CN105323852B - Uplink bearer modification method and device - Google Patents
Uplink bearer modification method and device Download PDFInfo
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- CN105323852B CN105323852B CN201410363981.6A CN201410363981A CN105323852B CN 105323852 B CN105323852 B CN 105323852B CN 201410363981 A CN201410363981 A CN 201410363981A CN 105323852 B CN105323852 B CN 105323852B
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- 230000009977 dual effect Effects 0.000 claims description 11
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- 239000000725 suspension Substances 0.000 claims description 3
- 230000004048 modification Effects 0.000 abstract description 30
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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
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
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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
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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Abstract
The invention discloses a modification method and a modification device for an uplink bearer. Wherein, the method comprises the following steps: a terminal in double connection receives an uplink data sending node change command, wherein the uplink data sending node change command indicates that the terminal changes the uplink data sent by a first uplink data sending node to the uplink data sent by a second uplink data sending node; the terminal continuously sends the existing part or all uplink data of the buffer zone of the Radio Link Control (RLC) layer and the Media Access Control (MAC) layer corresponding to the first uplink data sending node in the terminal through the first uplink data sending node; and the terminal clears the uplink data of the RLC layer and the MAC layer buffer zone corresponding to the first uplink data sending node.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for modifying an uplink bearer.
Background
Fig. 1 is a schematic diagram of an overall architecture of an LTE system in the prior art, and as shown in fig. 1, the architecture of the LTE system mainly includes: a Mobility Management Entity (MME), a Serving Gateway (SGW), a User Equipment (UE), and a base station (eNB, eNodeB). The interface between the UE and the eNB is a UU interface, the interface between the eNB and the MME is an S1-MME (S1for the control plane) interface, the interface between the eNB and the SGW is an S1-U interface, and the interface between the two eNBs is an X2 interface. Here, the UE may also be referred to as a terminal.
Fig. 2 is a schematic diagram of a protocol architecture of a user plane between a UE and an eNB in LTE in the related art. In LTE, an interface between UE and eNB is divided into the following protocol layers from bottom to top: a Physical layer (PHY), a Media Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer. Wherein, the PHY layer mainly transmits information to the MAC or higher layer through a transmission channel; the MAC layer mainly provides data transmission and is responsible for wireless resource allocation through a logical channel, and completes functions such as Hybrid ARQ (HARQ for short), Scheduling (SCH for short), priority processing, Multiplexing and demultiplexing (MUX for short), and the like; the RLC layer mainly provides segmentation and retransmission services for user and control data; the PDCP layer mainly completes the transfer of user data to the RRC or an upper layer of the user plane. The uplink data transmission is carried out in such a way that data firstly enters a PDCP layer buffer area at the terminal side, then enters an RLC layer buffer area, then enters an MAC layer, and then is transmitted to a base station through the PHY layer, and PHY, MAC, RLC and PDCP of the base station are sequentially received, wherein the MAC of the base station receives the data and feeds back the data to the MAC layer of the terminal, the RLC of the base station receives the data and responds a status report to the RLC layer of the terminal, and the RLC layer of the terminal transmits the status report to the PDCP layer of the terminal to inform the transmission condition of the data.
In the LTE system, the process of establishing a call by the UE includes: a procedure of establishing a control plane link and a user plane link between the UE and the eNB, and a procedure of establishing a control plane link and a user plane link between the eNB and the core network. After the call process of the UE is established, control plane data between the eNB and the core network is carried through connection established between the eNB and an MME in the core network, and user plane data between the eNB and the core network is carried through an evolved Radio Access Bearer (ERAB, E-UTRAN Radio Access Bearer) established between the eNB and an SGW in the core network; user plane Data between the eNB and the UE is carried by Data Radio Bearers (DRBs), each DRB is configured with an identifier, control plane Data is carried by Signaling Radio Bearers (SRBs), and each SRB is configured with an identifier.
Due to the shortage of frequency spectrum resources and the rapid increase of large-flow services of mobile users, the requirement of adopting high frequency points such as 3.5GHz for hot spot coverage is increasingly obvious, and nodes with low power become a new application scene so as to increase the throughput of users and enhance the mobile performance. However, due to the fact that signal attenuation of high frequency points is relatively severe, coverage area of a cell is relatively small, called a small cell, a base station to which the cell belongs is called a SeNB, and the base station to which the cell belongs is called a MeNB without co-site, and at present, a new enhancement scheme is sought by a plurality of companies and operators, and Dual Connectivity (Dual Connectivity) is one of the enhancement schemes. In the dual connectivity technique, as shown in fig. 3, the dual connectivity lower terminal may stay connected to more than two network nodes at the same time, but the control plane connection has a connection to only one of the cells, such as a macro cell. For example, when the UE is in the coverage of both cell 1 and cell 2, the eNB1 to which cell 1 belongs is a macro base station, and the eNB2 to which cell 2 belongs is a small cell base station, when the dual connectivity technology is adopted, the UE and the cell 1 maintain connection, such as control plane connection, and may also include user plane connection, and meanwhile, the UE and the cell 2 maintain connection, such as user plane connection, that is, the UE establishes radio bearers with both the cell 1 and the cell 2. In dual connectivity, in order to better balance the load between base stations and optimize cell resources to the maximum extent, split data radio bearers are introduced, and therefore, in dual connectivity, split data radio bearers and non-split data radio bearers exist. The non-data split radio bearer may exist only in the MeNB or the SeNB, and there are three types of data radio bearers in total, the data radio bearer existing only in the MeNB is abbreviated as MeNB bearer, the data radio bearer existing only in the SeNB is abbreviated as SeNB bearer, and the data radio bearer existing in both the MeNB and the SeNB is abbreviated as split bearer (split bearer). As shown in fig. 4, the PDCP layer is present on the MeNB, and the RLC and MAC layers, and the PHY layer are present on the MeNB and the SeNB, respectively, and on the terminal side, there are one PDCP layer, two RLC layers, MAC layer, and PHY layer, which respectively manage data buffer transmission and processing on the MeNB and the SeNB. For the split bearer, only downlink split is temporarily supported at present, uplink data is sent only through one base station, the sending base station is specified by upper layer signaling, meanwhile, in order to obtain shorter time delay or small path loss of the SeNB, the upper layer signaling can also change the uplink data sending from the base station to another base station, when the terminal receives an uplink data sending changing command, the terminal and the old uplink sending base station still have data to send or have data to be sent in a buffer area, in this case, the uplink data can not be sent to two base stations at the same time, and uplink data loss can be caused.
Aiming at the problem of how to reduce the uplink data loss when the dual-connection terminal in the related technology performs uplink data transmission change, no effective solution is provided at present.
Disclosure of Invention
The invention provides a modification scheme of an uplink bearer, aiming at solving the problem of how to reduce uplink data loss when a dual-connection terminal performs uplink data transmission modification.
According to an aspect of the present invention, a method for modifying an uplink bearer is provided, including: a terminal in double connection receives an uplink data sending node change command, wherein the uplink data sending node change command instructs the terminal to change the uplink data sent by a first uplink data sending node to be sent by a second uplink data sending node; the terminal continuously sends the existing part or all uplink data of the buffer zone of the Radio Link Control (RLC) layer and the Media Access Control (MAC) layer corresponding to the first uplink data sending node in the terminal through the first uplink data sending node; and the terminal clears the uplink data of the RLC layer and the MAC layer buffer zone corresponding to the first uplink data sending node.
Optionally, the part of uplink data of the radio link control RLC layer and the medium access control MAC layer buffer corresponding to the first uplink data transmission node includes: and the uplink data of the RLC layer and the MAC layer buffer area does not receive the data responded by the opposite terminal, or the uplink data of the RLC layer and the MAC layer buffer area needs to be retransmitted.
Optionally, the clearing, by the terminal, uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node includes: and the terminal starts timing when receiving the uplink data sending node change command, and empties uplink data of an RLC layer and an MAC layer buffer zone corresponding to the first uplink data sending node when preset time is reached.
Optionally, when the terminal receives an uplink data sending node change command, the method further includes: the terminal suspends the sending of the uplink data of the packet data convergence protocol PDCP layer buffer zone corresponding to the first uplink data sending node; when the predetermined time is reached, the method further comprises: and the terminal sends the uplink data which is not sent successfully in the PDCP layer buffer zone on the second uplink data sending node.
Optionally, the predetermined time is a default value or is specified by upper layer signaling.
Optionally, the receiving, by a terminal in dual connectivity, an uplink data sending node change command includes: the terminal receives the uplink data sending node change command sent by the first uplink data sending node; or, the terminal receives the uplink data sending node change command sent by the second uplink data sending node.
According to another aspect of the present invention, there is provided an apparatus for modifying an uplink bearer, including: the system comprises a receiving module, a sending module and a sending module, wherein the receiving module is used for receiving an uplink data sending node change command sent to a terminal in double connection, and the uplink data sending node change command instructs the terminal to change the uplink data sent by a first uplink data sending node to be sent by a second uplink data sending node; a sending module, configured to continue sending, by the first uplink data sending node, part or all of uplink data in a radio link control, RLC, layer and a media access control, MAC, layer buffer that correspond to the first uplink data sending node and already exist in the terminal; and the clearing module is used for clearing uplink data of the RLC layer and the MAC layer buffer zone corresponding to the first uplink data sending node in the terminal.
Optionally, the apparatus further comprises: and the timer is used for starting when the receiving module receives the uplink data sending node change command and triggering the emptying module when a preset time length is reached.
Optionally, the apparatus further comprises: a first suspension module, configured to suspend sending uplink buffer data of a packet data convergence protocol PDCP layer buffer corresponding to a first uplink data sending node when receiving an uplink data sending node change command; the sending module is further configured to send, on the second uplink data sending node, uplink data that has not been successfully sent in the PDCP layer buffer when the predetermined time length is reached.
Optionally, the part of uplink data of the radio link control RLC layer and the medium access control MAC layer buffer corresponding to the first uplink data transmission node includes: and the uplink data of the RLC layer and the MAC layer buffer area does not receive the data responded by the opposite terminal, or the uplink data of the RLC layer and the MAC layer buffer area needs to be retransmitted.
According to yet another aspect of the present invention, there is provided a terminal simultaneously connected to a plurality of network nodes, wherein the terminal comprises the above-mentioned apparatus.
By the invention, when the terminal receives the command of changing the uplink data sending node, the terminal continues to send part or all of the existing uplink data of the RLC layer and the MAC layer buffer zone corresponding to the uplink data sending node through the current uplink data sending node, and then clears the uplink data of the RLC layer and the MAC layer buffer zone corresponding to the uplink data sending node, thereby reducing the uplink data lost when the uplink data sending node is changed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of the overall architecture of an LTE system;
fig. 2 is a schematic diagram of a protocol architecture of a user plane between a UE and an eNB in an LTE system in the related art;
FIG. 3 is a schematic diagram of the overall architecture of a dual connectivity system;
FIG. 4 is a schematic diagram of a protocol architecture for partitioning the user plane between a UE and an eNB under a bearer;
fig. 5 is a flowchart of a method for modifying an uplink bearer according to an embodiment of the present invention;
fig. 6 is a structural diagram of an apparatus for modifying an uplink bearer according to an embodiment of the present invention;
FIG. 7 is a flow chart of the first embodiment;
FIG. 8 is a flowchart of a third embodiment;
FIG. 9 is a flowchart of a fourth embodiment.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
According to an embodiment of the present invention, a method for modifying an uplink bearer is provided.
Fig. 5 is a flowchart of a method for modifying an uplink bearer according to an embodiment of the present invention, and as shown in fig. 5, the method mainly includes the following steps:
step S502, a terminal in double connection receives an uplink data sending node change command, wherein the uplink data sending node change command instructs the terminal to change the uplink data sent by a first uplink data sending node to be sent by a second uplink data sending node.
In the embodiment of the present invention, the terminal is simultaneously connected to multiple network nodes (including the first uplink data transmitting node and the second uplink data transmitting node).
In a specific implementation process, the uplink data sending node change command may be sent by the first uplink data sending node or sent by the second uplink data sending node.
Step S504, the terminal continues to send, through the first uplink data sending node, part or all of the uplink data of the RLC layer and the MAC layer buffer area corresponding to the first uplink data sending node, which already exist in the terminal.
Wherein, the part of uplink data of the RLC layer and MAC layer buffer corresponding to the first uplink data transmitting node, which already exists in the terminal, may include: and the uplink data of the RLC layer and the MAC layer buffer area does not receive the data responded by the opposite terminal, and the data which needs to be retransmitted in the uplink data of the RLC layer and the MAC layer buffer area.
Step S506, the terminal clears the uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data transmitting node.
In an optional implementation manner of the embodiment of the present invention, a period of time may be reserved for sending existing uplink data of a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer buffer corresponding to the first uplink data sending node, and the terminal may start timing from when the uplink data sending node change command is received, and clear uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node until a predetermined time arrives.
In an optional implementation manner of the embodiment of the present invention, when the terminal receives an uplink data sending node change command, the method may further include: the terminal suspends the sending of the uplink data of a Packet Data Convergence Protocol (PDCP) layer buffer zone corresponding to the first uplink data sending node; when the predetermined time is reached, the method may further include: and the terminal sends the uplink data of the PDCP layer buffer zone on the second uplink data sending node.
In an optional implementation manner of the embodiment of the present invention, after receiving the uplink data sending node change command, the terminal may continue to send, through the original uplink data sending node, part or all of the uplink data in the RLC and MAC layer buffers corresponding to the original uplink data sending node, the uplink buffer data in the PDCP layer of the terminal is suspended for sending, the duration is specified, and the specified duration is up, the uplink buffer data in the PDCP layer of the terminal and the uplink data in the MAC layer buffers corresponding to the original uplink data sending node are changed for sending, and the uplink data in the RLC and MAC layer buffers corresponding to the original uplink data sending node is cleared.
Alternatively, the predetermined time may be a default value or may be specified by upper layer signaling.
In the embodiment of the present invention, the uplink data sending node may be configured according to the terminal, that is, uplink data of all the split data radio bearers on the terminal are sent by the same uplink data sending node, or send according to the split data radio bearers, that is, uplink data of a plurality of split data radio bearers on one terminal may be sent by different uplink data sending nodes.
According to the embodiment of the invention, the invention also provides a modification device of the uplink bearer.
Fig. 6 is a schematic structural diagram of an uplink bearer modification apparatus according to an embodiment of the present invention, and as shown in fig. 6, the apparatus mainly includes: a receiving module 610, configured to receive an uplink data sending node change command sent to a terminal in dual connectivity, where the uplink data sending node change command instructs the terminal to change uplink data in a first uplink data sending node to a second uplink data sending node for sending; a sending module 620, configured to continue sending, by the first uplink data sending node, part or all of uplink data in a radio link control, RLC, layer and a medium access control, MAC, layer buffer that already exist in the terminal and correspond to the first uplink data sending node; a clearing module 630, configured to clear uplink data in the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node in the terminal.
Optionally, the part of uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node includes: and the uplink data does not receive the data responded by the opposite terminal or the data needing to be retransmitted in the uplink data.
Optionally, the apparatus may further include: a timer, configured to start when the receiving module receives the uplink data sending node change command, and trigger the emptying module 630 when a predetermined time length is reached.
Optionally, the apparatus may further include: a first suspension module, configured to suspend sending uplink data of a packet data convergence protocol PDCP layer buffer corresponding to a first uplink data sending node when an uplink data sending node change command is received; the sending module 620 is further configured to send, at the second uplink data sending node, the uplink data in the PDCP layer buffer when the predetermined time length is reached.
Optionally, the uplink data sending node change command received by the receiving module 610 may be sent by a first uplink data sending node, or may be sent by a second uplink data sending node.
According to the embodiment of the present invention, a terminal is further provided, where the terminal is connected to multiple uplink data sending nodes at the same time, and the terminal includes the above uplink bearer modification apparatus.
By adopting the technical scheme provided by the embodiment of the invention, the uplink data needing to be discarded can be obviously reduced when the uplink data sending node is changed.
The technical solutions provided by the embodiments of the present invention are described below by specific examples.
In the following embodiments, the base station 1 is a macro base station and has 1 cell, i.e. cell 1, and the base station 2 is a small cell base station and has two cells, respectively cell 3 and cell 4. The buffers mentioned in the following embodiments are all on the terminal, i.e. there are buffers of RLC and MAC layers opposite to the base station 1 on the terminal, and there is only one buffer of PDCP layer corresponding to the base station 1, as shown in fig. 4, corresponding to the base station 2.
Example one
In this embodiment, the terminal establishes a connection with the cell 1, configures the cell 3 at the same time, establishes the data radio bearer identifier 1, and the data radio bearer 1 exists on the base station 1 and the base station 2 at the same time, and is a divided data radio bearer, and at the same time, the base station 1 notifies the terminal, and the uplink data transmission of all the divided data radio bearers is performed through the base station 1, and at this time, only one divided radio data bearer is provided, and the uplink data transmission is performed through the base station 1.
Fig. 7 is a flowchart illustrating a change of an uplink data sending node in this embodiment, and as shown in fig. 7, the method mainly includes the following steps:
in step 701, in the split radio bearer uplink data transmission, as the uplink load of the base station 1 increases, the base station 1 determines to send the uplink data of the data radio bearer 1 to the base station 2, and sends an SeNB modification request to the base station 2, where the request may carry configuration information of the current data radio bearer 1 such as a data bearer identifier, and may also carry information that the uplink data of the data radio bearer 1 needs to be sent and modified to the base station 2.
Step 702, the base station 2 reserves resources for the data radio bearer 1 according to the current actual situation, and responds to the SeNB modification request response to the base station 1, where the response may include the following: and agreeing to modify, configuring the related configuration of the data radio bearer 1 such as data bearer identification, changing the uplink data transmission of the data radio bearer 1 to the base station 2, and the like.
Step 703, the base station 1 receives the response from the base station 2, sends a data bearer modification request to the terminal, where the data bearer modification request is included in the RRC reconfiguration command and carries configuration information of the data radio bearer 1, such as a data bearer identifier, changes the uplink data transmission of the data radio bearer 1 to the base station 2, and notifies the terminal, and after receiving the command, the time length for continuing to transmit the uplink data in the buffer on the old base station is 8ms at this time.
Step 704, the terminal receives the reconfiguration, starts 8ms timing according to the indication of the base station 1, continues to send the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 1, suspends sending the uplink data of the data radio bearer 1 in the PDCP buffer area, and sends a response to the base station 1 to complete bearer modification.
Step 705, the base station 1 receives the response of completing the bearer modification of the terminal, and responds to the base station 2 that the reconfiguration of the SeNB terminal is completed, wherein the step 705 and the step 706 have no time precedence relationship in execution.
Step 706, appointing time in this embodiment to be 8ms, clearing the uplink data of the RLC and MAC buffer data radio bearer 1 corresponding to the base station 1, and continuing to send the uplink data of the PDCP buffer data radio bearer 1 to the base station 2.
Step 707, the uplink data of the data radio bearer 1 is sent through the base station 2, and the normal application is newly configured.
In the above step 703, the indication of 8ms may be through direct time indication, or through an enumeration type, one of several times is selected, for example, 8ms, 10ms, and 12ms, and one of the times is selected to be configured to the terminal, or the time is default, that is, 8ms, and is not configurable.
Example two
In this embodiment, the terminal establishes a connection with the cell 1, configures the cell 3, establishes the data radio bearer identifier 1 and the data radio bearer 2, and the data radio bearers 1 and 2 exist on the base station 1 and the base station 2 at the same time and are both divided data radio bearers, and meanwhile, the base station 1 notifies the terminal, and the uplink data transmission of the divided data radio bearer 1 is performed through the base station 1, and the uplink data transmission of the divided data radio bearer 2 is performed through the base station 2.
The flow of the change of the uplink data sending node in this embodiment is similar to that in the first embodiment, and mainly includes the following steps:
the method comprises the following steps: as the uplink load of the base station 1 increases, the base station 1 decides to send the uplink data of the data radio bearer 1 to the base station 2, and sends an SeNB modification request to the base station 2, which may carry configuration information of the current data radio bearer 1 such as a data bearer identifier, and may also carry the uplink data of the data radio bearer 1 to be sent and modified to the base station 2.
Step two: the base station 2 reserves resources for the data radio bearer 1 according to the current actual situation, and responds to the SeNB modification request response to the base station 1, where the response may include the following: and agreeing to modify, configuring the related configuration of the data radio bearer 1 such as data bearer identification, changing the uplink data transmission of the data radio bearer 1 to the base station 2, and the like.
Step three: the base station 1 receives the response of the base station 2, sends a data bearer modification request to the terminal, contains the configuration information of the data radio bearer 1 such as a data bearer identifier in the RRC reconfiguration command, changes the uplink data transmission of the data radio bearer 1 to the base station 2, and notifies the terminal, and after receiving the command, the time length for continuously transmitting the uplink data in the buffer on the old base station is 8ms at this time.
Step four: the terminal receives the reconfiguration, starts 8ms timing according to the instruction of the base station 1, continues to send the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 1, suspends sending the uplink data of the data radio bearer 1 in the PDCP buffer area, responds to the base station 1 to complete bearer modification, and does not influence the data sending of the data radio bearer 2.
Step five: and the base station 1 receives the response of finishing the modification of the bearing of the terminal and responds that the reconfiguration of the SeNB terminal is finished to the base station 2, and the step has no time precedence with the step six.
Step six: the designated time is 8ms, the embodiment clears the uplink data of the RLC and MAC buffer data radio bearer 1 corresponding to the base station 1, and continues to send the uplink data of the PDCP buffer data radio bearer 1 to the base station 2, so far, the new configuration of the data radio bearer 1 is normally applied, and the data sending of the data radio bearer 2 is not affected.
EXAMPLE III
In this embodiment, the terminal establishes a connection with the cell 1, configures the cell 3 at the same time, establishes the data radio bearer identifier 1, and the data radio bearer 1 exists on both the base station 1 and the base station 2, and is a split data radio bearer, and meanwhile, the base station 1 notifies the terminal that the uplink data transmission is performed through the base station 2.
Fig. 8 is a flowchart of changing an uplink data sending node in this embodiment, and as shown in fig. 8, the method mainly includes the following steps:
step 801, split radio bearer uplink data transmission, and base station 1 decides to move data radio bearer 1 uplink data transmission to base station 1 due to base station 2 load increase. In this case, since the base station 2 deletes the uplink data transmission of the data radio bearer 1, it is not necessary to perform negotiation with the base station 2.
Step 802, the base station 1 sends a data bearer modification request to the terminal, where the request is included in the RRC reconfiguration command and carries configuration information of the data radio bearer 1, such as a data bearer identifier, and changes uplink data transmission of the data radio bearer 2 to the base station 1, and notifies the terminal, and after receiving the command, the length of time for continuing to send uplink data in the buffer on the old base station is 10ms at this time.
Step 803, the terminal receives the reconfiguration, starts 10ms timing according to the instruction of the base station 1, continues to send the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 2, suspends sending the uplink data of the data radio bearer 1 in the PDCP buffer area, and responds to the base station 1 to complete the bearer modification response.
Step 804, the base station 1 receives the response of the completion of the bearer modification of the terminal, and responds to the completion of the reconfiguration of the SeNB terminal to the base station 2, and the step 805 have no time precedence in execution.
Step 805, appointing time in this embodiment to be 10ms, clearing the RLC and MAC buffer corresponding to the base station 2 for the uplink data of the data radio bearer 1, and continuing to send the uplink data of the data radio bearer 1 in the PDCP buffer to the base station 1.
Step 806, the uplink data of the data radio bearer 1 is sent through the base station 1, and the new configuration of the data radio bearer 1 is normally applied.
Example four
In this embodiment, the terminal establishes a connection with the cell 1, configures the cell 3 at the same time, establishes the data radio bearer identifier 1, and the data radio bearer 1 exists on both the base station 1 and the base station 2, and is a split data radio bearer, and meanwhile, the base station 1 notifies the terminal that the uplink data transmission is performed through the base station 2.
Fig. 9 is a flowchart illustrating a change of an uplink data sending node in this embodiment, and as shown in fig. 9, the method mainly includes the following steps: in step 901, the radio bearer uplink data transmission is split, and the base station 1 decides to move the data radio bearer 1 uplink data transmission to the base station 1 due to the increased load of the base station 2. In this case, since the base station 2 deletes the uplink data transmission of the data radio bearer 1, it is not necessary to perform negotiation with the base station 2.
Step 902, the base station 1 sends a data bearer modification request to the terminal, which is included in the RRC reconfiguration command and carries configuration information of the data radio bearer 1, such as a data bearer identifier, deletes the data radio bearer 1 on the base station 2, and notifies the terminal, and after receiving the command, the time length for continuing sending uplink data in the buffer on the old base station is 10ms at this time.
Step 903, the terminal receives the reconfiguration, starts 10ms timing according to the instruction of the base station 1, continues to send the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 2, suspends sending the uplink data of the data radio bearer 1 in the PDCP buffer area, and responds to the base station 1 to complete the bearer modification response.
Step 904, the base station 1 receives the response of the completion of the bearer modification of the terminal, and responds to the completion of the reconfiguration of the SeNB terminal to the base station 2, and the step 905 have no time precedence in execution.
Step 905, appointing time in this embodiment to be 10ms, deleting the data radio bearer 1 on the base station 2, and continuing to send the uplink data of the data radio bearer 1 in the PDCP buffer to the base station 1.
Step 906, the uplink data of the data radio bearer 1 is sent through the base station 1, and the new configuration of the data radio bearer 1 is normally applied.
From the above description, it can be seen that, in the embodiment of the present invention, after receiving the uplink data sending node change command, the terminal may continue to send uplink data in the RLC and MAC layer buffers corresponding to the original uplink data sending node through the original uplink data sending node, the uplink buffer data in the PDCP layer of the terminal and the new uplink data are suspended for sending, the duration is specified, and when the specified duration is reached, the uplink buffer data in the PDCP layer of the terminal and the new uplink data are changed to the new uplink data sending node for sending, and the uplink data in the RLC and MAC layer buffers corresponding to the original uplink data sending node are cleared, so that uplink data lost when the uplink data sending node is changed can be reduced.
Example five:
in this embodiment, the terminal establishes a connection with the cell 1, configures the cell 3, establishes the data radio bearer identifier 1 and the data radio bearer 2, and the data radio bearers 1 and 2 exist on the base station 1 and the base station 2 at the same time and are both divided data radio bearers, and meanwhile, the base station 1 notifies the terminal, and the uplink data transmission of the divided data radio bearer 1 is performed through the base station 1, and the uplink data transmission of the divided data radio bearer 2 is performed through the base station 2.
The flow of the change of the uplink data sending node in this embodiment is similar to that in the first embodiment, and mainly includes the following steps:
the method comprises the following steps: as the uplink load of the base station 1 increases, the base station 1 decides to send the uplink data of the data radio bearer 1 to the base station 2, and sends an SeNB modification request to the base station 2, which may carry configuration information of the current data radio bearer 1 such as a data bearer identifier, and may also carry the uplink data of the data radio bearer 1 to be sent and modified to the base station 2.
Step two: the base station 2 reserves resources for the data radio bearer 1 according to the current actual situation, and responds to the SeNB modification request response to the base station 1, where the response may include the following: and agreeing to modify, configuring the related configuration of the data radio bearer 1 such as data bearer identification, changing the uplink data transmission of the data radio bearer 1 to the base station 2, and the like.
Step three: the base station 1 receives the response of the base station 2, sends a data bearer modification request to the terminal, is contained in an RRC reconfiguration command, carries configuration information of the data radio bearer 1 such as a data bearer identifier, modifies uplink data transmission of the data radio bearer 1 to the base station 2, and notifies the terminal at the same time, after receiving the command, the time length for suspending the transmission of the uplink data on the old base station is 8ms at this time, all newly transmitted data are suspended, including the PDCP corresponding to the base station 1, the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas, only the uplink data of the data radio bearer 1 in the buffer areas are allowed to be transmitted to the terminal through a physical layer, and the data transmission waiting for a response continues.
Step four: the terminal receives the reconfiguration, starts 8ms timing according to the instruction of the base station 1, suspends new sending of the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 1, suspends new sending of the uplink data of the data radio bearer 1 in the PDCP buffer areas, responds to the base station 1 to complete bearer modification response, the data sending of the data radio bearer 2 is not affected, and the data sending condition is shown in Table 1. Where PDCP PDUs refer to data already in the PDCP buffer, RLC PDUs refer to data already in the RLC buffer, and MAC PDUs refer to data already in the MAC buffer, it is possible that the same data packet, such as PDCP PDU2, already sent to the RLC layer, may be included in RLC PDU 1. I.e., the 8ms timer is started, only RLC PDU4, MAC PDU2, and MAC PDU4, which can continue the transmission process.
Table 1.
Step five: and the base station 1 receives the response of finishing the modification of the bearing of the terminal and responds that the reconfiguration of the SeNB terminal is finished to the base station 2, and the step has no time precedence with the step six.
Step six: the designated time is 8ms, the uplink data of the data radio bearer 1 in the RLC and MAC buffer areas corresponding to the base station 1 is cleared, the terminal sends the uplink data of the data radio bearer 1 in the PDCP buffer area, which is not successfully sent, to the base station 2 according to the status report of the bottom RLC, and at this time, the uplink data are PDCP PDU1, PDU2 and PDU4, so far, the new configuration of the data radio bearer 1 is normally applied, and the data sending of the data radio bearer 2 is not affected.
In this embodiment, the processing may be relatively simple, and after the timing start for 8ms, only the RLC layer and the MAC layer continue to send the data that the peer end does not receive the response, such as the RLC PDU2 and the MAC PDU2, that is, only the two responses are received, and whether to process the data subsequently is determined according to the response message. No other peer that receives either an ACK or a NACK is sent on. Thus, the base station does not repeat receiving the same data and perform additional processing.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A method for modifying an uplink bearer, comprising:
a terminal in double connection receives an uplink data sending node change command, wherein the uplink data sending node change command instructs the terminal to change the uplink data sent by a first uplink data sending node to be sent by a second uplink data sending node;
the terminal continuously sends the existing part or all uplink data of the buffer zone of the Radio Link Control (RLC) layer and the Media Access Control (MAC) layer corresponding to the first uplink data sending node in the terminal through the first uplink data sending node;
and the terminal clears the uplink data of the RLC layer and the MAC layer buffer zone corresponding to the first uplink data sending node.
2. The method of claim 1, wherein the part of uplink data of the Radio Link Control (RLC) layer and the Medium Access Control (MAC) layer buffer corresponding to the first uplink data transmission node comprises: and the uplink data of the RLC layer and the MAC layer buffer area does not receive the data responded by the opposite terminal, or the uplink data of the RLC layer and the MAC layer buffer area needs to be retransmitted.
3. The method of claim 1, wherein the emptying, by the terminal, uplink data of RLC layer and MAC layer buffers corresponding to the first uplink data transmission node comprises: and the terminal starts timing when receiving the uplink data sending node change command, and empties uplink data of an RLC layer and an MAC layer buffer zone corresponding to the first uplink data sending node when preset time is reached.
4. The method of claim 3,
when the terminal receives an uplink data sending node change command, the method further comprises the following steps: the terminal suspends the sending of the uplink data of the packet data convergence protocol PDCP layer buffer zone corresponding to the first uplink data sending node;
when the predetermined time is reached, the method further comprises: and the terminal sends the uplink data which is not sent successfully in the PDCP layer buffer zone on the second uplink data sending node.
5. The method according to claim 3 or 4, wherein the predetermined time is a default value or is specified by upper layer signaling.
6. The method according to any one of claims 1 to 3, wherein the receiving of the uplink data sending node change command by the terminal in the dual connection comprises:
the terminal receives the uplink data sending node change command sent by the first uplink data sending node; or
And the terminal receives the uplink data sending node change command sent by the second uplink data sending node.
7. An apparatus for modifying an uplink bearer, comprising:
the system comprises a receiving module, a sending module and a sending module, wherein the receiving module is used for receiving an uplink data sending node change command sent to a terminal in double connection, and the uplink data sending node change command instructs the terminal to change the uplink data sent by a first uplink data sending node to be sent by a second uplink data sending node;
a sending module, configured to continue sending, by the first uplink data sending node, part or all of uplink data in a radio link control, RLC, layer and a media access control, MAC, layer buffer that correspond to the first uplink data sending node and already exist in the terminal;
and the clearing module is used for clearing uplink data of the RLC layer and the MAC layer buffer zone corresponding to the first uplink data sending node in the terminal.
8. The apparatus of claim 7, further comprising: and the timer is used for starting when the receiving module receives the uplink data sending node change command and triggering the emptying module when a preset time length is reached.
9. The apparatus of claim 8,
the device further comprises: a first suspension module, configured to suspend sending uplink buffer data of a packet data convergence protocol PDCP layer buffer corresponding to a first uplink data sending node when receiving an uplink data sending node change command;
the sending module is further configured to send, on the second uplink data sending node, uplink data that has not been successfully sent in the PDCP layer buffer when the predetermined time length is reached.
10. The apparatus according to any of claims 7-9, wherein the part of uplink data of the radio link control, RLC, layer and medium access control, MAC, layer buffer corresponding to the first uplink data transmitting node comprises: and the uplink data of the RLC layer and the MAC layer buffer area does not receive the data responded by the opposite terminal, or the uplink data of the RLC layer and the MAC layer buffer area needs to be retransmitted.
11. A terminal, characterized in that the terminal is simultaneously connected to a plurality of network nodes, wherein the terminal comprises the apparatus of any of claims 7 to 10.
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| CN201410363981.6A CN105323852B (en) | 2014-07-28 | 2014-07-28 | Uplink bearer modification method and device |
| PCT/CN2014/092799 WO2015117481A1 (en) | 2014-07-28 | 2014-12-02 | Method and device for modifying uplink bearer |
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| CN201410363981.6A CN105323852B (en) | 2014-07-28 | 2014-07-28 | Uplink bearer modification method and device |
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| CN108702649B (en) * | 2016-04-15 | 2022-01-11 | 富士通株式会社 | Transmission device and method for status indication and communication system |
| WO2017199789A1 (en) * | 2016-05-20 | 2017-11-23 | 株式会社Ｎｔｔドコモ | User equipment, base station and signal transmission method |
| US11234261B2 (en) | 2017-09-22 | 2022-01-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data processing method and related device |
| BR112020008324A2 (en) * | 2017-11-15 | 2020-10-20 | Mitsubishi Electric Corporation | communication system, communication terminal device and communication node |
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