Radio based station apparatus and base station controller

• US 7,684,369 B2
• Filed: 02/27/2004
• Issued: 03/23/2010
• Est. Priority Date: 03/25/2003
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Tajima, Yoshiharu
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US10/789,749
• Publication Number:
  US 20040192390A1
• Time in Patent Office: 2,216 Days
• Field of Search: 455436-438, 4554321-444, 455560-5621, 455/101, 455/41.2, 370331-344, 370/328, 370/352, 370/401, 375/267, 375/347, 709/223
• US Class Current: 370/331
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The invention provides a radio base station apparatus forming a wireless zone in a mobile communication system and to a base station controller performing channel control over a terminal visiting a wireless zone. The radio base station apparatus has an identifying section identifying a particular radio base station that is to maintain a radio channel between the radio base station apparatus and a terminal during a process of diversity handover, a network interface section delivering a signal to a network if a local station is not the particular radio base station, and an inter-office interface section delivering to the network a composite wave of the signal and a signal having arrived and forwarded from the terminal via the radio channel at a radio base station forming a wireless zone adjacent to a wireless zone formed by the local station if the local station is the particular radio base station.

Claims

1. A radio communication method comprising:

maintaining identification information allotted to a radio terminal for receiving data without renewing the identification information when the radio terminal moves from an area of a first radio base station to an area of a second radio base station, and transmitting data and the identification information to the radio terminal from the first and second radio base stations in a diversity transmission manner; and

renewing the identification information when the radio terminal moves to an area of a third base station, and transmitting data and the renewed identification information to the radio terminal from the third radio base station, wherein

the data is transmitted from the third base station in a non-diversity transmission manner with the first and second base stations.

2. The radio communication method according to claim 1, wherein said identification information is an IP address.

3. The radio communication method according to claim 1, wherein said renewed identification information is different from the identification information before the renewal.

4. The radio communication method according to claim 1, wherein

said first radio base station transmits primary information and said second radio base station transmits secondary information, the primary information and the secondary information including same content information,

said radio terminal diversity-receives the primary information and the secondary information, and

said third radio base station transmits information without forming diversity transmission relation with the first radio base station for transmission of the information.

7. The radio terminal of claim 4, wherein identification information and the renewed identification information are unique.

5. A radio system performing radio communication with a radio terminal that is in communication with a first radio base station, comprising:

a second radio base station transmitting data and identification information allotted to the radio terminal for receiving data to the radio terminal from the first radio base station without renewing the identification information when the radio terminal moves from an area of the first radio base station to an area of the second radio base station, the data being transmitted from the first and second radio base stations in parallel; and

a third radio base station renewing the identification information for receiving data when the radio terminal moves to an area of the third radio base station, and transmitting data and the renewed identification information to the radio terminal, wherein

the data is transmitted from the third base station in a non-diversity transmission manner with the first and second base stations.

6. A radio terminal performing radio communication with a radio base station, comprising:

a receiving unit receiving data and identification information, which are transmitted from a first and a second radio base station in parallel, allotted by the first radio base station from the second base station without renewing the identification information when the radio terminal moves to an area of the second radio base station, and being able to receive data and renewed identification information after receiving the identification information for receiving data when the radio terminal moves to an area of a third radio base station, wherein

the data is transmitted from the third base station in a non-diversity transmission manner with the first and second base stations.