KR100652693B1 - A method and a apparatus of advanced power control on hand-over for mobile phone - Google Patents

Abstract

The present invention softly determines the power control of a plurality of handover links connected by mobile terminal mobility and performs power control based on a weight. The inner loop power control value of a plurality of handover channels connected to the portable terminal controller and applied is averaged. A soft calculating unit for calculating and outputting the calculated value; A control unit connected to the soft operation unit, the control unit detecting and softly computing power control signals of a plurality of handover channels that are wirelessly received, and softly controlling output power; A soft controller configured to set the wireless output power to an inner loop power control value softly calculated by the control of the controller; And a wireless unit for wirelessly connecting to the base station under the control of the controller, wirelessly receiving the inner loop power control signal, and transmitting / receiving the communication signal, and handover when handover by movement of the mobile terminal. A start process of determining whether there are a plurality of allowed channels; A soft process of detecting and soft computing each inner loop power control value of the received handover channel if the handover channel is plural; And a control process of controlling the output power and handing over the soft calculated inner loop power control value.

Description

A device and method for improving handover power control of a mobile terminal {A METHOD AND A APPARATUS OF ADVANCED POWER CONTROL ON HAND-OVER FOR MOBILE PHONE}

1 is a functional configuration diagram of an inner loop power control device of a conventional mobile communication system;

2 is an inner loop power control table according to the prior art;

3 is a functional block diagram of an apparatus for improving handover power control of a mobile terminal according to the present invention;

4 is a flowchart of a handover power control method for a portable terminal according to the present invention;

5 is a soft inner loop power control table of a portable terminal according to the present invention;

          ** Explanation of symbols on the main parts of the drawing **

100: wireless unit 110: control unit 120: memory unit

130: communication unit 140: soft control unit 150: soft operation unit

The present invention softly determines the power control for the multiple links of the handover generated by the mobility of the mobile terminal and selects the optimal link by power control by the weight so that the handover power control improvement device of the mobile terminal accurately and smoothly proceeds. And to a method.

The mobile communication system is a mobile terminal (UE) to move using the mobile terminal (UE), anytime, anywhere and wireless communication with the other party at any time, and the radio frequency resources used in the wireless communication is a natural resource and limited, so that a plurality of mobile terminals There are a code division multiple access (CDMA) method, a GSM (GSM) method, and the like.

The code division multiple access (CDMA) method was developed around Korea and the United States, and the GSM (GLOBAL SYSTEM FOR MOBILE COMMUNICATION) method was developed around Europe. Widely applied and used in.

In the code division multiple access method and the GSM method, a method of communicating with a counterpart using a video signal is called a third generation 3GPP (3RD GENERATION PARTNERSHIP PROJECT) system and a UMTS: UNIVERSAL MOBILE TELECOMMUNICATION SYSTEM (UMTS) system. In the case of the UTM system, high-speed data transmission of 2 Mbps or more is possible.

Since the mobile communication system allocates channels or transport channels for multiple subscribers using the same frequency or physical channel, multiple mobile terminals (UE) using the same frequency at the same time. Is the way to communicate at the same time.

The mobile terminal (UE: USER EQUIPMENT) is connected to a base station system (hereinafter referred to as a base station, RAN: RADIO ACCESS NETWORK) including a base station controller (RNC: RADIO NETWORK CONTROLLER) and a base station (BS or NODE-B), the mobile switching station Communicate in the communication path set by switching control of (MSC: MOBILE SWITCHING CENTER).

In the mobile communication system, the base station RAN should have the same level of the signal received from the plurality of mobile terminals. Otherwise, the mobile communication system preferentially processes the signal having the large reception level, and thus has a small output signal level. Will competitively raise the output level.

The level of the base station of the mobile communication system is limited, and if the level received from the mobile terminal is high, the level transmitted from the base station must also be large.

Accordingly, the base station RAN controls output levels of the mobile terminals to be equally controlled so that a plurality of portable terminals can wirelessly connect and communicate with limited frequency resources, and the output power control is a quality that can be communicated with the portable terminals. The minimum output power should be maintained while maintaining (QUALITY).

The output power control as described above is a method of controlling the target signal-to-noise ratio (TARGET SIR) of each mobile terminal (UE), the change in the output power is caused by a change in the distance between the base station and the mobile terminal, but handover It also occurs due to changes in the surrounding wireless environment such as (HAND-OVER).

The output power control of the mobile terminal UE is called an outer loop power controller (OLPC: OUTER LOOP POWER CONTROLLER), which is performed between the base station controller RNC and the base station NODEB. The output power control that occurs between (UE) is called INNER LOOP POWER CONTROLLER (ILPC).

The handover is generated by the movement of the mobile terminal. The handover is performed by accessing a channel provided by a neighboring base station (RAN), analyzing a corresponding power control signal, and setting an optimum output power. In a plurality of cases, the output power controlled for each channel may be different according to the wireless environment at the current location, and different output power control signals by each channel reflect the wireless environment at the current location.

Therefore, when handing over to a channel provided by an adjacent base station due to the movement of the mobile terminal, there is a need to develop a technology for controlling the output power of the mobile terminal to an optimal state by reflecting the wireless environment at the current location.

Attached to explain the prior art, FIG. 1 is a functional configuration diagram of an inner loop power control device of a mobile communication system according to the prior art, and FIG. 2 is an inner loop power control table according to the prior art.

In the mobile communication system, a plurality of portable terminals 30 are wirelessly connected in a service area formed by the base station 20 to use a mobile communication service. The plurality of portable terminals 30 move in corresponding directions, respectively, 20) The distance from the line is far and near, and fluctuates frequently.

When each mobile terminal 30 transmits a wireless signal with the same output power, the base station 20 has a problem that the strength of the power received from each mobile terminal 30 is not constant (NEAR-FAR PROBLEM) The above problem is analyzed as noise due to the interference between the plurality of mobile terminals 30.

In the mobile communication system, uplink (UP-LINK) signals transmitted from the plurality of mobile terminals 30 to the base station 20 must be received at the same size or level at the base station 20 so that the quality of the communication at the mobile terminal 30 can be achieved. Can be kept constant.

In the DOWN-LINK transmitted from the base station 20 to the mobile terminal 30, since there is no NEAR-FAR PROBLEM as described above, a weak signal is received by the mobile terminal 30 or fading far away. Transmitting a control signal (TPC: TRANSPORT POWER CONTROL) to increase the output power to the portable terminal 30 to be.

As described above, the signal-to-noise ratio (SIR) of the mobile terminal 30 is measured in the inner loop power control between the base station 20 and the mobile terminal 30, and the outer loop power control is performed using the measured SIR value SIR _est . Compared with the target signal-to-noise ratio (TARGET SIR) (SIR _target ) applied from the base station controller, the value of '0' is obtained because the signal-to-noise ratio (SIR) received from the mobile terminal 30 is bad in the case of SIR _est > SIR _target . Inner loop output power control signal (TPC) corresponding to the wireless output from the base station 20 to the mobile terminal 30, and the case of SIR _est <SIR _target is a good case, the inner loop corresponding to the value of '1' The output power control signal TPC is wirelessly output to the mobile terminal 30.

As described above, the inner loop output power control signal value P (k) transmitted from the base station 20 to the mobile terminal 30 can be expressed as follows.

(Equation 1)

P (k) = P (k-1) + P _TPC (k)

P (k); Output power control signal of current slot

P (k-1); Output power of previous slot

P _TPC (k); Output power control value of current slot

The P _TPC (k) is determined by the signal-to-noise ratio (SIR) received from the mobile terminal 30 and is expressed as follows.

(Equation 2)

P _TPC (k) = + Δ _TPC if TPCest (k) = 1

-Δ _TPC if TPCest (k) = 0

As described above, the mobile terminal UE 30 having received the inner loop output power control signal TPC transmitted from the base station 20 to the mobile terminal 30 outputs itself according to the output power control signal TPC value. Adjust the power.

The portable terminal 30 controls the output power under the control of the base station 20, and communicates with the connected counterpart through the communication path set by the switching of the mobile switching station 10 in a wirelessly connected state.

When the mobile terminal 30 moves to the service area of the base station 20 and enters the service area of the adjacent base station 20, the mobile terminal 30 receives a handover accessible channel from the adjacent base station 20, and the adjacent base station 20 is provided. If there are a plurality of), a plurality of handoverable channels are provided.

Referring to FIG. 2, the result of the inner loop power control (ILPC) is shown when the output power control signals of the respective link channels are different when there are a plurality of adjacent base stations due to the handover of the mobile terminal. It is.

2 is based on a state in which a first channel RL1 has a better quality than a second channel RL2, and the inner loop power control signal of the first channel RL1 is set to a value of 1. FIG. Upon reception, regardless of the inner loop power control signal value of the second channel RL2, the output power of the mobile terminal is increased by a predetermined amount (+ delta A).

In addition, when the inner loop power control signal of the first channel RL1 is received at a value of 0 lowering to a predetermined size, the output power is set to a predetermined size regardless of the inner loop power control signal value of the second channel RL2. Decrease by (Delter A).

That is, since the prior art of the above configuration does not reflect the output power control value of other adjacent channels based on the channel having the highest quality, the wireless environment at the current location is not optimally reflected, so the handover is quick. There is a problem that is not made smoothly.

The present invention softly calculates and controls an inner loop power control (ILPC) value for a plurality of adjacent channels to be handed over as a mobile terminal moves, thereby allowing handover power control of a mobile terminal to quickly and smoothly determine an optimal handover channel. It is an object of the present invention to provide an improvement apparatus and method.

In order to achieve the above object, the present invention includes a soft computing unit for connecting to the mobile terminal control unit and outputting the average loop operation of the inner loop power control value of a plurality of handover channels; A control unit connected to the soft operation unit, the control unit detecting and softly computing power control signals of a plurality of handover channels that are wirelessly received, and softly controlling output power; A soft controller configured to set the wireless output power to an inner loop power control value softly calculated by the control of the controller; Under the control of the controller, the wireless connection with the base station, the inner loop of the power control signal is received, characterized in that the configuration comprises a wireless unit for transmitting and receiving a communication signal.

In addition, the present invention has been made in order to achieve the above object, the handset when the handover by the movement of the mobile terminal to determine whether the number of channels allowed for handover; A soft process of detecting and soft calculating each inner loop power control value of the received handover channel if the handover channel is plural; And a control process of controlling the output power and handing over the soft calculated inner loop power control value.

Hereinafter, an apparatus and method for improving handover power control of a portable terminal according to the present invention will be described with reference to the accompanying drawings.

3 is a functional configuration diagram of a handover power control improving apparatus for a portable terminal according to the present invention, and FIG. 4 is a flowchart of a handover power control method for a portable terminal according to the present invention.

Referring to FIG. 3, the apparatus for improving handover power control of a mobile terminal according to the present invention is described. The wireless communication with the base station RAN under the control of the mobile terminal controller 110 for mobile communication is performed to control output power. A wireless unit 100 wirelessly receiving an inner loop power control signal and wirelessly receiving a communication signal;

A hand received from each base station (RAN) through the wireless unit 100 by connecting to the wireless unit 100, detecting and softly calculating power control signals of a plurality of handover channels that are wirelessly received, and controlling output power. A control unit 110 for soft control and handover of an inner loop power control (ILPC) value of the over channel and soft calculation to set the output power of the wireless unit 100;

A memory unit 120 connected to the controller 110 for recording and outputting an operating program, an application program, and data to an allocated area;

A communication unit 130 connected to the control unit 110 and communicating by selecting a voice level, a text level, and a multimedia level;

The wireless output power is connected to the control unit 110 and set to a soft computed inner loop power control (ILPC) value. The control unit 110 controls the inner loop power control value calculated by the soft operation unit. Soft control unit 140 for controlling the output power of the wireless unit 100 is set,

It is connected to the mobile terminal controller 110 and outputs an average soft calculation of an inner loop power control (ILPC) value of a majority handover channel applied to the control of the controller 110. In this case, the number of handover channels received and applied is calculated by the number in the binary method, and the soft calculation unit 150 for calculating and outputting the inner loop power control values processed by the table based on the channel having a good reception signal quality. It is a structure made.

Hereinafter, the present invention having the above-described configuration will be described in detail with reference to the accompanying drawings.

When the operating power is supplied, the controller 110 of the mobile communication portable terminal loads the operation program, the application program, and the corresponding data from the memory unit, sets an operation standby state, uses a mobile communication service, or Use additional services.

The controller 110 of the portable terminal may move in a state of using a mobile communication service by wirelessly connecting to a base station (RAN) or in an additional service use state connected to a mobile communication system. It enters the service area of the neighboring base station out of.

When entering the service area of the neighboring base station as described above, a new channel must be allocated from the base station (RAN), and the channel change due to the movement is called a handover (HAND-OVER).

When the mobile terminal moves to the service area of the neighboring base station RAN by movement, when the service area of the neighboring base station RAN overlaps (OVERLAP), a channel for allowing handover is allocated from each base station. As described above, the handover is completed since the reception level of the channel to which the plurality of handovers are allowed is determined, the channel having the best signal-to-noise ratio is selected, and the output power is set by the corresponding output power control.

Each channel to which the handover is allowed outputs a corresponding inner loop power control signal, and the power control signal is slightly different according to the wireless environment, and the corresponding power control command of each channel to allow handover. By analyzing the signal, we can estimate the optimal radio environment at the current location.

As described above, by analyzing and softly processing the inner loop power control signal of each channel allowing the handover at the current position, the handover is quickly and smoothly calculated and applied to the optimum power control value at the current position. It is the technique of the present invention.

Since the controller 110 of the portable terminal analyzes the inner loop power control (ILPC) signal of the base station (RAN) received through the wireless unit 100, the controller 110 allocates a channel to allow handover from adjacent base stations. When the corresponding output power control signal is received, each output power control signal is detected and applied to the soft operation unit 150.

The soft operation unit 150 softly determines the output power control signal of each channel.

The output power control algorithm for performing handover in a 3GPP mobile communication system according to standard 25.211 is "TPC_cmd = γ (W1, W2, ,,, Wn), where TPC_cmd can take the value 1 or -1 . "

According to the above standard, the controlled output power value controls the output power to 1 or 0 in a predetermined unit or size, where 1 is to increase the output power by a predetermined unit, and 0 is to decrease the output power by a predetermined unit. will be.

The present invention analyzes the output power control values of all the link (RL: RINK) channels allowed for handover, configures the number of cases by multiples of binary numbers in a table, and outputs the output power in a predetermined unit or less. Because of the control, the wireless environment at the current location is optimally reflected.

That is, when two link stations are allocated the link channel by allowing the handover, respectively, the number of four cases is obtained by a multiple of two, and when the link channel is allocated by allowing the handover from the three base stations, respectively. , The number of eight cases by the 3 multiple of 2, as shown in FIG.

The soft operation unit 150 substitutes the output power control signal of each channel to allow handover into the table of FIG. 5 to calculate and search the corresponding inner loop power control (ILPC) value.

The value retrieved by calculating as described above is smaller than the unit of the predetermined standard, and when the handover link (RL) channel is accepted from two base stations, the handover link channel is determined from three base stations. If it is allowed, the output power is controlled by the size of quarter unit, so it is controlled by the optimal inner loop output power (ILPC) reflecting the wireless environment at the corresponding position.

That is, in the related art, although the output power control signal of the best quality channel is applied, the present invention reflects the output power control values of all received channels, and uses the table of FIG. 5.

Since the output power control signal calculated by the soft calculating unit 150 is applied to the wireless unit 100 by the soft control unit 140, the output power of the wireless unit 100 is controlled, In this state, the controller 110 performs a handover (HAND-OVER) quickly and smoothly to a channel provided and permitted by the corresponding base station (RAN).

The communication unit 130 is used for communication using a voice level signal, a text level signal, or a multimedia level signal including a video signal.

The present invention having the above-described configuration has an advantage of controlling the output power in an optimal state in the corresponding wireless environment since it reflects the output power control signal value due to the multiple handover channels at the corresponding location.

Hereinafter, a method for improving handover power control of a portable terminal according to the present invention will be described with reference to FIG. 4.

In the case of handover by the movement of the mobile communication terminal, it is determined whether there are a plurality of channels allowed for handover, and the process of determining whether the mobile terminal performs the handover for changing the assigned channel by changing the service area of the base station (S100). ); When the handover in the process (S100) and the start process consisting of the step (S110) of determining whether a plurality of the handover allowed channels,

If there are a plurality of handover channels in the start process, each inner loop power control value of the received handover channel is detected and soft calculated. If there are a plurality of channels allowed for handover in the start process, each received handover channel is performed. Detecting an inner loop power control value of the signal (S120); A soft process comprising a soft operation (S130) of calculating the inner loop power control value of the plurality of channels detected in the process (S120),

Controlling and outputting the output power with the inner loop power control (ILPC) value softly calculated in the soft process, and softly controlling the calculated inner loop power control value with the output power of the wireless unit 100 (S140). ; It consists of a control process consisting of setting the output power of the process (S140) and handover to the optimal quality channel (S150).

Hereinafter, a method of improving handover power control of a portable terminal according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

When the mobile terminal moves from the service area formed by the current base station and enters the service area formed by the neighboring base station, a new channel must be allocated to occupy the channel and maintain communication in progress. In order to maintain the ongoing communication in the service area to be formed, handover of the channel allocation is performed, and it is determined whether the handover should be performed (S100).

When handover (HAND OVER) by moving the service area of the mobile terminal in the process (S100), there may be a plurality of neighboring base stations, each neighboring base station allocates a channel to allow the handover, for handover A large number of channels are linked (RL: RINK).

The portable terminal determines whether there are a plurality of linked channels (S110), and if there are a plurality of linked channels in the determination (S110), the portable terminal detects an inner loop power control (ILPC) value of each handover channel that is linked and received. A table as shown in FIG. 5 is created (S120), and the inner loop power control (ILPC) value is controlled and calculated by the soft computing unit 150 as in the detected and prepared table (S130).

The soft determination value calculated and calculated in step S130 softly controls the output power of the wireless unit 100 by the soft control unit 140 (S140).

The soft control is to control the output power of the wireless unit in a smaller unit than the predetermined predetermined unit, and reflects the power control signal values of the plurality of link channels received at the current location, thereby optimal inner loop power in the current wireless environment. Control by the control value.

If the soft control as described above, the signal-to-noise ratio is excellent, the optimum communication state is maintained, and the base station receives the output power of the mobile terminal at an appropriate level, and is processed quickly without requiring additional power control, and handover (HAND OVER) proceeds smoothly and quickly (S150).

Accordingly, the present invention having the above configuration softly calculates the inner loop power control (ILPC) value by the link channel of each base station allowing handover, and softly controls the output power of the wireless unit, thereby providing a wireless environment at the current location. Reflecting the optimal state and at the same time has the advantage of proceeding handover quickly and smoothly.

The present invention of the above configuration, in the case of handover by the movement of the mobile terminal, soft calculation that reflects all the power control values of the linked multiple channels, and soft output power control, so that the optimal channel in the wireless environment of the current location There is an industrial use effect of handing over to a network.

In addition, as the output power for the handover, soft control that is the optimum inner loop output power control at the current position, there is a convenient effect in use to proceed a quick and smooth handover.

Claims (9)

A soft operation unit connected to the mobile terminal control unit for performing an average soft operation on the inner loop power control values of the multiple handover channels to be applied and outputting the average soft operation; A control unit connected to the soft calculating unit and monitoring the soft control unit to detect and soften a power control signal of a plurality of wireless handover channels, and to soft control the output power; A soft control unit for setting the wireless output power to the inner loop power control value softly calculated by the control unit; An apparatus for improving handover power control of a portable terminal, characterized by comprising a wireless unit configured to wirelessly connect with a base station under the control of the controller, wirelessly receive an inner loop power control signal, and transmit and receive a communication signal. delete The method of claim 1, wherein the soft operation unit, Under the control of the control unit, the number of received and applied handover channels is calculated by the number in the binary method, and the inner loop power control values processed by the table are calculated and output based on the channel having a good reception signal quality. Handover power control improvement device of a portable terminal, characterized in that made. delete The method of claim 1, wherein the control unit, Handover power of the mobile terminal, characterized in that it is configured to detect and control the inner loop power control value of the handover channel wirelessly received from a plurality of base stations and perform a soft operation to set the output power of the wireless unit to control and monitor the handover. Control improver. In the case of handover by the movement of the mobile terminal, the start process of determining whether the number of channels allowed for handover; A soft process of detecting and soft computing each inner loop power control value of the received handover channel if the handover channels are multiple; And a control process for controlling output power and handing over the soft calculated inner loop power control value. The method of claim 6, wherein the starting process, Determining whether a handover for changing a service area of an eNB and changing an allocated channel is performed by the mobile terminal mobility; The method for improving handover power control of a portable terminal, characterized in that the handover is made in the process of determining whether there are a plurality of channels allowed for handover. The method of claim 6, wherein the soft process, Detecting an inner loop power control value of each received handover channel if a plurality of channels are allowed for handover in the starting process; And performing a soft calculation of the detected inner loop power control values of the plurality of channels. The method of claim 6, wherein the control process, Soft control of the inner loop power control value calculated in the soft process with the output power of the wireless unit, The method for improving handover power control of a portable terminal, characterized in that the process of setting the output power by the soft control to handover to the optimum quality channel.

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