KR20120111358A - Apparatus and method for transmitting and receiving uplink synchronization information in wireless communication system - Google Patents

Abstract

An apparatus and method for transmitting and receiving uplink synchronization information in a wireless communication system are provided.
According to an embodiment of the present disclosure, the terminal calculates timing correction information of each of the secondary serving cells based on timing correction information of the main serving cell, or performs timing correction by receiving offset information for each serving cell. . The terminal may receive the offset information through an RRC message or a MAC message. Accordingly, the terminal provides an advantage of efficiently supporting uplink synchronization of a plurality of serving cells or component carriers.

Description

Apparatus and method for transmitting and receiving uplink synchronization information in a wireless communication system {APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING UPLINK SYNCHRONIZATION INFORMATION IN WIRELESS COMMUNICATION SYSTEM}

An apparatus and method for transmitting and receiving uplink synchronization information in a wireless communication system, and more particularly, an apparatus and method for setting uplink synchronization for at least one component carrier.

In a wireless communication system, synchronization between a user terminal and a base station is an important problem. This is because the user terminal and the base station cannot exchange normal information without synchronization.

On the other hand, unlike existing wireless communication systems that support one component carrier or one service band, the current wireless communication system uses a plurality of component carriers to satisfy user service requirements. However, there is no specific discussion on how to provide synchronization of synchronization information for the plurality of CCs.

In other words, in order to perform communication, synchronization is a factor that greatly affects the efficiency of the network, and in view of such factors, there is a need for a method of effectively providing information required for uplink synchronization.

Since the efficiency of the synchronization process is directly related to the efficiency of the network, and the security of transmission is also guaranteed, the present invention provides efficient uplink synchronization in a multi-carrier aggregation environment in a wireless communication network environment operating a multi-carrier. It is intended to provide a method and apparatus.

An object of the present invention is to provide an apparatus and method for establishing synchronization by providing uplink timing information in a wireless communication system.

The present invention also provides an apparatus and method for transmitting and receiving information for uplink timing in order to establish synchronization in a wireless communication system.

The present invention also provides a terminal apparatus and method for providing synchronization information on each component carrier through an RRC connection reconfiguration procedure in a wireless communication system and then providing detailed synchronization information to establish synchronization with a base station. To provide.

In order to achieve the above object, the method for receiving uplink synchronization information according to an embodiment of the present disclosure, to receive the offset information required to adjust the uplink timing synchronization in a wireless communication system consisting of one or more component carriers Receiving timing correction information of the first cell from the base station, calculating timing correction information of the second cell based on the received timing correction information of the first cell, and calculating the timing correction information of the calculated second cell Transmitting a reference signal using the signal; receiving offset information necessary for adjusting an error of timing correction information of the second cell from the base station; and receiving the received offset information and timing correction information of the second cell. And setting uplink timing correction information of the second cell by using the first cell. It characterized in that the primary serving cell to perform the extra access procedure.

According to another embodiment of the present disclosure, a method of transmitting uplink synchronization information includes timing correction information of a first cell in order to transmit offset information necessary to adjust uplink timing synchronization in a wireless communication system including one or more component carriers. Transmitting a reference signal transmitted by the user terminal based on the timing correction information of the second cell calculated by the user terminal, and transmitting the second signal by using the received reference signal. Calculating offset information necessary for setting uplink timing correction information of the second cell and transmitting the offset information to the user terminal, wherein the uplink timing correction information of the second cell includes the offset information and timing correction information of the second cell. The first cell is set by using a primary serving cell for performing a random access procedure. The.

An apparatus for receiving uplink synchronization information according to another embodiment of the present specification is configured to receive offset information necessary for adjusting uplink timing synchronization in a wireless communication system including one or more component carriers, from a base station to a first cell. A receiver configured to receive timing correction information, a timing controller configured to calculate timing correction information of a second cell based on the received timing correction information of the first cell, and the calculated timing correction information of the second cell. And a transmitter for transmitting a reference signal through two cells, and when the receiver receives offset information necessary for adjusting an error of the timing correction information of the second cell from the base station, the timing controller receives the offset information received. Setting uplink timing correction information of the second cell using And also characterized in that the first cell is a primary serving cell to perform a random access procedure.

An apparatus for transmitting uplink synchronization information according to another embodiment of the present disclosure may include timing correction of a first cell in order to transmit offset information necessary for adjusting uplink timing synchronization in a wireless communication system including one or more component carriers. A transmitter for transmitting information to a user terminal, a receiver for receiving a reference signal transmitted by the user terminal based on timing correction information of the second cell calculated by the user terminal, and the second using the received reference signal A timing correction information generation unit for calculating offset information required for setting uplink timing correction information of a cell, wherein the transmitter transmits the offset information to the user terminal, and the uplink timing correction information of the second cell It is set using the offset information and the timing correction information of the second cell, The first cell is characterized in that the primary serving cell performing a random access procedure.

1 is a view showing an example of a system using a plurality of component carriers to which the present invention is applied.
2 is a diagram illustrating an example related to timing correction (TA) in a synchronization process to which the present invention is applied.
3 is a diagram illustrating a random access procedure between a UE and an eNB.
4 is a diagram illustrating a case in which downlink TA values of a primary serving cell and a secondary serving cell are applied to an uplink TA.
FIG. 5 is a diagram illustrating a process of adjusting a TA of a SCell by a UE according to an embodiment of the present specification.
6 is a diagram illustrating a process of providing TA information of a SCell of a UE by the eNB according to an embodiment of the present specification.
7 is a diagram of transmission and reception through RRC according to one embodiment of the present specification.
FIG. 8 is a diagram illustrating an example in which a TA offset value is included in a specific IE included in an RRC connection reconfiguration message so that a TA offset can be transmitted and received through RRC according to an embodiment of the present specification.
9 illustrates a structure of a MAC for providing offset information using a MAC according to another embodiment of the present specification.
FIG. 10 is a diagram illustrating a configuration of a MAC CE including information indicating an offset according to an embodiment of the present specification.
FIG. 11 is a diagram illustrating a configuration of a MAC CE including information indicating an offset according to another embodiment of the present specification.
FIG. 12 is a diagram of storing information related to a TA offset in a MAC PDU when a currently configured or activated serving cell is CC1, CC2, or CC4 according to an embodiment of the present specification.
FIG. 13 is a diagram illustrating offset information including indicator information according to another embodiment of the present specification. FIG.
14 is a diagram illustrating a configuration of a UE according to an embodiment of the present specification.
FIG. 15 is a diagram illustrating a configuration of an eNB according to an embodiment of the present specification. FIG.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

In addition, the present specification describes a wireless communication system as an example, and the work performed in the wireless communication is characterized in that it includes all the operations performed in the system that controls the wireless communication and the wireless communication device that transmits data with the system.

In the present invention, a wireless communication system provides various communication services such as voice and packet data.

The wireless communication system includes, for example, a terminal and an evolved Node-B (eNB).

A terminal in the present specification is a generic concept meaning a user terminal in wireless communication, and UEs in WCDMA and Long Term Evolution (LTE), HSPA, etc., as well as MS (Mobile Station), UT (User Terminal), in GSM, It should be interpreted as a concept that includes both a subscriber station (SS), a wireless device, and the like.

An eNB or cell generally refers to a fixed station that communicates with a UE. In other terms, such as Node-B, Node B, Base Transceiver System, or Access Point, etc. Can be called.

In the present specification, an eNB or a cell should be interpreted in a comprehensive sense, indicating some areas covered by a base station controller (BSC) in a CDMA, a radio network controller (RNC) in a WCDMA, and the like. It should be interpreted as meaning covering all coverage areas of various cells such as picocell and femtocell.

In the present specification, the UE and the eNB are two transmitting and receiving entities used in implementing the technology or the technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to.

In addition, there is no limitation on the multiple access scheme applied to the wireless communication system in the present specification. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

One embodiment of the present specification is to asynchronous radio communication evolving to LTE and LTE-A (LTE-Avanced) through GSM, WCDMA, HSPA, and resource allocation such as synchronous radio communication evolving to CDMA, CDMA-2000 and UMB Can be applied. The embodiments presented in this specification should not be construed as being limited or limited to a specific wireless communication field, but should be interpreted as including all technical fields to which the technical spirit of the present specification may be applied.

In the present specification, in order to distinguish a plurality of component carriers (component carriers, or 'CC'), it may be indicated as CC and may be indicated as CC0 and CC1. However, the numbers included in these component carriers do not coincide with the order of the component carriers or the positions of the frequency bands of the component carriers.

1 is a view showing an example of a wireless communication system using a plurality of component carriers to which the present invention is applied.

Referring to FIG. 1, a wireless communication system to which the present invention is applied is an LTE / LTE-A system as a next generation communication system.

The LTE / LTE-A system defines the use of a component carrier or a component carrier, which is a plurality of unit carriers, as a method for extending a system requirement, that is, a bandwidth for satisfying a high data rate. Here, one CC may have a bandwidth of up to 20 MHz, and resources can be allocated within 20 MHz according to a corresponding service, but this is an embodiment according to a process of implementing a system, and depending on the configuration of the system, a bandwidth of 20 MHz or more It can also be set to have In addition, it is possible to define the use of a carrier aggregation (hereinafter referred to as "CA") that bundles a plurality of component carriers (Component Carriers) to use as one system band.

As shown in FIG. 1, when five component carriers having a maximum bandwidth of 20 MHz are used as an example, the bandwidth can be extended up to 100 MHz to support quality of service. In this case, the frequency band that may be determined by each component carrier, that is, the assignable frequency band may be contiguous or non-contiguous according to the scheduling of the actual CA.

That is, in the present specification, in order to distinguish a plurality of CCs, CCs may be indicated and indicated as CC0 and CC1. However, the numbers included in these component carriers do not coincide with the order of the component carriers or the position of the frequency band of the component carriers.

1, the first component carriers CC1 and 110, the second component carriers CC2 and 120, the third component carriers CC3 and 130, and the Nth component carriers CCN and 140 are respectively configured. The CC of the uplink (UL) or the downlink (DL) may be allocated differently according to a scheduler, or the same uplink and downlink may be allocated and used together. The component carrier may be one component carrier. Meanwhile, in the present specification, one or more component carriers may belong to one group. That is, a component carrier belonging to a group means that one or more component carriers constitute one group, and a group including only one component carrier may exist.

On the other hand, in a wireless communication environment, a propagation delay is encountered while a radio wave is transmitted from a transmitter and transmitted from a receiver. Therefore, even if the transmitter and the receiver both know the time at which the radio wave is propagated correctly, the arrival time of the signal to the receiver is influenced by the transmission / reception period distance and the surrounding propagation environment. If the receiver does not know exactly when the signal transmitted by the transmitter is received, it will receive the distorted signal even if it fails to receive or receive the signal.

Therefore, in a wireless communication system, synchronization between the eNB and the UE must be preempted in order to receive the information signal regardless of the downlink / uplink. That is, the synchronization acquisition procedure is a very important procedure in the communication system, and maintaining it also greatly affects system stability and communication quality.

On the other hand, there are various types of synchronization, such as frame synchronization, information symbol synchronization, sampling period synchronization, etc. Among them, the sampling period synchronization may be the most basically obtained synchronization to distinguish physical signals.

In the downlink transmission, which is a communication link in the direction of transmission from the eNB to the UE, synchronization acquisition is made based on the signal of the eNB at the UE. The eNB transmits a specific signal mutually promised to facilitate downlink synchronization at the UE, and based on this, the UE should be able to accurately discern the time when the specific signal transmitted from the eNB is transmitted. In the case of the downlink, since one eNB transmits the same synchronization signal to multiple UEs at the same time, each of the UEs may independently acquire synchronization through the synchronization signal.

However, since the eNB receives signals transmitted from a plurality of UEs, the eNB cannot acquire synchronization based on any one UE. Therefore, downlink and other acquisition procedures are needed.

Therefore, when the distance between each UE and eNB has a different transmission delay time, and when uplink information is transmitted based on the acquired downlink synchronization, the information of each UE is received at the corresponding eNB at different times. Will be.

That is, even if uplink information of each UE is received at different times, such as CDMA, even if uplink information is received at a different time, the complexity may be increased but the information may be received without significant problems. have. However, in a wireless communication system based on OFDMA or FDMA, since the eNB simultaneously receives uplink transmission information of all UEs and demodulates them all at once, the reception performance increases as the time is correctly received and the reception time of each UE signal at the eNB. The larger the difference is, the faster the reception performance deteriorates.

Therefore, in a wireless communication system using OFDMA or SC-FDMA such as LTE as the uplink transmission scheme, a random access scheme for each UE is used to obtain transmission delay time in the downlink and transmission delay time in the uplink. The timing alignment is calculated using the timing alignment value, and the uplink synchronization is acquired by informing each UE.

2 is a diagram illustrating an example related to a timing advance (TA) in a synchronization process to which the present invention is applied.

In general, in order for the eNB and the UE to communicate, the uplink radio frame i 220 must be transmitted to coincide with the time point when the downlink radio frame i 210 is transmitted. However, a time difference occurs due to propagation delay between the UE and the eNB.

Accordingly, in consideration of such propagation delay, TA (Timing Advance) 230 may be applied as a scheme for synchronizing the UEs of the eNB by transmitting the uplink radio frame i 220 slightly earlier than the downlink frame i 210. Can be. Looking at the formula for calculating the TA is as follows.

[Equation 1]

Here, N _TA is a variable value controlled according to TA command information from an eNB, and N _TAoffset is a value fixedly set according to a frame structure. On the other hand, T _s means the sampling period. As can be seen in FIG. 2, in order to achieve uplink synchronization, the UE may receive TA command information provided by the eNB and proceed with TA based thereon. Thus, synchronization is obtained for wireless communication with the eNB.

3 is a diagram illustrating a random access procedure between a UE and an eNB.

Referring to FIG. 3, the UE 380 needs uplink synchronization to transmit / receive data with the eNB 390. For uplink synchronization, a process of receiving information required for synchronization from the eNB 390 may be performed. 3 illustrates a process of performing a random access procedure for receiving information necessary for synchronization. The random access procedure may be applied even when the UE newly joins the network through handover or the like, and after joining the network, may proceed in various situations such as synchronization or state change (RRC_IDLE to RRC_CONNECTED).

The UE 380 first selects a preamble signature randomly to generate a random access preamble. The selected preamble is transmitted to the eNB 390 (S310). When selecting a preamble signature, the contention may proceed contention-based. On the other hand, a contention-free approach can be used. In this case, the eNB informs the UE of the pre-booked random access preamble and the UE transmits the selected preamble to the eNB 390 based on the received information (S310). In addition, in a contention-based method, a procedure such as a CR message required in the contention-based method may not be performed.

In this case, the UE 380 may recognize a random access-radio network temporary identifier (RA-RNTI) in consideration of a frequency resource and a transmission time temporarily selected for preamble selection or RACH transmission.

The eNB 390 performs a random access response (RAR) on the preamble of the received UE, wherein the random access response message is transmitted through a physical downlink shared channel (PDSCH). Send.

The information transmitted through the RAR message may include, for example, identification information of a UE preamble received by an eNB, an identifier (ID) of an eNB, a temporary Cell Radio Network Temporary Identifier (C-RNTI), and the UE preamble. Information about one time slot and TA information may be included. Accordingly, since timing information for uplink synchronization is received through the RAR message, the UE 380 may perform uplink synchronization with the eNB 390. The UE 380 performs scheduled transmission at a scheduled time point determined using the TA information received in step S320 (S330). It transmits synchronized data through a physical uplink shared channel (PUSCH), and may perform HARQ (Hybrid Automatic Repeat reQuest).

The message transmitted in step S330 may include, for example, an RRC connection request, a tracking area update, a scheduling request, and the like. In addition, one of the messages may include a temporary C-RNTI, if the UE already has one (C-RNTI), or UE identifier information.

On the other hand, since collision may occur in steps S310 to 330, when the eNB 390 transmits a CR message (Contention resoultion) (S340), the UE 380 i) the message received by the UE 380 is itself. Ii) confirm that the received message is that of another UE and do not send response data. Of course, if you miss the downlink assignment or fail to decode the message, no response data will be sent. In addition, the CR message may include C-RNTI or UE identifier information.

Unlike the process of acquiring TA in the case of using one carrier, in a wireless system operating a plurality of component carriers to which the present invention is applied, the positions of the center frequencies between the component carriers are greatly spaced or each component carrier If the devices in the supporting network are not the same, the values of the TAs between the CCs are likely to be different.

Therefore, when the synchronization acquisition scheme used in the single carrier is used as it is, it is difficult to obtain uplink synchronization for all component carriers of the plurality of component carriers. Therefore, the UE performs stable uplink communication only for some component carriers that have acquired uplink synchronization among available component carriers.

In addition, if the UE transmits information through the same uplink synchronization criteria for component carriers having different uplink synchronization criteria, a transmission error is very likely to occur and may cause time and resource waste to recover it. In such a case, it may be difficult to satisfy the uplink quality of service (QoS) for the application required in the system.

In addition, if a plurality of component carriers are operated in a wireless communication system, the transmission delay time may be different for each downlink CC according to the characteristics of each component carrier and a support method in a wireless network for a single UE. In the case of configuring a component carrier or component carriers having the same TA value, uplink synchronization criteria for each component carrier set may be different from each other, resulting in uplink performance degradation.

Therefore, in the present specification, it is possible to transmit information on uplink synchronization timing in a wireless communication system using a plurality of CCs, and to allow the terminal to generate / apply additional uplink synchronization timing information using this information. .

In a CA environment, the UE in IDLE mode selects one downlink component carrier for a radio resource control connection and receives system information through a broadcasting channel transmitted through the selected component carrier. Based on the received system information, the selected downlink component carrier and the uplink component carrier connected to the downlink component carrier are configured as a primary serving cell (PCell). The UE transmits a radio resource control connection request message to the eNB through the configured PCell. In this case, the UE may transmit the radio resource control connection request message to the eNB using the RACH procedure.

Here, the downlink component carrier corresponding to the main serving cell is referred to as a downlink component carrier (DL PCC), and the uplink component carrier corresponding to the main serving cell is referred to as an uplink component carrier (UL PCC). In the downlink, a component carrier corresponding to a secondary serving cell (SCell), not a main serving cell, is referred to as a DL subcarrier (DL SCC), and in the uplink, the component carrier corresponds to a secondary serving cell. The component carrier is called an uplink subcomponent carrier (UL SCC).

On the other hand, the main serving cell and the secondary serving cell has the following characteristics.

First, the primary serving cell is used for transmission of the PUCCH.

Second, the main serving cell is always activated, while the secondary serving cell is a carrier that is activated / deactivated according to a specific condition.

Third, when the primary serving cell experiences RLF, RRC reconnection is triggered, but when the secondary serving cell experiences RLF, RRC reconnection is not triggered.

Fourth, the main serving cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure. In the case of MSG4 (contention resolution), however, only a downlink control channel (hereinafter referred to as 'PDCCH') indicating MSG4 should be transmitted through the primary serving cell and the MSG4 information may be transmitted to the primary serving cell or secondary serving cell. It can be transmitted through.

Fifth, NAS (non-access stratum) information is received through the main serving cell.

Sixth, the main serving cell always consists of DL PCC and UL PCC in pairs.

Seventh, a different CC may be set as a primary serving cell for each terminal.

Eighth, procedures such as reconfiguration, adding, and removal of the secondary serving cell may be performed by the radio resource control (RRC) layer. In addition to the new secondary serving cell, RRC signaling may be used to transmit the system information of the dedicated secondary serving cell.

The technical spirit of the primary serving cell and the secondary serving cell of the present specification is not necessarily limited to the above description, which is merely an example and may include more examples.

When such a main serving cell and a secondary serving cell exist, a TA value may be set for each cell as shown in FIG. 4.

4 is a diagram illustrating a case in which downlink TA values of a primary serving cell and a secondary serving cell are applied to an uplink TA. In FIG. 4, CC1 is a PCell and CC2 is a SCell. When the eNB transmits the frame through the DL CC1 and the DL CC2 at the time T_Send as shown in 410, the UE receives the frame through the DL CC1 and the DL CC2 as shown in 420. At this time, the UE receives a frame with a time difference by a propagation delay time after the time T_Send transmitted by the eNB. That is, since propagation delay is generated as much as T1 in DL CC1, the radio wave is received with a time difference as much as the propagation delay time, and DL CC2 is received with a propagation delay time as much as T2.

If it is assumed that the propagation delay time of the DL transmission is the same as the propagation delay time of the UL transmission, the UE applies the TAs of T1 and T2 to the UL CC1 and the UL CC2 of the PCell and the SCell, respectively, to advance the time frame to the eNB as shown in 430. Can be sent. As a result, the eNB may receive a frame transmitted by the UE through UL CC1 and UL CC2 at a T_Receive time point configured for uplink synchronization, as shown at 440. This assumes a case where the eNB receives the UL CC1 and the UL CC2 through a single receiver.

Therefore, when the eNB configures an apparatus capable of receiving each UL CC independently, the T_Receive timing set by the eNB does not need to be the same for all UL CCs. That is, a T_Receive time point may be set for each UL CC. However, an arrival time point of an uplink frame transmitted by UEs using each UL CC should be the same as each T_Receive time point configured for each UL CC.

Here, the TA value of the SCell based on the PCell may be calculated by using offset information. The offset may optionally include a value of T3. This may be applied differently when the UE measures T3 and when it does not.

Looking at the case where the UE measures T3 according to an embodiment of the present disclosure, the UE may perform the following process.

That is, the UE acquires a TA value T1 in the PCell through a random access procedure of the PCell (DL CC1). When the UE further configures a SCell other than the PCell (the TA reference CC is DL CC2), the reception time difference value T3 between the PCell and the DL CC of the SCell is measured.

Thereafter, the UE calculates T2, which is the TA value of the SCell, by adding T1, which is the TA value of the PCell, and T3, which is a difference between DL CC reception time between the PCell and the SCell. In addition, T2 may be finally calculated by further considering an offset value. That is, an offset may be added to T1 and T3 as in "T2 = T1 + T3 + offset".

This may be applied when i) the propagation delay difference due to the difference in the frequency bands of the DL CC and the UL CC, or ii) the transmission time T_Send time of each DL CC is different from each other. For example, when the DL CC1 and the DL CC2 are transmitted through different transmitters, it may be difficult to ideally transmit at exactly the same time. In general, the transmission time may vary by 1.6 microseconds (uS) or more. The offset may be received through RRC. iii) It may be applied to the case of changing the main uplink receiving apparatus.

In the case of changing the main uplink receiving apparatus, for example, changing from eNB to Remote Radio Head (RRH), changing from eNB to relay, or changing from eNB to frequency selective repeater (FSR) Cases and the like. In this case, the DL is made in the eNB, but since the UL receiving apparatus becomes an RRH, a relay, or an FSR, it is difficult to apply the TA calculated in the DL CC to the UL CC as it is.

The offset value applied to obtain the uplink TA may be transmitted to an RRC or a medium access control (MAC) control element (CE).

According to another embodiment of the present specification, when the UE does not measure T3, the offset may include a T3 value. In this case, the UE may calculate the T2 value by adding an offset to the T1 value. That is, it can be calculated as "T2 = T1 + offset". Looking in more detail as follows.

The UE receives configuration information on the SCell including the UL CC from the eNB through information reconfiguring the RRC.

At this time, a semi-static offset value (large offset change value according to the receiving device) is reflected from the eNB in UL configuration information during uplink transmission.

After configuring the SCell, the UE transmits a periodic or aperiodic sounding reference signal (SRS) to the eNB. After the eNB receives the SRS from the UL CC of the SCell and calculates a dynamic TA value, which is a small offset value for detailed adjustment, the eNB transmits the calculated dynamic TA value to the UE through the MAC CE.

The SRS is an embodiment of a reference signal or reference signal. The reference signal serves to provide information on a communication environment, etc. to the counterpart device through uplink or downlink, and the SRS is a channel estimation reference signal indicating the channel state of the UE during uplink transmission. . In addition, the eNB may receive the SRS transmitted from each UE, check the timing at which the SRS is received, track the uplink synchronization, and estimate an error for correcting the uplink.

In addition, as a reference signal, a cell-specific reference signal (CRS) may be transmitted every subframe to identify channel information during downlink transmission. The reference signals may be generated by the UE for the reference signal transmission, that is, the UE in the case of the uplink reference signal, or periodically or aperiodically by the eNB in the case of the downlink reference signal and transmitted to the reference signal receiving apparatus.

In the present specification, when the UE transmits a reference signal to the eNB, such as transmission of the SRS, the eNB may check the state of the network using the received reference signal, and as described above, an offset value required to calculate a TA value. Can be calculated.

Hereinafter, in the present specification, an offset, which is information required for the UE to calculate a TA value of the SCell based on the TA value of the PCell, is defined as offset_pcell, and the offset_pcell is divided into two types as follows.

a) when offset_pcell does not include the difference between the TA values of the PCell and the SCell (T3 in FIG. 4) (in this case, the UE may calculate the T3 value)

b) offset_pcell includes a value added to the TA value of the PCell (in this case, the UE may calculate T2 by adding offset_pcell to T1 without calculating T3 value).

In the case of b), offset_pcell may be calculated through the following two values.

b-i) If the semi-static offset value is set in the UL configuration information of the SCell, the semi-static offset is called offset_pcell_semi.

b-ii) After configuring the SCell, when the eNB configures a dynamic TA value for detailed adjustment, the dynamic TA value is referred to as offset_pcell_dynamic.

In case of b), offset_pcell = offset_pcell_semi + offset_pcell_dynamic.

FIG. 5 is a diagram illustrating a process of adjusting a TA of a SCell by a UE according to an embodiment of the present specification.

The UE receives PCell TA information through an RRC connection establishment procedure to secure a TA value (S510). The SCell is configured through an RRC connection reconfiguration procedure (S520). In this process, check whether TA offset value is included in SCell configuration information. The TA offset value included here includes the offset value that the eNB does not need to calculate a separate delay time for the SCell, but the semi-static eNB for a certain period in the information necessary to reconfigure the RRC, as in the previous bi) If included. Therefore, the TA offset value received by the UE may be offset_pcell_semi of b-i).

On the other hand, when the determination result of S525, if the TA offset value is not included, the UE DL DL of the SCell compared to the DL CC reception delay time of the PCell based on the Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS) in the DL CC of the SCell The reception delay time is calculated (S530). It means to calculate the T3 value of FIG. 4 above, and means the embodiment of a).

The offset information for the SCell delay time calculated by the UE using the S530 process or the delay time that does not change for a certain period of time, which is received from the eNB in the S525 process is roughly, that is, TA information having an error within a predetermined range. Therefore, it is necessary to calculate the correct TA value. Accordingly, the UE transmits SRS through the UL CC in the SCell (S540). In this case, the SRS may be a periodic or aperiodic SRS. The eNB receives the SRS transmitted in step S540 to calculate the correct TA value for the corresponding UE, and transmits the TA offset value to the UE. That is, the UE receives the TA offset value through the RRCConnectionReconfiguration message or the MAC CE of the eNB. In this case, the received TA offset may be an error value added to previously received information or may be an absolute numerical value based on the PCell. This may vary depending on the settings of the UE and eNB. The UE transmits the SCell UL by applying the received TA offset value (S550).

6 is a diagram illustrating a process of providing TA information of a SCell of a UE by the eNB according to an embodiment of the present specification.

The eNB calculates the PCell TA value through the RRC connection setup procedure and transmits it to the UE (S610). In addition, the eNB transmits SCell configuration information to the UE through an RRC connection reconfiguration procedure (S620). In this process, a TA offset value may be optionally included in the SCell configuration information and transmitted. Including the TA offset value means that the UE does not calculate a separate delay time for the SCell as in the above bi), and the eNB includes a semi-static offset value in the RRC reconfiguration information for a certain period of time. Include. Accordingly, the TA offset value included in the eNB in the SCell configuration information may be offset_pcell_semi of b-i).

The offset_pcell_semi value is included in the RRC reconfiguration information, or the UE may independently calculate the DL reception delay time of the SCell relative to the DL CC reception delay time of the PCell based on the PSS / SSS in the DL CC of the SCell (S530). It means to calculate the T3 value of FIG. 4 above, and means the embodiment of a). The TA offset value received by the UE directly or through an eNB becomes the TA difference of the SCell based on the PCell. However, for various reasons described above, this value has a certain range of errors. Therefore, in order to remove this error, the eNB receives the SRS from the UE through the SCell (S630). The TA offset value is calculated using the received SRS (S640), and the calculated TA offset value is transmitted to the UE (S650). In this case, the transmitted TA offset may be an error value added to previously transmitted information or may be an absolute numerical value based on the PCell. This may vary depending on the settings of the UE and eNB. The UE transmits the SCell UL by applying the received TA offset value, and the eNB receives the TA adjusted SCell UL (S660).

Hereinafter, a method of providing a step-by-step TA offset according to an embodiment of the present specification will be described. The TA offset may be transmitted and received through RRC or may be transmitted and received using MAC CE.

7 is a diagram of transmission and reception through RRC according to one embodiment of the present specification.

In FIG. 7, the eNB provides the UE with SCell configuration information through the RRC connection reconfiguration procedure. In this process, the SCell configuration information includes a TA offset value. That is, when the eNB configures the UL of the SCell, the offset value is included as a parameter for the SCell and transmitted to the UE through the RRC reconfiguration procedure. The offset value included in the reconstruction procedure can be applied to all of the above cases a), b), (including b-i and b-ii).

The eNB 790 transmits an RRC reconfiguration message called RRCConnectionReconfiguration to the UE 780 (S710), and the UE 780 sends an RRCConnectionReconfigurationComplete, which is a message indicating that the RRC reconfiguration is successful, to the eNB 790 according to the received RRC reconfiguration message. If transmitted (S720), the RRC reconfiguration procedure is completed.

Performing this reconfiguration procedure is intended to modify an RRC connection, for example to create / change / release / resource / modify / release a resource block, perform a handover, or perform a measurement. It is performed to setup / modify / release or to add / modify / release SCell. In this specification, it is applied when adding / modifying / releasing SCell among them.

SCell configuration information is transmitted from the eNB to the UE in S520 of FIG. 5 and S620 of FIG. 6. Therefore, offset information may be included in such SCell configuration information. That is, the SCell configuration information is information provided by the eNB to the UE in the RRC connection reconfiguration procedure and is information related to configuring the SCell.

In a CA environment using multiple cells in an RRCConnectionReconfiguration message, an RRC Information Element (RRC IE) called RRCConnectionReconfiguration-v10xy-IEs is used, as shown in 730. In this case, when adding or changing the SCell, sCellToAddModList-r10 including SCellToAddMod-r10 is used. In SCellToAddMod-r10, a RadioResourceConfigDedicatedSCell-r10 type of radioResourceConfigDedicatedSCell-r10 item including configuration information about a radio resource allocated to a user terminal is used. To have.

The RadioResourceConfigDedicatedSCell-r10 includes information called physicalConfigDedicated necessary for SCell configuration as follows, and consists of a configuration called PhysicalConfigDedicatedSCell-r10 in the form of physicalConfigDedicated.

RadioResourceConfigDedicatedSCell - r10  :: = SEQUENCE  {

physicalConfigDedicated PhysicalConfigDedicatedSCell - r10 OPTIONAL ,

...

}

Looking at the configuration of the PhysicalConfigDedicatedSCell - r10 , DL and UL configuration is performed. Thus, these PhysicalConfigDedicatedSCell - r10 If the above-mentioned TA offset information is included in the item, the eNB may provide the TA offset value to the UE during the addition / change of the SCell.

FIG. 8 is a diagram illustrating an example in which a TA offset value is included in a specific IE included in an RRC connection reconfiguration message so that a TA offset can be transmitted and received through RRC according to an embodiment of the present specification. In the RRC connection reconfiguration procedure according to an embodiment of the present disclosure, when the information of FIG. 8 is included in an RRCConnectionReconfiguration message, the eNB may provide a TA offset value to the UE. That is, as shown in 810, a parameter called TA-offset-r11 in ul-Configuration, which is an item related to uplink configuration, may be configured, but this may be an embodiment of PhysicalConfigDedicated. It can be provided as an argument of. That is, FIG. 8 is merely an example in which TA-offset information is included in an RRCConnectionReconfiguration message, but the present invention is not limited thereto.

When the TA-offset value transmitted / received in the process of FIGS. 7 and 8 is applied only to the above-mentioned bi), and applied to the bi) and b-ii), and after the UE calculates the difference in the TA value between the SCell and the PCell In this case, the same applies to all cases a) of receiving a detailed TA value.

9 illustrates a structure of a MAC for providing offset information using a MAC according to another embodiment of the present specification.

9 shows the configuration of a MAC PDU (Protocol Data Unit). It consists of a MAC header, multiple MAC CEs and MAC SDUs, and padding. The MAC header is also composed of a plurality of subheaders, and the subheaders and L-fields have the same configuration as 920 and 930. 920 shows a case where the L field is 7 bits, and 930 shows a case where the L field is 15 bits. R in 920 and 930 is a reserved bit and is set to zero. F is a field indicating a format, and L indicates a size of a MAC SDU or a multi-length MAC CE corresponding to a subheader. E is an extension field and indicates whether there are more MAC headers.

The LCID is a logical channel ID field and informs channel characteristics of a corresponding MAC SDU or MAC CE. The information indicated by the LCID value is equal to 940. Here, '11101' means a TA command (Timing Advance Command), so it can be used to provide an offset value. That is, the LCID value may be set to 11101, and the offset may be included in the MAC CE.

FIG. 10 is a diagram illustrating a configuration of a MAC CE including information indicating an offset according to an embodiment of the present specification.

은 다양한 크기를 가질 수 있으므로, 하나 또는 둘 이상의 octet으로 구성될 수 있다. As discussed above, MAC CE is an octet configuration. Therefore, it can have a size of 8 bits. However, offset information

Since may have various sizes, it may be composed of one or more octets.

의 값의 범위를 다음과 같이 나눌 수 있다.
First, when one octet (8 bit) is used as in 1030, a total of 256 kinds of information can be represented. therefore,

The range of values can be divided into

i)

ii)

를 산출할 수 있으나, ii)의 범위 내로 적용할 경우에는 128을 빼고 난 값을

로 산출할 수 있다. Therefore, when the value contained in MAC CE is applied within the range of i),

Can be calculated, but if applied within the range of ii), subtract 128.

It can be calculated as

값은 157이 되지만, ii)에 적용할 경우에는

은 157에서 128을 뺀 29가 된다. For example, if MAC CE is set to "1 0 0 1 1 1 0 1" as shown in 1031, converting it to a decimal number results in 157. If this applies to i)

The value is 157, but if you apply to ii)

Is 157 minus 128 minus 128.

의 값의 범위는 다양하게 규정될 수 있으므로, 반드시 0 또는 -128을 최소값으로 하지 않고, 네트워크의 상태 또는 설정에 따라 -100, 20 등 다양한 수를 기준으로

의 범위를 정할 수 있다.remind

The range of values can be defined in various ways, so do not necessarily set 0 or -128 as the minimum value, but based on various numbers such as -100 and 20 depending on the network status or setting

You can set the range of.

의 값으로 할당할 수 있다. 만약 두 개의 octet을 1040과 같이 사용할 경우

의 값으로 15bit을 할당할 수 있으며,

의 값의 범위를 다음과 같이 나눌 수 있다. 이 경우에 15bit는 32768가지의 정보를 나타낼 수 있으마, TA 환경에 따라 아래와 같이 일부 범위의 값을 사용할 수도 있다. 1040에서 R은 리저브된 비트를 의미한다. Also, two or more octets in one

Can be assigned a value of. If you use two octets together with 1040

15bit can be allocated as

The range of values can be divided into In this case, 15bit can represent 32768 kinds of information, but depending on the TA environment, some ranges of values may be used as shown below. R at 1040 denotes a reserved bit.

i)

ii)

의 값은 7645가 되며, ii)에 적용할 경우,

의 값은 -2611가 된다.
For example, as in 1041, MAC CE consists of two octets, "0 0 1 1 1 0 1" and "1 1 0 1 1 1 0 1". ),

The value of is 7645, and when applied to ii),

The value of becomes -2611.

값을 확인하게 되지만, 도 11에서는 MAC CE에 포함된 수를 소정 단위로 증감시키되, 원래 가질 수 있는 범위의 수보다 크게

값을 가질 수 있도록 하는 경우를 보여주고 있다. FIG. 11 is a diagram illustrating a configuration of a MAC CE including information indicating an offset according to another embodiment of the present specification. 10 uses or changes the numbers included in the MAC CE,

Although the value is confirmed, in FIG. 11, the number included in the MAC CE is increased or decreased by a predetermined unit, but is larger than the number of ranges that can be originally obtained.

The following example shows how to have a value.

는

범위의 값을 갖을 수 있다. 그리고 MAC CE에 포함된

는 아래의 수학식에 적용하게 되며,

값을 최종 산출할 수 있다. That is, if 6bit is used as in 1130, the number included in MAC CE

The

It can have a range of values. And included in MAC CE

Is applied to the following equation,

The value can be finalized.

은 14가 되며, 위의 수식에 입력하면 -272의 값을 가지게 된다. Therefore, when it has a value of "0 1 1 1 0" like 1131

Becomes 14, and if you enter it in the above formula, it has a value of -272.

는

범위의 값을 갖을 수 있다. 그리고 MAC CE에 포함된

는 아래의 수학식에 적용하게 되며,

값을 최종 산출할 수 있다. On the other hand, when using 11bit, such as 1140, the number included in MAC CE

The

It can have a range of values. And included in MAC CE

Is applied to the following equation,

The value can be finalized.

은 1885가 되며, 위의 수식에 입력하면 19904의 값을 가지게 된다. Thus, if it has values of "1 1 1 0 1" and "0 1 1 1 0 1", such as 1141,

Becomes 1885, and if you enter it in the above formula, it will have the value of 19904.

The criteria of 31 and 641 may be set in various ways. That is, it may vary depending on the situation of the network.

The MAC CE described in FIGS. 10 and 11 includes a value required to calculate an offset for a TA of a specific SCell. According to one embodiment of the present specification, the MAC CE may transmit a TA offset value for all serving cells in which a UL CC is configured or activated.

FIG. 12 is a diagram of storing information related to a TA offset in a MAC PDU when a currently configured or activated serving cell is CC1, CC2, or CC4 according to an embodiment of the present specification. In FIG. 12, in the header constituting the MAC PDU 1200, 1210 is a subheader indicating that the MAC CE 1215 provides TA offset information for the first CC CC1, and 1220 is a TA header information for the CC2 CC2. A subheader indicating that the MAC CE 1225 is provided, and 1230 is a subheader indicating that the MAC CE 1235 provides TA offset information for the third CC CC4.

Meanwhile, MAC CE1 corresponding to 1210 provides offset information in the 1031 scheme of FIG. 10, MAC CE2 corresponding to 1220 provides offset information in the 1041 scheme of FIG. 10, and MAC CE3 corresponding to 1230 corresponds to FIG. 11. Offset information is provided in a 1141 manner. The UE receiving the MAC PDU may identify TA offset information for CC1, CC2, and CC4 through a subheader and apply it to each CC.

In addition, TA offset information for all CCs may be stored in one MAC CE. In this case, TA offset information for a plurality of CCs may be stored in one MAC CE. For example, in the header of 1270, there is one subheader 1250 in relation to the TA, and the corresponding CE is equal to 1251. There are three octets, each containing TA offset information for CC1, CC2 and CC4.

FIG. 13 is a diagram illustrating offset information including indicator information according to another embodiment of the present specification. FIG.

If an update for a specific SCell is required (for example, if it is determined that uplink synchronization of some of the SCells of a specific UE measured by SRS is out of a threshold), the base station releases and needs the SCell. SCell including the UL UL CC can be reconfigured. In this case, the configuration of the DL CC in the SCell is also performed.

Therefore, in order to provide the above-described TA offset value, indication information about each CC may be included in the MAC CE. Such an indicator may also operate as information indicating activation / deactivation of the CC. For example, when '1' indicates that the TA offset value of the corresponding CC is transmitted, it may be implemented as 1310 of FIG. 13. C0 is CC1, C1 is CC2, ..., and C7 is an indicator indicating activation / deactivation of CC8.

According to the configuration of 1310, an example of transmitting TA offset values of CC1, CC2, and CC4 is shown in 1320. 1320 is a case where TA offset information is set to a size of 6 bits.

C0, C1, C3 indicating CC1, CC2, CC4 are set to 1, and other C2, C4 to C7 are set to 0. The TA offset values for CC1, CC2, and CC4 become "1 0 0 1 0 0", "0 1 0 1 1 1", and "0 1 0 1 1 1" in this order. Using the configuration of FIG. 13, a TA offset value may be set for a corresponding SCell requiring an update for a specific SCell.

14 is a diagram illustrating a configuration of a UE according to an embodiment of the present specification. The configuration includes a receiver 1410, a transmitter 1420, and a timing controller 1430.

Referring to the overall configuration, the apparatus of FIG. 14 may receive offset information necessary to adjust uplink timing synchronization in a wireless communication system composed of one or more component carriers. Of course, the apparatus of FIG. 14 may provide other functions of the UE, but a description thereof will be omitted. The receiver 1410 receives timing correction information of the first cell from the base station, and the timing controller 1430 calculates timing correction information of the second cell based on the received timing correction information of the first cell. The timing correction information of the second cell means that the second cell is based on the first cell, such as T2 and T3 of FIG. 2. As described above with reference to FIGS. 7 and 8, the timing correction information of the second cell may include timing correction information of the second cell in an RRC reconfiguration message for the second cell. In this case, the timing controller 1430 may extract and use timing correction information of the second cell from the RRC reconfiguration message. On the other hand, the UE can directly compare the downlink delay time between cells. For example, the timing controller 1430 calculates a downlink delay time of the second cell in comparison with the first cell, and combines the calculated delay time and timing correction information of the first cell. Timing correction information of two cells can be calculated.

As described above, the timing correction information of the second cell may include: i) a propagation delay difference due to a difference between frequency bands of the DL CC and the UL CC, or ii) a transmission time T_Send time of each of the DL CCs is different from each other, or iii) There may be a case in which the primary uplink receiving apparatus is changed, and there may be an error with the correct uplink timing correction information of the second cell.

Accordingly, the transmitter 1420 transmits a reference signal through the second cell using the calculated timing correction information of the second cell. The reference signal may be the SRS described above, and may be transmitted periodically or aperiodically. Thereafter, when the receiver 1410 receives offset information necessary to adjust the error of the timing correction information of the second cell from the base station, the timing controller 1430 uses the received offset information to receive the second information. The uplink timing correction information of the cell is set. The UE may perform uplink timing synchronization using the uplink timing correction information of the second cell.

The uplink timing correction information of the second cell is information which enables accurate uplink timing correction by applying the offset. As described above with reference to FIGS. 9 to 13, the offset may include the offset information in the MAC CE of the MAC PDU.

As shown in FIG. 12, the second cell may include two or more cells, and the offset information may sequentially include an error of timing correction information for the two or more cells.

As shown in FIG. 13, the second cell includes two or more cells, and the offset information indicates an error between indicator information indicating an activated or configured cell among the two or more cells and timing correction information for the two or more cells. It may include.

One embodiment of the first cell of Figure 14 is a PCell, the second cell is an SCell. 12 and 13, one or more SCells may exist.

FIG. 15 is a diagram illustrating a configuration of an eNB according to an embodiment of the present specification. FIG. The configuration includes a receiver 1510, a transmitter 1520, and a timing correction information generator 1530. Looking at the overall configuration, the apparatus of FIG. 15 may transmit offset information necessary to adjust uplink timing synchronization in a wireless communication system composed of one or more component carriers. Of course, the apparatus of FIG. 15 may provide other functions of the eNB, but a description thereof will be omitted.

The transmitter 1520 transmits timing correction information of the first cell to the user terminal, and the receiver 1510 receives a reference signal transmitted by the user terminal based on the timing correction information of the second cell calculated by the user terminal. Done.

The timing correction information of the second cell means that the second cell is based on the first cell, such as T2 and T3 of FIG. 2. As described above with reference to FIGS. 7 and 8, the timing correction information of the second cell may include timing correction information of the second cell in an RRC reconfiguration message for the second cell. In this case, the user terminal may include the timing correction information of the second cell in the RRC reconfiguration message for generating the second cell and transmit the same. On the other hand, the UE can directly compare the downlink delay time between cells. For example, a delay time may be compared in a process of receiving a downlink frame transmitted through a first cell and a second cell by the UE. That is, the timing controller 1430 of the UE of FIG. 14 calculates the downlink delay time of the second cell compared with the first cell, and combines the calculated delay time and timing correction information of the first cell. The timing correction information of the second cell may be calculated. In this case, the eNB does not need to separately transmit timing correction information of the second cell.

As described above, the timing correction information of the second cell may include: i) a propagation delay difference due to a difference between frequency bands of the DL CC and the UL CC, or ii) a transmission time T_Send time of each of the DL CCs is different from each other, or iii) There may be a case in which the primary uplink receiving apparatus is changed, and there may be an error with the correct uplink timing correction information of the second cell. The reference signal may be the SRS described above and may be received periodically or aperiodically.

The timing correction information generator 1530 calculates offset information necessary for setting uplink timing correction information of the second cell by using the received reference signal, and the transmitter 1520 transmits to the user terminal. The offset information is transmitted. The uplink timing correction information of the second cell may be set using the offset information and the timing correction information of the second cell, and the UE synchronizes uplink timing using the uplink timing correction information of the second cell. Can be performed.

The uplink timing correction information of the second cell is information which enables accurate uplink timing correction by applying the offset. As described above with reference to FIGS. 9 to 13, the offset unit 1520 may transmit a MAC PDU including MAC CE including offset information to the UE.

As shown in FIG. 12, the second cell may include two or more cells, and the offset information may sequentially include an error of timing correction information for the two or more cells.

As shown in FIG. 13, the second cell includes two or more cells, and the offset information indicates an error between indicator information indicating an activated or configured cell among the two or more cells and timing correction information for the two or more cells. It may include.

One embodiment of the first cell of Figure 15 is a PCell, the second cell is an SCell. 12 and 13, one or more SCells may exist.

In the present specification, when the physical medium characteristics of the component carriers are different, for example, the positions of the center frequencies between the component carriers are greatly spaced apart, or devices in the network supporting the component carriers are not the same. Since the values of TA may be different from each other, for this purpose, accurate uplink synchronization for each component carrier can be obtained. In particular, only some component carriers having acquired uplink synchronization may perform stable and efficient uplink communication.

Claims (24)

In order to receive the offset information required to adjust the uplink timing synchronization in a wireless communication system consisting of one or more component carriers,
Receiving timing correction information of the first cell from the base station;
Calculating timing correction information of a second cell based on the received timing correction information of the first cell;
Transmitting a reference signal using the calculated timing correction information of the second cell;
Receiving offset information necessary for adjusting an error of timing correction information of the second cell from the base station; And
Setting uplink timing correction information of the second cell using the received offset information and timing correction information of the second cell,
And wherein the first cell is a main serving cell performing a random access procedure.
The method of claim 1,
Calculating timing correction information of the second cell
Extracting timing correction information of the second cell included in the RRC reconfiguration message for the second cell.
The method of claim 1,
Calculating timing correction information of the second cell
Calculating a downlink delay time of the second cell compared to the first cell; And
Combining the calculated delay time and timing correction information of the first cell to calculate timing correction information of the second cell.
The method of claim 1,
The offset information is included in the MAC CE of the MAC PDU, method for receiving uplink synchronization information.
The method of claim 4, wherein
The second cell comprises two or more cells,
And the offset information sequentially includes an error of timing correction information for the two or more cells.
The method of claim 4, wherein
The second cell comprises two or more cells,
And the offset information includes an error of indicator information indicating an activated or configured cell of the two or more cells and timing correction information for the two or more cells.
In order to transmit the offset information required to adjust the uplink timing synchronization in a wireless communication system consisting of one or more component carriers,
Transmitting timing correction information of a first cell to a user terminal;
Receiving a reference signal transmitted by the user terminal based on timing correction information of a second cell calculated by the user terminal; And
Calculating offset information necessary for setting uplink timing correction information of the second cell by using the received reference signal and transmitting the offset information to the user terminal, wherein the uplink timing correction information of the second cell is determined by the method. The first cell is set using offset information and timing correction information of the second cell, and the first cell is a main serving cell for performing a random access procedure.
8. The method of claim 7,
After transmitting the timing correction information of the first cell to a user terminal,
Transmitting to the user terminal an RRC reconfiguration message for the second cell that includes timing correction information of the second cell.
8. The method of claim 7,
The timing correction information of the second cell calculated by the user terminal is
The user terminal calculates a downlink delay time of the second cell based on the first cell, and combines the calculated delay time and timing correction information of the first cell; How to send sync information.
8. The method of claim 7,
Transmitting the offset information to the user terminal by including the offset information in a MAC CE of a MAC PDU.
The method of claim 10,
The second cell comprises two or more cells,
And the offset information sequentially includes an error of timing correction information for the two or more cells.
The method of claim 10,
The second cell comprises two or more cells,
And the offset information includes an error of indicator information indicating an activated or configured cell of the two or more cells and timing correction information for the two or more cells.
An apparatus for receiving offset information required to adjust uplink timing synchronization in a wireless communication system consisting of one or more component carriers,
A receiver which receives timing correction information of a first cell from a base station;
A timing controller configured to calculate timing correction information of a second cell based on the received timing correction information of the first cell; And
A transmitter which transmits a reference signal through the second cell by using the calculated timing correction information of the second cell,
When the receiver receives offset information necessary for adjusting the error of the timing correction information of the second cell from the base station, the timing controller uses the received offset information to obtain uplink timing correction information of the second cell. And setting up the first cell, wherein the first cell is a main serving cell performing a random access procedure.
The method of claim 13,
And the timing controller extracts timing correction information of the second cell from the RRC reconfiguration message for the second cell.
The method of claim 13,
The timing control unit
The downlink delay time of the second cell is calculated in comparison with the first cell, and the timing correction information of the second cell is calculated by combining the calculated delay time and timing correction information of the first cell. A device for receiving uplink synchronization information.
The method of claim 13,
And the offset information is included in a MAC CE of a MAC PDU.
17. The method of claim 16,
The second cell comprises two or more cells,
And the offset information sequentially includes an error of timing correction information for the two or more cells.
17. The method of claim 16,
The second cell comprises two or more cells,
And the offset information includes an error of indicator information indicating an activated or configured cell of the two or more cells and timing correction information for the two or more cells.
An apparatus for transmitting offset information necessary for adjusting uplink timing synchronization in a wireless communication system composed of one or more component carriers,
A transmitter for transmitting timing correction information of the first cell to a user terminal;
A receiver configured to receive a reference signal transmitted by the user terminal based on timing correction information of the second cell calculated by the user terminal; And
A timing correction information generator configured to calculate offset information required to set uplink timing correction information of the second cell by using the received reference signal;
The transmitter transmits the offset information to the user terminal, the uplink timing correction information of the second cell is set using the offset information and the timing correction information of the second cell, and the first cell has random access. Apparatus for transmitting uplink synchronization information, characterized in that the primary serving cell performing the procedure.
20. The method of claim 19,
After the transmitter transmits the timing correction information of the first cell to the user terminal, the RRC reconfiguration message for the second cell including the timing correction information of the second cell is transmitted to the user terminal. And uplink synchronization information.
20. The method of claim 19,
The timing correction information of the second cell calculated by the user terminal is
The user terminal calculates a downlink delay time of the second cell based on the first cell, and combines the calculated delay time and timing correction information of the first cell; Device for transmitting synchronization information.
20. The method of claim 19,
And the transmitter transmits the offset information to the user terminal by including the offset information in a MAC CE of a MAC PDU.
23. The method of claim 22,
The second cell comprises two or more cells,
And the offset information sequentially includes an error of timing correction information for the two or more cells.
23. The method of claim 22,
The second cell comprises two or more cells,
And the offset information includes an error of indicator information indicating an activated or configured cell of the two or more cells and timing correction information for the two or more cells.

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