CN111314980A - Data transmission method and device, storage medium and terminal - Google Patents
Data transmission method and device, storage medium and terminal Download PDFInfo
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- CN111314980A CN111314980A CN202010104920.3A CN202010104920A CN111314980A CN 111314980 A CN111314980 A CN 111314980A CN 202010104920 A CN202010104920 A CN 202010104920A CN 111314980 A CN111314980 A CN 111314980A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
A data transmission method and device, a storage medium and a terminal are provided, wherein the method comprises the following steps: if the UE is transmitting data, acquiring a data transmission cell reselection parameter so as to reselect the cell according to the data transmission cell parameter; or sending a network indication to a base station to inform the base station of acquiring the data transmission information. By the method, interruption of data transmission caused by cell reselection is avoided, data transmission efficiency is effectively improved, and transmission data loss is avoided.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus, a storage medium, and a terminal.
Background
In the prior art, packet transmission mainly includes uplink and/or downlink data packet transmission, and if uplink and downlink transmission is required subsequently, a base station may migrate User Equipment (UE) to a connected state, so that mobility of the UE is controlled by the base station. Or in the data transmission process, if the UE reselects another cell from the mobile cell, the random access process needs to be executed again to request resources.
However, when the UE performs the random access procedure to perform the resource request, the continuity of data transmission cannot be guaranteed, which results in interruption of data transmission.
Disclosure of Invention
The technical problem solved by the invention is how to avoid transmission interruption and data loss caused by cell reselection when UE transmits data.
To solve the foregoing technical problem, an embodiment of the present invention provides a data transmission method, where the method includes: if the UE is transmitting data, acquiring a data transmission cell reselection parameter so as to reselect the cell according to the data transmission cell parameter; or sending a network indication to a base station to inform the base station of acquiring the data transmission information.
Optionally, when the UE performs cell reselection according to the data transmission cell reselection parameter, at least one of raising the priority of the current cell, setting the frequency priority of the current cell to be the highest, and adjusting a cell reselection threshold parameter in the cell reselection parameter is performed.
Optionally, the data-transmission cell reselection parameter is obtained by adjusting the cell reselection parameter, where the adjusting includes: and raising at least one of a threshold for triggering the current cell to perform co-frequency measurement, a threshold for triggering the current cell to perform inter-frequency measurement, and adjusting the cell offset of the current cell.
Optionally, the data transfer cell reselection parameter includes a parameter of a data transfer timer, and the cell reselection according to the data transfer cell parameter includes: starting a data transmission timer according to the parameters of the data transmission timer; and when the timing of the data transmission timer does not exceed the preset time, not reselecting the cell and transmitting data in the current cell.
Optionally, the data-transmission cell reselection parameter further includes a service threshold, and the cell reselection according to the data-transmission cell parameter includes: and when the data volume to be transmitted does not exceed the service threshold, transmitting the data in the current cell.
Optionally, the data transfer cell reselection parameter is indicated in a system message or an RRC release message or downlink control information issued by the current cell.
Optionally, when the data transmission cell reselection parameters indicated in the system message and the RRC release message are different, the data transmission cell reselection parameters indicated in the RRC release message are used as the standard.
Optionally, the data transmission cell reselection parameter includes a data transmission minimum threshold, and if the current cell signal is higher than the threshold, data transmission is performed in the current cell or the priority of the frequency of the current cell is set to be the highest.
Optionally, after the UE transmits the data, the method further includes: judging whether to use the data transmission cell reselection parameter according to the service type or the data volume of the transmitted data; if yes, continuing to acquire the data transmission cell reselection parameters so as to reselect the cell according to the data transmission cell parameters.
Optionally, the sending a network indication to a base station to notify the base station of acquiring data transmission information includes: when UE needs to be reselected to a target cell from a current cell, a first network indication is sent to a base station of the current cell to inform the base station of the current cell to acquire data transmission information; or after the UE reselects the target cell from the current cell, sending a second network instruction to the base station of the target cell to inform the base station of the target cell to acquire data transmission information.
An embodiment of the present invention further provides a data transmission device, where the device includes: the transmission reselection module is used for acquiring a data transmission cell reselection parameter if the UE is transmitting data so as to reselect the cell according to the data transmission cell parameter; or a base station notification module, configured to send a network indication to a base station to notify the base station of acquiring data transmission information.
An embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the data transmission methods described above.
The embodiment of the present invention further provides a terminal, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of any of the data transmission methods when executing the computer program.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a data transmission method, which comprises the following steps: if the UE is transmitting data, acquiring a data transmission cell reselection parameter so as to reselect the cell according to the data transmission cell parameter; or sending a network indication to a base station to inform the base station of acquiring the data transmission information. Compared with the prior art, in the scheme of the invention, when the UE transmits data, the UE can refer to the UE in a non-connection state in particular, the UE judges whether to execute cell reselection according to the data transmission cell reselection parameter, wherein the cell reselection is delayed by improving a reselection threshold and the like, and the UE is left in the current cell to carry out data transmission as much as possible. In addition, the UE in data transmission can send a network indication to the base station of the current cell or the reselected cell, so that the UE is performing data transmission through the base station, and if the cell reselection occurs during the data transmission process, the corresponding base station can complete the data transmission according to the acquired data transmission information. By the method, interruption of data transmission caused by cell reselection can be avoided, data transmission efficiency is effectively improved, and transmission data loss is avoided.
Further, the UE transmitting data is given a proper transmission time, so that the UE can complete data transmission in the current cell as much as possible; if the data transmission is not completed within the preset time, in order to avoid that the communication of the UE is influenced by the over-poor signal quality of the current cell, the UE is still enabled to judge whether to execute the cell reselection according to other limiting conditions of the existing cell reselection parameters.
Further, it may be determined whether a non-connected UE that is transmitting data reselects a cell when triggering cell reselection based on the traffic dimension.
Further, a condition for using the data transfer cell reselection parameter is defined, which can be set according to a traffic type or a data amount of data to be transmitted.
Further, after the UE for data transmission selects the target cell through cell reselection, when accessing the network of the target cell, the UE may indicate to the base station of the target cell that data transmission is currently performed, so as to continue to transmit data that is not successfully transmitted, thereby avoiding data loss.
Drawings
Fig. 1 is a schematic diagram of a CBRA random access scheme of a UE in the prior art;
FIG. 2 is a diagram illustrating another prior art CBRA random access scheme for a UE;
fig. 3 is a diagram illustrating a CFRA random access scheme of a UE in the prior art;
fig. 4 is a flowchart illustrating a data transmission method according to an embodiment of the present invention;
fig. 5 is a partial flow chart of a data transmission method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.
Detailed Description
As background, in a New Radio (NR) protocol of The 3rd Generation partnership project (3 GPP), an air interface of a UE has three states: IDLE (IDLE), INACTIVE (INACTIVE) and CONNECTED (CONNECTED) states are referred to as (RRC _ IDLE, RRC _ INACTIVE, RRC _ CONNECTED) in 3GPP NR, where RRC is an abbreviation for Radio Resource Control (Radio Resource Control). In IDLE state, the UE is not connected to the base station, and only needs to periodically initiate location update, cell selection and reselection flow, receive paging, and the like. In the CONNECTED state, the UE is CONNECTED to a network of the base station, the network configures a Radio Bearer (RB) of the UE and a related configuration of a physical layer, and the network may perform uplink and downlink data scheduling on the UE. In the INACTIVE state, the UE moves within a certain range of a RAN-Based Notification Area (RNA, where RAN is short for Radio Access Network), without notifying a base station, the UE may reserve certain configurations (currently, the UE may reserve configurations of Packet Data Convergence Protocol (PDCP), Service Data Adaptation Protocol (SDAP), and the like, and an original serving Cell, that is, some low-level (low-layer) configurations of a Primary Cell (Pcell), but may not reserve a high-level (low-layer) SCG configuration), and if the Network needs to schedule the UE or the UE has Data to send, the UE needs to move to a CONNECTED state, and the reserved configuration is recovered to perform Data transmission.
If the UE needs to initiate data transmission in the non-CONNECTED state (i.e., IDLE state and INACTIVE state), the UE needs to perform migration to the CONNECTED state along with the access procedure, so that data transmission can be performed. When the UE is in the non-CONNECTED state and the mobile cell reselects to another cell, the UE needs to perform a random access procedure to request resources.
The UE performs Random Access mainly including two Access modes, namely Contention-Based Random Access (CBRA) and non-Contention-Based Random Access (CFRA).
Fig. 1 shows a specific access method when a CBRA method is used, where fig. 1 is a schematic diagram of a CBRA random access method for a UE in the prior art. The method can comprise the following steps:
step 1: the UE selects an SSB or a Channel State Information Reference Signal (CSI-RS) from a Synchronization Signal Block (SSB) or a CSI-RS that satisfies a condition, then selects a preamble, and transmits a preamble sequence for Random Access (i.e., MSG1 shown in fig. 1) through an opportunity or time-frequency resource (RO or prachhocation) of a Physical Random Access Channel that is allowed to be initiated;
step 2: the UE receives a Random Access Response (RAR) sent by a network (MSG 2 shown in fig. 1), the UE receives a Random Access Response (RA-RNTI) through detecting a Physical Downlink Control Channel (PDCCH) scrambled by a Random Access Radio network Identity (RA-RNTI), the RAR includes a Timing advance command (Timing advance command), wherein the information of the Timing Advance (TA) is carried in the RAR, an Uplink grant (UL grant) carries scheduling information of the MSG3 (shown in fig. 1) sent by the UE, wherein the MSG2 includes a cell Temporary Identity (RNTI-C) for Temporary scheduling assigned to the UE by a base station, and the RNTI are further used for successful network-TC communication when the UE-TC is successfully accessed to the network, the C-RNTI is a short name of a Cell-Radio network temporary Identifier (Cell-Radio network temporary Identifier), and the TC-RNTI is used for the UE to receive the MSG 4.
In practice, multiple UEs may select the same RO and preamble to initiate a random access procedure, and then access collision occurs, so that collision resolution may be performed through steps 3 and 4 below;
and step 3: the UE transmits MSG3 using the uplink grant received in MSG 2. Wherein, if the UE has the C-RNTI, the transmitted MSG3 may include: a Medium Access Control Element (MAC Control Element or MAC CE) of the C-RNTI, and if there is a spare, other information such as a Buffer Status Report (BSR) may be sent. If the UE does not have the C-RNTI, which mainly refers to the UE in IDLE state and INACTIVE state, the MSG3 sent by the UE may include: a message of a Common Control Channel (CCCH) of Radio Resource Control (RRC, for short), may specifically include a message of a Setup Request (Setup Request) or a recovery Request (Resource Request), and the like, where a part of information carried in the message may be used as an identifier (Identity, for short) of the UE for collision resolution.
And 4, step 4: if the UE has the C-RNTI, the UE receives scheduling data (namely MSG4 in fig. 1) sent by a base station (the data is PDCCH scrambled by using the C-RNTI), the scheduling data is received by the specific UE at the moment, if the UE receives the information, the conflict is successfully solved, the UE successfully executes a random access process, and the UE is changed to a CONNECTED state; if the UE does not receive the scheduling data of the base station within a certain time, the conflict resolution is considered to fail. If the UE does not have the C-RNTI, the UE receives scheduling data by using the TC-RNTI received by the MSG3, and if the UE receives the scheduling data carrying a collision resolution identity (Contention resolution identity) MAC CE, the conflict resolution is considered to be successful.
To speed up the random access procedure, reduce the delay and reduce the number of messages, a procedure using two-step random access is proposed, please refer to fig. 1 and fig. 2, and fig. 2 is a schematic diagram of another CBRA random access method for a UE in the prior art. The method can comprise the following steps:
the MSGA includes information of MSG1 and MSG3 in fig. 1, that is, a preamble (preamble) sent on the PRACH and a payload (payload) sent on a Physical Uplink Shared Channel (PUSCH) may also be referred to as an effective time or time-frequency resource (PUSCH, PO). The MSGB contains the information of MSG2 and MSG 4. If the network receives only the preamble sent by the UE, the network replies to the MAC RAR of the four-step random access process, and the UE returns to the four-step process in FIG. 1. If the UE in the non-CONNECTED state needs to transmit data, state transition is performed first, and the UE is switched to the CONNECTED state, so that the MSGA only contains a Radio Resource Control (RRC) message, and the transmitted data needs to be transmitted after a random access procedure is completed.
In the CBRA random access manners for the two UEs in fig. 1 and fig. 2, a scenario where a terminal initiates (MO), where the MO scenario is a scenario where the UE needs to perform data transmission. In order to send Data to be transmitted in a non-CONNECTED state, the MSG3 or MSGA sent by the UE may carry Data to be sent in addition to the RRC, so as to become Early Data Transmission (EDT). Meanwhile, if the TA information is valid, the UE may also directly transmit data without transmitting a preamble. When the network Pre-allocates a dedicated Pre-configured Uplink Resource (PUR for short) or a configured grant (CG for short) to the UE, the UE using the Resource to send has an effective TA. Compared with the random access process comprising 4 steps in fig. 1, two steps of transmitting or receiving of MSG1 and MSG2 are reduced.
In addition, if the UE adopts the CFRA access method, a specific access schematic diagram of the UE refers to fig. 3, and fig. 3 is a schematic diagram of a CFRA random access method of the UE in the prior art; in the CFRA Access method, a base station (or called network) configures dedicated resources (mainly, time-frequency resources and code resources for initiating a Preamble, where the resources may be indicated by a code Index (ra-Preamble Index)), that is, the base station sends dedicated resource configuration information (shown in fig. 3) to a UE to be accessed, and then the UE sends a Random Access Preamble (Random Access Preamble) shown in fig. 3 to the network, and when a Random Access Response (Random Access Response) representing successful Access is received, the Random Access is successful.
For the data transmission of the UE shown in fig. 1 to fig. 3, the data transmission may include packet transmission, and the packet transmission is mainly determined based on network configuration, for example, when the data amount that the UE needs to send is smaller than a certain threshold, or characteristics such as delay requirement and transmission cycle corresponding to the transmission data, the network may configure a mode in which the UE uses packet transmission.
In summary, when the UE is in the non-CONNECTED state, the UE may perform cell reselection in the random access manner shown in fig. 1, fig. 2, or fig. 3 to access the network of the new cell. However, in the prior art, when the UE performs the random access procedure of fig. 1, 2 or 3, the packet transmission cannot be performed, and thus the transmission of data is interrupted.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
To solve the above technical problem, an embodiment of the present invention provides a data transmission method during cell reselection, please refer to fig. 4, where the method includes the following steps:
step S401, if the UE is transmitting data, acquiring a data transmission cell reselection parameter so as to reselect a cell according to the data transmission cell parameter; or
Step S402, sending a network instruction to a base station to inform the base station to acquire data transmission information.
In the prior art, in order to obtain better service quality, when the signal quality of a current cell is poor, a UE may be connected to a cell with better signal quality through cell reselection. When the UE is in the non-connected state, it needs to determine whether the UE is performing data transmission, and if so, for continuity of data transmission, the UE should be kept connected to the current cell as much as possible to complete data transmission, and then cell reselection is performed, that is, steps S401 and S402 above.
The cell reselection parameter is a parameter which is issued by a base station of the current cell to the UE and is used for judging whether the UE reselects to a new cell when the UE detects that the signal quality is poor.
The data transmission cell reselection parameter is a parameter obtained by adjusting the cell reselection parameter; the data transmission cell reselection parameter can be used for indicating the cell reselection parameter that the UE judges whether to execute cell reselection according to the parameter when the UE is in a non-connection state and transmits data, and the reselection threshold can be higher than that of the existing cell reselection parameter, so that the UE can transmit data in the current cell as much as possible, and the interruption of data transmission caused by cell reselection can be avoided. The reselection threshold refers to a threshold used for indicating whether to perform cell reselection in cell reselection parameters, such as a priority of each cell, a plurality of reselection measurement threshold parameters, and the like. Optionally, the data transmission cell reselection parameter may be indicated in a message sent by the base station to the UE.
In addition, the UE that is performing data transmission may send a network indication to the base station of the cell to notify the base station that the UE is performing data transmission without setting the data transmission cell reselection parameter. If the UE performs cell reselection, the cell reselection includes a cell before reselection, that is, a current cell, and a cell after reselection, that is, a target cell.
The UE may send a network indication to the base station of the current cell to notify the base station that the UE is about to perform cell reselection, and a situation of data transmission interruption may occur, and the base station of the current cell may obtain data transmission information before cell reselection, such as a transmission schedule. In addition, the UE may also send a network indication to the base station of the target cell, and when the UE reselects the target cell, the base station of the target cell acquires data information, such as a transmission schedule, of the UE in the current cell.
Through the data transmission method in fig. 4, when the UE is transmitting data, which may particularly refer to a UE in a non-connected state, the UE determines whether to perform cell reselection according to a data transmission cell reselection parameter, where the data transmission cell reselection parameter delays cell reselection by increasing a reselection threshold and leaves the UE in a current cell as much as possible for data transmission. In addition, the UE in data transmission can send a network indication to the base station of the current cell or the reselected cell, so that the UE is performing data transmission through the base station, and if the cell reselection occurs during the data transmission process, the corresponding base station can complete the data transmission according to the acquired data transmission information. By the method, interruption of data transmission caused by cell reselection can be avoided, data transmission efficiency is effectively improved, and transmission data loss is avoided.
In one embodiment, when the UE performs cell reselection according to the data-transmission cell reselection parameter, at least one of raising the priority of the current cell, setting the frequency priority of the current cell to be the highest, and adjusting a cell reselection threshold parameter in the cell reselection parameter is performed.
The technical background of a specific cell reselection is as follows:
the basis for successful cell selection should satisfy the S criterion, which is evaluated according to the received Power (Srxlev) in cell search and the received Signal Quality (Squal) in cell search, i.e. according to the Reference Signal Received Power (RSRP) and RSRQ (Reference Signal Receiving Quality), which are calculated from the Signal Quality detected by the UE itself, the lowest Signal Quality threshold configured in the system message, and other offset (offset).
Basis for reselection of a cell: the Cell reselection is evaluated according to an H criterion and an R criterion, and the H criterion or the R criterion is selected according to whether the Cell is configured with a Hierarchical Cell Structure (HCS) or not, wherein the H criterion and the R criterion are obtained by calculating signal quality (Qmeas) measured by UE and network parameters, the Qmeas is obtained by configuration in system messages, the Cell which is the best sequenced according to the H criterion and the R criterion is reselected, and the R criterion is mainly adopted to sequence the cells.
Priority of cell reselection: the priority of cell reselection can be embodied in the selection process or H, R calculation, and an absolute level of cell reselection is introduced, that is, different priorities are provided for frequency points or different RATs, and are embodied by absolute priorities.
Triggering conditions of reselection: in the system message of the cell, thresholds for triggering different mode measurements are generally configured, that is, a measurement for triggering a mode reselection is only triggered when a signal of the cell measured by the UE is lower than a certain threshold. The method has the advantages that when the cell signal is good, a certain service quality can be met without reselection, so that the resource scheduling is more reasonable or saved. Of course such a threshold may also be absent, i.e. indicating that the evaluation of cell reselection is ongoing.
When reselecting a cell, the UE determines whether to perform cell reselection according to the measured priorities of the candidate cells and a cell reselection threshold parameter, where specific reselection mode criteria refer to the above-mentioned S criterion, H criterion, and R criterion. In order to enable the UE transmitting data to stay in the current cell as much as possible to complete data transmission, part of the parameters in the cell reselection parameters may be adjusted, where the adjustment refers to increasing or decreasing, or increasing or deleting part of the parameters of the relevant threshold value, so as to achieve the purpose that the current cell is called a cell preferentially selected in cell reselection and cell reselection is not performed, that is, the cell reselection threshold is increased. For example, one or more of raising the priority of the current cell, setting the current cell frequency priority to be highest, and adjusting a cell reselection threshold parameter in the cell reselection parameters.
In one embodiment, the data-transfer cell reselection parameter is obtained by adjusting a cell reselection parameter, where the adjusting includes: and raising at least one of a threshold for triggering the current cell to perform co-frequency measurement, a threshold for triggering the current cell to perform inter-frequency measurement, and adjusting the cell offset of the current cell. The cell reselection threshold parameter includes a threshold for co-frequency reselection and a threshold for inter-frequency reselection, specifically includes a threshold for starting co-frequency measurement or a threshold for starting inter-frequency measurement, and may also include a cell offset (a qoffsetemp value in an S criterion or an R criterion, which is indicated by a base station) of the current cell. The adjustment of the cell reselection threshold parameter may include adjusting one or more of the three parameters to delay triggering of the intra-frequency or inter-frequency measurement, or to make the current cell rank first in the cell ranking process as much as possible, thereby improving the possibility that the UE resides in the current cell.
In an embodiment, the data-transfer cell reselection parameter includes a parameter of a data-transfer timer, please continue to refer to fig. 4, and the performing cell reselection according to the data-transfer cell parameter in step S401 includes: starting a data transmission timer according to the parameters of the data transmission timer; and when the timing of the data transmission timer does not exceed the preset time, not reselecting the cell and transmitting data in the current cell.
The data transmission cell reselection parameters may further include parameters of a data transmission timer, so that the UE locally starts the timer according to the parameters. The parameter of the data transmission timer may include a threshold value, i.e., a preset time, timed by the timer.
When the UE performs data transmission, a data transmission timer is started locally at the UE, if the timing time does not exceed the preset time, cell reselection is not performed, and data transmission is performed in the current cell; and if the timing time exceeds the preset time, judging whether to execute cell reselection according to the cell reselection parameters or the data transmission cell reselection parameters.
In this embodiment, a transmission time is given to the UE transmitting data, so that the UE may complete data transmission in the current cell as much as possible; if the data transmission is not completed within the preset time, in order to avoid that the communication of the UE is influenced by the over-poor signal quality of the current cell, the UE is still enabled to judge whether to execute the cell reselection according to other limiting conditions of the data transmission cell reselection parameters.
In an embodiment, the data-transfer cell reselection parameter further includes a service threshold, please continue to refer to fig. 4, and the performing cell reselection according to the data-transfer cell parameter in step S401 includes: and when the data volume to be transmitted does not exceed the service threshold, transmitting the data in the current cell. The method further comprises the steps of transmitting data at the UE and needing cell reselection, judging whether the data volume to be transmitted exceeds a threshold, and if not, continuing data transmission at the current cell.
The service threshold is a threshold set for service-related dimensions such as the traffic volume of data to be transmitted. The traffic volume may refer to data volume, and may also be obtained by counting transmitted data according to the traffic demand.
And judging whether the data transmission is finished in the current cell or not according to the service dimension of the transmitted data. For data transmission which does not exceed the service threshold, transmitting in the current cell; and for the data transmission exceeding the service threshold, cell reselection can be executed, and the transmission is carried out after the UE is connected to another cell for reselection.
In this embodiment, it is determined whether a non-connected UE that is transmitting data reselects a cell when triggering cell reselection based on service dimensionality.
In an embodiment, the data transfer cell reselection parameter is indicated in a system message or an RRC message or downlink control information issued by the current cell.
The Radio Resource Control (RRC) message may be an RRC release message or other RRC messages, where the RRC release message is a message that is sent by the network to the UE and releases the RRC connection of the UE. The system message or the RRC message may carry specific data transfer cell reselection parameter information, and further may be used to instruct the UE to use the parameter. Downlink Control Information (DCI) is Information used by a network to schedule data transmission of a UE, and may be used to indicate the UE to use a data transmission cell reselection parameter obtained in a system message or an RRC message.
Optionally, when the data transmission cell reselection parameters indicated in the system message and the RRC release message are different, the data transmission cell reselection parameters indicated in the RRC release message are used as the standard.
In NR or LTE, a system message is broadcast by a cell base station to each connected UE, and an RRC release message is sent by the base station to the UE to be released. The data-transfer cell reselection parameter may be indicated in a system message or an RRC release message sent by the current cell to the UE. And if the data transmission cell reselection parameters indicated by the two parameters are the data transmission cell reselection parameters, the data transmission cell reselection parameters indicated by the RRC release message are used as the reference.
Optionally, the data transmission cell reselection parameter may be indicated in a data transmission process between the base station and the UE, and may be sent to the UE together with the transmitted data.
In one embodiment, the data transmission cell reselection parameter includes a data transmission minimum threshold, and if the signal of the current cell is higher than the threshold, data transmission is performed in the current cell or a frequency point of the current cell is set as a highest priority.
In an embodiment, please refer to fig. 4 again, step S401 in fig. 4 further includes the following steps S501 to S503 in fig. 5 if the UE transmits data, and fig. 5 is a partial flowchart of the data transmission method in an embodiment, where:
step S501, determining whether to use the data transmission cell reselection parameter according to the service type or the data volume of the transmitted data.
Step S502, if yes, continuing to acquire the data transmission cell reselection parameters so as to reselect the cell according to the data transmission cell parameters.
Conditions for using data-transfer cell reselection parameters may be set, which may be set according to the type of service and the amount of data transferred. For example, when the priority corresponding to the service type is higher and the amount of transmitted data is smaller, the data transmission cell reselection parameter is used. For example, when a threshold exceeding the traffic volume can be set, it is determined that the condition for using the data transmission cell reselection parameter is not satisfied; otherwise, the condition is satisfied. For another example, priority information of transmission data, such as priority of a Logical Channel (LCH), may be set, and a data transmission cell reselection parameter is enabled only for data transmission of a Channel with higher priority, specifically, it is determined whether the data transmission cell reselection parameter is included in the priority information of the transmission data according to the LCH of the data to be transmitted, and if the data transmission cell reselection parameter is enabled.
When the UE determines to transmit data according to step S401 in fig. 4, the UE determines whether to use the data transfer cell reselection parameter according to a condition for using the data transfer cell reselection parameter. If the condition of using the data transfer cell reselection parameter is satisfied, continuing to execute step S502, that is, the latter half of step S401 in fig. 4;
step S503 may also be included, if not, obtaining a cell reselection parameter, and performing cell reselection according to the cell reselection parameter.
If the condition for using the data-transfer cell reselection parameter is not satisfied, step S503 is executed, that is, executed according to the existing cell reselection step. That is, the base station can configure the cell reselection parameter in the prior art and the data transmission cell reselection parameter in the present invention for the UE at the same time, and the UE selects which one of the two sets of parameters to use according to its own condition.
In this embodiment, a condition for using the data transfer cell reselection parameter is further defined, and the condition may be set according to a traffic type or a data amount of data to be transmitted.
In an embodiment, with continuing reference to fig. 4, the sending a network indication to the base station to notify the base station of acquiring the data transmission information at step S402 in fig. 4 includes: when UE needs to be reselected to a target cell from a current cell, sending a first network indication to a base station of the current cell to inform the base station of the current cell to acquire data transmission information; or after the UE reselects the target cell from the current cell, sending a second network instruction to the base station of the target cell to inform the base station of the target cell to acquire data transmission information.
Optionally, the UE may send a first network indication to the base station of the current cell, and inform the base station of the current cell that the UE needs to perform cell reselection, so that the base station of the current cell obtains a data transmission progress of the UE when the cell reselection occurs, and determines the target cell, and triggers UE context interaction or migration between the base station of the current cell and the base station of the target cell, and data forwarding, including data transfer that is not successfully transmitted or not transmitted, so that the UE can continue unfinished data transmission in the target cell after the cell reselection.
If the UE reselects to another cell, i.e. the target cell, through the cell, the connection method refers to the steps in fig. 1 to fig. 3, and the UE may send a second network indication to the base station of the target cell to inform the base station of the target cell that the UE is performing data transmission in the previous cell, so that the base station of the target cell obtains a corresponding data transmission message, and then cooperates with the UE to complete data transmission.
Optionally, the second network indication may be indicated in a Random Access Channel (RACH) procedure initiated by the UE.
Optionally, based on the UE indication, the base station of the target cell may notify the base station of the current cell to acquire a context of data transmission of the UE and/or perform data forwarding (data forwarding), forward data to be transmitted to the UE or data that the UE has not successfully transmitted to the base station of the target cell, and continue sending the data to the UE.
Optionally, the UE notifies the base station of the current cell before performing cell reselection, and triggers a context relocation (context relocation) or data forwarding (data forwarding) procedure, for example, the UE may notify the base station of the current cell through an RRC message or an MAC CE indication.
The preamble and po (pusch interference) or pur (predefined Uplink resource) resources of the UE in the target cell may be further configured to accelerate the access speed.
In this embodiment, after the UE for data transmission selects the target cell through cell reselection, when accessing the network of the target cell, the UE may indicate to the base station of the target cell that data transmission is currently performed, so as to continue to transmit data that is not successfully transmitted, thereby avoiding data loss.
Referring to fig. 6, the present invention further provides a data transmission apparatus, which may include:
a transmission reselection module 601, configured to obtain a data transmission cell reselection parameter if the UE is transmitting data, so as to perform cell reselection according to the data transmission cell parameter; or
A base station notification module 602, configured to send a network indication to a base station to notify the base station to acquire data transmission information.
In an embodiment, the transmission reselection module 601 is further configured to, when the UE performs cell reselection according to the data transmission cell reselection parameter, perform at least one of increasing the priority of the current cell, setting the frequency priority of the current cell to be the highest, and adjusting a cell reselection threshold parameter in the cell reselection parameter.
Optionally, the data-transmission cell reselection parameter is obtained by adjusting the cell reselection parameter, where the adjusting includes: and raising at least one of a threshold for triggering the current cell to perform co-frequency measurement, a threshold for triggering the current cell to perform inter-frequency measurement, and adjusting the cell offset of the current cell. In one embodiment, the data transmission cell reselection parameter includes a parameter of a data transmission timer, and the transmission reselection module 601 includes:
and the timer starting unit is used for starting the data transmission timer according to the parameters of the data transmission timer.
And the current cell transmission unit is used for not reselecting the cell and transmitting data in the current cell when the timing of the data transmission timer does not exceed the preset time.
In an embodiment, the data transmission cell reselection parameter further includes a service threshold, and the transmission reselection module 601 is further configured to perform data transmission in the current cell when the transmitted data does not exceed the service threshold.
In an embodiment, the data transfer cell reselection parameter is indicated in a system message or an RRC release message or downlink control information issued by the current cell.
Optionally, when the data transmission cell reselection parameters indicated in the system message and the RRC release message are different, the data transmission cell reselection parameters indicated in the RRC release message are used as the standard.
Optionally, the data transmission cell reselection parameter includes a data transmission minimum threshold, and if the current cell signal is higher than the threshold, data transmission is performed in the current cell or the priority of the frequency of the current cell is set to be the highest.
In one embodiment, the transmission reselection module 601 in the data transmission apparatus of fig. 6 may include:
a transmission determination unit, configured to detect whether the UE is transmitting data;
the parameter selection unit is used for judging whether the data transmission cell reselection parameter is used according to the service type or the data volume of the transmitted data;
and if so, continuing to acquire the data transmission cell reselection parameter and reselecting the cell according to the data transmission cell parameter.
In one embodiment, the base station notification module 602 in the data transmission apparatus of fig. 6 includes:
a current base station notification unit, configured to send a first network indication to a base station of a current cell to notify the base station of the current cell to acquire data transmission information when the UE needs to reselect a target cell from the current cell; or
And the target base station notification unit is used for sending a second network instruction to the base station of the target cell to notify the base station of the target cell to acquire data transmission information after the UE reselects the target cell from the current cell.
For more details on the operation principle and operation mode of the data transmission device, reference may be made to the related descriptions in fig. 4 and fig. 5, which are not described herein again.
Further, the embodiment of the present invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the technical solutions of the methods in the embodiments shown in fig. 4 and fig. 5 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The storage medium may include ROM, RAM, magnetic or optical disks, and the like.
Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the method technical solution in the embodiment shown in fig. 4 and 5 when executing the computer instructions. The terminal can be a mobile phone, a computer and other terminals.
The technical scheme of the invention can be applied to 5G (5Generation) communication systems, 4G and 3G communication systems, and various future new communication systems such as 6G and 7G.
The technical solution of the present invention is also applicable to different network architectures, including but not limited to relay network architecture, dual link architecture, Vehicle-to-event architecture, and the like.
A Base Station (BS) in the embodiment of the present application, which may also be referred to as a base station device, is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, the device providing the base station function in the 2G network includes a Base Transceiver Station (BTS), the device providing the base station function in the 3G network includes a node B (nodeb), the device providing the base station function in the 4G network includes an evolved node B (eNB), the device providing the base station function in the Wireless Local Area Network (WLAN) is an Access Point (AP), the device providing the base station function in the 5G New Radio (NR) is a gbb (eNB) providing the base station function, and the node B (ng-eNB) continues to evolve, where the gbb and the terminal communicate with each other by using an NR technique, the ng-eNB and the terminal communicate with each other by using an E-utra (evolved Universal Radio access) technique, and both the gbb and the ng-eNB may be connected to the 5G core network. The base station in the embodiment of the present application also includes a device and the like that provide a function of the base station in a future new communication system.
The base station controller in the embodiment of the present application is a device for managing a base station, for example, a Base Station Controller (BSC) in a 2G network, a Radio Network Controller (RNC) in a 3G network, or a device for controlling and managing a base station in a future new communication system.
The network on the network side in the embodiment of the present invention refers to a communication network providing communication services for a terminal, and includes a base station of a radio access network, a base station controller of the radio access network, and a device on the core network side.
A terminal in this embodiment may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station (mobile station, MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a Wireless communication function, a computing device or other processing devices connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment of the present application. In the embodiment of the application, a unidirectional communication link from an access network to a terminal is defined as a downlink, data transmitted on the downlink is downlink data, and the transmission direction of the downlink data is called as a downlink direction; the unidirectional communication link from the terminal to the access network is an uplink, the data transmitted on the uplink is uplink data, and the transmission direction of the uplink data is referred to as an uplink direction.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this document indicates that the former and latter related objects are in an "or" relationship.
The "plurality" appearing in the embodiments of the present application means two or more.
The descriptions of the first, second, etc. appearing in the embodiments of the present application are only for illustrating and differentiating the objects, and do not represent the order or the particular limitation of the number of the devices in the embodiments of the present application, and do not constitute any limitation to the embodiments of the present application.
The term "connect" in the embodiments of the present application refers to various connection manners, such as direct connection or indirect connection, to implement communication between devices, which is not limited in this embodiment of the present application.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (13)
1. A method of data transmission, the method comprising:
if the UE is transmitting data, acquiring a data transmission cell reselection parameter so as to reselect the cell according to the data transmission cell parameter; or
Sending a network indication to a base station to inform the base station to acquire data transmission information.
2. The method of claim 1, wherein when the UE performs cell reselection according to the data-transmission cell reselection parameter, at least one of raising a priority of a current cell, setting a frequency priority of the current cell to be highest, and adjusting a cell reselection threshold parameter in the cell reselection parameter is performed.
3. The method of claim 2, wherein the data-transfer cell reselection parameter is obtained by adjusting a cell reselection parameter, and wherein the adjusting comprises: and raising at least one of a threshold for triggering the current cell to perform co-frequency measurement, a threshold for triggering the current cell to perform inter-frequency measurement, and adjusting the cell offset of the current cell.
4. The method of claim 1, wherein the data-transfer cell reselection parameter comprises a parameter of a data-transfer timer, and wherein the performing cell reselection according to the data-transfer cell parameter comprises:
starting a data transmission timer according to the parameters of the data transmission timer;
and when the timing of the data transmission timer does not exceed the preset time, not reselecting the cell and transmitting data in the current cell.
5. The method of claim 1, wherein the data-transfer cell reselection parameter further comprises a traffic threshold, and wherein the performing cell reselection according to the data-transfer cell parameter comprises:
and when the data volume to be transmitted does not exceed the service threshold, transmitting the data in the current cell.
6. The method of claim 1, wherein the data-transfer cell reselection parameter is indicated in a system message or an RRC release message or downlink control information issued by the current cell.
7. The method of claim 6, wherein when the data-transfer cell reselection parameters indicated in the system message and the RRC release message are different, the data-transfer cell reselection parameters indicated in the RRC release message are subject to control.
8. The method of claim 1, wherein the data-transfer cell reselection parameter comprises a data-transfer minimum threshold, and wherein if the current cell signal is higher than the threshold, the data transmission is performed in the current cell or the priority of the frequency of the current cell is set to be the highest.
9. The method of claim 1, wherein the step of, if the UE is after transmitting data, further comprises:
judging whether to use the data transmission cell reselection parameter according to the service type or the data volume of the transmitted data;
if yes, continuing to acquire the data transmission cell reselection parameters so as to reselect the cell according to the data transmission cell parameters.
10. The method of claim 1, wherein sending a network indication to a base station to inform the base station to obtain data transmission information comprises:
when UE needs to be reselected to a target cell from a current cell, a first network indication is sent to a base station of the current cell to inform the base station of the current cell to acquire data transmission information; alternatively, the first and second electrodes may be,
and after the UE is reselected to the target cell from the current cell, sending a second network instruction to the base station of the target cell to inform the base station of the target cell to acquire data transmission information.
11. A data transmission apparatus, characterized in that the apparatus comprises:
the transmission reselection module is used for acquiring a data transmission cell reselection parameter if the UE is transmitting data so as to reselect the cell according to the data transmission cell parameter; or
And the base station notification module is used for sending a network instruction to the base station to notify the base station of acquiring the data transmission information.
12. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, realizing the steps of the method according to any of the claims 1 to 10.
13. A terminal comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method according to any of claims 1 to 10.
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| CN202010104920.3A CN111314980A (en) | 2020-02-20 | 2020-02-20 | Data transmission method and device, storage medium and terminal |
| PCT/CN2021/074582 WO2021164528A1 (en) | 2020-02-20 | 2021-02-01 | Data transmission method and apparatus, storage medium and terminal |
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| CN202010104920.3A CN111314980A (en) | 2020-02-20 | 2020-02-20 | Data transmission method and device, storage medium and terminal |
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