Method and device for data transmission

Abstract

The present application relates to a user equipment, a base station, a core network and a method for data transmission. The user equipment transmits capability information to the core network for indicating to the core network at least one downlink data transmission process supported by the user equipment. The core network transmits a first paging message to the base station. The base station transmits a second paging message to the user equipment. After receiving the second paging message, the user equipment selects a downlink data transmission process from the at least one downlink data transmission process.

Description

Technical Field

[0001] The present disclosure relates generally to data transmission, and more particularly to early data transmission. Background Art

[0002] In order to improve the efficiency of data transmission, early data transmission (EDT) technology is introduced for some networks, such as narrowband Internet of Things (NB-IoT), enhanced machine type communication (eMTC), etc. EDT includes mobile originated EDT (MO-EDT) and mobile terminated EDT (MT-EDT).

[0003] For MT-EDT, after receiving the paging, the user equipment needs to start the downlink data reception process to receive the downlink data. There are many types of downlink data reception processes applied by the user equipment based on the requirements of data transmission. However, the specific details of applying the same downlink data reception process for the base station, user equipment and core network have not been discussed, and there are still some problems that need to be solved. Summary of the invention

[0004] One embodiment of the present disclosure provides a method of a user equipment, wherein the method includes: receiving a paging message from a base station; and after receiving the paging message, selecting a downlink data transmission process from at least one downlink data transmission process.

[0005] Another embodiment of the present disclosure provides a method of a core network. The method includes: transmitting a paging message to a base station, wherein the paging message includes user equipment information corresponding to the user equipment, and at least one of data size information and user equipment service type information.

[0006] Another embodiment of the present disclosure provides a method of a base station. The method includes: receiving a first paging message from a core network or another base station, wherein the first paging message includes user equipment information corresponding to a user equipment; and determining a downlink data transmission process of the user equipment after receiving the first paging message.

[0007] Another embodiment of the present disclosure provides a method of a base station, wherein the method includes: transmitting a paging message to another base station so that the other base station determines a downlink data transmission process of a user equipment, wherein the paging message includes user equipment information corresponding to the user equipment.

[0008] Another embodiment of the present disclosure provides a device. According to an embodiment of the present disclosure, the device includes: at least one non-transitory computer-readable medium having computer-executable instructions stored therein; at least one receiving circuit system; at least one transmitting circuit system; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuit system, and the at least one transmitting circuit system, wherein the at least one non-transitory computer-readable medium and the computer-executable instructions are configured to use the at least one processor to cause the device to perform a method according to an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] To describe the manner in which the advantages and features of the present disclosure can be obtained, the description of the present disclosure is presented by reference to specific embodiments of the present disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the present disclosure and therefore should not be considered limiting of its scope.

[0010] Figure 1 A wireless communication system according to an embodiment of the present disclosure is described.

[0011] Figures 2A to 2D is a schematic diagram of message transmission between wireless communication systems according to an embodiment of the present disclosure.

[0012] Figure 3 A wireless communication system according to an embodiment of the present disclosure is described.

[0013] Figures 4A to 4D is a schematic diagram of message transmission between wireless communication systems according to an embodiment of the present disclosure.

[0014] Figures 5A to 5D A flow chart illustrating a method for wireless communication according to an embodiment of the present disclosure.

[0015] Figures 6A to 6D A flow chart illustrating a method for wireless communication according to an embodiment of the present disclosure.

[0016] Figure 7 An example block diagram illustrating an apparatus according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0017] The detailed description of the accompanying drawings is intended as a description of the preferred embodiments of the present disclosure, and is not intended to represent the only form in which the present disclosure can be practiced. It should be understood that the same or equivalent functions can be implemented by different embodiments intended to be included in the spirit and scope of the present disclosure.

[0018] refer to Figure 1 , the wireless communication system 100 may include a user equipment (UE) 101, a base station (BS) 102, and a core network (CN) 103. Figure 1 A specific number of UEs 101, BSs 102, and CNs 103 are depicted in FIG. 1 , but it is contemplated that any number of UEs 101, BSs 102, and CNs 103 may be included in the wireless communication system 100.

[0019] CN 103 may include a core access and mobility management function (AMF) entity. BS 102, which may communicate with CN 103, may operate or work under the control of the AMF entity. CN 103 may further include a user plane function (UPF) entity, which is communicatively coupled to the AMF entity.

[0020] BS 102 may be distributed throughout a geographic area. In certain embodiments of the present application, BS 102 may also be referred to as an access point, an access terminal, a base station, a base station unit, a macro cell, a Node B, an evolved Node B (eNB), a gNB, a home Node B, a relay node or a device, or described using other terms used in the art. BS 102 is typically part of a radio access network, which may include one or more controllers communicatively coupled to one or more corresponding BSs.

[0021] For example, UE 101 may include, but is not limited to, computing devices such as desktop computers, laptop computers, personal digital assistants (PDAs), tablet computers, smart TVs (e.g., TVs connected to the Internet), set-top boxes, game consoles, security systems (including security cameras), vehicle-mounted computers, network devices (e.g., routers, switches, and modems), Internet of Things (IoT) devices, or the like.

[0022] According to some embodiments of the present application, for example, UE 101 may include (but is not limited to) a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network.

[0023] In some embodiments of the present application, for example, UE 101 may include (but not limited to) a wearable device, such as a smart watch, a fitness bracelet, an optical head-mounted display, or the like. In addition, UE 101 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terms used in the art. UE 101 may communicate directly with BS 102 via uplink communication signals.

[0024] The wireless communication system 100 may be compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a network based on time division multiple access (TDMA), a network based on code division multiple access (CDMA), a network based on orthogonal frequency division multiple access (OFDMA), a long term evolution (LTE) network, a network based on 3GPP, a 5G network based on 3GPP, a satellite communication network, a high altitude platform network, and / or other communication networks.

[0025] In some embodiments of the present application, the wireless communication system 100 is compatible with 5G New Radio (NR) of the 3GPP protocol or 5G NR-light of the 3GPP protocol, wherein the BS 102 transmits data using an OFDM modulation scheme on a downlink (DL), and the UE 101 transmits data using a single carrier frequency division multiple access (SC-FDMA) or OFDM scheme on an uplink (UL). However, more generally, the wireless communication system 100 may implement some other open or proprietary communication protocols, such as WiMAX, and other protocols.

[0026] In some embodiments of the present application, BS 102 may communicate using other communication protocols, such as the IEEE 802.11 wireless communication protocol family. Further, in some embodiments of the present application, BS 102 may communicate on a licensed spectrum, while in other embodiments, BS 102 may communicate on an unlicensed spectrum. The present application is not intended to be limited to implementations of any particular wireless communication system architecture or protocol. In still other embodiments of the present application, BS 102 may communicate with UE 101 using 3GPP5G protocols.

[0027] According to some existing protocols for mobile terminated early data transfer (MT-EDT), after receiving a paging with a UE identification record, UE 101 may need to initiate a DL data reception procedure to receive DL data. Some types of DL data reception procedures may be candidates to be applied by UE 101 based on the requirement of small data transmission or 10 Mbps data rate in NR-Light.

[0028] In some embodiments, the DL data reception process may include: (1) a random access (RA) process based on message 2 (Msg.2); (2) a RA process based on message 4 (Msg.4); (3) a 2-step RA process; (4) a conventional RA process; (5) a pre-configured uplink resource process; and (6) a process in which DL information is transmitted in a paging message.

[0029] Specifically, in the Msg.2-based RA procedure, the BS 102 may transmit some DL data to the UE 101 by responding to the RA preamble (i.e., the message 1 of the MT-EDT) through the RA response (i.e., the message 2 of the MT-EDT). In the Msg.4-based RA procedure, the BS 102 may transmit some DL data to the UE 101 at Msg.4 of the RA in response to the message (i.e., the message 3 of the RA procedure). In the 2-step RA procedure, the BS 102 may transmit some DL data to the UE 101 by responding to the response of Msg.A (i.e., the message B of the 2-step RA procedure).

[0030] In a conventional RA procedure, BS 102 may transmit some DL data to UE 101 after UE 101 enters connected mode (i.e., the first DL message after UE 101 enters connected mode). In a preconfigured uplink resource procedure with possible preamble-free transmission, after uplink information is transmitted from UE 101 to BS 102 at preconfigured uplink resources (PUR), BS 102 may transmit some DL data to UE 101. However, the specific details of UE 101, BS 102, and CN 103 applying the same DL data reception procedure have not been discussed, and there are still some issues that need to be addressed.

[0031] refer to Figure 2A During a non-access stratum (NAS) procedure between UE 101, BS 102, and CN 103, UE 103 may report capability information 101C to CN 103. In particular, different UEs or UE services may support different DL data transmission procedures. Therefore, UE 101 may need to report its capability information 101C for indicating to CN 103 at least one DL data transmission procedure supported by UE 101.

[0032] In detail, during the NAS process, the UE 101 may transmit the capability information 101C to the AMF entity of the CN 103 via the BS 102. In some embodiments, the capability information 101C may be used to indicate to the AMF entity at least one DL data transmission process supported by the UE 101. More specifically, in some embodiments, when the UE 101 is in an idle state or an inactive state, the capability information 101C may be used to indicate to the AMF entity at least one DL data transmission process supported by the UE 101.

[0033] In some embodiments, when the UE 101 is in an idle state or an inactive state, the capability information 101C may include at least one preferred process of at least one DL data transmission process. Therefore, after receiving the capability information 101C having at least one preferred process from the UE 101, when the UE 101 is in an idle state or an inactive state, the at least one preferred process of the UE 101 may be indicated to the AMF entity of the CN 103.

[0034] For example, when UE 101 supports three types of DL data transmission procedures, which are type "A", type "B" and type "C", and the preferred procedure of UE 101 is type "A", UE 101 transmits capability information 101C to the AMF entity of CN 103 for indicating to the AMF entity that UE 101 supports type "A", type "B" and type "C". DL data transmission procedures and the preferred procedure of UE 101 are type "A". Subsequently, after receiving the capability information 101C from UE 101, the AMF entity is indicated that UE 101 supports type "A", type "B" and type "C" DL data transmission procedures, and the preferred procedure of UE 101 is type "A". In some implementations, the preferred procedure of UE 101 may include one or more DL data transmission procedures. For example, the preferred procedure of UE 101 may be a 2-step RA procedure and a PUR procedure. Alternatively, UE 101 may implicitly transmit the preferred procedure by transmitting an indication indicating the service type required by UE 101. In other words, a service type may be associated with a preference process.

[0035] In some embodiments, the capability information 101C may include ranking information of the priority of at least one DL data transmission process. Therefore, after receiving the capability information 101C with ranking information from the UE 101, the priority of at least one DL data transmission process of the UE 101 may be indicated to the AMF entity of the CN 103.

[0036] For example, when the UE 101 supports three types of DL data transmission procedures, which are type "X", type "Y", and type "Z", and the ranking information includes a priority order of type "Y", type "X", and type "Z" from high to low, the UE 101 transmits capability information 101C to the AMF entity of the CN 103 for indicating to the AMF entity that the UE 101 supports type "X", type "Y", and type "Z" DL data transmission procedures, and the priority order from high to low is type "Y", type "X", and type "Z". Subsequently, after receiving the capability information 101C from the UE 101, the AMF entity is indicated that the UE 101 supports type "X", type "Y", and type "Z" DL data transmission procedures, and the priority order from high to low is type "Y", type "X", and type "Z".

[0037] During the NAS procedure, the AMF entity of the CN 103 may determine the UE configuration information 103C of the UE 101. In some embodiments, the UE configuration information 103C may include a determined DL data transmission procedure supported by the UE 101 when the UE 101 is in an idle state or an inactive state. In some embodiments, when the UE 101 is in an idle state or an inactive state, the UE configuration information 103C may include ranking information of a priority of at least one DL data transmission procedure supported by the UE 101. In some embodiments, the AMF entity of the CN 103 may transmit the UE configuration information 103C to the UE 101 via the BS 102 during the NAS procedure. In some embodiments, the NAS procedure may include at least one of a Tracking Area Update (TAU) procedure and an Attach procedure of LTE or New Radio (NR).

[0038] In some embodiments, UE 103 may enter an idle state after the NAS process. Then, when CN 103 needs to transmit DL data to UE 101, the AMF entity of CN 103 may transmit a paging message 103P to BS 102 serving UE 101. Paging message 103P may include UE information of UE 101 (e.g., UE identity of UE 101) and UE configuration information 103C. BS 102 may determine the DL data transmission process of UE 101 according to UE configuration information 103C.

[0039] Next, BS 102 may transmit a paging message 102P to UE 101. Paging message 102P may include a process indication. After receiving paging message 102P, UE 101 may select a DL data transmission process according to the process indication, so that UE 101 may receive DL data from BS 102 according to the DL data transmission process.

[0040] In some embodiments, the paging message may include available resources for an idle state or an inactive state of UE 101. In detail, the available resources may be used to explicitly or implicitly indicate to UE 101 a process selected as a DL data transmission process. The available resources may be at least one of the following resources: (1) resources of Msg.1 for a RA process based on Msg.2; (2) resources of Msg.1 for a RA process based on Msg.4; (3) resources of Msg.A for a 2-step RACH process; (4) resources of Msg.1 for a conventional RA process; (5) resources of a preconfigured uplink resource process; or (6) resources of DL data in a paging message or scheduling information of DL data in a paging message.

[0041] In some embodiments, the process indication may indicate to UE 101 to select a DL data transmission process from one of the following DL data transmission processes: (1) a RA process based on Msg.2; (2) a RA process based on Msg.4; (3) a 2-step RACH process; (4) a conventional RA process; (5) a preconfigured uplink resource process; and (6) a process in which DL information is transmitted in a paging message.

[0042] In addition, in some embodiments, there may be a default setting of a process set configured in UE 101 and BS 102. The process set may be set to include at least one of the following: (1) RA process based on Msg.2; (2) RA process based on Msg.4; (3) 2-step RACH process; (4) pre-configured uplink resource process; (5) 4-step RACH process; (6) conventional RA process; and (7) a process in which DL information is transmitted in a paging message. In addition, the process set may be:

[0043] Set A includes the RA process based on Msg.2, the RA process based on Msg.4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process;

[0044] Set B includes the RA process based on Msg.4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process;

[0045] Set C includes a 2-step RACH procedure, a 4-step RACH procedure, and a preconfigured uplink resource procedure;

[0046] Set D includes 2-step RACH process, 4-step RACH process, pre-configured uplink resource process and conventional RA process;

[0047] Set E includes a 2-step RACH process and a preconfigured uplink resource process;

[0048] Set F includes the 2-step RACH process, the preconfigured uplink resource process, and the conventional RA process;

[0049] Set G includes the 4-step RACH process, the pre-configured uplink resource process, and the conventional RA process;

[0050] Set H includes a 4-step RACH process and a preconfigured uplink resource process;

[0051] Set I includes a 2-step RACH procedure and a 4-step RACH procedure; or

[0052] Set J includes a 2-step RACH procedure, a 4-step RACH procedure, and a normal RA procedure.

[0053] It should be noted that in some embodiments, the 4-step RACH procedure may include a RACH procedure applied by UE 101 to receive DL data at the Msg.2 step in a Msg.2-based RA procedure, or at the Msg.4 step in a Msg.4-based RA procedure. In some embodiments, the 4-step RACH procedure may include a RACH procedure applied by UE 101 to transmit UL data at the Msg.3 step of some RA procedures.

[0054] In these embodiments, the process indication indicates to the UE 101 to select a DL data transmission process from one element of the process set. For example, when the default setting of the process set A is configured in the UE 101 and the BS 102, the process indication indicates to the UE 101 to select a DL data transmission process from one of the following: a RA process based on Msg.2, a RA process based on Msg.4, a 2-step RACH process, a pre-configured uplink resource process, and a conventional RA process.

[0055] refer to Figure 2B In some embodiments, the 2-step RACH procedure may be applied as a DL data transmission procedure between the UE 101 and the BS 102. Specifically, the procedure indication from the BS 102 indicates to the UE 101 that the 2-step RACH procedure is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, the UE 101 may apply the 2-step RACH procedure as the DL data transmission procedure.

[0056] Next, UE 101 may transmit a Message A preamble (i.e., a Message A preamble of a 2-step RACH procedure) to BS 102, and transmit a Message A UL Physical Uplink Shared Channel (PUSCH) (i.e., a Message A UL PUSCH of a 2-step RACH procedure) to BS 102. UE 101 may then receive a Message B Response with DL data (i.e., a Message B Response of a 2-step RACH procedure) from BS 102.

[0057] refer to Figure 2C In some embodiments, the RA procedure based on Msg.4 may be applied as a DL data transmission procedure between UE 101 and BS 102. Specifically, the procedure indication from BS 102 indicates to UE 101 that the RARACH procedure based on Msg.4 is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, UE 101 may apply the RA procedure based on Msg.4 as the DL data transmission procedure.

[0058] Next, UE 101 may transmit a Message 1 preamble (i.e., a Message 1 preamble of a RA procedure based on Mag. 4) to BS 102. UE 101 may receive a Message 2 RA response (i.e., a Message 2 RA response of a RA procedure based on Mag. 4) from BS 102. UE 101 may transmit a Message 3 (i.e., a Message 3 of a RA procedure based on Msg. 4) to BS 102. Then, UE 101 may receive a Message 4 including DL data (i.e., a Message 4 of a RA procedure based on Msg. 4) from BS 102.

[0059] refer to Figure 2D In some embodiments, the RA procedure based on Msg.2 may be applied as a DL data transmission procedure between UE 101 and BS 102. Specifically, the procedure indication from BS 102 indicates to UE 101 that the RACH procedure based on Msg.2 is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, UE 101 may apply the RA procedure based on Msg.2 as the DL data transmission procedure.

[0060] Next, UE 101 may transmit a message 1 preamble (ie, a message 1 preamble of a RA procedure based on Mag. 2) to BS 102. Then, UE 101 may receive a message 2 including DL data (ie, a message 2 of a RA procedure based on Msg. 2) from BS 102.

[0061] In some embodiments, the preconfigured uplink resource process may include the step of preamble transmission, or may not have the step of preamble transmission. In detail, for the preconfigured uplink resource process without the step of preamble transmission, UE 101 may be given preconfigured uplink resources. Then, UE 101 may transmit UL data in the given preconfigured uplink resources, and receive DL data after transmitting on the given preconfigured uplink resources. On the other hand, for the preconfigured uplink resource process with the step of preamble transmission, UE 101 may be given preconfigured uplink resources and preamble information. Then, UE 101 may determine the preamble according to the preamble information, transmit the preamble and UL data in the given preconfigured uplink resources, and receive DL data after transmitting the given preconfigured uplink resources.

[0062] In some embodiments, for a conventional RA procedure, UE 101 may receive DL data or transmit UL data after UE 101 enters connected mode. In some embodiments, for a procedure in which DL information is transmitted in a paging message, the paging message may include UE identification information, and at least one of DL data information of UE 101 or scheduling information about DL data of UE 101.

[0063] refer to Figure 3 , the wireless communication system 100 may further include a BS 104. In some embodiments, the BS 102 may be a base station serving the UE 101, and the BS 104 may be the last serving base station.

[0064] refer to Figure 4A During the NAS process between UE 101, BS 102, BS 104 and CN 103, UE 103 may report capability information 101C to CN 103. The AMF entity of CN 103 may determine UE configuration information 103C of UE 101.

[0065] In some embodiments, UE 103 may enter an inactive state after the NAS process. Then, when CN 103 needs to transmit DL data to UE 101, the AMF entity of CN 103 may transmit a paging message 103P to BS 104, which is the last serving base station of UE 101. Paging message 103P may include the UE identity of UE 101 and UE configuration information 103C of UE 101.

[0066] Next, BS 104 may transmit a paging message 104P to BS 102. In some embodiments, paging message 104P may include a UE identity of UE 101 and UE configuration information 103C of UE 101. Therefore, BS 102 may determine a DL data transmission procedure of UE 101 according to UE configuration information 103C. In some embodiments, BS 104 may determine a DL data transmission procedure of UE 101 according to UE configuration information 103C, and paging message 104P includes an indication indicating the DL data transmission procedure of UE 101 to BS 102.

[0067] In some embodiments, the UE configuration information may include at least one of UE context information and UE capability information about the UE supporting the DL data transmission process. Similar to the above embodiments, the capability information of these embodiments may include ranking information of the priority of at least one DL data transmission process. Therefore, after receiving the capability information with ranking information from UE 101, the priority of at least one DL data transmission process of UE 101 may be indicated to the AMF entity of CN 103.

[0068] Next, BS 102 may transmit a paging message 102P to UE 101. Paging message 102P may include a process indication. After receiving paging message 102P, UE 101 may select a DL data transmission process according to the process indication, so that UE 101 may receive DL data from BS 102 according to the DL data transmission process.

[0069] refer to Figure 4B In some embodiments, the 2-step RACH procedure may be applied as a DL data transmission procedure between the UE 101 and the BS 102. Specifically, the procedure indication from the BS 102 indicates to the UE 101 that the 2-step RACH procedure is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, the UE 101 may apply the 2-step RACH procedure as the DL data transmission procedure.

[0070] Next, UE 101 may transmit a Message A preamble (i.e., a Message A preamble of a 2-step RACH procedure) to BS 102 and a Message A UL PUSCH (i.e., a Message A UL PUSCH of a 2-step RACH procedure) to BS 102. UE 101 may then receive a Message B Response with DL data (i.e., a Message B preamble of a 2-step RACH procedure) from BS 102.

[0071] refer to Figure 4C In some embodiments, the RA procedure based on Msg.4 may be applied as a DL data transmission procedure between UE 101 and BS 102. Specifically, the procedure indication from BS 102 indicates to UE 101 that the RACH procedure based on Msg.4 is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, UE 101 may apply the RA procedure based on Msg.4 as the DL data transmission procedure.

[0072] Next, UE 101 may transmit a Message 1 preamble (i.e., a Message 1 preamble of a RA procedure based on Mag. 4) to BS 102. UE 101 may receive a Message 2 RA response (i.e., a Message 2 RA response of a RA procedure based on Mag. 4) from BS 102. UE 101 may transmit a Message 3 (i.e., a Message 3 of a RA procedure based on Msg. 4) to BS 102. Then, UE 101 may receive a Message 4 including DL data (i.e., a Message 4 of a RA procedure based on Msg. 4) from BS 102.

[0073] refer to Figure 4D In some embodiments, the RA procedure based on Msg.2 may be applied as a DL data transmission procedure between UE 101 and BS 102. Specifically, the procedure indication from BS 102 indicates to UE 101 that the RACH procedure based on Msg.2 is selected as the DL data transmission procedure. Then, after receiving the paging message 102P with the procedure indication, UE 101 may apply the RA procedure based on Msg.2 as the DL data transmission procedure.

[0074] Next, UE 101 may transmit a message 1 preamble (ie, a message 1 preamble of a RA procedure based on Mag. 2) to BS 102. Then, UE 101 may receive a message 2 including DL data (ie, a message 2 of a RA procedure based on Msg. 2) from BS 102.

[0075] In some embodiments, the process indication may indicate step information at which DL data should be transmitted. Specifically, the process indication may indicate to UE 101 to receive DL data in the following steps: (1) a step corresponding to message B of a 2-step RACH process; (2) a step corresponding to message 2 after a preamble of an RA process based on Msg.2; (3) a step corresponding to message 2 after preconfigured uplink resources; (4) a step corresponding to message 4 after message 3 of an RA process based on Msg.4; or (5) a step after entering a connected mode in the network through an RA process.

[0076] In some embodiments, the process indication may indicate step information that UL data should be required. Specifically, the process indication may indicate to UE 101 that UL data is transmitted in the following steps: (1) a step corresponding to message A of a 2-step RACH process; (2) a step corresponding to message 3 after message 2 of an RA process based on Msg.2; (3) a step of applying preconfigured uplink resources; (4) a step corresponding to message 3 before message 4 of an RA process based on Msg.4; (5) a step before downloading data initially transmitted from BS 102; (6) a step after downloading data initially transmitted from BS 102; or (7) a step after entering a connected mode in the network through an RA process.

[0077] In some embodiments, the paging message 103P may further include at least one of data size information and UE service type information. In detail, the AMF entity of the CN 103 may transmit the data size information and / or service type information of the UE 101 with the paging message 103P to the BS 104. After receiving the data size information and / or service type information of the UE 101, the BS 104 may transmit the data size information and service type information of the UE 101 to the BS 102. In some embodiments, the data size information may indicate to the BS 102 whether small data transmission or a Msg.4 / Msg.2-based RA procedure may be initiated.

[0078] In some embodiments, the service type information may indicate a UE service type. For example, the UE service type includes an emergency service, a time-tolerant service, a service with quality of service (QoS) information, a service with QoS class identification (QCI) information, a small data transmission service, or a service requiring the UE 101 to be in a connected mode.

[0079] Further, the UE service type may indicate that the UE 101 may transmit feedback corresponding to the DL transmission. In other words, depending on the UE service type, the UE 101 may need to transmit feedback corresponding to the DL transmission. On the other hand, the UE service type may indicate that the UE 101 may not transmit feedback corresponding to the DL transmission. In other words, depending on the UE service type, the UE 101 may not need to transmit feedback corresponding to the DL transmission.

[0080] In some embodiments, when BS 102 supports the selected DL data transmission procedure, the DL data transmission procedure may be initiated as the selected DL data transmission procedure between UE 101 and BS 102. In some embodiments, when BS 102 does not support the selected DL data transmission procedure, the DL data transmission procedure may be initiated as a regular RA procedure between UE 101 and BS 102.

[0081] In some embodiments, BS 102 may broadcast a system information block (SIB) to UE 101, and the SIB may include support, enable, or disable DL data transmission procedures of BS 102. Subsequently, UE 101 may receive the SIB from BS 102 and be indicated the support or enable DL data transmission procedures of BS 102. In some embodiments, paging message 102P may include some DL data or scheduling information of DL data.

[0082] In some embodiments, BS 102 may transmit information of the DL data transmission process to neighboring base stations (not shown) in the same RAN-based notification area (RNA). Thus, the neighboring base stations may be notified of the DL data transmission process of UE 101. In some embodiments, the neighboring base stations may include anchor base stations. In detail, the anchor base station may be a designated serving base station to transmit / receive data to / from UE 101 in a given frame. In some embodiments, the neighboring base station may include the last serving base station of UE 101.

[0083] Figures 5A to 5D A flowchart illustrating a method for wireless communication according to some embodiments of the present application. Figure 5A In some embodiments of the present application, method 500 is performed by a UE (eg, UE 101), a BS (eg, BS 102) and a CN (eg, CN 103).

[0084] Operation S501 is performed to transmit capability information from the UE to the CN for indicating to the CN at least one DL data transmission process supported by the UE. Operation S502 is performed to determine, by the CN, UE configuration information of the UE according to the capability information of the UE. The UE configuration information may include a determined DL data transmission process of the UE in an idle state or an inactive state. Operation S503 is performed to transmit, by the CN, the UE configuration information to the UE. Operations S501 to S503 may be performed during a NAS process.

[0085] When the UE is in an idle state and the CN needs to transmit DL data to the UE, operation S504 is performed so that the CN transmits a first paging message to the BS serving the UE. The first paging message may include a UE identifier and UE configuration information of the UE. Operation S505 is performed so that the BS determines a DL data transmission process of the UE 101 according to the UE configuration information. Operation S506 is performed so that the BS transmits a second paging message to the UE. The second paging message may include a process indication. After the UE receives the second paging message, operation S507 is performed so that the UE selects a DL data transmission process according to the process indication.

[0086] In some embodiments, the process indication may indicate to the UE to select a DL data transmission process from one of the following DL data transmission processes: (1) a RA process based on Msg.2; (2) a RA process based on Msg.4; (3) a 2-step RACH process; (4) a conventional RA process; (5) a preconfigured uplink resource process; (6) a 4-step RACH process and (7) a process in which DL information is transmitted in a paging message.

[0087] In addition, in some embodiments, there may be a default setting of a process set configured in the UE and the BS. The process set may be set to include at least one of the following: (1) RA process based on Msg.2; (2) RA process based on Msg.4; (3) 2-step RACH process; (4) pre-configured uplink resource process; (5) 4-step RACH process; (6) conventional RA process, and (7) a process in which DL information is transmitted in a paging message. In addition, the process set may be:

[0088] Set A includes the RA process based on Msg.2, the RA process based on Msg.4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process;

[0089] Set B includes the RA process based on Msg.4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process;

[0090] Set C includes a 2-step RACH procedure, a 4-step RACH procedure, and a preconfigured uplink resource procedure;

[0091] Set D includes 2-step RACH process, 4-step RACH process, pre-configured uplink resource process and conventional RA process;

[0092] Set E includes a 2-step RACH process and a preconfigured uplink resource process;

[0093] Set F includes the 2-step RACH process, the preconfigured uplink resource process, and the conventional RA process;

[0094] Set G includes the 4-step RACH process, the pre-configured uplink resource process, and the conventional RA process;

[0095] Set H includes a 4-step RACH process and a preconfigured uplink resource process;

[0096] Set I includes a 2-step RACH procedure and a 4-step RACH procedure; or

[0097] Set J includes a 2-step RACH procedure, a 4-step RACH procedure, and a normal RA procedure.

[0098] In these embodiments, the process indication indicates to the UE to select a DL data transmission process from an element of the process set.

[0099] refer to Figure 5B In some embodiments, the 2-step RACH process may be applied as a DL data transmission process between the UE and the BS. Specifically, the process indication from the BS indicates to the UE that the 2-step RACH process is selected as the DL data transmission process.

[0100] Operation S508a is performed to transmit a Message A preamble (i.e., a Message A preamble of a 2-step RACH procedure) to the BS by the UE. Operation S509a is performed to transmit a Message A UL PUSCH (i.e., a Message A UL PUSCH of a 2-step RACH procedure) to the BS by the UE. Operation S510a is performed to transmit a Message B Response with DL data (i.e., a Message B Response of a 2-step RACH procedure) to the UE by the BS. Operation S511a is performed to receive a Message B Response with DL data from the BS by the UE.

[0101] refer to Figure 5C In some embodiments, the RA procedure based on Msg.4 may be applied as a DL data transmission procedure between the UE and the BS. Specifically, the procedure indication from the BS indicates to the UE that the RARACH procedure based on Msg.4 is selected as the DL data transmission procedure.

[0102] Operation S508b is performed to transmit, by the UE, a message 1 preamble (i.e., a message 1 preamble of a RA procedure based on Mag.4) to the BS. Operation S509b is performed to transmit, by the BS, a message 2 RA response (i.e., a message 2 RA response of a RA procedure based on Mag.4) to the UE. Operation S510b is performed to transmit, by the UE, a message 3 (i.e., a message 3 of a RA procedure based on Msg.4) to the BS. Operation S511b is performed to transmit, by the BS, a message 4 containing DL data (i.e., a message 4 of a RA procedure based on Msg.4) to the UE. Operation S512b is performed to receive, by the UE, a message 4 containing DL data from the BS.

[0103] refer to Figure 5D In some embodiments, the RA procedure based on Msg.2 may be applied as a DL data transmission procedure between the UE and the BS. Specifically, the procedure indication from the BS indicates to the UE that the RA RACH procedure based on Msg.2 is selected as the DL data transmission procedure.

[0104] Operation S508c is performed to transmit a message 1 preamble (i.e., a message 1 preamble of a RA procedure based on Mag.2) to the BS by the UE. Operation S509c is performed to transmit a message 2 containing DL data (i.e., a message 2 of a RA procedure based on Msg.2) to the UE by the BS. Operation S510c is performed to receive a message 2 containing DL data from the BS by the UE.

[0105] Figures 6A to 6D A flowchart illustrating a method for wireless communication according to some embodiments of the present application. Fig. 6A In some embodiments of the present application, method 600 is performed by UE (eg, UE 101), BS1 (eg, BS 102), BS2 (eg, BS 104) and CN (eg, CN 103).

[0106] Operation S601 is performed to transmit capability information from the UE to the CN for indicating to the CN at least one DL data transmission process supported by the UE. Operation S602 is performed to determine, by the CN, UE configuration information of the UE according to the capability information of the UE. The UE configuration information may include a determined DL data transmission process of the UE in an idle state or an inactive state. Operation S603 is performed to transmit, by the CN, the UE configuration information to the UE. Operations S601 to S603 may be performed during a NAS process.

[0107] When the UE is in an inactive state and the CN needs to transmit DL data to the UE, operation S604 is performed so that the CN transmits a first paging message to BS2, which is the last serving base station of the UE. The first paging message may include a UE identifier and UE configuration information of the UE. Operation S605 is performed so that BS2 transmits a second paging message to BS1. Operation S606 is performed so that BS1 determines a DL data transmission process.

[0108] In some embodiments, the second paging message may include a UE identifier and UE configuration information of the UE. In operation S606, BS1 may determine the DL data transmission process of the UE according to the UE configuration information. In some embodiments, BS2 may determine the DL data transmission process of the UE according to the UE configuration information, and the second paging message includes an indication indicating the DL data transmission process of the UE to BS1. Therefore, in operation S606, BS1 may determine the DL data transmission process of the UE according to the indication of the second paging message.

[0109] Operation S607 is performed to transmit the third paging message to the UE by BS1. The third paging message may include a process indication. After the UE receives the third paging message, operation S608 is performed to select a DL data transmission process by the UE according to the process indication.

[0110] refer to Figure 6B In some embodiments, the 2-step RACH procedure may be applied as a DL data transmission procedure between the UE and BS 1. Specifically, the procedure indication from BS 1 indicates to the UE that the 2-step RACH procedure is selected as the DL data transmission procedure.

[0111] Operation S609a is performed to transmit, by the UE, a Message A preamble (i.e., a Message A preamble of a 2-step RACH procedure) to BS1. Operation S610a is performed to transmit, by the UE, a Message A UL PUSCH (i.e., a Message A UL PUSCH of a 2-step RACH procedure) to BS1. Operation S611a is performed to transmit, by BS1, a Message B Response with DL data (i.e., a Message B Response of a 2-step RACH procedure) to the UE. Operation S612a is performed to receive, by the UE, a Message B Response with DL data from BS1.

[0112] refer to Figure 6C In some embodiments, the RA procedure based on Msg.4 may be applied as a DL data transmission procedure between the UE and BS1. Specifically, the procedure indication from BS1 indicates to the UE that the RA RACH procedure based on Msg.4 is selected as the DL data transmission procedure.

[0113] Operation S609b is performed to transmit, by the UE, a message 1 preamble (i.e., a message 1 preamble of a RA procedure based on Mag.4) to BS1. Operation S610b is performed to transmit, by BS1, a message 2 RA response (i.e., a message 2 RA response of a RA procedure based on Mag.4) to the UE. Operation S611b is performed to transmit, by the UE, a message 3 (i.e., a message 3 of a RA procedure based on Msg.4) to BS1. Operation S612b is performed to transmit, by BS1, a message 4 containing DL data (i.e., a message 4 of a RA procedure based on Msg.4) to the UE. Operation S613b is performed to receive, by the UE, a message 4 containing DL data from BS1.

[0114] refer to Fig.6D In some embodiments, the RA procedure based on Msg.2 may be applied as a DL data transmission procedure between the UE and BS1. Specifically, the procedure indication from BS1 indicates to the UE that the RA RACH procedure based on Msg.2 is selected as the DL data transmission procedure.

[0115] Operation S609c is performed to transmit, by the UE, a message 1 preamble (i.e., a message 1 preamble of a RA procedure based on Mag. 2) to BS 1. Operation S610c is performed to transmit, by BS 1, a message 2 containing DL data (i.e., a message 2 of a RA procedure based on Msg. 2) to the UE. Operation S611c is performed to receive, by the UE, a message 2 containing DL data from BS 1.

[0116] In some embodiments, the process indication of method 500 or 600 may indicate step information that DL data should be transmitted. Specifically, the process indication may indicate to the UE that DL data is received in the following steps: (1) a step corresponding to message B of a 2-step RACH process; (2) a step corresponding to message 2 after a preamble of an RA process based on Msg.2; (3) a step corresponding to message 2 after preconfigured uplink resources; (4) a step corresponding to message 4 after message 3 of an RA process based on Msg.4; or (5) a step after entering a connected mode in the network through an RA process.

[0117] In some embodiments, the process indication of method 500 or 600 may indicate step information that UL data should be required. Specifically, the process indication may indicate to the UE that UL data is transmitted in the following steps: (1) a step corresponding to message A of a 2-step RACH process; (2) a step corresponding to message 3 after message 2 of an RA process based on Msg.2; (3) a step of applying preconfigured uplink resources; (4) a step corresponding to message 3 before message 4 of an RA process based on Msg.4; (5) a step before downloading data initially transmitted from BS 102; (6) a step after downloading data initially transmitted from BS 102; or (7) a step after entering a connected mode in the network through an RA process.

[0118] In some embodiments, the CN of method 600 may include an AMF entity and may transmit the data size information and / or service type information of the UE to BS 2. After receiving the data size information and / or service type information of the UE, BS 2 may transmit the data size information and / or service type information of the UE to BS 1.

[0119] In some embodiments, when BS / BS1 supports the selected DL data transmission procedure, the DL data transmission procedure of method 500 or 600 may be initiated as the selected DL data transmission procedure between the UE and BS / BS1. In some embodiments, when BS / BS1 does not support the selected DL data transmission procedure, the DL data transmission procedure of method 500 or 600 may be initiated as a regular RA procedure between the UE and BS / BS1.

[0120] In some embodiments, BS / BS1 of method 500 or 600 may broadcast SIB to UE, and the SIB may include supported DL data transmission procedures of BS / BS1. Subsequently, UE may receive SIB from BS / BS1 and be indicated the supported DL data transmission procedures of BS / BS1.

[0121] In some embodiments, the BS / BS1 of the method 500 or 600 may transmit information of the DL data transmission process to neighboring base stations in the same RNA. Therefore, the neighboring base stations may be informed of the UE's DL data transmission process.

[0122] Figure 7 An example block diagram illustrating an apparatus 70 according to an embodiment of the present disclosure.

[0123] like Figure 7 As shown in FIG. 7 , apparatus 70 may include at least one non-transitory computer-readable medium ( Figure 7 ), receiving circuit system 701, transmitting circuit system 703 and coupling to non-transitory computer readable medium ( Figure 7The device 70 may include a processor 705 (not shown), a receiving circuit system 701, and a transmitting circuit system 703. The device 70 may be a user equipment, a base station, or an AMF entity of a core network.

[0124] Although in this figure, elements such as processor 705, transmit circuit system 703, and receive circuit system 701 are described in singular form, plural form may be considered unless limitation to the singular is explicitly stated. In some embodiments of the present invention, receive circuit system 701 and transmit circuit system 703 are combined into a single device, such as a transceiver. In certain embodiments of the present disclosure, apparatus 70 may further include an input device, a memory, and / or other components.

[0125] In some embodiments of the present disclosure, the user equipment information may include UE identity information. For example, the UE identity information may be the value of UE 5G-S-TMSI, 5G-S-TMSI mode 1024, or a default value.

[0126] In some embodiments of the present disclosure, a non-transitory computer-readable medium may have computer-executable instructions stored thereon to cause a processor to implement the method with respect to a base station as described above. For example, when executed, the computer-executable instructions cause the processor 705 to interact with the receiving circuit system 701 and the transmitting circuit system 703 to perform the method with respect to Figure 1 and 3 The operation of the BS depicted in .

[0127] In some embodiments of the present disclosure, a non-transitory computer-readable medium may have computer-executable instructions stored thereon to cause a processor to implement a method with respect to a user equipment as described above. For example, when executed, the computer-executable instructions cause the processor 70 to interact with the receiving circuit system 701 and the transmitting circuit system 703 to perform the method with respect to Figure 1 and 3 The operation of the UE depicted in .

[0128] In some embodiments of the present disclosure, a non-transitory computer-readable medium may have computer-executable instructions stored thereon to cause a processor to implement a method with respect to a user equipment as described above. For example, when executed, the computer-executable instructions cause the processor 70 to interact with the receiving circuit system 701 and the transmitting circuit system 703 to perform the method with respect to Figure 1 and 3 Operations of the CN (e.g., the AMF entity of the CN) as depicted in FIG.

[0129] Those of ordinary skill in the art will appreciate that the operations of the methods described in conjunction with the aspects disclosed herein may be embodied directly in hardware, in software modules executed by a processor, or in a combination of both. The software modules may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In addition, in some aspects, the steps of the methods may reside as one or any combination or set of codes and / or instructions on a non-transitory computer-readable medium that may be incorporated into a computer program product.

[0130] Although the present disclosure has been described with its specific embodiments, it is apparent that many alternatives, modifications and variations may be apparent to those skilled in the art. For example, the various components of the embodiments may be interchanged, added or replaced in other embodiments. In addition, all elements of each figure are not necessary for the operation of the disclosed embodiments. For example, it will enable a person of ordinary skill in the art of the disclosed embodiments to make and use the teachings of the present disclosure by simply adopting the elements of the independent claims. Therefore, the embodiments of the present disclosure as set forth herein are intended to be illustrative, not restrictive. Various changes may be made without departing from the spirit and scope of the present disclosure.

[0131] In this document, the term "includes, including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a list of elements not only comprises these elements, but may comprise other elements that are not explicitly listed or inherent to such processes, methods, articles or equipment. The element with "a, an" or the like in front does not exclude the presence of additional identical elements in the process, method, article or equipment comprising the element without more constraints. In addition, the term "another" is defined as at least the second or more. The term "having" and the like as used herein are defined as "comprising".

Claims

1. A method for a user to equip a UE, comprising: sending capability information to a base station, the capability information indicating for a core network one or more downlink data transmission procedures supported by the UE, wherein the capability information indicates a preferred downlink data transmission procedure of the UE when in an idle state or an inactive state, or wherein the capability information indicates a respective priority of each of the one or more downlink data transmission procedures of the UE when in the idle state or the inactive state; receiving a paging message from the base station; and Based on the received paging message, a downlink data transmission process is selected.

2. The method according to claim 1, wherein the paging message includes available resources of the UE when in the idle state or the inactive state.

3. The method according to claim 1, wherein the paging message includes an indication of the downlink data transmission process, wherein the downlink data transmission process is selected according to the indication, and the method further comprises: Downlink data is received from the base station according to the selected downlink data transmission procedure.

4. The method according to claim 3, wherein the downlink data transmission procedure is selected from one of the following: a mobile terminated MT random access RA procedure based on message 2, a MT RA procedure based on message 4, a 2-step random access channel RACH procedure, a pre-configured uplink resource procedure or a regular RA procedure.

5. The method of claim 3, wherein selecting the downlink data transmission process from one of a set of processes comprises: At least one of a Msg.2-based RA procedure, a Msg.4-based RA procedure, a 2-step RACH procedure, a preconfigured uplink resource procedure, a 4-step RACH procedure, a conventional RA procedure, or a procedure in which downlink information is received in a paging message; The MT RA process based on message 2, the MT RA process based on message 4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process; The MT RA process based on message 4, the 2-step RACH process, the pre-configured uplink resource process and the conventional RA process; The 2-step RACH process, the 4-step RACH process and the pre-configured uplink resource process; The 2-step RACH process, the 4-step RACH process, the pre-configured uplink resource process and the conventional RA process; The two-step RACH process and the pre-configured uplink resource process; The two-step RACH process, the pre-configured uplink resource process and the conventional RA process; The 4-step RACH process, the pre-configured uplink resource process and the conventional RA process; The 4-step RACH process and the pre-configured uplink resource process; The 2-step RACH procedure and the 4-step RACH procedure; or The 2-step RACH process, the 4-step RACH process and the conventional RA process.

6. The method according to claim 3, wherein the downlink data is received in the following steps: the step of message B of a 2-step random access channel RACH procedure, the step of message 2 after a preamble, the step of message 2 after preconfigured uplink resources, the step of message 4 after message 3, or the step after entering a connected mode in the network through a RA procedure.

7. The method according to claim 3, wherein the uplink data is transmitted in the following steps: the step of message A of the 2-step random access channel RACH procedure, the step of message 3 after message 2, the step of applying the preconfigured uplink resources, the step of message 3 before message 4, the step before downloading the data initially transmitted from the base station, the step after downloading the data initially transmitted from the base station, or the step after entering the connection mode in the network through the RA procedure.

8. The method according to claim 1, wherein the core network includes a core access and mobility management function (AMF) entity, and the method further comprises: Receive user equipment configuration information from the AMF entity, wherein the user equipment configuration information includes a determined downlink data transmission process of the user equipment when in the idle state or the inactive state.

9. The method according to claim 8, wherein the determined downlink data transmission process comprises at least one preference process of the at least one downlink data transmission process.

10. The method according to claim 8, wherein the determined downlink data transmission process comprises a priority of the at least one downlink data transmission process.

11. The method according to claim 1, further comprising: Initiate a subsequent downlink data transmission process, wherein when the base station supports the selected downlink data transmission process, the subsequent downlink data transmission process is initiated as the selected downlink data transmission process, or when the base station does not support the selected downlink data transmission process, the subsequent downlink data transmission process is initiated as a regular random access RA process.

12. The method according to claim 1, further comprising: A system information block (SIB) is received from the base station, wherein the SIB includes supporting, enabling or disabling a downlink data transmission procedure of the base station when the UE is in the idle state or the inactive state.

13. The method of claim 1, wherein the paging message contains downlink data or scheduling information for downlink data.

14. The method of claim 1, wherein the capability information is transmitted during a Non-Access Stratum (NAS) procedure.

15. A core network method, comprising: receiving capability information from a user equipment, the capability information indicating, for the core network, one or more downlink data transmission procedures supported by the UE, wherein the capability information indicates a preferred downlink data transmission procedure of the UE when in an idle state or an inactive state, or wherein the capability information indicates a respective priority of each of the one or more downlink data transmission procedures of the UE when in the idle state or the inactive state; and A paging message is transmitted to a base station, wherein the paging message includes user equipment information corresponding to the user equipment, and at least one of data size information and service type information of the user equipment.

16. The method according to claim 15, wherein the core network comprises a core access and mobility management function (AMF) entity, and the method further comprises: Transmitting user equipment configuration information to the user equipment, wherein the user equipment configuration information includes a determined downlink data transmission procedure for the user equipment when in the idle state or the inactive state.

17. The method of claim 15, wherein the capability information is received from the user equipment during a non-access stratum (NAS) procedure.

18. The method according to claim 15, wherein the user equipment service type information indicates: Small data transfer services; requesting the user equipment to transmit feedback corresponding to a downlink transmission; or The user equipment is not required to transmit feedback corresponding to downlink transmissions.

19. A method of a base station, comprising: receiving a first paging message from a core network or another base station, wherein the first paging message includes user equipment information corresponding to a user equipment, wherein the user equipment information includes capability information corresponding to the user equipment, and the capability information indicates a preferred downlink data transmission process, or a respective priority of each of one or more downlink data transmission processes; and A downlink data transmission procedure of the user equipment is determined after receiving the first paging message.

20. The method of claim 19, wherein the first paging message from the another base station includes an indication of the downlink data transmission process, and the downlink data transmission process is determined according to the indication.

21. The method of claim 19, wherein the downlink data transmission process is determined according to the user equipment information.

22. The method of claim 19, further comprising: At least one of data size information of the user equipment and user equipment service type information is received from the core network or the other base station.

23. The method according to claim 22, wherein the user equipment service type information indicates: Small data transfer services; requesting the user equipment to transmit feedback corresponding to a downlink transmission; or The user equipment is not required to transmit feedback corresponding to downlink transmissions.

24. The method of claim 19, further comprising: A second paging message is transmitted to the user equipment, wherein the second paging message includes a process indication for the user equipment to select the downlink data transmission process when in an idle state or an inactive state.

25. The method of claim 19, further comprising: The downlink data is transmitted to the user equipment according to the downlink data transmission procedure.

26. The method of claim 19, further comprising: A system information block (SIB) is transmitted to the user equipment, wherein the SIB contains support, enabling or disabling of downlink data transmission procedures of the base station for the user equipment when in an idle state or an inactive state.

27. The method of claim 19, further comprising: The information of the downlink data transmission process is transmitted to the neighboring base stations.

28. The method of claim 27, wherein the neighboring base station comprises an anchor base station.

29. The method of claim 27, wherein the neighboring base station comprises the another base station.

30. The method of claim 27, wherein the base station and the neighboring base station are located in the same RAN-based notification area (RNA).

31. A method of a base station, comprising: A paging message is transmitted to another base station for the other base station to determine a downlink data transmission process of a user equipment, wherein the paging message includes user equipment information corresponding to the user equipment, wherein the user equipment information includes capability information corresponding to the user equipment, and the capability information indicates a preferred downlink data transmission process, or a corresponding priority of each of one or more downlink data transmission processes.

32. The method of the base station according to claim 31, further comprising: The information of the downlink data transmission process is received from the another base station.

33. The method of claim 31, wherein the paging message includes an indication of the downlink data transmission process, and the downlink data transmission process is determined according to the indication.

34. The method of claim 31, wherein the downlink data transmission process is determined according to the user equipment information.

35. The method of claim 31, further comprising: At least one of the data size information of the user equipment and the service type information of the user equipment is transmitted to the another base station.

36. The method of claim 35, further comprising: At least one of the data size information and the user equipment service type information of the user equipment is received from a core network.

37. The method of claim 35, wherein the user equipment service type information indicates: Small data transfer services; requesting the user equipment to transmit feedback corresponding to a downlink transmission; or The user equipment is not required to transmit feedback corresponding to downlink transmissions.

38. An apparatus comprising: a non-transitory computer-readable medium having computer-executable instructions stored thereon; Receiving circuit system; Transmitting circuit system; and a processor coupled to the non-transitory computer-readable medium, the receive circuitry, and the transmit circuitry; Wherein the computer executable instructions cause the processor to implement the method of any one of claims 1 to 37.

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