CN110035536B

CN110035536B - Method for determining time-frequency resource, configuration method and equipment

Info

Publication number: CN110035536B
Application number: CN201810725168.7A
Authority: CN
Inventors: 熊琦; 钱辰; 喻斌
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2018-01-11
Filing date: 2018-07-04
Publication date: 2024-04-09
Anticipated expiration: 2038-07-04
Also published as: CN110035536A

Abstract

The invention provides a method for determining time-frequency resources, which comprises the following steps: the terminal receives first resource configuration information sent by a base station; the terminal determines the time-frequency resource according to the second resource configuration information configured by the default or the base station and the offset configuration information in the first resource configuration information; and the terminal performs data transmission on the time-frequency resource. The method provided by the invention can more effectively determine the time-frequency resources of the random access response, the random access message 3 and the conflict resolution message, avoid the possible resource collision condition and improve the performance of the system.

Description

Method for determining time-frequency resource, configuration method and equipment

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method for determining a time-frequency resource, a configuration method and a device.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT, internet of things), the future mobile communication technology is challenged unprecedented. As per the international telecommunications union ITU report ITU-R M [ imt. Beyond 2020.Traffic ], it is expected that in 2020, mobile traffic will increase approximately 1000 times as compared to 2010 (4G age), the number of user equipment connections will also exceed 170 billions, and the number of connected devices will be even more dramatic as the vast number of IoT devices gradually penetrate into the mobile communication network. To address this unprecedented challenge, the communications industry and academia have developed a wide range of fifth generation mobile communication technology research (5G), oriented in the 2020 s. The framework and overall goals of future 5G have been discussed in ITU report ITU-R M [ imt.vision ], where the requirements expectations, application scenarios and important performance metrics of 5G are specified. For new demands in 5G, ITU report ITU-R M [ imt.future TECHNOLOGY TRENDS ] provides information about technical trends for 5G, aiming at solving significant problems of significant improvement of system throughput, user experience consistency, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support of emerging services, flexible spectrum utilization, etc.

The transmission in the wireless communication system includes: a transmission from a base station (gNB) to a User Equipment (UE) is referred to as a downlink transmission, a corresponding time slot is referred to as a downlink time slot, a transmission from a UE to a base station is referred to as an uplink transmission, and a corresponding time slot is referred to as an uplink time slot.

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, synchronization signal/PBCH block), which is a synchronization signal block period (SSB period), or referred to as a synchronization signal block group period (SSB burst periodicity). Meanwhile, the base station configures a random access configuration period (Physical random access channel configuration period, PRACH configuration period) in which a certain number of random access transmission opportunities (PRACH transmission occasion, ROs) are configured, and it is satisfied that all SSBs can be mapped to corresponding ROs in a mapping period (mapping period or association period) (a certain time length).

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

The contention-based random access procedure in LTE-a is divided into four steps as shown in fig. 1. In the first step, the user randomly selects a preamble sequence from the preamble sequence resource pool and sends the preamble sequence to the base station. The base station carries out correlation detection on the received signals so as to identify a preamble sequence sent by a user; in the second step, the base station transmits a random access response (Random Access Response, RAR) to the user, including a random access preamble sequence identifier, a timing advance instruction determined according to the time delay estimation between the user and the base station, a temporary Cell radio network temporary identifier (Cell-Radio Network Temporary Identifier, C-RNTI), and a time-frequency resource allocated for the next uplink transmission of the user; in a third step, the user sends a third message (Msg 3) to the base station based on the information in the RAR. The Msg3 contains information such as a user terminal identifier, an RRC (radio resource control) link request and the like, wherein the user terminal identifier is unique to a user and is used for resolving conflicts; in the fourth step, the base station sends conflict resolution identification to the user, including the user terminal identification of the user winning in the conflict resolution. After detecting the self-contained identification, the user upgrades the temporary C-RNTI into the C-RNTI, sends an ACK signal to the base station, completes the random access process, and waits for the scheduling of the base station. Otherwise, the user will start a new random access procedure after a delay.

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

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

initial access under rrc_idle;

2. reestablishing the RRC connection;

3. cell switching;

the RRC connection state downlink data arrives and requests a random access procedure (when the uplink is asynchronous);

the RRC connection state downlink and uplink data arrives and requests a random access process (when the uplink is asynchronous or the resource is not allocated to the scheduling request in the PUCCH resource);

6. and (5) positioning.

In LTE, the six scenarios described above use the same random access procedure. When a base station transmits scheduling downlink or uplink permission to a UE in a new system design, the UE obtains downlink control information of scheduling random access response on a current control channel, and the obtained downlink control information contains time-frequency position configuration information of scheduled downlink or uplink resources, wherein the configuration information is indicated based on all possible time-frequency position configurations of system configuration acquired by the UE. However, for the initially accessed user, not all possible time-frequency location configurations of the system configuration are acquired, so that a default configuration is required at least for sending the system information, but for the random access user, if the random access response or the conflict resolution message is to be received, the size of the frequency domain resource is limited, and the random access response message or the conflict resolution message may conflict with the system message, so how to configure and determine the response message in the random access is a problem to be solved.

Disclosure of Invention

The invention aims at: the method overcomes the defects of the prior art and provides a time-frequency resource determining mode and a configuration mode.

In order to achieve the above object, the present invention provides a method for determining and configuring time-frequency resources, which includes the following steps:

the terminal receives first resource configuration information sent by a base station;

the terminal determines the time-frequency resource according to the second resource configuration information configured by the default or the base station and the offset configuration information in the first resource configuration information;

and the terminal performs data transmission on the time-frequency resource.

Preferably, the second resource configuration information at least includes one or more of the following:

the downlink time frequency resource configuration information of the transmission system information or the minimum residual system information is configured through the downlink control information;

uplink time-frequency resource configuration information indicated by uplink authorization of the message 3 configured by random access response;

time-frequency resource allocation information for receiving random access response is allocated through downlink control information.

The first resource configuration information at least comprises one or more of the following:

the method comprises the steps of configuring downlink control information for receiving random access response;

the method comprises the steps of configuring uplink authorization information in a random access response for first sending a message 3;

The downlink control information is used for configuring retransmission of the sending message 3;

for configuring downlink control information for receiving the collision resolution message.

Preferably, determining the time-frequency resource according to the second resource configuration information configured by the default or the base station and the offset configuration information in the first resource configuration information includes:

the terminal determines time domain resources according to the time domain resource configuration information in the second resource configuration information and the time domain offset configuration information in the offset configuration information;

and the terminal determines the frequency domain resource according to the frequency domain resource configuration information in the second resource allocation information and the frequency domain offset configuration information in the offset configuration information.

Preferably, determining the time domain resource comprises the steps of:

determining the time slot index of the resource according to the time slot offset in the second resource configuration information and the time slot offset in the offset configuration information;

determining a starting symbol index of the resource according to the starting symbol index in the second resource configuration information and the starting symbol offset in the offset configuration information;

the number of continuous symbols in the second resource configuration information is offset from the number of continuous symbols in the offset configuration information, and the number of continuous symbols of the resource is determined;

And determining the time domain resource of the time-frequency resource according to the time slot value, the initial symbol index and the continuous symbol number, wherein at least one of the time slot value, the initial symbol index and the continuous symbol number is information in the second resource configuration information, and/or at least one of the time slot value, the initial symbol index and the continuous symbol number is preset configuration.

Preferably, determining the frequency domain resource comprises the steps of:

determining a starting physical resource block index of the resource according to the starting physical resource block index in the second resource configuration information and the starting physical resource block index offset information in the offset configuration information;

the number of the continuous physical resource blocks in the second resource configuration information is offset from the continuous physical resource blocks in the offset configuration information, and the number of the continuous physical resource blocks of the resources is determined;

and determining the frequency domain resource of the time-frequency resource according to the initial physical resource block index and the number of continuous physical resource blocks, wherein at least one of the initial physical resource block index and the number of continuous physical resource blocks is information in the second resource configuration information, and/or at least one of the initial physical resource block index and the number of continuous physical resource blocks is preset configuration.

Preferably, the time domain offset configuration information includes at least one of: a start symbol index offset, a slot index offset, and a consecutive symbol number offset; the frequency domain offset configuration information includes at least one of: a starting physical resource block index offset and a consecutive physical resource block offset.

Preferably, the time domain offset configuration information is notified by one of:

an index indicating a predetermined one of the offset configuration combinations;

index combinations respectively indicating different offsets;

wherein the offset configuration combination comprises at least one of a start symbol index offset, a slot index offset, and a consecutive symbol number offset; the index combinations indicating different offsets include indexes of at least one of a start symbol index offset, a slot index offset, and a consecutive symbol number offset.

index combinations respectively indicating different offsets;

wherein the offset configuration combination comprises at least one of a starting physical resource block index offset and a continuous physical resource block offset; the index combination indicating different offsets includes an index of at least one of a starting physical resource block index offset, a consecutive physical resource block offset.

The invention also provides a method for determining the time-frequency resource of the random access channel, which comprises the following steps:

the terminal determines a random access channel time-frequency resource and a preamble sequence according to the downlink control information;

the terminal transmits the preamble sequence on the random access channel time-frequency resource.

Preferably, the downlink control information includes at least one or more of the following information:

the index number of the downlink transmission wave beams;

random access configuration information for each downlink beam index.

Preferably, the random access configuration information for each downlink beam index includes at least one or several of the following information:

downlink transmit beam index;

random access preamble index;

random access preamble time-frequency resource index.

The invention also provides a method for determining the random access resource of the target cell, which comprises the following steps:

the terminal receives configuration information of a target cell;

determining the mapping pattern period from SSB to RO of the target cell according to the configuration information;

when the determined mapping pattern period is not equal to or greater than a preset time length of X milliseconds, the terminal determines that the absolute time offset of the ith radio frame of the current cell and the ith radio frame of the target cell is not greater than Y;

And determining the random access resource of the target cell.

Preferably, X may be 10, and/or Y may be 5 milliseconds;

determining random access resources of the target cell includes: the terminal determines the wireless frame number of the target cell according to the wireless frame number of the current cell, and determines the mapping from the SSB to the RO and the positions of the SSB and the RO according to the configuration information of the target cell and the wireless frame number of the target cell.

The invention also provides a device for determining the random access resource of the target cell, which comprises the following modules:

the configuration information receiving module is used for receiving the configuration information of the target cell by the terminal;

the mapping pattern period determining module is used for determining the mapping pattern period from the SSB to the RO of the target cell according to the configuration information by the terminal;

a radio frame determining module of the target cell, configured to determine that an absolute time offset between an i-th radio frame of the current cell and an i-th radio frame of the target cell is not greater than Y, i.e., the terminal determines a radio frame number of the target cell, when the determined mapping pattern period is not equal to or greater than a preset time length X ms;

and the target cell random access resource determining module is used for determining the mapping from the SSB to the RO and the positions of the SSB and the RO according to the configuration information of the target cell and the wireless frame number of the target cell by the terminal.

The invention also provides a method for determining whether the random access contention resolution is successful, which comprises the following steps:

the terminal sends a random access message III, wherein the message III comprises a C-RNTI distributed by a base station;

the terminal searches possible downlink control channels;

when the terminal detects a downlink control channel and the detected downlink control channel meets the following conditions, the terminal determines whether random access contention resolution is successful: the downlink control channel is marked by the C-RNTI, the detected downlink control channel comprises an uplink grant for new transmission, and the detected downlink control channel carries indication information for indicating that the uplink grant is used for random access contention resolution information.

Preferably, the indication information for indicating that the uplink grant is for a random access contention resolution message is: and taking the value as the HARQ process index of a preset value.

Preferably, the preset value may be 1.

The invention also provides a device for determining whether the random access contention resolution is successful, which comprises the following modules:

a random access message three sending module, configured to send a random access message three;

the downlink control channel searching module is used for searching and detecting possible downlink control channels;

The random access contention resolution determining module is configured to determine whether random access contention resolution is resolved according to whether a detected downlink control channel is marked by the C-RNTI, whether the detected downlink control channel includes an uplink grant for new transmission, and whether the detected downlink control channel carries indication information for indicating that the uplink grant is for a random access contention resolution message.

The invention also provides a device for determining the time-frequency resource, which comprises the following modules:

the resource configuration receiving module is used for receiving first configuration information sent by the base station;

the time-frequency resource determining module is used for determining time-frequency resources according to second configuration information configured by a default or base station and offset configuration information in the first configuration information;

and the data transmitting module is used for transmitting data on the time-frequency resource.

The invention also provides a device for determining the time-frequency resource of the random access channel, which comprises the following modules:

the random access information configuration module is used for configuring random access channel time-frequency resources and random access lead codes according to the downlink control information by the terminal;

and the preamble sending module is used for sending the preamble on the random access time-frequency resource by the terminal.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a conventional contention-based random access procedure;

FIG. 2 is a flow chart of a method for determining time-frequency resources;

fig. 3 is a diagram illustrating an example of a method for determining a time domain position of a PDSCH in response to random access;

fig. 4 is a diagram of a time domain priority example of a random access opportunity index;

fig. 5 is a device for determining time-frequency resources according to the present invention;

fig. 6 is a schematic diagram of an apparatus for determining a time-frequency resource of a random access channel according to the present invention;

fig. 7 is an exemplary diagram of SSB and RO mapping.

Detailed Description

In order to make the present embodiment better understood by those skilled in the art, the technical solution in the present embodiment will be clearly and completely described in the following with reference to the accompanying drawings in the embodiment of the present embodiment.

In the present description and in the claims and in the above description of the figures, a number of operations are included that appear in a particular order, but it should be clearly understood that the operations may be performed out of order or performed in parallel in the order in which they appear, the sequence numbers of the operations such as 101, 102, etc. are merely used to distinguish between the various operations, and the sequence numbers themselves do not represent any order of execution. In addition, the flows may include more or fewer operations, and the operations may be performed sequentially or in parallel. It should be noted that, the descriptions of "first" and "second" herein are used to distinguish different messages, devices, modules, etc., and do not represent a sequence, and are not limited to the "first" and the "second" being different types.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other examples, which a person skilled in the art would obtain without making any inventive effort, based on the examples in this detailed description are within the scope of the protection of this detailed description.

Fig. 2 is a flowchart of a method for determining a time-frequency resource, including: the terminal receives first resource configuration information sent by a base station; the terminal determines the time-frequency resource according to the second resource configuration information configured by the default or the base station and the offset configuration information in the first resource configuration information; and the terminal performs data transmission on the time-frequency resource.

In the present invention:

a time domain unit refers to one OFDM symbol, a combination of a plurality of OFDM symbols, a half slot, a combination of a plurality of slots, a subframe, a combination of a plurality of subframes, a system frame, a combination of a plurality of system frames, or a predefined absolute time, such as X milliseconds, etc.

The frequency domain unit refers to one subcarrier, a combination of a plurality of subcarriers, a half physical resource block (physical resource block, PRB), one PRB, a combination of a plurality of PRBs, or a predefined absolute frequency domain width, such as X hertz, etc.

In other parts of the present invention, OFDM symbols and slots are taken as examples of time units; examples of frequency domain units are PRBs.

The number of consecutive OFDM symbols in the present invention has the same meaning as the number of occupied OFDM symbols or the number of occupied OFDM symbols.

In the present invention, the number of consecutive PRBs has the same meaning as the number of occupied PRBs or the number of occupied PRBs.

Example 1

The present invention provides a method for determining and configuring time-frequency resources, which is described below by taking PDSCH time-frequency resources for determining random access response as an example.

When the UE initially accesses the network, the time-frequency resource position of the PDSCH carrying the system message is obtained through the read scheduling information of the downlink control channel, wherein one case is that the DCI indicates the frequency domain starting position of the system information PDSCH and the number of frequency domain units occupied by the frequency domain, and according to the default time domain configuration or the time domain configuration selection indicated in the DCI, the UE can exactly obtain the time-frequency resource position of the PDSCH carrying the system message, that is, the UE can determine continuous t_si_symbol_duration OFDM symbols from the t_si_symbol in the time slot of k0_si after the time when the DCI is received. For example: the DCI indicates that the frequency domain start position of the system information PDSCH starts from the third PRB, i.e., f_si_prb_start=3, and continuously occupies 6 PRBs, i.e., f_si_prb_duration=6; meanwhile, if the nth time slot is in the time domain where the DCI is received, according to the default time domain configuration, the UE can find that the PDSCH of the DCI scheduled bearer system message is in the n+3rd time slot (i.e., k0_si=3) in the time domain, where the 3 rd OFDM symbol is 3 consecutive OFDM symbols (i.e., t_si_symbol_duration=3) of the OFDM start symbol (i.e., t_si_symbol_start=3).

The UE reads the system information, acquires the random access resource configuration, starts the random access flow, and searches possible random access response DCI in the random access response search window (RAR window) according to the configured random access response search window after the UE transmits the random access preamble.

In the random access response DCI, the UE may read the PDSCH time domain resource configuration, i.e., time domain PDSCH resource, and/or the PDSCH frequency domain resource configuration, frequency domain PDSCH resource.

For an RAR PDSCH time domain resource configuration of X bits, then there may be:

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, PDSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, where the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_rar_symbol_duration=t_si_symbol_duration; the following representation contains all 3 offsets. For example, when the PDSCH time domain resource allocation has a value of 1, which represents a time domain offset allocation using a configuration index value of 1, the UE may obtain k0_rar=k0_si+0=3, t_rar_symbol_start=t_si_symbol_start+3=6, and t_rar_symbol_duration=t_si_symbol_duration+1=4. That is, the PDSCH corresponding to the RAR is described as 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the n+3 slot; as shown in fig. 3.

Table 1-time domain offset configuration example table one (x=2)

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_si_symbol_duration, as shown in table two. At this time, when the value of PDSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_rar_symbol_start=t_si_symbol_start+1 t_si_symbol_duration=3+3=6.

Table 2-time domain offset configuration example table two (x=2)

2. At least slot offset, starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, are indicated by segment bits in the X bits, respectively, such as: the upper 2 bits of x=4 bits are used to indicate the slot offset, and the lower 2 bits are used to indicate the starting OFDM symbol offset; wherein, for example, the upper 2 bits may be used to represent a specific value of the slot offset, i.e., 2 bits may represent 0,1,2,3, i.e., 0 slot offset, 1 slot offset, 2 slot offset, 3 slot offset; or 2 bits may represent an index indicating four values of the slot offset configuration possible, as shown in the example of table 3.

TABLE 3 slot offset configuration example one (high order 2 bits)

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

● An absolute value indicating the number of starting OFDM symbol offsets, e.g. 2 bits, indicating [0,3,6,9] four possible configuration values, representing 0 starting OFDM symbol offsets, 3 starting OFDM symbol offsets, 6 starting OFDM symbol offsets, 9 starting OFDM symbol offsets;

● Or may be a multiple indicating that the starting OFDM symbol offset is based on t_si_symbol_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and t_si_symbol_duration=3; representing 0*3 =0 start OFDM symbol offsets, 1*3 =3 start OFDM symbol offsets, 2*3 =6 start OFDM symbol offsets, 3*3 =9 start OFDM symbol offsets.

3. The possible combinations of predefined time domain configurations are indicated directly by the X bits. For example x=2 bits, indicating the possible 4 time domain configuration combinations, as exemplified in table 4. When the value of PDSCH time domain resource allocation is 1, this represents: k0_rar=1, t_rar_symbol_start=6, t_rar_symbol_duration=2. The PDSCH illustrating the random access response is the consecutive 2 OFDM symbols starting from the 6 th OFDM symbol on slot n+1.

Table 4-time domain configuration example table one (x=2)

For the configuration of the RAR PDSCH frequency domain resources to Y bits, then there may be:

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PDSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offsets and occupied PRB number offsets, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, namely, the item does not have an offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, and the occupied PR8B number offset is indicated to be 0, namely, no offset exists, and F_RAR_PRB_duration=F_SI_PRB_duration; the example as in table 5 contains all 2 offsets. For example, when the PDSCH frequency domain resource allocation has a value of 1, which represents a frequency domain offset allocation using a configuration index value of 1, the UE may obtain f_rar_prb_start=f_si_prb_start+3=6, and f_rar_prb_duration=f_si_prb_duration-3=3. That is, the PDSCH corresponding to the RAR is described as 3 consecutive PRBs starting from the 6 th PRB.

Table 5-example of frequency domain offset configuration table one (y=2)

Specifically, the offset of the starting PRB may represent a multiple of f_si_prb_duration, as shown in table 6. At this time, when the value of PDSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_rar_prb_start=f_si_prb_start+1×f_si_prb_duration=3+1×3=6.

Table 6-frequency domain offset configuration example table two (y=2)

2. At least the starting PRB offset is indicated by segment bits in the Y bits, respectively, one or more of the number of occupied PRBs offsets, for example: the upper 2 bits of x=4 bits are used to indicate the number of occupied PRBs offset, and the lower 2 bits are used to indicate the starting PRB offset; wherein, for example, the high 2 bits can be used to represent a specific value of the number of occupied PRBs offset, namely, 2 bits can represent 0,1,2,3, namely, 0 number of PRBs offset, 1 PRB offset, 2 PRB offset, 3 PRB offset; or 2 bits may represent an index indicating four values of the number of occupied PRBs offset configuration possible, as shown in the example of table 7.

TABLE 7 slot offset configuration example one (high order 2 bits)

Configuring index values	Offset of number of occupied PRBs
		0	-1
1	0
		2	1
3	2

Specifically, for the bits indicating the starting PRB offset, it may be:

● An absolute value indicating the number of starting PRB offsets, e.g. 2 bits, indicating [0,3,6,9] four possible configuration values, representing that the starting PRB offset has 0 PRB offset, 3 PRB offset, 6 PRB offset, 9 PRB offset;

● Or may be a multiple indicating that the starting PRB offset is based on f_si_prb_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and f_si_prb_duration=3; representing the starting PRB offset 0*3 =0 PRB offsets, 1*3 =3 PRB offsets, 2*3 =6 PRB offsets, 3*3 =9 PRB offsets.

3. The possible combinations of predefined frequency domain configurations are indicated directly by the Y bits. For example y=2 bits, indicating possible 4-medium frequency configuration combinations, as exemplified in table 8. If the value of PDSCH frequency domain resource allocation is 1, this represents: f_rar_prb_start=6, f_rar_prb_duration=2. The PDSCH illustrating the random access response is the consecutive 2 PRBs starting at the 6 th PRB.

Table 8-example of frequency domain configuration table one (y=2)

Example two

The present invention provides a method for determining and configuring time-frequency resources, which is described below by taking PDSCH time-frequency resources for determining a random access collision resolution message (random access contention resolution, RACR) as an example.

The UE reads the system information, acquires the random access resource configuration, starts the random access flow, searches for possible random access response in the random access resource configuration according to a configured random access response search window (RAR window) after the UE transmits the random access preamble, acquires the correct random access response, and prepares to receive the random access conflict resolution message DCI after transmitting the message III.

In the random access collision resolution message DCI, the UE may read the random access collision resolution message PDSCH time domain resource configuration, i.e. time domain PDSCH resource, and/or the random access collision resolution message PDSCH frequency domain resource configuration, frequency domain PDSCH resource.

For the random access collision resolution message PDSCH time domain resources configured to be X bits, there may be:

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, PDSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, where the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_racr_symbol_duration=t_si_symbol_duration; the following representation contains all 3 offsets. For example, when the PDSCH time domain resource allocation has a value of 1, which represents that a time domain offset allocation with a configuration index value of 1 is used, the UE may obtain k0_racr=k0_si+0=3, t_racr_symbol_start=t_si_symbol_start+3=6, and t_racr_symbol_duration=t_si_symbol_duration+1=4. That is, it is illustrated that PDSCH corresponding to the random access collision resolution message (random accesscontention resolution, RACR) is 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_si_symbol_duration, as shown in table two. At this time, when the value of PDSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_racr_symbol_start=t_si_symbol_start+1 t_si_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

3. The possible combinations of predefined time domain configurations are indicated directly by the X bits. For example x=2 bits, indicating the possible 4 time domain configuration combinations, as exemplified in table 4. When the value of PDSCH time domain resource allocation is 1, this represents: k0_racr=1, t_racr_symbol_start=6, t_racr_symbol_duration=2. The PDSCH of RACR is illustrated as the consecutive 2 OFDM symbols starting with the 6 th OFDM symbol on slot n+1.

For a RACR PDSCH frequency domain resource configuration of Y bits, then there may be:

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PDSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, that is, the item has no offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, that is, the occupied PRB number offset is indicated to be 0, that is, no offset is indicated, and F_RACR_PRB_duration=F_SI_PRB_duration; the example as in table 1 contains all 2 offsets. For example, when the PDSCH frequency domain resource allocation has a value of 1, which represents a frequency domain offset allocation using a configuration index value of 1, the UE may obtain f_racr_prb_start=f_si_prb_start+3=6, and f_racr_prb_duration=f_si_prb_duration-3=3. That is, the PDSCH corresponding to RACR is described as 3 consecutive PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_si_prb_duration, as shown in table 6. At this time, when the value of PDSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_racr_prb_start=f_si_prb_start+1×f_si_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

3. The possible combinations of predefined frequency domain configurations are indicated directly by the Y bits. For example y=2 bits, indicating possible 4-medium frequency configuration combinations, as exemplified in table 8. If the value of PDSCH frequency domain resource allocation is 1, this represents: f_racr_prb_start=6, f_racr_prb_duration=2. The PDSCH of RACR is illustrated as a succession of 2 PRBs starting at the 6 th PRB.

Example III

The present invention provides a method for determining and configuring time-frequency resources, which is described below by taking another PDSCH time-frequency resource for determining a random access collision resolution message as an example.

After the UE reads the system information, obtains the random access resource configuration, starts the random access procedure, searches for a possible random access response in the random access resource configuration according to a configured random access response search window (RAR window) after the UE sends the random access preamble, and obtains the time-frequency resource position of the PDSCH carrying the RAR, that is, the UE can determine consecutive t_rar_symbol_duration OFDM symbols from the t_rar_symbol_start OFDM symbol in a time slot of k0_rar after the time when the UE receives the DCI in the time domain. For example: the DCI indicates that the frequency domain starting position of the rarpdsch starts from the third PRB, i.e., f_rar_prb_start=3, and occupies 6 PRBs consecutively, i.e., f_rar_prb_duration=6; meanwhile, if the nth slot is in the time domain where the DCI is received, according to a default time domain configuration, the UE can find that the PDSCH carrying the RAR scheduled by the DCI is in the n+3rd slot (k0_rar=3) in the time domain, where the 3 rd OFDM symbol is the consecutive 3 OFDM symbols (i.e. t_rar_symbol_duration=3) of the OFDM start symbol (i.e. t_rar_symbol_start=3).

The UE gets the correct random access response, and after sending the third message, the UE prepares to receive the random access collision resolution message DCI.

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, PDSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, where the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_racr_symbol_duration=t_rar_symbol_duration; the following representation contains all 3 offsets. For example, when the PDSCH time domain resource allocation has a value of 1, which represents a time domain offset allocation using a configuration index value of 1, the UE may obtain k0_racr=k0_rar+0=3, t_racr_symbol_start=t_rar_symbol_start+3=6, and t_racr_symbol_duration=t_rar_symbol_duration+1=4. That is, it is illustrated that PDSCH corresponding to the random access collision resolution message (randomaccess contention resolution, RACR) is 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_rar_symbol_duration, as shown in table two. At this time, when the value of PDSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_racr_symbol_start=t_rar_symbol_start+1 t_rar_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

● Or may be a multiple indicating that the starting OFDM symbol offset is based on t_rar_symbol_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and t_rar_symbol_duration=3; representing 0*3 =0 start OFDM symbol offsets, 1*3 =3 start OFDM symbol offsets, 2*3 =6 start OFDM symbol offsets, 3*3 =9 start OFDM symbol offsets.

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PDSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, that is, the item has no offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, that is, the occupied PRB number offset is indicated to be 0, that is, no offset is indicated, and F_RAR_PRB_duration=F_RAR_PRB_duration; the example as in table 1 contains all 2 offsets. For example, when the PDSCH frequency domain resource allocation has a value of 1, which represents a frequency domain offset allocation using a configuration index value of 1, the UE may obtain f_racr_prb_start=f_rar_prb_start+3=6, and f_racr_prb_duration=f_rar_prb_duration-3=3. That is, the PDSCH corresponding to RACR is described as 3 consecutive PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_rar_prb_duration, as shown in table 6. At this time, when the value of PDSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_racr_prb_start=f_rar_prb_start+1×f_rar_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

● It may also be a multiple indicating that the starting PRB offset is based on f_rar_prb_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and f_rar_prb_duration=3; representing the starting PRB offset 0*3 =0 PRB offsets, 1*3 =3 PRB offsets, 2*3 =6 PRB offsets, 3*3 =9 PRB offsets.

The possible combinations of predefined frequency domain configurations are indicated directly by the Y bits. For example y=2 bits, indicating possible 4-medium frequency configuration combinations, as exemplified in table 8. If the value of PDSCH frequency domain resource allocation is 1, this represents: f_racr_prb_start=6, f_racr_prb_duration=2. The PDSCH of RACR is illustrated as a succession of 2 PRBs starting at the 6 th PRB.

Example IV

The following describes a method for determining and configuring a PUSCH time-frequency resource of a random access message 3.

The UE obtains a correct random access response, and the UE may obtain an uplink grant for transmitting the first message 3 in the obtained random access response, or the UE may obtain a UL grant for retransmitting the scheduling message 3 in the DCI, which indicates the time-frequency resource location of the PUSCH of msg3, i.e. time domain PUSCH resource, and/or PUSCH frequency domain resource configuration, frequency domain PUSCH resource.

For the MSG3PUSCH time domain resource configured as X bits, there may be:

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, the PUSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, where the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_msg3_symbol_duration=t_si_symbol_duration; the following representation contains all 3 offsets. For example, when the value of PUSCH time domain resource configuration is 1, which represents that a time domain offset configuration with a configuration index value of 1 is used, the UE may obtain k0_msg3=k0_si+0=3, t_msg3_symbol_start=t_si_symbol_start+3=6, and t_msg3_symbol_duration=t_si_symbol_duration+1=4. That is, the PUSCH corresponding to MSG3 is illustrated as 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_si_symbol_duration, as shown in table two. At this time, when the value of PUSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_msg3_symbol_start=t_si_symbol_start+1 t_si_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be

3. The possible combinations of predefined time domain configurations are indicated directly by the X bits. For example x=2 bits, indicating the possible 4 time domain configuration combinations, as exemplified in table 4. If the value of PUSCH time domain resource allocation is 1, this represents: k0_msg3=1, t_msg3_symbol_start=6, t_msg3_symbol_duration=2. The PUSCH for MSG3 is illustrated as the consecutive 2 OFDM symbols starting with the 6 th OFDM symbol on slot n+1.

For the configuration of the MSG3PUSCH frequency domain resource to Y bits, there may be:

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PUSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, that is, the item has no offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, that is, the occupied PRB number offset is indicated to be 0, that is, no offset is indicated, and F_MSG3_PRB_duration=F_SI_PRB_duration; the example as in table 1 contains all 2 offsets. For example, when the value of PUSCH frequency domain resource configuration is 1, which represents a frequency domain offset configuration using a configuration index value of 1, the UE may obtain f_msg3_prb_start=f_si_prb_start+3=6, and f_msg3_prb_duration=f_si_prb_duration-3=3. That is, the PUSCH corresponding to MSG3 is a series of 3 PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_si_prb_duration, as shown in table 6. At this time, when the value of PUSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_msg3_prb_start=f_si_prb_start+1×f_si_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

3. The possible combinations of predefined frequency domain configurations are indicated directly by the Y bits. For example y=2 bits, indicating possible 4-medium frequency configuration combinations, as exemplified in table 8. If the value of PUSCH frequency domain resource allocation is 1, this represents: f_msg3_prb_start=6, f_msg3_prb_duration=2. The PUSCH illustrating MSG3 is the consecutive 2 PRBs starting at the 6 th PRB.

Example five

For the MSG3PUSCH time domain resource configured as X bits, there may be:

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, the PUSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, wherein the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_msg3_symbol_duration=t_rar_symbol_duration; the following representation contains all 3 offsets. For example, when the value of PUSCH time domain resource configuration is 1, which represents that a time domain offset configuration with a configuration index value of 1 is used, the UE may obtain k0_msg3=k0_rar+0=3, t_msg3_symbol_start=t_rar_symbol_start+3=6, and t_msg3_symbol_duration=t_rar_symbol_duration+1=4. That is, the PUSCH corresponding to MSG3 is illustrated as 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_rar_symbol_duration, as shown in table 2. At this time, when the value of PUSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_msg3_symbol_start=t_rar_symbol_start+1 t_rar_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PUSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, that is, the item has no offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, that is, the occupied PRB number offset is indicated to be 0, that is, no offset is indicated, and F_MSG3_PRB_duration=F_RAR_PRB_duration; the example as in table 1 contains all 2 offsets. For example, when the value of PUSCH frequency domain resource configuration is 1, which represents a frequency domain offset configuration using a configuration index value of 1, the UE may obtain f_msg3_prb_start=f_rar_prb_start+3=6, and f_msg3_prb_duration=f_rar_prb_duration-3=3. That is, the PUSCH corresponding to MSG3 is a series of 3 PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_rar_prb_duration, as shown in table 6. At this time, when the value of PUSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_msg3_prb_start=f_rar_prb_start+1×f_rar_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

Example six

For a random access process of downlink control channel triggering (PDCCH Order), a base station device needs to configure specific random access resources to a UE, where the downlink control channel triggering the random access process carries at least one or more of the following information:

● The number of downlink transmission beam indexes-X bits-represents that several downlink beam indexes are configured in the DCI for corresponding random access resources; wherein the downlink transmit beam index may be represented using the following information: a synchronization signal block (Synchronization signal block) index and/or a channel state information reference signal (channel state information-reference signal, CSI-RS) index; the synchronization signal block may include a primary synchronization signal, a secondary synchronization signal, and a broadcast signal including a demodulation reference signal. The downlink transmission beam index list information indicates that random access resources corresponding to 2 SSB indexes are configured in the DCI; if the number of the downlink transmission beam indexes is not configured, the base station configures random access resources according to the predefined number of the downlink transmission beam indexes.

● The information configured for each SSB index contains at least one or more of the following:

downlink transmit beam index-Y1 bits-represents the downlink transmit beam index configured by a particular base station device, e.g., 6 bits indicating which SSB index out of a particular 64 SSBs. Through the information, the UE can determine the downlink beam index bound with the configured random access resource;

random access preamble index-Y2 bits-represents a specifically configured random access preamble sequence index, e.g., 6 bits indicate which of the 64 preamble sequences supported in the cell; from this information, the UE may determine the transmitted preamble sequence.

The random access preamble time-frequency resource index-Y3 bits-represents random access channel (i.e., time-frequency resource location) information of a transmission-determined random access preamble, and indicates a random access channel mask index in a predefined random access channel mask table (PRACH mask table), which indicates a configuration of a random access channel in the random access channel mask table (PRACH mask table). In the random access channel mask table, at least the time domain position of the random access channel and/or the frequency domain position of the random access channel are included.

Time domain position of random access channel-y3_1 bits-as shown in the following table, wherein the random access channel time domain configuration indicates possible positions of the random access channel in time in one random access configuration period, such as random access channel mask index 2, representing the random access channel in all even positions in the time domain, wherein the even positions may be even positions in the order of the number of random access channel opportunities (RACH occisions) actually configured, or even positions of time units in which the random access channel opportunities actually configured are located, as shown in table 9.

Table 9-random access channel mask configuration example table 1

Random access channel mask index	Random access channel time domain configuration
		0	Random access channel opportunity 1
1	Random access channel opportunity 2
		2	Even number of random access channel opportunities
3	Odd number of random access channel opportunities

Frequency domain location of random access channel-y3_2 bits-indicated location index of system configured random access opportunities occurring in the frequency domain, which may be based on the number of random access opportunities that may occur at the same time, e.g., based on which of these 4 frequency domain locations the number of random access opportunities that may occur at the same time is 4, y3_2=2 bits, indicates which of these 4 frequency domain locations the configured random access opportunities are again; or according to the setting of the frequency domain location indicated in the predefined random access channel mask configuration table, as shown in the following table, where the random access channel frequency domain configuration indicates the possible locations of the random access channel in the frequency domain, such as the random access channel mask index 2, representing the random access channel in all even locations in the frequency domain, where the even locations may be the even locations in the number ordering of the random access channel opportunities (RACH occision) in the frequency domain according to the actual configuration, or the even locations of the frequency domain units in which the random access channel opportunities in the actual configuration are located, as shown in table 10.

Table 10-random Access channel mask configuration example Table two

Random access channel mask index	Random access channel frequency domain configuration
		0	Random access channel opportunity 1
1	Random access channel opportunity 2
		2	Even number of random access channel opportunities
3	Odd number of random access channel opportunities

Time-frequency domain position-y3_3 bits of random access channel-in addition to the two above-described ways of configuring time domain and frequency domain separately but informing the UE together, in particular, the random access opportunity index (RO index) may be directly indicated to the UE according to all random access opportunity ordering numbers that may occur in one random access configuration period; as shown in fig. 4, all random access opportunities that may occur in one random access configuration period are ordered in a time domain prioritized manner, from RO 0 to RO 9, and furthermore, the numbers may be prioritized from the frequency domain. In particular, when all random access opportunities are indicated, the specific RO index may also be indicated by a segment indication, e.g. a total of y3_3 bits, where the y3_3_1 bits are used to indicate a first level resource unit index (e.g. a subframe index), and/or the y3_3_2 bits are used to indicate a second level resource unit index (e.g. a random access slot index under the indicated subframe index), and/or the y3_3 bits are used to indicate a third level resource unit index (e.g. the indicated subframe index and the random access opportunity index under the corresponding random access slot index), where the resource unit index may be a time domain unit index, and/or a frequency domain unit index; the RO index is indicated directly by y3_3 bits or the possible random access channel opportunity configurations are indicated by the random access channel mask index, using a similar way to the predefined random access channel mask configuration variations described above, as shown in table 11.

Table 11-random access channel mask configuration example table three

In particular, all random access opportunities that may occur in the one random access configuration period may be further defined as all random access opportunities corresponding to one downlink beam index in the one configuration period; wherein the downstream beam index may be:

-a downlink beam index carried in the downlink control channel; or alternatively, the first and second heat exchangers may be,

-a downlink beam index used for transmitting downlink control channel information;

wherein, the configuration period may be:

-a random access configuration period;

the time period for which all SSBs in a complete SSB period can be fully mapped onto the corresponding RO may be, for example, an integer number of random access configuration periods.

For example, the network side configures 2 SSBs, namely ssb_0 and ssb_1, in one SSB period; in one configuration period, the network configures 4 ROs in total, and each RO can be mapped onto 1 SSB, i.e., ssb_0, and ssb_1 is mapped onto 2 ROs, i.e., RO index can be selected from {0,1 }; if ssb_0 is configured by the network and the configuration RO index is 1, it is indicated that the network configures the second RO of ROs corresponding to ssb_0 for the UE. The number of bits used to indicate the time-frequency resource index of the random access preamble in the downlink control information at this time varies with the number of SSBs each RO configured can map and the number of ROs in one configuration period. Specifically, the network may preset an RO index value (for example, RO index value 0), and when configured to the RO index value, it is represented that the UE may use all ROs corresponding to the downlink beam index in a configuration period to transmit the random access preamble, or the UE may randomly select one RO from all ROs corresponding to the downlink beam index in a configuration period to transmit the random access preamble.

Specifically, the random access channel mask index may be a random access channel opportunity index.

When the random access channel opportunity index is directly used to indicate one of the random access opportunities corresponding to one downlink beam index, there may be more than one complete SSB to RO mapping in one of the configuration periods, for example, m=2 SSBs may be configured in one of the configuration periods, n=1 SSBs may be mapped on one of the ROs in the mapping rule, (N is minimum 1/8, representing one complete SSB to RO mapping in the mapping rule, one SSB is mapped to 8 ROs at most, and thus y3_3=3 bits may be used to directly indicate one of the 1/N random access opportunities corresponding to the downlink beam index), but l=4 ROs may be configured in one of the configuration periods, indicating that at this time one configuration period (in this example, one random access configuration period) may have 2 complete SSBs to ROs, and thus it is necessary for the UE to make an explicit indication of which one of the complete SSBs to RO mapping in the 3 bits, where the determination may include at least one of the following ways:

a) The RO index carried in the downlink control channel indicates one RO index in the first complete SSB-to-RO mapping of the downlink beam index carried in the downlink control channel in one configuration period. In the above example shown in fig. 7, then in one configuration period (in this example, the random access configuration period), SSB1 is mapped to RO 0 and SSB2 is mapped to RO 1 in the first complete SSB-to-RO mapping; in the second full SSB to RO mapping, SSB1 maps to RO 2 and SSB2 maps to RO 3. When there are other numbers of SSBs and/or other SSB periods, and/or other random access configuration periods, and/or other numbers of random access opportunities, the SSB to RO mapping may be derived in the same manner, and time domain priority mapping, or frequency domain priority mapping, or specific rule mapping may be used. In the determining mode, the RO index carried in the downlink control channel indicates the RO index of the first complete SSB-to-RO mapping;

b) The RO index carried in the downlink control channel indicates one RO index in the last complete SSB-to-RO mapping of the downlink beam index carried in the downlink control channel in one configuration period. As shown in the example of fig. 7, in this determination mode, the RO index carried in the downlink control channel indicates the RO index of the last (i.e., the second in this example) full SSB-to-RO mapping;

c) The RO index carried in the downlink control channel indicates one RO index in any complete SSB-to-RO mapping of the downlink beam index carried in the downlink control channel in one configuration period. As shown in the example of fig. 7, in this determination manner, the RO index carried in the downlink control channel indicates the RO index of any one (i.e., the first or the second in this example) of the complete SSB-to-RO mapping; i.e. for example RO index carried in the downlink control channel, the UE may:

i. the overview randomly selects either RO 0 in the first full SSB-to-RO mapping or RO 2 in the second full SSB-to-RO mapping; or (b)

-indicating (backoff indication) the RO index in the first available full SSB to RO map found according to the processing power of the UE and/or the indicated backoff time; for example, the UE has strong processing capability (short processing time) and/or short indicated backoff time, and after receiving the downlink control channel triggering random access, the UE finds that the first available full SSB-to-RO mapping is the first full SSB-to-RO mapping, i.e., the UE sends the random access preamble using RO 0 in the first full SSB-to-RO mapping; if the UE has weak processing capability (long processing time) and/or long indicated backoff time, the UE discovers that the first available full SSB-to-RO mapping is a second full SSB-to-RO mapping after receiving the downlink control channel triggering random access, i.e., the UE uses RO 2 in the second full SSB-to-RO mapping to send the random access preamble;

d) The RO index carried in the downlink control channel indicates one RO index in all the complete SSB-to-RO maps in one configuration period of the downlink beam index carried in the downlink control channel. As shown in the example of fig. 7, in this determination mode, the RO index carried in the downlink control channel indicates the RO index of all (i.e., the first and second in this example) complete SSB-to-RO mappings; i.e. the UE may send the preamble on both corresponding RO indices of the two full SSB-to-RO mappings.

In particular, the above four ways of specifying the 3 bits indicates which complete SSB to use for the RO index of the SSB in the RO mapping are only used when one SSB is configured with more than 1/N (i.e. represents the number of ROs that can be mapped by one SSB at most in a complete SSB to RO mapping, for example, 1/n=8) ROs in a configuration period, i.e. in the existing configuration case, the UE may first determine the total number of ROs n_total_ro corresponding to one SSB in a configuration period, when:

● When n_total_ro >1/N, the UE determines the specific RO in at least one of the above four ways of specifying the RO index in which the y3_3 bit indicates the complete SSB to RO mapping by SSB;

● When n_total_ro < =1/N, the UE directly determines, according to the indication of y3_3 bits, the RO corresponding to the indicated SSB in one configuration period. That is, the y3_3 bit may indicate the RO index corresponding to the indicated SSB in all one or more complete SSB-to-RO maps.

In particular, the configuration manner provided in this embodiment may also be applied to other contention-free random access configurations, for example, when contention-free random access is configured for handover through higher layer signaling, one or more of the following information is also included in the corresponding higher layer signaling:

the number of downlink transmit beam indexes;

downlink transmit beam index;

random access preamble index;

random access preamble time-frequency resource index.

Example seven

The UE reads system information, acquires random access resource configuration, starts a random access flow, searches for possible random access response in the random access resource configuration according to a configured random access response search window (RAR window) after the UE transmits a random access preamble, acquires correct random access response, and transmits a random access message 3, namely the UE can acquire time-frequency resource position configuration information of a PUSCH in the transmitted message 3, or acquires time-frequency resource configuration information of the PUSCH retransmitted by the message 3 through DCI retransmitted by the scheduling message 3 when the UE retransmits the message 3; in this embodiment, taking msg3 retransmission PUSCH scheduled by DCI as an example; that is, the UE can determine consecutive t_msg3_symbol_duration OFDM symbols starting from the t_msg3_symbol_start OFDM symbol in a time slot of k0_msg3 after a time point corresponding to the UL GRANT in the DCI or RAR. For example: DCI indicates that the frequency domain start position of msg.3pusch starts from the third PRB, i.e., f_msg3_prb_start=3, and occupies 6 PRBs consecutively, i.e., f_msg3_prb_duration=6; meanwhile, if the nth slot is in the time domain where the DCI is received, according to the default time domain configuration, the UE can find that the PDSCH carrying MSG3 scheduled by the DCI is in the n+3rd slot (k0_msg3=3) in the time domain, where the 3 rd OFDM symbol is the consecutive 3 OFDM symbols (i.e. t_msg3_symbol_duration=3) of the OFDM start symbol (i.e. t_msg3_symbol_start=3).

After the UE sends message three, the UE prepares to receive the random access collision resolution message DCI.

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, PDSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, where the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_racr_symbol_duration=t_msg3_symbol_duration; the following representation contains all 3 offsets. For example, when the PDSCH time domain resource configuration has a value of 1, which represents a time domain offset configuration using a configuration index value of 1, the UE may obtain k0_racr=k0_msg3+0=3, t_racr_symbol_start=t_msg3_symbol_start+3=6, and t_racr_symbol_duration=t_msg3_symbol_duration+1=4. That is, it is illustrated that PDSCH corresponding to the random access collision resolution message (random access contention resolution, RACR) is 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_msg3_symbol_duration, as shown in table two. At this time, when the value of PDSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_racr_symbol_start=t_msg3_symbol_start+1 t_msg3_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

● Or may be a multiple indicating that the starting OFDM symbol offset is based on t_msg3_symbol_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and t_msg3_symbol_duration=3; representing 0*3 =0 start OFDM symbol offsets, 1*3 =3 start OFDM symbol offsets, 2*3 =6 start OFDM symbol offsets, 3*3 =9 start OFDM symbol offsets.

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when Y=2, the PDSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table can contain at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, namely, the item has no offset, for example, the frequency domain offset configuration table does not contain occupied PRB number offset, and the occupied PRB number offset is indicated to be 0, namely, no offset is indicated, and F_RACR_PRB_duration=F_MSG3_PRB_duration; the example as in table 1 contains all 2 offsets. For example, when the PDSCH frequency domain resource allocation has a value of 1, which represents a frequency domain offset allocation using a configuration index value of 1, the UE may obtain f_racr_prb_start=f_msg3_prb_start+3=6, and f_racr_prb_duration=f_msg3_prb_duration-3=3. That is, the PDSCH corresponding to RACR is described as 3 consecutive PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_msg3_prb_duration, as shown in table 6. At this time, when the value of PDSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_racr_prb_start=f_msg3_prb_start+1×f_msg3_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

● It may also be a multiple indicating that the starting PRB offset is based on f_msg3_prb_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and f_msg3_prb_duration=3; representing the starting PRB offset 0*3 =0 PRB offsets, 1*3 =3 PRB offsets, 2*3 =6 PRB offsets, 3*3 =9 PRB offsets.

Example eight

After the UE reads the system information, obtains the configuration of the random access resource, starts the random access procedure, searches for a possible random access response in the random access response search window according to the configured random access response search window (RAR window) after the UE sends the random access preamble, obtains the correct random access response to obtain the uplink GRANT of the initial transmission of the message 3, and sends the random access message 3, that is, the UE can obtain the configuration information of the time-frequency resource position of the PUSCH in the transmission message 3 in the UL GRANT of the RAR, or when the UE retransmits the message 3, the DCI retransmitted by the scheduling message 3 can obtain the configuration information of the time-frequency resource of the PUSCH retransmitted by the message 3.

In this embodiment, determining an uplink time-frequency resource of a new MSG3 based on time-frequency resource configuration information of a last MSG3 transmission and configuration information in a received DCI scheduling transmission of the new MSG3 is described; that is, the UE can determine consecutive t_msg3old_symbol_duration OFDM symbols starting from the t_msg3old_symbol_start OFDM symbol in a time slot of k0_msg3old after a time point corresponding to a time point of receiving ULGRANT in DCI or RAR at the last msg3 transmission. For example: the frequency domain starting position of msg.3pusch starts from the third PRB, i.e. f_msg3old_prb_start=3, and occupies 6 PRBs in succession, i.e. f_msg3old_prb_duration=6; meanwhile, if the last MSG3 configuration information is the nth time slot in the time domain, according to the default time domain configuration, the UE can find that the PUSCH of the last MSG3 is in the n+3rd time slot in the time domain (i.e., k0_msg3old=3), and the 3 rd OFDM symbol is the consecutive 3 OFDM symbols (i.e., t_msg3old_symbol_duration=3) of the OFDM start symbol (i.e., t_msg3old_symbol_start=3).

The UE may acquire a UL grant in the DCI that schedules a new retransmission of message 3, indicating the time-frequency resource location of PUSCH for msg3, i.e., time domain PUSCH resource, and/or PUSCH frequency domain resource configuration, frequency domain PUSCH resource.

For the MSG3PUSCH time domain resource configured as X bits, there may be:

1. indicating a time domain offset configuration in a preset configuration table by using X bits, for example, when x=2, the PUSCH time domain resource configuration represents index values (0, 1,2, 3) of the time domain offset configuration table, wherein the time domain offset configuration table may include at least a slot offset, a starting OFDM symbol offset, one or more of the number of occupied OFDM symbols offset, when any one of the three items is not included in the time domain offset configuration table, it indicates that the value of the item is 0, that is, it indicates that the item has no offset, for example, the time domain offset configuration table does not include the occupied OFDM symbol number offset, it indicates that the occupied OFDM symbol number offset is 0, that is, there is no offset, and t_msg3new_symbol_duration=t_msg3old_symbol_duration; the following representation contains all 3 offsets. For example, when the value of PUSCH time domain resource configuration is 1, which represents that a time domain offset configuration with a configuration index value of 1 is used, the UE may obtain k0_msg3new=k0_msg3old+0=3, t_msg3new_symbol_start=t_msg3old_symbol_start+3=6, and t_msg3new_symbol_duration=t_msg3old_symbol_duration+1=4. That is, the PUSCH corresponding to MSG3 is illustrated as 4 consecutive OFDM symbols starting from the 6 th OFDM symbol in the slot of n+3.

Specifically, the offset of the starting OFDM symbol may represent a multiple of t_msg3old_symbol_duration, as shown in table 2. At this time, when the value of PUSCH time domain resource configuration is 1, the calculation for the starting OFDM symbol becomes: t_msg3new_symbol_start=t_msg3old_symbol_start+1 x t_msg3old_symbol_duration=3+3=6.

Specifically, for bits indicating the starting OFDM symbol offset, it may be:

● Or may be a multiple indicating that the starting OFDM symbol offset is based on t_msg3old_symbol_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and t_msg3old_symbol_duration=3; representing 0*3 =0 start OFDM symbol offsets, 1*3 =3 start OFDM symbol offsets, 2*3 =6 start OFDM symbol offsets, 3*3 =9 start OFDM symbol offsets.

3. The possible combinations of predefined time domain configurations are indicated directly by the X bits. For example x=2 bits, indicating the possible 4 time domain configuration combinations, as exemplified in table 4. If the value of PUSCH time domain resource allocation is 1, this represents: k0_msg3new=1, t_msg3new_symbol_start=6, t_msg3new_symbol_duration=2. The PUSCH for MSG3 is illustrated as the consecutive 2 OFDM symbols starting with the 6 th OFDM symbol on slot n+1.

1. indicating a frequency domain offset configuration in a preset configuration table through Y bits, for example, when y=2, the PUSCH frequency domain resource configuration represents index values (0, 1,2, 3) of the frequency domain offset configuration table, wherein the frequency domain offset configuration table may include at least one or more of initial PRB offset and occupied PRB number offset, when any one of the two items is not included in the frequency domain offset configuration table, the value of the item is indicated to be 0, that is, the item has no offset, for example, the frequency domain offset configuration table does not include occupied PRB number offset, that is, the occupied PRB number offset is indicated to be 0, that is, there is no offset, and f_msg3new_prb_duration=f_msg3old_prb_duration; the example as in table 1 contains all 2 offsets. For example, when the value of PUSCH frequency domain resource configuration is 1, which represents a frequency domain offset configuration using a configuration index value of 1, the UE may obtain f_msg3new_prb_start=f_msg3old_prb_start+3=6, and f_msg3new_prb_duration=f_msg3old_prb_duration-3=3. That is, the PUSCH corresponding to MSG3 is a series of 3 PRBs starting from the 6 th PRB.

Specifically, the offset of the starting PRB may represent a multiple of f_msg3old_prb_duration, as shown in table 6. At this time, when the value of PUSCH frequency domain resource allocation is 1, the calculation for the starting PRB becomes: f_msg3new_prb_start=f_msg3old_prb_start+1×f_msg3old_prb_duration=3+1×3=6.

Specifically, for the bits indicating the starting PRB offset, it may be:

● It may also be a multiple indicating that the starting PRB offset is based on f_msg3oldjprb_duration; e.g., 2 bits, indicating [0,1,2,3] four possible configuration values, and f_msg3oldjprb_duration=3; representing the starting PRB offset 0*3 =0 PRB offsets, 1*3 =3 PRB offsets, 2*3 =6 PRB offsets, 3*3 =9 PRB offsets.

The possible combinations of predefined frequency domain configurations are indicated directly by the Y bits. For example y=2 bits, indicating possible 4-medium frequency configuration combinations, as exemplified in table 8. If the value of PUSCH frequency domain resource allocation is 1, this represents: f_msg3new_prb_start=6, f_msg3new_prb_duration=2. The PUSCH illustrating MSG3 is the consecutive 2 PRBs starting at the 6 th PRB.

The invention also provides a device for determining the time-frequency resource, which comprises the following modules, as shown in fig. 5:

The invention also discloses a device for determining the time-frequency resource of the random access channel, which comprises the following modules as shown in fig. 6:

the random access information configuration module comprises a random access channel time-frequency resource and a random access preamble code configured according to downlink control information;

the preamble transmission module includes a preamble transmission module that transmits a preamble on a random access time-frequency resource.

Example nine

The method for determining whether the system frame numbers (also called radio frame numbers) of the target cell and the current serving cell are used for determining the mapping relationship between the SSB and the RO of the target cell and finding the correct SSB and/or RO. Random access triggered for handover purposes, when the target cell and the serving cell are in any one of the following conditions:

1. paired spectrum (same frequency range) and the same frequency range;

2. unpaired spectrum (unpaired spectrum) and the same frequency range (same frequency range);

3. a pair-wise spectrum (different frequency range) of different frequency ranges;

4. the frequency spectrum (unpaired spectrum) is unpaired and the frequency ranges (different frequency range) are not identical.

When the number of the SSBs which can be configured by the system at most is l=4, or l=8, or l=64, the UE can identify that the absolute time difference between the ith radio frame of the current serving cell and the ith radio frame of the target cell is smaller than a fixed value or a preset value T through a certain condition; then, the wireless frame number of the target cell can be determined, the mapping relation between the SSB and the RO of the target cell can be determined, and the correct SSB and/or RO positions can be found; wherein, certain conditions can be any one of the following:

1. when the SSB to RO mapping pattern period (association pattern period) in the target cell is greater than 10 milliseconds;

2. when the SSB to RO mapping pattern period (association pattern period) in the target cell is not equal to 10 milliseconds;

wherein the fixed value or the preset value T may be any one of (ts=64×tc, tc=1/(480×4096×10) ³ ) =1/1966080000 seconds):

a)153600T _s ；

b)307200T _s ；

c)76800T _s ；

d)5ms；

e)10ms；

f)2.5ms。

the mapping pattern period (association pattern period) is composed of a plurality of mapping periods (association period), and one association period means that the least required N random access configuration periods PRACH configuration period are mapped to the corresponding ROs for all SSBs in one SSB period, and the N value is selected from table 12, for example, when the random access configuration period is 20ms, the N determining a minimum value from {1,2,4,8} may cause all SSBs to be mapped to the corresponding ROs for one SSB period. While the mapping of SSB-RO between two mapping pattern periods is fully repeated.

Table 12-corresponding example table of random access configuration period and SSB-RO mapping period

Examples ten

In this embodiment, a method for determining whether contention is successful in a contention-based random access procedure by a UE through received downlink control channel information will be described.

When the UE starts the contention based random access procedure and has sent message three, then the UE:

● At each hybrid automatic repeat request (HARQ, hybrid automatic repeat request) retransmission, the first OFDM symbol after message 3 transmission starts or restarts a random access contention resolution timer (ra-contentiontimer);

● Searching for a Possible Downlink Control Channel (PDCCH) during operation of the random access contention resolution timer;

● If a notice of receiving the PDCCH transmission from the lower layer is received;

■ A MAC CE (medium access control element, media Access ControlControl Element) if the C-RNTI is included in message three;

if the random access procedure is triggered by the MAC sublayer itself (e.g., for uplink scheduling request, etc.) or the RRC sublayer (e.g., for handover, etc.), and the detected PDCCH is marked by the C-RNTI [ e.g., cyclic redundancy check (Cyclic Redundancy Check, CRC) of the PDCCH is scrambled by the C-RNTI ], an uplink grant for a new transmission is received, and the HARQ process index (HARQ process ID/number) in the detected PDCCH is a fixed value or a preset value, e.g., when the HARQ process index in the detected PDCCH is 1.

-the UE may consider contention resolution successful; stopping the random access contention resolution timer; discarding the received TEMPORRARY C-RNTI; the UE may consider that the current random access procedure is successfully completed.

In the several examples provided in this detailed description, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be implemented by a program to instruct related hardware, the program may be stored in a computer readable storage medium, and the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.

While the method and apparatus provided in this embodiment have been described in detail, those skilled in the art will recognize that there are variations to the embodiments and the application scope of the embodiments according to the ideas of the examples of this embodiment, and the disclosure should not be construed as limiting the embodiments.

Claims

1. A method performed by a user equipment, UE, the method comprising:

Receiving configuration information corresponding to a synchronous signal block SSB sent by a base station, wherein the configuration information comprises: SSB index, random access preamble index, and random access channel PRACH mask index;

determining a random access channel opportunity RO corresponding to the SSB index according to the PRACH mask index;

determining a random access preamble based on the random access preamble index;

and sending a random access preamble to the base station on a random access resource corresponding to the RO.

2. The method of claim 1, wherein the RO index is first ordered in a frequency domain.

3. The method of claim 1, wherein the determining of the RO further comprises:

the RO is determined from a first available full SSB-to-RO map of the one or more full SSB-to-RO maps corresponding to the RO index.

4. The method of claim 1, wherein at least one RO corresponds to SSB.

5. The method according to any one of claim 1 to 4,

in the case of transmitting the random access preamble to switch to the target cell, an absolute time difference between the radio frame of the serving cell and the radio frame of the target cell is determined based on configuration information corresponding to the SSB of the target cell.

6. The method of claim 5, wherein if the SSB to RO mapping pattern period is not equal to 10ms, the absolute time difference is less than 153600Ts.

7. A method performed by a base station, the method comprising:

and sending configuration information corresponding to the synchronous signal block SSB to User Equipment (UE), wherein the configuration information comprises: an SSB index, a random access preamble index, and a random access channel PRACH mask index indicating a random access channel occasion RO corresponding to the SSB index;

receiving a random access preamble on a random access channel resource corresponding to an RO from the UE, wherein the RO is determined based on a PRACH mask index, the random access preamble is determined based on a random access preamble index;

and sending a random access response RAR to the UE based on the random access preamble.

8. The method of claim 7, wherein the RO index is first ordered in the frequency domain.

9. The method of claim 7, wherein at least one RO corresponds to SSB.

10. The method according to any of claims 7 to 8, wherein in case of transmitting a random access preamble to switch to a target cell, an absolute time difference between a radio frame of a serving cell and a radio frame of the target cell is determined based on configuration information corresponding to SSB of the target cell.

11. A user equipment, comprising:

a processor; and

a memory configured to store machine-readable instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1-6.

12. A base station, comprising:

a processor; and

a memory configured to store machine-readable instructions that, when executed by the processor, cause the processor to perform the method of any of claims 7-10.