CN108112033B - Method and device for switching primary carrier and secondary carrier - Google Patents
Method and device for switching primary carrier and secondary carrier Download PDFInfo
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- CN108112033B CN108112033B CN201611055161.6A CN201611055161A CN108112033B CN 108112033 B CN108112033 B CN 108112033B CN 201611055161 A CN201611055161 A CN 201611055161A CN 108112033 B CN108112033 B CN 108112033B
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- 230000002776 aggregation Effects 0.000 claims abstract description 27
- 238000004220 aggregation Methods 0.000 claims abstract description 27
- 239000000969 carrier Substances 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 230000036963 noncompetitive effect Effects 0.000 claims description 18
- 238000004891 communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000012790 confirmation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000011664 signaling Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a method and a device for switching main and auxiliary carriers, which relate to the technical field of communication, and the method comprises the following steps: in the process that the terminal moves between adjacent carrier aggregation cells, a main carrier cell determines whether main and auxiliary carrier switching is needed or not according to a received measurement report of the terminal; if the main carrier cell determines that the main carrier and the auxiliary carrier need to be switched, informing a target auxiliary carrier cell to carry out main carrier and auxiliary carrier switching preparation; the main carrier cell receives a time advance obtained from the target auxiliary carrier cell during a preparation period for switching the main carrier and the auxiliary carrier; and the main carrier cell generates a main and auxiliary carrier switching command carrying the time advance and sends the main and auxiliary carrier switching command to the terminal so that the terminal can utilize the time advance to complete main and auxiliary carrier switching. The embodiment of the invention reduces the switching time delay of the main carrier and the auxiliary carrier of the terminal in the carrier aggregation scene and reduces the probability of the disconnection of the terminal in the switching process in a simple and reliable mode.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for switching primary and secondary carriers.
Background
At present, the service demand in an enhanced Long Term Evolution Advanced (LTE-a) system is increasing, the use of carrier aggregation technology is becoming more common, both the cell and the number of users are on a trend of increasing density, and the user experience in a mobile state is sensitive to the handover delay. Therefore, the handover delay becomes a key index which is relatively concerned by operators.
The user experience of a terminal using carrier aggregation technology mainly depends on the service transmission rate and service continuity.
For the service transmission rate guarantee under the switching scene, the method mainly adopts the mode of switching with carrier at present, namely, the selection and the confirmation are firstly made for the auxiliary carrier switched to the target side by the terminal in the switching process, after the terminal is switched to the target side, the carrier aggregation can be rapidly entered, the high-speed service transmission is continued, and the deactivation and the activation operation of the auxiliary carrier in the switching process are avoided. However, this approach does not help to enhance the traffic continuity experience of mobility.
Service continuity under a carrier aggregation switching scene is closely related to switching time delay, and excessive switching time delay causes service blocking and influences user experience. At present, the main adopted process is still the common handover process, but some non-common handover processes are also adopted, for example, in a method for realizing soft handover based on a carrier aggregation technology, a concept of soft handover is provided, when a terminal is switched between a main carrier and an auxiliary carrier, a base station marks the current main cell as a target auxiliary cell, informs the terminal to modify the current main cell into the target auxiliary cell under the condition of keeping service connection, and switches a control signaling to be connected to the target auxiliary cell. This kind of mode easily leads to the terminal to take place to drop, causes more serious influence to user experience.
Based on the above consideration, how to reduce the switching delay in the carrier aggregation scene as much as possible under the condition that the terminal is not dropped as much as possible is very valuable.
Disclosure of Invention
According to the method and the device for switching the main carrier and the auxiliary carrier, which are provided by the embodiment of the invention, the problem of large switching delay in a carrier aggregation scene in the prior art is solved, or the defect that the probability of disconnection of a terminal is increased due to the reduction of the switching delay in a carrier aggregation state is overcome.
The method for switching the main carrier and the auxiliary carrier provided by the embodiment of the invention comprises the following steps:
in the process that a terminal moves between adjacent carrier aggregation cells, a main carrier cell determines whether main and auxiliary carriers need to be switched or not according to a received measurement report of the terminal;
if the main carrier cell determines that the main carrier and the auxiliary carrier need to be switched, informing a target auxiliary carrier cell to carry out main carrier and auxiliary carrier switching preparation;
the main carrier cell receives a time advance obtained from the target auxiliary carrier cell during a preparation period for switching the main carrier and the auxiliary carrier;
and the main carrier cell generates a main and auxiliary carrier switching command carrying the time advance and sends the main and auxiliary carrier switching command to the terminal so that the terminal can utilize the time advance to complete main and auxiliary carrier switching.
Preferably, the determining, by the primary carrier cell according to the received measurement report of the terminal, whether the primary and secondary carriers need to be switched includes:
and the main carrier cell determines whether the main carrier and the auxiliary carrier need to be switched or not by judging whether the measurement report of the terminal meets a pre-configured switching threshold or not.
Preferably, after the notifying the target secondary carrier cell to prepare for switching the primary and secondary carriers, the method further includes:
the target auxiliary carrier cell distributes a special access preamble to the terminal;
triggering the terminal to perform non-competitive random access to the target secondary carrier cell by using the special access preamble;
after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating a time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble;
after calculating the timing advance, the target secondary carrier cell recovers the dedicated access preamble.
Preferably, the terminal completing the switching of the primary and secondary carriers by using the timing advance includes:
and the terminal adjusts the uplink time sequence by using the time lead and exchanges the configuration of the main carrier and the auxiliary carrier.
A method for switching primary and secondary carriers according to another embodiment of the present invention includes:
in the process that a terminal moves between adjacent carrier aggregation cells, a target auxiliary carrier cell performs main and auxiliary carrier switching preparation according to a main and auxiliary carrier switching request from a main carrier cell;
the target auxiliary carrier cell obtains a time lead during the preparation period of switching the main and auxiliary carriers;
and the target auxiliary carrier cell sends the time advance to the main carrier cell so that the main carrier cell sends a main and auxiliary carrier switching command carrying the time advance to the terminal, and the terminal completes main and auxiliary carrier switching by utilizing the time advance.
Preferably, the preparing, by the target secondary carrier cell, for the primary and secondary carrier handover according to the primary and secondary carrier handover request from the primary carrier cell includes:
the target auxiliary carrier cell distributes a special access preamble to the terminal;
and triggering the terminal to perform non-competitive random access to the target secondary carrier cell by using the special access preamble.
Preferably, the obtaining of the time advance by the target secondary carrier cell during the preparation for switching the primary and secondary carriers includes:
and after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating the time advance for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble.
According to the storage medium provided by the embodiment of the invention, the program for realizing the main and auxiliary carrier switching method is stored.
The main and auxiliary carrier switching device provided by the embodiment of the invention is arranged in a main carrier cell and comprises:
a switching judgment module, configured to determine whether primary and secondary carrier switching is required according to a received measurement report of a terminal moving between adjacent carrier aggregation cells;
the switching preparation notification module is used for notifying a target auxiliary carrier cell to carry out main and auxiliary carrier switching preparation when the main and auxiliary carrier switching is determined to be needed;
a time advance acquisition module, configured to receive a time advance obtained from the target secondary carrier cell during preparation for switching primary and secondary carriers;
and the switching notification module is used for generating a main carrier switching command carrying the time advance and sending the main carrier switching command to the terminal so that the terminal can utilize the time advance to complete main carrier switching and auxiliary carrier switching.
According to another embodiment of the present invention, a primary and secondary carrier switching apparatus is provided, which is disposed in a target secondary carrier cell, and includes:
the switching preparation module is used for performing switching preparation of the main carrier and the auxiliary carrier according to a main carrier and auxiliary carrier switching request from a main carrier cell and obtaining a time lead during the switching preparation of the main carrier and the auxiliary carrier;
and the time advance sending module is used for sending the time advance to the main carrier cell so that the main carrier cell sends a main and auxiliary carrier switching command carrying the time advance to the terminal, and the terminal completes the main and auxiliary carrier switching by utilizing the time advance.
Preferably, the handover preparation module allocates a dedicated access preamble to the terminal, triggers the terminal to perform non-contention random access to the target secondary carrier cell by using the dedicated access preamble, and calculates a time advance for time synchronization between the target secondary carrier cell and the terminal by using the dedicated access preamble after the terminal performs non-contention random access to the target secondary carrier cell.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the embodiment of the invention reduces the switching time delay of the main carrier and the auxiliary carrier of the terminal in the carrier aggregation scene and reduces the probability of the disconnection of the terminal in the switching process in a simple and reliable mode.
Drawings
Fig. 1 is a block diagram of a method for switching primary and secondary carriers according to an embodiment of the present invention;
fig. 2 is a block diagram of a primary and secondary carrier switching method according to another embodiment of the present invention;
fig. 3 is a block diagram of a primary and secondary carrier switching apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart of primary and secondary carrier switching according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described below are only for the purpose of illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a block diagram of a method for switching a primary carrier and a secondary carrier according to an embodiment of the present invention, and as shown in fig. 1, the steps include:
step S101: and in the process that the terminal moves between adjacent carrier aggregation cells, the main carrier cell determines whether the main carrier cell and the auxiliary carrier cell need to be switched or not according to the received measurement report of the terminal.
Specifically, the primary carrier cell determines whether primary and secondary carrier switching is required by determining whether a measurement report of the terminal meets a pre-configured switching threshold.
Step S102: and if the main carrier cell determines that the main carrier and the auxiliary carrier need to be switched, informing a target auxiliary carrier cell to prepare for the main carrier and the auxiliary carrier.
Specifically, after receiving the notification, the target secondary carrier cell allocates a dedicated access preamble to the terminal, and uses the dedicated access preamble to trigger the terminal to perform non-contention random access to the target secondary carrier cell, and uses the dedicated access preamble to calculate a time advance for time synchronization between the target secondary carrier cell and the terminal after the terminal performs non-contention random access to the target secondary carrier cell, and after calculating the time advance, the target secondary carrier cell recovers the dedicated access preamble.
Step S103: and the main carrier cell receives the time advance obtained from the target auxiliary carrier cell during the preparation period of main and auxiliary carrier switching.
Step S104: and the main carrier cell generates a main and auxiliary carrier switching command carrying the time advance and sends the main and auxiliary carrier switching command to the terminal so that the terminal can utilize the time advance to complete main and auxiliary carrier switching.
Step S104 includes: and the terminal adjusts the uplink time sequence by using the time advance, exchanges the configuration of the main carrier and the auxiliary carrier, and then informs a new main carrier cell (namely the original target auxiliary carrier cell) of the completion of the switching of the main carrier and the auxiliary carrier.
It will be understood by those skilled in the art that all or part of the steps in the method according to the above embodiments may be implemented by a program, which may be stored in a computer-readable storage medium, and includes steps S101 to S104 when the program is executed. The storage medium may be ROM/RAM, magnetic disk, optical disk, etc.
Fig. 2 is a block diagram of a primary and secondary carrier switching method according to another embodiment of the present invention, as shown in fig. 2, including:
step S201: and in the process that the terminal moves between adjacent carrier aggregation cells, the target auxiliary carrier cell performs main and auxiliary carrier switching preparation according to a main and auxiliary carrier switching request from the main carrier cell.
Step S201 includes: and the target auxiliary carrier cell distributes a special access preamble for the terminal, and triggers the terminal to perform non-competitive random access to the target auxiliary carrier cell by using the special access preamble.
Step S202: and the target auxiliary carrier cell obtains the time lead during the preparation period of switching the main and auxiliary carriers.
Step S202 includes: and after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating the time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble.
Specifically, during the period that the terminal randomly accesses the target secondary carrier cell in a non-contention manner, the terminal sends the dedicated access preamble to the target secondary carrier cell, and the target secondary carrier cell may obtain the time advance by performing correlation operation on the received dedicated access preamble and a local pilot sequence.
Step S203: and the target auxiliary carrier cell sends the time advance to the main carrier cell so that the main carrier cell sends a main and auxiliary carrier switching command carrying the time advance to the terminal, and the terminal completes main and auxiliary carrier switching by utilizing the time advance.
It will be understood by those skilled in the art that all or part of the steps in the method according to the above embodiments may be implemented by a program, which may be stored in a computer-readable storage medium, and includes steps S201 to S203 when the program is executed. The storage medium may be ROM/RAM, magnetic disk, optical disk, etc.
The embodiment is suitable for the LTE system carrier aggregation networking scene.
In the embodiment, the non-contention random access process is advanced to the time before the main carrier cell sends the main carrier and auxiliary carrier switching command to the terminal, so that the main carrier and auxiliary carrier switching time delay is reduced;
in the embodiment, before the main carrier cell sends the main carrier switching command and the auxiliary carrier switching command to the terminal, the time advance is calculated and then the special access preamble is recovered, so that the allocation and recovery time of the special access preamble for non-competitive random access is reduced, namely, the occupation time of the special access preamble of a single terminal is reduced, and the use efficiency of the special access preamble is improved.
Fig. 3 is a block diagram of a primary and secondary carrier switching apparatus according to an embodiment of the present invention, as shown in fig. 3, including: the system comprises a switching judgment module, a switching preparation notification module, a time lead acquisition module and a switching notification module which are arranged in a main carrier cell, and a switching preparation module and a time lead sending module which are arranged in a target auxiliary carrier cell.
The switching judgment module determines whether the main carrier and the auxiliary carrier need to be switched according to the received measurement report of the terminal moving between the adjacent carrier aggregation cells, and if the main carrier and the auxiliary carrier need to be switched, the switching preparation notification module notifies the target auxiliary carrier cell to carry out main carrier and auxiliary carrier switching preparation through the main carrier and auxiliary carrier switching request. The switching preparation module performs main and auxiliary carrier switching preparation according to a main and auxiliary carrier switching request from a main carrier cell, obtains a time lead during the main and auxiliary carrier switching preparation, specifically, allocates a dedicated access preamble to the terminal, triggers the terminal to perform non-competitive random access to the target auxiliary carrier cell by using the dedicated access preamble, calculates the time lead for time synchronization between the target auxiliary carrier cell and the terminal by using the dedicated access preamble received in the non-competitive random access process after the terminal performs non-competitive random access to the target auxiliary carrier cell, and then recovers the dedicated access preamble. And the time advance sending module sends the time advance to a time advance acquisition module of the main carrier cell. And the time lead acquisition module receives the time lead and transmits the time lead to the switching notification module, and the switching notification module generates a main carrier and auxiliary carrier switching command carrying the time lead and transmits the main carrier and auxiliary carrier switching command to the terminal so that the terminal can utilize the time lead to complete main carrier and auxiliary carrier switching.
The embodiment of the invention provides a method for reducing the switching delay of a main carrier and an auxiliary carrier, which specifically comprises the following steps:
the method comprises the following steps: and the main carrier cell judges whether the main carrier and the auxiliary carrier need to be switched for the terminal.
Step two: and if the main carrier cell judges that the main carrier cell and the auxiliary carrier cell need to be switched to the terminal, the main carrier cell sends a switching request to a switching target auxiliary carrier cell.
Step three: the target auxiliary carrier wave cell is allocated with a special access preamble and actively sends a message to inform the terminal to use the preamble to trigger non-competitive random access.
Step four: and after receiving the special access preamble, the target secondary cell calculates the time advance and sends the time advance to the main carrier cell through a switching request confirmation message.
Step five: and after receiving the switching request confirmation message of the target secondary cell, the primary carrier cell sends the time advance to the terminal through a switching command.
Step six: the terminal receives the switching command, uses the time lead to adjust the uplink frame head, replies the switching completion to the target auxiliary cell, and modifies the main carrier cell as the auxiliary cell and the target auxiliary cell as the main carrier cell.
Fig. 4 is a flowchart of reducing the time delay for switching between the primary and secondary carriers according to the embodiment of the present invention, and as shown in fig. 4, the steps include:
step 1: and the main carrier cell judges whether the main carrier and the auxiliary carrier need to be executed according to the configured switching threshold and the measurement result reported by the terminal.
Specifically, in a carrier aggregation scenario, a main carrier cell receives a terminal measurement report, compares an A3/a5 threshold configured by a base station network manager, and determines whether a handover command needs to be issued to trigger a terminal to perform main and auxiliary carrier handover. If the threshold configuration value of A3/A5 is met, the switching is required, and the main carrier cell sends a main carrier switching request and an auxiliary carrier switching request to the auxiliary carrier cell through an inter-station interface; otherwise, the current state of the main and auxiliary carriers is maintained unchanged.
Step 2: after the auxiliary carrier cell receives the main and auxiliary carrier switching request of the main carrier cell, a special access preamble is distributed, and the terminal is informed to use the preamble to initiate a non-competitive random access process in the auxiliary carrier cell.
Specifically, after receiving a main carrier and auxiliary carrier switching request of a main carrier cell, an auxiliary carrier cell allocates a special access preamble to the terminal, and the auxiliary carrier cell issues a special Msg0 to inform the terminal to use the preamble to initiate a non-contention random access process in the auxiliary carrier cell through an LTE layer 2. If the special access preamble distribution fails, the auxiliary carrier cell sends a main and auxiliary carrier switching request confirmation message through the inter-station interface to inform that the main carrier cell switching preparation fails.
And step 3: and the terminal receives a message Msg0 sent by the auxiliary carrier cell, suspends the current service, and initiates a non-competitive random access process to the auxiliary carrier cell by using the special access preamble specified in the Msg 0.
If the first random access initiation fails, the terminal will reinitiate the non-contention random access process until reaching the configured maximum random access times. After the terminal executes the process, the terminal recovers the service and maintains the current carrier aggregation state.
And 4, step 4: if the auxiliary carrier cell does not receive the non-competitive random access process initiated by the terminal, the timer is overtime or the non-competitive random access process is failed, the auxiliary carrier cell sends a main and auxiliary carrier switching request confirmation message to the main carrier cell through the inter-station interface to inform that the main carrier cell is failed in switching preparation, otherwise, the main carrier cell is informed that the main carrier cell is successful in switching preparation. When the secondary carrier cell sends a message of successful handover preparation to the primary carrier cell through the inter-site interface, the secondary carrier cell needs to carry the Time Advance (Time Advance, TA) calculated through the non-contention access process.
And 5: after receiving the message of successful handover preparation sent by the secondary carrier cell, the primary carrier cell issues a reconfiguration instruction (i.e., a primary and secondary carrier handover command shown in fig. 3) carrying a timing advance and a mobility control element to the terminal, and simultaneously notifies the terminal to modify the target secondary carrier into the primary carrier and modify the primary carrier into the secondary carrier.
Step 6: after receiving the reconfiguration signaling, the terminal modifies the configuration of the main carrier and the auxiliary carrier, modifies the main carrier into the auxiliary carrier and modifies the target auxiliary carrier into the main carrier; after the configuration is completed, the terminal sends a reconfiguration completion message to the current main carrier cell, the states of other auxiliary cells are unchanged, and the switching of the main carrier and the auxiliary carrier is completed.
That is to say, in a scenario where a terminal is in a carrier aggregation state and needs to perform primary and secondary carrier switching, in the embodiment of the present invention, before a primary carrier cell issues a reconfiguration signaling with a mobility control element in a switching preparation process, a primary non-contention random access from the terminal to a switching target secondary carrier cell is actively triggered by the switching target secondary carrier cell to obtain a time advance, and the primary carrier cell issues the reconfiguration signaling with the mobility control element to the terminal, and the terminal uses the time advance to adjust an uplink timing sequence and switches signaling data from the primary carrier cell to the target secondary carrier cell, thereby completing a switching process and interchanging relationships between a primary carrier and a secondary carrier.
In summary, the embodiments of the present invention have the following technical effects:
1. the embodiment of the invention can reduce the switching time delay based on the carrier aggregation technology, and the terminal reduces the distribution and recovery time of the non-competitive access preamble in a mode of advancing the non-competitive random access process during the switching between the main carrier and the auxiliary carrier of the carrier aggregation, thereby improving the use efficiency of the non-competitive access preamble, reducing the use frequency of the competitive random access in the switching process and achieving the purpose of reducing the switching time delay.
2. The embodiment of the invention is suitable for the switching process of the terminal moving between the main carrier cell and the auxiliary carrier cell under the carrier aggregation scene.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (8)
1. A method for switching primary and secondary carriers comprises the following steps:
in the process that the terminal moves between adjacent carrier aggregation cells, a main carrier cell determines whether main and auxiliary carrier switching is needed or not according to a received measurement report of the terminal;
if the main carrier cell determines that the main carrier and the auxiliary carrier need to be switched, informing a target auxiliary carrier cell to carry out main carrier and auxiliary carrier switching preparation;
the main carrier cell receives a time advance obtained from the target auxiliary carrier cell during a preparation period for switching the main carrier and the auxiliary carrier;
the main carrier cell generates a main and auxiliary carrier switching command carrying the time advance and sends the main and auxiliary carrier switching command to the terminal, so that the terminal can complete main and auxiliary carrier switching by using the time advance;
after the notifying the target secondary carrier cell to prepare for the primary and secondary carrier switching, the method further includes:
the target auxiliary carrier cell distributes a special access preamble to the terminal;
triggering the terminal to perform non-competitive random access to the target secondary carrier cell by using the special access preamble;
after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating a time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble;
after calculating the timing advance, the target secondary carrier cell recovers the dedicated access preamble.
2. The method of claim 1, wherein the determining, by the primary carrier cell according to the received measurement report of the terminal, whether the primary and secondary carriers need to be switched comprises:
and the main carrier cell determines whether the main carrier and the auxiliary carrier need to be switched or not by judging whether the measurement report of the terminal meets a pre-configured switching threshold or not.
3. The method of claim 1, wherein the terminal completing the primary and secondary carrier switching by using the timing advance comprises:
and the terminal adjusts the uplink time sequence by using the time lead and exchanges the configuration of the main carrier and the auxiliary carrier.
4. A method for switching primary and secondary carriers comprises the following steps:
in the process that a terminal moves between adjacent carrier aggregation cells, a target auxiliary carrier cell performs main and auxiliary carrier switching preparation according to a main and auxiliary carrier switching request from a main carrier cell;
the target auxiliary carrier cell obtains a time lead during the preparation period of switching the main and auxiliary carriers;
the target secondary carrier cell sends the time advance to the main carrier cell so that the main carrier cell sends a main secondary carrier switching command carrying the time advance to the terminal, and the terminal completes main secondary carrier switching by using the time advance;
the target auxiliary carrier cell performs main and auxiliary carrier switching preparation according to the main and auxiliary carrier switching request from the main carrier cell, and the preparation comprises the following steps:
the target auxiliary carrier cell distributes a special access preamble to the terminal;
triggering the terminal to perform non-contention random access to the target secondary carrier cell by using the dedicated access preamble so as to:
after the terminal non-competitively and randomly accesses the target secondary carrier cell, the main carrier cell utilizes the special access preamble to calculate the time lead for synchronizing the time between the target secondary carrier cell and the terminal; after calculating the time advance, the target secondary carrier cell recovers the dedicated access preamble.
5. The method of claim 4, wherein the obtaining the timing advance by the target secondary carrier cell during preparation for switching the primary and secondary carriers comprises:
and after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating the time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble.
6. A primary and secondary carrier switching device is arranged in a primary carrier cell and comprises:
a switching judgment module, configured to determine whether primary and secondary carrier switching is required according to a received measurement report of a terminal moving between adjacent carrier aggregation cells;
the switching preparation notification module is used for notifying a target auxiliary carrier cell to carry out main and auxiliary carrier switching preparation when the main and auxiliary carrier switching is determined to be needed;
a time advance acquisition module, configured to receive a time advance obtained from the target secondary carrier cell during preparation for switching primary and secondary carriers;
the switching notification module is used for generating a main carrier switching command carrying the time advance and sending the main carrier switching command to the terminal so that the terminal can complete main carrier switching and auxiliary carrier switching by using the time advance;
after informing the target auxiliary carrier cell to prepare for switching the main carrier and the auxiliary carrier:
the target auxiliary carrier cell distributes a special access preamble to the terminal;
triggering the terminal to perform non-competitive random access to the target secondary carrier cell by using the special access preamble;
after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating a time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble;
after calculating the timing advance, the target secondary carrier cell recovers the dedicated access preamble.
7. A primary and secondary carrier switching device is arranged in a target secondary carrier cell and comprises:
the switching preparation module is used for performing switching preparation of the main carrier and the auxiliary carrier according to a main carrier and auxiliary carrier switching request from a main carrier cell and obtaining a time lead during the switching preparation of the main carrier and the auxiliary carrier;
a time advance sending module, configured to send the time advance to the primary carrier cell, so that the primary carrier cell sends a primary and secondary carrier switching command carrying the time advance to a terminal, and the terminal completes primary and secondary carrier switching by using the time advance;
the handover preparation module is further to:
allocating a dedicated access preamble to the terminal;
triggering the terminal to perform non-competitive random access to the target secondary carrier cell by using the special access preamble;
after the terminal non-competitively and randomly accesses the target secondary carrier cell, calculating a time lead for synchronizing the time between the target secondary carrier cell and the terminal by using the special access preamble;
after calculating the timing advance, the target secondary carrier cell recovers the dedicated access preamble.
8. The apparatus of claim 7, wherein the handover preparation module allocates a dedicated access preamble to the terminal, triggers the terminal to perform non-contention random access to the target secondary carrier cell by using the dedicated access preamble, and calculates a time advance for time synchronization between the target secondary carrier cell and the terminal by using the dedicated access preamble after the terminal performs non-contention random access to the target secondary carrier cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611055161.6A CN108112033B (en) | 2016-11-25 | 2016-11-25 | Method and device for switching primary carrier and secondary carrier |
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| CN201611055161.6A CN108112033B (en) | 2016-11-25 | 2016-11-25 | Method and device for switching primary carrier and secondary carrier |
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| CN108112033A CN108112033A (en) | 2018-06-01 |
| CN108112033B true CN108112033B (en) | 2022-07-08 |
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| WO2020000434A1 (en) * | 2018-06-29 | 2020-01-02 | 华为技术有限公司 | Communication method and apparatus |
| WO2020103106A1 (en) * | 2018-11-22 | 2020-05-28 | 华为技术有限公司 | Inter-system handover method and apparatus |
| CN114006687A (en) * | 2021-01-05 | 2022-02-01 | 中国移动通信有限公司研究院 | A transmission method, an uplink control method, a terminal and a network side device |
| US20240357568A1 (en) * | 2021-07-23 | 2024-10-24 | Beijing Xiaomi Mobile Software Co., Ltd. | Carrier switching method and apparatus, and terminal device and readable storage medium |
| CN113993173B (en) * | 2021-10-25 | 2023-08-29 | 京信网络系统股份有限公司 | Dynamic carrier switching method, device, base station and storage medium |
| CN116264728A (en) * | 2021-12-15 | 2023-06-16 | 华为技术有限公司 | Method for advanced synchronization and communication device |
| CN117460064A (en) * | 2022-07-14 | 2024-01-26 | 华为技术有限公司 | A carrier switching method and device |
| CN119922675A (en) * | 2023-10-31 | 2025-05-02 | 华为技术有限公司 | A communication method and device |
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