Mobile communication system and mobile communication method

• US 8,989,076 B2
• Filed: 02/23/2010
• Issued: 03/24/2015
• Est. Priority Date: 03/16/2009
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ishikawa, Yasuaki
• Primary Examiner(s): Nawaz, Asad
• Assistant Examiner(s): ALI, SYED
• Application Number:
  US13/256,663
• Publication Number:
  US 20120003971A1
• Time in Patent Office: 1,855 Days
• Field of Search: 370/315, 455/422.1
• US Class Current: 370/315
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A mobile communication system includes a mobile station connected with a base station by radio when being in a cell formed by the base station, and configured to communicate with a counter side unit through the base station; and a relay station configured to form a limitation area. The relay station receives a downlink signal from the base station and transmits a limitation downlink signal obtained by adding information showing that it is in the limitation area to the downlink signal to the limitation area. When receiving the limitation downlink signal, the mobile station transmits an uplink signal showing a function limited state to the base station in synchronization with a downlink channel received from the base station.

Claims

1. A mobile communication system comprising:

a mobile station connected with a base station by radio when being in a cell formed by said base station, and configured to communicate with a counter side unit through said base station; and

a relay station configured to form a limitation area,

wherein said relay station receives a downlink signal from said base station and transmits a limitation downlink signal obtained by adding information showing that it is in the limitation area to said downlink signal to said limitation area,

wherein when receiving the limitation downlink signal, said mobile station transmits an uplink signal showing a function limited state to said base station in synchronization with a downlink channel received from said base station,

wherein said relay station detects synchronization timing of said downlink signal based on a reception result of said downlink signal, and determines a transmission timing of said limitation downlink signal based on the detection result of the synchronization timing,

wherein said relay station detects slot synchronization and frame synchronization by using a primary synchronization channel (PSCH), a secondary synchronization channel (SSCH), and a primary common pilot channel (P-CPICH) and generates a synchronization signal,

wherein said relay station specifies a downlink scrambling code number by using these channels,

wherein said downlink signal is spread with a downlink scrambling code and transmitted into the cell,

wherein said relay station spreads said downlink signal with a specific scrambling code different from said downlink scrambling code, and transmits the spread signal as said limitation downlink signal,

wherein notice information which contains information showing said downlink scrambling code used by said base station and information showing the scrambling code used by a peripheral base station provided around said base station is in said downlink signal, and

wherein said relay station determines the scrambling code used as said specific scrambling code based on said notice information.

2. The mobile communication system according to claim 1, wherein said mobile station limits its own function when receiving said limitation downlink signal.

3. The mobile communication system according to claim 1, wherein the function limited state is a call limited state.

4. The mobile communication system according to claim 1, wherein said relay station further determines the scrambling code used as said specific scrambling code based on said notice information which is contained in the received limitation downlink signal when receiving said limitation downlink signal from another relay station.

5. The mobile communication system according to claim 4, wherein said limitation downlink signal contains information which specifies the downlink scrambling code used in said base station, the specific scrambling code used in the other relay station, and the scrambling code used in a cell neighbor to the other relay station.

6. A mobile communication method including:

a mobile station communicating with a counter side station through said base station connected by radio, when said mobile station is in a cell formed by said base station;

a relay station forming a limitation area;

said relay station receiving a downlink signal from said base station and transmitting a limitation downlink signal obtained by adding information showing a limitation area to said downlink signal toward said limitation area;

said mobile station transmitting an uplink signal showing a function limited state to said base station in synchronization with reception of a downlink channel from said base station, when receiving said limitation downlink signal;

said relay station detecting synchronization timing of said downlink signal based on a reception result of said downlink signal, and determining a transmission timing of said limitation downlink signal based on the detection result of the synchronization timing;

said relay station detecting slot synchronization and frame synchronization by using a primary synchronization channel (PSCH), a secondary synchronization channel (SSCH), and a primary common pilot channel (P-CPICH) and generating a synchronization signal; and

said relay station specifying a downlink scrambling code number by using these channels,

wherein said downlink signal is spread with a downlink scrambling code and transmitted into the cell,

wherein the method further includes said relay station spreading said downlink signal with a specific scrambling code different from said downlink scrambling code, and transmitting the spread signal as said limitation downlink signal,

wherein notice information which contains information showing said downlink scrambling code used by said base station and information showing the scrambling code used by a peripheral base station provided around said base station is in said downlink signal, and

wherein the method further includes said relay station determining the scrambling code used as said specific scrambling code based on said notice information.