Method and apparatus for data allocation in an overlap-enabled communication system

• US 7,830,855 B2
• Filed: 10/04/2004
• Issued: 11/09/2010
• Est. Priority Date: 08/23/1999
• Status: Expired due to Fees

• Current Assignee: Apple Inc.
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Levin, Howard E., Molnar, Peter R., Gleason, Jeffrey P., Cavanaugh, Kenneth J.
• Primary Examiner(s): Tran; Phuc H
• Application Number:
  US10/958,039
• Publication Number:
  US 20050058115A1
• Time in Patent Office: 2,227 Days
• Field of Search: 370/319, 370/344
• US Class Current: 370/344
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence

Abstract

A communication system is dynamically configured to use some or all of the communication channel bandwidth. Regions of the communication channel are prioritized, and bandwidth is allocated in accordance with priorities and requested data rate.

Claims

1. In a communication system, a remote terminal comprising:

a transceiver for communicating with a communication channel; and

a system controller coupled to the transceiver for controlling the transceiver, the transceiver using geographic location of circuits connected to the communication channel to configure data transmission along the communication channel in one of a first mode wherein upstream data transmission and downstream data transmission are sent in substantially non-overlapping frequency domains, and a second mode wherein upstream data transmission and downstream data transmission are sent in substantially overlapping frequency domains, the communication channel communicating data via a plurality of frequency bins wherein the bins are segmented into a plurality of groups, the groups being selectively prioritized so that bins associated with the first mode are utilized before the bins associated with the second mode.

2. In the communication system of claim 1 wherein the first mode is a frequency division multiplexed mode (FDM) that uses at least one filter and the second mode is an echo cancellation mode that uses echo cancellation processing.

3. In the communication system of claim 1, the transceiver also using a data capacity of the communication channel to configure data transmission along the communication channel in one of the first mode or the second mode.

4. In the communication system of claim 1, the transceiver also using a noise level of the communication channel to configure data transmission along the communication channel in one of the first mode or the second mode.

5. The communication system of claim 1 wherein the communication channel communicates discrete multi-tone (DMT) data.

6. The communication system of claim 1 wherein the communication channel is processed occasionally during transmission to determine if the first and second modes should be changed between one another over time.

7. The communication system of claim 1 wherein prioritization of the groups is determined by one of:

(1) a fixed prioritization;

(2) another transceiver via a message;

or (3) a user of the communication system.

8. The communication system of claim 1 wherein higher-frequency non-overlapped bins are used first, followed by overlapped frequency bins that accommodate both upstream and downstream data, followed by frequency bins that accommodate plain old telephone service (POTS) information.

9. The communication system of claim 1, wherein the transceiver configures the communication channel in the first mode for transmission in a frequency division multiplex manner, detects changing line conditions of the communication channel, reconfigures the communication channel in the second mode for transmission in an echo cancellation manner, and continues to communicate data for the transmission in the echo cancellation manner.

10. The communication system of claim 9 wherein the changing line conditions progress to a point where the transceiver reconfigures the communication channel to use POTS frequency spectrum to communicate data for the transmission.

11. An apparatus comprising:

a processing unit, the processing unit determining a channel characteristic of a communication channel for communicating data via a plurality of frequency bins wherein the frequency bins are segmented into a plurality of groups, the groups being prioritized between predetermined frequency regions so that frequency bins associated with a first frequency region are used before frequency bins associated with a second frequency region, the channel characteristic being a geographic location of circuits connected to the communication channel;

a filter responsive to the processing unit; and

a line driver in communication with the communication channel;

wherein the filter and the line driver are dynamically configured by the processing unit to communicate over a particular set of frequency regions of the communication channel in response to the channel characteristic determined by the processing unit.

12. The apparatus of claim 11, wherein the characteristic is also a channel length and the processor configures the filter and line driver to communicate in a non-overlapped region of the channel and where the filter and line driver are dynamically configured in response to input from an external source, the external source including user input and a far end transceiver message.

13. The apparatus of claim 11, wherein the characteristic is also a channel length and the processor configures the filter and line driver to communicate in an overlapped region or a plain old telephone service region of the channel.