CN114845348A - Method for reducing time synchronization wireless network switching time delay - Google Patents
Method for reducing time synchronization wireless network switching time delay Download PDFInfo
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- CN114845348A CN114845348A CN202210745817.6A CN202210745817A CN114845348A CN 114845348 A CN114845348 A CN 114845348A CN 202210745817 A CN202210745817 A CN 202210745817A CN 114845348 A CN114845348 A CN 114845348A
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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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a method for reducing time synchronization wireless network switching time delay, which belongs to the technical field of wireless communication and comprises the steps that a time synchronization wireless network carries out network switching preparation and continues to keep data transmission with a source service base station, a source cell acquires time information sent by a synchronization signal block of a target cell, the time information comprises a synchronization signal block period and offset and synchronization signal block duration, the source cell sends a switching command to a user, the user carries out switching execution, the user carries out switching, the user receives the switching command and hangs up a local data bearer, the local data bearer is synchronized to a new cell, a switching completion signal is sent to the new cell, and the user can carry out data transmission with the target base station after the network switching is completed.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a method for reducing time synchronization wireless network switching delay.
Background
Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting, and typical wireless communication systems may employ multiple access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.), a wireless communication network may include multiple Base Stations (BSs) capable of supporting communication for multiple User Equipments (UEs) that may communicate with the Base Stations (BSs) via downlink and uplink, the downlink (or forward link) referring to the communication link from the BS to the UE, and the uplink (or reverse link) referring to the communication link from the UE to the BS.
At present, in an operator network, a 4G base station and a 5G base station generally adopt GPS synchronization, which are both time synchronization wireless networks, the wireless networks can realize the service continuity of a user in the moving process through a switching function, and the service experience of the user is directly influenced by the switching time delay. Operators also pay attention to data service interruption delay in the switching process, and the switching delay is required to be not more than 70ms, and the switching process comprises switching preparation, switching execution and switching completion. In the stage of switching preparation, the user can continue to maintain data transmission with the source service base station, and in the stage of switching completion, the user can carry out data transmission with the target base station. The handover execution phase is the key to influence the handover delay.
In the prior art, when a source base station sends a handover command, the sending time of a synchronization signal block SSB of a target cell is not considered, which may cause that a user equipment UE needs to wait for a long time to receive a synchronization block when receiving the handover command and then synchronizing with the target cell, thereby increasing the overall handover delay.
Disclosure of Invention
Problems to be solved
The invention provides a method for reducing the switching delay of a time-synchronous wireless network, aiming at the problem that when the existing source base station sends a switching command, the sending time of a synchronous signal block SSB of a target cell is not considered, so that User Equipment (UE) needs to wait for a longer time to receive a synchronous block when the UE is synchronized with the target cell after receiving the switching command, thereby increasing the overall switching delay.
Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for reducing time synchronization wireless network switching time delay adopts the following steps:
step 1: the time synchronization wireless network carries out network switching preparation and continues to maintain data transmission with the source service base station;
step 2: a source cell acquires the sending time information of a synchronous signal block of a target cell;
and step 3: the source cell sends a switching command to a user;
and 4, step 4: the user executes the switching, synchronizes to the new cell and sends a switching completion signal to the new cell;
and 5: after the network switching is completed, the user can perform data transmission with the target base station.
Preferably, the time synchronization wireless network is a system frame number aligned and frame boundary aligned wireless network.
Further, the time synchronization wireless network is composed of a 5G co-frequency networking, a 5G inter-frequency networking and an 5/4G inter-system networking.
Preferably, the time information comprises a synchronization signal block period and offset and a synchronization signal block duration.
Preferably, when the source cell sends the handover command to the user in step 3, it needs to determine whether a difference between a next synchronization signal block time of the destination cell and a current latest downlink time is greater than or equal to a preset time M.
Further, the preset time M is the maximum time consumption and a small amount of time margin for the switching command to be sent to the user side to analyze that the switching command starts to execute synchronization.
Further, if the difference is greater than or equal to the preset time M, a switching command is issued at the downlink time before the next synchronization signal block is subtracted from M.
Further, if the difference is smaller than the preset time M, the switching command is issued in the downlink before the next synchronization signal block is subtracted by M.
Preferably, the user performing handover comprises receiving a handover command and suspending a local data bearer.
Preferably, the alignment of the frame number and the frame boundary is realized by the source cell and the target cell through a GPS.
A method for reducing time synchronization wireless network switching time delay includes carrying out network switching preparation through a time synchronization wireless network, continuing to maintain data transmission with a source service base station, obtaining synchronous signal block sending time information of a target cell by a source cell, enabling time information to include synchronous signal block period and deviation and synchronous signal block duration, enabling the source cell to send a switching command to a user, enabling the user to be synchronized to a new cell, sending a switching completion signal to the new cell, carrying out switching execution by the user, enabling the user to receive the switching command and hang up local data bearing and synchronize to the new cell, enabling the user to carry out data transmission with the target base station after network switching is completed, and effectively reducing switching time delay of the time synchronization wireless network.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention divides the switching process into three stages of switching preparation, switching execution and switching completion, the user can continue to keep data transmission with the source service base station in the switching preparation stage, the switching execution stage is divided into receiving a switching command and suspending local data bearing, and the user can carry out data transmission with the target base station in the switching completion stage, thereby reducing the influence of the switching execution stage on the switching delay;
(2) when the switching command is sent, the sending time of the synchronous signal block of the target cell is considered, and when the user equipment receives the switching command and then goes to the target cell for synchronization, the user equipment does not need to wait for a long time to receive the synchronous block, so that the overall switching time delay is reduced;
(3) when the source cell sends the switching command to the user, the method judges whether the difference value between the next synchronous signal block time of the target cell and the current nearest downlink time is larger than or equal to the preset time quantum, the preset time quantum is the maximum time consumption and a small amount of time margin for the switching command to be sent to the user equipment to analyze that the switching command starts to execute synchronization, and the switching time delay of the time synchronization wireless network is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present application, the drawings needed to be used in the embodiments or exemplary descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application and therefore should not be considered as limiting the scope, and it is also possible for those skilled in the art to obtain other drawings according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the steps of a method for reducing the time delay for switching a time-synchronized wireless network;
fig. 2 is a flowchart illustrating a method for reducing a handover delay of a time-synchronized wireless network.
Detailed Description
To further clarify the objects, technical solutions and advantages of the embodiments of the present application, the embodiments of the present application will be described in detail and completely with reference to the accompanying drawings of the embodiments of the present application, it should be understood that the embodiments described are a part of the embodiments of the present application and not all of the embodiments, and that the components of the embodiments of the present application generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.
Therefore, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application, and all other embodiments that can be derived by one of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of the claimed application.
Example 1
As shown in fig. 1, a method for reducing the time delay of time-synchronized wireless network handover includes the following steps:
and the time synchronization wireless network carries out network switching preparation and continues to maintain data transmission with the source service base station, the time synchronization wireless network is a wireless network with aligned system frame numbers and aligned frame boundaries, and the time synchronization wireless network consists of 5G co-frequency networking, 5G inter-frequency networking and 5/4G inter-system networking.
The source cell acquires the sending time information of the synchronous signal block of the target cell, the time information comprises the period and the offset of the synchronous signal block and the duration of the synchronous signal block, and the alignment of the frame number and the frame boundary is realized by the source cell and the target cell through a GPS.
The method comprises the steps that a source cell sends a switching command to a user, the user synchronizes to a new cell, a switching completion signal is sent to the new cell, when the source cell sends the switching command to the user, whether the difference value between the next synchronization signal block time of a target cell and the current latest downlink time is larger than or equal to a preset time M needs to be judged, the preset time M is the maximum consumed time and a small amount of time allowance for the switching command to start to execute synchronization when the switching command is sent to a user side, and if the difference value is larger than or equal to the preset time M, the switching command is issued at the downlink time before the next synchronization signal block is reduced by M.
The user performs switching execution and synchronizes to a new cell, the user performs switching including receiving a switching command and suspending a local data bearer, and after network switching is completed, the user can perform data transmission with a target base station.
As can be seen from the above description, in this example, the time-synchronized wireless network performs network handover preparation, continues to maintain data transmission with the source serving base station, the source cell acquires the synchronization signal block transmission time information of the target cell, the time information includes the synchronization signal block period and offset and the synchronization signal block duration, the source cell transmits a handover command to the user, the user performs handover execution includes receiving the handover command and suspending local data bearer, the user synchronizes to a new cell and transmits a handover completion signal to the new cell, after the network handover is completed, the user can perform data transmission with the target base station, and handover delay of the time-synchronized wireless network is effectively reduced.
Example 2
A method for reducing time synchronization wireless network switching time delay adopts the following steps:
and the time synchronization wireless network carries out network switching preparation and continues to maintain data transmission with the source service base station, the time synchronization wireless network is a wireless network with aligned system frame numbers and aligned frame boundaries, and the time synchronization wireless network consists of 5G co-frequency networking, 5G inter-frequency networking and 5/4G inter-system networking.
The source cell acquires the sending time information of the synchronous signal block of the target cell, the time information comprises the period and the offset of the synchronous signal block and the duration of the synchronous signal block, and the alignment of the frame number and the frame boundary is realized by the source cell and the target cell through a GPS.
The method comprises the steps that a source cell sends a switching command to a user, the user synchronizes to a new cell, a switching completion signal is sent to the new cell, when the source cell sends the switching command to the user, whether the difference value between the next synchronization signal block time of a target cell and the current latest downlink time is larger than or equal to a preset time M needs to be judged, the preset time M is the maximum consumed time and a small amount of time allowance for the switching command to start to execute synchronization when the switching command is sent to a user side, and if the difference value is smaller than the preset time M, the switching command is issued in a downlink mode before the next synchronization signal block is reduced by M.
And the user performs switching execution and synchronizes to a new cell, the user performs switching including receiving a switching command and suspending local data bearer, and after network switching is completed, the user can perform data transmission with a target base station.
As can be seen from the above description, in this example, the time-synchronized wireless network performs network handover preparation, continues to maintain data transmission with the source serving base station, the source cell acquires the synchronization signal block transmission time information of the target cell, the time information includes the synchronization signal block period and offset and the synchronization signal block duration, the source cell transmits a handover command to the user, the user performs handover execution includes receiving the handover command and suspending local data bearer, the user synchronizes to a new cell and transmits a handover completion signal to the new cell, after the network handover is completed, the user can perform data transmission with the target base station, and handover delay of the time-synchronized wireless network is effectively reduced.
Example 3
Cell 1 and cell 2 both work in 3540MHz frequency band, TDD disposes DDDSUDDSUU, two cells realize frame number and frame boundary alignment through GPS, the SMTC information of cell 2 is: the period is 160ms, the offset is 0, the duration is 5ms, the maximum time of the handover command sent to the UE to analyze that the handover command starts to execute synchronization is 4ms, and if a small amount of time margin is 1, M =5 ms.
The user equipment UE1 is handed over at time SFN159subframe0, and since the difference between the next synchronization signal block SSB time SFN160 and the current time is equal to 10ms, which is greater than M, cell 1 will send a handover command to the user equipment UE1 at SFN159subframe3slot 1.
The UE2 is handed over at the time SFN159subframe6, and since the difference between the next synchronization signal block SSB time SFN160 and the current time is 4ms, which is smaller than M, cell 1 will send a handover command to the UE1 at SFN319subframe3slot 1.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention.
Claims (10)
1. A method for reducing time synchronization wireless network switching time delay is characterized by comprising the following steps:
step 1: the time synchronization wireless network carries out network switching preparation and continues to maintain data transmission with the source service base station;
step 2: a source cell acquires the sending time information of a synchronous signal block of a target cell;
and step 3: the source cell sends a switching command to a user;
and 4, step 4: the user executes the switching, synchronizes to the new cell and sends a switching completion signal to the new cell;
and 5: after the network switching is completed, the user can perform data transmission with the target base station.
2. The method of claim 1, wherein the method further comprises the step of: the time synchronization wireless network is a wireless network with system frame number alignment and frame boundary alignment.
3. The method of claim 2, wherein the step of reducing the handover delay of the time-synchronized wireless network comprises: the time synchronization wireless network consists of a 5G co-frequency networking, a 5G different-frequency networking and an 5/4G different-system networking.
4. The method of claim 1, wherein the method further comprises the step of: the time information includes a synchronization signal block period and offset and a synchronization signal block duration.
5. The method of claim 1, wherein the method further comprises the step of: when the source cell sends the handover command to the user in step 3, it needs to determine whether the difference between the next synchronization signal block time of the target cell and the current latest downlink time is greater than or equal to the preset time M.
6. The method of claim 5, wherein the step of reducing the handover delay of the time-synchronized wireless network comprises: the preset time M is the maximum time consumption and a small amount of time margin for the switching command to be sent to the user side to analyze and execute the synchronization of the switching command.
7. The method of claim 5, wherein the step of reducing the handover delay of the time-synchronized wireless network comprises: and if the difference is greater than or equal to the preset time M, issuing a switching command at the downlink moment before the next synchronous signal block is subtracted from M.
8. The method of claim 5, wherein the step of reducing the handover delay of the time-synchronized wireless network comprises: and if the difference value is smaller than the preset time M, the downlink sends a switching command before the next synchronization signal block is subtracted by M.
9. The method of claim 1, wherein the method further comprises the step of: the user performing a handover includes receiving a handover command and suspending a local data bearer.
10. The method of claim 1, wherein the method further comprises the step of: and the source cell and the target cell realize the alignment of the frame number and the frame boundary through the GPS.
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Address after: 518000 Room 101, building C4, Zone C, Fuhai international science and Technology Park, Zhancheng community, Fuhai street, Bao'an District, Shenzhen, Guangdong Province Patentee after: Shenzhen Jiaxian Communication Technology Co.,Ltd. Address before: 518103 Room 101, building C4, Zone C, Fuhai international science and Technology Park, Zhancheng community, Fuhai street, Bao'an District, Shenzhen, Guangdong Province Patentee before: Shenzhen Jiaxian communication equipment Co.,Ltd. |