JP2019176492A - HARQ feedback using carrier aggregation - Google Patents

Abstract

A method, a radio network node, and a receiver for transmitting HARQ feedback for data transmitted on a downlink using carrier aggregation of a downlink FDD carrier and a TDD carrier are provided. Each downlink subframe on a downlink FDD carrier is associated with an uplink control channel subframe on an uplink FDD carrier. Associate each downlink subframe 210 and special subframe 220 on the TDD carrier 200 with an uplink control channel subframe on the uplink FDD carrier. According to the association, allocate uplink control channel resources on the uplink FDD carrier to the receiver. Transmit data to be received by the receiver on a downlink FDD carrier and / or a TDD carrier. [Selection diagram] FIG.

Description

  The implementations described herein generally relate to wireless network nodes, methods in wireless network nodes, receivers, and methods in receivers. In particular, a mechanism for enabling HARQ feedback for data provided by aggregation of an FDD carrier and at least one TDD carrier is described herein.

  A user equipment (UE), also known as a receiver, mobile station, wireless terminal, and / or mobile terminal, communicates wirelessly in a wireless communication system, sometimes referred to as a cellular radio system or a wireless communication network. Made possible. Communication takes place between UEs, between a UE and a wired telephone, and / or between a UE and a server, for example via a radio access network (RAN) and possibly one or more core networks. Can be broken. Wireless communication may include various communication services such as voice, messaging, packet data, video, broadcast, and so on.

  The UE / receiver may further be referred to as a mobile phone, cellular phone, computer tablet, laptop with wireless capability, or the like. A UE in the context of the present invention is portable, pocketable, capable of transmitting voice and / or data over a radio access network with another entity, for example another UE or server. , Handheld, computer-mounted, or in-vehicle mobile devices.

  A wireless communication system covers a geographical area divided into several cell areas, each cell area being a radio network node, or a base station, eg, a radio base station (RBS) or base transceiver station (BTS) service. These may be referred to as “eNB”, “eNodeB”, “NodeB”, or “B-node” in some networks, depending on the technology and / or terminology used.

  Sometimes the expression “cell” may be used to represent the radio network node itself. However, a cell can also be used as a general term in a geographical area where radio coverage is provided by a radio network node at a base station site. One radio network node located at the base station site can serve one or more cells. Radio network nodes can communicate over UEs that are within range of each radio network node over an air interface that operates at radio frequencies.

  In some radio access networks, some radio network nodes may be connected to a radio network controller (RNC), for example in a universal mobile communication system (UMTS), for example by terrestrial communication lines or microwaves. For example, an RNC in GSM, sometimes referred to as a base station controller (BSC), can monitor and coordinate various activities of multiple radio network nodes connected to it. GSM is an abbreviation for Global System for Mobile Communications (original language: Group Special Mobile).

  In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) / LTE Advanced, a radio network node, which may be referred to as an eNodeB or eNB, connects to a gateway, eg, a radio access gateway, to one or more core networks Can be done.

  In the context of the present invention, the downlink (DL), downstream link, or forward link may be used for the transmission path from the radio network node to the UE. The uplink (UL), upstream link, or reverse link may be used for the transmission path in the opposite direction, ie, from the UE to the radio network node.

  Further, when communicating in a wireless communication system to divide a communication channel into the forward and reverse directions on the same physical communication medium, for example, frequency division duplex (FDD) and / or time division duplex ( Duplex methods such as TDD) may be applied. The FDD scheme is used on frequency bands that are sufficiently separated to avoid interference between uplink and downlink transmissions. In TDD, uplink and downlink traffic are transmitted in the same frequency band, but at different time intervals. Thus, uplink and downlink traffic are transmitted separated from each other in the time dimension in TDD transmission, possibly with a guard period (GP) between uplink transmission and downlink transmission. To avoid interference between uplink and downlink, for radio network nodes and / or UEs in the same area, uplink and downlink transmissions between radio network nodes and UEs in different cells are: It can be aligned using synchronization to a common time reference and by using the same allocation of resources for the uplink and downlink.

  Prior art LTE advanced systems support carrier aggregation, and communication between the radio network node (eNodeB) and the UE is facilitated by the simultaneous use of multiple component carriers in the downlink and / or uplink. The The component carriers can be arranged continuously or discontinuously with respect to frequency within a certain frequency band, or even within different frequency bands. Thus, carrier aggregation improves spectrum utilization for network operators and allows higher data rates to be provided. Although carrier aggregation is defined for both FDD and TDD, UEs of prior art systems do not operate simultaneously on FDD and TDD carriers, and therefore there is no carrier aggregation that utilizes carriers in different duplex methods . However, since network operators may have both FDD and TDD carriers, it is desirable to extend this principle to carrier aggregation of FDD and TDD carriers.

  Modern wireless systems such as 3GPP LTE utilize packet-based transmission. After receiving the data packet, the UE sends a hybrid automatic repeat request (HARQ) message to the radio network node. These messages may include, for example, an acknowledgment (ACK) or a negative acknowledgment (NACK). A new packet transmission or packet retransmission can then be initialized by the transmitter after HARQ feedback is obtained. HARQ feedback signaling requires uplink transmission resources, and unused uplink resources can be utilized, for example, to transmit user data instead, thus minimizing the amount of time frequency resources to be allocated for HARQ feedback. It is essential to do. A further problem is to allocate a set of uplink resources to ensure that there are no uplink resource conflicts, i.e. each receiver / UE must be assigned a unique set of uplink resources for HARQ. It is a point that does not become.

  HARQ feedback may be sent to the physical downlink shared channel (PDSCH) scheduled by the physical downlink control channel (PDCCH) / enhanced PDCCH (EPDCCH), semi-persistent scheduling (SPS) PDSCH, or PDCCH / EPDCCH indicating SPS release. In response, it is sent in UL. Three feedback states, ACK, NACK, and discontinuous transmission (DTX) may be used. Sometimes NACK can be merged with DTX into a combined state NACK / DTX. In that case, the radio network node cannot distinguish between NACK and DTX, and if there is a scheduled PDSCH, it needs to perform retransmission. This also makes it impossible to use incremental redundancy for retransmissions. DTX refers to intermittent transmission that occurs when the UE does not receive the PDSCH, for example, fails to receive the transmitted PDCCH / EPDCCH, or when there is no transmitted PDCCH / EPDCCH or PDSCH.

  Thus, when applying FDD, the same number of uplink and downlink subframes are available in the radio frame, but it is provided that HARQ feedback is provided in the uplink subframe for each received downlink subframe. And vice versa. In other words, all downlink subframes may be associated with a particular subsequent uplink subframe for feedback generation, but this association is one-to-one, i.e. for each uplink subframe. , Exactly one downlink subframe is allocated. However, in TDD, the number of uplink and downlink subframes may be different in some configurations, including more downlink subframes than uplink subframes, eg, as shown in FIG. 1A. .

  In general, since a data packet (for example, a transport block in LTE) is transmitted in one subframe, in TDD, one HARQ message is associated with each downlink subframe. This may require that HARQ messages from multiple downlink subframes be transmitted in a single uplink subframe, which allocates multiple unique uplink resources for HARQ. Imply that you need it. For example, in such a scenario that includes 4 downlink subframes for each uplink subframe, the receiver may receive 4 in one single uplink subframe, as shown in FIG. 1B. HARQ feedback for all two downlink subframes must be provided. In doing so, HARQ feedback may occupy a significant amount of uplink communication resources. Thus, especially for TDD, it is essential that the network node can perform efficient uplink resource allocation when the uplink subframe can contain HARQ messages from multiple subframes for many users. . This is especially important when there are fewer uplink subframes in the radio frame than downlink subframes, since the amount of reserved uplink control channel resources affects the available resources for data transmission. .

  For example, in some access technologies, such as LTE Advanced, carrier aggregation may be performed by reception / transmission on a set of serving cells, where the serving cell includes at least one DL component carrier and possibly UL component. Have a career. Here, the concept of a cell cannot refer to a geometric area, but rather should be regarded as a logical concept. The UE is always configured to include a primary serving cell (PCell) and in addition to a secondary serving cell (SCell). The physical uplink control channel (PUCCH) is always transmitted on the PCell.

  Regarding carrier aggregation, one major issue is related to uplink feedback. For downlink carrier aggregation, the UE provides HARQ feedback on the PUCCH transmitted on the primary cell, including ACK and NACK messages corresponding to received transport blocks in the downlink. For spatial multiplexing techniques, up to two transport blocks can be transmitted in downlink subframes on component carriers. For FDD, each downlink subframe may be associated with one unique uplink subframe and a PUCCH is transmitted. For TDD, the number of downlink subframes may be greater than the number of uplink subframes, and thus several downlink subframes may be associated with one unique uplink subframe. Thus, the uplink subframe may need to carry HARQ information corresponding to multiple downlink subframes on the PUCCH in TDD.

  Therefore, allocating uplink transmission resources for HARQ feedback in TDD and FDD carrier aggregation is a problem and the resources are unique to different subframes while minimizing the overlay of the uplink resources.

  There are several PUCCH signaling formats that can carry HARQ feedback in LTE Advanced. One type of PUCCH format utilizes a four-phase phase shift keying (QPSK) or two-phase phase shift keying (BPSK) modulation sequence, ie, format 1a / 1b. When extended with selection from multiple (up to 4) sequences (ie, format 1b with channel selection), 4 HARQ-ACK bits may be conveyed. These formats are used both with and without carrier aggregation and can provide HARQ feedback for up to two component carriers, which actually takes into account the complexity of the UE This is the most practical case. Another type of PUCCH format is DFT spread OFDM (ie, format 3) that can carry more HARQ feedback (eg, 20 HARQ-ACK bits). A UE is configured by a radio network node regardless of whether it can use a PUCCH format 3 or PUCCH format 1b based scheme. However, PUCCH format 3 may not be necessary when only two component carriers are aggregated.

  For TDD, the frame structure is in addition to normal subframes, a first part for downlink transmission, a second part for downlink pilot time slot (DwPTS), a second part for guard period (GP), and for uplink transmission. The last part comprises a special subframe including an uplink pilot time slot (UpPTS), see FIG. 1C for this. The duration of the different parts may vary and may be configurable by the system.

  The downlink subframe is shown in FIG. 1D, and the uplink subframe is shown in FIG. 1E.

  Thus, in TDD, M = 1, 2, 3, or 4 downlink subframes may be associated with an uplink subframe. In order to aggregate two component carriers by performing spatial multiplexing on each carrier, up to 4 * 2 * 2 = 16 HARQ-ACK bits can be in one subframe, which is the channel selection It cannot be supported by using a certain PUCCH format 1b. Accordingly, various forms of HARQ information compression techniques are used to reduce the number of HARQ-ACK bits. For example, a logical AND operation between HARQ and ACK bits is performed between transport blocks in a subframe (spatial bundling), across subframes (time domain bundling), or across component carriers. Can be executed. The drawback is that the bundled NACK implies that retransmissions must be performed for all transport blocks in the bundle. Therefore, as a result, throughput is lowered and spectral efficiency is also lowered. Bundling is mainly a problem for TDD, because FDD requires at most 4 HARQ-ACK bits to be accepted (assuming 2 component carriers with spatial multiplexing). This can be handled in format 1b with channel selection without bundling.

  For TDD, the component carrier is configured with one of seven UL-DL configurations and defines the transmission direction of subframes within the radio frame. The radio frame includes a downlink subframe, an uplink subframe, and a special subframe. The special subframe includes one part for downlink transmission, a guard period, and one part for uplink transmission. The number M of downlink subframes in which the uplink subframe can transmit HARQ feedback depends on the TDD UL-DL configuration and also the index of the specific uplink subframe. In fact, the same UL-DL configuration must be used in neighboring cells to avoid UE-UE and eNodeB-eNodeB interference. Thus, for example, it is not easy to reconfigure the UL-DL configuration to accommodate traffic loads. However, LTE Advanced allows the possibility of dynamically changing the subframe direction. This can be represented as a flexible subframe. For example, a UE capable of such dynamic subframe direction change may be given an instruction to use a subframe for downlink transmission even in an uplink subframe with a cell-specific UL-DL configuration. If the uplink subframe is used as a flexible subframe for downlink transmission, there is no associated uplink subframe for the corresponding HARQ information according to the cell-specific UL-DL configuration, and such UEs It may follow different HARQ timing (eg, of another reference TDD UL-DL configuration) than a given UL-DL configuration.

  The PDCCH / EPDCCH includes downlink control information (DCI) related to PDSCH transmission. This includes, for example, the HARQ process number (3 bits for FDD and 4 bits for TDD). For TDD, there is also a 2-bit downlink assignment index (DAI). For DCI including downlink assignment, DAI determines the cumulative number of PDCCH / EPDCCH with assigned PDSCH transmission (s) and PDCCH / EPDCCH indicating SPS release up to the current subframe of the bundling window. Acts as an incremental counter to represent. For DCI including uplink grants, DAI indicates the total number of subframes with PDSCH (s) and PDCCH / EPDCCH indicating SPS release transmitted in the bundling window of M downlink subframes. . With DAI information, the UE detects whether it failed to receive PDSCH or PDCCH / EPDCCH (except for the last one) and whether it could send a correspondingly bundled ACK or NACK It may be possible.

  In PUCCH format 1b with channel selection, a set of channels (ie, sequences, or PUCCH resources) is reserved for the UE and is then modulated with QPSK symbols as a means of encoding HARQ messages. Assume that one is selected. Given that up to four channels are reserved, at most four HARQ-ACK bits (ie, 16 unique states of HARQ information) may be provided. PUCCH resource reservation may be performed implicitly by mapping from time frequency resources occupied by PDCCH / EPDCCH to PUCCH resources. Implicit resource reservation is used when the PDCCH / EPDCCH is placed on the PCell, and the PDSCH is scheduled either on the PCell or on the SCell by so-called cross-carrier scheduling. Explicit resource reservation is used when PDCCH / EPDCCH is arranged on SCell, or for SPS transmission of PDSCH on PCell without PDCCH / EPDCCH. For explicit resource reservation, 2 bits in PDCCH / EPDCCH indicate 1 or 2 higher layer configured resources that can be reserved. These 2 bits are obtained by reusing 2 bits of the transmission power control (TPC) field related to PUCCH. As a result, TPC commands cannot be signaled in DCI when PDCCH / EPDCCH is transmitted on SCell.

  For TDD, if only 4 HARQ-ACK bits (ie 16 HARQ states) can be transmitted, all of ACK, NACK, and DTC states for 2 component carriers when M> 1 It is not possible to represent a combination. Therefore, spatial bundling is used when M> 1. However, when M> 2, spatial bundling is not sufficient and a form of time domain bundling is also performed, giving separate tables for M = 3 and M = 4. Time domain bundling in this case corresponds to prioritizing HARQ states representing subframes with consecutive ACKs and associating such states with unique channel and modulation combinations.

  On the uplink, the UE may also send a scheduling request (SR) when it has uplink data to send. The SR may be provided on a higher layer configured channel (ie, sequence or PUCCH resource). Assuming QPSK modulation, at most two bits may be conveyed on the SR resource. If the UE is supposed to send HARQ information along with SR, channel selection cannot be performed and the HARQ-ACK bits are bundled so that at most two bundled bits remain. The This eventually results in selecting only the modulation symbol (ie QPSK symbol representing 2 bits) and transmitting it on the allocated SR resource. For FDD this is facilitated by spatial bundling. Further, spatial bundling is always performed such that only one HARQ-ACK bit is transmitted per serving cell even though two non-bundling HARQ-ACK bits can be transmitted. That is, even if there is no transmission on the SCell (PCell), spatial bundling is performed on the HARQ-ACK bits on the PCell (SCell). This avoids the case where the radio network node performed the transmission (and therefore expects bundled HARQ information) even though the UE messed up the transmission. For TDD, bundling includes feeding back the number of ACKs between all transport blocks, subframes, and component carriers. However, this bundling mapping is not unique because ten such states are associated with only two HARQ-ACK bits being bundled. Therefore, the radio network node cannot easily determine a correctly received transmission and the possibility for retransmission of all transport blocks cannot be ignored.

  In order to minimize complexity at the UE, it is beneficial to support downlink carrier aggregation of one FDD carrier and one TDD carrier using HARQ feedback with format 1b with channel selection. Current HARQ feedback with PUCCH format 1b with channel selection for TDD involves significant HARQ bundling to be avoided, especially to avoid introducing bundling for FDD carriers in the combined feedback method.

  The problem is to define a method for simultaneous combined HARQ feedback for FDD and TDD carriers.

  A further problem is to reduce the amount of bundling when a scheduling request (SR) is transmitted with HARQ information. Therefore, it is a common problem to ensure that there is a reasonable trade-off between control channel overhead and performance.

  The aim is therefore to remove at least some of the above disadvantages and to improve the performance in wireless communication systems.

  This and other objects are achieved by the features of the attached independent claims. Further implementations are apparent from the dependent claims, the description and the figures.

  According to a first aspect, a method for data transmission and allocation of uplink control channel resources in an uplink frequency division duplex (FDD) carrier is provided at a radio network node, where a receiver is a downlink FDD. It is possible to provide hybrid automatic repeat request (HARQ) feedback for data transmitted on the downlink using carrier aggregation of the carrier and at least one time division duplex (TDD) carrier, the method comprising: Associating each downlink subframe on the FDD carrier with an uplink control channel subframe on the uplink FDD carrier. The method also includes associating each downlink subframe and special subframe on the TDD carrier with an uplink control channel subframe on the uplink FDD carrier. In addition, the method also includes allocating uplink control channel resources on the uplink FDD carrier to the receiver according to the association made. Further, the method also includes transmitting data to be received by a receiver on the downlink FDD carrier and / or TDD carrier.

  In a first possible implementation of the method according to the first aspect, each downlink subframe and special subframe on the TDD carrier is associated with an uplink control channel subframe on the uplink FDD carrier in a one-to-one relationship.

  In a second possible implementation of the method according to the first aspect, each downlink subframe and special subframe on the TDD carrier is associated in a many-to-one relationship with the uplink control channel subframe on the uplink FDD carrier.

  In a third possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the receiver provides HARQ feedback by selection of a sequence and modulation symbols or selection of modulation symbols And it may be possible to form a HARQ message in the uplink subframe of the uplink FDD carrier.

  In a fourth possible implementation of the method according to the first aspect, or prior possible implementation of the method according to the first aspect, the association mapping from HARQ information to modulation symbols and / or sequences is a method of carrier duplexing It may be independent of

  In a fifth possible implementation of the method according to the first aspect or a previous possible implementation of the method according to the first aspect, the association of each downlink subframe on the downlink FDD carrier and each downlink subframe on the TDD carrier And the association of the special subframe and the uplink control channel subframe in the uplink FDD carrier may generate at least one uplink subframe in the uplink FDD carrier that includes only HARQ feedback related to the downlink FDD carrier.

  In a sixth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the HARQ feedback for downlink subframe n is up in uplink FDD carrier number n + offset value k. It may be transmitted on a link control channel subframe.

  In a seventh possible implementation of the method according to the sixth possible implementation of the method according to the first aspect, the offset value k may be set to 4.

  In an eighth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the carrier aggregation includes one downlink FDD carrier and two TDD carriers, The total number of downlink subframes and special subframes of the TDD carrier does not exceed the total number of uplink subframes in the uplink FDD carrier for each radio frame.

  In a ninth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the association mapping from HARQ information to modulation symbols and sequences for the FDD carrier and the TDD carrier is the FDD carrier. And / or may be based on FDD and / or TDD HARQ-ACK procedures specified in the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Advanced Standard 3GPP TS 36.213 for TDD carriers.

  In a tenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the HARQ information is transmitted on a scheduling request resource in the uplink of the uplink FDD carrier. Spatial bundling may be performed in the uplink subframe allocated for HARQ feedback of both downlink FDD carrier and TDD carrier, and spatial bundling may be performed for HARQ feedback of downlink FDD carrier. Cannot be performed in the assigned uplink subframe.

  In an eleventh possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the types of uplink subframes on the uplink FDD carrier are: Or it may be determined by the downlink control channel.

  In a twelfth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, an offset value k for providing HARQ feedback for an uplink subframe on the uplink FDD carrier. May be determined from higher layer configured entities or by a downlink control channel.

  In a thirteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the HARQ feedback for the uplink subframe on the uplink FDD carrier is a spatial subframe for the TDD carrier. It cannot be related to bundling.

  In a fourteenth possible implementation of the method according to the first aspect, or in a previous possible implementation of the method according to the first aspect, the sub in the TDD carrier associated with the uplink control channel sub-frame in the uplink FDD carrier. The frame may be determined from higher layer configured entities or by a downlink control channel.

  In a fifteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the downlink control information (DCI) in the downlink control channel associated with the TDD carrier is: It may not include a downlink assignment index (DAI).

  In a sixteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the DCI in the downlink control channel of the TDD carrier includes bits having a predefined value. obtain.

  In a seventeenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the DCI in the downlink control channel of the TDD carrier may include bits dedicated to transmit power control.

  In an eighteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the HARQ feedback related to the transmission data is in an uplink FDD carrier assigned to the receiver It may be received from a receiver on uplink control channel resources.

  In a nineteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, the radio network node may include an enhanced NodeB in the (LTE) system and the receiver May include user equipment (UE), the downlink subframe may include a physical downlink shared channel (PDSCH) in a downlink FDD carrier, and the downlink subframe may be a physical downlink in a TDD carrier. The shared channel (PDSCH) may be included, and the uplink control channel subframe may include a physical uplink control channel (PUCCH) in the uplink FDD carrier.

  In a second aspect, a radio network node is provided for data transmission and allocation of uplink control channel resources in a downlink FDD carrier, whereby the receiver is a downlink FDD carrier and a carrier of at least one TDD carrier. It is possible to provide HARQ feedback for data transmitted on the downlink using aggregation. The radio network node includes a processor configured to associate each downlink subframe on the downlink FDD carrier with an uplink control channel subframe on the uplink FDD carrier, and each downlink subframe on the TDD carrier. The frame and the special subframe are also configured to be associated with the uplink control channel subframe on the uplink FDD carrier, and further, according to the association made, allocate uplink control channel resources on the uplink FDD carrier to the receiver. Composed. Further, the radio network node comprises a transmitter configured to transmit data to be received by a receiver on the downlink FDD carrier and / or TDD carrier.

  In a first possible implementation of the second aspect, the processor is further configured to associate each downlink subframe and special subframe on the TDD carrier with an uplink control channel subframe on the uplink FDD carrier in a one-to-one relationship. Can be configured.

  In a second possible implementation of the second aspect, the processor may associate each downlink subframe and special subframe on the TDD carrier with an uplink control channel subframe on the uplink FDD carrier in a many-to-one relationship. It can be further configured.

  In a third possible implementation of the second aspect, or a previous possible implementation of the second aspect, the radio network node may also be on uplink control channel resources in an uplink FDD carrier assigned to the receiver. A receiver configured to receive HARQ feedback related to the transmitted data from the receiver.

  According to a third aspect, an uplink control channel resource in an uplink FDD carrier provides HARQ feedback for data received on the downlink using carrier aggregation of the downlink FDD carrier and at least one TDD carrier A method is provided at a receiver for receiving data in a subframe on a downlink data channel of a downlink FDD carrier and / or in a downlink subframe on a downlink data channel of a TDD carrier. Including doing. The method also includes determining whether the data has been received correctly. In addition, this method selects the sequence and modulation symbols, or selects the modulation symbols, and ACK is determined for data that has been determined to be correctly received, not correctly received. Forming a HARQ message corresponding to NACK for data and / or DTX for no data received in the uplink subframe of the uplink FDD carrier, and the selected sequence And transmit HARQ feedback related to the received data, including modulation symbols or selected modulation symbols in HARQ messages, on uplink control channel resources on the uplink FDD carrier assigned to the receiver In addition.

  In a first possible implementation of the third aspect, HARQ feedback is provided by sequence and modulation symbol selection, or modulation symbol selection, forming a HARQ message in the uplink subframe of the uplink FDD carrier.

  In the second possible implementation of the third aspect, or the previous implementation of the third aspect, the association mapping from HARQ information to sequences and modulation symbols may be independent of the method of carrier duplexing. .

  In a third possible implementation of the third aspect, or a previous implementation of the third aspect, the carrier aggregation may include one downlink FDD carrier and two TDD carriers, a downlink subframe and The total number of special subframes cannot exceed the total number of uplink subframes in the uplink FDD carrier for each radio frame.

  In a fourth possible implementation of the third aspect, or a previous implementation of the third aspect, the association mapping from HARQ information to modulation symbols and sequences for FDD carrier and TDD carrier is for FDD carrier and / or TDD carrier. It may be based on the FDD and / or TDD HARQ-ACK procedure specified in 3GPP LTE Advanced Standard 3GPP TS 36.213.

  In a fifth possible implementation of the third aspect, or a previous implementation of the third aspect, the HARQ feedback may be transmitted on a scheduling request resource in the uplink of the uplink FDD carrier, and spatial bundling May be performed in the uplink subframe allocated for HARQ feedback of both the downlink FDD carrier and the TDD carrier, and spatial bundling is the uplink allocated for HARQ feedback of the downlink FDD carrier. It cannot be executed within a link subframe.

  In a sixth possible implementation of the third aspect, or a previous implementation of the third aspect, the type of uplink subframe on the uplink FDD carrier may be from an upper layer configured entity or by a downlink control channel Can be determined.

  In a seventh possible implementation of the third aspect, or a previous implementation of the third aspect, the radio network node may include an enhanced NodeB in the LTE system, and the receiver includes a user equipment (UE). The downlink subframe may include a physical downlink shared channel (PDSCH) on a downlink FDD carrier, and the downlink subframe includes a physical downlink shared channel (PDSCH) on a TDD carrier. The uplink control channel subframe may include a physical uplink control channel, PUCCH in the uplink FDD carrier.

  According to a fourth aspect, an uplink control channel resource in an uplink FDD carrier provides HARQ feedback for data received in the downlink using carrier aggregation of the downlink FDD carrier and at least one TDD carrier A receiver for is realized. The receiver comprises a receiver configured to receive data in a downlink subframe on the downlink data channel of the FDD carrier and / or in a downlink subframe on the downlink data channel of the TDD carrier. . In addition, the receiver comprises a processor configured to determine whether the data has been correctly received and to select a sequence or modulation symbol to determine that the data has been correctly received. Uplink FDD carrier up HARQ message corresponding to ACK, NACK for data determined not received correctly and / or DTX for no data received It is also configured to form within a link subframe. In addition, the receiver may provide uplink FDD assigned to the receiver with HARQ feedback related to the received data, including the selected sequence and modulation symbol, or the selected modulation symbol in the HARQ message. A transmitter configured to transmit on uplink control channel resources in a carrier is provided.

  Thanks to the aspects described herein, it is possible to provide HARQ feedback on data transmitted by carrier aggregation of signals transmitted on the FDD carrier and at least one TDD carrier. By providing HARQ feedback on the uplink FDD carrier, problems associated with TDD HARQ feedback, such as frequent use of bundling, large DCI format, and more frequent transmission of scheduling requests along with HARQ feedback are present. Avoided. Thereby, the amount of bundling is reduced, and thus less data is retransmitted when an error is detected. Thus, performance improvements are provided within the wireless communication system.

  Other objects, advantages, and novel features of aspects of the present invention will become apparent from the following detailed description.

  Various embodiments will be described in more detail with reference to the accompanying drawings.

FIG. 2 is a diagram of a TDD subframe according to the prior art. FIG. 2 is a diagram of a TDD subframe according to the prior art. It is a block diagram which shows the TDD radio frame by a prior art. FIG. 6 is a block diagram illustrating a downlink subframe according to the prior art. FIG. 6 is a block diagram illustrating an uplink subframe according to the prior art. 1 is a block diagram illustrating a wireless communication system according to some embodiments. FIG. FIG. 2 is a block diagram illustrating a radio frame in TDD / FDD according to some embodiments. FIG. 2 is a block diagram illustrating a radio frame in TDD / FDD according to some embodiments. 2 is a flow diagram illustrating a method in a wireless network node according to one embodiment. 1 is a block diagram illustrating a radio network node according to one embodiment. FIG. 3 is a flow diagram illustrating a method in a receiver according to one embodiment. 2 is a block diagram illustrating a receiver according to one embodiment. FIG.

  The embodiments of the present invention described herein are defined as radio network nodes and methods in radio network nodes, receivers and receivers methods that can be implemented in the embodiments described below. However, these embodiments may be illustrated and implemented in many different forms and should not be limited to the examples described herein, but rather are illustrated of these embodiments. Some examples are provided so that this disclosure will be thorough and complete.

  Still other objects and features will become apparent from the following detailed description when considered in conjunction with the accompanying drawings. However, it is understood that the drawings are made solely for purposes of illustration and are not intended as a definition of the limitations of the embodiments disclosed herein, and reference should be made to the appended claims. Should be. Further, the drawings are not necessarily to scale and are intended only to conceptually illustrate the structures and procedures described herein unless otherwise specified.

  FIG. 2 is a schematic diagram of a wireless communication system 100 comprising a radio network node 110 that communicates with a receiver 120 that is serviced by the radio network node 110.

  The wireless communication system 100 may be at least partially, for example, 3GPP LTE, LTE Advanced, Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Universal Mobile Telecommunications System (UMTS), Global System, to name a few examples. For Mobile Communications (original: Group Special Mobile) (GSM) / Enhanced Data Rate for GSM Evolution (GSM / EDGE), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA) network, Frequency Division Multiple Access (FDMA) ) Network, orthogonal FDMA (OFDMA) network, single carrier FDMA (SC-FDMA) network, worldwide interoperability Tfour Microwave Access (WiMax) or Ultra Mobile Broadband (UMB), High Speed Packet Access (HSPA) Advanced Universal Terrestrial Radio Access (E-UTRA), Universal Terrestrial Radio Access (UTRA), GSM EDGE Radio Access Network (GERAN) ) Based on radio access technologies such as 3GPP2 CDMA technologies, eg, CDMA2000 1x RTT, and High Rate Packet Data (HRPD). The expressions “wireless communication network”, “wireless communication system”, and / or “cellular communication system” may be used interchangeably within the technical context of this disclosure.

  The wireless communication system 100 may be configured for carrier aggregation of frequency division duplex (FDD) carriers and at least one time division duplex (TDD) carrier in the downlink according to different embodiments.

  The exemplary purpose of FIG. 2 is a simplified overview of the wireless communication system 100 and the methods and nodes involved, and the functions involved, such as the radio network node 110 and receiver 120 described herein. Is to state. The method and wireless communication system 100 will then be described in a 3GPP LTE / LTE Advanced environment as a non-limiting example, although embodiments of the disclosed method and wireless communication system 100 are already described above, for example. It may be based on other access technologies, such as those listed. Thus, embodiments of the present invention are based on the 3GPP LTE system and can be described using its terminology, but are in no way limited to 3GPP LTE.

  The illustrated wireless communication system 100 includes a radio network node 110 that may transmit radio signals to be received by a receiver 120.

  Note that the illustrated network configuration of one radio network node 110 and one receiver 120 of FIG. 2 should be considered as a non-limiting example of only one embodiment. The wireless communication system 100 may include other numbers of radio network nodes 110 and / or receivers 120, and / or combinations thereof. Thus, multiple configurations of multiple receivers 120 and radio network nodes 110 may be involved in some embodiments of the disclosed invention.

  Thus, a “single (one or a / an in English)” receiver 120 and / or radio network node 110 whenever multiple references are made in the context of the present invention, in accordance with some embodiments. Machine 120 and / or radio network node 110 may be involved.

  The radio network node 110 may be configured for downlink transmission according to some embodiments, eg, depending on the radio access technology and / or terminology used, eg, base station, NodeB, Evolved Node B (eNB or eNodeB), base transceiver station, access point base station, base station router, radio base station (RBS), micro base station, pico base station, femto base station, home eNodeB, sensor, beacon device , A relay node, a repeater, or any other network node configured to communicate with the receiver 120 over a wireless interface.

  The receiver 120 may correspondingly correspond to different embodiments and different terms, for example, user equipment (UE), wireless communication terminal, mobile phone, personal digital assistant (PDA), wireless platform, mobile station, tablet computer, mobile Communicates wirelessly with type communication devices, laptops, computers, wireless terminals acting as relay stations, relay nodes, mobile relay stations, subscriber premises equipment (CPE), fixed wireless access (FWA) nodes, or radio network nodes 110 It may be represented by any other type of device that is configured as such.

  Some embodiments of the present invention define a method for performing HARQ information transmission for carrier aggregation of one FDD carrier and at least one TDD carrier to form a HARQ message by selecting a (QPSK) modulation sequence; Each field in the HARQ message corresponds to one transport block.

  Each downlink subframe and special subframe in the TDD carrier may be associated with the uplink subframe in the FDD carrier in a one-to-one relationship, and HARQ information transmission for the TDD and FDD carriers is supported. However, according to some alternative embodiments, each downlink subframe and special subframe on the TDD carrier may be associated in a many-to-one relationship with an uplink subframe on the FDD carrier, such as TDD and FDD. HARQ information transmission for the carrier is supported.

  Further, the association mapping from HARQ information to modulation symbols and / or sequences may be the same regardless of the carrier subframe and duplex method. In addition, HARQ information is transmitted on the FDD carrier.

  The method may be applicable in some embodiments to carrier aggregation of one FDD carrier and one TDD carrier. The method may also be applicable to carrier aggregation of one FDD carrier and at least two TDD carriers, where the total number of downlink subframes and special subframes of the TDD carrier in a radio frame is The total number of uplink subframes in the FDD carrier is not exceeded.

  The method may be applied within LTE Advanced in some embodiments, and Tables 1, 2, and / or 3 relate HARQ information to modulation symbols and / or sequences for FDD and TDD carriers. Can be used as a mapping.

  The method may be extended for HARQ transmissions on one scheduling request (SR) resource, where the scheduling request is transmitted on an uplink FDD carrier.

  Further, in some embodiments, when transmitting HARQ feedback for a scheduling request resource, spatial bundling is performed in an uplink subframe defined for HARQ feedback of both downlink FDD carrier and TDD carrier. On the other hand, spatial bundling cannot be performed in the uplink subframe defined for HARQ feedback of the uplink FDD carrier.

  The type of uplink subframe on the uplink FDD carrier may be determined from higher layer configured entities, eg, TDD UL-DL configuration or bitmap, or by a downlink control channel according to different embodiments.

  The associated DCI format for the TDD carrier may not utilize DAI, eg, the method when the DAI field is not present may be set to a predefined value in some embodiments, or Used for other purposes such as power control bits.

  FIG. 3 is a schematic diagram of a radio frame in TDD / FDD according to some embodiments. In the illustrated example, two radio frames are shown, each including 10 subframes for TDD uplink / downlink configuration 1. In addition, two radio frames are shown, each including 10 subframes for FDD uplink and downlink configurations.

  The upper part shows the HARQ timing of the TDD carrier 200 in LTE Advanced according to the prior art. The middle and lower portions illustrate the timing at which HARQ can be transmitted on the uplink FDD carrier 300 in an example of the invention and in some embodiments.

  The TDD radio frame on the TDD carrier 200 includes a TDD downlink subframe 210, a TDD special subframe 220, and a TDD uplink subframe 230. Uplink FDD carrier 300 includes uplink subframe 310, while downlink FDD carrier 350 includes downlink subframe 360.

  HARQ feedback signaling for TDD has many problems compared to FDD, where space, component carrier, and time domain bundling are frequently used. This is known as reducing the spectral efficiency of the system because unnecessary data retransmissions can occur. This degradation occurs particularly when the correlation between channels in transmissions where bundled HARQ feedback is applied is low. For example, inter-cell interference and channel fading are completely different between subframes or between component carriers and can cause loss for subframes and carrier bundling. Furthermore, the DCI format is large for TDD. A larger DCI format reduces the coverage of the control channel, thereby reducing the feasible region where carrier aggregation between TDD and FDD can be used. Furthermore, for TDD, there are fewer uplink subframes in the radio frame, which increases the probability that a scheduling request will be transmitted in the uplink subframe that also carries HARQ feedback. However, concatenated transmission of scheduling requests and HARQ feedback relies on a significant amount of HARQ bundling, which degrades performance.

  Therefore, in supporting combined HARQ feedback for FDD and TDD carrier aggregation, it is desirable not to introduce unnecessary bundling (or a larger DCI size) just because one of the carriers uses TDD. Instead, it is understood that in some embodiments it is preferable to incorporate more of the FDD HARQ mechanism, but this does not depend heavily on bundling.

  In order to avoid bundling HARQ information, it may be beneficial to limit the value of M to one subframe for both TDD carrier 200 and downlink FDD carrier 350, so that one component There are at most two HARQ bits per carrier. Accordingly, one particular feature of some embodiments is that each downlink subframe 210 or special subframe 220 on the TDD carrier 200 has a one-to-one correspondence with the uplink subframe 310 on the uplink FDD carrier 300, which includes a PUCCH. It is good to be related by the relationship. Such a one-to-one relationship may be facilitated by sending HARQ feedback for PUCCH in subframe n + k for PDSCH received in subframe n (or PDCCH / EPDCCH indicating SPS release). The offset value k is subframe dependent, i.e. it may depend on n. On the other hand, this may be fixed, for example k = 4, which is the value used for FDD in the prior art. Therefore, this timing may also apply to the TDD carrier 200 and there is always an existing corresponding uplink subframe 310 for the downlink subframe 360 number n, so the PUCCH on the uplink FDD carrier 300 This is possible if is sent. One advantage of using a one-to-one relationship to determine uplink subframes is that the HARQ feedback corresponding to the TDD carrier is distributed over as many subframes as possible in the uplink FDD carrier. Good thing. That is, this avoids concentrating HARQ feedback of multiple subframes of the TDD carrier in a small number of subframes in the uplink FDD carrier. This is beneficial because it makes the PUCCH load more even between subframes and provides robustness against sudden channel impairments such as fading dip and severe time interference variations.

  In one possible embodiment, a one-to-one mapping may be obtained with a predefined value of k. The predefined value may depend on, for example, the subframe index, the TDD UL-DL configuration, and the number of aggregate carriers. In another embodiment, the one-to-one mapping may be obtained by higher layer configuration.

  However, each downlink subframe 210 or special subframe 220 in the TDD carrier 200 may alternatively be associated in a many-to-one relationship with the uplink subframe 310 in the uplink FDD carrier 300, including the PUCCH. Please keep in mind. Accordingly, multiple TDD downlink subframes 210 and / or special subframes 220 may be associated with one uplink subframe 310 in uplink FDD carrier 300 in some alternative embodiments.

  FIG. 3 further shows an example of two TDD radio frames using UL-DL configuration 1, and the upper arrow indicates the HARQ timing of the LTE advanced TDD carrier 200 according to the prior art. In the middle part, each sub-frame 210 and / or special sub-frame 220 in the TDD carrier 200 has the same HARQ timing as the uplink sub-frame 310 in the uplink FDD carrier 300 in the case of the downlink FDD carrier 350 in one-to-one mapping. An example of one embodiment associated with is shown. However, other one-to-one mappings and / or many-to-one mappings may be possible in different embodiments. In the lower part, HARQ timing for the downlink FDD carrier 350 is shown.

  Note from FIG. 3 that there may be several uplink subframes 310 on only one of the uplink FDD carrier 300, ie, the aggregate carrier, which may include only HARQ feedback from the downlink FDD carrier 350. I want to be. This is in contrast to prior art carrier aggregation of FDD carriers, where all uplink subframes in the FDD carrier may include feedback for both FDD carriers.

  Tables 1, 2, and 3 show the mapping in FDD from HARQ state to channel (PUCCH resource) and bit values of QPSK symbols for 2, 3, and 4 HARQ fields, respectively. Table 1 applies to aggregating two component carriers each containing one transport block. Table 2 applies to aggregating two component carriers, where one component carrier includes two transport blocks and one component carrier includes one transport block. Table 3 applies to aggregating two component carriers, each containing two transport blocks. Tables 1, 2, and 3 are configured to show multiple characteristics, without HARQ bundling (ie, each HARQ-ACK field is associated with one transport block), and implicit resource reservation Is supported (ie, implicit resources are not associated with HARQ state in DTX) and channel selection is disabled when there is only PDSCH scheduled on PCell (ie, SCell is in DTX state) (Only one channel is used, ie

）、シグナリングはＰＵＣＣＨフォーマット１ｂに帰着する。 (Outside 1)

) Signaling results in PUCCH format 1b.

表１

Table 1

  Table 1 shows the encoding for transmission of HARQ messages using two channels.

表２

Table 2

  Table 2 shows the encoding for transmission of HARQ messages using three channels.

表３

Table 3

  Table 3 shows the encoding for transmission of HARQ messages using 4 channels.

  An advantage of some embodiments herein is that if Tables 1, 2, and 3 are used for subframes where only HARQ-ACK for FDD carriers should be transmitted, this situation is: This is equivalent to the fact that the HARQ field for the TDD carrier 200 may be (DTX, DTX) for such an uplink subframe. Examining Tables 1, 2, and 3, it can be seen that this results in using PUCCH format 1b (ie, the same fallback operation defined in the FDD system). Therefore, it is an advantage of this method that the HARQ feedback mechanism already implemented in the receiver 120 can be reused for carrier aggregation of FDD and TDD carriers while ensuring the same HARQ feedback performance as already defined. It is.

  Further, it may be appreciated that the following HARQ-ACK mapping table is feasible, and the above encoding is only an example. For example, prior art LTE Advanced systems also include a similar table for TDD systems that may be applicable. In particular, there is a table corresponding to M = 1 that does not include any form of bundling, which may be applicable to carrier aggregation of FDD and TDD carriers.

  Assuming a one-to-one relationship, it is understood that in one embodiment, the use of HARQ feedback bundling can be eliminated by using association mapping for FDD of HARQ states to sequences and modulation symbols for TDD as well. Good thing. In one embodiment, Tables 1, 2, and 3 may be utilized for HARQ feedback, using FDD on one component carrier and TDD on one component carrier. In one example, the FDD carrier may be a PCell. In another example, the FDD carrier may be a SCell. For example, in the embodiment of the present invention, Table 3 is applied, HARQ-ACK (0) and HARQ-ACK (1) are associated with FDD carriers, and HARQ-ACK (2) and HARQ-ACK (3) are associated with TDD carriers. Can be associated. In another example, the invention according to one embodiment applies Table 3 and associates HARQ-ACK (0) and HARQ-ACK (1) to a TDD carrier, and HARQ-ACK (2) and HARQ-ACK (3) Can be associated with the FDD carrier. One skilled in the art can create similar examples from other HARQ mapping tables. Therefore, in one embodiment of the present invention, the association mapping from HARQ information to modulation symbols and / or sequences may be the same regardless of the carrier subframe and duplex method.

  However, in other embodiments, a many-to-one relationship is established between downlink subframe (s) 210 and / or special subframe (s) 220 of TDD carrier 200 to FDD uplink subframe 310. Can be done. Accordingly, HARQ feedback bundling may be utilized in accordance with those embodiments.

  FIG. 4 shows two radio frames (10 subframes each), and TDD UL / DL configuration 0 (top) 200, TDD UL-DL configuration 1 (medium) 250, and TDD UL / DL FDD carriers 300, 350. An example of HARQ timing for carrier aggregation using (lower) is shown.

  Further, some embodiments may be applicable to carrier aggregation of one downlink FDD carrier 350 and multiple TDD carriers 200, 250, in which case all downlink subframes of TDD carrier 200 It can also be appreciated that 210 and special subframe 220 can be linked to a unique FDD uplink subframe 310. This is typically achieved when the total number of TDD carriers 200, 250 downlink subframes 210 and special subframes 220 per radio frame does not exceed the number of FDD uplink subframes 310 per radio frame. Is possible. FIG. 4 shows an example in which one TDD carrier 200 using TDD UL-DL configuration 0 is aggregated with another TDD carrier 250 using TDD UL-DL configuration 1 along with downlink FDD carrier 350. Is shown. This ensures that the uplink subframe 310 includes HARQ-ACK bits from at most two carriers. Thus, for example, Tables 1, 2, and / or 3 can be utilized, i.e. bundling can be completely avoided. This is in contrast to the prior art, where PUCCH format 1b with channel selection only supports the aggregation of two component carriers.

  A further constraint on supporting carrier aggregation with multiple TDD carriers 200, 250 is that the HARQ round trip time delay cannot be reduced from the delay currently in the system. This may impose restrictions on the combination of the number of carriers and their respective TDD UL-DL configurations. For example, in some embodiments, it may be required that k ≧ 4 for subframes 210, 220, 230 of TDD carriers 200, 250.

  A further aspect of the described method includes joint transmission of scheduling requests and HARQ feedback. It may be desirable to avoid bundling operations (space, subframe, component carrier) performed in prior art LTE advanced systems for TDD. HARQ information from downlink FDD carrier 350 in some embodiments, if there is a one-to-one relationship between downlink subframe 210 on TDD carriers 200, 250 and uplink subframe 310 on uplink FDD carrier 300. It is understood that there may be at least one uplink subframe 310 in the uplink FDD carrier 300 that may be defined to include only. However, in other alternative embodiments, there may be a many-to-one relationship between the downlink subframe 210 in the TDD carriers 200, 250 and the uplink subframe 310 in the uplink FDD carrier 300. However, in some such embodiments, there may be at least one uplink subframe 310 in the uplink FDD carrier 300 that may be defined to include only HARQ information from the downlink FDD carrier 350.

  Next, two types of uplink subframes 310 are defined on the uplink FDD carrier 300. Uplink subframe 310 defined for HARQ feedback of both downlink FDD carrier 350 and TDD carriers 200, 250, and uplink subframe defined for HARQ feedback of downlink FDD carrier 350 only There are 310. This embodiment is illustrated in FIG.

  If an uplink subframe is defined for HADD feedback of FDD carrier only, at most two HARQ-ACK bits (assuming transmission of two transport blocks) are signaled along with the scheduling request. Need to be done. If uplink subframes are defined for HARQ feedback for both FDD and TDD carriers, potentially up to 4 HARQ-ACK bits (2 bits per carrier) are combined with the scheduling request. This is not possible without bundling. If there are two such types of uplink subframes, the type of uplink subframe may need to be known to both receiver 120 and radio network node 110 according to some embodiments.

  In one embodiment, the type of uplink subframe may be determined from the TDD UL-DL configuration and designated HARQ timing for each downlink subframe 210 and special subframe 220 of TDD carriers 200, 250.

  Further, in some embodiments, the use of flexible subframes is contemplated. According to those embodiments, the transmission direction, i.e., uplink / downlink, may be configurable / reconfigurable to accommodate, for example, wireless traffic demand at that time. In one embodiment of the present invention, the type of uplink subframe 310 on the uplink FDD carrier 300 may be determined according to an upper layer radio resource control (RRC) signaling entity. This entity may take the form of a reference TDD UL-DL configuration (eg, TDD UL-DL configuration 2 or TDD UL-DL configuration 5), and the type of uplink subframe may be a reference TDD UL-DL configuration, As well as the designated HARQ timing for each downlink subframe 210 and special subframe 220 of TDD carriers 200, 250. In a further example, the RRC entity may include a bitmap, and the entries in this bitmap have associated subframes on the TDD carriers 200, 250 in a one-to-one or many-to-one relationship according to previous embodiments. Indicates whether to be linked to the uplink subframe 310 in the uplink FDD carrier 300. The advantage of this form of signaling may be that higher layer RRC signaling is reliable and therefore there is no ambiguity between the receiver 120 and the radio network node 110 regarding the type of uplink subframe. .

  In another example, the TDD UL-DL configuration may be signaled by a downlink control channel (eg, PDCCH or EPDCCH), which is possible on subframes 210, 220, 230 on TDD carrier 200, 250. Can be used to determine the correct direction. The type of uplink subframe may be determined from the reference TDD UL-DL configuration and designated HARQ timing for each downlink subframe 210 and special subframe 220 of TDD carriers 200, 250. This information may be indicated directly by a field in the downlink control indicator (DCI). Such a DCI field may relate to one or more upper layer configured reference TDD UL-DL configurations or bitmaps. For example, such two bits in DCI correspond to four states. Each such state may correspond to four higher layer configured TDD UL-DL configurations or bitmaps. The advantage of this type of dynamic signaling is that it can further avoid spatial bundling because flexible subframes are only used as downlink subframes as needed, and if there is spatial bundling , The percentage of time that the uplink subframe 310 must be linked on the uplink FDD carrier 300 for HARQ transmission is reduced, and thus, for example, bundling is required for HARQ-ACK feedback on scheduling request resources become.

  One embodiment relates to uplink subframes defined for HARQ feedback of both downlink FDD carrier 350 and TDD carriers 200, 250. The method then includes spatial bundling within the component carrier and transmitting spatially bundled HARQ-ACK bits on the scheduling request resource when spatial multiplexing is used on the carrier. obtain. This reduces the HARQ message to 2 bits (1 bit per serving cell), thus avoiding any form of subframe or component carrier bundling, which is the prior art LTE when HARQ information compression is reduced. This is an advantage over the advanced system and increases system efficiency.

  Another embodiment relates to uplink subframes defined for HARQ feedback of downlink FDD carrier 350 only. In this case, it is understood that at most two HARQ-ACK bits may need to be fed back (assuming spatial multiplexing). However, in contrast to prior art systems, QPSK symbols can carry 2 bits, so there is no need to perform spatial bundling in this case. The method may include transmitting a (non-bundling) HARQ-ACK bit on a scheduling request resource.

  In other embodiments, where subframes (210, 220, 230) on TDD carriers 200, 250 are associated with HARQ feedback for uplink subframe 310 of uplink FDD carrier 300 in a many-to-one relationship. The method may include transmitting a HARQ-ACK bit on the bundled scheduling request resource.

  Further, the PUCCH is transmitted on the FDD carrier and the uplink subframe 310 unique on the uplink FDD carrier 300 for each downlink subframe 210 and special subframe 220 of the TDD carrier 200, 250. (Eg, the HARQ timing of the TDD carrier may be defined by following the FDD carrier), the downlink assignment index (DAI) bit in DCI schedules data on TDD carriers 200, 250 Can not be necessary for. This is understood as each subframe that includes a downlink transmission on the TDD carrier corresponds to one unique subframe on the uplink FDD carrier in those embodiments. In one embodiment, the DCI format related to PDSCH transmission on TDD carriers 200, 250 may not utilize any DAI bits. The presence of the DAI may be predetermined or configured by the radio network node 110. Therefore, it is possible to reduce the DCI size for the TDD carrier, which reduces the signaling overhead in the system and improves the reliability of the control channel, i.e. increases the service area in which carrier aggregation can be performed. .

  In another exemplary embodiment, the DAI bit is used for other purposes. For example, they can be set to predetermined values to serve as additional error detection, ie, virtual cyclic redundancy check (CRC) bits. This improves the reliability of receiving PDCCH / EPDCCH. They can also be used for transmit power control (TPC) commands. This may improve PUCCH power control since in some embodiments, TPC commands may also be issued from the PDCCH / EPDCCH transmitted on the SCell.

  Further, in FDD, the HARQ round trip time is 8 subframes, that is, 8 subframes are required from downlink transmission to transmission / retransmission of the same HARQ process. Thus, 8 HARQ processes are defined for FDD. For TDD, the maximum number of HARQ processes varies from 4 to 15 depending on the UL-DL configuration. This is because in TDD, k ≧ 4 with respect to the HARQ timing. It is an advantage if the HARQ round trip time delay can be minimized since this reduces the response time of the communication system and reduces latency. However, it can be appreciated that smaller values of k can be used compared to those used for TDD in LTE Advanced. As a result, HARQ round trip time may be reduced, which may allow a smaller maximum number of HARQ processes to be used. In that case, the number of bits in the HARQ process number in DCI may be reduced. Similarly, the number of bits may remain the same, but only some of those bits may be used, for example, the most significant bit may be set to a predefined value.

  According to some embodiments, carrier aggregation is performed and component carriers are deployed in different duplex modes for HARQ feedback methods that can convey up to four HARQ-ACK bits.

  FIG. 5 is a flow diagram illustrating an embodiment of a method 500 at the radio network node 110 in the wireless communication system 100. Method 500 performs data transmission and allocation of uplink control channel resources 310 in uplink FDD carrier 300 so that receiver 120 can use downlink FDD carrier 350 and at least one TDD carrier 200 carrier aggregation. The aim is to be able to provide HARQ feedback for data transmitted in the downlink.

  The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on a third generation partnership project Long Term Evolution (3GPP LTE). Further, the wireless communication system 100 may be based on FDD or TDD in different embodiments. Receiver 120 may include user equipment (UE). Downlink subframe 360 may include a physical downlink shared channel (PDSCH) in downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) in TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) in uplink FDD carrier 300.

  The receiver 120 may provide HARQ feedback by selection of the sequence and modulation symbols, or selection of modulation symbols, and may form a HARQ message in the uplink subframe 310 of the uplink FDD carrier 300. HARQ feedback for downlink subframes 210, 360n may be sent on uplink control channel subframe 310 in uplink FDD carrier 300 number n + offset value k. The offset value k may be set to 4 in some embodiments.

  Further, the offset value k for providing HARQ feedback for the uplink subframe 310 on the uplink FDD carrier 300 may be determined from higher layer configured entities or by the downlink control channel.

  Carrier aggregation may include, in some embodiments, one downlink FDD carrier 350 and two TDD carriers 200, 250, downlink subframe 210 and special subframes of two TDD carriers 200, 250. The total number of 220 does not exceed the total number of uplink subframes 310 in the uplink FDD carrier 300 per radio frame.

  The type of uplink subframe 310 on uplink FDD carrier 300 may be determined from higher layer configured entities or by a downlink control channel.

  The downlink control information (DCI) in the downlink control channel associated with the TDD carrier 200 does not include a downlink assignment index (DAI). The DCI in the downlink control channel of TDD carrier 200 may include bits having a predefined value. The DCI in the downlink control channel of TDD carrier 200 may include bits dedicated to transmit power control in some embodiments.

  In order to properly perform uplink control channel data transmission and assignment, method 500 may include a number of actions 501-505.

However, any, some, or all of the described actions 501-505 are performed in a somewhat different time order, executed simultaneously, or different than indicated in the enumeration Note that it may even be performed in a completely reversed order according to an embodiment. Some actions may be performed within the scope of some alternative embodiments, such as action 505, for example. Further, some actions may be performed in a number of alternative manners by different embodiments, and some such alternative manners are within the scope of some, but not necessarily all, embodiments. Note that it can only be performed on. Method 500 may include the following actions.
Action 501

  Each downlink subframe 360 in the downlink FDD carrier 350 is associated with an uplink control channel subframe 310 in the uplink FDD carrier 300.

  The association mapping from HARQ information to modulation symbols and / or sequences is independent of the method of carrier duplexing.

  The one-to-one association between each downlink subframe 360 in downlink FDD carrier 350 and the uplink control channel subframe 310 in uplink FDD carrier 300 is related to downlink FDD carrier 350 in some embodiments. At least one uplink subframe 310 may be generated in the uplink FDD carrier 300 that includes only HARQ feedback.

The association mapping from HARQ information to modulation symbols and sequences for FDD carriers 300, 350 and TDD carrier 200 is, in some embodiments, 3GPP LTE Advanced Standard 3GPP TS 36.213 for FDD carrier 300, 350 and / or TDD carrier 200. Based on the FDD and / or TDD HARQ-ACK procedures specified in
Action 502

  Each downlink subframe 210 and special subframe 220 on the TDD carrier 200 is associated with an uplink control channel subframe 310 on the uplink FDD carrier 300.

  According to some embodiments, each downlink subframe 210 and special subframe 220 in the TDD carrier 200 may be associated with the uplink control channel subframe 310 in the uplink FDD carrier 300 in a one-to-one relationship.

  However, in some alternative embodiments, each downlink subframe 210 and special subframe 220 in TDD carrier 200 is associated with an uplink control channel subframe 310 in uplink FDD carrier 300 in a many-to-one relationship. obtain.

  The association of each downlink subframe 210 and special subframe 220 in TDD carrier 200 with uplink control channel subframe 310 in uplink FDD carrier 300 includes an uplink FDD that includes only HARQ feedback related to downlink FDD carrier 350. At least one uplink subframe 310 on carrier 300 may be generated.

According to some embodiments, the subframes 210, 220, 230 in the TDD carrier 200 are in a one-to-one relationship, or alternatively, in a many-to-one relationship, the uplink control channel in the uplink FDD carrier 300. The subframes 310, 220, 230 on the TDD carrier may be associated with subframe 310, and may be determined from higher layer configured entities or by a downlink control channel.
Action 503

  The uplink control channel resource 310 in the uplink FDD carrier 300 is allocated to the receiver 120 according to the associations 501 and 502 that have been made.

  HARQ information may be transmitted on the scheduling request resource in uplink 310 of uplink FDD carrier 300, and spatial bundling is allocated for HARQ feedback of both downlink FDD carrier 350 and TDD carrier 200. (503) Performed in uplink subframe 310, and spatial bundling is not performed in uplink subframe 310 that is allocated for HARQ feedback of downlink FDD carrier 350 (503).

HARQ feedback for uplink subframe 310 on uplink FDD carrier 300 may not be related to spatial subframe bundling for TDD carrier 200 in some embodiments.
Action 504

Data to be received by the receiver 120 is transmitted on the downlink FDD carrier 350 and / or the TDD carrier 200.
Action 505

  This action may be performed within the scope of some, but not all, embodiments.

  HARQ feedback may be received from receiver 120 related to transmission (504) data on uplink control channel resource 340 in uplink FDD carrier 300 assigned to receiver 120 (503).

  FIG. 6 illustrates one embodiment of a radio network node 110 included in the wireless communication system 100. The radio network node 110 is configured to perform at least some of the previously described method actions 501-505, which may be performed by the uplink control channel resource 310 in the uplink FDD carrier 300. Data transmission and allocation is performed, thereby enabling receiver 120 to provide HARQ feedback for data transmitted on the downlink using downlink FDD carrier 350 and at least one TDD carrier 200 carrier aggregation.

  The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on a third generation partnership project Long Term Evolution (3GPP LTE). Further, the wireless communication system 100 may be based on FDD or TDD in different embodiments. Receiver 120 may include user equipment (UE). Downlink subframe 360 may include a physical downlink shared channel (PDSCH) in downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) in TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) in uplink FDD carrier 300.

  The radio network node 110 includes a processor 620, which is configured to associate each downlink subframe 360 on the downlink FDD carrier 350 with an uplink control channel subframe 310 on the uplink FDD carrier 300, and also for TDD. Each downlink subframe 210 and special subframe 220 in carrier 200 is also configured to be associated with an uplink control channel subframe 310 in uplink FDD carrier 300, and further in uplink FDD carrier 300 according to the association made. An uplink control channel resource 310 is configured to be allocated to the receiver 120.

  Processor 620, in some embodiments, is configured to associate each downlink subframe 210 and special subframe 220 in TDD carrier 200 with uplink control channel subframe 310 in uplink FDD carrier 300 in a one-to-one relationship. Can be done.

  In some alternative embodiments, the processor 620 associates each downlink subframe 210 and special subframe 220 on the TDD carrier 200 with an uplink control channel subframe 310 on the uplink FDD carrier 300 in a many-to-one relationship. Can be configured as follows.

  Such a processor 620 may receive one or more instances of processing circuitry: a central processing unit (CPU), a processing unit, a processing circuit, a processor, an application specific integrated circuit (ASIC), a microprocessor, or instructions. Other processing logic that can be interpreted and executed may be included. Thus, as used herein, the expression “processor” may represent a processing circuit that includes a plurality of processing circuits, such as, for example, any, some, or all of those listed above. .

  However, in some embodiments, the radio network node 110 and / or the processor 620 may comprise an association unit that associates each downlink subframe 360 in the downlink FDD carrier 350 with the uplink FDD carrier 300. In the uplink control channel subframe 310. The association unit may also be configured to associate each downlink subframe 210 and special subframe 220 in the TDD carrier 200 with an uplink control channel subframe 310 in the uplink FDD carrier 300. In addition, in some embodiments, the radio network node 110 and / or the processor 620 may comprise an allocation unit that is up-linked in the uplink FDD carrier 300 according to the associations 501, 502 made. A link control channel resource 310 is configured to be associated with the receiver 120.

  Further, the radio network node 110 comprises a transmitter 630 configured to transmit data to be received by the receiver 120 on the downlink FDD carrier 350 and / or the TDD carrier 200. Transmitter 630 may be configured to transmit a wireless signal to receiver / user equipment 120.

  The radio network node 110 is also configured to receive HARQ feedback related to transmission data from the receiver 120 on the uplink control channel resource 310 in the uplink FDD carrier 300 assigned to the receiver 120. 610 may be provided.

  Such a receiver 610 at the radio network node 110 receives a wireless signal from the receiver / user equipment 120 or any other entity configured to communicate wirelessly over a wireless interface according to some embodiments. Can be configured as follows.

  In addition, according to some embodiments, the radio network node 110 may also include at least one memory 625 in the radio network node 110 in some embodiments. Optional memory 625 may comprise a physical device utilized to store data or programs, ie, instruction sequences, temporarily or permanently. According to some embodiments, the memory 625 may include an integrated circuit comprising silicon-based transistors. Further, the memory 625 can be volatile or non-volatile memory.

  Actions 501-505 to be performed at wireless network node 110 may be implemented through one or more processors 620 at wireless network node 110 along with a computer program product for performing the functions of actions 501-505.

  Thus, the computer program includes program code for performing the method 500 by any of the actions 501-505, and the uplink FDD carrier 300 when the computer program is loaded into the processor 620 in the wireless network node 110. Data transmission and allocation of the uplink control channel resource 310 at, so that the receiver 120 uses HARQ for data transmitted in the downlink using the downlink FDD carrier 350 and the carrier aggregation of at least one TDD carrier 200 Allows to provide feedback.

  The computer program product described above is provided, for example, in the form of a data carrier that carries computer program code for performing at least some of the actions 501-505 according to some embodiments when loaded into the processor 620. obtain. A data carrier is, for example, a hard disk, a CD ROM disk, a memory stick, an optical storage device, a magnetic storage device, or any other such as a disk or tape that can hold machine-readable data in a non-transitory manner. It can be a suitable medium. Furthermore, the computer program product can be provided as computer program code on a server and downloaded to the wireless network node 110, for example, via the Internet or an intranet connection.

  FIG. 7 is a flow diagram illustrating an embodiment of a method 700 at the receiver 120 in the wireless communication system 100. Method 700 may be performed using uplink aggregation channel resource 310 in uplink FDD carrier 300 using carrier aggregation of downlink frequency division duplex (FDD) carrier 350 and at least one time division duplex (TDD) carrier 200. It aims to provide HARQ feedback for data received on the link.

  Receiver 120 may include user equipment (UE). The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on a third generation partnership project Long Term Evolution (3GPP LTE). Further, the wireless communication system 100 may be based on FDD or TDD in different embodiments. Downlink subframe 360 may include a physical downlink shared channel (PDSCH) in downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) in TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) in uplink FDD carrier 300.

  The carrier aggregation may include one downlink FDD carrier 350 and two TDD carriers 200, 250, and the total number of downlink subframes 210 and special subframes 220 is the uplink FDD carrier 300 for each radio frame. Does not exceed the total number of uplink subframes 310 in

  To properly provide HARQ feedback, method 700 may include a number of actions 701-704.

However, any, some, or all of the described actions 701-704 are performed in a somewhat different time order, performed simultaneously, or different than indicated in the enumeration Note that it may even be performed in a completely reversed order according to an embodiment. Further, some actions may be performed in a number of alternative manners by different embodiments, and some such alternative manners are within the scope of some, but not necessarily all, embodiments. Note that it can only be performed on. Method 700 may include the following actions:
Action 701

Data is received in subframe 360 on the downlink data channel of downlink FDD carrier 350 and / or in downlink subframe 210 on the downlink data channel of TDD carrier 200.
Action 702

It is determined whether the data was received correctly (701).
Action 703

  Acknowledgment (ACK) for data (702) determined to be received correctly (701), negative acknowledgment (NACK) for data determined (702) not received correctly (701) ), And / or form a HARQ message corresponding to discontinuous transmission (DTX) for no data received (701) in the uplink subframe 310 of the uplink FDD carrier 300, A sequence and modulation symbol or modulation symbol is selected.

  The association mapping from HARQ information to sequences and modulation symbols may be independent of the carrier duplex method.

The association mapping from HARQ information to modulation symbols and sequences for FDD carriers 300, 350 and TDD carrier 200 is the FDD specified in 3GPP LTE Advanced Standard 3GPP TS 36.213 for FDD carrier 300, 350 and / or TDD carrier 200. / Or based on a TDD HARQ-ACK procedure.
Action 704

  HARQ feedback related to the received (701) data is assigned to the receiver 120, including the selected (703) sequence and modulation symbol, or the selected (703) modulation symbol in the HARQ message. Sent on uplink control channel resource 310 in link FDD carrier 300.

  HARQ feedback may be provided by sequence and modulation symbol selection, or modulation symbol selection, forming a HARQ message in the uplink subframe 310 of the uplink FDD carrier 300.

  HARQ feedback may be sent on a scheduling request resource in uplink 310 of uplink FDD carrier 300 in some embodiments. Spatial bundling may be performed in the uplink subframe assigned for HARQ feedback of both downlink FDD carrier 350 and TDD carrier 200, and spatial bundling may be performed for HARQ feedback of downlink FDD carrier 350. Cannot be performed in the uplink subframe 310 allocated for.

  The type of uplink subframe 310 on the uplink FDD carrier 300 may be determined from higher layer configured entities or by a downlink control channel in some embodiments.

  FIG. 8 illustrates one embodiment of a receiver 120 included in the wireless communication system 100. The receiver 120 performs at least some of the previously described method actions 701-704 with downlink frequency division duplex (FDD) on the uplink control channel resource 310 in the uplink FDD carrier 300. The carrier 350 and at least one time division duplex (TDD) carrier 200 are configured to provide HARQ feedback for data received on the downlink using carrier aggregation.

  Receiver 120 may include user equipment (UE). The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on a third generation partnership project Long Term Evolution (3GPP LTE). Further, the wireless communication system 100 may be based on FDD or TDD in different embodiments. Downlink subframe 360 may include a physical downlink shared channel (PDSCH) in downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) in TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) in uplink FDD carrier 300.

  Receiver 120 is configured to receive data in downlink subframe 360 on the downlink data channel of FDD carrier 350 and / or in downlink subframe 210 on the downlink data channel of TDD carrier 200. A receiver 810.

  The receiver 120 also includes a processor 820 that is configured to determine whether the data has been correctly received, and that has selected a sequence or modulation symbol to determine that the data has been correctly received. Acknowledgment (ACK) for data, negative acknowledgment (NACK) for data determined not to be received correctly, and / or intermittent transmission (DTX) for no data received , Corresponding HARQ messages are also formed in the uplink subframe 310 of the uplink FDD carrier 300.

  Such a processor 820 may receive one or more instances of processing circuitry: a central processing unit (CPU), a processing unit, a processing circuit, a processor, an application specific integration (ASIC), a microprocessor, or instructions. Other processing logic that can be interpreted and executed may be included. Thus, as used herein, the expression “processor” may represent a processing circuit that includes a plurality of processing circuits, such as, for example, any, some, or all of those listed above. .

  In some alternative embodiments, the receiver 120 and / or the processor 820 may comprise a decision unit that, in some embodiments, may determine whether data has been received correctly. Composed. Further, receiver 120 and / or processor 820 may also comprise a selection unit that selects a sequence and modulation symbols or selects a modulation symbol and is determined to have been received correctly. Acknowledgment (ACK) for data, negative acknowledgment (NACK) for data determined not received correctly, and / or intermittent transmission (DTX) for no data received ), In the uplink subframe 310 of the uplink FDD carrier 300.

  In addition, receiver 120 also includes a transmitter 830 that assigns HARQ feedback related to received data, including selected sequences and modulation symbols, or selected modulation symbols in a HARQ message, to receiver 120. Configured to transmit on the uplink control channel resource 310 in the uplink FDD carrier 300 being configured.

In addition, the receiver 120 may also include at least one memory 825 in the receiver 120 in some embodiments. The optional memory 825 may comprise a physical device utilized to store data or programs, ie instruction sequences, temporarily or permanently. According to some embodiments, the memory 825 can include an integrated circuit comprising silicon-based transistors. Further, the memory 825 can be volatile or non-volatile memory.

  Actions 701-704 to be performed at receiver 120 may be implemented through one or more processors 820 at receiver 120 along with a computer program product for performing the functions of actions 701-704.

  Thus, the computer program includes program code for performing method 700 by any of actions 701-704, and when the computer program is loaded into processor 820 in receiver 120, downlink FDD carrier 350 and HARQ feedback for data transmitted on the downlink using carrier aggregation of at least one TDD carrier 200 is provided.

  The computer program product described above is provided, for example, in the form of a data carrier that carries computer program code for performing at least some of actions 701-704 according to some embodiments when loaded into processor 820. obtain. A data carrier is, for example, a hard disk, a CD ROM disk, a memory stick, an optical storage device, a magnetic storage device, or any other such as a disk or tape that can hold machine-readable data in a non-transitory manner. It can be a suitable medium. Further, the computer program product can be provided as computer program code on a server and downloaded to the receiver 120 via, for example, the Internet or an intranet connection.

  The terminology used in describing the embodiments as illustrated in the accompanying drawings is not intended to limit the described methods 500, 700, radio network node 110, and / or receiver 120. . Various changes, substitutions and / or modifications may be made without departing from the invention as defined in the appended claims.

  As used herein, the phrase “and / or” includes any and all combinations of one or more of the associated listed items. In addition, the singular forms “one” (“a”, “an” in English) and “the (“ the ”in English”) should be interpreted as “at least one”. Thus, unless indicated otherwise, in some cases also includes multiple entities of the same type. Further, the phrases “including”, “comprising”, “including”, and / or “comprising” refer to the presence of the described feature, action, integer, step, operation, element, and / or component. It will also be understood that it does not exclude the presence or addition of one or more other features, actions, integers, steps, operations, elements, components, and / or groups thereof. For example, a single unit such as a processor may perform the functions of several items recited in the claims. The mere fact that certain measurements are recited in mutually different dependent claims does not indicate that a combination of these measurements cannot be used to advantage. The computer program may be stored / distributed on a suitable medium, such as an optical storage medium or a semiconductor medium supplied with or as part of other hardware, but via the Internet or other wired or wireless communication system, etc. It may be distributed in other forms.

Claims (37)

A method for data transmission and uplink control channel resource allocation for hybrid automatic repeat request (HARQ) feedback comprising:
Associating each downlink subframe for transmitting data on a downlink frequency division duplex (FDD) carrier with an uplink control channel subframe in the uplink FDD carrier;
Associating each downlink subframe and each special subframe for transmitting data on a time division duplex (TDD) carrier with an uplink control channel subframe in the uplink FDD carrier;
Transmitting data to a receiver on at least one of the downlink FDD carrier and the TDD carrier;
Receiving HARQ feedback from a receiver associated with the transmitted data in an uplink control channel subframe in the uplink FDD carrier;
Including a method.   The method of claim 1, wherein the HARQ feedback is received on a scheduling request resource of the uplink control channel subframe in the uplink FDD carrier.   Spatial bundling is performed in the uplink control channel subframe for HARQ feedback of both the downlink FDD carrier and the TDD carrier, and spatial bundling is performed for HARQ feedback of the downlink FDD carrier. The method according to claim 1 or 2, wherein the method is not performed in the uplink control channel subframe.   Associating each downlink subframe in the downlink FDD carrier with an uplink control channel subframe in the uplink FDD carrier and each downlink subframe and each special subframe in the TDD carrier and the uplink FDD The association with an uplink control channel subframe in a carrier generates at least one uplink control channel subframe in the uplink FDD carrier that includes only HARQ feedback associated with the downlink FDD carrier. The method in any one of thru | or 3.   Each downlink subframe and each special subframe of the TDD carrier is associated with an uplink control channel subframe of the uplink FDD carrier in a one-to-one manner or a many-to-one manner. The method described in the paragraph.   HARQ feedback for the nth downlink subframe is received on the (n + k) th uplink control channel subframe of the uplink FDD carrier, where k is an offset value and n and k are positive 6. A method according to any one of the preceding claims, wherein the method is an integer.   The method of claim 6, wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel. A radio network node for data transmission and allocation of uplink control channel resources for hybrid automatic repeat request (HARQ) feedback, the radio network node comprising:
A memory for storing program instructions;
A processor coupled to the memory;
Including
When executed by the processor, the instructions are sent to the radio network node,
Associating each downlink subframe for transmitting data in a downlink frequency division duplex (FDD) carrier with an uplink control channel subframe in the uplink FDD carrier;
Associating each downlink subframe and each special subframe for data transmission in a time division duplex (TDD) carrier with an uplink control channel subframe in the uplink FDD carrier;
Transmitting data to a receiver on at least one of the downlink FDD carrier and the TDD carrier;
A radio network node operative to receive HARQ feedback from the receiver associated with the transmitted data in an uplink control channel subframe in the uplink FDD carrier.   The radio network node according to claim 8, wherein the HARQ feedback is received on a scheduling request resource of the uplink control channel subframe in the uplink FDD carrier.   Spatial bundling is performed in the uplink control channel subframe for HARQ feedback of both the downlink FDD carrier and the TDD carrier, and spatial bundling is performed for HARQ feedback of the downlink FDD carrier. The radio network node according to claim 8 or 9, which is not executed in the uplink control channel subframe.   Associating each downlink subframe in the downlink FDD carrier with an uplink control channel subframe in the uplink FDD carrier and each downlink subframe and each special subframe in the TDD carrier and the uplink FDD The association with an uplink control channel subframe in a carrier generates at least one uplink control channel subframe in the uplink FDD carrier that includes only HARQ feedback associated with the downlink FDD carrier. The wireless network node according to any one of 1 to 10.   The downlink subframe and the special subframe of the TDD carrier are associated with the uplink control channel subframe of the uplink FDD carrier in a one-to-one manner or a many-to-one manner. The wireless network node according to claim 1.   HARQ feedback for the nth downlink subframe is received on the (n + k) th uplink control channel subframe in the uplink FDD carrier, where k is an offset value, and n and k are The radio network node according to claim 8, wherein the radio network node is a positive integer.   The radio network node according to claim 13, wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel. A method for providing a hybrid automatic repeat request (HARQ) in an uplink control channel subframe in an uplink frequency division duplex (FDD) carrier comprising:
Receiving data carried in either or both of a subframe on a downlink data channel of a downlink FDD carrier and a downlink subframe on a downlink data channel of a time division duplex (TDD) carrier;
Determining whether the data was received correctly;
Generating HARQ feedback indicating that the data was received correctly;
Transmitting the HARQ feedback in the uplink control channel subframe in the uplink FDD carrier;
Including a method. The HARQ feedback indicates whether the data has been correctly received.
An acknowledgment (ACK) indicating that the data was received correctly, or a negative response (NACK) indicating that the data was not received correctly,
The method of claim 15, indicated by Generating the HARQ feedback indicating whether the data has been correctly received;
17. A method according to claim 15 or 16, comprising selecting a sequence and modulation symbol or selecting a modulation symbol to form the HARQ feedback.   The method according to any one of claims 15 to 17, wherein the HARQ feedback is transmitted on a scheduling request resource in the uplink control channel subframe of the uplink FDD carrier. Spatial bundling is the uplink control for HARQ feedback of both the subframe on the downlink data channel of the downlink FDD carrier and the downlink subframe on the downlink data channel of the TDD carrier. Performed within the channel subframe,
19. Spatial bundling is not performed in the uplink control channel subframe for HARQ feedback of the subframe on the downlink data channel of the downlink FDD carrier. the method of. Each downlink subframe for transmitting data on the downlink FDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier;
20. Each downlink subframe and each special subframe for transmitting data in the TDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier. The method described.   21. The method of claim 20, wherein at least one of a plurality of uplink control channel subframes in the uplink FDD carrier includes only HARQ feedback associated with the downlink FDD carrier.   The method according to claim 20 or 21, wherein each downlink subframe and each special subframe of the TDD carrier is associated with an uplink control channel subframe of the uplink FDD carrier in a one-to-one manner or a many-to-one manner. .   HARQ feedback for the nth downlink subframe is transmitted on the (n + k) th uplink control channel subframe in the uplink FDD carrier, where is an offset value, and n and k are positive 23. A method according to any one of claims 15 to 22 which is an integer.   24. The method of claim 23, wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel. An apparatus for providing a hybrid automatic repeat request (HARQ) in an uplink control channel subframe in an uplink frequency division duplex (FDD) carrier comprising:
A memory for storing program instructions;
A processor coupled to the memory;
Including
When executed by the processor, the instructions are sent to the device,
Receiving data carried by either or both of a subframe on a downlink data channel of a downlink FDD carrier and a downlink subframe on a downlink data channel of a time division duplex (TDD) carrier;
Determining whether the data has been received correctly;
Generating HARQ feedback indicating whether the data was received correctly;
An apparatus for causing the HARQ feedback to be transmitted in the uplink control channel subframe of the uplink FDD carrier. The HARQ feedback indicates whether the data has been correctly received.
Acknowledgment (ACK) indicating that the data was received correctly, or Negative response (NACK) indicating that the data was not received correctly
26. The apparatus of claim 25, indicated by Generating the HARQ feedback indicating whether the data has been correctly received;
27. The apparatus of claim 25 or 26, comprising selecting a sequence and modulation symbol or selecting a modulation symbol to form the HARQ feedback.   28. The apparatus of any one of claims 25 to 27, wherein the HARQ feedback is transmitted on a scheduling request resource in the uplink control channel subframe of the uplink FDD carrier. Spatial bundling is the uplink control for HARQ feedback of both the subframe on the downlink data channel of the downlink FDD carrier and the downlink subframe on the downlink data channel of the TDD carrier. Performed within the channel subframe,
29. Spatial bundling is not performed in the uplink control channel subframe for HARQ feedback of the subframe on the downlink data channel of the downlink FDD carrier. Equipment. Each downlink subframe for transmitting data in the downlink FDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier;
30. Each downlink subframe for transmitting data and each special subframe in the TDD carrier are associated with an uplink control channel subframe in the uplink FDD carrier. The device described.   32. The apparatus of claim 30, wherein at least one of a plurality of uplink control channel subframes in the uplink FDD carrier includes only HARQ feedback associated with the downlink FDD carrier.   32. The apparatus of claim 30 or 31, wherein each downlink subframe and each special subframe of the TDD carrier is associated with an uplink control channel subframe of the uplink FDD carrier in a one-to-one manner or a many-to-one manner. .   HARQ feedback for the nth downlink subframe is transmitted on the (n + k) th uplink control channel subframe in the uplink FDD carrier, where k is an offset value, and n and k are positive. 33. Apparatus according to any one of claims 25 to 32, which is an integer of.   34. The apparatus of claim 33, wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel.   A wireless communication system comprising: the wireless network node according to any one of claims 8 to 14; and the apparatus according to any one of claims 25 to 34.   A non-transitory computer readable storage medium comprising instructions that, when executed, perform the steps of the method of any one of claims 1-7. 25. A non-transitory computer readable storage medium comprising instructions that, when executed, perform the steps of the method of any one of claims 15 to 24.

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