CN102201891B - Wireless frame transmission method and device - Google Patents
Wireless frame transmission method and device Download PDFInfo
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- CN102201891B CN102201891B CN201110117423.8A CN201110117423A CN102201891B CN 102201891 B CN102201891 B CN 102201891B CN 201110117423 A CN201110117423 A CN 201110117423A CN 102201891 B CN102201891 B CN 102201891B
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- vht
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- long training
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Communication Control (AREA)
- Radio Transmission System (AREA)
Abstract
The invention discloses a wireless frame transmission method and a wireless frame transmission device. The wireless frame transmission method comprises the following steps of: transmitting a null data packet (NDP) to a receiver, wherein the NDP comprises at least two very high throughput (VHT) long training fields (VHT-LTF), and the maximum number of the VHT-LTFs is determined according to the number of the VHT-LTFs which can be supported by at least one receiver. By the transmission method and the transmission device, the maximum number of the VHT-LTFs in the NDP is determined.
Description
Technical field
The present invention relates to wireless communication technology field, especially a kind of sending method of radio frames and device.
Background technology
WLAN (Wireless Local Area Networks is called for short WLAN) is that the employing wireless communication technology is interconnected by computer equipment, forms the network system that can communicate mutually and realize resource-sharing.The essence of WLAN (wireless local area network) is the connected mode being replaced wire cable by the mode of wireless connections, realizes the radio interconnected of computer and network, thus makes the movement of the structure of network and terminal more flexible.
Institute of Electrical and Electric Engineers (Institute for Electrical and ElectronicEngineers, be called for short IEEE) 802.11 are one of mainstream technologys of current WLAN (wireless local area network), this agreement mainly defines physical layer (PHY) and MAC layer (MAC) specification.Along with the development of mobile communication technology and people are to the raising of the demand of wireless network, physical layer specification, towards the high direction development of speed goes, experienced by 801.11 to 802.11b, then to 802.11a/g, then 802.11n, finally arrives the development course of 802.11ac.Actual physical technique also develops into OFDM (Orthogonal Frequency Division Multiplexing from direct sequence spread spectrum skill, be called for short OFDM) technology, and in IEEE802.11n, introduce multi-antenna technology, large bandwidth and multi-user's multiple-input and multiple-output (Multi-User Multiple Input Multiple Output, referred to as MU-MIMO) is introduced in IEEE802.11ac.
Current I EEE802.11ac system specifies, when needs receiving terminal is to transmitting terminal feedback channel information, transmitting terminal sends NDPA (Null Data Packet Announcement to receiving terminal, feedback request frame) and NDP (Null Data Packet, channel measurement frame), require STA (the being equivalent to receiving terminal) feedback channel information of the STA in NDPA (website) information field corresponding address.
Wherein, channel measurement frame NDP form as shown in Figure 1, comprising: L-STF (long training sequence), S-STF (short training sequence), L-SIG (signal domain), VHT-SIG-A (VHT signal A territory), VHT-STF (VHT short training sequence), VHT-LTF (the long training domain of VHT) and VHT-SIG-B (VHT signal B territory).
A kind of determination method and apparatus of maximum of the number for the VHT-LTF in channel measurement frame NDP is lacked in prior art.
Summary of the invention
The main technical problem to be solved in the present invention is, provides a kind of sending method and device of radio frames, can determine the maximum number of the long training domain VHT-LTF of VHT in channel measurement frame NDP.
For solving the problems of the technologies described above, the invention provides a kind of sending method of radio frames, comprising step: measure frame NDP to receiving terminal transmitting channel; Described channel measurement frame NDP comprises at least two long training domain VHT-LTF of VHT, and the number of the long training domain VHT-LTF of VHT that the maximum number of described VHT long training domain VHT-LTF can be supported according at least one receiving terminal is determined.
Further, when for a receiving terminal, described maximum number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of this receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Further, when for multiple receiving terminal, described maximum number is the minimum value in the number of the long training domain VHT-LTF of VHT that each receiving terminal can be supported.
Further, for each receiving terminal, the number of its VHT that can support long training domain VHT-LTF is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of described receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Further, the number arranging the VHT long training domain VHT-LTF comprised in channel measurement frame NDP is identical with the Nsts indicated in VHT signal A territory VHT-SIG-A.
Further, described channel measurement frame NDP is made up of long training sequence L-STF, short training sequence S-STF, signal domain L-SIG, VHT signal A territory VHT-SIG-A, VHT short training sequence VHT-STF, at least two long training domain VHT-LTF of VHT.
A dispensing device for radio frames, described dispensing device, for measuring frame NDP to receiving terminal transmitting channel; Described channel measurement frame NDP comprises at least two long training domain VHT-LTF of VHT, and the VHT long training domain VHT-LTF number that the maximum number of described VHT long training domain VHT-LTF can be supported according at least one receiving terminal is determined.
Further, when for a receiving terminal, described maximum number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of this receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Further, when for multiple receiving terminal, described maximum number is the minimum value in the number of the long training domain VHT-LTF of VHT that each receiving terminal can be supported; For each receiving terminal, its VHT that can support long training domain VHT-LTF number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of described receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Further, described channel measurement frame NDP is made up of long training sequence L-STF, short training sequence S-STF, signal domain L-SIG, VHT signal A territory VHT-SIG-A, VHT short training sequence VHT-STF, at least two long training domain VHT-LTF of VHT.
The invention has the beneficial effects as follows: in the sending method of the radio frames that the present invention passes through and device, the number of the long training domain VHT-LTF of the VHT that can be supported by receiving terminal determines the maximum number of the VHT-LTF in the channel measurement frame sent, thus make the number of the VHT-LTF in channel measurement frame more reasonable, more can reflect the characteristic of receiving terminal.
In the sending method of radio frames of the present invention and device, channel measurement frame NDP is made up of long training sequence (L-STF), short training sequence (S-STF), signal domain (L-SIG), VHT signal A territory (VHT-SIG-A), VHT short training sequence (VHT-STF), at least two long training domains of VHT (VHT-LTF).Compared to prior art, the channel measurement frame in method and apparatus of the present invention has lacked VHT signal B territory (VHT-SIG-B), thus when measuring frame NDP to receiving terminal transmitting channel, reduces the pilot-frequency expense that transmitting channel measures frame NDP.
Accompanying drawing explanation
Fig. 1 be existing in the structure of channel measurement frame NDP;
Fig. 2 is the structure of the channel measurement frame NDP in one embodiment of the present invention.
Embodiment
By reference to the accompanying drawings the present invention is described in further detail below by embodiment.
As shown in Figure 1, the channel measurement frame NDP in agreement is made up of L-STF (long training sequence), S-STF (short training sequence), L-SIG (signal domain), VHT-SIG-A (VHT signal A territory), VHT-STF (VHT short training sequence), VHT-LTF (the long training domain of VHT) and VHT-SIG-B (VHT signal B territory).
For saving pilot-frequency expense, as shown in Figure 2, the invention provides a kind of sending method and device of radio frames, for measuring frame NDP to receiving terminal transmitting channel.In this sending method and device, have employed a kind of new channel measurement frame NDP frame structure.This channel measurement frame NDP is made up of long training sequence (L-STF), short training sequence (S-STF), signal domain (L-SIG), VHT signal A territory (VHT-SIG-A), VHT short training sequence (VHT-STF), at least two long training domains of VHT (VHT-LTF).
Can see, compared with prior art, a main difference is frame structure of the present invention: eliminate VHT-SIG-B (VHT signal B territory).Existing VHT-SIG-B (VHT signal B territory) comprises following four partial contents, respectively: Length (data length), MCS (the modulating-coding exponent numbers of data), Reserved (reservation bit) and Tail (tail bit).By the NDP in agreement, parameter vector table is sent for data length Length limit, send in parameter vector table at NDP and data length is defined as 0.
And for MCS (the modulating-coding exponent numbers of data), Reserved (reservation bit) and Tail (tail bit), the present invention is designed to indicate in VHT signal A territory.Following table is the content of VHT-SIG-A instruction:
As can be seen here, the content of VHT-SIG-B (VHT signal B territory) indicates in transmission parameter vector table TXVECTOR and VHT signal A territory.Thus in the present invention, the original function realizing VHT-SIG-B (VHT signal B territory) can be ensured, the pilot-frequency expense sent needed for NDP can be reduced again, thus when utilizing NDP of the present invention to carry out channel measurement, the transmission rate of data can be improved.
Though be existing in the structure of channel measurement frame NDP, or the structure of the channel measurement frame NDP proposed in the present invention, all has the long training domain of VHT (VHT-LTF).Sending method of the present invention and device, before transmitting channel measures frame NDP, also set the maximum number of the long training domain of VHT:
The maximum of the long training domain of VHT (VHT-LTF) number that the long training domain of VHT (VHT-LTF) the number determination channel measurement frame NDP that can support according at least one receiving terminal comprises.
Wherein, when only having a receiving terminal, maximum is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of this receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Such as, receiving terminal only has site STA 1, the number of transmit antennas of the feedback matrix of the areas of capacity instruction of site STA 1 is 4, and the maximum supported dimension of channel measurement of this website is 8, then the maximum of the number of VHT-LTF is provided with the little value between 4 or 8 or two.
When there being two or more receiving terminal, threshold value is the minimum value in the number of the VHT-LTF that each receiving terminal can be supported.For each receiving terminal, its VHT that can support long training domain VHT-LTF number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of described receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
Such as, receiving terminal is two websites, and be that STA1 and STA2, STA1 can support that the number of the VHT-LTF of the NDP simultaneously measured is that 4, STA2 can support that the VHT-LTF number of the NDP measured is 8 respectively, then the threshold value of the VHT-LTF of NDP is 4.
When receiving terminal has multiple, due to the maximum of VHT-LTF number in the channel measurement frame NDP that sends be the VHT-LTF that each receiving terminal can be supported number in the middle of minimum value.Namely the VHT-LTF number that there is not transmission exceedes the situation of the number of the VHT-LTF that certain receiving terminal can be supported.If do not arrange maximum number, the situation that may occur is the number of the VHT-LTF sent is 8, and the number of the VHT-LTF that certain receiving terminal can be supported only has 4, which results in the waste of transmission on the one hand, adds the expense of pilot tone.On the other hand, need extra algorithm to unnecessary 4 VHT-LTF process, thus add the complexity of sending method and device.
After above-mentioned threshold value is set, when being no more than described threshold value, it is identical with the Nsts indicated in VHT signal A territory (VHT-SI G-A) that the long training domain of VHT (VHT-LTF) number comprised in channel measurement frame NDP is set.
Above content is in conjunction with concrete execution mode further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. a sending method for radio frames, is characterized in that, comprises step: measure frame NDP to receiving terminal transmitting channel; Described channel measurement frame NDP comprises at least two long training domain VHT-LTF of VHT, and the number of the long training domain VHT-LTF of VHT that the maximum number of described VHT long training domain VHT-LTF can be supported according at least one receiving terminal is determined; When described receiving terminal is multiple, the maximum number of described VHT long training domain VHT-LTF is the minimum value in the number of the long training domain VHT-LTF of VHT that each receiving terminal can be supported.
2. the method for claim 1, it is characterized in that, when for a receiving terminal, described maximum number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of this receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
3. the method for claim 1, it is characterized in that, for each receiving terminal, the number of its VHT that can support long training domain VHT-LTF is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of described receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
4. the method as described in as arbitrary in claim 1-3, it is characterized in that, the number arranging the VHT long training domain VHT-LTF comprised in channel measurement frame NDP is identical with the Nsts indicated in VHT signal A territory VHT-SIG-A.
5. method as claimed any one in claims 1 to 3, it is characterized in that, described channel measurement frame NDP is made up of long training sequence L-STF, short training sequence S-STF, signal domain L-SIG, VHT signal A territory VHT-SIG-A, VHT short training sequence VHT-STF, at least two long training domain VHT-LTF of VHT.
6. a dispensing device for radio frames, is characterized in that, described dispensing device, for measuring frame NDP to receiving terminal transmitting channel; Described channel measurement frame NDP comprises at least two long training domain VHT-LTF of VHT, and the VHT long training domain VHT-LTF number that the maximum number of described VHT long training domain VHT-LTF can be supported according at least one receiving terminal is determined; When described receiving terminal is multiple, the maximum number of described VHT long training domain VHT-LTF is the minimum value in the number of the long training domain VHT-LTF of VHT that each receiving terminal can be supported.
7. device as claimed in claim 6, it is characterized in that, when for a receiving terminal, described maximum number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of this receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
8. device as claimed in claim 6, it is characterized in that, for each receiving terminal, its VHT that can support long training domain VHT-LTF number is the smaller value in the middle of the number of transmit antennas of feedback matrix of the areas of capacity instruction of described receiving terminal or the maximum supported dimension of channel measurement of receiving terminal or two.
9. the device as described in claim 6 to 8, it is characterized in that, described channel measurement frame NDP is made up of long training sequence L-STF, short training sequence S-STF, signal domain L-SIG, VHT signal A territory VHT-SIG-A, VHT short training sequence VHT-STF, at least two long training domain VHT-LTF of VHT.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110117423.8A CN102201891B (en) | 2011-05-03 | 2011-05-03 | Wireless frame transmission method and device |
| JP2014508677A JP5684947B2 (en) | 2011-05-03 | 2012-03-30 | Method and apparatus for transmitting wireless data packet |
| BR112013028267-3A BR112013028267B1 (en) | 2011-05-03 | 2012-03-30 | Method for transmitting a radio data packet and device for transmitting a radio data packet |
| KR1020137029478A KR101507676B1 (en) | 2011-05-03 | 2012-03-30 | Radio frame transmitting method and device |
| PCT/CN2012/073351 WO2012149847A1 (en) | 2011-05-03 | 2012-03-30 | Radio frame transmitting method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110117423.8A CN102201891B (en) | 2011-05-03 | 2011-05-03 | Wireless frame transmission method and device |
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| CN102201891A CN102201891A (en) | 2011-09-28 |
| CN102201891B true CN102201891B (en) | 2015-07-22 |
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| CN201110117423.8A Active CN102201891B (en) | 2011-05-03 | 2011-05-03 | Wireless frame transmission method and device |
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| JP (1) | JP5684947B2 (en) |
| KR (1) | KR101507676B1 (en) |
| CN (1) | CN102201891B (en) |
| BR (1) | BR112013028267B1 (en) |
| WO (1) | WO2012149847A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201891B (en) * | 2011-05-03 | 2015-07-22 | 中兴通讯股份有限公司 | Wireless frame transmission method and device |
| CN103001728B (en) * | 2011-09-14 | 2016-08-03 | 华为技术有限公司 | A kind of method and apparatus representing data length |
| CN103095426B (en) * | 2011-10-31 | 2015-06-03 | 华为技术有限公司 | Information channel measurement feedback requesting method, station device and service set system |
| CN103096341B (en) * | 2011-11-01 | 2016-05-25 | 华为技术有限公司 | The sending, receiving method of measurement data and website and system |
| CN103312466A (en) * | 2012-03-16 | 2013-09-18 | 中兴通讯股份有限公司 | Transmission method and receiving station for null feedback frame |
| CN109245808B (en) | 2013-06-25 | 2020-09-25 | 华为技术有限公司 | Uplink multi-user data transmission method and uplink multi-user input and output system |
| WO2015077223A1 (en) | 2013-11-19 | 2015-05-28 | Intel IP Corporation | Method, apparatus, and computer readable medium for multi-user scheduling in wireless local-area networks |
| US9325463B2 (en) * | 2013-11-19 | 2016-04-26 | Intel IP Corporation | High-efficiency WLAN (HEW) master station and methods to increase information bits for HEW communication |
| WO2016021838A1 (en) * | 2014-08-07 | 2016-02-11 | 엘지전자(주) | Method for transmitting frame in wireless communication system and device therefor |
| ES2793654T3 (en) * | 2014-08-21 | 2020-11-16 | Lg Electronics Inc | Method for uplink transmission in a wireless communication system and apparatus therefor |
| US9876552B2 (en) * | 2016-02-01 | 2018-01-23 | Qualcomm Incorporated | Beamforming techniques for single-stream communications |
| CN107645737B (en) * | 2016-07-21 | 2022-06-10 | 中兴通讯股份有限公司 | Channel measurement method, wireless communication device and equipment |
| WO2021114053A1 (en) * | 2019-12-09 | 2021-06-17 | 北京小米移动软件有限公司 | Transmission measurement method, transmission measurement device and storage medium |
| CN118101008A (en) * | 2022-11-25 | 2024-05-28 | 华为技术有限公司 | Channel detection method, device and communication system |
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- 2011-05-03 CN CN201110117423.8A patent/CN102201891B/en active Active
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- 2012-03-30 JP JP2014508677A patent/JP5684947B2/en active Active
- 2012-03-30 BR BR112013028267-3A patent/BR112013028267B1/en active IP Right Grant
- 2012-03-30 KR KR1020137029478A patent/KR101507676B1/en active Active
- 2012-03-30 WO PCT/CN2012/073351 patent/WO2012149847A1/en active Application Filing
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| CN101379726A (en) * | 2006-02-15 | 2009-03-04 | 三星电子株式会社 | Method and system for sounding packet exchange in wireless communication system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5684947B2 (en) | 2015-03-18 |
| WO2012149847A1 (en) | 2012-11-08 |
| KR20130143128A (en) | 2013-12-30 |
| CN102201891A (en) | 2011-09-28 |
| JP2014513486A (en) | 2014-05-29 |
| BR112013028267B1 (en) | 2022-05-03 |
| BR112013028267A2 (en) | 2017-04-25 |
| KR101507676B1 (en) | 2015-03-31 |
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