Co-phasing of transmissions from multiple infrastructure nodes

Patent metadata

Field	Value
Publication number	US-9559884-B2
Application number	US-201113995158-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Feb 7, 2011
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

Briefly, in accordance with one or more embodiments, mobile station or user equipment receives pilot signals from two or more infrastructure nodes in a distributed antenna system, and calculates phase or timing information, or combinations thereof, from the pilot signals. The mobile station feeds back the phase or timing information, or combinations thereof, to the infrastructure nodes, and then receives one or more subsequent transmissions from the infrastructure nodes with phase shift or timing adjustments, or combinations thereof, calculated by the infrastructure nodes and applied to the spatial streams transmitted by the infrastructure nodes.

First claim

What is claimed is:

1. A method to be executed by an infrastructure node, comprising:
receiving one or more sounding signals transmitted to the infrastructure node from a remote station transmitting the sounding signals;
exchanging timing information of the one or more sounding signals between the infrastructure node and one or more other infrastructure nodes;
comparing phases or times of arrival, or combinations thereof, of the sounding signals on the infrastructure node and the one or more other infrastructure nodes;
calculating phase adjustments or timing adjustments, or combinations thereof, to apply to spatial streams for the infrastructure node; and
applying intra-node phase or timing adjustments, or inter-node phase or timing adjustments, or combinations thereof, during one or more transmissions from the infrastructure node to the remote station, wherein said applying comprises:
calculating adjustments for a first group of subcarriers;
extrapolating the calculated adjustments for a second group of subcarriers; and
applying a phase adjustment or a timing adjustment, or combinations thereof, to the first group of subcarriers based on the calculated adjustments and to the second group of subcarriers based on the extrapolated adjustments according to a function of frequency, wherein the function is a linear function, a non-linear function, a filter function, or combinations thereof.

2. A method as claimed in claim 1 , wherein said comparing comprises exchanging timing related information between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes.

3. A method as claimed in claim 1 , wherein said comparing comprises performing synchronization between the infrastructure node and the one or more other infrastructure nodes.

4. A method as claimed in claim 1 , wherein said calculating comprises exchanging service information between the infrastructure node and the one or more other infrastructure nodes, or between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes, or combinations thereof.

5. An infrastructure node comprising processing circuitry to:
receive one or more sounding signals transmitted to the infrastructure node from a remote station transmitting the sounding signals;
exchange timing information of the one or more sounding signals between the infrastructure node and one or more other infrastructure nodes;
compare phases or times of arrival, or combinations thereof, of the sounding signals on the infrastructure node and the one or more other infrastructure nodes;
calculate phase adjustments or timing adjustments, or combinations thereof, to apply to spatial streams for the infrastructure node; and
apply intra-node phase or timing adjustments, or inter-node phase or timing adjustments, or combinations thereof, during one or more transmissions from the infrastructure node to the remote station, wherein the function is a linear function, a non-linear function, a filter function, or combinations thereof;
wherein the processing circuitry is configured to:
calculate adjustments for a first group of subcarriers,
extrapolate the calculated adjustments for a second group of subcarriers, and
apply a phase adjustment or a timing adjustment, or combinations thereof, the first group of subcarriers based on the calculated adjustments and to the second group of subcarriers based on the extrapolated adjustments.

6. An infrastructure node as claimed in claim 5 , wherein the infrastructure node comprises processing circuitry to exchange timing related information between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes.

7. An infrastructure node as claimed in claim 5 , wherein the infrastructure node comprises processing circuitry to perform synchronization between the infrastructure node and the one or more other infrastructure nodes.

8. An infrastructure node as claimed in claim 5 , wherein the infrastructure node comprises processing circuitry to exchange service information between the infrastructure node and the one or more other infrastructure nodes, or between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes, or combinations thereof.

9. An infrastructure node as claimed in claim 5 , wherein the infrastructure node comprises processing circuitry to apply a phase adjustment or a timing adjustment, or combinations thereof, to one or more subcarriers according to a function of frequency.

10. An article of manufacture comprising a non-transitory storage medium having instructions stored thereon that, if executed by a processor of an infrastructure node, result in:
receiving one or more sounding signals transmitted to the infrastructure node from a remote station transmitting the sounding signals;
exchanging timing information of the one or more sounding signals between the infrastructure node and one or more other infrastructure nodes;
comparing phases or times of arrival, or combinations thereof, of the sounding signals on the infrastructure node and the one or more other infrastructure nodes;
calculating phase adjustments or timing adjustments, or combinations thereof, to apply to spatial streams for the infrastructure node; and
applying intra-node phase or timing adjustments, or inter-node phase or timing adjustments, or combinations thereof, during one or more transmissions from the infrastructure node to the remote station, wherein the function is a linear function, a non-linear function, a filter function, or combinations thereof;
wherein said applying comprises:
calculating adjustments for a first group of subcarriers;
extrapolating the calculated adjustments for a second group of subcarriers; and
applying a phase adjustment or a timing adjustment, or combinations thereof, to the first group of subcarriers based on the calculated adjustments and to the second group of subcarriers based on the extrapolated adjustments.

11. An article of manufacture as claimed in claim 10 , wherein said comparing comprises exchanging timing related information between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes.

12. An article of manufacture as claimed in claim 10 , wherein said comparing comprises performing synchronization between the infrastructure node and the one or more other infrastructure nodes.

13. An article of manufacture as claimed in claim 10 , wherein said calculating comprises exchanging service information between the infrastructure node and the one or more other infrastructure nodes, or between an adjustment processor and the infrastructure node and the one or more other infrastructure nodes, or combinations thereof.

14. An article of manufacture as claimed in claim 10 , wherein the instructions, if executed, further result in applying a phase adjustment or a timing adjustment, or combinations thereof, to one or more subcarriers according to a function of frequency.

Assignees

• Davydov Alexei Vladimirovich
• Maltsev Alexander Alexandrovich
• Morozov Gregory Vladimirovich
• Sergeyev Vadim S
• Zhu Yuan
• Etemad Kamran
• Yang Xiangying
• Zhang Yujian
• Intel Corp

Inventors

• Davydov Alexei Vladimirovich
• Maltsev Alexander Alexandrovich
• Morozov Gregory Vladimirovich
• Sergeyev Vadim S
• Zhu Yuan
• Etemad Kamran
• Yang Xiangying
• Zhang Yujian

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L27/26 Primary

  Systems using multi-frequency codes (H04L27/32 takes precedence) · CPC title

• H04B7/0456

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04W56/0045

  compensating for timing error by altering transmission time · CPC title