CN114466417A - Method for improving execution efficiency of UE in process of switching from NR base station to LTE base station, switching method and UE - Google Patents
Method for improving execution efficiency of UE in process of switching from NR base station to LTE base station, switching method and UE Download PDFInfo
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Abstract
The invention provides a method for improving execution efficiency of UE in the process of switching from an NR base station to an LTE base station, a switching method and the UE. In the Target to Source transmission Container cell in the hand REQUEST acknowledgement Message redesigned in the invention, the code stream coded by the hand COMMAND signaling is not carried any more, but the code stream coded by the DL-DCCH-Message is carried, so that the time delay in the UE switching process can be effectively reduced, the system overhead can be effectively reduced in the multi-UE simultaneous fallback scene, and the fallback failure caused by the overlarge system overhead can be avoided.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for improving execution efficiency of UE in the process of switching from an NR (non-return) base station to an LTE (Long term evolution) base station, a switching method and the UE.
Background
The 3GPP wireless system 38.413, 36.413, 36.331 defines a signaling flow for UE to fall back from NR base station to LTE base station, first, NR base station initiates HANDOVER signaling to 5GC (5G core network) to indicate that UE needs to HANDOVER from NR base station to LTE base station, 5GC initiates HANDOVER to corresponding EPC, EPC converts HANDOVER requested signaling into HANDOVER REQUEST to send to LTE base station, LTE base station processes the signal, returns resynchronization information needed by UE to EPC through HANDOVER REQUEST acknowledge message, EPC converts message into HANDOVER COMMAND signaling to return to source NR base station.
The Target to Source transmission Container cell carried in the HANDOVER COMMAND signaling is the relevant information prepared by the LTE base station for the UE to resynchronize to the LTE base station. After receiving the Target to Source transmission Container cell, the NR base station needs to perform ASN decoding according to the mode in the 36.331 protocol to obtain a HANDOVER COMMAND signaling, where the HANDOVER COMMAND signaling carries a complete DL-DCCH-Message (carrying an RRCConnectionReconfiguration cell), and the NR base station needs to re-encode the HANDOVER COMMAND signaling, and then brings the encoded code stream to the UE through a mobilityfrom nrcommand instruction to complete the fallback from the NR base station to the LTE base station. This approach faces the following problems:
the NR base station does not actually care about the content of the RRCConnectionReconfiguration cell carried by the LTE base station to the UE, and therefore, it is not necessary to decode and re-encode the RRCConnectionReconfiguration cell at all, which may cause an increase in system overhead, and a multi-user simultaneous fallback scenario has an obvious effect on system efficiency.
Disclosure of Invention
The invention aims to provide a method for improving execution efficiency of UE in the process of switching from an NR base station to an LTE base station, a switching method and the UE, so as to solve the problem of repeated coding and decoding of RRCConnectionReconfiguration in the process of switching from the NR base station to the LTE base station, thereby improving time efficiency of the UE in the process of switching from the NR base station to the LTE base station and reducing system overhead.
The invention provides a method for improving the execution efficiency of UE in the process of switching from an NR base station to an LTE base station, which comprises the following steps:
the execution efficiency of the UE in the process of switching from the NR base station to the LTE base station is improved by redesigning a Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE message.
Furthermore, the Target to Source transmission Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message does not carry the code stream coded by the HANDOVER COMMAND signaling any more, but carries the code stream coded by the DL-DCCH-Message.
Further, the method for redesigning the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE message comprises:
when preparing a Target to Source transmission Container cell, the LTE base station does not use the format of HANDOVER COMMAND signaling for coding, but directly performs ASN coding on a DL-DCCH-Message including an RRCConnectionReconfiguration cell, then puts the Message into the Target to Source transmission Container cell, and brings the Message to EPC through HANDOVER REQUEST acknowledgement Message.
Further, when the UE is handed over from the NR base station to the LTE base station, after receiving the HANDOVER COMMAND signaling, the NR base station does not perform ASN decoding on the Target to Source transfer Container cell, but directly passes the corresponding code stream to the UE.
The invention also provides a method for switching the UE from the NR base station to the LTE base station, which comprises the following steps:
s1, the NR base station initiates a HANDOVER REQUERED signaling to the 5GC, indicates that the UE needs to be switched from the NR base station to the LTE base station, the 5GC initiates a switch to a corresponding EPC, and the EPC converts the HANDOVER REQUERED signaling into a HANDOVER REQUEST and sends the HANDOVER REQUEST to the LTE base station;
s2, after the LTE base station finishes processing, the resynchronization information needed by the UE is returned to the EPC through a HANDOVER REQUEST ACKNOWLEDG message, and the EPC converts the HANDOVER REQUEST ACKNOWLEDG message into a HANDOVER COMMAND signaling and returns to the source NR base station; wherein, the HANDOVER REQUEST acknowledge message carries the redesigned Target to Source transfer Container cell; the code stream coded by the DL-DCCH-Message is carried in a Target to Source transfer Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message;
s3, after receiving the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE Message, the NR base station brings the code stream coded by the DL-DCCH-Message carried by the NR base station to the UE through a MobilityFromNRCommand instruction so as to complete the switching of the UE from the NR base station to the LTE base station.
The invention also provides the UE which adopts the switching method to switch from the NR base station to the LTE base station.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the Target to Source transmission Container cell in the hand REQUEST acknowledgement Message redesigned in the invention does not carry the code stream coded by the hand COMMAND signaling any more, but carries the code stream coded by the DL-DCCH-Message. Therefore, after receiving the HANDOVER COMMAND signaling, the NR base station does not perform ASN decoding on the Target to Source transfer Container cell, but directly transmits the corresponding code stream to the UE. Therefore, unnecessary ASN coding and decoding processes are reduced, time delay in the UE switching process can be effectively reduced, system overhead can be effectively reduced in a multi-UE simultaneous fallback scene, and fallback failure caused by overlarge system overhead is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of the 3GPP 38.413 protocol defining HANDOVER REQUIRED and HANDOVER COMMAND messages.
FIG. 2 is a flow chart of the 3GPP 36.413 protocol definition HANDOVER REQUEST and HANDOVER REQUEST ACKNOWLEDGE messages.
Fig. 3 is a schematic diagram illustrating the 3GPP 36.331 protocol Handover Command definition.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and fig. 2, the present embodiment provides a method for improving execution efficiency in a process of switching a UE from an NR base station to an LTE base station, where the method includes:
the execution efficiency of the UE in the process of switching from the NR base station to the LTE base station is improved by redesigning a Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE message.
Furthermore, the method for redesigning the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE message comprises the following steps:
as shown in fig. 3, when preparing the Target to Source transmission Container cell, the LTE base station does not use the format of HANDOVER COMMAND signaling for encoding, but directly performs ASN encoding on the DL-DCCH-Message including the RRCConnectionReconfiguration cell, and then puts the DL-DCCH-Message into the Target to Source transmission Container cell, and brings the DL-DCCH-Message to the EPC through the HANDOVER REQUEST acknowledgement Message.
Therefore, the Target to Source transmission Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message does not carry the code stream coded by the HANDOVER COMMAND signaling any more, but carries the code stream coded by the DL-DCCH-Message. Then, when the UE is handed over from the NR base station to the LTE base station, after receiving the HANDOVER COMMAND signaling, the NR base station does not perform ASN decoding on the Target to Source transmission Container cell, but directly passes the corresponding code stream to the UE. Therefore, unnecessary ASN coding and decoding processes are reduced, time delay in the UE switching process can be effectively reduced, system overhead can be effectively reduced in a multi-UE simultaneous fallback scene (from an NR base station to an LTE base station), and fallback failure caused by overlarge system overhead is avoided.
Example 2
Based on the method for improving the execution efficiency of the UE in the process of switching from the NR base station to the LTE base station in embodiment 1, as shown in fig. 1, this embodiment provides a method for switching from the NR base station to the LTE base station, which includes the following steps:
s1, the NR base station initiates a HANDOVER REQUERED signaling to the 5GC, indicates that the UE needs to be switched from the NR base station to the LTE base station, the 5GC initiates a switch to a corresponding EPC, and the EPC converts the HANDOVER REQUERED signaling into a HANDOVER REQUEST and sends the HANDOVER REQUEST to the LTE base station;
s2, after the LTE base station finishes processing, the resynchronization information needed by the UE is returned to the EPC through a HANDOVER REQUEST ACKNOWLEDG message, and the EPC converts the HANDOVER REQUEST ACKNOWLEDG message into a HANDOVER COMMAND signaling and returns to the source NR base station; wherein, the HANDOVER REQUEST acknowledge message carries the redesigned Target to Source transfer Container cell; the code stream coded by the DL-DCCH-Message is carried in a Target to Source transfer Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message;
s3, after receiving the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE Message, the NR base station brings the code stream coded by the DL-DCCH-Message carried by the NR base station to the UE through a MobilityFromNRCommand instruction so as to complete the switching of the UE from the NR base station to the LTE base station.
Example 3
This embodiment provides a UE, wherein the UE performs handover from an NR base station to an LTE base station by using the handover method described in embodiment 2, and the specific steps are as follows:
s1, the NR base station initiates a HANDOVER REQUERED signaling to the 5GC, indicates that the UE needs to be switched from the NR base station to the LTE base station, the 5GC initiates a switch to a corresponding EPC, and the EPC converts the HANDOVER REQUERED signaling into a HANDOVER REQUEST and sends the HANDOVER REQUEST to the LTE base station;
s2, after the LTE base station finishes processing, the resynchronization information needed by the UE is returned to the EPC through a HANDOVER REQUEST ACKNOWLEDG message, and the EPC converts the HANDOVER REQUEST ACKNOWLEDG message into a HANDOVER COMMAND signaling and returns to the source NR base station; wherein, the HANDOVER REQUEST acknowledge message carries the redesigned Target to Source transfer Container cell; the code stream coded by the DL-DCCH-Message is carried in a Target to Source transfer Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message;
s3, after receiving the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE Message, the NR base station brings the code stream coded by the DL-DCCH-Message carried by the NR base station to the UE through a MobilityFromNRCommand instruction so as to complete the switching of the UE from the NR base station to the LTE base station.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for improving execution efficiency of UE in the process of switching from an NR base station to an LTE base station is characterized in that the method comprises the following steps:
the execution efficiency of the UE in the process of switching from the NR base station to the LTE base station is improved by redesigning a Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE message.
2. The method of claim 1, wherein the code stream encoded by the HANDOVER COMMAND signaling is not carried in a Target to Source transmission Container cell in the redesigned HANDOVER REQUEST acknowledgement Message, but is carried in a DL-DCCH-Message.
3. The method of claim 2, wherein the method of redesigning the Target to Source transfer Container cell in the HANDOVER REQUEST acknowledgement cell message comprises:
when preparing a Target to Source transmission Container cell, the LTE base station does not use the format of HANDOVER COMMAND signaling for coding, but directly performs ASN coding on a DL-DCCH-Message including an RRCConnectionReconfiguration cell, then puts the Message into the Target to Source transmission Container cell, and brings the Message to EPC through HANDOVER REQUEST acknowledgement Message.
4. The method of claim 2, wherein when the UE switches from the NR base station to the LTE base station, the NR base station does not perform ASN decoding on the Target to Source transmission Container cell after receiving the HANDOVER COMMAND signal, but directly passes the corresponding code stream to the UE.
5. A method for switching UE from an NR base station to an LTE base station is characterized by comprising the following steps:
s1, the NR base station initiates a HANDOVER REQUERED signaling to the 5GC, indicates that the UE needs to be switched from the NR base station to the LTE base station, the 5GC initiates a switch to a corresponding EPC, and the EPC converts the HANDOVER REQUERED signaling into a HANDOVER REQUEST and sends the HANDOVER REQUEST to the LTE base station;
s2, after the LTE base station finishes processing, the resynchronization information needed by the UE is returned to the EPC through a HANDOVER REQUEST ACKNOWLEDG message, and the EPC converts the HANDOVER REQUEST ACKNOWLEDG message into a HANDOVER COMMAND signaling and returns to the source NR base station; wherein, the HANDOVER REQUEST acknowledge message carries the redesigned Target to Source transfer Container cell; the code stream coded by the DL-DCCH-Message is carried in a Target to Source transfer Container cell in the redesigned HANDOVER REQUEST ACKNOWLEDGE Message;
s3, after receiving the Target to Source transfer Container cell in the HANDOVER REQUEST ACKNOWLEDGE Message, the NR base station brings the code stream coded by the DL-DCCH-Message carried by the NR base station to the UE through a MobilityFromNRCommand instruction so as to complete the switching of the UE from the NR base station to the LTE base station.
6. A UE, characterized in that the UE performs handover from an NR base station to an LTE base station using the handover method of claim 5.
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