Method and apparatus for sending SELT measurement signal, and control device

Patent metadata

Field	Value
Publication number	US-9634721-B2
Application number	US-201514692420-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Oct 23, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Embodiments of the present invention relate to a method and an apparatus for sending a single-ended loop testing SELT measurement signal, and a control device. The method for sending a SELT measurement signal includes: aligning a synchronization symbol of a digital subscriber line on which a SELT diagnosis needs to be performed with a synchronization symbol of at least one DSL line for data transmission, where the synchronization symbol of the digital subscriber line on which a SELT diagnosis needs to be performed and the synchronization symbol of the at least one digital subscriber line for data transmission are uplink or downlink synchronization symbols; and carrying a SELT measurement signal over the aligned synchronization symbol of the DSL line on which a SELT diagnosis needs to be performed, where the SELT measurement signal is used to detect transmission quality or a line fault of the DSL line.

First claim

What is claimed is:

1. A method for sending a single-ended loop testing (SELT) measurement signal, comprising:
aligning a synchronization symbol of a digital subscriber line on which a SELT diagnosis needs to be performed with a synchronization symbol of at least one digital subscriber line for data transmission, wherein the synchronization symbol of the digital subscriber line on which a SELT diagnosis needs to be performed and the synchronization symbol of the at least one digital subscriber line for data transmission are uplink or downlink synchronization symbols;
detecting whether a condition of carrying the SELT measurement signal is met; and
carrying, when the detecting detects that the condition of carrying the SELT measurement signal is met, the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed, until all SELT measurement signals are carried and sent,
wherein the SELT measurement signal is used to detect transmission quality or a line fault of the digital subscriber line.

2. The method according to claim 1 , wherein the SELT measurement signal is orthogonal to a signal carried over the aligned synchronization symbol of the at least one digital subscriber line for data transmission.

3. The method according to claim 2 , wherein the signal carried over the aligned synchronization symbol of the at least one digital subscriber line for data transmission comprises a training signal, wherein the training signal is used to eliminate crosstalk on the digital subscriber line.

4. The method according to claim 1 , wherein the carrying the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed comprises:
carrying the SELT measurement signal over some subcarriers of the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed.

5. The method according to claim 4 , wherein the some subcarriers are selected continuously or periodically.

6. The method according to claim 1 , wherein:
the detecting whether the condition of carrying the SELT measurement signal is met comprises:
detecting whether the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission is orthogonal to the SELT measurement signal; and

the carrying comprises:
when the detecting detects that the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission is not orthogonal to the SELT measurement signal, interrupting carrying and sending the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed; and
when the detecting detects that the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission is orthogonal to the SELT measurement signal, carrying and sending the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed, until all SELT measurement signals are carried and sent.

7. The method according to claim 1 , wherein:
the detecting whether the condition of carrying the SELT measurement signal is met comprises:
detecting whether the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission and the SELT measurement signal are carried and sent over different subcarriers, and

the carrying comprises:
when the detecting detects that the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission and the SELT measurement signal are carried and sent over a same subcarrier, interrupting carrying and sending the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed; and
when the detecting detects that the signal carried over the synchronization symbol of the at least one digital subscriber line for data transmission and the SELT measurement signal are carried and sent over different subcarriers, carrying the SELT measurement signal over the aligned synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed, until all SELT measurement signals are carried and sent.

8. The method according to claim 1 , wherein:
the detecting whether the condition of carrying the SELT measurement signal is met comprises:
detecting whether a downlink synchronization symbol of the digital subscriber line on which a SELT diagnosis needs to be performed and a downlink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex downlink timeslot; and

the carrying comprises:
when the detecting detects that the downlink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed and the downlink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex uplink timeslot, interrupting carrying and sending the SELT measurement signal over the aligned downlink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed; and
when the detecting detects that the downlink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed and the downlink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex downlink timeslot, carrying the SELT measurement signal over the aligned downlink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed, until all SELT measurement signals are carried and sent.

9. The method according to claim 1 , wherein:
the detecting whether the condition of carrying the SELT measurement signal is met comprises:
detecting whether an uplink synchronization symbol of the digital subscriber line on which a SELT diagnosis needs to be performed and an uplink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex uplink timeslot; and

the carrying comprises:
when the detecting detects that the uplink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed and the uplink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex downlink timeslot, interrupting carrying and sending the SELT measurement signal over the aligned uplink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed; and
when the detecting detects that the uplink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed and the uplink synchronization symbol of the at least one digital subscriber line for data transmission are in a time division duplex uplink timeslot, carrying the SELT measurement signal over the aligned uplink synchronization symbol of the digital subscriber line on which the SELT diagnosis needs to be performed, until all SELT measurement signals are carried and sent.

10. An apparatus for sending a single-ended loop testing (SELT) measurement signal, comprising:
a memory storing instructions; and
at least one processor connected to the memory, the at least one processor configured to, including configured by the instructions, to:
align a synchron

Assignees

• Huawei Tech Co Ltd

Inventors

• Tu Jianping

Classifications

• H04L43/0876

  Network utilisation, e.g. volume of load or congestion level · CPC title

• H04B3/32 Primary

  Reducing cross-talk, e.g. by compensating · CPC title

• H04L41/0677

  Localisation of faults · CPC title

• H04B3/487

  Testing crosstalk effects · CPC title

• H04M3/306

  for frequencies above the voice frequency, e.g. xDSL line qualification (test methods, test equipment and test arrangements for subscriber lines using xDSL modems H04M3/304; systems modifying transmission characteristics according to link quality H04L1/0001; monitoring and/or testing of line transmission systems H04B3/46) · CPC title