MOBILE STATION, DOWNSTREAM TRANSMISSION RATE CONTROL METHOD, AND DOWNSTREAM TRANSMISSION RATE CONTROL PROGRAM

• US 20090268616A1
• Filed: 11/14/2006
• Published: 10/29/2009
• Est. Priority Date: 11/21/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hosomi, Takahiro
• Granted Patent: US 7,835,287 B2
• Time in Patent Office: Days
• US Class Current: 370/241
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/25 with rate being modified by the source upon detecting a change of network conditions
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04W 28/0205 at the air interface dynamic wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/12 using signalling between network elements
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

An aspect of the invention provides a mobile station which can restrict an upper limit of a transmission rate according to a processing capacity in processing packet data received from a base station. The mobile station includes packet data retaining means 16 for tentatively retaining packet data received from a base station 100; reject ratio computation means 16 for computing a ratio of rejected packet data in the packet data retained by the packet data retaining means 16; transmission rate setting means 30 for setting an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation means 16; and transmission rate notification means 25 for notifying the base station 100 of the upper limit of the transmission rate set by the transmission rate setting means 30.

Claims

1. A mobile station comprising:

a packet data retaining unit which tentatively retains packet data received from a base station;

a reject ratio computation unit which computes a ratio of rejected packet data in the packet data retained by the packet data retaining unit;

a transmission rate setting unit which sets an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation unit; and

a transmission rate notification unit which notifies the base station of the upper limit of the transmission rate set by the transmission rate setting unit.

2. The mobile station according to claim 1, comprising a management table in which a packet data rate retainable by the packet data retaining unit and an upper limit of a transmission rate corresponding to the packet data rate are managed while correlated with each other,

wherein the transmission rate setting unit computes the packet data rate retainable by the packet data retaining unit based on the ratio computed by the reject ratio computation unit, refers to the management table to obtain the upper limit of the transmission rate correlated with the packet data rate based on the computed packet data rate, and sets the upper limit of the transmission rate.

3. The mobile station according to claim 2, comprising:

a BER measuring unit which measures BER (Block Error Rate);

an upper limit determination unit which determines an upper limit of a transmission rate based on the BER measured by the BER measuring unit; and

a packet data rate obtaining unit which refers to the management table to obtain a packet data rate correlated with the upper limit of the transmission rate based on the upper limit of the transmission rate determined by the upper limit determination unit,

wherein the transmission rate setting unit computes a packet data rate retainable by the packet data retaining unit by multiplying the packet data rate obtained by the packet data rate obtaining unit by the ratio computed by the reject ratio computation unit.

4. The mobile station according to claim 1, comprising a retransmission request unit which transmits a retransmission request of packet data rejected in the packet data retained by the packet data retaining unit to the base station.

5. The mobile station according to claim 1, comprising an operating state monitoring unit which monitors an operating state of the mobile station,

wherein the transmission rate setting unit sets an upper limit of a downstream transmission rate based on the operating state monitored by the operating state monitoring unit.

6. The mobile station according to claim 5, comprising a management table in which the operating state and an upper limit of a transmission rate corresponding to the operating state are managed while correlated with each other,

wherein the transmission rate setting unit refers to the management table to obtain an upper limit of the transmission rate correlated with the operating state based on the operating state monitored by the operating state monitoring unit, and sets the upper limit of the transmission rate.

7. The mobile station according to claim 5, wherein the operating state of the mobile station is a load condition in a control unit which controls the mobile station.

8. The mobile station according to claim 5, wherein the operating state of the mobile station is an operating state of an application executed by the mobile station.

9. The mobile station according to claim 1, wherein the upper limit of the downstream transmission rate is a maximum CQI (Channel Quality Indicator) value.

10. A mobile station comprising:

packet data retaining means for tentatively retaining packet data received from a base station;

reject ratio computation means for computing a ratio of rejected packet data in the packet data retained by the packet data retaining means;

transmission rate setting means for setting an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation means; and

transmission rate notification means for notifying the base station of the upper limit of the transmission rate set by the transmission rate setting means.

11. A downstream transmission rate control method performed by a mobile station including a packet data retaining unit which tentatively retains packet data received from a base station, wherein the mobile station performs:

a reject ratio computation process for computing a ratio of rejected packet data in the packet data retained by the packet data retaining unit;

a transmission rate setting process for setting an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation process; and

a transmission rate notification process for notifying the base station of the upper limit of the transmission rate set by the transmission rate setting process.

12. The downstream transmission rate control method according to claim 11, wherein the mobile station includes a management table in which a packet data rate retainable by the packet data retaining unit and an upper limit of a transmission rate corresponding to the packet data rate are managed while correlated with each other, and

in the transmission rate setting process, the packet data rate retainable by the packet data retaining unit is computed based on the ratio computed by the reject ratio computation process, the management table is referred to obtain the upper limit of the transmission rate correlated with the packet data rate based on the computed packet data rate, and the upper limit of the transmission rate is set.

13. The downstream transmission rate control method according to claim 12, wherein the mobile station performs:

a BER measuring process for measuring BER (Block Error Rate);

an upper limit determination process for determining an upper limit of a transmission rate based on the BER measured by the BER measuring process; and

a packet data rate obtaining process for referring to the management table to obtain a packet data rate correlated with the upper limit of the transmission rate based on the upper limit of the transmission rate determined by the upper limit determination process, and

in the transmission rate setting process, a packet data rate retainable by the packet data retaining unit is computed by multiplying the packet data rate obtained by the packet data rate obtaining process by the ratio computed by the reject ratio computation process.

14. The downstream transmission rate control method according to claim 11, wherein the mobile station performs a retransmission request process for transmitting a retransmission request of packet data rejected in the packet data retained by the packet data retaining unit to the base station.

15. The downstream transmission rate control method according to claim 11, wherein the mobile station performs an operating state monitoring process for monitoring an operating state of the mobile station, and in the transmission rate setting process, an upper limit of a downstream transmission rate is set based on the operating state monitored by the operating state monitoring process.

16. The downstream transmission rate control method according to claim 15, wherein the mobile station includes a management table in which the operating state and an upper limit of a transmission rate corresponding to the operating state are managed while correlated with each other, and

in the transmission rate setting process, the management table is referred to obtain an upper limit of the transmission rate correlated with the operating state based on the operating state monitored by the operating state monitoring process, and the upper limit of the transmission rate is set.

17. The downstream transmission rate control method according to claim 15, wherein the operating state of the mobile station is a load condition in a control unit which controls the mobile station.

18. The downstream transmission rate control method according to claim 15, wherein the operating state of the mobile station is an operating state of an application executed by the mobile station.

19. The downstream transmission rate control method according to claim 11, wherein the upper limit of the downstream transmission rate is a maximum CQI (Channel Quality Indicator) value.

20. A computer-readable medium storing a downstream transmission rate control program performed by a mobile station including a packet data retaining unit which tentatively retains packet data received from a base station, wherein the mobile station performs:

reject ratio computation processing for computing a ratio of rejected packet data in the packet data retained by the packet data retaining unit;

transmission rate setting processing for setting an upper limit of a downstream transmission rate based on the ratio computed by the reject ratio computation processing; and

transmission rate notification processing for notifying the base station of the upper limit of the transmission rate set by the transmission rate setting processing.

21. The computer-readable medium storing the downstream transmission rate control program according to claim 20, wherein the mobile station includes a management table in which a packet data rate retainable by the packet data retaining unit and an upper limit of a transmission rate corresponding to the packet data rate are managed while correlated with each other, and

in the transmission rate setting processing, the packet data rate retainable by the packet data retaining unit is computed based on the ratio computed by the reject ratio computation processing, the management table is referred to obtain the upper limit of the transmission rate correlated with the packet data rate based on the computed packet data rate, and the upper limit of the transmission rate is set.

22. The computer-readable medium storing the downstream transmission rate control program according to claim 21, wherein the mobile station performs:

BER measuring processing for measuring BER (Block Error Rate);

upper limit determination processing for determining an upper limit of a transmission rate based on BER measured by the BER measuring process; and

packet data rate obtaining processing for referring to the management table to obtain a packet data rate correlated with the upper limit of the transmission rate based on the upper limit of the transmission rate determined by the upper limit determination processing, and

in the transmission rate setting processing, a packet data rate retainable by the packet data retaining unit is computed by multiplying the packet data rate obtained by the packet data rate obtaining processing by the ratio computed by the reject ratio computation processing.

23. The computer-readable medium storing the downstream transmission rate control program according to claim 20, wherein the mobile station performs retransmission request processing for transmitting a retransmission request of packet data rejected in the packet data retained by the packet data retaining unit to the base station.

24. The computer-readable medium storing the downstream transmission rate control program according to claim 20, wherein the mobile station performs operating state monitoring processing for monitoring an operating state of the mobile station, and in the transmission rate setting processing, an upper limit of a downstream transmission rate is set based on the operating state monitored by the operating state monitoring processing.

25. The computer-readable medium storing the downstream transmission rate control program according to claim 24, wherein the mobile station includes a management table in which the operating state and an upper limit of a transmission rate corresponding to the operating state are managed while correlated with each other, and

in the transmission rate setting processing, the management table is referred to obtain an upper limit of the transmission rate correlated with the operating state based on the operating state monitored by the operating state monitoring processing, and the upper limit of the transmission rate is set.

26. The computer-readable medium storing the downstream transmission rate control program according to claim 24, wherein the operating state of the mobile station is a load condition in a control unit which controls the mobile station.

27. The computer-readable medium storing the downstream transmission rate control program according to claim 24, wherein the operating state of the mobile station is an operating state of an application executed by the mobile station.

28. The computer-readable medium storing the downstream transmission rate control program according to claim 20, wherein the upper limit of the downstream transmission rate is a maximum CQI (Channel Quality Indicator) value.