Selection of wireless devices for measurement reports

Patent metadata

Field	Value
Publication number	US-9603042-B1
Application number	US-201514640205-A
Country	US
Kind code	B1
Filing date	Mar 6, 2015
Priority date	Feb 6, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A database is maintained that maps source cell regions to channel condition on the neighbor cell(s) coverage. The database also tracks whether the neighbor cell has better, weaker, or similar signal strength than the source cell. The channel condition and bitrate requirement of each wireless device being served by the source cell are also tracked. Once a particular neighbor cell has been selected for traffic offload (i.e., handover of one or more wireless devices), the source cell uses the database to select which wireless devices should send measurement reports. Those wireless devices with channel conditions that are mapped in the database to the target cell's coverage are designated for possible selection. Among these wireless devices, either the wireless devices with the highest or lowest bitrate requirements are selected to provide measurement reports for the target cell.

First claim

What is claimed is:

1. A method for selecting a wireless device to send a measurement report, the method comprising:
selecting, at a first access node, at least one neighboring access node for traffic offload from the first access node based on a criteria;
determining, at the first access node, a modulation and coding scheme (MCS) index for each of a plurality of wireless devices served by the first access node, the MCS index being used to determine a likelihood that at least one wireless device is located within a coverage area of the selected neighboring access node, wherein a low MCS index indicates that the wireless device is located at an edge of the coverage area of the first access node and within the coverage area of the selected neighboring access node, wherein a high MCS index indicates that the wireless device is located within a full strength coverage area of the first access node;
mapping, at the first access node, the MCS index of the at least one wireless device to a stored signal strength of the neighboring access node; and
instructing, via the first access node, the at least one wireless device to provide a measurement report of a current signal strength of the neighboring access node.

2. The method of claim 1 , wherein the criteria corresponds to the neighboring access node having a signal strength that is stronger or equivalent to a signal strength of the first access node.

3. The method of claim 1 , wherein the criteria corresponds to the neighboring access node having a signal strength that is weaker than a signal strength of the first access node.

4. A communication system, comprising:
a processing node comprising a processor and a transmitter, the processing node configured to:
select at least one neighboring access node for offloading traffic from a first access node based on a criteria;
determine a modulation and coding scheme (MCS) index for each of a plurality of wireless devices served by the first access node, wherein the MCS index is used to define a location of at least one wireless device in a coverage area of the selected neighboring access node;
map the MCS index of the at least one wireless device to a stored signal strength of the neighboring access node; and
instruct the at least one wireless device to provide a measurement report of a current signal strength of the neighboring access node,

wherein the criteria corresponds to the neighboring access node having a signal strength that is stronger or equivalent to a signal strength of the first access node, and
wherein the first access node selects the at least one wireless device based on a required bit rate that is higher compared to a required bit rate of each of the other wireless devices of the plurality of wireless devices.

5. The communication system of claim 4 , wherein the first access node selects at least one second wireless device based on a determined minimum bit rate requirement that is lower compared to a minimum bit rate requirement of each of the other plurality of wireless devices.

6. The communication system of claim 4 , wherein a high MCS index indicates that the wireless device is located in a full strength coverage area of the first access node and a low MCS index indicates that the wireless device is located at an edge of the coverage area of the first access node.

7. The communication system of claim 6 , wherein the MCS index of each of the plurality of wireless devices is used to determine a likelihood that the wireless device is in the coverage area of the selected neighboring access node.

8. A method of operating a communication system, comprising:
selecting, at a first access node, at least one target access node for offloading traffic from a source access node;
tracking, at the first access node, a modulation and coding scheme (MCS) and a minimum required bit rate for each of a plurality of wireless devices, wherein the MCS defines a location of the wireless device in a coverage area of the selected target access node; and
selecting, at the first access node, a subset of the plurality of wireless devices to provide measurement reports based on the tracked MCS and the minimum required bit rate.

9. The method of claim 8 , wherein the subset is selected as a predetermined number of wireless devices having the highest minimum required bit rate.

10. The method of claim 9 , wherein the subset is selected if the selected target access node has a signal strength that is stronger or equivalent to a signal strength of the source access node.

11. The method of claim 8 , wherein the subset is selected as a predetermined number of wireless devices having the lowest minimum required bit rate.

12. The method of claim 11 , wherein the subset is selected if the selected target access node has a signal strength that is weaker than a signal strength of the source access node.

Assignees

• Sprint Spectrum Lp
• Sprint Spectrum Lp

Inventors

• Naim Muhammad
• Liu Chunmei
• Vivanco Daniel
• Rasool Shahzada

Classifications

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W36/0085 Primary

  Hand-off measurements · CPC title

• H04W28/0236

  radio quality, e.g. interference, losses or delay · CPC title