RU2441351C2 - Private network communication terminal and method for realising private network communication - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: disclosed is a private network Digital Mobile Radio (DMR) communication terminal and a communication method. The terminal has an interception module connected to a receiver and a transmitter, which operate according to the DMR standard. The interception module determines the time slot occupied by transmission which is received by the receiver. The interception module controls the transmitter in order to respond to the received transmission through a defined time slot. The interception module intercepts a free time slot and controls the transmitter to initiate transmission through the intercepted free time slot.

EFFECT: improved use of frame time slots.

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Description

Technical field

The present invention relates to communication technologies in a private network and, in particular, to a communication terminal of a private network and to a method for implementing communication in a private network.

State of the art

The DMR (Digital Mobile Radio) standard is the European standard established by the European Telecommunications Standards Institute (ETSI) instead of the analogue PMR (Private Mobile Radio). It has various advantages, such as a large coverage area, high transmission speed, high frequency spectrum utilization and good energy-saving effect. As a result, DMR-based mobile communications products have a good market outlook.

The DMR standard uses a TDMA frame structure with two time slots. 1 shows a TDMA DMR frame in direct mode. In direct mode, communication terminals communicate directly with each other without relay stations. Referring to FIG. 1, a TDMA DMR frame includes two completely identical time intervals, the duration of each time interval being 30 ms, and it is further divided into two loads of the same duration by the middle field of the synchronization pattern. A guard interval of 1.25 ms is provided at the two ends of each time slot, so a gap of 2.5 ms exists between the two time slots.

However, since the DMR standard does not further specify how two time intervals in a frame are used to simultaneously support two independent voice calls in direct mode (hereinafter abbreviated as “direct mode”), existing private network communication terminals based on the DMR standard can make a voice call using only one time slot in a frame. Figure 2 shows a diagram of the operating conditions 200 of a private network communication terminal based on the DMR standard. 2, there is a plurality of private network communication terminals 202 ~ 208 under operating conditions 200. A private network communication terminal 202 makes a voice call with a private network communication terminal 204. Although a voice call between a private network communication terminal 202 and a private network communication terminal 204 occupies only one time interval of a TDMA DMR frame, a private network communication terminal 206 and a private network communication terminal 208 in the same geographical area cannot make a voice call with a different time interval.

The reason for the above problem is that, although the voice call between the private network communication terminal 202 and the private network communication terminal 204 occupies only one time interval, other communication terminals of the private network in the same geographical area cannot determine in advance which time interval is an unoccupied time slot because the position of the occupied time interval is not fixed (i.e., the occupied time interval may be the first time interval in the TDMA DMR frame or the last time interval scarlet in TDMA DMR frame and a busy time slot is selected and used corresponding to a voice call party arbitrarily). Thus, new voice calls cannot be initiated.

Thus, a technical solution is needed that can overcome the defects inherent in the prior art.

SUMMARY OF THE INVENTION

The present invention provides a private network communication terminal and a method for implementing voice communication to solve the above-described problem, namely, that the position of an unoccupied time interval cannot be determined in advance, since the position of the occupied time interval is not fixed, and thus, another independent voice call cannot be initiated with using a different time interval.

The present invention provides at least the following technical solutions.

A private network communication terminal adapted to respond to a transmission in a private network and initiate direct transmission in a private network, comprising a receiver and a transmitter, the private network communication terminal further comprising:

interception module connected to the receiver and transmitter and adapted for:

determining a time interval occupied by the transmission in the private network that the receiver receives and controlling the transmitter to respond to the received transmission in the private network through the time interval; and

intercepting a free time interval and controlling a transmitter to initiate transmission in a private network through an intercepted free time interval.

In a communication terminal of a private network according to the invention, in which

the receiver is adapted to receive transmission in a private network based on the DMR standard and

the transmitter is adapted to respond to a received transmission in the private network and initiate transmission in the private network according to the DMR standard.

In the communication terminal of a private network of the invention, the intercept module is adapted to intercept an idle slot in a TDMA DMR frame.

In the communication terminal of a private network of the invention, the intercept module is adapted to intercept an idle time slot in a TDMA DMR frame in a carrier interception mode.

In the private network communication terminal of the invention, in the absence of a TDMA DMR frame interception by the interception module, the interception module is adapted to control the transmitter to directly initiate transmission in the private network.

The invention additionally provides a communication method in a private network for responding to transmission in a private network and initiating direct transmission in a private network, comprising the steps of:

determining a time interval occupied by the received transmission in the private network, and responding to the transmission in the private network through the time interval; and

intercept the free time interval and initiate transmission in the private network through the intercepted free time interval.

According to a communication method in a private network according to the invention,

at the stage of the response to the received transmission in the private network, they respond to the received transmission in the private network according to the DMR standard and

in the step of initiating transmission in the private network, transmission in the private network is further initiated according to the DMR standard.

According to a communication method in a private network according to the invention:

at the step of intercepting a free time interval, the free time interval in the TDMA DMR frame is intercepted.

According to a communication method in a private network according to the invention, in the step of intercepting a free time slot in a TDMA DMR frame, the free time slot in a TDMA DMR frame in a carrier interception mode is additionally intercepted.

The communication method in a private network in accordance with the invention further comprises the step of: initiating transmission in the private network directly in the absence of a TDMA DMR frame interception.

Technical solutions of the invention, at least, lead to the following beneficial effects. The responding side of the transmission in the private network responds with the time interval occupied by the received transmission in the private network, which allows communication in the private network using the time interval in a fixed position in the TDMA DMR frame. Consequently, other communication terminals of the private network that are not involved in the transmission in the private network can pre-determine the idle time interval and can initiate a new transmission in the private network with an unoccupied time interval. In this way, channel utilization can be improved.

Brief Description of the Drawings

The invention will be further illustrated in conjunction with the drawings and embodiments, in the drawings:

figure 1 - existing frame TDMA DMR;

figure 2 - diagram of the operating conditions of the existing communication terminal of a private network based on the DMR standard;

3 is a flowchart of a method for initiating transmission in a private network according to one preferred embodiment of the invention;

4 is a flowchart of a method for transmitting a response in a private network according to one preferred embodiment of the invention;

5 is a diagram of operating conditions according to one preferred embodiment of the invention; and

6 is a block diagram of a private network communication terminal according to one preferred embodiment of the invention.

Detailed Description of Embodiments

To explain the above objectives, technical solutions and advantages of the invention, the invention will be further illustrated in detail in connection with the drawings and embodiments. Note that the embodiments described herein are used only to explain the invention, and not to limit the scope of the invention.

FIG. 3 is a flow diagram of a method 300 for initiating transmission in a private network according to one preferred embodiment of the invention. 3, method 300 begins at an initial step 302 where a private network communication terminal is turned on to initiate transmission in the private network.

Then, in the next step 304, the TDMA DMR frame and the free time slot in it are intercepted. When a communication terminal of a private network in a geographic area initiates transmission in a private network, a TDMA DMR frame is formed, and a carrier that carries a TDMA DMR frame is simultaneously received by all communication terminals of a private network in a geographic area. In particular, the carrier that carries the TDMA DMR frame can be intercepted, and the free time interval in the TDMA DMR frame can be determined in the following modes, for example, but without limitation, RSSI detection (received signal strength indicator), carrier interception, etc. d. For example, firstly, the synchronization can be set according to the synchronization pattern to distinguish each time interval; then, RSSI detection or carrier interception is performed at each time interval to determine the free time interval in it.

Then, in the next step 306, a call origination command is received, for example, it is detected that a conversation button on the communication terminal of the private network is pressed.

Then, in the next step 308, a decision is made whether a TDMA DMR frame exists, that is, if a carrier that carries a TDMA DMR frame is intercepted; if so, the flow proceeds to step 310; otherwise, it proceeds to step 312.

As described above, if it is determined at step 308 that a TDMA DMR frame exists, the flow proceeds to step 310. At step 310, a decision is made whether there is a free time slot in the TDMA DMR frame; if so, the method proceeds to step 314; otherwise, step 312 is repeated until a free time slot in the TDMA DMR frame is intercepted.

As described above, in step 312, if it is determined that a free time slot exists in the TDMA DMR frame, the method proceeds to step 314. In step 314, transmission in the private network is initiated using the intercepted free time interval, after which the method proceeds to step 316.

As described above, if it is determined in step 308 that the TDMA DMR frame does not exist, the method proceeds to step 312. In step 312, transmission in the private network is initiated directly, that is, transmission in the private network is initiated according to the standard direct transmission mode specified in the DMR standard ; after that, the method proceeds to step 316.

Finally, the method 300 ends at step 316.

According to the aforementioned method 300 of the invention, in direct mode, during initiation of transmission in a private network, an idle time slot in a TDMA DMR frame is intercepted and then transmission in a private network is initiated through an intercepted idle time slot. Thus, one free time slot can be used to initiate a new transmission in the private network when another time slot in the TDMA DMR frame is busy, which implies that transmissions in the private network occur simultaneously with two time slots in the TDMA DMR frame.

However, when one time slot in the TDMA DMR frame is busy, in the case where another free time slot in the TDMA DMR frame is to be used to initiate a new transmission in the private network, it is additionally required that one transmission in the private network occupy only one time slot. Only under this condition can a private network communication terminal that is not involved in transmission in the private network intercept the free time slot in the TDMA DMR frame (i.e., the next time slot after a busy time slot is a free time slot) by determining the busy time slot ( i.e., establishing synchronization with a busy time slot), and then a new transmission in the private network is initiated using the free time slot. From the description below in connection with FIG. 4, it follows that the time interval used to respond to the received transmission in the private network is the time interval occupied by the received transmission in the private network. Thus, it is guaranteed that one transmission in a private network will occupy only one time slot.

Before proceeding to the description of the technical solution shown in FIG. 4, we pay attention to the fact that the implementation of the response to the received transmission in the private network according to FIG. 4 includes the release by the communication terminal of the private network, which is the receiving side of data transmission in the private network call data as a response during the Call Hangtime period after receiving the transmission in the private network. However, for the call data generated after the Call Hangtime time period, the initiated transmission in the private network will be processed according to the method shown in FIG. 3. Moreover, the implementation of the response to the received transmission in the private network includes the implementation of the response to the received transmission in the private network by the calling and called parties in the transmission process in the private network. A method for implementing a transmission response in a private network is described below in conjunction with FIG.

Figure 4 shows a logical flowchart of a method for transmitting a response in a private network according to one preferred embodiment of the invention. 4, method 400 begins at step 402.

Then, in the next step 404, transmission in the private network is received. For example, a TDMA DMR frame that carries transmission in a private network is intercepted by the communication terminal of the private network, and the communication terminal of the private network is defined as the called side of the transmission in the private network by checking the link control information. Then, the communication terminal of the private network receives transmission in the private network.

Then, in the next step 406, a time interval in which a received transmission exists in the private network exists, that is, a determination is made through which time interval in the TDMA DMR frame the received transmission in the private network is transferred.

Then, in the next step 408, during the Call Hangtime time period, the response is carried out in the time interval determined in step 406.

Finally, method 400 ends at step 410.

From figure 4 it follows that during transmission in the private network, the calling and called parties are constantly communicating in the private network using the same time slot in the TDMA DMR frame, and the time slot is the time slot originally used by the party initiating the call , to initiate a call. When the calling and called parties use the same time slot in the TDMA DMR frame to communicate in the private network, private network communication terminals that are not involved in transmission in the private network can intercept the free time slot in the TDMA DMR frame by determining the occupied time interval and then initiate a new call using the free time interval.

According to the above description, illustrated in conjunction with FIG. 3 and FIG. 4, it can be summarized that, according to the method for realizing communication in a private network provided by the invention, when responding to a received transmission in a private network, the time interval occupied by the received transmission is first determined private network, and then the response to the received transmission in the private network is carried out after a certain time interval; and before initiating transmission in the private network, the free time interval is intercepted, and then transmission in the private network is initiated through the intercepted free time interval. Since the calling and called parties communicate in the private network all the time with the same time slot in the TDMA DMR frame, communication terminals of the private network that are not involved in transmission in the private network can intercept the free time slot in the TDMA DMR frame by determining the occupied time interval and then initiate a new call using the free time interval.

The method for implementing communication in a private network provided by the invention is described in detail below in connection with the operating conditions shown in FIG.

Figure 5 shows a diagram of operating conditions according to one preferred embodiment of the invention. 5, operating set 500 shows a plurality of private network communication terminals in the same geographical area, for example, private network communication terminals 502 ~ 508. The following describes the process of implementing communication in a private network between these communication terminals 502 ~ 508 of the private network.

First of all, the private network communication terminal 502 initiates transmission in the private network to the private network communication terminal 504. Assuming this time that no TDMA DMR frame has been intercepted by the private network communication terminal 502, the private network communication terminal 502 initiates transmission in the private network directly as described in the above method 300. Then, the TDMA DMR frame that carries the transmission in the private network, simultaneously received by the private network communication terminals 504 ~ 508.

Then, the private network communication terminal 504 is defined as the called side of the transmission in the private network initiated by the private network communication terminal 502. Thus, the private network communication terminal 504 receives the transmission in the private network and determines the time interval occupied by the transmission in the private network. Then, the private network communication terminal 504 responds to the transmission in the private network using a time interval during the Call Hangtime period.

Then, the private network communication terminal 502 receives the private network transmission generated by the private network communication terminal 504 as a response and determines the time interval occupied by the transmission in the private network. Then, the private network communication terminal 502 responds to the transmission in the private network using a time interval during the Call Hangtime period. This process is repeated until the transfer in the private network between the communication terminals 502 ~ 504 of the private network is completed.

We assume that the private network communication terminal 506 initiates transmission in the private network to the private network communication terminal 508, during a process in which the transmission in the private network is between the private network communication terminals 502 ~ 504. Since the TDMA DMR frame generated by the private network communication terminal 502 when initiating transmission in the private network will be simultaneously received by the private network communication terminals 504 ~ 508, the private network communication terminal 506 can determine the time interval occupied by the transmission in the private network between the communication terminals 502 ~ 504 the private network, and initiate a call to the private network communication terminal 508 using an unoccupied time slot in the TDMA DMR frame. After receiving transmission in the private network initiated by the private network communication terminal 506, the process in which the private network communication terminal 508 responds is identical to the process in which the private network communication terminal 504 responds.

From the foregoing, it follows that, according to the method for implementing communication in a private network provided by the invention, transmissions in a private network can be performed simultaneously using two time slots in a TDMA frame, based on the DMR standard.

In addition to the above method of initiating transmission in a private network and responding to it, the invention further provides a communication terminal of the private network that can initiate transmission in the private network and respond to it according to the aforementioned method. A private network communication terminal will be described in detail below in connection with FIG.

6 is a block diagram of a private network communication terminal according to one preferred embodiment of the invention. 6, a private network communication terminal 600 includes a transmitter 602, an intercept module 604, and a receiver 606. An intercept module 604 is connected to a transmitter 602 and a receiver 606, respectively.

The functions of transmitter 602 and receiver 606 are well known in the art and, therefore, descriptions thereof are omitted here.

After the receiver 606 receives the transmission in the private network, the intercept module 604 determines the time interval in which there is transmission in the private network received by the receiver 606, and controls the transmitter 602 to respond to the received transmission in the private network at a specific time interval.

Additionally, the intercept module 604 is further adapted to intercept a TDMA DMR frame and a free time slot therein. For example, the intercept module 604 may perform RSSI detection or carrier interception by a receiver 606 to determine if a TDMA frame exists and to intercept a free time slot in it. When initiating transmission in the private network, if TDMA DMR frames do not exist, the intercept module 604 may control the transmitter 602 to initiate transmission in the private network directly; and if a TDMA DMR frame exists, the intercept module 604 can control the transmitter 602 to initiate transmission in the private network at an intercepted free time slot in the TDMA DMR frame.

Note that although each of the above embodiments is described according to the DMR standard, those skilled in the art can understand that the technical solutions provided by the invention can also be applied to a solution in which communication in a private network is based on standards other than the DMR standard .

The above describes only preferred embodiments of the invention, not intended to limit the scope of the invention; and various modifications and variations can be offered without departing from the essence or scope of the invention, which are defined by the claims and its equivalents.

Claims (8)

1. The communication terminal of a private network DMR (Digital Mobile Radio - Digital Mobile Radio), adapted to respond to transmission in a private network and initiate transmission in a private network in direct mode, containing a receiver and a transmitter, and the communication terminal of the private network further comprises
an interception module connected to the receiver and the transmitter and adapted to determine a time interval occupied by the transmission in the private network that the receiver receives and control the transmitter to respond to the received transmission in the private network after a certain time interval, and
intercepting a free time interval and controlling a transmitter to initiate transmission in a private network through an intercepted free time interval,
moreover, the receiver is adapted to receive transmission in a private network based on the DMR standard, and
the transmitter is adapted to respond to a received transmission in the private network and initiate transmission in the private network according to the DMR standard. 2. The DMR private network communication terminal according to claim 1, wherein the interception module is adapted to intercept a free time slot in a time division multiple access (TDMA) DMR frame. 3. The DMR private network communication terminal according to claim 2, wherein the interception module is adapted to intercept a free time slot in a TDMA DMR frame in a carrier interception mode. 4. The DMR private network communication terminal according to claim 3, wherein, in the absence of a TDMA DMR frame interception by the interception module, the interception module is adapted to control the transmitter to directly initiate transmission in the private network. 5. A method of communication in a private network DMR (Digital Mobile Radio - Digital Mobile Radio) to respond to transmission in a private network and initiate transmission in a private network in direct mode, comprising the steps of
determining a time interval occupied by the received transmission in the private network, and responding to the transmission in the private network through the time interval, and
intercept a free time interval and initiate transmission in a private network through an intercepted free time interval,
moreover, at the stage of implementation of the response to the received transmission in the private network, they respond to the received transmission in the private network according to the DMR standard, and
in the step of initiating transmission in the private network, transmission in the private network is further initiated according to the DMR standard. 6. The communication method in a private DMR network according to claim 5, wherein in the step of intercepting a free time interval, a free time interval is intercepted in a time division multiple access (TDMA) DMR frame. 7. The communication method in a private DMR network according to claim 6, wherein in the step of intercepting a free time slot in a TDMA frame, the DMRs further intercept the free time slot in a TDMA DMR frame in a carrier interception mode. 8. The communication method in a private DMR network according to claim 7, further comprising the step of initiating transmission in the private network directly in the absence of a TDMA DMR frame interception.

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