WO2013016985A1

WO2013016985A1 - Method and system for accessing auxiliary service cell, network-side network element, and user equipment

Info

Publication number: WO2013016985A1
Application number: PCT/CN2012/077260
Authority: WO
Inventors: 陈中明; 张健
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-08-01
Filing date: 2012-06-20
Publication date: 2013-02-07
Also published as: CN102917469B; CN102917469A

Abstract

Disclosed is a method for accessing an auxiliary service cell, comprising: at an uplink grant timing notified by a network side, a user equipment (UE) transmitting a random access preamble or uplink data to the network side via the auxiliary service cell; the network side calculating a time adjustment (TA) on the basis of the random access preamble or uplink data received, and feeding back to the UE; and, when the UE acquires the TA, performing data transmission and reception at the auxiliary service cell. Also disclosed are a system implementing the method for accessing the auxiliary service cell, a network-side network element, and the UE. Employment of the technical solution of the present invention allows the UE to reduce the time for accessing the auxiliary cell, thus providing the UE with high-speed operational service as quickly as possible. The present invention allows for expedited Scell access of the UE, and for providing the UE with Scell access as early as possible when the UE is under an intense service load.

Description

Method and system for accessing secondary service cell, network side network element, user equipment

The present invention relates to a secondary serving cell access technology, and in particular, to an efficient secondary service cell access method and system, a network side network element, and a user equipment. Background technique

In a wireless cellular communication system, a random access procedure is used for an idle state (RRC-IDLE) terminal (or UE (User Equipment)) to initially access the network, or a connection state (RRC- The CONNECTED) terminal performs uplink synchronization (Uplink synchronization) with the network and acquires resource allocation for subsequent data communication.

In the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) of the 3GPP (Third Generation Partnership Project) Long Term Evolution (LTE) system, the following six The event may trigger the random access procedure of the UE: (1) initial access in idle state; (2) RRC Connection Re-establishment procedure; (3) handover (HO, Handover); (4) RRC connection status downlink data arrival requires a random access procedure, for example, when the uplink synchronization status is "non-synchronized"; (5) RRC connection status uplink data arrival requires a random access procedure, for example, when the uplink synchronization status is "unsynchronized" or There is no physical uplink control channel (PUCCH, Physical Uplink Control Channel) resource transmission scheduling request (SR, Schedule Request); (6) RRC connection status requires random access procedure for positioning purposes, for example, UE positioning requires timing advance (Timing Advance ). The random access process has two different forms: Contention Based (for the first five events mentioned above); Non-Contention Based (for the above (3), (4), (6) Event). After the random access procedure is successful, normal downlink or uplink transmission can be performed. The random access procedure may be initiated by physical downlink control channel signaling (PDCCH order) or a media access control layer (MAC) of the UE, optionally, PDCCH order or radio resource control (RRC, Radio Resource Control). The signaling may allocate a random access preamble to the UE, and the random access procedure is a non-collision-based manner; otherwise, the UE needs to select a random access preamble, and the random access procedure is a conflict-based manner. The UE selecting the random access resource includes selecting a random access preamble and a time-frequency domain resource of a Physical Random Access Channel (PRACH). For non-conflicting random access procedures, there is no conflict resolution process. Figure 1 is a schematic diagram of an existing random access procedure. As shown in Figure 1, the contention based random access procedure mainly includes the following steps:

Step 101: The UE sends a random access preamble through a random access channel (RACH, Random Access CHannel). The timing of the UE sending the random access preamble is configured in a system message broadcast, and the main configuration is frequency. Domain and time domain resources, where the frequency domain is configured with prach-FreqOffset (frequency offset of PRACH), and the time domain is configured with prach-Configlndex (which subframes on PRACH can send random access preambles).

Step 102: A medium access control layer (MAC) of the base station (eNB) generates a random access response message and sends the message to the UE in a downlink shared channel (DL-SCH, Downlink-Shared Channel); the random access response The message includes at least a random access preamble ID (RAPID), a time adjustment (TA, Time Alignment) information, an initial uplink 4 authorization (UL Grant, Uplink Grant), and a temporary cell-wireless network temporary identifier (Temporary C). - RNTI); The random access response message is indicated by a random access-Radio Network Temporary Identifier (RA-RNTI) on a Physical Downlink Control CHannel (PDCCH, Phisical Downlink Control CHannel).

Step 103: The UE is in an uplink shared transport channel (UL-SCH, Uplink-Shared Channel) Sending a first scheduled transmission message; the content of the scheduled transmission message includes at least a cell-wireless network temporary identifier (C-RNTI), a media access control element (MAC Control Element), or includes a sneak resolution identifier (Community Control Channel Service Data Unit (CCCH SDU) of (Contention Resolution Identity); The transmission of the scheduled transmission message supports Hybrid Automatic Retransmission ReQuest ( HARQ).

Step 104: The base station sends a contention resolution message on the DL-SCH. The conflict resolution message is indicated by a C-RNTI or a temporary C-RNTI on the PDCCH, and may include a conflict resolution identifier. The message is sent to support HARQ.

The above steps 103 and 104 are used to resolve the conflict. Among the six events that trigger the random access procedure of the UE, (4) the RRC connection state downlink data arrival requires a random access procedure, and (5) the RRC connection state uplink data arrival requires a random access procedure, which triggers the Scell execution. The random access procedure, but does not exclude other events, triggering the Scell to perform a random access procedure, such as when the Scell is activated, triggering the execution of the random access procedure.

In order to provide mobile users with higher data rates, the Long Term Evolution (LTE-A) system proposes Carrier Aggregation (CA), which aims to provide greater bandwidth for UEs with corresponding capabilities. Data transmission increases the peak rate of the UE. In the LTE system, the maximum downlink transmission bandwidth supported by the system is 20 MHz. Carrier aggregation is to aggregate two or more component carriers (CC, Component Carriers) to support a transmission bandwidth greater than 20 MHz and a maximum of 100 MHz. The initial stage UL CC The total number of configurations is less than or equal to the total configuration of the DL CC. An LTE-A UE with carrier aggregation capability can transmit and receive data on multiple component carriers at the same time. The UEs referred to below refer to such UEs unless otherwise specified. In the LTE-A system, after the UE enters the connected state, it can communicate with the source base station through multiple component carriers (such as CC1 and CC2) at the same time. The base station specifies a primary component carrier (PCC) by explicit configuration or according to the protocol. , Primary Component Carrier ), other component carriers are called auxiliary The serving cell on the PCC is called a primary serving cell (Pcell, Primary Cell), and the serving cell on the SCC is called a secondary cell (Scell). The secondary serving cell is configured by the base station after the UE enters the connected state. In general, a serving cell has symmetric uplink and downlink (Scell can only configure downlink). It is clearly indicated in the system information block SIB2 that in order to avoid interference of the control channel, the concept of cross-carrier scheduling is introduced, that is, when If the PDCCH interference of a certain Scell is severe, the PDCCH of the Scell is not enabled, but the PDSCH of the Scell is scheduled by another serving cell, where another serving cell can be configured through RRC signaling. The base station only allocates one C-RNTI to the UE, that is, the C-RNTI of each serving cell is the same.

According to RellO, in the initial stage of carrier aggregation, the number of Scells is as small as one, and the scenario is limited to that if the uplink RRH and the repeater are not supported, only one TA exists, and the UE only needs to initiate uplink synchronization on the Pcell. It will not be initiated on Scell. In the subsequent stage, due to the increase in the amount of Scell data, the number of Scells will increase to four, and the scene will be relaxed. For example, the uplink RRH and repeater are supported. At this time, one TA will not solve the problem, so multiple TAs will be introduced. At this time, the uplink synchronization is also initiated on the Scell, and the random access process is performed after the Scell is activated. The Scell must perform normal uplink data transmission and reception after the uplink synchronization is completed. If the non-conflicting random access procedure is performed on the Scell, the time is relatively short. If the random access procedure of the collision is performed, the time will be longer. In order to improve the user experience, it is necessary to shorten the random access process of the conflict or speed up the Scell to send uplink data. Summary of the invention

In view of the above, the main purpose of the present invention is to provide a method and system for accessing a secondary serving cell, a network side network element, and a user equipment, which can enable the Scell to be quickly accessed when the Scell needs to be used.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for accessing a secondary serving cell includes: The user equipment UE sends the uplink data or the random access preamble to the network side through the secondary serving cell at the timing of sending the uplink data or the random access preamble notified by the network side;

After receiving the time adjustment TA fed back by the network side, the UE completes access of the secondary serving cell.

Preferably, the TA is calculated by the network side according to the random access preamble or the uplink data sent by the UE.

Preferably, the timing of sending the uplink data or the random access preamble is that the network side is the earliest random access preamble or uplink data transmission timing determined by the UE.

Preferably, the timing of transmitting the uplink data or the random access preamble is a subframe in the current frame or the next frame that satisfies the timing condition of sending the uplink data or the random access preamble.

Preferably, the method further includes:

Receiving, by the UE, the notification of the timing of sending the uplink data or the random access preamble and the notification of the activation command of the secondary serving cell that are sent by the network side; or, the UE receiving the network side A notification sent by the activation command of the secondary serving cell to the timing of sending the uplink data or the random access preamble.

Preferably, the method further includes:

The UE determines that the secondary serving cell and the primary serving cell need to use different TAs;

Alternatively, the UE receives a notification that the secondary serving cell and the primary serving cell that are sent by the network side need to use different TAs.

Preferably, the method further includes:

The UE notifies, by the primary serving cell, that the network side needs to activate the secondary service cell or needs to acquire the TA of the secondary serving cell.

Preferably, the network side is a base station.

A method for accessing a secondary serving cell includes:

The network side notifies the UE of the timing of sending uplink data or random access preamble; After receiving the uplink data or the random access preamble sent by the UE through the secondary serving cell, the network side calculates the TA and feeds back to the UE, so that the UE accesses the secondary serving cell.

Preferably, the method further includes:

Sending, by the network side, the notification of the timing of sending the uplink data or the random access preamble and the activation command of the secondary serving cell to the UE; or, the network side is sending the auxiliary The activation command of the serving cell sends a notification to the UE of the timing of sending the uplink data or the random access preamble.

Preferably, the method further includes:

The network side notifies the UE that the secondary serving cell and the primary serving cell need to use different

TA.

A system for accessing a secondary serving cell, including a UE and a network side, where

The network side is configured to calculate a TA according to the received random access preamble or uplink data, and send the TA to the UE; and notify the UE to send uplink data or a random access preamble;

a UE, configured to send a random access preamble or uplink data to the network side by using the secondary serving cell at the timing of sending the uplink data or the random access preamble; and, after receiving the TA, completing the secondary serving cell Access.

Preferably, the uplink granting opportunity is a subframe that satisfies the timing condition of sending the uplink data or the random access preamble in the current frame or the next frame.

Preferably, the network side is further configured to send, to the UE, a notification of the timing of sending the uplink data or the random access preamble and a notification of the activation command of the secondary serving cell; or Sending a message to the UE after the notification of the activation command of the secondary serving cell Notification of the timing of sending uplink data or random access preamble.

Preferably, the UE is further configured to: determine that the secondary serving cell and the primary serving cell need to be different.

TA;

Or the network side is further configured to notify the UE that the secondary serving cell and the primary serving cell need to use different TAs.

Preferably, the UE is further configured to:

Notifying, by the primary serving cell, that the network side needs to activate the secondary serving cell or need to acquire the TA of the secondary serving cell.

A network side network element, including a determining unit, a receiving unit, a calculating unit, and a sending unit;

a determining unit, configured to determine, for the UE, an opportunity to send uplink data or a random access preamble; and a receiving unit, configured to receive random access preamble or uplink data sent by the UE;

a calculation unit, configured to calculate a TA;

a sending unit, configured to send the TA to the UE; and send, to the UE, the timing of sending the uplink data or the random access preamble.

Preferably, the determining unit is further configured to: determine an earliest random access preamble or uplink data transmission occasion determined by the UE, where the uplink grant timing is that the uplink data is satisfied in a current frame or a next frame. Or a subframe that randomly accesses the preamble timing condition.

A user equipment, including a sending unit and an access unit, where

a sending unit, configured to send a random access preamble or uplink data to the network side by using the secondary serving cell when the uplink data or the random access preamble is notified by the network side;

The access unit is configured to complete the access of the secondary serving cell after receiving the TA sent by the network side.

In the present invention, when the base station determines the uplink grant timing or the timing of transmitting the preamble for the Scell of the UE, the base station selects the uplink access opportunity as early as possible, instead of the normal timing for the UE to send the uplink access preamble. (such as the first subframe of each frame), so that the UE does not have to wait for a long enough time to access the ScelL. The present invention enables the Scell access of the UE to be more quickly, and provides the Scell for the UE early when the service load of the UE is heavy. Access. DRAWINGS

FIG. 1 is a schematic diagram of an existing random access process;

2 is a flowchart of a method for accessing a secondary serving cell according to the present invention;

3 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention;

4 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention;

6 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention;

FIG. 7 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a network side network element according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. detailed description

The basic idea of the present invention is: When the base station determines the timing of transmitting the uplink grant opportunity or the random access preamble for the Scell of the UE, the base station selects the uplink access opportunity as early as possible, instead of the normal time for the UE to send the uplink access preamble (such as The first subframe of each frame), so that the UE does not have to wait long enough to access the Scell.

The present invention will be further described in detail below with reference to the accompanying drawings.

2 is a flowchart of a method for accessing a secondary serving cell according to the present invention. As shown in FIG. 2, the method for accessing a secondary serving cell of the present invention mainly includes the following steps:

Step 201: The UE sends a random access preamble or uplink data to the base station.

Step 202: The base station calculates a TA according to the received random access preamble or uplink data, and provides feedback. After the UE acquires the TA, the UE can normally send and receive data on the cell. The base station may also feed back the initial uplink grant (UL Grant) and the TA to the UE.

The essence of the technical solution of the present invention will be further clarified by specific examples below.

The application scenario of the following embodiments of the present invention is that, in the LTE-A system, the base station 1 is a base station having carrier aggregation capability. Base station 1 governs two cells, Celll and Cell2. Some or all of the two cells may provide carrier aggregation capabilities to the user equipment to extend the bandwidth of the transmission. The UE1 accesses the network through the base station 1 (or the network switches the UE to the base station 1), and the base station 1 configures two simultaneously working cells (Celll, Cell2) according to the capability of the UE1, where the Celll provides the NAS layer for the UE1. The mobility information, such as the PLMN, the global cell identifier CGI, the location area identifier TAC, and the like, is the primary cell (Pcell) or the primary serving cell of the UE1, and the UE1 only receives the system message and the paging message of the primary cell. Celll and Cell2 may be RRH cells, or cells that have passed through a repeater, or are ordinary cells. These two cells are FDD. For the TDD cell, the process is the same and will not be repeated.

Embodiment 1

In this embodiment, Cell2 schedules itself, and the UE in the Cell2 broadcast sends a random access preamble at a time of prach-FreqOffset=10, prach-ConfigIndex=3 (subframe 1 of any radio frame can be randomly sent) Access to the predecessor). FIG. 3 is a flowchart of a method for accessing a secondary service cell according to an embodiment of the present invention. As shown in FIG. 3, the method for accessing a secondary serving cell in the embodiment of the present invention mainly includes the following steps:

Step 301: The base station sends a MAC CE to the UE, and includes a command to activate the Cell2, and the UE activates the Cell2 after receiving the command.

Step 302: The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to perform the process of acquiring the TA on the Cell2, and notify the UE that the subframe can be initiated on the subframe 5 of the next radio frame. Random access preamble (subframe 5 is selected here to distinguish it from subframe 1 in the system message broadcast, and may be any other than subframe 1 For each subframe, the radio frame may also be the current radio frame, and the base station determines the earliest feasible transmission timing and notifies the UE). Here, the random access preamble transmission timing can be combined with the activation command to notify the UE.

Step 303: The UE performs a process of acquiring a TA on the Cell2, and selects a common preamble by itself, and sends the PRACH to the base station at a specified timing.

Step 304: The base station receives the common preamble, calculates a TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cell2, where the message includes the TA, and may also include an uplink grant; the message passes the RA-RNTI on the PDCCH on the Cell2. (or C-RNTI) for instructions.

Step 305: After obtaining the TA, the UE considers that the access to the Cell2 is successful, and can normally send and receive data on the Cell2, and automatically prohibits sending the random access preamble on the subframe 5.

In this embodiment, if the UE does not receive the response of the base station at the specified time, the random access preamble is automatically sent again in the designated subframe of the next radio frame, such as the subframe 5. If the attempt is not successful after the specified number of times, the UE abandons try.

Embodiment 2

In this embodiment, Cell2 schedules itself by itself. FIG. 4 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention. As shown in FIG. 4, the method for accessing a secondary serving cell in the embodiment of the present invention mainly includes the following steps:

Step 401: The base station sends a MAC CE to the UE, and includes a command to activate the Cell2, and the UE activates the Cell2 after receiving the command;

Step 402: The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to perform the process of acquiring the TA on the Cell2, and notify the UE that the UE can be authorized in the uplink authorization of the Cell2. The timing sends random access preamble or uplink data. The uplink grant here can be combined with the activation command to notify the UE.

Step 403: The UE performs the process of acquiring the TA on the Cell2, and selects a common preamble, and sends the signal to the base station through the UL SCH of the Cell2 at the specified timing, and the UE may also send the UE. An uplink data is sent to the base station.

Step 404: The base station receives the common preamble or uplink data, calculates a TA, and generates a response message to be sent to the UE in the DL-SCH of the Cell2, where the message includes the TA, and may also include an uplink grant; the message passes on the PDCCH on the Cell2. The RA-RNTI (or C-RNTI) is indicated.

Step 405: After obtaining the TA, the UE considers that the access to the Cell2 is successful, and can normally send and receive data on the Cell2.

In this embodiment, if the UE does not receive the response of the base station at the specified time, it automatically gives up. Embodiment 3

In this embodiment, Cell2 is scheduled by Pcell, and the timing of the UE in the Cell2 broadcast sending the random access preamble is prach-FreqOffset=10, prach-ConfigIndex=3 (subframe 1 of any radio frame can be randomly accessed) FIG. 5 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention. As shown in FIG. 5, the method for accessing a secondary serving cell in the embodiment of the present invention mainly includes the following steps:

Step 501: The base station sends a MAC CE to the UE, and includes a command to activate the Cell2, and the UE activates the Cell2 after receiving the command.

Step 502: The base station notifies the UE, or the UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to perform the process of acquiring the TA on the Cell2, and notify the UE that the subframe can be initiated on the subframe 5 of the next radio frame. Random access preamble (here, subframe 5 is selected to be distinguished from subframe 1 in the system message broadcast, and may be any subframe other than subframe 1, and the radio frame may also be the current radio frame, which is Determine the earliest possible transmission timing and notify the UE). Here, the random access preamble transmission timing can be combined with the activation command to notify the UE.

Step 503: The UE performs a process of acquiring a TA on the Cell2, and selects a common preamble by itself, and sends the PRACH to the base station at a specified timing.

Step 504: The base station receives the public preamble, calculates a TA, and generates a response message in Cell2. The DL-SCH is sent to the UE, and the message includes a TA, and may also include an uplink grant; the message is indicated by RA-RNTK or C-RNTI on the PDCCH of the Cell2 associated with the Pcell.

Step 505: After obtaining the TA, the UE considers that the access to the Cell2 is successful, and can normally send and receive data on the Cell2, and automatically prohibits sending the random access preamble on the subframe 5.

Embodiment 4

In this embodiment, Cell1 schedules itself, and the UE in the Cell2 broadcast sends a random access preamble at the time of prach-FreqOffset=10, prach-ConfigIndex=3 (subframe 1 of any radio frame can be randomly sent) Access to the predecessor). FIG. 6 is a flowchart of a method for accessing a secondary service cell according to an embodiment of the present invention. As shown in FIG. 6, the method for accessing a secondary serving cell in the embodiment of the present invention mainly includes the following steps:

Step 601: The UE has uplink data arrival, and the data volume is relatively large. At this time, the cell 2 is in an out-of-synchronization state, and the UE has been deactivated. The UE learns that the Cell 2 and the Celll need to use different TAs according to the pre-configuration information of the base station, and needs to acquire the cell on the Cell2. TA.

Step 602: The UE notifies the base station through the Pcell, needs to activate the Cell2, or needs to perform the process of acquiring the TA on the Cell2.

The notification message contains the cell identifier that needs to be activated or needs to acquire the TA.

Step 603: Send a MAC CE to the UE, and include a command to activate the Cell2, and the UE activates the Cell2 after receiving the command.

Step 604, the base station notifies the UE that the random access preamble can be initiated on the subframe 5 of the next radio frame (the subframe 5 is selected here to distinguish from the subframe 1 in the system message broadcast, and may be other than the subframe 1 In any one subframe, the radio frame may also be the current radio frame, and the base station determines the earliest feasible transmission opportunity and notifies the UE). Here, the random access preamble transmission timing can be combined with the activation command to notify the UE.

Step 605: The UE performs the process of acquiring the TA on the Cell2, and selects a common preamble by itself, and sends the PRACH to the base station at the specified timing. Step 606: The base station receives the common preamble, calculates the TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cell2, where the message includes the TA, and may also include an uplink grant; the message passes the RA-RNTI on the PDCCH on the Cell2. (or C-RNTI) for instructions.

Step 607: After obtaining the TA, the UE considers that the access to the Cell2 is successful, and can normally send and receive data on the Cell2, and automatically prohibits sending the random access preamble on the subframe 5.

Embodiment 5

In this embodiment, Cell2 is scheduled by Pcell, and the timing of the UE in the Cell2 broadcast sending the random access preamble is prach-FreqOffset=10, prach-ConfigIndex=3 (subframe 1 of any radio frame can send a random access preamble ). FIG. 7 is a flowchart of a method for accessing a secondary serving cell according to an embodiment of the present invention. As shown in FIG. 7, the method for accessing a secondary serving cell in the embodiment of the present invention mainly includes the following steps:

Step 701: The UE has downlink data arrives, and the amount of data is relatively large. At this time, Cell2 is in an out-of-synchronization state, and has been deactivated. The base station notifies the UE that Cell2 and Celll need to use different TAs, and needs to perform a TA process on Cell2. The UE activates the Cell2 itself.

Step 702: The base station notifies the UE that the subframe may be in the current radio frame or the subframe n of the next radio frame (the subframe n is normal, and the subframe of the random access preamble may be sent. In this embodiment, the subframe 3 is subframe 3 n is a subframe 4) to initiate a random access preamble (here, after selecting a normal subframe, 3 subframes, that is, subframe 4, is to distinguish from subframe 1 in the system message broadcast, and may be any other than subframe 1 The subframe, the radio frame may also be the current radio frame, and the base station determines the earliest feasible transmission opportunity and notifies the UE). Here, the random access preamble transmission timing can be combined with the activation command to notify the UE.

Step 703: The UE performs a process of acquiring a TA on the Cell2, and selects a common preamble by itself, and sends the PRACH to the base station at a specified timing.

Step 704: The base station receives the common preamble, calculates a TA, and generates a response message, which is sent to the UE in the DL-SCH of the Cell2, where the message includes the TA, and may also include an uplink grant; The indication is performed by RA-RNTK or C-RNTI on the Cell2-related PDCCH on the Pcell. Step 705: After obtaining the TA, the UE considers that the access to the Cell2 is successful, and may receive downlink data on the DL-SCH on the Cell2 and perform normal feedback, and automatically prohibit the transmission of the random access preamble on the subframe 4.

The present invention also describes a system for accessing a secondary serving cell, including a UE and a network side, where

The UE is configured to send, by using the secondary serving cell, the random access preamble or the uplink data to the network side by using the secondary serving cell, and acquiring the TA fed back by the network side, and performing data transmission and reception on the secondary serving cell. ;

The network side is configured to calculate a time adjustment TA according to the received random access preamble or uplink data, and feed back to the UE; and notify the UE of an uplink authorization opportunity.

It should be understood by those skilled in the art that the system for accessing the secondary service cell of the present invention does not improve the structure of the existing communication network, and only improves the functions and interaction modes of some network elements, and the following will be improved. Partially detailed description.

In the system for accessing the secondary serving cell of the present invention, the uplink granting opportunity is the earliest random access preamble or uplink data sending occasion determined by the network side for the UE.

In the system for accessing the secondary serving cell of the present invention, the uplink granting opportunity is a subframe after the first subframe in the current frame or the next frame.

In the system for accessing the secondary serving cell of the present invention, the network side is further configured to: send, to the UE, a notification of the uplink authorization opportunity and a notification of an activation command of the secondary serving cell; or Notifying the UE of the uplink authorization opportunity after the notification of the activation command of the secondary serving cell

In the system for accessing the secondary serving cell of the present invention, the UE is further configured to: determine that the secondary serving cell and the primary serving cell need to use different TAs;

Or the network side is further configured to notify the UE that the secondary serving cell and the primary serving cell need to use different TAs. The above network side network element mainly refers to a base station.

FIG. 8 is a schematic structural diagram of a network side network element according to an embodiment of the present invention. As shown in FIG. 8, the network side network element of the embodiment of the present invention includes a determining unit 80, a receiving unit 81, a calculating unit 82, and a sending unit 83. ,

a determining unit 80, configured to determine, for the UE, a timing for sending uplink data or a random access preamble;

The receiving unit 81 is configured to receive the random access preamble or uplink data sent by the UE, and the calculating unit 82 is configured to calculate the TA.

The sending unit 83 is configured to send the TA to the UE, and send the timing of sending the uplink data or the random access preamble to the UE.

The determining unit 80 is further configured to: determine an earliest random access preamble or an uplink data transmission occasion determined by the UE, where the uplink grant timing is that the uplink data or the random connection is satisfied in the current frame or the next frame. Subframe into the predecessor timing condition.

The above network side network element mainly refers to a base station.

It should be understood in the art that the implementation functions of the processing units of the network side network element shown in FIG. 8 can be understood by referring to the related description of the foregoing access control method and system. Its function can be realized by a program running on the processor, or by a specific logic circuit.

FIG. 9 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 9, the UE in the embodiment of the present invention includes a sending unit 90 and an access unit 91, where

The sending unit 90 is configured to send a random access preamble or uplink data to the network side by using the secondary serving cell at a timing of sending the uplink data or the random access preamble notified by the network side;

The access unit 91 is configured to complete access of the secondary serving cell after receiving the TA sent by the network side.

The above network side network element mainly refers to a base station.

It should be understood in the art that the implementation functions of the processing units of the user equipment shown in FIG. 9 It can be understood by referring to the related description of the method and system of the foregoing access control. Its function can be realized by a program running on the processor, or can be realized by a specific logic circuit.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the present invention, when the base station determines the uplink grant timing or the timing of transmitting the preamble for the Scell of the UE, the base station selects the uplink access opportunity as early as possible, instead of the normal time when the UE sends the uplink access preamble (such as the first subframe of each frame). In this way, the UE does not have to wait long enough to access the Scell.

Claims

A method for accessing a secondary serving cell, the method comprising:

The user equipment sends the uplink data or the random access preamble to the network side through the secondary serving cell at the timing of sending the uplink data or the random access preamble notified by the network side;

2. The method according to claim 1, wherein

The TA is calculated by the network side according to the random access preamble or the uplink data sent by the UE.

The method according to claim 1, wherein the timing of transmitting the uplink data or the random access preamble is that the network side is the earliest random access preamble or uplink data transmission timing determined by the UE.

The method according to any one of claims 1 to 3, wherein the timing of transmitting the uplink data or the random access preamble is that the sending uplink data or the random access preamble is satisfied in the current frame or the next frame. The sub-frame of the timing condition.

5. The method according to claim 1, wherein the method further comprises:

6. The method according to claim 1, wherein the method further comprises:

The method according to claim 1, wherein the method further comprises: The UE notifies, by the primary serving cell, that the network side needs to activate the secondary serving cell or needs to acquire the TA of the secondary serving cell.

The method according to any one of claims 1 to 7, wherein the network side is a base station.

A method for accessing a secondary serving cell, the method comprising:

The network side notifies the UE of the timing of sending uplink data or random access preamble;

After receiving the uplink data sent by the UE through the secondary serving cell or randomly accessing the preamble, the network side calculates the TA and feeds back to the UE, so that the UE accesses the secondary serving cell.

10. The method according to claim 9, wherein the timing of transmitting the uplink data or randomly accessing the preamble is that the network side is the earliest random access preamble or uplink data transmission timing determined by the UE.

The method according to claim 9 or 10, wherein the method further comprises: sending, by the network side, the notification and the location of the timing of sending the uplink data or the random access preamble to the UE The notification of the activation command of the secondary serving cell is performed; or the network side sends a notification to the UE of the timing of sending the uplink data or the random access preamble after transmitting the activation command of the secondary serving cell.

The method according to claim 9 or 10, wherein the method further comprises: the network side notifying the UE that the secondary serving cell and the primary serving cell need to use different

TA.

A system for accessing a secondary serving cell, comprising a UE and a network side, where: a network side, configured to calculate a TA according to the received random access preamble or uplink data, and send the TA to the UE; The timing at which the UE sends uplink data or a random access preamble;

The system according to claim 13, wherein the timing of transmitting the uplink data or randomly accessing the preamble is that the network side is the earliest random access preamble or uplink data transmission timing determined by the UE.

The system according to claim 13 or 14, wherein the uplink grant timing is a subframe in a current frame or a next frame that satisfies a timing condition of the uplink data or a random access preamble.

16. The system of claim 13 wherein

The network side is further configured to send, to the UE, a notification of the timing of sending the uplink data or randomly accessing the preamble and a notification of the activation command of the secondary serving cell;

Alternatively, a notification of the timing of transmitting the uplink data or the random access preamble is sent to the UE after the notification of the activation command of the secondary serving cell.

17. The system of claim 13 wherein

The UE is further configured to: determine that the secondary serving cell and the primary serving cell need to use different TAs;

The system according to claim 13, wherein the UE is further configured to:

19. A network side network element, comprising: a determining unit, a receiving unit, a calculating unit, and a sending unit; wherein:

a calculation unit, configured to calculate a TA;

The network side network element according to claim 19, wherein the determining unit is further configured to: determine, by the UE, an earliest random access preamble or uplink data transmission occasion; wherein, the uplink authorization timing is A subframe that satisfies the timing condition of transmitting the uplink data or the random access preamble in the current frame or the next frame.

A user equipment, comprising: a sending unit and an access unit, where the sending unit is configured to send, by the network side, the uplink data or the random access preamble, and send the uplink to the network side by using the secondary serving cell Random access to preamble or uplink data;