Physical random access channel (PRACH) for sub-band full duplex operation

Abstract

A method, a network node and a wireless device (WD) for a physical random access channel (PRACH) for sub-band full duplex operation are disclosed. According to one aspect, a wireless device (22) configured to communicate with a network node (16) is provided. The wireless device (22) is configured to receive frequency domain configuration information and time domain configuration information indicating a plurality of subband full duplex (SBFD) symbols and a plurality of uplink only (UL) symbols in a time division duplex (TDD) configuration, and determine validity of a random access channel (RACH) occasion (RO) based on whether a validity condition is satisfied, the RO is located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols.

Description

Technical Field

[0001] The present disclosure relates to wireless communications, and in particular to a physical random access channel for sub-band full-duplex operation. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has developed and is developing standards for the 4th (4G) (also known as Long Term Evolution (LTE)) and 5th (5G) (also known as New Radio (NR)) wireless communication systems. Such systems provide, among other features, broadband communications between network nodes (such as base stations) and mobile wireless devices (WDs), as well as communications between network nodes and between WDs. The 6th (6G) wireless communication systems are also under development.

[0003] 3GPP NR can be designed to provide services for multiple use cases, such as enhanced mobile broadband (eMBB), ultra-reliable and low-latency communication (URLLC), and machine-type communication (MTC). Each of these services has different technical requirements. For example, the general requirement for evolved mobile broadband (eMBB) is high data rate with medium latency and medium coverage, while ultra-reliable and low-latency (URLLC) services require low latency and high reliability of transmission, but may require medium data rates.

[0004] One of the solutions for low-latency data transmission is to use shorter transmission time intervals. In NR, in addition to transmitting in time slots, mini-time slot transmission is also allowed to reduce latency. Figure 1 As shown, a mini-slot may include any number of orthogonal frequency division multiplexing (OFDM) symbols from 1 to 14. It should be noted that the concepts of slots and mini-slots are not specific to a particular service, which means that a mini-slot may be used for eMBB, URLLC or other services.

[0005] In 3GPP Technology Release 15 (3GPP Rel-15) NR, a WD can configure up to four carrier bandwidth parts in the downlink, where a single downlink carrier bandwidth part is active at a given time. A WD can configure up to four carrier bandwidth parts in the uplink, where a single uplink carrier bandwidth part is active at a given time.

[0006] A 3GPP NR slot consists of a number of OFDM symbols. According to the current protocol, for OFDM subcarrier spacing ≤ 60kHz, a slot consists of 7 or 14 symbols, and for OFDM subcarrier spacing > 60kHz, a slot consists of 14 symbols. Figure 2 A subframe with 14 OFDM symbols is shown. Figure 2 In, T s and T symbdenote the time slot and OFDM symbol duration respectively.

[0007] Transmissions and receptions from nodes (e.g., terminals in a cellular system) can be multiplexed in the frequency domain or the time domain (or a combination thereof). Figure 3 Frequency division duplexing (FDD), shown on the left in the figure, implies that downlink and uplink transmissions occur in different, well-separated frequency bands. Figure 3 As shown in the right side of the figure, time division duplexing (TDD) implies that downlink and uplink transmissions occur in different, non-overlapping time slots. Therefore, TDD can operate in unpaired spectrum, while FDD requires paired spectrum.

[0008] Typically, the structure of signals transmitted in a communication system is organized in the form of a frame structure. Figure 4 As shown, with 15kHz subcarrier spacing, NR uses ten equally sized slots per radio frame.

[0009] For FDD operation ( Figure 4 There are two carrier frequencies, one for uplink transmission (f UL ), and one for downlink transmission (f DL ). At least for terminals in cellular communication systems, FDD can be full-duplex or half-duplex. In the full-duplex case, the terminal can transmit and receive simultaneously, while in half-duplex operation, the terminal cannot transmit and receive simultaneously (although the base station can receive and transmit simultaneously, for example, receiving from one terminal while transmitting to another terminal). In LTE, half-duplex terminals monitor and receive in the downlink unless explicitly instructed to transmit in a certain subframe.

[0010] For TDD operation ( Figure 4 In the case of NR, there is only a single carrier frequency, and uplink and downlink transmissions are always separated in time and on a cell basis. Since the same carrier frequency is used for uplink and downlink transmissions, both the base station and the mobile terminal need to switch from transmission to reception and vice versa. One aspect of any TDD system is the possibility to provide a sufficiently large guard time, during which neither downlink nor uplink transmissions occur. This is required to avoid interference between uplink and downlink transmissions. For NR, this guard time is provided by special subframes, which are divided into three parts: symbols for DL, guard period (GP), and symbols for uplink. The remaining subframes are allocated to uplink or downlink transmissions.

[0011] In more detail, the following two information elements (IEs) are defined in the current specification. The TDD mode is usually configured with at least a first IE and optionally a second IE: ● TDD-DL-UL-ConfigCommon (cell specific); and ●TDD-DL-UL-ConfigDedicated (UE specific).

[0012] The first IE is cell-specific (common to all WDs) and is provided by broadcast signaling. It provides the number of slots in TDD mode via the reference subcarrier spacing and periodicity, so that the S slot pattern repeats every S slots. This IE allows very flexible configuration of modes characterized by one or more of the following parameters: A number of full downlink slots at the beginning of the pattern configured by the parameter nDownlinkSlots; ● a number of full uplink timeslots at the end of the pattern configured by parameter nUplinkSlots; ● a number of downlink ('D') symbols following a complete downlink timeslot configured by the parameter nDownlinkSymbols; ● a number of uplink ('U') symbols preceding a full downlink slot configured by the parameter nUplinkSlots; ● If there is a gap between the last downlink symbol and the first uplink symbol, all symbols in the gap are characterized as flexible ('F'). Symbols classified as 'F' can be used for either downlink or uplink. WD determines the direction in one of two ways: o Detecting downlink control information (DCI) of a scheduling / triggering DL signal / channel (e.g., PDSCH, CSI-RS) or a scheduling / triggering UL signal / channel (e.g., PUSCH, SRS, etc.); and / or o Dedicated (WD-specific) signaling via IE TDD-DL-UL-ConfigDedicated. This parameter overrides some or all 'F' symbols in the pattern, providing a semi-static indication of whether a symbol is classified as 'D' or 'U'; and / or - Optionally, a second mode cascaded to the first mode may be configured as above. If a second mode is configured, the constraint is that the sum of the periodicities of the two modes must be divided by 20ms on average.

[0013] Figure 5 An example TDD DL / UL pattern configured by TDD-DL-UL-ConfigCommon is shown. It includes 3 full 'D' slots and 1 full 'U' slot, with a mixed slot in the middle that includes 4 'D' symbols and 3 'U' symbols. The remaining 7 symbols in the mixed slot are classified as 'F'.

[0014] Still refer to Figure 5, if the WD is not configured with TDD-DL-UL-ConfigDedicated, the mode at the top of the figure is assumed. As described above, the network can flexibly utilize the 'F' symbol by scheduling or triggering uplink or downlink signals and / or channels in a WD-specific manner. This allows for very dynamic behavior. The WD does not know the direction in advance; instead, once the WD detects the DCI that schedules / trigger a specific DL or UL signal / channel, the direction becomes known.

[0015] In contrast, the DL / UL direction of some or all 'F' symbols in a specific slot may be provided to the WD in a semi-static manner through Radio Resource Control (RRC) signaling that configures the WD with TDD-DL-UL-ConfigDedicated. Figure 5 The lower part of shows 3 example configurations for overwriting the 'F' symbols in slot 3. If the IE indicates 'all Downlink' or 'all Uplink' for a particular slot (or slots), all 'F' symbols in the slot are converted to 'D' or 'U', respectively. If the IE indicates 'explicit', multiple symbols at the beginning of the slot and / or multiple symbols at the end of the slot are indicated as 'D' and 'U', respectively. In the example below, the first 7 and the last 5 are indicated as 'D' and 'U', for example, which converts some 'F' symbols to 'D' and 'U'.

[0016] The above behavior is that the WD-specific IE TDD-DL-UL-ConfigDedicated may only overwrite (i.e. assign 'D' or 'U') symbols configured as 'F' by the cell-specific IE TDD-DL-UL-ConfigCommon. In other words, the WD does not want to convert 'D' symbols to 'U' or vice versa.

[0017] Figure 6Three additional example TDD DL / UL modes configured by TDD-DL-UL-ConfigCommon are shown. In the first and second modes, there is no 'F' symbol. Therefore, according to the current behavior in the 3GPP Rel-17 specification, the WD will not expect to configure TDD-DL-UL-ConfigDedicated. In the second mode, all symbols in slots 1, 2 and 3 are configured as 'F'. Therefore, the WD can be configured with TDD-DL-UL-ConfigDedicated, providing a direction ('D' or 'U') for any or all symbols in these 3 slots. Note that the current (3GPP Rel-17) specification allows TDD modes to be configured specifically on a slot-specific basis. In other words, TDD-DL-UL-ConfigDedicated is not limited to being the same in each slot overwriting the 'F' symbol. Sub-band full-duplex

[0018] As mentioned above, in a conventional TDD system, the entire carrier BW or all carriers in the same frequency band need to use the same DL transmission or UL reception direction. Figure 7 Further shown in .

[0019] For the 3GPP Rel-18 evolution of the NR system, 3GPP has decided to study the technical feasibility and potential advantages of the sub-band full-duplex (SBFD) system.

[0020] In such a system, a portion of a broadband carrier wave can be used in a direction different from that of the rest of the carrier wave. Figure 8 That is, Figure 7 Unlike the conventional TDD system shown on the left (in which the entire bandwidth in the first three time slots is used for DL ​​transmission), the central portion of the SBFD carrier is used for UL reception, while the rest of the carrier continues to be used for DL ​​transmission, as shown in FIG. Figure 8 as shown on the left.

[0021] Similarly, replacing Figure 7 In the conventional TDD system shown on the right, all carriers are used in the same DL or UL direction. In the SBFD system, some carriers can be used in directions different from other carriers, such as Figure 8 Shown on the right.

[0022] In 3GPP Rel-18 studies, the range has been restricted so that in sub-band frequency domain (SBFD) operation, only network nodes (e.g. gNBs) transmit downlink (DL) and receive uplink (UL) simultaneously. Only a single WD is scheduled in one direction (DL or UL) at a time.

[0023] A method for configuring one or more OFDM symbols of a time slot with two or more resource block (RB) sets has been disclosed, wherein each RB set corresponds to a frequency domain subband and has a defined transmission direction ('D' or 'U'). The RB sets may have gaps between them, used as guard bands where neither DL or UL transmission occurs. Fig. 9 and Fig.10 Two example RB set configurations are shown, one with a DUD configuration and the other with a UDU configuration. RB sets are configured by introducing new (one or more) RRC parameters or enhancing existing RRC parameters (e.g., TDD-UL-DL-ConfigDedicated). In either case, the (one or more) parameters signal the size and frequency domain location of the RB set, as well as which symbols / slots in the TDD UL / DL mode are configured with the RB set. Advanced Antenna Arrays for TDD Systems

[0024] Modern cellular wireless communication systems utilize advanced antenna array systems to perform beamforming and multiple-input multiple-output (MIMO) transmission to enhance the coverage and throughput of the system. Fig.11 A general example antenna array for a TDD system is shown in . In this example array, multiple antenna elements are used and are typically placed in a planar array with horizontal and vertical spacing appropriate for the operating frequency band. For a TDD base station, the antenna array is connected to a TX / RX switch so that the same antenna array can be used to transmit DL signals in a DL timeslot and also to receive UL signals in a UL timeslot. Antenna Architecture of SBFD System I

[0025] In a SBFD system, the base station will need to perform DL transmission and UL reception simultaneously. Fig.12 As shown, it is necessary to use two antenna arrays in two directions: ● The first antenna array is used for UL reception only; and ●The second antenna array is used for DL ​​transmission only.

[0026] It is also usually necessary to introduce additional isolation material or mechanism between the two antenna arrays to suppress signal leakage from the TX array into the RX array. Without such isolation, the UL receiver may be desensitized due to the fact that the DL transmit power is usually much higher than the UL receive power. PRACH Configuration

[0027] An example physical random access channel (PRACH) configuration according to the existing (3GPP Rel-17) specification is described here. The example is for frequency range 1 (FR1) of non-paired spectrum and uses PRACH configuration index 118 of 3GPP Rel-17 from 3GPP Technical Standard (TS) 38.211, as shown below: Table 6.3.3.2-3: Random access configuration for FR1 and non-paired spectrum

[0028] Fig.13 An example PRACH configuration assuming a PRACH SCS of 30kHz is shown. The value x=2 in Table 6.3.3.2-3 above indicates that the PRACH configuration period is 2 radio frames (20ms), and the value y=1 indicates that the RACH opportunity (RO) occurs in the second frame of the period. Within this frame, the RO appears in subframes 2, 3, 4, 7, 8, and 9. In the case of 30kHz SCS, there are two slots per subframe. Since the number of PRACH slots within a subframe is equal to 1 for this example, the second slot of the subframe contains the RO according to the current specification. This means that the RO is contained in slots 5, 7, 9, 15, 17, and 19. In this example, PRACH format A3 (6 symbol duration) is used. Therefore, starting from symbol 0 of the slot, there are two back-to-back ROs per slot.

[0029] For this example, assume that the cell-specific (common) TDD UL / DL mode is DDDDU, which is also Fig.13 In the existing 3GPP TS 38.213 specification, according to the following text excerpt, if the RACH opportunity is within a UL symbol, the WD assumes that the RACH opportunity is valid: [3GPP TS 38.213 Section 8.1] For the unpaired spectrum, - If WD does not provide tdd-UL-DL-ConfigurationCommon, then if a PRACH opportunity in a PRACH slot does not precede an SS / PBCH block in the PRACH slot and the PRACH opportunity starts at least N after the last SS / PBCH block received symbol gap symbols (where N gap Provided in Table 8.1-2), and if channelAccessMode="semiStatic" is provided, the PRACH opportunity does not overlap with a set of consecutive symbols before the start of the next channel occupancy time in which the WD does not transmit [15, TS 37.213], then the PRACH opportunity is valid. -The candidate SS / PBCH block index of the SS / PBCH block corresponds to the SS / PBCH block index provided by SIB1 or ssb-PositionsInBurst in ServingCellConfigCommon, as described in clause 4.1. If WD is provided with tdd-UL-DL-ConfigurationCommon, the PRACH opportunities in the PRACH slot are valid in the following cases: - The PRACH opportunity is within a UL symbol, or - The PRACH opportunity does not precede an SS / PBCH block in a PRACH slot and the PRACH opportunity starts at least N after the last downlink symbol gap symbols and starts at least N after the last SS / PBCH block symbol gap symbols (where N gap Provided in Table 8.1-2), and if channelAccessMode="semiStatic" is provided, this PRACH opportunity does not overlap with a set of consecutive symbols before the start of the next channel occupancy time when there should not be any transmission (as described in [15, TS 37.213]) -The candidate SS / PBCH block index of the SS / PBCH block corresponds to the SS / PBCH block index provided by SIB1 or ssb-PositionsInBurst in ServingCellConfigCommon, as described in clause 4.1.

[0030] Using DDDDU mode, it turns out that only slots 9 and 19 contain valid ROs. Fig.13 As shown by the X in , the ROs in the time slots 5, 7, 15 and 17 are invalid.

[0031] According to 3GPP TS38.331, ROs are configured in the frequency domain via two parameters: msg1-FDM, which indicates the number of ROs (1, 2, 4 or 8) in the frequency domain within an OFDM symbol; and msg1-FrequencyStart, which indicates the lowest-indexed RB in the active BWP of the first RO in the frequency domain.

[0032] According to 3GPP TS 38.331, a configurable number of SSBs are mapped to ROs defined in the time and frequency domains. This is controlled by the RRC parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB as shown below:

[0033] The values ​​1 / 8, 1 / 4 or 1 / 2 mean that 1 SSB is mapped to 8, 4 or 2 consecutive ROs, respectively. The values ​​1, 2, 4, 8 or 16 mean that 1, 2, 4, 8 or 16 SSBs are mapped to a single RO, respectively. The order of SSB to RO mapping is defined in 3GPP TS38.213 section 8.1, according to the following text excerpt: [3GPP TS38.213 Section 8.1] The SS / PBCH block index provided by ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon is mapped to valid PRACH opportunities in the following order, where the parameters are described in [4, 3GPP TS38.211]. - First, within a single PRACH opportunity, in order of increasing preamble index; - Second, for frequency reused PRACH opportunities, in order of increasing frequency resource index; - Third, within the PRACH time slot, the order of increasing time resource index of the time-multiplexed PRACH opportunities; - Fourth, for PRACH slots, in order of increasing index.

[0034] Essentially, mapping is performed based on the effective RO and follows the order of frequency first, time second. For example, using the above PRACH configuration example with the following additional configuration: 8 SSBs; msg1-FDM=4; and ●ssb-perRACH-OccasionAndCB-PreamblesPerSSB='one' produce Fig.14 SSB-RO mapping shown.

[0035] In this example, the association period is equal to 1, i.e., a complete cycle of the SSB index occurs within a single PRACH configuration period. Preamble code receiving target power

[0036] In 3GPP TS38.331, the preamble received target power is configured via the parameter preambleReceivedTargetPower, which indicates the target power level on the receiver side.

[0037] According to 3GPP TS38.213, the WD then uses this parameter together with the path loss estimation and maximum output power calculation of the transmission power of the Physical Random Access Channel (PRACH).

[0038] In the latest (3GPP Rel-17) specifications, SBFD operation, which is characterized by providing UL resources within symbols that the gNB also uses for DL ​​transmissions, is not supported. For the case of PRACH, the specifications only support PRACH transmissions in UL-only symbols. Summary of the invention

[0039] Some embodiments advantageously provide methods, network nodes, and wireless devices (WDs) for a physical random access channel for sub-band full-duplex operation.

[0040] Some embodiments include methods for enabling PRACH transmission in both UL-only symbols and SBFD symbols containing UL frequency subbands, where UL frequency domain resource availability is different in the two symbol types. Different methods for (1) determining and / or configuring RACH opportunity (RO) validity, (2) mapping SSB indexes to RO, and (3) determining / configuring preamble reception target power are disclosed.

[0041] Various methods for determining / configuring RACH occasion (RO) validity are disclosed. Some embodiments provide an implicit method for RO validity determination that extends the current process to include frequency domain conditions. Frequency domain ROs are valid if they are fully contained within the UL subband. Frequency domain ROs that are not fully contained within the UL subband are considered invalid. Some embodiments provide methods that enable separate configuration of the number of ROs and their frequency domain locations in SBFD symbols and UL-only symbols.

[0042] Some embodiments provide methods of mapping SSB indices to valid ROs. In some embodiments, continuous mapping is performed in a frequency first / time second manner on all ROs regardless of symbol type (SBFD symbols or UL-only symbols). In some embodiments, separate mapping is performed in different symbol types to ensure that all SSB indices are mapped to ROs in both UL-only symbols and SBFD symbols to maximize robustness.

[0043] Some embodiments provide a method for configuring a preamble reception target power of a RO in a SBFD symbol.

[0044] An advantage of enabling PRACH transmission in both UL-only symbols and SBFD symbols is increased RACH capacity or reduced RACH delay, or both, compared to a system where UL resources are available in UL-only symbols.

[0045] According to one aspect of the present disclosure, a wireless device configured to communicate with a network node is provided. The wireless device is configured to: receive frequency domain configuration information and time domain configuration information, wherein the frequency domain configuration information and the time domain configuration information indicate a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration; and determine the validity of a random access channel RACH opportunity RO based on whether a validity condition is met, wherein the RO is located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL only symbol of the plurality of UL only symbols.

[0046] According to one or more embodiments of this aspect, the validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or within the at least one UL-only symbol.

[0047] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0048] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0049] According to one or more embodiments of this aspect, the wireless device is further configured to receive a first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

[0050] According to one or more embodiments of this aspect, the wireless device is further configured to receive a second parameter indicating a resource block RB start index of the RO in the frequency domain within the at least one SBFD symbol.

[0051] According to one or more embodiments of this aspect, the first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

[0052] According to one or more embodiments of this aspect, the first parameter and the second parameter are only applicable to the at least one SBFD symbol and not to the at least one UL-only symbol.

[0053] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0054] According to one or more embodiments of this aspect, the wireless device is further configured to determine an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0055] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

[0056] According to one or more embodiments of this aspect, the wireless device is also configured to determine the starting RB during the at least one SBFD symbol based on at least one of the following: the starting RB of the starting RO in the at least one UL-only symbol; and the starting RB of the UL subband in the at least one SBFD symbol.

[0057] According to one or more embodiments of this aspect, the first parameter and the second parameter are parameters used to respectively indicate the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and the wireless device is also configured to reposition at least one RO from outside the frequency bandwidth associated with the UL subband of the at least one SBFD symbol to inside the frequency bandwidth.

[0058] According to one or more embodiments of this aspect, the first parameter and the second parameter are received via one of radio resource control RRC signaling or system information SI signaling.

[0059] According to one or more embodiments of this aspect, the wireless device is also configured to map multiple SSBs to multiple valid ROs that satisfy the validity condition, wherein the multiple valid ROs include all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes mapping the SSBs in a continuous manner in an order of increasing SSB index to valid ROs in an order of increasing frequency and then in an order of increasing time.

[0060] According to one or more embodiments of this aspect, the wireless device is also configured to map multiple SSBs to multiple valid ROs that satisfy the validity condition, wherein the multiple valid ROs include all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, wherein the first mapping is configured to map the SSBs to valid ROs within only the multiple UL-only symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in an order of increasing SSB index; and a second mapping, wherein the second mapping is configured to map the SSBs to valid ROs within only the multiple SBFD symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in an order of increasing SSB index.

[0061] According to one or more embodiments of this aspect, the wireless device is further configured to receive an indication of a preamble reception target power for at least one RO in the at least one SBFD symbol.

[0062] According to one or more embodiments of this aspect, the wireless device is further configured to receive an indication of an offset preamble reception target power for at least one RO in the at least one SBFD symbol.

[0063] According to one or more embodiments of this aspect, the wireless device is further configured to transmit Physical Random Access Channel PRACH signaling in at least the RO.

[0064] According to another aspect of the present disclosure, a method implemented by a wireless device configured to communicate with a network node is provided. Frequency domain configuration information and time domain configuration information are received, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration. The validity of a random access channel RACH opportunity RO is determined based on whether a validity condition is satisfied, the RO being located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL only symbol of the plurality of UL only symbols.

[0065] According to one or more embodiments of this aspect, the validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or within the at least one UL-only symbol.

[0066] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0067] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0068] According to one or more embodiments of this aspect, a first parameter is received, the first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

[0069] According to one or more embodiments of this aspect, a second parameter is received, the second parameter indicating a resource block RB start index of the RO in the frequency domain within the at least one SBFD symbol.

[0070] According to one or more embodiments of this aspect, the first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

[0071] According to one or more embodiments of this aspect, the first parameter and the second parameter are only applicable to the at least one SBFD symbol and not to the at least one UL-only symbol.

[0072] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0073] According to one or more embodiments of this aspect, an RB offset is determined relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0074] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

[0075] According to one or more embodiments of this aspect, the starting RB during the at least one SBFD symbol is determined based on at least one of: the starting RB of the starting RO in the at least one UL-only symbol; and the starting RB of the UL subband in the at least one SBFD symbol.

[0076] According to one or more embodiments of this aspect, the first parameter and the second parameter are parameters used to respectively indicate the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and wherein at least one RO is relocated from outside the frequency bandwidth associated with the UL subband of the at least one SBFD symbol to inside the frequency bandwidth.

[0077] According to one or more embodiments of this aspect, the first parameter and the second parameter are received via one of radio resource control RRC signaling or system information signaling.

[0078] According to one or more embodiments of this aspect, multiple SSBs are mapped to multiple valid ROs that satisfy the validity condition, wherein the multiple valid ROs include all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes mapping the SSBs in a continuous manner in an order of increasing SSB index to valid ROs in an order of increasing frequency and then in an order of increasing time.

[0079] According to one or more embodiments of this aspect, multiple SSBs are mapped to multiple valid ROs that satisfy the validity condition, and the multiple valid ROs include all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, which is configured to map the SSBs to the valid ROs within the multiple UL-only symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index; and a second mapping, which is configured to map the SSBs to the valid ROs within the multiple SBFD symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index.

[0080] According to one or more embodiments of this aspect, receiving a preamble of at least one RO in the at least one SBFD symbol receives an indication of a target power.

[0081] According to one or more embodiments of this aspect, receiving an offset preamble of at least one RO in the at least one SBFD symbol receives an indication of a target power.

[0082] According to one or more embodiments of this aspect, Physical Random Access Channel PRACH signaling is transmitted in at least the RO.

[0083] According to another aspect of the present disclosure, a network node configured to communicate with a wireless device is provided. The network node is configured to transmit frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration; and receive physical random access channel PRACH signaling at a random access channel opportunity RO that meets a validity condition, the RO being located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL only symbol of the plurality of UL only symbols.

[0084] According to one or more embodiments of this aspect, the validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or within the at least one UL-only symbol.

[0085] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0086] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0087] According to one or more embodiments of this aspect, the network node is further configured to transmit a first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

[0088] According to one or more embodiments of this aspect, the network node is further configured to transmit a second parameter indicating a resource block RB start index of the RO in the frequency domain within the at least one SBFD symbol.

[0089] According to one or more embodiments of this aspect, the first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

[0090] According to one or more embodiments of this aspect, the first parameter and the second parameter are only applicable to the at least one SBFD symbol and not to the at least one UL-only symbol.

[0091] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0092] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

[0093] According to one or more embodiments of this aspect, the first parameter and the second parameter are parameters used to respectively indicate the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and wherein the network node is also configured to reposition at least one RO from outside the frequency bandwidth associated with the UL subband of the at least one SBFD symbol to inside the frequency bandwidth.

[0094] According to one or more embodiments of this aspect, the first parameter and the second parameter are received via one of radio resource control RRC signaling or system information SI signaling.

[0095] According to one or more embodiments of this aspect, the network node (16) is also configured to map multiple SSBs to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, the mapping comprising mapping the SSBs in a continuous manner in the order of increasing SSB index to valid ROs in the order of increasing frequency and then in the order of increasing time.

[0096] According to one or more embodiments of this aspect, the network node is also configured to map multiple SSBs to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, the first mapping being configured to map the SSBs to valid ROs within only the multiple UL-only symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index; and a second mapping, the second mapping being configured to map the SSBs to valid ROs within only the multiple SBFD symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index.

[0097] According to one or more embodiments of this aspect, the network node is further configured to indicate a preamble reception target power of at least one RO in the at least one SBFD symbol.

[0098] According to one or more embodiments of this aspect, the network node is further configured to indicate an offset preamble reception target power of at least one RO in the at least one SBFD symbol.

[0099] According to one or more embodiments of this aspect, the network node is further configured to determine the validity of the RO based on whether the RO satisfies the validity condition.

[0100] According to another aspect of the present disclosure, a method implemented by a network node configured to communicate with a wireless device is provided. Frequency domain configuration information and time domain configuration information are transmitted, wherein the frequency domain configuration information and the time domain configuration information indicate a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration. Physical random access channel PRACH signaling is received at a random access channel opportunity RO that meets a validity condition, wherein the RO is located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL only symbol of the plurality of UL only symbols.

[0101] According to one or more embodiments of this aspect, the validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or within the at least one UL-only symbol.

[0102] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0103] According to one or more embodiments of this aspect, the validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

[0104] According to one or more embodiments of this aspect, a first parameter is transmitted, the first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

[0105] According to one or more embodiments of this aspect, a second parameter is transmitted, the second parameter indicating a resource block RB start index of the RO in the frequency domain within the at least one SBFD symbol.

[0106] According to one or more embodiments of this aspect, the first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

[0107] According to one or more embodiments of this aspect, the first parameter and the second parameter are only applicable to the at least one SBFD symbol and not to the at least one UL-only symbol.

[0108] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

[0109] According to one or more embodiments of this aspect, the second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

[0110] According to one or more embodiments of this aspect, the first parameter and the second parameter are parameters used to respectively indicate the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and wherein at least one RO is relocated from outside the frequency bandwidth associated with the UL subband of the at least one SBFD symbol to inside the frequency bandwidth.

[0111] According to one or more embodiments of this aspect, the first parameter and the second parameter are transmitted via system information signaling.

[0112] According to one or more embodiments of this aspect, multiple SSBs are mapped to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes mapping the SSBs in a continuous manner in an order of increasing SSB index to valid ROs in an order of increasing frequency and then in an order of increasing time.

[0113] According to one or more embodiments of this aspect, multiple SSBs are mapped to multiple valid ROs that satisfy the validity condition, and the multiple valid ROs include all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, which is configured to map the SSBs to valid ROs within only the multiple UL-only symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index; and a second mapping, which is configured to map the SSBs to valid ROs within only the multiple SBFD symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in the order of increasing SSB index.

[0114] According to one or more embodiments of this aspect, a preamble indicating at least one RO in the at least one SBFD symbol receives a target power.

[0115] According to one or more embodiments of this aspect, an offset preamble indicating at least one RO in the at least one SBFD symbol receives a target power.

[0116] According to one or more embodiments of this aspect, the validity of the RO is determined based on whether the RO satisfies the validity condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0117] A more complete understanding of the present embodiments and the attendant advantages and features will be more readily appreciated by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which: Figure 1 is an example of a radio resource; Figure 2 It is a time slot; Figure 3 TDD and FDD are shown; Figure 4 It is the uplink / downlink structure of FDD and TDD; Figure 5 is an example TDD uplink / downlink (UL / DL) mode; Figure 6 is another example of UL / DL mode; Figure 7 A conventional TDD carrier is shown; Figure 8 A sub-band full-duplex system is shown; Fig. 9 is an example of a set of 3 resource blocks (RBs); Fig.10 is another example of a 3 RB set; Fig.11 is an example of a TDD antenna array; Fig.12 is an example antenna architecture; Fig.13 is an example PRACH configuration; Fig.14 is an example mapping; Fig.15 is a schematic diagram illustrating an example network architecture of a communication system connected to a host computer via an intermediate network according to the principles of the present disclosure; Fig.16 is a block diagram of a host computer communicating with a wireless device via a network node over an at least partially wireless connection according to some embodiments of the present disclosure; Fig.17is a flow chart illustrating an example method for executing a client application at a wireless device implemented in a communication system including a host computer, a network node, and a wireless device according to some embodiments of the present disclosure; Fig.18 is a flow chart illustrating an example method for receiving user data at a wireless device implemented in a communication system including a host computer, a network node, and a wireless device according to some embodiments of the present disclosure; Fig.19 is a flow chart illustrating an example method implemented in a communication system including a host computer, a network node, and a wireless device for receiving user data at a host computer from a wireless device according to some embodiments of the present disclosure; Fig. 20 is a flow chart illustrating an example method for receiving user data at a host computer implemented in a communication system including a host computer, a network node, and a wireless device according to some embodiments of the present disclosure; Fig.21 is a flow chart of an example process in a network node for a physical random access channel for sub-band full-duplex operation; Fig. 22 is a flow chart of an example process in a WD for a physical random access channel for sub-band full-duplex operation; Fig.23 is a flow chart of another example process in a network node for a physical random access channel for sub-band full-duplex operation; Fig.24 is a flow chart of another example process in a WD for a physical random access channel for sub-band full-duplex operation; Fig.25 shows the available RBs for UL transmission; Fig.26 Valid RACH opportunities in both sub-band frequency domain (SBFD) and UL symbols only are shown; Fig. 27 is an example of RO verification; Fig.28 is an example of a separate frequency-domain PRACH configuration in only UL symbols and SBFD symbols; Fig.29 is an example of a separate SSB to RO mapping; and Fig.30 is another example of SSB to RO mapping. DETAILED DESCRIPTION

[0118] Before describing the exemplary embodiments in detail, it should be noted that the embodiments reside primarily in a combination of apparatus components and processing steps associated with a physical random access channel for sub-band full-duplex operation. Therefore, in the accompanying drawings, conventional symbols are used to represent components where appropriate, and only those specific details relevant to understanding the embodiments are shown so as not to obscure the present disclosure with details that would be apparent to one of ordinary skill in the art having the benefit of the description herein. Like reference numerals refer to like elements throughout the specification.

[0119] As used herein, relational terms, such as "first" and "second", "top" and "bottom", etc., may be used solely to distinguish one entity or element from another entity or element, without necessarily requiring or implying any physical or logical relationship or order between such entities or elements. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the concepts described herein. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprise" or "comprising" and / or "include", "including", when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0120] In the embodiments described herein, the connection terms "in communication with..." and the like may be used to indicate electrical or data communication, which may be achieved, for example, by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling, or optical signaling. Those skilled in the art will appreciate that the multiple components may interoperate, and modifications and variations are possible to achieve electrical and data communication.

[0121] In some embodiments described herein, the terms "coupled," "connected," and the like may be used herein to indicate a connection, although not necessarily a direct connection, and may include wired and / or wireless connections.

[0122] The term "network node" used herein may be any kind of network node included in a radio network, and the network node may further include any one of the following: a base station (BS), a radio base station, a base transceiver station (BTS), a base station controller (BSC), a radio network controller (RNC), a gNode B (gNB), an evolved Node B (eNB or eNodeB), a Node B, an MSR radio node such as a multi-standard radio (MSR) BS, a multi-cell / multicast coordination entity (MCE), an integrated access and backhaul (IAB) node, a relay node, a donor node controlling a relay, a radio access point (AP), a transmission point, a transmission node, a remote radio unit (RRU), a remote radio head (RRH), a core network node (e.g., a mobile management entity (MME), a self-organizing network (SON) node, a coordination node, a positioning node, an MDT node, etc.), an external node (e.g., a third-party node, a node outside the current network), a node in a distributed antenna system (DAS), a spectrum access system (SAS) node, an element management system (EMS), etc. The network node may also include a test device. As used herein, the term "radio node" may also be used to refer to a wireless device (WD), such as a wireless device (WD) or a radio network node.

[0123] In some embodiments, non-limiting terms wireless device (WD) or user equipment (UE) are used interchangeably. The WD herein can be any type of wireless device capable of communicating with a network node or another WD via a radio signal, such as a wireless device (WD). The WD can also be a radio communication device, a target device, a device-to-device (D2D) WD, a machine type WD, or a WD capable of machine-to-machine communication (M2M), a low-cost and / or low-complexity WD, a sensor equipped with a WD, a tablet computer, a mobile terminal, a smart phone, a laptop embedded device (LEE), a laptop mounted device (LME), a USB dongle, a customer premises equipment (CPE), an Internet of Things (IoT) device, or a narrowband IoT (NB-IOT) device, etc.

[0124] Furthermore, in some embodiments, the general term "radio network node" is used. It may be any kind of radio network node, which may include any of the following: base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, multi-cell / multicast coordination entity (MCE), IAB node, relay node, access point, radio access point, remote radio unit (RRU), remote radio head (RRH).

[0125] Note that although terminology from a particular wireless system may be used in the present disclosure, such as, for example, 3GPP LTE and / or New Radio (NR), this should not be considered to limit the scope of the present disclosure to only the aforementioned systems. Other wireless systems, including but not limited to Wideband Code Division Multiple Access (WCDMA), Worldwide Interoperability for Microwave Access (WiMax), Ultra Mobile Broadband (UMB), and Global System for Mobile Communications (GSM), may also benefit from utilizing the ideas covered by the present disclosure.

[0126] It is also noted that the functions described herein as being performed by a wireless device or network node may be distributed across multiple wireless devices and / or network nodes. In other words, it is contemplated that the functions of the network nodes and wireless devices described herein are not limited to the performance of a single physical device and, in fact, may be distributed across several physical devices.

[0127] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will also be understood that the terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0128] Some embodiments provide a physical random access channel for sub-band full-duplex operation.

[0129] Referring now to the drawings, wherein like elements are represented by like reference numerals, Fig.15, a schematic diagram of a communication system 10 according to an embodiment is shown, for example, a 3GPP-type cellular network that can support standards such as LTE and / or NR (5G), which includes an access network 12 (e.g., a radio access network) and a core network 14. The access network 12 includes a plurality of network nodes 16a, 16b, 16c (collectively referred to as network nodes 16), such as NBs, eNBs, gNBs, and / or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (collectively referred to as coverage area 18). Each network node 16a, 16b, 16c can be connected to the core network 14 via a wired or wireless connection 20. A first wireless device (WD) 22a located in the coverage area 18a is configured to be wirelessly connected to or paged by the corresponding network node 16a. A second WD 22b in the coverage area 18b can be wirelessly connected to the corresponding network node 16b. Although multiple WDs 22a, 22b (collectively referred to as wireless devices 22) are shown in this example, the disclosed embodiments are equally applicable to situations where a single WD 22 is in the coverage area or a single WD 22 is connecting to a corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include more WDs 22 and network nodes 16.

[0130] In addition, it is contemplated that the WD 22 may communicate with more than one network node 16 and more than one type of network node 16 simultaneously and / or be configured to communicate with them individually. For example, the WD 22 may have dual connectivity with a network node 16 supporting LTE and the same or different network node 16 supporting NR. As an example, the WD 22 may communicate with an eNB for LTE / E-UTRAN and a gNB for NR / NG-RAN.

[0131] The communication system 10 itself can be connected to a host computer 24, which can be embodied in the hardware and / or software of a stand-alone server, a cloud-implemented server, a distributed server, or as a processing resource in a server cluster. The host computer 24 can be owned or controlled by a service provider, or can be operated by or on behalf of a service provider. The connections 26, 28 between the communication system 10 and the host computer 24 can extend directly from the core network 14 to the host computer 24, or can extend via an optional intermediate network 30. The intermediate network 30 can be one of the following or a combination of more than one of the following: a public network, a private network, or a hosted network. If present, the intermediate network 30 can be a backbone network or the Internet. In some embodiments, the intermediate network 30 can include two or more subnetworks (not shown).

[0132] Fig.15The communication system generally enables connectivity between one of WD 22a, 22b and host computer 24. This connectivity can be described as an over-the-top (OTT) connection. The host computer 24 and the connected WD 22a, 22b are configured to use the access network 12, the core network 14, any intermediate network 30 and possible additional infrastructure (not shown) as intermediaries to transmit data and / or signaling via the OTT connection. The OTT connection can be transparent in the sense that at least some of the participating communication devices through which the OTT connection passes do not know the routes of the uplink and downlink communications. For example, the network node 16 may not be or need not be informed of the past routes of incoming downlink communications to which data originating from the host computer 24 will be forwarded (e.g., handed over) to the connected WD 22a. Similarly, the network node 16 does not need to know the future routes of outgoing uplink communications originating from WD 22a initiated to the host computer 24.

[0133] The network node 16 is configured to include a RO unit 32 configured to determine the validity of a random access channel RACH opportunity RO based at least in part on whether the RO opportunity is contained within an uplink UL subband. The wireless device 22 is configured to include a RA unit 34 configured to perform random access in a first subband frequency domain SBFD symbol and an uplink (UL) symbol only.

[0134] According to the embodiment, reference will now be made to Fig.16 An example implementation of the WD 22, network node 16, and host computer 24 discussed in the previous paragraphs is described. In the communication system 10, the host computer 24 includes hardware (HW) 38, which includes a communication interface 40, which is configured to establish and maintain a wired or wireless connection with the interface of different communication devices of the communication system 10. The host computer 24 also includes a processing circuit 42, which may have storage and / or processing capabilities. The processing circuit 42 may include a processor 44 and a memory 46. In particular, in addition to a processor (e.g., a central processing unit) and a memory, or instead of a processor and a memory, the processing circuit 42 may include an integrated circuit for processing and / or control, such as one or more processors and / or processor cores and / or an FPGA (field programmable gate array) and / or an ASIC (application-specific integrated circuit), which is suitable for executing instructions. The processor 44 may be configured to access (e.g., write to and / or read from) a memory 46, which may include any kind of volatile and / or non-volatile memory, such as cache and / or buffer memory and / or RAM (random access memory) and / or ROM (read only memory) and / or optical memory and / or EPROM (erasable programmable read-only memory).

[0135] Processing circuitry 42 may be configured to control any of the methods and / or processes described herein, and / or cause such methods and / or processes to be performed, for example, by host computer 24. Processor 44 corresponds to one or more processors 44 for performing the functions of host computer 24 described herein. Host computer 24 includes memory 46 configured to store data, programming software code, and / or other information described herein. In some embodiments, software 48 and / or host application 50 may include instructions that, when executed by processor 44 and / or processing circuitry 42, cause processor 44 and / or processing circuitry 42 to perform the processes described herein for host computer 24. The instructions may be software associated with host computer 24.

[0136] The software 48 can be executed by the processing circuit 42. The software 48 includes a host application 50. The host application 50 is operable to provide services to remote users, such as WD 22 connected via an OTT connection 52 terminated at WD 22 and the host computer 24. When providing services to remote users, the host application 50 can provide user data transmitted using the OTT connection 52. "User data" can be data and information described herein as implementing the functionality. In one embodiment, the host computer 24 can be configured to provide control and functionality to a service provider, and can be operated by or on behalf of the service provider. The processing circuit 42 of the host computer 24 can enable the host computer 24 to observe, monitor, control, send and / or receive from the network node 16 and / or the wireless device 22.

[0137] The communication system 10 also includes a network node 16 provided in the communication system 10, and includes hardware 58 that enables it to communicate with the host computer 24 and the WD 22. The hardware 58 may include a communication interface 60 for establishing and maintaining a wired or wireless connection to the interface of different communication devices of the communication system 10, and a radio interface 62 for establishing and maintaining a wireless connection 64 with at least the WD 22 located in the coverage area 18 served by the network node 16. The radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers. The communication interface 60 may be configured to facilitate a connection 66 to the host computer 24. The connection 66 may be direct, or it may be through the core network 14 of the communication system 10 and / or through one or more intermediate networks 30 outside the communication system 10.

[0138] In the illustrated embodiment, the hardware 58 of the network node 16 also includes a processing circuit 68. The processing circuit 68 may include a processor 70 and a memory 72. Specifically, in addition to or in place of a processor (e.g., a central processing unit) and a memory, the processing circuit 68 may include an integrated circuit for processing and / or control, such as one or more processors and / or processor cores and / or an FPGA (field programmable gate array) and / or an ASIC (application-specific integrated circuit), which is suitable for executing instructions. The processor 70 may be configured to access (e.g., write to and / or read from) the memory 72, which may include any kind of volatile and / or non-volatile memory, such as a cache and / or buffer memory and / or a RAM (random access memory) and / or a ROM (read-only memory) and / or an optical memory and / or an EPROM (erasable programmable read-only memory).

[0139] Therefore, the network node 16 also has software 74 stored internally, for example, in the memory 72 or stored in an external memory (e.g., a database, a storage array, a network storage device, etc.) accessible by the network node 16 via an external connection. The software 74 can be executed by the processing circuit 68. The processing circuit 68 can be configured to control any method and / or process described herein, and / or cause such a method and / or process to be performed by, for example, the network node 16. The processor 70 corresponds to one or more processors 70 for performing the network node 16 functions described herein. The memory 72 is configured to store data, programming software code, and / or other information described herein. In some embodiments, the software 74 may include instructions that, when executed by the processor 70 and / or the processing circuit 68, cause the processor 70 and / or the processing circuit 68 to perform the process described herein with respect to the network node 16. For example, the processing circuit 68 of the network node 16 may include a RO unit 32 configured to determine the validity of a random access channel RACH opportunity RO based at least in part on whether the RO opportunity is contained within an uplink UL subband.

[0140] The communication system 10 also includes the already mentioned WD 22. The WD 22 may have hardware 80, which may include a radio interface 82 configured to establish and maintain a wireless connection 64 with a network node 16 serving the coverage area 18 in which the WD 22 is currently located. The radio interface 82 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers.

[0141] The hardware 80 of the WD 22 also includes a processing circuit 84. The processing circuit 84 may include a processor 86 and a memory 88. Specifically, in addition to or in place of a processor (e.g., a central processing unit) and a memory, the processing circuit 84 may include an integrated circuit for processing and / or control, such as one or more processors and / or processor cores and / or an FPGA (field programmable gate array) and / or an ASIC (application-specific integrated circuit), which is suitable for executing instructions. The processor 86 may be configured to access (e.g., write and / or read) a memory 88, which may include any kind of volatile and / or non-volatile memory, such as a cache and / or buffer memory and / or a RAM (random access memory) and / or a ROM (read-only memory) and / or an optical memory and / or an EPROM (erasable programmable read-only memory).

[0142] Therefore, WD 22 may also include software 90, which is stored in, for example, the memory 88 of WD 22, or in an external memory (e.g., a database, a storage array, a network storage device, etc.) accessible by WD 22. Software 90 may be executed by processing circuit 84. Software 90 may include client application 92. With the support of host computer 24, client application 92 may operate to provide services to human or non-human users via WD 22. In host computer 24, the executing host application 50 may communicate with the executing client application 92 via the OTT connection 52 terminated at WD 22 and host computer 24. When providing services to users, client application 92 may receive request data from host application 50 and provide user data in response to the request data. OTT connection 52 may transmit both request data and user data. Client application 92 may interact with the user to generate the user data it provides.

[0143] The processing circuit 84 may be configured to control any method and / or process described herein, and / or to cause such a method and / or process to be performed by, for example, WD 22. The processor 86 corresponds to one or more processors 86 for performing the WD 22 functions described herein. The WD 22 includes a memory 88 configured to store data, programming software code, and / or other information described herein. In some embodiments, the software 90 and / or the client application 92 may include instructions that, when executed by the processor 86 and / or the processing circuit 84, cause the processor 86 and / or the processing circuit 84 to perform the process described herein with respect to the WD 22. In particular, the processing circuit 84 may include a RA unit 34 configured to perform random access in the first sub-band frequency domain SBFD symbol and only uplink (UL) symbols.

[0144] In some embodiments, the internal workings of network node 16, WD 22, and host computer 24 may be as follows: Fig.16 shown, and independently, the surrounding network topology can be Fig.15 topology.

[0145] exist Fig.16 , the OTT connection 52 has been abstractly drawn to illustrate communications between the host computer 24 and the wireless device 22 via the network node 16, without explicit reference to any intermediate devices and the precise routing of messages via these devices. The network infrastructure can determine the routing, which can be configured to be hidden from the WD 22 or the service provider operating the host computer 24, or both. When the OTT connection 52 is active, the network infrastructure can further make decisions by which the network infrastructure dynamically changes the routing (e.g., based on load balancing considerations or reconfiguration of the network).

[0146] The wireless connection 64 between WD 22 and network node 16 is consistent with the teachings of the embodiments described throughout this disclosure. One or more of the various embodiments improves the performance of OTT services provided to WD 22 using OTT connection 52, where wireless connection 64 can form the last leg. More specifically, the teachings of some of these embodiments can improve data rates, latency, and / or power consumption, and thereby provide benefits such as reduced user waiting time, relaxed restrictions on file size, better responsiveness, extended battery life, etc.

[0147] In some embodiments, a measurement process may be provided to monitor data rates, delays, and other factors that are improved by one or more embodiments. There may also be optional network functionality for reconfiguring the OTT connection 52 between the host computer 24 and the WD 22 in response to changes in the measurement results. The measurement process and / or network functionality for reconfiguring the OTT connection 52 may be implemented in the software 48 of the host computer 24 or the software 90 of the WD 22, or both. In an embodiment, a sensor (not shown) may be deployed in or associated with a communication device through which the OTT connection 52 passes; the sensor may participate in the measurement process by providing the values ​​of the monitored quantities exemplified above, or providing the values ​​of other physical quantities that the software 48, 90 can calculate or estimate for the monitored quantities. The reconfiguration of the OTT connection 52 may include message formats, retransmission settings, preferred routes, etc.; the reconfiguration does not need to affect the network node 16, and it may be unknown or imperceptible to the network node 16. Some such processes and functionality may be known and practiced in the art. In some embodiments, the measurement may include proprietary WD signaling to facilitate the host computer 24 to measure throughput, propagation time, delay, etc. In some embodiments, the measurement may be achieved because the software 48, 90 causes messages (particularly empty or "dummy" messages) to be transmitted using the OTT connection 52 while it monitors propagation times, errors, etc.

[0148] Thus, in some embodiments, the host computer 24 includes processing circuitry 42 configured to provide user data and a communication interface 40 configured to forward the user data to a cellular network for transmission to the WD 22. In some embodiments, the cellular network also includes a network node 16 having a radio interface 62. In some embodiments, the network node 16 is configured and / or the network node 16 processing circuitry 68 is configured to perform the functions and / or methods described herein for preparing / initiating / maintaining / supporting / terminating transmissions to the WD 22, and / or preparing / terminating / maintaining / supporting / terminating receipt of transmissions from the WD 22.

[0149] In some embodiments, host computer 24 includes processing circuitry 42 and communication interface 40 configured to receive user data originating from a transmission from WD 22 to network node 16. In some embodiments, WD 22 is configured to and / or includes a radio interface 82 and / or processing circuitry 84 configured to perform the functions and / or methods described herein for preparing / initiating / maintaining / supporting / terminating a transmission to network node 16, and / or preparing / terminating / maintaining / supporting / terminating receipt of a transmission from network node 16.

[0150] although Fig.15 and Fig.16Various "units" such as RO unit 32 and RA unit 34 are shown as being within respective processors, but it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuit. In other words, the unit may be implemented within the processing circuit in hardware or a combination of hardware and software.

[0151] Fig.17 is a flow chart illustrating an example method implemented in a communication system, such as, for example, Fig.15 and Fig.16 The communication system may include a host computer 24, a network node 16 and a WD 22, which may be a reference Fig.16 Those described in the present disclosure. In a first step of the method, the host computer 24 provides user data (box S100). In an optional sub-step of the first step, the host computer 24 provides user data by executing a host application, such as, for example, the host application 50 (box S102). In a second step, the host computer 24 initiates a transmission carrying the user data to the WD 22 (box S104). In an optional third step, in accordance with the teachings of the embodiments described throughout the present disclosure, the network node 16 transmits the user data to the WD 22, which is carried in the transmission initiated by the host computer 24 (box S106). In an optional fourth step, the WD 22 executes a client application associated with the host application 50 executed by the host computer 24, such as, for example, the client application 92 (box S108).

[0152] Fig.18 is a flow chart illustrating an example method implemented in a communication system, such as, for example, Fig.15 The communication system may include a host computer 24, a network node 16, and a WD 22, which may be a reference Fig.15 and Fig.16 Those described. In a first step of the method, host computer 24 provides user data (box S110). In an optional sub-step (not shown), host computer 24 provides user data by executing a host application, such as, for example, host application 50. In a second step, host computer 24 initiates a transmission carrying user data to WD 22 (box S112). According to the teachings of the embodiments described throughout this disclosure, the transmission can be transmitted via network node 16. In an optional third step, WD 22 receives the user data carried in the transmission (box S114).

[0153] Fig.19 is a flow chart illustrating an example method implemented in a communication system, such as, for example, Fig.15The communication system may include a host computer 24, a network node 16, and a WD 22, which may be a reference Fig.15 and Fig.16 Those described. In the optional first step of the method, WD 22 receives input data provided by host computer 24 (box S116). In the optional sub-step of the first step, WD 22 executes client application 92, which provides user data in response to the received input data provided by host computer 24 (box S118). Additionally or alternatively, in the optional second step, WD 22 provides user data (box S120). In the optional sub-step of the second step, WD provides user data by executing a client application, such as, for example, client application 92 (box S122). When providing user data, the executed client application 92 can further consider the user input received from the user. Regardless of the specific manner of providing user data, WD 22 can initiate the transmission of user data to host computer 24 in an optional third sub-step (box S124). In the fourth step of the method, according to the teachings of the embodiments described throughout the present disclosure, host computer 24 receives user data transmitted from WD 22 (box S126).

[0154] Fig. 20 is a flow chart illustrating an example method implemented in a communication system, such as, for example, Fig.15 The communication system may include a host computer 24, a network node 16, and a WD 22, which may be a reference Fig.15 and Fig.16 In an optional first step of the method, in accordance with the teachings of the embodiments described throughout the present disclosure, the network node 16 receives user data from the WD 22 (block S128). In an optional second step, the network node 16 initiates a transmission of the received user data to the host computer 24 (block S130). In a third step, the host computer 24 receives the user data carried in the transmission initiated by the network node 16 (block S132).

[0155] Fig.21Flowchart of an example process in a network node 16 for a physical random access channel for sub-band full-duplex operation. One or more blocks described herein may be performed by one or more elements of the network node 16, such as by one or more of the processing circuit 68 (including the RO unit 32), the processor 70, the radio interface 62, and / or the communication interface 60. For example, via the processing circuit 68 and / or the processor 70 and / or the radio interface 62 and / or the communication interface 60, the network node 16 is configured to determine the validity of a random access channel RACH opportunity RO based at least in part on whether the RO opportunity is contained within the uplink UL sub-band (block S134). The process also includes mapping a synchronization signal block SSB index to the RO determined to be valid (block S136).

[0156] In some embodiments, mapping includes mapping on all ROs in a frequency first / time second manner regardless of symbol type. In some embodiments, mapping includes mapping to sub-band frequency domain SBFD symbols and UL only symbols. In some embodiments, the method includes configuring WD 22 to perform random access in the first sub-band frequency domain SBFD symbols and UL only symbols. In some embodiments, determining the validity of the RO includes determining whether the RO is within one of the sub-band frequency domain SBFD symbols and UL only symbols.

[0157] Fig. 22 is a flow chart of an example process in a wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of the wireless device 22, such as by one or more of the processing circuit 84 (including the RA unit 34), the processor 86 and / or the radio interface 82. The wireless device 22 is configured to receive a configuration of a random access channel RACH opportunity RO from a network node, such as via the processing circuit 84 and / or the processor 86 and / or the radio interface 83 (block S138). The process also includes performing random access in a first sub-band frequency domain SBFD symbol and an uplink (UL) symbol only (block S140). In some embodiments, the method also includes determining a resource block RB offset based at least in part on the size of the sub-band associated with the SBFD symbol and the UL symbol only.

[0158] Fig.23 is a flow chart of another example process in the network node 16 for a physical random access channel for sub-band full-duplex operation. One or more blocks described herein may be performed by one or more elements of the network node 16, such as by one or more of the processing circuits 68 (including the RO unit 32), the processor 70, the radio interface 62, and / or the communication interface 60.

[0159] As described herein, the network node 16 is configured to transmit (block S142) frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink-only UL symbols in a time division duplex TDD configuration. As described herein, the network node 16 is configured to receive (block S144) physical random access channel PRACH signaling in a random access channel opportunity RO that satisfies a validity condition, wherein the RO is located in at least one SBFD symbol of the plurality of SBFD symbols, or is located in at least one UL-only symbol of the plurality of UL-only symbols. In one or more embodiments, the validity condition is a time domain and / or frequency domain condition that can be used to determine whether one or more ROs are valid.

[0160] According to one or more embodiments, the validity condition defines that the RO is valid based on the RO being located within at least one SBFD symbol or within at least one UL-only symbol.

[0161] According to one or more embodiments, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of at least one SBFD symbol.

[0162] According to one or more embodiments, the validity condition indicates that the RO is valid based on all configured ROs in the at least one SBFD symbol being contained within the bandwidth of the UL subband of the at least one SBFD symbol.

[0163] According to one or more embodiments, the network node 16 is further configured to transmit a first parameter indicating the number of ROs in the frequency domain within at least one SBFD symbol.

[0164] According to one or more embodiments, the network node 16 is further configured to transmit a second parameter indicating a resource block RB start index of the RO in the frequency domain within the at least one SBFD symbol.

[0165] According to one or more embodiments, the first parameter applies to both at least one SBFD symbol and at least one UL-only symbol, and the second parameter applies only to at least one SBFD symbol.

[0166] According to one or more embodiments, the first parameter and the second parameter are applicable only to at least one SBFD symbol and not to at least one UL-only symbol.

[0167] According to one or more embodiments, the second parameter is an RB offset relative to an RB start index of the RO in the frequency domain within at least one UL-only symbol.

[0168] According to one or more embodiments, the second parameter is an RB offset relative to a starting RB of the UL subband within the at least one SBFD symbol.

[0169] According to one or more embodiments, the first parameter and the second parameter are parameters for indicating the number of ROs in the frequency domain of at least one UL-only symbol and the RB start index of the ROs in the frequency domain, respectively, and wherein the network node 16 is further configured to relocate at least one RO from outside of a frequency bandwidth associated with a UL subband of at least one SBFD symbol to inside of the frequency bandwidth.

[0170] According to one or more embodiments, the first parameter and the second parameter are received via one of radio resource control RRC signaling or system information SI signaling.

[0171] According to one or more embodiments, the network node 16 is further configured to map the plurality of SSBs to a plurality of valid ROs satisfying a validity condition, wherein the plurality of valid ROs include all valid ROs within a plurality of UL-only symbols of the TDD configuration and all valid ROs within a plurality of SBFD symbols of the TDD configuration, and the mapping includes mapping the SSBs in a sequential manner in an order of increasing SSB index to the valid ROs in an order of increasing frequency and then in an order of increasing time.

[0172] According to one or more embodiments, the network node 16 is also configured to map multiple SSBs to multiple valid ROs that satisfy a validity condition, wherein the multiple valid ROs include all valid ROs within multiple UL-only symbols of the TDD configuration and all valid ROs within multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, which is configured to map the SSBs in a continuous manner in the order of increasing SSB index to valid ROs within only multiple UL-only symbols in the TDD configuration in the order of increasing frequency and then in the order of increasing time; and a second mapping, which is configured to map the SSBs in a continuous manner in the order of increasing SSB index to valid ROs within only multiple SBFD symbols in the TDD configuration in the order of increasing frequency and then in the order of increasing time.

[0173] According to one or more embodiments, the network node 16 is further configured to indicate a preamble reception target power of at least one RO in at least one SBFD symbol.

[0174] According to one or more embodiments, the network node 16 is further configured to indicate an offset preamble reception target power for at least one RO in at least one SBFD symbol.

[0175] According to one or more embodiments, the network node 16 is further configured to determine the validity of the RO based on whether the RO satisfies a validity condition.

[0176] Fig.24is a flow chart of an example process in the wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of the wireless device 22, such as one or more of the processing circuit 84 (including the RA unit 34), the processor 86, and / or the radio interface 82.

[0177] As described herein, the wireless device 22 is configured to receive (block S146) frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration. As described herein, the wireless device 22 is configured to determine (block S148) the validity of a random access channel RACH opportunity RO based on whether a validity condition is satisfied, wherein the RO is located in at least one SBFD symbol of the plurality of SBFD symbols, or is located in at least one UL only symbol of the plurality of UL only symbols.

[0178] According to one or more embodiments, the validity condition defines that the RO is valid based on the RO being located within at least one SBFD symbol or being located within at least one UL-only symbol.

[0179] According to one or more embodiments, the validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of at least one SBFD symbol.

[0180] According to one or more embodiments, the validity condition indicates that the RO is valid based on all configured ROs in the at least one SBFD symbol being contained within the bandwidth of the UL subband of the at least one SBFD symbol.

[0181] According to one or more embodiments, the wireless device 22 is further configured to receive a first parameter indicating a number of ROs in the frequency domain within at least one SBFD symbol.

[0182] According to one or more embodiments, the wireless device 22 is further configured to receive a second parameter indicating a resource block RB start index of the RO in the frequency domain within at least one SBFD symbol.

[0183] According to one or more embodiments, the first parameter applies to both at least one SBFD symbol and at least one UL-only symbol, and the second parameter applies only to at least one SBFD symbol.

[0184] According to one or more embodiments, the first parameter and the second parameter are applicable only to at least one SBFD symbol and not to at least one UL-only symbol.

[0185] According to one or more embodiments, the second parameter is an RB offset relative to an RB start index of the RO in the frequency domain within at least one UL-only symbol.

[0186] According to one or more embodiments, the wireless device 22 is further configured to determine an RB offset relative to an RB start index of the RO in the frequency domain within at least one UL-only symbol.

[0187] According to one or more embodiments, the second parameter is an RB offset relative to a starting RB of the UL subband within the at least one SBFD symbol.

[0188] According to one or more embodiments, the wireless device 22 is further configured to determine a starting RB during at least one SBFD symbol based on at least one of: a starting RB of a starting RO in at least one UL-only symbol; and a starting RB of a UL subband in at least one SBFD symbol.

[0189] According to one or more embodiments, the first parameter and the second parameter are parameters for respectively indicating the number of ROs in the frequency domain of at least one UL-only symbol and the RB start index of the RO in the frequency domain; and the wireless device 22 is also configured to reposition at least one RO from outside the frequency bandwidth associated with the UL subband of at least one SBFD symbol to inside the frequency bandwidth.

[0190] According to one or more embodiments, the first parameter and the second parameter are received via one of radio resource control RRC signaling or system information SI signaling.

[0191] According to one or more embodiments, the wireless device 22 is further configured to map a plurality of SSBs to a plurality of valid ROs satisfying a validity condition, wherein the plurality of valid ROs include all valid ROs within a plurality of UL-only symbols of the TDD configuration and all valid ROs within a plurality of SBFD symbols of the TDD configuration, and the mapping includes mapping the SSBs in a sequential manner in an order of increasing SSB index to the valid ROs in an order of increasing frequency and then in an order of increasing time.

[0192] According to one or more embodiments, the wireless device 22 is also configured to map multiple SSBs to multiple valid ROs that satisfy a validity condition, wherein the multiple valid ROs include all valid ROs within multiple UL-only symbols of the TDD configuration and all valid ROs within multiple SBFD symbols of the TDD configuration, wherein the mapping includes: a first mapping, which is configured to map the SSBs to only valid ROs within the multiple UL-only symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in an order of increasing SSB index; and a second mapping, which is configured to map the SSBs to only valid ROs within the multiple SBFD symbols in the TDD configuration in an order of increasing frequency and then in an order of increasing time in a continuous manner in an order of increasing SSB index.

[0193] According to one or more embodiments, the wireless device 22 is further configured to receive an indication of a preamble reception target power for at least one RO in at least one SBFD symbol.

[0194] According to one or more embodiments, the wireless device 22 is further configured to receive an indication of an offset preamble reception target power for at least one RO in at least one SBFD symbol.

[0195] According to one or more embodiments, the wireless device 22 is further configured to transmit Physical Random Access Channel PRACH signaling in at least the RO.

[0196] Having described the general process flow of the arrangements of the present disclosure and provided examples of hardware and software arrangements for implementing the processes and functions of the present disclosure, the following section provides details and examples of arrangements of physical random access channels for sub-band full-duplex operation.

[0197] In the following embodiments, a SBFD symbol is a symbol configured so that it can be used for SBFD operation, i.e., simultaneous gNB transmission / reception within the same carrier. In one example, a SBFD symbol contains two 'D' frequency subbands (RB sets) and one 'U' subband (RB set) in the middle of the carrier - a so-called DUD configuration. In contrast, a UL-only symbol is a symbol that can only be used for WD transmission within a carrier.

[0198] Some embodiments include methods to enable WD to perform RACH in the 'U' subband of these symbols instead of only in UL-only symbols. In some embodiments, the number of RBs available for RACH in SBFD symbols is different compared to UL-only symbols. This Fig.25 Shown in.

[0199] A non-limiting example system configuration is as follows: UL BWP size UL sub-band size ●The first UL subband RB index within a BWP is and / or ●The last UL subband RB index within the BWP is A Group Example (Based on Overlapping FDRA) Example A-1

[0200] This embodiment uses Fig.13, except that all symbols of the 'D' slot in TDD UL / DL mode are now configured for SBFD operation using the DUD subband configuration. In this embodiment, RO is valid in both SBFD and UL-only symbols. Fig.26 As shown in FIG. 1 , wherein the Fig.13 Compared with only time slots 9 and 19 in , the ROs in time slots 5, 7, 9, 15, 17 and 19 are valid.

[0201] Some embodiments may include one or more of the following: The PRACH configuration index is selected from an existing table in the current 3GPP specification (e.g. Fig.13 and Fig.26 Index 118 shown); msg1-FDM and msg1-FrequencyStart are configured such that all FDM'd ROs are fully contained in the active BWP within the UL-only symbols, despite the fact that some ROs in SBFD symbols may not be fully contained in the 'U' subband of these symbols; and / or ● RO verification includes new time domain and frequency domain conditions. This is a supplement to the time domain conditions that exist in the current 3GPP technical specifications and versions. In some embodiments, this joint time domain and frequency domain condition can be generated as follows: ○ The PRACH opportunity in the PRACH slot is valid in the following cases: ■ The PRACH opportunity is within a UL symbol (as described in 3GPP TS 38.213); and / or ■ The PRACH opportunity is within the SBFD symbol and the RBs of the PRACH opportunity are completely contained within the 'U' subband; ○ Otherwise, the PRACH opportunity is invalid.

[0202] Fig. 27 is an example where 4 FDM'd ROs are configured. In the UL-only symbols (slots 9 and 19), all 4 ROs must be valid; otherwise, this is a misconfiguration. In this example, it is assumed that the 'U' subband in the SBFD symbols in slots 5, 7, 15, 17 is wide enough to completely contain the middle two ROs in the frequency domain. Using the above validation rules, the edge ROs in the SBFD symbols of these slots are invalid, leaving only the two middle ROs. Example A-2

[0203] This embodiment inherits the process of Embodiment A-1, except that in order for any RO to be valid, the configured ROs must all be completely contained within the bandwidth of the UL subband, regardless of whether the RO is in UL-only symbols or in SBFD symbols. Group B Example (FDRA interpretation based on time slot correlation)

[0204] In some embodiments, a slot-dependent configuration of RO occasions is disclosed, wherein one slot type consists of only UL symbols and another slot type consists of SBFD symbols. The following aspects are common to all Group B embodiments: The PRACH configuration index is selected according to the current NR specifications and protocols (e.g., index 118 as described above); ● Based on the existing RRC parameters msg1-FDM and msg1-FrequencyStart, configure the FDM'd RO in UL symbols only according to the current NR specifications and protocols; ● The verification of RO includes at least one new time domain condition. This is in addition to the time domain conditions existing in the current 3GPP specification. This joint condition is generated as follows: ○ The PRACH opportunity in the PRACH slot is valid in the following cases: ■ The PRACH opportunity is within a UL symbol (as described in 3GPP TS 38.213); and / or ■ the PRACH opportunity is within a SBFD symbol; and / or ○ Otherwise, the PRACH opportunity is invalid. Embodiment B-1 (Explicit Parameters of RB Start Index)

[0205] The embodiment includes the following aspects applicable to RO in SBFD symbols: ● define a new RRC parameter to indicate the RB start index of the first RO in the frequency domain in the SBFD symbol, for example msg1-FrequencyStart2, where the RB index is contained within the 'U' subband; and / or ●The WD determines the number of ROs in the frequency domain in the SBFD symbol according to the existing RRC parameter msg1-FDM.

[0206] In one or more embodiments, the new RRC parameters may refer to non-legacy parameters or RRC parameters that are separate from the parameters defined for at least one UL symbol.

[0207] In a variation of this embodiment, if the UL subband size is small enough so that one or more configured ROs in the frequency domain fall outside the UL subband, these ROs are invalidated using the same RO validation process as in Embodiment A-1, which includes both new time domain and frequency domain conditions. Embodiment B-2 (Explicit parameters for RB start index and number of FDM'd ROs)

[0208] This embodiment includes the following aspects of RO in SBFD symbols: ● Define a first new RRC parameter to indicate the RB start index of the first RO in the frequency domain in the SBFD symbol, for example such as msg1-FrequencyStart2, where the RB index is contained within the 'U' subband in the SBFD symbol; and / or ● defining a second new RRC parameter to indicate the number of FDM'd ROs in the frequency domain in the SBFD symbol, such as msg1-FDM2;

[0209] Fig.28 An example of configuring 4 FDM'd ROs in UL-only symbols (slots 9 and 19) using parameters msg1-FDM and msg1-FrequencyStart is shown. In SBFD symbols (slots 5, 7, 15, 17), separate parameters msg1-FDM2 and msg1-FrequencyStart2 are used to configure a single FDM'd RO in the 'U' subband only. All PRACH slots in the time domain contain valid ROs because all symbols in TDD UL / DL mode are SBFD or UL-only symbols.

[0210] This embodiment inherits the process of embodiment B-1 or B-2, except that the RB start index of the first RO in the SBFD symbol is changed to the RB offset based on the existing RB start index msg1-FrequencyStart configured with respect to the RRC. To determine:

[0211] In some embodiments, the offset It is semi-statically configured to the WD from the network via RRC configuration or via system information transmission.

[0212] In some embodiments, WD is based on the size of the bandwidth portion. UL subband size Instead of explicitly signaling the offset(s) to the WD, the offset may be implicitly determined by the DL subband size(s), the existing starting RB index msg1-FrequencyStart, or any combination of these values. Embodiment B-4 (RB offset relative to the first RB of the UL subband)

[0213] This embodiment inherits the process of embodiment B-1 or B-2, except that the RB start index of the first RO in the SBFD symbol is changed to be based on the RB offset relative to the first RB of the UL subband. To determine:

[0214] In some embodiments, the offset is semi-statically configured to the WD from the network via RRC configuration or via system information transmission. In another non-limiting example, the offset Not explicitly signaled, but stated in the specification. Embodiment B-5 (with respect to the start RB of the first RB of the UL subband)

[0215] This embodiment inherits the process of embodiment B-1 or B-2, except that the RB start index of the first RO in the SBFD symbol is changed to be determined relative to the first RB of the UL subband based on the existing RRC parameter msg1-FrequencyStart: Embodiment B-6 (start RB with respect to the first RB of the UL subband + module wrapping)

[0216] The embodiment includes one or more of the following aspects applicable to RO in SBFD symbols: The RB start index of the first RO in the SBFD symbol is determined relative to the first RB of the UL subband based on the existing RRC parameter msg1-FrequencyStart: ● WD determines the number of ROs in the frequency domain in the SBFD symbol according to the existing RRC parameter msg1-FDM; and / or If the UL subband size is small enough that one or more configured ROs in the frequency domain fall outside the UL subband, the RB start index of one or more of those ROs is swapped back into the UL subband using a modulo operation. For the nth RO, the start RB index is thus adjusted as follows: Among them, RB n It is the starting RB index of the nth RO before adjustment. Group C Example (SSB to RO Mapping)

[0217] Any of the embodiments of Group A or Group B can be used to determine the effective RO in both the time domain and the frequency domain. After determining the effective RO, the SSB index must be mapped to the effective RO. Fig.25 Conventional methods of such mapping for static TDD systems are discussed. Various embodiments are disclosed herein for mapping SSB indices to ROs in the case of SBFD systems. Example C-1 (Continuous SSB to RO Mapping on All ROs)

[0218] Fig.29An example set of valid ROs determined using any one of Group A or B embodiments is shown, where 2 frequency-domain ROs are valid in each slot in which a SBFD symbol is configured, and where 4 frequency-domain ROs are valid in each UL-only slot.

[0219] In this embodiment, the SSB index is mapped in a frequency first time second manner over all valid ROs in a continuous manner, regardless of the fact that the SBFD symbols and the UL-only symbols have different numbers of ROs in the frequency domain. Fig. 27 The SSB index mapped to each RO is shown for the following example, where ssb-perRACH-OccasionAndCB-PreamblesPerSSB is configured as 'one', ie, there is only one SSB index mapped to each RO.

[0220] Fig.30 An example set of valid ROs determined using any one of Group A or B embodiments is shown, where 2 frequency-domain ROs are valid in each slot in which a SBFD symbol is configured, and 4 frequency-domain ROs are valid in each UL-only slot.

[0221] In some embodiments, SSBs are mapped in a frequency first, time second manner within a given symbol type in a sequential manner, i.e., separate mapping of SBFD symbols to UL-only symbols. This is in contrast to embodiment 3 where the symbol type does not affect the mapping order. Fig.30 A separate mapping is shown in , where the numbers shown in columns (for SBFD symbols) have only two rows, and where the numbers shown in columns (for UL-only symbols) have four rows.

[0222] The advantage of separate mapping is that it is ensured that for a given ssb-perRACH-OccasionAndCB-PreamblesPerSSB setting, all SSB indices will be mapped to UL-only symbols. This is in contrast to the example in Embodiment 3 where only SSB indices 5, 6, 7, and 8 were mapped to UL-only symbols. The advantage of mapping all SSB indices to UL-only symbols is that these symbols are generally more robust than SBFD symbols that the gNB may transmit while trying to receive a WD's PRACH transmission, as they are not subject to self-interference. Group D Example (Preamble Received Power)

[0223] In the following embodiments, different ways of configuring the preamble reception target power are disclosed. The common point of the embodiments is that the preamble reception target power is configured differently for preamble transmission in SBFD symbols and UL-only symbols.

[0224] An advantage of configuring the preamble reception target power separately is that SBFD symbols that may suffer from self-interference can be configured with a higher preamble transmission reception power than UL-only time slots, thereby compensating for the higher interference. Example D-1 (Explicit parameters for SBFD symbols)

[0225] The embodiment may include the following aspects for RO in SBFD symbols: ● define a new RRC parameter (e.g., preambleReceivedTargetPower2) to indicate the preamble received target power of the RO in the SBFD symbol; and / or ● When the preamble is transmitted in RO in SBFD symbols, WD uses preambleReceivedTargetPower2 to calculate Calculate its transmission power. Example D-2 (Offset relative to UL-only symbols)

[0226] The embodiment may include the following aspects for RO in SBFD symbols: ● define a new RRC parameter (e.g. preambleReceivedTargetPowerOffset) to indicate the offset preamble received target power of the RO in the SBFD symbol; and / or ● When the RO in the SBFD symbol transmits a preamble, the WD uses preambleReceivedTargetPower+preambleReceivedTargetPowerOffset to calculate its transmit power instead of using only preambleReceivedTargetPower.

[0227] Some embodiments may include one or more of the following.

[0228] Embodiment A1. A network node configured to communicate with a wireless device (WD), the network node configured to perform the following steps and / or comprising a radio interface and / or comprising a processing circuit, the radio interface and / or the processing circuit configured to perform the following steps: determining validity of a random access channel (RACH) opportunity (RO) based at least in part on whether the RO opportunity is contained within an uplink (UL) subband; and The synchronization signal block SSB index is mapped to the RO determined to be valid.

[0229] Embodiment A2. The network node of Embodiment A1, wherein the mapping comprises mapping in a frequency first / time second manner across all ROs regardless of symbol type.

[0230] Embodiment A3. The network node of Embodiment A1, wherein the mapping comprises mapping to sub-band frequency domain SBFD symbols and UL-only symbols.

[0231] Embodiment A4. The network node of any one of Embodiments A1 and A2, wherein the network node, the radio interface and / or the processing circuit is configured to configure the WD to perform random access in first sub-band frequency domain SBFD symbols and UL symbols only.

[0232] Embodiment A5. The network node of Embodiment A4, wherein determining the validity of the RO comprises determining whether the RO is within one of a sub-band frequency domain SBFD symbol and a UL-only symbol.

[0233] Embodiment B1. A method implemented in a network node, the method comprising: determining validity of a random access channel (RACH) opportunity (RO) based at least in part on whether the RO opportunity is contained within an uplink (UL) subband; The synchronization signal block SSB index is mapped to the RO determined to be valid.

[0234] Embodiment B2. The method of Embodiment B1, wherein the mapping comprises mapping on all ROs in a frequency first / time second manner regardless of symbol type.

[0235] Embodiment B3. The method as described in embodiment B1, wherein the mapping includes mapping to sub-band frequency domain SBFD symbols and UL symbols only.

[0236] Embodiment B4. The method as described in any one of embodiments B1 and B2, wherein the method further comprises: configuring the WD to perform random access in the first sub-band frequency domain SBFD symbols and UL symbols only.

[0237] Embodiment B5. The method of embodiment B4, wherein determining the validity of the RO comprises determining whether the RO is within one of a sub-band frequency domain SBFD symbol and a UL-only symbol.

[0238] Embodiment C1. A wireless device WD configured to communicate with a network node, the WD configured to perform the following steps and / or comprising a radio interface and / or comprising a processing circuit, the radio interface and / or the processing circuit configured to perform the following steps: receiving a configuration of a random access channel RACH opportunity RO from the network node; and Random access is performed in the first sub-band frequency-domain SBFD symbol and only uplink (UL) symbols.

[0239] Embodiment C2. The WD of embodiment C1, wherein the WD, radio interface, and / or processing circuitry is configured to determine a resource block (RB) offset based at least in part on a size of a subband associated with the SBFD symbol and the UL-only symbol.

[0240] Embodiment D1. A method in a wireless device WD, the WD being configured to communicate with a network node, the method comprising: receiving a configuration of a random access channel RACH opportunity RO from the network node; and Random access is performed in the first sub-band frequency-domain SBFD symbol and only uplink (UL) symbols.

[0241] Embodiment D2. The method of embodiment D1, further comprising determining a resource block (RB) offset based at least in part on a size of a subband associated with the SBFD symbol and the UL-only symbol.

[0242] As will be appreciated by those skilled in the art, the concepts described herein may be embodied as methods, data processing systems, computer program products, and / or computer storage media storing executable computer programs. Therefore, the concepts described herein may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects, all of which are collectively referred to herein as "circuits" or "modules". Any process, step, action, and / or functionality described herein may be performed and / or associated with a corresponding module, which may be implemented with software and / or firmware and / or hardware. In addition, the present disclosure may take the form of a computer program product on a tangible computer-usable storage medium, which has a computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer-readable medium may be utilized, including a hard disk, a CD-ROM, an electronic storage device, an optical storage device, or a magnetic storage device.

[0243] Some embodiments are described herein with reference to the flowchart and / or block diagram of the method, system and computer program product. It will be understood that each frame of the flowchart and / or block diagram and the combination of frames in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer (thereby creating a special-purpose computer), a special-purpose computer or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a part for implementing the function / action specified in one or more frames of the flowchart and / or block diagram.

[0244] These computer program instructions may also be stored in a computer-readable memory or storage medium, which can instruct a computer or other programmable data processing device to function in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction component that implements the functions / actions specified in one or more boxes of the flowchart and / or block diagram.

[0245] Computer program instructions may also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions / actions specified in one or more boxes of the flowchart and / or block diagram.

[0246] It should be understood that the functions / actions noted in the blocks may not occur in the order noted in the operational description. For example, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order, depending on the functionality / actions involved. Although some figures include arrows on communication paths to illustrate the primary direction of communication, it will be understood that communication may occur in the direction opposite to the arrows shown.

[0247] Computer program code for carrying out operations of the concepts described herein can be written in an object oriented programming language such as Python, Or C++. However, the computer program code for performing the operations of the present disclosure may also be written in a conventional procedural programming language, such as the "C" programming language. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer. In the latter case, the remote computer may be connected to the user's computer via a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0248] In conjunction with the above description and the accompanying drawings, many different embodiments have been disclosed herein. It will be understood that it would be overly repetitive and confusing to literally describe and illustrate every combination and subcombination of these embodiments. Therefore, all embodiments can be combined in any manner and / or combination, and this specification, including the accompanying drawings, should be interpreted as constituting a complete written description of all combinations and subcombinations of the embodiments described herein and the manner and process of making and using them, and should support claims to any such combination or subcombination.

[0249] Those skilled in the art will appreciate that the embodiments described herein are not limited to what has been specifically shown and described herein above. In addition, unless otherwise mentioned above, it should be noted that all drawings are not drawn to scale. Based on the above teachings, various modifications and variations are possible without departing from the scope of the following claims.

Claims

1. A wireless device (22) configured to communicate with a network node (16), the wireless device (22) being configured to: receive frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex (SBFD) symbols and a plurality of uplink-only (UL) symbols in a time division duplex (TDD) configuration; and The validity of a random access channel RACH opportunity RO is determined based on whether a validity condition is satisfied, the RO being located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols.

2. The wireless device (22) of claim 1, wherein: The validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or being located within the at least one UL-only symbol.

3. The wireless device (22) of claim 1, wherein: The validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

4. The wireless device (22) of claim 1, wherein: The validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

5. The wireless device (22) according to any one of claims 1 to 4, wherein: The wireless device (22) is further configured to receive a first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

6. The wireless device (22) of claim 5, wherein: The wireless device (22) is further configured to receive a second parameter indicating a resource block (RB) start index of the RO in the frequency domain within the at least one SBFD symbol.

7. The wireless device (22) of claim 6, wherein: The first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

8. The wireless device (22) of claim 6, wherein: The first parameter and the second parameter are applicable only to the at least one SBFD symbol but not to the at least one UL-only symbol.

9. The wireless device (22) of claim 6, wherein: The second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

10. The wireless device (22) of claim 6, wherein: The wireless device (22) is further configured to determine an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

11. The wireless device (22) of claim 6, wherein: The second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

12. The wireless device (22) of claim 6, wherein: The wireless device (22) is further configured to determine a starting RB of the at least one SBFD symbol period based on at least one of the following: A starting RB of a starting RO in the at least one UL-only symbol; and The starting RB of the UL subband in the at least one SBFD symbol.

13. The wireless device (22) of claim 6, wherein: The first parameter and the second parameter are parameters for respectively indicating the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and The wireless device (22) is also configured to relocate at least one RO from outside of a frequency bandwidth associated with a UL subband of the at least one SBFD symbol to inside of the frequency bandwidth.

14. The wireless device (22) according to any one of claims 1 to 13, wherein: The first parameter and the second parameter are received via one of radio resource control (RRC) signaling or system information (SI) signaling.

15. The wireless device (22) according to any one of claims 1 to 14, wherein: The wireless device (22) is also configured to map multiple SSBs to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, the mapping comprising mapping the SSBs in a continuous manner in an order of increasing SSB index to the valid ROs in an order of increasing frequency and then in an order of increasing time.

16. The wireless device (22) according to any one of claims 1 to 14, wherein: The wireless device (22) is further configured to map a plurality of SSBs to a plurality of valid ROs satisfying the validity condition, the plurality of valid ROs comprising all valid ROs within the plurality of UL-only symbols of the TDD configuration and all valid ROs within the plurality of SBFD symbols of the TDD configuration, the mapping comprising: a first mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of UL-only symbols in the TDD configuration in increasing order of frequency and then in increasing order of time; and A second mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of SBFD symbols in the TDD configuration in increasing order of frequency and then in increasing order of time.

17. The wireless device (22) according to any one of claims 1 to 16, wherein: The wireless device is further configured to receive an indication of a preamble reception target power for at least one RO in the at least one SBFD symbol.

18. The wireless device (22) according to any one of claims 1 to 17, wherein: The wireless device is further configured to receive an indication of an offset preamble reception target power for at least one RO in the at least one SBFD symbol.

19. The wireless device (22) according to any one of claims 1 to 17, wherein: The wireless device is further configured to transmit Physical Random Access Channel (PRACH) signaling in at least the RO.

20. A method implemented by a wireless device (22), the wireless device (22) being configured to communicate with a network node (16), the method comprising: receiving (S146) frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink-only UL symbols in a time division duplex TDD configuration; as well as The validity of a random access channel RACH opportunity RO located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols is determined (S148) based on whether a validity condition is satisfied.

21. The method according to claim 20, wherein: The validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or being located within the at least one UL-only symbol.

22. The method according to claim 20, wherein: The validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

23. The method according to claim 20, wherein: The validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

24. The method according to any one of claims 20-23, further comprising receiving a first parameter indicating a number of ROs in the frequency domain within the at least one SBFD symbol.

25. The method of claim 24, further comprising receiving a second parameter indicating a resource block (RB) start index of the RO in the frequency domain within the at least one SBFD symbol.

26. The method according to claim 25, wherein: The first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

27. The method according to claim 25, wherein: The first parameter and the second parameter are applicable only to the at least one SBFD symbol but not to the at least one UL-only symbol.

28. The method according to claim 25, wherein: The second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

29. The method of claim 25, further comprising determining an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

30. The method of claim 25, wherein: The second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

31. The method of claim 25, further comprising determining a starting RB of the at least one SBFD symbol period based on at least one of: A starting RB of a starting RO in the at least one UL-only symbol; and The starting RB of the UL subband in the at least one SBFD symbol.

32. The method of claim 25, wherein: The first parameter and the second parameter are parameters for respectively indicating the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and The wireless device is further configured to relocate at least one RO from outside of a frequency bandwidth associated with a UL subband of the at least one SBFD symbol to inside of the frequency bandwidth.

33. The method according to any one of claims 20 to 32, wherein: The first parameter and the second parameter are received via one of radio resource control (RRC) signaling or system information signaling.

34. The method according to any one of claims 20-33 also includes mapping multiple SSBs to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, and the mapping includes mapping the SSBs to valid ROs in an order of increasing frequency and then in an order of increasing time in a continuous manner in an order of increasing SSB index.

35. The method according to any one of claims 20-33, further comprising mapping a plurality of SSBs to a plurality of valid ROs satisfying the validity condition, the plurality of valid ROs comprising all valid ROs within the plurality of UL-only symbols of the TDD configuration and all valid ROs within the plurality of SBFD symbols of the TDD configuration, the mapping comprising: a first mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within the plurality of UL-only symbols in the TDD configuration in increasing order of frequency and then in increasing order of time; as well as A second mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within the plurality of SBFD symbols in the TDD configuration in increasing order of frequency and then in increasing order of time.

36. The method of any one of claims 20-35, further comprising receiving an indication of a preamble reception target power for at least one RO in the at least one SBFD symbol.

37. The method of any one of claims 20-36, further comprising receiving an indication of an offset preamble reception target power for at least one RO in the at least one SBFD symbol.

38. The method according to any one of claims 20-36, further comprising transmitting Physical Random Access Channel (PRACH) signaling in at least the RO.

39. A network node (16) configured to communicate with a wireless device (22), the network node (16) being configured to: transmitting frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink only UL symbols in a time division duplex TDD configuration; and Physical random access channel PRACH signaling is received at a random access channel opportunity RO that satisfies a validity condition, the RO being located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols.

40. The network node (16) of claim 39, wherein: The validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or being located within the at least one UL-only symbol.

41. The network node (16) of claim 39, wherein: The validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

42. The network node (16) of claim 39, wherein: The validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

43. The network node (16) according to any one of claims 39 to 42, wherein: The network node (16) is further configured to transmit a first parameter indicating the number of ROs in the frequency domain within the at least one SBFD symbol.

44. The network node (16) according to claim 43, wherein: The network node (16) is further configured to transmit a second parameter indicating a resource block (RB) start index of the RO in the frequency domain within the at least one SBFD symbol.

45. The network node (16) of claim 44, the first parameter being applicable to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter being applicable only to the at least one SBFD symbol.

46. ​​The network node (16) of claim 44, wherein: The first parameter and the second parameter are applicable only to the at least one SBFD symbol but not to the at least one UL-only symbol.

47. The network node (16) of claim 44, wherein: The second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

48. The network node (16) of claim 44, wherein: The second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

49. The network node (16) of claim 44, wherein: The first parameter and the second parameter are parameters for respectively indicating the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and The network node (16) is further configured to relocate at least one RO from outside of a frequency bandwidth associated with a UL subband of the at least one SBFD symbol to inside of the frequency bandwidth.

50. The network node (16) according to any one of claims 39-49, wherein: The first parameter and the second parameter are transmitted via one of radio resource control (RRC) signaling or system information (SI) signaling.

51. The network node (16) according to any one of claims 39-50, wherein: The network node (16) is also configured to map a plurality of SSBs to a plurality of valid ROs satisfying the validity condition, the plurality of valid ROs including all valid ROs within the plurality of UL-only symbols of the TDD configuration and all valid ROs within the plurality of SBFD symbols of the TDD configuration, the mapping comprising mapping the SSBs in a sequential manner in order of increasing SSB index to the valid ROs in order of increasing frequency and then in order of increasing time.

52. The network node (16) according to any one of claims 39-50, wherein: The network node (16) is further configured to map a plurality of SSBs to a plurality of valid ROs satisfying the validity condition, the plurality of valid ROs comprising all valid ROs within the plurality of UL-only symbols of the TDD configuration and all valid ROs within the plurality of SBFD symbols of the TDD configuration, the mapping comprising: a first mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of UL-only symbols in the TDD configuration in increasing order of frequency and then in increasing order of time; and A second mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of SBFD symbols in the TDD configuration in increasing order of frequency and then in increasing order of time.

53. The network node (16) according to any one of claims 39 to 52, wherein: The network node (16) is further configured to indicate a preamble reception target power of at least one RO in the at least one SBFD symbol.

54. The network node (16) according to any one of claims 39 to 52, wherein: The network node (16) is further configured to indicate an offset preamble reception target power of at least one RO in the at least one SBFD symbol.

55. The network node (16) according to any one of claims 39 to 54, wherein: The network node is further configured to determine the validity of the RO based on whether the RO satisfies the validity condition.

56. A method implemented by a network node (16), the network node (16) being configured to communicate with a wireless device (22), the method comprising: transmitting (S142) frequency domain configuration information and time domain configuration information, the frequency domain configuration information and the time domain configuration information indicating a plurality of sub-band full-duplex SBFD symbols and a plurality of uplink-only UL symbols in a time division duplex TDD configuration; and A physical random access channel PRACH signaling is received (S144) at a random access channel opportunity RO satisfying a validity condition, the RO being located in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols.

57. The method of claim 56, wherein: The validity condition defines that the RO is valid based on the RO being located within the at least one SBFD symbol or being located within the at least one UL-only symbol.

58. The method of claim 56, wherein: The validity condition indicates that the RO is valid based on the RO being contained within a bandwidth of a UL subband of the at least one SBFD symbol.

59. The method of claim 56, wherein: The validity condition indicates that the RO is valid based on that all configured ROs in the at least one SBFD symbol are contained within a bandwidth of a UL subband of the at least one SBFD symbol.

60. The method according to any one of claims 56-59, further comprising transmitting a first parameter indicating a number of ROs in the frequency domain within the at least one SBFD symbol.

61. The method of claim 60, further comprising transmitting a second parameter indicating a resource block (RB) start index of the RO in the frequency domain within the at least one SBFD symbol.

62. The method of claim 61, wherein: The first parameter applies to both the at least one SBFD symbol and the at least one UL-only symbol, and the second parameter applies only to the at least one SBFD symbol.

63. The method of claim 61, wherein: The first parameter and the second parameter are applicable only to the at least one SBFD symbol but not to the at least one UL-only symbol.

64. The method of claim 61, wherein: The second parameter is an RB offset relative to the RB start index of the RO in the frequency domain within the at least one UL-only symbol.

65. The method of claim 61, wherein: The second parameter is an RB offset relative to a start RB of a UL subband within the at least one SBFD symbol.

66. The method of claim 61, wherein: The first parameter and the second parameter are parameters for respectively indicating the number of ROs in the frequency domain of the at least one UL-only symbol and the RB start index of the RO in the frequency domain; and The method also includes relocating at least one RO from outside of a frequency bandwidth associated with a UL subband of the at least one SBFD symbol to inside of the frequency bandwidth.

67. The method according to any one of claims 56 to 66, wherein: The first parameter and the second parameter are transmitted via one of radio resource control (RRC) signaling or system information signaling.

68. The method according to any one of claims 56-67 further includes mapping multiple SSBs to multiple valid ROs that satisfy the validity condition, the multiple valid ROs including all valid ROs within the multiple UL-only symbols of the TDD configuration and all valid ROs within the multiple SBFD symbols of the TDD configuration, the mapping comprising mapping the SSBs in a continuous manner in the order of increasing SSB index to the valid ROs in the order of increasing frequency and then in the order of increasing time.

69. The method of any one of claims 56-67, further comprising mapping a plurality of SSBs to a plurality of valid ROs satisfying the validity condition, the plurality of valid ROs comprising all valid ROs within the plurality of UL-only symbols of the TDD configuration and all valid ROs within the plurality of SBFD symbols of the TDD configuration, the mapping comprising: a first mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of UL-only symbols in the TDD configuration in increasing order of frequency and then in increasing order of time; as well as A second mapping configured to map the SSBs in increasing order of SSB index in a sequential manner to valid ROs within only the plurality of SBFD symbols in the TDD configuration in increasing order of frequency and then in increasing order of time.

70. The method according to any one of claims 56-69, further comprising indicating a preamble reception target power of at least one RO in the at least one SBFD symbol.

71. The method according to any one of claims 56-69, further comprising indicating an offset preamble code reception target power of at least one RO in the at least one SBFD symbol.

72. The method of any one of claims 56-71, further comprising determining the validity of the RO based on whether the RO satisfies the validity condition.

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