CN101778444A - Device and method for choosing transmission path in wireless network - Google Patents
Device and method for choosing transmission path in wireless network Download PDFInfo
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- CN101778444A CN101778444A CN200910002502A CN200910002502A CN101778444A CN 101778444 A CN101778444 A CN 101778444A CN 200910002502 A CN200910002502 A CN 200910002502A CN 200910002502 A CN200910002502 A CN 200910002502A CN 101778444 A CN101778444 A CN 101778444A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to a device for choosing a transmission path in a wireless network, comprising a radio frequency module, a fundamental frequency module and a control module. The radio frequency module is coupled with multiple antennas and is used for processing packets respectively received by the antennas. The fundamental frequency module generates signal strength corresponding to the antennas according to the packets received by each antenna. The control module is coupled with the fundamental frequency module for receiving signal strength and respectively controls the antennas to be either enabled or disabled according to signal strength difference.
Description
Technical field
The present invention is relevant a kind of wireless network, selection of transmission paths apparatus and method in particularly a kind of wireless network.
Background technology
In wireless network (wireless network) system, have many dual-mode antennas and can bring many benefits, for example: increase to receive stability, promote data throughout (throughput, TP) etc.Therefore, (multi-input multi-output, MIMO) technology extensively applies in the Radio Network System the multiple input and output formed of many antennas.
Under multiple input and output mechanism, have easily between the many dual-mode antennas each other signal strength signal intensity (signalstrength, SS) the excessive situation of difference produces, for example:
First example, in wireless network, because signal is to transmit in air, therefore the transmission of signal is subjected to the influence of radio channel easily, for example: multi-path (multipath), decay (fading), mobile (mobility) etc., all may cause the many received signal strength signal intensities of dual-mode antenna to have difference each other.
Second example, the condition of Anneta module itself is promptly inequality, uses different antennas as different RX path, and causes the yield value of antenna itself promptly to have difference.Some manufacturer is based on cost consideration, transmission (Transmitter will be had simultaneously, TX) with reception (receiver, RX) Antenna Design of function is for adopting the bigger antenna of gain (for example: dipole antenna), have only the antenna of receiving function (for example: printed antenna) then to use the less antenna of gain merely.Yet the gain of dipole antenna is bigger, and the gain of printed antenna is less, and this is the characteristic of antenna itself.Moreover the outer member on the path that possible each root antenna is formed is different, as: resistance, inductance or derailing switch etc., all will cause the characteristic of antenna itself inequality, promptly the signal strength signal intensity between the antenna is with different.
Signal strength signal intensity difference between antenna (for example: difference is excessive) not only can't obtain the benefit that many antennas bring, also can be because of the signal strength signal intensity of certain root antenna is low excessively, and influence the receiving ability of other antenna, and then cause whole data throughout to reduce.So, need a kind of transmission path to do suitable control to multiple input and output, begin to allow the MIMO wireless network reach its advantage (for example: increase reception stability, promote data throughout).
Summary of the invention
In view of this, the present invention proposes selection of transmission paths apparatus and method in a kind of wireless network.By device proposed by the invention or method, but automatic detection signal intensity is also suitably adjusted route, in order in the wireless network environment that adopts multiple input and output mechanism, can reach the optimized purpose of data transmission efficiency.
The present invention proposes selection of transmission paths device in a kind of wireless network, comprises: radio-frequency module, fundamental module and control module.Radio-frequency module couples a plurality of antennas, in order to handle the antenna institute package of reception respectively.Fundamental module is respectively according to the package that each antenna received, and generation is corresponding to the signal strength signal intensity of antenna.Control module couples fundamental module, in order to received signal intensity, and the difference of basis signal intensity, with control antenna respectively be activation and forbidden energy one of them.
The present invention also proposes selection of transmission paths device in a kind of wireless network, comprises: radio-frequency module, fundamental module and control module.Radio-frequency module couples a plurality of antennas, in order to handle the antenna institute package of reception respectively.Fundamental module is respectively according to the package that each antenna received, and generation is corresponding to the signal strength signal intensity of antenna.Control module couples fundamental module, in order to received signal intensity, and according to preset rules and signal strength signal intensity, with control antenna respectively be activation and forbidden energy one of them.
The present invention also proposes selection of transmission paths method in a kind of wireless network, comprises the following step: provide a plurality of antennas, and antenna receives package respectively; Respectively according to the package that antenna received, and produce signal strength signal intensity corresponding to antenna; The difference of basis signal intensity, with control antenna respectively be activation and forbidden energy one of them.
Relevant preferred embodiment of the present invention and effect thereof, cooperate now graphic explanation as after.
Description of drawings
Fig. 1 is the first embodiment schematic diagram of selection of transmission paths device in the wireless network.
Fig. 2 is the second embodiment schematic diagram of selection of transmission paths device in the wireless network.
Fig. 3 is the flow chart of selection of transmission paths method in the wireless network.
[main element label declaration]
10: radio-frequency module
11,12,13,14: antenna
20: fundamental module
30: control module
32: medium access control layer
Embodiment
Please refer to " Fig. 1 ", this figure is depicted as the first embodiment schematic diagram of selection of transmission paths device in the wireless network.Selection of transmission paths device proposed by the invention comprises: radio-frequency module 10, fundamental module 20 and control module 30.
Radio frequency (radio frequency, RF) module 10 couples a plurality of antennas, have four antennas 11～14 shown in " Fig. 1 ", and each antenna receives a package (packet) respectively, and wherein the quantity of antenna can be set on demand, not as limit.Fundamental frequency (base band, BB) module 20 is separated the package that each antenna 11～14 of modulation (de-modulation) is received respectively, and produce signal strength signal intensity corresponding to each antenna 11～14 (signa lstrength, SS).
Please refer to " Fig. 2 " second embodiment schematic diagram for selection of transmission paths device in the wireless network.In second embodiment, control module 30 can comprise medium access control (media access control, MAC) layer 32.Whether whether medium access control layer 32 is judged this package by medium access address (MAC address) and is sent by correct source, and be the package that will send the selection of transmission paths device really to.If, can be according to the pairing signal strength signal intensity of this package, and decision to receive the antenna of this package be activation or forbidden energy.By also finding out among the figure when producing activation/disable signal when control module 30 basis signal intensity, can earlier activation/disable signal be sent to fundamental module 20, by fundamental module 20 activation/disable signal is sent to radio-frequency module 10 again, therefore each antenna 11～14 in the radio-frequency module 10 can be received corresponding activation/disable signal, and determines that each antenna is activation or forbidden energy.
Selection of transmission paths device proposed by the invention can be applicable to platform (STA) in the wireless network environment or access point (access point, AP).In addition, device proposed by the invention can be applicable to receiving terminal (receiver, RX) or the transmission end (Transmitter, TX).
In addition, control module 30 also can comprise Drive Layer (driver), and this Drive Layer is in order to drive the mechanism of selection of transmission paths device.
Under explanation basis signal intensity, and control the activation/disabled state of each antenna.According to the computing of Boltzmann's constant and consider the thermal noise factors such as (thermal noise) of general element, generally in Radio Network System, signal strength signal intensity is when-70dBm, resulting signal noise ratio (signal to noiseratio, SNR) be about 30dB, and big more input signal can obtain high more signal noise ratio, and for example :-50dBm can obtain the signal noise ratio of 50dB approximately;-40dBm can obtain the signal noise ratio of 60dB approximately.Yet, the technology of making and element characteristic with present integrated circuit (IC), the signal noise ratio that common radio frequency IC can provide is about 30dB, and the signal that baseband circuit received is because of process antenna and radio frequency IC, therefore signal noise ratio can be limited by the radio frequency IC of front end, that is is about 30dB.
The signal strength signal intensity that general control module 30 is received can be done the expression of percentage with the absolute signal intensity of antenna end, as :-100dBm～0dBm can be expressed as 0%～100%, so when the signal noise ratio demand of fundamental module 20 is during greater than 30dB, the absolute signal intensity of expression antenna end need be greater than-70dBm, that is need be greater than 30%.
One embodiment, can adopt 30dB (if represent can be 30% with percentage, certainly, different designs according to the designer also can adopt other numerical value) as first threshold value, when that is to say that signal strength signal intensity when some antennas is less than first threshold value, whether just can consider needs with this antenna forbidden energy, to avoid having influence on the performance usefulness of other antenna.In addition, explanation is with present MIMO Radio Network System earlier, and the number of reception antenna need could correctly be separated transmission signals more than or equal to the number of spatial signal streams (spatial stream) and be read out.That is to say that if the other side transmits a spacing wave, then the minimum needs of the antenna of receiving terminal (RX) are one; In like manner, if the other side transmits two spacing waves, two antennas of then minimum needs, by that analogy.
Illustrate, is example with " Fig. 1 " with " Fig. 2 ", the number of hypothesis space signal flow is two, and radio-frequency module 10 has four antennas 11～14, its signal strength signal intensity is respectively-70dBm ,-60dBm ,-30dBm ,-45dBm, represent promptly to be respectively 30%, 40%, 70%, 55% with percentage.Because the signal strength signal intensity of each antenna is all greater than first threshold value (30%), therefore four antennas 11～14 are all activation, and are no problem with two spatial signal streams of four antenna transmission.
Same situation is supposed this moment four antennas 11～14 because distance becomes far away, and is caused the decay of 20dB, make its signal strength signal intensity become respectively-90dBm ,-80dBm ,-50dBm ,-65dBm, represent promptly to be respectively 10%, 20%, 50%, 35% with percentage.At this moment, antenna 11 has been lower than first threshold value (30%) with the signal strength signal intensity of antenna 12, if will antenna 11 information that received with antenna 12 bring the performance that utilization can reduce whole wireless network on the contrary (for example: the ability of antenna 13 and antenna 14 received signals), so should consider whether with antenna 11 and antenna 12 forbidden energy.
Because the signal strength signal intensity when many factors all can change the antenna reception in wireless network environment, therefore in order to reach dynamic control antenna, control module 30 can be upgraded the signal strength signal intensity of each antenna 11～14 in one period scheduled time of every interval in promptly by fundamental module 20, can dynamic control antenna be activation or forbidden energy so.
In the forbidden energy antenna, the numerical value of the maximum in control module 30 record signal strength signal intensities this moment, and the numerical value of the maximum in the signal strength signal intensity added the 3rd threshold value and produce activation threshold value corresponding to this forbidden energy antenna.Wherein, the activation threshold value is that this forbidden energy antenna can be replied a referential data into enabled status.In this, the purpose that adds one the 3rd threshold value is for avoiding the disturbance of signal strength signal intensity, gets back to forbidden energy again easily after causing antenna to be enabled, and causes online instability.Therefore, add the 3rd threshold value be for etc. signal strength signal intensity when strong, just allow antenna answer activation.So the 3rd threshold value can be different by the difference of user's demand.
The one section preset time in control module 30 every intervals just can upgrade the signal strength signal intensity of the antenna that belongs to enabled status afterwards, when the signal strength signal intensity of activation antenna more than or equal to originally by the activation threshold value of forbidden energy antenna, can allow this antenna activation again.
Illustrate as followsly, suppose that number of antennas is depicted as four as " Fig. 1 " or " Fig. 2 ", and the number of spatial signal streams is two.In addition, suppose that first threshold value is that 30%, second threshold value is 18%, and the 3rd threshold value is 5%.Originally, the percentage of the signal strength signal intensity of four antennas 11～14 is respectively: 60%, 55%, 32%, 29%.The signal strength signal intensity 29% of antenna 14 is less than first threshold value 30% at this moment, and in four antennas in the signal strength signal intensity the maximum be 60% of antenna 11, therefore to deduct the difference of signal strength signal intensity 29% gained of antenna 14 be 31% to the signal strength signal intensity 60% of antenna 11, greater than second threshold value 18%.Therefore,, and note the activation threshold value of antenna 14, that is 60% add the 3rd threshold value 5%, so antenna 14 pairing activation threshold values are 65% with antenna 14 forbidden energy.
When signal strength signal intensity dies down or environment changes to some extent, the signal strength signal intensity of the antenna 11～13 that obtain this moment is respectively 53%, 56%, 29% (because antenna 14 is by forbidden energy, so there is not signal strength signal intensity).Control module 30 finds that the signal strength signal intensity of antennas 13 is 29% less than first threshold value 30%, and signal strength signal intensity the maximum is 56% of an antenna 12 in this moment three antennas, therefore to deduct the difference of signal strength signal intensity 29% gained of antenna 13 be 27% to the signal strength signal intensity 56% of antenna 12, greater than 18% of second threshold value.Therefore,, and note the activation threshold value of antenna 13, that is 56% add the 3rd threshold value 5%, so antenna 13 pairing activation threshold values are 61% with antenna 13 forbidden energy.
Only surplus at present two transmission paths are the transmission path that antenna 11 and antenna 12 are constituted.When signal gos up gradually, make the signal strength signal intensity that obtains antenna 11 and antenna 12 become 61%, 59%.At this moment, can find still to be in that signal strength signal intensity the maximum is 61% of an antenna 11 in the antenna of enabled status, just equal antenna 13 pairing activation threshold values 61%, therefore with antenna 13 activations.
At this moment, three antenna activations have been arranged, supposed that signal continues to go up to make the signal strength signal intensity of antenna 11～13 become 64%, 65%, 33%.Can find that signal strength signal intensity the maximum is 65% of an antenna 12 in the antenna of enabled status, just equal antenna 14 pairing activation threshold values 65%, therefore with antenna 14 activations.Wherein, the activation threshold value can be by experiment, learn an appropriate value in fact, and the activation threshold value can be fixing default value.
Please refer to " Fig. 3 ", this figure is depicted as the flow chart of selection of transmission paths method in the wireless network, comprises the following step.
Step S10: a plurality of antennas are provided, and each antenna receives package respectively.
Step S20: respectively according to the package that each antenna received, and generation is corresponding to the signal strength signal intensity of each antenna.
Step S30: the difference of basis signal intensity, with control respectively each antenna be activation and forbidden energy one of them.
Except that above-mentioned steps, can comprise the following step: whenever one period scheduled time of interval, upgrade the signal strength signal intensity of each antenna, and then dynamic control antenna.
The number of control antenna activation is more than or equal to the number of spatial signal streams.The comparison signal intensity and first threshold value; When the signal strength signal intensity of this antenna less than first threshold value, the signal strength signal intensity of the maximum and this antenna in the subtracted signal intensity and produce difference; Compare the difference and second threshold value; When difference greater than second threshold value, this antenna of forbidden energy then.That is to say that when the maximum difference of signal strength signal intensity during greater than second threshold value, then disable signal intensity is less than the antenna of first threshold value.Wherein, first threshold value can be 30dB.
The maximum in signal strength signal intensity during this antenna of record forbidden energy; The maximum in the signal strength signal intensity is added the 3rd threshold value, and produce activation threshold value corresponding to this antenna.That is to say, the maximum signal in the basis signal intensity, and produce the activation threshold value.Whenever one period scheduled time of interval, upgrade the signal strength signal intensity of the antenna of activation; When the signal strength signal intensity of the antenna of the activation activation threshold value more than or equal to this antenna, then activation is originally by this antenna of forbidden energy.
Though technology contents of the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; do not breaking away from spirit of the present invention a little change and the retouching done; all should be covered by in the category of the present invention, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (15)
1. selection of transmission paths device in the wireless network comprises:
Radio-frequency module couples a plurality of antennas, in order to handle these a plurality of antennas the package that receives respectively;
Fundamental module, respectively according to these a plurality of packages that this a plurality of antenna received, and generation is corresponding to a plurality of signal strength signal intensities of these a plurality of antennas; And
Control module couples this fundamental module, in order to receiving this a plurality of signal strength signal intensities, and according to the difference of these a plurality of signal strength signal intensities, with control respectively these a plurality of antennas be activation and forbidden energy one of them.
2. device according to claim 1, wherein every interval scheduled time, this control module is according to these a plurality of signal strength signal intensities of upgrading, in order to these a plurality of antennas of control.
3. device according to claim 1, wherein when the maximum difference of these a plurality of signal strength signal intensities during greater than second threshold value, then this signal strength signal intensity of forbidden energy is less than the antenna of first threshold value.
4. device according to claim 3, wherein this first threshold value is 30dB.
5. device according to claim 3, wherein this control module is according to the maximum signal in this a plurality of signal strength signal intensities, and generation activation threshold value.
6. device according to claim 5, wherein when this signal strength signal intensity of this antenna of activation more than or equal to this activation threshold value, then be enabled by this antenna of forbidden energy.
7. device according to claim 1, wherein this control module is in order to foundation preset rules and this a plurality of signal strength signal intensities, with control respectively these a plurality of antennas be activation and forbidden energy one of them.
8. selection of transmission paths method in the wireless network comprises the following step:
A plurality of antennas are provided, and these a plurality of antennas receive package respectively;
Respectively according to these a plurality of packages that this a plurality of antenna received, and generation is corresponding to a plurality of signal strength signal intensities of these a plurality of antennas; And
According to the difference of this a plurality of signal strength signal intensities, with control respectively these a plurality of antennas be activation and forbidden energy one of them.
9. method according to claim 8 also comprises the following step:
Whenever the interval scheduled time, upgrade this a plurality of signal strength signal intensities, in order to these a plurality of antennas of control.
10. method according to claim 8, wherein the number that is enabled of these a plurality of antennas is more than or equal to the number of spatial signal streams.
11. method according to claim 8 also comprises the following step:
Relatively these a plurality of signal strength signal intensities and first threshold value;
When this signal strength signal intensity of this antenna less than this first threshold value, subtract each other this signal strength signal intensity of the maximum and this antenna in these a plurality of signal strength signal intensities and produce difference;
Relatively this difference and second threshold value; And
When this difference greater than this second threshold value, this antenna of forbidden energy then.
12. method according to claim 11 also comprises the following step:
The maximum in these a plurality of signal strength signal intensities during this antenna of record forbidden energy; And
The maximum adds the 3rd threshold value in should a plurality of signal strength signal intensities, and produces the activation threshold value corresponding to this antenna.
13. method according to claim 8 also comprises the following step:
When the maximum difference of these a plurality of signal strength signal intensities during greater than second threshold value, then this signal strength signal intensity of forbidden energy is less than the antenna of first threshold value.
14. method according to claim 13 also comprises the following step:
According to the maximum signal in these a plurality of signal strength signal intensities, and produce the activation threshold value.
15. method according to claim 14 also comprises the following step:
When this signal strength signal intensity of this antenna of activation more than or equal to this activation threshold value, then be enabled by this antenna of forbidden energy.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178868A (en) * | 2011-12-21 | 2013-06-26 | 神讯电脑(昆山)有限公司 | Radio-frequency transmission circuit, electronic device thereof and method for saving power |
| WO2013159554A1 (en) * | 2012-04-28 | 2013-10-31 | 华为终端有限公司 | Method and device for improving communication rate |
| EP2641296A4 (en) * | 2010-11-19 | 2015-03-04 | Qualcomm Inc | Systems and methods for compensating antenna gain imbalance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9702370L (en) * | 1997-06-19 | 1998-12-20 | Ericsson Telefon Ab L M | Balanced diversity |
| US7103382B2 (en) * | 2001-07-10 | 2006-09-05 | Kyocera Wireless Corp. | System and method for receiving and transmitting information in a multipath environment |
| US20070066244A1 (en) * | 2005-09-19 | 2007-03-22 | Via Technologies Inc. | Method and system for assigning a receiving antenna |
| CN101291478A (en) * | 2007-04-17 | 2008-10-22 | 宏碁股份有限公司 | Device and method for saving energy consumption in multitask input-output system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2641296A4 (en) * | 2010-11-19 | 2015-03-04 | Qualcomm Inc | Systems and methods for compensating antenna gain imbalance |
| CN103178868A (en) * | 2011-12-21 | 2013-06-26 | 神讯电脑(昆山)有限公司 | Radio-frequency transmission circuit, electronic device thereof and method for saving power |
| WO2013159554A1 (en) * | 2012-04-28 | 2013-10-31 | 华为终端有限公司 | Method and device for improving communication rate |
| US8964915B2 (en) | 2012-04-28 | 2015-02-24 | Huawei Device Co., Ltd. | Method and apparatus for improving communication rate |
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