CN113905421B

CN113905421B - Cell selection method and device

Info

Publication number: CN113905421B
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: 2023-05-26
Anticipated expiration: 2040-06-22
Also published as: CN113905421A; WO2021258783A1

Abstract

The invention discloses a cell selection method and device, which are used for solving the problem that an IAB node in the prior art forms a loop when selecting cells or reselecting cells, and the nodes in the loop cannot work normally. The method comprises the following steps: and the first node selects a second node according to node information for determining descendant nodes 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 for determining the descendant node of the first node in the IAB network, so that the first node is prevented from accessing the descendant node of the first node, a return link is formed into a loop, and the robustness of the IAB node for transmitting data can be improved.

Description

Cell selection method and device

Technical Field

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

Background

The IAB (Integrated Access and Backhaul) integrated access backhaul) network technology achieves the purpose of expanding the coverage of a base station by relaying wireless signals among a plurality of nodes. The IAB network technology is a network networking mode that solves the base station coverage problem in the fifth generation (5th Generation,5G) in the future.

In the IAB network, on the one hand, when the IAB node and its parent node generate RLF (radio link failure ), the IAB node notifies its child node, so that the child node reselects other base stations or the IAB node to access, i.e. performs cell reselection, thereby recovering the access and backhaul link of the child node; on the other hand, when the IAB node is not connected to other nodes, the IAB node needs to be connected to other nodes, i.e. perform cell selection, in order to form a backhaul link.

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

Disclosure of Invention

The invention provides a cell selection method and device, which are used for solving the problem that an IAB node in the prior art can not normally work when the IAB node is selected or reselected in a cell, so that a return link of the IAB node forms a loop.

Based on the above-mentioned problem, in a first aspect, an embodiment of the present invention provides a method for selecting a cell, where the method includes:

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

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 offspring node to a host node or a central control node in the IAB network;

wherein the ID information includes part or all of the following:

ID information of a 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:

the ID information is determined by at least one of the following means:

the first node receives ID information configured by a host node IAB donor or operation maintenance management 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 or 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 node or 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 comprises:

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 of the first node 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 comprises:

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 first node selects a second node from the IAB network, including:

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 (b)

And the first node determines nodes which are except for 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 first node determines a candidate node set in the IAB network according to the node information of the descendant node, and further includes:

and if the nodes except the descendant nodes in the IAB network do not have the nodes meeting the power requirements, sending an RLF notification to the child nodes of the first node, and selecting the nodes meeting the power requirements from the descendant nodes of the first node to form a candidate node set.

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

judging whether a node with the received power larger than a first power threshold exists or not;

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

if no node with the received power being larger than the first power threshold is used as the node meeting the power requirement, the first power threshold is reduced, and the step of judging whether the node with the received power being larger than the first power threshold exists or not is returned until the reduced first power threshold is smaller than the set minimum power threshold.

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 required.

Optionally, the node information includes the hop count information;

the first node determines a candidate node set in the IAB network according to node information of the first node, and the method comprises the following steps:

the first node selects nodes with the corresponding hop count information smaller than or equal to the hop count information of the first node from the IAB network to form a candidate node set; or (b)

And the first node determines the node which is smaller than or equal to the corresponding hop count information of the first node and meets the power requirement from the IAB network, and forms the determined node into a candidate node set.

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

and if the corresponding hop count information in the IAB network is smaller than or equal to the hop count information of the first node, no node meeting the power requirement exists in the nodes, sending an RLF notification to the child nodes of the first node, and selecting the node 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:

judging whether a node with the received power larger than a second power threshold exists or not;

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

if no node with the received power being larger than the second power threshold is used as the node meeting the power requirement, the second power threshold is reduced, and the step of judging whether the node with the received power being larger than the second power threshold exists or not is returned until the reduced second power threshold is smaller than the set minimum power threshold.

Optionally, the first node selects a second node from the candidate node set, including:

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

Optionally, before the first node selects the 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 the first node determines that the hop count information of the parent node is larger than that of the first node, determining that cell reselection is required.

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

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

selecting 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 a cell selection or cell reselection process;

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 offspring node to a host node or a central control node in the IAB network;

Wherein the ID information includes part or all of the following:

ID information of a 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:

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

receiving ID information configured by IAB donor or OAM equipment in the IAB network;

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

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

determining the hop count information by at least one of:

receiving hop count information configured by IAB donor or OAM equipment 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 nodes 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 transmitting the broadcast information of the first node.

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

and before the broadcast information of the first node is sent, determining the hop count information of the first node 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 offspring nodes;

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

Optionally, the processor is specifically configured to:

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

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

Optionally, the processor is further configured to:

when determining a 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 notification to the child node of the first node, and selecting the node 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 before selecting a second node from the IAB network according to the node information in the IAB network, after receiving the RLF notification sent by the parent node of the first node, determining that cell reselection is required.

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

selecting nodes with the corresponding hop count information smaller than or equal to the hop count information of the first node from the IAB network to form a candidate node set; or (b)

And determining nodes which are smaller than or equal 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 the corresponding hop count information in the IAB network is smaller than or equal to the hop count information of the first node, and if no node meeting the power requirement exists in the nodes, sending an RLF notification to the child nodes of the first node, and selecting the node meeting the power requirement from the offspring 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 receiving power from the candidate node set as a second node.

Optionally, the processor is further configured to:

and 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 required 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:

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

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

Wherein the ID information includes part or all of the following:

ID information of a 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:

the ID information is determined by at least one of the following means:

receiving ID information reported by descendant nodes 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 transmitting 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 storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of the first aspects.

The embodiment of the invention provides a method for selecting the second node in the IAB network according to the node information 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 is prevented from accessing the descendant node of the first node, a return link is formed into a loop, and the robustness of the IAB node for transmitting data can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

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

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

FIG. 3 is a schematic diagram of IAB node 1 accessing a offspring node;

fig. 4 is a schematic flow chart of 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 flow chart of a second cell selection method according to an embodiment of the present invention;

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

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

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

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

Fig. 11 is a schematic structural diagram of a cell selection device 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 more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the embodiment of the invention, "and/or", the description of the association relationship of the association object indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

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

In addition, in the embodiments of the present application, the term "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 use of an example is intended to present concepts in a concrete fashion.

In the embodiment of the present application, information, signals, messages, channels may be mixed in some cases, and it should be noted that, when the distinction is not emphasized, the meaning to be expressed is consistent. "of", "corresponding" and "corresponding" are sometimes used in combination, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

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

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

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

The relay function of the IAB node is implemented by a BAP layer (Backhaul Adaptation Protocol layer, adaptive backhaul 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 child 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, IAB mobile terminal) pair, to which a base station or an IAB node is connected, and the base station or the IAB node is called a parent node thereof; the other part is the MT part of the IAB DU (IAB Distributed Unit ) pair down-connect 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 broken, the UE determines that RLF has occurred in the link between the UE and the network. Similar to Uu interface, if the link between the IAB node and its parent node is interrupted, and if the IAB node determines that the link between the IAB node and its parent node has RLF, the IAB node will send RLF notification (notification) information to its child node, notifying that RLF has occurred between the child node and the parent node, and can not 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, so as to select other IAB nodes to access, and perform subsequent service transmission.

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

For example, as shown in fig. 3, an IAB node 1 is schematically connected to a offspring node. As can be seen from fig. 3, IAB node 3 is a descendant node of IAB node 1, IAB node 3 is connected to IAB node 2, IAB node 2 is connected to IAB node 1, and if IAB node 1 is connected to IAB node 3, a loop is formed between IAB node 1, IAB node 2, and IAB node 3, as indicated by the dotted arrows in fig. 3, and IAB node 1, IAB node 2, and IAB node 3 cannot operate normally.

Based on the above-mentioned problems, an embodiment of the present invention provides a cell selection method, as shown in fig. 4, including:

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

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, i.e. the first node has been connected to a node in the IAB network before, and for some reason is disconnected from the node, at which point the first node needs to perform cell reselection. For example, after receiving an RLF notification sent by a parent node of the first node, the first node determines that cell reselection is required.

In the 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 node.

For example, when 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.

The ID information here may be part or all of the following information: cell information, address information, BAP address information, that is, cell information of a descendant node, address information of a descendant node, BAP address information of a 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 embodiment of the present invention may determine the ID information in at least one of the following manners:

the first node receives ID information configured by IAB donor or OAM (Operation Administration and Maintenance, operation maintenance management) equipment in the IAB network;

the first node acquires 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.

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

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

It should be noted that, when the first node receives ID information reported by a descendant node of the first node, a step-by-step reporting manner may be adopted, for example, as shown in fig. 1, the descendant node IAB node 3 of the IAB node 1 reports ID information to the IAB node 2, and the IAB node 2 reports the received ID information of the IAB node 3 to the IAB node 1.

The embodiment of the invention can determine the hop count information by at least one of the following modes:

the first node receives hop count information configured by IAB donor or OAM equipment 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 will receive the hop count information +1 of the parent node, that is, the hop count information of the first node.

In an alternative embodiment, in an IAB network, a node may be updated, such as with a new node joining, or with a node leaving. 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 node or the OAM device, if the descendant node of the first node changes, for example, a new descendant node is added or a descendant node is left, 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 node or the OAM device for the first node, and may use an incremental method, that is, the node information of the changed descendant node is included in the ID information configured by the IAB node or the OAM device for the first node, or may use a method of transmitting the whole set, that is, the information of all the descendant nodes of the first node is included in the ID information configured by the IAB node or the OAM device for the first node.

For example, in an IAB network, when node 1, node 2, and node 3 are descendant nodes of a first node, and when node 4 joins the IAB network and node 4 is a descendant node of the first node, the IAB node may reconfigure ID information of the descendant node of the first node for the first node, where the ID information may include ID information of node 4, ID information of node 1, ID information of node 2, ID information of node 3, and ID information of node 4.

In one possible implementation manner, the first node may further 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 may further 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 a descendant node of the first node changes in the IAB network, 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 the descendant nodes of the first node.

If the first node's broadcast information includes hop count information, the first node may determine hop count information of the first node according to the parent node's hop count information before the first node transmits the first node's broadcast information.

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

In practice, the first node may determine the candidate node set in 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 node information of the descendant node of the first node, and takes the determined nodes as candidate node sets.

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 node 2, the determined candidate node set of node 2 is { node 1, node 3, node 6, node 11, node 12}.

And determining nodes which are in the IAB network and meet the power requirements except for the descendant nodes according to the node information of the descendant nodes of the first node by the second mode, and forming a candidate node set by the determined nodes.

Specifically, the embodiment of the invention judges whether the node meets the power requirement, can judge whether the node with the received power larger than the first power threshold exists in the IAB network, if so, the node with the received power larger than the first power threshold is used as the node meeting the power requirement; if no node with the received power being larger than the first power threshold value exists, the first power threshold value is reduced, and the node with the received power being 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 a threshold set manually; the first power threshold is lowered, which may be lowered by a preset value.

Correspondingly, if no node meeting the power requirement exists in the nodes except the descendant nodes of the first node in the IAB network, the first node can send an RLF notification to the child nodes of the first node so as to disconnect the connection between the first node and the child nodes of the first node, and then select the node 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 node of the first node is disconnected, the first node selects the second node to be accessed from the descendant 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 hop count information is included in the node 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 with the corresponding hop count information smaller 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 node, and the hop count information is less than or equal to the hop count information of the first node, that is, an upper node of the first node, excluding descendant nodes of the first node.

Note that the hop count information may be carried in broadcast information of the node.

And in a fourth mode, the first node selects the node which has the corresponding hop count information smaller than or equal to the hop count information of the first node and meets the power requirement from the IAB network, and the determined nodes form a candidate node set.

The nodes meeting the power requirements can be determined in the following manner. Firstly judging whether nodes with the received power larger than a second power threshold exist in an IAB network, and if so, taking the nodes with the received power larger than the second power threshold as nodes 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 or not is returned until the reduced second power threshold value is smaller than the preset minimum power threshold value.

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 smallest hop count information from the determined candidate node set as the second node, may select a node with the largest receiving power as the second node, may select a node with the smallest hop count information and the largest receiving power as the second node, and may also randomly select one node from the determined candidate node set as the second node.

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

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 selecting or reselecting the cell, 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 for determining the descendant node of the first node in the IAB network, so that the first node is prevented from accessing the descendant node of the first node, a return link is formed into a loop, and the robustness of the IAB node for transmitting data can be improved.

For ease of understanding, the cell selection method of the present invention will be described below by way of specific examples.

Example 1:

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

S601, a 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 nodes of the first IAB node exist according to the ID information of the descendant nodes of the first node, if so, S604 is executed, otherwise S605 is executed;

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

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

s606, the first IAB node selects any IAB node in the IAB network to 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 descendant nodes of the first IAB node;

s702, a 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 received power larger than a power threshold exists, if so, S704 is executed, otherwise S707 is executed;

s704, the first IAB node takes the node with the received 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 nodes of the first IAB node exist in the candidate node set according to the ID information of the descendant nodes of the first node, if so, S706 is executed, otherwise S709 is executed;

S706, the first IAB node selects one IAB node except for the descendant nodes of the first IAB node from the candidate node set to access;

the other IAB nodes selected in S706 may be nodes with the smallest hop count information among the other IAB nodes except the descendant node of the first IAB node, may be nodes with the largest received power, may be nodes with the smallest hop count information, and may be nodes with the largest received power, or may be randomly selected nodes.

S707, the first IAB node reduces the power threshold;

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

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

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

Note that, the node with the received power greater than the power threshold in the IAB network selected in S710 may be a 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 a node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be a node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, and may be a node with the largest received power, or may be a node randomly selected among 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, a first IAB node confirms 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, a first IAB node receives RLF notification information sent by a parent node of the first IAB node;

s803, the first IAB node judges whether IAB nodes with the hop count information smaller than or equal to that of the first IAB node exist in the IAB network, if yes, S804 is executed, otherwise S809 is executed;

s804, the first IAB node selects the IAB node with the hop count information smaller than or equal to the hop count information 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 yes, 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 smallest hop count information from at least one node with the smallest hop count information to access, or may select a node with the smallest hop count information and the largest received power to access;

S807, the first IAB node randomly selects one node for access;

in S807, the first node may randomly select a node from the selected nodes to access, or may select a node with the highest received power to access;

s808, optionally, the first IAB node judges whether the hop count information of the parent node of the first IAB node is larger than the hop count information of the first IAB node, if yes, S803 is executed, otherwise, the processing is finished;

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

s810, the first IAB node selects any node in the IAB network to access.

Example 4:

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

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

S902, the 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 received power larger than a power threshold exists, if yes, S904 is executed, otherwise S911 is executed;

S904, the first IAB node takes the node with the received power larger than the power threshold value as a candidate node set;

s905, the first IAB node judges whether IAB nodes with the hop count information smaller than or equal to that of the first IAB node exist in the candidate node set, if yes, S906 is executed, otherwise S913 is executed;

s906, the first IAB node selects IAB nodes with the hop count information smaller 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 yes, S908 is executed, and 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 to access, or selects a node with the minimum hop count information and the maximum receiving power to access;

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

s910, after the first IAB node accesses the node, judging whether the hop count information of the parent node of the first IAB node is larger than that of the first IAB node, if yes, 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 smaller than or equal to the minimum power threshold, if yes, S913 is executed, otherwise S903 is executed;

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

s914, the first IAB node selects a node with the received power larger than the power threshold from the IAB network.

The node with the received power greater than the power threshold in the IAB network selected in S914 may be a 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 a node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be a node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, and may be a node with the largest received power, or may be a 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 received power larger than a power threshold exists or not, if yes, S1004 is executed, otherwise S1011 is executed;

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

s1005, the first IAB node judges whether IAB nodes with hop count information smaller than or equal to the hop count information of the first IAB node exist in the candidate node set, if so, S1006 is executed, otherwise S1009 is executed;

s1006, the first IAB node judges whether at least one IAB node with the minimum hop count information exists in the IAB nodes with the hop count information smaller than or equal to the hop count information of the first IAB node, if yes, S1007 is executed, and 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 to access, or selects a node with the minimum hop count information and the maximum receiving power to access;

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

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

S1010, accessing the first IAB node to other nodes except for descendant nodes of the first IAB node in the candidate node set;

the other nodes in the candidate node set accessed in S1010 except for the descendant node of the first IAB node may be nodes in the candidate node set, where the received power is greater than the power threshold, may be nodes in the candidate node set, where the hop count information is minimum, and may be nodes in the candidate node set, where the received power is maximum, or may be randomly selected one node in the candidate node set.

S1011, the first IAB node reduces the power threshold;

s1012, the first IAB node judges whether the reduced power threshold is smaller than the minimum power threshold, if yes, S1013 is executed, otherwise S1003 is executed;

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

s1014, the first IAB node accesses to an IAB node in the IAB network with a received power greater than a power threshold.

The node with the received power greater than the power threshold in the IAB network selected in S1014 may be a 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 a node with the largest received power among the nodes with the received power greater than the power threshold in the IAB network, may be a node with the smallest hop count information among the nodes with the received power greater than the power threshold in the IAB network, and may be a node with the largest received power, or may be a node randomly selected among 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 cell selection device, and since the principle of the device for solving the problem is similar to that of the method, the implementation of the device can refer to the implementation of the method, and the repetition is omitted.

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 comprise any number of interconnecting buses and bridges, and in particular, the various circuits of the memory, represented by the one or more processors 1100 and the memory 1101, represented by the processor 1100, are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described 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 flow disclosed in the embodiments of the present invention may be applied to the processor 1100 or implemented by the processor 1100. In implementation, the steps of the signal processing flow may be performed by integrated logic circuitry in hardware or instructions in 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 device, discrete hardware components, where the methods, steps, and logic blocks disclosed in embodiments of the invention may be implemented or performed. 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 an embodiment of the present invention may be embodied directly in hardware processor 1100 for execution, or in a combination of hardware and software modules in processor 1100. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as 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 steps of the signal processing flow in combination with its hardware.

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

and accessing the second node.

wherein the ID information includes part or all of the following:

ID information of a 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 descendant nodes 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 transmitting 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 selecting a cell according to an embodiment of the present invention includes:

a selecting module 1200, configured to select, during cell selection or cell reselection, a second node from an IAB network according to node information for determining a descendant node of the first node in the IAB network;

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

wherein the ID information includes part or all of the following:

ID information of a 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, where before the selecting module 1200 selects the second node from the IAB network, the processing module 1202 is specifically configured to:

The ID information is determined by at least one of the following means:

receiving ID information reported by descendant nodes 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 transmitting 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:

The embodiments of the present application also provide a computer readable non-volatile storage medium comprising program code for causing a computing terminal to perform the steps of cell selection described above in embodiments of the present invention, when the program code is run on the computing terminal.

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 illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, 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 present application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Still further, 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 modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

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

in the process of cell selection or cell reselection, a first node determines a candidate node set formed by nodes except for descendant nodes in an IAB network according to node information of the descendant nodes of the first node in the integrated access backhaul IAB network;

The first node selects a second node from the candidate node set;

the first node accesses the second node.

2. The method of claim 1, wherein the node information includes identification, ID, information and/or hop count information, wherein the hop count information is hop count information of 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 the following:

ID information of a cell of the descendant node;

address information of the descendant node;

the offspring node's adaptability returns BAP address information.

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

the ID information is determined by at least one of the following means:

Determining the hop count information by at least one of:

the first node receives hop count information configured by a host node IAB donor or 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 configured by the IAB node or 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.

5. A method as claimed in 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 changes in the IAB network, the first node reports the ID information of the first node to the parent node including information of the changed descendant node or information of all descendant nodes of the first node.

7. The method of claim 5, wherein the broadcast information includes the hop count information therein;

8. The method of claim 1, wherein the first node determines a candidate node set of nodes in the IAB network other than the descendant node based on node information of the descendant nodes of the first node in an integrated access backhaul IAB network, comprising:

9. The method of claim 8, wherein the first node determines a set of candidate nodes in the IAB network based on node information for the descendant nodes, further comprising:

and if the nodes except the descendant nodes in the IAB network do not have the nodes meeting the power requirements, sending a Radio Link Failure (RLF) notification to the child nodes of the first node, and selecting the nodes meeting the power requirements from the descendant nodes of the first node to form a candidate node set.

10. The method of claim 8, wherein the power-requiring node is determined by:

if no node with the received power being larger than the first power threshold is used as the node meeting the power requirement, the first power threshold is reduced, and the step of judging whether the node with the received power being larger than the reduced first power threshold exists or not is returned until the reduced first power threshold is smaller than the set minimum power threshold.

11. The method according to any of claims 2-10, wherein before the first node selects the second node from the IAB network based on node information in the IAB network, further comprising:

12. The method of claim 2 wherein said node information includes said hop count information;

13. The method of claim 12, wherein the first node determines a set of candidate nodes in the IAB network based on the node information of the first node, further comprising:

14. The method of claim 12, wherein the power-requiring node is determined by:

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

If no node with the received power being larger than the second power threshold is used as the node meeting the power requirement, the second power threshold is reduced, and the step of judging whether the received power is larger than the reduced second power threshold is returned until the reduced second power threshold is smaller than the set minimum power threshold.

15. The method according to any of claims 12-14, wherein the first node selecting a second node from the set of candidate nodes comprises:

16. The method of any of claims 2, 12-14, wherein the first node, prior to selecting a second node from the IAB network based on node information of the first node in the IAB network, further comprises:

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

In the process of cell selection or cell reselection, determining a candidate node set formed by nodes except for a descendant node in an IAB (integrated access backhaul) network according to node information of the descendant node of a first node in the IAB network;

selecting a second node from the set of candidate nodes;

and accessing the second node.

18. The apparatus of claim 17, 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 the following:

ID information of a cell of the descendant node;

address information of the descendant node;

the offspring node's adaptability returns BAP address information.

19. The apparatus of claim 18, wherein the processor is further configured to:

receiving ID information configured by a host node IAB donor or operation maintenance management OAM equipment in the IAB network;

Receiving ID information reported by descendant nodes 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;

20. The apparatus of claim 19, wherein if a descendant node of the first node in the IAB network changes, the ID information configured by the IAB node or 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.

21. The apparatus of claim 19, wherein the processor is further configured to:

And transmitting the broadcast information of the first node.

22. The apparatus of claim 21 wherein if a descendant node of the first node changes in the IAB network, the ID information of the first node 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.

23. The apparatus of claim 21 wherein said broadcast information includes said hop count information therein; the processor is further configured to:

24. The apparatus of claim 17, wherein the processor is specifically configured to:

25. The apparatus of claim 24, wherein the processor is further configured to:

26. The apparatus of claim 24, wherein the processor determines the power-compliant node by:

27. The apparatus of any one of claims 18 to 26, wherein the processor is further configured to:

28. The apparatus of claim 18 wherein said node information includes said hop count information therein; the processor is specifically configured to:

29. The apparatus of claim 28, wherein the processor is further configured to:

determining a set of candidate nodes in the IAB network based on the node information of the first node,

30. The apparatus of claim 28, wherein the processor determines the power-compliant node by:

31. The apparatus of any one of claims 28 to 30, wherein the processor is specifically configured to:

32. The apparatus of any one of claims 18, 28-30, wherein the processor is further configured to:

33. A cell selection apparatus, comprising:

a selection module, configured to determine, according to node information of a descendant node of a first node in an IAB network, a candidate node set formed by nodes in the IAB network except for the descendant node in a cell selection or cell reselection process; selecting a second node from the set of candidate nodes;

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

34. A computer storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method according to any of claims 1 to 16.