CN110719652B - Wireless ad hoc network method for mobile base station - Google Patents
Wireless ad hoc network method for mobile base station Download PDFInfo
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- CN110719652B CN110719652B CN201910042006.8A CN201910042006A CN110719652B CN 110719652 B CN110719652 B CN 110719652B CN 201910042006 A CN201910042006 A CN 201910042006A CN 110719652 B CN110719652 B CN 110719652B
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- 230000011664 signaling Effects 0.000 claims abstract description 93
- 238000012423 maintenance Methods 0.000 claims description 38
- 238000004891 communication Methods 0.000 abstract description 10
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- H—ELECTRICITY
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- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
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- 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
Abstract
The invention discloses a wireless ad hoc network method of a mobile base station. It comprises the following steps: the master node base station sends signaling RMAINT1, the base station receiving the signaling RMAINT1 sends registration signaling, the master node base station registers all base stations corresponding to the received registration signaling, and selects a registration base station with the best signal quality or the nearest geographic position in the forward direction and/or the reverse direction as the node base station of the final stage in the corresponding direction; the node base station of the last stage sends a signaling RMAINT3, the unregistered base station receiving the signaling RMAINT3 sends a registration signaling, the main node base station selects a base station with the best signal quality or the nearest geographical position from the registered base stations as the next-stage node base station of the last stage, and if the node base station is an end node, the ad hoc network is ended after one end node is selected. The invention ensures that the mobile base station can have the capability of wireless networking communication at any time without any parameter configuration and moving at any time.
Description
Technical Field
The invention relates to the technical field of base station ad hoc networks, in particular to a wireless ad hoc network method of a mobile base station.
Background
To increase the coverage area, a narrowband communication system is generally composed of multiple base stations. These base stations communicate over narrowband radio channels serving mobile stations. The base stations are networked with each other through various link technologies to serve communication between the base stations. Common link technologies are divided into wireless and wired. Wireless multi-purpose microwave equal broadband transmission. By adopting broadband transmission, more voice data and control signaling data of multiple channels between base stations can be transmitted. But in some cases these wired and wireless links are not available. Such as the need for temporary rapid deployment in disaster emergency situations.
There are practical cases where the link connection between base stations is performed using channels of the same frequency band of the narrowband communication system. However, the low rate of the narrow-band transmission causes a long delay, and the narrow-band wireless link is complicated in networking due to the defects that more frequency points are needed for eliminating interference in multi-hop.
Disclosure of Invention
The present invention provides a wireless ad hoc network method for a mobile base station, which enables the mobile base station to have the capability of wireless networking communication at any time without any parameter configuration and moving at any time.
In order to solve the problems, the invention adopts the following technical scheme:
the invention relates to a wireless ad hoc network method of a mobile base station, which comprises the following steps:
s1: the main node base station sends broadcast link maintenance signaling RMAINT 1;
s2: the base station receiving the broadcast link maintenance signaling RMAINT1 sends the registration signaling for a period of time;
s3: the master node base station waits for a period of time to register all base stations corresponding to all received registration signaling, and then, a registered base station with the best uplink and downlink signal quality or the nearest geographic position to the master node base station is selected as a node base station of a final stage in the corresponding direction in the forward direction and/or the reverse direction of the master node base station;
s4: the main node base station transmits a broadcast link maintenance signaling RMAINT2, and the node base station which is not positioned at the final stage forwards the broadcast link maintenance signaling RMAINT 2;
s5: after receiving the broadcast link maintenance signaling RMAINT2, the node base station of the last stage starts to send broadcast link maintenance signaling RMAINT 3;
s6: the unregistered base station that received broadcast link maintenance signaling RMAINT3 issues registration signaling;
s7: after receiving the registration signaling sent by the unregistered base station, the node base station of the final stage transmits the registration signaling to the main node base station, and the main node base station selects a base station with the best uplink and downlink signal quality or the closest geographical position to the node base station of the final stage from the registered base stations after waiting for a period of time to serve as the next-stage node base station of the final stage;
the master node base station judges whether the next-stage node base station is an end node or not, if the next-stage node base station is the end node, the next-stage node base station is used as a first end node base station, then the master node base station judges whether other base stations except the first end node base station exist in the current base station registration or not, if not, the ad hoc network is ended, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the last-stage node base station is selected from the base stations and used as a second end node base station, and the ad hoc network is ended; if the next-stage node base station is not the end node, the next-stage node base station is treated as a new final-stage node base station, and then it goes to step S5.
In the scheme, the main node base station is a central node, the main node base station is connected with the switch, and uplink information of other node base stations is transmitted to the main node base station. The node base station between the master node base station and the end node base station is an intermediate node base station, and needs to transmit uplink and downlink information of other node base stations besides transmitting self information. The end node base station is located at the very end of the wireless link, and only receives downlink link data and transmits its own link data.
In the formed network, the number of end node base stations in a certain direction can be one, and is at most 2. The primary node base station may simultaneously be an end node base station. Any node base station may be the source node from which the transmission of information begins.
Preferably, the step S3 further includes the steps of: the master node base station judges whether a final node base station in the forward direction and/or the reverse direction is an end node in the direction, if so, the final node base station is taken as a first end node base station in the direction, then, the master node base station judges whether other base stations except the first end node base station exist in the base station registration in the direction, if not, the ad hoc network is ended, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the master node base station is selected from the base stations and taken as a second end node base station in the direction, and the ad hoc network is ended; if not, step S4 is executed next.
Preferably, the broadcast link maintenance signaling RMAINT1 includes the following information: information indicating that the node itself is a master node, a time slot number used by the node itself, and an access direction of a subordinate node base station which invites unregistered subordinate base stations to register.
Preferably, the broadcast link maintenance signaling RMAINT2 includes the following information: and informing the current ad hoc network access state, confirming the position of the terminal node base station, and prohibiting the terminal node base station from accessing the subordinate node base station.
Preferably, the broadcast link maintenance signaling RMAINT3 includes the following information: information indicating that the node is not the master node, a time slot number used by the node, and an access direction of an unregistered subordinate base station.
Preferably, when there are two end node base stations in a certain direction, the master node base station configures the two end node base stations in an odd-even operation mode.
Preferably, the master node base station initiates heartbeat signaling at regular time or non-regular time, the indication in the heartbeat signaling is downlink, the subordinate base station transmits the heartbeat signaling, when the heartbeat signaling is transmitted to the node base station at the upper stage of the terminal node base station, the node base station designates a certain terminal node base station to transmit heartbeat backhaul signaling, the designated terminal node base station transmits the heartbeat backhaul signaling, the indication in the heartbeat backhaul signaling is uplink, if the certain node base station finds that no heartbeat of the subordinate node base station exists, an uplink report is transmitted to the master node base station.
Preferably, a link channel between the node base stations adopts a wireless channel with a frequency interval of 25KHz, one frame is divided into four time slots on the wireless channel with the frequency interval of 25KHz, the four time slots are sequentially a time slot 1, a time slot 2, a time slot 3 and a time slot 4, and each node base station is allocated one of the four time slots for receiving/transmitting data;
the node base station in the ad hoc network allocates the use time slot according to the following rules: the time slots allocated to any three adjacent node base stations are different from each other, the time slots allocated to any four adjacent node base stations are different from each other, any one node base station is selected from the ad hoc network, and if the previous node base station of the node base station uses the time slot 1, the next node base station of the node base station uses the time slot 2; if the previous-stage base station of the node base station uses the time slot 2, the next-stage node base station of the node base station uses the time slot 1; if the previous node base station of the node base station uses the time slot 3, the next node base station of the node base station uses the time slot 4; if the node base station of the previous stage of the node base station uses the time slot 4, the node base station of the next stage of the node base station uses the time slot 3.
The node base stations transmit and use 1 frequency point, and adopt TDMA link relay bidirectional link of 25k channel and 4 time slots. For example: the ad hoc network is formed by connecting five node base stations in a relay bidirectional mode, the five node base stations are a node base station 1, a node base station 2, a node base station 3, a node base station 4 and a node base station 5 in sequence, the node base station 1 uses a time slot 1, the node base station 2 uses a time slot 3, the node base station 3 uses a time slot 2, the node base station 4 uses a time slot 4 and the node base station 5 uses a time slot 1, the channel allocation method is met, the maximum delay of the ad hoc network is 165ms, and the average delay is 117 ms. If the existing channel allocation method is adopted, the node base station 1, the node base station 2, the node base station 3, the node base station 4, and the node base station 5 use the time slot 1, the time slot 2, the time slot 3, the time slot 4, and the time slot 5, respectively, the maximum delay time is 240ms, and the average delay time is 150 ms.
Preferably, the node base station locally forwards a radio channel using 12.5KHz frequency intervals, and divides a frame into two time slots on the radio channel using 12.5KHz frequency intervals.
The node base station locally forwards and uses 1 pair of frequency points for uplink and downlink, and a TDMA access mode of 12.5KHz channels and two time slots is adopted. The node base stations in the ad hoc network, the forward node base stations and the reverse node base stations adjacent to the link thereof are continuously transmitted in time slot 1 and time slot 2, or time slot 3 and time slot 4, which are exactly aligned with the time slot 1 or time slot 2 of the local TDMA of 2 time slots with 12.5k bandwidth.
Preferably, the method for the master node base station to determine whether a certain node base station is an end node is as follows: if the node base station of the node base station is not effectively registered within the set time EACK _ Timer, the node base station is judged to be the end node.
Preferably, node base stations except the main node base station and the end node base station in the ad hoc network are intermediate node base stations;
the master node base station grasps the following information: knowing that the node is a main node, the forward and reverse network depths and the equipment physical address and ID of each node base station;
the master node base station is capable of: canceling registration of a subordinate node base station, inviting the subordinate node base station to register again, wherein the registration of the subordinate node base station comprises common registration and authentication registration, and a certain node base station is designated as a single-frequency-hop end node base station;
the end node base station grasps the following information: the node can be determined to be the terminal node base station, and whether the adjacent node base station is the main node base station or not, the physical address and the ID of the equipment, the network depth of the whole network, the ID of the adjacent node base station in the uplink direction and the odd-even working mode of the node can be obtained;
the end node base station is capable of: self node base station registration, sending signaling according to the odd-even working mode of the node base station, and receiving signaling related to the node base station; if the registration of the lower node base station is found, the registration signaling is forwarded, and the lower node base station is converted into an intermediate node base station after the registration is successful;
the intermediate node base station grasps the following information: whether an adjacent node base station is a main node base station or not, the physical address and the ID of equipment of the adjacent node base station, the network depth of the whole network, the physical address and the ID of the equipment of the adjacent node base station in the downlink direction and the physical address and the ID of the equipment of the adjacent node base station in the uplink direction can be obtained, and if the adjacent node base station is a terminal node base station, the odd-even working mode of the terminal node base station is mastered;
the intermediate node base station is capable of: registering a self node base station, transmitting information sent by an adjacent node base station, canceling registration of a subordinate node base station, and inviting the subordinate node base station to register again; if the neighboring node base station is an end node base station, the parity mode of operation of the end node base station may be assigned and modified.
The invention has the beneficial effects that: through the dynamic broadcast mechanism of the fixed base station, the mobile base station does not need any parameter configuration, can move at any time, has the capability of wireless networking communication at any time, and has the advantages of high transmission rate, low time delay and less used frequency points.
Drawings
FIG. 1 is a schematic diagram of an ad hoc one-hop model;
FIG. 2 is a schematic diagram of an ad hoc networking two-hop model;
FIG. 3 is a schematic diagram of an ad hoc networking three-hop model;
FIG. 4 is a schematic diagram of an ad hoc networking four-hop model;
FIG. 5 is a schematic diagram of a one-frame four-slot channel employed between node base stations in an ad hoc network;
fig. 6 is a schematic diagram of a one-frame two-slot channel used for local forwarding by a node base station.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the wireless ad hoc network method of the mobile base station of the embodiment comprises the following steps:
s1: the main node base station sends broadcast link maintenance signaling RMAINT 1;
s2: the base station receiving the broadcast link maintenance signaling RMAINT1 transmits the registration signaling for a period of time (RREG _ Timer);
s3: after receiving the registration signaling of a certain base station, the main node base station gives an intermediate response WACK, waits for a period of time (RACK _ Timer) to register all base stations corresponding to the received registration signaling (the broadcast link maintenance signaling RMAINT1 may be repeatedly sent for many times in the period), then selects a base station with the best uplink and downlink signal quality or the closest registration of the geographic position to the main node base station as a node base station of a final stage in the corresponding direction in the forward direction and/or the reverse direction of the main node base station, gives a RACKD positive response to the node base station, and considers that the response is not given (refused) to the other base stations or the base station receives the invalid RACKD;
the master node base station judges whether a final node base station in the forward direction and/or the reverse direction is an end node in the direction, if so, the final node base station is taken as a first end node base station in the direction, then, the master node base station judges whether other base stations except the first end node base station exist in the base station registration in the direction, if not, the ad hoc network is ended, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the master node base station is selected from the base stations and taken as a second end node base station in the direction, and the ad hoc network is ended; if not, then go to step S4;
s4: the main node base station transmits a broadcast link maintenance signaling RMAINT2, and the node base station which is not positioned at the final stage forwards the broadcast link maintenance signaling RMAINT 2;
s5: after receiving the broadcast link maintenance signaling RMAINT2 (transmitted by the main node base station or forwarded by the previous node base station), the last node base station starts to transmit broadcast link maintenance signaling RMAINT 3;
s6: the unregistered base station that received broadcast link maintenance signaling RMAINT3 issues registration signaling;
s7: after receiving the registration signaling sent by the unregistered base station, the final node base station transmits the registration signaling to the main node base station, the registered base stations regard the transmission as an intermediate response WACK, the main node base station waits for a period of time (RACK _ Timer), selects a base station (in the direction of the final node base station) with the best uplink and downlink signal quality or the closest geographical position to the final node base station from the registered base stations as the next-level node base station of the final node base station, gives a RACKD positive response, and considers that the rest base stations give (refuse) the response or the base stations receive the invalid RACKD;
the master node base station judges whether the next-stage node base station is an end node or not, if the next-stage node base station is the end node, the next-stage node base station is used as a first end node base station, then the master node base station judges whether other base stations except the first end node base station exist in the current base station registration or not, if not, the ad hoc network is finished, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the last-stage node base station is selected from the base stations and used as a second end node base station, and the ad hoc network is finished; if the next-stage node base station is not the end node, the next-stage node base station is treated as a new final-stage node base station, and then it goes to step S5.
The method for judging whether a node base station is an end node by a main node base station is as follows: if the node base station of the node base station is not effectively registered within the set time EACK _ Timer, the node base station is judged to be the end node.
When two end node base stations exist in a certain direction, the main node base station configures the parity operation mode for the two end node base stations.
A link channel between node base stations adopts a wireless channel with a frequency interval of 25KHz, a frame is divided into four time slots on the wireless channel with the frequency interval of 25KHz, the four time slots are a time slot 1, a time slot 2, a time slot 3 and a time slot 4 in sequence, and each node base station is allocated one of the four time slots for receiving/transmitting data;
the node base station in the ad hoc network allocates the use time slot according to the following rules: any adjacent three node base stations are distributed with different time slots and any adjacent four node base stations are distributed with different time slots, any node base station is selected from the ad hoc network, and if the previous node base station of the node base station uses the time slot 1, the next node base station of the node base station uses the time slot 2; if the previous-stage base station of the node base station uses the time slot 2, the next-stage node base station of the node base station uses the time slot 1; if the previous node base station of the node base station uses the time slot 3, the next node base station of the node base station uses the time slot 4; if the node base station of the previous stage of the node base station uses the time slot 4, the node base station of the next stage of the node base station uses the time slot 3.
The node base station locally forwards a radio channel using 12.5KHz frequency spacing, and divides a frame into two time slots on the radio channel of 12.5KHz frequency spacing.
In the scheme, the main node base station is a central node, the main node base station is connected with the switch, and uplink information of other node base stations is transmitted to the main node base station. The node base station between the master node base station and the end node base station is an intermediate node base station, and needs to transmit uplink and downlink information of other node base stations besides transmitting self information. The end node base station is located at the very end of the wireless link, and only receives downlink link data and transmits its own link data.
In the formed network, the number of end node base stations in a certain direction can be one, and is at most 2. The primary node base station may simultaneously be an end node base station. Any node base station may be the source node from which the transmission of information begins.
The ad hoc network becomes a schematic diagram of a one-hop model, as shown in fig. 1. In the figure, the number marked in the center of the circle represents the number of the used time slot, the main node base station uses the time slot 2, the main node base station is respectively accessed into two end node base stations in the forward direction and the reverse direction, and f is used between the main node base station and the end node base station 3 Frequency communication; the two end node base stations in the same direction respectively use odd time slots or even time slots when signaling is reported so as to avoid collision; when the voice data is allowed to report, the odd-even time slot is not divided, and the time slot is completely occupied.
The ad hoc network forms a two-hop model as shown in fig. 2. In the figure, the numbers marked in the centers of circles indicate the number of the used time slots, the time slot 2 is used by the main node base station, and f is used between the node base stations 3 Frequency communication. Ad hoc networking is a three-hop model, as shown in fig. 3. In the figure, the numbers marked in the centers of circles indicate the number of the used time slots, the time slot 1 is used by the main node base station, and f is used between the node base stations 3 Frequency communication. The ad hoc network forms a four-hop model as shown in fig. 4. In the figure, the numbers marked in the centers of circles indicate the number of the used time slots, the time slot 1 is used by the main node base station, and f is used between the node base stations 3 Frequency communication.
The node base stations transmit and use 1 frequency point, adopt TDMA link relay bidirectional link of 25k channel and 4 time slots, as shown in figure 5, four time slots are time slot 1, time slot 2, time slot 3 and time slot 4 in turn,
for example: the ad hoc network is formed by connecting five base stations in a relay bidirectional mode, wherein the five base stations are a node base station 1, a node base station 2, a node base station 3, a node base station 4 and a node base station 5 in sequence.
The channel allocation method is adopted: node base station 1 uses time slot 1, node base station 2 uses time slot 3, node base station 3 uses time slot 2, node base station 4 uses time slot 4, node base station 5 uses time slot 1, transmission delay is shown in table one,
The existing channel allocation method is adopted: node base station 1 uses time slot 1, node base station 2 uses time slot 2, node base station 3 uses time slot 3, node base station 4 uses time slot 4, node base station 5 uses time slot 1, transmission delay is shown in table two,
From table one, it can be seen that the maximum latency of the ad hoc network is 165ms, and the average latency is 117 ms. From table two, it can be seen that the maximum delay of the ad hoc network is 240ms, and the average delay is 150 ms. Therefore, the method of the invention improves the transmission rate of the narrowband ad hoc network and has lower time delay.
The node base station locally forwards and uses 1 pair of frequency points for uplink and downlink, and adopts a TDMA access mode of a 12.5KHz channel and two time slots, as shown in fig. 6, wherein the two time slots are a time slot 1 and a time slot 2 in sequence. In the node base station in the ad hoc network adopting the method, the forward node base station and the reverse node base station adjacent to the link of the node base station are continuously transmitted in time slots 1 and 2 or continuously transmitted in time slots 3 and 4, and are just aligned with the time slot 1 or the time slot 2 of the TDMA of 2 time slots of the local 12.5k bandwidth.
Broadcast link maintenance signaling RMAINT1 includes the following information: information indicating that the node itself is a master node (the transmission source address is the same as the address of the base station of the upper node); the time slot number used by itself; inviting unregistered subordinate base stations to register (the destination address is a broadcast address); access direction (forward or reverse or bi-directional) of the base station of the subordinate node.
Broadcast link maintenance signaling RMAINT2 includes the following information: informing the current access state of the ad hoc network (allowing forward access, allowing reverse access, allowing bidirectional access, forbidding access (accessed)); and confirming the position of the end node base station, and prohibiting the end node base station from accessing the lower node base station (the last node base station can continue accessing by changing frequency points, the target address is the last node base station address, and the source address is the special gateway address).
Broadcast link maintenance signaling RMAINT3 includes the following information: information indicating that the node is not a master node (the transmission source address is different from the address of the base station of the upper node); the number of the time slot used by the user; inviting unregistered lower base stations to register (the destination address is a broadcast address); access direction (forward or reverse) of the base station of the subordinate node.
The main node base station initiates heartbeat signaling at fixed time or non-fixed time, the indication in the heartbeat signaling is downlink, the subordinate base station transmits the heartbeat signaling, when the heartbeat signaling is transmitted to the node base station at the upper stage of the terminal node base station, the node base station designates a certain terminal node base station to transmit heartbeat backhaul signaling (the destination address is the designated terminal node base station address), the designated terminal node base station transmits the heartbeat backhaul signaling, the indication in the heartbeat backhaul signaling is uplink, if the certain node base station finds that no heartbeat of the subordinate node base station exists, an uplink report is transmitted to the main node base station.
Node base stations except the main node base station and the end node base station in the ad hoc network are intermediate node base stations.
The master node base station grasps the following information: knowing that it is the master node (pre-parameter programming validation); network depth in the forward and reverse directions (via registration with other node base stations); the physical address and ID of each node base station (the physical address is reported in the registration signaling of each node base station, and the ID is allocated by the main node base station).
The master node base station is capable of: canceling the registration of the lower node base station; inviting the subordinate node base stations to re-register (for example, when there are 2 subordinate node base stations in the same direction, after re-registering, the parity work mode can be allocated); the registration of the lower node base station can select common registration, and also can carry out authentication registration, and the registration keeps the bidirectional authentication function; and designating a certain node base station as a single-frequency-hop end node base station.
The end node base station grasps the following information: being able to determine that it is an end node base station (transmitting link maintenance signaling a number of times after registration is successful without the subordinate node base station registering or being designated by the master node base station); whether the adjacent node base station is a main node base station or not can be known (the main node base station is the destination of the uplink signaling when the transmission source address is the same as the address of the superior node in the link maintenance signaling transmitted by the adjacent node base station is found); the physical address (factory parameter programming setting) and ID (allocated by the main node base station) of the device per se; network depth of the whole network (informed by the master node); the ID of the neighboring node base station in the uplink direction (the ID of the neighboring node base station is known in the link maintenance signaling); parity mode of operation for the node (assigned by the base station of the neighboring node in the uplink direction).
The end node base station is capable of: self node base station registration (after receiving a link maintenance signaling of a superior node base station); sending a signaling according to the odd-even working mode of the node base station; receiving signaling related to a local node base station; if the registration of the lower node base station is found, the registration signaling is forwarded, and the lower node base station is converted into the intermediate node base station after the registration of the lower node base station is successful.
The intermediate node base station grasps the following information: whether the adjacent node base station is a main node base station or not can be known (the main node base station is the destination of the uplink signaling when the transmission source address is the same as the address of the upper node base station in the link maintenance signaling transmitted by the adjacent node base station is found); the physical address (factory parameter programming setting) and ID (allocated by the main node base station) of the device per se; network depth of the whole network (informed by the master node base station); the physical address (reported in the node base station registration signaling) and ID (known when distributed and issued by the master node) of the equipment of the adjacent node base station in the downlink direction; the device physical address and ID of the neighboring node base station in the uplink direction (the ID of the neighboring node base station is known in the link maintenance signaling); if the neighboring node base station is an end node base station, the parity operating mode of the end node base station is grasped (the selection of its parity operating mode is assigned by the intermediate node base station).
The intermediate node base station is capable of: self node base station registration (after receiving a link maintenance signaling of a superior node base station); transmitting information sent by a base station of an adjacent node; canceling the registration of the lower node base station; inviting the subordinate node base stations to re-register (for example, when there are 2 subordinate node base stations, after re-registering, the parity work mode can be allocated); if the neighboring node base station is an end node base station, the parity mode of operation of the end node base station may be assigned and modified.
Claims (10)
1. A wireless ad hoc network method of a mobile base station, comprising the steps of:
s1: the main node base station sends broadcast link maintenance signaling RMAINT 1;
s2: the base station receiving the broadcast link maintenance signaling RMAINT1 sends the registration signaling for a period of time;
s3: the master node base station waits for a period of time to register all base stations corresponding to all received registration signaling, and then, a registered base station with the best uplink and downlink signal quality or the nearest geographic position to the master node base station is selected as a node base station of a final stage in the corresponding direction in the forward direction and/or the reverse direction of the master node base station;
s4: the main node base station transmits a broadcast link maintenance signaling RMAINT2, and the node base station which is not positioned at the final stage forwards the broadcast link maintenance signaling RMAINT 2;
s5: after receiving the broadcast link maintenance signaling RMAINT2, the node base station of the last stage starts to send broadcast link maintenance signaling RMAINT 3;
s6: the unregistered base station that received broadcast link maintenance signaling RMAINT3 issues registration signaling;
s7: after receiving the registration signaling sent by the unregistered base station, the node base station of the final stage transmits the registration signaling to the main node base station, and the main node base station selects a base station with the best uplink and downlink signal quality or the closest geographical position to the node base station of the final stage from the registered base stations after waiting for a period of time to serve as the next-stage node base station of the final stage;
the master node base station judges whether the next-stage node base station is an end node or not, if the next-stage node base station is the end node, the next-stage node base station is used as a first end node base station, then the master node base station judges whether other base stations except the first end node base station exist in the current base station registration or not, if not, the ad hoc network is ended, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the last-stage node base station is selected from the base stations and used as a second end node base station, and the ad hoc network is ended; if the next-stage node base station is not the end node, the next-stage node base station is treated as a new final-stage node base station, and then it goes to step S5.
2. The method for wireless ad hoc network of a mobile station according to claim 1, wherein the step S3 further comprises the steps of: the master node base station judges whether a final node base station in the forward direction and/or the reverse direction is an end node in the direction, if so, the final node base station is taken as a first end node base station in the direction, then, the master node base station judges whether other base stations except the first end node base station exist in the base station registration in the direction, if not, the ad hoc network is ended, if so, a base station with the best uplink and downlink signal quality or the closest geographical position to the master node base station is selected from the base stations and taken as a second end node base station in the direction, and the ad hoc network is ended; if not, step S4 is executed next.
3. The mobile station wireless ad hoc network method of claim 1, wherein said broadcast link maintenance signaling RMAINT1 comprises the following information: information indicating that the node itself is a master node, a time slot number used by the node itself, and an access direction of a subordinate node base station which invites unregistered subordinate base stations to register.
4. The mobile station wireless ad hoc network method according to claim 1, 2 or 3, wherein said broadcast link maintenance signaling RMAINT2 includes the following information: and informing the current ad hoc network access state, confirming the position of the terminal node base station, and prohibiting the terminal node base station from accessing the subordinate node base station.
5. The mobile station wireless ad hoc network method according to claim 1, 2 or 3, wherein said broadcast link maintenance signaling RMAINT3 includes the following information: information indicating that the node is not the master node, a time slot number used by the node, and an access direction of an unregistered subordinate base station.
6. A mobile station ad hoc network method as claimed in claim 1, 2 or 3, wherein when there are two end node base stations in a certain direction, the master node base station configures the two end node base stations in odd-even operation mode.
7. A mobile station wireless ad hoc network method according to claim 1, 2 or 3, wherein the master node base station initiates heartbeat signaling periodically or non-periodically, the indication in the heartbeat signaling is downlink, the subordinate base station transmits the heartbeat signaling, when transmitting to a node base station at a higher level than the terminal node base station, the node base station designates a certain terminal node base station to transmit heartbeat backhaul signaling, the designated terminal node base station transmits heartbeat backhaul signaling, the indication in the heartbeat backhaul signaling is uplink, if the certain node base station finds no heartbeat from the subordinate node base station, an uplink report is transmitted to the master node base station.
8. A mobile station wireless ad hoc network method as claimed in claim 1, 2, 3 or 4, wherein a link channel between node base stations uses a wireless channel of 25KHz frequency interval, a frame is divided into four time slots on the wireless channel of 25KHz frequency interval, the four time slots are time slot 1, time slot 2, time slot 3 and time slot 4 in turn, each node base station is allocated one of the four time slots for receiving/transmitting data;
the node base station in the ad hoc network allocates the use time slot according to the following rules: the time slots allocated to any three adjacent node base stations are different from each other, the time slots allocated to any four adjacent node base stations are different from each other, any one node base station is selected from the ad hoc network, and if the previous node base station of the node base station uses the time slot 1, the next node base station of the node base station uses the time slot 2; if the previous-stage base station of the node base station uses the time slot 2, the next-stage node base station of the node base station uses the time slot 1; if the previous node base station of the node base station uses the time slot 3, the next node base station of the node base station uses the time slot 4; if the node base station of the previous stage of the node base station uses the time slot 4, the node base station of the next stage of the node base station uses the time slot 3.
9. The method of claim 8, wherein the node base station locally forwards the radio channel using 12.5KHz frequency interval, and divides a frame into two time slots on the radio channel using 12.5KHz frequency interval.
10. The method of claim 1, 2 or 3, wherein the method for the master node base station to determine whether a node base station is an end node comprises: if the node base station of the node base station is not effectively registered within the set time EACK _ Timer, the node base station is judged to be the end node.
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