CN102123406A - Method, device and system for maintaining uplink of multi-carrier system - Google Patents

Abstract

The invention discloses a method, device and system for maintaining the uplink of a multi-carrier system. Wherein, the method includes: the user equipment detects that the uplink synchronization timer on some of the component carriers in operation has expired, and the user equipment notifies the base station of information about the timeout, or the user equipment deactivates or deletes some of the component carriers. Through the present invention, the maintenance reliability and robustness of the uplink in a multi-carrier system can be improved.

Description

Maintenance method, device and system for multi-carrier system uplink

technical field

The present invention relates to the communication field, in particular, to a maintenance method, device and system for uplink of a multi-carrier system.

Background technique

Long Term Evolution Advance (LTE-Advanced for short) is an organization organized by the 3rd Generation Partner Project (3GPP for short) in order to meet the requirements of the International Telecommunication Union (International Telecommunication Union, ITU for short), advanced international A standard launched according to the requirements of International Mobile Telecommunication-Advanced (IMT-Advanced for short). The LTE-Advanced system is an evolved version based on the Long Term Evolution (LTE for short), which introduces many new technologies to meet the basic needs of IMT-Advanced, the most important of which is carrier aggregation. .

Due to the current shortage of wireless spectrum resources, the spectrum resources owned by mobile operators in the world are often scattered, and IMT-Advanced requires higher peak rate indicators (100Mbps under high mobility and 1Gbps under low mobility). The maximum bandwidth of 20MHz in the current LTE standard cannot meet the requirements of IMT-Advanced, so it needs to be expanded to a higher bandwidth, such as 40MHz, 60MHz, or even higher. One of the methods to increase the bandwidth and peak rate is to expand the frequency domain, for example, to expand the bandwidth of several 20MHz-based LTE frequency bands through "carrier aggregation", which is the essence of carrier aggregation technology. Therefore, the LTE-Advanced system also belongs to the multi-carrier system.

In the LTE-Advanced system applying the carrier aggregation technology, the carriers participating in the aggregation are called component carriers (Component Carrier), and the user equipment (User Equipment, referred to as UE) can simultaneously transmit and receive transmissions with the eNB on multiple component carriers. The component carrier can use frequency bands already defined by LTE, or use frequency bands specially added for LTE-Advanced. Due to the current shortage of spectrum resources, it is impossible to always have continuous component carriers in the frequency domain that can be allocated to operators. Therefore, component carriers can be continuous or discontinuous in frequency bands.

After the carrier aggregation technology is introduced, the UE can simultaneously transmit and receive on multiple component carriers in the RRC CONNECTED state, but for the UE in the idle state (RRC IDLE), like LTE, it can only reside on one component carrier In general, after the UE successfully accesses the component carrier, that is, after the UE establishes an RRC connection on the component carrier, according to service needs, the base station can allocate new component carriers for the UE through dedicated RRC signaling, and allocate these new component carriers There are two types of behaviors of the base station and UE:

Behavior 1: After a new component carrier is allocated, the base station and the UE perform data transmission and reception on the new component carrier, that is, the new component carrier is activated after configuration.

Behavior 2: After allocating a new component carrier, the base station and UE do not immediately send and receive data on the newly added component carrier, that is, the base station does not send service data to the UE on the newly added component carrier, and the UE saves the newly added component carrier. The configuration information on the component carrier does not send service data to the base station on the newly added component carrier, and waits for further actions of the base station. Subsequent base stations may deactivate the component carrier according to service needs. After the component carrier is activated, the base station and the UE can transmit and receive data on the component carrier.

In the LTE system, in order to realize and maintain the uplink synchronization between the user equipment and the base station, the base station sends a Timing Advance (TA for short) to each user equipment according to the transmission delay between the base station and each user equipment. The equipment advances or delays the timing of their uplink transmission according to the timing advance sent by the base station, so as to compensate for the transmission delay from the user terminal to the base station, so that the uplink signals of different user equipment arrive at the base station within the receiving window of the base station.

In the LTE system, in order to obtain and maintain the uplink synchronization between the UE and the base station, the base station configures an uplink synchronization timer (timeAlignmentTimer, referred to as TAT) for the UE. If the UE can receive the time sent by the base station to the UE before the TAT expires If the advance amount is not sufficient, it is considered that the uplink synchronization between the UE and the base station is maintained; otherwise, the TAT times out, and the UE considers that the uplink synchronization is lost. In the unsynchronized state or the out-of-synchronization state, the UE obtains uplink synchronization with the base station through the random access process. After receiving the random access response (Random Access Response) sent by the base station, the UE starts the timer TAT, and according to the The timing advance carried in the random access response advances or delays the timing of uplink transmission. After the UE obtains uplink synchronization with the base station, during TAT operation, if it receives the TA command (TA command) sent by the base station to the UE, it will restart TAT, and use the timing advance carried in the TA command to advance or delay the uplink transmission time, and the UE It thinks that it continues to maintain uplink synchronization with the base station; if the UE does not receive a TA command during the TAT operation, that is, when the TAT times out, the UE thinks that it has lost uplink synchronization with the base station, and deletes all dynamically allocated uplink and downlink resources for the UE. For the hybrid adaptive retransmission buffer (HARQ buffer) data to be sent uplink, notify the Radio Resource Control (RRC) sublayer to release the static/semi-static uplink physical resources allocated to the UE. If there is a need to send or receive downlink data, the UE needs to perform random access first to regain uplink synchronization.

After carrier aggregation is introduced, user equipment can work on multiple component carriers at the same time, and these component carriers can be continuous or discontinuous in frequency bands; they can be in the same frequency band or come from different frequency bands. For the case where the component carriers are discontinuous, or the component carriers come from different frequency bands, since each component carrier has different transmission characteristics, the timing advances on each component carrier may be different from each other; even if each component carrier belongs to the same frequency band and is in the The frequency band is continuous. If each component carrier originates from different remote radio units (referred to as RRU), or in order to increase cell coverage, each component carrier is processed by a different repeater (repeater), then each component carrier The timing advances may also differ from carrier to carrier. In the LTE system, the UE only works on one carrier (one carrier for the time division duplex mode, and a pair of uplink and downlink carriers for the frequency division duplex mode. For the convenience of description, it is referred to as one carrier here), and only needs to maintain one uplink Link uplink synchronization, and in carrier aggregation, UE can work on multiple component carriers at the same time, and the TA of these component carriers may be different, so how to maintain the uplink synchronization on these multiple uplinks is carrier aggregation issues that urgently need to be resolved.

Aiming at the problem of poor maintenance reliability and robustness of the uplink in the multi-carrier system in the related art, no effective solution has been proposed yet.

Contents of the invention

The main purpose of the present invention is to provide a maintenance method, device and system for uplink of a multi-carrier system, so as to at least solve the above problems.

According to one aspect of the present invention, there is provided a method for maintaining the uplink of a multi-carrier system, including: the user equipment detects that the uplink synchronization timer on some of the working component carriers has expired; the user equipment notifies the base station of information about the timeout , or the user equipment deactivates or deletes some component carriers.

Preferably, the user equipment detecting that the uplink synchronization timers on some of the operating component carriers expire includes: the user equipment maintains independent uplink synchronization timers for each operating component carrier, and the user equipment detects that one or more of the component carriers in each component carrier The uplink synchronization timer on each component carrier times out; or the user equipment divides each working component carrier into different component carrier groups according to the difference in time advance, maintains an independent uplink synchronization timer for each component carrier group, and the user equipment detects The uplink synchronization timer to one or more component carrier groups expires.

Preferably, the user equipment notifying the base station of the timeout information includes: the user equipment notifies the base station of the timeout information through the component carrier whose uplink synchronization timer has not timed out.

Preferably, the user equipment notifying the base station of the timeout information includes: the user equipment notifying the base station of the timeout information through the medium access control unit.

Preferably, the timeout information includes: information characterizing some component carriers.

Preferably, after the user equipment notifies the base station of the timeout information, the method further includes: the user equipment receives a command message from the base station, wherein the command message is used to instruct deactivation or deletion of some component carriers.

Preferably, after the user equipment notifies the base station of the timeout information, the method further includes: the user equipment receives a command message from the base station, wherein the command message is used to instruct to reacquire uplink synchronization of some component carriers.

Preferably, after the user equipment notifies the base station of the timeout information, the method further includes: the user equipment receives a command message from the base station, wherein the command message is used to instruct to re-maintain uplink synchronization on some component carriers.

According to another aspect of the present invention, a user equipment is provided, including: a detection module, which detects that the uplink synchronization timer on some component carriers in operation has expired; and a processing module, which is used to deactivate or delete some component carriers.

According to another aspect of the present invention, a user equipment is provided, including: a detection module, which detects that the uplink synchronization timer on some component carriers in operation has expired; a sending module, which is used to notify the base station of information about the timeout.

According to another aspect of the present invention, a multi-carrier system uplink maintenance system is provided, including: the user equipment notifies the base station about Timeout information or deactivation or deletion of some component carriers; the base station, when receiving the timeout information, sends a command message to the user equipment, and the command message is used to instruct deactivation or deletion of some component carriers, or to indicate Reacquire uplink synchronization of some component carriers, or indicate to re-maintain uplink synchronization on some component carriers.

Preferably, the user equipment notifies the base station of the timeout information through the component carrier whose uplink synchronization timer has not timed out.

Through the present invention, the user equipment detects that the uplink synchronization timer on some of the component carriers in operation has expired, and the user equipment notifies the base station of information about the timeout, or the user equipment deactivates or deletes some of the component carriers, which solves the problem of multi-carrier systems. The maintenance reliability and robustness of the uplink are poor.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of carrier aggregation coverage according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for maintaining an uplink of a multi-carrier system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the sequence of uplink maintenance performed on each component carrier according to an embodiment of the present invention;

Fig. 4 is a flow chart of uplink maintenance on each component carrier according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of uplink maintenance based on whether the TAs are the same according to an embodiment of the present invention;

Fig. 6 is a flow chart of performing uplink maintenance based on whether the TAs are the same according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a user equipment according to an embodiment of the present invention;

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

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Fig. 1 is a schematic diagram of carrier aggregation coverage according to an embodiment of the present invention.

The frequency division duplex mode (Frequency Division Duplex, referred to as FDD) is taken as an example for description below.

As shown in Figure 1, component carrier 1 (downlink frequency point f1, uplink frequency point f1'), referred to as CC 1 (DL f1, UL f1'); component carrier 2 (downlink frequency point f2, uplink frequency point f2') , referred to as CC2 (DL f2, UL f2'); component carrier 3 (downlink frequency point f3, uplink frequency point f3,), referred to as CC3 (DL f3, UL f3') can perform carrier aggregation. The user equipment UE camps on CC1, and currently does not establish any service, and is in an idle state. When the UE needs to perform service transmission on multiple component carriers, in the present invention, the UE and the base station respectively maintain uplink synchronization on each component carrier.

As shown in FIG. 1 , according to another embodiment of the present invention, component carrier 1, component carrier 2, and component carrier 3 can perform carrier aggregation, wherein component carrier 1 and component carrier 2 have the same TA, and component carrier 3 has the same TA as the other two The TAs of each component carrier are different. The user equipment UE camps on CC1, and currently does not establish any service, and is in an idle state. When the UE needs to perform service transmission on multiple component carriers, in this embodiment, the UE and the base station perform uplink synchronization maintenance based on whether the TA is the same, that is, the uplink synchronization is uniformly maintained on multiple CCs with the same TA, and the uplink synchronization is maintained on multiple CCs with the same TA. Uplink synchronization is independently maintained between CCs.

According to an embodiment of the present invention, a method for maintaining an uplink of a multi-carrier system is provided.

Fig. 2 is a flowchart of a method for maintaining an uplink of a multi-carrier system according to an embodiment of the present invention.

As shown in Figure 2, the method includes the following steps S202 to S204:

Step S202, the user equipment detects that the uplink synchronization timer on some of the component carriers in operation has timed out;

In step S204, the user equipment notifies the base station of timeout information, or the user equipment deactivates or deletes some component carriers.

In the present invention, the user equipment detects that the uplink synchronization timer on some of the working component carriers has expired includes: the user equipment maintains an independent uplink synchronization timer for each working component carrier, and the user equipment detects that one or more component carriers The uplink synchronization timer on the carrier expires; or the user equipment divides the working component carriers into different component carrier groups according to whether the time advance (TA) is the same, and maintains an independent uplink synchronization timer for each component carrier group , the user equipment detects that the uplink synchronization timer on one or more component carrier groups expires.

Wherein, the user equipment notifies the base station of the timeout information may include: the user equipment notifies the base station of the timeout information through the component carrier whose uplink synchronization timer has not timed out.

Wherein, the user equipment notifies the base station of the timeout information may include: the user equipment notifies the base station of the timeout information through the medium access control unit.

Wherein, the above information about timeout includes: information characterizing some component carriers.

In the present invention, after the user equipment notifies the base station of the timeout information, the method may further include: the user equipment receives a command message from the base station, where the command message is used to instruct deactivation or deletion of some component carriers.

Wherein, after the user equipment notifies the base station of the timeout information, the method may further include: the user equipment receives a command message from the base station, where the command message is used to instruct to reacquire uplink synchronization of some component carriers.

Wherein, after the user equipment notifies the base station of the timeout information, the method may further include: the user equipment receives a command message from the base station, where the command message is used to instruct to re-maintain uplink synchronization on some component carriers.

In the present invention, when the base station adds one or more component carriers, the method may further include: the user equipment judges whether the TA of the newly added one or more component carriers is the same as the TA of the working component carrier; If the judgment result is yes, the user equipment directly starts the uplink synchronization timer for the newly added one or more component carriers; random access.

Fig. 3 is a schematic diagram of a sequence of uplink maintenance performed on each component carrier according to an embodiment of the present invention; Fig. 4 is a flowchart of uplink maintenance performed on each component carrier according to an embodiment of the present invention.

As shown in FIG. 3 and FIG. 4 , the present invention takes frequency division duplex mode as an example, wherein component carrier 1 , component carrier 2 and component carrier 3 can perform carrier aggregation. The user equipment UE camps on CC1, and currently does not establish any service, and is in an idle state. When the UE needs to perform service transmission on multiple component carriers, referring to FIG. 3, in this embodiment, the UE and the base station respectively maintain uplink synchronization on each component carrier. The specific process is shown in FIG. 4. The method includes the following steps :

Step S301: The UE first acquires uplink synchronization with the serving base station on the camping component carrier CC1. That is, the UE performs random access on component carrier CC1. After receiving the random access response fed back to the UE by the serving base station, the UE starts the uplink synchronization timer TAT1 on CC1 (point A shown in FIG. Calculate the uplink transmission opportunity on CC1(f1') based on the timing advance carried in the incoming response.

Step S302: UE maintains uplink synchronization on component carrier CC1. That is, if the UE receives the TA command sent by the serving base station during the operation of TAT1, it will restart TAT1, and use the timing advance carried in the TA command to calculate the uplink transmission opportunity on CC1(f1'); if the UE does not have After receiving the TA command, when TAT1 times out, the UE considers that it has lost uplink synchronization with the serving base station.

Step S303: the UE acquires uplink synchronization on the newly added component carrier CC2. The serving base station allocates and activates the newly added component carrier CC2 for the UE according to service needs, and at the same time indicates whether the TA of CC2 is the same as that of CC1 (assumed to be the same in this embodiment). The UE acquires uplink synchronization on CC2 according to whether the TA of CC2 is the same as that of CC1. That is, if the TA of CC2 is the same as that of CC1, the UE directly starts the uplink synchronization timer TAT2 on CC2 (point B shown in Figure 3), and directly calculates the TA on CC2 (f2') based on the latest timing advance on CC1. Uplink transmission timing. If the TA of CC2 is different from that of CC1, the UE performs random access on component carrier CC2. After receiving the random access response fed back to the UE by the serving base station, the UE starts TAT2 and advances the time according to the time carried in the random access response. Calculate the uplink transmission opportunity on CC2(f2').

Wherein, the durations of TAT1 and TAT2 can be configured to be the same or different according to actual needs.

It should be noted that while the UE acquires the uplink synchronization on the newly added component carrier CC2, the UE continues to maintain the uplink synchronization on the component carrier CC1.

Step S304: The UE and the serving base station maintain uplink synchronization on component carriers CC1 and CC2 respectively. That is, the serving base station sends TA commands on CC1 (f1) and CC2 (f2) respectively; the UE restarts TAT1/TAT2 according to the TA commands sent on CC1/CC2 respectively.

Among them, during the operation of TAT1, if the UE receives the TA command sent by the serving base station on CC1, the UE restarts TAT1, and uses the timing advance carried in the TA command to calculate the uplink transmission opportunity on CC1 (f1'); also in TAT2 During operation, if receiving the TA command sent by the serving base station on CC2, the UE restarts TAT2, and uses the timing advance carried in the TA command to calculate the uplink transmission opportunity on CC2(f2').

The serving base station may carry information characterizing component carriers in the TA command, and after receiving the TA command, the UE determines which component carrier is the TA command based on the information.

Step S305: The UE does not receive the TA command sent by the serving base station on CC1 during the operation of TAT1, that is, TAT1 times out, but TAT2 has not timed out at this time (as shown in Figure 3 point C), and the UE turns to the step of maintaining the uplink S306-1 or step S306-2.

Step S306-1: The UE continues to perform normal data communication and link maintenance on CC2 (as shown in Figure 3 at point D, the UE receives the TA command sent by CC2 and restarts TAT2), and the UE notifies the serving base station CC1 through CC2 The specific notification method can be by sending a special uplink MAC CE (Medium Access Control Elements, Media Access Control Unit) on CC2. The MAC CE carries information that characterizes CC1 (f1'), such as the frequency of CC1 information, or the identity information (or index information) of CC1 allocated by the serving base station when it allocates CC1 to the UE. For example, in this embodiment, the base station allocates two identities to CC1 and CC2 respectively information, CC1 is identity 1, and CC2 is identity 2, then the information representing CC1(f1') carried in the MAC CE is identity 1. The MAC CE is used to indicate that the uplink of the indicated component carrier is out of synchronization, or the TAT is timed out. The UE stops sending uplink data on CC1, and waits for a command from the serving base station.

After receiving the uplink status of CC1 reported by the UE, the serving base station judges that the uplink of CC1 is out of synchronization based on factors such as the uplink synchronization maintenance algorithm, resource scheduling algorithm, and downlink channel quality. To send a TA command, or the UE cannot correctly receive the TA command sent by CC1 due to the poor downlink channel of CC1, etc., and take different actions. For example, if CC1 loses uplink synchronization, the serving base station can instruct the UE to perform random access on CC1 to reacquire uplink synchronization according to business needs, or the serving base station can notify the UE to deactivate CC1, or notify the UE to directly delete the configuration of CC1; if Because the scheduling algorithm is unreasonable and the TA command has not been sent on CC1 for a long time, the serving base station can continue to schedule the UE on CC1 or send a new TA command to the UE. After receiving it, the UE starts TAT1 on CC1 and re-maintains the uplink of CC1 Synchronize, and restart sending and receiving on CC1; if the downlink channel is too bad, the serving base station can notify the UE to deactivate CC1, or notify the UE to directly delete the configuration of CC1.

Step S306-2: UE continues to perform normal data communication and link maintenance on CC2 (as shown in Figure 3 at point D, UE receives the TA command sent by CC2 and restarts TAT2), UE deactivates CC1, that is, UE Save the configuration information on CC1, but do not send and receive business data on CC1; or directly delete the configuration of CC1.

The serving base station correspondingly deactivates CC1 or deletes configurations on CC1 according to an uplink synchronization maintenance algorithm or a scheduling mechanism.

Whether to use deactivation or deletion is determined in advance by the UE and the serving base station, or stipulated by an agreement.

Using the method used in this embodiment of the present invention, in carrier aggregation, each component carrier maintains the uplink independently, and when the uplink synchronization timer on some component carriers expires, the UE notifies the serving base station, or deactivates/deletes these component carriers , and continue to maintain normal communication on the uplink synchronized component carrier, which enhances the reliability of uplink maintenance, and finally ensures the continuity of data transmission, thereby providing good service experience for user equipment.

FIG. 5 is a schematic diagram of a sequence of performing uplink maintenance based on whether TAs are the same according to an embodiment of the present invention; FIG. 6 is a flow chart of performing uplink maintenance based on whether TAs are the same according to an embodiment of the present invention.

As shown in Figure 5 and Figure 6, in this invention, component carrier 1, component carrier 2, and component carrier 3 can perform carrier aggregation, wherein component carrier 1 and component carrier 2 have the same TA, and component carrier 3 is the same as the other two component carriers The TAs of the carriers are all different. The user equipment UE camps on CC1, and currently does not establish any service, and is in an idle state. When the UE needs to perform service transmission on multiple component carriers, referring to Figure 5, in this embodiment, the UE and the base station perform uplink synchronization maintenance based on whether the TA is the same, that is, the uplink synchronization is uniformly maintained on multiple CCs with the same TA , independently maintain uplink synchronization between CCs with different TAs, the specific process is shown in Figure 6, the method includes the following steps:

Step S501: the method is the same as step S301.

Step S502: The method is the same as step S302.

Step S503: The serving base station allocates and activates the newly added component carrier CC2 for the UE according to service requirements, and at the same time indicates that the TA of CC2 is the same as that of CC1. After receiving the allocation message, the UE judges that the uplink synchronization of CC2 is unified with that of CC1, that is, the UE uniformly maintains the uplink synchronization timer TAT1 on CC1 and CC2, and directly calculates it on CC2 (f2') according to the latest timing advance on CC1 uplink transmission timing.

Step S504: The UE and the serving base station uniformly maintain uplink synchronization on component carriers CC1 and CC2.

Wherein, the serving base station may send the TA command in different ways according to different scheduling algorithms. For example: the serving base station sends TA commands on CC1 and CC2 at the same time; the serving base station sends TA commands on CC1 and CC2 in turn or randomly; the serving base station selects the CC with the best channel quality (such as CC1) to send TA commands; A CC (such as CC1) sends a TA command, and the serving base station does not receive feedback from the UE after retransmitting the TA command multiple times (such as N times) on the CC, then the serving base station reselects another CC (such as CC2) to send the TA command. Order.

If the UE receives a TA command on CC1 or CC2 during the operation of TAT1, restart TAT1, and use the timing advance carried in the TA command to calculate the uplink transmission opportunity on CC1(f1') and CC2(f1'). If the UE does not receive a TA command on CC1 or CC2 during the operation of TAT1, when TAT1 times out, the UE considers that it has lost uplink synchronization with the serving base station.

Step S505: the UE acquires uplink synchronization on the newly added component carrier CC3. The serving base station allocates and activates the newly added component carrier CC3 for the UE according to service requirements, and at the same time indicates that the TA of CC3 is different from that of CC1/CC2. The UE performs random access on the component carrier CC3. When the UE receives the random access response fed back to the UE by the serving base station, it starts TAT2 and calculates it on CC3(f3') according to the timing advance carried in the random access response. uplink transmission timing.

Step S506: The UE and the serving base station uniformly maintain uplink synchronization on CC1 and CC2, and independently maintain uplink synchronization on CC3. That is, the serving base station uses the possible method described in step S504 to send the TA command on CC1 or CC2, and the serving base station independently sends the TA command on CC3; the UE measures TAT1/TAT2 according to the TA commands on CC1 or CC2 and CC3 respectively.

Step S507: UE does not receive the TA command sent by the serving base station on CC1 or CC2 during the operation of TAT1, that is, TAT1 times out, but TAT2 has not yet timed out (point D shown in Figure 5). At this time, the UE transfers to step S508-1 or step S508-2 of maintaining the uplink.

Step S508-1: The UE continues to perform normal data communication and link maintenance on CC3 (as shown in Figure 5 at point E, the UE receives the TA command sent by CC3 and restarts TAT2), and the UE notifies the serving base station CC1 through CC3 The uplink situation of CC2 and CC2 can be notified specifically by sending special uplink Medium Access Control Elements (Medium Access Control Elements, referred to as MAC CE) on CC3. or the information of CC2 (f2'), such as the frequency information of CC1 and/or CC2, or the identification information (or index information) allocated by the serving base station when allocating CC1 and CC2 to the UE, as in this embodiment, the base station is in When CC1, CC2 and CC3 are allocated to the UE, three identification information are allocated to CC1, CC2 and CC3 respectively, CC1 is the identification 1, CC2 is the identification 2, and CC3 is the identification 3, then the representation CC1(f1') carried in the MACCE and/or the information of CC2(f2') is identity 1 and/or identity 2. The MAC CE is used to indicate that the uplink of the indicated component carrier is out of synchronization, or the TAT is timed out. The UE stops sending uplink data on CC1 and CC2, and waits for a command from the serving base station.

The processing after the serving base station receives the uplink status reported by the UE is the same as step S306-1.

Step S508-2: UE continues to perform normal data communication and link maintenance on CC3 (as shown in Figure 5 at point E, UE receives the TA command sent by CC3 and restarts TAT2), UE deactivates CC1 and CC2, That is, the UE saves the configuration information on CC1 and CC2, but does not send and receive service data on CC1 and CC2; or directly deletes the configurations on CC1 and CC2.

Wherein, the serving base station correspondingly deactivates CC1 and CC2 or deletes configurations on CC1 and CC2 according to an uplink synchronization maintenance algorithm or a scheduling mechanism.

Whether to use deactivation or deletion is determined in advance by the UE and the serving base station, or stipulated by an agreement.

Using the method used in this embodiment of the present invention, in carrier aggregation, multiple CCs with the same TA (called CC groups) uniformly maintain uplink synchronization, and independently maintain uplink synchronization among CC groups with different TAs. When the uplink synchronization timer of one or more CC groups (partial component carriers) expires, the UE notifies the serving base station, or deactivates/deletes these component carriers, and continues to maintain normal communication on the uplink synchronized component carriers, which enhances the uplink This ensures the reliability of road maintenance and ultimately ensures the continuity of data transmission, thereby providing user equipment with a good service experience.

From the above description, it can be seen that the present invention achieves the following technical effects:

According to an embodiment of the present invention, a user equipment is provided.

Fig. 7 is a schematic diagram of a user equipment according to an embodiment of the present invention.

As shown in FIG. 7 , the device includes: a detection module 701 and a sending module 702 .

Wherein, the detection module 701 is used to detect the timeout of the uplink synchronization timer on some of the working component carriers; the sending module 702 is used to notify the base station of information about the timeout.

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

As shown in FIG. 8 , the device includes: a detection module 801 and a processing module 802 .

Wherein, the detection module 801 detects that the uplink synchronization timer on some of the component carriers in operation has expired; the processing module 802 is used for deactivating or deleting some of the component carriers.

According to an embodiment of the present invention, a system for maintaining an uplink of a multi-carrier system is provided.

The maintenance system for the uplink of the multi-carrier system includes: the user equipment, in the case of detecting that the uplink synchronization timer on some of the working component carriers has expired, notifies the base station of information about the timeout or deactivates or deletes some of the component carriers; the base station , when the timeout information is received, sending a command message to the user equipment, where the command message is used to instruct to deactivate or delete the part of component carriers, or to instruct to reacquire the part The uplink synchronization of the component carriers, or used to instruct to re-maintain the uplink synchronization on the part of the component carriers.

Preferably, the user equipment notifies the base station of the timeout information through the component carrier whose uplink synchronization timer has not timed out.

When the uplink synchronization timer of some component carriers of the uplink maintenance system of the multi-carrier system expires, the UE notifies the serving base station, or the UE deactivates the component carriers, or the UE deletes the component carriers.

Among them, the serving base station and the UE independently maintain the uplink on each component carrier. When the uplink synchronization timer of one or several component carriers expires, the UE notifies the serving base station of one or several component carriers through the component carrier whose uplink synchronization timer has not expired. The uplink status of the carrier. After receiving the notification from the UE, the serving base station notifies the UE to re-acquire uplink synchronization on one or several component carriers, or notifies the UE to deactivate one or several component carriers, or notifies the UE to delete one or several component carriers, or continues to operate on Schedule UE on one or several component carriers.

In the present invention, the serving base station and the UE independently maintain the uplink on each component carrier, and when the uplink synchronization timer of one or several component carriers expires, the UE deactivates one or several component carriers.

Wherein, the serving base station and the UE independently maintain the uplink on each component carrier, and when the uplink synchronization timer of one or several component carriers expires, the UE deletes one or several component carriers.

Among them, the serving base station and the UE uniformly maintain the uplink of the component carrier group with the same TA, and independently maintain the uplink of each component carrier group. Notify the serving base station of the uplink status of one or several component carrier groups through the component carriers in the component carrier group whose device has not timed out.

The serving base station and the UE uniformly maintain the uplink of the component carrier groups with the same TA, and independently maintain the uplink of each component carrier group. When the uplink synchronization timer of one or several component carrier groups expires, the UE deactivates one or several component carrier groups. component carrier groups or delete one or several component carrier groups.

In the present invention, when the serving base station adds one or several component carriers, the UE acquires uplink synchronization on the newly added component carriers. According to whether the TA of the newly added component carrier is the same as that of the already working component carrier, if it is the same, the UE directly starts the uplink synchronization timer for each newly added component carrier; if not, the UE performs random access on the newly added component carrier.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. the maintaining method of a multicarrier system up link is characterized in that, comprising:

The upstream synchronous timing device that subscriber equipment detects on the part component carrier of being worked is overtime;

Described subscriber equipment to base station notice about overtime information, perhaps described subscriber equipment deexcitation or delete described part component carrier.

2. method according to claim 1 is characterized in that, subscriber equipment detects overtime the comprising of upstream synchronous timing device on the part component carrier of being worked:

Described subscriber equipment is that each component carrier of being worked is safeguarded independently upstream synchronous timing device, and it is overtime that described subscriber equipment detects in described each component carrier the upstream synchronous timing device on one or more component carriers; Perhaps

Described subscriber equipment is divided into different component carrier groups according to the difference of Timing Advance with each component carrier of being worked, for each component carrier group is safeguarded independently upstream synchronous timing device, it is overtime that described subscriber equipment detects the upstream synchronous timing device of one or more component carrier groups.

3. method according to claim 1 is characterized in that, described subscriber equipment comprises about overtime information to the base station notice:

It is described about overtime information that described subscriber equipment does not have overtime component carrier to notify to described base station by the upstream synchronous timing device.

4. method according to claim 3 is characterized in that, described subscriber equipment comprises about overtime information to the base station notice:

Described subscriber equipment is notified described about overtime information by medium access control unit to described base station.

5. method according to claim 1 is characterized in that, describedly comprises about overtime information:

Characterize the information of described part component carrier.

6. method according to claim 1 is characterized in that, after the base station notice was about overtime information, described method also comprised at described subscriber equipment:

Described subscriber equipment receives the command messages from described base station, and wherein, described command messages is used for indication described part component carrier is carried out deexcitation or deletion.

7. method according to claim 1 is characterized in that, after the base station notice was about overtime information, described method also comprised at described subscriber equipment:

Described subscriber equipment receives the command messages from described base station, and wherein, described command messages is used to indicate the uplink synchronous of obtaining described part component carrier again.

8. method according to claim 1 is characterized in that, after the base station notice was about overtime information, described method also comprised at described subscriber equipment:

Described subscriber equipment receives the command messages from described base station, wherein, described command messages be used for indication again on described part component carrier maintaining uplink synchronous.

9. a subscriber equipment is characterized in that, comprising:

Detection module, the upstream synchronous timing device that detects on the part component carrier of being worked is overtime;

Sending module is used for to the base station notice about overtime information.

10. a subscriber equipment is characterized in that, comprising:

Detection module, the upstream synchronous timing device that detects on the part component carrier of being worked is overtime;

Processing module is used for deexcitation or deletes described part component carrier.

11. the maintenance system of a multicarrier system up link is characterized in that, comprising:

Subscriber equipment, under the overtime situation of the upstream synchronous timing device on the part component carrier of working detecting to the base station notice about overtime information or deexcitation or delete described part component carrier;

The base station, under the situation that receives described overtime information, send command messages to described subscriber equipment, described command messages is used for indication described part component carrier is carried out deexcitation or deletion, perhaps be used to indicate the uplink synchronous of obtaining described part component carrier again, perhaps be used for the indication again on described part component carrier maintaining uplink synchronous.

12. system according to claim 11 is characterized in that, described subscriber equipment does not have overtime component carrier to come to described base station notice about overtime information by the upstream synchronous timing device.

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