KR20070089287A - Apparatus and method for power controll in mobile communication system - Google Patents

Abstract

An apparatus and a method for controlling power in a mobile communication system are provided to separately manage power for the traffic of a stream class through a HSDPA(High Speed Downlink Packet Access) service. An apparatus for controlling power in a mobile communication system comprises the followings: a call control unit(102) which checks whether traffic connection can be performed by checking a preset power amount for the traffic connection of a stream class through an HSDPA(High Speed Downlink Packet Access) service if an RAB(Radio Access Bearer) assignment request message for requesting connection of traffic of the stream class is received through the HSDPA service from a CN(Core Network)(120), and then controls so as to connect the traffic to an HS-DSCH(High Speed-Downlink Shared CHannel) if the traffic connection is possible through the HSDPA service; and a traffic control unit(108) which connects the traffic to a base station, a DCH(Dedicated CHannel), or the HS-DSCH under control of the call control unit.

Description

Power control device and method for mobile communication system {APPARATUS AND METHOD FOR POWER CONTROLL IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a configuration of a mobile communication system for managing power for call control acceptance by High Speed Downlink Packet Access (HSDPA) when a traffic of a stream class is received according to an embodiment of the present invention;

2 is a flowchart illustrating managing power used at regular intervals in a mobile communication system according to an embodiment of the present invention;

3 is a flowchart illustrating controlling call admission according to power managed by a mobile communication system according to an exemplary embodiment of the present invention.

The present invention relates to an apparatus and a method for controlling power in a mobile communication system. In particular, the control station of a mobile communication system provides power for call control with HSDPA (High Speed Downlink Packet Access) when a traffic of a stream class is received. It relates to an apparatus and a method for managing.

The traffic classes supported by the Wideband Code Division Multiple Access (W-CDMA) system, which is a mobile communication system, are classified into four categories, and their characteristics and application service relationships are shown in Table 1 below. Same as

Types of Traffic Classes Traffic Class Example of Traffic Class Conversational class -Symmetric bidirectional-Real time (low rate) Speech, video ... Stream class -Asymmetric uni directional-Real time (high rate)-Low delay variation Stream audio, stream video Interactive class Asymmetric bidirectional Non real time (high rate) Burst / Retransmission WWeb browsing Back class (background class) -Asymmetric bidirectional-Non real time (high rate)-Burst / Retransmission background download of emails, FTP ...

Conventional Radio Network Controller (RNC) is a dedicated CHannel when the type of traffic is a conversational class and a stream class having real time characteristics in call admission control. Call admission control, and if the type of traffic is an interactive class or background class with non-real time characteristics, the call is accepted with High Speed Downlink Packet Access (HSDPA). Perform control.

The conventional control station (RNC) is a power for allocating power allocated by a base station to a dedicated physical channel (DPCH) in order to guarantee a quality of service (QoS) for a class having a real time characteristic. And other residual powers. Thus, traffic of a conventional stream class can be serviced at a transmission rate of up to 2 Mbps using a DPCH. However, HSDPA (up to 16Mbps) service using High Speed Physical Downlink Shared CHannel (HS-PDSCH) is required to support data rates of 2Mbps or more.

Accordingly, in order to support a high data rate for traffic of a stream class, the RNC (Radio Access Network) must be able to service a streaming service having real-time specification with HSDPA in call admission control. In addition, it is necessary to control the power required by the HSDPA to guarantee the guaranteed bit rate (GBR) for the minimum QoS of the stream class.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for managing power for traffic connection of a stream class at a control station.

Another object of the present invention is to provide an apparatus and method for managing power for connecting traffic of a stream class to a High Speed Downlink Packet Access (HSDPA) service in a control station of a mobile communication system.

It is still another object of the present invention to provide an apparatus and method for measuring power in use by a traffic connection of a stream class from a base station to an HSDPA service at a predetermined period predetermined by a control station of a mobile communication system.

According to a first aspect of the present invention for achieving the above objects, a power control apparatus of a control station in a mobile communication system is a traffic stream stream from a core network (CN) to a High Speed Downlink Packet Access (HSDPA) service. Upon receiving a Radio Access Bearer (RAB) Assignment Request Message (RAB) that requests to connect the device, the HSDPA service checks a preset amount of power for the traffic connection of the stream class to check whether the traffic connection is possible. And, if the traffic can be connected to the HSDPA service, a call control unit for controlling the traffic to connect the HS-DSCH (High Speed-Downlink Shared CHannel), and under the control of the call control unit and the base station and the Dedicated CHannel (DCH) or And a traffic controller for connecting the traffic to the HS-DSCH.

According to a second aspect of the present invention for achieving the above object, a method for controlling power of a control station in a mobile communication system includes a Radio Access Bearer (RAB) Assignment Request message from a core network (CN). Receiving the RAB allocation request message to request a traffic connection of the stream class to a High Speed Downlink Packet Access (HSDPA) service, and receiving the RAB allocation request message to the HSDPA service. If the message requesting a traffic connection, a process of checking whether a traffic connection is possible by checking a preset power amount for the traffic connection of the stream class, and if the traffic connection is possible with the HSDPA service, HS-DSCH (High) Speed-Downlink Shared CHannel).

According to a third aspect of the present invention for achieving the above objects, a method for controlling power of a control station in a mobile communication system includes: requesting measurement of power used by a base station at a predetermined period and measuring from the base station; When receiving the power, characterized in that it comprises the step of measuring the amount of power (power) of the stream classes that are connected to the traffic to the High Speed Downlink Packet Access (HSDPA) service in the base station.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. If it is determined that the gist of the present invention may be unnecessarily obscured, detailed description thereof will be omitted.

The present invention relates to an apparatus and method for managing power for call control acceptance by High Speed Downlink Packet Access (HSDPA) when a traffic of a stream class is received by a control station of a mobile communication system.

1 is a diagram illustrating a configuration of a mobile communication system that manages power for call control acceptance by High Speed Downlink Packet Access (HSDPA) when a traffic of a stream class is received according to an exemplary embodiment of the present invention. . In FIG. 1, the dotted line indicates the flow of control signals, and the solid line indicates the flow of traffic.

Referring to FIG. 1, the mobile communication system of the present invention largely includes a control station (RNC) 100, a base station 110, and a core network (120). Then, starting from the control station 100, the control station 100 includes a call control unit 102, an interface unit 104, a power management database 106, and a traffic control unit 108.

The interface unit 104 selects a transport channel at the time of receiving a stream class traffic under the control of an operator and sets a threshold of power for the HSDPA. The type of power managed by the control station 100 includes power for a dedicated channel (P_common_dpch), power for an HSDPA stream (P_hsdpa_stream_reserved), and other remaining power (P_residual). That is, the total power P_total managed by the control station 100 is expressed by Equation 1 below.

P_total = P_hsdpa_stream_reserved + P_common_dpch + P_residual

The power management database 106 stores threshold information set for each type of power to be managed and information for estimating a radio load amount for a GBR (Guaranteed Bit Rate) required when servicing traffic of a stream class with HSDPA. Here, the information for estimating the wireless load is information stored in the unit of the wireless load estimation value (P_hsdpa_stream_gbr) for the GBR (Guaranteed Bit Rate) required in accordance with the channel status (CQIA: Channel Quality Information) in percent units. It is stored in the database as

Average CQI When GBR is 8k When GBR is 16k ... 30 One% 2% ... 15 2% 4% ...

The call controller 102 requests the base station 110 to measure the amount of power currently being used, and receives the amount of power measured by the base station 110 to check the amount of power allocated. In addition, when receiving a traffic connection request of the stream class to the HSDPA service through the RAB (Radio Access Bearer) RAB Assignment Request Message (CN), the amount of power of the control station 100 is checked. If the remaining amount of power allocated for the traffic connection of the stream class to the current HSDPA service is larger than the radio load estimation value for the traffic connection of the received stream class, it controls to accept the call connection by the HS-DSCH (High Speed-Downlink Shared CHannel).

The traffic control unit 108 is connected to the base station 110 and the dedicated CHannel (DCH) or HS-DSCH (High Speed-Downlink Shared CHannel) under the control of the call control unit 102, the core network 120 and the base station Control traffic connections between 110.

Meanwhile, the base station 110 includes a call controller 112, a non-HSDPA traffic processor 114, and an HSDPA traffic processor 116.

When the call control unit 112 receives a request for measuring the amount of power currently being used at a predetermined period from the call control unit 102 of the control station 110, the call control unit 112 separately measures and transmits the amount of power being used.

When the call controller 112 receives the connection request through the HSDPA service, the call controller 112 controls to connect the traffic to the High Speed-Downlink Shared CHannel (HS-DSCH) through the HSDPA traffic processor 116, and connects the connection request instead of the HSDPA service. Upon reception, the traffic is controlled to be connected to the dedicated CHannel (DCH) or the High Speed-Downlink Shared CHannel (HS-DSCH) through the Non-HSDPA traffic processor 114.

Hereinafter, a power control method of a mobile communication system according to the present invention configured as described above will be described with reference to the accompanying drawings. FIG. 2 is a flowchart illustrating power management at regular intervals in a mobile communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the control station 100 generates and transmits a used power measurement request message 200 for measuring the amount of power being used by the base station 110 at regular intervals to the base station 110. The base station 110 receives the use power measurement request message 200

Measurement of the power consumption response message including the power currently being used in the dedicated channel (DCH) of the base station 110, the power being used for the HSDPA stream, and other remaining power, and the power consumption information for each type. Is generated and transmitted to the control station (100). The power in use for the HSDPA stream is divided into 16 priority classes and the power strength is expressed as an integer from 0 to 1000.

The control station 100 receiving the used power measurement response message 204 measures the amount of power (%) required for the HSDPA stream using Equation 2 below.

Here, P_hsdpa_stream_required is the amount of power required for the HSDPA stream (%), MaxPriority is the priority of the traffic connecting to the stream class of the HSDPA service, and hsdpa_stream_power is the power consumption of the traffic connected to the stream class of the HSDPA service at the base station.

That is, the control station 100 measures and manages P_hsdpa_stream_required, which is the amount of power (%) required for the HSDPA stream in the base station 110 at regular intervals.

3 is a flowchart illustrating controlling call admission according to power managed by a mobile communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the call controller 102 of the control station 100 confirms reception of a Radio Access Bearer (RAB) Assignment Request message (RAB) from the core network 120 in step 300. The RAB allocation request message is connection information for call admission control and includes type information of a traffic class, HSDPA service information, a maximum bit rate, and a guaranteed bit rate (GBR).

Upon receiving the RAB allocation request message, the call controller 102 proceeds to step 302 and checks whether the type of the traffic class included in the RAB allocation request message is a stream class. If it is not the stream class, the call controller 102 performs the corresponding function. If it is the stream class, the call controller 102 proceeds to step 304 and checks whether the traffic connection of the stream class uses the HSDPA service.

If the HSDPA service is not used, the call controller 102 proceeds to step 312 to connect traffic to the DCH. However, when using the HSDPA service, the call control unit 102 proceeds to step 306 to check whether there is an extra power for connecting traffic of the stream class to the HSDPA service. In this case, the presence or absence of the spare power confirms that the spare power exists when the HSDPA power threshold value P_hsdpa_stream_reserved for the stream set in the control station 100 is greater than the amount of power P_hsdpa_stream_required required for the HSDPA stream in the base station 110. .

If there is no spare power as a result of the check, the call controller 102 proceeds to step 312 to connect traffic to the DCH. However, if there is a surplus power, the call controller 102 proceeds to step 308 and compares the surplus power amount with a wireless load estimation value (P_hsdpa_stream_gbr) corresponding to the GBR (Guaranteed Bit Rate) included in the RAB allocation request message. In this case, the radio load estimation value P_hsdpa_stream_gbr is measured by searching for a value corresponding to the Guaranteed Bit Rate (GBR) included in the RAB allocation request message received from the power management database 106.

If the result of the comparison is that the marginal power is smaller than the estimated wireless load, the call control unit 102 proceeds to step 312 because the traffic of the stream class cannot be connected to the HSDPA service and connects the traffic to the DCH. However, if the result of the comparison is that the marginal power is greater than or equal to the estimated radio load amount, the call controller 102 proceeds to step 310 and connects the traffic to the HS-DSCH.

That is, when the call control unit 102 of the control station 100 receives the RAB allocation request message requesting the traffic connection of the stream class to the HSDPA service, it selects the DCH or the HS-DSCH through Equation 3 below to perform the traffic. Connect.

Here, P_hsdpa_stream_reserved is an HSDPA power threshold value for a preset stream, P_hsdpa_stream_required is an amount of power required for an HSDPA stream at a base station, and P_hsdpa_stream_gbr is a radio load estimation value corresponding to a guaranteed transmission rate (GBR: Guaranteed Bit Rate).

Apparently, there are many ways to modify these embodiments while remaining within the scope of the claims. In other words, there may be many other ways in which the invention may be practiced without departing from the scope of the following claims.

As described above, the present invention relates to an apparatus and method for managing power for call control acceptance with a High Speed Downlink Packet Access (HSDPA) when a traffic of a stream class is received at a control station of a mobile communication system. As a service, power for stream class traffic is managed separately, thereby providing a high data rate for traffic of stream class to HSDPA service.

Claims (12)

In the power control device of the control station in a mobile communication system, When receiving a Radio Access Bearer (RAB) Assignment Request Message (RAB) requesting to connect a traffic of a stream class to a High Speed Downlink Packet Access (HSDPA) service from a core network (CN), the HSDPA service Check the preset power amount for the traffic connection of the stream class, and check whether the traffic connection is possible, and if the traffic connection is possible with the HSDPA service, traffic is performed by HS-DSCH (High Speed-Downlink Shared CHannel). A call controller for controlling the connection; And And a traffic control unit for connecting traffic to a base station and a dedicated channel (DCH) or HS-DSCH under the control of the call control unit. The method of claim 1, And an interface unit configured to select a transport channel when the traffic of the stream class is received by an operator and to set a threshold value of power for connecting the traffic of the stream class to the HSDPA service. The method of claim 1, The type of power managed by the call controller includes power for a dedicated channel (P_common_dpch), power for the HSDPA stream (P_hsdpa_stream_reserved), and other remaining power (P_residual). The method of claim 3, wherein The control station is configured to calculate a threshold value set for each type of power managed by the call controller and a radio load estimation value corresponding to a guaranteed transmission rate (GBR: Guaranteed Bit Rate) required for traffic connection of the stream class to the HSDPA service. And a power management database for storing. The method of claim 1, If the following Equation 4 is true, the call controller determines that the traffic connection is possible to the HSDPA service. If the Equation 4 is false, the call controller determines that the traffic connection is impossible to the HSDPA service. Device.

Here, P_hsdpa_stream_reserved is an HSDPA power threshold value for a preset stream, P_hsdpa_stream_required is an amount of power required for an HSDPA stream at a base station, and P_hsdpa_stream_gbr is a radio load estimation value corresponding to a guaranteed transmission rate (GBR). The method of claim 1, The call controller requests the base station to measure the power used at regular intervals, receives the power measured by the base station, and measures the amount of power of the stream classes that are connected to the HSDPA service at the base station. Device characterized in that. In the power control method of the control station in a mobile communication system, Receiving a Radio Access Bearer (RAB) Assignment Request Message (RAB) from a core network (CN); Checking whether the RAB allocation request message is a message requesting a traffic connection of a stream class to a High Speed Downlink Packet Access (HSDPA) service; If the RAB allocation request message is a message requesting traffic connection of the stream class to the HSDPA service, checking whether a traffic connection is possible by checking a preset amount of power for traffic connection of the stream class; And And if the traffic connection is possible through the HSDPA service, connecting traffic to a High Speed-Downlink Shared CHannel (HS-DSCH). The method of claim 7, wherein If the traffic connection is not possible through the HSDPA service, the method further comprises connecting traffic to a dedicated channel (DCH). The method of claim 7, wherein Before the process of receiving the RAB allocation request message, And selecting a transport channel to be connected when the traffic of the stream class is connected, and setting a threshold of a power amount for connecting the traffic of the stream class to the HSDPA service. The method of claim 7, wherein The type of power managed by the control station includes power for a dedicated channel (P_common_dpch), power for the HSDPA stream (P_hsdpa_stream_reserved), and other remaining power (P_residual). The method of claim 7, wherein In the process of checking whether the traffic connection is possible, if Equation 5 below is true, it is determined that the traffic connection is possible to the HSDPA service. If Equation 5 is false, the traffic is transmitted to the HSDPA service. Characterized in that it is determined that the connection is impossible.

Here, P_hsdpa_stream_reserved is an HSDPA power threshold value for a preset stream, P_hsdpa_stream_required is an amount of power required for an HSDPA stream at a base station, and P_hsdpa_stream_gbr is a radio load estimation value corresponding to a guaranteed transmission rate (GBR). In the power control method of the control station in a mobile communication system, Requesting measurement of power used by a base station at a predetermined period; And And receiving the measured power from the base station, measuring the amount of power used by the stream classes being traffic-connected to the High Speed Downlink Packet Access (HSDPA) service at the base station.

Images