WO2017177818A1

WO2017177818A1 - Random access method, apparatus, and system, base station, and user equipment (ue)

Info

Publication number: WO2017177818A1
Application number: PCT/CN2017/078436
Authority: WO
Inventors: 刘星; 吴昱民
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-15
Filing date: 2017-03-28
Publication date: 2017-10-19
Also published as: CN107302798A

Abstract

The present disclosure provides a random access method, apparatus, and system, a base station, and a user equipment (UE). The method comprises: determining an auxiliary base station of a secondary cell (SCell) comprising UE, the auxiliary base station being a base station different from a master base station of a primary cell (PCell) comprising the UE; and sending a first message to the determined auxiliary base station, the first message being used for triggering the auxiliary base station to process random access of the UE to the SCell. The present disclosure resolves the problem in the prior art that non-contention based random access cannot be implemented in a primary cell not belonging to a same base station with a primary cell.

Description

Random access method, device and system, base station and user equipment UE

Technical field

The present disclosure relates to the field of communications, and in particular, to a random access method, apparatus, and system, a base station, and a user equipment UE.

Background technique

In 3GPP Rel 10, in order to meet the requirements of single-user peak rate and system capacity increase, a Carrier Aggregation (CA) technology that aggregates multiple Component Carriers (CCs) to increase transmission bandwidth is introduced. The eNB (evolved NodeB) can enable the UE to simultaneously transmit uplink and downlink data on multiple carriers according to the capabilities of the user equipment (User Equipment), service requirements, and network load. The UE may use a continuous carrier or a non-contiguous carrier; the carriers in the same frequency band may be aggregated together, or carriers in different frequency bands may be aggregated together. In the carrier aggregation, the serving cell configured when the UE first establishes an RRC (Radio Resource Control) connection is a PCell (Primary Cell), and the carrier in the serving cell is called a PCC (Primary CC, the primary member). A carrier is used as an SCell (Secondary Cell), and a carrier in the serving cell is called an SCC (Secondary CC).

3GPP Rel 12 extends the carrier aggregation technology and scenario such that the aggregated carriers can belong to two different eNBs, respectively. At this point, the UE is required to have dual connectivity capabilities, and this technology is also known as Dual Connectivity (DC) technology. The main application scenario of the dual connectivity technology is a heterogeneous multi-layer network, which serves the needs of large-scale deployment of small base stations and non-ideal backhaul links. Due to the limitations of non-ideal backhaul links, small base stations in dual connectivity need to carry more functions and autonomy than SCells in carrier aggregation. However, in the dual connectivity, the functions and modules that are sensitive to delay requirements are placed on the small base station, which in turn makes it impossible for the Rel 10 UE to directly use the dual connectivity technology.

As mentioned above, the UE needs additional functionality and capabilities to support dual connectivity. For no double connection A capable UE, if it is necessary to aggregate carriers on two eNBs, also needs to use traditional carrier aggregation technology. The UE transmits data on the secondary cell, and needs to synchronize uplink and downlink with the secondary cell. The uplink synchronization can be implemented by performing non-contention random access on the secondary cell. However, an effective solution has not been proposed for how to implement a non-contention random access procedure on a secondary cell that does not belong to the same base station as the primary cell.

Summary of the invention

The present disclosure provides a random access method, apparatus, and system, a base station, and a user equipment UE, to at least solve the problem in the related art that non-contention random access cannot be implemented on a secondary cell that does not belong to the same base station as the primary cell.

According to an aspect of the present disclosure, a random access method is provided, including: determining a secondary base station including a secondary cell SCell of a user equipment UE, wherein the secondary base station is a base station different from a primary base station including a primary cell PCell of the UE Sending a first message to the determined secondary base station, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell.

Optionally, the first message is further used to trigger the secondary base station to allocate random access resources for the UE random access SCell.

Optionally, the first message carries a random access resource range that is allowed to be used by the secondary base station, and the first message is further used to trigger the secondary base station to allocate random access resources for the UE random access SCell within the random access resource range.

Optionally, after the sending the first message to the determined secondary base station, the method further includes: receiving, by the secondary base station, the second message, where the second message carries at least one of the following information: used to identify the secondary base station to perform randomization for the UE. a resource identifier for accessing the allocated random access resource; indication information for indicating that the secondary base station allows the UE to perform random access; and a random access-radio network temporary identifier RA-RNTI for scheduling the random access response.

Optionally, after receiving the second message sent by the secondary base station, the method further includes: determining, according to the second message, whether the random access resource allocated by the secondary base station for performing random access for the UE is available; determining that the secondary base station performs randomization for the UE If the allocated random access resource is available, the UE is instructed to perform random access on the allocated random access resource to the SCell; And the first random access reject message is sent to the secondary base station, where the first random access reject message is used to indicate that the secondary base station is randomly connected to the UE, where the random access resource allocated by the base station is unavailable. The secondary base station re-allocates the random access resources.

Optionally, the first random access reject message carries a random access resource range that is allowed to be used by the secondary base station, where the first random access reject message is used to indicate that the secondary base station is a random access assistant for the UE within the random access resource range. The base station re-allocates the random access resources.

Optionally, the resource identifier includes a random access preamble sequence index, and determining, according to the second message, whether the random access resource allocated by the secondary base station for performing random access for the UE is available, at least one of the following: determining that the random access preamble sequence index corresponds to Whether the random access resource is used to indicate the non-contention random access preamble sequence resource in the PCell; whether the random access preamble sequence index and the RA-RNTI are simultaneously allocated for use by other UEs.

Optionally, instructing the UE to perform random access to the SCell on the allocated random access resource includes: sending a physical downlink control channel PDCCH order to the UE, where the PDCCH order carries the identifier of the resource identifier and the secondary base station, and is used to indicate the UE Random access is performed on the SCell of the secondary base station on the allocated random access resources.

Optionally, the sending the physical downlink control channel PDCCH command to the UE includes: instructing the secondary base station to send a PDCCH order to the UE.

Optionally, after the PDCCH command is sent to the UE, the method further includes: receiving the first random access response sent by the secondary base station, where the first random access response carries the second random access that is sent by the primary control base station to the UE. a first transmission time of the response, and at least one of the following parameters: an uplink transmission timing advance amount, a backoff parameter, a random access preamble sequence index, an uplink scheduling grant corresponding to an uplink resource allocated to the UE, and a cell wireless network temporary identifier; Whether the first transmission time is a time with an available PDCCH resource; and when it is determined that the first transmission time is a time with an available PDCCH resource, the second random access response is sent to the UE at the first transmission time.

Optionally, the method further includes: sending a third message to the secondary base station, where the third message carries a time with the available PDCCH resources, to assist the secondary base station to select the first sending time from the time of having the available PDCCH resources.

Optionally, the second message further includes a second sending moment for instructing the master base station to send a PDCCH order to the UE, and the sending the physical downlink control channel PDCCH order to the UE includes: determining whether the second sending moment is an available PDCCH resource Time; when it is determined that the second transmission time is a time having an available PDCCH resource, the PDCCH order is transmitted to the UE at the second transmission time.

Optionally, the first message carries a moment with the available PDCCH resources, and is used to assist the secondary base station to select the second sending moment from the moments with the available PDCCH resources.

Optionally, if it is determined that the second sending moment is not the time of the available PDCCH resource, the method further includes: sending, to the secondary base station, the first random access reject message, where the first random access reject message is further carried At the moment of having the available PDCCH resources, the first random access reject message is further used to indicate that the secondary base station selects the time with the available PDCCH resources as the second sending moment.

According to another aspect of the present disclosure, a random access method is provided, including: receiving a first message sent by a master control base station, where the first message is used to trigger a process of performing random access to a secondary cell SCell by a user equipment UE, The primary control base station is a base station including a primary cell PCell of the UE, and the primary control base station is a base station different from the secondary base station of the SCell including the UE; and performs processing on the UE randomly accessing the SCell according to the first message.

Optionally, performing processing on the UE randomly accessing the SCell according to the first message includes: allocating a random access resource to the UE random access SCell according to the first message.

Optionally, after receiving the first message sent by the master control base station, the method further includes: sending a second message to the master control base station, where the second message carries at least one of the following information: used to identify that the UE is randomly accessed by the SCell a resource identifier of the allocated random access resource; indication information indicating that the UE is allowed to access the SCell randomly; and a random access-radio network temporary identifier RA-RNTI for identifying the UE to perform random access.

Optionally, after the sending the second message to the primary control base station, the method further includes: receiving a third message sent by the primary control base station to indicate that the allocated random access resource is available; and sending a physical downlink control channel PDCCH command to the UE, where The PDCCH command carries a resource identifier, and is used to instruct the UE to perform random access to the SCell on the allocated random access resource.

Optionally, after the sending the physical downlink control channel PDCCH command to the UE, the method further includes: sending, by the primary control base station, a first random access response, to indicate that the primary control base station sends the second random access response to the UE at the first sending moment. The first random access response carries a first transmission time indicating that the primary control base station sends a second random access response to the UE, and at least one of the following parameters: an uplink transmission timing advance amount, a backoff parameter, and a random connection. The index of the preamble sequence, the uplink scheduling grant corresponding to the uplink resource allocated to the UE, and the temporary identifier of the cell radio network.

According to another aspect of the present disclosure, a random access method is provided, including: receiving a PDCCH order sent by a master control base station, where the PDCCH order carries a random access allocated by the secondary base station to the user equipment UE to randomly access the secondary base station The resource identifier of the resource and the identifier of the secondary base station, the PDCCH command is used to indicate that the UE performs random access to the secondary cell SCell of the secondary base station on the allocated random access resource, and the secondary base station is the primary control base station with the primary cell PCell including the UE. Different base stations; perform random access to the SCell on the allocated random access resources according to the PDCCH order.

According to another aspect of the present disclosure, a random access apparatus is provided, comprising: a determining module configured to determine a secondary base station including a secondary cell SCell of a user equipment UE, wherein the secondary base station is a primary cell PCell including a UE The base station is different from the base station; the sending module is configured to send the first message to the determined secondary base station, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the secondary cell SCell.

According to another aspect of the present disclosure, a random access apparatus is provided, including: a first receiving module, configured to receive a first message sent by a master control base station, where the first message is used to trigger random access to the user equipment UE Performing processing in the secondary cell SCell, the primary control base station is a base station including the primary cell PCell of the UE, and the primary control base station is a base station different from the secondary base station of the SCell including the UE; the processing module is configured to randomly access the UE according to the first message. SCell performs processing.

According to another aspect of the present disclosure, a random access apparatus is provided, including: a second receiving module, configured to receive a PDCCH order sent by a master base station, where the PDCCH order carries a secondary base station to randomly access the user equipment UE The resource identifier of the random access resource allocated by the secondary base station and the identifier of the secondary base station, where the PDCCH command is used to instruct the UE to perform random access to the secondary cell SCell of the secondary base station on the allocated random access resource, and the secondary base station includes the UE The base station of the primary cell PCell has different base stations; the random access module is configured to perform random access on the SCell on the allocated random access resources according to the PDCCH order.

According to another aspect of the present disclosure, a base station is provided, including a primary cell PCell of a user equipment UE, configured to determine a secondary base station including a secondary cell SCell of a user equipment UE, and to send a first message to the determined secondary base station, where The secondary base station is a base station different from the primary control base station of the primary cell PCell of the UE, and the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell.

According to another aspect of the present disclosure, a base station is provided, configured to receive a first message sent by a master control base station, and perform processing on a secondary cell SCell that the user equipment UE randomly accesses the secondary base station according to the first message, where A message is used to trigger a process of performing random access to the SCell for the UE. The primary control base station is a base station including a primary cell PCell of the UE, and the primary control base station is a base station different from the secondary base station of the SCell including the UE.

According to another aspect of the present disclosure, a user equipment UE is provided, configured to receive a PDCCH order sent by a master base station, and perform random execution on a secondary cell SCell of the secondary base station on a random access resource allocated by the secondary base station according to the PDCCH order. Access, where the PDCCH command carries the resource identifier of the random access resource allocated by the secondary base station for the UE random access secondary base station and the identifier of the secondary base station, and the PDCCH command is used to instruct the UE to perform the SCell on the allocated random access resource. Random access, the secondary base station is a base station different from the primary base station including the primary cell PCell of the UE.

According to another aspect of the present disclosure, a random access system is provided, including: a user equipment UE; a primary control base station, including a primary cell PCell of the UE, configured to determine a secondary base station including a secondary cell SCell of the UE, and determine The secondary base station sends a first message, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell; the secondary base station is a base station different from the primary control base station, and is configured to randomly access the UE according to the first message. SCell performs processing.

According to another aspect of the present disclosure, there is provided a storage medium, which may be arranged to store program code for performing a step of determining a secondary base station comprising a secondary cell SCell of a user equipment UE, wherein the secondary base station is a base station different from the master base station including the primary cell PCell of the UE; transmitting a first message to the determined secondary base station, wherein the first message is used for touching The transmitting secondary base station performs processing on the UE randomly accessing the SCell.

According to another aspect of the present disclosure, a storage medium is provided, which may be configured to store program code for performing the following steps: receiving a first message sent by a master base station, wherein the first message is used to trigger The user equipment UE is randomly connected to the secondary cell SCell, and the primary control base station is a base station including the primary cell PCell of the UE, and the primary control base station is a base station different from the secondary base station of the SCell including the UE; and the UE is randomly connected according to the first message. Into the SCell to perform processing.

According to another aspect of the present disclosure, a storage medium is provided, which may be configured to store program code for performing a step of: receiving a PDCCH order transmitted by a master base station, wherein the PDCCH order carries a secondary base station The user equipment UE randomly accesses the resource identifier of the random access resource allocated by the secondary base station and the identifier of the secondary base station, and the PDCCH command is used to instruct the UE to perform random access to the secondary cell SCell of the secondary base station on the allocated random access resource, and assist The base station is a base station different from the master base station including the primary cell PCell of the UE; performs random access to the SCell on the allocated random access resources according to the PDCCH order.

Embodiments of the present disclosure, by determining a secondary base station that includes a secondary cell SCell of a user equipment UE, wherein the secondary base station is a base station different from a primary control base station including a primary cell PCell of the UE; and transmitting a first message to the determined secondary base station, where The first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell, and solves the problem that the non-contention random access cannot be implemented on the secondary cell that does not belong to the same base station as the primary cell in the related art, and then the first message is obtained. The triggering the secondary base station performs the process of the UE randomly accessing the SCell, so that the UE can perform the non-contention random access process on the secondary cell that does not belong to the same base station as the primary cell, thereby effectively ensuring that the UE supports carrier aggregation in the cross-base station scenario, thereby Increased the transfer rate of user plane data.

DRAWINGS

The drawings described herein are intended to provide an understanding of the present disclosure, and are intended to be a part of the present disclosure. In the drawing:

1 is a flow chart of a random access method in accordance with an embodiment of the present disclosure;

2 is a flow chart of another random access method in accordance with an embodiment of the present disclosure;

3 is a flow chart of another random access method in accordance with an embodiment of the present disclosure;

4 is a schematic diagram of a preferred random access method in accordance with an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another preferred random access method according to an embodiment of the present disclosure; FIG.

6 is a structural block diagram of a random access device according to an embodiment of the present disclosure;

FIG. 7 is a structural block diagram of another random access device according to an embodiment of the present disclosure; FIG.

FIG. 8 is a structural block diagram of another random access device according to an embodiment of the present disclosure; FIG.

9 is a schematic diagram of a random access system in accordance with an embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

A random access method is provided in this embodiment. FIG. 1 is a flowchart of a random access method according to an embodiment of the present disclosure. As shown in FIG. 1 , the process includes the following steps:

Step S102, determining a secondary base station including a secondary cell SCell of the user equipment UE, wherein the secondary base station is a base station different from the primary control base station including the primary cell PCell of the UE.

Step S104: Send a first message to the determined secondary base station, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell.

In this embodiment, the serving cell configured when the UE first establishes an RRC (Radio Resource Control) connection is a PCell (Primary Cell), and the carrier in the serving cell is called a PCC (Primary CC, the primary member). The carrier in the serving cell is called an SCCC (Secondary Cell). The carrier in the serving cell is called an SCC (Secondary CC).

In this embodiment, the execution bodies of steps S102 and S104 are different from the auxiliary base station. The base station, preferably, the base station is an eNB (PCell eNB, P-eNB, a master base station) including a PCell of the UE, wherein the master base station may further include an SCell of one or more UEs. The secondary base station (SCell, eNB, S-eNB) contains only SCells of one or more UEs.

Optionally, the first message is further used to trigger the secondary base station to allocate a random access resource to the UE random access secondary cell SCell.

The primary control base station may send a first message (a random access trigger command) to the secondary base station, and preferably, the primary base station UE is notified by the command to initiate a random access procedure to the secondary cell on the secondary base station and request the secondary base station as a secondary device. The cell allocates random access resources. The random access resource includes a random access preamble index (Preamble Index) and/or a random access time-frequency resource index (PRACH Mask Index).

The master base station may provide the secondary base station with a range of random access resources allowed by the secondary base station to assist the secondary base station in selecting the random access resource. The primary control base station may also provide one or more times when the primary cell has a PDCCH (Physical Downlink Control Channel) resource, and the secondary base station may send a random access response to the primary control base station at the moment.

Optionally, the first message carries a random access resource range that is allowed to be used by the secondary base station, and the first message is further used to trigger the secondary base station to allocate random access resources for the UE random access secondary cell SCell within the random access resource range. . The random access resources allocated by the secondary base station may include a random access preamble sequence index and/or a random access time-frequency resource index. By informing the secondary base station to allow the range of random access resources used by the secondary base station, it helps the secondary base station to quickly select a suitable random connection. Into resources, improve the efficiency of resource allocation.

After the primary control base station sends the first message to the determined secondary base station, the secondary base station may confirm to the primary control base station that the random access is initiated, and notify the primary control base station of the allocated random access resources, where the random access resources may include random Access preamble sequence index and/or random access time-frequency resource index. The secondary base station can simultaneously send the RA-RNTI (Random Access-Radio Network Temporary Identity) determined according to the random access time-frequency resource to the master base station. In addition, the secondary base station may also indicate a transmission moment of a PDCCH order for triggering random access of the UE. The master base station can determine whether the random access resource allocated by the secondary base station is available based on the foregoing information.

Optionally, after receiving the second message sent by the secondary base station, the method further includes: determining, according to the second message, whether the random access resource allocated by the secondary base station for performing random access for the UE is available; determining that the secondary base station performs randomization for the UE If the allocated random access resource is available, the UE is instructed to perform random access on the allocated random access resource to the SCell; and the random access resource allocated by the secondary base station to perform random access for the UE is not available. In this case, the first random access reject message is sent to the secondary base station, where the first random access reject message is used to indicate that the secondary base station re-allocates the random access resource for the UE random access secondary base station.

In the case that it is determined that the random access resource allocated by the secondary base station for the random access of the UE is available, the indication that the UE performs the random access to the SCell on the allocated random access resource may include: the primary control base station directly indicates the UE Performing random access to the SCell, and the primary control base station may also notify the secondary base station to determine a message for notifying that the random access resource allocated by the secondary base station is available, and may perform random access; or the primary control base station may first notify the auxiliary. The base station is instructed by the secondary base station to perform random access to the SCell by the UE.

Optionally, the resource identifier includes a random access preamble sequence index, and is determined according to the second message. Whether the random access resource allocated by the base station for the random access of the UE is available includes at least one of the following: determining whether the random access resource corresponding to the random access preamble sequence index is used to indicate the non-contention random access preamble sequence in the PCell Resources; determine whether the random access preamble sequence index and the RA-RNTI are simultaneously allocated for use by other UEs.

For example, the master control base station determines that the random access preamble sequence index provided by the secondary base station also indicates the non-contention random access preamble sequence resource in the primary cell, the random access preamble sequence index, and the RA-RNTI determined by the random access time-frequency resource. If not allocated to other UEs at the same time, it can be confirmed that the random access resources allocated by the secondary base station for the random access of the UE are available. Alternatively, the judgment of availability or not may be performed only by one of the above conditions.

Optionally, if the random access resource provided by the secondary base station does not meet the foregoing condition, the primary control base station may also send a reject message to the secondary base station, where the message may carry a random access resource range allowed by the secondary base station, and is used to assist the secondary base station. Reselect random access resources. For example, the foregoing first random access reject message carries a random access resource range that is allowed to be used by the secondary base station, and is used to indicate that the secondary base station re-allocates random access resources for the UE random access secondary base station within the random access resource range. . In addition, the message may also carry one or more moments in which the primary cell has available PDCCH resources. If the random access resource provided by the secondary base station satisfies the foregoing condition, the primary control base station may send an acknowledgement message to the secondary base station, where the message may carry one or more moments in which the primary cell has available PDCCH resources.

The master control base station sends a PDCCH command to the UE. The command may carry DCI (Downlink Control Information) format 1A for carrying the information of the random access resource received from the secondary base station (for example, random access). A preamble sequence index and/or a random access time-frequency resource index), and a secondary cell identity identifier, to indicate that the UE initiates non-contention random access to the secondary cell located on the secondary base station. The UE may use the specified random access preamble sequence to the auxiliary base station on the specified random access time-frequency resource according to the PDCCH order. The cell initiates non-contention random access.

In this embodiment, the base station does not directly perform a random access notification to the UE, but notifies the secondary base station, and the secondary base station instructs the UE to perform random access to the SCell on the allocated random access resources.

After transmitting the physical downlink control channel PDCCH command to the UE, the secondary base station receives the random access preamble sequence sent by the UE, and the secondary base station selects an uplink transmission timing advance (Uplink Time Advance), a backoff (Backoff) parameter, and a random access preamble sequence. The random access parameters, such as the uplink grant authorization (UL grant) and/or the temporary C-RNTI (Cell Radio Network Temporary Identity) corresponding to the uplink resource allocated to the UE, constitute a random access response (Random) Access Response (RAR) (first random access response), and sent to the master base station, and indicates the time (N2) at which the random access response is sent. The master base station determines whether the primary cell has available PDCCH resources at time N2. If the transmission time N2 provided by the secondary base station does not satisfy the above condition, the primary control base station sends a reject message to the secondary base station, where the message may carry one or more times when the primary cell has available PDCCH resources. If the transmission time N2 provided by the secondary base station satisfies the above condition, the primary control base station forms multiple random access responses (including random access responses received from the secondary base station) into a random access response MAC (Media Access Control, media access control). A PDU (Protocol Data Unit) is sent to the UE. The PDCCH command for scheduling the random access response MAC PDU is transmitted at time N2.

Optionally, the method further includes: sending a third message to the secondary base station, where the third message carries a time with the available PDCCH resources, to assist the secondary base station to select the first transmission time from the time of having the available PDCCH resources. The third message may be sent when it is determined that the random access resource is available, and the sending timing of the message may be before, after, or when the PDCCH command is sent.

In this embodiment, the secondary base station knows in advance the time when the primary control base station has the available PDCCH resources, and further indicates the time with the available PDCCH resources to the primary control base station, and the primary control base sends a random access response to the UE at the moment (second Random access response).

For example, the master base station determines that the random access preamble sequence index provided by the secondary base station also indicates the non-contention random access preamble sequence resource in the primary cell, and the random access preamble sequence index and the RA-RNTI determined by the random access time-frequency resource are not determined. While being allocated to other UEs for use, and the primary cell has available PDCCH resources at time N1, the master base station sends a PDCCH order to the UE at time N1.

According to another aspect of the present disclosure, a random access method is also provided, as shown in FIG. 2, the method includes:

Step S202: Receive a first message sent by the primary control base station, where the first message is used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the primary control base station is a base station including the primary cell PCell of the UE, and the primary control base station It is a base station different from the secondary base station of the SCell including the UE.

Step S204, performing processing on the UE randomly accessing the SCell according to the first message.

In this embodiment, the execution body of steps S202 and S204 may be another base station different from the master base station, preferably a secondary base station.

In the embodiment of the present disclosure, the first message sent by the master control base station is received, where the first message is used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the master base station is a base station including the primary cell PCell of the UE, The main control base station is a base station different from the secondary base station of the SCell including the UE, and performs processing on the UE randomly accessing the SCell according to the first message, which solves the problem that the related technology cannot achieve non-competition on the secondary cell that does not belong to the same base station as the primary cell. The problem of random access, and then the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell, so that the UE can perform the non-contention random access process on the secondary cell that does not belong to the same base station as the primary cell, thereby effectively ensuring The UE supports carrier aggregation in a cross-base station scenario, thereby improving the transmission rate of user plane data.

According to another aspect of the present disclosure, a random access method is provided, as shown in FIG. 3, the method includes:

Step S302: Receive a PDCCH order sent by the master control base station, where the PDCCH order carries the resource identifier of the random access resource allocated by the secondary base station for the user equipment UE, and the identifier of the secondary base station, where the PDCCH command is used to indicate the UE. Random access is performed on the secondary cell SCell of the secondary base station on the allocated random access resource, and the secondary base station is a base station different from the primary base station including the primary cell PCell of the UE.

Step S304, performing random access on the SCell on the allocated random access resources according to the PDCCH order.

In this embodiment, the execution body of step S302 and step S304 is preferably a UE.

In the embodiment of the present disclosure, the PDCCH command is received by the master control base station, where the PDCCH command carries the resource identifier of the random access resource and the identifier of the secondary base station allocated by the secondary base station to the user equipment UE, and the PDCCH command is used. Instructing the UE to perform random access to the secondary cell SCell of the secondary base station on the allocated random access resource, the secondary base station is a different base station from the primary control base station including the primary cell PCell of the UE, and the allocated random access according to the PDCCH order The problem is that the non-contention random access is implemented on the secondary cell that does not belong to the same base station as the primary cell in the related art, and the secondary base station is used to trigger the secondary base station to randomly access the SCell. The processing is performed, so that the UE can perform the non-contention random access procedure on the secondary cell that does not belong to the same base station as the primary cell, thereby effectively ensuring that the UE supports carrier aggregation in the cross-base station scenario, thereby improving the transmission rate of the user plane data.

Preferred embodiments of the present disclosure are provided below.

Embodiment 1

4 is a schematic diagram of a preferred random access method in accordance with an embodiment of the present disclosure. As shown in FIG. 4, the method includes:

In step S401, the master control base station (p-eNB) sends a random access trigger command to the secondary base station (S-eNB) to notify the secondary base station user equipment that the UE needs to initiate a random access procedure to the secondary cell on the secondary base station and request assistance. The base station allocates a random access resource to the secondary cell, where the random access resource includes a random access preamble index (Preamble Index) and/or a random access time-frequency resource index (PRACH Mask Index).

At the same time, the master base station can provide the secondary base station with a range of random access resources allowed by the secondary base station to assist the secondary base station in selecting the random access resource. The master base station may also provide one or more moments in which the primary cell has available PDCCH (Physical Downlink Control Channel) resources.

Step S402, the secondary base station determines a random access resource, including a random access preamble sequence index and/or a random access time-frequency resource index.

Step S403: The secondary base station confirms to the primary control base station to initiate the random access, and notifies the random access resource to the primary control base station, where the random access resource includes a random access preamble sequence index and/or a random access time-frequency resource index. The secondary base station simultaneously sends the RA-RNTI determined by the random access time-frequency resource to the primary control base station, and indicates the transmission time N1 of the PDCCH order used to trigger the random access of the UE.

Step S404: The master control base station determines whether the random access resource provided by the secondary base station is available, and includes determining whether the random access preamble sequence index provided by the secondary base station indicates the non-contention random access preamble sequence resource and the random access preamble in the primary cell. The RA-RNTI determined by the sequence index and the random access time-frequency resource is not allocated to other UEs, and the master base station determines whether the primary cell has available PDCCH resources at time N1.

Step S405: If the random access resource and the sending time N1 provided by the secondary base station do not satisfy the foregoing condition, the primary control base station sends a reject message to the secondary base station, where the message may carry the random access resource range allowed by the secondary base station, and is used for assistance. Secondary base station reselects random access resources The source, in addition, the message may also carry one or more moments in which the primary cell has available PDCCH resources.

Step S406: If the random access resource provided by the secondary base station satisfies the foregoing condition, the primary control base station sends an acknowledgement message to the secondary base station, where the message carries one or more times when the primary cell has available PDCCH resources.

It should be noted that, the primary cell carried in the message has one or more moments of available PDCCH resources, and the primary control base station may send the message to the secondary base station, and the secondary base station selects one or more of the available PDCCH resources according to the message. A moment is selected from the moment, and the base station is instructed to enable the master base station to send a random access response at the moment.

Step S407: The master base station sends a PDCCH order to the UE at time N1, where the command carries DCI format 1A, and is used to carry information about random access resources received from the secondary base station, including random access preamble index and/or random. Access time-frequency resource index, and secondary cell identity. The command is used to instruct the UE to initiate non-contention random access to the secondary cell located on the secondary base station.

Step S408: The UE initiates non-contention random access (transmitting a Preamble code) to the secondary cell on the secondary base station by using the specified random access preamble sequence on the specified random access time-frequency resource according to the PDCCH order.

Step S409, after receiving the random access preamble sequence sent by the UE, the secondary base station, the uplink transmission timing advance amount, the backoff parameter, the random access preamble sequence index, and the uplink scheduling grant corresponding to the uplink resource allocated to the UE (UL grant) And/or temporary C-RNTI, Preamble index and other parameters constitute a random access response, and send it to the master base station, and indicate to the master base station the time N2 of the random access response transmission.

Step S410: The master base station determines whether the primary cell has available PDCCH resources at time N2.

Step S411: If the transmission time N2 provided by the secondary base station does not satisfy the foregoing condition, the primary control base station sends a reject message to the secondary base station, where the message may carry one or more times when the primary cell has available PDCCH resources.

Step S412, if the transmission time N2 provided by the secondary base station satisfies the above condition, the master base station forms a plurality of random access responses (including random access responses received from the secondary base station) into a random access response MAC PDU at time N2. Send to the UE. The PDCCH command for scheduling the random access response MAC PDU is transmitted at time N2.

This embodiment describes a process in which the UE performs non-contention random access on the secondary cell of the secondary base station. In this embodiment, the UE may perform a non-contention random access procedure on the secondary cell that does not belong to the same base station as the primary cell, thereby ensuring The UE supports carrier aggregation in the cross-base station scenario, and improves the user plane data transmission rate.

Embodiment 2

FIG. 5 is a schematic diagram of another preferred random access method in accordance with an embodiment of the present disclosure. As shown in FIG. 5, the method includes:

In step S501, the master control base station (P-eNB) sends a random access trigger command to the secondary base station (S-eNB) to notify the secondary base station user equipment that the UE needs to initiate a random access procedure to the secondary cell on the secondary base station and request assistance. The base station allocates a random access resource to the secondary cell, where the random access resource includes a random access preamble sequence index and/or a random access time-frequency resource index.

At the same time, the master base station can provide the secondary base station with a range of random access resources allowed by the secondary base station to assist the secondary base station in selecting the random access resource.

Step S502: The secondary base station determines a random access resource, where the random access resource includes a random access preamble sequence index and/or a random access time-frequency resource index.

Step S503: The secondary base station confirms to the primary control base station to initiate the random access, and notifies the primary access base station of the random access resource, including the random access preamble sequence index and/or the random access time-frequency resource index. The secondary base station simultaneously transmits the RA-RNTI determined by the random access time-frequency resource to the primary control base station.

Step S504: The master control base station determines whether the random access resource provided by the secondary base station is available, and includes determining whether the random access preamble sequence index provided by the secondary base station indicates the non-contention random access preamble sequence resource in the primary cell, and random access The RA-RNTI determined by the preamble sequence index and the random access time-frequency resource is not allocated to other UEs at the same time.

Step S505: If the random access resource provided by the secondary base station does not meet the foregoing condition, the primary control base station sends a reject message to the secondary base station, where the message may carry a random access resource range allowed by the secondary base station, and is used to assist the secondary base station to reselect. Random access resources.

Step S506: If the random access resource provided by the secondary base station satisfies the foregoing condition, the primary control base station sends an acknowledgement message to the secondary base station, where the acknowledgement message carries one or more times when the primary cell has available PDCCH resources.

Step S507: After receiving the acknowledgement message, the secondary base station sends a PDCCH order to the UE, carrying the DCI format 1A, and carrying the information of the random access resource, where the information may include a random access preamble sequence index and/or random access. Frequency resource index. The command is used to instruct the UE to initiate non-contention random access to the secondary cell located on the secondary base station.

Step S508: The UE initiates non-contention random access (transmitting a Preamble code) to the secondary cell on the secondary base station by using the specified random access preamble sequence on the specified random access time-frequency resource according to the PDCCH order.

Step S509: After receiving the random access preamble sequence sent by the UE, the secondary base station, the uplink transmission timing advance amount, the backoff parameter, the random access preamble sequence index, and the uplink scheduling grant (UL grant) corresponding to the uplink resource allocated to the UE And a parameter such as a temporary C-RNTI constitutes a random access response, and sends it to the master base station, and indicates to the master base station the time N2 at which the random access response is transmitted.

In step S510, the master base station determines whether the primary cell has available PDCCH resources at time N2.

Step S511: If the transmission time N2 provided by the secondary base station does not satisfy the foregoing condition, the primary control base station sends a reject message to the secondary base station, where the message may carry one or more times when the primary cell has available PDCCH resources.

Step S512: If the sending time N2 provided by the secondary base station satisfies the foregoing condition, the master base station sends a plurality of random access responses (including random access responses received from the secondary base station) to form a random access response MAC PDU to the UE. The PDCCH command for scheduling the random access response MAC PDU is transmitted at time N2.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present disclosure, which is essential or contributes to the related art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, CD-ROM). The instructions include a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present disclosure.

In this embodiment, a random access device is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and is not described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

FIG. 6 is a structural block diagram of a random access device according to an embodiment of the present disclosure. As shown in FIG. 6, the device includes:

The determining module 62 is configured to determine a secondary base station including the secondary cell SCell of the user equipment UE, wherein the secondary base station is a different base station than the primary control base station including the primary cell PCell of the UE.

The sending module 64 is configured to send a first message to the determined secondary base station, where the first message is used to trigger the secondary base station to perform processing on the UE random access secondary cell SCell.

In the embodiment of the present disclosure, the determining module 62 determines a secondary base station that includes the secondary cell SCell of the user equipment UE, where the secondary base station is a base station different from the primary control base station including the primary cell PCell of the UE, and the sending module 64 sends the determined secondary base station to the determined secondary base station. Sending a first message, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the secondary cell SCell, and the related technology cannot implement non-contention random access on the secondary cell that does not belong to the same base station as the primary cell. The problem is that the first message triggers the secondary base station to perform processing on the UE randomly accessing the SCell, so that the UE can perform the non-contention random access procedure on the secondary cell that does not belong to the same base station as the primary cell, thereby effectively ensuring that the UE is in the cross Carrier aggregation is supported in the base station scenario, thereby increasing the transmission rate of user plane data.

A random access device is also provided in this embodiment. FIG. 7 is a structural block diagram of another random access device according to an embodiment of the present disclosure. As shown in FIG. 7, the device includes:

The first receiving module 72 is configured to receive a first message sent by the master control base station, where the first message is used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the primary control base station is the primary cell PCell including the UE. The base station, which is a base station different from the secondary base station of the SCell including the UE.

The processing module 74 is configured to perform processing on the UE randomly accessing the SCell according to the first message.

In the embodiment of the present disclosure, the first receiving module 72 receives the first message sent by the master control base station, where the first message is further used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the master control base station includes the UE. The base station of the primary cell PCell is a base station different from the secondary base station of the SCell including the UE. The processing module 74 performs processing on the UE randomly accessing the SCell according to the first message, and solves the problem that the related technology cannot belong to the primary cell. The problem of non-contention random access is implemented on the secondary cell of the same base station, and then the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell, so that the UE can perform non-competition on the secondary cell that does not belong to the same base station as the primary cell. The random access process ensures that the UE supports carrier aggregation in the cross-base station scenario, thereby improving the transmission rate of the user plane data.

A random access device is also provided in this embodiment. FIG. 8 is a structural block diagram of another random access device according to an embodiment of the present disclosure. As shown in FIG. 8, the device includes:

The second receiving module 82 is configured to receive a PDCCH command sent by the master control base station, where The PDCCH command carries the resource identifier of the random access resource allocated by the secondary base station for the user equipment UE and the identifier of the secondary base station, and the PDCCH command is used to indicate that the UE accesses the secondary cell of the secondary base station on the allocated random access resource. The SCell performs random access, and the secondary base station is a base station different from the primary base station including the primary cell PCell of the UE.

The random access module 84 is configured to perform random access to the SCell on the allocated random access resources according to the PDCCH order.

In the embodiment of the present disclosure, the second receiving module 82 receives the PDCCH command sent by the master control base station, and the random access module 84 performs random access on the SCell on the allocated random access resource according to the PDCCH command, which solves the problem in the related art. And the problem that the non-contention random access is implemented on the secondary cell that does not belong to the same base station as the primary cell, and then the first base station is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell, so that the UE can be in the auxiliary station that does not belong to the same base station as the primary cell. The non-contention random access procedure is performed on the cell, thereby effectively ensuring that the UE supports carrier aggregation in the cross-base station scenario, thereby improving the transmission rate of the user plane data.

An embodiment of the present disclosure also provides a base station. The base station includes a primary cell PCell of the user equipment UE, and is configured to determine a secondary base station including the secondary cell SCell of the user equipment UE, and send a first message to the determined secondary base station, where the secondary base station is a primary cell PCell including the UE The base station is different from the base station, and the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell. The base station is another base station different from the secondary base station. Preferably, the base station can be a master base station.

An embodiment of the present disclosure also provides a base station. The base station is configured to receive the first message sent by the master control base station, and perform processing on the secondary cell SCell that the user equipment UE randomly accesses the secondary base station according to the first message, where the first message is further used to trigger random access to the SCell to the UE. Performing processing, the master base station is a base station including a primary cell PCell of the UE, and the master base station is a base station different from the secondary base station of the SCell including the UE. The base station is another base station different from the master base station, and preferably, the base station can be a secondary base station.

The embodiment of the present disclosure further provides a user equipment UE. The UE is configured to receive a PDCCH command sent by the master base station, and perform random access on the secondary cell SCell of the secondary base station according to the PDCCH order on the random access resource allocated by the secondary base station, where the PDCCH command And carrying the resource identifier of the random access resource allocated by the secondary base station for the UE to the secondary base station and the identifier of the secondary base station, where the PDCCH command is used to instruct the UE to perform random access to the SCell on the allocated random access resource, where the secondary base station is A base station different from the master base station including the primary cell PCell of the UE.

The embodiment of the present disclosure also provides a random access system. As shown in FIG. 9, the random access system includes:

User equipment UE 92;

The primary control base station 94 includes a primary cell PCell of the UE, and is configured to determine a secondary base station that includes the secondary cell SCell of the UE, and send a first message to the determined secondary base station, where the first message is used to trigger the secondary base station to randomly connect to the UE. Into the SCell to perform processing;

The secondary base station 96 is a base station different from the primary control base station, and is configured to perform processing on the UE randomly accessing the SCell according to the first message.

In the embodiment of the present disclosure, the secondary base station 96 including the secondary cell SCell of the UE 92 is determined by the primary control base station 94, and the first message is sent to the determined secondary base station 96, and the secondary base station 96 performs processing on the UE randomly accessing the SCell according to the first message. The invention solves the problem that the non-contention random access cannot be implemented on the secondary cell that does not belong to the same base station as the primary cell in the related art, and then the first base station triggers the secondary base station to perform processing on the UE randomly accessing the SCell, so that the UE can be in the The non-contention random access procedure is performed on the secondary cell in which the primary cell does not belong to the same base station, thereby effectively ensuring that the UE supports carrier aggregation in the cross-base station scenario, thereby improving the transmission rate of the user plane data.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

Embodiments of the present disclosure also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S102. Determine a secondary base station that includes a secondary cell SCell of the user equipment UE, where the secondary base station is a base station different from the primary control base station that includes the primary cell PCell of the UE.

S104. Send a first message to the determined secondary base station, where the first message is used to trigger the auxiliary The assisting base station performs processing on the UE randomly accessing the SCell.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S202. The first message sent by the master control base station is received, where the first message is further used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the primary control base station is a base station including the primary cell PCell of the UE, and the primary control base station a base station that is different from the secondary base station of the SCell including the UE;

S204. Perform processing on the UE randomly accessing the SCell according to the first message.

S302. Receive a PDCCH command sent by the master control base station, where the PDCCH command carries the resource identifier of the random access resource allocated by the secondary device to the user equipment UE and the identifier of the secondary base station, where the PDCCH command is used to indicate that the UE is The allocated random access resources perform random access on the secondary cell SCell of the secondary base station, and the secondary base station is a base station different from the primary control base station including the primary cell PCell of the UE.

S304. Perform random access on the SCell on the allocated random access resource according to the PDCCH order.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

For example, the examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the present disclosure is not limited to any special The combination of hardware and software.

The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the disclosure, and various changes and modifications may be made to the present disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Industrial applicability

Claims

A random access method, including:

Determining a secondary base station including a secondary cell SCell of the user equipment UE, wherein the secondary base station is a base station different from a primary control base station including a primary cell PCell of the UE;

Sending a first message to the determined secondary base station, where the first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell.
The method according to claim 1, wherein the first message is further configured to trigger the secondary base station to allocate random access resources for the UE to randomly access the SCell.
The method according to claim 2, wherein the first message carries a random access resource range that is allowed to be used by the secondary base station, and the first message is further used to trigger the secondary base station to be in the random connection. The UE randomly allocates random access resources to the SCell within the inbound resource range.
The method of claim 1, further comprising: after transmitting the first message to the determined secondary base station, further comprising:

Receiving a second message sent by the secondary base station, where the second message carries at least one of the following information:

a resource identifier for identifying a random access resource allocated by the secondary base station for performing random access for the UE; indicating indication information that the secondary base station allows the UE to perform random access; Incoming Random Access - The wireless network temporary identity RA-RNTI.
The method of claim 4, after receiving the second message sent by the secondary base station, further comprising:

Determining, according to the second message, whether the random access resource allocated by the secondary base station for random access by the UE is available;

When it is determined that the random access resource allocated by the secondary base station for the random access of the UE is available, the UE is instructed to perform random access to the SCell on the allocated random access resource;

And determining, in the case that the random access resource allocated by the secondary base station for the random access of the UE is unavailable, sending a first random access reject message to the secondary base station, where the first random access The incoming reject message is used to indicate that the secondary base station re-allocates random access resources for the UE to randomly access the secondary base station.
The method according to claim 5, wherein the first random access reject message carries a random access resource range that is allowed to be used by the secondary base station, and the first random access reject message is used to indicate the The secondary base station re-allocates the random access resource for the UE to randomly access the secondary base station within the random access resource range.
The method according to claim 5, wherein the resource identifier includes a random access preamble sequence index, and determining, according to the second message, whether the random access resource allocated by the secondary base station for performing random access for the UE is Available includes at least one of the following:

Determining whether the random access resource corresponding to the random access preamble sequence index is used to indicate a non-contention random access preamble sequence resource in the PCell;

Determining whether the random access preamble sequence index and the RA-RNTI are simultaneously allocated for use by other UEs.
The method of claim 5, wherein instructing the UE to perform random access on the SCell on the allocated random access resource comprises:

And sending, to the UE, a physical downlink control channel (PDCCH) command, where the PDCCH command carries the resource identifier and the identifier of the secondary base station, and is used to indicate that the UE is located on the allocated random access resource. The SCell of the secondary base station performs random access.
The method of claim 8, wherein the transmitting the physical downlink control channel PDCCH order to the UE comprises:

Instructing the secondary base station to send the PDCCH order to the UE.
The method according to claim 8 or 9, wherein after the sending the PDCCH command to the UE, the method further includes:

Receiving a first random access response sent by the secondary base station, where the first random access response carries a first sending moment that indicates that the primary control base station sends a second random access response to the UE, And at least one of the following parameters: an uplink transmission timing advance, a backoff parameter, a random access preamble sequence index, an uplink scheduling grant corresponding to an uplink resource allocated to the UE, and a cell wireless network temporary identifier;

Determining whether the first sending moment is a moment with available PDCCH resources;

When it is determined that the first sending moment is a time with an available PDCCH resource, the second random access response is sent to the UE at the first sending moment.
The method of claim 10, further comprising:

Transmitting, to the secondary base station, a third message, where the third message carries a time with an available PDCCH resource, to assist the secondary base station to select the first sending moment from the time of having the available PDCCH resource .
The method according to claim 8, wherein the second message further comprises a second sending moment for instructing the master base station to send the PDCCH order to the UE, and sending the PDCCH order to the UE include:

Determining whether the second transmission time is a time having an available PDCCH resource;

When it is determined that the second transmission time is a time having an available PDCCH resource, the PDCCH command is sent to the UE at the second transmission time.
The method according to claim 12, wherein the first message carries a time with available PDCCH resources, and is used to assist the secondary base station to select the second one of the times with the available PDCCH resources. Send time.
The method according to claim 12, wherein, in the case that it is determined that the second transmission time is not the moment with the available PDCCH resources, the method further includes:

Sending the first random access reject message to the secondary base station, where the first random access reject message further carries a moment with an available PDCCH resource, where the first random access reject message is further used Instructing the secondary base station to select a time having an available PDCCH resource as the second transmission time.
A random access method, including:

Receiving a first message sent by the master control base station, where the first message is used to trigger a process for the user equipment UE to randomly access the secondary cell SCell, where the master control base station is a base station including the primary cell PCell of the UE, The master base station is a base station different from the secondary base station of the SCell including the UE;

Performing processing on the UE randomly accessing the SCell according to the first message.
The method according to claim 15, wherein performing processing on the UE to randomly access the SCell according to the first message comprises:

And allocating a random access resource to the SCell by using the first message to the UE according to the first message.
The method according to claim 16, wherein after receiving the first message sent by the master base station, the method further includes:

Sending a second message to the primary control base station, where the second message carries at least one of the following information:

a resource identifier used to identify a random access resource that is randomly allocated to the SCell by the UE; indicating indication information that allows the UE to randomly access the SCell; and used to identify the UE to perform random access Random Access - The wireless network temporary identity RA-RNTI.
The method of claim 17, wherein after the sending the second message to the master base station, the method further comprises:

Receiving, by the primary control base station, a third message indicating that the allocated random access resource is available;

Sending a physical downlink control channel (PDCCH) command to the UE, where the PDCCH command carries the resource identifier, and is used to indicate that the UE performs random access to the SCell on the allocated random access resource.
The method of claim 18, further comprising: after transmitting the physical downlink control channel PDCCH command to the UE,

Sending a first random access response to the primary control base station to indicate that the primary control base station sends a second random access response to the UE at a first sending moment, where the first random access response carries And the first sending time that indicates that the primary control base station sends the second random access response to the UE, and at least one of the following parameters: an uplink transmission timing advance amount, a backoff parameter, and a random access preamble sequence The index, the uplink scheduling grant corresponding to the uplink resource allocated by the UE, and the temporary identifier of the cell radio network.
A random access method, including:

Receiving a PDCCH command sent by the master control base station, where the PDCCH command carries a resource identifier of a random access resource allocated by the secondary base station for the user equipment UE to access the secondary base station, and an identifier of the secondary base station, where the PDCCH is Commanding to indicate, by the UE, the secondary cell of the secondary base station on the allocated random access resource The SCell performs random access, and the secondary base station is a base station different from the primary control base station including the primary cell PCell of the UE;

Performing random access on the SCell on the allocated random access resources according to the PDCCH order.
A storage medium is applied to a base station of a primary cell PCell including a user equipment UE, and the storage medium includes a stored program, wherein, when the program is running, the device in which the storage medium is located is executed to execute the following steps:

Determining a secondary base station of the secondary cell SCell including the user equipment UE, and transmitting a first message to the determined secondary base station, where the secondary base station is a base station different from the primary control base station including the primary cell PCell of the UE, The first message is used to trigger the secondary base station to perform processing on the UE randomly accessing the SCell.
A storage medium is applied to a base station, the storage medium comprising a stored program, wherein when the program is running, the device in which the storage medium is located is controlled to execute the following steps:

Receiving a first message sent by the master control base station, and performing processing on the secondary cell SCell of the user equipment UE randomly accessing the secondary base station according to the first message, where the first message is used to trigger random access to the UE The SCell performs processing, the primary control base station is a base station including a primary cell PCell of the UE, and the primary control base station is a base station different from a secondary base station including an SCell of the UE.
A storage medium is applied to a user equipment UE, and the storage medium includes a stored program, wherein a program code for controlling a device where the storage medium is located to perform the following steps when the program is running:

Receiving a PDCCH command sent by the master base station, and performing, on the random access resource allocated by the secondary base station, the secondary cell SCell of the secondary base station according to the PDCCH command a random access, where the PDCCH command carries a resource identifier of a random access resource allocated by the secondary base station for the UE to randomly access the secondary base station, and an identifier of the secondary base station, where the PDCCH command is used to indicate The UE performs random access to the SCell on the allocated random access resource, and the secondary base station is a base station different from the primary base station including the primary cell PCell of the UE.
A random access system comprising:

User equipment UE;

a primary control base station, including a primary cell PCell of the UE, configured to determine a secondary base station including a secondary cell SCell of the UE, and send a first message to the determined secondary base station, where the first message is used Triggering the secondary base station to perform processing on the UE randomly accessing the SCell;

The secondary base station is a base station different from the primary control base station, and is configured to perform processing on the UE randomly accessing the SCell according to the first message.