CN102300203B - Random access triggering and initiating method and system and device - Google Patents
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Abstract
The invention discloses a random access triggering and initiating method and a system and a device, which relate to the technical field of the wireless communication, and are used for reducing the signaling overhead of a physical downlink control channel (PDCCH). A subdistrict configuration signaling is transmitted from a basic station to a terminal, and relevant random access parameters are carried in the subdistrict configuration signaling; activation/deactivation signaling of a subdistrict which is configured according to the subdistrict configuration signaling is transmitted from the basic station to the terminal so as to indicate the terminal to initiate the random access process according to the random access parameters. Due to the adoption of the method, the system and the device, the signaling overhead of the PDCCH can be reduced.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method, a system, and an apparatus for triggering and initiating random access.
Background
The peak rate of an LTE-Advanced (LTE-A) system is greatly improved compared with that of a LTE system, and the requirements of 1Gbps downlink and 500Mbps uplink are met. Meanwhile, the LTE-A system is well compatible with the LTE system, and the maximum bandwidth of the LTE system is 20 MHz. Based on the needs of improving peak rate, being compatible with the LTE system, and fully utilizing frequency resources, the LTE-a system introduces a Carrier Aggregation (CA) technology.
The carrier aggregation technology means that a terminal can simultaneously aggregate one or more cells, the cells can simultaneously work, and the number of the cells aggregated by the terminal is configured by a base station according to the service requirement of the terminal. The cell configured for a terminal is divided into a primary cell and a secondary cell, wherein:
primary Cell (PCell): in the case of carrier aggregation, generally, a terminal only has one cell as a primary cell, and the terminal establishes Radio Resource Control (RRC) connection with a base station on the cell, where the cell is responsible for carrying transmission of uplink control information of all carriers of the terminal.
Secondary Cell (SCell,): configured by the base station, in the case of carrier aggregation, the secondary cell is mainly used as a resource for transmitting the service data of the user. The secondary cells configured by the base station are in a deactivated state by default, that is, uplink/downlink data transmission cannot be performed, and if uplink/downlink data transmission is to be performed, the cells need to be activated first.
In a carrier aggregation scenario, an activation/deactivation mechanism is introduced for better power saving of a terminal. The activation/deactivation in the LTE-a system is performed for a single cell, and there are two specific embodiments: explicit and implicit ways. It is noted that the implicit approach only applies to deactivation operations.
An activation/deactivation mechanism is displayed, that is, the base station controls the activation state of the terminal aggregated cells by transmitting an activation/deactivation Medium Access Control (MAC) Control Element (CE). The format of activating/deactivating the MAC CE is shown in fig. 1, where the length of the MAC CE is 8 bits (bit), and each bit corresponds to a cell, that is:
the rightmost bit corresponds to the PCell, and the PCell can never be deactivated, so that the position is the R bit, and the default is 0;
the other bits correspond to an SCell, i.e. CiCorresponding to SCell numbered i. When C is presentiWhen "1" is taken, it indicates that the SCell is activated, when CiTaking "0" indicates that the SCell is deactivated.
Implicit deactivation mechanism, i.e. a method of implicit deactivation by introducing a deactivation timer. The deactivation timer is based on cell maintenance, i.e.:
starting a deactivation timer of the cell when the terminal receives an activation signaling for activating the cell;
during the operation of the deactivation timer, the deactivation timer of the cell is restarted once the terminal receives the scheduling signaling of uplink or downlink transmission of the cell. A scheduling signaling for uplink or downlink data transmission is carried through a Physical Control Channel (PDCCH);
and the terminal deactivates the cell if the deactivation timer is overtime.
The random access procedure of the LTE-a system is divided into a contention random access procedure and a non-contention random access procedure, and the difference between the contention random access procedure and the non-contention random access procedure is whether a base station allocates a dedicated random access preamble (preamble) to the base station. The procedure of contention random access is shown in fig. 2, and specifically as follows:
message (Msg) 1: a terminal (UE) selects a Random Access preamble and a Physical Random Access Channel (PRACH) resource, and transmits the selected Random Access preamble to a base station by utilizing the PRACH resource;
msg 2: the base station receives the Random Access preamble, calculates an uplink Timing Advance (TA), and sends a Random Access Response (RAR) message to the UE, where the RAR message at least includes the uplink timing advance information and uplink scheduling information (UL grant) for Msg 3. The random access response message is transmitted through a Downlink shared channel (DL-SCH);
msg 3: the method comprises the steps that UE sends scheduling Uplink transmission information to a base station for the first time, the information carries identification information of the UE, and the information is transmitted through an Uplink Shared Channel (UL-SCH);
msg 4: the base station sends a contention resolution message to the UE, which is transmitted over the DL-SCH. And the terminal judges whether the competition is successful according to the UE identification sent by the Msg3 and the information received by the Msg 4.
Multi-TA introduction to LTE-A System
In order to ensure that uplink data transmitted on different UEs or different cells aggregated by the same UE can reach the base station at the same time, the terminal needs to make some adjustments to the uplink transmission time, where the adjustment amount is TA.
In LTE release 10(R10) and previous releases, one terminal uplinks only one carrier, so only one uplink timing advance needs to be maintained, while for releases after R10, the number of uplink carriers aggregated by the terminal may be more than 1 according to the carrier aggregation scenario defined by 3GPP, so in order to ensure that signals transmitted by different uplink carriers can reach the base station at the same time, it may need to consider the case where different uplink timing advances, i.e. multiple-TA (Multi-TA), are used by different carriers. If a plurality of cells aggregated by a terminal have a part of cells with the same TA, the cells with the same TA may be divided into a group (group), which is called a TA group, in which case the timing advance may be maintained based on the TA group.
Releases following LTE-AR10 may need to consider the multi-TA scenario as follows:
firstly, uplink carriers aggregated by a terminal belong to different frequency bands (bands);
secondly, the nodes of the paths of the signals of the uplink transmission of the terminal aggregated cells to the base station are different, such as some signals are relayed and some signals are not passed through.
In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:
for a terminal supporting carrier aggregation, a base station dynamically adjusts the number of configured and activated carriers according to factors such as the traffic of the terminal, but after a carrier is activated in Multi-TA, if the carrier is in an out-of-step state, the carrier needs to be uplink synchronized first, and then uplink data transmission can be performed on the carrier.
Disclosure of Invention
The embodiment of the invention provides a method, a system and a device for triggering and initiating random access, which are used for reducing the signaling overhead of a PDCCH (physical downlink control channel).
A method of triggering random access, the method comprising:
a base station sends a cell configuration signaling to a terminal, wherein the cell configuration signaling carries random access related parameters;
and the base station sends activation/deactivation signaling of the cell configured by the cell configuration signaling to the terminal so as to instruct the terminal to initiate a random access process according to the random access related parameters.
A method of triggering random access, the method comprising:
a terminal receives a cell configuration signaling sent by a base station, wherein the cell configuration signaling carries random access related parameters;
and the terminal receives an activation/deactivation signaling of the cell configured by the cell configuration signaling and sent by the base station, and initiates a random access process according to the random access related parameters to acquire an uplink timing advance TA of the cell activated by the activation/deactivation signaling.
An apparatus for triggering random access, the apparatus comprising:
a configuration unit, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter;
and the activation unit is used for sending activation/deactivation signaling of the cell configured by the cell configuration signaling to the terminal so as to instruct the terminal to initiate a random access process according to the random access related parameters.
An apparatus for initiating random access, the apparatus comprising:
a receiving unit, configured to receive a cell configuration signaling sent by a base station, where the cell configuration signaling carries a random access related parameter;
an access unit, configured to receive an activation/deactivation signaling of a cell configured for the cell configuration signaling sent by a base station; and initiating a random access process according to the random access related parameters to acquire an uplink timing advance TA of the cell activated by the activation/deactivation signaling.
A wireless communication system, the system comprising:
a base station, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter; sending activation/deactivation signaling of the cell configured by the cell configuration signaling to a terminal so as to instruct the terminal to initiate a random access process according to the random access related parameters;
the terminal is used for receiving the cell configuration signaling sent by the base station; and receiving an activation/deactivation signaling of the cell configured by the cell configuration signaling, which is sent by a base station, and initiating a random access process according to the random access related parameters to acquire an uplink timing advance TA of the cell activated by the activation/deactivation signaling.
In the scheme provided by the embodiment of the invention, the base station carries the random access related parameters in the sent cell configuration signaling, and then sends the activation/deactivation signaling to the terminal to indicate the terminal to initiate the random access process according to the random access related parameters. Therefore, in the scheme, the base station does not need to trigger the terminal to initiate a random access process through the PDCCH, and the expense of the PDCCH can be effectively reduced.
Drawings
FIG. 1 is a diagram illustrating activation/deactivation of MAC CEs in the prior art;
FIG. 2 is a diagram illustrating a contention random access procedure in the prior art;
FIG. 3 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another method provided by the embodiment of the present invention;
FIG. 5 is a diagram of a MAC CE in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a system according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another apparatus according to an embodiment of the present invention.
Detailed Description
In order to reduce signaling overhead of a PDCCH, an embodiment of the present invention provides a method for triggering random access, where a base station carries random access related parameters in a cell configuration signaling sent by the base station, and then sends an activation/deactivation signaling to a terminal to instruct the terminal to initiate a random access process according to the random access related parameters.
Referring to fig. 3, the method for triggering random access provided in the embodiment of the present invention includes the following steps:
step 30: a base station sends a cell configuration signaling to a terminal, wherein the cell configuration signaling carries random access related parameters; the cell configuration signaling may be RRC signaling.
Step 31: and the base station sends activation/deactivation signaling of the cell configured by the cell configuration signaling to the terminal so as to instruct the terminal to initiate a random access process according to the random access related parameters.
In step 30, the cell configuration signaling carries random access related parameters of all configured cells; or, the cell configuration signaling carries the configured random access related parameters of the specific cell for initiating random access in the TA group to which each cell belongs. Any cell in the TA group may be pre-set as a specific cell in the TA group for initiating random access.
Preferably, the activation/deactivation signaling also carries indication information of a cell that needs to initiate random access.
Preferably, when the cell configuration signaling carries the configured random access related parameters of the specific cell for initiating the random access in the TA group to which each cell belongs, if the specific cell for initiating the random access is in an inactive state, the activated cell indicated by the activation/deactivation signaling includes the specific cell for initiating the random access.
In the method, the random access related parameter may include: PRACH configuration information, random access preamble related information, and the like. The terminal can determine the position of the PRACH resource used for initiating the random access process according to the PRACH configuration information, and determine the transmitted preamble according to the related information of the random access preamble. The activation/deactivation signaling may be activation/deactivation of MAC CE, etc.
Referring to fig. 4, an embodiment of the present invention further provides a method for triggering random access, including the following steps:
step 40: a terminal receives a cell configuration signaling sent by a base station, wherein the cell configuration signaling carries random access related parameters;
step 41: and the terminal receives an activation/deactivation signaling of the cell configured by the cell configuration signaling and sent by the base station, and initiates a random access process according to the random access related parameters to acquire an uplink TA of the cell activated by the activation/deactivation signaling.
As an implementation manner, the cell configuration signaling carries random access related parameters of all configured cells; correspondingly, in step 41, the terminal initiates a random access process according to the random access related parameter to obtain the uplink TA of the cell activated by the activation/deactivation signaling, which may be specifically implemented as follows:
the terminal determines the cell activated by the base station or newly activated according to the activation/deactivation signaling;
and the terminal initiates a random access process on the cell according to the random access relevant parameters of the cell for each determined cell so as to acquire an uplink TA of the cell and uses the uplink TA to perform uplink transmission in the cell.
As another embodiment, the cell configuration signaling carries random access related parameters of all configured cells; correspondingly, in step 41, the terminal initiates a random access process according to the random access related parameter to obtain the uplink TA of the cell activated by the activation/deactivation signaling, which may be specifically implemented as follows:
the terminal determines a cell (called an activated cell) activated or newly activated by the base station according to the activation/deactivation signaling;
the terminal judges whether the TA group to which the cell belongs contains the cell which establishes the uplink synchronization or not for each determined cell;
for each cell (that is, the active cell of the cell for which uplink synchronization is established is not included in the TA group to which the terminal belongs), the terminal initiates a random access process in the cell according to the random access related parameters of the cell to acquire an uplink TA of the cell, and performs uplink transmission in the cell by using the uplink TA; or, the terminal selects a cell activated by the base station or newly activated from the TA group for the TA group to which each cell judged as negative belongs, initiates a random access process in the selected cell according to the random access related parameters of the selected cell to acquire an uplink TA of the TA group to which the selected cell belongs, and performs uplink data transmission in the selected cell and other cells in the TA group to which the selected cell belongs by using the uplink TA.
Specifically, the terminal selects a cell activated by the base station or newly activated from the TA group, and the specific implementation may be as follows:
the terminal selects a base station activated or newly activated cell from the TA group according to a preset random access cell selection rule, such as a random selection rule; or,
and the terminal selects a cell indicated by the random access cell indication information from the TA group according to the random access cell indication information carried in the activation/deactivation signaling.
Preferably, for each cell determined to be the cell (that is, the active cell including the cell for which the uplink synchronization has been established in the TA group to which the terminal belongs), the terminal may obtain the uplink TA of the cell for which the uplink synchronization has been established in the TA group to which the terminal belongs, and use the TA as the uplink TA of the cell determined to be the cell for which the terminal is determined to be the cell for which the.
As a third implementation manner, the cell configuration signaling carries configured random access related parameters of a specific cell for initiating random access in a TA group to which each cell belongs; correspondingly, in step 41, the terminal initiates a random access process according to the random access related parameter to obtain the uplink TA of the cell activated by the activation/deactivation signaling, which may be specifically implemented as follows:
the terminal determines the cell activated by the base station or newly activated according to the activation/deactivation signaling;
the terminal determines whether the specific cell for initiating the random access in the TA group has established uplink synchronization for the determined TA group to which each cell belongs, and initiates a random access process in the specific cell according to the random access related parameters of the specific cell to acquire the uplink TA of the specific cell and uses the uplink TA to perform uplink transmission in the cell in the TA group to which the specific cell belongs when the specific cell does not establish the uplink synchronization.
Preferably, when it is determined that the specific cell for initiating the random access in the TA group has established uplink synchronization, the terminal may acquire the uplink TA of the specific cell, and use the TA as the uplink TA of the cell activated by the base station or newly activated by the base station in the TA group to which the specific cell belongs, that is, use the TA to perform uplink transmission in other cells in the TA group to which the specific cell belongs.
Preferably, before initiating the random access procedure in the specific cell for initiating the random access, the terminal activates the specific cell if determining that the specific cell is in the inactive state.
In the method, for a Frequency Division Duplex (FDD) system, a terminal initiates a random access process at a subframe n +8 or a subframe after the subframe n + 8; or, for a Time Division Duplex (TDD) system, the terminal initiates a random access process on an uplink subframe n + K or an uplink subframe after the subframe n + K; the n is a subframe number when the activation/deactivation signaling is received; the value of K is determined according to a system frame structure and a hybrid automatic repeat request round trip time (HARQ RTT), which is described in the protocol TS 36.213.
The random access related parameters include: PRACH configuration information and random access preamble related information; the activation/deactivation signaling is: MAC CE is activated/deactivated.
The present invention is described in detail below:
the invention provides a method for triggering a terminal to carry out random access by utilizing a carrier activation/deactivation signaling, namely, once the terminal receives an activation/deactivation MAC CE sent by a base station, whether random access needs to be initiated on a corresponding carrier is judged according to the MAC CE so as to obtain the timing advance on the newly activated carrier.
Specifically, there may be several ways as follows:
the method comprises the following steps:
a base station side:
when configuring an aggregated cell set for a terminal through RRC signaling, a base station needs to carry random access related parameters (including PRACH configuration information and some common configuration information of random access, such as preamble information, etc.) of all configured cells;
a terminal side:
once the carrier activation/deactivation MAC CE sent by the base station is received, the base station is judged which cells are activated or newly activated according to the MAC CE, and random access is initiated on the cells in a serial or parallel mode, so that uplink synchronization is established according to the obtained uplink TA.
The method 2 comprises the following steps:
a base station side:
when configuring an aggregated cell set for a terminal through RRC signaling, a base station needs to carry random access related parameters (including PRACH configuration information and some common configuration information of random access, such as preamble information, etc.) of all configured cells;
a terminal side:
once the carrier activation/deactivation MAC CE sent by the base station is received, the terminal determines, after the carrier activation/deactivation MAC CE activates or newly activates which cells, whether uplink synchronization has been established for any cell in the TA group to which the cells belong may be determined, if so, the same TA as the TA used for the cell in the TA group for which uplink synchronization has been established may be used, and if not, it is determined that the activated or newly activated cells belong to several TA groups, and only one cell needs to be selected to initiate random access in one TA group.
For method 2, the carrier activation/deactivation MAC CE sent by the base station may be extended to carry a cell indication to indicate on which cell random access needs to be initiated.
The extended MAC CE format may be as shown in fig. 5, and it is noted that in order to distinguish the MAC CE from the previous MAC CE format of R10, a new Logical Channel Identity (LCID) needs to be introduced for it. The first byte in the extended MAC CE represents activated/deactivated cell information, which is the same as byte 1 in fig. 1; the second byte represents cell indication information, for example, if Ci in the second byte takes 1, it indicates that random access is initiated on scelll.
The method 3 comprises the following steps:
a base station side:
when a base station configures an aggregated cell set for a terminal through RRC signaling, only one cell is selected as a cell initiating random access for each TA group, which is called an RACH cell for short.
Further, the base station should activate the RACH cell of the TA group first, once the base station activates the cell in the TA group.
A terminal side:
once the terminal receives the carrier activation/deactivation MAC CE sent by the base station, the terminal judges which cells are activated or newly activated by the base station according to the MAC CE, and judges whether the uplink synchronization is established in the RACH cells in the TA group where the cells are located, if the uplink synchronization is established, the newly activated cells in the TA group do not need to initiate random access again, the terminal directly uses the TA same as the RACH cells in the TA group to which the terminal belongs to carry out uplink transmission, otherwise, the terminal initiates random access on the RACH cells of the TA group to which the cell belongs. The random access procedure of the RACH cells in different TA groups may be serial or parallel.
In the method, the parallel initiating of random access means that random access is initiated on a plurality of cells at the same time, and the serial initiating of random access means that random access is initiated in the next cell after the random access in one cell is completed. If the random access is performed in a serial manner, the order in which the cells initiate the random access depends on the UE implementation, for example, according to the ascending order or the descending order of the cell numbers. In the patent, each message in the random access process can be transmitted on the same cell without cross-carrier scheduling.
In the above method, the activation timing relationship needs to be considered at the random access initiation time, that is:
for an FDD system, if the terminal receives an activation/deactivation signaling in subframe n, random access can be initiated at the earliest time in subframe n + 8;
for a TDD system, if a terminal receives an activation/deactivation signaling in a subframe n, then random access may be initiated in an uplink subframe numbered n + K earliest, and K determines a value according to a frame structure of the TDD system.
The examples of the invention are as follows:
the base station is configured with at most five aggregation cells, namely a cell 1, a cell 2, a cell 3, a cell 4 and a cell 5. Wherein, the cell 1 and the cell 2 belong to the same TA group, which is marked as TA group 1; the cell 3 and the cell 4 belong to a TA group, which is marked as TA group 2; the cell 5 alone belongs to a TA group, denoted TA group 3.
Example one (corresponding to method 1):
step 1: a terminal accesses a base station on a cell 1, wherein the cell 1 is called a PCell;
step 2: the base station determines that 3 cells, namely cell 2, cell 3 and cell 4, are required to be newly added to the terminal according to the data volume of the terminal, and then the base station configures the cells to the terminal through RRC signaling, wherein the RRC signaling needs to contain random access related information on each newly configured cell, such as information of PRACH configuration, preamble configuration and the like.
And step 3: since the configured cells are deactivated by default, the base station needs to activate these cells by sending activation/deactivation MAC CEs to the UE before data transmission on these cells.
And 4, step 4: the terminal receives the activated/deactivated MAC CE, judges which cells are activated or newly activated according to the MAC CE, and for the activated or newly activated cells, the terminal needs to initiate contention random access to acquire uplink timing advance on the newly activated cells. The random access procedure on multiple active or newly active cells may be performed in parallel or in series.
And 5: after the terminal acquires the uplink timing advance on the activated or newly activated cell, the corresponding uplink timing advance can be used for corresponding uplink data transmission.
Example two (corresponding to method 2):
step 1: a terminal accesses a base station on a cell 1, wherein the cell 1 is called a PCell;
step 2: the base station determines that 3 cells, namely cell 2, cell 3 and cell 4, are required to be newly added to the terminal according to the data volume of the terminal, and then the base station configures the cells to the terminal through RRC signaling, wherein the RRC signaling needs to contain random access related information on each newly configured cell, such as information of PRACH configuration, preamble configuration and the like.
And step 3: since the configured cells are deactivated by default, the base station needs to activate these cells by sending activation/deactivation MAC CEs to the UE before data transmission on these cells.
Optionally, the activation/deactivation MAC CE may also carry cell indication information to indicate those cells need to initiate random access.
And 4, step 4: the terminal receives the activation/deactivation MAC CE, and judges whether to trigger random access according to whether a cell establishes uplink synchronization in a TAgroup to which a newly activated cell belongs, for example, for a newly activated cell 2, because the cell belongs to the same TA as the cell 1, the cell 2 does not need to initiate RACH, and the cell 1 and the cell 2 use the same TA for uplink transmission; for the cell 3 and the cell 4, because no uplink synchronization is established in the TA group to which the cell belongs, and the two cells belong to the same TA group, the terminal can select one cell from the cell 3 and the cell 4 to initiate contention random access by itself or according to the MAC CE indication, and once the random access of the cell is completed, the other cell can use the uplink TA same as the cell to perform uplink transmission. The random access procedure within multiple TA groups may be performed in series or in parallel.
And 5: after the terminal acquires the uplink timing advance on the activated or newly activated cell, the corresponding uplink timing advance can be used for corresponding uplink data transmission.
Example three (corresponding to method 3):
step 1: a terminal accesses a base station on a cell 1, wherein the cell 1 is called a PCell;
step 2: according to the data volume of the terminal, the base station determines that 4 cells are needed to be added to the terminal, namely cell 2, cell 3, cell 4 and cell 5. Since the PCell in the TA group to which the cell 2 belongs is an RACH cell, the cell 4 in the TA group to which the cell 3 and the cell 4 belong is an RACH cell, and the cell 5 alone belongs to one TA group, the RRC signaling of the cell newly added by the base station for the terminal only needs to carry the random access related information on the cell 4 and the cell 5.
And step 3: since the configured cells are deactivated by default, the base station needs to activate these cells by sending activation/deactivation MAC CEs to the UE before data transmission on these cells.
And 4, step 4: the terminal receives the activation/deactivation MAC CE, judges which cells are activated or newly activated according to the MAC CE, and as for the newly activated cell 2, the same TA as the PCell can be used as the newly activated cell 2 and the PCell belong to one TA group; for the cell 3 and the cell 4 belonging to the same TA group, since only the cell 4 is configured with the random access related information, the random access can be initiated only on the cell 4 to obtain the uplink TA of the TA group. For the cell 5, random access needs to be initiated on the cell 5 to acquire the uplink TA of the TA group. It is noted that the random access on cell 4 and cell 5 may be initiated in parallel or in series.
And 5: after the terminal acquires the uplink timing advance on the newly activated cell, the corresponding uplink timing advance can be used for corresponding uplink data transmission.
In this embodiment, it should be noted that, in step 4, if the base station activates a certain cell in a certain TA group, and the RACH cell in the TA group is not activated, the terminal needs to initiate random access in the RACH cell, which means that the RACH cell is implicitly activated.
Referring to fig. 6, an embodiment of the present invention further provides a wireless communication system, where the system includes:
a base station 60, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter; sending activation/deactivation signaling of the cell configured by the cell configuration signaling to a terminal so as to instruct the terminal to initiate a random access process according to the random access related parameters;
a terminal 61, configured to receive a cell configuration signaling sent by a base station; and receiving an activation/deactivation signaling of the cell configured by the cell configuration signaling, which is sent by a base station, and initiating a random access process according to the random access related parameters to acquire an uplink timing advance TA of the cell activated by the activation/deactivation signaling.
Referring to fig. 7, an embodiment of the present invention further provides an apparatus for triggering random access, where the apparatus includes:
a configuration unit 70, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter;
an activating unit 71, configured to send an activation/deactivation signaling of the cell configured for the cell configuration signaling to the terminal, so as to instruct the terminal to initiate a random access process according to the random access related parameter.
The cell configuration signaling carries random access related parameters of all configured cells; or,
the cell configuration signaling carries configured random access related parameters of a specific cell for initiating random access in a Timing Advance (TA) group to which each cell belongs.
The activation/deactivation signaling also carries indication information of a cell needing to initiate random access.
The activation unit 71 is configured to:
when the cell configuration signaling carries the random access related parameters of the Random Access Channel (RACH) cells in the TA group to which each configured cell belongs, the activated cells indicated by the activation/deactivation signaling comprise specific cells for initiating random access.
The random access related parameters include:
physical random access channel PRACH configuration information and random access preamble related information.
The activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
Referring to fig. 8, an embodiment of the present invention further provides an apparatus for initiating random access, where the apparatus includes:
a receiving unit 80, configured to receive a cell configuration signaling sent by a base station, where the cell configuration signaling carries a random access related parameter;
an access unit 81, configured to receive an activation/deactivation signaling of a cell configured for the cell configuration signaling sent by a base station; and initiating a random access process according to the random access related parameters to acquire an uplink timing advance TA of the cell activated by the activation/deactivation signaling.
The access unit 81 is configured to:
when the cell configuration signaling carries random access related parameters of all configured cells, determining a cell activated or newly activated by a base station according to the activation/deactivation signaling; and for each determined cell, initiating a random access process on the cell according to the random access related parameters of the cell to acquire the uplink TA of the cell.
The access unit 81 is configured to:
when the cell configuration signaling carries random access related parameters of all configured cells, determining a cell activated or newly activated by a base station according to the activation/deactivation signaling;
for each determined cell, judging whether the TA group to which the cell belongs contains the cell with established uplink synchronization;
for each cell judged to be negative, initiating a random access process in the cell according to the random access related parameters of the cell to acquire an uplink TA of the cell; or, for each TA group to which the cell determined as no belongs, selecting a cell activated by the base station or newly activated from the TA group, and initiating a random access process in the selected cell according to the random access related parameter of the selected cell, so as to obtain an uplink TA of the TA group to which the selected cell belongs.
The access unit 81 is configured to:
selecting a base station activated or newly activated cell from the TA group according to a preset random access cell selection rule; or,
and selecting a cell indicated by the random access cell indication information from the TA group according to the random access cell indication information carried in the activation/deactivation signaling.
The access unit 81 is further configured to:
and for each cell judged to be the cell, acquiring the uplink TA of the cell which establishes uplink synchronization in the TA group to which the cell belongs, and taking the TA as the uplink TA of the cell judged to be the cell.
The access unit 81 is further configured to:
when the cell configuration signaling carries the random access related parameters of the specific cell for initiating random access in the TA group to which each configured cell belongs, determining the cell activated or newly activated by the base station according to the activation/deactivation signaling;
and for the determined TA group to which each cell belongs, determining whether the uplink synchronization of the specific cell for initiating the random access in the TA group is established, and if not, initiating a random access process in the specific cell according to the random access related parameters of the specific cell to acquire the uplink TA of the specific cell.
The access unit 81 is further configured to:
when determining that a specific cell for initiating random access in a TA group has established uplink synchronization, acquiring an uplink TA of the specific cell, and taking the TA as the uplink TA of a cell activated by a base station or newly activated by the base station in the TA group to which the specific cell belongs.
The access unit 81 is further configured to:
before a specific cell for initiating random access initiates a random access process, if the specific cell is determined to be in an inactive state, the specific cell is activated.
The access unit 81 is configured to:
for a frequency division duplex FDD system, initiating a random access process at a subframe n +8 or a subframe after the subframe n + 8; or,
for a time division duplex TDD system, initiating a random access process at an uplink subframe n + K or an uplink subframe behind the subframe n + K; the n is a subframe number when the activation/deactivation signaling is received; and the value of K is determined according to a system frame structure and hybrid automatic repeat request (HARQ) Round Trip Time (RTT).
The random access related parameters include:
physical random access channel PRACH configuration information and random access preamble related information.
The activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
In conclusion, the beneficial effects of the invention include:
in the scheme provided by the embodiment of the invention, the base station carries the random access related parameters in the sent cell configuration signaling, and then sends the activation/deactivation signaling to the terminal to indicate the terminal to initiate the random access process according to the random access related parameters. Therefore, in the scheme, the base station does not need to trigger the terminal to initiate a random access process through the PDCCH, and the expense of the PDCCH can be effectively reduced.
In the scheme provided by the embodiment of the invention, a terminal receives a cell configuration signaling sent by a base station, wherein the cell configuration signaling carries random access related parameters; and receiving an activation/deactivation signaling of the cell configured by the cell configuration signaling, which is sent by a base station, and initiating a random access process according to the random access related parameters to acquire an uplink TA of the cell activated by the activation/deactivation signaling. Therefore, in the scheme, when the terminal receives the activation/deactivation signaling sent by the base station, the random access process can be initiated to acquire the timing advance on the newly activated carrier, and compared with the prior art in which the terminal initiates the random access process after receiving the PDCCH signaling sent by the base station, the method and the device can effectively shorten the time delay of the terminal for acquiring the uplink timing advance.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (31)
1. A method for triggering random access, the method comprising:
a base station sends a cell configuration signaling to a terminal, wherein the cell configuration signaling carries random access related parameters;
a base station sends activation/deactivation signaling of a cell configured by the cell configuration signaling to a terminal, wherein the activation/deactivation signaling is used for indicating the terminal to determine the cell activated or newly activated by the base station, and initiates a random access process on the activated or newly activated cell according to the random access related parameters;
wherein the random access related parameters include: physical random access channel PRACH configuration information and random access preamble related information.
2. The method of claim 1, wherein the cell configuration signaling carries random access related parameters of all configured cells; or,
the cell configuration signaling carries configured random access related parameters of a specific cell for initiating random access in a Timing Advance (TA) group to which each cell belongs.
3. The method of claim 1, wherein the activation/deactivation signaling further carries indication information of a cell that needs to initiate random access.
4. The method according to claim 2, wherein when the cell configuration signaling carries the configured random access related parameters of the specific cell for initiating random access in the TA group to which each cell belongs, the activated cells indicated by the activation/deactivation signaling include the specific cell for initiating random access.
5. The method of any of claims 1-4, wherein the activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
6. A method for triggering random access, the method comprising:
a terminal receives a cell configuration signaling sent by a base station, wherein the cell configuration signaling carries random access related parameters;
a terminal receives an activation/deactivation signaling of a cell configured by a base station aiming at the cell configuration signaling, wherein the activation/deactivation signaling is used for indicating the terminal to determine the cell activated or newly activated by the base station, and a random access process is initiated on the activated or newly activated cell according to the random access related parameters so as to obtain an uplink timing advance TA of the cell activated by the activation/deactivation signaling;
wherein the random access related parameters include: physical random access channel PRACH configuration information and random access preamble related information.
7. The method of claim 6, wherein the cell configuration signaling carries random access related parameters of all configured cells; the initiating a random access process according to the random access related parameter to acquire the uplink TA of the cell activated by the activation/deactivation signaling comprises:
the terminal determines the cell activated by the base station or newly activated according to the activation/deactivation signaling;
and the terminal initiates a random access process on each determined cell according to the random access related parameters of the cell so as to acquire the uplink TA of the cell.
8. The method of claim 6, wherein the cell configuration signaling carries random access related parameters of all configured cells; the initiating a random access process according to the random access related parameter to acquire the uplink TA of the cell activated by the activation/deactivation signaling comprises:
the terminal determines the cell activated by the base station or newly activated according to the activation/deactivation signaling;
the terminal judges whether the TA group to which the cell belongs contains the cell which establishes the uplink synchronization or not for each determined cell;
the terminal initiates a random access process in each cell according to the random access relevant parameters of the cell to acquire an uplink TA of the cell for each cell judged as negative; or, the terminal selects a cell activated by the base station or newly activated from the TA group for the TA group to which each cell judged as negative belongs, and initiates a random access process in the selected cell according to the random access related parameters of the selected cell to acquire the uplink TA of the TA group to which the selected cell belongs.
9. The method of claim 8, wherein the terminal selecting a cell activated by the base station or newly activated from the TA group comprises:
the terminal selects a cell activated by the base station or newly activated from the TA group according to a preset random access cell selection rule; or,
and the terminal selects a cell indicated by the random access cell indication information from the TA group according to the random access cell indication information carried in the activation/deactivation signaling.
10. The method of claim 8, further comprising:
and for each cell judged to be the cell, the terminal acquires the uplink TA of the cell established with the uplink synchronization in the TA group to which the cell belongs, and takes the TA as the uplink TA of the cell judged to be the cell.
11. The method according to claim 6, wherein the cell configuration signaling carries configured random access related parameters of a specific cell for initiating random access in a TA group to which each cell belongs; the initiating a random access process according to the random access related parameter to acquire the uplink TA of the cell activated by the activation/deactivation signaling comprises:
the terminal determines the cell activated by the base station or newly activated according to the activation/deactivation signaling;
and the terminal determines whether the uplink synchronization of the specific cell for initiating the random access in the TA group is established for the TA group to which each determined cell belongs, and initiates a random access process in the specific cell according to the random access related parameters of the specific cell to acquire the uplink TA of the specific cell if the uplink synchronization is not established.
12. The method of claim 11, wherein upon determining that uplink synchronization has been established for a particular cell in the TA group that is used to initiate random access, the method further comprises:
and the terminal acquires the uplink TA of the specific cell and takes the TA as the uplink TA of the cell activated by the base station in the TA group to which the specific cell belongs or newly activated.
13. The method of claim 11, wherein prior to initiating a random access procedure for a particular cell used to initiate random access, the method further comprises:
and if the terminal determines that the specific cell is in the non-activated state, activating the specific cell.
14. The method according to any of claims 6-13, characterized in that for a frequency division duplex, FDD, system, the terminal initiates a random access procedure at subframe n +8 or at a subframe after subframe n + 8; or,
for a time division duplex TDD system, a terminal initiates a random access process at an uplink subframe n + K or an uplink subframe behind the subframe n + K; the n is a subframe number when the activation/deactivation signaling is received; and the value of K is determined according to a system frame structure and hybrid automatic repeat request (HARQ) Round Trip Time (RTT).
15. The method of any of claims 6-13, wherein the activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
16. An apparatus for triggering random access, the apparatus comprising:
a configuration unit, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter;
an activation unit, configured to send an activation/deactivation signaling of a cell configured for the cell configuration signaling to a terminal, where the activation/deactivation signaling is used to instruct the apparatus to determine a cell activated or newly activated by a base station, and initiate a random access procedure on the activated or newly activated cell according to the random access related parameter;
wherein the random access related parameters include: physical random access channel PRACH configuration information and random access preamble related information.
17. The apparatus of claim 16, wherein the cell configuration signaling carries random access related parameters of all configured cells; or,
the cell configuration signaling carries configured random access related parameters of a specific cell for initiating random access in a Timing Advance (TA) group to which each cell belongs.
18. The apparatus of claim 16, wherein the activation/deactivation signaling further carries indication information of a cell that needs to initiate random access.
19. The apparatus of claim 17, wherein the activation unit is to:
when the cell configuration signaling carries the configured random access related parameters of the specific cell for initiating the random access in the TA group to which each cell belongs, the activated cell indicated by the activation/deactivation signaling includes the specific cell for initiating the random access.
20. The apparatus of any of claims 16-19, wherein the activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
21. An apparatus for initiating random access, the apparatus comprising:
a receiving unit, configured to receive a cell configuration signaling sent by a base station, where the cell configuration signaling carries a random access related parameter;
an access unit, configured to receive an activation/deactivation signaling sent by a base station for a cell configured by the cell configuration signaling, where the activation/deactivation signaling is used to instruct the apparatus to determine a cell activated by the base station or a newly activated cell; initiating a random access process on the activated or newly activated cell according to the random access related parameters to acquire an uplink Timing Advance (TA) of the cell activated by the activation/deactivation signaling;
wherein the random access related parameters include: physical random access channel PRACH configuration information and random access preamble related information.
22. The apparatus of claim 21, wherein the access unit is to:
when the cell configuration signaling carries random access related parameters of all configured cells, determining a cell activated or newly activated by a base station according to the activation/deactivation signaling; and for each determined cell, initiating a random access process on the cell according to the random access related parameters of the cell to acquire the uplink TA of the cell.
23. The apparatus of claim 21, wherein the access unit is to:
when the cell configuration signaling carries random access related parameters of all configured cells, determining a cell activated or newly activated by a base station according to the activation/deactivation signaling;
for each determined cell, judging whether the TA group to which the cell belongs contains the cell with established uplink synchronization;
for each cell judged to be negative, initiating a random access process in the cell according to the random access related parameters of the cell to acquire an uplink TA of the cell; or, for each TA group to which the cell determined as no belongs, selecting a cell activated by the base station or newly activated from the TA group, and initiating a random access process in the selected cell according to the random access related parameter of the selected cell, so as to obtain an uplink TA of the TA group to which the selected cell belongs.
24. The apparatus of claim 23, wherein the access unit is to:
selecting a base station activated or newly activated cell from the TA group according to a preset random access cell selection rule; or,
and selecting a cell indicated by the random access cell indication information from the TA group according to the random access cell indication information carried in the activation/deactivation signaling.
25. The apparatus of claim 23, wherein the access unit is further configured to:
and for each cell judged to be the cell, acquiring the uplink TA of the cell which establishes uplink synchronization in the TA group to which the cell belongs, and taking the TA as the uplink TA of the cell judged to be the cell.
26. The apparatus of claim 21, wherein the access unit is further configured to:
when the cell configuration signaling carries the random access related parameters of the specific cell for initiating random access in the TA group to which each configured cell belongs, determining the cell activated or newly activated by the base station according to the activation/deactivation signaling;
and for the determined TA group to which each cell belongs, determining whether the uplink synchronization of the specific cell for initiating the random access in the TA group is established, and if not, initiating a random access process in the specific cell according to the random access related parameters of the specific cell to acquire the uplink TA of the specific cell.
27. The apparatus of claim 26, wherein the access unit is further configured to:
when determining that a specific cell for initiating random access in a TA group has established uplink synchronization, acquiring an uplink TA of the specific cell, and taking the TA as the uplink TA of a cell activated by a base station or newly activated by the base station in the TA group to which the specific cell belongs.
28. The apparatus of claim 26, wherein the access unit is further configured to:
before a specific cell for initiating random access initiates a random access process, if the specific cell is determined to be in an inactive state, the specific cell is activated.
29. The apparatus of any of claims 21-28, wherein the access unit is to:
for a frequency division duplex FDD system, initiating a random access process at a subframe n +8 or a subframe after the subframe n + 8; or,
for a time division duplex TDD system, initiating a random access process at an uplink subframe n + K or an uplink subframe behind the subframe n + K; the n is a subframe number when the activation/deactivation signaling is received; and the value of K is determined according to a system frame structure and hybrid automatic repeat request (HARQ) Round Trip Time (RTT).
30. The apparatus of any of claims 21-28, wherein the activation/deactivation signaling is: the medium access control element MAC CE is activated/deactivated.
31. A wireless communication system, comprising:
a base station, configured to send a cell configuration signaling to a terminal, where the cell configuration signaling carries a random access related parameter; sending activation/deactivation signaling of the cell configured by the cell configuration signaling to a terminal, wherein the activation/deactivation signaling is used for indicating the terminal to determine the cell activated by the base station or newly activated cell, and initiating a random access process on the activated or newly activated cell according to the random access related parameters;
the terminal is used for receiving the cell configuration signaling sent by the base station; and receiving an activation/deactivation signaling of the cell configured by the cell configuration signaling, which is sent by a base station, and initiating a random access process on the activated or newly activated cell according to the random access related parameters to acquire an uplink Timing Advance (TA) of the cell activated by the activation/deactivation signaling.
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| KR102092579B1 (en) | 2011-08-22 | 2020-03-24 | 삼성전자 주식회사 | Method and apparatus for support multiple frequency band in a mobile communication system |
| CA2859499C (en) | 2012-01-09 | 2020-07-14 | Samsung Electronics Co., Ltd. | Method and apparatus for logging |
| KR102048742B1 (en) | 2012-01-27 | 2019-11-26 | 삼성전자 주식회사 | Method and apparatus for efficiently controlling access for system load adjustment in mobile communication systems |
| US9414409B2 (en) | 2012-02-06 | 2016-08-09 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting/receiving data on multiple carriers in mobile communication system |
| CN110267355B (en) * | 2012-02-06 | 2022-12-20 | 三星电子株式会社 | Base station and method for supporting random access in mobile communication system |
| CN103313375A (en) * | 2012-03-13 | 2013-09-18 | 中兴通讯股份有限公司 | Random access method for auxiliary service cell and user equipment (UE) |
| WO2015100527A1 (en) * | 2013-12-30 | 2015-07-09 | 华为技术有限公司 | Method and device for activating secondary cell, communication system, base station, and user equipment |
| EP3143717B1 (en) * | 2015-04-15 | 2017-09-13 | Ofinno Technologies, LLC | Activation/deactivation of secondary cells in carrier aggregation |
| CN107623953B (en) * | 2016-07-14 | 2020-04-28 | 展讯通信（上海）有限公司 | Base station, user equipment and random access method thereof |
| CN107623952B (en) * | 2016-07-14 | 2020-05-05 | 展讯通信（上海）有限公司 | Base station, user equipment and random access method thereof |
| CN108282816A (en) * | 2017-01-05 | 2018-07-13 | 中兴通讯股份有限公司 | A kind of cut-in method and access device |
| CN110945957B (en) * | 2017-07-27 | 2024-03-12 | 三星电子株式会社 | Method and apparatus for performing random access procedure |
| MX2019014524A (en) * | 2017-08-28 | 2020-02-10 | Guangdong Oppo Mobile Telecommunications Corp Ltd | DATA TRANSMISSION METHOD, NETWORK DEVICE AND TERMINAL DEVICE. |
| CN111050412B (en) * | 2018-10-12 | 2022-11-25 | 华为技术有限公司 | A random access method and device thereof |
| CN109863817B (en) | 2019-01-16 | 2022-04-08 | 北京小米移动软件有限公司 | Method and apparatus for random access |
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