CN111770563B - A power saving method for wireless access backhaul 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

A power saving method for wireless access backhaul equipment

technical field

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

Background technique

Compared with Long Term Evolution (LTE), 5G New Radio (NR) technology can use two frequency bands, namely FR1 and FR2. 5G NR supports larger bandwidth, especially the millimeter wave FR2 frequency band, which is convenient Using large-scale antennas and multi-beam systems, 5G NR can provide higher system rates, providing conditions for the development and application of IAB base stations for 5G NR. The so-called Integrated Access and Backhaul (IAB) base station was officially introduced in the 3GPP R16 version, that is, the base station integrates a wireless access link and a wireless backhaul link, where the wireless access link is The communication link between the UE and the IAB base station, and the wireless backhaul link is the communication link between the IAB base stations, providing a data backhaul path, so the IAB base station does not need a wired transmission network for data backhaul. Based on this, IAB base stations are easier to deploy in dense scenarios, reducing the burden of deploying wired transmission networks.

The IAB reference architecture (SA mode) provided by 3GPP is shown in Figure 1. Contains one IAB-donor base station and multiple IAB-node base stations. The IAB-donor base station contains gNB-DU, gNB-CU-CP, gNB-CU-UP and potentially other functions. In actual deployment, IAB-donor base stations can be deployed in a centralized or distributed manner based on the above functions.

During the deployment process, the communication between IAB-node and IAB-donor is realized through wireless access backhaul, and the communication quality of wireless access backhaul will directly affect the IAB-node's ability to provide user data transmission. In order to complete the wireless access backhaul function, the IAB-node provided by 3GPP consists of IAB-MT and IAB-DU. IAB-MT provides wireless access transmission between IAB-node and parent node, and IAB-DU provides IAB-node Wireless access transmission between child nodes. as shown in picture 2.

As can be seen from Figure 2, IAB-node not only has the function of wireless access backhaul, but also has routing selection and maintenance functions. When the quality of the wireless backhaul signal of IAB-node is poor or congested, it can automatically select other routes. to provide wireless access backhaul. According to the TS38.300 specification in 3GPP, the route mapping function of the IAB-node has been provided. The parent node is responsible for relaying and forwarding the data that the child node needs to send back. Therefore, the closer the IAB-donor node is to send back the larger the amount of data. . As shown in Figure 3.

From the above about the working principle of the wireless access backhaul system, in order to realize the wireless access backhaul function, the link between the IAB-MT and the IAB-DU is always in a working state, and in a dense networking scenario, the IAB-MT and IAB-DU are in a working state. None of the IAB-DUs can be powered off. And there is no correlation between the data returned by each IAB-node node, and the effect of discontinuous reception is not good. Therefore, during the operation of the IAB network, the energy consumption of the IAB network is an urgent problem to be solved.

According to the functional requirements of IAB-donor equipment and IAB-DU equipment according to the 3GPP standard, the terminal data registered to the IAB-DU equipment needs to be transmitted back to the IAB-donor equipment, and a wireless communication link needs to be established between IAB-MT and IAB-DU It provides a transmission path for IAB-DU equipment data back to IAB-donor equipment, so two paths need to be established between IAB-DU equipment and IAB-donor equipment, that is, the flow control transmission protocol for transmitting signaling ( Abbreviation: SCTP) path and Tunnel Technology Protocol (abbreviation: GTP-U) path for service data transmission.

In order to ensure that the SCTP link between the IAB-donor device and the IAB-DU device is always in an active state, even if there is no data transmission between the two SCTP endpoints, SCTP periodically sends a heartbeat (referred to as: HEART BEAT) message to the peer, and Waiting to receive a heartbeat acknowledgment (short: HEARTBEAT ACK). In actual engineering, there is no correlation between the sending and receiving heartbeat time between the IAB-donor device and different IAB-DU devices, resulting in that the communication between the IAB-DU device and the IAB-MT device cannot use discontinuous reception or the effect is not good. good. For example, in Figure 1, if the heartbeat sent by SCTP is not synchronized between the IAB-node4 device, the IAB-node5 device and the IAB-donor device, it will inevitably cause a small amount of data transmission between the IAB-node2 device and the IAB-donor device. The wireless backhaul link is not effective in using wireless resources. However, in the field of mobile communication, the use of discontinuous reception in the connection mode is the basis for system power saving.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a power saving method for a wireless access backhaul device.

To achieve the above object, the present invention provides the following technical solutions:

A power saving method for wireless access backhaul equipment, the method includes entering a DRX working mode and exiting the DRX working mode;

Process 1: Enter DRX working mode

Step 11: IAB-donor and IAB-node complete the wireless access backhaul networking process according to the 3GPP R16 version protocol requirements, and establish SCTP links and GTP-U/GTP- C link; SCTP endpoint in IAB-donor is called host SCTP endpoint; SCTP endpoint in IAB-node is called remote SCTP endpoint;

Step 12: The traffic detection module in the IAB-donor device monitors the backhaul service data of each IAB-node node and the GPRS tunneling protocol control plane GTP-U channel on the GPRS tunneling protocol user plane GTP-U channel in the IAB-donor device in real time. Transmission of signaling data on the C channel;

Step 13: If the traffic detection module does not monitor that the IAB-node node has GTP-U return service data within a period of time, nor does it detect the GTP-C signaling data, it is determined that the IAB-node can enter the idle mode state;

If the traffic detection module detects that there is data transmission on GTP-U or GTP-C, the corresponding IAB-node cannot enter idle mode; return to step 12 to continue monitoring;

Step 14: The traffic detection module configures the start time and cycle time for the idle IAB-node nodes. The start time indicates the start time of the host SCTP endpoint in the IAB-donor sending the heartbeat message, and the cycle time indicates the host SCTP endpoint in the IAB-donor sends the heartbeat message. The cycle time of the heartbeat message;

Step 15: The traffic detection module configures the start time and cycle time to the host SCTP endpoint corresponding to the IAB-node in idle mode, and the host SCTP endpoint periodically sends a heartbeat message to the corresponding IAB-node according to the configured start time and cycle time. The remote SCTP endpoint, and wait for the remote SCTP endpoint to reply with a heartbeat confirmation;

Step 16: After the IAB-donor configuration is completed and the corresponding host SCTP endpoint starts to send the heartbeat time and cycle time, configure the IAB-node parent node of the idle IAB-node node, and its child node IAB-node can enter the idle mode; the parent node IAB-node When the node receives the message, it configures the IAB-MT of the idle node IAB-node to enter the DRX working mode through the IAB-DU of the node;

Step 17: The IAB-node node in idle mode can forward the heartbeat message sent by the host SCTP endpoint or the heartbeat confirmation message replied by the remote IAB-node only in the active state of the DRX working mode; in the inactive state of the DRX working mode In this case, the IAB-node node that needs to send a heartbeat message or a heartbeat confirmation message can only wait for the DRX working activation state time before forwarding; the IAB-node in the inactive state in the DRX working mode can go into power saving mode;

Process 2: Exit DRX working mode

Step 21: If the IAB-node enters the idle mode, and the terminal residing on the idle IAB-node or its child nodes does not have any data transmission, then the wireless transmission between the IAB-node and the parent node IAB-node will enter the DRX mode;

Step 22: The IAB-donor receives the paging request from the core network, then the IAB-donor adopts the active state of the DRX working mode to send the paging request to the corresponding IAB-node node, and then the IAB-node sends the paging request to the corresponding IAB-node according to the paging content. Send a paging message on the corresponding paging channel;

Step 23: When the IAB-donor or IAB-node node receives the return data from the child node IAB-node in the active state of the DRX working mode, the IAB-donor passes through all the IAB-nodes and exits during the return process. DRX working mode.

Optionally, the method is in the scenario of one IAB-donor node and five IAB-node nodes, that is, IAB-node1, IAB-node2, and IAB-node3 are child nodes of IAB-donor, and IAB-donor is their child node. Parent 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-node2; IAB-DU and IAB-MT in the parent node are linked by wireless interface, Specifically:

Process 1: IAB-MT enters DRX working mode

Step 111: After the IAB networking is completed, F1 links are established between IAB-donor, IAB-node2, and IAB-node4, respectively, and the F1 link between IAB-donor and IAB-node4 A wireless channel is established between the DU and the IAB-MT of the IAB-node4, and the F1 interface data corresponding to the IAB-node4 is returned wirelessly;

Step 112: If the terminal residing on IAB-node4 is in the process of service transmission, then the same response backhaul bandwidth channel is required between the IAB-DU of IAB-node2 and the IAB-MT of IAB-node4; If one terminal performs business, then the data of these terminals will be uploaded to the parent node IAB-node2 through the return channel, and forwarded to IAB-donor through the IAB-node2 relay;

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

Step 113: The IAB-donor detects that there is an IAB-node entering the idle mode, assuming that IAB-node4 enters the idle mode in this embodiment; then the traffic detection module generates the start time and the cycle time, in this embodiment, it can be assumed that the system Frame number SFN=1000 or IAB-donor starts with a fixed time base offset, and sends a heartbeat message every 10 seconds, and configures it to the host SCTP endpoint corresponding to IAB-node, so that IAB-node4 corresponds to IAB-donor. Corresponding host SCTP endpoint sends heartbeat start time and cycle time;

Step 114: IAB-donor also informs the host SCTP endpoint to send heartbeat start time and cycle time through the F1 interface between IAB-donor and IAB-node2; IAB-DU in IAB-node2 reconfigures the IAB-MT resource of IAB-node4 , enter the DRX working mode;

Step 115: The host SCTP endpoint in the IAB-donor sends a heartbeat message to the remote SCTP endpoint of IAB-node4 at periodic time intervals at the start time; and waits for the remote SCTP endpoint to reply the heartbeat confirmation message;

Step 116: IAB-node2 receives the heartbeat message sent by IAB-donor to IAB-node4, sends the heartbeat message to IAB-MT during the DRX work activation period of IAB-MT of IAB-node4, and sends IAB- The heartbeat message received by the MT is forwarded to the remote SCTP endpoint of the IAB-DU; the remote SCTP endpoint returns a heartbeat confirmation immediately after receiving it;

Process 2: IAB-MT exits DRX working mode

Step 221: For the IAB-node4 node in idle mode, the DRX working mode is adopted between the IAB-DU of IAB-node2 and the IAB-MT of IAB-node4; the F1 interface link is established and completed between the IAB-donor and the IAB-DU ;

Step 222: The traffic detection module in the IAB-donor detects the data on the F1 interface, which specifically includes the data on the GTP-U/GTP-C and SCTP links; if the data traffic exceeds a certain threshold, it is assumed that in this embodiment, it is defined as 2000 bytes/second, then IAB-donor considers that the IAB-node4 node has exited the idle mode, and determines that the terminal residing on the IAB-node4 initiates a business process and needs to perform business data transmission;

Step 223: The traffic detection module in the IAB-donor notifies the host SCTP endpoint corresponding to the IAB-node4 to cancel the start time and cycle time of sending the heartbeat message;

Step 224: The IAB-donor informs the IAB-node that it has exited the idle mode through the F1 interface (the F1 interface between the IAB-donor and the IAB-node2), then the IAB-DU in the IAB-node2 will reconfigure the IAB in the IAB-node2 -MT radio resource, exit DRX working mode.

The beneficial effects of the present invention are:

First: In the 5G wireless access backhaul system, there is no complete set of power-saving mechanisms, and from the 5G IAB networking to the actual working process, there is no idle mode between IAB-DU and IAB-MT, only In the connected mode, no matter whether there is a user in the process of activating the service, neither the IAB-donor nor the IAB-node can enter the idle mode. This greatly increases the operating cost of the IAB, and does not meet the requirements of environmental protection and energy consumption. The present invention provides an IAB working mechanism, which provides conditions for the IAB to save power.

Second: In IAB-donor and IAB-node, the wireless link between IAB-DU and IAB-MT is in continuous transmission and reception, and the power saving effect is the best, but this does not meet the goal of IAB networking, IAB-DU The wireless transmission between the IAB-MT and the IAB-MT takes a long time to enter the connection mode from the idle mode, which affects the real-time performance of the service. The present invention chooses to use the DRX discontinuous reception mode, which can support the power saving mode without affecting the service. real-time.

Third: In the IAB networking, the host SCTP endpoint in the IAB-donor and the SCTP endpoint in the IAB-node will periodically send heartbeat messages when there is no data transmission, but the heartbeat sending time of each SCTP connection There is no correlation with the cycle, so that IAB-DU and IAB-MT cannot enter the DRX working mode well. The present invention unifies the start time and cycle time adopted by all host SCTP endpoints that send heartbeat messages in the IAB-donor. The data between the IAB-DU and the IAB-MT is sent almost within a time, which is beneficial to the transmission in the DRX working mode and improves the power saving effect of the IAB.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be preferably described in detail below with reference to the accompanying drawings, wherein:

Figure 1 shows the IAB reference architecture (SA mode) recommended by 3GPP;

Figure 2 shows the parent node and child node relationship in IAB-node;

Fig. 3 is about routing and BH RLC channel selection diagram in the BAP sublayer;

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

Figure 5 shows that the wireless backhaul system enters the DRX working mode;

Figure 6 shows the wireless backhaul system exiting the DRX working mode;

Figure 7 shows the IAB networking structure;

Figure 8 is a diagram of the protocol architecture supporting the F1-U protocol in IAB-node;

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

Fig. 10 is the protocol structure diagram of NAS and RRC connection of IAB-MT;

Figure 11 shows the IAB-MT entering the DRX working mode;

Figure 12 shows the IAB-MT exiting the DRX working mode.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Among them, the accompanying drawings are only used for exemplary description, and represent only schematic diagrams, not physical drawings, and should not be construed as limitations of the present invention; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, The enlargement or reduction does not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar numbers 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 are terms “upper”, “lower”, “left” and “right” , "front", "rear" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must be It has a specific orientation, as well as a specific orientation structure and operation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation of the present invention. situation to understand the specific meaning of the above terms.

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 five IAB-node nodes is described below. IAB-node1, IAB-node2, IAB-node3 are child nodes of IAB-donor, and IAB-donor is their parent 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-node2. The IAB-DU and IAB-MT in the parent node use the wireless interface for transmission link. If 5G wireless access and backhaul is used, the wireless backhaul link is realized by 5G communication. If 4G wireless access and backhaul is used, the wireless backhaul link is realized by 4G communication. Specifically as shown in Figure 7.

According to the definition requirements of 3GPP, refer specifically to the description of TS38.300, there is an F1 interface between IAB-donor and IAB-node, and the F1 interface will support SCTP and GTP-U/GTP-C data (including service data and signaling Figure 8 shows the protocol structure of the F1 interface supporting the user plane, and the protocol structure that the F1 interface supports the control plane is shown in Figure 9. In addition, the structure of the signaling control protocol between the IAB-DU in the parent node IAB-node and the IAB-node child node IAB-MT is shown in FIG. 10 . Wireless backhaul is used for relay between IAB-MT and IAB-DU. The IAB-donor and the IAB-node are connected through the F1 interface, and the F1 interface carries the contents of GTP-U/GTP-C and F1AP.

In order to support the normal operation of IAB networking, sufficient wireless backhaul resources are provided between IAB-MT and IAB-DU for relaying F1AP and GTP-U data on the F1 interface, even if they do not reside on the IAB-node Any user, and no user performs service transmission, the F1 interface is in an idle state, and the SCTP carrying the F1AP interface also needs to periodically send heartbeat messages to the peer, and wait for the peer to reply with a heartbeat confirmation message to check whether the link is normal and the link quality. When IAB-MT sends and receives heartbeat messages and heartbeat confirmation messages, it also performs uplink and downlink synchronization between IAB-DU and IAB-MT at the same time.

Under normal circumstances, the SCTP endpoints in the IAB-donor and each IAB-node work independently, so even if the IAB-donor and IAB-node in idle mode send and receive heartbeat messages, there is no time correlation. As a result, even if the IAB-node has no service data transmission, there is always a small amount of data packet transmission between the IAB-MT and the IAB-DU. As a result, the IAB-node cannot enter the power saving mode all the time, or the power saving effect is not good.

According to the method of the present invention, a traffic detection module is added to the IAB-donor, which monitors the data transmission on the F1 interface in real time. The data is returned on the C, or there are only heartbeat messages and heartbeat confirmation messages on the SCTP link, then the traffic detection module requests the corresponding IAB-node node to enter the idle mode. The traffic detection module generates the start time and cycle time for the SCTP endpoint to send the heartbeat message. The IAB-donor will determine the start time and cycle time on the parent node of the corresponding idle IAB-node through the F1AP interface. The parent node of the IAB-node reconfigures the resources of the idle node IAB-MT through the IAB-DU, and requests the IAB-DU of the parent node and the IAB-MT of the idle IAB-node node to perform the DRX working mode.

In this embodiment, two main procedures are involved in accordance with the requirements of the present invention, the IAB-MT entering the DRX operating mode and the IAB-MT exiting the DRX operating mode.

Process 1: IAB-MT enters DRX working mode

Step 1: After the IAB networking is completed, F1 links are established between IAB-donor, IAB-node2 and IAB-node4, respectively. The F1 link between IAB-donor and IAB-node4 needs to be in the IAB-DU of IAB-node2. A wireless channel is established between the IAB-MT of the IAB-node4, and the F1 interface data corresponding to the IAB-node4 is returned wirelessly. Steps 1, 2, and 3 in Figure 11.

Step 2: If the terminal residing on the IAB-node4 is performing service transmission, a corresponding backhaul bandwidth channel is required between the IAB-DU of the IAB-node2 and the IAB-MT of the IAB-node4. If there are multiple terminals performing services, the data of these terminals will be uploaded to the parent node IAB-node2 through the return channel, and forwarded to the IAB-donor through the IAB-node2 relay.

The traffic detection module in the IAB-donor device detects the data transmitted on the F1 interface corresponding to IAB-node2 and IAB-node4 (F1AP data carried by SCTP, service data carried by GTP-U and GTP-C signaling data) ). Assuming that the IAB-donor receives less than K bytes/s (assumed 1000 bytes/s) traffic on the F1 interface corresponding to IAB-node4 within a certain time T (assumed to be 10 seconds), then the traffic in the IAB-donor The detection module thinks that IAB-node4 can enter the idle mode, otherwise it continues to monitor the data transmitted on the F1 port. Steps 4 and 5 in Figure 11.

Step 3: The IAB-donor detects that the IAB-node enters the idle mode, assuming that the IAB-node4 enters the idle mode in this embodiment. Then the traffic detection module generates the start time and cycle time. In this embodiment, it can be assumed that the system frame number SFN=1000 (or a fixed time reference offset of IAB-donor) starts, and a heartbeat is sent at an interval of 10 seconds. The message is configured to the host SCTP endpoint corresponding to the IAB-node, so that the IAB-node4 sends the heartbeat start time and cycle time corresponding to the host SCTP endpoint in the IAB-donor. Steps 6 and 7 in Figure 11.

Step 4: IAB-donor also informs the host SCTP endpoint to send heartbeat start time and cycle time through the F1 interface between IAB-donor and IAB-node2. The IAB-DU in IAB-node2 reconfigures the IAB-MT resource of IAB-node4 and enters the DRX working mode. Steps 8, 9, and 10 in Figure 11.

Step 5: The host SCTP endpoint in the IAB-donor sends a heartbeat message to the remote SCTP endpoint of IAB-node4 at periodic intervals at the start time. And wait for the remote SCTP endpoint to reply with a heartbeat confirmation message. Steps 11 and 14 in Figure 11.

Step 6: IAB-node2 receives the heartbeat message sent by IAB-donor to IAB-node4, sends the heartbeat message to IAB-MT during the DRX work activation cycle of IAB-MT of IAB-node4, and sends IAB- The heartbeat message received by the MT is forwarded to the remote SCTP endpoint of the IAB-DU. The remote SCTP endpoint immediately replies with a heartbeat acknowledgment after receiving it. Steps 12 and 13 in Figure 11.

Process 2: IAB-MT exits DRX working mode

Step 1: For the IAB-node4 node in idle mode, the DRX working mode is adopted between the IAB-DU of IAB-node2 and the IAB-MT of IAB-node4. The F1 interface link is established between the IAB-donor and the IAB-DU. Steps 1, 2, and 3 as shown in Figure 12.

Step 2: The traffic detection module in the IAB-donor detects the data on the F1 interface, which specifically includes the data on the GTP-U/GTP-C and SCTP links. If the data flow exceeds a certain threshold, assuming that it is defined as 2000 bytes/second in this embodiment, the IAB-donor considers that the IAB-node4 node can exit the idle mode, and determines that the terminal residing on the IAB-node4 initiates a business process, which requires Carry out business data transmission. Steps 4 and 5 in Figure 12.

Step 3: The traffic detection module in the IAB-donor notifies the host SCTP endpoint corresponding to the IAB-node4 to cancel the start time and cycle time of sending the heartbeat message. Step 6 in Figure 12.

Step 4: IAB-donor informs IAB-node through F1 interface (F1 interface between IAB-donor and IAB-node2) that it can exit idle mode, then IAB-DU in IAB-node2 will reconfigure IAB in IAB-node -MT radio resource, exit DRX working mode. Steps 7 and 8 in Figure 12.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should all be included in the scope of 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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