SBFD-related configuration change and random access by ue

Abstract

The present document relates to a sub-band full duplex (SBFD)-related configuration change, a random access method for a UE according to same, and an apparatus therefor. To this end, a method by which a UE performs random access proposes receiving a paging message from a network, wherein the paging message includes downlink control information (DCI) having a predetermined format, and the DCI notifies information about a full duplex (FD)-related configuration change. Accordingly, the UE may perform random access to the network, on the basis of the information about the FD-related configuration change.

Description

Changing SBFD-related settings and random access of UE

[0001] The following description is about SBFD (Sub-Band Full Duplex) based communication, and specifically, about SBFD related setting changes, UE random access method according to the changes, and devices for the same.

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

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

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

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

[0006]

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

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

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

[0010] The technology proposed below is assumed to be applicable not only to the current 5G system but also to 6G and subsequent mobile communication systems. Therefore, the term 'SBFD' used in 5G may be referred to as another term related to FD, but for the convenience of explanation below, the term of 5G will be used for the explanation.

[0011] In one aspect of the present invention, we propose a method for changing SBFD-related settings and a random access method of a UE according to the change, and a device therefor.

[0012] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0013] In one aspect of the present invention for solving the above-described problem, a method for performing random access by a user equipment (UE) in a mobile communication system is proposed, the method including receiving a paging message from the network, the paging message including DCI (Downlink Control Information) in a predetermined format, the DCI indicating full duplex (FD) related setting change information; and performing random access to the network based on the FD related setting change information.

[0014] The above UE may be a UE in RRC_IDLE or RRC_INACTIVE mode.

[0015] Specifically, in one embodiment of the present invention, it is proposed that the first codepoint of the SMI (Short Message Indicator) of the DCI indicates a change in the FD-related settings.

[0016] In another embodiment of the present invention, it is proposed that the SMI (Short Message Indicator) of the DCI indicates a second code point indicating that only scheduling information for paging exists in the DCI, and the SM (Short Message) of the DCI indicates a change in the FD-related settings.

[0017] In another embodiment of the present invention, when the SM indicates a change in the SIB (System Information Block) settings, the UE may process it as indicating a change in the FD-related settings.

[0018] In another embodiment of the present invention, if the SM has a second value different from the first value indicating a change in the SIB (System Information Block) settings, the UE may process it as indicating a change in the FD-related settings.

[0019] Additionally, the FD-related setting change information may be transmitted through a downlink shared channel scheduled by the DCI.

[0020] The above FD related setting information may include SBFD (Sub-Band Full Duplex) related setting information.

[0021] In addition, performing the random access can be performed through an SBFD symbol, taking into account changes in the SBFD-related setting information.

[0022] Alternatively, performing the random access may be configured to be performed through symbols other than the SBFD symbol.

[0023] Meanwhile, in another embodiment of the present invention, a method for performing random access by a user equipment (UE) in a mobile communication system, the method comprising: when the UE is a Sub-Band Full Duplex (SBFD) UE and the UE performs random access to the network in an RRC_INACTIVE state, performing the random access based on TDD (Time Division Duplex) UL (Uplink) -DL (Downlink) configuration information regardless of SBFD settings, is proposed.

[0024] At this time, when the UE performs SDT (Small Data Transmission), the SDT may include performing the SDT based on the TDD UL-DL configuration information regardless of the SBFD setting.

[0025] Meanwhile, in another aspect of the present invention, a method for assisting random access of a user equipment (UE) in a mobile communication system is proposed, comprising: transmitting a paging message to the UE, the paging message including DCI (Downlink Control Information) of a predetermined format, the DCI indicating full duplex (FD) related configuration change information; and responding to the random access of the UE based on the FD related configuration change information.

[0026] Meanwhile, in another aspect of the present invention, a user equipment (UE) for performing random access to a network in a mobile communication system is proposed, comprising: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, wherein the operations include receiving a paging message from the network, the paging message including Downlink Control Information (DCI) in a predetermined format, the DCI indicating Full Duplex (FD) related configuration change information; and performing random access to the network based on the FD related configuration change information.

[0027] Meanwhile, in another aspect of the present invention, a network for assisting random access of a user equipment (UE) in a mobile communication system is proposed, comprising: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, wherein the operations include transmitting a paging message to the UE, the paging message including Downlink Control Information (DCI) in a predetermined format, the DCI indicating Full Duplex (FD) related configuration change information; and responding to the random access of the UE based on the FD related configuration change information.

[0028] According to the embodiments of the present invention as described above, SBFD-based communication applicable to 5G or subsequent next-generation mobile communication systems can be efficiently implemented.

[0029] In addition, in situations where SBFD-related settings are changed, the possibility of resource conflict can be prevented and efficient resource use can be implemented by specifically defining the random access method of the UE accordingly.

[0030] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0031] Figure 1 shows the structure of a system for 5G communication.

[0032] Figure 2 is a drawing for explaining a method of performing FD operation in 5G.

[0033] FIG. 3 and FIG. 4 are drawings for comparing and explaining SBFD and SSFD during FD operation in 5G.

[0034] FIG. 5 is a diagram for explaining a method for a UE to perform random access when changing SBFD settings according to one embodiment of the present invention.

[0035] FIG. 6 is a diagram for explaining a method for indicating SBFD setting change information through a paging message in a 5G network according to one embodiment of the present invention.

[0036] Figures 7 and 8 are drawings specifically explaining the procedures and each message of CBRA and CFRA.

[0037] FIGS. 9 to 11 are diagrams for explaining a legacy TDD UL-DL configuration-based operation method that takes into account the possibility of changing SBFD settings according to another embodiment of the present invention.

[0038] Figure 12 illustrates a wireless device to which the present technology can be applied.

[0039] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and similar parts have been designated with similar reference numerals throughout the specification.

[0040] Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0041]

[0042] As described above, one aspect of the present invention proposes a method for changing SBFD-related settings, a UE random access method based on these settings, and a device for this purpose. To this end, we first provide a detailed explanation of the FD method currently being discussed in 5G.

[0043] Figure 2 is a drawing for explaining a method of performing FD operation in 5G.

[0044] Referring to Fig. 2, a method of applying FD operation in an intra-carrier is illustrated. Specifically, the FD operation may be considered to be the Sub-Band Full Duplex (SBFD) method illustrated in Fig. 2 (a) and the Spectrum-Sharing Full Duplex (SSFD) method illustrated in Fig. 2 (b).

[0045] In the case of SBFD, transmission and reception of DL and UL can be performed using different frequency resources on the same carrier. That is, DL and UL can have different frequency resources for the same time resource. In the case of SSFD, transmission and reception of DL and UL are performed using the same frequency resources or overlapping frequency resources on the same carrier. That is, DL and UL can be assigned the same or overlapping frequency resources for the same time resource.

[0046] In the case of SBFD, it may be referred to as 'Subband-Wise Full Duplex' or 'Subband non-overlapping Full Duplex' considering the non-overlapping characteristic that distinguishes it from SSFD.

[0047]

[0048] FIG. 3 and FIG. 4 are drawings for comparing and explaining SBFD and SSFD during FD operation in 5G.

[0049] First, SBFD can be considered in FIG. 3 (a) and FIG. 4 (a). Specifically, referring to FIG. 3 (a), the subband region of the DL and the subband region of the UL may not overlap each other. In this case, a guard band may exist between the subband region of the DL and the subband region of the UL. Alternatively, referring to FIG. 2 (a), the SBFD operation can be performed based on a resource pattern of a cell or base station. For example, in the resource pattern, a half-duplex (HD) slot / symbol and an SBFD slot / symbol can be TDM'd with each other.

[0050] Alternatively, SSFD may be considered as examples such as those in FIG. 3 (b) and FIG. 4 (b). Specifically, referring to FIG. 3 (b), the subband region of the DL and the subband region of the UL may overlap with each other. Alternatively, referring to FIG. 4 (b), the SSFD operation may be performed based on a resource pattern of a cell or base station. For example, in the resource pattern, a half-duplex (HD) slot / symbol and an SSFD slot / symbol may be TDM'd with each other.

[0051]

[0052] These FD operations can be combined with existing half-duplex (HD) operations. For example, in existing half-duplex-based TDD operations, only some time resources can be used for FD operations. In the time resources where FD operations are performed, SBFD or SSFD operations can be performed.

[0053] In the case of the FD operation described above, the FD operation can be performed from both the gNB perspective and the UE perspective. For example, both the gNB and the UE can simultaneously transmit and receive DL / UL using the same or different frequency resources in the same time resource. Alternatively, only the gNB can perform the FD operation (in the same time resource), and the UE can perform the HD operation. The gNB can simultaneously transmit and receive DL and UL using the same or different frequency resources in the same time resource, but the UE can perform only DL reception or only UL transmission in a specific time resource. In this case, the gNB can perform the FD operation in a way that performs DL transmission and UL reception for different UEs at the same time point (or, the same time resource).

[0054] As described above, in a network such as a gNB that performs FD operations, whether a UE can perform FD operations may be related to the UE's performance. Thus, if a UE is aware of and capable of performing FD operations in a network, the UE may be referred to as an "FD-aware UE."

[0055] In addition, among the SBFD and SSFD described above, one embodiment of the present invention proposes an FD operation using the SBFD method. The SBFD method supports HDs that do not overlap with each other in sub-band units, and thus has the advantage of being able to operate flexibly not only from the perspective of SBFD-aware UEs but also from the perspective of legacy UEs that are unaware of the SBFD situation.

[0056]

[0057] Below, under this background, a specific description is given of a case in which SBFD-related settings are changed when an SBFD-aware UE performs random access.

[0058] When a UE in the RRC_IDLE or RRC_INACTIVE state with SBFD attempts to transition to the RRC_CONNECTED state, the UE can attempt random access to the network. If the cell-specific configuration related to SBFD changes at the time when the random access attempt is required, the UE may not be able to perform random access operations on the SBFD symbol. In this case, the UE may have to connect to the gNB as an initial random access operation, which may result in inefficiency.

[0059] Therefore, when the SBFD setting is changed to a UE in RRC_IDLE or RRC_INACTIVE state, an action and procedure may be required to indicate whether the setting has been changed or what information has been changed.

[0060] FIG. 5 is a diagram for explaining a method for a UE to perform random access when changing SBFD settings according to one embodiment of the present invention.

[0061] In the embodiment proposed in FIG. 5, the UE (510) receives a paging message (S510) from the network (520), and the paging message includes DCI (Downlink Control Information) in a predetermined format, and the DCI is proposed to inform of FD-related setting change information.

[0062] At this time, taking the 5G system as an example, the DCI of the above-mentioned format may be DCI format 1_0 scrambled with P-RNTI, and the FD-related setting information may be the SBFD-related setting information described above.

[0063] SBFD related configuration information may be transmitted as included in DCI format 1_0 or may be transmitted through PDSCH (Physical Downlink Shared Channel) scheduled by DCI format 1_0.

[0064] In this way, the UE (510) that has acquired FD-related setting change information through a paging message can perform random access to the network (520) based on this (S520). In one embodiment, random access can be performed through a changed SBFD symbol based on the FD-related setting change information. In another embodiment, random access can be performed through a symbol other than the SBFD symbol based on the FD-related setting change information.

[0065]

[0066] Below, the proposed embodiment with respect to Fig. 5 is described in more detail.

[0067] FIG. 6 is a diagram for explaining a method for indicating SBFD setting change information through a paging message in a 5G network according to one embodiment of the present invention.

[0068] The paging message may be received by the serving cell (gNB 1) of the UE as a paging message (S610) of the core network (CN) and / or as a RAN paging message (S620) from a cell (gNB2) other than the serving cell (gNB1) of the UE, as illustrated in FIG. 6.

[0069] Accordingly, gNB 1, which performs the role of a serving cell, can transmit a paging message to the UE (S640) through a paging control procedure (S630). At this time, the UE may be in an RRC_IDLE or RRC_INACTIVE state.

[0070] As described above, in the physical layer, a paging message can be transmitted in DCI format 1_0 scrambled with P-RNTI, and DCI format 1_0 scrambled with P-RNTI can be represented as shown in the table below.

[0071] Field (Item)BitsReferenceShort Message Indicator2Refer to 38.212 - Table 7.3.1.2.1-1Short Messages8This field is set as reserved when 'Short Message Indicator' field is 01. Refer to 38.331 - Table 6.5-1Frequency domain resource assignmentVariableVariable with DL BWP N_RBroof (log2(N DL, BWP RB +1) / 2))(N DL, BWP RBindicates the size of CORESET 0Time domain resource assignment4Carries the row index of the items in pdsch_allocationList in RRCVRB-to-PRB mapping1According to 38.212 Table 7.3.1.1.2-330: Non-Interleaved1: InterleavedModulation and coding scheme538.214 - Table 5.1.3.1-1: MCS index table 1 for PDSCH38.214 - Table 5.1.3.1-2 MCS index table 2 for PDSCHTB Scaling2Reserved6Reserved

[0072]

[0073] In one embodiment of the present invention (method 1), it is proposed to use an SMI (Short Message Indicator) of the DCI format 1_0 to instruct an SBFD-aware UE whether to change SFBD-related configuration information.

[0074] The SMI of DCI format 1_0 can be represented in the table below.

[0075] Bit FieldShort Message Indicator00Reserved01Only scheduling information for Paging is present in the DCI10Only short message is present in the DCI11Both scheduling information for Paging and short message are present in the DCI

[0076] First, in one embodiment of the present invention, it is proposed to indicate the above-described FD-related setting change (SBFD setting change) through the reserved first codepoint (00) of [Table 2].

[0077] Meanwhile, the SM (Short Message) indicated by the SMI in [Table 2] can be expressed as shown in the table below.

[0078] BitShort Message Indicator1systemInfoModificationIf set to 1: indication of a BCCH modification other than SIB6, SIB7 and SIB8.2etwsAndCmasIndicationIf set to 1: indication of an ETWS primary notification and / or an ETWS secondary notification and / or a CMAS notification3-[8]Not used in this release of the specification, and shall be ignored by UE if received

[0079] Based on this, in another embodiment of the present invention (method 2), the SMI of [Table 2] indicates a second code point (01) indicating that only scheduling information for paging exists in the DCI, and it is proposed to indicate a change in the FD-related settings (SBFD settings change) through reserved values ​​3-8 among the values ​​of SM of [Table 3].

[0080] Meanwhile, in another embodiment of the present invention (method 3), the SMI of [Table 2] indicates a second code point (01) indicating that only scheduling information for paging exists in the DCI, and when the values ​​of SM of [Table 3] are set to 1 indicating a change in SIB (System Information Block) settings, it is proposed that an SBFD-aware UE processes this as indicating a change in SBFD settings.

[0081] The comparison of Method 2 and Method 3 described above is as follows.

[0082] In the case of method 2, the SM corresponding to bit 1 indicates a change in SIB settings for legacy UEs, and an embodiment can be seen in which one or more of bits 3 to 8 are used to separately indicate information indicating that the settings for SFBD have been changed.

[0083] In contrast, in the case of method 3, it can be seen as an example of an embodiment that provides instruction information to be commonly used when the SM content corresponding to bit 1 is changed in the system information (SI) for legacy UEs or when the SFBD-related setting information is changed.

[0084]

[0085] Meanwhile, in another embodiment of the present invention (method 4), when the DCI internal SMI is set to '01' and a code point corresponding to bit 1 indicating a change in SIB among paging-related SMs is received, if the bit is '1', the existing definition is followed, and if the bit is '0', the SFBD-related setting information is defined as changed and can be operated.

[0086] In addition, in another embodiment of the present invention (method 5), when the DCI internal SMI is set to '01' and a code point corresponding to bit 2 indicating a change in SIB among paging-related SMs is received, if the bit is '1', the existing definition is followed, and if the bit is '0', the SFBD-related setting information is defined as changed and can be operated.

[0087]

[0088] A UE that has obtained SBFD setting change information through a paging message as described above can perform preamble transmission for random access based on this (S650).

[0089] Random access that can be performed by a UE that has received SBFD configuration change information in this way can be applied to various types of random access, and the types of random access are described below.

[0090]

[0091] Random access type

[0092] Figures 7 and 8 are drawings specifically explaining the procedures and each message of CBRA and CFRA.

[0093] Figures 7 and 8 illustrate the concepts of contention-based random access (CBRA) (710, 810) and contention-free random access (CFRA) (720, 820), respectively, in the process of performing random access between a typical UE and a base station (gNB) of LTE and NR.

[0094] First, there are the following cases where the UE performs random access.

[0095] - When the UE makes an initial access without an RRC connection with the base station.

[0096] - When the UE first connects to the target cell during the handover process.

[0097] - When a random access process is requested by a command from the base station

[0098] - When data to be transmitted through uplink occurs in a situation where the uplink time synchronization is not correct or the designated radio resources used to request radio resources are not allocated.

[0099] - When performing a recovery process in case of radio link failure or handover failure

[0100]

[0101] LTE and NR systems provide both the CBRA procedure, in which a UE randomly selects a preamble from a specific set, and the CFRA procedure, in which the base station uses a random access preamble allocated only to a specific UE. However, the CFRA procedure can only be used during the aforementioned handover process or when requested by a base station command.

[0102] Referring to drawing symbol 720 of FIG. 7, the CFRA procedure can be performed as follows.

[0103] (1) Random access preamble allocation (step 0)

[0104] As described above, the CFRA procedure can be performed (1) during a handover process and (2) when requested by a base station command. Of course, the CBRA procedure can also be performed in both of the above cases.

[0105] First, for the CFRA procedure, it is crucial to receive a designated random access preamble from the base station that is collision-free. Methods for receiving this random access preamble include a handover command and a PDCCH command. Through these methods, the UE is assigned a random access preamble.

[0106] (2) Transmitting the first message (Step 1)

[0107] After the UE is assigned a random access preamble designated only to itself by the base station as described above, the UE transmits the preamble to the base station.

[0108] (3) Receiving the second message (Step 2)

[0109] After the UE transmits the random access preamble as described in step 1 above, the base station attempts to receive its own random access response within the random access response reception window indicated by the system information or handover command. More specifically, the random access response information may be transmitted in the form of a MAC Packet Data Unit (MAC PDU), and the MAC PDU may be transmitted through a Physical Downlink Shared Channel (PDSCH). In addition, it is preferable that the UE monitor the Physical Downlink Control Channel (PDCCH) so that the UE can properly receive the information transmitted through the PDSCH. That is, the PDCCH preferably includes information on the UE that must receive the PDSCH, frequency and time information of the radio resources of the PDSCH, and a transmission format of the PDSCH. Once the UE successfully receives the PDCCH transmitted to itself, it can properly receive the random access response transmitted through the PDSCH according to the information of the PDCCH. And the random access response may include a random access preamble identifier (ID; for example, RA-RNTI (Random Access Radio Network Temporary Identifier)), an uplink grant (UL Grant) indicating uplink radio resources, a temporary cell identifier (Temporary C-RNTI), and a time synchronization correction value (Timing Advance Command: TAC).

[0110] As described above, the reason why a random access preamble identifier is required in a random access response is because one random access response may include random access response information for one or more UEs, and thus it is necessary to indicate to which UE the UL Grant, temporary C-RNTI, and TAC are valid. In this step, it is assumed that the UE selects a random access preamble identifier that matches the random access preamble it selected in step S402.

[0111] In the CFRA procedure, by receiving random access response information, it is determined that the random access process has been performed normally and the random access process can be terminated.

[0112]

[0113] However, as described above, the CFRA procedure can be performed in limited circumstances, and generally can be performed through the CBRA procedure as illustrated in drawing reference numeral 710 of FIG. 7.

[0114] The process of a UE performing random access with a specific base station according to the CBRA procedure may largely include, as shown in reference numeral 710 of FIG. 7, (1) a step of transmitting a random access preamble by the UE to the base station (hereinafter, a "first message (message 1)" transmission step if there is no confusion), (2) a step of receiving a random access response from the base station in response to the transmitted random access preamble (hereinafter, a "second message (message 2)" reception step if there is no confusion), (3) a step of transmitting an uplink message using information received in the random access response message (hereinafter, a "third message (message 3)" transmission step if there is no confusion), and (4) a step of receiving a message corresponding to the uplink message from the base station (hereinafter, a "fourth message (message 4)" reception step if there is no confusion).

[0115] (1) Sending the first message (Step 1)

[0116] First, the UE can randomly select one random access preamble from a set of random access preambles indicated through system information or a handover command, and select a PRACH (Physical RACH) resource capable of transmitting the random access preamble to transmit it (step 1).

[0117] (2) Receiving the second message (Step 2)

[0118] The method for receiving random access response information is similar to the CFRA procedure described above. That is, after transmitting the random access preamble as in step 1, the UE attempts to receive its own random access response within the random access response reception window indicated by the base station through system information or a handover command, and receives the PDSCH through the corresponding RA-RNTI information (step 2). Through this, an uplink grant (UL Grant), a temporary cell identifier (Temporary C-RNTI), and a time synchronization correction value (Timing Advance Command: TAC) can be received.

[0119] (3) Sending the third message (Step 3)

[0120] When the UE receives a valid random access response, it processes the information contained in the random access response. That is, the UE applies the TAC and stores the temporary C-RNTI. In addition, it transmits data (i.e., the third message) to the base station using the UL grant (step 3). The third message must include the UE identifier. In the CBRA procedure, the base station cannot determine which UEs are performing the random access process, because the UEs must be identified for later collision resolution.

[0121] Two methods have been discussed for including the UE's identifier. In the first method, if the UE already had a valid cell identifier assigned to the cell prior to the random access procedure, the UE transmits its cell identifier via the uplink transmission signal corresponding to the UL grant. On the other hand, if the UE was not assigned a valid cell identifier prior to the random access procedure, the UE transmits its own unique identifier (e.g., S-TMSI or Random Id). Typically, the unique identifier is longer than the cell identifier. If the UE transmits data corresponding to the UL grant, it starts a timer for contention resolution (contention resolution timer).

[0122] (4) Receiving the 4th message (Step 4)

[0123] After the UE transmits data including its own identifier via the UL grant included in the random access response, it waits for instructions from the base station for collision resolution. That is, it attempts to receive the PDCCH to receive a specific message (step 4). Two methods have been discussed for receiving the PDCCH. As mentioned above, if the third message transmitted in response to the UL grant uses its own cell identifier as its identifier, it attempts to receive the PDCCH using its own cell identifier, and if the identifier is a unique identifier, it may attempt to receive the PDCCH using the temporary C-RNTI included in the random access response. In the former case, if the PDCCH is received via its own cell identifier before the collision resolution timer expires, the UE determines that the random access procedure has been performed normally and terminates the random access procedure. In the latter case, if the PDCCH is received via the temporary C-RNTI before the collision resolution timer expires, the UE checks the data transmitted by the PDSCH indicated by the PDCCH. If the content of the above data includes its own unique identifier, the UE determines that the random access process has been performed normally and terminates the random access process.

[0124]

[0125] Meanwhile, drawing reference numeral 810 of FIG. 8 illustrates the concept of a two-stage CBRA that is distinct from the four-stage CBRA described above with reference to drawing reference numeral 710 of FIG. 7.

[0126] This two-step random access is a random access process introduced in Release 16 of NR, and as illustrated in FIG. 8, the message A initially transmitted by the UE to the base station is characterized by being transmitted including the first message and the third message in the four-step random access of reference numeral 710 of FIG. 7 (step A).

[0127] Additionally, in the two-step random access process, the base station may respond to the UE with message B, which is characterized in that it is transmitted including the second message and the fourth message in the four-step random access of the drawing reference numeral 710 of FIG. 7 (step B).

[0128] Additionally, the drawing reference numeral 820 of FIG. 8 illustrates a CFRA procedure based on a two-step random access of the drawing reference numeral 810, which is distinct from the three-step CFRA described above with respect to the drawing reference numeral 720 of FIG. 7.

[0129] In this case, message A is the same as the case of the two-step random access of drawing number 810 of FIG. 8 in that it is transmitted in a combined form of the first message and the third message of CFRA of drawing number 720 of FIG. 7.

[0130]

[0131] Legacy TDD UL-DL configuration-based behavior

[0132] FIGS. 9 to 11 are diagrams for explaining a legacy TDD UL-DL configuration-based operation method that takes into account the possibility of changing SBFD settings according to another embodiment of the present invention.

[0133] As described above with reference to FIGS. 5 and 6, an SBFD-aware UE can obtain SBFD configuration change information through a paging message. In this case, in one embodiment of the present invention, as illustrated in FIG. 9, in the case of an SFBD-aware UE (S1010), random access is proposed to be performed (S1030) based on legacy SIB configuration information upon receiving the above-described paging signal.

[0134] And / or, when the SFBD-aware UE transitions from the RRC_IDLE / INACTIVE state to the RRC_CONNECTED state (S1020), performing random access in the SFBD symbol may be prohibited. In addition, all random access operations may be operated according to the existing legacy random access-related operation procedures, i.e., according to the legacy TDD UL-DL configuration (S1030).

[0135] This behavior can also be applied in a situation where a UE in RRC_INACTIVE state transmits data to the network, as illustrated in FIG. 10.

[0136] Specifically, when an SBFD-aware UE in an INACTIVE state has data to transmit to a network (gNB), it can transmit an RRC restart request message (S1010), receive an RRC restart message (S1020), transmit an RRC restart complete message (S1030), and transmit data to the network (S1040) as illustrated in FIG. 10. Thereafter, an RRC release message can be received for the UE (S1050).

[0137] In one embodiment of the present invention, in such a situation, since there is a possibility of changing the SBFD-related settings, signaling in the data transmission operation procedure in RRC_INACTIVE can be set and operated to operate based on the legacy TDD UL-DL slot configuration.

[0138] That is, actions based on SFBD settings may be prohibited.

[0139]

[0140] Meanwhile, the operation as described above can also be applied to the SDT (Small Data Transmission) operation by the UE in the INACTIVE state as shown in FIG. 11.

[0141] Specifically, 1110 of FIG. 11 shows a process of performing SDT in a two-step random access procedure, and 1120 of FIG. 11 shows a process of performing SDT in a four-step random access procedure.

[0142] According to the present embodiment, since there is a possibility of SBFD-related settings changing when an SBFD-aware UE in the INACTIVE state performs an SDT operation, it is proposed to set and operate signaling in the data transmission operation procedure in RRC_INACTIVE to operate based on legacy random access-related settings. In other words, operations based on SFBD settings can be prohibited.

[0143]

[0144] Figure 12 illustrates a wireless device to which the present technology can be applied.

[0145] Referring to FIG. 12, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, the first wireless device (100) and the second wireless device (200) can correspond to the UE (510) and the network (520) of FIG. 5, respectively.

[0146] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0147] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may store software code including commands for performing some or all of the processes controlled by the processor (202) or for performing the descriptions, functions, procedures, proposals, methods and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE E-UTRA, 5G NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0148] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0149] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0150] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0151] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0152]

[0153] The detailed description of the preferred embodiments of the present invention disclosed above has been provided to enable those skilled in the art to implement and practice the present invention. While the above description has been made with reference to preferred embodiments of the present invention, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the scope of the present invention. For example, those skilled in the art can utilize the individual components described in the above-described embodiments in combination with each other.

[0154] Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0155] The SBFD-related setting change according to the embodiments of the present invention as described above and the random access method of the UE according to the change and the device therefor are suitable for use in the SBFD-related communication environment of the 5G system in 3GPP, but can also be used in the same manner in the 6G of 3GPP and the next-generation mobile communication system thereafter.

Claims

1. In a method for a user equipment (UE) to perform random access to a network in a mobile communication system, Receive a paging message from the above network, The above paging message includes DCI (Downlink Control Information) in a predetermined format, The above DCI provides information on changes to Full Duplex (FD) related settings; and Based on the above FD related setting change information, including performing random access to the network, How to perform random access.

2. In paragraph 1, The above UE is a UE in RRC_IDLE or RRC_INACTIVE mode, How to perform random access.

3. In paragraph 1, The first codepoint of the SMI (Short Message Indicator) of the above DCI indicates a change in the FD-related settings. How to perform random access.

4. In paragraph 1, The SMI (Short Message Indicator) of the above DCI represents a second code point indicating that only scheduling information for paging exists in the above DCI. The SM (Short Message) of the above DCI instructs to change the FD-related settings. How to perform random access.

5. In paragraph 4, If the above SM indicates a change in the SIB (System Information Block) settings, the UE processes it as indicating a change in the FD-related settings. How to perform random access.

6. In paragraph 4, If the SM has a second value different from the first value indicating a change in the SIB (System Information Block) setting, the UE processes it as indicating a change in the FD-related setting. How to perform random access.

7. In paragraph 1, The FD-related setting change information is transmitted through the downlink shared channel scheduled by the DCI. How to perform random access.

8. In paragraph 1, The above FD related setting information includes SBFD (Sub-Band Full Duplex) related setting information. How to perform random access.

9. In paragraph 8, Performing the above random access is: Considering the change in the above SBFD related setting information, performed through the SBFD symbol, How to perform random access.

10. In paragraph 8, Performing the above random access is: Performed through symbols other than the SBFD symbol, How to perform random access.

11. In a method for a user equipment (UE) to perform random access to a network in a mobile communication system, If the UE is a SBFD (Sub-Band Full Duplex) UE and the UE performs random access to the network in the RRC_INACTIVE state, The above random access includes performing it based on TDD (Time Division Duplex) UL (Uplink) -DL (Downlink) configuration information regardless of the SBFD setting. How to perform random access.

12. In paragraph 11, When the UE performs SDT (Small Data Transmission), the SDT is performed based on the TDD UL-DL configuration information regardless of the SBFD setting. How to perform random access.

13. In a method for a network to assist random access of a user equipment (UE) in a mobile communication system, Transmit a paging message to the UE, The above paging message includes DCI (Downlink Control Information) in a predetermined format, The above DCI provides information on changes to Full Duplex (FD) related settings; and Based on the above FD related setting change information, including responding to the random access of the UE, Random access assist method.

14. In a user equipment (UE) performing random access to a network in a mobile communication system, at least one processor; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Receive a paging message from the above network, The above paging message includes DCI (Downlink Control Information) in a predetermined format, The above DCI provides information on changes to Full Duplex (FD) related settings; and Based on the above FD related setting change information, including performing random access to the network, User device.

15. In a network that assists random access of a user equipment (UE) in a mobile communication system, at least one processor; and At least one computer memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform operations; The above actions are, Transmit a paging message to the UE, The above paging message includes DCI (Downlink Control Information) in a predetermined format, The above DCI provides information on changes to Full Duplex (FD) related settings; and Based on the above FD related setting change information, including responding to the random access of the UE, network.

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