CN116546614B - Timing synchronization method and device for secondary cells under carrier aggregation - Google Patents

Timing synchronization method and device for secondary cells under carrier aggregation Download PDF

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CN116546614B
CN116546614B CN202310825618.0A CN202310825618A CN116546614B CN 116546614 B CN116546614 B CN 116546614B CN 202310825618 A CN202310825618 A CN 202310825618A CN 116546614 B CN116546614 B CN 116546614B
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random access
cell
auxiliary cell
auxiliary
base station
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CN116546614A (en
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吕圣洁
李强
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ASR Microelectronics Co Ltd
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ASR Microelectronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method and a device for timing synchronization of a secondary cell under carrier aggregation. The UE is connected with the main cell, and the base station of the main cell sends a secondary cell adding reconfiguration message containing the random access information of the secondary cell to the UE. After receiving the request, the UE initiates a random access process on the auxiliary cell needing to be added. The auxiliary cell base station obtains the current TA value of the UE through the detection of the last random access process; the secondary cell base station sends a random access response containing the current TA value of the UE to the UE. After receiving the information, the UE correspondingly adjusts the timing deviation of the corresponding auxiliary cell; and then the UE sends a secondary cell adding reconfiguration complete message to the base station of the primary cell. The primary cell base station activates the secondary cell. The invention adds at least one part of random access flow in the process of adding the auxiliary cells in carrier aggregation to obtain the timing deviation of the UE, so that the auxiliary cells in the carrier aggregation cells realize accurate timing synchronization.

Description

Timing synchronization method and device for secondary cells under carrier aggregation
Technical Field
The present invention relates to a mobile communication technology, and in particular, to cell synchronization in carrier aggregation mode in a mobile communication network with 4G, 5G and subsequent evolution.
Background
Carrier aggregation (Carrier Aggregation, CA) techniques assign multiple carrier units (component carriers) to the same user to increase the transmission speed of a single user. The 4G LTE later evolution and the 5G NR all adopt a carrier aggregation mode to obtain higher data throughput rate. The late LTE communication protocol version supports unsynchronized cell carrier aggregation. For a carrier aggregation cell, the NR communication protocol supports a TA (timing advance) value larger than that of the LTE communication protocol, and the maximum TA value supported by the LTE is 667 mu s; the maximum TA value supported by NR can be up to 2ms and the accuracy requirement is higher than that of LTE.
According to the protocol requirements, the transmission TA value deviation of 34.6 μs is maximally supported between NR carrier aggregation cells for FR1 (Frequency Range 1). For NR carrier aggregation cells, all Primary cells (PCell) are of the same genus pTAG (Primary Timing Advance Group ) and all Secondary cells (SCell) are of the same genus scag (Secondary Timing Advance Group ).
When there is a TA value deviation of 34.6 μs between carrier aggregation cells, after the secondary cell is activated, there is a possibility that the transmission performance of some secondary cells may be deteriorated due to the existence of a relatively large TA value itself, thereby affecting the aggregation throughput. Even the activation of a certain secondary cell may be affected if the channel environment is not good. Timing tracking of the secondary cells directly affects the effect of carrier aggregation, both from a performance or functional perspective. Timing tracking refers to the process by which a UE (user equipment, i.e., mobile terminal) adjusts its TA value in order to keep the transmission and reception synchronized with the network in time. Timing tracking may be understood as the synchronization of cells with a UE, also referred to as timing synchronization. For cells of carrier aggregation networking, if accurate synchronization between each cell and UE is achieved by the network alone in the existing scheme, timing control of different networks may cause jitter in certain scenarios, so that it is necessary to introduce a new synchronization scheme.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to achieve accurate timing synchronization for the secondary cells in the carrier aggregation cell.
In order to solve the technical problems, the invention provides a method for timing synchronization of a secondary cell under carrier aggregation, which comprises the following steps. Step S21: the UE is connected with the main cell, and the base station of the main cell sends a piece of auxiliary cell adding reconfiguration message to the UE and informs the UE of auxiliary cell information to be added; the auxiliary cell adding reconfiguration message also contains random access information of the auxiliary cell. Step S22: after receiving the auxiliary cell adding reconfiguration message containing the random access information of the auxiliary cell, the UE initiates a random access process on the auxiliary cell needing to be added. Step S23: the auxiliary cell base station obtains the current TA value of the UE through the detection of the last random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response contains the current TA value of the UE. Step S24: after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation of the corresponding auxiliary cell; and then the UE sends a secondary cell adding reconfiguration completion message to the primary cell base station, and informs the network side that the secondary cell is received and added. Step S25: the primary cell base station activates the secondary cell.
Preferably, during the secondary cell addition and synchronization from step S21 to step S24, the network side does not allocate other scheduling tasks to the UE.
Optionally, as a second embodiment, the following steps are further included after the step S25. Step S31: the method comprises the steps that under the activation connection state of a carrier aggregation auxiliary cell, an auxiliary cell base station sends a Physical Downlink Control Channel (PDCCH) instruction of the auxiliary cell to the UE; or, the PDCCH instruction of the secondary cell is changed into a synchronization instruction of the secondary cell, and the synchronization instruction is used for indicating the UE to actively initiate a random access. Step S32: after receiving the PDCCH instruction of the auxiliary cell or the synchronization instruction of the auxiliary cell, the UE actively initiates a random access process to the auxiliary cell. Step S33: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
Optionally, as a third embodiment, the following steps are further included after the step S25. Step S41: and the UE actively transmits timing synchronization request information to the auxiliary cell base station in the carrier aggregation auxiliary cell activation connection state, wherein the timing synchronization request information is used for requesting a network side to transmit a Physical Downlink Control Channel (PDCCH) instruction. Step S42: and after receiving the timing synchronization request information, the auxiliary cell base station sends a PDCCH instruction of the auxiliary cell to the UE. Step S43: after receiving the PDCCH instruction of the auxiliary cell, the UE actively initiates a random access process to the auxiliary cell. Step S44: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
Optionally, as a fourth embodiment, the following steps are further included after the step S25. Step S51: and the UE actively initiates a random access process to the auxiliary cell by using Random Access Channel (RACH) information in an auxiliary cell adding reconfiguration message when the auxiliary cell is added in a carrier aggregation auxiliary cell activation connection state. Step S52: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
Preferably, the initiated random access is an initiated non-contention random access.
The invention also provides a device for timing synchronization of the auxiliary cells under carrier aggregation, which comprises an auxiliary cell addition notification unit, a random access initiating unit, a random access response unit, a timing deviation adjusting unit and an auxiliary cell activating unit. The auxiliary cell adding notification unit is used for sending an auxiliary cell adding reconfiguration message from the base station of the main cell to the UE when the UE is kept connected with the main cell, and notifying the UE of auxiliary cell information to be added; the auxiliary cell adding reconfiguration message also contains random access information of the auxiliary cell. The random access initiating unit is used for initiating a random access process on the auxiliary cell needing to be added after the UE receives the auxiliary cell adding reconfiguration message containing the random access information of the auxiliary cell. The random access response unit is used for obtaining the current TA value of the UE through the detection of the latest random access process by the auxiliary cell base station, and the auxiliary cell base station sends a random access response to the UE, wherein the current TA value of the UE is contained. The timing deviation adjusting unit is used for adjusting the timing deviation of the corresponding auxiliary cell correspondingly after the UE receives the random access response containing the current TA value. The secondary cell activation unit is configured to activate the secondary cell by the primary cell base station.
Optionally, as a second embodiment, the apparatus for timing synchronization of a secondary cell under carrier aggregation further includes a network side synchronization sending unit. The network side synchronous sending unit is used for sending a PDCCH instruction of the auxiliary cell to the UE by the auxiliary cell base station under the condition that the UE activates the connection state for the auxiliary cell of carrier aggregation; or, the PDCCH instruction of the auxiliary cell is changed into the synchronous instruction of the auxiliary cell, and the synchronous instruction is used for indicating the UE to actively initiate the random access once. The random access initiating unit is further configured to actively initiate a random access procedure to the secondary cell after the UE receives the PDCCH instruction of the secondary cell or the synchronization instruction of the secondary cell.
Optionally, as an embodiment three, the apparatus for timing synchronization of a secondary cell under carrier aggregation further includes an active synchronization sending unit and an active synchronization response unit. The active synchronization sending unit is used for actively sending timing synchronization request information to the auxiliary cell base station by the UE in a state that the UE activates the connection for the auxiliary cell with carrier aggregation, and the information is used for requesting the network side to send a PDCCH instruction. The active synchronization response unit is used for sending the PDCCH instruction of the auxiliary cell to the UE after the auxiliary cell base station receives the timing synchronization request information. The random access initiating unit is further configured to actively initiate a random access procedure to the secondary cell after the UE receives a PDCCH instruction of the secondary cell or a synchronization instruction of the secondary cell.
Optionally, as an embodiment four, in the device for timing synchronization of the secondary cell under carrier aggregation, the random access initiating unit is further configured to, when the UE activates a connection state for the secondary cell of carrier aggregation, actively initiate a random access procedure to the secondary cell by using RACH information of a random access channel in a secondary cell addition reconfiguration message when the secondary cell is added.
The invention has the technical effects that: adding a random access flow in the process of adding the auxiliary cells in the carrier aggregation, and obtaining the timing deviation of the UE through MSG1 and MSG2 in the random access flow so as to realize accurate timing synchronization of the auxiliary cells in the carrier aggregation cells.
Drawings
Fig. 1 is a flow chart of a method for adding a secondary cell by a UE in a conventional carrier aggregation process.
Fig. 2 is a flowchart of an embodiment one of a method for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 3 is an additional flow chart of a second embodiment of a method for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 4 is an additional flowchart of a third embodiment of a method for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 5 is an additional flowchart of a method for timing synchronization of a secondary cell under carrier aggregation according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an embodiment one of an apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 7 is a schematic structural diagram of a second embodiment of an apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 8 is a schematic structural diagram of a third embodiment of an apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
Fig. 9 is a schematic structural diagram of an embodiment four of an apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention.
The reference numerals in the drawings illustrate: the method comprises the steps of 1, a secondary cell adding notification unit, 2, a random access initiating unit, 3, a random access response unit, 4, a timing deviation adjusting unit, 5, a secondary cell activating unit, 6, a network side synchronous sending unit, 7, and 8, wherein the secondary cell adding notification unit, the random access initiating unit, the random access response unit, the timing deviation adjusting unit, the secondary cell activating unit, the network side synchronous sending unit, the active synchronous sending unit and the active synchronous response unit are adopted.
Detailed Description
Referring to fig. 1, the method for adding a secondary cell to a UE in the existing carrier aggregation process includes the following steps.
Step S11: the UE is connected with the main cell, and the main cell base station of the network side sends a message of adding reconfiguration (Scell add reconfiguration) of the auxiliary cell to the UE, and informs the UE of the auxiliary cell information to be added.
Step S12: after receiving the reconfiguration message for adding the secondary cell, the UE adds the secondary cell, and then sends a reconfiguration complete (Scell add reconfiguration complete) message for adding the secondary cell to the primary cell base station, and informs the network side that the secondary cell has been received and added.
Step S13: the primary cell base station activates the secondary cell.
This is without secondary cell timing synchronization in between. The timing synchronization and the timing tracking have basically the same meaning, that is, the UE adjusts the TA value to achieve the purpose of keeping synchronization with the network.
Referring to fig. 2, an embodiment of a method for timing synchronization of a secondary cell under carrier aggregation according to the present invention includes the following steps.
Step S21: the UE is connected with the main cell, and the main cell base station of the network side sends a piece of auxiliary cell adding reconfiguration information to the UE and informs the UE of auxiliary cell information to be added. The secondary cell addition reconfiguration message also contains random access (random access) information of the secondary cell, namely PRACH (Physical Random Access Channel ) information special for the secondary cell.
Step S22: after receiving the auxiliary cell adding reconfiguration message containing the random access information of the auxiliary cell, the UE initiates a random access process on the auxiliary cell needing to be added, namely, the UE sends MSG1 to the auxiliary cell base station. The initiated random access is preferably a non-contention random access (contention free random access).
Step S23: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process. The secondary cell base station sends MSG2 (i.e., RAR, random access reponse, random access response) to the UE, which contains the current TA value of the UE. If a non-contention random access procedure is used, receipt of MSG2 indicates that the non-contention random access procedure is over. If a competing random access procedure is used, the remaining random access procedures MSG3 and MSG4 may be performed, which is not contributing to the present invention.
Step S24: after receiving MSG2 containing current TA value, UE adjusts timing deviation corresponding to secondary cell correspondingly. Specifically, the UE obtains a TA value that the network indicates to the UE to adjust according to the tacmd field carried in the MSG2, and the UE compensates the TA value to ensure that the subsequent transmission to the secondary cell meets the network synchronization requirement. And then the UE sends a secondary cell adding reconfiguration completion message to the primary cell base station, and informs the network side that the secondary cell is received and added.
Step S25: the primary cell base station activates the secondary cell.
In the secondary cell adding and synchronizing process from the step S21 to the step S24, the network side does not allocate other scheduling tasks to the UE. Therefore, the success rate of adding the auxiliary cells is higher, and the timing tracking of the subsequent uplink transmission is more accurate.
The first embodiment performs timing synchronization during the process of adding the secondary cell in carrier aggregation, and mainly obtains uplink timing synchronization of the secondary cell through the process of adding random access during the process of adding the secondary cell. Non-contention random access is preferred for the purpose of reducing signaling overhead. Because only one auxiliary cell is added in the random access process, the accessed UE and the network are determined, so that the non-competitive access can meet the requirement. Instead, competitive random access is also possible if the signaling overhead is not a concern.
In the first embodiment, the uplink timing synchronization of a certain secondary cell is obtained through a process of adding random access in the adding process of the secondary cell. Since all the auxiliary cells belong to one sTAG, it is clear that the auxiliary cells which can be in the sTAG during carrier aggregation networking need to be ensured to be in timing synchronization with each other; so that TA value adjustment can be performed for all secondary cells when TA value is obtained only when one secondary cell is added.
Referring to fig. 3, in a second embodiment of the method for timing synchronization of a secondary cell under carrier aggregation according to the present invention, the following steps are further included after step S25 of the first embodiment.
Step S31: and the UE sends a PDCCH (Physical Downlink Control Channel ) instruction of the auxiliary cell to the UE by the auxiliary cell base station of the network side in the carrier aggregation auxiliary cell activation connection state. The PDCCH instruction is originally used for synchronizing with the UE again at the network side when the uplink of the main cell is out of step under single cell or carrier aggregation. The invention here uses PDCCH instructions for different purposes, namely for timing synchronization of the secondary cells.
Or, this step changes the PDCCH order of the secondary cell into the synchronization order of the secondary cell, and the synchronization order is used to instruct the UE to actively initiate a random access.
Step S32: after receiving a PDCCH instruction of a secondary cell (or a synchronization instruction of the secondary cell), the UE actively initiates a Random Access (RA) process to the secondary cell, namely, the UE sends MSG1 to a base station of the secondary cell. The initiated random access is preferably a non-contention random access.
Step S33: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process. The secondary cell base station sends MSG2 to the UE, wherein the MSG2 contains the current TA value of the UE. After receiving MSG2 containing current TA value, UE adjusts timing deviation from secondary cell correspondingly so as to reach purpose of synchronizing with timing of secondary cell.
The above embodiment includes two processes of adjusting the TA value, which are respectively performed when the secondary cell is added (step S24) and when the secondary cell is in an active connection state (step S33), so that the TA value of the secondary cell in the carrier aggregation cell can be more accurately synchronized. The steps S31-S33 are especially suitable for the situation that the network side detects that a certain auxiliary cell is bad in receiving quality, and the auxiliary cell base station actively initiates a PDCCH instruction to the UE for synchronization.
Referring to fig. 4, in a third embodiment of the method for timing synchronization of a secondary cell under carrier aggregation according to the present invention, the following steps are further included after step S25 of the first embodiment.
Step S41: and the UE actively sends timing synchronization request (timing synchronization request) information to the secondary cell base station in the carrier aggregation secondary cell activation connection state, wherein the information is used for requesting a network side to send a PDCCH instruction.
Step S42: and after receiving the timing synchronization request information, the auxiliary cell base station sends a PDCCH instruction of the auxiliary cell to the UE.
Step S43: after receiving the PDCCH instruction of the auxiliary cell, the UE actively initiates a random access process to the auxiliary cell, namely, the UE sends MSG1 to the auxiliary cell base station. The initiated random access is preferably a non-contention random access.
Step S44: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process. The secondary cell base station sends MSG2 to the UE, wherein the MSG2 contains the current TA value of the UE. After receiving MSG2 containing current TA value, UE adjusts timing deviation from secondary cell correspondingly so as to reach purpose of synchronizing with timing of secondary cell.
The third embodiment also includes two processes of adjusting the TA value, which are respectively performed when the secondary cell is added (step S24) and when the secondary cell is in an active connection state (step S44), so that the TA value of the secondary cell in the carrier aggregation cell can be more accurately synchronized. The steps S41-S44 are particularly suitable for the UE to actively send timing synchronization request information to a certain secondary cell when the reception quality or the transmission quality of the communication between the UE and the secondary cell does not meet the threshold requirement, so as to require the secondary cell to initiate a PDCCH instruction to the UE for synchronization.
Referring to fig. 5, in a fourth embodiment of the method for timing synchronization of a secondary cell under carrier aggregation according to the present invention, the following steps are further included after step S25 of the first embodiment.
Step S51: in the carrier aggregation secondary cell activation connection state, the UE actively initiates a random access process to the secondary cell by using RACH (Random Access Channel ) information in a secondary cell addition reconfiguration message when the secondary cell is added, namely, the UE sends MSG1 to a secondary cell base station. The initiated random access is preferably a non-contention random access.
Step S52: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process. The secondary cell base station sends MSG2 to the UE, wherein the MSG2 contains the current TA value of the UE. After receiving MSG2 containing current TA value, UE adjusts timing deviation from secondary cell correspondingly so as to reach purpose of synchronizing with timing of secondary cell.
The fourth embodiment also includes two processes of adjusting the TA value, which are respectively performed when the secondary cell is added (step S24) and when the secondary cell is in an active connection state (step S52), so that the TA value of the secondary cell in the carrier aggregation cell can be more accurately synchronized. In particular, when the UE detects that the transmission quality of a certain secondary cell is particularly poor, in step S41 of the third embodiment, if the UE actively sends out the timing synchronization request information, the receiving of the secondary cell base station is difficult, so that the scheme of the fourth embodiment can only be adopted.
Referring to fig. 6, an embodiment of an apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention includes a secondary cell addition notification unit 1, a random access initiation unit 2, a random access response unit 3, a timing deviation adjustment unit 4, and a secondary cell activation unit 5. The apparatus shown in fig. 6 corresponds to the method shown in fig. 2.
The secondary cell adding notification unit 1 is configured to send a secondary cell adding reconfiguration message from the primary cell base station to the UE when the UE remains connected to the primary cell, and notify the UE of secondary cell information to be added. The auxiliary cell adding reconfiguration message also contains random access information of the auxiliary cell.
The random access initiating unit 2 is configured to initiate a random access procedure on a secondary cell to be added after the UE receives a secondary cell adding reconfiguration message containing random access information of the secondary cell.
The random access response unit 3 is configured to obtain, by the secondary cell base station, a current TA value of the UE through detection of a last random access procedure, where the secondary cell base station sends a random access response to the UE, and the random access response includes the current TA value of the UE.
The timing deviation adjusting unit 4 is configured to adjust the timing deviation of the corresponding secondary cell correspondingly after the UE receives the random access response including the current TA value.
The secondary cell activation unit 5 is used for activating the secondary cell by the primary cell base station.
Referring to fig. 7, in a second embodiment of the apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention, a network side synchronization sending unit 6 is added on the basis of the first embodiment. The apparatus shown in fig. 7 corresponds to the method shown in fig. 3.
The network side synchronization sending unit 6 is configured to send a PDCCH instruction of the secondary cell to the UE by the secondary cell base station in a state that the UE activates a connection state for the secondary cell of carrier aggregation. Or, the PDCCH instruction of the auxiliary cell is changed into the synchronous instruction of the auxiliary cell, and the synchronous instruction is used for indicating the UE to actively initiate the random access once.
The random access initiating unit 2 is further configured to actively initiate a random access procedure to the secondary cell after the UE receives a PDCCH instruction of the secondary cell or a synchronization instruction of the secondary cell.
Referring to fig. 8, in a third embodiment of the apparatus for timing synchronization of a secondary cell under carrier aggregation according to the present invention, an active synchronization sending unit 7 and an active synchronization responding unit 8 are added on the basis of the first embodiment. The apparatus shown in fig. 8 corresponds to the method shown in fig. 4.
The active synchronization sending unit 7 is configured to, when the UE activates a connection state for a secondary cell of carrier aggregation, send timing synchronization request information to the secondary cell base station by the UE, where the information is used to request the network side to send a PDCCH instruction.
The active synchronization response unit 8 is configured to send a PDCCH order of the secondary cell to the UE after the secondary cell base station receives the timing synchronization request information.
The random access initiating unit 2 is further configured to actively initiate a random access procedure to the secondary cell after the UE receives a PDCCH instruction of the secondary cell or a synchronization instruction of the secondary cell.
Referring to fig. 9, in a fourth embodiment of a method for timing synchronization of a secondary cell under carrier aggregation according to the present invention, content is added on the basis of the first embodiment. The random access initiating unit 2 is further configured to, in a state that the UE activates a connection state for a secondary cell of carrier aggregation, actively initiate a random access procedure to the secondary cell by using RACH information in a secondary cell addition reconfiguration message when the secondary cell is added.
In order to enable the secondary cells to have better performance and throughput rate after being activated under carrier aggregation, the timing tracking (timing synchronization) of each activated cell is required to be accurate. The method and the device improve the timing tracking accuracy of the carrier aggregation auxiliary cell in two modes. Firstly, in the process of adding the auxiliary cells by carrier aggregation, the accurate timing tracking of each auxiliary cell is obtained by adding a random access procedure of the auxiliary cell (embodiment I). And secondly, in the service making process after carrier aggregation activation (namely in a connection state), the uplink timing tracking of the secondary cell is synchronized again through a random access flow (the second embodiment, the third embodiment and the fourth embodiment).
The invention can well ensure the timing synchronization of the UE and each carrier aggregation cell under carrier aggregation, so as to improve the adding and activating success rate of the auxiliary cells under carrier aggregation, and can improve the throughput rate of the UE under carrier aggregation with better performance. So that the carrier aggregation resource is more effectively utilized.
The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for timing synchronization of a secondary cell under carrier aggregation is characterized by comprising the following steps of;
step S21: the UE is connected with the main cell, and the base station of the main cell sends a piece of auxiliary cell adding reconfiguration message to the UE and informs the UE of auxiliary cell information to be added; the auxiliary cell adding reconfiguration message also contains random access information of the auxiliary cell;
step S22: after receiving the auxiliary cell adding reconfiguration message containing the random access information of the auxiliary cell, the UE initiates a random access process on the auxiliary cell needing to be added;
step S23: the auxiliary cell base station obtains the current timing advance TA value of the UE through the detection of the last random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE;
step S24: after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation of the corresponding auxiliary cell; then the UE sends a secondary cell adding reconfiguration completion message to the primary cell base station, and informs the network side that the secondary cell is received and added;
step S25: the primary cell base station activates the secondary cell.
2. The method for timing synchronization of secondary cells under carrier aggregation according to claim 1, wherein the network side does not allocate other scheduling tasks to the UE in the secondary cell addition and synchronization process from step S21 to step S24.
3. The method for timing synchronization of secondary cells under carrier aggregation according to claim 1, further comprising the step of, after said step S25;
step S31: the method comprises the steps that under the activation connection state of a carrier aggregation auxiliary cell, an auxiliary cell base station sends a Physical Downlink Control Channel (PDCCH) instruction of the auxiliary cell to the UE; or the PDCCH instruction of the auxiliary cell is changed into a synchronous instruction of the auxiliary cell, and the synchronous instruction is used for indicating the UE to actively initiate a random access;
step S32: after receiving the PDCCH instruction of the auxiliary cell or the synchronization instruction of the auxiliary cell, the UE actively initiates a random access process to the auxiliary cell;
step S33: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
4. The method for timing synchronization of secondary cells under carrier aggregation according to claim 1, further comprising the step of, after said step S25;
step S41: in the activation connection state of the auxiliary cell of carrier aggregation, the UE actively transmits timing synchronization request information to the auxiliary cell base station, wherein the timing synchronization request information is used for requesting a network side to transmit a Physical Downlink Control Channel (PDCCH) instruction;
step S42: after receiving the timing synchronization request information, the auxiliary cell base station sends a PDCCH instruction of the auxiliary cell to the UE;
step S43: after receiving a PDCCH instruction of an auxiliary cell, the UE actively initiates a random access process to the auxiliary cell;
step S44: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
5. The method for timing synchronization of secondary cells under carrier aggregation according to claim 1, further comprising the step of, after said step S25;
step S51: in the activation connection state of the auxiliary cell of the carrier aggregation, the UE actively initiates a random access process to the auxiliary cell by using Random Access Channel (RACH) information in an auxiliary cell addition reconfiguration message when the auxiliary cell is added;
step S52: the auxiliary cell base station obtains the current TA value of the UE through the detection of the random access process; the secondary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE; after receiving the random access response containing the current TA value, the UE correspondingly adjusts the timing deviation with the auxiliary cell.
6. The method of timing synchronization of secondary cells under carrier aggregation according to any one of claims 1, 3, 4, 5, wherein the initiated random access is an initiated non-contention random access.
7. The device for timing synchronization of the auxiliary cells under carrier aggregation is characterized by comprising an auxiliary cell addition notification unit, a random access initiating unit, a random access response unit, a timing deviation adjusting unit and an auxiliary cell activating unit;
the auxiliary cell adding notification unit is used for sending an auxiliary cell adding reconfiguration message from the base station of the main cell to the UE when the UE is kept connected with the main cell, and notifying the UE of auxiliary cell information to be added; the auxiliary cell adding reconfiguration message also contains random access information of the auxiliary cell;
the random access initiating unit is used for initiating a random access process on a secondary cell needing to be added after the UE receives the secondary cell adding reconfiguration message containing the random access information of the secondary cell;
the random access response unit is used for obtaining the current TA value of the UE through the detection of the latest random access process by the auxiliary cell base station, and the auxiliary cell base station sends a random access response to the UE, wherein the random access response comprises the current TA value of the UE;
the timing deviation adjusting unit is used for correspondingly adjusting the timing deviation of the corresponding auxiliary cell after the UE receives the random access response containing the current TA value;
the secondary cell activation unit is configured to activate the secondary cell by the primary cell base station.
8. The apparatus for timing synchronization of secondary cells under carrier aggregation according to claim 7, further comprising a network side synchronization issuing unit;
the network side synchronous sending unit is used for sending a Physical Downlink Control Channel (PDCCH) instruction of the auxiliary cell to the UE by the auxiliary cell base station under the state that the UE activates the connection state for the auxiliary cell of carrier aggregation; or, changing the PDCCH instruction of the auxiliary cell into a synchronous instruction of the auxiliary cell, wherein the synchronous instruction is used for indicating the UE to actively initiate a random access once;
the random access initiating unit is further configured to actively initiate a random access procedure to the secondary cell after the UE receives the PDCCH instruction of the secondary cell or the synchronization instruction of the secondary cell.
9. The apparatus for timing synchronization of a secondary cell under carrier aggregation according to claim 7, further comprising an active synchronization issuing unit, an active synchronization responding unit;
the active synchronization sending unit is used for actively sending timing synchronization request information to the auxiliary cell base station by the UE in a state that the UE activates the connection for the auxiliary cell of carrier aggregation, and the information is used for requesting the network side to send a PDCCH instruction;
the active synchronization response unit is used for sending a PDCCH instruction of the auxiliary cell to the UE after the auxiliary cell base station receives the timing synchronization request information;
the random access initiating unit is further configured to actively initiate a random access procedure to the secondary cell after the UE receives a PDCCH instruction of the secondary cell or a synchronization instruction of the secondary cell.
10. The apparatus for timing synchronization of secondary cells under carrier aggregation according to claim 7, wherein the random access initiation unit is further configured to actively initiate a random access procedure to the secondary cell by using random access channel RACH information in a secondary cell addition reconfiguration message when the secondary cell is added, in a state that the UE activates a connection for the secondary cell of carrier aggregation.
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