CN1175831A - Method of detecting signal in wirelesss local area network - Google Patents
Method of detecting signal in wirelesss local area network Download PDFInfo
- Publication number
- CN1175831A CN1175831A CN97115282A CN97115282A CN1175831A CN 1175831 A CN1175831 A CN 1175831A CN 97115282 A CN97115282 A CN 97115282A CN 97115282 A CN97115282 A CN 97115282A CN 1175831 A CN1175831 A CN 1175831A
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- signal
- wireless channel
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- diffuse
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 abstract 4
- 238000007689 inspection Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0825—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a method for detecting whether other terminal devices are using a wireless channel by a terminal device used in wireless LAN in order to transmit detecting signal for data. The method includes the following steps: (1) comparing the reverse diffusion value of a signal provided from the wireless channel with a predetermined valve value having predetermined frequency again and again; (2) checking whether the frequency is larger than the fixed valve value exceed frequency when the reverse diffusion value of the signal is larger than the valve value in step (1); (3) determining that the signal of one of other terminal devices is in the wireless channel if the frequency is larger than the fixed valve value exceed frequency when the reverse diffusion value exceeds the valve value and; and (4) determining that the wireless channel has no signals of other terminal devices if the frequency is less than the fixed valve value exceed frequency when the reverse diffusion value exceeds the valve value.
Description
The present invention relates to a kind of WLAN (wireless local area network) (LAN), exactly, relate to a kind of method that detects the signal of other-end device, determine when wanting to send data whether the other-end device in WLAN (wireless local area network) uses this wireless channel with a convenient predetermined terminal device.
In general, be included in terminal installation in the WLAN when sending data when one by wireless channel, tackle it and check whether the other-end device has used this wireless channel, can successfully not send described data when not taken by the other-end device with this wireless channel of box lunch.This is used for checking whether the other-end device has used the rule of this wireless channel to make regulation in the IEEE801.11 standard.
Simultaneously, introduced a kind of random back (back-off) method, a kind of wireless channel access method of in the IEEE801.11 standard, stipulating.Be used for detecting at this wireless channel and whether exist the method for a signal to carry out by this way, promptly in case send that Frame is at first fixed a predetermined period of time and each time wireless channel being checked that a predetermined period of time passes.If do not detect signal, described fixedly predetermined period of time is reduced a predetermined period of time.If detect this signal, then fixedly predetermined period of time is held.By after having detected signal check in this wireless channel the other-end device having used this wireless channel, if described fixedly predetermined period of time is reduced to ＂ 0 ＂, then terminal installation is judged that this wireless channel is not taken by the other-end device and is sent Frame by this wireless channel.
As shown in Figure 1, be used for comprising: demodulation parts 11a and 11b at the signal supervisory instrument of wireless channel detection signal, sign indicating number diffuse in reverse direction (code reverse diffusing) parts 12a and 12b, average computation parts 13a and 13b, summation component 14 and control assembly 15.The signal r (t) that demodulation parts 11a and 11b demodulation apply from wireless channel and it is outputed to connected sign indicating number diffuse in reverse direction parts 12a and 12b.Sign indicating number diffuse in reverse direction parts 12a and 12b are diffused into pseudo noise (PN) value in the signal that connected demodulation parts 11a and 11b apply, and it is outputed to connected average computation parts 13a and 13b.In addition, the mean value of average computation parts 13a and the 13b signal that will apply from sign indicating number diffuse in reverse direction parts 12a and 12b outputs to summation component 14.This summation component 14 square asks average by the signal that provides from connected average computation parts 13a and 13b is asked, and this mean value is outputed to control assembly 15.The traffic operation of control assembly 15 these terminal installations of control.Whether the diffuse in reverse direction value that control assembly 15 is checked the signal that this applies from summation component 14 is greater than threshold value with determine whether to have signal in this wireless channel.If the diffuse in reverse direction value from the signal of summation component 14 is higher than this threshold value, determine that then signal is that vice versa in this wireless channel.
In other words, usually, in order to check whether other-end is using this wireless channel, and control assembly 15 checks whether the diffuse in reverse direction value of the signal that receives each time that passes at a predetermined period of time is higher than described threshold value, as shown in Figure 2.If this diffuse in reverse direction value is higher than described threshold value, then determine in this wireless channel to exist a signal, and if this diffuse in reverse direction value is lower than described threshold value, then determining does not have signal in this wireless channel.
In usual way, check in a predetermined period of time all signal in the wireless channel being existed each time of passing, the result, if because serious mistake makes a signal value be higher than described threshold value, if with because air interference or decline make the amplitude of this signal input become very little, mistake then takes place to judge probably.Because this judgement mistake makes and the existence that can not correctly determine signal in the wireless channel causes mistake thus in transfer of data.
Therefore, the invention provides a kind of in WLAN the method for detection signal, this method has eliminated because the limitation of correlation technique and one or more problems that defective causes.
The purpose of this invention is to provide a kind of when a predetermined terminal device is wanted in a WLAN to send data the correct other-end device that detects whether in the method for using a wireless channel.
Other characteristics of the present invention and advantage will describe in detail in the following description, and wherein part characteristic and advantage will be significantly in description, maybe can obtain by implementing the present invention.Purpose of the present invention and other advantages will realize by the structure that particularly points out in specification and claims and accompanying drawing and obtain.
As embodiment and general description, in order to realize these and other advantages and, whether to use a wireless channel by inspection other-end device so that the method for the detection signal of transmission data may further comprise the steps by a terminal installation that in WLAN, uses according to purpose of the present invention:
(1) repeatedly relatively with the diffuse in reverse direction value of a signal that provides from wireless channel and a predetermined threshold by a preset frequency;
(2) when surpassing described threshold value, the diffuse in reverse direction value of this signal in step (1) checks that whether described frequency is greater than the fixed threshold overfrequency;
(3) if in step (2) when this diffuse in reverse direction value surpasses described threshold value described frequency judge then that greater than the fixed threshold overfrequency signal of an other-end device is present in this wireless channel; With
(4) if in step (2) when this diffuse in reverse direction value surpasses described threshold value described frequency then judge the signal that in this wireless channel, does not have the other-end device less than the fixed threshold overfrequency.
Will be appreciated that, above total description and following detailed all be exemplary and illustrative, its objective is that the invention of wanting to provide to limiting as claim describes.
The accompanying drawing that is used to provide further understanding of the invention and constitutes a specification part shows embodiments of the invention, and itself and text description one are used from principle of the present invention is made an explanation.
In the accompanying drawing:
Fig. 1 is the block diagram of a signal supervisory instrument in WLAN;
Fig. 2 is the flow chart of the common signal detection step in WLAN of expression;
Fig. 3 is the flow chart of expression according to the signal detection step in WLAN of the present invention.
Below with reference to the accompanying drawings the preferred embodiments of the present invention are described in detail.
The present invention constitutes in the following manner.In order to send data, when a terminal installation is checked the other-end device whether when using a wireless channel, this terminal installation a predetermined period of time pass each time repeatedly with the signal value of this wireless channel and a threshold ratio.When this signal value during, then judge in this wireless channel, to have a signal greater than this threshold value.By this method, the existence to signal in this wireless channel detects.Operation of the present invention is carried out by the signal supervisory instrument of Fig. 1.
The order that Fig. 3 is pressed in input operation of the present invention is carried out.
In step 31, control assembly 15 is fixed a threshold value overfrequency N and and is checked that frequency M is ＂ 0 ＂, in step 32, a signal that provides by summation component 14 is provided and in step 33, checks whether the diffuse in reverse direction value of this corresponding signal input surpasses described threshold value.In case this diffuse in reverse direction value surpasses described threshold value, in step 34, control assembly 15 makes threshold value overfrequency N add ＂ 1 ＂, makes in step 35 and checks that frequency M adds ＂ 1 ＂ and checks in step 36 whether this inspection frequency M surpasses fixing in advance inspection frequency T1.If be that then control assembly 15 does not turn back to step 32 and repeats aforesaid operations.If for being, in step 37, control assembly 15 checks whether this threshold value overfrequency N surpasses fixing in advance threshold value overfrequency T2.If for being, control assembly 15 judges that the signal of an other-end device is present in this wireless channel in step 38 in step 37.If be not, control assembly 15 is judged the signal that does not have the other-end device in this wireless channel in step 39.In case the input of the signal value of step 33 does not surpass described threshold value, the then operation of control assembly 15 execution in step 35.Step 32 to 35 operation repeats a scheduled time.In this scheduled time, control assembly 15 compares the predetermined threshold of diffuse in reverse direction value and wireless channel signal repeatedly by described fixedly inspection frequency T1.If frequency N is then judged in this wireless channel to have signal greater than fixed threshold overfrequency T2 when the diffuse in reverse direction value of this signal surpasses described threshold value.
As mentioned above, in case the present invention checks sending Frame that to the existence of signal in wireless channel the present invention is just comparing signal value and this predetermined threshold of this wireless channel repeatedly each time that a predetermined period of time passes.If described frequency is greater than described fixing frequency when the signal value of this wireless channel surpasses this threshold value, then device is determined to have signal in this wireless channel, if even so that because serious mistake or because thereby air interference or decline make the amplitude of this signal input become very little has caused providing when surpassing the signal of this threshold value, the present invention also can correctly judge the existence of signal in wireless channel, and mistake can not occur judging.
Those skilled in the art will be appreciated that, can to of the present invention in WLAN (wireless local area network) the method for input make various improvement and variation, and do not break away from the spirit or scope of the present invention.Therefore, the present invention will cover of the present invention various improvement and variation and their equivalent that comprises within the scope of the appended claims.
Claims (1)
1. a terminal installation that uses in WLAN is by checking whether the other-end device is using a wireless channel so that the method for the detection signal of transmission data may further comprise the steps:
(1) repeatedly relatively with the diffuse in reverse direction value of a signal that provides from wireless channel and a predetermined threshold by a preset frequency;
(2) when surpassing described threshold value, the diffuse in reverse direction value of this signal in step (1) checks that whether described frequency is greater than the fixed threshold overfrequency;
(3) if in step (2) when this diffuse in reverse direction value surpasses described threshold value described frequency judge then that greater than the fixed threshold overfrequency signal of an other-end device is present in this wireless channel; With
(4) if in step (2) when this diffuse in reverse direction value surpasses described threshold value described frequency then judge the signal that in this wireless channel, does not have the other-end device less than the fixed threshold overfrequency.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR36446/96 | 1996-08-29 | ||
| KR36446/1996 | 1996-08-29 | ||
| KR1019960036446A KR100192207B1 (en) | 1996-08-29 | 1996-08-29 | Signal sensing method in wireless lan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1175831A true CN1175831A (en) | 1998-03-11 |
| CN1144413C CN1144413C (en) | 2004-03-31 |
Family
ID=19471432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971152829A Expired - Lifetime CN1144413C (en) | 1996-08-29 | 1997-08-29 | Method of detecting signal in wirelesss local area network |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100192207B1 (en) |
| CN (1) | CN1144413C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355298C (en) * | 1998-09-07 | 2007-12-12 | 松下电器产业株式会社 | Communication terminal apparatus, base station communication apparatus and radio communication method |
| CN100456764C (en) * | 2002-04-25 | 2009-01-28 | 国际商业机器公司 | Dynamic reconfiguration of encryption upon detection of intrusion |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100374028B1 (en) * | 1999-09-06 | 2003-02-26 | 삼성전자주식회사 | Apparatus and method for detecting a received on-off keying signal in a cdma mobile communication system |
-
1996
- 1996-08-29 KR KR1019960036446A patent/KR100192207B1/en not_active IP Right Cessation
-
1997
- 1997-08-29 CN CNB971152829A patent/CN1144413C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100355298C (en) * | 1998-09-07 | 2007-12-12 | 松下电器产业株式会社 | Communication terminal apparatus, base station communication apparatus and radio communication method |
| CN100456764C (en) * | 2002-04-25 | 2009-01-28 | 国际商业机器公司 | Dynamic reconfiguration of encryption upon detection of intrusion |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100192207B1 (en) | 1999-06-15 |
| KR19980016759A (en) | 1998-06-05 |
| CN1144413C (en) | 2004-03-31 |
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