CN104125634A - Terminal ad hoc network synchronization method - Google Patents
Terminal ad hoc network synchronization method Download PDFInfo
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- CN104125634A CN104125634A CN201310146587.2A CN201310146587A CN104125634A CN 104125634 A CN104125634 A CN 104125634A CN 201310146587 A CN201310146587 A CN 201310146587A CN 104125634 A CN104125634 A CN 104125634A
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Abstract
The invention provides a terminal ad hoc network synchronization method, in which the synchronization is performed by use of a GPS or Beidou system, or by way of synchronizing time marks transmitted by relevant areas, or by way of synchronizing signals transmitted by terminals, or by any combination of the above.
Description
Technical field
The present invention relates to radio communication, relate in particular to a kind of synchronous method of terminal MANET.
Background technology
Wireless Mesh technology taking 802.X.X as representative is current study hotspot and emphasis, this class Wireless Mesh technology is got up for Internet wireless access and application development, and its typical case application is mainly manifested in that specific region, city, complicated block, buildings are inside and outside, in Office Area, family room and the scene such as individual periphery.In this applied environment, each node often moves for fixing or low speed, and the variation of network topology structure is slow, and business is taking Internet access as main, and the enforcement business such as voice are also that mode taking VoiP is as main.It is synchronously the key of self-organized network communication.
Summary of the invention
The present invention proposes a kind of synchronous method of terminal MANET, comprising: adopt gps system or dipper system or adopt the mode of the synchronous time mark that relevant range sends or utilize the mode of the synchronizing signal that terminal sends, or the mode of its combination in any is carried out synchronously.
Preferably, receiving in the environment of gps system or dipper system, adopt gps system or dipper system to carry out synchronously; Not receiving in the environment of gps system or dipper system, adopt the mode of relevant range transmission synchronous time mark to carry out synchronously; Can not receive gps system or dipper system, relevant range does not have in the environment of synchronous time mark yet, and the synchronizing signal of utilizing terminal to send is carried out synchronously.
Preferably, adopt GPS or dipper system to carry out in synchronous situation, terminal obtains positional information and system absolute time benchmark by GPS or dipper system.
Preferably, terminal is with the Big Dipper module with emission mode, and under the environment without other transmission means, terminal utilizes the SMS of the Big Dipper to communicate.
Preferably, the synchronizing signal of utilizing terminal to send synchronously specifically comprises: described terminal is before transmission information, if do not receive the synchronizing signal of other-end, press local clock transmitted signal, the signal that this terminal sends is as the seed synchronizing signal of self-organization network, and other-end is synchronizeed with this seed synchronizing signal.
Embodiment
Taking McWiLL terminal as example, specific embodiment of the invention is described in further detail below.
Ad hoc network terminal can realize by changing the mode of software two kinds of mode of operations of terminal, i.e. node in terminal and MANET under McWiLL.The replacing of mode of operation can be manual mode, can be also automated manner.The terminal of MANET can be by the form realization of radio network gateway and interconnecting of McWiLL network.Therefore terminal MANET can regard that McWiLL network extends in the one of network edge as.
Synchronously can adopt three kinds of modes, the first adopts global positioning system or dipper system (GPS/BD) to carry out synchronously, receiving in the environment of GPS/BD, can obtain the absolute time benchmark of positional information and the system of terminal by GPS/BD.From utilizing the pulse per second (PPS) that GPS/BD obtains can carry out synchronously, utilize the positional information of GPS/BD acquisition simultaneously, can present cooperation personnel's positional information.As fruit product, selection in the time designing has the DB module of emission mode, can also utilize the SMS of BD, carries out short message communication under the environment without other transmission means; Its two mode that adopts relevant range to send synchronous time mark realizes the demarcation of terminal 10mS time reference; The third mode is to utilize the synchronizing signal sending, and terminal is carried out the locking of time reference each other.
Terminal is before transmission information, if do not receive the synchronizing signal of other-end, carry out the transmission of signal by own local clock, the synchronizing signal that this terminal sends is exactly the seed clock in self-organization network, the interior other-end of net that receives synchronizing signal is synchronizeed with this seed synchronizing signal, can not directly receive the terminal of this seed synchronizing signal, receive the synchronizing signal of other-end forwarding and synchronize with the signal of receiving.
No matter be the radio frequency bandwidth of 1MHz or the radio frequency bandwidth of 5MHz, synchronous head all sends by the bandwidth of 1MHz, adopts the m sequence that length is 63, and chip duration is 1uS, takies altogether the time of 63uS.The synchronous head of different time-gap adopts different m sequences, in search synchronous head, also can know the sequence number of time slot used like this.In the m sequence of 63, mould two two 31 the long m sequences that superpose, 63uS time when synchronous in order to utilize and power transmit the information of 2bit, representative respectively: 00 high-priority service is seized, receive this mark, all terminals time-outs send 2 frames on the time slot having taken, and wait for after high-priority service accesses and again accessing, the rear continuity business of access.01,10,11 represent frequency pattern sequence number.The do not superpose information of this 2bit is normal synchronous head.
For the system of 5MHz bandwidth, the transmitting power of synchronous head is than the high 7dB of the power of Traffic Channel, 63 long m sequence despreadings gain up to 18dB, the link budget of synchronous head, than the link budget of Traffic Channel high 25dB in the time adopting 5MHz radio frequency bandwidth, is wanted high 18dB in the time adopting 1MHz radio frequency bandwidth theoretically.Adopt synchronous head to carry out link budget measurement, in the time adopting 5MHz radio frequency bandwidth, can measure isolation more than identical services time slot 20dB, in the time adopting 1M radio frequency bandwidth, can measure isolation more than 15dB.There is the measurement result of identical services time slot isolation, just can multiplexing time slot.Tentatively think and adopt the modulation scheme of OFDM, for reaching the ability of transmission 16QAM, need the isolation of 20db, and GMSK needs the isolation of 15dB.
While not having signal demand to send in network, terminal is in sleep state, now only there is the LNA work of front end, if there is the transmitted signal of other-end to arrive, the signal of LNA output can be higher than certain threshold value, utilize this status signal, wake terminal up and receive and complete other relevant operations.Do not wake up if exceed regular hour terminal, terminal can be waken up according to the timing of oneself, and the interval of timing can arrange according to different needs.Terminal, after being waken up, receive the signal of GPS/BD, carries out position renewal and clock alignment.
Need the terminal of access, in receiving 10mS complete signal, just know which time slot is idle.Send access frame at the free timeslot place of ensuing next 10mS frame, access frame is in the random site (angle that this random site is simplified from Project Realization, can define 8 fixing time points, while realization, only put and carry out random probing in these 8 regular times) the upper collision detection signal that sends, collision detection signal duration 64uS, adopt m sequence mould two to add the mode of Walsh code, design 64 long, 8 × 8 Walsh carries the user totem information of 1 byte.Recipient is receiving after synchronizing signal, detectable signal like this, just knows this time slot of what CU of what time slot, for dynamic routing provides route required relevant information.User's identification information takies 7bit, if by the extreme higher position 1 in 1 byte, in the scene for hidden node, is used for doing access and dodges instruction having each other.
The detectable signal duration 64uS of access frame, only account for the part that time slot is very little, on the time period not sending at this time slot, receive the signal of other-end, judge whether access interference according to the situation that receives signal, show to have occurred access collision if find that there is access interference (having received the collision detection signal that other-end sends), continue to receive, find other free timeslot.If access interference do not detected, continue to send out access frame at next 10mS, the detectable signal in this access frame is random generation equally.If collision detected, continue to find free timeslot, repeat access procedure.If all have collision double, think access failure, random wait a period of time is accessed again.If double access frame does not all detect collision, think and can normally take this time slot, access successfully.If can not find idle time slot always, think that network is in full load condition, this thing is if general business receives 10mS frame always, until find idle frame.If high-priority service, the high-priority service that superposes on synchronous head is seized mark, carries out high priority and seizes access.Conflict detectable signal, according to the designing requirement difference of product, also can adopt the mode of frequency spreading code division to send.
Tentatively setting up on the basis of network routing table, system can effectively solve the problem of cluster and data multicast service inundation in the time that use floods algorithm, thereby makes system compared with macroreticular scale in the situation that, still can well support real time business.To point-to-point service, owing to there being a routing table, can utilize existing achievement in research, effectively the performance of optimized network.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the synchronous method of a terminal MANET, it is characterized in that, comprise: adopt gps system or dipper system or adopt the mode of the synchronous time mark that relevant range sends or utilize the mode of the synchronizing signal that terminal sends, or the mode of its combination in any is carried out synchronously.
2. method according to claim 1, is characterized in that, receiving in the environment of gps system or dipper system, adopts gps system or dipper system to carry out synchronously; Not receiving in the environment of gps system or dipper system, adopt the mode of relevant range transmission synchronous time mark to carry out synchronously; Can not receive gps system or dipper system, relevant range does not have in the environment of synchronous time mark yet, and the synchronizing signal of utilizing terminal to send is carried out synchronously.
3. method according to claim 1, is characterized in that, adopts GPS or dipper system to carry out in synchronous situation, and terminal obtains positional information and system absolute time benchmark by GPS or dipper system.
4. method according to claim 1, is characterized in that, described terminal is with the Big Dipper module with emission mode, and under the environment without other transmission means, terminal utilizes the SMS of the Big Dipper to communicate.
5. method according to claim 1, it is characterized in that, the synchronizing signal of utilizing terminal to send synchronously specifically comprises: described terminal is before transmission information, if do not receive the synchronizing signal of other-end, press local clock transmitted signal, the signal that this terminal sends is as the seed synchronizing signal of self-organization network, and other-end is synchronizeed with this seed synchronizing signal.
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| CN201310146587.2A CN104125634A (en) | 2013-04-25 | 2013-04-25 | Terminal ad hoc network synchronization method |
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| CN201310146587.2A CN104125634A (en) | 2013-04-25 | 2013-04-25 | Terminal ad hoc network synchronization method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104270809A (en) * | 2014-10-16 | 2015-01-07 | 成都微址科技有限公司 | Wireless communication device and method based on satellite timing service |
| CN107659368A (en) * | 2017-09-30 | 2018-02-02 | 北京天狼讯业信息技术有限公司 | The slotted synchronous method of handheld communication devices |
| CN108702719A (en) * | 2017-06-27 | 2018-10-23 | 深圳市大疆创新科技有限公司 | Time synchronization method, system and the unmanned plane of unmanned plane |
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| CN1855868A (en) * | 2005-04-28 | 2006-11-01 | 恩益禧电子股份有限公司 | Wireless self-assembly communication system and communication terminal synchronization method in the system |
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| CN1855868A (en) * | 2005-04-28 | 2006-11-01 | 恩益禧电子股份有限公司 | Wireless self-assembly communication system and communication terminal synchronization method in the system |
| CN101668334A (en) * | 2009-09-24 | 2010-03-10 | 彭荣巨 | Method for acquiring TD-SCDMA sync signal in self-adaptive manner, system and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270809A (en) * | 2014-10-16 | 2015-01-07 | 成都微址科技有限公司 | Wireless communication device and method based on satellite timing service |
| CN108702719A (en) * | 2017-06-27 | 2018-10-23 | 深圳市大疆创新科技有限公司 | Time synchronization method, system and the unmanned plane of unmanned plane |
| CN107659368A (en) * | 2017-09-30 | 2018-02-02 | 北京天狼讯业信息技术有限公司 | The slotted synchronous method of handheld communication devices |
| CN107659368B (en) * | 2017-09-30 | 2019-03-15 | 北京天狼讯业信息技术有限公司 | A kind of synchronizer and synchronous method of handheld communication devices |
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