CN109246848B - RLC entity reestablishment method and device - Google Patents
RLC entity reestablishment method and device Download PDFInfo
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- CN109246848B CN109246848B CN201710309715.9A CN201710309715A CN109246848B CN 109246848 B CN109246848 B CN 109246848B CN 201710309715 A CN201710309715 A CN 201710309715A CN 109246848 B CN109246848 B CN 109246848B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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Abstract
The invention discloses a reestablishment method and a reestablishment device of an RLC entity, wherein the MAC entity of network equipment sends an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching, if the MAC entity of the network equipment receives a confirmation message fed back by the UE and receiving the RRC connection reconfiguration message, the MAC entity of the network equipment sends reestablishment indication information to the RLC entity of the network equipment, and the RLC entity of the network equipment executes reestablishment with the UE after receiving the reestablishment indication information so as to solve the problems of reduced communication rate and increased transmission delay caused by inconsistent receiving windows caused by inconsistent RLC entity execution time of an eNB side and the UE side when the network equipment decides that the UE needs to perform cell switching and RRC connection reestablishment.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a Radio Link Control (RLC) entity reestablishment method and apparatus.
Background
User Equipment (UE) in a Long Term Evolution (LTE) system communicates with an evolved Node B (eNB) through an air interface protocol. The air interface protocol is functionally divided into a user plane protocol stack and a control plane protocol stack, fig. 1 shows a schematic diagram of the user plane protocol stack between an eNB and a UE in an LTE system, and as shown in fig. 1, the user plane protocol stack between the eNB and the UE includes L1: physical layer (PHY), L2: a Medium Access Control (MAC) layer, an RLC layer, and a Packet Data Convergence Protocol (PDCP) layer; fig. 2 shows a schematic diagram of a control plane protocol stack between an eNB and a UE in an LTE system, and as shown in fig. 2, the control plane protocol stack between the eNB and the UE includes L1: PHY, L2: MAC layer, RLC layer, PDCP layer, and L3: a Radio Resource Control (RRC) layer.
In the LTE system, the service provided by L2 to L3 is referred to as Radio Bearer (RB), and according to the Bearer content division, the RB may be divided into Data Radio Bearers (DRBs) and Signaling Radio Bearers (SRBs), where the DRBs and the SRBs except for SRB0 correspond to one PDCP entity in the PDCP layer, and each PDCP entity corresponds to one RLC entity. The RLC entities include three types, respectively: a Transparent Mode (TM) RLC entity, an Unacknowledged Mode (UM) RLC entity, and an Acknowledged Mode (AM) RLC entity, wherein each AM RLC entity is capable of processing uplink and downlink data and providing a reliable data transmission service using an Automatic retransmission request (ARQ) mechanism.
When a network device (e.g. eNB) decides that a UE needs to perform inter-cell handover and RRC connection reestablishment, an RLC entity between the UE and the eNB needs to perform re-establishment, and this procedure may instruct the RLC entity to perform re-establishment through a corresponding PDCP entity by a higher layer (e.g. RRC layer) on the eNB side. The following description will be made in detail by taking an example in which the AM RLC entity performs re-establishment.
At present, the higher layer of the network device generally sends an RRC connection reconfiguration message over the air interface to notify the AM RLC entity on the UE side to perform a re-establishment operation. Since the RRC connection reconfiguration message is sent to the MAC entity through the AM RLC entity corresponding to the downlink SRB, and then sent to the UE after MAC scheduling, if the RRC connection reconfiguration message does not obtain a chance to schedule a MAC resource, the RRC reconfiguration message cannot be sent to the UE, the AM RLC entity on the UE side cannot perform the reestablishment operation, but if the AM RLC entity on the eNB side has performed the reestablishment operation, the receiving window corresponding to the AM RLC entity on the eNB side is not consistent with the receiving window corresponding to the AM RLC entity on the UE side, and if the UE continues to send a Protocol Data Unit (PDU) on the link corresponding to the DRB, the PDU received by the eNB does not satisfy the receiving window and cannot be combined into a complete Data segment to be discarded, thereby causing Data retransmission, reducing the communication rate and increasing the transmission delay, thereby affecting the user perception and the Performance index of the network (Performance Indicators, KPI).
Disclosure of Invention
The invention aims to provide a method and a device for reestablishing an RLC entity so as to solve the problems of reduction of communication rate and increase of transmission delay.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, a method for reestablishing an RLC entity is provided, where an MAC entity of a network device sends an RRC connection reconfiguration message including a handover message to a UE that needs to perform inter-cell handover, and if the MAC entity of the network device receives an acknowledgment message that the UE receives the RRC connection reconfiguration message and that is fed back by the UE, the MAC entity of the network device sends reestablishment indication information to the RLC entity of the network device, and the RLC entity of the network device performs reestablishment with the UE after receiving the reestablishment indication information.
Wherein the re-establishment indication information is used for indicating the RLC entity of the network equipment to execute re-establishment.
In the embodiment of the present invention, after the MAC entity of the network device receives the acknowledgement message of receiving the RRC connection reconfiguration message fed back by the UE, the MAC entity of the network device sends re-establishment indication information to the RLC entity of the network device, that is, the MAC entity triggers the RLC entity to perform re-establishment, and the RRC entity does not trigger the RLC entity to perform re-establishment any more, because the UE-side RLC entity is the re-establishment executed after receiving the RRC connection reconfiguration message sent by the network device, the re-establishment time of the network device-side and the UE-side RLC entity is approximately the same, and because the receiving windows after the re-establishment are consistent, if the UE continues to send PDUs on the link corresponding to the DRB at this time, the PDUs received by the eNB can be combined into a complete data segment and cannot be discarded, and further, data retransmission cannot be caused, so that the communication rate is increased and the transmission delay is reduced, thereby improving user perception and KPI.
Preferably, the re-establishing performed by the RLC entity of the network device specifically includes:
and after receiving the reestablishment indication information, the RLC entity of the network equipment executes reestablishment of a downlink between the RLC entity and the UE and cancels reestablishment of an uplink between the RLC entity and the UE.
Preferably, before the MAC entity of the network device sends the RRC connection reconfiguration message including the handover message to the UE requiring inter-cell handover, the method further includes:
and the network equipment starts the signaling identification function of the MAC entity and the RLC entity, and the MAC entity and the RLC entity which start the signaling identification function have the signaling identification function of identifying that the RRC connection reconfiguration message contains the switching message.
Preferably, before the MAC entity of the network device sends the RRC connection reconfiguration message including the handover message to the UE requiring inter-cell handover, the method further includes:
and the RRC entity of the network equipment sends signaling identification indication information to the MAC entity of the network equipment and the RLC entity of the network equipment, wherein the signaling identification indication information is used for indicating the MAC entity of the network equipment and the RLC entity of the network equipment to identify the switching message contained in the RRC connection reconfiguration message.
Preferably, the RLC entity is an AM RLC entity.
In a second aspect, a device for re-establishing an RLC entity is provided, where the device is a network device, and specifically includes:
a sending unit, configured to send a radio resource control RRC connection reconfiguration message including a handover message to a user equipment UE that needs to perform inter-cell handover through a media access control MAC entity;
and the processing unit is used for sending reestablishment indication information to a Radio Link Control (RLC) entity through the MAC entity when the MAC entity receives a confirmation message fed back by the UE and receiving the RRC connection reconfiguration message sent by the sending unit, wherein the reestablishment indication information is used for indicating the RLC entity to execute reestablishment, and after the RLC entity receives the reestablishment indication information, the RLC entity executes reestablishment with the UE.
Preferably, the processing unit is further configured to:
and after receiving the reestablishment indication information, the RLC entity executes reestablishment of a downlink between the RLC entity and the UE and cancels reestablishment of an uplink between the RLC entity and the UE.
Preferably, the processing unit is further configured to:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, starting signaling identification functions of the MAC entity and the RLC entity, wherein the MAC entity and the RLC entity after starting the signaling identification functions have the signaling identification function of identifying the switching message contained in the RRC connection reconfiguration message.
Preferably, the processing unit is further configured to:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, sending signaling identification indication information to the MAC entity and the RLC entity through the RRC entity, wherein the signaling identification indication information is used for indicating the MAC entity and the RLC entity to identify the switching message contained in the RRC connection reconfiguration message.
Preferably, the RLC entity is an AM RLC entity.
Drawings
Fig. 1 is a schematic diagram of a user plane protocol stack between an eNB and a UE in a conventional LTE system;
fig. 2 is a schematic diagram of a control plane protocol stack between an eNB and a UE in a conventional LTE system;
fig. 3 is a flowchart of a re-establishment method for an RLC entity according to an embodiment of the present invention;
fig. 4 is a flowchart of another RLC entity re-establishment method according to an embodiment of the present invention;
fig. 5A is a schematic diagram illustrating a conventional re-establishment of an RLC entity of an eNB;
FIG. 5B is a schematic diagram illustrating a conventional reconstruction cube of an RLC entity of a UE;
fig. 6 is a schematic diagram of a re-establishment cube of an RLC entity of an eNB according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an apparatus for re-establishing an RLC entity according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments, and not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems of reduction of communication rate and increase of transmission delay caused by inconsistent receiving windows due to inconsistent reestablishment time of RLC entities of an eNB side and a UE side when an eNB decides that the UE needs to perform cell switching and RRC connection reestablishment, the embodiment of the invention provides a reestablishment method of the RLC entities.
Fig. 3 is a flowchart of a re-establishment method for an RLC entity according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
s101: and the MAC entity of the network equipment sends an RRC connection reconfiguration message containing a switching message to the UE needing to carry out the inter-cell switching.
In the embodiment of the invention, when network equipment decides that UE in a cell needs to perform cell switching, the network equipment sends an RRC connection reconfiguration message containing a switching message to the UE needing to perform inter-cell switching through an MAC entity so as to indicate the UE to execute connection reestablishment, execute the RRC connection reestablishment for an RRC entity of the UE, and execute the reestablishment for an RLC entity of the UE.
S102: and if the MAC entity of the network equipment receives the confirmation message of receiving the RRC connection reconfiguration message fed back by the UE, the MAC entity of the network equipment sends reestablishment indication information to an RLC entity of the network equipment.
In the embodiment of the present invention, after receiving an RRC connection reconfiguration message sent by a network device, a UE sends an acknowledgement message that the RRC connection reconfiguration message has been received to the network device, and if an MAC entity of the network device receives the acknowledgement message that the RRC connection reconfiguration message is received and is fed back by the UE, the MAC entity of the network device sends re-establishment indication information to an RLC entity of the network device, where the re-establishment indication information is used to indicate the RLC entity of the network device to perform re-establishment.
S103: and after receiving the reestablishment indication information, the RLC entity of the network equipment executes reestablishment with the UE.
In the embodiment of the present invention, after receiving the re-establishment indication information, the RLC entity of the network device performs re-establishment, and after completing re-establishment, sends a re-establishment completion message to the PDCP entity of the network device, so as to indicate the PDCP entity of the network device that re-establishment is completed.
In the embodiment of the present invention, after the MAC entity of the network device receives the acknowledgement message of receiving the RRC connection reconfiguration message fed back by the UE, the MAC entity of the network device sends re-establishment indication information to the RLC entity of the network device, that is, the MAC entity triggers the RLC entity to perform re-establishment, and the RRC entity does not trigger the RLC entity to perform re-establishment any more, because the UE-side RLC entity is the re-establishment executed after receiving the RRC connection reconfiguration message sent by the network device, the time for the network device-side and the UE-side RLC entity to perform re-establishment is approximately the same, because the receiving windows after performing re-establishment are consistent, if the UE continues to send PDUs on the link corresponding to the DRB at this time, the PDUs received by the eNB can be combined into a complete data segment and cannot be discarded, and further, data retransmission cannot be caused, so that the communication rate is increased and the transmission delay is reduced, thereby improving user perception and KPI.
In the embodiment of the present invention, because the processing delay of the UE protocol layer may cause the uplink between the UE and the network device to still have data to be transmitted when the UE does not complete the inter-cell handover, the RLC entity of the network device in the embodiment of the present invention performs the downlink re-establishment and cancels the uplink re-establishment according to the re-establishment indication information, and at this time, the RLC entity of the network device cancels the uplink re-establishment, so that, even though there is still data to be transmitted on the uplink between the UE and the network device, the network device can still use the RLC entity to perform the uplink re-establishment within the receiving window before the uplink re-establishment, receive the uplink data transmitted by the UE, ensure that the uplink data transmitted by the UE does not lose packets, and avoid the problem of packet loss and retransmission of the uplink data after the UE performs the cell handover.
In the embodiment of the invention, another RLC entity reestablishment method is provided to avoid the problem of packet loss retransmission of uplink data after the UE performs cell switching.
Fig. 4 is a flowchart of another RLC entity reestablishment method according to an embodiment of the present invention, as shown in fig. 4, where S201 and S202 are the same as S101 and S102 in fig. 3, except that, after receiving the reestablishment indication information, the RLC entity of the network device in S203 performs downlink reestablishment and cancels uplink reestablishment. The RLC entity of the network equipment cancels the reestablishment of the uplink between the UE and the network equipment, so that the network equipment can still use the RLC entity to execute a receiving window before the uplink is reestablished to receive the uplink data sent by the UE even if data is still sent on the uplink between the UE and the network equipment when the UE does not complete the inter-cell switching, the uplink data sent by the UE are not lost, and the problem of packet loss retransmission of the uplink data after the UE performs the cell switching is solved.
In the embodiment of the invention, the MAC entity and the RLC entity which control the network equipment in the following two control modes have the function of identifying that the RRC connection reconfiguration message contains the switching message.
In a first control manner, before the MAC entity of the network device sends the RRC connection reconfiguration message including the handover message to the UE that needs to perform inter-cell handover, the network device starts the signaling identification function of the MAC entity and the RLC entity, so that the MAC entity and the RLC entity that start the signaling identification function have the signaling identification function of identifying that the RRC connection reconfiguration message includes the handover message, that is, the MAC entity and the RLC entity that start the signaling identification function can identify the handover message included in the RRC connection reconfiguration message. It should be noted that in the implementation of the present invention, the signaling identification function of the PDCP entity may also be started, so that the PDCP entity after starting the signaling identification function can also identify the handover message included in the RRC connection reconfiguration message.
In a second control manner, before the MAC entity of the network device sends an RRC connection reconfiguration message including a handover message to a UE that needs to perform inter-cell handover, the RRC entity of the network device sends signaling identification indication information to the MAC entity of the network device and the RLC entity of the network device, and instructs the MAC entity of the network device and the RLC entity of the network device to identify the handover message included in the RRC connection reconfiguration message through the signaling identification indication information. It should be noted that in the implementation of the present invention, the RRC entity of the network device may also send signaling identification indication information to the PDCP entity, so that the PDCP entity can also identify the handover message included in the RRC connection reconfiguration message.
It should be noted that, in the embodiment of the present invention, the RLC entity is an AM RLC entity.
In the embodiment of the present invention, a network device is taken as an eNB as an example below, and a conventional RLC entity re-establishment method and an RLC entity re-establishment method in the present invention are compared to describe RLC entity re-establishment in detail.
Fig. 5A shows a schematic view of a reconstruction cube of an RLC entity of an eNB in the prior art, as shown in fig. 5A, when an eNB determines that a UE in a cell needs to perform inter-cell handover, an RRC connection reconfiguration message is sent to a PDCP entity corresponding to an SRB at a control plane RRC entity, the PDCP entity corresponding to the SRB sends the received RRC connection reconfiguration message to the RLC entity after adding integrity protection information, and then the RLC entity corresponding to the SRB sends the received RRC connection reconfiguration message to an MAC entity through an RLC layer SDU, and then the MAC entity sends the RRC connection reconfiguration message to an MAC entity of the UE that needs to perform inter-cell handover at a scheduling time of the MAC entity by using a Hybrid Automatic Repeat reQuest (HARQ) process in an acknowledgement manner. And simultaneously, sending reestablishment indication information to a PDCP entity corresponding to the DRB by an RRC entity at a user plane, sending the received reestablishment indication information to an RLC entity corresponding to the DRB by the PDCP entity, indicating the RLC entity to execute reestablishment, carrying out reassembly out-of-order delivery on all the PDUs in a receiving buffer by the RLC entity, sending undelivered SDUs to a PDCP layer in an ascending order according to SDU Sequence Numbers (SNs), sending a reestablishment completion message to the PDCP entity corresponding to the DRB after the RLC entity completes reestablishment, and indicating that the RLC entity of the PDCP entity has completed reestablishment. The PDCP entity acquires SN of PDU in the sending buffer and the receiving buffer, informs the acquired SN of the RRC entity to transfer the SN to a target cell switched by UE, transfers uplink discontinuous SDU to the target cell, and transfers the PDU not confirmed by the downlink acquired UE to the target cell, so that the target cell can be sequentially transferred to a core network and sequentially send data to the UE.
Fig. 5B shows a schematic reestablishment cube of an RLC entity of a UE in the prior art, as shown in fig. 5B, when an eNB determines that the UE needs to perform inter-cell handover in a cell, after receiving an RRC connection reconfiguration message sent by the eNB, an MAC entity of a UE side sends an RRC connection reconfiguration response message to the eNB and sends the RRC connection reconfiguration message to an RLC entity corresponding to an SRB, the RLC entity sends a feedback message to the MAC entity and sends the received RRC connection reconfiguration message to a PDCP entity corresponding to the SRB, after the RRC connection reconfiguration message is processed by RLC and PDCP protocol layer entities, the PDCP entity sends the RRC connection reconfiguration response message to the RRC entity, and after receiving the RRC connection reconfiguration message, the RRC entity starts to perform a handover procedure, controls the RLC entity to perform re-establishment, and performs random access on a target eNB side to be handed over.
In the re-establishment method of the RLC entities of the existing eNB and UE shown in fig. 5A and 5B, after the RRC entity sends the RRC connection reconfiguration message to the PDCP entity corresponding to the SRB, the RRC entity sends the re-establishment instruction information to the PDCP entity corresponding to the DRB, and the PDCP entity corresponding to the DRB sends the received re-establishment instruction information to the RLC entity corresponding to the DRB, so as to instruct the RLC entity to perform re-establishment. Therefore, in this process, it is possible that the eNB side RLC entity has performed reestablishment, and the UE side has not performed reestablishment due to not receiving the RRC connection reconfiguration message, which results in inconsistency of the receiving windows of the eNB side and the UE side, at this time, if the UE continues to send uplink data on the uplink DRB, the received uplink data cannot be combined into a complete data segment because the received uplink data does not satisfy the receiving window, and the eNB discards the received uplink data, thereby causing data retransmission, so that the communication rate is reduced and the transmission delay is increased, thereby affecting the user perception and KPI. The re-establishment cubic of the RLC entity provided in the embodiment of the present invention can solve the above problems, and the re-establishment cubic of the RLC entity provided in the present invention will be described in detail below.
Fig. 6 shows a schematic view of a reestablishment cube of an RLC entity of an eNB according to the present invention, as shown in fig. 6, when the eNB determines that a UE in a cell needs to perform inter-cell handover, an RRC connection reconfiguration message is sent to a PDCP entity corresponding to an SRB by an RRC entity in a control plane, the PDCP entity corresponding to the SRB sends the received RRC connection reconfiguration message to the RLC entity through a PDCP layer SDU after adding integrity protection information to the RRC connection reconfiguration message, and then the RLC entity corresponding to the SRB sends the received RRC connection reconfiguration message to an MAC entity, indicates the MAC entity that is a handover message, and sends the RRC connection reconfiguration message to the MAC entity of the UE that needs to perform inter-cell handover by the MAC entity through an HARQ process in an acknowledgement manner at a scheduling time of the MAC entity. And in the user plane, after the MAC entity receives the confirmation message of receiving the RRC connection reconfiguration message fed back by the UE, the MAC entity sends reestablishment indication information to the RLC entity corresponding to the DRB, and the RLC entity executes reestablishment of a downlink and cancels reestablishment of an uplink according to the reestablishment indication information. The RLC entity carries out recombination disorder delivery on the PDU in the receiving buffer, the undelivered SDU is sent to the PDCP entity according to the SN ascending sequence, the uplink does not carry out PDU deletion and receiving window state variable adjustment, the PDCP entity obtains the SN of the PDU in the sending buffer and the receiving buffer, the obtained SN is informed to the RRC entity to be transmitted to a target cell switched by the UE, the uplink discontinuous SDU is transmitted to the target cell, the downlink unacquired PDU confirmed by the UE is transmitted to the target cell, and the target cell can be conveniently delivered to a core network in sequence and can send data to the UE in sequence. And informing the acquired SN to an RRC entity to transfer the SN to a target cell switched by the UE, transferring uplink discontinuous SDU to the target cell, and transferring the PDU not confirmed by the downlink acquired UE to the target cell, so that the target cell can be sequentially submitted to a core network and sequentially send data to the UE. For example, in the uplink transmission direction, assuming that the RLC entity performs re-establishment when the received data packets SN are 1, 2, and 4, the PDCP entity delivers the in-sequence data packets 1 and 2 to the core network, and delivers the out-of-sequence data packet 4 to the target cell after the UE is handed over, for the PDCP entity of the UE, the acknowledgement of the PDCP layer PDUs with data packets SN of 1, 2, and 4 is received, but 3 is the first data packet that is not acknowledged, and then the packets with the PDCP layer packet SN numbers of 3, 4, 5, and 6 are sequentially sent to the eNB of the target cell. The eNB of the target cell sequences and repeatedly detects the PDU of the PDCP layer according to the SN of the data packet, so that the SN sequence of the data packet received by the eNB of the target cell is as follows: 4,3,4,5,6. In this example, packet 4 belongs to a duplicate packet and is discarded. And the eNB of the target cell sends the sequenced non-repeated PDCP packets 3, 4, 5 and 6 to the core network. In the switching process, the PDCP entity configures a status report to indicate to the UE that a data packet with SN of 4 has been received, and the PDCP entity of the UE only needs to retransmit data packets with SNs of 3, 5, and 6.
In the embodiment of the invention, the RLC entity executes the reestablishment of the downlink according to the reestablishment indication information, cancels the reestablishment of the uplink, ensures that the eNB can also receive the uplink DRB data in an uplink receiving window which does not execute the reestablishment after the RLC entity executes the reestablishment, ensures that no packet is lost, and reduces the problem of transmission rate reduction caused by packet loss retransmission.
In the embodiment of the present invention, the UE side RLC entity re-establishment implemented in the manner of fig. 6 is the same as the UE side RLC entity re-establishment in fig. 5B, and therefore, the re-description is omitted.
The embodiment of the invention also provides a device for reestablishing the RLC entity, and the composition and the application of the device for reestablishing the RLC entity are described in detail below.
Fig. 7 is a schematic diagram of an apparatus for re-establishing an RLC entity according to an embodiment of the present invention, as shown in fig. 7, the apparatus includes a sending unit 101 and a processing unit 102, where:
a sending unit 101, configured to send a radio resource control RRC connection reconfiguration message including a handover message to a user equipment UE that needs to perform inter-cell handover through an MAC entity;
a processing unit 102, configured to send re-establishment indication information to an RLC entity through the MAC entity when the MAC entity receives a confirmation message fed back by the UE and receiving the RRC connection reconfiguration message sent by the sending unit 101, where the re-establishment indication information is used to indicate the RLC entity to perform re-establishment, and perform re-establishment with the UE after the RLC entity receives the re-establishment indication information.
It should be noted that, in the embodiment of the present invention, the RLC entity re-establishment apparatus is a network device, and the network device may be a base station.
In this embodiment of the present invention, the processing unit 102 is further configured to:
and after receiving the reestablishment indication information, the RLC entity executes reestablishment of a downlink between the RLC entity and the UE and cancels reestablishment of an uplink between the RLC entity and the UE.
In this embodiment of the present invention, the processing unit 102 is further configured to:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, starting signaling identification functions of the MAC entity and the RLC entity, wherein the MAC entity and the RLC entity after starting the signaling identification functions have the signaling identification function of identifying the switching message contained in the RRC connection reconfiguration message.
In this embodiment of the present invention, the processing unit 102 is further configured to:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, sending signaling identification indication information to the MAC entity and the RLC entity through the RRC entity, wherein the signaling identification indication information is used for indicating the MAC entity and the RLC entity to identify the switching message contained in the RRC connection reconfiguration message.
In the embodiment of the invention, the RLC entity is an AM RLC entity.
In the embodiment of the present invention, after the MAC entity of the network device receives the acknowledgement message of receiving the RRC connection reconfiguration message fed back by the UE, the MAC entity of the network device sends re-establishment indication information to the RLC entity of the network device, that is, the MAC entity triggers the RLC entity to perform re-establishment, and the RRC entity does not trigger the RLC entity to perform re-establishment any more, because the UE-side RLC entity performs re-establishment after receiving the RRC connection reconfiguration message sent by the network device, the time for performing re-establishment by the network device side and the UE-side RLC entity is approximately the same, and because the receiving windows after performing re-establishment are consistent, if the UE continues to send PDUs on the link corresponding to the DRB at this time, the PDUs received by the eNB can be combined into a complete data segment and cannot be discarded, and further, data retransmission cannot be caused, so that the communication rate is increased and the transmission delay is reduced, thereby improving user perception and KPI.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method for re-establishment of a radio link control, RLC, entity, comprising:
a Media Access Control (MAC) entity of network equipment sends a Radio Resource Control (RRC) connection reconfiguration message containing a switching message to User Equipment (UE) needing to carry out inter-cell switching;
if the MAC entity of the network equipment receives the confirmation message of receiving the RRC connection reconfiguration message fed back by the UE, the RLC entity of the network equipment executes the reestablishment with the UE;
the RLC entity of the network equipment performs reestablishment with the UE, and the reestablishment comprises the following steps:
and the RLC entity of the network equipment executes the reestablishment of the downlink between the network equipment and the UE and cancels the reestablishment of the uplink between the network equipment and the UE.
2. The method of claim 1, wherein before the MAC entity of the network device sends the RRC connection reconfiguration message including the handover message to the UE requiring inter-cell handover, the method further comprises:
and the network equipment starts the signaling identification function of the MAC entity and the RLC entity, and the MAC entity and the RLC entity which start the signaling identification function have the signaling identification function of identifying that the RRC connection reconfiguration message contains the switching message.
3. The method according to claim 1 or 2, wherein before the MAC entity of the network device sends the RRC connection reconfiguration message containing the handover message to the UE requiring inter-cell handover, the method further comprises:
and the RRC entity of the network equipment sends signaling identification indication information to the MAC entity of the network equipment and the RLC entity of the network equipment, wherein the signaling identification indication information is used for indicating the MAC entity of the network equipment and the RLC entity of the network equipment to identify the switching message contained in the RRC connection reconfiguration message.
4. The method of claim 1, wherein the RLC entity is an acknowledged mode, AM, RLC entity.
5. An apparatus for re-establishing a Radio Link Control (RLC) entity, the apparatus being a network device, comprising:
a sending unit, configured to send a radio resource control RRC connection reconfiguration message including a handover message to a user equipment UE that needs to perform inter-cell handover through a media access control MAC entity;
the processing unit is configured to control the RLC entity to perform reestablishment with the UE when the MAC entity receives a confirmation message fed back by the UE and receiving the RRC connection reconfiguration message sent by the sending unit;
wherein, when controlling the RLC entity to perform re-establishment with the UE, the processing unit is specifically configured to:
and controlling the RLC entity to execute the reestablishment of the downlink between the RLC entity and the UE and cancel the reestablishment of the uplink between the RLC entity and the UE.
6. The apparatus as recited in claim 5, said processing unit to further:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, starting signaling identification functions of the MAC entity and the RLC entity, wherein the MAC entity and the RLC entity after starting the signaling identification functions have the signaling identification function of identifying the switching message contained in the RRC connection reconfiguration message.
7. The apparatus of claim 5 or 6, wherein the processing unit is further to:
before sending an RRC connection reconfiguration message containing a switching message to UE needing to perform inter-cell switching through the MAC entity, sending signaling identification indication information to the MAC entity and the RLC entity through the RRC entity, wherein the signaling identification indication information is used for indicating the MAC entity and the RLC entity to identify the switching message contained in the RRC connection reconfiguration message.
8. The apparatus of claim 5, wherein the RLC entity is an Acknowledged Mode (AM) RLC entity.
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| CN111556537B (en) * | 2019-02-12 | 2021-06-11 | 大唐移动通信设备有限公司 | Message transmission method and device |
| CN111654887B (en) * | 2019-03-04 | 2023-03-31 | 中国移动通信有限公司研究院 | Switching method, switching device, related equipment and storage medium |
| CN112398587B (en) * | 2019-08-14 | 2022-06-07 | 中国移动通信有限公司研究院 | Control method, terminal and equipment for HARQ (hybrid automatic repeat request) process feedback |
| CN113141675A (en) * | 2020-01-20 | 2021-07-20 | 大唐移动通信设备有限公司 | RRC connection reconfiguration method and device |
| CN113207190B (en) * | 2020-02-03 | 2023-01-13 | 中国移动通信有限公司研究院 | Method, device and equipment for processing access layer IP packet |
| CN111601322B (en) * | 2020-03-31 | 2022-05-27 | 新华三技术有限公司成都分公司 | Method, device and network equipment for reconfiguring radio resource control connection |
| CN114070497B (en) * | 2020-07-30 | 2023-02-03 | 上海华为技术有限公司 | Method, equipment and storage medium for sending message |
| WO2022111455A1 (en) * | 2020-11-24 | 2022-06-02 | 中国移动通信有限公司研究院 | Data transmission method and apparatus, and related devices and storage medium |
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