CN113709827B - Cell reselection method, user terminal and readable storage medium - Google Patents

Cell reselection method, user terminal and readable storage medium Download PDF

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Publication number
CN113709827B
CN113709827B CN202010441192.5A CN202010441192A CN113709827B CN 113709827 B CN113709827 B CN 113709827B CN 202010441192 A CN202010441192 A CN 202010441192A CN 113709827 B CN113709827 B CN 113709827B
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frequency
cell
frequency band
priority information
user terminal
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CN113709827A (en
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邓云
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • 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
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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

Abstract

A cell reselection method, a user terminal and a readable storage medium. The method comprises the following steps: when receiving new frequency selectable priority information configured by a service cell, receiving first NR frequency band information broadcasted by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by PLMN selected by the user terminal; and when the user terminal does not support NR frequency bands in the first NR frequency band information as EN-DC frequency band combination, using the original frequency priority information to reselect the cell. By applying the scheme, the success rate of establishing the double connection can be improved, and the cell reselection efficiency is further improved.

Description

Cell reselection method, user terminal and readable storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a cell reselection method, a user terminal, and a readable storage medium.
Background
For a New Radio (NR) cell that is not independently deployed, a User Equipment (UE) cannot camp on the New air cell in an idle state, and the network configures dual connectivity for a UE supporting long term evolution (Long Term Evolution, LTE) and NR dual connectivity (LTE-NR Dual Connectivity, EN-DC) so that the UE can use NR for data transmission. An LTE and NR dual-connectivity UE may be configured, referred to as an EN-DC capable UE, i.e. the UE allows simultaneous access to an LTE base station and an NR base station.
For the UE supporting EN-DC, in order to fully utilize the radio resource provided by the NR side, the UE supporting EN-DC needs to be booted and resides in the LTE serving cell where dual connectivity can be configured, so that after the UE enters a connected state, the network can configure dual connectivity for the UE and provide high-speed data service by utilizing the radio resource of the NR side.
In order to guide the UE to camp on the LTE cell where dual connectivity can be configured, the network newly configures some frequency selectable priorities in the system message, which is simply referred to as new frequency selectable priority (alt Cell Reselection Priority) information in the present invention. But in the system message received before the new frequency optional priority configuration, the base station also configures the frequency priority for the frequency, and in the invention, the frequency is simply called as the original frequency priority (configured by cell Reselection Priority) information. Thus, there may be two frequency priorities for reselection for one frequency.
Currently, for EN-DC enabled UEs, new frequency selective priority information may be employed, and priority camping in EN-DC enabled cells may be achieved, as the network may configure the appropriate new frequency selective priority to achieve this effect.
However, UEs are capability-limiting, one UE can only support dual connectivity in certain LTE Band (LTE Band) and NR Band (NR Band) combinations. When the UE resides in a Band Combination (BC) that is not supported by the UE, the UE cannot establish dual connectivity after entering the connected state, and after the UE resides in the LTE cells, the LTE cells may be overloaded, which is not beneficial for the user to develop services.
Disclosure of Invention
The invention aims to solve the problems that: the success rate of the establishment of the double connection is improved, and the cell reselection efficiency is further improved.
In order to solve the above problems, an embodiment of the present invention provides a cell reselection method, which is applicable to a user terminal supporting EN-DC, and the method includes:
When receiving new frequency selectable priority information configured by a service cell, receiving first NR frequency band information broadcasted by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by PLMN selected by the user terminal;
And when the user terminal does not support NR frequency bands in the first NR frequency band information as EN-DC frequency band combination, using the original frequency priority information to reselect the cell.
Optionally, the method further comprises: and when the user terminal does not support the reselection target LTE frequency as the EN-DC frequency band combination, performing cell reselection on the reselection target LTE frequency by using the original frequency priority information.
Optionally, the method comprises: and when the first NR frequency band information broadcast by the service cell is not received, using the original frequency priority information to reselect the cell.
Optionally, the method comprises: and when the first NR frequency band information broadcast by the service cell is not received, using the new frequency selectable priority information to reselect the cell.
Optionally, the method comprises: when the first NR frequency band information broadcast by the service cell is not received and the new frequency selectable priority information contains the LTE frequency of the EN-DC frequency band combination supported by the user terminal, performing cell reselection on the LTE frequency of the EN-DC frequency band combination supported by the user terminal contained in the new frequency selectable priority information by using the new frequency selectable priority information; and carrying out cell reselection on the LTE frequency of the EN-DC frequency band combination which is not supported by the user terminal and contained in the new frequency selectable priority information by using the original frequency priority information.
Optionally, the method further comprises: and when the user terminal supports the NR frequency band in the first NR frequency band information to be used as an EN-DC frequency band combination, using the new frequency selectable priority information to reselect a cell.
Optionally, before using the new frequency selectable priority information for cell reselection, the method further includes:
Judging whether the user terminal supports LTE frequency in the new frequency selectable priority information and NR frequency bands in the first NR frequency band information to be used as EN-DC frequency band combination;
and when the user terminal supports the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information are used as EN-DC frequency band combination, using the new frequency selectable priority information to reselect a cell.
Optionally, before the receiving the first NR frequency band information broadcast by the serving cell, the method further includes:
Judging whether the reselection target frequency is in a preset frequency range or not;
And when the reselection target frequency is in a preset frequency range, using the new frequency selectable priority information to reselect the cell, otherwise, receiving first NR frequency band information broadcasted by the service cell, and performing cell reselection based on the first NR frequency band information.
Optionally, after receiving the new frequency selectable priority information configured by the serving cell, before receiving the first NR frequency band information broadcast by the serving cell, the method further includes:
and when the user terminal supports to reside in an NR cell and the UE detects a reselection target NR cell, using the original frequency priority information to conduct cell reselection.
The embodiment of the invention also provides a user terminal, which comprises:
The receiving unit is suitable for receiving first NR frequency band information broadcasted by a service cell when receiving new frequency selectable priority information configured by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by PLMN selected by the user terminal;
and the first cell reselection unit is suitable for carrying out cell reselection by using the original frequency priority information when the user terminal does not support NR frequency bands in the first NR frequency band information as EN-DC frequency band combination.
Optionally, the user terminal further includes: and the second cell reselection unit is suitable for performing cell reselection on the reselection target LTE frequency by using the original frequency priority information when the user terminal does not support the reselection target LTE frequency as the EN-DC frequency band combination.
Optionally, the user terminal further includes: and the third cell reselection unit is suitable for carrying out cell reselection by using the original frequency priority information when the first NR frequency band information broadcast by the service cell is not received.
Optionally, the user terminal further includes: and a fourth cell reselection unit adapted to perform cell reselection using the new frequency selectable priority information when the first NR frequency band information broadcast by the serving cell is not received.
Optionally, the user terminal further includes: and a fifth cell reselection unit, configured to, when the first NR frequency band information broadcast by the serving cell is not received and the new frequency selectable priority information includes an LTE frequency of an EN-DC frequency band combination supported by the user terminal, perform cell reselection on the LTE frequency of the EN-DC frequency band combination supported by the user terminal included in the new frequency selectable priority information by using the new frequency selectable priority information, and perform cell reselection on the LTE frequency of the EN-DC frequency band combination not supported by the user terminal included in the new frequency selectable priority information by using the original frequency priority information.
Optionally, the user terminal further includes: and a sixth cell reselection unit adapted to perform cell reselection by using the new frequency selectable priority information when the user terminal supports the NR frequency band in the first NR frequency band information as an EN-DC frequency band combination.
Optionally, the user terminal further includes:
A first judging unit, adapted to judge whether the user terminal supports LTE frequency in the new frequency selectable priority information and NR frequency band in the first NR frequency band information as EN-DC frequency band combination before cell reselection using the new frequency selectable priority information;
And a seventh cell reselection unit, adapted to use the new frequency selectable priority information to perform cell reselection when the user terminal supports the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information is used as an EN-DC frequency band combination.
Optionally, the user terminal further includes:
The second judging unit is suitable for judging whether the reselection target frequency is in a preset frequency range or not;
And an eighth cell reselection unit, adapted to use the new frequency selectable priority information to perform cell reselection when the reselection target frequency is within a preset frequency range, otherwise, receive first NR frequency band information broadcasted by the serving cell, and perform cell reselection based on the first NR frequency band information.
Optionally, the user terminal further includes:
and a ninth cell reselection unit adapted to perform cell reselection using the original frequency priority information when the UE supports camping on an NR cell and the UE detects a reselection target NR cell after the receiving of the new frequency selectable priority information configured by the serving cell and before the receiving of the first NR frequency band information broadcasted by the serving cell.
The embodiment of the invention also provides a user terminal, which comprises a memory and a processor, wherein the memory stores a computer program capable of running on the processor, and the processor executes the steps of any one of the methods when running the computer program.
Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program for execution by a processor to perform the steps of any of the methods described above.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
By adopting the scheme, when the UE does not support the NR frequency band in the first NR frequency band information as the EN-DC frequency band combination, the original frequency priority information is used for cell reselection, so that the situation that the UE resides in the frequency band combination which is not supported by the UE is avoided, the success rate of dual connection establishment is improved, and the cell reselection efficiency is further improved.
Further, when the UE does not support the reselection target LTE frequency as the EN-DC frequency band combination, the cell reselection is performed on the reselection target LTE frequency by using the original frequency priority information, so that the frequency band combination which is not supported by the UE and resided in the UE can be further avoided, the success rate of dual connection establishment is improved, and the cell reselection efficiency is further improved.
Further, when the first NR frequency band information broadcast by the serving cell is not received, if the new frequency selectable priority information includes the LTE frequency of the EN-DC frequency band combination supported by the UE, the new frequency selectable priority information is used to reselect the cell for the LTE frequency of the EN-DC frequency band combination supported by the UE included in the new frequency selectable priority information, otherwise, the original frequency priority information is used to reselect the cell, which can also avoid residing in the frequency band combination not supported by the original frequency priority information, and improve the success rate of dual-connection establishment, thereby improving the cell reselection efficiency.
Further, before receiving the first NR frequency band information broadcasted by the serving cell, determining whether the reselection target frequency is within a preset frequency range, and when the reselection target frequency is within the preset frequency range, performing cell reselection by using new frequency selectable priority information, otherwise, receiving the first NR frequency band information broadcasted by the serving cell, and performing cell reselection based on the first NR frequency band information, thereby further improving cell reselection efficiency.
Further, when the UE supports to reside in the NR cell and the UE detects the reselection target NR cell, the original frequency priority information is directly used for cell reselection, so that the cell reselection efficiency of the UE supporting independent deployment of the NR cell is improved.
Drawings
Fig. 1 is a flowchart of a cell reselection method in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a user terminal according to an embodiment of the present invention.
Detailed Description
After introducing the NR, since the NR is typically deployed in a hot spot area and the NR is typically deployed with a high frequency, the coverage area of the NR cell is small, and the NR cell may not be deployed independently, for example, may not broadcast a system message, a paging message, or the like.
An EN-DC configured UE has an LTE base station connected to the UE as a master base station (MN) of the UE, and an NR base station as a slave base Station (SN) of the UE. The UE receives the system message and the paging message from a primary cell (PCell) on the primary base station side, the primary base station is responsible for transmission of radio resource control (Radio Resource Control, RRC) signaling, the secondary base station is responsible for configuration of a secondary cell group (Secondary Cell Group, SCG), and the primary base station and the secondary base station can both configure multiple serving cells to the UE.
In order to guide the UE to camp on the LTE cell where dual connectivity can be configured, the network side is newly configured with new frequency selective priority (alt Cell Reselection Priority) information in the system message. However, in the original system message, the base station sets priorities of different frequencies according to different frequencies, namely the original frequency priority (configured by cell Reselection Priority). Thus, there may be two frequency priorities for reselection for one frequency.
For UEs that do not support EN-DC or cannot identify new frequency selectable priority information, cell reselection is performed using the original frequency priority information broadcast by the base station. But for EN-DC enabled UEs, cell reselection will be performed with an optional priority (i.e. new frequency optional priority information) broadcast by the base station. The network side can reasonably set the new frequency selectable priority information so that the UE supporting the EN-DC is preferentially resided in the cell supporting the EN-DC.
In practice, however, UEs are capability-limiting, one UE being only able to support EN-DC in certain combinations of LTE and NR bands. When the UE camps on a combination of frequency bands that is not supported by itself, the UE cannot establish EN-DC after entering a connected state, so in this scenario, it is not appropriate for the UE to preferentially camp on a cell supporting EN-DC.
In view of the above problems, an embodiment of the present invention provides a cell reselection method, when a UE does not support an NR frequency band in the first NR frequency band information broadcasted by a serving cell, as an EN-DC frequency band combination, the cell reselection is performed by using original frequency priority information, thereby avoiding a frequency band combination that the UE resides in a frequency band combination that is not supported by the UE, improving a success rate of dual connection establishment, and further improving a cell reselection efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Referring to fig. 1, an embodiment of the present invention provides a cell reselection method, which is applicable to a UE supporting EN-DC. In particular, the method may comprise the steps of:
And step 11, when receiving the new frequency selectable priority information configured by the service cell, receiving first NR frequency band information broadcasted by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by a PLMN selected by the user terminal.
In a mobile communication system, the change of the UE resident cells in an idle state and an inactive state is completed through a cell reselection process, the target cell needs to be detected, and the cell reselection is performed in the cells meeting the requirements.
In the embodiment of the invention, the new frequency selectable priority information, namely, the frequency selectable priority information newly configured in the system message by the network side in order to guide the UE to reside in the LTE cell capable of configuring double connection. The base station can configure the new frequency selectable priority information through a system message, or can configure the new frequency selectable priority information through an RRC connection release message by the base station.
And the original frequency priority information is frequency priority information configured by the network according to the frequency in the system message before the new frequency selectable priority information is configured relative to the new frequency selectable priority information. The network may set priorities of different frequencies according to load conditions between cells, so that idle UEs reside in cells with low load. For the original frequency priority information, reference may be made to the rule in LTE RELEASE 8, which is not described herein.
In an embodiment of the present invention, either the new frequency selectable priority information or the original frequency priority information is prioritized for the frequency used for reselection. The original frequency priority information divides all frequencies used for reselection into a plurality of groups, each group is allocated with one priority, and the new frequency selectable priority information divides the frequencies used for reselection and configurable EN-DC into a plurality of groups, and each group is allocated with one priority. In this process, each group may have only one frequency or multiple frequencies.
In a specific implementation, the frequency priority may be set according to the PLMN, and for the UE, the frequency priority corresponding to the PLMN selected by the UE or the registered PLMN may be applied.
In an implementation, each cell may broadcast first NR frequency band information, e.g., the first NR frequency band information that may indicate that EN-DC may be established through a system message (SIB). The first NR frequency band information is an NR frequency band in EN-DC supported by a public land mobile network (Public Land Mobile Network, PLMN) selected by the UE, that is, a cellular mobile communication network of a certain system of a certain operator currently selected by the UE, and specifically, which NR frequency bands support EN-DC.
When the first NR frequency band information is received, step 12 is performed, otherwise step 15 is performed.
And step 12, judging whether the user terminal supports NR frequency bands in the first NR frequency band information as EN-DC frequency band combination.
In practice, the UE can usually only support EN-DC in certain combinations of LTE bands (LTE Band) and NR bands (NR Band), which are determined by the radio frequency device of the UE and are not changed at will. An Xn interface is established between different LTE cells and corresponding NR cells to establish EN-DC for the UE.
When the UE does not support the NR frequency bands in the first NR frequency band information as the EN-DC frequency band combination, that is, the UE does not support any one of the NR frequency bands in the first NR frequency band information as the EN-DC frequency band combination, step 13 is performed, otherwise step 14 is performed.
And step 13, when the UE does not support the NR frequency band in the first NR frequency band information as the EN-DC frequency band combination, using the original frequency priority information to reselect the cell.
And step 14, when the UE supports the NR frequency band in the first NR frequency band information to be used as the EN-DC frequency band combination, the new frequency selectable priority information is used for cell reselection.
The following is illustrative:
The UE camps on LTE serving Cell1 (frequency F1, belonging to LTE Band 1), and has neighbor Cell2 (F2, LTE Band 2), neighbor Cell 3 (F3, LTE Band 3), and neighbor Cell 4 (F1, LTE Band 1) around it.
It is further assumed that the first NR frequency band information for each cell is as follows:
The serving Cell1 can establish dual connection with NR bands n1 and n2, and here refers to establishment of EN-DC for connected UE;
Cell 4, which can establish a dual connection with NR bands n1, n 3;
cell 2, which can establish a dual connection with NR Band n4;
cell3, does not support establishment of EN-DC.
Cell1 sets the priorities of the several frequencies by the original frequency priority information in which frequencies F1, F2, and F3 are the same frequency priority.
Assume that the combinations of frequency bands supported by UE1, UE2, and UE3 residing in Cell1 are as follows:
In the case of UE1 residing in Cell1, the combination of frequency bands supporting EN-DC includes: LTE Band 1+nrband n1, LTE Band 1+nrband n2.
For UE2 residing in Cell1, the combination of frequency bands supporting EN-DC includes LTE Band 1+nrband n1, LTE Band 1+nrband n3.
For UE3 residing in Cell1, the combination of frequency bands supporting EN-DC includes only LTE Band 1+nrband n1.
Therefore, for UE1, since the combination of frequency bands supporting EN-DC includes LTE Band 1+nrband 1, LTE Band 1+nrband 2, and NR bands (NR Band1 and NR Bandn 2) in the first NR Band information that UE1 can support are included, the UE1 can use the new frequency selective priority information for cell reselection.
For UE2, since the Band combination supporting EN-DC includes LTE Band1+n1, LTE Band1+n3, which includes NR Band (NR Band n 1) in the first NR Band information that UE2 can support, UE2 can use the new frequency selective priority information configured by Cell1 to perform Cell reselection in Cell 1.
For UE3, since the combination of frequency bands supporting EN-DC includes only LTE Band 1+nrband n1, and includes the NR Band (NR Band n 1) in the first NR Band information that UE3 can support, UE3 can use the new frequency selective priority information configured by Cell1 to perform Cell reselection in Cell 1.
It is assumed that in order for the EN-DC enabled UE to preferentially camp on the EN-DC enabled serving cell, the network sets the frequency priorities of frequencies F1, F2 through the new frequency priority information, sets the frequency priority of F1 higher than the frequency priority of F2, and the frequency priority of F2 higher than the frequency priority of F3.
UE1 performs Cell reselection in Cell1 using the new frequency selective priority information, considering the order of frequency priorities as F1> F2> F3.UE1 needs to order cells on frequency F1 and as long as there are cells on the frequency that meet a preset threshold, the UE continues to camp on the frequency.
If UE1 finds that the signal quality of Cell4 is better than that of Cell1, UE1 reselects to Cell4. When UE1 camps in Cell4, cell reselection is performed according to the original frequency priority information and the new frequency priority information broadcast by Cell4. At this time, UE1 finds that Cell4 can establish dual connection with NR bands n1, n3, and the frequency Band combination supporting EN-DC by itself includes LTE Band1+ NR Bandn1, so UE1 can continue to perform Cell reselection using the new frequency priority information configured by Cell4.
The UE2 performs Cell reselection using the new frequency selectable priority information in the Cell1, and it is assumed that the UE2 reselects to the Cell2 according to the reselection rule, and the Cell2 only supports establishment of dual connection with the NR Band n4 (combined into LTE Band 2+nrband n 4), so after the UE enters the Cell2, the Cell reselection cannot be performed using the new frequency priority information configured by the Cell2, and the Cell reselection is performed using the original frequency priority information configured by the Cell 2.
For UE3, cell reselection using the new frequency selective priority information in Cell1 may continue to stay in Cell1 for a period of time before reselection to Cell 2. After the UE enters Cell2, cell reselection needs to be performed by using the primary frequency priority information configured by Cell 2.
Of course, how to set the priority of each frequency is not limiting to the present invention, for example, F1 and F2 may be set to have the same frequency priority and each may be set to be higher than the frequency priority of F3, which is not limited herein.
In an embodiment of the present invention, before using the new frequency selectable priority information for cell reselection, the method may further include: and when the user terminal does not support the reselection target LTE frequency as the EN-DC frequency band combination, performing cell reselection on the reselection target LTE frequency by using the original frequency priority information.
That is, before using the new frequency selectable priority information to perform cell reselection, after determining a reselection target LTE frequency (or referred to as a reselection candidate LTE frequency, i.e., an LTE frequency that can be reselected by the UE can be determined according to the system message configuration), determining whether the reselection target LTE frequency is an LTE frequency in the EN-DC band combination supported by the UE, if yes, performing cell reselection using the new frequency selectable priority information for the reselection target LTE frequency; otherwise, for the reselection target LTE frequency, the original frequency priority information is used for cell reselection.
In another embodiment of the present invention, before using the new frequency selectable priority information for cell reselection, it may include:
Judging whether the user terminal supports LTE frequency in the new frequency selectable priority information and NR frequency bands in the first NR frequency band information to be used as EN-DC frequency band combination;
and when the user terminal supports the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information are used as EN-DC frequency band combination, using the new frequency selectable priority information to reselect a cell.
At this time, the UE does not need to read the system message of the target cell, so that the LTE frequency where the target cell is located (i.e., the target LTE frequency where the UE performs reselection) and which NR frequency bands can perform EN-DC can not be predicted, if the new frequency selectable priority information is directly applied to perform cell reselection at this time, the UE reselects to an LTE cell, but the EN-DC BC supported by the cell is not supported by the UE, and the UE needs to reuse the original frequency priority information to perform reselection.
Therefore, in order to improve the reselection efficiency, when the reselection target LTE frequency is not determined, the UE may directly determine whether the UE supports the LTE frequency in the new frequency selectable priority information, and combine with the NR frequency band in the first NR frequency band information as the EN-DC frequency band. And when the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information are supported and serve as an EN-DC frequency band group, the new frequency selectable priority information is used for cell reselection.
For example, in the above embodiment, the UE camps on LTE serving Cell1 (frequency F1, belonging to LTE Band 1), and there are neighbor Cell2 (F2, LTE Band 2), neighbor Cell 3 (F3, LTE Band 3), and neighbor Cell 4 (F1, LTE Band 1) around.
Assume that Cell1 sets new frequency selectable priority information of priorities among F1 (Band 1), F2 (Band 2), and F3 (Band 3).
There are SIB in Cell1 indicating NR Band n1 and n2 where EN-DC can be established, i.e. six combinations of LTE Band 1+NR Band n1,LTE Band 1+NR Band n2,LTE Band 2+NR Band n1, … …, LTE Band3+ NR Band n2 are supported by the Cell.
Assuming that the Band combination in which UE4 supports EN-DC includes LTE band1+nrband n1, LTE band2+nrband n2, UE4 first determines whether it supports EN-DC Band combination of LTE Band and NR Band before using the new frequency selective priority information for cell reselection.
For frequencies F1 and F2, UE4 finds that the corresponding frequency band combination can be supported, so that new frequency selectable priority information corresponding to frequencies F1 and F2 is applied, i.e. when cell reselection is implemented, for frequencies F1 and F2, cell reselection is performed using the priority indicated by the new frequency selectable priority information. For frequency F3, UE4 does not support the corresponding frequency band combination, so for frequency F3, UE4 uses the original frequency priority information for cell reselection.
It should be noted that, before step 12 is executed, it may be determined whether the reselection target LTE frequency is an LTE frequency in the EN-DC band combination supported by the UE, or after step 12 is executed, it may be determined whether the reselection target LTE frequency is an LTE frequency in the EN-DC band combination supported by the UE, or while step 12 is executed, it may be determined whether the reselection target LTE frequency is an LTE frequency in the EN-DC band combination supported by the UE, and only if the reselection target frequency is a band combination supported by the UE, the cell reselection is performed using the new frequency selectable priority information.
In an embodiment of the present invention, the service message may not broadcast the first NR frequency band information, and at this time, the UE cannot receive the first NR frequency band information, and the UE supporting EN-DC may use the original frequency priority information to perform cell reselection, or may use the new frequency selectable priority information to perform cell reselection.
In another embodiment of the present invention, step 15 is performed when the UE does not receive the first NR frequency band information broadcast by the serving cell.
And 15, when the UE does not receive the first NR frequency band information broadcast by the serving cell, judging whether the new frequency selectable priority information contains the LTE frequency of the EN-DC frequency band combination supported by the user terminal.
And when the new frequency selectable priority information contains the LTE frequency of the EN-DC frequency band combination supported by the user terminal, executing a step 14, otherwise executing a step 13.
That is, for the LTE frequencies of the EN-DC band combination supported by the user terminal included in the new frequency selectable priority information, cell reselection is performed using the new frequency selectable priority information. And carrying out cell reselection on the LTE frequency of the EN-DC frequency band combination which is not supported by the user terminal and contained in the new frequency selectable priority information by using the original frequency priority information.
In an implementation, if the UE does not receive the first NR frequency band information broadcast by the serving cell, the LTE frequency of the EN-DC frequency band combination supported by the UE in the new frequency selectable priority information may be directly determined.
For example, in the new frequency selectable priority information, the EN-DC Band combination supported by the UE1 is LTE Band 1+nrband n1, LTE Band 1+nrband n2. Then, for the corresponding LTE frequency in LTE Band1, for example, a frequency belonging to LTE Band1, the new frequency selectable priority information may be used for cell reselection. And for LTE frequencies in other LTE frequency bands, performing cell reselection by using the original frequency priority information.
In an embodiment of the present invention, in order to further improve reselection efficiency, it may be determined whether the reselection target frequency (or referred to as a candidate frequency) is within a preset frequency range before receiving the first NR frequency band information broadcast by the serving cell. And when the reselection target frequency is in a preset frequency range, using the new frequency selectable priority information to reselect the cell, otherwise, receiving first NR frequency band information broadcasted by the service cell, and performing cell reselection based on the first NR frequency band information.
Specifically, the UE first enters a connection state to develop a service, the base station acquires the capability of the UE, and when the base station releases the RRC connection of the UE, the base station can determine, according to the EN-DC frequency band combination supported by the UE and the deployment scenario of the current serving cell peripheral network: in a nearby zone, cells of one or more LTE frequencies and NR cells may establish EN-DC combinations for a UE that are supported by the UE.
Thus, when the base station releases the RRC connection of the UE, the base station may set an optional priority of one or more frequencies, and optionally may set a block area, such as a cell list or a location area list, etc., and after the UE enters the idle state, the new frequency optional priority information is applied on one or more frequencies indicated by the base station. If the base station configures an area, the UE applies new frequency selectable priority information in the area. When the UE leaves this area, the UE performs cell reselection using the original frequency priority information provided in the cell system message.
The preset frequency range may be set by the base station according to an actual situation, which is not described herein.
When the reselection target frequency is in the preset frequency range, the new frequency selectable priority information is directly used for cell reselection without continuously receiving the first NR frequency band information broadcasted by the service cell, so that the reselection efficiency can be effectively improved.
In an implementation, after the cell broadcasts the NR frequency band supporting EN-DC, the cell also broadcasts the NR frequency band that can be independently deployed (standalone), because the UE can identify NR frequencies that the UE can reselect from the system message, such as NR frequencies configured by SIB24 in the LTE system that can implement cell reselection, where the frequencies are NR frequencies that can be independently deployed, where the UE can camp on to receive the system message, paging, and so on.
For a UE supporting EN-DC and a UE supporting an independently deployed NR cell (i.e., a NR cell may be reselected, wireless communication may be performed on the NR side, and may become a UE supporting NR independent deployment), if the UE does not find an optional NR neighbor cell, cell reselection is performed by applying new frequency optional priority information according to the scheme described in the above embodiment. If the UE discovers the selectable NR neighbor cell, the original frequency priority information is used for the LTE frequency configured with the new frequency selectable priority information, so that the UE prefers NR independently deployed cells (namely NR cells), and the cell reselection efficiency of the UE supporting the independent deployment of NR cells is convenient to improve.
Or for a UE supporting EN-DC and a UE supporting an independently deployed NR cell, the UE uses the original frequency priority information for the LTE frequency configured with the new frequency selectable priority information so that the UE prefers the NR cell whenever the serving cell is found to configure the reselected NR frequency in SIB 24.
As can be seen from the above, the cell reselection method in the embodiment of the present invention can enable the UE supporting EN-DC to reselect preferentially to the LTE serving cell configured with EN-DC, and enable the UE to camp on the cell with the EN-DC frequency band combination supported by the UE itself, so that the cell reselection efficiency is higher.
In order to better understand and implement the present invention, a detailed description of the apparatus and computer readable storage medium corresponding to the above method is provided below.
Referring to fig. 2, an embodiment of the present invention further provides a user terminal 20, where the user terminal 20 may include: the receiving unit 21 and the first cell reselection unit 22. Wherein:
the receiving unit 21 is adapted to receive, when receiving new frequency selectable priority information configured by a serving cell, first NR frequency band information broadcasted by the serving cell, where the first NR frequency band information is an NR frequency band in EN-DC supported by a PLMN selected by the user terminal;
The first cell reselection unit 22 is adapted to use the original frequency priority information for cell reselection when the user terminal 20 does not support the NR frequency bands in the first NR frequency band information as EN-DC frequency band combinations.
In an embodiment of the present invention, the user terminal 20 may further include: the second cell reselection unit 23 is adapted to perform cell reselection on the reselection target LTE frequency using the original frequency priority information when the user terminal 20 does not support the reselection target LTE frequency as EN-DC band combination.
In an embodiment of the present invention, the user terminal 20 may further include: the third cell reselection unit 24 is adapted to use the original frequency priority information for cell reselection when the first NR frequency band information broadcast by the serving cell is not received.
In an embodiment of the present invention, the user terminal 20 may further include: a fourth cell reselection unit (not shown) adapted to perform cell reselection using the new frequency selectable priority information when the first NR frequency band information broadcast by the serving cell is not received.
In an embodiment of the present invention, the user terminal 20 may further include: a fifth cell reselection unit 25, adapted to, when the first NR frequency band information broadcast by the serving cell is not received and the new frequency selective priority information includes an LTE frequency of an EN-DC frequency band combination supported by the user terminal, perform cell reselection on the LTE frequency of the EN-DC frequency band combination supported by the user terminal included in the new frequency selective priority information by using the new frequency selective priority information; and carrying out cell reselection on the LTE frequency of the EN-DC frequency band combination which is not supported by the user terminal and contained in the new frequency selectable priority information by using the original frequency priority information.
In an embodiment of the present invention, the user terminal 20 may further include: a sixth cell reselection unit 26 is adapted to use the new frequency selectable priority information for cell reselection when the user terminal supports NR frequency bands in the first NR frequency band information as EN-DC frequency band combination.
In an embodiment of the present invention, the user terminal 20 may further include:
a first judging unit 27 adapted to judge whether the user terminal supports LTE frequencies in the new frequency selectable priority information, and NR frequency bands in the first NR frequency band information, as EN-DC frequency band combinations, before cell reselection using the new frequency selectable priority information;
A seventh cell reselection unit 28 adapted to use the new frequency selectable priority information for cell reselection when the user terminal supports LTE frequencies in the new frequency selectable priority information in combination with NR bands in the first NR band information as EN-DC bands.
In an embodiment of the present invention, the user terminal 20 further includes:
A second judging unit 29 adapted to judge whether the reselection target frequency is within a preset frequency range;
And an eighth cell reselection unit 30, adapted to use the new frequency selectable priority information to perform cell reselection when the reselection target frequency is within a preset frequency range, otherwise, receive first NR frequency band information broadcasted by the serving cell, and perform cell reselection based on the first NR frequency band information.
In an embodiment of the present invention, the user terminal 20 may further include:
A ninth cell reselection unit 31, adapted to use the original frequency priority information to perform cell reselection when the UE supports camping on an NR cell and the UE detects a reselection target NR cell after the receiving of the new frequency selectable priority information configured by the serving cell and before the receiving of the first NR frequency band information broadcasted by the serving cell.
For each unit of the above-mentioned user terminal 20, reference may be made to the description of the corresponding portion in the cell reselection method, which is not repeated here.
In an embodiment of the present invention there is also provided another user terminal comprising a memory and a processor, the memory having stored thereon a computer program capable of running on the processor, the processor executing the steps of the method of any of the embodiments described above when the computer program is run.
There is also provided in an embodiment of the invention a computer readable storage medium having stored thereon a computer program for execution by a processor to perform the steps of the method of any of the above embodiments.
In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, etc.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims (18)

1. A cell reselection method, adapted to a user terminal supporting EN-DC, comprising:
When receiving new frequency selectable priority alt Cell Reselection Priority information configured by a service cell, receiving first NR frequency band information broadcasted by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by a PLMN selected by the user terminal;
When the user terminal does not support NR frequency bands in the first NR frequency band information as EN-DC frequency band combination, using original frequency priority cell Reselection Priority information to reselect a cell;
and when the user terminal does not support the reselection target LTE frequency as the EN-DC frequency band combination, performing cell reselection on the reselection target LTE frequency by using the original frequency priority information.
2. The cell reselection method of claim 1, comprising: and when the first NR frequency band information broadcast by the service cell is not received, using the original frequency priority information to reselect the cell.
3. The cell reselection method of claim 1, comprising: and when the first NR frequency band information broadcast by the service cell is not received, using the new frequency selectable priority information to reselect the cell.
4. The cell reselection method of claim 1, comprising: when the first NR frequency band information broadcast by the service cell is not received and the new frequency selectable priority information contains the LTE frequency of the EN-DC frequency band combination supported by the user terminal, performing cell reselection on the LTE frequency of the EN-DC frequency band combination supported by the user terminal contained in the new frequency selectable priority information by using the new frequency selectable priority information; and carrying out cell reselection on the LTE frequency of the EN-DC frequency band combination which is not supported by the user terminal and contained in the new frequency selectable priority information by using the original frequency priority information.
5. The cell reselection method of any one of claims 1 to 4, further comprising: and when the user terminal supports the NR frequency band in the first NR frequency band information to be used as an EN-DC frequency band combination, using the new frequency selectable priority information to reselect a cell.
6. The method of cell reselection of claim 5, further comprising, prior to cell reselection using the new frequency selectable priority information:
Judging whether the user terminal supports LTE frequency in the new frequency selectable priority information and NR frequency bands in the first NR frequency band information to be used as EN-DC frequency band combination;
and when the user terminal supports the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information are used as EN-DC frequency band combination, using the new frequency selectable priority information to reselect a cell.
7. The cell reselection method of claim 1, further comprising, prior to said receiving the first NR frequency band information broadcast by the serving cell:
Judging whether the reselection target frequency is in a preset frequency range or not;
And when the reselection target frequency is in a preset frequency range, using the new frequency selectable priority information to reselect the cell, otherwise, receiving first NR frequency band information broadcasted by the service cell, and performing cell reselection based on the first NR frequency band information.
8. The cell reselection method of claim 1, further comprising, after the receiving the new frequency selectable priority information configured by the serving cell, before the receiving the first NR frequency band information broadcast by the serving cell:
and when the user terminal supports to reside in an NR cell and the UE detects a reselection target NR cell, using the original frequency priority information to conduct cell reselection.
9. A user terminal, comprising:
The receiving unit is suitable for receiving first NR frequency band information broadcasted by a service cell when receiving new frequency selectable priority information configured by the service cell, wherein the first NR frequency band information is an NR frequency band in EN-DC supported by PLMN selected by the user terminal;
The first cell reselection unit is suitable for performing cell reselection by using the original frequency priority information when the user terminal does not support NR frequency bands in the first NR frequency band information as EN-DC frequency band combination;
And the second cell reselection unit is suitable for performing cell reselection on the reselection target LTE frequency by using the original frequency priority information when the user terminal does not support the reselection target LTE frequency as the EN-DC frequency band combination.
10. The user terminal of claim 9, further comprising: and the third cell reselection unit is suitable for carrying out cell reselection by using the original frequency priority information when the first NR frequency band information broadcast by the service cell is not received.
11. The user terminal of claim 9, further comprising: and a fourth cell reselection unit adapted to perform cell reselection using the new frequency selectable priority information when the first NR frequency band information broadcast by the serving cell is not received.
12. The user terminal of claim 9, further comprising: a fifth cell reselection unit, adapted to, when the first NR frequency band information broadcast by the serving cell is not received and the new frequency selective priority information includes an LTE frequency of an EN-DC frequency band combination supported by the user terminal, perform cell reselection on the LTE frequency of the EN-DC frequency band combination supported by the user terminal included in the new frequency selective priority information by using the new frequency selective priority information; and carrying out cell reselection on the LTE frequency of the EN-DC frequency band combination which is not supported by the user terminal and contained in the new frequency selectable priority information by using the original frequency priority information.
13. The user terminal of any of claims 9 to 12, further comprising: and a sixth cell reselection unit adapted to perform cell reselection by using the new frequency selectable priority information when the user terminal supports the NR frequency band in the first NR frequency band information as an EN-DC frequency band combination.
14. The user terminal of claim 13, further comprising:
A first judging unit, adapted to judge whether the user terminal supports LTE frequency in the new frequency selectable priority information and NR frequency band in the first NR frequency band information as EN-DC frequency band combination before cell reselection using the new frequency selectable priority information;
And a seventh cell reselection unit, adapted to use the new frequency selectable priority information to perform cell reselection when the user terminal supports the LTE frequency in the new frequency selectable priority information and the NR frequency band in the first NR frequency band information is used as an EN-DC frequency band combination.
15. The user terminal of claim 9, further comprising:
The second judging unit is suitable for judging whether the reselection target frequency is in a preset frequency range or not;
And an eighth cell reselection unit, adapted to use the new frequency selectable priority information to perform cell reselection when the reselection target frequency is within a preset frequency range, otherwise, receive first NR frequency band information broadcasted by the serving cell, and perform cell reselection based on the first NR frequency band information.
16. The user terminal of claim 9, further comprising:
And a ninth cell reselection unit adapted to perform cell reselection using the original frequency priority information when the UE supports camping on an NR cell and the UE detects a reselection target NR cell after the receiving of the new frequency selectable priority information configured by the serving cell and before the receiving of the first NR frequency band information broadcasted by the serving cell.
17. A user terminal comprising a memory and a processor, the memory having stored thereon a computer program capable of being run on the processor, the processor executing the steps of the method according to any of claims 1 to 8 when the computer program is run on the processor.
18. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program is executed by a processor to implement the steps of the method of any of claims 1 to 8.
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