CN111404629B - Method for synchronous searching of TDMA wireless ad hoc network clock - Google Patents
Method for synchronous searching of TDMA wireless ad hoc network clock Download PDFInfo
- Publication number
- CN111404629B CN111404629B CN201910832697.1A CN201910832697A CN111404629B CN 111404629 B CN111404629 B CN 111404629B CN 201910832697 A CN201910832697 A CN 201910832697A CN 111404629 B CN111404629 B CN 111404629B
- Authority
- CN
- China
- Prior art keywords
- mobile station
- time slot
- time
- multiframe
- signaling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000001360 synchronised effect Effects 0.000 title abstract description 16
- 230000011664 signaling Effects 0.000 claims abstract description 160
- 230000005540 biological transmission Effects 0.000 claims description 26
- 230000008054 signal transmission Effects 0.000 claims description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0652—Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/70757—Synchronisation aspects with code phase acquisition with increased resolution, i.e. higher than half a chip
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
- H04J3/0688—Change of the master or reference, e.g. take-over or failure of the master
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
- H04J3/0691—Synchronisation in a TDM node
Abstract
The invention discloses a method for searching clock synchronization of a TDMA wireless ad hoc network. It comprises the following steps: after the mobile station is started, firstly receiving more than one superframe time at a wireless frequency point f1, then receiving more than one superframe time at a wireless frequency point f2, if no time mark signaling is received in the period, then determining that no main clock mobile station exists currently, then randomly selecting a multiframe in the next superframe, randomly selecting a time slot in the selected multiframe, sending the time mark signaling of the time slot by the wireless frequency point corresponding to the time slot, then sending the time mark signaling of the time slot by another wireless frequency point at the same time slot position of the next multiframe, and participating in election of the main clock mobile station if the mobile station receives the time mark signaling sent by other mobile stations in the current superframe period. The invention shortens the refreshing period of the synchronous clock and the emission duration of the synchronous clock.
Description
Technical Field
The invention relates to the technical field of TDMA wireless ad hoc networks, in particular to a method for searching TDMA wireless ad hoc network clock synchronization.
Background
In the area without network coverage, a group of mobile terminals uses a plurality of channels, and selects a transit mobile terminal as a transit node through competition to form a temporary service multi-hop network. Several transit mobile terminals can transmit the service (such as voice) to remote place to form a service area with larger coverage area.
The election of the relay mobile terminal of the ad hoc network is an important link of the network, and the mobile station adopting the TDMA technical specification also has the requirement of clock synchronization. The completion of the two links generally takes a long time and occupies a large resource.
In the DMR standard using the 2-slot TDMA technique, there is a method of using what is called a TDMA express mode, among which there is a clock synchronization method of a TDMA express network. However, the refresh period of the synchronous clock is long, and the requirement of fast networking required by the ad hoc network is not met.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for searching the synchronization of the clock of the TDMA wireless ad hoc network, which shortens the refreshing period of the synchronous clock and the transmission duration of the synchronous clock.
In order to solve the problems, the invention adopts the following technical scheme:
the invention discloses a method for searching a TDMA wireless ad hoc network clock synchronization, which comprises the following steps:
the mobile station used as the transit node can use PDT standard communication specification of two-time-slot TDMA and can work in a TDMA duplex mode;
the frequency for wireless ad hoc network work has two single frequency points, namely a wireless frequency point f1 and a wireless frequency point f2, two time slots of a TDMA frame on the wireless frequency point f1 are respectively recorded as a time slot C0 and a time slot C1, two time slots of a TDMA frame on the wireless frequency point f2 are respectively recorded as a time slot C2 and a time slot C3, the time slot C0, the time slot C1, the time slot C2 and the time slot C3 are sequentially arranged to form a multiframe, and 32 multiframes are arranged together to form a superframe;
the mobile station which can be used as a transfer node elects a main clock mobile station through an election method, wherein the election method comprises the following steps:
after the mobile station serving as a transit node is powered on, the mobile station receives more than one superframe at the wireless frequency point f1, then receives more than one superframe at the wireless frequency point f2, if no time stamp signaling is received during the above period, it is assumed that there is no master clock mobile station currently, then randomly selecting a multiframe in a subsequent superframe, randomly selecting a time slot in the selected multiframe, sending a time scale signaling of the time slot by using a wireless frequency point corresponding to the time slot, then sending a time scale signaling of the time slot by using another wireless frequency point at the same time slot position of the next multiframe, wherein the time scale signaling comprises the current time slot position, the next time scale signaling transmission time slot position information, the transmitting party authority level and the identification code, if the mobile station receives time mark signaling sent by other mobile stations in the current superframe period, the following operations are carried out:
judging whether other mobile stations have mobile stations with higher authority levels than the mobile stations, if so, quitting the election of the main clock mobile station, and stopping sending the time mark signaling;
if no mobile station with higher authority level than the self authority level exists, judging whether a mobile station with the same authority level as the self authority level exists, if so, judging whether a mobile station with a multiframe where the time mark signaling is sent is behind the multiframe where the time mark signaling is sent by the self, if so, quitting the election of the main clock mobile station, stopping sending the time mark signaling, otherwise, successfully electing, serving as the main clock mobile station, and continuously sending the time mark signaling.
In the scheme, a method for a mobile station, which can be used as a transit node, to randomly select a time slot in a selected multiframe, send a time mark signaling of the time slot at a wireless frequency point corresponding to the time slot, and then send the time mark signaling of the time slot at the same time slot position of the next multiframe at another wireless frequency point is as follows:
if the selected time slot is the time slot C0 or the time slot C1, the corresponding wireless frequency point is the wireless frequency point f1, the mobile station sends a time mark signaling of one time slot at the selected time slot by the wireless frequency point f1, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 2;
if the selected time slot is the time slot C2 or the time slot C3, the corresponding wireless frequency point is the wireless frequency point f2, the mobile station sends the time mark signaling of one time slot at the selected time slot by the wireless frequency point f2, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 1.
The time slot position of the time mark signaling sent by the mobile station which can be used as the transit node at each time is randomly selected, so that the time mark signaling can be prevented from colliding with the time mark signaling sent by other mobile stations which can be used as the transit node. After many cycles, only one mobile station will eventually transmit the timing mark signaling, which is the preferred master clock mobile station. The method shortens the refreshing period of the synchronous clock and the emission duration of the synchronous clock.
Preferably, each mobile station serving as a transit node is provided with a corresponding permission level value in advance, the permission level values are respectively 1, 2 and 3, the larger the value is, the higher the permission level is, 3 represents the highest permission level, and 1 represents the lowest permission level.
Preferably, 32 multiframes in the superframe are sequentially numbered as 0-31 in time sequence, and the multiframes randomly selected by the mobile station as the sending time scale signaling must satisfy the following conditions: the result of modulo operation of the multiframe sequence number and the mobile station permission level value is equal to the mobile station permission level value. The time sequences which can be selected by the mobile stations with the three authorities are distinguished, collision is avoided, and the selection time is shortened.
Preferably, the position of the time slot for transmitting the next time stamp signaling in the time stamp signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the time slot position for next time scale signaling transmission, and the same time slot position as that of the next subsequent multiframe is the time slot position for next time scale signaling transmission.
Preferably, after the master clock mobile station is selected, the one-stage relay mobile station is selected by the following method:
after receiving the time mark signaling sent by the master clock mobile station, the other mobile stations which can be used as the transit nodes, randomly selecting a multiframe from the time of receiving the time mark signaling sent by the main clock mobile station to the next time of receiving the time mark signaling sent by the main clock mobile station, wherein the selected multiframe must be different from the multiframe position of the time mark signaling sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe, sending a first-level transit time mark signaling of the time slot by a wireless frequency point corresponding to the time slot, and then sending a first-level transit time mark signaling of the time slot by another wireless frequency point at the same time slot position of the next multiframe, wherein the first-level transit time mark signaling comprises the current time slot position, the next first-level transit time mark signaling transmission time slot position information, the transmitting party authority level, the identification code, the main clock mobile station identification code and the received signal quality information;
after receiving the first-stage transfer time mark signaling, the main clock mobile station selects the first-stage transfer mobile station and sends a designated signaling to the selected first-stage transfer mobile station.
The position of the next one-level transit time mark signaling transmission time slot in the one-level transit time mark signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the same as that of the next multiframe, namely the next-stage transit time mark signaling transmission time slot position.
The multiframe randomly selected by the mobile station as the signaling for sending the primary transit time mark must satisfy the following conditions: the result of modulo operation of the multiframe sequence number and the mobile station authority level value is equal to the mobile station authority level value and avoids the multiframe position of the main clock mobile station sending the time mark signaling.
Preferably, the master mobile station preferentially selects a mobile station having a higher authority level as the primary relay mobile station, and preferentially selects a mobile station located within the optimal relay range as the primary relay mobile station when the authority levels are the same. The mobile stations within the optimum relay range are the mobile stations with better received signal quality and a longer distance from the master clock mobile station.
Preferably, the designated signaling sent by the master mobile station to the primary relay mobile station further includes information on whether to select the secondary relay mobile station, and if the primary relay mobile station receives the information on the selected secondary relay mobile station, the secondary relay mobile station is selected, and the method includes:
other mobile stations which can be used as transfer nodes, after receiving a first transfer time mark signal sent by a first transfer mobile station, randomly selecting a multiframe from the time of receiving the first transfer time mark signal sent by the first transfer mobile station to the next time of receiving the first transfer time mark signal sent by the first transfer mobile station, wherein the selected multiframe is different from the multiframe position of the time mark signal sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe, sending a second transfer time mark signal of the time slot by a wireless frequency point corresponding to the time slot, and then sending a second transfer time mark signal of the time slot by another wireless frequency point at the same time slot position of the next multiframe, wherein the second transfer time mark signal comprises the current time slot position, the next second transfer time mark signal transmission time slot position information, the transmitting party authority level, the self identity code, The first-level transfer mobile station identity identification code and the received signal quality information;
and after the first-level transfer mobile station receives the second-level transfer time mark signaling, selecting the second-level transfer mobile station and sending the designated signaling to the selected second-level transfer mobile station.
The position of the next secondary transit time mark signaling transmission time slot in the secondary transit time mark signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the time slot position of the next secondary transit time mark signaling transmission, and the time slot position is the same as the time slot position of the next multiframe.
The multiframe randomly selected by the mobile station as the signaling for sending the secondary transit time mark must satisfy the following conditions: the result of modulo operation of the multiframe sequence number and the mobile station authority level value is equal to the mobile station authority level value and avoids the multiframe position of the time mark signaling sent by the main clock mobile station.
Preferably, after the normal mobile station is powered on, the normal mobile station receives more than one superframe at the wireless frequency point f1, then receives more than one superframe at the wireless frequency point f2, and performs code scanning reception according to the superframe timed by the mobile station of the main clock after receiving the time scale signaling, namely performs multiframe cyclic scanning reception according to the time slot C0, the time slot C1, the time slot C2 and the time slot C3.
Preferably, when the normal mobile station needs to transmit, the normal mobile station transmits in the channel of the time slot C0 according to the timing of the main clock mobile station, and the normal mobile station which does not receive the timing information of the main clock mobile station prohibits the transmission.
The invention has the beneficial effects that: the refresh period of the synchronous clock and the transmission duration of the synchronous clock are shortened, and the transfer mobile station is elected at the same time when the synchronous clock is established.
Drawings
Fig. 1 is a schematic diagram of the structure of a superframe of the embodiment.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the method for searching the clock synchronization of the TDMA wireless ad hoc network comprises the following steps:
the mobile station used as the transit node can use PDT standard communication specification of two-time-slot TDMA and can work in a TDMA duplex mode;
the frequency for the wireless ad hoc network work has two single frequency points, namely a wireless frequency point f1 and a wireless frequency point f2, two time slots of a TDMA frame on the wireless frequency point f1 are respectively marked as a time slot C0 and a time slot C1, two time slots of a TDMA frame on the wireless frequency point f2 are respectively marked as a time slot C2 and a time slot C3, the time slot C0, the time slot C1, the time slot C2 and the time slot C3 are sequentially arranged to form a multiframe, 32 multiframes are arranged together to form a superframe, and the 32 multiframes in the superframe are sequentially numbered as 0-31 according to the time sequence;
each mobile station used as a transit node is provided with a corresponding authority level numerical value in advance, the authority level numerical values are respectively 1, 2 and 3, the larger the numerical value is, the higher the authority level represented by the numerical value is, the 3 represents the highest authority level, and the 1 represents the lowest authority level;
the main clock mobile station can be selected by the mobile station as a transfer node through an election method, and the election method comprises the following steps:
after a mobile station which can be used as a transfer node is started, firstly, a wireless frequency point f1 receives more than one superframe time, then, a wireless frequency point f2 receives more than one superframe time, if no time mark signaling or synchronous word is received in the period, the mobile station is considered to have no main clock at present, then, a multiframe is randomly selected in the next superframe (the condition that the result of modulo operation of a multiframe serial number and a mobile station authority level value is equal to the mobile station authority level value must be met), a time slot is randomly selected in the selected multiframe, a wireless frequency point corresponding to the time slot sends a time mark signaling of the time slot, and then, the time mark signaling sends the time mark signaling of the time slot at the same time slot position of the next multiframe by another wireless frequency point, wherein the time mark signaling comprises the current time slot position, the next time mark signaling transmission time slot position information, The authority level and the identification code of the transmitting party, if the mobile station receives time mark signaling sent by other mobile stations in the current superframe period, the following operations are carried out:
judging whether other mobile stations have mobile stations with higher authority levels than the mobile stations, if so, quitting the election of the main clock mobile station, and stopping sending the time mark signaling;
if no mobile station with higher authority level than the self authority level exists, judging whether a mobile station with the same authority level as the self authority level exists, if so, judging whether a mobile station with a multiframe where the time mark signaling is sent is behind the multiframe where the time mark signaling is sent by the self, if so, quitting the election of the main clock mobile station, stopping sending the time mark signaling, otherwise, successfully electing, serving as the main clock mobile station, and continuously sending the time mark signaling.
The position of the time slot for transmitting the next time of the time scale signaling in the time scale signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the time slot position for next time scale signaling transmission, and the same time slot position as that of the next subsequent multiframe is the time slot position for next time scale signaling transmission.
After the main clock mobile station is selected, a first-level transfer mobile station is selected, and the method comprises the following steps:
other mobile stations which can be used as transit nodes, after receiving the time mark signaling sent by the main clock mobile station, randomly selecting a multiframe from the time when the time mark signaling sent by the main clock mobile station is received next time (the conditions are satisfied, the result of modulo operation of the multiframe serial number and the mobile station authority level value is equal to the mobile station authority level value and avoids the multiframe position of the time mark signaling sent by the main clock mobile station), the selected multiframe must be different from the multiframe position of the time mark signaling sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe and sending the first-level transit time mark signaling of the time slot by the wireless frequency point corresponding to the time slot, and then sending the first-level transit time mark signaling of the time slot by another wireless at the same time slot position of the next multiframe, wherein the first-level transit time mark signaling comprises the current time slot position, The next one-level transit time mark signaling transmits time slot position information, transmitting party authority level, identification code, main clock mobile station identification code and received signal quality information;
after receiving the first-stage transfer time mark signaling, the main clock mobile station selects the first-stage transfer mobile station and sends a designated signaling to the selected first-stage transfer mobile station.
The position of the next one-level transit time mark signaling transmission time slot in the one-level transit time mark signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the same as that of the next multiframe, namely the next-stage transit time mark signaling transmission time slot position.
The master clock mobile station preferentially selects the mobile station with high authority level as the first-level transfer mobile station, and preferentially selects the mobile station in the optimal transfer range as the first-level transfer mobile station under the condition of the same authority level. The mobile stations within the optimum relay range are the mobile stations with better received signal quality and a longer distance from the master clock mobile station. For example: selecting the mobile station with the received signal strength greater than the preset lower limit value from the mobile stations with the highest authority level, and then selecting the mobile station with the minimum received signal strength from the mobile stations, wherein the mobile station is a first-level relay mobile station.
In the scheme, a method for a mobile station, which can be used as a transit node, to randomly select a time slot in a selected multiframe, send a time mark signaling of the time slot at a wireless frequency point corresponding to the time slot, and then send the time mark signaling of the time slot at the same time slot position of the next multiframe at another wireless frequency point is as follows:
if the selected time slot is the time slot C0 or the time slot C1, the corresponding wireless frequency point is the wireless frequency point f1, the mobile station sends a time mark signaling of one time slot at the selected time slot by the wireless frequency point f1, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 2;
if the selected time slot is the time slot C2 or the time slot C3, the corresponding wireless frequency point is the wireless frequency point f2, the mobile station sends the time mark signaling of one time slot at the selected time slot by the wireless frequency point f2, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 1.
For example: as shown in fig. 1, the mobile station transmits a time scale signaling beacon of one time slot at a wireless frequency point f1 in a time slot C1 of the multiframe with sequence number 1, and then transmits a time scale signaling beacon of one time slot at a wireless frequency point f2 in a time slot C1 of the multiframe with sequence number 2.
The method for a mobile station, which can be used as a relay node, to randomly select a time slot in a selected multiframe, send a first-level relay time mark signaling of the time slot at a wireless frequency point corresponding to the time slot, and then send the first-level relay time mark signaling of the time slot at the same time slot position of the next multiframe at another wireless frequency point is as follows:
if the selected time slot is the time slot C0 or the time slot C1, the corresponding wireless frequency point is the wireless frequency point f1, the mobile station sends a first-level transit time mark signaling of one time slot at the selected time slot by the wireless frequency point f1, and then sends a first-level transit time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 2;
if the selected time slot is the time slot C2 or the time slot C3, the corresponding wireless frequency point is the wireless frequency point f2, the mobile station sends a primary transit time mark signaling of one time slot at the selected time slot by the wireless frequency point f2, and then sends the primary transit time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 1.
The multiframes randomly chosen by the mobile station as the signaling of the transmission time scale must satisfy: the result of modulo operation of the multiframe sequence number and the mobile station permission level value is equal to the mobile station permission level value. The time sequences which can be selected by the mobile stations with the three authorities are distinguished, collision is avoided, and the selection time is shortened.
The time slot position of the time mark signaling sent by the mobile station which can be used as the transit node at each time is randomly selected, so that the time mark signaling can be prevented from colliding with the time mark signaling sent by other mobile stations which can be used as the transit node. After many cycles, only one mobile station will eventually transmit the timing mark signaling, which is the preferred master clock mobile station.
Other mobile stations either transmit transit time stamp signaling. The "master clock" election may have 2 or more split master clock mobiles, but there must be other transit mobiles between the 2 split master clock mobiles that can all receive the 2 master clocks, otherwise 2 independent nets.
The method shortens the refreshing period of the synchronous clock and the emission duration of the synchronous clock, and the transfer mobile station is elected at the same time when the synchronous clock is established.
The appointed signaling sent by the main clock mobile station to the first-level transfer mobile station also contains the information whether to select the second-level transfer mobile station, if the first-level transfer mobile station receives the information of selecting the second-level transfer mobile station, the second-level transfer mobile station is selected, and the method comprises the following steps:
other mobile stations which can be used as a transfer node, after receiving a first-stage transfer time mark signaling sent by a first-stage transfer mobile station, randomly selecting a multiframe from the time when the first-stage transfer time mark signaling sent by the first-stage transfer mobile station is received next time to the time when the first-stage transfer time mark signaling sent by the first-stage transfer mobile station is received (the following conditions must be satisfied, namely the result of modulo operation of a multiframe serial number and a mobile station authority level value is equal to the mobile station authority level value and the multiframe position of the time mark signaling sent by a main clock mobile station is avoided), wherein the selected multiframe must be different from the multiframe position of the time mark signaling sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe and sending a second-stage transfer time mark signaling of the time slot by a wireless frequency point corresponding to the time slot, and then sending a second-stage transfer time mark signaling of the time slot by another wireless frequency point at the same time slot position of the next multiframe, the second-level transit time mark signaling comprises a current time slot position, next second-level transit time mark signaling transmission time slot position information, a transmitting party authority level, a self identity identification code, a first-level transit mobile station identity identification code and received signal quality information;
and after the first-level transfer mobile station receives the second-level transfer time mark signaling, selecting the second-level transfer mobile station and sending the designated signaling to the selected second-level transfer mobile station.
The position of the next secondary transit time mark signaling transmission time slot in the secondary transit time mark signaling is determined by the following method: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the time slot position of the next secondary transit time mark signaling transmission, and the time slot position is the same as the time slot position of the next multiframe.
The method for the mobile station, which can be used as a relay node, to randomly select a time slot in a selected multiframe, send the secondary relay time mark signaling of the time slot at the wireless frequency point corresponding to the time slot, and then send the secondary relay time mark signaling of the time slot at the same time slot position of the next multiframe at another wireless frequency point is as follows:
if the selected time slot is the time slot C0 or the time slot C1, the corresponding wireless frequency point is the wireless frequency point f1, the mobile station sends a secondary transfer time mark signaling of one time slot at the selected time slot by the wireless frequency point f1, and then sends the secondary transfer time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 2;
if the selected time slot is the time slot C2 or the time slot C3, the corresponding wireless frequency point is the wireless frequency point f2, the mobile station sends a secondary transfer time mark signaling of one time slot at the selected time slot by the wireless frequency point f2, and then sends the secondary transfer time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 1.
After the ordinary mobile station is started, firstly, the ordinary mobile station receives more than one superframe time at a wireless frequency point f1, then, the ordinary mobile station receives more than one superframe time at a wireless frequency point f2, and after time mark signaling is received, code scanning reception is carried out according to the superframe timed by the mobile station of a main clock, namely, multiframe cyclic scanning reception is carried out according to a time slot C0, a time slot C1, a time slot C2 and a time slot C3.
When the ordinary mobile station needs to transmit, it transmits on the channel of time slot C0 according to the timing of the main clock mobile station, and the ordinary mobile station which does not receive the timing information of the main clock mobile station prohibits transmitting.
Claims (9)
1. A method for searching the clock synchronization of a TDMA wireless ad hoc network is characterized by comprising the following steps:
the mobile station used as the transit node can use PDT standard communication specification of two-time-slot TDMA and can work in a TDMA duplex mode;
the frequency for wireless ad hoc network work has two single frequency points, namely a wireless frequency point f1 and a wireless frequency point f2, two time slots of a TDMA frame on the wireless frequency point f1 are respectively recorded as a time slot C0 and a time slot C1, two time slots of a TDMA frame on the wireless frequency point f2 are respectively recorded as a time slot C2 and a time slot C3, the time slot C0, the time slot C1, the time slot C2 and the time slot C3 are sequentially arranged to form a multiframe, and 32 multiframes are arranged together to form a superframe;
the mobile station which can be used as a transfer node elects a main clock mobile station through an election method, wherein the election method comprises the following steps:
after the mobile station serving as a transit node is powered on, the mobile station receives more than one superframe at the wireless frequency point f1, then receives more than one superframe at the wireless frequency point f2, if no time stamp signaling is received during the above period, it is assumed that there is no master clock mobile station currently, then randomly selecting a multiframe in a subsequent superframe, randomly selecting a time slot in the selected multiframe, sending a time scale signaling of the time slot by using a wireless frequency point corresponding to the time slot, then sending a time scale signaling of the time slot by using another wireless frequency point at the same time slot position of the next multiframe, wherein the time scale signaling comprises the current time slot position, the next time scale signaling transmission time slot position information, the transmitting party authority level and the identification code, if the mobile station receives the time mark signaling sent by other mobile stations in the current superframe period, the following operations are carried out:
judging whether other mobile stations have mobile stations with higher authority levels than the mobile stations, if so, quitting the election of the main clock mobile station, and stopping sending the time mark signaling;
if no mobile station with the authority level higher than the authority level of the mobile station, judging whether a mobile station with the authority level same as the authority level of the mobile station exists, if so, judging whether a mobile station with a multiframe where the time mark signaling is sent is behind the multiframe where the time mark signaling is sent by the mobile station, if so, quitting the election of the main clock mobile station, stopping sending the time mark signaling, otherwise, successfully electing the main clock mobile station, and continuously sending the time mark signaling;
the method for a mobile station, which can be used as a relay node, to randomly select a time slot in a selected multiframe and send a time mark signaling of the time slot at a wireless frequency point corresponding to the time slot, and then send the time mark signaling of the time slot at the same time slot position of the next multiframe at another wireless frequency point is as follows:
if the selected time slot is the time slot C0 or the time slot C1, the corresponding wireless frequency point is the wireless frequency point f1, the mobile station sends a time mark signaling of one time slot at the selected time slot by the wireless frequency point f1, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 2;
if the selected time slot is the time slot C2 or the time slot C3, the corresponding wireless frequency point is the wireless frequency point f2, the mobile station sends the time mark signaling of one time slot at the selected time slot by the wireless frequency point f2, and then sends the time mark signaling of one time slot at the same time slot position of the next multiframe by the wireless frequency point f 1.
2. The method for searching for the clock synchronization of the TDMA wireless ad hoc network according to claim 1, wherein each mobile station serving as a transit node is pre-configured with a corresponding permission level value, wherein the permission level values are 1, 2 and 3, respectively, the larger the value is, the higher the permission level is, the 3 represents the highest permission level, and the 1 represents the lowest permission level.
3. A method for searching for the synchronization of the clock in a TDMA wireless ad hoc network as claimed in claim 2, wherein 32 multiframes in said one superframe are sequentially numbered 0-31 in time sequence, and the multiframe randomly selected by the mobile station as the transmission timing signaling must satisfy the following condition: the result of modulo operation of the multiframe sequence number and the mobile station permission level value is equal to the mobile station permission level value.
4. A method for clock synchronization searching in a TDMA wireless ad hoc network as claimed in claim 1, 2 or 3, wherein the position of the next time scale signalling transmission slot in said time scale signalling is determined by: randomly selecting a multiframe in a subsequent superframe, and randomly selecting a time slot in the selected multiframe, wherein the time slot position is the time slot position for next time scale signaling transmission, and the time slot position is the same as the time slot position of the next subsequent multiframe.
5. A method for TDMA wireless ad hoc network clock synchronization searching according to claim 1, 2, 3 or 4, wherein after a master clock mobile station is elected, a first class transit mobile station is selected by:
after receiving the time mark signaling sent by the master clock mobile station, the other mobile stations which can be used as the transit nodes, randomly selecting a multiframe from the time of receiving the time mark signaling sent by the main clock mobile station to the next time of receiving the time mark signaling sent by the main clock mobile station, wherein the selected multiframe must be different from the multiframe position of the time mark signaling sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe, sending a first-level transit time mark signaling of the time slot by a wireless frequency point corresponding to the time slot, and then sending a first-level transit time mark signaling of the time slot by another wireless frequency point at the same time slot position of the next multiframe, wherein the first-level transit time mark signaling comprises the current time slot position, the next first-level transit time mark signaling transmission time slot position information, the transmitting party authority level, the identification code, the main clock mobile station identification code and the received signal quality information;
after receiving the first-stage transfer time mark signaling, the main clock mobile station selects the first-stage transfer mobile station and sends a designated signaling to the selected first-stage transfer mobile station.
6. The method according to claim 5, wherein the master clock mobile station preferentially selects the mobile station with higher authority level as the first-class relay mobile station, and preferentially selects the mobile station within the optimal relay range as the first-class relay mobile station if the authority levels are the same.
7. The method according to claim 5, wherein the specific signaling sent from the master mobile station to the primary relay mobile station further includes information on whether to select the secondary relay mobile station, and if the primary relay mobile station receives the information on the selected secondary relay mobile station, the secondary relay mobile station is selected, and the method comprises:
other mobile stations which can be used as transfer nodes, after receiving a first transfer time mark signal sent by a first transfer mobile station, randomly selecting a multiframe from the time of receiving the first transfer time mark signal sent by the first transfer mobile station to the next time of receiving the first transfer time mark signal sent by the first transfer mobile station, wherein the selected multiframe is different from the multiframe position of the time mark signal sent by the main clock mobile station, randomly selecting a time slot in the selected multiframe, sending a second transfer time mark signal of the time slot by a wireless frequency point corresponding to the time slot, and then sending a second transfer time mark signal of the time slot by another wireless frequency point at the same time slot position of the next multiframe, wherein the second transfer time mark signal comprises the current time slot position, the next second transfer time mark signal transmission time slot position information, the transmitting party authority level, the self identity code, The first-level transfer mobile station identity identification code and the received signal quality information;
and after the first-level transfer mobile station receives the second-level transfer time mark signaling, selecting the second-level transfer mobile station and sending the designated signaling to the selected second-level transfer mobile station.
8. The method according to claim 1, wherein after the ordinary mobile station is powered on, the ordinary mobile station receives more than one superframe at the wireless frequency point f1, then receives more than one superframe at the wireless frequency point f2, and after receiving the timing mark signaling, performs code scanning reception according to the superframe timed by the mobile station of the main clock, that is, performs scanning reception according to the timeslot C0, timeslot C1, timeslot C2, and timeslot C3 multiframe cycle.
9. The method of claim 8, wherein when the ordinary mobile station needs to transmit, it transmits uplink in the time slot C0 according to the timing of the primary clock mobile station, and the ordinary mobile station that does not receive the timing information of the primary clock mobile station prohibits transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910832697.1A CN111404629B (en) | 2019-09-04 | 2019-09-04 | Method for synchronous searching of TDMA wireless ad hoc network clock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910832697.1A CN111404629B (en) | 2019-09-04 | 2019-09-04 | Method for synchronous searching of TDMA wireless ad hoc network clock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111404629A CN111404629A (en) | 2020-07-10 |
| CN111404629B true CN111404629B (en) | 2022-08-05 |
Family
ID=71430249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910832697.1A Active CN111404629B (en) | 2019-09-04 | 2019-09-04 | Method for synchronous searching of TDMA wireless ad hoc network clock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111404629B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114286422B (en) * | 2020-09-27 | 2023-12-19 | 四川海格恒通专网科技有限公司 | Method for discovering and combining different groups of TDMA wireless ad hoc network |
| CN114286350A (en) * | 2020-09-27 | 2022-04-05 | 杭州承联通信技术有限公司 | TDMA wireless ad hoc network branching networking method |
| CN114143726B (en) * | 2021-12-01 | 2023-05-12 | 东方通信股份有限公司 | Method for realizing PDT direct forwarding networking |
| CN116234056B (en) * | 2023-05-08 | 2023-08-08 | 南京邮电大学 | MAC protocol design method of wireless meter reading system based on LoRaWAN |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931500A (en) * | 2010-08-19 | 2010-12-29 | 优能通信科技（杭州）有限公司 | Method for transmitting backward control signaling by using control channel in DMR system |
| CN101977385A (en) * | 2010-10-27 | 2011-02-16 | 南京航空航天大学 | DSAM (Dynamic Slot-time Allocation Method) of scale-extensible single-jump ad hoc network supporting QoS (Quality of Service) |
| CN102883426A (en) * | 2012-10-11 | 2013-01-16 | 天津大学 | Long-distance wireless mesh network media access control (MAC) protocol based on satellite time service |
| CN106209289A (en) * | 2016-06-29 | 2016-12-07 | 西安空间无线电技术研究所 | A kind of moonlet self-organizing network method for synchronizing time |
| CN107257584A (en) * | 2017-06-15 | 2017-10-17 | 重庆邮电大学 | The high slot efficiency cut-in method of Terahertz Wireless Personal Network based on implicit TDMA |
| CN108055115A (en) * | 2018-01-08 | 2018-05-18 | 西安电子科技大学 | Time slot group scheduling method in Distributed T DMA agreements |
| CN109412736A (en) * | 2018-11-16 | 2019-03-01 | 北京韦加航通科技有限责任公司 | A kind of narrowband ad hoc network time synchronization method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2387072B (en) * | 2002-03-28 | 2004-09-22 | Motorola Inc | Mobile communication stations, methods and systems |
-
2019
- 2019-09-04 CN CN201910832697.1A patent/CN111404629B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931500A (en) * | 2010-08-19 | 2010-12-29 | 优能通信科技（杭州）有限公司 | Method for transmitting backward control signaling by using control channel in DMR system |
| CN101977385A (en) * | 2010-10-27 | 2011-02-16 | 南京航空航天大学 | DSAM (Dynamic Slot-time Allocation Method) of scale-extensible single-jump ad hoc network supporting QoS (Quality of Service) |
| CN102883426A (en) * | 2012-10-11 | 2013-01-16 | 天津大学 | Long-distance wireless mesh network media access control (MAC) protocol based on satellite time service |
| CN106209289A (en) * | 2016-06-29 | 2016-12-07 | 西安空间无线电技术研究所 | A kind of moonlet self-organizing network method for synchronizing time |
| CN107257584A (en) * | 2017-06-15 | 2017-10-17 | 重庆邮电大学 | The high slot efficiency cut-in method of Terahertz Wireless Personal Network based on implicit TDMA |
| CN108055115A (en) * | 2018-01-08 | 2018-05-18 | 西安电子科技大学 | Time slot group scheduling method in Distributed T DMA agreements |
| CN109412736A (en) * | 2018-11-16 | 2019-03-01 | 北京韦加航通科技有限责任公司 | A kind of narrowband ad hoc network time synchronization method |
Non-Patent Citations (3)
| Title |
|---|
| 基于TD-SCDMA集群直通模式的时钟同步;苏燕等;《微计算机信息》;20080525(第15期);第2-3节 * |
| 基于生存周期的自组网同步研究;金瑞等;《电子测量技术》;20170615(第06期);全文 * |
| 无线传感器分簇网络实验系统设计;杨卫军等;《实验科学与技术》;20130828(第04期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111404629A (en) | 2020-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111404629B (en) | Method for synchronous searching of TDMA wireless ad hoc network clock | |
| US9860860B2 (en) | Synchronization signals for device-to-device communcations | |
| CN101689919B (en) | Method for implementing digital mobile radio private network communication, digital mobile radio private network communication terminal, relay station and system | |
| KR101208808B1 (en) | A method for generating the group id of the random access response message, and a random access method | |
| CN100423607C (en) | Wireless communication system and device | |
| CN106664684B (en) | Method and apparatus for deciding D2D data resources for D2D communication | |
| US8913548B2 (en) | Method of control information for supporting relay system | |
| CN101588629B (en) | The determination method and apparatus of DL synchronization component carrier wave in a kind of carrier aggregation system | |
| CN110249575A (en) | More subframe discoveries reference signaling (DRS) measure timing configured (DMTC) window | |
| CN108781421A (en) | Operation mode on shared communication medium is coordinated | |
| CN108496407A (en) | Exempting to permit to indicate other PBCH symbols in the environment of small cell | |
| CN1957562B (en) | Method and radio station for signal transmission in a radio communication system | |
| CN109618415A (en) | A kind of D2D communication means and equipment | |
| US8861485B2 (en) | Self-organizing communications network and method for the operation thereof | |
| CN104854947A (en) | Base station, user equipment and methods for random access | |
| CN107710840B (en) | Method and apparatus for transmitting device-to-device (D2D) synchronization signals | |
| CN111149414A (en) | User equipment and base station participating in preferential random access | |
| TW201921984A (en) | CSI-RS scrambling of subframes in a multi-subframe DRS | |
| GB2576202A (en) | Method and apparatus for random access in an integrated access and backhaul communication system | |
| CN109156016A (en) | Random access procedure and burst transfer in radio frequency system | |
| JP5391419B2 (en) | Wireless device and wireless communication system including the same | |
| KR20150017960A (en) | Method and apparatus for synchronizing frame number among device-to-device communication enabled user equipment | |
| CN102804846A (en) | HARQ adaptation for acquisition of neighbor cell system information | |
| KR101788196B1 (en) | Bio-inspired distributed wireless resource allocation method for the Ad-hoc network environment | |
| JP4031868B2 (en) | COMMUNICATION DEVICE, BASE STATION, AND COMMUNICATION METHOD |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240105 Address after: 621000 No.8 Mintai Road, Youxian District, Mianyang City, Sichuan Province Patentee after: SICHUAN HAIGE HENGTONG PRIVATE NETWORK TECHNOLOGY CO.,LTD. Address before: 310053 5th floor, building 8, high tech software park, No. 1 Weiye Road, Binjiang District, Hangzhou, Zhejiang Province Patentee before: HANGZHOU ACTEC COMMUNICATION TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right |