WO2015117481A1 - Procédé et dispositif permettant de changer de support de liaison montante - Google Patents

Procédé et dispositif permettant de changer de support de liaison montante Download PDF

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Publication number
WO2015117481A1
WO2015117481A1 PCT/CN2014/092799 CN2014092799W WO2015117481A1 WO 2015117481 A1 WO2015117481 A1 WO 2015117481A1 CN 2014092799 W CN2014092799 W CN 2014092799W WO 2015117481 A1 WO2015117481 A1 WO 2015117481A1
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WIPO (PCT)
Prior art keywords
uplink data
sending node
terminal
data sending
uplink
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PCT/CN2014/092799
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English (en)
Chinese (zh)
Inventor
陈中明
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中兴通讯股份有限公司
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Publication of WO2015117481A1 publication Critical patent/WO2015117481A1/fr

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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
    • 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
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for modifying an uplink bearer.
  • the architecture of an LTE system mainly includes: a Mobility Management Entity (MME), a Serving GetWay (SGW), and a user equipment (UE, User Equipment) and base station (eNB, eNodeB).
  • MME Mobility Management Entity
  • SGW Serving GetWay
  • UE User Equipment
  • 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 (S1 for the control plane) interface
  • the interface between the eNB and the SGW is an S1-U interface, between the two eNBs.
  • the interface is the X2 interface.
  • 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.
  • the interface between the UE and the eNB in LTE is divided into the following protocol layers from the bottom to the top: physical layer (PHY), media access control (MAC) layer, and radio link control (Radio).
  • PHY physical layer
  • MAC media access control
  • Radio radio link control
  • the Link Control (referred to as the RLC) layer and the Packet Data Convergence Protocol (PDCP) layer referred to as the RLC
  • PDCP Packet Data Convergence Protocol
  • the PHY layer mainly transmits information to the MAC or higher layer through the transport channel; the MAC layer mainly provides data transmission and is responsible for radio resource allocation through the logical channel, and completes hybrid automatic repeat request (Hybrid ARQ, HARQ for short) and scheduling (Scheduling, for short SCH), priority processing and multiplexing demultiplexing (MUX) functions; the RLC layer mainly provides segmentation and retransmission services for users and control data; the PDCP layer mainly provides user data for RRC or user planes. transfer.
  • the uplink data transmission is performed in such a manner that the data first enters the PDCP layer buffer of the terminal side, then enters the RLC layer buffer, and then goes to the MAC layer, and then transmits to the base station through the PHY layer, and the PHY, MAC, RLC, and PDCP of the base station are sequentially Receiving, wherein the MAC of the base station receives the data, and the MAC layer of the terminal feeds back, and the RLC received by the base station sends a status report to the RLC layer of the terminal, and the RLC layer of the terminal sends a status report to the PDCP layer of the terminal, and the notification is sent.
  • the transmission of data wherein the MAC of the base station receives the data, and the MAC layer of the terminal feeds back, and the RLC received by the base station sends a status report to the RLC layer of the terminal, and the RLC layer of the terminal sends a status report to the PDCP layer of the terminal, and the notification is sent.
  • the process of establishing a call by the UE includes: establishing a control plane link and a user plane link between the UE and the eNB, and establishing a control plane link and a user plane link between the eNB and the core network. process.
  • the control plane data between the eNB and the core network is carried by the connection established between the eNB and the MME in the core network, and the user plane data between the eNB and the core network passes through the eNB and the core network.
  • An evolved radio access bearer (ERAB, E-UTRAN Radio Access Bearer) established between the SGWs;
  • the user plane data between the eNB and the UE is carried by a Data Radio Bearer (DRB).
  • DRB Data Radio Bearer
  • Each DRB is configured with an identifier
  • the control plane data is carried by a Signaling Radio Bearer (SRB).
  • SRB Signaling Radio Bearer
  • the dual connectivity terminal can remain connected to more than two network nodes at the same time, but the control plane connection is only connected to one of the cells, such as the macro cell.
  • the UE is in the coverage of the cell 1 and the cell 2 at the same time, the cell 1 home eNB1 is a macro base station, and the cell 2 home eNB 2 is a small cell base station.
  • the UE maintains a connection with the cell 1 as a control plane link.
  • the UE may also include a user plane link.
  • the UE maintains a connection with the cell 2, such as a user plane link, that is, the UE establishes a radio bearer with both the cell 1 and the cell 2.
  • the split data radio bearers are introduced. Therefore, in the dual connectivity, there are split data radio bearers and non-segment data radio bearers.
  • a non-data-segmented radio bearer may exist only in the MeNB or the SeNB, and there are three types of data radio bearers.
  • the data radio bearers existing only on the MeNB are referred to as MeNB bearers, and only the data radio bearers existing on the SeNB are referred to as SeNB bearers.
  • the data radio bearers existing on the MeNB and the SeNB are referred to as split bearers (split bearers). As shown in FIG.
  • the PDCP layer exists on the MeNB, and the RLC and the MAC and PHY layers exist on the MeNB and the SeNB respectively.
  • On the terminal side there is a layer of PDCP layer and two layers of RLC.
  • the MAC and PHY layers manage data buffer transmission and processing on the MeNB and the SeNB, respectively.
  • For the split bearer only downlink splitting is supported at present.
  • the uplink data is transmitted only through one base station.
  • the transmitting base station is specified by the upper layer signaling.
  • the MeNB also needs to obtain a shorter delay or the path loss of the SeNB is small, and the upper layer signaling is also
  • the uplink data transmission may be changed from the base station to another base station.
  • the terminal When the terminal receives the uplink data transmission change command, the terminal and the old uplink transmission base station still have data to be sent, or there is still data in the buffer ready for transmission. In this case, since the uplink data cannot simultaneously transmit data to the two base stations, uplink data loss may be caused.
  • the embodiment of the present invention provides a modification scheme of an uplink bearer, so as to at least solve the problem of how to reduce uplink data loss when a dual-connected terminal performs uplink data transmission change in the related art.
  • a method for modifying an uplink bearer including: receiving, by a terminal in a dual connection, an uplink data sending node change command, where the uplink data sending node changing command indicates that the terminal will uplink Data is sent by the first uplink data sending node to be sent by the second uplink data sending node; the terminal continues to send the already existing first uplink data transmission in the terminal by using the first uplink data sending node
  • the radio link corresponding to the node controls part or all of the uplink data of the RLC layer and the medium access control MAC layer buffer; the terminal clears the uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node.
  • the part of the uplink data of the radio link control RLC layer and the medium access control MAC layer buffer corresponding to the first uplink data sending node includes: the uplink data of the RLC layer and the MAC layer buffer are not yet Data that is received by the peer, or data that needs to be retransmitted in the uplink data of the RLC layer and the MAC layer buffer.
  • the terminal clears uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node, where the terminal starts timing when receiving the change command of the uplink data sending node, When the predetermined time arrives, the uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node is cleared.
  • the method further includes: the terminal suspending sending the uplink data of the packet data convergence protocol PDCP layer buffer corresponding to the first uplink data sending node. And when the predetermined time arrives, the method further includes: the terminal sending uplink data in the PDCP layer buffer that has not been successfully sent on the second uplink data sending node.
  • the predetermined time is a default value or is specified by upper layer signaling.
  • the terminal in the dual connection receives the uplink data sending node change command, where the terminal receives the uplink data sending node change command sent by the first uplink data sending node; or the terminal receives the The uplink data sending node change command sent by the second uplink data sending node.
  • an apparatus for modifying an uplink bearer comprising: a receiving module, configured to receive an uplink data sending node change command sent to a terminal in a dual connectivity, wherein the uplink data sending node The change command instructs the terminal to send the uplink data to the first uplink data sending node to send the change to the second uplink data sending node, and the sending module is configured to continue to send the terminal through the first uplink data sending node.
  • the clearing module is configured to clear the terminal and the first uplink The uplink data of the RLC layer and the MAC layer buffer corresponding to the data sending node.
  • the device further includes: a timer, configured to be started when the receiving module receives the uplink data sending node change command, and trigger the clearing module when a predetermined time period arrives.
  • a timer configured to be started when the receiving module receives the uplink data sending node change command, and trigger the clearing module when a predetermined time period arrives.
  • the device further includes: a first pause module, configured to pause sending the uplink of the packet data convergence protocol PDCP layer buffer corresponding to the first uplink data sending node when receiving the uplink data sending node change command Buffering data; the sending module is further configured to: when the predetermined duration arrives, send uplink data in the PDCP layer buffer that has not been successfully sent on the second uplink data sending node.
  • a first pause module configured to pause sending the uplink of the packet data convergence protocol PDCP layer buffer corresponding to the first uplink data sending node when receiving the uplink data sending node change command Buffering data
  • the sending module is further configured to: when the predetermined duration arrives, send uplink data in the PDCP layer buffer that has not been successfully sent on the second uplink data sending node.
  • the part of the uplink data of the radio link control RLC layer and the medium access control MAC layer buffer corresponding to the first uplink data sending node includes: the uplink data of the RLC layer and the MAC layer buffer are not yet Data that is received by the peer, or data that needs to be retransmitted in the uplink data of the RLC layer and the MAC layer buffer.
  • a terminal that is simultaneously connected to a plurality of network nodes, wherein the terminal includes the above-described apparatus.
  • the terminal when receiving the uplink data sending node change command, the terminal continues to send part or all of the uplink data of the existing RLC layer and the MAC layer buffer corresponding to the uplink data sending node by the current uplink data sending node. And then clearing the uplink data of the RLC layer and the MAC layer buffer corresponding to the uplink data sending node, so that the uplink data lost when the uplink data sending node is changed can be reduced.
  • 1 is a schematic diagram of an 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 dividing a 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 a modification apparatus of an uplink bearer according to an embodiment of the present invention.
  • Figure 7 is a flow chart of the first embodiment
  • Figure 8 is a flow chart of the third embodiment
  • Figure 9 is a flow chart of the fourth embodiment.
  • 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. As shown in FIG. 5, the method mainly includes the following steps:
  • Step S502 The terminal in the dual connectivity receives an uplink data sending node change command, where the uplink data sending node change command instructs the terminal to send uplink data to be sent by using the second uplink data sending node to the second uplink data sending node. node.
  • the terminal is simultaneously connected to multiple network nodes (including the first uplink data sending node and the second uplink data sending node).
  • the uplink data sending node change command may be sent by the first uplink data sending node, or may be sent by the second uplink data sending node.
  • Step S504 the terminal continues to send part or all of the uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node that is already existing in the terminal by using the first uplink data sending node.
  • the partial uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node that is already in the terminal may include: the uplink data of the RLC layer and the MAC layer buffer are not received yet.
  • Step S506 the terminal clears uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node.
  • a period of time may be reserved for transmitting an existing radio link control (RLC) layer and media access control (MAC) corresponding to the first uplink data sending node.
  • RLC radio link control
  • MAC media access control
  • the uplink data of the layer buffer, the terminal may start timing when receiving the uplink data sending node change command, and when the predetermined time arrives, clear the RLC layer and the MAC layer corresponding to the first uplink data sending node. Upstream data for the buffer.
  • the method when the terminal receives the uplink data sending node change command, the method may further include: the terminal suspending sending the packet corresponding to the first uplink data sending node The uplink data of the data buffering protocol (PDCP) layer buffer; when the predetermined time arrives, the method may further include: the terminal sending the uplink of the PDCP layer buffer on the second uplink data sending node data.
  • PDCP data buffering protocol
  • the terminal may continue to send the RLC and MAC layer buffers corresponding to the original uplink data sending node by using the original uplink data sending node.
  • the uplink buffer data of the PDCP layer of the terminal is suspended, the specified duration, the specified time is up, the uplink buffer data of the PDCP layer of the terminal is changed and sent to the new uplink data sending node for transmission, and the original uplink is cleared.
  • the uplink data of the corresponding RLC and MAC layer buffers on the data sending node.
  • the predetermined time may be a default value or may also be specified by upper layer signaling.
  • the uplink data sending node may be configured according to the terminal, that is, the uplink data of all the divided data radio bearers on the terminal are sent by the same uplink data sending node, or transmitted according to the split data radio bearer, that is, one terminal.
  • the uplink data transmission of multiple divided radio bearers may be sent through different uplink data sending nodes.
  • an apparatus for modifying an uplink bearer is further provided.
  • FIG. 6 is a schematic structural diagram of an apparatus for modifying an uplink bearer according to an embodiment of the present invention.
  • the apparatus mainly includes: a receiving module 610, configured to receive an uplink data sending node change command sent to a terminal in a dual connectivity.
  • the uplink data sending node change command instructs the terminal to change the uplink data of the first uplink data sending node to the second uplink data sending node, and the sending module 620 is configured to pass the first uplink data sending node.
  • the clearing module 630 is configured to clear the The uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node in the terminal.
  • the part of the uplink data of the RLC layer and the MAC layer buffer corresponding to the first uplink data sending node includes: data that has not received the peer response in the uplink data, or needs to be performed in the uplink data. Resent data.
  • the apparatus may further include: a timer, configured to be started when the receiving module receives the uplink data sending node change command, and trigger the clearing module 630 when a predetermined time period arrives.
  • a timer configured to be started when the receiving module receives the uplink data sending node change command, and trigger the clearing module 630 when a predetermined time period arrives.
  • the device may further include: a first pause module, configured to pause sending the packet data convergence protocol PDCP layer buffer corresponding to the first uplink data sending node when receiving the uplink data sending node change command Uplink data; the sending module 620 is further configured to: when the predetermined duration arrives, send uplink data of the PDCP layer buffer on the second uplink data sending node.
  • a first pause module configured to pause sending the packet data convergence protocol PDCP layer buffer corresponding to the first uplink data sending node when receiving the uplink data sending node change command Uplink data
  • the sending module 620 is further configured to: when the predetermined duration arrives, send uplink data of the PDCP layer buffer on the second uplink data sending node.
  • the uplink data sending node change command received by the receiving module 610 may be sent by the first uplink data sending node, or may be sent by the second uplink data sending node.
  • a terminal is further provided, where the terminal is connected to a plurality of uplink data sending nodes at the same time, wherein the terminal carries the modification device of the uplink bearer.
  • the uplink data sending node when the uplink data sending node is changed, the uplink data that needs to be discarded can be significantly reduced.
  • the base station 1 is a macro base station, and has one cell, that is, a cell 1
  • the base station 2 is a small cell base station, and has two cells, which are a cell 3 and a cell 4.
  • the buffers mentioned in the following embodiments are all on the terminal, that is, there are buffers of the base station 1 opposite to the RLC and MAC layers, and the base station 2 corresponds to the buffers of the RLC and MAC layers, and the buffer of the PDCP layer. Only one is corresponding to base station 1, as shown in Figure 4.
  • the terminal establishes a connection with the cell 1, and configures the cell 3, and establishes the data radio bearer identifier as 1, and the data radio bearer 1 exists on both the base station 1 and the base station 2, which is a split data radio bearer.
  • the base station 1 notifies the terminal that the uplink data transmission of all the split data radio bearers is performed by the base station 1. At this time, there is only one split radio data bearer, and the uplink data is transmitted through the base station 1.
  • FIG. 7 is a flowchart of the change of the uplink data sending node in this embodiment. As shown in FIG. 7, the method mainly includes the following steps:
  • the base station 1 decides to transmit the uplink data transmission of the data radio bearer 1 to the base station 2, and sends a SeNB modification request to the base station 2, where the request can carry the current
  • the configuration information of the data radio bearer 1, such as the data bearer identifier, may also carry the need to change the uplink data transmission of the data radio bearer 1 to the base station 2 or the like.
  • the base station 2 reserves resources for the data radio bearer 1 according to the current actual situation, and responds to the SeNB to modify the request response to the base station 1.
  • the response may include the following content: consent to modify, the related configuration of the data radio bearer 1, such as a data bearer identifier,
  • the uplink data transmission of the data radio bearer 1 is changed to the base station 2 or the like.
  • the base station 1 receives the response from the base station 2, and sends a data bearer modification request to the terminal, which is included in the RRC reconfiguration command, and carries the configuration information of the data radio bearer 1, such as a data bearer identifier, and sends the uplink data of the data radio bearer 1 Change to the base station 2, etc., and notify the terminal, after receiving the command, continue to send the uplink data in the buffer on the old base station for a length of 8 ms.
  • Step 704 The terminal receives the reconfiguration, starts the 8ms timing according to the indication of the base station 1, and continues to send the uplink data of the data radio bearer 1 in the RLC corresponding to the base station 1 and the MAC buffer to the base station 1, and the data radio bearer in the PDCP buffer.
  • the uplink data of 1 is suspended, and the base station 1 is responded to the bearer modification completion response.
  • Step 705 The base station 1 receives the bearer modification completion response of the terminal, and responds to the base station 2 to complete the reconfiguration of the SeNB terminal. Step 705 and step 706 have no chronological relationship.
  • Step 706 the time is specified to be 8 ms to clear the uplink data of the RLC and the MAC buffer data radio bearer 1 corresponding to the base station 1, and continue to send the uplink data of the radio bearer 1 of the PDCP buffer data to the base station 2.
  • step 707 the uplink data of the data radio bearer 1 is sent by the base station 2, and the new configuration is normally applied.
  • the indication of 8 ms can be directly indicated by time, or by enumeration type, one of several times, such as 8ms, 10ms, 12ms, one of the configurations is selected for the terminal, or the time is 8ms by default. Not configurable.
  • the terminal establishes a connection with the cell 1, and configures the cell 3, and establishes a data radio bearer identifier 1 and a data radio bearer 2, and the data radio bearers 1 and 2 exist on both the base station 1 and the base station 2, both of which are It is a divided data radio bearer.
  • the base station 1 notifies the terminal that the uplink data transmission of the split data radio bearer 1 is performed by the base station 1, and the uplink data transmission of the split data radio bearer 2 is performed by the base station 2.
  • the process of changing the uplink data sending node in this embodiment is similar to that in the first embodiment, and mainly includes the following steps:
  • Step 1 As the uplink load of the base station 1 increases, the base station 1 decides to transmit the uplink data transmission of the data radio bearer 1 to the base station 2, and sends the SeNB modification request to the base station 2, which can carry the configuration information of the current data radio bearer 1, such as the data bearer identifier. It is also possible to carry the change of the uplink data transmission of the data radio bearer 1 to the base station 2 and the like.
  • Step 2 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.
  • the response may include the following content: consent to modify, the relevant configuration of the data radio bearer 1, such as a data bearer identifier,
  • the uplink data transmission of the data radio bearer 1 is changed to the base station 2 or the like.
  • Step 3 The base station 1 receives the response from the base station 2, and sends a data bearer modification request to the terminal, which is included in the RRC reconfiguration command, and carries the configuration information of the data radio bearer 1, such as the data bearer identifier, and sends the uplink data of the data radio bearer 1 Change to the base station 2, etc., and notify the terminal, after receiving the command, continue to send the uplink data in the buffer on the old base station for a length of 8 ms.
  • Step 4 The terminal receives the reconfiguration, starts the 8ms timing according to the indication of the base station 1, and continues to send the uplink data of the data radio bearer 1 in the RLC corresponding to the base station 1 and the MAC buffer to the base station 1, and the data radio bearer in the PDCP buffer.
  • the uplink data of 1 is suspended, and the base station 1 is responded to the bearer modification completion response, and the data transmission of the data radio bearer 2 is not affected.
  • Step 5 The base station 1 receives the bearer modification completion response of the terminal, and responds to the base station 2 to complete the reconfiguration of the SeNB terminal. This step has no time relationship with the sixth step.
  • Step 6 Specifying the time is 8ms to clear the uplink data of the RLC and MAC buffer data radio bearer 1 corresponding to the base station 1 and continue to send the uplink data of the radio bearer 1 of the PDCP buffer data to the base station 2, and the data wirelessly
  • the new configuration of bearer 1 is normally applied, and the data transmission of data radio bearer 2 is not affected.
  • the terminal establishes a connection with the cell 1, and configures the cell 3, and establishes the data radio bearer identifier as 1, and the data radio bearer 1 exists on both the base station 1 and the base station 2, which is a split data radio bearer.
  • the base station 1 notifies the terminal that uplink data transmission is performed by the base station 2.
  • FIG. 8 is a flowchart of a modification of an uplink data sending node in this embodiment. As shown in FIG. 8, the method mainly includes the following steps:
  • step 801 the radio bearer uplink data transmission is split. Because the load of the base station 2 increases, the base station 1 decides to transmit the data radio bearer 1 uplink data transmission to the base station 1. At this time, since the uplink data transmission of the data radio bearer 1 is deleted on the base station 2, it is not necessary to negotiate with the base station 2.
  • 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, and changes the uplink data transmission of the data radio bearer 2 to the base station 1 and the like.
  • the terminal is notified that after receiving the command, the length of time for continuing to send uplink data in the buffer on the old base station is 10 ms.
  • Step 803 The terminal receives the reconfiguration, starts the 10ms timing according to the indication of the base station 1, and continues to send the uplink data of the data radio bearer 1 in the RLC corresponding to the base station 2 and the data buffer to the base station 2, and the data radio bearer in the PDCP buffer.
  • the uplink data of 1 is suspended, and the base station 1 is responsive to the bearer modification completion response.
  • Step 804 The base station 1 receives the bearer modification completion response of the terminal, and responds to the base station 2 to complete the reconfiguration of the SeNB terminal. This step has no chronological relationship with the execution of step 805.
  • Step 805 the time is specified to be 10 ms to clear the uplink data of the RLC and the MAC buffer data radio bearer 1 corresponding to the base station 2, and continue to send the uplink data of the radio bearer 1 of the PDCP buffer data to the base station 1.
  • Step 806 the uplink data of the data radio bearer 1 is sent by the base station 1, and the new configuration of the data radio bearer 1 is normally applied.
  • the terminal establishes a connection with the cell 1, and configures the cell 3, and establishes the data radio bearer identifier as 1, and the data radio bearer 1 exists on both the base station 1 and the base station 2, which is a split data radio bearer.
  • the base station 1 notifies the terminal that uplink data transmission is performed by the base station 2.
  • FIG. 9 is a flowchart of the modification of the uplink data sending node in the embodiment.
  • the method mainly includes the following steps: Step 901: splitting the radio bearer uplink data transmission, and the base station 1 determines to transmit the data radio bearer due to the increased load of the base station 2 1 The uplink data transmission is moved to the base station 1. At this time, since the base station 2 deletes the uplink data transmission of the data radio bearer 1, it is not necessary to negotiate with the base station 2.
  • the base station 1 sends a data bearer modification request to the terminal, which is included in the RRC reconfiguration command, carries the 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.
  • the length of time for continuing to send uplink data in the buffer on the old base station is 10 ms.
  • Step 903 The terminal receives the reconfiguration, starts the 10ms timing according to the instruction of the base station 1, and continues to send the uplink data of the data radio bearer 1 in the RLC corresponding to the base station 2 and the MAC buffer to the base station 2, and the data radio bearer in the PDCP buffer.
  • the uplink data of 1 is suspended, and the base station 1 is responsive to the bearer modification completion response.
  • step 904 the base station 1 receives the bearer modification completion response of the terminal, and responds to the base station 2 to complete the reconfiguration of the SeNB terminal. This step has no chronological relationship with the execution of step 905.
  • Step 905 the specified time is 10ms to, the data radio bearer 1 on the base station 2 is deleted, and the uplink data of the radio bearer 1 of the PDCP buffer data is continuously sent to the base station 1.
  • step 906 the uplink data of the data radio bearer 1 is sent by the base station 1, and the new configuration of the data radio bearer 1 is normally applied.
  • the terminal may continue to send the RLC corresponding to the original uplink data sending node by using the original uplink data sending node.
  • the uplink data of the MAC layer buffer, the uplink buffer data of the PDCP layer of the terminal, and the new uplink data are suspended, and the specified duration is reached.
  • the specified time is up, and the uplink buffer data of the PDCP layer of the terminal and the new uplink data are changed to the new uplink data.
  • the sending node sends the uplink data of the corresponding RLC and MAC layer buffers on the original uplink data sending node, so that the uplink data lost when the uplink data sending node is changed can be reduced.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • the terminal establishes a connection with the cell 1, and configures the cell 3, and establishes a data radio bearer identifier 1 and a data radio bearer 2, and the data radio bearers 1 and 2 exist on both the base station 1 and the base station 2, both of which are It is a divided data radio bearer.
  • the base station 1 notifies the terminal that the uplink data transmission of the split data radio bearer 1 is performed by the base station 1, and the uplink data transmission of the split data radio bearer 2 is performed by the base station 2.
  • the process of changing the uplink data sending node in this embodiment is similar to that in the first embodiment, and mainly includes the following steps:
  • Step 1 As the uplink load of the base station 1 increases, the base station 1 decides to transmit the uplink data transmission of the data radio bearer 1 to the base station 2, and sends the SeNB modification request to the base station 2, which can carry the configuration information of the current data radio bearer 1, such as the data bearer identifier. It is also possible to carry the change of the uplink data transmission of the data radio bearer 1 to the base station 2 and the like.
  • Step 2 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.
  • the response may include the following content: consent to modify, the relevant configuration of the data radio bearer 1, such as a data bearer identifier,
  • the uplink data transmission of the data radio bearer 1 is changed to the base station 2 or the like.
  • Step 3 The base station 1 receives the response from the base station 2, and sends a data bearer modification request to the terminal, which is included in the RRC reconfiguration command, and carries the configuration information of the data radio bearer 1, such as the data bearer identifier, and sends the uplink data of the data radio bearer 1 Change to the base station 2, etc., and notify the terminal.
  • the length of time for suspending the transmission of the uplink data on the old base station is 8 ms.
  • all newly transmitted data is suspended, including the PDCP corresponding to the base station 1, RLC.
  • the uplink data of the data radio bearer 1 in the MAC buffer only allows the uplink data of the data radio bearer 1 in these buffers to be sent to the terminal through the physical layer, and the data transmission waiting for the response continues.
  • Step 4 The terminal receives the reconfiguration, starts the 8ms timing according to the indication of the base station 1, pauses and sends the uplink data of the data radio bearer 1 in the RLC corresponding to the base station 1 and the MAC buffer to the base station 1, and the data in the PDCP buffer is wireless.
  • the uplink data field of bearer 1 pauses the new transmission, and the base station 1 responds to the bearer modification completion response, and the data transmission of the data radio bearer 2 is not affected, and the data transmission situation table 1 is performed.
  • the PDCP PDU refers to the data already in the PDCP buffer
  • the RLC PDU refers to the data already in the RLC buffer
  • the MAC PDU refers to the data already in the MAC buffer.
  • the data packet such as PDCP PDU2
  • the packet group may be in the RLC PDU1. That is, after the 8ms timing is started, only RLC PDU4, MAC PDU2 and 4 can continue to perform the transmission process.
  • Step 5 The base station 1 receives the bearer modification completion response of the terminal, and responds to the base station 2 to complete the reconfiguration of the SeNB terminal. This step has no time relationship with the sixth step.
  • Step 6 Specifying the time in this embodiment is 8 ms to clear the uplink data of the RLC and the MAC buffer data radio bearer 1 corresponding to the base station 1.
  • the terminal reports the PDCP buffer data radio bearer 1 that has not been successfully transmitted according to the status of the underlying RLC.
  • the uplink data is sent to the base station 2, which is PDCP1, 2, and 4. At this time, the new configuration of the data radio bearer 1 is normally applied, and the data transmission of the data radio bearer 2 is not affected.
  • the relatively simple processing may also be: after the 8ms timing is started, only the RLC layer and the MAC layer do not receive the data of the peer response, such as the RLC PDU2, the sending process of the MAC PDU2, that is, only the two are received. The response is determined according to the response message. Other receiving peers, whether ACK or NACK, will not continue to send. In this way, the base station does not repeatedly receive the same data for additional processing.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method and apparatus for modifying an uplink bearer provided by the embodiment of the present invention have the following beneficial effects: when receiving the change command of the uplink data sending node, the terminal continues to send the existing uplink data sending node by using the current uplink data sending node. Part or all of the RLC layer and the MAC layer buffer corresponding to the uplink data sending node The row data is then cleared, and the uplink data of the RLC layer and the MAC layer buffer corresponding to the uplink data sending node is cleared, thereby achieving the effect of reducing the uplink data lost when the uplink data sending node changes.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un procédé et un dispositif permettant de changer de support de liaison montante. Le procédé se déroule de la façon suivante : un terminal ayant une double connexion reçoit une instruction de changement de nœud d'envoi de données de liaison montante, cette instruction indiquant au terminal de ne plus envoyer les données de liaison montante par le biais d'un premier nœud d'envoi de données de liaison montante mais de passer par un second nœud d'envoi de données de liaison montante pour envoyer ces données ; le terminal envoie en continu une partie ou la totalité des données de liaison montante dans une zone tampon entre une couche de commande de liaison radio (RLC) et une couche de commande d'accès au support (MAC) correspondant au premier nœud d'envoi de données de liaison montante, qui existe déjà dans le terminal, par le biais du premier nœud d'envoi de données de liaison montante ; et le terminal supprime les données de liaison montante dans la zone tampon entre la couche RLC et la couche MAC correspondant au premier nœud d'envoi de données de liaison montante.
PCT/CN2014/092799 2014-07-28 2014-12-02 Procédé et dispositif permettant de changer de support de liaison montante WO2015117481A1 (fr)

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