CN112437495A

CN112437495A - Transmission method and equipment for random access

Info

Publication number: CN112437495A
Application number: CN202010255532.5A
Authority: CN
Inventors: 熊琦; 王轶; 孙霏菲; 喻斌
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2019-04-30
Filing date: 2020-04-02
Publication date: 2021-03-02

Abstract

The embodiment of the application provides a transmission method and equipment for random access, wherein the transmission method for random access comprises the following steps: acquiring resource configuration information of an uplink signal; obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal; and determining resources for two-step random access transmission according to the resource configuration information of the two-step random access, and performing the two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending data of the two-step random access on a Physical Uplink Shared Channel (PUSCH). The application realizes the transmission of two-step random access.

Description

Transmission method and equipment for random access

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a transmission method and device for random access.

Background

Transmissions in a wireless communication system include: the transmission from the base station (gNB) to the User Equipment (UE) (referred to as downlink transmission) is referred to as downlink timeslot, the transmission from the UE to the base station (referred to as uplink transmission) is referred to as uplink timeslot.

In downlink communication in a wireless communication system, the system periodically transmits a synchronization signal and a broadcast channel to a user through a Synchronization Signal Block (SSB), which is an SSB period (SSB period) or referred to as an SSB burst period. Meanwhile, the base station configures a random access configuration period (PRACH configuration period), configures a certain number of random access transmission opportunities (also called random access opportunities, ROs) in the period, and satisfies that all SSBs can be mapped to corresponding ROs in a mapping period (certain time length).

In a New Radio (NR) communication system, the performance of random access directly affects the user experience before the establishment of Radio resource control, for example, during random access. In conventional wireless communication systems, such as LTE and LTE-Advanced, a Random Access procedure is applied to multiple scenarios, such as establishing an initial link, performing cell handover, re-establishing an uplink, and re-establishing an RRC connection, and is divided into Contention-based Random Access (Contention-based Random Access) and non-Contention-based Random Access (Contention-free Random Access) according to whether a user has exclusive use of a preamble sequence resource. In contention-based random access, in the process of trying to establish uplink, each user selects a preamble sequence from the same preamble sequence resource, and it may happen that a plurality of users select the same preamble sequence to send to a base station, so a collision resolution mechanism is an important research direction in random access, how to reduce collision probability and how to quickly resolve an occurred collision, and is a key index affecting random access performance.

In LTE-a, the contention-based random access procedure is divided into four steps, as shown in fig. 1, in the first step, a user randomly selects a preamble sequence from a preamble sequence resource pool and sends the preamble sequence to a base station. The base station carries out correlation detection on the received signal so as to identify a leader sequence sent by a user; in the second step, the base station sends a Random Access Response (RAR) to the user, wherein the RAR includes a Random Access preamble sequence Identifier, a timing advance command determined according to the time delay estimation between the user and the base station, a Temporary Cell Radio Network Temporary Identifier (C-RNTI), and a time-frequency resource allocated for the next uplink transmission of the user; in the third step, the user sends a third message (Msg3) to the base station according to the information in the RAR. The Msg3 includes information such as a user terminal identifier and an RRC connection request, wherein the user terminal identifier is unique for a user and is used for resolving a conflict; in the fourth step, the base station sends conflict resolution identification to the user, including the identification of the user terminal that wins the conflict resolution. And after detecting the own identity, the user upgrades the temporary C-RNTI into the C-RNTI and sends an ACK signal to the base station to finish the random access process and wait for the scheduling of the base station. Otherwise, the user will start a new random access procedure after a delay.

For a non-contention based random access procedure, since the base station knows the user identity, the user may be assigned a preamble sequence. Therefore, when the user sends the preamble sequence, the user does not need to randomly select the sequence, and the allocated preamble sequence is used. After detecting the allocated preamble sequence, the base station sends a corresponding random access response, including information such as timing advance and uplink resource allocation. And after receiving the random access response, the user considers that the uplink synchronization is finished and waits for the further scheduling of the base station. Therefore, the non-contention based random access procedure only comprises two steps: step one is to send a leader sequence; and step two, sending the random access response.

The random access procedure in LTE is applicable to the following scenarios:

initial access under RRC IDLE.

2. The RRC connection is re-established.

3. And (4) switching the cells.

And 4, downlink data arrives and a random access process is requested in the RRC connection state (when the uplink is in non-synchronization).

And 5, uplink data arrives and requests a random access process in the RRC connection state (when the uplink is in asynchronous or the PUCCH resource, no resource is allocated to the scheduling request).

6. And (6) positioning.

To meet the huge traffic demand, the 5G communication system is expected to operate on high band resources from low band up to around 100G, including licensed and unlicensed bands. The unlicensed frequency band mainly considers a 5GHz frequency band and a 60GHz frequency band. We refer to the 5G system operating in the unlicensed frequency band as an NR-U system, which may include a scenario of independently operating in the unlicensed frequency band, a scenario of operating in a Dual Connectivity (DC) manner with the licensed frequency band, and a scenario of operating in a Carrier Aggregation (CA) manner with the licensed frequency band. In the 5GHz band, 802.11 series Wireless Fidelity (WiFi) systems, radar, and LTE Licensed-Assisted Access (LAA) systems have been deployed, which all follow a Listen Before Talk (LBT) mechanism, i.e., a Wireless channel must be detected before transmitting a signal, and the Wireless channel can be occupied to transmit the signal only when the Wireless channel is detected to be idle. In the 60GHz band, 802.11ay systems already exist, and therefore LBT mechanisms are also followed. In other unlicensed frequency bands, an effective coexistence mode needs to be established according to corresponding specifications.

The LBT mechanism can be divided into two categories. One type, known as the first type of LBT, known as Category4LBT (TS 36.21315.2.1.1), determines the Collision Window Size (CWS), and randomly generates a backoff factor X. A signal may be transmitted if X carrier monitoring slots (CCA slots) are all idle. The first type of LBT is divided into four LBT priority classes (LBT priority classes) which respectively correspond to different qcis (quality criterion indicators). Different LBT priority classes, CWS are different in size (i.e. CW values are different in sets), backoff time units (defer period, which is equal to 16+9 × n microseconds, n is an integer greater than or equal to 1) are different, and Maximum Channel Occupancy Time (MCOT) is also different. Another type is referred to as LBT of the second type (TS 36.21315.2.1.2), the sender only needs to perform CCA (Clear Channel Assessment) detection for 25us before the start of the standard defined transmission signal, and can transmit the signal if the Channel is Clear.

In some communication systems (licensed and/or unlicensed spectrum), to enable faster transmission and reception of signals, it is considered to transmit a random access preamble along with a data portion (denoted as message a) and then search for feedback from network devices in the downlink channel (denoted as message B). However, how to configure the resources for transmitting the random access preamble and the data portion of the message a to enable the base station to better detect the message a transmitted by the user is a problem to be solved, and how to accurately determine an effective random access opportunity in the unlicensed spectrum is also a problem to be solved.

Disclosure of Invention

The application provides a random access transmission method and equipment aiming at the defects of the existing mode, and is used for solving the problem of how to realize two-step random access transmission.

In a first aspect, a transmission method for random access is provided, and is applied to a user equipment UE, and includes:

acquiring resource configuration information of an uplink signal;

obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal;

and according to the resource configuration information of the two-step random access, performing two-step random access transmission and determining resources for the two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending data of the two-step random access on a Physical Uplink Shared Channel (PUSCH).

In a second aspect, a transmission method for random access is provided, and is applied to a UE, and includes:

acquiring resource configuration information of random access of an unlicensed spectrum;

determining one or more effective random access opportunities (RO) for random access of the unlicensed spectrum according to the resource configuration information of the random access of the unlicensed spectrum;

and selecting one effective random access opportunity in the one or more effective random access opportunities to perform random access transmission, wherein the random access transmission comprises sending a preamble on the random access opportunity.

In a third aspect, a UE is provided, including:

the first processing module is used for acquiring resource configuration information of an uplink signal;

the second processing module is used for obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal;

and the third processing module is used for determining resources used for the two-step random access transmission according to the resource configuration information of the two-step random access, and performing the two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending data of the two-step random access on a Physical Uplink Shared Channel (PUSCH).

In a fourth aspect, a UE is provided, including:

the fourth processing module is used for obtaining resource configuration information of random access of the unlicensed spectrum;

a fifth processing module, configured to determine, according to resource configuration information of random access of an unlicensed spectrum, one or more effective random access opportunities (ROs) for random access of the unlicensed spectrum;

a sixth processing module, configured to select an effective random access opportunity from the one or more effective random access opportunities, and perform random access transmission, where the random access transmission includes sending a preamble on the random access opportunity.

In a fifth aspect, a UE is provided, including: a processor; and

a memory configured to store machine readable instructions which, when executed by the processor, cause the processor to perform the method of transmission of random access in the first aspect.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

acquiring resource configuration information of an uplink signal; obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal; and determining resources for two-step random access transmission according to the resource configuration information of the two-step random access, and performing two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending two-step random access data on a Physical Uplink Shared Channel (PUSCH), so that the two-step random access transmission is realized.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.

Fig. 1 is a schematic diagram of a contention-based random access procedure provided in an embodiment of the present application;

fig. 2 is a flowchart illustrating a transmission method of random access according to an embodiment of the present application;

fig. 3 is a schematic diagram for determining whether a PUSCH time-frequency resource unit and an RO are in the same time slot according to an embodiment of the present application;

fig. 4 is a flowchart illustrating another transmission method for random access according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a usage determination criterion 4 provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of a usage judgment criterion 5.1 provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of a usage judgment criterion 5.2 provided by an embodiment of the present application;

fig. 8 is a schematic structural diagram of a UE according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another UE provided in the embodiment of the present application;

fig. 10 is a schematic structural diagram of another UE provided in the embodiment of the present application;

FIG. 11 is a first schematic diagram illustrating a usage determination criterion 6 according to an embodiment of the present application;

FIG. 12 is a second schematic diagram of a usage determination criterion 6 according to an embodiment of the present application;

fig. 13 is a schematic diagram of determining the LBT class and/or priority of an RO according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Example one

The embodiment of the present application provides a transmission method for random access, which is applied to a UE, and a flowchart of the method is shown in fig. 2, where the method includes:

step S101, acquiring resource configuration information of the uplink signal.

And step S102, obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal.

Step S103, according to the resource configuration information of the two-step random access, determining resources used for the two-step random access transmission, and performing the two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending two-step random access data on a Physical Uplink Shared Channel (PUSCH).

In the embodiment of the application, resource configuration information of an uplink signal is obtained; obtaining resource configuration information of two-step random access according to the resource configuration information of the uplink signal; and determining resources for two-step random access transmission according to the resource configuration information of the two-step random access, and performing two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending two-step random access data on a Physical Uplink Shared Channel (PUSCH), so that the two-step random access transmission is realized.

Optionally, the method for obtaining the resource configuration information of the uplink signal includes at least one of the following:

acquiring resource configuration information of an uplink signal from random access feedback in a random access process;

acquiring resource configuration information of an uplink signal from downlink control information for scheduling uplink transmission;

acquiring resource configuration information of an uplink signal from a system message sent by a network side or a Radio Resource Control (RRC) configuration message acquired by UE;

and acquiring resource configuration information of the uplink signal from the pre-configured parameter information.

Optionally, the resource configuration information of the uplink signal includes at least one of:

fourthly, randomly accessing configuration information;

random access resource configuration information of the two-step random access;

downlink beam configuration information;

and data resource configuration information of two-step random access.

Optionally, the data resource configuration information of the two-step random access includes at least one of time-frequency resource configuration information of a PUSCH and uplink demodulation reference signal DMRS configuration information;

the time-frequency resource configuration information of the PUSCH comprises a time range where the selected RO is located, and the time range comprises:

and selecting the random access time slot where the two-step random access time frequency resources are located or the last RO in the time domain of the random access time slot where the two-step random access time frequency resources are located.

Optionally, obtaining first mapping information from the downlink beam to the RO according to the resource configuration information of the uplink signal, where the first mapping information includes at least one of a mapping period from the synchronization signal block SSB to the RO and a mapping pattern period from the SSB to the RO;

and obtaining second mapping information from the CSI-RS to the RO according to the resource configuration information of the uplink signal, wherein the second mapping information comprises at least one of a CSI-RS to RO mapping period and a CSI-RS to RO mapping pattern period.

Optionally, obtaining resource allocation of two-step random access according to the resource allocation information of the uplink signal includes:

determining one or more ROs and one or more preambles of the two-step random access according to the resource configuration information, the first mapping information and the second mapping information of the uplink signal;

selecting one or more RO and one of one or more preamble, and determining available PUSCH resources, wherein the available PUSCH resources comprise PUSCH time-frequency resources and/or DMRS port resources.

Optionally, determining available PUSCH resources according to the selected RO includes:

when the UE obtains configured PUSCH resources for two-step random access, and when one or more configured PUSCH time-frequency resource units are in the same time slot as the selected RO, and/or only when the frequency domain position of one PUSCH time-frequency resource unit is in the frequency domain range of the selected RO, and/or the SCS of one PUSCH time-frequency resource unit is the same as the SCS of the selected RO and/or the SCS of the uplink frequency band part UL BWP, the PUSCH time-frequency resource unit is available;

or, when the UE obtains configured PUSCH resources for two-step random access, and when one or more configured PUSCH time-frequency resource units are in the same time slot as other ROs in the time range of the selected RO, and/or when the frequency domain location of one PUSCH time-frequency resource unit is in the frequency domain range of the other ROs in the time range of the selected RO, and/or the SCS of one PUSCH time-frequency resource unit is the same as the SCS of the selected RO and/or the SCS of UL BWP, the PUSCH time-frequency resource unit is available.

when the UE obtains configured PUSCH resources for two-step random access and one or more configured PUSCH time-frequency resource units and the selected RO are in different time slots, the UE can select the PUSCH time-frequency resource units and the selected RO to send data of the two-step random access on the PUSCH time-frequency resource units in the same time slot;

or, when the UE obtains configured PUSCH resources for two-step random access, and when one or more configured PUSCH time-frequency resource units and other ROs in a time range of the selected RO are in different time slots, the UE may select another RO in the same time slot as the selected RO to transmit data for two-step random access on the PUSCH time-frequency resource unit.

Optionally, the length of the time slot is determined by a specific subcarrier spacing, and includes at least one of:

determined by a subcarrier spacing, SCS, of the upstream BWP, wherein the SCS of the upstream BWP comprises at least one of: SCS of the uplink BWP is initially activated, SCS of the common uplink activation BWP and SCS of the default uplink activation BWP;

determined by the SCS of the random access preamble;

determined by the minimum of the SCS of the random access preamble and the SCS of the uplink BWP.

Optionally, after the UE sends the preamble and the data of the two-step random access on the PUSCH, the UE searches for the two-step random access feedback information in the control information search space configured by the network, and when the feedback information includes the unmatched collision resolution identifier, the UE performs a random access retry.

Optionally, the UE is to perform a random access retry, including at least one of:

the UE retries four-step random access, and the former random access is two-step random access or four-step random access;

the UE retries two-step random access, and the former random access is two steps; the UE retries two-step random access, and the previous time is two-step random access, including any of the following:

the method comprises the steps that a preamble sent by two steps of random access is the same as a preamble sending beam sent by two steps of random access, and/or a selected downlink beam is not changed, and/or a PUSCH sent by two steps of random access is the same as a PUSCH sending beam sent by two steps of random access, and the UE adds a preset value to a preamble power climbing counter;

when the transmission beam of the lead code of the two-step random access is different from the transmission beam of the lead code of the two-step random access, and/or the selected downlink beam is changed, and/or the transmission beam of the PUSCH of the two-step random access is different from the transmission beam of the PUSCH of the two-step random access, the UE transmission power climbing and suspending indication is sent to a high layer, and the lead code power climbing counter is unchanged;

the UE retries two-step random access, and the former random access is four-step random access; the UE retries two-step random access, and the previous random access is four-step random access, which includes any one of the following:

when the wave beam of the lead code sent by the two-step random access is the same as that of the lead code sent by the four-step random access, and/or the selected downlink wave beam is not changed, the UE adds a preset value to a lead code power climbing counter;

and when the wave beam for sending the lead code of the two-step random access is different from the wave beam for sending the lead code of the four-step random access, and/or the selected downlink wave beam is changed, the UE sends a power climbing pause instruction to a higher layer and the wave beam power climbing counter is not changed.

Optionally, the UE may obtain resource configuration information of the uplink signal from at least one of:

1. in a random access feedback (RAR) of a random access procedure, for example, in uplink scheduling (UL grant) information therein;

2. downlink control information for scheduling uplink transmission, for example, uplink scheduling (UL grant) information therein or a single DCI configuration; wherein the scheduled uplink transmission may be a new transmission of data or a retransmission of data;

3. and upper layer control signaling such as a system message sent by a network side or an RRC configuration message obtained by the UE.

4. Pre-configured parameter information;

wherein, the resource configuration information of the uplink signal at least comprises one of the following items:

1. the four-step random access configuration information (i.e. the conventional random access configuration information) includes at least one of the following:

■ four steps random access configuration period, P _4 STEPRACH;

■ four-step random access opportunity time unit index (such as slot index, symbol index, subframe index, etc.);

■ frequency domain unit index of random access opportunity (such as carrier index, BWP index, PRB index, subcarrier index, etc.);

■ random access opportunity number;

■ four-step random access preamble format (such as cyclic prefix CP length, preamble sequence length and repetition number, length of guard interval GT, and used subcarrier interval size);

■ random accessing the lead code number, root sequence index and cyclic shift value;

■ number of SSBs that can be mapped on a four-step random access opportunity (4STEPRO, 4step rach occasion);

■ one or more CSI-RS indices for four-step random access;

■ number of 4STEPRO mapped by one CSI-RS;

■ one or more 4STEPRO indices of a CSI-RS map;

2. the random access resource configuration information of the two-step random access comprises at least one of the following items:

■ two-step random access configuration period, P _2 STEPRACH;

■ two-step random access opportunity time unit index (such as slot index, symbol index, subframe index, etc.);

■ two-step random access opportunity frequency domain unit index (such as carrier index, BWP index, PRB index, subcarrier index, etc.);

■ number of two-step random access opportunities, this number may be specifically indicated as the number of preambles of set a, e.g. number of ra-preambles for2 steppragorupa preambles inter (1..64) where the UE selects a preamble from set a when the size of data in the user 'S message a is smaller (not larger) than a preset or configured threshold S1, and/or the user' S measured downlink PL (and/or RSRP) is smaller (not larger) than a preset or configured threshold S2; when the data size in the message a of the user is not less than (greater than) a preset or configured threshold value S1, and/or the downlink PL (and/or RSRP) measured by the user is not less than (greater than) a preset or configured threshold value S2, the UE selects a preamble from the set B; at the moment, the number of the lead codes in the set B is reduced by the number of all available lead codes minus the number of the available lead codes in the set A; and the lead code starting position of the set B can be formed by adding the starting position of the set A with the number of the available lead codes of the set A; specifically, the set a is used to map the PUSCH resource configuration of one message a, and the set B is used to map the PUSCH resource configuration of another message a, where the PUSCH resource configuration of the message a includes at least one of a Modulation and Coding Scheme (MCS), a transport block size (transmit block size TBS), a PUSCH time-frequency resource size, a DMRS resource size or configuration in the PUSCH, for example, the data bit size transmitted on the PUSCH of the preamble mapping in the set a is TBS1 ═ 72bit, and the data bit size transmitted on the PUSCH of the preamble mapping in the set a is TBS1 ═ 1000 bit. In particular, the network configuration information may directly indicate that the N four-step random access preambles are two-step random access preambles, which may be predefined as N that are the smallest (large) preamble index values in the four-step random access (all, or set a, or set B); optionally, when there is only one PUSCH configuration in one BWP, set a (or both set a and set B) is mapped (indicated) to the PUSCH configuration; when a BWP has two PUSCH configurations, the UE expects the base station to configure set a and set B, and/or set a maps to a PUSCH configuration with a lower indicated MCS (e.g., lower coding rate and/or lower modulation order) and/or a lower allowed TBS by default, and correspondingly, set B maps to a PUSCH configuration with a higher indicated MCS (e.g., higher coding rate and/or higher modulation order) and/or a higher allowed TBS; or vice versa, i.e. set B maps by default to the PUSCH configuration with a lower indicated MCS (e.g. lower coding rate and/or lower modulation order) and/or a lower allowed TBS, and correspondingly set a maps to the PUSCH configuration with a higher indicated MCS (e.g. higher coding rate and/or higher modulation order) and/or a higher allowed TBS; optionally, whether set B is configured is used to inform the UE whether two PUSCH configurations are configured in BWP, i.e. if the base station configures set B for the two-step random access preamble of the BWP, the UE expects (or determines) that the base station configured two PUSCH configurations on the BWP;

■ two-step random access preamble format (such as cyclic prefix CP length, preamble sequence length and repetition number, length of guard interval GT, size of used subcarrier interval, etc.);

■ random access of the two steps of the number of the lead codes, the index of the root sequence and the cyclic shift value;

■ the number of SSBs that can be mapped on a two-step random access opportunity (2STEPRO, 2step rach occasion);

■ one or more CSI-RS indices for two-step random access;

■ number of 2STEPRO mapped by one CSI-RS;

■ one or more 2STEPRO indices of a CSI-RS map;

■ especially, if the parameters in the two-step random access configuration information are not configured separately, the UE may determine the relative relationship between the UE and the corresponding parameters in the four-step random access configuration information, for example, the four-step random access configuration period and a predefined or configured extended parameter are calculated to obtain a two-step random access configuration period;

3. downlink beam (e.g., SSB and/or CSI-RS) configuration information; including at least one of:

■ downlink beam period size;

■ the number of downlink beams transmitted in one downlink beam period;

■ index of downlink beam transmitted in one downlink beam period;

■ time cell location of transmitted downlink beam within one downlink beam period;

■ frequency domain unit location of downlink beam transmitted in one downlink beam period;

4. the two-step random access data resource configuration information, namely the resource configuration information of the Physical Uplink Shared Channel (PUSCH), wherein a PUSCH resource unit (composed of a PUSCH time-frequency resource unit and a DMRS port resource) comprises at least one of the following items:

■ time-frequency resource configuration information of PUSCH, including at least one of:

one or more PUSCH time-frequency resource units (i.e., a PUSCH time-frequency resource corresponding to one two-step random access preamble includes M time units and N frequency units, and if there are multiple PUSCH time-frequency resource units, the sizes of different PUSCH time-frequency resource units may be different, that is, the values of M and/or N may be different due to different PUSCH time-frequency resource units), and table lookup may be performed;

time-frequency resource configuration period of PUSCH, P _ PUSCH;

time unit indexes (such as slot indexes, symbol indexes, subframe indexes and the like) of PUSCH time-frequency resource units;

frequency domain unit indexes (such as carrier index, BWP index, PRB index, subcarrier index, etc.) of PUSCH time-frequency resource units;

time domain starting position of time frequency resource of PUSCH; the time domain starting position can be a time domain interval between a PUSCH time frequency resource configured by the network equipment and a corresponding two-step random access time frequency resource, namely N time units; and/or the time length occupied by the PUSCH time-frequency resources configured by the network device, i.e. M1 time units or M1 resource units for two-step random access PUSCH (the time-frequency resource size for transmitting a data part of a specific size is composed of predefined X time units and Y frequency domain units); the UE uses the first time unit after the last time unit in the time range of the two-step random access time-frequency resource selected by the UE is N (or N + X _ id × M1; or N + X _ id × M1 × or N + X _ id × M1+ delta; or N + X _ id × M1 × X + delta) time units as the time domain starting point of the PUSCH two-step time-frequency resource corresponding to the two-step random access time-frequency resource selected by the UE. Where x _ id may be the index t _ id in the time domain of the selected RO, or the RO index, where delta is a predefined or configured additional time unit interval. Wherein, the time range of the selected two-step random access time frequency resources may be at least one of:

i. directly the selected two-step random access time-frequency resource (i.e. the selected RO);

selecting a random access time slot (slot) where the two-step random access time frequency resources are located or a last RO on a time domain;

iii, selecting the random access configuration cycle where the two-step random access time frequency resources are located or the last RO in the time domain;

selecting a complete mapping (mapping circle) from a downlink beam where the two-step random access time-frequency resources are located to the random access resources or a last RO in a time domain;

v. selecting a mapping period (association period) from a downlink wave beam where the two-step random access time-frequency resource is located to the random access resource or a last RO in a time domain;

and vi, selecting a mapping pattern period (association pattern period) from the downlink beam where the two-step random access time-frequency resources are located to the random access resource or the last RO in the time domain.

The frequency domain starting position of the time-frequency resource of the PUSCH; predefining or configuring a frequency domain starting position, such as a frequency domain starting position of a two-step random access PUSCH and/or M2 frequency domain units (or resource units of a two-step random access PUSCH) after N frequency domain units from one frequency domain position; wherein, one frequency domain position may be:

i. a band part (bandwidth part, bwp); carrier waves, etc.;

the frequency domain starting position of the selected two-step random access RO;

the UE determines that the frequency domain starting point position determination manner of the two-step random access PUSCH corresponding to the selected RO may be the first frequency domain unit after N (or N + x _ id × M2; or N + x _ id × M2 × Y; or N + x _ id × M2+ delta; N + x _ id × M2 × Y + delta) frequency domain units; wherein x _ id is the frequency domain index of the selected RO, or the RO index; or a selected preamble index (preamble index over the entire RO or preamble index available for two-step random access, e.g., preamble index over the entire RO is 0-63, and preamble available for two-step random access is 54-63, where x _ id can be 0-9); particular N may be 0; wherein, delta can be expressed as protection carrier, which avoids interference between carriers as much as possible;

specifically, the indicated time domain starting position of the time frequency resource of the PUSCH is the position of the first PUSCH time frequency resource unit, and/or the indicated frequency domain starting position of the time frequency resource of the PUSCH is the position of the first PUSCH time frequency resource unit, and the other time frequency resources corresponding to all the two-step random access time frequency resources within the time range of the two-step random access time frequency resource selected by the UE are sequentially derived in a frequency domain-first time domain-second time domain or a time domain-first frequency domain-second frequency domain manner;

PUSCH time-frequency resource unit number (or PUSCH time-frequency resource unit number in time domain and/or PUSCH time-frequency resource unit number in frequency domain are respectively configured);

PUSCH time-frequency resource element format (such as repetition times, guard interval GT length, guard frequency domain interval GP, etc.);

the number of downlink beams which can be mapped on one PUSCH time frequency resource unit;

one or more downlink beam indexes for two-step random access PUSCH transmission;

the number of PUSCH time-frequency resource units mapped by one downlink wave beam;

one or more PUSCH time-frequency resource element indexes mapped by one downlink wave beam;

■, configuring information of DMRS of uplink demodulation reference signals; including at least one of:

the number N _ DMRS and/or index of DMRS ports available on one PUSCH time-frequency resource element (i.e., each DMRS port corresponds to its own port configuration information) and/or DMRS sequence index (e.g., may be scrambling ID, etc.);

DMRS port configuration information, including at least one of:

i. sequence type, such as indicating whether it is a ZC sequence, gold sequence, etc.;

cyclic shift interval, cyclic shift;

length (i.e., the subcarriers occupied by DMRS sequences), sequence length;

time domain orthogonal cover code, TD-OCC, for example a TD-OCC of length 2 may be: [ +1, -1], [ -1, +1 ];

v. frequency domain orthogonal cover code, FD-OCC, for example FD-OCC of length 2 may be: [ +1, -1], [ -1, +1 ];

comb configuration, including comb size and/or comb offset, e.g. comb size 4, offset 0, indicating 0 th RE of every 4 REs of DMRS sequence, if offset 1, indicating 1 st RE of every 4 REs of DMRS sequence.

Initial scrambling sequence index.

Optionally, the UE may obtain mapping information (first mapping information) of a downlink beam (taking SSB as an example) to an RO (including a four-step random access RO and/or a two-step random access RO) based on the configuration information of the uplink signal, where the mapping information includes at least one of the following items:

● SSB to RO mapping period (such as the number of random access configuration period needed to complete at least one SSB to RO mapping);

● SSB to RO mapping pattern period (e.g. ensuring SSB to RO mapping in two adjacent mapping pattern periods is identical time length, such as required number of SSB to RO mapping periods, or required number of random access configuration periods).

Optionally, the UE may obtain mapping information (second mapping information) of the CSI-RS to the RO based on the configuration information, where the mapping information includes at least one of the following items:

● mapping period of CSI-RS to RO (such as the number of random access configuration periods needed to complete mapping of all CSI-RS to RO in at least one CSI-RS period).

● mapping pattern periods of CSI-RS to RO (e.g. ensuring that the mapping of CSI-RS to RO in two adjacent mapping pattern periods is exactly the same time length, such as the required number of mapping periods of CSI-RS to RO, or the required number of random access configuration periods).

Optionally, according to the configuration information and the mapping relationship setting of the received uplink signal, the UE may randomly access the RO and the preamble through the determined (selected) two steps, and then find available PUSCH resources (PUSCH time-frequency resources and DMRS ports) through the mapping relationship, and if N >1 PUSCH resources are found, the UE selects one PUSCH resource from the equal probability to perform corresponding PUSCH transmission. Wherein, in particular, when the UE obtains configured PUSCH resources for two-step random access:

1. when one or more configured PUSCH time-frequency resource units and the selected RO (or other ROs in the time range of the selected RO) are in the same time unit (hereinafter, taking a time slot as an example, and in one time slot), the length of the time slot is determined by a specific subcarrier spacing (the length of the time slot is inversely proportional to the subcarrier spacing, that is, the larger the subcarrier spacing is, the length of the corresponding time slot is about short, for example, the length of the time slot corresponding to SCS 15khz is 2 times the length of the time slot corresponding to SCS 30 khz), and the PUSCH time-frequency resource unit is considered as unavailable by the user equipment. That is, the UE does not select to send the data part of the two-step random access on the PUSCH time-frequency resource unit in the same time slot as the selected RO (or other ROs within the time range of the selected RO). Specifically, when one or more configured PUSCH time-frequency resource units are in the same time slot as the selected RO (or other ROs in the time range of the selected RO), one PUSCH time-frequency resource unit is available only when the frequency domain location of the PUSCH time-frequency resource unit is in the frequency domain range of the selected RO (or other ROs in the time range of the selected RO), and/or the SCS of the one PUSCH time-frequency resource unit is the same as the SCS of the selected RO and/or the SCS of the UL BWP.

2. When the configured PUSCH time-frequency resource unit(s) and the selected RO (or other ROs within the time range of the selected RO) are in different time units (in the following, taking a time slot as an example, and within one time slot), the user equipment considers the PUSCH time-frequency resource unit to be available. That is, the UE may select to send the data part of the two-step random access on the PUSCH time-frequency resource unit in the same time slot as the selected RO (or other ROs within the time range of the selected RO).

Wherein the length of the time slot is determined by a specific subcarrier spacing and can be at least one of the following:

1. the uplink BWP (which may be an initial active uplink BWP, a normal uplink active BWP, or a default uplink active BWP) is determined by the SCS, that is, the slot length is the uplink BWP slot length;

2. the time slot length is determined by SCS of the random access preamble code, namely the time slot length is RACH time slot length;

3. the length of the time slot is determined by the minimum value of the SCS of the random access preamble and the SCS of the uplink BWP, namely the length of the time slot is the longest length of the uplink BWP time slot and the RACH time slot; as shown in fig. 3, the SCS of the random access preamble is minimum at this time, i.e. determined according to the RACH slot.

Optionally, after the UE sends the preamble and PUSCH (i.e., message a), the UE searches for possible two-step random access feedback within the control information search space configured by the network.

●, if the feedback information contains the matched conflict resolution identification, it indicates that the preamble and PUSCH of the UE are correctly detected and decoded by the base station.

●, if no matched feedback information is detected or the feedback information contains unmatched conflict resolution identification, it indicates that the preamble and PUSCH of the UE are not correctly detected and decoded by the base station, and the UE needs to perform random access retry (re-attach).

■ if the UE retries four-step random access, and the previous 2-step random access or 4-step random access.

If the PREAMBLE transmitted by the four-step random access is the same as the PREAMBLE transmission beam transmitted by the previous 2-step or 4-step random access, and/or the selected downlink beam is not changed, the UE may ramp up the PREAMBLE POWER by a COUNTER (PREAMBLE _ POWER _ RAMPING _ COUNTER) + 1; it should be noted that the preset value added by the preamble power ramp counter is 1;

if the PREAMBLE transmitted for the four-step random access is not the same as the PREAMBLE transmission beam transmitted for the previous 2-step or 4-step random access, and/or the selected downlink beam is changed, the UE transmission POWER RAMPING suspension (POWER RAMPING suspension) is indicated to the higher layer and PREAMBLE _ POWER _ RAMPING _ COUNTER is not changed.

Optionally, regardless of whether the PREAMBLE transmitted by the UE for the four-step random access is the same as the PREAMBLE transmission beam previously transmitted for the 2-step or 4-step random access, and/or whether the selected downlink beam is changed, the UE increments the PREAMBLE POWER ramp COUNTER (PREAMBLE _ POWER _ RAMPING _ COUNTER) + 1; it should be noted that the preset value added by the preamble power ramp counter is 1; and/or the UE sends a preamble transmission counter +1, where it needs to be noted that the preset value added by the preamble transmission counter is 1; the UE is convenient to continue counting, and the two-step random access and the 4-step random access are regarded as the sum of the random access; when the UE is switched to the four-step random access, the power compensation can be continuously obtained due to the previous random access failure;

optionally, the UE resets (to 0) the PREAMBLE POWER ramp-up COUNTER (PREAMBLE _ POWER _ RAMPING _ COUNTER) regardless of whether the PREAMBLE transmitted by the UE for the four-step random access is the same as the PREAMBLE transmission beam previously transmitted for the 2-step or 4-step random access, and/or whether the selected downlink beam is changed; and/or the UE resets (to 0) the preamble transmission counter; the UE can distinguish two-step random access from 4-step random access conveniently; the method avoids the overlarge interference to the original random access user when the UE is switched to the four-step random access;

optionally, regardless of whether the PREAMBLE transmitted by the UE for the four-step random access is the same as the PREAMBLE transmission beam transmitted by the previous 2-step or 4-step random access, and/or whether the selected downlink beam is changed, when the downlink beam RSRP (or RSRQ) measured by the UE is greater than (or not less than) a (preset or configured by the base station) threshold value, the UE resets (to 0) the PREAMBLE POWER ramp-up COUNTER (PREAMBLE _ POWER _ ramp _ COUNTER); and/or the UE resets (to 0) the preamble transmission counter; when the downlink beam RSRP (or RSRQ) measured by the UE is smaller than (or not larger than) a threshold value (preset or configured by the base station), the UE increases a PREAMBLE POWER ramp COUNTER (PREAMBLE _ POWER _ RAMPING _ COUNTER) + 1; it should be noted that the preset value added by the preamble power ramp counter is 1; and/or the UE sends a preamble transmission counter +1, where it needs to be noted that the preset value added by the preamble transmission counter is 1; this is to balance power compensation and avoid causing excessive interference to the original ra user when the UE switches to the four-step ra.

■ if the UE retries 2-step random access and the previous 2-step random access.

If the PREAMBLE transmitted by the 2-step random access is the same as the PREAMBLE transmission beam transmitted by the 2-step random access, and/or the selected downlink beam is not changed, and/or the PUSCH transmitted by the 2-step random access is the same as the PUSCH transmission beam transmitted by the 2-step random access, the UE may use a PREAMBLE POWER ramp-up COUNTER (PREAMBLE _ POWER _ ramp _ COUNTER) + 1; it should be noted that the preset value added by the preamble power ramp counter is 1;

if the PREAMBLE transmitted by the 2-step random access is different from the PREAMBLE transmission beam transmitted by the 2-step random access, and/or the selected downlink beam is changed, and/or the PUSCH transmitted by the 2-step random access is different from the PUSCH transmission beam transmitted by the 2-step random access, the UE transmission POWER RAMPING suspension (POWER RAMPING suspension) is indicated to the higher layer and the PREAMBLE _ POWER _ sounding _ COUNTER is unchanged.

■ if the UE retries 2-step random access and the previous time was 4-step random access.

If the PREAMBLE transmitted by the 2-step random access is the same as the PREAMBLE transmission beam transmitted by the 4-step random access, and/or the selected downlink beam is not changed, the UE may ramp up the PREAMBLE POWER by a COUNTER (PREAMBLE _ POWER _ RAMPING _ COUNTER) + 1; it should be noted that the preset value added by the preamble power ramp counter is 1;

if the PREAMBLE transmitted for the 2-step random access is not the same as the PREAMBLE transmission beam transmitted for the 4-step random access, and/or the selected downlink beam is changed, the UE transmission POWER RAMPING suspension (POWER RAMPING suspension) is indicated to the higher layer and PREAMBLE _ POWER _ RAMPING _ COUNTER is not changed.

Specifically, in the conventional four-step random access process, or in the two-step random access; the UE may send a power ramping suspension (power ramping suspension) indication to higher layers for one or more of the following:

1. because of the power allocation for the transmission of the PUSCH/PUCCH/PRACH/SRS, the UE does not transmit the PRACH, or the UE transmits the PRACH with reduced power, or the UE transmits a part of the PRACH (for example, only transmits a part of time domain units or frequency domain units of the time frequency resource where the PRACH is located);

2. because in Dual Connectivity (DC), e.g., power allocation in dual connectivity EN-DC of 4G radio access network with 5G NR, dual connectivity NE-DC of 5G NR with 4G radio access network, 5G NR dual connectivity NR-DC, the UE does not transmit PRACH, or the UE transmits PRACH with reduced power, or the UE transmits part of PRACH (e.g., only a part of time domain unit or frequency domain unit of time frequency resource where PRACH is transmitted);

3. because the UE does not detect the downlink control information format 2_0 providing the slot format (slot format), the UE does not send the PRACH, or the UE sends the PRACH with reduced power, or the UE sends part of the PRACH (for example, only sends a part of time domain units or frequency domain units of the time frequency resource where the PRACH is located);

4. because the UE detects the downlink control information format 2_0 providing a slot format (slot format), but the detected slot format indicates that the PRACH occupies a flexible (flexible) or downlink (downlink) symbol; the UE does not send the PRACH, or the UE sends the PRACH with reduced power, or the UE sends a part of the PRACH (for example, only sends a part of time domain units or frequency domain units of the time frequency resource where the PRACH is located);

5. because of the operation of determining the slot format, the UE does not transmit the PRACH, or the UE transmits the PRACH with reduced power, or the UE transmits a part of the PRACH (for example, only transmits a part of time domain units or frequency domain units of the time-frequency resource where the PRACH is located);

6. because transmission opportunities (transmission occasions) of the PRACH/PUCCH/PUSCH/SRS are in the same slot, or the two are spaced apart by a small distance, for example, smaller than (and/or equal to) a given threshold, the UE does not transmit the PRACH, or the UE transmits the PRACH with reduced power, or the UE transmits a part of the PRACH (for example, only transmits a part of a time domain unit or a frequency domain unit of a time-frequency resource in which the PRACH is located).

It should be noted that the PRACH in 1-6 may be a PRACH with a message a or a message a in two-step random access, or may be a PRACH with four-step random access. The PUSCH in 1-6 above may also be the PUSCH of message a in two-step random access.

Example two

Another random access transmission method is provided in this embodiment, and is applied to a UE, where a flowchart of the method is shown in fig. 4, and the method includes:

step S201, resource configuration information of random access of the unlicensed spectrum is obtained.

Step S202, according to the resource configuration information of random access of the unlicensed spectrum, one or more effective random access opportunities (RO) for random access of the unlicensed spectrum are determined.

Step S203, selecting an effective random access opportunity of the one or more effective random access opportunities, and performing random access transmission, where the random access transmission includes sending a preamble on the random access opportunity.

In the embodiment of the application, resource configuration information of random access of an unlicensed spectrum is obtained; determining one or more effective random access opportunities (RO) for random access of the unlicensed spectrum according to the resource configuration information of the random access of the unlicensed spectrum; selecting one effective random access opportunity from one or more effective random access opportunities to perform random access transmission, wherein the random access transmission comprises sending a preamble on the random access opportunity, and thus, the two-step random access transmission is realized.

Optionally, determining one or more valid random access opportunities RO for random access of the unlicensed spectrum according to the resource configuration information of random access of the unlicensed spectrum, including:

obtaining configured RO according to the resource configuration information of random access of the unlicensed spectrum;

and judging the configured RO to be a valid RO according to a judgment criterion.

Optionally, the judgment criterion includes at least one of:

the configured RO is valid only after N time units after the last possible candidate position of the last SSB indicated by the SSB configuration information in an uplink and downlink configuration period, wherein N is a non-negative integer;

the configured RO is a valid RO only after N time units after the last possible candidate position indicated by the SSB configuration information in one uplink and downlink configuration period, N being a non-negative integer.

Optionally, the UE may obtain resource configuration information of random access of the unlicensed spectrum from at least one of:

3. upper layer control signaling such as RRC configuration information obtained from the network side or the system information sent by the network side;

4. pre-configured parameter information.

5. In the broadcast channel (PBCH, including MIB, SIB) sent by the network side.

Wherein the resource configuration information of random access of the unlicensed spectrum at least comprises one of the following items

■ four steps random access configuration period, P _4 STEPRACH;

■ random access opportunity number;

■ one or more CSI-RS indexes for four-step random access;

■ number of 4STEPRO mapped by one CSI-RS;

■ one or more 4STEPRO indices of a CSI-RS map.

2. Random access resource configuration information of the two-step random access; including at least one of:

■ two-step random access configuration period, P _2 STEPRACH;

■ number of random access opportunities in two steps;

■ one or more CSI-RS indices for two-step random access;

■ number of 2STEPRO mapped by one CSI-RS;

■ one or more 2STEPRO indices of a CSI-RS map;

■ specifically, if the parameters in the two-step random access configuration information are not configured separately, the UE may determine the relative relationship between the parameters in the four-step random access configuration information, for example, the four-step random access configuration period and a predefined or configured extended parameter are calculated to obtain the two-step random access configuration period.

3. Downlink beam (e.g., SSB and/or CSI-RS, described below with SSB as an example) configuration information, including at least one of:

■ downlink beam period size;

■ the number of downlink beams transmitted in one downlink beam period;

■ index of downlink beam transmitted in one downlink beam period;

■ candidate position (candidate position) and index (candidate position index, y _ id; when SCS is 15khz, y _ id is {0 ~ 9}, or when SCS is 30khz, y _ id is {0 ~ 19}) of downlink beam transmitted in one downlink beam period;

■ QCL parameter Q value size.

Optionally, after the UE obtains the configuration information, it needs to determine whether the configured random access opportunity is a valid RO, and then determine a mapping relationship from the SSB to the RO. By at least one of:

● judgment criteria 1: the configured RO is only the effective RO of the part indicated as the uplink in the uplink and downlink configuration information in one uplink and downlink configuration period;

● decision criteria 2: the configured RO is only the effective RO of the part indicated as non-downlink in the uplink and downlink configuration information in one uplink and downlink configuration period;

● decision criterion 3: the configured RO is valid only after one or more time units after the part indicated as downlink in the uplink and downlink configuration information in one uplink and downlink configuration period;

● decision criterion 4: the determination is made by the index of the SSB transmitted in one configured downlink beam period, and at this time, the index of the SSB transmitted in one downlink beam period has a corresponding relationship with the candidate position (candidate position) and the index (candidate position index) of the configuration, that is, the determination criterion is:

■, the configured RO is a valid RO only after N (N is a non-negative integer) time units after the last possible candidate location indicated in the uplink and downlink configuration information as the last SSB in the SSB configuration information in one uplink and downlink configuration period. As illustrated in FIG. 5, if the network can send 4 SSBs, SSBs 0-3 at most, the configuration information informs that 3 SSBs are actually sent and that

SSBs

0, 1, 3 are sent; and the SSB index matches the maximum number of SSBs that can transmit SSBs when matching the candidate position, for example, at 15khz, y _ id is 0, SSBs 0 can be transmitted at4, 8, y _ id is 1,5,9, SSBs 1, y _ id is 2, SSBs 2 at 6, y _ id is 3, and SSBs 3 can be transmitted at 7. In this case, the last possible candidate position indicated as the last SSB in the SSB configuration information in the uplink and downlink configuration information is the last possible candidate position y _ id — 7 corresponding to SSB3, as shown in fig. 5, where N is 0. In particular, the

candidate location indices

8,9 may not be used because the entire possible SSB cannot be completely mapped.

● decision criterion 5: the candidate position (candidate position) and the index (candidate position index) within one configured downlink beam period are used for determining, that is, the determination criterion is at least one of the following:

■ criterion 5.1: the configured RO is a valid RO only N (N is a non-negative integer) time units after the last possible candidate position in the SSB configuration information indicated in the uplink and downlink configuration information in one uplink and downlink configuration period. As illustrated in fig. 6, at 15khz, no matter how many SSBs are sent by the network at this time, or the maximum number of SSBs that can be sent, in this case, the last possible candidate position y _ id in the uplink and downlink configuration information indicated in the SSB configuration information is 9, and as shown in fig. 6, N is 0. Specifically, because the entire possible SSB cannot be completely mapped, the

candidate location indexes

8 and 9 may not be used, and at this time, the last possible candidate location indicated in the uplink and downlink configuration information as SSB configuration information is y _ id — 7.

■ criterion 5.2: the configured RO is a valid RO only after N (N is a non-negative integer) time units from the last possible candidate position indicated by the uplink and downlink configuration information in the uplink and downlink configuration period as the last SSB in the SSB configuration information, and the SSB index at this time is a virtual SSB index, that is, obtained by the configured number sequence number of the actually sent SSBs, for example, 3 SSBs are sent, and then the SSB index is 0, 1, 2 at this time. For example, at 15khz, SSB0 may be transmitted at y _

id

0, 3, 6, 9, SSB1 may be transmitted at y _

id

1,4,7, SSB2 may be transmitted at y _

id

2,5, 8. Then, as shown in fig. 7, N is 0, and at this time, the last possible candidate location indicated as the last SSB in the SSB configuration information in the uplink and downlink configuration information is the last possible candidate location index 8 corresponding to the SSB 2.

● decision criteria 6: the determination is made by the index of the SSB transmitted in one configured downlink beam period, and at this time, the index of the SSB transmitted in one downlink beam period has a corresponding relationship with the candidate position (candidate position) and the index (candidate position index) of the configuration, that is, the determination criterion is:

■, the configured RO is a valid RO only after N (N is a non-negative integer) time units after the last possible candidate location where the transmitted SSB indicated in the SSB configuration information and the quasi-co-located (QCL) SSB thereof are located in the uplink and downlink configuration information in one uplink and downlink configuration period, where the SSB quasi-co-located (QCL) with the transmitted SSB indicated in the SSB configuration information is determined by the UE through the configured QCL size Q, and if SSB i mod Q is SSB j mod Q, SSB i and SSB j are quasi-co-located. As illustrated in FIG. 11, if the network can send a maximum of 8 SSBs, SSBs 0-7, the configuration information informs that 2 SSBs are actually sent, for example, SSB0, 2 is sent; (in this case, the UE understands that the network side wants to send the SSB0, SSB2), and the SSB index matches the maximum number of SSBs that can send the SSB when the candidate location is located, for example, at 15khz, the SSBs 0 to 7 can be sent when y _ id is 0 to 7, the

SSBs

0, 1 can be sent when y _ id is 8, and 9. Q is configured or predefined as 4, i.e., Q ═ 4; then SSB quasi co-located with SSB0 is SSB4, SSB co-located with SSB2 is SSB6, then SSB0, 4 can correspond to the candidate location y _

id

0,4,8 and SSB2, 6 can correspond to the candidate location y _

id

2, 6; in this case, in the uplink and downlink configuration period, the last possible candidate location where the transmitted SSB indicated in the SSB configuration information and the quasi co-located SSB thereof are located in the uplink and downlink configuration information is y _ id ═ 8, and when N ═ 0, as illustrated in fig. 11. Specifically, the

candidate location indexes

8 and 9 may not be used because the entire possible SSB cannot be completely mapped, and then the last possible candidate location in the transmitted SSB indicated in the SSB configuration information and the quasi-collocated SSB in the uplink and downlink configuration period is y _ id ═ 6, as shown in fig. 12.

Optionally, after the UE determines a valid RO, the SSB-to-RO mapping is determined based on the configured SSB-to-RO mapping parameters and the mapping rules, and a possible RO is selected based on the selected SSB or the SSB that is quasi co-located and in the configured SSB and corresponds to the selected SSB, and the preamble is sent. For example, the configured SSB is SSB0, 2 sent, based on the configured Q value, there is SSB0 quasi co-located with SSB4, and SSB2 quasi co-located with SSB 6; the UE calculates the mapping relationship with the RO according to SSB0 and SSB2, and when the SSB selected by the UE is SSB0 or SSB4 (for example, the LBT of the gNB fails at SSB0 but succeeds at SSB4, that is, SSB4 is currently sent), finds the corresponding RO according to the mapping relationship of SSB0, that is, SSB0 and SSB4 have the same mapping relationship, that is, the corresponding mapped RO and preamble.

Specifically, when the system does not indicate the uplink and downlink configuration information, that is, when there is no uplink and downlink configuration period, the uplink and downlink configuration information and the uplink and downlink configuration period may be replaced by one of the following:

● configuration period of downlink beam;

● configuration period of random access;

● mapping ring of downlink beam and RO, or mapping period, or mapping pattern period;

specifically, the UE needs to perform an LBT operation before the selected RO before sending the preamble, and when the result of LBT passes successfully, the UE sends the preamble, and when the result of LBT fails, the UE does not send the preamble but finds the next possible RO and performs the LBT operation. In addition, for the UE, after sending the preamble, obtaining a feedback (RAR) from the network side to continue the subsequent PUSCH transmission (message three for contention 4-step random access, and PUSCH transmission scheduled by RAR for contention-free random access), it is also necessary to know the type and priority information of LBT that needs to be performed before the subsequent PUSCH. Wherein, the UE needs to know the kind and priority information of the LBT performed, at least one of the following methods may be used:

1. the network side presets or notifies the kind and/or priority information of LBT through the system broadcast message, if CAT4 is defaulted, the priority is 0;

2. the network side indicates the kind of LBT through 1 bit "R" in RAR, or 1 bit "channel status information feedback" reserved in the uplink grant, or newly added bit field, such as "0" for CAT2 LBT and "1" for CAT4 LBT; the priority information is notified by presetting or system broadcast messages;

3. the network side indicates priority information through 1 bit "R" in the RAR, or 1 bit "channel state information feedback" reserved in the uplink grant and/or a newly added bit field, for example, "0" represents priority 0, and "1" represents priority 1; the kind of LBT is notified by preset or system broadcast message, for example, fixed as CAT4 LBT;

4. the network side comprehensively indicates 4 combinations of the class and/or priority information indicating LBT by 1 bit "R" in RAR and 1 bit "channel state information feedback" reserved in the uplink grant and/or newly added bit field, for example:

in particular, it may also be:

in particular, it may also be:

the priority information may be a priority preset by the system, for example, when the priority is indicated as CAT4, the UE performs the LBT operation according to priority 1;

5. indicating the type and/or priority information of one or more LBTs of subsequent uplink transmission (including PRACH, PUCCH and PUSCH) through a downlink control channel of scheduling system information; LBT of priority 1 for CAT4 before subsequent RO is indicated in a downstream control channel, e.g., scheduling system information; specifically, the downlink control channel of the scheduling system information indicates 25us LBT of CAT2, the LBT of priority 1 of CAT4, and also indicates the current downlink transmission, for example, the Channel Occupancy Time (COT) provided by a Downlink Reference Signal (DRS) window where the current downlink control channel is located, and then the UE determines:

a) when the subsequent valid RO is completely or partially within the COT range, the UE selects an LBT class and/or priority of a higher class or a higher priority according to the indication of the downlink control channel of the scheduling system information or the preconfigured LBT class and/or priority, for example, in the example, the UE selects 25us LBT of CAT2, as shown in fig. 13;

b) when the subsequent valid RO is out of the COT range, the UE selects a lower-class or lower-priority LBT class and/or priority according to the indication of the downlink control channel of the scheduling system information or the preconfigured LBT class and/or priority, for example, in the example, the UE selects LBT of priority 1 of CAT4, as shown in fig. 13.

EXAMPLE III

Based on the same inventive concept of the foregoing embodiment, an embodiment of the present application further provides a UE, and a schematic structural diagram of the UE is shown in fig. 8, where the UE80 includes a first processing module 801, a second processing module 802, and a third processing module 803.

A first processing module 801, configured to obtain resource configuration information of an uplink signal;

a second processing module 802, configured to obtain resource configuration information of two-step random access according to the resource configuration information of the uplink signal;

a third processing module 803, configured to determine resources used for two-step random access transmission according to the resource configuration information of the two-step random access, and perform two-step random access transmission, where the two-step random access transmission includes sending a preamble on a random access opportunity RO and sending data of the two-step random access on a physical uplink shared channel PUSCH.

fourthly, randomly accessing configuration information;

random access resource configuration information of the two-step random access;

downlink beam configuration information;

and data resource configuration information of two-step random access.

Optionally, the second processing module 802 is specifically configured to determine one or more ROs and one or more preambles for two-step random access according to the resource configuration information of the uplink signal, the first mapping information, and the second mapping information; selecting one or more RO and one of one or more preamble, and determining available PUSCH resources, wherein the available PUSCH resources comprise PUSCH time-frequency resources and/or DMRS port resources.

determined by the SCS of the random access preamble;

For the content that is not described in detail in the UE provided in the embodiment of the present application, reference may be made to the transmission method for random access, and the beneficial effects that the UE provided in the embodiment of the present application can achieve are the same as the transmission method for random access, which is not described herein again.

Example four

Based on the same inventive concept of the foregoing embodiments, an embodiment of the present application further provides a UE, and a schematic structural diagram of the UE is shown in fig. 9, where the UE90 includes a fourth processing module 901, a fifth processing module 902, and a sixth processing module 903.

A fourth processing module 901, configured to obtain resource configuration information of random access of an unlicensed spectrum;

a fifth processing module 902, configured to determine, according to resource configuration information of random access of an unlicensed spectrum, one or more valid random access opportunities RO for the random access of the unlicensed spectrum;

a sixth processing module 903, configured to select an effective random access opportunity from the one or more effective random access opportunities, and perform random access transmission, where the random access transmission includes sending a preamble on the random access opportunity.

Optionally, the fifth processing module 902 is specifically configured to obtain a configured RO according to resource configuration information of random access of an unlicensed spectrum; and judging the configured RO to be a valid RO according to a judgment criterion.

Optionally, the judgment criterion includes at least one of:

EXAMPLE five

Based on the same inventive concept of the first and second embodiments, the embodiment of the present application further provides a UE, a schematic structural diagram of the UE is shown in fig. 10, the UE1000 includes at least one processor 1001, a memory 1002 and a bus 1003, and the at least one processor 1001 is electrically connected to the memory 1002; the memory 1002 is configured to store at least one computer executable instruction, and the processor 1001 is configured to execute the at least one computer executable instruction, so as to perform the steps of any random access transmission method provided in any one of the first embodiment and the second embodiment or any one of the alternative embodiments of the present application.

Further, the processor 1001 may be an FPGA (Field-Programmable Gate Array) or other devices with logic processing capability, such as an MCU (micro controller Unit) and a CPU (Central processing Unit).

The application of the embodiment of the application has at least the following beneficial effects:

the transmission of two-step random access is realized.

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions may be implemented by a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, implement the aspects specified in the block or blocks of the block diagrams and/or flowchart illustrations disclosed herein.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims

1. A transmission method of random access is applied to User Equipment (UE), and is characterized by comprising the following steps:

acquiring resource configuration information of an uplink signal;

and determining resources used for two-step random access transmission according to the resource configuration information of the two-step random access, and performing the two-step random access transmission, wherein the two-step random access transmission comprises sending a preamble on a random access opportunity (RO) and sending the two-step random access data on a Physical Uplink Shared Channel (PUSCH).

2. The method of claim 1, wherein the resource configuration information of the uplink signal comprises at least one of:

fourthly, randomly accessing configuration information;

random access resource configuration information of the two-step random access;

downlink beam configuration information;

and data resource configuration information of two-step random access.

3. The method according to claim 2, wherein the data resource configuration information of the two-step random access includes at least one of time-frequency resource configuration information of PUSCH, uplink demodulation reference signal (DMRS) configuration information;

the time-frequency resource configuration information of the PUSCH comprises a time range where the selected RO is located, wherein the time range comprises:

4. A method according to claim 1 or 3, comprising:

obtaining first mapping information from a downlink beam to an RO according to the resource configuration information of the uplink signal, wherein the first mapping information comprises at least one of a mapping period from a synchronous signal block SSB to the RO and a mapping pattern period from the SSB to the RO;

and obtaining second mapping information from a channel state information reference signal (CSI-RS) to the RO according to the resource configuration information of the uplink signal, wherein the second mapping information comprises at least one of a CSI-RS to RO mapping period and a CSI-RS to RO mapping pattern period.

5. The method according to claim 4, wherein the obtaining resource allocation of two-step random access according to the resource allocation information of the uplink signal comprises:

determining one or more ROs and one or more preambles of two-step random access according to the resource configuration information of the uplink signal, the first mapping information and the second mapping information;

6. The method of claim 5, wherein determining available PUSCH resources according to the selected RO comprises:

7. The method of claim 6, wherein determining available PUSCH resources according to the selected RO comprises:

when the UE obtains configured PUSCH resources for two-step random access and when one or more configured PUSCH time-frequency resource units and the selected RO are in different time slots, the UE can select the PUSCH time-frequency resource units in the same time slot with the selected RO to send data of the two-step random access;

or, when the UE obtains configured PUSCH resources for two-step random access and when one or more configured PUSCH time-frequency resource elements and other ROs within a time range of the selected RO are in different time slots, the UE may select another RO within the time range of the selected RO to send data for two-step random access on the PUSCH time-frequency resource element in the same time slot.

8. The method of claim 7, wherein the length of the time slot is determined by a specific subcarrier spacing, and wherein the method comprises at least one of:

determined by the SCS of the random access preamble;

9. The method of claim 8, wherein after the UE sends a preamble and the data for the two-step random access on PUSCH, the UE searches for two-step random access feedback information within a control information search space configured by a network, and wherein the UE performs a random access retry when the feedback information comprises a non-matching collision resolution identity.

10. The method of claim 9, wherein the UE is to perform a random access re-attempt, and wherein the random access re-attempt comprises at least one of:

when the transmission beam of the lead code of the two-step random access is different from the transmission beam of the lead code of the two-step random access, and/or the selected downlink beam is changed, and/or the transmission beam of the PUSCH of the two-step random access is different from the transmission beam of the PUSCH of the two-step random access, the UE transmission power climbing and suspending indication is sent to the high layer, and the lead code power climbing counter is unchanged;

and when the wave beam for sending the lead code of the two-step random access is different from the wave beam for sending the lead code of the four-step random access, and/or the selected downlink wave beam is changed, the UE sends a power climbing pause instruction to a high layer and the wave beam power climbing counter is not changed.

11. A transmission method of random access is applied to UE, and is characterized by comprising the following steps:

12. The method of claim 11, wherein the determining one or more valid random access opportunities (ROs) for random access of the unlicensed spectrum according to the resource configuration information of random access of the unlicensed spectrum comprises:

13. A UE, comprising:

and a third processing module, configured to determine resources used for two-step random access transmission according to the resource configuration information of the two-step random access, and perform two-step random access transmission, where the two-step random access transmission includes sending a preamble on a random access opportunity RO and sending data of the two-step random access on a physical uplink shared channel PUSCH.

14. A UE, comprising:

a fifth processing module, configured to determine, according to resource configuration information of random access of the unlicensed spectrum, one or more valid random access opportunities (ROs) for random access of the unlicensed spectrum;

15. A UE, comprising: a processor; and

a memory configured to store machine readable instructions which, when executed by the processor, cause the processor to perform the transmission method of random access of any one of claims 1-12.