EQUIPMENT AND METHOD FOR RETURN OF DATA RECEIPT STATUS

专利摘要:
apparatus and method for returning the state of receiving data. an apparatus and method for returning downstream state, applied to an advanced long-term evolution (lte-a) system, are provided. the method includes sequencer, via a user equipment (ue), downlink subframes for transmitting data with respect to each component carrier (cc), generating receive status feedback information for the first x downlink subframes with with respect to each cc according to the sequencing result, where x (less equals) m, where m is the number of downlink subframes in each cc, and transmit the receive status feedback generated with respect to each a cc to a base station. thus, the ue will not skew the receive state for the downlink subframes due to base station inconsistencies between transmit and return receive. this affects hybrid automatic repeat request (harq) transmission, saves uplink headers occupied by the return receive state information, and increases the uplink coverage area.
公开号:BR112012027890B1
申请号:R112012027890-8
申请日:2011-04-28
公开日:2022-01-04
发明作者:Yiangyang Li；Chengjun SUN；Xiaoqiang Li
申请人:Samsung Electronics Co., Ltd；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention relates to the field of radio communication technologies. More particularly, the present invention relates to an apparatus and method for returning data receiving status. BACKGROUND OF THE TECHNIQUE
[002] A Long Term Evolution (LTE) system transmits data based on Hybrid Automatic Retry Request (HARQ), i.e. a data receiver sends back acknowledgment (ACK) or non-acknowledgement status information (NACK) according to the corresponding data receiving state. Scheduling information for dynamic downlink data transmission is transmitted over a Physical Downlink Control Channel (PDCCH), whereas, except for Semi-Persistent Scheduling (SPS), initial transmission scheduling information for downlink data downlink do not need to be transmitted through the PDCCH, and only at the time of retransmission of the downlink data, the scheduling information needs to be transmitted through the PDCCH.
[003] For an LTE Time Division Duplexing (TDD) system, when the number of downlink subframes is greater than the number of uplink subframes, receive status feedback for the data of multiple downlink subframes downlink needs to be transmitted together in the same uplink subframe. One of the methods for the return is to perform an “AND” operation on the return receive state information for the downlink subframes, which transmit data, in order to obtain the receive state return information of one bit for each code word. Because downlink data transmission is dynamically scheduled via a PDCCH, and user equipment (UE) may not be able to receive a PDCCH transmitted from a base station, there may be inconsistencies between the receiver and transmitter. in the method of performing an “AND” operation according to the codeword. To solve this problem, a Downlink Assignment Index (DAI) is used in the LTE TDD system to indicate the serial number of the current downlink subframe in the radio frame transmitting the PDCCH, so that the UE can detect whether a PDCCH in the downlink subframes was lost. For a radio frame with 4 downlink subframes, the DAI value can be 1, 2, 3, and 4.
[004] There is, however, a problem with the above method, ie a case where the last several PDCCHs are lost cannot be detected. In LTE TDD, it is specified that the UE needs to return receive state feedback on the receive state feedback channel corresponding to the last downlink subframe that receives a PDCCH, so that the base station can obtain knowledge of whether the UE has lost the PDCCHs of the last several downlink subframes of the channel on which the UE returns the receive status feedback information.
[005] In an Advanced Long Term Evolution (LTE-A) System, Carrier Aggregation (CA) technology has been used to support a higher baud rate, in which two or more Component Carriers (CC) are aggregated to obtain greater working bandwidth. For example, to support a bandwidth of 100 MHz, five 20 MHz CCs can be aggregated. Based on CA, the base station transmits the downlink data to the UE in two or more CCs. Correspondingly, the UE also has to support the receive status feedback information for the downlink data received from the two or more CCs.
[006] According to the current results of discussions on LTE-A, at most 4 bits of ACK/NACK transmission can be supported based on channel selection technology. In LTE-A Frequency Division Duplexing (FDD), the channel selection method actually only supports two CCs, and at most 2 bits of ACK/NACK information can be returned on each CC. Taking a 4-bit table as an example, for a primary CC (PCC) and a secondary CC (SCC) employing traversal CC scheduling, the two ACK/NCK channels are obtained by scheduling PDCCHs for downlink data transmission. . For example, assuming the minimum SCC index of PDCCH is n, the two channels of ACK/NACK can be obtained by mapping via an LTE method of SCC indices nen + 1. For an SCC not employing traversal CC scheduling , the two ACK/NACK channels are configured by the upper layer, and the flexibility in assignment can be increased through an ACK/NACK Resource Indicator (ARI). According to the current results of the discussion, a 4-bit mapping table as shown in Figure 3 is employed in an FDD system. Here, ACK/NACK channels 1 and 2 correspond to the two ACK/NACK bits of a PCC sequentially, and ACK/NACK channels 3 and 4 correspond to the two ACK/NACK bits of an SCC sequentially. In the table in Figure 3, the feature that the two ACK/NACK channels are always present at the same time on or absent at the same time from the same CC is used to optimize performance. Another 4-bit mapping table is as shown in Figure 12. Here, only when some ACK/NACK information is ACK, the corresponding ACK/NACK channel is selected for transmission. The only exception is that to take full advantage of the return capabilities of M (M is equal to 2, 3 or 4) ACK/NACK channels, when the first piece of ACK/NACK information is NACK and the remaining pieces of ACK/NACK information are all NACK or Discontinuous Receive (DRX), a Quadrature Encoding Phase Shift (QPSK) constellation point of the first ACK/NACK channel can be used for the indication. Such a method as illustrated in Figure 12 can be applied to the situation in which the 4 ACK/NACK bits and the corresponding ACK/NACK channels are all independent of each other.
[007] In the tables, N indicates NACK, A indicates ACK, D denotes DRX and the symbol "/" indicates "or".
[008] For an LTE-A TDD system, in case of supporting CA, the UE needs to return more significant bits of return information from receive status than single-carrier transmission. For example, when a radio frame has 4 downlink subframes for data transmission and 5 CCs, assuming Multiple Input Multiple Output (MIMO) data transmission is configured for the UE, 40 bits of return status information from receipt need to be returned. Apparently, if the method of returning receive state feedback for single carrier is also used, many uplink headers will be occupied and the uplink coverage area will be reduced. Also, all the uplink control channels currently supported in an LTE system cannot support such a large amount of receive state feedback information. If it needs to support 40 return bits, the return channel structure needs to be redefined, which significantly increases the standardization complexity.
[009] Therefore, there is a need for an apparatus and method for returning the receive state, so as to reduce the uplink headers occupied by the return receive state information and increase the uplink coverage area. . DISCLOSURE OF THE INVENTION SOLUTION TO THE PROBLEM
[0010] Aspects of the present invention are to address at least the aforementioned problems and/or disadvantages and provide at least the advantages described below. Therefore, an aspect of the present invention is to provide an apparatus and method for feedback of receive status so as to reduce the uplink headers occupied by the feedback of receive status information and increase the coverage area. uplink.
[0011] In accordance with an aspect of the present invention, a method for returning the status of receiving data, applied to an Advanced Long Term Evolution System (LTE-A) is provided. The method includes sequencing, through a user equipment (UE), downlink subframes to transmit data with respect to each Component Carrier (CC), generating receive status feedback information for the first X downlink subframes with with respect to each CC according to the sequencing result, where X < M, where M is the number of downlink subframes in each CC, and transmit the receive state feedback generated with respect to each CC to a base station.
[0012] As can be seen from the above technical description, UE sequences downlink subframes for data transmission with respect to each CC, generates receive status feedback information for the first X downlink subframes according to the sequencing result, and transmits the receive status feedback information for each CC to the base station. Because the UE reports the receive state for only X downlink subframes, the base station can perform a hybrid Automatic Repeat Request (HARQ) processing over the first X downlink subframes. For the last downlink subframes, the base station can perform processing assuming that the UE does not receive Physical Downlink Control Channels (PDCCHs). Therefore, the base station can reach an agreement with the UE on the UE's receive state, ensuring that the UE will not skew the receive state for the downlink subframes due to inconsistencies with the base station between transmit and receive messages. return for which the HARQ transmission is affected. Furthermore, an exemplary embodiment of the present invention employs a method of returning the receive status feedback information for only the first X downlink subframes, which, in Carrier Aggregation (CA) technology, holds the downlink headers. uplinks occupied by the receive state feedback information and increases the uplink coverage area.
[0013] Other salient aspects, advantages, and features of the present invention will be apparent to those skilled in the art from the following detailed description, which, in conjunction with the accompanying drawings, describes exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The aforementioned and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:
[0015] Figure 1 is a flowchart illustrating a method for returning to receiving state according to an exemplary embodiment of the present invention;
[0016] Figure 2 illustrates a downlink subframe transmission state in accordance with an exemplary embodiment of the present invention;
[0017] Figure 3 illustrates a 4-bit mapping table used in a Frequency Division Duplexing (FDD) Advanced Long Term Evolution (LTE-A) System, according to an exemplary embodiment of the present invention;
[0018] Figure 4 illustrates the grouped return state when M = 2 according to an exemplary embodiment of the present invention;
[0019] Figure 5 illustrates the grouped return state when M = 3 according to an exemplary embodiment of the present invention;
[0020] Figure 6 illustrates the grouped return state when M = 4 according to an exemplary embodiment of the present invention;
[0021] Figure 7 illustrates a mapping relationship of return state to 2 Acknowledgment/Non-Acknowledgement (ACK/NACK) bits, in an FDD table according to an exemplary embodiment of the present invention;
[0022] Figure 8 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention;
[0023] Figure 9 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention;
[0024] Figure 10 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention;
[0025] Figure 11 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention;
[0026] Figure 12 illustrates a 4-bit mapping table in accordance with an exemplary embodiment of the present invention;
[0027] Figure 13 illustrates a return state mapping relationship for 2 bits of ACK/NACK in accordance with an exemplary embodiment of the present invention; and
[0028] Figure 14 is a block diagram illustrating an apparatus for returning data receiving status in accordance with an exemplary embodiment of the present invention.
[0029] Throughout the drawings, like reference numerals will be understood to refer to similar parts, components and structures. BEST WAY TO CARRY OUT THE INVENTION
[0030] The description which follows with reference to the accompanying drawings is provided to aid in a complete understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes several specific details to aid in that understanding, but these are to be regarded as illustrative only. Accordingly, those skilled in the art will recognize that various changes and modifications to the embodiments described herein may be made without departing from the scope and spirit of the invention. In addition, descriptions of known functions and constructions may be omitted for clarity and brevity.
[0031] The terms and words used in the following description and claims are not limited to bibliographic meanings, but are merely used by the inventor to allow a clear and consistent understanding of the invention. Therefore, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for purposes of illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
[0032] It is to be understood that the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more such surfaces.
[0033] The term "substantially" is understood to mean that the recited characteristic, parameter or value need not be achieved exactly, but that deviations or variations, including, for example, tolerances, measurement error, measurement accuracy limitations and others factors known to those skilled in the art may occur in amounts which do not preclude the effect the trait is intended to provide.
[0034] Exemplary embodiments of the present invention provide an apparatus and method for returning data receive status so as to reduce uplink headers occupied by return receive status information and increase the uplink coverage area .
[0035] Figures 1 to 14, discussed further below, and the various exemplary embodiments used to describe the principles of the present disclosure in the present patent document are by way of illustration only and should not be interpreted in any way as limiting the scope of the invention. revelation. Those of skill in the art will understand that the principles of the present disclosure can be implemented in any communications system in a suitable arrangement. The terms used to describe the various modalities are exemplary. It is to be understood that these are provided merely to aid understanding of the description, and that their use and definitions in no way limit the scope of the invention. Terms first, second, and similar are used to differentiate between objects with the same terminology and are in no way intended to represent chronological order, unless explicitly stated otherwise. A set is defined as a non-empty set including at least one element.
[0036] Figure 1 is a flowchart illustrating a method for returning data receiving status according to an exemplary embodiment of the present invention.
[0037] Referring to Figure 1 , a user equipment (UE) sequences downlink subframes to transmit data to the UE with respect to each Component Carrier (CC) in step 101. More particularly, sequencing priorities may be set from highest to lowest for downlink subframes transmitting Semi-Persistent Scheduling Service (SPS) data and downlink subframes for transmitting dynamic data.
[0038] If there are multiple downlink subframes transmitting SPS service data, they can be sequenced by subframe indices occupied by the downlink subframes to transmit SPS service data. If there are multiple downlink subframes transmitting dynamic data, they can be sequenced in ascending order of Downlink Assignment Indexes (DAIs).
[0039] If there is no downlink subframe transmitting SPS service data, downlink subframes for transmitting dynamic data can be directly sequenced in an ascending order of DAIs.
[0040] In Carrier Aggregation (CA), there may be some CCs not transmitting data to the UE, or the UE may not have received data from some CCs. For these CCs, receive status feedback from Discontinuous Receive (DRX) is generated directly. That is, CCs from which the UE has not received data will not be involved in steps 102 and 103, according to an exemplary embodiment of the present invention.
[0041] In step 102, the receive status feedback information for the first X downlink subframes can be generated with respect to each CC in accordance with the order of the downlink subframes for data transmission, where X < M, M is the number of downlink subframes in CC. In this step, receive status feedback information is generated with respect to each CC in accordance with sequencing step 101.
[0042] In accordance with an exemplary embodiment of the present invention, only the receive status feedback information for the first X downlink subframes is returned with respect to each CC. The return receive status information returned may include full acknowledgment (ACK) for the first X downlink subframes or full non-acknowledgement (NACK) for the first X downlink subframes. Alternatively, both ACK and NACK may be included, eg ACK for some of the first X downlink subframes and NACK for the others, DRX for some of the first X downlink subframes, or others. No comments will be made for the last downlink subframes. More particularly, X may not have a fixed value, and may take on different values depending on different receive state return information for the downlink subframes sequenced in accordance with step 101.
[0043] Upon receiving the receive status feedback information in the CC, the base station performs hybrid automatic retry request (HARQ) processing on the downlink data of the first X downlink subframes according to the feedback information corresponding receipt status. For the downlink data of the last downlink subframes, the base station must perform processing assuming that the UE does not receive the Physical Downlink Control Channels (PDCCHs) that schedule that data.
[0044] The UE may perform first spatial grouping on the receive state return information for two codewords (CWS) in each downlink subframe. That is to say, in the case of a Multiple Input Multiple Output (MIMO) transmission, an “AND” operation is performed on the receive status return information to the two CWS to obtain a piece of return status information from grouped receipt. When no MIMO transmission is applied, a piece of receive state return information is obtained directly. Afterwards, the receive state feedback information for only the first X downlink subframes is returned and no comment is made for the last downlink subframes.
[0045] If more exact receive state has to be returned, spatial clustering cannot be performed. That is, in the case of MIMO data transmission, receive state feedback information for two CWS is returned with respect to each subframe of the first X downlink subframes. In this case, two exemplary implementations of generating receive state feedback can be used.
[0046] In a first exemplary implementation, receive-state feedback for the first X1 downlink subframes is returned relative to a CW with an index of 0 and receive-state feedback for the first X2 downlink subframes descendant is returned relative to a CW with an index of 1, where X1 and < M X2 < M. X1 and X2 may or may not be equal. That is, receive state feedback information for the first several downlink subframes is returned with respect to each CW.
[0047] With respect to CW with an index of 0, the generated receive state feedback information can be all ACK for the first X1 downlink subframes or all NACK for the first X1 downlink subframes. Alternatively, both ACK and NACK may be included, for example ACK for some of the first X1 downlink subframes and NACK for the others, DRX for some of the first X1 downlink subframes, or others. Likewise, with respect to CW with an index of 1, the generated receive state feedback information can be all ACK for the first X2 downlink subframes or all NACK for the first X2 downlink subframes. Alternatively, both ACK and NACK may be included, for example ACK for some of the first X2 downlink subframes and NACK for others, DRX for some of the first X2 downlink subframes, or others.
[0048] Upon receiving the return status information on the CC that is returned, respectively, with respect to the two CWS, the base station performs a HARQ processing on the CW with an index of 0, in the first X1 subframes of downlink according to the corresponding receive state return information. For the CW with an index of 0 in other downlink subframes, the base station performs processing assuming that the UE does not receive the PDCCHs that schedule such downlink subframes. The base station performs HARQ processing on the CW with an index of 1, in the first X2 downlink subframes according to the corresponding receive status feedback information. For the CW with an index of 1 in other downlink subframes, the base station performs processing assuming that the UE does not receive the PDCCHs that schedule such downlink subframes.
[0049] Taking an example for the first method, we assume that MIMO data transmission is applied to a CC and no spatial clustering is performed, but return information of receive state for each CW is returned. If M is equal to 3, 5 types of receive state return information can be generated for each CW. For example, 1) every ACK for return receive state information for the first three downlink subframes, 2) every ACK for return receive state information for the first 2 downlink subframes, 3) every ACK for receive-state feedback information for the first downlink subframe, 4) NACK and ACK for receive-state feedback information for the first 2 downlink subframes, and 5) NACK or DRX for receive-state feedback information for the first downlink subframe. Therefore, 5 x 5 = 25 types of information in total need to be returned in relation to the two CWS of each CC.
[0050] In a second exemplary implementation, receive state feedback information for two CWS is returned, respectively, with respect to each subframe of the first X downlink subframes.
[0051] In this case, the generated receive state feedback information can be all ACK for the two CWS of the first X downlink subframes or all NACK for the two CWS of the first X downlink subframes. Alternatively, both ACK and NACK can be included, e.g. ACK for the two CWS of some of the first X downlink subframes and NACK for the two CWS of others, DRX for the two CWS of some of the first X downlink subframes descendant, or others.
[0052] Upon receiving the receive status feedback in the CC for the first X downlink subframes, the base station performs HARQ processing on the two CWS in the first X downlink subframes according to the feedback information from corresponding receiving state. For other downlink subframes, the base station performs processing assuming that the UE does not receive the PDCCHs that schedule such downlink subframes.
[0053] Taking an example for the second exemplary implementation, MIMO data transmission can be applied to a CC and no spatial clustering is performed, but receive state for the two CWS in the first X downlink subframes is returned respectively . If M equals 4, there can be 13 types of receive state return information. More particularly, 1) every ACK and ACK for return information for the two CWS in the first X downlink subframes (i.e. X equals 1, 2, 3 or 4), 2) every ACK and NACK for backlink information return for the two CWS in the first X downlink subframes, 3) every NACK and ACK for return information for the two CWS in the first X downlink subframes, 4) NACK and DRX for the return information for the two CWS in the first downlink subframe, and so on.
[0054] Also, for a CC configured with a data transmission mode of MIMO, only one CW can be transmitted in a subframe, ie the other CW is not used to transmit subframe data. In this case, one of the processing methods is to define a fixed value for the return information for this CW that does not transmit data, such as ACK, NACK and DRX. Another treatment method is to sequence the downlink subframes with respect to each CW in step 101 and sequence the downlink subframes only with respect to the CW actually transmitting data. These two treatment methods are compatible with the above-mentioned method and have no influence on it.
[0055] In step 103, the UE transmits the received status feedback information generated with respect to each CC to the base station.
[0056] In this step, the UE may use a method of encoding the receive status return information for the CCs together for transmission. Other methods may also be employed, for example a method based on channel selection, and the like.
[0057] UE may return receive status feedback regarding all CCs in a cell, may return receive status feedback information regarding CCs configured for the UE by the base station, or may return information receive status feedback with respect to active CCs configured for the UE via the base station.
[0058] With respect to step 102, examples of receive state return information returned with respect to CCs are described below, where M has different values. In this case, it is assumed that five types of information need to be returned relative to a CC.
[0059] Assume M is equal to 2. If spatial grouping is applied to return receive state information for each downlink subframe, then based on downlink subframe sequencing for data transmission in an order based in service type and DAI, the return receive state information may include 1) both ACK for return receive state information for the first 2 downlink subframes, 2) ACK for return receive state information for the first downlink subframe, 3) NACK and ACK, respectively, for return receive state information for the first 2 downlink subframes, 4) NACK for return receive state information for the first downlink subframe downlink and non-ACK for return receive state information for the second downlink subframe, if present, and 5) DRX for return information receive state for the first downlink subframe.
[0060] Assume M is equal to 3. If spatial grouping is applied to return receive state information for each downlink subframe, then based on downlink subframe sequencing for data transmission in an order based in the service type and DAI, the return receive state information may include 1) every ACK for return receive state information for the first three downlink subframes, 2) both ACK for return receive state information for the first 2 downlink subframes, 3) ACK for return receive state information for the first downlink subframe, 4) NACK and ACK, respectively, for return receive state information for the first two subframes of downlink, 5) NACK for return receive state information for the first downlink subframe and non-ACK for return information the receive state for the second downlink subframe, if present, or DRX for return receive state information for the first downlink subframe.
[0061] Assume M is equal to 4. If spatial grouping is applied to return receive state information for each downlink subframe, then based on downlink subframe sequencing for data transmission in an order based in service type and DAI, the return receive state information may include 1) all ACK for return receive state information for the first 4 downlink subframes, 2) all ACK for return receive state information for the first three downlink subframes, 3) both ACK for return receive state information for the first 2 downlink subframes, 4) ACK for return receive state information for the first downlink subframe, and 5) NACK or DRX for return receive state information for the first downlink subframe.
[0062] An exemplary embodiment of the present invention is not limited to the above-mentioned examples of Receive Status Feedback and the number of Receive Status Feedback types generated with respect to each CC is not limited to 5.
[0063] In step 102 above, suppose that 4 types of return states need to be returned to the CC and thus two bits can be used for their indication. Methods of generating return state will be described below with respect to different values of M.
[0064] Figure 4 illustrates the grouped return state when M = 2 according to an exemplary embodiment of the present invention.
[0065] Referring to Figure 4, assume that M is equal to 2. If spatial grouping is applied receive-state feedback information for each downlink subframe, then based on downlink subframe sequencing for transmission data in an order based on service type and DAI, as shown in Figure 4, the 4 types of return states are defined as: 1) both ACK for return receive state information for the first 2 downlink subframes , 2) ACK for return receive state information for the first downlink subframe and NACK/DRX for return receive state information for the second downlink subframe, 3) NACK and ACK, respectively, for return information receive state return for the first 2 downlink subframes, and 4), except for return state 2), NACK/DRX for receive state return information for op first downlink subframe.
[0066] Figure 5 illustrates the grouped return state when M = 3 according to an exemplary embodiment of the present invention.
[0067] Referring to Figure 5, suppose M is equal to 3. If spatial grouping is applied receive-state feedback information for each downlink subframe, then based on downlink subframe sequencing for transmission data in an order based on service type and DAI, as shown in Figure 5, the 4 types of return states are defined as: 1) every ACK for return receive state information for the first three downlink subframes , 2) both ACK for return receive state information for the first 2 downlink subframes and NACK/DRX for return receive state information for the third downlink subframe, 3) ACK for return state information for the first downlink subframe and NACK/DRX for return receive status information for the second downlink subframe, and 4) NACK/DRX for return receive state information for the first downlink subframe.
[0068] Figure 6 illustrates the grouped return state when M = 4 according to an exemplary embodiment of the present invention.
[0069] Referring to Figure 6, assume that M is equal to 4. If spatial grouping is applied to return receive state information for each downlink subframe, then based on downlink subframe sequencing for transmission of data in an order based on service type and DAI, five types of return information can be obtained first a) every ACK for return receive state information for the first 4 downlink subframes, b) every ACK for backlink information receive state return for the first three downlink subframes and NACK/DRX for receive state return information for the fourth downlink subframe, c) both ACK for receive state return information for the first 2 downlink subframes and NACK / DRX for return receive state information for the third downlink subframe, d) ACK for return information receive state node for the first downlink subframe and NACK/DRX for return receive state information for the second downlink subframe and e) NACK/DRX for return receive state information for the first downlink subframe downward. Then, the four types of states to be returned are obtained through multi-to-one mapping of the five types of return information. As shown in Figure 6, for example, the base station can map return information types a) and d) to the same state type, i.e. return state type 3), and maps return information types b ), c) and e), respectively, for the other three state types, i.e. return state types 1), 2) and 4), so that they can be indicated with 2 bits. With such a multi-to-one method, when both types of return information a) and d) are possible, the base station cannot determine that the return information is actually a) or d). One possible solution is to perform a processing taking the number of successive ACKs as 4 when the base station actually transmitted four subframe data and performing a processing taking the number of successive ACKs as 1 when the base station actually , transmitted data of less than 4 subframes. Exemplary embodiments of the present invention will not limit the particular behavior of the base station.
[0070] Figure 8 illustrates the processing of 5 types of return information in 4 types of states to be returned according to an exemplary embodiment of the present invention.
[0071] Referring to Figure 8, where 4 types of return states are obtained through multi-to-one mapping of the five types of return information, that is, where two types of return information are combined into the same type of state, the base station can, in practice, process the combined state type taking into account the type of return information with a smaller number of successive ACKs, in order to avoid inconsistencies. As shown in Figure 8, for example, return information types a) and b) are combined into return state type 1) and the other three return information types c), d) and e) are mapped respectively to the return information types c), d) and e) return state types 2), 3) and 4). The base station fixedly controls the HARQ transmission of return state types 1) according to return information type b), i.e. ACK for receive state return information for only the first three downlink subframes. Thus, even when the UE receives the four subframe data completely correct, the base station will retransmit the fourth subframe data.
[0072] Figure 9 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention.
[0073] Referring to Figure 9, return information types d) and e) are combined into a return state type 4) and the other three return information types a), b) and c) are mapped respectively to the return types. return state 1), 2) and 3). The base station fixedly controls the transmission of return state type HARQ 4) according to the return information type e), i.e. retransmits all data. With this method, there are no base station inconsistencies between types of return information, but unnecessary retransmissions can be increased.
[0074] In an exemplary embodiment of the present invention, the return state type 1) refers to the first return state type, return state type 2) refers to the second return state type, return type return state 3) refers to a third type of return state, and type of return state 4) refers to the fourth type of return state.
[0075] In an exemplary implementation of processing the five types of return information for the 4 types of return states, one of the return information types is divided into two substate types, which are combined with two other types of return information , in order to obtain four types of return state.
[0076] Figure 10 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention.
[0077] Referring to Figure 10, return information type b) can be divided into sub information type b1), i.e. every ACK for return information of receive state for the first three downlink subframes and DRX for information return state for the fourth downlink subframe, and subinformation type b2), i.e., every ACK for return receive state information for the first three downlink subframes and NACK for return state information reception for the fourth downlink subframe. Then the sub information type b1) and return information type a) are combined into the same return state type 1), sub information type b2) and return information type C) are combined into the same return type. return state 2), and return information types d) and e) are respectively mapped to return state types 3) and 4). A method performed by the base station is described as follows. When the base station actually programmed the data of four subframes, return state type 1) may indicate that all four subframes were received correctly or the first 3 subframes were received correctly and the PDCCH of the fourth subframe was lost . As designed for Long Term Evolution (LTE) system, the probability of losing a PDCCH is very low, which is about 0.01 and the UE supporting the CA is in a better channel state so that the probability of correctly receiving PDCCHs is very high. In one implementation, the base station may also purposely increase the probability of receiving the PDCCH of the fourth subframe, so as to reduce the probability of sub-information type b1). Therefore, the base station can treat return state type 1) as return information type a). When the base station actually programmed the data of 4 subframes, the return information type a) is impossible. Therefore, the base station can treat return state type 1) as sub information type B1). In case of return state type 2), because there may not be big difference between the probabilities of return information type C) and sub information type b2), the base station can handle HARQ transmission according to the type of return information c) in a fixed manner. Here, in case of sub-information type b2) in real, the base station can retransmit the data of the third subframe additionally. An advantage of this mapping method is that when the base station programs data of only less than or equal to 3 subframes, there is actually no repeated mapping of return information in order to ensure optimal performance.
[0078] Figure 11 illustrates the processing of 5 types of return information into 4 types of states to be returned according to an exemplary embodiment of the present invention.
[0079] Referring to Figure 11, return information type d) can be divided into sub information type d1), i.e. ACK for return information of receive state for the first downlink subframe and DRX for return information of receive state in the last three downlink subframes and subinformation type d2), i.e. ACK for return receive state information for the first downlink subframes and not every DRX for return receive state information in the last three downlink subframes. After that, sub information type d1) and return information type a) are combined into the same return state type 1), sub information type d2) and return information type e) are combined into the same return state type. return 4), and return information type b) and c) are respectively mapped to return state types 2) and 3). A method performed by the base station is described as follows. When the base station actually programmed the data of four subframes, return state type 1) may indicate that all four subframes were received correctly or UE received the first subframe correctly and the PDCCHs of the last three subframes were lost . As designed for the LTE system, the probability of missing a PDCCH is very low, which is about 0.01, and the probability of missing the 3 subframe PDCCH is even less. Therefore, when the base station receives return state type 1), the possibility that the information returned from the UE is actually a) is very high. Therefore, the base station can treat return state type 1) as return information type a). When the base station actually programmed the data of 4 subframes, the return information type a) is impossible. Therefore, the base station can treat return state type 1) as sub-information type d1). In case of return state type 4), because there may not be big difference between the probabilities of return information type e) and sub information type D2), the base station can handle HARQ transmission according to the type of return information e) in a fixed form. In this case, because a CA user usually needs to transmit a lot of data and with this method, returns on the scenarios where the data of subframes 4, 3 and 2, calculated from the first subframe, are received correctly are optimized, it is easy to increase the downlink transfer rate when the base station actually transmits the data of four subframes. However, when the base station programs data of only less than or equal to 3 subframes, the return information is not optimal with this method.
[0080] Exemplary embodiments of the present invention can take advantage of DAI. DAI can be used not only to sequence the downlink subframes for data transmission, but also to increase the amount of receive state feedback information.
[0081] Figure 2 illustrates a downlink subframe transmission state in accordance with an exemplary embodiment of the present invention.
[0082] Referring to Figure 2, an example is illustrated in which, when M is equal to 4, the downlink subframe with a DAI of 1 is the third downlink subframe of the M downlink subframes. In this case, the possible return information may be just ACK for return information of receiving state for the first two downlink subframes, ACK for receiving return information for the first downlink subframe state, or NACK/DRX for return receive state information for the first downlink subframe. It is not possible for receive-state feedback for the first 4 downlink subframes to be ACK and receive-state feedback for the first three downlink subframes to be ACK. Therefore, the method where there are 5 types of receive state feedback information cannot take advantage of the uplink feedback capability.
[0083] According to an exemplary embodiment of the present invention, the form of receive status feedback information can be determined according to the position of the downlink subframe with a DAI of 1 in the M downlink subframes, thus increasing the amount of receive state feedback information for each CC without increasing the headers and further improving the downlink transmission performance.
[0084] More particularly, referring back to step 102 of Figure 1, the UE can obtain the maximum number of N downlink subframes so that the base station can transmit downlink data, according to the position of the downlink. downlink subframe with a DAI of 1 in the M downlink subframes. In this case, the UE can generate receive status feedback information such that the receive status feedback information for the data of N downlink subframes is transmitted in an uplink subframe. Correspondingly, the base station receives feedback information also in such a way that the receive-state feedback information for the data of N downlink subframes is transmitted in an uplink subframe.
[0085] The value of N is discussed below. If no SPS service data is included in the M downlink subframes, the subframe index of the downlink subframe with a DAI of 1 is assumed to be k, where k has a value from 1 to M. When the UE receives the PDCCH of the downlink subframe with a DAI of 1, the UE may determine that the maximum value of the number of downlink subframes for which the base station transmits data is Mk + 1. The UE may transmit feedback information of such that the receive state feedback information for the data of the Mk + 1 downlink subframes is transmitted in an uplink subframe. Correspondingly, the base station receives feedback information also in such a way that the receive-state feedback information for the data of the M-k+1 downlink subframes is transmitted in an uplink subframe.
[0086] If SPS service data is included in M downlink subframes, the subframe index of the downlink subframe with a DAI of 1 is assumed to be k, where k has a value from 1 to M as well as the number of downlink subframes for transmitting the SPS service data and each with an index less than k is assumed to be MSPS. When the UE receives the PDCCH of the downlink subframe with a DAI of 1, the UE can determine that the maximum value of the number of downlink subframes for which the base station transmits the data is M-k + 1 + MSPS. The UE may transmit feedback information such that receive-state feedback information for the data of the M-k+1+MSPS downlink subframes is transmitted in an uplink subframe. Correspondingly, the base station receives feedback information, too, such that receive-state feedback information for the data of the M-k+1+MSPS downlink subframes is transmitted in an uplink subframe.
[0087] Referring again to Figure 2, M is assumed to be equal to 4. Because the base station actually programmed and transmitted data, the base station is aware that the downlink subframe with a DAI of 1 is the third and so receives the receive state feedback information from the UE such that the receive state feedback information for the data of two downlink subframes is transmitted in an uplink subframe. On the other hand, when the UE receives the downlink subframe with a DAI of 1, the UE may determine that the maximum value of the number of downlink subframes for which the base station transmits the data is 2 and therefore return receive state feedback information such that the receive state feedback information of two downlink subframes is transmitted in one uplink subframe. However, when the UE does not receive the PDCCH and downlink subframe data with a DAI of 1, although the UE is unaware of the position of the downlink subframe with a DAI of 1, the UE discards the PDCCH and data from the downlink subframe. downlink subframe with a DAI of 1 and can return fixed NACK or DRX, avoiding inconsistencies.
[0088] An exemplary implementation, where the receive state feedback information is generated according to the downlink subframe position with a DAI of 1 is described below. Again, assume that M is equal to 4 and 5 types of return information are generated with respect to each CC.
[0089] When the downlink subframe with a DAI of 1 is the first of the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of four downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the return information of receive state as returned is 1) every ACK for return information of receive state for the first 4 subframes of downlink, 2) every ACK for return receive state information for the first three downlink subframes, 3) both ACK for return receive state information for the first 2 downlink subframes, 4) ACK for information receive state feedback for the first downlink subframe, and 5) NACK or DRX for receive state feedback information for the first downlink subframe.
[0090] When the downlink subframe with a DAI of 1 is the second in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of three downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the receive state return information is 1) all ACK for receive state return information for the first three downlink subframes , 2) both ACK for return receive state information for the first 2 downlink subframes, 3) ACK for return receive state information for the first downlink subframe, 4) NACK and ACK, respectively, for receive state feedback information for the first 2 downlink subframes, 5) NACK for receive state feedback information for the first downlink subframe and non-ACK for receive state feedback information for the second downlink subframe , if present, or DRX for return receive state information for the first downlink subframe.
[0091] When the downlink subframe with a DAI of 1 is the third in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of two downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the receive state return information is 1) both ACK for receive state return information for the first 2 downlink subframes , 2) ACK for return receive state information for the first downlink subframe, 3) NACK and ACK, respectively, for return receive state information for the first 2 downlink subframes, 4) NACK for information return receive state for the first downlink subframe and non-ACK for return receive state information for the second downlink subframe, if present, and 5) DRX for return receive state information for the first downlink subframe.
[0092] When the downlink subframe with a DAI of 1 is the fourth in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of a single downlink subframe downlink is transmitted in an uplink subframe. In case of MIMO data transmission, full receive state return information of two transport blocks (TB) can be returned, i.e. two bits of ACK/NACK information and DRX state, 5 types of state in the total. When no MIMO data transmission is applied, three return state types i.e. NACK, ACK and DRX can be defined for a TB with two additional types of null states i.e. 5 state types in total. Alternatively, 5 return state types can be mapped in such a way that the receiving state return information from the other TB is a certain fixed value (ACK or NACK).
[0093] Another exemplary implementation where the return state is generated according to the downlink subframe position with a DAI of 1 is described below. Again, assume that M equals 4 and 4 types of return states are generated with respect to each CC.
[0094] When the downlink subframe with a DAI of 1 is the first of the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of four downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the return state is returned according to, for example, one of the methods as shown in Figures 6 to 11.
[0095] When the downlink subframe with a DAI of 1 is second in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of three downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the return state is returned according to, for example, the method as shown in Figure 5.
[0096] When the downlink subframe with a DAI of 1 is the third in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of two downlink subframes is transmitted in an uplink subframe. Based on sequencing subframes for transmitting data in an order based on service type and DAI, the return state is returned according to, for example, the method as shown in Figure 4.
[0097] When the downlink subframe with a DAI of 1 is the fourth in the M downlink subframes, the feedback information is transmitted so that the receive state feedback information for the data of only 1 downlink subframe downlink is transmitted in an uplink subframe. In the case of MIMO data transmission, full receive status feedback from the two TBs can be returned, i.e. two bits of ACK/NACK information. When no MIMO data transmission is applied, three return state types i.e. NACK, ACK and DRX can be defined for a TB with an additional null state type i.e. four state types in total. Alternatively, 4 types of return states can be mapped in such a way that the receiving state return information from the other TB is a certain fixed value (ACK or NACK).
[0098] Returning to step 103 of Figure 1, the receive status feedback information for the individual CCs can be encoded together for transmission. For example, if the number of return state types for each CC is taken as Y, the number of CCs is taken as N, and ceil(log2(Y)) bits can be used to represent the Y return types for each CC state, where ceil() represents rounding up, so the total number of bits to return is N*ceil(log2(Y)). Then N*ceil (log2(Y)) bits are encoded and transmitted channels. Alternatively, the total number of effective return state types for the N CCs is YN, and can be represented by ceil(N*log2(Y)) bits. The ceil(N*log2(Y)) bits are then encoded and transmitted channels. Here, the method for encoding the channel can be convolution encoding, RM encoding, and the like. In fact, when Y is a power of 2, the above two methods are equivalent. Finally, the encoded channel bits can be transmitted, after being subjected to a subsequent process, in ACK/NACK channels (e.g., channel 2 or 3 of Physical Uplink Control Channel (PUCCH) format or others).
[0099] Still referring to step 103 of Figure 1, the feedback status for the individual CCs can be transmitted based on the channel selection method. Suppose Y return state types are returned with respect to each CC. Here, in defining a mapping table based on channel selection, if a return state type indicates that return information for the data of the first X downlink subframes that the UE receives is a combination of ACK and NACK, it can be determined that all ACK/NACK channels corresponding to data for the first X downlink subframes exist. If the data of each downlink subframe corresponds to at least one ACK/NACK channel, which is semi-statically configured for an SPS service, or is obtained via a PDCCH for a dynamically scheduled service, then the ACK/NACK information can be returned on X ACK/NACK channels based on channel selection. In this way, a mapping table based on channel selection for an AC system is defined. More particularly, for each combination of feedback information for the individual CCs, an ACK/NACK channel and a Quadrature Phase Shift Coding (QPSK) constellation point are selected to use available ACK/NACK channels corresponding to the return information combination.
[00100] To reduce the complexity in standardization, the 4-bit mapping table for Long Term Evolution-Advanced (LTE-A) of Flow Division Duplexing (FDD) can be multiplexed into LTE-A of Flow Division Duplexing. Time (TDD). Assume the total number of CCs is 2. In an FDD system, 2 bits of ACK/NACK information can be returned against each CC. In a TDD system, therefore, two bits of ACK/NACK information also need to be returned with respect to each CC, that is, the total number Y of return state types is equal to 4. In an FDD system , two ACK/NACK channels correspond to the two ACK/NACK bits for each CC. In a TDD system, therefore, two channels of ACK/NACK also need to be obtained for each CC.
[00101] More particularly, for the primary CC (PCC), in the absence of SPS service, the two ACK/NACK channels are obtained from the PDCCH for the downlink data with a DAI of 1. For example, assuming that the minimum SCC index of PDCCH is n, the two ACK/NACK channels can be obtained by mapping via an LTE method of SCC indices n+1. Alternatively, the ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 1 and the second ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 2. Alternatively, the ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 1 and for the second ACK/NACK channel, multiple candidate channels can be configured by the upper layer and ACK/NACK Resource Indicator (ARI) for PDCCHs of the Secondary CC (SCC) can be programmed to indicate a channel l effectively used, thus increasing flexibility in resource allocation. In case of SPS service, semi-statically configured ACK/NACK channels for SPS service can be used for channel selection. Here, two ACK/NACK channels can be semi-statically assigned to the SPS service by the upper layer, so that, as in the absence of SPS service, two ACK/NACK channels are available and no special processing is required. Alternatively, the upper layers configure, using an LTE method, only one semi-static ACK/NACK channel, which serves as the first ACK/NACK channel, and for the second ACK/NACK channel, multiple candidate channels can be used. be configured by the upper layer and the ARI for SCC PDCCHs can be programmed to indicate an actually used channel, thus increasing resource allocation flexibility. In another alternative, the upper layers configure, using an LTE method, only a semi-static ACK/NACK channel, which serves as the first ACK/NACK channel, and the ACK/NACK determined from the PDCCH to downlink data with a DAI of 1 serves as the second ACK/NACK channel.
[00102] For SCC scheduled traversal CC, in the absence of SPS service, the two ACK/NACK channels are obtained from the PDCCH for the downlink data with DAI of 1. For example, assuming the index of Minimum SCC of PDCCH is n, the two ACK/NACK channels can be obtained by mapping via an LTE method of SCC indices n and n + 1. Alternatively, the ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 1 and the second ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 2. Alternatively, the ACK/NACK channel can be determined from From the PDCCH to the downlink data with DAI of 1 and to the second channel of ACK/NACK , multiple candidate channels can be configured by the upper layer and the ARI for SCC PDCCHs can be programmed to indicate a channel actually used, thus increasing flexibility in resource allocation. For the SCC where no CC traversal programming is applied, the two ACK/NACK channels are configured by the upper layer, indicated by the IRA. More particularly, the multiple candidate channels are configured by the upper layer and the IRA for SCC PDCCHs are programmed to indicate two channels actually used, thus increasing the flexibility of resource allocation.
[00103] After the ACK/NACK channels are assigned according to the above methods, the two ACK/NACK channels for the PCC are denoted as channels 1 and 2, and the two ACK/NACK channels for the SCC are denoted as channel 3 and channel 4. Then a correspondence between the 4 types of return states for each CC and the two-bit ACK/NACK information types for each CC are further defined in a mapping table for FDD . For example, a mapping relationship, as shown in Figure 7, can be employed. In this way, the 4-bit mapping table for FDD can be multiplexed in a TDD system with the above method of channel selection and mapping relationship.
[00104] Figure 3 illustrates a 4-bit mapping table employed in an LTE-A FDD system in accordance with an exemplary embodiment of the present invention.
[00105] Referring to Figure 3, return state types can be defined for different values of M with one of the methods, as illustrated in Figures 4, 5 and 6, and the mapping relationship between return state types and Two-bit ACK/NACK information types for each CC in a mapping table for FDD can be employed, as shown in Figure 7.
[00106] Figure 7 illustrates a return state mapping relationship for 2 bits of ACK/NACK in an FDD table in accordance with an exemplary embodiment of the present invention.
[00107] Referring to Figure 7, a return state type 4), must be mapped to 2 bits (N, N), because both indicate return information from NACK or DRX, return state type 3) is mapped to 2 bits (A, N), which is determined from the 4-bit mapping table, as shown in Figure 3. In a TDD system, when the UE receives only a part of the data from the PCC's SPS, the UE has, in fact, only one ACK/NACK channel available semi-statically configured for the SPS service. To indicate the ACK/NACK response information in this case, the selected ACK/NACK channel is either this semi-statically configured ACK/NACK channel for the SPS service or an SCC ACK/NACK channel. Referring again to Figure 3, the above requirements are satisfied only when the feedback information for the PCC is (A,N), i.e. the selected ACK/NACK channel is either the initial ACK/NACK channel of the PCC or a corresponding SCC ACK/NACK channel. Next, the ACK/NACK channels are assigned according to one of the methods described above. Still referring to Figure 3, when the two bits for the SCC represent any of the combinations (A, N), (N, A) and (A, A), two SCC candidate channels need to be configured to support the selection of channel. Whereas the UE can only receive data of a downlink subframe with a DAI of 1 from the SCC, or the base station can actually only transmit data of a downlink subframe with a DAI of 1 through the SCC. Therefore, it is not possible to determine an ACK/NACK channel for downlink subframe data with a DAI of another channel and determine ACK/NACK for downlink subframe data with a DAI of 2. In contrast, channels of ACK / NACK may not be sufficient for channel selection. In conclusion, after the mapping of the return states is determined and the ACK/NACK channels to be used are assigned, the first and second ACK/NACK channels for the PCC are denoted as channels 1 and 2, respectively, and the first and second ACK/NACK channels for the SCC are denoted as channel 3 and channel 4, respectively, thereby fully multiplexing the 4-bit mapping table for FDD as shown in Figure 3.
[00108] In a 4-bit table for FDD, when return state types for PCell and Scell are either (N, N) or DRX, it can be identified that the return state type for PCell is which of (N, N) and XRD. Thus, in a TDD system, when return state types for PCell and Scell are both of return state type 4), there can be two different instances of return state type 4) for PCell. In the first case, no SPS service is applied and the UE can determine from the DAI that the PDCCH with a DAI of 1 has been lost, where the UE cannot have an ACK/NACK channel available. The second instance refers to the return information in a different instance from the first instance of the return state type 4). In the second case, more particularly, an SPS service is configured where the UE has at least one ACK/NACK channel available, or in the absence of SPS data, the UE has received scheduled dynamic data with respect to at least one PDCCH with DAI of 1, wherein the UE also has at least one ACK/NACK channel available. In this way, what corresponds to (N, N, N, N) and (N, N, D, D) in the table, as shown in Figure 3, the channel and constellation point indicate the second instance of the return state type 4) for PCell and return state types 4) for Scell. Regarding (D, D, N, N) and (D, D, D, D) in the table, as shown in Figure 3, the UE may not transmit any uplink signal, which indicates the first instance of the type of 4) return state for PCell and 4) return state types for Scell.
[00109] The exemplary implementation above has been described with reference to Figure 3. Hereafter, exemplary implementations will be described with reference to a 4-bit mapping table supporting the independent existence of 4 ACK/NACK channels, for example, the mapping table, as shown in Figure 12.
[00110] Figure 12 illustrates a 4-bit mapping table in accordance with an exemplary embodiment of the present invention.
[00111] Referring to Figure 12, the methods as illustrated in Figures 4, 5 and 6 can also be used to define return state types for different values of M, and to define a mapping relationship between the types of return state and two-bit ACK/NACK information types, the table as shown in Figure 07 may need to be extended, i.e. the interpretation of the return information N in Figure 3 as NACK or DRX, in order to get a mapping table as shown in Figure 13. Here, there can be two different instances of return state type 4) in Figure 13. In the first case, no SPS service is applied and the UE can determine from the DAI that the PDCCH with a DAI of 1 was lost, where the UE cannot have an ACK/NACK channel available at all, which corresponds to the return information (D, N/A) in the mapping table, as shown in Figure 12. The second instance refers to the return information in a different instance entity of the first instance of the return state type 4). In the second case, more particularly, an SPS service is configured where the UE has at least one ACK/NACK channel available, or in the absence of SPS data, the UE has received scheduled dynamic data with respect to at least one PDCCH with DAI of 1, wherein the UE also has at least one ACK/NACK channel available. In this way, after performing a mapping between the return state types and two-bit ACK/NACK information types according to Figure 13, the ACK/NACK information can be returned via the channel selection method. according to the 4-bit mapping table as shown in Figure 12.
[00112] Figure 13 illustrates a return state mapping relationship for 2 bits of ACK/NACK in accordance with an exemplary embodiment of the present invention.
[00113] Referring to Figure 13, return state type 4), must be mapped to 2 bits (N/A, N/A), because both indicate that the return information is NACK or DRX. In the mapping table, as shown in Figure 12, when the return state types of PCell and Scell are return state types 4), one can identify which type of return state of PCell is one of the two instances of type return status 4). When the return state type of PCell is the second occurrence of the return state type 4), a QPSK constellation point of the ACK/NACK channel that is present is used for uplink transmission. In the mapping table, as shown in Figure 12, this ACK/NACK channel corresponds to h0. In Figure 13, return state type 3) is mapped to 2 bits (A,N,/D). Return state type 3) indicates that, with respect to a CC, the UE can receive data only one subframe and thus has only one ACK/NACK channel available. For the PCC, for example, when the UE receives only a piece of SPS data from the PCC, only one semi-statically configured ACK/NACK channel for the SPS service is available. To transmit an uplink return signal, in this case, the UE selects either this semi-statically configured ACK/NACK channel for the SPS service or an SCC ACK/NACK channel as an ACK/NACK channel. According to the above analysis of return state type 4), this ACK/NACK channel corresponds to h0 in the mapping table, as shown in Figure 12, and h1 does not exist. Referring again to Figure 12, when the feedback information for the PCC is (A N, / D), the selected channel is h0 or an SCC channel (h2 or H3) and h1 is impossible. So return state type 3) needs to be mapped to both bits (A, N/A). Return state types 1 and 2) indicate that, with respect to a CC, the UE receives the data of at least two subframes and therefore has at least two ACK/NACK channels available. Therefore, the two pieces of mapped ACK/NACK information may not need to be constrained. In Figure 13, return state type 1) is mapped to (A, A) and return state type 2) is mapped to (N/A, A). In conclusion, after the mapping of the return states is determined and the ACK/NACK channels to be used are assigned, the first and second ACK/NACK channels for the PCC are denoted as channels 1 and 2, respectively, and the first and second ACK/NACK channels for the SCC are denoted as channel 3 and channel 4, respectively, thereby fully multiplexing the 4-bit mapping table for FDD as shown in Figure 12.
[00114] In addition, the channel selection method supporting CA for LTE-A TDD can still support support operation. More particularly, when the UE only receives data from the PCC, the method may be supported for LTE ACK/NACK multiplexing, where the number of downlink subframes in the grouping window is indicated as M, a piece of ACK/NACK information. NACK is obtained for each downlink subframe, an ACK/NACK channel is implicitly assigned for each downlink subframe in the grouping window, i.e. M channels are obtained implicitly, and the channel selection method is used to return the M pieces of ACK/NACK information. The channel selection mapping table as used herein may be a table defined in LTE, the table as shown in Figure 12, or others. According to the LTE method, the available ACK/NACK channels are implicitly obtained from the minimum SCC index of PDCCH for each subframe in the grouping window. When the UE receives subframe data from at least one SCC, the channel selection method supporting CA is employed. The channel assignment of ACK/NACK to the SCC may also employ the channel selection method described above. With respect to the ACK/NACK channel assignment for the PCC, one ACK/NACK channel for each subframe in the grouping window has already been used in the support operation. That is, a semi-statically configured ACK/NACK channel by the upper layer was used for subframe transmitting SPS data, or the ACK/NACK channel implicitly mapped from the minimum SCC index of the PDCCH was used for the dynamic data. In this way, by assigning the ACK/NACK channel to the PCC in the absence of SPS service, the ACK/NACK channel can be determined from the PDCCH for downlink data with DAI of 1.
[00115] However, the ACK/NACK channel mapped from the minimum SCC index of the PDCCH cannot be used, and the second ACK/NACK channel can be determined from the PDCCH for the downlink data with DAI of 2, but the ACK/NACK channel mapped from the minimum SCC index of the PDCCH cannot be used. Alternatively, the ACK/NACK channel can be determined from the PDCCH for downlink data with DAI of 1, but the ACK/NACK channel mapped from the minimum SCC index of the PDCCH cannot be used. For the second ACK/NACK channel, multiple candidate channels can be configured by the upper layer and the ARI for SCC PDCCHs can be programmed to indicate an actually used channel, thus increasing resource allocation flexibility. In another alternative, the two ACK/NACK channels are configured by the upper layer and indicated by IRA. More particularly, the multiple candidate channels are configured by the upper layer and the ARI for SCC PDCCHs can be programmed to indicate an actually used channel, thus increasing the flexibility of resource allocation. After assigning the ACK/NACK channel to the PCC in case of SPS service, the two ACK/NACK channels can be configured by the upper layer and indicated by IRA. More particularly, the multiple candidate channels are configured by the upper layer and the ARI for SCC PDCCHs can be programmed to indicate an actually used channel, thus increasing the flexibility of resource allocation. Alternatively, the first ACK/NACK channel is configured by the upper layer and indicated by an ARI. More particularly, the multiple candidate channels are configured by the upper layer and the ARI for SCC PDCCHs is programmed to indicate an actually used channel, thus increasing flexibility in resource allocation, and the second ACK/NACK channel can be determined from from the PDCCH to the downlink data with DAI of 1. However, the ACK/NACK channel mapped from the minimum SCC index of the PDCCH cannot be used.
[00116] Figure 14 is a block diagram illustrating an apparatus for returning data receiving status in accordance with an exemplary embodiment of the present invention.
[00117] Referring to Figure 14, a user equipment (UE) includes a duplexer 1400, a receive modem 1402, a message processor 1404, a controller 1406, a HARQ controller 1408, a message generator 1410, and a 1412 broadcast modem.
[00118] Duplexer 1400 transmits a transmit signal provided from the transmit modem through an antenna 1412 according to a duplexing scheme, and provides a receive signal from the antenna to the receive modem 1402.
[00119] Receive modem 1402 converts and demodulates a Radio Frequency (RF) signal supplied from duplexer 1400 into a baseband signal. Receive modem 1402 may include an RF processing block, a demodulation block, a channel decoding block, and the like. The RF processing block converts an RF signal provided by the duplexer 1400 into a baseband signal in accordance with the control of the controller 1406. The demodulation block may include a Fast Fourier Transform (FFT) operator, and the like, for extracting data loaded on each subcarrier of a given signal from the RF processing block. The channel decoding block may include a demodulator, a deinterleaver, a channel decoder, and the like.
[00120] The message processor 1404 extracts control information from a signal provided from the receiving modem 1402 and provides the control information to the controller 1406 which controls the operation of the UE.
[00121] Controller 1406 controls ACK/NACK feedback with respect to downlink data received for the base station (BS). Controller 1406 controls the transmission of receive state feedback information with respect to received downlink data to the BS in accordance with HARQ controller 1408.
[00122] HARQ controller 1408 sequences downlink subframes to transmit data to the UE with respect to each CC. The HARQ controller 1408 generates receive status feedback information for the first X downlink subframes with respect to each CC in accordance with the order of the downlink subframes, where X < M, M is the number of downlink subframes. downlink in DC. The HARQ controller 1408 controls to transmit the received status feedback information generated regarding each CC to the base station. In addition, the HARQ controller 1408 may perform first spatial grouping on the receive state feedback information for two codewords (CWS) in each downlink subframe. That is, the HARQ controller 1408 performs the operations necessary for transmitting the receive status feedback information to the BS, as described above with reference to Figures 1 to 13.
[00123] Message generator 1410 generates a control message to be ACK/NACK return as per controller control 1406.
[00124] The transmit modem 1412 encodes and converts the data to be transmitted to an MS and a control message provided from the message generator 1408, into an RF signal, and transmits the RF signal to the duplexer 1400. Transmission modem 1412 may include a channel coding block, a modulation block, an RF processing block, and the like. The channel encoding block may include a modulator, an interleaver, a channel encoder, and the like. The modulation block may include an Inverse Fast Fourier Transform (IFFT) operator, and the like, for mapping a signal provided from the channel encoding block to each subcarrier. The RF processing block converts a baseband signal provided from the modulation block into an RF signal, and outputs the RF signal to duplexer 1400.
[00125] As can be seen from the above description, exemplary embodiments of the present invention have the following advantages.
[00126] The UE sequences downlink subframes to transmit data with respect to each CC, generates receive state feedback information for the first X downlink subframes according to the sequencing result, and transmits the feedback information of receive state for each CC to the base station. Because the UE reports the receive state for only X downlink subframes, the base station can perform HARQ processing on the first X downlink subframes. For the last downlink subframes, the base station may execute a process, assuming that the UE does not receive the PDCCHs. Therefore, the base station can reach an agreement with the UE on the UE's receive state, ensuring that the UE will not skew the receive state for the downlink subframes due to inconsistencies with the base station between transmit and receive messages. return so that the HARQ transmission is affected. Furthermore, an exemplary embodiment of the present invention avoids the uplink headers occupied by the receive state return information and increases the uplink coverage area by reducing the number of receive state return information pieces.
[00127] In addition, the receive state feedback form can be flexibly changed according to the position of the downlink subframe with a DAI of 1 in the M downlink subframes, thus increasing to the greatest extent , the amount of receive state feedback information for each CC without increasing headers.
[00128] While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention as defined by the appended claims. and their equivalents.

权利要求:
Claims (2)
[0001]
1. Method for returning the state of receiving data, applied to a Long Term Evolution-Advanced LTE-A system, the method characterized by the fact that it comprises: sequencing, through a user equipment (UE), link subframes downstream to transmit data with respect to each Component Carrier (CC); generating receive state feedback information for the first X downlink subframes with respect to each CC according to the sequencing result, where X^M, where M is the number of downlink subframes in each CC; and transmitting the receiving status feedback information generated with respect to each CC to a base station, wherein generating the receiving status feedback information comprises: determining first receiving status-related feedback data for a cell primary in a plurality of subframes and second return information related to receiving status data for a secondary cell in the plurality of subframes, wherein transmitting the return receiving status information comprises: selecting, based on a selection method channel, a constellation point and an uplink channel resource corresponding to a combination of the first return information and the second return information, and transmit, on the uplink channel resource, information indicating the constellation point to the base station, where the uplink channel resource is selected from four uplink resources uplink including: a first uplink resource and a second uplink resource associated with the primary cell, and a third uplink resource and a fourth uplink resource associated with the secondary cell, wherein, for the primary cell, the first uplink resource is determined from a physical downlink control channel (PDCCH) with a downlink assignment index (DAI) being 1 and the second uplink resource is determined from a PDCCH with a DAI being 2, where, in the case of traversal scheduling for the secondary cell, the third uplink resource is determined from a PDCCH with a DAI being 1 and the fourth uplink resource is determined from a PDCCH with a DAI being 2, and where, in the case of no traversal scheduling to the secondary cell, the third uplink resource and the fourth uplink resource are determined ned by a top-tier configuration.
[0002]
2. Apparatus for return status of receiving data, applied to a Long Term Evolution-Advanced LTE-A system, the apparatus characterized in that it comprises: a user equipment (UE) for sequencing downlink subframes for transmission with respect to each Component Carrier (CC), to generate receive state feedback information for the first X downlink subframes with respect to each CC according to the sequencing result, where X < M, where M is the number of downlink subframes in each CC, and for transmitting the receive state feedback information generated with respect to each CC to a base station, wherein to generate the receive state feedback information, the UE is configured to: determine first downstream state related feedback for a primary cell in a plurality of subframes and related second feedback information aa receive state for a secondary cell in the plurality of subframes, wherein to transmit the receive state feedback information, the UE is configured to: select, based on a channel selection method, a constellation point and an uplink channel resource corresponding to a combination of the first return information and the second return information, and transmitting, on the uplink channel resource, information indicating the constellation point to the base station on which the resource uplink channel is selected from four uplink resources including: a first uplink resource and a second uplink resource associated with the primary cell, and a third uplink resource and a fourth uplink resource associated with the secondary cell, where, for the primary cell, the first uplink resource is determined from a channel of physical downlink control (PDCCH) with a downlink assignment index (DAI) being 1 and the second uplink resource is determined from a PDCCH with a DAI being 2, where in the case of traversal scheduling for the secondary cell, the third uplink resource is determined from a PDCCH with a DAI being 1 and the fourth uplink resource is determined from a PDCCH with a DAI being 2, and where, in the case of no traversal scheduling for the secondary cell, the third uplink resource and the fourth uplink resource are determined by a higher layer configuration.

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CN109845158B|2016-11-21|2021-11-12|富士通株式会社|Method, device and communication system for feeding back data transmission confirmation|

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US11251924B2|2017-07-25|2022-02-15|Lg Electronics Inc.|Method and apparatus for designing ACK/NACK channel in wireless communication system|

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CN110149173B|2018-02-13|2021-03-05|电信科学技术研究院有限公司|Semi-persistent scheduling transmission method, network side equipment and user terminal|

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WO2020082307A1|2018-10-25|2020-04-30|北京小米移动软件有限公司|Hybrid automatic repeat requestfeedback method and apparatus|

法律状态:
2018-12-26| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-03-17| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 1/16 , H04L 27/26 , H04B 7/26 Ipc: H04L 1/18 (2006.01), H04L 5/00 (2006.01) |

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2020-03-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-07-06| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|

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2021-07-13| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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2021-10-26| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2022-01-04| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/04/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |

优先权:

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申请号 | 申请日 | 专利标题

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CN201010168684.8|2010-04-30|

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CN201010168684|2010-04-30|

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CN201010527462|2010-10-27|

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CN201010527462.0|2010-10-27|

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CN201010574732|2010-11-16|

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CN201010574732.3|2010-11-16|

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CN201010589610.1A|CN102237992B|2010-04-30|2010-12-01|Method for feeding back data receiving status|

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CN201010589610.1|2010-12-01|

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PCT/KR2011/003163|WO2011136588A2|2010-04-30|2011-04-28|Apparatus and method for feeding back data receiving status|

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