Scheduling method and system for guaranteeing real-time service quality of WiBro CPE

1. A scheduling apparatus for guaranteeing real-time service quality of Wireless Broadband (WiBro) customer premises equipment (CPE), the scheduling apparatus comprising:

a real-time protocol (RTP) packet monitoring unit for monitoring a real-time protocol (RTP) packet passing through a local area network (LAN) section and detecting a bandwidth of real-time service; and

a queue managing unit for determining a window size corresponding to the bandwidth of real-time service checked by the real-time protocol (RTP) packet monitoring unit and generating or changing a real-time service queue.

2. The scheduling apparatus of claim 1 , wherein the queue managing unit determines the window size by the following formula:

WS

=

BW

(

t

i

-

t

i

-

1

)

wherein WS denotes packet size, BW denotes bandwidth of a terminal establishing a real-time service channel, t i denotes current transmission (Tx) time, and t i-1 denotes immediately prior Tx time.

3. The scheduling apparatus of claim 1 , wherein the queue managing unit adjusts the window size by the following formula:

WScpe=WSbq+WSrtq 1+ WSrtq 2+ . . .

wherein WScpe denotes the total throughput that WiBro customer premises equipment (CPE) can process at the point of current transmission (Tx) time, and WSbq, WSrtq 1 and WSrtq 2 denote throughputs required by respective data and real-time service queues.

4. The scheduling apparatus of claim 1 , wherein when a codec for processing packets is changed, the real-time protocol (RTP) packet monitoring unit requests the queue managing unit to change the bandwidth of real-time service.

5. The scheduling apparatus of claim 4 , wherein the real-time protocol (RTP) packet monitoring unit determines whether or not a real-time service queue is generated, with reference to the packet's originating address and destination address, and the codec.

6. A scheduling method for guaranteeing real-time service quality of Wireless Broadband (WiBro) customer premises equipment (CPE), the scheduling method comprising the steps of:

monitoring, at a real-time protocol (RTP) packet monitoring unit, a real-time protocol (RTP) packet passing through a local area network (LAN) section and detecting a bandwidth of real-time service; and

determining a window size corresponding to the bandwidth of real-time service checked by the real-time protocol (RTP) packet monitoring unit and generating or changing a real-time service queue.

7. The scheduling method of claim 6 , wherein in the step of detecting the bandwidth of real-time service, the window size is determined by the following formula:

WS

=

BW

(

t

i

-

t

i

-

1

)

wherein WS denotes packet size, BW denotes bandwidth, t i denotes current transmission (Tx) time, and t i-1 denotes immediately prior Tx time.

8. The scheduling method of claim 6 , wherein in the step of detecting the bandwidth of real-time service, the window size is adjusted by the following formula:

WScpe=WSbq+WSrtq 1+ WSrtq 2+ . . .

wherein WScpe denotes the total throughput that WiBro customer premises equipment (CPE) can process at the point of current transmission (Tx) time, and WSbq, WSrtq 1 and WSrtq 2 denote throughputs required by respective data and real-time service queues.

9. The scheduling method of claim 6 , wherein the step of detecting the bandwidth of real-time service further comprises the step of:

requesting the queue managing unit to change the bandwidth of real-time service when a codec for processing packets is changed.

10. The scheduling method of claim 9 , wherein in the step of detecting the bandwidth of real-time service, it is determined whether or not a queue of real-time service is generated, with reference to the packet's originating address and destination address, and the codec.