Cell selection and reselection for closed subscriber group cells

• US 9,615,303 B2
• Filed: 10/12/2015
• Issued: 04/04/2017
• Est. Priority Date: 03/24/2008
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Olvera-Hernandez, Ulises, Somasundaram, Shankar, Wang, Peter S., Mukherjee, Rajat P.
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): HOM, SHICK C
• Application Number:
  US14/880,788
• Publication Number:
  US 20160050610A1
• Time in Patent Office: 540 Days
• Field of Search: None
• CPC Class Codes: H04J 11/0093 Neighbour cell search
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

Apparatuses and methods are provided for performing cell reselection, the method includes detecting a signal of cell for cell reselection on a frequency, where the signal includes an intra-frequency reselection indicator, determining from the signal whether the cell is a barred cell, on a condition that the cell is a barred cell, determining that the barred cell is not a candidate for cell reselection, determining whether the barred cell is a Closed Subscriber Group (CSG) cell, and allowing intra-frequency cell reselection to a different cell on the frequency regardless of the value of the intra-frequency reselection indicator on a condition that the barred cell is a CSG cell and that the different cell meets reselection criteria.

Claims

1. A wireless transmit/receive unit (WTRU) comprising:

a receiver and a processor configured to detect a signal of a cell for cell reselection on a frequency, wherein the signal includes an intra-frequency reselection indicator;

the processor is further configured to determine from the signal whether the cell is a barred cell;

the processor is further configured to, on a condition that the cell is a barred cell, determine that the barred cell is not a candidate for cell reselection; and

the processor is further configured to determine whether the barred cell is a Closed Subscriber Group (CSG) cell and is further configured to allow intra-frequency cell reselection to a different cell on the frequency regardless of the value of the intra-frequency reselection indicator on a condition that the barred cell is a CSG cell and that the different cell meets reselection criteria.

2. The WTRU of claim 1, wherein the receiver and the processor are further configured to reselect to another cell that is on a different frequency from the frequency on a condition that the barred cell is a non-CSG cell and that the intra-frequency reselection indicator indicates that intra-frequency cell reselection is disallowed.

3. The WTRU of claim 1, wherein, the receiver and the processor are further configured to, on a condition that the cell is a non-barred cell, consider the cell as a candidate for cell reselection.

4. The WTRU of claim 1, wherein, the receiver and the processor are further configured to, on a condition that the barred cell is the CSG cell and the different cell does not meet the reselection criteria, allowing intra-frequency cell reselection to another cell based on the value of the intra-frequency reselection indicator.

5. The WTRU of claim 1, wherein the different cell is a CSG cell on a same frequency as the frequency of the barred cell.

6. A method comprising:

detecting, by a wireless transmit/receive unit (WTRU), a signal of cell for cell reselection on a frequency, wherein the signal includes an intra-frequency reselection indicator;

determining, by the WTRU, from the signal whether the cell is a barred cell;

on a condition that the cell is a barred cell, determining, by the WTRU, that the barred cell is not a candidate for cell reselection;

determining, by the WTRU, whether the barred cell is a Closed Subscriber Group (CSG) cell; and

allowing, by the WTRU, intra-frequency cell reselection to a different cell on the frequency regardless of the value of the intra-frequency reselection indicator on a condition that the barred cell is a CSG cell and that the different cell meets reselection criteria.

7. The method of claim 6, further comprising:

reselecting, by the WTRU, to another cell that is on a different frequency from the frequency of the cell on a condition that the barred cell is a non-CSG cell and that the intra-frequency reselection indicator indicates that intra-frequency cell reselection is disallowed.

8. The method of claim 6, wherein, on a condition that the cell is a non-barred cell, considering, by the WTRU, the cell as a candidate for cell reselection.

9. The method of claim 6, wherein, on a condition that the barred cell is the CSG cell and that the different cell does not meet the reselection criteria, allowing, by the WTRU, intra-frequency cell reselection to another cell based on the value of the intra-frequency reselection indicator.

10. The method of claim 6, wherein the different cell is a CSG cell on a same frequency as the frequency of the barred cell.