CN114554556A - Cell switching method, user equipment and storage medium - Google Patents

Cell switching method, user equipment and storage medium Download PDF

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Publication number
CN114554556A
CN114554556A CN202011330887.2A CN202011330887A CN114554556A CN 114554556 A CN114554556 A CN 114554556A CN 202011330887 A CN202011330887 A CN 202011330887A CN 114554556 A CN114554556 A CN 114554556A
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cell
condition information
switching condition
switching
frequency
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徐敏
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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Priority to CN202011330887.2A priority Critical patent/CN114554556A/en
Priority to PCT/CN2021/130575 priority patent/WO2022111321A1/en
Publication of CN114554556A publication Critical patent/CN114554556A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength

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

Abstract

A cell switching method, user equipment and a storage medium are provided. The method comprises the following steps: receiving configuration information of an alternative cell and cell switching condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a same-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell; and when the AP cell meets the corresponding cell switching condition, switching to the AP cell meeting the corresponding cell switching condition. By applying the scheme, the UE can be preferentially accessed to the AP cell, and the UE can be favorably kept stable in performance.

Description

Cell switching method, user equipment and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a cell switching method, a user equipment, and a storage medium.
Background
In recent years, mobile communication has begun to replace fixed line communication, and demands for high quality voice, reliable service, and low price have been increasing. In addition to the currently existing mobile telephone networks, a new class of small base stations has emerged that can be installed in residential or commercial locations to provide indoor wireless coverage for mobile units using existing broadband internet connections. Such personal femto base stations are commonly referred to as wireless Access Point (AP) base stations. The AP base station can be used in a plug-and-play mode, and the transmission and network planning cost can be reduced.
The cell covered by the AP base station is called AP cell. The cell covered by the macro base station is called a macro cell. In practical applications, User Equipment (UE) in an AP cell may be connected to a core network through an AP base station. UEs within the macro cell may also connect to the core network through the macro cell base station.
A standard for developing a study on the fifth generation (5th generation, 5G) by the third generation partnership project (3rd generation partnership project, 3GPP) has been released, a Conditional Handover (CHO) is introduced into 5GRel-16, and a User Equipment (UE) autonomously determines a target cell to be handed over when a configured cell handover condition is satisfied.
However, the above method for cell handover is not favorable for UE to maintain stable performance.
Disclosure of Invention
The invention aims to solve the problems that: how to help the UE keep the performance stable.
In order to solve the above problem, an embodiment of the present invention provides a cell handover method, where the method includes:
receiving configuration information of an alternative cell and cell switching condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell;
and when the AP cell meets the corresponding cell switching condition, switching to the AP cell meeting the corresponding cell switching condition.
Optionally, the cell handover condition information includes: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell.
Optionally, when the cell switching condition information includes first cell switching condition information and the number of the AP cells is two or more, the first cell switching condition information corresponds to the AP cells one to one;
the first cell switching condition information corresponding to each AP cell includes: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell.
Optionally, the first cell switching condition information corresponding to the co-frequency AP cell includes: the quality of the target cell is better than the sum of the quality of the current cell and the first offset value;
the second cell handover condition information includes: the quality of the target cell is better than the sum of the quality of the current cell and the second offset value;
the first offset value is less than the second offset value.
Optionally, the first cell switching condition information corresponding to the co-frequency AP cell includes: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold;
the second cell handover condition information includes: the quality of the current cell is lower than a third preset quality threshold, and the quality of the target cell is greater than a fourth preset quality threshold;
wherein the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the third preset quality threshold; or, the second preset quality threshold is smaller than a fourth preset quality threshold.
Optionally, the first cell switching condition information corresponding to the co-frequency AP cell includes: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold; or the target cell quality is better than the sum of the current cell quality and the first offset value;
the second cell handover condition information includes: the quality of the current cell is lower than a first preset quality threshold, the quality of the target cell is greater than a second preset quality threshold, and the quality of the target cell is superior to the sum of the quality of the current cell and a first offset value.
Optionally, the measurement offset of the target cell in the first cell handover condition information is greater than the measurement offset of the target cell in the second cell handover condition information.
Optionally, the first cell switching condition information further includes: the same-frequency AP cell meets the duration information of the corresponding cell switching condition;
the second cell switching condition information further includes: the macro cell satisfies duration information of a corresponding cell switching condition;
the duration of the same-frequency AP cell meeting the switching condition of the corresponding cell is shorter than the duration of the macro cell meeting the switching condition of the corresponding cell.
Optionally, the AP cell is an inter-frequency AP cell.
Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: and when the quality of the target cell is superior to a preset quality threshold, switching to the different-frequency AP cell.
Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: and when the target cell is the cell with the best quality in the cells corresponding to the frequency point, switching to the different-frequency AP cell.
Optionally, the first cell handover condition information corresponding to the inter-frequency AP cell includes: and after the third deviation value is added to the quality of the target cell, switching to the different-frequency AP cell when the cell with the best quality in the cell corresponding to the frequency point is the cell with the best quality.
Optionally, when the cell handover condition information only includes the first cell handover condition information or the second cell handover condition information, before performing cell handover, the method further includes:
and determining the switching condition information of another cell except the cell corresponding to the cell switching condition information based on the cell switching condition information.
An embodiment of the present invention further provides a user equipment, where the user equipment includes:
a receiving unit, adapted to receive configuration information of an alternative cell and cell switching condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell;
and the cell switching unit is suitable for switching to the AP cell meeting the corresponding cell switching condition when the AP cell meets the corresponding cell switching condition.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of any one of the methods described above.
The embodiment of the present invention further provides a user equipment, which includes a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes any of the steps of the method when running the computer program.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
by applying the scheme of the invention, when the alternative cell comprises the AP cell, if the AP cell meets the corresponding switching condition, the AP cell is preferentially switched to the AP cell, so that the UE can be connected to the core network through the AP base station. Since the AP base station is usually disposed indoors, the performance of the UE can be more stable by connecting the AP base station to the core network.
Drawings
FIG. 1 is a schematic signaling diagram of cell handover;
fig. 2 is a flowchart of a cell switching method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a user equipment in an embodiment of the present invention.
Detailed Description
The condition switching is introduced in the 5 grip-16, which is mainly to prevent the source base station from being unable to issue the switching command to the UE in time due to the UE signal change being too violent. The source base station is a base station corresponding to a cell to which the UE is currently accessing.
Fig. 1 is a schematic signaling interaction diagram of a conventional cell conditional handover. Referring to fig. 1, the specific signaling interaction process is as follows:
step 101, the UE sends a measurement report to a Source gNB.
Step 102, the Source base station Source gNB judges whether the UE needs to perform cell condition switching.
When it is determined that the UE needs to perform cell handover, step 103 is performed.
Step 103, the Source base station Source gNB sends a handover request to the Target base station Target gNB.
Step 104, the Target base station Target gbb determines whether the UE can be allowed to access.
When the Target base station Target gbb determines that the UE can be allowed to access, step 105 is performed.
Step 105, the Target gNB sends an access permission notification to the Source base station Source gNB to inform the Source base station Source gNB that the UE is allowed to access.
And step 106, the Source base station Source gNB sends an RRC reconfiguration message to the UE.
And configuring one or more pieces of candidate cell information and corresponding cell switching condition information for the UE through the RRC reconfiguration message. The UE modifies its Radio Resource Control (RRC) configuration based on the RRC reconfiguration message.
Step 107, the UE sends an RRC connection reconfiguration complete message to the Source base station Source gNB.
And step 108, judging whether the target cell meets the cell switching condition information.
When the target cell satisfies the cell switching condition information, step 109 is executed.
Step 109, handover to the target cell.
I.e. to initiate random access in the target cell.
Step 110, sending a condition switching completion message to the Target base station Target gNB.
The method comprises the steps of sending a condition switching completion message to a Target base station Target gNB and informing a Source base station Source gNB, so that the Source base station Source gNB and the Target base station Target gNB can know that the UE has completed a cell switching process.
It should be noted that in an implementation, there may be only one Target gbb or multiple Target gbbs. When the UE is judged to be required to perform cell condition switching, the Source base station Source gNB needs to send a switching request to each Target base station Target gNB. Each Target base station Target gNB judges whether the Target base station Target gNB allows the UE to access, and when the Target base station Target gNB can allow the UE to access, the Target base station Target gNB sends an access permission notice to the Source base station Source gNB. Accordingly, in step 19, the UE selects one of the target cells to autonomously select for handover.
According to the scheme, when the target cell comprises both the macro cell and the AP cell, the UE may select the macro cell for access or the AP cell for access, rather than necessarily selecting the AP cell for access. Since the AP base station is usually located indoors and is closer to the UE, the UE accessing the AP cell will obviously have more stable performance compared to the UE accessing the macro cell.
Accordingly, the embodiment of the present invention provides a cell switching method, which enables a UE to be preferentially switched to an AP cell when the AP cell exists in an alternative cell, and further enables the UE to be connected to a core network through an AP base station, so that the performance of the UE is more stable.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 2, an embodiment of the present invention provides a cell handover method, where the method may include the following steps:
step 21, receiving configuration information of the candidate cell and cell switching condition information.
Wherein the candidate cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: and second cell switching condition information corresponding to the macro cell.
And step 22, when the AP cell meets the corresponding cell switching condition, switching to the AP cell meeting the corresponding cell switching condition.
Steps 21 and 22 are described in detail below:
in specific implementation, the source base station may acquire the candidate cell that can be configured for the UE based on a measurement report sent by the UE or an AP cell proximity indication message sent by the UE, or through information interaction with the target base station. The alternative cell includes not only the macro cell but also the AP cell. For any alternative cell, the UE can access. When the UE is allowed to access the configured AP cell, the UE is called a subscriber of the AP cell, that is, the UE allowed to access by the AP cell. The AP cell may also be referred to as a small cell (small cell) or a Non-public network cell (NPN cell).
The AP base station and the macro cell base station form a heterogeneous network, the transmission power of the AP base station may be smaller than that of the existing macro cell base station, so that the coverage area of the AP base station is limited, and the AP base station may be deployed at the same frequency or different frequencies as the macro cell base station. And when the main carrier frequency of the AP cell is the same as the current working carrier frequency of the UE, the AP cell is called the co-frequency AP cell of the UE. When the main carrier frequency of the AP cell is different from the current working carrier frequency of the UE, the AP cell is called a pilot frequency AP cell of the UE. The quality of a certain cell is determined by the measurement result of the cell and the measurement offset configured on the network side.
In an implementation, the source base station may perform event-related evaluation on the Signal Quality based on a Reference Signal Received Quality (RSRQ), a Signal to Interference plus Noise Ratio (SINR), and a Reference Signal Received Power (RSRP), and configure a corresponding cell handover condition for the UE.
And when the AP cell meets the corresponding cell switching condition, the UE is switched to the AP cell regardless of whether the macro cell in the candidate cell meets the corresponding cell switching condition or not, and the macro cell is not considered. The AP cell satisfying the cell switching condition may be an intra-frequency AP cell or an inter-frequency AP cell. And as long as the AP cell meets the corresponding cell switching condition, the UE is switched to the AP cell. If the same-frequency AP cell and the different-frequency AP cell simultaneously meet the corresponding cell switching conditions, the AP cell with the best quality can be selected for switching.
The cell switching condition information in the embodiment of the present invention includes not only the switching condition itself, but also information such as a measurement offset and an offset value that are required to be used by the switching condition. The condition for triggering the UE to perform cell handover may be an A3 event or an a5 event.
In a specific implementation, the a3 event is that the quality of the target cell is at least higher than the quality of the current cell SpCell by a preset offset value Off, that is:
Mn+Ofn+Ocn–Hys>Mp+Ofp+Ocp+Off (1)
mn is the measurement result of the target cell, and Ofn and Ocn are the measurement offset of the target cell configured by the source base station. Mp is the measurement result of the current cell Spcell, and Ofp and Ocp are the measurement offsets of the current cell Spcell. The current cell SpCell includes: primary cell (Pcell) and primary and secondary cell (PScell). Hys is a fixed value configured for the source base station. The measurement offsets Ofn and Ocn of the target cell, the measurement offsets Ofp and Ocp, Hys, and the preset offset Off of the current cell Spcell, and the handover condition itself constitute handover condition information.
For convenience of description, in the embodiment of the present invention, two A3 events having the same measurement offsets Ofp and Ocp and the same preset offset Off of the current cell Spcell are referred to as the same A3 event. Two A3 events with different measurement offsets Ofp and Ocp and preset offset Off of the current cell Spcell are called different A3 events.
The condition for cell handover is the a3 event, which indicates that when the target cell quality satisfies equation (1), the UE is triggered to handover to the target cell.
The A5 event is: the quality of the current cell SpCell is below the threshold Thresh1 and the target cell quality is above the threshold Thresh2, i.e.:
Mp+Hys<Thresh1 (2)
Mn+Ofn+Ocn–Hys>Thresh2 (3)
ofn and Ocn, Hys and thresholds Thresh1 and Thresh2, and the switching condition itself constitute switching condition information. The condition for cell handover is an a5 event, which indicates that when the target cell quality satisfies formula (2) and formula (3), the UE is triggered to handover to the target cell.
In the embodiment of the present invention, for convenience of description, two a5 events having the same threshold Thresh1 and threshold Thresh2 are referred to as the same a5 event. Two a5 events with different arbitrary values in the threshold Thresh1 and the threshold Thresh2 are referred to as different a5 events.
In an embodiment of the present invention, the first cell handover condition information corresponding to the AP cell is the same as the second cell handover condition information corresponding to the macro cell, that is, the AP cell and the macro cell satisfy the same handover condition and the related information for the handover condition is the same, and then the UE is allowed to perform handover. For example, when the cell handover conditions are all configured to the same a3 event, as shown in formula (1), the AP cell and the macro cell are the same for the measurement offsets Ofp, the Ocp, the Hys, and the preset offset Off of the current cell Spcell.
At this time, no matter in the same-frequency AP cell or the inter-frequency AP cell, the cell switching condition information may include: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell. And the UE can preferentially switch to the AP cell when the cell meeting the cell switching condition simultaneously comprises the macro cell and the AP cell based on the indication of the first priority switching cell indication information. And when a plurality of AP cells meet the conditions, selecting the AP cell with the best quality for switching.
In another embodiment, when the cell switching condition information includes first cell switching condition information and the number of the AP cells is two or more, the first cell switching condition information corresponds to the AP cells one to one. In this case, the first cell switching condition information corresponding to each AP cell may include: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell.
By adding the first priority switching cell indication information in the first cell switching condition information corresponding to each AP cell, when the AP cell meets the cell switching condition, the AP cell meeting the cell switching condition can be switched to preferentially.
In specific implementation, the corresponding first cell switching condition information may also be set for the co-frequency AP cell and the inter-frequency AP cell, respectively. The following are separately described:
for the same-frequency AP cell, because the main carrier frequency is the same as the current working carrier frequency of the UE, interference may be caused to the UE, and therefore, when performing cell handover, in order to avoid the same-frequency interference as much as possible, it is necessary to set a cell handover condition with respect to the quality of the macro cell in the alternative cell, so that the UE can more easily access the same-frequency AP cell in the alternative cell with respect to the macro cell in the alternative cell.
In an embodiment of the present invention, an intra-frequency AP cell and a macro cell may be configured to perform cell handover when different a3 events are satisfied. Specifically, the first cell switching condition information corresponding to the co-frequency AP cell may include: the target cell quality is better than the current cell quality plus the first offset value. Correspondingly, the second cell handover condition information includes: the target cell quality is better than the current cell quality plus the second offset value. Wherein the first offset value is less than the second offset value.
That is to say, if the quality of the target co-frequency AP cell is better than the sum of the quality of the current cell and the first offset value, the target co-frequency AP cell meets the handover condition, and the UE may handover from the current cell to the target co-frequency AP cell. And if the quality of the target macro cell is better than the sum of the quality of the current cell and the second offset value, the target macro cell meets the switching condition, and the UE can be switched to the target macro cell from the current cell. By setting the first offset value to be smaller than the second offset value, the target same-frequency AP cell can meet the switching condition more easily, and the UE can be switched to the target same-frequency AP cell more easily.
For example, as shown in formula (1), the first offset off1 can be configured to be smaller than the second offset off2, and at this time, the target intra-frequency AP cell more easily satisfies formula (1) under the condition that the measurement offsets Ofp and Ocp of the current cell Spcell are the same.
In another embodiment of the present invention, the co-frequency AP cell and the macro cell may be configured to perform cell handover when different a5 events are satisfied. Specifically, the first cell switching condition information corresponding to the co-frequency AP cell includes: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold. The second cell handover condition information includes: the quality of the current cell is lower than a third preset quality threshold, and the quality of the target cell is greater than a fourth preset quality threshold.
Wherein the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the third preset quality threshold; or, the second preset quality threshold is smaller than a fourth preset quality threshold.
That is, if the quality of the current cell is lower than a first preset quality threshold and the quality of the target co-frequency AP cell is greater than a second preset quality threshold, the target co-frequency AP cell satisfies the handover condition, and the UE can be handed over from the current cell to the target co-frequency AP cell. If the quality of the current cell is lower than a third preset quality threshold and the quality of the target macro cell is higher than a fourth preset quality threshold, the target macro cell meets the switching condition, and the UE can be switched to the target macro cell from the current cell.
As can be seen from formula (2), the larger the threshold Thresh1 is, the easier the quality of the current cell meets formula (2), so by setting the first preset quality threshold to be greater than the third preset quality threshold, the easier the target co-frequency AP cell meets the a5 event.
Similarly, as can be seen from the formula (3), the smaller the threshold Thresh2 is, the easier the quality of the target cell meets the formula (3), so by setting the second preset quality threshold to be greater than the fourth preset quality threshold, the easier the target co-frequency AP cell meets the a5 event.
It should be noted that, in a specific implementation, only the first preset quality threshold may be set to be greater than the third preset quality threshold, and at this time, the second preset quality threshold may be equal to a fourth preset quality threshold. Or only setting the second preset quality threshold to be smaller than a fourth preset quality threshold, where the first preset quality threshold may be equal to the third preset quality threshold. The second preset quality threshold may also be set to be smaller than a fourth preset quality threshold. Or simultaneously setting that the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold, at this time, the target co-frequency AP cell most easily meets the a5 event.
In another embodiment of the present invention, the co-frequency AP cells may be configured to perform cell handover when meeting an A3 event or an a5 event, and the macro cells may be configured to perform cell handover when meeting the same A3 event and the same a5 event, thereby increasing the difficulty of UE handover to the macro cell, and making it easier for the UE to handover to the target co-frequency AP cell.
Specifically, the first cell switching condition information corresponding to the co-frequency AP cell includes: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold; alternatively, the target cell quality is better than the current cell quality plus the first offset value. The second cell handover condition information includes: the quality of the current cell is lower than a first preset quality threshold, the quality of the target cell is greater than a second preset quality threshold, and the quality of the target cell is superior to the sum of the quality of the current cell and a first offset value.
That is, when the cell switching condition of the target co-frequency AP cell is the A3 event, the macro cell needs to satisfy the a5 event in addition to the same A3 event. When the cell switching condition of the target co-frequency AP cell is an a5 event, the macro cell needs to satisfy an A3 event in addition to the same a5 event.
It is understood that, in an implementation, when the cell handover condition of the target intra-frequency AP cell is an A3 event, the macro cell may perform the cell handover condition only when the a5 event and another different A3 event are satisfied. When the cell switching condition of the target co-frequency AP cell is an a5 event, the macro cell may perform the cell switching condition only when the A3 event and another different a5 event are satisfied. How to set specifically is not limited as long as the UE can be easily switched to the target co-frequency AP cell.
In another embodiment of the present invention, the measurement offset of the target cell in the first cell handover condition information may be configured to be greater than the measurement offset of the target cell in the second cell handover condition information.
In a specific implementation, the measurement offset of the target cell in the first cell handover condition information refers to Ofn and Ocn of the target co-frequency AP cell configured by the source base station. The measurement offset of the target cell in the second cell handover condition information refers to Ofn and Ocn of the target macro cell configured by the source base station. By increasing the measurement offset of the target cell in the first cell switching condition information, the target co-frequency AP cell can meet the formula (1) or (3) more easily. Therefore, the UE can more easily access the target same-frequency AP cell no matter the A3 event is adopted as the cell switching condition or the A5 event is adopted as the cell switching condition.
In specific implementation, besides setting parameters of related events in the cell switching condition information, the UE is easier to switch to the AP common-frequency cell, and the duration that the target cell meets the corresponding cell switching condition can be set at the same time.
Specifically, the first cell switching condition information may further include: the same-frequency AP cell meets the duration information of the corresponding cell switching condition; the second cell switching condition information further includes: the macro cell satisfies duration information of a corresponding cell handover condition. The duration of the same-frequency AP cell meeting the switching condition of the corresponding cell is shorter than the duration of the macro cell meeting the switching condition of the corresponding cell.
For example, when the cell switching condition satisfied by the intra-frequency AP cell in the first cell switching condition information is an A3 event, the duration that the intra-frequency AP cell satisfies the A3 event may be configured to be t 1. In the second cell handover condition information, the cell handover condition satisfied by the macro cell is also an A3 event, but the duration of the macro cell satisfying the A3 event is configured to be t2, and t1 < t 2. By shortening the duration required by the same-frequency AP cell to meet the switching condition, the UE can be switched to the same-frequency AP cell more quickly.
In one embodiment, t1 may be set to 0, and then the intra-frequency AP cell is handed over to once it satisfies the A3 event.
In an embodiment, the alternative cell may include only the inter-frequency AP cell and not the macro cell. Alternatively, the alternative cell may include both the inter-frequency AP cell and the macro cell.
For the pilot frequency AP cell, because the co-frequency interference does not exist, whether to switch or not can be determined based on the quality of the target cell, and the quality of the macro cell and the quality of the current cell do not need to be considered.
In an embodiment of the present invention, the first cell switching condition information corresponding to the inter-frequency AP cell includes: and when the quality of the target cell is superior to a preset quality threshold, switching to the different-frequency AP cell. At this time, regardless of the quality of the macro cell, the handover can be performed as long as the inter-frequency AP cell satisfies the above condition. The preset quality threshold can be set according to actual conditions.
In another embodiment of the present invention, the first cell switching condition information corresponding to the inter-frequency AP cell may include: and when the target cell is the cell with the best quality in the cells corresponding to the frequency point, switching to the different-frequency AP cell.
When the target pilot frequency AP cell is the cell with the best quality in the cells corresponding to the frequency points, the quality of the cell is good enough, and the network reliability is higher, so that the switching can be performed as long as the pilot frequency AP cell meets the conditions no matter the quality of the macro cell.
In another embodiment of the present invention, the first cell switching condition information corresponding to the inter-frequency AP cell may include: and after the third deviation value is added to the quality of the target cell, switching to the different-frequency AP cell when the cell with the best quality in the cell corresponding to the frequency point is the cell with the best quality. The third offset value may be set according to actual conditions.
That is, the quality of the target inter-frequency AP cell is the best quality cell in the cells corresponding to the frequency point after the third offset value is added, and at this time, the network reliability is higher, and the UE can be controlled to perform cell switching.
In a specific implementation, the cell switching condition information may include both the first cell switching condition information and the second cell switching condition information.
In order to save transmission resources, the cell switching condition information may also include only the first cell switching condition information and not the second cell switching condition information, or only the second cell switching condition information and not the first cell switching condition information.
In an embodiment of the present invention, when the cell handover condition information only includes the first cell handover condition information or the second cell handover condition information, before performing cell handover, handover condition information of another cell except the cell corresponding to the cell handover condition information may be determined based on the cell handover condition information.
Specifically, when only the first cell handover condition information is included in the cell handover condition information, before cell handover is performed, the second cell handover condition information may be determined based on the first cell handover condition information. When the cell switching condition information only includes the second cell switching condition information, the first cell switching condition information may be determined based on the second cell switching condition information before cell switching is performed.
Specifically, how to determine the handover condition information of another cell except the cell corresponding to the cell handover condition information according to the cell handover condition information may be implemented by a protocol or a pre-agreed manner.
When the macro cell and the AP cell both trigger cell handover when the event a3 is satisfied, the relationship between the first offset value in the first cell handover condition information and the second offset value in the second cell handover condition information may be agreed in advance, and based on the relationship between the two offset values, the other cell handover condition information is determined.
For example, when the cell switching condition information only includes the second cell switching condition information, a result obtained by subtracting the second offset value in the second cell switching condition information from the fixed value a is predetermined to be the first offset value in the first cell switching condition information.
When the macro cell and the AP cell both trigger cell handover when the event a5 is satisfied, the relationship between the first preset quality threshold in the first cell handover condition information and the third preset quality threshold in the second cell handover condition information, the relationship between the second preset quality threshold in the first cell handover condition information and the fourth preset quality threshold in the second cell handover condition information, and the relationship between the threshold values in the two cell handover condition information may be predetermined, and the other cell handover condition information may be determined based on the relationship between the threshold values in the two cell handover condition information.
For example, when the cell switching condition information only includes the first cell switching condition information, a result obtained by subtracting a first preset quality threshold in the first cell switching condition information from a fixed value b is predetermined to be a third preset quality threshold in the second cell switching condition information. Meanwhile, the result obtained by subtracting the second preset quality threshold from the fixed value b in the first cell switching condition information may be defined as the fourth preset quality threshold in the first cell switching condition information.
In a specific implementation, when the number of AP cells satisfying the corresponding cell switching condition is more than two, the UE may select a target AP cell with the best quality to switch according to the quality of each target AP cell.
In specific implementation, the handover is performed in the target cell, that is, the source base station is notified to release the RRC connection of the UE, and the UE initiates random access in the target cell to establish the RRC connection with the target base station.
In specific implementation, the UE may find the co-frequency cell that generates co-frequency interference to itself currently, and if the co-frequency cell allows the UE to access, the UE may access the co-frequency cell by using the cell switching method in the above embodiment, so as to avoid the co-frequency interference.
And when the same-frequency cell does not allow the UE to access, the UE is a non-subscriber relative to the same-frequency cell. In order to avoid co-channel interference, interference coordination or handover between the AP base station and the macro cell base station is required. The current common practice is: through interference coordination between base stations, the transmitting power of the AP base station is adjusted, or pilot frequency switching or redirection is carried out on the UE, so that co-frequency interference is avoided, and call drop caused by interference is avoided.
Different from the prior art, in the embodiment of the invention, after discovering the co-frequency cell which generates co-frequency interference to the UE at present, the UE can report the co-frequency cell which generates the co-frequency interference to the UE to the source base station.
In an embodiment of the present invention, the source base station may configure one or more inter-frequency cells as candidate cells to the UE, and when configuring corresponding handover conditions, may configure RSRQ or SINR as a measurement quantity in the handover conditions to the UE. Namely, when the RSRQ or SINR of the pilot frequency cell reaches a preset value, the UE switches from the current cell to the corresponding pilot frequency cell.
In another embodiment of the present invention, an I1 event may be introduced as a handover condition for evaluation, where the I1 event refers to interference being greater than a certain threshold, as shown in formula (4):
Mi–Hys>Thresh (4)
where Mi is an interference measurement result of the macro cell, here, the interference measurement result of the macro cell, and if the event is satisfied, the best pilot frequency candidate cell that satisfies the condition is selected for handover.
In another embodiment of the present invention, the handover conditions of the inter-frequency cell may be configured as follows: and the interference AP cell meets at least one of the A3 event, the A5 event, exceeds a certain threshold and is greater than the signal quality of the macro cell, and the best pilot frequency alternative cell meeting the conditions is selected for switching.
As can be seen from the above, the cell switching method in the embodiment of the present invention, by setting the cell switching condition, can enable the UE to preferentially select the AP cell for switching when a certain condition is met, thereby effectively improving the performance stability of the UE.
In order to make the present invention better understood and implemented by those skilled in the art, the following detailed description is provided for a user equipment and a computer readable storage medium corresponding to the above method.
Referring to fig. 3, an embodiment of the present invention provides a user equipment 30, where the user equipment 30 may include: a receiving unit 31 and a cell switching unit 32. Wherein:
the receiving unit 31 is adapted to receive configuration information of an alternative cell and cell handover condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only an AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell;
the cell switching unit 32 is adapted to switch to the AP cell meeting the corresponding cell switching condition when the AP cell meets the corresponding cell switching condition.
The receiving unit 31 and the cell switching unit 32 may be implemented specifically with reference to the description of steps 21 and 22, and are not described herein again.
The embodiment of the present invention further provides another computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement any step of the cell handover method in the foregoing embodiments, which is not described in detail herein.
In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The embodiment of the present invention further provides a user equipment, where the user equipment includes a memory and a processor, the memory stores a computer program capable of running on the processor, and the processor executes any of the steps of the method when running the computer program.
The technical scheme of the invention can be applied to 5G (5Generation) communication systems, 4G and 3G communication systems, and various future new communication systems such as 6G and 7G.
A Base Station (BS) in the embodiment of the present application, which may also be referred to as a Base Station device, is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, the device providing the Base Station function in the 2G network includes a Base Transceiver Station (BTS), the device providing the Base Station function in the 3G network includes a node B (NodeB), the device providing the Base Station function in the 4G network includes an evolved node B (eNB), and in a Wireless Local Area Network (WLAN), the device providing the Base Station function is a device gNB providing the Base Station function in the AP, the 5G NR, and a node B (ng-eNB) continuing to evolve. The gNB and the terminal communicate with each other by adopting an NR (NR) technology, the ng-eNB and the terminal communicate with each other by adopting an E-UTRA (evolved Universal Terrestrial Radio Access) technology, and both the gNB and the ng-eNB can be connected to a 5G core network. The base station in the embodiment of the present application also includes a device and the like that provide a function of the base station in a future new communication system.
The user equipment in the embodiment of the present application includes various forms, and may be an access terminal, a subscriber unit, a subscriber station, a mobile station (mobile station, MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The Wireless communication device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with a Wireless communication function, a computing device or other processing devices connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment of the present application.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (16)

1. A method of cell handover, comprising:
receiving configuration information of an alternative cell and cell switching condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell;
and when the AP cell meets the corresponding cell switching condition, switching to the AP cell meeting the corresponding cell switching condition.
2. The cell switching method of claim 1, wherein the cell switching condition information includes: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell.
3. The cell switching method according to claim 1, wherein when the cell switching condition information includes first cell switching condition information and the number of the AP cells is two or more, the first cell switching condition information corresponds to the AP cells one to one;
the first cell switching condition information corresponding to each AP cell includes: and the first priority switching cell indication information is used for indicating that the AP cell is switched to preferentially when the cell meeting the corresponding cell switching condition simultaneously comprises the macro cell and the AP cell.
4. The cell switching method of claim 1,
the first cell switching condition information corresponding to the co-frequency AP cell comprises: the quality of the target cell is better than the sum of the quality of the current cell and the first offset value;
the second cell handover condition information includes: the quality of the target cell is better than the sum of the quality of the current cell and the second offset value;
the first offset value is less than the second offset value.
5. The cell switching method of claim 1,
the first cell switching condition information corresponding to the co-frequency AP cell comprises: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold;
the second cell handover condition information includes: the quality of the current cell is lower than a third preset quality threshold, and the quality of the target cell is greater than a fourth preset quality threshold;
wherein the first preset quality threshold is greater than the third preset quality threshold, and the second preset quality threshold is less than the fourth preset quality threshold; or, the first preset quality threshold is greater than the third preset quality threshold; or, the second preset quality threshold is smaller than a fourth preset quality threshold.
6. The cell switching method of claim 1,
the first cell switching condition information corresponding to the co-frequency AP cell comprises: the quality of the current cell is lower than a first preset quality threshold, and the quality of the target cell is greater than a second preset quality threshold; or the target cell quality is better than the sum of the current cell quality and the first offset value;
the second cell handover condition information includes: the quality of the current cell is lower than a first preset quality threshold, the quality of the target cell is greater than a second preset quality threshold, and the quality of the target cell is superior to the sum of the quality of the current cell and a first offset value.
7. The cell switching method of claim 1, wherein the measurement offset of the target cell in the first cell switching condition information is greater than the measurement offset of the target cell in the second cell switching condition information.
8. The cell switching method according to any one of claims 4 to 7,
the first cell switching condition information further includes: the same-frequency AP cell meets the duration information of the corresponding cell switching condition;
the second cell switching condition information further includes: the macro cell satisfies duration information of a corresponding cell switching condition;
the duration of the same-frequency AP cell meeting the switching condition of the corresponding cell is shorter than the duration of the macro cell meeting the switching condition of the corresponding cell.
9. The cell switching method of claim 1, wherein the AP cell is an inter-frequency AP cell.
10. The cell switching method according to claim 9, wherein the first cell switching condition information corresponding to the inter-frequency AP cell includes: and when the quality of the target cell is superior to a preset quality threshold, switching to the different-frequency AP cell.
11. The cell switching method according to claim 9, wherein the first cell switching condition information corresponding to the inter-frequency AP cell includes: and when the target cell is the cell with the best quality in the cells corresponding to the frequency point, switching to the different-frequency AP cell.
12. The cell switching method according to claim 4, wherein the first cell switching condition information corresponding to the inter-frequency AP cell comprises: and after the third deviation value is added to the quality of the target cell, switching to the different-frequency AP cell when the cell with the best quality in the cell corresponding to the frequency point is the cell with the best quality.
13. The cell handover method of claim 1, wherein when the cell handover condition information includes only the first cell handover condition information or the second cell handover condition information, prior to performing cell handover, the method further comprises:
and determining the switching condition information of another cell except the cell corresponding to the cell switching condition information based on the cell switching condition information.
14. A user device, comprising:
a receiving unit, adapted to receive configuration information of an alternative cell and cell switching condition information; the alternative cell at least comprises: an AP cell; when the AP cell is a co-frequency AP cell, the alternative cell further comprises a macro cell; when the candidate cell includes only the AP cell, the cell switching condition information includes: first cell switching condition information corresponding to the AP cell; when the candidate cell includes a macro cell, the cell switching condition information further includes: second cell switching condition information corresponding to the macro cell;
and the cell switching unit is suitable for switching to the AP cell meeting the corresponding cell switching condition when the AP cell meets the corresponding cell switching condition.
15. A computer-readable storage medium, on which a computer program is stored, which computer program is executable by a processor for carrying out the steps of the method according to any one of claims 1 to 13.
16. A user equipment comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the method of any of claims 1 to 13.
CN202011330887.2A 2020-11-24 2020-11-24 Cell switching method, user equipment and storage medium Pending CN114554556A (en)

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