CN111212452B - Handover method for voice communication, communication system, terminal and storage medium - Google Patents
Handover method for voice communication, communication system, terminal and storage medium Download PDFInfo
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- CN111212452B CN111212452B CN202010033030.8A CN202010033030A CN111212452B CN 111212452 B CN111212452 B CN 111212452B CN 202010033030 A CN202010033030 A CN 202010033030A CN 111212452 B CN111212452 B CN 111212452B
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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
- H04W36/00837—Determination of triggering parameters for hand-off
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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
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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 handover method of voice communication, a communication system, a terminal and a storage medium. The handover method of voice communication includes: when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe; the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking; if yes, switching from the current channel to a target channel; receiving the synchronous signal frame, and completing the time slot synchronization and the time slot locking by utilizing the synchronous signal frame; continuing to receive the speech frames over the target channel. By the method, the invention can quickly complete the handover in the voice communication process and reduce the loss of voice.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a communication system, a terminal, and a storage medium for performing handover in voice communication.
Background
In private network communication, the private network is covered by multiple base station areas, and a communication terminal usually moves from one base station coverage area to another base station coverage area in the process of communication, so that smooth communication switching is ensured in the process of communication terminal handover, and voice data of a user is lost as little as possible in the switching process.
For example, in a digital private network TDMA (Time Division Multiple Access) system, a plurality of processes such as channel switching, synchronization detection, slot locking, and voice synchronization are required to be performed during a call handover, and these processes consume Time, so that voice may be lost. In the existing handover, when it is detected that the handover condition is satisfied, channel switching is immediately performed, and after the channel switching, synchronization word detection and time slot calibration locking are required. After the locking is completed, the playing voice can be continuously received from the voice A frame. The voice superframe is numbered by six frame cycles, identified in turn as A, B, C, D, E, F, so that 360ms of voice may be lost in the worst case.
Disclosure of Invention
The technical problem mainly solved by the invention is to provide a handover method, a communication system, a terminal and a storage medium for voice communication, which can quickly complete handover in the voice communication process and reduce voice loss.
In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a handover method for voice communication, including: when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe; the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking; if yes, switching from the current channel to a target channel; receiving the synchronous signal frame, and completing the time slot synchronization and the time slot locking by utilizing the synchronous signal frame; continuing to receive the speech frames over the target channel.
In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a time division multiple access communication system, including: at least two base stations, each base station having a communication coverage area; the at least two communication terminals realize voice communication through the at least two base stations; each of said communication terminals is operable to implement a method as described above.
In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a communication terminal, including a communication circuit, a memory and a processor coupled to each other; the communication circuit is used for communicating with other terminals; the memory is used for storing program data; the processor executes the program data for implementing the method as described above.
In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a computer-readable storage medium storing program data capable of being executed by a processor, the program data being executable to implement the method as described above.
The invention has the beneficial effects that: different from the situation of the prior art, when the communication terminal determines that the communication terminal meets the handover condition, the method detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe, wherein the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking; if the voice frame is specific, switching from the current channel to a target channel, receiving a synchronous signal frame after switching to the target channel, completing time slot synchronization and time slot locking by utilizing the synchronous signal frame, and then continuously receiving the voice frame through the target channel. By the mode, when the communication terminal needs to perform handover in the voice receiving process, the communication terminal selects to perform channel switching after receiving a specific voice frame, and because the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking, the synchronous signal frame can be received in time after the channel switching to perform time slot synchronization and time slot locking, thereby rapidly completing the handover and reducing the voice loss.
Drawings
Fig. 1 is a flowchart illustrating a first embodiment of a handoff method for voice communication according to the present invention;
fig. 2 is a flowchart illustrating a handoff method for voice communication according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a received voice frame during a handover process in a first application scenario of the handover method for voice communication according to the present invention;
fig. 4 is a schematic diagram of a received voice frame during a handover process in a second application scenario of the handover method for voice communication according to the present invention;
FIG. 5 is a schematic diagram of a detailed flowchart of an embodiment of step S205 in FIG. 2;
fig. 6 is a schematic diagram illustrating the principle of recovering a lost speech frame during handover in a third application scenario of the handover method of speech communication according to the present invention;
FIG. 7 is a schematic diagram of a detailed flowchart of another embodiment of step S205 in FIG. 2;
fig. 8 is a schematic diagram illustrating the principle of removing repeated speech frames during handoff in a fourth application scenario of the handoff method for speech communication according to the present invention;
fig. 9a to 9d are schematic diagrams illustrating the effect of voice reception in a sixth application scenario of the handoff method of voice communication according to the present invention;
fig. 10 is a schematic structural diagram of an embodiment of a tdma communication system according to the present invention;
fig. 11 is a schematic structural diagram of an embodiment of a communication terminal provided in the present invention;
fig. 12 is a schematic structural diagram of an embodiment of a computer-readable storage medium provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The communication establishing method based on the time division multiple access communication system provided by the invention can be suitable for the communication system adopting the time division multiple access technology, such as: police trunking system, Digital Mobile Radio (DMR), terrestrial Trunked Radio (TETRA), and the like. Referring to fig. 1, fig. 1 is a flowchart illustrating a method for performing a handoff of voice communication according to a first embodiment of the present invention. The handover method of voice communication in the present embodiment includes the steps of:
s101: when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe; wherein the transmission time from a specific voice frame to the next synchronization signal frame is greater than or equal to the time for completing the slot synchronization and slot locking. If the specific voice frame is not the specific voice frame, the step S102 is executed, and if the specific voice frame is not the specific voice frame, the voice frame continues to be received until the specific voice frame is received, and then the step S102 is executed.
S102: switching from the current channel to the target channel.
Channel switching, i.e., handover, is required to maintain uninterrupted communication for a user as the communication terminal moves from the coverage of one base station to the coverage of another. In a time division multiple access communication system, a communication terminal performs normal communication according to an embedded signaling frame sent by a base station by receiving the embedded signaling frame, and when the communication terminal performs voice communication, the embedded signaling frame is a voice embedded signaling frame, which is also called a voice superframe. In general handover, when it is detected that a handover condition is satisfied, the communication terminal immediately performs channel switching, and since sync word detection and time slot calibration locking are performed after channel switching and voice playing is started after the locking is completed, the handover process is long, voice loss is large, and user communication content loss may be caused, which results in poor user experience. Therefore, when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal can detect whether the voice frame received through the current channel is a specific voice frame in a voice superframe, if so, the communication terminal is switched from the current channel to a target channel, and if not, the communication terminal continues to receive the voice frame through the current channel until the specific voice frame is received and then is switched from the current channel to the target channel.
S103: and receiving a synchronous signal frame, and completing time slot synchronization and time slot locking by using the synchronous signal frame.
It can be understood that, after the communication terminal is switched from the current channel to the target channel, the physical layer does not upload data to the link layer until the synchronization signal frame is not detected, and only after the synchronization signal frame is detected, the physical layer transmits the received data to the link layer for processing, and the communication terminal can receive the voice frame through the target channel.
S104: the speech frames continue to be received over the target channel.
Since the communication terminal aligns the time slots by the synchronization signal frame and completes the time slot locking after switching from the current channel to the target channel, it can continue to receive the voice frame through the target channel and complete the handover.
In the embodiment, when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received through the current channel is a specific voice frame in a voice superframe, wherein the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking; if the voice frame is specific, switching from the current channel to a target channel, receiving a synchronous signal frame after switching to the target channel, completing time slot synchronization and time slot locking by utilizing the synchronous signal frame, and then continuously receiving the voice frame through the target channel. By the mode, when the communication terminal needs to perform handover in the voice receiving process, the communication terminal selects to perform channel switching after receiving a specific voice frame, and as the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking, the synchronous signal frame can be received in time after the channel switching so as to perform time slot synchronization and time slot locking, thereby rapidly completing the handover, ensuring that the voice frame can be received as soon as possible after the handover, reducing the loss of voice and achieving smooth handover.
It can be understood that in the DMR system, the structure of the voice superframe may be different, and as an implementation, the voice superframe is composed of 6 voice frames, which are sequentially a voice frame a, a voice frame B, a voice frame C, a voice frame D, a voice frame E, and a voice frame F, where the voice frame a is the start of the voice superframe and has a SYNC word SYNC as a SYNC signal frame. Therefore, when the communication terminal switches channels, it is necessary to find the speech frame a with the SYNC word SYNC before it can start receiving the speech frame B, the speech frame C, the speech frame D, the speech frame E, and the speech frame F and play the speech. The channel switching is not performed after the specific voice frame is received, so that the channel switching, the synchronous word detection and the time slot locking are required to be completed within the period from the time when the specific voice frame is received to the time when the voice frame A is received, and the network delay condition is also considered, namely the specific voice frame is any frame in the voice superframe, and the specific voice frame can determine which voice frame is the specific voice frame according to the channel switching speed, the network characteristics and the like. For example, the network delay in the DMR private network system is expected to be within 120ms, and as can be seen from the above, it is only 60ms that the communication terminal uses the air interface to perform slot locking at the fastest speed, whereas a voice superframe includes 6 frames, each frame is 60ms, where voice frame a is the start of the superframe and has synchronization information, it is a more appropriate switching point to perform channel switching after receiving voice frame D because network delay may occur at any time, assuming that the channel is switched after voice frame D, if network delay occurs during channel switching, the network delay is 120ms, the voice frame a is just received after the channel switching, if the network delay does not occur in the process of switching the channel, the voice frame E can be received after the channel switching, therefore, the channel switching is carried out after the voice frame D is received, and the voice frame can be received as soon as possible after the handover. In addition, according to the time point of channel switching (for example, switching after receiving the voice frame D), the voice superframe characteristics (the voice superframe includes the voice frame a, the voice frame B, the voice frame C, the voice frame D, the voice frame E and the voice frame F, and each frame is 60ms) and the indication of the LCs (Start/Stop of LC signaling), the relationship between the voice frame received after the handover and the voice frame before the handover can be predicted, so that the voice reception can be ensured not to Stop during the handover.
Referring to fig. 2, fig. 2 is a flowchart illustrating a handoff method for voice communication according to a second embodiment of the present invention. The handover method of voice communication in the present embodiment includes the steps of:
s201: when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe; wherein the transmission time from a specific voice frame to the next synchronization signal frame is greater than or equal to the time for completing the slot synchronization and slot locking. If the specific voice frame is received, step S202 is executed, and if the specific voice frame is not received, the voice frame continues to be received until the specific voice frame is received, and step S202 is executed.
S202: switching from the current channel to the target channel.
In this implementation scenario, steps S201 and S202 provided in this embodiment are substantially similar to steps S101 and S102 in the previous embodiment, and are not described again here. The difference from the previous embodiment is that, in the present embodiment, the step S103 may include steps S203 and S204:
s203: and receiving the synchronous signal frame in the first time slot to complete time slot synchronization and detect first time slot information of the synchronous signal frame, and receiving other air interface frames in a second time slot adjacent to the first time slot and detecting second time slot information of the second time slot.
S204: and carrying out time slot locking through the first time slot information and the second time slot information.
It can be understood that, after the communication terminal switches channels, since the synchronization signal frame received by the communication terminal has the synchronization word SYNC, the communication terminal can locate the time slot by the synchronization signal frame, i.e. complete the time slot synchronization. According to the characteristics of a TDMA system, time is divided into two time slots, each time slot is 30ms, the time slot number is increased from 1 to 2 and then continuously circulates from 1, a terminal or a base station selects one time slot for communication, the time slots do not interfere with each other so as to ensure the utilization rate of frequency, a communication terminal needs to lock one time slot for communication, and then time slot detection can be carried out through an air interface of the communication terminal, and then the communication terminal can lock on the needed time slot according to the time slot number. Because the synchronization signal frame is divided into two time slots, each time slot carries time slot information, for example, CACH (common broadcast channel signaling), and the CACH of each time slot is marked with a time slot number TC (tdma channel), where TC has 1bit, that is, the value of TC is 0 or 1, it is possible to determine whether the corresponding time slot is a first air interface time slot or a second air interface time slot by detecting the value of TC. In a general scheme, a physical layer only has one time slot for detection, so after receiving a synchronous signal frame and detecting a time slot number TC of the synchronous signal frame in a previous time slot, other air interface frames are received and the time slot number TC of the other air interface frames are detected at an interval of one time slot, time slot locking is carried out in a next time slot after the time slot number TC of a next voice frame is detected, and then two frames of data are reported and the time slot locking is completed by at least 90 ms; if a time slot change is required, an additional 60ms is required, which results in a total of 150 ms. In this embodiment, both timeslots of the physical layer are detected, so that the synchronization signal frame can be received in the first timeslot and the first timeslot information of the synchronization signal frame can be detected, and the other air interface frames can be received in the second timeslot adjacent to the first timeslot and the second timeslot information of the second timeslot can be detected, so that the timeslot locking in the next timeslot after the second timeslot is realized through the first timeslot information and the second timeslot information, and therefore, it only needs 60ms to report two frames of data and complete the timeslot locking. Therefore, after the communication terminal is switched from the current channel to the target channel, the air interface is used for detecting the time slot numbers TC in CACH of the front time slot and the rear time slot of the synchronous signal frame and carrying out time slot locking, so that the time slot locking time can be reduced, and a voice frame can be received as soon as possible after handover.
In an embodiment, when the first time slot is an adjacent time slot of a target channel, the synchronization signal frame is a voice frame a or other air interface frame with synchronization information received by the adjacent time slot of the target time slot. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a principle of receiving a voice frame during a handover process in a first application scenario of the handover method for voice communication according to the present invention. As shown in fig. 3, channel switching is performed immediately after the voice frame D is received, after switching from channel1 (i.e., the current channel) to channel2 (i.e., the target channel), the timeslot adjacent to the target timeslot of the target channel receives the voice frame a or other air interface frames with synchronization information (i.e., the voice frame a in the figure) first, and because the voice frame a or other air interface frames with synchronization information received by the timeslot adjacent to the target channel can assist the target channel to perform timeslot synchronization, the timeslot locking can be completed before the voice frame F is received, and the communication terminal can receive the voice frame F immediately under such a condition, so that the communication terminal can receive the voice frame as soon as possible after handoff.
In another embodiment, when the first time slot is the target time slot of the target channel, the synchronization signal frame is the voice frame a received in the target time slot of the target channel. Referring to fig. 4, fig. 4 is a schematic diagram illustrating a principle of receiving a voice frame during a handover process in a second application scenario of the handover method for voice communication according to the present invention. As shown in fig. 4, channel switching is performed immediately after the voice frame D is received, and after switching is performed from channel1 (i.e., the current channel) to channel2 (i.e., the target channel), when an adjacent time slot without the target time slot of the target channel receives the voice frame a or another air interface frame with synchronization information first, it is necessary to wait for the target time slot of the target channel to receive the voice frame a for time slot synchronization, so that time slot locking can be completed after receiving the voice frame a, and the communication terminal can receive the voice frame B immediately under this condition, so that the communication terminal can receive the voice frame as soon as possible after handoff.
Further, the second embodiment of the handoff method for voice communication provided by the present invention may further include the following steps:
step S205: and acquiring the voice to be played according to the incidence relation between the received voice frame and the specific voice frame.
Step S206: and carrying out voice playing on the voice to be played.
It can be understood that, by means of steps S201 to S204, the communication terminal can receive the voice frame as soon as possible after handover, but the received voice frame is still discontinuous from the specific voice frame, so that after switching the channel and completing the time slot synchronization and the time slot locking, the association relationship between the received voice frame and the specific voice frame is needed, and then whether to process the received voice frame is selected according to the association relationship, and the voice to be played is acquired. And then, voice playing is carried out on the voice to be played, so that smooth butt joint can be carried out on the voice content before channel switching.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating an embodiment of step S205 in fig. 2. In one embodiment, the step S205 includes:
step S501: and judging whether a lost voice frame exists between the received voice frame and the specific voice frame. If yes, step S206 is executed, and if not, step S207 is executed.
Step S502: and recovering the lost voice frame through a vocoder, and taking the recovered lost voice frame and the received voice frame as voice to be played.
Step S503: and taking the received voice frame as voice to be played.
It can be understood that, by means of steps S201 to S204, the communication terminal can receive the speech frame as soon as possible after handover, but a situation that a part of the speech frame is lost still occurs, so after switching the channel and completing timeslot synchronization and timeslot locking, it is necessary to determine whether there is a lost speech frame between the speech frame continuously received through the target channel and the specific speech frame. If the condition of losing the voice frame exists, in order to realize smooth transition of the communication voice in the process of handover, the voice frame lost can be recovered through a vocoder, and the recovered voice frame lost and the voice frame continuously received through a target channel are taken as the voice to be played; if the situation of losing the voice frame does not exist, the voice frame does not need to be recovered, so the voice frame continuously received through the target channel is taken as the voice to be played. And then, the voice to be played is played in a voice mode, so that smooth butt joint can be carried out on the voice content before channel switching.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating a principle of recovering a lost voice frame during a handover process in a third application scenario of the handover method for voice communication according to the present invention. As shown in fig. 6, after the speech frame D is received, channel switching is performed immediately, and after the channel is switched from channel1 (i.e. the current channel) to channel2 (i.e. the target channel), if slot locking is completed before the speech frame F is received, it indicates that a lost speech frame (i.e. speech frame E) exists between the speech frame D and the speech frame continuously received by the communication terminal through channel2, and at this time, the speech frame E can be recovered through a vocoder, so that a situation that speech is lost when speech is played is avoided.
Referring to fig. 7, fig. 7 is a schematic flowchart illustrating another embodiment of step S205 in fig. 2. In another embodiment, the step S205 includes:
step S701: and acquiring the first number of the speech frames received at the latest and the second number of the speech frames received at the latest before switching to the target channel.
Step S702: and judging whether repeated voice frames exist between the first number of voice frames and the second number of voice frames. If yes, step S703 is executed, and if not, step S704 is executed.
Step S703: and removing the repeated voice frames from the received voice frames, and taking the received voice frames after the repeated voice frames are removed as voices to be played.
Step S704: and directly taking the received voice frame as the voice to be played.
It can be understood that, in order to avoid the problem of voice replay after handover of the communication terminal due to network delay, it is necessary to further determine whether there are repeated voice frames. Therefore, the first number of the voice frames received through the target channel and the second number of the voice frames received before the target channel is switched can be obtained, the first number of the voice frames and the second number of the voice frames are compared one by one, and whether repeated voice frames exist between the first number of the voice frames and the second number of the voice frames is further judged; if the repeated voice frames exist, removing the repeated voice frames from the received voice frames, and taking the received voice frames after the repeated voice frames are removed as voices to be played; and if no repeated voice frame exists, directly taking the received voice frame as the voice to be played. Referring to fig. 8, fig. 8 is a schematic diagram illustrating a principle of removing repeated voice frames during handover in a fourth application scenario of the handover method of voice communication according to the present invention; for example, three recently received voice frames are backed up before channel switching, and a specific voice frame is a voice frame D, so that the three voice frames are a voice frame B, a voice frame C and a voice frame D, after channel switching, the voice frame C and the voice frame D received for the first time through a target channel are compared and judged with the backed up three voice frames, and a repeated voice frame C and a repeated voice frame D are found to exist, so that the repeated voice frame C and the repeated voice frame D are removed, and repeated voice playing is reduced or avoided as much as possible.
In another embodiment, the received speech frames are encrypted speech frames; the step S205 may further include: and carrying out synchronous processing on the encrypted information according to the incidence relation between the encrypted voice frame received by the target channel and the specific voice frame. It can be understood that, when the received voice frame is an encrypted voice frame, the synchronization signal frame also has the encryption synchronization information, so that the synchronization processing of the encryption information can be performed according to the association relationship between the encrypted voice frame received by the target channel and the specific voice frame, thereby ensuring that a correct key stream is generated and realizing the decryption of the received encrypted voice frame. In the existing handover method, under the condition of voice encryption, after handover, embedded encryption header PI (Private Information, which carries encryption Information) Information needs to be received again, encryption parameters are initialized, and only one embedded encryption header PI (Private Information, which carries encryption Information) is provided for 720ms, so that the handover and word dropping for receiving encrypted voice are generally more than 1 second. In the embodiment, the cross-zone switching process of the encrypted call scene does not need to encrypt related synchronous information again, and does not depend on the air interface embedded encryption head PI, so that the continuity of the voice before and after the cross-zone switching is ensured.
In one embodiment, the handover condition includes that the carrier level of the signal received by the communication terminal is lower than a predetermined level value or that the distance from the communication terminal to the current base station is greater than a predetermined distance value. It is understood that when the communication terminal moves from the coverage of one base station to the coverage of another base station, the way to determine whether a handoff is required in order to maintain the channel switching that is required without interrupting the communication may be based on the received signal carrier level: for example, when the signal carrier level is lower than a threshold level, the handover is performed, or the communication terminal is only allowed to perform the handover when the signal of the current base station is weak enough (lower than a certain threshold) and the signal of the new base station is stronger than the signal of the current base station; or, the determination may be made according to the distance from the communication terminal to the current base station, for example, when the distance is greater than a preset distance value, the handover is performed.
Referring to fig. 9a to 9d, fig. 9a to 9d are schematic diagrams illustrating the effect of voice reception in a sixth application scenario of the handoff method of voice communication according to the present invention. In an application scenario, in order to verify the effect of the handover method for voice communication of the present application on reducing voice loss caused by handover during voice reception, a test was performed. Fig. 9a is a schematic diagram illustrating an effect of voice reception when the handover method of voice communication of the present application is not used in a case of unencrypted voice, fig. 9b is a schematic diagram illustrating an effect of voice reception when the handover method of voice communication of the present application is used in a case of unencrypted voice, fig. 9c is a schematic diagram illustrating an effect of voice reception when the handover method of voice communication of the present application is not used in a case of encrypted voice, and fig. 9d is a schematic diagram illustrating an effect of voice reception when the handover method of voice communication of the present application is used in a case of encrypted voice. It can be found that the effect of voice receiving when the handover switching method of the voice communication is adopted to carry out the handover switching is obvious no matter under the condition of voice encryption or under the condition of voice non-encryption, and the condition of voice falling is greatly reduced. In addition, through actual measurement, when a communication terminal under an individual call condition is subjected to handover from a system participation base station, under the condition that voice is not encrypted, the 'call drop time length' of the communication terminal without adopting the handover method of voice communication is more than 315ms, and the 'call drop time length' of the communication terminal with the handover method of voice communication is about 50 ms; in the case of voice hard encryption, the "drop time" of the communication terminal is 2042ms when the handover method of voice communication of the present application is not employed, and is 386ms when the handover method of voice communication of the present application is employed. When the communication terminal under the group calling condition is switched from the system participation base station, under the condition that voice is not encrypted, the 'word dropping time' of the communication terminal is more than 258ms when the communication terminal does not adopt the voice communication handover method, and the 'word dropping time' of the communication terminal is about 36ms when the communication terminal adopts the voice communication handover method; in the case of voice hard encryption, the "drop time" of the communication terminal is 1298ms when the handover method of voice communication of the present application is not used, and is 107ms when the handover method of voice communication of the present application is used. When the communication terminal under the group calling condition is switched from the non-participating base station of the system, under the condition that voice is not encrypted, the 'word-off duration' of the communication terminal is more than 777ms when the communication terminal does not adopt the voice communication handover method, and the 'word-off duration' of the communication terminal is about 164ms when the voice communication handover method is adopted; in the case of voice hard encryption, the "drop time" of the communication terminal is 1909ms when the handover method of voice communication of the present application is not employed, and is 291ms when the handover method of voice communication of the present application is employed. Therefore, the handover switching method of the voice communication can greatly reduce the dropped words generated by handover during voice receiving, and almost cannot hear the dropped words in the handover switching process.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a tdma communication system according to the present invention. The time division multiple access communication system in the application comprises at least two base stations 1001 and at least two communication terminals 1002, each base station 1001 has a communication coverage area, the at least two communication terminals 1002 realize voice communication through the at least two base stations 1001, and each communication terminal 1002 realizes any one of the above-mentioned voice communication handoff methods when in operation.
For the detailed description of the embodiments of the time division multiple access communication system provided in the present application, please refer to the above-mentioned detailed description of the embodiments of the handoff method for voice communication.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a communication terminal according to an embodiment of the present invention. The communication terminal 11 in the present application comprises a communication circuit 110, a memory 112 and a processor 114 coupled to each other; the communication circuit 110 is used for communication with other terminals; the memory 112 is used to store program data; the processor 114 executes the program data for implementing any of the above-described voice communication handoff methods.
For details of embodiments of the communication terminal provided in the present application, please refer to the detailed description of the above embodiments of the handover method for voice communication.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of a computer-readable storage medium according to the present invention. Stored in computer readable storage medium 12 in the present application is program data 120, program data 120 being executable to implement a handoff method for voice communications as described above. The computer-readable storage medium 12 may be a storage chip in a communication terminal, a readable and writable tool such as an SD card, or a communication terminal.
In the several embodiments provided in the present application, it should be understood that the disclosed voice communication handoff method, communication system, terminal and computer-readable storage medium may be implemented in other ways. For example, the above-described device architecture implementations are merely illustrative, and for example, a division of a module or a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A method for handoff of a voice communication, the method comprising:
when the communication terminal determines that the communication terminal meets the handover condition, the communication terminal detects whether the voice frame received by the current channel is a specific voice frame in a voice superframe; the transmission time from the specific voice frame to the next synchronous signal frame is more than or equal to the time for completing time slot synchronization and time slot locking;
if yes, switching from the current channel to a target channel;
receiving the synchronous signal frame, and completing the time slot synchronization and the time slot locking by utilizing the synchronous signal frame;
and continuously receiving the voice frame through the target channel.
2. The handoff method of claim 1 wherein said voice superframe comprises voice frame a, voice frame B, voice frame C, voice frame D, voice frame E, and voice frame F for 6 frames; wherein, the voice frame A is the starting point of the voice superframe and is the synchronous signal frame; the specific voice frame is any one frame in the voice superframe, and the specific voice frame is determined according to the channel switching speed and the network characteristics.
3. The handoff method of claim 1 wherein said step of receiving said synchronization signal frame and using said synchronization signal frame to perform said slot synchronization and said slot lock comprises:
receiving the synchronous signal frame at a first time slot to complete the time slot synchronization and detect first time slot information of the synchronous signal frame, and receiving other air interface frames at a second time slot adjacent to the first time slot and detecting second time slot information of the second time slot;
and performing the time slot locking through the first time slot information and the second time slot information.
4. The handover method of claim 3, wherein the synchronization signal frame is a speech frame a received in a target time slot of the target channel when the first time slot is the target time slot of the target channel.
5. The handover method according to claim 3, wherein when the first timeslot is a timeslot adjacent to a target timeslot of the target channel, the synchronization signal frame is a voice frame a or other air interface frame with synchronization information received in the timeslot adjacent to the target timeslot.
6. The handoff method of claim 1 wherein after said step of continuing to receive said speech frames over said target channel, said method comprises:
acquiring the voice to be played according to the received incidence relation between the voice frame and the specific voice frame;
and carrying out voice playing on the voice to be played.
7. The handoff method of claim 6 wherein said step of obtaining the speech to be played according to the association between the received speech frame and the specific speech frame comprises:
judging whether a lost voice frame exists between the received voice frame and the specific voice frame;
if the voice frame exists, recovering the lost voice frame through a vocoder, and taking the recovered lost voice frame and the received voice frame as voice to be played;
and if the voice frame does not exist, taking the received voice frame as the voice to be played.
8. The handoff method of claim 6 wherein said step of obtaining the speech to be played according to the association between the received speech frame and the specific speech frame comprises:
acquiring a first number of the received voice frames and a second number of the received voice frames before switching to the target channel;
judging whether repeated voice frames exist between the first number of voice frames and the second number of voice frames;
if the voice frame exists, removing the repeated voice frame from the received voice frame, and taking the received voice frame after the repeated voice frame is removed as the voice to be played;
and if the voice frame does not exist, directly taking the received voice frame as the voice to be played.
9. The handoff method of claim 6 wherein said received speech frames are encrypted speech frames;
the step of obtaining the voice to be played according to the received incidence relation between the voice frame and the specific voice frame comprises the following steps:
and carrying out synchronous processing on the encrypted information according to the incidence relation between the encrypted voice frame received by the target channel and the specific voice frame.
10. A time division multiple access communication system, comprising:
at least two base stations, each base station having a communication coverage area;
the at least two communication terminals realize voice communication through the at least two base stations; each of said communication terminals being operative to implement the method of any of claims 1-9.
11. A communication terminal, characterized in that the communication terminal comprises a communication circuit, a memory and a processor coupled to each other; the communication circuit is used for communicating with other terminals; the memory is used for storing program data; the processor executes the program data for implementing the method according to any of claims 1-9.
12. A computer-readable storage medium, in which program data are stored which can be executed by a processor, the program data being executable to implement a method according to any one of claims 1 to 9.
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| CN113038554B (en) * | 2021-03-08 | 2022-11-18 | 海能达通信股份有限公司 | Terminal handover method and related device |
| WO2022241606A1 (en) * | 2021-05-17 | 2022-11-24 | 海能达通信股份有限公司 | Network switching method and related apparatus |
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