CN104796919B - A kind of Terahertz protocol of wireless local area network framework that double frequency combines - Google Patents
A kind of Terahertz protocol of wireless local area network framework that double frequency combines Download PDFInfo
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Abstract
The invention discloses the Terahertz protocol of wireless local area network frameworks that a kind of double frequency combines, including physical layer and data link layer；Physical layer includes 2.4GHz PHY and Terahertz PHY based on 802.11 agreements, and data link layer includes two-stage media access control sublayer, and two-stage media access control sublayer is independent lower MAC layer and public upper MAC layer；MAC layer includes MAC layer under lower MAC layer and Terahertz based on 802.11 agreements under the independence；The present invention is carried out in user's access and slow data transmission using 2.4GHz frequency range Wi Fi, ensure that the wide coverage area characteristic of LAN；It is switched to Terahertz frequency range again when needing to carry out high speed data transfer, carries out Terahertz high speed data transfer, ensure that the high-rate characteristics of Terahertz LAN；So that Terahertz WLAN has compared with the ability for providing superelevation rate connected network communication in large coverage.
Description
Technical field
The present invention relates to wireless communication technology field, the Terahertz protocol of wireless local area network structure of specifically a kind of double frequency combination
Frame.
Background technology
The Wi-Fi locals based on agreements such as 802.11a/b/g/n for the 2.4GHz/5GHz frequency ranges being used widely at present
The procotol framework of net simplifies reference model as shown in Figure 1, it is broadly divided into physical layer（PHY）And data link layer（MAC）,
MAC layer is made of MAC protocol sublayer and MAC management modules, and PHY layer is relied on by physical media（PMD）Sublayer, physical layer protocol convergence
（PLCP）Sublayer and PHY management modules composition.
Communication frequency generally uses 2.4GHz or 5GHz, antenna to be all made of near omni-directional antennas in this network structure,
To ensure larger cyberspace coverage area.However, electromagnetic wave is in the loss of free space and square positive correlation of frequency, i.e.,
Carrier frequency often improves a magnitude, and the free space loss of electromagnetic wave will improve 20 decibels（dB）, the reception letter of communication system
It makes an uproar than 20dB will be reduced.Therefore in Terahertz frequency range（Carrier frequency is between 100GHz to 10THz）, due to communication carrier frequency
Nearly two magnitudes or more are improved than the existing Wi-Fi 2.4GHz/5GHz used, the received signal to noise ratio of communication system will reduce closely
40dB or more requires to reach received signal to noise ratio identical with original communication system in the case where transmission power is constant
Dual-mode antenna gain improves nearly 40dB or more.It is known that the antenna beamwidth of 10dB gains is about 45 degree, and 35dB
The antenna beamwidth of gain just only only has 2.6 degree, reduces a magnitude or more.Therefore, in Terahertz frequency range structure
Due to the raising of carrier frequency, antenna beamwidth will greatly narrow WLAN, and coverage area will drastically reduce, existing
Wi-Fi network structure cannot achieve effective big regional extent covering.
In order to solve the problems, such as this coverage area, a kind of possible technical solution is using beam forming and control skill
Art, such as phased array antenna are carried out quickly scanning alignment in the way of beam forming and electric scanning, be communicated again after alignment.
This technical solution is used in the WLAN of 60GHz frequency ranges/personal area network agreement 802.15.3c and 802.11ad.
802.15.3c the beam control scheme used in is as shown in Fig. 2, its user access and wave beam are aligned by adjusting beam angle in real time
It realizes, i.e., gradually adjusts antenna beamwidth toward fine be directed toward from half omnidirectional in user's access phase, locking step by step is used
Family region recycles the antenna of highly directional high-gain to carry out high speed data transfer communication after being accurately directed to alignment.
The beam control scheme that is used in 802.11ad as shown in figure 3, its user access and wave beam alignment point sending and receiving end carry out respectively,
I.e.：In user's access phase, receiving terminal first receives signal near omni-directional antennas, and transmitting terminal adjusts launching beam direction in real time,
Omni-directional antenna transmission signal is used instead after finding best be directed toward, and it is to be accurately directed to simultaneously adjust its wave beam in real time that receiving terminal adjusts antenna again
Direction, after finding optimum reception direction, receiving-transmitting sides carry out fine alignment using highly directional antenna simultaneously again, to reach best
Alignment result, followed by high speed data transfer communicate.
Since Terahertz frequency range ratio 60GHz frequency ranges are 1 times or more at least high again, the gain of antenna will bigger,
Beam angle is narrower, if the technical solution communicated again using this similar scanning alignment in Terahertz frequency range, needs
Scanning alignment the time will be longer, to reduce the whole efficiency of LAN.Meanwhile this scanning Pointing strategy itself
It is extremely complex and cumbersome, is difficult to realize in practical applications.In addition, the core electron device of Terahertz frequency range is not enough
Maturation, the phased array chip for producing Terahertz frequency range is also relatively difficult, therefore the current generation uses beam forming and control program also
It is unrealistic.It is poor to characteristics such as the penetrating of substance, diffractions furthermore since the wavelength of Terahertz frequency range is very short, indoors
It is easy to be blocked by human body, article etc. and cannot achieve efficient communication when local area network applications, scanning at this time is directed at the communication technology again
It will failure.
Invention content
The present invention is in order to solve the above technical problems, propose a kind of by the 2.4GHz frequency ranges Wi-Fi based on 802.11 agreements
The double frequency of LAN and high speed Terahertz communication link combine Terahertz protocol of wireless local area network framework, user access and
It is carried out using 2.4GHz frequency ranges Wi-Fi when slow data transmission, ensure that the wide coverage area characteristic of LAN；It is needing to carry out
Terahertz frequency range is switched to when high speed data transfer again, Terahertz high speed data transfer is carried out, ensure that Terahertz LAN
High-rate characteristics；So that Terahertz WLAN has compared with the energy for providing superelevation rate connected network communication in large coverage
Power, to for the communication of high speed Terahertz narrow beam and the desired contradiction of wide coverage area of LAN to provide one kind possible
Solution route.
Technical scheme is as follows：
A kind of Terahertz protocol of wireless local area network framework that double frequency combines, it is characterised in that：Including physical layer（PHY）Sum number
According to link layer（MAC）；Physical layer includes 2.4GHz PHY based on 802.11 agreements and Terahertz PHY, data link layer include
Two-stage media access control sublayer, two-stage media access control sublayer are independent lower MAC layer and public upper MAC layer；MAC layer includes being based under the independence
MAC layer under the lower MAC layer and Terahertz of 802.11 agreements.
Whole network communication is divided into both of which：Wi-Fi mode and Terahertz pattern（THz patterns）；Wi-Fi mode is complete
Compatible existing Wi-Fi standards, provide with the identical functions of existing Wi-Fi, including：Slow data transmission, entire terahertz
Hereby the access control, instruction transmission, disconnection control, insertion authority control, roaming of WLAN, safety, multi-user management etc.
Function；THz patterns are used to carry out the data transmit-receive function of Terahertz antenna alignment and superelevation rate.
Selection and data distribution of the public upper MAC layer for communication pattern judge that it is low to need the data sent
Fast data or high-speed data then utilize Wi-Fi mode to send, are then used if it is a large amount of high-speed datas if it is low speed data
Terahertz pattern is sent.
The lower MAC layer based on 802.11 agreements and the 2.4GHz PHY based on 802.11 agreements provide existing Wi-Fi
The physical layer and data link layer of standard are supported, realize Wi-Fi mode function.
MAC layer and Terahertz PHY layer provide the superelevation rate data transmit-receive function under Terahertz pattern under the Terahertz.
Ultrahigh speed data under the Terahertz pattern receives and dispatches process, i.e., carries out high-speed data under Wi-Fi mode first
User's access request of transmission controls and the alignment of the wave beam of Terahertz antenna（Wave beam alignment can use phased array antenna or mechanical turntable
Antenna is realized）, the negotiation of receiving-transmitting chain parameter is then completed, and parameter is handed down to Terahertz PHY, finally utilizes the ginseng negotiated
Number carries out the transmitting-receiving of high-speed data under Terahertz link.
User access control and the detailed process of terahertz wave beam alignment are as follows：
First, it in the access request stage, is not aligned with since the terahertz wave beam of receiving-transmitting sides is particularly likely that,
It needs to transmit access request based on the Wi-Fi standards of 802.11 agreements using traditional, that is, utilizes the Wi- containing omnidirectional antenna
Fi standards transmit access request and terahertz wave beam scan request；
Secondly, in wave beam alignment stage, receiving-transmitting sides carry out the thick of both sides position first with technologies such as MIMO in Wi-Fi
Estimation, and utilize the coarse alignment of location information guiding THz wave beam control system progress terahertz wave beam；
Then, receiving-transmitting sides carry out the fine alignment of terahertz wave beam by the iterative scans mode that cooperates again, during being somebody's turn to do
Control information and the interactions of the information such as alignment be transmitted by Wi-Fi links；
Finally, then on the Terahertz link of foundation the data transmission of ultrahigh speed rate is carried out.
Beneficial effects of the present invention are as follows：
1. the Wi-Fi communications using 2.4GHz frequency ranges ensure that the wide coverage area characteristic of LAN and compared with low rate
Communication performance ensure that the communication characteristic of superelevation rate using Terahertz communication so that Terahertz WLAN have compared with
The ability that superelevation rate connected network communication is provided in large coverage requires for the narrow beam that high speed Terahertz communicates with LAN
The contradiction of wide coverage area provides a kind of possible solution route.
2. framework that double frequency combines and using 2.4GHz frequency ranges progress communicating pair position according to a preliminary estimate, alignment information
Interaction, link parameter are negotiated etc., avoid complicated phased array beam molding and scanning Pointing strategy, shorten the alignment time,
Improve the whole efficiency of network.
3. Terahertz WLAN ensure that work as and be deposited in local area network applications using the Wi-Fi communications of 2.4GHz frequency ranges
When human body, article etc. block, the reliable connected network communication that existing Wi-Fi speed grades are provided is remained able to, it is logical without network
Letter interrupts.
4. mutatis mutandis phased array antenna or mechanical turntable antenna may be implemented in terahertz wave beam so that Terahertz
Wave beam is aligned in the also jejune period of Terahertz phased-array technique at this stage and also has feasibility.
Description of the drawings
Fig. 1 is existing Wi-Fi network Protocol REference Model schematic diagram；
Fig. 2 is the beam control scheme schematic diagram in existing 802.15.3c agreements；
Fig. 3 is the beam control scheme schematic diagram in existing 802.11ad agreements；
Fig. 4 is the architecture model schematic diagram of the present invention；
Fig. 5 is Terahertz superelevation rate data transmit-receive process schematic of the present invention.
Specific implementation mode
A kind of Terahertz protocol of wireless local area network framework that double frequency combines, the whole network protocol frame model of proposition is as schemed
Shown in 4, including physical layer（PHY）And data link layer（MAC）；Physical layer include 2.4GHz PHY based on 802.11 agreements and
Terahertz PHY, data link layer include two-stage media access control sublayer, and two-stage media access control sublayer is independent lower MAC layer and public upper MAC layer；Institute
It includes MAC layer under lower MAC layer and Terahertz based on 802.11 agreements to state independent lower MAC layer.
Whole network communication is divided into both of which：Wi-Fi mode and Terahertz pattern（THz patterns）；Wi-Fi mode is complete
Compatible existing Wi-Fi standards, provide with the identical functions of existing Wi-Fi, including：Slow data transmission, entire terahertz
Hereby the access control, instruction transmission, disconnection control, insertion authority control, roaming of WLAN, safety, multi-user management etc.
Function；THz patterns are used to carry out the data transmit-receive function of Terahertz antenna alignment and superelevation rate.
Selection and data distribution of the public upper MAC layer for communication pattern judge that it is low to need the data sent
Fast data or high-speed data then utilize Wi-Fi mode to send, are then used if it is a large amount of high-speed datas if it is low speed data
Terahertz pattern is sent.
The lower MAC layer based on 802.11 agreements and the 2.4GHz PHY based on 802.11 agreements provide existing Wi-Fi
The physical layer and data link layer of standard are supported, realize Wi-Fi mode function.
MAC layer and Terahertz PHY layer provide the superelevation rate data transmit-receive function under Terahertz pattern under the Terahertz.
High-speed data under the Terahertz pattern receives and dispatches process, as shown in figure 5, being carried out under Wi-Fi mode first
User's access request of high speed data transfer controls and the alignment of the wave beam of Terahertz antenna（Wave beam alignment can use phased array antenna or
Mechanical turntable antenna is realized）, the negotiation of receiving-transmitting chain parameter is then completed, and parameter is handed down to Terahertz PHY, finally utilized
The parameter of negotiation carries out the transmitting-receiving of high-speed data under Terahertz link.
User access control and the detailed process of terahertz wave beam alignment are as follows：
First, it in the access request stage, is not aligned with since the terahertz wave beam of receiving-transmitting sides is particularly likely that,
It needs to transmit access request based on the Wi-Fi standards of 802.11 agreements using traditional, that is, utilizes the Wi- containing omnidirectional antenna
Fi standards transmit access request and terahertz wave beam scan request；
Secondly, in wave beam alignment stage, receiving-transmitting sides carry out the thick of both sides position first with technologies such as MIMO in Wi-Fi
Estimation, and utilize the coarse alignment of location information guiding THz wave beam control system progress terahertz wave beam；
Then, receiving-transmitting sides carry out the fine alignment of terahertz wave beam by the iterative scans mode that cooperates again, during being somebody's turn to do
Control information and the interactions of the information such as alignment be transmitted by Wi-Fi links；
Finally, then on the Terahertz link of foundation the data transmission of ultrahigh speed rate is carried out.
Claims (3)
1. the Terahertz protocol of wireless local area network framework that a kind of double frequency combines, it is characterised in that：Including physical layer and data link
Layer；Physical layer includes 2.4GHz PHY and Terahertz PHY based on 802.11 agreements, and data link layer includes two-stage media access control sublayer,
Two-stage media access control sublayer is independent lower MAC layer and public upper MAC layer；MAC layer includes based under 802.11 agreements under the independence
MAC layer under MAC layer and Terahertz；Whole network communication is divided into both of which：Wi-Fi mode and Terahertz pattern；
Selection and data distribution of the public upper MAC layer for communication pattern judge that it is low speed number to need the data sent
According to still high-speed data, then Wi-Fi mode is utilized to send if it is low speed data, terahertz is then used if it is a large amount of high-speed datas
Hereby pattern is sent；The lower MAC layer based on 802.11 agreements and the 2.4GHz PHY based on 802.11 agreements provide Wi-Fi marks
Accurate physical layer and data link layer is supported, realizes Wi-Fi mode function；MAC layer and Terahertz PHY layer carry under the Terahertz
For the superelevation rate data transmit-receive function under Terahertz pattern；
User access control and the flow of terahertz wave beam alignment are as follows：
First, in the access request stage, access request and terahertz wave beam are transmitted using the Wi-Fi standards containing omnidirectional antenna
Scan request；
Secondly, in wave beam alignment stage, receiving-transmitting sides carry out the rough estimate of both sides position, and profit first with the technology in Wi-Fi
The location information guiding THz wave beam control system obtained with rough estimate carries out the coarse alignment of terahertz wave beam；
Then, receiving-transmitting sides carry out the fine alignment of terahertz wave beam by the iterative scans mode that cooperates again, which hands over
Mutually it is transmitted by Wi-Fi links；
Finally, then on the Terahertz link of foundation the data transmission of ultrahigh speed rate is carried out.
2. the Terahertz protocol of wireless local area network framework that a kind of double frequency according to claim 1 combines, it is characterised in that：Too
Ultrahigh speed data under hertz pattern receives and dispatches process, i.e., user's access that high speed data transfer is carried out first under Wi-Fi mode
Request control and the wave beam alignment of Terahertz antenna, then complete the negotiation of receiving-transmitting chain parameter, and parameter is handed down to terahertz
Hereby PHY finally carries out the transmitting-receiving of high-speed data using the parameter negotiated under Terahertz link.
3. the Terahertz protocol of wireless local area network framework that a kind of double frequency according to claim 1 combines, it is characterised in that：Institute
Wave beam alignment is stated to realize using phased array antenna or mechanical turntable antenna.
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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 |
| CN107888225A (en) * | 2017-10-27 | 2018-04-06 | 深圳市太赫兹科技创新研究院有限公司 | Wireless communications method and equipment |
| CN108183738B (en) * | 2017-12-28 | 2020-05-08 | 中国电子科技集团公司第五十四研究所 | Terahertz communication space division and time division hybrid multiple access method based on active antenna array |
| CN111130615B (en) | 2018-10-30 | 2021-06-22 | 华为技术有限公司 | APT subsystem and communication system of spacecraft |
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