CN111224713B - Signal transmitting method of communication terminal in time division multiple access direct mode - Google Patents
Signal transmitting method of communication terminal in time division multiple access direct mode Download PDFInfo
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- CN111224713B CN111224713B CN202010032512.1A CN202010032512A CN111224713B CN 111224713 B CN111224713 B CN 111224713B CN 202010032512 A CN202010032512 A CN 202010032512A CN 111224713 B CN111224713 B CN 111224713B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
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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 provides a signal transmitting method of a communication terminal in a time division multiple access direct mode, which comprises the following steps: the communication terminal detects whether one time slot in the double time slots is in an idle state; if the time slot is detected to be in an idle state, the communication terminal transmits a data frame to be transmitted in the time slot; if the time slot is detected to be in a busy state, the communication terminal detects whether the color code of the data frame transmitted in the time slot is the same as the color code of the data frame to be transmitted by the communication terminal; if the data frames are the same, the communication terminal does not transmit the data frames to be transmitted; if not, the communication terminal detects whether another time slot is in an idle state, and if the another time slot is in the idle state, the communication terminal transmits a data frame to be transmitted in the another time slot, and if the another time slot is in a busy state, the communication terminal does not transmit the data frame to be transmitted. The invention has simple implementation, simplifies the system design and can be seamlessly compatible with the conventional direct mode.
Description
Technical Field
The present invention relates to the field of communications. And more particularly to a signal transmission method of a communication terminal in a time division multiple access, TDMA, through mode, wherein time slots can be distinguished simply and efficiently.
Background
The Digital Mobile Radio (DMR) protocol is drafted for medium and low-end professional and commercial needs, and is applicable to industries such as utilities, schools, hospitals, hotels, property industries, and the like. The DMR protocol uses a dual-timeslot TDMA scheme, in order to allow two channels to coexist in a 12.5kHz bandwidth.
In the conventional through mode, the mobile station can only use one of the time slots when transmitting.
To improve the band utilization, DMR organization introduced a through dual slot mode in month 4 of 2012, and established two logical channels in one physical channel. In a direct-through dual-timeslot mode, two sets of interphones can directly communicate simultaneously at the same frequency without the help of a relay station.
To distinguish between different slots, the through dual slot mode uses a synchronization pattern. The voice synchronization pattern for slot 1, the data synchronization pattern for slot 1, the voice synchronization pattern for slot 2, and the data synchronization pattern for slot 2 in the cut-through dual slot mode are defined in the European Telecommunications Standards Institute (ETSI) Technical Specification TS (Technical Specification) 102-1.9.1.1 synchronization PDU. Users within the same group must set the same time slot to be used for communication.
In the direct connection double-time slot mode, a leader interphone with a leading channel time sequence exists, and other non-leader interphones need to calibrate the time slots of the leader interphones by taking the channel time slots of the leader interphones as references: the non-leader member interphone needs to identify the positions of the time slot 1 and the time slot 2 and then adjust the time slot of the non-leader member interphone to be synchronous with the channel time slot broadcasted by the leader interphone. The non-leader intercom is responsible for forwarding the received leader intercom time slot reference in the wide area system to ensure that all the intercom's of the wide area system use the same timing reference. And the non-leader interphone initiates communication in a self-preset time slot after acquiring the time slot reference of the leader interphone.
The prior art mainly has the following defects: firstly, a leader interphone with a leading channel time slot is needed, and other non-leader interphones synchronously communicate with the time slot of the leader interphone. This is equivalent to forming a simple system, which is relatively complex to implement. Second, since the synchronization pattern in the through dual slot mode is not consistent with the conventional through mode, additional processing is required for communication compatible with the conventional through mode.
Therefore, a method capable of solving the above technical problem, in which time slot discrimination can be performed, is required.
Disclosure of Invention
The present invention aims to provide a signal transmission method for a communication terminal in a time division multiple access, TDMA, through mode, in which time slots can be distinguished simply and efficiently in order to overcome the above-mentioned problems of the prior art.
In the radio field, time Division Multiple Access (TDMA) is a communication technology that enables sharing of a transmission medium or network. TDMA allows multiple users to use the same frequency in different time slots. The advantages of TDMA technology are enhanced anti-interference capability, high frequency utilization rate and increased system capacity.
The inventors of the present invention have realized that a color code is present in each DMR standard data frame to be transmitted by a communication terminal. In addition, it is known in the art that a "color code" is a common identifier used by a group of communication terminals communicating within a particular communication group, while communication devices in the pass-through mode all use the same color code. The invention is realized by utilizing the characteristic of the color code in the direct-through mode.
According to a first aspect of the present invention, there is provided a signal transmission method of a communication terminal in a time division multiple access through mode, the signal transmission method comprising:
the communication terminal detects whether one time slot in the double time slots is in an idle state;
in response to detecting that the time slot is in an idle state, the communication terminal transmits a data frame to be transmitted in the time slot;
in response to detecting that the time slot is in a busy state, the communication terminal detects whether a color code of a data frame transmitted in the time slot is the same as a color code of a data frame to be transmitted by the communication terminal; and is provided with
In response to detecting that the color code of the data frame transmitted in the time slot is the same as the color code in the data frame to be transmitted by the communication terminal, the communication terminal does not transmit the data frame to be transmitted;
and in response to detecting that the color code of the data frame transmitted in the time slot is different from the color code of the data frame to be transmitted by the communication terminal, the communication terminal detects whether another time slot is in an idle state, and in response to the other time slot being in the idle state, the communication terminal transmits the data frame to be transmitted in the other time slot, and in response to the other time slot being in a busy state, the communication terminal does not transmit the data frame to be transmitted.
The first aspect of the present invention relates to a two-slot mode in which, since it has been confirmed that a time slot indicated by a color code in a data frame to be transmitted by a communication terminal is different from one of the two time slots, the time slot indicated by the color code in the data frame to be transmitted should be the same as the other time slot, so that the communication terminal can transmit the data frame to be transmitted in the other time slot directly after confirming that the other time slot is idle.
The method of the invention can correctly identify the time slot in the time division multiple access mode. The method of the invention is simple to implement, and only when the communication terminal needs to transmit signals, the calibration can be carried out according to whether the time slot is busy, thereby simplifying the system design.
In addition, the present invention is seamlessly compatible with the conventional through mode since the same synchronization pattern is used as the conventional through mode.
According to a preferred embodiment of the signal transmission method of the present invention, the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the double slot.
Different time slots can be more reliably distinguished using a combination of two bits or a combination of three bits or a combination of four bits in the color code value.
According to a preferred embodiment of the signal transmission method of the present invention, at least one bit is the same in a combination of two bits for indicating one slot of the double slots and a combination of two bits for indicating the other slot of the double slots; or, in a combination of three bits for indicating one slot of the dual slots and a combination of three bits for indicating another slot of the dual slots, at least one bit is the same; or, at least one bit is the same in a combination of four bits for indicating one slot of the dual slots and a combination of four bits for indicating another slot of the dual slots.
According to a preferred embodiment of the signal transmission method of the present invention, the communication terminal detects whether the dual slot is in an idle state in real time.
The real-time monitoring can effectively utilize the channel and avoid resource waste.
According to a second aspect of the present invention, there is provided a signal transmission method in a time division multiple access through mode for a communication terminal, the signal transmission method comprising:
the method comprises the following steps: the communication terminal detects whether one of a plurality of time slots is in an idle state;
step two: in response to the detection that the time slot to be detected is in an idle state, the communication terminal transmits a data frame to be transmitted in the time slot to be detected; in response to detecting that the time slot to be detected is in a busy state, the communication terminal detects whether the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal;
step three: responding to the detection that the color code of the data frame transmitted in the time slot to be detected is the same as the color code in the data frame to be transmitted of the communication terminal, and not transmitting the data frame to be transmitted by the communication terminal;
step four: and in response to detecting that the color code of the data frame transmitted in the time slot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, the communication terminal detects whether another time slot, namely the time slot to be detected, is in an idle state, and returns to execute the second step to the fourth step.
A second aspect of the invention relates to a multislot mode. Similar to the dual-slot mode, the difference is that after detecting whether another slot is in the idle state, it is further required to detect whether the color code values are the same, and return to performing steps two to four.
According to a preferred embodiment of the signal transmission method of the present invention, the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the plurality of slots.
According to a preferred embodiment of the signal transmission method of the present invention, at least one bit is the same in a combination of two bits for indicating one slot of the plurality of slots and a combination of two bits for indicating another slot of the plurality of slots; or, at least one bit is the same in a combination of three bits indicating one of the plurality of slots and a combination of three bits indicating another one of the plurality of slots; or, at least one bit is the same in a combination of four bits for indicating one of the plurality of slots and a combination of four bits for indicating another one of the plurality of slots.
According to the preferred embodiment, the bit values in the color code values are not mutually exclusive, so that the present invention can be applied to channels of more than two slots.
According to a preferred embodiment of the signal transmission method of the present invention, the communication terminal detects whether or not the plurality of slots are in an idle state in real time.
According to a third aspect of the present invention, there is provided a signal transmission apparatus of a communication terminal in a time division multiple access through mode, the signal transmission apparatus comprising:
the first detection module is used for detecting whether one time slot in the double time slots is in an idle state or not through the communication terminal;
a first transmitting module, configured to transmit, by the communication terminal, a data frame to be transmitted in the timeslot in response to detecting that the timeslot is in an idle state;
a second detection module, configured to detect, by the communication terminal, whether a color code of a data frame transmitted in the time slot is the same as a color code of a data frame to be transmitted by the communication terminal in response to detecting that the time slot is in a busy state;
a first transmission prohibiting module, configured to respond to a detection that a color code of a data frame transmitted in the timeslot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted;
a third detecting module, configured to detect, by the communication terminal, whether another timeslot is in an idle state in response to detecting that a color code of the data frame transmitted in the timeslot is different from a color code of a data frame to be transmitted by the communication terminal;
a second transmitting module, configured to respond that the another timeslot is in an idle state, and transmit, by the communication terminal, a data frame to be transmitted in the another timeslot; and
and the second transmission forbidding module is used for responding to the other time slot being in a busy state, and the communication terminal does not transmit the data frame to be transmitted.
According to a preferred embodiment of the signal transmission device of the present invention, the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the double slot.
According to a preferred embodiment of the signal transmitting apparatus of the present invention, at least one bit is the same in a combination of two bits for indicating one slot of the double slots and a combination of two bits for indicating the other slot of the double slots; or, in a combination of three bits for indicating one slot of the dual slots and a combination of three bits for indicating another slot of the dual slots, at least one bit is the same; or, at least one bit is the same in a combination of four bits for indicating one slot of the dual slots and a combination of four bits for indicating another slot of the dual slots.
According to a preferred embodiment of the signal transmission apparatus of the present invention, the communication terminal detects whether the double slot is in an idle state in real time.
According to a fourth aspect of the present invention, there is provided a signal transmission apparatus of a communication terminal in a time division multiple access through mode, the signal transmission apparatus comprising:
a first detecting module, configured to detect, by the communication terminal, whether a timeslot of the multiple timeslots is in an idle state;
the first transmitting module is used for responding to the detection that the time slot to be detected is in an idle state and transmitting a data frame to be transmitted in the time slot to be detected through the communication terminal;
the second detection module is used for responding to the detection that the time slot to be detected is in a busy state, and detecting whether the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal through the communication terminal;
a first transmission prohibition module, configured to respond to a detection that a color code of a data frame transmitted in the to-be-detected time slot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted;
and the third detection module is used for responding to the detection that the color code of the data frame transmitted in the time slot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, and detecting whether another time slot, namely the time slot to be detected, is in an idle state or not through the communication terminal.
According to a preferred embodiment of the signal transmission device of the present invention, the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the plurality of slots.
According to a preferred embodiment of the signal transmitting apparatus of the present invention, at least one bit is the same in a combination of two bits for indicating one slot of the plurality of slots and a combination of two bits for indicating another slot of the plurality of slots; or, at least one bit is the same in a combination of three bits indicating one of the plurality of slots and a combination of three bits indicating another one of the plurality of slots; or, at least one bit is the same in a combination of four bits for indicating one slot of the plurality of slots and a combination of four bits for indicating another slot of the plurality of slots.
According to a preferred embodiment of the signal transmission apparatus of the present invention, the communication terminal detects whether or not the plurality of slots are in an idle state in real time.
According to a fifth aspect of the present invention there is provided a communications terminal comprising any of the signal transmission apparatus described in relation to the dual timeslot.
According to a sixth aspect of the present invention there is provided a communications terminal comprising any of the signal transmission apparatus described in relation to a plurality of time slots.
According to a seventh aspect of the present invention, there is provided a computer readable storage medium having stored thereon computer program code which, when executed on a computer, causes the computer to perform any of the signal transmission methods described in relation to a dual timeslot.
According to an eighth aspect of the present invention, there is provided a computer-readable storage medium having stored thereon computer program code which, when executed on a computer, causes the computer to perform any of the signal transmission methods described with respect to a plurality of time slots.
It will be appreciated by those skilled in the art that the second to eighth aspects of the present invention are capable of achieving the technical effects described in relation to the first aspect of the present invention.
Drawings
The invention will be more readily understood by the following description in conjunction with the accompanying drawings, in which:
fig. 1a shows a frame structure with a sync pattern in the DMR standard.
Fig. 1b shows a frame structure without a synchronization pattern in the DMR standard.
Fig. 2 is a diagram illustrating an embodiment of a signal transmission method in a dual slot mode according to the present invention.
Fig. 3 is an embodiment of a signal transmission method in a multislot mode according to the present invention.
Fig. 4 is a schematic diagram of time slot calibration implemented by using the signal transmission method of the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1a shows a frame structure with a sync pattern in the DMR standard, which includes four bits of color code in the slot type segment. Fig. 1b shows a frame structure without a synchronization pattern in the DMR standard, and includes a four-bit color code in the EMB section.
The inventors of the present invention have realized that a color code is present in each DMR standard data frame to be transmitted by a communication terminal. Additionally, it is known in the art that a "color code" is a common identifier used by a group of communication terminals communicating within a particular communication group. In the pass-through mode, the communication devices are in close proximity to each other, belong to the same network, organization or communication group, etc., and may have the same color code. The invention is realized by utilizing the characteristic of the color code in the direct-through mode.
Fig. 2 is a diagram illustrating an embodiment of a signal transmission method in a dual slot mode according to the present invention. As shown in fig. 2, the signal transmission method includes the steps of:
in block 201, the communication terminal checks to determine whether one of the dual slots is idle.
"idle state" means that there is no transmission of any signal in the slot, etc.
In block 202, in response to detecting that the timeslot is in an idle state, the communication terminal transmits a data frame to be transmitted in the timeslot.
In block 203, in response to detecting that the time slot is in a busy state, the communication terminal detects whether a color code of a data frame transmitted in the time slot is the same as a color code in a data frame to be transmitted by the communication terminal.
The "busy state" means that there is transmission of a signal in the slot, or the like. In the invention, a color code exists in a data frame to be transmitted by the communication terminal, and the color code value is preset in the communication terminal. The color code value cannot be changed during the call. Additionally, it should be understood that the color code values may be modified as needed while in the non-talk phase.
In block 204, in response to detecting that the color code of the data frame transmitted in the timeslot is the same as the color code in the data frame to be transmitted by the communication terminal, the communication terminal does not transmit or refrains from transmitting the data frame to be transmitted.
In block 205, in response to detecting that the color code of the data frame transmitted in the timeslot is different from the color code in the data frame to be transmitted by the communication terminal, the communication terminal detects whether another timeslot is in an idle state.
In block 206, the communication terminal transmits a data frame to be transmitted in the other time slot in response to the other time slot being in an idle state.
In block 207, the communication terminal does not transmit a data frame to be transmitted in response to the other time slot being busy.
Fig. 2 of the present invention relates to a dual slot mode, since it has been confirmed that a time slot indicated by a color code in a data frame to be transmitted by a communication terminal is different from one of the two time slots, and a time slot indicated by the color code in the data frame to be transmitted should be the same as the other time slot, the communication terminal can transmit the data frame to be transmitted in the other time slot directly after confirming that the other time slot is idle.
Fig. 3 is an embodiment of a signal transmission method in a multislot mode according to the present invention. As shown in fig. 3, the signal transmission method includes the steps of:
in block 301, the communication terminal detects whether a time slot of a plurality of time slots is in an idle state.
In block 302, in response to detecting that a timeslot to be detected is in an idle state, the communication terminal transmits a data frame to be transmitted in the timeslot to be detected.
In block 303, in response to detecting that the timeslot to be detected is in a busy state, the communication terminal detects whether a color code of a data frame transmitted in the timeslot to be detected is the same as a color code of a data frame to be transmitted by the communication terminal.
In block 304, in response to detecting that the color code of the data frame transmitted in the timeslot to be detected is the same as the color code in the data frame to be transmitted by the communication terminal, the communication terminal does not transmit or refrains from transmitting the data frame to be transmitted.
In block 305, in response to detecting that the color code of the data frame transmitted in the timeslot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, the communication terminal detects whether another timeslot, i.e., the timeslot to be detected, is in an idle state, and returns to perform the steps in blocks 302 to 305.
Figure 3 of the present invention relates to a multislot mode. Similar to the dual slot mode, the difference is that after detecting whether another slot is in an idle state, it is further required to detect whether the color code values are the same, and the steps in the blocks 302 to 305 are performed.
In a preferred embodiment, the color code value in the data frame transmitted by the communication terminal band is four bits, and a combination of two bits of the four bits or a combination of three bits or a combination of four bits is used to indicate the double slot or the plurality of slots.
Different time slots can be more reliably distinguished using a combination of two bits or a combination of three bits or a combination of four bits in the color code value.
In a preferred embodiment, at least one bit is the same in a combination of two bits for indicating the dual slot or one of the plurality of slots and a combination of two bits for indicating the dual slot or another of the plurality of slots; or, at least one bit is the same in a combination of three bits indicating the dual slot or one of the plurality of slots and a combination of three bits indicating the dual slot or another one of the plurality of slots; or, at least one bit is the same in a combination of four bits for indicating the dual slot or one of the plurality of slots and a combination of four bits for indicating the dual slot or another one of the plurality of slots.
For example, in a combination of two bits for indicating a slot, the correspondence is as follows: a color code value of '00' indicates a dual slot or one slot of the plurality of slots, and a color code value of '10' or '01' indicates a dual slot or another slot of the plurality of slots; or, a color code value '01' indicates a double slot or one slot of the plurality of slots, and a color code value '11' or '00' indicates a double slot or another slot of the plurality of slots; or, a color code value of "10" indicates a double slot or one of the plurality of slots, and a color code value of "11" or "00" indicates a double slot or another of the plurality of slots; alternatively, a color code value of '11' indicates a double slot or one slot of the plurality of slots, and a color code value of '10' or '01' indicates a double slot or another slot of the plurality of slots.
For example, in a combination of two bits for indicating a slot, the correspondence is as follows:
a color code value of "000" indicates a double time slot or one of the plurality of time slots, and a color code value of "001", "010", "011", "100", "101", or "110" indicates a double time slot or another of the plurality of time slots; alternatively, a color code value of "011" indicates a dual time slot or one of the plurality of time slots, and a color code value of "000", "001", "010", "011", "100", "101", or "111" indicates a dual time slot or another of the plurality of time slots; alternatively, a color code value of "010" indicates a double time slot or one of the plurality of time slots, and a color code value of "000", "001", "011", "100", "110", or "111" indicates a double time slot or another of the plurality of time slots; or, a color code value of "011" indicates a dual slot or one of the plurality of slots, and a color code value of "000", "001", "010", "100", "101", or "111" indicates a dual slot or another of the plurality of slots; or a color code value of "100" indicates a double time slot or one of the plurality of time slots, and a color code value of "000", "010", "011", "101", "110", or "111" indicates a double time slot or another of the plurality of time slots; or the color code value "101" indicates a double slot or one of the plurality of slots, and the color code value "000", "001", "011", "100", "110", or "111" indicates a double slot or another of the plurality of slots; or a color code value of "110" indicates a double slot or one of the plurality of slots, and a color code value of "000", "001", "010", "100", "101", or "111" indicates a double slot or another of the plurality of slots; or the color code value "111" indicates a double time slot or one of the plurality of time slots, and the color code value "001", "010", "011", "100", "101", or "110" indicates a double time slot or another one of the plurality of time slots.
According to the preferred embodiment, the bit values in the color code values are not mutually exclusive, so that the present invention can be applied to channels of more than two slots.
In a preferred embodiment, the communication terminal detects in real time whether the dual slot or the plurality of slots are in an idle state.
The real-time monitoring can effectively utilize the channel and avoid resource waste.
The present invention also provides a signal transmitting apparatus of a communication terminal in a tdma through mode, the signal transmitting apparatus comprising: a first detection module, configured to detect whether one of the dual timeslots is in an idle state through the communication terminal; a first transmitting module, configured to transmit, by the communication terminal, a data frame to be transmitted in the timeslot in response to detecting that the timeslot is in an idle state; a second detection module, configured to detect, by the communication terminal, whether a color code of a data frame transmitted in the time slot is the same as a color code of a data frame to be transmitted by the communication terminal in response to detecting that the time slot is in a busy state; a first transmission prohibition module, configured to respond to a detection that a color code of a data frame transmitted in the timeslot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted; a third detecting module, configured to detect, by the communication terminal, whether another timeslot is in an idle state in response to detecting that a color code of a data frame transmitted in the timeslot is different from a color code of a data frame to be transmitted by the communication terminal; a second transmitting module, configured to respond to that the another timeslot is in an idle state, and transmit, by the communication terminal, a data frame to be transmitted in the another timeslot; and a second transmission forbidding module, which is used for responding to the other time slot being in a busy state, and the communication terminal does not transmit the data frame to be transmitted.
The present invention further provides a signal transmitting apparatus of a communication terminal in a tdma through mode, the signal transmitting apparatus comprising: a first detection module, configured to detect, by the communication terminal, whether a timeslot in a plurality of timeslots is in an idle state; the first transmitting module is used for responding to the detection that the time slot to be detected is in an idle state and transmitting a data frame to be transmitted in the time slot to be detected through the communication terminal; the second detection module is used for responding to the detection that the time slot to be detected is in a busy state, and detecting whether the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal through the communication terminal; a first transmission prohibition module, configured to respond to a detection that a color code of a data frame transmitted in the to-be-detected time slot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted; and the third detection module is used for responding to the detection that the color code of the data frame transmitted in the time slot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, and detecting whether another time slot, namely the time slot to be detected, is in an idle state or not through the communication terminal.
In this context, the term module shall be used to refer to a functional unit or block that may be implemented at least in part by a dedicated hardware component, such as a custom circuit, and/or at least in part by one or more software processors or by appropriate code running on an appropriate general purpose processor or the like. The module itself may comprise further modules or functional units. A module may be provided by a plurality of components or sub-modules which need not be co-located and may be provided on different integrated circuits and/or run on different processors.
The invention also provides a communication terminal comprising a signal transmitting device as described in relation to any of the double or multiple time slots.
The present invention additionally provides a computer-readable storage medium having stored thereon computer program code which, when executed on a computer, causes the computer to perform any of the signal transmission methods described with respect to a dual slot or a plurality of slots.
Examples of computer-readable storage media include, but are not limited to, read Only Memories (ROMs), random Access Memories (RAMs), magnetic or optical disks, and the like.
In the present invention, the communication terminal includes, but is not limited to, an intercom.
Fig. 4 is a schematic diagram of time slot calibration implemented by using the signal transmission method of the present invention. Fig. 4 illustrates a schematic diagram of time slot calibration by taking a double time slot as an example.
As shown in fig. 4, in the case where there is signal transmission in slot 1, i.e., in the case where slot 1 is in a busy state, a signal is still transmitted before the signal transmission method of the present invention is used. Thus, two calls can affect each other.
After using the signal transmission method of the present invention, if there is signal transmission in slot 1, the communication terminal will perform transmission in slot 2, and if there is signal transmission in slot 2, the communication terminal will perform transmission in slot 1. In this way, two-way calls are well supported.
In summary, the general concept of the invention is: when a communication terminal needs to start transmission, it first detects whether there is a free time slot. If a slot is detected to be free, a signal is transmitted using the internal time reference of the machine, and the free slot is considered slot 1, and the color code in the signal transmitted by the machine corresponds to slot 1. A communication terminal configured with the same color code in a signal to be transmitted may prohibit transmission of the signal due to detection that slot 1 is busy. A communication terminal configured with a different color code in the signal to be transmitted may transmit the signal in an otherwise idle time slot. Thus, a new call can be established without affecting the existing call, so that one frequency can simultaneously support two calls.
It should be understood that although the present disclosure makes reference to particular embodiments, certain modifications and changes may be made to these embodiments without departing from the scope and coverage of the present disclosure. Moreover, no benefit, advantage, or solution to the problems described herein with regard to specific embodiments is intended to be construed as a critical, required, or essential feature or element. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim or embodiment, "a" or "an" does not exclude a plurality, and a single feature or other unit may fulfil the functions of several units recited in the claims or embodiments. Any reference signs or labels in the claims or embodiments should not be construed as limiting the scope thereof.
Claims (20)
1. A signal transmission method of a communication terminal in a time division multiple access through mode, the signal transmission method comprising:
the communication terminal detects whether one time slot in the double time slots is in an idle state;
in response to detecting that the time slot is in an idle state, the communication terminal transmits a data frame to be transmitted in the time slot;
in response to detecting that the time slot is in a busy state, the communication terminal detects whether a color code of a data frame transmitted in the time slot is the same as a color code of a data frame to be transmitted by the communication terminal; and is
In response to detecting that the color code of the data frame transmitted in the time slot is the same as the color code in the data frame to be transmitted by the communication terminal, the communication terminal does not transmit the data frame to be transmitted;
and in response to detecting that the color code of the data frame transmitted in the time slot is different from the color code of the data frame to be transmitted by the communication terminal, the communication terminal detects whether another time slot is in an idle state, and in response to the other time slot being in the idle state, the communication terminal transmits the data frame to be transmitted in the other time slot, and in response to the other time slot being in a busy state, the communication terminal does not transmit the data frame to be transmitted.
2. The signal transmission method of claim 1, wherein the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the double slot.
3. The signal transmission method according to claim 2, wherein at least one bit is the same in a combination of two bits for indicating one of the double slots and a combination of two bits for indicating the other of the double slots; or, in a combination of three bits for indicating one slot of the dual slots and a combination of three bits for indicating another slot of the dual slots, at least one bit is the same; or, at least one bit is the same in a combination of four bits for indicating one slot of the dual slots and a combination of four bits for indicating another slot of the dual slots.
4. The signal transmission method according to claim 1, wherein the communication terminal detects whether the dual slot is in an idle state in real time.
5. A signal transmission method for a communication terminal in a time division multiple access through mode, the signal transmission method comprising:
the method comprises the following steps: the communication terminal detects whether one of a plurality of time slots is in an idle state;
step two: in response to detecting that a time slot to be detected is in an idle state, the communication terminal transmits a data frame to be transmitted in the time slot to be detected; in response to detecting that the time slot to be detected is in a busy state, the communication terminal detects whether the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal;
step three: responding to the detection that the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal, and not transmitting the data frame to be transmitted by the communication terminal;
step four: and in response to detecting that the color code of the data frame transmitted in the time slot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, the communication terminal detects whether another time slot, namely the time slot to be detected, is in an idle state, and returns to execute the second step to the fourth step.
6. The signal transmission method of claim 5, wherein the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits of the four bits is used to indicate the plurality of slots.
7. The signal transmission method according to claim 6, wherein at least one bit is the same in a combination of two bits for indicating one of the plurality of slots and a combination of two bits for indicating another one of the plurality of slots; or, at least one bit is the same in a combination of three bits indicating one of the plurality of slots and a combination of three bits indicating another one of the plurality of slots; or, at least one bit is the same in a combination of four bits for indicating one slot of the plurality of slots and a combination of four bits for indicating another slot of the plurality of slots.
8. The signal transmission method according to claim 5, wherein the communication terminal detects whether the plurality of slots are in an idle state in real time.
9. A signal transmission apparatus of a communication terminal in a time division multiple access through mode, the signal transmission apparatus comprising:
the first detection module is used for detecting whether one time slot in the double time slots is in an idle state or not through the communication terminal;
a first transmitting module, configured to transmit, by the communication terminal, a data frame to be transmitted in the timeslot in response to detecting that the timeslot is in an idle state;
a second detection module, configured to detect, by the communication terminal, whether a color code of a data frame transmitted in the time slot is the same as a color code of a data frame to be transmitted by the communication terminal in response to detecting that the time slot is in a busy state;
a first transmission prohibiting module, configured to respond to a detection that a color code of a data frame transmitted in the timeslot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted;
a third detecting module, configured to detect, by the communication terminal, whether another timeslot is in an idle state in response to detecting that a color code of a data frame transmitted in the timeslot is different from a color code of a data frame to be transmitted by the communication terminal;
a second transmitting module, configured to respond that the another timeslot is in an idle state, and transmit, by the communication terminal, a data frame to be transmitted in the another timeslot; and
and the second transmission forbidding module is used for responding to the other time slot in a busy state, and the communication terminal does not transmit the data frame to be transmitted.
10. The signal transmitting device as claimed in claim 9, wherein the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the double slot.
11. The signal transmission apparatus of claim 10, wherein at least one bit is the same in a combination of two bits for indicating one of the double slots and a combination of two bits for indicating the other of the double slots; or, at least one bit is the same in a combination of three bits for indicating one of the dual slots and a combination of three bits for indicating another of the dual slots; or, at least one bit is the same in a combination of four bits for indicating one slot of the dual slots and a combination of four bits for indicating another slot of the dual slots.
12. The signal transmitting apparatus as claimed in claim 9, wherein the communication terminal detects whether the dual slot is in an idle state in real time.
13. A signal transmitting apparatus of a communication terminal in a time division multiple access through mode, the signal transmitting apparatus comprising:
a first detection module, configured to detect, by the communication terminal, whether a timeslot in a plurality of timeslots is in an idle state;
the first transmitting module is used for responding to the detection that the time slot to be detected is in an idle state and transmitting a data frame to be transmitted in the time slot to be detected through the communication terminal;
the second detection module is used for responding to the detection that the time slot to be detected is in a busy state, and detecting whether the color code of the data frame transmitted in the time slot to be detected is the same as the color code of the data frame to be transmitted by the communication terminal through the communication terminal;
a first transmission prohibition module, configured to respond to a detection that a color code of a data frame transmitted in the to-be-detected time slot is the same as a color code in a data frame to be transmitted by the communication terminal, and the communication terminal does not transmit the data frame to be transmitted;
and the third detection module is used for responding to the detection that the color code of the data frame transmitted in the time slot to be detected is different from the color code of the data frame to be transmitted by the communication terminal, and detecting whether the other time slot, namely the time slot to be detected is in an idle state or not through the communication terminal.
14. The signal transmitting apparatus of claim 13, wherein the color code value is four bits, and a combination of two bits or a combination of three bits or a combination of four bits among the four bits is used to indicate the plurality of slots.
15. The signal transmission apparatus of claim 14, wherein at least one bit is the same in a combination of two bits for indicating one slot of the plurality of slots and a combination of two bits for indicating another slot of the plurality of slots; or, at least one bit is the same in a combination of three bits indicating one of the plurality of slots and a combination of three bits indicating another one of the plurality of slots; or, at least one bit is the same in a combination of four bits for indicating one slot of the plurality of slots and a combination of four bits for indicating another slot of the plurality of slots.
16. The signal transmitting apparatus of claim 13, wherein the communication terminal detects whether the plurality of slots are in an idle state in real time.
17. A communication terminal comprising a signal transmission arrangement according to any of claims 9-12.
18. A communication terminal comprising a signal transmission arrangement according to any of claims 13-16.
19. A computer-readable storage medium having stored thereon computer program code which, when executed on a computer, causes the computer to execute the signal transmission method of any one of claims 1-4.
20. A computer-readable storage medium on which computer program code is stored, which when executed on a computer, causes the computer to perform the signal transmission method of any one of claims 5-8.
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| CN102844998A (en) * | 2010-04-15 | 2012-12-26 | 摩托罗拉解决方案公司 | Method for direct mode channel access |
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| US7499441B2 (en) * | 2004-06-29 | 2009-03-03 | Motorola, Inc. | Method for allowing a subscriber unit to access a channel for voice transmissions |
| US8208393B2 (en) * | 2008-10-17 | 2012-06-26 | Motorola Solutions, Inc. | Method and device for channel inspection in a communication system |
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| CN102844998A (en) * | 2010-04-15 | 2012-12-26 | 摩托罗拉解决方案公司 | Method for direct mode channel access |
| CN105075384A (en) * | 2013-03-11 | 2015-11-18 | 摩托罗拉解决方案公司 | Method and apparatus for resolving call collisions in a digital conventional direct mode |
| WO2016122249A2 (en) * | 2015-02-01 | 2016-08-04 | 엘지전자 주식회사 | Method for performing lbt in wireless access system supporting unlicensed band, and apparatus supporting same |
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