Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method

• US 6,469,995 B1
• Filed: 12/20/1999
• Issued: 10/22/2002
• Est. Priority Date: 04/23/1998
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation), Radiodetection Limited
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Voyer, Nicolas, Murai, Hideshi, Yano, Yasuhiro
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US09/467,063
• Time in Patent Office: 1,037 Days
• Field of Search: 455/436, 455/437, 455/443, 455/444, 455/524, 455/525, 455/67.1, 455/67.3, 455/552, 455/72, 455/434, 455/553, 370/331, 370/332, 370/335, 370/336, 370/337, 370/342, 370/347, 370/477
• US Class Current: 370/331
• CPC Class Codes: H04B 7/2634 for channel frequency control
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/1443 between licensed networks
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 84/04 Large scale networks; Deep hierarchical networks
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

In the mobile radio communication system where the UMTS and an another system coexist an idle slot for observing the frequency component of another system is inserted in one superframe of UMTS. The duration of this idle slot is at most half of the duration of one frame that form the superframe and it is inserted at an interval of a specified number of frames. Therefore, the frequency component of the another system can be observed securely from the UMTS. Further, deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.

Claims

1. A mobile radio communication system, comprising:

a first communication system employing a code division multiple access method of transmitting frames via a first superframe which is formed of a plural frames and contains a specified first system idle period; and

a second communication system employing another method for transmitting frames via a second superframe for downlink traffic containing a specified second system idle period for observing a frequency component of a control channel of the second communications system, the specified second system idle period being inserted in the second superframe based on a difference between an integer multiple number of frames of the second superframe and another number of frames of a third superframe for the control channel of the second communications system, wherein,

said first communication system performs error correction and interleaving before transmitting frames,

a duration of the specified first system idle period is at most half of duration of a single frame of the first superframe and is inserted in the first superframe at a regular or irregular interval of a specified number of slots, and

the frequency component of the control channel of said second communication system is observed from said first communication system via the first system.

2. The mobile radio communication system according to claim 1, wherein

said second superframe has a transmission period equal to a transmission period of said first superframe.

3. The mobile radio communication system according to claim 2, wherein

the regular or irregular interval of a specified number of slots is determined according to a difference between a duration of said first superframe and a duration of said third superframe.

4. The mobile radio communication system according to claim 1, wherein

the specified first system idle period is divided among a plurality of places in the first superframe so as to create a first system idle period division and the first system idle period division may be differently set in each frame of the first superframe.

5. The mobile radio communication system according to claim 4, wherein

a total duration of first system idle period divisions is equal to the specified first system idle period and corresponds to second system idle period.

6. The mobile radio communication system according to claim 1, wherein

the frame in which the specified first system idle period is inserted is compressed so as to create a compressed frame and is transmitted intermittently.

7. The mobile radio communication system according to claim 6, wherein

the compressed frame is generated by increasing a coding rate.

8. The mobile radio communication system according to claim 7, wherein

the compressed frame is generated with a spreading factor that is the same as a spreading factor for a frame that does not contain the specified first system idle period.

9. A communication apparatus, applied in a mobile radio communication system, comprising:

a control unit configured to insert a specified first system idle period in a first superframe which is formed of plural frames at a regular or irregular interval of a specified number of slots, said specified first system idle period configured to have a duration that is at most half of one frame that forms the first superframe, wherein,

said control unit is a component of a first communication system employing a code division multiple access method of transmitting frames via the first superframe,

said specified first system idle period is configured to enable said first communication system to monitor a frequency component of a control channel of a second communication system, and

said second communication system employs another method for transmitting frames via a second superframe for downlink traffic, said second superframe containing a specified second system idle period for observing the frequency component of the control channel of the second communication system, the specified second system idle period being inserted in the second superframe based on a difference between an integer multiple number of frames of the second superframe and another number of frames of a third superframe from the control channel of the second communication system,

said first communication system performs error correction and interleaving before transmitting frames, and

the frequency component of the control channel of said second communication system is observed from said first communication system via the specified first system idle period inserted by said control unit.

10. The communication apparatus according to claim 9, wherein

said second superframe has a transmission period equal to a transmission period of said first superframe.

11. The communication apparatus according to claim 10, wherein

said control unit determines the regular or irregular interval of a specified number of slots according to a difference in the transmission period of the first superframe and a transmission period of the third superframe.

12. The communication apparatus according to claim 9, wherein

said control unit divides the specified first system idle period among a plurality of places in the first superframe so as to create a first system idle period division and the first system idle period division may be differently set in each frame of the first superframe.

13. The communication apparatus according to claim 12, wherein

a total duration of first system idle period divisions is equal to the specified first system idle period and corresponds to the second system idle period.

14. The communication apparatus according to claim 9, wherein

said control unit increases a coding rate when generating a compressed frame.

15. The communication apparatus according to claim 14, wherein

said control unit sets a spreading factor when generating the compressed frame that is equal to a spreading factor for a frame that does not contain the specified first system idle period.

16. The communication apparatus according to claim 9, wherein said control unit increases an average transmission power for a compressed frame.

17. A mobile radio communication method, applied in a mobile radio communication system, comprising:

a first communication system compressing frames and intermittently transmitting the compressed frames after inserting a specified first system idle period in a first superframe which is formed of plural frames, said specified first system idle period having a duration that is at most half of a single frame of the first superframe at a regular or irregular interval of a specified number of slots determined by a relation between said first superframe and a third superframe, wherein said third superframe is a component of a control channel of a second communication system; and

the fist communication system observing a frequency component of a control channel of said second communication system via the specified first system idle period, wherein,

said first communication system employs a code division multiple access method of transmitting frames via the first superframe,

said second communication system employs another method for transmitting frames via a second superframe for downlink traffic, said second superframe containing a specified second system idle period for observing the frequency component of the control channel of the second communications system, the specified second system idle period being inserted in the second superframe based on a difference between an integer multiple number of frames of the second superframe and another number of frames of the third superframe, and

said first communication system performs error correction and interleaving before transmitting frames.

18. The mobile radio communication method according to claim 17, wherein

the second superframe has a transmission period equal to a transmission period of the first superframe.

19. The mobile radio communication method according to claim 17, wherein

a compressed frame is generated in the first step by increasing a coding rate.

20. The mobile radio communication method according to claim 19, wherein

the compressed frame is generated in the first step at a spreading factor equal to a spreading factor for a frame that does not contain the specified first system idle period.

21. The mobile radio communication method according to claim 17, wherein

an average transmission power is increased when transmitting a compressed frame.