MOBILE RADIO COMMUNICATION SYSTEM, COMMUNICATION APPARATUS APPLIED IN A MOBILE RADIO COMMUNICATION SYSTEM, AND MOBILE RADIO COMMUNICATION METHOD

• US 20080062950A1
• Filed: 10/31/2007
• Published: 03/13/2008
• Est. Priority Date: 04/23/1998
• Status: Abandoned Application

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Murai, Hideshi, Yano, Yasuhiro, VOYER, Nicolas
• Application Number:
  US11/931,499
• Publication Number:
  US 20080062950A1
• Time in Patent Office: Days
• US Class Current: 370/342
• 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 36/14 Reselecting a network or an air interface
• 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 (1) transmitting a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode within a first frame transmission period, which is formed of plural frames and required to transmit a predetermined number of frames, and a receiver (2) receiving said frames and said compressed frames transmitted by said transmitter (1), said transmitter (1) comprises

an interleaver (13) which performs interleaving of data in a frame in bit units;

a spreading unit (14), in which a plurality of frames processed by said interleaver (13) are inputted, wherein said spreading unit (14) compresses frames within said first frame transmission period to produce compressed frames, and divides each of said compressed frames into two divided parts, and 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 whose length is half as much as that of each frame or less, in a compressed mode; and

a radio frequency transmitter (15) which transmits said compressed frames processed by said spreading unit (14) in said compressed mode;

and said receiver (2) comprises

a radio frequency receiver which monitors, within said idle period in each of said compressed frames, 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.

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

3. A receiver used in a mobile radio communication system employing a CDMA method, wherein a transmitter (1) of said mobile radio communication system transmits a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode during a first frame transmission period, which is formed of plural frames, performs interleaving of data to be transmitted in bit units, and said first frame transmission period is defined as a period required to transmit a predetermined number of frames, said receiver comprises:

a radio frequency receiver (25), to which said compressed frames received by an antenna are inputted, for monitoring a frequency component in a control channel within an idle period in each of said compressed frames within said first frame transmission period, wherein said control channel has a second transmission period which is employed in a different mobile radio communication system, and each of said compressed frames has an idle period whose length is half as much as that of each frame or less, and each of said compressed frames is divided into two divided parts such that one of the divided parts is allocated at the beginning of a frame period and the other one of said divided parts is allocated at the end of said frame period.

4. A transmitter used in a mobile radio communication system employing a CDMA method, wherein said transmitter (1) transmits a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode within a first frame transmission period, which is formed of plural frames, and said first transmission period is defined as a period required to transmit a predetermined number of frames,

said transmitter (1) comprises:

an interleaver (13) which performs interleaving of data in a frame in bit units; and

a spreading unit (14), in which a plurality of frames processed by said interleaver (13) are inputted, wherein said spreading unit (14) compresses 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 whose length is half as much as that of each frame or less, in a compressed mode; and

a radio frequency transmitter (15) which transmits said compressed frames processed in said spreading unit (14) in said compressed mode.

5. A mobile radio communication method used in a CDMA system, wherein said system includes a transmitter (1) which performs interleaving of data to be transmitted in bit units, and transmits a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode within a first frame transmission period, which is formed of plural frames, and a receiver (2) that receives said frames and said compressed frames transmitted by said transmitter (1), said first frame transmission period is defined as a period required to transmit a predetermined number of frames,

said mobile radio communication method comprises:

steps, executed by said transmitter (1), for

compressing 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;

allocating in each of said frames an idle period whose length is half as much as that of each frame or less;

transmitting said frames with said idle period to said receiver (2); and

a step, executed by said receiver (2) for monitoring frequency components in a control channel having a second frame transmission period within said idle period allocated in each of said compressed frames, wherein said second frame transmission period is employed in a different mobile radio communication system.

6. A mobile radio communication method used in a receiver (2) for a CDMA system, wherein a transmitter (1) of said mobile radio communication system transmits a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode during 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, performs interleaving of data to be transmitted in bit units, said mobile radio communication method comprises:

receiving said compressed frames within said first frame transmission period, each of said compressed frames having an idle period whose length is half as much as that of each frame or less and being divided into at least two parts such that one of said divided frames is allocated at the beginning of a frame period and the other one of said divided parts is allocated at the end of said frame period; and

monitoring a frequency component in a control channel within said idle period in each of said compressed frames, wherein said control channel has a second frame transmission period which is employed in a different mobile radio communication system.

7. A mobile radio communication method used in a transmitter (1) for a CDMA system, wherein said transmitter (1) transmits a plurality of frames in a normal mode and a plurality of compressed frames in a compressed mode 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 comprises:

generating said compressed frames through processes of compressing a plurality of frames within said first 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 whose length is half as much as that of each frame or less, and;

transmitting said compressed frames generated by said generating step.