WO2011142602A2

WO2011142602A2 - Method for transmitting a sounding reference signal in a wireless communication system, and apparatus for same

Info

Publication number: WO2011142602A2
Application number: PCT/KR2011/003505
Authority: WO
Inventors: 김학성; 서한별; 김병훈
Original assignee: 엘지전자 주식회사
Priority date: 2010-05-12
Filing date: 2011-05-12
Publication date: 2011-11-17
Also published as: WO2011142602A3; KR20130118726A

Abstract

The present invention relates to a method and apparatus for receiving a downlink signal in a wireless communication system. More particularly, the present invention relates to a method for receiving a downlink signal, comprising: a step of receiving a downlink control channel signal having a carrier indication field (CIF) and resource allocation information; and a step of receiving, in a subframe, a downlink shared channel signal from one or more resource blocks indicated by the resource allocation information. The starting point, in the subframe, of an orthogonal frequency division multiplexing (OFDM) symbol, in which the downlink shared channel signal is present, is indicated by the bit information of the CIF.

Description

【Specification】

[Name of invention]

Method and apparatus for receiving downlink signal

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method for receiving a downlink signal and an apparatus therefor.

Background Art

Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data. In general, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, TDMACtime division multiple access (TDMA) systems, orthogonal frequency division multiple access (0FDMA) systems, ^and single carrier frequency division multiple (SC ^to FDMA) systems. access system, MC-FDMA (mult i carrier frequency division multiple access) system.

[Detailed Description of the Invention]

[Technical problem]

An object of the present invention is to provide a method and an apparatus therefor for efficiently utilizing downlink resources in a wireless communication system.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

Technical Solution

In one aspect of the present invention, a method for receiving a downlink signal in a wireless communication system, the downlink having a carrier indication field (CIF) and resource allocation information Receiving a control channel signal; And receiving a downlink shared channel signal from at least one resource block indicated by the resource allocation information in a subframe, wherein the downlink shared channel signal is present in the subframe. Mult iplexing) The starting position of the symbol is provided, indicated using the bit information of the CIF.

In another aspect of the present invention, a communication apparatus configured to receive a downlink signal in a wireless communication system, comprising: a radio frequency (RF) unit; And a microprocessor, wherein the microprocessor receives a downlink control channel signal having a carrier indicat ion field (CIF) and resource allocation information and from one or more resource blocks indicated by the resource allocation information in a subframe. Configured to receive a downlink shared channel signal, wherein a start position of a 0rthogonal frequency division multiplexing (0FDM) symbol in which the downlink shared channel signal is present in the subframe is indicated using bit information of the CIF An apparatus is provided.

Preferably, some of the bit information of the CIF indicates a carrier in which the downlink shared channel signal exists, and the remaining of the bit information of the CIF indicates a start position of an OFDM symbol in which the downlink shared channel signal exists. .

Preferably, some of the bit information of the CIF indicates a resource usage state in the second slot of the subframe, and the remaining of the bit information of the CIF indicates the start position of an OFDM symbol in which the downlink shared channel signal is present. Instruct.

Preferably, the bit information of the CIF indicates a difference between a start position of an OFDM symbol in which a downlink control channel signal exists and a start position of an OFDM symbol in which the downlink shared channel signal exists in the subframe.

Preferably, the start position of the 0FDM symbol in which the downlink shared channel signal is present is indicated using bit information of the CIF and a control format indicator (CFI) value.

Preferably, the CFI value is received using an RRCXRadio Resource Control) signal. Preferably, the downlink control channel signal is R-PDCCH (Relay Physical)

The downlink control channel signal is a downlink shared channel signal, and the R-PDSCH (Relay Physical Downlink Shared Channel) signal.

Advantageous Effects

According to an embodiment of the present invention, downlink resources can be efficiently used in a wireless communication system.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

[Brief Description of Drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide examples of the present invention and together with the description, describe the technical idea of the present invention.

1 illustrates a structure of a radio frame of a 3GPP system.

2 illustrates a resource grid for a downlink slot.

3 illustrates a structure of a downlink subframe.

4 illustrates a structure of an uplink subframe used in a system.

5 illustrates a wireless communication system including a relay.

FIG. 6 illustrates backhaul communication using an MBSFN (Mu 11 i -Med i a Broadcast over a Single Frequency Network) subframe.

7 illustrates a carrier aggregation (CA) communication system.

8 shows an example of indicating a carrier using a CIF field.

9 shows an example of informing the control region size of each carrier.

10 to 14 illustrate a method of notifying a starting point of a (R-) PDSCH (or R-PDCCH) in a backhaul subframe according to an embodiment of the present invention.

15 illustrates a base station, a relay, and a terminal applicable to the present invention.

[Form for conducting invention] The construction, operation, and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. Embodiments of the present invention may be used in various radio access 85 technologies such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, MC-FDMA. CDMA may be implemented with a radio technology such as UTRAOJniversal Terrestrial Radio Access (CDMA2000) or CDMA2000. TDMA may be implemented in a wireless technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). 0FDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), and the like. UTRA is part of the UMTSCUniversal Mobile Teleco unications System. 3rd Generation Partnership Project (3GPP) long terra evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA. LTE-A (Advanced) is an evolution of 3GPP LTE.

The following embodiments are mainly described in the case where the technical features of the present invention is applied to the 3GPP system 95, but this is by way of example and the present invention is not limited thereto.

1 illustrates a structure of a radio frame used in a 3GPP system.

Referring to FIG. 1, a radio frame has a length of 10 ms (30720OT _s ) and is composed of 10 equally sized subframes. Each subframe has a length of 1 ms and consists of two slots. Each

The 100 slot has a length of 0.5ms (1536OT _s ). ^ Represents the sampling time,

T _s = l / (15kHzx2048) = 3.2552xl0 ^_8 (about 33ns). Slots in the time domain

0FDM or SC-FDMA symbol, and includes a plurality of resource blocks (RBs) in the frequency domain. In an LTE system, one resource block includes 12 subcarriers ^χ 7 (6) 0FDM or SC-FDMA symbols. Data is sent

A transmission time interval (ΤΠ), which is 105 units of time, may be determined by one or more subframes. The structure of the above-described radio frame is only an example, and the number of subframes or subslots and the number of 0FDM / SC-FDMA symbols in the radio frame are It can be changed in various ways.

2 illustrates a resource grid for a downlink slot.

When 110 to FIG. 2 _yae downlink slot includes a plurality (e.g., seven) N RB ^DL of resource blocks included in the OFDM symbols and the frequency domain in the time domain. Since each resource block includes 12 subcarriers, the downlink slot includes N ^DL RBX12 subcarriers in the frequency domain. FIG. 2 illustrates that the downlink pilot includes 7 OFDM symbols and the resource block includes 12 subcarriers, but is not limited thereto. For example, the number of OFDM symbols included in the downlink slot may be modified according to the length of the cyclic prefix (CP). Each element on the resource grid is called a resource element (RE). The RE is a minimum time / frequency resource defined in a physical channel, indicated by one OFDM symbol index and one subcarrier index. One resource block is composed of xw REs. w _b is the number of OFDM symbols included in the downlink 120 slot and N _s is the number of subcarriers included in the resource block. The number Nb of a resource block included in a downlink slot depends on a downlink transmission bandwidth set in a cell.

The downlink slot structure illustrated in FIG. 2 is equally applied to the uplink slot structure. However, the uplink slot structure includes an SC-FDMA symbol instead of an OFDM symbol. 125 FIG. 3 illustrates a structure of a downlink subframe used in a 3GPP system.

Referring to FIG. 3, at least one OFDM symbol is used as a control region from the beginning of a subframe and the remaining OFDM symbols are used as a data region. The size of the control region may be set independently for each subframe. The control region is used to transmit scheduling information and other Ll / L2 (layer 1 / layer 2) control information. The data area is used to carry 130 traffic. The control channel includes a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-automatic Repeat Request (ARQ) Indicator CHannel (PHICH), and a Physical Downlink Control CHannel (PDCCH). The traffic channel includes a Physical Downlink Shared CHannel (PDSCH). PDCCH is POKPaging channel (Transport channel) and Downlink-shared (DL_SCH)

Information related to resource allocation of the 135 channel, uplink scheduling grant, and HARQ information is informed to each UE or UE group. Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH. Accordingly, the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data. Transmitted over the PDCCH

140 Control information is referred to as downlink control information (DCI). DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups. The base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC contains a unique identifier (eg, RNTI (Radio) depending on the owner or purpose of the PDCCH.

145 Network Temporary Identifier)).

4 illustrates a structure of an uplink subframe used in a 3GPP system. Referring to FIG. 4, a subframe 500 having a length of 1 ms, which is a basic unit of LTE uplink transmission, is composed of two 0.5 ms slots 501. Assuming the length of the Normal Cyclic Prefix (CP), each slot has seven symbols (502).

150 symbols and one symbol correspond to one SC-FDMA symbol. A resource block (RBK503) is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of an uplink subframe of LTE is largely divided into a data region 504 and a control region 505. The data area means a communication resource used in transmitting data such as voice and packet transmitted to each terminal and is a PUSCH (Physical).

155 Uplink Shared Channel). The control region means a communication resource used to transmit an uplink control signal, for example, a downlink channel quality report from each user equipment, a reception ACK / NACK for the downlink signal, an uplink scheduling request, and the like. PUCCHCPhysical Uplink Control Channel ). The sounding reference signal (SRS) is the last on the time axis in one subframe.

160 is transmitted via the SC-FDMA symbol located. To the last SC-FDMA in the same subframe SRSs of the various terminals to be transmitted may be classified according to frequency position / sequence.

5 illustrates a communication system including a relay (or relay node (RN)). The relay facilitates the service by extending the service area of the base station or installing in a shaded area. 5, a wireless communication system includes a base station, a relay and

165 includes a terminal. The terminal performs communication with the base station or the relay. For convenience, a terminal that communicates with a base station is referred to as a macro UE, and a terminal that communicates with a relay is referred to as a relay UE. The communication link between the base station and the macro terminal is referred to as a macro access link, and the communication link between the relay and the relay terminal is referred to as a relay access link. In addition, communication between the base station and the relay

The 170 link is referred to as the backhaul link.

Relays can be classified into LlUayer 1) relays, L2 (layer 2) relays, and L3 (layer 3) relays according to how much they perform in multi-hop transmission. Each brief feature is shown below. The L1 relay usually performs the function of a repeater and simply amplifies the signal from the base station / terminal to the terminal / base station.

175 Send. Although the relay does not perform decoding, the transmission delay is short, but the signal and noise are indistinguishable. To compensate for this drawback, you can use an UL repeater or an advanced repeater (advanced repeater or smart repeater) with features such as self-interference cancellation. L2

The operation of the 180 relay may be represented as decode-and-forward and may transmit user plane traffic to L2. The advantage is that the noise is not amplified, but the delay due to decoding increases. L3 relays, also known as self-backhauling, can send IP packets to L3. It also includes RRCCRadio Resource Control (RRCCRadio Resource Control) capabilities

185

The LI and L2 relay may be described as a case where the relay is part of a donor cell covered by the corresponding base station. When the relay is part of a donor cell, the relay is a relay The relay cannot have its own cell ID because it does not control its own cell and its terminals. However, a relay ID, which is an ID of a relay, may have a relay ID. Also

In this case, some functions of RRM (Radio Resource Management) are controlled by the base station of the donor cell, and a part of the RRM may be located in the relay. An L3 relay is when a relay can control its own cell. In this case, the relay may manage one or more cells, and each cell managed by the relay may have a unique physical-layer cell ID. The same RRM mechanism as the base station

195 may be connected to a cell managed by a relay or a cell managed by a general base station.

In addition, relays are classified as follows according to mobility.

Fixed RN: Fixed permanently, used to increase shadow area or cell coverage. Simple Repeater function is also available.

200-Nomadic Relay (Nomadic RN): A relay that can be temporarily installed or moved randomly within a building when the user suddenly increases.

Mobile RN: Relays that can be mounted on public transport such as buses or subways.

In addition, the following classification is possible according to the link between the relay and the network. In-band connection: The network-to-relay link and the network-to-terminal link share the same frequency band within the donor cell.

Out-band connection: Within the donor cell, network-to-relay link and network-to-terminal link use different frequency bands.

In addition, the following classification is possible according to whether the terminal recognizes the presence of a relay. 210-Transparent Relay: The UE cannot know that communication with the network is performed through the relay.

Non-transparent relay: The terminal knows that communication with the network is performed through the relay.

6 shows an example of performing backhaul transmission using a BSFN subframe. 215 In in-bend relay mode, the base station-relay link (ie, backhaul link) operates in the same frequency band as the relay-terminal link (ie, relay access link). In the case where the relay receives a signal from the base station and transmits a signal to the terminal or vice versa, the relay transmitter and receiver cause interference with each other, so that the relay can simultaneously transmit and receive. To this end, the backhaul link and the relay access link are TDM

220 partitioning. LTE-A establishes a backhaul link in an MBSFN subframe to support measurement operations of legacy LTE terminals existing in a relay zone (fake MBSFN method). When any subframe is signaled to the MBSFN subframe, since the terminal receives only the control region (ctrl) of the corresponding subframe, the relay may configure a backhaul link using the data region of the corresponding subframe. For example, the relay PDCCH (R-PDCCH) is

A specific OFDM symbol of the 225 MBSFN subframe may be transmitted using a specific resource region in the last OFDM symbol. .

7 illustrates a carrier aggregation (CA) communication system. The LTE-A system aggregates a plurality of uplink / downlink frequency blocks for a wider frequency band and uses a larger uplink / downlink bandwidth.

230 bandwidth aggregation) technology. Each frequency block is transmitted using a component carrier (CC). CC may be understood as a carrier frequency (or center carrier, center frequency) for a corresponding frequency block.

Referring to FIG. 7, respective CCs may be adjacent to each other or non-adjacent in the frequency domain. The bandwidth of each component carrier can be determined independently. UL CC

It is also possible to merge asymmetric carriers having a different number of 235 and DL CCs. For example, in the case of two DL CCs and one UL CC, the configuration may correspond to 2: 1. The DL CC / UL CC link may be fixed in the system or configured semi-statically. In addition, even if the entire system band is composed of N CCs, the frequency band that can be monitored / received by a specific terminal may be limited to M (<N) CCs. Various parameters for carrier merging

240 may be set in a cell-specific, UE group-specific or UE-specific manner. On the other hand, control information is only through a specific CC It may be set to transmit and receive. This specific CC may be referred to as a primary CCXPrimary CC (PCC) (or anchor CC), and the remaining CC may be referred to as a secondary CCX Secondary CC (SCC).

245 3GPP uses the concept of a cell for the management of radio resources. A cell is defined as a combination of downlink resources and uplink resources, and uplink resources are not required. Therefore, the sal may be configured with only downlink resources, or with downlink resources and uplink resources. If carrier aggregation is supported, the linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource is

250 may be indicated by system information. A cell operating on a primary frequency (or PCC) may be referred to as a primary cell (PCell) and a cell operating on a secondary frequency (or SCC) may be referred to as a secondary cell (SCell). The PCell is used by the terminal to perform an initial connection establishment process or to perform a connection re-establishment process. PCell is in the process of handover

255 may refer to the indicated cell. The SCell is configurable after the RRC connection is established and can be used to provide additional radio resources. PCell and SCell may be collectively referred to as a serving cell. Therefore, in the case of the UE that is in the RRC ONNECTED state, but carrier aggregation is not configured or does not support carrier aggregation, there is only one serving cell configured only with the PCell. On the other hand, the terminal in the RRC_C0NNECTED state and the carrier merge is set

In case 260, one or more serving cells exist, and all serving cells include a PCell and an entire SCell. For carrier aggregation, after the initial security activation process is initiated, the network may configure one or more SCells for terminals supporting carrier aggregation in addition to the PCell initially configured in the connection establishment process.

As described with reference to FIG. 7, the 3GPP LTE-A system is designed to use multiple carriers and can introduce up to five carriers to the downlink / uplink. For example, the system may be configured with two downlink carriers and two uplink carriers. One of the two carriers becomes the primary carrier and the other One is a secondary carrier. If cross carrier scheduling is set,

The 270 primary carrier may perform scheduling for the secondary carrier. For cross carrier scheduling, the DCKdownlink control information transmitted on the primary carrier has a Carrier Indication Field (CIF) field. The CIF field is used to indicate which carrier the DCI on the primary carrier schedules. For example, when the CIF field is 3 bits, eight carriers can be indicated.

275 FIG. 8 shows an example of indicating a carrier using a CIF field. Suppose there are five carriers (CC # 1 to # 5) and CC # 1 is the primary carrier. Referring to FIG. 8, when cross carrier scheduling is configured, the base station transmits a DCI having a CIF field on the primary carrier (CC # 1) to the terminal. DCI includes DCI for UL scheduling or DCI for DL scheduling. On CC # 1

280 The DCI transmitted is applied to CCs (eg, CC # 3 and CC # 5) indicated by the CIF field.

9 shows an example of informing the control region size of each carrier. The control region size (e.g., number of OFDM symbols) of each carrier is indicated using a CFKControl Format Indicator. The CFI for the carrier may be delivered to the UE by a higher layer signal (eg, RRC signal). Figure shows one downlink subframe per carrier

285 is shown and the number in the box represents the OFDM symbol index.

Referring to FIG. 9, CFI may be independently provided for each CC. In a 3GPP system, a control region (eg, PDCCH) and a data region (eg, PDSCH) are separated by a TDM scheme. Accordingly, the terminal interprets the left side as the control region and the right side as the data region based on the OFDM symbol indicated by the CFI. When the control area and the data area are confirmed, the terminal

290 Decoding is performed to receive control information (eg, PDCCH signal) and data (eg, PDSCH signal) in each region.

Signaling with CIF on the Backhaul Link

The DCI format with the CIF field can also be used for the relay backhaul link. The DCI format for multi-carrier is useful when carrier aggregation is introduced in the backhaul link. However, only a limited number of carrier aggregations (e.g. 2) are introduced into the backhaul link, or DCI format with CIF field can be used even when no carrier merge is performed. In this case, the CIF field defined in the DCI format may be used not only for its original purpose but also for conveying other meanings. For example, if only two carriers are used for the backhaul link, the cross carrier scheduling information only needs 2 bits. Also, backhaul

It can be assumed that the primary carrier is always scheduled in the 300 link. In this case, the information for the cross carrier scheduling is divided into 1 bit. Therefore, the extra 1 or 2 bits in the CIF field can be used for other purposes.

Hereinafter, a method of signaling a usage state of a backhaul resource using a CIF field will be described with reference to the drawings. In the following description, eNB PDCCH is a base station

305 indicates a PDCCH transmitted to the UE. The RN PDCCH indicates a PDCCH transmitted by the relay to the UE. R-PDCCH represents a PDCCH transmitted by the base station to the relay. The (R-) PDSCH indicates a PDSCH transmitted by a base station to a relay. Resource allocation for the PDSCH may be made in resource block units, resource block group units, or on one or more consecutive resource blocks according to a resource allocation type.

The 310 R-PDCCH is classified into DL Grant (Downl Grant Grant, DG) and UL Grant (Upl Ink Grant, UG). The DL grant includes information on time / frequency / spatial resources of the (R-) PDSCH corresponding to data that the relay should receive and information for decoding (in other words, scheduling information). The UL grant provides information and decoding on the time / frequency / spatial resources of the (R-) PUSCH corresponding to the data that the relay should transmit on the uplink.

315 Contains information for doing so (in other words, scheduling information). The DL grant is in the RB of the first slot and the UL grant is in the RB of the second slot.

According to the present invention, the extra bits in the CIF field may be used for indicating, for example, what information exists in the relay backhaul subframe. Specifically, if there is an R-PDCCH in the first slot / region, the extra bit in the CIF field is the second.

It may be used to indicate what information (eg R-PDCCH or (R-) PDSCH) is present in the 320 slot / region. More specifically, the extra bits in the CIF field indicate what information (eg, UL grant, (R-) PDSCH) is present in the second slot of the RB pair in which the R-PDCCH is detected. Can be used for purposes.

As another example, according to the present invention, the CIF field may be used to designate a starting point of the (R-) PDSCH (or 325 R-PDCCH) in a subframe. The following cases are possible.

A. Some or all of the CIF fields in the R-PDCCHCDCI format dynamically specify (eg, subframe-by-subframe) the number of symbols of the start symbol of the (R-) PDSCH or the symbol of the eNB PDCCH (or RN PDCCH). Can be used. When the CIF field is used to indicate the number of symbols of the eNB PDCCH (or RN PDCCH), the relay may determine the start position of the (R-) PDSCH based on the number of symbols of the eNB 330 PDCCH (or RN PDCCH). For example, the relationship between the start position of the (R-) PDSCH and the number of symbols in the eNB PDCCH (or RN PDCCH) is pre-specified (e.g. in the form of an offset), so that the relay can be configured from the CIF field to the eNB PDCCH (or RN PDCCH). It is possible to determine the number of symbols and determine the starting position of the (R-) PDSCH from the number of symbols of the eNB PDCCH (or RN PDCCH). The following situations may exist. 335 (a) The case where the R-PDCCH start symbol is fixed: The case where the position of the R-PDCCH is fixed in the time domain and only the start position of the (R-) PDSCH is changed. Since the resource region of the R-PDCCH is fixed in the time domain, the relay only needs to perform blind decoding for receiving the R-PDCCH only within the corresponding time resource region. When an R-PDCCH (DL grant) is detected, the relay receives (R-) PDSCH signal from one or more 340 resource blocks indicated by the DL grant and performs decoding. At this time, the time resource region in which the (R-) PDSCH signal is present is indicated using the bit information of the CIF.

i. Carrier merge case

• For example, some bits (eg 2 bits) in the CIF field may be used for the original CIF 345 and the remaining bits (eg 1 bit) may be used to specify the (R-) PDSCH start position. Since the number of RN PDCCH symbols can be fixed to 1 or 2, there are only two significant positions where there can be a start symbol of (R-) PDSCH (eg, OFDM symbols # 2 and # 3) (when indexing from # 0). In this case, the (R-) PDSCH start position may be designated as 1 bit. 350 ii. Non-CA Case

• If a DCI format with CIF is predefined to be used even if a CA is not set, all bits of the CIF can be used to specify the (R-) PDSCH start position.

Alternatively, one bit may be used for 355 for specifying a (R-) PDSCH start position in the CIF field, and the remaining bits may be used for resource allocation (RA). For example, if downlink resource allocation is made in RBG (Resource Block Group) units and one RBG is composed of three RBs, the remaining two bits in the CIF field are the first and second of three RB pairs constituting the RBG. It can be used to indicate what information has been transmitted 360 in the resource area (eg, pilot). Here, the RBG associated with the CIF field may be limited to the RBG from which the DL grant is detected.

• If a DCI format without CIF is used, some bits in the existing RA bits can be used to inform the (R-) PDSCH start position and / or information about the second slot (eg usage status).

365 (b) When the R-PDCCH start symbol is changed (semi-static / semi-dynamically): The start position of the R-PDCCH / (R-) PDSCH in the time domain may be changed. However, the period in which the start position of the R-PDCCH and the start position of the (R-) PDSCH may vary may be different. For example, in order to reduce the system complexity, the variation of the R-PDCCH start symbol may be semi-static / semi-dynamic. Variable of R-PDCCH start symbol is CIF

If indicated using 370, the R-PDCCH start symbol may not be known before receiving the R-PDCCH. Accordingly, the relay must perform blind decoding for R-PDCCH reception in a plurality of candidate time resource regions. If an R-PDCCHCDL grant is detected, the relay can confirm therefrom the start symbol of the R-PDCCH. The relay is then (R-) PDSCH from one or more resource blocks indicated by the DL grant.

375 Receive a signal and perform decoding. At this time, the time resource region in which the (R-) PDSCH signal is present is indicated using the bit information of the CIF. i. Carrier merge case

^• part from CIF field as described above, the bit (e.g., two bits) is used as the original CIF use the remaining bits (e. G., 1 bit) can be used to specify the (R-) PDSCH starting position.

i i. Non-CA case

• All bits of the CIF can be used to specify the (R-) PDSCH start symbol position if the DCI format with CIF is predetermined to be used, even if CA is not configured.

• Alternatively, one bit may be used to designate a (R-) PDSCH start position in the CIF field, and the remaining bits may be used for RA. For example, one bit in the CFI field indicates whether the (R-) PDSCH start position is OFDM symbol # 2 or # 3, and the remaining two bits are R-PDCCH / (R-) PDSCH / empty placement. ) Can be used to indicate

B. The CIF information is used to carry semi-static information about the number of symbols of the start symbol of the (R-) PDSCH or the RN PDCCH.

(a) The start position of the (R-) PDSCH and the R-PDCCH may be transmitted using CIF. This method may be combined with the method of notifying the RRC of the starting positions of the (R-) PDSCH and the R-PDCCH or may be used separately if necessary. In particular, since the CIF field is a dynamic information field, when the CIF field is used for carrying semi-static information, the CIF field can be used to convey more specific information because there is enough space. For example, in the case of indicating the start position of the (R-) PDSCH / R-PDCCH using 2 bits in the CIF field, the first 1 bit gives information about the start position, and the second 1 bit is semi-static. Can be toggled to In this case, whether the (R-) PDSCH and / or the R-PDCCH start position is changed by toggling the second 1-bit information may be changed by using the first 1-bit information received in the meantime. Hereinafter, referring to FIGS. 10 to 14, the CIF field is used to determine the (R-) PDSCH (or R-PDCCH).

405 illustrates in more detail a method of indicating a starting point. The figure corresponds to one downlink subframe (eg, MBSFN subframe) and the number in the box indicates the OFDM symbol index. In order to help the understanding of the present invention, only R-PDCCH for DL grant and (R-) PDSCH corresponding thereto are shown.

FIG. 10 shows (R-) PDSCH using CIF with the start position of R-PDCCH fixed

410 illustrates a method of dynamically notifying a starting position. Referring to FIG. 10, the location of the R-PDCCH is fixed to OFDM symbol # 3. R— A method of fixing the PDCCH may be used, either permanent or semi-static. If the start position of the R-PDCCH is semi-statically fixed, RRC signaling is required to support variability. On the other hand, the start position of the (R-) PDSCH is dynamically indicated using CIF. In this example, the start position of the (R-) PDSCH is OFDM

A case indicated by 415 symbol # 2 is illustrated. Accordingly, the relay decodes using resources of OFDM symbols # 3 to # 6 to receive an R-PDCCH and decodes using resources of 0FDM symbols # 2 to # 6 to receive an R-PDSCH.

The indication of the start position of the (R-) PDSCH using the CIF may be variously implemented. As an example, at least some bits (eg, 1 or 2 bits) in the CIF field may include

420 may directly indicate a start position (eg, 0FDM symbol # 2). As another example, at least some bits in the CIF field may indicate a difference (eg, an offset) from a reference position. For example, the reference position for specifying the start position of the (R-) PDSCH may be 0FDM symbol # 2 (in this example, the offset is +1) or the start position of the R-PDCCH (the offset in this example is − 1 applies). More specifically, the RRC signaled CFI is set to the starting position of the R-PDCCH.

425 The CIF information of the DCI format may be used for indicating a difference between the R-PDCCH start symbol and the (R-) PDSCH start symbol.

[Equation 1]

R-PDCCH starting symbol = CFI and,

(R-) PDSCH starting symbol = CFI + Δ (eg ᅀ = 0 or _1, signaled by CIF) If 430 CA is set, the CIF field specifies the starting position of the (R-) PDSCH. Unused bits are used to indicate the carrier to which the R-PDCCH is applied depending on the intended use. On the other hand, if the CA is not set, the bits that are not used to specify the starting position of the (R-) PDSCH in the CIF field may be used for other purposes, for example, the resource usage status of the second slot (eg UL grant existence). Can be used to indicate.

435 The above description focuses on the case where the start position of the R-PDCCH is fixed and the start position of the (R-) PDSCH is variable. However, the present invention is also applicable to the case where the start position of the (R-) PDSCH is fixed and the start position of the R-PDCCH is variable.

11 to 12 illustrate a method of notifying the start position of the R-PDCCH and the (R-) PDSCH start position using CIF. FIG. 11 illustrates a case in which the start position of the R-PDCCH and the (R-) PDSCH start position are independently provided 440. FIG. 12 illustrates a case in which the start position of the R-PDCCH and the (R-) PDSCH start position are equally limited. This scheme is basically the same as described with reference to FIG. 10 except that the location of the R-PDCCH is also changed using CIF. The present scheme can be applied to different start positions of R-PDCCH for each carrier. In order to specify the starting position of the R-PDCCH / (R-) PDSCH, all or part of 445 bits of the CIF field may be used. If the start position of the R-PDCCH / (R-) PDSCH cannot be freely designated by using only some bits of the CIF field, some bits of the CIF field may be used in combination with other values. For example, some bits of the CIF field and CFI may be combined to designate a start position of the R-PDCCH / (R-) PDSCH.

Equation 2 shows a case where a combination of CFI and CIF is used.

450 [Equation 2]

R-PDCCH start ing symbol = f (CFI, CIFa), and / or

(R-) PDSCH start ing symbol = f b (CFI, CIFb)

Here, fa and fb represent functions having CFI and CIF as arguments. fa and fb can be given differently or equally. For example, f _a and fb may be in the form of CFI + 455 A a and CFI + b, respectively. In this case, Δ 3 and ΔΙ) may mean a difference value (offset) determined by the CIF value. CIFa and CIFb represent all or some bits of the CIF field. CIFa and CIFb can have different values or the same value have. When CIFa and CIFb have different values, CIFa and CIFb may be treated with different bits of the CIF field, respectively.

460 For example, if only one bit can be specified in the CIF field and only two symbol positions can be designated, the CIF information can be used for notifying only the difference value based on the RRC signaled CFI information for each carrier. Do.

In the above description, the scheduler transmits using only DCI formats including the CIF field when the CA is set in the backhaul link, and the CIF field is not set when the CA is set.

465 may be restricted to transmit using only DCI formats that are not included. When the CA is set, the above-described methods can be applied using a limited bit CIF. In the case of Non-CA, CIF is not available, so that by reinterpreting the existing RA bits, the extra bits can be used for the previously presented method.

On the other hand, the backhaul always uses the DCI format with CIF, regardless of whether it is CA

470 may be restricted to use. In this case, the entire non-CA CIF field may be used for other purposes. This allows more free resource allocation and R-PDCCH multiplexing in non-CA mode.

13-14 illustrate a method of informing the R-PDCCH and / or (R-) PDSCH start position in a situation where a plurality of CCs are configured and there are a plurality of relays.

475 FIG. 13 illustrates a case in which CFIs are independently designated for each CC, and R-PDCCH start positions of all RNs are set / fixed to the same position in the corresponding CC. When the start position of the R-PDCCH is fixed, the start position of the R-PDCCH may be fixed at a specific symbol position at all times or semi-statically. If it is fixed semi-statically, the starting position of the R-PDCCH may be specified semi-statically using the RRC CA CFI. On the other hand, in this example the (R-) PDSCH of the RN

The 480 start position may be set differently for each RN using the CIF.

FIG. 13 assumes that two carriers are merged and two relays RN1 and RN2 use both CC # 1 and CC # 2. Although the CFI is set independently for each CC and the relays using the respective CCs may be set differently, it is assumed that RN1 and RN2 use both CC # 1 and CC # 2 for convenience. Each RN compares the RN PDCCH size (k = l or 2) to each other. 485 Can be set differently. In addition, it is assumed that the RN PDCCH size can be set differently when CC is different from one relay point of view. For example, as shown, the RN PDCCH size of RN1 in CC # 1 is 2, the RN PDCCH size of RN2 is 1, the RN PDCCH size of RN1 in CC # 2 is 1, and the RN PDCCH size of RN2 is 2 Can be given. In this case, the start position of the (R-) PDSCH in a specific CC is the full or CIF field of the DCI format that supports the CC.

490 can be indicated using some bits (eg, 1 bit).

In particular, since the starting position of the R-PDCCH and the starting position of the (R-) PDSCH are almost the same, and it may be common to have only one symbol difference between them, the R-PDCCH starting position is used by using additional information of about 1 bit. A method of informing relative information about PDCCH may be used. [Equation 3]

495 (R-) PDSCH starting symbol position-R-PDCCH starting symbol position + Δ

(Δ = 0 or -1)

Here, Δ is indicated using 1 bit information of the CIF field.

For example, in the case of RN1 in CC # 2, it can be seen that the R-PDCCH start symbol is # 3, and the (R-) PDSCH start symbol is # 2, which is calculated by 2 = 3-1 (Δ = -1). do.

500 FIG. 14 illustrates a case in which a CFI is independently designated for each CC and an R—PDCCH start position of each RN may be set differently in the corresponding CC. The R-PDCCH start position of each R may be independently set by using an RRC signal or independently by using the number of CFI and RN PDCCH symbols for each CC. In addition, in this example, the (R-) PDSCH start position of the RN may be set differently for each RN using CIF as shown in FIG. 13. This plan

Since the R-PDCCH start position of each RN in the 505 CC is basically the same as in FIG. 13, the details are described with reference to FIG. 13.

As another example, the following constraints may be additionally considered. This makes resource management easier.

(a) RN PDCCH sizes of all RNs using the corresponding CC for each CC (i.e., OFDM symbol

510 number 00) is kept the same.

-RN1 = RN2 = k for each CC # i (i = l, 2, 3 ...) (b) The RN PDCCH size for each RN maintains the same value across all CCs.

_ RN1 = kl for al l the CCs (CC # 1, CC # 2 ...)

-RN2 = k2 for al l the CCs (CC # 1, CC # 2 ...

515 Although the above description has been described focusing on the relationship between the base station and the relay, the above description may be equally / similarly applied to the relationship between the base station and the terminal, and the relay and the terminal. For example, when applied to the relationship between the base station and the terminal, in the above description, the relay may be replaced with the terminal. In addition, when applied to the relationship between the relay and the terminal, in the above description, the base station may be replaced with a relay and the relay may be replaced with a terminal.

520 FIG. 15 illustrates a base station, a relay, and a terminal applicable to the present invention.

Referring to FIG. 15, a wireless communication system includes a base station (BS) 110, a relay (RN, 130), and a terminal (UE) 130. For convenience, the terminal connected to the relay is shown, but the terminal may be connected to the base station.

The base station 110 includes a processor 112, a memory 114, and a radio frequency:

525 RF) unit 116. The processor 112 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 114 is connected with the processor 112 and stores various information related to the operation of the processor 112. The RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal. The relay 120 includes a processor 122, a memory 124, and a radio frequency unit 126. Processor 122

530 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122. The RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal. The terminal 130 includes a processor 132, a memory 134, and an RF unit 136. The processor 132 is configured to implement the procedures and / or methods proposed in the present invention.

535 may be configured. The memory 134 is connected with the processor 132 and stores various information related to the operation of the processor 132. The RF unit 136 is connected with the processor 132 and transmits and / or receives a radio signal. The base station 110, the relay 120, and / or the terminal 130 may have a single antenna or multiple antennas. The embodiments described above are in the form of elements and features of the present invention.

540 combined. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to constitute an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments

545 may be included in other embodiments or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

In this document, embodiments of the present invention are mainly data between a terminal, a relay, and a base station.

550 has been described focusing on the transmission and reception relationship. Certain operations described in this document as being performed by a base station may, in some cases, be performed by an upper node thereof. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. The base station

555 may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, etc. In addition, the terminal may be a UE Jser Equipment (MS), a Mobile Station (MS), or a MSS (Mobile). Subscriber Station).

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.

560 For implementation by hardware, an embodiment of the present invention may include one or more ASICs application specific integrated circuits, DSPs digital signal processors, DSPDs (digital signal processing devices), programmable logic devices (PLDs), FPGAs C field programmable gate arrays. ), A processor, a controller, a microcontroller, a microprocessor, or the like.

565 In the case of implementation by firmware or software, an embodiment of the present invention It may be implemented in the form of a module, procedure, function, etc. that performs the described functions or operations. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit of the invention. Therefore, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

575 【Industrial Availability】

The present invention relates to a wireless communication system, and specifically, may be applied to a base station, a relay, and a terminal.

Claims

[Range of request]

580 【claim 1】

A method for receiving a downlink signal in a wireless communication system, the method comprising: receiving a downlink control channel signal having a carrier indication field (CIF) and resource allocation information; And

Receiving a downlink shared channel signal from at least one resource 585 block indicated by the resource allocation information in a subframe,

And a start position of a 0rthogonal frequency division multiplexing (0FDM) symbol in which the downlink shared channel signal is present in the subframe is indicated using bit information of the CIF.

[Claim 2]

590 The method of claim 1,

Some of the bit information of the CIF indicates a carrier in which the downlink shared channel signal exists, and the rest of the bit information of the CIF indicates a start position of an OFDM symbol in which the downlink shared channel signal exists. How to.

[Claim 3]

595 The method of claim 1, wherein

Some of the bit information of the CIF indicates a resource usage state in the second slot of the subframe, and the remaining of the bit information of the CIF indicates the start position of an OFDM symbol in which the downlink shared channel signal is present. Characterized by the method.

600

[Claim 4]

The method of claim 1,

The bit information of the CIF indicates a difference between a start position of a 0FDM symbol in which a downlink control channel signal exists and a start position of a 0FDM symbol in which the downlink shared channel signal exists in the subframe. .

605 【claim 5】 The method of claim 1,

And a start position of an OFDM symbol in which the downlink shared channel signal is present is indicated using bit information of the CIF and a control format indicator (CFI) value.

610

[Claim 6]

The method of claim 1,

The CFI value is received using a Radio Resource Control (RRC) signal.

[Claim 7]

615. The method of claim 1,

Wherein the downlink control channel signal is a relay physical downlink control channel (R-PDCCH) signal, and the downlink shared channel signal is a relay physical downlink shared channel (R-PDSCH) signal.

[Claim 8]

A communication device configured to receive a downlink signal in a 620 wireless communication system,

RFCRadio Frequency) unit; And

Including a microprocessor ，

The microprocessor receives a downlink control channel signal having a carrier indication field (CIF) and resource allocation 625 information, and receives a downlink shared channel signal from one or more resource blocks indicated by the resource allocation information in a subframe. Configured to

And a start position of an OFDMCOrthogonal Frequency Division Multiplexing) symbol in which the downlink shared channel signal is present in the subframe is indicated using bit information of the 630 CIF.

[Claim 9]

The method of claim 8, Some of the bit information of the CIF indicates a carrier in which the downlink shared channel signal exists, and the remaining of the bit information of the CIF indicates a start position of an OFDM symbol in which the downlink shared channel 635 signal exists. Communication device.

[Claim 10]

The method of claim 8,

Some of the bit information of the CIF indicates a 640 resource use state in the second slot of the subframe, and the remaining of the bit information of the CIF indicates a start position of an OFDM symbol in which the downlink shared channel signal is present. Characterized in that the communication device.

[Claim 11]

The method of claim 8,

645 the bit information of the CIF indicates a difference between a start position of an OFDM symbol in which a downlink control channel signal exists and a start position of an OFDM symbol in which the downlink shared channel signal exists in the subframe; Communication device.

[Claim 12]

The method of claim 8,

650 The starting position of the 0FDM symbol in which the downlink shared channel signal is present is

A communication device characterized by being indicated using bit information of the CIF and a CFKControl Format Indicator) value.

[Claim 13]

According to that 18

655 The CFI value may be received using a Radio Resource Control (RRC) signal.

[Claim 14]

The method of claim 8,

The downlink control channel signal is R-PDCCH (Relay Physical Downl Ink Control) And a downlink shared channel signal is a relay physical downlink shared channel (R-PDSCH) signal.