Network Access Selection Between Access Networks

Patent metadata

Field	Value
Publication number	US-2016286473-A1
Application number	US-201615181645-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Apr 26, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

WI-FI/3GPP access selection techniques are used to control selection by a user terminal between cellular network cells and WI-FI cells. Cellular network cells providing overlapping coverage with WI-FI cells are correlated with the WI-FI cells. A received signal strength threshold is determined for each WI-FI cell based on an average throughput of the cellular network cells correlated with the WI-FI cell. The WI-FI user terminal admit threshold is used to control the effective coverage of the WI-FI cell. A user terminal operating within a cellular network cell is admitted to a WI-FI only if it is within the effective coverage area of the WI-FI cell as determined by the received signal strength threshold. Increasing the threshold shrinks the effective coverage area of the WI-FI cell to allow user terminal only of strong RSSI to make connection to the cell, and steers user terminal of weak RSSI away from the WI-FI cell. In contrary, decreasing the threshold expands the effective coverage area of the WI-FI cell and effectively allows more user terminal making connection to the WI-FI cell.

First claim

What is claimed is:

1 . A cell correlation method for correlating cells in first and second access networks, the method comprising:
sending a cell identification request from the first access network to the second access network, the cell identification request including a user terminal identification of a user terminal attempting to connect to a cell in the first access network; receiving, responsive to the cell identification request, a cell identification of a last known cell in the second access network in which the user terminal was present; and correlating the received cell identification with the cell in the first access network.

2 . The method of claim 1 further comprising receiving the user identification of the user terminal from an authentication server.

3 . The method of claim 1 wherein the cell correlation method is performed on an ongoing basis in order to detect changes in network configuration.

4 . The method of claim 1 further comprising: storing cell correlation information in a cell correlation table.

5 . The method of claim 4 further comprising:
determining, based on the cell correlation information, a group of one or more cells in the second access network that are correlated with a cell in the first access network;
obtaining a performance measurement for the group of one or more cells in the second access network that are correlated with a cell in the first access network;
computing an admission threshold for the cell in the first access network based on the performance measurement; and
controlling the admission of a user terminal operating in the second access network to the cell in the first access network based on the admission threshold.

6 . The method of claim 5 wherein the admission threshold comprises a minimum received signal strength for the user terminal allowed by the cell in the first access network.

7 . The method of claim 5 wherein computing the admission threshold based on a performance measurement comprises computing the admission threshold based on a throughput for the group of cells in the second access network.

8 . The method of claim 7 wherein computing the admission threshold based on a throughput for the group of cells in the second access network comprises computing the admission threshold as a function of a throughput of the cell in the first access network and the throughput for the group of cells in the second access network.

9 . The method of claim 5 wherein computing the admission threshold for the cell in the first access network comprises computing the admission threshold by a centralized access control node in the first access network.

10 . The method of claim 9 wherein controlling the admission of a user terminal operating in a cell of the second access network to the cell in the first access network based on the admission threshold comprises sending the admission threshold from the centralized access control node to an access point for the cell in the first access network.

11 . The method of claim 5 wherein computing the admission threshold for the cell in the first access network comprises computing the admission threshold by an access point for the cell in the first access network.

12 . The method of claim 11 wherein controlling the admission of a user terminal operating in a cell of the second access network to the cell in the first access network based on the admission threshold comprises:
measuring a received signal strength of a signal received from a user terminal attempting to access the cell in the first access network; and
admitting the user terminal to the cell in the first access network based on a comparison of the received signal strength to the admission threshold.

13 . The method of claim 12 further comprising silently rejecting an attempt by a user terminal to connect to a first cell of the first access network by ignoring data transmissions from the user terminal to the access point.

14 . The method of claim 11 wherein obtaining a performance measurement for a group of one or more cells in the second access network that are correlated with the cell in the first network comprises:
receiving performance statistics for the group of cells in the second access network correlated with the cell in the first access network; and
computing the performance measurement based on the performance statistics.

15 . A network node in a wireless communication network, the network node comprising:
a network interface circuit; a processing circuit for correlating cells in first and second access networks that provide overlapping coverage, the processing circuit being configured to:
send a cell identification request to the second access network, the cell identification request including a user terminal identification for a user terminal attempting to connect to a cell in the first access network;
receive, responsive to the cell identification request, a cell identification of a last known cell in the second access network in which the user terminal was present; and
correlate the received cell identification with a connecting cell in the first access network.

16 . The network node of claim 15 wherein the processing circuit is further configured to receive the user identification from an authentication server.

17 . The network node of claim 15 wherein the processing circuit is further configured to detect changes in network configuration by correlating cells in the first and second networks on an ongoing basis.

18 . The network node of claim 15 wherein the processing circuit is configured to store cell correlation information in a cell correlation table.

19 . The network node of claim 15 wherein the processing circuit is further configured to:
determine, based on the cell correlation information, a group of one or more cells in the second access network that are correlated with a cell in the first access network;
obtain a performance measurement for a group of one or more cells in the second access network that are correlated with a cell in the first access network;
compute an admission threshold for a cell in the first access network based on the performance measurement; and
control the admission of a user terminal operating in the second access network to the cell in the first access network based on the admission threshold.

20 . The network node of claim 19 wherein the admission threshold comprises a minimum received signal strength (RSS) for the user terminal allowed by the cell in the first access network.

21 . The network node of claim 19 wherein, to compute an admission threshold for the cell in the first access network based on a performance measurement, the processing circuit is configured to compute the admission threshold based on a throughput for the group of cells in the second access network.

22 . The network node of claim 21 wherein, to compute the admission threshold based on the throughput for the group of cells in the second access network, the processing circuit is configured to compute the admission threshold further based on a throughput of the cell in the first access network.

23 . The network node of claim 19 wherein the network node comprises a centralized access control node configured to compute the admission thresholds for two or more cells in the second access network.

24 . The network node of claim 23 wherein, to control the admission of a user terminal operating in a c

Assignees

• ERICSSON TELEFON AB L M (publ)

Inventors

• Huang Kaiyuan
• Tam Gary
• Rayment Stephen

Classifications

• H04W12/06 Primary

  Authentication · CPC title

• H04W48/18

  Selecting a network or a communication service · CPC title

• H04W48/20

  Selecting an access point · CPC title

• H04W36/16

  Performing reselection for specific purposes · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title