METHODS AND APPARATUS FOR COORDINATION OF SENDING REFERENCE SIGNALS FROM MULTIPLE CELLS

• US 20130303157A1
• Filed: 07/16/2013
• Published: 11/14/2013
• Est. Priority Date: 06/22/2009
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tao, Luo
• Application Number:
  US13/942,967
• Publication Number:
  US 20130303157A1
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatus for coordination of sending reference signals in wireless network are disclosed. A network node may select a cell ID based on a measurement of adjacent cells so as to mitigate interference. A network node may communicate information to another network node to control transmitted resources in a protected interval so as to measure channel characteristics.

Claims

1. A method, comprising:

determining a time variation in an interference level experienced by a receiver;

generating a first channel estimate of a wireless communication channel as of a first time;

generating a second channel estimate of the wireless communication channel as of a second time;

weighting the first channel estimate and the second channel estimate in accordance with the time variation, thereby generating a first weighted channel estimate and a second weighted channel estimate; and

computing a weighted channel estimate based upon the first weighted channel estimate and the second weighted channel estimate.

2. The method of claim 1, wherein the determining includes measuring a parameter of a first reference signal received from a first network node and a parameter of a second reference signal received from a second network node.

3. The method of claim 1, wherein the first time occurs during a first sub-frame period and wherein the second time occurs during a second sub-frame period.

4. The method of claim 1, further including adjusting a filter responsive based on the first weighted channel estimate and the second weighted channel estimate.

5. A computer program product comprising a computer readable medium including codes for causing a computer to:

determine a time variation in an interference level experienced by a receiver;

generate a first channel estimate of a wireless communication channel as of a first time;

generate a second channel estimate of the wireless communication channel as of a second time;

weight the first channel estimate and the second channel estimate in accordance with the time variation, thereby generating a first weighted channel estimate and a second weighted channel estimate; and

compute a weighted channel estimate based upon the first weighted channel estimate and the second weighted channel estimate.

6. The computer program product of claim 5, wherein the determining includes measuring a parameter of a first reference signal received from a first network node and a parameter of a second reference signal received from a second network node.

7. The computer program product of claim 5, wherein the first time occurs during a first sub-frame period and wherein the second time occurs during a second sub-frame period.

8. The computer program product of claim 5, further including adjusting a filter responsive based on the first weighted channel estimate and the second weighted channel estimate.

9. An apparatus for use in a communication system, comprising:

a receiver module configured to receive a signal from a wireless communications channel and determine a time variation in an interference level in the channel; and

a channel estimation module configured to;

generate a first channel estimate of a wireless communication channel as of a first time and a second channel estimate of the wireless communication channel as of a second time;

weight the first channel estimate and the second channel estimate in accordance with the time variation, thereby generating a first weighted channel estimate and a second weighted channel estimate; and

compute a weighted channel estimate based upon the first weighted channel estimate and the second weighted channel estimate.

10. The apparatus of claim 9, wherein the determining includes measuring a parameter of a first reference signal received from a first network node and a parameter of a second reference signal received from a second network node.

11. The apparatus of claim 9, wherein the first time occurs during a first sub-frame period and wherein the second time occurs during a second sub-frame period.

12. The apparatus of claim 9, further including adjusting a filter responsive based on the first weighted channel estimate and the second weighted channel estimate.

13. An apparatus for use in a communication system, comprising:

means for receiving a signal from a wireless communications channel and determining a time variation in an interference level in the channel; and

means for generating a first channel estimate of a wireless communication channel as of a first time and a second channel estimate of the wireless communication channel as of a second time;

means for weighting the first channel estimate and the second channel estimate in accordance with the time variation, thereby generating a first weighted channel estimate and a second weighted channel estimate; and

means for computing a weighted channel estimate based upon the first weighted channel estimate and the second weighted channel estimate.

14. The apparatus of claim 13, wherein the means for determining includes means for measuring a parameter of a first reference signal received from a first network node and a parameter of a second reference signal received from a second network node.

15. The apparatus of claim 13, wherein the first time occurs during a first sub-frame period and wherein the second time occurs during a second sub-frame period.

16. The apparatus of claim 13, further including means for adjusting a filter responsive based on the first weighted channel estimate and the second weighted channel estimate.