CN111770563B - Power saving method for wireless access return equipment - Google Patents

Abstract

The invention relates to a power saving method of wireless access return equipment, belonging to the technical field of mobile communication. The method comprises entering a DRX working mode and exiting the DRX working mode; the first process comprises the following steps: entering a DRX working mode; and a second process: exiting the DRX operation mode; the invention provides an IAB working mechanism, which provides conditions for saving electricity for an IAB. The invention selects the DRX discontinuous receiving mode, can support the power saving mode and does not influence the real-time performance of the service. The invention unifies the start time and the cycle time adopted by all the SCTP endpoints of the host to send the heartbeat messages in the IAB-donor. Therefore, small data between the IAB-DU and the IAB-MT can be sent in almost one time, the DRX working mode is facilitated to be transmitted, and the power saving effect of the IAB is improved.

Description

Power saving method for wireless access return equipment

Technical Field

The invention belongs to the technical field of mobile communication, and relates to a power saving method of wireless access backhaul equipment.

Background

Compared with Long Term Evolution (LTE), the New Radio (NR) technology of 5G can use two frequency bands, that is, FR1 and FR2, and the New Radio (NR) technology supports a larger bandwidth, and particularly uses the millimeter wave FR2 frequency band, which facilitates the use of a large-scale antenna and a multi-beam system, so that the New Radio (NR) technology of 5G can provide a higher system rate, and provides conditions for development and application of an IAB base station of 5G NR. An Integrated Access and Backhaul (IAB) base station is formally introduced in 3GPP R16, that is, the base station integrates a wireless Access link and a wireless Backhaul link, where the wireless Access link is a communication link between a UE and the IAB base station, and the wireless Backhaul link is a communication link between the IAB base stations, and provides a data Backhaul path, so that the IAB base station does not need a wired transmission network for data Backhaul. Based on the method, the IAB base station is easier to be deployed in a dense scene, and the burden of deploying a wired transmission network is reduced.

IAB reference architecture (SA mode) provided by 3GPP, as shown in fig. 1. Comprises an IAB-node base station and a plurality of IAB-node base stations. Wherein the IAB-donor base station contains the gbb-DU, the gbb-CU-CP, the gbb-CU-UP and potentially other functionalities. In actual deployment, the IAB-donor base station may be deployed in a centralized or distributed manner based on the above functions.

In the process of deployment, the communication between the IAB-node and the IAB-node is realized in a wireless access backhaul mode, and the communication quality of the wireless access backhaul directly influences the user data transmission capability provided by the IAB-node. In order to complete the wireless access backhaul function, the IAB-node provided by the 3GPP is composed of an IAB-MT and an IAB-DU, the IAB-MT provides wireless access transmission between the IAB-node and a parent node, and the IAB-DU provides wireless access transmission between the IAB-node child nodes. As shown in fig. 2.

As can be seen from fig. 2, the IAB-node not only has the wireless access backhaul function, but also should have the routing selection and maintenance function, so that when the quality of the wireless backhaul signal of the IAB-node is poor or in case of congestion, other routes can be automatically selected to provide the wireless access backhaul function. According to the TS38.300 specification in 3GPP, the IAB-node routing mapping function is provided, and the parent node is responsible for relaying and forwarding the data that the child node needs to return, so that the closer to the IAB-node, the larger the amount of data returned is. As shown in fig. 3.

From the above, regarding the working principle of the wireless access backhaul system, in order to implement the wireless access backhaul function, the link between the IAB-MT and the IAB-DU is always kept in the working state, and in the dense networking scenario, neither the IAB-MT nor the IAB-DU can be in the power-off state. Moreover, each IAB-node returns data without correlation, and the effect of non-continuous receiving is not good. Therefore, in the operation process of the IAB network, the energy consumption of the IAB network is an urgent problem to be solved.

According to the functional requirements of 3GPP standard for IAB-dongle equipment and IAB-DU equipment, terminal data registered to the IAB-DU equipment needs to be transmitted back to the IAB-dongle equipment, a wireless communication link needs to be established between IAB-MT and IAB-DU, and a transmission path for transmitting the IAB-DU equipment data back to the IAB-dongle equipment is provided, so that two paths, namely a stream control transmission protocol (SCTP for short) path for transmitting signaling and a tunneling protocol (GTP-U for short) path for transmitting service data, need to be established between the IAB-DU equipment and the IAB-dongle equipment.

To ensure that the SCTP link between the IAB-donor device and the IAB-DU device is always active, even if there is no data transfer between the two SCTP endpoints, the SCTP periodically sends HEARTBEAT (referred to as a HEARTBEAT BEAT) messages to the peer and waits to receive a HEARTBEAT acknowledgment (referred to as a HEARTBEAT BEAT ACK). In practical engineering, there is no correlation between sending and receiving heartbeat time between an IAB-dongle device and different IAB-DU devices, which causes that discontinuous reception or poor effect cannot be adopted for communication between the IAB-DU device and the IAB-MT device. For example, in fig. 1, if the SCTP heartbeats sent by the IAB-node4 device, the IAB-node5 device, and the IAB-node device are not synchronized, it is inevitable that there is a small amount of data transmission between the IAB-node2 device and the IAB-node device, and the effect of using the wireless resources by the wireless backhaul link is not good, however, in the field of mobile communications, discontinuous reception in the connection mode is the basis of power saving of the system.

Disclosure of Invention

In view of the above, the present invention provides a power saving method for a wireless access backhaul device.

In order to achieve the purpose, the invention provides the following technical scheme:

a power saving method of wireless access backhaul equipment comprises entering DRX operation mode and exiting DRX operation mode;

the first process is as follows: entering DRX mode of operation

Step 11: the IAB-donor and the IAB-node complete the wireless access return networking process according to the protocol requirement of the 3GPP R16 version, and an SCTP link and a GTP-U/GTP-C link are established between the IAB-donor and each IAB-node; the SCTP endpoint in the IAB-donor is called a host SCTP endpoint; the SCTP endpoint in the IAB-node is called a far-end SCTP endpoint;

step 12: the traffic detection module in the IAB-donor equipment monitors the returned traffic data of each IAB-node on a GPRS tunnel protocol user plane GTP-U channel in the IAB-donor equipment and the transmission signaling data on a GPRS tunnel protocol control plane GTP-C channel in real time;

step 13: the traffic detection module judges that the IAB-node can enter an idle mode state if the IAB-node does not monitor the existence of GTP-U return service data in the IAB-node within a period of time and does not detect GTP-C signaling data;

if the traffic detection module detects that data transmission exists on the GTP-U or the GTP-C, the corresponding IAB-node cannot enter an idle mode; returning to the step 12 to continue monitoring;

step 14: the traffic detection module configures start time and cycle time for an idle IAB-node, wherein the start time represents the start time for a host SCTP endpoint in the IAB-node to send heartbeat messages, and the cycle time represents the cycle time for the host SCTP endpoint in the IAB-node to send the heartbeat messages;

step 15: the traffic detection module configures start time and cycle time to a host SCTP endpoint corresponding to the IAB-node in an idle mode, and the host SCTP endpoint periodically sends heartbeat messages to a corresponding remote SCTP endpoint according to the configured start time and cycle time and waits for the remote SCTP endpoint to reply heartbeat confirmation;

step 16: after the IAB-donor configuration is finished and the corresponding host SCTP endpoint starts to send the heartbeat time and the cycle time, configuring an IAB-node father node of an idle IAB-node, wherein the IAB-node of a child node can enter an idle mode; the father node IAB-node receives the message and configures the IAB-MT of the idle node IAB-node to enter a DRX working mode through the IAB-DU of the node;

and step 17: the IAB-node in the idle mode can forward the heartbeat message sent by the SCTP endpoint of the host only in the active state of the DRX working mode or the heartbeat confirmation message replied by the far-end IAB-node; in the non-activated state of the DRX working mode, an IAB-node which needs to send heartbeat messages or heartbeat confirmation messages can only wait for the DRX working activated state time to be forwarded; the IAB-node is in an inactive state under the DRX working mode and can be in a power saving mode;

and a second process: exiting DRX mode of operation

Step 21: if the IAB-node enters an idle mode, a terminal residing in the idle IAB-node or a child node thereof does not have any data transmission, the wireless transmission between the IAB-node and a parent node IAB-node enters a DRX mode;

step 22: the IAB-node receives a paging request from a core network, and then the IAB-node sends the paging request to a corresponding IAB-node by adopting an active state of a DRX working mode, and then the IAB-node sends a paging message on a corresponding paging channel according to paging contents;

step 23: and the IAB-node or the IAB-node receives the return data from the child node IAB-node in the activation state of the DRX working mode, and all IAB-nodes are passed in the return configuration process of the IAB-node to exit the DRX working mode.

Optionally, the method is implemented in a scenario of one IAB-node and 5 IAB-nodes, that is, IAB-node1, IAB-node2, IAB-node3 are child nodes of the IAB-node, and the IAB-node is a parent node of the IAB-node; IAB-node2 is the parent node of IAB-node4 and IAB-node5, and IAB-node4 and IAB-node5 are the child nodes of IAB-node 2; the IAB-DU and the IAB-MT in the father node are linked by a wireless interface, and the method specifically comprises the following steps:

process 1: IAB-MT enters DRX working mode

Step 111: after IAB networking is completed, F1 links are respectively established between an IAB-node and IAB-node2 and IAB-node4, wherein an F1 link between the IAB-node and IAB-node4 needs to establish a wireless channel between an IAB-DU of IAB-node2 and an IAB-MT of IAB-node4, and F1 interface data corresponding to IAB-node4 is returned in a wireless mode;

step 112: if the terminal residing on the IAB-node4 is performing traffic transmission, then a backhaul bandwidth channel is needed between the IAB-DU of the IAB-node2 and the IAB-MT of the IAB-node 4; if a plurality of terminals carry out services, the data of the terminals are uploaded to a father node IAB-node2 through a return channel and forwarded to an IAB-node through an IAB-node2 relay;

in the traffic detection module in the IAB-donor device, the data transmitted on the F1 interfaces corresponding to IAB-node2 and IAB-node4, that is, the F1AP data carried by SCTP, the service data carried by GTP-U, and the GTP-C signaling data; assuming that the IAB-node receives less than kbyte/s on the F1 interface corresponding to IAB-node4 within a certain time T, assuming that the time T is 10 seconds, and assuming that the flow is 1000 bytes/s, the traffic detection module in the IAB-node considers that IAB-node4 has entered the idle mode, otherwise, it continues to monitor the data transmitted on the F1 port;

step 113: detecting that the IAB-node enters an idle mode by the IAB-node, and assuming that the IAB-node4 enters the idle mode in the embodiment; the traffic detection module generates a start time and a cycle time, and in this embodiment, it may be assumed that the system frame number SFN is 1000 or a fixed time reference offset is set to the IAB-donor, and a heartbeat message is sent once every 10 seconds and configured to the host SCTP endpoint corresponding to the IAB-node, so that the IAB-node4 corresponds to the host SCTP endpoint in the IAB-donor and sends the heartbeat start time and the cycle time;

step 114: the IAB-donor also informs the host SCTP endpoint of sending the heartbeat starting time and the heartbeat cycle time through an F1 interface between the IAB-donor and the IAB-node 2; the IAB-DU in the IAB-node2 reconfigures the IAB-MT resource of the IAB-node4 and enters a DRX working mode;

step 115: sending heartbeat messages to a far-end SCTP endpoint of IAB-node4 at a periodic time interval at the beginning time of a host SCTP endpoint in the IAB-donor; and waiting for the SCTP endpoint at the remote end to reply the heartbeat acknowledgment message;

step 116: the IAB-node2 receives the heartbeat message sent by the IAB-node to the IAB-node4, sends the heartbeat message to the IAB-MT in the DRX work activation period of the IAB-MT of the IAB-node4, and forwards the heartbeat message received by the IAB-MT to the SCTP endpoint at the far end of the IAB-DU in the IAB-node 4; the far-end SCTP endpoint immediately replies a heartbeat confirmation after receiving the heartbeat;

and (2) a process: IAB-MT exits DRX working mode

Step 221: an IAB-node4 node in an idle mode, wherein a DRX working mode is adopted between an IAB-DU of an IAB-node2 and an IAB-MT of an IAB-node 4; establishing a finished F1 interface link between the IAB-donor and the IAB-DU;

step 222: detecting data on an F1 interface by a traffic detection module in the IAB-donor, wherein the data specifically comprises data on a GTP-U/GTP-C and SCTP link; if the data flow exceeds a certain threshold, assuming that the data flow is defined as 2000 bytes/second in the embodiment, the IAB-node considers that the IAB-node4 node exits the idle mode, and determines that a terminal residing on the IAB-node4 initiates a service process and needs to transmit service data;

step 223: a traffic detection module in the IAB-node informs a host SCTP endpoint corresponding to the IAB-node4 of the start time and the cycle time for canceling the sending of the heartbeat message;

step 224: and the IAB-node informs the IAB-node of exiting the idle mode through an F1 interface (an F1 interface between the IAB-node and the IAB-node 2), and an IAB-DU in the IAB-node2 reconfigures IAB-MT wireless resources in the IAB-node and exits the DRX working mode.

The invention has the beneficial effects that:

firstly, the method comprises the following steps: in the 5G wireless access backhaul system, a complete power saving mechanism is not provided, and also in the actual working process from the 5G IAB networking, there is no idle mode between the IAB-DU and the IAB-MT, and only a connection mode exists, and neither the IAB-donor nor the IAB-node can enter the idle mode regardless of whether there is a user in the process of activating a service. The invention provides an IAB working mechanism, which provides conditions for saving electricity for the IAB.

Secondly, the method comprises the following steps: in the IAB-node and the IAB-node, when a wireless link between the IAB-DU and the IAB-MT is in continuous receiving and sending, the power saving effect is optimal, but the wireless link does not accord with the working target of the IAB networking, the wireless transmission between the IAB-DU and the IAB-MT enters a connection mode from an idle mode, the required time is long, and the real-time performance of the service is influenced.

Thirdly, the method comprises the following steps: in the IAB networking, a host SCTP endpoint in an IAB-donor and an SCTP endpoint in an IAB-node send heartbeat messages periodically when no data is transmitted, but the heartbeat sending time and the period of each SCTP connection have no correlation, so that an IAB-DU and an IAB-MT cannot well enter a DRX working mode. The invention unifies the start time and cycle time adopted by all the host SCTP endpoints sending the heartbeat messages in the IAB-donor. The data between the IAB-DU and the IAB-MT are sent in almost one time, the DRX working mode is facilitated to be transmitted, and the power saving effect of the IAB is improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a 3GPP recommended IAB reference architecture (SA mode);

FIG. 2 is a parent node and child node relationship in an IAB-node;

FIG. 3 is a diagram of routing and BH RLC channel selection in the BAP sublayer;

FIG. 4 is a schematic diagram of a wireless access backhaul supporting power saving mode;

fig. 5 shows the wireless backhaul system entering DRX mode of operation;

FIG. 6 is a diagram illustrating the wireless backhaul system exiting DRX mode of operation;

FIG. 7 is an IAB networking architecture;

FIG. 8 is a diagram of a protocol architecture supporting F1-U protocol in IAB-node;

FIG. 9 is a diagram of a protocol architecture in an IAB-node that supports the F1-C protocol;

FIG. 10 is a protocol structure diagram of the NAS and RRC connections of the IAB-MT;

FIG. 11 shows the IAB-MT entering DRX mode of operation;

FIG. 12 shows the IAB-MT exiting DRX mode of operation.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation configuration and operation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to specific situations.

In order to more clearly illustrate the application of the present invention in a specific IAB networking process, a case of using one IAB-donor node and 5 IAB-node nodes is described below. IAB-node1, IAB-node2, IAB-node3 are children of IAB-donor, and IAB-donor are parents thereof. IAB-node2 is a parent node of IAB-node4 and IAB-node5, and IAB-node4 and IAB-node5 are child nodes of IAB-node 2. The IAB-DU and the IAB-MT in the father node are in transmission linkage by adopting a wireless interface. If the 5G wireless access backhaul is adopted, the wireless backhaul link is realized by adopting a 5G communication mode, and if the 4G wireless access backhaul is adopted, the wireless backhaul link is realized by adopting a 4G communication mode. As shown in particular in fig. 7.

According to the definition requirements of 3GPP, specifically referring to the description of TS38.300, an F1 interface exists between an IAB-donor and an IAB-node, the F1 interface will support SCTP and GTP-U/GTP-C data (including service data and signaling data) transmission, the F1 interface supports a protocol structure of a user plane as shown in fig. 8, and the F1 interface supports a protocol structure of a control plane as shown in fig. 9. In addition, the structure of the signaling control protocol between the IAB-DU in the parent IAB-node and the IAB-node child IAB-MT is shown in fig. 10. And the IAB-MT and the IAB-DU relay by adopting a wireless backhaul mode. The IAB-donor and the IAB-node are connected through an F1 interface, and an F1 interface carries the contents of GTP-U/GTP-C and F1 AP.

In order to support the normal operation of the IAB networking, enough wireless backhaul resources are provided between the IAB-MT and the IAB-DU for relaying the F1AP and GTP-U data on the F1 interface, no user performs traffic transmission even if no user resides on the IAB-node, and the F1 interface is in an idle state, where the SCTP carrying the F1AP interface also needs to periodically send heartbeat messages to the opposite end and wait for the opposite end to reply to the heartbeat acknowledgment message to check whether the link is normal and the link quality. And the IAB-MT also carries out uplink and downlink synchronization between the IAB-DU and the IAB-MT when receiving and sending the heartbeat message and the heartbeat confirmation message.

Normally, the SCTP endpoints in the IAB-donor and each IAB-node operate independently, so even when the IAB-donor and IAB-node in idle mode are sending and receiving heartbeat messages, there is no correlation in time. Resulting in that there is always a small amount of packet transmission between the IAB-MT and the IAB-DU, even if the IAB-node has no traffic data transmission. Therefore, the IAB-node cannot enter the power saving mode all the time or the power saving effect is poor.

According to the method of the invention, a traffic detection module is added in the IAB-node, the module monitors the data transmission condition on the F1 interface in real time, if the traffic detection module does not receive data returned from the IAB-node on GTP-U/GTP-C in a period of time, or only heartbeat messages and heartbeat confirmation messages exist on an SCTP link, the traffic detection module requests the corresponding IAB-node to enter an idle mode. And the traffic detection module generates a start time and a cycle time for sending the heartbeat message by the SCTP endpoint. The IAB-donor configures the determined start time and the period time on the parent node of the corresponding idle IAB-node through an F1AP interface. And the IAB-node father node performs resource reconfiguration on the idle node IAB-MT through the IAB-DU and requests the IAB-DU of the father node and the IAB-MT of the idle IAB-node to perform a DRX working mode.

In this embodiment, the requirements according to the present invention relate to two main procedures, the IAB-MT entering into DRX operation mode and the IAB-MT exiting DRX operation mode.

Process 1: IAB-MT enters DRX working mode

Step 1: after IAB networking is completed, F1 links are respectively established between the IAB-node and the IAB-node2 and the IAB-node4, wherein the F1 link between the IAB-node and the IAB-node4 needs to establish a wireless channel between the IAB-DU of the IAB-node2 and the IAB-MT of the IAB-node4, and F1 interface data corresponding to the IAB-node4 is returned in a wireless mode. As shown in steps 1, 2 and 3 in fig. 11.

Step 2: if a terminal residing on IAB-node4 is transmitting traffic, then a corresponding backhaul bandwidth channel is needed between the IAB-DU of IAB-node2 and the IAB-MT of IAB-node 4. If a plurality of terminals are in service, the data of the terminals are uploaded to the parent node IAB-node2 through the return channel and forwarded to the IAB-node through the relay of IAB-node 2.

And a traffic detection module in the IAB-donor device detects data (F1 AP data carried by SCTP, service data carried by GTP-U and GTP-C signaling data) transmitted on F1 interfaces corresponding to the IAB-node2 and the IAB-node 4. Assuming that the IAB-node receives traffic of less than kbyte/s (assuming 1000 bytes/s) on the F1 interface corresponding to IAB-node4 within a certain time T (assuming 10 seconds), the traffic detection module in the IAB-node considers that IAB-node4 can enter the idle mode, otherwise, it continues to monitor the data transmitted on the F1 port. As shown in steps 4 and 5 in fig. 11.

And step 3: the IAB-node detects that there is an IAB-node entering idle mode, assuming in this embodiment that IAB-node4 enters idle mode. The traffic detection module generates a start time and a cycle time, and in this embodiment, it may be assumed that the system frame number SFN starts at 1000 (or is a fixed time reference offset of the IAB-donor), and the heartbeat message is sent once every 10 seconds and configured to the host SCTP endpoint corresponding to the IAB-node, so that the IAB-node4 corresponds to the start time and the cycle time of sending the heartbeat by the host SCTP endpoint corresponding to the IAB-donor. As shown in steps 6 and 7 in fig. 11.

And 4, step 4: the IAB-donor also informs the host SCTP endpoint of the heartbeat start time and cycle time sent over the F1 interface between the IAB-donor and the IAB-node 2. The IAB-DU in the IAB-node2 reconfigures the IAB-MT resource of the IAB-node4 and enters a DRX working mode. As shown in steps 8, 9 and 10 in fig. 11.

And 5: the host SCTP endpoint in the IAB-donor sends heartbeat messages to the far end SCTP endpoint of IAB-node4 at a start time, at periodic intervals. And waits for the remote SCTP endpoint to reply to the heartbeat acknowledgment message. As shown in steps 11 and 14 of fig. 11.

Step 6: the IAB-node2 receives the heartbeat message sent by the IAB-node to the IAB-node4, sends the heartbeat message to the IAB-MT in the DRX work activation period of the IAB-MT of the IAB-node4, and forwards the heartbeat message received by the IAB-MT to the SCTP endpoint at the far end of the IAB-DU in the IAB-node 4. The far-end SCTP endpoint replies with a heartbeat acknowledgment immediately after receiving it. As shown in fig. 11 at steps 12 and 13.

And (2) a process: IAB-MT exits DRX working mode

Step 1: the DRX work mode is adopted between the IAB-DU of the IAB-node2 and the IAB-MT of the IAB-node4 of the IAB-node4 node in the idle mode. A completion F1 interface link is established between the IAB-donor and the IAB-DU. As shown in steps 1, 2 and 3 in fig. 12.

Step 2: and detecting data on an F1 interface by a traffic detection module in the IAB-donor, wherein the data specifically comprises data on GTP-U/GTP-C and SCTP links. If the data flow exceeds a certain threshold, assuming that the definition in this embodiment is 2000 bytes/sec, the IAB-node considers that the IAB-node4 node can exit the idle mode, and determines that a terminal residing on the IAB-node4 initiates a service process and needs to perform service data transmission. As shown in steps 4 and 5 in fig. 12.

And step 3: and a traffic detection module in the IAB-node informs a host SCTP endpoint corresponding to the IAB-node4 of the start time and the cycle time for canceling the heartbeat message. As shown in step 6 of fig. 12.

And 4, step 4: and the IAB-node informs the IAB-node of exiting the idle mode through an F1 interface (an F1 interface between the IAB-node and the IAB-node 2), and an IAB-DU in the IAB-node2 reconfigures IAB-MT wireless resources in the IAB-node and exits the DRX working mode. As shown in steps 7 and 8 in fig. 12.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (2)

1. A power saving method for a wireless access backhaul device, comprising: the method comprises entering a DRX working mode and exiting the DRX working mode;

the first process is as follows: entering DRX mode of operation

Step 11: the IAB-donor and the IAB-node complete the wireless access return networking process according to the protocol requirement of the 3GPP R16 version, and an SCTP link and a GTP-U/GTP-C link are established between the IAB-donor and each IAB-node; the SCTP endpoint in the IAB-donor is called a host SCTP endpoint; the SCTP endpoint in the IAB-node is called a far-end SCTP endpoint;

step 12: the traffic detection module in the IAB-donor equipment monitors the returned traffic data of each IAB-node on a GPRS tunnel protocol user plane GTP-U channel in the IAB-donor equipment and the transmission signaling data on a GPRS tunnel protocol control plane GTP-C channel in real time;

step 13: the traffic detection module judges that the IAB-node can enter an idle mode state if the IAB-node does not monitor the existence of GTP-U return service data in the IAB-node within a period of time and does not detect GTP-C signaling data;

if the traffic detection module detects that data transmission exists on the GTP-U or the GTP-C, the corresponding IAB-node cannot enter an idle mode; returning to the step 12 to continue monitoring;

step 14: the traffic detection module configures start time and cycle time for an idle IAB-node, wherein the start time represents the start time for a host SCTP endpoint in the IAB-node to send heartbeat messages, and the cycle time represents the cycle time for the host SCTP endpoint in the IAB-node to send the heartbeat messages;

step 15: the traffic detection module configures start time and cycle time to a host SCTP endpoint corresponding to the IAB-node in an idle mode, and the host SCTP endpoint periodically sends heartbeat messages to a corresponding remote SCTP endpoint according to the configured start time and cycle time and waits for the remote SCTP endpoint to reply heartbeat confirmation;

step 16: after the IAB-donor configuration is finished and the corresponding host SCTP endpoint starts to send the heartbeat time and the cycle time, configuring an IAB-node father node of an idle IAB-node, wherein the IAB-node of a child node can enter an idle mode; the father node IAB-node receives the message and configures the IAB-MT of the idle node IAB-node to enter a DRX working mode through the IAB-DU of the node;

and step 17: the IAB-node in the idle mode can forward the heartbeat message sent by the SCTP endpoint of the host only in the active state of the DRX working mode or the heartbeat confirmation message replied by the far-end IAB-node; in the non-activated state of the DRX working mode, an IAB-node which needs to send heartbeat messages or heartbeat confirmation messages can only wait for the activated state time of the DRX working mode to be forwarded; the IAB-node is in an inactive state under the DRX working mode and can be in a power saving mode;

and a second process: exiting DRX mode of operation

Step 21: if the IAB-node enters the idle mode, the terminal residing in the idle IAB-node or the child node thereof has no data transmission, the wireless transmission between the IAB-node and the parent node IAB-node enters the DRX working mode;

step 22: the IAB-node receives a paging request from a core network, and then the IAB-node sends the paging request to a corresponding IAB-node by adopting an active state of a DRX working mode, and then the IAB-node sends a paging message on a corresponding paging channel according to paging contents;

step 23: and the IAB-node or the IAB-node receives the return data from the sub-node IAB-node in the activation state of the DRX working mode, and the IAB-node passing through the configuration return process of the IAB-node exits the DRX working mode.

2. The power saving method of claim 1, wherein: the method is under the scene of one IAB-node and 5 IAB-nodes, namely IAB-node1, IAB-node2, IAB-node3 are child nodes of the IAB-node, and the IAB-node is a father node of the IAB-node; IAB-node2 is the parent node of IAB-node4 and IAB-node5, and IAB-node4 and IAB-node5 are the child nodes of IAB-node 2; the IAB-DU and the IAB-MT in the father node are linked by a wireless interface, and the method specifically comprises the following steps:

process 1: IAB-MT enters DRX working mode

Step 111: after IAB networking is completed, F1 links are respectively established between an IAB-node and IAB-node2 and IAB-node4, wherein an F1 link between the IAB-node and IAB-node4 needs to establish a wireless channel between an IAB-DU of IAB-node2 and an IAB-MT of IAB-node4, and F1 interface data corresponding to IAB-node4 is returned in a wireless mode;

step 112: if the terminal residing on the IAB-node4 is performing traffic transmission, then a backhaul bandwidth channel is needed between the IAB-DU of the IAB-node2 and the IAB-MT of the IAB-node 4; if a plurality of terminals carry out services, the data of the terminals are uploaded to a father node IAB-node2 through a return channel and forwarded to an IAB-node through an IAB-node2 relay;

in the traffic detection module in the IAB-donor device, the data transmitted on the F1 interfaces corresponding to IAB-node2 and IAB-node4, that is, the F1AP data carried by SCTP, the service data carried by GTP-U, and the GTP-C signaling data; the IAB-donor receives the flow less than 1000 bytes/second on the F1 interface corresponding to the IAB-node4 within a certain time T of 10 seconds, and then a traffic detection module in the IAB-donor considers that the IAB-node4 has entered an idle mode, otherwise, the IAB-donor continues to monitor the data transmitted on the F1 port;

step 113: the IAB-node detects that the IAB-node enters an idle mode, namely the IAB-node4 enters the idle mode; the traffic detection module generates a start time and a cycle time, starts sending a heartbeat message from a fixed time reference offset when a system frame number SFN is 1000 or an IAB-node and sends a heartbeat message every 10 seconds, and configures the heartbeat message to a host SCTP endpoint corresponding to the IAB-node, so that the IAB-node4 sends the heartbeat start time and the cycle time corresponding to the host SCTP endpoint in the IAB-node;

step 114: the IAB-donor also informs the host SCTP endpoint of sending the heartbeat starting time and the heartbeat cycle time through an F1 interface between the IAB-donor and the IAB-node 2; the IAB-DU in the IAB-node2 reconfigures the IAB-MT resource of the IAB-node4 and enters a DRX working mode;

step 115: sending heartbeat messages to a far-end SCTP endpoint of IAB-node4 at a periodic time interval at the beginning time of a host SCTP endpoint in the IAB-donor; and waiting for the SCTP endpoint at the remote end to reply the heartbeat acknowledgment message;

step 116: the IAB-node2 receives the heartbeat message sent by the IAB-node to the IAB-node4, sends the heartbeat message to the IAB-MT in the DRX work activation period of the IAB-MT of the IAB-node4, and forwards the heartbeat message received by the IAB-MT to the SCTP endpoint at the far end of the IAB-DU in the IAB-node 4; after receiving the heartbeat confirmation message, the far-end SCTP endpoint immediately replies a heartbeat confirmation message;

and (2) a process: IAB-MT exits DRX working mode

Step 221: an IAB-node4 node in an idle mode, wherein a DRX working mode is adopted between an IAB-DU of an IAB-node2 and an IAB-MT of an IAB-node 4; establishing a finished F1 interface link between the IAB-donor and the IAB-DU;

step 222: detecting data on an F1 interface by a traffic detection module in the IAB-donor, wherein the data specifically comprises data on a GTP-U/GTP-C and SCTP link; if the data flow exceeds a certain threshold, if the data flow exceeds the threshold of 2000 bytes/second, the IAB-node considers that the IAB-node4 node exits the idle mode, and judges that a terminal residing on the IAB-node4 initiates a service process and needs to transmit service data;

step 223: a traffic detection module in the IAB-node informs a host SCTP endpoint corresponding to the IAB-node4 of the start time and the cycle time for canceling the sending of the heartbeat message;

step 224: and the IAB-node informs the IAB-node of exiting the idle mode through an F1 interface between the IAB-node and the IAB-node2, and the IAB-DU in the IAB-node2 reconfigures IAB-MT wireless resources in the IAB-node and exits the DRX working mode.

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