CN112118608B - A method, device and base station for a terminal to switch cells - Google Patents

Abstract

The invention discloses a method, device and base station for a terminal to switch cells. In the method provided by the invention, after the source base station sends a switching command to the eMTC terminal, the source base station randomly accesses and responds to the narrowband where the RAR is located in the target base station for a period of time without scheduling To reduce the interference of the source base station to the handover cell of the eMTC terminal and improve the access success rate, thus effectively solving the problem of reducing the handover success rate of the eMTC terminal due to the interference of the source cell in the prior art.

Description

A method, device and base station for a terminal to switch cells

technical field

The present invention relates to the communication field, in particular to a method, a device and a base station for a terminal to switch cells.

Background technique

3GPP (3rd Generation Partnership Project) defined an enhanced Machine Type Communication (eMTC) protocol in Release 13 to support the large-connected WAN Internet of Things.

The handover process of the eMTC terminal between cells is shown in Figure 1. According to Figure 1, in the prior art, after receiving the handover request confirmation from the target base station, the source base station directly sends a handover command to the eMTC terminal, and then the eMTC The terminal initiates random access to the target base station, and this access method will affect the success rate of handover of the eMTC terminal.

Contents of the invention

The invention provides a method, a device and a base station for a terminal to switch cells, which are used to solve the problem in the prior art that the switching success rate is low when a terminal switches cells.

In order to solve the above-mentioned technical problems, in the first aspect, the present invention provides a method for a terminal to switch cells, which is applied to a source base station. The method includes: after receiving a switch request response sent by a target base station, sending switch command, and close the scheduling service on the narrowband where the preset random access response RAR of the source base station is located, and restart the scheduling service on the narrowband where the preset RAR is located after a predetermined time; wherein, the narrowband where the preset RAR is located is the narrowband where the target base station and the terminal RAR are located.

In a second aspect, the present invention provides a device for a terminal to switch cells, which is applied to a source base station. The device includes: a receiving unit, configured to receive a handover request response sent by a target base station; After receiving the handover request response sent by the target base station, send a handover command to the terminal in the handover cell, and close the scheduling service on the narrowband where the source base station preset random access response RAR is located, and restart after a predetermined time Scheduling services on the narrowband where the preset RAR is located; wherein, the narrowband where the preset RAR is located is the narrowband where the target base station and the RAR of the C terminal are located.

In a third aspect, the present invention provides a computer-readable storage medium, wherein a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, any one of the above terminal cell switching steps of the method.

In a fourth aspect, the present invention provides a base station, where the base station includes: a memory, a processor, and a computer program stored in the memory and operable on the processor, the computer program being executed by the processor When executed, the steps of any one of the described methods are realized.

In the method provided by the present invention, after the source base station sends a handover command to the terminal, the source base station does not schedule services in the narrowband where the random access response (Random Access Response, RAR) of the target base station is located for a period of time, so as to reduce the interference of the source base station on the handover cell of the terminal , improving the access success rate, thereby effectively solving the problem in the prior art that the terminal handover success rate is reduced due to the interference of the source cell.

Description of drawings

FIG. 1 is a schematic flowchart of a method for a terminal to switch cells in the prior art;

FIG. 2 is a schematic flowchart of a method for a terminal switching cells according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of narrowband division in an embodiment of the present invention;

FIG. 4 is a schematic flowchart of another method for a terminal to switch cells according to an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an apparatus for a terminal switching cells according to an embodiment of the present invention.

detailed description

In order to solve the problem in the prior art that the terminal handover success rate is low due to the interference of the source cell, the present invention provides a method, device and base station for a terminal handover cell. The present invention is further described below in conjunction with the drawings and embodiments Detailed description. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The first embodiment of the present invention provides a method for a terminal to switch cells. The flow of the method is shown in FIG. 2, including steps S201 to S203:

S201. Receive a handover request response sent by a target base station;

Before this step, the source base station first judges whether the handover condition is met, and if the handover condition is met, then sends a handover request to the target base station, and then the target base station returns a handover request response to the source base station.

It should be noted that the handover request response returned by the target base station to the source base station in the embodiment of the present invention includes at least the narrowband position of the RAR when the terminal accesses the target base station, that is, the handover request response returned by the target base station to the source base station must carry the target The base station accesses the narrowband location of the RAR used by the terminal, for the terminal to access the target base station.

S202. Send a handover command to the terminal in the handover cell, and close the scheduling service on the narrowband where the preset random access response RAR of the source base station is located;

The handover command sent by the source base station to the terminal includes the basic information of the terminal's access to the target cell, such as the target cell ID, the narrowband location of the RAR when the terminal accesses the target base station, and so on.

Wherein, in the embodiment of the present invention, the preset narrowband where the RAR is located is the narrowband where the target base station and the terminal RAR are located.

S203. After a predetermined time, restart the scheduling service on the narrowband where the preset RAR is located.

In specific implementation, the predetermined time in the embodiment of the present invention is less than the preset cell switching time. The preset cell switching time is the preset value of the time used by the terminal to switch cells. When this time value is reached, the terminal will be triggered Initiate connection requests to all handover cells to ensure that the terminal can access the cells.

That is to say, in the embodiment of the present invention, after the source base station sends the handover command to the terminal, within a period of time, the source base station randomly accesses the narrowband non-scheduling service where the target base station responds, so as to reduce the interference of the source base station on the terminal handover cell, thereby The success rate of terminal access is improved, thereby effectively solving the problem of reducing the success rate of terminal handover due to the interference of the source cell in the prior art.

It should be noted that the method described in the embodiment of the present invention can be applied to an enhanced machine type communication (enhancedMachine Type Communication, eMTC) terminal, of course, those skilled in the art can also apply the method described in the embodiment of the present invention according to actual needs 5G, 6G and other terminal cell handover.

The following will mainly take the eMTC terminal as an example to describe the method described in the embodiment of the present invention in detail:

其中

表示整个系统带宽的RB数。以5M带宽为例，eMTC的窄带划分如图3所示。Since the eMTC terminal performs resource allocation within a narrowband, the size of all narrowbands is 6 resource blocks (RB, Resource Block). The total number of downlink narrowbands is

in

Indicates the number of RBs of the entire system bandwidth. Taking the 5M bandwidth as an example, the narrowband division of eMTC is shown in Figure 3.

The downlink control channel (MTCPhysical Downlink Control Channel, MPDCCH) of the random access response (RandomAccess Response, RAR) of the eMTC terminal is fixed at one or two narrowband scheduling, determined by the high-level parameter mpdcch-NarrowbandsToMonitor-r13, when configured as 2 The time is determined according to Table 1.

Table 1 MPDCCH narrowband index of RAR.

Based on this point, the embodiment of the present invention reduces the interference of the source base station on the eMTC terminal switching cell by closing the source base station on the narrowband where the target base station and the eMTC terminal RAR are located, so that the eMTC terminal can smoothly switch to the target base station , so as to improve the success rate of the eMTC terminal switching cells.

Generally speaking, since the handover occurs at the edge of the two cells, after receiving the handover command from the source cell, the eMTC terminal will receive strong interference from the source cell when it initiates a random access process to the target cell, so the embodiment of the present invention After the source base station sends the handover command to the eMTC terminal, within a period of time, the source base station does not schedule services in the narrowband where the random access response (Random Access Response, RAR) of the target base station is located, so as to reduce the interference of the source base station on the handover cell of the eMTC terminal, The access success rate is improved, thereby effectively solving the problem in the prior art that the handover success rate of the eMTC terminal is reduced due to the interference of the source cell.

In step S102 of the embodiment of the present invention, close the scheduling service on the narrowband where the preset RAR is located by the source base station, and restart the scheduling service on the narrowband where the preset RAR is located after a predetermined time, including:

After closing the scheduling service on the narrowband where the preset RAR is located by the source base station, start a timer, and restart the scheduling service on the narrowband where the RAR is located after the timer reaches the predetermined time.

Specifically, the embodiment of the present invention uses a timer to monitor the time when the source base station closes the scheduling service on the narrowband where the preset RAR is located. When the timer reaches the predetermined time, it will restart scheduling business.

Of course, those skilled in the art can also monitor the time to close the scheduling service on the narrowband where the RAR is located in other ways, which is not specifically limited in the present invention.

The embodiment of the present invention is aimed at that the handover occurs at the edge of two cells. After the eMTC terminal receives the handover command from the source cell, it initiates random access to the target cell. At this time, the source cell is a strong interference to the eMTC terminal, affecting When the eMTC terminal accesses the target cell, the RAR is received, which in turn affects the handover success rate of the eMTC terminal.

In order to improve the handover success rate of the eMTC terminal in the above scenario, in the embodiment of the present invention, during the handover process of the eMTC terminal, after the source cell sends the handover command, no service is scheduled in the narrowband where the RAR of the target cell is located for a period of time, so as to reduce the need for the terminal to access the target Cell interference, improve access success rate.

Specifically include: the source cell receives the confirmation of the handover request sent by the target cell, the source cell sends a handover command to the terminal, the source cell starts the timer T, and step 4: the source cell does not schedule the narrowband service where the target cell RAR is located before the timer T expires , after the timer T expires, the service can be scheduled in the narrowband where the RAR of the target cell is located.

The method described in the embodiment of the present invention will be explained and illustrated in detail below in conjunction with FIG. 4:

Figure 4 is a schematic diagram of inter-cell handover. After the source cell issues a handover command, it does not schedule services at the narrowband position of the RAR of the target cell for a period of time. details as follows:

Step 401: The source base station initiates a handover request to the target base station.

In this step, the source base station initiates a handover request to the target base station after judging that the terminal satisfies the handover condition.

Step 402: the source base station receives the handover request response sent by the target base station.

In this step, the target base station sends a handover request response to the source base station, which includes the narrowband location of the RAR when the eMTC terminal accesses the target base station, here marked as NB1, and records the location of NB1.

Step 403: the source base station sends a handover command to the terminal.

In this step, the handover command includes basic information of the eMTC terminal accessing the target cell. After receiving the handover command, the terminal initiates random access to the target cell.

Step 404: The source base station starts a timer T (that is, the predetermined time value mentioned above in the embodiment of the present invention).

In this step, the suggested value of the timer T does not exceed the handover timer (that is, the preset cell handover time value mentioned above in the embodiment of the present invention).

Step 405: Judging whether the timer expires, if it is timed out, go to step 407; if not, go to step 406.

Step 406: The narrowband scheduling service is not located in the target cell RAR.

If the timer T does not expire, no service is scheduled on NB1. In the next subframe, proceed to step 405 to determine whether the timer expires.

Step 407: Restore the narrowband normal scheduling service where the RAR of the target cell is located.

Step 408: end.

Using the method of the present invention, through the interference coordination method of the source cell and the target cell, when the eMTC terminal randomly accesses the target cell during the handover process, the narrowband interference where the RAR is located is reduced, so the success rate of the eMTC handover of the system is improved, and the eMTC handover success rate is further improved. user experience.

The second embodiment of the present invention provides a device for a terminal to switch cells. Referring to FIG. 5, it is applied to a source base station, including:

a receiving unit, configured to receive a handover request response sent by the target base station;

A processing unit, configured to, after the receiving unit receives the handover request response sent by the target base station, send a handover command to the terminal in the handover cell, and close the scheduling on the narrowband where the preset random access response RAR of the source base station is located Business, after a predetermined time, restart the scheduling business on the narrowband where the preset RAR is located;

Wherein, the narrowband where the preset RAR is located is the narrowband where the target base station and the terminal RAR are located.

Moreover, the handover request response in the embodiment of the present invention carries the location of the narrowband where the terminal accesses the target base station RAR. And the handover command carries the information of the target base station and the location of the narrowband where the terminal accesses the preset RAR of the target base station.

In the embodiment of the present invention, after the source base station sends the handover command to the terminal, when the receiving unit receives the handover request response sent by the target base station, the processing unit does not schedule services in the narrowband where the target base station RAR is located for a period of time, so as to reduce the source base station. The interference to the cell handover of the terminal improves the access success rate, thereby effectively solving the problem of reducing the handover success rate of the terminal due to the interference of the source cell in the prior art.

During specific implementation, the processing unit in the embodiment of the present invention starts the timer after closing the scheduling service on the narrowband where the preset RAR is located by the source base station, and restarts the RAR after the timer counts to the predetermined time Scheduling service on the narrowband.

Specifically, the embodiment of the present invention uses a timer to monitor the time when the source base station closes the scheduling service on the narrowband where the preset RAR is located. When the timer reaches the predetermined time, it will restart scheduling business.

During specific implementation, the predetermined time in the embodiment of the present invention is less than the preset cell switching time.

It should be noted that the method described in the embodiment of the present invention can be applied to eMTC terminals. Of course, those skilled in the art can also apply the method described in the embodiment of the present invention to cell switching of other terminals such as 5G and 6G according to actual needs. superior.

The following will mainly take the eMTC terminal as an example to describe the embodiment of the present invention in detail:

其中

表示整个系统带宽的RB数。以5M带宽为例，eMTC的窄带划分如图3所示。Since the eMTC terminal performs resource allocation within a narrowband, the size of all narrowbands is 6 resource blocks (RB, Resource Block). The total number of downlink narrowbands is

in

Indicates the number of RBs of the entire system bandwidth. Taking the 5M bandwidth as an example, the narrowband division of eMTC is shown in Figure 3.

The downlink control channel (MTCPhysical Downlink Control Channel, MPDCCH) of the random access response (RandomAccess Response, RAR) of the eMTC terminal is fixed at one or two narrowband scheduling, determined by the high-level parameter mpdcch-NarrowbandsToMonitor-r13, when configured as 2 The time is determined according to Table 1.

Table 1 MPDCCH narrowband index of RAR.

Based on this point, the embodiment of the present invention reduces the interference of the source base station on the eMTC terminal switching cell by closing the source base station on the narrowband where the target base station and the eMTC terminal RAR are located, so that the eMTC terminal can smoothly switch to the target base station , so as to improve the success rate of the eMTC terminal switching cells.

Generally speaking, since the handover occurs at the edge of the two cells, after receiving the handover command from the source cell, the eMTC terminal will receive strong interference from the source cell when it initiates a random access process to the target cell, so the embodiment of the present invention After the source base station sends the handover command to the eMTC terminal, the source base station does not schedule services in the narrowband where the target base station RAR is located for a period of time, so as to reduce the interference of the source base station on the handover cell of the eMTC terminal and improve the access success rate, thus effectively solving the problem In the prior art, the handover success rate of the eMTC terminal is reduced due to the interference of the source cell.

Related content of the embodiment of the present invention can be understood with reference to the part of the first embodiment of the present invention, and will not be discussed in detail here.

The third embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, any one of the methods described in the first embodiment of the present invention can be realized. Steps in a method for a terminal to switch cells. Related content of the embodiment of the present invention can be understood with reference to the part of the first embodiment of the present invention, and will not be discussed in detail here.

The fourth embodiment of the present invention provides a base station. The base station includes: a memory, a processor, and a computer program stored in the memory and operable on the processor. The computer program is executed by the processor. When executed, the steps of any one of the methods described in the first embodiment of the present invention are realized. Related content of the embodiment of the present invention can be understood with reference to the part of the first embodiment of the present invention, and will not be discussed in detail here.

Although preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and therefore, the scope of the present invention should not be limited to the above-described embodiments.

Claims (10)

1. A method for a terminal to switch cells, characterized in that it is applied to a source base station, and the method comprises: After receiving the handover request response sent by the target base station, send a handover command to the terminal in the handover cell, and close the scheduling service on the narrowband where the preset random access response RAR of the source base station is located, and restart the preset random access response RAR after a predetermined time. Set the scheduling service on the narrowband where the RAR is located; Wherein, the narrowband where the preset RAR is located is the narrowband where the target base station and the terminal RAR are located. 2. The method according to claim 1, wherein, closing the scheduling service on the narrowband where the preset RAR is located by the source base station, and restarting the scheduling service on the narrowband where the preset RAR is located after a predetermined time, comprising: After closing the scheduling service on the narrowband where the preset RAR is located by the source base station, start a timer, and restart the scheduling service on the narrowband where the RAR is located after the timer reaches the predetermined time. 3. The method of claim 1 or 2, wherein, The predetermined time is less than the preset cell switching time. 4. The method of claim 1 or 2, wherein, The handover request response carries the location of the narrowband where the terminal accesses the target base station RAR. 5. The method of claim 1 or 2, wherein, The handover command carries the target base station information and the narrowband location where the terminal accesses the preset RAR of the target base station. 6. A device for a terminal to switch cells, characterized in that it is applied to a source base station, and the device comprises: a receiving unit, configured to receive a handover request response sent by the target base station; A processing unit, configured to, after the receiving unit receives the handover request response sent by the target base station, send a handover command to the terminal in the handover cell, and close the narrowband where the source base station preset random access response RAR is located dispatching service, after a predetermined time, restart the dispatching service on the narrowband where the preset RAR is located; Wherein, the narrowband where the preset RAR is located is the narrowband where the target base station and the terminal RAR are located. 7. The apparatus of claim 6, wherein The processing unit is further configured to start a timer after closing the scheduling service on the narrowband preset by the source base station where the RAR is located, and restart the scheduling service on the narrowband where the RAR is located after the timer counts to the predetermined time. 8. Apparatus as claimed in claim 6 or 7, characterized in that, The predetermined time is less than the preset cell switching time. 9. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method according to any one of claims 1 to 5 is realized. Steps in a method for a terminal to switch cells. 10. A base station, characterized in that the base station comprises: a memory, a processor, and a computer program stored in the memory and operable on the processor, when the computer program is executed by the processor Carrying out the steps of the method as claimed in any one of claims 1 to 5.

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