CN115967983A

CN115967983A - Message transmission method and device for rerouting indication

Info

Publication number: CN115967983A
Application number: CN202111178368.3A
Authority: CN
Inventors: 文鸣
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2023-04-14
Also published as: WO2023056941A1

Abstract

The embodiment of the application discloses a message transmission method and device for rerouting indication, and belongs to the technical field of communication. The message transmission method for rerouting indication in the embodiment of the application includes: the first IAB node receives at least one of: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the first IAB node to carry out rerouting is free from congestion, and the first message is used for the first IAB node to cancel rerouting of the source communication link; the second message is sent by the second IAB node on the rerouting link under the condition that the part of the link after the rerouting of the first IAB node is congested, and the second message is used for indicating the first IAB node to cancel the rerouting of the source communication link; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of the communication link based on the transmission status in the alternative link of the communication link.

Description

Message transmission method and device for rerouting indication

Technical Field

The application belongs to the technical field of communication, and particularly relates to a message transmission method and equipment for rerouting indication.

Background

The introduction of an Integrated Access and Backhaul (IAB) system is to solve the problem that when Access points are densely deployed, a wired transmission network is not deployed in place, that is, when there is no wired transmission network, the Access points may rely on a wireless Backhaul.

In the IAB system, the flow control feedback may trigger data rerouting, but ping-pong rerouting of data is easily caused, for example, the IAB1 reroutes data that needs to be transmitted to the path1 (path 1) to the path2 (path 2), and reroutes data that needs to be transmitted to the path2 to the path1, which brings extra operation complexity and unnecessary header rewriting (header rewriting) of the packet BAP to the IAB1, and cannot solve the congestion problem.

Disclosure of Invention

The embodiment of the application provides a message transmission method and device for rerouting indication, which can solve the problem of ping-pong rerouting of data in an IAB system.

In a first aspect, a message transmission method for rerouting indication is provided, including: the first IAB node receives at least one of: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the first IAB node to carry out rerouting is congested, and the first message is used for the first IAB node to cancel rerouting of the source communication link; the second message is sent by a second IAB node on a rerouted link when congestion occurs in a part of the link after the rerouting by the first IAB node, and the second message is used for indicating the first IAB node to cancel rerouting of a source communication link; wherein, part of the links after rerouting by the first IAB node are the egress links of the second IAB node; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In a second aspect, a message transmission method for rerouting indication is provided, including: the second IAB node sends at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the second IAB node when a link triggering the first IAB node to reroute is congested, the second IAB node being located on a source communication link, the first message being for the first IAB node to reroute the source communication link; the second message is sent by the second IAB node when the part of the link after rerouting by the first IAB node is congested, the second IAB node source is located on the rerouting link, and the second message is used for instructing the first IAB node to cancel rerouting of a source communication link, where the part of the link after rerouting by the first IAB node is an egress link of the second IAB node; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In a third aspect, a message transmission apparatus for rerouting indication is provided, including: a receiving module, configured to receive at least one of: a first message, a second message, a flow control message; wherein the first message is sent by a second IAB node on a source communication link when a link triggering the device to perform rerouting is in a congestion relieving condition, and the first message is used for the device node to cancel rerouting of the source communication link; the second message is sent by a second IAB node on a rerouted link when congestion occurs in a portion of the rerouted link by the apparatus, the second message being used to instruct the apparatus node to cancel rerouting of the source communication link; wherein, part of the links after the device performs rerouting are the egress links of the second IAB node; the flow control message is used to instruct the apparatus to determine whether to initiate a rerouting of a communication link based on a transmission status in an alternative link of the communication link.

In a fourth aspect, a message transmission apparatus for rerouting indication is provided, including: a sending module, configured to send, to the first IAB node, at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the apparatus in case of congestion relief for a link that triggers rerouting by the first IAB node, the apparatus being located on a source communication link, the first message being for the first IAB node to cancel rerouting of the source communication link; the second message is sent by the apparatus when congestion occurs in a part of links after rerouting by the first IAB node, the apparatus source is located on a rerouting link, and the second message is used for instructing the first IAB node to cancel rerouting of a source communication link; wherein, the part of the link after the rerouting by the first IAB node is the egress link of the device; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In a fifth aspect, there is provided a communication device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing a method according to the first aspect or implementing a method according to the second aspect.

In a sixth aspect, a communication device is provided, comprising a processor and a communication interface, wherein the communication interface is configured to receive at least one of: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the communication equipment to carry out rerouting is congested, and the first message is used for the communication equipment to cancel rerouting of the source communication link; the second message is sent by a second IAB node on a rerouting link when congestion occurs in a part of the rerouted link of the communication device, and the second message is used for instructing the communication device to cancel rerouting of a source communication link; wherein, part of the links after the communication device performs rerouting are the egress links of the second IAB node; the flow control message is used to instruct the communication device to determine whether to initiate a rerouting of a communication link based on a transmission status in an alternative link of the communication link. Alternatively, the communication interface is configured to send at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the communication device when the link triggering the first IAB node to reroute is decongested, the communication device being located on a source communication link, the first message being for the first IAB node to reroute the source communication link; the second message is sent by the communication device when the part of the link after rerouting by the first IAB node is congested, the source of the communication device is located on the rerouting link, and the second message is used for instructing the first IAB node to cancel rerouting of the source communication link; wherein, part of the links after rerouting by the first IAB node are egress links of the communication device; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In a seventh aspect, there is provided a readable storage medium on which a program or instructions is stored, which program or instructions, when executed by a processor, implement the method of the first aspect, or implement the method of the second aspect.

In an eighth aspect, a chip is provided, the chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a program or instructions to implement the method according to the first aspect, or to implement the method according to the second aspect.

In a ninth aspect, there is provided a program/program product stored on a non-transitory storage medium, the program/program product being executable by at least one processor to implement a method as in the first aspect, or to implement a method as in the second aspect.

In an embodiment of the present application, the first IAB node receives at least one of: the first message, the second message and the flow control message are limited by the first message, the second message and the flow control message, so that ping-pong rerouting caused by flow control feedback triggering can be avoided, unnecessary rerouting operation and unnecessary rewriting of a data packet BAP head are reduced, and the communication quality is improved.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application;

FIG. 2 is a diagram illustrating an example of a ping-pong rerouting problem according to an embodiment of the present application;

FIG. 3 is a schematic flow chart diagram of a message transmission method for rerouting indication according to an embodiment of the application;

fig. 4 is a schematic diagram of a specific application of a message transmission method for rerouting indication according to an embodiment of the present application;

fig. 5 is a schematic diagram of a specific application of a message transmission method for rerouting indication according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating a specific application of a message transmission method for rerouting indication according to an embodiment of the present application;

fig. 7 is a schematic format diagram of a second message according to an embodiment of the present application;

FIG. 8 is a schematic flow chart diagram of a message transmission method for rerouting indication in accordance with an embodiment of the application;

fig. 9 is a schematic structural diagram of a message transmission apparatus for rerouting indication according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a message transmission apparatus for rerouting indication according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a network-side device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally used herein in a generic sense to distinguish one element from another, and not necessarily from another element, such as a first element which may be one or more than one. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

It is noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE)/LTE Evolution (LTE-Advanced) systems, but may also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), single carrier-Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably in embodiments of the present application, and the described techniques may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for purposes of example, and, using NR terminology in much of the description below, the techniques may also be applied to applications other than NR system applications, such as generation 6 (6) systems ^th Generation, 6G) communication system.

Fig. 1 shows a schematic diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network-side device 12. Wherein, the terminal 11 may also be referred to as a terminal Device or a User Equipment (UE), the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palm Computer, a netbook, a super Mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (Wearable Device), a vehicle mounted Device (VUE), a pedestrian terminal (PUE), a smart home (a Device with wireless communication function, such as a refrigerator, a television, a washing machine, or furniture, etc.), and the Wearable Device includes: smart watch, smart bracelet, smart headset, smart glasses, smart jewelry (smart bracelet, smart ring, smart necklace, smart anklet, etc.), smart wristband, smart garment, game console, and so on. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network-side device 12 may be a Base Station or a core network, where the Base Station may be referred to as a node B, an enodeb, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a next generation node B (gNB), a home node B, a home enodeb, a WLAN access Point, a WiFi node, a Transmission Receiving Point (TRP), or some other suitable term in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, and it should be noted that, in the embodiment of the present application, only the Base Station in the NR system is taken as an example, but the specific type of the Base Station is not limited.

As shown in fig. 2, fig. 2 is an exemplary diagram of a ping-pong rerouting problem. In fig. 2, the flow control feedback message 1 (FCM 1) may trigger the IAB1 to start local rerouting (local rerouting), and the IAB1 transfers a part of data (for example, when the granularity of rerouting is each BH RLC CH or each BAP routing path ID) or all data (for example, when the granularity of rerouting is each BH link) from path1 to path2. If IAB1 receives FCM2 sent by IAB3 through path2, the FCM2 indicates that local rerouting is required to be performed to path1; at this time, IAB1 will reroute the data of path2 locally to path 1.

In this situation, it is explained that both path1 and path2 are congested, and therefore it is necessary to reduce the transmission of data, instead of performing local rerouting. Otherwise, it is equivalent to that the IAB1 performs ping-pong rerouting on the data (rerouting the data to be transmitted to the path1 to the path2, and rerouting the data to be transmitted to the path2 to the path 1), which brings extra operation complexity and unnecessary packet Backhaul Adaptation Protocol (BAP) header rewriting (header rewriting) to the IAB1, and cannot solve the congestion problem, and this ping-pong congestion may affect the service quality of the original service on the target alternative path, resulting in uncontrollable and unpredictable system service quality.

The following describes in detail a message transmission method and device for rerouting indication provided by the embodiments of the present application through some embodiments and application scenarios thereof with reference to the accompanying drawings.

To solve the problem of ping-pong rerouting of data in an IAB system, as shown in fig. 3, an embodiment of the present application provides a message transmission method 300 for rerouting indication, which may be performed by a first IAB node, in other words, by software or hardware installed in the first IAB node, and which includes the following steps.

S302: the first IAB node receives at least one of: a first message, a second message, and a flow control message.

The first message, the second message and the flow control message will be described in detail in three cases, namely, a scheme one, a scheme two and a scheme three. It should be noted that the following schemes may be implemented individually or collectively in any combination, and the present application is not limited thereto.

Scheme one

The first message is sent by a second IAB node on a source communication link when a link triggering the first IAB node to reroute is congested, and the first message is used for the first IAB node to cancel the rerouting of the source communication link. Wherein the source communication link (source link) is referred to as a re-routed link.

The first message may be carried by a BAP control (control) Protocol Data Unit (PDU).

In this embodiment, the first IAB node may be a parent node and the second IAB node may be a child node. In the example shown in fig. 2, the first IAB node may be IAB1 and the second IAB node may be IAB2.

In the example shown in fig. 2, the link that triggers the first IAB node to reroute may be a link between IAB2 and IAB4, the source communication link may be a link between IAB1 and IAB2, and the link between IAB1 and IAB3 may be a rerouting link.

By the method of the first scheme, when the link triggering the first IAB node to perform rerouting is released from congestion, the second IAB node sends the first message to the first IAB node, and the first IAB node can cancel the rerouting at the granularity corresponding to the source communication link according to the content of the first message, recover the transmission of data at the granularity corresponding to the source communication link, and can avoid ping-pong rerouting caused by flow control feedback triggering.

Scheme two

The second message may be carried by a BAP control PDU.

In this embodiment, the second message may be a newly designed message, or may be a flow control feedback message.

The second message is sent by a second IAB node on a rerouted link when congestion occurs in a part of the rerouted link after the first IAB node reroutes, and the second message is used for instructing the first IAB node to cancel rerouting of a source communication link; wherein, part of the links after rerouting by the first IAB node are the egress links of the second IAB node.

In this embodiment, the first IAB node may be a parent node and the second IAB node may be a child node. In the example shown in fig. 2, the first IAB node may be IAB1 and the second IAB node may be IAB3.

In the example shown in fig. 2, the part of the link rerouted by the first IAB node may be the link between IAB3 and IAB4, the rerouted link may be the link between IAB1 and IAB3, and the link between IAB1 and IAB2 may be the source communication link.

By the method of the second scheme, under the condition that congestion occurs in part of the links after rerouting, the second IAB node sends the second message to the first IAB node, and the first IAB node can cancel rerouting of the corresponding granularity of the source communication link according to the content of the second message, recover transmission of data in the source communication link, and can avoid ping-pong rerouting caused by flow control feedback triggering.

Scheme three

The flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

The flow control message may be sent by a second IAB node, the first IAB node may be a parent node, and the second IAB node may be a child node. In the example shown in fig. 2, the first IAB node may be IAB1 and the second IAB node may be IAB2.

In the example shown in fig. 2, the communication link may be a link between IAB2 and IAB4, and alternative links to the communication link may be links between IAB1 and IAB3 and between IAB3 and IAB 4.

In the scheme, if the transmission state of the replaceable link of the communication link is in a congestion state, the rerouting of the communication link is not started; and if the transmission state of the replaceable link of the communication link is not in the congestion state, starting rerouting of the communication link and taking the replaceable link as a rerouting link.

By the method of the third scheme, the first IAB node determines whether to start rerouting for the communication link based on the transmission state in the replaceable link of the communication link, and ping-pong rerouting caused by flow control feedback triggering can be avoided.

The first, second, and third embodiments may be implemented individually or in any combination.

In various embodiments of the present application, the first IAB node may include at least one of: IAB node, IAB hosted Distribution Unit (DU) node.

The links mentioned in the embodiments of the present application, such as the source communication link, the rerouting link, and the like, may be backhaul links.

In various embodiments of the present application, the granularity of rerouting may include at least one of: each BAP routing (routing) path; each Backhaul (BH) Radio Link Control (RLC) channel; each BH link (link). For example, in the second scheme, the granularity of the source communication link includes at least one of: each BAP routing path; each BH RLC channel; and the granularity of the rerouting link of each BH link is the same as that of the source communication link.

In the message transmission method for rerouting indication provided in the embodiment of the present application, the first IAB node receives at least one of the following: the first message, the second message and the flow control message are limited by the first message, the second message and the flow control message, so that ping-pong rerouting caused by flow control feedback triggering can be avoided, unnecessary rerouting operation and unnecessary rewriting of a data packet BAP (packet area packet) header are reduced, and the communication quality is improved.

The first, second and third schemes are described in detail below with reference to various embodiments.

In a first aspect, the triggering condition of the first message includes at least one of:

1) The congestion state release of data transmission corresponding to a BAP routing path, where a part of links of the BAP routing path are carried by the source communication link, includes: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value.

Optionally, before the first IAB node receives the first message, the second IAB node generates and sends a flow control message, where the flow control message is used to indicate that a transmission state corresponding to the BAP routing path is a congestion state.

2) The congestion state release of data transmission corresponding to a BH RLC channel, where the BH RLC channel is carried by the source communication link, includes: and the available buffer size corresponding to the BH RLC channel is larger than or equal to a first threshold value.

Optionally, before the first IAB node receives the first message, the second IAB node generates and sends a flow control message, where the flow control message is used to indicate that a transmission state corresponding to the BH RLC channel is a congestion state.

In this embodiment, the first threshold may be predefined by a network configuration or protocol, and the first threshold may be configured for each BAP routing ID/BH RLC CH, or may be configured to have a common value (e.g., A1) for all BAP routing IDs, or configured to have a common value (e.g., A2) for all BH RLC CHs.

In a first aspect, the first message may include at least one of the following 1) to 4):

1) And the identifier of the corresponding BAP routing path with the relieved congestion state of the data transmission, wherein part of the links of the BAP routing path are carried by the source communication link.

2) And the corresponding identifier of the BH RLC channel with the relieved congestion state for data transmission, wherein the BH RLC channel is borne by the source communication link.

3) And the available buffer size corresponding to the BAP routing path with the relieved congestion state of the corresponding data transmission is smaller than the available buffer size corresponding to the BAP routing path with the relieved congestion state, and part of links of the BAP routing path are carried by the source communication link.

4) And the BH RLC channel is corresponding to the available buffer size of the BH RLC channel with the relieved congestion state of the corresponding data transmission, and the BH RLC channel is borne by the source communication link.

In a second aspect, the triggering condition of the second message includes at least one of:

1) The data transmission corresponding to the BAP routing path is in a congestion state, a part of links of the BAP routing path are carried by the rerouting link, and the congestion state includes: and the available cache size corresponding to the BAP routing path is smaller than or equal to a second threshold value.

2) The data transmission corresponding to the BH RLC channel is in a congestion state, the BH RLC channel is borne by the rerouting link, and the congestion state comprises the following steps: and the available buffer size corresponding to the BH RLC channel is smaller than or equal to a second threshold value.

In this embodiment, the second threshold may be predefined by a network configuration or protocol, and the second threshold may be configured for each BAP routing ID/BH RLC CH, or may be configured to have a common value (e.g., B1) for all BAP routing IDs, or configured to have a common value (e.g., B2) for all BH RLC CHs.

In a second aspect, the second message includes at least one of:

1) And correspondingly transmitting the identification of the BAP routing path in the congestion state, wherein part of the links of the BAP routing path are carried by the rerouting link.

2) And correspondingly transmitting the identification of the BH RLC channel in a congestion state, wherein the BH RLC channel is carried by the rerouting link.

3) And transmitting the available buffer size corresponding to the BAP routing path in the congestion state, wherein part of links of the BAP routing path are carried by the rerouting link.

4) And the corresponding data transmission is in the available buffer size corresponding to the BH RLC channel in the congestion state, and the BH RLC channel is borne by the rerouting link.

In case that the first IAB node receives the second message, the method further comprises, in case that the first IAB node receives the second message: 1) In the event that an alternative link exists for the source communication link, the first IAB node selecting the alternative link as a rerouted link for the source communication link; or 2) in the case that the source communication link has no replaceable link, the first IAB node cancels the rerouting of the granularity corresponding to the source communication link; wherein data transmitted over the alternative link or the source communication link is supported to reach the same destination node, the alternative link is not in a congested state, and the granularity of the source communication link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

In this embodiment, the alternative links are either decided by the IAB node itself or configured by the IAB host node CU.

In this embodiment, in a case that the first IAB node cancels the rerouting of the granularity corresponding to the source communication link, the method further includes: the first IAB node starts a first timer, wherein the first timer is set for each granularity; wherein the first IAB node does not trigger rerouting to a granularity corresponding to the source communication link during the running of the first timer.

In various embodiments of scenario two, prior to the first IAB node receiving the second message, the method further comprises: and sending a first indication to the second IAB node on the rerouting link when the first IAB node reroutes the source communication link, wherein the first indication is used for indicating that the first IAB node reroutes the source communication link.

Optionally, the first indication may comprise at least one of: the rerouting ID, BH RLC CH, the first indication may be carried by a BAP control PDU.

In an example of the second scheme (see, specifically, the first embodiment below), the rerouting granularity is for each BH link, when a first IAB node receives a second message from a certain BH link (for example, receives an FC, and information in the FC indicates that a current cache size may trigger rerouting), if a BH link receiving the second message is a re-routed link (re-routed link) that needs to be performed by a traffic (origin is transmitted through a source link), the following determination is performed: whether there are other alternate links to reroute with respect to the source communication link; if yes, continuing to select the replaceable link to carry out rerouting of the traffic; and if not, canceling the rerouting of the granularity corresponding to the source communication link.

Alternatively, when a (disable) reroute operation is to be cancelled, a first reroute prohibit timer (i.e., a first timer) may be started, indicating that for the source communication link, the reroute operation is not triggered until the first reroute prohibit timer expires.

For example, the IAB1 stops the rerouting operation on the data on the source communication link at the time t1, and receives an FC that can trigger rerouting through the source communication link at the time t2, it needs to determine whether the first rerouting inhibition timer is still running at this time, and if so, the FC cannot trigger the rerouting operation; if not, the rerouting can be triggered.

In another example of the second scheme (see embodiment two later in detail), the rerouting granularity is per BAP routing path ID (per BAP routing ID), and the granularity for canceling rerouting at this time is also per BAP routing ID.

When a first IAB node receives a second message from a BH link (for example, an FC is received and information in the FC indicates that the current buffer size may trigger rerouting), if a link receiving the second message is a re-routed link that needs to be performed by a traffic (resource is transmitted through a BAP routing ID X1 on a source link), the following determination is performed: whether other BAP routing IDs which can be replaced relative to the BAP routing ID X1 on the source link exist for rerouting; if yes, continuously selecting the replaceable BAP routing ID to carry out rerouting of the traffic; if not, canceling (disable) all traffic rerouting operations using BAP routing ID X1 transmission paths on the source link.

Optionally, when a rerouting operation is to be disabled, a first rerouting inhibition timer (i.e., a first timer) may be started for the BAP routing ID, that is, for the BAP routing ID X1 of the source link, before the first rerouting inhibition timer expires, the rerouting operation for the BAP routing ID is no longer triggered.

For example, the IAB1 stops the rerouting operation on the data with the BAP routing ID = X1 on the source link at the time t1, and receives an FC that can trigger the rerouting of the BAP routing ID = X1 through the source link at the time t2, and then needs to determine whether the second rerouting prohibiting timer is still running at this time, and if yes, the FC cannot trigger the rerouting operation with the BAP routing ID = X1; if not, the trigger can be indicated.

It should be noted that, since the second rerouting disable timer is per BAP routing ID on, there may be the following cases: when the FC is received, some of the BAP routing IDs on the same link may be rerouted, but others may not start due to the running of the timer.

In another example of the second scheme, the rerouting granularity is Per BH RLC CH, and in this case, the disable granularity is also Per BH RLC CH; when a node receives a second message from a BH link (for example, an FC is received and information in the FC indicates that the current buffer size may trigger rerouting), if the link receiving the second message is a re-routed link that needs to be performed by a traffic (transmitted by origin through BH RLC CH Y1 on source link), the following determination is performed: whether other BH RLC CHs which can be replaced relative to BH RLC CH Y1 on the source link carry out rerouting or not; if yes, continuously selecting the replaceable BH RLC CH to carry out rerouting of the traffic; if not, the system can disable all traffic rerouting operations using the BH RLC CH transmission path on the source link.

Optionally, when the rerouting operation is to be disabled, a first rerouting prohibition timer may be started by the BH RLC CH, that is, for the BH RLC CH Y1 of the source link, before the first rerouting prohibition timer expires, the rerouting operation of the BH RLC CH is no longer triggered.

In a third aspect, in a case that the first IAB node receives the flow control message, the method further includes: the first IAB node determining a transmission state of the alternative link, the transmission state including being in a congested state or not being in a congested state; the first IAB node determining whether to initiate a reroute of the communication link based on the transmission status of the alternative link, the granularity of the reroute including at least one of: each BAP routing path; each BH RLC channel; each BH link.

In this embodiment, the first IAB node determining whether to initiate rerouting of the communication link based on the transmission status of the alternative link comprises: in the case that an alternative link which is not in a congestion state exists in the alternative links, starting rerouting of the communication link based on the alternative link which is not in the congestion state; and canceling the rerouting of the communication link in a case where there is no alternative link that is not in a congested state among the alternative links.

In a third aspect, the first IAB node determining the transmission status of the alternative link comprises: the first IAB node determining whether a valid flow control state exists for the alternative link; under the condition that the replaceable link does not have an effective flow control state, the first IAB node sends a flow control polling message to acquire the effective flow control state of the replaceable link; the granularity of the fluidic state includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

In this embodiment, the first IAB node determining whether there is a valid flow control state for the alternative link includes the following steps 1) and 2): 1) The first IAB node determining whether a second timer corresponding to the alternative link expires, wherein the granularity of the second timer comprises at least one of: each BH link, each uplink BH link, each downlink BH link, each uplink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each downlink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each uplink BH link corresponding to a flow control message reported by adopting a BAP routing path format, and each downlink BH link corresponding to a flow control message reported by adopting a BAP routing path format; 2) Determining that a valid flow control state exists for the alternative link if the second timer has not expired.

This embodiment considers that each Flow control message delivers the Flow control status according to the configured format (e.g. CU can configure the message as a format of per BH RLC CH or routing ID), and when triggering the Flow control message, all BH RLC CHs or all routing IDs on this link are included in the message, and thus are per link level. However, per link goes up and down, so it is per DL link and per UL link. In addition, because of the difference of the flow control formats, the granularity of the second timer here can be divided into formats other than uplink and downlink. That is, when the BH RLC CH format is selected for transmission, both the uplink and the downlink can be respectively provided with a timer; when the routing ID is selected, there may also be a timer for each of the uplink and downlink.

The method provided in this embodiment may further include the steps of: and starting the second timer when the flow control message corresponding to the replaceable link is received by the first IAB node and/or when the first IAB node is in a non-single link state.

In an example of scenario three (see embodiment three below in detail), the first IAB node actively collects traffic conditions of all links. After receiving the FC capable of triggering rerouting, the first IAB node does not trigger rerouting immediately, but actively acquires congestion states on other replaceable links and then determines, specifically including the following steps: condition 1: the first IAB node receives FC1 sent by any link (assumed to be link 1); condition 2: FC1 displays that some BAP routing ID (or some BH RLC CH or some link) has enough buffer size remaining to trigger Local re-routing (up to the CU preconfigured concatenated threshold).

Action 1: the first IAB node checks whether other links have a valid FC status, initiates FC polling to the child nodes of all links (such as link 2) in "no valid FCM status", and the format of the FCM is consistent with that of FC1 received on link1 (such as per BH RLC CH trigger or per BAP routing ID trigger) to obtain the traffic status report of backhaul link.

And action 2: after obtaining the link statuses of all links, check whether a second scheme is satisfied: and (4) disabling the condition of local re-routing in the passive notification, if so, not triggering the local re-routing corresponding to the granularity, and otherwise, executing.

This embodiment may also define the validity period after receiving FC, for example, start a timer (second timer) that specifies the status of the link valid during the running of the timer, which is designed for per BH link per UL, per BH link per DL.

Optionally, when the first IAB node is in a single Link (whether the single Link is for current uplink flow control or downlink flow control, for example, the IAB3 node in fig. 4, there are two links in the uplink, but there is only one in the downlink), this timer may not be triggered after receiving the FCM (because there is no meaning).

Further, the timer may be triggered on the premise that "local re-routing capable of being based on FCM" is configured, and the condition is satisfied.

In the foregoing embodiments of the present application, in a case that the first IAB node starts rerouting of a communication link, the method further includes: the first IAB node starts a third timer, and the granularity of the third timer includes at least one of: each BAP routing path; each BH RLC channel; each BH link; the first IAB node canceling rerouting of the communication link if the third timer expires; the granularity of the backhaul link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

In this embodiment, a duration (e.g., rerouting timer) after rerouting is triggered is defined, and configuration is performed according to the granularity of rerouting, and if a per BH RLC CH performs rerouting, a corresponding rerouting timer is set for each BH RLC CH; after the timer is overtime, the data corresponding to the corresponding BH RLC CH/BAP routing ID/BH link is recovered to normal transmission (namely, rerouting operation is not carried out) unless triggered again. Furthermore, if the local re-routing operation is terminated by other processes, the timer needs to be stopped accordingly.

In the foregoing embodiments of the present application, the first IAB node may also be a child node of another IAB node, and when the first IAB node receives the flow control polling message, the method further includes at least one of: 1) The first IAB node generates flow control messages aiming at all the egress links; 2) The first IAB node generates a flow control message for an egress link for which a fourth timer is not running, wherein the first IAB node is further configured to start the fourth timer after sending the flow control message to the egress link.

Generating the flow control message for the egress link not running by the fourth timer comprises: and generating the flow control message aiming at the outlet link on which the fourth timer does not run based on the type of the flow control message.

For example (example 1), when a first IAB node receives polling, the first IAB node needs to generate FCs for all the egress links.

For another example (example 2), when the first IAB node starts the inhibit timer for the egr link after sending FC, and when the first IAB node receives polling, the node performs FC feedback on all links without the inhibit timer running in the egr link.

For another example (example 3), due to the fact that other streaming link flow control polling is required after receiving "FC indicating rerouting is available", the polling message generated at this time is represented by a new pdu type value, and the first IAB node determines the polling type according to the pdu type value after receiving the polling message, and operates according to the timer described in example 2. Example 3 differs from example 2 in that example 2 has a restriction on Polling triggered FC at all times, whereas example 3 has a restriction on only Polling triggered rerouting; in some cases, the node may need to refresh the state of the child node egresses link urgently, which may be problematic if the prohibit timer is set.

In order to describe the message transmission method for rerouting indication provided in the embodiments of the present application in detail, the following description will be made with reference to several specific embodiments.

Example one

This embodiment is shown in fig. 5. Suppose that at time T1, the IAB1 receives FC1 (through BH link 1) sent by the IAB2, and information indicated by the FC indicates that the rerouting trigger condition is reached.

The IAB1 reroutes part of data originally transmitted through the BH Link1 to other links for transmission; at this point, an alternative BH link needs to be selected, which may be configured in advance by the CU or selected by the IAB1 node itself. Suppose that a CU configuration is adopted and the rerouting list configured by the CU to the IAB1 node is as follows:

Previous BH link	Link for local re-routing	priority level
			BH link1	BH link2	1 (high)
BH link1	BH link3	2 (Low)

The IAB1 node therefore preferentially selects BH link2 as the alternative link for BH link1 for rerouting of data.

At time T2, the IAB1 receives a second message or FC2 sent by the IAB3 through the BH link2 (and the information in the FC indicates that the current buffer size may trigger rerouting of BH link2 data), and it is assumed that the PDU type of the second message = "1111".

The IAB1 node, upon receiving the second message, knows that the link sending the second message is in a congested state and may trigger rerouting.

Because there are 2 replaceable links (there are 2 links that can be rerouted) of the current link1, upon receiving notification that link2 is congested, the IAB1 node may continue to select another available link (i.e., the link3 with the lower priority) for rerouting of link1 data.

In another example, if a CU is only configured with 1 alternative BH link (say BH link 2) to the IAB1 node, then upon receipt of this second message, the rerouting operation for the BH link1 data is cancelled and normal transmission of data on BH link1 is resumed.

Optionally, when transmission is resumed, a first rerouting prohibition timer may be started, and in the running process of the timer, even if the IAB1 node receives an FC indication on the BH link1 again to trigger rerouting, the IAB1 node may not start a rerouting operation for the BH link 1.

Example two

In the embodiment shown in fig. 6, there are 3 different types of traffic (i.e., BAP routing ID = 1/2/5) on BH link1 (link between IAB1 and IAB 2), and reception of the FC sent on link1 by IAB1 at time T1 indicates that the congestion condition of BAP routing ID =1/2/5 is as described in the above table.

The CU configures IAB1 nodes with alternative routing IDs of BAP routing ID =1 and 2, but does not configure corresponding entries for BAP routing ID = 5. That is, the rerouting configuration list received at the IAB1 node is as follows, so that IAB1 will only reroute data with routing ID =1 and 2:

at time T2, the IAB1 receives a second notification message or FC2 sent by the IAB3 through the BH link2 (and the information in the FC indicates that the current buffer size may trigger rerouting of BH link2 data), and if the sent message is a second message, a specific format of the second message is as shown in fig. 7, where PDU type = "1110".

The IAB1 node, upon receiving the second message, knows that the BAP routing ID3 and ID6 in the link that sent the second message are in a congested state and can trigger rerouting. If the message is an FC message, the parent node still judges which BAP routing IDs can trigger rerouting according to a threshold which is configured in advance by the CU and can trigger rerouting.

Since the replaceable ID4 of the current BAP routing ID1 is still in the normal state, the IAB1 node can continue to reroute data for ID1, but the replaceable ID3 of BAP routing ID2 is congested, so the IAB1 node needs to enable the rerouting operation for data of routing ID2 type.

Optionally, when the rerouting operation of ID2 is disabled, a second rerouting prohibition timer may be started, and in the running process of the timer, even if the IAB1 node receives an FC indication on the BH link1 again to trigger the rerouting of ID2, the IAB1 node does not start the rerouting operation for ID 2.

EXAMPLE III

Also taking fig. 5 as an example for description, when the IAB1 receives FC1 at Link1 (BH Link1 in fig. 5), FC _ status _ timer1 on Link1 is turned on, and the available buffer size therein reaches the threshold value (per BH RLC CH/per BAP routing ID/per BH Link) that triggers local re-routing.

The IAB1 checks whether FC _ status _ timers corresponding to other downlink links are still running, if the FC _ status _ timers are still running, the state of the FC2 received last time is still valid, and an FC polling message does not need to be sent to the corresponding Link; otherwise, sending FC polling message to all links (such as link 3) in 'no effective FC state', wherein the format of the FC message is consistent with that of the received FC1 (per BAP routing ID/per BH link);

BH link ID	FC_status_timer status
		BH link1	Running
BH link2	Running
		BH link3	N/A (expired or not received FC before)

In this embodiment, FC polling needs to be sent to BH link 3.

The IAB1 receives the FC3, if the FC3 does not trigger local re-routing, the per BH RLC CH/BAP routing ID/BH link routing can be carried out on the data of the link1 (to the link 3), and specific operations are shown in the second embodiment.

The message transmission method for rerouting indication according to the embodiment of the present application is described in detail above with reference to fig. 2. A message transmission method for rerouting indication according to another embodiment of the present application will be described in detail with reference to fig. 8. It is to be understood that the interaction between the second IAB node and the first IAB node described from the second IAB node is the same as that described on the first IAB node side in the method shown in fig. 2, and the related description is appropriately omitted to avoid redundancy.

Fig. 8 is a schematic flowchart of an implementation of a message transmission method for rerouting indication according to an embodiment of the present application, and may be applied to a second IAB node. As shown in fig. 8, the method 800 includes the following steps.

S802: the second IAB node sends at least one of: a first message, a second message, a flow control message.

Wherein the first message is sent by the second IAB node when a link triggering the first IAB node to reroute is congested, the second IAB node being located on a source communication link, the first message being for the first IAB node to reroute the source communication link; the second message is sent by the second IAB node when the part of the link after rerouting by the first IAB node is congested, the second IAB node source is located on the rerouting link, and the second message is used for instructing the first IAB node to cancel rerouting of a source communication link, where the part of the link after rerouting by the first IAB node is an egress link of the second IAB node; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In the embodiment of the application, ping-pong rerouting caused by flow control feedback triggering can be avoided through the action restriction of the first message, the second message and the flow control message, so that unnecessary rerouting operation and unnecessary rewriting of a data packet BAP header are reduced, and the communication quality is improved.

Optionally, as an embodiment, the granularity of the source communication link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, the triggering condition of the first message includes at least one of: 1) The congestion state release of data transmission corresponding to a BAP routing path, where a part of links of the BAP routing path are carried by the source communication link, includes: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value; 2) The relieving of the congestion state of the data transmission corresponding to the BH RLC channel, wherein the BH RLC channel is borne by the source communication link, and the relieving of the congestion state of the data transmission corresponding to the BH RLC channel comprises the following steps: and the available buffer size corresponding to the BH RLC channel is larger than or equal to a first threshold value.

Optionally, as an embodiment, before the second IAB node sends the first message, the method further includes: and the second IAB node generates and sends a flow control message, wherein the flow control message is used for indicating that the transmission state corresponding to the BAP routing path is a congestion state, and/or the second IAB node generates and sends a flow control message, and the flow control message is used for indicating that the transmission state corresponding to the BH RLC channel is a congestion state.

Optionally, as an embodiment, the first message includes at least one of: 1) Corresponding to the identifier of the BAP routing path with relieved congestion state of data transmission, wherein part of the links of the BAP routing path are carried by the source communication link; 2) An identifier of a corresponding BH RLC channel for data transmission congestion state relief, wherein the BH RLC channel is carried by the source communication link; 3) The size of an available buffer corresponding to a BAP routing path with relieved congestion state of corresponding data transmission, wherein part of links of the BAP routing path are carried by the source communication link; 4) And the corresponding available buffer size of the BH RLC channel with the relieved congestion state of the corresponding data transmission is borne by the source communication link.

Optionally, as an embodiment, the triggering condition of the second message includes at least one of: 1) The data transmission corresponding to the BAP routing path is in a congestion state, a part of links of the BAP routing path are carried by the rerouting link, and the congestion state comprises the following steps: the available cache size corresponding to the BAP routing path is smaller than or equal to a second threshold value; 2) The data transmission corresponding to the BH RLC channel is in a congestion state, the BH RLC channel is carried by the rerouting link, and the congestion state comprises the following steps: and the available buffer size corresponding to the BH RLC channel is less than or equal to a second threshold.

Optionally, as an embodiment, the second message includes at least one of: 1) Corresponding data transmission is carried out on the identification of a BAP routing path in a congestion state, and part of links of the BAP routing path are carried by the rerouting links; 2) The corresponding data is transmitted to the mark of a BH RLC channel in a congestion state, and the BH RLC channel is borne by the rerouting link; 3) The size of an available buffer corresponding to a BAP routing path of which the corresponding data transmission is in a congestion state, wherein part of links of the BAP routing path are carried by the rerouting link; 4) And the corresponding data transmission is in the available buffer size corresponding to the BH RLC channel in the congestion state, and the BH RLC channel is borne by the rerouting link.

Optionally, as an embodiment, before the second IAB node sends the second message, the method further includes: the second IAB node receives a first indication indicating that the first IAB node rerouted the source communication link.

Optionally, as an embodiment, in a case that the second IAB node receives the flow control polling message, the method further includes at least one of: 1) Generating flow control messages for all egress links; 2) And generating a flow control message aiming at an egress link which does not run by a fourth timer, wherein the second IAB node is further used for starting the fourth timer after the flow control message is sent to the egress link.

Optionally, as an embodiment, the generating a flow control message for an egress link on which the fourth timer is not running includes: generating a flow control message for an egress link on which the fourth timer is not running based on the type of the flow control message.

It should be noted that, in the message transmission method for rerouting indication provided in the embodiment of the present application, the execution main body may be a message transmission device for rerouting indication, or a control module in the message transmission device for rerouting indication, which is used to execute the message transmission method for rerouting indication. In this embodiment of the present application, a message transmission apparatus for rerouting indication executes a message transmission method for rerouting indication as an example, and the message transmission apparatus for rerouting indication provided in this embodiment of the present application is described.

Fig. 9 is a schematic structural diagram of a message transmission apparatus for rerouting indication according to an embodiment of the present application, where the apparatus may correspond to the first IAB node in other embodiments. As shown in fig. 9, the apparatus 900 includes the following modules.

A receiving module 902, which may be configured to receive at least one of: a first message, a second message, a flow control message; wherein the first message is sent by a second IAB node on a source communication link under the condition that a link for rerouting by the device is triggered to relieve congestion, and the first message is used for the device node to cancel rerouting of the source communication link; the second message is sent by a second IAB node on a rerouted link when a portion of the rerouted link of the apparatus is congested, the second message being used to instruct the apparatus node to cancel rerouting of a source communication link; wherein, part of the links after the device performs rerouting are the egress links of the second IAB node; the flow control message is used to instruct the apparatus to determine whether to initiate a rerouting of a communication link based on a transmission status in an alternative link of the communication link.

Optionally, as an embodiment, the granularity of the source communication link includes at least one of: each backhaul adaptation protocol, BAP, routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, the first message and/or the second message are carried by a BAP control PDU.

Optionally, as an embodiment, the triggering condition of the first message includes at least one of: 1) The congestion state of data transmission corresponding to the BAP routing path is released, a part of links of the BAP routing path are carried by the source communication link, and the congestion state release of the data transmission corresponding to the BAP routing path comprises the following steps: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value; 2) The relieving of the congestion state of the data transmission corresponding to the BH RLC channel, wherein the BH RLC channel is borne by the source communication link, and the relieving of the congestion state of the data transmission corresponding to the BH RLC channel comprises the following steps: and the available buffer size corresponding to the BH RLC channel is larger than or equal to a first threshold value.

Optionally, as an embodiment, before receiving the first message, the second IAB node generates and sends a flow control message, where the flow control message is used to indicate that a transmission state corresponding to the BAP routing path is a congestion state, and/or before receiving the first message, the second IAB node generates and sends a flow control message, where the flow control message is used to indicate that a transmission state corresponding to the BH RLC channel is a congestion state.

Optionally, as an embodiment, the first message includes at least one of: 1) An identifier of a corresponding BAP routing path with relieved congestion state for data transmission, wherein part of links of the BAP routing path are carried by the source communication link; 2) An identifier of a corresponding BH RLC channel for data transmission congestion state relief, wherein the BH RLC channel is carried by the source communication link; 3) The size of an available cache corresponding to a BAP routing path with relieved congestion state of corresponding data transmission, wherein part of links of the BAP routing path are carried by the source communication link; 4) And the corresponding available buffer size of the BH RLC channel with the relieved congestion state of the corresponding data transmission is borne by the source communication link.

Optionally, as an embodiment, the triggering condition of the second message includes at least one of: 1) The data transmission corresponding to the BAP routing path is in a congestion state, a part of links of the BAP routing path are carried by the rerouting link, and the congestion state includes: the available cache size corresponding to the BAP routing path is smaller than or equal to a second threshold value; 2) The data transmission corresponding to the BH RLC channel is in a congestion state, the BH RLC channel is borne by the rerouting link, and the congestion state comprises the following steps: and the available buffer size corresponding to the BH RLC channel is smaller than or equal to a second threshold value.

Optionally, as an embodiment, the second message includes at least one of: 1) Corresponding data transmission is carried out on the identification of a BAP routing path in a congestion state, and part of links of the BAP routing path are carried by the rerouting link; 2) The corresponding data is transmitted with the identification of a BH RLC channel in a congestion state, and the BH RLC channel is carried by the rerouting link; 3) The size of an available buffer corresponding to a BAP routing path of which the corresponding data transmission is in a congestion state, wherein part of links of the BAP routing path are carried by the rerouting link; 4) And the corresponding data transmission is in the available buffer size corresponding to the BH RLC channel in the congestion state, and the BH RLC channel is borne by the rerouting link.

Optionally, as an embodiment, in a case that the second message is received, the apparatus further includes a selection module configured to: in the event that an alternative link exists for the source communication link, selecting the alternative link as a rerouted link for the source communication link; or canceling the rerouting of the granularity corresponding to the source communication link under the condition that the replaceable link does not exist in the source communication link; wherein data transmitted over the alternative link or the source communication link is supported to reach the same destination node, the alternative link is not in a congested state, and the granularity of the source communication link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, in a case that rerouting of the granularity corresponding to the source communication link is cancelled, the apparatus further includes a starting module, configured to start a first timer, where the first timer is set for each granularity; wherein the apparatus does not trigger rerouting of the granularity corresponding to the source communication link during operation of the first timer.

Optionally, as an embodiment, the apparatus further includes a sending module, configured to send, in a case that the apparatus reroutes the source communication link before receiving the second message, a first indication to the second IAB node on the reroute link, where the first indication is used to indicate that the apparatus point reroutes the source communication link.

Optionally, as an embodiment, the apparatus further includes a processing module, configured to determine a transmission status of the replaceable link, where the transmission status includes being in a congested state or not being in a congested state; determining whether to initiate rerouting of the communication link based on the transmission status of the alternative link, the granularity of rerouting including at least one of: each BAP routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, the processing module is configured to, in a case that there is an alternative link that is not in a congested state among the alternative links, start rerouting of the communication link based on the alternative link that is not in the congested state; in the case where there is no alternative link that is not in a congested state among the alternative links, rerouting of the communication link is cancelled.

Optionally, as an embodiment, the processing module is configured to determine whether a valid flow control state exists in the replaceable link; the device also comprises a sending module, configured to send a flow control polling message to obtain an effective flow control state of the replaceable link when the replaceable link does not have an effective flow control state; the granularity of the fluidic state includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, the processing module is configured to determine whether a second timer corresponding to the replaceable link expires, where a granularity of the second timer includes at least one of: each BH link, each uplink BH link, each downlink BH link, each uplink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each downlink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each uplink BH link corresponding to a flow control message reported by adopting a BAP routing path format, and each downlink BH link corresponding to a flow control message reported by adopting a BAP routing path format; determining that a valid flow control state exists for the alternative link if the second timer has not expired.

Optionally, as an embodiment, the apparatus further includes a starting module, configured to start the second timer when the apparatus receives a flow control message corresponding to the replaceable link and/or when the apparatus is in a non-single link state.

Optionally, as an embodiment, the apparatus further includes a starting module, configured to start a third timer when the apparatus starts rerouting the communication link, where a granularity of the third timer includes at least one of: each BAP routing path; each BH RLC channel; each BH link; the apparatus further comprises a processing module for canceling rerouting of the communication link if the third timer times out; the granularity of the backhaul link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

Optionally, as an embodiment, the apparatus further includes a processing module, configured to, in a case that the apparatus receives the flow control polling message, perform at least one of the following: generating flow control messages for all egress links; generating a flow control message for an egress link in which a fourth timer is not running, wherein the apparatus is further configured to start the fourth timer after sending the flow control message to the egress link;

optionally, as an embodiment, the generating a flow control message for an egress link not running by the fourth timer includes: generating a flow control message for an egress link on which the fourth timer is not running based on the type of the flow control message.

Optionally, as an embodiment, the apparatus includes at least one of: IAB nodes, IAB host distribution unit, DU, nodes.

The apparatus 900 according to the embodiment of the present application may refer to the flow corresponding to the method 200 according to the embodiment of the present application, and each unit/module and the other operations and/or functions described above in the apparatus 900 are respectively for implementing the corresponding flow in the method 200 and achieving the same or equivalent technical effects, and are not described herein again for brevity.

The message transmission device for rerouting indication in the embodiment of the present application may be a device, a device or an electronic device having an operating system, or may be a component, an integrated circuit, or a chip in a terminal. The device or the electronic equipment can be a mobile terminal or a non-mobile terminal. For example, the mobile terminal may include, but is not limited to, the above-listed type of terminal 11, and the non-mobile terminal may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine, a kiosk, or the like, and the embodiments of the present application are not limited in particular.

The message transmission device for rerouting indication provided in the embodiment of the present application can implement each process implemented by the method embodiments of fig. 3 to fig. 7, and achieve the same technical effect, and is not described here again to avoid repetition.

Fig. 10 is a schematic structural diagram of a message transmission apparatus for rerouting indication according to an embodiment of the present application, where the apparatus may correspond to a second IAB node in other embodiments. As shown in fig. 10, the apparatus 1000 includes the following modules.

A sending module 1002, configured to send, to the first IAB node, at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the apparatus on a decongestion condition of a link that triggers rerouting by the first IAB node, the apparatus being located on a source communication link, the first message being for the first IAB node to cancel rerouting of the source communication link; the second message is sent by the apparatus when congestion occurs in part of the links after rerouting by the first IAB node, the apparatus source is located on a rerouting link, and the second message is used to instruct the first IAB node to cancel rerouting of a source communication link; wherein, the part of the links after rerouting by the first IAB node are egress links of the apparatus; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

In the embodiment of the application, ping-pong rerouting caused by flow control feedback triggering can be avoided through action restriction of the first message, the second message and the flow control message, unnecessary rerouting operation and unnecessary rewriting of a BAP (packet overhead) header of a data packet are reduced, and communication quality is improved.

Optionally, as an embodiment, the triggering condition of the first message includes at least one of: 1) The congestion state release of data transmission corresponding to a BAP routing path, where a part of links of the BAP routing path are carried by the source communication link, includes: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value; 2) The congestion state release of data transmission corresponding to a BH RLC channel, where the BH RLC channel is carried by the source communication link, includes: and the available buffer size corresponding to the BH RLC channel is larger than or equal to a first threshold value.

Optionally, as an embodiment, the sending module 1002 is further configured to: and generating and sending a flow control message, wherein the flow control message is used for indicating that the transmission state corresponding to the BAP routing path is the congestion state, and/or generating and sending the flow control message, and the flow control message is used for indicating that the transmission state corresponding to the BH RLC channel is the congestion state.

Optionally, as an embodiment, the first message includes at least one of: 1) An identifier of a corresponding BAP routing path with relieved congestion state for data transmission, wherein part of links of the BAP routing path are carried by the source communication link; 2) The identifier of a corresponding BH RLC channel for relieving the congestion state of data transmission, wherein the BH RLC channel is borne by the source communication link; 3) The size of an available buffer corresponding to a BAP routing path with relieved congestion state of corresponding data transmission, wherein part of links of the BAP routing path are carried by the source communication link; 4) And the BH RLC channel is corresponding to the available buffer size of the BH RLC channel with the relieved congestion state of the corresponding data transmission, and the BH RLC channel is borne by the source communication link.

Optionally, as an embodiment, the triggering condition of the second message includes at least one of: 1) The data transmission corresponding to the BAP routing path is in a congestion state, a part of links of the BAP routing path are carried by the rerouting link, and the congestion state comprises the following steps: the available cache size corresponding to the BAP routing path is smaller than or equal to a second threshold value; 2) The data transmission corresponding to the BH RLC channel is in a congestion state, the BH RLC channel is carried by the rerouting link, and the congestion state comprises the following steps: and the available buffer size corresponding to the BH RLC channel is smaller than or equal to a second threshold value.

Optionally, as an embodiment, the second message includes at least one of: 1) Corresponding data transmission is carried out on the identification of a BAP routing path in a congestion state, and part of links of the BAP routing path are carried by the rerouting links; 2) The corresponding data is transmitted with the identification of a BH RLC channel in a congestion state, and the BH RLC channel is carried by the rerouting link; 3) The size of an available buffer corresponding to a BAP routing path of which the corresponding data transmission is in a congestion state, wherein part of links of the BAP routing path are carried by the rerouting link; 4) And the corresponding data transmission is in the available buffer size corresponding to the BH RLC channel in the congestion state, and the BH RLC channel is borne by the rerouting link.

Optionally, as an embodiment, the apparatus further includes a receiving module, configured to receive a first indication, where the first indication is used to indicate that the first IAB node reroutes the source communication link.

Optionally, as an embodiment, the apparatus further includes a generating module, configured to, when the apparatus receives the flow control polling message, perform at least one of the following: 1) Generating flow control messages for all egress links; 2) And generating a flow control message for an egress link on which a fourth timer is not running, wherein the apparatus is further configured to start the fourth timer after sending the flow control message to the egress link.

The apparatus 1000 according to the embodiment of the present application may refer to the flow corresponding to the method 800 in the embodiment of the present application, and each unit/module and the other operations and/or functions in the apparatus 1000 are respectively for realizing the corresponding flow in the method 800 and achieving the same or equivalent technical effects, and for brevity, no further description is provided herein.

Optionally, as shown in fig. 11, an embodiment of the present application further provides a communication device 1100, which includes a processor 1101, a memory 1102, and a program or an instruction stored in the memory 1102 and executable on the processor 1101, for example, when the communication device 1100 is a first IAB node, the program or the instruction is executed by the processor 1101 to implement the processes of the message transmission method embodiment for rerouting indication, and achieve the same technical effect. When the communication device 1100 is the second IAB node, the program or the instruction is executed by the processor 1101 to implement the processes of the above-mentioned message transmission method embodiment for rerouting indication, and can achieve the same technical effect, and for avoiding repetition, details are not described here again.

An embodiment of the present application further provides a terminal, including a processor and a communication interface, where the communication interface is configured to receive at least one of: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the terminal to carry out rerouting is free from congestion, and the first message is used for canceling rerouting of the source communication link by the terminal; the second message is sent by a second IAB node on a rerouting link when congestion occurs in part of the rerouted link of the terminal, and the second message is used for indicating the terminal to cancel rerouting of a source communication link; wherein, part of the links after the terminal performs rerouting are the exit links of the second IAB node; the flow control message is used for instructing the terminal to determine whether to start rerouting of the communication link based on a transmission state in an alternative link of the communication link. Alternatively, the communication interface is configured to send at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the terminal when a link triggering the first IAB node to reroute is congested, the terminal is located on a source communication link, and the first message is used for the first IAB node to cancel the rerouting of the source communication link; the second message is sent by the terminal when the part of the link after rerouting by the first IAB node is congested, the terminal source is located on the rerouting link, and the second message is used for indicating the first IAB node to cancel rerouting of the source communication link; wherein, the part of the link after the rerouting by the first IAB node is the exit link of the terminal; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

The terminal embodiment corresponds to the first IAB node or the second IAB node side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment and can achieve the same technical effect. Specifically, fig. 12 is a schematic diagram of a hardware structure of a terminal for implementing the embodiment of the present application.

The terminal 1200 includes, but is not limited to: at least some of the radio unit 1201, the network module 1202, the audio output unit 1203, the input unit 1204, the sensor 1205, the display unit 1206, the user input unit 1207, the interface unit 1208, the memory 1209, and the processor 1210.

Those skilled in the art will appreciate that the terminal 1200 may further comprise a power supply (e.g., a battery) for supplying power to various components, and the power supply may be logically connected to the processor 1210 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system. The terminal structure shown in fig. 12 does not constitute a limitation of the terminal, and the terminal may include more or less components than those shown, or combine some components, or have a different arrangement of components, and thus will not be described again.

It should be understood that, in the embodiment of the present application, the input Unit 1204 may include a Graphics Processing Unit (GPU) 12041 and a microphone 12042, and the Graphics Processing Unit 12041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1206 may include a display panel 12061, and the display panel 12061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1207 includes a touch panel 12071 and other input devices 12072. A touch panel 12071, also referred to as a touch screen. The touch panel 12071 may include two parts, a touch detection device and a touch controller. Other input devices 12072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

In this embodiment of the application, the radio frequency unit 1201 receives downlink data from a network side device and then processes the downlink data to the processor 1210; in addition, the uplink data is sent to the network side equipment. Typically, the radio frequency unit 1201 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 1209 may be used to store software programs or instructions and various data. The memory 1209 may mainly include a storage program or instruction area and a storage data area, wherein the storage program or instruction area may store an operating system, an application program or instruction (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. In addition, the Memory 1209 may include a high-speed random access Memory (ram), and may further include a non-transitory Memory, where the non-transitory Memory may be a Read Only Memory (ROM), a Programmable ROM (PROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), or a flash Memory. Such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.

Processor 1210 may include one or more processing units; optionally, the processor 1210 may integrate an application processor, which mainly handles operating systems, user interfaces, and applications or instructions, etc., and a modem processor, which mainly handles wireless communications, such as a baseband processor. It is to be appreciated that the modem processor described above may not be integrated into processor 1210.

The radio frequency unit 1201 may be configured to receive at least one of: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the terminal to carry out rerouting is free from congestion, and the first message is used for canceling rerouting of the source communication link by the terminal; the second message is sent by a second IAB node on a rerouting link under the condition that a part of the rerouted link of the terminal is congested, and the second message is used for indicating the terminal to cancel rerouting of a source communication link; wherein, part of the links after the terminal reroutes are the exit links of the second IAB node; the flow control message is used for instructing the terminal to determine whether to start rerouting of the communication link based on a transmission state in an alternative link of the communication link. Alternatively, the radio frequency unit 1201 may be configured to send, to the first IAB node, at least one of: a first message, a second message, a flow control message; wherein the first message is sent by the terminal when a link triggering the first IAB node to reroute is congested, the terminal is located on a source communication link, and the first message is used for the first IAB node to cancel the rerouting of the source communication link; the second message is sent by the terminal when the part of the link after rerouting by the first IAB node is congested, the terminal source is located on the rerouting link, and the second message is used for indicating the first IAB node to cancel rerouting of the source communication link; wherein, the part of the link after the rerouting by the first IAB node is the exit link of the terminal; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

The terminal 1200 provided in this embodiment may also implement each process of the foregoing message transmission method for rerouting indication, and may achieve the same technical effect, and for avoiding repetition, details are not repeated here.

An embodiment of the present application further provides a network side device, which includes a processor and a communication interface, where the communication interface is configured to receive at least one of the following: a first message, a second message, a flow control message; the first message is sent by a second IAB node on a source communication link under the condition that a link triggering the network side device to perform rerouting is free from congestion, and the first message is used for the network side device to cancel rerouting of the source communication link; the second message is sent by a second IAB node on a rerouting link when congestion occurs in a part of the rerouted link, where the second message is used to instruct the network-side device to cancel rerouting of a source communication link; wherein, part of the links after the network side device performs rerouting are the egress links of the second IAB node; the flow control message is used for instructing the network side device to determine whether to start rerouting of the communication link based on a transmission state in an alternative link of the communication link. Alternatively, the communication interface is configured to send at least one of: a first message, a second message, a flow control message; the first message is sent by the network side device when a link triggering the first IAB node to reroute is congested, the network side device is located on a source communication link, and the first message is used for the first IAB node to cancel the rerouting of the source communication link; the second message is sent by the network side device when the part of the link after rerouting by the first IAB node is congested, the source of the network side device is located on a rerouting link, and the second message is used for indicating the first IAB node to cancel rerouting of a source communication link; wherein, the part of the link after rerouting by the first IAB node is an egress link of the network side device; the flow control message is used to instruct the first IAB node to determine whether to initiate a reroute of a communication link based on a transmission status in an alternative link of the communication link.

The embodiment of the network side device corresponds to the embodiment of the method of the network side device, and all implementation processes and implementation modes of the embodiment of the method can be applied to the embodiment of the network side device and can achieve the same technical effect.

Specifically, the embodiment of the application further provides a network side device. As shown in fig. 13, the network-side device 1300 includes: antenna 131, rf device 132, and baseband device 133. The antenna 131 is connected to a radio frequency device 132. In the uplink direction, the rf device 132 receives information through the antenna 131 and sends the received information to the baseband device 133 for processing. In the downlink direction, the baseband device 133 processes information to be transmitted and transmits the processed information to the rf device 132, and the rf device 132 processes the received information and transmits the processed information through the antenna 131.

The above band processing means may be located in the baseband device 133, and the method performed by the network side device in the above embodiment may be implemented in the baseband device 133, where the baseband device 133 includes a processor 134 and a memory 135.

The baseband device 133 may include, for example, at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 13, where one of the chips, for example, the processor 134, is connected to the memory 135 to call up the program in the memory 135 to perform the network side device operation shown in the above method embodiment.

The baseband device 133 may further include a network Interface 136 for exchanging information with the rf device 132, such as Common Public Radio Interface (CPRI).

Specifically, the network side device in the embodiment of the present application further includes: the instructions or programs stored in the memory 135 and executable on the processor 134, and the processor 134 calls the instructions or programs in the memory 135 to execute the methods executed by the modules shown in fig. 9 or fig. 10, and achieve the same technical effects, which are not described herein in detail to avoid repetition.

The embodiments of the present application further provide a readable storage medium, where the readable storage medium may be volatile or non-volatile, and the readable storage medium stores a program or an instruction, where the program or the instruction, when executed by a processor, implement the processes of the foregoing message transmission method for rerouting indication, and can achieve the same technical effects, and in order to avoid repetition, the detailed description is omitted here.

The processor may be the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the above-mentioned message transmission method for rerouting indication, and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip.

An embodiment of the present application further provides a computer program product, where the computer program product is stored in a non-volatile memory, and the computer program product is executed by at least one processor to implement each process of the foregoing message transmission method for rerouting indication, and the same technical effect can be achieved, and in order to avoid repetition, details are not repeated here.

The embodiment of the present application further provides a communication device, configured to execute each process of the foregoing message transmission method for rerouting indication, and can achieve the same technical effect, and for avoiding repetition, details are not repeated here.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, an air conditioner, or a network-side device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A message transmission method for rerouting indication, comprising:

the first IAB node receives at least one of: a first message, a second message, a flow control message;

wherein the first message is sent by a second IAB node on a source communication link when a link that triggers the first IAB node to reroute is congested, and the first message is used for the first IAB node to cancel the rerouting of the source communication link;

the second message is sent by a second IAB node on a rerouted link when congestion occurs in a part of the link after the rerouting by the first IAB node, and the second message is used for indicating the first IAB node to cancel rerouting of a source communication link; wherein, part of the links after the rerouting by the first IAB node are the exit links of the second IAB node;

2. The method of claim 1, wherein the granularity of the source communication link comprises at least one of: each backhaul adaptation protocol, BAP, routing path; each backhaul BH radio link controls the RLC channel; each BH link.

3. The method of claim 1,

the first message and/or the second message is carried by a BAP control Protocol Data Unit (PDU).

4. The method of claim 1, wherein the triggering condition of the first message comprises at least one of:

the congestion state of data transmission corresponding to the BAP routing path is released, a part of links of the BAP routing path are carried by the source communication link, and the congestion state release of the data transmission corresponding to the BAP routing path comprises the following steps: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value;

the congestion state release of data transmission corresponding to a BH RLC channel, where the BH RLC channel is carried by the source communication link, includes: and the available buffer size corresponding to the BH RLC channel is larger than or equal to a first threshold value.

5. The method of claim 4,

before the first IAB node receives the first message, the second IAB node generates and sends a flow control message, wherein the flow control message is used for indicating that the transmission state corresponding to the BAP routing path is a congestion state; and/or

Before the first IAB node receives the first message, the second IAB node generates and sends a flow control message, where the flow control message is used to indicate that the transmission state corresponding to the BH RLC channel is a congestion state.

6. The method of claim 1, wherein the first message comprises at least one of:

an identifier of a corresponding BAP routing path with relieved congestion state for data transmission, wherein part of links of the BAP routing path are carried by the source communication link;

an identifier of a corresponding BH RLC channel for data transmission congestion state relief, wherein the BH RLC channel is carried by the source communication link;

the size of an available cache corresponding to a BAP routing path with relieved congestion state of corresponding data transmission, wherein part of links of the BAP routing path are carried by the source communication link;

and the corresponding available buffer size of the BH RLC channel with the relieved congestion state of the corresponding data transmission is borne by the source communication link.

7. The method of claim 1, wherein the trigger condition of the second message comprises at least one of:

the data transmission corresponding to the BAP routing path is in a congestion state, a part of links of the BAP routing path are carried by the rerouting link, and the congestion state includes: the available cache size corresponding to the BAP routing path is smaller than or equal to a second threshold value;

the data transmission corresponding to the BH RLC channel is in a congestion state, the BH RLC channel is carried by the rerouting link, and the congestion state comprises the following steps: and the available buffer size corresponding to the BH RLC channel is less than or equal to a second threshold.

8. The method of claim 1, wherein the second message comprises at least one of:

corresponding data transmission is carried out on the identification of a BAP routing path in a congestion state, and part of links of the BAP routing path are carried by the rerouting link;

the corresponding data is transmitted with the identification of a BH RLC channel in a congestion state, and the BH RLC channel is carried by the rerouting link;

the size of an available buffer corresponding to a BAP routing path of which the corresponding data transmission is in a congestion state, wherein part of links of the BAP routing path are carried by the rerouting link;

and the corresponding data transmission is in the available buffer size corresponding to the BH RLC channel in the congestion state, and the BH RLC channel is borne by the rerouting link.

9. The method of claim 1, wherein in the case that the first IAB node receives the second message, the method further comprises:

in the event that an alternative link exists for the source communication link, the first IAB node selecting the alternative link as a rerouted link for the source communication link; or

Under the condition that the replaceable link does not exist in the source communication link, the first IAB node cancels the rerouting of the granularity corresponding to the source communication link;

wherein data transmitted over the alternative link or the source communication link supports reaching the same destination node, the alternative link is not in a congested state, and the granularity of the source communication link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

10. The method of claim 9, wherein in the event that the first IAB node cancels rerouting to a granularity corresponding to the source communication link, the method further comprises:

the first IAB node starting a first timer, the first timer being set for each of the granularities;

wherein the first IAB node does not trigger rerouting to a granularity corresponding to the source communication link during the running of the first timer.

11. The method of any of claims 7 to 10, wherein prior to the first IAB node receiving the second message, the method further comprises:

sending a first indication to the second IAB node on the reroute link when the first IAB node reroutes the source communication link, the first indication indicating that the first IAB node rerouted the source communication link.

12. The method of claim 1, wherein in case the flow control message is received by the first IAB node, the method further comprises:

the first IAB node determining a transmission state of the alternative link, the transmission state comprising being in a congested state or not being in a congested state;

the first IAB node determining whether to initiate a reroute of the communication link based on the transmission status of the alternative link, the granularity of the reroute including at least one of: each BAP routing path; each BH RLC channel; each BH link.

13. The method of claim 12, wherein the first IAB node determining whether to initiate rerouting of the communication link based on the transmission status of the alternative link comprises:

in the case that an alternative link which is not in a congestion state exists in the alternative links, starting rerouting of the communication link based on the alternative link which is not in the congestion state;

in the case where there is no alternative link that is not in a congested state among the alternative links, rerouting of the communication link is cancelled.

14. The method of claim 12, wherein the first IAB node determining the transmission status of the alternative link comprises:

the first IAB node determining whether a valid flow control state exists for the alternative link;

in the case that the replaceable link does not have a valid flow control state, the first IAB node sends a flow control polling message to acquire the valid flow control state of the replaceable link; the granularity of the fluidic state includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

15. The method of claim 14, wherein the first IAB node determining whether a valid flow control state exists for the alternative link comprises:

the first IAB node determines whether a second timer corresponding to the replaceable link expires, wherein the granularity of the second timer comprises at least one of: each BH link, each uplink BH link, each downlink BH link, each uplink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each downlink BH link corresponding to a flow control message reported by adopting a BH RLC channel format, each uplink BH link corresponding to a flow control message reported by adopting a BAP routing path format, and each downlink BH link corresponding to a flow control message reported by adopting a BAP routing path format;

determining that a valid flow control state exists for the alternative link if the second timer has not expired.

16. The method of claim 15, further comprising:

the second timer is started when the flow control message corresponding to the replaceable link is received by the first IAB node and/or when the first IAB node is in a non-single link state.

17. The method of claim 1, wherein in the event that the first IAB node opens a reroute of a communication link, the method further comprises:

the first IAB node starts a third timer, and the granularity of the third timer includes at least one of: each BAP routing path; each BH RLC channel; each BH link;

the first IAB node canceling rerouting of the communication link if the third timer expires; the granularity of the backhaul link includes at least one of: each BAP routing path; each BH RLC channel; each BH link.

18. The method of claim 1, wherein the first IAB node, upon receiving the flow control poll message, further comprises at least one of:

generating flow control messages for all egress links;

and generating a flow control message for an egress link on which a fourth timer is not running, wherein the first IAB node is further configured to start the fourth timer after sending the flow control message to the egress link.

19. The method of claim 18, wherein generating the flow control message for the egress link for which the fourth timer is not running comprises:

generating a flow control message for an egress link on which the fourth timer is not running based on the type of the flow control message.

20. The method of claim 1, wherein the first IAB node comprises at least one of: IAB nodes, IAB host distribution unit, DU, nodes.

21. A message transmission method for rerouting indication, comprising:

the second IAB node sends at least one of: a first message, a second message, a flow control message;

wherein the first message is sent by the second IAB node when a link triggering the first IAB node to reroute is congested, the second IAB node being located on a source communication link, the first message being for the first IAB node to reroute the source communication link;

the second message is sent by the second IAB node when the part of the link after rerouting by the first IAB node is congested, the second IAB node source is located on the rerouting link, and the second message is used for instructing the first IAB node to cancel rerouting of a source communication link, where the part of the link after rerouting by the first IAB node is an egress link of the second IAB node;

22. The method of claim 21, wherein the granularity of the source communication link comprises at least one of: each BAP routing path; each BH RLC channel; each BH link.

23. The method of claim 21, wherein the trigger condition of the first message comprises at least one of:

the congestion state release of data transmission corresponding to a BAP routing path, where a part of links of the BAP routing path are carried by the source communication link, includes: the available cache size corresponding to the BAP routing path is larger than or equal to a first threshold value;

24. The method of claim 23, wherein prior to the second IAB node sending the first message, the method further comprises:

the second IAB node generates and sends a flow control message, wherein the flow control message is used for indicating that the transmission state corresponding to the BAP routing path is a congestion state; and/or

And the second IAB node generates and sends a flow control message, wherein the flow control message is used for indicating that the transmission state corresponding to the BH RLC channel is a congestion state.

25. The method of claim 21, wherein the first message comprises at least one of:

corresponding to the identifier of the BAP routing path with relieved congestion state of data transmission, wherein part of the links of the BAP routing path are carried by the source communication link;

the size of an available buffer corresponding to a BAP routing path with relieved congestion state of corresponding data transmission, wherein part of links of the BAP routing path are carried by the source communication link;

26. The method of claim 21, wherein the trigger condition of the second message comprises at least one of:

27. The method of claim 21, wherein the second message comprises at least one of:

corresponding data transmission is carried out on the identification of a BAP routing path in a congestion state, and part of links of the BAP routing path are carried by the rerouting links;

28. The method of claim 26 or 27, wherein before the second IAB node sends the second message, the method further comprises:

the second IAB node receives a first indication indicating that the first IAB node rerouted the source communication link.

29. The method of claim 21, wherein the second IAB node, upon receiving the flow control poll message, further comprises at least one of:

generating flow control messages for all egress links;

and generating a flow control message for an egress link on which a fourth timer is not running, wherein the second IAB node is further configured to start the fourth timer after sending the flow control message to the egress link.

30. The method of claim 29, wherein generating the flow control message for the egress link for which the fourth timer is not running comprises:

and generating the flow control message aiming at the outlet link on which the fourth timer does not run based on the type of the flow control message.

31. A message transmission apparatus for rerouting indications, comprising:

a receiving module, configured to receive at least one of: a first message, a second message, a flow control message;

wherein the first message is sent by a second IAB node on a source communication link under the condition that a link for rerouting by the device is triggered to relieve congestion, and the first message is used for the device node to cancel rerouting of the source communication link;

the second message is sent by a second IAB node on a rerouted link when a portion of the rerouted link of the apparatus is congested, the second message being used to instruct the apparatus node to cancel rerouting of a source communication link; wherein, part of the links after rerouting by the apparatus are the egress links of the second IAB node;

the flow control message is used to instruct the apparatus to determine whether to initiate a rerouting of a communication link based on a transmission status in an alternative link of the communication link.

32. A message transmission apparatus for rerouting indications, comprising:

a sending module, configured to send at least one of the following to the first IAB node: a first message, a second message, a flow control message;

wherein the first message is sent by the apparatus in case of congestion relief for a link that triggers rerouting by the first IAB node, the apparatus being located on a source communication link, the first message being for the first IAB node to cancel rerouting of the source communication link;

the second message is sent by the apparatus when congestion occurs in part of the links after rerouting by the first IAB node, the apparatus source is located on a rerouting link, and the second message is used to instruct the first IAB node to cancel rerouting of a source communication link; wherein, the part of the link after the rerouting by the first IAB node is the egress link of the device;

33. A communications device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing a message transmission method for re-routing indication as claimed in any one of claims 1 to 20 or implementing a message transmission method for re-routing indication as claimed in any one of claims 21 to 30.

34. A readable storage medium, on which a program or instructions are stored, which, when executed by a processor, implement the message transmission method for reroute indication of any one of claims 1 to 20, or the message transmission method for reroute indication of any one of claims 21 to 30.