Mobile radio communication system, communication appartus applied in a mobile radio communication system, and mobile radio communication method

• US 7,995,541 B2
• Filed: 10/31/2007
• Issued: 08/09/2011
• Est. Priority Date: 04/23/1998
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Voyer, Nicolas, Murai, Hideshi, Yano, Yasuhiro
• Primary Examiner(s): HO, DUC CHI
• Application Number:
  US11/931,270
• Publication Number:
  US 20080062949A1
• Time in Patent Office: 1,378 Days
• Field of Search: None
• US Class Current: 370/335
• 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, the deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.

Claims

1. A mobile radio communication system employing a CDMA method, comprising:

a transmitter transmitting a plurality of uncompressed frames and a plurality of compressed frames within a first frame transmission period, which is formed of plural frames and required to transmit a predetermined number of frames;

a receiver receiving said uncompressed frames and said compressed frames transmitted by said transmitter , said transmitter including an interleaver which performs interleaving of data in an uncompressed frame in bit units;

a spreading unit, in which a plurality of uncompressed frames processed by said interleaver are inputted, wherein said spreading unit compresses uncompressed frames within said first frame transmission period to produce compressed frames, divides each of said compressed frames into two divided parts, allocates one of said divided parts at the beginning of a frame period and the other one of said divided parts at the end of said frame period, and creates, into each of said compressed frames, an idle period; and

a radio frequency transmitter which transmits said compressed frames processed by said spreading unit,

and said receiver including

a radio frequency receiver which monitors, within said idle period, a frequency component in a control channel, said control channel having a second frame transmission period and being employed in a different mobile radio communication system, wherein the idle periods are set fixedly in the first transmission period by the transmitter.

2. The mobile radio communication system according to claim 1, wherein said different mobile radio communication system is GSM system.

3. A transmitter used in a mobile radio communication system employing a CDMA method, wherein said transmitter transmits a plurality of uncompressed frames and a plurality of compressed frames within a first frame transmission period, which is formed of plural frames, and said first frame transmission period is defined as a period required to transmit a predetermined number of frames, said transmitter comprising:

an interleaver which performs interleaving of data in an uncompressed frame in bit units; and

a spreading unit, in which a plurality of uncompressed frames processed by said interleaver are inputted, wherein said spreading unit compresses uncompressed frames within said first frame transmission period to produce compressed frames, divides each of said compressed frames into two divided parts, allocates one of said divided parts at the beginning of a frame period and the other one of said divided parts at the end of said frame period, and creates, into each of said compressed frames, an idle period ; and

a radio frequency transmitter which transmits said compressed frames processed in said spreading unit, wherein the idle periods are set fixedly in the first frame transmission period by the transmitter.

4. A mobile radio communication method used in a CDMA system, wherein said system includes a transmitter which performs interleaving of data to be transmitted in bit units, and transmits a plurality of uncompressed frames and a plurality of compressed frames within a first frame transmission period, which is formed of plural frames, and a receiver that receives said uncompressed frames and said compressed frames transmitted by said transmitter, said first frame transmission period is defined as a period required to transmit a predetermined number of frames, said mobile radio communication method comprising:

steps, executed by said transmitter, for compressing uncompressed frames within said first frame transmission period;

dividing each of said compressed frames into two divided parts for allocating one of said divided parts at the beginning of a frame period and the other one of said divided parts at the end of said frame period to create, in each of said compressed frames, an idle period;

transmitting said compressed frames with said idle period to said receiver; and

a step, executed by said receiver for monitoring frequency components in a control channel having a second frame transmission period within said idle period, wherein

said second frame transmission period is employed in a different mobile radio communication system, and

the idle periods are set fixedly in the first transmission period by the transmitter.

5. A mobile radio communication method using a transmitter for a CDMA system, wherein said transmitter transmits a plurality of uncompressed frames and a plurality of compressed frames within a first frame transmission period, which is formed of plural frames, and said first frame transmission period is defined as a period required to transmit a predetermined number of frames, said mobile radio communication method comprising:

generating said compressed frames through processes of compressing a plurality of uncompressed frames within said first frame transmission period, dividing each of said compressed frames into at least two parts for allocating one of said divided parts at the beginning of a frame period and the other one of said divided parts at the end of said frame period, and creating in each of said compressed frames an idle period;

transmitting said compressed frames generated by said generating,

wherein the idle periods are set fixedly in the first transmission period by the transmitter and available for monitoring a frequency component in a control channel, said control channel having a second frame transmission period and being employed in a different mobile radio communication system.