WO2022095759A1

WO2022095759A1 - Electronic device, wireless communication method and computer-readable storage medium

Info

Publication number: WO2022095759A1
Application number: PCT/CN2021/126536
Authority: WO
Inventors: 许晓东; 黄芷菡; 田璐; 张书蒙; 闫诗颖; 李锟; 李浩进; 崔焘
Original assignee: 索尼集团公司; 许晓东
Priority date: 2020-11-03
Filing date: 2021-10-27
Publication date: 2022-05-12
Also published as: CN114449596A

Abstract

The present disclosure relates to an electronic device, a wireless communication method and a computer-readable storage medium. According to the present disclosure, the electronic device for an integrated access and backhaul (IAB) node comprises a processing circuit, and is configured to: select a cell from conditional handover (CHO) candidate cells of the electronic device during cell selection or cell handover; and connect to the IAB node corresponding to the selected cell. By means of the electronic device, the wireless communication method and the computer-readable storage medium in the present disclosure, when an RLF occurs in an IAB network, the time for recovering a wireless link can be shortened. (FIG. 3)

Description

Electronic device, wireless communication method, and computer-readable storage medium

This application claims the priority of the Chinese patent application with the application number 202011209126.1 and the invention title "Electronic Device, Wireless Communication Method and Computer-readable Storage Medium" filed with the China Patent Office on November 3, 2020, the entire contents of which are by reference Incorporated in this application.

technical field

Embodiments of the present disclosure generally relate to the field of wireless communications, and in particular, to electronic devices, wireless communication methods, and computer-readable storage media. More specifically, the present disclosure relates to an electronic device for an IAB (Integrated Access and Backhaul, integrated access and backhaul) node, a wireless communication method performed by the electronic device for an IAB node, and a computer Readable storage medium.

Background technique

In the IAB network, the host (IAB donor) node can be connected to the core network through a cable, and the IAB node (IAB node) acting as a relay is directly or indirectly connected to the host node to connect to the core network. The donor node is also referred to as the donor base station. The IAB node integrates a wireless access (Access) link and a wireless backhaul (BH) link, where the access link is the communication link between the UE and the IAB node, and the backhaul link is between the IAB nodes Or the communication link between the IAB node and the host node. UE (User Equipment, user equipment) can be connected to the IAB node, or can be connected to the host node. That is, the UE may be connected to the host node through one or more IAB nodes or directly connected to the host node. The IAB technology is more suitable for dense scenarios, reducing the burden of deploying wired transmission networks and expanding the coverage of cells.

In an IAB network, an RLF (Radio Link Failure) may occur on the backhaul link of the IAB node, that is, the radio link between the IAB node and its parent node fails, resulting in a connection failure.

Therefore, it is necessary to propose a technical solution to shorten the time for restoring the radio link in the case of RLF occurring in the IAB network.

SUMMARY OF THE INVENTION

This section provides a general summary of the disclosure, rather than a comprehensive disclosure of its full scope or all of its features.

An object of the present disclosure is to provide an electronic device, a wireless communication method, and a computer-readable storage medium to shorten the time for restoring a wireless link in the event of an RLF occurring in an IAB network.

According to an aspect of the present disclosure, there is provided an electronic device for integrated access and backhaul IAB nodes, including a processing circuit configured to: when performing cell selection or cell handover, from the CHO( Conditional HandOver, Conditional Handover) select a cell among the candidate cells; and connect to the IAB node corresponding to the selected cell.

According to another aspect of the present disclosure, there is provided a wireless communication method performed by an electronic device for integrated access and backhauling an IAB node, comprising: when performing cell selection or cell handover, from a condition of the electronic device switching the selected cell among the CHO candidate cells; and connecting to the IAB node corresponding to the selected cell.

According to another aspect of the present disclosure, there is provided a computer-readable storage medium comprising executable computer instructions that, when executed by a computer, cause the computer to perform a wireless communication method according to the present disclosure.

Using the electronic device, wireless communication method, and computer-readable storage medium according to the present disclosure, when an IAB node performs cell selection or cell handover, a cell is selected from CHO candidate cells. In this way, CHO can be triggered at the time of cell selection or cell handover, so the time for restoring the radio link can be greatly shortened.

Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are for purposes of illustration only and are not intended to limit the scope of the disclosure.

Description of drawings

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. In the attached image:

1 is a schematic diagram showing the structure of an IAB network;

FIG. 2 is a schematic diagram illustrating an application scenario according to an embodiment of the present disclosure;

3 is a block diagram illustrating an example of a configuration of an electronic device for an IAB node according to an embodiment of the present disclosure;

4 is a signaling flow diagram illustrating a process for cell selection in the event of RLF at an IAB node according to an embodiment of the present disclosure;

5 is a signaling flow diagram illustrating a process for cell selection in the event that an RLF occurs at a parent node of an IAB node and RLF recovery fails, according to an embodiment of the present disclosure;

6 is a signaling flow diagram illustrating a process for cell handover in the event that an RLF occurs at a parent node of an IAB node and RLF recovery fails, according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram illustrating the setting of execution conditions of cell handover according to an embodiment of the present disclosure;

8 is a flowchart illustrating a wireless communication method performed by an electronic device for an IAB node according to an embodiment of the present disclosure;

9 is a block diagram showing a first example of a schematic configuration of an eNB (Evolved Node B, evolved Node B);

10 is a block diagram showing a second example of a schematic configuration of an eNB;

FIG. 11 is a block diagram showing an example of a schematic configuration of a smartphone; and

FIG. 12 is a block diagram showing an example of a schematic configuration of a car navigation apparatus.

While the present disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the accompanying drawings and are described in detail herein. It should be understood, however, that the description of specific embodiments herein is not intended to limit the disclosure to the specific forms disclosed, but on the contrary, the intention is to cover all falling within the spirit and scope of the disclosure Modifications, Equivalents and Substitutions. It will be noted that throughout the several views, corresponding reference numerals indicate corresponding parts.

Detailed ways

Examples of the present disclosure will now be described more fully with reference to the accompanying drawings. The following description is merely exemplary in nature and is not intended to limit the disclosure, application, or uses.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known structures and well-known technologies are not described in detail.

It will be described in the following order:

1. Description of the scene;

2. Configuration example of electronic equipment for IAB node;

3. Method embodiment;

4. Application examples.

<1. Description of the scene>

FIG. 1 is a schematic diagram showing the structure of an IAB network. As shown in Figure 1, the IAB host node is connected to the core network (Core Network, CN). In an IAB network, an IAB host node may include a CU (Central Unit, central unit) and a DU (Distributed Unit, distributed unit). Specifically, the IAB donor node may include one CU, which may be connected to one or more DUs, and the IAB node or UE may be connected to the DUs of the IAB donor node. As shown in Figure 1, IAB node 1 and IAB node 2 are connected to DU1 in the IAB host node through a backhaul link, UE1 is directly connected to DU1 in the IAB host node through an access link, and UE2 is connected through an access link. To IAB node 1, UE5 is connected to IAB node 2 through an access link, and IAB node 3 is connected to IAB node 2 through a backhaul link. Similarly, UE3 is connected to IAB node 3 through an access link, IAB node 4 is connected to IAB node 3 through a backhaul link, IAB node 5 is connected to IAB node 4 through a backhaul link, and UE4 is connected through an access link to IAB node 5.

In addition, in an IAB network, among two nodes connected to each other, the node on the side close to the core network can be called the parent node of the other node, and the other node can be called the side close to the core network. child nodes of the node. In addition, child nodes of a node, child nodes of child nodes, child nodes of child nodes of child nodes, . . . may be collectively referred to as descendant nodes of the node (may also be referred to as downstream nodes). It is worth noting that in this paper, the behavior of the IAB node is mainly discussed, so the child nodes and descendant nodes also mainly refer to the IAB nodes excluding the UE.

FIG. 2 is a schematic diagram illustrating an application scenario according to an embodiment of the present disclosure. For convenience of description, FIG. 2 intercepts a part of the structure of the IAB network of FIG. 1 . As shown in FIG. 2 , it is assumed that an RLF occurs at the IAB node 3, that is, a situation in which the wireless link between the IAB node 3 and the IAB node 2 fails. The operation of the IAB Node 3 will be discussed below for this situation, ie the operation of the IAB Node (IAB Node 3) in the event of an RLF of the IAB Node (IAB Node 3). Also, assume a situation where RLF occurs at IAB node 3 and recovery fails. The operation of the IAB node 4 will be discussed below for the case that the parent node (IAB node 3) of the IAB node (IAB node 4) experiences an RLF and the recovery fails.

In view of such a scenario, the present disclosure proposes an electronic device in a wireless communication system, a wireless communication method performed by the electronic device in the wireless communication system, and a computer-readable storage medium, so as to shorten the usage time when RLF occurs in an IAB network. time to restore the wireless link.

The wireless communication system according to the present disclosure may be a 5G NR communication system. Further, the IAB technology can be applied in the wireless communication system.

The host node according to the present disclosure may be a network side device. The network-side device may be a base station device deployed by an operator, for example, an eNB, or a gNB (a base station in a fifth-generation communication system). Further, the host node may include CUs and DUs.

The IAB node according to the present disclosure may include an MT (Mobile Termination, mobile terminal) unit and a DU, where the MT is used for connecting and communicating with the parent node of the IAB node, and the DU is used for connecting and communicating with the child nodes of the IAB node. Therefore, when the IAB node acts as a child node, the function of IAB-MT is similar to that of UE, so it can have the structure and behavior of UE; when the IAB node acts as a parent node, the function of IAB-DU is similar to that of network side equipment, so it can have The structure and behavior of network-side devices. That is to say, the IAB node may have the structure of the UE, and may also have the structure of the network side device.

The user equipment according to the present disclosure may be a mobile terminal (such as a smart phone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/dongle type mobile router, and a digital camera) or an in-vehicle terminal (such as a car navigation device) ). The user equipment may also be implemented as a terminal performing machine-to-machine (M2M) communication (also referred to as a machine type communication (MTC) terminal). Furthermore, the user equipment may be a wireless communication module (such as an integrated circuit module comprising a single die) mounted on each of the aforementioned terminals.

<2. Configuration example of electronic equipment for IAB node>

FIG. 3 is a block diagram illustrating an example of the configuration of an electronic device 300 for an IAB node according to an embodiment of the present disclosure.

As shown in FIG. 3 , the electronic device 300 may include a selection unit 310 , an access unit 320 and a communication unit 330 .

Here, each unit of the electronic device 300 may be included in the processing circuit. It should be noted that the electronic device 300 may include either one processing circuit or multiple processing circuits. Further, the processing circuit may include various discrete functional units to perform various different functions and/or operations. It should be noted that these functional units may be physical entities or logical entities, and units with different names may be implemented by the same physical entity.

According to an embodiment of the present disclosure, when the electronic device 300 performs cell selection or cell handover, the selection unit 310 may select a cell from the CHO candidate cells of the electronic device 300 .

According to an embodiment of the present disclosure, the access unit 320 may connect the electronic device 300 to the IAB node corresponding to the selected cell.

According to an embodiment of the present disclosure, the electronic device 300 may communicate with other devices through the communication unit 330 . For example, after the access unit 320 connects the electronic device 300 to the IAB node corresponding to the selected cell, the electronic device 300 may communicate with the IAB node through the communication unit 330 .

It can be seen that, according to the electronic device 300 of the embodiment of the present disclosure, when performing cell selection or cell handover, a cell can be selected from the CHO candidate cells. In this way, CHO can be triggered at the time of cell selection or cell handover, so the time for restoring the radio link can be greatly shortened.

CHO refers to that in the cell handover process of the UE, the UE is asked to select a target base station according to the measurement result, initiate a handover execution process, and initiate random access to the target cell. In this way, during the signaling interaction between the UE and the source base station and the signaling interaction between the source base station and the target base station, the UE handover failure caused by the change of the radio link state can be avoided. CHO plays an important role in reducing delays and interruptions and ensuring service continuity in user mobility. The UE can be configured with one or more CHO candidate cells, and when the target cell is the CHO candidate cell, the UE can trigger the CHO, thereby reducing the delay and interruption of handover.

According to an embodiment of the present disclosure, applying CHO to an IAB network, for example, a host node configures one or more CHO candidate cells for each IAB node. In this way, when the IAB node performs cell selection or cell handover, a cell can be selected from the configured CHO candidate cells. Furthermore, in the present disclosure, cells and IAB nodes are in one-to-one correspondence. That is to say, when the IAB node performs cell selection, it actually selects a suitable IAB node (including the host node) as the parent node and connects with the node. Similarly, when an IAB node performs cell handover, it actually selects a suitable IAB node (including the host node) as a parent node and switches from the source parent node to this node.

According to an embodiment of the present disclosure, as shown in FIG. 3 , the electronic device 300 may further include a determination unit 340 for determining whether to perform cell selection or cell handover.

According to an embodiment of the present disclosure, in the case that RLF occurs in the electronic device 300, the determination unit 340 determines that cell selection is required. Here, the electronic device 300 may determine the occurrence of RLF through any method known in the art, which is not limited in the present disclosure.

According to an embodiment of the present disclosure, when the determination unit 340 determines that RLF occurs in the electronic device 300 and thus needs to perform cell selection, the selection unit 310 may determine a priority list of candidate cells, where the priority list includes measurement results according to each candidate cell The priority of each candidate cell is determined.

Here, the candidate cells refer to one or more candidate cells when the electronic device 300 performs cell selection, for example, cells around the electronic device 300 that can measure signals by the electronic device 300 . Herein, since the electronic device 300 may be able to measure the signal of the donor node, the candidate cell may also include a cell corresponding to the donor node.

According to an embodiment of the present disclosure, as shown in FIG. 3 , the electronic device 300 may further include a measurement unit 350 for measuring the signals of each candidate cell. Preferably, this measurement process may be periodic. Here, the results measured by the measuring unit 350 include, but are not limited to, parameters indicating signal quality, such as RSRP, RSRQ, and the like.

According to an embodiment of the present disclosure, the selection unit 310 may determine a priority list according to the measurement results obtained by the measurement unit 350 measuring each candidate cell, so that the priority of the candidate cell with better measurement result (eg, higher RSRP value) is the priority list higher.

According to an embodiment of the present disclosure, the electronic device 300 may also send the measurement result to the host node through the communication unit 330 . In this way, the host node can predict the measurement results of each candidate cell in the next cycle according to the received historical measurement results of the electronic device 300 . Further, the electronic device 300 may receive, from the host node through the communication unit 330, the measurement results of each candidate cell in the next cycle predicted by the host node, so that the selection unit 310 may determine the priority list according to the received measurement results of each candidate cell, The priority of the candidate cell with better measurement result is higher.

Here, if all IAB nodes in the IAB network are fixed rather than mobile, the host node can predict the measurement results of each cell in the next period according to the historical measurement results of each cell, so that the measurement results in each cell are better. The cell is determined as a candidate cell. If the IAB node in the IAB network is movable, the host node can predict the location of each cell and the electronic device 300 in the next cycle according to the historical location of each cell and the electronic device 300, and then according to the historical measurement results of each cell, the The measurement results of each cell in one cycle and the position of the electronic device 300 are used to determine the measurement result of each cell in the next cycle, so that a cell with a better measurement result among the cells is determined as a candidate cell. That is, the donor node can predict candidate cells and measurement results of each candidate cell for the electronic device 300 .

Since each node in the IAB network may be in the process of moving, the change of position may lead to the change of the measurement result. As described above, according to an embodiment of the present disclosure, the electronic device 300 may determine the priority list according to the measurement result predicted by the host node. In this way, the priority list can be made more accurate, so that the electronic device 300 can select a cell with better signal quality.

According to an embodiment of the present disclosure, the selection unit 310 may modify the priority list so that the priority of the CHO candidate cell is higher than the priority of other candidate cells. Here, the selection unit 310 may determine which cells are CHO candidate cells according to the configuration information from the donor node, thereby modifying the priority list. Further, the selection unit 310 may select a cell according to the modified priority list.

According to an embodiment of the present disclosure, in the modified priority list, candidate cells are sorted according to signal quality, and the priority of CHO candidate cells is higher than that of other candidate cells. That is, the modified priority list consists of two parts: CHO candidate cells located in the first half of the list and non-CHO candidate cells located in the second half of the list. In the CHO candidate cell, the better the signal quality, the higher the priority. Likewise, in non-CHO candidate cells, the better the signal quality, the higher the priority.

According to an embodiment of the present disclosure, when selecting a cell from the modified priority list, the selection unit 310 may select the cell with the highest priority, that is, the CHO candidate cell with the best measurement result. In this way, the cell selected by the selection unit 310 is a CHO candidate cell, so that CHO is triggered, and the time for cell selection can be shortened.

According to an embodiment of the present disclosure, the selection unit 310 may also modify the priority list to delete descendant nodes of the electronic device 300 from the priority list. Preferably, the selection unit 310 may first delete the descendant nodes of the electronic device 300 from the priority list, and then reorder the priority list so that the priority of the CHO candidate cell is higher than that of other candidate cells.

According to an embodiment of the present disclosure, the electronic device 300 may transmit, through the communication unit 330, the first information indicating that the electronic device 300 is attempting to perform RLF recovery. For example, the electronic device 300 may send the first information through a Type 2 (Type 2) RLF notification (Trying to recover) using BAP signaling. The first information indicates that the electronic device 300 has detected that RLF has occurred on the backhaul link and that the electronic device 300 is attempting to recover.

According to an embodiment of the present disclosure, after receiving the first information, the child node of the electronic device 300 may forward the first information, so that the child nodes of the child node can also receive the first information, and so on. That is, through layer-by-layer forwarding, all descendant nodes of the electronic device 300 can receive the first information. Further, each node that receives the first information can send response information of the first information, including the identity of the node and the identity of descendant nodes of the node. In this way, the electronic device 300 may receive response information including the identification of the child node and the descendant nodes of the child node from each child node of the electronic device 300 . That is, by sending the response information layer by layer, the electronic device 300 can obtain the identifiers of all descendant nodes, so that descendant nodes of the electronic device 300 can be deleted from the priority list according to the identifiers of all descendant nodes included in the response information.

Taking the IAB network shown in FIG. 1 as an example, after the IAB node 3 generates RLF, the IAB node 3 can send the first information to the IAB node 4 , and the IAB node 4 can forward the first information to the IAB node 5 . The IAB node 5 sends response information to the IAB node 4, including the identifier of the IAB node 5, and the IAB node 4 can send the response information to the IAB node 3, including the identifier of the IAB node 4 and the identifier of the IAB node 5. In this way, IAB node 3 can obtain the identity of its descendant nodes, thereby removing IAB node 4 and IAB node 5 from the priority list.

In the IAB network, when the IAB node has RLF, its descendant nodes are also disconnected from the CN, so it is meaningless to select its descendant nodes when the IAB node performs cell selection. That is, an IAB node cannot reconnect to the CN through its descendant nodes. Therefore, according to the embodiments of the present disclosure, when performing cell selection, the electronic device 300 can delete descendant nodes from the priority list, thereby saving time for cell selection and further shortening the delay in cell selection.

4 is a signaling flow diagram illustrating the process of cell selection in the event of RLF at an IAB node according to an embodiment of the present disclosure. The IAB network structure shown in FIG. 2 is taken as an example, and the IAB node 3 may be implemented by the electronic device 300 . As shown in FIG. 4 , in step S401, the IAB node 3 measures the signals of the surrounding candidate cells. In step S402, the IAB node 3 sends a measurement report to the IAB host. In step S403, the IAB host predicts the measurement results of each candidate cell in the next cycle according to the received historical measurement report. In step S404, the IAB host sends the predicted measurement result to the IAB node 3. In step S405, the IAB node 3 stores the received predicted measurement result locally. Here, steps S401 to S405 may be performed periodically, so that the IAB node 3 can always store the latest predicted measurement results. In step S406, the IAB node 3 determines that RLF has occurred. In step S407, the IAB node 3 determines a priority list of candidate cells according to the stored predicted measurement results. Here, the order of each candidate cell in the priority list is determined according to the measurement result, so that a candidate cell with better signal quality has a higher priority. In step S408, the IAB node 3 sends the first information indicating that the IAB node 3 is trying to perform RLF recovery to the child node IAB node 4. In step S409, the IAB node 4 sends response information to the IAB node 3, including the identifiers of the IAB node 4 and the descendant nodes of the IAB node 4. Here, FIG. 4 only shows the situation that the IAB node 3 sends the first information to the IAB node 4, in fact, the IAB node 3 can send the first information to all child nodes. In step S410, the IAB node 3 determines the identifiers of all descendant nodes according to the response information from all child nodes, thereby deleting descendant nodes from the priority list. In step S411, the IAB node 3 modifies the priority list so that the priority of the CHO candidate cells is higher than the priority of the non-CHO candidate cells. In step S412, the IAB node 3 selects a cell according to the modified priority list, for example, selects the cell with the highest priority. Next, the IAB node 3 can connect to the selected cell. As described above, the IAB node 3 achieves RLF recovery through cell selection, thereby reconnecting to the CN.

As described above, the case where the electronic device 300 for the IAB node generates RLF and performs cell selection is described.

According to an embodiment of the present disclosure, the electronic device 300 may also perform cell selection in the case that RLF occurs on the parent node of the electronic device 300 and RLF recovery fails.

According to an embodiment of the present disclosure, when the electronic device 300 receives the second information from the parent node indicating that RLF occurs in the parent node and RLF recovery fails, the determining unit 340 may determine that the electronic device 300 declares RLF and the electronic device 300 needs to perform Cell selection. That is, when RLF occurs on the parent node of the electronic device 300 and RLF recovery fails, the electronic device 300 considers that its connection with the parent node has been disconnected and enters an idle/inactive state, so cell selection is required.

Here, the parent node of the electronic device 300 may send the second information through a Type 4 (Type 4) RLF notification (Recover failure) using BAP signaling. The second information indicates that the backhaul link RLF of the parent node of the electronic device 300 fails to recover.

In this case, the operation of the electronic device 300 for cell selection is similar to the operation in the case where RLF occurs and the electronic device 300 performs cell selection, and only different parts will be described below.

According to an embodiment of the present disclosure, the selection unit 310 may delete the parent node of the electronic device 300 from the priority list. That is, the selection unit 310 deletes the parent and descendant nodes of the electronic device 300 from the priority list, and then reorders the priority list so that the priority of the CHO candidate cells is higher than that of the non-CHO candidate cells.

According to an embodiment of the present disclosure, the second information sent by the parent node of the electronic device 300 may include the identifier of the parent node, so that the selection unit 310 may delete the parent node from the priority list according to the identifier of the parent node included in the second information .

In an IAB network, when the parent node of the IAB node has RLF and the recovery fails, it is meaningless to select its parent node again when the IAB node performs cell selection. That is, the IAB node cannot reconnect to the CN through its parent node that has failed to recover. Therefore, according to the embodiments of the present disclosure, when performing cell selection, the electronic device 300 can delete the parent node from the priority list, thereby saving time for cell selection and further shortening the delay in cell selection.

FIG. 5 is a signaling flow diagram illustrating a process of cell selection in the event that an RLF occurs at a parent node of an IAB node and RLF recovery fails, according to an embodiment of the present disclosure. The IAB network structure shown in FIG. 2 is taken as an example, and the IAB node 4 may be implemented by the electronic device 300 . As shown in FIG. 5, in step S501, the IAB node 4 measures the signals of the surrounding candidate cells. In step S502, the IAB node 4 sends a measurement report to the IAB host. In step S503, the IAB host predicts the measurement results of each candidate cell in the next cycle according to the received historical measurement report. In step S504, the IAB host sends the predicted measurement result to the IAB node 4. In step S505, the IAB node 4 stores the received predicted measurement result locally. Here, steps S501 to S505 may be performed periodically, so that the IAB node 4 can always store the latest predicted measurement results. In step S506, the IAB node 4 receives from the IAB node 3 second information indicating that the IAB node 3 has RLF and the RLF recovery has failed. In step S507, the IAB node 4 determines a priority list of candidate cells according to the stored predicted measurement results. Here, the order of each candidate cell in the priority list is determined according to the measurement result, so that a candidate cell with better signal quality has a higher priority. In step S508, the IAB node 4 sends the first information indicating that the IAB node 4 is trying to perform RLF recovery to the child node IAB node 5. In step S509, the IAB node 5 sends response information to the IAB node 4, including the identifiers of the IAB node 5 and the descendant nodes of the IAB node 5. Here, FIG. 5 only shows the situation that the IAB node 4 sends the first information to the IAB node 5, in fact, the IAB node 4 can send the first information to all child nodes. In step S510, the IAB node 4 determines the identifiers of all descendant nodes according to the response information from all the child nodes, so as to delete the descendant nodes from the priority list, and delete the parent node, that is, the IAB node 3. In step S511, the IAB node 4 modifies the priority list so that the priority of the CHO candidate cells is higher than the priority of the non-CHO candidate cells. In step S512, the IAB node 4 selects a cell according to the modified priority list, for example, selects the cell with the highest priority. Next, the IAB node 4 can connect to the selected cell. As described above, the IAB node 4 reconnects to the CN through cell selection.

As described above, the situation in which the parent node of the electronic device 300 has RLF and the recovery fails and the electronic device 300 performs cell selection is described.

Another operation of the electronic device 300 in the case where RLF occurs at the parent node of the electronic device 300 and recovery fails will be described below.

According to an embodiment of the present disclosure, the determining unit 340 may determine the electronic device under the condition that both the condition of the first event indicating that the parent node of the electronic device 300 occurs and RLF recovery fails and the condition of the second event indicating the cell handover are satisfied 300 performs cell handover.

According to an embodiment of the present disclosure, the determining unit 340 may determine that the condition of the first event is satisfied in the case of receiving the second information from the parent node of the electronic device 300 indicating that the parent node has RLF and RLF recovery failed. That is, in the case where RLF occurs on the parent node of the electronic device 300 and RLF recovery fails, the determining unit 340 may determine that the electronic device 300 does not declare RLF, that is, does not consider the electronic device 300 to be disconnected from the parent node. That is, the electronic device 300 knows that the backhaul link of the parent node has been disconnected but still maintains the backhaul link of the electronic device 300 . In this case, the electronic device 300 may continue to monitor whether the conditions of the second event are satisfied.

According to an embodiment of the present disclosure, the host node may configure the electronic device 300 with a parameter for the first event, for example, represented by ConRlfFlag, and the initial value of the parameter is 0. When the electronic device 300 receives the second information from the parent node indicating that RLF occurs at the parent node and RLF recovery fails, the electronic device 300 may modify the parameter ConRlfFlag of the first event to 1. Here, the electronic device 300 may set the threshold of the parameter of the first event, and when the parameter of the first event is greater than the threshold, the determining unit 340 may determine that the condition of the first event is satisfied; when the parameter of the first event is not greater than the threshold, determine Unit 340 may determine that the conditions of the first event are not satisfied. Here, the threshold value of the parameter of the first event may be between 0 and 1. According to an embodiment of the present disclosure, after the electronic device 300 switches to a new cell, the electronic device 300 may reset the parameter ConRlfFlag of the first event to 0.

According to an embodiment of the present disclosure, the measurement unit 350 may measure the signals of all CHO candidate cells of the electronic device 300 . Further, in the case where the measurement result of the current cell is less than the first threshold and the measurement result of the CHO candidate cell is greater than the second threshold and continues for a predetermined time, it is determined that the condition of the second event is satisfied, and the selection unit 310 may determine that the condition is satisfied. The CHO candidate cell of the condition of the second event is the cell to be selected.

Here, when the measurement result of the current cell is less than the first threshold and the measurement result of the CHO candidate cell is greater than the second threshold, the determining unit 340 may consider that the entry condition of the second event is satisfied, and the above situation continues for a predetermined time TTT (Time To Trigger, trigger duration), the determining unit 340 may determine that the condition of the second event is satisfied.

Here, the second event may be an A5 event, and the entry conditions and exit conditions of the second event may adopt the known entry conditions and exit conditions of the A5 event, as shown below:

Entry condition 1: Mp+Hys<Thresh1

Entry condition 2: Mn+Ofn+Ocn–Hys>Thresh2

Leave Condition 1: Mp–Hys>Thresh1

Exit condition 2: Mn+Ofn+Ocn+Hys<Thresh2

Among them, Mp represents the measurement result of the current cell, Mn represents the measurement result of the CHO candidate cell, Ofn represents the frequency-specific offset of the frequency of the CHO cell, Ocn represents the cell-specific offset of the CHO candidate cell, Hys represents the hysteresis parameter, and Thresh1 represents the first A threshold, Thresh2 represents the second threshold. When the entry condition 1 and the entry condition 2 are satisfied at the same time, it is determined that the entry condition of the A5 event is satisfied, and when the exit condition 1 or the exit condition 2 is satisfied, it is determined that the exit condition of the A5 event is satisfied.

That is, in the case where (the measurement result of the current cell + hysteresis parameter) is less than the first threshold and (the measurement result of the CHO candidate cell + frequency-specific offset + cell-specific offset - hysteresis parameter) is greater than the second threshold, determine Unit 340 may consider that the entry condition of the second event is satisfied.

According to an embodiment of the present disclosure, the first threshold is greater than the second threshold. In this way, the measurement result of the current cell may be larger than the measurement result of the CHO candidate cell, but the measurement result of the current cell is smaller than the first threshold and the measurement result of the CHO candidate cell is larger than the second threshold. That is to say, even if the signal quality of the CHO candidate cell is worse than that of the current cell, the entry condition of the second event may be satisfied, so that in the case that the parent node of the electronic device 300 has RLF and the recovery fails, even if the CHO If the signal quality of the candidate cell is worse than that of the current cell, the CHO can also be triggered, thereby increasing the possibility of the electronic device 300 switching to the CHO candidate cell.

According to an embodiment of the present disclosure, when the condition of the first event is satisfied, the selection unit 310 may delete the parent node and descendant node of the electronic device 300 from the CHO candidate cell.

According to an embodiment of the present disclosure, the electronic device 300 can obtain the identifiers of all descendant nodes in the manner described above to delete descendant nodes. For example, when the conditions of the first event are satisfied, the electronic device 300 may send the first information indicating that the electronic device 300 is attempting to perform RLF recovery through the communication unit 330, and receive the information from each child node of the electronic device 300 including the child node and the child node. and the descendant node of the electronic device 300 is deleted from the CHO candidate cell according to the response information. For example, the electronic device 300 may acquire the identity of the parent node through the second information, so as to delete the parent node from the CHO candidate cell.

In the IAB network, when the parent node of the IAB node has RLF and the recovery fails, it is meaningless to select its descendant node and parent node when the IAB node performs cell handover. That is, an IAB node cannot reconnect to the CN through its descendant or parent node. Therefore, according to the embodiments of the present disclosure, during cell handover, the electronic device 300 can delete descendant nodes and parent nodes from the CHO candidate cell list, thereby saving measurement time and further shortening the cell handover delay.

FIG. 6 is a signaling flow diagram illustrating a process of cell handover in the event that an RLF occurs in a parent node of an IAB node and RLF recovery fails, according to an embodiment of the present disclosure. The IAB network structure shown in FIG. 2 is taken as an example, and the IAB node 4 may be implemented by the electronic device 300 . As shown in FIG. 6 , in step S601, the IAB node 3 sends second information to the IAB node 4 indicating that the IAB node 3 has RLF and the RLF recovery fails, and in step S602, the IAB node 4 determines that the conditions of the first event are satisfied. In step S603, the IAB node 4 sends to the IAB node 5 the first information indicating that the IAB node 4 is trying to perform RLF recovery. In step S604, the IAB node 5 sends response information to the IAB node 4, including the identifiers of the IAB node 5 and descendant nodes. In step S605, IAB node 4 deletes its descendant node and parent node IAB node 3 from the CHO candidate cell. In step S606, the IAB node 4 measures the CHO candidate cell to determine that the conditions of the second event are satisfied. In step S607, the IAB node 4 switches to the CHO candidate cell that satisfies the conditions of the second event. As described above, the IAB node 4 reconnects to the CN through cell handover.

FIG. 7 is a schematic diagram illustrating the setting of execution conditions of cell handover according to an embodiment of the present disclosure. As shown in FIG. 7 , ConRlfFlag represents the parameter of the first event, and at time T1, the parameter of the first event becomes larger than the threshold value of the parameter of the first event, so that the condition of the first event is satisfied. At time T2, assuming that the entry condition of the second event is satisfied, that is, the measurement result of the CHO candidate cell minus the hysteresis parameter is greater than the second threshold of the second event, then at time T3 (the time TTT elapses after time T2), determine the first The conditions for the second event are satisfied. That is, at time T3, it can be determined that the condition of the first event is satisfied, and the entry condition of the second event is satisfied and lasts longer than the TTT time, that is, cell handover can be performed.

As described above, the situation in which the parent node of the electronic device 300 occurs RLF and the recovery fails and the electronic device 300 performs cell handover is described.

It can be seen that, according to the embodiments of the present disclosure, when the IAB node performs cell selection or cell handover, a cell can be selected from the CHO candidate cells. In this way, CHO can be triggered at the time of cell selection or cell handover, so the time for restoring the radio link can be greatly shortened. Specifically, in the case that the RLF occurs in the IAB node, the IAB node can perform cell selection. Further, the IAB node can increase the priority of the CHO candidate cell to select the CHO cell. In addition, the IAB node can avoid selecting its child nodes to further save time in cell selection. In the case that the parent node of the IAB node has RLF and the recovery fails, the IAB node can also perform cell selection. Likewise, the IAB node may increase the priority of the CHO candidate cell to select the CHO cell. In addition, the IAB node can avoid selecting its child nodes and parent nodes to further save the time of cell selection. In the case that the parent node of the IAB node has RLF and the recovery fails, the IAB node can monitor whether the conditions of the second event representing the cell handover are satisfied to perform the cell handover. Similarly, in the process of cell handover, the IAB node can also avoid selecting its child node and parent node to further save the time of cell handover. In conclusion, according to the embodiments of the present disclosure, CHO can be forcibly triggered during cell selection or cell handover, so the time for restoring the radio link can be greatly shortened in the IAB network.

<3. Method Example>

Next, a wireless communication method performed by the electronic device 300 for an IAB node in a wireless communication system according to an embodiment of the present disclosure will be described in detail.

FIG. 8 is a flowchart illustrating a wireless communication method performed by an electronic device 300 for an IAB node in a wireless communication system according to an embodiment of the present disclosure.

As shown in FIG. 8 , in step S810 , when performing cell selection or cell handover, a cell is selected from the conditional handover CHO candidate cells of the electronic device 300 .

Next, in step S820, connect to the IAB node corresponding to the selected cell.

Preferably, the wireless communication method further includes: performing cell selection when RLF occurs in the electronic device 300, or when RLF occurs on a parent node of the electronic device 300 and RLF recovery fails.

Preferably, selecting a cell from the conditional handover CHO candidate cells of the electronic device 300 includes: determining a priority list of the candidate cells, where the priority list includes the priority of each candidate cell determined according to the measurement results of each candidate cell; modifying the priority a priority list, so that the priority of the CHO candidate cell is higher than the priority of other candidate cells; and the cell is selected according to the modified priority list.

Preferably, the wireless communication method further comprises: periodically measuring signals from each candidate cell and sending the measurement results to the IAB donor; and receiving from the IAB donor the measurement results of each candidate cell in the next period predicted by the IAB donor.

Preferably, the wireless communication method further comprises: deleting descendant nodes of the electronic device 300 from the priority list.

Preferably, the wireless communication method further includes: sending first information indicating that the electronic device 300 is trying to perform RLF recovery; receiving response information including the identification of the child node and the descendant nodes of the child node from each child node of the electronic device 300; and according to the response The message deletes descendant nodes of electronic device 300 from the priority list.

Preferably, the wireless communication method further includes: deleting the parent node of the electronic device 300 from the priority list in the case that the parent node of the electronic device 300 has RLF and RLF recovery fails.

Preferably, the wireless communication method further includes: performing cell handover when both conditions of the first event indicating that the parent node of the electronic device 300 has RLF and RLF recovery failure and the conditions of the second event indicating cell handover are satisfied.

Preferably, the wireless communication method further comprises: in the case of receiving second information from the parent node of the electronic device 300 indicating that the parent node has RLF and RLF recovery failed, determining that the condition of the first event is satisfied.

Preferably, the wireless communication method further comprises: in the case where the measurement result of the current cell is smaller than the first threshold and the measurement result of the CHO candidate cell is larger than the second threshold for a predetermined time, determining that the condition of the second event is satisfied, and wherein , the first threshold is greater than the second threshold.

Preferably, the wireless communication method further includes: deleting the parent node and descendant node of the electronic device 300 from the CHO candidate cell.

Preferably, the wireless communication method further includes: sending first information indicating that the electronic device 300 is trying to perform RLF recovery; receiving response information including the identification of the child node and the descendant nodes of the child node from each child node of the electronic device 300; and according to the response The information deletes descendant nodes of the electronic device 300 from the CHO candidate cell.

According to an embodiment of the present disclosure, the subject performing the above method may be the electronic device 300 according to the embodiment of the present disclosure, so all the foregoing embodiments about the electronic device 300 are applicable to this.

<4. Application example>

The techniques of this disclosure can be applied to various products.

For example, the network side equipment can also be implemented as any type of base station equipment, such as macro eNB and small eNB, and can also be implemented as any type of gNB (base station in a 5G system). Small eNBs may be eNBs covering cells smaller than macro cells, such as pico eNBs, micro eNBs, and home (femto) eNBs. Alternatively, the base station may be implemented as any other type of base station, such as NodeB and base transceiver station (BTS). A base station may include: a subject (also referred to as base station equipment) configured to control wireless communications; and one or more remote radio heads (RRHs) located at a different location than the subject.

User equipment may be implemented as mobile terminals such as smart phones, tablet personal computers (PCs), notebook PCs, portable game terminals, portable/dongle-type mobile routers, and digital cameras or vehicle-mounted terminals such as car navigation devices. The user equipment may also be implemented as a terminal performing machine-to-machine (M2M) communication (also referred to as a machine type communication (MTC) terminal). Furthermore, the user equipment may be a wireless communication module (such as an integrated circuit module comprising a single die) mounted on each of the above-mentioned user equipments.

(First application example)

9 is a block diagram illustrating a first example of a schematic configuration of an eNB to which techniques of the present disclosure may be applied. eNB 900 includes one or more antennas 910 and base station equipment 920. The base station apparatus 920 and each antenna 910 may be connected to each other via an RF cable.

Each of the antennas 910 includes a single or multiple antenna elements (such as multiple antenna elements included in a multiple-input multiple-output (MIMO) antenna), and is used for the base station apparatus 920 to transmit and receive wireless signals. As shown in FIG. 9, eNB 900 may include multiple antennas 910. For example, multiple antennas 910 may be compatible with multiple frequency bands used by eNB 900. Although FIG. 9 shows an example in which the eNB 900 includes multiple antennas 910, the eNB 900 may also include a single antenna 910.

The base station apparatus 920 includes a controller 921 , a memory 922 , a network interface 923 , and a wireless communication interface 925 .

The controller 921 may be, for example, a CPU or a DSP, and operates various functions of a higher layer of the base station apparatus 920 . For example, the controller 921 generates data packets from the data in the signal processed by the wireless communication interface 925 and communicates the generated packets via the network interface 923 . The controller 921 may bundle data from a plurality of baseband processors to generate a bundled packet, and deliver the generated bundled packet. The controller 921 may have logical functions to perform controls such as radio resource control, radio bearer control, mobility management, admission control and scheduling. This control may be performed in conjunction with nearby eNB or core network nodes. The memory 922 includes RAM and ROM, and stores programs executed by the controller 921 and various types of control data such as a terminal list, transmission power data, and scheduling data.

The network interface 923 is a communication interface for connecting the base station apparatus 920 to the core network 924 . Controller 921 may communicate with core network nodes or further eNBs via network interface 923. In this case, the eNB 900 and core network nodes or other eNBs may be connected to each other through logical interfaces such as S1 interface and X2 interface. The network interface 923 may also be a wired communication interface or a wireless communication interface for wireless backhaul. If the network interface 923 is a wireless communication interface, the network interface 923 may use a higher frequency band for wireless communication than the frequency band used by the wireless communication interface 925 .

Wireless communication interface 925 supports any cellular communication scheme, such as Long Term Evolution (LTE) and LTE-Advanced, and provides wireless connectivity to terminals located in cells of eNB 900 via antenna 910. Wireless communication interface 925 may generally include, for example, a baseband (BB) processor 926 and RF circuitry 927 . The BB processor 926 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs layers such as L1, Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol ( PDCP)) various types of signal processing. In place of the controller 921, the BB processor 926 may have some or all of the above-described logical functions. The BB processor 926 may be a memory storing a communication control program, or a module including a processor and associated circuitry configured to execute the program. The update procedure may cause the functionality of the BB processor 926 to change. The module may be a card or blade that is inserted into a slot of the base station device 920 . Alternatively, the module can also be a chip mounted on a card or blade. Meanwhile, the RF circuit 927 may include, for example, a mixer, a filter, and an amplifier, and transmit and receive wireless signals via the antenna 910 .

As shown in FIG. 9 , the wireless communication interface 925 may include multiple BB processors 926 . For example, multiple BB processors 926 may be compatible with multiple frequency bands used by eNB 900. As shown in FIG. 9 , the wireless communication interface 925 may include a plurality of RF circuits 927 . For example, multiple RF circuits 927 may be compatible with multiple antenna elements. Although FIG. 9 shows an example in which the wireless communication interface 925 includes multiple BB processors 926 and multiple RF circuits 927 , the wireless communication interface 925 may also include a single BB processor 926 or a single RF circuit 927 .

(Second application example)

10 is a block diagram illustrating a second example of a schematic configuration of an eNB to which techniques of the present disclosure may be applied. eNB 1030 includes one or more antennas 1040, base station equipment 1050, and RRH 1060. The RRH 1060 and each antenna 1040 may be connected to each other via an RF cable. The base station apparatus 1050 and the RRH 1060 may be connected to each other via high-speed lines such as fiber optic cables.

Each of the antennas 1040 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna) and is used by the RRH 1060 to transmit and receive wireless signals. As shown in FIG. 10, the eNB 1030 may include multiple antennas 1040. For example, multiple antennas 1040 may be compatible with multiple frequency bands used by eNB 1030. 10 shows an example in which the eNB 1030 includes multiple antennas 1040, the eNB 1030 may also include a single antenna 1040.

The base station apparatus 1050 includes a controller 1051 , a memory 1052 , a network interface 1053 , a wireless communication interface 1055 , and a connection interface 1057 . The controller 1051 , the memory 1052 and the network interface 1053 are the same as the controller 921 , the memory 922 and the network interface 923 described with reference to FIG. 9 . The network interface 1053 is a communication interface for connecting the base station apparatus 1050 to the core network 1054 .

Wireless communication interface 1055 supports any cellular communication scheme, such as LTE and LTE-Advanced, and provides wireless communication via RRH 1060 and antenna 1040 to terminals located in a sector corresponding to RRH 1060. Wireless communication interface 1055 may generally include, for example, BB processor 1056 . The BB processor 1056 is the same as the BB processor 926 described with reference to FIG. 9, except that the BB processor 1056 is connected to the RF circuit 1064 of the RRH 1060 via the connection interface 1057. As shown in FIG. 10 , the wireless communication interface 1055 may include multiple BB processors 1056 . For example, multiple BB processors 1056 may be compatible with multiple frequency bands used by eNB 1030. Although FIG. 10 shows an example in which the wireless communication interface 1055 includes multiple BB processors 1056 , the wireless communication interface 1055 may also include a single BB processor 1056 .

The connection interface 1057 is an interface for connecting the base station apparatus 1050 (the wireless communication interface 1055) to the RRH 1060. The connection interface 1057 may also be a communication module for communication in the above-mentioned high-speed line connecting the base station device 1050 (the wireless communication interface 1055) to the RRH 1060.

RRH 1060 includes connection interface 1061 and wireless communication interface 1063.

The connection interface 1061 is an interface for connecting the RRH 1060 (the wireless communication interface 1063) to the base station apparatus 1050. The connection interface 1061 may also be a communication module used for communication in the above-mentioned high-speed line.

The wireless communication interface 1063 transmits and receives wireless signals via the antenna 1040 . Wireless communication interface 1063 may typically include RF circuitry 1064, for example. RF circuitry 1064 may include, for example, mixers, filters, and amplifiers, and transmit and receive wireless signals via antenna 1040 . As shown in FIG. 10 , the wireless communication interface 1063 may include a plurality of RF circuits 1064 . For example, multiple RF circuits 1064 may support multiple antenna elements. Although FIG. 10 shows an example in which the wireless communication interface 1063 includes multiple RF circuits 1064 , the wireless communication interface 1063 may also include a single RF circuit 1064 .

(First application example)

FIG. 11 is a block diagram showing an example of a schematic configuration of a smartphone 1100 to which the techniques of the present disclosure can be applied. The smartphone 1100 includes a processor 1101, a memory 1102, a storage device 1103, an external connection interface 1104, a camera 1106, a sensor 1107, a microphone 1108, an input device 1109, a display device 1110, a speaker 1111, a wireless communication interface 1112, one or more Antenna switch 1115 , one or more antennas 1116 , bus 1117 , battery 1118 , and auxiliary controller 1119 .

The processor 1101 may be, for example, a CPU or a system on a chip (SoC), and controls the functions of the application layer and further layers of the smartphone 1100 . The memory 1102 includes RAM and ROM, and stores data and programs executed by the processor 1101 . The storage device 1103 may include storage media such as semiconductor memories and hard disks. The external connection interface 1104 is an interface for connecting an external device such as a memory card and a Universal Serial Bus (USB) device to the smartphone 1100 .

The camera 1106 includes an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image. Sensors 1107 may include a set of sensors, such as measurement sensors, gyroscope sensors, geomagnetic sensors, and acceleration sensors. The microphone 1108 converts the sound input to the smartphone 1100 into an audio signal. The input device 1109 includes, for example, a touch sensor, a keypad, a keyboard, buttons, or switches configured to detect a touch on the screen of the display device 1110, and receives operations or information input from a user. The display device 1110 includes a screen such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) display, and displays an output image of the smartphone 1100 . The speaker 1111 converts the audio signal output from the smartphone 1100 into sound.

The wireless communication interface 1112 supports any cellular communication scheme, such as LTE and LTE-Advanced, and performs wireless communication. Wireless communication interface 1112 may typically include, for example, BB processor 1113 and RF circuitry 1114. The BB processor 1113 can perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication. Meanwhile, the RF circuit 1114 may include, for example, mixers, filters, and amplifiers, and transmit and receive wireless signals via the antenna 1116 . The wireless communication interface 1112 may be a chip module on which the BB processor 1113 and the RF circuit 1114 are integrated. As shown in FIG. 11 , the wireless communication interface 1112 may include multiple BB processors 1113 and multiple RF circuits 1114 . Although FIG. 11 shows an example in which the wireless communication interface 1112 includes multiple BB processors 1113 and multiple RF circuits 1114 , the wireless communication interface 1112 may include a single BB processor 1113 or a single RF circuit 1114 .

Furthermore, in addition to cellular communication schemes, the wireless communication interface 1112 may support additional types of wireless communication schemes, such as short-range wireless communication schemes, near field communication schemes, and wireless local area network (LAN) schemes. In this case, the wireless communication interface 1112 may include a BB processor 1113 and an RF circuit 1114 for each wireless communication scheme.

Each of the antenna switches 1115 switches the connection destination of the antenna 1116 among a plurality of circuits included in the wireless communication interface 1112 (eg, circuits for different wireless communication schemes).

Each of the antennas 1116 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna), and is used for the wireless communication interface 1112 to transmit and receive wireless signals. As shown in FIG. 11 , smartphone 1100 may include multiple antennas 1116 . Although FIG. 11 shows an example in which the smartphone 1100 includes multiple antennas 1116 , the smartphone 1100 may also include a single antenna 1116 .

Additionally, the smartphone 1100 may include an antenna 1116 for each wireless communication scheme. In this case, the antenna switch 1115 can be omitted from the configuration of the smartphone 1100 .

The bus 1117 connects the processor 1101, the memory 1102, the storage device 1103, the external connection interface 1104, the camera device 1106, the sensor 1107, the microphone 1108, the input device 1109, the display device 1110, the speaker 1111, the wireless communication interface 1112, and the auxiliary controller 1119 to each other connect. The battery 1118 provides power to the various blocks of the smartphone 1100 shown in FIG. 11 via feeders, which are partially shown in phantom in the figure. The auxiliary controller 1119 operates the minimum necessary functions of the smartphone 1100, eg, in a sleep mode.

(Second application example)

FIG. 12 is a block diagram showing an example of a schematic configuration of a car navigation apparatus 1220 to which the technology of the present disclosure can be applied. The car navigation device 1220 includes a processor 1221, a memory 1222, a global positioning system (GPS) module 1224, a sensor 1225, a data interface 1226, a content player 1227, a storage medium interface 1228, an input device 1229, a display device 1230, a speaker 1231, a wireless A communication interface 1233 , one or more antenna switches 1236 , one or more antennas 1237 , and a battery 1238 .

The processor 1221 may be, for example, a CPU or a SoC, and controls the navigation function and other functions of the car navigation device 1220 . The memory 1222 includes RAM and ROM, and stores data and programs executed by the processor 1221 .

The GPS module 1224 measures the position (such as latitude, longitude, and altitude) of the car navigation device 1220 using GPS signals received from GPS satellites. Sensors 1225 may include a set of sensors such as gyroscope sensors, geomagnetic sensors, and air pressure sensors. The data interface 1226 is connected to, for example, the in-vehicle network 1241 via a terminal not shown, and acquires data generated by the vehicle, such as vehicle speed data.

The content player 1227 reproduces content stored in storage media such as CDs and DVDs, which are inserted into the storage media interface 1228 . The input device 1229 includes, for example, a touch sensor, a button, or a switch configured to detect a touch on the screen of the display device 1230, and receives an operation or information input from a user. The display device 1230 includes a screen such as an LCD or OLED display, and displays images or reproduced content of a navigation function. The speaker 1231 outputs the sound of the navigation function or the reproduced content.

The wireless communication interface 1233 supports any cellular communication scheme such as LTE and LTE-Advanced, and performs wireless communication. Wireless communication interface 1233 may generally include, for example, BB processor 1234 and RF circuitry 1235. The BB processor 1234 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and perform various types of signal processing for wireless communication. Meanwhile, the RF circuit 1235 may include, for example, mixers, filters, and amplifiers, and transmit and receive wireless signals via the antenna 1237 . The wireless communication interface 1233 can also be a chip module on which the BB processor 1234 and the RF circuit 1235 are integrated. As shown in FIG. 12 , the wireless communication interface 1233 may include a plurality of BB processors 1234 and a plurality of RF circuits 1235 . Although FIG. 12 shows an example in which the wireless communication interface 1233 includes multiple BB processors 1234 and multiple RF circuits 1235 , the wireless communication interface 1233 may include a single BB processor 1234 or a single RF circuit 1235 .

Also, in addition to the cellular communication scheme, the wireless communication interface 1233 may support another type of wireless communication scheme, such as a short-range wireless communication scheme, a near field communication scheme, and a wireless LAN scheme. In this case, the wireless communication interface 1233 may include the BB processor 1234 and the RF circuit 1235 for each wireless communication scheme.

Each of the antenna switches 1236 switches the connection destination of the antenna 1237 among a plurality of circuits included in the wireless communication interface 1233, such as circuits for different wireless communication schemes.

Each of the antennas 1237 includes a single or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna), and is used for the wireless communication interface 1233 to transmit and receive wireless signals. As shown in FIG. 12 , the car navigation device 1220 may include a plurality of antennas 1237 . Although FIG. 12 shows an example in which the car navigation device 1220 includes multiple antennas 1237 , the car navigation device 1220 may also include a single antenna 1237 .

Also, the car navigation device 1220 may include an antenna 2137 for each wireless communication scheme. In this case, the antenna switch 1236 may be omitted from the configuration of the car navigation device 1220 .

The battery 1238 provides power to the various blocks of the car navigation device 1220 shown in FIG. 12 via feeders, which are partially shown as dashed lines in the figure. The battery 1238 accumulates power supplied from the vehicle.

The techniques of this disclosure may also be implemented as an in-vehicle system (or vehicle) 1240 that includes one or more blocks of a car navigation device 1220 , an in-vehicle network 1241 , and a vehicle module 1242 . The vehicle module 1242 generates vehicle data such as vehicle speed, engine speed, and fault information, and outputs the generated data to the in-vehicle network 1241 .

The preferred embodiments of the present disclosure have been described above with reference to the accompanying drawings, but the present disclosure is not limited to the above examples, of course. Those skilled in the art may find various changes and modifications within the scope of the appended claims, and it should be understood that they will naturally come under the technical scope of the present disclosure.

For example, the units shown in dotted boxes in the functional block diagram shown in the drawings all indicate that the functional units are optional in the corresponding device, and each optional functional unit can be combined in an appropriate manner to achieve the required functions .

For example, a plurality of functions included in one unit in the above embodiments may be implemented by separate devices. Alternatively, multiple functions implemented by multiple units in the above embodiments may be implemented by separate devices, respectively. Additionally, one of the above functions may be implemented by multiple units. Needless to say, such a configuration is included in the technical scope of the present disclosure.

In this specification, the steps described in the flowcharts include not only processing performed in time series in the stated order, but also processing performed in parallel or individually rather than necessarily in time series. Furthermore, even in the steps processed in time series, needless to say, the order can be appropriately changed.

Although the embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, it should be understood that the above-described embodiments are only used to illustrate the present disclosure, but not to limit the present disclosure. Various modifications and variations of the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the present disclosure. Accordingly, the scope of the present disclosure is to be limited only by the appended claims and their equivalents.

Claims

An electronic device for integrated access and backhaul IAB nodes, including processing circuitry, configured to:

When performing cell selection or cell handover, selecting a cell from the conditional handover CHO candidate cells of the electronic device; and

Connect to the IAB node corresponding to the selected cell.
The electronic device of claim 1, wherein the processing circuit is further configured to:

Cell selection is performed in the case of a radio link failure RLF of the electronic device, or in the case of an RLF of the parent node of the electronic device and RLF recovery failure.
The electronic device of claim 2, wherein the processing circuit is further configured to:

determining a priority list of candidate cells, where the priority list includes the priorities of each candidate cell determined according to the measurement results of each candidate cell;

modifying the priority list such that the priority of the CHO candidate cell is higher than the priority of other candidate cells; and

Cells are selected according to the modified priority list.
The electronic device of claim 3, wherein the processing circuit is further configured to:

Periodically measure the signals from each candidate cell and send the measurement results to the IAB host; and

The measurement results of each candidate cell for the next period predicted by the IAB host are received from the IAB host.
The electronic device of claim 3, wherein the processing circuit is further configured to:

Descendant nodes of the electronic device are deleted from the priority list.
The electronic device of claim 5, wherein the processing circuit is further configured to:

sending first information indicating that the electronic device is attempting RLF recovery;

receiving, from each child node of the electronic device, response information including the identification of the child node and descendant nodes of the child node; and

The descendant nodes of the electronic device are deleted from the priority list according to the response information.
The electronic device of claim 3, wherein the processing circuit is further configured to:

In the case that RLF occurs on the parent node of the electronic device and RLF recovery fails, the parent node of the electronic device is deleted from the priority list.
The electronic device of claim 1, wherein the processing circuit is further configured to:

Cell handover is performed when both the conditions of the first event indicating that the parent node of the electronic device has RLF and RLF recovery fails and the conditions of the second event indicating cell handover are satisfied.
The electronic device of claim 8, wherein the processing circuit is further configured to:

In the case of receiving second information from the parent node of the electronic device indicating that RLF occurred at the parent node and RLF recovery failed, it is determined that the condition of the first event is satisfied.
The electronic device of claim 8, wherein the processing circuit is further configured to:

In the case where the measurement result of the current cell is smaller than the first threshold and the measurement result of the CHO candidate cell is larger than the second threshold for a predetermined time, it is determined that the condition of the second event is satisfied, and

Wherein, the first threshold is greater than the second threshold.
The electronic device of claim 8, wherein the processing circuit is further configured to:

The parent node and descendant node of the electronic device are deleted from the CHO candidate cell.
The electronic device of claim 11, wherein the processing circuit is further configured to:

sending first information indicating that the electronic device is attempting RLF recovery;

receiving, from each child node of the electronic device, response information including the identification of the child node and descendant nodes of the child node; and

The descendant node of the electronic device is deleted from the CHO candidate cell according to the response information.
A wireless communication method performed by an electronic device for integrated access and backhaul IAB nodes, comprising:

When performing cell selection or cell handover, selecting a cell from the conditional handover CHO candidate cells of the electronic device; and

Connect to the IAB node corresponding to the selected cell.
The wireless communication method according to claim 13, wherein the wireless communication method further comprises:

Cell selection is performed in the case of a radio link failure RLF of the electronic device, or in the case of an RLF of the parent node of the electronic device and RLF recovery failure.
The wireless communication method of claim 14, wherein selecting a cell from the conditional handover CHO candidate cells of the electronic device comprises:

determining a priority list of candidate cells, where the priority list includes the priorities of each candidate cell determined according to the measurement results of each candidate cell;

modifying the priority list such that the priority of the CHO candidate cell is higher than the priority of other candidate cells; and

Cells are selected according to the modified priority list.
The wireless communication method according to claim 15, wherein the wireless communication method further comprises:

Periodically measure the signals from each candidate cell and send the measurement results to the IAB host; and

The measurement results of each candidate cell for the next period predicted by the IAB host are received from the IAB host.
The wireless communication method according to claim 15, wherein the wireless communication method further comprises:

Descendant nodes of the electronic device are deleted from the priority list.
The wireless communication method of claim 17, wherein the wireless communication method further comprises:

sending first information indicating that the electronic device is attempting RLF recovery;

receiving, from each child node of the electronic device, response information including the identification of the child node and descendant nodes of the child node; and

The descendant nodes of the electronic device are deleted from the priority list according to the response information.
The wireless communication method according to claim 15, wherein the wireless communication method further comprises:

In the case that RLF occurs on the parent node of the electronic device and RLF recovery fails, the parent node of the electronic device is deleted from the priority list.
The wireless communication method according to claim 13, wherein the wireless communication method further comprises:

Cell handover is performed when both the conditions of the first event indicating that the parent node of the electronic device has RLF and RLF recovery fails and the conditions of the second event indicating cell handover are satisfied.
The wireless communication method according to claim 20, wherein the wireless communication method further comprises:

In the case of receiving second information from the parent node of the electronic device indicating that RLF occurred at the parent node and RLF recovery failed, it is determined that the condition of the first event is satisfied.
The wireless communication method according to claim 20, wherein the wireless communication method further comprises:

In the case where the measurement result of the current cell is smaller than the first threshold and the measurement result of the CHO candidate cell is larger than the second threshold for a predetermined time, it is determined that the condition of the second event is satisfied, and

Wherein, the first threshold is greater than the second threshold.
The wireless communication method according to claim 20, wherein the wireless communication method further comprises:

The parent node and descendant node of the electronic device are deleted from the CHO candidate cell.
The wireless communication method according to claim 23, wherein the wireless communication method further comprises:

sending first information indicating that the electronic device is attempting RLF recovery;

receiving, from each child node of the electronic device, response information including the identification of the child node and descendant nodes of the child node; and

The descendant node of the electronic device is deleted from the CHO candidate cell according to the response information.
A computer-readable storage medium comprising executable computer instructions that, when executed by a computer, cause the computer to perform the wireless communication method of any of claims 13-24.