System and method for controlling dynamic transmit power in a mesh network
A system and method for controlling dynamic transmit power in a mesh network are disclosed. Distributed power transmit management methodology that implements transmission power management based on a comparison of signal to noise ratios from received beacon packets is used on a peer-to-peer basis. Embodiments work to keep all nodes accessible, dynamically adaptable to constant changes in the network, maximize frequency reuse, and reduce power requirements to maximize network performance while minimizing interference.
1. A method for controlling dynamic transmit power in a mesh network, the mesh network comprising a plurality of nodes, the method comprising:
(a) receiving a packet at a receiver of a first one of the nodes, the received packet sent from a transmitter of a second one of the nodes;
(b) determining whether the received packet is a beacon packet;
(c) determining a signal-to-noise ratio (SNR) of the received packet, when the received packet is determined to be a beacon packet;
(d) comparing the SNR to a predetermined range;
(e) determining whether the SNR falls within or outside the predetermined range based on the SNR comparison;
(f) determining, by the receiver, a transmit power level adjustment value, when the SNR is determined to fall outside the predetermined range;
(g) sending, via the receiver, the transmit power level adjustment value to the transmitter; and
(h) adjusting, at the transmitter, a transmit power level based on the transmit power level adjustment value, wherein the adjusted transmit power level is used by the transmitter for transmitting non-beacon packets;
wherein the SNR is a current SNR and is added to a previous SNR exponential moving average based on a previous SNR to create a current SNR exponential moving average, and wherein the SNR comparison utilizes the current SNR exponential moving average;
wherein a process implemented in the mesh network utilizes a low SNR limit, a high SNR limit, and either:
a change in SNR (ASNR) from the previous SNR to the current SNR; or
both the previous SNR and the current SNR; and
wherein the process implemented in the mesh network is utilized in determining the transmit power level adjustment value.
2. The method of claim 1 , further comprising determining a frequency band to be used by the transmitter for transmitting the non-beacon packet, wherein determining the frequency band is based on at least one criteria selected from a group consisting of the adjusted transmit power level, the transmit power level adjustment value, the SNR comparison, and combinations thereof.
3. The method of claim 1 , wherein at least one of steps (b)-(e) is performed by the receiver.
4. The method of claim 1 , wherein the beacon packet is transmitted at full power.
5. The method of claim 1 , further comprising providing an SNR report based on the current SNR to the process implemented in the mesh network when the ΔSNR from the previous SNR to the current SNR is greater than or equal to a decibel threshold.
6. A system that controls dynamic transmit power in a mesh network, the mesh network comprising a plurality of nodes, the system comprising:
a receiver of a first one of the nodes;
a transmitter of a second one of the nodes;
a processor configured for:
(a) receiving a packet at the receiver, the received packet sent from the transmitter;
(b) determining whether the received packet is a beacon packet;
(c) determining a signal-to-noise ratio (SNR) of the received packet, when the received packet is determined to be a beacon packet;
(d) comparing the SNR to a predetermined range;
(e) determining whether the SNR falls within or outside the predetermined range based on the SNR comparison;
(f) determining, by the receiver, a transmit power level adjustment value, when the SNR is determined to fall outside the predetermined range;
(g) sending, via the receiver, the transmit power level adjustment value to the transmitter; and
(h) adjusting, at the transmitter, a transmit power level based on the transmit power level adjustment value, wherein the adjusted transmit power level is used by the transmitter for transmitting non-beacon packets;
wherein the SNR is a current SNR and is added to a previous SNR exponential moving average based on a previous SNR to create a current SNR exponential moving average, and wherein the SNR comparison utilizes the current SNR exponential moving average;
wherein the processor is further configured for implementing a process in the mesh network that utilizes a low SNR limit, a high SNR limit, and either:
a change in SNR (ΔSNR) from the previous SNR to the current SNR; or
both the previous SNR and the current SNR; and
wherein the process implemented in the mesh network is utilized in determining the transmit power level adjustment value.
7. The system of claim 6 , wherein the processor is further configured for determining a frequency band to be used by the transmitter for transmitting the non-beacon packet, wherein determining the frequency band is based on at least one criteria selected from a group consisting of the adjusted transmit power level, the transmit power level adjustment value, the SNR comparison, and combinations thereof.
8. The system of claim 6 , wherein at least one of steps (b)-(e) is performed by the receiver.
9. The system of claim 6 , wherein the beacon packet is transmitted at full power.
10. The system of claim 6 , wherein the processor is further configured for providing an SNR report based on the current SNR to the process implemented in the mesh network when the ΔSNR from the previous SNR to the current SNR is greater than or equal to a decibel threshold.