CN107347199B - It is a kind of switching and its control method, device - Google Patents

It is a kind of switching and its control method, device Download PDF

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Publication number
CN107347199B
CN107347199B CN201610298909.9A CN201610298909A CN107347199B CN 107347199 B CN107347199 B CN 107347199B CN 201610298909 A CN201610298909 A CN 201610298909A CN 107347199 B CN107347199 B CN 107347199B
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processing node
switching
rlc
distributed processing
handover
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CN107347199A (en
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赵亚利
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

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

Abstract

This application discloses a kind of switching and its control methods, device to improve efficiency of transmission to shorten handover delay.A kind of method for handover control provided by the present application, comprising: centralized processing node determines that user equipment (UE) needs to carry out the switching of distributed processing node；The centralized processing node sends switching indication signaling to the UE, it is used to indicate the switching that the UE carries out distributed processing node, switching type is carried in the switching indication signaling indicates that information, the switching type instruction information are used to indicate the centralized processing node and carry out keeping the network node of the corresponding network side radio link control rlc layer ownership of the UE constant in distributed processing node handoff procedure in the UE.

Description

Switching and control method and device thereof
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for handover and control.
Background
The data transmission process of a Long Term Evolution (LTE) system in the prior art is introduced as follows:
in the existing LTE system, as shown in fig. 1, a user plane Protocol stack is used for Data transmission between a UE and a base station, and a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Media Access Control (MAC) layer, and a physical layer (PHY) are required to process Data at an air interface, and each layer completes different Data processing functions. The PDCP layer mainly performs security operations and Header Compression/decompression processing, such as ciphering and integrity protection, Header Compression (ROHC) Compression/decompression, and the like; the RLC mainly completes segmented cascade and sequential submission of data and (Automatic Repeat reQuest, ARQ) data transmission guarantee; the MAC mainly completes scheduling, cascade processing of different logic channels and HARQ operation; the physical layer completes physical layer processing and air interface sending of the transport block.
Ultra-dense networking is a trend of development of a future mobile communication system, and under the condition of ultra-dense networking, in order to realize unified control plane management of a large number of distributed processing nodes, part of protocol functions need to be processed in a centralized manner. This forms a two-layer structure of centralized processing nodes and distributed processing nodes, also referred to as Transmission Reception Points (TRPs). The centralized processing node may be further divided into a control plane of the centralized processing node and a user plane of the centralized processing node according to different functions. Based on the above description, a network architecture diagram of a future mobile communication system is shown in fig. 2, for user plane processing, existing user plane functions may be divided between a centralized processing node and a distributed processing node, and currently, five (Option 1-Option 5) solutions for separating user plane protocol layers are well known and shown in fig. 3. The interface between the centralized processing node and the distributed processing node is called front haul.
In summary, in the inter-cell handover in the prior art, once the UE performs the inter-cell handover, the MAC needs to be reset, and the RLC and PDCP are re-established, so that the handover delay is long and the transmission efficiency is low.
Disclosure of Invention
The embodiment of the application provides a switching method and a switching control method and device, which are used for shortening switching time delay and improving transmission efficiency.
On a network side, a handover control method provided in an embodiment of the present application includes:
the centralized processing node determines that User Equipment (UE) needs to switch the distributed processing nodes;
the centralized processing node sends a switching indication signaling to the UE, the switching indication signaling is used for indicating the UE to switch the distributed processing nodes, the switching indication signaling carries switching type indication information, and the switching type indication information is used for indicating the centralized processing node to keep a network node to which a network side Radio Link Control (RLC) layer corresponding to the UE belongs unchanged in the process that the UE switches the distributed processing nodes.
According to the method, a centralized processing node determines that User Equipment (UE) needs to switch distributed processing nodes, the centralized processing node sends a switching indication signaling to the UE for indicating the UE to switch the distributed processing nodes, the switching indication signaling carries switching type indication information, and the switching type indication information is used for indicating the centralized processing node to keep a network node to which a network side Radio Link Control (RLC) layer corresponding to the UE belongs unchanged in the process that the UE switches the distributed processing nodes, so that switching time delay is shortened, transmission efficiency is improved, and user switching experience is improved.
Preferably, the centralized processing node sends a handover indication signaling to the UE through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the method further comprises:
the centralized processing node determines the downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
and the centralized processing node sends the uplink RLC receiving state of the UE to the UE.
Preferably, the determining, by the centralized processing node, the downlink RLC reception status of the UE specifically includes:
the centralized processing node receives a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determines the downlink RLC receiving status of the UE from the downlink RLC status report; or,
the centralized processing node receives a downlink RLC status report of the UE carried by the UE when a source transmission node reports related measurement for switching, and determines the downlink RLC receiving status of the UE from the downlink RLC status report; or,
and the Radio Link Control (RLC) layer of the centralized processing node determines a downlink RLC status report of the UE based on the downlink RLC status received before the source transmission node.
Preferably, the sending, by the centralized processing node, the uplink RLC reception status of the UE to the UE specifically includes:
the centralized processing node carries the uplink RLC receiving state of the UE when issuing a switching indication signaling; or,
and after receiving a switching completion indication signaling sent by the UE from a target distributed processing node of the UE, the centralized processing node issues an uplink RLC receiving state of the UE to the UE through the target distributed processing node.
Correspondingly, on the terminal side, the handover method provided by the embodiment of the present application includes:
user Equipment (UE) receives a switching indication signaling sent by a centralized processing node;
and the UE performs switching of the distributed processing nodes according to the switching indication signaling, wherein the switching indication signaling carries switching type indication information, and the switching type indication information is used for indicating the centralized processing node to keep a network node to which a network side Radio Link Control (RLC) layer corresponding to the UE belongs unchanged in the process of performing distributed processing node switching by the UE.
Preferably, the UE receives the handover indication signaling through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the method further comprises:
the UE sends a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and the UE receives the uplink RLC receiving state of the UE sent by the centralized processing node.
Preferably, the sending, by the UE, the downlink RLC reception status to the centralized processing node specifically includes:
the UE sends the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by the UE; or,
and the UE carries a downlink RLC state report of the UE at the source distributed processing node to the centralized processing node when carrying out switching related measurement report at the source transmission node.
Preferably, the receiving, by the UE, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when the UE receives the switching indication signaling, the UE acquires an uplink RLC receiving state from the switching indication signaling; or,
and the UE sends a switching completion signaling to the centralized processing node through a target distributed processing node of the UE, and receives an uplink RLC receiving state of the UE sent by the centralized processing node through the target distributed processing node.
Preferably, the method further comprises:
after the UE is accessed to the target distributed processing node, the UE goes upward and continuously sends RLC PDUs which are not successfully transmitted before switching and RLC SDUs which are transmitted before switching to a network side according to the transmission state of an RLC layer before switching; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
An embodiment of the present application provides a handover control apparatus, including:
a first unit, configured to determine that a user equipment UE needs to perform handover of a distributed processing node;
a second unit, configured to send a handover indication signaling to the UE, configured to indicate the UE to perform handover of the distributed processing node, where the handover indication signaling carries handover type indication information, and the handover type indication information is used to indicate the centralized processing node to keep a network node to which a network side radio link control RLC layer corresponding to the UE belongs unchanged in a process of performing distributed processing node handover by the UE.
Preferably, the second unit sends a handover indication signaling to the UE through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the second unit is further configured to:
determining a downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
and sending the uplink RLC receiving state of the UE to the UE.
Preferably, the determining, by the second unit, the downlink RLC reception status of the UE specifically includes:
receiving a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
receiving a downlink RLC (radio link control) status report of the UE carried by the UE when a source transmission node reports handover related measurement, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
determining, by a radio link control, RLC, layer, a downlink RLC status report of the UE based on a downlink RLC status received prior to a source transmission node.
Preferably, the sending, by the second unit, the uplink RLC reception status of the UE to the UE specifically includes:
carrying the uplink RLC receiving state of the UE when issuing a switching indication signaling; or,
and after receiving a switching completion indication signaling sent by the UE from a target distributed processing node of the UE, issuing an uplink RLC receiving state of the UE to the UE through the target distributed processing node.
An embodiment of the present application provides a switching apparatus, including:
a receiving unit, configured to receive a handover indication signaling sent by a centralized processing node, where the handover indication signaling carries handover type indication information;
and the switching unit is used for determining that the distributed processing node needs to be switched according to the switching type indication information carried in the switching indication signaling, and keeping the network side node to which the network side RLC layer belongs unchanged in the switching process.
Preferably, the receiving unit receives the handover indication signaling through a source distributed processing node of a user equipment UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the switching unit is further configured to:
sending a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and receiving the uplink RLC receiving state of the UE sent by the centralized processing node.
Preferably, the sending, by the handover unit, the downlink RLC reception status to the centralized processing node specifically includes:
sending the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by User Equipment (UE); or,
and carrying the downlink RLC state report of the UE to the centralized processing node when the source transmission node performs the switching related measurement report.
Preferably, the receiving, by the handover unit, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when receiving the switching indication signaling, acquiring an uplink RLC receiving state from the switching indication signaling; or,
and sending a switching completion signaling to the centralized processing node through a target distributed processing node of User Equipment (UE), and receiving an uplink Radio Link Control (RLC) receiving state of the UE sent by the centralized processing node through the target distributed processing node.
Preferably, the switching unit is further configured to:
after accessing the target distributed processing node, in the uplink, according to the transmission state of the RLC layer before switching, continuously sending the RLC PDU which is not successfully transmitted before switching and the RLC SDU which is transmitted; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a user plane protocol stack of an LTE system in the prior art;
fig. 2 is a schematic diagram of a possible network architecture of a future mobile communication system proposed in the prior art;
FIG. 3 is a schematic diagram of a user plane protocol layer separation scheme between a centralized processing node and a distributed processing node in the prior art;
fig. 4 is a schematic flowchart of a handover control method at a network side according to an embodiment of the present application;
fig. 5 is a flowchart illustrating a handover method at a terminal side according to an embodiment of the present application;
fig. 6 is a schematic diagram of a transmission node switching process according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a handover control apparatus on a network side according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a switching device at a terminal side according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of another handover control apparatus on a network side according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of another switching device at a terminal side according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a switching method and a switching control method and device, which are used for shortening switching time delay and improving transmission efficiency.
In the future development of the mobile communication system, in order to better meet the user requirements and greatly improve the network capacity and throughput, more transmission nodes are inevitably introduced, i.e. the mobile communication system is an ultra-dense network in the future. In a super-dense network, in order to implement unified control plane management for a large number of distributed processing nodes, it is necessary to centralize part of protocol functions to a centralized processing node for centralized processing. In such a scenario, the functions of the centralized processing node and the functions of each distributed processing node need to be well divided, so as to improve the processing efficiency and ensure that the UE has good handover experience when moving between the distributed processing nodes. The technical scheme provided by the embodiment of the application is applied to the switching process processing of the UE when the UE moves among the distributed processing nodes, and can shorten the switching time delay, thereby improving the transmission efficiency and improving the user switching experience.
Referring to fig. 4, on a network side, a handover control method provided in an embodiment of the present application includes:
s101, a centralized processing node determines that User Equipment (UE) needs to switch distributed processing nodes;
s102, the centralized processing node sends a switching indication signaling to the UE, the switching indication signaling is used for indicating the UE to switch the distributed processing nodes, the switching indication signaling carries switching type indication information, and the switching type indication information is used for indicating the centralized processing node to keep a network node to which a network side Radio Link Control (RLC) layer corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes by the UE.
When the centralized processing node judges that the UE needs to perform the distributed processing node switching, preferably, a switching indication signaling may be sent to the UE through the source distributed processing node, where the switching indication signaling carries the switching type indication information. After receiving the switching indication signaling, the UE judges that the network node to which the RLC layer of the network side belongs is not changed during switching according to the switching type indication information carried in the switching indication signaling, only resets the MAC, maintains the related configuration and state of the RLC and the PDCP unchanged, and then accesses the target distributed processing node. After accessing a target distributed processing node, continuously sending an RLC Packet Data Unit (PDU) which is not successfully transmitted before switching and an RLC Service Data Unit (Service Data Unit, SDU) which is transmitted before switching to a network side according to the transmission state of an RLC layer before switching in an uplink manner; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
Preferably, the handover indication signaling may be Radio Resource Control (RRC) signaling, Media Access Control (MAC) signaling, or physical layer signaling.
The switching type indication information may be 1bit, and is used to indicate that the position of the RLC layer on the network side is not changed in the switching process. Or N bit indication information, which is used for indicating the user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after switching.
To avoid duplicate transmissions:
for the downlink RLC transmission state, the centralized processing node needs to obtain a downlink RLC reception state from the UE, where the downlink RLC reception state is, for example: RLC SNs that have been successfully received and RLC SNs that have not been successfully received.
For the uplink RLC transmission status, the UE needs to acquire the uplink RLC reception status from the centralized processing node.
The method for the centralized processing node to acquire the downlink RLC receiving status from the UE includes, but is not limited to, the following ways:
the first mode is that after receiving a switching indication signaling carrying switching type indication information, the UE reports a downlink RLC status report to a centralized processing node through a target distributed processing node. For example, it may be reported together with the handover complete signaling.
And in the second mode, the UE carries the downlink RLC status report of the current source distributed processing node when the source transmission node carries out the switching related measurement report.
And thirdly, the RLC layer of the centralized processing node determines a downlink RLC status report of the UE at the source distributed processing node based on the downlink RLC status received before the source transmission node.
The method for the UE to acquire the uplink RLC reception status from the centralized processing node includes, but is not limited to, the following ways:
in the first mode, the centralized processing node carries an uplink RLC receiving status report when issuing a switching indication signaling.
The second method comprises the following steps: and when the centralized processing node receives a switching completion signaling sent by the UE from the target distributed processing node, the centralized processing node sends an uplink RLC receiving status report to the UE through the target distributed processing node.
Accordingly, on the terminal side, a handover method provided in the embodiment of the present application, referring to fig. 5, includes:
s201, User Equipment (UE) receives a switching indication signaling sent by a centralized processing node, wherein the switching indication signaling carries switching type indication information;
s202, the UE determines that the distributed processing node needs to be switched according to the switching type indication information carried in the switching indication signaling, and the network side node to which the network side RLC layer belongs is kept unchanged in the switching process.
Preferably, the UE receives the handover indication signaling through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the method further comprises:
the UE sends a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and the UE receives the uplink RLC receiving state of the UE sent by the centralized processing node.
Preferably, the sending, by the UE, the downlink RLC reception status to the centralized processing node specifically includes:
the UE sends the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by the UE; or,
and the UE carries a downlink RLC state report of the UE at the source distributed processing node to the centralized processing node when carrying out switching related measurement report at the source transmission node.
Preferably, the receiving, by the UE, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when the UE receives the switching indication signaling, the UE acquires an uplink RLC receiving state from the switching indication signaling; or,
and the UE sends a switching completion signaling to the centralized processing node through a target distributed processing node of the UE, and receives an uplink RLC receiving state of the UE sent by the centralized processing node through the target distributed processing node.
Preferably, the method further comprises:
after the UE is accessed to the target distributed processing node, the UE goes upward and continuously sends RLC PDUs which are not successfully transmitted before switching and RLC SDUs which are transmitted before switching to a network side according to the transmission state of an RLC layer before switching; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
An illustration of several embodiments is given below.
Example 1: the switching indication signaling adopts RRC signaling.
The transfer node switching process is shown in fig. 6, and includes:
step 1: and (6) measuring and reporting.
And the UE carries out measurement report when meeting the measurement trigger event according to the measurement result, wherein the measurement report firstly reaches the source distributed processing node and then reaches the centralized processing node through the transfer of the source distributed processing node.
Step 2: and (6) switching and judging.
And the centralized processing node performs distributed processing node switching judgment according to the measurement result reported by the UE, and determines a target distributed processing node through the switching judgment.
And step 3: handover indication signaling.
The centralized processing node sends a switching indication signaling to the UE through the source distributed processing node, and the switching indication signaling uses RRC signaling, such as RRC reconfiguration signaling. Handover type indication information needs to be carried in RRC reconfiguration signaling.
The switching type indication information may be 1bit, and is used to indicate that the position of the RLC layer on the network side is not changed in the switching process. Or N bit indication information, which is used for indicating the user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after switching.
And 4, step 4: and switching the distributed processing nodes.
After receiving the switching indication signaling, the UE judges that the network node to which the RLC layer of the network side belongs is not changed during switching according to the switching type indication information carried in the switching indication signaling, only resets the MAC, maintains the states of the RLC and the PDCP unchanged, and then accesses a target distributed processing node.
And 5: and (5) uplink synchronization process.
This process is an optional step.
Step 6: and signaling a switching completion indication.
The UE sends a handover complete indication signaling, which may be an RRC signaling, such as an RRC reconfiguration complete, to the centralized processing node through the target distributed processing node.
And 7: data transmission
And the UE interacts uplink/downlink data between the centralized processing nodes through the target distributed processing nodes. In order to avoid repeated data transmission, for the downlink RLC transmission status, the centralized processing node needs to acquire the downlink RLC reception status from the UE. For the uplink RLC transmission status, the UE needs to acquire the uplink RLC reception status from the centralized processing node.
The method for the centralized processing node to acquire the downlink RLC receiving status from the UE includes, but is not limited to, the following ways:
the first mode is that after receiving a switching indication signaling carrying switching type indication information, the UE reports a downlink RLC status report to a centralized processing node through a target distributed processing node. For example, it may be reported together with the handover complete signaling.
And in the second mode, the UE carries the downlink RLC status report of the current source distributed processing node when the source transmission node carries out the switching related measurement report.
And thirdly, the RLC layer of the centralized processing node determines a downlink RLC status report of the UE at the source distributed processing node based on the downlink RLC status received before the source transmission node.
The method for the UE to acquire the uplink RLC reception status from the centralized processing node includes, but is not limited to, the following ways:
in the first mode, the centralized processing node carries an uplink RLC receiving status report when issuing a switching indication signaling.
And in the second mode, when the centralized processing node receives a switching completion signaling sent by the UE from the target distributed processing node, the uplink RLC receiving status report is sent to the UE through the target distributed processing node.
Example 2: the switching indication signaling adopts MAC signaling.
The procedure and steps of this example are largely the same as in example 1, except for step 3 and step 6. For step 3 and step 6, if the configuration of the source distributed processing node and the target distributed processing node is the same (such as PDCP/RLC/MAC/PHY configuration), MAC signaling may also be used as the distributed node switching indication signaling. The advantage with respect to embodiment 1 is that it is advantageous to shorten the handover delay.
For example, for step 3, a new MAC Control Element (CE) is introduced for carrying the handover type indication information. The MAC CE may occupy 1bit (byte) for indicating that the RLC layer location of the network side is unchanged during the handover process. Or N bit indication information, which is used for indicating the user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after switching.
For example, for step 6, the centralized processing node may also be informed of the completion of the UE handover by the target distributed processing node using the new MAC CE. The MAC CE needs to carry the identification information of the UE, such as C-RNTI or UE ID.
In this way, the RLC status report may also be indicated by the MAC CE.
Example 3: the handover indication signaling employs layer 1(L1) signaling.
The procedure and steps of this example are largely the same as in example 1, except for step 3 and step 6. For step 3 and step 6, if the configuration of the source distributed processing node and the target distributed processing node is the same (such as PDCP/RLC/MAC/PHY configuration), MAC signaling may also be used as the distributed node switching indication signaling. Layer 1(L1) signaling may be used as distributed node handover indication signaling, i.e., PDCCH signaling. The advantage with respect to embodiment 2 is that the handover delay can be further shortened.
For example, for step 3, a new PDCCH DCI format is introduced for carrying the handover type indication information. 1bit in a Physical Downlink Control Channel (PDCCH) Downlink Control Information (DCI) format (format) is used for indicating that the position of a network side RLC layer is unchanged in a handover process. Or N bit indication information, which is used for indicating the user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after switching.
For example, for step 6, uplink physical layer signaling may also be used to indicate that the distributed processing node is completed to switch.
In this manner, RLC status reports may also be indicated by L1 signaling.
It should be noted that: for embodiment 1/2/3, step 3 and step 6 are both described based on using the same signaling in the present description, but the signaling used in both steps may be combined arbitrarily in actual implementation, for example, step 3 uses RRC signaling and step 6 uses MAC signaling, which is not described herein again.
Referring to fig. 7, on the network side, a handover control apparatus provided in an embodiment of the present application includes:
a first unit 11, configured to determine that a user equipment UE needs to perform handover of a distributed processing node;
a second unit 12, configured to send a handover indication signaling to the UE, configured to indicate the UE to perform handover of a distributed processing node, where the handover indication signaling carries handover type indication information, and the handover type indication information is used to indicate that the centralized processing node keeps a network node to which a network side radio link control RLC layer corresponding to the UE belongs unchanged in a process of performing distributed processing node handover by the UE.
Preferably, the second unit sends a handover indication signaling to the UE through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the second unit is further configured to:
determining a downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
and sending the uplink RLC receiving state of the UE to the UE.
Preferably, the determining, by the second unit, the downlink RLC reception status of the UE specifically includes:
receiving a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
receiving a downlink RLC (radio link control) status report of the UE carried by the UE when a source transmission node reports handover related measurement, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
determining, by a radio link control, RLC, layer, a downlink RLC status report of the UE based on a downlink RLC status received prior to a source transmission node.
Preferably, the sending, by the second unit, the uplink RLC reception status of the UE to the UE specifically includes:
carrying the uplink RLC receiving state of the UE when issuing a switching indication signaling; or,
and after receiving a switching completion indication signaling sent by the UE from a target distributed processing node of the UE, issuing an uplink RLC receiving state of the UE to the UE through the target distributed processing node.
The switching control device may be a centralized control node.
On the terminal side, referring to fig. 8, a switching apparatus provided in an embodiment of the present application includes:
a receiving unit 21, configured to receive a handover indication signaling sent by a centralized processing node, where the handover indication signaling carries handover type indication information;
a switching unit 22, configured to determine, according to the switching type indication information carried in the switching indication signaling, that switching of the distributed processing node needs to be performed, and keep a network side node to which the network side RLC layer belongs unchanged in the switching process.
Preferably, the receiving unit receives the handover indication signaling through a source distributed processing node of a user equipment UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the switching unit is further configured to:
sending a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and receiving the uplink RLC receiving state of the UE sent by the centralized processing node.
Preferably, the sending, by the handover unit, the downlink RLC reception status to the centralized processing node specifically includes:
sending the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by User Equipment (UE); or,
and carrying the downlink RLC state report of the UE to the centralized processing node when the source transmission node performs the switching related measurement report.
Preferably, the receiving, by the handover unit, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when receiving the switching indication signaling, acquiring an uplink RLC receiving state from the switching indication signaling; or,
and sending a switching completion signaling to the centralized processing node through a target distributed processing node of User Equipment (UE), and receiving an uplink Radio Link Control (RLC) receiving state of the UE sent by the centralized processing node through the target distributed processing node.
Preferably, the switching unit is further configured to:
after accessing the target distributed processing node, in the uplink, according to the transmission state of the RLC layer before switching, continuously sending the RLC PDU which is not successfully transmitted before switching and the RLC SDU which is transmitted; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
The switching device may be a UE.
Referring to fig. 9, another switching control device provided in the embodiment of the present application includes:
the processor 500, which is used to read the program in the memory 520, executes the following processes:
determining that User Equipment (UE) needs to switch distributed processing nodes;
sending a switching indication signaling to the UE through the transceiver 510, where the switching indication signaling is used to indicate the UE to perform switching of the distributed processing nodes, and the switching indication signaling carries switching type indication information, where the switching type indication information is used to indicate the centralized processing node to keep a network node to which a network side radio link control RLC layer corresponding to the UE belongs unchanged in a process of performing distributed processing node switching by the UE.
Preferably, the processor 500 sends a handover indication signaling to the UE through a source distributed processing node of the UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the processor 500 is further configured to:
determining a downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
the uplink RLC reception status of the UE is transmitted to the UE through the transceiver 510.
Preferably, the determining, by the processor 500, the downlink RLC reception status of the UE specifically includes:
receiving a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
receiving a downlink RLC (radio link control) status report of the UE carried by the UE when a source transmission node reports handover related measurement, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
determining, by a radio link control, RLC, layer, a downlink RLC status report of the UE based on a downlink RLC status received prior to a source transmission node.
Preferably, the processor 500 sends the uplink RLC receiving status of the UE to the UE through the transceiver 510, which specifically includes:
when the transceiver 510 issues the switching indication signaling, the uplink RLC receiving state is carried to the UE; or,
when receiving a handover completion signaling sent by the UE through the transceiver 510 from a target distributed processing node of the UE, issuing an uplink RLC reception status to the UE through the target distributed processing node.
A transceiver 510 for receiving and transmitting data under the control of the processor 500.
Where in fig. 9, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 500 and memory represented by memory 520. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.
The processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).
Referring to fig. 10, another switching device provided in the embodiment of the present application includes:
the processor 600, which is used to read the program in the memory 620, executes the following processes:
receiving a switching indication signaling sent by a centralized processing node through a transceiver 610, wherein the switching indication signaling carries switching type indication information;
and determining that the distributed processing node needs to be switched according to the switching type indication information carried in the switching indication signaling, and keeping the network side node to which the RLC layer of the network side belongs unchanged in the switching process.
Preferably, the processor 600 receives the handover indication signaling through a source distributed processing node of a user equipment UE.
Preferably, the handover indication signaling is radio resource control RRC signaling, medium access control MAC signaling, or physical layer signaling.
Preferably, the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
Preferably, the processor 600 is further configured to:
sending a downlink RLC receive status to the centralized processing node via transceiver 610; and/or the presence of a gas in the gas,
and receiving the uplink RLC receiving state of the UE sent by the centralized processing node through a transceiver 610.
Preferably, the sending, by the processor 600, the downlink RLC reception status to the centralized processing node through the transceiver 610 specifically includes:
sending the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by User Equipment (UE); or,
and carrying the downlink RLC state report of the UE to the centralized processing node when the source transmission node performs the switching related measurement report.
Preferably, the receiving, by the processor 600 through the transceiver 610, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when receiving the switching indication signaling, acquiring an uplink RLC receiving state from the switching indication signaling; or,
and sending a switching completion signaling to the centralized processing node through a target distributed processing node of User Equipment (UE), and receiving an uplink Radio Link Control (RLC) receiving state of the UE sent by the centralized processing node through the target distributed processing node.
Preferably, the processor 600 is further configured to:
after accessing the target distributed processing node, in the uplink, according to the transmission state of the RLC layer before switching, the RLC PDU which is not successfully transmitted before switching and the RLC SDU which is transmitted are continuously transmitted to the network side through the transceiver 610; in the downlink, downlink RLC PDUs that were not successfully received before the handover are continuously received from the network side through the transceiver 610.
A transceiver 610 for receiving and transmitting data under the control of the processor 600.
Where in fig. 10, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 610 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 630 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.
The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.
To sum up, in the technical solution provided in this embodiment, when the centralized processing node determines that the UE needs to perform the distributed processing node switching, the source distributed processing node sends a switching indication signaling to the UE, where the switching indication signaling carries the switching type indication information. After receiving the switching indication signaling, the UE judges that the network node to which the RLC layer of the network side belongs is not changed during switching according to the switching type indication information carried in the switching indication signaling, only resets the MAC, maintains the related configuration and state of the RLC and the PDCP unchanged, and then accesses the target distributed processing node. After accessing the target distributed processing node, in the uplink, according to the transmission state of the RLC layer before switching, continuously sending the RLC PDU which is not successfully transmitted before switching and the RLC SDU which is transmitted; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side. The technical scheme provided by the embodiment of the application is applied to the switching process processing when the UE moves among the distributed nodes. The switching time delay can be shortened, the data volume of repeated transmission is reduced, and the user switching experience is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (30)

1. A handover control method, comprising:
the centralized processing node determines that User Equipment (UE) needs to switch the distributed processing nodes;
the centralized processing node sends a switching indication signaling to the UE, the switching indication signaling is used for indicating the UE to switch the distributed processing nodes, the switching indication signaling carries switching type indication information, and the switching type indication information is used for indicating the centralized processing node to keep a network node to which a network side Radio Link Control (RLC) layer corresponding to the UE belongs unchanged in the process that the UE switches the distributed processing nodes.
2. The method of claim 1, wherein the centralized processing node sends handover indication signaling to the UE through a source distributed processing node of the UE.
3. The method of claim 1, wherein the handover indication signaling is Radio Resource Control (RRC) signaling, Media Access Control (MAC) signaling, or physical layer signaling.
4. The method according to claim 1, wherein the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
5. The method of claim 1, further comprising:
the centralized processing node determines the downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
and the centralized processing node sends the uplink RLC receiving state of the UE to the UE.
6. The method according to claim 5, wherein the determining, by the centralized processing node, the downlink RLC reception status of the UE specifically includes:
the centralized processing node receives a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determines the downlink RLC receiving status of the UE from the downlink RLC status report; or,
the centralized processing node receives a downlink RLC status report of the UE carried by the UE when a source transmission node reports related measurement for switching, and determines the downlink RLC receiving status of the UE from the downlink RLC status report; or,
and the Radio Link Control (RLC) layer of the centralized processing node determines a downlink RLC status report of the UE based on the downlink RLC status received before the source transmission node.
7. The method according to claim 5, wherein the centralized processing node sends the uplink RLC reception status of the UE to the UE, specifically comprising:
the centralized processing node carries the uplink RLC receiving state of the UE when issuing a switching indication signaling; or,
and after receiving a switching completion indication signaling sent by the UE from a target distributed processing node of the UE, the centralized processing node issues an uplink RLC receiving state of the UE to the UE through the target distributed processing node.
8. A method of handover, the method comprising:
user Equipment (UE) receives a switching indication signaling sent by a centralized processing node, wherein the switching indication signaling carries switching type indication information;
and the UE determines that the distributed processing node needs to be switched according to the switching type indication information carried in the switching indication signaling, and keeps the network side node to which the RLC layer of the network side belongs unchanged in the switching process.
9. The method of claim 8, wherein the UE receives the handover indication signaling through a source distributed processing node of the UE.
10. The method of claim 8, wherein the handover indication signaling is Radio Resource Control (RRC) signaling, Media Access Control (MAC) signaling, or physical layer signaling.
11. The method according to claim 8, wherein the handover type indication information is specifically:
the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or,
n bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after switching, wherein N is an integer greater than 1.
12. The method of claim 8, further comprising:
the UE sends a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and the UE receives the uplink RLC receiving state of the UE sent by the centralized processing node.
13. The method according to claim 12, wherein the UE sends a downlink RLC reception status to the centralized processing node, specifically comprising:
the UE sends the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by the UE; or,
and the UE carries the downlink RLC status report of the UE to the centralized processing node when the source transmission node performs the switching related measurement report.
14. The method according to claim 12, wherein the receiving, by the UE, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when the UE receives the switching indication signaling, the UE acquires an uplink RLC receiving state from the switching indication signaling; or,
and after the UE sends a switching completion signaling to the centralized processing node through the target distributed processing node of the UE, receiving the uplink RLC receiving state of the UE sent by the centralized processing node through the target distributed processing node.
15. The method of any one of claims 8 to 14, further comprising:
after the UE is accessed to the target distributed processing node, the UE goes upward and continuously sends RLC PDUs which are not successfully transmitted before switching and RLC SDUs which are transmitted before switching to a network side according to the transmission state of an RLC layer before switching; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
16. A switching control device, comprising:
a first unit, configured to determine that a user equipment UE needs to perform handover of a distributed processing node;
a second unit, configured to send a handover indication signaling to the UE, configured to indicate the UE to perform handover of the distributed processing node, where the handover indication signaling carries handover type indication information, and the handover type indication information is used to indicate a centralized processing node to keep a network node to which a network side radio link control RLC layer corresponding to the UE belongs unchanged in a process of performing distributed processing node handover by the UE.
17. The apparatus of claim 16, wherein the second unit sends handover indication signaling to the UE through a source distributed processing node of the UE.
18. The apparatus of claim 16, wherein the handover indication signaling is Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, or physical layer signaling.
19. The apparatus according to claim 16, wherein the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
20. The apparatus of claim 16, wherein the second unit is further configured to:
determining a downlink RLC receiving state of the UE; and/or the presence of a gas in the gas,
and sending the uplink RLC receiving state of the UE to the UE.
21. The apparatus according to claim 20, wherein the second unit determines a downlink RLC reception status of the UE, specifically comprising:
receiving a downlink RLC status report reported by the UE through a target distributed processing node switched by the UE, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
receiving a downlink RLC (radio link control) status report of the UE carried by the UE when a source transmission node reports handover related measurement, and determining the downlink RLC receiving status of the UE from the downlink RLC status report; or,
determining, by a radio link control, RLC, layer, a downlink RLC status report of the UE based on a downlink RLC status received prior to a source transmission node.
22. The apparatus of claim 20, wherein the second unit sends the uplink RLC reception status of the UE to the UE, specifically comprising:
carrying the uplink RLC receiving state of the UE when issuing a switching indication signaling; or,
and after receiving a switching completion indication signaling sent by the UE from a target distributed processing node of the UE, issuing an uplink RLC receiving state of the UE to the UE through the target distributed processing node.
23. A UE-side handover apparatus, comprising:
a receiving unit, configured to receive a handover indication signaling sent by a centralized processing node, where the handover indication signaling carries handover type indication information;
and the switching unit is used for determining that the distributed processing node needs to be switched according to the switching type indication information carried in the switching indication signaling, and keeping the network side node to which the network side RLC layer belongs unchanged in the switching process.
24. The apparatus of claim 23, wherein the receiving unit receives the handover indication signaling through a source distributed processing node of a User Equipment (UE).
25. The apparatus of claim 23, wherein the handover indication signaling is Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, or physical layer signaling.
26. The apparatus according to claim 23, wherein the handover type indication information is specifically: the 1bit is used for indicating the UE to keep the network node to which the Radio Link Control (RLC) layer of the network side corresponding to the UE belongs unchanged in the process of switching the distributed processing nodes; or, N bits are used for indicating information of a user plane protocol stack separation scheme used between the centralized processing node and the distributed processing node before and after the switching, where N is an integer greater than 1.
27. The apparatus of claim 23, wherein the switching unit is further configured to:
sending a downlink RLC receiving state to the centralized processing node; and/or the presence of a gas in the gas,
and receiving the uplink RLC receiving state of the UE sent by the centralized processing node.
28. The apparatus of claim 27, wherein the handover unit sends a downlink RLC reception status to the centralized processing node, specifically comprising:
sending the downlink RLC receiving state to the centralized processing node through a downlink RLC state report reported by a target distributed processing node switched by User Equipment (UE); or,
and carrying a downlink RLC status report of the user equipment UE to the centralized processing node when the source transmission node performs switching related measurement report.
29. The apparatus according to claim 27, wherein the receiving, by the handover unit, the uplink RLC reception status of the UE sent by the centralized processing node specifically includes:
when receiving the switching indication signaling, acquiring an uplink RLC receiving state from the switching indication signaling; or,
and after the target distributed processing node of the user equipment UE sends the switching completion signaling to the centralized processing node, receiving the uplink RLC receiving state of the UE sent by the centralized processing node through the target distributed processing node.
30. The apparatus according to any one of claims 23 to 29, wherein the switching unit is further configured to:
after accessing the target distributed processing node, in the uplink, according to the transmission state of the RLC layer before switching, continuously sending the RLC PDU which is not successfully transmitted before switching and the RLC SDU which is transmitted; and in the downlink, the downlink RLC PDUs which are not successfully received before the handover are continuously received from the network side.
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