# US 12,004,073 B2 · Mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,073 B2 - Document ID: US12004073B2 - Status: Granted - Kind: B2 - Application number: 17/660,879 - Filed: 2022-04-27 - Published: 2022-08-11 - Granted: 2024-06-04 - Earliest claimed: 2008-11-04 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Miho Maeda; Mitsuru Mochizuki; Taiga Saegusa; Yasushi Iwane; Yuji Kakehi; Masayuki Nakazawa; Taisei Suemitsu - Web page: https://patentgrep.com/patent/US12004073B2 ## CPC - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 4/08: User group management - H04W 8/02: Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks - H04W 72/04: Wireless resource allocation - Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A closed subscriber group (CSG) cell is a cell that allows use of subscribers. In order to receive the service by the CSG cell, a CSG-ID is required to be notified to a user equipment, which cannot be obtained in a situation outside the reach of radio waves from a non-CSG cell. In a mobile communication system including base stations respectively provided to a CSG cell and a non-CSG cell in which access is made to the CSG cell with the use of a CSG-ID issued in a case where use of the CSG cell is allowed, the base station provided in the CSG cell refers to the notified identification information of a user equipment and then transmits a tracking area update request from the user equipment to a core network, and the core network determines whether the user equipment is allowed to use the CSG cell and, in the case where the use is allowed, transmits a signal for allowing assignment of radio resources to the user equipment and the CSG-ID. The user equipment accesses the CSG cell with the use of the CSG-ID. ## Claims ### Claim 1 A communication method performed in a mobile communication system which comprises specific user equipments, base stations and a radio network controller managing an access made by the user equipments to the base stations and a tracking area for tracking location of the user equipments, the communication method comprising: requesting an update of a tracking area from the user equipments to the radio network controller through the base stations manually selected by the user equipments; checking in the radio network controller whether access made by the user equipments to the base stations is allowed; rejecting an update of a tracking area from the radio network controller to the user equipments through the base stations in a case where access made by the user equipments to the base stations is not allowed; and selecting base stations to be connected except for the base stations to which access made by the user equipments is not allowed in a case where the update of the tracking area is rejected. ### Claim 2 A mobile communication system comprising specific user equipments, base stations and a radio network controller managing an access made by the user equipments to the base stations and a tracking area for tracking location of the user equipments, wherein the user equipments comprise a processor coupled to a memory and configured to: request an update of a tracking area to the radio network controller through the base stations manually selected by the user equipments, and select base stations to be connected except for the base stations to which access made by the user equipments is not allowed in a case where the update of the tracking area is rejected, and the radio network controller comprises a processor coupled to a memory and configured to: check whether access made by the user equipments to the base stations is allowed, and reject an update of a tracking area to the user equipments through the base stations in a case where access made by the user equipments to the base stations is not allowed. ### Claim 3 A user equipment for a mobile communication system comprising specific user equipments, base stations and a radio network controller managing an access made by the user equipments to the base stations and a tracking area for tracking location of the user equipments, the user equipment comprising a processor coupled to a memory and configured to: request an update of a tracking area to the radio network controller through the base stations manually selected by the user equipments; and select base stations to be connected except for the base stations to which access made by the user equipments is not allowed in a case where the update of the tracking area is rejected. ### Claim 4 A radio network controller for a mobile communication system comprising specific user equipments, base stations and the radio network controller managing an access made by the user equipments to the base stations and a tracking area for tracking location of the user equipments, the radio network controller comprising a processor coupled to a memory and configured to: check whether access made by the user equipments to the base stations is allowed in a case where an update of a tracking area through the base stations manually selected by the user equipments is requested; and reject an update of a tracking area to the user equipments through the base stations in a case where access made by the user equipments to the base stations is not allowed. ### Claim 5 (depends on 4) The radio network controller according to claim 4, wherein the memory stores a white list that is used, in part, to check whether access made by the user equipments is allowed.