KR100854513B1 - Method and system for automatically setting initial power through random access channel - Google Patents
Method and system for automatically setting initial power through random access channel Download PDFInfo
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- KR100854513B1 KR100854513B1 KR1020070045139A KR20070045139A KR100854513B1 KR 100854513 B1 KR100854513 B1 KR 100854513B1 KR 1020070045139 A KR1020070045139 A KR 1020070045139A KR 20070045139 A KR20070045139 A KR 20070045139A KR 100854513 B1 KR100854513 B1 KR 100854513B1
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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Abstract
A method and system for automatically setting initial transmit power over a random access channel are provided.
According to an embodiment of the present invention, a method for automatically setting initial transmission power through a random access channel may include: automatically setting, by a mobile communication network, a predetermined constant value for calculating an initial transmission power of a mobile terminal; Transmitting, by the mobile communication network, the set constant value to the mobile terminal; And calculating, by the mobile terminal, the initial transmission power using the received constant value.
Description
1 is a diagram illustrating a general initial access procedure in a mobile communication system.
2 is a diagram illustrating ramping of initial transmit power through a general random access channel.
3 is a diagram comparing a normal case and an abnormal case of transmission of a preamble.
4 is a flowchart illustrating a method for automatically setting initial transmit power through a random access channel according to an embodiment of the present invention.
5 is a diagram illustrating a system for automatically setting initial transmit power through a random access channel according to an embodiment of the present invention.
(Description of the main parts of the drawing)
100: mobile terminal 200: mobile communication network
210: base station 220: base station controller
230: core network 240: home location register (HLR)
The present invention relates to the control of the initial transmission power in the mobile communication system, and more particularly, the optimal initial power for each cell to transmit the preamble by using a constant value automatically designated by the mobile communication network for each cell A method and system for automatically setting initial transmit power over a random access channel capable of calculating an initial transmit power value.
Today, there are three major mobile communication systems worldwide. First, the Global System for Mobile Communication (GSM) system centered on Europe, the second generation mobile communication system, and Second, the synchronous CDMA (Code Division Multiple Access) 2000 system centered on Korea and the US, the third generation system, and Third, Europe, the third generation system. The central UMTS (Universal Mobile Telecommunication Services) system is used.
UMTS, the third generation mobile communication system called IMT-2000 in Europe, is leading the standardization in the 3GPP (3 Generation Partnership Project). It is a personal communication service using asynchronous technology based on GSM method. The UMTS mobile communication system has a big difference in that it does not use a Global Position System (GPS) for synchronization compared to other 3G system CDMA 2000 systems, and thus is called an asynchronous mobile communication system.
The asynchronous mobile communication system is a standard developed by combining CDMA technology with European GSM. The UMTS system integrates various systems such as cellular, wireless telephone, wireless LAN and satellite communication, and provides international roaming to make a call anywhere in the world. In addition, it supports multimedia services such as voice and image data at variable rates of up to 2Mbps, and is used in the same requirements and the same frequency band as IMT-2000, such as interworking with various broadband networks.
In such a UMTS system, when a mobile terminal initially accesses a wireless network, the mobile terminal transmits a signal through a random access channel (RACH). Since the random access channel is shared and used by a plurality of mobile terminals, collision may occur. When multiple mobile stations transmit signals on a random access channel at the same time, collisions occur and the base station cannot recover the signals. Therefore, a plurality of preambles are transmitted before sending a message for minimizing the collision of the random access channel. The transmission power of these preambles is changed to increase the initial access success probability of the mobile terminal.
However, since the maximum transmit power of the mobile terminal using the CDMA system is not limited, high power of 23 dBm or more may be used in the edge section of the cell, and the initial transmit power may be set high because the preamble and the message are simultaneously transmitted. However, in the WCDMA system, which can be called a wireless access method in the UMTS system, the initial transmission power is limited to 24 dBm and does not require a high initial transmission power value because only the preamble is transmitted without transmitting a message during the initial access. . As a result, when the initial transmission power setting error occurs in the WCDMA system, excessive maximum transmission power is transmitted in the edge section of the cell, and the overall transmission power of the mobile terminal is increased, causing unnecessary interference to adjacent cells. have.
SUMMARY OF THE INVENTION The present invention has been devised to solve the above problems, and the technical problem to be solved by the present invention is an excessive initial transmission power that is more than necessary by automatically calculating different initial transmission power values for each cell based on a parameter set by a system operator. The present invention provides a method and system for automatically setting initial transmission power through a random access channel, which can minimize interference of other adjacent cells and contribute to improving call traffic.
The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.
According to an embodiment of the present invention, a method for automatically setting initial transmission power through a random access channel according to an embodiment of the present invention may determine whether a mobile communication network automatically sets a predetermined constant value for calculating an initial transmission power of a mobile terminal. Automatically setting the constant value in accordance with a first parameter indicating whether or not; Transmitting, by the mobile communication network, the set constant value to the mobile terminal; And calculating, by the mobile terminal, the initial transmit power using the received constant value, wherein the constant value includes: a primary CPICH DL Tx power of the common pilot channel and a value of the common pilot channel; It is automatically set using the received signal code power value CPICH_RSCP and the uplink interference value (UL Interference).
Preferably, prior to the automatic setting, the first parameter, a second parameter indicating a specific value within a range of a received signal code power value of the mobile terminal, and the mobile communication network set the constant value. Setting a third parameter indicating whether to periodically transmit to the mobile terminal.
In addition, the automatic setting system of the initial transmission power through the random access channel according to an embodiment of the present invention for achieving the above object, indicating whether to automatically set a predetermined constant value for calculating the initial transmission power A mobile communication network for automatically setting the constant value according to a first parameter; And a mobile terminal configured to receive the set constant value from the mobile communication network to calculate the initial transmission power, wherein the constant value includes: a primary CPICH DL Tx power of a common pilot channel and a value of the common pilot channel; It is automatically set using the received signal code power value CPICH_RSCP and the uplink interference value (UL Interference).
Preferably, the constant value may be set for each cell of the mobile communication network.
Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and are common in the art to which the present invention pertains. It is provided to fully inform those skilled in the art of the scope of the invention, which is to be defined only by the scope of the claims. Like reference numerals refer to like elements throughout.
The random access channel (RACH) used in the UMTS system is an uplink random access channel, which is a channel for accessing a mobile terminal to UTRAN, which is a mobile communication network. The RACH is mainly used for transmitting a Radio Resource Control (RRC) connection message for accessing the UTRAN when the mobile terminal is paged or attempts to make a call. In addition, the RACH is used to update or update the cell when the mobile terminal is connected to the UTRAN. In case of transmitting UTRAN Registration Area (UPRAN) update message, it is used in case of transmitting very small data in Cell_FACH (Forward Access Channel) state.
The transmission of the preamble through the random access channel and the transmission of the preamble detection information through the Acquisition Indication Channel (AICH), which is a response thereof, will be briefly described with reference to FIGS. 1 and 2.
FIG. 1 is a diagram illustrating a general initial access procedure in a mobile communication system, and FIG. 2 is a diagram illustrating ramping of initial transmit power through a general random access channel.
Referring to FIG. 1, a preamble configured by a specific bit string as a base station in a
<Equation 1>
P initial _power = Primary CPICH DL TX Power-CPICH_RSCP + UL_Interference + Constant Value.
In Equation 1, P initial _ power means an initial transmit power value for transmitting the RACH preamble, Primary CPICH DL TX Power means a transmit power value of the primary Common Channel (CPICH), CPICH_RSCP of the CPICH Received Signal Code Power (RSCP) value, UL_Interference means UL (UpLink) interference value, Constant Value means a constant value.
Here, Primary CPICH DL TX Power, UL_Interference, which is an uplink interference value, and Contant Value, which is a constant value, are values included in a system information message transmitted from the
Thereafter, if the
If the
However, when the
<Equation 2>
P n = P initial _power + (n-1) * P ramping
Here, n is the number of times the
Meanwhile, referring back to FIG. 2, the
Therefore, when the base station recognizes the n-
Now, a case in which the transmission of the preamble transmitted by the
First, the transmission point of the maximum transmission power of the
24 = 33-CPICH_RSCP + (-105) + (-20),
CPICH_RSCP = -116 dBm.
That is, the
Referring to FIG. 3, which compares a normal case with an abnormal case of transmission of the preamble, as shown in the
Therefore, the constant value (Constant Value) in Equation (1) is automatically assigned to the
4 is a flowchart illustrating a method for automatically setting initial transmit power through a random access channel according to an embodiment of the present invention.
First, the system operator may include a first parameter indicating whether to automatically set a Constant Value of Equation 1, and a second value indicating a specific value within a range of an RSCP value of the
In the
First, assuming that the second parameter value is -119dBm, the Primary CPICH DL Tx Power is 35dBm, and the UL_Interference is -104 when the first parameter has an On value, the base station controller is as follows. The equation will automatically calculate the constant value.
ConstantValue = 24-Primary CPICH DL Tx Power + CPICH_RSCP-UL Interference.
Here, the Primary CPICH DL Tx Power means a transmission power value of a common pilot channel (CPICH), the CPICH_RSCP is an RSCP value of the common pilot channel means a value specified by the second parameter, the UL Interference is Means uplink (UL) interference value. Substituting a numerical value into the above equation results in ConstantValue = 24-35 + (-119)-(-104), and a constant value of -26 is automatically obtained.
Now, the
The
5 is a diagram illustrating a system for automatically setting initial transmit power through a random access channel. Referring to FIG. 5, the automatic configuration system includes a
The
The
Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.
According to the embodiment of the present invention as described above one or more of the following effects exist.
By automatically calculating different initial transmit power values for each cell based on the parameters set by the system operator, it is possible to minimize interference of other adjacent cells due to excessive initial transmit power more than necessary and contribute to improving call traffic rate.
The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.
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KR20060040948A (en) * | 2004-11-08 | 2006-05-11 | 삼성전자주식회사 | The prach ramping method for preamble power level selection of user |
KR20070041235A (en) * | 2005-10-14 | 2007-04-18 | 삼성전자주식회사 | Transmission power control method for physical random access channel |
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KR20060040948A (en) * | 2004-11-08 | 2006-05-11 | 삼성전자주식회사 | The prach ramping method for preamble power level selection of user |
KR20070041235A (en) * | 2005-10-14 | 2007-04-18 | 삼성전자주식회사 | Transmission power control method for physical random access channel |
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