CN104684026B - A kind of data distribution and cut-in method suitable for Terahertz Dual Band network - Google Patents
A kind of data distribution and cut-in method suitable for Terahertz Dual Band network Download PDFInfo
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- CN104684026B CN104684026B CN201510110534.4A CN201510110534A CN104684026B CN 104684026 B CN104684026 B CN 104684026B CN 201510110534 A CN201510110534 A CN 201510110534A CN 104684026 B CN104684026 B CN 104684026B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/06—Access restriction performed under specific conditions based on traffic conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a kind of data distribution and access mechanism suitable for Terahertz Dual Band network, is specifically：The network control module in STA first checks whether user or upper strata have new data to send at any one time；When there is new data to send, the data volume to be sent that upper strata is provided is added in existing data total amount to be sent, then by the data total amount to be sent after addition compared with the threshold value H set, judge that data are transmitted by WiFi transmission or by Terahertz channel according to comparative result；When carrying out high-speed transfer using Terahertz channel, if Terahertz directional aerial misalignment, data to be sent are sent by WiFi module, Network access control flow is entered after alignment；STA can determine whether that the transmission of data can be carried out by Terahertz channel by the present invention, wherein comprising data distribution control and Network access control, ensure that the rate that makes full use of of Terahertz channel, without the process of moving back is kept away at random, improve the utilization ratio of channel.
Description
Technical field
The present invention relates to the data distribution in Terahertz Dual Band network and access mechanism, belong to wireless communication technology field,
A kind of specifically data distribution and cut-in method suitable for Terahertz Dual Band network.
Background technology
Existing wide variety of WiFi network is communicated using 2.4GHz or 5GHz, the simplified model of WiFi network framework
As shown in figure 1, it is broadly divided into physics（PHY）Layer and medium education（MAC）Layer, MAC layer are managed by MAC protocol sublayer and MAC
Module composition is managed, PHY layer is relied on by physical media（PMD）Sublayer, physical layer protocol convergence（PLCP）Sublayer and PHY management module groups
Into.
If launching identical signal in similar frequency bands in the presence of more than one equipment simultaneously in network, equipment room can be caused
Interference, cause communication receiver can not receive any one equipment transmitting signal.In WiFi network, synchronization is same
There can only be an equipment transmission signal in one frequency range, other equipment must keep radio listening silence state, to avoid " conflicting ".Net
Network access mechanism ensures that each equipment can launch in turn, realizes more equipment and Network Access Point（It is abbreviated as AP, generally router
Or interchanger）Fair communication, reach the purpose of network resources locating.Access mechanism in WiFi network is referred to as " carrier sense
Multiple spot access/collision avoids "（CSMA/CA）, it is network node（User terminal, also referred to as " terminal ", it is abbreviated as STA）Carrying out nothing
For reducing a kind of specific method of conflict during line medium access.
CSMA/CA mechanism includes the content of two aspects.First, whether carrier sensing method, have for equipment detection network
Other equipment transmission signal in some frequency range；Second, collision avoids, ensure only one when multiple equipment has access demand
Individual equipment priority access, avoid and meanwhile signal transmitting.
Carrier sensing method can be divided into PHY layer carrier sense again and MAC layer virtual carrier monitors two kinds of approach.PHY layer
Carrier sense judges whether there is signal transmitting in environment by phy receiver to the presence or absence of antenna reception signal and power, i.e.,
The busy-idle condition of monitor channel, and snoop results are reported to upper strata.MAC layer virtual carrier monitors a title by MAC layer
For network allocation vector（NAV）Mechanism realize.NAV is the counter of a countdown, needs to carry out radio hair earliest
The equipment penetrated（Referred to as source station）It is needed into the time announcement of busy channel to other equipment, other equipment is during this period of time all
Stop data sending, so as to reduce collision." virtual " refers to that other equipment does not have actual monitor channel, but according to source station
Notice keeps silent status, reaches the effect of similar monitor channel.
Collision is avoided keeping away using one kind referred to as binary system index and moved back（BEB）Algorithm.Keep away the process of moving back as shown in Fig. 2
Wherein transverse axis is time quantum.From device A from left to right（Station A）After data have been sent, by a frame period time DIFS
（It is defined as 128 μ s）, each equipment can during this period of time detect that channel is in idle condition, and in ensuing competition window
（CWindow）Carry out the contention access of channel in time.Equipment B, C, the D for having transmission demand each set a duration random
Keep away and move back（Backoff）Countdown clock, B, C, D keep the monitoring to channel in this period, once detect that channel is in
" busy " state（Indicate that other equipment starts transmission signal）, the countdown clock of corresponding device is to be suspended, and equipment enters hair
Penetrate silent status.Equipment C count down time is most short in figure, and after the time arrives, equipment detects that channel is still idle, that is, represents to set
Standby C has obtained the authority of transmitting, starts to send data.Equipment B, D is now moved back in the time still in keeping away, and detecting in channel has
Signal is launched, and countdown clock is suspended, repeated after equipment C is sent it is above-mentioned keep away the process of moving back, but countdown clock not by
Reset, and be to continue with the countdown remaining time.This ensures that synchronization only has a hold facility channel in network,
Avoid conflict.It can be seen that within the competition window time, channel is in idle condition.
Terahertz Dual Band network refers in network while uses the WiFi network communication technology and Terahertz frequency range（0.1THz~
10THz）The communication technology, realize that WiFi signal realizes that high-speed transfer is realized in a wide range of network coverage, terahertz signal, be a kind of complete
The new network architecture, its network architecture are as shown in Figure 3.It is roughly divided into physical layer（PHY）And Medium Access Layer（MAC）.PHY layer bag
Containing the PHY based on 802.11 agreements and Terahertz PHY, MAC layer includes two-stage media access control sublayer：Lower MAC layer based on 802.11 agreements
And MAC layer, public upper MAC layer under Terahertz.The communication pattern of equipment can be divided into WiFi patterns and Terahertz pattern, WiFi patterns
Completely compatible existing WiFi standards, there is provided with the identical functions of existing WiFi, be mainly used in the big model of Logistics networks signal
Covering is enclosed, while slow data transmission is provided（150Mbps to 800Mbps, typically in below 1Gbps）And the control of whole network
System and management etc..Terahertz pattern carries out superelevation speed using Terahertz channel（May be up to 10Gbps, or even 100Gbps with
On）Data transmit-receive.Public upper MAC layer mainly completes selection and the data distribution of communication pattern.Based under 802.11 agreements
MAC layer and PHY layer provide the support to existing WiFi standards.MAC layer and Terahertz PHY layer provide Terahertz pattern under Terahertz
Under superelevation speed data transmit-receive function.WiFi and Terahertz frequency range have independent uplink and downlink channel.
Terahertz frequency range communication typically uses gain directional antenna, and antenna beamwidth is substantially in or so several years.Because
The received signal to noise ratio of communication and the wave frequency of use, if not using gain directional antenna, are into inverse square relation
Reach identical received signal to noise ratio, the transmission power required for Terahertz frequency range is 10,000 times of frequency range residing for WiFi, and this is aobvious
It can not so realize.
Because access point（AP）Receiver there was only one（Although can actually design it is multiple, it is contemplated that wherein special
Some fixed, analysis below process and result are not influenceed）, synchronization only allows a terminal（STA）Launch terahertz to AP
Hereby signal, so Terahertz channel equally faces the access problem similar with traditional WiFi network in Terahertz Dual Band network.Cause
For the high directionality of antenna, the CSMA/CA access mechanisms used in WiFi network can not well adapt to Terahertz Dual Band network,
Enumerate two of which main cause：First, even if some STA, to AP directional transmissions terahertz signals, other STA have very much can
Signal can not be received on reception antenna, also can not just carry out physical-layer carrier monitoring；Second, even if other STA have certain
Kind carrier sense mechanisms, but its efficiency or time delay can not be comparable with physical-layer carrier monitoring mechanism, if using by force
CSMA/CA access mechanisms, it is more likely that cause the considerable decrease of network efficiency.
Therefore a set of new unique method for network access is needed, on the premise of network efficiency is significantly reduced, to protect
Demonstrate,prove in the same channel of synchronization and there was only a terminal to AP directional transmissions signals.
The content of the invention
The present invention is in order to solve the above technical problems, providing a kind of data distribution suitable for Terahertz Dual Band network and connecing
Enter method, the STA in network according to the transmission that can determine whether can to carry out data by this method by Terahertz channel,
Wherein comprising data distribution control and Network access control two parts content.
Technical scheme is as follows：
A kind of data distribution and cut-in method suitable for Terahertz Dual Band network, it is characterised in that：
First, at any one time, the network control module in STA first checks whether user or upper strata have new data to send out
Send；When there is new data to send, then the data volume to be sent provided upper strata is added in existing data total amount to be sent,
Then by all data total amounts to be sent after addition compared with the threshold value H set；If data total amount to be sent is less than
H, then keep WiFi transmission modes, and data to be sent are sent by WiFi module；If data total amount to be sent is more than H, pending
Data are sent to be transmitted by Terahertz channel；When carrying out high-speed transfer using Terahertz channel, network control module first detects too
Whether hertz directional aerial is in alignment；If Terahertz directional aerial is in misalignment state, need first to determine Terahertz
It is aligned to antenna, before Terahertz directional aerial misalignment, data to be sent transfer to WiFi module to send；When network control
Molding block detects that Terahertz directional aerial is in alignment, then into Network access control flow.
, it is necessary to be first directed at Terahertz directional aerial, by network when Terahertz directional aerial is in misalignment state
Control module notifies that physical layer or user are aligned.Specifically alignment is：Physical layer is phased using automatic beam scanning
Array antenna alignment；User uses manual alignment mode.
After network control module detects the alignment of Terahertz directional aerial, it is impossible to send data to AP immediately, otherwise will make
Into " collision " of Terahertz channel.Some STA can take Terahertz up channel, it is necessary to meet：（1）The STA must have
The up sending permission of data is sent to AP；（2）Up channel from STA to AP necessarily be in idle condition.
When not possessing up sending permission, data to be sent are still sent STA by WiFi module, to avoid data to be sent
Congestion cause to postpone for a long time.Synchronization can only have a STA to possess up sending permission in Terahertz Dual Band network,
The authority needs by WiFi network to AP to be applied from STA.Application can be submitted at Terahertz up channel " busy ", i.e.,
Do not influenceed by up channel current state.AP is when receiving STA up transmission application, according to network the present situation to institute
The authority for having the STA of up transmission demand is ranked, and is sequentially allocated up sending permission.
Whether idle it is currently owned by the STA monitoring up channels of up sending permission, once detecting the free time, starts immediately
Upstream data is sent, and completes the access of channel.Data transmission procedure after channel busy monitor function and access（Such as shake hands, send out
Send）There is provided by physical layer.
Beneficial effects of the present invention are as follows：
1. compared with traditional C/S MA/CA methods, cut-in method proposed by the present invention takes full advantage of Terahertz frequency range at a high speed
Transmission and the advantage of the wide covering of WiFi frequency band signals, overcome the CSMA/CA cut-in methods of directly transplanting in novel double-frequency network
In be difficult to be applicable the problem of.
2. when Terahertz high-speed transmission channel is unavailable, flow-dividing control method ensures that data still can pass through WiFi
Network is transmitted, and ensure that the throughput efficiency of network and experience effect unobvious are less than existing WiFi network in new network,
It is a kind of more advanced access control method.
3. the method for utilizing the application of up channel sending permission and distribution, it ensure that Terahertz channel once idle horse back
It will be available to be utilized by the other terminals, without being kept away the process of moving back at random again, avoid and channel is competed in the time during CSMA/CA not
The shortcomings that being utilized, improve the utilization ratio of channel.
Brief description of the drawings
Fig. 1 is the simplified model schematic diagram of existing WiFi network framework；
Fig. 2 is that the keeping away of avoiding of collision of existing CSMA/CA mechanism moves back process schematic；
Fig. 3 is the configuration diagram of existing Terahertz Dual Band network；
Fig. 4 is the method for network access flow chart of the present invention.
Embodiment
As shown in figure 4, a kind of data distribution and cut-in method suitable for Terahertz Dual Band network, its idiographic flow is such as
Under：
First, at any one time, the network control module in STA first checks whether user or upper strata have new data to send out
Send；
When there is new data to send, then it is total that the data volume to be sent that provides upper strata is added to existing data to be sent
In amount, then by all data total amounts to be sent after addition compared with the threshold value H set；
If data total amount to be sent is less than H, WiFi transmission modes are kept, data to be sent are by WiFi module（Realize
The function of 802.11 times MAC layers and PHY layer in Fig. 3）Send；If data total amount to be sent is more than H, data to be sent are by too
Hertz channel is transmitted；
When carrying out high-speed transfer using Terahertz channel, network control module first detects whether Terahertz directional aerial is in
Alignment；If Terahertz directional aerial is in misalignment state, need first to be directed at Terahertz directional aerial,
Before Terahertz directional aerial misalignment, data to be sent transfer to WiFi module to send；When network control module detects terahertz
Hereby directional aerial is in alignment, then into Network access control flow.
, it is necessary to be first directed at Terahertz directional aerial, by network when Terahertz directional aerial is in misalignment state
Control module notifies that physical layer or user are aligned.Specifically alignment is：Physical layer is phased using automatic beam scanning
Array antenna alignment；User uses manual alignment mode.
After network control module detects the alignment of Terahertz directional aerial, it is impossible to send data to AP immediately, otherwise will make
Into " collision " of Terahertz channel.Some STA can take Terahertz up channel, it is necessary to meet：（1）The STA must have
The up sending permission of data is sent to AP；（2）Up channel from STA to AP necessarily be in idle condition.
When not possessing up sending permission, data to be sent are still sent STA by WiFi module, to avoid data to be sent
Congestion cause to postpone for a long time.Synchronization can only have a STA to possess up sending permission in Terahertz Dual Band network,
The authority needs by WiFi network to AP to be applied from STA.Application can be submitted at Terahertz up channel " busy ", i.e.,
Do not influenceed by up channel current state.AP is when receiving STA up transmission application, according to network the present situation to institute
The authority for having the STA of up transmission demand is ranked, and is sequentially allocated up sending permission.
Whether idle it is currently owned by the STA monitoring up channels of up sending permission, once detecting the free time, starts immediately
Upstream data is sent, and completes the access of channel.Data transmission procedure after channel busy monitor function and access（Such as shake hands, send out
Send）There is provided by physical layer.
Claims (8)
- A kind of 1. data distribution and cut-in method suitable for Terahertz Dual Band network, it is characterised in that：First, a period of time in office Carve, the network control module in STA first checks whether user or upper strata there are new data to send；When there is new data to send When, then the data volume to be sent provided upper strata is added in existing data total amount to be sent, then will be needed after addition Data total amount is sent compared with the threshold value H set；If data total amount to be sent is less than H, WiFi transmission modes are kept, Data to be sent are sent by WiFi module；If data total amount to be sent is more than H, data to be sent are carried out by Terahertz channel Transmission；Using Terahertz channel carry out high-speed transfer when, network control module first detect Terahertz directional aerial whether in pair Quasi- state；If Terahertz directional aerial is in misalignment state, need first to be directed at Terahertz directional aerial, in Terahertz Before directional aerial misalignment, data to be sent transfer to WiFi module to send；Network control module detects that Terahertz orients day , it is necessary to meet that two conditions could send data to AP, described two conditions are after line alignment：（1）STA, which must have to AP, to be sent out Send the up sending permission of data；（2）Up channel from STA to AP is in idle condition；When network control module detects Terahertz directional aerial is in alignment, then into Network access control flow.
- 2. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 1, its feature It is：It is to be network controlled module to notify that physical layer or user are aligned when Terahertz directional aerial is aligned.
- 3. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 2, its feature It is：When being aligned by physical layer to Terahertz directional aerial, it is aligned using the phased-array antenna of automatic beam scanning Mode.
- 4. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 2, its feature It is：It is punctual that team is carried out to Terahertz directional aerial by user, using manual alignment mode.
- 5. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 1, its feature It is：When not possessing up sending permission, data to be sent are still sent STA by WiFi module.
- 6. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 1, its feature It is：In Terahertz Dual Band network, synchronization can only have a STA to possess up sending permission, and sending permission is passed through by STA WiFi network carries out up send to AP and applied.
- 7. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 6, its feature It is：When AP receives STA up transmission application, AP is according to network the present situation to all STA for having up transmission demand Authority rank, be sequentially allocated up sending permission.
- 8. a kind of data distribution and cut-in method suitable for Terahertz Dual Band network according to claim 7, its feature It is：Whether idle possess the STA monitoring up channels of up sending permission, when STA detects the up channel free time, immediately Start upstream data to send, complete the access of channel.
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| CN105141695A (en) * | 2015-09-16 | 2015-12-09 | 成都福兰特电子技术股份有限公司 | Terahertz wireless local area network protocol architecture |
| CN106253993B (en) * | 2016-10-11 | 2017-08-25 | 深圳市太赫兹科技创新研究院 | A kind of long-range Terahertz communication system |
| US20230199509A1 (en) * | 2020-05-29 | 2023-06-22 | Beijing Xiaomi Mobile Software Co., Ltd. | Communication method and apparatus, and computer-readable storage medium |
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