Bandwidth management for DSL modem pool

• US 6,744,811 B1
• Filed: 06/12/2000
• Issued: 06/01/2004
• Est. Priority Date: 06/12/2000
• Status: Active Grant

• Current Assignee: Actelis Networks, Inc.
• Original Assignee: Actelis Networks, Inc.
• Inventors: Kantschuk, Amir
• Primary Examiner(s): Tran, Khai
• Application Number:
  US09/591,488
• Time in Patent Office: 1,450 Days
• Field of Search: 375/222, 375/225, 375/224, 379/93.01, 379/27
• US Class Current: 375/222
• CPC Class Codes: H04L 12/5602 Bandwidth control in ATM Networks, e.g. leaky bucket

Abstract

A method for managing the bandwidth of a modem pool having at least two co-interfering modems, the method including measuring an SNR margin for at least two of the co-interfering modems, and adjusting the bit rate of each of the co-interfering modems such that the SNR margin of each of the co-interfering modems is between a first and a second predetermined threshold.

Claims

1. A method for managing a bandwidth of a modem pool having at least two co-interfering modems, the method comprising:

measuring an SNR margin for at least two of said co-interfering modems; and

adjusting a bit rate of each of said co-interfering modems such that SNR margin of each of said co-interfering modems is between a first and a second predetermined threshold wherein said adjusting step comprises adjusting the bit rate B of a modem i according to the formula $B_i^{\left(n+1\right)}=B_i^{\left(n\right)}+\left(B_i^{\left(n\right)}·<br><br>\frac{M_i^{\left(n\right)}}{{\mathrm{SNR}}_{\mathrm{ref}}}\right)+w_i^{\left(n\right)}$

wherein;

M_i is the SNR margin of the modem i being adjusted,

SNR_ref is the SNR that corresponds to a maximum BER, and w_i is uniformly distributed noise over [−

r/2, r/2] where r is a minimum bit rate increment.

2. A method according to claim 1 wherein said at least two co-interfering modems use different modulation schemes, wherein said SNR_ref differs for each of said co-interfering modems, and wherein each SNR_ref corresponds to one of said modulation schemes.

3. Apparatus for managing a bandwidth of a modem pool having at least two co-interfering modems comprising:

means for measuring an SNR margin for at least two of said co-interfering modems; and

means for adjusting a bit rate of each of said co-interfering modems such that SNR margin of each of said co-interfering modems is between a first and a second predetermined threshold wherein said means for adjusting is operative to adjust the bit rate B of a modem i according to the formula $B_i^{\left(n+1\right)}=B_i^{\left(n\right)}+\left(B_i^{\left(n\right)}·<br><br>\frac{M_i^{\left(n\right)}}{{\mathrm{SNR}}_{\mathrm{ref}}}\right)+w_l^{\left(n\right)}$

wherein;

M_i is the SNR margin of the modem i being adjusted,

SNR_ref is the SNR that corresponds to a maximum BER, and w_i is uniformly distributed noise over [−

r/2, r/2] where r is a minimum bit rate increment.

4. Apparatus according to claim 3 wherein said at least two co-interfering modems use different modulation schemes, wherein said SNR_ref differs for each of said co-interfering modems, and wherein each SNR_ref corresponds to one of said modulation schemes.