CN116209045B - Communication system - Google Patents
Communication system Download PDFInfo
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- CN116209045B CN116209045B CN202310473938.4A CN202310473938A CN116209045B CN 116209045 B CN116209045 B CN 116209045B CN 202310473938 A CN202310473938 A CN 202310473938A CN 116209045 B CN116209045 B CN 116209045B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
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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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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a communication system, which comprises at least one transmitting end and at least one receiving end communicated with the at least one transmitting end, wherein each receiving end comprises: a receiving module, configured to receive, in an awake mode, a preamble data frame including address information transmitted from a transmitting end; the matching control module is connected with the receiving module and used for controlling the receiving module to receive the data packet transmitted by the transmitting end after the preamble data frame is received when the address information accords with a preset receiving rule; and when the address information does not accord with the preset receiving rule, controlling the receiving module to enter a sleep mode. The beneficial effects are that: the invention adds address information in the preamble data frame, so that the receiving end judges whether to receive the data packet in the stage of receiving the preamble, and the receiving end which does not accord with the address information does not receive the data packet and enters the sleep mode, thereby solving the problem of furthest reducing the system power consumption.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communications system.
Background
As one of the main communication technologies of the internet of things, the wireless communication technology is increasingly widely applied, so that in the increasingly wide application of the wireless communication technology, high requirements are put on low power consumption, long-distance transmission and the like of a wireless communication system. In star networking, a gateway sends a data packet, a node receives the data packet, different nodes are distinguished by using different address information, and the node normally receives the data packet for the address information conforming to the address of the node; for address information which does not accord with the address of the node, the node does not receive data and enters a sleep mode, so that the power consumption of the node end is reduced.
However, in the prior art, because the address information is located in the data segment where the payload (payload) after the preamble (preamble) is located, all nodes must receive the address information in the payload data segment completely after receiving the preamble, then determine whether to receive the data packet, and for the nodes where the address information is not consistent, the receiving cannot be stopped until the payload stage, and a large amount of power consumption is consumed.
In the existing communication system, a large number of chirp signals are generally adopted as a preamble, and the duration of one chirp signal is specifically related to the frequency spectrum width and the spreading factor, the larger the spreading factor is, the larger the data volume is, and the longer the duration is; in addition, the narrower the frequency spectrum occupied by the chirp signal, the lower the transmission rate and the longer the transmission time.
Particularly in low-power networking application, as the node end is dormant for most of the time, in order to ensure that the node end can successfully receive the data packet issued by the gateway after being awakened, the use quantity of linear frequency modulation signals in the transmitting signals output by the gateway is often increased, so that the duration of a preamble is overlong, and sometimes even exceeds 1 second; moreover, for the node, the reception will be stopped only when the address information is detected to be unmatched after the node is awakened, and a quite long unnecessary working time will be generated for the node with unmatched address, and in addition, the longer the working time of the receiving node is, the more power consumption will be consumed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a communication system.
The technical problems solved by the invention can be realized by adopting the following technical scheme: a communication system comprising at least one transmitting end and at least one receiving end in communication with the at least one transmitting end, each of the receiving ends comprising: a receiving module, configured to receive, in an awake mode, a preamble data frame including address information transmitted from the transmitting end; the matching control module is connected with the receiving module and is used for controlling the receiving module to receive the data packet transmitted by the transmitting end after the preamble data frame is received when the address information accords with a preset receiving rule; and controlling the receiving module to enter a sleep mode when the address information does not accord with the preset receiving rule.
Preferably, the receiving module includes: and the demodulation unit is used for demodulating the address information after receiving the address information and outputting the demodulated address information to the matching control module.
Preferably, each receiving end is preset with a receiving end address; the preset receiving rule is that the received address information is matched with the address of the receiving end.
Preferably, the matching control module includes: and the first control unit is used for controlling the receiving module to enter the wake-up mode after dormancy for a preset dormancy time before the preamble data frame is received completely so as to receive the data packet when the address information accords with the preset receiving rule and the receiving end is in a preset packet receiving mode.
Preferably, the matching control module further comprises: and the second control unit is used for controlling the receiving end to enter the sleep mode after receiving and demodulating the data packet when the receiving end is not in the preset packet receiving mode.
Preferably, the preset sleep time is a remaining reception time of the preamble data frame.
Preferably, the matching control module further comprises: and the calculating unit is used for calculating the residual receiving time of the preamble data frame according to the position of the address information currently demodulated in the preamble data frame and the residual packet number of the preamble data frame when the receiving end is in the preset packet receiving mode.
Preferably, the preamble data frame includes at least one basic unit, each basic unit includes a plurality of packets, each packet including a preamble and at least one address information; the remaining number of packets of the data frame is the number indicated by the address information of the last packet of the base unit that has been received.
Preferably, each of the sending ends includes: the address control module is used for selecting one of the received address identification information and the marking signals of the quantity of the residual address information to output as the address information; the framing module is used for framing the output of the address control module, the preamble and the payload; and the modulator is connected with the framing module and used for modulating the output of the framing module and outputting a transmitting signal, and the transmitting signal comprises the preamble data frame.
Preferably, each of the sending ends further includes: and the address generator is connected with the address control module and is used for configuring a memory of the address generator under the action of an external control signal to generate the address identification information.
The technical scheme of the invention has the advantages that: the invention adds address information in the preamble data frame, so that the receiving end judges whether to receive the data packet in the stage of receiving the preamble, and the receiving end which does not accord with the address information does not receive the data packet and enters the sleep mode, thereby solving the problem of furthest reducing the system power consumption.
Drawings
FIG. 1 is a block diagram of a communication system according to a preferred embodiment of the present invention;
fig. 2 is a block diagram of a receiving module according to a preferred embodiment of the present invention;
FIG. 3 is a block diagram showing a matching control module according to a preferred embodiment of the present invention;
fig. 4 is a schematic diagram of a preamble data frame according to a preferred embodiment of the present invention;
FIG. 5 is a block diagram showing the configuration of a transmitting end in a communication system according to the preferred embodiment of the present invention;
fig. 6 is a flow chart of a receiving end in the communication system according to the preferred embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, in a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, there is now provided a communication system including at least one transmitting terminal 1 and at least one receiving terminal (2, 2A,) in communication with the at least one transmitting terminal 1, each of the receiving terminals respectively including: a receiving module 21, configured to receive, in an awake mode, a preamble data frame including address information transmitted from a transmitting end; the matching control module 22 is connected with the receiving module 21 and is used for controlling the receiving module 21 to receive the data packet transmitted by the transmitting end after the preamble data frame is received when the address information accords with a preset receiving rule; and controlling the receiving module 21 to enter the sleep mode when the address information does not conform to the preset receiving rule.
Specifically, considering that in the prior art, the address information is usually located in a data segment where a payload (payload) is located, the receiving end node must receive the preamble before receiving the address information in the payload, and then determine whether to receive the data packet, thereby causing a problem of wasting a large amount of power consumption. In this embodiment, by adding address information to the data segment where the preamble is located, the receiving end is enabled to receive the address information earlier and determine whether to receive the data packet. Compared with the prior art, the receiving end corresponding to the node which does not accord with the address information in the embodiment of the invention can enter the sleep mode earlier, thereby reducing the system power consumption.
As a preferred embodiment, wherein, as shown in fig. 2, the receiving module 21 includes: the demodulation unit is configured to demodulate the address information after receiving the address information, and output the demodulated address information to the matching control module 22.
Specifically, in the present embodiment, after receiving the address information, the receiving module 21 demodulates the received data by the demodulating unit to form data that can be sent to the matching control module 22.
As a preferred embodiment, each receiving end is preset with a receiving end address; the preset receiving rule is that the received address information is matched with the address of the receiving end.
Specifically, each receiving end corresponds to a receiving end address, the receiving ends corresponding to different receiving ends are different, and the receiving end can only receive the following data packet when the received address information accords with the self address of the receiving end. Therefore, in this embodiment, after the receiving end receives the address information in the preamble stage, the receiving end compares the demodulated address information with the address of the receiving end itself. If the received address information is matched with the address of the receiving end, receiving the following data packet; if the received address information is not matched with the address of the receiving end, the receiving end is controlled to enter a sleep mode in advance, and power consumption is reduced.
As a preferred embodiment, wherein, as shown in fig. 3, the matching control module 22 includes: the first control unit 221 is configured to control the receiving module 21 to enter the wake-up mode after sleeping for a preset sleep time before the preamble data frame is received, so as to receive the data packet when the address information conforms to a preset receiving rule and the receiving end is in a preset packet receiving mode.
Specifically, considering that the receiving end corresponding to the node with the address information is required to receive the preamble completely longer to enter the stage of receiving the payload, the phenomenon of wasting power consumption also exists. In this embodiment, for the receiving end corresponding to the node with the address information, when it is determined that the address information is consistent, the receiving end is temporarily turned off, and enters a sleep mode, during which the receiving end does not receive data any more, and then wakes up again when the preamble data frame is completely transmitted, and then receives the data packet, thereby reducing the power consumption of the receiving end to the maximum extent.
As a preferred embodiment, the preset sleep time is the remaining reception time of the preamble data frame.
Specifically, the preset sleep time is the remaining receiving time from the position of the address information successfully matched in the data frame to the last frame of the preamble data frame.
Further, the preset packet receiving mode may be a counter mode, in which, when the transmitting end transmits the data packet, the transmitting end marks the amount of the remaining address information in the preamble in the address information of the last packet of the basic unit in the preamble data frame, so that when the receiving end receives the preamble data frame and judges that the address information is consistent, the receiving end can pre-estimate the remaining receiving time of the preamble data frame, thereby adjusting the sleep time of the receiving end and reducing the power consumption while ensuring that the receiving end can completely receive the data packet.
As a preferred embodiment, as shown in fig. 4, the preamble data frame includes at least one basic unit, each basic unit includes a plurality of packets, and each packet includes a preamble and at least one address information; the remaining number of packets of the data frame is the number indicated by the address information of the last packet of the received basic unit.
Specifically, the preamble data frame includes a variable number of repeated basic units, and in general, before the receiving end receives the field of the preamble data frame, the transmitting end repeatedly transmits data of the field where the entire basic unit is located.
By way of example and not limitation, the preamble data frame has a structure as shown in fig. 4, and the preamble data frame includes a first basic unit field1, second basic units field2, … …, and an nth basic unit field N, N being an integer greater than 0; each basic unit comprises four groups: first Group1, group2, group3, group4; each packet includes a variable number of preamble preambles and two address information ADDR1 and ADDR2.
Further, in a preferred embodiment, the first packet in a basic unit has a minimum of 8 Pg, and other packets may have 0 Pg. Pg preamble number in one Group is the number of preambles in a packet, i.e. the number of preambles before ADDR in the Group shown in fig. 4. The number of address information is set to 2 in all the packets.
Further, the number of packets in the preamble data frame is specified in advance at the transmitting end and the receiving end, and the number of packets at the transmitting end and the receiving end is the same.
Further, the preamble may be implemented by using an existing chirp signal, which is not described herein.
As a preferred embodiment, the matching control module 22 further includes: the calculating unit 223 is configured to calculate, when the receiving end is in the preset packet receiving mode, a remaining receiving time of the preamble data frame according to a position of the currently demodulated address information in the preamble data frame and a remaining packet number of the preamble data frame, and take the remaining receiving time as a preset sleep time.
Specifically, in this embodiment, for a receiving end that accords with a receiving rule, that is, when the received address information matches with the own address, the position of the address information successfully matched after demodulation in the preamble data frame is determined, the number of remaining packets is determined according to the address information of the last packet of a basic unit, and the number of remaining packets is recorded, and meanwhile, the remaining receiving time of the preamble data frame can be obtained by calculating the number of remaining packets, so as to determine how long the field where the data packet is located can be reached, before the field where the data packet is located is reached, the receiving end first sleeps, and wakes up again to continue to work after reaching the calculated time.
Further, considering that a certain time is required for the wake-up of the receiving end, in this embodiment, a set time may be preset, where the set time is at least slightly longer than the duration from receiving the wake-up command to completely waking up the receiving end. The remaining receiving time obtained through calculation is subtracted by the set time to be used as the preset dormancy time. The set time may be determined according to an actual application scenario, which is not limited in the embodiment of the present invention.
As a preferred embodiment, the matching control module 22 further includes: the second control unit 222 is configured to control the receiving end to enter the sleep mode after receiving and demodulating the data packet when the receiving end is not in the preset packet receiving mode.
Specifically, in this embodiment, when the receiving end is not in the counter mode, for example, in the address mode, the receiving end enters the sleep mode after receiving and demodulating the data packet, so as to avoid the increase of power consumption caused by the receiving end being in the wake-up state all the time.
As a preferred embodiment, as shown in fig. 5, each transmitting end 1 includes: an address control module 16, configured to select one of the received address identification information and the flag signals of the remaining address information as address information; a framing module 17, configured to frame the output of the address control module 16, the preamble, and the payload; the modulator 111 is connected to the framing module 17 and is configured to modulate the output of the framing module 17 and output a transmission signal, where the transmission signal includes a preamble data frame.
Specifically, in this embodiment, the transmitting end sends the address information, the preamble and the payload into the framing module 17, and after framing, the transmitting end outputs a transmission signal through the modulator 111, where the transmission signal includes the preamble data frame including the address information, and the transmission signal further includes the payload located after the preamble data frame. According to the embodiment of the invention, the address information is added into the data segment where the preamble is located, and different receiving ends are identified through the address information, so that the receiving ends can receive the address information earlier and determine whether to receive the data packet, and the aim of reducing the star networking power consumption is fulfilled; meanwhile, the number of address information can be increased on the basis of meeting the system power consumption so as to distinguish more star nodes, and the feasibility of accessing the number of nodes of the networking is increased.
As a preferred embodiment, each transmitting end 1 further includes: the address generator 12 is connected to the address control module 16, and is configured to configure the memory 13 of the address generator 12 under the action of an external control signal to generate address identification information.
Specifically, in this embodiment, the external control signal may be implemented by the external MCU controller 11, and the external MCU controller 11 configures the memory 13 corresponding to the address generator 12 to generate the address identification signal, where the address identification signal carries the address identification information.
Further, each transmitting end further includes: the counter 14 uses the output value of the counter 14 as a flag signal for the number of pieces of the remaining address information.
In a preferred embodiment, the transmitting end may further include: the first encoder 15 is connected to the counter 14 and the address control module 16, and is configured to encode an output value of the counter 14 and output the encoded output value to the address control module 16. In a preferred embodiment, 1 value may represent 1 address identification signal after the value output from the variable counter is encoded by the first encoder 15; alternatively, 1 number may represent a plurality of address identification signals.
Further, the address control module 16 selects one of the address identification information and the flag signal of the number of encoded remaining address information to output as the address information according to a predetermined selection policy.
Further, in a preferred embodiment, the above-mentioned predetermined selection policy may be: selecting a marking signal of the number of the coded residual address information in the last packet of one basic unit as an output; address identification information is selected from other packets as output. Further, the output value of the counter is used to indicate the number of remaining address signals, so as to indicate how long the remaining portion of the preamble data frame currently being received needs to be synchronously received, so that the receiving end can keep the sleep state until the data receiving stage, and when the data receiving stage is to be reached, the receiving end wakes up again to receive data.
In the above preferred embodiment, the communication system provided in the embodiment of the present invention includes a transmitting end and a receiving end, where the transmitting end adds address information into a preamble data frame based on a chirp signal; the receiving end judges whether to receive the data packet in advance in the preamble stage by demodulating the received preamble data frame, and the receiving end which does not receive the data packet forcedly enters a sleep mode, so that the system power consumption is reduced; and waking up and receiving the packet after the preamble data frames are synchronized after the receiving end for receiving the data packet is dormant for a period of time.
In which, as shown in fig. 5, in the transmitting end, the external MCU controller 11 transfers address identification information to the address generator 12 and stores in the memory 13 corresponding to the address generator 12. The output value of the counter 14 is encoded and then enters the address control module 16 together with the address identification information, and the address identification information or the counter output value is selected as the address information by a mode of two alternatives. The framing module 17 composes the preamble outputted by the preamble generating module 18, the address information outputted by the address control module 16, and the payload encoded by the second encoder 110 after outputted by the FIFO19 into a data frame structure that can be transmitted, and then modulates the chirp signal by the modulator 111, modulates the address information into the chirp signal, and generates a transmission signal to be transmitted to the receiving end.
As shown in fig. 4, the transmitting end performs framing of address information, and transmits a variable number of preambles first, and then transmits 2 address identification signals with address information, so as to form a packet; and then the preamble is sent again, and similarly to the previous, after a certain number of address identification signals with address information of the next packet are sent, the cycle is performed, and finally all the 2 address identification signals with address information of the 4 packets are sent, and the sent data form a field of a basic unit. The data of an entire base unit is repeatedly transmitted before reaching the stage of receiving the data. In the above basic unit, the 4 th packet 2 pieces of dedicated information with address information may be replaced with the output value of the counter 14 inside the transmitting end.
As shown in fig. 6, the process flow of the judgment of the receiving end is as follows: a1, receiving a preamble data frame; a2, demodulating the address information; a3, judging whether the address is matched with the self address or not: if yes, entering A4, otherwise entering A8; a4, judging whether the counter is in a counter mode: if yes, entering A5, otherwise entering A7; a5, starting counting and entering a sleep mode; a6, entering an awake mode after presetting the sleep time; a7, receiving the data packet; a8, entering a sleep mode; a9, waiting for the next wake-up.
Specifically, in the receiving end, after the receiving end wakes up for the first time, the receiving end receives the address identification signal and demodulates the address information, at this time, the receiving end compares the demodulated address information with the information stored by itself, if the data packet is not sent to the node where the receiving end is located, the receiving end enters a dormant state, the receiving end ends the packet, and waits for the next wakeup; otherwise, if the information is matched, the receiving end can continue to receive the packet. Since a packet-receiving process can be divided into two different modes: the receiving end can judge whether the counter mode is adopted or not again after judging that the information is matched, if the counter mode is adopted, the receiving end can record the current demodulated memory value, calculate how long the data receiving stage is reached, start counting, enter a dormant state, wait for a proper time and wake up again, and then start receiving and demodulating the data; if the receiving end adopts the address mode, the receiving end does not enter the sleep mode, but is in the wake-up state to demodulate the received data until the whole packet of data is demodulated.
The beneficial effects of adopting above-mentioned technical scheme lie in: the invention adds address information in the preamble data frame, so as to control whether the receiving end enters dormancy according to the address information in the stage of receiving the preamble, namely, when the node of which the address of the receiving end does not accord with the address information enters dormancy, the power consumption of the node in the star network is reduced to the maximum extent.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations herein, which should be included in the scope of the present invention.
Claims (9)
1. A communication system comprising at least one transmitting end and at least one receiving end in communication with said at least one transmitting end, each of said receiving ends comprising: a receiving module, configured to receive, in an awake mode, a preamble data frame including address information transmitted from the transmitting end, where the preamble data frame includes at least one basic unit, each of the basic units includes a plurality of packets, and each packet includes a preamble and at least one address information; the matching control module is connected with the receiving module and is used for controlling the receiving module to receive the data packet transmitted by the transmitting end after the preamble data frame is received when the address information accords with a preset receiving rule; when the address information does not accord with the preset receiving rule, controlling the receiving module to enter a sleep mode;
the address information is one of the address identification information and the marking signals of the number of the coded residual address information according to a preset selection strategy; the address identification information is generated by configuring a memory corresponding to the address generator through an external MCU controller; the predetermined selection strategy is: selecting a flag signal of the encoded remaining address information amount from a last packet of a basic unit of the preamble data frame as an output; selecting the address identification information from other groups as output;
the matching control module comprises: and the first control unit is used for controlling the receiving module to enter the wake-up mode after dormancy for a preset dormancy time before the preamble data frame is received completely so as to receive the data packet when the address information accords with the preset receiving rule and the receiving end is in a preset packet receiving mode.
2. The communication system of claim 1, wherein the receiving module comprises: and the demodulation unit is used for demodulating the address information after receiving the address information and outputting the demodulated address information to the matching control module.
3. The communication system of claim 1, wherein each of said receiving terminals is preset with a receiving terminal address; the preset receiving rule is that the received address information is matched with the address of the receiving end.
4. The communication system of claim 1, wherein the matching control module further comprises: and the second control unit is used for controlling the receiving end to enter the sleep mode after receiving and demodulating the data packet when the receiving end is not in the preset packet receiving mode.
5. The communication system of claim 1, wherein the predetermined sleep time is a remaining reception time of the preamble data frame.
6. The communication system of claim 1, wherein the matching control module further comprises: and the calculating unit is used for calculating the residual receiving time of the preamble data frame according to the position of the address information currently demodulated in the preamble data frame and the residual packet number of the preamble data frame when the receiving end is in the preset packet receiving mode.
7. The communication system according to claim 6, wherein the remaining number of packets of the data frame is a number indicated by address information of a last packet of the base unit that has been received.
8. The communication system according to claim 1, wherein each of the transmitting ends includes: the address control module is used for selecting one of the received address identification information and the marking signals of the quantity of the residual address information to output as the address information; the framing module is used for framing the output of the address control module, the preamble and the payload; and the modulator is connected with the framing module and used for modulating the output of the framing module and outputting a transmitting signal, and the transmitting signal comprises the preamble data frame.
9. The communication system of claim 8, wherein each of the transmitting ends further comprises: and the address generator is connected with the address control module and is used for configuring a memory of the address generator under the action of an external control signal to generate the address identification information.
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