Method and apparatus for data transmission in a wireless communication system

Abstract

The disclosure relates to a 5G or 6G communication method for supporting a higher data transmission rate, the method comprising transmitting a request message including first information indicating a protocol data unit set importance (PSI) based service data unit (SDU) discard for an uplink (UL) or second information indicating an explicit congestion notification (ECN) marking or a congestion information reporting and receiving a request acknowledging message as a response to the request message.

Description

METHOD AND APPARATUS FOR DATA TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM

[0001] The present disclosure relates to the technical field of wireless communication, and more specifically, it relates to a node, user equipment in a wireless communication system and a method performed thereof.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in “Sub 6GHz” bands such as 3.5GHz, but also in “Above 6GHz” bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz (THz) bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] This disclosure relates to wireless communication networks, and more particularly to a terminal and a communication method thereof in a wireless communication system.

[0009] In one embodiment, a method performed by a second node in a wireless communication system, comprising: receiving first indication information from a first node; handling a conflict between a measurement gap and data transmission according to the first indication information.

[0010] Aspects of the disclosure are to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide efficient communication methods in a wireless communication system.

[0011] The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0012] Fig. 1 is an exemplary system architecture of System Architecture Evolution (SAE);

[0013] Fig. 2 is an exemplary system architecture according to various embodiments of the present disclosure;

[0014] Fig. 3A illustrates an example structure of a base station according to an embodiment of the present disclosure;

[0015] Fig. 3B illustrates an example structure of a base station according to an embodiment of the present disclosure;

[0016] Fig. 3C illustrates an example structure of a base station according to an embodiment of the present disclosure;

[0017] Fig. 4 illustrates an example of related parameters of video, audio and pose data;

[0018] Fig. 5A illustrates an example of configuring a specific measurement gap value to coordinate the conflict between the data transmission and the measurement gap according to an embodiment of the present disclosure;

[0019] Fig. 5B illustrates another example of configuring a specific measurement gap value to coordinate the conflict between the data transmission and the measurement gap according to an embodiment of the present disclosure;

[0020] Fig. 5C illustrates another example of configuring a specific measurement gap value to coordinate the conflict between the data transmission and the measurement gap according to an embodiment of the present disclosure;

[0021] Fig. 6 illustrates an example of conflict between measurement gaps when multiple measurement gaps are configured according to an embodiment of the present disclosure;

[0022] Fig. 7 illustrates an example of the processing of conflict between the data transmission and the measurement gap when configuring Discontinuous Reception (DRX) according to an embodiment of the present disclosure;

[0023] Fig. 8 illustrates a flowchart of a method performed by a second node in a wireless communication system according to an embodiment of the present disclosure;

[0024] Fig. 9 illustrates an example in which the measurement gap adopts an adaptive method to avoid the collision according to the embodiment of the present disclosure;

[0025] Fig. 10 illustrates an example in which the DRX mechanism adopts an adaptive method to avoid the collision according to the embodiment of the present disclosure;

[0026] Fig. 11 illustrates an example structure of a network structure in a dual connection according to an embodiment of the present disclosure;

[0027] Fig. 12 illustrates a schematic diagram of a node in a wireless communication system according to an embodiment of the present disclosure; and

[0028] Fig. 13 illustrates a schematic diagram of user equipment in a wireless communication system according to an embodiment of the present disclosure.

[0029] Aspects of the disclosure are to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a terminal and a communication method thereof in a wireless communication system.

[0030] An embodiment of the present disclosure provides a method performed by a second node in a wireless communication system, comprising: receiving first indication information from a first node; handling a conflict between a measurement gap and data transmission according to the first indication information.

[0031] According to an embodiment of the present disclosure, wherein the first indication information may indicate one or more of: performing data transmission without performing a measurement; performing a measurement in a next measurement gap that does not conflict with data transmission, when the conflict occurs continuously; performing a measurement in a next measurement gap after a number of consecutive conflicts exceeds a first threshold; performing no measurement when a pre-configured condition is met.

[0032] According to an embodiment of the present disclosure, wherein the first threshold is determined by one or more of ways: the second node determines the first threshold and indicates it to the first node through first information; the first node determines the first threshold and indicates it to the second node through second indication information; the second node indicates an expected first threshold to the first node through the first information; the first node determines the first threshold according to the first information and indicates it to the second node through the second indication information.

[0033] According to the embodiment of the present disclosure, wherein the pre-configured condition includes one or more of: a value of RSRP and / or RSRQ of a serving cell being higher than a second threshold; the second node being in a low mobility state; duration that the second node is in a static state being higher than a third threshold; the second node being in a measurement relaxation state; when the second node is in the measurement relaxation state, the number of consecutive collisions between the measurement gap and data transmission being less than, or less than or equal to the fourth threshold.

[0034] According to an embodiment of the present disclosure, wherein the method further comprises receiving third indication information from the first node, wherein the third indication information may indicate one or more of: indicating the second node to perform data transmission or a radio resource (e.g. frequency) measurement when a next collision occurs; indicating the second node to modify, and / or activate, and / or deactivate content indicated by the first indication information.

[0035] An embodiment of the present disclosure provides a method performed by a first node in a wireless communication system, comprising: receiving assistance information related to a service of a second node from a core network; transmitting first indication information to the second node according to the assistance information.

[0036] According to an embodiment of the present disclosure, wherein the first indication information may indicate one or more of: performing data transmission without performing a measurement; performing a measurement in a next measurement gap that does not conflict with data transmission, when the conflict occurs continuously; performing a measurement in a next measurement gap after a number of consecutive conflicts exceeds a first threshold; performing no measurement when a pre-configured condition is met.

[0037] According to the embodiment of the present disclosure, wherein the first threshold is determined by one or more of ways: the second node determines the first threshold and indicates it to the first node through first information; the first node determines the first threshold and indicates it to the second node through second indication information; the second node indicates an expected first threshold to the first node through the first information; the first node determines the first threshold according to the first information and indicates it to the second node through the second indication information.

[0038] According to the embodiment of the present disclosure, wherein the pre-configured condition includes one or more of: a value of RSRP and / or RSRQ of a serving cell being higher than a second threshold; the second node being in a low mobility state; duration that the second node is in a static state being higher than a third threshold; the second node being in a measurement relaxation state; when the second node is in the measurement relaxation state, the number of consecutive collisions between the measurement gap and data transmission being less than, or less than or equal to the fourth threshold.

[0039] According to the embodiment of the present disclosure, wherein the method further comprises transmitting third indication information to the second node, wherein the third indication information may indicate one or more of: indicating the second node to perform data transmission or a radio resource (e.g. frequency) measurement when a next collision occurs; indicating the second node to modify, and / or activate, and / or deactivate content indicated by the first indication information.

[0040] An embodiment of the present disclosure provides a method performed by a first node in a wireless communication system, comprising: transmitting a request message for establishing or modifying a dual connection to a third node; receiving a response for the request for establishing or modifying the dual connection from the third node, wherein the response message carries indication information, and the indication information indicates that the third node has configured protocol data unit set importance based discarding.

[0041] According to an embodiment of the present disclosure, wherein the request message can carry indication information indicating that the first node has configured protocol data unit set importance based discarding.

[0042] According to an embodiment of the present disclosure, wherein the request message can carry uplink traffic configuration information, which can be carried in UE assistance information, and the uplink traffic configuration information includes at least one of: a jitter range; burst arrival time; a traffic periodicity; protocol data unit set indication information or identification information.

[0043] According to the embodiment of the present disclosure, wherein the third node configures discontinuous reception with reference to uplink traffic configuration information.

[0044] According to the embodiment of the present disclosure, wherein the method further comprises the following steps: the first node transmitting a message to a fourth node, and the message carrying indication information of protocol data unit set importance based discarding, and the indication information being used by the fourth node to activate or deactivate protocol data unit set importance based discard for the second node.

[0045] According to the embodiment of the present disclosure, the method further comprises the following steps: the third node transmitting a message to a fifth node, and the message carrying indication information of protocol data unit set importance based discarding, and the indication information being used by the fifth node to activate or deactivate protocol data unit set importance based discard for the second node.

[0046] An embodiment of the present disclosure provides a node in a wireless communication system, including a transceiver configured to transmit and receive signals; and a controller coupled with the transceiver and configured to perform any method performed by a first node or a second node or a third node or a fourth node or a fifth node in a wireless communication system according to an embodiment of the present disclosure.

[0047] An embodiment of the present disclosure provides a user equipment (UE) in a wireless communication system, including a transceiver configured to transmit and receive signals; and a controller coupled with the transceiver and configured to perform any method performed by a user equipment (UE) in a wireless communication system according to an embodiment of the present disclosure.

[0048] An embodiment of the present disclosure provides a computer-readable medium on which computer-readable instructions are stored, which, when performed by a processor, are used to implement any method performed by a first node or a second node or a third node or a fourth node or a fifth node or a user equipment (UE0 in a wireless communication system according to embodiments of the present disclosure.

[0049] The method performed by the first node and / or the second node and / or the third node and / or the fourth node and / or the fifth node and / or the user equipment in the wireless communication system provided by the embodiment of the present disclosure can ensure the measurement and throughput of the terminal at the same time, effectively alleviate or solve the network congestion, and improve the service experience of users.

[0050] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. The description includes various specific details to assist in that understanding but should be regarded as exemplary only. Accordingly, the common skilled in the art will recognize that various changes and modifications to the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0051] The terms and wordings used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, 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 purpose only, but not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0052] It should be understood that the singular forms "a," "an," and "the" include plural referents, unless clearly indicated otherwise in the context. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0053] The term "include" or "may include" refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the present disclosure, and does not limit the existence of one or more additional functions, operations, or components. The terms "include" and / or "have" may be construed to represent certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but may not be construed to exclude the possibility of existence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0054] The term "or" used in various embodiments of the present disclosure includes any of the listed terms or all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0055] Unless defined differently, all terms used in the present disclosure, including technical or scientific terms, have the same meanings as those understood by the skilled in the art as described in the present disclosure. Common terms as defined in a dictionary are to be interpreted to have meanings consistent with the context in the related technical field o, and are not to be interpreted ideally or excessively, unless clearly defined as such in the present disclosure.

[0056] Figs. 1 to 13 discussed below and various embodiments for describing the principle of the present disclosure in this patent document are only for illustration, and should not be interpreted as limiting the scope of the present disclosure in any way. Those skilled in the art will understand that the principle of the present disclosure may be implemented in any suitably arranged system or device.

[0057] In order to meet an increasing demand for wireless data communication services since a deployment of 4G communication system, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called "beyond 4G network" or "post LTE system".

[0058] Wireless communication is one of the most successful innovations in modern history. Recently, a number of subscribers of wireless communication services has exceeded 5 billion, and it continues growing rapidly. With the increasing popularity of smart phones and other mobile data devices (such as tablet computers, notebook computers, netbooks, e-book readers and machine-type devices) in consumers and enterprises, a demand for wireless data services is growing rapidly. In order to meet rapid growth of mobile data services and support new applications and deployments, it is very important to improve efficiency and coverage of wireless interfaces.

[0059] Compared with 4G, 5G communication technology has a faster transmission speed, so it can provide users with more kinds of communication services. Extended Reality (XR) service is regarded as the key application service to promote the development of 5G technology, and it is the general name of three service types: augmented reality (AR), virtual reality (VR) and mixed reality (MR). XR service requires high transmission speed and delay, so it needs more network resources to support the normal operation of the service. 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 become a big 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, improving network capacity, and improving XR perception.

[0060] Fig. 1 is an exemplary system architecture 100 of system architecture evolution (SAE). User equipment (UE) 101 is a terminal device for receiving data. An evolved universal terrestrial radio access network (E-UTRAN) 102 is a radio access network, which includes a macro base station (eNodeB / NodeB) that provides UE with interfaces to access the radio network. A mobility management entity (MME) 103 is responsible for managing mobility context, session context and security information of the UE. A serving gateway (SGW) 104 mainly provides functions of user plane, and the MME 103 and the SGW 104 may be in the same physical entity. A packet data network gateway (PGW) 105 is responsible for functions of charging, lawful interception, etc., and may be in the same physical entity as the SGW 104. A policy and charging rules function entity (PCRF) 106 provides quality of service (QoS) policies and charging criteria. A general packet radio service support node (SGSN) 108 is a network node device that provides routing for data transmission in a universal mobile telecommunications system (UMTS). A home subscriber server (HSS)109 is a home subsystem of the UE, and is responsible for protecting user information including a current location of the user equipment, an address of a serving node, user security information, and packet data context of the user equipment, etc.

[0061] Fig. 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.

[0062] User equipment (UE) 201 is a terminal device for receiving data. A next generation radio access network (NG-RAN) 202 is a radio access network, which includes a base station (a gNB or an eNB connected to 5G core network 5GC, and the eNB connected to the 5GC is also called ng-gNB) that provides UE with interfaces to access the radio network. An access control and mobility management function entity (AMF) 203 is responsible for managing mobility context and security information of the UE. A user plane function entity (UPF) 204 mainly provides functions of user plane. A session management function entity SMF 205 is responsible for session management. A data network (DN) 206 includes, for example, services of operators, access of Internet and service of third parties.

[0063] In NR system, in order to support network function virtualization, more efficient resource management and scheduling, a base station (gNB / ng-eNB) that provides a radio network interface for user equipment (UE) can be further divided into a centralized unit gNB-CU / ng-eNB-CU (gNB central unit / ng-eNB central unit) and a distributed unit gNB-DU / ng-eNB-DU (gNB distributed unit / ng-eNB distributed unit) (abbreviated as CU and DU in the present invention), as shown in Fig. 3(a). gNB-CU has Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP) and Packet Data Convergence Protocol (PDCP) protocols, etc, while ng-eNB-CU has RRC and PDCP layers. gNB-DU / ng-eNB-DU has Radio Link Control (RLC), Media Access Control (MAC) and physical layer, 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 transport network layer of F1-C is based on IP transport. In order to transmit signaling more reliably, SCTP (Stream Control Transmission Protocol) protocol is added to IP. The protocol of the application layer is F1AP (F1 Application Protocol). SCTP can provide reliable application layer message transmission. The transport layer of F1-U is UDP / IP, and GTP-U (GPRS Tunnelling Protocol-User plane) is used to carry user plane protocol data unit PDU above UDP / IP. Further, for gNB-CU, as shown in Fig. 3(b), gNB-CU can include gNB-CU-CP (the control plane part of the centralized unit of the base station) and gNB-CU-UP (the user plane part of the centralized unit of the base station). gNB-CU-CP includes the function of the control plane of the base station and has RRC and SDAP protocol layers, and gNB-CU-UP includes the function of the user plane of the base station and has SDAP and PDCP protocol layers. gNB-CU-CP and gNB-CU-UP are standardized public interfaces E1, and the protocol is 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 F1-C interface, that is, the control plane interface of F1, and the interface between the user plane part of the centralized unit of the base station and the distributed unit of the base station is F1-U interface, that is, the user plane interface of F1. In addition, in the NR system, the base station providing the E-UTRA user plane and control plane which accesses the 5G core network is called ng-eNB. In order to support virtualization, such a 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) (abbreviated as CU and DU in the present invention), as shown in Fig. 3(c). ng-eNB-CU has RRC and PDCP layers. gNB-DU / ng-eNB-DU has radio link control protocol (RLC), medium access control (MAC) and physical layer, etc. There is a standardized public interface W1 between ng-eNB-CU and ng-eNB-DU. 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 transport. In order to transmit signaling more reliably, SCTP protocol is added to 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 above UDP / IP.

[0064] In order to conduct better research on the field of XR, a concept of packet data unit set (PDU set) is proposed. A PDU set is composed of one or more PDUs, and one PDU set may be one frame or one video slice in the XR service. One PDU set can only be mapped to one QoS (Quality of Service) flow, and related parameters, such as PDU Set Delay Budget (PSDB), PDU Set Error Rate (PSER) and PDU Set Integrated Handling Indication (PSIHI), of all the PDU sets on one QoS flow 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 this disclosure is to solve the above technical problem, and propose a method of data transmission (or packet discarding) by using PSI on the RAN side.

[0065] Different PDU sets can have different degrees of importance, which can be expressed by protocol data unit set importance (PSI) (for example, its value can be high / medium / low, or 0-7, but not limited to this), and different PDU sets on the same QoS flow can also have different PSI. PSI can be informed to the radio access network (RAN) by UPF through GTP-U header. When the network congestion occurs on the RAN side, the corresponding PDU sets can be discarded according to the value of PSI (such as discarding some PDU sets with smaller PSI values), so as to alleviate or solve the network congestion.

[0066] XR service has the characteristics of periodic data transmission, small transmission delay and a large amount of transmission data. While providing data transmission for the UE, the base station will also configure related measurement configuration information for the UE to measure the signal quality of the intra-frequency and / or inter-frequency. If the current signal quality of the UE is not good, the base station can handover the UE to a cell with good signal quality in time according to the measurement report reported by the UE. When UE performs inter-radio resource (e.g. frequency) measurement, data transmission cannot be performed in the measurement gap (MG) because the measurement frequency is different from the frequency used for data transmission. If the data transmission conflicts with the measurement gap, it is also necessary to stop the data transmission and perform the radio resource (e.g. frequency) measurement. For XR users, data transmission is periodic, and when the base station configures the measurement gap for the UE, it usually allows the UE to make periodic measurements. If the data transmission of UE frequently collides with the measurement gap, the throughput of UE will be seriously reduced, which will seriously affect the user experience.

[0067] Exemplary embodiments of the present disclosure are further described below with reference to the accompanying drawings.

[0068] 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, based on the disclosure herein, it will be apparent to those skilled in the art that changes may be made to the illustrated embodiments and examples without departing from the scope of the present disclosure.

[0069] Before introducing the specific content, some assumptions and some definitions of this disclosure are given below.

[0070] The message names in this disclosure are just examples, and other message names can be used.

[0071] The "first" and "second" included in the message names in this disclosure are only examples of messages and are only used to distinguish messages, and they do not represent the execution order.

[0072] A detailed description of steps irrelated to this disclosure is omitted in this disclosure.

[0073] In the present disclosure, the steps in various aspects, methods and processes can be combined with each other or performed independently. The execution steps of each process are only examples, and other possible execution orders are not excluded.

[0074] In this 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.

[0075] In this disclosure, the transmission of data refers to the reception and / or transmission of data.

[0076] In this disclosure, the first node refers to a base station or a master node, the second node refers to a UE or a terminal device, and the third node refers to a base station or a secondary node.

[0077] The first aspect: configure specific measurement gap values to avoid the conflict.

[0078] When the base station configures a measurement gap for the UE, the measurement gap length (MGL) can be configured from the set (1.5ms, 3 ms, 3.5 ms, 4 ms, 5.5 ms, 6 ms), and the measurement gap repetition period (MGRP) can be configured from the set (20ms, 40ms, 80ms, 160ms). XR data transmission can generally include related data such as video, audio and pose, and the traffic periodicity of these data types are different, as shown in Fig. 4. Therefore, in order to avoid the conflict between the measurement gap and data transmission, the value of MGRP can be configured as a multiple of the data traffic periodicity, and the specific method is as follows:

[0079] One embodiment is to configure a specific MGRP value to match the traffic periodicity of XR data:

[0080] ● If the traffic periodicity of current data can be exactly divisible by MGRP, such as audio traffic with a period of 10ms or pose traffic with a period of 4ms, as shown in Figs. 5A and 5B, the base station can configure any measurement gap repetition period in the existing set, as long as the MGL time is staggered from the time when the UE transmits data, and this scheme can be realized by network implementation.

[0081] ● If the traffic periodicity of current data cannot be divisible by MGRP, for example, video traffic with a period of 16.67ms is transmitted, as shown in Fig. 5C, then:

[0082] ■ Introduce a new non-integer MGRP, such as 50 / 3ms or multiples of 50 / 3ms;

[0083] ■ Introduce a new integer MGRP, such as 50ms, 100ms, etc.

[0084] ● If there are many kinds of data with different periods to be transmitted, for example, when audio traffic with a period of 10ms, pose traffic with a period of 4ms and video traffic with a period of 16.67ms need to be transmitted at the same time, it is necessary to introduce the common multiple of these data traffic periodicity as the value of MGRP, such as 100ms or multiples of 100ms;

[0085] According to the method described in the above embodiment, it can be known that if data with different periods are transmitted, the conflict between measurement gap and data transmission can be avoided because the common multiple of these traffic periodicity needs to be configured as the value of MGRP. However, at this time, the value of MGRP will become larger. The larger MGRP will cause the base station to fail to receive the measurement report sent by the UE in time, and it will also fail to perform handover for the UE with the poor signal quality in time, thus affecting the normal data transmission of the UE. Therefore, if different types of data are transmitted through different QoS flows, the base station can configure MGRP matching its data traffic periodicity for each type of data or for each QoS flow. For example, audio traffic with a period of 10ms is transmitted through QoS flow1, and video traffic with a period of 16.67ms is transmitted through QoS flow2. At this time, MGRP with a value of 20ms can be configured for QoS flow1 and MGRP with a value of 50ms can be configured for QoS flow2. But at this time, another problem will be introduced, that is, conflicts will also occur between multiple MGRPs, as shown in Fig. 6. If the configuration information of MG1 is: the MGL value is 6ms, and the MGRP value is 50 / 3 ms; and the configuration information of MG2 is: MGL is 6ms and MGRP is 20ms, after a period of time, the measurement gap of MG1 will overlap with the measurement gap of MG2, that is, a conflict between measurement gaps is generated, so the present invention also proposes the following scheme to solve the problem of the conflicts between measurement gap when multiple measurement gaps are configured.

[0086] One embodiment is that when the base station configures multiple measurement gaps for the UE, it transmits fourth indication information to the UE, indicating that one or more of methods below are adopted when a conflict occurs between the multiple measurement gaps configured by the UE:

[0087] ● Perform the measurement by using the first or last measurement gap among the multiple measurement gaps where conflicts occur;

[0088] ● Perform the measurement by using the specified measurement gap ID, and the fourth indication information needs to contain the ID of the measurement gap, namely MeasGapId;

[0089] ● Do not perform the measurement

[0090] ● Perform the measurement in multiple measurement gaps where conflicts occur;

[0091] The fourth indication information may be sent to the UE through an RRC message (such as RRC setup or RRC reconfiguration) or a DCI message, which is not limited by the present invention.

[0092] The second aspect: coordinate the conflict between DRX application and measurement gap.

[0093] Because XR service is periodic, it is suitable to use DRX mechanism to save power for UE. When the UE applies the DRX mechanism and does not introduce a new MGRP value, the measurement gap may conflict with the onduration in the DRX cycle, as shown in Fig. 7. This will cause the UE to be unable to receive the Physical Downlink Control Channel (PDCCH) sent by the base station during the onduration, and thus unable to receive the downlink data in the current DRX cycle. This will cause the UE to wait until the next DRX cycle to receive downlink data, resulting in a large data transmission delay. Therefore, the present invention proposes the following methods to solve the problem of the conflict with measurement gap when DRX mechanism is applied.

[0094] As shown in Fig. 8, a method 800 performed by a second node in a wireless communication system according to an embodiment of the present disclosure may include, in step S801, receiving first indication information from the first node, wherein the first indication information is used to indicate a rule that the second node to handle the conflict between measurement gap and data transmission; and in step S802, handling the conflict between the measurement gap and the data transmission according to the first indication information.

[0095] One embodiment is that the base station transmits the first indication information to the UE according to the assistance information related to the UE traffic sent by the core network (the assistance information can be the data traffic periodicity and transmission delay requirements of the UE, etc.), and indicates the UE to adopt one or more of methods to avoid the conflict:

[0096] ● When the measurement gap conflicts with the onduration in DRX cycle, UE transmits data without performing measurement;

[0097] ● When the measurement gap continuously conflicts with the onduration in DRX cycle, UE performs the measurement at the next measurement gap where the conflict with the onduration does not occur;

[0098] ● After the number of consecutive conflicts between the measurement gap and onduration exceeds a first threshold, the UE performs the measurement at the next measurement gap;

[0099] ■ The first threshold can be informed to the base station by the UE through first information, which can be UE assistance information;

[0100] ■ The first threshold can also be informed to the UE by the base station through the second indication information, which can be RRC message or DCI, which is not limited by the present invention;

[0101] ■ The above two methods can also be combined, that is, the UE first informs the base station the first threshold it expects through the first information, and the base station refers to the first information to determine the final first threshold, and then informs it to the UE through the second indication information;

[0102] ● When the UE meets one or more of conditions, no measurement is performed:

[0103] ■ When the RSRP / RSRQ value of the serving cell is higher than a second threshold;

[0104] ■ When the UE is in the low mobility state;

[0105] ■ When the UE is in a static state and meets a third threshold;

[0106] ■ When the UE is in the measurement relaxation state;

[0107] ■ When the UE is in the measurement relaxation state, the number of consecutive collisions between the measurement gap and onduration is less than, or less than or equal to the fourth threshold;

[0108] ● Because the base station knows the DRX configuration parameters and the time / duration of the measurement gap, after transmitting the first indication information to the UE, the base station can also transmit the third indication information to the UE before the conflicts occur between measurement gap and onduration:

[0109] ■ Indicate the UE to transmit data or perform measurement when the next collision occurs;

[0110] ■ Indicate the UE to modify, and / or activate, and / or deactivate the related content of the first indication information;

[0111] ● Both the first indication information and the third indication information can be sent through DCI, RRC message, or MAC CE, which is not limited by the present invention;

[0112] In addition to the data transmission or radio resource (e.g. frequency) measurement performed by UE according to the first and / or third indication information sent by the base station mentioned in the above embodiments, an adaptive method can also be adopted to avoid the occurrence of conflicts. The adaptive method can be further divided into adaptively changing the configuration of the measurement gap and adaptively changing the related configuration of DRX.

[0113] For adaptively changing the configuration of measurement gap, as shown in Fig. 9, if the measurement gap is partially overlapped with the onduration, one or more of methods can be adopted:

[0114] ● Scheme 1: In the overlapping part, that is, within the time when the collision occurs, the UE receives the PDCCH sent by the base station; after the end of onduration, use the remaining MGL time to perform measurement again. For example, as shown in Scheme 1 in Fig. 9, when the MGL configured by the base station for UE is 6ms and the duration that onduration coincides with MGL is 1.5ms, the UE receives the PDCCH transmitted by the base station within 1.5ms when the collision occurs, and then uses the remaining MGL (i.e. 4.5ms) for performing measurement after the end of onduration;

[0115] ● Scheme 2: The base station configures a first MGL value and multiple second MGL values for the UE, and the second MGL values are smaller than the first MGL values. The UE normally performs measurement with the first MGL value, but if there is a conflict, it performs measurement with a smaller second MGL value that can avoid the conflict. For example, as shown in Scheme 2 in Fig. 9, the base station can configure a first MGL with a value of 6ms and a second MGL with a value of 4ms for the UE, and the UE normally uses the first MGL with a value of 6 ms. When a conflict occurs, if the duration of the conflict is 1.5ms, the UE can use the second MGL value of 4ms to avoid the conflict.

[0116] ● Scheme 3: The base station configures the UE with an offset value applied to the measurement gap. When a conflict occurs, as shown in Scheme 3 in Fig. 9, the offset value is applied for the starting time of measurement gap, thus avoiding the occurrence of the conflict. In this scheme, the value of MGL does not need to be changed, and the offset value can be sent to the UE together when the base station configures the measurement configuration for the UE, or it can be sent to the UE separately through other messages, which is not limited by the present invention.

[0117] For adaptively changing the related configuration of DRX, as shown in Fig. 10, if the measurement gap is partially overlapped with onduration, one or more of methods can be adopted:

[0118] ● Scheme 1: The base station configures the UE with an offset value applied to the starting time of onduration in DRX cycle. When a conflict occurs, as shown in Scheme 1 in Fig. 10, the starting time of onduration is offset according to the offset value, thus avoiding the conflict. In this scheme, the duration of onduration does not need to be changed, and the offset value can be sent to the UE together when the base station configures the DRX related configuration for the UE, or it can be sent to the UE separately through other messages, which is not limited by the present invention.

[0119] ● Scheme 2: In the overlapping part, that is, during the time when the collision occurs, the UE performs the radio resource (e.g. frequency) measurement; when the MG measurement is completed, use the remaining onduration time to receive the PDCCH sent by the base station. For example, as shown in Scheme 2 in Fig. 10, if the duration of onduration configured for UE by the base station is 4ms, and the duration that onduration coincides with MGL is 1.5ms, the UE will perform measurement within 1.5ms when the collision occurs, and then use the remaining onduration (that is, 2.5ms) to receive the PDCCH after the end of MG;

[0120] ● Scheme 3: The base station configures a first onduration value and several second onduration values for the UE, and the second onduration values are smaller than the first onduration value. The UE normally receives the PDCCH with the first onduration value, but if a collision occurs, it uses a smaller second onduration value to avoid the collision. For example, as shown in Scheme 3 in Fig. 10, the base station can configure the UE with a first onduration value of 4ms and a second onduration value of 2ms, and the UE normally uses the first onduration value of 4 ms. When a conflict occurs, if the duration of the conflict is 1.5ms, the UE can use the second onduration value of 2ms to avoid the conflict.

[0121] The third aspect: signaling enhancement in DC scenario.

[0122] In a dual-connection scenario, if it is the case of master node (MN) terminated Secondary Cell Group (SCG) bear, the MN can configure the UE with a discardTimerForLowImportance through PDCP configuration. The discardTimerForLowImportance is used to indicate the UE to discard an unimportant protocol data unit set (PDU set) when the network congestion occurs. The problem is that the SN-DU needs to transmit a MAC Control Element (MAC-CE) to the UE to activate or deactivate the function of PSI based SDU discard, but the MN will not transmit the PDCP configuration to the secondary node (SN). Therefore, SN-CU doesn't know that MN has configured discardTimerForLowImportance for UE, so SN-CU won't transmit the PSI based SDU Discard UL indicator to SN-DU, and SN-DU won't transmit a MAC-CE to UE to activate the function of PSI based SDU discard. Therefore, the invention proposes the following scheme:

[0123] ● After MN configures discardTimerForLowImportance for UE through PDCP configuration, if MN decides to add SN, then, in the first message (e.g., S-NODE ADDITION REQUEST and / or S-NODE MODIFICATION REQUEST), the PSI based Discard UL indicator is added to indicate that the MN has configured the function of PSI based Discard UL indicator. When the UE finds the uplink transmission congestion, the UE can discard the data packets (PDU and / or SDU) with low importance, which are determined based on the PDU Set Importance indicator corresponding to the data packets. When the SN receives this information, it knows that the MN has configured the function of PSI based Discard UL indicator. When the SN finds the uplink congestion, SN will transmit MAC CE to activate the function of PSI based Discard UL indicator for UE. If SN is a split base station architecture, SN is split into SN-CU and SN-DU, and SN-CU needs to transmit a fourth message to SN-DU.

[0124] The first message (e.g., S-NODE ADDITION REQUEST and / or S-NODE MODIFICATION REQUEST) may also contain the uplink traffic configuration information, which may be carried in the information element of UE assistance information, that is, the first message carries UE assistance information, and the UE assistance information contains the uplink traffic configuration information. The uplink traffic configuration information includes at least one of:

[0125] a jitter range, which contains the upper and lower bound of the jitter;

[0126] burst arrival time, the arrival time of data burst, which can be an absolute time or a reference time;

[0127] a traffic periodicity;

[0128] indication information or identification information of the protocol data unit set, which is set to "Yes" to indicate that the UE can identify the related information of the PDU set.

[0129] The uplink traffic configuration information received by SN can be used to calculate discontinuous reception-related parameters, such as determining the DRX cycle according to the traffic periodicity, and determining the starting time of DRX according to the burst arrival time and jitter range.

[0130] ● SN-CU transmits PSI based SDU Discard UL indicator to SN-DU through the fourth message if it finds that the first message (such as S-NODE ADDITION REQUEST and / or S-NODE MODIFICATION REQUEST) contains PSI based Discard UL indicator;

[0131] ● After SN-DU receives the PSI based SDU Discard UL indicator sent by SN-CU, when SN-DU finds uplink congestion, for example, through the buffer status report reported by UE, SN-DU finds uplink transmission congestion, and SN-DU transmits MAC CE to UE to activate the function of PSI based SDU Discard. When the uplink congestion is eliminated, SN-DU transmits MAC CE to UE to deactivate the function of PSI based SDU Discard.

[0132] In case of the master node terminated split bearer, both MN-DU and SN-DU can transmit MAC-CE to UE to activate or deactivate the function of PSI based SDU Discard. But which DU transmits the MAC-CE and how the UE executes the MAC-CE sent by the corresponding DU are also problems to be solved, so the present invention proposes the following scheme:

[0133] ● MN decides whether MN-DU or SN-DU transmits PSI-based SDU Discard Activation / Deactivation MAC CE:

[0134] ■ When MN decides that PSI-based SDU Discard Activation / Deactivation MAC CE is sent by MN-DU:

[0135] ∨ The MN-CU transmits a PSI based SDU Discard UL indicator to the MN-DU through the fifth message, and the MN-DU transmits the MAC-CE to the UE after receiving the indicator;

[0136] ∨ After the UE receives the MAC-CE, if one of the MN path and SN path is congested, the UE discards the whole PDU set affected by the congestion;

[0137] ■ When MN decides that PSI-based SDU Discard Activation / Deactivation MAC CE is sent by SN-DU:

[0138] ∨ MN-CU transmits PSI-based SDU Discard UL indicator to SN-CU through a sixth message, and SN-CU transmits the indicator to SN-DU through the fourth message, and SN-DU transmits the MAC-CE to UE after receiving the PSI-based SDU Discard UL indicator;

[0139] ∨ After the UE receives the MAC-CE, if one of the MN path and SN path is congested, the UE discards the whole PDU set affected by the congestion;

[0140] ● Both MN-DU and SN-DU can transmit PSI-based SDU Discard Activation / Deactivation MAC CE to UE:

[0141] ■ The MN-CU transmits the PSI-based SDU Discard UL indicator to the MN-DU through the fifth message. The MN-CU can also transmit a PSI-based SDU Discard UL indicator to the SN-CU through the sixth message;

[0142] ■ After receiving the indicator, MN-DU transmits the MAC-CE to UE.

[0143] ∨ UE only discards the PDU set affected on MN path;

[0144] ∨ Or the UE only discards the PDU set on the path affected by the congestion;

[0145] ■ SN-DU transmits the MAC-CE to UE after receiving the indicator.

[0146] ∨ UE only discards the PDU set affected on SN path;

[0147] ∨ Or the UE only discards the PDU set on the path affected by the congestion;

[0148] In case of secondary node (SN) terminated Master Cell Group (MCG) bear, SN should inform MN and ask MN-DU to transmit PSI-based SDU Discard Activation / Deactivation MAC CE to UE. The specific method is as follows:

[0149] ● SN adds PSI based SDU Discard UL indicator in the second message (such as S-NODE ADDITION REQUEST ACKNOWLEDGE and / or S-NODE MODIFICATION REQUEST ACKNOWLEDGE) and transmits it to MN;

[0150] ● After receiving the indicator, the MN-CU transmits it to the MN-DU through the fifth message, and the MN-DU transmits the MAC-CE to the UE.

[0151] Before establishing dual connection, if MN-DU has activated the function of PSI based SDU Discard for UE, some PDUs in the low-importance PDU set may have been discarded by UE. At this time, if SN is added, MN needs to inform SN that the UE has activated the function of PSI based SDU Discard. The specific method is as follows:

[0152] ● In the first message (e.g. S-NODE ADDITION REQUEST and / or S-NODE MODIFICATION REQUEST), the MN adds the indication information of whether the UE has been activated with the function of PSI based SDU Discard, which can also be called the initial state of the PSI-Based SDU Discard of the UE;

[0153] ● After SN receives it, a PSI based SDU Discard UL indicator can be added in the second message (such as S-NODE ADDITION REQUEST ACKNOWLEDGE and / or S-NODE MODIFICATION REQUEST ACKNOWLEDGE) to indicate whether the MN will continue or stop the function.

[0154] L4S (Low Latency, Low Loss and Scalable Throughput) congestion control has been proposed to solve the problem of network congestion in the non-dual connection scenario of XR service. However, how to apply L4S congestion control mechanism between MN and SN is also a problem that needs to be solved in the present invention for dual connection scenarios. In the dual-connection scenario, in the case of MN-terminated SCG bearer and SN-terminated SCG bearer as shown in Fig. 11, the Explicit Congestion Notification (ECN) marking on the RAN side, the explicit congestion notification marking on the UPF side and the related nodes of Congestion information request should perform the following operations:

[0155] ● Explicit Congestion Notification (ECN) marking on the RAN side:

[0156] ■ SN reports the percentage of ECN markings to MN;

[0157] ■ SN-DU reports the percentage of ECN markings to SN-CU-UP;

[0158] ■ The node handling PDCP performs ECN markings inthe IP packet header.

[0159] ● Explicit congestion notification marking on UPF side:

[0160] ■ SN reports the percentage of ECN markings;

[0161] ■ SN-DU reports the percentage of ECN markings;

[0162] ■ The nodes handling PDCP reports the percentage of ECN markings;

[0163] ● Congestion information request:

[0164] ■ SN reports the congestion percentage;

[0165] ■ SN-DU reports the congestion percentage;

[0166] ■ The node handling PDCP reports the congestion percentage;

[0167] According to the above analysis, SN needs to know whether the core network has sent the explicit congestion notification marking or the congestion information reporting request, which requires MN to inform SN after receiving the explicit congestion notification marking or the congestion information reporting request sent by the core network. The specific scheme is as follows:

[0168] ● The MN adds an ECN marking or congestion information reporting request in a first message (e.g., S-NODE ADDITION REQUEST and / or S-NODE MODIFICATION REQUEST), so as to inform the SN to execute the explicit congestion notification marking or congestion information reporting;

[0169] ● SN adds an ECN marking or congestion information reporting status in a second message (e.g., S-NODE ADDITION REQUEST ACKNOWLEDGE and / or S-NODE MODIFICATION REQUEST ACKNOWLEDGE), so as to report ECN marking and / or congestion related information;

[0170] In the case of split bearer, different PDUs in the same PDU set may be transmitted through MN path and SN path respectively. However, whether MN and SN use the same PDU Set QoS Parameters for data transmission of different PDUs in the same PDU set is also a problem to be solved.

[0171] One embodiment is that when different PDUs in the same PDUs set are transmitted through MN path and SN path respectively, if cell handover occurs at this time, the target cell may not know the remaining PDU set delay budget (PSDB), so it cannot schedule the remaining PDUs to be transmitted in the PDUs set in time. Therefore, the invention proposes the following methods:

[0172] ● The source cell adds the remaining PSDB in the handover request to the target cell;

[0173] ● The target cell handles the PDUs to be transmitted in the PDU set according to the remaining PSDB;

[0174] When different PDUs in the same PDUs set are transmitted through MN path and SN path respectively, if one node discards one or several PDUs in the PDU set at this time, another node does not need to buffer other PDUs in the PDU set. Therefore, the invention proposes the following methods:

[0175] ● When one node in the dual connection discards a PDU in a PDU set, a third message is sent to another node through the Xn interface, and the third message is used to inform the node that one or several PDUs in a PDU set have been discarded;

[0176] ● After receiving the third message, another node discards other PDUs buffered in the same PDU set.

[0177] The fourth aspect: enhancement in the scene of CU-DU split.

[0178] When the network is aware of that the uplink data transmission is congested, it can transmit the fifth indication information to the UE, and the fifth indication information can be UL bit rate indication, rate indication or other names, which is not limited by the present invention. The fifth indication information may indicate the uplink data transmission rate of the UE per QoS flow level. When the UE receives the fifth indication information, it will adjust the data transmission rate on the corresponding QoS flow according to the fifth indication information. One embodiment is that the network can transmit the fifth indication information through MAC CE. In the scenario of CU-DU split, DU transmits MAC CE to UE. But DU doesn't know which packets are transmitted through which QoS flow, so it can't judge which QoS flow where uplink data transmission is congested, and it can't indicate the uplink data transmission rate of UE per QoS flow level. Therefore, in order for DU to transmit the fifth indication information to UE through MAC CE, it is necessary for CU to provide some assistance information to DU. The corresponding processes and signaling enhancements are as follows:

[0179] ● The CU transmits a seventh message to the DU, and the seventh message contains the first assistance information.

[0180] a) The seventh message is a F1AP message, which can be a UE CONTEXT SETUP REQUEST, a UE CONTEXT MODIFICATION REQUEST, or other F1AP messages, which is not limited by the present invention.

[0181] b) The first assistance information may be a new IE, such as QoS flow related assistance information IE, or an existing IE, such as DRB QoS IE, which is not limited by the present invention. It may include at least one of the following:

[0182] i. a QoS flow ID list that needs to limit its uplink data transmission rate, which is used to indicate to DU which QoS flow needs to limit its uplink data transmission rate;

[0183] ii. a data rate corresponding to the QoS flow ID list that limits its uplink data transmission rate, which is used to indicate to DU the size of the uplink data transmission rate corresponding to the QoS flow included in the first assistance information;

[0184] iii. a QoS flow ID list that can limit its uplink data transmission rate, which is used to indicate to DU which QoS flow can limit its uplink data transmission rate, and finally which QoS flows are limited are decided by DU according to the list;

[0185] iv. a QoS flow ID list with uplink data transmission congestion, which is used to indicate to DU which QoS flow where uplink data transmission is congested;

[0186] ● When the DU receives the seventh message containing the first assistance information, it can transmit the MAC CE to the UE, and the MAC CE contains the sixth indication information, which can include at least one of the following:

[0187] ■ a QoS flow ID list that needs to limit its uplink data transmission rate;

[0188] ■ a data rate corresponding to the QoS flow ID list that limits its uplink data transmission rate;

[0189] ● After receiving the MAC CE, the UE can adjust the uplink transmission rate of the corresponding QoS flow according to the sixth indication information in the MAC CE, so as to alleviate the uplink transmission congestion.

[0190] Fig. 12 illustrates a schematic diagram of a node in a wireless communication system according to an embodiment of the present disclosure.

[0191] As shown in Fig. 12, a node (which may be, for example, a first node (e.g., a RAN node), a second node (e.g., a UE node) or any other network node as described above) according to an embodiment of the present disclosure may include a transceiver 1210, a memory 1220, and a processor 1230. The transceiver 1210, the memory 1220, and the processor 1230 of the base station may operate according to a communication method of the base station described above. However, the components of the base station are not limited thereto. For example, the base station may include more or fewer components than those described above. In addition, the processor 1230, the transceiver 1210, and the memory 1220 may be implemented as a single chip. Also, the processor 1230 may include at least one processor. Furthermore, the base station of FIG. 12 corresponds to the node of the above descriptions.

[0192] The transceiver 1210 collectively refers to a base station receiver and a base station transmitter, and may transmit / receive a signal to / from a terminal(UE) or a network entity. The signal transmitted or received to or from the terminal or a network entity may include control information and data. The transceiver 1210 may include a RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and a RF receiver for amplifying low-noise and down-converting a frequency of a received signal. However, this is only an example of the transceiver 1210 and components of the transceiver 1210 are not limited to the RF transmitter and the RF receiver.

[0193] Also, the transceiver 1210 may receive and output, to the processor 1230, a signal through a wireless channel, and transmit a signal output from the processor 1230 through the wireless channel.

[0194] The memory 1220 may store a program and data required for operations of the base station. Also, the memory 1220 may store control information or data included in a signal obtained by the base station. The memory 1220 may be a storage medium, such as read-only memory (ROM), random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.

[0195] The processor 1230 may control a series of processes such that the base station operates as described above. For example, the transceiver 1210 may receive a data signal including a control signal transmitted by the terminal, and the processor 1230 may determine a result of receiving the control signal and the data signal transmitted by the terminal.

[0196] Fig. 13 illustrates a schematic diagram of a user equipment in a wireless communication system according to an embodiment of the present disclosure.

[0197] As shown in FIG. 13, the UE according to an embodiment may include a transceiver 1310, a memory 1320, and a processor 1330. The transceiver 1310, the memory 1320, and the processor 1330 of the UE may operate according to a communication method of the UE described above. However, the components of the UE are not limited thereto. For example, the UE may include more or fewer components than those described above. In addition, the processor 1330, the transceiver 1310, and the memory 1320 may be implemented as a single chip. Also, the processor 1330 may include at least one processor. Furthermore, the UE of FIG. 13 corresponds to the UE or terminal of the above descriptions.

[0198] The transceiver 1310 collectively refers to a UE receiver and a UE transmitter, and may transmit / receive a signal to / from a base station or a network entity. The signal transmitted or received to or from the base station or a network entity may include control information and data. The transceiver 1310 may include a RF transmitter for up-converting and amplifying a frequency of a transmitted signal, and a RF receiver for amplifying low-noise and down-converting a frequency of a received signal. However, this is only an example of the transceiver 1310 and components of the transceiver 1310 are not limited to the RF transmitter and the RF receiver.

[0199] Also, the transceiver 1310 may receive and output, to the processor 1330, a signal through a wireless channel, and transmit a signal output from the processor 1330 through the wireless channel.

[0200] The memory 1320 may store a program and data required for operations of the UE. Also, the memory 1320 may store control information or data included in a signal obtained by the UE. The memory 1320 may be a storage medium, such as read-only memory (ROM), random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.

[0201] The processor 1330 may control a series of processes such that the UE operates as described above. For example, the transceiver 1310 may receive a data signal including a control signal transmitted by the base station or the network entity, and the processor 1330 may determine a result of receiving the control signal and the data signal transmitted by the base station or the network entity.

[0202] Those skilled in the art will understand that the various illustrative logical blocks, modules, circuits, and steps described in this application may be implemented as hardware, software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in the form of their functional sets. Whether such function sets are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Technicians may implement the described functional sets in different ways for each specific application, but such design decisions should not be interpreted as causing a departure from the scope of this application.

[0203] In the above-described embodiments of the disclosure, all operations and messages may be selectively performed or may be omitted. In addition, the operations in each embodiment do not need to be performed sequentially, and the order of operations may vary. Messages do not need to be transmitted in order, and the transmission order of messages may change. Each operation and transfer of each message can be performed independently.

[0204] Although the figures illustrate different examples of user equipment, various changes may be made to the figures. For example, the user equipment can include any number of each component in any suitable arrangement. In general, the figures do not limit the scope of this disclosure to any particular configuration(s). Moreover, while figures illustrate operational environments in which various user equipment features disclosed in this patent document can be used, these features can be used in any other suitable system.

[0205] The various illustrative logic blocks, modules, and circuits described in this application may be implemented or performed by a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logics, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0206] The steps of the method or algorithm described in this application may be embodied directly in hardware, in a software module executed by a processor, or in a combination thereof. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, or any other form of storage medium known in the art. A storage medium is coupled to a processor to enable the processor to read and write information from / to the storage media. In an alternative, the storage medium may be integrated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in the user terminal as discrete components.

[0207] In one or more designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function may be stored as one or more pieces of instructions or codes on a computer-readable medium or delivered through it. The computer-readable medium includes both a computer storage medium and a communication medium, the latter including any medium that facilitates the transfer of computer programs from one place to another. The storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.

[0208] While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.

Claims

1.A method performed by a first node in a wireless communication system, the method comprising:transmitting, to a second node, a request message including first information indicating a protocol data unit set importance (PSI) based service data unit (SDU) discard for an uplink (UL) or second information indicating an explicit congestion notification (ECN) marking or a congestion information reporting; andreceiving, from the second node, a request acknowledging message as a response to the request message.2.The method of claim 1,wherein the request message is a s-node addition request message, a s-node modification request message, or a user equipment (UE) context setup request message,wherein the first information indicates whether the PSI based SDU discard for the UL is configured to the first node, andwherein the second information indicates whether the ECN marking or the congestion information reporting is active.3.The method of claim 1,wherein the response message is a s-node addition request acknowledge message, a s-node modification request acknowledge message, or a UE context setup response message, andwherein the response message includes information indicating whether the PSI based SDU discard for the UL is configured to the second node or information indicating whether the ECN marking or the congestion information reporting is active.4.The method of claim 1,wherein the first node includes a master node (MN) or gNodeB-central unit (gNB-CU), andwherein the second node includes a secondary node (SN) or a gNB-distributed unit (gNB-DU).5.A method performed by a second node in a wireless communication system, the method comprising:receiving, from a first node, a request message including first information indicating a protocol data unit set importance (PSI) based service data unit (SDU) discard for an uplink (UL) or second information indicating an explicit congestion notification (ECN) marking or a congestion information reporting; andtransmitting, to the first node, a request acknowledging message as a response to the request message.6.The method of claim 5,wherein the request message is a s-node addition request message, a s-node modification request message, or a user equipment (UE) context setup request message,wherein the first information indicates whether the PSI based SDU discard for the UL is configured to the first node, andwherein the second information indicates whether the ECN marking or the congestion information reporting is active.7.The method of claim 5,wherein the response message is a s-node addition request acknowledge message, a s-node modification request acknowledge message, or a UE context setup response message, andwherein the response message includes information indicating whether the PSI based SDU discard for the UL is configured to the second node or information indicating whether the ECN marking or the congestion information reporting is active.8.The method of claim 5,wherein the first node includes a master node (MN) or gNodeB-central unit (gNB-CU), andwherein the second node includes a secondary node (SN) or a gNB-distributed unit (gNB-DU).9.A first node in a wireless communication system, the first node comprising:a transceiver; andat least one processor coupled with the transceiver and configured to:transmit, to a second node, a request message including first information indicating a protocol data unit set importance (PSI) based service data unit (SDU) discard for an uplink (UL) or second information indicating an explicit congestion notification (ECN) marking or a congestion information reporting, andreceive, from the second node, a request acknowledging message as a response to the request message.10.The first node of claim 9,wherein the request message is a s-node addition request message, a s-node modification request message, or a user equipment (UE) context setup request message,wherein the first information indicates whether the PSI based SDU discard for the UL is configured to the first node, andwherein the second information indicates whether the ECN marking or the congestion information reporting is active.11.The first node of claim 9,wherein the response message is a s-node addition request acknowledge message, a s-node modification request acknowledge message, or a UE context setup response message, andwherein the response message includes information indicating whether the PSI based SDU discard for the UL is configured to the second node or information indicating whether the ECN marking or the congestion information reporting is active.12.The first node of claim 9,wherein the first node includes a master node (MN) or gNodeB-central unit (gNB-CU), andwherein the second node includes a secondary node (SN) or a gNB-distributed unit (gNB-DU).13.A second node in a wireless communication system, the second node comprising:a transceiver; andat least one processor coupled with the transceiver and configured to:receive, from a first node, a request message including first information indicating a protocol data unit set importance (PSI) based service data unit (SDU) discard for an uplink (UL) or second information indicating an explicit congestion notification (ECN) marking or a congestion information reporting, andtransmit, to the first node, a request acknowledging message as a response to the request message.14.The second node of claim 13,wherein the request message is a s-node addition request message, a s-node modification request message, or a user equipment (UE) context setup request message,wherein the first information indicates whether the PSI based SDU discard for the UL is configured to the first node, andwherein the second information indicates whether the ECN marking or the congestion information reporting is active.15.The second node of claim 13,wherein the response message is a s-node addition request acknowledge message, a s-node modification request acknowledge message, or a UE context setup response message, andwherein the response message includes information indicating whether the PSI based SDU discard for the UL is configured to the second node or information indicating whether the ECN marking or the congestion information reporting is active.

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