Radio communication system and communication terminal apparatus used therein

• US 20020105935A1
• Filed: 01/29/2002
• Published: 08/08/2002
• Est. Priority Date: 06/06/2000
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miya, Kazuyuki
• Application Number:
  US10/048,222
• Publication Number:
  US 20020105935A1
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04B 2201/70702 Intercell-related aspects
• CPC Class Codes: H04B 7/26 at least one of which is mobile
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation

Abstract

An FDD system speech signal transmitted from a mobile station (MS) 201 which is a communication terminal is received by a base station (BS) 202 and undergoes predetermined processing, and the obtained received data is sent to a mobile switching center (MSC) 204 via a radio network controller 203. In the MSC, data from a number of base stations is bundled and sent to a telephone network 207. On the other hand, a TDD system high-speed packet transmitted from the mobile station (MS) 201 is received by a base station (BS) 205 and undergoes predetermined processing, and the obtained received data is routed by a router 206 and sent to an IP (Internet Protocol) packet network 208.

Claims

1. A radio communication system whereby, in a radio communication system that has a plurality of systems including a CDMA-FDD system and a CDMA-TDD system, one or other of said CDMA-FDD system and said CDMA-TDD system includes a channel with a high transmission rate, and a mobile station selects a system to which connection is desired from said plurality of systems including a CDMA-FDD system and a CDMA-TDD system, and performs communication with the selected system.

2. The radio communication system according to claim 1, wherein said CDMA-FDD system and CDMA-TDD system are controlled by a common control station and are connected to a telephone network via an exchange.

3. The radio communication system according to claim 1, wherein at least one system of said CDMA-FDD system and CDMA-TDD system is connected to an IP packet network via a router.

4. The radio communication system according to claim 1, wherein it is possible to perform communication with said CDMA-FDD system and CDMA-TDD system simultaneously on different channels.

5. The radio communication system according to claim 1, wherein said mobile station selects a system taking into account at least one item chosen from a group consisting of service, communication environment, and speed of movement of the station itself, in said CDMA-FDD system and CDMA-TDD system.

6. A communication terminal apparatus comprising:

monitoring means for monitoring downlink signals from each system in a radio communication system that has a plurality of systems including a CDMA-FDD system and a CDMA-TDD system;

selecting means for selecting a system to be connected to based on information monitored by said monitoring means and a connection request from the station itself; and

communication connecting means for performing communication connection to a base station of a system selected by said selecting means.

7. The communication terminal apparatus according to claim 6, wherein said selecting means selects a system taking into account at least one item chosen from a group consisting of service, communication environment, and speed of movement of the station itself, in said CDMA-FDD system and CDMA-TDD system.

8. A base station apparatus comprising:

determining means for determining, based on connection request information from a communication terminal apparatus and communication condition information measured by the station itself, whether or not connection to said communication terminal apparatus is possible; and

communication connecting means for, when a result of determination by said determining means is that connection is possible, performing communication connection to said communication terminal apparatus, and, when a result of determination by said determining means is that connection is not possible, notifying said communication terminal apparatus that connection is not possible;

wherein said communication terminal apparatus comprises;

monitoring means for monitoring downlink signals from each system in a radio communication system that has a plurality of systems including a CDMA-FDD system and a CDMA-TDD system;

selecting means for selecting a system to be connected to based on information monitored by said monitoring means and a connection request from the station itself; and

communication connecting means for performing communication connection to a base station of a system selected by said selecting means.