Method and apparatus for accelerating direct secondary cell activation

Abstract

Methods and apparatuses for accelerating direct secondary cell activation. A method for accelerating secondary cell (SCell) activation is proposed. Under the proposed enhanced direct SCell activation procedure, in addition to the TCI state information of the list of candidate TCI states, the network can also add the TCI state information of the SCell in the RRC signaling message when adding the SCell in the activated state. Upon receiving the RRC signaling message, the UE accordingly adds the SCell and then activates the SCell based on the received TCI state information. Since no additional time is needed to receive and process the TCI state information via a medium access control (MAC) control element (CE), the SCell activation time is reduced.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Provisional Application No. 63 / 094,922, filed October 22, 2020, entitled “Methods and Apparatus to Speed ​​up direct SCell Activation,” pursuant to 35 U.SC §119, the subject of which is incorporated herein by reference. Technical Field

[0003] The disclosed implementations generally relate to wireless communication, and more particularly to a method for accelerating secondary cell (SCell) activation in 5G New Radio (NR). Background Technology

[0004] Over the years, wireless communication networks have grown exponentially. Long-Term Evolution (LTE) systems offer high peak data rates, low latency, improved system capacity, and low operating costs due to their simple network architecture. LTE systems, also known as 4th Generation (4G) systems, also provide seamless integration with older wireless networks such as Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), and Universal Mobile Telecommunications System (UMTS). In LTE systems, the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) comprises multiple evolved Node-Bs (eNodeBs / eNBs) that communicate with multiple mobile stations called User Equipment (UEs). 3rd Generation Partner Project (3GPP) networks typically include a hybrid of 2G / 3G / 4G systems. The Next Generation Mobile Network (NGMN) Board has decided to focus future NGMN activities on defining end-to-end requirements for 5G New Radio (NR) systems.

[0005] In 4G / LTE, a feature called "Carrier Aggregation (CA)" is supported, allowing communication between the UE and the base station via multiple aggregated carriers or cells (e.g., a primary cell (PCell) and one or more secondary cells (SCells)). SCells are designed to provide more data bandwidth in other carrier frequencies (usually higher frequencies) to improve data throughput, while PCells are primarily used to ensure coverage. In CA, the UE is connected to a primary cell (PCell) and one or more secondary cells (SCells). CA functionality is also used in 5G / NR. In traditional designs, SCells can be added via radio resource control (RRC) reconfiguration. When added via RRC, the SCell is only in a deactivated state. After an SCell is added, it can be activated or deactivated via the MAC control element (CE). In LTE R15 and NR R16, direct SCell activation was introduced to accelerate the SCell activation process, allowing SCells to be activated directly via RRC (when a SCell is added). The MAC CE used for activation is not required in some cases, further reducing SCell activation time.

[0006] 5G NR frequency bands are divided into two distinct frequency ranges. Frequency Range 1 (FR1) includes sub-6GHz bands (some of which are traditionally used in previous standards but have been extended to cover potential new spectrum offerings from 410MHz to 7125MHz). Frequency Range 2 (FR2) includes bands from 24.25GHz to 52.6GHz. Compared to the bands in FR1, the bands in FR2 within this millimeter-wave range offer shorter distances but higher available bandwidth. For NR FR2 SCells, the UE needs to know the Transmission Configuration Indicator (TCI) status in order to correctly send Channel State Information (CSI) reports. The TCI status information contains the beam information for the FR2 cell. Therefore, for cases where TCI status is required (e.g., in FR2) and the TCI status has not yet been configured by the network, there is no significant benefit in accelerating overall SCell activation due to the TCI indication in the MAC. MAC CE is still required to provide TCI status, which introduces additional latency. As a result, the activation time of the FR2 SCell is not reduced by direct SCell activation.

[0007] A solution needs to be sought. Summary of the Invention

[0008] A method for accelerating secondary cell (SCell) activation is proposed. In the proposed enhanced direct SCell activation process, while adding SCells to be activated, the network can also add the SCell's TCI status information in the Radio Resource Control (RRC) signaling message, in addition to the Transmission Configuration Indicator (TCI) status information of the candidate TCI status list. Upon receiving the RRC signaling message, the UE adds the SCell accordingly and then activates it based on the received TCI status information. Since there is no additional time required to receive and process TCI status information via the Media Access Control (MAC) control element (CE), the SCell activation time is reduced.

[0009] In one implementation, the UE enters Radio Resource Control (RRC) connection mode in the primary cell of the mobile communication network. The UE receives RRC configuration from the network. The RRC configuration includes information for adding a secondary cell (SCell), information for activating the SCell, and a transmission configuration indictor (TCI) indication for the SCell. The UE activates the SCell using the corresponding TCI state indicated by the TCI indication. The activation time of the SCell is reduced by the time delay caused by MAC CE operation. The UE performs channel state information reference signal (CSI-RS) measurement and reporting for the activated SCell.

[0010] In another implementation, the gNB establishes a connection with the user equipment (UE) in the primary cell of the mobile communication network. The UE is in Radio Resource Control (RRC) connection mode. The gNB sends RRC configuration from the base station. The RRC configuration includes information for adding a secondary cell (SCell), information for activating the SCell, and a Transmission Configuration Indicator (TCI) indication for the SCell. The SCell is activated using the corresponding TCI state indicated by the TCI indication, and the activation time of the SCell is reduced by the time delay from MAC CE operation. The gNB receives the Channel State Information Reference Signal (CSI-RS) measurement results of the activated SCell from the UE.

[0011] Other embodiments and advantages are described in the following detailed description. This invention is not intended to be limited. The invention is defined by the claims. Attached Figure Description

[0012] The accompanying drawings illustrate embodiments of the invention, wherein similar reference numerals indicate similar components.

[0013] Figure 1 An exemplary 5G New Radio (NR) network supporting enhanced direct secondary cell (SCell) activation according to various aspects of the present invention is illustrated.

[0014] Figure 2 A simplified block diagram of a wireless device (e.g., UE and gNB) according to an embodiment of the present invention is shown.

[0015] Figure 3 A flowchart illustrating an enhanced direct secondary cell activation process according to an embodiment of the present invention is provided.

[0016] Figure 4The TCI process and SCell activation time are illustrated under normal SCell activation, direct SCell activation, and the proposed enhanced direct SCell activation.

[0017] Figure 5 An implementation of the operation of the UE during NR SCell activation and SCell activation time is illustrated within frequency range 2 (FR2).

[0018] Figure 6 Another implementation of the operation of the UE during NR SCell activation and SCell activation time is illustrated within frequency range 2 (FR2).

[0019] Figure 7 A flowchart illustrating a novel approach to accelerate SCell activation from the UE's perspective is provided.

[0020] Figure 8 A flowchart illustrating a novel approach to accelerate SCell activation from the perspective of the BS is provided. Detailed Implementation

[0021] Now, reference will be made in detail to some embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0022] Figure 1An exemplary 5G New Radio (NR) network 100 supporting enhanced secondary cell (SCell) activation according to various aspects of the present invention is illustrated. The 5G NR network 100 includes user equipment (UE) 110 communicatively connected to a base station ((BaseStation, BS) / gNB) or transmission point (TRP) (e.g., gNB / TRP 121) of an access network 120, which provides radio access using Radio Access Technology (RAT) (e.g., 5G NR technology). The access network 120 is connected to the 5G core network 110 via an NG interface, and more specifically, to the User Plane Function (UPF) via an NG user-plane part (NG-u), and to the Mobility Management Function (AMF) via an NG control-plane part (NG-c). For load balancing and redundancy purposes, a gNB can be connected to multiple UPFs / AMFs. UE 110 can be a smartphone, wearable device, Internet of Things (IoT) device, or tablet computer, etc. Alternatively, UE 110 can be a notebook (NB) or personal computer (PC) with a data card inserted or installed, the data card including a modem and RF transceiver to provide wireless communication capabilities.

[0023] gNB / TRP 121 can provide communication coverage for a geographical coverage area in which communication with UE 110 is supported via communication link 101. In one implementation, gNB / TRP 121 can be configured as a master node for serving UE 110, and the communication link 101 between gNB / TRP 121 and UE 110 can utilize one or more frequency carriers to form one or more cells (e.g., PCells and one or more SCells). The communication link 101 shown in the 5G NR network 100 can include the transmission of control plane data (such as SCell / PSCell add and activate commands) and reference signals (RS) from gNB / TRP 121 to UE 110 (e.g., via the Physical Downlink Control Channel (PDCCH) or the Physical Downlink Shared Channel (PDSCH)).

[0024] gNB / TRP 122 can provide communication coverage for a geographical coverage area in which communication with UE 110 is supported via communication link 102. In one embodiment, gNB / TRP 122 can be configured as a secondary node to serve UE 110, and the communication link 102 between gNB / TRP 122 and UE 110 can utilize one or more frequency carriers to form one or more cells (e.g., PSCell and one or more SCells). The communication link 102 shown in the 5G NR network 100 can include uplink transmissions from UE 110 to gNB / TRP 122 (e.g., via Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH)), or downlink transmissions from gNB / TRP 122 to UE 110 (e.g., via PDCCH or PDSCH).

[0025] In LTE Release 15 and NR Release 16, direct SCell activation was introduced to accelerate the secondary cell (SCell) activation process, allowing SCells to be activated directly via Radio Resource Control (RRC) (when adding a SCell). The Media Access Control (MAC) CE used for activation is not required in some cases, reducing SCell activation time. For NR FR2 SCells, the UE needs to know the Transmission Configuration Indicator (TCI) status to correctly send Channel State Information (CSI) reports. The TCI status includes configurations such as the quasi-co-location (QCL) relationship between the DLRS and PDSCH DMRS ports in a CSI-RS set. For example, the TCI status information contains the QCL relationship between the CSI-RS beams and the synchronization signaling block (SSB) beams in an FR2 cell. Under direct SCell activation, the RRC signaling message provides TCI status information (e.g., tci-StatesToAddModList), but the MAC CE is still required to provide the TCI status indication for the SCell. Therefore, for cases where TCI status is required and has not yet been configured by the network, there is no significant benefit in accelerating overall SCell activation due to the TCI indication in the MAC. The MAC CE is still required to provide the TCI status, which results in additional latency. Consequently, the activation time of FR2 SCells is not reduced by direct SCell activation.

[0026] Based on a novel aspect, a method for accelerating SCell activation is proposed. In the enhanced direct SCell activation process, when adding an SCell to be activated, the network provides a TCI status indication in the same RRC signaling message, in addition to the TCI status information in the candidate TCI status list. Upon receiving the RRC signaling message, the UE adds the SCell accordingly and then activates it based on the received TCI status indication. Since no additional time is required to receive and process the TCI status indication via the MAC CE, the SCell activation time is reduced.

[0027] Figure 2A simplified block diagram of a wireless device (e.g., UE 201 and gNB 211) according to an embodiment of the present invention in a 5G NR network 200 is illustrated. gNB 211 has an antenna 215 for transmitting and receiving radio signals. An RF transceiver module 214 coupled to the antenna 215 receives RF signals from the antenna 215, converts the RF signals into baseband signals, and transmits these baseband signals to a processor 213. The RF transceiver 214 also converts baseband signals received from the processor 213, converts these baseband signals into RF signals, and transmits these RF signals to the antenna 215. The processor 213 processes the received baseband signals and invokes different functional modules to perform functions in gNB 211. Memory 212 stores program instructions and data 220 to control the operation of gNB 211. Figure 2 In the example, gNB 211 also includes a protocol stack 280 and a set of control function modules and circuits 290. Protocol stack 280 may include: a Non-Access-Stratum (NAS) layer for communicating with AMF / SMF / MME entities connected to the core network; a Radio Resource Control (RRC) layer for upper-layer configuration and control; a Packet Data Convergence Protocol / Radio Link Control (PDCP / RLC) layer; a Media Access Control (MAC) layer; and a Physical (PHY) layer. In one example, control function modules and circuits 290 include SCell configurator circuit 291, which manages the configuration (e.g., addition / activation) of the UE 201's PSCell and one or more SCells by sending commands instructing SCell / PSCell addition / activation.

[0028] Similarly, UE 201 has a memory 202, a processor 203, and an RF transceiver module 204. The RF transceiver 204 is coupled to an antenna 205, receives RF signals from the antenna 205, converts these RF signals into baseband signals, and sends these baseband signals to the processor 203. The RF transceiver 204 also converts baseband signals received from the processor 203, converts these baseband signals into RF signals, and sends these RF signals to the antenna 205. The processor 203 processes the received baseband signals (e.g., including SCell / PSCell add / activate commands) and invokes different functional modules and circuits to perform functions in UE 201. The memory 202 stores data and program instructions 210 to be executed by the processor 203 to control the operation of UE 201. For example, suitable processors include: dedicated processors, digital signal processors (DSPs), multiple microprocessors, one or more microprocessors associated with a DSP core, controllers, microcontrollers, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and other types of integrated circuits (ICs) and / or state machines. The functionality of UE 201 can be implemented and configured using a software-associated processor.

[0029] UE 201 also includes a protocol stack 260 and a set of control function modules and circuits 270. Protocol stack 260 may include: a NAS layer for communicating with AMF / SMF / MME entities connected to the core network, an RRC layer for upper-layer configuration and control, a PDCP / RLC layer, a MAC layer, and a PHY layer. The control function modules and circuits 270 can be implemented and configured through software, firmware, hardware, and / or a combination thereof. These control function modules and circuits 270 interact with each other when executed by processor 203 via program instructions contained in memory 202 to allow UE 201 to perform implementations and functional tasks and functions within the network. In one example, the control function modules and circuits 270 include a connection processing circuit 271 for establishing and managing connections, and an SCell configuration circuit 272 for adding and activating SCells / PSCells based on TCI information provided in SCell / PSCell commands via RRC signaling.

[0030] Figure 3A sequential flowchart illustrating the enhanced secondary cell activation process according to an embodiment of the present invention is provided. In step 311, UE 301 establishes a connection with network 302 and enters RRC connection mode in the primary cell (PCell). In step 312, UE 301 receives RRC signaling (e.g., RRCReconfiguration) with RRC configuration information from network 302. The RRC configuration is used to add and activate one or more secondary cells (SCells). The RRC configuration information includes information for SCell addition, SCell activation, and TCI indication. The SCell addition information includes the SCell index, SCell status, and SCell measurement configuration; the SCell activation information includes candidate TCI status information, which includes a list of candidate TCI states to be used for measurement and CSI reporting; and the TCI status information includes a TCI indication, which indicates the selected TCI to be used for measurement and CSI reporting upon activation. In step 313, UE 301 activates the SCell with the corresponding TCI status information. In step 314, UE 301 sends an RRC configuration complete message to network 302. In step 315, UE 301 performs measurements and sends a CSI report for the SCell. In one example, the UE uses the beam indicated by the selected TCI state for CSI-RS measurement and reporting.

[0031] Figure 3 Section 320 also describes the TCI state information for the SCell. The SCell TCI-StateInfo includes TCI state information for the control channel PDCCH and TCI state information for the data channel PDSCH. In one embodiment, the RRC reconfiguration message includes the TCI state information for the SCell to be activated. In one embodiment, the TCI state information includes a TCI state indication for the control channel (PDCCH) of the activated SCell, which includes a control resource set (CORESET) ID and the activated TCI state. In another embodiment, the TCI state information includes a TCI state indication for the data channel (PDSCH) of the activated SCell, which includes a bandwidth part (BWP) ID and a list of activated TCI states.

[0032] In NR, for cases where TCI status is required but has not yet been configured by the network, direct SCell activation at SCell Add / RRC Restore is as follows:

[0033] Ndirect=T RRC_Process +T1+THARQ +T activation_time +T CSI_Reporting

[0034] in,

[0035] -T RRC_Process RRC process delay

[0036] -T1: From time slot n+T RRC_Process Delay until the RRCConnectionReconfigurationComplete message is sent

[0037] -T HARQ Time used to execute Hybrid Automatic Repeat Request (HARQ)

[0038] In the enhanced direct SCell activation process, because the SCell's TCI state information no longer requires MAC CE, the overall SCell activation time is reduced by T. HARQ +3ms.

[0039] Figure 4 The TCI procedure and SCell activation time are illustrated under normal SCell activation, direct SCell activation, and the proposed enhanced direct SCell activation. Under the TCI procedure, the UE first receives the RRC configuration (401) for SCell addition. For example, the RRC configuration includes BWP-Downlink, bwp-Dedicated, PDSCH-config, and tci-StatesToAddModList. For example, tci-StatesToAddModList may include 256 or 128 candidate TCI-stateIds. Next, the UE receives the RRC configuration (402, for the control channel) for SCell activation, and the MAC CE (404, for the data channel) for SCell activation. For example, the MAC CE includes TCI state activation, which may include a subset of 8 TCI-stateIds from the list of candidate TCIs. The actual TCI state indication can be carried by the MAC CE (403, for the control channel) or by the DCI (405, for the data channel).

[0040] Section 420 describes direct SCell activation. First, the UE receives RRC configuration for SCell addition and SCell activation. Next, the UE receives MAC CE indication for SCell activation and TCI indication. After AGC, cell search, and timing tracking, the UE can perform measurements on the SCell and report the SCell's CSI to the network. Section 430 describes enhanced direct SCell activation. First, the UE receives RRC configuration for SCell addition, SCell activation, and TCI indication. After AGC, cell search, and timing tracking, the UE can perform measurements on the SCell and report the SCell's CSI to the network. It should be noted that under direct SCell activation, especially for cases requiring TCI status and where the TCI status has not yet been configured by the network (in FR2), MAC CE for SCell activation or TCI indication is still required. However, under enhanced direct SCell activation, MAC CE for SCell activation and TCI indication is no longer required because the SCell activation and TCI indication are already included in the RRC signaling within the same time slot. The UE can activate the SCell and TCI state based on the TCI state information carried by the received RRC message. As a result, the SCell activation time is reduced under enhanced direct SCell activation. In summary, under the direct SCell activation process, the total time from receiving the RRCReconfiguration signaling to the CSI report is: T RRC_Process +T1+T HARQ +T activation_time +T CSI_Reporting Under the enhanced direct SCell activation process, the overall activation time is reduced by T. HARQ +3ms.

[0041] Figure 5 An implementation of UE operation during NR SCell activation and SCell activation time is illustrated within frequency range 2 (FR2). It should be understood that... Figure 5 The timeline for FR2 is for illustrative purposes only and is not intended to limit the scope of the invention. For example, the invention can also be applied to FR1. Under enhanced direct SCell activation, if the UE receives a TCI state activation command in the same RRC signaling, and if the UE knows the target SCell and uses semi-persistent CSI-RS for CSI reporting, the total time from RRC Reconfiguration signaling to CSI reporting is: T RRC_Process +T1+T activation_time -3ms+T CSI_Reporting .like Figure 5As described, the overall activation time of SCell is reduced by T. HARQ +3ms(B+C), where T HARQ This is the time used to execute Hybrid Automatic Repeat Request (HARQ), such as Figure 5 As shown in the K1+A time interval, 3ms(B+C) refers to... Figure 5 The time periods shown are B (MAC CE processing) and C (RF warm-up margin).

[0042] Figure 6 Another implementation of UE operation under NR SCell activation and SCell activation time is illustrated within frequency range 2 (FR2). It should be understood that... Figure 6 The timeline for FR2 is for illustrative purposes only and is not intended to limit the scope of the invention. For example, the invention can also be applied to FR1. Under enhanced direct SCell activation, if the UE receives a TCI state activation command in the same RRC signaling, and if the UE knows the target SCell and uses periodic CSI-RS for CSI reporting, the total time from RRC Reconfiguration signaling to CSI reporting is: T RRC_Process +T1+max(2ms+T FineTiming +T uncertainty_MAC ,T uncertainty_RRC +T RRC_delay )+T CSI_Reporting .like Figure 6 As described, the overall activation time of SCell is reduced by T. HARQ +3ms(B+C), where T HARQ This is the time used to execute Hybrid Automatic Repeat Request (HARQ), such as Figure 6 As shown in the K1+A time interval, 3ms(B+C) refers to... Figure 6 The time periods shown are B (MAC CE processing) and C (RF warm-up margin).

[0043] Figure 7A flowchart illustrating a method for accelerating SCell activation from the UE's perspective, according to a novel aspect, is provided. In step 701, the UE enters Radio Resource Control (RRC) connection mode in the primary cell of the mobile communication network. In step 702, the UE receives RRC configuration from the network. The RRC configuration includes information for adding a secondary cell (SCell), information for activating the SCell, and a TCI indication for the SCell. In step 703, the UE activates the SCell using the corresponding TCI state indicated by the TCI indication. The SCell activation time is reduced by the time delay from MAC CE operation. In step 704, the UE performs Channel State Information Reference Signal (CSI-RS) measurement and reporting for the activated SCell.

[0044] Figure 8 A flowchart illustrating a method for accelerating SCell activation from the perspective of a novel base station (BS) is provided. In step 801, the gNB establishes a connection with the user equipment (UE) in the primary cell of the mobile communication network. The UE is in Radio Resource Control (RRC) connection mode. In step 802, the gNB sends RRC configuration from the base station. The RRC configuration includes information for adding a secondary cell (SCell), information for activating the SCell, and a TCI indication for the SCell. The SCell is activated using the corresponding TCI state indicated by the TCI indication, and the activation time of the SCell is reduced by the time delay from MAC CE operation. In step 803, the gNB receives the CSI-RS measurement results of the activated SCell from the UE.

[0045] Although the invention has been described in conjunction with certain specific embodiments for illustrative purposes, the invention is not limited thereto. Therefore, various modifications, alterations, and combinations of features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.

Claims

1. A method for activating a secondary cell, the method comprising: The user equipment (UE) enters the Radio Resource Control (RRC) connection mode in the main cell of the mobile communication network. Receive RRC configuration from the mobile communication network, wherein the RRC configuration includes information for adding a secondary cell SCell, information for activating the SCell, and a Transmission Configuration Indicator (TCI) indication for the SCell; The SCell is activated using the corresponding TCI state indicated by the TCI indicator, wherein the activation time of the SCell is reduced by the time delay from the MAC CE operation; and Perform Channel State Information Reference Signal (CSI-RS) measurement and reporting for the activated SCell; The TCI indication includes the BWP ID for the data channel used by the SCell and a list of active TCI states.

2. The method according to claim 1, wherein, The time delay from the MAC CE operation includes the time T used to perform the Hybrid Automatic Repeat Request (HARQ). HARQ Add the time used to process the MAC CE.

3. The method according to claim 1, wherein, The information used to add the SCell includes partial bandwidth BWP configuration information, data channel configuration information, and a list of candidate TCI states for adding the SCell.

4. The method according to claim 1, wherein, The information used to activate the SCell includes a subset of candidate TCI states for SCell activation.

5. The method according to claim 1, wherein, The TCI indication includes the control resource set CORESET ID for the control channel and the active TCI state.

6. The method according to claim 1, wherein, The UE operates in frequency range 2FR2, and the mobile communication network does not provide TCI status prior to the RRC configuration.

7. A secondary cell activated user equipment (UE), the user equipment comprising: A connection processing circuit that establishes a connection in the main cell of the mobile communication network and enters RRC connection mode; A receiver receives RRC configuration from the mobile communication network, wherein the RRC configuration includes information for adding a secondary cell SCell, information for activating the SCell, and a Transmission Configuration Indicator (TCI) indication for the SCell; An SCell processing circuit that activates the SCell using a corresponding TCI state indicated by the TCI indicator, wherein the activation time of the SCell is reduced by the time delay from MAC CE operation; and A transmitter that transmits the Channel State Information Reference Signal (CSI-RS) measurement results of the activated SCell; The TCI indication includes the BWP ID for the data channel used by the SCell and a list of active TCI states.

8. The UE according to claim 7, wherein, The time delay from the MAC CE operation includes the time T used to perform the Hybrid Automatic Repeat Request (HARQ). HARQ Add the time used to process the MAC CE.

9. The UE according to claim 7, wherein, The information used to add the SCell includes partial bandwidth BWP configuration information, data channel configuration information, and a list of candidate TCI states for adding the SCell.

10. The UE according to claim 7, wherein, The information used to activate the SCell includes a subset of candidate TCI states for SCell activation.

11. The UE according to claim 7, wherein, The TCI indication includes the control resource set CORESET ID for the control channel and the active TCI state.

12. The UE according to claim 7, wherein, The UE operates in frequency range 2FR2, and the mobile communication network does not provide TCI status prior to the RRC configuration.

13. A method for activating a secondary cell, the method comprising the following steps: A connection is established with a user equipment (UE) in the main cell of the mobile communication network, wherein the UE is in Radio Resource Control (RRC) connection mode; Sending RRC configuration, wherein the RRC configuration includes information for adding a secondary cell SCell, information for activating the SCell, and a Transmission Configuration Indicator (TCI) indication for the SCell, wherein the SCell is activated using the corresponding TCI state indicated by the TCI indication, and the activation time of the SCell is reduced by the time delay from the MAC CE operation; and The UE receives the Channel State Information Reference Signal (CSI-RS) measurement results of the activated SCell; The TCI indication includes the BWP ID for the data channel used by the SCell and a list of active TCI states.

14. The method according to claim 13, wherein, The time delay from the MAC CE operation includes the time T used to perform the Hybrid Automatic Repeat Request (HARQ). HARQ Add the time used to process the MAC CE.

15. The method according to claim 13, wherein, The information used to add the SCell includes partial bandwidth BWP configuration information, data channel configuration information, and a list of candidate TCI states for adding the SCell.

16. The method according to claim 13, wherein, The information used to activate the SCell includes a subset of candidate TCI states for SCell activation.

17. The method according to claim 13, wherein, The TCI indication includes the control resource set CORESET ID for the control channel and the active TCI state.

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