Radio base device reference signal, allocation method, and reference signal allocation program

• US 20060072535A1
• Filed: 09/18/2003
• Published: 04/06/2006
• Est. Priority Date: 09/20/2002
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Ito, Tadayoshi
• Granted Patent: US 8,320,343 B2
• Time in Patent Office: Days
• US Class Current: 370/348
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A CS searches in advance for information about unique words used by neighboring CSs to hold the information in a storage unit. When an LCH establishment request is made by a PS in the cell of the CS, it is confirmed whether or not there is an empty traffic slot. Further, with reference to the unique word information of the neighboring CSs of the same frequency and the same slot as the empty slot to be allocated, an unused unique word pattern is allocated.

Claims

1. A radio cell station apparatus in a mobile communication system, signals received in said mobile communication system including already-known reference signals, comprising:

search means for searching for a reference signal already used in a neighboring cell station;

storage means for storing the reference signal detected by said search means; and

reference signal allocation means for allocating, when a connection request is received from a terminal device, a reference signal different from the reference signal stored in said storage means.

2. The radio cell station apparatus according to claim 1, wherein

before the connection request is received from said terminal device, said search means receives in advance a communication signal communicated between said neighboring cell station and a terminal device communicating with said neighboring cell station, and analyzes a reference signal in use from the received communication signal, and

said storage means stores and holds said analyzed reference signal.

3. The radio cell station apparatus according to claim 2, wherein

said search means searches for the reference signal used in said neighboring cell station for each traffic slot allocated to said terminal device.

4. A radio cell station apparatus in a mobile communication system, signals transmitted/received in said mobile communication system including already-known reference signals, comprising:

storage means for storing a plurality of reference signals different from each other; and

reference signal allocation means for randomly selecting, when a connection request is received from a terminal device, a reference signal from said storage means based on a cell station number assigned to each cell station and allocating the reference signal to said terminal device.

5. The radio cell station apparatus according to claim 4, wherein

said reference signal allocation means allocates an i-th reference signal corresponding to value i of a reminder of division of said cell station number by total number m of reference signals stored in said storage means, where m is a natural number and i is a natural number of at most m.

6. A reference signal allocation method performed by a radio cell station apparatus in a mobile communication system, signals received in said mobile communication system including already-known reference signals, comprising the steps of:

searching for a reference signal already used in a neighboring cell station;

storing said reference signal detected; and

allocating, when a connection request is received from a terminal device, a reference signal different from said reference signal stored.

7. The reference signal allocation method according to claim 6, further comprising the steps of:

before the connection request is received from said terminal device, receiving in advance a communication signal communicated between said neighboring cell station and a terminal device communicating with said neighboring cell station, and analyzing a reference signal in use from the received communication signal; and

storing said analyzed reference signal.

8. The reference signal allocation method according to claim 7, further comprising the step of searching for the reference signal used in said neighboring cell station for each traffic slot allocated to said terminal device.

9. A reference signal allocation method performed by a radio cell station apparatus in a mobile communication system, signals transmitted/received in said mobile communication system including already-known reference signals, comprising the steps of:

storing a plurality of reference signals different from each other; and

randomly selecting, when a connection request is received from a terminal device, a reference signal from said plurality of reference signals based on a cell station number assigned to each cell station and allocating the reference signal to said terminal device.

10. The reference signal allocation method according to claim 9, further comprising the step of allocating an i-th reference signal corresponding to value i of a reminder of division of said cell station number by total number m of said reference signals stored, where m is a natural number and i is a natural number of at most m.

11. A reference signal allocation program performed by a radio cell station apparatus in a mobile communication system, signals received in said mobile communication system including already-known reference signals, and said program performed for a computer to execute the steps of:

searching for a reference signal already used in a neighboring cell station;

storing said reference signal detected; and

allocating, when a connection request is received from a terminal device, a reference signal different from said reference signal stored.

12. The reference signal allocation program according to claim 11, said program performed for the computer to further execute the steps of:

before the connection request is received from said terminal device, receiving in advance a communication signal communicated between said neighboring cell station and a terminal device communicating with said neighboring cell station, and analyzing a reference signal in use from the received communication signal; and

storing said analyzed reference signal.

13. The reference signal allocation program according to claim 12, said program performed for the computer to further execute the step of searching for the reference signal used in said neighboring cell station for each traffic slot allocated to said terminal device.

14. A reference signal allocation program performed by a radio cell station apparatus in a mobile communication system, signals transmitted/received in said mobile communication system including already-known reference signals, and said program performed for a computer to execute the steps of:

storing a plurality of reference signals different from each other; and

randomly selecting, when a connection request is received from a terminal device, a reference signal from said plurality of reference signals based on a cell station number assigned to each cell station and allocating the reference signal to said terminal device.

15. The reference signal allocation program according to claim 14, said program performed for the computer to further execute the step of allocating an i-th reference signal corresponding to value i of a reminder of division of said cell station number by total number m of said reference signals stored, where m is a natural number and i is a natural number of at most m.