CN112118608B - Method, device and base station for switching cells by terminal - Google Patents
Method, device and base station for switching cells by terminal Download PDFInfo
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- CN112118608B CN112118608B CN201910541131.3A CN201910541131A CN112118608B CN 112118608 B CN112118608 B CN 112118608B CN 201910541131 A CN201910541131 A CN 201910541131A CN 112118608 B CN112118608 B CN 112118608B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000004044 response Effects 0.000 claims abstract description 32
- 238000004590 computer program Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 6
- 210000004027 cell Anatomy 0.000 description 77
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 210000004899 c-terminal region Anatomy 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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Abstract
The invention discloses a method, a device and a base station for switching cells by a terminal, wherein the method provided by the invention has the advantages that after a source base station sends a switching command to an eMTC terminal, the source base station randomly accesses a narrow-band unscheduled service where a response RAR is located in a target base station for a period of time, so that the interference of the source base station to the eMTC terminal switching cell is reduced, the access success rate is improved, and the problem that the eMTC terminal switching success rate is reduced due to the interference of the source cell in the prior art is effectively solved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a base station for a terminal to switch a cell.
Background
The 3GPP (3 rd Generation Partnership Project) defines an enhanced Machine Communication (eMTC) protocol in Release13 to support large-connection wide area network internet of things.
As shown in fig. 1, it can be known from fig. 1 that, in the prior art, after receiving a handover request acknowledgement sent by a target base station, a source base station directly sends a handover command to an eMTC terminal, and then the eMTC terminal initiates random access to the target base station, where the access mode affects the success rate of handover of the eMTC terminal.
Disclosure of Invention
The invention provides a method, a device and a base station for a terminal to switch cells, which are used for solving the problem of low success rate of switching when the terminal switches the cells in the prior art.
In order to solve the above technical problem, in a first aspect, the present invention provides a method for a terminal to switch a cell, where the method is applied to a source base station, and the method includes: after receiving a switching request response sent by a target base station, sending a switching command to a terminal in a switching cell, closing a scheduling service on a narrow band where a preset Random Access Response (RAR) of a source base station is located, and restarting the scheduling service on the narrow band where the preset RAR is located after preset time; and the narrow band where the preset RAR is located is a narrow band where the target base station and the terminal RAR are located.
In a second aspect, the present invention provides an apparatus for a terminal to switch a cell, where the apparatus is applied to a source base station, and the apparatus includes: a receiving unit, configured to receive a handover request response sent by a target base station; the processing unit is used for sending a switching command to a terminal in a switching cell after the receiving unit receives a switching request response sent by the target base station, closing a scheduling service on a narrow band where a random access response RAR (random access response) is preset by the source base station, and restarting the scheduling service on the narrow band where the RAR is preset after a preset time; and the preset narrow band where the RAR is located is a narrow band where the target base station and the C terminal RAR are located.
In a third aspect, the present invention provides a computer-readable storage medium, wherein the computer storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of any one of the methods for a terminal to switch cells.
In a fourth aspect, the present invention provides a base station, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of any of the methods.
In the method provided by the invention, after the source base station sends the switching command to the terminal, the source base station does not schedule the service in the narrow band where the Random Access Response (RAR) of the target base station is located for a period of time, so that the interference of the source base station to the terminal switching cell is reduced, the access success rate is improved, and the problem that the terminal switching success rate is reduced due to the interference of the source cell in the prior art is effectively solved.
Drawings
Fig. 1 is a flowchart illustrating a method for a terminal to switch a cell in the prior art;
fig. 2 is a flowchart illustrating a method for a terminal to switch a cell according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of narrowband partitioning according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another method for a terminal to switch cells according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cell switching apparatus of a terminal according to an embodiment of the present invention.
Detailed Description
In order to solve the problem of low success rate of terminal handover caused by interference of a source cell in the prior art, the present invention provides a method, an apparatus and a base station for terminal handover cell, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
A first embodiment of the present invention provides a method for a terminal to switch a cell, where a flow of the method is shown in fig. 2, and the method includes steps S201 to S203:
s201, receiving a switching request response sent by a target base station;
before this step, the source base station judges whether the switching condition is satisfied, if the switching condition is satisfied, the source base station sends a switching request to the target base station, and then the target base station returns a switching request response to the source base station.
It should be noted that, in the handover request response returned by the target base station to the source base station in the embodiment of the present invention, at least the narrowband position of the RAR when the terminal accesses the target base station is included, that is, the narrowband position of the RAR used by the target base station access terminal is to be carried in the handover request response returned by the target base station to the source base station, so that the terminal is accessed to the target base station.
S202, sending a switching command to a terminal in a switching cell, and closing a scheduling service on a narrow band where a source base station preset random access response RAR is located;
the handover command sent by the source base station to the terminal includes basic information of the terminal accessing the target cell, such as the target cell ID, the narrowband position of the RAR when the terminal accesses the target base station, and so on.
In the embodiment of the present invention, the narrowband where the preset RAR is located is a narrowband where a target base station and the terminal RAR are located.
And S203, restarting the scheduling service on the narrow band where the preset RAR is located after a preset time.
In specific implementation, the predetermined time is less than the preset cell switching time, which is a preset value of time used by the terminal to switch the cell, and when the time reaches the preset value, the terminal is triggered to initiate a connection request to all switchable cells, so 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, the source base station randomly accesses the non-scheduling service in the narrow band where the response is located in the target base station within a period of time, so as to reduce the interference of the source base station to the terminal handover cell, thereby improving the success rate of terminal access, and further effectively solving the problem in the prior art that the success rate of terminal handover is reduced due to the interference of the source cell.
It should be noted that the method according to the embodiment of the present invention may be applied to an enhanced Machine Type Communication (eMTC) terminal, and of course, a person skilled in the art may also apply the method according to the embodiment of the present invention to cell handover of other terminals such as 5G and 6G according to actual needs.
The method according to the embodiment of the present invention will be described in detail below mainly using an eMTC terminal as an example:
since the eMTC terminal performs Resource allocation within one narrow band, all the narrow bands have a size of 6 Resource Blocks (RBs). Total number of downlink narrow bands is
Wherein
The number of RBs representing the entire system bandwidth. For example, the narrow-band division of eMTC is shown in fig. 3, taking 5M bandwidth as an example.
A Downlink Control Channel (MPDCCH) of a Random Access Response (RAR) of the eMTC terminal is fixed to 1 or 2 narrowband schedules, determined by a high-layer parameter MPDCCH-narrow bandwidth monitor-r13, and determined according to table 1 when 2 random access responses (rarcs) are configured.
Table 1 MPDCCH narrowband index for RAR.
Based on the point, the embodiment of the invention reduces the interference of the source base station to the eMTC terminal switching cell by closing the scheduling service of the source base station on the narrow band where the target base station and the eMTC terminal RAR are located, so that the eMTC terminal can be smoothly switched to the target base station, and the success rate of the eMTC terminal switching cell is improved.
Generally, because the switching occurs at the edge of two cells, after receiving a switching command of a source cell, the eMTC terminal may be subject to strong interference from the source cell during a process of initiating a Random Access to a target cell, so that in the embodiment of the present invention, after the source base station sends the switching command to the eMTC terminal, the source base station does not schedule a service in a narrow band where a Random Access Response (RAR) is located at the target base station within a period of time, so as to reduce interference of the source base station on the switching cell of the eMTC terminal, improve an Access success rate, and thereby effectively solve the problem that the switching success rate of the eMTC terminal is reduced due to the interference of the source cell in the prior art.
In step S102 of the embodiment of the present invention, the step of closing the scheduling service on the narrowband where the RAR is preset by the source base station, and restarting the scheduling service on the narrowband where the RAR is preset after a preset time includes:
and after the scheduling service on the narrow band where the RAR is located is closed, starting a timer, and after the timer times to the preset time, restarting the scheduling service on the narrow band where the RAR is located.
Specifically, the embodiment of the present invention monitors the time for the source base station to close the scheduling service on the narrow band where the preset RAR is located by using the timer, and when the timer reaches the preset time, the scheduling service on the narrow band where the preset RAR is located is restarted.
Of course, those skilled in the art may also monitor the time for closing the scheduling service on the narrow band where the RAR is located in other manners, which is not specifically limited by the present invention.
The embodiment of the invention aims at that the switching occurs at the edge of two cells, an eMTC terminal initiates random access to a target cell after receiving a switching command of a source cell, and at the moment, the source cell has strong interference to the eMTC terminal, thereby influencing RAR receiving when the eMTC terminal accesses the target cell and further influencing the switching success rate of the eMTC terminal.
In order to improve the switching success rate of the eMTC terminal under the above scenario, in the switching process of the eMTC terminal, after the source cell issues the switching command, the embodiment of the present invention does not schedule the service in the narrow band where the target cell RAR is located for a period of time, so as to reduce the interference on the terminal accessing the target cell, and improve the access success rate.
The method specifically comprises the following steps: the source cell receives the switching request confirmation sent by the target cell, the source cell sends a switching command to the terminal, the source cell starts a timer T, and the fourth step is that: before the timer T is overtime, the source cell does not schedule services in the narrow band where the target cell RAR is located, and after the timer T is overtime, the source cell can schedule services in the narrow band where the target cell RAR is located.
The method according to an embodiment of the invention will be explained and illustrated in detail below with reference to fig. 4:
fig. 4 is a schematic diagram of inter-cell handover, where after a handover command is issued, a source cell does not schedule a service in a narrow-band location of a target cell RAR for a certain period of time. The method comprises the following specific steps:
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: and the source base station receives a switching 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, where the handover request response includes a narrowband position of the RAR when the eMTC terminal accesses the target base station, where the narrowband position is marked as NB1, and records the position of NB 1.
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. And after receiving the switching command, the terminal initiates random access to the target cell.
Step 404: the source base station starts a timer T (i.e., the predetermined time value described above in the embodiment of the present invention).
In this step, the proposed value of the timer T does not exceed the handover timer (i.e., the aforementioned preset handover cell time value in the embodiment of the present invention).
Step 405: judging whether the timer is overtime, if yes, entering step 407; if not, step 406 is entered.
Step 406: and service is not scheduled in the narrow band where the target cell RAR is located.
If timer T does not time out, no traffic is scheduled on NB 1. The next subframe continues to step 405 where it is determined whether the timer has expired.
Step 407: and recovering the normal scheduling service of the narrow band where the target cell RAR is located.
Step 408: and (6) ending.
By adopting the method, when the eMTC terminal randomly accesses the target cell in the switching process, the interference of the RAR in the narrow band is reduced through the interference coordination method of the source cell and the target cell, so that the success rate of the eMTC switching of the system is improved, and further the user experience is improved.
A second embodiment of the present invention provides an apparatus for a terminal to switch a cell, referring to fig. 5, which is applied to a source base station, and includes:
a receiving unit, configured to receive a handover request response sent by a target base station;
the processing unit is used for sending a switching command to a terminal in a switching cell after the receiving unit receives a switching request response sent by a target base station, closing the scheduling service on the narrow band where the source base station preset random access response RAR is located, and restarting the scheduling service on the narrow band where the preset RAR is located after preset time;
and the narrow band where the preset RAR is located is a narrow band where the target base station and the terminal RAR are located.
In addition, the handover request response of the embodiment of the present invention carries the location of the narrow band where the terminal accesses the target base station RAR. And the switching command carries the target base station information and the position of the narrow band where the terminal accesses the target base station preset RAR.
In the embodiment of the invention, after the source base station sends the switching command to the terminal and the receiving unit receives the switching request response sent by the target base station, the processing unit processes the service which is not scheduled in the narrow band where the target base station RAR is located within a period of time so as to reduce the interference of the source base station to the terminal switching cell and improve the access success rate, thereby effectively solving the problem that the success rate of the terminal switching is reduced due to the interference of the source cell in the prior art.
In specific implementation, the processing unit in the embodiment of the present invention starts a timer after the scheduling service on the narrow band where the RAR is preset by the source base station is closed, and restarts the scheduling service on the narrow band where the RAR is located after the timer times the preset time.
Specifically, the embodiment of the present invention monitors the time for the source base station to close the scheduling service on the narrow band where the preset RAR is located by using the timer, and when the timer reaches the preset time, the scheduling service on the narrow band where the preset RAR is located is restarted.
In specific implementation, the predetermined time is less than the preset cell switching time.
It should be noted that the method according to the embodiment of the present invention may be applied to an eMTC terminal, and of course, a person skilled in the art may also apply the method according to the embodiment of the present invention to cell handover of other terminals such as 5G and 6G according to actual needs.
The following will mainly use an eMTC terminal as an example to describe the embodiments of the present invention in detail:
since the eMTC terminal performs Resource allocation within one narrow band, all the narrow bands have a size of 6 Resource Blocks (RBs). Total number of downlink narrow bands is
Wherein
The number of RBs representing the entire system bandwidth. For example, the narrow-band division of eMTC is shown in fig. 3, taking 5M bandwidth as an example.
A Downlink Control Channel (MPDCCH) of a Random Access Response (RAR) of the eMTC terminal is fixed to 1 or 2 narrowband schedules, and is determined by a high-layer parameter MPDCCH-narrowband to monitor-r13, and when the number of Downlink Control channels is 2, the Downlink Control Channel (MPDCCH) is determined according to table 1.
Table 1 MPDCCH narrowband index for RAR.
Based on the point, the embodiment of the invention reduces the interference of the source base station to the eMTC terminal switching cell by closing the scheduling service of the source base station on the narrow band where the target base station and the eMTC terminal RAR are located, so that the eMTC terminal can be smoothly switched to the target base station, and the success rate of the eMTC terminal switching cell is improved.
Generally speaking, because the switching occurs at the edge of two cells, after receiving the switching command of the source cell, the eMTC terminal may be strongly interfered by the source cell during the process of initiating the random access to the target cell, so in the embodiment of the present invention, after the source base station sends the switching command to the eMTC terminal, the source base station does not schedule a service in the narrow band where the target base station RAR is located within a period of time, so as to reduce the interference of the source base station to the switching cell of the eMTC terminal, and improve the access success rate, thereby effectively solving the problem that the switching success rate of the eMTC terminal is reduced due to the interference of the source cell in the prior art.
The relevance of the embodiments of the present invention can be understood with reference to the first embodiment of the present invention, which is not discussed in detail herein.
A third embodiment of the present invention provides a computer-readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the method for a terminal to switch cells according to any one of the first embodiments of the present invention. The relevance of the embodiments of the present invention can be understood with reference to the first embodiment of the present invention, which is not discussed in detail herein.
A fourth embodiment of the present invention provides a base station, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to any one of the first embodiments of the invention. The relevance of the embodiments of the present invention can be understood with reference to the first embodiment of the present invention, which is not discussed in detail herein.
Although the 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 the scope of the invention should not be limited to the embodiments described above.
Claims (10)
1. A method for a terminal to switch a cell is applied to a source base station, and the method comprises the following steps:
after receiving a switching request response sent by a target base station, sending a switching command to a terminal in a switching cell, closing a scheduling service on a narrow band where a preset random access response RAR of a source base station is located, and restarting the scheduling service on the narrow band where the preset RAR is located after a preset time;
and the narrow band where the preset RAR is located is a narrow band where the target base station and the terminal RAR are located.
2. The method of claim 1, wherein the step of closing the scheduling service on the narrow band where the RAR is preset by the source base station, and restarting the scheduling service on the narrow band where the RAR is preset after a predetermined time includes:
and after the scheduling service on the narrow band where the RAR is located is closed, starting a timer, and after the timer times to the preset time, restarting the scheduling service on the narrow band where the RAR is located.
3. The method of claim 1 or 2,
the predetermined time is less than a preset cell switching time.
4. The method of claim 1 or 2,
and the switching request response carries the position of the narrow band where the terminal is accessed to the target base station RAR.
5. The method of claim 1 or 2,
and the switching command carries the target base station information and the position of the narrow band where the terminal accesses the preset RAR of the target base station.
6. An apparatus for a terminal to switch a cell, applied to a source base station, the apparatus comprising:
a receiving unit, configured to receive a handover request response sent by a target base station;
the processing unit is used for sending a switching command to a terminal in a switching cell after the receiving unit receives a switching request response sent by the target base station, closing the scheduling service on the narrow band where the source base station preset random access response RAR is located, and restarting the scheduling service on the narrow band where the preset RAR is located after preset time;
and the narrow band where the preset RAR is located is a narrow band where the target base station and the terminal RAR are located.
7. The apparatus of claim 6,
the processing unit is further configured to start a timer after the scheduling service on the narrowband where the RAR is located is closed, and restart the scheduling service on the narrowband where the RAR is located after the timer times the preset time.
8. The apparatus of claim 6 or 7,
the predetermined time is less than the preset cell switching time.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for a terminal to switch cells according to any one of claims 1 to 5.
10. A base station, characterized in that the base station comprises: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN201910541131.3A CN112118608B (en) | 2019-06-21 | 2019-06-21 | Method, device and base station for switching cells by terminal |
| PCT/CN2020/091033 WO2020253450A1 (en) | 2019-06-21 | 2020-05-19 | Method and device for performing cell switching for terminal, base station, and computer readable storage medium |
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| CN201910541131.3A CN112118608B (en) | 2019-06-21 | 2019-06-21 | Method, device and base station for switching cells by terminal |
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| CN112118608B true CN112118608B (en) | 2023-01-10 |
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| CN107708162A (en) * | 2016-08-09 | 2018-02-16 | 中兴通讯股份有限公司 | Base station-to-base station handover method and system, uplink authorization configuration, method of reseptance and device |
| CN109151980A (en) * | 2017-06-16 | 2019-01-04 | 维沃移动通信有限公司 | A kind of random access procedure lead code sends the control method and terminal of power |
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| EP3180955B1 (en) * | 2014-08-15 | 2019-08-14 | Interdigital Patent Holdings, Inc. | Supporting random access and paging procedures for reduced capability wtrus in an lte system |
| WO2018000255A1 (en) * | 2016-06-29 | 2018-01-04 | 华为技术有限公司 | Access method, user equipment, control device, and communication system |
| CN106792497B (en) * | 2016-11-03 | 2018-10-16 | 展讯通信（上海）有限公司 | Base station, user equipment and its cut-in method |
| CN112738858B (en) * | 2017-03-24 | 2022-05-31 | 华为技术有限公司 | Method and device for switching |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708162A (en) * | 2016-08-09 | 2018-02-16 | 中兴通讯股份有限公司 | Base station-to-base station handover method and system, uplink authorization configuration, method of reseptance and device |
| CN109151980A (en) * | 2017-06-16 | 2019-01-04 | 维沃移动通信有限公司 | A kind of random access procedure lead code sends the control method and terminal of power |
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| R2-1706705 "Baseline handover procedure for inter gNB handover in NR";Huawei等;《3GPP tsg_ran\WG2_RL2》;20170617;全文 * |
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