CN102104982B

CN102104982B - Method and device for reconnecting multi-carrier system

Info

Publication number: CN102104982B
Application number: CN201010139697.2A
Authority: CN
Inventors: 梁靖; 李海涛
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2010-04-01
Filing date: 2010-04-01
Publication date: 2014-06-04
Anticipated expiration: 2030-04-01
Also published as: WO2011120445A1; CN102104982A

Abstract

The invention discloses a method for reconnecting a multi-carrier system. The method comprises the following steps: if a reconnecting process is triggered by user equipment (UE) under a multi-carrier state, utilizing a network side device to receive the reconnecting request information which is sent to the network side device from a selected cell by the UE, and utilizing the network side device to perform wireless resource allocation on the multi-carrier of the UE according to the reconnecting request information. By using the method provided by the embodiment of the invention, the hollow signaling overhead is saved and the state transition delay is reduced.

Description

Connection reestablishment method and equipment for multi-carrier system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a connection reestablishment method and device for a multi-carrier system.

Background

LTE (long term Evolution) is the Evolution of 3G (3rd Generation, third Generation digital communication), and LTE improves and enhances the 3G over-the-air access technology, and adopts OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output) as the LTE wireless network Evolution standard. In the LTE system and the previous wireless communication system, there is only one carrier in one cell, as shown in fig. 1, the maximum bandwidth in the LTE system is 20 MHz; under the spectrum bandwidth of 20MHz, LTE can provide the peak rate of 100Mbit/s downlink and 50Mbit/s uplink, improve the performance of cell edge users, improve the cell capacity and reduce the system delay. In addition, in the LTE system, a UE (User equipment) can only operate on one carrier at the same time, and one LTE cell has only one carrier, and each LTE cell is identified by a unique number in the network.

As the number of mobile end users increases rapidly, the traffic capacity of the end users increases exponentially, and in order to meet the ever-increasing traffic demands of the end users, it is necessary to provide more bandwidth to meet the higher peak rates required by the end users' traffic and applications. In an LTE-a (LTE-Advanced ) system, the peak rate of the system is greatly improved compared with that of LTE, and it is required to reach 1Gbps downlink and 500Mbps uplink, and at this time, if only one carrier with the maximum bandwidth of 20mhz is used, it is obviously impossible to reach the peak rate. Therefore, the LTE-a system needs to expand the bandwidth that can be used by the end user, thereby introducing CA (Carrier Aggregation) technology, i.e., aggregating multiple continuous or discontinuous carriers under the same cNB (or base station) (which cannot be aggregated between cell or component carriers under different enbs), and simultaneously serving the UE to provide the rate required by the UE. The aggregated carriers are also called CC (Component Carrier), each cell may be a Component Carrier, and cells (Component carriers) under different enbs cannot be aggregated. In addition, in order to ensure that the UE under LTE can operate under each aggregated carrier, each carrier is required to not exceed 20MHz at most when carrier aggregation is performed, as shown in fig. 2, which is a schematic diagram of a carrier aggregation technology under LTE-a, it can be seen that there are 4 carriers that can be aggregated under the base station of LTE-a, and the base station can perform data transmission with the UE on the 4 carriers at the same time, so as to improve system throughput.

In the prior art, for an LTE system (i.e. a single carrier system), when a UE fails handover, RLF (Radio Link Failure), RRC (Radio Resource Control protocol) connection reconfiguration, or integrity check Failure, the UE is triggered to perform an RRC connection reestablishment process.

In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:

in the prior art, only the RRC connection reestablishment procedure in the case of a single carrier is agreed, but for the case of multiple carriers (for example, when the UE is in the CA state), if the RRC connection reestablishment procedure occurs, how the RRC connection reestablishment procedure should be performed, and there is no corresponding solution in the prior art.

Disclosure of Invention

The invention provides a connection reestablishment method and equipment of a multi-carrier system, which are used for realizing a connection reestablishment process under the multi-carrier system.

In order to achieve the above object, an embodiment of the present invention provides a connection reestablishment method for a multi-carrier system, including:

if User Equipment (UE) triggers a connection reestablishment process in a multi-carrier state, network side equipment receives a connection reestablishment request message sent to the network side equipment from the UE in a selected cell;

and the network side equipment performs wireless resource configuration on the multi-carrier of the UE according to the connection reestablishment request message.

An embodiment of the present invention provides a network side device, including:

a receiving module, configured to receive a connection reestablishment request message sent from a UE to a network side device in a selected cell when the UE triggers a connection reestablishment process in a multi-carrier state;

a configuration module, configured to perform radio resource configuration on the multiple carriers of the UE according to the connection reestablishment request message received by the receiving module.

A connection reestablishment method for a multi-carrier system, comprising:

if the UE triggers a connection reestablishment process in a multi-carrier state, sending a connection reestablishment request message to network side equipment in the selected cell; and the network side equipment performs radio resource configuration on the multi-carrier of the UE according to the connection reestablishment request message.

The embodiment of the invention provides User Equipment (UE), which comprises:

the judging module is used for judging whether the UE triggers a connection reestablishment process in a multi-carrier state;

a sending module, configured to send a connection reestablishment request message to a network side device in the selected cell when a determination result of the determining module is that the UE triggers a connection reestablishment process in a multi-carrier state; and the network side equipment performs radio resource configuration on the multi-carrier of the UE according to the connection reestablishment request message.

The embodiment of the invention provides a connection reestablishment method of a multi-carrier system, which comprises the following steps:

if the UE triggers a connection reestablishment process in a multi-carrier state, the network side equipment receives a connection reestablishment request message sent to the network side equipment from the UE in the selected cell;

and the network side equipment performs wireless resource configuration on the single carrier of the UE according to the connection reestablishment request message.

a configuration module, configured to perform radio resource configuration on the single carrier of the UE according to the connection reestablishment request message received by the receiving module.

A connection reestablishment method for a multi-carrier system, comprising:

if the UE triggers a connection reestablishment process in a multi-carrier state, the UE sends a connection reestablishment request message to network side equipment in the selected cell; and the network side equipment performs wireless resource configuration on the single carrier of the UE according to the connection reestablishment request message.

The embodiment of the invention provides User Equipment (UE), which comprises:

a sending module, configured to send a connection reestablishment request message to a network side device in the selected cell when a determination result of the determining module is that the UE triggers a connection reestablishment process in a multi-carrier state; and the network side equipment performs wireless resource configuration on the single carrier of the UE according to the connection reestablishment request message.

Compared with the prior art, the invention has at least the following advantages:

the UE which has RRC connection reestablishment in the multi-carrier working state can return to the multi-carrier state as soon as possible, the signaling overhead and the state conversion delay of an air interface are saved, and the problem of PCC confusion is avoided.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic diagram of only one carrier in one cell in a prior art LTE system;

fig. 2 is a schematic diagram of a carrier aggregation technique under LTE-a in the prior art;

fig. 3 is a flowchart illustrating a connection reestablishment method for a multi-carrier system according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a connection reestablishment method for a multi-carrier system according to a second embodiment of the present invention;

FIG. 5 is a schematic diagram of an application scenario used in an embodiment of the present invention;

fig. 6 is a flowchart illustrating a connection reestablishment method for a multi-carrier system according to a third embodiment of the present invention;

fig. 7 is a flowchart illustrating a connection reestablishment method for a multi-carrier system according to a fourth embodiment of the present invention;

fig. 8 is a schematic structural diagram of a network-side device according to a fifth embodiment of the present invention;

fig. 9 is a schematic structural diagram of a user equipment according to a sixth embodiment of the present invention;

fig. 10 is a schematic structural diagram of a network-side device according to a seventh embodiment of the present invention;

fig. 11 is a schematic structural diagram of a user equipment according to an eighth embodiment of the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the technical solutions provided by the embodiments of the present invention clearly understandable to the public, the following knowledge is first introduced.

(1) RRC connection reestablishment procedure in LTE systems.

Because the LTE system is a single carrier system, when the UE fails handover, RLF (Radio link failure), RRC connection reconfiguration, or integrity check failure, the UE is triggered to perform an RRC connection reestablishment process. The purpose of the RRC connection reestablishment procedure is to recover SRB1(Signaling Radio Bearer 1) and recover security. The RRC connection reestablishment procedure includes the steps of:

1) the UE suspends all RBs (Radio bearers) except SRB 0.

2) The UE resets a MAC (Media Access Control) layer and performs a cell selection process using a default configuration. Wherein the default configuration includes default physical layer configuration, MAC layer configuration, SPS (Semi persistent scheduling) configuration, and the like.

3) When the UE selects a suitable cell (capable cell), an RRC connection reestablishment request message is transmitted to the base station in the selected cell. Wherein, the RRC connection reestablishment request message includes identification information of the UE.

4) The base station receives the RRC connection reestablishment request message of the UE, and if the UE is allowed to reestablish (namely the base station side has the context information of the UE), the base station sends the RRC connection reestablishment message to the UE.

If the RRC connection reestablishment message carries the configuration information of the radio resources, an incremental configuration mode is adopted. The incremental configuration is based on the default configuration, and the incremental configuration means that after the UE receives the RRC connection reestablishment message, for the configuration information that does not appear in the RRC connection reestablishment message, the UE will continue to use the previously saved value, and for the configuration information that appears, the UE will use the new value.

5) The UE receives the RRC connection reestablishment message and resumes SRB1 while SRB2 and all DRBs are still pending and updates the keys according to the security information in the RRC connection reestablishment message.

If the RRC connection reestablishment message includes dedicated configuration information (e.g., physical layer configuration, MAC layer configuration, SPS configuration, SRB1 configuration, etc.), the UE configures the lower layer according to the configuration information, and after the configuration is completed, the UE sends an RRC connection reestablishment complete message to the base station, and considers that the RRC connection reestablishment procedure is completed. The lower layer includes a PDCP (Packet Data convergence protocol), an RLC (Radio Link Control), an MAC (MAC), a physical layer, and the like.

6) And the base station considers that the RRC connection reestablishment process is completed when receiving the RRC connection reestablishment completion message. In order to recover the SRBs 2 and DRBs, the base station needs to send an RRC connection reconfiguration message to the UE after receiving the RRC connection reestablishment complete message to recover the SRBs 2 and DRBs.

7) If the RRC connection reconfiguration message received by the UE is the first reconfiguration message after the reestablishment process, the SRB2 and all DRBs are recovered, low-layer configuration is carried out according to the content of the RRC connection reconfiguration message, and after the reconfiguration is finished, the SRB2 and the DRBs are also recovered.

(2) Main carrier and auxiliary carrier

In the CA technology, the concepts of Primary Component Carrier (PCC) and Secondary Component Carrier (SCC) are introduced, and a UE has only one Primary Carrier (divided into uplink and downlink), and other carriers are all Secondary carriers. Wherein the characteristics of the main carrier at least include:

1) the uplink primary carrier is used for transmitting physical layer uplink control information, and the physical layer uplink control information includes information such as ACK (acknowledgement character)/NACK (negative acknowledgement character), CQI (Channel Quality Indicator), and D-SR.

2) The downlink primary carrier cannot be deactivated.

3) When the downlink main carrier has radio link failure, the UE triggers an RRC connection reestablishment process; and when the radio link failure occurs in the secondary carrier, the RRC connection reestablishment process is not triggered.

4) The system information acquisition and update of the downlink primary carrier is the same as the LTE process.

5) NAS (Non Access Stratum ) information is obtained by a downlink main carrier.

Generally, the carrier on which the UE initially establishes the connection is the PCC, and the other subsequently configured and activated carriers are SCCs. In addition, only the downlink secondary carrier can be activated and deactivated, and the uplink carrier is activated by default configuration. Since many features are bound to the primary carrier (for example, only uplink control information of the uplink physical layer is transmitted on the uplink primary carrier), the UE must have the primary carrier in the CA operating state.

(3) Carrier configuration and activation

In the LTE-a system, in order to enable the UE to enter the CA operating state, the base station first needs to send configuration information of multiple carriers (all SCCs) to the UE through RRC signaling (for example, an RRC connection reconfiguration message), and after the UE receives the configuration information, the states of the carriers are all deactivated by default and cannot operate yet. In the subsequent process, the base station activates some configured SCCs through MAC signaling, and once the SCCs are activated, normal data transceiving can be performed.

In addition, only the downlink carrier can be activated and deactivated, and the uplink carrier is activated as long as the uplink carrier is configured. Therefore, the data can be normally received and transmitted after the Downlink carrier is activated means that a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) can be monitored and decoded.

Based on the above situation, an embodiment of the present invention provides a connection reestablishment method for a multi-carrier system, as shown in fig. 3, including the following steps:

step 301, if the UE triggers the connection reestablishment procedure in the multi-carrier state, the UE sends a connection reestablishment request message to the network side device in the selected cell. Wherein, the UE sending a connection reestablishment request message to the network side device in the selected cell includes: and the UE sends a connection reestablishment request message to the network side equipment in the selected cell by using default configuration.

Step 302, the network side device performs radio resource configuration on the multiple carriers of the UE according to the connection reestablishment request message. The method for the network side device to perform radio resource configuration on the multiple carriers of the UE according to the connection reestablishment request message includes: and the network side equipment performs radio resource configuration on the multi-carrier of the UE in a connection reestablishment message in an increment configuration mode and sends the connection reestablishment message to the UE.

In the embodiment of the present invention, the performing, by the network side device, radio resource configuration on multiple carriers of the UE in a connection reestablishment message in an incremental configuration manner includes: and if the selected cell is positioned in the carrier configuration set of the UE when the UE is reconstructed and the UE stores the configuration information of other Component Carriers (CC) in a multi-carrier state, the network side equipment performs radio resource configuration on the multi-carrier of the UE by adopting an incremental configuration mode based on the original configuration information.

The method for the network side equipment to perform radio resource configuration on the multiple carriers of the UE in the connection reestablishment message by adopting an increment configuration mode comprises the following steps: if the selected cell is located in the carrier configuration set of the UE when the UE is reestablished and the UE stores the default configuration information of other CCs in the multi-carrier state, the network side equipment performs radio resource configuration on the multi-carrier of the UE by adopting an incremental configuration mode based on the default configuration information.

The method for the network side equipment to perform radio resource configuration on the multiple carriers of the UE in the connection reestablishment message by adopting an increment configuration mode comprises the following steps: if the PCC of the primary carrier before and after the UE is rebuilt is different, the network side equipment reassigns the PCC and the SCC, and performs wireless resource configuration on the multi-carrier of the UE in an incremental configuration mode based on the original configuration information or default configuration information; and if the PCCs before and after the UE is reconstructed are the same, the network side equipment directly performs radio resource configuration on the multi-carrier of the UE based on the original configuration information or the default configuration information in an incremental configuration mode.

The method for the network side equipment to perform radio resource configuration on the multiple carriers of the UE in the connection reestablishment message by adopting an increment configuration mode comprises the following steps: if the PCCs before and after the UE is reestablished are different, the network side device needs to release the physical layer uplink control channel configuration information of the source PCC and configure the physical layer uplink control channel configuration information for the new PCC.

In addition, the UE sending a connection reestablishment request message to the network side device in the selected cell includes: if the selected cell is not located in the carrier configuration set of the UE when the UE is reestablished, the UE releases all configurations and returns to a single carrier working state to send a connection reestablishment request message to network side equipment; or, the UE reserves the multi-carrier configuration information, and sends a connection reestablishment request message to the network side device in the selected cell using a default configuration; the multi-carrier configuration information is original configuration information or default configuration information.

At this time, the performing, by the network side device, radio resource configuration on multiple carriers of the UE in a connection reestablishment message in an incremental configuration manner includes: if the selected cell is not located in the carrier configuration set of the UE when the UE is reestablished, the network side device reallocates the carrier set of the UE, reassigns the PCC and the auxiliary carrier SCC, and performs radio resource configuration on multiple carriers of the UE in an incremental configuration mode based on the original configuration information or the default configuration information.

The UE sends a connection reestablishment request message to the network side device in the selected cell, including: if the UE adopts the fast rebuilding process, the UE selects a rebuilding cell in a carrier configuration set, if no suitable cell exists in the carrier configuration set, the UE selects the rebuilding cell outside the carrier configuration set, and sends a connection rebuilding request message to network side equipment in the selected rebuilding cell.

In this embodiment of the present invention, the connection reestablishment request message includes: a radio resource control protocol RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a Medium Access Control (MAC) configuration, a semi-persistent scheduling (SPS) configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: the method comprises the steps of carrier numbering, Physical Uplink Control Channel (PUCCH) configuration, Physical Downlink Shared Channel (PDSCH) configuration, Physical Uplink Shared Channel (PUSCH) configuration, power control configuration, Channel Quality Indicator (CQI) reporting configuration, monitoring reference signal (SRS) configuration, reference Signal (SR) configuration and antenna configuration;

in addition, the sending the connection reestablishment message to the UE further includes: and the UE reconfigures a lower layer according to the information of the radio resource configuration of the multi-carrier of the UE, and then sends an RRC connection reestablishment completion message to the network side equipment by using the new configuration. The lower layer at least comprises a physical layer, and can also comprise a PDCP layer, an RLC layer and an MAC layer.

Therefore, by using the method provided by the invention, the UE which has RRC connection reestablishment in the multi-carrier working state can return to the multi-carrier state as soon as possible, the signaling overhead and the state transition time delay of an air interface are saved, and the problem of PCC confusion is avoided.

To more clearly illustrate the technical solution provided by the embodiment of the present invention, aiming at the first embodiment, the second embodiment of the present invention provides a connection reestablishment method for a multi-carrier system, as shown in fig. 4, including the following steps:

step 401, if the UE triggers the connection reestablishment procedure in the multi-carrier state, the UE sends a connection reestablishment request message to the network side device in the selected cell.

The Network side device includes, but is not limited to, E-UTRAN, RNC (Radio Network Controller), NB (Node B), eNB, Relay, base station, etc., it should be noted that the Network side device is not limited to the above-mentioned devices, and all devices located on the Network side that can send RRC connection reconfiguration message to the UE are within the scope of the present invention.

The connection reestablishment request message includes, but is not limited to, an RRC connection reestablishment request message, and in practical applications, the connection reestablishment request message may be arbitrarily selected according to actual needs.

In this step, when the selected cell sends the connection reestablishment request message to the network-side device, the UE sends the connection reestablishment request message to the network-side device using the default configuration in the selected cell. Wherein the default configuration at least comprises a Medium Access Control (MAC) configuration, a semi-persistent scheduling (SPS) configuration, a physical layer configuration and the like.

It should be noted that, when the UE sends the connection reestablishment request message to the network side device in the selected cell, the UE also needs to store the configuration information of the multiple carriers at the same time; wherein, the configuration information of the multi-carrier at least comprises physical layer multi-carrier configuration, and the physical layer multi-carrier configuration at least comprises one or any combination of the following information: a carrier number, a PUCCH (Physical Uplink Control Channel) configuration, a PDSCH (Physical Downlink Shared Channel) configuration, a PUSCH (Physical Uplink Shared Channel) configuration, a power Control configuration, a CQI reporting configuration, an SRS (Sounding Reference Signal) configuration, an SR configuration, an antenna configuration, and the like.

Step 402, the network side device performs radio resource configuration on the multiple carriers of the UE according to the connection reestablishment request message.

In this step, the network side device needs to perform radio resource configuration on the multiple carriers of the UE in an incremental configuration manner in the connection reestablishment message. The connection reestablishment message corresponds to the connection reestablishment request message, for example, when the connection reestablishment request message is an RRC connection reestablishment request message, the connection reestablishment message is an RRC connection reestablishment message.

Specifically, when receiving an RRC connection reestablishment request message from the UE, the network side device needs to perform an RRC connection reestablishment procedure of the UE and send an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message needs to carry information for performing radio resource configuration on multiple carriers of the UE.

In the embodiment of the present invention, in the process of configuring the radio resource for multiple carriers of the UE, the following situations are considered:

in the first case, if the cell selected by the UE during the re-establishment is in the carrier configuration set of the UE and the UE stores the configuration information of other CCs in the previous multi-carrier CA state, the network side device needs to perform radio resource configuration on the multi-carrier of the UE in an incremental configuration manner based on the original configuration information.

In the second case, if the cell selected by the UE during the re-establishment is in the carrier configuration set of the UE and the UE stores the default configuration information of other CCs in the previous multi-carrier CA state, the network side device needs to perform radio resource configuration on the multi-carrier of the UE in an incremental configuration manner based on the default configuration information.

It should be noted that, in the first case and the second case, if the PCCs before and after the UE is reestablished are different, the network side device needs to reassign the PCC and the SCC, and perform radio resource configuration on the multiple carriers of the UE in an incremental configuration manner based on the original configuration information or the default configuration information; the process of reassigning the PCC and SCC may be performed explicitly or implicitly.

In addition, if the PCCs before and after the UE is reestablished are different, the network device also needs to release the physical layer uplink control channel configuration information of the source PCC and configure the physical layer uplink control channel configuration information for the new PCC. Wherein the physical layer uplink control channel configuration information includes: CQI, D-SR, and ACK/NACK.

And if the PCC before and after the UE is reconstructed is the same, the network side equipment directly performs radio resource configuration on the multi-carrier of the UE based on the original configuration information or the default configuration information by adopting an incremental configuration mode.

In the third case, if the cell selected by the UE during the reestablishment is not in the carrier configuration set of the UE, the UE needs to release all configuration information, and returns to the single carrier operating state to send a connection reestablishment request message to the network side device; or, the UE sends a connection reestablishment request message to the network side device in the selected cell using a default configuration.

In this case, the network side device needs to reallocate the carrier set of the UE, reassign the PCC and the SCC, and perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on the original configuration information or the default configuration information. The process of reassigning the PCC and SCC may be reassigned explicitly or implicitly.

In a fourth case, if the UE needs to use a fast re-establishment procedure, the UE needs to select a re-establishment cell within the carrier configuration set, and if there is no suitable cell within the carrier configuration set, the UE selects a re-establishment cell outside the carrier configuration set, and sends a connection re-establishment request message to the network side device in the selected re-establishment cell.

Step 403, the network side device sends an RRC connection reestablishment message to the UE. Wherein, the RRC connection reestablishment message carries information for configuring radio resources for multiple carriers of the UE.

In step 404, the UE reconfigures the lower layer according to the information of radio resource configuration for multiple carriers of the UE. Wherein, the lower layer at least comprises a physical layer, and also comprises a PDCP layer, an RLC layer and a MAC layer.

In order to further explain the above technical solution, the connection reestablishment method for the multi-carrier system provided in the embodiment of the present invention is further explained below with reference to several specific application scenarios.

Application scenario 1

In this application scenario, a multi-carrier configuration is saved for the UE, and when the PCC is not changed before and after the UE is reestablished, as shown in fig. 5, there are three cells under the base station 1, which are a cell 1 at a frequency f1, a cell 2 at a frequency f2, and a cell 3 at a frequency f3, respectively, and the UE currently operates in a carrier aggregation state and aggregates the cell 1, the cell 2, and the cell 3, where the cell 1 is the PCC, and the cell 2 and the cell 3 are the SCC.

When the UE initiates an RRC connection reestablishment procedure due to RLF occurring in the downlink PCC in a carrier aggregation state (i.e., a multi-carrier state), the UE suspends all RBs except for the SRB0, and selects the cell 1 to send a connection reestablishment request message to the base station, and at this time, the UE needs to use default MAC layer configuration, SPS configuration, and default physical layer configuration of the cell 1 on the cell 1, send the RRC connection reestablishment request message to the base station, and save physical layer configurations of other CCs (cell 2 and cell 3) in a CA state.

And after receiving the RRC connection reestablishment request message, if the base station judges to accept the reestablishment process of the UE, sending an RRC connection reestablishment message to the UE, wherein the RRC connection reestablishment message carries multi-carrier radio resource configuration information, and the multi-carrier radio resource configuration information is configured in an increment configuration mode. Wherein the radio resource configuration information of the multi-carrier includes: indicating that the cell 1 is still PCC, adopting PCC-based incremental configuration for the cell 1, and indicating that SCC-based incremental configuration (mainly physical layer configuration) is adopted for other cells.

It should be noted that the indication information may be indicated in an explicit manner or in an implicit manner, where the implicit manner may be that the cell 1 is configured according to the PCC, that is, the uplink physical control channel configuration information exists, and the UE defaults that the CC is the PCC.

Further, the UE performs low-level configuration according to the information in the RRC connection reestablishment message, recovers the SRB1 after the configuration is completed, and sends the RRC connection reestablishment complete message to the base station. At this time, the UE recovers SRB1 on multiple carriers, only PCC (cell 1) is in the activated state, and the other SCCs are still in the deactivated state.

Thereafter, in order to recover the SRBs 2 and the DRBs, the base station needs to send an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message may not carry configuration information (e.g., physical layer configuration) of the multiple carriers, i.e., the SRBs 2 and the DRBs may be recovered.

After the RRC connection reconfiguration is completed, the base station needs to activate the SCC (e.g., cell 2, cell 3) where the UE stores the configuration information using MAC signaling, so that the UE re-enters the transmission state of the CA. If SRB1 is recovered, other SCCs are default to be activated, and then MAC signaling is not required to activate the SCC subsequently, and only the SRB2 and the DRB need to be recovered by the reconfiguration process, unless the RRC connection reconfiguration message modifies the low-layer configuration of the SCC (mainly referring to physical layer configuration), the SCC needs to be reactivated by subsequent MAC signaling.

It should be noted that the physical layer configuration information includes one or more of the following: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration, antenna configuration and the like.

Application scenario 2

In this application scenario, the multi-carrier configuration is saved for the UE, and when the PCC reconstructed by the UE is still in the carrier configuration set, the schematic diagram shown in fig. 5 is continued.

When the UE initiates an RRC connection reestablishment procedure due to RLF occurring in downlink PCC in a carrier aggregation state, the UE suspends all RBs except for the SRB0, and selects the cell 2 to send a connection reestablishment request message to the base station, at this time, the UE needs to use default MAC layer configuration, SPS configuration, and default physical layer configuration of the cell 2 on the cell 2, send the RRC connection reestablishment request message to the base station, and save physical layer configurations of other CCs (cell 1 and cell 3) in a CA state.

And after receiving the RRC connection reestablishment request message, if the base station judges to accept the reestablishment process of the UE, sending an RRC connection reestablishment message to the UE, wherein the RRC connection reestablishment message carries multi-carrier radio resource configuration information, and the multi-carrier radio resource configuration information is configured in an increment configuration mode. Wherein the radio resource configuration information of the multi-carrier includes: indicating that the cell 2 is a PCC, configuring physical layer configuration information of the cell 2 as PCC, indicating that the cell 1 is an SCC, configuring physical layer configuration information of the cell 1 as SCC, and adopting an increment configuration (mainly physical layer configuration) based on SCC for other cells (cell 3).

Further, the UE performs low-level configuration according to the information in the RRC connection reestablishment message, restores the SRB1 after the configuration is completed, and sends the RRC connection reestablishment complete message to the base station. At this time, the UE recovers SRB1 on multiple carriers, only PCC (cell 2) is in an activated state, and other SCCs are still in a deactivated state; the subsequent process is similar to the application scenario 1, and details are not repeated in this application scenario.

Application scenario 3

In this application scenario, the multi-carrier configuration is saved for the UE, and when the PCC reconstructed by the UE is not in the carrier configuration set, the schematic diagram shown in fig. 5 is continued.

When the UE initiates an RRC connection reestablishment procedure due to RLF occurring in the downlink PCC in the carrier aggregation state, the UE suspends all RBs except for the SRB0, and if the UE selects a cell outside the current configuration set to initiate the RRC connection reestablishment procedure, for example, selects the cell 4 to send a connection reestablishment request message to the base station. At this time, the UE has two processing modes: 1) the UE releases all the configurations and returns to the single carrier working state to send a connection RRC reestablishment request message to the base station; 2) the UE sends an RRC connection reestablishment request message to the base station in cell 4 using the default MAC layer configuration, SPS configuration, and default physical layer configuration of cell 4.

After receiving the RRC connection reestablishment request message, if it is determined to accept the reestablishment procedure of the UE, the base station sends an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message needs to carry carrier set reconfiguration information, that is, carrier sets in which the UE operates, such as cell 1, cell 2, and cell 4, are reconfigured (cell 3 is deleted from the configured set). In addition, the RRC connection reestablishment message also needs to carry radio resource configuration information of multiple carriers, where the radio resource configuration information of the multiple carriers is configured in an incremental configuration manner. Wherein the radio resource configuration information of the multi-carrier includes: indicating that the cell 4 is a PCC, configuring physical layer configuration information of the cell 4 as the PCC (may be incremental configuration based on default configuration), indicating that the cell 1 is an SCC, configuring physical layer configuration information of the cell 1 as the SCC (may be incremental configuration based on default configuration or incremental configuration based on original configuration), and adopting incremental configuration (mainly physical layer configuration) based on the SCC for other cells (cell 2). If there are other cells newly joining the configuration set and the UE has not previously saved its configuration information, the SCC is considered to be incrementally configured based on the default configuration. The above indication information of the PCC and SCC may be explicit or implicit.

Further, the UE performs low-level configuration according to the information in the RRC connection reestablishment message, restores the SRB1 after the configuration is completed, and sends the RRC connection reestablishment complete message to the base station. The subsequent process is similar to the application scenario 1, and details are not repeated in this application scenario.

Application scenario 4

In this application scenario, the multi-carrier configuration is saved for the UE, and the situation of the fast reconstruction process is continued with the schematic diagram shown in fig. 5.

When the UE initiates an RRC connection reestablishment procedure due to RLF occurring in the downlink PCC in the carrier aggregation state, the UE suspends all RBs except for the SRB0 and performs a fast reestablishment procedure. Wherein, the fast reconstruction process specifically comprises:

firstly, selecting cells in a carrier set configured by the UE, and if no suitable cells exist in the configured set, selecting the cells out of the configured set. If a suitable cell is selected in the configuration set, corresponding processing is required to be performed according to the condition of saving the multi-carrier configuration; if the configuration set selects a suitable cell, corresponding processing is required according to the situation of releasing the multi-carrier configuration.

Specifically, if a suitable cell is selected within the configuration set, an RRC connection re-establishment procedure needs to be initiated. If the cell that initiates the re-establishment procedure is still the PCC before, the process may be performed according to the application scenario 1, but the difference from the application scenario 1 is that the UE directly recovers the SRB2 and the DRB (at this time, the SCC may be activated or not activated, and waits for the subsequent MAC signaling activation, as described in the application scenario 1) after receiving the RRC connection re-establishment message and configuring the lower layer according to the configuration information of the RRC connection re-establishment message, without the subsequent re-establishment procedure, and therefore, the UE may quickly recover the service, which is referred to as fast re-establishment.

If the cell that selects to initiate the reconfiguration process is not the PCC before, the processing is performed according to the manner of application scenario 2, which is different from application scenario 2 in that the UE directly resumes the SRB2 and the DRB (at this time, the SCC may be activated or may be deactivated, and waits for the subsequent MAC signaling activation, as described in application scenario 2) after receiving the RRC connection reconfiguration message and configuring the lower layer according to the configuration information thereof, and a subsequent reconfiguration process is not required, so the UE can quickly resume the service.

Application scenario 5

In this application scenario, the UE uses the multi-carrier default configuration to complete the reconstruction process, and continues the schematic diagram shown in fig. 5.

In the application scenario, the method can be applied to a general reconstruction process and a rapid reconstruction process. The application scenario is characterized in that the UE is allowed to complete the reestablishment process on multiple carriers, a specific carrier set may be an original set (for example, in the case of application scenario 1 and application scenario 2), or may be determined by an RRC connection reestablishment message (for example, in application scenario 3), multiple carriers all use default configuration, and the carrier initiating the RRC connection reestablishment process is the PCC.

The RRC connection reestablishment message includes multi-carrier configuration information, where a cell currently initiating the reestablishment process is PCC configuration information based on a default configuration, and other cells are SCC configuration information based on a default configuration.

After the RRC connection re-establishment procedure is completed, if it is a general re-establishment procedure, the subsequent process is the same as application scenario 1 (with a re-establishment procedure to recover SRBs 2 and DRBs), and if it is a fast re-establishment procedure, the subsequent process is the same as application scenario 4 (without a re-establishment procedure, directly recover SRBs 2 and DRBs).

Therefore, by using the method provided by the embodiment of the invention and each application scenario, the UE which has RRC connection reestablishment in the multi-carrier working state can return to the multi-carrier state as soon as possible, the signaling overhead and the state transition delay of an air interface are saved, and the problem of PCC confusion is avoided.

An embodiment of the present invention provides a connection reestablishment method for a multi-carrier system, as shown in fig. 6, including the following steps:

step 601, if the UE triggers the connection reestablishment process in the multi-carrier state, the UE sends a connection reestablishment request message to the network side device in the selected cell. Wherein, the UE sending a connection reestablishment request message to the network side device in the selected cell includes: and the UE sends a connection reestablishment request message to the network side equipment in the selected cell by using default configuration, releases the configuration information of the multiple carriers and falls back to the single carrier state.

Step 602, the network side device performs radio resource configuration on the single carrier of the UE according to the connection reestablishment request message. The method for configuring the radio resources of the single carrier of the UE by the network side device according to the connection reestablishment request message includes: and the network side equipment performs wireless resource configuration on the single carrier of the UE in a connection reestablishment message in an increment configuration mode and sends the connection reestablishment message to the UE. Wherein, the connection reestablishment message carries the information of configuring the radio resource for the single carrier of the UE.

In addition, the connection reestablishment message is sent to the UE, the RRC connection reestablishment is completed, and at this time, the UE needs to recover the signaling radio bearer 1SRB 1 at the single carrier, and then the base station makes the UE perform the CA state again through the RRC connection reconfiguration process.

It should be noted that the connection reestablishment request message includes: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following contents: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

To more clearly illustrate the technical solution provided by the embodiment of the present invention, with respect to the third embodiment, a fourth embodiment of the present invention provides a connection reestablishment method for a multi-carrier system, as shown in fig. 7, including the following steps:

step 701, if the UE triggers a connection reestablishment procedure in the multi-carrier state, the UE sends a connection reestablishment request message to the network side device in the selected cell.

In this step, when the selected cell sends the connection reestablishment request message to the network-side device, the UE sends the connection reestablishment request message to the network-side device using the default configuration in the selected cell. Wherein the default configuration at least comprises a Medium Access Control (MAC) configuration, a semi-persistent scheduling (SPS) configuration, a physical layer configuration and the like. Wherein, the physical layer configuration at least comprises one or any combination of the following information: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration, antenna configuration and the like.

It should be noted that, when the UE sends the connection reestablishment request message to the network side device in the selected cell, the UE also needs to release the configuration information of the multiple carriers at the same time and fall back to the single carrier state.

Step 702, the network side device performs radio resource allocation on the single carrier of the UE according to the connection reestablishment request message.

In this step, the network side device needs to perform radio resource allocation on the single carrier of the UE in an incremental configuration manner in the connection reestablishment message. The connection reestablishment message corresponds to the connection reestablishment request message, for example, when the connection reestablishment request message is an RRC connection reestablishment request message, the connection reestablishment message is an RRC connection reestablishment message.

Specifically, when receiving an RRC connection reestablishment request message from the UE, the network side device needs to perform an RRC connection reestablishment procedure of the UE and send an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message needs to carry information for performing radio resource configuration on a single carrier of the UE.

Step 703, the network side device sends an RRC connection reestablishment message to the UE. Wherein, the RRC connection reestablishment message carries information for configuring radio resources for the single carrier of the UE.

Step 704, after the RRC connection reestablishment is completed, the UE recovers the SRB1 at the single carrier; and then the base station enables the UE to carry out the CA state again through an RRC connection reconfiguration process.

In order to further explain the above technical solution, the connection reestablishment method for a multi-carrier system provided in the embodiment of the present invention is further described below with reference to a specific application scenario.

Application scenario 6

In this application scenario, the schematic diagram shown in fig. 5 is continued for the case where the multi-carrier configuration is released for the UE.

When the UE initiates an RRC connection reestablishment procedure due to RLF of the downlink PCC in the carrier aggregation state, the UE suspends all RBs except for the SRB0, releases the physical layer configuration of all CCs in the CA state, and falls back to the single carrier state, and sends an RRC connection reestablishment request message to the base station using the default configuration (MAC layer configuration, SPS configuration, and physical layer configuration) in the selected cell (e.g., cell 1).

After receiving the RRC connection reestablishment request message, if the base station decides to accept the reestablishment process of the UE, the base station sends an RRC connection reestablishment message to the UE, where the RRC connection reestablishment message only carries radio resource configuration information of a single carrier (i.e., a carrier-cell 1 where the UE currently initiates reestablishment), and is configured in an incremental manner.

Further, the UE performs low-level configuration according to the information in the RRC connection reestablishment message, recovers the SRB1 after the completion, and sends the RRC connection reestablishment complete message to the base station. At this time, the UE recovers SRB1 in cell 1, and only the lower layer configuration information (for example, physical layer configuration) of cell 1 is stored, and the cell can be used as PCC for subsequent CA transmission.

To recover SRBs 2 and DRBs, after the UE completes RRC connection reestablishment, the base station sends an RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message may carry configuration information (e.g., physical layer configuration) of multiple carriers, so as to recover SRBs 2 and DRBs on multiple carriers in a subsequent procedure. After the reconfiguration is completed, the base station activates the carriers (SCC) in which the configuration information is stored by the UE using MAC signaling, so that the UE re-enters the CA transmission state.

Based on the same inventive concept, a network side device provided in the fifth embodiment of the present invention, as shown in fig. 8, includes:

a receiving module 11, configured to receive a connection reestablishment request message sent from the UE to a network side device in the selected cell when the UE triggers a connection reestablishment procedure in a multi-carrier state.

A configuring module 12, configured to perform radio resource configuration on multiple carriers of the UE according to the connection reestablishment request message received by the receiving module 11.

The configuration module 12 is specifically configured to perform radio resource configuration on multiple carriers of the UE in a connection reestablishment message by using an incremental configuration mode.

In this embodiment of the present invention, the configuration module 12 is specifically configured to perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on original configuration information if the cell selected when the UE is reestablished is located in a carrier configuration set of the UE and the UE stores configuration information of other component carriers CC in a multi-carrier state.

The configuration module 12 is specifically configured to perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on default configuration information if the cell selected when the UE is reestablished is located in a carrier configuration set of the UE and the UE stores the default configuration information of other CCs in a multi-carrier state.

The configuration module 12 is specifically configured to, if PCC of the primary carrier is different before and after the UE is reestablished, reassign the PCC and the SCC, and perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on original configuration information or default configuration information; and if the PCC before and after the UE is reconstructed is the same, the radio resource configuration is carried out on the multi-carrier of the UE by adopting an incremental configuration mode directly based on the original configuration information or the default configuration information.

The configuration module 12 is specifically configured to release the physical layer uplink control channel configuration information of the source PCC and configure the physical layer uplink control channel configuration information for the new PCC, if the PCCs before and after the UE is reestablished are different.

The configuration module 12 is specifically configured to, if the cell selected when the UE is reestablished is not located in the carrier configuration set of the UE, reallocate the carrier set of the UE, reassign the PCC and the secondary carrier SCC, and perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on the original configuration information or the default configuration information.

A sending module 13, connected to the configuring module 12, configured to send the connection reestablishment message to the UE.

It should be noted that the connection reestablishment request message includes: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.

Based on the same inventive concept, a user equipment UE provided in the sixth embodiment of the present invention, as shown in fig. 9, includes:

the determining module 21 is configured to determine whether the UE triggers a connection reestablishment procedure in the multi-carrier state.

A sending module 22, configured to send a connection reestablishment request message to a network side device in the selected cell when the determination result of the determining module 21 is that the UE triggers a connection reestablishment process in a multi-carrier state; and the network side equipment performs radio resource configuration on the multi-carrier of the UE according to the connection reestablishment request message.

In this embodiment of the present invention, the sending module 22 is specifically configured to send a connection reestablishment request message to the network side device in the selected cell using a default configuration.

The sending module 22 is specifically configured to release all configurations and return to a single carrier operating state to send a connection reestablishment request message to the network side device if the cell selected when the UE is reestablished is not located in the carrier configuration set of the UE; or, a connection reestablishment request message is sent to the network side equipment by using a default configuration in the selected cell.

The sending module 22 is specifically configured to select a reestablishing cell within the carrier configuration set if the UE employs the fast reestablishment process, select a reestablishing cell outside the carrier configuration set if no suitable cell exists within the carrier configuration set, and send a connection reestablishment request message to the network side device in the selected reestablishing cell.

A storage module 23, configured to store multi-carrier configuration information when the determination result of the determining module 21 is that the UE triggers a connection reestablishment procedure in a multi-carrier state; the multi-carrier configuration information is original configuration information or default configuration information.

A configuring module 24, configured to reconfigure a lower layer according to the information that the network side device performs radio resource configuration on the multiple carriers of the UE and the multiple carrier configuration information, and send an RRC connection reestablishment complete message to the network side device by using the new configuration.

Based on the same inventive concept, a seventh embodiment of the present invention provides a network side device, as shown in fig. 10, including:

a receiving module 31, configured to receive a connection reestablishment request message sent from the UE to the network side device in the selected cell when the UE triggers a connection reestablishment procedure in the multi-carrier state.

A configuring module 32, configured to perform radio resource configuration on a single carrier of the UE according to the connection reestablishment request message received by the receiving module 32.

The configuration module 32 is specifically configured to perform radio resource configuration on the single carrier of the UE in a manner of incremental configuration in the connection reestablishment message.

A sending module 33, connected to the configuring module 32, configured to send the connection reestablishment message to the UE.

In this embodiment of the present invention, the connection reestablishment request message includes: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

Based on the same inventive concept, an eighth user equipment UE provided in the embodiment of the present invention, as shown in fig. 11, includes:

a determining module 41, configured to determine whether the UE triggers a connection reestablishment procedure in the multi-carrier state.

A sending module 42, configured to send a connection reestablishment request message to a network side device in the selected cell when the determination result of the determining module 41 is that the UE triggers a connection reestablishment process in a multi-carrier state; and the network side equipment performs wireless resource configuration on the single carrier of the UE according to the connection reestablishment request message.

The sending module 42 is specifically configured to send a connection reestablishment request message to the network side device in the selected cell by using a default configuration, release the configuration information of the multiple carriers, and fall back to the single carrier state.

And the processing module 43 is connected to the sending module 42, and is configured to recover the SRB1 at the single carrier and re-enter the multi-carrier state through an RRC connection reconfiguration procedure.

It can be seen that, by using the devices provided in the embodiments of the present invention, the UE having RRC connection reestablishment in the multi-carrier working state can return to the multi-carrier state as soon as possible, and signaling overhead and state transition delay of an air interface are saved, and the problem of PCC confusion is avoided.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.

Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. A method for connection reestablishment in a multi-carrier system, comprising:

the network side equipment performs wireless resource configuration on the multi-carrier of the UE according to the connection reestablishment request message;

wherein, the receiving, by the network side device, a connection reestablishment request message from the UE to the network side device in the selected cell includes: the network side equipment receives a connection reestablishment request message sent to the network side equipment by the UE in the selected cell by using default configuration;

the network side device performs radio resource configuration on the multiple carriers of the UE according to the connection reestablishment request message, including: the network side equipment performs wireless resource configuration on the multi-carrier of the UE in a connection reestablishment message in an increment configuration mode and sends the connection reestablishment message to the UE;

the method for the network side equipment to perform radio resource configuration on the multiple carriers of the UE in the connection reestablishment message by adopting an increment configuration mode comprises the following steps: if the selected cell is not located in the carrier configuration set of the UE when the UE is reestablished, the network side device reallocates the carrier configuration set of the UE, reassigns the primary carrier PCC and the secondary carrier SCC, and performs radio resource configuration on the multiple carriers of the UE in an incremental configuration mode based on the original configuration information or the default configuration information.

2. The method of claim 1, wherein the configuring, by the network side device, radio resources for multiple carriers of the UE in a connection reestablishment message by using an incremental configuration manner includes: and if the selected cell is positioned in the carrier configuration set of the UE when the UE is reconstructed and the UE stores the configuration information of other Component Carriers (CC) in a multi-carrier state, the network side equipment performs radio resource configuration on the multi-carrier of the UE by adopting an incremental configuration mode based on the original configuration information.

3. The method of claim 1, wherein the configuring, by the network side device, radio resources for multiple carriers of the UE in a connection reestablishment message by using an incremental configuration manner includes:

if the selected cell is located in the carrier configuration set of the UE when the UE is reestablished and the UE stores the default configuration information of other CCs in the multi-carrier state, the network side equipment performs radio resource configuration on the multi-carrier of the UE by adopting an incremental configuration mode based on the default configuration information.

4. The method of claim 2 or 3, wherein the configuring, by the network side device, the radio resources for multiple carriers of the UE in a connection reestablishment message by using an incremental configuration manner includes:

if the PCC of the primary carrier before and after the UE is rebuilt is different, the network side equipment reassigns the PCC and the SCC, and performs wireless resource configuration on the multi-carrier of the UE in an incremental configuration mode based on the original configuration information or default configuration information;

and if the PCCs before and after the UE is reconstructed are the same, the network side equipment directly performs radio resource configuration on the multi-carrier of the UE based on the original configuration information or the default configuration information in an incremental configuration mode.

5. The method of claim 4, wherein the configuring, by the network side device, radio resources for multiple carriers of the UE in a connection reestablishment message by using an incremental configuration manner includes:

if the PCCs before and after the UE is reestablished are different, the network side device needs to release the physical layer uplink control channel configuration information of the source PCC and configure the physical layer uplink control channel configuration information for the new PCC.

6. The method of claim 1, wherein the connection reestablishment request message comprises: a radio resource control protocol RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a Medium Access Control (MAC) configuration, a semi-persistent scheduling (SPS) configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: the method comprises the steps of carrier numbering, Physical Uplink Control Channel (PUCCH) configuration, Physical Downlink Shared Channel (PDSCH) configuration, Physical Uplink Shared Channel (PUSCH) configuration, power control configuration, Channel Quality Indicator (CQI) reporting configuration, monitoring reference signal (SRS) configuration, reference Signal (SR) configuration and antenna configuration.

7. A network-side device, comprising:

a configuration module, configured to perform radio resource configuration on multiple carriers of the UE according to the connection reestablishment request message received by the receiving module; the configuration module is specifically configured to perform radio resource configuration on multiple carriers of the UE in a connection reestablishment message in an incremental configuration manner;

the network side device further includes: a sending module, configured to send the connection reestablishment message to the UE;

the configuration module is specifically configured to, if the cell selected by the UE during the re-establishment is not located in the carrier configuration set of the UE, re-allocate the carrier configuration set of the UE, re-designate the primary carrier PCC and the secondary carrier SCC, and perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on the original configuration information or the default configuration information.

8. The network-side device of claim 7, wherein the configuration module is specifically configured to perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on original configuration information if the selected cell is located in a carrier configuration set of the UE when the UE is reestablished and the UE stores configuration information of other component carriers CC in a multi-carrier state.

9. The network-side device of claim 7,

the configuration module is specifically configured to perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on default configuration information if the cell selected by the UE during re-establishment is located in a carrier configuration set of the UE and the UE stores default configuration information of other CCs in a multi-carrier state.

10. The network-side device of claim 8 or 9,

the configuration module is specifically configured to, if PCC of the primary carrier is different before and after the UE is reestablished, reassign the PCC and the secondary carrier SCC, and perform radio resource configuration on multiple carriers of the UE in an incremental configuration manner based on original configuration information or default configuration information;

and if the PCC before and after the UE is reconstructed is the same, the radio resource configuration is carried out on the multi-carrier of the UE by adopting an incremental configuration mode directly based on the original configuration information or the default configuration information.

11. The network-side device of claim 10,

the configuration module is specifically configured to release the physical layer uplink control channel configuration information of the source PCC and configure the physical layer uplink control channel configuration information for the new PCC, if the PCCs before and after the UE is reestablished are different.

12. The network-side device of claim 7, wherein the connection reestablishment request message comprises: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

13. A method for connection reestablishment in a multi-carrier system, comprising:

if the UE triggers a connection reestablishment process in a multi-carrier state, sending a connection reestablishment request message to network side equipment in the selected cell; the network side equipment performs wireless resource configuration on the multi-carrier of the UE according to the connection reestablishment request message;

wherein, sending a connection reestablishment request message to the network side device in the selected cell includes:

if the selected cell is not located in the carrier configuration set of the UE when the UE is reestablished, the UE releases all configurations and returns to a single carrier working state to send a connection reestablishment request message to network side equipment; or, the UE reserves the multi-carrier configuration information, and sends a connection reestablishment request message to the network side device in the selected cell using a default configuration; the multi-carrier configuration information is original configuration information or default configuration information.

14. The method of claim 13, wherein sending a connection reestablishment request message to the network-side device at the selected cell comprises:

if the UE adopts the fast rebuilding process, the UE selects a rebuilding cell in a carrier configuration set, if no suitable cell exists in the carrier configuration set, the UE selects the rebuilding cell outside the carrier configuration set, and sends a connection rebuilding request message to network side equipment in the selected rebuilding cell.

15. The method of claim 14, wherein the network side device performs radio resource configuration on multiple carriers of the UE according to the connection reestablishment request message, and then further comprising:

the UE reconfigures a lower layer according to the information of radio resource configuration of the multi-carrier of the UE and sends an RRC connection reestablishment completion message to the network side equipment by using the new configuration; wherein the lower layer includes a PDCP layer, an RLC layer, a MAC layer, and a physical layer.

16. A User Equipment (UE), comprising:

a sending module, configured to send a connection reestablishment request message to a network side device in the selected cell when a determination result of the determining module is that the UE triggers a connection reestablishment process in a multi-carrier state; the network side equipment performs wireless resource configuration on the multi-carrier of the UE according to the connection reestablishment request message;

the sending module is specifically configured to release all configurations and return to a single carrier operating state to send a connection reestablishment request message to a network side device if the selected cell is not located in the carrier configuration set of the UE when the UE is reestablished; or,

and sending a connection reestablishment request message to the network side equipment by using default configuration in the selected cell.

17. The UE of claim 16,

the sending module is specifically configured to select a reestablishing cell within a carrier configuration set if the UE employs a fast reestablishment process, select a reestablishing cell outside the carrier configuration set if no suitable cell exists within the carrier configuration set, and send a connection reestablishment request message to a network side device in the selected reestablishing cell.

18. The UE of claim 16, further comprising:

the storage module is used for storing multi-carrier configuration information when the judgment result of the judgment module is that the UE triggers a connection reestablishment process in a multi-carrier state; the multi-carrier configuration information is original configuration information or default configuration information;

a configuration module, configured to reconfigure a lower layer according to the information about radio resource configuration of the network side device for the multiple carriers of the UE and the multiple carrier configuration information, and send an RRC connection reestablishment complete message to the network side device by using the new configuration.

19. A method for connection reestablishment in a multi-carrier system, comprising:

if the UE triggers a connection reestablishment process in a multi-carrier state, the network side equipment receives a connection reestablishment request message sent to the network side equipment from the UE in the selected cell; the connection reestablishment request message is sent to the network side equipment by the UE in the selected cell by using default configuration, so that the UE releases multi-carrier configuration information and falls back to a single carrier state;

20. The method of claim 19, wherein the network side device receiving a connection reestablishment request message from the UE to the network side device in the selected cell comprises:

the network side equipment receives a connection reestablishment request message sent to the network side equipment by the UE in the selected cell by using default configuration;

the network side device performs radio resource configuration on the single carrier of the UE according to the connection reestablishment request message, including:

and the network side equipment performs wireless resource configuration on the single carrier of the UE in a connection reestablishment message in an increment configuration mode and sends the connection reestablishment message to the UE.

21. The method of claim 20, wherein the connection reestablishment request message comprises: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following contents: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

22. A network-side device, comprising:

a receiving module, configured to receive a connection reestablishment request message sent from a UE to a network side device in a selected cell when the UE triggers a connection reestablishment process in a multi-carrier state; the connection reestablishment request message is sent to the network side equipment by the UE in the selected cell by using default configuration, so that the UE releases multi-carrier configuration information and falls back to a single carrier state;

23. The network-side device of claim 22,

the configuration module is specifically configured to perform radio resource configuration on a single carrier of the UE in a connection reestablishment message by using an incremental configuration manner;

the network side device further includes:

a sending module, configured to send the connection reestablishment message to the UE.

24. The network-side device of claim 23, wherein the connection reestablishment request message comprises: an RRC connection reestablishment request message; the connection reestablishment message includes: an RRC connection reestablishment message; the default configuration comprises a MAC configuration, an SPS configuration and a physical layer configuration; the physical layer configuration comprises one or more of the following: carrier number, PUCCH configuration, PDSCH configuration, PUSCH configuration, power control configuration, CQI reporting configuration, SRS configuration, SR configuration and antenna configuration.

25. A method for connection reestablishment in a multi-carrier system, comprising:

if the UE triggers a connection reestablishment process in a multi-carrier state, the UE sends a connection reestablishment request message to network side equipment in the selected cell; performing, by the network side device, radio resource configuration on a single carrier of the UE according to the connection reestablishment request message;

wherein, the UE sending a connection reestablishment request message to the network side device in the selected cell includes:

and the UE sends a connection reestablishment request message to the network side equipment in the selected cell by using default configuration, releases the configuration information of the multiple carriers and falls back to the single carrier state.

26. The method of claim 25, wherein the UE sends a connection reestablishment request message to the network side device at the selected cell, and thereafter further comprising:

the UE restores the signaling radio bearer SRB1 at the single carrier and reenters the multi-carrier state through the RRC connection reconfiguration process.

27. A User Equipment (UE), comprising:

a sending module, configured to send a connection reestablishment request message to a network side device in the selected cell when a determination result of the determining module is that the UE triggers a connection reestablishment process in a multi-carrier state; performing, by the network side device, radio resource configuration on a single carrier of the UE according to the connection reestablishment request message;

the sending module is specifically configured to send a connection reestablishment request message to the network side device using a default configuration in the selected cell, release the configuration information of the multiple carriers, and fallback to the single carrier state.

28. The UE of claim 27, further comprising:

and the processing module is used for recovering the SRB1 in the single carrier and reentering the multi-carrier state through an RRC connection reconfiguration process.