KR20210030171A - Method for controlling uplink transmission power in communication system and apparatus for the same - Google Patents

Abstract

The present invention relates to a method and an apparatus for controlling uplink transmission power in a communication system. The method for controlling uplink transmission power in a communication system includes the steps of: receiving system information from a base station; transmitting a random access preamble to the base station based on random access related information included in the system information; and receiving a random access response including a first timing advance (TA) value from the base station. Accordingly, the performance of communication system may be improved.

Description

A method and apparatus for controlling uplink transmission power in a communication system {METHOD FOR CONTROLLING UPLINK TRANSMISSION POWER IN COMMUNICATION SYSTEM AND APPARATUS FOR THE SAME}

The present invention relates to a communication system, and more particularly, to a method and apparatus for controlling uplink transmission power of a terminal in a communication system.

In the recent mobile communication environment, technology such as LTE-A, which is called the 4th generation communication system, is mainly used, and through this, high-capacity data can be transmitted and received to a wireless terminal. However, as consumers communicate more large amounts of data, it has brought about a rapid increase in the amount of data traffic, and various attempts are being made to increase the utilization of frequency resources in order to effectively process this. With these attempts, 5G communication systems are recently being developed.

The 5G communication system can provide a communication service using an ultra-high frequency band (eg, several GHZ to several tens of GHZ). In a 5G communication system using an ultra-high frequency band, a path loss may be greater than that of a 4G communication system. Beamforming applied to a 5G communication system can compensate for this path loss. Beamforming may be a technique for generating a dense beam by using a plurality of directional antennas or array antennas that radiate/receive signals only in a specific desired direction. The 5G communication system can perform a spatial filtering function that increases the directivity of signals only in a specific direction desired by beamforming. In addition, the 5G communication system can perform spatial multiplexing by combining and sending several signals together on a spatial channel.

Meanwhile, in the 5G communication system, transmission power can be controlled by adjusting the intensity of the downlink output of the base station and the uplink output of the terminal. In the 5G communication system, open loop power control or closed loop power control may be performed to control transmission power. Open loop power control may be performed by the terminal, and closed loop power control may be performed by instructing the base station or the base station to control the transmit power to the terminal.

In a 5G communication system, it is possible to minimize unnecessary power consumption of terminals existing in a cell through control of transmission power, and increase the operation timing of terminals. In addition, by controlling the transmission power, interference between terminals existing in a cell and interference between a plurality of cells can be minimized.

An object of the present invention for solving the above problems is to provide a method and apparatus for controlling uplink transmission power of a terminal according to a relative position of a terminal in a communication system.

A method for controlling uplink transmission power of a terminal according to an embodiment of the present invention for achieving the above object includes the steps of receiving system information from a base station, based on random access-related information included in the system information. Transmitting a random access preamble to a base station, receiving a random access response including a first TA (Timing Advance) value from the base station, based on the first TA value Obtaining a first uplink transmission coefficient, determining an uplink timing based on the first uplink transmission coefficient, determining an uplink transmission power based on the first TA value and uplink power information And transmitting an uplink channel using the uplink transmission power at the uplink timing.

Here, the uplink power information may include a partial power control factor at a reference point that is a preset point in a cell formed by the base station, and the partial power control factor at the reference point is included in the system information or It may be characterized in that it is stored in advance in the terminal.

Here, the determining of the uplink transmission power may further consider a second TA value that is a timing advance value at a reference point to determine the uplink transmission power, and the second TA value is included in the random access response. Or it may be characterized in that it is stored in advance in the terminal.

Here, the first TA value may be a timing advance value at the current location of the terminal.

Here, the determining of the uplink transmission power includes: estimating the path loss of the uplink based on the strength of the downlink received signal, and obtaining a second uplink transmission coefficient based on the first uplink transmission coefficient. Obtaining an increase ratio of the first partial power control factor based on the second uplink transmission coefficient and the first partial power control factor. Increasing the second uplink transmission coefficient and the first partial power control factor It may further include obtaining a second partial power control factor based on a ratio, and determining the uplink power based on the second partial power control factor and uplink control information.

Here, the operating method of the terminal includes, after transmitting the uplink channel, receiving a MAC CE (MAC Control Element) including a third TA value from the base station, and the third TA value and the first Re-determining the first uplink transmission coefficient based on an uplink transmission coefficient, re-determining the uplink timing based on the re-determined first uplink transmission coefficient, and the re-determined first uplink transmission coefficient; and It may further include re-determining the uplink power based on the uplink control information.

Here, the step of re-determining the uplink transmission power may include estimating the path loss of the uplink based on the strength of the downlink received signal, the re-determined first uplink transmission coefficient and the fourth TA value 4 obtaining an uplink transmission coefficient, obtaining an increase ratio of the third partial power control factor based on the fourth uplink transmission coefficient and a third partial power control factor included in the MAC CE, and the second It may further include the step of obtaining a fourth partial power control factor based on the 4 uplink transmission coefficient and the increase ratio of the third partial power control factor.

Here, it may further include re-determining the uplink power based on the fourth partial power control factor and the uplink control information.

A terminal according to another embodiment of the present invention may include a processor and a memory in which one or more commands executed by the processor are stored, and the one or more commands receive system information to the base station. And transmitting a random access preamble to the base station based on random access related information included in the system information, and random access including a first TA (Timing Advance) value from the base station Receiving a random access response, obtaining a first uplink transmission coefficient based on the first TA value, determining an uplink timing based on the first uplink transmission coefficient, and determining the first TA value And uplink transmission power may be determined based on uplink power information, and an uplink channel may be transmitted using the uplink transmission power at the uplink timing.

Here, the uplink power information may include a partial power control factor at a reference point that is a preset point in a cell formed by the base station, and the partial power control factor at the reference point is included in the system information or It may be characterized in that it is stored in advance in the terminal.

Here, when determining the uplink transmission power, the one or more commands are executed to determine the uplink transmission power by further considering a second TA value, which is a timing advance value at a reference point, and the second TA value is , It may be included in the random access response or may be characterized in that pre-stored in the terminal.

Here, when determining the uplink transmission power, the one or more commands estimate the uplink path loss based on the downlink received signal strength, and the second uplink transmission coefficient is based on the first uplink transmission coefficient. Obtaining a transmission coefficient, obtaining the first partial power control factor increase ratio based on the second uplink transmission coefficient and the first partial power control factor, and obtaining the second uplink transmission coefficient and the first partial power It may be further executed to obtain the second partial power control factor based on the control factor increase ratio.

Here, the one or more commands are, after transmitting the uplink channel, receiving a MAC CE (MAC Control Element) including a third TA value from the base station, and transmitting the third TA value and the first uplink It may be further executed to re-determine the first uplink timing based on a coefficient and re-determine the uplink power based on the re-determined first uplink transmission coefficient and the fourth TA value and the uplink control information.

A method of operating a base station according to another embodiment of the present invention includes transmitting a synchronization signal to a terminal, transmitting system information to the terminal, receiving a random access preamble from the terminal, and at a current location of the terminal. Random access including a first TA (timing advance) value, which is a timing advance value of and the uplink power control information, includes a second TA value that is a timing advance value of a reference point that is a preset point in a cell formed by the base station. It may include transmitting a response to the terminal and receiving an uplink channel from the terminal at an uplink timing determined by the first TA value.

Here, the system information may include random access preamble information and uplink power control information, and the uplink power control information includes a partial power control factor at a reference point required for the terminal to determine uplink transmission power. It may be characterized by including.

Here, the transmission power of the uplink channel may be determined based on uplink power information included in the system information, the first TA and the second TA.

Here, the operation method of the base station includes a third TA (timing advance) value, which is a timing advance value at the current location of the terminal, and a fourth TA, which is a reference point timing advance value required for the UE to re-determine uplink power. It may further include transmitting a MAC CE (MAC Control Element) including the value to the terminal.

According to the present invention, by controlling the uplink transmission power of the terminals using the reference point timing advance value, it is possible to reduce the load caused by transmission and reception of necessary information when controlling the uplink transmission power, and interference between adjacent cells or terminals is prevented. Can be reduced. Therefore, the performance of the communication system can be improved.

1 is a conceptual diagram showing a first embodiment of a communication system.
2 is a block diagram showing an embodiment of a communication node constituting a communication system.
3 is a conceptual diagram showing a second embodiment of a communication system.
4A is a flowchart illustrating a first embodiment of a method for a terminal to control uplink transmission power in a communication system.
4B is a flowchart illustrating a second embodiment of a method for a terminal to control uplink transmission power in a communication system.
5 is a conceptual diagram showing a first embodiment of a random access response in a communication system.
6 is a flowchart illustrating steps of performing an RRC connection establishment procedure between a terminal and a base station in a communication system.
7 is a flowchart illustrating a method of determining uplink transmission power in a communication system.
8 is a conceptual diagram showing a first embodiment of a MAC CE in a communication system.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate an overall understanding, the same reference numerals are used for the same elements in the drawings, and duplicate descriptions for the same elements are omitted.

1, the communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Here, the communication system may be referred to as a “communication network”. Each of the plurality of communication nodes may support at least one communication protocol. For example, each of the plurality of communication nodes is a communication protocol based on code division multiple access (CDMA), a communication protocol based on wideband CDMA (WCDMA), a communication protocol based on time division multiple access (TDMA), and frequency division multiple access (FDMA). access)-based communication protocol, OFDM (orthogonal frequency division multiplexing)-based communication protocol, OFDMA (orthogonal frequency division multiple access)-based communication protocol, SC (single carrier)-FDMA-based communication protocol, NOMA (non-orthogonal multiple) access)-based communication protocol, space division multiple access (SDMA)-based communication protocol, etc. may be supported. Each of the plurality of communication nodes may have the following structure.

2 is a block diagram showing an embodiment of a communication node constituting a communication system.

Referring to FIG. 2, the communication node 200 may include at least one processor 210, a memory 220, and a transmission/reception device 230 connected to a network to perform communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, and a storage device 260. Each of the components included in the communication node 200 may be connected by a bus 270 to communicate with each other. However, each of the components included in the communication node 200 may be connected through an individual interface or an individual bus based on the processor 210 instead of the common bus 270. For example, the processor 210 may be connected to at least one of the memory 220, the transmitting/receiving device 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 210 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured with at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may be composed of at least one of read only memory (ROM) and random access memory (RAM).

Referring back to FIG. 1, the communication system 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and a plurality of user equipment. ) (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong within the coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong within the coverage of the third base station 110-3. . The first terminal 130-1 may belong to the coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong within the coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a next generation Node B (gNB), a NodeB, and an advanced node B. (evolved NodeB), base transceiver station (BTS), radio base station, radio transceiver, access point, access node, road side unit (RSU), DU (digital unit), CDU (cloud digital unit), RRH (radio remote head), RU (radio unit), TP (transmission point), TRP (transmission and reception point), a relay node (relay node), etc. I can. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 is a terminal, an access terminal, a mobile terminal, It may be referred to as a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, and the like.

A plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) Each may support cellular communication (eg, long term evolution (LTE), advanced (LTE-A), 5G NR (new RAT), and the like specified in the 3rd generation partnership project (3GPP) standard). Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul or a non-ideal backhaul, and the ideal backhaul Alternatively, information can be exchanged with each other through non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to a core network (not shown) through an ideal backhaul or a non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to the corresponding terminal 130-1, 130-2, 130-3, 130 -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) is transmitted to the core network. Can be transferred to.

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can support OFDMA-based downlink transmission, and SC-FDMA-based uplink ) Can support transmission. In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits multiple input multiple output (MIMO) (e.g., single user (SU)-MIMO, Multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (COM) transmission, carrier aggregation transmission, transmission in an unlicensed band, direct device to device (D2D) ) Communication (or ProSe (proximity services), etc.) Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a base station Operation corresponding to (110-1, 110-2, 110-3, 120-1, 120-2), by base station (110-1, 110-2, 110-3, 120-1, 120-2) You can perform supported operations.

3 is a conceptual diagram showing a second embodiment of a communication system.

Referring to FIG. 3, the communication system may include a first base station 311, a second base station 312, a first mobile terminal 321, and a second mobile terminal 322. The first base station 311 and the second base station 312 of FIG. 3 may be configured to be the same as or similar to a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2. have. The first mobile terminal 321 and the second mobile terminal 322 of FIG. 3 are a plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 of FIG. ) And may be configured identically or similarly. The first mobile terminal 321 and the second mobile terminal 322 may exist in a cell formed by the first base station 311. The first mobile terminal 321 and the second mobile terminal 322 may support wireless LAN (WLAN). Terminals may be connected to each of the first and second mobile terminals 321 and 322 through WLANs supported by each of the first and second mobile terminals 321 and 322.

The uplink transmission time to the first base station 311 of each of the first mobile terminal 321 and the second mobile terminal 322 is the distance between the first base station 311 and the first mobile terminal 321 and the first base station. It may vary depending on the distance between 311 and the second mobile terminal 322. The uplink transmission delay time of the first mobile terminal 321 close to the first base station 311 may be shorter than the uplink transmission delay time of the second mobile terminal 322 far from the first base station 311. have.

The strength of the signal transmitted from the first base station 311 to each of the first mobile terminal 321 and the second mobile terminal 322 is determined by the distance between the first base station 311 and the first mobile terminal 321 and the first It may vary depending on the distance between the base station 311 and the second mobile terminal 322. That is, the path loss that occurs in the first mobile terminal 321 that is close to the first base station 311 is less than that of the second mobile terminal 322 that is far from the first base station 311. I can. Therefore, when the second mobile terminal 322 transmits an uplink signal/channel to the first base station 311, when the first mobile terminal 321 transmits an uplink signal/channel to the first base station 311 More power may be required.

When more transmission power is set in the second mobile terminal 322, interference with another adjacent cell (eg, a cell formed by the second base station 312) may increase. However, when setting uplink transmission power of the first mobile terminal 321 and the second mobile terminal 322 based on the reference point 330, which is a preset point in the cell formed by the first base station 311, adjacent It is possible to effectively control the problem of interference with other cells. Hereinafter, a method for controlling uplink transmission power of the terminal based on the reference point 330 present in the cell will be described in detail.

4A is a flowchart illustrating a first embodiment of a method for a terminal to control uplink transmission power in a communication system.

Referring to FIG. 4A, the communication system may include a terminal and a base station. Each of the terminal and the base station of FIG. 4A includes terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 and a plurality of base stations 110-1 and 110- shown in FIG. 2, 110-3, 120-1, 120-2). Alternatively, the terminal may be the mobile terminals 321 and 322 shown in FIG. 3. The terminal and the base station may be configured in the same or similar to the communication node 200 shown in FIG. 2.

The base station may generate a synchronization signal (S405). The synchronization signal may be a signal for synchronizing downlink timing between the terminal and the base station. The base station may transmit a synchronization signal to the terminal (S410). The terminal may receive a synchronization signal from the base station (S410). The terminal may perform downlink synchronization with the base station based on the synchronization signal received from the base station (S415).

In addition, the base station may generate system information (S420). System information includes uplink and downlink frequency bandwidths, parameters for random access procedures (eg, random access preamble information, etc.), and uplink power control information (eg, offset timing advance of the terminal). Value, the maximum uplink power of the terminal, the maximum number of physical resource blocks (PRBs) allocated to the terminal, the power allocated to each PRB, a partial power control factor at the reference point and a closed loop correction function), etc. can do.

The base station may transmit system information to the terminal (S425). Meanwhile, in the present specification, it is described that a synchronization signal and system information are respectively generated and transmitted to each terminal, but the synchronization signal and system information are an SS/PBCH block that is a single signal in which a synchronization signal and a physical broadcast channel (PBCH) are combined. I can.

The terminal may receive system information from the base station (S425). The terminal may generate a random access preamble based on a parameter for a random access procedure included in system information received from the base station (S430). The terminal may transmit a random access preamble to the base station (S435). The base station may receive a random access preamble from the terminal (S435).

The base station may generate a random access response based on the random access preamble received from the terminal (S440). The base station may transmit a random access response to the terminal (S445). Meanwhile, the random access response may be configured as follows.

5 is a conceptual diagram showing a first embodiment of a random access response in a communication system.

및

(reserved bit)을 포함할 수 있다.Referring to FIG. 5, a random access response is a Timing Advance Command (TAC), an uplink grant (UL (Up Link) grant), a Temporary (T) Radio Network Temporary Identifier (C-RNTI),

And

It may contain (reserved bit).

는 단말의 현재 위치에서의 타이밍 어드밴스 값인

를 포함할 수 있다. 기지국은

에 포함된

를 기초로 단말들의 상향링크 동기화를 수행할 수 있다. 단말은

을 기초로 상향링크 타이밍 보정 값인

를 획득할 수 있다. 단말들은

에 따라 기준 상향링크 타이밍을 보정할 수 있다. 단말은 보정된 상향링크 타이밍을 획득할 수 있고, 단말의 상향링크 타이밍의 동기화가 수행될 수 있다.

Is the timing advance value at the current location of the terminal

It may include. Base station

Contained in

Uplink synchronization of terminals may be performed based on. Terminal

Is an uplink timing correction value based on

Can be obtained. Terminals

According to this, the reference uplink timing can be corrected. The terminal may obtain the corrected uplink timing, and synchronization of the uplink timing of the terminal may be performed.

The UL grant may indicate resources allocated for the UE to transmit messages after the random access response. TC-RNTI may be an identifier used to identify a terminal in a cell formed by a base station.

는 상향링크 전송 전력 제어를 위하여 미리 설정된 기준점에서의 타이밍 어드밴스 값

을 포함할 수 있다. 단말은

에 포함된

,

에 포함된

및 시스템 정보에 포함된 부분 전력 제어 인자

를 기초로 단말의 상향링크 전력을 제어할 수 있다.

Is a timing advance value at a preset reference point for uplink transmission power control

It may include. Terminal

Contained in

,

Contained in

And a partial power control factor included in the system information

The uplink power of the terminal can be controlled based on.

가 포함되지 않은 경우, 단말은 미리 설정된

를 기초로 단말의 상향링크 전력을 제어할 수 있다.

는 단말에 미리 저장된 값일 수 있다.Meanwhile, on the system information

If is not included, the terminal is preset

The uplink power of the terminal can be controlled based on.

May be a value previously stored in the terminal.

Referring back to FIG. 4A, the terminal may receive a random access response from the base station (S445). The terminal may determine the uplink timing of the terminal based on the random access response received from the base station (S450).

을 기초로 단말의 현재 위치에서의 상향링크 타이밍을 결정할 수 있다. 기준 상향링크 타이밍은 단말의 하향링크 타이밍과 동일한 것으로 추정할 수 있다.The terminal is included in the random access response received from the base station.

The uplink timing at the current location of the terminal may be determined based on. The reference uplink timing can be estimated to be the same as the downlink timing of the terminal.

을 기초로 단말의 현재 위치에서의 상향링크 타이밍을 결정할 수 있다.That is, the UE can obtain the downlink timing based on the downlink signal/channel received from the base station, and can estimate the obtained downlink timing as the reference uplink timing. The terminal is the estimated reference uplink timing and

The uplink timing at the current location of the terminal may be determined based on.

를 기초로 아래 수학식 1에 따라 단말의 현재 위치에서의 상향링크 전송 계수인

를 획득할 수 있다.Terminal

Based on Equation 1 below, which is an uplink transmission coefficient at the current location of the terminal

Can be obtained.

는 단말의 현재 위치에서의 상향링크 전송 계수일 수 있고,

는 단말의 현재 위치에서의 타이밍 어드밴스 값일 수 있으며,

는 뉴머놀러지(numerology)일 수 있다.

는 0 내지 4 가운데 어느 하나일 수 있다.In Equation 1

May be an uplink transmission coefficient at the current location of the terminal,

May be a timing advance value at the current location of the terminal,

May be numerology.

May be any one of 0 to 4.

및 시스템 정보를 통해 획득한

를 기초로 아래 수학식 2에 따라 단말의 현재 위치에서의 상향링크 타이밍의 보정 값인

를 획득할 수 있다. 만일, 단말이 시스템 정보를 통해

값을 획득하지 못한 경우, 단말은 미리 설정된

을 기초로

를 획득할 수 있다.The terminal is obtained in Equation 1

And acquired through system information

Based on Equation 2 below, which is a correction value of the uplink timing at the current location of the terminal

Can be obtained. If, through the system information, the terminal

If the value is not obtained, the terminal is

Based on

Can be obtained.

는 단말의 현재 위치에서의 상향링크 타이밍 보정 값일 수 있고,

는 단말의 현재 위치에서의 상향링크 전송 계수일 수 있으며,

은 단말의 타이밍 오프셋에 의한 상향링크 전송 계수일 수 있고, 미리 설정된 값일 수 있다.

는

를 연산하기 위한 상수일 수 있고, 미리 설정된 값일 수 있다.In Equation 2

May be an uplink timing correction value at the current location of the terminal,

May be an uplink transmission coefficient at the current location of the terminal,

May be an uplink transmission coefficient based on a timing offset of the terminal, and may be a preset value.

Is

It may be a constant for calculating and may be a preset value.

When the uplink timing is determined, the UE may perform a radio resource control (RRC) connection establishment procedure with the base station (S455).

6 is a flowchart illustrating steps of performing an RRC connection establishment procedure between a terminal and a base station in a communication system.

The terminal may generate an RRC connection request message (S605). The terminal may transmit the generated RRC connection request message to the base station (S610). The base station may receive an RRC connection request message from the terminal (S610). The base station may generate an RRC connection setup message in response to the RRC connection request message (S615).

The base station may transmit the generated RRC connection setup message to the terminal (S620). The terminal may receive an RRC connection setup message from the base station (S620). The terminal may receive the RRC connection setup message and operate in the RRC connection mode. When the RRC connection of the terminal is successfully performed, the terminal may generate an RRC connection setup completion message (S625). The terminal may transmit the generated RRC connection complete message to the base station (S630).

The base station may receive an RRC connection setup complete message from the terminal (S630), and an RRC connection between the base station and the terminal may be established.

4B is a flowchart illustrating a second embodiment of a method for a terminal to control uplink transmission power in a communication system.

The base station and the terminal of FIG. 4b may be configured in the same or similar to the base station and the terminal of FIG. 4a.

Referring to FIG. 4B, the base station may generate a downlink control information (DCI) message (S460). The downlink control information includes uplink power control information of the terminal (e.g., the maximum uplink power of the terminal, the number of physical resource blocks (PRBs) allocated to the terminal, the power allocated to each PRB, and the MCS offset value of the terminal terminal Uplink resource allocation information, path loss compensation factor) and an uplink transmission power control command.

The base station may transmit the generated downlink control information to the terminal (S465). The terminal may receive downlink control information from the base station (S465). The terminal may determine the uplink power of the terminal based on downlink control information received from the base station, system information received from the base station in step S425, and a random access response received from the base station in step S445 (S470).

7 is a flowchart illustrating a method of determining uplink transmission power in a communication system.

Referring to FIG. 7, the UE may measure downlink reception power (S705). The terminal may measure the downlink reception power of the terminal based on the downlink signal and/or channel received from the base station. The terminal may estimate a downlink path loss of the terminal based on the measured downlink reception power (S710). The UE may estimate that the downlink path loss is the same as the uplink path loss.

를 획득할 수 있다(S715). 단말은 기준점에서의 상향링크 전송 계수 및 미리 설정된 기준점에서의 부분 전력 제어 인자를 기초로 기준점에서의 부분 전력 제어 인자의 증가비인

를 아래 수학식 3을 기초로 획득할 수 있다.The terminal is the increase ratio of the partial power control factor at the reference point.

Can be obtained (S715). The terminal is based on the uplink transmission coefficient at the reference point and the partial power control factor at the preset reference point, which is the increase ratio of the partial power control factor at the reference point.

Can be obtained based on Equation 3 below.

는 기준점에서의 부분 전력 제어 인자 증가비일 수 있다.

는 기준점에서의 부분 전력 제어 인자일 수 있다.

는 기지국으로부터 수신한 시스템 정보를 통해 획득될 수 있다. 만일, 단말이 시스템 정보를 통해

를 획득할 수 없는 경우, 단말은 미리 설정된

값을 기초로

를 획득할 수 있다.

는 단말에 미리 저장되어 있는 값일 수 있다.In Equation 3,

May be an increase ratio of the partial power control factor at the reference point.

May be a partial power control factor at the reference point.

May be obtained through system information received from the base station. If, through the system information, the terminal

If it is not possible to obtain, the terminal is

Based on value

Can be obtained.

May be a value previously stored in the terminal.

는 0.5일 수 있다.

는 기준점에서의 상향링크 전송 계수일 수 있다. 단말은 아래 수학식 4를 기초로

를 획득할 수 있다.E.g,

May be 0.5.

May be an uplink transmission coefficient at the reference point. The terminal is based on Equation 4 below.

Can be obtained.

는 기준점에서의 상향링크 전송 계수일 수 있고,

는 단말의 현재 위치에서의 상향링크 전송 계수일 수 있고,

는 기준점의 타이밍 어드밴스 값일 수 있고,

는 뉴머놀러지일 수 있다.

는 0 내지 4 가운데 어느 하나일 수 있다.

는 랜덤 액세스 응답을 통해 획득될 수 있다.In Equation 4,

May be an uplink transmission coefficient at the reference point,

May be an uplink transmission coefficient at the current location of the terminal,

May be the timing advance value of the reference point,

May be neurology.

May be any one of 0 to 4.

May be obtained through a random access response.

가 포함되지 않을 수 있다. 랜덤 액세스 응답에

가 포함되지 않은 경우, 단말은 미리 설정된

을 기초로

을 획득할 수 있다.

는 단말에 미리 저장된 값일 수 있다.Meanwhile, in the random access response

May not be included. Random access response

If is not included, the terminal is preset

Based on

Can be obtained.

May be a value previously stored in the terminal.

가 저장되어 있지 아니한 경우, 단말은 기지국으로부터 수신한 단말의 타이밍 어드밴스 값(

)을

로 설정할 수 있다.Furthermore, the preset

If is not stored, the terminal is a timing advance value of the terminal received from the base station (

)of

Can be set to.

를 획득할 수 있다(S720).The terminal is a partial power control factor at the current position of the terminal by Equation 5 below.

Can be obtained (S720).

는 0.5인 경우, 이때, 수학식 4에 따라 단말의 현재 위치에서의 부분 전력 제어 값

는 0.625일 수 있다.For example, the coverage of the cell formed by the base station is 1000m, the reference point is 500m away from the base station, and the terminal is 250m away from the base station,

Is 0.5, at this time, the partial power control value at the current location of the terminal according to Equation 4

May be 0.625.

는 0.875일 수 있다.On the other hand, the coverage of the cell formed by the base station is 1000m, the reference point is 500m away from the base station, and the terminal is 750m away from the base station,

May be 0.875.

The terminal is based on the path loss estimated in step S710, the system information received from the base station, the information included in the random access response and downlink control information, and the partial power control factor at the current location of the terminal obtained in step S720. Uplink transmission power at the current location of may be obtained (S725). The uplink transmission power at the current location of the terminal may be obtained by Equation 6 below.

는 기준 상향링크 전송 전력일 수 있으며,

는 단말의 상향링크 전송 전력의 최대 값일 수 있으며,

은 단말에 할당된 PRB들의 최대 개수일 수 있고,

는 각각의 PRB에 할당된 전력일 수 있으며,

은 S710단계에서 측정된 경로 손실일 수 있고,

는 수학식 6에서 획득한 단말의 현재 위치에서의 부분 전력 제어 인자일 수 있으며,

는 단말의 MCS 오프셋 값일 수 있고,

는 폐쇄 루프(closed loop) 보정 함수일 수 있다.In Equation 6,

May be the reference uplink transmission power,

May be the maximum value of the uplink transmission power of the terminal,

May be the maximum number of PRBs allocated to the terminal,

May be the power allocated to each PRB,

May be the path loss measured in step S710,

May be a partial power control factor at the current location of the terminal obtained in Equation 6,

May be the MCS offset value of the terminal,

May be a closed loop correction function.

,

,

,

및

)은 시스템 정보, 랜덤 액세스 응답, 하향링크 제어 정보 및 MAC CE(도 8 참조) 가운데 하나 이상을 통해 기지국으로부터 수신될 수 있다.Parameters defined in Equation 4 (for example,

,

,

,

And

) May be received from the base station through one or more of system information, random access response, downlink control information, and MAC CE (see FIG. 8).

Referring back to FIG. 4B, the UE may transmit an uplink signal/channel using the uplink transmission power determined in S470 at the uplink timing determined in S450 (S475). The base station may receive an uplink signal/channel from the terminal (S475).

Meanwhile, the base station may generate a MAC CE (MAC control element) including TAC when it is necessary to change the uplink timing (S480). The base station may transmit the generated MAC CE to the terminal (S485). MAC CE can be configured as follows.

8 is a conceptual diagram showing a first embodiment of a MAC CE in a communication system.

(Time Advance Group identifier) 및

및

및

(reserved bit)을 포함할 수 있다.The terminal and the base station of FIG. 8 may be configured in the same or similar to the terminal and the base station of FIG. 4a. Referring to Figure 8, the MAC CE

(Time Advance Group identifier) and

And

And

It may contain (reserved bit).

는

를 나타내는 식별자일 수 있다.

는 상향링크 타이밍의 차이가 미리 설정한 값 이하인 단말들의 그룹일 수 있다. 또한

는

의 타이밍 어드밴스 값인

을 포함할 수 있다. 단말은

를 기초로 상향링크 타이밍을 재결정할 수 있다.

Is

It may be an identifier indicating.

May be a group of terminals in which the difference in uplink timing is less than or equal to a preset value. Also

Is

Which is the timing advance value of

It may include. Terminal

The uplink timing may be re-determined based on.

는 상향링크 전송 전력 제어를 위하여 미리 설정된 기준점에서의 타이밍 어드밴스 값인

을 포함할 수 있다. 단말은

에 포함된

,

에 포함된

및 시스템 정보에 포함된

를 기초로 단말의 상향링크 전력을 제어할 수 있다. 만일, 단말이 시스템 정보를 통하여 부분 전력 제어 인자

를 획득하지 못한 경우, 단말은 미리 설정된

를 기초로 단말의 상향링크 전력을 제어할 수 있다.

Is a timing advance value at a preset reference point for uplink transmission power control.

It may include. Terminal

Contained in

,

Contained in

And system information

The uplink power of the terminal can be controlled based on. If the terminal uses the system information, the partial power control factor

If not obtained, the terminal is set in advance

The uplink power of the terminal can be controlled based on.

를 기초로 단말의 상향링크 전송 계수

를 재결정할 수 있다.Referring back to FIG. 4B, the terminal may receive the MAC CE from the base station (S485). The UE may re-determine the uplink timing based on the information included in the MAC CE (S490). The terminal is included in the MAC CE according to Equation 8 below.

Uplink transmission coefficient of the terminal based on

Can be re-determined.

는 재결정된 단말의 상향링크 전송 계수일 수 있다.

는 단말의 현재 위치에서의 상향 링크 타이밍 어드밴스 값 계산 과정을 통해 획득한 상향링크 전송 계수(예를 들어, 도 5의 수학식 1을 통해 획득한

)일 수 있다.

는 MAC CE에 포함된 단말의 타이밍 어드밴스 값일 수 있다.

는 뉴머놀러지일 수 있다.

는 0 내지 4 가운데 어느 하나일 수 있다. 단말은 수학식 7에서 획득한

및 시스템 정보를 통해 획득한

를 기초로 수학식 2(도 5 참조)에 따라 단말의 현재 위치에서의 상향링크 타이밍의 보정 값인

를 획득할 수 있다.In Equation 7,

May be the re-determined uplink transmission coefficient of the terminal.

Is the uplink transmission coefficient obtained through the process of calculating the uplink timing advance value at the current location of the terminal (for example, obtained through Equation 1 in FIG.

) Can be.

May be a timing advance value of the terminal included in the MAC CE.

May be neurology.

May be any one of 0 to 4. The terminal is obtained in Equation 7

And acquired through system information

Based on Equation 2 (see FIG. 5), which is a correction value of the uplink timing at the current location of the terminal

Can be obtained.

을 획득하지 못한 경우, 단말은 미리 설정된

을 기초로

를 획득할 수 있다. Meanwhile, the terminal

If not obtained, the terminal is set in advance

Based on

Can be obtained.

가 기준점 정보(예를 들어, 기준점 타이밍 어드밴스 값인

)를 포함한 경우 수학식 1(도 5 참조)에 따라 기준점 타이밍 어드밴스 보정 값을 재 결정할 수 있다.The terminal of the MAC CE

Is the reference point information (for example, the reference point timing advance value,

), the reference point timing advance correction value may be re-determined according to Equation 1 (refer to FIG. 5).

를 기초로 전술한 S470에 따라 상향링크 전송 전력을 재결정할 수 있다. 단말은 S490에서 재결정된 상향링크 타이밍과 상향링크 전송 전력에 기초하여 상향링크 신호/채널을 전송할 수 있다.The terminal may re-determine the uplink transmission power based on the information included in the MAC CE (S495). Terminal

The uplink transmission power may be re-determined according to S470 described above. The UE may transmit an uplink signal/channel based on the uplink timing and uplink transmission power re-determined in S490.

The methods according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the computer-readable medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software.

Examples of computer-readable media include hardware devices specially configured to store and execute program instructions, such as rom, ram, flash memory, and the like. Examples of program instructions include machine language codes such as those produced by a compiler, as well as high-level language codes that can be executed by a computer using an interpreter or the like. The above-described hardware device may be configured to operate as at least one software module to perform the operation of the present invention, and vice versa.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention described in the following claims. I will be able to.

Claims (16)

As a method of operating a terminal in a communication system,
Receiving system information from a base station;
Transmitting a random access preamble to the base station based on random access related information included in the system information;
Receiving a random access response including a first TA (Timing Advance) value from the base station;
Obtaining a first uplink transmission coefficient based on the first TA value;
Determining an uplink timing based on the first uplink transmission coefficient;
Determining uplink transmission power based on the first TA value and uplink power information; And
And transmitting an uplink channel using the uplink transmission power at the uplink timing. The method according to claim 1,
The uplink power information,
A partial power control factor at a reference point that is a preset point in the cell formed by the base station;
The partial power control factor at the reference point is,
The operating method of the terminal, characterized in that included in the system information or stored in advance in the terminal. The method according to claim 1,
The step of determining the uplink transmission power,
Determining the uplink transmission power by further considering a second TA value, which is a timing advance value at a reference point;
The second TA value is,
The method of operating a terminal, characterized in that included in the random access response or pre-stored in the terminal. The method according to claim 1,
The first TA value is a timing advance value at a current location of the terminal. The method according to claim 1,
The step of determining the uplink transmission power,
Estimating the uplink path loss based on the downlink received signal strength;
Obtaining a second uplink transmission coefficient based on the first uplink transmission coefficient;
Obtaining an increase ratio of the first partial power control factor based on the second uplink transmission coefficient and the first partial power control factor;
Obtaining a second partial power control factor based on the second uplink transmission coefficient and an increase ratio of the first partial power control factor; And
Determining the uplink power based on the second partial power control factor and uplink control information. The method according to claim 1,
The operating method of the terminal,
After transmitting the uplink channel, receiving a MAC CE (MAC Control Element) including a third TA value from the base station;
Re-determining the first uplink transmission coefficient based on the third TA value and the first uplink transmission coefficient;
Re-determining the uplink timing based on the re-determined first uplink transmission coefficient; And
And re-determining the uplink power based on the re-determined first uplink transmission coefficient and the uplink control information. The method of claim 6,
Re-determining the uplink transmission power,
Estimating the uplink path loss based on the downlink received signal strength;
Obtaining a fourth uplink transmission coefficient based on the re-determined first uplink transmission coefficient and a fourth TA value;
Obtaining an increase ratio of the third partial power control factor based on the fourth uplink transmission coefficient and a third partial power control factor included in the MAC CE;
Obtaining a fourth partial power control factor based on the fourth uplink transmission coefficient and an increase ratio of the third partial power control factor; And
And re-determining the uplink power based on the fourth partial power control factor and the uplink control information. As a terminal of a communication system,
Processor and
And a memory in which one or more instructions executed by the processor are stored,
The one or more commands,
Receive system information to the base station;
Transmitting a random access preamble to the base station based on random access-related information included in the system information;
Receiving a random access response including a first TA (Timing Advance) value from the base station;
Obtaining a first uplink transmission coefficient based on the first TA value;
Determining an uplink timing based on the first uplink transmission coefficient;
Determining uplink transmission power based on the first TA value and uplink power information; And,
A terminal transmitting an uplink channel using the uplink transmission power at the uplink timing. The method of claim 8,
The uplink power information,
A partial power control factor at a reference point that is a preset point in the cell formed by the base station;
The partial power control factor at the reference point is,
A terminal, characterized in that included in the system information or stored in advance in the terminal. The method of claim 8,
When determining the uplink transmission power,
The one or more commands,
Executing to determine the uplink transmission power by further considering a second TA value, which is a timing advance value at a reference point; And,
The second TA value is included in the random access response or previously stored in the terminal. The method of claim 8,
When determining the uplink transmission power,
The one or more commands,
Estimating the uplink path loss based on the downlink received signal strength;
Obtaining a second uplink transmission coefficient based on the first uplink transmission coefficient;
Obtaining the first partial power control factor increase ratio based on the second uplink transmission coefficient and the first partial power control factor; And,
The terminal further executed to obtain a second partial power control factor based on the second uplink transmission coefficient and the increase ratio of the first partial power control factor. The method of claim 8,
The one or more commands,
After transmitting the uplink channel,
Receiving a MAC CE (MAC Control Element) including a third TA value from the base station;
Re-determining the first uplink timing based on the third TA value and the first uplink transmission coefficient; And,
The terminal further executed to re-determine the uplink power based on the re-determined first uplink transmission coefficient and the fourth TA value and the uplink control information. A method of operation of a base station in a communication system,
Transmitting a synchronization signal to the terminal;
Transmitting system information to the terminal;
Receiving a random access preamble from the terminal;
The first TA value, which is a timing advance value at the current location of the terminal, and the uplink power control information, is a second TA value that is a timing advance value of a reference point, which is a preset point in a cell formed by the base station. Transmitting a random access response including a to the terminal; And
Receiving an uplink channel from the terminal at an uplink timing determined by the first TA value;
Operation method of the base station comprising a. The method of claim 13,
The system information includes random access preamble information and uplink power control information,
The uplink power control information includes a partial power control factor at a reference point required for the terminal to determine uplink transmission power. The method of claim 13,
The transmission power of the uplink channel is determined based on uplink power information included in the system information, the first TA and the second TA. The method of claim 15,
The operation method of the base station,
MAC CE (MAC Control) including a third TA (timing advance) value that is a timing advance value at the current location of the UE and a fourth TA value that is a reference point timing advance value required for the UE to re-determine uplink power. Element) to the terminal operating method of the base station further comprising the step of transmitting.

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