CN109219142B - Method and terminal for configuring and activating SCell in cross eNB carrier aggregation system - Google Patents
Method and terminal for configuring and activating SCell in cross eNB carrier aggregation system Download PDFInfo
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Abstract
The application discloses a method and a terminal for configuring an SCell in a cross-eNB carrier aggregation system, wherein an eNB to which a PCell belongs (hereinafter abbreviated as PCell eNB) and an eNB to which the SCell belongs (hereinafter abbreviated as SCell eNB) are two different eNBs, and the method for configuring the SCell comprises the following steps: an eNB of a main Cell (PCell) sends an SCell configuration request message to an eNB of the SCell; the eNB of the SCell distributes a UE special physical layer configuration parameter and a C-RNTI in the SCell for the UE and sends the UE through the eNB of the PCell; and the UE configures the SCell according to the UE special physical layer configuration parameter, the C-RNTI, the identification of the SCell sent by the eNB of the PCell and the SCell general physical layer configuration parameter required by the UE. The application also discloses a method and a terminal for activating the SCell in the cross eNB carrier aggregation system. By applying the method and the device, the configuration and activation of the SCell can be conveniently realized, and the minimum system change is ensured.
Description
The present application is a divisional application of an inventive patent application with the application number "201210270102.6" entitled "method and terminal for configuring and activating scells in a cross eNB carrier aggregation system".
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and a terminal for configuring and activating SCell (Secondary Cell) in a system supporting cross-eNB carrier aggregation (Inter-eNB CA, inter-eNB Carrier Aggregation).
Background
In the current LTE (Long Term Evolution) system, the maximum bandwidth supported by each cell is 20MHz, and in order to improve the peak rate of the UE, the LTE-Advanced system introduces a carrier aggregation technology. Through carrier aggregation technology, the UE can communicate with cells which are controlled by the same eNB and work at different carrier frequencies at the same time, so that the transmission bandwidth reaches 100MHz at the highest, and the uplink and downlink peak rates of the UE can be increased by times.
For UEs operating under carrier aggregation, the aggregated cells are divided into PCell (Primary Cell) and SCell (Secondary Cell).
The PCell can only be one and is always in an active state, the PCell can only be changed through a handover procedure, and the UE can only transmit and receive NAS information in the PCell, and the PUCCH can only be transmitted in the PCell.
Depending on the UE's capabilities, the eNB may configure the UE with one or more scells through an RRC reconfiguration (RRC Reconfigurarion) procedure. The configuration procedure of scells as shown in fig. 1, the configuration information of each SCell is contained in a SCellToAddModList-r10 message in the RRCConnectionReconfiguration message, and the SCellToAddModList-r10 message contains an index (SCellIndex) of each SCell, a physical ID of the SCell, a downlink carrier frequency, a cell-specific radio resource configuration parameter, a UE-specific radio resource configuration parameter, and the like. Wherein the cell-specific radio resource configuration parameters include the content of the intra-SCell system broadcast message required by all UEs to ensure that the UEs do not need to obtain the required SCell cell-specific radio resource configuration information by reading the intra-SCell system broadcast message.
In order to reduce the power consumption of the UE, the SCell is in an inactive state (Deactivated) after configuration. The eNB activates and deactivates one SCell through the MAC control unit of the MAC layer, and the MAC control unit of the activated/deactivated SCell occupiesWith one byte, as shown in fig. 2, the MAC control element corresponds to a logical channel ID of 11011. Wherein R is a reserved bit, set to 0; c (C) i The state of the SCell corresponding to SCellIndex i, i.e. if C i 1, SCell with scellindex=i is active; if C i SCell with scellindex=i is inactive.
After each SCell activation, the UE starts a corresponding deactivation timer. If the UE detects a PDCCH on the SCell or a PDCCH for the SCell on other serving cells, the deactivation timer is restarted. If the deactivation timer expires, the UE considers the SCell to enter an inactive state. In addition, if the UE receives the RRC reconfiguration message with the handover command, the UE considers all configured scells to enter an inactive state. The SCell enters an inactive state from an active state, and the UE will empty all HARQ buffers corresponding to the SCell.
If one SCell is in or enters the inactive state from the active state, the UE should:
-not listening for PDCCH on the SCell;
-not listening to PDCCH for the SCell;
-not transmitting SRS and UL-SCH on the SCell;
-not reporting CQI/PMI/RI of the SCell;
conversely, if one SCell is in active state, the UE needs to:
listening for PDCCH on the SCell (in case of self-scheduling);
-listening to PDCCH for the SCell;
-transmitting SRS on the SCell according to configuration of eNB
Reporting CQI/PMI/RI of the SCell, etc.
In order to keep the behaviors between the eNB and the UE consistent in time, if the UE receives an SCell activation command on subframe n, the operation of the UE in the SCell activation state should be performed from subframe n+8; if the UE receives the SCell deactivation command on subframe n, CSI-independent operation of the UE in the SCell deactivated state should be performed before subframe n+8, and CSI-dependent operation of the UE in the SCell deactivated state should be performed in subframe n+8.
According to the specification of the current LTE-Advanced protocol, the time advance of the PUSCH and the SRS in the SCell is the same as that in the PCell.
In order to expand the application range of the carrier aggregation technology, the peak rate of the UE is further improved, and the carrier aggregation technology across enbs may become the development direction of LTE-Advanced. By cross-eNB carrier aggregation technique, it is meant that cells that transmit data simultaneously with the same UE are not limited to the same eNB, i.e., the cells may belong to different enbs, as shown in fig. 3. In this way, in a network environment overlapped by different enbs, the operating bandwidth of the UE may still be increased by carrier aggregation techniques.
However, the cross-eNB carrier aggregation technology is different from the existing same eNB carrier aggregation technology in that it also brings new problems to the application of the carrier aggregation technology, for example, during the SCell configuration process, the SCell needs to configure dedicated radio resource parameters for the UE, where the parameters are different from cell-specific radio resource configuration parameters, the former is dynamic, and the latter is semi-static. This requires the PCell-dependent eNB to interact with the SCell-dependent eNB before configuring the SCell for the UE to obtain the dedicated radio configuration parameters configured by the SCell-dependent eNB for the UE. In addition, in cross-eNB carrier aggregation, the difference of eNB geographical positions will cause a large difference in distance between the UE and different enbs, so that the time advance of the UE for transmitting uplink data in the SCell cannot be equal to the time advance of the UE for transmitting data in the PCell, which will affect the activation method of the SCell.
It can be seen that in the carrier aggregation technology across enbs, the SCell configuration and activation procedure will face many new problems, and the methods described in the existing LTE-Advanced protocol cannot be simply reused, and there is no solution for these problems in terms of the current research results.
Disclosure of Invention
In view of this, the present application provides a method and terminal for configuring and activating scells in a cross-eNB carrier aggregation system.
In order to achieve the above purpose, the present application adopts the following technical scheme:
a method of configuring an SCell in a cross-eNB carrier aggregation system, a PCell eNB and an SCell eNB being two different enbs, the method of configuring the SCell comprising:
the PCell eNB sends an SCell configuration request message to the SCell eNB;
the SCell eNB allocates UE special physical layer configuration parameters and C-RNTI in the SCell to the UE and sends the parameters to the UE through the PCell eNB;
and the UE configures the SCell according to the UE special physical layer configuration parameter, the C-RNTI, the identification of the SCell sent by the PCell eNB and the SCell general physical layer configuration parameter required by the UE.
Preferably, the transmitting, by the PCell eNB, to the UE includes:
the SCell eNB sends the UE-dedicated physical layer configuration parameters and the C-RNTI to the PCell eNB through an SCell configuration request feedback message, and the PCell eNB sends the PCell eNB to the UE through an RRC reconfiguration message; the RRC reconfiguration message further comprises an identification of the SCell and SCell general physical layer configuration parameters required by the UE.
Preferably, the UE-specific physical layer configuration parameters include: PDSCH configuration parameters, PUSCH configuration parameters, and uplink power control parameters of the UE within the SCell;
and/or, the general physical layer configuration parameters of the SCell required by the UE include RACH and PRACH configuration parameters in the SCell cell;
and/or the SCell configuration request message comprises an initial ID of the UE, wherein the initial ID of the UE comprises one or more of an S-TMSI of the UE, a C-RNTI of the UE in the PCell and a random value for contention resolution of the UE.
A method of activating an SCell in a cross-eNB carrier aggregation system, a PCell of a UE different from the SCell eNB, the method of activating the SCell comprising:
the PCell eNB sends an SCell activation request message to the SCell eNB, wherein the SCell activation request message comprises the identification of the UE;
the SCell eNB feeds back an SCell activation request response message to eBN of the PCell to inform whether the PCell allows activation of the SCell;
when the activation of the SCell is allowed, the PCell eNB informs the UE of activating the SCell, and the UE realizes communication with the SCell eNB according to the notification.
Preferably, when the SCell eNB notifies that the PCell does not allow activation of the SCell, the SCell activation request response message further includes a reason and/or delay time for rejecting activation of the SCell.
Preferably, when the SCell activation request response message further includes a reason for rejecting SCell activation, the PCell eNB saves the reason.
Preferably, when the SCell activation request response message further includes a deferral time, the PCell eNB sends a next SCell activation request to the SCell at least after the deferral time.
Preferably, before sending the SCell activation request message, if a Radio Bearer (RB) corresponding to a service requirement for activating the SCell is not yet established in the SCell, the SCell activation request message further includes information of RB establishment.
Preferably, the notifying, by the PCell eNB, the UE to activate the SCell includes: if the SCell activation request response message received by the PCell includes special PRACH resource information allocated by the SCell eNB for the UE, the PCell eNB informs the UE to activate the SCell through a PDCCH Order and carries the special PRACH resource information;
the UE implementing communication with the SCell eNB according to the notification includes: and the UE initiates a non-competitive PRACH process through the special PRACH resource indicated by the PDCCH Order, acquires uplink synchronization with the SCell eNB, acquires PUCCH and SRS configuration, and realizes communication with the SCell eNB.
Preferably, the notifying, by the PCell eNB through PDCCH Order, the UE to activate the SCell includes:
and carrying the special PRACH resource information in the PDCCH Order, and setting a Carrier Indicator domain of the PDCCH Order as the identification of the SCell.
Preferably, the notifying, by the PCell eNB, the UE to activate the SCell includes: if the SCell activation request response message received by the PCell does not include the special PRACH resource information allocated by the SCell eNB for the UE, the PCell eNB informs the UE to activate the SCell through a bit corresponding to the SCell in an SCell activation/deactivation control unit of an MAC layer;
the UE implementing communication with the SCell eNB according to the notification includes: when the UE receives bits corresponding to the SCell in an SCell activation/activation control unit of the MAC layer, if the bits are still in a synchronous state with the SCell eNB, the UE realizes communication with the SCell eNB according to the current PUCCH and SRS configuration; if the UE is in an out-of-step state with the SCell eNB, the UE acquires uplink synchronization with the SCell eNB through a PRACH process of a contention mode according to RACH and PRACH configuration of the SCell, acquires PUCCH and SRS configuration, and realizes communication with the SCell eNB.
Preferably, after the SCell eNB receives the uplink signal sent by the UE for the first time, the SCell eNB sends a SCell activation success notification to the PCell eNB.
Preferably, after the data transmission between the UE and the SCell eNB is finished, the method further includes: the SCell eNB informs the PCell eNB that the service ends, and the PCell eNB informs the UE to deactivate the SCell;
or the UE triggers the deactivation of the SCell according to an SCell deactivation timer corresponding to the SCell.
Preferably, after the SCell is deactivated and before the uplink synchronization timer corresponding to the SCell expires, the UE keeps the uplink synchronization timer running.
Preferably, the identification of the UE includes: one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
A method for a terminal to activate an SCell, comprising:
a UE supporting cross eNB carrier aggregation receives a notification of activating an SCell sent by a PCell eNB through a PDCCH Order; wherein, the PCell eNB and the SCell eNB are two different eNBs;
and the UE initiates a non-competitive PRACH process through the special PRACH resource indicated by the PDCCH Order, acquires uplink synchronization with the SCell eNB, acquires PUCCH and SRS configuration, and performs communication with the SCell eNB according to the PUCCH and SRS configuration.
Preferably, the method for determining that the notification of activating the SCell is sent through PDCCH Order by the UE includes:
the UE receives the PDCCH Order, and Carrier Indicator domain of the PDCCH Order is the identification of the SCell.
A terminal supporting cross-eNB carrier aggregation, comprising: an interface unit activating the communication unit;
the interface unit is configured to receive a notification of activation of an SCell sent by a PCell eNB through PDCCH Order, notify the activation communication unit, and send a dedicated PRACH resource indicated by the PDCCH Order to the activation communication unit;
and the activation communication unit is used for initiating a non-competitive PRACH process according to the special PRACH resource sent by the interface unit after receiving the notification of the interface unit, acquiring uplink synchronization with the SCell eNB, acquiring PUCCH and SRS configuration, and realizing communication with the SCell according to the acquired PUCCH and SRS configuration.
According to the scheme provided by the application, before the eNB (hereinafter abbreviated as PCell eNB) to which the PCell belongs configures the SCell, the information required by the UE for configuring the SCell can be obtained through signaling interaction with the eNB (hereinafter abbreviated as SCell eNB) to which the SCell belongs; before the activation of the SCell, the PCell eNB informs the SCell eNB of service information required by UE which is about to carry out carrier aggregation with the SCell through signaling, and obtains the confirmation of the SCell eNB; the PCell eNB determines the mode of activating the SCell according to whether the SCell activation response message replied by the SCell eNB is provided with a special PRACH resource indication; and the UE determines the step of activating the SCell according to the received SCell activation instruction and the uplink synchronous state of the current SCell and the SCell. The scheme provided by the invention has little change to the existing system, does not influence the compatibility of the system, and is simple and efficient to realize.
Drawings
Fig. 1 is a schematic diagram of an RRC reconfiguration procedure;
fig. 2 is a schematic diagram of a MAC control element format of an activated/deactivated SCell;
fig. 3 is a schematic diagram of cross eNB carrier aggregation;
fig. 4 is a general flow chart of an SCell configuration method in the present application;
fig. 5 is a general flow chart of an SCell activation method in the present application;
fig. 6 is a flowchart of a method for activating an SCell by a terminal in the present application;
fig. 7 is a schematic diagram of a terminal structure supporting cross eNB carrier aggregation in the present application;
fig. 8 is a flowchart of an SCell configuration method in the first embodiment of the present application;
fig. 9 is a flowchart of SCell activation and deactivation in embodiment two of the present application;
fig. 10 is a flowchart of SCell activation and deactivation in embodiment three of the present application.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The application is mainly directed to a system adopting cross-eNB carrier aggregation, and for a PCell eNB and an SCell eNB of carrier aggregation, if an X2 interface connection exists between the PCell eNB and the SCell eNB, a logic connection of the X2 interface is established between the PCell eNB and the SCell eNB, and then signaling interaction between the PCell eNB and the SCell eNB is carried out through the established logic connection. If the X2 interface connection is not available, a logical connection of an S1 interface is established between the PCell eNB and the MME, a logical connection of an S1 is established between the SCell eNB and the MME, and then signaling interaction between the PCell eNB and the SCell eNB is carried out through the two logical connections of the S1, and forwarding is carried out by the MME.
In order to achieve the purpose of the present invention, the present invention provides a method for configuring scells in a cross-eNB carrier aggregation system, as shown in fig. 4, the implementation steps of the method are as follows:
step 401: the PCell eNB sends an SCell configuration request message to the selected SCell eNB.
After the PCell eNB acquires the capability of the accessed UE, if the UE supports cross-eNB carrier aggregation, an appropriate SCell eNB may be selected according to service requirements, and an SCell configuration request may be sent thereto. Specifically, the appropriate SCell eNB may refer to an SCell eNB overlapping with the PCell coverage, where the information is obtained through a pre-system configuration or SON (Self-Organized Network) function of the eNB, and the eNB may save the physical ID of the SCell and static system configuration information of the SCell.
The SCell configuration request information should include an initial ID of the UE, which may be one or more of an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE. Meanwhile, the SCell configuration request information should include wireless capability information of the UE, where the wireless capability information of the UE is the basis for the SCell eNB to configure dedicated wireless parameters for the UE, allocate physical layer resources, and the SCell eNB scheduler to select uplink and downlink data and signaling transmission modes for the UE.
Step 402: the SCell eNB replies a SCell configuration request feedback message, which includes a new C-RNTI allocated by the SCell eNB to the UE, UE-specific physical layer configuration parameters, and the like.
The SCell eNB allocates a new C-RNTI for the UE, is used as a physical identifier of the UE in the SCell, and is used for decoding a downlink physical channel and scrambling an uplink physical channel of the UE in the SCell. The C-RNTI may be the same as or different from the C-RNTI of the UE in the PCell.
The SCell configuration request feedback message replied by the SCell eNB comprises the C-RNTI allocated by the SCell eNB for the UE and a special physical layer configuration parameter of the UE in the SCell, such as a PDSCH configuration parameter, a PUSCH configuration parameter, an uplink power control parameter and the like of the UE in the SCell.
Step 403: the Pcell eNB informs the UE of the information in the SCell configuration request feedback through an RRC reconfiguration message.
The configuration of the SCell is realized through an RRC reconfiguration process, and the RRC reconfiguration message carries information required by the configuration of the SCell. The information includes the index of the SCell, the physical layer configuration parameters of the SCell cell required by the UE, the UE-specific physical parameters configured by the SCell eNB for the UE in step S402, the C-RNTI of the UE in the SCell, and the like.
According to the embodiment of the invention, the above-mentioned common physical layer configuration parameters of the SCell cell should include RACH and PRACH configuration parameters in the SCell cell, so that the UE and the SCell eNB acquire uplink synchronization.
Step 404: and the UE executes the SCell configuration operation according to the received SCell configuration information.
The UE configures the SCell according to the received SCell configuration information, saves the general physical layer configuration parameters of the cell of the SCell and the specific physical layer configuration parameters of the UE, and saves the C-RNTI of the UE in the SCell.
In addition, the application also provides a method for activating the SCell in the cross-eNB carrier aggregation system, as shown in fig. 5, which comprises the following specific steps:
step 501: the PCell eNB sends an SCell activation request message to the SCell eNB.
The SCell activation request message should include a UE ID, which may be one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
In addition, if the SCell is activated because the SCell is required to support a new service request of the UE, or the SCell is required to share a PCell part of the service and RB (Radio Bearer) corresponding to the part of the service is not established in the SCell, that is, the RB corresponding to the service requirement for activating the SCell is not established in the SCell, the SCell activation request message should include information of RB establishment.
Step 502: the SCell eNB replies with an SCell activation response message informing the PCell eNB whether the activation of the SCell is allowed or not, and when allowed, step 503 is performed, otherwise step 504 is performed.
The content in the SCell activation response message may be "allow SCell activation" or "reject SCell activation", and if "reject SCell activation", the SCell activation response message may additionally include "reject cause" and/or "deferral time".
Step 503: if the content of the SCell activation request reply message received by the PCell eNB is "allow SCell activation", an SCell activation instruction is sent to the UE, and step 505 is performed.
If the content of the message in the SCell activation request response message is 'allowed SCell activation', and the message carries the special PRACH resource information allocated by the SCell eNB for the UE, the PCell eNB informs the UE to activate the SCell through the PDCCH Order. Specifically, the PDCCH Order carries dedicated PRACH resource information allocated by the SCell eNB to the UE and an identifier of the SCell, for example, an index of the SCell. After receiving the PDCCH Order, the UE performs uplink synchronization by utilizing the carried special PRACH resource.
If the content of the message in the SCell activation request response message is "allowed SCell activation", but the message does not contain the dedicated PRACH resource information allocated by the SCell eNB to the UE, the SCell activation mode is the same as that defined by the existing specification, that is, the UE is notified to activate the SCell through a bit corresponding to the SCell index in the MAC layer SCell activation/deactivation control unit.
In addition, for the SCell eNB, after determining that the SCell is allowed to activate, it needs to determine whether to allocate a dedicated PRACH resource for the UE, where in general, when determining that the UE and itself will be out of uplink, the UE may be allocated a dedicated PRACH resource and sent to the PCell eNB, and when determining that the UE and itself keep uplink synchronization, the UE is no longer allocated a dedicated PRACH resource. Of course, other possible manners of decision may be used, which are not limited in this application.
Step 504: if the content of the SCell activation request response message received by the PCell eNB is "reject SCell activation", the PCell eNB saves the "reject cause".
Further, if the message includes "deferral time", the PCell eNB should send the SCell eNB a next SCell activation request at least after "deferral time".
Step 505: and the UE starts communication with the SCell eNB according to the received SCell activation instruction.
If the SCell activation instruction is PDCCH Order, the SCell eNB has released the dedicated uplink resources of the UE, such as PUCCH and SRS resources, so that the UE needs to initiate a non-contention PRACH procedure through the dedicated PRACH resources indicated by PDCCH Order and the SCell eNB to acquire uplink synchronization, acquire PUCCH and SRS configuration, and perform the following processing to perform communication with the SCell eNB.
If the SCell activation instruction is sent through the activation/deactivation control unit of the MAC layer, the UE is required to further determine whether the UE and the SCell eNB are currently in an uplink synchronization state, if not, the UE obtains uplink synchronization through the PRACH process of the contention mode and the SCell eNB according to the RACH and PRACH configuration of the SCell, obtains PUCCH and SRS configuration, and then performs the following processing to perform communication with the SCell eNB; if so, the UE directly performs the following processing for communication with the SCell eNB.
Specifically, after the UE and the SCell eNB acquire uplink synchronization and acquire UE-specific PUCCH and SRS configurations, or the UE and a SCell receive an activation instruction sent by the activation/deactivation control unit of the MAC layer in the case of uplink synchronization, the UE behaves as follows:
listening for PDCCH on the SCell (C-RNTI decoding at SCell by UE);
-transmitting SRS on an SCell eNB according to its configuration;
reporting CQI/PMI/RI of the SCell (scrambling by the C-RNTI of the UE in the SCell), etc.
The above is the overall flow of the SCell configuration and activation method in the present application. In the above processing, when the PCell eNB notifies the UE of activation of the SCell by the PDCCH Order method, the UE-side processing is also different from the conventional processing method. Based on this, the present application also provides a method for activating an SCell by a UE, as shown in fig. 6, where the method flow includes:
in step 601, a UE supporting cross eNB carrier aggregation receives a notification of activation of scells sent by a PCell eNB through PDCCH Order.
The specific manner of determining that the received PDCCH Order is the notification of the SCell activation by the UE may be: after receiving PDCCH Order, UE checks Carrier Indicator field, and if Carrier Indicator field is the identification of SCell, it determines to activate the notification of SCell.
In step 602, the ue initiates a non-contention PRACH procedure through the dedicated PRACH resource indicated by the PDCCH Order, acquires uplink synchronization with the SCell eNB, acquires PUCCH and SRS configurations, and performs communication with the SCell eNB according to the PUCCH and SRS configurations.
Correspondingly, the present application also provides a terminal supporting cross eNB carrier aggregation, which can be used to implement the method shown in fig. 6. Fig. 7 is a schematic diagram of a terminal structure provided in the present application. As shown in fig. 7, the terminal includes: an interface unit and an activation communication unit.
And the interface unit is used for receiving the notification of activating the SCell sent by the PCell eNB through the PDCCH Order, notifying the activated communication unit and sending the special PRACH resource indicated by the PDCCH Order to the activated communication unit. And the activation communication unit is used for initiating a non-competitive PRACH process according to the special PRACH resource sent by the interface unit after receiving the notification of the interface unit, acquiring uplink synchronization with the SCell eNB, acquiring PUCCH and SRS configuration, and realizing communication with the SCell according to the acquired PUCCH and SRS configuration.
In order to further illustrate the present invention, the following describes the present invention with reference to specific embodiments.
Embodiment one:
application scenario one describes a procedure in which a PCell eNB configures an SCell for a UE, as shown in fig. 8, and the specific steps are as follows:
step 801: the PCell eNB sends an SCell configuration request message to the candidate SCell enbs.
This process occurs after the PCell eNB acquires the radio capability of the UE, and after the PCell eNB acquires the capability of the accessed UE, if the UE supports cross-eNB carrier aggregation, an appropriate SCell eNB is selected and sent an SCell configuration request.
The SCell configuration request information includes an initial ID of the UE, and the initial ID of the UE may be one or more of an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value used by the UE for contention resolution. Meanwhile, the SCell configuration request information can also contain wireless capability information of the UE, wherein the wireless capability information of the UE is the basis for the SCell eNB to configure special wireless parameters for the UE, allocate physical layer resources and the SCell eNB scheduler to select uplink and downlink data and signaling transmission modes for the UE.
Step 802: and the eNB to which the SCell belongs allocates a new C-RNTI for the UE according to the received information of the SCell configuration request, and configures the special physical parameters of the UE.
The SCell allocates a new C-RNTI for the UE, which is used as the physical identifier of the UE in the SCell, and is used for decoding the downlink physical channel and scrambling the uplink physical channel of the UE in the SCell. The C-RNTI may be the same as or different from the C-RNTI of the UE in the PCell.
The UE-specific physical parameters may include specific PDSCH configuration parameters of the UE within the SCell, specific PUSCH configuration parameters, specific uplink power control parameters, and the like.
Step 803: the SCell eNB sends an SCell configuration reply message to the PCell eNB.
The SCell configuration response message replied by the SCell eNB should include the C-RNTI allocated by the SCell eNB to the UE and the dedicated physical layer configuration parameters of the UE in the SCell.
Step 804: the PCell eNB informs the UE of the information in the SCell configuration reply through an RRC connection reconfiguration message.
The configuration of the SCell is realized through an RRC reconfiguration process, and the RRC reconfiguration message carries information required by the configuration of the SCell. The information includes the index of the SCell, the physical layer configuration parameters of the SCell cell required by the UE, the C-RNTI allocated by the SCell eNB to the UE, and the like.
In this embodiment, the above-mentioned common physical layer configuration parameters of the SCell cell include RACH and PRACH configuration parameters in the SCell cell, which are used for the UE and the SCell eNB to acquire uplink synchronization.
Step 805: and the UE configures the SCell according to the received SCell configuration information.
The UE configures the SCell according to the received SCell configuration information, saves the general physical layer configuration parameters of the cell of the SCell and the specific physical layer configuration parameters of the UE, and saves the C-RNTI of the UE in the SCell.
Step 806: after the UE completes the SCell configuration, the UE replies an RRC connection reconfiguration completion message to the PCell eNB, and the SCell configuration process is completed.
Embodiment two:
application scenario two describes the procedure of the PCell eNB activating and deactivating scells for UEs. In the process, the PCell eNB requests the SCell eNB to support one service of the UE, the SCell eNB receives the SCell activation request and allocates special PRACH resources for the UE; the UE acquires uplink synchronization through the PRACH process of the non-contention mode and the SCelleNB, and successfully activates the SCell. After the service is completed, the UE deactivates the SCell. The process is shown as 9, and comprises the following specific steps:
step 901: the PCell eNB sends an SCell activation request message to the SCell eNB.
The SCell activation request message should include a UE ID, which may be one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
In addition, the SCell activation request message should include information of RB establishment.
Step 902: the PCell eNB informs the UE to establish the RB through an RRC connection reconfiguration message.
This procedure is the same as defined by the existing protocol. The order of steps 901 and 902 depends on the implementation method of the different enbs.
Step 903: the SCell eNB allocates dedicated PRACH resources for the UE and establishes corresponding RBs.
Step 904: and after the UE successfully establishes the RB, replying an RRC connection reconfiguration completion message.
This procedure is the same as defined by the existing protocol. The order of steps 904 and 903 depends on the network environment and the processing power of the UE.
Step 905: the SCell eNB replies an SCell activation request response message to the PCell eNB.
In this scenario, the SCell activation request response message should at least include the UE ID and the UE-specific PRACH resource information corresponding to the SCell activation request message, and indicate "allow SCell activation" and RB successfully established.
The order of steps 904 and 905 depends on the network environment, the processing power of the UE and the processing power of the eNB.
Step 906: after receiving the response message of the SCell activation request, the PCell eNB triggers the UE to initiate a non-competitive random access process in the SCell through the PDCCH Order.
The PDCCH Order carries dedicated RACH resource information allocated by the SCell eNB to the UE, and a Carrier Indicator field of the PDCCH Order is set as an index corresponding to the SCell, and is used for indicating an activated SCell.
Step 907: the UE initiates a non-competing PRACH procedure within the SCell over the dedicated RACH resources indicated by PDCCH Order, i.e. transmits the PRACH sequence indicated by pdcchshop on the PRACH channel selected according to PDCCH Order indication.
Step 908: and the UE replies ACK aiming at the PDCCHOrder on the corresponding uplink subframe according to the HARQ timing relation so as to inform the PCell eNB that the sent PDCCH Order has been successfully received.
The sequencing of steps 907 and 908 depends on the PRACH time position selected by the UE and the time sequence of the uplink subframe position of the feedback ACK determined by the UE according to the HARQ timing relationship.
Step 909: after the SCell eNB successfully detects the PRACH sent by the UE, the RAR is returned to the RA-RNTI determined by the PRACH.
Step 910: after the UE successfully detects the RAR for the PRACH of step 905 within a specified time window, the PRACH procedure is considered successful.
The RAR should include an uplink advance and initial uplink scheduling grant information. After the PRACH is successful, the UE sends an RNTI for scrambling uplink signals and decoding downlink signals in the SCell according to the uplink advance indicated by the RAR and the uplink scheduling authorization as a C-RNTI allocated to the UE by the SCell eNB in the SCell configuration process.
The processing of PRACH by SCell eNB in step 909 and the processing of RAR by UE in step 910 are the same as the existing processing methods.
Step 911: after receiving the uplink signal sent by the UE for the first time, the SCell eNB sends a SCell activation success notification to the PCell eNB.
Step 912: and if the data transmission in the SCell is ended, the SCell eNB sends a service ending instruction to the PCell eNB.
Step 913: the PCell eNB sends an SCell deactivation instruction informing the UE to deactivate the designated SCell.
The behavior of the UE after SCell deactivation is the same as that defined by the existing protocol, as described in the background.
Step 914: after receiving the SCell deactivation command, the UE replies an ACK for the SCell deactivation command in a corresponding uplink subframe according to the HARQ timing relationship of the PCell.
Steps 913 and 914 are optional steps, and deactivation of the SCell may be triggered by an SCell deactivation timer within the UE for the SCell.
Step 915: after the SCell is deactivated, the UE should keep running the uplink synchronization timer for the SCell until the uplink synchronization timer expires.
Embodiment III:
application scenario three describes the procedure of the PCell eNB activating and deactivating scells for a UE. In the process, the PCell eNB requests the SCell eNB to support one service of the UE, the SCell eNB receives the SCell activation request, but does not allocate special PRACH resources for the UE; the PCell eNB informs the UE to activate the SCell through the MAC control unit; after receiving the SCell activation instruction, the UE determines a method for activating the SCell according to the current uplink synchronization status of the SCell and the SCell. After the service is completed, the UE deactivates the SCell. The process is shown in fig. 10, and the specific steps are as follows:
step 1001: the PCell eNB sends an SCell activation request message to the SCell eNB.
The SCell activation request message should include a UE ID, which may be one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
In addition, the SCell activation request message should include information of RB establishment.
Step 1002: the PCell eNB informs the UE to build the RB through an RRC connection reconfiguration message.
This procedure is the same as defined by the existing protocol. The order of steps 1001 and 1002 depends on the implementation method of the different enbs.
Step 1003: the SCell eNB establishes a corresponding RB.
Step 1004: and after the UE successfully establishes the RB, replying an RRC connection reconfiguration completion message.
This procedure is the same as defined by the existing protocol. The order of steps 1004 and 1003 depends on the network environment and the processing power of the UE.
Step 1005: after the operation is successful, the SCell eNB replies an SCell activation request response message to the PCell eNB.
In this scenario, the SCell activation request response message should at least include the corresponding UE ID in the SCell activation request message, and indicate "allow SCell activation" and RB successfully established.
The order of steps 1004 and 1005 depends on the network environment, the processing power of the UE and the processing power of the eNB.
Step 1006: after receiving the SCell activation request response message, the PCell eNB informs the UE of activating the SCell through the MAC layer SCell activation/deactivation control unit, and the specific method is as described in the background art.
Step 1007: if the UE and the SCell are in an uplink out-of-step state at this time, if an uplink synchronization timer for the SCell maintained inside the UE has timed out, the UE initiates a PRACH procedure of a contention mode on the SCell according to RACH and PRACH configuration of the SCell.
After receiving the SCell activation command, the UE should immediately start detecting PDCCH in the SCell.
Step 1008: after the UE sends the PRACH sequence, according to the HARQ timing relationship, the UE replies an ACK for the MAC layer SCell activation/deactivation control unit on the corresponding uplink subframe.
The sequence of steps 1007 and 1008 depends on the PRACH time position selected by the UE and the time sequence of the uplink subframe position of the feedback ACK determined by the UE according to the HARQ timing relationship.
Step 1009: if the UE and the SCell are in an uplink out-of-step state at this time, after the SCell eNB successfully detects the PRACH sent by the UE, the RAR is returned to the RA-RNTI determined by the PRACH.
Steps 1007 and 1009 occur only when the UE and the SCell are in an uplink out-of-step state. If the UE receives PDCCH Order for the SCell before receiving RAR for PRACH in step 1007, where dedicated PRACH resources are indicated, the UE should end the PRACH procedure initiated in step 1007 and then initiate a non-competing PRACH procedure according to the indication of PDCCH Order, as in steps 1007 and 1009 in application scenario two.
Step 1010: and the UE transmits an uplink signal according to the uplink time advance in the SCell.
If the UE receives the SCell activation instruction and the SCell is in an uplink out-of-step state, after receiving the RAR in step 1009, the UE sends an uplink signal in the SCell according to the uplink advance indicated by the RAR and the initial uplink scheduling grant; otherwise, after receiving the SCell activation instruction, the UE starts to send uplink signals in the first uplink subframe meeting the configuration requirement according to the configuration of the SRS and the PUCCH in the SCell by the UE.
Step 1011: after receiving the uplink signal sent by the UE for the first time, the SCell eNB sends a SCell activation success notification to the PCell eNB.
Step 1012: and if the data transmission in the SCell is ended, the SCell eNB sends a service ending instruction to the PCell eNB.
Step 1013: the PCell eNB sends an SCell deactivation instruction informing the UE to deactivate the designated SCell.
The behavior of the UE after SCell deactivation is the same as that defined by the existing protocol, as described in the background.
Step 1014: after receiving the SCell deactivation command, the UE replies an ACK for the SCell deactivation command in a corresponding uplink subframe according to the HARQ timing relationship of the PCell.
Steps 1013 and 1014 are optional steps, and the deactivation of the SCell may be triggered by an SCell deactivation timer for the SCell within the UE.
Step 1015: after the SCell is deactivated, the UE should keep running the uplink synchronization timer for the SCell until the uplink synchronization timer expires.
The method is a specific implementation of the SCell configuration and activation method in the cross eNB carrier aggregation system, can conveniently realize the configuration and activation of the SCell, and ensures that the system is minimally changed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (12)
1. A terminal UE supporting cross-base station carrier aggregation, comprising:
an interface unit, configured to receive an RRC reconfiguration message sent by a base station where a primary cell PCell is located, where the RRC reconfiguration message includes a UE-specific physical layer configuration parameter and a cell radio network temporary identifier C-RNTI in a secondary cell SCell; wherein, the UE-specific physical layer configuration parameter and the C-RNTI are in an SCell configuration request feedback message received by the base station where the PCell is located from the base station where the SCell is located;
and the Scell configuration unit is used for configuring the SCell according to the UE special physical layer configuration parameter, the C-RNTI, the identification of the SCell and the SCell general physical layer configuration parameter required by the UE.
2. The UE of claim 1, further comprising an identification of an SCell and SCell common physical layer configuration parameters required by the UE in the RRC reconfiguration message.
3. The UE of claim 1 or 2, wherein the UE-specific physical layer configuration parameters comprise: a Physical Downlink Shared Channel (PDSCH) configuration parameter, a Physical Uplink Shared Channel (PUSCH) configuration parameter and an uplink power control parameter of the UE in the SCell;
and/or, the configuration parameters of the general physical layer of the SCell required by the UE comprise the configuration parameters of a random access channel RACH and a physical random access channel PRACH in the SCell cell;
and/or the SCell configuration request message comprises an initial identification ID of the UE, wherein the initial ID of the UE comprises one or more of a short temporary user identification S-TMSI of the UE, a C-RNTI of the UE in the PCell and a random value for contention resolution of the UE.
4. A base station supporting cross-base station carrier aggregation, comprising:
a sending unit, configured to send an Scell activation request message to a base station where a secondary cell Scell is located, where the Scell activation request message includes an identifier of user equipment UE;
a receiving unit, configured to receive an Scell activation request response message fed back by a base station where the Scell is located, and notify, in the Scell activation request response message, whether a primary cell PCell allows activation of the Scell;
and the notification unit is used for notifying the UE to activate the SCell when the activation of the SCell is allowed, so that the UE activates the SCell according to the notification.
5. The base station according to claim 4, wherein when the PCell is informed in the SCell activation request response message that the SCell is not allowed to activate the SCell, the SCell activation request response message further includes a reason and/or a deferral time for rejecting SCell activation.
6. The base station of claim 5, wherein when the SCell activation request response message further includes a reason for rejecting SCell activation, the base station further includes: a unit for saving the cause.
7. The base station of claim 4, wherein before the sending unit sends the SCell activation request message, if a radio bearer RB corresponding to a service requirement for activating the SCell is not yet established in the SCell, the SCell activation request message further includes information of RB establishment.
8. The base station according to any of the claims 4 to 7, characterized in that the identification of the UE comprises: one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
9. A base station supporting cross-base station carrier aggregation, comprising:
a receiving unit, configured to receive a secondary cell SCell activation request message sent by a base station where a primary cell Pcell is located, where the secondary cell SCell activation request message includes an identifier of user equipment UE;
and the sending unit is used for feeding back an SCell activation request response message to the base station where the Pcell is located and informing whether the PCell allows activation of the SCell.
10. The base station according to claim 9, wherein the SCell activation request response message further comprises a reason for rejecting SCell activation and/or a deferral time when the sending unit informs that the PCell does not allow activation of the SCell.
11. The base station of claim 9, wherein after the data transmission between the UE and the base station where the Scell is located is finished, the sending unit is further configured to notify the base station where the Pcell is located of the end of service of the base station where the Pcell is located, so that the base station where the Pcell is located notifies the UE to deactivate the Scell.
12. The base station according to any of the claims 9 to 11, characterized in that the identification of the UE comprises: one or more of a C-RNTI of the UE in the SCell, an S-TMSI of the UE, a C-RNTI of the UE in the PCell, and a random value for contention resolution by the UE.
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| CN105532024B (en) * | 2014-08-16 | 2019-05-07 | 华为技术有限公司 | A kind of multi channel simultaneous transmission method of uplink and base station and user equipment |
| CN106797536B (en) * | 2014-10-07 | 2020-11-10 | 瑞典爱立信有限公司 | Mobility in dense networks |
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| CN104735703B (en) * | 2015-04-15 | 2018-11-27 | 北京邮电大学 | A kind of master base station, user terminal and communication system |
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| CN108023716A (en) * | 2016-11-04 | 2018-05-11 | 大唐移动通信设备有限公司 | A kind of carrier aggregation transmission method and device |
| CN108616958B (en) * | 2016-12-30 | 2021-01-26 | 中国电信股份有限公司 | Method, terminal, base station and communication system for activating different-system SeNB |
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