, and the link quality event is the backhaul link quality (for example, the sum of the index corresponding to the RSRP of the wireless backhaul and the index corresponding to the SINR of the wireless backhaul) It indicates that the second threshold has been exceeded. For example, the donor node may check whether there is a node whose load exceeds the first threshold value. In this case, if there is a node whose load exceeds the first threshold value, the donor node may reconstruct the topology. If there is no node whose load exceeds the first threshold value, the donor node may check whether there is a node whose backhaul link quality exceeds the second threshold value. In this case, when there is a node whose backhaul link quality exceeds the second threshold, the donor node may reconstruct the topology. Since the topology reconstruction has been described with reference to FIGS. 4 and 5, detailed descriptions are omitted.

7 is a block diagram illustrating a donor node according to an embodiment.

Referring to FIG. 7, the donor node 700 includes a processor 710 and a communication interface 720.

The donor node 700 corresponds to the IAB donor node 210.

The processor 710 determines link quality information of each of a plurality of paths to a first node for which a backhaul configuration is desired.

The processor 710 calculates a path selection metric of each of the plurality of paths by combining the determined link quality information and the hop count of each of the plurality of paths.

The processor 710 selects a path for the first node based on the calculated path selection metric of each of the plurality of paths.

The communication interface 720 may form a wireless backhaul with a lower node.

The details described through FIGS. 1 to 6 may be applied to the items described through FIG. 7, and thus detailed descriptions thereof will be omitted.

In a wireless backhaul solution, it may be important to select a path for a multi-hop section between an IAB node and an IAB donor node and reconfigure according to a change in network topology. According to an embodiment, in a multi-hop environment between a terminating IAB node and an IAB donor node, a metric for efficient path selection may be calculated. In this metric, each of RSRP and SINR is classified as an index, and a path can be adaptively selected by adjusting the weight of the hop count and link quality information in consideration of the network quality environment.

According to an embodiment, the topology may be reconfigured according to changes in the network environment. Topology reconfiguration may be performed when a specific threshold value is exceeded by giving a threshold value for the backhaul link quality and load of the IAB node. Through this threshold, unnecessary network load can be reduced in response to frequent topology changes.

The apparatus described above may be implemented as a hardware component, a software component, and/or a combination of a hardware component and a software component. For example, the devices and components described in the embodiments are, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA). , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions, such as one or more general purpose computers or special purpose computers. The processing device may execute an operating system (OS) and one or more software applications executed on the operating system. Further, the processing device may access, store, manipulate, process, and generate data in response to the execution of software. For the convenience of understanding, although it is sometimes described that one processing device is used, one of ordinary skill in the art, the processing device is a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of these, configuring the processing unit to behave as desired or processed independently or collectively. You can command the device. Software and/or data may be interpreted by a processing device or, to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodyed in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the embodiment, and vice versa.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims also fall within the scope of the following claims.

Claims (18)

In the method of operating a donor node,
Determining link quality information of each of a plurality of paths to a first node for which a backhaul configuration is desired;
Calculating a path selection metric of each of the plurality of paths by combining the determined link quality information and a hop count of each of the plurality of paths; And
Selecting a path for the first node based on the calculated path selection metric of each of the plurality of paths
Containing,
How the donor node works.
The method of claim 1,
Determining link quality information of each of the plurality of paths,
Determining a first index corresponding to a first quality value of each of the backhaul links included in each of the plurality of paths by referring to a predefined table, and summing the determined first indexes;
Determining a second index corresponding to a second quality value of each of the backhaul links included in each of the plurality of paths by referring to the predefined table, and summing the determined second indexes; And
Determining link quality information of each of the plurality of paths based on a result of summing the determined first indices and a result of summing the determined second indices
Containing,
How the donor node works.
The method of claim 2,
The first quality value corresponds to Reference Signal Received Power (RSRP), and the second quality value corresponds to Signal-to-Interference-plus-Noise Ratio (SINR),
How the donor node works.
The method of claim 1,
The step of calculating a path selection metric of each of the plurality of paths,
The path of each of the plurality of paths using a ratio between the hop count and the maximum hop count of each of the plurality of paths, the ratio between the determined link quality information and the maximum link quality information of each of the plurality of paths, and a weight Steps to calculate the selection metric
Containing,
How the donor node works.
The method of claim 1,
The step of calculating a path selection metric of each of the plurality of paths,
Applying a first weight to a first ratio between a hop count and a maximum hop count of each of the plurality of paths;
Applying a second weight to a second ratio between the determined link quality information and maximum link quality information of each of the plurality of paths; And
Calculating a route selection metric for each of the plurality of routes using a result of applying the first weight to the first ratio and a result of applying the second weight to the second ratio
Containing,
How the donor node works.
The method of claim 1,
When at least one of a load event and a link quality event occurs, reconfiguring a topology including the first node, the donor node, and nodes
Further comprising,
How the donor node works.
The method of claim 6,
Reconfiguring the topology,
Checking whether there is a node whose load exceeds a first threshold value; And
Reconfiguring the topology when there is a node in which the load exceeds the first threshold value
Containing,
How the donor node works.
The method of claim 6,
Reconfiguring the topology,
Checking whether there is a node whose load exceeds a first threshold value;
If there is no node whose load exceeds the first threshold value, checking whether there is a node whose backhaul link quality exceeds a second threshold value; And
Reconfiguring the topology when there is a node in which the backhaul link quality exceeds the second threshold
Containing,
How the donor node works.
The method of claim 1,
The donor node corresponds to an Integrated Access and Backhaul (IAB) donor node,
How the donor node works.
In the donor node,
Link quality information of each of a plurality of paths for a first node for which a backhaul configuration is desired is determined, and a path selection metric of each of the plurality of paths is determined by combining the determined link quality information and hop count of each of the plurality of paths. A processor that calculates and selects a path for the first node based on the calculated path selection metric of each of the plurality of paths
Containing,
Donor node.
The method of claim 10,
The processor,
A first index corresponding to a first quality value of each of the backhaul links included in each of the plurality of paths is determined by referring to a predefined table, and the determined first indices are summed,
A second index corresponding to a second quality value of each of the backhaul links included in each of the plurality of paths is determined by referring to the predefined table, and the determined second indexes are summed,
Determining link quality information of each of the plurality of paths based on a result of summing the determined first indices and a result of summing the determined second indices,
Donor node.
The method of claim 11,
The first quality value corresponds to Reference Signal Received Power (RSRP), and the second quality value corresponds to Signal-to-Interference-plus-Noise Ratio (SINR),
Donor node.
The method of claim 10,
The processor,
The path of each of the plurality of paths using a ratio between the hop count and the maximum hop count of each of the plurality of paths, the ratio between the determined link quality information and the maximum link quality information of each of the plurality of paths, and a weight To calculate the selection metric,
Donor node.
The method of claim 10,
The processor,
Applying a first weight to a first ratio between the hop count and the maximum hop count of each of the plurality of paths,
A second weight is applied to a second ratio between the determined link quality information and the maximum link quality information of each of the plurality of paths,
Calculating a path selection metric for each of the plurality of paths using a result of applying the first weight to the first ratio and a result of applying the second weight to the second ratio,
Donor node.
The method of claim 10,
The processor,
When at least one of a load event and a link quality event occurs, reconfiguring a topology including the first node, the donor node, and nodes,
Donor node.
The method of claim 15,
The processor,
Checking whether there is a node in which the load exceeds a first threshold value, and when there is a node in which the load exceeds the first threshold value, reconfiguring the topology,
Donor node.
The method of claim 15,
The processor,
Check whether there is a node whose load exceeds the first threshold value, and if there is no node whose load exceeds the first threshold value, check whether there is a node whose backhaul link quality exceeds the second threshold value, and the backhaul If there is a node whose link quality exceeds the second threshold, reconfiguring the topology,
Donor node.
The method of claim 10,
The donor node corresponds to an Integrated Access and Backhaul (IAB) donor node,
Donor node.

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