CN114697886A - Ad hoc network relay station interconnection method with multiple receiving paths - Google Patents
Ad hoc network relay station interconnection method with multiple receiving paths Download PDFInfo
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- CN114697886A CN114697886A CN202210559707.0A CN202210559707A CN114697886A CN 114697886 A CN114697886 A CN 114697886A CN 202210559707 A CN202210559707 A CN 202210559707A CN 114697886 A CN114697886 A CN 114697886A
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- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 29
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
- H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/08—Trunked mobile radio systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an interconnection method of ad hoc network relay stations with multiple receiving channels, which is characterized in that two working frequency points are configured for each relay station, and one frequency point is a common channel frequency point and is used for sending ad hoc network broadcast messages among the relay stations; the other frequency point is a service channel frequency point and is used for communication service between the relay station and the handheld station; all the service channel frequency points of the relay station are set differently; the relay station broadcasts the self number and the service channel frequency point information through the common channel frequency point, and the relay station receiving the self-organized network broadcast message lists the contained service channel frequency point in a scanning list. The method is simple to realize, realizes service intercommunication only by writing in the same common channel, controls the forwarding range and has excellent flexibility. The relay stations have no same frequency interference, a plurality of relay stations can better coexist in space, and the method is particularly suitable for large-scale field operation, such as mountain searching, fire fighting and the like.
Description
Technical Field
The invention relates to the field of digital talkback, in particular to an ad hoc network relay station interconnection method with multiple receiving paths, which aims at a multi-hop ad hoc network narrow-band PDT relay station.
Background
In the field of digital talkback, due to the limitation of the volume weight and the antenna length of the handheld station, long-distance communication cannot be performed, and a relay station or a base station is often required to forward signals to expand the communication distance. In practice, the base stations have the advantages of large capacity, convenience in interconnection of multiple base stations, good coverage effect, strong scheduling capability and the like, but the disadvantages are obvious, most base stations can be used only in fixed places and need to be opened and set in advance, the investment is large, the use is complex, and the mobility is poor. In actual emergency and task-based applications, if the telephone traffic is not high, the relay station is often used for expansion, and the relay station has the characteristics of low cost, convenience in starting, simplicity in service operation, light weight and the like, is very convenient to erect and transfer, and is deeply welcomed by the fields of emergency and the like.
From the current practical use, a single relay station can not meet the requirements of the digital talkback field step by step, and the self-networking multi-hop relay station is gradually raised. The traditional multi-hop relay station adopts a method that a plurality of relay stations share 25K Hz wide channels or double receiving channels to receive two frequency points, the relay stations are simply distinguished and forwarded through the combination of time slots and channels, a channel processing and negotiation mechanism is weak, and the situation that a plurality of relay stations transmit at the same frequency at the same time cannot be avoided under the condition that the number of the relay stations is large; the flexibility is also low in use, and when the relay stations are in a dynamic scene and are close to each other, reliable communication can be achieved only when the hop number between the relay stations is less than or equal to 3.
Disclosure of Invention
At present, the popular fixed dual-frequency-point ad hoc network relay station needs to solve the problem of multi-device transmission at the same frequency point, the relay station has the limitation of the maximum networking quantity, when the quantity of the relay stations in the same space exceeds two, the relay stations need to broadcast or negotiate at the same time, and when the quantity of the relay stations exceeds 4, the problem of signal collision caused by simultaneous transmission of head-tail link relay stations with coexisting spaces can not be avoided. Therefore, the relay station has complex technology and poor effect and is a common fault of the existing narrowband ad hoc network relay station.
In order to solve the problems in the prior art, the invention provides an interconnection method of ad hoc network relay stations with multiple receiving paths.
The technical scheme adopted by the invention is as follows: an interconnection method of ad hoc network relay stations with multiple receiving paths, the method comprising the following steps:
the first step is as follows: a user appoints a channel frequency point as a common channel frequency point, distributes a pre-configured common channel frequency point and a service channel frequency point for a plurality of relay stations participating in operation, and embeds a forwarding condition judgment rule list and timer parameters for each relay station.
The second step is that: and each relay station and the plurality of handheld stations are configured into a team, and all the handheld stations in each team and the relay stations in the same team watch the allocated service channel frequency points.
The third step: the relay station starts and loads configuration parameters at a work place, and starts an ad hoc network process after the completion, wherein the ad hoc network process comprises the following sub-processes: sending an ad hoc network broadcast message, receiving the ad hoc network broadcast message, maintaining a neighbor list and a scanning list.
The fourth step: after the ad hoc network process is started, the relay station starts a service forwarding process in parallel, and the service forwarding process comprises the following sub-processes: receiving service by fixed frequency point, scanning and receiving service, and forwarding service message. The relay station is provided with a receiving unit which is more than or equal to three receiving paths and a shunt circuit, wherein one receiving path resides in the common channel and is used for receiving the ad hoc network broadcast message of the adjacent relay station; another receiving path resides in the traffic channel for receiving the handset traffic signal; the rest receiving channels are used for scanning and receiving the service channel frequency points in the scanning list; the shunt circuit splits the received signal to the respective receive paths.
The relay station is provided with a transmitting unit having a transmitting path.
The relay station is provided with a baseband unit which consists of a protocol processing module for processing analysis and a storage module for storing parameters.
Each relay station is configured with two working frequency points, one frequency point is a common channel frequency point and is used for sending an ad hoc network broadcast message between each relay station; setting common channel frequency points of all relay stations participating in the operation to be consistent; the other frequency point is a service channel frequency point and is used for communication service between the relay station and the handheld station, and the service channel frequency points of all the relay stations are set differently; the relay station broadcasts the self number and the service channel frequency point information through the public channel frequency point, and the relay station receiving the self-organized network broadcast message lists the contained service channel frequency point in a scanning list.
The relay station obtains the service information by receiving the self service channel frequency point or scanning the service channel frequency point in the scanning list, and forwards the service information to the handheld station waiting for the service channel frequency point.
The adjacent station list maintained by the relay station takes the number of the relay station carried by the self-organizing network broadcast message received on the public channel as an entry, and the entry content comprises the number of the relay station, the last active time and the service channel frequency point; the relay station maintains the list information of the adjacent stations in the operation process, and the maintenance action comprises adding new relay station information, deleting overtime relay station information and updating the active time information of the relay station; and the relay station generates the scanning list according to the adjacent station list.
The relay station adopts a receiving mode combining fixed frequency point receiving and scanning receiving; the relay station receives the common channel frequency point and the self service channel frequency point in a fixed frequency point receiving mode, and receives the relay station service frequency point in the scanning list in a scanning mode.
In the third step, the subprocess of sending the ad hoc network broadcast message executes the following operations:
a1, setting a timer;
a2, after waiting for the timer to time out, the relay station transmits the broadcast message on a public channel;
a3, and returning to the step a1 after transmitting the self-networking broadcast message.
In the third step, the subprocess of receiving the ad hoc network broadcast message executes the following operations:
d1, the relay station starts a first receiving path, waits for a public channel to receive the self-organizing network broadcast message;
d2, after the relay station receives the ad hoc network broadcast message, the protocol processing module of the relay station processes the ad hoc network broadcast message to analyze the serial number and channel information of the relay station of the transmitting party;
d3, judging whether the self-organizing network broadcast message received by the relay station needs to be updated to the adjacent station list according to the forwarding condition judgment rule list, if the self-organizing network broadcast message meets the judgment condition and needs to be updated, sending the update message to the adjacent station list and the scanning list maintenance sub-process, otherwise, discarding the self-organizing network broadcast message received by the relay station; and then returns to step d 1.
In the third step, the adjacent station list and the scanning list maintenance sub-process execute the following operations:
a. after the relay station is started, an empty neighbor station list and a scanning list are created;
b. the relay station updates the timer according to the setting;
c. the relay station waits for the updating timer to be overtime or the ad hoc network receives the updating message sent by the subprocess;
d. if the timer is overtime, the relay station maintains the adjacent station list, the specific action is to traverse the entries in the adjacent station list, check the last active time, if the last active time exceeds the inactive timer parameter from the current maintenance time, delete the relay station entries in the adjacent station list, and delete the service channel frequency points of the relay station from the scanning list;
e. after the operation is finished, the relay station resets the updating timer and then returns to the step c;
f. if the relay station receives the updating message, checking whether a relay station entry which accords with the relay station number carried in the self-organized network broadcast message exists in an adjacent station list or not according to the updating message, if so, updating the last active time, if not, creating the relay station entry, and updating the service channel frequency point into the scanning list; and c, returning to the step c after the treatment is finished.
In the fourth step, the fixed frequency point receiving service sub-process executes the following steps:
b1, waiting for the second receiving path in the relay station in the traffic channel, and entering a receiving state;
b2, after receiving the service message, the second receiving path sends the service message to the protocol stack for judgment;
b3, the protocol stack judges whether the received service message should be forwarded according to PDT protocol and forwarding condition judgment rule list, if it accords with the forwarding condition, the sub-process of forwarding service message is executed; if the forwarding condition is not met, the second receiving path returns to step b1 to continue receiving.
In the fourth step, the sub-process of the scanning receiving service executes the following operations:
A. the rest receiving channel reads the scanning list and judges whether the next frequency point to be scanned can be obtained or not;
B. if the rest receiving path can not obtain the next frequency point to be scanned, the step A is returned after the rest receiving path is dormant;
C. if any receiving channel in the rest receiving channels can successfully obtain the next scanning frequency point, switching to the obtained scanning frequency point, marking the obtained scanning frequency point as 'scanning', wherein the scanning frequency point can not be obtained from the scanning list by other receiving channels;
D. any receiving path keeps a receiving state to receive the current channel service message;
E. if any receiving channel does not receive the service message, removing the 'scanning' mark, returning to the step A, and if the service message is received, performing the step F;
F. and any receiving path sends the received service message to the protocol stack, the protocol stack judges whether the received service message meets the forwarding condition, if not, the mark of scanning is removed, the step A is returned, if the forwarding condition is met, the service message forwarding sub-process is carried out, and after the forwarding is finished, the mark of scanning is removed, and the step A is returned.
In the fourth step, the service message forwarding sub-process executes the following operations:
c1, the baseband unit of the relay station analyzes and checks the received service message, re-encapsulates the message and sends the message to the transmission path;
c2, the transmission path forwards, analyzes and checks the verified service message on the service channel set by the relay station;
c3, the relay station judges whether the service message after analysis and verification is a service termination message, when the receiving path receiving the service message receives the service termination message, the transmitting path forwarding is stopped, and the forwarding sub-process is ended; if the received service message after the resolution check is not the service termination message, the step c1 is returned.
The invention has the following beneficial effects: the service intercommunication is realized by only writing in the same common channel without pairing or combining in advance by adopting a plurality of relay stations, and one or a group of equipment (including the relay stations and the handheld stations) or services (including voice and short messages) can be appointed or refused to be appointed by writing in a forwarding rule, so that the forwarding range is controlled, and the flexibility is excellent.
The method is not limited by the number of the relays, all the relays configured with the same common channel frequency point can communicate with each other when being close to each other, leave natural broken links, use different service frequency points, have no same frequency interference among the relays, can well coexist in space, and is particularly suitable for large-scale field operation such as mountain searching, fire fighting and other occasions. Compared with a grouping mode using frequency points, the forwarding condition judgment rule list in the method can control the service from multiple dimensions such as a handheld station number, a team number, a relay station number, a service type and the like, and has better flexibility.
Drawings
FIG. 1 is a schematic diagram of an exemplary application of an embodiment of the present invention;
FIG. 2 is a block diagram of a relay station according to an embodiment of the present invention;
fig. 3 is a sub-flowchart of a relay station periodically sending an ad hoc network broadcast message in an embodiment of the present invention;
FIG. 4 is a sub-flowchart of a relay station receiving an Ad hoc network broadcast message in an embodiment of the invention;
fig. 5 is a sub-flowchart of the relay station performing neighbor list and scan list maintenance in the embodiment of the present invention;
fig. 6 is a sub-flowchart of a relay station performing a fixed frequency point reception service in the embodiment of the present invention;
fig. 7 is a sub-flowchart of a scanning reception service performed by a relay station in the embodiment of the present invention;
fig. 8 is a sub-flowchart of forwarding a service message by a relay station in the embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the relay station in the method is provided with receiving units with more than or equal to three receiving paths, wherein one receiving path resides in the public channel and is used for receiving the ad hoc network broadcast message of the adjacent relay station; another receiving path resides in the traffic channel for receiving the handset traffic signal; the rest receiving channels are used for scanning the service channel frequency points in the list; the shunt circuit divides the received signal into each receiving path; a transmitting unit with a transmitting channel is arranged; a baseband unit is provided which is composed of a protocol processing module for processing analysis and a storage unit for storing parameters.
Each relay station is configured with two working frequency points, one frequency point is a common channel frequency point and is used for sending an ad hoc network broadcast message between each relay station; setting common channel frequency points of all relay stations participating in the operation to be consistent; the other frequency point is a service channel frequency point and is used for communication service between the relay station and the handheld station, and the service channel frequency points of all the relay stations are set differently; the relay station broadcasts the self number and the service channel frequency point information through the common channel frequency point, and the relay station receiving the self-organized network broadcast message lists the contained service channel frequency point in a scanning list.
The relay station obtains the service information by receiving the self service channel frequency point or scanning the service channel frequency point in the scanning list, and forwards the service information to the handheld station waiting for the service channel frequency point.
The adjacent station list maintained by the relay station takes the number of the relay station carried by the self-organized network broadcast message received in the public channel as an entry, and the entry content comprises the number of the relay station, the last active time and the service channel frequency point; the relay station maintains the list information of the adjacent stations in the operation process, and the maintenance action comprises adding new relay station information, deleting overtime relay station information and updating the active time information of the relay station; and the relay station generates the scanning list according to the adjacent station list.
The relay station adopts a receiving mode combining fixed frequency point receiving and scanning receiving; the relay station receives the common channel frequency point and the self service channel frequency point in a fixed frequency point receiving mode, and receives the relay station service frequency point in the scanning list in a scanning mode.
As shown in fig. 2, the relay station in the method is composed of a baseband unit, a transmitting unit, a receiving unit, an accessory unit, an antenna feeder unit, and the like. The transmitting unit of the relay station of the embodiment comprises a transmitting path and a transmitting-receiving switch, wherein the output end of the transmitting path is connected with the transmitting-receiving switch and used for modulating the baseband signal of the relay station to form a corresponding radio frequency signal and amplifying and outputting the radio frequency signal; the receiving and transmitting switch is responsible for switching to enable the antenna feeder unit to be communicated with the transmitting channel or to enable the antenna feeder unit to be communicated with the receiving unit.
The receiving unit of the relay station of this embodiment is provided with four receiving paths and a shunt circuit, the input end of the shunt circuit of the receiving unit is connected with the receiving and transmitting switch of the transmitting unit, the shunt circuit divides the signal into four receiving paths, and the receiving paths are used for receiving and demodulating the radio frequency signal to form a baseband signal of a corresponding type; the receiving unit of the relay station in this embodiment can simultaneously receive the radio frequency signals of 4 frequency points and convert the radio frequency signals into baseband signals. The output end of the transmitting channel is connected with the receiving and transmitting switch and is used for modulating the baseband signal of the relay station to form a corresponding radio frequency signal and amplifying and outputting the radio frequency signal; the receiving and transmitting switch is responsible for switching to enable the antenna feeder unit to be communicated with the transmitting channel or to enable the antenna feeder unit to be communicated with the receiving unit.
The baseband unit of the relay station has the configuration storage capacity and can store the preset frequency point, the timer parameter, the forwarding rule and the like of the relay station. The baseband unit is responsible for protocol processing, can analyze the information received by the receiving unit, judges whether the forwarding condition is in accordance with the condition, and has the capability of controlling the transmitting unit to select frequency points and time slots for transmitting.
The antenna feeder unit of the relay station is used for receiving/transmitting radio frequency signals.
The accessory units of the relay station include a power supply and a peripheral interface, etc.
The method realizes the following operation processing steps of the interconnection of the relay stations of the ad hoc network with multiple receiving paths:
the first step is as follows: a user appoints a channel frequency point as a common channel frequency point, distributes a pre-configured common channel frequency point and a service channel frequency point for a plurality of relay stations participating in operation, and embeds a forwarding condition judgment rule list and timer parameters for each relay station.
The second step is that: each relay station and the plurality of handheld stations are configured into a team, and all the handheld stations in each team and the relay stations in the same team watch the allocated service channel frequency points.
The third step: the relay station starts and loads configuration parameters at a work place, and starts an ad hoc network process after the configuration parameters are completed, wherein the ad hoc network process comprises the following sub-processes: sending an ad hoc network broadcast message, receiving the ad hoc network broadcast message, maintaining a neighbor list and a scanning list.
As shown in fig. 3, the sub-flow of periodically sending ad hoc network broadcast messages by the relay station performs the following operations:
a1, setting a timer;
a2, after the waiting timer is overtime, the relay station transmits the broadcast message on the public channel;
a3, and returning to the step a1 after transmitting the self-networking broadcast message.
As shown in fig. 4, the subroutine of receiving the ad hoc network broadcast message by the relay station performs the following operations:
d1, the relay station starts a first receiving path, waits for a public channel to receive the self-organizing network broadcast message;
d2, after the relay station receives the ad hoc network broadcast message, the protocol processing module of the relay station processes the ad hoc network broadcast message to analyze the serial number and channel information of the relay station of the transmitting party;
d3, judging whether the self-organized network broadcast message received by the relay station needs to be updated to the adjacent station list according to the forwarding condition judgment rule list, if the self-organized network broadcast message meets the judgment condition and needs to be updated, sending the update message to the adjacent station list and the scanning list maintenance sub-process, otherwise, discarding the self-organized network broadcast message received by the relay station; and then returns to step d 1.
As shown in fig. 5, the sub-flow of the relay station performing neighbor list and scan list maintenance performs the following operations:
a. after a relay station is started, an empty neighbor station list and a scanning list are created;
b. the relay station updates the timer according to the setting;
c. the relay station waits for the updating timer to be overtime or the ad hoc network receives the updating message sent by the subprocess;
d. if the timer is overtime, the relay station maintains the adjacent station list, the specific action is to traverse the entries in the adjacent station list and check the last active time, if the last active time exceeds the inactive timer parameter from the current maintenance time, the entries of the relay station are deleted from the adjacent station list, and the service channel frequency points of the relay station are deleted from the scanning list;
e. after the operation is finished, the relay station resets the updating timer and then returns to the step c;
f. if the relay station receives the updating message, checking whether a relay station entry which accords with the relay station number carried in the ad hoc network broadcast message exists in the adjacent station list according to the updating message, if so, updating the last active time, if not, creating the relay station entry, and updating the service channel frequency point into the scanning list; and c, returning to the step c after the treatment is finished.
The fourth step: after the ad hoc network process is started, the relay station starts a service forwarding process in parallel, and the service forwarding process comprises the following sub-processes: receiving service by fixed frequency point, scanning and receiving service, and forwarding service message.
As shown in fig. 6, the relay station performs the fixed frequency point receiving service sub-process and executes the following steps:
b1, waiting for the second receiving path in the relay station in the traffic channel, and entering a receiving state;
b2, after receiving the service message, the second receiving path sends the service message to the protocol stack for judgment;
b3, the protocol stack judges whether the received service message should be forwarded according to PDT protocol and forwarding condition judgment rule list, if it accords with the forwarding condition, the sub-flow of forwarding service message is executed; if the forwarding condition is not met, the second receiving path returns to step b1 to continue receiving.
As shown in fig. 7, the sub-flow of the relay station performing the scanning reception service performs the following operations:
A. reading the scanning list by the rest receiving paths (a receiving path 3 and a receiving path 4) and judging whether the next frequency point to be scanned can be obtained or not;
B. if the rest receiving channels can not obtain the next frequency point to be scanned, returning to the step A after sleeping;
C. if any receiving channel in the rest receiving channels can successfully obtain the next scanning frequency point, switching to the obtained scanning frequency point, marking the obtained scanning frequency point as 'scanning', wherein the scanning frequency point can not be obtained from the scanning list by other receiving channels;
D. any receiving path keeps a receiving state to receive the current channel service message;
E. if any receiving channel does not receive the service message, removing the 'scanning' mark, returning to the step A, if the service message is received, performing the step F;
F. and any receiving path sends the received service message to the protocol stack, the protocol stack judges whether the received service message meets the forwarding condition, if not, the mark of scanning is removed, the step A is returned, if the forwarding condition is met, the service message forwarding sub-process is carried out, and after the forwarding is finished, the mark of scanning is removed, and the step A is returned.
As shown in fig. 8, the relay station performs the service message forwarding sub-process to perform the following operations:
c1, the baseband unit of the relay station analyzes and checks the received service message, re-encapsulates the message and sends the message to the transmission path;
c2, the transmission path transmits, analyzes and checks the verified service message on the service channel set by the relay station;
c3, the relay station judges whether the service message after analysis and verification is a service termination message, when the receiving path receiving the service message receives the service termination message, the transmitting path forwarding is stopped, and the forwarding sub-process is ended; if the received service message after the resolution check is not the service termination message, the step c1 is returned.
The relay station operation processing process comprises two flows of an ad hoc network process and a service forwarding process.
After the relay station is powered on, the parameters stored in the storage unit are loaded firstly, and the parameters comprise two frequency points of the relay station, an inactive timer parameter, a period timer parameter and a forwarding condition judgment rule list. After the loading is finished, the relay station starts an ad hoc network process and a service forwarding process, which are independent from each other and are carried out simultaneously.
The ad hoc network process comprises three sub-processes, which are respectively: sending an ad hoc network broadcast message, receiving the ad hoc network broadcast message, maintaining a neighbor list and a scanning list. The service forwarding process comprises three sub-processes, which are respectively: receiving service by fixed frequency point, scanning and receiving service, and forwarding service message.
The typical application scenario of the present embodiment is shown in fig. 1:
in a typical application scenario, a team has a relay station and a plurality of handheld stations for ensuring basic communication of the mobile units. In fig. 1, the relay station 1, the handheld station MS _1A, and the handheld station MS _1B form a group 1, the relay station 2, the handheld station MS _2A, and the handheld station MS _2B, MS _2C form a group 2, and the relay station n, the handheld station MS _ nA, and the handheld station MS _ nB form a group n.
The typical relay station 1 configuration contents are as follows:
configuring the serial number of a relay station 1 to be 0x 000001;
configuring a common channel frequency point of a relay station 1 as F1 (403.025 MHz);
configuring a service channel frequency point of a relay station 1 as F2a (402.0375 MHz);
the update timer is configured for 20 seconds and the inactivity timer is 5 minutes.
Configuring a forwarding condition judgment rule list, wherein the forwarding condition judgment rule list comprises: black and white lists of numbers of other relay stations of the expected access ad hoc network, black and white lists of source numbers and target numbers and a service judgment rule, wherein the service judgment rule is as follows: permit all short messages to be forwarded across relays, etc.
And configuring the number of the handheld station, and configuring the handheld station to work at the frequency point F2 a.
The typical relay station 2 configuration content is as follows:
configuring the serial number of the relay station 2 to be 0x 000002;
configuring a public channel frequency point of a relay station 2 to be F1 (403.025 MHz);
configuring a service channel frequency point of a relay station 2 to be F2b (402.075 MHz);
the update timer is configured for 20 seconds and the inactivity timer is 5 minutes.
Configuring a forwarding condition judgment rule list, wherein the forwarding condition judgment rule list comprises: black and white lists of numbers of other relay stations expected to be accessed into the ad hoc network, black and white lists of source numbers and target numbers and a service judgment rule, wherein the service judgment rule is as follows: permit all short messages to be forwarded across relays, etc.
And configuring the number of the handheld station, and configuring the handheld station to work at the frequency point F2 b.
And so on.
In this embodiment, the forwarding condition judgment rule list of the relay station 1 includes the following rules:
the relay stations with numbers of 0x000001, 0x000002, 0x000003 and 0x000004 are permitted to access, and the relay stations with numbers of 0x000006 and 0x000007 are prohibited to access.
PDT queue number (which contains the called mobile subscriber address or the called group address) consistent services such as: all the services sent to 33320910 numbers are service numbers in teams and groups, and 33320910 numbers are forwarded in teams and groups, namely forwarded only when received by the receiving channel 2; 33320911-33320999 numbers are service numbers in the team of the non-own relay station, and are not forwarded under all conditions; the 33320900-33320910 numbers are used for service transfer communication between relay stations, and the receiving paths 2/3/4 forward the received signals.
A typical ad hoc networking process is as follows:
when a typical 4-receive-path relay station 1 works alone, the receive path 1 of the relay station 1 waits at the frequency point F1, the receive path 2 waits at the frequency point F2a, and the relay station 1 periodically sends an ad hoc network broadcast message at the frequency point F1, typically, for example, once every 1 minute, where the typical ad hoc network broadcast message includes: the relay station 1 itself has the number 0x000001, the reception channel information F2a, the frequency point (402.0375 MHz), and the like. The reception path 3 and the reception path 4 do not scan because the broadcast of the other relay station is not received. The handset MS _1A initiates a call with called group number 80020910, occupying one slot of the F2a bin. The receiving path 2 of the relay station 1 receives the call service, and the baseband module controls the transmitting unit to forward on another time slot of the F2a frequency point, and the time slot organization of the embodiment meets the PDT standard requirement.
When the relay station 2 approaches to the extent that the relay station 1 and the relay station 2 can perform message intercommunication, the relay station 2 receives the ad hoc network broadcast message of the relay station 1 at the frequency point F1, lists the relay station 1 in the neighbor station list, lists the channel F2a in the scanning list, and the receiving channel 3 of the relay station 2 resides at the frequency point F2 a. The relay station 1 receives the ad hoc network broadcast message of the relay station 2 at the frequency point F1, the relay station 1 analyzes the message to obtain the number 0x000002 and the frequency point F2b of the relay station 2, and the number 0x000002 is judged according to the forwarding condition judgment rule; and as 0x000002 meets the configured forwarding condition judgment rule, the relay station 1 stores the number 0x000002 and the corresponding service channel frequency point F2b into a neighbor station list according to the judgment result, and lists the frequency point F2b into a scanning list. If the relay station 1 receives the relay station ad hoc network broadcast message which does not conform to the forwarding condition judgment rule, the relay station is discarded and is not stored in the adjacent station list. When the F2b bin is added to the scan list of the relay station 1, the reception path 3 of the relay station 1 cyclically scans the F2b bin, and the reception path 4 remains in an unscanned state. The relay station 2 similarly scans the F2a frequency point in its own reception path 3.
When the hand-held station MS _1A initiates a voice call with a called group number of 33330900 at a frequency point F2a, the repeater 1 forwards the call at a frequency point F2a, and the hand-held station MS _1B receives the call and plays the voice; the relay station 2 receives the signal through the self receiving channel 3, judges that the call meets the forwarding condition judgment rule, and sends the signal to the handheld station MS _2A, the handheld station MS _2B and the handheld station MS _2C through the F2B frequency point, at this time, the receiving channel 3 of the relay station 1 receives the service on the F2B frequency point, and finds that the service is the same as the existing transmission service through judgment and is the service processed by the relay station, so that the forwarding is not repeated. When the handset MS _1A finishes talking on hook and the relay station 1 receives the call end message (LC _ Terminal), the relay station 1 forwards the message, stops forwarding the service after forwarding the message, and instructs the receiving path 3 to continue scanning. Similarly, the relay station 2 receives the message, and stops forwarding the service after forwarding the message, and instructs the receiving path 3 to continue scanning.
When a relay station n approaches a relay station 2, at a frequency point F1, the relay station n receives an ad hoc network broadcast message of the relay station 2, and updates an adjacent station list and a scanning list, a receiving path 3 resides in a frequency point F2b, the relay station 2 receives the ad hoc network broadcast message of the relay station n, and the receiving path 3 and the receiving path 4 cyclically scan the frequency points F2a, F2c, F2d, and F2e, …, F2N, for example: the receiving path 3 scans the frequency point of F2a, the receiving path 4 scans the frequency point of F2c, after 60 milliseconds, the receiving path 3 scans the frequency point of F2d, the receiving path 4 scans the frequency point of F2e, and so on.
In a typical multi-relay scanning scenario, when the receiving path 3 of the relay 1 scans the F2d frequency point, if a service message, such as PDT voice header, containing the called group number 33320910 is received, it resides in the current frequency point and reports the received voice header to the protocol processing unit. The reception path 4 continues to scan the F2e frequency bin and subsequent frequency bins.
And after the protocol processing unit judges that the service needs to be forwarded, the protocol processing unit controls the transmission path to forward the service on the frequency point F2 a. When the receiving path 3 receives the service end message, the protocol processing unit controls the transmitting path to stop forwarding on the frequency point of F2a, and instructs the receiving path 3 to recover the state of cooperative scanning with the receiving path 4.
Claims (9)
1. An ad hoc network relay station interconnection method with multiple receiving paths, characterized by the following steps:
the first step is as follows: a user appoints a channel frequency point as a common channel frequency point, distributes a pre-configured common channel frequency point and a service channel frequency point for a plurality of relay stations participating in operation, and embeds a forwarding condition judgment rule list and timer parameters for each relay station;
the second step is that: each relay station and the plurality of handheld stations are configured into a team, and all the handheld stations in each team and the relay stations in the same team watch the allocated service channel frequency points;
the third step: the relay station starts and loads configuration parameters at a work place, and starts an ad hoc network process after the completion, wherein the ad hoc network process comprises the following sub-processes: sending an ad hoc network broadcast message, receiving the ad hoc network broadcast message, maintaining an adjacent station list and a scanning list;
the fourth step: after the self-networking process of the relay station is started, a service forwarding process is started in parallel, and the service forwarding process comprises the following sub-processes: receiving service at fixed frequency point, scanning and receiving service, and forwarding service message; the relay station is provided with a receiving unit which is more than or equal to three receiving paths and a shunt circuit, wherein one receiving path resides in the common channel and is used for receiving the ad hoc network broadcast message of the adjacent relay station; another receiving path resides in the traffic channel for receiving the handset traffic signal; the rest receiving channels are used for scanning and receiving the service channel frequency points in the scanning list; the shunt circuit divides the received signal into each receiving path;
the relay station is provided with a transmitting unit with a transmitting path;
the relay station is provided with a baseband unit consisting of a protocol processing module for processing analysis and a storage module for storing parameters;
each relay station is configured with two working frequency points, one frequency point is a common channel frequency point and is used for sending an ad hoc network broadcast message between each relay station; setting common channel frequency points of all relay stations participating in the operation to be consistent; the other frequency point is a service channel frequency point and is used for communication service between the relay station and the handheld station, and the service channel frequency points of all the relay stations are set differently; the relay station broadcasts the self number and the service channel frequency point information through the common channel frequency point, and the relay station receiving the self-organized network broadcast message lists the contained service channel frequency points in a scanning list;
the relay station obtains the service information by receiving the self service channel frequency point or scanning the service channel frequency point in the scanning list, and forwards the service information to the handheld station waiting for the service channel frequency point.
2. The method for interconnecting the ad hoc networks with multiple receiving paths according to claim 1, wherein the neighbor list maintained by the relay station takes the number of the relay station carried by the ad hoc network broadcast message received in the common channel as an entry, and the entry content includes the number of the relay station, the last active time and the frequency point of the service channel; the relay station maintains the list information of the adjacent stations in the operation process, and the maintenance action comprises adding new relay station information, deleting overtime relay station information and updating the active time information of the relay station; and the relay station generates the scanning list according to the adjacent station list.
3. The method for interconnecting the ad hoc network relay stations with multiple receiving channels according to claim 1, wherein the relay stations adopt a receiving mode combining fixed frequency point receiving and scanning receiving; the relay station receives the common channel frequency point and the self service channel frequency point in a fixed frequency point receiving mode, and receives the relay station service frequency point in the scanning list in a scanning mode.
4. The method as claimed in claim 1, wherein in the third step, the sub-process of sending the ad hoc network broadcast message performs the following operations:
a1, setting a timer;
a2, after waiting for the timer to time out, the relay station transmits the broadcast message on a public channel;
a3, and returning to the step a1 after transmitting the self-networking broadcast message.
5. The method of claim 1, wherein in the third step, the received ad hoc network broadcast message sub-process performs the following operations:
d1, the relay station starts a first receiving path, waits for a public channel to receive the self-organizing network broadcast message;
d2, after the relay station receives the ad hoc network broadcast message, the protocol processing module of the relay station processes the ad hoc network broadcast message to analyze the serial number and channel information of the relay station of the transmitting party;
d3, judging whether the self-organizing network broadcast message received by the relay station needs to be updated to the adjacent station list according to the forwarding condition judgment rule list, if the self-organizing network broadcast message meets the judgment condition and needs to be updated, sending the update message to the adjacent station list and the scanning list maintenance sub-process, otherwise, discarding the self-organizing network broadcast message received by the relay station; and then returns to step d 1.
6. The method for interconnecting relay stations in an ad hoc network with multiple receiving paths as claimed in claim 1, wherein in the third step, the neighbor list and scan list maintenance sub-process performs the following operations:
a. after the relay station is started, an empty neighbor station list and a scanning list are created;
b. the relay station updates the timer according to the setting;
c. the relay station waits for the updating timer to be overtime or the ad hoc network receives the updating message sent by the subprocess;
d. if the timer is overtime, the relay station maintains the adjacent station list, the specific action is to traverse the entries in the adjacent station list, check the last active time, if the last active time exceeds the inactive timer parameter from the current maintenance time, delete the relay station entries in the adjacent station list, and delete the service channel frequency points of the relay station from the scanning list;
e. after the operation is finished, the relay station resets the updating timer and then returns to the step c;
f. if the relay station receives the updating message, checking whether a relay station entry which accords with the relay station number carried in the self-organized network broadcast message exists in an adjacent station list or not according to the updating message, if so, updating the last active time, if not, creating the relay station entry, and updating the service channel frequency point into the scanning list; and c, returning to the step c after the treatment is finished.
7. The method according to claim 1, wherein in the fourth step, the sub-process of the fixed frequency point reception service performs the following steps:
b1, waiting for the second receiving path in the relay station in the traffic channel, and entering a receiving state;
b2, after receiving the service message, the second receiving path sends the service message to the protocol stack for judgment;
b3, the protocol stack judges whether the received service message should be forwarded according to PDT protocol and forwarding condition judgment rule list, if it accords with the forwarding condition, the sub-process of forwarding service message is executed; if the forwarding condition is not met, the second receiving path returns to step b1 to continue receiving.
8. The method of claim 1, wherein in the fourth step, the sub-process of the scan receive service performs the following operations:
A. the rest receiving channel reads the scanning list and judges whether the next frequency point to be scanned can be obtained or not;
B. if the rest receiving path can not obtain the next frequency point to be scanned, the step A is returned after the rest receiving path is dormant;
C. if any receiving channel in the rest receiving channels can successfully obtain the next scanning frequency point, switching to the obtained scanning frequency point, marking the obtained scanning frequency point as 'scanning', wherein the scanning frequency point can not be obtained from the scanning list by other receiving channels;
D. any receiving path keeps a receiving state to receive the current channel service message;
E. if any receiving channel does not receive the service message, removing the 'scanning' mark, returning to the step A, and if the service message is received, performing the step F;
F. and any receiving path sends the received service message to the protocol stack, the protocol stack judges whether the received service message meets the forwarding condition, if not, the mark of scanning is removed, the step A is returned, if the forwarding condition is met, the service message forwarding sub-process is carried out, and after the forwarding is finished, the mark of scanning is removed, and the step A is returned.
9. The method of claim 1, wherein in the fourth step, the service message forwarding sub-process performs the following operations:
c1, the baseband unit of the relay station analyzes and checks the received service message, repackages the service message, and sends the repackaged service message to the transmission path;
c2, the transmission path transmits, analyzes and checks the verified service message on the service channel set by the relay station;
c3, the relay station judges whether the service message after analysis and verification is a service termination message, when the receiving path receiving the service message receives the service termination message, the transmitting path forwarding is stopped, and the forwarding sub-process is ended; if the received service message after the resolution check is not the service termination message, the step c1 is returned.
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