CN111194025B - Multi-hop communication method, terminal, BS equipment and system - Google Patents
Multi-hop communication method, terminal, BS equipment and system Download PDFInfo
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- CN111194025B CN111194025B CN202010276155.3A CN202010276155A CN111194025B CN 111194025 B CN111194025 B CN 111194025B CN 202010276155 A CN202010276155 A CN 202010276155A CN 111194025 B CN111194025 B CN 111194025B
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Abstract
The application discloses a method, a terminal, BS equipment and a system for multi-hop communication, which comprise n communication terminals with frequencies of F1 and F2 … … Fn and a plurality of BS equipment, wherein the frequency of each communication terminal comprises two time slots of _1 and _2, and each BS equipment and the communication terminals form a unit communication network; the communication between the communication terminal and the BS equipment in each unit communication network and the communication between the BS equipment and the BS equipment between the unit communication networks are realized by any one of the following two ways: realizing one-time jump communication only by the frequency of the communication terminal and the time-frequency combination of a certain time slot in the two time slots _1 and _ 2; or the one-time jump communication is realized by the time-frequency combination of the communication terminal frequency and the time slot _1 or the time slot _ 2. The invention realizes multi-hop by frequency division and time division combination; the frequency and time slot to be used by the next hop is determined by the information of the number of hops carried by voice and data.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method, a terminal, a BS device, and a system for multi-hop communication.
Background
In some emergency environments, the underlying communication infrastructure may have been breached or an underlying communication network, such as a wired IP network, may not be deployed. In order to solve the communication demand in the emergency environment, a portable BS device and a mobile terminal are required, but since there is no wired network, an emergency communication network with a large coverage cannot be formed between the devices through the wired network. In PDT \ DMR emergency communication, the currently mainstream solution is to connect each portable BS device and mobile terminal by wireless transmission. A single portable BS device can forward a terminal signal once, expanding the communication range. However, if a larger communication range is required and the coverage of one portable BS device cannot be satisfied, a plurality of portable BS devices need to be wirelessly connected to form a wireless multi-hop communication network with a larger coverage.
Prior art 1 (CN 104320364A) proposes a method of connecting a plurality of portable BS devices; prior art 2 (CN 110351671A) proposes a method for networking and forwarding by a predetermined frequency; prior art 3 (CN 109698717A) proposes a method for connecting two relay stations.
However, the above technique has the following problems:
In the prior art 3, the communication frequency between the terminal and the relay station is different from the communication frequency between the relay stations, which wastes frequency resources and only can realize wireless connection between two relay stations.
Disclosure of Invention
In order to solve the problem that multi-hop networking of a mobile station cannot be realized in the prior art, the application provides a multi-hop communication method, a terminal, BS equipment and a system.
In a first aspect, an embodiment of the present application provides a multi-hop communication method, where communication between a communication terminal and a BS device in each cell communication network and communication between the BS device and the BS device between the cell communication networks implement communication in any one of the following two ways: realizing one-time jump communication by using the time-frequency combination of one of n frequencies and one of two time slots _1 and _ 2; or one-hop communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2.
Preferably, the communication between the communication terminal and the BS device in each cell communication network, and the communication between the BS device and the BS device between the cell communication networks specifically include:
the time-frequency combination of one of the n frequencies and one of the two time slots _1 and _2 is used to realize one-time jump communication: the n frequencies F1, F2 … … Fn and two time slots of _1 and _2 form 2n time-frequency combinations, wherein the head-end communication terminal realizes the first jump communication with the head-end BS device by the time-frequency combination of one frequency and one time slot of _1 and _ 2; all the devices between the head-end BS device and the tail-end BS device have 2n-2 times of jump communication, and the jump communication of all the devices between the head-end BS device and the tail-end BS device is realized by the frequency of the rest n-1 communication terminals and the 2n-2 time-frequency combination of two time slots of _1 and _ 2; the skip communication between the terminal BS equipment and the terminal communication terminal is realized by the time-frequency combination of the frequency of the remaining communication terminal and the time slot of the communication terminal;
realizing one-time jump communication by one of n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2: the n frequencies F1, F2 … … Fn and the time slots of _1 and _2 form n communication time-frequency combinations, wherein the head-end communication terminal realizes first-time jump communication with the head-end BS equipment by the time-frequency combination of one frequency and the time slots of _1 and _ 2; all equipment between the head end BS equipment and the tail end BS equipment has n-2 times of jump communication, and the jump communication of all the equipment between the head end BS equipment and the tail end BS equipment is realized by the frequency of the rest n-2 communication terminals and the n-2 time-frequency combination of the two time slots of the _1 or the _ 2; the hopping communication between the end BS device and the end communication terminal is implemented with the remaining one communication terminal frequency and the time-frequency combination of the two time slots 1 and 2.
Preferably, the communication information carried by the time-frequency combination has a repeated voice header or repeated communication data.
Preferably, the repeated voice header, voice or repeated communication data of the time-frequency combination carry field identifiers, which identify that the current time-frequency combination is the hop of the second time.
Preferably, the repeated voice header, voice or repeated communication data of the time-frequency combination carries a field identifier, which identifies the current time slot number, and the time slot number is combined with the transmitting frequency to make the time-frequency combination clear as the jump.
Preferably, the head-end communication terminal and the tail-end communication terminal are communication terminals or BS devices.
Preferably, 2n or n time-frequency combinations of the n frequency and time slots can be reused.
Preferably, the BS device in the per-cell communication network implements multi-level data hopping on one frequency by store-and-forward communication data.
In a second aspect, an embodiment of the present application further provides a multi-hop communication terminal, where the communication terminal is configured to implement one-hop communication with a time-frequency combination of one of n frequencies and one of two slots _1 and _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the communication terminal comprises a receiving module, a signal processing module and a sending module.
Preferably, the communication terminal implements one-time hopping communication with a time-frequency combination of one of the n frequencies and one of the two time slots _1 and _2, specifically:
a sending module of the head-end communication terminal sends a radio frequency signal by time-frequency combination of one frequency and one time slot in the _1 and the _2, and realizes first skip communication with the head-end BS equipment;
after 2n-2 times of skip communication of all the devices between the head-end BS device and the tail-end BS device is completed, a receiving module of the tail-end communication terminal receives a radio frequency signal which is sent by the tail-end BS device by the time-frequency combination of the frequency of the remaining communication terminal and the time slot of the remaining communication terminal;
wherein the n frequencies F1, F2 … … Fn and the _1 and _2 slots form 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
Preferably, the communication terminal implements one-time hopping communication with one of the n frequencies and a time-frequency combination of the time slot _1 and the time slot _2, specifically:
a sending module of the head-end communication terminal sends a radio frequency signal by time-frequency combination of one frequency and two time slots of _1 and _2, and realizes first-time skip communication with the head-end BS equipment;
after n-2 times of jump communication of all devices between the head end BS device and the tail end BS device is completed, a receiving module of the tail end communication terminal receives a radio frequency signal which is sent by the tail end BS device in a time-frequency combination of the remaining communication terminal frequency and two time slots of _1 and _ 2;
wherein the n frequencies F1, F2 … … Fn and _1, _2 two time slots constitute n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
In a third aspect, an embodiment of the present application further provides a multi-hop communication BS device, where the BS device is configured to implement one-hop communication with a time-frequency combination of one of n frequencies and one of two time slots _1 and _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the BS equipment comprises a receiving module, a signal processing module and a transmitting module.
Preferably, the BS device implements one-time hopping communication with a time-frequency combination of one of the n frequencies and one of the two time slots _1 and _2, specifically:
a receiving module of the head end BS equipment receives a radio frequency signal sent by the head end communication terminal through a time-frequency combination of one time slot in one frequency opinion _1 and one time slot _2 of the head end communication terminal, and realizes first skip communication with the head end communication terminal;
the head end BS equipment and the tail end BS equipment realize 2n-2 skip communication through a sending module and a receiving module thereof;
after 2n-2 times of skip communication of all the devices between the head-end BS device and the tail-end BS device is completed, a sending module of the tail-end BS device sends a radio frequency signal to the tail-end communication terminal by the time-frequency combination of the frequency and the time slot of the remaining communication terminal;
wherein the n frequencies F1, F2 … … Fn and two time slots of _1 and _2 constitute 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
Preferably, the BS device implements one-time hopping communication with one of the n frequencies and a time-frequency combination of the time slot _1 and the time slot _2, specifically:
a receiving module of the head end BS equipment receives a radio frequency signal sent by a head end communication terminal by a time-frequency combination of one frequency and two time slots of _1 and _2, and realizes first skip communication with the head end communication terminal;
the head end BS equipment and the tail end BS equipment realize n-2 skip communication through a sending module and a receiving module of the head end BS equipment and the tail end BS equipment;
after n-2 times of jump communication of all the devices between the head end BS device and the tail end BS device is completed, a sending module of the tail end BS device sends a radio frequency signal to the tail end communication terminal by the time-frequency combination of the remaining communication terminal frequency and the two time slots of _1 and _ 2;
wherein the n frequencies F1, F2 … … Fn and _1, _2 two time slots constitute n time-frequency combinations; the signal processing module is used for controlling the sending of the radio frequency signals in any time-frequency combination or analyzing and processing the received radio frequency signals.
In a fourth aspect, an embodiment of the present application further provides a multi-hop communication system, including n communication terminals and a plurality of BS devices, where a frequency of each communication terminal includes two time slots — 1 and — 2, where each BS device and the communication terminal form a unit communication network, the communication terminal in each unit communication network communicates with the BS device, and the communication between each unit communication networks is forwarded through the BS device.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
the invention provides a method which can realize multi-hop by a communication mechanism that PDT \ DMR has only two time slots in one channel and realize multi-hop by frequency division and time division combination; the ordered jump is achieved through the information of the number of hops carried by voice and data or the current time slot number; saving frequency resources by sharing frequencies of the BS and the mobile terminal; for a small amount of data communication, multi-level data jump communication can be realized on one communication frequency through data store-and-forward.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram illustrating a principle of a connection method of multiple portable BS devices proposed in CN104320364A in the prior art;
fig. 2 is a schematic diagram of a networking and forwarding method by a pre-agreed frequency proposed by CN110351671A in the prior art;
fig. 3 is a schematic diagram of a method for connecting two relay stations according to CN109698717A in the prior art;
fig. 4 is a schematic diagram illustrating a communication principle of a terminal and a mobile BS among a network a, a network B and a network C in the prior art;
FIG. 5 is a schematic diagram of a first embodiment of the present invention;
fig. 6 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a schematic diagram of a connection method for multiple portable BS devices proposed in CN104320364A in the prior art is shown. The number of hops of the connection method of the plurality of portable BS devices depends on how many time slots are on one channel, for example, a protocol of 4 time slots can realize 3 hops. For PDT \ DMR protocol, only two time slots are needed for one channel, and then only single-hop, namely single-relay coverage can be realized. The invention provides a relay method for wireless communication and a relay device for wireless communication, which realize multi-hop multi-point mesh relay among wireless communication nodes. The method of the embodiment of the invention pre-corrects the carrier frequency offset and the timing frequency offset, so that one or more nodes meeting the relay condition can simultaneously relay signals from the same transmitting node or relay node, and a receiving node can combine a plurality of relay signals without interference, thereby greatly improving the wireless communication distance and ensuring the quality or reliability of the relay.
As shown in fig. 2, a schematic diagram of a networking and forwarding method by a pre-agreed frequency is proposed for the CN110351671A in the prior art. The scheme provides a method for networking and forwarding through a predetermined frequency, wherein a first base station receives a first transmitting signal of an interphone; the first base station analyzes the first transmission signal, and if the first transmission signal is matched with the first setting signal, the first base station transmits a second transmission signal to the second base station. And the second base station analyzes the second transmitting signal, and if the second transmitting signal is matched with the second setting signal, the second base station transmits a third transmitting signal to a third base station or an interphone. And the third base station analyzes the third transmitting signal, and if the third transmitting signal is matched with the third setting signal, the third base station transmits a fourth transmitting signal to the interphone. The invention has the advantages of improving the utilization of the dual-frequency band of the base station and realizing dual-frequency switching networking, thereby enlarging the communication coverage.
Fig. 3 shows a schematic diagram of a method for connecting two relay stations, which is proposed in CN109698717A in the prior art. The scheme relates to the technical field of communication, and provides a networking method, a relay station and a system for common-frequency and simulcast of the relay station, wherein the method comprises the following steps: the first relay station sets a first time slot as a working time slot and sets a second time slot as an interconnection time slot with at least one other relay station; a group of double frequency points is set, and the double frequency points comprise an uplink frequency (F1) and a downlink frequency (F2); the first relay station receives data sent by the mobile terminal in an uplink frequency working time slot (F1-1) and forwards the data to other relay stations in an uplink frequency interconnection time slot (F1-2); all the relay stations transmit data to the mobile terminals under their coverage in a unified downlink frequency working time slot (F2-1). According to the technical scheme, the common-frequency simulcasting interconnection among the relay stations can be realized without increasing hardware equipment or occupying independent frequency resources, the networking is simple and reliable, and the actual communication technical requirements can be met.
However, the above technique has the following problems:
prior art 1 (CN 104320364A) proposes a method for connecting multiple portable BS devices, where the number of hops depends on how many timeslots are on one channel, for example, a 4-timeslot protocol can implement 4 hops. For PDT \ DMR protocol, only two time slots are needed for one channel, and then only single-hop, namely single-relay coverage can be realized.
Prior art 2 (CN 110351671A) proposes a method for networking and forwarding through a pre-agreed frequency, which cannot be networked under a mobile station.
In the prior art 3 (CN 109698717A), the communication frequency between the terminal and the relay station is different from the communication frequency between the relay stations, which wastes frequency resources and only realizes wireless connection between two relay stations.
The embodiment of the application provides a multi-hop communication method, wherein communication between a communication terminal and BS equipment in each unit communication network and communication between the BS equipment and the BS equipment between the unit communication networks are realized by any one of the following two ways: one-time jump communication is realized by the time-frequency combination of one of n frequencies and one time slot of two time slots _1 and _ 2; or one-hop communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2.
The communication between the communication terminal and the BS device in each cell communication network, and the communication between the BS device and the BS device between the cell communication networks are specifically:
the time-frequency combination of one of the n frequencies and one of the two time slots _1 and _2 is used to realize one-time jump communication: n frequencies F1, F2 … … Fn and two time slots of _1 and _2 form 2n time-frequency combinations, wherein the first-time skip communication is realized between the first-end communication terminal and the first-end BS equipment by the time-frequency combination of the frequency and one time slot of _1 and _ 2; all the devices between the head-end BS device and the tail-end BS device have 2n-2 times of jump communication, and the jump communication of all the devices between the head-end BS device and the tail-end BS device is realized by 2n-2 times of time-frequency combination of the rest n-1 communication terminal frequencies and the two time slots of _1 and _ 2; the skip communication between the terminal BS equipment and the terminal communication terminal is realized by the time-frequency combination of the frequency of the remaining communication terminal and the time slot of the communication terminal;
realizing one-time jump communication by one of n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2: n frequency F1, F2 … … Fn and two time slots of _1 and _2 form n communication time-frequency combinations, wherein the head-end communication terminal realizes the first jump communication with the head-end BS equipment by the time-frequency combination of the two time slots of _1 and _2 of the frequency; all equipment between the head end BS equipment and the tail end BS equipment has n-2 times of jump communication, and the jump communication of all the equipment between the head end BS equipment and the tail end BS equipment is realized by n-2 time-frequency combinations of the frequencies of the rest n-2 communication terminals and the two time slots of the _1 time slot or the _2 time slot of the frequencies; the hopping communication between the end BS device and the end communication terminal is implemented with the remaining one communication terminal frequency and the time-frequency combination of the two time slots 1 and 2.
The communication information carried by the time-frequency combination comprises a repeated voice head or repeated communication data, the voice head, voice or communication data carrying field of the time-frequency combination identifies the current time-frequency combination as the jump of the number of times, the voice head, voice or communication data carrying field of the time-frequency combination identifies the current time slot number, and the time slot number is combined with the transmitting frequency to determine that the time-frequency combination is the jump of the number of times.
In addition, the head-end communication terminal and the tail-end communication terminal may be either terminals or BS devices. The 2n or n time-frequency combinations of n frequencies and time slots can be reused. The BS device in each unit communication network realizes multi-level data jumping on one frequency by storing and forwarding communication data.
Meanwhile, the invention also provides a multi-hop communication terminal, which is used for realizing one-time hop communication by one frequency of n frequencies and the time-frequency combination of a certain time slot of two time slots _1 and _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the communication terminal comprises a receiving module, a signal processing module and a sending module.
The communication terminal realizes one-time jump communication by using one of n frequencies and the time-frequency combination of a certain time slot of two time slots _1 and _2, and specifically comprises the following steps: a sending module of the head-end communication terminal sends radio frequency signals by time-frequency combination of a certain time slot of a certain frequency of the sending module and a certain time slot of a certain frequency of the sending module, and first skip communication is realized between the sending module and the head-end BS equipment; after 2n-2 times of skip communication of all the devices between the head-end BS device and the tail-end BS device is completed, a receiving module of the tail-end communication terminal receives a radio frequency signal which is sent by the tail-end BS device by the time-frequency combination of the frequency of the remaining communication terminal and the time slot of the remaining communication terminal; n frequencies F1, F2 … … Fn and 2 time slots of _1 and _2 form 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
Meanwhile, the communication terminal realizes one-time jump communication by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _2, and specifically comprises the following steps: a sending module of the head-end communication terminal sends a radio frequency signal by time-frequency combination of two time slots of '1' and '2' of a certain frequency, and realizes first skip communication with the head-end BS equipment; after n-2 times of jump communication of all devices between the head end BS device and the tail end BS device is completed, a receiving module of the tail end communication terminal receives a radio frequency signal sent by the tail end BS device in a time-frequency combination of two time slots of '1' and '2' of the frequency of the remaining communication terminal; wherein, n frequencies F1, F2 … … Fn and two time slots of _1 and _2 form n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
The invention also provides a multi-hop communication BS device, wherein the BS device is used for realizing one-time hop communication by one of n frequencies and the time-frequency combination of a certain time slot in two time slots _1 and _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the BS device includes a receiving module, a signal processing module and a transmitting module.
The BS device implements one-time hopping communication with one of n frequencies and a time-frequency combination of a certain time slot of two time slots _1 and _2, specifically: a receiving module of the head end BS equipment receives a radio frequency signal sent by the head end communication terminal in a time-frequency combination of a certain time slot of a certain frequency of 1 and 2, and realizes first skip communication with the head end communication terminal; the head end BS equipment and the tail end BS equipment realize 2n-2 skip communication through a sending module and a receiving module thereof; after 2n-2 times of skip communication of all the devices between the head-end BS device and the tail-end BS device is completed, a sending module of the tail-end BS device sends a radio frequency signal to the tail-end communication terminal by using the time-frequency combination of the frequency of the remaining communication terminal and the time slot of the remaining communication terminal; wherein, two time slots of n frequencies F1 and F2 … … Fn and _1 and _2form 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
Meanwhile, the BS device implements one-time hopping communication with one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _2, specifically: a receiving module of the head end BS equipment receives a radio frequency signal sent by the head end communication terminal by the time-frequency combination of two time slots of '1' and '2' of a certain frequency, and realizes first skip communication with the head end communication terminal; the head end BS equipment and the tail end BS equipment realize n-2 skip communication through a sending module and a receiving module of the head end BS equipment and the tail end BS equipment; after n-2 times of jump communication of all the devices between the head end BS device and the tail end BS device is completed, a sending module of the tail end BS device sends a radio frequency signal to the tail end communication terminal by the time-frequency combination of two time slots of _1 and _2 of the frequency of the remaining communication terminal; wherein, n frequencies F1, F2 … … Fn and two time slots of _1 and _2 form n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
As shown in fig. 5 and 6, the present invention further provides a multi-hop communication system, which includes n communication terminals and a plurality of BS devices, wherein each communication terminal has a frequency including two time slots — 1 and — 2, each BS device and the communication terminal form a unit communication network, the communication terminal and the BS device in each unit communication network communicate with each other, and each unit communication network forwards the communication through the BS device.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example one
In some emergency environments, the underlying communication infrastructure may have been breached or an underlying communication network, such as a wired IP network, may not be deployed. In order to solve the communication demand in the emergency environment, a portable BS device and a mobile terminal are required, but since there is no wired network, an emergency communication network with a large coverage cannot be formed between the devices through the wired network. As shown in fig. 4, the mobile BS and the terminal between the a network, the B network, and the C network cannot communicate with each other, and constitute a large communication network.
The present embodiment attempts to solve the problem in the scenario of fig. 4, as shown in fig. 5:
as shown in fig. 5, a 4-hop ad hoc network is achieved by frequency division multiplexing and two time slots, where F1, F2 represent two different frequencies and _1 and _2 represent two time slots. The terminal goes up through F1_1 (slot 1 of frequency F1) (F1 _1 is said time-frequency combination), BS1 forwards the data to the terminal and BS2 through F2_ 2; after receiving the rf signal through F2_2, the BS2 forwards the rf signal to the terminal and BS3 through F1_2 (F1 _2 is the time-frequency combination); after receiving the rf signal through F1_2, the BS3 forwards the rf signal to the last terminal through F2_ 1. Of course, other combinations of F1_1, F1_2, F2_1, F2_2 may be implemented. Further, the combination of F1_1, F1_2, F2_1, F2_2 may be reused, such as two times for 8 hops. In addition, the frequency can be increased to realize more hops, such as 6 hops through F1, F2 and F3.
Taking fig. 5 as an example, considering the mobility of the BS and the terminal, each terminal and the BS may receive one of F1_1, F1_2, F2_1 and F2_2 or may receive multiple signals in the overlapping area of the signals, and then the BS and the terminal need to scan between F1 and F2, and for PDT \ DMR voice communication, select a signal with correct decoding (for example, capable of correctly decoding a voice header) for forwarding or receiving. The originator of voice or data may send one or two packets of voice header or data more, considering that the BS or terminal may lose one or two packets of signal in the scanning state, and the BS may send one or two packets of voice header or data more if one or two packets of voice header or data are lost.
Taking fig. 5 as an example, in order to ensure that F1_1, F1_2, F2_1, and F2_2 can be used in order, a certain combination is not repeatedly used in a single cycle of F1_1, F1_2, F2_1, and F2_2 to cause interference, for example, the third hop F1_2 in fig. 5 is received by BS3 and is not forwarded by F2_2 to cause interference to BS2, so that it is necessary to identify that the current hop is the several hop in voice or data. In the forwarding sequence shown in fig. 5, F1_1 is the first hop, F2_2 is the second hop, F1_2 is the third hop, and F2_1 is the fourth hop, which can be identified in the voice header or embedded voice header field, as shown in table 1, for example, in the group call voice of PDT \ DMR protocol. There is an so (service options) field in the voice header or embedded voice header, and the contents of this field are shown in table 2.
As shown in Table 2, there is a reserved 2-bit field, 0-3 corresponding to 1-4 hops, respectively. When the terminal sends the first hop voice at F1_1, the reserved field value of 00 represents the first hop, which is also the default value filled by the standard PDT \ DMR protocol and therefore compatible with the standard terminal. When the BS receives F1_1 first hop, it forwards through F2_2, and the reserved field value 1 represents the second hop, and so on. When the BS receives the voice header or the embedded voice header with the reserved field value of 3, that is, the fourth hop, it is found that the fourth hop is the last hop and is not forwarded or reused from F1_1 again. In addition, slot 1 may be represented by 00, and slot 2 may be represented by 01, and the BS may know which time-frequency combination according to the current receiving frequency and slot number. Of course, it is within the scope of the present invention to add identification to other fields of voice or data.
Because more than 1 frequency is used for communication in 4 hops or more, the BS and the mobile terminal are required to scan signals between two or more frequency points. For small data traffic, a scheme is proposed herein that does not require scanning. For a small amount of data, by store-and-forward, for example, the terminal sends data to BS _1 through F1_1, and after the terminal such as BS _1 sends the data, the data is forwarded to BS _2 through F1_2, because the terminal has sent the data and does not transmit any more, after receiving the data forwarded by BS _1, BS _2 may forward the data through F1_1, and similarly, BS _3 forwards the data through F1_2, so that both BS and mobile terminal do not need to perform scanning.
Example two
As shown in fig. 6, the terminal calls at F1_1 or F1_2, and BS1 receives the call and forwards the call through F2_1 or F2_ 2; after receiving the F2_1 or F2_2, the BS2 forwards the data through the F3_1 or F3_ 2. Of course, other combinations of F1, F2 and F3 may be implemented, for example, downlink of BS1 may be F3, and downlink of BS2 may be F2. In addition, the frequency can be increased to realize more hops, such as 4 hops through F1, F2, F3, and F4. In addition, the time-frequency combination can be repeatedly used to reach more hop counts.
Compared to the first embodiment, the advantage is that simultaneous two-way calls can be supported, the disadvantage is that more frequency resources are required.
Taking fig. 6 as an example, considering mobility of the BS and the terminal, the terminal may receive one of F2 or F3 or may receive multiple signals in an overlapping region of the signals, the BS may receive one of F1 or F3 or may receive multiple signals in an overlapping region of the signals, and the terminal needs to scan between F2 and F3; the BS needs to scan between F1 and F2. For PDT \ DMR voice communication, a signal capable of decoding (such as a voice header capable of decoding) is selected to be transmitted or received. The originator of voice or data may send one or two more packets of data considering that the BS or the terminal may lose one or two packets of signals in the scanning state, and the BS may send one or two more packets of data if one or two packets of signals are lost.
Taking fig. 6 as an example, in order to ensure that F1, F2, and F3 can be used in order, interference caused by repeated use in a single loop of F1, F2, and F3, for example, interference caused by forwarding of F1 after the second hop F2 in fig. 6 is received by BS2, then the BS determines the frequency of receiving the previous hop, and forwards the previous hop at the preset frequency of the next hop, without identifying that the current hop is the next hop in voice or data.
Taking fig. 6 as an example, single frequency point forwarding may be implemented by storing and forwarding data, so that the BS and the mobile terminal do not need to perform scanning any more.
In summary, the present invention provides a method that enables a PDT \ DMR, which is a communication mechanism with only two timeslots, to implement multi-hop, and implement multi-hop by frequency division and time division; interference caused by disorder of multiple hops is avoided through the voice and the hop information carried by the data; saving frequency resources by sharing frequencies of the BS and the mobile terminal; for a small amount of data communication, multi-level data jump communication can be realized on one communication frequency through data store-and-forward. Any similar method to the present invention is included in the protection points of the present invention.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (12)
1. A multi-hop communication method is characterized in that communication between a communication terminal and a BS device in each unit communication network and communication between the BS device and the BS device between the unit communication networks are realized by any one of the following two ways: realizing one-time jump communication by using one frequency of n frequencies and the time-frequency combination of one time slot of two time slots _1 and _2 to form 2n time-frequency combinations; or one time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _2 to form n time-frequency combinations;
the communication information carried by the time-frequency combination comprises a repeated voice head, voice or repeated communication data and carries field identification, the identification of the current time-frequency combination is the jump for the second time, and the communication information is used for preventing a certain time-frequency combination from being repeatedly used to cause interference in a single jump communication cycle;
the 2n or n time-frequency combinations of the n frequencies and time slots can be reused.
2. The multi-hop communication method according to claim 1, wherein the communication between the communication terminal and the BS device in each cell communication network, and the communication between the BS device and the BS device in the cell communication network, specifically:
the time-frequency combination of one of the n frequencies and one of the two time slots _1 and _2 thereof to realize one-time jump communication comprises the following steps: the n frequencies F1, F2 … … Fn and two time slots of _1 and _2 form 2n time-frequency combinations, wherein the head-end communication terminal realizes the first jump communication with the head-end BS device by the time-frequency combination of one frequency and one time slot of _1 and _ 2; all the devices between the head end BS device and the tail end BS device have 2n-2 times of jump communication, and the jump communication of all the devices between the head end BS device and the tail end BS device is realized by 2n-2 times of time-frequency combination of the rest n-1 frequencies and the two time slots of _1 and _ 2; the skip communication between the terminal BS equipment and the terminal communication terminal is realized by the time-frequency combination of the remaining frequency and the time slot thereof;
one-time jump communication is realized by one of n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2: the n frequencies F1, F2 … … Fn and the time slots of _1 and _2 form n communication time-frequency combinations, wherein the head-end communication terminal realizes first-time jump communication with the head-end BS equipment by the time-frequency combination of one frequency and the time slots of _1 and _ 2; all equipment between the head end BS equipment and the tail end BS equipment has n-2 times of jump communication, and the jump communication of all the equipment between the head end BS equipment and the tail end BS equipment is realized by n-2 time-frequency combinations of the rest n-2 frequencies and the two time slots of _1 or _ 2; the hopping communication between the end BS device and the end communication terminal is implemented with the remaining one frequency and the time-frequency combination of two slots 1 and 2.
3. The multi-hop communication method according to claim 1, wherein the repeated speech header, speech or repeated communication data of the time-frequency combination carries a field identification identifying the current time slot number, the time slot number in combination with the transmission frequency defining the time-frequency combination as a hop.
4. The multi-hop communication method as claimed in claim 2, wherein the head-end communication terminal and the tail-end communication terminal are communication terminals or BS devices.
5. The multi-hop communication method of claim 2, wherein the BS device in each cell communication network implements multi-level data hopping on one frequency by store-and-forward communication data.
6. A multi-hop communication terminal, for use in the method according to any one of claims 1 to 5, wherein the communication terminal is configured to implement one-hop communication with a time-frequency combination of one of n frequencies and one of two time slots _1, _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the communication terminal comprises a receiving module, a signal processing module and a sending module.
7. The multi-hop communication terminal of claim 6, wherein the communication terminal implements one-hop communication with a time-frequency combination of one of n frequencies and one of two slots _1 and _2, and specifically:
a sending module of the head-end communication terminal sends a radio frequency signal by time-frequency combination of one frequency and one time slot in the _1 and the _2, and realizes first skip communication with the head-end BS equipment;
after 2n-2 times of skip communication of all the devices between the head-end BS device and the tail-end BS device is completed, a receiving module of the tail-end communication terminal receives a radio frequency signal which is sent by the tail-end BS device in a time-frequency combination of the remaining frequency and a time slot;
wherein the n frequencies F1, F2 … … Fn and the _1 and _2 slots form 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
8. The multi-hop communication terminal of claim 6, wherein the communication terminal implements one-hop communication with one of n frequencies and a time-frequency combination of timeslot _1 and timeslot _2, and specifically:
a sending module of the head-end communication terminal sends a radio frequency signal by time-frequency combination of one frequency and two time slots of _1 and _2, and realizes first-time skip communication with the head-end BS equipment;
after n-2 times of jump communication of all devices between the head end BS device and the tail end BS device is completed, a receiving module of the tail end communication terminal receives a radio frequency signal which is sent by the tail end BS device in a time-frequency combination of the remaining frequency and two time slots of _1 and _ 2;
wherein the n frequencies F1, F2 … … Fn and _1, _2 two time slots constitute n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
9. A multi-hop communication BS device, for use in the method of any one of claims 1 to 5, wherein the BS device is configured to implement one-hop communication with a time-frequency combination of one of n frequencies and one of two slots _1, _ 2; or one-time jump communication is realized by one of the n frequencies and the time-frequency combination of the time slot _1 and the time slot _ 2; the BS equipment comprises a receiving module, a signal processing module and a transmitting module.
10. The BS apparatus of claim 9, wherein the BS apparatus implements one-hop communication with a time-frequency combination of one of n frequencies and one of two slots _1, _2, and specifically:
a receiving module of the head end BS equipment receives a radio frequency signal sent by a head end communication terminal by a time-frequency combination of one frequency and one time slot in the _1 and the _2, and realizes first skip communication with the head end communication terminal;
the head end BS equipment and the tail end BS equipment realize 2n-2 skip communication through a sending module and a receiving module thereof;
after 2n-2 skip communications of all devices between the head-end BS device and the tail-end BS device are completed, a sending module of the tail-end BS device sends radio frequency signals to a tail-end communication terminal by using a time-frequency combination of the remaining frequency and a time slot of the remaining frequency;
wherein the n frequencies F1, F2 … … Fn and two time slots of _1 and _2 constitute 2n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
11. The BS device of claim 9, wherein the BS device implements one-hop communication with one of n frequencies and a time-frequency combination of timeslot _1 and timeslot _2, and specifically:
a receiving module of the head end BS equipment receives a radio frequency signal sent by a head end communication terminal by a time-frequency combination of one frequency and two time slots of _1 and _2, and realizes first skip communication with the head end communication terminal;
the head end BS equipment and the tail end BS equipment realize n-2 skip communication through a sending module and a receiving module of the head end BS equipment and the tail end BS equipment;
after n-2 times of jump communication of all the devices between the head end BS device and the tail end BS device is completed, a sending module of the tail end BS device sends a radio frequency signal to a tail end communication terminal by a time-frequency combination of the remaining frequency and two time slots of _1 and _ 2;
wherein the n frequencies F1, F2 … … Fn and _1, _2 two time slots constitute n time-frequency combinations; the signal processing module is used for controlling the transmission of radio frequency signals in a certain time frequency combination or analyzing and processing the received radio frequency signals.
12. A multi-hop communication system, for use in the method of any one of claims 1 to 5, wherein each BS device and the communication terminal form a cellular communication network, the communication terminals in the cellular communication network communicate with the BS device, and the cellular communication network forwards the communication through the BS device.
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