MBS control channel acquisition in non-terrestrial network
By monitoring MBS control channels based on MBS service area modification periods, UE in NTN networks optimizes resource use when not interested in MBS services, addressing inefficiencies and maintaining performance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-03
- Publication Date
- 2026-04-09
AI Technical Summary
User equipment (UE) in non-terrestrial networks (NTN) inefficiently monitors multicast broadcast service (MBS) control channels when not interested in the offered services, leading to resource wastage.
Implementing mechanisms for the UE to monitor the MBS control channel (MCCH) based on an MBS service area modification period when not interested in the services, reducing resource usage by aligning monitoring frequency with service interest.
Reduces resource consumption by the UE and network when not interested in MBS services, maintaining performance without significant degradation.
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Figure CN2024123208_09042026_PF_FP_ABST
Abstract
Description
MBS Control Channel Acquisition in Non-Terrestrial NetworkBackground
[0001] A user equipment (UE) may establish a connection to at least one of multiple different networks or types of networks. For example, the UE may use a non-terrestrial network (NTN) to access a radio access network (RAN) and public land mobile network (PLMN) . The term NTN refers to a network utilizing non-terrestrial components (e.g., one or more satellites) for network access.
[0002] An NTN may include multiple multicast broadcast service (MBS) service areas where each MBS service area offers at least one MBS service. The UE may monitor an MBS control channel (MCCH) to acquire MBS services in an MBS service area. However, the UE may not be interested in the MBS services offered in a particular MBS service area. It has been identified that there is a need for mechanisms configured to control UE behavior when the UE is deployed in an MBS service area and not interested in the MBS services provided in the MBS service area.Summary
[0003] Some example embodiments are related to an apparatus having processing circuitry configured to process, based on signaling received from a base station, configuration information associated with a first multicast broadcast service (MBS) service area, wherein the first MBS service area is one of multiple MBS services areas provided by a cell of a non-terrestrial network (NTN) , determine whether the UE is interested in one or more MBS services of the MBS service area, when the UE is interested in the one or more MBS services of the MBS service area, monitor an MBS control channel (MCCH) based on an MCCH modification period configuration and when the UE is not interested in the one or more MBS services of the MBS service area, monitor the MCCH based on an MBS service area modification period.
[0004] Other example embodiments are related to a method for processing, based on signaling received from a base station, configuration information associated with a first multicast broadcast service (MBS) service area, wherein the first MBS service area is one of multiple MBS services areas provided by a cell of a non-terrestrial network (NTN) , determining whether the UE is interested in one or more MBS services of the MBS service area, when the UE is interested in the one or more MBS services of the MBS service area, monitoring an MBS control channel (MCCH) based on an MCCH modification period configuration and when the UE is not interested in the one or more MBS services of the MBS service area, monitoring the MCCH based on an MBS service area modification period.Brief Description of the Drawings
[0005] Fig. 1 shows an example network arrangement according to various example embodiments.
[0006] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0007] Fig. 3 shows an example base station according to various example embodiments.
[0008] Fig. 4 shows an example non-terrestrial network (NTN) architecture according to various example embodiments.
[0009] Fig. 5 shows a signaling diagram for multicast broadcast service (MBS) according to various example embodiments.
[0010] Fig. 6 illustrates an example of an MBS control channel (MCCH) transmission according to various example embodiments.
[0011] Fig. 7 illustrates an example deployment scenario including multiple MBS service areas according to various example embodiments.
[0012] Fig. 8 shows an example of an MBS service area modification period configuration according to various example embodiments.
[0013] Fig. 9 shows a method for acquiring MCCH based on an MBS service area modification period according to various example embodiments.Detailed Description
[0014] The example embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The example embodiments relate to a multicast broadcast service (MBS) in a non-terrestrial network (NTN) .
[0015] The example embodiments are described with regard to a user equipment (UE) . However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any appropriate electronic component.
[0016] The example embodiments are also described with regard to a Fifth Generation (5G) New Radio (NR) network. However, reference to 5G NR is merely provided for illustrative purposes. The example embodiments may be utilized with any appropriate type of network that may establish a connection to a UE and exchange information and data with the UE (e.g., 5G-Advanced networks, 6G networks, etc. ) .
[0017] The example embodiments are further described with regard to a 5G NR network integrated with an NTN utilizing one or more satellites to provide UE access to the 5G NR radio access network (RAN) . A satellite-based NTN may be deployed by a public land mobile network (PLMN) and may be further integrated with a terrestrial network (TN) of the PLMN. Throughout this description, the non-terrestrial component is generally described as a satellite. However, any reference to a satellite is only for illustrative purposes and the example embodiments may apply to other types of non-terrestrial components, e.g., airplanes, unmanned aerial vehicles (UAVs) , etc.
[0018] The example embodiments are also described with regard to a multicast broadcast service (MBS) service area configured to provide at least one MBS service. MBS generally refers to a point-to-multipoint service where the same content may be provided to multiple users. An MBS service area may correspond to a geographical area over which at least one MBS service may be provided. In one example, the MBS service area may be specific to a country. However, this example is merely provided for illustrative purposes. The geographical area for an MBS service area may be based on any appropriate factor.
[0019] An NTN may have one or more MBS service areas where each MBS service area is associated with at least one MBS service. To acquire an MBS service of the MBS service area, the UE may monitor an MBS control channel (MCCH) . The UE may then receive MBS data for an MBS service based, at least in part, on the information provided via the MCCH.
[0020] The UE may be deployed within an MBS service area of an NTN but not be interested in the MBS services of the MBS service area. For instance, the UE may not intend to use MBS data that is to be provided by the MBS sessions of the MBS service area or there may be a cost associated with the MBS data of the MBS service area. Thus, a scenario may occur where the UE is monitoring an MCCH but is not interested in the corresponding MBS services. This has been identified as an inefficient use of UE and / or network resources. According to some aspects, the example embodiments introduce techniques for controlling UE behavior with regard to monitoring MCCH when the UE is deployed in an MBS service area and the UE is not interested in the MBS services provided in the MBS service area. The example techniques may mitigate the inefficient use of UE and / or NTN resources without causing an unreasonable degradation in UE and / or NTN performance.
[0021] Fig. 1 shows an example network arrangement 100 according to various example embodiments. The example network arrangement 100 includes a UE 110. The UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, phablets, embedded devices, wearables, Internet of Things (IoT) devices, etc. The example of a single UE 110 is merely provided for illustrative purposes. An actual network arrangement may include any number of UEs being used by any number of users.
[0022] The UE 110 may be configured to communicate with one or more networks. In the example of the network arrangement 100, the network with which the UE 110 may wirelessly communicate is a 5G NR RAN 120. However, the UE 110 may also communicate with other types of networks (e.g., Sixth Generation (6G) networks, 5G advanced networks, 5G cloud RAN, a next generation RAN (NG-RAN) , a long-term evolution (LTE) RAN, a legacy cellular network, a wireless local area network (WLAN) , etc. ) and the UE 110 may also communicate with networks over a wired connection. With regard to the example embodiments, the UE 110 may establish a connection with the 5G NR RAN 120. Therefore, the UE 110 may have at least a 5G NR chipset to communicate with the NR RAN 120.
[0023] The 5G NR RAN 120 may be a portion of a PLMN that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) . The 5G NR RAN 120 may include, for example, nodes or base stations (Node Bs, eNodeBs, HeNBs, eNBS, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set.
[0024] In the example network arrangement 100, the 5G NR RAN 120 includes a base station (e.g., gNB 120A) that may be in a terrestrial network (TN) deployment or a non-terrestrial network (NTN) deployment. For example, a satellite-based system may be integrated with the 5G NR RAN 120 to provide network access to the UE 110 in the NTN deployment and the base station may, in some cases, be located on a non-terrestrial component, e.g., a satellite. An example NTN network architecture will be described in greater detail below with reference to Fig. 4.
[0025] The UE 110 may connect to the 5G NR-RAN 120 via the gNB 120A. Any association procedure may be performed for the UE 110 to connect to the 5G NR-RAN 120. For example, as discussed above, the 5G NR-RAN 120 may be associated with a particular cellular provider where the UE 110 and / or the user thereof has a contract and credential information (e.g., stored on a SIM card) . Upon detecting the presence of the 5G NR-RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 5G NR-RAN 120. More specifically, the UE 110 may associate with a specific node (e.g., the gNB 120A) . However, as mentioned above, reference to the 5G NR-RAN 120 is merely for illustrative purposes and any appropriate type of RAN may be used.
[0026] In addition to the 5G NR RAN 120, the network arrangement 100 also includes a cellular core network 130, the Internet 140, an IP Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 may be considered to be the interconnected set of components that manages the operation and traffic of the cellular network. The cellular core network 130 also manages the traffic that flows between the cellular network and the Internet 140.
[0027] The IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the IP protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110. The network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130. The network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the UE 110 in communication with the various networks.
[0028] Fig. 2 shows an example UE 110 according to various example embodiments. The UE 110 will be described with regard to the example network arrangement 100 of Fig. 1. The UE 110 may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225 and other components 230. The other components 230 may include, for example, an audio input device, an audio output device, a power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, etc.
[0029] The processor 205 may be configured to execute a plurality of engines of the UE 110. For example, the engines may include an MCCH monitoring engine 235. The MCCH monitoring engine 235 may perform various operations related to the example embodiments introduced herein. For example, the MCCH monitoring engine 235 receive MCCH configuration information, determine whether the UE 110 is interested in the MBS services of an MBS service area and monitor the MCCH. These and other operations are described in greater detail below.
[0030] The above referenced engine 235 being an application (e.g., a program) executed by the processor 205 is merely provided for illustrative purposes. The functionality associated with the engine 235 may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engine may also be embodied as one application or separate applications. In addition, in some UEs, the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor. The example embodiments may be implemented in any of these or other configurations of a UE.
[0031] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to show data to a user while the I / O device 220 may be a hardware component that enables the user to enter inputs. The display device 215 and the I / O device 220 may be separate components or integrated together such as a touchscreen.
[0032] The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 225 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 205 may be operably coupled to the transceiver 225 and configured to receive from and / or transmit signals to the transceiver 225. The processor 205 may be configured to encode, decode and / or process signals (e.g., signaling from a base station of a network) for implementing any one of the methods described herein.
[0033] Fig. 3 shows an example base station 300 according to various example embodiments. The base station 300 may represent the gNB 120A or any other type of access node through which the UE 110 may establish a connection and manage network operations.
[0034] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, and other components 325. The other components 325 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and / or power sources, antenna elements, antenna panels, etc.
[0035] The processor 305 may be configured to execute a plurality of engines for the base station 300. For example, the engines may include an NTN MCCH engine 330. The NTN MCCH engine 330 may perform various operations related to operating on the MCCH of an NTN.
[0036] The above noted engine 330 being an application (e.g., a program) executed by the processor 305 is only an example. The functionality associated with the engine 330 may also be represented as a separate incorporated component of the base station 300 or may be a modular component coupled to the base station 300, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. In addition, in some base stations, the functionality described for the processor 305 is split among a plurality of processors (e.g., a baseband processor, an applications processor, etc. ) . The example embodiments may be implemented in any of these or other configurations of a base station.
[0037] The memory arrangement 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or ports that enable a user to interact with the base station 300.
[0038] The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UEs in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . Therefore, the transceiver 320 may include one or more components to enable the data exchange with the various networks and UEs. The transceiver 320 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 305 may be operably coupled to the transceiver 320 and configured to receive from and / or transmit signals to the transceiver 320. The processor 305 may be configured to encode, decode and / or process signals (e.g., signaling from a UE) for implementing any one of the methods described herein.
[0039] Fig. 4 shows an example non-terrestrial network (NTN) architecture 400 according to various example embodiments. An NTN may relate to any network using non-terrestrial components, such as satellites, airplanes, High Altitude Platform Systems (HAPS) , etc., to provide network services to a user terminal.
[0040] The NTN architecture 400 represents a network arrangement including one or more satellites, which in this example shows two satellite 410 and 420 that are integrated with a radio access network (RAN) 440. The RAN 440 may be, for example, the 5G NR RAN 120 described above with respect to Fig. 1. The NTN architecture 400 includes a gateway 430 connecting the RAN 440 with the NTN components. In the NTN architecture 400 of Fig. 4, the gateway 430 and the satellites 410 and 420 communicate via feeder links 412, 422. In some NTN deployments, satellites may be served by several gateways simultaneously.
[0041] The satellites 410 and 420 provide network services to a UE 110 via a service link (not shown) . The satellites 410 and RAN 420 may implement either a transparent payload or a regenerative payload. A transparent payload refers to an arrangement where the satellites 410 and 420 receive signals and transmit an amplified version of the signal, with a frequency conversion. For example, the satellite 410 may receive uplink communications from the UE 110 on service link frequencies and transmit an amplified version of the signal to the gateway 430 on feeder link frequencies or may receive downlink communications via the gateway 430 on feeder link frequencies and transmit an amplified version of the signal to the UE 110 on service link frequencies. A regenerative payload refers to an arrangement where the satellites 410 and 420 act as a distributed unit (DU) or a base station (e.g., a gNB) , wherein received signals are regenerated with signal-processing techniques (e.g., demodulation, decoding, switching, encoding, modulation, etc. ) before being re-transmitted.
[0042] The example NTN architecture 400 shown in Fig. 4 is not intended to limit the example embodiments in any way. NTNs may be integrated with the 5G NR RAN and / or other networks in any one of a variety of manners. For example, a typical satellite-based NTN may comprise a low earth orbit (LEO) constellation including an array of satellites and gateways with broad interconnectivity via ground-to-ground station (G2G) links, satellite-to-satellite (S2S) links, ground-to-satellite (G2S) links, and satellite-to-ground (S2G) links. Other types of satellite-based NTNs include geostationary-orbiting (GEO) satellites or medium-earth-orbiting (MEO) satellites.
[0043] The different types of NTNs each have respective strengths and weaknesses and may be deployed in a variety of scenarios, depending on the goal to be achieved, e.g., broad coverage across a large region, concentrated coverage in an urban environment or along a highly trafficked route, etc. Thus, the NTN architecture 400 described in Fig. 4 is merely provided for illustrative purposes.
[0044] The NTN may have multiple MBS service areas each configured to provide one or more MBS services in one cell. As mentioned above, some of the example embodiments relate to a scenario in which the UE 110 is deployed in an MBS service area of the NTN cell but is not interested in the MBS services of another MBS service area. For instance, the UE 110 may not intend to use MBS data that is to be provided by the MBS sessions of the MBS service area where the UE is located or there may be a cost associated with the MBS data of the MBS service area.
[0045] As will be described in greater detail below, the example embodiments introduce techniques that allow the UE 110 to limit the resources used to monitor the MCCH when the UE 110 is deployed within an MBS service area and the UE 110 is not interested in the services of the MBS service area. However, the basis on which the UE 110 determines whether or not it is interested in the MBS services of an MBS service area and why the UE 110 may not be interested in certain MBS services is beyond the scope of the example embodiments. The UE 110 may decide to use the example techniques introduced herein based for any appropriate reason.
[0046] Fig. 5 shows a signaling diagram 500 for MBS according to various example embodiments. The signaling diagram 500 includes the UE 110 and a gNB 505 of an NTN and is described with regard to a scenario in which the UE 110 is deployed within an MBS service area of an NTN.
[0047] In 510, the UE 110 receives a system information block (SIB) . The SIB may include MCCH configuration information that allows the UE 110 to receive MCCH. For example, the SIB may include parameters such as, but not limited to, a repetition period and offset for the MCCH (e.g., mcch-RepetitionPeriodandOffset information element (IE) ) , a window start slot for the MCCH (e.g., mcch-WindowStartslot IE) , a window duration for the MCCH (e.g., mcch-WindowDuration IE) and a modification period configuration (e.g., mcch-ModificationPeriod IE) . The SIB may be a SIB20, a SIB21 or any other appropriate type of SIB.
[0048] In 520, the UE 110 receives an MCCH transmission from the gNB 505. The MCCH transmission may include MBS configuration information that allows the UE 110 to receive MBS data of an MBS session for an MBS service. In some examples, the MCCH transmission may include a physical downlink control channel (PDCCH) scheduled with MCCH-radio network temporary identifier (RNTI) and MBS configuration information via the MCCH and / or physical downlink shared channel (PDSCH) . In this example, the MBS service is a broadcast service. However, the example embodiments are not limited to a broadcast MBS service and may apply to a multicast MBS service or any other appropriate type of MBS service.
[0049] The MBS configuration information provided via the MCCH may provide a list of broadcast services with ongoing sessions and the associated information for the broadcast sessions (e.g., MBS session ID, RNTI, scheduling information, neighbor cell information, etc. ) . To provide some examples, the MCCH transmission may include parameters such as, but not limited to, MBS session information (e.g., mbs-SessioninfoList IE), neighbor cell information (e.g., mbs-NeighborCellList IE) and discontinuous reception (drx) configuration for point-to-multipoint (e.g., drx-ConfigPTM-List IE) . However, the above examples are merely provided for illustrative purposes. The example embodiments may be used for MCCH that is used to provide any appropriate type of information in any appropriate manner.
[0050] In 530, the UE 110 receives a broadcast MBS service transmission. To provide a general example, using the MBS configuration information, the UE 110 may establish an MBS radio bearer (MRB) to receive MBS data from an MBS session of an MBS service.
[0051] Fig. 6 illustrates an example 600 of an MCCH transmission according to various example embodiments. The example 600 shows three consecutive MCCH modification periods 610-630.
[0052] Within each MCCH modification period, the same MCCH information may be transmitted a number of times based on a repetition period. In this example, SIB 611 and MCCH 615 are transmitted during MCCH modification period 610. Each instance of MCCH 615 includes the same MCCH information. MCCH 615 includes MCCH information that allows the UE 110 to receive MBS data for MBS session 650 and / or MBS session 655.
[0053] SIB 621 and MCCH 625 are transmitted during MCCH modification period 620. Each instance of MCCH 625 includes the same MCCH information. MCCH 625 includes MCCH information that allows the UE 110 to receive MBS data for MBS session 650 and / or MBS session 655.
[0054] SIB 631 and MCCH 635 are transmitted during MCCH modification period 630. Each instance of MCCH 635 includes the same MCCH information. MCCH 635 includes MCCH information that allows the UE 110 to receive MBS data for MBS session 660.
[0055] The MCCH information of MCCH 615 is not the same as the MCCH information of MCCH 625 or the MCCH information of MCCH 635. In this example, a SIB is provided during each modification period 610-630. However, this is only an example, a SIB is not required to be provided per MCCH modification period. Instead, a SIB may indicate a change in MCCH information. If there is no change to the MCCH information, an MCCH modification period may not include a SIB or if there is a change to the MCCH information during an MCCH modification period, the MCCH modification period may include more than one SIB. Therefore, an example of a single SIB per MCCH modification period is merely provided for illustrative purposes and an actual MCCH modification period may include any number of SIBs
[0056] From the perspective of the UE 110, the UE 110 may apply the previously acquired MCCH information until the UE 110 acquires new MCCH information. For example, the UE 110 may only receive one instance of MCCH 615 and may apply the corresponding MCCH information for the remainder of MCCH modification period without acquiring any subsequent instance of MCCH 615. However, at the next MCCH modification period 620, the UE 110 will acquire the MCCH 625 instead of continuing to apply MCCH 615.
[0057] In some examples, a notification mechanism may be used to announce the change of MCCH information. The change in MCCH information may be due to a broadcast session start, a broadcast session stop, a broadcast session change, a neighbor cell information modification or any other appropriate condition. The mechanism may include a bitmap in the MCCH scheduling downlink control information (DCI) . A first bit of the bitmap may be used to indicate the start of a new MBS service and a second bit of the bitmap may be used to indicate other MCCH information changes.
[0058] When the UE 110 receives the change notification, the UE 110 may acquire the updated MCCH in the same MCCH modification period where the notification is sent. For example, the UE 110 may receive DCI during MCCH modification period 610, acquire the updated MCCH information during the modification period 610 and apply the updated MCCH information until the UE 110 receives new MCCH information (e.g., until another change notification is received during MCCH modification period 610 or until the start of the next modification period 620) . The above examples are not intended to limit the example embodiments in any way. In an actual deployment scenario, MCCH operation may include any number of MCCH modification periods each with any appropriate number of SIBS and instances of MCCH corresponding to any appropriate number of MBS sessions.
[0059] An NTN network may provide one or more MBS service areas in one cell and each MBS service area may be associated with at least one MBS service. An example of this deployment scenario 700 is shown in Fig. 7. In the example deployment scenario 700, an NTN cell 705 has a coverage area 710. The coverage area 710 includes MBS service area 715, MBS service area 720 and MBS service area 725. Each of the MBS service areas 715-725 are associated with one or more MBS services.
[0060] The UE 110 may receive MBS service area information in a SIB (e.g., SIB20, SIB21, etc. ) or via the MCCH. The UE 110 may be deployed in an MBS service area but not be interested in the MBS services offered in that MBS service area. For example, the UE 110 may be deployed within MBS service area 720 of the example deployment 700 but not be interested in the one or more services offered in the MBS service area 720.
[0061] According to some aspects the example embodiments introduce an MBS service area modification period. As will be described in greater detail below, the MBS service area modification period may occur less often than the MCCH modification period. When the UE 110 is deployed in an MBS service area and interested in the MBS services of the MBS services area, the UE 110 may acquire the MCCH based on the MCCH modification period. However, when the UE 110 is deployed in an MBS service area and not interested in the MBS services of the MBS service area, the UE 110 may acquire the MCCH based on the MBS service are modification period. Since the MBS service area modification period occurs less often than the MCCH modification period, the UE 110 is able to limit its resources with regard to MCCH monitoring when it is deployed in an MBS service area and not interested in the corresponding MBS services.
[0062] Fig. 8 shows an example 800 of an MBS service area modification period configuration according to various example embodiments. The example 800 shows MCCH modification periods 805-860. In this example, the MBS service area modification period is configured as a multiple of the MCCH modification period. Thus, MBS service area modification periods 870-880 occur once every four MCCH modification periods. However, this example is merely provided for illustrative purposes. The example embodiments may configure the MBS service area modification period to be any multiple of the MCCH modification period. In other examples, the MBS service area modification period is scheduled to occur independently from the MCCH modification period. The example embodiments may use an MBS service area modification period that is scheduled to occur at any appropriate time.
[0063] Fig. 9 shows a method 900 for acquiring MCCH based on an MBS service area modification period according to various example embodiments. The method 900 is described from the perspective of the UE 110 deployed in an MBS service area of an NTN.
[0064] Initially, consider a scenario in which the UE 110 has no valid MCCH configuration for the current NTN cell. In 910, the UE 110 acquires the MCCH and stores the MBS service and associated MBS service area information. The MBS service area information may include MBS service area modification period configuration information. The MBS service area modification period configuration information may be provided in a SIB (e.g., SIB20, SIB21, etc. ) , in the MCCH or in any other appropriate manner. The MBS service area modification period may be represented as a multiple of the MCCH modification period or may be configured using MBS service area modification period specific parameters (e.g., periodicity, duration, start time, etc. ) .
[0065] In 915, the UE 110 determines whether the UE 110 is interested in the MBS services of the MBS service area. This may include the UE 110 using location information from internal components and / or external sources to determine its current MBS service area and determining whether the MBS services provided in that MBS service area may be used by the UE 110. However, as mentioned above, the basis on which the UE 110 determines whether or not it is interested in the MBS services of the MBS service area and why the UE 110 may not be interested in certain MBS services is beyond the scope of the example embodiments.
[0066] If the UE 110 is interested in the MBS services of the MBS service area, the method 900 continues to 920. In 920, the UE 110 monitors the MCCH based on the MCCH modification period. In 925, the UE 110 receives MBS data from an MBS session for an MBS service based on the MCCH.
[0067] Returning to 915, if the UE 110 is not interested in the MBS services of the MBS service area, the method 900 continues to 930. In 930, the UE 110 monitors the MCCH based on the MBS service area modification period. Since the MBS service are modification period occurs less often than the MCCH modification period, the UE 110 uses less resources monitoring the MCCH in 930 than it does monitoring the MCCH in 920.
[0068] In 935, the UE 110 determines that there has been a change to the configuration information associated with the MBS service area. For example, when monitoring the MCCH during the MBS service area modification period, the UE 110 may receive a DCI, a SIB, MCCH or any other appropriate type of information indicating a change to the MCCH, the MBS services and / or MBS service area information. Throughout this description, a change to any of this type of configuration information may be generally referred to as a change in MBS service area information.
[0069] Subsequently, the method 900 returns to 910. This allows the UE 110 to acquire the MCCH, update the stored MCCH information for subsequent communication and determine whether it is interested in any new MBS services offered in the MBS service area.
[0070] In one example, consider a scenario in which MBS coverage area information is provided in a SIB. When the UE 110 is not in an interested MBS service area and receives the notification about the change in the MBS coverage area configuration, the UE 110 may monitor and acquire the MCCH based on the change.
[0071] In another example, consider a scenario in which the UE 110 is deployed in an MBS service area and is interested in the MBS services of the MBS service area. The UE 110 may then be notified of a change to the MBS service area configuration information. In response, the UE 110 may monitor and acquire the MCCH based on the change.
[0072] According to some aspects, an MBS service area change may be indicated by MCCH DCI. In one approach, if the MBS service area information changes, the network may indicate the information in MCCH DCI. The DCI may use a one or more bits to indicate that there has been a change to the MBS service area information. From the perspective of the UE 110, when the UE 110 is configured to monitor the MCCH (either during the MCCH modification period or the MBS service area modification period) , the UE may first monitor for DCI. If the DCI carries an MBS service area information change indication, the UE 110 may be triggered to perform MCCH acquisition to acquire the updated MBS service area configuration information via the MCCH channel.
[0073] In another approach, the example embodiments introduce MCCH DCI masked with a new RNTI configured to notify the UE 110 of an MBS service area information change. Throughout this description, this new RNTI may be referred to as Area-MCCH RNTI. However, reference to Area-MCCH RNTI is merely provided for illustrative purposes, the example embodiment may use a currently implemented RNTI to indicate this change or may use a dedicated RNTI to indicate this change that goes by a different name. The RNTI value that is to be used to indicate the change may be hard encoded in 3GPP standards or may be provided to the UE 110 via explicit signaling.
[0074] When the UE 110 is in an MBS service area and is not interested in the MBS services of the MBS service area, the UE 110 may monitor the MCCH for the DCI masked by the Area-MCCH RNTI. If the UE 110 receives DCI masked by the Area-MCCH RNTI, the UE 110 may receive the updated configuration information via the MCCH and acquire the updated MBS service area information. When the UE 110 is in an MBS service area and is interested in the MBS services of the MBS service area, the UE 110 may not monitor for DCI masked by the Area-MCCH RNTI.
[0075] According to some aspects, an MBS service area change may be indicated by paging DCI. In one example, one bit in the short message of the paging DCI may be used to indicate whether the MBS service area has changed. The example embodiments are not limited to this example and the paging DCI may indicate the MBS service area change in any appropriate manner.
[0076] With this approach, the UE 110 may monitor for paging using any appropriate mechanism. When the UE 110 acquires paging DCI that indicates an MBS service area information change, the UE 110 may monitor MCCH in a next MCCH modification period or MBS service area modification period to acquire the updated MBS service area information.
[0077] According to some aspects, an MBS service area change may be indicated by a paging record in a paging message. With this approach, the paging record may bs used to carry the MBS service area change information. A new paging record may be introduced for this purpose that is configured to carry an MBS service area change indication and / or specific MBS service and associated MBS service area change information. From the perspective of the UE 110, in response to the paging record, the UE 110 monitors MCCH to acquire the updated service and / or service area configuration. If the paging record carries specific MBS service and / or MBS service area change information, the UE 110 may then determine if the updated MBS service area information is relevant to the current location of the UE 110 or the change is related to an MBS service the UE is interested in, the UE 110 may start to monitor MCCH to acquire the updated service and / or service area information.
[0078] Examples
[0079] In a first example, a method, comprising processing, based on signaling received from a base station, configuration information associated with a first multicast broadcast service (MBS) service area, wherein the first MBS service area is one of multiple MBS services areas provided by a cell of a non-terrestrial network (NTN) , determining whether the UE is interested in one or more MBS services of the MBS service area, when the UE is interested in the one or more MBS services of the MBS service area, monitoring an MBS control channel (MCCH) based on an MCCH modification period configuration and, when the UE is not interested in the one or more MBS services of the MBS service area, monitoring the MCCH based on an MBS service area modification period.
[0080] In a second example, the method of the first example, wherein the MBS service area modification period is scheduled to occur less frequently than the MCCH modification period.
[0081] In a third example, the method of the second example, wherein the MBS Service area modification period is configured as a multiple of the MCCH modification period.
[0082] In a fourth example, the method of the first example, further comprising processing, based on signaling received from the base station, a system information block 20 (SIB20) comprising configuration information for the MBS service area modification period.
[0083] In a fifth example, the method of the first example, further comprising processing, based on signaling received from the base station during the MBS service area modification period, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area.
[0084] In a sixth example, the method of the first example, further comprising processing, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area and monitoring the MCCH in response to the DCI.
[0085] In a seventh example, the method of the sixth example, wherein the DCI comprises a single bit configured to indicate the change to the configuration information associated with the first MBS service area.
[0086] In an eighth example, the method of the sixth example, wherein the DCI comprises one or more bit configured to indicate an MBS service area status.
[0087] In a ninth example, the method of the first example, further comprising processing, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area, wherein the DCI is masked with a radio network temporary identifier (RNTI) configured to indicate the change to the configuration information associated with the first MBS service area.
[0088] In a tenth example, the method of the ninth example, wherein the RNTI is one of explicitly signaled to the UE by the base station or hard encoded.
[0089] In an eleventh example, the method of the first example, further comprising processing, based on signaling received from the base station, paging downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area, wherein the paging DCI includes a short message configured to indicate the change to the configuration information associated with the first MBS service area.
[0090] In a twelfth example, the method of the first example, further comprising processing, based on signaling received from the base station, a paging message configured to indicate a change to the configuration information associated with the first MBS service area.
[0091] In a thirteenth example, the method of the twelfth example, wherein the paging message includes a paging record configured to indicate the change to the configuration information associated with the first MBS service area.
[0092] In a fourteenth example, the method of the twelfth example, wherein the paging message includes a paging record comprising a change to a MBS service of the MBS service area.
[0093] In a fifteenth example, a processor configured to perform any of the methods of the first through fourteenth examples.
[0094] In a sixteenth example, a user equipment (UE) configured to perform any of the methods of the first through fourteenth examples.
[0095] Those skilled in the art will understand that the above-described example embodiments may be implemented in any suitable software or hardware configuration or combination thereof. An example hardware platform for implementing the example embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc. The example embodiments described above may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.
[0096] Although this application described various embodiments each having different features in various combinations, those skilled in the art will understand that any of the features of one embodiment may be combined with the features of the other embodiments in any manner not specifically disclaimed or which is not functionally or logically inconsistent with the operation of the device or the stated functions of the disclosed embodiments.
[0097] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0098] It will be apparent to those skilled in the art that various modifications may be made in the present disclosure, without departing from the spirit or the scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalent.
Claims
1.An apparatus comprising processing circuitry configured to:process, based on signaling received from a base station, configuration information associated with a first multicast broadcast service (MBS) service area, wherein the first MBS service area is one of multiple MBS services areas provided by a cell of a non-terrestrial network (NTN) ;determine whether the UE is interested in one or more MBS services of the MBS service area;when the UE is interested in the one or more MBS services of the MBS service area, monitor an MBS control channel (MCCH) based on an MCCH modification period configuration; andwhen the UE is not interested in the one or more MBS services of the MBS service area, monitor the MCCH based on an MBS service area modification period.2.The apparatus of claim 1, wherein the MBS service area modification period is scheduled to occur less frequently than the MCCH modification period.3.The apparatus of claim 2, wherein the MBS Service area modification period is configured as a multiple of the MCCH modification period.4.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station, a system information block 20 (SIB20) comprising configuration information for the MBS service area modification period.5.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station during the MBS service area modification period, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area.6.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area; andmonitor the MCCH in response to the DCI.7.The apparatus of claim 6, wherein the DCI comprises a single bit configured to indicate the change to the configuration information associated with the first MBS service area.8.The apparatus of claim 6, wherein the DCI comprises one or more bit configured to indicate an MBS service area status.9.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area, wherein the DCI is masked with a radio network temporary identifier (RNTI) configured to indicate the change to the configuration information associated with the first MBS service area.10.The apparatus of claim 9, wherein the RNTI is one of explicitly signaled to the UE by the base station or hard encoded.11.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station, paging downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area, wherein the paging DCI includes a short message configured to indicate the change to the configuration information associated with the first MBS service area.12.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signaling received from the base station, a paging message configured to indicate a change to the configuration information associated with the first MBS service area.13.The apparatus of claim 12, wherein the paging message includes a paging record configured to indicate the change to the configuration information associated with the first MBS service area.14.The apparatus of claim 12, wherein the paging message includes a paging record comprising a change to a MBS service of the MBS service area.15.A method, comprising:processing, based on signaling received from a base station, configuration information associated with a first multicast broadcast service (MBS) service area, wherein the first MBS service area is one of multiple MBS services areas provided by a cell of a non-terrestrial network (NTN) ;determining whether the UE is interested in one or more MBS services of the MBS service area;when the UE is interested in the one or more MBS services of the MBS service area, monitoring an MBS control channel (MCCH) based on an MCCH modification period configuration; andwhen the UE is not interested in the one or more MBS services of the MBS service area, monitoring the MCCH based on an MBS service area modification period.16.The method of claim 15, wherein the MBS service area modification period is scheduled to occur less frequently than the MCCH modification period.17.The method of claim 15, further comprising:processing, based on signaling received from the base station, a system information block 20 (SIB20) comprising configuration information for the MBS service area modification period.18.The method of claim 15, further comprising:processing, based on signaling received from the base station during the MBS service area modification period, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area.19.The method of claim 15, further comprising:processing, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area; andmonitoring the MCCH in response to the DCI.20.The method of claim 15, further comprising:processing, based on signaling received from the base station, downlink control information (DCI) indicating a change to the configuration information associated with the first MBS service area, wherein the DCI is masked with a radio network temporary identifier (RNTI) configured to indicate the change to the configuration information associated with the first MBS service area.
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