CN108924769B - Simple signaling cluster communication method - Google Patents
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
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Abstract
A simple signaling cluster communication method comprises the following steps: firstly, the base station codes a control command into a simple signaling which simultaneously comprises channel coding; setting codes corresponding to the simple signaling by the base station; thirdly, modulating the code on a transmitting carrier; receiving and demodulating by the terminal to obtain the code; the terminal obtains a control instruction according to a control instruction preset in the terminal and the simple signaling coding corresponding table; and sixthly, the terminal completes the cluster communication operation according to the control instruction. Step sixthly, finishing the cluster communication operation: after any terminal initiates a call, the terminal transfers a control channel in cooperation with the base station, uses the original control channel as a service channel for communication, and switches to the original control channel after the communication is finished. A software module is respectively added in a base station and a terminal of a low-cost conventional communication system to realize a cluster function, channel attributes are dynamically switched according to service changes, frequency point multiplexing is realized, channel congestion is reduced, and therefore the utilization rate of wireless channel resources and equipment is improved.
Description
The patent application of the invention is a divisional application with the patent application number of CN201410121615. X; the patent application number of cn201410121615.x is patent application date of 2014 03 and 28, and the patent application name is 'trunking communication method and system based on conventional terminals'.
Technical Field
The invention relates to a wireless intercom system in the field of electric communication, in particular to a trunking communication method and a trunking communication system based on a conventional terminal.
Background
Name interpretation:
cdcss (continuous Digital Controlled Squelch system), continuous Digital control Squelch system, also called Digital sub-sound;
msk (minimum Shift keying), minimum Shift keying, is a digital modulation mode applied in the field of mobile communications;
cci (control Channel identifier), control Channel identity;
bci (busy Channel identifier), busy Channel identification;
gtc (go To channel), channel switching;
PTT (push To talk), push To talk, also referred To as PTT button on intercom.
The conventional ctcss (continuous Tone Controlled Squelch system) signaling refers to a sub-audio Controlled mute selective call signaling, which is also called Tone lock or Tone muting. It is a kind of sub-audio signaling used by multiple communication systems to share one channel and prevent mutual interference. It can effectively prevent illegal user from entering the system. CTCSS signaling is the superposition of low-level sub-audio tones on the transmitted carrier, each system having its own specific tone, which is transmitted each time the user turns on the transmitter and continues throughout the call. In simple trunked communication systems, the signaling is often used to implement group calls or as a system identification tone.
The subsonic sound includes a transmitting subsonic sound and a receiving subsonic sound. In general, a terminal transmits a sub-tone to enter a trunking network, so that the terminal can enter the trunking network. Whereas the trunked relays or base stations use "receive subsonic", signals without subsonic tones are rejected by the base station. The trunk or base station downlink signals of the cluster have no, but also have subtones. In order to eliminate signals that the terminal does not need to listen to when receiving, the terminal may similarly add a reception sub-tone. The agreed-upon infrasound is also often used between two or more stations to reject extraneous interference signals.
The wireless communication system capable of realizing the trunking function in the prior art can realize flexible grouping and channel multiplexing, but the technology is complex and the price is high. In the prior art, the frequency point of a conventional wireless communication system is fixed, and multiple frequency points are grouped according to the frequency point, so that flexible grouping and channel multiplexing cannot be realized; if a conventional system is used to realize the trunking function, multiple sets of conventional relay stations are generally required to be erected to realize the forwarding of multiple frequency points, and the method has high cost.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a simple trunking communication method and system based on the conventional intercom system, which avoids the disadvantages of the prior art. The method and the system integrate the advantages of low cost of the conventional system and high resource utilization rate of the cluster system, utilize the base station and the terminal of the conventional communication system, realize cluster functions of channel allocation, group calling, full calling and the like by respectively adding a software module in the base station and the terminal, and improve the utilization rate of wireless channel resources and equipment. Flexible grouping, rich service types and low realization cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: a simple signaling cluster communication method comprises the following steps:
firstly, the base station codes a control command into a simple signaling which simultaneously comprises channel coding;
setting codes corresponding to the simple signaling by the base station;
thirdly, modulating the code on a transmitting carrier;
receiving and demodulating by the terminal to obtain the code;
the terminal obtains a control instruction according to a control instruction preset in the terminal and the simple signaling coding corresponding table;
and sixthly, the terminal completes the cluster communication operation according to the control instruction.
The control instruction comprises a control channel identification CCI, a busy channel identification BCI and a channel transfer instruction GTC.
In the third step, the signaling code is modulated and transmitted by using a CDCSS or MSK method, and may be also modulated and transmitted by using other digital modulation techniques.
Finishing the cluster communication operation in the step sixthly, comprising the following steps:
6.1 idle state, all terminals wait under control channel A;
6.2 any terminal of any group K initiates a call in a control channel A and transmits the block code of the group K to a base station;
6.3 the base station receives the wireless signal sent by the terminal and decodes the wireless signal to obtain the block code;
6.4 the base station finds an idle channel and sets it as a new control channel B;
6.5 the base station sends a channel transfer instruction GTC in the original control channel A to indicate other terminals except the group K to transfer to a control channel B;
6.6 the base station controller switches the control channel A to the traffic channel C;
6.7 the group K calls on the traffic channel C;
6.8 after the call of the traffic channel C is finished, the base station starts to broadcast the channel transfer instruction GTC in the traffic channel C at fixed time, so that all the terminals are transferred to the control channel B. And the base station intermittently sends channel transfer instructions GTC for prompting the frequency points of the control channel on all the idle channels. The block coding of the group in step 6.2 and the channel transfer command GTC in step 6.5 are periodically sent radio signaling. Namely, the completion of the cluster communication operation in the step (sixthly) comprises the following steps: waiting all terminals under a control channel A in an idle state; the base station receives and decodes the packet code to obtain the packet code, finds an idle channel at the same time and sets the idle channel as a new control channel B; after the calling of the service channel C is finished, the base station starts to broadcast a channel transfer instruction at the fixed time in the service channel C, so that all the terminals are transferred to the control channel B. After any terminal initiates a call, it transfers control channel with the base station, and uses the original control channel as the service channel to communicate, and switches to the original control channel after finishing the communication.
According to the method, a software module is added in each of a base station and a terminal of a low-cost conventional communication system to realize a cluster function, channel attributes are dynamically switched according to changes of services, multiplexing of frequency points is realized, and congestion of channels is reduced. Thereby improving the utilization of wireless channel resources and equipment.
The technical scheme adopted by the invention for solving the technical problem also comprises the following steps: a simple signaling trunking communication base station comprises a base station controller, at least one set of channel machine, a branching and branching device, a duplexer and an antenna feed system; the base station controller comprises a simple signaling coding unit, and the coding unit comprises a base station control instruction and a simple signaling coding corresponding table; the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table.
The technical scheme adopted by the invention for solving the technical problem further comprises the following steps: a simple signaling cluster communication terminal comprises radio frequency circuits, a baseband, a display keyboard, micro control system units, and a voice input MC unit and a voice output LS unit, wherein the micro control system units also comprise a simple signaling coding unit which comprises a control instruction and simple signaling coding corresponding table; the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table; the terminal receives CDCSS or MSK signals sent from the base station to obtain simple signaling codes, obtains control instructions according to control instructions preset in the terminal and the simple signaling code corresponding table, and then completes cluster communication operation according to the control instructions.
The technical solution adopted to solve the technical problems of the present invention finally comprises: a simple signaling cluster communication system comprises a base station and a terminal; the base station comprises a base station controller, at least one set of channel machine, a branching and branching device, a duplexer and an antenna feed system; the base station controller also comprises a simple signaling coding unit, the simple signaling coding unit comprises a base station control instruction and simple signaling coding corresponding table, and the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table; the terminal comprises radio frequency circuits, a baseband, a display keyboard, various units of a micro-control system and two units of voice input MC and output LS, wherein the micro-control system unit comprises a simple signaling coding unit which also comprises a control instruction and simple signaling coding corresponding table, and the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table; the terminal receives CDCSS or MSK signals sent by the base station to obtain simple signaling codes, obtains control instructions according to control instructions preset in the terminal and a simple signaling code corresponding table, and completes cluster communication operation according to the control instructions.
Compared with the prior art, the invention has the advantages that a software module is respectively added in the base station and the terminal of the conventional interphone communication system to meet the general trunking service requirements of channel allocation, group calling, full calling and the like; the software module transmits the control instruction code of the trunking communication by means of simple signaling, so that the traditional talkback system realizes the trunking communication function and can realize the distinction of a control channel and a service channel; on one hand, the utilization efficiency of the physical channel is improved, the utilization rate of wireless channel resources and equipment is improved, and on the other hand, the cluster grouping of the communication method and the system is flexible, the service types are rich, and the advantages of low cost of a conventional communication system and high resource utilization rate of the cluster communication system are achieved.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the method steps of a preferred embodiment of the present invention;
FIG. 2 is a diagram illustrating a channel scheduling status according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram illustrating a channel scheduling status according to an embodiment of the present invention;
FIG. 4 is a third exemplary diagram illustrating a channel scheduling status according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a base station according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a terminal assembly according to an embodiment of the present invention;
FIG. 7 is a table of prior art digital sub-tone codes, where the codes are in hexadecimal;
FIG. 8 is a hexadecimal code mapping table of control commands and simple signaling according to an embodiment of the present invention;
fig. 9 is a hexadecimal coding table of physical channels and terminal packets according to an embodiment of the invention.
[ detailed description ] embodiments
The present invention will be described in further detail with reference to preferred embodiments. Referring to fig. 1, the communication method of the present invention includes the steps of:
201. all terminals wait under the control channel of the base station in an idle state;
202. the terminal presses PTT key to initiate group calling under the control channel, and the control channel receiver receives the wireless signal and decodes the wireless signal to obtain a block code;
203. the base station controller finds out an idle service channel, allocates the idle service channel to be a new control channel and starts to broadcast the control channel identification signaling at regular time;
204. the base station sends a channel transfer instruction under the original control channel to indicate terminals irrelevant to the call service to be transferred to a new control channel;
205. the base station controller switches the original control channel into a service channel and distributes the service channel to the current calling service for use;
206. starting to forward the current call on the current traffic channel;
207. the terminal releases the PTT key and broadcasts a busy channel identification signaling in a certain protection time at a fixed time; if no terminal presses the PTT key again within the timeout (call hold time), the call is considered to be over, and the next step 208 is performed; otherwise, returning to the previous step 206, and continuing to forward the current call;
208. when the call is finished, the service channel starts to broadcast the channel transfer instruction at fixed time;
209. all terminals are transferred to the control channel for waiting.
Fig. 2 to fig. 4 are schematic diagrams of channel scheduling states according to the preferred embodiment of the present invention; FIG. 8 is a table of mapping between control commands and simple signaling codes according to the embodiment, and FIG. 9 is a table of physical channel and terminal block codes; both of these uses hexadecimal coding.
As shown in fig. 2, there are 12 terminals divided into J, K, M3 groups; all terminals monitor on the control channel a; any terminal of the group K initiates K group calling by using the sub-tone group code 113H, any terminal of the group K can receive the group code and decode, and meanwhile, the base station can also receive the group code, and the physical channel 1 is occupied by the group K; the base station sends a busy channel identification BCI (binary coded information) which is a control instruction coded as 113H on a control channel A; the terminal to which the group K belongs does not process the code 113H of the busy channel identification signaling BCI in the secondary group call communication and its guard time; meanwhile, the base station selects any idle physical channel 4 as a new control channel B, and in the communication and protection time of the physical channel 1, the base station sends a channel transfer instruction GTC through the control channel A, wherein the channel transfer instruction has a plurality of types and corresponds to channel coding: 166H is sent if a transfer to physical channel 4 is required; need to move to physical channel 5, send 175H; the terminal of packet J, packet M, receiving the GTC command code as 166H, moves to physical channel 4, i.e. new control channel B, as shown in fig. 3.
The base station sends a code 113H of a busy channel identification BCI in a control channel A within the calling and protection time of a packet K; the base station broadcasts the GTC on the new control channel B and other idle channels at regular time, and if the GTC is transferred to the physical channel 4, the code of the GTC is 166H.
After the call ends and the guard time is exceeded, and no terminal in the group generates a new call, the terminal to which the group K belongs also receives the code 166H of the GTC instruction sent by the base station, decodes the code to obtain the physical channel 4, and transfers the physical channel 4 to a new control channel B, as shown in fig. 4.
Fig. 5 is a schematic diagram of the base station composition of the preferred embodiment of the present invention, which includes a base station controller, at least one set of channelizer, splitter, duplexer and antenna feeder system; the base station controller comprises a simple signaling coding unit; the simple signaling coding unit comprises a base station control instruction and simple signaling coding corresponding table, and the table can be used for inquiring to obtain the relation between the control instruction and the simple signaling coding; the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table, and the table can be inquired to obtain the corresponding relation between the simple signaling coding and the CDCSS or MSK signal. In many specific designs, the coding relationships in the table of fig. 7 are set in the codec chip, for example, the digital sub-tone table is included in the "analog sub-tone digital sub-tone codec chip PH 938".
The base station control instruction coding unit determines a control instruction to be sent according to a control flow when sending a base station signal, and obtains a simple signaling code corresponding to the control instruction by inquiring a base station control instruction and simple signaling code corresponding table; by looking up the digital sub-tone coding table of fig. 7, the base station obtains the CDCSS or MSK signal to be transmitted, which may be a signal of other digital modulation techniques; and the base station sends a signal to finish the dispatching operation of the trunking communication.
Because the control instruction of the embodiment of the invention is simpler, the base station does not detect the state of each terminal; the base station periodically sends a GTC command on the idle channel to let the off-line or newly powered-on terminals, which have not been transferred to the new control channel, also transfer to the current control channel. Certainly, some terminals may stay on the original control channel, that is, the traffic channel currently called by a certain packet terminal, because the GTC instruction is not received; each terminal staying in the channel cannot hear the call in the channel because there is no block code for the block terminal; and entering an idle state after the call service on the channel is finished, wherein the channel becomes an idle channel. On the idle channel, the base station will periodically send GTC instruction, so that the terminal in the off-line state can correctly transfer to the new control channel.
The terminal assembly of the embodiment of the invention is shown in fig. 6 and comprises a radio frequency circuit, a baseband, a display keyboard, a micro control system, a voice input MC unit and an output LS unit; the micro control system unit also comprises a simple signaling coding unit which comprises a control instruction and simple signaling coding corresponding table. The relation between the control command and the simple signaling code can be inquired and obtained from the table. The simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table. The terminal receives CDCSS or MSK signals sent from the base station to obtain simple signaling codes; and the terminal finishes the cluster communication operation according to the control instruction.
Based on the traditional interphone system, the invention adds a software module in each of the base station and the terminal of the conventional interphone communication system to meet the requirements of common trunking services such as channel allocation, group calling, full calling and the like; the software module for realizing the trunking function transmits the control instruction code of trunking communication through simple signaling, so that the traditional intercom system realizes the trunking communication function and can realize the distinction of a control channel and a service channel, thereby improving the utilization efficiency of a physical channel and improving the utilization ratio of wireless channel resources and equipment on the one hand; in addition, the cluster grouping is flexible, and the service types are rich; the communication method and the system have the characteristics of low cost of the conventional communication system and high resource utilization rate of the cluster communication system, and are particularly suitable for occasions which spend a small amount of money to improve the conventional equipment but can greatly improve the service performance of the conventional equipment.
FIG. 7 is a table of digital sub-phonetic codes, which can be looked up to obtain the correspondence between the digital codes and the CDCSS signals. In many specific designs, the correspondence is already set in the codec chip.
Fig. 8 is a table of control commands and simple signaling codes, where, for one command type, there may be multiple codes, e.g., multiple codes for the GTC, each corresponding to a different target channel to be transferred. In the embodiment of the invention, the channel coding is the same as the channel transfer instruction GTC, and when the transfer instruction is received, the terminal knows the target channel to be transferred at the same time. The corresponding table also gives a terminal block code, and the block code also corresponds to a group of digital sub-tones and is used for identifying a block when the terminal initiates a call and identifying a voice received by the terminal; when the terminal presses the PTT key to transmit, the base station forwards the voice and sends the block code to mark the current communication channel in the conversation state and occupy the block, and the terminal which is not the block can quickly detect the state of the terminal, quickly leave the channel and enter the current control channel; during calling, the base station issues a busy channel identification BCI for reserving the channel, indicates the newly started or offline terminal in the group to enter the service channel, and prompts the newly started or offline terminal which is not the group to switch to the current control channel.
The signaling coding in the present invention may adopt CDCSS coding, may also use MSK for coding, and may also be coding of other digital modulation techniques.
The present invention can also combine with base station controller and mobile exchange system to form large cross-area cluster calling system. The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description is specific and detailed, but not to be understood as the limitation of the scope of the invention, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, which falls into the protection scope of the present invention, and therefore, all equivalent changes and modifications made within the scope of the claims of the present invention shall fall into the coverage of the claims of the present invention.
Claims (6)
1. A simple signaling cluster communication method comprises the following steps:
firstly, the base station codes a control command into a simple signaling which simultaneously comprises channel coding;
setting codes corresponding to the simple signaling by the base station;
thirdly, modulating the code on a transmitting carrier;
receiving and demodulating by the terminal to obtain the code;
the terminal obtains a control instruction according to a control instruction preset in the terminal and the simple signaling coding corresponding table;
sixthly, the terminal completes the cluster communication operation according to the control instruction;
finishing the cluster communication operation in the step sixthly, comprising the following steps:
in idle state, all terminals wait under control channel A;
any terminal of any group K initiates a call in a control channel A and transmits the block code of the group K to a base station;
the base station receives the wireless signal sent by the terminal and decodes the wireless signal to obtain a block code;
the base station finds an idle channel and sets the idle channel as a new control channel B;
the base station sends a channel transfer instruction GTC on the original control channel A to indicate other terminals except the group K to transfer to a control channel B;
the base station controller switches the control channel A into a service channel C;
the group K calls on the traffic channel C;
after the call of the service channel C is finished, the base station starts to broadcast a channel transfer instruction GTC at the timing of the service channel C, so that all terminals are transferred to the control channel B.
2. The method of claim 1, wherein:
in step (i), the control instruction types include: a Control Channel Identification (CCI); a busy channel identification BCI; channel transfer instruction GTC.
3. The method of claim 1, wherein:
and step three, transmitting the code after the code is modulated by using a CDCSS or MSK mode.
4. The method of claim 1, wherein:
and the base station intermittently sends channel transfer instructions GTC for prompting the frequency points of the control channel on all the idle channels.
5. The method of claim 1, wherein:
and the grouping coding of the group and the channel transfer instruction GTC are wireless signaling sent periodically.
6. A simple signaling cluster communication system for implementing the simple signaling cluster communication method of claim 1, comprising a base station and a terminal; the base station comprises a base station controller, at least one set of channel machine, a branching and branching device, a duplexer and an antenna feed system; the base station controller also comprises a simple signaling coding unit, the simple signaling coding unit comprises a base station control instruction and simple signaling coding corresponding table, and the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table; the terminal comprises radio frequency circuits, a baseband, a display screen, a keyboard, units of a micro-control system and two units of voice input MC and output LS, wherein the micro-control system unit comprises a simple signaling coding unit which also comprises a control instruction and simple signaling coding corresponding table, and the simple signaling coding unit also comprises a simple signaling coding and CDCSS or MSK signal corresponding table; the terminal receives CDCSS or MSK signals sent by the base station to obtain simple signaling codes, obtains control instructions according to control instructions preset in the terminal and the simple signaling code corresponding table, and completes cluster communication operation according to the control instructions.
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| CN109429189B (en) * | 2017-07-07 | 2023-11-07 | 福建省万华电子科技有限公司 | Cluster communication system and cluster communication method adopting single-base station multi-channel cluster communication protocol |
| CN109769301A (en) * | 2019-02-13 | 2019-05-17 | 北京中兴高达通信技术有限公司 | The processing method and processing device of channel, electronic device |
| CN112383930B (en) * | 2020-11-12 | 2022-06-21 | 东方通信股份有限公司 | Method for distributing same-frequency simulcasting carrier |
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| CN104955000B (en) | 2018-10-02 |
| CN104955000A (en) | 2015-09-30 |
| CN108924769A (en) | 2018-11-30 |
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