User equipment and base station in carrier aggregation system, and call admission control method for use with the user equipment and base station

• US 8,599,686 B2
• Filed: 10/30/2009
• Issued: 12/03/2013
• Est. Priority Date: 12/22/2008
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Jung, Kwang-Ryul, Lim, Soon-Yong, Park, Ae-Soon
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US12/919,910
• Publication Number:
  US 20110038280A1
• Time in Patent Office: 1,495 Days
• Field of Search: 370/230, 370/329, 370/350, 370/395.2, 455/67.11, 455/450, 455/509
• US Class Current: 370/230
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure

Abstract

User equipment and a base station in a carrier aggregation system, and a call admission method thereof are discussed. The user equipment includes multiple physical layers, and the base station provides multiple component carriers. When messages for connection setup are transmitted and received between the user equipment and base station, the messages may include information about what component carriers are selected for the physical layers, information about what component carriers are selectable for the physical layers, information about calculations for uplink timing alignment. Call admission control and load balancing may be performed based on the information included in the messages. Accordingly, a carrier aggregation system providing call admission and load balancing is achieved.

Claims

1. A computing device-implemented method in which user equipment performs a call admission procedure in a carrier aggregation system which provides multiple component carriers, comprising:

transmitting a connection setup request message for communication with the respective component carriers, to a base station; and

receiving a connection setup admission message or a connection setup rejection message from the base station in response to the connection setup request message received at the base station, and, in the event of receiving the connection setup rejection message, changing component carriers selected by the user equipment to other component carriers, or, in the event of receiving the connection setup admission message, establishing uplink timing alignment between the component carriers selected by the user equipment,

wherein the receiving of the connection setup rejection message includes;

receiving the connection setup rejection message that includes information about the component carries that can be used by the user equipment, and

changing a component carrier selected for a primary physical layer which is one among a plurality of physical layers included in the user equipment based on the information about the component carriers that can be used by the user equipment.

2. The method of claim 1, wherein the connection setup request message includes information about a number of the component carriers that can be used by the user equipment or information about what component carriers are selected by the user equipment.

3. A computing device-implemented method in which user equipment performs a call admission procedure in a carrier aggregation system which provides multiple component carriers, comprising:

transmitting a connection setup request message for communication with the respective component carriers, to a base station; and

receiving a connection setup admission message or a connection setup rejection message from the base station in response to the connection setup request message received at the base station, and, in the event of receiving the connection setup rejection message, changing component carriers selected by the user equipment to other component carriers, or, in the event of receiving the connection setup admission message, establishing uplink timing alignment between the component carriers selected by the user equipment,

wherein the receiving of the connection setup admission message includes;

receiving the connection setup admission message that includes information about calculations for uplink timing alignment or information about dedicated preambles of the respective component carriers, and

establishing uplink timing alignment between the component carriers selected by the user equipment based on the information about calculations for uplink timing alignment or the information about dedicated preambles of the respective component carriers.