Base transceiver station apparatus and mobile communications system

• US 8,706,116 B2
• Filed: 07/08/2008
• Issued: 04/22/2014
• Est. Priority Date: 06/19/2003
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Tomoe, Naohito, Suyama, Syouhei
• Primary Examiner(s): Beamer, Temica M
• Assistant Examiner(s): Ajayi, Joel
• Application Number:
  US12/169,172
• Publication Number:
  US 20080268848A1
• Time in Patent Office: 2,114 Days
• Field of Search: 455436-443
• US Class Current: 455/436
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• 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 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 40/248 Connectivity information update
• CPC Class Codes: H04W 40/36 due to handover
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

When carrying out a downlink handover, a source base transceiver station from which a mobile node is moving receives packets to be transmitted, via a wireless section, to the mobile node from an IP network, and copies and transfers them to a destination base transceiver station to which the mobile node is moving. On the other hand, when carrying out an uplink handover, the source base transceiver station compares the reliability of transport blocks which are received via a wireless section, from the mobile node and which are demodulated and decoded by the local station with that of transport blocks which are received via an IP network, from another base transceiver station and which are demodulated and decoded thereby, packetizes selected transport blocks with a better quality, and transmits them to a communications-partner node according to a route table, thereby implementing distribution of traffic via the IP network.

Claims

1. A handover controlling method for controlling a handover when a mobile node is moved between radio areas covered by two base stations, comprising steps of:

requesting a destination base station to connect using results of comparison between a received power from a source base station and a received power from the destination base station;

requesting the source base station to transfer a copy of a packet destined for the mobile node to the destination base station receiving the request of connection;

transferring the copy of the packet from the source base station receiving the request of transfer to the destination base station through an interface between the source base station and the destination base station; and

transmitting, after the step of transferring is completed, the packet from the source base station and a copy of the packet from the destination base station to the mobile node.

2. A handover controlling method for controlling a handover when a mobile node is moved between radio areas covered by two base stations, comprising steps of:

requesting a destination base station to connect;

requesting the source base station to transfer a copy of a packet destined for the mobile node to the destination base station receiving the request of connection;

transferring the copy of the packet from the source base station receiving the request of transfer to the destination base station through an interface between the source base station and the destination base station; and

transmitting, after the step of transferring is completed, the packet from the source base station and the copy of the packet from the destination base station to the mobile node.