JP6751180B2 - HARQ feedback using carrier aggregation - Google Patents

Description

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

User equipment (UE), also known as receiver, mobile station, wireless terminal, and/or mobile terminal, communicates wirelessly in a wireless communication system, sometimes also referred to as a cellular radio system or wireless communication network. Enabled Communication may take place between UEs, between UEs and wired telephones, and/or between UEs and servers, 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 the like.

The UE/receiver may also be referred to as a mobile phone, a cellular phone, a computer tablet, or a laptop with wireless capabilities, and the like. A UE in the context of the present invention is portable, pocketable, enabled to transmit voice and/or data via a radio access network with another entity, eg another UE or a server. , Handheld, computer-equipped, or in-vehicle mobile devices.

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

At times, the expression "cell" may be used to refer to the radio network node itself. However, a cell may also be used in its normal 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 may serve one or more cells. The radio network nodes can communicate with the UEs within range of their respective radio network nodes over an air interface operating at radio frequency.

In some radio access networks, some radio network nodes may be connected to a radio network controller (RNC), for example in a terrestrial communication line or in microwave, for example in a universal mobile telecommunication system (UMTS). 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: Groupe Special Mobile).

In the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE)/LTE Advanced, which may be referred to as an eNodeB or eNB, a radio network node 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, downlink (DL), downstream link, or forward link may be used for the transmission path from the radio network node to the UE. 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 the communication channel into forward and reverse on the same physical communication medium, for example, frequency division duplex (FDD) and/or time division duplex ( Duplexing methods such as TDD) may be applied. The FDD scheme is used on frequency bands that are well 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. Therefore, the uplink and downlink traffic is transmitted separately from each other in the time dimension of the TDD transmission, with a guard period (GP) between the uplink transmission and the downlink transmission in some cases. In order 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 with synchronization to a common time base and by using the same allocation of resources for the uplink and downlink.

Prior art LTE advanced systems support carrier aggregation and communication between a radio network node (eNodeB) and a UE is facilitated by the simultaneous use of multiple component carriers in the downlink and/or uplink. It The component carriers may be arranged in frequency within one frequency band contiguously or discontinuously, or even in 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 in prior art systems do not operate simultaneously on FDD and TDD carriers, and thus there is no carrier aggregation that utilizes carriers in different duplexing methods. .. However, since network operators may own 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 the HARQ feedback is obtained. HARQ feedback signaling requires uplink transmission resources, and unused uplink resources may be utilized to transmit user data instead, for example, thus minimizing the amount of time frequency resources to be allocated for HARQ feedback. Is essential. A further problem is to allocate a set of uplink resources to ensure that there are no conflicts of uplink resources, ie each receiver/UE must be assigned a unique set of uplink resources for HARQ. That is not the case.

The HARQ feedback may be a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH)/enhanced PDCCH (EPDCCH), a semi-persistent scheduling (SPS) PDSCH, or a PDCCH/EPDCCH indicating SPS release. It is sent in UL in response. Three feedback states, ACK, NACK, and discontinuous transmission (DTX) may be used. At times, NACK may be merged with DTX to 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 has to perform a retransmission. This also makes it impossible to use incremental redundancy for retransmissions. DTX refers to the intermittent transmission that occurs when the UE does not receive the PDSCH, eg fails to receive the transmitted PDCCH/EPDCCH, or has no transmitted PDCCH/EPDCCH or PDSCH.

Therefore, when applying FDD, the same number of uplink and downlink subframes are available in the radio frame, but HARQ feedback is provided in the uplink subframe for each received downlink subframe. Because, and vice versa, can be done. In other words, all downlink subframes may be associated with a particular later uplink subframe for feedback generation, provided that 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. ..

Generally, one HARQ message is associated with each downlink subframe in TDD, since a data packet (eg, transport block in LTE) is transmitted in one subframe. This may require HARQ messages from multiple downlink subframes to be sent in a single uplink subframe, which is the allocation of multiple unique uplink resources for HARQ. Is implied. For example, in such a scenario, which includes four downlink subframes for each uplink subframe, the receiver may use four in one single uplink subframe, as shown in FIG. 1B. HARQ feedback for all three downlink subframes must be provided. In doing so, HARQ feedback may occupy a significant amount of uplink communication resources. Therefore, especially for TDD, it is essential that the network node be able to perform efficient uplink resource allocation when the uplink subframe may 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 because the amount of reserved uplink control channel resources affects the available resources for data transmission. ..

In some access technologies, eg, LTE Advanced, carrier aggregation may be performed by reception/transmission on a set of serving cells, where the serving cells include at least one DL component carrier and possibly UL component. Equipped with a carrier. Here, the concept of cell cannot refer to a geometric area, but rather should be considered as a logical concept. The UE is always configured with a primary serving cell (PCell) and in addition a secondary serving cell (SCell). The Physical Uplink Control Channel (PUCCH) is always transmitted on the PCell.

Regarding carrier aggregation, one major issue concerns 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 the received transport blocks in the downlink. For spatial multiplexing techniques, up to two transport blocks may be sent in downlink subframes on component carriers. For FDD, each downlink subframe may be associated with one unique uplink subframe and the 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. Therefore, 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 becomes a problem, and the resources are unique for different subframes while minimizing the overlay of uplink resources.

There are several PUCCH signaling formats that can carry HARQ feedback in LTE Advanced. One type of PUCCH format utilizes a quaternary phase shift keying (QPSK) or biphasic phase shift keying (BPSK) modulation sequence, such as formats 1a/1b. When extended with a 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 considers UE complexity. This is the most practical case. Another type of PUCCH format is DFT Spread OFDM (ie, format 3), which can carry more HARQ feedback (eg, 20 HARQ-ACK bits). The UE is configured by the radio network node regardless of whether it can use the PUCCH format 3 or PUCCH format 1b based scheme. However, PUCCH format 3 may not be needed if only two component carriers are aggregated.

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

The downlink subframes are shown in FIG. 1D and the uplink subframes are shown in FIG. 1E.

Therefore, in TDD, M=1, 2, 3, or 4 downlink subframes may be associated with an uplink subframe. For aggregating 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 It cannot be supported by using a certain PUCCH format 1b. Therefore, various forms of HARQ information compression techniques are utilized to reduce the number of HARQ-ACK bits. For example, a logical AND operation between HARQ-ACK bits is either between transport blocks within a subframe (spatial bundling), across subframes (time domain bundling), or across component carriers. Can be performed. The drawback is that the bundled NACK implies that retransmissions have to be performed for all transport blocks in the bundle. Therefore, the result is lower throughput and lower spectral efficiency. Bundling is mainly a problem for TDD, since in FDD at most 4 HARQ-ACK bits need to be accepted (assuming 2 component carriers with spatial multiplexing). , Which can be processed in format 1b with channel selection without bundling.

For TDD, the component carrier is configured in one of seven UL-DL configurations and defines the transmission direction of subframes within a 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 an uplink subframe can send HARQ feedback depends on the TDD UL-DL configuration and also on the index of a particular uplink subframe. In fact, the same UL-DL configuration must be used in neighboring cells to avoid UE-UE and eNodeB-eNodeB interference. Therefore, it is not easy to reconfigure the UL-DL configuration, eg to adapt to traffic load. However, LTE Advanced also 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 redirection may be provided with an indication to use a subframe for downlink transmission, even for 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 UE is The HARQ timing may be different (eg, for another reference TDD UL-DL configuration) than the 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). There is also a 2-bit downlink allocation index (DAI) for TDD. For DCI with downlink allocation, DAI is the cumulative number of PDCCH/EPDCCH with allocated 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 with Uplink Grant, 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. .. The DAI information allows the UE to detect whether it misses the PDSCH or PDCCH/EPDCCH (except the last one) and whether it can send a correspondingly bundled ACK or NACK It is good to be able to.

In PUCCH format 1b with channel selection, a set of channels (ie, sequences, or PUCCH resources) is reserved for the UE and then modulated with QPSK symbols as a way of encoding the HARQ message. Suppose you choose one. Given that up to 4 channels are reserved, at most 4 HARQ-ACK bits (ie 16 unique states of HARQ information) may be provided. PUCCH resource reservation may be performed implicitly by mapping time-frequency resources occupied by PDCCH/EPDCCH to PUCCH resources. Implicit resource reservation is used when the PDCCH/EPDCCH is located on the PCell and the PDSCH is scheduled either on the PCell or on the SCell by so-called cross carrier scheduling. The explicit resource reservation is used when the PDCCH/EPDCCH is arranged on the SCell or for the SPS transmission of the PDSCH on the PCell without the PDCCH/EPDCCH. For explicit resource reservation, 2 bits in PDCCH/EPDCCH indicate 1 or 2 higher layer configured resources that may be reserved. These 2 bits are obtained by reusing 2 bits of the transmit power control (TPC) field related to PUCCH. As a result, the TPC command may not be signaled in the DCI when the PDCCH/EPDCCH is sent on the SCell.

For TDD, if only 4 HARQ-ACK bits (i.e. 16 HARQ states) can be sent, then all ACK, NACK and DTC states for two 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 that represent 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 upper layer configured channels (ie, sequence or PUCCH resources). Assuming QPSK modulation, at most 2 bits may be conveyed on the SR resource. If the UE is supposed to send HARQ information with SR, channel selection cannot be performed and the HARQ-ACK bits are bundled such that at most two bundled bits remain. It This will result in selecting only the modulation symbol (ie the QPSK symbol representing 2 bits) and transmitting it on the allocated SR resource. For FDD, this is facilitated by spatial bundling. Moreover, spatial bundling is always performed such that only one HARQ-ACK bit is sent per serving cell, even though two non-bundling HARQ-ACK bits may be sent. That is, spatial bundling is performed on HARQ-ACK bits on PCell (SCell) even if there is no transmission on SCell (PCell). This avoids the case where the UE fails the transmission but the radio network node performs the transmission (thus expecting the bundled HARQ information). For TDD, bundling involves feeding back the number of ACKs between all transport blocks, subframes, and component carriers. However, this bundling mapping is not unique as 10 such states are associated with only two HARQ-ACK bits being bundled. Therefore, the radio network node cannot easily determine the correctly received transmission, and the possibility for retransmission of all transport blocks cannot be ignored.

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

It is problematic to define a method for simultaneous combined HARQ feedback for FDD and TDD carriers.

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

Therefore, the objective is to eliminate at least some of the above-mentioned disadvantages and improve 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 in a radio network node, which receiver comprises a downlink FDD. It is possible to provide hybrid automatic repeat request (HARQ) feedback for data transmitted in the downlink using carrier aggregation of the carrier and at least one time division duplex (TDD) carrier, the method comprising: It includes 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 assigning the 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 in a one-to-one relationship with an uplink control channel subframe on the uplink FDD carrier.

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 an 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 selecting sequences and modulation symbols, or by selecting modulation symbols. And may be allowed 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 a previous possible implementation of the method according to the first aspect, the association mapping of HARQ information to modulation symbols and/or sequences is a method of carrier duplexing. 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 associating the special subframe with the uplink control channel subframe on the uplink FDD carrier may generate at least one uplink subframe on 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 uplink FDD carrier number n+upset at 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 comprises one downlink FDD carrier and two TDD carriers. The total number of downlink subframes and special subframes on the TDD carrier does not exceed the total number of uplink subframes on 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 of HARQ information for FDD and TDD carriers to modulation symbols and sequences is And/or may be based on the 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, HARQ information is transmitted on a scheduling request resource in the uplink of the uplink FDD carrier. The spatial bundling may be performed in an uplink subframe allocated for HARQ feedback on both the downlink FDD carrier and the TDD carrier, and the spatial bundling may be performed on the downlink FDD carrier HARQ feedback. Cannot be performed in the assigned uplink subframe for.

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 type of uplink subframe on the uplink FDD carrier is from an upper layer configured entity: 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 uplink subframes on the uplink FDD carrier. May be determined from higher layer configured entities or by the 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 subframes on the uplink FDD carrier is a spatial subframe for the TDD carrier. It cannot be associated with bundling.

In a fourteenth possible implementation of the method according to the first aspect, or a previous possible implementation of the method according to the first aspect, a sub on the TDD carrier associated with an uplink control channel subframe on the uplink FDD carrier. The frame may be determined from higher layer configured entities or by the 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 comprises bits with 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 relating to the transmitted data is in the uplink FDD carrier assigned to the receiver. It may be received from the receiver on the 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 comprise an enhanced NodeB in the (LTE) system, the receiver May include user equipment (UE), a downlink subframe may include a physical downlink shared channel (PDSCH) on a downlink FDD carrier, and a downlink subframe may be a physical downlink on 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, the radio network node is arranged for data transmission and allocation of uplink control channel resources in the downlink FDD carrier, so that the receiver can carry the downlink FDD carrier and at least one TDD carrier. Allows to provide HARQ feedback for data transmitted on the downlink using aggregation. The radio network node comprises a processor, which is configured to associate each downlink subframe in the downlink FDD carrier with an uplink control channel subframe in the uplink FDD carrier and also in each downlink subframe in the TDD carrier. It is also configured to associate the frame and the special subframe with an uplink control channel subframe in the uplink FDD carrier, and further allocates the uplink control channel resource in the uplink FDD carrier to the receiver according to the association made. 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 the TDD carrier.

In a first possible implementation of the second aspect, the processor further comprises associating 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 is 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 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 also on the uplink control channel resources in the 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, providing uplink HARQ feedback for data received on the downlink using carrier aggregation of a downlink FDD carrier and at least one TDD carrier on an uplink control channel resource in the uplink FDD carrier. A method for receiving data in a subframe on a downlink data channel of a downlink FDD carrier and/or a downlink subframe on a downlink data channel of a TDD carrier is provided. Including doing. The method also includes determining if the data was received correctly. In addition, the method selects a sequence and a modulation symbol, or selects a modulation symbol and ACKs for data that has been determined to be correctly received, and determines that it has not been correctly received. Form 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 HARQ feedback related to the received data, including modulation symbols, or selected modulation symbols in the HARQ message, on the uplink control channel resources on the uplink FDD carrier assigned to the receiver. It further includes that.

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

In a second possible implementation of the third aspect, or a previous implementation of the third aspect, the association mapping of 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, and downlink subframes 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 of HARQ information for FDD and TDD carriers to modulation symbols and sequences is for FDD and/or TDD carriers. It may be based on the FDD and/or TDD HARQ-ACK procedures specified in the 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 sent on a scheduling request resource in the uplink of the uplink FDD carrier and may be spatial bundling. May be performed in an uplink subframe that is assigned for HARQ feedback on both downlink FDD and TDD carriers, and spatial bundling may be performed for uplink assigned for HARQ feedback on the downlink FDD carrier. It cannot be performed 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 subframes 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 may be a user equipment (UE). The downlink subframe may include a physical downlink shared channel (PDSCH) on the downlink FDD carrier, and the downlink subframe includes a physical downlink shared channel (PDSCH) on the TDD carrier. The uplink control channel subframe may include the physical uplink control channel, PUCCH, in the uplink FDD carrier.

According to a fourth aspect, providing uplink HARQ feedback for data received on the downlink using carrier aggregation of a downlink FDD carrier and at least one TDD carrier on an uplink control channel resource in the uplink FDD 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. .. Further, the receiver comprises a processor, the processor being configured to determine whether the data was received correctly, and selecting a sequence or modulation symbol to convert the data determined to be received correctly. An HARQ message corresponding to ACK, NACK for data determined not to be received correctly, and/or DTX for no data received, for uplink FDD carrier up. It is also configured to be formed within a link subframe. In addition, the receiver may provide HARQ feedback related to the received data, including the selected sequence and modulation symbols, or the selected modulation symbols in the HARQ message, to the uplink FDD assigned to the receiver. A transmitter configured to transmit on an uplink control channel resource on a carrier.

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, the problems associated with TDD HARQ feedback, such as heavy use of bundling, large DCI format, and more frequent sending of scheduling requests with HARQ feedback. Avoided. This reduces the amount of bundling and thus less data to be retransmitted when an error is detected. Therefore, performance improvements are provided within the wireless communication system.

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

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

FIG. 3 is a diagram of a TDD subframe according to the related art. FIG. 3 is a diagram of a TDD subframe according to the related art. FIG. 3 is a block diagram showing a TDD radio frame according to the related art. FIG. 3 is a block diagram illustrating a downlink subframe according to the related art. FIG. 3 is a block diagram illustrating an uplink subframe according to the related art. FIG. 3 is a block diagram illustrating a wireless communication system according to some embodiments. FIG. 6 is a block diagram illustrating a radio frame in TDD/FDD according to some embodiments. FIG. 6 is a block diagram illustrating a radio frame in TDD/FDD according to some embodiments. 6 is a flow chart illustrating a method in a wireless network node according to one embodiment. FIG. 3 is a block diagram illustrating a wireless network node according to one embodiment. 6 is a flow diagram illustrating a method at a receiver according to one embodiment. FIG. 6 is a block diagram illustrating a receiver according to one embodiment.

Embodiments of the invention described herein are defined as radio network nodes and methods in radio network nodes, receivers and methods in receivers that may 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 set forth herein, but rather, of these illustrated embodiments. The examples provided are provided so that this disclosure will be thorough and complete.

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

FIG. 2 is a schematic diagram of a wireless communication system 100 including a radio network node 110 in communication with a receiver 120, served by a radio network node 110.

The wireless communication system 100 is at least partially, for example, 3GPP LTE, LTE Advanced, Evolved Universal Terrestrial Radio Access Network (E-UTRAN), Universal Mobile Communication System (UMTS), Global System, to name a few. Four Mobile Communications (original: Groupe Special Mobile) (GSM)/GSM Evolution Enhanced Data Rate (GSM/EDGE), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA) Network, Frequency Division Multiple Access (FDMA) ) Networks, Orthogonal FDMA (OFDMA) Networks, Single Carrier FDMA (SC-FDMA) Networks, Worldwide Interoperability for Microwave Access (WiMax), or Ultra Mobile Broadband (UMB), High Speed Packet Access (HSPA) Evolved Universal Radio Access Technologies such as Terrestrial Radio Access (E-UTRA), Universal Terrestrial Radio Access (UTRA), GSM EDGE Radio Access Network (GERAN), 3GPP2 CDMA technology, eg CDMA2000 1x RTT, and High Rate Packet Data (HRPD). Can be based on. The expressions "wireless communication network," "wireless communication system," and/or "cellular communication system" may sometimes be used interchangeably within the technical context of this disclosure.

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

The illustrative purpose of FIG. 2 is for a simplified overview of wireless communication system 100 and the methods and nodes involved, and the functions involved, such as radio network node 110 and receiver 120 described herein. Is to state. Although the method and wireless communication system 100 is then described in a 3GPP LTE/LTE Advanced environment as a non-limiting example, embodiments of the disclosed method and wireless communication system 100 have already been disclosed above, for example. It may be based on another access technology, such as those listed. Thus, embodiments of the present invention are based on the 3GPP LTE system and may be described using that terminology, but are by no means 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.

It should be noted that the illustrated network settings of the one wireless network node 110 and the one receiver 120 of FIG. 2 should be considered as non-limiting examples of only one embodiment. Wireless communication system 100 may include other numbers of radio network nodes 110 and/or receivers 120, and/or combinations thereof. Accordingly, multiple receivers 120 and other configurations of wireless network nodes 110 may be involved in some embodiments of the disclosed invention.

Thus, whenever "one (one or a/an in English)" receiver 120 and/or wireless network node 110 is referred to in the context of the present invention, multiple receivers are provided according to some embodiments. Machine 120 and/or wireless network node 110 may be involved.

The radio network node 110 may, according to some embodiments, be configured for downlink transmission, each depending eg on the radio access technology and/or the term 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 is correspondingly according to different embodiments and different terms, for example, user equipment (UE), wireless communication terminals, mobile phones, personal digital assistants (PDAs), wireless platforms, mobile stations, tablet computers, mobile phones. Type communication device, laptop, computer, wireless terminal acting as a relay station, relay node, mobile relay station, subscriber premises equipment (CPE), fixed wireless access (FWA) node, or wireless network node 110 to communicate wirelessly May be represented by any other type of device configured to.

Some embodiments of the present invention define a method of 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 on the TDD carrier may be associated with the uplink subframe on the FDD carrier in a one-to-one relationship, and HARQ information transmission on 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 the uplink subframes on the FDD carrier, such as TDD and FDD. HARQ information transmission for carriers is supported.

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

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

The method may be applied in LTE Advanced in some embodiments, and Tables 1, 2, and/or 3 relate HARQ information for FDD and TDD carriers to modulation symbols and/or sequences. It 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 sent on the uplink FDD carrier.

Further, in some embodiments, when transmitting HARQ feedback for scheduling request resources, spatial bundling is performed within an uplink subframe defined for HARQ feedback on both downlink FDD and TDD carriers. , While spatial bundling may not be performed in the uplink subframe defined for HARQ feedback on the uplink FDD carrier.

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

The method where the associated DCI format for the TDD carrier may not utilize DAI, eg, 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 radio frames in TDD/FDD according to some embodiments. In the example shown, two radio frames each containing 10 subframes for TDD uplink/downlink configuration 1 are shown. Further, two radio frames each containing 10 subframes for the FDD uplink and downlink configurations are respectively illustrated.

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

The TDD radio frame in 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, such that spatial, component carrier, and time domain bundling are used more frequently. This is known to reduce the spectral efficiency of the system as unnecessary data retransmissions can occur. This degradation occurs especially when the correlation between the channels is low in the transmission where the bundled HARQ feedback is applied. For example, inter-cell interference and channel fading can be completely different between subframes or between component carriers and can cause losses for subframes and carrier bundling. Moreover, the DCI format is large for TDD. Larger DCI formats reduce the coverage of the control channel, thereby reducing the feasible area where carrier aggregation between TDD and FDD can be used. Moreover, for TDD, there are fewer uplink subframes in the radio frame, which increases the probability that the scheduling request will be sent in the uplink subframes that also carry HARQ feedback. However, the joint transmission of scheduling requests and HARQ feedback relies on a significant amount of HARQ bundling, which reduces performance.

Therefore, in supporting joint HARQ feedback for FDD and TDD carrier aggregation, it is desirable not to introduce unnecessary bundling (or larger DCI size) just by one of the carriers using TDD. Instead, it will be appreciated that in some embodiments it may be preferable to incorporate more of the FDD HARQ mechanism, although this does not rely heavily on bundling.

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 will be at most two HARQ bits per carrier. Therefore, 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 the PUCCH. May be associated with each other. Such a one-to-one relationship may be facilitated by sending HARQ feedback for the PUCCH in subframe n+k for the PDSCH (or PDCCH/EPDCCH indicating SPS release) received in subframe n. The offset value k may be subframe dependent, i.e. dependent on n. On the other hand, it may be fixed, for example k=4, the value used for FDD in the prior art. Therefore, this timing may be applied to the TDD carrier 200 as well, since there is always a corresponding existing uplink subframe 310 for downlink subframe 360 number n, PUCCH on the uplink FDD carrier 300. Is possible if is sent. One of the advantages of using the one-to-one relationship to determine the uplink subframe is that the HARQ feedback corresponding to the TDD carrier is spread over as many subframes as possible on the uplink FDD carrier. Good as a thing. That is, this avoids concentrating the HARQ feedback of multiple subframes of the TDD carrier on a small number of subframes on the uplink FDD carrier. This is beneficial because it makes the PUCCH load more even between subframes and provides robustness against catastrophic channel impairments such as fading dips and severe temporal interference variations.

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

However, each downlink subframe 210 or special subframe 220 on TDD carrier 200 may alternatively be associated in a many-to-one relationship with an uplink subframe 310 on uplink FDD carrier 300, which includes a PUCCH. Please note. Thus, multiple TDD downlink subframes 210 and/or special subframes 220 may be associated with one uplink subframe 310 on uplink FDD carrier 300 in some alternative embodiments.

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

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

Tables 1, 2 and 3 show the mappings in FDD from HARQ states 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, one component carrier containing two transport blocks and one component carrier containing 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, no HARQ bundling (ie, each HARQ-ACK field is associated with one transport block), and implicit resource reservation. Channel support is disabled (ie implicit resources are not associated with HARQ state in DTX) and there is only PDSCH scheduled on PCell (ie SCell is in DTX state) and channel selection is disabled (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 coding for the transmission of HARQ messages using two channels.

表２

Table 2

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

表３

Table 3

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

The advantage of some embodiments herein is that if Tables 1, 2, and 3 are used for subframes where only HARQ-ACK for the FDD carrier should be sent, this situation is The HARQ field for TDD carrier 200 is equal to (DTX, DTX) for such uplink subframes. Examining Tables 1, 2 and 3 shows 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 previously defined. Is.

Further, it may be appreciated that the HARQ-ACK mapping table below is feasible, and the encoding described above is only an example. For example, prior art LTE Advanced systems also include similar tables 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 for 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 may be eliminated for TDD by also using association mapping of HARQ states to FDD to sequence and modulation symbols. Good as a 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 can be PCell. In another example, the FDD carrier may be SCell. For example, in the embodiment of the present invention, Table 3 is applied, HARQ-ACK(0) and HARQ-ACK(1) are associated with the FDD carrier, and HARQ-ACK(2) and HARQ-ACK(3) are associated with the TDD carrier. Can be associated with. In another example, the invention according to one embodiment applies Table 3 to associate HARQ-ACK(0) and HARQ-ACK(1) with a TDD carrier, HARQ-ACK(2) and HARQ-ACK(3). Can be associated with the FDD carrier. Those skilled in the art can create similar examples from other HARQ mapping tables. Therefore, in one embodiment of the present invention, the association mapping of HARQ information to modulation symbols and/or sequences may be the same regardless of the subframe of the carrier and the method of duplexing.

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. Therefore, HARQ feedback bundling may be utilized according to those embodiments.

FIG. 4 shows two radio frames (10 subframes each) and TDD UL/DL configuration 0 (top) 200, TDD UL-DL configuration 1 (middle) 250, and TDD UL/DL FDD carriers 300, 350. An example of HARQ timing for carrier aggregation using (bottom) 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 are included. 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 downlink subframes 210 and special subframes 220 of TDD carriers 200, 250 per radio frame does not exceed the number of FDD uplink subframes 310 per radio frame. It is possible. FIG. 4 illustrates an example in which one TDD carrier 200 using TDD UL-DL configuration 0 is aggregated with another TDD carrier 250 using downlink FDD carrier 350 using TDD UL-DL configuration 1. Is shown. This ensures that the uplink subframe 310 contains HARQ-ACK bits from at most two carriers. Thus, for example, it is possible to utilize Tables 1, 2 and/or 3, i.e. bundling may be avoided altogether. This is in contrast to the prior art, where the 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 number of carriers and their respective TDD UL-DL configuration combinations. For example, in some embodiments, k≧4 may be required for subframes 210, 220, 230 of TDD carriers 200, 250.

A further aspect of the described method involves joint transmission of scheduling requests and HARQ feedback. It may be desirable to avoid bundling operations (spatial, sub-frame, component carrier) performed in prior art LTE advanced systems for TDD. If there is a one-to-one relationship between the downlink subframe 210 on the TDD carriers 200, 250 and the uplink subframe 310 on the uplink FDD carrier 300, then HARQ information from the downlink FDD carrier 350 in some embodiments. It is understood that there can be at least one uplink subframe 310 on the uplink FDD carrier 300 that can be defined to include only. However, in other alternative embodiments, there may be a many-to-one relationship between the downlink subframes 210 on the TDD carriers 200, 250 and the uplink subframes 310 on the uplink FDD carriers 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 on both downlink FDD carrier 350 and TDD carriers 200, 250, and uplink subframe defined for HARQ feedback on downlink FDD carrier 350 only. There is 310. This embodiment is illustrated in FIG.

If the uplink subframe is defined for HARQ feedback on FDD carrier only, at most two HARQ-ACK bits (assuming transmission of two transport blocks) are signaled together with the scheduling request. Needs to be done. If an uplink subframe is 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. , Which is not possible without bundling. If there are two such uplink subframes, the uplink subframe type may need to be known to both the receiver 120 and the radio network node 110 according to some embodiments.

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

Moreover, the use of flexible subframes is contemplated in some embodiments. According to those embodiments, the transmission direction, ie the uplink/downlink, may for example be configurable/reconfigurable to adapt to the radio 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 a higher layer radio resource control (RRC) signaling entity. This entity may take the form of a reference TDD UL-DL configuration (e.g. TDD UL-DL configuration 2 or TDD UL-DL configuration 5), wherein the type of uplink subframe is a reference TDD UL-DL configuration, And a specified HARQ timing for each downlink subframe 210 and special subframe 220 of the TDD carrier 200, 250. In a further example, the RRC entity may include a bitmap whose entries in the bitmap have associated subframes on the TDD carrier 200, 250 in a one-to-one or many-to-one relationship according to the previous embodiment. Indicate whether to be linked to the uplink subframe 310 on the uplink FDD carrier 300. The advantage of this form of signaling may be that the 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 may be 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 the designated HARQ timing for each downlink subframe 210 and special subframe 220 of TDD carrier 200, 250. This information can be directly indicated by a field in the downlink control indicator (DCI). Such DCI fields may relate to one or more upper layer configured reference TDD UL-DL configurations or bitmaps. For example, two such bits in DCI correspond to four states. Each such state may correspond to four upper layer configured TDD UL-DL configurations or bitmaps. The advantage of this kind of dynamic signaling is that the flexible subframes are only used as downlink subframes as needed, so that spatial bundling can be further avoided. , The proportion of time that the uplink subframe 310 must be linked on the uplink FDD carrier 300 for HARQ transmissions is reduced, which in turn requires bundling, eg for HARQ-ACK feedback on scheduling request resources. become.

One embodiment pertains to an uplink subframe defined for HARQ feedback on both downlink FDD carrier 350 and TDD carrier 200, 250. The method then includes spatially bundling in the component carriers and transmitting the 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 sub-frame or component carrier bundling, which is a consequence of prior art LTE when HARQ information compression is reduced. This is an advantage over the advanced system and results in increased system efficiency.

Another embodiment relates to the uplink subframes defined for HARQ feedback on the 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 sending (non-bundling) HARQ-ACK bits on the scheduling request resource.

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

Further, the PUCCH is transmitted on the FDD carrier and the unique uplink subframe 310 on the uplink FDD carrier 300 for each downlink subframe 210 and special subframe 220 of the TDD carrier 200, 250. , The downlink allocation index (DAI) bits in the DCI schedule the data on the TDD carriers 200, 250 (eg, HARQ timing of the TDD carrier may be defined by following the FDD carrier). It may not be necessary for you. It is understood that each subframe containing a downlink transmission on the TDD carrier corresponds in one embodiment to one unique subframe on the uplink FDD carrier. In one embodiment, the DCI format associated with 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 signaling overhead in the system and improves the reliability of the control channel, ie increases the coverage area in which carrier aggregation can be performed. ..

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

Furthermore, in FDD, the HARQ round trip time is 8 subframes, that is, it takes 8 subframes from downlink transmission to transmission/retransmission of the same HARQ process. Therefore, eight HARQ processes are defined for FDD. For TDD, the maximum number of HARQ processes depends on the UL-DL configuration and varies from 4 to 15. This is because in TDD, k≧4 for HARQ timing. It is an advantage if the HARQ round trip time delay can be minimized as this will reduce the response time and latency of the communication system. However, it can be appreciated that it is possible to use smaller values of k as compared to those used for TDD in LTE Advanced. As a result, the 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, eg 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 carry up to four HARQ-ACK bits.

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

The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on the 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) on downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) on TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) on uplink FDD carrier 300.

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

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

The carrier aggregation may include, in some embodiments, one downlink FDD carrier 350 and two TDD carriers 200, 250, a downlink subframe 210 and a special subframe of the 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 for each radio frame.

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.

The downlink control information (DCI) on the downlink control channel associated with the TDD carrier 200 does not include the downlink allocation index (DAI). The DCI on the downlink control channel of TDD carrier 200 may include bits with 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.

The method 500 may include a number of actions 501-505 to properly perform data transmission and allocation of an uplink control channel.

However, any, some, or all of the described actions 501-505 may be performed in a slightly different time sequence than indicated in the enumeration, may be performed concurrently, or may be different. Note that it may even be performed in a completely inverted order according to an embodiment. Some actions may be performed within some alternative embodiments, such as action 505, for example. Furthermore, some actions may be performed in multiple alternative manners according to different embodiments, and some such alternative manners are within the scope of some, but not necessarily all, embodiments. Note that this can only be done in. Method 500 may include the following actions.
Action 501

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

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

The association mapping of HARQ information to modulation symbols and sequences for FDD carriers 300, 350 and TDD carriers 200 is, in some embodiments, 3GPP LTE Advanced Standard 3GPP TS36.213 for FDD carriers 300, 350 and/or TDD carriers 200. May be based on the FDD and/or TDD HARQ-ACK procedure 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 on TDD carrier 200 may be associated in a one-to-one relationship with uplink control channel subframe 310 on uplink FDD carrier 300.

However, in some alternative embodiments, 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 in a many-to-one relationship. obtain.

The association between each downlink subframe 210 and special subframe 220 on the TDD carrier 200 and the uplink control channel subframe 310 on the uplink FDD carrier 300 includes an uplink FDD that includes only HARQ feedback related to the 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 channels in the uplink FDD carrier 300. It may be associated with a subframe 310 and the subframes 210, 220, 230 on a TDD carrier may be determined from an upper layer configured entity or by a downlink control channel.
Action 503

Uplink control channel resources 310 on the uplink FDD carrier 300 are assigned to the receiver 120 according to the associations 501, 502 made.

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

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

The 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, which is associated with transmit (504) data, on uplink control channel resources 340 in uplink FDD carrier 300 (503) assigned to receiver 120.

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 actions 501-505 of the method previously described, which actions of the uplink control channel resources 310 on the uplink FDD carrier 300. Data transmission and allocation is performed, which allows receiver 120 to provide HARQ feedback for data transmitted on the downlink using carrier aggregation of downlink FDD carrier 350 and at least one TDD carrier 200.

The radio network node 110 may include an evolved NodeB (eNodeB). The wireless communication network 100 may be based on the 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) on downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) on TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) on uplink FDD carrier 300.

The radio network node 110 comprises 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 TDD. It is also configured to associate each downlink subframe 210 and special subframe 220 on carrier 200 with an uplink control channel subframe 310 on uplink FDD carrier 300, and further according to the associations made on uplink FDD carrier 300. Configured to allocate uplink control channel resources 310 to receiver 120.

Processor 620, in some embodiments, is configured to associate each downlink subframe 210 and special subframe 220 on TDD carrier 200 with an uplink control channel subframe 310 on 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 include one or more instances of processing circuitry: a central processing unit (CPU), processing unit, processing circuit, processor, application specific integrated circuit (ASIC), microprocessor, or instructions. It may include other processing logic that can be interpreted and executed. Thus, the expression "processor" as used herein may refer to a processing circuit that includes multiple processing circuits, such as, for example, any, some, or all of the above-listed ones. ..

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

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

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

Such a receiver 610 at the radio network node 110 receives wireless signals 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.

Additionally, according to some embodiments, the wireless network node 110 may also include at least one memory 625 within the wireless network node 110, in some embodiments. Optional memory 625 may comprise a physical device utilized to temporarily or permanently store data or programs, ie sequences of instructions. According to some embodiments, the memory 625 may include an integrated circuit that includes 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 with a computer program product for performing the functions of actions 501-505.

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

The computer program product described above is provided, for example, in the form of a data carrier carrying computer program code for performing at least some of actions 501-505 according to some embodiments when loaded into processor 620. obtain. The 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 disk or tape capable of holding machine-readable data in a non-transitory manner. It may be any suitable medium. Further, the computer program product may be provided as computer program code on a server and downloaded to wireless network node 110, eg, via an internet or intranet connection.

FIG. 7 is a flow chart illustrating an embodiment of a method 700 at a receiver 120 within the wireless communication system 100. The method 700 is performed on the uplink control channel resource 310 on the uplink FDD carrier 300 using downlink frequency division duplex (FDD) carrier 350 and carrier aggregation of at least one time division duplex (TDD) carrier 200. It is intended 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 the 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) on downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) on TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) on 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 can include a number of actions 701-704.

However, any, some, or all of the described actions 701-704 may be performed in a slightly different time sequence than indicated in the enumeration, may be performed concurrently, or may be different. Note that it may even be performed in a completely inverted order according to an embodiment. Furthermore, some actions may be performed in multiple alternative manners according to different embodiments, and some such alternative manners are within the scope of some, but not necessarily all, embodiments. Note that this can only be done in. 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 that has been determined to be correctly received (701) (702), and negative acknowledgment (NACK) for data that has been determined to be not correctly received (701) (702). ) And/or a HARQ message corresponding to discontinuous transmission (DTX) for which no data has been received (701) in the uplink subframe 310 of the uplink FDD carrier 300, Sequences and modulation symbols, or modulation symbols are selected.

The associated mapping of HARQ information to sequences and modulation symbols may be independent of the method of carrier duplexing.

The associative mapping of HARQ information to modulation symbols and sequences for FDD carriers 300, 350 and TDD carriers 200 may be performed using the FDD and /Or may be based on a TDD HARQ-ACK procedure.
Action 704

The HARQ feedback related to the received (701) data is assigned to the receiver 120 including the selected (703) sequence and modulation symbols, or the selected (703) modulation symbols in the HARQ message. Transmitted on the uplink control channel resource 310 on the 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 transmitted on the scheduling request resource on the uplink 310 of the uplink FDD carrier 300 in some embodiments. Spatial bundling may be performed in the uplink subframes assigned for HARQ feedback on both downlink FDD carrier 350 and TDD carrier 200, and spatial bundling is HARQ feedback on downlink FDD carrier 350. Cannot be performed in the uplink subframe 310 that is assigned for.

The type of uplink subframe 310 on the uplink FDD carrier 300 may be determined from the upper layer configured entity or by the 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 actions 701-704 of the method previously described, and on the uplink control channel resource 310 on the uplink FDD carrier 300, downlink frequency division duplex (FDD). It is configured to use carrier aggregation of carrier 350 and at least one Time Division Duplex (TDD) carrier 200 to provide HARQ feedback for data received on the downlink.

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 the 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) on downlink FDD carrier 350. Downlink subframe 210 may include a physical downlink shared channel (PDSCH) on TDD carrier 200. Uplink control channel subframe 310 may include a physical uplink control channel (PUCCH) on 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 downlink subframe 210 on the downlink data channel of TDD carrier 200. , A receiver 810.

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

Such a processor 820 may implement one or more instances of processing circuitry: a central processing unit (CPU), processing unit, processing circuitry, processor, application specific integration (ASIC), microprocessor, or instructions. It may include other processing logic that can be interpreted and executed. Thus, the expression "processor" as used herein may refer to a processing circuit that includes multiple processing circuits, such as, for example, any, some, or all of the above-listed ones. ..

In some alternative embodiments, the receiver 120 and/or the processor 820 may comprise a decision unit, which in some embodiments may determine whether the data was received correctly. Composed. Furthermore, the receiver 120 and/or the processor 820 may also comprise a selection unit, which selects the sequence and the modulation symbols, or selects the modulation symbols and determines that they have 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 to the HARQ message is formed in the uplink subframe 310 of the uplink FDD carrier 300.

Further, the receiver 120 also comprises a transmitter 830 for assigning to the receiver 120 HARQ feedback relating to the received data, including the selected sequence and modulation symbols, or the selected modulation symbols in the HARQ message. Configured to transmit on the uplink control channel resource 310 on the uplink FDD carrier 300 being configured.

Additionally, the receiver 120 may also include at least one memory 825 within the receiver 120 in some embodiments. Optional memory 825 may comprise a physical device utilized to temporarily or permanently store data or programs, ie sequences of instructions. According to some embodiments, the memory 825 may 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 at receiver 120 through one or more processors 820 with a computer program product for performing the functions of actions 701-704.

As such, 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 Carrier aggregation for at least one TDD carrier 200 is used to provide HARQ feedback for downlink transmitted data.

The computer program product described above is provided, for example, in the form of a data carrier carrying computer program code for performing at least some of actions 701-704 according to some embodiments when loaded into processor 820. obtain. The 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 disk or tape capable of holding machine-readable data in a non-transitory manner. It may be any suitable medium. Further, the computer program product may be provided as computer program code on a server and downloaded to receiver 120 via, for example, an internet or intranet connection.

The terminology used in the description of the embodiments as illustrated in the accompanying drawings is not intended to limit the described method 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, "1" ("a", "an") in the singular and "the ("the" in the English text)" should be construed as "at least one". Thus, unless otherwise stated, in some cases multiple entities of the same type are included. Further, the phrases “comprising”, “comprising”, “comprising”, and/or “comprising” refer to the presence of stated features, actions, integers, steps, operations, elements, and/or components. 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, as specified. For example, a single unit, such as a processor, may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures 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 together with or as part of other hardware, but via the Internet or other wired or wireless communication systems, etc. It may be distributed in other forms.

Claims (33)

Radio network node for receiving hybrid automatic repeat request (HARQ) feedback for data transmitted on the downlink using carrier aggregation of downlink frequency division duplex (FDD) carriers and time division duplex (TDD) carriers The method in
Associating each downlink subframe for transmitting data on the downlink FDD carrier by the radio network node with an uplink control channel subframe in an uplink FDD carrier;
By the radio network node, and associating with each downlink subframe and the special subframe for transmitting data in the TDD carrier and the uplink control channel subframe in the uplink FDD carrier,
Transmitting , by the radio network node , data to a receiver on at least one of the downlink FDD carrier and the TDD carrier;
Receiving , by the radio network node, HARQ feedback from a receiver associated with the transmitted data in an uplink control channel subframe in the uplink FDD carrier;
Only including,
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 for HARQ feedback of the downlink FDD carrier only. Not performed within said uplink control channel subframe of
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. The association between each downlink subframe in the downlink FDD carrier and the 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 produces 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 according to any one of 1 to 2 . Each downlink subframe and the special subframe of the TDD carrier, in a one-to-one manner or many-to-one method associated with an uplink control channel subframe of the uplink FDD carrier, any of claims 1 to 3 1 Method described in section. 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. The method according to any one of claims 1 to 4 , which is an integer. The method according to claim 5 , wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel. Radio network node for receiving hybrid automatic repeat request (HARQ) feedback for data transmitted on the downlink using carrier aggregation of downlink frequency division duplex (FDD) carriers and time division duplex (TDD) carriers And said wireless network node is
A memory for storing program instructions,
A processor coupled to the memory,
Including,
When executed by the processor, the instructions direct the wireless network node to:
Associating the uplink control channel subframe uplink FDD in the carrier each downlink subframe for transmitting data in the downlink FDD carrier,
Associated with each special subframe and each downlink subframe for transmitting data in the TDD carrier to the 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,
In uplink control channel subframe in the uplink FDD carrier, receives a HARQ feedback from the receiver relating to the data transmitted, is operated so as,
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 for HARQ feedback of the downlink FDD carrier only. Not performed within said uplink control channel subframe of
Wireless network node. The radio network node according to claim 7 , wherein the HARQ feedback is received on a scheduling request resource of the uplink control channel subframe in the uplink FDD carrier. The association between each downlink subframe in the downlink FDD carrier and the 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. association between uplink control channel subframe in the carrier generates at least one uplink control channel subframe of the uplink FDD within a carrier containing only HARQ feedback associated with the downlink FDD carrier, according to claim 7 9. The wireless network node according to any one of 8 to 8 . Each downlink subframe and the special subframe of the TDD carrier, in a one-to-one manner or many-to-one method associated with an uplink control channel subframe of the uplink FDD carrier, to any one of claims 7 to 9 The wireless network node according to item 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 any one of claims 7 to 10 , wherein the radio network node is a positive integer. The radio network node according to claim 11 , wherein the offset value k is determined by an upper layer configured entity or by a downlink control channel. Hybrid automatic for data transmitted on the downlink using carrier aggregation of downlink frequency division duplex (FDD) carriers and time division duplex (TDD) carriers in an uplink control channel subframe within an uplink FDD carrier. A method for providing a retransmission request (HARQ), comprising:
And receiving by the receiver of data carried by either or both of the downlink sub-frame on the downlink data channel of the sub-frame and the TDD carrier on the downlink data channel of the downlink FDD carrier,
And said by the receiver, determining whether the data is correctly received,
Generating HARQ feedback by the receiver indicating whether the data was received correctly;
By the receiver, see containing and transmitting the HARQ feedback in the uplink control channel subframe in the uplink FDD carrier, and,
Spatial bundling refers to 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 a channel subframe,
Spatial bundling is not performed in the uplink control channel subframe for HARQ feedback of the subframe only on the downlink data channel of the downlink FDD carrier,
Method. The HARQ feedback indicates whether the data was received correctly.
An acknowledgment (ACK) indicating that the data was correctly received, or a negative acknowledgment (NACK) indicating that the data was not correctly received,
14. The method of claim 13 , indicated by: Generating the HARQ feedback indicating whether the data was received correctly is
15. The method according to claim 13 or 14 , comprising selecting sequences and modulation symbols by the receiver , or selecting modulation symbols, to form the HARQ feedback. The method according to any one of claims 13 to 15 , wherein the HARQ feedback is transmitted on a scheduling request resource in the uplink control channel subframe of the uplink FDD carrier. Each downlink subframe for transmitting data on the downlink FDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier,
Each downlink subframe and the special subframe for transmitting data in the TDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier, any one of claims 13 to 16 The described method. 18. The method of claim 17 , 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. 19. The method of claim 17 or 18 , 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. 20. A method according to any one of claims 13 to 19 which is an integer. 21. The method of claim 20 , wherein the offset value k is determined by a higher layer configured entity or by a downlink control channel. Hybrid automatic for data transmitted on the downlink using carrier aggregation of downlink frequency division duplex (FDD) carriers and time division duplex (TDD) carriers in an uplink control channel subframe within an uplink FDD carrier. A device for providing a retransmission request (HARQ), comprising:
A memory for storing program instructions,
A processor coupled to the memory,
Including,
When executed by the processor, the instructions direct the device to:
Subframe and on a downlink data channel of the downlink FDD carrier
Downlink subframe on the downlink data channel of the TDD carrier, to receive the data carried by either or both,
Letting you decide if the data was received correctly,
Generate HARQ feedback indicating whether the data was received correctly,
Transmit the HARQ feedback in the uplink control channel subframe of the uplink FDD carrier,
Spatial bundling refers to 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 a channel subframe,
Spatial bundling is not performed in the uplink control channel subframe for HARQ feedback of the subframe only on the downlink data channel of the downlink FDD carrier,
apparatus. The HARQ feedback indicates whether the data was received correctly.
Acknowledgment (ACK) indicating that the data was correctly received, or Negative acknowledgment (NACK) indicating that the data was not correctly received.
23. The device of claim 22 , indicated by. Generating the HARQ feedback indicating whether the data was received correctly is
24. The apparatus of claim 22 or 23 , comprising selecting sequences and modulation symbols, or selecting modulation symbols to form the HARQ feedback. 25. The apparatus according to any one of claims 22 to 24 , wherein the HARQ feedback is transmitted on a scheduling request resource in the uplink control channel subframe of the uplink FDD carrier. Each downlink subframe for transmitting data in the downlink FDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier,
26. Any one of claims 22 to 25 , wherein each downlink subframe for transmitting data and each special subframe in the TDD carrier is associated with an uplink control channel subframe in the uplink FDD carrier. The described device. 27. The apparatus of claim 26 , 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. 28. The apparatus of claim 26 or 27 , 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 scheme or a many-to-one scheme. .. 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. 29. Apparatus according to any one of claims 22 to 28 , which is an integer of 30. The apparatus of claim 29 , wherein the offset value k is determined by a higher layer configured entity or by a downlink control channel. A wireless communication system comprising: the wireless network node according to any one of claims 7 to 12 ; and the device according to any one of claims 22 to 30 . A non-transitory computer-readable storage medium containing instructions that, when executed, carry out the steps of the method according to any one of claims 1-6 . When executed, non-transitory computer readable storage medium comprising instructions step according to any one of the methods of claims 13 to 21 is executed.

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