CN111542077B - Communication node selection method and device - Google Patents

Communication node selection method and device Download PDF

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Publication number
CN111542077B
CN111542077B CN202010363876.8A CN202010363876A CN111542077B CN 111542077 B CN111542077 B CN 111542077B CN 202010363876 A CN202010363876 A CN 202010363876A CN 111542077 B CN111542077 B CN 111542077B
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communication
communication device
interval
data
receiving
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CN111542077A (en
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刘宏波
张亚娥
孙晓春
牛功喜
谢磊
杨栋
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Harbin Hytera Technology Corp ltd
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Harbin Hytera Technology Corp ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • 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)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a communication node selection method and a device, which receive communication data sent by a first communication device, calculate first signal quality according to the communication data sent by the first communication device, determine a sending interval and a receiving interval of a second communication device in a first type judging window according to the first signal quality and identification information of the second communication device, select whether the second communication device is used as a unique first communication node or not based on the data sending condition of the second communication device in the sending interval and the data receiving condition of the second communication device in the receiving interval, and indicate the data sending condition of other second communication devices in the corresponding time of the receiving interval according to the data receiving condition of the receiving interval, so that the data sending conditions of the second communication device and other second communication devices can be comprehensively considered, the unique first communication node can be selected, the selection process is simplified, resources are saved, and the same-frequency simulcasting problem caused by a plurality of first communication nodes is avoided.

Description

Communication node selection method and device
Technical Field
The invention belongs to the technical field of wireless ad hoc networks, and particularly relates to a communication node selection method and device.
Background
In the field of wireless communication, a wireless ad hoc network is formed by wireless continuous communication devices in a linear or mesh networking manner, each communication device in the wireless ad hoc network is a communication node, and data streams from the first communication node to the last communication node are wirelessly transmitted in a point-to-point or point-to-multiple manner so as to ensure blind spot area coverage and link backup.
But for the first communication node in the wireless ad hoc network, the link service efficiency of the wireless ad hoc network is reduced if the first communication node cannot select preferentially. Currently, the first communication node is selected as follows:
the selection threshold is preset, if a plurality of communication devices can receive communication data (such as voice data sent by a terminal) sent by communication devices outside the wireless ad hoc network, the plurality of communication devices respectively judge whether the signal quality of each communication device is greater than the selection threshold, and if the signal quality of each communication device is greater than the selection threshold, the communication device is used as a first communication node.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for selecting a communication node, wherein a unique first communication node is selected based on a data transmission condition of a second communication apparatus and a data reception condition of the second communication apparatus.
In one aspect, the present invention provides a method for selecting a communication node, where the method is applied to a second communications device, and the method includes:
receiving communication data sent by a first communication device, and calculating first signal quality according to the communication data sent by the first communication device;
determining a sending interval and a receiving interval of the second communication device in a first type judging and selecting window according to the first signal quality and the identification information of the second communication device;
and selecting whether the second communication device is the only first communication node or not based on the data transmission condition of the second communication device in the transmission interval and the data reception condition of the second communication device in the reception interval.
Optionally, the selecting, based on the data transmission condition of the second communication device in the transmission interval and the data reception condition of the second communication device in the reception interval, whether the second communication device is a unique first communication node includes:
if receiving decision data sent by other second communication devices before entering the sending interval, forbidding the second communication device as a first communication node;
if the judgment data sent by other second communication devices is not received before entering the sending interval, but the judgment data sent by other second communication devices is received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node;
and if the judgment data sent by other second communication devices are not received before the second communication device enters the sending interval and the judgment data sent by other second communication devices are not received after the second communication device enters the receiving interval, allowing the second communication device to be used as the only first communication node.
Optionally, a start time of the transmission interval is related to a start time of an interval in which the first signal quality is located in the first type decision window, and an end time of the transmission interval is related to the identification information of the second communication device.
Optionally, the method further includes: controlling the second communication device to switch from a transmission mode to a reception mode before reaching an end time of the transmission interval;
and/or
And controlling the second communication device to switch from a receiving mode to a transmitting mode before reaching the end time of the receiving interval.
Optionally, the method further includes:
receiving communication data sent by a forwarding communication node, and calculating second signal quality according to the communication data sent by the forwarding communication node;
determining a reception interval of the second communication device in a second type decision window based on the second signal quality;
and selecting whether the second communication device is used as a forwarding communication node or not based on the data receiving condition of the second communication device in the receiving interval of the second type judging and selecting window.
Optionally, the selecting, based on a data reception condition of the second communication device in the reception interval of the second type decision window, whether the second communication device is a forwarding communication node or not includes:
if the judgment data sent by other second communication devices is received in the receiving interval of the second type judgment and selection window, the second communication device is forbidden to be used as a forwarding communication node;
and if the judgment data sent by other second communication devices is not received in the receiving interval of the second type judgment window, allowing the second communication device to be used as a forwarding communication node.
In another aspect, the present invention provides a communication node selection apparatus applied to a second communication apparatus, including:
a receiving unit configured to receive communication data transmitted by a first communication apparatus;
a calculation unit configured to calculate a first signal quality from communication data transmitted by the first communication apparatus;
a determining unit, configured to determine, according to the first signal quality and the identification information of the second communication apparatus, a transmission interval and a reception interval of the second communication apparatus in a first type decision window;
a selecting unit, configured to select whether the second communication device is a unique first communication node based on a data transmission situation of the second communication device in the transmission interval and a data reception situation of the second communication device in the reception interval.
Optionally, the selecting unit is configured to prohibit the second communication apparatus from being a first communication node if the decision data sent by the other second communication apparatus is received before entering the sending interval;
if the judgment data sent by other second communication devices is not received before entering the sending interval, but the judgment data sent by other second communication devices is received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node;
and if the judgment data sent by other second communication devices is not received before the second communication device enters the sending interval and the judgment data sent by other second communication devices is not received after the second communication device enters the receiving interval, allowing the second communication device to be used as the only first communication node.
Optionally, a start time of the transmission interval is related to a start time of an interval where the first signal quality is located in the first type decision window, and an end time of the transmission interval is related to identification information of the second communication device.
Optionally, the apparatus further comprises: a control unit configured to control the second communication apparatus to switch from a transmission mode to a reception mode before reaching an end time of the transmission section;
and/or
And controlling the second communication device to switch from a receiving mode to a transmitting mode before reaching the end time of the receiving interval.
Optionally, the receiving unit is further configured to receive communication data sent by a forwarding communication node;
the computing unit is further configured to compute a second signal quality according to the communication data sent by the forwarding communication node;
the determining unit is further configured to determine a receiving interval of the second communication apparatus in a second type decision window based on the second signal quality;
the selecting unit is further configured to select, in the receiving interval of the second type decision window, whether the second communication device is a forwarding communication node or not based on the data receiving situation of the second communication device.
Optionally, the selecting unit is configured to prohibit the second communication device from being a forwarding communication node if the decision data sent by the other second communication device is received in the receiving interval of the second type decision window;
and if the judgment data sent by other second communication devices is not received in the receiving interval of the second type judgment window, allowing the second communication device to be used as a forwarding communication node.
In yet another aspect, the present invention provides a communications apparatus comprising a processor and a storage medium having program code stored thereon;
the processor executes the program code such that the processor implements any of the above-described communication node selection methods.
In yet another aspect, the present invention provides a storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing any of the above-described communication node selection methods.
According to the technical scheme, the communication data transmitted by the first communication device is received, the first signal quality is calculated according to the communication data transmitted by the first communication device, the transmission section and the receiving section of the second communication device in the first type judging and selecting window are determined according to the first signal quality and the identification information of the second communication device, whether the second communication device is used as the only first communication node or not is selected according to the data transmission condition of the second communication device in the transmission section and the data receiving condition of the second communication device in the receiving section, the data receiving condition of the second communication device in the receiving section can indicate the data transmission condition of other second communication devices in the corresponding time of the receiving section, the only first communication node can be selected by comprehensively considering the data transmission condition of the second communication device and the data transmission condition of other second communication devices, and the problem of simulcasting caused by the data transmitted by the plurality of second communication devices when the plurality of second communication devices are simultaneously used as the first communication nodes is avoided.
And when the only first communication node is selected, the second communication device can independently judge by combining the data transmission condition of the second communication device and the data transmission condition of other second communication devices, other equipment does not need to be configured for the second communication device, the selection process is simplified, the second communication device can complete the selection of the first communication node of the communication network where the second communication device is located in a first type judging and selecting window, and excessive service frequency points and link frequency points do not need to be distributed for the second communication device, so that the resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a communication node selection method according to an embodiment of the present invention
Fig. 2 is a schematic diagram of a wireless ad hoc network according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a first type decision window according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating time consumed for switching between a transmission mode and a reception mode according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a selection of a first communication node according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another alternative first communication node provided by an embodiment of the present invention;
fig. 7 is a flow chart of another method for selecting a communication node according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a second type of arbitration window according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a communication node selection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, which shows a communication node selection method provided by an embodiment of the present invention, when applied to a second communication device, where the second communication device and other second communication devices are located in a communication network, such as a wireless ad hoc network shown in fig. 2, the wireless ad hoc network shown in fig. 2 includes, but is not limited to, five second communication devices, the second communication devices in the wireless ad hoc network can communicate by, but is not limited to, a wireless communication method, multiple second communication devices (such as the second communication devices marked with circles 1 to 3 in fig. 2) in the five second communication devices can communicate with a first communication device by using, but is not limited to, a wireless communication method, the multiple second communication devices can receive communication data sent by the first communication device, for example, the multiple second communication devices can receive traffic data sent by a terminal of the first communication device, such as voice data and/or video data, and the multiple second communication devices need to select one second communication device as the first communication node after receiving the communication data, and the first communication device forwards the traffic data, where the first communication device forwards the first communication node, and the multiple communication node selection method provided by this embodiment of the present invention includes the following steps:
101: the communication data sent by the first communication device is received, and the first signal quality is calculated according to the communication data sent by the first communication device. For the first signal quality, the first signal quality may be represented by, but not limited to, a first field strength, which may be calculated according to the communication data sent by the first communication device, and for this embodiment, the calculation process is not described in detail.
The communication data sent by the first communication device may include preamble data, where the preamble data is used by the first communication device to indicate that real data is to be sent, for example, when the communication data sent by the first communication device is voice data, the preamble data is sent before the voice data is sent to indicate that the voice data is to be sent by the first communication device, and the first signal quality is calculated according to the preamble data.
102: and determining the transmitting interval and the receiving interval of the second communication device in the first type judging and selecting window according to the first signal quality and the identification information of the second communication device.
It can be understood that: the transmission interval and the reception interval have the following functions: the second communication device transmits the decision data in the transmission section of the first type decision window, and receives the decision data transmitted by the other second communication device in the reception section of the first type decision window. In the present embodiment, the relationship between the time interval for calculating the first signal quality and the first type decision window is shown in fig. 3.
Time intervals are divided between two adjacent received communication data to serve as a first type judgment window, for example, in fig. 3, a time interval after the time interval for receiving the first communication data serves as a part of the first type judgment window, then a time interval for receiving the second communication data serves as a remaining part of the first type judgment window, and then one time interval is selected to serve as a remaining part of the first type judgment window, so that the adjacent time intervals are selected to form the first type judgment window after the time intervals for receiving the first communication data and the second communication data.
In this embodiment, the time interval for receiving the communication data may be the same as or different from the time interval of the first type reselection window, and the duration of the first type reselection window is related to the number of the second communication devices that select the first communication node in the communication network, the duty ratio of each reselection micro window in the first type reselection window, and the division of the signal quality in the first type reselection window.
With reference to fig. 3, the following description will be made by taking as an example that the number of the second communication devices selecting the first communication node is 12, the first type selection window is 60ms (millisecond), the length of a time interval for receiving communication data is 30ms, the duration of each selection micro-window is 4ms, and the signal quality is divided into three levels greater than-60 dBm, -60-90 dBm, and-90-120 dBm, where two first type selection windows need to be set to meet the requirements of 12 second communication devices.
In the schematic diagram of the first type decision window shown in fig. 3, two time intervals constituting the first type decision window are respectively located after and adjacent to the time interval of receiving LC1 (first preamble data), and located after and adjacent to the time interval of receiving LC2 (second preamble data). And reserving 1ms on each side of the first type judging and selecting window (especially reserving 1ms on each side of two time intervals forming the first type judging and selecting window) so that the second communication device can prepare for selecting the first communication node through the reservation of 1 ms.
The first three judging and selecting micro windows of the first type judging and selecting window correspond to the divided signal quality, the grades of the signal quality corresponding to the three judging and selecting micro windows are sequentially decreased, the higher the grade of the signal quality is, the better or better the corresponding signal quality is, namely the signal quality corresponding to the first judging and selecting micro window in the first three judging and selecting micro windows is better than the signal quality corresponding to the second judging and selecting micro window, the signal quality corresponding to the second judging and selecting micro window is better than the signal quality corresponding to the third judging and selecting micro window, if the field intensity is taken as the signal quality, the field intensity corresponding to the first judging and selecting micro window is higher than the field intensity corresponding to the second judging and selecting micro window, the field intensity corresponding to the second judging and selecting micro window is higher than the field intensity corresponding to the third judging and selecting micro window, so that the second communication device can determine the judging and selecting micro window corresponding to the first signal quality of the second communication device from the first three judging and selecting micro windows according to the calculated first signal quality, and the judging and selecting micro window corresponding to determine the judging micro window of the first type communication device at the starting time of the first type communication device.
And the other judging and selecting micro-windows except the first three judging and selecting micro-windows in the first type judging and selecting window respectively correspond to the identification information (such as the ID of the second communication device) of one second communication device, so that the end time of the second communication device in the transmission interval of the first type judging and selecting window is determined according to the identification information of the second communication device. For example, if the IDs of 12 second communication apparatuses in the wireless ad hoc network shown in fig. 2 are ID1 to ID12, the broken line shown in fig. 3 corresponds to the ID of one second communication apparatus, and indicates the end time of the transmission interval of the corresponding second communication apparatus.
For example, if the identification information of the second communication device is ID1 and the first field strength is-55 dBm, the second communication device selects the first to fourth judging and selecting micro-windows at the beginning of the transmission interval of the first type judging and selecting window; if the identification information of the second communication device is ID2 and the first field strength is-55 dBm, the second communication device is the first to fifth judging and selecting micro-windows at the beginning of the transmission interval of the first type judging and selecting window, so in this embodiment, the beginning of the transmission interval of the second communication device in the first type judging and selecting window is related to the beginning of the interval of the first signal quality in the first type judging and selecting window, and the ending of the transmission interval is related to the identification information of the second communication device.
After the second communication device is determined to be in the transmission interval of the first type judgment and selection window, other intervals of the first type judgment and selection window are the receiving intervals of the second communication device in the first type judgment and selection window.
As can be seen from the first type decision window shown in fig. 3, the preamble data received before the first communication node is determined can be ignored, i.e., the preamble data received before the first communication node is determined is not sent to the forwarding communication node. Preamble data received after the first communication node is determined may be transmitted to the forwarding communication node, which may result in the preamble data being lost but with a relatively reduced delay relative to transmitting preamble data received before the first communication node is determined. And if the duration of the reselection micro-window of the first type reselection window is longer and/or the number of the second communication devices for determining the first communication node is larger, the delay of sending the preamble data or the communication data may increase.
Further, in the present embodiment, the first decision micro-window of the first type decision window shown in fig. 3 may perform noise evaluation to determine the strength of the noise signal of the environment where the second communication apparatus is located when no decision data is transmitted, so that the receiving section can distinguish whether currently received decision data or noise data is received according to the strength of the noise signal evaluated in advance to exclude the influence of the noise data, and the number of the corresponding second communication apparatuses is changed from 12 to 11.
103: the second communication device is selected whether to be the only first communication node based on the data transmission situation of the second communication device in the transmission interval and the data reception situation of the second communication device in the reception interval.
In the present embodiment, the second communication device transmits the decision data in the transmission section, and the same second communication device receives the decision data transmitted by another second communication device in the reception section, so that the present embodiment can select whether or not to serve as the only first communication node for the second communication device based on the data transmission situation in the transmission section and the data reception situation in the reception section of the second communication device, and the second communication device can determine whether or not to serve as the only first communication node based on the data transmission situation and the data reception situation of the second communication device.
One possible way of whether the second communication device acts as the only first communication node is:
if the judgment data sent by other second communication devices is received before entering the sending interval, the second communication device is forbidden to be used as a first communication node; if the judgment data sent by other second communication devices is not received before entering the sending interval, but the judgment data sent by other second communication devices is received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node; and if the judgment data sent by other second communication devices are not received before entering the sending interval and the judgment data sent by other second communication devices are not received after entering the receiving interval, allowing the second communication device to be used as the only first communication node.
In this embodiment, the decision data is data that is transmitted by communication nodes between the second communication devices selectively, the type of the decision data is selected according to the type of the communication data, for example, the communication data is voice data, and the voice data is modulated and demodulated by using but not limited to a 4FSK (Frequency-shift keying) manner, so that the corresponding decision data may be +3 symbol data, the minimum duration of the +3 symbol data is a decision micro-window of the first type decision-window, and the total duration is related to the duration of the transmission interval. Under the condition that the judgment and selection micro-window is 4ms, the judgment data can be accurately received by testing the field intensity of the second communication device to be at least-110 dBm.
According to the technical scheme, the communication data transmitted by the first communication device is received, the first signal quality is calculated according to the communication data transmitted by the first communication device, the transmission interval and the receiving interval of the second communication device in the first type judging and selecting window are determined according to the first signal quality and the identification information of the second communication device, whether the second communication device is used as the only first communication node or not is selected according to the data transmission condition of the second communication device in the transmission interval and the data receiving condition of the second communication device in the receiving interval, the data receiving condition of the second communication device in the receiving interval can indicate the data transmission condition of other second communication devices in the time corresponding to the receiving interval, therefore, the data transmission condition of the second communication device and the data transmission condition of other second communication devices can be comprehensively considered, the only first communication node is selected, and the same-frequency broadcasting problem of the next communication node caused by the data transmitted by the plurality of second communication devices when the plurality of second communication devices are simultaneously used as the first communication node is avoided.
When the only first communication node is selected, the second communication device can independently judge by combining the data sending condition of the second communication device and the data sending condition of the other second communication device, other equipment does not need to be configured for the second communication device, the selection process is simplified, the second communication device can complete the selection of the first communication node of the communication network where the second communication device is located in a first type judging and selecting window, and excessive service frequency points and link frequency points do not need to be distributed for the second communication device, so that resources are saved.
When the signal quality division is performed on the first type judgment window, the better the signal quality corresponding to the judgment micro-window arranged in front, so that the second communication device with the better signal quality can transmit the judgment data earlier, the better the signal quality of the second communication device, the lower the probability of receiving the judgment data transmitted by other second communication devices before entering a transmission interval, therefore, when the first communication node is selected based on the data transmission condition and the data reception condition, the second communication device with the better signal quality can be selected from all the second communication devices which can directly receive the communication data transmitted by the first communication device from the terminal, so that the second communication device with the better signal quality can be selected as the first communication node under the condition that the only first communication node can be selected, the second communication device with the better signal quality can be selected as the first communication node, the signal quality of the selected second communication device is relatively optimal, and the quality of the communication data forwarded by the second communication device is relatively optimal (for example, the reliability of the forwarded communication data and the accuracy of the forwarded data can be improved in the communication process.
If a second communication device with better signal quality needs to be selected from all second communication devices which can receive communication data sent by the first communication device, the first type selection window can be divided into signal qualities with finer granularity when the first type selection window is corresponding to the signal qualities, so that the difference between the signal qualities corresponding to the same selection micro-window is reduced, and the sending interval can be better divided according to the signal qualities.
The first type selection window includes a receiving interval and a transmitting interval, where the second communication device is in a receiving mode in the receiving interval, the second communication device is in a transmitting mode in the transmitting interval, and a certain time is consumed for switching from the receiving mode to the transmitting mode and switching from the transmitting mode to the receiving mode, so that the method for selecting a communication node according to this embodiment may further include: the second communication device is controlled to switch from the transmission mode to the reception mode before the end time of the transmission interval is reached, and/or the second communication device is controlled to switch from the reception mode to the transmission mode before the end time of the reception interval is reached.
In the present embodiment, one way of switching from the transmission mode to the reception mode and switching from the reception mode to the transmission mode is shown in fig. 4, when switching from the reception mode to the transmission mode, the second communication device needs to perform data processing and turn on the power amplifier, so that the time consumed for switching from the reception mode to the transmission mode is related to the data processing time and the turn-on time of the power amplifier, in the present embodiment, the time consumed for switching from the reception mode to the transmission mode may be 1.45ms, and 0.34ms may pass during the time period of the 1.45ms to perform filtering to prepare for receiving data; however, switching from the transmission mode to the reception mode also requires data processing and turning off the power amplifier, so that the time consumed for switching from the transmission mode to the reception mode is related to the data processing time and the turning off time of the power amplifier, and in this embodiment, the time consumed for switching from the transmission mode to the reception mode may be 0.64ms.
The selection of a single first communication node from the two second communication devices is explained below with the IDs of the two second communication devices ID1 and ID2, respectively, and the first signal quality is the first field strength, wherein the second communication device of ID1 is referred to as second communication device 1 for short and the second communication device of ID2 is referred to as second communication device 2 for short.
As shown in fig. 5, the first field strength calculated by the second communication device 1 and the first field strength calculated by the second communication device 2 after receiving the preamble data are both greater than-60 dBm, and the start time of the transmission interval of the second communication device 1 is the same as that of the transmission interval of the second communication device 2, so that the second communication device 1 and the second communication device 2 can transmit the decision data at the same time/in the proximity time. The second communication apparatus 1 realizes switching from the transmission mode to the reception mode 0.64ms before the end of transmission of the decision data, and ensures that the transmission of the decision data can be stopped at the end time. After entering the receiving interval, the second communication device 1 performs filtering that takes 0.34ms to prepare for data reception, and after entering the receiving interval, receives the decision data sent by the second communication device 2, so that the second communication device 2 can be used as the first communication node.
If the first field strength of the second communication device 1 is greater than-60 dBm, the first signal quality of the second communication device 2 is-80 dBm, as shown in fig. 6, the second communication device 1 and the second communication device 2 are in the transmission mode, but the first field strength of the second communication device 2 is-80 dBm, the second communication device 2 needs to enter the reception interval first, at this time, the second communication device 2 takes 1.45ms to switch to the reception mode, and takes 0.34 of filtering to perform data reception preparation, and receives the decision data of the second communication device 1, the second communication device 2 does not make the first communication node, and the second communication device 2 does not send the decision data. Fig. 5 and 6 show transmission intervals of the first communication apparatus 1 and the second communication apparatus 2 in the first type decision window, and except for the transmission interval and the reserved interval, other intervals in the first type decision window are reception intervals, and fig. 5 and 6 are not labeled any more.
In the above description, how to select the first communication node, a forwarding communication node may also be selected in this embodiment, and a corresponding flowchart is shown in fig. 7, which illustrates another method for selecting a communication node according to an embodiment of the present invention, and may include the following steps:
201: the communication data sent by the first communication device is received, and the first signal quality is calculated according to the communication data sent by the first communication device.
202: and determining the transmitting interval and the receiving interval of the second communication device in the first type judging and selecting window according to the first signal quality and the identification information of the second communication device.
203: the second communication device is selected whether to be the only first communication node based on the data transmission situation of the second communication device in the transmission interval and the data reception situation of the second communication device in the reception interval.
In this embodiment, please refer to the above embodiment for the description of the steps 201 to 203, which will not be described again. If the second communication device receives the communication data sent by the first communication device, the second communication device may further determine whether the second communication device can be used as a forwarding communication node by the above steps 201 to 203, where the forwarding communication node is a communication node for forwarding the communication data when the first communication device and the server interact with each other, and the communication nodes can forward the communication data between the first communication devices and between the first communication device and the server, and the selected first communication node is the first communication node for forwarding the communication data. The corresponding procedure for selecting a forwarding communication node is as follows from step 204 to step 206.
204: and receiving the communication data sent by the forwarding communication node, and calculating the second signal quality according to the communication data sent by the forwarding communication node. The manner of calculating the second signal quality may be obtained according to the signal strength of the communication data sent by the forwarding communication node, and details of this embodiment are not described again. For the second signal quality, the second signal quality may be represented by, but is not limited to, a second field strength, which may be calculated according to the communication data sent by the forwarding communication node, and for this embodiment, the calculation process is not described in detail.
The forwarding communication node may be the first communication node selected in the above manner, or may be another forwarding communication node in the communication network, which is capable of receiving the communication data sent by the forwarding communication node as long as the second communication device is located in the signal coverage area of the forwarding communication node.
205: and determining a receiving interval of the second communication device in the second type judging and selecting window based on the second signal quality.
It can be understood that: the receiving interval in the second type judging and selecting window has the following functions: receiving the judgment data sent by other second communication devices, wherein the second communication devices correspond to a sending interval in the second type judgment and selection window, and the sending interval has the functions of: and transmitting the decision data to the other second communication device to enable the other second communication device to receive the decision data. In this embodiment, the second signal quality is calculated in a time interval before the second type decision window, and then the second type decision window may directly determine a transmission interval according to the second signal quality, and then use a remaining interval of the second type decision window as a reception interval. The reason why the transmission interval is determined first is that in the process of designing the second type decision window, the time interval of the second type decision window is corresponding to the signal quality to indicate the time length for the second communication device to transmit the decision data under different signal qualities, so in this embodiment, the transmission interval may be determined in the second type decision window according to the second signal quality, and the remaining interval except the transmission interval in the second type decision window is taken as the reception interval.
In this embodiment, a schematic diagram of the second type decision window is shown in fig. 8, which illustrates the correspondence between different signal qualities and time intervals, and illustrates the correspondence between the second type decision window and the time interval for receiving communication data. It can be seen from fig. 8 that the second type decision window is located after and adjacent to the first time interval for receiving the communication data, so that it can be determined whether to act as a forwarding communication node immediately after receiving the communication data. However, since the relay communication data is delayed after the first time interval for receiving the communication data is used to determine the forwarding communication node, the first communication data is delayed by two time intervals for forwarding as shown in fig. 8, if the number of the second communication devices for determining the forwarding communication node increases, the time interval of the second type of decision window that may be needed increases, and the first type of decision window as shown in fig. 3 may occupy more time intervals, which further increases the delay of the communication data.
In fig. 8, different signal qualities of the second type judging and selecting window correspond to different time intervals, time intervals of the second type judging and selecting window for receiving communication data and forwarding the communication data are all 30ms, the duration of each judging and selecting micro-window in the second type judging and selecting window is 4ms, 1ms is reserved on two sides, four field intensity intensities are divided in fig. 8 to represent the signal quality, and the field intensity is respectively-50 dBm, -70dBm, -90dBm and-100 dBm, so that a sending interval larger than-50 dBm corresponds to an arrow where-50 dBm is located, a sending interval smaller than or equal to-50 dBm and larger than-70 dBm corresponds to an arrow where-70 dBm is located, a sending interval smaller than or equal to-70 dBm and larger than-90 dBm corresponds to an arrow where-100 dBm is located, and even a sending interval smaller than or equal to-100 dBm corresponds to an arrow where-90 dBm is located, and so that the sending interval smaller than or equal to-100 dBm corresponds to the arrow where the second type judging and selecting window is located, and the time intervals corresponding to the second signal quality of the second type judging and the second signal can be found after the second signal.
It can be known from fig. 8 that the larger the field strength as the second signal quality is, the earlier the start time of the corresponding transmission interval is, so in this embodiment, the better the second signal quality is, the earlier the start time of the corresponding transmission interval is, the better the second signal quality is, the second communication device that is superior to the other second communication devices with the signal quality can transmit the decision data, and if the other second communication devices receive the decision data before transmitting the decision data, the transmission of the decision data is prohibited, so that the smaller the probability that the second communication device can receive the decision data transmitted by the other second communication devices as the second signal quality is, and based on this, the forwarding communication node can be selected based on the data reception situation. Of course, the present embodiment may also select the forwarding communication node based on the data transmission situation.
The points to be explained here are: the division of the time interval of the second type decision window and the corresponding relationship with the signal quality are only exemplary illustrations, and may also be adjusted according to actual situations, which is not further described in this embodiment. The decision data transmitted by the second communication device in the transmission interval of the second type decision window may refer to the above description of the decision data transmitted in the first type decision window, which is not described in this embodiment. Similarly, the switching between the transmission mode and the reception mode may also be performed in the second type decision window, and please refer to the above embodiment for detailed description.
206: and in the receiving interval of the second type judging and selecting window, whether the second communication device is used as a forwarding communication node is selected based on the data receiving condition of the second communication device.
One way is that: if the judgment data sent by other second communication devices are received in the receiving interval of the second type judgment window, the second communication device is forbidden to be used as a forwarding communication node; and if the judgment data sent by other second communication devices is not received in the receiving interval of the second type judgment window, allowing the second communication devices to serve as forwarding communication nodes.
The other mode is as follows: if the judgment data can be sent to other second communication devices in the sending interval of the second type judgment window, allowing the second communication devices to serve as forwarding communication nodes; and if the second communication device cannot send the judgment data in the sending interval of the second type judgment window like other second communication devices, forbidding the second communication device as a forwarding communication node.
According to the technical scheme, the second communication device can select the forwarding communication node according to the data receiving condition of the second communication device, the second communication device can independently judge according to the data receiving condition of the second communication device in the selection process, other equipment does not need to be configured for the second communication device, the selection process is simplified, the second communication device can complete the selection of the first communication node of the communication network where the second communication device is located in a first type judging and selecting window, excessive service frequency points and link frequency points do not need to be distributed for the second communication device, and therefore resources are saved. And the larger the second signal quality is, the earlier the decision data is sent, and when the forwarding communication node is selected in combination with the data receiving condition, one or more second communication devices with relatively high second signal quality can be selected as the forwarding communication node, so that the second communication devices with poor second signal quality are filtered.
However, the point to be explained here is: for the forwarding communication node, if the part of the second signal quality calculated by the plurality of second communication devices is located in the same signal quality division area, and if the part of the second field strength calculated by the plurality of second communication devices is greater than-50 dBm, the second communication devices which are greater than-50 dBm transmit decision data at the same time or at close time, which means that the second communication devices do not receive decision data transmitted by other second communication devices, the second communication devices all serve as forwarding communication nodes, although the second communication devices cannot uniquely select the forwarding communication nodes, the second communication devices with the higher signal quality are selected as the forwarding communication nodes, and the second communication devices with the lower field strength quality are discarded.
When the forwarding communication node is selected through the second signal quality, the second signal quality of the selected forwarding communication node is not only relatively large, but also the second signal qualities among the forwarding communication nodes are close, so that the qualities of communication data of the forwarding communication nodes are close, the interference of a second communication device with poor second signal quality is prevented, and the co-frequency and co-broadcasting problems caused by the forwarding of the communication data to the next communication node are reduced. For example, when the communication data with the similar quality reaches the next communication node, the error rate of the plurality of pieces of communication data received by the next communication node is the same, and the error rate when the next communication node forwards the communication data may be similar to the error rate when receiving the communication data. If the communication data with the quality not close to the communication data reaches the next communication node, the error rates of the plurality of pieces of communication data received by the next communication node are different, so that the communication data with the high error rate affects the communication data with the low error rate, and the error rate of the communication data forwarded by the next communication node is reduced.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art will appreciate that the embodiments described in this specification are presently preferred and that no acts or modules are required by the invention.
Corresponding to the above method embodiment, an embodiment of the present invention further provides a communication node selection apparatus, which is applied to a second communication apparatus, and the structure of the communication node selection apparatus is shown in fig. 9, where the communication node selection apparatus may include: a receiving unit 10, a calculating unit 20, a determining unit 30 and a selecting unit 40.
A receiving unit 10, configured to receive communication data sent by a first communication device.
The communication data transmitted by the first communication device may include preamble data, where the preamble data is used by the first communication device to indicate that real data is to be transmitted, for example, when the communication data transmitted by the first communication device is voice data, the preamble data is transmitted before the voice data to indicate that the voice data is to be transmitted by the first communication device.
A calculating unit 20, configured to calculate a first signal quality according to the communication data sent by the first communication device.
For the first signal quality, the first signal quality may be represented by, but not limited to, a first field strength, which may be calculated according to the communication data sent by the first communication device, and for this embodiment, the calculation process is not described in detail.
A determining unit 30, configured to determine, according to the first signal quality and the identification information of the second communication apparatus, a transmission interval and a reception interval of the second communication apparatus in the first type decision window.
It can be understood that: the functions of the transmission interval and the reception interval are as follows: the second communication device transmits the decision data in the transmission interval of the first type decision window, and receives the decision data transmitted by other second communication devices in the reception interval of the first type decision window, which refers to the related description in the above method embodiment, and is not described here.
A selecting unit 40, configured to select whether the second communication device is the only first communication node based on the data transmission condition of the second communication device in the transmission interval and the data reception condition of the second communication device in the reception interval.
In the present embodiment, the second communication device transmits the decision data in the transmission section, and the same second communication device receives the decision data transmitted by another second communication device in the reception section, so that the present embodiment can select whether or not to serve as the only first communication node for the second communication device based on the data transmission situation in the transmission section and the data reception situation in the reception section of the second communication device, and the second communication device can determine whether or not to serve as the only first communication node based on the data transmission situation and the data reception situation of the second communication device.
One possible way in which the selection unit 40 makes the second communication device whether or not to act as the only first communication node is:
if the judgment data sent by other second communication devices is received before entering the sending interval, the second communication device is forbidden to be used as a first communication node; if the judgment data sent by other second communication devices is not received before entering the sending interval, but the judgment data sent by other second communication devices is received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node; and if the judgment data sent by other second communication devices are not received before entering the sending interval and the judgment data sent by other second communication devices are not received after entering the receiving interval, allowing the second communication device to be used as the only first communication node.
In this embodiment, the decision data is data that is transmitted by communication nodes between the second communication devices selectively, the type of the decision data is selected according to the type of the communication data, for example, the communication data is voice data, and the voice data is modulated and demodulated by using but not limited to a 4FSK (Frequency-shift keying) manner, so that the corresponding decision data may be +3 symbol data, the minimum duration of the +3 symbol data is a decision micro-window of the first type decision-window, and the total duration is related to the duration of the transmission interval. Under the condition that the judgment and selection micro-window is 4ms, the judgment data can be accurately received by testing the field intensity of the second communication device to be at least-110 dBm.
According to the technical scheme, the communication data sent by the first communication device is received, the first signal quality is calculated according to the communication data sent by the first communication device, the sending interval and the receiving interval of the second communication device in the first type judging and selecting window are determined according to the first signal quality and the identification information of the second communication device, whether the second communication device is used as the only first communication node or not is selected according to the data sending condition of the second communication device in the sending interval and the data receiving condition of the second communication device in the receiving interval, the data receiving condition of the second communication device in the receiving interval can indicate the data sending condition of other second communication devices in the corresponding time of the receiving interval, the only first communication node can be selected by comprehensively considering the data sending condition of the second communication device and the data sending condition of other second communication devices, and the problem of same frequency and same broadcasting of the next communication node caused by the data forwarded by the plurality of second communication devices when the plurality of second communication devices are simultaneously used as the first communication node is avoided.
And when the only first communication node is selected, the second communication device can independently judge by combining the data transmission condition of the second communication device and the data transmission condition of other second communication devices, other equipment does not need to be configured for the second communication device, the selection process is simplified, the second communication device can complete the selection of the first communication node of the communication network where the second communication device is located in a first type judging and selecting window, and excessive service frequency points and link frequency points do not need to be distributed for the second communication device, so that the resources are saved.
When the signal quality division is performed on the first type judgment window, the better the signal quality corresponding to the judgment micro-window arranged in front, so that the second communication device with the better signal quality can transmit the judgment data earlier, the better the signal quality of the second communication device, the lower the probability of receiving the judgment data transmitted by other second communication devices before entering a transmission interval, therefore, when the first communication node is selected based on the data transmission condition and the data reception condition, the second communication device with the better signal quality can be selected from all the second communication devices which can directly receive the communication data transmitted by the first communication device from the terminal, so that the second communication device with the better signal quality can be selected as the first communication node under the condition that the only first communication node can be selected, the second communication device with the better signal quality can be selected as the first communication node, the signal quality of the selected second communication device is relatively optimal, and the quality of the communication data forwarded by the second communication device is relatively optimal (for example, the reliability of the forwarded communication data and the accuracy of the forwarded data can be improved in the communication process.
If it is necessary to select a second communication device having a better signal quality from all the second communication devices that can receive the communication data transmitted by the first communication device, it is possible to divide the signal quality of a finer granularity when the first type selection window is made to correspond to the signal quality, so that the difference between the signal qualities corresponding to the same selection micro-window is reduced, and it is possible to divide the transmission interval better according to the signal quality.
The first type selection window includes a receiving interval and a transmitting interval, where the second communication device is in a receiving mode in the receiving interval, the second communication device is in a transmitting mode in the transmitting interval, and a certain time is consumed for switching from the receiving mode to the transmitting mode and from the transmitting mode to the receiving mode, so the communication node selection apparatus provided in this embodiment may further include: a control unit for controlling the second communication device to switch from the transmission mode to the reception mode before the end time of the transmission interval is reached and/or controlling the second communication device to switch from the reception mode to the transmission mode before the end time of the reception interval is reached.
The communication node selection device can select a forwarding communication node in addition to the first communication node, and the corresponding communication node selection device selects the forwarding communication node as follows:
the receiving unit 10 is further configured to receive communication data sent by the forwarding communication node.
The calculating unit 20 is further configured to calculate a second signal quality based on the communication data sent by the forwarding communication node.
The determining unit 30 is further configured to determine a receiving interval of the second communication apparatus in the second type decision window based on the second signal quality.
The selecting unit 40 is further configured to select whether the second communication device is a forwarding communication node or not based on the data reception situation of the second communication device in the reception section of the second type decision window. One way is that: if the judgment data sent by other second communication devices is received in the receiving interval of the second type judgment and selection window, the second communication device is forbidden to be used as a forwarding communication node; and if the judgment data sent by other second communication devices is not received in the receiving interval of the second type judgment window, allowing the second communication devices to serve as forwarding communication nodes.
For the above description of the selection of the forwarding communication node by the communication node selection apparatus, reference is made to the above method embodiment, and this embodiment is not described here.
In yet another aspect, an embodiment of the present invention provides a communication apparatus, which includes a processor and a storage medium, where program codes are stored in the storage medium; the processor executes the program code to cause the processor to implement any of the communication node selection methods described above.
In another aspect, an embodiment of the present invention provides a storage medium, where a computer program is stored on the storage medium, and when executed by a processor, the computer program implements any one of the above-mentioned communication node selection methods.
It should be noted that, in the present specification, the embodiments are described in a progressive or combined manner, each embodiment focuses on differences from other embodiments, and similar parts between the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and reference may be made to the partial description of the method embodiment for relevant points.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A method of communication node selection, for use in a second communications device, the method comprising:
receiving communication data sent by a first communication device, and calculating first signal quality according to the communication data sent by the first communication device;
determining a sending interval and a receiving interval of the second communication device in a first type judging and selecting window according to the first signal quality and the identification information of the second communication device;
selecting whether the second communication device is used as the only first communication node or not based on the data transmission condition of the second communication device in the transmission interval and the data reception condition of the second communication device in the reception interval;
the selecting, based on the data transmission condition of the second communication device in the transmission interval and the data reception condition of the second communication device in the reception interval, whether to serve as the only first communication node for the second communication device includes:
if receiving decision data sent by other second communication devices before entering the sending interval, forbidding the second communication device as a first communication node;
if the judgment data sent by other second communication devices are not received before entering the sending interval, but the judgment data sent by other second communication devices are received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node;
and if the judgment data sent by other second communication devices is not received before the second communication device enters the sending interval and the judgment data sent by other second communication devices is not received after the second communication device enters the receiving interval, allowing the second communication device to be used as the only first communication node.
2. The method of claim 1, wherein a start time of the transmission interval is related to a start time of an interval in the first type decision window where the first signal quality is located, and wherein an end time of the transmission interval is related to identification information of the second communication device.
3. The method of claim 2, further comprising: controlling the second communication device to switch from a transmission mode to a reception mode before reaching an end time of the transmission interval;
and/or
And controlling the second communication device to switch from a receiving mode to a transmitting mode before reaching the end time of the receiving interval.
4. The method of claim 1, further comprising:
receiving communication data sent by a forwarding communication node, and calculating second signal quality according to the communication data sent by the forwarding communication node;
determining a reception interval of the second communication device in a second type decision window based on the second signal quality;
and selecting whether the second communication device is used as a forwarding communication node or not based on the data receiving condition of the second communication device in the receiving interval of the second type judging and selecting window.
5. The method of claim 4, wherein the selecting whether the second communication device is a forwarding communication node or not based on the data reception condition of the second communication device in the reception interval of the second type decision window comprises:
if the judgment data sent by other second communication devices is received in the receiving interval of the second type judgment and selection window, the second communication device is forbidden to be used as a forwarding communication node;
and if the judgment data sent by other second communication devices is not received in the receiving interval of the second type judgment window, allowing the second communication device to be used as a forwarding communication node.
6. A communication node selection apparatus, for use in a second communication apparatus, the communication node selection apparatus comprising:
a receiving unit configured to receive communication data transmitted by a first communication apparatus;
a calculation unit configured to calculate a first signal quality from communication data transmitted by the first communication apparatus;
a determining unit, configured to determine a transmission interval and a reception interval of the second communication apparatus in a first type decision window according to the first signal quality and identification information of the second communication apparatus;
a selection unit configured to select whether the second communication apparatus is a unique first communication node based on a data transmission situation of the second communication apparatus in the transmission interval and a data reception situation of the second communication apparatus in the reception interval;
the selection unit is specifically configured to:
if the judgment data sent by other second communication devices is received before the second communication device enters the sending interval, the second communication device is forbidden to be used as a first communication node;
if the judgment data sent by other second communication devices are not received before entering the sending interval, but the judgment data sent by other second communication devices are received after entering the receiving interval, the second communication device is forbidden to be used as a first communication node;
and if the judgment data sent by other second communication devices is not received before the second communication device enters the sending interval and the judgment data sent by other second communication devices is not received after the second communication device enters the receiving interval, allowing the second communication device to be used as the only first communication node.
7. The apparatus according to claim 6, wherein the receiving unit is further configured to receive communication data sent by a forwarding communication node;
the computing unit is further configured to compute a second signal quality according to the communication data sent by the forwarding communication node;
the determining unit is further configured to determine, based on the second signal quality, a receiving interval of the second communication apparatus in a second type decision window;
the selecting unit is further configured to select, based on a data reception condition of the second communication device, whether the second communication device is a forwarding communication node in the reception interval of the second type decision window.
8. A communication apparatus comprising a processor and a storage medium having program code stored thereon;
the processor executes the program code such that the processor implements the communication node selection method of any of claims 1 to 5.
9. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out a communication node selection method according to any one of claims 1 to 5.
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