Communication system

• US 9,860,803 B2
• Filed: 08/08/2014
• Issued: 01/02/2018
• Est. Priority Date: 08/09/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Mochizuki, Mitsuru, Maeda, Miho, Uga, Shinsuke, Fukui, Noriyuki
• Primary Examiner(s): Ngo, Ricky
• Assistant Examiner(s): La, Phong
• Application Number:
  US14/910,246
• Publication Number:
  US 20170171786A1
• Time in Patent Office: 1,243 Days
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 36/00835 Determination of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/04 Reselecting a cell layer in multi-layered cells
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point

Abstract

A UE in an idle state selects any of a group A, to which a cell of which coverage its own device is in, belongs and a group different from the group A, for example, a group B, and then measures cells belonging to the selected group for selecting a cell being a re-selection destination. A UE in a connected state selects any of the group B to which a cell connected with the UE belongs and a group different from the group B, for example, the group A, and measures cells belonging to the selected group for handover.

Claims

1. A communication system in which a plurality of communication terminal devices perform radio communication via a network configured by a network-side device including one or a plurality of base station devices, the communication system comprising:

a plurality of cells configured by said one or the plurality of base station devices and connected to said plurality of communication terminal devices to perform radio communication with said plurality of communication terminal devices, wherein

said plurality of cells are grouped into a plurality of groups by said network-side device and said network-side device notifies said plurality of communication terminal devices of information on said plurality of groups,

a communication terminal device, in said plurality of communication terminal devices is configured to

(a) in an idle state,

select a first group or a second group from the plurality of groups and measure cells belonging to the selected first or second group for re-selection, the first group including a cell on which the communication terminal device camps, and the second group being different from the first group, and

(b) in a connected state,

select a third group or a fourth group from the plurality of groups and measure cells belonging to the selected third or fourth group for handover, the third group including a cell to which the communication terminal device is connected, and the fourth group being different from the third group.

2. The communication system according to claim 1, wherein

said plurality of cells are grouped based on a cell size of each of the plurality of cells, and

said communication terminal device is configured to determine, based on a moving speed of the communication terminal device, which of a fifth group and a sixth group among the plurality of groups is to be selected, the fifth group including a cell having a same cell size as the cell on which the communication terminal device camps or to which the communication terminal device is connected, and the sixth group including a cell having a different cell size from the cell on which the communication terminal device camps or to which the communication terminal device is connected.

3. The communication system according to claim wherein

said plurality of cells are grouped based on a cell size of each of the plurality of cells, and

said communication terminal device is configured to determine a cell size based on a moving speed of the communication terminal device and select a group including a cell having the determined cell size.