Roaming method based on MESH WIFI, electronic device and computer program product
View Patent ↗A roaming method based on MESH WIFI executable by an electronic device, comprising: calculating noise values and interference coefficients of a primary access point (AP) and surrounding APs, adjusting power values between the primary AP and the surrounding APs based on the noise values and the interference coefficients according to normalization, and, when a target AP from the surrounding APs reaches a preset condition, switching the client to connect to the target AP.
1. A roaming method based on MESH WIFI executable by a client, comprising:
by using a multiple access point (multi-AP) agent, monitoring a primary access point (AP) connected by the client in real-time and calculating noise values between the primary AP and surrounding APs according to mutual interference characteristics of the APs using formula (1) represented as:
Noise
fromotherAPs
=
RCPI
Client
-
uplink
-
AP
CINR
Client
;
(
1
)
by using the multi-AP agent, substituting the noise values of the primary AP and the surrounding APs into formula (2) to determine whether the formula (2) is qualified, wherein the formula (2) is represented as:
∫
x
n
(
Noise
fromotherAPs
)
dt
_
<
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
,
(
2
)
where x and n represent individual times;
by using the multi-AP agent, calculating interference coefficients Wt(W 1 ,W 2 ) between the primary AP and the surrounding APs, where W 1 indicates a leakage ratio calculated according to a center frequency of the primary AP, W 2 indicates an interference source power calculated based on the RCPI values, and W(total)=(the interference source power)×(the leakage ratio);
by using the multi-AP agent, adjusting power values between the primary AP and the surrounding APs according to normalization;
by using the multi-AP agent, determining whether at least one target AP calculated using formula (3) is qualified, wherein the formula (3) is represented as:
∫
x
n
(
Noise
fromotherAPs
)
dt
_
>
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
;
(
3
)
by using the multi-AP agent, if a target AP calculated using formula (3) is qualified, sending a notification to a multi-AP controller, and
by using the multi-AP controller, switching the client to connect to the target AP.
2. The method of claim 1 , further comprising:
by using the multi-AP agent, if more than one target APs calculated using the formula (3) are qualified, calculating the noise values of the target APs using formula (4) represented as:
Noise
fromotherAPs
=
∫
x
n
(
Noise
fromotherAPs
)
dt
_
-
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
;
(
4
)
and
by using the multi-AP controller, switching the client to connect to the target AP with the maximum noise value.
3. The method of claim 1 , wherein the step of adjusting the power values between the primary AP and the surrounding APs according to the normalization further comprises:
by using the multi-AP agent, defining maximum adjustable ranges of the powers for the surrounding APs;
by using the multi-AP agent, providing a maximum adjustable range of the power to the surrounding APs based on a user distribution status of a basic service area (BSS) to obtain {(ΔP MAX,1 ), (ΔP MAX,2 ), . . . , (ΔP MAX,n )};
by using the multi-AP agent, discovering a reference AP to be served as the normalization base to obtain Min{ΔP MAX,1 ·W t,1 , ΔP MAX,2 ·W t,2 , . . . , ΔP MAX,n ·W t,n }; and
by using the multi-AP agent, defining the adjusted power values of the surrounding APs if the reference AP is the i-th AP to obtain
Δ
P
adjusted
,
k
=
Δ
P
MAX
,
i
·
W
t
,
i
W
t
,
k
.
4. The method of claim 1 , further comprising:
by using the multi-AP agent, if the formula (2) is not qualified, the process proceeds to block S 1 , repeating the step of calculating the noise values between the primary AP and the surrounding APs.
5. A roaming system based on MESH WIFI, comprising:
a client;
a multi-AP agent, configured to:
monitor a primary access point (AP) connected by a client in real-time and calculate noise values between the primary AP and surrounding APs according to mutual interference characteristics of the APs using formula (1) represented as:
Noise
fromotherAPs
=
RCPI
Client
-
uplink
-
AP
CINR
Client
;
(
1
)
substitute the noise values of the primary AP and the surrounding APs into formula (2) to determine whether the formula (2) is qualified, wherein the formula (2) is represented as:
∫
x
n
(
Noise
fromotherAPs
)
dt
_
<
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
,
(
2
)
where x and n represent individual times;
calculate interference coefficients Wt(W 1 ,W 2 ) between the primary AP and the surrounding APs, where W 1 indicates a leakage ratio calculated according to a center frequency of the primary AP, W 2 indicates an interference source power calculated based on the RCPI values, and W(total)=(the interference source power)×(the leakage ratio);
adjust power values between the primary AP and the surrounding APs according to normalization; and
determine whether at least one target AP calculated using formula (3) is qualified, wherein the formula (3) is represented as:
∫
x
n
(
Noise
fromotherAPs
)
dt
_
>
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
;
(
3
)
and
send a notification if a target AP calculated using formula (3) is qualified; and
a multi-AP controller switch, configured to receive the notification and switch the client to connect to the target AP according to the notification.
6. The system of claim 5 , wherein:
the multi-AP agent is further configured to, if more than one target APs calculated using the formula (3) are qualified, calculate the noise values of the target APs using formula (4) represented as:
Noise
fromotherAPs
=
∫
x
n
(
Noise
fromotherAPs
)
dt
_
-
∫
x
n
+
k
(
Noise
fromotherAPs
)
dt
_
;
(
4
)
and
the multi-AP controller is further configured to switch the client to connect to the target AP with the maximum noise value.
7. The system of claim 5 , wherein:
the multi-AP agent is further configured to define maximum adjustable ranges of the powers for the surrounding APs, provide a maximum adjustable range of the power to the surrounding APs based on a user distribution status of a basic service area (BSS) to obtain {(ΔP MAX,1 ), (ΔP MAX,2 ) , . . . , (ΔP MAX,n )}, discover a reference AP to be served as the normalization base to obtain Min{ΔP MAX,1 ·W t,1 , ΔP MAX,2 ·W t,2 , . . . , ΔP MAX,n ·W t,n }, and define the adjusted power values of the surrounding APs if the reference AP is the i-th AP to obtain
Δ
P
adjusted
,
k
=
Δ
P
MAX
,
i
·
W
t
,
i
W
t
,
k
.
8. The system of claim 5 , wherein the multi-AP agent is further configured to, if the formula (2) is not qualified, repeat the step of calculating the noise values between the primary AP and the surrounding APs.