WO2013141492A1

WO2013141492A1 - Method and apparatus for indicating resource usage of ephich or phich

Info

Publication number: WO2013141492A1
Application number: PCT/KR2013/001539
Authority: WO
Inventors: 박동현
Original assignee: 주식회사 팬택
Priority date: 2012-03-19
Filing date: 2013-02-26
Publication date: 2013-09-26
Also published as: KR20130106223A

Abstract

The present invention relates to a method and an apparatus for controlling PHICH dynamic resource allocation. A method for indicating ePHICH or PHICH resource usage, according to one embodiment of the present invention, comprises the steps of: a base station transmitting to user equipment indication information for indicating the resource usage of the extended physical hybrid ARQ indicator channel (ePHICH)/PHICH; the base station scheduling the resource which is required for uplink allocation according to the indication information, and then transmitting to the user equipment control information which indicates the uplink allocation by the user equipment; receiving from the user equipment a signal which is uplink-transmitted; and transmitting a wireless signal including response information with respect to the uplink transmission, which is determined in accordance with the indication information and/or the control information and mapped inside of the ePHICH or PHICH resource, wherein the indication for using the resource is semi-statically or dynamically switched by using radio resource control.

Description

Method and apparatus for indicating resource usage of EPHICH or PHICH

The present invention proposes a dynamic switching transmission scheme between an enhanced PHICH channel and an existing PHICH channel. In the present invention, the base station and the user terminal may semi-statically or dynamically indicate how the resources of the PHICH channel suitable for the network traffic loading and the channel environment of the user equipment (UE) or the PHICH to be transmitted and received are transmitted.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-A (LTE Advanced) of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services. Therefore, there is a demand for developing a technology capable of transmitting a large amount of data corresponding to a wired communication network. As a method for transmitting a large amount of data, data can be efficiently transmitted through a plurality of CCs. On the other hand, when the number of user terminals controlled by the base station increases, the limit of the resources of the control channel (Control Channel) through which control information is transmitted. In order to solve this problem, a method of transmitting control information to a resource of a data channel in addition to the control channel has been considered. However, no mechanism has been proposed on how to allocate control information to data channel and control channel resources, or how to cope with network traffic changes.

The present invention proposes a dynamic switching transmission scheme between an enhanced PHICH channel (enhanced PHICH, or extended PHICH, hereinafter ePHICH) that can be considered in a next generation LTE system, and an existing PHICH channel. Through the proposed scheme, we want to obtain a more dynamic and flexible PHICH transmission scheme according to the network traffic loading and UE channel environment. In addition, the PHICH and ePHICH resources that can be used in the entire network can be used more efficiently.

In a method for indicating the use of ePHICH or PHICH resources according to an embodiment of the present invention, the base station transmits the indication information indicating the use of extended physical hybrid ARQ Indicator CHannel (ePHICH) / PHICH resources to the user terminal, the base station is Scheduling the resources required for uplink allocation according to the indication information and transmitting control information indicating the uplink allocation of the user terminal to the user terminal, receiving a signal transmitted uplink from the user terminal, and Transmitting a radio signal including response information for the uplink transmission mapped in ePHICH or PHICH resource determined according to the indication information and / or the control information, wherein the indication of resource use is RRC (Radio Resource) Semi-static or dynamic switching using a control.

According to another embodiment of the present invention, a method for indicating the use of ePHICH or PHICH resources includes receiving, by a user terminal, indication information indicating an extended PHICH (ePHICH) / PHICH resource usage from a base station; Receiving indicative control information from the base station, transmitting a signal to an uplink channel to the base station, and transmitting the uplink mapped in an ePHICH or PHICH resource determined according to the indication information and / or the control information Receiving a radio signal including the response information for a signal, the indication of resource use is characterized in that the semi-static (semi-static) or dynamic switching using the Radio Resource Control (RRC).

A base station according to another embodiment of the present invention includes a transmitter and a receiver for transmitting and receiving a signal to and from a user terminal, an instruction information generator for generating instruction information for indicating the use of extended PHICH / PHICH resources, the transmitter, the receiver, And a control unit for controlling the indication information generation unit, wherein the control unit controls to transmit the indication information to the transmitter, and schedules resources required for uplink allocation according to the indication information so that the transmission unit uplinks the user terminal. The control unit controls the transmitter to transmit the control information indicating the allocation to the user terminal, and when the receiver receives the uplink transmitted signal from the user terminal or fails to receive the uplink, the controller controls the indication information. And / or mapped in an ePHICH or PHICH resource determined according to the control information. The transmitter is controlled to transmit a radio signal including response information for the uplink transmission, and the indication of resource use is semi-static or dynamically switching using RRC (Radio Resource Control). It is done.

A user terminal according to another embodiment of the present invention includes a transmitter and a receiver for transmitting and receiving a signal to and from the base station, a control unit for controlling the transmitter and the receiver, the receiver for indicating the ePHICH (extended PHICH) / PHICH resources When receiving the information from the base station, and after receiving the control information indicating the uplink allocation from the base station, the control unit controls the transmitter to transmit a signal on the uplink channel to the base station, the control unit The response information is extracted from a radio signal including response information for the uplink transmitted signal mapped into an ePHICH or PHICH resource determined according to the indication information and / or the control information, and the indication of resource use is RRC. Semi-static or dynamic switching using Radio Resource Control do.

FIG. 1 is a diagram illustrating an example in which uplink traffic is heavy and uplink SPS (Semi Persistent Scheduling) is operated in CoMP scenario 4 having the same cell ID.

FIG. 2 is a diagram illustrating ePHICH / PHICH switching by dynamic fallback of a PUSCH indicated by PDCCH or ePDCCH according to an embodiment of the present specification.

3 is a diagram for setting and indicating a DMRS-CS indication group for each UE according to an embodiment of the present specification.

4 is a diagram illustrating an ePHICH or PHICH setting for each subframe in an FDD environment according to an embodiment of the present specification.

FIG. 5 illustrates an ePHICH or PHICH setting for each subframe in a TDD environment according to an embodiment of the present specification.

FIG. 6 is a diagram illustrating a case in which ePHICH / PHICH transmission for each subframe is set according to an embodiment of the present specification.

7 is a diagram illustrating a process of allocating PHICH or ePHICH resources in a base station according to one embodiment of the present specification.

8 is a diagram illustrating a process in which a user terminal is allocated a PHICH or ePHICH resource according to an embodiment of the present specification.

9 is a diagram illustrating a configuration of a base station according to one embodiment of the present specification.

10 is a diagram illustrating a configuration of a user terminal according to one embodiment of the present specification.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The wireless communication system in the present specification is widely deployed to provide various communication services such as voice, packet data, and the like.

The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS. It may be called other terms such as Base Transceiver System, Access Point, Relay Node.

That is, in the present specification, a base station or a cell is interpreted in a comprehensive sense to indicate some areas or functions covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB or a sector (site) in LTE, and the like. It is meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node communication range.

In this specification, a user terminal and a base station are specifically referred to in a comprehensive sense as two transmitting and receiving entities used to implement the technology or technical idea described in this specification, that is, as a comprehensive meaning as two (uplink or downlink) transmitting and receiving entities. It is not limited by a term or a word. Here, the uplink (Uplink, UL, or uplink) means a method for transmitting and receiving data to the base station 20 by the user terminal 10, the downlink (Downlink, DL, or downlink) is the base station 20 By means of transmitting and receiving data to the user terminal 10 by means of.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

In addition, in systems such as LTE and LTE-A, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH). A data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.

The PHICH has a function of transmitting, by the base station, HARQ ACK / NACK information for uplink transmission (PUSCH) of the terminal to the terminal. One process of generating PHICH is that one bit of HARQ ACK / NACK information uses 12 Walsh spreadings, three repetition codings, and BPSK modulation. Create The 12 complex symbols generated are allocated to three resource element groups (REGs) that form four consecutive REs in a region excluding the region in which the PCFICH and RS are allocated in the control region.

In addition, cell-specific scrambling (cell-specific scrambling), has a transmit end diversity (Tx diversity), and can use the same antenna port as the PBCH. Meanwhile, in the frequency division modulation (FDD) scheme, a PHICH of subframe n + 4 may be transmitted with respect to an uplink transport block transmitted in subframe n. In the present specification, that a specific channel is transmitted may mean that specific information is mapped to a resource to which the channel is allocated and transmitted as a signal.

The PHICH resource allocation formula includes PHICH group information and sequence information.

May be indicated. here,

Group Information (

) Indicates a group of PHICH resources, and the sequence information (

) Indicates a sequence of PHICH resources. The UE confirming the group and sequence of PHICH resources based on the two informations can check the ACK / NACK information on the data transmission block (eg PUSCH, Physical uplink shared channel) that has been uplinked.

The process of calculating the group information and the sequence information is shown in Equation 1.

[Equation 1]

As can be seen from Equation 1, the information indicating the PHICH resource is affected by the index information of the physical resource block (PRB) for PUSCH transmission. However, when the number of user terminals to transmit the PUSCH increases, in order to avoid being allocated the same PHICH resources, PRB should be scheduled, which does not effectively use the data channel. On the other hand, in order to efficiently use the data channel, there is a problem in that all PHICH resources cannot be allocated within a limited control channel.

Accordingly, in the present specification, an scheduling scheme is solved by introducing an enhanced PHICH (or extended PHICH). Since the ACK / NACK information has a small size, a plurality of A / N information may be allocated on one PRB-pair or PRB. In addition, the ePHICH is a distributed control region that is used by the base station multiplexing A / N information to be transmitted to a plurality of UEs for more efficient use of resources and by ePDCCH for more robust transmission. It can be implemented in such a way that it is transmitted in a distributed control region.

In this case, there is a need for a method of indicating or configuring the UE whether the PHICH resource exists in an existing control channel or in a distributed control region including an ePDCCH. Hereinafter, a PHICH resource existing in an existing control channel is referred to as PHICH, and a PHICH existing in addition to the existing control channel is referred to as ePHICH.

There are RRH1 110 and RRH2 120, which are remote radio heads (RRHs), in a cell region of a macro eNB (Macro eNB) 100. UE1 111 and UE3 113 exist in the RRH1 110 cell region, and UE 2 122 and UE4 124 exist in the RRH2 120 cell region. UE5 105 and UE6 106 transmit and receive data with the macro eNB 100.

UE3 113 is receiving the existing PHICH based on CRS port 0. The macro eNB 100 transmits the PHICH to all UEs on the entire network through the CRS port 0. However, UE3 may receive the ePHICH transmitted by the RRH1 110 based on the DMRS port together with the UE1 111. Therefore, in this case, the network managed by the eNB 100 may control whether to receive an ePHICH or a PHICH from each UE.

For example, referring to the dynamic fallback method, which is based on the transmission of the ePHICH but dynamically allocates PHICH resources, as shown in FIG. 2.

The Rel-11 UE configured to use ePHICH resources in 210 or 220 of FIG. 2 may be configured to fallback using existing PHICH resources under a specific condition. In 210, the ePDCCH indicates a corresponding PUSCH transmission, and in 220, a PDCCH indicates a corresponding PUSCH transmission. In FIG. 2, the UE refers to a situation in which ePHICH resource usage is set as a default. In this situation, the eNB can use PHICH and ePHICH resources more efficiently in consideration of traffic loading of the entire network, its PHICH and ePHICH usage, and the geographical location and channel environment of each UE. For this purpose, the appropriate PHICH / ePHICH resources may be switched or triggered to be dynamically indicated. The above traffic loading may take into account the amount of PUSCH transmission for each UE or whether an uplink SPS (UL SPS) is used.

In the dynamic indication method of PHICH and ePHICH resource use, there are a switching method and a triggering method. In addition, whether or not the ePHICH or PHICH resource set as a default exists for each UE and may change in a predetermined indication.

Hereinafter, an example in which an ePHICH is set as a base but a base station dynamically instructs a UE to use ePHICH / PHICH resources in consideration of a switching method will be described. However, this corresponds to an embodiment, and an embodiment for setting the PHICH as a base and considering a switching scheme also falls within the scope of the present invention. Similarly, triggering schemes are also applicable in each case, and these too fall within the scope of the present invention. In addition, the manner in which the PHICH or the ePHICH is determined according to whether the PUSCH indicates the PDCCH or the ePDCCH is also within the scope of the present invention.

Hereinafter, the indication information for dynamically identifying to use any resource of ePHICH or PHICH will be described. As information constituting the indication information, it is possible to dynamically apply which resource, ePHICH or PHICH, is to be used by using information related to uplink allocation. In addition, the indication information may be divided into a specific indication group consisting of a plurality of values, so that when the user terminal and the base station are included in the group, the ePHICH or PHICH resource may be used, and the information included in the uplink allocation may be predetermined conditions or in advance. If it corresponds to the determined characteristic or indication information such as a preset subframe, the ePHICH or PHICH resource may be configured to be used.

Hereinafter, the indication information is information provided by the base station for each of the user terminals or for the user terminals in the entire cell. When the indication information is used, the allocation of the ePHICH or PHICH resource and / or the use of the resource may be dynamically performed. Judging by The indication information may be understood as reference information for controlling dynamic allocation of ePHICH or PHICH resources or dynamic use of resources. The indication information may include specific values to be described later, or may include conditions of specific values, and may include information about a specific time point (for example, a subframe). Hereinafter, an embodiment of a base station will be described with reference to an eNB. However, the present invention is not limited to a specific term and is applicable to all entities managing a network. Similarly, an embodiment of a terminal will be described with reference to a UE, but the present invention is not limited to a specific term, and can be applied to all entities that transmit and receive a signal by accessing a network.

In the first embodiment, a process of determining whether to fall back to a UE is shown based on a cyclic shift (CS) value of a demodulation reference signal (DMRS).

In one embodiment of the CS value of DMRS, it may be a value included in the CS field in the DCI format,

Can be the value of.

In the first embodiment, DMRS CS values are divided into groups for each UE or for the entire cell, and the UE may determine whether a resource including HARQ A / N is an ePHICH or PHICH according to the DMRS CS value. In one embodiment of the indication information, the indication group information includes which DMRS-CS value is set in the ePHICH-DMRS-CS group or which DMRS-CS value is set in the PHICH-DMRS-CS indication group.

The indication group dividing the DMRS CS value is an ePHICH-DMRS-CS indication group and a PHICH-DMRS-CS indication group. The eNB informs the information on the indication group by RRC (Radio Resource Control) signal for each UE or for each cell. In addition, the eNB allocates an uplink to the UE by scheduling the use of ePHICH or PHICH resource with reference to the corresponding indication group.

Hereinafter, transmission of the ePHICH means assigning response information (A / N of HARQ) to the ePHICH resource and using the allocated ePHICH resource. Similarly, transmission of PHICH means assigning response information (A / N of HARQ) to PHICH resource and using the allocated PHICH resource.

The eNB 300 may signal the information about the switching in the RRC configuration (RRC configuration) for ePHICH transmission through UE-specific configuration (UE specific configuration). DMRS-CS indicator group in Figure 3 is shown in Table 1. Table 1 is an embodiment of the indication information.

TABLE 1

UE 1 310 is a PUSCH transmission with a DMRS CS value of 0, 1, 3, 4, 5, 6 is used for ePHICH transmission (ePHICH resource allocation and / or resource use), the

value

2, 7 is PHICH It is notified through RRC setting that it is used for transmission (PHICH resource allocation and / or resource use) (S351). Similarly, UE2 320 has a DMRS CS value of 0 to 6 and PUSCH transmission is used for ePHICH transmission (ePHICH resource allocation and / or resource usage), and a value of 7 indicates PHICH transmission (PHICH resource allocation and / or resource usage). In order to be used in order to be notified in advance through the RRC setting (S352).

In this case, in S351 and S352, the eNB 300 may transmit all of the indication group information of Table 1 for each UE, and may inform only the ePHICH-DMRS-CS indication group or only the PHICH-DMRS-CS indication group.

Thereafter, the eNB 300 performs PHICH scheduling in consideration of traffic conditions and PUSCH resources. As a result, when the use of ePHICH resources is appropriate for the UE1 310, the uplink allocation for the UE1 310 is ePHICH-DMRS-. The UL GRANT is configured to include the DMRS-CS corresponding to the CS indication group (S361). On the other hand, the UE2 320, if the use of PHICH resources is suitable, the uplink allocation (UL GRANT) for the UE2 320 is configured to include a DMRS-CS corresponding to the PHICH-DMRS-CS indication group uplink allocation (S362). Each UE transmits a PUSCH according to uplink allocation (S371, S372), and eNB 300 allocates and transmits ePHICH resource to UE1 310 according to the DMRS-CS value transmitted during the uplink allocation (S371, S372). In operation S381, the UE2 320 allocates and transmits PHICH resources in operation S382. The indication group information of Table 1 may be allocated to the UE, but may also be allocated for each cell, and share information about both indication groups or share information about one indication group, so that the UE collects the other indication groups. Can be obtained. For example, if the eNB 300 informs only the PHICH-DMRS-CS indication group through RRC, UEs indicate that the values not corresponding to the PHICH-DMRS-CS indication group among all DMRS-CS values are ePHICH-DMRS-CS indication. It can be judged as a group.

Meanwhile, as an extended embodiment of the DMRS-CS indication group, a DMRS-CS value may be used as a triggering condition.

Table 2 is an embodiment showing an indication group configuration for triggering to initiate and stop PHICH resource allocation.

TABLE 2

The information in Table 2 indicates a trigger condition for falling back to resource usage of PHICH for each UE. The information in Table 2 is shared as an RRC configuration between the eNB and the UEs.

The eNB sets the use of the resources of the ePHICH as a basis and uses them to map response information. When the eNB determines that it is necessary to use the resources of the PHICH for UE1, the eNB indicates "PHICH-TRIGGERING" in the indication group information of Table 2. Uplink allocation is made by setting the DMRS-CS value to 0 or 1 with reference to "-ON DMRS-CS". UE1 performs PUSCH transmission according to the DMRS-CS value of 0 or 1 and checks ACK / NACK information mapped to PHICH resources. Thereafter, except for 6 and 7, the eNB performs PHICH transmission (PHICH resource allocation and / or resource use) to UE1 regardless of the value of DMRS CS.

On the other hand, when the eNB determines that ePHICH transmission (ePHICH resource allocation and / or resource use) is required for UE1, DMRS- with reference to "PHICH-TRIGGERING-OFF DMRS-CS" in the indication group information of Table 2 above. When uplink allocation is performed with a CS value of 6 or 7, UE1 performs PUSCH transmission according to the DMRS-CS value of 6 or 7 and checks an ACK / NACK value in the ePHICH resource. Thereafter, except for 0 and 1, the eNB transmits the ePHICH to UE1 regardless of the DMRS CS value.

The indication group information as shown in Tables 1 and 2 may be signaled or preset by the eNB.

In the second embodiment, various information related to uplink allocation is combined to indicate PHICH transmission. An example of various information related to uplink allocation may be a DMRS CS value and a lowest PRB index as the group / sequence information of the PHICH as described in Equation 1 above. In addition, an n_CCE index value for configuring PDCCH or ePDCCH transmission may be used.

The above information can be combined in various ways and used as ePHICH / PHICH indication group information.

This is a method of instructing the use of PHICH resources only when the condition of the combination of a specific CS value and a specific n_CCE index value or the lowest PRB index value is satisfied, without depending on the CS value. . The following shows how the various information is combined to be a condition of fallback.

2-i) DMRS-CS and n_CCE index constituting PDCCH or ePDCCH may be combined and used as ePHICH / PHICH indication information.

For example, based on resource allocation and use through ePHICH, it can be set as Equation 2 as a PHICH fallback condition. mod is a modular operator that takes the remainder.

[Equation 2]

PHICH-Fallback Condition = (DMRS-CS = 7) and (n_CCE mod 2 = 0)

Equation 2 may be a PHICH fallback only when DMRS-CS is 7 and the n_CCE index of ePDCCH or PDCCH is even.

2-ii) The lowest PRB index of DMRS-CS and PUSCH can be combined and used as ePHICH / PHICH indication information.

For example, based on the ePHICH, it can be set as Equation 3 as the PHICH fallback condition.

[Equation 3]

PHICH-Fallback Condition = (DMRS-CS = 7) and (lowest_PRB_index mod 2 = 0)

Equation 3 may be a PHICH fallback only when DMRS-CS is 7 and the lowest PRB index of the PUSCH is even.

2-iii) The n_CCE index constituting the PDCCH or ePDCCH and the lowest PRB index of the PUSCH may be combined and used as ePHICH / PHICH indication information.

For example, based on ePHICH transmission, it may be set as Equation 4 as a PHICH fallback condition.

[Equation 4]

PHICH-Fallback Condition = (n_CCE mod 2 = 0) and (lowest_PRB_index mod 2 = 0)

Equation 4 may be a PHICH fallback only when the n_CCE index of the ePDCCH or PDCCH is even and the lowest PRB index of the PUSCH is even.

2-iv) A DMRS-CS value, an n_CCE index constituting a PDCCH or an ePDCCH, and a lowest PRB index of a PUSCH may be combined and used as ePHICH / PHICH indication information.

For example, based on ePHICH, it can be set as Equation 5 as a PHICH fallback condition.

[Equation 5]

PHICH-Fallback Condition = (DMRS-CS = 7) and (n_CCE mod 2 = 0) and (lowest_PRB_index mod 2 = 0)

Equation 5 may be a PHICH fallback only when DMRS-CS is 7, n_CCE indexes of ePDCCH or PDCCH are even, and even lowest PRB index of PUSCH is even.

Of course, in the above embodiments 2-i) to 2-iv), a method of dividing by 3 or more numbers is possible without dividing by even / odd numbers. In addition, based on PHICH, it may be changed to ePHICH and used to allocate and use resources.

The above fallback conditions may be signaled or preset by the eNB. In addition, a plurality of fallback conditions may be set differently for each UE and may be instructed to the UE. The fallback conditions are necessary conditions for confirming dynamic allocation and use of ePHICH / PHICH resources, which is an embodiment of indication information.

In addition, the above embodiments 2-i) to 2-iv) may be used as the triggering on condition or the triggering off condition described above.

The third embodiment shows whether the HARQ A / N information of the UE will use ePHICH resources or PHICH resources according to an initial downlink control information (DCI) format indicating PUSCH transmission.

In the third embodiment, it may be determined whether to execute PHICH fallback transmission according to which DCI format of the DCI format indicating PUSCH transmission for each UE or for the entire cell is transmitted. For example, a scheme configured for each UE is shown in Table 3. The table below is centered on

DCI format

0 or 4, and which DCI format is used to indicate PHICH or ePHICH may be configured in various ways according to the configuration of the present invention.

TABLE 3

If the ePHICH and / or PHICH indication DCI format information is provided to each of

UEs

1, 2, 3, and 4 based on the RRC configuration, HARQ A / N information may be transmitted using resources of the ePHICH or PHICH according to each configuration. . For example, in Table 3, in case of UE 1 when PUSCH scheduling is performed through DCI format 4, it may indicate that corresponding A / N information may be transmitted through an ePHICH resource.

In consideration of a transmission scheme (SPS, etc.) of a UE, a traffic environment, and the like, the DCI format information shown in Table 3 may be informed by the eNB to the RRC.

The DMRS-CS condition used in Table 1 or Table 2 above or the fallback condition used in Equations 2 to 5 and DCI format information of Table 3 may be used as a condition. The information on which DCI format indicates ePHICH or PHICH for each user terminal is one embodiment of the indication information. The eNB may allocate the indication information of Table 1 for each UE through RRC signaling. In addition, as described above, the same indication information may be set for a plurality of terminals. Even if the same indication information is set, if the DCI format for the actual uplink allocation is different for each user terminal, as a result, dynamic resource allocation and resource use of ePHICH or PHICH are enabled. Accordingly, the eNB may generate the indication information in consideration of the situation of the network or the characteristics of the UE, and provide the indication information to the plurality of user terminals configuring each user terminal or cell. This is applicable to all embodiments of the present specification.

The fourth embodiment is a method of presetting a subframe in which ePHICH or PHICH is transmitted for each subframe. That is, the PHICH or ePHICH transmission method may be determined for each subframe, or the PHICH or ePHICH transmission may be performed with a certain period for each subframe.

The meaning of presetting a subframe in which ePHICH or PHICH is transmitted for each subframe means generating various number or index information of a specific subframe, for example, a subframe in which ePHICH or PHICH is transmitted, and indicating this. This means that the information is shared between the eNB and the UE.

The fourth embodiment will be described divided into FDD / TDD.

First, in the FDD scheme, the following four schemes may be used to make an appointment or preset time between the eNB and the UE by using a resource of an ePHICH or a PHICH. Information on ePHICH / PHICH resource allocation and use for the following subframe may be provided for each UE or grouping some UEs.

4-a-i) This is a scheme for transmitting an eNB using bitmap information on a subframe in which A / N information of HARQ is transmitted in ePHICH or PHICH resource as indication information.

4-a-ii) In order to indicate a subframe to which an ePHICH or PHICH resource is allocated, a predetermined period and an interval may be set as indication information.

For example, a period and an offset value for a subframe capable of using PHICH resources may be set, and a subframe in which the resource is not set may be determined as a subframe in which resources are allocated and used in the ePHICH.

First, 401 is a bitmap that is an embodiment of 4-a-i) and sets resource usage of an ePHICH or PHICH for each subframe.

The 410 sets a subframe (ePHICH configuration subframe) for transmitting HARQ A / N information to the ePHICH to 1, 5, 6, 7, 8, and 9 in one radio frame, and sets the HARQ A / N information to the PHICH. In order to set a subframe (PHICH configuration subframe) to be transmitted to 0, 2, 3, and 4, the bitmap may be set as 420. The bitmap information 420 is set through RRC signaling. The bitmap may be set as 1011100000 by setting the ePHICH configuration subframe to 0 and the PHICH configuration subframe to 1. In an extended embodiment, only the

subframe numbers

0, 2, 3, and 4 of the PHICH configuration subframe may perform RRC signaling.

Next, 402 applies a period and an offset for transmitting PHICH HARQ A / N information according to an embodiment of the present specification.

When the ePHICH configuration subframe is based, the PHICH configuration subframes may be set in a period and an offset. The 450 shows two radio frames. In this case, when the PHICH setting period is set to 2 and the offset is set to 4, a subframe spaced 4 apart from the first subframe in every two radio frames may be set as the PHICH setting subframe (see 460). Alternatively, the PHICH period and the offset may be set based on the subframe.

Meanwhile, if there is more than one PHICH configuration subframe, duration information may also be set. If the transmission period is 2, the offset is 9, and the duration is 2 at 450, a PHICH configuration subframe may be defined as a subframe separated by 9 based on the first subframe of every two radio frames and a subsequent subframe. May be seen (see 470).

In addition to 4-a-iii), the MBSFN subframe may be configured as an ePHICH configuration subframe, and in other subframes, it may be configured as a PHICH configuration subframe.

4-a-iv) Also, an ePHICH or PHICH configuration subframe may be configured by combining the 4-a-i) to 4-a-iii) methods.

Next, the following four schemes may be used so that a subframe preset in the TDD scheme uses an resource of an ePHICH or PHICH, so as to make an appointment or preset configuration between the eNB and the UE.

Table 4 below shows uplink-downlink configurations in a time division modulation (TDD) method in a radio frame composed of 10 subframes. It can be seen that each TDD configuration has a different UL-DL subframe transmission timing.

TABLE 4

The various application methods are as follows.

4-b-i) This is a scheme for transmitting an eNB using bitmap information on a subframe in which A / N information of HARQ is transmitted in ePHICH or PHICH resource as indication information.

Since the downlink subframe is defined in the TDM scheme, a PHICH may be transmitted in a specific subframe among these downlink subframes (including a special subframe).

4-b-ii) In order to indicate a subframe to which an ePHICH or PHICH resource is allocated, a predetermined period and an interval may be set as indication information.

For example, a period and an offset value for a PHICH configuration subframe may be set, and a subframe for which such a configuration is not set may be determined as an ePHICH configuration subframe.

First, 501 is a bitmap that is an embodiment of 4-b-i) and sets resource usage of an ePHICH or PHICH for each subframe.

510 shows TDD setting 2 in Table 4. Here, the downlink subframes are

subframes

0, 1, 3, 4, 5, 6, 8, and 9, respectively. Of these downlink subframes, an ePHICH configuration subframe may be set to 1, 5, 6, 8, and 9, and a bitmap may be configured as 520 to set the PHICH configuration subframe to 0, 3, and 4. The bitmap information 520 is set through RRC signaling. The bitmap may be set as 1001100000 by setting the ePHICH configuration subframe to 0 and the PHICH configuration subframe to 1. In an extended embodiment, only

subframe numbers

0, 3, and 4 of the PHICH configuration subframe may be RRC signaled. In addition, since the ePHICH or PHICH is not transmitted in the uplink subframe, a bitmap may be generated except for the uplink subframe. In this case, the bitmap of 520 may exclude information on

subframes

2 and 7, such as "10110000".

Next, 502 applies a period and an offset for transmitting PHICH HARQ A / N information according to an embodiment of the present specification.

When the ePHICH configuration subframe is based, the PHICH configuration subframes may be set in a period and an offset. 550 shows TDD setting 1 in Table 4. If the PHICH setting period is set to 2 and the offset is set to 4, a subframe spaced 4 apart from the first subframe among the two radio frames may be set as the PHICH setting subframe (see 560). Alternatively, the PHICH period and the offset may be set based on the subframe.

Meanwhile, if there is more than one PHICH configuration subframe, duration information may also be set. In 550, if the transmission period is 2, the offset is 9, and the duration is 2, the PHICH transmission subframe is defined as 9 subframes apart from the first subframe and one subsequent subframe out of every two radio frames. In addition to 4-b-iii), the MBSFN subframe may be configured as an ePHICH configuration subframe and the other subframes may be configured as a PHICH configuration subframe.

4-b-iv) In addition, an ePHICH or PHICH configuration subframe may be configured by combining 4-b-i) to 4-b-iii).

FIG. 6 is a diagram illustrating a case in which ePHICH / PHICH resource usage for each subframe is set according to an embodiment of the present specification.

6 is applicable to both the FDD and the TDD schemes.

In which subframe for each UE, the HARQ A / N information is transmitted using the PHICH resource, that is, the subframe information that is to fall back is notified by the eNB 600 to the UEs 610 and 620 (S651 and S652). . This may transmit the ePHICH / PHICH subframe indication information and may be set by the 4-a-i) to 4-a-iv) or 4-b-i) to 4-b-iv) schemes.

Thereafter, the eNB 600 performs PHICH scheduling in consideration of traffic conditions and PUSCH resources, and the subframe in which uplink scheduling of each

UEs

610 and 620 is transmitted and a HARQ result (ACK / NACK) thereof is transmitted is ePHICH. Uplink allocation (UL GRANT) is performed in consideration of the transmission or the PHICH transmission (S661, S662).

Each UE transmits a PUSCH according to uplink allocation (S671, S672), and the eNB 600 transmits an HARQ result (ACK / NACK) for the transmitted PUSCH to the ePHICH / PHICH transmission configuration of each UE subframe. According to the ePHICH or PHICH is transmitted, the UE also receives HARQ A / N information transmitted in the ePHICH or PHICH according to the ePHICH / PHICH configuration of the subframe in which the HARQ result (ACK / NACK) is received (S681, S682).

In the fifth embodiment, there is a scheme of including indication information indicating an ePHICH or a PHICH in uplink allocation. For example, 1 bit information may be added to

DCI format

0 or 4 related to uplink allocation to indicate ePHICH reception or PHICH reception. For example, it may indicate that HARPH A / N information is included in an ePHICH and 0 in a resource of PHICH through a 1-bit field in the DCI format.

The dynamic ePHICH and PHICH switching or triggering transmission methods discussed so far enable more efficient use and use of ePHICH and PHICH resources and improve the performance of the entire system.

Hereinafter, a process of operating the eNB and the UE described above to implement the present invention will be described. The operation method of the eNB will be described centering on the base station, and the operation method of the UE will be described centering on the user terminal.

FIG. 7 is a diagram illustrating a process of allocating a PHICH or ePHICH resource in a base station according to an embodiment of the present specification, and indicating the use of the resource by semi-static or dynamic switching using RRC (Radio Resource Control). to be.

The base station eNB transmits, to the user terminal, indication information for indicating semi-statically or dynamically such that the ePHICH or PHICH resource is semi-statically or dynamically switched to be allocated (used) (S710). . The indication information refers to information that allows the user terminal to determine whether to transmit the ACK / NACK information through the ePHICH or PHICH resource. Accordingly, the indication information may be provided differently according to the user terminal, or may be commonly provided to a specific cell or specific user terminals. Even if the indication information is given the same, even though the same indication information as the configuration of UE1 is provided to all user terminals in Table 1, since the DMRS-CS value is different according to the user terminals, the ePHICH for each user terminal accordingly. This is because it can dynamically determine whether resources are allocated or PHICH resources.

As the indication information, as described above in the first and second embodiments, control information indicating uplink allocation, for example, a DMRS-CS (Demodulation Cyclic Shift) value for decoding a PDCCH (or ePDCCH), and the control information A fallback condition may be used as shown in

Equations

2, 3, 4, and 5 by combining at least one of an n_CCE index calculated from a PDCCH or an ePDCCH, or a physical lowest index of a PUSCH in which uplink transmission is performed.

In addition, as described above in Tables 1 and 2, indication group information obtained by dividing the DMRS-CS into a predetermined group is also an embodiment of the indication information.

In addition, the indication information may be in the format of PDCCH or ePDCCH indicating the uplink transmission as described above in Table 3 and the third embodiment.

In addition, the indication information may be configuration information that can be identified such that HARQ A / N information is transmitted in a resource of PHICH or ePHICH in a specific subframe, as described with reference to FIGS. 4 to 6.

Thereafter, the base station determines the ePHICH or PHICH resource allocation of the user terminal (S720). The scheduling may be performed for all user terminals, and a resource allocation method may be determined in consideration of characteristics of a specific terminal. In addition, scheduling resources required for uplink allocation according to the indication information transmitted in S710 are transmitted to the user terminal, for example, control information indicating the uplink allocation of the user terminal, for example, PDCCH or ePDCCH (S730).

An example of scheduling according to the indication information is as follows.

As shown in Tables 1 and 2 above, when the indication information is the indication group information obtained by dividing the DMRS-CS into a predetermined group, the DMRS-CS suitable for the ePHICH or PHICH of the corresponding user terminal may be set and included in the control information.

As the indication information is described in the first and second embodiments, control information indicating uplink allocation, for example, a DMRS-CS value for decoding a PDCCH (or ePDCCH), n_CCE calculated in the control information PDCCH or ePDCCH In the case of a fallback condition as shown in

Equation

2, 3, 4, or 5 by combining any one or more of the index or the physical lowest index of the PUSCH in which the uplink transmission is performed, a DMRS-CS value and an n_CCE index to satisfy the condition , Or PRB indexes can be set and included in the control information.

In addition, when the indication information is indicated to be determined according to the format of the PDCCH or ePDCCH indicating the uplink transmission as described above in Table 3 and the third embodiment, the base station is a suitable ePHICH or PHICH resource to be received by the user terminal The appropriate format of the PDCCH or ePDCCH may be selected for allocation. In addition, when the indication information is information included in the PDCCH or ePDCCH, for example, information of 1 bit size, appropriate bit information may be selected and included in the control information. Alternatively, the PHDC may be implemented in the case of PDCCH and the ePHICH may be implemented in the case of ePDCCH, and vice versa.

4 to 6, when the indication information is configuration information for distinguishing A / N information of HARQ is transmitted from PHICH or ePHICH resource in a specific subframe, ePHICH / PHICH is determined in advance. In order to increase PHICH / ePHICH diversity, uplink allocation may be distributed for each subframe. In this case, the subframe may be indicated as semi-static using RRC (Radio Resource Control).

Thereafter, uplink transmission is received from the user terminal (S740). The user terminal includes performing a PUSCH transmission. Thereafter, response information (ACK / NACK of HARQ) is generated for the transmitted PUSCH, and the response information is allocated to an ePHICH or PHICH resource according to the previously transmitted indication information and the scheduled control information or configuration information. Alternatively, the wireless signal including the PHICH is transmitted to the user terminal (S750).

The user terminal receives indication information for dynamically indicating the ePHICH / PHICH resource from the base station (S810). The indication of the resource use is semi-static or dynamically switching using RRC (Radio Resource Control).

As the indication information, as described above in the first and second embodiments, control information indicating uplink allocation, for example, a DMRS-CS value obtained by decoding a PDCCH or an ePDCCH, is calculated from the control information PDCCH or ePDCCH. Any one or more of the n_CCE index or the physical lowest index of the PUSCH in which the uplink transmission is performed may be used as a fallback condition as shown in

Equations

2, 3, 4, and 5.

In addition, the indication information may be in the format of PDCCH or ePDCCH indicating the uplink transmission as described above in Table 3 and the third embodiment. Alternatively, the PHDC may be implemented in the case of PDCCH and the ePHICH may be implemented in the case of ePDCCH, and vice versa.

In addition, the indication information may be configuration information that can be distinguished so that A / N information of HARQ is transmitted in PHICH or ePHICH resources in a specific subframe, as described with reference to FIGS. 4 to 6.

Thereafter, the user terminal receives control information indicating uplink allocation from the base station (S820). According to the above indication information, the user terminal uses DMRS-CS or calculates control information indicating uplink allocation, for example, a DMRS-CS value for decoding PDCCH (or ePDCCH), PDCCH or ePDCCH which is the control information. Combining any one or more of the n_CCE index or the physical lowest index of the PUSCH for the uplink transmission, or according to the format of the PDCCH or ePDCCH indicating the uplink transmission, or according to the subframe to which HARQ response information is transmitted It is possible to check whether ACK / NACK information is received through which channel of PHICH or ePHICH. In addition, it is possible to confirm whether ACK / NACK information is received through PHICH or ePHICH according to information included in the PDCCH or ePDCCH, for example, 1 bit size information.

The user terminal transmits an uplink transmission to the base station according to the instructions indicated in the control information (S830), and the response information for the uplink transmission is allocated the ePHICH or PHICH resource according to the indication information and the control information or configuration information. Receive the included radio signal (S840).

9 is a diagram illustrating a configuration of a base station according to one embodiment of the present specification. In addition to the configuration of FIG. 9, the base station 900 may be configured with various components in order to perform the functions of the base station. The configuration of FIG.

The overall configuration includes an instruction information generator 910, a controller 920, and a transmitter 930 and a receiver 940 that transmit and receive signals.

The base station of FIG. 9 implements a method of controlling PHICH or ePHICH resource allocation dynamically or semi-statically using RRC (Radio Resource Control) as described in the first to fifth embodiments, or performs the above function. And likewise provides a method or function from FIGS. 3 to 7. Therefore, the description of the implementation of the detailed method described above will be omitted.

The transmitter 930 and the receiver 940 transmit and receive signals with the user terminal.

The instruction information generator 910 generates instruction information for dynamically instructing the allocation or use of ePHICH / PHICH resources, and the controller 920 includes the instruction information generator 910, the transmitter 930, and the receiver 940. ). An embodiment of generating the indication information or using the indication information has been described with reference to the first to fourth embodiments.

The controller 920 controls the transmitter 930 to transmit the indication information, and schedules resources required for uplink allocation according to the indication information so that the transmitter 930 instructs the uplink allocation of the user terminal. The transmitter 930 is controlled to transmit control information to the user terminal.

In addition, when the receiver 940 receives an uplink transmission from the user terminal or fails to receive the uplink, the controller 920 controls the indication information and / or control response information about the uplink transmission. The transmitter 930 is controlled to transmit a radio signal including the allocated resource to the user terminal by allocating the ePHICH or PHICH resource according to the information.

10 is a diagram illustrating a configuration of a user terminal according to one embodiment of the present specification. In addition to the configuration of FIG. 10, the user terminal 1000 may be configured with various components to perform the functions of the user terminal. The configuration of FIG. 10 illustrates components of the user terminal necessary to implement the present invention.

The overall configuration includes a controller 1010 and a transmitter 1020 and a receiver 1030 for transmitting and receiving signals.

The user terminal of FIG. 10 implements or performs the above-described method of dynamically allocating or using PHICH resources as described in the first to fifth embodiments, and similarly to FIGS. 3 to 6 and 8. Provide a way or function. Therefore, the description of the implementation of the detailed method described above will be omitted.

The transmitter 1020 and the receiver 1030 transmit and receive signals to and from the base station, and the controller 1010 controls the transmitter 1020 and the receiver 1030.

The receiver 1030 receives indication information from the base station for semi-static or dynamic indication of allocation or use of ePHICH / PHICH resources by using RRC (Radio Resource Control), and after the reception, uplink When the control information indicating the allocation is received from the base station, the control unit 1010 controls the transmitting unit 1020 to uplink transmission to the base station.

The controller 1010 extracts response information on the uplink transmission from an ePHICH or PHICH resource allocated according to the indication information from the radio signal received by the receiver 1030. A method of semi-statically or dynamically indicating allocation of ePHICH or PHICH resources using the indication information has been described in the first to fourth embodiments.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under No. 119 (a) (35 USC § 119 (a)) of the US Patent Act No. 10-2012-0027962 filed with Korea on March 19, 2012. All content is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

Transmitting, by the base station, indication information indicating an extended physical hybrid ARQ indicator channel (ePHICH) / PHICH resource usage to the user terminal;

Transmitting, by the base station, control information indicating uplink allocation of the user terminal by scheduling resources required for uplink allocation according to the indication information to the user terminal;

Receiving an uplink transmitted signal from the user terminal; And

Transmitting a radio signal including response information for the uplink transmission mapped in an ePHICH or PHICH resource determined according to the indication information and / or the control information,

And the indication of resource usage is semi-static or dynamic switching using RRC (Radio Resource Control).
The method of claim 1,

The indication information includes at least one of a Demodulation Reference Signal Cyclic Shift (DMRS-CS) value, an n_CCE index calculated from the control information, or a physical least significant index at which the uplink transmission is performed. How to direct resource use.
The method of claim 2,

The indication information divides the Demodulation Reference Signal Cyclic Shift (DMRS-CS) value into an indication group.

And the base station maps and transmits the response information in the ePHICH or PHICH resource indicated by the DMRS-CS value included in the control information.
The method of claim 2,

The base station further comprises the step of signaling by the base station to the terminal information of the DMRS-CS indicating one of the ePHICH or PHICH, information of the n_CCE index, or information on the physical lowest index in which the uplink transmission is made; Or direct the use of PHICH resources.
The method of claim 4, wherein

The signaling is configured for each UE (UE specific), characterized in that the signaling method, ePHICH or PHICH resource usage.
The method of claim 1,

The control information is a physical downlink control channel (PDCCH) or extended PDCCH (ePDCCH) indicating the uplink transmission,

The indication information is in the format of the PDCCH or ePDCCH, or characterized in that determined according to the information contained in the PDCCH or ePDCCH, method for indicating the use of ePHICH or PHICH resources.
The method of claim 1,

The indication information is a method for indicating the use of ePHICH or PHICH resources, characterized in that it determines to map the response information to the resource to which any one channel of the PHICH or ePHICH is allocated according to a subframe number (Subframe number) .
Receiving, by the user terminal, indication information indicating an extended PHICH (ePHICH) / PHICH resource usage from the base station;

Receiving, by the user terminal, control information indicating uplink allocation from the base station;

Transmitting a signal on an uplink channel to the base station; And

Receiving a radio signal including response information for the uplink transmitted signal mapped in an ePHICH or PHICH resource determined according to the indication information and / or the control information,

And the indication of resource usage is semi-static or dynamic switching using RRC (Radio Resource Control).
The method of claim 8,

The indication information includes at least one of a demodulation cyclic shift (DMRS-CS) value, an n_CCE index calculated from the control information, or a physical lowest index at which the uplink transmission is performed. How to instruct.
The method of claim 9,

The indication information divides the DMRS-CS (Demodulation Cyclic Shift) value into an indication group,

Wherein the user terminal extracts response information mapped to an ePHICH or PHICH resource from the radio signal by using the DMRS-CS value included in the control information.
The method of claim 9,

And receiving, by the UE, the UE from receiving information of the DMRS-CS indicating one of the ePHICH and the PHICH, information of the n_CCE index, or information on the physical lowest index on which the uplink transmission is performed, from the base station. Or direct the use of PHICH resources.
The method of claim 9,

The signaling is configured for each UE (UE specific), characterized in that the signaling method, ePHICH or PHICH resource usage.
The method of claim 8,

The control information is a physical downlink control channel (PDCCH) or ePDCCH indicating the uplink transmission,

The indication information is in the format of the PDCCH or ePDCCH, or characterized in that determined according to the information contained in the PDCCH or ePDCCH, method for indicating the use of ePHICH or PHICH resources.
The method of claim 8,

And the indication information is determined that the response information is mapped to a resource to which any one channel of the PHICH or the ePHICH is allocated according to a subframe number.
Transmitter and receiver for transmitting and receiving a signal with the user terminal;

an indication information generation unit for generating indication information indicating use of an extended PHICH / ePHICH resource;

A control unit for controlling the transmitter, the receiver, and the instruction information generator,

The controller controls the transmitter to transmit the indication information, schedules resources required for uplink allocation according to the indication information, and transmits control information indicating that the transmitter instructs uplink allocation of the user terminal to the user terminal. To control the transmitter to

If the receiver receives the uplink transmission signal from the user terminal, or fails to receive the uplink,

The controller controls the transmitter to transmit a radio signal including response information for the uplink transmission mapped in an ePHICH or PHICH resource determined according to the indication information and / or the control information.

The base station, characterized in that the indication of the resource use is semi-static or dynamic switching using RRC (Radio Resource Control).