Method, apparatus, and system for detecting allowed closed subscriber group cells (CSG)

摘要

The present invention relates to methods and arrangements that make CSG cell discovery more resource efficient. That is achieved by providing the UE with accurate and up-to-date knowledge of the physical cell identity (identities) of its allowed CSG cell(s). Accurate knowledge of the PCI of an allowed CSG cell greatly simplifies the search/discovery procedure for this CSG cell, in particular the procedure can be made much more resource efficient and UE battery lifetime can be prolonged.

主权项

1. A method in a User Equipment (UE) for detecting Closed Subscriber Group (CSG) cells which the UE is allowed to access, the method comprising:
receiving one or more physical cell identities and one or more CSG identities of one or more allowed CSG cells, wherein the UE is allowed access to an allowed CSG cell; reading broadcast information that is transmitted from each of one or more detected CSG cells and that indicates the one or more physical cell identities of the one or more detected CSG cells; deferring retrieval of a CSG identity of a detected CSG cell until after reading broadcast information transmitted from the detected CSG cell indicating a physical cell identity identical to one of the received physical cell identities of the one or more allowed CSG cells; and upon the deferred retrieval of the CSG identity of the detected CSG cell, verifying that the detected CSG cell is a cell that the UE is allowed to access by verifying that the retrieved CSG identity is identical to one of the received CSG identities of the one or more allowed CSG cells.