Communication based on SBFD-related UE capability information

Abstract

The present document relates to a method for efficiently notifying, to a network, that a user equipment (UE) is a sub-band full duplex (SBFD) aware UE, and performing communication on the basis of same, and an apparatus therefor. To this end, a method by which a UE notifies first type UE capability information to a network comprises: receiving, from the network, random access preamble information related to a first type UE capability; transmitting, to the network, a preamble selected on the basis of the random access preamble information; and receiving, from the network, a response message to the preamble. Here, the first type UE capability information includes full duplex (FD)-related information.

Description

Communication based on UE performance information related to SBFD

[0001] The following description relates to SBFD (Sub-Band Full Duplex)-based communication, and more specifically, to a method for efficiently notifying a network that a user equipment (UE) is an SBFD aware UE and performing communication based thereon, and to a device therefor.

[0002] In wireless communication systems, various technologies are used, such as LTE, LTE-Advanced, and WiFi, and 5G is also included.

[0003] Figure 1 shows the structure of a system for 5G communication.

[0004] Referring to FIG. 1, a Next Generation - Radio Access Network (NG-RAN) may include a base station (20) that provides user plane and control plane protocol termination to a UE (10). For example, the base station (20) may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE (10) may be fixed or mobile, and may be referred to by other terms such as a terminal, a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the base station may be a fixed station that communicates with the UE (10), and may be referred to by other terms such as a base transceiver system (BTS), an access point, etc.

[0005] The example of Fig. 1 illustrates a case that includes only gNB. The base stations (20) can be connected to each other via Xn interfaces. The base stations (20) can be connected to a 5th generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station (20) can be connected to an access and mobility management function (AMF) (30) via an NG-C interface, and can be connected to a user plane function (UPF) (30) via an NG-U interface.

[0006]

[0007] Meanwhile, 5G is giving rise to new service types, such as XR (Extended Reality), AI-based services, and self-driving cars. These services feature dynamic traffic in both downlink and uplink directions, and require low latency for packet transmission. To support these diverse new use cases, 5G services could experience explosive growth in traffic load.

[0008] On the other hand, existing semi-static or dynamic TDD UL / DL configurations may have limitations due to transmission delay and interference between operators. Existing FDD schemes may also have limitations in terms of efficient frequency resource utilization in the DL / UL directions. Therefore, the introduction of full duplex (FD) operation within a single carrier is being discussed to achieve low latency and efficient resource utilization in NR.

[0009] In order to solve the above-described problem, one aspect of the present invention proposes a SBFD (Sub-Band Full Duplex)-based communication method applicable to 5G or subsequent next-generation mobile communication systems.

[0010] 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, the term 'SBFD' used in 5G may be referred to as another term related to FD, but for the convenience of explanation below, the term of 5G will be used for the explanation.

[0011] In one aspect of the present invention, a method and a device therefor for efficiently notifying a network that a UE is an 'SBFD-aware UE' and performing communication based thereon are proposed.

[0012] 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.

[0013] In one aspect of the present invention for solving the above-described problem, a method for notifying a network of type 1 UE performance information by a user equipment (UE) in a mobile communication system is proposed, comprising: receiving random access preamble information related to type 1 UE performance from the network; transmitting a preamble selected based on the random access preamble information to the network; and receiving a response message to the preamble from the network, wherein the type 1 UE performance information includes full duplex (FD) related information.

[0014] The above FD-related information may include information indicating that the UE is a Sub-Band Full Duplex (SBFD) aware UE.

[0015] Additionally, the method may further include receiving a UE performance information request message from the network; and transmitting second type UE performance information in response to the UE performance information request message.

[0016] Transmitting the above preamble and receiving the above response message may correspond to transmitting the first message and receiving the second message of the four-step random access, respectively, and the second message may be received based on SBFD time-frequency resource allocation information.

[0017] At this time, transmission of the third message and reception of the fourth message following reception of the second message may also be based on the SBFD time-frequency resource allocation information, and the SBFD time-frequency resource allocation information may correspond to cell-specific information.

[0018] The above random access preamble information includes preamble information for the SBFD-aware UE, and the preamble information for the SBFD-aware UE can be received through system information.

[0019] The above preamble information for the SBFD-aware UE may be based on one or more of a root index or a cyclic shift value of a Zadoff-Chu sequence.

[0020] In contrast, the preamble information for the SBFD-aware UE may be based on a sequence other than the Zadoff-Chu sequence.

[0021] Additionally, transmitting the preamble and receiving the response message may correspond to transmitting message A and receiving message B of the two-step random access, respectively.

[0022] The above UE may include a UE operating in RRC_IDLE mode or RRC_INACTIVE mode.

[0023] Meanwhile, in another embodiment of the present invention, a method for notifying a network of type 1 UE performance information by a user equipment (UE) in a mobile communication system is proposed, which includes performing a random access procedure on the network, transmitting a MAC (Medium Access Control) CE (Control Element) notifying the type 1 UE performance information through an uplink shared channel transmitted to the network during the random access procedure, wherein the type 1 UE performance information includes full duplex (FD) related information.

[0024] The above random access procedure is a 4-step random access, and the MAC CE can be transmitted through the third message of the 4-step random access.

[0025] In contrast, the random access procedure is a two-step random access, and the MAC CE can be transmitted through message A of the two-step random access.

[0026] Meanwhile, in another aspect of the present invention, a method for obtaining first type user equipment (UE) performance information by a network in a mobile communication system is proposed, comprising: transmitting random access preamble information related to first type UE performance to a plurality of UEs within a predetermined cell; receiving a random access preamble from a first UE among the plurality of UEs; and transmitting a response message to the first UE depending on whether the random access preamble received from the first UE corresponds to the random access preamble information related to the first type UE performance, wherein the first type UE performance information includes full duplex (FD) related information.

[0027] In addition, as another embodiment of the present invention, a method for obtaining first type user equipment (UE) performance information by a network in a mobile communication system is proposed, the method including performing a random access procedure with one or more UEs, receiving a MAC (Medium Access Control) CE (Control Element) notifying the first type UE performance information through an uplink shared channel received from the UE during the random access procedure, wherein the first type UE performance information includes full duplex (FD) related information.

[0028] Meanwhile, in another aspect of the present invention, a user equipment (UE) configured to report type 1 UE capability information to a network in a mobile communication system is provided, comprising: 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, wherein the operations include receiving random access preamble information related to type 1 UE capability from the network; transmitting a preamble selected based on the random access preamble information to the network; and receiving a response message to the preamble from the network, wherein the type 1 UE capability information includes full duplex (FD) related information.

[0029] In addition, in another embodiment of the present invention, a user equipment (UE) configured to report first type UE performance information to a network in a mobile communication system is proposed, the UE comprising: 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 performing a random access procedure to the network, transmitting a MAC (Medium Access Control) CE (Control Element) reporting the first type UE performance information through an uplink shared channel transmitted to the network during the random access procedure, wherein the first type UE performance information includes full duplex (FD) related information.

[0030] Meanwhile, in another aspect of the present invention, a network for operating by obtaining first type user equipment (UE) capability information in a mobile communication system is proposed, comprising: 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, wherein the operations include transmitting random access preamble information related to the first type UE capability to a plurality of UEs within a predetermined cell; receiving a random access preamble from a first UE among the plurality of UEs; and transmitting a response message to the first UE depending on whether the random access preamble received from the first UE corresponds to the random access preamble information related to the first type UE capability, wherein the first type UE capability information includes full duplex (FD) related information.

[0031] In addition, in another embodiment of the present invention, a network for operating by obtaining first type user equipment (UE) performance information in a mobile communication system is proposed, the network comprising: 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 performing a random access procedure with one or more UEs, receiving a MAC (Medium Access Control) CE (Control Element) notifying the first type UE performance information through an uplink shared channel received from the UE during the random access procedure, wherein the first type UE performance information includes full duplex (FD) related information.

[0032] According to the embodiments of the present invention as described above, an SBFD-based communication method applicable to 5G or subsequent next-generation mobile communication systems can be efficiently implemented.

[0033] Specifically, the UE can efficiently notify the network that it is an 'SBFD-aware UE' and, based on this, efficiently perform SBFD time-frequency resource-based communication even during the initial access process.

[0034] 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.

[0035] Figure 1 shows the structure of a system for 5G communication.

[0036] Figure 2 is a drawing for explaining a method of performing FD operation in 5G.

[0037] FIG. 3 and FIG. 4 are drawings for comparing and explaining SBFD and SSFD during FD operation in 5G.

[0038] FIG. 5 is a diagram for explaining a method in which a UE informs a network of performance information of the UE according to a comparative example of the present invention.

[0039] FIG. 6 is a diagram illustrating a method for a UE to inform a network of FD-related performance information according to one embodiment of the present invention.

[0040] Figures 7 and 8 are drawings specifically explaining the procedures and each message of CBRA and CFRA.

[0041] FIG. 9 is a diagram for explaining a method of allocating an SBFD preamble according to one embodiment of the present invention.

[0042] Figure 10 illustrates a wireless device to which the present technology can be applied.

[0043] 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.

[0044] 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.

[0045]

[0046] As described above, one aspect of the present invention proposes a method and device for efficiently notifying a network that a UE is an "SBFD-aware UE" and performing communication based on this information. To this end, the FD method currently being discussed in 5G will be described in detail.

[0047] Figure 2 is a drawing for explaining a method of performing FD operation in 5G.

[0048] Referring to Fig. 2, a method of applying FD operation in an intra-carrier is illustrated. Specifically, the FD operation may be considered to be the Sub-Band Full Duplex (SBFD) method illustrated in Fig. 2 (a) and the Spectrum-Sharing Full Duplex (SSFD) method illustrated in Fig. 2 (b).

[0049] In the case of SBFD, transmission and reception of DL and UL can be performed using different frequency resources on the same carrier. That is, DL and UL can have different frequency resources for the same time resource. In the case of SSFD, transmission and reception of DL and UL are performed using the same frequency resources or overlapping frequency resources on the same carrier. That is, DL and UL can be assigned the same or overlapping frequency resources for the same time resource.

[0050] In the case of SBFD, it may be referred to as 'Subband-Wise Full Duplex' or 'Subband non-overlapping Full Duplex' considering the non-overlapping characteristic that distinguishes it from SSFD.

[0051]

[0052] FIG. 3 and FIG. 4 are drawings for comparing and explaining SBFD and SSFD during FD operation in 5G.

[0053] First, SBFD can be considered in FIG. 3 (a) and FIG. 4 (a). Specifically, referring to FIG. 3 (a), the subband region of the DL and the subband region of the UL may not overlap each other. In this case, a guard band may exist between the subband region of the DL and the subband region of the UL. Alternatively, referring to FIG. 2 (a), the SBFD operation can be performed based on a resource pattern of a cell or base station. For example, in the resource pattern, a half-duplex (HD) slot / symbol and an SBFD slot / symbol can be TDM'd with each other.

[0054] Alternatively, SSFD may be considered as examples such as those in FIG. 3 (b) and FIG. 4 (b). Specifically, referring to FIG. 3 (b), the subband region of the DL and the subband region of the UL may overlap with each other. Alternatively, referring to FIG. 4 (b), the SSFD operation may be performed based on a resource pattern of a cell or base station. For example, in the resource pattern, a half-duplex (HD) slot / symbol and an SSFD slot / symbol may be TDM'd with each other.

[0055]

[0056] These FD operations can be combined with existing half-duplex (HD) operations. For example, in existing half-duplex-based TDD operations, only some time resources can be used for FD operations. In the time resources where FD operations are performed, SBFD or SSFD operations can be performed.

[0057] In the case of the FD operation described above, the FD operation can be performed from both the gNB perspective and the UE perspective. For example, both the gNB and the UE can simultaneously transmit and receive DL / UL using the same or different frequency resources in the same time resource. Alternatively, only the gNB can perform the FD operation (in the same time resource), and the UE can perform the HD operation. The gNB can simultaneously transmit and receive DL and UL using the same or different frequency resources in the same time resource, but the UE can perform only DL reception or UL transmission in a specific time resource. In this case, the gNB can perform the FD operation in a way that performs DL transmission and UL reception for different UEs at the same time point (or, the same time resource).

[0058] As described above, in a network such as a gNB that performs FD operations, whether a UE can perform FD operations may be related to the UE's performance. Thus, if a UE is aware of and capable of performing FD operations in a network, the UE may be referred to as an "FD-aware UE."

[0059] In addition, among the SBFD and SSFD described above, one embodiment of the present invention proposes an FD operation using the SBFD method. The SBFD method supports HDs that do not overlap with each other in sub-band units, and thus has the advantage of being able to operate flexibly not only from the perspective of SBFD-aware UEs but also from the perspective of legacy UEs that are unaware of the SBFD situation.

[0060]

[0061] Below, a method is described for efficiently notifying the network that a UE is an SBFD-aware UE and performing communication based on this against this background.

[0062] FIG. 5 is a diagram for explaining a method in which a UE informs a network of performance information of the UE according to a comparative example of the present invention.

[0063] In general, UE performance information can be divided into network performance information and wireless performance information.

[0064] Network performance information is service-related performance information that the UE can receive from the network. As illustrated in FIG. 5, the UE (510) can transmit its network performance information to a core network, specifically, a Mobility Management Entity (MME; 530), via an NAS message, specifically, a NAS-AttachRequest message (S510). The NAS-AttachRequest message can be delivered to the MME (530) via a gNB (520a) that performs a serving cell function that provides a service to the UE (510), and the MME (530) can manage multiple gNBs (520a, 520b).

[0065] Meanwhile, with respect to the wireless performance of the UE (510), the network (specifically, the gNB (520a)) can inquire about the wireless performance of the UE (510) through a UE Capability Enquiry message (S520), and accordingly, the UE (510) can transmit UE performance information to the gNB (520a) (S530). The performance information of the UE (510) received in this manner can be transmitted to the core network when necessary (S540).

[0066]

[0067] Under the background described above, in this comparative example, it can be considered that information on whether the corresponding UE (510) is an SBFD UE is transmitted as UE performance information transmitted in response to a UE performance query (S520) of the gNB (520a). That is, whether the corresponding UE (510) is an SBFD UE can be viewed as a type of radio performance, and thus can be transmitted as radio performance information of the UE. FIG. 5 illustrates an example in which the radio performance information of the aforementioned UE (510) indicates not only whether the corresponding UE is an SBFD UE, but also whether the corresponding UE has EUTRA performance, NR performance, or MRDC performance.

[0068]

[0069] However, in the case where the UE (510) transmits information about whether it is an SBFD UE in response to a query from the gNB (520a) as in the comparative example described above, there may be a disadvantage in that the SBFD function cannot be utilized for resource allocation during the initial connection of the UE (510), for example, during a random access process. In particular, when the UE (510) performs random access in RRC-IDLE or RRC_INACTIVE mode, the notification of whether it is an SBFD UE through a query response as described above with respect to FIG. 5 may not be efficient.

[0070]

[0071] FIG. 6 is a diagram illustrating a method for a UE to inform a network of FD-related performance information according to one embodiment of the present invention.

[0072] In one embodiment of the present invention proposed in FIG. 6, it is proposed that a UE (610) informs a network (620) of FD-related performance information (hereinafter referred to as “first type UE performance information”) during a process of performing random access. Other than the FD-related performance information, wireless performance information of the UE (hereinafter referred to as “second type UE performance information”) can be provided to the network (620) through a response to a UE performance information request message of the network (620), as described above in the comparative example of FIG. 5.

[0073] Meanwhile, FD-related performance information may include information indicating that the corresponding UE (610) is an SBFD-aware UE as described above; however, the related terminology may change in 6G and next-generation mobile communications, and thus need not be limited thereto. FD-related performance information may also be referred to as non-overlapping bandwidth allocation FD-related performance information, specifically considering the comparison between SBFD and SSFD described above.

[0074] To this end, in the embodiment proposed in FIG. 6, the network (620) provides random access preamble information related to the first type UE performance to the UE (610) (S610). At this time, the information on the first type UE performance includes FD-related information, and may be information indicating an SBDF-aware UE as described above.

[0075] Specifically, in one embodiment of the present invention, as a method of configuring a PRACH preamble for SFBD-aware UEs, a method of allocating some of the existing PRACH preambles to SFBD-aware UEs is proposed. The number of such preambles may be one or more. Hereinafter, for the convenience of explanation, the preambles allocated to SFBD-aware UEs in this manner will be referred to as an SFBD preamble group.

[0076] Settings for SFBD preamble groups can be assigned to UEs during the initial access process via a System Information Block (SIB) as system information. This means that SBFD preamble groups can be configured and operated in a cell-specific manner.

[0077] Accordingly, the UE (610) can transmit a selected preamble to the network (620) based on the received random access preamble information. That is, the UE (610) can select any one preamble from the SBFD preamble group received from the network (620) through SIB and transmit it to the network (620) to inform that it is an SBFD UE.

[0078] Accordingly, the network (620) can transmit a response message to the preamble transmitted by the UE (610) (S620). At this time, the network (620) can transmit the response message based on SBFD time-frequency resource allocation information based on the recognition that the corresponding UE (610) is an SBFD-aware UE.

[0079]

[0080] As described above, the method by which a UE informs the network that it is an SBFD-aware UE through random access can be applied to various types of random access specified in 3GPP, and the following describes the types of such random access.

[0081]

[0082] Random access type

[0083] Figures 7 and 8 are drawings specifically explaining the procedures and each message of CBRA and CFRA.

[0084] Figures 7 and 8 illustrate the concepts of contention-based random access (CBRA) (710, 810) and contention-free random access (CFRA) (720, 820), respectively, in the process of performing random access between a typical UE and a base station (gNB) of LTE and NR.

[0085] First, there are the following cases where the UE performs random access.

[0086] - When the UE makes an initial access without an RRC connection with the base station.

[0087] - When the UE first connects to the target cell during the handover process.

[0088] - When a random access process is requested by a command from the base station

[0089] - When data to be transmitted through uplink occurs in a situation where the uplink time synchronization is not correct or the designated radio resources used to request radio resources are not allocated.

[0090] - When performing a recovery process in case of radio link failure or handover failure

[0091]

[0092] LTE and NR systems provide both the CBRA procedure, in which a UE randomly selects a preamble from a specific set, and the CFRA procedure, in which the base station uses a random access preamble allocated only to a specific UE. However, the CFRA procedure can only be used during the aforementioned handover process or when requested by a base station command.

[0093] Referring to drawing symbol 720 of FIG. 7, the CFRA procedure can be performed as follows.

[0094] (1) Random access preamble allocation (step 0)

[0095] As described above, the CFRA procedure can be performed (1) during a handover process and (2) when requested by a base station command. Of course, the CBRA procedure can also be performed in both of the above cases.

[0096] First, for the CFRA procedure, it is crucial to receive a designated random access preamble from the base station that is collision-free. Methods for receiving this random access preamble include a handover command and a PDCCH command. Through these methods, the UE is assigned a random access preamble.

[0097] (2) Transmitting the first message (Step 1)

[0098] After the UE is assigned a random access preamble designated only to itself by the base station as described above, the UE transmits the preamble to the base station.

[0099] (3) Receiving the second message (Step 2)

[0100] After the UE transmits the random access preamble as described in step 1 above, the base station attempts to receive its own random access response within the random access response reception window indicated by the system information or handover command. More specifically, the random access response information may be transmitted in the form of a MAC Packet Data Unit (MAC PDU), and the MAC PDU may be transmitted through a Physical Downlink Shared Channel (PDSCH). In addition, it is preferable that the UE monitor the Physical Downlink Control Channel (PDCCH) so that the UE can properly receive the information transmitted through the PDSCH. That is, the PDCCH preferably includes information on the UE that must receive the PDSCH, frequency and time information of the radio resources of the PDSCH, and a transmission format of the PDSCH. Once the UE successfully receives the PDCCH transmitted to itself, it can properly receive the random access response transmitted through the PDSCH according to the information of the PDCCH. And the random access response may include a random access preamble identifier (ID; for example, RA-RNTI (Random Access Radio Network Temporary Identifier)), an uplink grant (UL Grant) indicating uplink radio resources, a temporary cell identifier (Temporary C-RNTI), and a time synchronization correction value (Timing Advance Command: TAC).

[0101] As described above, the reason why a random access preamble identifier is required in a random access response is because one random access response may include random access response information for one or more UEs, and thus it is necessary to indicate to which UE the UL Grant, temporary C-RNTI, and TAC are valid. In this step, it is assumed that the UE selects a random access preamble identifier that matches the random access preamble it selected in step S402.

[0102] In the CFRA procedure, by receiving random access response information, it is determined that the random access process has been performed normally and the random access process can be terminated.

[0103]

[0104] However, as described above, the CFRA procedure can be performed in limited circumstances, and generally can be performed through the CBRA procedure as illustrated in drawing reference numeral 710 of FIG. 7.

[0105] The process of a UE performing random access with a specific base station according to the CBRA procedure may largely include, as shown in reference numeral 710 of FIG. 7, (1) a step of transmitting a random access preamble by the UE to the base station (hereinafter, a "first message (message 1)" transmission step if there is no confusion), (2) a step of receiving a random access response from the base station in response to the transmitted random access preamble (hereinafter, a "second message (message 2)" reception step if there is no confusion), (3) a step of transmitting an uplink message using information received in the random access response message (hereinafter, a "third message (message 3)" transmission step if there is no confusion), and (4) a step of receiving a message corresponding to the uplink message from the base station (hereinafter, a "fourth message (message 4)" reception step if there is no confusion).

[0106] (1) Sending the first message (Step 1)

[0107] First, the UE can randomly select one random access preamble from a set of random access preambles indicated through system information or a handover command, and select a PRACH (Physical RACH) resource capable of transmitting the random access preamble to transmit it (step 1).

[0108] (2) Receiving the second message (Step 2)

[0109] The method for receiving random access response information is similar to the CFRA procedure described above. That is, after transmitting the random access preamble as in step 1, the UE attempts to receive its own random access response within the random access response reception window indicated by the base station through system information or a handover command, and receives the PDSCH through the corresponding RA-RNTI information (step 2). Through this, an uplink grant (UL Grant), a temporary cell identifier (Temporary C-RNTI), and a time synchronization correction value (Timing Advance Command: TAC) can be received.

[0110] (3) Sending the third message (Step 3)

[0111] When the UE receives a valid random access response, it processes the information contained in the random access response. That is, the UE applies the TAC and stores the temporary C-RNTI. In addition, it transmits data (i.e., the third message) to the base station using the UL grant (step 3). The third message must include the UE identifier. In the CBRA procedure, the base station cannot determine which UEs are performing the random access process, because the UEs must be identified for later collision resolution.

[0112] Two methods have been discussed for including the UE's identifier. In the first method, if the UE already had a valid cell identifier assigned to the cell prior to the random access procedure, the UE transmits its cell identifier via the uplink transmission signal corresponding to the UL grant. On the other hand, if the UE was not assigned a valid cell identifier prior to the random access procedure, the UE transmits its own unique identifier (e.g., S-TMSI or Random Id). Typically, the unique identifier is longer than the cell identifier. If the UE transmits data corresponding to the UL grant, it starts a timer for contention resolution (contention resolution timer).

[0113] (4) Receiving the 4th message (Step 4)

[0114] After the UE transmits data including its own identifier via the UL grant included in the random access response, it waits for instructions from the base station for collision resolution. That is, it attempts to receive the PDCCH to receive a specific message (step 4). Two methods have been discussed for receiving the PDCCH. As mentioned above, if the third message transmitted in response to the UL grant uses its own cell identifier as its identifier, it attempts to receive the PDCCH using its own cell identifier, and if the identifier is a unique identifier, it may attempt to receive the PDCCH using the temporary C-RNTI included in the random access response. In the former case, if the PDCCH is received via its own cell identifier before the collision resolution timer expires, the UE determines that the random access procedure has been performed normally and terminates the random access procedure. In the latter case, if the PDCCH is received via the temporary C-RNTI before the collision resolution timer expires, the UE checks the data transmitted by the PDSCH indicated by the PDCCH. If the content of the above data includes its own unique identifier, the UE determines that the random access process has been performed normally and terminates the random access process.

[0115]

[0116] Meanwhile, drawing reference numeral 810 of FIG. 8 illustrates the concept of a two-stage CBRA that is distinct from the four-stage CBRA described above with reference to drawing reference numeral 710 of FIG. 7.

[0117] This two-step random access is a random access process introduced in Release 16 of NR, and as illustrated in FIG. 8, the message A initially transmitted by the UE to the base station is characterized by being transmitted including the first message and the third message in the four-step random access of reference numeral 710 of FIG. 7 (step A).

[0118] Additionally, in the two-step random access process, the base station may respond to the UE with message B, which is characterized in that it is transmitted including the second message and the fourth message in the four-step random access of the drawing reference numeral 710 of FIG. 7 (step B).

[0119] Additionally, the drawing reference numeral 820 of FIG. 8 illustrates a CFRA procedure based on a two-step random access of the drawing reference numeral 810, which is distinct from the three-step CFRA described above with respect to the drawing reference numeral 720 of FIG. 7.

[0120] In this case, message A is the same as the case of the two-step random access of drawing number 810 of FIG. 8 in that it is transmitted in a combined form of the first message and the third message of CFRA of drawing number 720 of FIG. 7.

[0121]

[0122] In connection with the various random access procedures described above with reference to FIGS. 7 and 8, a method for transmitting information about an SBFD-aware UE to a network with reference to FIG. 6 is specifically described.

[0123]

[0124] 4-step random access procedure

[0125] In the embodiment described above with reference to FIG. 6, transmitting the preamble (S620) and receiving the response message (S630) may correspond to the first message transmission (S610) and the second message reception (S620) of the four-step random access described above in 710 of FIG. 7, respectively. That is, in the four-step random access procedure, SBFD preamble group information may be included in SIB 1 and received, and the UE may select and transmit the first message of the four-step random access to one of the SBFD preamble groups, thereby indicating that it is an SBFD UE.

[0126] At this time, in the four-step random access illustrated in 710 of FIG. 7, the reception of the second message (step 2), the transmission of the third message (step 3), and the reception of the fourth message (step 4) can be performed based on the SBFD time-frequency resource allocation information. That is, the reception of the second message and the fourth message can be performed through the DL subband of the SBFD symbol, and the transmission of the third message can be performed through the UL subband of the SBFD symbol.

[0127] Additionally, if such a 4-step random access is terminated normally, the gNB can know that the UE is an SBFD UE and transmit SBFD-related configuration information to the UE via RRC.

[0128]

[0129] Meanwhile, in another embodiment of the present invention, unlike the embodiment of FIG. 6 in which the UE is notified that the UE is an SBFD UE by setting the SBFD preamble group, a method is proposed in which a MAC (Medium Access Control) CE (Control Element) is newly defined to notify the network that the UE is an SBFD UE.

[0130] Specifically, the MAC CE indicating that the UE is SBFD-aware as described above in the 4-step random access can be transmitted via the PUSCH (Physical Uplink Shared Channel) transmitted via the 3rd message.

[0131] Through this, the network can recognize that the UE is an SBFD UE and transmit SBFD-related configuration information to the UE via RRC.

[0132]

[0133] 2-step random access procedure

[0134] In the embodiment described above with respect to FIG. 6, transmitting the preamble (S620) and receiving the response message (S630) may correspond to transmitting message A (step A) and receiving message B (step B) of the two-step random access described above in 810 of FIG. 8, respectively.

[0135] In this embodiment, settings for the SBFD preamble group can also be assigned to UEs in the initial access process through SIB as system information.

[0136]

[0137] Meanwhile, in a two-step random access procedure, in another embodiment of the present invention, it is possible to newly define a MAC CE and thereby inform the network that the UE is an SBFD UE.

[0138] Specifically, the MAC CE indicating that the UE is SBFD aware, as described above in the second-stage random access, can be transmitted via the PUSCH transmitted via message A.

[0139] Through this, the network can recognize that the UE is an SBFD UE and transmit SBFD-related configuration information to the UE via RRC.

[0140]

[0141] SBFD preamble allocation method

[0142] Specifically, a method for allocating a preamble for an SBFD-aware UE can be set by referring to the structure of a Zadoff-Chu (ZC) sequence used for generating a random access preamble.

[0143] FIG. 9 is a diagram for explaining a method of allocating an SBFD preamble according to one embodiment of the present invention.

[0144] The ZC sequence can be defined as follows:

[0145] [Mathematical Formula 1]

[0146] Xu (n) = exp ((j*u*(pi)*n(n+1)) / N ZC ) for odd Nzc

[0147] Here, n represents the sampling index, Nzc represents the length of the ZC sequence, and u represents the root index of the ZC sequence.

[0148] Such ZC sequences can be transmitted by applying a cyclic shift, and sequences distinguished through distinct cyclic shift values ​​can be referred to as ZCZ (Zero-Correlation Zone) sequences.

[0149] Figure 9 illustrates the concept of root index and values ​​of circular shift as factors that can distinguish ZC sequences from each other.

[0150] That is, if the root index u of mathematical expression 1 has a range of [0, Nt-1] as shown in Fig. 9, it is possible to secure a sequence that is distinguishable from each other by the corresponding root index.

[0151] In addition, even if the ZC sequences have the same root index, it is possible to secure sequences that are distinguished from each other depending on the applied cyclic shift (CS) value, and Fig. 9 illustrates the concept in which the distinguished CS value [0, L-1] is applied.

[0152] In this way, when the random access preamble is transmitted via a ZC sequence, the preamble for the SBFD-aware UE may be set based on one or more of the root index (u) or cyclic shift (CS) values ​​of the ZC sequence, as described in the above-described embodiment.

[0153]

[0154] Of course, in another embodiment of the present invention, a preamble for an SBFD-aware UE may be defined through a sequence other than the ZC sequence, and is not limited to the example of the ZC sequence described above.

[0155] As described above, according to embodiments of the present invention, SBFD-based communication can be efficiently performed by informing the network that the UE is SBFD-aware through a random access process.

[0156] In addition, through this method, not only UEs in the RRC-Connected state, but also UEs operating in the RRC_IDLE or RRC_INACTIVE state can efficiently notify the network that they are SBFD-aware UEs through random access and perform SBFD-based communication.

[0157]

[0158] Figure 10 illustrates a wireless device to which the present technology can be applied.

[0159] Referring to FIG. 10, 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). Here, the first wireless device (100) and the second wireless device (200) can correspond to the UE (610) and the network (620) of FIG. 6, respectively.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166]

[0167] 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.

[0168] 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.

[0169] The SBFD-related UE performance information-based communication according to the embodiments of the present invention as described above is suitable for use in the SBFD-related communication environment of the 5G system in 3GPP, but can also be used in the same manner in 3GPP's 6G and subsequent next-generation mobile communication systems.

Claims

1. In a method for a user equipment (UE) in a mobile communication system to report type 1 UE performance information to a network, Receive random access preamble information related to type 1 UE performance from the above network; Transmitting a preamble selected based on the random access preamble information to the network; and Including receiving a response message to the preamble from the above network, The above first type UE performance information includes full duplex (FD) related information. Method for notifying UE performance information.

2. In paragraph 1, The above FD-related information includes information indicating that the UE is a Sub-Band Full Duplex (SBFD) aware UE. Method for notifying UE performance information.

3. In paragraph 1, Receive a UE performance information request message from the above network; In addition, comprising transmitting second type UE performance information in response to the above UE performance information request message, Method for notifying UE performance information.

4. In paragraph 2, Transmitting the above preamble and receiving the above response message, Corresponds to the first message transmission and the second message reception of the 4-step random access, respectively, The second message is received based on SBFD time-frequency resource allocation information. Method for notifying UE performance information.

5. In paragraph 4, The transmission of the third message and the reception of the fourth message following the reception of the second message are also based on the SBFD time-frequency resource allocation information. The above SBFD time-frequency resource allocation information corresponds to cell-specific information, Method for notifying UE performance information.

6. In paragraph 2, The above random access preamble information is: Contains preamble information for the above SBFD-aware UE, The above SBFD-aware UE preamble information is received through system information. Method for notifying UE performance information.

7. In paragraph 6, The above preamble information for SBFD-aware UE is: Based on one or more of the root indices or cyclic shift values ​​of the Zadoff-Chu sequence, Method for notifying UE performance information.

8. In paragraph 6, The above preamble information for SBFD-aware UE is: Based on the Zadoff-Chu sequence and other sequences, Method for notifying UE performance information.

9. In paragraph 1, Transmitting the above preamble and receiving the above response message, Corresponding to the transmission of message A and reception of message B in the two-step random access, respectively, Method for notifying UE performance information.

10. In paragraph 1, The above UE includes a UE operating in RRC_IDLE mode or RRC_INACTIVE mode. Method for notifying UE performance information.

11. In a method for a user equipment (UE) in a mobile communication system to report type 1 UE performance information to a network, Perform a random access procedure on the above network, Including transmitting a MAC (Medium Access Control) CE (Control Element) that notifies the first type UE performance information through an uplink shared channel transmitted to the network during the random access procedure, The above first type UE performance information includes full duplex (FD) related information. Method for notifying UE performance information.

12. In paragraph 11, The above random access procedure is a 4-step random access, The above MAC CE is, Transmitted via the third message of the above 4-step random access, Method for notifying UE performance information.

13. In paragraph 11, The above random access procedure is a two-step random access, The above MAC CE is, Transmitted via message A of the above two-step random access, Method for notifying UE performance information.

14. In a method for a network to obtain performance information of a first type of user equipment (UE) in a mobile communication system, Transmitting random access preamble information related to type 1 UE performance to multiple UEs within a given cell; Receive a random access preamble from a first UE among the plurality of UEs; Including transmitting a response message to the first UE, depending on whether the random access preamble received from the first UE corresponds to random access preamble information related to the first type UE performance, The above first type UE performance information includes full duplex (FD) related information. Method for obtaining UE performance information.

15. In a method for a network to obtain performance information of a first type of user equipment (UE) in a mobile communication system, Performing a random access procedure with one or more UEs, Including receiving a MAC (Medium Access Control) CE (Control Element) that notifies the first type UE performance information through an uplink shared channel received from the UE during the random access procedure, The above first type UE performance information includes full duplex (FD) related information. Method for obtaining UE performance information.

16. In a mobile communication system, a user equipment (UE) configured to report type 1 UE performance information to a 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 random access preamble information related to type 1 UE performance from the above network; Transmitting a preamble selected based on the random access preamble information to the network; and Including receiving a response message to the preamble from the above network, The above first type UE performance information includes full duplex (FD) related information. User device.

17. In a user equipment (UE) configured to report type 1 UE performance information to a network in a mobile communication system, 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, Perform a random access procedure on the above network, Including transmitting a MAC (Medium Access Control) CE (Control Element) that notifies the first type UE performance information through an uplink shared channel transmitted to the network during the random access procedure, The above first type UE performance information includes full duplex (FD) related information. User device.

18. In a network that operates by acquiring performance information of a first type of user equipment (UE) in a mobile communication system, 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, Transmitting random access preamble information related to type 1 UE performance to multiple UEs within a given cell; Receive a random access preamble from a first UE among the plurality of UEs; Including transmitting a response message to the first UE, depending on whether the random access preamble received from the first UE corresponds to random access preamble information related to the first type UE performance, The above first type UE performance information includes full duplex (FD) related information. network.

19. In a network that operates by acquiring performance information of a first type of user equipment (UE) in a mobile communication system, 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, Performing a random access procedure with one or more UEs, Including receiving a MAC (Medium Access Control) CE (Control Element) that notifies the first type UE performance information through an uplink shared channel received from the UE during the random access procedure, The above first type UE performance information includes full duplex (FD) related information. network.

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