WO2014015794A1

WO2014015794A1 - Method, user equipment and base station for obtaining uplink grant

Info

Publication number: WO2014015794A1
Application number: PCT/CN2013/079913
Authority: WO
Inventors: 常俊仁
Original assignee: 华为技术有限公司
Priority date: 2012-07-23
Filing date: 2013-07-23
Publication date: 2014-01-30
Also published as: CN103582143B; CN103582143A

Abstract

The embodiments of the present invention provide a method, user equipment and base station for obtaining uplink grant. The method comprises the following steps: sending a random access preamble to a first base station(BS) when need to request uplink grant to a second BS; receiving a Random Access Response(RAR) message from the first BS; sending a uplink grant distribute indication to the first BS according to the RAR message, so that the first BS sends the uplink grant distribute indication to the second BS; receiving the uplink grant from the second BS. The embodiments of the present invention resolve problems of the user equipment that can not obtain uplink grant.

Description

Method for obtaining uplink grant, user equipment and base station The present application claims to be filed on July 23, 2012 with the Chinese Patent Office, the application number is 201210255879.5, and the invention is entitled "Method for obtaining uplink grant, user equipment and base station" Priority is hereby incorporated by reference in its entirety. Technical field

The embodiments of the present invention relate to the field of wireless communication technologies, and more specifically, to acquiring an uplink grant (Uplink Grant) method, a user equipment, and a base station. Background technique

With the development of mobile communication technology, the transmission rate and service quality that the system can provide are getting higher and higher, and the user service also puts higher and higher requirements on the transmission rate. In order to ensure that the rate of general users, while providing higher throughput for the part of the user, while avoiding a substantial increase in the bandwidth configuration Third Generation Partnership Project ^{(3 rd Generation Partnership Project, 3GPP} ) introduces a carrier aggregation (Carrier Aggregation, CA) technology, which is mainly used by user equipment (User Equipment, UE) to simultaneously perform uplink and downlink communication using multiple component carriers (CCs) to support high-speed transmission.

At the same time, a scheme for separating the control surface from the user plane is proposed. The main idea of the scheme is that the first base station performs wide coverage and is responsible for controlling the plane connection. The carrier on the second base station does not broadcast system information and public information, but is only responsible for the enhancement of the data plane. The second base station mainly performs transmission of user data, and does not perform scheduling of public information, that is, there is no Common Search Space (CSS) for scheduling public information. Therefore, the high frequency carrier on the second base station may only have a UE-specific Search Space (USS) for scheduling of UE-specific data. Further, since the transmission between the first base station and the second base station has a certain delay, in order to reduce the feedback delay and ensure the timeliness of scheduling, the uplink primary serving cell, that is, the carrier used for uplink feedback, needs to be selected as the first The high frequency carrier of the second base station; the downlink primary serving cell, that is, the carrier for downlink mobility management and reception of common information, is selected as the carrier of the first base station. That is, the uplink primary serving cell is the carrier from the second base station, and the downlink primary serving cell is the carrier from the first base station. The second base station is located in the coverage of the first base station, and the coverage of the second base station is smaller than the first base station. Since the second base station does not send the scheduling information of the downlink public information, it is required to solve the problem that the UE needs to request the uplink grant when there is no uplink grant. Summary of the invention

The embodiment of the invention provides a method for acquiring an uplink grant, a user equipment, and a base station. Used to solve

The UE cannot obtain the issue of the uplink grant.

In an aspect, the embodiment of the present invention provides a method for obtaining an uplink grant, including: when requesting an uplink grant from a second base station, sending a random access preamble to the first base station; and receiving a random access response from the first base station ( a random access response (RAR) message, the RAR message is sent by the first base station according to the random access preamble; according to the RAR message, an uplink grant allocation indication is sent to the first base station, so that the first base station grants the uplink grant allocation Sending an indication to the second base station, the uplink grant allocation indication is used to instruct the UE to request an uplink grant from the second base station; receiving an uplink grant from the second base station, where the uplink grant is sent by the second base station according to the uplink grant allocation indication . The at least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE; the at least one component carrier of the second base station corresponds to an uplink primary serving cell of the UE; and the second base station is located at the first base station Coverage. The requesting the uplink grant to the second base station includes: if the second base station does not send the resource of the scheduling request, requesting the uplink grant from the second base station; or if the number of times the scheduling request is sent by the second base station is reached For the preset maximum number of transmissions, an uplink grant needs to be requested from the second base station. The uplink grant allocation indication is an uplink grant allocation request or a cache status report. The UE sends the random access preamble to the first base station from an uplink carrier associated with System Information Block 2 (SIB2) of the downlink primary serving cell.

In another aspect, the embodiment of the present invention provides a method for acquiring an uplink grant, including: receiving, by a first base station, a random access preamble from a UE; the first base station sending, by using the random access preamble, a RAR message to the UE; Receiving, by the base station, an uplink grant allocation indication, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant to the second base station; and the first base station sends the uplink grant allocation indication to the second base station, so that the second base station And sending an uplink grant to the UE according to the uplink grant allocation indication. At least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE; at least one component carrier of the second base station corresponds to an uplink primary serving cell of the UE; and the second base station is located at the first base station Coverage. The uplink grant allocation indication is an uplink grant allocation request or a cache status report. The first base station from the downlink primary serving cell The random access preamble is received on the uplink carrier associated with the SIB2.

On the other hand, the embodiment of the present invention provides a method for obtaining an uplink grant, where: the second base station receives, from the first base station, an uplink grant allocation indication sent by the UE to the first base station, where the uplink grant allocation indication is used to indicate the The UE requests an uplink grant from the second base station; the second base station sends an uplink grant to the UE according to the uplink grant allocation indication. At least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE; at least one component carrier of the second base station corresponds to an uplink primary serving cell of the UE; and the second base station is located at the first base station Coverage. The uplink grant allocation indication is an uplink grant allocation request or a cache status report.

On the other hand, an embodiment of the present invention provides a user equipment, including: a control module, configured to determine that the UE needs to request an uplink grant; and a sending module, configured to: when the control module determines that the UE needs to request the uplink grant, to a base station sends a random access preamble; the receiving module is configured to receive a RAR message from the first base station, where the RAR message is sent by the first base station according to the random access preamble; and the sending module is further configured to: according to the RAR message, Sending an uplink grant allocation indication to the first base station, so that the first base station sends the uplink grant allocation indication to the second base station, where the uplink grant allocation indication is used to instruct the UE to request an uplink grant from the second base station; And receiving, by the second base station, an uplink grant, where the uplink grant is sent by the second base station according to the uplink grant allocation indication. Further, the control module is further configured to: if the UE does not send the resource of the scheduling request at the second base station, determine that the UE needs to request an uplink grant from the second base station. Further, the UE further includes: a counting module, configured to calculate a number of times that the UE sends a scheduling request at the second base station; the control module is further configured to: according to the counting module, the UE sends a scheduling request at the second base station The number of times, if the number of times the scheduling request is sent by the second base station reaches a preset maximum number of transmissions, it is determined that the UE needs to request the uplink grant from the second base station. At least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE; at least one component carrier of the second base station corresponds to an uplink primary serving cell of the UE; and the second base station is located at the first base station Coverage.

In another aspect, the embodiment of the present invention provides a base station, including: a sending module, configured to receive a random access preamble from a UE, and a sending module, configured to send, according to the random access preamble, a RAR message to the UE; the receiving module And receiving, by the UE, an uplink grant allocation indication, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant to the second base station; and the sending module is further configured to send the uplink grant allocation indication to the second base station, where So that the second base station sends an uplink grant to the UE according to the uplink grant allocation indication. Wherein at least one component carrier of the base station corresponds to the UE The downlink primary serving cell; the at least one component carrier of the second base station corresponds to the uplink primary serving cell of the UE.

In another aspect, an embodiment of the present invention provides a base station, including: a receiving module, configured to receive, by a first base station, an uplink grant allocation indication sent by the UE to the first base station, where the uplink grant allocation indication is used to indicate the UE The base station requests an uplink grant; the sending module is configured to send an uplink grant to the UE according to the uplink grant allocation indication. The at least one component carrier of the base station corresponds to an uplink primary serving cell of the UE; and the at least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE.

In the embodiment of the present invention, the UE sends an uplink grant allocation indication to the first base station, and the first base station sends the uplink grant allocation indication to the second base station, so that the second base station sends an uplink grant to the UE according to the uplink grant allocation indication. , solves the problem that the UE cannot obtain the uplink grant.

Embodiments of the present invention also provide a method for restoring synchronization, a user equipment, and a base station. It is used to solve the problem that the UE resumes synchronization when a radio link fails.

In an aspect, the embodiment of the present invention provides a method for restoring synchronization, including: when a UE fails to generate a radio link in its first uplink primary serving cell, transmitting a random access preamble to the first base station; receiving from the first base station a RAR message, the RAR message is sent by the first base station according to the random access preamble; according to the RAR message, an out-of-synchronization indication is sent to the first base station, where the out-of-synchronization indication is used to indicate that the radio link fails; A base station receives a change indication, and the change indication is sent by the first base station according to the out-of-synchronization indication, and is used to indicate a second uplink primary serving cell of the UE. The second component carrier of the second base station corresponds to the first uplink primary serving cell; the third component carrier of the second base station or the fourth component carrier of the third base station corresponds to the second uplink primary service d and the area; The first component carrier of the first base station corresponds to a downlink primary serving cell; the second base station and/or the third base station is located within the coverage of the first base station. The UE sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell.

In another aspect, an embodiment of the present invention provides a method for restoring synchronization, including:

The UE receives a random access preamble; the first base station sends an RAR message to the UE according to the random access preamble; the first base station receives an out-of-synchronization indication from the UE, where the out-of-synchronization indication is used to indicate that the UE is in its first A radio link failure occurs in the uplink primary serving cell; the first base station sends a change indication to the UE according to the out-of-synchronization indication, where the change indication is used to indicate the second uplink primary serving cell of the UE. Further, the first base station sends the out-of-synchronization indication to the second base station or the third base station, so that the second base station or the third base station learns that the UE fails to send a radio link in the first uplink primary serving cell, thereby The second uplink primary serving cell is determined for the UE. Or the first base station determines the second uplink primary serving cell; the first base station sends an uplink primary serving cell change notification to the second base station or the third base station, where the first base station or the third base station is configured to indicate the first The second uplink primary serving cell determined by the base station. The second component carrier of the second base station corresponds to the first uplink primary serving cell; the third component carrier of the second base station or the fourth component carrier of the third base station corresponds to the second uplink primary serving cell; The first component carrier of the first base station corresponds to the downlink primary serving cell of the UE; the second base station and/or the third base station is located within the coverage of the first base station. The first base station receives the random access preamble from an uplink carrier associated with the SIB2 of the downlink primary serving cell.

In another aspect, the embodiment of the present invention provides a user equipment, including: a control module, configured to: if the radio link state of the first uplink primary serving cell fails, determine that the synchronization needs to be restored; The control module is configured to send a random access preamble to the first base station when the synchronization is determined to be restored, and the receiving module is configured to receive, by the first base station, a RAR message, where the RAR message is sent by the first base station according to the random access preamble; The sending module is further configured to send an out-of-synchronization indication to the first base station according to the RAR message, where the out-of-synchronization indication is used to indicate that the radio link fails; and the receiving module is further configured to receive a change indication from the first base station. The change indication is sent by the first base station according to the out-of-synchronization indication, and is used to indicate a second uplink primary serving cell of the UE. The first component carrier of the first base station corresponds to the downlink primary serving cell of the UE, the second component carrier of the second base station corresponds to the first uplink primary serving cell, and the third component carrier of the second base station or the third The fourth component carrier of the three base stations corresponds to the second uplink primary serving cell; the second base station and/or the third base station is located within the coverage of the first base station, and the coverage of the second base station and/or the third base station The range is smaller than the first base station.

In another aspect, an embodiment of the present invention provides a base station, including: a receiving module, configured to receive a random access preamble from a UE, and a sending module, configured to send a random access response RAR message to the UE according to the random access preamble The receiving module is further configured to receive an out-of-synchronization indication from the UE, where the out-of-synchronization indication is used to indicate that the UE fails to generate a radio link in the first uplink primary serving cell; the sending module is further configured to And transmitting, to the UE, a change indication, where the change indication is used to indicate the second uplink primary serving cell of the UE. Further, the sending module is further configured to send the out-of-synchronization indication to the second base station or the third base station, so that the second base station or the third base station learns that the UE fails to send a radio link in the first uplink primary serving cell, And determining, by the UE, the second uplink primary serving cell; or, the base station further includes a determining module, configured to determine the second uplink primary serving cell; the sending module is further configured to send the uplink to the second base station or the third base station Main service area change notice, And the second uplink primary serving cell that is determined by the first base station or the third base station by the first base station. The first component carrier of the first base station corresponds to the downlink primary serving cell of the UE, the second component carrier of the second base station corresponds to the first uplink primary serving cell, and the third component carrier of the second base station or the third The fourth component carrier of the three base stations corresponds to the second uplink primary serving cell; the second base station and/or the third base station is located within the coverage of the first base station, and the coverage of the second base station and/or the third base station The range is smaller than the first base station.

In the embodiment of the present invention, when the UE fails to generate a radio link in the first uplink primary serving cell, the UE sends an out-of-synchronization indication to the first base station, and receives a change indication from the first base station, where the change indication is used to indicate the The second uplink primary serving cell of the UE solves the problem that the UE resumes synchronization when a radio link fails. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

FIG. 1 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention.

FIG. 4 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention.

FIG. 5 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention.

FIG. 6 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention.

FIG. 7 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention.

FIG. 8 is a schematic block diagram of a user equipment according to an embodiment of the present invention.

9 is a schematic block diagram of a base station in accordance with an embodiment of the present invention.

FIG. 10 is a schematic block diagram of another base station according to an embodiment of the present invention.

11 is a schematic block diagram of another user equipment in accordance with an embodiment of the present invention.

Figure 12 is a schematic block diagram of another base station in accordance with an embodiment of the present invention. detailed description

The technical solution in the embodiment of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. The invention is clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, and wideband code. Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) System, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), etc.

The UE may also be referred to as a mobile terminal (MT), a mobile user equipment, etc., and may communicate with one or more core networks via a radio access network (eg, Radio Access Network, RAN), and the user equipment may be mobile. A terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.

The base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an eNB or an e-NodeB in LTE, and the present invention is not limited thereto.

FIG. 1 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention. The method of Figure 1 is performed by the UE.

And transmitting, by the second base station, the random access preamble to the first base station, where the at least one component carrier of the first base station corresponds to the downlink primary serving cell of the UE, and the at least one component carrier of the second base station Corresponding to the uplink primary serving cell of the UE. The random access preamble is sent to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The SIB2 associated uplink carrier of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value. 120. Receive an RAR message from the first base station. The RAR message is sent by the first base station according to the random access preamble sent by the UE.

130. Send, according to the RAR message, an uplink grant allocation indication to the first base station, so that the first base station sends the uplink grant allocation indication to the second base station, where the uplink grant allocation indication is used to indicate that the UE is to the second base station. The base station requests an uplink grant.

140. Receive an uplink grant from the second base station.

The second base station is located in the coverage of the first base station, and the coverage of the second base station is smaller than the first base station.

FIG. 2 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention. The method of Figure 2 is performed by a first base station, at least one component carrier of which corresponds to a downlink primary serving cell of the UE.

210. Receive a random access preamble from the UE. The random access preamble is received from an uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

220. Send a RAR message to the UE according to the random access preamble.

230. Receive an uplink grant allocation indication from the UE, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant from the second base station.

The uplink grant grant indication is sent to the second base station, so that the second base station sends an uplink grant to the UE according to the uplink grant allocation indication, where at least one component carrier of the second base station corresponds to an uplink primary service of the UE. Community.

In the embodiment of the present invention, the first base station receives an uplink grant allocation indication from the UE, and sends the uplink grant allocation indication to the second base station, so that the second base station sends the uplink grant allocation indication to the second base station. The UE sends an uplink grant, which solves the problem that the UE cannot obtain the uplink grant.

FIG. 3 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention. The method of Figure 3 is performed by a second base station, at least one component carrier of which corresponds to an uplink primary serving cell of the UE.

And receiving, by the first base station, an uplink grant allocation indication sent by the UE to the first base station, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant to the second base station, where at least one component of the first base station The carrier corresponds to the downlink primary serving cell of the UE.

320. Send an uplink grant to the UE according to the uplink grant allocation indication.

In the embodiment of the present invention, the second base station receives an uplink grant allocation indication sent by the first base station, where the uplink grant allocation indication is sent by the UE to the first base station; and the second base station sends an uplink grant to the UE according to the uplink grant allocation indication. , solves the problem that the UE cannot obtain the uplink grant.

FIG. 4 is a schematic flowchart of a method for obtaining an uplink grant according to an embodiment of the present invention. As shown in FIG. 4, at least one component carrier of the first base station corresponds to a downlink primary serving cell of the UE, and is used for receiving, by the UE, system information, updating system information, receiving a paging message, and controlling whether the UE performs handover or the like; At least one component carrier of the second base station corresponds to an uplink primary serving cell of the UE, and is used for performing feedback on whether downlink data has been correctly received, feedback of channel state information, and the like. The second base station is located in the coverage of the first base station, and the coverage of the second base station is smaller than the first base station.

410. The UE needs to request an uplink grant from the second base station.

The requesting the uplink grant to the second base station includes: if the UE does not send the resource of the scheduling request in the second base station, the UE needs to request the uplink grant from the second base station; or, if the UE is in the second base station The number of times the scheduling request is sent reaches a preset maximum number of transmissions, and the UE needs to request an uplink grant from the second base station.

420. When the UE needs to request the uplink grant from the second base station, the UE sends a random access preamble to the first base station.

The UE sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carrying the uplink corresponding to the downlink primary serving cell The information of the wave, for example, the frequency information of the uplink carrier, or the like; or if the information of the uplink carrier is not carried by the SIB2 of the downlink primary serving cell, the information about the uplink carrier corresponding to the downlink primary serving cell is obtained according to a preset value, For example, the frequency information of the uplink carrier, and the like.

430. The first base station receives the random access preamble from the UE, and sends a RAR message to the UE according to the random access preamble.

The first base station receives the random access preamble from an uplink carrier associated with the SIB2 of the downlink primary serving cell.

440. The UE receives the RAR message from the first base station, and sends an uplink grant allocation indication to the first base station according to the RAR message, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant from the second base station.

The uplink grant allocation indication includes: an uplink grant allocation request, which is used to indicate that the UE needs to request an uplink grant from the second base station; or a buffer status report, where the cache status report includes the cache state information of the UE. And sending, according to the RAR message, the uplink grant allocation indication to the first base station, according to the uplink resource allocated in the RAR message, sending an uplink grant allocation indication to the first base station on the uplink resource.

450. The first base station receives the uplink grant allocation indication from the UE, and sends the uplink grant allocation indication to the second base station.

The first base station may forward the uplink grant allocation indication to the second base station or send the processed uplink grant allocation indication to the second base station, so that the second base station sends the uplink grant allocation indication to the second base station according to the uplink grant allocation indication. Upgrading.

460. The second base station receives the uplink grant allocation indication from the first base station, and sends an uplink grant to the UE according to the uplink grant allocation indication.

FIG. 5 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention. The method of Figure 5 is performed by the UE.

510. When the UE fails to generate a radio link in the first uplink primary serving cell, the UE sends a random access preamble to the first base station, where the first component carrier of the first base station corresponds to the downlink primary serving cell of the UE. The UE sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The downlink primary serving cell is associated with the SIB2 The row carrier corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

520. Receive a RAR message from the first base station. The RAR message is sent by the first base station according to the random access preamble.

530. Send an out-of-synchronization indication to the first base station. The out-of-synchronization indication is used to indicate that the UE has a radio link failure in the first uplink main service d, where the second component carrier of the second base station corresponds to the first uplink primary serving cell.

540. Receive a change indication from the first base station. The change indication is that the first base station transmits according to the out-of-synchronization indication. The change indication is used to indicate the second uplink primary serving cell of the UE, where the second uplink primary serving cell may be the uplink primary serving cell corresponding to the third component carrier of the second base station or the fourth component carrier corresponding to the third base station. The uplink primary serving cell. The second base station and/or the third base station are located in the coverage of the first base station, and the coverage of the second base station and/or the third base station is smaller than the first base station.

In the embodiment of the present invention, when the UE fails to generate a radio link in the first uplink primary serving cell, the UE sends an out-of-synchronization indication to the first base station, and receives a change indication from the first base station, where the change indication is used to indicate the The second uplink primary serving cell of the UE solves the problem that the UE resumes synchronization when a radio link fails.

FIG. 6 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention. The method of Figure 6 is performed by a first base station whose first component carrier corresponds to the downlink primary serving cell of the UE.

610. Receive a random access preamble from the UE. The random access preamble is received from an uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

620. Send a RAR message to the UE according to the random access preamble. 630. Receive an out-of-synchronization indication from the UE. The out-of-synchronization indication is used to indicate that the UE has a radio link failure in its first uplink primary serving cell. The second component carrier of the second base station corresponds to the first uplink primary serving cell.

640. Send, according to the out-of-synchronization indication, a change indication to the UE, where the change indication is used to indicate a second uplink primary serving cell of the UE. The second uplink primary serving cell may be corresponding to the third component carrier of the second base station or the fourth component carrier of the third base station. The second base station and/or the third base station are located within the coverage of the first base station, and the coverage of the second base station and/or the third base station is smaller than the first base station.

650. The first base station sends an out-of-synchronization indication to the second base station or the third base station; or

Determining, by the first base station, the second uplink primary serving cell, and sending an uplink primary serving cell change notification to the second base station or the third base station, where the second base station or the third base station determines the first base station Two uplink primary service cells.

In the embodiment of the present invention, when the UE fails to generate a radio link in the first uplink primary serving cell, the first base station receives the out-of-synchronization indication sent by the UE, and sends a change indication to the UE, where the change indication is used. The second uplink primary serving cell indicating the UE solves the problem that the UE resumes synchronization when a radio link fails.

FIG. 7 is a schematic flowchart of a method for restoring synchronization according to an embodiment of the present invention. The second base station is located in the coverage of the first base station, and the coverage of the second base station is smaller than the first base station.

710. The UE needs to resume synchronization. If the UE fails a wireless link in its first uplink primary serving cell, then synchronization needs to be resumed.

The second component carrier of the second base station corresponds to the first uplink primary serving cell of the UE, and is used to perform feedback on whether downlink data has been correctly received, feedback of channel state information, and the like.

720. The UE sends a random access preamble to the first base station.

The first component carrier of the first base station corresponds to the downlink primary serving cell of the UE, and is used for receiving, by the UE, system information, updating system information, receiving a paging message, and controlling whether the UE performs handover or the like. The UE sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; or If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, obtain the pair with the downlink primary serving cell according to the preset value. The information of the uplink carrier to be used, for example, the frequency information of the uplink carrier.

730. The first base station receives the random access preamble, and sends a RAR message to the UE according to the random access preamble.

740. The UE receives the RAR message, and sends an out-of-synchronization indication to the first base station according to the RAR message, where the out-of-synchronization indication is used to indicate that the UE fails to generate a wireless link in the first uplink primary serving cell.

750, the first base station receives the out-of-synchronization indication, and sends a change indication to the UE according to the out-of-synchronization indication, where the change indication is used to indicate that the second uplink primary serving cell of the UE is configured to perform whether the downlink data is correct. Received feedback, feedback of channel status information, etc. The third component carrier of the second base station corresponds to the second uplink primary serving cell. Optionally, the third base station may further include a third component carrier, where the fourth component carrier of the third base station corresponds to the second uplink primary serving cell. The third base station is located in the coverage of the first base station, and the coverage of the third base station is smaller than the first base station.

760, the first base station may send the out-of-synchronization indication to the second base station, so that the second base station learns that the UE fails to generate a radio link in the first uplink primary serving cell, thereby determining the second uplink master for the UE. a serving cell, wherein a component carrier corresponding to the second uplink primary serving cell is a third component carrier of the second base station. The out-of-synchronization indication may also include identification information of the UE. Optionally, the first base station may further determine the second uplink primary serving cell, where the component carrier corresponding to the second uplink primary serving cell is a third component carrier of the second base station. The first base station sends an uplink primary serving cell change notification to the second base, and is used to indicate the second uplink primary serving cell determined by the first base station by the second base station.

Or the 770, the first base station may further send the out-of-synchronization indication to the third base station, so that the third base station learns that the UE fails to generate a radio link in the first uplink primary serving cell, thereby determining the second uplink for the UE. a primary serving cell, wherein the component carrier corresponding to the second uplink primary serving cell is a fourth component carrier of the third base station. The out-of-synchronization indication may further include the identifier information of the UE or the identifier information of the UE and the information of the first uplink primary serving cell. Optionally, the first base station may further determine the second uplink primary serving cell, where a component carrier corresponding to the second uplink primary serving cell is a fourth component carrier of the third base station. The first base station sends an uplink primary serving cell change notification to the third base station, and is used to indicate the second uplink primary service determined by the first base station by the third base station. Community. The third base station is located in the coverage of the first base station, and the coverage of the third base station is smaller than the first base station.

The first base station may forward the out-of-synchronization indication or the sent-out out-of-synchronization indication to the second base station or the third base station.

FIG. 8 is a schematic block diagram of a UE 800 in accordance with an embodiment of the present invention. The UE 800 of FIG. 8 may be the UE in FIG. 4 above, and includes: a control module 810, a sending module 820, and a receiving module 830.

Control module 810 determines that UE 800 needs to request an uplink grant.

The sending module 820, when the control module 810 determines that the UE 800 needs to request the uplink grant, sends a random access preamble to the first base station, where the at least one component carrier of the first base station corresponds to the downlink primary serving cell of the UE 800, The UE 800 receives system information, updates system information, receives paging messages, and controls whether the UE 800 performs handover or the like. The sending module 820 sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the SIB2 of the downlink primary serving cell carries information of an uplink carrier corresponding to the downlink primary serving cell, for example, frequency information of the uplink carrier, or the like; If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

The receiving module 830 receives a RAR message from the first base station, where the RAR message is sent by the first base station according to the random access preamble.

The sending module 820 sends an uplink grant allocation indication to the first base station according to the RAR message, where the uplink grant allocation indication is used to instruct the UE 800 to request an uplink grant from the second base station, where the at least one component carrier of the second base station corresponds to the UE 800. The uplink primary serving cell is used to perform feedback on whether downlink data has been correctly received, feedback of channel state information, and the like. The second base station is located within the coverage of the first base station, and the coverage of the second base station is smaller than the first base station. .

The receiving module 830 receives the uplink grant from the second base station.

Optionally, the UE 800 further includes: a counting module 840. The counting module 840 counts the number of times the second base station sends a scheduling request.

If the UE does not send the resource of the scheduling request at the second base station and/or the number of times the counting module 840 sends the scheduling request to the second base station reaches a preset maximum number of transmissions, the control module 810 determines that the UE needs to The second base station requests an uplink grant.

In the embodiment of the present invention, the UE 800 sends an uplink grant allocation indication to the first base station, and the first base station sends the uplink grant allocation indication to the second base station, so that the second base station sends the uplink to the UE 800 according to the uplink grant allocation indication. Granted, solved the problem that UE 800 could not obtain the uplink grant.

Figure 9 is a schematic block diagram of a base station 900 in accordance with an embodiment of the present invention. The base station 900 of FIG. 9 may be the first base station in FIG. 4. The at least one component carrier of the base station 900 corresponds to the downlink primary serving cell of the UE, and is used by the UE to receive system information, update system information, receive paging messages, and Controlling whether the UE performs handover or the like includes: a sending module 910 and a receiving module 920.

The receiving module 920 receives the random access preamble from the UE. The receiving module 920 receives the random access preamble from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the information of the uplink carrier corresponding to the downlink primary serving cell, such as the frequency information of the uplink carrier, etc.; or the downlink If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

The sending module 910 sends a RAR message to the UE according to the random access preamble.

The receiving module 920 receives an uplink grant allocation indication from the UE, and the uplink grant allocation indication is used to instruct the UE to request an uplink grant from the second base station.

The sending module 910 sends the uplink grant allocation indication to the second base station, where the at least one component carrier of the second base station corresponds to the uplink primary serving cell of the UE, and is used to perform feedback, channel state, whether the downlink data has been correctly received. Feedback of information, etc.

The second base station is located in the coverage of the base station 900, and the coverage of the second base station is smaller than the base station 900.

In the embodiment of the present invention, the base station 900 receives an uplink grant allocation indication from the UE, and sends the uplink grant allocation indication to the second base station, so that the second base station sends an uplink grant to the UE according to the uplink grant allocation indication, and the UE cannot be resolved. Get the issue of the upstream grant. FIG. 10 is a schematic block diagram of a base station 1000 in accordance with an embodiment of the present invention. The base station 1000 of FIG. 10 may be the second base station in FIG. 4, and at least one component carrier of the base station 1000 corresponds to an uplink primary serving cell of the UE, and is used for performing feedback on whether downlink data has been correctly received, feedback of channel state information, and the like. The method includes: a sending module 1010 and a receiving module 1020.

The receiving module 1020 receives, from the first base station, an uplink grant allocation indication sent by the UE to the first base station, where the uplink grant allocation indication is used to indicate that the UE requests an uplink grant from the second base station, where at least one component of the first base station The carrier corresponds to the downlink primary serving cell of the UE, and is used for receiving, by the UE, system information, updating system information, receiving a paging message, and controlling whether the UE performs handover or the like.

The base station 1000 is located in the coverage of the first base station, and the coverage of the base station 1000 is smaller than the first base station.

The sending module 1010 is configured to send an uplink grant to the UE according to the uplink grant allocation indication. In the embodiment of the present invention, the base station 1000 receives an uplink grant allocation indication sent by the first base station, where the uplink grant allocation indication is sent by the UE to the first base station; and the base station 1000 sends an uplink grant to the UE according to the uplink grant allocation indication, which is solved. The UE is unable to obtain the issue of the uplink grant.

Figure 11 is a schematic block diagram of a UE 1100 in accordance with an embodiment of the present invention. The UE 1100 of FIG. 11 may be the UE in FIG. 7, and includes: a control module 1110, a sending module 1120, and a receiving module 1130.

The control module 1110 determines that the UE 1100 needs to resume synchronization when the radio link fails in the first uplink primary serving cell, where the second component carrier of the second base station corresponds to the first uplink primary serving cell, and is configured to perform Whether the downlink data has been correctly received feedback, feedback of channel state information, and the like.

The sending module 1120, when the control module 1110 determines that the synchronization needs to be restored, sends a random access preamble to the first base station, where the first component carrier of the first base station corresponds to the downlink primary serving cell of the UE 1100, and is used by the UE 1100 receiving system. Information, update system information, receive paging messages, and control whether the UE 1100 performs handover or the like. The sending module 1120 sends the random access preamble to the first base station from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the information of the uplink carrier corresponding to the downlink primary serving cell, such as the frequency information of the uplink carrier, etc.; or the downlink If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell is obtained according to a preset value, for example, the uplink carrier. Frequency information, etc.

The receiving module 1130 receives a RAR message from the first base station, where the RAR message is sent by the first base station according to the random access preamble.

The sending module 1120 sends an out-of-synchronization indication to the first base station, where the out-of-synchronization indication is used to indicate that the wireless link fails.

The receiving module 1130 receives a change indication from the first base station, where the change indication is sent by the first base station according to the out-of-synchronization indication, where the change indication is used to indicate a second uplink primary serving cell of the UE 1100, where the second base station The third component carrier or the fourth component carrier of the third base station corresponds to the second uplink primary serving cell, and is used for performing feedback on whether downlink data has been correctly received, feedback of channel state information, and the like. The second base station and/or the third base station are located within the coverage of the first base station, and the coverage of the second base station and/or the third base station is smaller than the first base station.

In the embodiment of the present invention, when the UE 1100 fails to generate a radio link in the first uplink primary serving cell, the UE 1100 sends an out-of-synchronization indication to the first base station, and receives a change indication from the first base station, where the change indication is used to indicate The second uplink primary serving cell of the UE 1100 solves the problem that the UE 1100 resumes synchronization when a radio link fails.

Figure 12 is a schematic block diagram of a base station 1200 in accordance with an embodiment of the present invention. The base station 1200 of FIG. 12 may be the first base station in FIG. 7. The first component carrier of the base station 1200 corresponds to the downlink primary serving cell of the UE, and is used by the UE to receive system information, update system information, receive paging messages, and Controlling whether the UE performs handover or the like includes: a sending module 1210 and a receiving module 1220.

The receiving module 1220 receives a random access preamble from the UE. The receiving module 1220 receives the random access preamble from the uplink carrier associated with the SIB2 of the downlink primary serving cell. The uplink carrier associated with the SIB2 of the downlink primary serving cell corresponds to the downlink primary serving cell. The case of the uplink carrier associated with the SIB2 of the downlink primary serving cell may include: the information of the uplink carrier corresponding to the downlink primary serving cell, such as the frequency information of the uplink carrier, etc.; or the downlink If the SIB2 of the primary serving cell does not carry the information of the uplink carrier, the information about the uplink carrier corresponding to the downlink primary serving cell, for example, the frequency information of the uplink carrier, is obtained according to a preset value.

The sending module 1210 sends a RAR message to the UE according to the random access preamble.

The receiving module 1220 receives an out-of-synchronization indication from the UE, where the out-of-synchronization indication is used to indicate that the UE has a radio link failure in its first uplink primary serving cell, and the second component carrier of the second base station corresponds to the first uplink primary service. a cell, where the first uplink primary serving cell is configured to perform downlink data Feedback received correctly, feedback of channel status information, etc. The second base station is located in the coverage of the base station 1200, and the coverage of the second base station is smaller than the base station 1200.

The sending module 1210, according to the out-of-synchronization indication, sends a change indication to the UE, where the change indication is used to indicate a second uplink primary serving cell of the UE, and the second uplink primary serving cell is configured to perform whether the downlink data has been correctly received. Feedback, feedback on channel status information, etc. .

Optionally, the sending module 1210 is further configured to send the out-of-synchronization indication to the second base station, so that the second base station learns that the UE fails to generate a radio link in the first uplink primary serving cell, thereby determining the first The second uplink primary serving cell, wherein the component carrier corresponding to the second uplink primary serving cell is the third component carrier of the second base station. The out-of-synchronization indication may also include identification information of the UE. Optionally, the sending module 1210 may further send the out-of-synchronization indication to the third base station, so that the third base station learns that the UE fails to generate a radio link in the first uplink primary serving cell, thereby determining the second uplink for the UE. a primary serving cell, wherein the component carrier corresponding to the second uplink primary serving cell is a fourth component carrier of the third base station, the third base station is located in a coverage of the base station 1200, and the coverage of the third base station is smaller than the base station 1200. The out-of-synchronization indication may further include the identity information of the UE or the identity information of the UE and the information of the first uplink primary serving cell. The base station 1200 may forward the out-of-synchronization indication or the processed out-of-synchronization indication to the second base station or the third base station.

Alternatively, the base station 1200 may further include a determining module 1230, configured to determine the second uplink primary serving cell, where the second uplink primary serving cell may be an uplink primary serving cell or a third corresponding to the third component carrier of the second base station. The uplink primary serving cell corresponding to the fourth component carrier of the base station. The sending module 1210 is further configured to: if the second uplink primary serving cell is an uplink primary serving cell corresponding to the third component carrier of the second base station, send an uplink primary serving cell change notification to the second base, where The second uplink primary serving cell determined by the second base station 1200; if the second uplink primary serving cell is the uplink primary serving cell corresponding to the fourth component carrier of the third base station, sending the uplink primary service to the third base station The cell change notification is used to indicate the second uplink primary serving cell determined by the third base station base station 1200.

The second uplink primary serving cell is configured to perform feedback on whether downlink data has been correctly received, feedback of channel state information, and the like. The second base station and/or the third base station are located within the coverage of the base station 1200, and the coverage of the second base station and/or the third base station is smaller than the base station 1200.

In the embodiment of the present invention, when the UE fails to generate a radio link in the first uplink primary serving cell, the base station 1200 receives the out-of-synchronization indication sent by the UE, and sends a change indication to the UE. The change indication is used to indicate the second uplink primary serving cell of the UE, and the problem that the UE resumes synchronization when a radio link failure occurs is solved.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute the method of the various embodiments of the present application. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a random access memory (RAM), a disk or an optical disk, and the like, which can store program codes. .

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All modifications are intended to be included within the scope of the invention, and the scope of the invention should be determined by the scope of the appended claims.

Claims

Rights request

A method for obtaining an uplink grant, characterized in that it comprises:

When the uplink grant is requested from the second base station, the random access preamble is sent to the first base station, where the at least one component carrier of the first base station corresponds to the downlink primary serving cell of the user equipment, and the at least one component carrier of the second base station Corresponding to the uplink primary serving cell of the user equipment;

Receiving, by the first base station, a random access response RAR message, where the RAR message is sent by the first base station according to the random access preamble;

And sending, by the first base station, an uplink grant allocation indication, according to the RAR message, that the first base station sends the uplink grant allocation indication to the second base station, where the uplink grant allocation indication is used to indicate the The user equipment requests an uplink grant from the second base station;

And receiving, by the second base station, an uplink grant, where the uplink grant is sent by the second base station according to the uplink grant allocation indication.

2. The method of claim 1 wherein the second base station is located within coverage of the first base station.

The method according to claim 1 or 2, wherein the requesting the uplink grant to the second base station comprises: if the second base station does not send the resource of the scheduling request, the second The base station requests an uplink grant; or

If the number of times the scheduling request is sent by the second base station reaches a preset maximum number of transmissions, the uplink grant needs to be requested from the second base station.

The method according to claim 1, wherein the uplink grant allocation indication is: an uplink grant allocation request or a cache status report.

The method according to claim 1, wherein the transmitting the random access preamble to the first base station comprises: uplinking from the uplink carrier associated with the system information block-2SIB2 of the downlink primary serving cell to the A base station transmits the random access preamble.

6. A method for obtaining an uplink grant, characterized by comprising:

The first base station receives a random access preamble from the user equipment, and the at least one component carrier of the first base station corresponds to the downlink primary serving cell of the user equipment;

Sending, by the first base station, a random access response RAR message to the user equipment according to the random access preamble;

The first base station receives an uplink grant allocation indication from the user equipment, where the uplink grant allocation indication is used to instruct the user equipment to request an uplink grant from the second base station; Sending, by the first base station, the uplink grant allocation indication to the second base station, so that the second base station sends an uplink grant to the user equipment according to the uplink grant allocation indication, where at least one of the second base stations The component carrier corresponds to an uplink primary serving cell of the user equipment.

7. The method of claim 6, wherein the second base station is located within a coverage of the first base station.

The method according to claim 6, wherein the uplink grant allocation indication is: an uplink grant allocation request or a cache status report.

The method according to claim 6, wherein the receiving, by the first base station, the random access preamble from the user equipment comprises: receiving, by the first base station, an uplink carrier associated with the SIB2 of the downlink primary serving cell The random access preamble.

10. A method of obtaining an uplink grant, characterized by comprising:

The second base station receives, from the first base station, an uplink grant allocation indication sent by the user equipment to the first base station, where the uplink grant allocation indication is used to instruct the user equipment to request an uplink grant from the second base station, where At least one component carrier of a base station corresponds to a downlink primary serving cell of the user equipment, and at least one component carrier of the second base station corresponds to an uplink primary serving cell of the user equipment;

The second base station sends an uplink grant to the user equipment according to the uplink grant allocation indication.

The method according to claim 10, wherein the second base station is located within a coverage of the first base station.

12. The method of claim 10, wherein the uplink grant allocation indication is: an uplink grant allocation request or a cache status report.

13. A method for restoring synchronization, comprising:

When the user equipment fails to generate a radio link in the first uplink primary serving cell of the user equipment, the user equipment sends a random access preamble to the first base station, where the first component carrier of the first base station corresponds to the downlink of the user equipment. a primary serving cell, a second component carrier of the second base station corresponding to the first uplink primary serving cell;

And sending, according to the RAR message, an out-of-synchronization indication to the first base station, where the out-of-synchronization indication is used to indicate that the radio link fails; Receiving, by the first base station, a change indication, where the change indication is used to indicate a second uplink primary serving cell of the user equipment, and a third component carrier of the second base station or a fourth component carrier of the third base station corresponds to The second uplink primary serving cell.

14. The method according to claim 13, wherein the second base station and/or the third base station are located within the coverage of the first base station.

The method according to claim 13, wherein the random access preamble is sent to the first base station from an uplink carrier associated with the system information block -2SIB2 of the downlink primary serving cell.

16. A method of restoring synchronization, characterized by comprising:

The first base station receives a random access preamble from the user equipment, where the first component carrier of the first base station corresponds to the downlink primary serving cell of the user equipment;

The first base station receives an out-of-synchronization indication from the user equipment, where the out-of-synchronization indication is used to indicate that the user equipment fails to generate a radio link in the first uplink primary serving cell, and the second component carrier of the second base station corresponds to The first uplink primary serving cell;

The first base station sends a change indication to the user equipment according to the out-of-synchronization indication, and is used to indicate a second uplink primary serving cell of the user equipment, a third component carrier or a third base station of the second base station. The fourth component carrier corresponds to the second uplink primary serving cell.

17. The method of claim 16, wherein the second base station and/or the third base station are located within a coverage of the first base station.

The method according to claim 16 or 17, wherein the method further comprises: the first base station transmitting the out-of-synchronization indication to the second base station or the third base station, so that the The second base station or the third base station learns that the user equipment fails to generate a radio link in the first uplink primary serving cell, thereby determining the second uplink primary serving cell for the user equipment.

The method according to claim 16 or 17, wherein the method further comprises: the first base station determining the second uplink primary serving cell;

The first base station sends an uplink primary serving cell change notification to the second base station or the third base station, and is used to indicate the second uplink primary serving cell determined by the first base station.

The method according to claim 16, wherein the first base station receives the random access preamble from an uplink carrier associated with system information block-2 SIB2 of the downlink primary serving cell.

A user equipment, comprising:

a control module, configured to determine that the user equipment needs to request an uplink grant to the second base station, where the at least one component carrier of the second base station corresponds to an uplink primary serving cell of the user equipment;

a sending module, configured to: when the control module determines that the user equipment needs to request the uplink grant, send a random access preamble to the first base station, where the at least one component carrier of the first base station corresponds to the user equipment Downstream primary service cell;

a receiving module, configured to receive a random access response RAR message from the first base station, where the RAR message is sent by the first base station according to the random access preamble;

The sending module is further configured to send, according to the RAR message, an uplink grant allocation indication to the first base station, so that the first base station sends the uplink grant allocation indication to the second base station, where the uplink And the granting the allocation indication is used to instruct the user equipment to request an uplink grant from the second base station;

The receiving module is further configured to receive an uplink grant from the second base station, where the uplink grant is sent by the second base station according to the uplink grant allocation indication.

The user equipment according to claim 21, wherein the control module is further configured to: if the user equipment does not send a resource of a scheduling request at the second base station, determine that the user equipment needs to The second base station requests an uplink grant.

The user equipment according to claim 22, wherein the user equipment further comprises: a counting module, configured to count the number of times the scheduling request is sent by the second base station;

The control module is further configured to use, according to the counting module, the number of times the scheduling request is sent by the second base station, and if the number of times that the second base station sends the scheduling request reaches a preset maximum number of transmissions, determine The user equipment needs to request an uplink grant from the second base station.

24. A base station, comprising:

a receiving module, configured to receive a random access preamble from the user equipment, where the at least one component carrier of the base station corresponds to a downlink primary serving cell of the user equipment;

a sending module, configured to send, according to the random access preamble, a random access response RAR message to the user equipment;

The receiving module is further configured to receive an uplink grant allocation indication from the user equipment, where the uplink grant allocation indication is used to instruct the user equipment to request an uplink grant from the second base station;

The sending module is further configured to send the uplink grant allocation indication to the second base station, so that the second base station sends an uplink grant to the user equipment according to the uplink grant allocation indication, The at least one component carrier of the second base station corresponds to an uplink primary serving cell of the user equipment.

25. A base station, comprising:

a receiving module, configured to receive, by the first base station, an uplink grant allocation indication sent by the user equipment to the first base station, where the uplink grant allocation indication is used to instruct the user equipment to request an uplink grant from the base station, where At least one component carrier of the first base station corresponds to a downlink primary serving cell of the user equipment, and at least one component carrier of the base station corresponds to an uplink primary serving cell of the user equipment;

And a sending module, configured to send an uplink grant to the user equipment according to the uplink grant allocation indication.

26. A user equipment, comprising:

a control module, configured to determine that synchronization needs to be restored if the radio link of the user equipment in the first uplink primary serving cell fails, and the second component carrier of the second base station corresponds to the first uplink primary serving cell;

a sending module, configured to send a random access preamble to the first base station, where the first component carrier of the first base station corresponds to a downlink primary serving cell of the user equipment;

a receiving module, configured to receive a random access response RAR message from the first base station, where the RAR message is sent by the first base station according to a random access preamble;

The sending module is further configured to send an out-of-synchronization indication to the first base station according to the RAR message, where the out-of-synchronization indication is used to indicate that the radio link fails;

The receiving module is further configured to receive, by the first base station, a change indication sent by the first base station according to the out-of-synchronization indication, where the change indication is used to indicate a second uplink primary serving cell of the user equipment And the third component carrier of the second base station or the fourth component carrier of the third base station corresponds to the second uplink primary serving cell.

27. A base station, comprising:

a receiving module, configured to receive a random access preamble from a user equipment, where a first component carrier of the base station corresponds to a downlink primary serving cell of the user equipment;

The receiving module is further configured to receive an out-of-synchronization indication from the user equipment, where the out-of-step indication is used Instructing the user equipment to fail the radio link in the first uplink primary serving cell, and the second component carrier of the second base station corresponds to the first uplink primary serving cell;

The sending module is further configured to send, according to the out-of-synchronization indication, a change indication to the user equipment, where the change indication is used to indicate a second uplink primary serving cell of the user equipment, and the second base station The three component carrier or the fourth component carrier of the third base station corresponds to the second uplink primary serving cell.

The base station according to claim 27, wherein the sending module is further configured to send the out-of-synchronization indication to the second base station or the third base station.

The base station according to claim 27, wherein the base station further comprises: a determining module, configured to determine the second uplink primary serving cell, wherein the sending module is further configured to use the second base station Or the third base station sends an uplink primary serving cell change notification, configured to notify the second base station or the third base station of the second uplink primary serving cell determined by the first base station.