Wireless communication method and user equipment

Abstract

The present invention provides a user equipment (UE) and a wireless communication method. When the UE operates in an inactive state to receive a multicast service, whether the radio link quality of the UE is lower than or equal to an adjustment threshold is determined, and the adjustment threshold is obtained by adjusting a predetermined threshold according to a predetermined offset. When the radio link quality of the UE is lower than or equal to the adjustment threshold, the UE transitions from an inactive state to a connected state. And receiving the multicast service in the connection state.

Description

Technical Field

[0001] The present invention relates to the field of communication systems, and more particularly to a wireless communication method and user equipment. Background Art

[0002] Wireless communication systems of the third generation (3G) mobile phone standards and technologies are well known. Such 3G standards and technologies were developed by the Third Generation Partnership Project (3GPP). The third generation of wireless communication was developed to support macrocellular mobile phone communications, so that communication systems and networks are moving towards broadband and mobile systems. In a cellular wireless communication system, a user equipment (UE) is connected to a radio access network (RAN) via a radio link. The RAN includes a set of base stations (BS) that provide a radio link with the UE in the cell covered by the base station and an interface to the core network (CN), the former providing a radio link with the UE in the cell covered by the base station and the latter providing overall network control. The RAN and the CN each perform their own functions related to the entire network. The Third Generation Partnership Project developed the Long Term Evolution (LTE) system, the Evolved Universal Mobile Telecommunications System Radio Access Network (E-UTRAN), for mobile access networks, in which one or more macro base stations are supported by base stations called eNodeB or eNB (evolved NodeB). LTE is further developing towards the so-called 5G or NR (New Radio) system, in which one or more cells are supported by base stations called next generation NodeB base stations (gNB). Technical issues

[0003] To enable resource-efficient multicast / broadcast service (MBS) delivery, 3GPP developed NR broadcast / multicast in Rel-17 based on WID in RP-201038, aiming to enable universal MBS services over the 5G system (5GS). Identified use cases that can benefit from this capability include public safety and mission-critical, vehicle-to-everything (V2X) applications, IPTV, real-time video, wireless software delivery, and IoT applications.

[0004] Two delivery models have been agreed for Rel-17 MBS, including: Delivery Mode 1 (for multicast only), capable of handling services with higher Quality of Service (QoS) requirements; and Delivery Mode 2 (broadcast only), focused on services with lower QoS requirements.

[0005] Given that Rel-17 MBS already provides basic functions to support MBS services, the main goal of Rel-18 should be to achieve better deployment of MBS, such as improving resource efficiency and capacity based on Rel-17 MBS.

[0006] Therefore, a wireless communication method is needed to enhance MBS. Technical Solution

[0007] The purpose of the present invention is to provide a user equipment UE, a base station and a wireless communication method.

[0008] In a first aspect, an embodiment of the present invention provides a wireless communication method, which may be executed in a user equipment UE, including: determining whether a radio link quality of the UE is lower than or equal to an adjustment threshold when the UE operates in a deactivated state to receive a multicast service, wherein the adjustment threshold is obtained from a predetermined threshold adjusted with a predetermined offset; When the radio link quality of the UE is lower than or equal to the adjustment threshold, initiating a state transition of the UE from a deactivated state to a connected state; and Receive multicast services in connected state.

[0009] In a second aspect, an embodiment of the present invention provides a user equipment UE, which includes a processor, wherein the processor is configured to call and run a computer program stored in a memory, so that a device equipped with the processor executes the method of the present invention.

[0010] The method of the present invention can be implemented in a chip. The chip may include a processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes the disclosed method.

[0011] The method of the present invention can be programmed as computer-executable instructions stored in a non-transitory computer-readable medium. When the non-transitory computer-readable medium is loaded into a computer, it instructs the processor of the computer to execute the disclosed method.

[0012] The non-transitory computer readable medium may include at least one of the following group: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an EPROM, an electrically erasable programmable read-only memory, and a flash memory.

[0013] The method of the present invention can be programmed as a computer program product to enable a computer to execute the disclosed method.

[0014] The method of the present invention can be programmed as a computer program to enable a computer to execute the disclosed method. Beneficial Effects

[0015] One or more embodiments of the present invention provide a mechanism for transitioning a UE state from a deactivated state to a connected state in order to receive a multicast service. One or more embodiments of the present invention provide a mechanism for configuring and instructing activation and deactivation of HARQ to a UE when the UE receives a multicast service in a deactivated state. Beneficial Effects

[0016] The embodiments of the present invention provide: (1) a method for aligning uplink transmission and downlink reception in XR services, which can improve NR capacity and reduce UE power consumption based on DRX functionality, and (2) A method for RAN-assisted synchronization and alignment between uplink and downlink operations in XR services to coordinate the transmission time of XR traffic at the server and client, and to help the base station gNB reduce the buffer of XR downlink flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A block diagram of a telecommunication system according to an embodiment of the present invention is shown.

[0019] Figure 2 An example of a state transition from a connected state to a deactivated state is shown.

[0020] Figure 3 FIG. 4 is a schematic diagram showing an example of a wireless communication method according to an embodiment of the present invention.

[0021] Figure 4 An example of a state transition from a deactivated state to a connected state is shown.

[0022] Figure 5 A process indicating a hybrid automatic repeat request (HARQ) configuration is shown.

[0023] Figure 6 A schematic diagram of a wireless communication system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0024] The embodiments of the present invention describe technical matters, structural features, implementation purposes and effects in detail with reference to the accompanying drawings. Specifically, the terms in the embodiments of the present invention are only used for the purpose of describing specific embodiments, rather than limiting the disclosure.

[0025] In Rel-17, RAN specifies multicast only for UEs in connected state (i.e., RRC_CONNECTED state), which cannot fully meet the service requirements of mission-critical services, especially for cells with a large number of UEs according to TR 23.774. In addition, it is not energy-efficient because UEs are constantly in connected state. Therefore, it becomes very important to enable UEs to support multicast in deactivated state (i.e., RRC_INACTIVE state).

[0026] To further enhance the NR multicast / broadcast capabilities based on Rel-17 MBS, the goals of Rel-18 include: Specifying UE support for multicast reception in RRC_INACTIVE state; Point-to-multipoint (PTM) configuration for UE to receive multicast in RRC_INACTIVE state Study the impact on mobility and state transitions when UE receives multicast in RRC_INACTIVE state. (Seamless / lossless mobility is not required) Specify Uu signalling enhancements to allow UEs to use shared processing for MBS broadcast and unicast reception, i.e. including the capability and related assistance information reporting of UEs to perform both unicast reception in RRC_CONNECTED state and MBS broadcast reception from the same or different operators simultaneously. Study and, if necessary, specify enhancements to improve resource efficiency of MBS reception in RAN sharing scenarios

[0027] In R17, a UE receiving a multicast service must remain in a connected state (i.e., RRC_CONNECTED state) when receiving an MBS. However, in R18, a UE receiving a multicast service is allowed to remain in a deactivated state (i.e., RRC_INACTIVE state) when receiving an MBS. This means that a UE is allowed to transition from a connected state to a deactivated state, and vice versa, when receiving a multicast service. When and how a UE performs a state transition is an issue that needs to be addressed.

[0028] Reference Figure 1 The telecommunication system includes UE 10a, UE 10b, a base station (BS) 20a and a network entity device 30, and the telecommunication system is used to execute the method disclosed according to the embodiment of the present invention. Figure 1 This is only for illustration and not for limiting the present invention. The telecommunication system may include more UE, BS and CN entities. The connections between devices and device components are based on Figure 11 and 12. The UE 10a may include a processor 11a, a memory 12a, and a transceiver 13a. The UE 10b may include a processor 11b, a memory 12b, and a transceiver 13b. The base station 20a may include a processor 21a, a memory 22a, and a transceiver 23a. The network entity device 30 may include a processor 31, a memory 32, and a transceiver 33. Each processor 11a, 11b, 21a, and 31 may be configured to implement the functions, processes, and / or methods described in the embodiments of the present invention. The radio interface protocol layer may be implemented in the processors 11a, 11b, 21a, and 31. Each memory 12a, 12b, 22a, and 32 may store various programs and information to cooperate with the operation of the connected processor. Each transceiver 13a, 13b, 23a, and 33 works with the connected processor to send and / or receive radio signals or wired signals. The UE 10a may communicate with the UE 10b via a side link. The base station 20a may be an eNB, a gNB, or one of other types of radio nodes, and may configure radio resources for the UE 10a and the UE 10b.

[0029] Each processor 411, 11a, 11b, 21a and 31 may include an application specific integrated circuit (ASIC), other chipsets, logic circuits and / or data processing devices. Each memory 412, 12a, 12b, 22a and 32 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium and / or other storage devices. Each transceiver 413, 13a, 13b, 23a and 33 may include a baseband circuit and a radio frequency (RF) circuit to process radio frequency signals. When the embodiment is implemented by software, the technology described herein may be implemented by modules, processes, functions, entities, etc. that perform the functions described herein. These modules may be stored in a memory and executed by a processor. As is well known in the art, the memory may be integrated inside a processor or implemented outside a processor, and the memory may be communicatively coupled to the processor in various ways.

[0030] The network entity device 30 may be a node in CN. CN may include LTE CN or 5G core network (5GC), including user plane function (UPF), session management function (SMF), 5G core access and mobility management function (AMF), unified data management (UDM), policy control function (PCF), control plane (CP) / user plane (UP) separation (CUPS), authentication server (AUSF), network slice selection function (NSSF) and network exposure function (NEF).

[0031] Reference Figures 2 to 5, the UE examples described in the following embodiments may include one of UE 10a or UE 10b. The base station examples described in the following embodiments may include base station 20a. Please note that even though gNB is used as an example of a base station in the following text, the wireless communication method disclosed in the embodiments of the present invention can be implemented in any other type of base station, such as eNB or a base station other than 5G. Uplink (UL) transmission of control signals or data refers to a transmission operation from a UE to a base station. Downlink (DL) transmission of control signals or data refers to a transmission operation from a base station to a UE. The disclosed method is described in detail below. UE 10 and base station 20 (such as gNB) perform a wireless communication method. In the description, the term network may refer to a core network (CN), a radio access network (RAN), or a combination of CN and RAN. In some cases, the term network may refer to a network entity in a CN or RAN, such as a base station 20a or a network entity device 30. The UE receiving multicast changes from the inactive state to the connected state: For UEs receiving multicast services, state transitions include two types: · Transition from the Connected state to the Deactivated state; and Transition from the Deactivated state to the Connected state.

[0032] For the first type of transition (from connected state to deactivated state), the network can fully configure and control the UE in the connected state. It is up to the network to decide when the UE needs to transition from the connected state to the deactivated state.

[0033] Figure 2 An example of a state transition process is depicted. UE 10 initially operates in a connected state (208) to receive a multicast service (210). Base station 20 provides a measurement configuration and sends it to UE 10, the measurement configuration including a measurement object, a reporting condition, etc. (211). UE 10 performs measurement according to the measurement configuration (212), and transmits a measurement report to base station 20 when the reporting condition is met (214). Base station 20 determines whether to allow UE 10 to enter a deactivated state based on the measurement report (216). When it is determined that UE 10 is allowed to enter the deactivated state, base station 20 sends an RRC release with suspension to UE 10 (217). UE 10 receives the RRC release with suspension, at which time UE 10 performs a transition from the connected state to the deactivated state (218) and receives the multicast service (219).

[0034] For the second type of transition (i.e., from the deactivated state to the connected state), the network cannot configure or control the UE in the deactivated state. Therefore, when the UE needs to transition from the deactivated state to the connected state should be determined by the UE, which means that the UE should autonomously trigger the state transition process.

[0035] Therefore, the following describes in detail when and how a UE receiving multicast performs a transition from a deactivated state to a connected state. The UE receiving multicast changes from the deactivated state to the connected state:

[0036] The radio link conditions and QoS requirements of multicast services are key parameters for UE state transitions. For example, when the radio link quality is poor and the QoS requirements of multicast services are high, it is best for UEs receiving multicast to enter the connected state in the deactivated state, so that the UE can ensure the reliability of communication through the hybrid automatic repeat request (HARQ) scheme.

[0037] During the cell reselection process, the conditions for triggering intra-frequency cell measurement include: rxlev ≤S intrasearchP ) or (S qual ≤S intrasearchQ ). in: S rxlev is the cell selection reception level value (dB); and S rxlev =Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ; S qual is the cell selection quality value (dB); and S qual =Q qyalmeas -(Q qyalmin +Q qualminoffset )-Qoffset temp ; S intrasearchP is the S of the cell measurement within the start frequency rxlev Threshold (related to RSRP); S intrasearchQ is the S of the cell measurement within the start frequency qual Threshold (related to RSRQ); Q rxlevmeas It is the received level value (RSRP) of the measurement cell; Q qualmeas is the quality value of the measured cell (RSRQ); Q rxlevmin is the minimum reception level required in the cell (dBm); Q qualmin is the minimum quality level required in the cell (dB); Q rxlevminoffset It refers to the process of evaluating S in order to periodically search for a higher priority public land mobile network (PLMN) when the UE is normally stationed in a visited public land mobile network (VPLMN). rxlev To add to Q rxlevmin The amount of offset in the signal; Q qualminoffset It refers to the process of evaluating S in order to periodically search for a higher priority public land mobile network (PLMN) when the UE is normally stationed in a visited public land mobile network (VPLMN). qual To add to Q qualmin The offset in the signal; P compensation Yes (P EMAX -P PowerClass )’s maximum value; P EMAX The maximum transmit power level (dBm) that a UE (e.g., UE 10) in a cell can use for uplink transmission as defined in TS 38.101; P PowerClass is the maximum radio frequency (RF) output power (dBm) of a UE (e.g., UE 10) according to the UE power classes defined in TS 38.101; Qoffset temp It is the offset temporarily used for the cell.

[0038] The function max() is the maximum value of the backhaul input. RSRP stands for reference signal received power, RSRQ stands for reference signal received quality. PLMN stands for public land mobile network, and VPLMN stands for visited public land mobile network.

[0039] During the cell reselection process: ●S rxlev and S qual To evaluate the signal strength and quality detected by the UE; and ·S intrasearchP and S intrasearchQ Threshold used to trigger intra-frequency cell measurement.

[0040] When (S rxlev≤S intrasearchP ) or (S qual ≤S intrasearchQ ), the UE (e.g., UE 10) shall start the measurement of the same-frequency neighboring cells and sort the serving cell and the same-frequency neighboring cells. The UE shall select the best cell to camp on according to the condition S.

[0041] It can be inferred that in (S rxlev ≤S intrasearchP ) or (S qual ≤S intrasearchQ ), the radio link condition is bad enough to at least trigger a cell measurement or cell reselection procedure. In the embodiment of the present invention, when determining whether to trigger a state transition procedure, S is reused. rxlev and S qual parameters to assess radio link conditions.

[0042] Reference Figure 3 When UE 10 receives a multicast service in an inactive state, UE 10 determines whether a radio link quality of UE 10 is lower than or equal to an adjustment threshold (S001), wherein the adjustment threshold is obtained by adjusting a predetermined threshold according to a predetermined offset.

[0043] When the radio link quality of UE 10 is lower than or equal to the adjustment threshold, UE 10 initiates a state transition from the inactive state to the connected state (S003). The inactive state refers to an inactive state of radio resource control (RRC), and the connected state refers to an RRC connected state. UE 10 receives the multicast service in a connected state (S005).

[0044] In one embodiment, the radio link quality of the UE is determined by the received signal level value S rxlev Indicates that the predetermined threshold is the threshold S for starting the same-frequency cell measurement rxlev , and the predetermined offset is an offset applied to the predetermined threshold. S rxlev =Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ; in: Q rxlevmeas is the measured cell reception level value; Q rxlevmin is the minimum reception level required by the cell; Q rxlevminoffset Is to be added to Q rxlevmin The offset of P compensationis max(P EMAX -P PowerClass ); P EMAX is the maximum uplink transmit power level of the UE in the cell; P PowerClass is the maximum radio frequency (RF) output power of the UE according to the UE power class of the UE; and Qoffset temp An offset temporarily used for a cell.

[0045] In one embodiment, the predetermined threshold is a threshold S intrasearchP And the predetermined offset is the offset S OffsetP , when (S intrasearchP rxlev ≤S intrasearchP +S OffsetP ) or (S intrasearchQ qual ≤S intrasearchQ +S OffsetQ ), the UE initiates a state transition from the inactive state to the connected state.

[0046] In one embodiment, the UE obtains the threshold S in the system information block (SIB). intrasearchP , offset S OffsetP , Q rxlevmeas , Q rxlevmin , Q rxlevminoffset , P compensation , P EMAX and Qoffset temp And other parameters.

[0047] In one embodiment, the radio link quality of the UE is determined by the cell selection quality value S qual Indicates that the predetermined threshold is the threshold S for starting the same-frequency cell measurement qual , the predetermined offset is an offset applied to the predetermined threshold. S qual =Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp ; in: Q qualmeas is the measured cell quality level; Q qualmin is the minimum required quality level required by the cell; Q qualminoffset Is to be added to Q qualmin The offset of ​​P EMAX is the maximum uplink transmit power level of the UE in the cell; P PowerClass is the maximum radio frequency (RF) output power of the UE according to the UE power class of the UE; and Qoffset temp An offset temporarily used for a cell.

[0048] In one embodiment, the predetermined threshold is a threshold S intrasearchQ , the predetermined offset is the offset S OffsetQ , when (S intrasearchQ qual ≤S intrasearchQ +S OffsetQ ), the UE initiates a state transition from the inactive state to the connected state. In one embodiment, the UE obtains the threshold S in the system information block (SIB). intrasearchQ , offset S OffsetQ , Q qualmeas , Q qualmin , Q qualminoffset , P compensation 、p EMAX and Qoffset temp And other parameters. Conditions and state transition process of a UE receiving multicast from an inactive state to a connected state:

[0049] For the state transition process, the threshold of the state transition process should be greater than S intrasearvhP and S intrasearchQ . Since UE10 is in (S rxlev ≤S intrasearchP ) or (S qual ≤S intrasearchQ ), a cell selection or reselection procedure is performed, and multicast services are not allowed to be received in the serving cell. Therefore, at least one offset can be introduced to trigger the state transition. The condition for triggering the state transition can be: (S intrasearchP rxlev ≤S intrasearchP +S OffsetP ) or (S intrasearchQ qual ≤S intrasearchQ +S offsetQ );

[0050] in: S rxlev , S qual , S intrasearchP , S intrasearchQ ​​​The definitions and values ​​of parameters such as are the same as those in the cell selection / reselection process; S OffsetP is to be added to S intrasearchP The introduction offset of S OffsetQ is to be added to S intrasearchQ The introduced offset.

[0051] Figure 4 An example of a state transition process is shown. UE 10 initially operates in an inactive state (308) to receive a multicast service (310). Base station 20 may provide and send measurement configuration and state transition conditions through downlink control signaling. For example, in this embodiment, base station 20 provides measurement configuration and state transition conditions to UE 10 through a system information block (SIB) (312), wherein the system information block provides Q rxlevmin , Q rxlevminoffset , Q qualmin , Q qualminoffset , P EMAX 、Qoffset temp , S intrasearchP , S intrasearchQ , S OffsetP and S OffsetQ In particular, S OffsetP is a new definition and is introduced into S intrasearchP The offset, S OffsetQ is a new definition and is introduced into S intrasearchQ The offset of

[0052] The UE 10 performs measurement according to the measurement configuration, and transmits a measurement report to the base station 20 when a reporting condition is satisfied (314).

[0053] When ((S intrasearchP rxlev ≤S intrasearchP +S OffsetP ) or (S intrasearchQ qual ≤S intrasearchQ +S OffsetQ ), UE 10 starts the state transition process from the inactive state to the connected state. rxlev ≤S intrasearchP ) or (S qual ≤S intrasearchQ ), UE 10 starts the traditional cell reselection procedure.

[0054] ​​When the state transition condition is met, UE 10 initiates a state transition process from the inactive state to the connected state (316), and transmits an RRC resume request or an RRC resume request 1 to base station 20 (318).

[0055] After receiving the RRC resume request or RRC resume request 1, the base station 20 determines the request for UE 10 to transition to the connected state, and sends an RRC resume message to UE 10 in response to the RRC resume request or RRC resume request 1 (320). After receiving the RRC resume message (324), UE 10 performs a state transition from the deactivated state to the connected state and receives multicast services. After transitioning to the connected state, UE 10 sends an RRC resume complete message (322) to the base station 20. The base station 20 receives the RRC resume complete message. Multicast services received by UE 10 in the connected state (326). Enabling and deactivating HARQ during state transition:

[0056] Hybrid Automatic Repeat Request (HARQ) is applicable to UE 10 receiving multicast services in connected state and can be enabled and disabled. When operating in deactivated state, the UE 10 should be instructed whether to enable or disable HARQ.

[0057] The HARQ enabling indication may be transmitted in the RRC release message. For example, the HARQ enabling indication may be represented by a field, an information element (IE) or a parameter.

[0058] Reference Figure 5 , the UE 10 initially receives the multicast service (310) in the deactivated state (408). The UE 10 receives the multicast service (410) in the connected state.

[0059] The base station 20 determines whether to allow the UE 10 to enter the deactivated state according to the measurement report (412). When it is determined that the UE 10 is allowed to enter the deactivated state, the base station 20 sends an RRC release message for coordination suspension to the UE 10 (414). The base station 20 may send an indication of HARQ activation or HARQ deactivation to the UE 10. The HARQ activation or HARQ deactivation indication may be a message separate from the RRC release message for coordination suspension, or may be integrated into the RRC release message for coordination suspension. The UE 10 receives the RRC release message for coordination suspension and the HARQ activation or HARQ deactivation indication.

[0060] UE 10 performs a state transition from a connected state to a deactivated state in response to an RRC release message (416) in coordination with the suspension, and receives a multicast service in the deactivated state (418). In addition, when a HARQ enabling indication is received, UE 10 in the deactivated state enables performing a HARQ process when receiving the multicast service (420). Option 1:

[0061] If there is no HARQ enabling indication in the RRC release message coordinated with the suspension, the RRC release message instructs the UE 10 to deactivate HARQ when receiving multicast in the deactivated state.

[0062] If there is a HARQ enabling indication in the RRC release message coordinated with the suspension, the RRC release message instructs the UE 10 to enable HARQ when receiving multicast in the deactivated state.

[0063] UE 10 receives an RRC release message with coordination suspension, and when there is a HARQ enabling indication in the RRC release message with coordination suspension, UE 10 enables HARQ when receiving a multicast service associated with UE 10, and when there is no HARQ enabling indication in the RRC release message with coordination suspension, UE 10 deactivates HARQ when receiving a multicast service associated with UE 10.

[0064] When the UE 10 determines that HARQ is enabled when receiving the associated multicast service in the deactivated state, the UE 10 performs the HARQ process for the multicast service reception.

[0065] When UE 10 enables HARQ, UE 10 sends HARQ feedback to base station 20 based on whether UE 10 successfully receives the multicast service. HARQ feedback may include an acknowledgement (ACK) or a negative acknowledgement (NACK). UE 10 may send HARQ ACK to base station 20 in response to successful reception of the multicast service, or send HARQ NACK to base station 20 in response to unsuccessful reception of the multicast service. Option 2:

[0066] If it is necessary to explicitly indicate whether HARQ is enabled or not, the network may explicitly transmit an indication to the UE 10 indicating HARQ enablement or HARQ deactivation.

[0067] When the UE 10 receives the HARQ enabling indication, the UE 10 enables HARQ when receiving the multicast service associated with the UE 10 ; when the UE 10 receives the HARQ disabling indication, the UE 10 disables HARQ when receiving the multicast service associated with the UE 10 .

[0068] When the UE 10 determines that HARQ is enabled when receiving the associated multicast service in the deactivated state, the UE 10 performs the HARQ process for the multicast service reception.

[0069] When UE 10 turns on HARQ, UE 10 sends HARQ feedback to base station 20 based on whether UE 10 successfully receives the multicast service. HARQ feedback may include an acknowledgement (ACK) or a negative acknowledgement (NACK). UE 10 may send HARQ ACK to base station 20 in response to successful reception of the multicast service, or send HARQ NACK to base station 20 in response to unsuccessful reception of the multicast service.

[0070] Multicast services require higher QoS than broadcast services. It should be noted that although multicast services are illustrated in the embodiments, the contents disclosed in the embodiments of the present invention may also be applicable to broadcast service reception or MBS reception.

[0071] Figure 6 7 is a block diagram of an example system 700 for wireless communications according to an embodiment of the present invention. The embodiments described herein may be implemented into a system using any suitably configured hardware and / or software. Figure 6 The illustrated system 700 includes a radio frequency (RF) circuit 710, a baseband circuit 720, a processing unit 730, a memory / storage 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other.

[0072] Processing unit 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor and an application processor. The processor may be coupled to a memory / storage and configured to execute instructions in the memory / storage to enable various applications and / or operating systems running on the system.

[0073] Radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuit may provide communications compatible with one or more radio technologies. For example, in some embodiments, the baseband circuit may support communications with 5G NR, LTE, Evolved Universal Terrestrial Radio Access Network (EUTRAN) and / or other wireless metropolitan area networks (WMAN), wireless local area networks (WLAN), and wireless personal area networks (WPAN). An embodiment in which the baseband circuit is configured to support radio communications of multiple wireless protocols may be referred to as a multi-mode baseband circuit. In various embodiments, the baseband circuit 720 may include circuits for operating signals that are not strictly considered to be in the baseband frequency. For example, in some embodiments, the baseband circuit may include circuits for operating signals with an intermediate frequency, which is between the baseband frequency and the radio frequency.

[0074] In various embodiments, system 700 may be a mobile computing device, such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smart phone, etc. In various embodiments, the system may have more or fewer components, and / or different architectures. Where appropriate, the methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

[0075] Embodiments of the present invention are a combination of techniques / processes that may be adopted in 3GPP specifications to create a final product.

[0076] If the software functional unit is implemented and used and sold as a product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution proposed in the present invention can be implemented basically or partially in the form of a software product. Alternatively, part of the technical plan is beneficial to conventional technology and can be implemented in the form of a software product. The software product is stored in a storage medium in a computer, including multiple commands for a computing device (such as a personal computer, a server, or a network device) to run all or part of the steps disclosed in the embodiment of the present invention. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other medium capable of storing program code.

[0077] One or more embodiments of the present invention provide a mechanism for converting a UE state from an inactive state to a connected state in order to receive a multicast service.

[0078] One or more embodiments of the present invention provide a mechanism for configuring and instructing UE to activate and deactivate HARQ when the UE receives a multicast service in an inactive state.

[0079] While the present invention has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment but is intended to cover various arrangements made without departing from the broadest interpretation of the appended claims.

Claims

1. A wireless communication method, which may be performed in a user equipment UE, comprising: When the UE operates in an inactive state to receive a multicast service, determining whether a radio link quality of the UE is lower than or equal to an adjustment threshold, wherein the adjustment threshold is obtained by adjusting a predetermined threshold according to a predetermined offset; When the radio link quality of the UE is lower than or equal to the adjustment threshold, the UE transitions from an inactive state to a connected state; and The multicast service is received in the connection state.

2. The method according to claim 1, characterized in that The inactive state is a radio resource control (RRC) inactive state, and the connected state is an RRC connected state.

3. The method according to claim 1, characterized in that The radio link quality of the UE is determined by the received signal level value S rxlev Indicates that the predetermined threshold is the threshold S used to start the same-frequency cell measurement rxlev , the predetermined offset is an offset applied to the predetermined threshold.

4. The method according to claim 3, characterized in that: S rxlev =Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ,in, Q qualmeas is the quality value of the measurement cell; Q rxlevmin is the minimum reception level required in the cell; Q rxlevminoffset Is to be added to Q rxlevmin The amount of offset in the signal; P compensation Yes (P EMAX -P PowerClass )’s maximum value; P EMAX It is the maximum transmit power level that a UE in the cell can use when transmitting in the uplink; P PowerClass is the maximum RF output power of the UE according to the UE power class; and Qoffset temp It is the offset temporarily used for the cell.

5. The method according to claim 4, characterized in that The predetermined threshold is the threshold S intrasearchP , the predetermined offset is the offset S OffsetP , and when (S intrasearchP <S rxlev ≤S intrasearchP +S OffsetP ) or (s intrasearchQ <S qual ≤S intrasearchQ +S OffsetQ ), the UE initiates a state transition from an inactive state to a connected state.

6. The method according to claim 5, characterized in that The UE receives the threshold S in the system information block SIB. intrasearchP , the offset S OffsetP , Q rxlevmeas , Q rxlevmin , Q rxlevminoffset , P compensation , P EMAX and Qoffset temp .

7. The method according to claim 1, characterized in that The UE's radio link quality is determined by the cell selection quality value S qual Indicates that the predetermined threshold is the threshold S used to start the intra-frequency cell measurement qual , the predetermined offset is an offset applied to the predetermined threshold.

8. The method according to claim 7, characterized in that S qual =Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp ,in: Q rxlevmeas is the measured cell reception level value; Q rxlevmin is the minimum reception level required by the cell; Q rxlevminoffset Is to be added to Q rxlevmin The offset of P EMAX is the maximum uplink transmit power level of the UE in the cell; P PowerClass is the maximum radio frequency output power of the UE obtained according to the UE power class of the UE; and Qoffset temp An offset temporarily used for a cell.

9. The method according to claim 8, characterized in that The predetermined threshold is the threshold S intrasearchQ , the predetermined offset is the offset S offsetQ , when (S intrasearchQ <S qual ≤S intrasearchQ +S OffsetQ ), the UE initiates a state transition from an inactive state to a connected state.

10. The method according to claim 9, characterized in that The UE receives the threshold S in the system information block SIB. intrasearchQ , offset S OffsetQ , Q qualmeas , Q qualmin , Q qualminoffset , P compensation , P EMAX and Qoffset temp .

11. The method according to claim 1, further comprising: Receiving an RRC release message for coordination suspension; When there is a hybrid automatic repeat request HARQ enabling indication in the RRC release message coordinated with the suspension, determining to enable HARQ when receiving a multicast service associated with the UE; When there is no HARQ activation indication in the RRC release message coordinated with the suspension, determining to deactivate HARQ when receiving a multicast service associated with the UE; and When the UE in the inactive state enables HARQ when receiving a multicast service associated with the UE, a HARQ process is performed for multicast service reception.

12. The method according to claim 1, further comprising: Receive instructions; When the indication indicates that HARQ is enabled, determining to enable HARQ when receiving a multicast service associated with the UE; and When the indication indicates that HARQ is deactivated, determining to deactivate HARQ when receiving a multicast service associated with the UE; and When HARQ is enabled for the multicast service reception associated with the UE in the inactive state, a HARQ process is performed for the multicast service reception.

13. A user equipment UE, comprising: A processor, configured to call and run a computer program stored in a memory so that a device equipped with the processor executes the method according to any one of claims 1 to 12.

14. A chip, comprising: A processor, configured to call and run a computer program stored in a memory so that a device equipped with the chip executes a method according to any one of claims 1 to 12.

15. A computer-readable storage medium having a computer program stored therein, wherein: The computer program causes a computer to execute the method according to any one of claims 1 to 12.

16. A computer program product comprising a computer program, wherein: The computer program causes a computer to execute the method according to any one of claims 1 to 12.

17. A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 12.

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