Patent Description:
The present application relates to the technical field of wireless communications, and in particular, to random access methods and devices.

New Radio (NR) Rel-<NUM> defines a Synchronization Signal Block (SS Block) that occupies <NUM> Orthogonal Frequency Division Multiplexing (OFDM) symbols, in an order of a Primary Synchronized Signal (PSS), a Physical Broadcast Channel (PBCH), a Secondary Synchronization Signal (SSS) and a PBCH, and supports <NUM>/<NUM>/<NUM>/<NUM> Subcarrier Spacings (SCSs). A default cycle and a configuration cycle are supported. The default cycle is <NUM>, and is used for initial cell searching. The configuration cycle from <NUM> to <NUM> can be used in CONNECTED/IDLE and non-stand alone networking scenes. For the default cycle and the configuration cycle, all SS Blocks of an SS Block burst set are transmitted within <NUM>. The SS Blocks include candidate SS Blocks and actual SS Blocks. According to different frequency bands, the maximum number L of the candidate SS blocks of one SS Block burst set is different, and a base station selects actually transmitted SS Blocks from a candidate SS Block set according to an actual situation, that is, the number of actual SS Blocks can be less than or equal to L.

The first portion of minimum system information required for terminal retention, random access and other processes is transmitted by the PBCH, and the remaining portion is transmitted by using Remaining Minimum System Information (RMSI). The RMSI uses a Physical Downlink Shared Channel (PDSCH) scheduled by a Physical Downlink Control Channel (PDCCH) for transmission. In order to extend the coverage, a beam scanning method is also used. A control resource set (CORESET) corresponding to time and frequency resources where the RMSI PDCCH is located is configured by the PBCH. The RMSI and the SS Blocks can adopt Frequency Domain Multiplexing (FDM) and Time Domain Multiplexing (TDM) methods.

At present, for a Time Division Duplex (TDD) mode, in a random access process, a terminal performs, according to a Physical Random Access Channel (PRACH) time domain resource configured by the base station, random access through a time slot where the PRACH time domain resource is located. However, since the time slot used by the terminal for the random access may include a time domain resource occupied by a downlink channel for transmitting the SS Blocks and/or the RMSI, the time domain resource used by the terminal for the random access and the time domain resource occupied by the downlink channel for transmitting the SS Blocks and/or the RMSI may be conflicted.

The embodiments of the present application provide a random access method and device to solve the problem that a time domain resource used by a terminal for random access and a time domain resource occupied by a downlink channel for transmitting Synchronization Signal Blocks (SS Blocks) and/or Remaining Minimum System Information (RMSI) may be conflicted in the prior art. Specific embodiments are defined in the dependent claims.

According to the embodiments of the present application, during the random access, the terminal acquires the PRACH time domain resource configured by the base station; since the time domain resource includes at least one time slot, before the terminal transmits a random access preamble to the base station, the terminal firstly determines whether the at least one time slot configured by the base station includes the first type of OFDM symbols used for transmitting the SS Blocks. If the time slot includes the first type of OFDM symbols, the terminal performs the random access through the OFDM symbol different from the first type of OFDM symbols in the at least one time slot, so that the terminal avoids a conflict between a resource used for the random access and a resource occupied by a downlink channel for transmitting the SS Blocks, and the system performance is further improved.

The accompanying drawings described here are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:.

Hereinafter, some terms in the embodiments of the present application will be explained to facilitate understanding by those skilled in the art.

In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

As shown in <FIG>, a random access system according to an embodiment of the present application includes: a terminal <NUM> and a base station <NUM>.

The terminal <NUM> is configured to acquire a Physical Random Access Channel (PRACH) time domain resource configured by the base station for the terminal, wherein the PRACH time domain resource includes at least one time slot; and perform random access through an Orthogonal Frequency Division Multiplexing (OFDM) symbol different from a first type of OFDM symbols in the at least one time slot when it is determined that the at least one time slot includes the first type of OFDM symbols used for transmitting Synchronization Signal Blocks (SS Block) and/or Remaining Minimum System Information (RMSI).

The base station <NUM> is configured to acquire the PRACH time domain resource configured for the terminal, wherein the PRACH time domain resource includes at least one time slot; and receive and detect the PRACH on the OFDM symbol different from the first type of OFDM symbols in the at least one time slot when it is determined that the at least one time slot includes the first type of OFDM symbols used for transmitting the SS Blocks and/or the RMSI.

According to the embodiments of the present application, during the random access, the terminal acquires the PRACH time domain resource configured by the base station; and since the time domain resource includes at least one time slot, before the terminal transmits a random access preamble to the base station, the terminal firstly determines whether the at least one time slot configured by the base station includes the first type of OFDM symbols used for transmitting the SS Blocks and/or the RMSI. If the time slot includes the first type of OFDM symbols, the terminal performs the random access through the OFDM symbol different from the first type of OFDM symbols in the at least one time slot, so that the terminal avoids a conflict between a resource used for the random access and a resource occupied by a downlink channel for transmitting the SS Blocks and/or the RMSI, and the system performance is further improved.

The dimension of the PRACH resource of the embodiment of the present application includes: a time domain, a frequency domain and a code domain.

The definition of the PRACH time domain resource depends on a radio frame, a sub-frame, a time slot and an OFDM symbol corresponding to a PRACH format. One radio frame includes <NUM> sub-frames (<NUM>), and one sub-frame includes one or more time slots. When a Subcarrier Spacing (SCS) is <NUM>, one time slot is included. When the SCS is <NUM>/<NUM>/<NUM>, <NUM>/<NUM>/<NUM> time slots are respectively included.

The PRACH time domain resource configured by the base station of the embodiment of the present application for the terminal at least indicates the time slot. Specifically, the PRACH time domain resource includes at least one time slot.

Before the terminal performs the random access by using the PRACH time domain resource configured by the base station, whether the at least one time slot configured by the base station includes the first type of OFDM symbols for transmitting the SS Blocks and/or the RMSI is determined.

If YES, the terminal performs the random access through the OFDM symbol different from the first type of OFDM symbols in the at least one time slot. If NO, the terminal selects a required OFDM symbol according to a configured PRACH format and a start OFDM symbol position in the whole time slot configured by the base station, and performs the random access in combination with a frequency domain resource configured by the base station.

Correspondingly, before the base station receives and detects the PRACH, whether the at least one time slot configured for the terminal includes the first type of OFDM symbols for transmitting the SS Blocks and/or the RMSI or not is determined.

If YES, the base station receives and detects the PRACH on the OFDM symbol different from the first type of OFDM symbols in the at least one time slot. If NO, the base station selects an OFDM symbol to be detected according to the configured PRACH format and the start OFDM symbol position in the whole time slot configured for the terminal, and receives and detects the PRACH in combination with the frequency domain resource configured by the base station.

In the invention, the terminal performs the random access according to any one of the following manners when it is determined that the at least one time slot includes the first type of OFDM symbols used for transmitting the SS Blocks and/or the RMSI.

Manner I, the terminal performs the random access at a time slot which does not include the first type of OFDM symbols. The embodiment corresponding to the Manner I is not covered by the subject-matter of the claims.

Correspondingly, the base station receives and detects the PRACH at the time slot which does not include the first type of OFDM symbols.

When Manner I is used, the terminal may only perform the random access through the time slot which does not include the first type of OFDM symbols. If the PRACH time domain resource currently configured by the base station for the terminal does not have the time slot which does not include the first type of OFDM symbols, the terminal does not perform the random access within this PRACH transmission cycle, and waits for the next PRACH transmission cycle.

Correspondingly, the base station may only receive and detect the PRACH through the time slot which does not include the first type of OFDM symbols. If the currently configured PRACH does not have the time slot which does not include the first type OFDM symbols, the base station does not receive and detect the PRACH within this PRACH transmission cycle, and waits for the next PRACH transmission cycle.

Manner II, the terminal performs the random access through continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

Correspondingly, the base station receives and detects the PRACH on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

The two manners are described in detail below.

Case I, the terminal performs the random access at a time slot which does not include the first type of OFDM symbols.

Correspondingly, the base station performs the random access at the time slot which does not include the first type of OFDM symbols.

The terminal may determine a random access manner according to the following manners.

The random access manner may be Manner I or Manner II.

Correspondingly, the base station determines the PRACH receiving and detection manner according to the pre-configured rule.

It should be noted that the pre-configured rule may be protocol pre-definition, and is pre-configured to the terminal and the base station.

(II) The terminal receives an indication signaling transmitted by the base station through the RMSI, and determines the random access manner according to the indication signaling. (This manner is not covered by the subject-matter of the claims.

Correspondingly, the base station determines the manner that the terminal performs the random access according to information such as a cell radius and a cell load, and informs the manner that the terminal performs the random access to the terminal by means of the indication signaling. Optionally, the indication signaling is carried in the RMSI.

The random access manner corresponding to Case I is described in detail below.

The terminal determines whether the current time slot includes the first type of OFDM symbols. If NO, the terminal performs the random access in this time slot. If NO, the terminal does not perform the random access within this PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

Correspondingly, the base station determines whether the current time slot includes the first type of OFDM symbols. If NO, the base station receives and detects the PRACH in this time slot. If YES, the base station does not receive and detect the PRACH within this PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

The PRACH time domain resource configured by the base station for the terminal includes a plurality of time slots.

The terminal determines whether the current time slot includes the first type of OFDM symbols. If NO, the terminal performs the random access in this time slot. If YES, the terminal determines whether the next time slot in the plurality of configured time slots includes the first type of OFDM symbols until a time slot which does not include the first type of OFDM symbols is determined, and performs the random access in the time slot which does not include the first type of OFDM symbols. If the plurality of configured time slots all include the first type of OFDM symbols, the terminal does not perform the random access within this PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

Correspondingly, the base station determines whether the current time slot includes the first type of OFDM symbols. If NO, the base station receives and detects the PRACH in this time slot. If YES, the base station determines whether the next time slot in the plurality of time slots configured for the terminal includes the first type of OFDM symbols until a time slot which does not include the first type of OFDM symbols is determined, and receives and detects the PRACH in the time slot which does not include the first type of OFDM symbols. If the plurality of configured time slots all include the first type of OFDM symbols, the base station does not receive and detect the PRACH within this PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

It should be noted that when the terminal performs the random access in the time slot which does not include the first type of OFDM symbols, a specific random access method may use a method in the prior art, and no details will be described here.

Similarly, when the base station receives and detects the PRACH in the time slot which does not include the first type of OFDM symbols, a specific PRACH receiving and detection method may use a method in the prior art, and no details will be described here.

Case II, the terminal performs the random access on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, or performs the random access in the time slot which does not include the first type of OFDM symbols.

Correspondingly, the base station receives and detects the PRACH on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, or receives and detects the PRACH in the time slot which does not include the first type of OFDM symbols.

It should be noted that in Case II, the terminal may perform the random access in any manner, and correspondingly, the base station may receive and detect the PRACH in any manner.

(II) The terminal receives an indication signaling transmitted by the base station through the RMSI, and determines the random access manner according to the indication signaling. This embodiment is not covered by the subject-matter of the claims.

Before the terminal performs the random access on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the terminal needs to determine whether the time slot including the first type of OFDM symbols satisfies a condition.

Optionally, the terminal determines that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

The number of actually used OFDM symbols for the random access is equal to the number of OFDM symbols included in the PRACH format configured by the base station for the terminal.

In one time slot, the number of the remaining continuous symbols refers to a maximum number of continuous OFDM symbols except OFDM symbols occupied by a downlink channel and a signal, the number of remaining continuous OFDM symbols is calculated according to a Subcarrier Spacing (SCS) of the downlink channel and the signal, and a duration of the continuous OFDM symbols used for uplink random access transmission is calculated according to an SCS of an uplink PRACH format, so that the number of continuous OFDM symbols actually available for the uplink random access is calculated according to a ratio relation between the uplink SCS and the downlink SCS.

Optionally, the terminal determines the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners.

The terminal determines a ratio of an SCS of a PRACH configured by the base station to an SCS of an SS Block. The terminal determines a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

Correspondingly, before the base station receives and detects the PRACH on the OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the base station also needs to determine whether the time slot including the first type of OFDM symbols satisfies a condition.

The base station determines that in the time slot including the first type of OFDM symbols, the number of the remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

The number of the actually used OFDM symbols for the random access is equal to the number of OFDM symbols included in the PRACH format configured by the base station for the terminal.

Optionally, the base station determines the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners.

The base station determines a ratio of an SCS of a PRACH configured for the terminal to an SCS of an SS Block. The base station determines a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

It should be noted that the methods used by the terminal and the base station to determine the number of the remaining continuous OFDM symbols for the uplink transmission are the same.

The following several specific examples illustrate that the method for determining the number of the remaining continuous OFDM symbols for the uplink transmission is also applicable to the terminal and the base station.

It is defined that the number of the remaining continuous OFDM symbols in one time slot is T1. The number of the remaining continuous OFDM symbols is a maximum number of the continuous OFDM symbols except the OFDM symbols occupied by the downlink channel and the signal in the time slot. It is defined that the number of the remaining continuous OFDM symbols for the uplink transmission is T2. The SS Block for downlink transmission is taken as an example for illustration. The SCS of the SS Block may be <NUM>, <NUM>, <NUM>, and <NUM>, and the SCS of the PRACH for uplink transmission may be <NUM>, <NUM>, <NUM>, and <NUM>. The ratio of the SCS of the PRACH to the SCS of the SS Block is defined.

The following formula (<NUM>) provides a relation of T2, T1, and ratio: <MAT>.

Example <NUM>: SCS (SS Block) = <NUM>, SCS (SS PRACH) = <NUM>, the ratio of the SCS of the PRACH to the SCS of the SS Block is equal to <NUM>, and T2 = T1* ratio = T1*<NUM>.

Example <NUM>: SCS (SS Block) = <NUM>, SCS (SS PRACH) = <NUM>, the ratio of the SCS of the PRACH to the SCS of the SS Block is equal to <NUM>/<NUM>, and T2 = T1* ratio = T1*<NUM>/<NUM>.

Example <NUM>: SCS (SS Block) = <NUM>, SCS (PRACH) = <NUM>, the ratio of the SCS of the PRACH to the SCS of the SS Block is equal to <NUM>, and T2 = T1* ratio = T1*<NUM>.

For example, for the time slots as shown in <FIG>, a duration of one time slot is <NUM>, the time slot includes <NUM> OFDM symbols, so the SCS of the SS Block for the downlink transmission is <NUM>. Two SS Blocks are respectively transmitted from symbol <NUM> to symbol <NUM> and from symbol <NUM> to symbol <NUM>. Two continuous OFDM symbols are reserved between the two SS Blocks, and two continuous OFDM symbols are also reserved at the end of the time slot. Therefore, the number T1 of remaining continuous OFDM symbols in the current time slot is equal to <NUM>.

If the SCS of the PRACH format configured by the base station is <NUM>, the number T2 of the remaining continuous OFDM symbols for uplink transmission is equal to T1*<NUM>=<NUM>.

If the number of the OFDM symbols included in the PRACH format configured by the base station for the terminal is not greater than <NUM>, the terminal may perform the random access in this time slot. If the number of the OFDM symbols included in the PRACH format configured by the base station for the terminal is greater than <NUM>, the terminal may not perform the random access in this time slot.

According to the embodiment of the present application, after it is determined that the terminal may perform the random access through the OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the terminal may perform the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols by using the following manners.

The terminal selects at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols, and the terminal performs the random access through the selected OFDM symbol.

Correspondingly, after it is determined that the base station may receive and detect the PRACH through the OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the base station may receive and detect the PRACH through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols by using the following manners.

The base station selects at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols, and the base station receives and detects the PRACH on the selected OFDM symbol.

The following describes, by several specific examples, the method that the terminal performs the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

For the time slots as shown in <FIG>, a duration of one time slot is <NUM>, the time slot includes <NUM> OFDM symbols. Two SS Blocks are respectively transmitted from symbol <NUM> to symbol <NUM> and from symbol <NUM> to symbol <NUM>. Two continuous OFDM symbols are reserved between the two SS Blocks, and two continuous OFDM symbols are also reserved at the end of the time slot. Therefore, the number T1 of remaining continuous OFDM symbols in the current time slot is equal to <NUM>.

Whether the time slot may be used for the random access is determined below.

The terminal calculates the number of the remaining continuous OFDM symbols for the uplink transmission, and compares the calculated number of the remaining continuous OFDM symbols for the uplink transmission with the number of the OFDM symbols actually used for the random access.

If the SCS of the SS Block and the SCS of the PRACH format are both equal to <NUM>, the ratio of the SCS of the PRACH to the SCS of the SS Block is equal to <NUM>, and the number of the remaining continuous OFDM symbols for the uplink transmission is T2=T1*ratio=<NUM>.

If the number of OFDM symbols of the PRACH format configured by the base station is not greater than <NUM>, the terminal may perform the random access in the time slot as shown in <FIG>. For example, the SCS of the PRACH is <NUM>, and the PRACH format is A0 or C0. A0 is taken as an example in <FIG>. The terminal reserves two continuous OFDM symbols for transmission of a random access preamble between two SS Blocks, or reserves two continuous OFDM symbols for transmission of the random access preamble at the end of the time slot. A fixed transmission start position is at a start position of the first OFDM symbol or at a fixed offset position, wherein offset is equal to <NUM> or T_ofdm/<NUM>, and T_ofdm represents the length of an OFDM symbol.

If the number of OFDM symbols of the PRACH format configured by the base station is not greater than <NUM>, the terminal may not transmit the random access preamble in the time slot as shown in <FIG>.

For the time slots as shown in <FIG>, a duration of one time slot is <NUM>, the SCS of the SS Block for the downlink transmission is <NUM>, and totally <NUM> OFDM symbols are included. Two SS Blocks are respectively transmitted from symbol <NUM> to symbol <NUM> and from symbol <NUM> to symbol <NUM>. Two continuous OFDM symbols are reserved between the two SS Blocks, and two continuous OFDM symbols are also reserved at the end of the time slot. Therefore, the number T1 of the remaining continuous OFDM symbols in the current time slot is equal to <NUM>.

As shown in <FIG>, if the SCS of the PRACH format configured by the base station for the terminal is equal to <NUM>, the ratio of the SCS of the PRACH format to the SCS of the SS Block is equal to <NUM>, the number of the remaining continuous OFDM symbols for the uplink transmission is T2=T1*ratio=<NUM>.

When the PRACH format configured by the base station is A0, A1, A2, B1, B2, C0, and C2, if the number of OFDM symbols included in the PRACH format is not greater than <NUM>, the terminal may perform the random access in the time slot as shown in <FIG>. For example, the PRACH format being A0, A1, and A2 is taken as an example. The terminal uses the manner as shown in <FIG> during the random access. the four remaining continuous OFDM symbols for the uplink transmission between the two SS Blocks of the terminal transmit the random access preamble, or the four remaining continuous OFDM symbols for the uplink transmission at the end of the time slot transmit the random access preamble, and the fixed transmission start position is a start position of the first OFDM symbol or at a fixed offset position, wherein offset is equal to <NUM> or T_ofdm/<NUM>, and T_ofdm represents the length of an OFDM symbol.

If the number of OFDM symbols of the PRACH format configured by the base station is not greater than <NUM>, the random access preamble may not be transmitted on the OFDM symbol of the time slot.

The terminal may use the following two manners when performing the random access with the manner of Case II.

Manner <NUM>, the terminal performs the random access on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

Manner <NUM>, the terminal performs the random access at a time slot which does not include the first type of OFDM symbols.

During the random access, the terminal may use any one of the above Manner <NUM> and Manner <NUM>.

Correspondingly, the base station may receive and detection the PRACH by using the following two manners.

The base station receives and detects the PRACH on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, or receives and detects the PRACH in the time slot which does not include the first type of OFDM symbols.

If the PRACH time domain resource configured by the base station for the terminal includes one time slot, as shown in <FIG>, the terminal determines the random access manner according to the following steps.

At Step <NUM>: the terminal determines whether the current time slot includes the first type of OFDM symbols; Step <NUM> is implemented if NO, and Step <NUM> is implemented if YES.

At Step <NUM>: the terminal performs the random access in the time slot.

At Step <NUM>: the terminal determines whether the number of the remaining continuous OFDM symbols for the uplink transmission except the first type of OFDM symbols in the current time slot is less than the number of the OFDM symbols actually used for random access; Step <NUM> is implemented if NO, and Step <NUM> is implemented if YES.

At Step <NUM>: the terminal performs the random access on the remaining continuous OFDM symbols for uplink transmission in the current time slot.

At Step <NUM>: the terminal does not perform the random access within the PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

Correspondingly, as shown in <FIG>, the base station determines the PRACH receiving and detection manner according to the following steps.

At Step <NUM>: the base station determines whether the current time slot includes the first type of OFDM symbols; Step <NUM> is implemented if NO, and Step <NUM> is implemented if YES.

At Step <NUM>: the base station receives and detects the PRACH in the time slot.

At Step <NUM>: the base station determines whether the number of the remaining continuous OFDM symbols for the uplink transmission except the first type of OFDM symbols in the current time slot is less than the number of the OFDM symbols actually used for random access; Step <NUM> is implemented if NO, and Step <NUM> is implemented if YES.

At Step <NUM>: the base station receives and detects the PRACH on the remaining continuous OFDM symbols for uplink transmission in the current time slot.

At Step <NUM>: the base station does not receive and detect the PRACH within the PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

If the PRACH time domain resource configured by the base station for the terminal includes a plurality of time slots, as shown in <FIG>, the terminal determines the random access manner according to the following steps.

At Step <NUM>: the terminal takes the next time slot in the plurality of time slots configured by the base station as the current time slot, and returns to Step <NUM>.

At Step <NUM>: if the plurality of time slots configured by the base station for the terminal do not satisfy the condition, the terminal does not perform the random access within the PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

It should be noted that when the PRACH time domain resource configured by the base station for the terminal includes the plurality of time slots, if it is determined that the current time slot does not include the first type of OFDM symbols, the terminal may also make a determination on the next time slot. When the next time slot includes the first type of OFDM symbols, the terminal performs the random access by using the OFDM symbols except the first type of OFDM symbols.

At Step <NUM>: the base station determines whether the number of remaining continuous OFDM symbols for the uplink transmission except the first type of OFDM symbols in the current time slot is less than the number of OFDM symbols actually used for random access; Step <NUM> is implemented if NO, and Step <NUM> is implemented if YES.

At Step <NUM>: the base station takes the next time slot in the plurality of time slots configured for the terminal as the current time slot, and returns to Step <NUM>.

At Step <NUM>: if the plurality of time slots configured by the base station for the terminal do not satisfy the condition, the base station does not receive and detect the PRACH within the PRACH transmission cycle within the PRACH transmission cycle, and waits for the next PRACH transmission cycle for determination again.

(The embodiment illustrated in <FIG> is not covered by the subject-matter of the claims. )As shown in <FIG>, a first terminal according to an embodiment of the present application includes: a processor <NUM>, a memory <NUM>, a transceiver <NUM>, and a bus interface.

The processor <NUM> is responsible for managing a bus architecture and performing usual processing, and the memory <NUM> may store data used when the processor <NUM> performs operations. The transceiver <NUM> is configured to receive and transmit data under the control of the processor <NUM>.

The bus architecture may include any number of interconnected buses and bridges to link various circuits of one or more processors represented by the processor <NUM> and memories represented by the memory <NUM> together specifically. The bus architecture may also link various other circuits such as peripherals, voltage regulators and power management circuits, which are well known in the art and, therefore, will not be further described herein. A bus interface provides an interface. The processor <NUM> is responsible for managing the bus architecture and performing usual processing, and the memory <NUM> may store data used when the processor <NUM> performs operations.

A flow disclosed by the embodiment of the present application may be applied to the processor <NUM>, or implemented by the processor <NUM>. In the implementation process, each step of a signal processing flow may be completed by integrated logic circuits of hardware in the processor <NUM> or instructions in the form of software. The processor <NUM> may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, and a discrete hardware component, and may implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiment of the present application may be directly embodied as being implemented by a hardware processor, or may be implemented and completed by a combination of hardware and software modules in the processor. The software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register. The storage medium is located in the memory <NUM>, and the processor <NUM> reads information in the memory <NUM> and completes the steps of the signal processing flow in combination with its hardware.

Specifically, the processor <NUM> is configured to read a program in the memory <NUM> and execute the following actions:
determining a Physical Random Access Channel (PRACH) time domain resource configured by a base station for a terminal, wherein the PRACH time domain resource includes at least one time slot; and when it is determined that the at least one time slot includes a first type of Orthogonal Frequency Division Multiplexing (OFDM) symbols used for transmitting SS Blocks and/or RMSI, performing random access through an OFDM symbol different from the first type of OFDM symbols in the at least one time slot.

Optionally, the processor <NUM> is specifically configured to:
perform the random access according to any one of the following manners.

Manner I, performing the random access at a time slot which does not include the first type of OFDM symbols.

Manner II, performing the random access through continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

Optionally, the processor <NUM> is further configured to:
before performing the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, determine that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

Optionally, the processor <NUM> is specifically configured to:
determine the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:
determining a ratio of a Subcarrier Spacing (SCS) of a PRACH configured by the base station to an SCS of an SS Block; and determining a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

Optionally, the processor <NUM> is specifically configured to:
select at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols; and perform the random access through the selected OFDM symbol.

(The embodiment illustrated in <FIG> is not covered by the subject-matter of the claims. )As shown in <FIG>, a base station according to an embodiment of the present application includes: a processor <NUM>, a memory <NUM>, a transceiver <NUM>, and a bus interface.

Specifically, the processor <NUM> is configured to read a program in the memory <NUM> and execute the following actions:
configuring a Physical Random Access Channel (PRACH) time domain resource for a terminal, wherein the PRACH time domain resource includes at least one time slot; and when it is determined that the at least one time slot includes a first type of Orthogonal Frequency Division Multiplexing (OFDM) symbols used for transmitting SS Blocks and/or RMSI, receiving and detecting the PRACH on an OFDM symbol different from the first type of OFDM symbols in the at least one time slot.

Optionally, the processor <NUM> is specifically configured to:
receive and detect the PRACH according to any one of the following manners.

Manner I, receiving and detecting the PRACH at a time slot which does not include the first type of OFDM symbols.

Manner II, receiving and detecting the PRACH on continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols.

Optionally, the processor <NUM> is further configured to:
before receiving and detecting the PRACH on OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, determine that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

Optionally, the processor <NUM> is specifically configured to:
determine the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:
determining a ratio of a Subcarrier Spacing (SCS) of a PRACH configured by the base station to an SCS of an SS Block, and determining a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

Optionally, the processor <NUM> is specifically configured to:
select at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols; and receive and detect the PRACH on the selected OFDM symbol.

As shown in <FIG>, a first random access device according to an embodiment of the present application includes:.

In the invention, the transmitting module <NUM> is specifically configured to:
perform the random access according to any one of the following manners.

Manner I, performing the random access at a time slot which does not include the first type of OFDM symbols. The Manner I is not covered by the subject-matter of the claims.

Optionally, the transmitting module <NUM> is configured to:
determine a random access manner according to the following manners:.

In the invention, the transmitting module <NUM> is further configured to:
before performing the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, determine that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

In the invention, the transmitting module <NUM> is specifically configured to:
determine the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:
determining a ratio of a Subcarrier Spacing (SCS) of a PRACH configured by the base station to an SCS of an SS Block; and determining a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

Optionally, the transmitting module <NUM> is specifically configured to:
select at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols; and perform the random access through the selected OFDM symbol.

As shown in <FIG>, a second random access device according to an embodiment of the present application includes:.

In the invention, the receiving module <NUM> is specifically configured to:
receive and detect the PRACH according to any one of the following manners.

Manner I, receiving and detecting the PRACH at a time slot which does not include the first type of OFDM symbols. The Manner I is not covered by the subject-matter of the claims.

In the invention, the receiving module <NUM> is further configured to:
before receiving and detecting the PRACH on OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, determine that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

In the invention, the receiving module <NUM> is specifically configured to:
determine the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:
determining a ratio of a Subcarrier Spacing (SCS) of a PRACH configured by the base station to an SCS of an SS Block, and determining a product of the number of remaining continuous OFDM symbols in the time slot including the first type of OFDM symbols and the ratio as the number of the remaining continuous OFDM symbols for uplink transmission.

Optionally, the receiving module <NUM> is specifically configured to:
select at least one idle OFDM symbol between the first type of OFDM symbols from the time slot including the first type of OFDM symbols, or at least one idle OFDM symbol at the end of the time slot including the first type of OFDM symbols; and receive and detect the PRACH on the selected OFDM symbol.

Based on the same inventive concept, an embodiment of the present application further provides a random access method. Since a device corresponding to the method is the terminal in the random access system according to the embodiment of the present application, and the principle of the method for solving the problem is similar to that of the device, the implementation of this method may refer to the implementation of the device, and the repetitions will not be described here.

A computer storage medium according to an embodiment of the present application stores a computer program. The program, when executed by a processor, implements the steps implemented by the terminal of the embodiment of the present application, or the steps implemented by the base station of the embodiment of the present application.

As shown in <FIG>, a first random access method according to an embodiment of the present application includes:.

In the invention, the terminal performs the random access according to any one of the following manners.

Manner I, the terminal performs the random access at a time slot which does not include the first type of OFDM symbols. The Manner I is not covered by the subject-matter of the claims.

Optionally, the terminal determines a random access manner according to the following manners:.

In the invention, before the terminal performs the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the random access method further includes:
the terminal determines that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

In the invention, the terminal determines the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:.

Optionally, the manner that the terminal performs the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols includes:.

Based on the same inventive concept, an embodiment of the present application further provides a random access method. Since a device corresponding to the method is the base station in the random access system according to the embodiment of the present application, and the principle of the method for solving the problem is similar to that of the device, the implementation of this method may refer to the implementation of the device, and the repetitions will not be described here.

As shown in <FIG>, a second random access method according to an embodiment of the present application includes:.

In the invention, the base station receives and detects the PRACH according to any one of the following manners:.

In the invention, before the base station receives and detects the PRACH on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols, the random access method further includes:
the base station determines that in the time slot including the first type of OFDM symbols, the number of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than the number of actually used OFDM symbols for the random access.

In the invention, the base station determines the number of the remaining continuous OFDM symbols for uplink transmission according to the following manners:.

Optionally, the manner that the base station receives and detects the PRACH on the continuous OFDM symbols except the first type of OFDM symbols in the time slot including the first type of OFDM symbols includes:.

The present application is described above with reference to block diagrams and/or flow charts illustrating methods, apparatuses (systems) and/or computer program products according to the embodiments of the present application. It should be understood that one block of the block diagram and/or flow chart illustration and a combination of blocks of the block diagram and/or flow chart illustration can be implemented by computer program instructions. These computer program instructions may be provided to a general-purpose computer, a processor of a special-purpose computer, and/or other programmable data processing apparatuses to produce a machine such that the instructions executed via the computer processor and/or other programmable data processing apparatuses are created for a method configured to implement the functions/actions specified in the blocks of the block diagram and/or flow chart.

Claim 1:
A random access method, comprising:
determining, by a terminal, a Physical Random Access Channel, PRACH, time domain resource configured by a base station for the terminal, wherein the PRACH time domain resource comprises at least one time slot; and
characterized in that, the method further comprises:
when it is determined that the at least one time slot comprises a first type of Orthogonal Frequency Division Multiplexing, OFDM, symbols used for transmitting Synchronization Signal Blocks, SS Blocks, performing, by the terminal, random access through an OFDM symbol different from the first type of OFDM symbols in the at least one time slot;
wherein the performing, by the terminal, random access comprises: performing, by the terminal, the random access through continuous OFDM symbols except the first type of OFDM symbols in the time slot comprising the first type of OFDM symbols;
wherein before performing, by the terminal, the random access through the continuous OFDM symbols except the first type of OFDM symbols in the time slot comprising the first type of OFDM symbols, the method further comprises:
determining, by the terminal, that in the time slot comprising the first type of OFDM symbols, a quantity of remaining continuous OFDM symbols for uplink transmission except the first type of OFDM symbols is not less than a quantity of actually used OFDM symbols for the random access;
wherein the terminal determines the quantity of the remaining continuous OFDM symbols for uplink transmission according to followings:
determining, by the terminal, a ratio of a Subcarrier Spacing, SCS, of the PRACH configured by the base station to an SCS of an SS Block; and
determining, by the terminal, a product of the quantity of remaining continuous OFDM symbols in the time slot comprising the first type of OFDM symbols and the ratio as the quantity of the remaining continuous OFDM symbols for uplink transmission.