Method and device related to random access

Abstract

The disclosure relates to a 5G or 6G communication system supporting a higher data transmission rate. The invention concerns a method and device for random access. In an aspect, a method performed by user equipment (UE) in a communication system is provided, comprising: receiving third random access configuration information including fifth configuration information for a first repetition number of a first random access and sixth configuration information for a second repetition number of a second random access, wherein the second random access is related to a second feature, determining at least one random access occasion RO set candidate for repetition transmission based on the third configuration information, wherein the RO set includes first-RO(s) and / or second-RO(s),corresponding to the first random access and the second random access, respectively; performing repetition transmission of random access using one RO set selected from the at least one RO set.

Description

METHOD AND DEVICE RELATED TO RANDOM ACCESS

[0001] The present application relates to wireless communication, and more particularly, to a method and device related to random access.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "Beyond 4G networks" or "Post-LTE systems".

[0009] In order to achieve a higher data rate, 5G communication systems are implemented in higher frequency (millimeter, mmWave) bands, e.g., 60 GHz bands. In order to reduce propagation loss of radio waves and increase a transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming and large-scale antenna are discussed in 5G communication systems.

[0010] In addition, in 5G communication systems, developments of system network improvement are underway based on advanced small cell, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation, etc.

[0011] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0012] How to perform random access in combination with the newly emerging uplink resources through subband non-overlapping full duplex is a problem to be solved. In addition, the present disclosure may also solve other problems related to performing random access transmission by using newly emerging uplink resources, such as but not limited to: for supporting two-step random access transmission in SBFD system, the problem of configuration of PUSCH of message A and the problem of mapping between msgA PRACH and msgA PUSCH; and the problem of supporting multiple random access transmissions (for example, random access transmission repetition) in SBFD system, in which the problem of determining the resources required for random access repetition transmissions and so on

[0013] According to an embodiment of the present disclosure, there is provided a method performed by user equipment (UE) in a communication system, comprising:

[0014] receiving first random access configuration information related to first random access and second random access configuration information related to second random access for a second feature,

[0015] wherein, the first random access configuration information includes first configuration information related to first random access resource for a message A of two-step random access and second configuration information related to first PUSCH resource for the message A,

[0016] wherein, the second random access configuration information includes third configuration information for second random access resource for a message A of the second feature and / or fourth configuration information for second PUSCH resource for the message A of the second feature,

[0017] wherein, the first PUSCH resource includes first-PO (PUSCH occasion) and resource for first DMRS associated with the first-PO, and the second PUSCH resource includes second-PO and resource for second DMRS associated with the second-PO;

[0018] determining valid random access resource including valid first random access resource and valid second random access resource, and valid PUSCH resource including valid first PUSCH resource and / or valid second PUSCH resource, from the first random access resource, the second random access resource, the first PUSCH resource and the second PUSCH resource;

[0019] performing mapping between the valid second random access resource and the valid PUSCH resource;

[0020] if the second random access resource is selected from the valid random access resources, performing transmission of message A based on the selected second random access resource and / or PUSCH resource mapped to the selected second random access resource.

[0021] In an implementation, the third configuration information includes at least one of:

[0022] a configuration index for the second random access;

[0023] a number of frequency domain ROs for the second random access;

[0024] frequency domain start location of ROs for the second random access;

[0025] preamble root sequence index for the second random access;

[0026] a number of preambles for the second random access;

[0027] power related configuration for the second random access.

[0028] In an implementation, the fourth configuration information includes at least one of:

[0029] start location of the second-PO;

[0030] a number of second-POs in time domain;

[0031] a number of second-POs in frequency domain;

[0032] a time domain interval between the second-POs,

[0033] a frequency domain gap between the second-POs;

[0034] a number of time domain units corresponding to a second-PO;

[0035] a number of frequency domain units corresponding to a second-PO;

[0036] a number of second DMRS resources for the second feature corresponding to a second-PO;

[0037] configuration information of mapping between the first random access resource and / or the second random access resource and the first PUSCH resource and / or the second PUSCH resource.

[0038] In an implementation, the valid PUSCH resource includes a PO that satisfies at least one of:

[0039] all symbols of the PO are second symbols for the second feature;

[0040] all symbols of the PO are second symbols or flexible symbols;

[0041] an interval between the first symbol of the PO and the last second symbol in a slot corresponding to the PO is not less than a first time unit threshold;

[0042] at least one of frequency domain units corresponding to the PO is within uplink subbands for the second feature;

[0043] the PO is mapped to random access resource;

[0044] the PO does not overlap with a valid RO.

[0045] In an implementation, the performing mapping between the valid second random access resource and the valid PUSCH resource, comprises:

[0046] for each association pattern period, according to a first mapping order, sequentially mapping each group of first number of continuous preamble indexes for the valid second-RO in a random access slot to the valid PUSCH resource.

[0047] In an implementation, the first number is obtained based on a ratio between a number of preambles corresponding to the valid first random access resource in the association pattern period and a number of DMRS resources corresponding to the valid first PUSCH resource in the association pattern period,

[0048] wherein, the valid first random access resource includes a valid second-RO and / or a valid first-RO,

[0049] wherein, the valid first PUSCH resource includes the valid second-PO and / or the valid first-PO.

[0050] In an implementation, the valid PUSCH resource includes: a valid second-PO and resource for an associated second DMRS and / or a valid first-PO and resource for an associated first DMRS,

[0051] wherein, the first mapping order includes:

[0052] for preamble indexes, first, in increasing order of preamble indexes within a single second-RO, second, in increasing order of frequency resource indexes for frequency multiplexed second-ROs, and third, in increasing order of time resource indexes for time division multiplexed second-ROs within the random access slot, and

[0053] for valid PUSCH resources, first, in increasing order of frequency domain resource indexes for frequency division multiplexed second-POs and / or a valid first-PO, second, in increasing order of second DMRS resource indexes within a second-PO or in increasing order of first DMRS resource indexes within a valid first-PO, third in increasing order of time resource indexes for time division multiplexed second-POs and / or first-POs within the PUSCH slot, and fourth in increasing order of indexes for PUSCH slots in the association pattern period.

[0054] In an implementation, the second DMRS resource indexes in the second-PO is determined in the following order: first in an ascending order of a second DMRS port index and second in an ascending order of a second DMRS sequence index,

[0055] wherein, the first DMRS resource index in the valid first-PO is determined in the following order: first in an ascending order of the first DMRS port index, and second in an ascending order of the first DMRS sequence index.

[0056] In an implementation, the message A is transmitted based on a first power,

[0057] wherein, if the selected random access resource is a second random access resource and the PUSCH resource mapped to the random access resource is a second PUSCH resource, the first power is determined based on an initial received power of the second preamble for the second feature and a first power offset between the second preamble and the second PUSCH; or

[0058] if the selected random access resource is the second random access resource and the mapped PUSCH resource is the first PUSCH resource, the first power is determined based on the initial received power of the second preamble and a second power offset between the second preamble and the first PUSCH.

[0059] In an implementation, the initial received power of the second preamble reuses an initial received power of a first preamble, the first power offset reuses a first power offset between the first preamble and the first PUSCH, the first preamble is used for the first random access,

[0060] the second power offset reuses the first power offset, or the second power offset is obtained based on the first power offset and a power difference between the second PUSCH and the first PUSCH, and the power difference is a predefined value, a configured value, or obtained based on a subcarrier spacing of random access channel of Message A or PUSCH.

[0061] In an implementation, the method further comprises: detecting response from a network device to the message A by using a first RNTI,

[0062] wherein, the first RNTI is determined based on a RO corresponding to the selected random access resource, or

[0063] the first RNTI is determined based on a dedicated RNTI configured by the network device for the second random access.

[0064] In an implementation, at least one of a control resource set, a search space and a search window for detecting the response is dedicated to UE supporting or aware of the second feature or dedicated to the second random access.

[0065] According to an embodiment of the present disclosure, there is provided a method performed by user equipment (UE) in a communication system, comprising:

[0066] receiving third random access configuration information including fifth configuration information for a first repetition number of repetition transmissions of a first random access and sixth configuration information for a second repetition number of repetition transmissions of a second random access, the second random access being related to a second feature,

[0067] based on the third random access configuration information, determining at least one random access occasion RO set candidate for repetition transmission of random access, wherein the RO set includes first-RO(s) and / or second-RO(s), wherein the first-RO corresponds to the first random access and the second-RO corresponds to the second random access;

[0068] performing repetition transmission of random access using one RO set selected from the at least one RO set.

[0069] In an implementation, a RO set of the at least one RO set includes valid first-RO(s) determined based on the first repetition number, or

[0070] a RO set of the at least one RO set includes valid second-RO(s) determined based on the second repetition number, or

[0071] the at least one RO set includes a set of valid first-ROs determined based on the first repetition number and a set of valid second-ROs determined based on the second repetition number within a first time period related to the determined set of valid first-ROs, or

[0072] a RO set of the at least one RO set includes first-RO(s) and second-RO(s) determined based on the first repetition number or the second repetition number.

[0073] In an implementation, in the case that a preamble format for the first random access is the same as that for the second random access, and / or the first repetition number is the same as the second repetition number, a RO set of the at least one RO set includes first-RO(s) and second-RO(s) determined based on the first repetition number or the second repetition number.

[0074] In an implementation, if an interval between a first-RO and a second-RO in the selected RO set is not greater than a second threshold and / or preamble formats or subcarrier spacings corresponding to the first-RO and the second-RO in the selected RO set are different, the method further comprises:

[0075] UE only transmits the first-RO; or

[0076] UE only transmits the second-RO.

[0077] According to an embodiment of the present disclosure, there is provided a method performed by user equipment (UE) in a communication system, comprising:

[0078] receiving seventh configuration information related to at least one of an initial preamble target received power and a power ramping step for a first random access and a second random access, wherein the second random access is related to a second feature;

[0079] based on the seventh configuration information, according to whether a performed random access is the first random access or the second random access, determining a cumulative power ramping value correspondingly;

[0080] determining a transmission power for a preamble based on the seventh configuration information and the accumulated power ramping value;

[0081] performing random access based on the determined transmission power,

[0082] wherein, a performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,

[0083] a performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.

[0084] In an implementation, the seventh configuration information includes at least one of:

[0085] an initial preamble target received power for the first random access;

[0086] an initial preamble target received power for the second random access;

[0087] an initial preamble target received power for the first random access and the second random access;

[0088] a first power ramping step for the first random access;

[0089] a second power ramping step for the second random access;

[0090] a third power ramp step for the first random access and the second random access.

[0091] In an implementation,

[0092] if the performed random access is the first random access, the accumulated power ramping value is increased by the first power ramping step or the third power ramping step,

[0093] if the performed random access is the second random access, the accumulated power ramping value is increased by the second power ramping step or the third power ramping step.

[0094] In an implementation, the cumulative power ramp value is determined based on a power ramping step corresponding to the performed random access and a counter related to power ramping.

[0095] In an implementation, the counter related to power ramping includes a first counter that counts power ramp for the first random access and a second counter that counts power ramp for the second random access,

[0096] wherein, if the UE performs random access using resource for the first random access and / or a first condition related to power ramping is satisfied, the first counter is increased by a first set value, or

[0097] wherein, if the UE performs random access using resource for the second random access and / or the first condition related to power ramping is satisfied, the second counter is increased by a second set value.

[0098] In an implementation, the counter related to power ramping includes a third counter that counts power ramp for the first random access and the second random access together,

[0099] wherein, if the UE performs random access using any one of resource for the first random access and resource for the second random access and / or the first condition related to power ramping is satisfied, the third counter is increased by a third set value.

[0100] In an implementation, the method further comprises:

[0101] determining a value of a counter related to a number of random access transmissions, wherein the counter related to a number of random access transmissions includes a fourth counter counting a number of transmissions of the first random access and a fifth counter counting a number of transmissions of the second random access, or the counter related to a number of random access transmissions is a sixth counter counting a number of transmissions of the first random access and the number of transmissions of the second random access together,

[0102] if the fourth counter and / or the fifth counter reach corresponding maximum values, reporting a random access error, or

[0103] if one of the fourth counter and the fifth counter reaches a maximum value, performing random access using only resource for random access corresponding to the other of the fourth counter and the fifth counter,

[0104] wherein, the maximum value includes a fourth maximum value corresponding to the fourth counter and a fifth maximum value corresponding to the fifth counter.

[0105] In an implementation,

[0106] if the UE performs random access using the resource for the first random access, the fourth counter is increased by a fourth set value,

[0107] if the UE performs random access using the resource for the second random access, the fifth counter is increased by a fifth set value,

[0108] if the UE performs random access using any one of the resource for the first random access and the resource for the second random access, the sixth counter is increased by a sixth set value.

[0109] In an implementation, the fourth maximum is a multiple of the fifth maximum.

[0110] In an implementation, the method further comprises:

[0111] if the sixth counter reaches a sixth maximum value, reporting a random access error,

[0112] wherein the sixth maximum value is a multiple of the maximum value of the fourth counter or obtained by increasing the maximum value of the fourth counter by a second value.

[0113] According to an embodiment of the present disclosure, there is provided a method performed by user equipment (UE) in a communication system, comprising:

[0114] determining whether there is a symbol configured for a second feature from a set of symbols including symbols of a valid first-RO and a second number of symbols before the first-RO;

[0115] if it is determined that there is a symbol configured for the second feature in the set of symbols, expecting to receive downlink signals on part or all of symbols in the set of symbols.

[0116] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0117] transmitting first random access configuration information related to first random access and second random access configuration information related to second random access for a second feature to user equipment UE,

[0118] wherein, the first random access configuration information includes first configuration information related to first random access resource for a message A of two-step random access and second configuration information related to first PUSCH resource for the message A,

[0119] wherein, the second random access configuration information includes third configuration information for second random access resource for a message A of the second feature and / or fourth configuration information for second PUSCH resource for the message A of the second feature,

[0120] wherein, the first PUSCH resource includes first PUSCH occasion PO and resource for first DMRS associated with the first-PO, and the second PUSCH resource includes second-PO and resource for second DMRS associated with the second-PO;

[0121] receiving a message A from the UE, wherein transmission of the message A is performed based on selected second random access resource and / or a PUSCH resource mapped to the selected second random access resource based on the UE selecting a second random access resource from among valid random access resources,

[0122] wherein, the valid random access resource and the valid PUSCH resource are determined from the first random access resource, the second random access resource, the first PUSCH resource and the second PUSCH resource, wherein the valid random access resource includes valid first random access resource and valid second random access resource, and the valid PUSCH resource includes valid first PUSCH resource and / or valid second PUSCH resource.

[0123] In an implementation, the third configuration information includes at least one of:

[0124] a configuration index for the second random access;

[0125] a number of frequency domain ROs for the second random access;

[0126] frequency domain start location of ROs for the second random access;

[0127] preamble root sequence index for the second random access;

[0128] a number of preambles for the second random access;

[0129] power related configuration for the second random access.

[0130] In an implementation, the fourth configuration information includes at least one of:

[0131] start location of the second-PO;

[0132] a number of second-POs in time domain;

[0133] a number of second-POs in frequency domain;

[0134] a time domain interval between the second-POs,

[0135] a frequency domain gap between the second-POs;

[0136] a number of time domain units corresponding to a second-PO;

[0137] a number of frequency domain units corresponding to a second-PO;

[0138] a number of second DMRS resources for the second feature corresponding to a second-PO;

[0139] configuration information of mapping between the first random access resource and / or the second random access resource and the first PUSCH resource and / or the second PUSCH resource.

[0140] In an implementation, the valid PUSCH resource includes a PO that satisfies at least one of:

[0141] all symbols of the PO are second symbols for the second feature;

[0142] all symbols of the PO are second symbols or flexible symbols;

[0143] an interval between the first symbol of the PO and the last second symbol in a slot corresponding to the PO is not less than a first time unit threshold;

[0144] at least one of frequency domain units corresponding to the PO is within uplink subbands for the second feature;

[0145] the PO is mapped to random access resource;

[0146] the PO does not overlap with a valid RO.

[0147] In an implementation, the message A is transmitted based on a first power,

[0148] wherein, if the selected random access resource is a second random access resource and the PUSCH resource mapped to the random access resource is a second PUSCH resource, the first power is determined based on an initial received power of the second preamble for the second feature and a first power offset between the second preamble and the second PUSCH; or

[0149] if the selected random access resource is the second random access resource and the mapped PUSCH resource is the first PUSCH resource, the first power is determined based on the initial received power of the second preamble and a second power offset between the second preamble and the first PUSCH.

[0150] In an implementation, the initial received power of the second preamble reuses an initial received power of a first preamble, the first power offset reuses a first power offset between the first preamble and the first PUSCH, the first preamble is used for the first random access,

[0151] the second power offset reuses the first power offset, or the second power offset is obtained based on the first power offset and a power difference between the second PUSCH and the first PUSCH, and the power difference is a predefined value, a configured value, or obtained based on a subcarrier spacing of random access channel of Message A or PUSCH.

[0152] In an implementation, the method further comprises transmitting response for the message A related to a first RNTI to the UE,

[0153] wherein, the first RNTI is related to a RO corresponding to the selected random access resource, or

[0154] the first RNTI is a dedicated RNTI configured by the network device for the second random access.

[0155] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0156] transmitting third random access configuration information to UE, wherein the third random access configuration information includes fifth configuration information for a first repetition number of repetition transmissions of a first random access and sixth configuration information for a second repetition number of repetition transmissions of a second random access, the second random access being related to a second feature,

[0157] receiving repetition transmission of random access performed by using one RO set selected from at least one RO set from UE,

[0158] wherein the at least one RO set is determined based on the third random access configuration information, and the RO set includes first-RO(s) and / or second-RO(s), wherein the first-RO corresponds to the first random access and the second-RO corresponds to the second random access.

[0159] In an implementation, a RO set of the at least one RO set includes valid first-RO(s) determined based on the first repetition number, or

[0160] a RO set of the at least one RO set includes valid second-RO(s) determined based on the second repetition number, or

[0161] the at least one RO set includes a set of valid first-ROs determined based on the first repetition number and a set of valid second-ROs determined based on the second repetition number within a first time period related to the determined set of valid first-ROs, or

[0162] a RO set of the at least one RO set includes first-RO(s) and second-RO(s) determined based on the first repetition number or the second repetition number.

[0163] In an implementation, in the case that a preamble format for the first random access is the same as that for the second random access, and / or the first repetition number is the same as the second repetition number, a RO set of the at least one RO set includes first-RO(s) and second-RO(s) determined based on the first repetition number or the second repetition number.

[0164] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0165] transmitting seventh configuration information related to at least one of an initial preamble target received power and a power ramping step for a first random access and a second random access, wherein the second random access is related to a second feature;

[0166] receiving random access performed based on a determined transmission power from the UE,

[0167] wherein the transmission power of preamble of the random access is determined based on the seventh configuration information and an accumulated power ramping value,

[0168] the accumulated power ramping value is determined correspondingly according to whether a performed random access is the first random access or the second random access based on the seventh configuration information,

[0169] wherein, a performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,

[0170] a performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.

[0171] In an implementation, the seventh configuration information includes at least one of:

[0172] an initial preamble target received power for the first random access;

[0173] an initial preamble target received power for the second random access;

[0174] an initial preamble target received power for the first random access and the second random access;

[0175] a first power ramping step for the first random access;

[0176] a second power ramping step for the second random access;

[0177] a third power ramp step for the first random access and the second random access.

[0178] In an implementation,

[0179] if the performed random access is the first random access, the accumulated power ramping value is increased by the first power ramping step or the third power ramping step,

[0180] if the performed random access is the second random access, the accumulated power ramping value is increased by the second power ramping step or the third power ramping step.

[0181] In an implementation, the cumulative power ramp value is determined based on a power ramping step corresponding to the performed random access and a counter related to power ramping.

[0182] In an implementation, the counter related to power ramping includes a first counter that counts power ramp for the first random access and a second counter that counts power ramp for the second random access,

[0183] wherein, if the UE performs random access using resource for the first random access and / or a first condition related to power ramping is satisfied, the first counter is increased by a first set value, or

[0184] wherein, if the UE performs random access using resource for the second random access and / or the first condition related to power ramping is satisfied, the second counter is increased by a second set value.

[0185] In an implementation, the counter related to power ramping includes a third counter that counts power ramp for the first random access and the second random access together,

[0186] wherein, if the UE performs random access using any one of resource for the first random access and resource for the second random access and / or the first condition related to power ramping is satisfied, the third counter is increased by a third set value.

[0187] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0188] determining whether there is a symbol configured for a second feature from a set of symbols including symbols of a valid first-RO and a second number of symbols before the first-RO;

[0189] if it is determined that there is a symbol configured for the second feature in the set of symbols, transmit downlink signals on part or all pf symbols in the set of symbols.

[0190] According to an embodiment of the present disclosure, there is provided a user equipment (UE) in a communication system, comprising:

[0191] a transceiver configured to transmit and / or receive signals;

[0192] a controller configured to control the UE to perform the method according to the embodiment of the present disclosure.

[0193] According to an embodiment of the present disclosure, there is provided a network device in a communication system, comprising:

[0194] a transceiver configured to transmit and / or receive signals;

[0195] a controller configured to control the network device to perform the method according to the embodiment of the present disclosure

[0196] The present disclosure provides a method and device for transmission of random access, which is beneficial for UE to combine newly configured random access resources for random access procedure in some scenarios, for example, in a network system supporting SBFD, the UE has new random access resources on the symbols for SBFD, and at the same time, there are random access resources configured in a legacy way (for example, random access resources for four-step random access, etc.), and / or, has new random access resources and / or data transmission resources on the SBFD symbols (for example, random access resources for two-step random access, etc.), and / or, when configuration for random access repetition transmission (for example, multiple transmissions for random access) is available, how to perform random access in such cases.

[0197] FIG. 1 illustrates an example wireless network according to various embodiments of the present disclosure;

[0198] FIGs. 2a and 2b illustrate example wireless transmission and reception paths according to the present disclosure;

[0199] FIG. 3a shows an example user equipment according to the present disclosure and fig. 3b shows an example base station according to the present disclosure; and

[0200] FIG. 4 shows a schematic diagram of a 4-step random access procedure;

[0201] FIG. 5 shows a schematic diagram of a 2-step random access procedure;

[0202] FIG. 6 shows a schematic block diagram of a communication device related to random access according to an embodiment of the present disclosure.

[0203] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

[0204] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0205] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0206] The term "include" or "may include" refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the present disclosure and does not limit one or more additional functions, operations, or components. The terms such as "include" and / or "have" may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but may not be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0207] The term "or" used in various embodiments of the present disclosure includes any or all of combinations of listed words. For example, the expression "A or B" may include A, may include B, or may include both A and B.

[0208] Unless defined differently, all terms used herein, which include technical terminologies or scientific terminologies, have the same meaning as that understood by a person skilled in the art to which the present disclosure belongs. Such terms as those defined in a generally used dictionary are to be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the present disclosure.

[0209] The technical solution in various embodiments of the present disclosure can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system Frequency division duplex (FDD) systems, time division duplex (TDD) systems, universal mobile telecommunications systems (UMTS), global interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems or new wireless (NR) systems, etc. In addition, the various embodiments of the present disclosure can be applied to future oriented communication technologies.

[0210] FIG. 1 illustrates an example wireless network 100 according to various embodiments of the present disclosure. The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0211] The wireless network 100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data networks.

[0212] Depending on a type of the network, other well-known terms such as "base station" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. And, depending on the type of the network, other well-known terms such as "mobile station", "user station", "remote terminal", "wireless terminal" or "user apparatus" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).

[0213] gNB 102 provides wireless broadband access to the network 130 for a first plurality of User Equipments (UEs) within a coverage area 120 of gNB 102. The first plurality of UEs include a UE 111, which may be located in a Small Business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. GNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within a coverage area 125 of gNB 103. The second plurality of UEs include a UE 115 and a UE 116. In some embodiments, one or more of gNBs 101-103 can communicate with each other and with UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.

[0214] The dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.

[0215] As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.

[0216] Although FIG. 1 illustrates an example of the wireless network 100, various changes can be made to FIG. 1. The wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement, for example. Furthermore, gNB 101 can directly communicate with any number of UEs and provide wireless broadband access to the network 130 for those UEs. Similarly, each gNB 102-103 can directly communicate with the network 130 and provide direct wireless broadband access to the network 130 for the UEs. In addition, gNB 101, 102 and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0217] FIGs. 2a and 2b illustrate example wireless transmission and reception paths according to the present disclosure. In the following description, the transmission path 200 can be described as being implemented in a gNB, such as gNB 102, and the reception path 250 can be described as being implemented in a UE, such as UE 116. However, it should be understood that the reception path 250 can be implemented in a gNB and the transmission path 200 can be implemented in a UE. In some embodiments, the reception path 250 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in embodiments of the present disclosure.

[0218] The transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230. The reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0219] In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The Serial-to-Parallel (S-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT / FFT used in gNB 102 and UE 116. The size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. The Parallel-to-Serial block 220 converts (such as multiplexes) parallel time-domain output symbols from the Size N IFFT block 215 to generate a serial time-domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at a baseband before switching to the RF frequency.

[0220] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116. The down-converter 255 down-converts the received signal to a baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. The Serial-to-Parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. The Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. The Parallel-to-Serial block 275 converts the parallel frequency-domain signal into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0221] Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.

[0222] Each of the components in FIGs. 2a and 2b can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, at least some of the components in FIGs. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware. For example, the FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, in which the value of the size N may be modified according to the implementation.

[0223] Furthermore, although described as using FFT and IFFT, this is only illustrative and should not be interpreted as limiting the scope of the present disclosure. Other types of transforms can be used, such as Discrete Fourier transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0224] Although FIGs. 2a and 2b illustrate examples of wireless transmission and reception paths, various changes may be made to FIGs. 2a and 2b. For example, various components in FIGs. 2a and 2b can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. Furthermore, FIGs. 2a and 2b are intended to illustrate examples of types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0225] FIG. 3a illustrates an example UE 116 according to the present disclosure. The embodiment of UE 116 shown in FIG. 3a is for illustration only, and UEs 111-115 of FIG. 1 can have the same or similar configuration. However, a UE has various configurations, and FIG. 3a does not limit the scope of the present disclosure to any specific implementation of the UE.

[0226] UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a transmission (TX) processing circuit 315, a microphone 320, and a reception (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor / controller 340, an input / output (I / O) interface 345, an input device(s) 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0227] The RF transceiver 310 receives an incoming RF signal transmitted by a gNB of the wireless network 100 from the antenna 305. The RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as for voice data) or to processor / controller 340 for further processing (such as for web browsing data).

[0228] The TX processing circuit 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.

[0229] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 in order to control the overall operation of UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 310, the RX processing circuit 325 and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0230] The processor / controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. The processor / controller 340 can move data into or out of the memory 360 as required by an execution process. In some embodiments, the processor / controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor / controller 340 is also coupled to an I / O interface 345, where the I / O interface 345 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I / O interface 345 is a communication path between these accessories and the processor / controller 340.

[0231] The processor / controller 340 is also coupled to the input device(s) 350 and the display 355. An operator of UE 116 can input data into UE 116 using the input device(s) 350. The display 355 may be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). The memory 360 is coupled to the processor / controller 340. A part of the memory 360 can include a random access memory (RAM), while another part of the memory 360 can include a flash memory or other read-only memory (ROM).

[0232] Although FIG. 3a illustrates an example of UE 116, various changes can be made to FIG. 3a. For example, various components in FIG. 3a can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. As a specific example, the processor / controller 340 can be divided into a plurality of processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although FIG. 3a illustrates that the UE 116 is configured as a mobile phone or a smart phone, UEs can be configured to operate as other types of mobile or fixed devices.

[0233] FIG. 3b illustrates an example gNB 102 according to the present disclosure. The embodiment of gNB 102 shown in FIG. 3b is for illustration only, and other gNBs of FIG. 1 can have the same or similar configuration. However, a gNB has various configurations, and FIG. 3b does not limit the scope of the present disclosure to any specific implementation of a gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structures as gNB 102.

[0234] As shown in FIG. 3b, gNB 102 includes a plurality of antennas 370a-370n, a plurality of RF transceivers 372a-372n, a transmission (TX) processing circuit 374, and a reception (RX) processing circuit 376. In certain embodiments, one or more of the plurality of antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0235] RF transceivers 372a-372n receive an incoming RF signal from antennas 370a-370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a-372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller / processor 378 for further processing.

[0236] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller / processor 378. TX processing circuit 374 encodes, multiplexes and / or digitizes outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.

[0237] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a-372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles. The controller / processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted. A controller / processor 378 may support any of a variety of other functions in gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0238] The controller / processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller / processor 378 supports communication between entities such as web RTCs. The controller / processor 378 can move data into or out of the memory 380 as required by an execution process.

[0239] The controller / processor 378 is also coupled to the backhaul or network interface 382. The backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A, the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections. When gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.

[0240] The memory 380 is coupled to the controller / processor 378. A part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs. In certain embodiments, a plurality of instructions, such as the BIS algorithm, are stored in the memory. The plurality of instructions are configured to cause the controller / processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0241] As will be described in more detail below, the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuit 374 and / or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.

[0242] Although FIG. 3b illustrates an example of gNB 102, various changes may be made to FIG. 3b. For example, gNB 102 can include any number of each component shown in FIG. 3a. As a specific example, the access point can include many backhaul or network interfaces 382, and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuit 374 and a single instance of the RX processing circuit 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0243] The time domain unit (also called time unit) in this application can be: an OFDM symbol, an OFDM symbol group or set (for example, composed of multiple OFDM symbols), a slot, a slot group or set (for example, composed of multiple slots), a subframe, a subframe group or set (for example, composed of multiple subframes), a system frame and a system frame group or set. It can also be an absolute time unit, such as 1 millisecond, 1 second, etc. A time unit can also be a combination of various granularities, such as N1 slots plus N2 OFDM symbols.

[0244] The frequency domain unit (also called frequency unit) in this application can be: a subcarrier, a subcarrier group or set (for example, composed of multiple subcarriers), a resource block (RB), which can also be called physical resource block (PRB), a resource block group or set (for example, composed of multiple RBs), a bandwidth part (BWP), a bandwidth part group or set (for example, composed of multiple BWPs), a band / carrier, and a band group / carrier group; it may also be an absolute frequency domain unit, such as 1 Hz, 1 kHz, etc.; the frequency domain unit may also be a combination of multiple granularities, such as M1 PRBs plus M2 subcarriers.

[0245] Exemplary embodiments of the present disclosure are further described below with reference to the accompanying drawings.

[0246] Text and drawings are provided as examples only to help readers understand the present disclosure. They are not intended and should not be construed to limit the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the disclosure herein, it is obvious to those skilled in the art that changes can be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0247] It can be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" used herein can also include plural forms unless specifically stated. It should be further understood that the word "comprising" used in the specification of this application refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may also exist. Furthermore, "connected" or "coupled" as used herein may include wireless connection or wireless coupling. As used herein, the phrase "and / or" includes all or any unit and all combinations of one or more associated listed items.

[0248] It can be understood by those skilled in the art that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms, such as those defined in general dictionaries, should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless they are specifically defined as here.

[0249] It can be understood by those skilled in the technical field that the "terminal" and "terminal equipment" used here include both the equipment of wireless signal receiver, which only has the equipment of wireless signal receiver without transmission capability, and the equipment of receiving and transmitting hardware, which has the equipment of receiving and transmitting hardware capable of bidirectional communication on the bidirectional communication link. Such devices may include a cellular or other communication device having a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; PCs (Personal Communications Service), which can combine voice, data processing, fax and / or data communication capabilities; PDA(Personal Digital Assistant), which may include RF receiver, pager, Internet / Intranet access, web browser, notepad, calendar and / or GPS(Global Positioning System) receiver; a conventional laptop and / or palmtop computer or other device having and / or including a radio frequency receiver. As used herein, "terminal" and "terminal equipment" can be portable, transportable, installed in vehicles (aviation, marine and / or land), or suitable and / or configured to operate locally, and / or operate in any other location on the earth and / or space in a distributed form. The "terminal" and "terminal device" used here can also be communication terminals, internet terminals and music / video playing terminals, such as PDA, mobile internet device (Mobile Internet Device) and / or mobile phone with music / video playing function, as well as smart TV, set-top box and other devices.

[0250] Without departing from the scope of the present invention, the term "send" in the present invention can be used interchangeably with "transmit", "report" and "notify".

[0251] Text and drawings are provided as examples only to help readers understand the present disclosure. They are not intended and should not be construed to limit the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, based on the disclosure herein, it is obvious to those skilled in the art that changes can be made to the illustrated embodiments and examples without departing from the scope of this disclosure.

[0252] The transmission link of wireless communication system mainly includes: downlink communication link from 5G gNB to User Equipment (UE) and uplink communication link from UE to network.

[0253] Nodes used for positioning measurement in wireless communication systems, such as current wireless communication systems, include: UE that initiates positioning request message, Location Management Function (LMF) that is used for UE positioning and send locationing assistance data, gNB or transmission-reception point (TRP) that broadcasts positioning assistance data and performs uplink positioning measurement, and UE that is used for downlink positioning measurement. In addition, the method of the present invention can also be extended to apply to other communication systems, such as automobile communication (V2X), such as sidelink communication, where the transmitting and receiving point or UE may be any device in V2X.

[0254] Transmission in a wireless communication system includes: transmission from a base station (gNB) to User Equipment (UE) (called downlink transmission), corresponding slots are called downlink slots, transmission from UE to the base station (called uplink transmission), and corresponding slots are called uplink slots.

[0255] In the downlink communication of wireless communication system, the system transmits synchronization signals and broadcast channels to users through synchronization signal / PBCH block (SSB) with periodicity, which is called SSB periodicity, or SSB burst periodicity. At the same time, the base station will configure a physical random access channel (PRACH) configuration period, during which a certain number of random access transmission occasions (also called random access occasions, PRACH transmission occasion, RO) are configured, valid ROs can be obtained through judgment on these configured ROs with certain validity rules; and it is met that all SSBs can be mapped to corresponding valid RO(s) in an association period (a certain time span), and all SSBs within one SSB periodicity can be mapped to the required random access resources in one SSB-to-RO mapping cycle, and there can be one or more mapping cycles in one association period. An SSB to RO association pattern period contains one or more association periods, and the association pattern from SSB to RO in each association pattern period is the same.

[0256] In the New Radio (NR) communication system, before the establishment of Radio Resource Control connection, for example, in random access procedure, the performance of random access directly affects the user's experience. In legacy wireless communication systems, such as LTE, LTE-Advanced, 5G or NR, random access procedure is used in many scenarios, such as initial link establishment, cell handover, re-establishment of uplink, RRC connection reestablishment and so on, and it is divided into contention-based Random Access) and contention-free random access according to whether users monopolize the preamble resources. Because in the contention-based random access, each user selects a preamble sequence from the same preamble sequence resource when trying to establish the uplink, it may appear that multiple users select the same preamble sequence and transmit it to the base station. Thus, contention resolution mechanism is an important research direction in random access, how to reduce the contention probability and how to quickly solve the contention that have occurred are the key metrics that affect the random access performance.

[0257] FIG. 4 shows a schematic diagram of a 4-step random access procedure. For example, contention-based random access procedure is divided into four steps, as shown in FIG. 4. In the first step, the user randomly selects a preamble (also called "preamble sequence" interchangeably herein) from a resource pool of preamble and transmits it to the base station. The base station performs correlation detection on the received signal, thereby identifying the preamble transmitted by the user; in the second step, the base station transmits a Random Access Response (RAR) to the user, including a random access preamble identifier, a timing advance instruction determined according to the time delay estimation between the user and the base station, a cell-radio network temporary identifier (C-RNTI), and time-frequency resources allocated for the user's next uplink transmission; the user should search for the PDCCH with the response based on the RA-RNTI associated with the PRACH occasion for transmitting the random access preamble. The RA-RNTI associated with the PRACH occasion (RO) for transmitting the random access preamble is calculated according to the following formula:

[0258] RA-RNTI = 1 + s_id + 14 t_id + 14 80 f_id + 14 80 8 ul_carrier_id,

[0259] where, s_id is the index of the first OFDM symbol of the PRACH occasion (0 s_id < 14), and t_id is the index of the first slot of the PRACH occasion in the system frame (0 t_id < 80), wherein for subcarrier spacing indication = {0, 1, 2, 3}, the subcarrier used to determine t_id is based on the value of specified in section 5.3.2 of TS38.211, for = {5, 6}, t_id is the index of 120 kHz slot containing the PRACH occasion in the system frame (0 t_id < 80), f_id is the index of the PRACH occasion in the frequency domain (0 f_id < 8), and ul_carrier_id is the UL carrier used for transmission of a random access preamble (0 for normal uplink carrier (NUL carrier), and 1 for supplementary uplink carrier (SUL carrier)).

[0260] In the third step, the user transmits a third message (message 3, Msg3) to the base station according to the information in the RAR. Msg3 contains information such as user terminal identification and RRC connection request, where the user terminal identification is unique to the user and is used for contention resolution; in the fourth step, the base station transmits a contention resolution identification to the user, including the identification of the user terminal that won the contention resolution. After detecting its own identification, the user upgrades the temporary C-RNTI to C-RNTI, transmits an ACK signal to the base station to complete the random access procedure, and waits for the scheduling from the base station. Otherwise, the user will start a new random access procedure after a delay.

[0261] FIG. 5 shows a schematic diagram of a 2-step random access procedure. As shown in FIG. 5, the two-step random access procedure only includes two steps:

[0262] Step 1: UE sends an uplink message A (MsgA) to the base station, and the message A may include information related to PRACH and / or PUSCH transmission;

[0263] Step 2: After receiving MsgA, the base station sends a downlink message B (MsgB) to the UE, which includes RAR and may be used for contention resolution.

[0264] In addition, 2-step random access may also include contention free random access. The contention free random access also includes the steps of UE sending MsgA and base station sending MsgB, while the preamble sequence included in MsgA is not randomly selected, but allocated by the base station. For contention-free random access procedure, because the base station knows the user identification, it can assign a preamble to the user. Therefore, when the user transmits a preamble, it does not need to randomly select a sequence, but will use the allocated preamble. After detecting the allocated preamble, the base station will transmit the corresponding random access response, including information such as timing advance and uplink resource allocation. After receiving the random access response, the user thinks that the uplink synchronization has been completed and waits for the further scheduling from the base station. Therefore, contention-free random access procedure only includes two steps: step 1 is to transmit a preamble; step 2 is to transmit the random access response.

[0265] Random access procedure is for example suitable for the following scenarios:

[0266] 1. Initial access under RRC_IDLE;

[0267] 2. Re-establish RRC connection;

[0268] 3. Cell handover;

[0269] 4. Downlink data arrives in RRC connected state and random access procedure is requested (when the uplink is asynchronous);

[0270] 5. Uplink data arrives in RRC connected state and random access procedure is requested (when the uplink is asynchronous or no resources are allocated to the scheduling request);

[0271] 6. Positioning.

[0272] In order to enhance the coverage of 5G wireless communication system or reduce the system delay, some communication systems adopt special duplex mode: for example, in TDD frequency band (or unpaired spectrum), the method of cross-division duplex (XDD) is adopted. Or, for another example, the method of subband non-overlapping full duplex (SBFD, or called "subband full duplex") is adopted. Subband non-overlapping full duplex means that the bandwidth of a base station (for example, carrier bandwidth) can be divided into more subbands than one. Wherein, the uplink and downlink ratios between the more subbands may be different. This has the effect that the base station can flexibly change the uplink / downlink ratio of a part of the bandwidth, for example, allocate it as full uplink (or full downlink), or the uplink ratio is large / downlink ratio is large. Therefore, the uplink / downlink transmission occasions of the UE in the time domain are increased, thereby enhancing the uplink coverage capability of the UE or reducing the time delay.

[0273] In addition, in some communication systems, it may also specially configure resources for random access for some other features, for example, for the network energy saving (NES) feature, resources for random access is configured specially, such as random access occasion (RO) resources in 4-step random access, or PRACH resources (such as RO resources and / or preamble resources) and PUSCH resources for sending MsgA in 2-step random access. Therefore, some random access resources may be newly / additionally configured for a specific feature in the communication system, so as to improve the performance of random access for the UE supporting or awaring the feature or the communication system supporting the feature.

[0274] In the description of the present disclosure, for the convenience of description, the random access resources configured for a specific feature (e.g., SBFD or NES and the like, which may also be called "second feature") are referred to as second type random access resource or second random access resource, which may include, for example, a second-RO, a second-PO (PUSCH Occasion), a second DMRS, a second preamble, etc.; such type of random access is called second type random access, second random access, random access for a second feature, and so on. The traditional / legacy random access is called first type random access, first random access, or normal random access, and the resource corresponding to such type of random access is called the first random access resource or normal random access resource, including, for example, the first-RO or normal RO, the first preamble or normal preamble, the first-PO or normal PO, the first DMRS or normal DMRS. It may be understood that the random access resource corresponding to the legacy random access is a resource that may be used or sensed by both the UE supporting the second feature and the UE not supporting the second feature (or called the normal UE).

[0275] In the following description, for convenience of describing and easy understanding, the description related to the second type random access will be made by taking subband non-overlapping full duplex (SBFD) as an example of the second feature. Therefore, although the following description is for SBFD, its technical principle and scheme essence may be equally or similarly applied to the corresponding aspects of random access for other features except SBFD.

[0276] The inventors found that in this kind of communication system with the second feature (such as SBFD), how to perform random access in combination with the newly emerging uplink resources through subband non-overlapping full duplex is a problem to be solved. In addition, the present disclosure may also solve other problems related to performing random access transmission by using newly emerging uplink resources, such as but not limited to: for supporting two-step random access transmission in SBFD system, the problem of configuration of PUSCH of message A and the problem of mapping between msgA PRACH and msgA PUSCH; and the problem of supporting multiple random access transmissions (for example, random access transmission repetition) in SBFD system, in which the problem of determining the resources required for random access repetition transmissions and so on. Moreover, the problems that may be solved by this disclosure are not limited to those mentioned in the above and the following description, but may also solve all problems that may be actually solved according to the essence of the technology of this disclosure.

[0277] In an embodiment of the present invention, a method and device for transmission of random access will be introduced, which is beneficial for UE to combine newly configured random access resources for random access procedure in some scenarios, for example, in a network system supporting SBFD, the UE has new random access resources on the symbols for SBFD, and at the same time, there are random access resources configured in a legacy way (for example, random access resources for four-step random access, etc.), and / or, has new random access resources and / or data transmission resources on the SBFD symbols (for example, random access resources for two-step random access, etc.), and / or, when configuration for random access repetition transmission (for example, multiple transmissions for random access) is available, how to perform random access in such cases. As described above, the methods of the embodiments of the present disclosure may be extended to or replaced by other duplex modes, such as full duplex, etc., and may also be extended to or replaced by other features, such as the case where random access resource has been configured individually for network energy saving, and the like. In this disclosure, SBFD is used to explain the solution, but this is only exemplary and is for the convenience of the inventor to fully describe his technical concept and technical principle, and is not intended to limit the principle of this disclosure only to SBFD-related random access.

[0278] It may be understood that although most of the descriptions in this disclosure describe the solution with SBFD-related random access, the principles disclosed in this disclosure may be equally applied to scenarios where random access resources are configured for other features. For example, the technology of the present disclosure may also be applied to a scenario where random access resources are separately configured for network energy saving (NES). Therefore, the present disclosure may be applied to at least a scenario in which random access resources are configured for a specific feature, such as SBFD, NES, etc. For the convenience of description, the random access associated with a specific feature may be called "second random access", the resources configured for the second random access may be called "second type random access resources" (for example, second type RO) and so on, the legacy random access may be called "normal random access" or "first random access" and so on, and the corresponding resources may be called "normal random access resources" (for example, normal RO) or "first type random access resources" (for example, first type RO).

[0279] In the present invention, SSB is described as a downlink reference signal related to random access, but this is only an example, and SSB may also be replaced by other reference signals, such as CSI-RS, PRS, etc.

[0280] The method provided by the invention may include a combination of one or more of the following operations:

[0281] ● UE receives configuration information related to random access transmitted by other node (such as a network device, which may include a base station, etc.), wherein:

[0282] ■The configuration information related to random access includes a combination of one or more of:

[0283] ◆The first type random access configuration information, or called the first configuration information related to normal random access, such as pre-existing or existing random access configuration information, for example, configuration information for four-step random access, configuration information for two-step random access, etc. In the invention, the method is illustrated by taking the configuration of four-step random access as an example, which can be expanded or replaced by random access configuration for other features; wherein, the first type random access configuration information at least includes a random access configuration index, the number of frequency domain ROs for random access, the frequency domain start location of the first-RO, the root sequence index of preambles, the number of preambles on one RO, the mapping ratio of SSB-RO (ssbperRO, for example, information about how many SSBs are mapped on one RO), etc. In the description of this disclosure, an RO obtained according to the first type random access configuration information is expressed as a normal RO; in particular, valid normal ROs may be obtained by judgement on the configured normal ROs according to existing validity rules, which is expressed as valid normal ROs; wherein, the existing validity rules include: an RO on a random access slot is valid if it is on the uplink symbol (or uplink part) in TDD configuration; an RO on a random access slot is a valid RO if it is not earlier than SSB on the slot and / or the RO is at least N symbols away from the last downlink symbol and / or the last SSB symbol on the current slot; wherein

[0284] ⇒ For the configuration information for two-step random access, it also includes the PUSCH resource configuration for message A of two-step random access. In the present invention, the PUSCH resource configuration for message A of two-step random access is expressed as PUSCH resource configuration for message A of normal two-step random access, including at least one of: PUSCH occasion (PO) configuration, the time-domain and / or frequency-domain start location of PO in a configuration (such as start symbol index, or start PRB index, etc., or obtained through the time-domain gap and / or frequency-domain gap from the corresponding PRACH slot (such as the end location or start location of the PRACH slot)), the number of POs in the time domain, the number of POs in the frequency domain, time interval between POs in time domain and frequency gap between POs in frequency domain, in an configuration; the number of time domain units and / or frequency domain units of a PO; the number of DMRS resources (including the number of DMRS sequences and / or the number of ports) on a PO, mapping configuration (including mapping ratio, etc.) between random access resources (PRACH resources of msgA, including preamble and / or RO) and PUSCH resources (including PO and / or DMRS resources) of message A; and / or;

[0285] ⇒ For the first type random access configuration information, it also includes configuration information for repetition of random access transmission. For example, one random access transmission includes N1_repetition (N1_repetition is a configured or predefined positive integer) random access preamble transmissions (for example, N1_repetition preambles are transmitted on corresponding N1_repetition ROs, the N1_repetition ROs are called an RO set corresponding to the N1_repetition value), and the N1_repetition preambles may be the same preambles and / or different preambles; UE determines or obtains the resources of the RO set for repetition transmission of random access transmission according to the obtained configuration information related to random access repetition transmission and a certain rule;

[0286] ◆The second type random access configuration information, or called the second configuration information related to the second random access, the second random access is related to a second feature, such as SBFD, NES, etc. but not limited thereto. In this description, SBFD is taken as an example of the second feature for convenience of expression and easy understanding. The second type random access configuration information can also be called, for example, new random access configuration information (or configuration information different from the existing random access configuration information). For example, new SBFD random access configuration information can be obtained through the configuration of SBFD. In this invention, SBFD random access configuration information is used to explain the method, which can be extended to other random access configuration information; wherein, the second type random access configuration information includes at least one of the following:

[0287] ⇒ The related configuration of time domain resources in SBFD UL subband, such as the related configuration of SBFD symbols; for example, through the configuration, UE can know the start location of SBFD symbols, the number of SBFD symbols within a time period, and the size of the time period, illustratively, further including the repetition period of the time period, expressed as an SBFD configuration period, wherein the SBFD configuration period can be the same as the TDD pattern configuration period, or an integer multiple of the TDD pattern configuration period, and / or be the same as the random access related period, or an integer multiple of the random access related period; wherein the random access related period includes at least one of the following: a random access configuration period, a mapping cycle of SSB-RO, an association period of SSB-RO and an association pattern period of SSB-RO; for example, a time period is a slot (e.g., expressed as an SBFD slot), the start location of symbol of SBFD starts with symbol 0 in a slot, and the number of SBFD symbols is 6 symbols; if the SBFD configuration period is 10ms, there is an SBFD slot in 10ms, and there are six SBFD symbols starting from symbol 0 in the SBFD slot; it can be expanded to the case where the repetition period is the same as the time period, and / or one repetition period contains multiple SBFD slots, etc.; where SBFD symbols can be replaced by SBFD time units; FIG. 5 shows an example diagram of configuration SBFD.

[0288] ⇒ The related configuration of frequency domain resources in SBFD UL subband, for example, through the related configuration information, the UE can obtain the start point of the configured SBFD UL subband in the frequency domain, the number of frequency domain units occupied (for example, the bandwidth of the SBFD UL subband), and / or the end point in the frequency domain;

[0289] ⇒ Optionally, the SBFD random access configuration information, including one or more of:

[0290] - Separate SBFD random access configuration information, including one or more of:

[0291] √SBFD dedicated random access configuration index; the random access configuration index indicates one or more of: random access preamble format, random access configuration period, number and location of random access frames in the random access configuration period, index of subframe or slot in a random access frame, start symbol location of random access preamble in a subframe or slot, number of random access slots in a random access subframe, number of random access occasions in a random access slot, number of OFDM symbols occupied in a random access occasion;

[0292] √SBFD dedicated number of frequency domain ROs for random access;

[0293] √SBFD dedicated frequency domain start location for random access; for example, the frequency domain start location of the first-RO of SBFD in frequency domain, and other ROs in frequency domain are calculated / derived according to the location of the first-RO, the size of frequency domain resources occupied by one RO, and / or the frequency domain gap between ROs;

[0294] √SBFD dedicated random access preamble root sequence index;

[0295] √SBFD dedicated number of random access preambles, for example, the number of SBFD dedicated preambles on an RO;

[0296] √SBFD dedicated power related configuration, including at least one of the following: SBFD dedicated preamble target received power, SBFD dedicated path loss compensation coefficient alpha (for example, alphaХ path loss, when alpha is less than 1, indicating partial path loss compensation; alpha=1, indicating all path loss compensation; alpha>1, indicating excess path loss compensation, such scenario is beneficial to additionally increase the UE's power when transmitting a preamble on SBFD RO when using the normal preamble target received power); SBFD dedicated power increasing delta value, SBFD dedicated power ramping priority and / or step, etc.; when UE uses SBFD RO for preamble transmission, it uses the above-mentioned SBFD dedicated power related configuration; the transmission power P is determined according to one or more of the target received power P0, alpha path loss, delta, power ramping step retransmission number;

[0297] - Optionally, the SBFD random access configuration information shares the first type random access configuration information, for example, the SBFD random access configuration information reuses the first type random access configuration information, for example, the random access configuration index of SBFD is the same as the first type random access configuration index, or;

[0298] - SBFD dedicated random access message A PRACH configuration information, which may be similar to the above-mentioned separate SBFD random access configuration information, for example, may include at least one of: SBFD dedicated random access configuration index, SBFD dedicated number of frequency domain ROs for random access, SBFD dedicated frequency domain start location for random access, SBFD dedicated random access preamble root sequence index, SBFD dedicated number of random access preambles, and SBFD dedicated power related configuration. For details, please refer to the above detailed description in combination with what may be included in "separate SBFD random access configuration information", which is not repeated here.

[0299] - SBFD dedicated random access message A PUSCH configuration information, for example, an SBFD msgA PUSCH configuration, and configuration information of such a configuration includes at least one of:

[0300] √ SBFD PUSCH occasion (SBFD PO) configuration, the time-domain and / or frequency-domain start location of SBFD PO in a configuration (for example, the start symbol index, or the start PRB index, etc., or obtained through the time-domain interval and / or frequency-domain gap from the corresponding SBFD or normal PRACH slot),

[0301] √ The number of SBFD POs in time domain,

[0302] √ The number of SBFD POs in frequency domain,

[0303] √ Time domain interval between SBFD POs in time domain,

[0304] √ Frequency domain gap between SBFD POs in frequency domain;

[0305] √ The number of time domain units and / or frequency domain units of an SBFD PO;

[0306] √ The number of SBFD DMRS resource on an SBFD PO (including the number of DMRS sequences and / or the number of ports),

[0307] √ Mapping configuration (including mapping ratio, etc.) between SBFD and / or normal random access resources (PRACH resources of msgA, including preambles and / or ROs) and SBFD PUSCH resources (including SBFD POs and / or SBFD DMRS resources) of message A;

[0308] - SBFD dedicated configuration information for random access transmission repetition, which at least includes

[0309] √ random access transmission includes N2_repetition (N2_repetition is configured dedicatedly for SBFD or is a positive integer predefined dedicatedly for SBFD) random access preamble transmissions (for example, N2_repetition preambles are transmitted on corresponding N2_repetition ROs, the N2_repetition ROs are called an SBFD RO set corresponding to the N2_repetition value), the N2_repetition preambles may be the same preambles and / or different preambles;

[0310] ●The UE judges whether the configured random access occasions are valid, including one or more of:

[0311] ■For random access occasions configured for SBFD (including cases of SBFD dedicated random access configuration information or sharing the first type random access configuration information), which is expressed as SBFD RO, one or more of the following validity judgments are used:

[0312] ◆judging SBFD ROs according to the existing validity rules described in the above first type random access configuration information to obtain valid ROs or valid SBFD ROs;

[0313] ◆when all symbols of an RO are completely within the SBFD symbols, the RO is a valid RO, or a valid SBFD RO; for example, when part or all of the symbols of an RO are not within the SBFD symbols, the RO is an invalid RO or an invalid SBFD RO;

[0314] ◆when all symbols of an RO are on SBFD symbols and flexible symbols, the RO is a valid RO and a valid SBFD RO; for example, when part or all of the symbols of an RO are not within the SBFD symbols or flexible symbols, the RO is an invalid RO or an invalid SBFD RO;

[0315] ◆when the interval between the first symbol of an RO and the last SBFD symbol in a slot is greater than (or not less than) a time unit interval threshold, the RO is a valid RO; for example, when the interval between (the start location of) the first symbol of an RO and (the end location of) the last SBFD symbol in a slot is not more than (or less than) a time unit interval threshold, the RO is an invalid RO or an invalid SBFD RO;

[0316] ◆when the frequency domain units of an RO are within SBFD UL subband, including all frequency domain units of an RO are within SBFD UL subband, or at least one or X frequency domain units of an RO are within SBFD UL subband; the RO is a valid RO; or a valid SBFD RO; where X is an integer greater than 1.

[0317] ◆when an RO is not mapped to SSB (or other downlink signals) in a certain time period, the RO is an invalid RO; the range of the certain time period includes a mapping cycle, or an association period, or an association pattern period of SSB-RO, a mapping cycle, or an association period, or an association pattern period of SSB-SBFD RO, or a time unit (such as a slot), or a random access configuration period, or a TDD pattern configuration period, or an SBFD configuration period;

[0318] ● Optionally, the UE determines whether the configured SBFD PUSCH occasions are valid, including one or more of:

[0319] ■ For a PUSCH occasion configured for SBFD, which is expressed as SBFD PO, and / or a normal PO, one or more of the following validity judgments are used:

[0320] ◆ When all symbols of a PO are completely within SBFD symbols, the PO is a valid PO, or a valid SBFD PO; For example, when part or all of the symbols of a PO are not within the SBFD symbols, the PO is an invalid PO or an invalid SBFD PO;

[0321] ◆When all symbols of a PO are on SBFD symbols and flexible symbols, the PO is a valid PO or a valid SBFD PO; For example, when part or all of the symbols of a PO are not within the SBFD symbols or flexible symbols, the PO is an invalid PO or an invalid SBFD PO;

[0322] ◆When the interval between the first symbol of a PO and the last SBFD symbol in the slot where the PO is located or in the PUSCH slot is greater than (or not less than) a time unit interval threshold, the PO is a valid PO; For example, when the interval between the first symbol of a PO (e.g., the start location of the symbol) and the last SBFD symbol in a slot (e.g., the end location of the symbol) is not more than (or less than) a time unit interval threshold, the PO is an invalid PO or an invalid SBFD PO;

[0323] ◆When a frequency domain unit of a PO is within SBFD UL subband, including all frequency domain units of a PO are within SBFD UL subband, or at least one or X frequency domain units of a PO are within SBFD UL subband; the PO is a valid PO; or a valid SBFD PO; where X is an integer greater than 1

[0324] ◆When a PO is not mapped to a random access resource, the PO is an invalid PO;

[0325] ◆When a PO does not overlap with any valid RO (including normal valid RO or SBFD valid RO) in time domain and / or frequency domain, the PO is a valid PO, otherwise it is an invalid PO. Alternatively, if there is a valid RO overlapping with a PO, the PO is an invalid PO.

[0326]

[0327] ●The UE maps SSB to valid SBFD random access occasions, including one or more of:

[0328] ■obtaining information related to mapping of SSB-RO according to the first type random access configuration information, including one or more of:

[0329] ◆mapping cycle of SSB-RO

[0330] ◆association period of SSB-RO

[0331] ◆association pattern period of SSB-RO

[0332] ■obtaining information related to mapping of SSB-SBFD RO according to SBFD random access configuration information, including one or more of:

[0333] ◆mapping cycle of SSB-SBFD RO

[0334] ◆association period of SSB-SBFD RO

[0335] ◆association pattern period of SSB-SBFD RO

[0336] ■obtaining the mapping of SSB-SBFD RO according to the first type random access configuration information and the SBFD random access configuration information, including one or more of:

[0337] ◆mapping SSB to the valid SBFD ROs in the association pattern period of SSB-RO, according to the obtained association pattern period of SSB-RO and the mapping ratio of SSB-RO in the first type random access configuration information, and the valid SBFD ROs in the association pattern period of SSB-RO, as illustrated in FIG. 6. In the first type random access configuration, the mapping ratio of SSB to RO is 1:1, for example, one RO is mapped with one SSB, and there are currently two SSB (SSB0, 1), according to there are two valid SBFD ROs in the SSB-RO association pattern period obtained in the first type random access configuration information, these two SSBs are mapped to two valid SBFD ROs correspondingly according to the same mapping ratio;

[0338]

[0339] ◆mapping SSB to valid SBFD ROs in the association pattern period of SSB-RO, according to the obtained association pattern period of SSB-RO, the mapping ratio of SSB-SBFD RO in SBFD random access configuration information, and the valid SBFD ROs in the association pattern period of SSB-RO;

[0340] ◆according to the obtained association pattern period of SSB-RO and the valid SBFD ROs in the association pattern period of SSB-RO, and the SSB-RO resource list configured by other nodes (network device), each element in the list includes an SSB index and the index of SBFD RO mapped by the SSB index, and the index of SBFD RO is obtained from the logical index of the valid SBFD RO in the association pattern period of SSB-RO;

[0341] ◆When there are remaining SBFD ROs and / or preamble resources which cannot form a complete mapping cycle or association period after an integer number of SSBs are mapped in the above association pattern period, the remaining SBFD ROs and preamble resources are invalid RO resources and / or are not mapped with any SSB;

[0342] ◆The above association pattern period can be replaced by an association period or a mapping cycle, or other time units, such as one or more slots; or one or more random access configuration periods, etc.; or a SBFD configuration period;

[0343] ● Optionally, for a UE that supports or is aware of SBFD (e.g., SBFD-support / aware UE), mapping msgA PRACH resource to the msgA PUSCH resource, specifically including at least one of:

[0344] ◆ Each consecutive number of N_preamble preamble indexes from valid SBFD PRACH occasions in a PRACH slot:

[0345] ⇒ first, in increasing order of preamble indexes within a single SBFD PRACH occasion

[0346] ⇒ second, in increasing order of frequency resource indexes for frequency multiplexed SBFD PRACH occasions

[0347] ⇒ third, in increasing order of time resource indexes for time multiplexed SBFD PRACH occasions within a PRACH slot

[0348] are mapped to a valid SBFD PUSCH occasion and the associated SBFD DMRS resource and / or a valid normal PUSCH occasion and the associated normal DMRS resource:

[0349] ⇒ first, in increasing order of frequency resource indexes f_id for frequency multiplexed SBFD PUSCH occasions and / or a valid normal PUSCH occasion

[0350] ⇒ second, in increasing order of DMRS resource indexes within a SBFD PUSCH occasion, where a SBFD DMRS resource index DMRS_id is determined first in an ascending order of a SBFD DMRS port index and second in an ascending order of a SBFD DMRS sequence index, or in increasing order of DMRS resource indexes within a valid normal PUSCH occasion, where a normal DMRS resource index DMRS_id is determined first in an ascending order of a normal DMRS port index and second in an ascending order of a normal DMRS sequence index,

[0351] ⇒ third, in increasing order of time resource indexes t_id for time multiplexed SBFD PUSCH occasions and / or normal PUSCH occasions within a PUSCH slot

[0352] ⇒ fourth, in increasing order of indexes for N_s PUSCH slots, where N_s is the number of configured PUSCH slots in a msgA PUSCH configuration

[0353] It can be understood that, the above-mentioned SBFD PUSCH occasion may be described as a valid SBFD PUSCH occasion instead. Wherein, N_preamble =ceil(T_preamble / T_PUSCH), T_preamble is a total number of valid SBFD PRACH occasions per association pattern period multiplied by the number of preambles per valid SBFD PRACH occasion and / or a total number of valid normal PRACH occasions per association pattern period multiplied by the number of preambles per valid normal PRACH occasion, and T_PUSCH is a total number of valid SBFD PUSCH occasions per PUSCH configuration per association pattern period multiplied by the number of SBFD DMRS resource indexes per valid SBFD PUSCH occasion and / or a total number of valid normal PUSCH occasions per PUSCH configuration per association pattern period multiplied by the number of normal DMRS resource indexes per valid normal PUSCH occasion.

[0354] ● Optionally, for a UE that supports or is aware of SBFD (e.g., SBFD-support / aware UE), determining SBFD RO set resource for repetition transmission of random access transmission according to the obtained configuration information and a certain rule, specifically including at least one of:

[0355] ■ determining the RO set by only using SBFD valid ROs or only using normal valid ROs; SBFD RO set based on SBFD valid ROs and / or normal RO set based on normal valid ROs may be obtained;

[0356] ◆ Alternatively, it is possible to first determine the RO set by only using the normal valid ROs to obtain an normal RO set based on the normal valid ROs, such operation includes obtaining a time period of normal RO sets; wherein, resource for a normal RO set corresponding to the value of the number of repetitions N1_repetition configured for normal random access will repeat in each of the time period of RO sets, for example, the set of valid normal ROs repeats with this time period for N1_repetition (or it may be expressed as, the set of valid normal ROs repeats every N1_repetition time period); then, based on the SBFD RO resources within the time period of normal RO sets, determining the RO set for the value of the number of repetitions N2_repetition configured for the SBFD PRACH, to obtain the SBFD RO set resource. The advantage of this method is that the obtained SBFD RO set may repeat with the same time period as that of the normal RO set resource (for example, the time period of normal RO sets), and the time period of normal RO sets is also the time period of RO sets obtained by normal UE (for example, UE that cannot support SBFD), so that all UE in the network may be sure to get the same time period of RO sets, which is beneficial to network scheduling and coordination;

[0357] ■ determining the RO set by using SBFD valid ROs and normal valid ROs jointly, for example, consider SBFD valid ROs and normal valid ROs as a whole resource; for example, UE will get a mixed RO set, which may include SBFD valid RO(s) and normal valid RO(s);

[0358] ■ Optionally, when the preamble format of the SBFD random access configuration is the same as that of the normal random access configuration (or the number of symbols occupied by the preamble format is the same), and / or when the number of repetitions N1_repetition for the normal PRACH configuration is the same as the number of repetitions N2_repetition for the SBFD PRACH configuration, the above-mentioned determining of a RO set by using SBFD valid RO and normal valid RO together may be performed; when the preamble format of the SBFD random access configuration is different from that of the normal random access configuration (or the number of symbols occupied by the preamble format is different), and / or when the repetition number N1_repetition for the normal PRACH configuration is different from the repetition number N2_repetition for the SBFD PRACH configuration, then the determining of a RO set by only using SBFD valid ROs or only using normal valid Ros may be performed, for example, the resources for the SBFD RO set and the normal RO set are determined separately.

[0359] ● The UE selects a random access occasion and a preamble to perform transmission according to the determined SBFD random access resources and / or the first type random access resources and the SSB selected by the UE or designated; specifically, comprises at least one of the following operations:

[0360] ■ The UE determines the transmission power of the preamble, and the transmission pow of the preamble is obtained according to the preamble target power (PREAMBLE_RECEIVED_TARGET_POWER); the preamble target power is determined according to at least one of: the configured initial preamble target powerpreambleReceivedTargetPower_initiate, and the preamble format power change value DELTA_PREAMBLE, the cumulative power ramp value P_ramp, and the random access type power differencePOWER_OFFSET_2STEP_RA(such as the cumulative difference of power ramp upon the transition from two-step random access to four-step random access); which comprises at least one of the following operations:

[0361] ◆ For random access transmission using normal and / or SBFD random access resources, the configuration information that the UE may receive also includes at least one of:

[0362] ⇒ normal initial preamble target powerpreambleReceivedTargetPower_initiate_normal;

[0363] ⇒ normal power ramping stepRamping_step_normal;

[0364] ⇒ SBFD initial preamble target powerpreambleReceivedTargetPower_initiate_SBFD;

[0365] ⇒ SBFD power ramping step Ramping_step_SBFD;

[0366] ⇒ commonpreambleReceivedTargetPower_initiate(between normal random access and SBFD random access)

[0367] ⇒ common power ramping step Ramping_step (between normal random access and SBFD random access)

[0368] ◆ The UE counts the power ramping when using normal random access resources and SBFD random access resources for transmission respectively. For example, the UE uses two counters, one is the power ramp counter P_normalRACH counter which records the random access transmission using normal random access resources; one is the power ramp counter P_SBFDRACH counter which records the random access transmission using SBFD random access resources; the specific operation includes at least one of:

[0369] ⇒ P_normalRACH and / or P_SBFDRACH are initially set to 1;

[0370] ⇒ When the random access transmission performed by the UE uses normal random access resources (normal RO and / or normal preamble) and / or a first condition is satisfied, then the P_normalRACH is increased by a first set value, for example, 1; optionally, the normal random access resource being used may be the random access resource used by the latest (e.g. the previous one) transmission that the UE has completed or the random access resource currently selected to be used for ongoing transmission;PREAMBLE_RECEIVED_TARGET_POWERmay be determined according topreambleReceivedTargetPower_initiate_normaland the cumulative power ramp value P_ramp, and the cumulative power ramp value P_ramp may be determined by P_normalRACH (and / or P_SBFDRACH), Ramping_step_normal (and / or Ramping_step_SBFD), which may bePREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_initiate_normal+DELTA_PREAMBLE+ P_ramp+POWER_OFFSET_2STEP_RA; Where P_ramp may be at least one of:

[0371] - (P_normalRACH-1) Ramping_step_normal，

[0372] - (P_normalRACH-1) Ramping_step_normal+ P_SBFDRACH Ramping_step_SBFD，

[0373] - (P_normalRACH+P_SBFDRACH-1) Ramping_step, for example, using the common power ramping step Ramping_step (between normal random access and SBFD random access),

[0374] ⇒ When the random access transmission performed by the UE uses SBFD random access resources (SBFD RO and / or SBFD preamble), and / or the first condition is satisfied, then P_SBFDRACH is increased by a second set value, for example, 1; optionally, the SBFD random access resource random access resource being used may be the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used for the ongoing transmission; then thePREAMBLE_RECEIVED_TARGET_POWERmay be determined according topreambleReceivedTargetPower_initiate_SBFDand the cumulative power ramp value P_ramp, the cumulative power ramp value P_ramp may be determined by P_SBFDRACH (and / or P_normalRACH), Ramping_step_SBFD (and / or P_normalRACH), which may bePREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_initiate_SBFD + DELTA_PREAMBLE +P_ramp + POWER_OFFSET_2STEP_RA; where P_ramp may be one of:

[0375] - (P_SBFDRACH - 1) Ramping_step_SBFD，

[0376] - P_normalRACH Ramping_step_normal+(P_SBFDRACH - 1) Ramping_step_SBFD，

[0377] - (P_normalRACH+P_SBFDRACH-1) Ramping_step, for example, using the common power ramping step Ramping_step (between normal random access and SBFD random access);

[0378] ⇒preambleReceivedTargetPower_initiate_SBFDmay be replaced by the commonpreambleReceivedTargetPower_initiate(between normal random access and SBFD random access)

[0379] ⇒ The first condition includes at least one of:

[0380] - the selected SSB index or the indicated SSB index received by the UE has not changed, and the SSB may be replaced by other downlink reference signals such as CSI-RS, PRS, etc.

[0381] - the uplink transmit beam (e.g., spatial domain transmission filter, or spatial domain filter for short) has not changed;

[0382] √ Particularly, when the uplink transmit beam (e.g., spatial domain transmission filter, or spatial domain filter for short) has not changed, do not transfer a power ramping suspension indication to a higher layer, otherwise, when the uplink transmit beam changes, for example, the current beam is different from the previous beam, the lower layer of the UE transfers a transmission power ramping suspension indication to the higher layer;

[0383] - no power ramping suspension indication transferred from the lower layer is received;

[0384] ◆ UE uniformly / jointly counts the power ramping when using normal random access resources and using SBFD random access resources for transmission. For example, UE uses a common counter, which is a power ramp counter P_RACH counter for recording random access transmission using normal and / or SBFD random access resources; the specific operation includes at least one of:

[0385] ⇒ P _ RACH is initially set to 1;

[0386] ⇒ For random access transmission using normal and / or SBFD random access resources, the configuration information that the UE may receive also includes at least one of:

[0387] - normal initial preamble target powerpreambleReceivedTargetPower_initiate_normal;

[0388] -normal power ramping stepRamping_step_normal

[0389] - SBFD initial preamble target powerpreambleReceivedTargetPower_initiate_SBFD;

[0390] - SBFD power ramping step Ramping_step_SBFD

[0391] - commonpreambleReceivedTargetPower_initiate(between normal random access and SBFD random access)

[0392] - common power ramping step Ramping_step (between normal random access and SBFD random access)

[0393] ⇒ When the random access transmission performed by the UE uses normal or SBFD random access resources, and / or the first condition is satisfied, then P_RACH is increased by a third set value, for example, 1; optionally, the normal or SBFD random access resource random access resource being used may be the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used for the ongoing transmission; then thePREAMBLE_RECEIVED_TARGET_POWERmay be determined according topreambleReceivedTargetPower_initiateand the cumulative power ramp value P_ramp, the cumulative power ramp value P_ramp may be determined by P_RACH, Ramping_step, which may bePREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_initiate + DELTA_PREAMBLE +P_ramp + POWER_OFFSET_2STEP_RA; where P_ramp may be (P_RACH - 1) Ramping_step, in which Ramping_step may be replaced by Ramping_step_SBFD or Ramping_step_normal;

[0394] ⇒ The first condition includes at least one of the following:

[0395] - the selected SSB index or the indicated SSB index received by the UE has not changed, SSB may be replaced by other downlink reference signals such as CSI-RS, PRS, etc.;

[0396] - the uplink transmit beam (e.g., spatial domain transmission filter, or spatial domain filter for short) has not changed;

[0397] √ Particularly, when the uplink transmit beam (e.g., spatial domain transmission filter, or spatial domain filter for short) has not changed, do not transfer a power ramping suspension indication to a higher layer, otherwise, when the uplink transmit beam changes, for example, the current beam is different from the previous beam, the lower layer of the UE transfers a transmission power ramping suspension indication to the higher layer;

[0398] - no power ramping suspension indication transferred from the lower layer is received;

[0399] ⇒ When the SBFD random access resources (SBFD RO and / or SBFDpreamble) is used by the UE for random access transmission, thepreambleReceivedTargetPower_initiatemay be replaced by SBFD initial preamble target powerpreambleReceivedTargetPower_initiate_SBFD, optionally, the SBFD random access resource being used may be the random access resource used in the latest (e.g. previous one) transmission that UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0400] ⇒ When the random access transmission by the UE uses normal random access resources (normal RO and / or normal preamble), thepreambleReceivedTargetPower_initiatemay be replaced by normal initial preamble target powerpreambleReceivedTargetPower_initiate_normal, optionally, the normal random access resource being used may be the random access resource used in the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0401] ◆ UE uniformly / jointly accumulates the power ramping when using normal random access resources and using SBFD random access resources for transmission, for example, UE uses a common P_ramp accumulation method; the specific operations include at least one of:

[0402] ⇒ For random access transmission using normal and / or SBFD random access resources, the configuration information that the UE may receive further includes at least one of:

[0403] - normal initial preamble target powerpreambleReceivedTargetPower_initiate_normal;

[0404] -normal power ramping stepRamping_step_normal

[0405] - SBFD initial preamble target powerpreambleReceivedTargetPower_initiate_SBFD;

[0406] - SBFD power ramping step Ramping_step_SBFD

[0407] - commonpreambleReceivedTargetPower_initiate(between normal random access and SBFD random access)

[0408] - common power ramping step Ramping_step (between normal random access and SBFD random access)

[0409] ⇒ P _ ramp is initially set to 0 or other fixed value;

[0410] ⇒ When the random access transmission by the UE uses SBFD random access resources (SBFD RO and / or SBFD preamble), P_ramp is increased by Ramping _ step _ SBFD; for example, P_ramp=P_ramp+Ramping_step_SBFD, where Ramping_step_SBFD may be replaced by the common power ramping step Ramping _ step (between normal random access and SBFD random access); and / or, thepreambleReceivedTargetPower_initiatemay be replaced by the SBFD initial preamble target powerpreambleReceivedTargetPower_initiate_SBFD, optionally, the SBFD random access resource being used may be the random access resource used in the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0411] ⇒ When the random access transmission by the UE uses normal random access resources (common RO and / or normal preamble), P_ramp is increased by Ramping _ step _ normal; for example, P_ramp=P_ramp+Ramping_step_normal, where Ramping _ step _ normal may be replaced by a common power ramping step Ramping _ step (between normal random access and SBFD random access); and / orpreambleReceivedTargetPower_initiatemay be replaced by normal initial preamble target powerpreambleReceivedTargetPower_initiate_normal, optionally, the normal random access resource being used may be the random access resource used in the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0412] ⇒PREAMBLE_RECEIVED_TARGET_POWERmay be determined according topreambleReceivedTargetPower_initiateand cumulative power ramping value P_ramp, specifically, may bePREAMBLE_RECEIVED_TARGET_POWER=preambleReceivedTargetPower_initiate + DELTA_PREAMBLE +P_ramp + POWER_OFFSET_2STEP_RA; where P_ramp is as described above;

[0413] ■ The UE determines whether the limit of the number of transmission times is satisfied, and in case that it is not exceeded (or less than) the maximum number of transmission times, the UE may perform transmission of random access, otherwise, the UE reports a random access error; which comprises at least one of the following operations:

[0414] ◆ The UE respectively counts the transmission using normal random access resources and using SBFD random access resources. For example, the UE uses two counters, one is a T_normalRACH counter that records the random access transmission using normal random access resources; one is a T_SBFDRACH counter that records random access transmission using SBFD random access resources; the specific operations include at least one of:

[0415] ⇒ T _ normalrach and / or T_SBFDRACH are initially set to 1;

[0416] ⇒ When the random access transmission by the UE uses normal random access resources (for example, normal RO and / or normal preamble), T_normalRACH is increased by a fourth setting value, for example, 1; optionally, the normal random access resource being used may be the random access resource used in the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0417] ⇒ When the random access transmission by the UE uses SBFD random access resources (SBFD RO and / or SBFDpreamble), T_SBFDRACH is increased by a fifth setting value, for example, 1; optionally, the SBFD random access resource being uses may be the random access resource used in the latest (e.g. previous one) transmission that the UE has completed or the random access resource currently selected to be used in the ongoing transmission;

[0418] ⇒ When T_normalRACH=T_normalRACH_max+1, the UE reports a random access error; otherwise, the UE performs a random access resource selection process, such as preparing to start the next random access transmission; where T_normalRACH_max is the configured or predefined maximum number of allowed random access transmissions using normal random access resources; optionally, when T_normalRACH=T_normalRACH_max+1, and T_SBFDRACH is not equal to or less than T_SBFDRACH_max+1, the UE performs a random access resource selection process, but may only select the SBFD random access resource, and when T_SBFDRACH=T_SBFDRACH_max+1 is also satisfied, the UE reports random access error.

[0419] ⇒ When T_SBFDRACH=T_SBFDRACH_max+1, the UE reports a random access error; otherwise, the UE performs a random access resource selection process, such as preparing to start the next random access transmission; where T_SBFDRACH_max is the configured or predefined maximum number of allowed random access transmissions using SBFD random access resources; optionally, when T_SBFDRACH=T_SBFDRACH_max+1 and T_normalRACH is not equal to or less than T_normalRACH_max+1, the UE performs a random access resource selection process, but only normal random access resources may be selected, and when T_normalRACH=T_normalRACH_max+1 is also satisfied, the UE reports a random access error;

[0420] ⇒ T_normalRACH_max may be the same as T_SBFDRACH_max, or have a certain proportional relationship, for example, T_normalRACH_max=X*T_SBFDRACH_max; X is a configured or predefined configuration relationship;

[0421] ⇒ When T_normalRACH+T_SBFDRACH=T_RACH_max+1, the UE reports a random access error; otherwise, the UE performs a random access resource selection process, such as preparing to start the next random access transmission; where T_RACH_max is the configured or predefined maximum number of allowed random access transmissions; optionally, T_RACH_max may reuse the maximum number of allowed random access transmissions in the normal random access configuration;

[0422] ◆ UE uniformly / jointly counts transmissions using normal random access resources and SBFD random access resources, for example, UE uses a counter, a T_RACH counter to record the random access transmissions; the specific operation includes at least one of:

[0423] ⇒ T _ RACH is initially set to 1;

[0424] ⇒ regardless of whether transmission is performed by using normal random access resources or SBFD random access resources, T_RACH is increased by a sixth set value, for example, 1, for example, T _ RACH = T _ RACH+1;

[0425] ⇒ When T_RACH= T_RACH_max+1, the UE reports a random access error; otherwise, the UE performs a random access resource selection process, such as preparing to start the next random access transmission; where T_RACH_max is the configured or predefined maximum number of allowed random access transmissions; exemplary, T_RACH_max is the configured or predefined maximum number of allowed random access transmissions specific to SBFD-support / aware UE; for example, it may be the number obtained by adding and / or obtained by multiplying by a ratio, on basis of the maximum number of times allowed for random access transmission in the normal random access configuration;

[0426] ● Optionally, according to the determined SBFD and / or normal RO set resources, and / or the SSB selected by the UE or designated (for example, the SSB may be replaced by other downlink reference signals, such as CSI-RS, PRS, etc.), the UE selects a RO set and a preamble for transmission; when there are an normal RO and an SBFD RO in the RO set which are adjacent, if the interval between the normal RO and the SBFD RO is less than or not greater than a configured or preset time domain interval value, and / or the preamble formats or subcarrier spacings corresponding to the SBFD RO and the normal RO are different, the UE may perform one of the following operations:

[0427] ■ among these two ROs, it is determined to transmit the normal RO and / or the SBFD RO depending on the UE implementation;

[0428] ■ among these two ROs, UE transmits the normal RO, and UE may transmit or abandon the SBFD RO; this situation is more beneficial when the self-interference experienced on SBFD RO is greater;

[0429] ■ among these two ROs, UE transmits the SBFD RO, and UE may transmit or abandon the normal RO; this situation is more beneficial when higher preamble receiving power and / or power ramping step are configured on SBFD ROs;

[0430]

[0431] ● The RO may be replaced by a valid RO and / or a valid SBFD RO; or a configured RO; wherein

[0432] ■ when the configured RO is invalid, or the valid RO the valid SBFD RO conflicts with other downlink reception or uplink reception, the preamble transmission is cancelled; or the preamble transmission is postpone to the next available valid RO;

[0433] ● Optionally, for a UE that supports or is aware of SBFD (e.g., SBFD-support / aware UE), according to the obtained two-step random access resource and SSB selected by the UE or designated, the UE selects a two-step random access resource (e.g., including resource for msgA PRACH and its mapped msgA PUSCH) for transmission, and in order to perform transmission, the UE needs to determine the power for transmitting msgA, specifically including at least one of:

[0434] ■ When the selected msgA resource is SBFD RACH resource mapping to SBFD PUSCH resource, when the UE determines the initial power Po_nominal,PUSCHof msgA PUSCH, the UE is according to the initial receive power PO_PRE_SBFDof the SBFD preamble and the power offset ΔMsgA_PUSCH_SBFDbetween the SBFD preamble and SBFD PUSCH, the PO_PRE_SBFDand ΔMsgA_PUSCH_SBFDmay reuse the initial receive power PO_PREof the normal preamble and the power offset ΔMsgA_PUSCHbetween the normal preamble and the normal PUSCH;

[0435] ■ When the selected msgA resource is SBFD RACH resource mapped to normal PUSCH resource, when the UE determines the initial power Po_nominal,PUSCHof msgA PUSCH, the UE is according to the initial receive power PO_PRE_SBFDof SBFD preamble and the power offset ΔMsgA_PUSCH_SBFD_normalbetween SBFD preamble and normal PUSCH, wherein, PO_PRE_SBFDand ΔMsgA_PUSCH_SBFD_normalmay reuse PO_PREand ΔMsgA_PUSCH; exemplary, the power offset ΔMsgA_PUSCH_SBFD_normalbetween SBFD preamble and normal PUSCH may be obtained by adding (or subtracting) the power difference ΔPUSCH_SBFD_normalbetween SBFD PUSCH and normal PUSCH based on the power offset ΔMsgA_PUSCH_SBFDbetween SBFD preamble and SBFD PUSCH, for example, ΔMsgA_PUSCH_SBFD_normal=ΔMsgA_PUSCH_SBFD+ΔPUSCH_SBFD_normal; ΔPUSCH_SBFD_normalmay be a value obtained according to configuration or predefined, where it may be a value obtained according to the subcarrier spacing of msgA PRACH or msgA PUSCH;

[0436] ● After transmitting the preamble and / or PUSCH, the UE may detect the response information from other nodes (such as network device), specifically including one or more of:

[0437] ■ the UE uses a first RNTI to detect the response information; the first RNTI includes one of:

[0438] ◆ RA-RNTI, or SBFDRA-RNTI, calculated according to the RO used for transmitting the preamble; exemplary,

[0439] ⇒ when UE uses SBFD RACH resource and / or mapped PUSCH resource (SBFD PUSCH resource or normal PUSCH resource) for transmission, the msgB-RNTI for SBFD two-step random access is calculated according to the second symbol index or the last symbol index on the RO where the preamble is transmitted; or

[0440] ⇒ when UE uses normal RACH resource and / or mapped PUSCH resource (SBFD PUSCH resource or normal PUSCH resource) for transmission, the msgB-RNTI for two-step random access is calculated according to the first symbol index or the last symbol index on the RO where the preamble is transmitted;

[0441] ◆ dedicated RNTI, for example, the UE may receive the dedicated random access resource configuration configured by the network device, in which the dedicated RNTI may be configured for the UE searching the response from the network device;

[0442] ◆ dedicated RNTI for SBFD two-step random access, for example, searching for response from the network device through the dedicated RNTI in the above dedicated random access resource configuration configured by the network device and received by the UE;

[0443] ■ UE searches for the response from network device in the specified control resource set (COREST) and / or search space; the specified control resource set (COREST) and / or search space may be dedicated to SBFD UE (e.g., used by UE supporting SBFD); or dedicated to SBFD random access (for example, used by UE that uses SBFD RO for transmission);

[0444] ■ UE searches for response from network device in the specified control resource set (COREST) for SBFD two-step random access and / or search space for SBFD two-step random access; the specified control resource set (COREST) and / or search space for SBFD two-step random access may be dedicated to the SBFD UE (for example, used by UE supporting SBFD); or dedicated to SBFD two-step random access (for example, used by UE that uses SBFD RO and PUSCH resource for transmission);

[0445] ■ UE searches for response from the network equipment in a specified search window, the specified search window is dedicated to SBFD UE (for example, used by UE supporting SBFD ); or dedicated to SBFD random access (for example, used by UE that uses SBFD RO for transmission); specifically, it includes the time unit start point and / or time unit length of the search window, etc.

[0446] ■ UE searches for response from the network device in a specified search window for SBFD two-step random access, the specified search window is dedicated to SBFD UE (for example, used by UE supporting SBFD); or dedicated to SBFD two-step random access (for example, used by UE that uses SBFD RO and PUSCH resource for transmission); specifically, it includes the time unit start point and / or time unit length of the search window, etc.

[0447] In addition, for a set of symbols occupied by a valid RO and Ngap symbols before the valid RO, the UE does not expect to receive downlink signals (such as PDCCH, PDSCH, CSI-RS, etc.) on part or all of the symbols in the set of symbols; the UE also does not expect the set of symbols to be configured as downlink; except that, for a UE that supports or is aware of SBFD (e.g., SBFD-support / aware UE), part and / or all of symbols in the set of symbols are configured as SBFD symbols or SBFD uplink symbols, or overlap in time domain with SBFD uplink subbands; then, the UE supporting or aware of SBFD can receive downlink signals (e.g., PDCCH, PDSCH, CSI-RS, etc.) on part and / or all of the set of symbols configured as SBFD symbols or overlapped symbols; specifically, the valid RO in the set of symbols is a legacy RO or a non-SBFD RO.

[0448] Referring to FIG. 6, an embodiment of the present disclosure also provides a communication device 600 related to random access, which may be a user equipment (UE) or a network device (e.g., a base station). The communication device includes a transceiver 601, a controller 602, and optionally, a memory (not shown). The transceiver 601 is used to transmit and / or receive signals or data, and computer-executable instructions are stored in the memory. When the instructions executed by the controller 602, at least one method corresponding to the above embodiments of the present disclosure is performed. The above is only an example embodiment of the present invention, and it is not used to limit the present invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

[0449] Those skill in that art will understand that the present invention includes apparatus for perform one or more of the operations described in this application. These devices may be specially designed and manufactured for required purposes, or they may also include known devices in general-purpose computers. These devices have computer programs stored therein, which are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium including but not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), ROM(Read-Only Memory, Read-only memory), RAM(Random Access Memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium in which information is stored or transmitted by a device (e.g., a computer) in a readable form.

[0450] It will be understood by those skilled in the art that each block in these structural diagrams and / or block diagrams and / or flow diagrams and combinations of blocks in these structural diagrams and / or block diagrams and / or flow diagrams may be implemented by computer program instructions. It may be understood by those skilled in the art that these computer program instructions may be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing methods for implementation, so that the scheme specified in the block or blocks of the structure diagram and / or block diagram and / or flow diagram disclosed in the present invention may be executed by the processor of the computer or other programmable data processing methods.

[0451] Those skilled in the art may understand that the steps, measures and schemes in various operations, methods and processes discussed in the present invention may be alternated, modified, combined or deleted. Further, other steps, measures and schemes in the various operations, methods and processes already discussed in the present invention may also be alternated, changed, rearranged, decomposed, combined or deleted. Further, steps, measures and schemes in various operations, methods and flows disclosed in the present invention in the prior art may also be alternated, changed, rearranged, decomposed, combined or deleted.

[0452] What has been described above is only part of the implementation of the present invention. It should be pointed out that for those skilled in the art, several improvements and embellishments may be made without departing from the principles of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.

Claims

1.A method performed by user equipment (UE) in a communication system, comprising:receiving first configuration information related to at least one of an initial preamble target received power and a power ramping step for first random access and second random access, wherein the second random access is related to a second feature;based on the first configuration information, according to whether performed random access is the first random access or the second random access, determining a cumulative power ramping value correspondingly;determining a transmission power for a preamble based on the first configuration information and the cumulative power ramping value;performing random access based on the determined transmission power,wherein, performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,wherein, performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.2.The method of claim 1, wherein the first configuration information includes at least one of:an initial preamble target received power for the first random access;an initial preamble target received power for the second random access;an initial preamble target received power for the first random access and the second random access;a first power ramping step for the first random access;a second power ramping step for the second random access;a third power ramping step for the first random access and the second random access.3.The method of claim 2,wherein the cumulative power ramping value is increased by the first power ramping step or the third power ramping step in case that the performed random access is the first random access, andwherein the cumulative power ramping value is increased by the second power ramping step or the third power ramping step in case that the performed random access is the second random access.4.The method of claim 2, wherein the cumulative power ramping value is determined based on a power ramping step corresponding to the performed random access and a counter related to power ramping.5.The method of claim 4, wherein the counter related to power ramping includes a first counter that counts power ramping for the first random access and a second counter that counts power ramping for the second random access,wherein, the first counter is increased by a first set value in case that the UE performs random access using resource for the first random access and a first condition related to power ramping is satisfied, andwherein, the second counter is increased by a second set value in case that the UE performs random access using resource for the second random access and the first condition related to power ramping is satisfied.6.The method of claim 4, wherein the counter related to power ramping includes a third counter that counts power ramping for the first random access and the second random access together,wherein, the third counter is increased by a third set value in case that the UE performs random access using any one of resource for the first random access and resource for the second random access and a first condition related to power ramping is satisfied.7.The method of claim 2, further comprising:determining a value of a counter related to a number of random access transmissions,reporting a random access error in case that at least one of a fourth counter or a fifth counter reach corresponding maximum values,performing the first random access in case that the fifth counter reaches a fifth maximum value and the fourth counter does not reach a fourth maximum value,performing the second random access in case that the fourth counter reaches the fourth maximum value and the fifth counter does not reach the fifth maximum value,wherein the counter related to a number of random access transmissions includes the fourth counter counting a number of transmissions of the first random access and the fifth counter counting a number of transmissions of the second random access, or the counter related to a number of random access transmissions is a sixth counter counting a number of transmissions of the first random access and the number of transmissions of the second random access together.8.The method of claim 7,wherein the fourth counter is increased by a fourth set value in case that the UE performs random access using the resource for the first random access,wherein the fifth counter is increased by a fifth set value in case that the UE performs random access using the resource for the second random access,wherein the sixth counter is increased by a sixth set value in case that the UE performs random access using any one of the resource for the first random access and the resource for the second random access.9.The method of claim 7, further comprising:reporting a random access error in case that the sixth counter reaches a sixth maximum value,wherein the sixth maximum value is obtained based on the maximum value of the fourth counter.10.A method performed by base station (BS) in a communication system, comprising:transmitting to a user equipment (UE) first configuration information related to at least one of an initial preamble target received power and a power ramping step for first random access and second random access, wherein the second random access is related to a second feature;receiving a random access transmission from UE;wherein, a cumulative power ramping value is based on the first configuration information, according to whether performed random access is the first random access or the second random access;wherein a transmission power for a preamble is based on the first configuration information and the cumulative power ramping value;wherein,the random access transmission is based on the transmission power;wherein performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,wherein, performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.11.The method of claim 10, wherein the first configuration information includes at least one of:an initial preamble target received power for the first random access;an initial preamble target received power for the second random access;an initial preamble target received power for the first random access and the second random access;a first power ramping step for the first random access;a second power ramping step for the second random access;a third power ramping step for the first random access and the second random access.12.The method of claim 11, wherein the cumulative power ramping value is based on a power ramping step corresponding to the performed random access and a counter related to power ramping.13.The method of claim 11, further comprising:receiving a random access error in case that at least one of a fourth counter or a fifth counter reach corresponding maximum values,wherein the first random access is performed in case that the fifth counter reaches a fifth maximum value and the fourth counter does not reach a fourth maximum value,wherein the second random access is performed in case that the fourth counter reaches the fourth maximum value and the fifth counter does not reach the fifth maximum value,wherein a counter related to a number of random access transmissions includes the fourth counter counting a number of transmissions of the first random access and the fifth counter counting a number of transmissions of the second random access, or the counter related to a number of random access transmissions is a sixth counter counting a number of transmissions of the first random access and the number of transmissions of the second random access together.14.A user equipment (UE) in a communication system, comprising:a transceiver configured to transmit or receive signals;a controller configured to:receive first configuration information related to at least one of an initial preamble target received power and a power ramping step for first random access and second random access, wherein the second random access is related to a second feature;based on the first configuration information, according to whether performed random access is the first random access or the second random access, determine a cumulative power ramping value correspondingly;determine a transmission power for a preamble based on the first configuration information and the cumulative power ramping value;perform random access based on the determined transmission power,wherein performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,wherein performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.15.A base station (BS) in a communication system, comprising:a transceiver configured to transmit or receive signals;a controller configured to:transmit to a user equipment (UE) first configuration information related to at least one of an initial preamble target received power and a power ramping step for first random access and second random access, wherein the second random access is related to a second feature;receive a random access transmission from UE;wherein, a cumulative power ramping value is determined based on the first configuration information, according to whether performed random access is the first random access or the second random access;wherein a transmission power for a preamble is based on the first configuration information and the cumulative power ramping value;wherein the random access transmission is based on the transmission power;wherein performed random access being the first random access includes: resource for the first random access is used in last random access transmission or current random access transmission,wherein, performed random access being the second random access includes: resource for the second random access is used in last random access transmission or current random access transmission.

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