CN113055955A - Switching control device and method - Google Patents
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- CN113055955A CN113055955A CN202110262913.0A CN202110262913A CN113055955A CN 113055955 A CN113055955 A CN 113055955A CN 202110262913 A CN202110262913 A CN 202110262913A CN 113055955 A CN113055955 A CN 113055955A
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- 238000004891 communication Methods 0.000 claims abstract description 157
- 238000005259 measurement Methods 0.000 claims abstract description 71
- 238000012790 confirmation Methods 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000012545 processing Methods 0.000 claims description 28
- 238000013468 resource allocation Methods 0.000 claims description 3
- 238000007726 management method Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
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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
- H04W36/0005—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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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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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Abstract
The invention discloses a switching control device and a switching control method. The terminal is provided with a main control module and two communication modules. The main process comprises the following steps: the second communication module measures the adjacent base station and transmits the measurement result to the first communication module through the main control module while the first communication module transmits data with the source base station; the first communication module sends a measurement report to a source base station, and the source base station sends a switching message to the terminal if the source base station judges that the terminal meets the switching condition after receiving the measurement report; the second communication module is accessed to the target base station according to the configuration of the switching message and sends a switching completion message to the target base station; and the second communication module receives the switching completion confirmation message and then informs the main control module, and then the main control module informs the first communication module to release the link with the source base station and simultaneously transfers the service data channel to the second communication module, so that the switching process is completed. The switching control method of the invention can ensure that the terminal can continuously transmit the service data when switching occurs.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a handover control apparatus and method.
Background
For mobile communication systems, handover is an essential function to ensure the continuity of the terminal service, because the coverage of the base stations is limited, and as the terminal moves, it inevitably results in a transition from the coverage of one base station to the coverage of another base station, which triggers handover. In the modern times, with continuous innovation of high-speed vehicles, terminal switching becomes more and more frequent, and a good switching scheme brings better experience to users.
The existing switching scheme used by the ground mobile communication system generally belongs to hard switching, that is, if switching occurs in the service process, a terminal needs to release an original communication link first, and continues service data transmission after establishing a new communication link with a switched target base station, taking LTE (long term evolution) as an example, the terminal in the service process sends a measurement report to the base station, the base station may find a base station with better signal condition for the terminal according to the measurement report, and then the base station sends a radio bearer reconfiguration message (including a switching indication) to the terminal, and the terminal immediately stops service data transmission and releases the link after receiving the message, and starts to access another base station according to the switching indication, and can not continue data transmission until the access is successful.
The hard handoff method makes the terminal unable to keep the transmission of the service data during handoff, affects the service rate, and is not suitable for some scenes with high requirement on the continuity of data transmission.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a handover control apparatus and method, so as to solve the problem that the existing terminal cannot maintain data transmission when handover occurs between base stations.
In order to solve the problems, the invention adopts the technical scheme that:
a switching control device comprises two communication modules and a main control module, wherein one of the two communication modules is used as a service processing module, and the other communication module is used as a measuring module;
the service processing module is used for carrying out normal service data transmission with the source base station; the system is also used for receiving the measurement result sent by the measurement module, sending a measurement report to the source base station according to a set rule, waiting for receiving the switching message sent by the source base station, analyzing the resource configuration information and sending the resource configuration information to the main control module after receiving the switching message, releasing the resource after receiving the message of the main control module and the link between the source base stations, and converting the resource into the measurement module;
the measurement module is used for measuring the signal intensity of the adjacent base station and transmitting the measurement result to the service processing module through the main control module; the system is also used for carrying out resource allocation according to the main control module, stopping measurement after the allocation is finished, starting to access the target base station, sending a switching completion message to the target base station after the target base station is accessed, waiting for receiving a switching completion confirmation message sent by the target base station, notifying the first communication module to release a link between the first communication module and the source base station through the main control module after receiving the switching completion confirmation message, and converting the link into a service processing module;
the main control module is used for selecting two communication modules as a service processing module and a measuring module respectively, and storing and managing related information in the running process; and the system is also used for data forwarding between the service processing module and the measurement module, configuring the second communication module after receiving the resource configuration information of the service processing module, informing the second communication module to stop measurement, and starting to access the target base station.
A switching control method is realized based on the switching control device, the switching control device is arranged at a terminal, and the switching control method specifically comprises the following steps:
(1) the first communication module and the source base station carry out normal service data transmission, and simultaneously the second communication module measures the signal intensity of the adjacent base station, wherein the first communication module is used as a service processing module, and the second communication module is used as a measuring module;
(2) the second communication module transmits the measurement result to the first communication module through the main control module;
(3) the first communication module sends a measurement report to the source base station according to a set rule and waits for receiving a switching message sent by the source base station;
(4) after receiving the measurement report, the source base station requests resources from the target base station and sends a switching message to the terminal if the terminal is judged to meet the switching condition; the switching message comprises target base station public control information and resource configuration information;
(5) the first communication module receives the switching message, analyzes the resource configuration information and sends the resource configuration information to the main control module, and the main control module configures the second communication module according to the resource configuration information, informs the second communication module to stop measurement and starts to access the target base station;
(6) after the second communication module and the target base station finish synchronization and access the target base station, sending a switching completion message to the target base station and waiting for receiving a switching completion confirmation message sent by the target base station;
(7) after receiving the switching completion message of the terminal, the target base station sends a switching completion confirmation message to the terminal;
(8) the second communication module receives the switching completion confirmation message and then informs the main control module, and the main control module informs the first communication module to release a link between the first communication module and the source base station and simultaneously transfers a service data channel to the second communication module;
(9) the first communication module sends a release request message to the source base station, then releases resources, and simultaneously the second communication module starts to transmit service data with the target base station;
(10) after the first communication module resource is released, the broadcast message of the target base station is received, and then the signal strength measurement of the adjacent base station of the target base station is started, at this moment, the second communication module is used as a service processing module, and the first communication module is used as a measurement module.
Before the second communication module receives the switching completion confirmation message sent by the target base station, the first communication module keeps the service data transmission with the source base station.
Wherein, the source base station keeps transmitting the service data with the terminal until receiving the release request message.
Compared with the prior art, the invention has the following advantages:
the invention introduces the dual communication module in the terminal device, and the switching control method provided by the invention can ensure that the terminal can maintain the transmission of service data when the terminal is switched, improves the receiving and sending efficiency and the resource utilization rate, and provides a feasible scheme for some time delay or jitter sensitive application scenes.
Drawings
Fig. 1 is a schematic structural diagram of a switching control apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a handover control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a scheme of data transmission in a handover control method according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the terminal device of the present invention is composed of two communication modules, and further includes a main control module, where the first communication module is used as a service processing module and the second communication module is used as a measurement module at the beginning of this embodiment.
The service processing module is used for carrying out normal service data transmission with the source base station; the system is also used for receiving the measurement result sent by the measurement module, sending a measurement report to the source base station according to a set rule, waiting for receiving the switching message sent by the source base station, analyzing the resource configuration information and sending the resource configuration information to the main control module after receiving the switching message, releasing the resource after receiving the message of the main control module and the link between the source base stations, and converting the resource into the measurement module;
the measurement module is used for measuring the signal intensity of the adjacent base station and transmitting the measurement result to the service processing module through the main control module; the system is also used for carrying out resource allocation according to the main control module, stopping measurement after the allocation is finished, starting to access the target base station, sending a switching completion message to the target base station after the target base station is accessed, waiting for receiving a switching completion confirmation message sent by the target base station, notifying the first communication module to release a link between the first communication module and the source base station through the main control module after receiving the switching completion confirmation message, and converting the link into a service processing module;
the main control module is responsible for service data transmission between the terminal application layer and the communication module, and can determine which communication module the terminal application layer data is sent out through and forward the application layer service data received by the communication module to the upper layer. The context management function is used for storing and managing the state, variable, channel configuration of each module in the terminal operation process, base station related information reported by the communication module and the like. The configuration and management and control function is responsible for configuring and releasing channels of the communication module, managing normal operation of the communication module, instructing the communication module to measure, stop measuring, read broadcast messages and the like. The message processing and forwarding function is mainly used to communicate two communication modules, and can implement information transmission and sharing between the two modules, for example, one module obtains a measurement result and forwards the measurement result to the other module.
As shown in fig. 2, an embodiment of the present invention provides a handover control method. The first communication module is used as a service processing module, an application layer data transmission channel is established between the first communication module and the main control module, and in addition, the first communication module establishes and maintains a communication link with a base station (namely a source base station) which is accessed by the current terminal and is carrying out service transmission. The second communication module is used as a measurement module and can measure the signal intensity of the adjacent base station of the currently accessed source base station, and the measurement result is transmitted to the first communication module through the message forwarding function of the main control module. The first communication module determines a sending rule of a measurement report according to a broadcast message and measurement report configuration issued by a network side, when the measurement report forwarded by the main control module is received, the first communication module can determine whether to send the measurement report according to a configured criterion, for example, the criterion specifies that the signal strength of an adjacent base station is higher than 5dB of the base station, the measurement report is triggered when the signal strength of the adjacent base station is specified by the criterion, the measurement result received by the first communication module is-90 dBm of the base station, and a certain adjacent base station is-84 dBm, at this time, the first communication module should judge to trigger the measurement report, wherein the measurement report comprises various measurement results, and the first communication module sends the measurement report to a source base station in a current. After receiving the measurement report of the terminal, the source base station also judges whether the switching should be initiated according to the corresponding criteria, if the switching is initiated, the source base station requests resources to the target base station, then the source base station sends a switching message to the terminal through a communication link between the source base station and the first communication module, and the switching message should include the identification of the switched target base station, the random access related information of the target base station, the service channel resources distributed by the target base station and the like. It should be noted that, after the handover message is sent, the source base station still maintains the original communication link and data transmission with the terminal, and continues to transmit the application layer data with the core network.
After receiving the switching message, the first communication module analyzes the configuration information and sends the configuration information to the main control module, and requests the main control module to configure the second communication module; the main control module stores the configuration information into a context through a context management function after receiving the message, and after the message is processed, the main control module requests the second communication module to stop measurement, configures the relevant information of the target base station in the context to the second communication module, and instructs the second communication module to initiate the access of the target base station. The second communication module starts to initiate random access after synchronizing with the target base station, the second communication module is switched to the channel resource of the target base station configured by the main control module after the random access is successful, at the moment, communication links are simultaneously established between the two communication modules of the terminal and the source base station and the target base station, the first communication module and the source base station still keep service data transmission, and the second communication module and the target base station transmit switching signaling, which is specifically shown below. For a conventional single communication module terminal, when a handover occurs, the module must stop data transmission with a source base station, and can continue the previous service data transmission after synchronization, random access, and channel handover to a target base station. The switching control method of the invention leads one link to keep service data transmission when switching occurs by introducing the dual communication module, thus being capable of ensuring the realization of lossless and seamless switching. After a communication link is established between the second communication module and the target base station, a switching completion message is sent on the link, the target base station replies a confirmation after receiving the switching completion message, the second communication module notifies the main control module after receiving the switching completion confirmation message, and the main control module instructs the first communication module to initiate link release with the source base station after message processing and switches an application layer data channel to the second communication module. And then the service data is transmitted through a link between the second communication module and the target base station. It should be noted that, after the target base station sends the handover completion confirmation message to the terminal, the target base station needs to notify the source base station, and after receiving the message, the source base station should terminate the application data transmission with the terminal and the core network, and forward the unsent uplink and downlink service data to the target base station, and the target base station continues to complete the sending. The first communication module starts to read the broadcast message of the target base station and forwards the broadcast message to the second communication module through the main control module after releasing the link and returning to an idle state, the second communication module stores the broadcast message to the context of the main control module after analyzing the broadcast message, the main control module configures necessary information to the first communication module, for example, adjacent base station information, measurement and switching related information of the target base station, and the first communication module can start adjacent base station signal strength measurement after obtaining the information. So far, the first communication module and the second communication module complete the role switching through switching, the first communication module becomes a measurement module, the second communication module becomes a service processing module, and the subsequent processes are performed in a circulating manner as described above.
The method comprises the following specific steps:
(1) the first communication module and the source base station carry out normal service data transmission, and simultaneously the second communication module measures the signal intensity of the adjacent base station, wherein the first communication module is used as a service processing module, and the second communication module is used as a measuring module;
(2) the second communication module transmits the measurement result to the first communication module through the main control module;
(3) the first communication module determines a sending rule of the measurement report according to the broadcast message and the measurement report configuration issued by the network side, judges whether to send the measurement report according to the configured sending rule when receiving the measurement result forwarded by the main control module, and waits for receiving the switching message sent by the source base station;
(4) after receiving the measurement report, the source base station requests resources from the target base station and sends a switching message to the terminal if the terminal is judged to meet the switching condition; the switching message comprises target base station public control information and resource configuration information;
(5) the first communication module receives the switching message, analyzes the resource configuration information and sends the resource configuration information to the main control module, and the main control module configures the second communication module according to the resource configuration information, informs the second communication module to stop measurement and starts to access the target base station;
(6) after the second communication module and the target base station finish synchronization and access the target base station, sending a switching completion message to the target base station and waiting for receiving a switching completion confirmation message sent by the target base station;
(7) after receiving the switching completion message of the terminal, the target base station sends a switching completion confirmation message to the terminal;
(8) the second communication module receives the switching completion confirmation message and then informs the main control module, and the main control module informs the first communication module to release a link between the first communication module and the source base station and simultaneously transfers a service data channel to the second communication module;
(9) the first communication module sends a release request message to the source base station, then releases resources, and simultaneously the second communication module starts to transmit service data with the target base station;
(10) after the first communication module resource is released, the broadcast message of the target base station is received, and then the signal strength measurement of the adjacent base station of the target base station is started, at this moment, the second communication module is used as a service processing module, and the first communication module is used as a measurement module.
Before the second communication module receives a switching completion confirmation message sent by the target base station, the first communication module keeps service data transmission with the source base station; the source base station maintains service data transmission with the terminal until receiving the release request message.
Fig. 3 illustrates a handover control method of the present invention. In the uplink direction, the terminal waits for transmission of data blocks with sequence numbers 5, 6, 7, 8, 9, 10, etc., and before initiating handover, the terminal transmits the data blocks with sequence numbers 5, 6 to the source base station, and the base station delivers the data blocks to the core network in sequence. When the switching is started, that is, the terminal receives the switching message sent by the source base station, the communication module with the sequence number of 5, 6 data blocks is sent by the terminal to continue to maintain the link with the source base station, another communication module of the terminal starts to access the target base station to establish a communication link and performs the transmission of signaling such as switching completion and the like with the target base station, at this moment, two communication links are respectively established between the terminal and the source base station and between the terminal and the target base station, and the state lasts until the switching process is finished, that is, the transmission of the switching related signaling is successful and the communication link with the source base station is released. By applying the handover control method and apparatus of the present invention, the terminal can continue to transmit service data during the handover process, i.e. the period from the start of handover to the end of handover, such as the transmission of data blocks with sequence numbers 7 and 8 shown in 301 in fig. 3, in order to implement the handover control method of the present invention, the base station also maintains two communication links with the terminal during the handover process, and can still deliver the service data of the terminal to the core network in sequence after receiving the service data of the terminal during the handover process, as shown in 302 in fig. 3, for the data which cannot be delivered in sequence, the data is forwarded to the target base station after the handover is completed, and the terminal and the target base station continue to transmit data blocks with sequence numbers 9, 10, 11 and subsequent data blocks after the handover is. In the downlink direction, the source base station may continuously receive and send the service data sent by the core network to the terminal in the handover process, as shown in 303 and 304 in fig. 3, the source base station sends the data blocks with sequence numbers 1 and 2 to the terminal, and because there are two communication links, the terminal may also receive and process the downlink data blocks with sequence numbers 1 and 2 in the handover process. After the switching is finished, the core network continuously sends the serial numbers 3 and 4 and the subsequent downlink data blocks to the terminal through the target base station, and at the moment, the link between the terminal and the source base station is released.
In this example, if a conventional handover method is adopted, the terminal needs to release the link with the source base station during the handover process, and cannot continue to transmit the service data until the handover is completed, such as the data blocks with sequence numbers 7 and 8 of the uplink and the data blocks with sequence numbers 1 and 2 of the downlink in fig. 3.
In summary, it can be seen that the handover control method and apparatus provided by the present invention can effectively utilize time resources in the handover process, so that a communication link always exists between the terminal and the base station to transmit service data, thereby implementing a seamless and lossless handover process.
Claims (4)
1. A switching control device is characterized by comprising two communication modules and a main control module, wherein one of the two communication modules is used as a service processing module, and the other communication module is used as a measuring module;
the service processing module is used for carrying out normal service data transmission with the source base station; the system is also used for receiving the measurement result sent by the measurement module, sending a measurement report to the source base station according to a set rule, waiting for receiving the switching message sent by the source base station, analyzing the resource configuration information and sending the resource configuration information to the main control module after receiving the switching message, releasing the resource after receiving the message of the main control module and the link between the source base stations, and converting the resource into the measurement module;
the measurement module is used for measuring the signal intensity of the adjacent base station and transmitting the measurement result to the service processing module through the main control module; the system is also used for carrying out resource allocation according to the main control module, stopping measurement after the allocation is finished, starting to access the target base station, sending a switching completion message to the target base station after the target base station is accessed, waiting for receiving a switching completion confirmation message sent by the target base station, notifying the first communication module to release a link between the first communication module and the source base station through the main control module after receiving the switching completion confirmation message, and converting the link into a service processing module;
the main control module is used for selecting two communication modules as a service processing module and a measuring module respectively, and storing and managing related information in the running process; and the system is also used for data forwarding between the service processing module and the measurement module, configuring the second communication module after receiving the resource configuration information of the service processing module, informing the second communication module to stop measurement, and starting to access the target base station.
2. A handover control method, which is implemented by the handover control apparatus of claim 1, the handover control apparatus being provided at a terminal, and the method comprising the following steps:
(1) the first communication module and the source base station carry out normal service data transmission, and simultaneously the second communication module measures the signal intensity of the adjacent base station, wherein the first communication module is used as a service processing module, and the second communication module is used as a measuring module;
(2) the second communication module transmits the measurement result to the first communication module through the main control module;
(3) the first communication module sends a measurement report to the source base station according to a set rule and waits for receiving a switching message sent by the source base station;
(4) after receiving the measurement report, the source base station requests resources from the target base station and sends a switching message to the terminal if the terminal is judged to meet the switching condition; the switching message comprises target base station public control information and resource configuration information;
(5) the first communication module receives the switching message, analyzes the resource configuration information and sends the resource configuration information to the main control module, and the main control module configures the second communication module according to the resource configuration information, informs the second communication module to stop measurement and starts to access the target base station;
(6) after the second communication module and the target base station finish synchronization and access the target base station, sending a switching completion message to the target base station and waiting for receiving a switching completion confirmation message sent by the target base station;
(7) after receiving the switching completion message of the terminal, the target base station sends a switching completion confirmation message to the terminal;
(8) the second communication module receives the switching completion confirmation message and then informs the main control module, and the main control module informs the first communication module to release a link between the first communication module and the source base station and simultaneously transfers a service data channel to the second communication module;
(9) the first communication module sends a release request message to the source base station, then releases resources, and simultaneously the second communication module starts to transmit service data with the target base station;
(10) after the first communication module resource is released, the broadcast message of the target base station is received, and then the signal strength measurement of the adjacent base station of the target base station is started, at this moment, the second communication module is used as a service processing module, and the first communication module is used as a measurement module.
3. The handover control method of claim 2, wherein the first communication module maintains traffic data transmission with the source base station until the second communication module receives the handover complete confirmation message sent by the target base station.
4. The handover control method of claim 2, wherein the source base station maintains traffic data transmission with the terminal until receiving the release request message.
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| CN113596946A (en) * | 2021-07-19 | 2021-11-02 | 西安广和通无线软件有限公司 | Wireless communication method, wireless communication terminal, and storage medium |
| CN113596946B (en) * | 2021-07-19 | 2024-04-05 | 西安广和通无线软件有限公司 | Wireless communication method, wireless communication terminal, and storage medium |
| CN116419360A (en) * | 2023-06-06 | 2023-07-11 | 成都爱瑞无线科技有限公司 | Mobility management method, device and storage medium of general sense integrated system |
| CN116419360B (en) * | 2023-06-06 | 2023-09-19 | 成都爱瑞无线科技有限公司 | Mobility management method, device and storage medium of general sense integrated system |
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Application publication date: 20210629 |