Mobile backhaul topology planning and/or optimization
View Patent ↗A method implemented in a network controller used in a mobile backhaul (MBH) network is disclosed. The method includes receiving one or more physical layer parameters from MBH transceivers in the MBH network, computing an admissible set of rate matrices, computing a capacity region based on the admissible set of rate matrices, deciding MBH transmission topology, and transmitting the decision to the MBH transceivers. Other apparatuses, systems, and methods also are disclosed.
1. A method implemented in a network controller used in a mobile backhaul (MBH) network, the method comprising: receiving one or more physical layer parameters from MBH transceivers in the MBH network; computing an admissible set of rate matrices; computing a capacity region based on the admissible set of rate matrices; deciding MBH transmission topology; and transmitting the decision to the MBH transceivers, wherein rate matrix entry r ij , which denote a data rate between source node i and destination node j, is expressed as a function of signal-to-noise ratio (SNR) ξ ij on a source-destination link:
r ij =f (ξ ij ),
wherein the SNR is calculated according to a formula that can be expressed as
ξ
ij
=
G
ij
P
η
W
(
2
π
)
2
θ
ij
θ
ji
(
d
0
d
ij
)
α
for direction radio frequency (RF) or free-space optical transmission,
where η denotes an Additive White Gaussian Noise (AWGN) power spectral density, W is a bandwidth, P is transmitted power, θ ij is a one-dimensional beam width of a signal, d ij is a Euclidean distance between source node i and destination node j, d 0 is a reference distance based on which an effect of path loss parameter α is computed, and channel gain coefficient G ij accounts for a fading or shadowing effect.
2. The method as in claim 1 , wherein said one or more physical layer parameters include at least one of a signal-to-noise ratio (SNR), an optical SNR, a transceiver technology type, a transmission protocol, and a traffic load.
3. The method as in claim 1 , further comprising:
pruning the admissible set of rate matrices to account for a physical-layer constraint or a computation complexity limitation.
4. The method as in claim 1 , wherein the MBH transmission topology is decided by minimizing
∑
i
=
1
N
x
i
(
C
)
subject
to
R
=
∑
i
=
1
N
x
i
R
i
,
where R i denotes an admissible rate matrix, {R i }={R 1 , . . . , R i , . . . , R N } is a set of admissible rate matrices, R is a rate matrix of a time-division schedule, and x i is a coefficient for R i to solve an optimization problem expressed as (C).
5. The method as in claim 1 , wherein r ij is obtained as a maximum data rate that satisfies a given bit error rate (BER) requirement under a selected coding or modulation scheme for given SNR □ ij .
6. The method as in claim 5 , wherein the given SNR is computed from at least one of adopted coding, adopted modulation, and a signal and noise power parameter.
7. The method as in claim 1 , wherein the function can be expressed as f=(ξ ij )=W ij log 2 (1+ξ ij ), where W ij is a physical bandwidth of the source-destination link.
8. The method as in claim 1 , wherein the SNR for an optical fiber link (optical SNR, OSNR) is calculated according to a formula that can be expressed as
O
S
N
R
ij
=
ρ
R
s
2
B
ref
ξ
ij
,
where ρ=1, 2 for single-polarization and polarization-multiplexed optical signals, respectively, R s is a symbol rate, and B ref is a reference bandwidth for OSNR measurement.
9. The method as in claim 1 , wherein the decision is transmitted to the MBH transceivers via OpenFlow control messaging.
10. A network controller used in a mobile backhaul (MBH) network, the network controller comprising: a reception means for receiving one or more physical layer parameters from MBH transceivers in the MBH network; a first computing means for computing an admissible set of rate matrices; a second computing means for computing a capacity region based on the admissible set of rate matrices; a decision means for deciding MBH transmission topology; and a transmission means for transmitting the decision to the MBH transceivers, wherein rate matrix entry r ij , which denote a data rate between source node i and destination node j, is expressed as a function of signal-to-noise ratio SNR ξ ij on a source-destination link:
r ij =f (ξ ij ),
wherein the SNR is calculated according to a formula that can be expressed as
ξ
ij
=
G
ij
P
η
W
(
2
π
)
2
θ
ij
θ
ji
(
d
0
d
ij
)
α
for direction radio frequency (RF) or free-space optical transmission,
where η denotes an Additive White Gaussian Noise (AWGN) power spectral density, W is a bandwidth P is transmitted power, θ ij is a one-dimensional beam width of a signal, d ij is a Euclidean distance between source node i and destination node j, d 0 is a reference distance based on which an effect of path loss parameter α is computed, and channel gain coefficient G ij accounts for a fading or shadowing effect.
11. A mobile backhaul (MBH) network comprising: a network controller; MBH transceivers connected to the network controller, wherein the network controller receives one or more physical layer parameters from the MBH transceivers in the MBH network, computes an admissible set of rate matrices, computes a capacity region based on the admissible set of rate matrices, decides MBH transmission topology, and transmits the decision to the MBH transceivers, wherein rate matrix entry r ij , which denote a data rate between source node i and destination node j, is expressed as a function of signal-to-noise ratio SNR on a source-destination link:
r ij =f (ξ ij ),
wherein the SNR is calculated according to a formula that can be expressed as
ξ
ij
=
G
ij
P
η
W
(
2
π
)
2
θ
ij
θ
ji
(
d
0
d
ij
)
α
for direction radio frequency (RF) or free-space optical transmission,
where η denotes an Additive White Gaussian Noise (AWGN) power spectral density, W is a bandwidth, P is transmitted power, θ ij is a one-dimensional beam width of a signal, d ij is a Euclidean distance between source node i and destination node j, d 0 is a reference distance based on which an effect of path loss parameter α is computed, and channel gain coefficient G ij accounts for a fading or shadowing effect.