JP2015216673A - Uplink response signal transmission method, base station, mobile station, and communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for a mobile station to feed back a response signal to a base station, using a small resource.SOLUTION: A base station transmits downlink data to a mobile station by using a primary component carrier (PCC) and a secondary component carrier (SCC), and the mobile station generates a response signal to the downlink data and transmits the signal to the base station. The mobile station receives downlink data from the base station (601); generates a response signal in response to the downlink data (602); selects an uplink resource for transmitting the response signal and a corresponding modulation code from predetermined resources, on the basis of a state of the response signal and whether the downlink data has been transmitted by a component carrier including the SCC or the downlink data has been transmitted by the PCC (603/605); and transmits the response signal by using the selected uplink resource and modulation code (604).

Description

  The present invention relates to a radio communication technique, and more particularly to an uplink response signal transmission method, a mobile station, a base station, and a communication system.

  In a Long Term Evolution (LTE) system, user equipment (UE) receives downlink data transmitted from a base station, and the user equipment UE decodes the downlink data and performs decoding. A base station acquires the response signal of downlink data based on the result, and transmits uplink control information including the response signal in a physical uplink control channel (PUCCH: Physical Uplink Control Channel), whereby the base station performs the uplink control. Based on the information, it is determined whether the data transmission is correct or incorrect, thereby determining whether it is necessary to retransmit the data. Here, the uplink control information includes a response signal used for downlink data, such as an acknowledgment (ACK) / negative acknowledgment (NACK) / discontinuous transmission (DTX) and channel. ACK indicates data correct reception, NACK indicates data error reception, etc., such as status information (CSI), DTX controls that the UE is not receiving any downlink control data, ie scheduling downlink data transmission Indicates that no signaling has been received.

  The response signals transmitted on the PUCCH correspond to one physical channel resource, one time domain sequence and one frequency domain sequence, respectively, and these three resources are related to two parameters. The first parameter is the same parameter N1 used together by the user equipment UE in all cells arranged in the upper layer of the system, and the other parameter schedules downlink data corresponding to the response signal This is related to the index of the first control channel element (CCE) included in the physical downlink control channel (PDCCH). Specifically, as shown in FIG. 1, N1 determines the origin position where the PUCCH transmitting the response signal in the uplink subframe is in the frequency domain, and the parameter is shared by all UEs or mobile stations in the cell. The first CCE index of the PDCCH refers to the origin location, and is scheduled on the PDCCH and actually used when the user equipment UE transmits uplink control signaling and Determine the sequence resource.

FIG. 2 is a diagram illustrating transmission timings of response signals in the LTE FDD (frequency division multiplexing) system. In the LTE FDD system, uplink subframes and downlink subframes have a one-to-one correspondence. In other words, any user equipment UE in the system transmits only one response signal value of the corresponding downlink subframe data in one uplink subframe. Data transmitted in one downlink subframe can include at most two transport blocks (TB), that is, have a response signal of 2 bits. The 2-bit response signal is first sent to QPSK (Quadrature) before transmission.
Phase Shift Keying: Modulates to a code, and then maps to the corresponding physical resource and sequence resource. The transmission timing of ACK / NACK in the LTE FDD system is shown in FIG.

  FIG. 3 is a diagram illustrating transmission timings of response signals in an LTE TDD (Time Division Multiplexing) system. In an LTE TDD (Time Division Multiplexing) system, seven types of uplink / downlink subframe arrangements are defined. In the arrangement of main subframes, uplink subframes and downlink subframes often correspond to each other in many cases. In other words, any user equipment UE in the system transmits response signal values of a plurality of downlink subframes corresponding thereto in one uplink subframe. The ACK / NACK transmission timing corresponding to a certain uplink / downlink subframe arrangement in the LTE TDD system is shown in FIG.

  Currently, the LTE TDD system employs a method called channel selection, which is a response signal corresponding to a plurality of downlink subframe data in one uplink subframe. The method includes the following steps. When the downlink subframe includes two transmission blocks (TB), the response signals of the two TBs are bundled, for example, after all the response signals are ACK, Becomes ACK, and in the opposite case, NACK. Thereafter, the code value after modulation and the corresponding physical resource and sequence resource are determined by a lookup table based on the response signal value after merging.

  Table 1 shows a response signal feedback method in which two downlink subframes correspond to one uplink subframe. As shown in Table 1, when the response signal detected by the user equipment UE in two subframes is (ACK, ACK), the user equipment UE in the first subframe is scheduled to perform downlink signal transmission. The lowest CCE index n1 of the PDCCH is selected to map uplink physical resources and sequence resources, and the modulation code value is -1. When the response signals corresponding to the two subframes are (ACK, NACK / DTX), the lowest CCE index n0 of the PDCCH of the 0th subframe is selected to map the uplink physical resource and sequence resource. The modulation code value is -j. Other channel selection methods are inferred from Table 1. In general, the number of resources required for channel selection is equal to the number of bits of the response signal. For example, when the response signal is 2/3/4 bits, 2/3/4 resources are provided for selection. There is a need.

Table 1: Channel selection method for 2-bit response signal in LTE system

  From the above, the LTE TDD system employs response signal bundling, and thus, available resources can be obtained from each downlink subframe including data transmission. For this reason, when the feedback response signal value maps to the resource, the resource is sufficient.

  In an LTE advanced (LTE-Advanced, LTE-A) system, data is transmitted using a carrier aggregation (CA) system. The downlink and uplink include a plurality of component carriers (CC), and uplink data transmission and downlink data transmission can be scheduled for mobile stations in the system in each component carrier. The system arranges one downlink primary component carrier (PCC: Primary Component Carrier) and a plurality of secondary component carriers (SCC: Secondary Component Carrier) for each user equipment UE. Each of the primary component carrier PCC and the secondary component carrier SCC can schedule data transmission in its own carrier.

  In the LTE-A system, any user equipment UE transmits control information corresponding to all downlink component carriers in the uplink primary component carrier PCC, for example, response signals of downlink component carrier data, downlink component carriers, and so on. Feedback of channel state information and so on. Similar to LTE TDD, the mobile station needs to feed back response signal values of data of a plurality of downlink subframes in the uplink subframe of one primary component carrier PCC. This downlink subframe belongs to a different downlink component carrier CC.

  However, in the process of realizing the present invention, the inventor has discovered the following drawbacks of the prior art. In the LTE-A system, when the carrier aggregation scheme is adopted, a resource corresponding to the primary component carrier PCC is installed in advance, so that when the base station transmits data using the secondary component carrier SCC, a single carrier request is used. Since the bundling method is not adopted, there is a risk of resource shortage.

  For example, when two component carriers, that is, one primary component carrier PCC and one secondary component carrier SCC are arranged in a certain mobile station and the transmission method of each component carrier is two TBs, four response signal values are fed back. Need to provide four resources to choose. On the other hand, in a normal case, resources corresponding to the primary component carrier PCC are arranged in advance. Thus, when mapping is performed using only the lowest CCE index of the PDCCH in each component carrier CC, the number of available resources is simply 2.

  There is currently no effective solution for resource shortages.

  References useful in the art for understanding the present invention are cited as follows and are incorporated herein by reference.

1) CN101594211A, date of publication 2009.12.02, the title of the invention is “Method of transmitting correct / incorrect response message in big broadband multi-carrier system”
2) CN10158226A, date of publication 2009. 11.25, the title of the invention is “terminal and response message transmission method in a big broadband multicarrier system”
3) WO2010 / 050688A2, METHOD
OF HARQ ACKNOWLEDGEMENT TRANSMISSION AND TRANSPORT BLOCK RETRANSMISSION IN A
WIRELESS COMMUNICATION SYSTEM.

  The embodiment of the present invention allocates a separate resource by the base station, so that the user equipment UE performs feedback of the response signal using the resource that is installed in advance and the resource that is allocated separately, and the response signal is transmitted with small consumption. The purpose is to provide feedback and solve the problem of resource shortage in the prior art.

  One aspect of an embodiment of the present invention is a method for transmitting an uplink response signal, in which a mobile station moves from a resource corresponding to a pre-configured primary component carrier (PCC) and a base station to the mobile station. Ability to select uplink resources to transmit response signals from available resources including resources allocated for downlink secondary component carrier (SCC) used for data transmission to the station Allocating resources based on the number of transmission blocks transmitting downlink data in the secondary component carrier, and in the mobile station, a response signal state set in advance based on the response signal state Mapping function to the selected resource To select an uplink resource for transmitting the response signal from the available resources, and in the mapping relationship, N / D (N indicates data error reception, and D indicates any downlink control data is received. The resource corresponding to the response signal is not selected, and if all of the response signals are N / D, no resource is selected. An uplink response signal transmission method is provided.

  In another aspect of an embodiment of the present invention, a method for transmitting an uplink response signal, the base station receiving downlink data transmitted by a downlink component carrier, and a component for transmitting downlink data When the carrier includes a secondary component carrier, from the resources corresponding to the pre-configured primary component carrier and the available resources including the resources allocated by the base station for the secondary component carrier, to the received downlink data Selecting an uplink resource for transmitting a corresponding response signal; and transmitting the response signal using the selected uplink resource, the response from the available resource Selecting an uplink resource for transmitting a signal to transmit the response signal according to a mapping relationship between a predetermined response signal state and a selected resource based on the response signal state. In the mapping relationship, N / D (where N indicates data error reception, D indicates that no downlink control data has been received, and distinguishes N from D). A resource corresponding to the response signal is not selected, and when all of the response signals are N / D, no resource is selected, and an uplink response signal transmission method is provided. .

  In another aspect of an embodiment of the present invention, a resource corresponding to a primary component carrier (Primary Component Carrier, PCC) preconfigured by a mobile station and a downlink secondary component carrier used for data transmission to the mobile station A transmission block for transmitting downlink data in the secondary component carrier so that an uplink resource for transmitting a response signal can be selected from available resources including resources allocated for (Secondary Component Carrier, SCC). Resource allocating means for allocating resources based on the number of resources, and in the mobile station, based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state, the utilization From the possible resources An uplink resource for transmitting an answer signal is selected, and in the mapping relationship, N / D (N indicates data error reception, D indicates that no downlink control data is received, and N and D And a resource corresponding to the response signal is not selected, and when all of the response signals are N / D, no resource is selected.

  In another aspect of the embodiment of the present invention, the data receiving means for receiving the downlink data transmitted by the base station by the downlink component carrier, and the component carrier for transmitting the downlink data include a secondary component carrier in advance. An uplink for transmitting a response signal corresponding to the received downlink data from available resources including resources allocated to the primary component carrier and resources allocated by the base station for the secondary component carrier First resource selection means for selecting a resource, and signal transmission means for transmitting the response signal using the selected uplink resource, the first resource selection means and the second resource selection means Based on the state of the response signal, an uplink resource for transmitting the response signal is selected according to a mapping relationship between a preset state of the response signal and a selected resource. / D (N indicates data error reception, D indicates that no downlink control data has been received, and N and D are not distinguished), and does not select a resource corresponding to the response signal Here, there is provided a mobile station characterized in that when all of the response signals are N / D, no resource is selected.

  In another aspect of the embodiments of the present invention, in a communication system including a base station and a mobile station, the base station is a resource corresponding to a primary component carrier (PCC) in which the mobile station is configured in advance. And uplink resources for transmitting response signals from available resources including resources allocated for downlink secondary component carrier (SCC) used for data transmission to the mobile station Resource allocation means for allocating resources based on the number of transmission blocks for transmitting downlink data in the secondary component carrier so that the mobile station can select, the mobile station transmitted by the base station by the downlink component carrier Downlink day When the component carrier for transmitting downlink data and the component carrier for transmitting downlink data include a secondary component carrier, the resource corresponding to the primary component carrier configured in advance and the resource allocated by the base station for the secondary component carrier First resource selection means for selecting an uplink resource for transmitting a response signal corresponding to the received downlink data from available resources, and the response signal using the selected uplink resource Signal transmission means for transmitting the resource, wherein the first resource selection means and the second resource selection means are configured to select a response signal state set in advance and a resource selected based on the response signal state. According to the mapping relationship And select an uplink resource for transmitting the response signal, and in the mapping relationship, N / D (N indicates data error reception, D indicates that no downlink control data is received) And N does not distinguish between N and D), and if all of the response signals are N / D, no resource is selected. A communication system is provided.

  The advantageous effect of the embodiment of the present invention is that the user equipment UE performs feedback of the response signal by using the resource installed in advance and the resource allocated separately by assigning the resource separately by the base station, and is small The response signal is fed back by consumption to solve the problem of resource shortage in the prior art.

  With reference to the following description and drawings, specific embodiments of the present invention have been disclosed in detail, and the manner in which the principles of the invention can be employed is shown. The embodiments of the present invention are not limited in scope. Various changes, modifications and equalizations may be made to the present invention without departing from the spirit and scope of the present invention which is limited to the scope of the claims.

  Features described and / or shown in one type of embodiment may be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or otherwise The features in the embodiment may be substituted.

  Note that in this text, the term “include / include” refers to the presence of a feature, an entire member, a process or a module, and does not exclude the presence or addition of one or more other features, an entire member, a process or a module.

The figure which shows the mapping of the uplink / downlink control channel of a LTE system. The figure which shows the transmission timing of the response signal of a LTE FDD system. The figure which shows the transmission timing of the response signal of a LTE TDD system. The flowchart of the uplink response signal transmission method which concerns on Example 1 of this invention. The flowchart of the uplink response signal transmission method which concerns on Example 2 of this invention. 9 is a flowchart of an uplink response signal transmission method according to Embodiment 3 of the present invention. The figure which shows the structure of the base station which concerns on Example 4 of this invention. The figure which shows the structure of the resource allocation part in FIG. The figure which shows the structure of the mobile station which concerns on Example 5 of this invention. The figure which shows the structure of the communication system which concerns on Example 6 of this invention.

  Various embodiments of the present invention will be described with reference to the drawings. These embodiments are merely illustrative and do not limit the invention. In order to better understand the principle and embodiment of the present invention, the embodiment of the present invention will be described by taking data transmission in the carrier aggregation scheme in the 3GPP LTE Advanced system as an example. In addition, this invention is not limited to a LTE Advanced system, You may apply to the multicarrier communication system which has a similar carrier aggregation function.

  FIG. 4 is a flowchart of an uplink response signal transmission method according to the first embodiment of the present invention. As shown in FIG. 4, the uplink response signal transmission method includes step 401 and step 402.

  In step 401, when transmitting data to a certain mobile station, the base station determines whether to transmit data to the mobile station using a downlink secondary component carrier (SCC). If the determination result is YES, step 402 is executed, and if the determination is opposite, step 403 is executed.

  In Step 402, when the determination result in Step 401 is YES, the resource corresponding to the primary component carrier (Primary Component Carrier, PCC) in which the mobile station is arranged in advance and the resource allocated for the secondary component carrier are used. Resources are allocated based on the number of transmission blocks transmitting downlink data in the secondary component carrier so that an uplink resource for transmitting a response signal can be selected.

  In a present Example, when a base station determines transmitting data using a downlink secondary component carrier SCC in step 401, there exists a possibility of a resource shortage. At this time, the base station allocates resources to the secondary component carrier SCC, so that the mobile station performs feedback of the response signal using the resources installed in advance and the resources allocated separately.

  In this embodiment, the method further includes step 403. If the determination result in step 401 is NO, it means that downlink data is transmitted using the primary component carrier. Since the resource corresponding to the primary component carrier PCC is set in advance, it is not necessary to allocate a separate resource in this case, and the mobile station uses the resource corresponding to the primary component carrier arranged in advance to feed back the response signal. It can be performed.

  According to the above embodiment, when the resource is insufficient, the base station allocates a separate resource, so that the mobile station performs feedback of the response signal using the resource installed in advance and the resource allocated separately. The response signal is fed back by consumption, and the problem of lack of resources in the prior art can be solved without breaking the characteristics of the uplink single carrier.

  FIG. 5 is a flowchart of an uplink response signal transmission method according to the second embodiment of the present invention. As shown in FIG. 5, the method includes steps 501 to 505.

  In step 501, when transmitting data to a certain mobile station, it is determined whether to transmit data to the mobile station using a downlink secondary component carrier SCC. When the determination result is YES, step 502 is executed, and when the determination result is reverse, step 5050 is executed.

  Here, the base station determines whether to transmit data to the mobile station using the downlink secondary component carrier SCC based on the channel quality signal transmitted by the mobile station, and adopts any conventional method Needless to say, this is realized.

  In step 502, if the determination result in step 501 is YES, a response signal is transmitted using the resource corresponding to the primary component carrier PCC in which the mobile station is allocated in advance and the resource allocated for the secondary component carrier SCC. Resources are allocated based on the number of transmission blocks TB that transmit downlink data in the secondary component carrier SCC so that uplink resources can be selected.

  Here, resources are allocated using the following method.

  First type: When the number of transmission blocks TB for transmitting downlink data is 1, a resource is selected from a first resource table set in advance. Each element in the first resource table includes one resource. Here, when the number of arranged transmission blocks TB is 1, and when the number of arranged transmission blocks TB is 2, the number of transmission blocks used when actually transmitting data is 1. It is included. For example, the first resource table set1 is shown in Table 1.

Table 1

Second type: When the number of transmission blocks for transmitting downlink data is 2, a resource is selected from a second resource table set in advance. Each element in the second resource table includes two resources. For example, the second resource table set2 is shown in Table 2.
Table 2

  In step 503, the base station transmits an index of the allocated resource to the mobile station.

  Here, the resource index may be transmitted to the mobile station in the physical downlink control channel PDCCH that schedules the downlink data of the secondary component carrier SCC.

  In step 504, the base station transmits downlink data to the mobile station using the primary component carrier PCC and the secondary component carrier SCC, so that the mobile station receives the downlink data, and then transmits the downlink data to the mobile station. Then, a corresponding response signal is obtained by performing a decoding process, and the response signal is fed back using a resource installed in advance and a resource allocated separately.

  In step 505, if the determination result in step 501 is NO, a resource corresponding to the primary component carrier PCC is preliminarily installed. In this case, it is not necessary to allocate a separate resource, and the primary component carrier PCC is adopted. The mobile station can perform feedback of the response signal by using the resources arranged in advance.

  According to the above embodiments, when the resource is insufficient, the base station allocates another resource based on the number of transmission blocks TB for transmitting data, and schedules the downlink data of the secondary component carrier SCC. The resource index is transmitted to the mobile station by the channel PDCCH, the mobile station acquires the allocated resource, performs feedback of a response signal using a resource that is allocated in advance and a resource that is allocated separately, and is small. The response signal is fed back by consumption, and the problem of lack of resources in the prior art can be solved without breaking the characteristics of the uplink single carrier.

  FIG. 6 is a flowchart of an uplink response signal transmission method according to Embodiment 3 of the present invention. As shown in FIG. 6, the method includes steps 601-605.

  In step 601, the base station receives downlink data transmitted by the downlink component carrier CC.

  In step 602, the received downlink data is decoded, and a response signal of the downlink data is obtained based on the decoding result.

  In step 603, if the component carrier transmitting the downlink data includes the secondary component carrier SCC, the uplink resource for transmitting the response signal is selected from the available resources, and the corresponding modulation code is selected. Good. Here, the available resources include resources corresponding to the primary component carrier PCC installed in advance and resources allocated by the base station for the secondary component carrier SCC.

  In step 604, the mobile station transmits the response signal using the selected uplink resource and modulation code. According to the above embodiment, when the resource is insufficient, the base station allocates another resource based on the number of transmission blocks TB for transmitting data, and assigns the index of the resource to the mobile station using the physical downlink control channel PDCCH. The mobile station performs feedback of the response signal using the resources installed in advance and the resource allocated separately, and performs feedback of the response signal with small consumption, thereby solving the problem of resource shortage in the prior art be able to.

  In this embodiment, in step 602, the response signal includes three types of signals, ACK, NACK, and DTX. Here, ACK (hereinafter referred to as A) indicates that data is received correctly, NACK (hereinafter referred to as N) indicates that data is received incorrectly, and DTX (hereinafter referred to as D). Indicates that no downlink control data has been received, i.e., none of the control signaling scheduling downlink data transmission has been received.

  In the present embodiment, in step 603, the base station transmits downlink data using the secondary component carrier SCC, so there is a risk of resource shortage. In this way, the base station allocates a separate resource to the secondary component carrier SCC, so that the mobile station selects an uplink resource for transmitting a response signal from the resource installed in advance and the allocated resource. Here, the separately allocated resource is a PUCCH resource.

  In this embodiment, in step 604, the mobile station transmits the response signal using the selected uplink resource and the corresponding modulation code. Here, the response signal may be transmitted in the resource selected by adopting the QPSK modulation method.

  In this embodiment, different response states are mapped depending on the uplink resource and the modulation code in the uplink resource. Thus, the mobile station can select the uplink resource and the corresponding modulation code based on the state of the response signal. Therefore, after the mobile station transmits the modulation code and the base station receives the modulation code, it can determine whether or not the transmitted downlink data is correctly received. This is similar to the prior art and will not be described.

  In this embodiment, when the base station allocates a separate resource to the secondary component carrier SCC, the base station transmits an index of the allocated resource to the mobile station. Thus, the method further comprises the step of the mobile station receiving an index of resources allocated by the base station for the secondary component carrier SCC transmitted by the base station.

  In this example, the method further includes step 605. In step 605, if the component carrier transmitting the downlink data is the primary component carrier PCC, an uplink resource for transmitting the response signal is selected from available resources, and a corresponding modulation code is selected. Here, the available resource includes a resource corresponding to a primary component carrier installed in advance.

  In the present embodiment, the following method may be adopted when selecting an uplink resource for transmitting a response signal using available resources in Step 603 and Step 605.

  Based on the state of the response signal, the uplink resource and modulation code for transmitting the response signal are selected according to the mapping relationship between the state of the response signal installed in advance and the selected resource and modulation code. The selected resource is one of the available resources.

  Here, in the mapping relationship, a resource corresponding to the response signal that is N / D is not selected, and N and D are not distinguished. Among them, N indicates data error reception, D indicates that no downlink control data is received, and if all of the response signals are N / D, no resource is selected.

  Here, a mapping relation table set in advance may be looked up based on the number of bits of the response signal. The number of selectable resources (number of available resources) and the number of bits of the response signal in the mapping relation table Is equivalent to Hereinafter, examples in which the response signal is 4 bits, 3 bits, and 2 bits will be described.

Type 1: Response signal is 4 bits The response signal of 4 bits includes the following cases.

1) Two CCs are arranged for the mobile station, and the transmission model arranged in each CC includes two TBs,
2) Three CCs are arranged for a mobile station, of which a transmission model arranged in one CC includes two TBs, and a transmission model arranged in the other two CCs includes one TB. Including
3) Four CCs are arranged for the mobile station, and the transmission models arranged in each CC both include one TB.

  In such a case, the number of resources that can be selected, that is, four resources are available. The relationship between the state of the response signal of the mobile station and selectable resources is shown in Table 3A, and the selectable resources are one or several of the available resources. For the 4-bit response signal, the mapping relationship table between the response signal state and the selected resource and modulation code is shown in Table 3B. The selected resource is an available resource (selectable resource). One of them.

Table 3A Selectable resources for 4-bit response signal

Table 3B 4-bit response signal mapping relationship table

  In the mapping relationships shown in Tables 3A and 3B, numbers 1 to 17 indicate 17 types of states corresponding to response signals, A indicates that data is correctly received, N indicates that data error is received, and D indicates Indicates that no downlink control data has been received, n0 to n3 indicate available resources, ie, available selection resources, and N / A indicates not applicable. Among them, A = ACK, N = NACK, D = DTX. In Table 3A and Table 3B, NACK and DTX are not distinguished. Taking state 4 (A, A, N / D, N / D) as an example, the response signals that can be included are (A, A, N, N), (A, A, N, D). , (A, A, D, N), (A, A, D, D).

  From the above, in each selectable state except for states 16 and 17, the response signal number corresponding to A and the resource number corresponding to A match. For example, in the state 10, the response signal numbers corresponding to A are 1 and 2, and the corresponding available resource numbers are 1 and 2 accordingly.

  In state 16, since only the first response signal is fixed N, only the first resource can be selected as the selected resource. Lines 16 and 17 may be merged into a state (N / D, N / D, N / D, N / D) and do not select any resources for mapping.

Type 2: Response signal is 3 bits The response signal of 3 bits includes the following cases.

1) Two CCs are arranged for a mobile station, a transmission model arranged in one CC includes two TBs, a transmission model arranged in another CC includes one TB,
2) Three CCs are arranged for the mobile station, and both transmission models arranged in each CC include one TB.

  In such a case, the number of resources that can be selected, that is, the number of available resources is three. The relationship between the state of the response signal of the mobile station and selectable resources is shown in Table 4A, and the selectable resources are one or several of the available resources. For the 3-bit response signal, a mapping relationship table between the response signal state and the selected resource and modulation code is shown in Table 4B. The selected resource is an available resource (selectable resource). One of them.

Table 4A 3-bit response signal selectable resources

Table 4B 3-bit response signal mapping relationship table

  Here, in the mapping relationship shown in Tables 4A and 4B, numbers 1 to 9 indicate the status corresponding to the response signal, A indicates that data is correctly received, N indicates that data error is received, and D indicates It displays that no downlink control data has been received, n0-n2 displays available resources, ie available selection resources, and N / A displays not applicable.

Type 3: Response signal is 2 bits Two CCs are arranged for the mobile station, and the transmission models arranged in each CC both include one TB.

  In such a case, the number of resources that can be selected, that is, two resources are available. The relationship between the state of the response signal of the mobile station and selectable resources is shown in Table 5A, and the selectable resources are one or several of the available resources. For the 2-bit response signal, the mapping relationship table between the response signal state and the selected resource and modulation code is shown in Table 5B, and the selected resource is an available resource (selectable resource). One of them.

Table 5A 2-bit response signal selectable resources

Table 5B 2-bit response signal mapping relationship table

  Here, in the mapping relationship shown in Tables 5A and 5B, numbers 1 to 5 indicate the status corresponding to the response signal, A indicates that the data is correctly received, N indicates that the data error is received, and D indicates It indicates that no downlink control data has been received, n0 to n1 indicate available resources, that is, available selection resources, and N / A indicates not applicable.

  In the present embodiment, the following method may be adopted when selecting an uplink resource for transmitting a response signal using available resources in Step 603 and Step 605.

  Based on the state of the response signal, the uplink resource and modulation code for transmitting the response signal are selected according to the mapping relationship between the state of the response signal installed in advance and the selected resource and modulation code. The selected resource is one of the available resources.

  Here, the resource corresponding to the response signal which is N / D is not selected in the mapping relationship. N and D are not distinguished, of which N indicates data error reception and D indicates that no downlink control data has been received. If all of the response signals are N / D, no resource is selected.

  Further, when data is transmitted only in the primary component carrier PCC, no matter how many component carriers CC are arranged for the mobile station, it corresponds to the LTE resource mapping scheme, that is, the lowest CCE of the PDCCH in the primary component carrier PCC. Map by index.

  Hereinafter, in accordance with the mapping principle described above, the case of arranging the mapping relationship of the 4-bit response signal, 2CC, 3CC and 4CC, and the case of arranging the mapping relationship of the 3-bit response signal, 2CC and 3CC will be described To do.

First type: 4-bit response signal When the response signal is 4 bits and two CCs are arranged for the mobile station, and the transmission model arranged in each CC includes two TBs, the mobile station Selectable resources are shown in Table 6A and mapping relationships are shown in Table 6B.

Table 6A 2CC, 4-bit response signal selectable resources

  For the mapping relationship shown in Table 6B, a resource corresponding to a response signal that is N / D is not selected. When the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used. This is because two TBs are arranged for this CC, but when only one TB is actually sent, the second response signal is set to be NACK, that is, the resource corresponding to this NACK is Because there will be no.

  Also, assuming that CC1 in Table 6A is the primary component carrier PCC, the fourth, eighth, twelfth, and sixteenth rows in Table 6A select the first CCE index of that PDCCH, that is, n0 to select the resource. Mapping must be done. Other response signal states cannot use n0 as a selected resource.

Table 6B 2CC 4-bit response signal mapping relationship table

  Here, in the mapping relationships shown in Tables 6A and 6B, numbers 1 to 17 are states corresponding to response signals. A indicates data correct reception, N indicates data error reception, and D indicates that no downlink control data has been received. n0 to n3 indicate available resources, that is, available selection resources, and N / A indicates non-applicability.

Second type: 4-bit response signal The response signal is 4 bits and three CCs are arranged for the mobile station, and the transmission model arranged in one CC includes two TBs, and another 2 When the transmission model arranged in one CC includes one TB, the resources that can be selected by the mobile station are shown in Table 7A, and the mapping relationship is shown in Table 7B.

Table 7A 4-bit response signal selectable resources

  In the mapping relationship shown in Table 7A, a resource corresponding to a response signal that is N / D is not selected. When the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used. This is because two TBs are arranged for this CC, but when only one TB is actually sent, the second response signal is set to be NACK, that is, the resource corresponding to this NACK is Because there will be no.

  In addition, when the PCC includes two TBs, CC1 in Table 7A becomes the primary component carrier PCC and follows the above-described principle. That is, it is necessary to perform resource mapping by selecting n0. Other response signal states cannot use n0 as a selected resource.

  When the primary component carrier PCC includes one TB, CC3 in Table 7A becomes PCC, and in accordance with the principle described above, state 17 is added to Table 7A, that is, (D, D, N / D, N). In state 15, resource mapping is performed using the first CCE index of the PDCCH for transmitting this TB of the primary component carrier PCC, that is, n3.

Table 7B 3CC 4-bit response signal mapping relationship table

  Here, in the mapping relationship shown in Tables 7A and 7B, numbers 1 to 18 indicate the number of states corresponding to the response signal. A indicates data correct reception, N indicates data error reception, and D indicates that no downlink control data has been received. n0 to n3 indicate available resources, that is, available selection resources, and N / A indicates non-applicability.

Third type: 3-bit response signal The response signal is 3 bits, and two CCs are arranged for the mobile station, and the transmission model arranged in one CC includes two TBs and another one When the transmission model arranged in one CC includes one TB, the resources that can be selected by the mobile station are shown in Table 8A, and the mapping relationship is shown in Table 8B.

Table 8A 2CC, selectable resources of 3 bit response signal

  For the mapping relationship shown in Table 8A, a resource corresponding to a response signal of N / D is not selected. When the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used. This is because two TBs are arranged for this CC, but when only one TB is actually sent, the second response signal is set to be NACK, that is, the resource corresponding to this NACK is Because there will be no.

  In addition, when the PCC includes two TBs, CC1 in Table 8A becomes PCC and follows the above-described principle. Must be selected to perform resource mapping. Other response signal states cannot use n0 as a selected resource.

  When the PCC includes one TB, CC2 in Table 8A becomes PCC, and in accordance with the above-mentioned principle, states 7 and 9 in Table 8A are the first CCE index of PDCCH for transmitting this TB of PCC, That is, resource mapping is performed using n3.

Table 8B 2CC 3-bit response signal mapping relationship table

  Here, in the mapping relationship shown in Tables 8A and 8B, numbers 1 to 10 are the number of states corresponding to the response signal. A indicates data correct reception, N indicates data error reception, and D indicates that no downlink control data has been received. n0 to n2 indicate available resources, that is, available selection resources. N / A indicates not applicable.

According to the above embodiment, when the resource is insufficient, the base station allocates another resource based on the number of transmission blocks TB for transmitting data, and assigns the index of the resource to the mobile station using the physical downlink control channel PDCCH. By transmitting, the mobile station performs feedback of the response signal using the resources installed in advance and the resource allocated separately, performs the feedback of the response signal with small consumption, without breaking the characteristics of the single carrier, The problem of insufficient resources in the prior art can be solved.
Note that all or some of the steps in the method of the above-described embodiment can be completed by executing related hardware using a program. The program is stored in a computer-readable storage medium, and when the program is executed, the program may include all or some of the steps in the method of the above-described embodiment. An optical disk may be included.

  As described in the following embodiments, embodiments of the present invention further provide base stations and mobile stations. Since the principle of problem solving of the base station and mobile station is similar to the uplink transmission method based on the base station and mobile station described above, the implementation of the base station and mobile station may refer to the implementation of the method, The description of the overlapping part is omitted.

  FIG. 7 is a diagram illustrating the configuration of the base station according to the fourth embodiment of the present invention. As shown in FIG. 7, the base station includes a determination unit 701 and a resource allocation unit 702. The determining unit 701 determines whether to transmit data to the mobile station using a downlink secondary component carrier. When the determination result of the determination unit 701 is YES, the resource allocation unit 702 transmits a response signal using the resource corresponding to the primary component carrier in which the mobile station is allocated in advance and the resource allocated for the secondary component carrier Resources can be allocated based on the number of transmission blocks transmitting downlink data in the secondary component carrier.

  As shown in FIG. 7, the base station further includes an information transmission unit 703, and the information transmission unit 703 transmits the index of the resource allocated by the resource allocation unit 702 to the mobile station. The resource index may be transmitted to the mobile station on the physical downlink control channel PDCCH that schedules data transmission, but the present invention is not limited to this, and another scheme may be adopted for transmission.

  According to the above embodiment, there is a risk of resource shortage when data is transmitted by the secondary component carrier. In this way, the base station allocates a separate resource based on the number of transmission blocks TB for transmitting data, and transmits the resource index to the mobile station through the physical downlink control channel PDCCH. The response signal is fed back using the installed resource and the separately allocated resource, and the response signal is fed back with small consumption, thereby solving the problem of resource shortage in the prior art.

  FIG. 8 is a diagram showing the configuration of the resource allocation unit in FIG. As shown in FIG. 8, the resource allocation unit 702 includes a first resource allocation unit 801 and a second resource allocation unit 802. When the number of transmission blocks for transmitting downlink data is 1, the first resource allocation unit 801 selects a resource from a previously installed first resource table. Each element in the first resource table includes one resource. When the number of transmission blocks for transmitting downlink data is 2, the second resource allocation unit 802 selects a resource from a previously installed second resource table. Each element in the second resource table includes two resources.

  Since the first resource table and the second resource table are shown in Tables 1 and 2, the description thereof is omitted here.

  In addition, the base station may further include a storage unit (not shown) that stores Tables 1 and 2 installed in advance. The resources in Tables 1 and 2 are shared by all mobile stations. The base station may further include a data transmission unit (not shown) for transmitting downlink data to the mobile station using a component carrier.

  FIG. 9 is a diagram illustrating the configuration of the mobile station according to the fifth embodiment of the present invention. As shown in FIG. 9, the mobile station includes a data reception unit 901, a data processing unit 902, a first resource selection unit 903, and a signal transmission unit 904. The data reception unit 901 receives downlink data transmitted by the base station using a downlink component carrier. The data processing unit 902 decodes the received downlink data, and obtains a downlink data response signal based on the decoding result. When the component carrier that transmits downlink data includes a secondary component carrier, the first resource selection unit 903 selects an uplink resource for transmitting a response signal from available resources, and selects a corresponding modulation code To do. Here, the available resources include resources corresponding to primary component carriers installed in advance and resources allocated by the base station for secondary component carriers. The signal transmission unit 904 transmits a response signal using the selected uplink resource and the corresponding modulation code.

  In this embodiment, different response states are mapped depending on the uplink resource and the modulation code in the uplink resource. Thus, the mobile station can select the uplink resource and the corresponding modulation code based on the state of the response signal. Therefore, after the mobile station transmits the modulation code and the base station receives the modulation code, it can determine whether or not the transmitted downlink data is correctly received. This is similar to the prior art and will not be described.

  As shown in FIG. 9, the mobile station may further include an information receiving unit 905 that receives an index of a resource allocated by the base station for the secondary component carrier transmitted by the base station.

  As shown in FIG. 9, the mobile station further includes a second resource selection unit 906. When the component carrier that transmits downlink data is a primary component carrier, the second resource selection unit 906 selects an uplink resource for transmitting a response signal from the available resources, and a corresponding modulation code Select.

  In the above-described embodiment, the first resource selection unit 905 and the second resource selection unit 906 map the response signal state and the selected resource and modulation code based on the response signal state. The uplink resource and modulation code for transmitting the response signal are selected according to the relationship. Here, the selected resource is one of the available resources.

  Note that the mapping relationship does not select a resource corresponding to the response signal of N / D, does not distinguish between N and D, where N indicates data error reception, and D indicates any downlink control. Displays that no data has been received. If all of the response signals are N / D, no resource is selected. Note that the available resources shown in Tables 3A, 4A, and 5A may be selected based on the response signal state.

  Preferably, as described above, the mapping relation table shown in Tables 3B, 4B, and 5B may be adopted to select the uplink resource and the corresponding modulation code, and the description thereof is omitted here.

  Specifically, the first resource selection unit 905 transmits the response signal based on the mapping relationship between the state of the response signal set in advance and the selected resource and modulation code based on the state of the response signal. To select an uplink resource and a modulation code.

  Note that the resource corresponding to the response signal of N / D is not selected for the mapping relationship. When the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used.

  Regardless of how many CCs are allocated to a mobile station, when data is transmitted only in the PCC, mapping must be performed according to the LTE resource mapping method, that is, mapping is performed by the lowest CCE index of the PDCCH in the PCC.

  The response signal in which 2CC and 4 bits are arranged may use the available resources in Table 6A, and preferably selects an uplink resource using the mapping relationship in Table 6B. The response signal in which 3CC and 4 bits are arranged may use the available resources in Table 7A, and preferably selects an uplink resource using the mapping relationship in Table 7B. The response signal in which 2CC and 3 bits are arranged may use the available resources in Table 8A, and preferably selects an uplink resource using the mapping relationship in Table 8B.

  In addition, the mobile station may further include a storage unit 907 for storing pre-installed resources and allocated resources.

  According to the above embodiment, there is a risk of resource shortage when data is transmitted by the secondary component carrier. In this way, the base station allocates a separate resource based on the number of transmission blocks TB for transmitting data, and transmits the resource index to the mobile station through the physical downlink control channel PDCCH. The response signal is fed back using the installed resource and the separately allocated resource, and the response signal is fed back with small consumption, thereby solving the problem of resource shortage in the prior art.

  FIG. 10 is a diagram illustrating a configuration of a communication system according to the sixth embodiment of the present invention. As shown in FIG. 10, the communication system includes a base station 1001 and a mobile station 1002.

  The base station 1001 may adopt the base station according to the fourth embodiment, and the mobile station 1002 may adopt the mobile station according to the fifth embodiment, and the description thereof is omitted here.

  According to the above embodiment, when the base station transmits data using the secondary component carrier, there is a risk of resource shortage. In this way, the base station allocates a separate resource based on the number of transmission blocks TB for transmitting data, and transmits the resource index to the mobile station through the physical downlink control channel PDCCH. The response signal is fed back using the installed resource and the separately allocated resource, and the response signal is fed back with small consumption, thereby solving the problem of resource shortage in the prior art.

  The embodiment of the present invention further provides a computer readable program. When the program is executed in the base station, the program causes the computer to execute the uplink response signal transmission method according to the first embodiment or the second embodiment in the base station.

  The present invention further provides a storage medium for storing a computer-readable program. The computer-readable program causes the computer to execute the uplink response signal transmission method according to the first embodiment or the second embodiment in the base station.

  The embodiment of the present invention further provides a computer readable program. When the program is executed in the mobile station, the program causes the computer to execute the uplink response signal transmission method according to the third embodiment in the mobile station.

  The embodiment of the present invention further provides a storage medium storing a computer-readable program. The computer-readable program causes the computer to execute the uplink response signal transmission method according to the third embodiment in the mobile station.

  The above apparatus and method of the present invention may be realized by hardware, or may be realized by combining hardware and software. The present invention relates to a computer-readable program. When the program is executed by a logic unit, the logic unit realizes the above-described apparatus or configuration requirements, or the logic unit realizes various methods or steps described above. Can be made. The present invention relates to a storage medium for storing the above program, such as a hard disk, a disk, an optical disk, a DVD, a flash memory, and the like.

  Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and principle of the present invention, and these changes and modifications are also within the scope of the present invention.

Claims (17)

A method for transmitting an uplink response signal, comprising:
Resource corresponding to a primary component carrier (Primary Component Carrier, PCC) configured in advance by the mobile station and a downlink secondary component carrier (Secondary Component Carrier, SCC) used for data transmission from the base station to the mobile station Allocate resources based on the number of transmission blocks transmitting downlink data in the secondary component carrier so that uplink resources for transmitting a response signal can be selected from available resources including resources allocated for Steps, including
In the mobile station, an uplink resource for transmitting the response signal from the available resource based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state Is selected,
In the mapping relationship, a resource corresponding to the response signal which is N / D (N indicates data error reception, D indicates that no downlink control data is received, and N and D are not distinguished) No uplink resource is selected, and no resource is selected when all of the response signals are N / D. After allocating resources based on the number of transmission blocks transmitting downlink data in the secondary component carrier, the uplink response signal transmission method includes:
The method of claim 1, further comprising: transmitting an allocated resource index to the mobile station. Allocating resources based on the number of transmission blocks transmitting downlink data in the secondary component carrier,
When the number of transmission blocks transmitting downlink data is 1, the step of selecting a resource from a preset first resource table, wherein each element in the first resource table includes one resource , Step and
When the number of transmission blocks for transmitting downlink data is 2, a step of selecting a resource from a preset second resource table, wherein each element in the second resource table includes two resources The uplink response signal transmission method according to claim 1 or 2, further comprising:   The step of transmitting the allocated resource index to the mobile station includes the allocated resource index in a physical downlink control channel (PDCCH) that schedules the downlink data of the secondary component carrier. The uplink response signal transmission method according to claim 2, further comprising a step of transmitting a message to the mobile station. A method for transmitting an uplink response signal, comprising:
Receiving downlink data transmitted by a base station via a downlink component carrier;
When the component carrier that transmits the downlink data includes a secondary component carrier, from the resources corresponding to the pre-configured primary component carrier and the available resources including the resources allocated by the base station for the secondary component carrier, Selecting an uplink resource for transmitting a response signal corresponding to the received downlink data;
Transmitting the response signal using the selected uplink resource, and
Selecting an uplink resource for transmitting the response signal from the available resources;
Selecting an uplink resource for transmitting the response signal according to a mapping relationship between a predetermined response signal state and a selected resource based on the state of the response signal;
In the mapping relationship, a resource corresponding to the response signal which is N / D (N indicates data error reception, D indicates that no downlink control data is received, and N and D are not distinguished) The uplink response signal transmission method is characterized in that no resource is selected when no response is selected and all of the response signals are N / D.   Before receiving the downlink data transmitted by the base station by the downlink component carrier, the uplink response signal transmission method is allocated by the base station for the secondary component carrier transmitted by the base station. The method of claim 5, further comprising: receiving an index of the received resource.   When the component carrier for transmitting downlink data is a primary component carrier, the uplink response signal transmission method transmits the response signal from available resources including resources corresponding to a preconfigured primary component carrier. The method of claim 5, further comprising selecting an uplink resource for the uplink response signal. Selecting an uplink resource for transmitting the response signal from the available resources;
Selecting an uplink resource for transmitting the response signal based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state; A resource is one of the available resources;
In the mapping relationship, a resource corresponding to the response signal that is N / D is not selected,
If the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used,
When data is transmitted only in the primary component carrier, mapping is performed using the lowest control channel element (CCE) index of the physical downlink control channel (PDCCH) in the primary component carrier according to the LTE resource mapping method. The uplink response signal transmission method according to claim 5. Allocation for resources corresponding to preconfigured primary component carriers (Primary Component Carrier, PCC) and downlink secondary component carriers (SCC) used for data transmission to the mobile station Resource allocating means for allocating resources based on the number of transmission blocks for transmitting downlink data in the secondary component carrier so that an uplink resource for transmitting a response signal can be selected from available resources including the allocated resources Including,
In the mobile station, an uplink resource for transmitting the response signal from the available resource based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state Is selected,
In the mapping relationship, a resource corresponding to the response signal which is N / D (N indicates data error reception, D indicates that no downlink control data is received, and N and D are not distinguished) Is not selected, and when all of the response signals are N / D, no resource is selected.   The base station according to claim 9, further comprising information transmission means for transmitting an index of the resource allocated by the resource allocation means to the mobile station. The resource allocating means includes:
When the number of transmission blocks for transmitting downlink data is 1, a first resource allocation unit that selects a resource from a preset first resource table, wherein each element in the first resource table is: A first resource allocation means including one resource;
When the number of transmission blocks for transmitting downlink data is 2, second resource allocation means for selecting a resource from a preset second resource table, wherein each element in the second resource table is The base station according to claim 9 or 10, further comprising second resource allocation means including two resources.   The information transmission unit transmits an index of the allocated resource to the mobile station in a physical downlink control channel (PDCCH) for scheduling the downlink data of the secondary component carrier. The listed base station. Data receiving means for receiving downlink data transmitted by the base station via a downlink component carrier;
When the component carrier that transmits the downlink data includes a secondary component carrier, from the resources corresponding to the pre-configured primary component carrier and the available resources including the resources allocated by the base station for the secondary component carrier, First resource selection means for selecting an uplink resource for transmitting a response signal corresponding to the received downlink data;
Signal transmission means for transmitting the response signal using the selected uplink resource,
The first resource selection unit and the second resource selection unit transmit the response signal based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state. Select the uplink resource to
Corresponds to the response signal N / D (N indicates data error reception, D indicates that no downlink control data is received, and does not distinguish between N and D) in the mapping relationship. No mobile resource is selected, and when all of the response signals are N / D, no resource is selected.   The mobile station according to claim 13, further comprising information receiving means for receiving an index of a resource allocated by the base station for the secondary component carrier transmitted by the base station.   When a component carrier that transmits downlink data is a primary component carrier, the uplink carrier for transmitting the response signal is selected from available resources including resources corresponding to the primary component carrier configured in advance. The mobile station according to claim 13, further comprising two resource selection means. The first resource selection unit selects an uplink resource for transmitting the response signal based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state And
The selected resource is one of the available resources;
In the mapping relationship, a resource corresponding to the response signal that is N / D is not selected,
If the second response signal belonging to the same component carrier is N, the resource corresponding to the response signal N is not used,
When data is transmitted only in the primary component carrier, mapping is performed using the lowest control channel element (CCE) index of the physical downlink control channel (PDCCH) in the primary component carrier according to the LTE resource mapping method. The mobile station according to claim 13. In a communication system including a base station and a mobile station,
The base station
For the resource corresponding to a primary component carrier (Primary Component Carrier, PCC) configured in advance by the mobile station and a downlink secondary component carrier (Secondary Component Carrier, SCC) used for data transmission to the mobile station Resource allocation for allocating resources based on the number of transmission blocks for transmitting downlink data in the secondary component carrier so that an uplink resource for transmitting a response signal can be selected from available resources including the allocated resource Means, and
The mobile station
Data receiving means for receiving downlink data transmitted by the base station via a downlink component carrier;
When the component carrier that transmits the downlink data includes a secondary component carrier, from the resources corresponding to the pre-configured primary component carrier and the available resources including the resources allocated by the base station for the secondary component carrier, First resource selection means for selecting an uplink resource for transmitting a response signal corresponding to the received downlink data;
Signal transmission means for transmitting the response signal using the selected uplink resource,
The first resource selection unit and the second resource selection unit transmit the response signal based on a mapping relationship between a preset response signal state and a selected resource based on the response signal state. Select the uplink resource to
Corresponds to the response signal N / D (N indicates data error reception, D indicates that no downlink control data is received, and does not distinguish between N and D) in the mapping relationship. No communication resource is selected, and when all of the response signals are N / D, no resource is selected.

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