Radio base station and mobile communication system

• US 20050259663A1
• Filed: 07/28/2005
• Published: 11/24/2005
• Est. Priority Date: 02/18/2003
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Otanari, Junji, Ode, Takayoshi
• Application Number:
  US11/191,352
• Publication Number:
  US 20050259663A1
• Time in Patent Office: Days
• US Class Current: 370/395.400
• CPC Class Codes: G03C 1/005 Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein catalytic amounts of silver halide in dry silver systems or thermographic systems using noble metal compounds G03C1/494
• CPC Class Codes: G03C 2001/0854 Indium
• CPC Class Codes: G03C 7/39244 the nucleus containing only nitrogen as hetero atoms
• CPC Class Codes: G03C 7/39296 Combination of additives combination with couplers G03C7/3003
• CPC Class Codes: G03C 7/396 Macromolecular additives G03C7/388 takes precedence
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/322 by location data
• CPC Class Codes: H04W 36/324 by mobility data, e.g. speed data
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A radio base station and a mobile communication system where a hand-over request is detected and retransmission data is preferentially processed for a hand-over object terminal. A radio base station may include a buffer holding communication data for transmission to a terminal, an extractor extracting a communication request signal from a received signal, and a scheduler controlling transmission of the communication data based on an output signal of the extractor. Also a scheduler, upon detection of a hand-over request, controls transmission so as to preferentially perform the data transmission by raising an order of the data transmission for a hand-over terminal before hand-over.

Claims

1. A radio base station comprising:

a buffer holding communication data for a terminal;

an extractor extracting a communication request signal from a received signal; and

a scheduler controlling a transmission of the communication data based on an output signal of the extractor,

wherein when the scheduler detects a hand-over request the scheduler controlling the transmission changes priority of data transmission of the hand-over object terminal.

2. The radio base station of claim 1, wherein the communication data includes retransmission data and the buffer includes a retransmission buffer.

3. The radio base station of claim 1, wherein the communication data includes ordinary data and the buffer includes an ordinary buffer.

4. The radio base station of claim 2 further comprising:

an ordinary buffer;

wherein the scheduler preferentially transmitting an ordinary data in the ordinary buffer to an object terminal when the retransmission buffer is empty.

5. The radio base station of claim 1 further comprising:

an inflow controller;

wherein the scheduler controlling the inflow controller to shutdown an inflow of data for the hand-over object terminal when scheduler detect a hand-over request.

6. The radio base station of claim 1, wherein the hand-over request is provided from a radio network control station.

7. The radio base station of claim 1 further comprising:

a propagation time calculator calculating a signal propagation time between the terminal and the base station from a data transmission time to a reception time of the output signal of the extractor; and

a terminal distance calculator calculating a distance between the terminal and the base station from the propagation time;

wherein the scheduler detect the hand-over request by comparing the distance with a threshold.

8. The radio base station of claim 1, wherein the scheduler calculates a signal propagation time between the terminal and the base station from a data transmission time to a reception time of the output signal of the extractor, calculates a distance between the terminal and the base station from the propagation time, and detects the hand-over request by comparing the distance with a threshold.

9. The radio base station of claim 1 further comprising;

a terminal receiving-electric-field-strength-information extractor extracting a receiving-electric-field-strength-information calculated from a received signal, and transmitted by the terminal;

wherein the scheduler detecting the hand-over request by comparing the receiving-electric-field-strength with a threshold.

10. The radio base station of claim 1, wherein the scheduler extracts a receiving-electric-field-strength-information calculated from a received signal and transmitted by the terminal, and detects the hand-over request by comparing the receiving-electric-field-strength with a threshold.

11. The radio base station of claim 1 further comprising:

a terminal-position-information extractor extracting terminal-position-information measured and transmitted by the terminal;

a position information memory storing position information of the station itself; and

a terminal distance calculator calculating a distance between the terminal and the base station from the terminal-position-information and the position information of the station itself;

wherein the scheduler detecting the hand-over request by comparing the distance with a threshold.

12. The radio base station of claim 1, wherein the scheduler extracts terminal-position-information measured and transmitted by the terminal, stores position information of the station itself, calculates a distance between the terminal and the base station from the terminal-position-information and the position information of the station itself, and detects the hand-over request by comparing the distance with a threshold.

13. The radio base station of claim 1 further comprising:

a connected-base-station-number-information extractor extracting connected-base-station-number-information detected and transmitted by the terminal or provided from an upper layer;

wherein the scheduler detecting the hand-over request by comparing the connected-base-station-number with a threshold.

14. The radio base station of claim 1, wherein the scheduler extracts connected-base-station-number-information detected and transmitted by the terminal or provided from an upper layer, and detects the hand-over request by comparing the connected-base-station-number with a threshold

15. The radio base station of claim 1 further comprising:

a terminal-position-information extractor extracting terminal-position-information measured and transmitted by the terminal, a memory storing past one of the terminal-position-information extracted by the terminal-position-information extractor, and a moving direction calculator calculating a moving direction of the terminal from a present one of the terminal-position-information extracted by the terminal-position-information extractor and the past terminal-position-information stored in the memory;

wherein the scheduler detecting the hand-over request from the moving direction.

16. The radio base station of claim 1, wherein the scheduler extracts terminal-position-information measured and transmitted by the terminal, stores a past one of the terminal-position-information extracted, calculates a moving direction of the terminal from a present one of the terminal-position-information extracted and the past terminal-position-information, and detects the hand-over request from the moving direction.

17. The radio base station of claim 1 further comprising:

a terminal-position-information extractor extracting terminal-position-information measured and transmitted by the terminal; and

a terminal-moving-direction extractor extracting moving-direction-information of the terminal measured and transmitted by the terminal;

wherein the scheduler detecting the hand-over request from the terminal-position-information and the moving-direction-information.

18. The radio base station of claim 1, wherein the scheduler extracts terminal-position-information measured and transmitted by the terminal, extracts moving-direction-information of the terminal measured and transmitted by the terminal, and detects the hand-over request from the terminal-position-information and the moving-direction-information.

19. The radio base station of claim 1, further comprising:

a terminal-position-information extractor extracting terminal-position-information measured and transmitted by the terminal;

a memory storing a past one of the terminal-position-information extracted by the terminal-position-information extractor, and a moving speed calculator calculating a moving speed of the terminal from a present one of the terminal-position-information extracted by the terminal-position-information extractor and the past terminal-position-information stored in the memory;

wherein the scheduler detecting the hand-over request by comparing the moving speed with a threshold.

20. The radio base station of claim 1, wherein the scheduler extracts terminal-position-information measured and transmitted by the terminal, stores a past one of the terminal-position-information extracted, calculates a moving speed of the terminal from a present one of the terminal-position-information extracted and the past terminal-position-information, and detects the hand-over request by comparing the moving speed with a threshold.

21. A mobile communication system comprising:

a terminal;

a radio base station having a buffer holding communication data for the terminal, an extractor extracting a communication request signal from a received signal, and a scheduler controlling a transmission of the communication data based on an output signal of the extractor,

wherein when scheduler detect a hand-over request the scheduler controlling the buffer changes data transmission priority of hand-over object terminal.

22. A mobile communication system of claim 21, wherein the terminal calculating receiving-electric-field-strength-information from a reception signal to be transmitted;

and

the radio base station extracting the receiving-electric-field-strength-information, and detecting the hand-over request by comparing the receiving-electric-field-strength with a threshold.

23. A mobile communication system of claim 21, wherein the terminal measuring and transmitting terminal-position-information;

and

the radio base station extracting the terminal-position-information, storing position information of the station itself, calculating a distance between the terminal and the base station from the terminal-position-information and the position information of the station itself, and detects the hand-over request by comparing the distance with a threshold.

24. A mobile communication system of claim 21, wherein the terminal detecting and transmitting connected-base-station-number-information, and

the radio base station extracting the connected-base-station-number-information, and detecting the hand-over request by comparing the connected-base-station-number with a threshold.

25. The mobile communication system of claim 24, wherein the terminal detects the connected-base-station-number by site diversity when the receiving-electric-field-strength is low.

26. A mobile communication system of claim 21, wherein the a terminal calculating and transmitting terminal-position-information, and

the radio base station extracting the terminal-position-information, storing a past one of the terminal-position-information extracted, calculating a moving direction of the terminal from a present one of the terminal-position-information extracted and the past terminal-position-information, and detecting the hand-over request from the moving direction.

27. A mobile communication system of claim 21, wherein the terminal calculating and transmitting terminal-position-information and moving-direction-information of the terminal, and

the radio base station extracting the terminal-position-information, and the moving-direction-information and detecting the hand-over request from the terminal-position-information and the moving-direction-information.

28. A mobile communication system of claim 21 wherein the terminal measuring and transmitting terminal-position-information, and

the radio base station extracting the terminal-position-information, storing a past one of the terminal-position-information extracted, calculating a moving speed of the terminal from a present one of the terminal-position-information extracted and the past terminal-position-information, and detecting the hand-over request by comparing the moving speed with a threshold.

29. A radio base station comprising:

a detection means for detecting a hand-over request; and

a process means for preferentially processing retransmission data for a hand-over object terminal.