CN201290125Y - WLAN system in hollowness circumstance - Google Patents

Abstract

The utility model discloses a WLAN system in clear environment, comprising AP devices collocated in high density and a plurality of terminals, wherein the AP devices collocated in high density cover the terminals from the top down. The WLAN system in clear environment of the utility model effectively, by an installation manner that the AP devices collocated in high density cover the terminals from the top down, avoids same frequency interference, resolves high-density telephone traffic problem of WLAN system, and enhances network experience degree of users.

Description

Wlan system under the spacious environment

Technical field

The utility model relates to a kind of WLAN technology, relates in particular to wlan system under a kind of spacious environment.

Background technology

At present, the WLAN technology has become the widely used technological means of high-speed wideband wireless data service, be usually used in environment such as airport, hotel, office building, campus, under this conventional environment, the WLAN signal can effectively be isolated by physical means such as bodies of wall, user distribution density is less and the user data coincidence is little, so user's experience of can being surfed the Net preferably.Yet, under spacious environment, user's closeness height, the scene that coincidence is big, as stadiums, large-scale meeting-place etc., existing frequency can not satisfy business need.Therefore, the density that necessary increasing access points (Access Point is called for short AP) lays is with the raising throughput, but the co-channel interference of this moment is very obvious, how to suppress co-channel interference, and reducing collision domain is the key of raising throughput of system.

In the prior art, wlan system substantially all is an omnidirectional antenna of selecting 360 degree, and coverage is bigger, and co-channel interference is wayward.And the AP device substantially all is installed in positions such as ceiling, conduit and pillar top in the wlan system of the prior art, with the general distance of terminal at several meters, tens meters, or even tens of meters scope.As shown in Figure 1, usually AP1 is placed on roof 4, above terminal 2, covers terminal 2 from top to bottom.Like this, AP1 is far away from terminal 2 distance, and coverage is bigger, makes the homogenous frequency signal serious interference, and because ground in the face of the reflection that antenna transmits, has more increased the weight of interference between signals.

The utility model content

The purpose of this utility model is, at the serious defective of wlan system co-channel interference in the prior art, provides wlan system under a kind of spacious environment of effective minimizing co-channel interference.

Wlan system comprises under this spaciousness environment: the AP device that high density lays and a plurality of terminal, the AP device that high density lays covers terminal from the bottom to top.

Preferably, the AP device that high density lays comprises directed little gain antenna, is used for sending signal to terminal.

More preferably, the half-power angle of directed little gain antenna is 40～60 degree.The gain of directed little gain antenna is 2～8dB.

Wlan system under the spacious environment of the present utility model, the AP device that lays by high density covers the mounting means of terminal from the bottom to top, has effectively avoided co-channel interference, has solved the highdensity traffic problem of wlan system, has improved user's online Experience Degree.

Description of drawings

Fig. 1 is a wlan system structural representation in the prior art;

Fig. 2 is a wlan system structural representation under the spacious environment of the present utility model.

Embodiment

Below in conjunction with accompanying drawing utility model is elaborated.

As shown in Figure 2, wlan system comprises AP device AP1 and a plurality of terminal 2 that high density lays under the spacious environment among the utility model embodiment, and AP1 covers terminal 2 from the bottom to top.

The AP device AP1 that high density in the present embodiment lays comprises directed little gain antenna, is used for sending signal to terminal 2; AP1 is placed on the ground 5, covers the terminal 2 that places on the desktop 3 from the bottom to top.

In the present embodiment, compared with prior art, cover terminal 2 from the bottom to top, shortened the distance between antenna and the terminal, and under the spacious environment, the coverage mode interference that can effectively avoid signal reflex and caused from the bottom to top by making AP1.The AP of present embodiment lays mode, has reduced the co-channel interference between the AP, has improved user's online Experience Degree.

Preferably, the half-power angle 6 of the directed little gain antenna in the present embodiment is 40～60 degree, and gain is 2～8dB.

Relation between the gain of antenna, half-power angle and the size is specifically by following formulate:

$G=10\×\lg (\mathrm{\η}\·4\mathrm{\πS}/{\mathrm{\λ}}^2)=10\×\lg \frac{C}{\mathrm{\θH}\·\mathrm{\θV}}.$

Wherein, G is the gain of antenna; η is an antenna actinal surface utilization ratio, is generally 0.65～0.85, and limiting value is 1; θ H is horizontal half-power angle; θ V is vertical half-power angle; λ is the wavelength of radiated wave; C is a constant, gets 28000～33000; S is the antenna aperture area, and S=L * W, W are antenna width in the horizontal direction, and L is the length of antenna in vertical direction;

θ H=K * (λ/W), θ V=K * (λ/L), K is a constant, gets 51 approximately;

From above-mentioned formula as can be seen, horizontal/vertical half-power angle and the size relation of being inversely proportional to, that is: vertical half-power angle is more little, and it is high more to gain, and the length of antenna is long more; Horizontal half-power angle is more little, and it is high more to gain, and the width of antenna is wide more.

If make half-power angle as far as possible little, then antenna gain and physical size are inevitable bigger, cause equivalent radiation (or reception) power to become big because antenna gain is crossed conference, have strengthened interference.Can not use larger-size antenna under this scene simultaneously.Therefore, must be according to the optimal balance point between specific requirement choose reasonable half-power angle, gain and the size under the special scenes.

In high density service application environment,, select half-power angle 6, and antenna gain is that the directed little gain antenna of 2～8dB is more excellent scheme at 40～60 degree by after the test comparison to various variety classeses, specification antenna.

Wlan system under the spacious environment of the present utility model, by being installed in the terminal below to the choose reasonable of antenna and with AP, overcome the problem of co-channel interference under the present insoluble high density scene preferably, improved the Experience Degree of the multi-medium data business under the scenes such as the large-scale game that WLAN uses, large-scale exhibition.

It should be noted that at last: above embodiment only in order to the explanation the utility model and and the described technical scheme of unrestricted the utility model; Therefore, although this specification has been described in detail the utility model with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model; And all do not break away from the technical scheme and the improvement thereof of spirit and scope of the present utility model, and it all should be encompassed in the claim scope of the present utility model.

Claims (4)

1, wlan system under a kind of spacious environment is characterized in that, comprising: the AP device that high density lays and a plurality of terminal, the AP device that described high density lays covers described terminal from the bottom to top.

2, wlan system under the spacious environment according to claim 1 is characterized in that, the AP device that described high density lays comprises directed little gain antenna, is used for sending signal to terminal.

3, wlan system under the spacious environment according to claim 2 is characterized in that, the half-power angle of the little gain antenna of described orientation is 40～60 degree.

4, according to wlan system under claim 2 or the 3 described spacious environment, it is characterized in that the gain of the little gain antenna of described orientation is 2～8dB.

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