CN113905421A

CN113905421A - Cell selection method and equipment

Info

Publication number: CN113905421A
Application number: CN202010573453.9A
Authority: CN
Inventors: 王达; 曾二林; 孙建成
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2022-01-07
Anticipated expiration: 2040-06-22
Also published as: WO2021258783A1; CN113905421B

Abstract

The invention discloses a cell selection method and equipment, which are used for solving the problems that when an IAB (inter-integrated access node) selects or reselects a cell, a return link of the IAB forms a loop, and nodes in the loop cannot normally work in the prior art. The method comprises the following steps: and in the process of cell selection or cell reselection, the first node selects the second node according to the node information for determining the descendant node of the first node in the IAB network, and the first node is accessed to the second node. The second node accessed by the first node is selected according to the node information used for determining the descendant node of the first node in the IAB network, so that the first node can be prevented from being accessed to the descendant node of the first node, the return link forms a loop, and the robustness of data transmission of the IAB node can be improved.

Description

Cell selection method and equipment

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for cell selection.

Background

The IAB (Integrated Access and Backhaul) network technology achieves the purpose of expanding the coverage area of the base station by relaying wireless signals among a plurality of nodes. IAB networking is a networking model for the fifth future Generation (5th Generation, 5G) to address the coverage problem of base stations.

In the IAB network, on one hand, when an RLF (radio link failure) occurs between the IAB node and its parent node, the IAB node notifies its child node, so that the child node reselects another base station or the IAB node for access, that is, performs cell reselection, thereby recovering the access and backhaul links of the child node; on the other hand, when the IAB node does not access to other nodes, the IAB node needs to access to other nodes, i.e. perform cell selection, in order to form the backhaul link.

During the cell selection or cell reselection process of the IAB node, a backhaul link of the IAB node may form a loop and may not work normally.

Disclosure of Invention

The invention provides a cell selection method and equipment, which are used for solving the problems that when an IAB (inter-integrated access node) selects or reselects a cell, a return link of the IAB forms a loop, and nodes in the loop cannot normally work in the prior art.

Based on the foregoing problem, in a first aspect, an embodiment of the present invention provides a method for cell selection, where the method includes:

the method comprises the steps that a first node selects a second node from an IAB network according to node information used for determining descendant nodes of the first node in the IAB network in the process of cell selection or cell reselection;

the first node accesses the second node.

Optionally, the node information includes ID (Identifier) information and/or hop count information, where the hop count information is hop count information from the descendant node to a host node or a central control node in the IAB network;

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

BAP address information of the descendant node.

Optionally, before the first node selects the second node from the IAB network, the method further includes:

determining the ID information by at least one of:

the first node receives ID information configured by a host node IAB donor operation, maintenance and administration (OAM) equipment in the IAB network;

the first node acquires the ID information from the received broadcast information of the nodes in the IAB network;

the first node receives ID information reported by descendant nodes of the first node;

determining the hop count information by at least one of:

the first node receives hop count information configured by an IAB donor OAM device in the IAB network;

the first node receives hop count information of a parent node of the first node;

and the first node acquires the hop count information from the received broadcast information of the nodes in the IAB network.

Optionally, if a descendant node of the first node in the IAB network changes, the ID information configured by the IAB donor the OAM device in the IAB network received by the first node includes information of the changed descendant node or information of all descendant nodes of the first node.

Optionally, the method further includes:

the first node reports the ID information of the first node to a parent node of the first node; and/or

The first node transmits broadcast information of the first node.

Optionally, if a descendant node of the first node in the IAB network changes, the ID information reported to the parent node by the first node includes information of the changed descendant node or information of all descendant nodes of the first node.

Optionally, the broadcast information includes the hop count information;

before the first node sends the broadcast information of the first node, the method further includes:

and the first node determines the hop count information of the first node according to the hop count information of the parent node.

Optionally, the selecting, by the first node, a second node from the IAB network includes:

the first node determines a candidate node set in the IAB network according to the node information of the descendant nodes;

the first node selects a second node from the set of candidate nodes.

Optionally, the determining, by the first node, the candidate node set in the IAB network according to the node information of the descendant node, includes:

the first node determines a candidate node set formed by nodes except the descendant node in the IAB network according to the node information of the descendant node; or

And the first node determines nodes which are except the descendant nodes and meet the power requirement in the IAB network according to the node information of the descendant nodes, and a candidate node set formed by the determined nodes.

Optionally, the determining, by the first node, the candidate node set in the IAB network according to the node information of the descendant node, further includes:

and if no node meeting the power requirement is in the nodes except the descendant nodes in the IAB network, sending an RLF (radio link failure) notification to the descendant nodes of the first node, and selecting the nodes meeting the power requirement from the descendant nodes of the first node to form a candidate node set.

Optionally, the node meeting the power requirement is determined by the following method:

judging whether a node with the receiving power larger than a first power threshold value exists;

if so, taking the node with the received power larger than the first power threshold value as the node meeting the power requirement;

and if no node with the received power larger than the first power threshold value is taken as a node meeting the power requirement, reducing the first power threshold value, and returning to the step of judging whether a node with the received power larger than the first power threshold value exists or not until the reduced first power threshold value is smaller than the set minimum power threshold value.

Optionally, before the first node selects the second node from the IAB network according to the node information in the IAB network, the method further includes:

and after receiving the RLF notification sent by the parent node of the first node, the first node determines that cell reselection is needed.

Optionally, the node information includes the hop count information;

the first node determines a candidate node set in the IAB network according to the node information of the first node, including:

the first node selects nodes with hop count information less than or equal to that of the first node from the IAB network to form a candidate node set; or

And the first node determines nodes which correspond to the hop count information of the first node and are less than or equal to the hop count information of the first node and meet the power requirement from the IAB network, and the determined nodes form a candidate node set.

Optionally, the determining, by the first node, a candidate node set in the IAB network according to the node information of the first node, further includes:

if no node meeting the power requirement exists in the nodes of which the corresponding hop count information is less than or equal to the hop count information of the first node in the IAB network, sending an RLF (radio link failure) notification to the child nodes of the first node, and selecting the nodes meeting the power requirement from the child nodes of the first node to form a candidate node set.

judging whether a node with the receiving power larger than a second power threshold exists;

if so, taking the node with the received power larger than the second power threshold value as the node meeting the power requirement;

and if no node with the received power larger than the second power threshold value is taken as a node meeting the power requirement, reducing the second power threshold value, and returning to the step of judging whether a node with the received power larger than the second power threshold value exists or not until the reduced second power threshold value is smaller than the set minimum power threshold value.

Optionally, the selecting, by the first node, a second node from the candidate node set includes:

and the first node selects the node with the minimum hop count information and/or the maximum received power from the candidate node set as a second node.

Optionally, before the first node selects a second node from the IAB network according to the node information of the first node in the IAB network, the method further includes:

and after determining that the hop count information of the parent node is greater than the hop count information of the first node, the first node determines that cell reselection is required.

In a second aspect, an embodiment of the present invention provides an apparatus for cell selection, where the apparatus includes: a processor, a memory, and a transceiver;

wherein the processor is configured to read the program in the memory and execute:

in the process of cell selection or cell reselection, selecting a second node from the IAB network according to node information for determining a descendant node of a first node in the IAB network;

and accessing the second node.

Optionally, the node information includes ID information and/or hop count information, where the hop count information is hop count information from the descendant node to a host node or a central control node in the IAB network;

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

BAP address information of the descendant node.

Optionally, the processor is further configured to:

prior to selecting a second node from the IAB network, determining the ID information by at least one of:

receiving ID information configured by an IAB donor OAM device in the IAB network;

acquiring the ID information from the received broadcast information of the node in the IAB network;

receiving ID information reported by a descendant node of the first node;

determining the hop count information by at least one of:

receiving hop count information configured by an IAB donor OAM device in the IAB network;

receiving hop count information of a parent node of the first node;

and acquiring the hop count information from the received broadcast information of the node in the IAB network.

Optionally, the processor is further configured to:

reporting the ID information of the first node to a parent node of the first node; and/or

And sending the broadcast information of the first node.

Optionally, the broadcast information includes the hop count information; the processor is further configured to:

before the broadcast information of the first node is sent, the hop count information of the first node is determined according to the hop count information of the parent node.

Optionally, the processor is specifically configured to:

determining a candidate node set in the IAB network according to the node information of the descendant nodes;

a second node is selected from the set of candidate nodes.

Optionally, the processor is specifically configured to:

determining a candidate node set formed by nodes except the descendant nodes in the IAB network according to the node information of the descendant nodes; or

And determining nodes which are except the descendant nodes and meet the power requirement in the IAB network according to the node information of the descendant nodes, and a candidate node set formed by the determined nodes.

Optionally, the processor is further configured to:

when determining the candidate node set in the IAB network according to the node information of the descendant nodes, if no node meeting the power requirement exists in the nodes except the descendant nodes in the IAB network, sending an RLF (radio link failure) notification to the descendant nodes of the first node, and selecting the nodes meeting the power requirement from the descendant nodes of the first node to form the candidate node set.

Optionally, the processor determines the node meeting the power requirement by:

Optionally, the processor is further configured to:

and determining that cell reselection is needed after receiving an RLF (radio link failure) notification sent by a parent node of the first node before selecting a second node from the IAB network according to the node information in the IAB network.

Optionally, the node information includes the hop count information; the processor is specifically configured to:

selecting nodes with hop count information less than or equal to that of the first node from the IAB network to form a candidate node set; or

And determining nodes which correspond to the hop count information of the first node and meet the power requirement from the IAB network, and forming a candidate node set by the determined nodes.

Optionally, the processor is further configured to:

and determining a candidate node set in the IAB network according to the node information of the first node, if no node meeting the power requirement exists in the nodes of which the corresponding hop count information is less than or equal to the hop count information of the first node in the IAB network, sending an RLF (radio link failure) notification to the child nodes of the first node, and selecting the nodes meeting the power requirement from the child nodes of the first node to form the candidate node set.

Optionally, the processor determines the node meeting the power requirement by:

Optionally, the processor is specifically configured to:

and selecting the node with the minimum hop count information and/or the maximum received power from the candidate node set as a second node.

Optionally, the processor is further configured to:

before selecting a second node from the IAB network according to the node information of the first node in the IAB network, the first node determines that cell reselection is needed after determining that the hop count information of the parent node is greater than the hop count information of the first node.

In a third aspect, an embodiment of the present invention provides another apparatus for cell selection, including:

the selection module is used for selecting a second node from the IAB network according to the node information of the descendant node used for determining the first node in the IAB network in the process of cell selection or cell reselection;

and the access module is used for accessing the second node.

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

BAP address information of the descendant node.

Optionally, the apparatus further includes a processing module, where before the selecting module selects the second node from the IAB network, the processing module is specifically configured to:

determining the ID information by at least one of:

receiving ID information reported by a descendant node of the first node;

determining the hop count information by at least one of:

receiving hop count information of a parent node of the first node;

Optionally, the processing module is further configured to:

And sending the broadcast information of the first node.

Optionally, the broadcast information includes the hop count information; the processing module is further configured to:

Optionally, the processing module is specifically configured to:

a second node is selected from the set of candidate nodes.

Optionally, the processing module is specifically configured to:

Optionally, the processing module is further configured to:

Optionally, the processing module determines the node meeting the power requirement by:

Optionally, the processing module is further configured to:

Optionally, the node information includes the hop count information; the processing module is specifically configured to:

Optionally, the processing module is further configured to:

Optionally, the processing module is specifically configured to:

Optionally, the processing module is further configured to:

In a fourth aspect, embodiments of the present invention provide a computer-readable medium on which a computer program is stored, which when executed by a processor implements the steps of the method according to any one of the first aspect.

The embodiment of the invention provides a method for selecting the second node in the IAB network according to the node information used for determining the descendant node of the first node in the IAB network, and then the first node is accessed to the second node, so that the first node can be prevented from being accessed to the descendant node of the first node, the return link forms a loop, and the robustness of data transmission of the IAB node can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic view of an IAB network topology;

FIG. 2 is a schematic diagram of an IAB node structure;

FIG. 3 is a diagram illustrating an IAB node1 accessing to a descendant node;

fig. 4 is a flowchart illustrating a cell selection method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a candidate node set according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a second cell selection method according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating a third method for cell selection according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating a fourth cell selection method according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating a fifth cell selection method according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating a sixth cell selection method according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a cell selection apparatus according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of another cell selection apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

"and/or" in the embodiment of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiment of the invention, "determine B according to a" does not mean that B is determined only according to a, but may also be determined according to a and other information. "A includes B" does not mean that A includes only B, and A may also include other information, such as C, D, etc.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

In the embodiment of the present application, information (information), signal (signal), message (message), channel (channel) may be mixed, and it should be noted that the intended meanings are consistent when the differences are not emphasized. "of", "corresponding", and "corresponding" may sometimes be used in combination, it being noted that the intended meaning is consistent when no distinction is made.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

For the convenience of understanding the embodiments of the present application, first, a scenario applicable to the embodiments of the present application will be described in detail by taking the IAB network topology shown in fig. 1 as an example.

As shown in fig. 1, in an IAB network deployment, the IAB network deployment is composed of an IAB node (IAB host node or central control node), an IAB node (node), and a UE (User Equipment). The IAB donor is used for connecting the core network, returning the information of the IAB node and the UE to the core network and transmitting the information of the core network to the IAB node and the UE. The IAB donor is also responsible for managing IAB nodes throughout the IAB network.

The IAB node relays and transmits the information of the UE to the IAB donor through a radio link (Uu interface), and relays and transmits the information of the IAB donor to the UE. The IAB nodes and the IAB donors are connected through wireless links, namely Uu interfaces.

The relay function of the IAB node is implemented by a BAP layer (Backhaul attachment Protocol layer) in the IAB node.

As shown in fig. 1, in the IAB network, IAB node1 is a parent node of IAB node2, IAB node 3 is a child node of IAB node2, and IAB node 3 is a descendant node of IAB node 1. As can also be seen from fig. 1, IAB node2 is an upper node directly connected to IAB node1, IAB node 3 is a lower node directly connected to IAB node2, and IAB node 3 is a lower node indirectly connected to IAB node 2.

In the existing IAB network topology, one IAB node is composed of two parts, as shown in fig. 2, one part is a DU part in an IAB MT (IAB Mobile Termination) pair connected to a base station or an IAB node, and the base station or the IAB node is called its parent node; the other part is the MT part of the IAB DU (IAB Distributed Unit) pair downstream connected UE or IAB node, which is called its child node.

For the existing 5G Uu interface, when the link between the UE and the network is interrupted, the UE determines that the RLF occurs on the link between the UE and the network. Similar to the Uu interface, if the link between the IAB node and its parent node is broken, and the IAB node determines that the link between the IAB node and its parent node has RLF, the IAB node will send an RLF notification (notification) message to its child node, notify its child node that the RLF has occurred between the child node and its parent node, and cannot continue to provide access and backhaul services for its child node.

After receiving the RLF notification information sent by the parent node, the child node performs cell reselection, thereby selecting other IAB nodes for access and performing subsequent service transmission.

In the process of cell reselection, the IAB child node may select a descendant node of the IAB child node, so that the IAB network topology graph forms a loop, and information of the IAB node in the loop cannot be normally transmitted to the IAB donor node, that is, the IAB node in the loop cannot normally operate.

For example, as shown in fig. 3, it is a schematic diagram of IAB node1 accessing to a descendant node. As can be seen from fig. 3, IAB node 3 is a descendant node of IAB node1, IAB node 3 is accessed to IAB node2, IAB node2 is accessed to IAB node1, if IAB node1 is accessed to IAB node 3, a loop is formed among IAB node1, IAB node2, and IAB node 3, as shown by the dotted arrow in fig. 3, IAB node1, IAB node2, and IAB node 3 cannot normally operate.

Based on the above problem, an embodiment of the present invention provides a cell selection method, as shown in fig. 4, the method includes:

s401, a first node selects a second node from an IAB network according to node information for determining a descendant node of the first node in the IAB network in the process of cell selection or cell reselection;

s402, the first node accesses the second node.

The first node performs cell selection, that is, the first node is not connected to any node in the IAB network before, and when the first node needs to be connected to a node in the IAB network, cell selection needs to be performed; the first node performs cell reselection, that is, the first node is connected to a node in the IAB network before, and for some reason, the first node is disconnected from the node, and at this time, the first node needs to perform cell reselection. For example, after receiving the RLF notification sent by the parent node of the first node, the first node determines that cell reselection is required.

In this embodiment of the present invention, the node information of the descendant node of the first node may include ID information and/or hop count information, and it should be noted that the hop count information is hop count information from a node in the IAB network to the IAB donor.

For example, if the first node reaches the IAB donor through N other IAB nodes, the hop count information of the first node is N +1, that is, the hop count of the IAB donor is 0, and the hop count of the IAB node directly connected to the IAB donor is 1.

Here, the ID information may be part or all of the following information: cell information, address information, and BAP address information, that is, cell information of a descendant node, address information of a descendant node, and BAP address information of the descendant node.

The ID information is used to determine whether a node in the IAB network is a descendant node of the first node.

Specifically, the ID information may be determined in at least one of the following ways in the embodiment of the present invention:

a first node receives ID information configured by an IAB node or OAM (Operation Administration and Maintenance) equipment in an IAB network;

the first node acquires ID information from the received broadcast information of the node in the IAB network;

and the first node receives the ID information reported by the descendant nodes of the first node.

That is to say, the IAB donor OAM device in the IAB network may configure the ID information of the descendant node of the first node for the first node, the first node may also obtain the ID information of the descendant node of the first node from the received broadcast information, and the first node may also receive the ID information reported by the descendant node of the first node.

The OAM equipment is a central control node, and in the embodiment of the present invention, except for the OAM equipment, the embodiment of the present invention is applicable to a central control node that can configure ID information for the first node.

It should be noted that, the first node receives the ID information reported by the descendant node of the first node, and may adopt a step-by-step reporting manner, for example, as shown in fig. 1, the descendant node IAB 3 of the IAB node1 reports the ID information to the IAB node2, and the IAB node2 reports the received ID information of the IAB node 3 to the IAB node 1.

The hop count information may be determined in at least one of the following ways:

a first node receives hop count information configured by an IAB donor OAM device in an IAB network;

the first node acquires hop count information from the received broadcast information of the nodes in the IAB network.

It should be noted that, when the first node receives the hop count information of the parent node of the first node, the first node obtains the received hop count information +1 of the parent node, which is the hop count information of the first node.

In an alternative embodiment, in the IAB network, a node may be updated, for example, a new node is added or a node is removed. When the first node determines the ID information of the descendant node of the first node according to the received ID information configured by the IAB donor the OAM device, if the descendant node of the first node changes, for example, a new descendant node joins or a descendant node leaves, the first node may update the node information of the descendant node of the first node according to the ID information configured by the IAB donor the OAM device for the first node, and may adopt an incremental method, that is, the ID information configured by the IAB donor the OAM device for the first node includes the node information of the changed descendant node, or may adopt a complete set transmission method, that is, the ID information configured by the IAB donor the OAM device for the first node includes information of all descendant nodes of the first node.

For example, in the IAB network, the node1, the node2, and the node 3 are descendants of the first node, and when the node 4 is added to the IAB network and the node 4 is a descendant of the first node, the IAB donor may reconfigure, for the first node, ID information of the descendant of the first node, where the ID information may include ID information of the node 4, or may include ID information of the node1, ID information of the node2, ID information of the node 3, and ID information of the node 4.

In a possible implementation manner, the first node may also report the ID information of the first node to a parent node of the first node, so that the parent node of the first node stores the ID information of the first node; and/or the first node can also send the broadcast information of the first node, so that other nodes in the IAB network receive the broadcast information of the first node and acquire the ID information of the first node from the broadcast information.

When the first node reports the ID information of the first node to the parent node of the first node, if the descendant node of the first node in the IAB network changes, for example, a new descendant node joins or a descendant node leaves, the first node needs to send the ID information to the parent node again, where the ID information may include information of the changed descendant node or information of all descendant nodes of the first node.

If the broadcast information of the first node sent by the first node includes the hop count information, before the first node sends the broadcast information of the first node, the first node may determine the hop count information of the first node according to the hop count information of the parent node.

In a possible implementation manner, when the first node selects the second node from the IAB network, the first node may determine a candidate node set in the IAB network according to node information of a descendant node of the first node, and then the first node selects the second node from the candidate node set.

In a specific implementation, the first node may determine the candidate node set in the following two ways, which are described below.

In the first mode, the first node determines nodes except for the descendant node in the IAB network according to the node information of the descendant node of the first node, and takes the determined nodes as a candidate node set.

For example, as shown in fig. 5, there are 13 IAB nodes in the IAB network, where node 7, node 8, node 9, and node 10 are descendant nodes of node2, and the determined candidate node set of node2 is { node1, node 3, node 6, node 11, and node 12 }.

And secondly, the first node determines nodes which are except the descendant node in the IAB network and meet the power requirement according to the node information of the descendant node of the first node, and the determined nodes form a candidate node set.

Specifically, the embodiment of the present invention determines whether a node meets the power requirement, and may first determine whether a node whose received power is greater than a first power threshold exists in the IAB network, and if so, the node whose received power is greater than the first power threshold is used as the node meeting the power requirement; if no node with the received power larger than the first power threshold value exists, the first power threshold value is reduced, and the node with the received power larger than the reduced first power threshold value is continuously judged until the reduced first power threshold value is smaller than the set minimum power threshold value.

The first power threshold may be an artificially set threshold; the first power threshold is decreased, which may be according to a preset value.

Correspondingly, if no node meeting the power requirement is in the nodes except the descendant node of the first node in the IAB network, the first node may send an RLF notification to the descendant nodes of the first node to disconnect the connection between the first node and the descendant nodes of the first node, and then select the nodes meeting the power requirement from the descendant nodes of the first node to form a candidate node set.

Since the connection between the first node and the child nodes of the first node is broken, the first node selects a second node to be accessed from the child nodes of the first node, and a loop is not formed.

In addition to the above-described manner of determining the candidate node set, when the node information includes hop count information, the candidate node set may be determined in the following two manners (manner three and manner four).

And thirdly, the first node selects the nodes of which the corresponding hop count information is less than or equal to that of the first node from the IAB network to form a candidate node set.

As described above, the hop count information is hop count information from a node in the IAB network to the IAB donor, and the node whose hop count information is equal to or less than the hop count information of the first node, that is, the upper node of the first node, does not include the descendant node of the first node.

It should be noted that the hop count information may be carried in the broadcast information of the node.

And fourthly, the first node selects the nodes of which the corresponding hop count information is less than or equal to that of the first node and which meet the power requirement from the IAB network, and the determined nodes form a candidate node set.

The nodes that meet the power requirements may be determined in the following manner. Firstly, judging whether a node with the received power larger than a second power threshold exists in the IAB network, and if so, taking the node with the received power larger than the second power threshold as a node meeting the power requirement; if not, the second power threshold value can be reduced according to the preset value, and then the step of judging whether the node with the received power larger than the reduced second power threshold value exists is returned until the reduced second power threshold value is smaller than the preset minimum power threshold value.

It should be noted that the second power threshold may be the same as or different from the first power threshold in the second embodiment, and the implementation of the present invention is not limited.

After the candidate node set is determined, the first node may select a node with the minimum hop count information from the determined candidate node set as the second node, may also select a node with the maximum received power as the second node, may also select a node with the minimum hop count information and the maximum received power as the second node, and may also randomly select a node from the determined candidate node set as the second node.

In a possible implementation manner, after determining that hop count information of a parent node of the first node is greater than hop count information of the first node, the first node determines to perform cell reselection.

In the embodiment of the invention, the first node selects the second node according to the node information for determining the descendant node of the first node in the IAB network in the process of cell selection or cell reselection, and the first node is accessed to the second node. The second node accessed by the first node is selected according to the node information used for determining the descendant node of the first node in the IAB network, so that the first node can be prevented from being accessed to the descendant node of the first node, the return link forms a loop, and the robustness of data transmission of the IAB node can be improved.

For the convenience of understanding, the cell selection method in the present invention is explained below by using specific embodiments.

Example 1:

fig. 6 is a schematic flow chart of a cell selection method according to an embodiment of the present invention.

S601, the first IAB node receives ID information of descendant nodes of the first IAB node;

s602, the first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s603, the first IAB node judges whether other IAB nodes except for the descendant node of the first IAB node exist according to the ID information of the descendant node of the first node, if so, S604 is executed, otherwise, S605 is executed;

s604, the first IAB node selects other IAB nodes except for the descendant node of the first IAB node for access;

s605, the first IAB node sends RLF notification information to the child nodes of the first IAB node;

and S606, the first IAB node selects any IAB node in the IAB network for access.

Example 2:

fig. 7 is a schematic flow chart of another cell selection method according to an embodiment of the present invention.

S701, the first IAB node receives ID information of a descendant node of the first IAB node;

s702, the first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s703, the first IAB node judges whether a node with the receiving power larger than the power threshold exists, if so, S704 is executed, otherwise, S707 is executed;

s704, the first IAB node takes the node with the receiving power larger than the power threshold value as a candidate node set;

s705, the first IAB node judges whether other IAB nodes except for the descendant node of the first IAB node exist in the candidate node set according to the ID information of the descendant node of the first node, if so, S706 is executed, otherwise, S709 is executed;

s706, the first IAB node selects one other IAB node except the descendant node of the first IAB node from the candidate node set for access;

it should be noted that the other IAB node selected in S706 may be the node with the smallest hop count information among the other IAB nodes selected in the candidate node set except for the descendant node of the first IAB node, the node with the largest received power, the node with the smallest hop count information and the largest received power, or a node randomly selected.

S707, the first IAB node reduces the power threshold;

s708, the first IAB node judges whether the reduced power threshold is less than or equal to the minimum power threshold, if so, S709 is executed, otherwise, S703 is executed;

s709, the first IAB node sends RLF notification information to the child nodes of the first IAB node;

s710, the first IAB node selects a node with a received power greater than the power threshold from the IAB network.

It should be noted that the node with the received power greater than the power threshold in the IAB network selected in S710 may be the node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the smallest hop count information and the largest received power among the nodes with the received power greater than the power threshold in the IAB network, or may be one node randomly selected from the nodes with the received power greater than the power threshold in the IAB network.

Example 3:

fig. 8 is a schematic flow chart of another cell selection method according to an embodiment of the present invention.

S801, the first IAB node confirms the hop count information of the first IAB node;

the first IAB node receives the hop count information +1 of the parent node of the first IAB node, which is the hop count information of the first IAB node.

S802, the first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s803, the first IAB node judges whether an IAB node with hop count information less than or equal to that of the first IAB node exists in the IAB network, if so, S804 is executed, otherwise, S809 is executed;

s804, the first IAB node selects the IAB node of which the hop count information is less than or equal to that of the first IAB node;

s805, the first IAB node judges whether at least one IAB node with the minimum hop count information exists in the selected IAB node, if so, S806 is executed, otherwise, S807 is executed;

s806, the first IAB node selects one node from at least one IAB node with the minimum hop count information to access;

in S806, the first IAB node may randomly select a node with the minimum hop count information from the at least one node with the minimum hop count information for access, and may also select a node with the minimum hop count information and the maximum received power for access;

s807, the first IAB node randomly selects one node to access;

in S807, the first node may randomly select a node from the selected nodes for access, and may also select a node with the maximum received power for access;

s808, optionally, the first IAB node determines whether the hop count information of the parent node of the first IAB node is greater than the hop count information of the first IAB node, if so, then S803 is executed, otherwise, the process is ended;

s809, the first IAB node sends RLF notification information to the child nodes of the first IAB node;

and S810, the first IAB node selects any node in the IAB network for access.

Example 4:

fig. 9 is a schematic flow chart of another cell selection method according to an embodiment of the present invention.

S901, the first IAB node determines the hop count information of the first IAB node;

S902, a first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s903, the first IAB node judges whether a node with the receiving power larger than the power threshold exists, if yes, S904 is executed, and if not, S911 is executed;

s904, the first IAB node takes the node with the receiving power larger than the power threshold value as a candidate node set;

s905, the first IAB node judges whether an IAB node with hop count information less than or equal to that of the first IAB node exists in the candidate node set, if yes, S906 is executed, and if not, S913 is executed;

s906, the first IAB node selects the IAB node with hop count information less than or equal to that of the first IAB node from the candidate node set;

s907, the first IAB node judges whether at least one IAB node with the minimum hop count information exists in the selected IAB node, if so, S908 is executed, otherwise, S909 is executed;

s908, the first IAB node randomly selects a node with the minimum hop count information from at least one node with the minimum hop count information for access, or selects a node with the minimum hop count information and the maximum received power for access;

s909, the first node randomly selects a node from the selected nodes for access, or selects a node with the maximum receiving power for access;

s910, optionally, after the first IAB node accesses the node, determining whether hop count information of a parent node of the first IAB node is greater than hop count information of the first IAB node, if so, executing S903, otherwise, ending;

s911, the first IAB node reduces the power threshold;

s912, the first IAB node judges whether the reduced power threshold is less than or equal to the minimum power threshold, if so, S913 is executed, otherwise, S903 is executed;

s913, the first IAB node sends RLF notification information to the child nodes of the first IAB node;

s914, the first IAB node selects a node from the IAB network having a received power greater than the power threshold.

It should be noted that the node with the received power greater than the power threshold in the IAB network selected in S914 may be the node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the smallest hop count information and the largest received power among the nodes with the received power greater than the power threshold in the IAB network, or may be one node randomly selected among the nodes with the received power greater than the power threshold in the IAB network.

Example 5:

fig. 10 is a schematic flow chart of another cell selection method according to an embodiment of the present invention.

S1001, the first IAB node determines hop count information of the first IAB node and receives ID information of descendant nodes of the first IAB node;

s1002, the first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s1003, the first IAB node judges whether a node with the receiving power larger than the power threshold exists, if yes, S1004 is executed, and if not, S1011 is executed;

s1004, the first IAB node selects nodes with the receiving power larger than a power threshold value, and forms the selected nodes into a candidate node set;

s1005, the first IAB node judges whether the candidate node set has an IAB node with hop count information less than or equal to the hop count information of the first IAB node, if so, the step S1006 is executed, otherwise, the step S1009 is executed;

s1006, the first IAB node judges whether at least one IAB node with the smallest hop count information exists in the IAB nodes with hop count information smaller than or equal to the hop count information of the first IAB node, if so, S1007 is executed, otherwise, S1008 is executed;

s1007, the first IAB node randomly selects a node with the minimum hop count information from at least one node with the minimum hop count information for access, or selects a node with the minimum hop count information and the maximum received power for access;

s1008, the first IAB node selects a node with the highest receiving power from the selected nodes to access;

s1009, the first IAB node judges whether other nodes except for the descendant node of the first IAB node exist in the candidate node set, if so, S1010 is executed, otherwise, S1014 is executed;

s1010, the first IAB node is accessed to other nodes except for the descendant node of the first IAB node in the candidate node set;

it should be noted that, in the candidate node set accessed in S1010, other nodes except for the descendant node of the first IAB node may be a node in the candidate node set whose received power is greater than the power threshold, a node in the candidate node set whose hop count information is minimum and whose received power is maximum, or a node randomly selected from the candidate node set.

S1011, the first IAB node reduces the power threshold;

s1012, the first IAB node determines whether the reduced power threshold is smaller than the minimum power threshold, if so, executes S1013, otherwise, executes S1003;

s1013, the first IAB node sends RLF notification information to the child nodes of the first IAB node;

s1014, the first IAB node accesses to one IAB node with the received power larger than the power threshold value in the IAB network.

It should be noted that the node with the received power greater than the power threshold in the IAB network selected in S1014 may be the node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be the node with the smallest hop count information and the largest received power among the nodes with the received power greater than the power threshold in the IAB network, or may be one node randomly selected from the nodes with the received power greater than the power threshold in the IAB network.

Based on the same inventive concept, the embodiment of the present invention provides a device for cell selection, and as the principle of the device for solving the problem is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are not repeated.

As shown in fig. 11, an apparatus for cell selection according to an embodiment of the present invention includes:

a processor 1100, a memory 1101, and a transceiver 1102;

the processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1101 may store data used by the processor 1100 in performing operations. The transceiver 1102 is used to receive and transmit data under the control of the processor 1100.

The bus architecture may include any number of interconnected buses and bridges, with one or more of the processor 1100, represented in particular by the processor 1100, and various circuits of the memory represented by the memory 1101, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1101 may store data used by the processor 1100 in performing operations.

The processes disclosed in the embodiments of the present invention can be implemented in the processor 1100, or implemented by the processor 1100. In implementation, the steps of the signal processing flow may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1100. The processor 1100 may be a general-purpose processor 1100, a digital signal processor 1100, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. The general purpose processor 1100 may be a microprocessor 1100 or any conventional processor 1100 or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be embodied directly in the hardware processor 1100, or in a combination of the hardware and software modules within the processor 1100. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1101, and the processor 1100 reads information in the memory 1101, and completes the steps of the signal processing flow in combination with hardware thereof.

The processor 1100 is configured to read the program in the memory 1101 and execute the following processes:

and accessing the second node.

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

BAP address information of the descendant node.

Optionally, the processor 1100 is further configured to:

receiving ID information reported by a descendant node of the first node;

determining the hop count information by at least one of:

receiving hop count information of a parent node of the first node;

Optionally, the processor 1100 is further configured to:

And sending the broadcast information of the first node.

Optionally, the broadcast information includes the hop count information; the processor 1100 is further configured to:

Optionally, the processor 1100 is specifically configured to:

a second node is selected from the set of candidate nodes.

Optionally, the processor 1100 is specifically configured to:

Optionally, the processor 1100 is further configured to:

Optionally, the processor 1100 determines the node meeting the power requirement by:

Optionally, the processor 1100 is further configured to:

Optionally, the node information includes the hop count information; the processor 1100 is specifically configured to:

Optionally, the processor 1100 is further configured to:

Optionally, the processor 1100 is specifically configured to:

Optionally, the processor 1100 is further configured to:

As shown in fig. 12, another apparatus for cell selection provided in the embodiment of the present invention includes:

a selecting module 1200, configured to select a second node from the IAB network according to node information used to determine a descendant node of a first node in the IAB network in a cell selection or cell reselection process;

an access module 1201, configured to access the second node.

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

BAP address information of the descendant node.

Optionally, the apparatus further includes a processing module 1202, and before the selecting module 1200 selects the second node from the IAB network, the processing module 1202 is specifically configured to:

determining the ID information by at least one of:

receiving ID information reported by a descendant node of the first node;

determining the hop count information by at least one of:

receiving hop count information of a parent node of the first node;

Optionally, the processing module 1202 is further configured to:

And sending the broadcast information of the first node.

Optionally, the broadcast information includes the hop count information; the processing module 1202 is further configured to:

Optionally, the processing module 1202 is specifically configured to:

a second node is selected from the set of candidate nodes.

Optionally, the processing module 1202 is specifically configured to:

Optionally, the processing module 1202 is further configured to:

Optionally, the processing module 1202 determines the node meeting the power requirement by:

Optionally, the processing module 1202 is further configured to:

Optionally, the node information includes the hop count information; the processing module 1202 is specifically configured to:

Optionally, the processing module 1202 is further configured to:

Optionally, the processing module 1202 is specifically configured to:

Optionally, the processing module 1202 is further configured to:

An embodiment of the present invention further provides a computer-readable non-volatile storage medium, which includes a program code, and when the program code runs on a computing terminal, the program code is configured to enable the computing terminal to perform the step of cell selection according to the embodiment of the present invention.

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of cell selection, the method comprising:

the method comprises the steps that a first node selects a second node from an IAB network according to node information used for determining a descendant node of the first node which is integrally accessed into the IAB network in the process of cell selection or cell reselection;

the first node accesses the second node.

2. The method of claim 1, wherein the node information comprises Identification (ID) information and/or hop count information, wherein the hop count information is hop count information of the descendant node to a home node or a central control node in the IAB network;

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

and the adaptive feedback BAP address information of the descendant nodes.

3. The method of claim 2, wherein prior to the first node selecting the second node from the IAB network, further comprising:

determining the ID information by at least one of:

determining the hop count information by at least one of:

the first node receives hop count information configured by a host node IAB donor OAM equipment in the IAB network;

4. The method of claim 3, wherein if a descendant node of the first node in the IAB network changes, the ID information of the IAB donor OAM device configuration received by the first node in the IAB network includes information of the changed descendant node or information of descendant nodes all owned by the first node.

5. The method of claim 3, wherein the method further comprises:

The first node transmits broadcast information of the first node.

6. The method of claim 5, wherein if a descendant node of the first node in the IAB network changes, the ID information reported by the first node to the parent node of the first node includes information of the changed descendant node or information of descendant nodes all of which are included in the first node.

7. The method of claim 5, wherein the hop count information is included in the broadcast information;

8. The method of claim 2, wherein the first node selects a second node from the IAB network, comprising:

the first node selects a second node from the set of candidate nodes.

9. The method of claim 8, wherein the determining, by the first node, the set of candidate nodes in the IAB network according to the node information of the descendant node comprises:

10. The method of claim 9, wherein the first node determines the set of candidate nodes in the IAB network according to the node information of the descendant node, further comprising:

and if no node meeting the power requirement is in the nodes except the descendant nodes in the IAB network, sending a Radio Link Failure (RLF) notification to the descendant nodes of the first node, and selecting the nodes meeting the power requirement from the descendant nodes of the first node to form a candidate node set.

11. The method of claim 9, wherein a node meeting a power requirement is determined by:

if so, taking the node with the received power larger than the first power threshold value as a node meeting the power requirement;

and if no node with the received power larger than the first power threshold value is taken as a node meeting the power requirement, reducing the first power threshold value, and returning to the step of judging whether a node with the received power larger than the reduced first power threshold value exists or not until the reduced first power threshold value is smaller than the set minimum power threshold value.

12. The method of any of claims 2 to 11, wherein before the first node selects the second node from the IAB network according to the node information in the IAB network, further comprising:

13. The method of claim 8, wherein the hop count information is included in the node information;

14. The method of claim 13, wherein the first node determines a set of candidate nodes in the IAB network from the node information of the first node, further comprising:

15. The method of claim 13, wherein a node meeting a power requirement is determined by:

and if no node with the received power larger than the second power threshold value is taken as a node meeting the power requirement, reducing the second power threshold value, and returning to the step of judging whether a node with the received power larger than the reduced second power threshold value exists or not until the reduced second power threshold value is smaller than the set minimum power threshold value.

16. The method of any of claims 13 to 15, wherein the first node selecting a second node from the set of candidate nodes comprises:

17. The method of any of claims 2 and 13 to 15, wherein before the first node selects a second node from the IAB network according to the node information of the first node in the IAB network, further comprising:

18. An apparatus for cell selection, the apparatus comprising: a processor, a memory, and a transceiver;

selecting a second node from the IAB network according to node information for determining a descendant node of a first node which is integrally accessed to the returned IAB network in the process of cell selection or cell reselection;

and accessing the second node.

19. The apparatus of claim 18, wherein the node information comprises ID information and/or hop count information, wherein the hop count information is hop count information of the descendant node to a home node or a central control node in the IAB network;

wherein the ID information includes part or all of:

ID information of the cell of the descendant node;

address information of the descendant node;

and the adaptive feedback BAP address information of the descendant nodes.

20. The device of claim 19, wherein the processor is further configured to:

receiving ID information configured by a host node IAB donor operation, maintenance and administration (OAM) equipment in the IAB network;

receiving ID information reported by a descendant node of the first node;

determining the hop count information by at least one of:

receiving hop count information of a parent node of the first node;

21. The apparatus of claim 20, wherein if a descendant node of the first node in the IAB network changes, the ID information of the configuration of the IAB donor OAM device in the IAB network received by the first node includes information of the changed descendant node or information of descendant nodes all of the first node.

22. The device of claim 20, wherein the processor is further configured to:

And sending the broadcast information of the first node.

23. The apparatus of claim 22, wherein if a descendant node of the first node in the IAB network changes, the ID information reported by the first node to the parent node of the first node includes information of the changed descendant node or information of descendant nodes all of which are included in the first node.

24. The apparatus of claim 22, wherein the hop count information is included in the broadcast information; the processor is further configured to:

25. The device of claim 19, wherein the processor is specifically configured to:

a second node is selected from the set of candidate nodes.

26. The device of claim 25, wherein the processor is specifically configured to:

27. The device of claim 26, wherein the processor is further configured to:

28. The apparatus of claim 26, wherein the processor determines a node that meets a power requirement by:

29. The apparatus of any of claims 19 to 28, wherein the processor is further configured to:

30. The apparatus of claim 25, wherein the hop count information is included in the node information; the processor is specifically configured to:

31. The device of claim 30, wherein the processor is further configured to:

determining a set of candidate nodes in the IAB network according to the node information of the first node,

32. The apparatus of claim 30, wherein the processor determines a node that meets a power requirement by:

33. The apparatus of any of claims 30 to 32, wherein the processor is specifically configured to:

34. The apparatus of any one of claims 19, 30 to 32, wherein the processor is further configured to:

35. A cell selection apparatus, comprising:

and the access module is used for accessing the second node.

36. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 17.