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

Abstract

This document relates to full duplex (FD)-related radio resource allocation and random access of a UE. To this end, a random access method performed by a UE comprises: when there is second-type random access opportunity (RO) information for FD-related random access in addition to first-type RO information for general random access among pre-secured pieces of RO-related information, performing random access to a network on the basis of the second-type RO information; and transmitting / receiving a signal to / from the network through FD-supporting radio resources. Here, the UE is a full duplex-aware UE, and indicates that the UE is the full duplex-aware UE to the network through the random access based on 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 eNB; 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 a user device (UE) to perform random access to a network in a mobile communication system is proposed, wherein, among the previously obtained information related to Random Access Opportunity (RO), there is a second type RO information related to Full Duplex (FD) random access in addition to a first type RO information related to general random access, the method comprises performing random access to the network based on the second type RO information; and transmitting and receiving signals through the network and FD-supported wireless resources, wherein the UE is a Full Duplex cognizing UE and indicates to the network that the UE is a Full Duplex cognizing UE through the random access based on the second type RO information.

[0015] In addition, when performing random access to the network based on the second type RO information, signals can be transmitted and received through the network and the full-duplex wireless resources without transmitting indication information to the network indicating that the UE is a full-duplex aware UE.

[0016] In addition, if the above-mentioned second type RO information is not available, it may additionally include performing random access to the network based on the above-mentioned first type RO information; transmitting indication information to the network indicating that the UE is a full-duplex recognized UE; and transmitting and receiving signals through the network and full-duplex wireless resources.

[0017] Here, the UE may include a UE in RRC_IDLE or RRC_INACTIVE mode.

[0018] At this time, the second type RO information can be obtained through an additional SIB received based on SIB 1 (System Information Block) 1 or the scheduling information included in SIB 1.

[0019] Here, the FD-supported wireless resource may include an SBFD (Sub-Band Full Duplex) symbol, and the second type RO information may represent RO information located in the uplink subband of the SBFD symbol.

[0020] Meanwhile, in another aspect of the present invention for solving the problem described above, a random access control method is proposed, wherein a base station in a mobile communication system controls random access of a user device (UE), the method comprises determining the type of random access of the UE; when the random access type is determined to be a first type, transmitting system information including first type RO information for general random access to the UE; and when the random access type is determined to be a second type, transmitting system information including second type RO information for full duplex (FD) related random access to the UE.

[0021] The base station may be configured to always include the second type RO information in the system information and transmit it, and at this time, may receive a random access preamble from the UE based on the second type RO information.

[0022] In addition, the base station may be configured to transmit system information including only the first type RO information, and at this time, may receive a random access preamble based on the first type RO information from the UE.

[0023] Additionally, the base station may be configured to transmit the system information including the first type RO information and the second type RO information, and at this time, it may receive a random access preamble from the UE through the RO that arrives at the earlier of the first type RO based on the first type RO information and the second type RO based on the second type RO information.

[0024] Additionally, the base station may be configured to transmit the system information including the first type RO information and the second type RO information, and at this time, it may receive a random access preamble from the UE through an RO arbitrarily selected from the first type RO based on the first type RO information and the second type RO based on the second type RO information.

[0025] Meanwhile, the base station may respond to the source base station during handover, in which case it transmits a handover request message to the target base station; receives a handover request confirmation message from the target base station; and additionally transmits a Radio Resource Control (RRC) reconfiguration message to the UE based on the handover request confirmation message, wherein one or more of the handover request message, the handover request confirmation message, or the RRC reconfiguration message may include one or more of the first type RO information or the second type RO information.

[0026] Meanwhile, in another aspect of the present invention for solving the problem described above, a user device (UE) for 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, when there is a second type RO information for Full Duplex (FD) related random access separate from a first type RO information for general random access among previously secured RO (Random Access Opportunity) related information, performing random access to the network based on the second type RO information; and transmitting and receiving signals through the network and FD-supported wireless resources, wherein the UE is a Full Duplex cognitive UE and indicates to the network that the UE is a Full Duplex cognitive UE through the random access based on the second type RO information.

[0027] In addition, in another aspect of the present invention, a base station for controlling random access of a user device (UE) 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, when executed, cause the at least one processor to perform operations, wherein the operations include determining a type of random access of the UE; transmitting system information including first type RO information for general random access to the UE when the random access type is determined to be a first type; and transmitting system information including second type RO information for full duplex (FD) related random access to the UE when the random access type is determined to be a second type.

[0028] According to the embodiments of the present invention as described above, by defining a random access method of a UE according to the allocation of an FD-related RO, communication efficiency can be increased by omitting separate indicator signaling for the FD-aware UE.

[0029] In addition, according to an embodiment, the base station can determine the random access type of the UE and manage resources according to the network conditions.

[0030] In addition, according to the embodiment, if both the first type RO and the second type RO are set, the delay occurring in random access can be minimized or the probability of collision can be reduced.

[0031] In addition, according to the embodiment, the handover procedure can be streamlined by additionally including FD-related information, such as the aforementioned second type RO information, in the handover request message, handover request confirmation message, and RRC reconstruction message.

[0032] 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.

[0033] Figure 1 shows the structure of a system for 5G communication.

[0034] Figure 2 is a diagram illustrating how to perform FD operation in 5G.

[0035] Figures 3 and 4 are diagrams for explaining the comparison between SBFD and SSFD during FD operation in 5G.

[0036] 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.

[0037] FIG. 6 is a diagram illustrating the process of a UE acquiring second type RO information according to an embodiment of the present invention.

[0038] FIG. 7 is a diagram illustrating a procedure for a UE to perform random access based on a first type RO according to another embodiment of the present invention.

[0039] Figures 8 and 9 are drawings for specifically explaining the procedures of CBRA and CFRA and each message.

[0040] FIG. 10 is a diagram illustrating a method for a base station to control random access of a UE according to an embodiment of the present invention.

[0041] FIG. 11 is a diagram illustrating a random access type determination method of a UE according to an embodiment of the present invention in relation to signaling in a handover situation.

[0042] FIG. 12 illustrates a wireless device that can be applied to the present technology.

[0043] 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.

[0044] 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.

[0045]

[0046] 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.

[0047] Figure 2 is a diagram illustrating how to perform FD operation in 5G.

[0048] 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).

[0049] 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.

[0050] 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'.

[0051]

[0052] Figures 3 and 4 are diagrams for explaining the comparison between 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 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.

[0054] 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.

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

[0057] 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).

[0058] 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'.

[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 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.

[0060]

[0061] Below, against this background, the allocation of ROs related to SBFD and the resulting random access method for UEs are explained in detail.

[0062] 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.

[0063] 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.

[0064] 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").

[0065] 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.

[0066] With this background, referring to FIG. 5, a UE according to one embodiment of the present invention can determine (S510) whether there is a second type RO information described above separately from the first type RO information described above among the previously secured RO-related information.

[0067] If there is Type 2 RO information, the UE according to the present embodiment proposes to perform random access to the network based on Type 2 RO information (S520). At this time, the UE can transmit and receive signals through the network and SBFD wireless resources (S550) without needing to inform the network of whether it is an SBFD or a UE through separate instruction information.

[0068] That is, in this embodiment, it is proposed that the UE be configured to indicate to the network that the UE is an SBFD or a UE through random access based on second-type RO information.

[0069] In contrast, if the UE does not have Type 2 RO information, the UE can perform random access to the network based on Type 1 RO information (S530), and in this case, the UE suggests transmitting indication information to the network indicating that the UE is an SBFD or UE (S540).

[0070] In this way, indication information indicating that it is an SBFD-aware UE utilizes additional uplink signaling after random access, for example, it can indicate that it is an SBFD-aware UE through a pre-configured PUCCH (Physical Uplink Control Channel). In this case, an indicator in the form of a bit or sequence can be configured and used. Alternatively, it is also possible to define an indicator field indicating that it is an SBFD-aware UE through the MAC-CE (Medium Access Control - Control Element) of the PUSCH (Physical Uplink Shared Channel) and indicate it through this.

[0071] Meanwhile, in another embodiment of the present invention, during the process of random access, it may be indicated that the UE is an SBFD or a UE, and, for example, this indication information may be transmitted using a specific type of random access preamble.

[0072] In this way, after transmitting the SBFD-recognized UE indicator, the UE can perform communication (S550) using the network and SBFD wireless resources.

[0073] In the embodiment of FIG. 5, the UE may be a UE in RRC_IDLE or RRC_INACTIVE mode. We will examine in detail how such a UE in RRC_IDLE or RRC_INACTIVE mode obtains second type RO information.

[0074]

[0075] FIG. 6 is a diagram illustrating the process of a UE acquiring second type RO information according to an embodiment of the present invention.

[0076] A UE in RRC_IDLE or RRC_INACTIVE mode can receive a Master Information Block (MIB) from a network (e.g., a base station (gNB)) via a Physical Broadcast Channel (PBCH) (S610). The MIB may contain the most basic system information for the UE's network connection, and subsequent System Information Blocks (SIBs), excluding the MIB, can be received via a Physical Downlink Control Channel (PDCCH) or a Physical Downlink Shared Channel (PDSCH).

[0077] Accordingly, FIG. 6 illustrates receiving a PDCCH for receiving a subsequent SIB through a Type 0-PDCCH of 5G (S620). Based on this, SIB 1 containing scheduling information for receiving a subsequent SIB among the SIBs can be received (S630), and in one embodiment of the present invention, receiving a second type RO information through this SUB 1 is proposed.

[0078] Based on the scheduling information obtained through the reception of this SIB 1, an additional SIB (shown as 'other SIB' in FIG. 6) can be received (S640), and in another embodiment of the present invention, it is proposed to receive a second type RO information through this additional SIB.

[0079] By utilizing the second type RO information obtained in this way, the UE can perform random access (S650) as described above in relation to FIG. 5, and in FIG. 6, the second type RO information is referred to as 'additional RO' as RO information additionally assigned to the first type RO information.

[0080] After random access based on this Type 2 RO information, the UE can transmit and receive control signals / data with the network using SBFD symbols.

[0081] That is, in the embodiment of FIG. 5, the 'previously secured RO-related information' can be secured through SIB 1 or an additional SIB received based on the scheduling information included in SIB 1, as described above.

[0082]

[0083] FIG. 7 is a diagram illustrating a procedure for a UE to perform random access based on a first type RO according to another embodiment of the present invention.

[0084] The embodiment illustrated in FIG. 7 illustrates a case where the UE fails to obtain a second type RO and performs random access based on a first type RO for general random access (S710). In FIG. 7, the first type RO is referred to as 'legacy RO' in terms of existing RO information for random access.

[0085] In this way, when performing random access based on the first type RO, the UE needs to transmit an indicator to the network indicating whether it is an SBFD or a UE, and FIG. 7 illustrates an example of transmitting such an indicator via PUCCH or PUSCH (S720).

[0086] In this way, after the UE transmits an indicator to the network indicating whether it is an SBFD or a UE, the UE and the network can transmit and receive control information / data using the SBFD symbol (S730).

[0087]

[0088] Random access type

[0089] Figures 8 and 9 are drawings for specifically explaining the procedures of CBRA and CFRA and each message.

[0090] FIGS. 8 and 9 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.

[0091] First, there are the following cases where a UE performs random access.

[0092] - When the UE performs initial access because it does not have an RRC connection with the base station

[0093] - When the UE first connects to the target cell during the handover process

[0094] - When a random access process is requested by a command from the base station

[0095] - 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

[0096] - When performing a recovery process in the event of a radio link failure or handover failure

[0097]

[0098] 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.

[0099] Referring to reference numeral 720 in FIG. 8, the CFRA procedure can be performed as follows.

[0100] (1) Random access preamble allocation (step 0)

[0101] 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.

[0102] 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.

[0103] (2) Transmission of the first message (Step 1)

[0104] 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.

[0105] (3) Receive second message (Step 2)

[0106] 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).

[0107] 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.

[0108] 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.

[0109]

[0110] 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. 8.

[0111] 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).

[0112] (1) Transmit the first message (Step 1)

[0113] 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).

[0114] (2) Receive the second message (Step 2)

[0115] 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.

[0116] (3) Transmit the third message (Step 3)

[0117] 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.

[0118] 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.

[0119] (4) Receive the 4th message (Step 4)

[0120] 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.

[0121]

[0122] Meanwhile, reference numeral 810 in FIG. 9 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. 8.

[0123] 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. 9, includes the first message and the third message in the four-stage random access of reference numeral 710 in FIG. 8 (step A).

[0124] 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. 8 (step B).

[0125] In addition, reference numeral 820 of FIG. 9 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. 8.

[0126] In this case, message A is the same as the case of the two-stage random access of reference numeral 810 in FIG. 9 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. 8.

[0127]

[0128] Random access type determination by base station

[0129] FIG. 10 is a diagram illustrating a method for a base station to control random access of a UE according to an embodiment of the present invention.

[0130] The base station according to the present embodiment can first determine the type of random access of the UE (S1010).

[0131] If the base station determines the random access type of the UE as a first type, it transmits system information including first type RO information for general random access to the UE (S1020), and if the base station determines the random access type as a second type, it transmits system information including second type RO information for SBFD-related random access to the UE (S1030).

[0132] Based on the transmission of system information from the base station, the UE can perform random access depending on whether it obtains Type 2 RO information as described above in relation to FIG. 5, and the base station can receive a random access preamble from the UE (S1040).

[0133]

[0134] Specifically, the base station may be configured to always include Type 2 RO information in the system information and transmit it, in which case it may induce the reception of a random access preamble from the UE based on the Type 2 RO information. In this case, as described above, the reception of an indicator indicating that it is a separate SBFD-identified UE may be omitted.

[0135] Additionally, the base station may be configured to transmit system information including only Type 1 RO information, in which case it may induce the reception of a random access preamble from the UE based on the Type 1 RO information. In this case, as described above, it may be necessary to receive an indicator indicating that it is a separate SBFD-identified UE.

[0136]

[0137] Meanwhile, the base station may be configured to transmit system information including both Type 1 RO information and Type 2 RO information, in which case the UE can transmit a random access preamble through the RO that arrives earlier between the Type 1 RO based on the Type 1 RO information and the Type 2 RO based on the Type 2 RO information. Through such a configuration, the UE has the advantage of being able to minimize the latency for random access.

[0138] Meanwhile, as described above, when a base station transmits system information including both Type 1 RO information and Type 2 RO information, in another embodiment of the present invention, a UE may be configured to transmit a random access preamble through an RO arbitrarily selected from a Type 1 RO based on Type 1 RO information and a Type 2 RO based on Type 2 RO information. As described above, using the RO that arrives faster between the Type 1 RO and the Type 2 RO has the advantage of minimizing delay, but the probability of collisions occurring between UEs may increase. Accordingly, the present embodiment proposes transmitting a random access preamble through an RO arbitrarily selected by the UE from the Type 1 RO and the Type 2 RO to reduce the probability of collisions.

[0139]

[0140] Handover situation

[0141] FIG. 11 is a diagram illustrating a random access type determination method of a UE according to an embodiment of the present invention in relation to signaling in a handover situation.

[0142] In a handover situation, first, the source base station (Source gNB) can send a handover request message to the target base station (Target gNB) (S1110).

[0143] Accordingly, after acceptance through permission control (S1120), the target base station can transmit a handover request confirmation message to a minority of base stations (S1130). The handover request confirmation message transmitted in this manner may include information such as cell ID and system information, which allows the UE to connect to the target base station without a SIB decoding procedure. The information may include random access (RA) configuration information, and in one embodiment of the present invention, it is proposed to configure the handover request confirmation message to include and transmit second type RO information.

[0144]

[0145] Meanwhile, the source base station can transmit information received from the target base station to the UE through an RRC reconfiguration message (S1140). In one embodiment of the present invention, it is proposed to configure the transmission to include a second type RO information in such an RRC reconfiguration message.

[0146] The UE performs random access through the RO based on this RA configuration information (S1150), and this random access of the UE can be determined based on whether it possesses a second type RO according to the embodiment described above in relation to FIG. 5.

[0147] In some cases, the source base station / target base station may determine the random access type of the UE according to the embodiment described above in relation to FIG. 6. That is, the random access type of the UE may be controlled by determining whether to include second type RO information in the handover request message / handover request confirmation message / RRC reconstruction message according to the determination of the source base station / target base station.

[0148]

[0149] Specifically, after the target base station accepts the handover, the source base station may be configured to perform RA for a specific RO type according to the random access setting information within the RRC reconstruction message transmitted to the SBFD-aware UE based on the information included in the handover request acknowledgment message.

[0150]

[0151] For example, (A1) if the RRC reconstruction message transmitted to the UE contains only Type 1 RO information, the UE can perform Type 1 RO-based RA operations.

[0152] In addition, (A2) if the handover request acknowledgment message contains only Type 2 RO information, the UE can perform Type 2 RO-based RA operations.

[0153] In addition, (A3) if there is configuration information for both Type 1 RO and Type 2 RO, priority settings can be pre-set to perform RA based on a specific RO, or determined according to the situation, and operations can be performed accordingly. That is, it is possible to set and operate to prioritize the execution of RA through Type 2 RO. Alternatively, it is possible to set and operate to perform RA through Type 1 RO.

[0154] In addition, (A4) if there is configuration information for both the first type RO and the second type RO, it is possible to operate by performing the RO quickly through the RO that has priority over the specific type RO, and in other embodiments, the UE may be allowed to make an arbitrary selection as described above.

[0155]

[0156] The above-described method (A1) or method (A2) can be operated as an operation in which the source base station instructs the UE to perform RA using a specific RO type. That is, the target base station provides both Type 1 RO and Type 2 RO information, but the source base station can specify the RO type to be used by the UE by including only the configuration information for the specific RO in the RRC reconfiguration message and transmitting it.

[0157] Alternatively, the above-described method (A1) or method (A2) may be operated as an operation in which the target base station instructs the UE to perform RA using a specific RO type. That is, the target base station may provide only one of the first type RO and second type RO information, and the source base station may specify the RO type used by the UE by including the information in an RRC reconstruction message and transmitting it to the UE.

[0158] In addition, method (A3) can be utilized by preconfiguring which RO type to prioritize for RA execution for each UE-specific, cell-specific, or RA triggering event.

[0159] In addition, in one embodiment of the present invention, the RA of the UE in a handover situation may utilize CFRA, and the CFRA may be operated by setting it to use a specific type of RO.

[0160]

[0161] Meanwhile, the source base station can request configuration information related to Type 2 RO for RA operation from the target base station through a handover request message.

[0162] (B1) When there is a request for configuration information related to Type 2 RO in the handover request message, the target base station transmits a handover request acknowledgment message containing configuration information for both Type 1 RO and Type 2 RO to the source base station, and the source base station can transmit the configuration information to the UE through an RRC reconfiguration message. Subsequently, the UE can perform RA with priority on Type 2 RO.

[0163] In addition, (B2) if there is no request for configuration information related to the second type RO in the handover request message, the target base station transmits a handover request confirmation message containing configuration information for the first type RO to the source base station, and the source base station can transmit the configuration information to the UE through an RRC reconfiguration message. Subsequently, the UE can perform RA with priority on the first type RO.

[0164] Meanwhile, in the case where configuration information for both legacy RO and Additional RO is delivered to the UE as in method (B3) (B1), the RA based on a specific RO is configured to be performed prioritized, and the operation is performed accordingly. That is, it is possible to configure and operate the RA through Additional RO to be prioritized. Or it is possible to configure and operate the RA through legacy RO.

[0165] In addition, (B4) if there is a request for configuration information related to the second type RO in the handover request message, the target base station transmits a handover request confirmation message containing at least one of configuration information for the first type RO and the second type RO to the source base station, and the source base station can transmit the configuration information to the UE through an RRC reconfiguration message. Subsequently, if the UE receives only one RO configuration information, it can perform RA through the RO type corresponding to the configuration information. That is, it is possible to operate in a way that the target base station determines which RO to use to perform RA.

[0166] In addition, (B5) if there is a request for configuration information related to the second type RO in the handover request message, the target base station transmits a handover request confirmation message containing both configuration information for the first type RO and the second type RO to the source base station, and the source base station can transmit an RRC reconfiguration message containing at least one of configuration information for the first type RO and the second type RO to the UE. Subsequently, if the received RO configuration information is one, the UE can perform RA through the RO type corresponding to that configuration information. That is, it can be operated in a way that the source base station determines which RO to perform RA through.

[0167] In addition, (B6) when there is a request for configuration information related to the second type RO in the handover request message, and subsequently the configuration information for both the first type RO and the second type RO is transmitted to the UE by the target base station and the source base station, it is possible to operate in a way that quickly performs the RO through the RO that has priority in timing rather than priority for a specific type RO.

[0168]

[0169] The following operation is also possible as a variation or combination of the detailed methods of these embodiments (B5) and (B6).

[0170] For example, in the detailed methods of embodiments (B5) and (B6), the methods in which the UE performs RA through the second type RO can be utilized to recognize the target base station as SBFD or UE.

[0171] In addition, when a handover request is made from a source base station to a target base station, information indicating whether the handover target UE is an SBFD or a UE may be transmitted to the target base station.

[0172]

[0173] Through such random access, the UE is RRC_CONNECTED to the target base station and can send an RRC reconstruction complete message to the target base station (S1060).

[0174]

[0175] FIG. 12 illustrates a wireless device that can be applied to the present technology.

[0176] Referring to FIG. 12, 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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, code, 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.

[0182] 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.

[0183]

[0184] 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.

[0185] 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.

[0186] 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, If, among the previously secured RO (Random Access Opportunity) related information, there is a second type RO information for Full Duplex (FD) related random access separate from the first type RO information for general random access, random access to the network is performed based on the second type RO information; and Includes transmitting and receiving signals through the above network and FD-supported wireless resources, The above UE is a fully duplex-aware UE, and Indicating to the network that the UE is a full-duplex aware UE through the random access based on the above second-type RO information, Method for performing random access.

2. In Paragraph 1, When performing random access to the network based on the above-mentioned second-type RO information, transmitting and receiving signals through the network and the full-duplex wireless resource without transmitting indication information to the network indicating that the UE is a full-duplex aware UE, Method for performing random access.

3. In Paragraph 1, If the above-mentioned second-type RO information is not available, random access to the network is performed based on the above-mentioned first-type RO information; The above network transmits instruction information indicating that the UE is a full-duplex aware UE; and additionally including transmitting and receiving signals through the above network and full-duplex wireless resources, Method for performing random access.

4. In Paragraph 1, The above UE includes a UE in RRC_IDLE or RRC_INACTIVE mode, Method for performing random access.

5. In Paragraph 4, The above-mentioned second type RO information is obtained through an additional SIB received based on SIB 1 (System Information Block) 1 or the scheduling information included in SIB 1, Method for performing random access.

6. In Paragraph 1, The above FD-supported radio resources include SBFD (Sub-Band Full Duplex) symbols, and The above second type RO information represents RO information located in the uplink subband of the above SBFD symbol, Method for performing random access.

7. A method for a base station to control random access of a user device (UE) in a mobile communication system, Determine the type of random access of the above UE; If the above random access type is determined to be a first type, system information including first type RO information for general random access is transmitted to the UE; and When the above random access type is determined to be a second type, the system includes transmitting system information containing second type RO information for full duplex (FD) related random access to the UE. Random access control method.

8. In Paragraph 7, The above base station is configured to always include the above Type 2 RO information in the system information and transmit it, Receiving a random access preamble from the above UE based on the above Type 2 RO information, Random access control method.

9. In Paragraph 7, The above base station is configured to transmit system information including only the above-mentioned first-type RO information, and Receiving a random access preamble from the above UE based on the above type 1 RO information, Random access control method.

10. In Paragraph 7, The above base station is configured to transmit system information including the above-mentioned first-type RO information and the above-mentioned second-type RO information, and Receiving a random access preamble from the above UE through the RO that arrives at the earlier of the first type RO based on the first type RO information and the second type RO based on the second type RO information, Random access control method.

11. In Paragraph 7, The above base station is configured to transmit system information including the above-mentioned first-type RO information and the above-mentioned second-type RO information, and Receiving a random access preamble from the above UE through an RO arbitrarily selected from a first type RO based on the first type RO information and a second type RO based on the second type RO information, Random access control method.

12. In Paragraph 7, The above base station corresponds to the source base station during handover, and Send a handover request message to the target base station; Receive a handover request confirmation message from the above target base station; and Based on the handover request acknowledgment message above, additionally includes sending a Radio Resource Control (RRC) reconfiguration message to the UE, One or more of the above handover request message, the above handover request acknowledgment message, or the above RRC reconstruction message includes one or more of the above first type RO information or the above second type RO information, Random access control method.

13. 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, If, among the previously secured RO (Random Access Opportunity) related information, there is a second type RO information for Full Duplex (FD) related random access separate from the first type RO information for general random access, random access to the network is performed based on the second type RO information; and Includes transmitting and receiving signals through the above network and FD-supported wireless resources, The above UE is a fully duplex-aware UE, and Indicating to the network that the UE is a full-duplex aware UE through the random access based on the above second-type RO information, User device.

14. In a base station that controls 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, Determine the type of random access of the above UE; If the above random access type is determined to be a first type, system information including first type RO information for general random access is transmitted to the UE; and When the above random access type is determined to be a second type, the system includes transmitting system information containing second type RO information for full duplex (FD) related random access to the UE. Base station.

Images