Method for processing scheduling information for inactive period in mobile communication system supporting NTN, and apparatus therefor

Abstract

The present document relates to a method for processing scheduling information for an inactive period in a mobile communication system supporting a non-terrestrial network (NTN), and an apparatus therefor. To this end, a communication method of a user equipment (UE) comprises: receiving system information on an active time period of a specific cell of a network; determining the active time period of the specific cell on the basis of the system information; and if downlink control information (DCI) including scheduling information on an inactive time period of the specific cell is received, (1) determining the DCI as an error or (2) changing the active time period of the specific cell.

Description

Method for processing scheduling information for inactive sections in a mobile communication system supporting NTN and device therefor

[0001] The following description relates to a mobile communication system supporting a Non-Terrestrial Network (NTN), and more specifically, to a method for processing scheduling information for an inactive period in a mobile communication system supporting an NTN, and to a device therefor.

[0002] 3GPP (3rd Generation Partnership Project), which leads the technical standards for mobile communication systems rd The Generation Partnership Project is discussing the introduction of NTN to support non-terrestrial networks such as satellites in LTE and 5G.

[0003] Discussions on NTN have been ongoing since Release 16, and Release 19 is exploring items to improve downlink coverage, improve uplink capacity / speed, support broadcast services over satellite networks, and support base station mode.

[0004] Meanwhile, various technologies are being proposed to secure the number of available beams to improve the downlink coverage of NTN.

[0005] Accordingly, in one aspect of the present invention, a method and a device therefor are proposed for setting a beam hopping pattern to secure the number of available beams for improving downlink coverage in a mobile communication system supporting NTN, and performing communication based thereon.

[0006] In addition, in an embodiment of the present invention, when scheduling information for an inactive period of a specific cell is received according to the above-described beam hopping pattern, a method for processing the same from the user equipment (UE) perspective and a device therefor are provided.

[0007] The technology proposed below is assumed to be applicable not only to the current 5G system but also to 6G and subsequent mobile communication systems. Therefore, terms such as 'NTN', 'gNB', 'SIB (System Information Block) 1', and 'SIB 19' used in 5G may be considered as replacements for other terms in the next-generation standard corresponding to the basic concepts of satellite-based communication, network nodes corresponding to base stations, basic system information units for subsequent system information transmission, and system information units for NTN, respectively. However, for the convenience of the explanation below, terms specified in the current 5G standard may be used.

[0008] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0009] In one aspect of the present invention for solving the above-described problem, a method for a user equipment (UE) to perform communication with a network in a mobile communication system supporting a Non-Terrestrial Network (NTN), the method comprising: receiving system information on an active time period of a specific cell of the network; determining an active time period of the specific cell based on the system information; and, when receiving downlink control information (DCI) including scheduling information on an inactive time period of the specific cell, (1) determining the DCI as an error or (2) changing the active time period of the specific cell is proposed.

[0010] In another aspect of the present invention for solving the above-described problem, a user equipment (UE) for performing communication with a network in a mobile communication system supporting a Non-Terrestrial Network (NTN), the UE comprises: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: receiving system information on an active time period of a specific cell of the network; determining an active time period of the specific cell based on the system information; and, when receiving downlink control information (DCI) including scheduling information on an inactive time period of the specific cell, (1) determining the DCI as an error, or (2) changing the active time period of the specific cell.

[0011] In one embodiment, the UE may be configured not to expect scheduling information for the inactivity time interval of the particular cell.

[0012] According to one embodiment, when the DCI includes scheduling information for an inactive time period of the specific cell, the active time period of the specific cell can be extended by a time period required for data transmission and reception according to the scheduling information.

[0013] According to one embodiment, if the DCI includes scheduling information spanning an inactive time interval and an active time interval of the specific cell, the DCI may be determined to be an error.

[0014] According to one embodiment, when the DCI includes scheduling information spanning an inactive time interval and an active time interval of the specific cell, data can be transmitted and received based only on scheduling information for the active time interval.

[0015] According to one embodiment, when the DCI includes scheduling information spanning an inactive time interval and an active time interval of the specific cell, the active time interval of the specific cell can be changed to perform data transmission and reception according to the scheduling information.

[0016] According to one embodiment, when fixed allocation scheduling information for allocating resources for the inactive time interval of the specific cell is set, data transmission and reception may not be performed during the inactive time interval.

[0017] At this time, after revisiting the specific cell, data transmission and reception can be performed based on the fixed allocation scheduling information without receiving additional DCI.

[0018] Alternatively, after revisiting the specific cell, if activated through additional DCI, data transmission and reception may be performed based on the fixed allocation scheduling information.

[0019] According to the embodiments of the present invention as described above, downlink coverage can be efficiently improved through a beam hopping pattern in a mobile communication system supporting NTN.

[0020] In addition, when receiving scheduling information for an inactive period of a specific cell according to the beam hopping pattern described above, a processing method suitable for each situation can be clearly provided to the UE.

[0021] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0022] Figure 1 is a diagram illustrating the elements of NTN discussed in 3GPP.

[0023] Figure 2 is a drawing to explain the concept of the number of beams available in a system supporting NTN.

[0024] FIG. 3 is a diagram for explaining communication between a UE and a network in a mobile communication system supporting NTN according to one embodiment of the present invention.

[0025] FIG. 4 is a diagram for explaining the concept of SSB transmission cycle and residence time borrowed in one embodiment of the present invention.

[0026] FIGS. 5 to 7 are drawings for explaining time / frequency tracking errors when extending an SSB transmission cycle according to one embodiment of the present invention.

[0027] FIG. 8 is a diagram for explaining UE connection delay when extending an SSB transmission cycle according to one embodiment of the present invention.

[0028] FIG. 9 and FIG. 10 are drawings for explaining SSB transmission settings according to one embodiment of the present invention.

[0029] FIG. 11 is a drawing specifically explaining a scheduling processing problem for an inactive section according to one embodiment of the present invention.

[0030] FIG. 12 is a drawing for explaining a method of expanding an activation section according to one embodiment of the present invention.

[0031] FIG. 13 is a diagram for explaining a case where scheduling information includes repeated resource allocation according to one embodiment of the present invention.

[0032] FIG. 14 is a diagram for explaining a case where scheduling information includes aggregated allocation according to one embodiment of the present invention.

[0033] FIG. 15 is a diagram for explaining a case of semi-static / fixed resource allocation according to one embodiment of the present invention.

[0034] Figure 16 illustrates a wireless device to which the present technology can be applied.

[0035] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and similar parts have been designated with similar reference numerals throughout the specification.

[0036] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0037]

[0038] As described above, one aspect of the present invention examines a method for securing the number of available beams in a system supporting NTN. To this end, we first examine the current state of NTN and the discussions surrounding downlink improvements within 3GPP.

[0039] Figure 1 is a diagram illustrating the elements of NTN discussed in 3GPP.

[0040] As illustrated in Figure 1, NTN generally includes the following elements:

[0041] First, it may include one or more gateways (110) that connect the NTN to a public data network. The satellite (120) may be implemented as a satellite or an Unmanned Aircraft System (UAS) as illustrated in FIG. 1, and the satellites may be classified into GEO satellites and non-GEO satellites.

[0042] A GEO satellite (120) may be served by one or more gateways (110) deployed across the satellite's target range (e.g., regional or continental range). It may be assumed that a UE (130) of a cell is served by a gateway (110).

[0043] A non-GEO satellite (120) can be successively served by one or more gateways (110) at a time. The system can ensure service and feeder link continuity between successive serving gateways for a sufficient time to perform mobility anchoring and handover.

[0044] A feeder link or wireless link may be established between the gateway (110) and the satellite (or UAS platform) (120). A service link or wireless link may be established between the UE (130) and the satellite (or UAS platform) (120).

[0045] Meanwhile, the beams generated by a satellite (or UAS platform) (120) typically generate multiple beams for a given service area bounded by its field of view. The footprints (140) of the beams may be generally elliptical, as illustrated in FIG. 1, but need not be limited thereto. The field of view of the satellite (or UAS platform) may depend on the onboard antenna diagram and the minimum elevation angle.

[0046] There may be different types of satellites (or UAS platforms) (120). The following table exemplifies types of NTN platforms.

[0047] PlatformsAltitude RangeOrbitTypical beam footprint sizeLow-Earth Orbit(LEO) satellite300-1500 kmCircular around the earth100 - 1000 kmMedium-Earth Orbit (MEO) satellite7000 - 25000 km100 - 1000 kmGeostationary Earth Orbit (GEO) satellite35 786 kmnotional station keeping position fixed in terms of terms of elevation / azimuth with respect to a given earth point200 - 3500 kmUAS platform (including HAPS)8 - 50 km (20 km for HAPS)5 - 200 kmHigh Elliptical Orbit (HEO) satellite400 - 50000 kmElliptical around the earth200 - 3500 km

[0048] Typically, GEO satellites and UAS are used to provide continental, regional, or local services, while constellations of LEO and MEO satellites are used to provide services in both the Northern and Southern Hemispheres. In some cases, these constellations can provide global coverage, including polar regions.

[0049]

[0050] Figure 2 is a drawing to explain the concept of the number of beams available in a system supporting NTN.

[0051] Since SSB can only use a limited number of indices depending on the sub-carrier spacing, it is not possible to assign an independent index to every beam pattern in systems that use more than 1,000 beam footprints, such as satellite communications.

[0052] Therefore, in order to utilize all beam footprints within the existing specifications, it is desirable to increase the maximum number of operable beam footprints through beam hopping, which changes the beam footprint mapped to each SSB index when transmitting SSB in 20 ms units. For example, if beam hopping is not used, the number of usable beam footprints in a base station using four SSB indices is 'the number of SSB indices x the number of activated beams'.

[0053] Here, the number of active beams is assumed to be the maximum number of beams that can satisfy the minimum signal level or higher, and in the example of utilizing four SSB indices as shown in Fig. 2, the number of active beams of the satellite (N Sat When the number of activeBeams is 16, the number of operable beam footprints is 64 (=4 x 16).

[0054] In addition, in embodiments of the present invention, in order to efficiently increase the number of beams that can be supported, it is assumed that the transmission cycle of SSB is extended from the existing 20 ms to 80 ms, 160 ms, 320 ms, etc., and the transmission cycle of SSB for such NTN service can be referred to as an 'extended cycle'.

[0055] FIG. 3 is a diagram for explaining communication between a UE and a network in a mobile communication system supporting NTN according to one embodiment of the present invention.

[0056] In one embodiment of the present invention, the above-described extension period corresponds to one of a plurality of candidate transmission periods, wherein it is assumed that the plurality of candidate transmission periods include periods greater than or equal to 160 ms, which is the maximum transmission period of conventional 5G. For example, the above-described extension period may be set to 320 ms or greater.

[0057] The network supporting NTN in FIG. 3 may be a node corresponding to a specific cell in the mobile communication system described above with respect to FIG. 2. In addition, the network supporting NTN in FIG. 3 may determine a beam hopping pattern by considering the number of operating cells, the number of activated beams, etc., as described above with respect to FIG. 2 (S310).

[0058] Based on the beam hopping pattern determined in this manner, the network can transmit system information (SI) to the UE (S320). The system information may include information about the activation time interval of a specific cell in the network.

[0059] Additionally, system information according to one embodiment of the present invention may include one or more pieces of information from among SSB transmission cycle, dwell time, and revisit time.

[0060] A UE that receives such system information can determine the activation time interval of a specific cell (Cell #n) based on the received system information (S330), and can also use the 'stay time' among the above-described system information as information indicating the activation time of the corresponding cell (Cell #n).

[0061] Thereafter, the UE receives downlink control information (DCI) to perform communication with the network, and the DCI may include at least one of scheduling information for transmitting an uplink signal (e.g., PUSCH (Physical Uplink Shared Channel)) or scheduling information for transmitting a downlink signal (e.g., PDSCH (Physical Downlink Shared Channel)).

[0062] However, in the embodiments of the present invention described below, when the DCI includes scheduling information for uplink / downlink signal transmission for an inactive period of the corresponding cell (Cell #n) according to beam hopping (S340), a method for efficiently processing this is proposed.

[0063] In one aspect of the present invention, a method for processing scheduling information by judging it as a network error is specifically proposed, and in another aspect of the present invention, a method for extending an activation time (e.g., a stay time) for communication according to the scheduling information is specifically proposed.

[0064]

[0065] Below, the concept of extending the above-described SSB transmission cycle is explained in more detail.

[0066] FIG. 4 is a diagram for explaining the concept of SSB transmission cycle and residence time borrowed in one embodiment of the present invention.

[0067] When transmitting a downlink signal in a beam hopping manner in a mobile communication system using NTN, SSB and / or SI can be transmitted in units of a specific active beam (active beam -1) as illustrated in FIG. 4. The example illustrated in FIG. 4 assumes that the SSB transmission period (410) is set to 160 ms.

[0068] Within the SSB transmission cycle (410), SSB / SI can be Time Domain Multiplexed (TDM) in units of 20 ms, and the 20 ms can be referred to as a TDM gap (TDM gap; 430). This TDM gap (430) can correspond to a footprint corresponding to each SSB, and data transmission and reception can be performed during the residence time (420) other than the SSB / SI transmission section in each TDM gap (430a, 430b).

[0069] In Fig. 4, the residence time (420) is separately illustrated as a data transmission period other than the SSB / SI reception period, but the residence time (420) may be defined differently depending on the embodiment, including the SSB / SI reception period, as a period in which UL / DL signal transmission and reception are possible through the cell. When the residence time is defined as in Fig. 4, in the embodiments below, the activation time period may be viewed as including the SSB / SI reception period, rather than corresponding to the residence time.

[0070]

[0071] FIGS. 5 to 7 are drawings for explaining time / frequency tracking errors when extending an SSB transmission cycle according to one embodiment of the present invention.

[0072] Specifically, FIG. 5 illustrates the transmission timing of SSB, SIB 1 / 19 and the transmission timing of downlink control channel (PDCCH) / downlink shared channel (PDSCH) for each UE when 640 ms is applied as an extension period, and FIG. 6 and FIG. 7 illustrate the time / frequency tracking error of each signal accordingly.

[0073] As illustrated in FIG. 5, SSB1 and SUB19 transmitted through common signal sweeping within a 10 ms interval have no time / frequency tracking error as illustrated at 610 and 620 in FIG. 6, respectively. In contrast, PDCCH / PDSCH may experience a certain level of time / frequency tracking error as illustrated at 710 and 720 in FIG. 7 due to the influence of the extended period, but the level of the above errors is judged to be tolerable in terms of securing downlink coverage as described above with respect to FIG. 2.

[0074] FIG. 8 is a diagram for explaining UE connection delay when extending an SSB transmission cycle according to one embodiment of the present invention.

[0075] As illustrated in FIG. 8, it may take approximately 75 ms for one UE to transition from RRC_INACTIVE state to RRC_CONNECTED state.

[0076] If, in one embodiment of the present invention, an extended period is applied, additional time delay may occur accordingly.

[0077] For example, if the SSB transmission period is extended to 640 ms, the UE's network access delay time is (640 + 75 =) 715 ms, which can be considered a tolerable level for expanding the downlink coverage of the NTN described above.

[0078] Accordingly, in one embodiment of the present invention, the SSB transmission period is set to be scalable as described above, and specifically, it is proposed to set it to one of a plurality of candidate SSB transmission periods and notify the UE through signaling, and at this time, the candidate SSB transmission period includes a period of 160 ms or more, and can include up to 320 ms and 640 ms as in the examples described above.

[0079]

[0080] FIG. 9 and FIG. 10 are drawings for explaining SSB transmission settings according to one embodiment of the present invention.

[0081] In the NR system, the SSB transmission period is set to any one of the candidate SSB transmission periods of 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms, but generally, the 20 ms transmission period is most commonly used, and Fig. 9 illustrates the SSB transmission form according to this. The setting for this is illustrated in the structure that signals through ssb-periodicityServingCell when transmitting the SSB transmission period as shown in Fig. 10 through the ServingCellConfigCommon information element of SIB 1.

[0082] However, in one embodiment of the present invention, unlike the current NR system, it is proposed to design the system so that an extended period can be applied, and accordingly, as shown in FIG. 10, an extended period of 320 ms, 640 ms, etc. can be additionally included in the candidate SSB transmission period.

[0083] Meanwhile, as illustrated in FIG. 9, transmission of SSBs within an SSB burst can be performed within a 5 ms window. As illustrated in FIG. 9, the time domain pattern for transmitting SSBs within an SSB burst can vary depending on the subcarrier spacing and frequency band (910a - 950).

[0084] The maximum number of transmitted SSBs within an SSB burst (i.e., a 5 ms period) can be set to 4 in the band up to 3 GHz, 8 in the 3-6 GHz band, and 64 in the 6-52.6 GHz band. However, the actual number of transmitted SSBs within this upper limit range can be set separately.

[0085] In the example of FIG. 9, 910a exemplarily shows a case where the subcarrier spacing (SCS) is 15 kHz in a band below 3 GHz, 910b exemplarily shows a case where the SCS is 15 kHz in a band between 3 and 6 GHz, 920a exemplarily shows a case where the SCS is 30 kHz in a band below 3 GHz, 920b exemplarily shows a case where the SCS is 30 kHz in a band between 3 and 6 GHz, 930a exemplarily shows a case where the SCS is 30 kHz in a band below 3 GHz, 930b exemplarily shows a case where the SCS is 30 kHz in a band between 3 and 6 GHz, 940 exemplarily shows a case where the SCS is 120 kHz in a band below 6 GHz, and 950 exemplarily shows a case where the SCS is 240 kHz in a band above 6 GHz.

[0086] Although the example of FIG. 9 illustrates various transmission patterns according to the band and SCS, it is not excluded that the SSB transmission pattern may vary by additional parameters in one embodiment of the present invention.

[0087] In one embodiment of the present invention, it is assumed that the UE operates under the assumption of a default SSB transmission period before receiving system information (SI corresponding to SIB 1 of NR) from the network regarding which SSB transmission period among the extended SSB transmission period candidates as illustrated in FIG. 10 is set. For example, the default SSB transmission period may be 20 ms as illustrated in FIG. 9 and FIG. 10 , and a different default transmission period may also be used in the NTN.

[0088]

[0089] FIG. 11 is a drawing specifically explaining a scheduling processing problem for an inactive section according to one embodiment of the present invention.

[0090] Assuming a scenario using LEO600km Set1-1, which is currently being considered for use in FR1 in NTN, a total of 1058 beam footprints are set, but since a maximum of 106 beam footprints can be supported simultaneously, it can be seen that only about 10% of the beam footprints can be supported simultaneously.

[0091] Accordingly, it is desirable to secure downlink coverage by revisiting each cell (i.e., Cell#1, Cell#2, Cell#3, etc.) by applying beam hopping method, and therefore, as shown in Fig. 11, the time interval until revisiting a specific cell (Cell#1) is called revisit time (T rev ) can be defined. In the example of Fig. 11, this revisit time (T rev ) is set to 320 ms.

[0092] This revisit time (T rev ) is the time for which the cell (Cell#1) is activated, called the residence time (T dwell ) can be defined as, and in the example of Fig. 11, this residence time (T dwell ) is set to 20 ms.

[0093] In the example of Fig. 11, the SSB transmission period is also the revisit time (T rev ) can be seen to be set to 320 ms, the same as the SSB transmission cycle. In this way, the revisit time (T rev ) may be the same as, but may be set differently.

[0094]

[0095] In the embodiment illustrated in FIG. 11, when DCI received in the active period (1110) of the first cell (Cell#1) schedules resources (1130) for data transmission to multiple resources, we will specifically examine how to regulate data transmission and reception in resources (1140) scheduled for data transmission within the inactive period (1120).

[0096]

[0097] The data scheduling forms can be categorized into (1) dynamic scheduling without repetition, (2) dynamic scheduling with repetition settings, (3) dynamic scheduling with aggregation applied, and (4) semi-static or fixed scheduling. Below, the operation of the UE according to each scheduling form is specifically described.

[0098]

[0099] Example 1 - Error Handling

[0100] In this embodiment, it is assumed that the UE does not expect to receive scheduling information for the inactive interval.

[0101] Specifically, for the downlink in the inactive period, the UE may (i) not monitor the downlink control channel (PDCCH), and (ii) not receive the downlink shared channel (PDSCH) by dynamic scheduling and (semi-)static scheduling by DCI.

[0102] Additionally, for the uplink in the inactive period, the UE may not (i) transmit the scheduled uplink shared channel (PUSCH) via DCI or fixed allocation resources, and (ii) perform periodic / semi-static CSI (Channel Status Information) reporting and periodic / semi-static SRS (Sounding Reference Signal) transmission.

[0103]

[0104] Example 2 - Extending the Activation Interval

[0105] FIG. 12 is a drawing for explaining a method of expanding an activation section according to one embodiment of the present invention.

[0106] In this embodiment, when the DCI includes scheduling information (1230) for an inactive time interval (1120) of a specific cell (e.g., the first cell), it is proposed to extend (1210, 1220) the active time interval (1110) of the cell by the time interval required for transmitting and receiving data according to the DCI.

[0107] That is, according to the embodiment illustrated in FIG. 12, if a PDSCH / PUSCH (1130) scheduled with DCI is allocated to a cell deactivation period (1120), the UE can perform reception / transmission for the corresponding PDSCH / PUSCH (1130). However, the UE can extend the activation time based on the scheduled time period, and in FIG. 12, this is expressed as extending the dwell time (Tdwell).

[0108] In one embodiment of the present invention, with respect to a specific method for extending the dwell time (Tdwell), the extension can be performed by the time interval for transmitting and receiving the corresponding data.

[0109] In another embodiment of the present invention, a time interval for transmitting and receiving the data and a HARQ feedback processing time interval (T delta ) can be extended additionally. In the case of PDSCH, it is extended until the time of HARQ-ACK transmission for the corresponding PDSCH, and in the case of PUSCH, it is extended until the time of transmitting the corresponding PUSCH + T delta It can be extended by that much.

[0110] In another embodiment of the present invention, the residence time is set to T dwell It can be set to be extended by an integer multiple of . However, the extended residence time is set to include the data transmission and reception time interval.

[0111] In another embodiment of the present invention, the residence time can be set to be extended by a preset time value.

[0112] T in Fig. 12 dwell (1210) is the existing residence time, T' dwell (1220) illustrates an example of extended stay time due to scheduling.

[0113]

[0114] Example 3 - Repeated Assignment

[0115] FIG. 13 is a diagram for explaining a case where scheduling information includes repeated resource allocation according to one embodiment of the present invention.

[0116] Specifically, this embodiment examines a case where DCI schedules resources for data repetition transmission (1310) across an inactive time interval (1110) and an active time interval (1120) of a specific cell (cell#1).

[0117] First, according to one embodiment of the present invention, the UE does not expect data transmission or reception during the inactive time period (1120) of the corresponding cell, and therefore, when receiving such DCI, it may determine the DCI as an error. If the UE determines the DCI as an error, it may simply ignore it.

[0118] In another embodiment of the present invention, when the DCI includes scheduling information spanning the inactive time interval (1110) and the active time interval (1120) of a specific cell as described above, data can be transmitted and received based only on the scheduling information for the active time interval (1110). That is, the PDSCH / PUSCH can be transmitted and received based on the scheduling information for the active time interval (1110), and the scheduling information for the inactive time interval (1120) can be determined to be invalid.

[0119] In another embodiment of the present invention, when the DCI includes scheduling information spanning the inactive time interval (1110) and the active time interval (1120) of a specific cell as described above, the active time interval (1110) of the specific cell (Cell#1) may be changed as in the second embodiment described above, thereby performing PDSCH / PUSCH transmission and reception according to the DCI.

[0120]

[0121] Example 4 - Aggregated Allocation

[0122] FIG. 14 is a diagram for explaining a case where scheduling information includes aggregated allocation according to one embodiment of the present invention.

[0123] Specifically, in this embodiment, an aggregation factor is received via RRC (Radio Resource Control) signaling, DCI schedules data (PDSCH / PUSCH), and this aggregated allocation (1410) is scheduled over an inactive time interval (1110) and an active time interval (1120) of a specific cell (cell#1).

[0124] First, according to one embodiment of the present invention, the UE does not expect data transmission or reception during the inactive time period (1120) of the corresponding cell, and therefore, when receiving such DCI, it may determine the DCI as an error. If the UE determines the DCI as an error, it may simply ignore it.

[0125] In another embodiment of the present invention, when the DCI includes scheduling information spanning the inactive time interval (1110) and the active time interval (1120) of a specific cell as described above, data can be transmitted and received based only on the scheduling information for the active time interval (1110). That is, the PDSCH / PUSCH can be transmitted and received based on the scheduling information for the active time interval (1110), and the scheduling information for the inactive time interval (1120) can be determined to be invalid.

[0126]

[0127] Example 5 - Semi-static / Fixed Resource Allocation

[0128] FIG. 15 is a diagram for explaining a case of semi-static / fixed resource allocation according to one embodiment of the present invention.

[0129] According to the present embodiment, if fixed allocation scheduling information (1510) (e.g., SPS (Semi-Persistent Scheduling) PDSCH, CG (Configured Grant) PUSCH) that allocates resources for the inactive time period (1110) of a specific cell (Cell#1) is set, the UE may not perform data transmission and reception in the inactive time period (1120).

[0130] However, in this embodiment, when the beam revisits the cell (Cell#1) after the revisit time (Trev) as illustrated in FIG. 15, it is necessary to determine whether the fixed allocation scheduling information (1510a) received in the first visit will be effectively utilized in the second visit.

[0131] In one embodiment of the present invention, the UE proposes to always determine that the activated fixed allocation scheduling information (e.g., SPS PDSCH and CG PUSCH) is valid at every revisit period to the corresponding cell. That is, the UE can consider the corresponding scheduling to still be valid even after revisiting the corresponding cell without additionally receiving activation DCI for SPS PDSCH / CG PUSCH.

[0132] Meanwhile, a UE according to another embodiment of the present invention may consider that the activated fixed allocation scheduling information (e.g., SPS PDSCH and CG PUSCH) is initialized for each revisit period for the corresponding cell. That is, if the UE receives an activation DCI for SPS PDSCH / CG PUSCH after revisiting the corresponding cell, the UE may determine that the corresponding scheduling (1510b) is resumed.

[0133]

[0134] Figure 16 illustrates a wireless device to which the present technology can be applied.

[0135] Referring to FIG. 16, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR, 6G). Here, the first wireless device (100) and the second wireless device (200) can each correspond to the UE and network of FIG. 3.

[0136] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0137] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including commands for performing some or all of the processes controlled by the processor (202) or for performing the descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0138] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0139] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0140] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0141] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0142]

[0143] The detailed description of the preferred embodiments of the present invention disclosed above has been provided to enable those skilled in the art to implement and practice the present invention. While the above description has been made with reference to preferred embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the scope of the present invention. For example, those skilled in the art can utilize the individual components described in the above-described embodiments in combination with each other.

[0144] Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0145] The method for processing scheduling information for an inactive period and the device therefor in a mobile communication system supporting NTN according to the embodiments of the present invention as described above are suitable for use in a communication environment utilizing NTN discussed in 3GPP, but can also be widely used in an environment utilizing satellite-based communication in a communication method other than 3GPP.

Claims

1. In a mobile communication system supporting NTN (Non-Terrestrial Network), a method for a user equipment (UE) to perform communication with a network, Receive system information about the activation time interval of a specific cell of the above network; Based on the above system information, determining the activation time interval of the specific cell; and When receiving downlink control information (DCI) including scheduling information for the inactive time interval of the specific cell, (1) determining the DCI as an error, or (2) changing the active time interval of the specific cell, UE's communication method.

2. In paragraph 1, The UE is configured not to expect scheduling information for the inactivity time interval of the specific cell. UE's communication method.

3. In paragraph 1, If the above DCI includes scheduling information for the inactive time interval of the specific cell, Extending the activation time interval of the above specific cell by the time interval required for data transmission and reception according to the above scheduling information. UE's communication method.

4. In paragraph 1, If the DCI includes scheduling information spanning the inactive time interval and the active time interval of the specific cell, Judging the above DCI as an error, UE's communication method.

5. In paragraph 1, If the DCI includes scheduling information spanning the inactive time interval and the active time interval of the specific cell, Transmitting and receiving data based only on scheduling information for the above activation time interval, UE's communication method.

6. In paragraph 1, If the DCI includes scheduling information spanning the inactive time interval and the active time interval of the specific cell, By changing the activation time interval of the specific cell, data transmission and reception are performed according to the scheduling information. UE's communication method.

7. In paragraph 1, If fixed allocation scheduling information is set to allocate resources for the inactive time interval of the above specific cell, No data transmission or reception is performed during the above inactive time period. UE's communication method.

8. In paragraph 7, After revisiting the specific cell, data transmission and reception are performed based on the fixed allocation scheduling information without receiving additional DCI. UE's communication method.

9. In paragraph 7, After revisiting the specific cell, if activated through additional DCI, data transmission and reception are performed based on the fixed allocation scheduling information. UE's communication method.

10. In a user equipment (UE) that performs network communication in a mobile communication system supporting NTN (Non-Terrestrial Network), at least one processor; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Receive system information about the activation time interval of a specific cell of the above network; Based on the above system information, determining the activation time interval of the specific cell; and When receiving downlink control information (DCI) including scheduling information for the inactive time interval of the specific cell, (1) determining the DCI as an error, or (2) changing the active time interval of the specific cell, User device.

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