Multicast transmission method and device for switching enhancement thereof

Abstract

A multicast transmission method for handover enhancement includes generating a group-based Radio Network Temporary Identifier (G-RNTI) for multicast transmission / reception during handover, where the G-RNTI is generated by a User Equipment (UE) and a network, respectively, or by the network or the UE. The multicast transmission equipment for switching enhancement comprises the UE and / or the network for executing the method.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication systems, such as non-terrestrial network (NTN) systems, and particularly to a multicast transmission method and apparatus for handover enhancement, such as NTN-NTN handover. Background Art

[0002] Current work considers using existing methods of the new radio (NR) terrestrial network (TN) and the results of the Rel-17 NR NTN work item (WI) as a baseline for NTN-TN mobility. The mobility-related objectives of this work item include standardizing measurements / mobility and service continuity enhancements for NTN-TN and NTN-NTN, and further standardizing NTN-NTN handover enhancements for radio resource control_connected state (RRC_CONNECTED) user equipment (UE) in quasi-geostationary cells and terrestrial mobile cells to reduce signaling overhead.

[0003] In non-geosynchronous orbit (NGSO) scenarios, satellites (especially low earth orbit (LEO) satellites) are characterized by high-speed movement. In some scenarios, the relative speed of LEO satellites with respect to the earth can be as high as 7.56 kilometers per second (i.e., 27216 kilometers / hour), which is 100 times that of a high-speed train. Whether the UE is moving or stationary, this means that in the LEO scenario, almost all UEs in the same cell may frequently perform handovers within a very short period of time. If existing handover commands are used, it may result in a large amount of signaling overhead, especially these signals may be generated in batches because handover commands are now transmitted in the form of dedicated RRC signaling (i.e., RRC reconfiguration messages).

[0004] Signaling bursts pose challenges to the network because the network may not have enough radio resources to transmit handover commands for each relevant UE within a short period of time. Therefore, handover commands for some UEs may arrive later than those for other UEs, which may lead to late handovers or even handover failures. Therefore, reducing the signaling load of handover (HO) commands is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the present disclosure is to propose a multicast transmission method and apparatus for handover enhancement, which can reduce the signaling load in handover procedures (such as NTN-NTN handover procedures).

[0006] In a first aspect of the present disclosure, a multicast transmission method for handover enhancement includes generating a group-based radio network temporary identifier (G-RNTI) for multicast transmission / reception during handover, and the G-RNTI is generated by the UE and the network itself, or generated by the network or the UE.

[0007] In a second aspect of the present disclosure, the handover enhanced multicast transmission apparatus includes a UE and / or a network configured to execute the above method.

[0008] In a third aspect of the present disclosure, instructions are stored on a non-volatile readable storage medium, and when a computer executes these instructions, the computer is caused to execute the above method.

[0009] In a fourth aspect of the present disclosure, a chip includes a processor for calling and running a computer program stored in a memory, such that a device installed with the chip executes the above method.

[0010] In a fifth aspect of the present disclosure, a computer program is stored in a computer-readable storage medium, such that a computer executes the above method.

[0011] In a sixth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.

[0012] In a seventh aspect of the present disclosure, a computer program causes a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] For a clearer illustration of the embodiments of the present disclosure or related technologies, the following drawings will be briefly introduced. Apparently, these drawings are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without additional prerequisites.

[0014] Figure 1 is a block diagram between multiple user equipments (UEs) provided by an embodiment of the present disclosure and a network (e.g., gNB) in a communication network system.

[0015] Figure 2 is a flowchart of a method for handover enhanced multicast transmission provided by an embodiment of the present disclosure.

[0016] Figure 3 is a schematic diagram of a sub-region index / ID provided by an embodiment of the present disclosure.

[0017] Figure 4 is a schematic diagram of a sub-region index / ID provided by an embodiment of the present disclosure.

[0018] Figure 5 is a schematic diagram of a sub-region index / ID provided by an embodiment of the present disclosure.

[0019] Figure 6 is a schematic diagram of a sub-region index / ID provided by an embodiment of the present disclosure.

[0020] Figure 7 is a schematic diagram of a mapping relationship between parameters and G-RNTI provided by an embodiment of the present disclosure.

[0021] Figure 8 It is a schematic diagram of the mapping relationship between parameters and G-RNTI provided by an embodiment of the present disclosure.

[0022] Figure 9 It is a multicast transmission flow chart of the first type of NTN-NTN handover provided by an embodiment of the present disclosure.

[0023] Figure 10 It is a schematic diagram of the first sub-region index / ID and its mapping table provided by an embodiment of the present disclosure.

[0024] Figure 11 It is a multicast transmission flow chart of the second type of NTN-NTN handover provided by an embodiment of the present disclosure.

[0025] Figure 12 It is a schematic diagram of the relationship between the second sub-region index / ID and G-RNTI provided by an embodiment of the present disclosure.

[0026] Figure 13 It is a multicast transmission flow chart of the third type of NTN-NTN handover provided by an embodiment of the present disclosure.

[0027] Figure 14 It is a multicast transmission flow chart of the fourth type of NTN-NTN handover provided by an embodiment of the present disclosure.

[0028] Figure 15 It is a multicast transmission flow chart of the fifth type of NTN-NTN handover provided by an embodiment of the present disclosure.

[0029] Figure 16 It is a block diagram of a wireless communication system provided by an embodiment of the present disclosure. Detailed implementation manners

[0030] Embodiments of the present disclosure describe in detail technical problems, structural features, implementation objectives and effects below, and are accompanied by relevant diagrams. Specifically, the terms in the embodiments of the present disclosure are only used for the purpose of describing specific embodiments, and do not limit the present disclosure.

[0031] In some embodiments of the present disclosure, broadcast or multicast signaling can be used for the NTN handover procedure. In the case of using multicast signaling, how to derive the G-RNTI and how the UE obtains the G-RNTI are problems that need to be solved.

[0032] A network refers to a node in an NTN system, including one of the following nodes, for example: 1. Spaceborne carriers (such as satellites), airborne carriers, aerial vehicles (such as drones), etc.; 2. Base stations; 3. Gateways; 4. Core networks. The NTN system includes nodes such as satellites, gateways, base stations, and core networks. The network in some embodiments of the present disclosure refers to any node in the NTN system. "Satellites" can be classified into multiple types, including spaceborne carriers (such as satellites), airborne carriers, aerial vehicles (such as drones), etc.

[0033] Figure 1 One or more user equipment (UEs) 10 and a network (e.g., gNB) 20 for communicating in the communication network system 40 of an embodiment of the present disclosure are shown. The communication network system 40 includes one or more UEs 10 and a network 20. One or more UEs 10 may include a processor 11 connected to a memory 12 and a transceiver 13. The network 20 may include a processor 21 connected to a memory 22 and a transceiver 23. The processor 11 or 21 may be configured to implement the functions, programs, and / or methods presented in this description. Layers of the radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is effectively connected to the processor 11 or 21 and stores various information to operate the processor 11 or 21. The transceiver 13 or 23 is effectively connected to the processor 11 or 21, and the transceiver 13 or 23 is used to transmit and / or receive wireless signals.

[0034] The processor 11 or 21 may include an application-specific integrated circuit (ASIC), other chip sets, logic circuits, and / or data processing devices. The memory 12 or 22 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. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When an embodiment is implemented in software form, the technology described in the present disclosure may be implemented by modules (e.g., procedures, functions, etc.) that execute the functions described herein. The modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be integrated within the processor 11 or 21, or located outside the processor 11 or 21 and communicate with the processor 11 or 21 through various known means. Additionally, in some embodiments, the processor 11 is configured to execute the following method. In some embodiments, the processor 21 is configured to execute the following method.

[0035] Figure 2It is a flowchart of a handover-enhanced multicast transmission method 200 provided by an embodiment of the present disclosure. In some embodiments, the multicast transmission method 200 includes: Step 202, generating a group-based radio network temporary identifier (G-RNTI) for multicast transmission / reception during a handover (HO) process, where the G-RNTI is generated by the UE and the network respectively, or generated by the network or the UE. This can reduce the signaling load during the handover process, such as during the NTN-NTN handover process.

[0036] In some embodiments, the G-RNTI is generated by the network and transmitted from the network to the UE via broadcast and / or multicast and / or unicast signaling. In some embodiments, if the G-RNTI is generated by one node, the G-RNTI is transmitted from the node that generates the G-RNTI to another node. In some embodiments, if the G-RNTI is generated by two nodes, the G-RNTI generation rules or generation parameters of the two nodes are the same. In some embodiments, the handover-enhanced multicast transmission method further includes: generating the G-RNTI using at least one parameter and / or G-RNTI derivation rule. In some embodiments, the at least one parameter includes reference signal received power (RSRP), reference signal received quality (RSPQ), the distance between the UE and a reference location, the time measured by the UE, the public land mobile network (PLMN), the UE location, the sub-region index / ID, the time slot information of the region / sub-region, the orthogonal frequency division multiplexing (OFDM) information of the region / sub-region, and / or frequency information.

[0037] In some embodiments, the sub-region index / ID is static and permanent, semi-static, or dynamic. In some embodiments, the sub-region index / ID is allocated in a one-dimensional format or a two-dimensional / multi-dimensional format. In some embodiments, the sub-region index / ID is global or regional. In some embodiments, the G-RNTI derivation rule includes a mapping rule or a function rule. In some embodiments, the mapping rule defines the mapping relationship between at least one parameter and the G-RNTI, and the mapping relationship includes a many-to-one mapping or a one-to-one mapping. In some embodiments, the function rule defines the functional relationship between at least one parameter and the G-RNTI. In some embodiments, the at least one parameter and / or G-RNTI derivation rule are maintained by the UE and the network respectively, or the at least one parameter and / or G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE.

[0038] In some embodiments, at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, the G-RNTI derivation rule is a mapping rule, and the G-RNTI is generated by the UE and the network respectively. In some embodiments, at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, the G-RNTI derivation rule is a function rule, and the G-RNTI is generated by the UE and the network respectively. In some embodiments, at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE, the G-RNTI derivation rule is a mapping rule, and the G-RNTI is generated by the UE and the network respectively. In some embodiments, at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE, the G-RNTI derivation rule is a function rule, and the G-RNTI is generated by the UE and the network respectively.

[0039] In some embodiments, the G-RNTI is generated by the UE. In some embodiments, the G-RNTI is generated by the UE and transmitted from the UE to the network. In some examples, the UE is configured to generate the G-RNTI using at least one parameter and / or the G-RNTI derivation rule. Other examples are similar to the above embodiments, that is, generating the G-RNTI also requires parameters and / or rules. The parameters and / or rules may be owned / derived / known / maintained by the UE itself, or may need to be sent to the UE by the network. In some examples, at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, or at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE.

[0040] In some embodiments, at least one parameter includes RSRP, RSPQ, the distance between the UE and a reference location, the time when the UE measures, the PLMN, the UE location, the sub-region index / ID, the time slot information of the region / sub-region, the OFDM information of the region / sub-region, and / or the frequency information. In some embodiments, the sub-region index / ID is static and permanent, semi-static, or dynamic. In some embodiments, the sub-region index / ID is assigned in a one-dimensional format or a two-dimensional / multi-dimensional format. In some embodiments, the sub-region index / ID is global or regional. In some embodiments, the G-RNTI derivation rule includes a mapping rule or a function rule. In some embodiments, the mapping rule defines the mapping relationship between at least one parameter and the G-RNTI, and the mapping relationship can be a many-to-one mapping or a one-to-one mapping. In some embodiments, the function rule defines the functional relationship between at least one parameter and the G-RNTI. In some embodiments, at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, or at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE.

[0041] G-RNTI Derivation

[0042] This problem involves who can determine the G-RNTI. Two ways are considered. One way is that the network (NW) is responsible for generating the G-RNTI for each group (in this disclosure, we refer to "generating" as "allocating / calculating / maintaining or otherwise deriving the G-RNTI"), and sending the G-RNTI to the UEs belonging to each group. In this way, the NW can first group the UEs in the NTN cell, generate the G-RNTI for each group, and then send the G-RNTI to the UEs (in this disclosure, we call this way "NW generation").

[0043] Another way is that both the UE and the NW can generate the G-RNTI by themselves, and the NW does not need to send the G-RNTI. In this way, the NW can directly send signaling to the UEs belonging to the same group and using the same G-RNTI. The UE can monitor the G-RNTI, C-RNTI, and other RNTIs that need to be monitored due to other procedures. The UE can receive multicast signaling / data (in this disclosure, we call this way "local generation").

[0044] G-RNTI Derivation Parameters

[0045] At least one parameter for G-RNTI derivation includes RSRP, RSPQ, the distance between the UE and the reference position, the time measured by the UE, PLMN, UE location, sub-region index / ID, time slot information of the region / sub-region, OFDM information of the region / sub-region, frequency information, and / or some other parameters.

[0046] In some embodiments, a new parameter is defined, called the sub-region index / ID. The NTN cell / coverage area is divided into multiple sub-regions, and each sub-region is assigned an index. This index may have the following three cases. The first case is that the index can be static and permanent. For example, the Earth's surface can be divided into multiple sub-regions according to countries, land attributes (such as deserts, ocean areas, or forests, etc.), so that the index of each sub-region can be static and permanent. The second case is that the index can be semi-static, which means that the index remains unchanged for a relatively long time, but can be changed by the network. For example, a certain area is initially covered by one satellite, so it is divided into one sub-region and assigned an index. However, later if the area is covered by five satellites, it may be necessary to divide it into more sub-regions to provide more accurate geographical information. The third case is that the division of the sub-regions and the assignment of the index can be dynamically changed by the network. In some of the above embodiments, the sub-region index / ID can be static and permanent, semi-static, or dynamic.

[0047] In some embodiments, the sub-region index / ID is assigned in a one-dimensional format, i.e., single-layer: each sub-region has a unique index. Figure 3 In the example, the regions of three countries are divided into 8 sub-regions, and each region has a unique index in one-dimensional format.

[0048] In some embodiments, the sub-region index / ID is assigned in a two-dimensional / multi-dimensional format, i.e., double-layer / multi-layer: the index can be in a two-dimensional / multi-dimensional format. Figure 4 In the example, the regions of three countries are divided into 8 sub-regions, and each region has a unique index in two-dimensional format, which can be represented as a vector. The first value of the vector can represent country information, and the second value can represent the ID within that country.

[0049] In some embodiments, the sub-region index / ID is global or regional. Figure 5 In the example, all indexes are globally unique. Figure 6 In the example, the indexes can be reused between different sub-regions, such as in the regions of Country 1 and Country 3 in this example.

[0050] G-RNTI Derivation Rules

[0051] In some embodiments, the G-RNTI derivation rules include mapping rules or function rules. In some embodiments, the mapping rule defines the mapping relationship between at least one parameter and G-RNTI, and this mapping relationship includes many-to-one mapping or one-to-one mapping. Specifically, in some examples, the parameter and the rule can form a mapping relationship, which can be N-to-one mapping or one-to-one mapping (in some embodiments of the present disclosure, we refer to this rule as the "mapping rule"). In addition, the parameter can be one or any combination of parameter sets. The relationship can be represented in tabular format, such as Figure 7 (Example of one-to-one mapping) and Figure 8 (Example of many-to-one mapping), or any other type of format, to indicate the relationship between the parameter and G-RNTI.

[0052] In some embodiments, the function rule defines the functional relationship between at least one parameter and G-RNTI. Specifically, in some examples, G-RNTI can be calculated by a function, and the variables of this function are parameters. The format is as follows (in some embodiments of the present disclosure, we refer to this rule as the "function rule").

[0053] G-RNTI = function(parameter1)

[0054] G-RNTI = function(parameter1, parameter2,..., parameterM)

[0055] The rules can be static and permanent, or modified or configured by the network and transmitted to the UEs in the NTN cell upon modification / updating. The transmission method can be broadcast, such as system information.

[0056] Parameter and rule maintenance

[0057] In some embodiments, at least one parameter and / or G-RNTI-derived rule is maintained by the UE and the NW respectively, or at least one parameter and / or G-RNTI-derived rule is passed from the UE to the NW and / or from the NW to the UE.

[0058] Specifically, in some examples, the first option is that these parameters and rules can be jointly maintained by the UE and the NW without transferring any parameters or rules from the NW to the UE or vice versa. Both the UE and the NW can generate the G-RNTI based on the parameters and rules (in some embodiments of the present disclosure, we refer to this method as "local maintenance").

[0059] In some examples, the second option is that the NW or the UE is not aware of one or more parameters or rules and instead receives them from the other party (in some embodiments of the present disclosure, we refer to this method as "network transfer"). For example, when the NW maintains all parameters and rules and the UE does not maintain any or some of them, the NW passes the parameters or rules to the UE, and vice versa. When the UE maintains all parameters and rules and the NW does not maintain any or some of them, the UE passes the parameters or rules to the NW. The transfer from the NW to the UE can be in a broadcast manner, such as system information.

[0060] Embodiment 1: "Local maintenance", "mapping rule", and "local generation"

[0061] In some embodiments, at least one parameter and / or G-RNTI-derived rule is maintained by the UE and the NW respectively, the G-RNTI-derived rule is a mapping rule, and the G-RNTI is generated by the UE and the NW respectively.

[0062] Figure 9 Shows that in some examples, the multicast transmission of NTN-NTN handover includes the following steps:

[0063] Step 0: The UE and the source cell may perform measurement control and reporting. Step 1: The source cell may make a HO decision. Step 2: The source cell sends the scrambled group common handover signaling to the UEs belonging to the same group via the G-RNTI, and the UEs may receive the signaling by monitoring the G-RNTI. Step 3: The source cell sends UE-specific handover signaling to the UE via dedicated signaling. In addition, regarding the UE's monitoring of the G-RNTI, "locally maintained", "mapping rule", and "locally generated" are used. The UE and the NW pre-store / maintain a mapping table and parameters, such as the sub-region ID. Both the UE and the NW can independently generate the G-RNTI. The UE also monitors the C-RNTI and other necessary RNTIs in other procedures that need to be performed simultaneously. Step 4: The UE, the source cell, and the target cell may perform the handover.

[0064] In summary, both the UE and the NW know and maintain the parameters and / or rules, and can independently generate the G-RNTI without changing or sending any relevant signaling. In some examples, the rule is the mapping relationship between the parameters and the G-RNTI. This mapping can be N-to-one or one-to-one, and the mapping format can be a table, where N is a positive integer greater than 1. In certain examples, the rule can be static or dynamic configured by the NW. Figure 10 An example of the mapping table is shown. The NW may send the scrambled HO signaling / data or other necessary signaling / data to the UEs in the same group via the G-RNTI. The UE may monitor the G-RNTI to receive possible multicast handover signaling / data, and at the same time also monitor the C-RNTI and other necessary RNTIs to perform other procedures.

[0065] Embodiment 2: "Locally maintained", "functional rule", and "locally generated"

[0066] In some embodiments, at least one parameter and / or G-RNTI derivation rule is maintained by the UE and the NW respectively, the G-RNTI derivation rule is a functional rule, and the G-RNTI is generated by the UE and the NW respectively.

[0067] The difference between this embodiment and Embodiment 1 is that the rule is a functional rule.

[0068] Figure 11 Shows that in some examples, the multicast transmission of NTN-NTN handover includes the following steps:

[0069] In step 0: The UE and the source cell can perform measurement control and reporting. In step 1: The source cell can make a HO decision. In step 2: The source cell sends the multicast HO signaling encrypted with G-RNTI to the UEs in the same group, and the UE can receive the signaling by monitoring the G-RNTI. In step 3: The source cell sends specific HO signaling to the UE through dedicated signaling. In addition, regarding the UE's monitoring of G-RNTI, "local maintenance", "functional rules", and "locally generated" are used. The UE and the NW pre-store / maintain a mapping table and parameters such as the sub-region ID. The UE and the NW can independently generate G-RNTI. The UE also monitors the C-RNTI and other RNTIs required for other procedures to be performed simultaneously. Step 4: The UE, the source cell, and the target cell can perform handover.

[0070] Both the UE and the NW are aware of and maintain the parameters and / or rules, can independently generate G-RNTI, and do not need to change or send any relevant signaling.

[0071] The NW can send the HO signaling / data encrypted with G-RNTI or other necessary signaling / data to the UEs in the same group. Further, the UE can monitor the G-RNTI to receive possible multicast HO signaling / data or other signaling / data, and also monitors the C-RNTI and other RNTIs required for other procedures to be performed simultaneously.

[0072] Figure 12 Some examples of functional rules are shown. Specifically, the following are some examples of functional rules.

[0073] G-RNTI = function1(sub-region ID)

[0074] G-RNTI = function2(sub-region ID, PLMN)

[0075] G-RNTI = function1(sub-region ID, frequency information)

[0076] G-RNTI = function3(sub-region ID, PLMN, UE location)

[0077] G-RNTI = function4(parameter1, parameter2,..., parameterN)

[0078] G-RNTI = function1(slot information of the region / sub-region, frequency information of the region / sub-region), etc.

[0079] More specifically, in some examples, the function can be in the following form.

[0080] G-RNTI = N + sub-region ID + A × t_id + B × f_id

[0081] G-RNTI = N + s_id + A × t_id + B × f_id + D × carrier_id

[0082] s_id / t_id / f_id: Any relevant parameter

[0083] carrier_id: Frequency information (downlink / uplink)

[0084] "Region" here means any region related to G-RNTI generation.

[0085] Embodiment 3: "NW Delivery", "Mapping Rule", and "Local Generation"

[0086] In some embodiments, at least one parameter and / or G-RNTI derivation rule is passed from the UE to the NW, and / or from the NW to the UE. The G-RNTI derivation rule is a mapping rule, and the G-RNTI is generated by the UE and the NW respectively.

[0087] The difference between this embodiment and Embodiment 1 is that the parameter and / or rule is passed from the NW to the UE or vice versa (from the UE to the NW).

[0088] Figure 13 Shows an example of the parameter and / or rule that needs to be passed from the NW to the UE in the following steps.

[0089] The following steps may include: The source cell sends the parameters and / or mapping table for generating G-RNTI to the UE. The transmission can be in broadcast mode. The UE and the source cell can perform measurement control and reporting. The source cell can make a handover decision. The source cell sends the group common handover signaling with confused G-RNTI to the UEs belonging to the same group, and the UE can receive the signaling by monitoring the G-RNTI. The source cell sends the UE-specific handover signaling to the UE through dedicated signaling. The UE, the source cell, and the target cell can perform the handover. In addition, regarding the UE monitoring the G-RNTI, "Network Delivery", "Mapping Rule", and "Local Generation" are used. Both the UE and the NW can generate the G-RNTI independently. The UE also monitors the C-RNTI and the RNTIs required for other procedures that the UE needs to perform simultaneously.

[0090] In some examples, both the UE and the NW can generate the G-RNTI independently, but the parameters and / or rules for G-RNTI generation are not initially retained in the UE, but are delivered by the network. In some examples, both the UE and the network can generate the G-RNTI independently, but the parameters and / or rules for G-RNTI generation are not initially retained in the network, but are delivered by the UE. This rule is the "Mapping Rule".

[0091] Embodiment 4: "Network Delivery", "Functional Rule", and "Local Generation".

[0092] The difference between this embodiment and Embodiment 2 is that the parameters and / or rules are sent from the NW to the UE or vice versa (from the UE to the NW). The difference between this embodiment and Embodiment 3 is that the rule is a functional rule, and the functional rule is the same as that described in Embodiment 2.

[0093] Figure 14 An example of transferring parameters and / or rules from the NW to the UE is shown.

[0094] The following steps may be included: The source cell sends parameters and / or rules for generating the G-RNTI to the UE. The transmission can be in a broadcast manner. The UE and the source cell can perform measurement control and reporting. The source cell can make a handover decision. The source cell sends group-common handover signaling that confuses the G-RNTI to the UEs belonging to the same group in the NTN cell, and the UE can receive the signaling by monitoring the G-RNTI. The source cell sends UE-specific handover signaling to the UE through dedicated signaling. The UE, the source cell, and the target cell can perform the handover. In addition, regarding the UE monitoring the G-RNTI, "network delivery", "functional rule", and "locally generated" are used. Both the UE and the NW can generate the G-RNTI autonomously. The UE also monitors the C-RNTI and the RNTIs required for other procedures that the UEs need to perform simultaneously.

[0095] In some examples, the UE and the NW can generate the G-RNTI autonomously, but the parameters and / or rules for G-RNTI generation are not initially retained by the UE, but are provided by the NW. In other examples, both the UE and the NW can generate the G-RNTI autonomously, but the parameters and / or rules for G-RNTI generation are not initially retained by the NW, but are provided by the UE. The rule in this embodiment is a "functional rule".

[0096] Embodiment 5: NW Generation

[0097] In some embodiments, at least one parameter and / or G-RNTI derivation rule can be transferred from the UE to the NW, or from the NW to the UE, and the G-RNTI derivation rule can be a functional rule or a mapping rule.

[0098] The difference between this embodiment and Embodiments 1 to 4 is that the G-RNTI is generated by the NW and transferred to the UE, and the UE cannot generate the G-RNTI autonomously.

[0099] Figure 15 In the example, the multicast transmission for NTN-NTN handover includes the following steps:

[0100] The following steps may include: The UE and the source cell may perform information reporting. The source cell may make a decision. The source cell sends a group common HO signal scrambled with the G-RNTI to the UEs in the same group in the NTN cell, and the UE may receive the signal by monitoring the G-RNTI. The source cell sends a UE-specific HO signal to the UE through a dedicated signal. The UE, the source cell, and the target cell may perform HO. In addition, regarding the UE monitoring the G-RNTI, "NW generated" is used. The UE also monitors the C-RNTI and any other necessary RNTIs that the UE needs to execute simultaneously.

[0101] In this example, the UE cannot generate the G-RNTI, and the G-RNTI is generated and delivered by the NW.

[0102] Embodiment 6: UE Generation

[0103] In some embodiments, at least one parameter and / or G-RNTI derivation rule is passed from the UE to the NW and / or from the NW to the UE, and the G-RNTI derivation rule may be a functional rule or a mapping rule.

[0104] The difference between this embodiment and Embodiments 1 to 4 is that the G-RNTI is generated by the UE and passed to the NW.

[0105] The steps include: The UE and the source cell may perform information reporting, and the source cell may make a decision. The source cell sends group common handover signaling scrambled with the G-RNTI to the UEs in the same group, and the UE may receive the signaling by monitoring the G-RNTI. The source cell sends UE-specific handover signaling to the UE through dedicated signaling. The UE, the source cell, and the target cell may perform handover. In addition, regarding the UE monitoring the G-RNTI, "UE generated" is adopted. The UE also monitors the C-RNTI and any RNTIs required for other procedures that the UE needs to execute simultaneously.

[0106] In this example, the G-RNTI is generated and delivered by the UE.

[0107] Furthermore, in the above embodiments, for example, if the G-RNTI is generated by a node in the NTN system, the G-RNTI is passed from the node that generates the G-RNTI to another node in the NTN system. In some examples, if the G-RNTI is generated by two nodes in the NTN system, the G-RNTI generation rules or generation parameters of these two nodes are the same.

[0108] Figure 16 is a block diagram of a wireless communication system 700 according to an embodiment of the present disclosure. The embodiment may be implemented into the system using any appropriately configured hardware and / or software. Figure 16System 700 is shown, including radio frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory / storage 740, display 750, camera 760, sensors 770, and input / output (I / O) interface 780, connected to each other at least as shown. Application circuitry 730 may include one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and special-purpose processors, such as graphics processors and application processors. The processors may be connected to the memory / storage and configured to execute instructions stored in the memory / storage to support various applications and / or operating systems running on the system.

[0109] Although this disclosure has been described in connection with the most practical and preferred embodiments, it is understood that the disclosure is not limited to the disclosed embodiments, but is intended to cover various arrangements as long as they do not deviate from the broadest scope of interpretation of the appended claims.

Claims

1. A method for switching enhanced multicast transmission, characterized in that, Comprising: Generating a group-based radio network temporary identifier (G-RNTI) for multicast transmission / reception during a handover process, where the G-RNTI can be generated by a user equipment (UE) and the network respectively, or by the network or the UE.

2. The method for switching enhanced multicast transmission according to claim 1, wherein The G-RNTI is generated by the network and transmitted from the network to the UE via broadcast and / or multicast and / or unicast signaling; or the G-RNTI is generated by the UE and transmitted from the UE to the network.

3. The method for enhancing multicast transmission with handover according to claim 1, wherein If the G-RNTI is generated by one node, the G-RNTI is transmitted from the node that generates the G-RNTI to another node.

4. The multicast transmission method with enhanced handover according to claim 1, characterized in that If the G-RNTI is generated by two nodes, the G-RNTI generation rules or generation parameters of the two nodes are the same.

5. The multicast transmission method with switched enhancement according to any one of claims 1 to 4, characterized in that The method further comprises: generating the G-RNTI using at least one parameter and / or a G-RNTI derivation rule.

6. The method for switching enhanced multicast transmission according to claim 5, wherein The at least one parameter includes reference signal received power (RSRP), reference signal received quality (RSPQ), the distance between the UE and a reference location, the time measured by the UE, a public land mobile network (PLMN), the location of the UE, a sub-region index / ID, time slot information of the region / sub-region, orthogonal frequency division multiplexing (OFDM) information of the region / sub-region, and / or frequency information.

7. The multicast transmission method for handover enhancement according to claim 6, wherein the sub-region index / ID is static and permanent, semi-static, or dynamic.

8. The multicast transmission method with switched enhancement according to claim 6 or 7, characterized in that The sub-region index / ID is allocated in a one-dimensional format or a two-dimensional / multi-dimensional format.

9. The multicast transmission method with switched enhancement according to claim 6 or 7, characterized in that The sub-region index / ID is global or regional.

10. The method for switching enhanced multicast transmission according to claim 5, wherein The G-RNTI derivation rule includes a mapping rule or a function rule.

11. The multicast transmission method with switched enhancement according to claim 10, characterized in that, The mapping rule defines the mapping relationship between at least one parameter and the G-RNTI, and the mapping relationship includes a many-to-one mapping or a one-to-one mapping.

12. The method for switching enhanced multicast transmission according to claim 10, wherein The function rule defines the functional relationship between at least one parameter and the G-RNTI.

13. The multicast transmission method with enhanced handover according to claim 5, wherein The at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, or the at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE.

14. The multicast transmission method with enhanced handover according to claim 13, wherein The at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, the G-RNTI derivation rule is the mapping rule, and the G-RNTI is generated by the UE and the network respectively.

15. The method for switching enhanced multicast transmission according to claim 13, wherein The at least one parameter and / or the G-RNTI derivation rule are maintained by the UE and the network respectively, the G-RNTI derivation rule is the function rule, and the G-RNTI is generated by the UE and the network respectively.

16. The multicast transmission method with enhanced handover according to claim 13, wherein The at least one parameter and / or the G-RNTI derivation rule are transmitted from the UE to the network and / or from the network to the UE, the G-RNTI derivation rule is the mapping rule, and the G-RNTI is generated by the UE and the network respectively.

17. The multicast transmission method with enhanced handover according to claim 13, wherein The at least one parameter and / or the G-RNTI derivation rule are transmitted by the UE to the network and / or by the network to the UE, the G-RNTI derivation rule is the function rule, and the G-RNTI is generated by the UE and the network respectively.

18. An apparatus for switching enhanced multicast transmission, characterized in that, Comprising: A user equipment (UE) and / or a network for performing the method according to any one of claims 1 to 17.

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