CN114828106A - Method and user terminal for implementing mobility management - Google Patents
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
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Abstract
The present disclosure provides a method and a user terminal for implementing mobility management. The method for implementing mobility management comprises the following steps: in the process that a user terminal moves from a first base station to a second base station, wherein the first base station is an NR (non-reference) base station or an LTE (Long term evolution) base station, and the second base station is an NR base station, if the user terminal is in an idle state or an inactive state, broadcast information sent by a network side is received, cell reselection information associated with a network slice is obtained through the broadcast information, and cell reselection is carried out according to the cell reselection information so as to reside in the second base station supporting the network slice; and if the user terminal is in a connected state, receiving RRC release information sent by the network side, acquiring redirection information associated with the network slice through the RRC release information, and redirecting to a second base station supporting the network slice according to the redirection information.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a method and a user equipment for implementing mobility management.
Background
The network slice is an important characteristic of the 5G network, and can meet the customization requirements of operators for various industries, vertical markets and various virtual operation services. 3GPP (3rd Generation Partnership Project) has gradually developed a study on a network slice-related scenario and a system architecture from 2015. The network slice can enable a user to access to the most suitable network according to the requirement through the end-to-end configuration of the network, and the flexibility of network resources is improved. In the existing standard, most of the network slice work is realized at the core network side, and the access network matches the core network and interacts signaling in cooperation with the network slice indication of the core network.
According to the related art, the 5G system uniquely identifies an end-to-end Network Slice using S-NSSAI (Single Network Slice Selection assignment Information, Single Network Slice identification). The S-NSSAI comprises an SST (Slice/Service Type) for describing the main characteristics and network performance of the Slice, and also comprises an SD (Slice Difference) identifier, and the differential Slice identifier is further refined to identify the requirements of industry clients on the Slice. SD is optional information that can be supplemented into SSTs to distinguish between multiple network slices.
According to the existing protocol, one S-NSSAI can support up to 1024 network slices.
NSSAI (Network Slice Selection Assistant Information) is a collection of S-NSSAIs, representing a set of Network slices. NSSAI plays an important role in the slice selection process, and is divided into configured NSSAI, contracted NSSAI, requested NSSAI, allowed NSSAI, and rejected NSSAI according to the storage location and role thereof. The requested NSSAI is generated by the UE (User Equipment) according to the configured NSSAI and the allowed NSSAI, and may be carried in a RRC (Radio Resource Control) layer and NAS (Network Attached Storage) layer message of the initial registration message to identify the NSSAI requested to be used by the UE in the current registration.
The configured NSSAI represents an NSSAI pre-configured in the UE, and the NSSAI may be generated by an NSSF (Network Slice Selection Function) or an AMF (Access and Mobility Management Function) and issued to the UE, and is mainly used for generating a requested NSSAI used in initial registration.
The allowed NSSAI represents the NSSAI that the UE is allowed to access in the current registration area. The NSSF calculates and generates the NSSAI according to the requested NSSAI, the subscribed NSSAI and the relevant strategy, then transmits the NSSAI to the AMF and the UE (some scenes can be directly generated by the AMF), and stores the NSSAI in the UE and the AMF. The information indicates that a terminal supports up to 8S-NSSAIs.
As known from the conventional protocol, in order to support Radio resource management in a RAN (Radio Access Network), the AMF provides "RAT/RFSP Index (Index to Radio Access Technology/Frequency Selection Priority Index)" to the RAN through an N2 interface. The RFSP index is UE specific and applies to all radio bearers. The RAN uses the RFSP parameters to provide camping cell reselection priority for idle state terminals or to redirect active state terminals to different frequencies/RATs.
According to the existing protocols, mobility management of terminals is mainly divided into two categories: non-connected mobility management and connected mobility management. When the terminal is in an idle state or an inactive state, cell reselection is continuously performed to camp on a cell with higher priority/better signal quality. Specifically, the terminal acquires the common priority information of the frequency point through a broadcast message, or acquires the dedicated priority information of the frequency point through an RRC release message, or inherits from other RATs when performing inter-RAT cell (re) selection. If a dedicated priority is provided, the terminal will ignore all common priorities. And the terminal reselects the cell between the frequency points which appear in the system information and provide the priority according to the priority strategy so as to select the frequency point with the highest priority as much as possible.
The heterogeneous system mobile management process of the connected terminal can be realized through a redirection process, and the 5G system only supports the mobility with the 4G system. The redirection of the NR system is mainly realized by redirection information carried in the RRC release message.
Disclosure of Invention
The inventor finds, through research, that the following problems also exist in the related art for implementing network slice-based traffic redirection:
inability to implement network slice based cell reselection: at present, a cell reselection related parameter based on a network slice is lacked in a broadcast message, and an idle terminal can only perform cell reselection based on a frequency point priority related parameter in the broadcast message, but cannot access a base station supporting the network slice through the cell reselection.
Network slice based redirection cannot be achieved: at present, a redirection related parameter based on a network slice is lacked in an RRC release message, and a connected terminal can only redirect a service based on a frequency point priority related parameter in a broadcast message, but cannot access a base station supporting the network slice through redirection.
Inability to implement network slice-based inter-system reselection: the network slicing technology is a key technology of the 5G NR, and the current 4G LTE system does not support the network slicing technology.
Accordingly, the present disclosure provides a mobility management scheme, which can implement mobility management of a user terminal by means of network slice related parameters issued by a network side.
According to a first aspect of the embodiments of the present disclosure, there is provided a method for implementing mobility management, performed by a user terminal, including: receiving broadcast information sent by a network side in the process that the user terminal is in an idle state or an inactive state and moves from a first base station to a second base station, wherein the first base station is an NR base station or an LTE base station, and the second base station is an NR base station; acquiring cell reselection information associated with a network slice through the broadcast information; and performing cell reselection according to the cell reselection information so as to reside in the second base station supporting the network slice.
In some embodiments, the cell reselection information includes network slices supported within a tracking area and network slices supported by reselection frequency points.
In some embodiments, performing cell reselection according to the cell reselection information comprises: putting the network slices supported in the tracking area and the network slices supported by the reselection frequency point into a first network slice list to be selected; selecting a first network slice with a highest priority from the first list of network slices to be selected; determining a first frequency point list supporting the first network slice; detecting whether a tracking area where a first frequency point with the highest priority in the first frequency point list is located is a tracking area where the user terminal is located; and if the tracking area where the first frequency point is located is the tracking area where the user terminal is located, accessing the first frequency point.
In some embodiments, if the tracking area where the first frequency point is located is not the tracking area where the user terminal is located, selecting a first target frequency point from all frequency points in the first frequency point list except the first frequency point according to a sequence from high to low in frequency point priority, where the tracking area where the first target frequency point is located is the tracking area where the user terminal is located; and accessing the first target frequency point.
In some embodiments, the broadcast message includes at least one of a network slice identifier, a tracking area identifier, a mapping relationship between a tracking area identifier and a network slice identifier, a mapping relationship between a tracking area and a reselected frequency point, and a mapping relationship between a network slice and a frequency point.
In some embodiments, in the process that the user terminal is in a connected state and moves from a first base station to a second base station, receiving RRC release information sent by a network side; obtaining redirection information associated with a network slice through the RRC release information; redirecting to the second base station supporting network slicing according to the redirection information.
In some embodiments, redirecting to the second base station supporting network slicing in accordance with the redirection information comprises: if the redirection information comprises a network slice supported in a tracking area, a configured network slice supported by a redirection frequency point and an allowed network slice, putting the network slice supported in the tracking area, the configured network slice supported by the redirection frequency point and the allowed network slice into a second network slice list to be selected; selecting a second network slice with the highest priority from the second network slice list to be selected; determining a second frequency point list supporting the second network slice; detecting whether a tracking area where a second frequency point with the highest priority in the second frequency point list is located is a tracking area where the user terminal is located; and if the tracking area where the second frequency point is located is the tracking area where the user terminal is located, accessing the second frequency point.
In some embodiments, if the tracking area where the second frequency point is located is not the tracking area where the user terminal is located, selecting a second target frequency point from all frequency points in the second frequency point list except the second frequency point according to a sequence from high to low in frequency point priority, where the tracking area where the second target frequency point is located is the tracking area where the user terminal is located; and accessing the second target frequency point.
In some embodiments, if the redirection information includes frequency point priority information and does not include network slice information, accessing the frequency point with the highest priority according to the frequency point priority information.
In some embodiments, if the user terminal does not complete access if the timer of the RRC release message expires, the second base station is accessed using the priority related information of NSSAI in the broadcast message.
In some embodiments, the RRC release information includes at least one of redirection frequency point information, frequency point information for NR systems, a mapping relationship of a frequency point to a network slice, a mapping relationship of a frequency point to a tracking area, a network slice identification, a configured network slice list, an allowed network slice list, and a tracking area slice support list.
According to a second aspect of the embodiments of the present disclosure, there is provided a user terminal, including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method implementing any of the embodiments described above based on instructions stored by the memory.
According to a third aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, in which computer instructions are stored, and when executed by a processor, the computer-readable storage medium implements the method according to any of the embodiments described above.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a flow diagram of a method of implementing mobility management according to one embodiment of the present disclosure;
fig. 2 is a flow diagram of a method of implementing mobility management in accordance with another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a user terminal implementing mobility management according to an embodiment of the present disclosure.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials and values set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.
The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
Fig. 1 is a flow diagram of a method of implementing mobility management according to one embodiment of the present disclosure. In some embodiments, the following mobility management method steps are performed by the user terminal.
In step 101, in the process that the user terminal is in an idle state or an inactive state and moves from the first base station to the second base station, the broadcast information sent by the network side is received.
The first base station is an NR (New Radio, New air interface) base station or an LTE (Long Term Evolution) base station, and the second base station is an NR base station.
At step 102, cell reselection information associated with the network slice is obtained via the broadcast information.
In step 103, cell reselection is performed according to the cell reselection information to camp on a second base station supporting the network slice.
In some embodiments, the cell reselection information includes network slices supported within the tracking area and network slices supported by the reselection frequency point. The step of performing cell reselection according to the cell reselection information includes:
and placing the network slices supported by the tracking area and the network slices supported by the reselection frequency point into a first network slice list to be selected, selecting a first network slice with the highest priority from the first network slice list to be selected, and determining a first frequency point list supporting the first network slice. And then detecting whether the tracking area where the first frequency point with the highest priority in the first frequency point list is located is the tracking area where the user terminal is located. And if the tracking area where the first frequency point is located is the tracking area where the user terminal is located, accessing the first frequency point.
If the tracking area where the first frequency point is located is not the tracking area where the user terminal is located, selecting a first target frequency point from all frequency points in the first frequency point list except the first frequency point according to the sequence of the frequency point priorities from high to low, wherein the tracking area where the first target frequency point is located is the tracking area where the user terminal is located, and accessing the first target frequency point.
That is, if the first frequency point with the highest priority does not meet the requirement, the frequency point with the second priority meeting the requirement is selected for access.
In some embodiments, the broadcast information comprises at least one of:
-cell reselection common information: such as cellReselectionInfoCommon in the TS38.331 protocol SIB2
-cell reselection service frequency information: including cell reselection priority and reselection threshold
-cell reselection priority information: the absolute priority of the carrier frequency used for cell reselection ranges from 0 to 7, wherein 0 represents the lowest priority
-network slice identification: containing only a one byte SST network slice identifier, with no optional SD identifier by default. The network slice identification can distinguish at most 1024 network slices
-tracking area identification: consists of PLMN (Public Land Mobile Network) and tracking area code
Mapping of tracking areas to network slice identities: which network slices are supported within a configured tracking area
Network slice to frequency point mapping relation: network slice supported by reselecting frequency point
In some embodiments, if the first base station is an NR base station, the broadcast information may further include the following information:
-inter-frequency cell reselection frequency list: such as InterFreqCarrierFreqList in the TS38.331 protocol SIB4
-pilot carrier related information: InterFreqCarrierFreqInfo as in SIB4
Fig. 2 is a flow chart illustrating a method of implementing mobility management according to another embodiment of the present disclosure. In some embodiments, the following mobility management method steps are performed by the user terminal.
In step 201, in the process that the user terminal is in a connected state and moves from the first base station to the second base station, the RRC release information sent by the network side is received.
The first base station is an NR base station or an LTE base station, and the second base station is an NR base station.
In step 202, redirection information associated with the network slice is obtained through RRC release information.
In step 203, the second base station supporting the network slice is redirected according to the redirection information.
In some embodiments, if the redirection information includes a supported network slice, a configured network slice supported by the redirection frequency point, and an allowed network slice in the tracking area, the supported network slice, the configured network slice supported by the redirection frequency point, and the allowed network slice in the tracking area are placed in the second list of network slices to be selected. And selecting a second network slice with the highest priority from the second network slice list to be selected, and determining a second frequency point list supporting the second network slice. And then detecting whether the tracking area of the second frequency point with the highest priority in the second frequency point list is the tracking area of the user terminal, and if the tracking area of the second frequency point is the tracking area of the user terminal, accessing the second frequency point.
In some embodiments, if the tracking area where the second frequency point is located is not the tracking area where the user terminal is located, a second target frequency point is selected from all frequency points in the second frequency point list except the second frequency point according to the order of the priority levels of the frequency points from high to low, where the tracking area where the second target frequency point is located is the tracking area where the user terminal is located, and the second target frequency point is accessed.
In some embodiments, if the redirection information only includes the frequency point priority information and does not include the network slice information, the frequency point with the highest priority is accessed according to the frequency point priority information.
In some embodiments, if the user terminal does not complete access if the timer for the RRC release message expires, the second base station is accessed using the priority related information of NSSAI in the broadcast message.
In some embodiments, the RRC release message includes at least one of:
-redirection frequency point information: indicating access frequency points of a terminal, such as a redirectedcarrierInfo defined in TS38.331, which includes frequency point information carrierInfonR for an NR system and frequency point information redirectedcarrierInfo-EUTRA for an LTE system
Frequency point to network slice mapping relation: network slice indicating support of each frequency point
Frequency point to tracking area mapping relation: frequency points supported by tracking areas
-network slice identification: SST field of only one byte length, by default without optional SD identifier, which identifies two distinguishable up to 1024 network slices
-list of configured network slices: network slicing in a terminal adapted for one or more PLMNs
-list of allowed network slices: network slice that a terminal can use in a serving PLMN of a current registration area
-tracking area supported slice list: network slice supported per tracking area per PLMN or per SNPN
The present disclosure is illustrated by the following specific examples.
Implementing one step:
this embodiment describes a cell reselection procedure in which a ue in idle or inactive state moves from a first base station (LTE base station eNB1) to a second base station (NR base station gNB 1). The broadcast message includes information about network slices supported by the gNB 1. Each base station has only one cell.
Step 1: the user terminal obtains the priority information of cell reselection from the broadcast message, and the broadcast message includes but is not limited to the following information:
-cell reselection common information: such as cellReselectionInfoCommon in SIB2 of TS38.331 protocol
-cell reselection service frequency information: including cell reselection priority and reselection threshold
-cell reselection priority information: the absolute priority of the carrier frequency used for cell reselection has a length of 0-7, wherein 0 represents the lowest priority
-network slice identification: a network slice identifier comprising a one-byte SST that can distinguish up to 1024 network slices
-tracking area identification: composed of PLMN and tracking area code
Mapping of tracking areas to network slice identities: which network slices are supported within a configured tracking area
-tracking area to reselection frequency point mapping relation: cell reselection frequency point supported in tracking area
Network slice to frequency point mapping relation: network slice supported by reselecting frequency point
Step 2: after receiving the broadcast information, the user terminal determines the network slices supported in the tracking area, reselects the network slices supported by the frequency point, and defines all the finally determined network slices as a selectable network slice list.
And step 3: the user terminal selects the network slice with the highest priority in the range of the selectable network slice list, then selects the frequency point with the highest priority in the frequency point list supported by the network slice, and if the tracking area where the frequency point with the highest priority is located is the tracking area supported by the terminal, the frequency point is selected for access. Otherwise, selecting and accessing a target frequency point in the frequency point list according to the sequence of the frequency point priorities from high to low, wherein the tracking area where the target frequency point is located is the tracking area where the user terminal is located.
The second implementation:
this embodiment describes a traffic redirection procedure for a connected user terminal moving from a first base station (LTE base station eNB1) to a second base station (NR base station gNB 1). The RRC release message includes information about network slices supported by the gNB 1. Each base station has only one cell.
Step 1: and in the process that the user terminal moves from the first base station to the second base station, the terminal is redirected to the second base station by the first base station according to the priority configuration information in the RRC release message. The RRC release message includes, but is not limited to, the following information:
-redirection frequency point information: and indicating the access frequency point of the terminal, such as the redirectedCarrierInfo defined in the TS 38.331: frequency point information CarierInfo NR for NR system and frequency point information RedirectedCrierInfo-EUTRA for LTE system
Frequency point to network slice mapping relation: network slice indicating support of each frequency point
Frequency point to TA mapping: list of supported frequency points in the TA
-network slice identification: SST field only containing one byte length, capable of distinguishing up to 1024 network slices
-configured network slice list: network slicing in a terminal adapted for one or more PLMNs
-list of allowed network slices: network slice that a terminal can use in a serving PLMN of a current registration area
TAI slice support list: network slice supported per TAC per PLMN or per SNPN
Step 2: and the terminal selects a proper frequency point or network slice for access according to the priority configuration information in the RRC release message of the second base station, and if the RRC release message of the second base station only contains the frequency point priority information, the terminal accesses the high-priority frequency point according to the frequency point priority.
And step 3: after receiving the network slice information of the RRC release message of the second base station, the terminal determines the configured network slice list supported by the redirection frequency point and the network slices in the allowed network slice list, and defines the network slices as an optional network slice list.
And 4, step 4: the terminal selects the network slice with the highest priority from the selectable network slice list, determines the frequency point list supporting the network slice, selects the frequency point with the highest priority, then checks whether the tracking area mapped by the frequency point is the tracking area supported by the terminal, if so, the terminal accesses the frequency point, and if not, the terminal enters the frequency point with the next best priority supporting the tracking area.
And 5: if the terminal does not complete access before the timer for the RRC Release message expires, the terminal uses the priority of the common NSSAI in the broadcast message.
Fig. 3 is a schematic structural diagram of a user terminal implementing mobility management according to an embodiment of the present disclosure. As shown in fig. 3, the user terminal includes a memory 31 and a processor 32.
The memory 31 is used to store instructions. The processor 32 is coupled to the memory 31. The processor 32 is configured to perform a method as referred to in any of the embodiments of fig. 1 or fig. 2 based on instructions stored by the memory.
As shown in fig. 3, the user terminal further includes a communication interface 33 for information interaction with other devices. Meanwhile, the user terminal further comprises a bus 34, and the processor 32, the communication interface 33 and the memory 31 are communicated with each other through the bus 34.
The Memory 31 may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM). Such as at least one disk storage. The memory 31 may also be a memory array. The storage 31 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.
Further, the processor 32 may be a central processing unit, or may be an ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement embodiments of the present disclosure.
The present disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, which when executed by the processor implement a method according to any one of the embodiments of fig. 1 or fig. 2.
By implementing the above-described aspects of the present disclosure, at least one of the following advantages can be obtained:
1) the method and the device realize cell reselection based on network slices, and enable an idle or non-active terminal to reside in an NR base station supporting the network slices through cell reselection by adding cell reselection information related to the network slices in a broadcast message.
2) The method and the device realize service redirection based on the network slice, and the connected terminal can be redirected to the NR base station supporting the network slice in the moving process by adding redirection information related to the network slice in the RRC release message.
3) The method supports the inter-system reselection process based on the network slice, and the idle state terminal can be reselected and resided to the NR base station supporting the network slice by the LTE base station through a cell by adding network slice related inter-system reselection parameters in a broadcast message.
4) The method and the device have small influence on the terminal, and have good backward compatibility and deployment feasibility. The method and the device enhance the existing protocol, do not introduce a new protocol process, and have low implementation difficulty.
So far, embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (13)
1. A method for implementing mobility management, performed by a user terminal, comprising:
receiving broadcast information sent by a network side in the process that the user terminal is in an idle state or an inactive state and moves from a first base station to a second base station, wherein the first base station is an NR base station or an LTE base station, and the second base station is an NR base station;
acquiring cell reselection information associated with a network slice through the broadcast information;
and performing cell reselection according to the cell reselection information to reside in the second base station supporting network slice.
2. The method of claim 1, wherein the cell reselection information comprises network slices supported within a tracking area and network slices supported at reselection frequency points.
3. The method of claim 2, wherein performing cell reselection according to the cell reselection information comprises:
putting the network slices supported in the tracking area and the network slices supported by the reselection frequency point into a first network slice list to be selected;
selecting a first network slice with a highest priority from the first list of network slices to be selected;
determining a first frequency point list supporting the first network slice;
detecting whether a tracking area where a first frequency point with the highest priority in the first frequency point list is located is a tracking area where the user terminal is located;
and if the tracking area where the first frequency point is located is the tracking area where the user terminal is located, accessing the first frequency point.
4. The method of claim 3, further comprising:
if the tracking area where the first frequency point is located is not the tracking area where the user terminal is located, selecting a first target frequency point from all frequency points in the first frequency point list except the first frequency point according to the sequence of the frequency point priorities from high to low, wherein the tracking area where the first target frequency point is located is the tracking area where the user terminal is located;
and accessing the first target frequency point.
5. The method of any one of claims 1-4, wherein:
the broadcast message comprises at least one of a network slice identifier, a tracking area identifier, a mapping relation between the tracking area identifier and the network slice identifier, a mapping relation between the tracking area and a reselection frequency point, and a mapping relation between the network slice and the frequency point.
6. The method of claim 1, further comprising:
receiving RRC release information sent by a network side in the process that the user terminal is in a connected state and moves from a first base station to a second base station;
obtaining redirection information associated with a network slice through the RRC release information;
redirecting to the second base station supporting network slicing according to the redirection information.
7. The method of claim 6, wherein redirecting to the second base station supporting network slicing according to the redirection information comprises:
if the redirection information comprises a network slice supported in a tracking area, a configured network slice supported by a redirection frequency point and an allowed network slice, putting the network slice supported in the tracking area, the configured network slice supported by the redirection frequency point and the allowed network slice into a second network slice list to be selected;
selecting a second network slice with the highest priority from the second network slice list to be selected;
determining a second frequency point list supporting the second network slice;
detecting whether a tracking area where a second frequency point with the highest priority in the second frequency point list is located is a tracking area where the user terminal is located;
and if the tracking area where the second frequency point is located is the tracking area where the user terminal is located, accessing the second frequency point.
8. The method of claim 7, further comprising:
if the tracking area of the second frequency point is not the tracking area of the user terminal, selecting a second target frequency point from all frequency points in the second frequency point list except the second frequency point according to the sequence of the frequency point priorities from high to low, wherein the tracking area of the second target frequency point is the tracking area of the user terminal;
and accessing the second target frequency point.
9. The method of claim 7, further comprising:
and if the redirection information comprises frequency point priority information and does not comprise network slice information, accessing the frequency point with the highest priority according to the frequency point priority information.
10. The method of claim 6, further comprising:
if the user terminal does not finish accessing under the condition that the timer of the RRC release information is overtime, accessing the second base station by using the priority related information of NSSAI in the broadcast message.
11. The method of any one of claims 6-10, wherein:
the RRC release information comprises at least one of redirection frequency point information, frequency point information aiming at an NR system, a mapping relation between a frequency point and a network slice, a mapping relation between a frequency point and a tracking area, a network slice identifier, a configured network slice list, an allowed network slice list and a tracking area slice support list.
12. A user terminal, comprising:
a memory configured to store instructions;
a processor coupled to the memory, the processor configured to perform implementing the method of any of claims 1-11 based on instructions stored by the memory.
13. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-11.
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| PCT/CN2021/114041 WO2022151735A1 (en) | 2021-01-18 | 2021-08-23 | Method for implementing mobility management and user terminal |
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| WO2024197670A1 (en) * | 2023-03-29 | 2024-10-03 | 北京小米移动软件有限公司 | Cell reselection methods and apparatuses, communication apparatus and storage medium |
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