KR20140086238A - Method and apparatus for controlling of uplink transmission power - Google Patents

Method and apparatus for controlling of uplink transmission power Download PDF

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KR20140086238A
KR20140086238A KR1020120156476A KR20120156476A KR20140086238A KR 20140086238 A KR20140086238 A KR 20140086238A KR 1020120156476 A KR1020120156476 A KR 1020120156476A KR 20120156476 A KR20120156476 A KR 20120156476A KR 20140086238 A KR20140086238 A KR 20140086238A
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South Korea
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value
mcs
srs
sinr
user terminal
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KR1020120156476A
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Korean (ko)
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주성돈
김영초
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에릭슨 엘지 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to an uplink transmission power control method and apparatus considering channel quality in a 3GPP (Long Term Evolution) mobile communication system. The uplink transmission power control apparatus of the present invention sets a target signal to interference noise ratio (SINR) to be applied to a base station including an uplink transmission power control apparatus, and transmits an SRS (SINR) value using the measured SRS power value, and transmits the SRS signal to at least one user terminal so that the SRS SINR value is within the set range. Control the power.

Description

TECHNICAL FIELD [0001] The present invention relates to an uplink transmission power control method and apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a method and an apparatus for controlling uplink transmission power in a 3GPP (Long Term Evolution) mobile communication system considering channel quality.

The long term evolution (LTE) system based on orthogonal frequency division multiplexing (OFDM) is greatly affected by the interference signal of the adjacent base station due to the OFDM specification. Particularly, in the case of uplink, although the strength of an interference signal is high to obtain a high signal-to-interference noise ratio (SINR), transmission power of a user equipment (UE) Can not be increased in proportion to the intensity of the interference signal. Therefore, it is necessary to minimize the interference signal of the adjacent base station. If the user terminal is far from the center of the cell or the quality of the received signal is not good, if a high transmission rate is allocated to the user terminal, the transmission power of the user terminal becomes high and an unnecessary interference signal is generated in the adjacent cell have. The same phenomenon occurs in the adjacent cell, and the intensity of the interference signal increases with time. In this environment, it is necessary to control the transmission rate of the user terminal in order to reduce the uplink interference signal.

In the LTE system, the transmission rate can be determined according to a modulation and coding scheme (MCS) and a resource block (RB) allocated to a physical uplink shared channel (PUSCH). In general, the setting of the MCS depends on the quality of the received signal. Therefore, if the MCS value allocated to each user terminal is controlled, the uplink transmission rate can be controlled to be suitable for the channel environment. The quality of the uplink channel can be confirmed by the received PUSCH or SRS (sounding reference signal). When there is application data to be transmitted, the user terminal transmits PUSCH using the PUSCH, so that the channel quality can be confirmed only when there is data. Since the SRS periodically transmits in the user terminal, the current channel quality can be confirmed. On the other hand, if the channel environment changes very rapidly and the SRS transmission period is long, it may not reflect the latest channel environment. The base station can determine the MCS using the SINR information received via the PUSCH or the SRS.

Korean Patent Publication No. 10-2012-0025132 (published on Mar. 15, 2012)

The present invention provides an uplink transmission power control method and apparatus considering a channel quality in a 3GPP (Long Term Evolution) mobile communication system.

An apparatus for controlling uplink transmission power of the present invention includes a target SINR setting unit for setting a target signal to interference noise ratio (SINR) to be applied to a base station including an uplink transmission power control apparatus; A SINR calculator for measuring a SRS (Sounding Reference Signal) power value transmitted from at least one user terminal under the control of the BS and calculating a SRS signal to interference noise ratio (SRS) value using the measured SRS power; And a user terminal controller for controlling the SRS transmission power for each at least one user terminal so that the SRS SINR value is within a set range.

The method further includes setting a target signal to interference noise ratio (SINR) to be applied to the base station including the uplink transmission power control apparatus. Measuring a SRS (Sounding Reference Signal) power value transmitted from at least one user terminal under the control of the BS and calculating a SRS signal to interference noise ratio (SINR) value using the measured SRS power value; And controlling the SRS transmission power for each at least one user terminal so that the SRS SINR value is within a set range.

According to the present invention, it is possible to set an appropriate MCS according to a change in the channel environment, thereby stably operating the system.

1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an uplink transmission power control apparatus,
3 is a diagram illustrating an exemplary configuration of an MCS reset unit according to an embodiment of the present invention.
4 is a flowchart illustrating a procedure of an uplink transmission power control method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail if they obscure the subject matter of the present invention.

1 is a block diagram illustrating a configuration of a mobile communication system according to an embodiment of the present invention.

As shown in FIG. 1, the mobile communication system includes a 2G mobile communication network such as Global System for Mobile communication (GSM), a code division multiple access (CDMA), a long term evolution (LTE) network, a wireless Internet such as WiFi, (E.g., a 3G mobile communication network such as WCDMA or CDMA2000, a High Speed Downlink Packet Access (HSDPA), or a High Speed (HSUPA) A 3.5G mobile communication network such as Uplink Packet Access (E-DCH), or 4G to be developed in the future), a base station (eNB) 20 and a user equipment (UE) But is not limited thereto.

As shown in FIG. 1, the mobile communication system may include one or more cells, and cells of different types may be mixed in the mobile communication system. The mobile communication system may include a user terminal (UE) 10, a base station (eNB) 20 for managing a cell, a self organizing & optimizing network (SON) server 30 and an MME 40. The number of each component shown in FIG. 1 is illustrative, and the number of each component of the mobile communication network in which the present invention can be implemented is not limited to the number shown in the drawings. Cells constituting the mobile communication system can independently have connectivity with the core network.

The base station 20 has a feature of a macro cell base station having a radius of, for example, about 1 km, which can be used in an LTE network, a WiFi network, a WiBro network, a WiMax network, a WCDMA network, a CDMA network, a UMTS network, But is not limited thereto.

The user terminal 10 may be a wireless Internet network such as a GSM network and a CDMA network, a wireless Internet network such as an LTE network and a WiFi network, a portable Internet network such as a WiBro network and a WiMax network, But is not limited to, the characteristics of the mobile terminal.

A management server (OAM server) 50, which is a network management apparatus of the base station, is responsible for managing the configuration information of the base station 20. [ The management server 50 can perform all the functions of the SON server 30 and the MME 40. [

The SON server 30 may include any server that performs base station installation and optimization and functions to provide basic parameters or data necessary for each base station.

The MME 40 may include any entity used for managing call processing and the like of the user terminal 10. [ The MME 40 performs a function of a base station controller (BSC) and can perform resource allocation, call control, handover control, voice and packet processing, and the like to the base station 20 connected thereto.

2 is a diagram illustrating a configuration of an uplink transmission power control apparatus according to an embodiment of the present invention.

2, the uplink transmission power control apparatus 100 includes a target SINR setting unit 110, an SINR calculation unit 120, a user terminal control unit 130, an MCS setting unit 140, and an MCS resetting unit 150).

The target SINR setting unit 110 sets a target SINR to be applied to the base station 20. In one embodiment, the target SINR setting unit 110 may set the target SINR to a value that maximizes the cell throughput of the base station 20. The target SINR is a value that can be changed according to the performance of the modem, which is determined before the system is operated, and is not changed during system operation. However, the target SINR setting method is not limited to the above-described embodiment.

The SINR calculator 120 measures the SRS power value transmitted from the at least one user terminal 10 controlled by the base station 20 and uses the measured SRS power to measure the SRS SINR interference noise ratio) value. In one embodiment, the SINR can be calculated using the following equation (1).

Figure pat00001

The SINR can be expressed as a ratio to the sum of noise and interference components for the received SRS power. Assuming that the denominator (noise, interference) is constant in Equation (1), the SINR increases when the power component of the molecule increases. If the noise or interference component increases due to the change of the channel environment, the transmission power of the user terminal 10 may be increased to maintain a constant SINR. Since the user terminal 10 periodically transmits the SRS to the base station 20 irrespective of whether there is data to be transmitted, the base station 20 uses the SRS power value received by the user terminal 10 You can check the quality of the channel.

The user terminal control unit 130 can control the SRS transmission power for each user terminal 10 so that the SRS SINR value calculated by the SINR calculation unit 120 is within a predetermined range. In one embodiment, the user terminal control unit 130 may control the SRS transmission power of the user terminal 10 using Equation (2).

Figure pat00002

Represents the SINR SRS _ target is the target SINR in equation 2, SINR SRS _ revd indicates the SRS SINR values determined in SINR calculating unit (120), Δ is a margin to avoid too frequent SRS transmission power control (margin) value. In one embodiment, the DELTA value can be set to have a value within 3 dB.

The MCS (modulation and coding scheme) setting unit 140 sets the MCS according to the user terminal 10 using the SRS SINR value calculated by the SINR calculating unit 120. The MCS setting unit 140 can set the MCS of the user terminal 10 using a mapping table as shown in Table 1 below.

SINR MCS 0 0 One One 2 2 19 19 20 20 21 21 25 28

In the mapping table of Table 1, the SRS SINR value and the corresponding MCS value are mapped. The mapping table may be formed using experimental or statistical results.

The MCS resetting unit 150 can reset the MCS already set to fit the channel environment. In one embodiment, the MCS resetting unit 150 may reset the MCS using the received signal strength indicator (RSSI), block error rate (BLER), and power headroom (PH) received at the base station 20. The MCS resetting method will be described later with reference to FIG. In one embodiment, when the MCS resuming unit 150 maintains a stable channel with a weak interference component and a small channel change, the SRS SINR value converges to the target SINR set in the system, and the base station 20 adjusts the system- The MCS is stably selected for transmission of the uplink traffic of the user terminal 10. [ However, when the channel condition is deteriorated or the user terminal 10 moves, the SRS SINR value changes to a different value, and the allocated MCS is also changed. However, under circumstances where the SRS transmission power control can operate normally, the optimized MCS is eventually reassigned.

3 is a diagram illustrating an exemplary configuration of an MCS reset unit according to an embodiment of the present invention.

As shown in FIG. 3, the MCS resetting unit 150 may include a table resetting unit 151 and a maximum MCS setting unit 152.

The table resetting unit 151 can change the MCS mapping value of the mapping table. In one embodiment, the table re-configuration unit 151 may change the mapping table MCS mapping value of Table 1 using the BLER received by the base station 20. [ The BLER can be measured using a cyclic redundancy check (CRC) error rate of transport blocks received over a physical uplink shared channel (PUSCH) for a predetermined time. The table re-setting unit 151 sets a minimum BLER (BLER min ) and a maximum BLER (BLER max ) so that high cell throughput can be maintained using experimental results or simulation results in various wireless environments, The offset value to be used for changing the MCS mapping value of the mapping table can be changed according to the relationship between the minimum BLER and the maximum BLER value. The change of the offset value can be performed using the following equation (3).

Figure pat00003

In Equation 3 Δ (i) offset represents the changed offset value, Δ (i-1) offset denotes a previous offset value, Δ max _ down _ offset denotes an offset maximum reduction value, Δ down is offset reduced value a represents, Δ max _ _ up offset indicates a maximum offset increment value, Δ indicates up to increase the offset value. That is, the offset value used for the table re-establishment is determined by decreasing the previous offset value by a predetermined offset decrease value when the received BLER value is larger than the maximum BLER value, but can not be decreased below the predetermined offset maximum decrease value, If the received BLER value is smaller than the minimum BLER value, it is determined that the previous offset value is increased by a predetermined offset increase value, but can not be increased beyond the predetermined offset maximum increase value. On the other hand, if the received BLER value is equal to or greater than the minimum BLER value and less than or equal to the maximum BLER value, the offset value equal to the previous offset value can be determined. That is, it is possible to limit the maximum amount of change of the offset value and set it so that it can adapt quickly when the channel environment changes.

Table 2 illustrates a mapping table indicating a case where the MCS mapping value is offset by 3 equally when the received BLER value is larger than the maximum BLER value due to a poor channel environment.

SINR MCS 0 0 One 0 2 0 19 16 20 17 21 18 25 22

The maximum MCS setting unit 152 may set the maximum changeable MCS (MCS max ) value of the user terminal 10. The maximum MCS setting unit 152 may set the maximum MCS setting unit 152 to a PH value reported by the user terminal 10 to the base station 20, an RSSI value of the individual user terminal 10 received by the base station 20, The maximum MCS can be set. The RSSI value of the individual user terminal 10 can be calculated by measuring the received power of the SRS periodically reported by each user terminal 10 and the RSSI value of the received bandwidth can be calculated from the total RF reception band The energy value of all the received signals can be measured and calculated. Meanwhile, the maximum MCS setting unit 152 may set the maximum value of the maximum MCS (MCS PH , max ) for PH and the maximum MCS (MCS RSSI , max ) by RSSI to the maximum MCS.

On the other hand, the maximum MCS setting unit 152 can set the maximum MCS value by PH in the following manner. Since the PH value indicates the power that the user terminal 10 can transmit additionally, the SRS SINR value received by the base station 20 by the PH value can be increased. In view of this, if the power value that can be further transmitted is added to the power value transmitted by the user terminal 10 before, the maximum MCS that can be transmitted from the user terminal 10 can be found. Based on this, Should be. Since the base station 20 does not know the transmission power of the user terminal 10 accurately, the following method is used. The base station 20 finds the SINR corresponding to the MCS allocated to the user terminal 10 from the MCS mapping table of Table 1 to the previous time and adds the PH reported by the user terminal 10 to the base station 20 again using the SINR value Once the corresponding MCS is selected in the mapping table of Table 1, the maximum MCS by PH can be set.

 In addition, the maximum MCS setting unit 152 can set the maximum MCS value by RSSI in the following manner. The RSSI is a strength of a received signal, and the base station 20 is capable of measuring RSSI of a signal received by each user terminal 10 and measuring RSSI of a signal received in the entire bandwidth. Because the RSSI contains noise and interference components, the received RSSI typically increases as the noise and interference components increase. Therefore, by using statistical analysis or simulation analysis on received RSSI values, it is possible to determine the influence of noise and interference components on the current received RSSI value. In order to determine the maximum MCS by the RSSI, a mapping table for the maximum MCS corresponding to the RSSI value received at the base station 20 using the statistical or simulation analysis described above may be created and determined. Table 3 is an example showing the maximum MCS mapping table.

RSSI MAX MCS 65536 28 131072 25 262144 22 524288 19 1048576 16

Since the maximum MCS mapping table value is a value determined by the modem design, many experimental results may be required. The maximum MCS mapping table may include a table corresponding to an RSSI value received for each user terminal 10 and a table corresponding to a received bandwidth RSSI value and may be used in each case. Up to that for maximum MCS determined according to the RSSI determined by the maximum MCS (MCS UE _ RSSI, max) value and the receive bandwidth RSSI value that is determined by the RSSI values measured for each of the user terminal (10) MCS (MCS CELL _ RSSI , max ) value among the values. The maximum MCS value of all the user terminals 10 may be adjusted using the RSSI value received in the entire band of the cell under operation or the maximum MCS value may be limited according to the received RSSI value of the individual user terminal 10 or the user terminal group can do. Thus, more efficient transmission control can be performed according to the channel environment of the cell operated.

4 is a flowchart illustrating a procedure of an uplink transmission power control method according to an embodiment of the present invention.

As shown in FIG. 4, the target SINR setting unit 110 sets a target SINR value to be applied to the base station 20 including the uplink transmission power control apparatus 100 (S110). Meanwhile, the SINR calculating unit 120 calculates the SRS SINR by measuring the SRS power periodically received from the user terminal 10 (S120). The user terminal control unit 130 controls the SRS transmission power value transmitted from the user terminal 10 so that the calculated SRS SINR has a value within a predetermined range set in advance from the target SINR (S130). The MCS setting unit 140 sets an MCS according to at least one user terminal using the SRS SINR value calculated by the SINR calculating unit 120 at step S140. Thereafter, the MCS resetting unit 150 resets the MCS set in the MCS setting unit 140 to fit the channel environment (S150), and the user terminal 10 performs communication with the base station 20 using the reset MCS can do.

Although the method has been described through particular embodiments, the method may also be implemented as computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission over the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily deduced by programmers of the present invention.

Although the present invention has been described in connection with some embodiments thereof, it should be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention as understood by those skilled in the art. something to do. It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

10: user terminal 20: base station
30: SON server 40: MME
50: management server 100: uplink transmission power control device
110: target SINR setting unit 120: SINR calculating unit
130: User terminal control unit 140: MCS setting unit
150: MCS reset government 151: Tables re-establishment government
152: Maximum MCS setting unit

Claims (9)

An uplink transmission power control apparatus comprising:
A target SINR setting unit for setting a target signal to interference noise ratio (SINR) to be applied to a base station including an uplink transmission power control apparatus;
A SINR calculator for measuring a SRS (Sounding Reference Signal) power value transmitted from at least one user terminal under the control of the BS and calculating a SRS signal to interference noise ratio (SRS) value using the measured SRS power; And
And controls the SRS transmission power for each of the at least one user terminal so that the SRS SINR value is within the set range. The method according to claim 1,
An MCS setting unit for setting an MCS according to the at least one user terminal using an MCS mapping table defining a modulation and coding scheme (MCS) value corresponding to the calculated SRS SINR value and SINR; And
And an MCS resetting unit for resetting the set MCS to be suitable for the channel environment. 3. The method of claim 2,
The MCS re-
Wherein the MCS is reset using a received signal strength indicator (RSSI), a block error rate (BLER), and a power headroom (PH) received at the base station. The method of claim 3,
The MCS re-
A table reconfiguration unit for changing the MCS value of the MCS mapping table using the BLER received by the base station; And
And a maximum MCS setting unit setting a maximum changeable MCS value of the at least one user terminal. 5. The method of claim 4,
The table re-
And changes an offset value to be used for changing the MCS mapping value in the MCS mapping table according to a relationship between a size of a BLER received by the base station and a predetermined minimum BLER and a maximum BLER value. 5. The method of claim 4,
Wherein the maximum MCS setting unit comprises:
And sets the maximum MCS value using a smaller value of the maximum MCS value by PH or the maximum MCS value by RSSI. The method according to claim 6,
Wherein the maximum MCS value by the PH is set using a PH value reported by the at least one user terminal to the base station, and the maximum MCS value by the RSSI is set by an RSSI value of the at least one user terminal Or sets a maximum MCS value by the RSSI using a smaller value of a reception bandwidth RSSI value in the entire RF reception band that the base station is under control of. A method for controlling uplink transmission power,
Setting a target signal to interference noise ratio (SINR) to be applied to a base station including an uplink transmission power control apparatus;
Measuring a SRS (Sounding Reference Signal) power value transmitted from at least one user terminal under the control of the BS and calculating a SRS signal to interference noise ratio (SINR) value using the measured SRS power value; And
And controlling the SRS transmission power for each at least one user terminal so that the SRS SINR value is within a set range. 9. The method of claim 8,
Setting an MCS according to the at least one user terminal using an MCS mapping table defining a modulation and coding scheme (MCS) value corresponding to the calculated SRS SINR value and SINR; And
And reconfiguring the set MCS to be suitable for the channel environment.
KR1020120156476A 2012-12-28 2012-12-28 Method and apparatus for controlling of uplink transmission power KR20140086238A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170114234A (en) * 2016-04-01 2017-10-13 한국전자통신연구원 Method and apparatus for controlling uplink transmission power
KR20220113123A (en) * 2021-02-05 2022-08-12 주식회사 엘지유플러스 Method and apparatus for performing up-link scheduling for user device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170114234A (en) * 2016-04-01 2017-10-13 한국전자통신연구원 Method and apparatus for controlling uplink transmission power
KR20220113123A (en) * 2021-02-05 2022-08-12 주식회사 엘지유플러스 Method and apparatus for performing up-link scheduling for user device

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