BASE STATION, MOBILE STATION, CONTROL METHOD, SETTING METHOD, AND COMMUNICATION SYSTEM

• US 20140133327A1
• Filed: 05/06/2013
• Published: 05/15/2014
• Est. Priority Date: 11/12/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Miyauchi, Yusuke
• Granted Patent: US 9,265,054 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: G06F 12/00 Accessing, addressing or allocating within memory systems or architectures digital input from, or digital output to record carriers, e.g. to disk storage units, G06F3/06
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

A base station communicates with a mobile station that continuously transmits a predetermined number of the same packets for predetermined time intervals. The base station includes a measuring unit that measures reception quality of packets received from the mobile station, among the predetermined number of the same packets that are continuous; and a control unit performing control of causing the mobile station to set the predetermined number based on the reception quality measured by the measuring unit.

Claims

1. A base station that communicates with a mobile station that continuously transmits a predetermined number of the same packets for predetermined time intervals, the base station comprising:

a measuring unit that measures reception quality of packets received from the mobile station, among the predetermined number of the same packets that are continuous; and

a control unit performing control of causing the mobile station to set the predetermined number based on the reception quality measured by the measuring unit.

2. The base station according to claim 1, wherein

the measuring unit measures the reception quality for a plurality of the mobile stations, respectively, and

the control unit provides the control for each of the mobile stations.

3. The base station according to claim 1, wherein

the measuring unit measures the reception quality including an error detection result of the packets.

4. The base station according to claim 3, wherein

the control unit performs control of causing the predetermined number to be set based on the number of successive times that packets of a first transmission by the mobile station are subject to a retransmission operation.

5. The base station according to claim 4, wherein

the control unit performs control of causing the predetermined number to be increased, if the number of times that the packets of the first transmission by the mobile station are subject to the retransmission operation becomes greater than or equal to a threshold value.

6. The base station according to claim 3, wherein

the control unit performs control of causing the predetermined number to be set based on the number of successive times that the packets from the mobile station are error-free within a number of transmissions fewer than the current predetermined number in succession.

7. The base station according to claim 6, wherein

the control unit performs control of causing the predetermined number to be reduced, if the number of successive times becomes greater than or equal to a threshold value.

8. The base station according to claim 3, wherein

the control unit performs control of causing the predetermined number to be set based on the number of transmissions until the packets from the mobile station become error-free.

9. The base station according to claim 8, wherein

the control unit performs control of causing the number of transmissions to be accumulated for a predetermined number of times and the predetermined number to be set based on an average value of the accumulated number.

10. The base station according to claim 9, wherein

the control unit performs control of causing the predetermined number to be increased, if the average value is larger than the current predetermined number and the predetermined number to be decreased, if the average value is smaller than the current predetermined number.

11. The base station according to claim 9, wherein

the control unit performs control of causing a number closest to the average value to be selected and the predetermined number to be set to be the selected number.

12. The base station according to claim 1, wherein

the measuring unit measures the reception quality including the number of retransmissions of the packets by the mobile station, based on an error result of a packet group transmitted in transmission time intervals of the predetermined number.

13. The base station according to claim 1, wherein

the control unit performs control of causing the predetermined number to be set based on a mobile station count of a plurality of the mobile stations.

14. The base station according to claim 13, wherein

the control unit performs control of causing a load amount of the base station due to communication with the mobile stations to be calculated based on the count of mobile stations and the predetermined number for each of the mobile stations to be set based on the calculated load amount.

15. The base station according to claim 14, wherein

the control unit performs control of causing the predetermined number for each of the mobile stations to be reduced, if the load amount exceeds a threshold value.

16. The base station according to claim 15, wherein

the control unit performs control of causing the predetermined number for each of the mobile stations to be collectively reduced until the load amount becomes less than or equal to the threshold value.

17. The base station according to claim 15, wherein

the control unit performs control causing the predetermined number for a mobile station having lower priority among the mobile stations to be preferentially reduced until the load amount becomes less than or equal to the threshold value.

18. The base station according to claim 15, wherein

the control unit performs control causing the predetermined number for a mobile station having a longer elapsed time since the last change in the predetermined number among the mobile stations to be preferentially reduced until the load amount becomes less than or equal to the threshold value.

19. The base station according to claim 1, wherein

the control unit performs control of causing the predetermined number for each mobile station of a plurality of the mobile stations to be set based on a rate of failure in allocation of resources to the mobile stations.

20. The base station according to claim 19, wherein

the control unit performs control of causing the predetermined number for each of the mobile stations to be reduced, if the rate exceeds a threshold value.

21. The base station according to claim 1, wherein

the control unit includes

a determining unit that determines the predetermined number based on reception quality measured by the measuring unit, and

a transmitting unit that transmits to the mobile station, a setting request signal indicating that the predetermined number determined by the determining unit is to be set.

22. A mobile station comprising:

a transmitting unit that continuously transmits to a base station, a predetermined number of the same packets for predetermined time intervals;

a receiving unit that receives from the base station a setting request signal that indicates the predetermined number determined by the base station and determined based on reception quality of packets transmitted by the transmitting unit among the predetermined number of the same packets that are continuous; and

a setting unit that sets the predetermined number of the transmitting unit to be the predetermined number indicated by the setting request signal received by the receiving unit.

23. A control method of a base station that communicates with a mobile station that continuously transmits a predetermined number of the same packets for predetermined time intervals, the control method comprising:

measuring reception quality of packets received from the mobile station, among the predetermined number of the same packets that are continuous; and

performing control of causing the mobile station to set the predetermined number based on the measured reception quality.

24. A setting method of a mobile station that continuously transmits a predetermined number of the same packets for predetermined time intervals to a base station, the setting method comprising:

receiving from the base station, a setting request signal that indicates the predetermined number determined by the base station and determined based on reception quality of transmitted packets among the predetermined number of the same packets that are continuous; and

setting the predetermined number of transmissions of the same packets to be the predetermined number indicated by the received setting request signal.

25. A communication system comprising:

a mobile station that continuously transmits a predetermined number of the same packets for predetermined time intervals; and

a base station performing control of causing the mobile station to set the predetermined number based on reception quality of packets received from the mobile station, among the predetermined number of the same packets that are continuous.