KR102206361B1 - Apparatus and method for performing uplink power control in wireless communication system supporting carrier aggregation - Google Patents

Abstract

The present invention relates to an apparatus and method for performing uplink power control in a wireless communication system supporting carrier aggregation.
This specification includes the steps of receiving a higher layer message from a base station including a first TPC index for a PUCCH (PCell) and a second TPC index for a PUCCH (SCell), a first TPC corresponding to the first TPC index Receiving a command and a second TPC command corresponding to the second TPC index from the base station, and controlling power of the PUCCH (PCell) based on the first TPC command, and based on the second TPC command A power control method including controlling power of the PUCCH (SCell) is posted.

Description

Device and method for performing uplink power control in a wireless communication system supporting carrier aggregation {APPARATUS AND METHOD FOR PERFORMING UPLINK POWER CONTROL IN WIRELESS COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION}

The present invention relates to wireless communication, and more particularly, to an apparatus and method for performing uplink power control in a wireless communication system supporting carrier aggregation.

Carrier aggregation (CA) supports a plurality of carriers and is also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are referred to as component carriers (CC). Each component carrier is defined by a bandwidth and a center frequency. When CA is used, a plurality of physically continuous or non-continuous bands in the frequency domain can be grouped together to achieve the same effect as using a logically large band.

The CA technology basically requires a primary serving cell (PCell) serving as an anchor for communication and a secondary serving cell (SCell) secondary to it. In the existing long term evolution (LTE), an uplink control channel such as a physical uplink control channel (PUCCH) is transmitted only in the primary serving cell. However, in recent LTE Rel.13, the addition of a technical feature for reinforcing CA is being considered, and as an example, a method in which PUCCH is transmitted even in a secondary serving cell may be mentioned. If PUCCH is additionally configured in a secondary serving cell other than the primary serving cell, a small cell that reduces overhead due to uplink control information (UCI) concentrated to the primary serving cell and provides efficient uplink transmission is It can help you deploy. As a result, it is possible to implement reliable transmission of uplink control signals.

Meanwhile, the uplink transmission power control of the terminal is a technology for solving interference or attenuation according to the distance between the terminal and the base station, and is also called a transmission power control (TPC) command. In addition, the TPC command is signaling transmitted to the terminal in order for the base station to perform power control of a PUCCH or a physical uplink shared channel (PUSCH). Due to the TPC command, the base station can receive an uplink signal with a uniform power intensity.

Currently, both the CA-supported terminal and the CA-non-supported terminal are applied with a TPC command for PUCCH or PUSCH through the common control region of the primary serving cell. However, PUCCH (SCell) or PUSCH, a new feature added in LTE Rel. Until then, no discussion has been made on whether or not the TPC command is applied. In order to effectively support the CA of LTE Rel.13, power control for the PUCCH or PUSCH configured in the secondary serving cell is required like the primary serving cell.

An object of the present invention is to provide an apparatus and method for performing uplink power control in a wireless communication system supporting carrier aggregation.

According to an aspect of the present invention, a power control method by a terminal supporting carrier aggregation based on a plurality of serving cells is provided. The method includes a first transmission power control (TPC) index for an uplink control channel (hereinafter referred to as PUCCH (PCell)) on a primary serving cell (PCell), and a secondary serving cell. : Receiving from a base station a higher layer message including a second TPC index for an uplink control channel (hereinafter, PUCCH (SCell)) on SCell), a first TPC command corresponding to the first TPC index and the first 2 receiving a second TPC command corresponding to the TPC index from the base station, controlling power of the PUCCH (PCell) based on the first TPC command, and controlling the power of the PUCCH (SCell) based on the second TPC command. ) Controlling the power of.

Since power control for the PUCCH or PUSCH configured in the secondary serving cell can be performed, the CA of LTE Rel.13 can be effectively supported.

1 is a block diagram showing a wireless communication system to which the present invention is applied.
2 is an example of applying a TPC command in a channel structure of a serving cell according to the present invention.
3 is a flowchart for performing uplink power control according to an example of the present invention.
4 is an example of a correspondence relationship between a TPC index and a group TPC command.
5 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to an example of the present invention.
6 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention.
7 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention.
8 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention.
9 is an example of a correspondence relationship between a TPC index and a group TPC command according to an embodiment.
10 is a block diagram illustrating a terminal and a base station according to an embodiment.

Hereinafter, some embodiments will be described in detail through exemplary drawings in the present specification. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present specification, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present specification, a detailed description thereof will be omitted.

In addition, this specification describes a wireless communication network, and the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (for example, a base station) that governs the wireless communication network, or The work can be done at a terminal coupled to the network.

1 is a block diagram showing a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data. The wireless communication system 10 includes at least one base station (BS). Each base station 11 provides a communication service for a specific geographic area or frequency area, and may be referred to as a site. A site may be divided into a plurality of areas 15a, 15b, and 15c, which may be referred to as sectors, and each of the sectors may have different cell IDs.

The terminal 12 (user equipment, UE) may be fixed or mobile, and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), handheld device (handheld device) can be referred to as other terms. Base station 11 generally refers to a station communicating with the terminal 12, eNodeB (evolved-NodeB), BTS (Base Transceiver System), access point (Access Point), femto base station (Femto eNodeB), in-home Base station (Home eNodeB: HeNodeB), relay (relay), remote radio head (Remote Radio Head: RRH) may be referred to as other terms. Cells (15a, 15b, 15c) should be interpreted in a comprehensive meaning indicating a partial area covered by the base station 11, and encompass all various coverage areas such as megacells, macrocells, microcells, picocells, and femtocells. to be.

Hereinafter, downlink refers to a communication or communication path from the base station 11 to the terminal 12, and uplink refers to a communication or communication path from the terminal 12 to the base station 11 . In downlink, the transmitter may be a part of the base station 11 and the receiver may be a part of the terminal 12. In the uplink, the transmitter may be a part of the terminal 12 and the receiver may be a part of the base station 11. There is no limitation on a multiple access technique applied to the wireless communication system 10. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA , OFDM-CDMA, such as various multiple access techniques can be used.

Layers of a radio interface protocol between the terminal 12 and the base station 11 may be classified into a first layer (L1), a second layer (L2), and a third layer (L3). Among them, a physical layer belonging to the first layer provides an information transfer service using a physical channel.

The physical layer is connected through a higher layer, a media access control (MAC) layer and a transport channel. Data is transmitted through a transport channel between the MAC layer and the physical layer. Transport channels are classified according to how data is transmitted through the air interface. In addition, data is transmitted through a physical channel between different physical layers (ie, between a physical layer of a terminal and a base station). The physical channel may be modulated in an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and utilizes time, frequency, and space generated by a plurality of antennas as radio resources.

For example, among the physical channels, the PDCCH (Physical Downlink Control CHannel) informs the UE of resource allocation of Paging CHannel (PCH) and DownLink Shared CHannel (DL-SCH) and Hybrid Automatic Repeat Request (HARQ) information related to DL-SCH, It may carry an uplink scheduling grant that informs the UE of resource allocation for uplink transmission. The PDSCH (Physical Uplink Shared Channel) carries a DL-SCH including downlink data. In addition, PUCCH (Physical Uplink Control CHannel) carries uplink control information such as HARQ ACK/NACK for downlink transmission, scheduling request, and CQI. In addition, the PUSCH (Physical Uplink Shared CHannel) carries the UL-SCH (UpLink Shared CHannel) including uplink data. When necessary according to the configuration and request of the base station, the PUSCH may include channel state information (CSI) information such as HARQ ACK/NACK and CQI.

Hereinafter, the term multiple carrier system includes a system supporting carrier aggregation (CA). The serving cell may be defined as a component frequency band that can be aggregated by CA based on a multiple component carrier system. The serving cell includes a primary serving cell (PCell) and a secondary serving cell (SCell). The primary serving cell is one that provides security input and non-access stratum (NAS) mobility information in the radio resource control (RRC) connection (establishment) or re-establishment state. It means serving cell. Depending on the capabilities of the terminal, at least one cell may be configured to form a set of serving cells together with a primary serving cell, and the at least one cell is referred to as a secondary serving cell. The set of serving cells configured for one terminal may consist of only one primary serving cell, or may consist of one primary serving cell and at least one secondary serving cell. Each serving cell may be operated in an activated or deactivated state.

The uplink transmission power control of the terminal is performed by the TPC command. The TPC command is a signaling that the base station transmits to the terminal to perform power control of the PUCCH or PUSCH. With the introduction of PUCCH (SCell) in LTE Rel.13, if PUCCH (SCell) is additionally configured to a UE configured with CA, some uplink control information transmitted only through the existing PUCCH (PCell) (UCI) ) Can be sent to PUCCH (SCell). In addition, UCI information may be transmitted on a PUSCH (SCell) according to the presence or absence of an uplink grant. Therefore, in order to effectively support PUCCH (SCell)-based CA, power control for PUCCH (SCell) or PUSCH is required, like the primary serving cell.

2 is an example of applying a TPC command in a channel structure of a serving cell according to the present invention.

Referring to FIG. 2, a primary serving cell (PCell) and a secondary serving cell (SCell) are configured as CAs in a terminal. A PUCCH region and a PUSCH region are classified on the frequency axis of each serving cell. The transmission power of the signal in the PUCCH region and the signal in the PUSCH region may be controlled by a group TPC command. The group TPC command is a TPC command for a terminal group. That is, the group TPC command includes a TPC command for each of a plurality of terminals. When at least one of the plurality of terminals supports PUCCH (SCell), the group TPC command may include a TPC command of a primary serving cell and a secondary serving cell for the same terminal. As signals of the PUCCH region in which power is controlled by the group TPC command, there are periodic CSI reporting, HARQ-ACK, SR, and the like.

Looking specifically at the operation to which the group TPC command for PUCCH/PUSCH transmission power control in each serving cell is applied, PUCCH (PCell) is controlled by TPC command 1, and PUCCH (SCell) is controlled by TPC command 2. (In this embodiment, the TPC command for the PUSCH is omitted for convenience).

Here, the TPC commands 1 and 2 may be included in one group TPC command or different group TPC commands. In other words, the TPC command 1 and the TPC command 2 may be provided by one DCI (downlink control information), or may be provided by different DCIs. The DCI is transmitted to the UE through the PDCCH in the common search space.

In the present embodiment, it is assumed that one primary serving cell and one secondary serving cell are configured in one terminal, and two TPC commands are assumed accordingly, but this is only an example, and a secondary serving cell configured with a PUCCH in one terminal is There may be more than one, and the number of TPC commands may increase accordingly. Hereinafter, the group TPC command is briefly described as controlling PUCCH (PCell) (hereinafter referred to as PUCCH (PCell)) and PUCCH (SCell) (hereinafter referred to as PUCCH (SCell)), but the group TPC command is the primary serving cell and the PUCCH ( SCell) as well as PUSCH can be controlled.

Hereinafter, a method of performing uplink power control by a group TPC command according to the present invention will be described in detail.

3 is a flowchart for performing uplink power control according to an example of the present invention.

Referring to FIG. 3, the base station transmits a message of an upper layer for assigning a TPC index to a terminal (S300). The TPC index determines an index to a TPC command for the terminal (TPC index determines an index to TPC command for a given UE). The TPC index may have a value of N or M, and N and M are distinguished based on the DCI format. For example, in case of DCI format 3, the TPC index has a value of N, and in case of DCI format 3A, the TPC index has a value of M. The higher layer message may be an RRC message. For example, the RRC message is TPC-PDCCH-Config and is used to specify indexes and RNTIs for power control of PUCCH and PUSCH. Power control of the PUCCH and PUSCH may be set or released using the TPC-PDCCH-Config.

In this embodiment, a plurality of TPC indexes for a terminal are assigned to a primary serving cell and a secondary serving cell of a terminal, respectively, and may correspond to respective TPC commands for the primary serving cell and the secondary serving cell. As an example, it may include a first TPC index for PUCCH (PCell) and a second TPC index for PUCCH (SCell). The second TPC index may be referred to as an additional index to the first TPC index. A message (eg, an RRC message or TPC-PDCCH-Config) of an upper layer for setting both the first TPC index and the second TPC index may have a structure as shown in the following table.

- ASN1START TPC-PDCCH-Config ::= CHOICE { release NULL, setup SEQUENCE { tpc-RNTI BIT STRING (SIZE (16)), tpc-Index [TPC-Index, TPC-Index_r13] } } TPC-Index ::= CHOICE { indexOfFormat3 INTEGER (1..15), indexOfFormat3A INTEGER (1..31) TPC-Index_r13(SCell PUCCH) ::= CHOICE { indexOfFormat3 INTEGER (1..15), indexOfFormat3A INTEGER (1..31) } - ASN1STOP

Referring to Table 1, the tpc-Index field indicates [TPC-Index, TPC-Index_r13]. Here, the TPC-Index field indicates the first TPC index and has a value of indexOfFormat3 or indexOfFormat3A according to the DCI format. indexOfFormat3 is a natural number from 1 to 15, and indexOfFormat3A is a natural number from 1 to 31. Meanwhile, the TPC-Index_r13 field indicates the second TPC index and has a value of indexOfFormat3 or indexOfFormat3A according to the DCI format. indexOfFormat3 is a natural number from 1 to 15, and indexOfFormat3A is a natural number from 1 to 31.

The terminal receiving the higher layer message uses the TPC-Index field as a TPC index for a TPC command for PUCCH (PCell) and a TPC-Index_r13 field as a TPC index for TPC command for PUCCH (SCell). do. That is, the terminal can distinguish between a TPC index for a primary serving cell and a TPC index for a secondary serving cell. The first TPC index and the second TPC index may be independently or individually set by the base station, or may be associated with each other or set identically. The UE can perform power control for PUCCH (PCell) and PUCCH (SCell) transmission using two TPC indexes. The TPC-Index_r13 field may be replaced with a name including a term related to a secondary serving cell such as TPC-Index_SCell. Here, the PUCCH for the primary serving cell and the PUCCH for the secondary serving cell may belong to one terminal.

When the base station provides a plurality of TPC indexes set as in step S300 to the terminal, the terminal completes TPC configuration for the primary serving cell and the secondary serving cell.

Thereafter, the base station transmits a group TPC command to the terminal (S305). The group TPC command is included in DCI and transmitted. The length and contents of the group TPC command may differ depending on which DCI format is used for transmission of the group TPC command. In case of DCI format 3, it is the same as "TPC command number 1, TPC command number 2,..., TPC command number N", and in case of DCI format 3A, "TPC command number 1, TPC command number 2,..., TPC command" Same as number M". N and M are the parameters described in Table 1. In the present invention, both DCI formats 3 and 3A may be used to transmit the group TPC command, and DCI of other formats may also be used.

In order for the UE or the base station to perform both power control for PUCCH (PCell) and power control for PUCCH (SCell), a group TPC command of various embodiments may be used in step S305.

As an example, the group TPC command is a single group TPC command, and one DCI contains a single group TPC command. The DCI including the single group TPC command is mapped to the PDCCH scrambled by the TPC-PUCCH RNTI and transmitted. Further, the DCI including the single group TPC command is transmitted on the primary serving cell (see FIG. 5).

As an example, an example of the correspondence between the TPC index and the group TPC command is shown in FIG. 4. Referring to FIG. 4, both DCI format 3 and DCI format 3A have a specific length, and in FIG. 4, they are exemplarily referred to as 11 bits.

In the example of DCI format 3, UE1, UE2, and UE3 perform PUCCH power control by one group TPC command. Among UE1 to UE3, only UE1 is configured with a PUCCH (SCell), so an additional TPC command (2 bits) for power control of the PUCCH (SCell) is allocated to UE1. The remaining UE2 and UE3 have no PUCCH (SCell) configured. In DCI format 3, every two bits are one TPC command, and each TPC command sequentially corresponds to a specific TPC index. Bits 1 and 2 (or TPC command 1) correspond to TPC index 1, bits 3 and 4 (or TPC command 2) correspond to TPC index 2, and bits 5 and 6 (or TPC command 3) It corresponds to the TPC index 3, and the 7th and 8th bits (or TPC command 4) correspond to the TPC index 4. In addition, which UE or which serving cell each of the TPC indexes relates to is preset by signaling as shown in Table 1. For example, TPC index 1 relates to a PUCCH (PCell) of UE1, and TPC index 4 relates to a PUCCH (SCell) of UE1. This is because only UE1 is configured with a PUCCH (SCell), and an additional TPC command (2 bits) for power control of the PUCCH (SCell) is allocated to UE1.

Next, in the example of DCI format 3A, UE1 to UE6 perform PUCCH/PUSCH power control by one group TPC command. Among UE1 to UE6, since PUCCH (SCell) is configured in UE1 and UE6, an additional TPC command (1 bit) for power control of PUCCH (SCell) is allocated to UE1 and UE6, respectively. In DCI format 3A, every 1 bit is one TPC command, and each TPC command sequentially corresponds to a specific TPC index. 1st bit (or TPC command 1), 2nd bit (or TPC command 2), 3rd bit (or TPC command 3), 4th bit (or TPC command 4),..., Mth bit (or TPC Instruction M) corresponds to TPC index 1, TPC index 2, TPC index 3, TPC index 4,..., TPC index M, respectively. In addition, which UE or which serving cell each of the TPC indexes relates to is preset by signaling as shown in Table 1. For example, TPC index 1 relates to a PUCCH (PCell) of UE1, and TPC index 3 relates to a PUCCH (SCell) of UE1. In addition, the TPC index 7 relates to the PUCCH (PCell) of UE6, and the TPC index 8 relates to the PUCCH (SCell) of UE6.

Referring back to FIG. 3, as another example, the group TPC command is a multi-group TPC command, and a first group TPC command (power control for PUCCH (PCell)) and a second group TPC command (power for PUCCH (SCell)) Controls) are included in different DCIs. The first DCI including the first group TPC command and the second DCI including the second group TPC command are both transmitted on the primary serving cell (see FIGS. 6 and 7 ).

As another example, the group TPC command is a multi-group TPC command, and the first group TPC command (power control for PUCCH (PCell)) and the second group TPC command (power control for PUCCH (SCell)) are different DCI Included in The first DCI including the first group TPC command is transmitted on the primary serving cell, and the second DCI including the second group TPC command is transmitted on the secondary serving cell (see FIG. 8).

The terminal receives the DCI including the group TPC command, and performs power control of the PUCCH and PUSCH in the primary serving cell and the secondary serving cell based on the group TPC command (S310). Specifically, power control according to the group TPC command according to the present invention may be performed based on an accumulative power control mode. For example, when the terminal receives a group TPC command for a secondary serving cell in which a PUCCH is configured, the terminal calculates the power control value of the PUCCH according to the group TPC command by accumulating the previous value.

For example, the terminal may perform the cumulative operation based on the following equation.

는 DCI 포맷 3/3A를 통해서 단말에게 지시된 그룹 TPC명령에 해당하는 값으로 dB단위를 사용하고 아래 표 2 및 표 3을 통해서 그 값이 지시될 수 있다.

Is a value corresponding to the group TPC command instructed to the terminal through DCI format 3/3A, using a dB unit, and the value may be indicated through Tables 2 and 3 below.

TPC command field in DCI format 3A

[dB}

[dB} 0 -One

TPC command field in DCI format 1A/1B/1D/1/2A/2B/2C/2D/2/3

[dB}

[dB} 0 -One One 0 2 One 3 3

값과의 매핑관계를 나타내고, 표 3은 DCI 포맷 3A인 경우에 그룹 TPC 명령과

값과의 매핑관계를 나타낸다. Referring to Table 2 and Table 3, Table 2 shows the group TPC command and the DCI format 1A/1B/1D/1/2A/2B/2C/2D/2/3.

The mapping relationship with the value is shown, and Table 3 shows the group TPC command and the DCI format 3A.

Represents the mapping relationship with values.

Again in Equation 1, g(i) represents the current PUCCH power control adjustment state. In FDD, M=1, and in TDD, M is the number of downlink subframes associated with one PUCCH transmission, and the value may vary according to downlink HARQ timing. k _m is a value corresponding to the downlink HARQ timing and indicates each of the associated downlink subframes. If the current subframe is n, it means nk _m downlink subframe. The k _m values are indicated for example in Table 4 below.

UL/DL
Settings Subframe n 0 One 2 3 4 5 6 7 8 9 0 - - 6 - 4 - - 6 - 4 One - - 7, 6 4 - - - 7, 6 4 - 2 - - 8, 7, 4, 6 - - - - 8, 7, 4, 6 - - 3 - - 7, 6, 11 6, 5 5, 4 - - - - - 4 - - 12, 8, 7, 11 6, 5, 4, 7 - - - - - - 5 - - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - - 6 - - 7 7 5 - - 7 7 -

The UE transmits the PUCCH and/or PUSCH to the base station on the primary serving cell and/or the secondary serving cell based on the power controlled in step S310 (S315).

Hereinafter, various embodiments of the transmission of the group TPC command posted in step S305 will be described in more detail with reference to the drawings.

5 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to an example of the present invention.

Referring to FIG. 5, a first TPC command for PUCCH (PCell) and a second TPC command for PUCCH (SCell) are included in a single group TPC command and are mapped to one DCI. That is, in this embodiment, one DCI is shared for power control of two PUCCHs (PCells) and PUCCHs (SCells). DCI including such a single group TPC command may be, for example, as shown in FIG. 4.

The DCI including the single group TPC command according to the present embodiment is mapped to the PDCCH scrambled by TPC-PUCCH#0 (RNTI) and transmitted. In addition, a PDCCH (PDCCH with TPC-PUCCH RNTI) related to the single group TPC command is mapped to a common search space (CSS) on the primary serving cell. From the viewpoint of the operation of the base station and the terminal, the base station first generates one DCI for power control of two PUCCHs (PCells) and PUCCHs (SCells), and converts the PDCCH including the generated DCIs to TPC-PUCCH RNTI. Scrambled (to be precise, scrambled on the CRC bit), and the scrambled PDCCH is mapped to the CSS of the primary serving cell and transmitted to the terminal. In addition, the UE monitors the CSS of the primary serving cell in order to receive the TPC command on the PUCCH (SCell). In this respect, the present embodiment is different from that of a terminal in which two dual-connectivity is configured to monitor two CSS (CSS on PCell and PSCell).

Other examples of PDCCH mapped to the common search space are PDCCH (PDCCH with RA-RNTI) scrambled with RA-RNTI (Random Access-Radio Network Temporary Identifier), and PDCCH scrambled with C-RNTI (common-RNTI). C-RNTI), PDCCH scrambled with Temporary C-RNTI (PDCCH with TC-RNTI), PDCCH scrambled with TPC-PUSCH-RNTI (PDCCH with TPC-PUSCH-RNTI), and PDCCH scrambled with eIMTA-RNTI (PDCCH with eIMTA-RNTI), PDCCH scrambled with SPS-RNTI (PDCCH with SPS-RNTI), PDCCH scrambled with P-RNTI (PDCCH with P-RNTI), PDCCH scrambled with SI-RNTI (PDCCH with SI- RNTI).

6 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention.

Referring to FIG. 6, a first group TPC command for PUCCH (PCell) and a second group TPC command for PUCCH (SCell) are included in different DCIs. In addition, the first DCI including the first group TPC command and the second DCI including the second group TPC command are both transmitted on the primary serving cell. The first DCI is mapped to PDCCH1 scrambled with TPC-PUCCH#0 RNTI, and the second DCI is mapped to PDCCH2 scrambled with TPC-PUCCH#0 RNTI and transmitted. That is, one TPC-PUCCH RNTI value is commonly applied to two PDCCHs having different TPC commands (or DCIs). Also, both PDCCH1 and PDCCH2 are mapped to CSS on the primary serving cell. Since PDCCH1 and PDCCH2 are mapped to the same CSS and the same TPC-PUCCH RNTI value is applied, information for distinguishing between PDCCH1 and PDCCH2 is required.

As an example, a carrier indicator field (CIF) may be used to distinguish between PDCCH1 and PDCCH2. For example, CIF may be included in the second DCI related to PUCCH (SCell). In other words, the CIF can be used to distinguish between the first DCI and the second DCI. In other words, the CIF may be used to distinguish between the first group TPC command and the second group TPC command. According to this, the base station can configure cross-carrier scheduling through RRC signaling to terminals in which PUCCH (SCell) is configured in the common search space, similar to cross carrier scheduling that can be configured in the terminal-specific search space. However, in this case, the CIF value activated in the DCI serves as an indicator indicating only the DCI for the PUCCH (SCell), not indicating the serving cell through which the PDSCH or PUSCH is transmitted, as in the UE-specific search space. Therefore, only 1 bit can be used as the CIF value. Of course, when the number of secondary serving cells in which the PUCCH (SCell) is configured is two or more, the bit value for the CIF value may increase accordingly. For example, if the CIF value of 1 bit is 0, the UE recognizes that the corresponding DCI provides a group TPC command for PUCCH (SCell). On the other hand, when the CIF value of 1 bit is 1, it is reserved. Accordingly, cross-carrier scheduling in the common search space is set through RRC signaling, and is indicated (or activated) as a 3-bit CIF field or 1-bit CIF field in DCI based on the RRC signaling configuration. All fields not used in the CIF field are reserved. In addition, the UE must monitor the CSS of the primary serving cell in order to receive a group TPC command for PUCCH (SCell). The following is an RRC signaling information element for cross-carrier scheduling. Here, in order to indicate cross-carrier scheduling on the primary serving cell, the schedulingCellId value must be the serving cell index of the primary serving cell (ie, 0). And cif-presence is activated, and only 3 bits or 1 bit is activated in DCI (format 3/3A).

- ASN1START CrossCarrierSchedulingConfig-r10 ::= SEQUENCE { schedulingCellInfo-r10 CHOICE { own-r10 SEQUENCE {- No cross carrier scheduling cif-Presence-r10 BOOLEAN }, other-r10 SEQUENCE {- Cross carrier scheduling schedulingCellId-r10 ServCellIndex-r10, pdsch-Start-r10 INTEGER (1..4) } } } - ASN1STOP

From the viewpoint of the operation of the base station and the terminal, the base station first generates a first DCI for power control of a PUCCH (PCell) and a second DCI for power control of a PUCCH (SCell). At this time, the base station includes the CIF indicating the primary serving cell in the second DCI. The base station scrambles PDCCH1 including the first DCI with TPC-PUCCH RNTI, and scrambles PDCCH2 including the second DCI with TPC-PUCCH RNTI. In addition, the base station maps both the scrambled PDCCH1 and PDCCH2 to the CSS of the primary serving cell and transmits it to the terminal. In addition, the UE monitors the CSS of the primary serving cell in order to receive the TPC command on the PUCCH (SCell).

According to this embodiment, cross-carrier scheduling is not only possible for PDCCHs mapped on a UE-specific search space (USS), but also PDCCHs mapped on CSS. In addition, by using the CIF, there is no need to introduce a separate RNTI for distinguishing PDCCH1 and PDCCH2.

7 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention. This is different from that of FIG. 6 in that a new RNTI is used for PDCCH2 transmitted on the CSS of the primary serving cell.

Referring to FIG. 7, a first group TPC command for PUCCH (PCell) and a second group TPC command for PUCCH (SCell) are included in different DCIs. In addition, the first DCI including the first group TPC command and the second DCI including the second group TPC command are both transmitted on the primary serving cell. The first DCI is mapped to PDCCH1 scrambled with TPC-PUCCH#0 RNTI, and the second DCI is mapped to PDCCH2 scrambled with TPC-PUCCH-SCell RNTI and transmitted. That is, different RNTI values are applied to two PDCCHs having different TPC commands (or DCIs). It goes without saying that the TPC_PUCCH-SCell RNTI newly defined in this embodiment for power control of the PUCCH (SCell) can be replaced with another term performing the same function.

Meanwhile, both PDCCH1 and PDCCH2 are mapped to CSS on the primary serving cell. Although PDCCH1 and PDCCH2 are mapped to the same CSS, since different RNTI values are applied to the scramble of the PDCCH, separate information for distinguishing between PDCCH1 and PDCCH2 is not required. That is, since different RNTI values and different TPC index values are respectively set and transmitted on the PDCCH, it is not necessary to set a separate CIF value.

From the viewpoint of the operation of the base station and the terminal, the base station first generates a first DCI for power control of a PUCCH (PCell) and a second DCI for power control of a PUCCH (SCell). The base station scrambles PDCCH1 including the first DCI with TPC-PUCCH RNTI, and scrambles PDCCH2 including the second DCI with TPC-PUCCH-SCell RNTI. In addition, the base station maps both the scrambled PDCCH1 and PDCCH2 to the CSS of the primary serving cell and transmits it to the terminal. In addition, the UE monitors the CSS of the primary serving cell by using the TPC-PUCCH-SCell RNTI in order to receive the TPC command on the PUCCH (SCell).

8 is a diagram illustrating a method of transmitting and monitoring a group TPC command according to another example of the present invention.

Referring to FIG. 8, a first group TPC command for PUCCH (PCell) and a second group TPC command for PUCCH (SCell) are included in different DCIs. Further, the first DCI including the first group TPC command is transmitted on the primary serving cell, and the second DCI including the second group TPC command is transmitted on the secondary serving cell.

The first DCI is mapped to PDCCH1 scrambled with TPC-PUCCH RNTI, and PDCCH1 is mapped to CSS on the primary serving cell. The second DCI is mapped to PDCCH2 scrambled with TPC-PUCCH RNTI, and PDCCH2 is mapped to CSS on the secondary serving cell.

In order for the UE to receive PDCCH2, it must first know that PDCCH2 is mapped to CSS on the secondary serving cell. When the PDCCH2 is mapped to the CSS on the secondary serving cell, the base station and the terminal may implicitly promise, or the base station may explicitly inform the terminal.

As an example, the UE may transmit capability information indicating that it is capable of supporting MBMS (Multimedia Broadcast Multicast Service), and the base station receiving the performance information may map PDCCH2 to the CSS on the secondary serving cell. have. That is, the performance information may be information implicitly notifying the base station to transmit the PDCCH2 by mapping it to the CSS on the secondary serving cell. In addition, the terminal transmitting the performance information may implicitly know that it must monitor the CSS on the secondary serving cell in order to receive a group TPC command for the PUCCH (SCell) in the future.

The reasons for this operation are as follows. The PMCH (Phsycal MBMS Channel), which is a physical channel related to MBMS, is transmitted on a carrier (or secondary serving cell) other than the primary serving cell, and the PDCCH (PDCCH with M-RNTI) required for decoding the PMCH is not a primary serving cell. The PMCH is mapped to the CSS of the carrier (or secondary serving cell) transmitted. Therefore, in order for a UE capable of supporting MBMS to receive MBMS, it is necessary to monitor CSS on a secondary serving cell through which the PMCH is transmitted, not the primary serving cell. Since the UE needs to monitor the CSS of the secondary serving cell in order to receive the MBMS, it is possible to monitor PDCCH2 related to the group TPC command for the PUCCH (SCell) together in the CSS on the secondary serving cell. Here, the secondary serving cell is composed of an uplink component carrier (UL CC) for transmitting PUCCH (SCell) and a downlink component carrier (DL CC) connected to the UL CC and SIB-2. Accordingly, the UE monitors the PDCCH scrambled with TPC-PUCCH RNTI in the CSS on the DL CC.

In order for the UE to monitor the CSS on the secondary serving cell in order to receive PDCCH2 according to this embodiment, i) transmit performance information indicating that the UE can support MBMS to the base station, ii) configure a PUCCH (SCell) to the UE I need to be. In other words, if the UE is capable of supporting MBMS and capable of supporting PUCCH (SCell), the UE may monitor the CSS on the secondary serving cell to receive a group TPC command (or DCI). In another aspect, when a UE having UE capability corresponding to mbms-SCell supports PUCCH (SCell), and it is set by the base station, the UE is a group TPC command for power control of PUCCH (SCell) In order to receive a PUCCH (SCell), a UL CC (SCell) and a CSS on a DL CC (SCell) associated with the SIB-2 link are monitored.

Performance information (mbms-SCell-r11) indicating that MBMS is supported may be defined as shown in Table 6 below. It may be included in parameter information related to MBMS (MBMS-Parameters-r11).

MBMS-Parameters-r11 ::= SEQUENCE { mbms-SCell-r11 ENUMERATED {supported} OPTIONAL, mbms-NonServingCell-r11 ENUMERATED {supported} OPTIONAL }

Referring to Table 6, parameter information related to MBMS (MBMS-Parameters-r11) may be information included in the UE-EUTRA-Capability IE. mbms-SCell-r11 is performance information indicating that MBMS can be supported in a secondary serving cell, and can be selectively included in parameter information related to MBMS. When mbms-SCell-r11 indicates {supported} This indicates that the UE can support the reception of MBMS in the secondary serving cell.

If the performance information indicating that the MBMS can be supported is displayed as "supported", the UE expects to monitor the CSS on the secondary serving cell in order to receive a group TPC command for PUCCH (SCell) in the future. This is because the terminal can already monitor CSS on a secondary serving cell or a non-serving cell.

As another example, regardless of whether the UE supports MBMS or not, if the UE supports PUCCH (SCell) (or if PUCCH (SCell) is configured), the UE implicitly uses the CSS on the secondary serving cell to receive PDCCH2. Can be monitored. In this case, the base station also implicitly maps the PDCCH2 to the CSS on the secondary serving cell and transmits it to the terminal.

9 is an example of a correspondence relationship between a TPC index and a group TPC command according to an embodiment.

Referring to FIG. 9, the base station may set a TPC index value set by higher layer signaling as a value common to each terminal. In other words, unlike in FIG. 4, the TPC index value can be shared without setting differently to each terminal. This method is a method that is valid only for new UEs for which PUCCH (SCell) is configured, and is indicated in a DCI format such as a legacy UE (Fig. 5) or a case where a PUCCH (SCell) is dedicated and indicated through another DCI (Fig. 6, 7 or 8) can all be applied. The specific method is as follows.

The legacy UE 2/4/5 is configured as in the prior art, and the new UEs UE 1/7/8 and UE6/10/11/12 are each set to the same TPC index value. In addition, the base station may provide a power value between the terminals (e.g. UE1/7/8 or UE6/10/11/12) by distinguishing by time. The equation for classifying time is as follows.

Referring to Equation 2, the K value is the number of terminals sharing one TPC index. In this example, it may be K=3 or K=4. For example, in UE 1/7/8 with K=3, the base station sets i=0 to UE1, i=1 to UE7, and i=2 to UE8, so that 3 terminals per subframe. Different TPC index values can be provided to each. Through subframes corresponding to each value of i, each terminal can share and use a bit value in the same TPC field. According to this, a group TPC command value can be provided by more efficiently utilizing the TPC index value.

10 is a block diagram illustrating a terminal and a base station according to an embodiment.

Referring to FIG. 10, a terminal 1000 includes a processor 1010, a radio frequency (RF) unit 1020, and a memory 1025. The memory 1025 is connected to the processor 1010 and stores various information for driving the processor 1010. The RF unit 1020 is connected to the processor 1010 and transmits and/or receives a radio signal.

The RF unit 1020 receives a message of an upper layer assigning a TPC index from the base station 1050. The definition and function of the TPC index are as described in step S300. The higher layer message may be an RRC message. For example, the RRC message is TPC-PDCCH-Config, as shown in Table 1, and is used to specify indexes and RNTIs for power control of PUCCH and PUSCH. Power control of the PUCCH and PUSCH may be set or released using the TPC-PDCCH-Config. The first TPC index and the second TPC index may be independently or individually set by the processor 1060 of the base station 1050, may be related to each other, or may be set identically.

The processor 1010 implements the functions, processes and/or methods of the terminal proposed in FIGS. 2 to 8 of the present specification.

Specifically, when the RF unit 1020 receives the higher layer message, the processor 1010 completes the TPC setting for the primary serving cell and the secondary serving cell. Further, the processor 1010 uses a TPC-Index field as a TPC index for a TPC instruction for PUCCH (PCell), and a TPC-Index_r13 field as a TPC index for a TPC instruction for PUCCH (SCell). That is, the processor 1010 may distinguish a TPC index for a primary serving cell and a TPC index for a secondary serving cell. The processor 1010 may perform power control for PUCCH (PCell) and PUCCH (SCell) transmission using two TPC indexes.

Also, the RF unit 1020 receives a group TPC command from the base station 1050. The group TPC command is included in the DCI and received. The definition, function, and structure of the group TPC command are as described in step S305. In order for the processor 1010 to perform both power control for PUCCH (PCell) and power control for PUCCH (SCell), in step S305, a group TPC command of various embodiments may be used. As for the transmission method of the group TPC command, the embodiments of FIGS. 5 to 8 may be used.

As an example, the processor 1010 monitors the CSS of the primary serving cell in order to receive a TPC command from the PUCCH (SCell).

As another example, the processor 1010 monitors the CSS of the primary serving cell by using the TPC-PUCCH-SCell RNTI in order to receive a TPC command to the PUCCH (SCell).

As another example, the processor 1010 may generate performance information indicating that MBMS is supported and send it to the RF unit 1020, and the RF unit 1020 may transmit a message as shown in Table 2 to the base station 1050. . In addition, the processor 1010 monitors the CSS of the secondary serving cell for reception of the MBMS, but also monitors PDCCH2 for the group TPC command for the PUCCH (SCell) in the CSS on the secondary serving cell.

As another example, the processor 1010 implicitly sets PDCCH2 when the terminal 1000 supports PUCCH (SCell) (or when PUCCH (SCell) is configured), regardless of whether the terminal 1000 supports MBMS. To receive, it is possible to monitor the CSS on the secondary serving cell.

When receiving the group TPC command by monitoring, the processor 1010 performs power control of the PUCCH and PUSCH in the primary serving cell and the sub-serving cell based on the group TPC command. Specifically, the processor 1010 may perform power control on the PUCCH of the secondary serving cell based on an accumulative power control mode. For example, when a group TPC command for a secondary serving cell in which a PUCCH is configured is received, the processor 1010 accumulates and calculates the power control value of the PUCCH according to the group TPC command to the previous value.

The RF unit 1065 transmits a PUCCH (PCell) and/or a PUCCH (SCell) to the base station 1050 according to the power controlled by the group TPC command from the terminal 1000.

The base station 1050 includes a memory 1055, a processor 1060, and a radio frequency (RF) unit 1065. The memory 1055 is connected to the processor 1060 and stores various pieces of information for driving the processor 1060. The RF unit 1065 is connected to the processor 1060 and transmits and/or receives a radio signal. Specifically, the RF unit 1065 transmits a message of an upper layer to which a TPC index is assigned to the terminal 1000. In addition, the RF unit 1065 transmits the group TPC command to the terminal 1000 on the primary serving cell and/or the secondary serving cell. In addition, the RF unit 1065 receives performance information related to MBMS as shown in Table 2 from the terminal 1000. In addition, the RF unit 1065 receives a PUCCH (PCell) and/or a PUCCH (SCell) from the terminal 1000.

The processor 1060 implements functions, processes, and/or methods related to the base station of FIGS. 2 to 8 of the present specification.

As an example, the processor 1060 generates one DCI for power control of two PUCCH (PCell) and PUCCH (SCell), and scrambles the PDCCH including the generated DCI with TPC-PUCCH RNTI, and scrambles The PDCCH is mapped to the CSS of the primary serving cell.

As another example, the processor 1060 generates a first DCI for power control of a PUCCH (PCell) and a second DCI for power control of a PUCCH (SCell). In this case, the processor 1060 includes a CIF indicating a primary serving cell in the second DCI. The processor 1060 scrambles PDCCH1 including the first DCI with TPC-PUCCH RNTI, and scrambles PDCCH2 including the second DCI with TPC-PUCCH RNTI. And the processor 1060 maps both the scrambled PDCCH1 and PDCCH2 to the CSS of the primary serving cell.

As another example, the processor 1060 generates a first DCI for power control of a PUCCH (PCell) and a second DCI for power control of a PUCCH (SCell). The processor 1060 scrambles PDCCH1 including the first DCI with TPC-PUCCH RNTI and scrambles PDCCH2 including the second DCI with TPC-PUCCH-SCell RNTI. And the processor 1060 maps both the scrambled PDCCH1 and PDCCH2 to the CSS of the primary serving cell.

As another example, the processor 1060 maps PDCCH1 scrambled with TPC-PUCCH RNTI to CSS on the primary serving cell, and maps PDCCH2 scrambled with TPC-PUCCH RNTI to CSS on the secondary serving cell. This is a case where the RF unit 1060 receives performance information indicating that MBMS can be supported from the terminal 1000.

The above-described processor may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and/or a data processing device. The memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and/or other storage device. The RF unit may include a baseband circuit for processing a radio signal. When the present embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) that performs the above-described functions. The modules are stored in memory and can be executed by the processor. The memory may be inside or outside the processor, and may be connected to the processor by various well-known means.

Claims (20)

As a method,
A first transmission power control (TPC) index for a first physical uplink control channel (PUCCH) or a first physical uplink shared channel (PUSCH) on a first uplink carrier, and on a second uplink carrier. Receiving a higher layer message including a second TPC index for a second PUCCH or a second PUSCH from the base station;
Receiving downlink control information (DCI) from the base station, wherein the DCI includes a first TPC command corresponding to the first TPC index and a second TPC command corresponding to the second TPC index; And
Controlling the transmission power of the first PUCCH or the first PUSCH based on the first TPC command, and controlling the transmission power of the second PUCCH or the second PUSCH based on the second TPC command
How to include. The method of claim 1,
Receiving downlink control information (DCI) from the base station,
Receiving the DCI in a common search space on a primary serving cell
Containing, method. The method of claim 1,
The DCI includes a third TPC command for controlling transmission power of an uplink channel of another UE. The method of claim 1,
The DCI is scrambled with a TPC-PUSCH radio network temporary identifier (RNTI). The method of claim 4,
The upper layer message further comprises the TPC-PUSCH RNTI. The method of claim 1,
The first TPC index is different from the second TPC index. The method according to any one of claims 1 to 6,
The higher layer message is a radio resource control (RRC) message. The method according to any one of claims 1 to 6,
The first uplink carrier is a primary carrier (primary carrier), the second uplink carrier is a subcarrier (secondary cariier), the method. As a method,
A first transmission power control (TPC) index for a first physical uplink control channel (PUCCH) or a first physical uplink shared channel (PUSCH) on a first uplink carrier, and on a second uplink carrier. Transmitting an upper layer message including a second TPC index for a second PUCCH or a second PUSCH to a user equipment (UE);
Configuring a first transmission power control (TPC) command and a second TPC command for the UE-wherein the first TPC command is associated with the transmission power of the first PUCCH or the first PUSCH and the second TPC command Is associated with the transmission power of the second PUCCH or the second PUSCH; And
Transmitting downlink control information (DCI) to the UE, wherein the DCI includes a first TPC command corresponding to the first TPC index and a second TPC command corresponding to the second TPC index-
How to include. The method of claim 9,
The step of transmitting downlink control information (DCI) to the UE,
Transmitting the DCI in a common search space on a primary serving cell
Containing, method. The method of claim 9,
The DCI includes a third TPC command for controlling transmission power of an uplink channel of another UE. The method of claim 9,
The DCI is scrambled with a TPC-PUSCH radio network temporary identifier (RNTI). The method of claim 12,
The upper layer message further comprises the TPC-PUSCH RNTI. The method of claim 9,
The first TPC index is different from the second TPC index. The method according to any one of claims 9 to 14,
The higher layer message is a radio resource control (RRC) message. The method according to any one of claims 9 to 14,
The first uplink carrier is a primary carrier (primary carrier), the second uplink carrier is a subcarrier (secondary cariier), the method. A device comprising means for carrying out the method according to claim 1. A device comprising means for carrying out a method according to claim 9. A computer program stored in a computer-readable storage medium comprising instructions for performing a method according to any one of claims 1 to 6. A computer program stored in a computer-readable storage medium comprising instructions for performing a method according to any one of claims 9 to 14.

Images