METHODS AND SYSTEMS FOR MAINTAINING SPECTRAL COMPATIBILITY BETWEEN CO-EXISTING LEGACY AND WIDEBAND DSL SERVICES
According to certain general aspects, the present invention relates to methods for transmitting signals on twisted wire-pairs above 30 MHz using frequency division duplexing (FDD) in support of 1 Gb/s aggregate services on short loop lengths while maintaining spectral compatibility with legacy ADSL2 (≦2.2 MHz bandwidth) and VDSL2 services (≦30 MHz bandwidth). An advantage of the FDD approach for Gb/s transmission according to the invention is spectral compatibility with legacy DSL services without the sacrifice of any capacity of the wider band.
1 . A method for simultaneously performing xDSL communications and wideband communications above 30 MHz, comprising:
configuring the wideband communications to use frequency division duplexing (FDD);
configuring the xDSL communications to use a first bandplan; and
configuring the wideband communications to use a second band plan that is spectrally compatible with the first bandplan.
2 . A method according to claim 1 , wherein the xDSL communications are ADSL2.
3 . A method according to claim 1 , wherein the xDSL communications are VDSL2.
4 . A method according to claim 1 , wherein the xDSL communications and the wideband communications are performed using lines in a common cable.
5 . A method according to claim 1 , wherein the wideband communications use a bandwidth of at least 106 MHz.
6 . A method according to claim 1 , further comprising configuring the wideband communications to perform digital duplexing to facilitate separation of upstream and downstream portions of the second band plan.
7 . A method according to claim 1 , further comprising configuring the wideband communications to use a frame structure that includes retransmission control information in each frame.
8 . A method according to claim 1 , further comprising configuring the wideband communications to use a separate latency path for retransmission control information.
9 . A system for simultaneously performing xDSL communications and wideband communications above 30 MHz, comprising:
a first transceiver that is configured to perform wideband communications using frequency division duplexing (FDD); and
a second transceiver that is configured to perform xDSL communications using a first bandplan,
wherein the first transceiver is further configured to use a second bandplan that is spectrally compatible with the first bandplan.
10 . A system according to claim 9 , wherein the xDSL communications are ADSL2.
11 . A system according to claim 9 , wherein the xDSL communications are VDSL2.
12 . A system according to claim 9 , wherein the first and second transceivers are both connected to lines in a common cable.
13 . A system according to claim 9 , wherein the wideband communications use a bandwidth of at least 106 MHz.
14 . A system according to claim 9 , wherein the first transceiver is further configured to perform digital duplexing to facilitate separation of upstream and downstream portions of the second bandplan.
15 . A system according to claim 9 , wherein the first transceiver is further configured to use a frame structure that includes retransmission control information in each frame.
16 . A system according to claim 9 , wherein the first transceiver is further configured to use a separate latency path for retransmission control information.
17 . A system for simultaneously performing xDSL communications and wideband communications above 30 MHz, comprising:
a first transceiver that is configured to perform wideband communications using time division duplexing (TDD) and a first bandplan;
a second transceiver that is configured to perform xDSL communications using frequency division duplexing (FDD) and a second bandplan; and
an Ethernet bonding module to combine data received by the first and second transceivers into a common Ethernet bit stream,
wherein the first bandplan is spectrally separate from the second bandplan.
18 . A system according to claim 17 , wherein the xDSL communications are ADSL2.
19 . A system according to claim 17 , wherein the xDSL communications are VDSL2.
20 . A system according to claim 17 , wherein the first and second transceivers are both connected to lines in a common cable.
21 . A system according to claim 17 , wherein the wideband communications use a bandwidth of at least 106 MHz.