Node in wireless communication system, user equipment and method performed by same

Abstract

The invention provides a node in a wireless communication system, user equipment and a method performed by the same. A method performed by a first node in a wireless communication system, comprising: generating a rule for data transmission and / or discard using protocol data unit set importance (PSI) when a second node needs to discard data; and sending indication information to the second node, the indication information indicating the rule. According to the method provided by the embodiment of the invention, network congestion can be effectively relieved or solved, and the service experience of a user is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wireless communications, and more particularly, to a node, a user equipment and a method executed by the node in a wireless communication system. Background Art

[0002] In order to meet the increased demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems."

[0003] Wireless communication is one of the most successful innovations in modern history. The number of subscribers to wireless communication services recently exceeded 5 billion and continues to grow rapidly. The demand for wireless data services is growing rapidly due to the increasing popularity of smartphones and other mobile data devices (e.g., tablets, laptops, netbooks, e-book readers, and machine-type devices) among consumers and enterprises. In order to meet the high growth of mobile data services and support new applications and deployments, it is critical to improve the efficiency and coverage of the wireless interface.

[0004] Compared with 4G, 5G communication technology has a faster transmission speed, so it can provide users with more types of communication services. Extended reality (XR) business is regarded as a key application service to promote the development of 5G technology. It is a general term for the three major business types of augmented reality (AR), virtual reality (VR), and mixed reality (MR). XR business has high requirements for transmission speed and latency, so more network resources are needed to support the normal operation of the business. At the same time, for the portability of XR devices, the size of the battery is greatly limited, and how to reduce energy consumption has also become a considerable challenge. Therefore, in order to improve the user experience of XR users, it is necessary to conduct more in-depth research on reducing power consumption, increasing network capacity, and improving XR perception. Summary of the invention

[0005] An embodiment of the present disclosure provides a method executed by a first node in a wireless communication system, comprising: generating a rule for applying a protocol data unit set importance (PSI) to transmit and / or discard data when a second node needs to discard data; and sending indication information to the second node, wherein the indication information indicates the rule.

[0006] According to an embodiment of the present disclosure, the rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; transmitting a protocol data unit (PDU) set whose PSI is greater than or greater than or equal to the first threshold; a PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted first; transmitting the PDU set according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; for multiple PDU sets with the same PSI, the PDU set with a smaller data volume is transmitted first; when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, the PDU sets with the association are transmitted first; and when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the PDU sets with the association are transmitted first.

[0007] According to an embodiment of the present disclosure, the indication information is sent in one or more of the following ways: the indication information is carried in a GPRS tunneling protocol user plane GTP-U header and sent; and the indication information is sent via a NG application protocol NGAP message.

[0008] According to an embodiment of the present disclosure, the method further includes: sending fourth information to the second node, wherein the fourth information indicates information related to the effective time of the rule.

[0009] According to an embodiment of the present disclosure, the method also includes receiving one or more of the following from a second node: first information, wherein the first information suggests that the first node configure a first PSI for an associated protocol data unit PDU set; second information, wherein the second information suggests that the first node not place associated data on different PDU sets or suggests that the first node place associated data on the same PDU set; and third information, wherein the third information indicates that congestion is currently occurring at the second node.

[0010] According to an embodiment of the present disclosure, the method further includes: sending fifth information to the second node, wherein the fifth information includes a mapping relationship between the PSI and the protocol data unit PDU set.

[0011] An embodiment of the present disclosure provides a method performed by a second node in a wireless communication system, comprising: receiving a scheduling request SR and / or a buffer status report BSR from a user equipment UE, wherein the SR and / or BSR are received through a first format or a first logical channel or through a second format or a second logical channel based on a protocol data unit set importance PSI of a protocol data unit PDU set corresponding to the SR and / or BSR; and sending an uplink grant to the UE.

[0012] According to an embodiment of the present disclosure, when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is greater than or greater than or equal to a fourth threshold, the SR and / or BSR is received through a first format or a first logical channel; and when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is less than or less than or equal to the fourth threshold, the SR and / or BSR is received through a second format or a second logical channel.

[0013] An embodiment of the present disclosure provides a method executed by a second node in a wireless communication system, comprising: receiving indication information from a first node, wherein the indication information indicates a rule for applying a protocol data unit set importance (PSI) to perform data transmission and / or discard when the second node needs to discard data; and performing data transmission and / or discard based on the rule.

[0014] According to an embodiment of the present disclosure, the rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; transmitting a protocol data unit (PDU) set whose PSI is greater than or greater than or equal to the first threshold; a PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted first; transmitting the PDU set according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; for multiple PDU sets with the same PSI, the PDU set with a smaller data volume is transmitted first; when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, the PDU sets with the association are transmitted first; and when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the PDU sets with the association are transmitted first.

[0015] According to an embodiment of the present disclosure, the indication information is sent in one or more of the following ways: the indication information is carried in a GPRS tunneling protocol user plane GTP-U header and sent; and the indication information is sent via a NG application protocol NGAP message.

[0016] According to an embodiment of the present disclosure, the method further includes: receiving fourth information from the first node, wherein the fourth information indicates information related to the effective time of the rule.

[0017] According to an embodiment of the present disclosure, the method also includes sending one or more of the following to the first node: first information, wherein the first information suggests that the first node configure a first PSI for an associated protocol data unit PDU set; second information, wherein the second information suggests that the first node not place associated data on different PDU sets or suggests that the first node place associated data on the same PDU set; and third information, wherein the third information indicates that congestion is currently occurring at the second node.

[0018] According to an embodiment of the present disclosure, the method also includes: receiving fifth information from the first node, wherein the fifth information includes a mapping relationship between the PSI and the protocol data unit PDU set; and sending the mapping relationship between the PSI and the protocol data unit PDU set to a user equipment UE.

[0019] An embodiment of the present disclosure provides a method performed by a second node in a wireless communication system, comprising: sending a handover request message to a third node; receiving a handover request confirmation message from the third node, wherein the handover request confirmation message includes a second DRX configuration configured by the third node for a user equipment UE; and sending a handover command to the UE, wherein the handover command includes the second DRX configuration.

[0020] According to an embodiment of the present disclosure, the handover request confirmation message further includes a triggering condition for applying the second DRX configuration, and wherein the handover command further includes the triggering condition.

[0021] According to an embodiment of the present disclosure, the trigger condition includes one or more of the following: triggering the second DRX configuration after the UE switches to the third node; triggering the second DRX configuration after the UE switches to the third node and a first time period has passed; and triggering the second DRX configuration after the UE switches to the third node and receives trigger information sent by the third node.

[0022] According to an embodiment of the present disclosure, the handover request message includes the first DRX configuration configured by the second node for the UE and / or the third DRX configuration desired by the UE.

[0023] An embodiment of the present disclosure provides a method performed by a user equipment UE in a wireless communication system, comprising: sending a scheduling request SR and / or a buffer status report BSR to a second node; and receiving an uplink authorization from the second node; wherein the SR and / or BSR are sent through a first format or a first logical channel or through a second format or a second logical channel based on a protocol data unit set importance PSI of a protocol data unit PDU set corresponding to the SR and / or BSR.

[0024] According to an embodiment of the present disclosure, when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is greater than or greater than or equal to a fourth threshold, the SR and / or BSR is sent by the UE through a first format or a first logical channel; and when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is less than or less than or equal to the fourth threshold, the SR and / or BSR is sent by the UE through a second format or a second logical channel.

[0025] According to an embodiment of the present disclosure, the method further includes: sending the fourth threshold to the second node.

[0026] According to an embodiment of the present disclosure, the method also includes: receiving a switching command from the second node, wherein the switching command includes a second DRX configuration configured for the UE by a third node as a switching target node, wherein the second DRX configuration is received by the second node from the third node.

[0027] According to an embodiment of the present disclosure, the switching command also includes a triggering condition for applying the second DRX configuration.

[0028] According to an embodiment of the present disclosure, the trigger condition includes one or more of the following: triggering the second DRX configuration after the UE switches to the third node; triggering the second DRX configuration after the UE switches to the third node and a first time period has passed; and triggering the second DRX configuration after the UE switches to the third node and receives trigger information sent by the third node.

[0029] An embodiment of the present disclosure provides a node in a wireless communication system, comprising: a transceiver configured to send and receive signals; and a controller coupled to the transceiver and configured to execute any method performed by a first node or a second node in the wireless communication system according to an embodiment of the present disclosure.

[0030] An embodiment of the present disclosure provides a user equipment UE in a wireless communication system, comprising: a transceiver configured to send and receive signals; and a controller coupled to the transceiver and configured to execute any method performed by the user equipment UE in the wireless communication system according to an embodiment of the present disclosure.

[0031] An embodiment of the present disclosure provides a computer-readable medium having computer-readable instructions stored thereon, which, when executed by a processor, are used to implement any method performed by a first node or a second node or a user equipment UE in a wireless communication system according to an embodiment of the present disclosure.

[0032] The method provided by the embodiments of the present disclosure and executed by the first node and / or the second node and / or the user equipment in the wireless communication system can effectively alleviate or solve the network congestion and improve the service experience of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is an exemplary system architecture of System Architecture Evolution (SAE);

[0035] Figure 2 is an exemplary system architecture according to various embodiments of the present disclosure;

[0036] Figure 3a An exemplary structure of a base station according to an embodiment of the present disclosure is shown;

[0037] Figure 3b An exemplary structure of a base station according to an embodiment of the present disclosure is shown;

[0038] Figure 3c An exemplary structure of a base station according to an embodiment of the present disclosure is shown;

[0039] Figure 4 An example mapping scenario between a PDU set, a PSI, and a QoS flow according to an embodiment of the present disclosure is shown;

[0040] Figure 5 An example flow chart showing a CN sending indication information to a RAN according to an embodiment of the present disclosure is shown;

[0041] Figure 5a An example diagram showing that the RAN adds the congestion level in the GTP-U header in a per QoS flow manner according to an embodiment of the present disclosure;

[0042] Figure 5bAnother example diagram showing that the RAN adds the congestion level in the GTP-U header in a per QoS flow manner according to an embodiment of the present disclosure;

[0043] Figure 6 An example flow chart of cell switching performed by a UE according to an embodiment of the present disclosure is shown;

[0044] Figure 7 Another example flow chart of cell switching performed by a UE according to an embodiment of the present disclosure is shown;

[0045] Figure 8 A flowchart of a method performed by a first node in a wireless communication system according to an embodiment of the present disclosure is shown;

[0046] Figure 9a A flowchart of a method performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown;

[0047] Figure 9b A flow chart of a method performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown;

[0048] Fig.9c A flowchart of a method performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown;

[0049] Fig.10 A flowchart of a method performed by a user equipment UE in a wireless communication system according to an embodiment of the present disclosure is shown;

[0050] Fig.11 A schematic diagram of a node in a wireless communication system according to an embodiment of the present disclosure is shown; and

[0051] Fig.12 A schematic diagram of a user equipment in a wireless communication system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0052] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should be considered as exemplary only. Therefore, one of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0053] The terms and expressions used in the following specification and claims are not limited to their dictionary meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined in the appended claims and their equivalents.

[0054] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0055] The term "include" or "may include" refers to the presence of the corresponding disclosed functions, operations or components that can be used in various embodiments of the present disclosure, rather than limiting the presence of one or more additional functions, operations or features. In addition, the term "include" or "have" may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0056] The term "or" used in various embodiments of the present disclosure includes any of the listed terms and all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0057] Unless defined differently, all terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as understood by those skilled in the art described in the present disclosure. Common terms as defined in dictionaries are interpreted as having meanings consistent with the context in the relevant technical field, and should not be interpreted ideally or overly formally unless clearly defined in the present disclosure.

[0058] The following discussion Figures 1 to 12 The various embodiments used to describe the principles of the present disclosure in this patent document are for illustration only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0059] Figure 1It is an exemplary system architecture 100 of System Architecture Evolution (SAE). User Equipment (UE) 101 is a terminal device used to receive data. Evolved Universal Terrestrial Radio Access Network (E-UTRAN) 102 is a radio access network, which includes a macro base station (eNodeB / NodeB) that provides a wireless network interface for the UE to access. The Mobility Management Entity (MME) 103 is responsible for managing the mobility context, session context and security information of the UE. The Serving Gateway (SGW) 104 mainly provides user plane functions, and the MME 103 and SGW 104 may be in the same physical entity. The Packet Data Network Gateway (PGW) 105 is responsible for functions such as billing and lawful interception, and may also be in the same physical entity as the SGW 104. The Policy and Charging Rules Function Entity (PCRF) 106 provides Quality of Service (QoS) policies and charging criteria. The General Packet Radio Service Support Node (SGSN) 108 is a network node device that provides routing for data transmission in the Universal Mobile Telecommunications System (UMTS). The Home Subscriber Server (HSS) 109 is the home subsystem of the UE and is responsible for protecting user information including the current location of the user equipment, the address of the service node, user security information, and the packet data context of the user equipment.

[0060] Figure 2 is an exemplary system architecture 200 according to various embodiments of the present disclosure. Other embodiments of the system architecture 200 can be used without departing from the scope of the present disclosure.

[0061] User equipment (UE) 201 is a terminal device used to receive data. Next generation radio access network (NG-RAN) 202 is a radio access network, which includes a base station (gNB or eNB connected to the 5G core network 5GC, eNB connected to 5GC is also called ng-gNB) that provides UE with access to a wireless network interface. Access control and mobility management function (Access and Mobility Management Function, AMF) 203 is responsible for managing the mobility context and security information of the UE. User plane function (UPF) 204 mainly provides user plane functions. Session management function SMF 205 is responsible for session management. Data Network (Data Network, DN) 206 includes services such as operators, Internet access and third-party services.

[0062] In the NR system, in order to support network function virtualization, more efficient resource management and scheduling, the base station (gNB / ng-eNB) providing a wireless network interface for the terminal (UE) can be further divided into a centralized unit (e.g., gNB-CU / ng-eNB-CU (gNB central unit / ng-eNB central unit)) and a distributed unit (e.g., gNB-DU / ng-eNB-DU (gNB distributed unit / ng-eNB distributed unit)) (referred to as CU and DU in this disclosure), such as Figure 3a As shown. gNB-CU has radio resource control (RRC), service data adaptation protocol (SDAP) and packet data convergence protocol (PDCP) protocol layers, and ng-eNB-CU has RRC and PDCP layers. gNB-DU / ng-eNB-DU has radio link control protocol (RLC), media access control (MAC) and physical layer (PHY), etc. There is a standardized public interface F1 between gNB-CU and gNB-DU, and a standardized public interface W1 between ng-eNB-CU and ng-eNB-DU. The F1 interface is divided into control plane F1-C and user plane F1-U. The transmission network layer of F1-C is based on IP transmission. In order to transmit signaling more reliably, the stream control transmission protocol (SCTP) protocol is added on top of IP. The protocol of the application layer is F1 Application Protocol (F1AP). SCTP can provide reliable application layer message transmission. The transport layer of F1-U is UDP / IP, and the GPRS tunneling protocol user plane (GTP-U) is used to carry the user plane protocol data unit PDU on top of UDP / IP. Furthermore, for gNB-CU, Figure 3bAs shown, the gNB-CU may include gNB-CU-CP (control plane part of the centralized unit of the base station) and gNB-CU-UP (user plane part of the centralized unit of the base station). The gNB-CU-CP includes the control plane function of the base station, and has RRC and PDCP protocol layers. The gNB-CU-UP includes the user plane function of the base station, and has SDAP and PDCP protocol layers. The standardized public interface E1 is used between the gNB-CU-CP and the gNB-CU-UP, and the protocol is the E1 Application Protocol (E1AP). The interface between the control plane part of the centralized unit of the base station and the distributed unit of the base station is the F1-C interface, i.e., the control plane interface of F1. The interface between the user plane part of the centralized unit of the base station and the distributed unit of the base station is the F1-U interface, i.e., the user plane interface of F1. In addition, in the NR system, the base station that provides the E-UTRA user plane and control plane accessing the 5G core network is called ng-eNB. In order to support virtualization, this base station (ng-eNB) can also be further divided into a centralized unit ng-eNB-CU (gNB central unit / ng-eNB central unit) and a distributed unit ng-eNB-DU (gNB distributed unit / ng-eNB distributed unit) (referred to as CU and DU in this disclosure), such as Figure 3c As shown. ng-eNB-CU has RRC and PDCP layers. gNB-DU / ng-eNB-DU has radio link control protocol (RLC), media access control (MAC) and physical layer, etc. There is a standardized public interface W1 between ng-eNB-CU and ng-eNB-DU. The W1 interface is divided into control plane W1-C and user plane W1-U. The transport network layer of W1-C is based on IP transmission. In order to transmit signaling more reliably, the SCTP protocol is added on top of IP. The protocol of the application layer is W1 Application Protocol (W1AP). The transport layer of W1-U is UDP / IP, and GTP-U is used to carry user plane protocol data unit PDU on top of UDP / IP.

[0063] In order to better carry out research in the XR field, the concept of PDU set is proposed. A PDU set consists of one or more PDUs. A PDU set can be a frame (aframe) or a video slice (a videoslice) in an XR service. A PDU set can only be mapped to one quality of service flow (QoS flow), and the relevant parameters of all PDU sets on a QoS flow, such as PDU Set Delay Budget (PSDB), PDU Set Error Rate (PSER) and PDU Set Integrated Handling Indication (PSIHI) are the same. If network congestion occurs on the RAN side, how to discard and / or transmit the PDU set is a problem. Therefore, one of the purposes of the present disclosure is to solve the above-mentioned technical problems and propose a method for applying PSI on the RAN side for data transmission (or packet loss).

[0064] Different PDU sets may have different importance levels, which can be represented by the protocol data unit set importance (PSI) (for example, its value may be high / medium / low, or 0-7, etc., but not limited thereto), and different PDU sets on the same QoS flow may also have different PSIs. The PSI may be told to the radio access network (RAN) by the UPF through the GTP-U header. When network congestion occurs on the RAN side, the corresponding PDU set may be discarded according to the PSI value (for example, some PDU sets with smaller PSI values ​​may be discarded), thereby alleviating or resolving network congestion.

[0065] Based on the mapping relationship between PDU sets, PSIs, and QoS flows, four different scenarios can be summarized:

[0066] Scenario 1: Multiple PDU sets are mapped to one QoS flow;

[0067] Scenario 2: Multiple PDU sets are mapped to different QoS flows;

[0068] Scenario 3: Multiple PDU sets have different PSIs;

[0069] Scenario 4: The PSIs of some PDU sets in multiple PDU sets are the same.

[0070] Figure 4 An example mapping scenario between a PDU set, a PSI, and a QoS flow according to an embodiment of the present disclosure is shown. Figure 4In the present invention, the core network (CN) (for example, CN node, hereinafter referred to as CN) sends a PDU set to the RAN side (for example, RAN node, hereinafter referred to as RAN), and the RAN side puts PDU set1 with PSI=1 (PDU set1 with PSI=1) and PDUset2 with PSI=3 (PDU set2 with PSI=3) on QoS flow 1 (QoS flow1) and sends them to the UE, and puts PDU set3 with PSI=3 (PDU set3 with PSI=3) and PDU set4 with PSI=5 (PDU set4 with PSI=5) on QoS flow 2 (QoSflow2) and sends them to the UE. PDU set2 and PDU set3 with the same PSI are mapped to different QoS flows respectively.

[0071] Exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.

[0072] The text and drawings are provided as examples only to help understand the present disclosure. They should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art based on what is disclosed herein that the embodiments and examples shown may be changed without departing from the scope of the present disclosure.

[0073] Before introducing the specific content, some assumptions and definitions of the present disclosure are given below.

[0074] The message names in this disclosure are only examples, and other message names may also be used.

[0075] The “first”, “second”, etc. included in the message names in the present disclosure are just examples of messages and are only used to distinguish between messages, and do not represent the execution order.

[0076] Detailed descriptions of steps irrelevant to the present disclosure are omitted in the present disclosure.

[0077] In the present disclosure, the steps in various aspects, methods, and processes can be performed in combination with each other or individually. The execution steps of each process are only examples and do not exclude other possible execution orders.

[0078] In the present disclosure, the base station may be a 5G base station (such as gNB, ng-eNB), a 4G base station (such as eNB), a 6G base station, or other types of access nodes.

[0079] In the present disclosure, transmission of data refers to receiving and / or sending of data.

[0080] In the present disclosure, a core network (CN) node may be referred to as a first node, and may include a core network device in any existing or future wireless communication system, such as an access control and mobility management function entity (AMF), a session management function entity (SMF), a user plane function entity (UPF), or a policy control function entity (PCF), etc. A radio access network (RAN) node may be referred to as a second node, and may include various base stations, a centralized unit of a base station, a distributed unit of a base station, a control plane of a centralized unit of a base station, a user plane of a centralized unit of a base station, various cells (e.g., a serving cell of a UE, a source cell for handover, a target cell, etc.), etc., as described above.

[0081] First aspect: CN instructs RAN how to apply PSI for data transmission (or packet loss)

[0082] In some implementations, the CN may send an indication message to the RAN, indicating that when congestion occurs (or when data needs to be discarded), the PSI is applied according to the indicated rules to perform data transmission (or data discard, data packet discard, or PDU set discard, etc.). Examples of the information carried in the indication message and the corresponding rules are listed below. The CN may indicate one or several rules to the RAN, and the RAN may apply one of the rules, or apply multiple rules at the same time, to use the PSI for data transmission (or packet discard). In this article, packet discard may be a PDU set discard. Figure 5 An example flow chart of CN sending indication information to RAN according to an embodiment of the present disclosure is shown.

[0083] like Figure 5 As shown, in step 501, the CN may receive or determine one or more rules for applying the PDU set importance PSI for data transmission by any method, and the specific determination method is not limited herein.

[0084] In step 502, the CN may send indication information to the RAN. The indication information may include one or more rules for applying the protocol data unit set importance (PSI) to perform data transmission (for example, when network congestion on the RAN side occurs or when data needs to be discarded).

[0085] In step 503, after receiving one or more rules for applying the PSI for data transmission, the RAN may apply one or more of the rules for data transmission (or data packet discarding, or PDU set discarding, etc.).

[0086] An example implementation of the information carried in the indication information and the corresponding rules may be as follows:

[0087] One implementation manner may be: the indication information carries a first threshold, and indicates that a PDU set whose PSI is less than or less than or equal to the first threshold may be directly discarded; or indicates that a PDU set whose transmission PSI is greater than or greater than or equal to the first threshold;

[0088] Another implementation manner may be: the indication information carries a second threshold, and indicates that a PDU set whose PSI is greater than or greater than or equal to the second threshold is preferentially transmitted; for example, a PDU set whose PSI is greater than or greater than or equal to the second threshold has a higher priority, and a PDU set with a higher priority is preferentially transmitted;

[0089] Another implementation method may be: the indication information indicates that the size of the PSI value is proportional to the transmission priority, that is, the PDU set with the largest PSI value has the highest transmission priority and will be transmitted first; the PDU set with the second largest PSI value has the second highest transmission priority and will be transmitted after the PDU set with the largest PSI value is transmitted, and so on. That is, the PDU set is transmitted according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set;

[0090] Another implementation may be: the indication information indicates that for multiple PDU sets with the same PSI, a PDU set with the smallest or smaller size (or data volume) is preferentially transmitted;

[0091] Another implementation manner may be: the indication information indicates that when multiple PDU sets are mapped to different QoS flows, if the different QoS flows are associated (for example, different QoS flows include associated PDU sets), the associated PDU sets on the different QoS flows are preferentially transmitted, and the influence of the PSI value on the transmission priority is not considered at this time;

[0092] o Optionally, the indication information may carry a third threshold value. When the PSI value of the associated PDU set is greater than (or greater than or equal to) the third threshold value, the associated PDU set will be transmitted preferentially. At this time, the transmission priority of the PDU set is higher than that of a PDU set with a higher PSI value but no association.

[0093] In some embodiments, any threshold value described herein (e.g., the first threshold value, the second threshold value, the third threshold value, etc.) may be predetermined, agreed upon by protocol, or indicated by any other message or signaling, and may not be carried by the indication information.

[0094] In some implementations, the priority or transmission priority of the PDU set described above may be agreed upon by a protocol or indicated by any message or signaling.

[0095] In some implementations, the CN may send the indication information to the RAN in the following ways:

[0096] The indication information can be carried in the GTP-U header. In this case, the indication information is only valid for the current PDU set.

[0097] The CN can send indication information to the RAN via the NG interface (e.g., via NGAP messages), and a new NG Application Protocol (NGAP) can be defined.

[0098] The message may also reuse an existing NGAP message, for example, by adding it to a PDU session resource setup request (PDU session resource setup request) for sending, which is not limited here; here, the NG interface may be an interface between a base station and a core network;

[0099] o Optionally, the message may carry a timer to indicate to the RAN that the indication information (or one or more rules indicated by the indication information) is valid within the timer, that is, information related to the validity time of the indication information (or one or more rules indicated by the indication information) (for example, a valid time interval, etc.) is indicated by means of a timer;

[0100] o Optionally, information related to the validity period of the indication information (or one or more rules indicated by the indication information) may also be sent separately to indicate the start and end of the validity period of the indication information to the RAN.

[0101] In this document, the information indicating the effective time of the one or more rules may also be referred to as fourth information. The fourth information may be present in the same information, message or signaling as the one or more rules, or may be present in different information, message or signaling than the one or more rules. The fourth information may include at least one of the following: effective start time (which may be sent together with effective end time or separately), effective end time, effective time interval, etc.

[0102] Second aspect: RAN feeds back auxiliary information to CN

[0103] When RAN is congested, if the PDU set that needs to be discarded is associated with one or more other PDU sets, then if one of these associated PDU sets is lost, there is no need to transmit the remaining PDU sets, because the associated PDU sets need to be successfully transmitted before they can be decoded normally. Therefore, if a PDU set is discarded, all PDU sets associated with the PDU set need to be discarded. Such packet loss will have a great impact on the user experience, and serious delays, freezes, or frame losses may occur at the XR device terminal. However, at this time, the CN does not perceive whether the RAN is congested, and may still set the mapping relationship between the PDU set and the corresponding PSI according to the original rules, which is not conducive to alleviating and improving the problem.

[0104] In some implementations, for example, when RAN is congested, RAN may send auxiliary information to CN, and CN may change the mapping relationship between PDU set and PSI based on the auxiliary information, or change the corresponding relationship between data packet (or data) and PDU set, or change the policy and charging control rule (PCCrule) to alleviate the problem that user experience is greatly affected by packet loss. Specific example implementations related to auxiliary information may include one or more of the following:

[0105] One implementation may be: when congestion occurs in the RAN, auxiliary information (for example, first information, which may also be first auxiliary information) is sent to the CN, suggesting that the CN configure a higher PSI value, such as the first PSI, for the associated PDU set. For example, it may be suggested that the CN configure the PSI of the associated PDU set to have a higher value than the PSI of the non-associated PDU set. In this way, when the RAN performs packet loss, it will not easily lose the PDU set with association (also referred to as correlation). In some implementations, the first PSI may be high, medium, or greater than a threshold. In some implementations, the first PSI may be a value higher than the existing PSI.

[0106] Another implementation may be: when RAN is congested, auxiliary information (e.g., second information, which may also be second auxiliary information) is sent to the CN, suggesting that the CN not place associated data (also referred to as data packets in this document) in different PDU sets, and / or suggesting that the CN place associated data in the same PDU set. In this way, even if a PDU set is discarded, it will not affect other PDU sets.

[0107] Another implementation manner may be: when congestion occurs in the RAN, auxiliary information (for example, third information, which may also be third auxiliary information) is sent to the CN to indicate that the CN RAN is currently congested.

[0108] o RAN can provide congestion feedback to CN at the granularity of QoS flow, UE, or cell, i.e., it can provide congestion feedback at the granularity of per QoS flow or per UE.

[0109] The congestion status may be indicated to the CN in a per UE or per cell manner. The congestion status may be whether congestion occurs and / or the degree of congestion (or congestion level), etc.

[0110] o Optionally, the RAN may indicate its congestion level or congestion class (e.g., low / medium / high

[0111] (low / medium / high) or 0, 1, 2, 3... or the percentage of congested data packets in the total transmitted data packets, etc.), and the CN can select different strategies according to the congestion level of the RAN.

[0112] It should be noted that RAN only provides corresponding suggestions and / or information to CN by feeding back auxiliary information, but whether CN accepts the suggestions made by RAN or whether to adopt relevant policies is determined by CN itself. RAN can send auxiliary information to CN through NG interface, and can define a new NG Application Protocol (NGAP) message, or reuse existing NGAP messages, for example, auxiliary information is added to PDU session resource modify indication or RAN configuration update for sending, which is not limited here. Class 1 procedure can be used to interact with CN, or class 2 procedure can be used to interact with CN, which is not limited here. For example, when RAN feeds back congestion status to CN in a per QoS flow manner, that is, when reflecting the congestion status of data transmission on a certain QoS flow, auxiliary information can be added to PDU session resource modify indication or PDU session resource notification, or added to IP header or GTP-U header, which is not limited here. Figure 5a and Figure 5b Figure 1 shows two different ways that the RAN adds the congestion level in the GTP-U header per QoS flow. Figure 5b In addition to adding the congestion level indication in the reserved field, a new IE flag (New IE Flag) (such as New IE Flag1) in the New IE Flags Octet is also needed to indicate whether the congestion level indication exists.

[0113] Aspect 3: DRX pre-configuration in cell switching

[0114] The present disclosure considers a related solution of applying a discontinuous reception (DRX) mechanism in XR services to reduce power consumption.

[0115] The DRX mechanism can save power for users with periodic services. XR services have strict periodicity, and in order to make XR devices more portable, there are corresponding restrictions on the capacity and size of the battery, which leads to high requirements for energy saving. If the XR device can be in the DRX mechanism for as long as possible, then the DRX mechanism can be used to the greatest extent to save energy. Figure 6 FIG. 1 shows a general flow chart of a current UE performing a cell handover. Figure 6 As shown, if cell1 is a serving cell and cell2 is a target cell (also referred to as a third node in this article), when cell1 decides to switch the UE to cell2, the following steps may be performed:

[0116] 1) Cell1 sends a handover request (HO request) to cell2, requesting that the UE be handed over to cell2;

[0117] 2) If Cell2 agrees to the handover, it replies to Cell1 with a handover request ACK (HO request ACK)

[0118] information;

[0119] 3) After receiving the ACK message, Cell1 sends a handover command (HO command) to the UE;

[0120] 4) When the UE receives the HO command, if the UE is in the DRX mechanism, it will exit the DRX mechanism after receiving the HO command and perform RRC reconfiguration. After the RRC reconfiguration is completed, it sends an RRC reconfiguration completion (RRCReconfigComplete) to cell2;

[0121] 5) After Cell2 receives RRCReconfigComplete, it means that the UE switching is completed. At this time, cell2 can send DRX related configuration information to the UE.

[0122] It can be seen from the above process that from the time when the UE receives the HO command until the cell2 configures the DRX configuration for the UE, the UE cannot be in the DRX mechanism to save power.

[0123] Therefore, another aspect of the present disclosure focuses on how XR users can maximize the use of the DRX mechanism to save power during cell switching. Figure 7 Another example flow chart of UE performing cell switching according to an embodiment of the present disclosure is shown. The specific steps are as follows:

[0124] 1) When cell1 decides to switch the UE from cell1 to cell2, cell1 sends a HO request to cell2, and carries the first DRX configuration configured by cell1 for the UE (e.g., configurations regarding an onDuration Timer, an inactivity timer, a DRX cycle, etc.), and / or the DRX configuration desired by the UE (e.g., drx-Preference, which may be referred to as a third DRX configuration in this document), for reference by cell2. In some implementations, the first DRX configuration may include one or more DRX configurations configured by cell1 for the UE, for example, multiple DRX cycles, and / or multiple onDuration timers, etc. configured by cell1 for the UE;

[0125] a) Optionally, if cell1 can predict the movement trajectory of the UE, cell1 can know in advance that the UE will be handed over to cell2, so cell1 can interact with cell2 in advance, and cell2 can send the second DRX configuration configured by cell2 for the UE to cell1 through the Xn interface in advance. In this case, it is not necessary to interact with the second DRX configuration through the HO preparation process;

[0126] 2) If cell2 decides to accept the handover request and decides to configure DRX for the UE, it sends a HO request ACK to cell1, and carries the second DRX configuration configured by cell2 for the UE, and / or the triggering condition for applying the second DRX configuration. In some implementations, the second DRX configuration may include one or more DRX configurations configured by cell2 for the UE, for example, multiple DRX cycles configured by cell2 for the UE, and / or multiple on-duration timers, etc. In some implementations, the triggering condition may consist of one or more of the following:

[0127] a) After the UE switches to cell2, the second DRX configuration configured by cell2 is directly triggered. At this time, because the UE can apply DRX immediately after switching to cell2, there is a better power consumption gain;

[0128] b) After the UE switches to cell2, after a first time period, such as the duration of a timer, the second DRX configuration configured by cell2 is triggered. The timer configuration can also be determined by cell2 and added to the HO request ACK message. In this case, the signaling overhead generated by the need for cell2 to configure DRX for the UE separately in the traditional solution can be avoided; in addition, in addition to the timer method, the first time period can also be indicated by other specific messages or fields, which is not limited in this article;

[0129] c) after the UE switches to cell2, the UE triggers the second DRX configuration configured by cell2 after receiving the indication information (or referred to as triggering information) sent by cell2 for triggering the second DRX configuration. The indication information may also indicate which one of the one or more DRX configurations included in the second DRX configuration the UE triggers, for example, may indicate which DRX cycle of multiple DRX cycles configured by cell2 for the UE to trigger, and / or which on-duration timer of multiple on-duration timers configured by cell2 for the UE to trigger;

[0130] 3) After receiving the ACK message sent by cell2, Cell1 sends a HO command to the UE, carrying the second DRX configuration configured by cell2 and / or the triggering condition for applying the second DRX configuration;

[0131] 4) After the UE completes the RRC reconfiguration, it sends RRCReconfigComplete to cell2 and executes the corresponding DRX mechanism according to the triggering conditions.

[0132] In order to better apply DRX technology to XR services, some non-integer DRX cycles (i.e., drx-NonIntegerLongCycle (non-continuous reception-non-integer long cycle) IE and drx-NonIntegerShortCycle (non-continuous reception-non-integer short cycle) IE) are introduced. When the UE is an XR device, the base station can configure a non-integer DRX cycle for the XR UE to match the XR non-integer cycle service. But the problem is that the non-integer DRX cycle is not added to the UE assistance information (UAI, UEAssistance information), that is, the DRX cycle that the UE wants in the UAI (i.e., drx-Preference IE) still does not contain a non-integer DRX cycle. Therefore, when the base station is a CU-DU separation architecture, the DRX cycle IE in the UE Context SetupRequest (UE context establishment request) message sent by the CU to the DU will not include a non-integer DRX cycle, because the DRX cycle in the UEContext Setup Request corresponds to the DRX cycle that the UE wants in the UAI. This will lead to the problem that the DU cannot configure a non-integer DRX cycle for the XR UE. Therefore, the present invention proposes the following embodiments to solve the configuration problem of non-integer DRX cycles in a CU-DU separation architecture.

[0133] In some implementations, when the DU receives a UE Context Setup Request message and / or a UE Context Modification Request message sent by the CU, if the message includes and / or meets at least one of the following IEs and / or conditions in addition to the DRXcycle IE, the DU may configure a non-integer DRX cycle value for the UE in addition to the integer DRX cycle value in the DRXcycle IE, or the DU directly ignores the DRX cycle IE and configures a non-integer DRX cycle value for the UE:

[0134] PDU Set QoS Parameters IE;

[0135] ECN Marking or Congestion Information Reporting Request IE;

[0136] N6 Jitter Information IE;

[0137] TSC Assistance information (Time-Sensitive Communication Assistance Information) IE in Periodicity

[0138] (Periodicity) and / or Burst Arrival Time (burst arrival time) conform to the XR service cycle characteristics, or Periodicity and / or Burst Arrival Time are non-integer values;

[0139] ·UAI ul-TrafficInfo (uplink traffic information) IE complies with the XR service cycle characteristics

[0140] Other service parameters that can let the DU know that the UE is an XR UE;

[0141] When the DU configures a non-integer DRX cycle for the UE, it may refer to the Periodicity and / or Burst Arrival Time in the TSC Assistance information IE, or may refer to other referenced service parameters, which are not limited here.

[0142] In some other implementations, a new IE may be defined in the UE Context Setup Request message and / or the UE Context Modification Request message sent by the CU to the DU. The new IE may be called a newDRX cycle IE, or an extended DRX cycle IE, or other names, which are not limited here. When the UE is an XR UE, or the DRX cycle value desired by the UE is a non-integer, the CU adds the newly defined IE to the UE Context Setup Request message and / or the UE Context Modification Request message and sends it to the DU. The new IE content may include at least one of the following:

[0143] All configurable DRX cycle values, including integer DRX cycle values ​​and non-integer DRX cycle values;

[0144] Non-integer DRX cycle value;

[0145] The non-integer DRX cycle value desired by the UE;

[0146] The DRX cycle value desired by the UE, including the desired integer DRX cycle value and the desired non-integer DRX cycle value;

[0147] Fourth aspect: mapping relationship between PSI and PDU set

[0148] In some implementations, the CN may determine the priority / importance of the PDU set based on the delay budget, error rate, or other related parameters of the PDU set. The priority / importance may be represented by a PSI, and the mapping relationship between the PSI and the PDU set follows corresponding rules, such as a PDU Priority Mark (PPM) rule or a Policy and Charging Control Rule (PCC rule). The PPM rule may be told to the UE by the CN through the N1 SM container during the establishment or modification of the PDU session, so that the UE may use the PPM rule to transmit the uplink PDU set. However, if the CN tells the UE in this way, the RAN will not perceive the PPM rule. The PCC rule is determined by the Policy Control Function (PCF) according to the service requirements provided by the Application Function (AF), and part of the PCC rule is told to the SMF, and the RAN side will not perceive the specific PCC rule. If the RAN can also obtain the PPM rule and / or PCC rule, it will be more conducive to the allocation and scheduling of uplink PDU set resources. Therefore, the present disclosure proposes another notification method of PPM and / or PCC rules, and the specific steps are as follows:

[0149] 1) First, the CN may inform the RAN of the mapping relationship between the PSI and the PDU set (for example, the PPM rule or the PCC rule) through the core network assistance information (hereinafter referred to as the fifth information), and the RAN side may then perceive the mapping rule between the PSI and the PDU set; it should be understood that the mapping relationship between the PSI and the PDU set or the PPM rule or the PCC rule may also be informed to the RAN through other NGAP messages (hereinafter referred to as the fifth information), which is not limited here;

[0150] 2) After receiving the core network auxiliary information, RAN tells the PPM rule and / or PCC rule to UE. At this time, both RAN and UE can know the PPM rule and / or PCC rule;

[0151] o The RAN can send it to the UE through an RRC message; it can also be broadcast through a system information (SI) message. There is no restriction on which message the RAN uses to inform the UE.

[0152] In this article, mapping rules and mapping relationships can be used interchangeably.

[0153] In some embodiments, the UE can correspond the uplink PDU set and the corresponding PSI based on the mapping relationship between the PSI and the PDU set. When sending the uplink PDU set, the PSI can be included in the PDU set header. The base station can perform data transmission, resource scheduling, data discard, etc. based on the PSI.

[0154] Fifth aspect: mapping relationship between SR / BSR and PSI / LCH

[0155] In some embodiments, when the UE has uplink data to send, the UE will first send a scheduling request (SR) or a buffer status report (BSR) to the base station, so that the base station can allocate uplink resources for the UE, for example, sending an uplink grant (UL grant) to the UE. For example, when the UE has uplink data to send, it can send an SR to the base station through the physical uplink control channel (PUCCH). After the base station detects the SR, it knows that the UE has uplink data to send, and then sends an uplink grant (UL grant) to the UE to allocate uplink resources. Subsequently, the UE sends a BSR on the allocated resources through the physical uplink shared channel (PUSCH) to notify the base station of the amount of uplink data to be sent. Based on the BSR, the base station then sends an uplink grant (UL grant) to the UE to allocate appropriate uplink resources for the UE to send uplink data. In NR, the UE can also omit the process of sending the SR and directly send the BSR to the base station through the PUCCH to request the resources required to send the uplink data, thereby reducing the transmission delay of the uplink data. After receiving the SR or BSR sent by the UE, the base station may allocate uplink resources to the UE according to its own situation, which may result in insufficient uplink resources to transmit all uplink data. When the base station does not know the importance of the uplink data, it may not configure uplink resources for the UE in a timely manner. However, the delay and the size of the uplink resources allocated by the network are very important for XR services. If the scheduling delay is too large or the uplink data transmission delay increases due to insufficient configured uplink resources, if the corresponding packet delay budget (PDB) or PDU set delay budget (PSDB) requirements are exceeded, the uplink data to be sent may be discarded, resulting in uplink data transmission failure and reduced user experience.

[0156] On the other hand, the present disclosure proposes a corresponding solution to solve the problem. An example implementation may be:

[0157] After the UE knows the PPM rule and / or the PCC rule, it can know the mapping relationship between the uplink PDU set and the PSI. When the PSI value corresponding to the PDU set to be transmitted is greater than (or greater than or equal to) the fourth threshold, the UE can use a new SR / BSR format (for example, a new format (newformat) or a dedicated format (specific format), which may be referred to as the first format in this article)

[0158] To send the SR / BSR corresponding to the PDU set. At this time, if the RAN receives the SR / BSR in the new format, it will know that the PDU set to be uploaded by the UE is more important, and it will prioritize uplink resource scheduling for the UE. The format of the BSR can be determined by the MAC subheader carrying the LCID. In some implementations, the first format in this article can be represented by the reserved field of the LCID in the MAC subheader.

[0159] o If the fourth threshold is determined by the UE itself, the UE needs to inform the RAN after determining it. The UE can use UE assistance information (UAI)

[0160] The RAN may be informed by the method of the present invention, or may be informed by other existing messages. There is no limitation on what kind of message is used to inform the RAN.

[0161] o If the fourth threshold is determined by the RAN, the RAN needs to inform the UE after the determination so that the UE can use it. The RAN can inform the UE of the fourth threshold through an RRC message;

[0162] o If the fourth threshold is determined by the CN, the CN needs to inform the RAN and the UE after the determination. The CN can inform the RAN through the core network auxiliary information, and the RAN can inform the UE through the RRC message; or the CN can directly inform the UE through the non-access layer (NAS) message.

[0163] There is no restriction on what message the CN uses to inform the RAN and UE;

[0164] o If the PSI value corresponding to the PDU set to be transmitted is less than (or less than or equal to) the fourth threshold, the existing format SR / BSR (for example, general format,

[0165] The second format may be referred to herein as the second format) for transmission.

[0166] As described above, the first format may be different from the second format, so that the RAN may know the importance of the corresponding PDU set through the different formats.

[0167] In some implementations, the RAN side can determine the importance of uplink data by the priority of the logical channel (LCH), thereby determining the priority of uplink data packet scheduling. However, for XR services, PDU sets with different PSI values ​​may be mapped to LCHs with the same priority, such as PDU sets with PSI values ​​of 0, 1, and 2 are all mapped to LCHs with a priority of 1. If RAN resources are insufficient, all PDU sets on the LCH with a priority of 1 may be delayed in scheduling. The fundamental reason is that the RAN does not perceive the PSI corresponding to the PDU set on the LCH. Therefore, the present disclosure proposes a method to solve this problem. An example implementation may be:

[0168] When the PSI is greater than (or greater than or equal to) the fifth threshold, the UE may use a high-priority LCH or a dedicated (specific) LCH (for example, referred to as the first logical channel in this article) to send the corresponding SR / BSR, and the RAN may then prioritize the allocation of uplink resources to it. In some implementations, a new or dedicated LCID (logical channel ID) may also be defined for a PDU set whose PSI is greater than (or greater than or equal to) the fifth threshold.

[0169] (In one embodiment, the new or dedicated LCID can be represented by a reserved field in the LCID value). When the corresponding SR / BSR is sent through the LCH corresponding to the new or dedicated LCID, the RAN side can also sense it and allocate uplink resources to it preferentially.

[0170] o If the fifth threshold is determined by the UE itself, the UE needs to inform the RAN after determining it.

[0171] The UE may inform the RAN through UAI (UE assistance information) or other existing messages. There is no limitation on the message used to inform the RAN.

[0172] o If the fifth threshold is determined by the RAN, the RAN needs to inform the UE after determining it so that the UE can use it. The RAN can inform the UE of the fifth threshold through an RRC message;

[0173] o If the fifth threshold is determined by CN, CN needs to inform RAN and UE after determination.

[0174] CN can inform RAN through core network auxiliary information, and RAN can inform UE through RRC message; or CN can directly inform UE through NAS message. There is no restriction on which message CN uses to inform RAN and UE;

[0175] o If the PSI value corresponding to the PDU set to be transmitted is less than (or less than or equal to) the fifth threshold, the UE may use a general LCH (for example, which may be referred to as a second logical channel in this document) to send the corresponding SR / BSR;

[0176] In some implementations, the first logical channel as described above may have a higher priority than the second logical channel.

[0177] Herein, the first format may correspond to the first logical channel, and the second format may correspond to the second logical channel. Herein, the fourth threshold may be the same threshold as the fifth threshold or a different threshold, and may refer to each other.

[0178] It should be understood that any methods, aspects, steps, and embodiments described herein may be combined with each other.

[0179] Next, Figure 8 A flowchart of a method 800 performed by a first node in a wireless communication system according to an embodiment of the present disclosure is shown.

[0180] like Figure 8 As shown, the method 800 performed by the first node in the wireless communication system according to the embodiment of the present disclosure may include, in step S801, generating a rule for applying the importance of the protocol data unit set PSI for data transmission and / or discarding when the second node needs to discard data; and in step S802, sending indication information to the second node. As described above, the first node may be any CN node, and the second node may be any RAN node, such as any base station, gNB, eNB, centralized unit of a base station, distributed unit of a base station, control plane part, user plane part, cell, access point, etc. In some embodiments, the indication information may indicate one or more rules for applying the importance of the protocol data unit set PSI for data transmission when network congestion occurs at the second node.

[0181] According to an embodiment of the present disclosure, the rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; transmitting a protocol data unit (PDU) set whose PSI is greater than or greater than or equal to the first threshold; a PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted first; transmitting the PDU set according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; for multiple PDU sets with the same PSI, the PDU set with a smaller data volume is transmitted first; when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, the PDU sets with the association are transmitted first; and when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the PDU sets with the association are transmitted first.

[0182] According to an embodiment of the present disclosure, the indication information is sent in one or more of the following ways: the indication information is carried in a GPRS tunneling protocol user plane GTP-U header and sent; and the indication information is sent via a NG application protocol NGAP message.

[0183] According to an embodiment of the present disclosure, the method further includes: sending fourth information to the second node, wherein the fourth information indicates information related to the effective time of the rule.

[0184] According to an embodiment of the present disclosure, the method also includes receiving one or more of the following from a second node: first information, wherein the first information suggests that the first node configure a first PSI for an associated protocol data unit PDU set; second information, wherein the second information suggests that the first node not place associated data on different PDU sets or suggests that the first node place associated data on the same PDU set; and third information, wherein the third information indicates that congestion is currently occurring at the second node.

[0185] According to an embodiment of the present disclosure, the method further includes: sending fifth information to the second node, wherein the fifth information includes a mapping relationship between the PSI and the protocol data unit PDU set.

[0186] Figure 9a A flowchart of a method 900 performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown.

[0187] like Figure 9aAs shown, the method 900 performed by the second node in the wireless communication system according to the embodiment of the present disclosure may include, in step S901, receiving a scheduling request SR and / or a buffer status report BSR from a user equipment UE; and in step S902, sending an uplink grant to the UE. In some embodiments, the SR and / or BSR may be received through a first format or a first logical channel or through a second format or a second logical channel based on a protocol data unit set importance PSI of a protocol data unit PDU set corresponding to the SR and / or BSR.

[0188] In some embodiments, when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is greater than or greater than or equal to a fourth threshold, the SR and / or BSR is received through a first format or a first logical channel; and when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is less than or less than or equal to the fourth threshold, the SR and / or BSR is received through a second format or a second logical channel.

[0189] Figure 9b A flowchart of a method 910 performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown.

[0190] like Figure 9b As shown, the method 910 performed by the second node in the wireless communication system according to the embodiment of the present disclosure may include, in step S911, receiving indication information from the first node, and in step S912, transmitting and / or discarding data based on the indication information or the rules included therein. As described above, the first node may be any CN node, and the second node may be any RAN node. In some embodiments, the indication information may indicate one or more rules for applying the protocol data unit set importance PSI for data transmission when network congestion occurs at the second node.

[0191] According to an embodiment of the present disclosure, the rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; transmitting a protocol data unit (PDU) set whose PSI is greater than or greater than or equal to the first threshold; a PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted first; transmitting the PDU set according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; for multiple PDU sets with the same PSI, the PDU set with a smaller data volume is transmitted first; when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, the PDU sets with the association are transmitted first; and when multiple PDU sets are mapped to different service quality QoS flows, if different QoS flows are associated, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the PDU sets with the association are transmitted first.

[0192] According to an embodiment of the present disclosure, the indication information is sent in one or more of the following ways: the indication information is carried in a GPRS tunneling protocol user plane GTP-U header and sent; and the indication information is sent via a NG application protocol NGAP message.

[0193] According to an embodiment of the present disclosure, the method further includes: receiving fourth information from the first node, wherein the fourth information indicates information related to the effective time of the rule.

[0194] According to an embodiment of the present disclosure, the method also includes sending one or more of the following to the first node: first information, wherein the first information suggests that the first node configure a first PSI for an associated protocol data unit PDU set; second information, wherein the second information suggests that the first node not place associated data on different PDU sets or suggests that the first node place associated data on the same PDU set; and third information, wherein the third information indicates that congestion is currently occurring at the second node.

[0195] According to an embodiment of the present disclosure, the method also includes: receiving fifth information from the first node, wherein the fifth information includes a mapping relationship between the PSI and the protocol data unit PDU set; and sending the mapping relationship between the PSI and the protocol data unit PDU set to a user equipment UE.

[0196] Fig.9c A flowchart of a method 920 performed by a second node in a wireless communication system according to an embodiment of the present disclosure is shown.

[0197] like Fig.9c As shown, the method 920 performed by the second node in the wireless communication system according to the embodiment of the present disclosure may include, in step S921, sending a handover request message to a third node; in step S922, receiving a handover request confirmation message from the third node; and in step S923, sending a handover command to the UE. In some embodiments, the handover request confirmation message may include the second DRX configuration configured by the third node for the user equipment UE. In some embodiments, the handover command may include the second DRX configuration. As described above, the first node may be any CN node, and the second node may be any RAN node. The third node may be any node that can be a handover target node.

[0198] According to an embodiment of the present disclosure, the handover request confirmation message further includes a triggering condition for applying the second DRX configuration, and wherein the handover command further includes the triggering condition.

[0199] According to an embodiment of the present disclosure, the trigger condition includes one or more of the following: triggering the second DRX configuration after the UE switches to the third node; triggering the second DRX configuration after the UE switches to the third node and a first time period has passed; and triggering the second DRX configuration after the UE switches to the third node and receives trigger information sent by the third node.

[0200] According to an embodiment of the present disclosure, the handover request message includes the first DRX configuration configured by the second node for the UE and / or the third DRX configuration desired by the UE.

[0201] Fig.10 A flowchart of a method 1000 executed by a user equipment UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0202] like Fig.10 As shown, the method 1000 performed by a user equipment UE in a wireless communication system according to an embodiment of the present disclosure may include, in step S1001, sending a scheduling request SR and / or a buffer status report BSR to a second node, and in step S1002, receiving an uplink grant from the second node. As described above, the second node may be any RAN node. In some embodiments, the SR and / or BSR may be sent through a first format or a first logical channel or through a second format or a second logical channel based on a protocol data unit set importance PSI of a protocol data unit PDU set corresponding to the SR and / or BSR.

[0203] According to an embodiment of the present disclosure, when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is greater than or greater than or equal to a fourth threshold, the SR and / or BSR is sent by the UE through a first format or a first logical channel; and when the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is less than or less than or equal to the fourth threshold, the SR and / or BSR is sent by the UE through a second format or a second logical channel.

[0204] According to an embodiment of the present disclosure, the method further includes: sending the fourth threshold to the second node.

[0205] According to an embodiment of the present disclosure, the method also includes: receiving a switching command from the second node, wherein the switching command includes a second DRX configuration configured for the UE by a third node as a switching target node, wherein the second DRX configuration is received by the second node from the third node.

[0206] According to an embodiment of the present disclosure, the switching command also includes a triggering condition for applying the second DRX configuration.

[0207] According to an embodiment of the present disclosure, the trigger condition includes one or more of the following: triggering the second DRX configuration after the UE switches to the third node; triggering the second DRX configuration after the UE switches to the third node and a first time period has passed; and triggering the second DRX configuration after the UE switches to the third node and receives trigger information sent by the third node.

[0208] It should be understood that methods 800, 900, 910, 920 and 1000 according to the embodiments of the present disclosure may also include one or more of the methods or steps described above in conjunction with any examples or drawings, which will not be repeated here.

[0209] Next, Fig.11 A schematic diagram of a node 1100 in a wireless communication system according to an embodiment of the present disclosure is shown.

[0210] like Fig.11 As shown, the node 1100 according to an embodiment of the present disclosure (for example, it may be the first node (for example, CN node), the second node (for example, RAN node) or any other network node as described above) may include a transceiver 1110 and a processor 1120. The transceiver 1110 may be configured to send and receive signals. The processor 1120 may be coupled to the transceiver 1110 and may be configured to (for example, control the transceiver 1110) perform any method performed by a node in a wireless communication system according to an embodiment of the present disclosure.

[0211] Fig.12 A schematic diagram of a user equipment 1200 in a wireless communication system according to an embodiment of the present disclosure is shown.

[0212] like Fig.12 As shown, the user equipment 1200 according to an embodiment of the present disclosure may include a transceiver 1210 and a processor 1220. The transceiver 1210 may be configured to send and receive signals. The processor 1220 may be coupled to the transceiver 1210 and may be configured to (e.g., control the transceiver 1210) perform any method performed by the user equipment according to an embodiment of the present disclosure. In this document, the processor may also be referred to as a controller.

[0213] Various embodiments of the present disclosure may be implemented as computer-readable codes embodied on a computer-readable recording medium from a specific perspective. A computer-readable recording medium is any data storage device that can store data readable by a computer system. Examples of computer-readable recording media may include read-only memory (ROM), random access memory (RAM), compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, optical data storage device, carrier wave (e.g., data transmission via the Internet), and the like. Computer-readable recording media may be distributed via a computer system connected via a network, and therefore computer-readable codes may be stored and executed in a distributed manner. Moreover, the functional programs, codes, and code segments for implementing the various embodiments of the present disclosure may be easily interpreted by a technician in the field of the embodiments of the present disclosure.

[0214] It will be understood that the embodiments of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software. Software may be stored as program instructions or computer-readable codes executable on a processor on a non-transient computer-readable medium. Examples of non-transient computer-readable recording media include magnetic storage media (e.g., ROM, floppy disk, hard disk, etc.) and optical recording media (e.g., CD-ROM, digital video disk (DVD), etc.). Non-transient computer-readable recording media may also be distributed on network-coupled computer systems so that computer-readable codes are stored and executed in a distributed manner. The medium may be read by a computer, stored in a memory, and executed by a processor. Various embodiments may be implemented by a computer or a portable terminal including a controller and a memory, and the memory may be an example of a non-transient computer-readable recording medium suitable for storing (multiple) programs with instructions for implementing embodiments of the present disclosure. The present disclosure may be implemented by a program having a code for specifically implementing the apparatus and method described in the claims, the program being stored in a machine (or computer) readable storage medium. The program may be electronically carried on any medium, such as a communication signal transmitted via a wired or wireless connection, and the present disclosure suitably includes its equivalents.

[0215] The above description is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can make various changes or substitutions within the technical scope disclosed in the present disclosure, and these changes or substitutions should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method performed by a first node in a wireless communication system, comprising: Generate a rule for transmitting and / or discarding data by applying the protocol data unit set importance PSI when the second node needs to discard data; as well as Send indication information to the second node, wherein the indication information indicates the rule.

2. The method according to claim 1, wherein: The rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; Transmitting a set of protocol data units (PDUs) having a PSI greater than or greater than or equal to a first threshold; A PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted preferentially; The PDU set is transmitted according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; For multiple PDU sets with the same PSI, the PDU set with smaller data volume is transmitted first; When multiple PDU sets are mapped to different QoS flows, if the different QoS flows are associated, the PDU sets with the association are transmitted preferentially; and When multiple PDU sets are mapped to different service quality QoS flows, if there is an association between different QoS flows, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the associated PDU sets are transmitted preferentially.

3. The method according to claim 1, wherein: The indication information is sent in one or more of the following ways: The indication information is carried in a GPRS Tunneling Protocol User Plane GTP-U header and sent; and The indication information is sent via a NG application protocol NGAP message.

4. The method according to claim 1, further comprising: Send fourth information to the second node, wherein the fourth information indicates information related to the effective time of the rule.

5. The method of claim 1 , further comprising receiving from the second node one or more of: first information, wherein the first information recommends that the first node configure a first PSI for an associated protocol data unit (PDU) set; second information, wherein the second information suggests that the first node not place the associated data in different PDU sets or suggests that the first node place the associated data in the same PDU set; and The third information indicates that congestion currently occurs at the second node.

6. The method according to claim 1, further comprising: Send fifth information to the second node, wherein the fifth information includes a mapping relationship between the PSI and a protocol data unit PDU set.

7. A method performed by a second node in a wireless communication system, comprising: receiving a scheduling request SR and / or a buffer status report BSR from a user equipment UE, wherein the SR and / or BSR are received through a first format or a first logical channel or through a second format or a second logical channel based on a protocol data unit set importance PSI of a protocol data unit PDU set corresponding to the SR and / or BSR; and An uplink grant is sent to the UE.

8. The method according to claim 7, wherein: When the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is greater than or greater than or equal to a fourth threshold, the SR and / or BSR is received through the first format or the first logical channel; and When the PSI of the protocol data unit PDU set corresponding to the SR and / or BSR is less than or less than or equal to the fourth threshold, the SR and / or BSR is received through the second format or the second logical channel.

9. A method performed by a second node in a wireless communication system, comprising: receiving indication information from the first node, wherein the indication information indicates a rule for applying a protocol data unit set importance (PSI) to perform data transmission and / or discard when the second node needs to discard data; and Data is transmitted and / or discarded based on the rules.

10. The method according to claim 9, wherein: The rules include one or more of the following: discarding a protocol data unit (PDU) set whose PSI is less than or less than or equal to a first threshold; Transmitting a set of protocol data units (PDUs) having a PSI greater than or greater than or equal to a first threshold; A PDU set whose PSI is greater than or greater than or equal to a second threshold has a higher priority, and the PDU set with a higher priority is transmitted preferentially; The PDU set is transmitted according to the transmission priority, wherein the transmission priority of each PDU set is proportional to the PSI of the PDU set; For multiple PDU sets with the same PSI, the PDU set with smaller data volume is transmitted first; When multiple PDU sets are mapped to different QoS flows, if the different QoS flows are associated, the PDU sets with the association are transmitted preferentially; and When multiple PDU sets are mapped to different service quality QoS flows, if there is an association between different QoS flows, when the PSI of the PDU sets on the associated different QoS flows is greater than or greater than or equal to a third threshold, the associated PDU sets are transmitted preferentially.

11. The method according to claim 9, wherein: The indication information is sent in one or more of the following ways: The indication information is carried in a GPRS Tunneling Protocol User Plane GTP-U header and sent; and The indication information is sent via a NG application protocol NGAP message.

12. The method according to claim 9, further comprising: Fourth information is received from the first node, wherein the fourth information indicates information related to the effective time of the rule.

13. The method of claim 9, further comprising sending to the first node one or more of: first information, wherein the first information recommends that the first node configure a first PSI for an associated protocol data unit (PDU) set; second information, wherein the second information suggests that the first node not place the associated data in different PDU sets or suggests that the first node place the associated data in the same PDU set; and The third information indicates that congestion currently occurs at the second node.

14. The method according to claim 9, further comprising: receiving fifth information from the first node, wherein the fifth information includes a mapping relationship between a PSI and a protocol data unit (PDU) set; and The mapping relationship between the PSI and the protocol data unit PDU set is sent to the user equipment UE.

15. A method performed by a second node in a wireless communication system, comprising: Sending a switching request message to the third node; receiving a handover request confirmation message from the third node, wherein the handover request confirmation message includes a second DRX configuration configured by the third node for the user equipment UE; and Send a handover command to the UE, wherein the handover command includes the second DRX configuration.

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