Full duplex-related radio resource allocation and random access of ue

Abstract

This document relates to full duplex-related radio resource allocation and the random access of a UE. To this end, a random access method of a UE comprises: receiving configuration information related to a random access opportunity (RO) from a network, the configuration information related to the RO including first type RO information for normal random access and second type RO information for full duplex (FD)-related random access; and, according to a condition for performing random access, transmitting a first random access preamble through any one or more type of RO among a first type RO according to the first type RO information and a second type RO according to the second type RO information.

Description

Full-duplex related wireless resource allocation and UE's random access

[0001] The following description relates to communication based on full-duplex related wireless resources, specifically to the allocation of FD-related RO (Random Access Opportunity), a random access method for a user device (UE) based thereon, and a device for the same.

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

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

[0004] Referring to FIG. 1, the NG-RAN (Next Generation - Radio Access Network) may include a base station (20) that provides user plane and control plane protocol termination to the UE (10). For example, the base station (20) may include a gNB (next generation-Node B) and / or an eNB (evolved-Node B). For example, the UE (10) may be fixed or mobile and may be referred to by other terms such as terminal, MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), MT (Mobile Terminal), or Wireless Device. For example, the base station may be a fixed station communicating with the UE (10) and may be referred to by other terms such as BTS (Base Transceiver System) or Access Point.

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

[0006]

[0007] Meanwhile, new service types such as XR (Extended Reality), AI-based services, and self-driving cars are emerging in 5G. These services are characterized by dynamic traffic in both DL and UL directions, and require low latency for packet transmission. In 5G services, traffic load can increase explosively to support these various new use cases.

[0008] On the other hand, existing semi-static or dynamic TDD UL / DL configurations may have limitations regarding transmission time delays and interference between operators.

[0009] The existing FDD method may have limitations in terms of efficient frequency resource utilization in the DL / UL direction. 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.

[0010] In order to solve the problem described above, one aspect of the present invention proposes a Sub-Band Full Duplex (SBFD) based communication method applicable to 5G or subsequent next-generation mobile communication systems.

[0011] The technology proposed below is assumed to be applicable not only to current 5G systems but also to 6G and subsequent mobile communication systems; therefore, the term 'SBFD' used in 5G may be referred to by other terms related to FD, and 'base station' may also be referred to by terms other than gNB; however, for the convenience of the explanation below, 5G terminology will be used.

[0012] In one aspect of the present invention, we propose an allocation of SBFD-related RO (Random Access Opportunity), a random access method for a user device (UE) based thereon, and an apparatus for the same.

[0013] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0014] In one aspect of the present invention for solving the problem described above, a method for performing random access is proposed in which a user device (UE) in a mobile communication system performs random access to a network, wherein the method comprises receiving configuration information related to a Random Access Opportunity (RO) from the network, wherein the RO-related configuration information includes a first type RO information for general random access and a second type RO information for full duplex (FD) related random access; and, depending on the condition for performing the random access, transmitting a first random access preamble through one or more types of RO, such as a first type RO according to the first type RO information and a second type RO according to the second type RO information.

[0015] The conditions for performing the above random access may include that the random access is a CFRA (Contention Free Random Access) triggered by a PDCCH (Physical Downlink Control Channel) order, and based on the fact that the random access is a CFRA triggered by a PDCCH order, an indicator representing either the first type RO or the second type RO may be received from the network through the PDCCH order.

[0016] The condition for performing the above random access includes that the random access triggering event is a specific event, and based on the fact that the random access triggering event is the specific event, the first random access preamble can be transmitted through the RO that arrives at the earlier of the first type RO and the second type RO.

[0017] The above specific events may include one or more of beam failure recovery, state transition for SDT (Small Data Transmission) transmission, scheduling request failure, or synchronization reset.

[0018] Based on the fact that the above random access triggering event is the above specific event, the first random access preamble can be transmitted through the RO that arrives at an earlier time, regardless of the type between the first type RO and the second type RO.

[0019] Based on the fact that the above random access triggering event is not the above specific event, the first random access preamble can be transmitted through the RO of either the first type RO and the second type RO.

[0020] Based on the failure to transmit the first random access preamble, the second random access preamble is transmitted, wherein the random access triggering event is the specific event and the random access configuration method is based on configuring the first type RO information and the second type RO information into one random access configuration information, the second random access preamble can also be transmitted through the RO that arrives at the earlier of the first type RO and the second type RO.

[0021] Based on the fact that the above random access triggering event is not the above specific event and the above random access configuration method is configured with the above first type RO information and the above second type RO information as separate random access configuration information, the above second random access preamble can be transmitted through the RO of the type used for transmitting the above first random access preamble among the above first type RO and the above second type RO.

[0022] The conditions for performing the above random access may include using a specific random access preamble format, and if the random access triggering event is a short preamble format, the first random access preamble is transmitted through the first type RO; and if the random access triggering event is a long preamble format, the first random access preamble can be transmitted through the second type RO.

[0023] The conditions for performing the above random access may include the strength of a received signal from the network being smaller than a predetermined standard, and when the strength of the received signal is smaller than the predetermined standard, the first random access preamble is transmitted through the first type RO; and when the strength of the received signal is greater than or equal to the predetermined standard, the first random access preamble can be transmitted through the second type RO.

[0024] Based on the failure to transmit the first random access preamble, a second random access preamble is transmitted, wherein the second random access preamble may be determined differently as to whether it uses an RO of the same type as the RO used in transmitting the first random access preamble, depending on whether the random access configuration method configures the first type RO information and the second type RO information as one random access configuration information or whether the random access configuration method configures the first type RO information and the second type RO information as separate random access configuration information.

[0025] Based on the above random access configuration method configuring the first type RO information and the second type RO information into a single random access configuration information, when the first random access preamble is transmitted through the second type RO, the second random access preamble can be transmitted through a selected RO regardless of the type of the first type RO and the second type RO.

[0026] Based on the above random access configuration method configuring the first type RO information and the second type RO information into one random access configuration information, when the first random access preamble is transmitted through the first type RO, the second random access preamble can be transmitted through the first type RO.

[0027] Based on the failure to transmit the second random access preamble, a third random access preamble is transmitted, wherein the third random access preamble can be transmitted through a selected RO regardless of the type of the first type RO and the second type RO.

[0028] Based on the above random access configuration method being configured such that the first type RO information and the second type RO information are separate random access configuration information, when the first random access preamble is transmitted through the second type RO, the second random access preamble can be transmitted through the second type RO.

[0029] Based on the above random access configuration method configuring the first type RO information and the second type RO information into a single random access configuration information, the preamble received target power of the random access can be set separately for the first type RO and the second type RO.

[0030] At this time, the maximum number of retransmissions (preambleTransMax) and power ramping step of the above random access can be set commonly regardless of the RO type.

[0031] When attempting to retransmit a preamble in the above random access, it may be configured so that retransmission using the first type RO is possible after a failure in transmitting a random access preamble using the second type RO, and retransmission using the second type RO is not possible after a failure in transmitting a random access preamble using the first type RO.

[0032] Here, the above FD-related random access can correspond to random access using SBFD (Sub-Band Full Duplex) symbols.

[0033] Meanwhile, in another aspect of the present invention for solving the problem described above, a random access assistance method is proposed, wherein a network in a mobile communication system assists random access of a user device (UE), the method comprises transmitting Random Access Opportunity (RO) related configuration information to the UE, wherein the RO related configuration information includes a first type RO information for general random access and a second type RO information for full duplex (FD) related random access; and, depending on the condition for performing the random access, receiving a first random access preamble through one or more types of RO, such as a first type RO according to the first type RO information and a second type RO according to the second type RO information.

[0034] In addition, in another aspect of the present invention, a user device (UE) performing random access to a network in a mobile communication system is proposed, comprising: at least one processor; and at least one memory that can be operably connected to the at least one processor and stores instructions that cause the at least one processor to perform operations when executed, wherein the operations include receiving Random Access Opportunity (RO) related configuration information from a network, wherein the RO related configuration information includes a first type RO information for general random access and a second type RO information for full duplex (FD) related random access; and, depending on the condition for performing the random access, transmitting a first random access preamble through one or more types of RO, such as a first type RO according to the first type RO information and a second type RO according to the second type RO information.

[0035] In addition, another aspect of the present invention proposes a network that assists random access of a user device (UE) in a mobile communication system, comprising: at least one processor; and at least one memory that can be operably connected to the at least one processor and stores instructions that, when executed, cause the at least one processor to perform operations, wherein the operations include transmitting Random Access Opportunity (RO) related configuration information to the UE, wherein the RO related configuration information includes a first type RO information for general random access and a second type RO information for full duplex (FD) related random access; and, depending on the conditions for performing the random access, receiving a first random access preamble through one or more types of RO, such as a first type RO according to the first type RO information and a second type RO according to the second type RO information.

[0036] According to the embodiments of the present invention as described above, by determining the RO type according to the conditions of RA and performing RA, RA suitable for the situation can be performed.

[0037] Specifically, according to one embodiment of the present invention, when the RA triggering condition corresponds to a specific event, the delay of the RA can be minimized by using an RA that arrives quickly regardless of the RA type.

[0038] In addition, according to one embodiment of the present invention, when the strength of the received signal is below a predetermined standard, the RA success rate can be increased by setting the first type RO to be used.

[0039] In addition, according to one embodiment of the present invention, when retrying RA, the relationship with the initial transmission and the change of RO type can be controlled to maximize the complexity and resource efficiency of the system.

[0040] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description below.

[0041] Figure 1 shows the structure of a system for 5G communication.

[0042] Figure 2 is a diagram illustrating how to perform FD operation in 5G.

[0043] Figures 3 and 4 are diagrams for explaining the comparison between SBFD and SSFD during FD operation in 5G.

[0044] FIG. 5 is a diagram illustrating a method for a UE to perform random access to a network according to an embodiment of the present invention.

[0045] FIGS. 6 and 7 are drawings for explaining the RA configuration method applied to embodiments of the present invention and the RA method of the UE according to the same.

[0046] FIG. 8 is a diagram illustrating the consideration of an RA preamble format as an RA condition in one embodiment of the present invention.

[0047] FIG. 9 is a diagram illustrating the consideration of the received signal strength as an RA condition in one embodiment of the present invention.

[0048] FIGS. 10 and FIGS. 11 are drawings for explaining the operation of a UE in accordance with RA configuration method option 1 according to an embodiment of the present invention.

[0049] FIGS. 12 and FIGS. 13 are drawings for explaining the operation of a UE in accordance with RA configuration method option 2 according to an embodiment of the present invention.

[0050] FIGS. 14 and 15 are drawings illustrating a case in which a change to a second type RO is not allowed when retrying RA according to an embodiment of the present invention.

[0051] FIGS. 16 and 17 are drawings illustrating methods for controlling RO type change during RA retry according to other embodiments of the present invention.

[0052] Figures 18 and 19 are drawings for specifically explaining the procedures of CBRA and CFRA and each message.

[0053] FIG. 20 illustrates a wireless device that can be applied to the present technology.

[0054] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0055] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0056]

[0057] As described above, one aspect of the present invention proposes the allocation of a Random Access Opportunity (RO) related to SBFD, a random access method for a User Equipment (UE) based thereon, and an apparatus for such an allocation. To this end, the FD method currently being discussed in 5G will first be explained in detail.

[0058] Figure 2 is a diagram illustrating how to perform FD operation in 5G.

[0059] Referring to FIG. 2, the method of applying FD operation in the intra-carrier is illustrated. Specifically, the FD operation may be considered as the SBFD (Sub-Band Full Duplex) method illustrated in FIG. 2 (a) and the SSFD (Spectrum-Sharing Full Duplex) method illustrated in FIG. 2 (b).

[0060] In the case of SBFD, transmission and reception between 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 between DL and UL are performed using the same frequency resource 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.

[0061] In the case of SBFD, considering the non-overlapping features that distinguish it from SSFD, it may be referred to as 'Subband-Wise Full Duplex' or 'Subband non-overlapping Full Duplex'.

[0062]

[0063] Figures 3 and 4 are diagrams for explaining the comparison between SBFD and SSFD during FD operation in 5G.

[0064] First, SBFD can be considered in FIG. 3 (a) and FIG. 4 (a). Specifically, referring to FIG. 3 (a), the sub-band area of ​​DL and the sub-band area of ​​UL may not overlap each other. In this case, a guard band may exist between the sub-band area of ​​DL and the sub-band area of ​​UL. Alternatively, referring to FIG. 2 (a), SBFD operation may be performed based on the resource pattern of a cell or base station. For example, in the resource pattern, the HD (half-duplex) slot / symbol and the SBFD slot / symbol may be TDMed together.

[0065] Alternatively, examples such as those shown in FIG. 3 (b) and FIG. 4 (b) may be considered for SSFD. Specifically, referring to FIG. 3 (b), the sub-band area of ​​DL and the sub-band area of ​​UL may overlap each other. Alternatively, referring to FIG. 4 (b), SSFD operation may be performed based on the resource pattern of a cell or base station. For example, in the resource pattern, the HD (half-duplex) slot / symbol and the SSFD slot / symbol may be TDMed together.

[0066]

[0067] 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 may be used for FD operations. On the time resources where FD operations are performed, SBFD or SSFD operations may be performed.

[0068] In the case of the FD operation described above, the FD operation can be performed from both the perspective of the gNB and the perspective of the UE. For example, both the gNB and the UE may simultaneously perform DL / UL transmission and reception using the same or different frequency resources within the same time resource. Alternatively, only the gNB may perform the FD operation (within the same time resource), while the UE may perform the HD operation. The gNB may simultaneously perform DL and UL transmission and reception using the same or different frequency resources within the same time resource, but the UE may only perform DL reception or UL transmission within a specific time resource. In this case, the gNB may perform an FD operation in a manner that performs DL transmission and UL reception for different UEs at the same time point (or within the same time resource).

[0069] As described above, in a situation where a network such as a gNB performs FD operations, whether a UE can perform FD operations may be related to the performance of the UE. In this way, if a UE is aware of and capable of performing the network's FD operations, that UE may be referred to as an 'FD-aware UE'.

[0070] 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 at the sub-band level, and thus has the advantage of being able to operate flexibly from the perspective of operation of not only UEs aware of SBFD but also legacy UEs unaware of the SBFD situation.

[0071]

[0072] Below, against this background, the allocation of ROs (Random Access Opportunities) related to SBFD and the resulting random access method for UEs are explained in detail.

[0073] FIG. 5 is a diagram illustrating a method for a UE to perform random access to a network according to an embodiment of the present invention.

[0074] In the following description, it is assumed that 'SBFD-aware UE' refers to a UE that can utilize the network's SBFD-related resource allocation information.

[0075] Meanwhile, when an SBFD-aware UE in the RRC_IDLE or RRC_INACTIVE state attempts to transition to the RRC_CONNECTED state, the UE may attempt random access to the network. In the following description, it is assumed that for random access by a UE in the RRC_CONNECTED state, (1) a single RACH configuration may be used and configured so that the SBFD-aware UE can utilize the RO within the uplink subband of the SBFD symbol (hereinafter referred to as "Option 1"), or (2) two separate RACH configurations may be used, wherein the first type RO information represents the existing general RACH configuration and the second type RO information represents the RACH configuration for SBFD-related random access (hereinafter referred to as "Option 2").

[0076] In addition, the following description assumes that the RO configuration information for the UE in the RRC_CONNECTED state described above can also be utilized by the SBFD-identified UE in the RRC_IDLE or RRC_INACTIVE state.

[0077] With this background, referring to FIG. 5, a UE according to one embodiment of the present invention receives RO-related configuration information from a network (S510), wherein the RO-related configuration information may include a first type RO information for general random access and a second type RO information for FD-related random access.

[0078] Subsequently, the UE according to the present embodiment may transmit a random access preamble through ROs of different types by considering conditions for performing random access (RA) (S520). For example, if the first condition is satisfied, the UE may transmit a random access preamble through a first type RO according to the first type RO information (S530). Alternatively, if the second condition is satisfied, the UE may transmit a random access preamble through a second type RO according to the second type RO information (S540).

[0079] In the following description, the preamble transmitted for RA may be referred to as the 'first random access preamble' in contrast to the random access preamble transmitted at the time of initial access and the random access preamble retransmitted.

[0080]

[0081] Random access triggering event-based

[0082] In one embodiment of the present invention, as a 'condition for performing random access' in the embodiment of FIG. 5 described above, it is proposed to determine the RO type based on whether the random access triggering event is a specific event.

[0083] For example, the conditions for performing random access may include that the random access is a Contention-Free Random Access (CFRA) triggered by a Physical Downlink Control Channel (PDCCH) order. In such a case where the random access is a CFRA triggered by a PDCCH order, a UE according to one embodiment of the present invention proposes receiving an indicator (e.g., a 1-bit indicator) indicating either a first type RO or a second type RO from a network via the PDCCH order, and the UE can select an RO type according to the received indicator and transmit a random access preamble.

[0084]

[0085] As another example, one or more events such as Beam Failure Recovery, state transition for SDT (Small Data Transmission) transmission, scheduling request failure, or synchronization reset may be considered as specific events. When an RA is triggered by such specific events, a UE according to one embodiment of the present invention proposes transmitting a first random access preamble through the RO that arrives at the earlier of a first type RO and a second type RO.

[0086] That is, for a specific event such as the example described above, which is an RA triggering event requiring a fast RA of the UE, it may be advantageous to transmit the first random access preamble through the RO that arrives earlier, regardless of the type between the first type RO and the second type RO.

[0087] In addition, in one embodiment of the present invention, the second random access preamble, which is retransmitted when the transmission of the first random access preamble fails, can also be transmitted through the RO that arrives earlier among the first type RO and the second type RO, regardless of type.

[0088]

[0089] However, if the RA triggering event is not the specific event mentioned above, the UE may transmit the first / second random access preamble through either the first type RO or the second type RO, which will be specifically explained by the following embodiments.

[0090]

[0091] RA configuration method

[0092] FIGS. 6 and 7 are drawings for explaining the RA configuration method applied to embodiments of the present invention and the RA method of the UE according to the same.

[0093] In FIGS. 6 and 7, the first type RO is referred to as 'legacy RO' in that it is RO information for existing random access. Additionally, the second type RO information is referred to as 'additional RO' as RO information additionally assigned to the first type RO information.

[0094] First, FIG. 6 illustrates a case where the RA configuration method comprises the first type RO information and the second type RO information as a single RA configuration information, and FIG. 7 illustrates a case where the RA configuration method comprises the first type RO information and the second type RO information as separate RA configuration information.

[0095] For convenience of explanation, these RA configuration methods may be sequentially referred to as 'Option 1 (Fig. 6)', 'Option 2 (Fig. 7)', and so on.

[0096] In Fig. 6, according to the RA configuration option 1 method, the position of RO is an example of setting ROs according to the positions of different symbols at the same frequency position within the SBFD UL subband, and RO can be set according to various time frequency positions.

[0097] In addition, in FIG. 7, the position of the second type RO according to the second type RA configuration method according to RA configuration option 2 is located within the SBFD UL subband, and is an example of a setting according to the position of different symbols at a different frequency position from the first type RO, and RO settings according to various time frequency positions are possible.

[0098]

[0099] Under this premise, in one embodiment of the present invention, in the case of the method of RA configuration option 1 as shown in FIG. 6, it is set for a specific RA triggering event as described above, and can be operated so that RA can be (re)executed using the RO at an earlier point in time regardless of the RO type at an earlier point in time.

[0100] In addition, in one embodiment of the present invention, in the case of the method of RA configuration option 2 as shown in FIG. 7, for RAs other than the specific RA triggering event described above, the RA may be re-executed using the RO type used for transmitting the initial RA preamble (first RA preamble).

[0101] The settings for specific triggering events as described above can be set by upper-layer signaling such as RRC (Radio Resource Control) or MAC-CE (Medium Access Control - Control Element).

[0102]

[0103] RA Preamble Format

[0104] FIG. 8 is a diagram illustrating the consideration of an RA preamble format as an RA condition in one embodiment of the present invention.

[0105] Specifically, the table designated by reference numeral 810 is the length of the RA preamble (L RA ) is 839, and the subcarrier spacing of the RA preamble (△f R It indicates the RA preamble format when ) is {1.25, 5} kHz. Also, the table designated by reference numeral 820 shows the length of the RA preamble (L RA ) is any one of {139, 571, 1151}, and the subcarrier spacing (△f) of the RA preamble R ) is 15*2 u Represents the RA preamble format in the case of kHz.

[0106] In one embodiment of the present invention, it is proposed that a specific RO type be used depending on the length or format of the preamble to be used in the RA by the UE, such that in the case of a short preamble format below a predetermined threshold, the RA is performed using a second type RO, and in the case of a long preamble format, the RA is performed using a first type RO. This assumes that since the first type RO may have more resource capacity compared to the second type RO, the first type RO is selected and transmitted preferentially in the case of a long preamble format transmission.

[0107] However, the above logic is based on the assumption that the first type RO is configured to have more resources than the second type RO; if the resource situation is configured in the opposite way, the second type RO may be configured to be used when using the long preamble format.

[0108] In addition, the method according to the above-described embodiment may be applied only to the selection of the RO type during the initial RA execution, or may be applied only during the RA retry, or may be applied and operated during all RA attempts.

[0109]

[0110] Received signal strength

[0111] FIG. 9 is a diagram illustrating the consideration of the received signal strength as an RA condition in one embodiment of the present invention.

[0112] According to the embodiment illustrated in FIG. 9, the UE measures the strength of a received signal from a network (e.g., RSRP) (S910), and if the received signal strength is smaller than a predetermined standard (S920), performs RA using a first type RO (S930), and if it is larger, performs RA using a second type RO (S940).

[0113] Specifically, the second type RO may have limitations on power ramping compared to the first type RO due to Cross Link Interference (CLI) issues. Additionally, since path loss is large when RSRP is small, it can be considered that there is a high possibility of power ramping during RA. Therefore, in one embodiment of the present invention, it is proposed that when RSRP is small, the UE uses the first type RO to perform efficient RA.

[0114] The method according to the above-described embodiment may be applied only to the selection of the RO type during the initial RA execution, or may be applied only during the RA retry, or may be applied and operated during all RA attempts.

[0115] In addition, for both RA setting option 1 and option 2, the threshold parameter for the repetition of the first message (Msg1) of the RA is set separately for the first type RO and the second type RO, and the repetition factor (msg1-RepetitionNum) is set separately for option 2 and is set commonly for option 1.

[0116]

[0117] RO type when retransmitting preamble

[0118] Below, we will examine in detail the RO types used in the case of RA preamble retransmission.

[0119] In one embodiment of the present invention, when transmitting a second random access preamble based on a failure to transmit a first random access preamble, it is proposed to determine differently whether to use the same type as the first RA preamble for the second RA preamble depending on whether the RA configuration method described above in relation to FIG. 6 and FIG. 7 follows RA configuration method option 1 ( FIG. 6) or RA configuration method option 2 ( FIG. 7).

[0120]

[0121] FIGS. 10 and FIGS. 11 are drawings for explaining the operation of a UE in accordance with RA configuration method option 1 according to an embodiment of the present invention.

[0122] As illustrated in FIGS. 10 and 11, the UE can receive RA configuration information according to RA configuration option 1 from a network (e.g., gNB) (S1010, S1110).

[0123] As shown in FIG. 6, when there is a second type RO and a first type RO after the RA triggering point, the UE according to one embodiment of the present invention can be operated in a manner such that, as shown in FIG. 10, after the triggering point, if the first RA attempt is a second type RO (S1020), then when retrying thereafter, the RA retry is performed according to the order in which the ROs are located (S1030, S1040, S1050).

[0124] The determination of the RO type used during the first RA attempt may be based on the time sequence, or it may be determined as a specific RO type by the specific settings and conditions described above in relation to FIGS. 5 to 9.

[0125]

[0126] Meanwhile, as shown in FIG. 11, when the first RA attempt after the triggering point is set to the first type RO, the UE does not perform RA in the first second type RO (S1120), and after performing an RA attempt in the first first type RO (S1130), when retrying, it performs a retry of RA according to the order in which the ROs are located (S1140, S1150).

[0127]

[0128] FIGS. 12 and FIGS. 13 are drawings for explaining the operation of a UE in accordance with RA configuration method option 2 according to an embodiment of the present invention.

[0129] As illustrated in FIGS. 12 and 13, the UE can receive RA configuration information according to RA configuration option 2 from a network (e.g., gNB) (S1210, S1310).

[0130] As shown in FIG. 12, if the first RA attempt after the triggering point is a Type 2 RO (S1220), the UE can be operated in a manner that performs a retry of the RA using only the Type 2 RO during subsequent retries. Specifically, FIG. 10 illustrates an example in which an RA attempt is not performed in the two Type 1 ROs provided after the initial RA attempt (S1230, S1240), and a second RA preamble is transmitted in the subsequent Type 2 RO (S1250).

[0131] In this embodiment as well, the determination of the RO type used during the first RA attempt may be based on the timing order, or it may be a specific RO type based on specific settings and conditions according to the embodiments described above in relation to FIGS. 5 to 9.

[0132] Meanwhile, as shown in FIG. 13, if the first RA attempt after the triggering point is a first type RO, the UE does not perform RA on the first second type RO (S1320), and after performing an RA attempt on the first first type RO (S1330), when retrying, it can be operated in a form where it performs a retry of RA only on the first type RO (S1340, S1350).

[0133]

[0134] RO Type and RA Power Control Parameters

[0135] Meanwhile, in one embodiment of the present invention, in the case of setting RA configuration option 1, the following operation method for parameters related to PRACH power control during RA retry can be applied to the first type RO and the second type RO.

[0136] Preferably, in one embodiment of the present invention, it is proposed that the PreambleReceivedTargetPower of random access be set separately for the first type RO and the second type RO. Since the PreambleReceivedTargetPower of random access represents the target value of the preamble received power in terms of the network, it may be efficient to set it by considering the RO type.

[0137] In contrast, it is proposed that the maximum number of retransmissions (preambleTransMax) and the power ramping step for random access be set commonly regardless of the RO type. That is, the maximum number of retransmissions can be set to the total number of retransmissions regardless of the RO type.

[0138]

[0139] However, in contrast to this, the power ramping step may be operated by setting and applying an offset value of the power ramping value applied in the second type RO compared to the first type RO. That is, the size of the power ramping during retransmission for each RO type can be applied differently and operated.

[0140] In this embodiment, when the UE changes the RO type as described below during retransmission, it may apply the above-described offset value while increasing the power ramping counter to compensate for the power ramping difference, particularly for RA configuration option 2, or reset the power ramping.

[0141] Additionally, for RA configurations 1 and 2, when the preamble is repeatedly transmitted through the first type RO and the second type RO, separate rsrp-ThresholdMsg1-RepetitionNum2 / 4 / 8 and msg1-RepetitionNum may be supported.

[0142] In addition, the maximum number of retransmissions can be set for each RO type, and it can also be operated to attempt the maximum number of retransmissions for a specific RO type and declare an RA failure if it fails.

[0143] The above parameter settings can be operated in combination.

[0144]

[0145] Change type upon RA retry

[0146] Meanwhile, in one embodiment of the present invention, RA retry operation is proposed in the following manner to efficiently manage power ramping values ​​and the maximum number of preamble retransmissions during RA retry by restricting changes to the RO type during RA retry.

[0147] FIGS. 14 and 15 are drawings illustrating a case in which a change to a second type RO is not allowed when retrying RA according to an embodiment of the present invention.

[0148] In FIGS. 14 and 15, the UE can receive RA configuration information from the network (S1410, S1510), thereby obtaining first type RO and second type RO information.

[0149] Under this assumption, in this embodiment, when retrying RA, it is possible to retry changing from the second type RO to the first type RO, but it is not possible to retry changing from the first type RO to the second type RO. In the RO allocation situation of FIG. 6 or FIG. 7, if the first RA attempt is performed on the second type RO (S1420) as in FIG. 14, and then the retry is performed using the first type RO (S1430), it is possible to retry on the first type RO (S1440) after that point in time, but not retry on the second type RO (S1450).

[0150] In addition, as shown in FIG. 15, if the UE performs the first RA attempt in the first type RO, subsequent RA retries can be operated to be performed only in the first type RO (S1520, S1530, S1540, S1550).

[0151] Through this embodiment, since the amount of resources in the first type RO is greater than that of the second type RO, the retry can be guided to the first type RO, thereby ensuring the effect of minimizing conflicts between UEs.

[0152]

[0153] FIGS. 16 and 17 are drawings illustrating methods for controlling RO type change during RA retry according to other embodiments of the present invention.

[0154] Referring to FIG. 16, FIG. 16 proposes an embodiment in which, contrary to the embodiments of FIG. 14 and FIG. 15, a retry attempt to change from a first type RO to a second type RO is possible during an RA retry, but a retry attempt to change from a second type RO to a first type RO is not possible.

[0155] As shown in FIG. 16, after the first RA attempt is performed in the first type RO, the retry can be performed in either the first type RO or the second type RO, and after the retry (S1650) is performed in the second type RO, the operation can be operated so that RA can be performed only in the second type RO. Specifically, FIG. 16 illustrates that if the retry is not performed in the second type RO (S1620), and the retry is performed through the first type RO (S1630, S1640), and then the process is switched to the second type RO and the retry is performed through the second type RO for the first time (S1650), then the retry is not performed again in the first type RO (S1660).

[0156] Meanwhile, as shown in FIG. 17, if the UE performs the first RA attempt in the second type RO (S1720), it may be operated so that the retry is not performed in the first type RO thereafter (S1730, S1740), and the RA retry is performed only in the second type RO (S1750).

[0157]

[0158] Meanwhile, in another embodiment of the present invention, when retrying an RA, only one change of RO type is allowed, and thereafter, only the same RO type can be used. That is, if the first RO type is a second type RO, the RA retry after the RA that used the first type RO can be operated to use only the first type RO. Conversely, if the first RO type is a first type RO, the RA retry after the RA that used the second type RO can be operated to use only the second type RO.

[0159] This method can have the effect of reducing the complexity of power control operations resulting from frequent RO type changes.

[0160]

[0161] Random access type

[0162] Figures 18 and 19 are drawings for specifically explaining the procedures of CBRA and CFRA and each message.

[0163] FIGS. 18 and 19 respectively illustrate the concepts of contention-based random access (CBRA) (710, 810) and contention-free random access (CFRA) (720, 820) in the process of performing random access between a typical UE and a base station (gNB) in LTE and NR.

[0164] First, there are the following cases where a UE performs random access.

[0165] - When the UE performs initial access because it does not have an RRC connection with the base station

[0166] - When the UE first connects to the target cell during the handover process

[0167] - When a random access process is requested by a command from the base station

[0168] - When data to be transmitted over the uplink occurs in a situation where the uplink time synchronization is incorrect or the designated radio resource used to request the radio resource has not been allocated

[0169] - When performing a recovery process in the event of a radio link failure or handover failure

[0170]

[0171] LTE and NR systems provide both a CBRA procedure, in which a UE randomly selects and uses a preamble from a specific set during the process of selecting a random access preamble, and a CFRA procedure, in which a base station uses a random access preamble assigned only to a specific UE. However, the CFRA procedure could be used only when requested by the aforementioned handover process or by a command from a base station.

[0172] Referring to reference numeral 720 in FIG. 18, the CFRA procedure can be performed as follows.

[0173] (1) Random access preamble allocation (step 0)

[0174] As described above, the CFRA procedure can be performed in (1) the case of a handover process, and (2) when requested by a command from a base station. Of course, the CFRA procedure may also be performed in both of the above cases.

[0175] First, for the CFRA procedure, it is important to receive a designated random access preamble from the base station that is free from the possibility of collision. Methods for receiving the said random access preamble include through a handover command and through a PDCCH command. Through this, the UE is assigned a random access preamble.

[0176] (2) Transmission of the first message (Step 1)

[0177] As described above, after the UE is assigned a random access preamble designated only to itself to the base station, it transmits the said preamble to the base station.

[0178] (3) Receive second message (Step 2)

[0179] After transmitting a random access preamble as described in Step 1 above, the UE attempts to receive its own random access response within a random access response reception window indicated by the base station through system information or a 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 via a Physical Downlink Shared Channel (PDSCH). Furthermore, it is desirable for the UE to monitor a Physical Downlink Control Channel (PDCCH) in order to properly receive the information transmitted via the PDSCH. That is, it is desirable for the PDCCH to contain information about the UE that needs to receive the PDSCH, frequency and time information of the radio resources of the PDSCH, and the transmission format of the PDSCH. Once the UE succeeds in receiving the PDCCH transmitted to it, it can properly receive the random access response transmitted via the PDSCH according to the information in the PDCCH. And the above random access response may include a random access preamble identifier (ID; e.g., RA-RNTI (Random Access Radio Network Temporary Identifier)), an uplink grant (UL Grant) indicating an uplink radio resource, a temporary cell identifier (Temporary C-RNTI), and a timing advance command (TAC).

[0180] As mentioned above, the reason a random access preamble identifier is required in a random access response is that, since a single random access response may contain random access response information for one or more UEs, it is necessary to indicate which UE is valid for the aforementioned uplink grant (UL Grant), temporary C-RNTI, and TAC.

[0181] In the CFRA procedure, by receiving random access response information, it is determined that the random access process has been successfully performed and the random access process can be terminated.

[0182]

[0183] However, as described above, the CFRA procedure may be performed in limited situations, and generally, it may be performed through the CBRA procedure as shown in reference numeral 710 of FIG. 18.

[0184] The process of a UE performing random access with a specific base station according to the CBRA procedure may largely include (1) a step in which the UE transmits a random access preamble to a base station (hereinafter, a step of transmitting a "first message (message 1)" if there is no confusion), (2) a step of receiving a random access response from a base station in response to the transmitted random access preamble (hereinafter, a step of receiving a "second message (message 2)" if there is no confusion), (3) a step of transmitting an uplink message using the information received from the random access response message (hereinafter, a step of transmitting a "third message (message 3)" if there is no confusion), and (4) a step of receiving a message corresponding to the uplink message from a base station (hereinafter, a step of receiving a "fourth message (message 4)" if there is no confusion).

[0185] (1) Transmit the first message (Step 1)

[0186] First, the UE can randomly select one random access preamble from a set of random access preambles indicated by system information or a handover command, and select and transmit a PRACH (Physical RACH) resource capable of transmitting the random access preamble (step 1).

[0187] (2) Receive the second message (Step 2)

[0188] The method of receiving random access response information is similar to the CFRA procedure described above. That is, after the UE transmits the random access preamble as in step 1 above, it 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, it can receive the uplink grant (UL Grant), temporary cell identifier (Temporary C-RNTI), and time synchronization correction value (Timing Advance Command: TAC), etc.

[0189] (3) Transmit the third message (Step 3)

[0190] When a 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. Additionally, using the UL acknowledgment, it transmits data (i.e., the third message) to the base station (step 3). The third message must include the UE's identifier. In the CBRA procedure, the base station cannot determine which UEs are performing the random access process, because the UE must be identified in order to resolve the collision later.

[0191] Two methods for including the UE's identifier were discussed. In the first method, if the UE already possessed a valid cell identifier assigned to the cell prior to the random access process, the UE transmits its cell identifier via the uplink transmission signal corresponding to the UL acknowledgment. On the other hand, if the UE did not receive a valid cell identifier prior to the random access process, the UE transmits its unique identifier (e.g., S-TMSI or Random ID). Generally, the unique identifier is longer than the cell identifier. Once the UE has transmitted the data corresponding to the UL acknowledgment, it initiates a contention resolution timer.

[0192] (4) Receive the 4th message (Step 4)

[0193] After the UE transmits data containing its identifier via the UL acknowledgment 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 for receiving the PDCCH have also been discussed. As mentioned above, if the third message transmitted in response to the UL acknowledgment uses the cell identifier as its identifier, the UE attempts to receive the PDCCH using its cell identifier; if the identifier is a unique identifier, the UE may attempt to receive the PDCCH using the temporary C-RNTI included in the random access response. Subsequently, in the former case, if the UE receives the PDCCH using its cell identifier before the collision resolution timer expires, the UE determines that the random access process has been performed normally and terminates the random access process. In the latter case, if the UE receives the PDCCH via the temporary C-RNTI before the collision resolution timer expires, it checks the data transmitted by the PDCCH as instructed by the PDCCH. If the content of the above data includes its own unique identifier, the UE determines that the random access process was performed successfully and terminates the random access process.

[0194]

[0195] Meanwhile, reference numeral 810 in FIG. 19 illustrates the concept of a 2-stage CBRA that is distinct from the 4-stage CBRA described above in relation to reference numeral 710 in FIG. 18.

[0196] This two-stage random access is a random access process introduced in Release 16 of NR, and is characterized in that message A, which the UE initially transmits to the base station as shown in FIG. 19, includes the first message and the third message in the four-stage random access of reference numeral 710 in FIG. 18 (step A).

[0197] Additionally, during the second stage random access process, the base station may respond to the UE with message B, which is characterized by being transmitted including the second message and the fourth message in the fourth stage random access of reference numeral 710 of FIG. 18 (step B).

[0198] In addition, reference numeral 820 of FIG. 19 illustrates a CFRA procedure based on the two-stage random access of reference numeral 810, which is distinguished from the three-stage CFRA described above in relation to reference numeral 720 of FIG. 18.

[0199] In this case, message A is the same as the case of the two-stage random access of reference numeral 810 in FIG. 19 in that it is transmitted in a combined form of the first message and the third message of CFRA in reference numeral 720 in FIG. 18.

[0200]

[0201] Device configuration

[0202] FIG. 20 illustrates a wireless device that can be applied to the present technology.

[0203] Referring to FIG. 20, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through 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 and network of FIG. 5, respectively.

[0204] The first wireless device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memory (104) and / or transceivers (106) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or flowcharts of operation disclosed in this document. For example, the processor (102) may process information within the memory (104) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (106). Additionally, the processor (102) may receive a wireless signal containing a second information / signal through the transceiver (106) and then store information obtained from the signal processing of the second information / signal in the memory (104). Memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, memory (104) may store software code containing instructions for performing some or all of the processes controlled by the processor (102) or for performing the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in this document. Here, the processor (102) and memory (104) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE E-UTRA, 5G NR). A transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals through one or more antennas (108). The transceiver (106) may include a transmitter and / or receiver. The transceiver (106) may be combined with an RF (Radio Frequency) unit. In the present invention, the wireless device may refer to a communication modem / circuit / chip.

[0205] The second wireless device (200) includes one or more processors (202) and one or more memories (204), and may additionally include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memory (204) and / or transceivers (206) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or operation sequences disclosed in this document. For example, the processor (202) may process information within the memory (204) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a fourth information / signal through the transceiver (206) and then store information obtained from the signal processing of the fourth information / signal 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 containing instructions 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 sequence diagrams disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement 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 through one or more antennas (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be used in combination with an RF unit. In the present invention, the wireless device may refer to a communication modem / circuit / chip.

[0206] Hereinafter, 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 Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation 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 flowcharts of operation disclosed in this document. One or more processors (102, 202) may generate a signal (e.g., baseband signal) containing a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document and provide it to one or more transceivers (106, 206). One or more processors (102, 202) may receive a signal (e.g., baseband signal) from one or more transceivers (106, 206) and may obtain a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this document.

[0207] One or more processors (102, 202) may be referred to as a controller, microcontroller, microprocessor, or 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 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. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be contained in one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0208] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories (104, 204) may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. One or more memories (104, 204) may be located inside and / or outside of one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) through various technologies such as wired or wireless connections.

[0209] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc., of this document to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts, etc., disclosed in this document from one or more other devices. For example, one or more transceivers (106, 206) may be connected to one or more processors (102, 202) and may transmit and receive wireless signals. For example, one or more processors (102, 202) may 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 connected 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, etc., as described in the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this document through 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 the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (102, 202).One or more transceivers (106, 206) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. To this end, one or more transceivers (106, 206) may include (analog) oscillators and / or filters.

[0210]

[0211] The detailed description of the preferred embodiments of the present invention disclosed above is provided to enable those skilled in the art to implement and practice the present invention. Although the present invention has been described with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the invention. For example, those skilled in the art may utilize each configuration described in the above embodiments in a manner that combines with one another.

[0212] Accordingly, the present invention is not intended to be limited to the embodiments shown herein, but to be given the broadest scope consistent with the principles and novel features disclosed herein.

[0213] The SBFD wireless resource allocation and random access method of a UE and the apparatus for the same according to the embodiments of the present invention as described above are suitable for use in the SBFD-related communication environment of a 5G system under 3GPP, but can also be used in the same way in 6G and subsequent next-generation mobile communication systems under 3GPP.

Claims

1. A method for a user device (UE) to perform random access to a network in a mobile communication system, Receives configuration information related to RO (Random Access Opportunity) from a network, wherein the RO-related configuration information includes first-type RO information for general random access and second-type RO information for full-duplex (FD) related random access; and According to the condition for performing the above random access, the method includes transmitting a first random access preamble through one or more types of RO, among the first type RO according to the first type RO information and the second type RO according to the second type RO information. Method for performing random access.

2. In Paragraph 1, The condition for performing the above random access includes that the random access is a CFRA (Contention Free Random Access) triggered by a PDCCH (Physical Downlink Control Channel) order, and Based on the fact that the above random access is a CFRA triggered by a PDCCH command, receiving an indicator from the network via the PDCCH command representing either the first type RO and the second type RO, Method for performing random access.

3. In Paragraph 1, The condition for performing the above random access includes that the random access triggering event is a specific event, and Based on the fact that the above random access triggering event is the above specific event, transmitting the first random access preamble through the RO that arrives at the earlier of the first type RO and the second type RO, Method for performing random access.

4. In Paragraph 3, The above specific event is, Includes one or more events such as Beam Failure Recovery, state transition for SDT (Small Data Transmission) transmission, scheduling request failure, or synchronization reset, Method for performing random access.

5. In Paragraph 3, Based on the fact that the above random access triggering event is the above specific event, transmitting the first random access preamble through the RO that arrives earlier among the first type RO and the second type RO, regardless of type, Method for performing random access.

6. In Paragraph 3, Based on the fact that the above random access triggering event is not the above specific event, transmitting the first random access preamble through an RO of either the first type RO or the second type RO, Method for performing random access.

7. In Paragraph 3, Based on the failure to transmit the first random access preamble mentioned above, transmit the second random access preamble, Based on the fact that the above random access triggering event is the above specific event and the random access configuration method comprises the above first type RO information and the above second type RO information as a single random access configuration information, the above second random access preamble also transmits the above second random access preamble through the RO that arrives at the earlier time between the above first type RO and the above second type RO, Method for performing random access.

8. In Paragraph 7, The above random access triggering event is not the above specific event, and based on the fact that the above random access configuration method configures the above first type RO information and the above second type RO information as separate random access configuration information, the above second random access preamble is transmitted through the RO of the type used for transmitting the above first random access preamble among the above first type RO and the above second type RO. Method for performing random access.

9. In Paragraph 1, The conditions for performing the above random access include using a specific random access preamble format, and If the above random access triggering event is in Short Preamble Format, the first random access preamble is transmitted through the first type RO; and If the above random access triggering event is in Long Preamble Format, the first random access preamble is transmitted through the second type RO, Method for performing random access.

10. In Paragraph 1, The condition for performing the above random access includes the strength of the received signal from the network being smaller than a predetermined standard, and If the strength of the received signal is lower than the predetermined standard, the first random access preamble is transmitted through the first type RO; and When the strength of the received signal is greater than or equal to the predetermined standard, the first random access preamble is transmitted through the second type RO. Method for performing random access.

11. In Paragraph 1, Based on the failure to transmit the first random access preamble mentioned above, transmit the second random access preamble, The above second random access preamble is, Depending on whether the random access configuration method configures the first type RO information and the second type RO information as a single random access configuration information, or whether the random access configuration method configures the first type RO information and the second type RO information as separate random access configuration information, whether an RO of the same type as the RO used in the first random access preamble transmission is used is determined differently. Method for performing random access.

12. In Paragraph 11, Based on the above random access configuration method configuring the first type RO information and the second type RO information into a single random access configuration information, When the first random access preamble is transmitted through the second type RO, the second random access preamble is transmitted through a selected RO regardless of the type of the first type RO and the second type RO. Method for performing random access.

13. In Paragraph 11, Based on the above random access configuration method configuring the first type RO information and the second type RO information into a single random access configuration information, When the first random access preamble is transmitted through the first type RO, the second random access preamble is transmitted through the first type RO, Method for performing random access.

14. In Paragraph 13, Based on the failure to transmit the second random access preamble mentioned above, transmit the third random access preamble, The above third random access preamble is transmitted through a selected RO regardless of the type of the above first type RO and the above second type RO, Method for performing random access.

15. In Paragraph 11, Based on the above random access configuration method configuring the first type RO information and the second type RO information as separate random access configuration information, When the above first random access preamble is transmitted through the above second type RO, the above second random access preamble is transmitted through the above second type RO, Method for performing random access.

16. In Paragraph 11, Based on the above random access configuration method configuring the first type RO information and the second type RO information into a single random access configuration information, The PreambleReceivedTargetPower of the above random access is set separately for the first type RO and the second type RO, Method for performing random access.

17. In Paragraph 16, The maximum number of retransmissions (preambleTransMax) and power ramping step of the above random access are set commonly regardless of the RO type, Method for performing random access.

18. In Paragraph 17, When attempting to retransmit the preamble in the above random access, After a failure to transmit a random access preamble using the above-mentioned second-type RO, retransmission using the above-mentioned first-type RO is possible, and After a failure to transmit a random access preamble using the first type RO, retransmission using the second type RO is configured to be impossible, Method for performing random access.

19. In Paragraph 1, The above FD-related random access is Corresponding to random access using SBFD (Sub-Band Full Duplex) symbols, Method for performing random access.

20. A method in which a network assists random access of a user device (UE) in a mobile communication system, Transmitting configuration information related to RO (Random Access Opportunity) to the above UE, wherein the RO-related configuration information includes first-type RO information for general random access and second-type RO information for full-duplex (FD) related random access; and According to the condition for performing the above random access, the method includes receiving a first random access preamble through one or more types of RO, among the first type RO according to the first type RO information and the second type RO according to the second type RO information. Random access assistance method.

21. In a user device (UE) that performs random access to a network in a mobile communication system, At least one processor; and It includes at least one memory that can be operably connected to the at least one processor and stores instructions that cause the at least one processor to perform operations when executed, and The above operations are, Receives configuration information related to RO (Random Access Opportunity) from a network, wherein the RO-related configuration information includes first-type RO information for general random access and second-type RO information for full-duplex (FD) related random access; and According to the condition for performing the above random access, the method includes transmitting a first random access preamble through one or more types of RO, among the first type RO according to the first type RO information and the second type RO according to the second type RO information. User device.

22. In a network that supports random access of a user device (UE) in a mobile communication system, At least one processor; and It includes at least one memory that can be operably connected to the at least one processor and stores instructions that cause the at least one processor to perform operations when executed, and The above operations are, Transmitting configuration information related to RO (Random Access Opportunity) to the above UE, wherein the RO-related configuration information includes first-type RO information for general random access and second-type RO information for full-duplex (FD) related random access; and According to the condition for performing the above random access, the method includes receiving a first random access preamble through one or more types of RO, among the first type RO according to the first type RO information and the second type RO according to the second type RO information. network.

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