CN113766584B - Method and device for processing change of auxiliary node cell - Google Patents

Method and device for processing change of auxiliary node cell Download PDF

Info

Publication number
CN113766584B
CN113766584B CN202010507452.4A CN202010507452A CN113766584B CN 113766584 B CN113766584 B CN 113766584B CN 202010507452 A CN202010507452 A CN 202010507452A CN 113766584 B CN113766584 B CN 113766584B
Authority
CN
China
Prior art keywords
address
pdcp
teid
pscell
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010507452.4A
Other languages
Chinese (zh)
Other versions
CN113766584A (en
Inventor
赵博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datang Mobile Communications Equipment Co Ltd
Original Assignee
Datang Mobile Communications Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Priority to CN202010507452.4A priority Critical patent/CN113766584B/en
Publication of CN113766584A publication Critical patent/CN113766584A/en
Application granted granted Critical
Publication of CN113766584B publication Critical patent/CN113766584B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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

Landscapes

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

Abstract

The embodiment of the application provides a method and a device for processing change of a secondary node cell. The method comprises the following steps: receiving indication information indicating that the PSCell of the auxiliary node cell is changed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet; determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP entity is the IP address of the PDCP entity of the target cell of the PSCell change performed by the first terminal. The embodiment of the invention solves the problems that in the prior art, a great amount of gNB tunnel resources need to be consumed in the PSCell changing process, and the signaling flow between an eNB and a core network is increased.

Description

Method and device for processing change of auxiliary node cell
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for processing a change of a secondary node cell.
Background
In a New air interface technology (5th Generation New Radio, 5G NR) system of The fifth Generation mobile communication technology, in order to achieve a higher transmission rate and a lower transmission delay, a DUal Connectivity (DC) technology is introduced by The 3rd Generation Partnership Project (3 GPP). The DC technology is that a single User Equipment (UE) can establish communication links with two base stations respectively at the same time, and perform uplink and downlink communication through a dual communication link, thereby achieving higher-rate data transmission and lower time delay, and improving the performance of a wireless communication system. The dual communication link can better utilize radio resources compared to the single communication link.
Currently, 4G networks will have a long period of high-speed development, and even their importance will continue to precede 5G for a period of time from the point of view of carrying network traffic. Therefore, in the initial deployment of the 5G network, a combined architecture form of LTE and 5G Dual Connectivity (E-UTRA New Radio-Dual Connectivity, EN-DC) is adopted, where 5G is always associated with 4G link, and 4G and 5G are required to work simultaneously in some scenarios.
In an EN-DC scenario, an anchor Cell serving as User Equipment (UE) is a Master Cell Group (MCG); in general, a 4G base station (eNodeB) to which the UE is connected is a Master Node (MN), and a cell under the MN is an MCG; whereas a 5G base station (gdnodeb or gNB) is a Secondary Node (SN), the Cell of SN is usually a Secondary Cell Group (SCG).
The eNodeB is connected to the Packet Core network (EPC) through an S1 interface; the gNB may connect to the EPC through the S1 user plane interface (S1-U).
Under the MCG, there may be many cells (cells), wherein a Cell for initiating initial access is a Primary Cell (PCell), and other cells are Secondary cells (scells). The PCell under MCG and the SCell under MCG are joined together by Carrier Aggregation (CA). Similarly, there is also a Primary Cell under the SCG, i.e. a Secondary Cell Group (PSCell), where the SpCell is a Primary Cell Of a Master Or Secondary node (Primary Cell Of a Master Or Secondary Cell Group), and here is a Primary Cell Of the Secondary node, i.e. a Cell that starts to access under the SCG.
In a Non-Stand Alone (NSA) system, the probability of the UE changing the PSCell is high; in the process of PSCell change, a Secondary Node (SN) reallocates a core network address and a downlink Tunnel Endpoint Identifier (TEID) of an S1 interface of a New Radio (NR) system; in general, when the downlink traffic volume is larger than the uplink traffic volume, in the PSCell change process, the SN reallocates the core network and the downlink TEID of the S1 interface of the NR each time, which will consume a lot of gbb tunnel resources and increase the signaling flow between the eNB and the core network, resulting in signaling redundancy, traffic delay, and affecting user perception.
Disclosure of Invention
The embodiment of the application provides a method and a device for processing change of a secondary node cell, which are used for solving the problems that in the prior art, a great amount of gNB tunnel resources are consumed in a PSCell change process, and the signaling flow between an eNB and a core network is increased.
In one aspect, an embodiment of the present application provides a method for processing a change of a secondary node cell, where the method includes:
receiving indication information indicating that the PSCell of the auxiliary node cell is changed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP entity is the IP address of the PDCP entity of the target cell of the PSCell change performed by the first terminal.
Optionally, before the step of receiving indication information indicating that the change of the secondary node cell PSCell is completed, the method further includes:
receiving PSCell change information, and acquiring a second S1U-TEID of the second terminal and an IP address of a second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relation.
Optionally, the method comprises:
and receiving a PSCell change request message sent by the master node or receiving a measurement message indicating the PSCell change, and determining to trigger the PSCell change.
Optionally, after the step of receiving indication information indicating that the change of the secondary node cell PSCell is completed, the method includes:
after the first S1U-TEID in the auxiliary node modification message is cleared, the auxiliary node modification message is sent to the main node;
the auxiliary node modification message is a request response message of the PSCell change request message or an auxiliary node modification requirement message.
Optionally, after the step of determining the internet protocol IP address of the first packet data convergence protocol PDCP corresponding to the first S1U-TEID, the method further comprises:
and forwarding the downlink data packet to an IP address of the first PDCP.
On the other hand, an embodiment of the present application further provides a device for processing a change of a secondary node cell, where the device includes:
an information receiving module, configured to receive indication information indicating that a PSCell change of a secondary node cell is completed, and obtain a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
the address determining module is used for determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP entity is the IP address of the PDCP entity of the target cell of the PSCell change performed by the first terminal.
Optionally, the apparatus further comprises:
the address acquisition module is used for receiving the PSCell change information and acquiring a second S1U-TEID of the second terminal and an IP address of the second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and the recording module is used for recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relationship.
Optionally, the apparatus comprises:
a trigger module for receiving PSCell change request message sent by the master node or receiving measurement message indicating PSCell change, and determining to trigger PSCell change
Optionally, the apparatus comprises:
the message sending module is used for sending the auxiliary node modification message to the main node after clearing the first S1U-TEID in the auxiliary node modification message;
the secondary node modification message is a request response message of the PSCell change request message or a secondary node modification requirement message.
Optionally, the apparatus further comprises:
and the data forwarding module is used for forwarding the downlink data packet to the IP address of the first PDCP.
In another aspect, an embodiment of the present application further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps in the secondary node cell change processing method when executing the computer program.
In still another aspect, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps in the secondary node cell change processing method described above.
In the embodiment of the application, receiving indication information indicating that the PSCell change is completed, and acquiring a first S1U-TEID of a first terminal carried in a downlink packet; determining the IP address of the first PDCP corresponding to the first S1U-TEID according to the preset corresponding relation; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal; determining the IP address of the first PDCP through the first S1U-TEID carried in the downlink data packet, and establishing a downlink data tunnel; in switching in the SN station, the TEID does not need to be reallocated to the S1 interface downlink service of each bearer every time the PSCell is changed, but a downlink tunnel is established by utilizing the pre-configured IP address of the first PDCP, so that the number of times of distributing the TEID is reduced, and the tunnel resource of the base station is saved; in addition, the downlink S1U-TEID of the master node side is pre-stored, service data channel update signaling interaction with the core network is not performed any more in the PSCell change process, the signaling process of the eNB and the core network is reduced, the switching speed is increased, and further user perception is improved. The embodiment of the invention solves the problems that in the prior art, a great amount of gNB tunnel resources are required to be consumed in the PSCell changing process, and the signaling flow between the eNB and the core network is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application 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 that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for processing a change of a secondary node cell according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the structure of S1U-TEID provided in an embodiment of the present application;
FIG. 3 is an interaction diagram of a first example provided by an embodiment of the present application;
FIG. 4 is an interaction diagram of a second example provided by an embodiment of the present application;
fig. 5 is a block diagram of a structure of a secondary node cell change processing apparatus according to an embodiment of the present application;
fig. 6 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also be determined from a and/or other information.
Fig. 1 shows a flowchart of a secondary node cell change processing method according to an embodiment of the present application.
As shown in fig. 1, an embodiment of the present application provides a method for processing a change of a Secondary Node cell, where the method may be applied to a Secondary Node (SN); in an EN-DC scenario, the secondary node is typically a 5G base station (hereinafter abbreviated to gNB), which is an access network device, and the base station is a device deployed in an access network to provide a wireless communication function for a UE. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with base station functionality may differ, for example in a 5G NR system, called nodeb or gNB. The name "base station" may change as communication technology evolves. For convenience of description, in the embodiments of the present application, the above-mentioned apparatuses providing a UE with a wireless communication function are collectively referred to as a base station.
The method comprises the following steps:
step 101, receiving indication information indicating that the change of the PSCell of the secondary node cell is completed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of the first terminal carried in a downlink data packet.
The UE periodically measures the quality of the wireless network and sends a Measurement result to a base station (a main base station or an auxiliary base station) in a Measurement Report (MR) message; after receiving the MR message, the base station determines whether the UE has a condition for performing PSCell change (or handover) in the secondary base station according to the measurement result carried in the MR message; if yes, initiating a PSCell change process and determining a changed target cell. That is, the PSCell change may be initiated by the secondary base station or the primary node; if the master node initiates the request, the master node sends a secondary node modification request to the secondary node; if the auxiliary node initiates itself, the measurement message of the PSCell change is received.
After receiving the indication information indicating that the PSCell change is completed, the slave node receives a core network downlink packet, and obtains a downlink Tunnel Endpoint Identifier (TEID) of a first S1 user plane interface (S1U) carried in the downlink packet.
Specifically, in a general packet radio service Tunneling Protocol (GTP) system, an IP address of one UE to which one Access Point Name (APN) is connected has one and only one GTP control plane tunnel (GTP-C) but may have one to multiple GTP user plane tunnels (GTP-U) on an interface using the GTPv1 Protocol. When each GTP Tunnel is established, no matter the GTP-C Tunnel or the GTP-U Tunnel, nodes at both ends of the Tunnel are respectively assigned with a Tunnel End Identifier (TEID). And after the GTP tunnel is established, when the sending node sends a GTP message to the receiving node, the header of the GTP message carries the TEID value distributed by the receiving node. The TEID identifies the tunnel endpoint in the GTP-U or GTP-C protocol of the peer. And distributing a local TEID value by the receiving end of the GTP tunnel for the initiating end of the GTP tunnel to use. The TEID (contained in the FTEID) values are exchanged between the two endpoints of the tunnel via GTP-C messages, and a GTP tunnel can be uniquely determined by the IP address, port number and TEID value.
Step 102, determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to a first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP is an IP address of a PDCP of a target cell of the PSCell change performed by the first terminal.
The preset corresponding relationship comprises the IP address of a Packet Data Convergence Protocol (PDCP) corresponding to each S1U-TEID; specifically, before the first terminal changes the PSCell (this PSCell change, or a certain previous PSCell change, for example, the first terminal changes the PSCell for the first time), the secondary node allocates S1U-TEID to the first terminal, and then binds S1U-TEID with the IP address of the PDCP of the target cell and records the binding in the corresponding relationship; thus, when the first terminal subsequently performs PSCell change, the auxiliary node directly determines the IP address of the PDCP of the target cell corresponding to the first S1U-TEID according to the correspondence, and then forwards the downlink packet to the IP address of the first PDCP, thereby implementing transmission of downlink data; without reassigning TEIDs.
In the embodiment of the application, receiving indication information indicating that the PSCell is changed, and acquiring a first S1U-TEID of a first terminal carried in a downlink data packet; determining the IP address of the first PDCP corresponding to the first S1U-TEID according to the preset corresponding relation; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal; determining the IP address of the first PDCP through the first S1U-TEID carried in the downlink data packet, and establishing a downlink data tunnel; in switching in the SN station, the TEID does not need to be reallocated to the S1 interface downlink service of each bearer every time PSCell is changed, but a downlink tunnel is established by utilizing the IP address of the first PDCP which is configured in advance, so that the TEID allocation frequency is reduced, and the tunnel resource of the base station is saved; in addition, the downlink S1U-TEID of the master node side is pre-stored, service data channel update signaling interaction with the core network is not performed any more in the PSCell change process, the signaling process of the eNB and the core network is reduced, the switching speed is increased, and user perception is improved. The embodiment of the invention solves the problems that in the prior art, a great amount of gNB tunnel resources need to be consumed in the PSCell changing process, and the signaling flow between an eNB and a core network is increased.
In an optional embodiment, before the step of receiving indication information indicating that the change of the secondary node cell PSCell is completed, the method further includes:
receiving PSCell change information, and acquiring a second S1U-TEID of the second terminal and an IP address of a second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relation.
Specifically, when determining U E that a condition for performing a PSCell change is present, the slave node initiates a PSCell change.
It is to be understood that the second terminal may be the first terminal, and may also be another terminal.
When the auxiliary node receives the change information, acquiring a second S1U-TEID of the second terminal and an IP address of a second PDCP; when the second terminal changes the PSCell, the identification numbers of the PDCP of the source cell and the PDCP of the target cell are different, and when a signaling switching process is carried out, the auxiliary node binds the S1U-TEID of the second terminal at the current moment and the IP address of the PDCP of the target cell and records the binding in the corresponding relation; meanwhile, the service data can be registered to a service data forwarding module of the auxiliary node; in addition, the corresponding relationship may also be recorded in the service data forwarding module, so that the service data forwarding module executes downlink service data forwarding.
A second S1U-TEID assigned by the secondary node by the second terminal prior to the PSCell change; for example, if the PSCell is initially added to the second terminal before the PSCell change, the current S1U-TEID is allocated to the second terminal by the secondary base station in the process.
After the switching signaling process is completed, when the service data forwarding module receives a downlink service data packet of the core network, the downlink S1U-TEID carried in the downlink data packet is obtained, the IP address of the target cell PDCP corresponding to the S1U-TEID is searched according to the corresponding relation, and then the data packet is forwarded to the target cell.
Alternatively, referring to FIG. 2, the structure of the Downlink S1U-TEID includes two parts; the segment a is an identification number of the service data receiving module PDCP, and the segment B is a TEID index (TEID index) assigned to each bearer.
The internal IP address of the service data receiving module PDCP is calculated by the identification number, the machine frame number, the slot number and the processor number.
In an alternative embodiment, the method comprises:
and receiving a PSCell change request message sent by the master node or receiving a measurement message indicating the PSCell change, and determining to trigger the PSCell change.
The PSCell change can be initiated by a secondary base station or a main node; if the master node initiates the PSCell change, the master node sends a secondary node modification request, namely a PSCell change request message, to the secondary node, and if the secondary node receives the PSCell change request message sent by the master node, the master node is confirmed to initiate the PSCell change; if the auxiliary node initiates itself, the measurement message of the PSCell change is received.
After the PSCell change is triggered, step 101 may be executed or the step of receiving PSCell change information and acquiring the second S1U-TEID of the second terminal and the IP address of the second PDCP may be executed.
In an optional embodiment, after the step of receiving indication information indicating that the change of the secondary node cell PSCell is completed, the method includes:
after the first S1U-TEID in the auxiliary node modification message is removed, the auxiliary node modification message is sent to the main node;
the auxiliary node modification message is a request response message of the PSCell change request message or an auxiliary node modification demand message; the auxiliary node sends the request response message to the main node in a PSCell change scene initiated by the main node; and the node modification demand message is sent to the main node by the auxiliary node in a PSCell change scene actively initiated by the auxiliary node.
It can be understood that, in the embodiment of the present application, clearing the first S1U-TEID in the auxiliary node modification message means that, if the auxiliary node modification message carries the first S1U-TEID, the first S1U-TEID is deleted; if the auxiliary node modification message does not carry the first S1U-TEID, the auxiliary node modification message does not need to be cleared; after the PSCell is changed, the auxiliary node reports the request response message to the main node, or when the auxiliary node modifies the demand message, the auxiliary node does not carry the first S1U-TEID; in this way, the downlink S1U-TEID on the master node side is pre-stored, and in the PSCell change procedure, the master node no longer performs service data channel update signaling interaction with the core network in order to transmit the downlink S1U-TEID, so as to reduce the signaling procedures between the eNB and the core network.
In an optional embodiment, after the step of determining the internet protocol IP address of the first packet data convergence protocol PDCP corresponding to the first S1U-TEID, the method further comprises:
and forwarding the downlink data packet to an IP address of the first PDCP.
And after the first terminal completes the switching signaling process in the auxiliary node station, the downlink accurate tunnel is successfully established. When the lower business data packet reaches the auxiliary node, the data forwarding module of the auxiliary node matches the bound PDCP according to the S1U-TEID in the data packet, and forwards the data packet to the IP address of the bound PDCP, so that seamless and smooth switching of data is achieved.
The method for processing a change of a secondary node cell provided in the embodiment of the present application will be described with reference to two examples.
Referring to fig. 3, fig. 3 shows a flow of the master node triggering the PSCell change, which mainly includes the following steps:
step 1, MN sends the auxiliary node modification request message to SN.
And step 2, if the SN judges that the PSCell change request is the PSCell change request according to the content of the auxiliary node modification request message, establishing a downlink tunnel, and replying an auxiliary node modification request response message to the MN, wherein the request response message does not carry downlink S1U-TEID, namely, the S1U-TEID in the modification request response message is removed.
In a process before PSCell is changed, such as a terminal adding process, SN allocates downlink S1U-TEID and binds the downlink S1U-TEID with an IP address of PDCP; and is carried to the MN, which carries the S1U-TEID to the core network, which is a Serving GateWay (SGW) and stores the S1U-TEID.
And step 3, the MN sends a wireless resource reconfiguration message to the UE.
Step 4, a random access process is carried out between the UE and the MN; in the case where the MN triggers the change of the secondary node, there may be a case where the MN also undergoes an intra-site handover (i.e., a handover to another cell of the MN); if the MN and the SN are switched in the station at the same time, the step 4 needs to be executed, and the UE also needs to establish a random access process with the MN; if the MN has not undergone an intra-site handover, step 4 may be omitted.
And step 5, the UE sends a radio resource reconfiguration response message to the MN.
And 6, the MN sends a reconfiguration completion message to the SN.
And 7, performing a random access process between the UE and the SN.
And step 8, the MN sends a sequence state transmission message to the SN.
And 9, data forwarding is carried out between the core network and the base station.
And step 10, the SN sends an auxiliary node flow reporting message to the MN.
The SN station inner switching process triggered by the MN (namely PSCell change) does not need to interact with the core network to update the signaling.
Referring to fig. 4, fig. 4 shows a flow of triggering PSCell change by a secondary node, which mainly includes the following steps:
step 1, when receiving the measurement message and judging that the PSCell change process is performed, the SN establishes a downlink tunnel and sends an auxiliary node modification requirement message to the MN without carrying downlink S1U-TEID.
In a flow before PSCell is changed, such as a terminal adding flow, SN allocates downlink S1U-TEID and binds the downlink S1U-TEID with an IP address of PDCP; and is carried to the MN, which carries the S1U-TEID to the core network, which is a Serving GateWay (SGW) and stores the S1U-TEID.
And 2, the MN sends an auxiliary node modification request message to the SN, and provides a forwarding address, a new SN key and the like.
And 3, the SN replies a secondary node modification request response message to the MN.
And step 4, the MN sends a radio resource reconfiguration message to the UE.
And step 5, the UE sends a radio resource reconfiguration response message to the MN.
And 6, the MN replies a modification confirmation message to the SN.
And 7, performing a random access process between the UE and the SN.
And step 8, the MN sends a sequence state transmission message to the SN.
And 9, data forwarding is carried out between the core network and the base station.
And step 10, the SN sends an auxiliary node flow reporting message to the MN.
And the SN triggered by the SN switches the switching process, and the MN does not need to interact with a core network to update the signaling.
In the embodiment of the application, the indication information indicating the completion of the PSCell change is received, and a first S1U-TEID of a first terminal carried in a downlink data packet is obtained; determining the IP address of the first PDCP corresponding to the first S1U-TEID according to the preset corresponding relation; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal; determining the IP address of the first PDCP through the first S1U-TEID carried in the downlink data packet, and establishing a downlink data tunnel; in switching in the SN station, the TEID does not need to be reallocated to the S1 interface downlink service of each bearer every time the PSCell is changed, but a downlink tunnel is established by utilizing the pre-configured IP address of the first PDCP, so that the number of times of distributing the TEID is reduced, and the tunnel resource of the base station is saved; in addition, the downlink S1U-TEID of the master node side is pre-stored, service data channel update signaling interaction with the core network is not performed any more in the PSCell change process, the signaling process of the eNB and the core network is reduced, the switching speed is increased, and user perception is improved. The embodiment of the invention solves the problems that in the prior art, a great amount of gNB tunnel resources are required to be consumed in the PSCell changing process, and the signaling flow between the eNB and the core network is increased.
With the foregoing description of the method for processing a change of a cell of an auxiliary node according to an embodiment of the present application, a device for processing a change of a cell of an auxiliary node according to an embodiment of the present application will be described with reference to the accompanying drawings.
Referring to fig. 5, an apparatus for processing a change of a secondary node cell is further provided in an embodiment of the present application, where the apparatus is applied to a base station, and includes:
an information receiving module 501, configured to receive indication information indicating that a PSCell change is completed in a secondary node cell, and obtain a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet.
The UE periodically measures the quality of the wireless network and sends a Measurement result to a base station (a main base station or an auxiliary base station) in a Measurement Report (MR) message; after receiving the MR message, the base station determines whether the UE has a condition for performing PSCell change (or handover) in the secondary base station according to the measurement result carried in the MR message; if yes, initiating a PSCell change process and determining a changed target cell. That is, the PSCell change may be initiated by the secondary base station or the primary node; if the master node initiates the request, the master node sends a secondary node modification request to the secondary node; if the auxiliary node initiates itself, the measurement message of the PSCell change is received.
After receiving the indication information indicating that the PSCell change is completed, the slave node receives a core network downlink packet, and obtains a downlink Tunnel Endpoint Identifier (TEID) of a first S1 user plane interface (S1U) carried in the downlink packet.
Specifically, in a general packet radio service Tunneling Protocol (GTP) system, an IP address of one UE to which one Access Point Name (APN) is connected has one and only one GTP control plane tunnel (GTP-C) but may have one to multiple GTP user plane tunnels (GTP-U) on an interface using the GTPv1 Protocol. When each GTP Tunnel is established, no matter the GTP-C Tunnel or the GTP-U Tunnel, nodes at both ends of the Tunnel are respectively assigned with a Tunnel End Identifier (TEID). When the sending node sends the GTP message to the receiving node after the GTP tunnel is established, the header of the GTP message carries the TEID value allocated by the receiving node. The TEID identifies the tunnel endpoint in the GTP-U or GTP-C protocol of the opposite end. And distributing a local TEID value by the receiving end of the GTP tunnel for the initiating end of the GTP tunnel to use. The TEID (contained in the FTEID) values are exchanged between the two endpoints of the tunnel via GTP-C messages, and a GTP tunnel can be uniquely determined by the IP address, port number and TEID value.
An address determining module 502, configured to determine, according to a preset corresponding relationship, an internet protocol IP address of a first packet data convergence protocol PDCP corresponding to the first S1U-TEID; the IP address of the first PDCP is an IP address of a PDCP of a target cell of the PSCell change performed by the first terminal.
The preset corresponding relation comprises an IP address of a Packet Data Convergence Protocol (PDCP) corresponding to each S1U-TEID; specifically, before the first terminal performs PSCell change (which may be the PSCell change of this time or a certain PSCell change before the first terminal performs the PSCell change for the first time), the secondary node allocates S1U-TEID to the first terminal, and then binds S1U-TEID with the IP address of the target cell PDCP and records the binding in the corresponding relationship; thus, when the first terminal subsequently performs PSCell change, the auxiliary node directly determines the IP address of the PDCP of the target cell corresponding to the first S1U-TEID according to the correspondence, and then forwards the downlink packet to the IP address of the first PDCP, thereby implementing transmission of downlink data; without reassigning TEIDs.
In an optional embodiment, the apparatus further comprises:
the address acquisition module is used for receiving the PSCell change information and acquiring a second S1U-TEID of the second terminal and an IP address of the second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and the recording module is used for recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relation.
In an alternative embodiment, the apparatus comprises:
and the triggering module is used for receiving the PSCell change request message sent by the main node or receiving the measurement message indicating the PSCell change and determining to trigger the PSCell change.
In an alternative embodiment, the apparatus comprises:
the message sending module is used for sending the auxiliary node modification message to the main node after clearing the first S1U-TEID in the auxiliary node modification message;
the auxiliary node modification message is a request response message of the PSCell change request message or an auxiliary node modification requirement message.
In an optional embodiment, the apparatus further comprises:
and the data forwarding module is used for forwarding the downlink data packet to the IP address of the first PDCP.
The secondary node cell change processing apparatus provided in this embodiment of the present application can implement each process implemented by the base station side in the method embodiments in fig. 1 to fig. 5, and is not described here again to avoid repetition.
In the embodiment of the present application, the information receiving module 501 receives indication information indicating that a PSCell change is completed, and obtains a first S1U-TEID of a first terminal carried in a downlink packet; the address determining module 502 determines the IP address of the first PDCP corresponding to the first S1U-TEID according to the preset correspondence; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal; determining the IP address of the first PDCP through the first S1U-TEID carried in the downlink data packet, and establishing a downlink data tunnel; in switching in the SN station, the TEID does not need to be reallocated to the S1 interface downlink service of each bearer every time the PSCell is changed, but a downlink tunnel is established by utilizing the pre-configured IP address of the first PDCP, so that the number of times of distributing the TEID is reduced, and the tunnel resource of the base station is saved; in addition, the downlink S1U-TEID of the master node side is pre-stored, service data channel update signaling interaction with the core network is not performed any more in the PSCell change process, the signaling process of the eNB and the core network is reduced, the switching speed is increased, and user perception is improved. The embodiment of the invention solves the problems that in the prior art, a great amount of gNB tunnel resources are required to be consumed in the PSCell changing process, and the signaling flow between the eNB and the core network is increased.
On the other hand, an embodiment of the present application further provides an electronic device, which includes a memory, a processor, a bus, and a computer program that is stored in the memory and is executable on the processor, where the processor implements the steps in the secondary node cell change processing method when executing the program.
For example, fig. 6 shows a schematic physical structure diagram of an electronic device.
As shown in fig. 6, the electronic device may include: a processor (processor)610, a communication Interface (Communications Interface)620, a memory (memory)630 and a communication bus 640, wherein the processor 610, the communication Interface 620 and the memory 630 communicate with each other via the communication bus 640. The processor 610 may call logic instructions in the memory 630 to perform the following method:
receiving indication information indicating that the PSCell of the auxiliary node cell is changed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP entity is the IP address of the PDCP entity of the target cell of the PSCell change performed by the first terminal.
In addition, the logic instructions in the memory 630 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to, when executed by a processor, perform the method for processing a cell change of a secondary node provided in the foregoing embodiments, for example, the method includes:
receiving indication information indicating that the PSCell of the auxiliary node cell is changed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP entity is the IP address of the PDCP entity of the target cell of the PSCell change performed by the first terminal.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on the understanding, the above technical solutions substantially or otherwise contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A method for processing cell change of a secondary node, the method comprising:
receiving indication information indicating that the PSCell of the auxiliary node cell is changed, and acquiring a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal;
after the step of receiving indication information indicating that the change of the secondary node cell PSCell is completed, the method includes:
after the first S1U-TEID in the auxiliary node modification message is removed, the auxiliary node modification message is sent to the main node; the secondary node modification message is a request response message of the PSCell change request message or a secondary node modification requirement message.
2. The method of claim 1, wherein prior to the step of receiving indication information indicating completion of the change of the PSCell of the secondary node, the method further comprises:
receiving PSCell change information, and acquiring a second S1U-TEID of the second terminal and an IP address of a second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relation.
3. The secondary node cell change handling method according to claim 1 or 2, characterized in that the method comprises:
and determining to trigger the PSCell change after receiving a PSCell change request message sent by the master node or receiving a measurement message indicating the PSCell change.
4. The secondary node cell change processing method of claim 1, wherein after the step of determining the internet protocol IP address of the first packet data convergence protocol PDCP corresponding to the first S1U-TEID, the method further comprises:
and forwarding the downlink data packet to an IP address of the first PDCP.
5. An apparatus for processing cell change of a secondary node, the apparatus comprising:
an information receiving module, configured to receive indication information indicating that a PSCell change of a secondary node cell is completed, and obtain a downlink tunnel endpoint identifier S1U-TEID of a first S1 user plane interface of a first terminal carried in a downlink data packet;
the address determining module is used for determining an Internet Protocol (IP) address of a first Packet Data Convergence Protocol (PDCP) corresponding to the first S1U-TEID according to a preset corresponding relation; the IP address of the first PDCP is the IP address of the PDCP of the target cell of the PSCell change of the first terminal;
the message sending module is used for sending the auxiliary node modification message to the main node after clearing the first S1U-TEID in the auxiliary node modification message; the auxiliary node modification message is a request response message of the PSCell change request message or an auxiliary node modification requirement message.
6. The secondary node cell change processing apparatus of claim 5, wherein the apparatus further comprises:
the address acquisition module is used for receiving the PSCell change information and acquiring a second S1U-TEID of the second terminal and an IP address of the second PDCP; the IP address of the second PDCP is the IP address of the PDCP of the target cell of the PSCell change of the second terminal;
and the recording module is used for recording the second S1U-TEID and the IP address of the second PDCP in the corresponding relationship.
7. The secondary node cell change processing apparatus according to claim 5 or 6, wherein the apparatus comprises:
and the triggering module is used for receiving the PSCell change request message sent by the main node or receiving the measurement message indicating the PSCell change and determining to trigger the PSCell change.
8. The secondary node cell change processing apparatus of claim 5, wherein the apparatus further comprises:
and the data forwarding module is used for forwarding the downlink data packet to the IP address of the first PDCP.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the secondary node cell change handling method of any of claims 1 to 4.
10. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of the secondary node cell change handling method of any of claims 1 to 4.
CN202010507452.4A 2020-06-05 2020-06-05 Method and device for processing change of auxiliary node cell Active CN113766584B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010507452.4A CN113766584B (en) 2020-06-05 2020-06-05 Method and device for processing change of auxiliary node cell

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010507452.4A CN113766584B (en) 2020-06-05 2020-06-05 Method and device for processing change of auxiliary node cell

Publications (2)

Publication Number Publication Date
CN113766584A CN113766584A (en) 2021-12-07
CN113766584B true CN113766584B (en) 2022-07-19

Family

ID=78785174

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010507452.4A Active CN113766584B (en) 2020-06-05 2020-06-05 Method and device for processing change of auxiliary node cell

Country Status (1)

Country Link
CN (1) CN113766584B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104054388A (en) * 2013-12-19 2014-09-17 华为技术有限公司 Carrier Aggregation Realizing Method, Device And System
CN105637905A (en) * 2013-10-14 2016-06-01 华为技术有限公司 A method, apparatus and system for implementing PDN connections
CN110225529A (en) * 2012-12-28 2019-09-10 日本电气株式会社 Master base station and its method
CN110519777A (en) * 2019-08-08 2019-11-29 武汉虹信通信技术有限责任公司 Main serving cell variation, host node and auxiliary node under a kind of dual link
CN110913439A (en) * 2018-09-17 2020-03-24 华为技术有限公司 Network element selection method and device
CN111083730A (en) * 2018-10-19 2020-04-28 中兴通讯股份有限公司 Data processing method and device and network equipment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1875763B1 (en) * 2005-04-29 2010-11-24 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Internetworking of cellular radio networks and wireless data networks
EP3657855B1 (en) * 2017-08-21 2022-10-05 Samsung Electronics Co., Ltd. Method and system for communication in wireless communication network

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110225529A (en) * 2012-12-28 2019-09-10 日本电气株式会社 Master base station and its method
CN105637905A (en) * 2013-10-14 2016-06-01 华为技术有限公司 A method, apparatus and system for implementing PDN connections
CN104054388A (en) * 2013-12-19 2014-09-17 华为技术有限公司 Carrier Aggregation Realizing Method, Device And System
CN110913439A (en) * 2018-09-17 2020-03-24 华为技术有限公司 Network element selection method and device
CN111083730A (en) * 2018-10-19 2020-04-28 中兴通讯股份有限公司 Data processing method and device and network equipment
CN110519777A (en) * 2019-08-08 2019-11-29 武汉虹信通信技术有限责任公司 Main serving cell variation, host node and auxiliary node under a kind of dual link

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Draft_36300-f50_v2".《3GPP tsg_ran\wg2_rl2》.2019, *
R2-2001899 "Introduction of even further mobility enhancement in E-UTRAN";ChinaTelecom;《3GPP tsg_ran\wg2_rl2》;20200312;全文 *

Also Published As

Publication number Publication date
CN113766584A (en) 2021-12-07

Similar Documents

Publication Publication Date Title
CN110166273B (en) Transmission method and network equipment
US11937319B2 (en) Integrity protection handling at the gNB-CU-UP
EP2706782A1 (en) Handover with mobile relays
US20180270809A1 (en) Operation method of communication node in millimeter wave based communication system
EP2925052A1 (en) Method for relocating gateway, mobile management entity and host base station
EP3716681A1 (en) Admission control delegation for moving iab
US11917521B2 (en) Method and apparatus for unique identification of individual users in the radio access network (RAN) intelligent controller
CN106034338B (en) The switching method and apparatus of mobile communication base station
CN114402661A (en) Switching method and device
EP3873132A1 (en) Data communication method and apparatus
CN110740023B (en) Method and device for sending control signaling, serving base station and storage medium
US20230254729A1 (en) Migration method and apparatus for iab-node
CN110447257B (en) Communication method, auxiliary network node and terminal
WO2020078220A1 (en) Data processing method and apparatus, and network device
EP4319314A1 (en) Signal sending and receiving method, signal sending and receiving apparatus, and communication system
RU2738618C1 (en) Path switching method and base station
EP4236451A1 (en) Group switching method, apparatus and system
CN106162732A (en) The method for transmission processing of user data, Apparatus and system
CN113766584B (en) Method and device for processing change of auxiliary node cell
EP4340444A1 (en) Method for sending and receiving signal, apparatus for sending and receiving signal, and communication system
CN113783669B (en) Method and device for modifying E-RAB (evolved radio access bearer)
US20240121683A1 (en) Upf based transmision of user data for selective activation to selective activation candidate nodes
WO2022205326A1 (en) Integrated access and backhaul donor migration methods and systems
CN109963315A (en) A kind of prothetic group station distribution method and device
CN116528398A (en) Tunnel information sending method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant