KR100649876B1 - Streaming server and streaming method thereof - Google Patents

Abstract

A streaming server and a streaming method thereof are provided to enable the streaming server having wireless AV(Audio Video) multimedia contents to control an EBR(Encoding Bit Rate) when streaming the independent contents to at least one streaming client, thus the overall streaming service quality is guaranteed. While streaming contents at preset EBRs for each of at least one of streaming clients connected through networks, a streaming server calculates service time which is channel occupancy time per unit time of each streaming client(S501). The server calculates the overall service time in addition to the service time for each of the at least one of the streaming clients(S503). If the overall service time is bigger than a predetermined least upper bound value, the server reduces the overall service time by down-controlling an EBR set for a selected streaming client among the at least one of the streaming clients(S505-S511).

Description

Streaming server and streaming method

1 is a block diagram of a streaming system including a streaming server according to the present invention;

2 is a diagram illustrating a format of a PSDU for describing LENGTH;

3 is a flow chart provided in the description of how to select a particular streaming client to lower the currently provided EBR for improving the overall streaming service;

4 is a flow chart provided in the description of a method of selecting a specific streaming client to raise the currently provided EBR to improve the overall streaming service, and

5 is a flowchart provided to explain the streaming method of the streaming server of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a streaming server and a method for streaming the same, wherein a streaming server having wireless AV multimedia content streams independent content to at least one streaming client. The present invention relates to a streaming server and a method of streaming the same, which guarantees a streaming quality of service by adjusting.

Recently, AV streaming products such as wireless TVs have been developed and marketed. Wireless AV streaming products are being released in mobile form using the wireless characteristic. In the WLAN environment, the wireless channel environment is not always constant due to the nature of wireless, and it continuously changes according to time and place.

In the case of data communication, the delay time is increased due to the change of the wireless environment, and even if the throughput is reduced, only the data transmission time is increased, and the service itself can be continuously provided. However, wireless AV streaming products such as wireless TVs require serious problems such as transmission delay, screen freeze, or black noise.

Conventionally, when providing an AV multimedia streaming service to a terminal to which a content server is connected, content of the same quality (Encoding Bit Rate) has been provided. If the WLAN environment is good, such a method may be appropriate. However, as one of the WLAN terminals is far from the server, when the normal service cannot be received, only the corresponding WLAN terminal may not be affected by the normal service, but the service of the other WLAN terminal may be affected. That is, the wireless channel rate (CR) that is communicated between the wireless LAN terminal that is far from the server is set low, and occupies the channel for more time to maintain the original quality. The available radio channel resources are reduced.

Therefore, a product that transmits AV wirelessly must appropriately cope with changes in the wireless environment occurring during operation in order to ensure the quality of service.

Summary of the Invention An object of the present invention is to provide a total streaming service by adjusting an encoding bit rate (EBR) in a streaming server having wireless AV (audio video) multimedia content to stream independent content to at least one streaming client. The present invention provides a streaming server and a streaming method for guaranteeing quality.

In order to achieve the above object, the streaming method of a streaming server according to the present invention includes streaming content at a predetermined EBR (Encoding Bit Rate) for each of at least one streaming client connected through a network. Calculating a service time which is a channel occupancy time per unit time per client, adding a service time for each of the at least one streaming client, and calculating a total service time; and wherein the total service time is a predetermined upper limit threshold (DOWN_SVC_TIME). If greater, the step of reducing the overall service time by adjusting the EBR set to the selected one of the at least one streaming client down.

Here, the network may be one of a wireless LAN, Bluetooth, Zigbee, and UWB (Ultra Wide Band). When the network is a wireless LAN, the service time is determined according to the EBR. It may be a transmission time of data to be transmitted per unit time.

The streaming method of the streaming server may further include setting an allocating time allocated by dividing the upper limit threshold value by a predetermined method for each of the at least one streaming client, and reducing the overall service time. In addition, among the at least one streaming client, a streaming client having a maximum value obtained by subtracting an allocation time for itself from a service time may be selected.

In addition, the step of reducing the total service time may include that the strength of the received signal is the minimum among two or more streaming clients whose maximum service value is obtained by subtracting the allocation time for the service time of the at least one streaming client. You can choose.

In addition, the reducing of the total service time may exclude from the selection that the preset EBR is the minimum EBR among the at least one streaming client.

The streaming method of the streaming server may further include selecting one of the at least one streaming client when the total service time is smaller than a predetermined lower limit threshold value UP_SVC_TIME that is set smaller than the upper limit threshold value and the selected streaming. The method may further include adjusting an EBR set for the client.

Furthermore, the method may further include setting an allocating time allocated to each of the at least one streaming client by dividing the upper limit by a predetermined method, and the selecting of the at least one streaming client may include: You can select the streaming client with the maximum value minus your service time.

The selecting may include selecting at least one of the at least one streaming client from among the at least two streaming clients whose service time is subtracted from the allocation time set for the at least one of the at least one streaming client. have.

In the selecting, the selected EBR is the maximum EBR among the at least one streaming client.

In addition, the streaming method of the streaming server, when a new streaming client makes a streaming service request, in consideration of whether the total service time changed by the new streaming client is greater than the upper limit threshold, and accepts the service request. Streaming method of a streaming server, characterized in that it further comprises.

The streaming server according to another embodiment of the present invention may stream predetermined content to at least one connected streaming client according to the streaming method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a streaming system including a streaming server according to the present invention.

The application of the streaming server 110 of the present invention may vary. Among them, the streaming server 110 of the present invention operates as a streaming server such as a set-top box for a wireless TV, and is a streaming client. AV (AudioVideo) multimedia content can be streamed using a TV or the like.

The streaming server 110 of the present invention operates as a wireless multimedia content server, while considering the state of each of a plurality of connected WLAN terminals, the quality of content streaming provided to each WLAN terminal (EBR: Encoding Bit Rate). ) To keep the entire streaming service at an appropriate quality.

Referring to FIG. 1, a streaming server 110 and first to fourth streaming clients 171, 173. 175.177 are connected to the network 150.

Network 150 formed by the streaming server 110 of the present invention can be applied to a variety of wireless standards, such wireless standards (Wireless LAN, Bluetooth (Bluetooth), Zigbee (Zigbee) or UWB (Ultra Wide Band) ), And the like. However, hereinafter, a case where the streaming server 110 operates as an access point (AP) in accordance with the IEEE 802.11 WLAN standard will be described.

The streaming server 110 includes a memory 111, a user interface 113, a physical layer processor 119, a MAC (Media Access Control) controller 121, and a controller 123.

The memory 111 includes various active and inactive memories. The memory 101 is a program ROM for storing various control programs and application programs of the controller 123 and a ROM for storing information generated from or transmitted from the MAC controller 121. Or random access memory (RAM).

The user interface unit 113 includes a display unit 115 and an input unit 117.

The display unit 115 displays various information transmitted from the control unit 123 to the user, and the input unit 117 receives various control commands and commands regarding various selections and settings from the user and transmits them to the control unit 123.

The physical layer processing unit 119 includes a modem (not shown) and a radio frequency (RF) unit (not shown), and the physical layer on the network protocol such as accessing a wireless network and modulating packets transmitted and received. Plays the role of.

The MAC controller 121 is connected to the physical layer to perform media access control on the network, and transmits and receives data packets with the first to fourth streaming clients 171, 173. 175. 177, which are counterpart wireless LAN devices. The MAC controller 121 may include a separate memory (not shown).

In general, the MAC controller 121 and the physical layer processor 119 may be mounted and separated from the streaming server 110 in the form of a separate WLAN card. In addition, it may be installed as a separate external device and connected to the streaming server 110.

The controller 123 includes a network processor 125 and an application processor 127, and controls the overall functions of the streaming server 110. In addition, the controller 123 provides various interfaces with the user through the user interface 103.

By controlling the MAC controller 121, the network processor 125 controls a wireless LAN protocol such as IP (Internet Protocol) and UDP / TCP (User Datagram Protocol / Transmission Control Protocol) for data communication with a device (not shown). Perform various controls accordingly.

The network processor 125 collects WLAN information on each of the connected streaming clients. The WLAN information includes a received signal strength of each streaming client and a WLAN channel rate (CR) currently being transmitted. Here, the received signal strength corresponds to RSSI (Received Signal Strength Indication) indicated in dBm units.

The application processor 127 may include a device (not shown) connected to the streaming server 110 such as a wireless TV, a wireless digital disc (DVD), a wireless set top box, a wireless voice over internet protocol (VoIP). In the case of one of a telephone and a wireless speaker, various applications for supporting functions of a device (not shown) are processed. That is, the A / V streaming control of the present invention is performed.

The application processor 127 controls to stream the predetermined multimedia content at a predetermined quality according to a request of the first to fourth streaming clients 171, 173.175.177. The application processor 127 may provide different contents for the connected clients, and vary with different encoding bit rates (EBRs) (hereinafter referred to as 'EBR') according to the contents or the connected clients. It provides bit rate (VBR).

First, the application processing unit 127 is based on the predetermined WLAN information provided by the network processing unit 125, and uses the total radio resources, that is, the total service time (i.e., the entire service time, used by the first to fourth streaming clients 171, 173. 175. 177). Calculate the service time. Here, the service time refers to a wireless channel occupancy time per unit time (in this case, 1 second) of the streaming client while the streaming server 110 streams the content to the streaming client, and the unit is microseconds. to be.

This overall service time may be overloaded or relaxed relative to available radio resources. The application processor 127 considers two reference values to determine the radio resource utilization based on the overall service time. One is the upper limit boundary value DOWN_SVC_TIME, and the other is the lower limit boundary value UP_SVC_TIME.

The upper boundary value is a constant value of 1,000,000 ms or less and is a boundary value that determines whether or not to lower the EBR of the content in service. It is difficult to accurately predict the WLAN environment, and even in the WLAN environment without interference, PER is present in several percent, so the margin is defined with a certain margin.

For example, the upper limit may be defined as 900,000 ms with a margin of 100,000 ms.

The lower limit value is a constant value of 1,000,000 Hz or less and is a limit value for determining whether to increase the EBR of the content in service.

If the total service time is greater than the upper limit, the application processor 127 determines that the radio resource utilization is overloaded, and selects a specific streaming client to lower the EBR to lower the overall resource utilization, thereby reducing the quality of the entire streaming service. Prevents it from lowering.

If the overall service time is lower than the lower limit, the application processor 127 determines that the radio resource utilization is very low, and selects a specific streaming client to raise the EBR to increase overall resource utilization.

Since the application processor 127 knows the amount of available radio resources on the basis of the total service time, when a new streaming client (not shown) makes a service request, the application processing unit 127 first checks whether the entire system does not affect the service. You can accept the request. If it is determined that the service currently being provided to another streaming client causes a serious obstacle when accepting the request of the new streaming client, the application processing unit 127 rejects the service request of the new streaming client.

Hereinafter, a method of calculating the total service time will be described. The total service time is obtained by adding up the service times of each streaming client. Thus, starting with obtaining the service time of each of the first to fourth streaming clients 171, 173. 175. 177.

The basic policy of the wireless AV multimedia streaming service mentioned in the present invention is to use an equal wireless share for each streaming client. That is, the streaming clients receiving the streaming service from the streaming server 110 are limited in the WLAN usage rate that they can occupy and are determined in a predetermined manner.

For example, when the upper limit is 800,000 mW, if the first to fourth streaming clients 171, 173.175.177 use the radio resources evenly, the WLAN resource available to each streaming client equals 800,000 mW. It is best to use 200,000 당 per second divided into four.

Since the application processor 127 knows the EBR of the content provided to the first to fourth streaming clients 171, 173. 175. 177, the application processor 127 may know the amount of data to be transmitted at one second intervals. Based on this data, the application processor 127 may calculate the service time by applying the channel rate of each streaming client received from the network processor 125. In other words, the service time of each streaming client is determined by the Encoding Bit Rate (EBR) and the WLAN Channel Rate (CR) of the content under service.

Therefore, the service time for each streaming client can be obtained by Equation 1 below. Here, since the radio transmission time is much smaller than 1 ms, it can be ignored. In addition, the PER (Packet Error Rate) generated in the WLAN is ignored in calculation. Here, the service time may vary according to the modulation and demodulation scheme of the WLAN, and various modulation and demodulation schemes may be used. However, an embodiment of the present invention uses an orthogonal frequency-division multiplexing (OFDM) scheme. Based on this matter, the service time can be obtained through Equations 1 to 3 below.

Equation 1 below is a time taken to complete transmission of user data (User Data, or payload) transmitted in one UDP packet.

TX_TIME _TOTAL = DIFS + T _BACKOFF + (TX_TIME _PHY of DATA) + SIFS + (TX_TIME _PHY of ACK)

Here, TX_TIME _TOTA is the total time required to transmit the MSDU (Mac Service Data Unit), TX_TIME _PHY of DATA is the time required to transmit the user data, TX_TIME _PHY of ACK is the time taken to receive the ACK of the streaming client. In other words, TX_TIME _PHY is a time required for transmitting an OFDM symbol or ACK to the WLAN as shown in Equation 2 below.

TX_TIME _PHY = T _PREAMBLE + T _SIGNAL + T _SYM × Ceiling ((SERVICE + 8 × LENGTH + Tail) / N _DBPS )

Here, Ceiling () denotes rounding process.

Hereinafter, with reference to the following Table 1, Table 2, and FIG. 2, each variable of Formula (1) and Formula (2) is demonstrated. First, Table 1 below is a description of the variables used in the equation (1).

variable value DIFS 34㎲ = SIFS + (2 × SlotTime) However, SIFS = 16㎲, SlotTime = 9㎲ T _BACKOFF 72㎲ = 8 × SlotTime except SlotTime = 9㎲ SIFS 16㎲

DIFS is Distributed Inter Frame Space and SIFS is Short Inter Frame Space. T _BACKOFF is the backoff time. It is assumed that there is no retry, and assuming that the backoff counter is 8, which is half of the CWmin value on average. However, this may vary depending on the number of connected streaming clients.

In Equation 2, T _PREAMBLE is 16 ms as a time required to transmit a physical layer convergence protocol (PLCP) preamble, and T _SIGNAL is 4 ms as a time required to transmit a SIGNAL. T _SYM is a time required to transmit one OFDM symbol, which is 4 ms. SERVICE is a null bit used for initialization of the scrambler and is 16 bits. Therefore, Equation 2 can be expressed as follows.

TX_TIME _PHY = T _PREAMBLE + T _SIGNAL + T _SYM × Ceiling ((16 + 8 × LENGTH + 6) / N _DBPS )

N _DBPS is the size of data that can be transmitted in one OFDM symbol according to the channel rate of IEEE 802.11a, and is shown in Table 2 below.

Channel rate N _DBPS (Data bits per OFDM symbol) 6 24 bits 9 36 bits 12 48 bits 18 72 bits 24 96 bits 36 144 bits 48 192 bits 54 216 bits

LENGTH is a size of a PHY Service Data Unit (PSDU), which will be described below with reference to FIG. 3.

FIG. 2 is a diagram illustrating a format of a PHY Protocol Data Unit (PPDU) for describing LENGTH, in which LENGTH includes a MAC header (24 bytes), a LLC (Logical Link Control) header (8 bytes), and an IP (Internet Protocol). Header (20 bytes), User Datagram Protocol (UDP) header (8 bytes), Payload, and FCS () (4 bytes), among which the payload portion is variable.

Accordingly, the service time for each streaming client is obtained by the following equation.

Service time = TX_TIME _TOTAL × EBR / (Size of payload × 8)

The payload is in bytes, so multiply it by eight.

For example, suppose that a service time of the second streaming client 173 is obtained. _Assuming that the payload of the user data portion is 1472 bytes, the channel rate is 54Mbps (N _DBPS is 216 bits), the provided EBR is 1Mbps, and UDP, the service time is as follows.

First, the TX_TIME _PHY of DATA is 248 ms as follows.

TX_TIME _PHY of DATA = 16 + 4 + 4 × Ceiling ((16 + 8 × (24 + 8 + 20 + 8 + 1472 + 4) + 6) / 216) = 20 + 4 x 57 = 248 (㎲)

In addition, for the TX_TIME _PHY of ACK, IEEE 802.11a basic rate generally supports 6, 9, 12, 18, 24 Mbps. Therefore, when operating at a channel rate of more than 24Mbps, the channel rate of the ACK is 24Mbps (N _DBPS is 96 bits). Therefore, TX_TIME _PHY of ACK becomes 28 ms as follows.

TX_TIME _PHY of ACK = 16 + 4 + 4 × Ceiling ((16 + 8 × 14 + 6) / 96)

                 = 20 + 4 × 2 = 28 (㎲)

Therefore, TX_TIME _TOTAL required to transmit 1472 bytes of user data once becomes 398 ms as follows.

TX_TIME _TOTAL = 34 + 72 + 248 + 16 + 28 = 398 (㎲)

Therefore, the service time of the second streaming client 173 is 33,814 ms.

In this manner, the service times of the first to fourth streaming clients 171 and 173.175.177 are obtained, respectively.

Table 3 below is a result of calculating service time according to EBR and channel rate (CR), and the unit is ㎲. The calculation result of Table 3 is to transmit the content in the UDP packet, the size of the user data of one UDP packet to 1472 bytes. In addition, the transmission rate of the ACK applies a basic rate.

In this way, the total service time can be calculated by adding up the service times obtained for each streaming client.

Hereinafter, referring to FIG. 3, a method of determining a streaming client to lower the currently provided EBR as the calculated total service time is greater than the upper limit threshold will be described.

3 is a flow chart provided in the description of a method of selecting a particular streaming client to lower the currently provided EBR to improve the overall streaming service.

The application processor 127 sets an allocated time RESERVED_TIME in consideration of a streaming client that is currently streaming service. Here, the allocation time is a channel time that each streaming client can occupy. For example, since the upper limit threshold is 800,000 ms and the first to fourth streaming clients 171, 173.175.177 are provided with services, each streaming client can equally set an allocation time of 200,000 ms per second. However, if you give priority among streaming clients and differentiate by user such as premium service, RESERVED_TIME can be set differently. However, the sum of the allocation time for each streaming client does not exceed the upper limit (S301).

The application processor 127 selects the streaming client having the largest result of subtracting RESERVED_TIME from the service time of the first to fourth streaming clients 171, 173.175.177. However, among the streaming clients, the lowest EBR (see Table 4 below) is excluded from the selection (S303).

The application processor 127 determines whether two or more streaming clients are selected as a result of comparing the service time and RESERVED_TIME (S305). If a plurality of clients are selected, the application processor 127 determines that the received signal strength (RSSI) is the smallest among the selected clients. Choose. The received signal strength is the strength of the wireless signal received by the streaming server 110 from each streaming client, and provides information for estimating the distance between the streaming server 110 and each streaming client. For example, assuming that the RSSI value of the first streaming client 171 is -30 and the RSSI value of the second streaming client 173 is -40, the first streaming client 171 is the second streaming client 173. Compared to this, it means that the distance to the server is closer or there are fewer obstacles to the WLAN environment. Smaller RSSI values mean that the WLAN environment is more likely to get worse. Therefore, the smallest RSSI value is selected among the plurality of selected streaming clients (S307).

If the RSSI values are the same, one streaming client may be arbitrarily selected from the current candidates. In this way, if the calculated total service time is greater than the upper bound, the streaming client to lower the currently provided EBR is determined.

The application processor 127 lowers the EBR of the final stream client selected in step S305 or S307 of FIG. 3 by one step. Hereinafter, the adjustment value of the EBR of the selected streaming client is called a 'target EBR'. Here, the target EBR is one step lower than the current one, but there are various methods. The steps of EBR provided to the streaming client are different for each application. These steps can be set in a variety of ways, the following Table 4 shows an example.

step Encoding Bit Rate (Mbps) Converted to 1472 UDP packets  Remarks One 1 (125,000 bytes / sec)  84 × 1472 + 1352 Lowest EBR 2 2 (250,000 bytes / sec) 169 × 1472 + 1232 3 3 (375,000 bytes / sec) 254 × 1472 + 1112 4 4 (500,000 bytes / sec) 339 × 1472 + 992 5 5 (625,000 bytes / sec) 424 × 1472 + 872 Top EBR

Hereinafter, referring to FIG. 4, a method of determining a streaming client to increase an EBR currently being provided as the calculated total service time is smaller than a lower limit threshold will be described.

FIG. 4 is a flowchart provided to explain a method of selecting a specific streaming client to raise an EBR currently being provided to improve the overall streaming service.

As in step S301 of FIG. 3, an allocation time is set (S401), and a streaming client having the largest (RESERVED_TIME-service time) as a result of subtracting the service time currently being used from the RESERVED_TIME set for each streaming client is selected. However, among the streaming clients, the highest EBR (see Table 4) is excluded from the candidate (S403).

The application processor 127 determines whether two or more streaming clients are selected as a result of the selection in step S403 (S405). If a plurality of clients are selected, the application processing unit 127 selects the one having the largest received signal strength (RSSI) value among the selected clients. (S407).

If the received signal strengths of the selected plurality of streaming clients are also the same, one streaming client may be arbitrarily selected from the currently selected ones.

In this way, if the calculated total service time is less than the lower bound, the streaming client is determined to increase the currently provided EBR.

The application processor 127 increases the EBR of the final stream client selected in step S405 or S407 of FIG. 4 to the target EBR. This step can use the steps in Table 4.

According to an embodiment, the 'predicted total service time' is calculated by estimating the total service time after raising the EBR of the last streaming client selected in step S405 or S407 by one step, and comparing whether the predicted total service time is not greater than the upper bound. do. If the predicted total service time is greater than the upper bound, the selected streaming client may be deselected and the streaming client to increase the EBR may be selected again.

5 is a flowchart provided to explain the streaming method of the streaming server of the present invention. Hereinafter, a streaming method of a streaming server of the present invention will be described in general with reference to FIGS. 1 to 5.

The application processor 127 receives the WLAN information from the network processor 125. The WLAN information includes channel rates and received signal strengths of the first to fourth streaming clients 171, 173. 175. 177 connected to the streaming server 110 (S501).

The application processor 127 calculates a service time used by each streaming client based on the WLAN information received from the network processor 125, and calculates an overall service time based on this (S503).

The application processor 127 first determines whether the total service time is greater than the upper limit threshold DOWN_SVC_TIME (S505), and if so, selects a specific streaming client to lower the corresponding EBR (S507).

The application processor 127 selects and adjusts the EBR provided to the selected streaming client as the target EBR (S509 and S511).

If the total service time is not greater than the upper limit threshold as a result of the determination in step S505, the application processor 127 determines whether the total service time is smaller than the lower limit UP_SVC_TIME (S513).

As a result of the determination in step S513, if the total service time is less than the lower limit, the streaming client to select the corresponding EBR is selected, and the EBR currently provided to the selected streaming client is adjusted to the target EBR (S515 to S519).

In addition, as a result of the determination in step S513, if the total service time is greater than the upper limit, the streaming service is provided at an appropriate level, the application processing unit 127 waits without performing the step of FIG. 5 for a predetermined time, You can do it again.

According to the above method, the streaming method of the streaming server 110 of the present invention is performed.

The invention can be implemented in methods, devices and systems. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored on a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

Media that can be processed by a microprocessor include those capable of transmitting and storing information such as electronic circuits, semiconductor memory devices, ROMs, flash memories, EEPROMs, floppy disks, optical disks, hard disks, optical fibers, wireless networks, and the like. Include. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the above-described specific embodiment, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described above, according to the present invention, when the streaming server streams multimedia content to a plurality of clients, it is possible to stably maintain the overall streaming service quality.

Basically, the streaming service can guarantee the quality of the streaming service even though the streaming service is based on the uniform distribution of radio resources among a plurality of clients.

Claims (12)

Calculating a service time which is a channel occupancy time per unit time of each streaming client while streaming content at a predetermined encoding bit rate (EBR) for each of at least one streaming client connected through a network; Calculating a total service time by adding service times for each of the at least one streaming client; And If the total service time is greater than a predetermined upper limit threshold (DOWN_SVC_TIME), reducing the overall service time by adjusting the EBR set to the selected streaming client among the at least one streaming client; streaming of the streaming server comprising the Way. The method of claim 1, The network is a streaming method of a streaming server, characterized in that one of a wireless LAN, Bluetooth, Zigbee and UWB (Ultra Wide Band). The method of claim 1, If the network is a wireless LAN, the service time is a streaming method of a streaming server, characterized in that the transmission time of the data required to be transmitted per unit time according to the EBR. The method of claim 1, Setting an allocating time allocated for each of the at least one streaming client by dividing the upper limit boundary value by a predetermined method; The reducing of the total service time may include selecting a streaming client having a maximum value obtained by subtracting an allocation time of the service time from the at least one streaming client. The method of claim 4, wherein The reducing of the total service time may include selecting one of the at least one streaming client whose strength of the received signal is the minimum among two or more streaming clients whose maximum service value is obtained by subtracting the allocation time for the service. Streaming method of the streaming server, characterized in that. The method of claim 1, Reducing the overall service time, Streaming method of the streaming server, characterized in that the selected EBR of the at least one streaming client is the minimum EBR excluded from the selection. The method of claim 1, Selecting one of the at least one streaming client when the total service time is less than a predetermined lower limit threshold value UP_SVC_TIME set smaller than the upper limit threshold value; And The method further comprises the step of adjusting the EBR set to the selected streaming client. The method of claim 7, wherein Setting an allocating time allocated for each of the at least one streaming client by dividing the upper limit boundary value by a predetermined method; The selecting of the streaming method may include selecting a streaming client having a maximum value obtained by subtracting its service time from an allocation time set for the at least one streaming client. The method of claim 8, The selecting of the at least one streaming client may include selecting one of the at least one streaming client having the minimum strength of a received signal among two or more streaming clients having a maximum subtracted their service time. Streaming server streaming method. The method of claim 7, wherein The selecting of the streaming method as claimed in claim 1, wherein the predetermined EBR is the maximum EBR among the at least one streaming client. The method of claim 1, When the new streaming client makes a streaming service request, accepting the service request in consideration of whether the total service time changed by the new streaming client is greater than the upper limit threshold; Streaming server streaming method. A streaming server for streaming predetermined content to at least one connected streaming client according to the streaming method of claim 1.

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