JP5052599B2 - Delivery confirmation information transmission method, base station apparatus, and user apparatus - Google Patents

Description

  The present invention relates to the technical field of mobile communication, and particularly to a delivery confirmation information transmission method, a base station apparatus, and a user apparatus in a mobile communication system using a next generation mobile communication technique.

  Long term evolution (LTE) is a long term evolution (LTE) that succeeds wideband code division multiple access (W-CDMA), high-speed downlink packet access (HSDPA), high-speed uplink packet access (HSUPA), etc. ) Is being studied by the W-CDMA standardization body 3GPP. As the LTE radio access scheme, an orthogonal frequency division multiplexing (OFDM) scheme is used in the downlink, and a single carrier frequency division multiple access (SC-FDMA) scheme is used in the uplink. The method is considered promising (see Non-Patent Document 1, for example).

  The OFDM scheme is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each subcarrier. It can be expected that high-speed transmission can be realized by increasing the frequency utilization efficiency by arranging subcarriers densely while being orthogonal to each other on the frequency axis.

  The SC-FDMA scheme is a single carrier transmission scheme in which a frequency band is divided for each terminal, and transmission is performed using different frequency bands among a plurality of terminals. In addition to being able to reduce interference between terminals easily and effectively, the variation in transmission power can be reduced, so this method is preferable from the viewpoint of reducing the power consumption of terminals and expanding the coverage.

  In the LTE system, communication is performed by allocating one or more resource blocks to a mobile station in both downlink and uplink. Resource blocks are shared by many mobile stations in the system. The base station apparatus determines to which mobile station a resource block is allocated among a plurality of mobile stations every subframe (1 ms in LTE, which may be referred to as TTI (Transmission Time Interval)). This process is called scheduling. In the downlink, the base station apparatus transmits a shared channel in one or more resource blocks to the mobile station selected by scheduling. In the uplink, the selected mobile station transmits a shared channel in one or more resource blocks to the base station apparatus.

  The downlink shared channel is called a physical downlink shared channel (PDSCH), and the uplink shared channel is called a physical uplink shared channel (PUSCH). Also, the transport channel is called DL-SCH (Downlink Shared Channel) in the downlink, and is called UL-SCH (Uplink Shared Channel) in the uplink.

  In each subframe, information on which mobile station uses which shared channel to communicate is notified from the base station apparatus to the mobile station using the downlink control channel. This downlink control channel is called a physical downlink control channel (PDCCH) or a downlink L1 / L2 control channel (DL L1 / L2 control channel). Notification of information regarding which mobile station performs communication using the shared channel is performed using the physical downlink control channel for each of the downlink and the uplink (see, for example, Non-Patent Document 2).

  In the LTE MAC layer, hybrid automatic repeat request (HARQ) is applied in both downlink and uplink. For example, in the downlink, the mobile station transmits the acknowledgment information (Acknowledgement Information) on the uplink based on the CRC check result of DL-SCH. The base station apparatus performs retransmission control according to the contents of the delivery confirmation information. The contents of the delivery confirmation information are expressed by either an acknowledgment (ACK) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK) indicating that it has not been properly received.

  In the LTE system, the physical resource to which the acknowledgment information is mapped depends on whether uplink user data (that is, the uplink shared channel) is also transmitted at the same time when the acknowledgment information is transmitted. Different. That is, when the mobile station transmits an uplink shared channel, the acknowledgment information is time-multiplexed with the uplink shared channel and transmitted, and when the mobile station does not transmit the uplink shared channel, Transmission using a physical uplink control channel (PUCCH) positioned at both ends of the system band has been studied (for example, see Non-Patent Document 3).

  Next, the repetition (repetition) of the delivery confirmation information with respect to a downlink shared channel is demonstrated.

  In LTE, it is considered to perform repetition when transmitting acknowledgment information for a downlink shared channel. That is, when transmitting delivery confirmation information for the downlink shared channel, it has been studied to transmit the delivery confirmation information across a plurality of subframes (see, for example, Non-Patent Document 4). For example, in a cell having a large cell radius such as a suburb, it is conceivable that sufficient transmission characteristics cannot be obtained when transmission confirmation information is transmitted in only one subframe due to the limitation of the maximum transmission power of the mobile station. In such a case, there is an advantage of improving the transmission characteristics of the delivery confirmation information by transmitting the delivery confirmation information over a plurality of subframes.

  FIG. 1A and FIG. 1B show the time relationship between the processing of the mobile station and the base station apparatus when the repetition factor of the delivery confirmation information is 1 and 2. Here, the repetition factor (repetition factor) corresponds to the number of subframes when transmission confirmation information is transmitted over one or more subframes.

In FIG. 1A, the base station apparatus 200 uses the physical downlink control channel in the #i subframe, the ID of the user communicating on the PDSCH in the subframe #i, the information on the transport format of the user data, That is, downlink scheduling information is notified to the mobile station 100 _n (S101). The mobile station 100 _n receives the physical downlink control channel in the #i subframe, and the user ID (the ID of the user who performs communication using the PDSCH in the subframe #i) is included in the physical downlink control channel. In the case of the ID of the own station, the PDSCH is received based on the transport format information included in the physical downlink control channel.

Upon receiving the PDSCH, the mobile station 100 _n transmits delivery confirmation information based on the CRC check result using the uplink control channel of subframe # i + 3 (S103). This figure shows an example in which uplink shared channel transmission is not performed in subframe # i + 3. That is, the delivery confirmation information is transmitted on physical uplink control channels (PUCCH) located at both ends of the system band. In subframe # i + 3, base station apparatus 200 performs reception processing of acknowledgment information from a mobile station that has notified the presence of communication using PDSCH in subframe #i.

On the other hand, in FIG. 1B, control information and transmission / reception of PDSCH in the #i subframe are the same as in FIG. 1A, but the mobile station 100 _n transmits the delivery confirmation information based on the CRC check result to the subframe. Transmission is performed using the uplink control channels # i + 3 and # i + 4 (S103 and S105). This figure also shows an example in which uplink shared channels are not transmitted in subframes # i + 3 and # i + 4. In subframes # i + 3 and # i + 4, base station apparatus 200 performs reception processing of acknowledgment information from a mobile station that has notified the presence of communication using PDSCH in subframe #i.

  By the way, when the acknowledgment information for the downlink shared channel is transmitted using the physical uplink control channel PUCCH located at both ends of the system band, the uplink radio resource has downlink scheduling information as shown in FIG. It is proposed that the resource number and the resource number of the downlink shared channel are specified in a one-to-one correspondence (see, for example, Non-Patent Document 5). In this document, the radio resource to which the acknowledgment information (UL ACK) is mapped is associated with the virtual resource block number of the downlink shared channel on a one-to-one basis.

The PUCCH radio resource is a frequency resource or code resource, that is, a PUCCH resource block number, or a code number when a plurality of acknowledgment information and other control information are code-multiplexed in the resource block. That is.
3GPP TR 25.814 (V7.0.0), "Physical Layer Aspects for Evolved UTRA," June 2006 R1-070103, Downlink L1 / L2 Control Signaling Channel Structure: Coding R1-070100, CDMA-Based Multiplexing Method for Multiple ACK / NACK and CQI in E-UTRA Uplink, January 2007 R1-070101, Repetition of ACK / NACK in E-UTRA Uplink, January 2007 R1-070437, Proposed Structure for UL ACK and CQI, January 2007

  However, these background techniques have the following problems.

  As described above, the uplink radio resource allocated to the acknowledgment information for the downlink shared channel is specified by having a one-to-one correspondence with the resource number of the downlink scheduling information or the resource number of the downlink shared channel.

  However, when the acknowledgment information is repeatedly transmitted over a plurality of subframes, if such a one-to-one designation method is applied as it is, uplink acknowledgment is performed for confirmation of the subsequent downlink shared channel. There arises a problem that link radio resources cannot be efficiently allocated. In other words, since the downlink scheduling information or the acknowledgment information for the downlink shared channel transmitted in a certain subframe is transmitted twice or more using a plurality of sub-frames, the downlink scheduling information and the downlink shared channel are followed. There is a high possibility of conflict with the notification of the downlink scheduling information and the delivery confirmation information for the downlink shared channel. For example, in the case of FIG. 1B, the downlink scheduling information received in subframe #i and the second and subsequent delivery confirmation information for the downlink shared channel are performed in PUCCH after subframe # i + 4, so subframe # i + 1 This resource number cannot be used for the downlink scheduling information received in step 1 and the delivery confirmation of the downlink shared channel. This is a problem in terms of effective use of resources and communication efficiency.

  Therefore, the present invention provides a delivery confirmation information transmission method capable of appropriately allocating radio resources even when delivery confirmation information for a downlink shared channel is repeatedly transmitted over a plurality of subframes. It is an object of the present invention to provide a mobile station (user apparatus) and a base station apparatus that execute various methods.

In a first aspect, a delivery confirmation information transmission method that realizes the above-described problem is provided. This method is a delivery confirmation information transmission method used in a mobile communication system including a user apparatus and a base station apparatus that communicates with the user apparatus,
Transmitting a shared channel from the base station apparatus to the user apparatus;
Preliminarily uniquely associating transmission-related information of the shared channel with two or more radio resources for transmitting acknowledgment information of the shared channel over two or more time frames;
Transmitting the acknowledgment information from the mobile station to the base station apparatus over two or more time frames using two or more radio resources specified by the correspondence relationship.

In a 2nd side, the user apparatus which carries out radio | wireless communication with a base station apparatus within such a mobile communication system is provided. User equipment
A receiving means for receiving a shared channel in the downlink;
A correspondence table that uniquely associates the transmission-related information of the shared channel with two or more radio resources for sending the acknowledgment information of the shared channel to the base station apparatus over two or more time frames;
In the uplink, using the radio resource specified in the correspondence table, transmission means for transmitting acknowledgment information of the shared channel in the two or more time frames is provided.

In a third aspect, a base station apparatus that performs radio communication with a mobile station in the mobile communication system is provided. Base station equipment
A transmission means for transmitting a shared channel in the downlink;
A correspondence table that uniquely associates transmission-related information of the shared channel with radio resources that should receive acknowledgment information for the shared channel over two or more time frames;
In uplink, receiving means for receiving acknowledgment information of the shared channel over the two or more time frames with radio resources specified in the correspondence table;
It comprises.

  In any aspect, as a good example of the above correspondence relationship, the radio resource number of the control channel transmitted from the base station apparatus accompanying the shared channel and the resource number of the two or more radio resources are uniquely set. The correspondence is mentioned.

  Alternatively, the correspondence relationship may be obtained by associating the radio resource number of the shared channel specified by the control channel with the resource numbers of the two or more radio resources.

  Preferably, the number of radio resources used for transmission of acknowledgment information may be determined in advance based on the number of mobile stations multiplexed within a certain time frame and the number of repetitions of repeatedly transmitting acknowledgment information.

  ADVANTAGE OF THE INVENTION According to this invention, even when the delivery confirmation information with respect to a downlink shared channel is repeatedly transmitted (repetition) over several time frames, a radio | wireless resource can be allocated appropriately.

It is explanatory drawing which shows the time relationship of the process of a mobile station and a base station apparatus, and is a figure which shows the case where the repetition factor (repetition factor) of transmission confirmation information transmission is 1. FIG. It is explanatory drawing which shows the time relationship of the process of a mobile station and a base station apparatus, and is a figure which shows the case where a repetition factor is 2. It is a figure which shows the example of mapping of the radio | wireless resource for transmission confirmation information transmission when a repetition coefficient is 1. FIG. It is the schematic which shows the radio | wireless communications system structure of one Embodiment of this invention. It is a figure which shows the example of mapping of an uplink control channel. The figure which shows the example of mapping (correspondence table) of the radio | wireless resource for transmission confirmation information transmission when a repetition factor is 2. It is a sequence diagram of operation | movement between the base station apparatus (eNB) and mobile station (or user apparatus UE) in one Embodiment of this invention. It is a block diagram which shows the structural example of the mobile station (UE) which concerns on one Embodiment of this invention. It is a structural example of the baseband signal processing part used with the mobile station of FIG. It is a block diagram which shows the structural example of the base station apparatus (eNB) which concerns on one Embodiment of this invention. 10 is a configuration example of a baseband signal processing unit used in the base station apparatus of FIG. 9.

Explanation of symbols

100 Mobile station (UE)
108 Baseband signal processor 1081 Layer 1 processor 1082 MAC processor 1083 Correspondence table (mobile station side)
1084 Delivery confirmation information generation unit 1085 User data processing unit 200 Base station apparatus (eNB)
208 Baseband signal processing unit 2081 Layer 1 processing unit 2082 MAC processing unit 2083 RLC processing unit 2086 Correspondence table (base station apparatus side)

  In the following, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Throughout the drawings, components having the same function are denoted by the same reference numerals, and repeated description is omitted.

FIG. 3 is a schematic diagram of a wireless communication system 1000 according to an embodiment of the present invention. The wireless communication system 1000 is a system to which, for example, Evolved UTRA and UTRAN (aka LTE or Super 3G) is applied. The radio communication system 100 includes a base station device (eNB) 200 and a plurality of mobile stations 100 _n (100 ₁ , 100 ₂ , 100 ₃ ,... 100 _n , n>n> 0 communicating with the base station device 200 Integer). Base station apparatus 200 is connected to an upper station, for example, access gateway apparatus 300, and access gateway apparatus 300 is connected to core network 400. The mobile station 100 _n communicates with the base station apparatus 200 in the cell 50 using Evolved UTRA and UTRAN.

Since each mobile station (100 ₁ , 100 ₂ , 100 ₃ ,... 100 _n ) has the same configuration, function, and state, the following description will be given as the mobile station 100 _n unless otherwise specified. For convenience of explanation, it is a mobile station that performs radio communication with the base station apparatus, but in reality, a user apparatus (UE) including both a mobile terminal and a fixed terminal communicates with the base station 200.

  In the radio communication system 1000, OFDM (Orthogonal Frequency Division Multiple Access) is applied for the downlink and SC-FDMA (Single Carrier Frequency Division Multiple Access) is applied for the uplink as the radio access scheme. As described above, OFDM is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single carrier transmission scheme that reduces interference between terminals by dividing a frequency band for each terminal and using a plurality of different frequency bands by a plurality of terminals.

  Here, communication channels in Evolved UTRA and UTRAN will be described.

For the downlink, a physical downlink shared channel (PDSCH) shared by each mobile station 100 _n and a physical downlink control channel (PDCCH: Physical Downlink Control Channel, which is a downlink L1 / L2 control channel) Also called). User data, that is, a normal data signal is transmitted through the physical downlink shared channel. Also, the physical downlink control channel allows the user ID to communicate using the physical downlink shared channel and the transport format information of the user data (that is, downlink scheduling information, Downlink Scheduling Information), and physical uplink sharing. An ID of a user who performs communication using a channel, information on the transport format of the user data (UL Grant: Uplink Scheduling Grant), delivery confirmation information on a physical uplink shared channel, and the like are notified. The downlink scheduling information and UL Grant may be collectively referred to as Downlink Control Information (DCI). The delivery confirmation information of the physical uplink shared channel is also called a Physical HARQ Indicator Channel (PHICH).

For the uplink, a physical uplink shared channel (PUSCH) shared by each mobile station 100 _n and an uplink control channel are used. User data, that is, a normal data signal is transmitted through the physical uplink shared channel.

  Also, downlink quality information (CQI: Channel Quality Indicator) to be used for scheduling processing and adaptive modulation and coding and coding processing (AMCS: Adaptive Modulation and Coding Scheme) in the downlink physical channel by the uplink control channel, And the acknowledgment information (Acknowledgement Information) of a physical downlink shared channel is transmitted. The contents of the delivery confirmation information are expressed by either an acknowledgment (ACK) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK) indicating that it has not been properly received.

  In the uplink control channel, in addition to CQI and delivery confirmation information, a scheduling request (Scheduling Request) for requesting resource allocation of an uplink shared channel, a release request (Release Request) in persistent scheduling (Persistent Scheduling), and the like. May be sent. Here, uplink shared channel resource allocation means that communication using an uplink shared channel is permitted in subsequent subframes using UL Grant in a physical downlink control channel of a certain subframe. This means that the base station apparatus notifies the mobile station.

  FIG. 4 shows an example of uplink channel mapping in LTE. In LTE, resource allocation is managed for each subframe, and bands to which CQI, delivery confirmation information, and the like are mapped differ depending on whether user data is transmitted by PUSCH. That is, when user data is transmitted in the subframe, CQI, delivery confirmation information, and the like are time-multiplexed and transmitted in the same band as the user data (reference numeral 520 in FIG. 4). In FIG. 4, reference numeral 500 indicates an area in which user data is transmitted. When user data is not transmitted in the subframe, as indicated by reference numeral 510, CQI, acknowledgment information, and the like are transmitted using physical uplink control channels located at both ends of the system band. Is done. A part of the system band is dedicated for the control channel of the mobile station that does not transmit user data. Each of the blocks # 0, # 1, # 2, and # 3 represents a control channel including delivery confirmation information of a certain mobile station. Since these control channels are transmitted using different frequencies in time (with frequency hopping) in the same subframe, it can be expected that the diversity effect is enhanced.

  The present embodiment provides a method for assigning radio resources for delivery confirmation information or a method for mapping radio resources when user data is not transmitted in an arbitrary subframe. This will be described in detail below.

  The technique used in the embodiment of the present invention is independent of the multiplexing method of the transmission channel, that is, when transmitting downlink scheduling information or the downlink shared channel, or when transmitting acknowledgment information for the downlink shared channel. The radio resources to be allocated are expressed as numbers. When the multiplexing method is CDMA, the assigned radio resource number corresponds to a code number. When the multiplexing method is FDMA, the assigned radio resource number corresponds to a frequency number, a subcarrier number, and a resource block number. . When the multiplexing method is a hybrid of CDMA and FDMA, for example, the radio resource number is a radio resource number defined by a code number and a frequency number. Further, when performing CDMA, for example, orthogonal CDMA using different cyclic shifts of CAZAC sequences or orthogonal CDMA using block spreading may be applied.

  First, the downlink scheduling information when the repetition factor is 1 and the radio resource allocation method of the acknowledgment information for the corresponding downlink shared channel have been described with reference to FIG. 1A and FIG. This is the same as the conventional method. That is, the radio resource of the downlink scheduling information and the radio resource allocated to the acknowledgment information for the corresponding downlink shared channel are defined in advance in a one-to-one correspondence with each resource number. For example, assuming that the number of mobile stations to which the downlink shared channel is transmitted in one subframe is 4, the number of multiplexed mobile stations in one subframe is 4. Therefore, the number of radio resources in the downlink scheduling information is 4, which are defined as # A1, # A2, # A3, and # A4, respectively. Similarly, the number of radio resources in the acknowledgment information for the corresponding downlink shared channel is 4, which are defined as # B1, # B2, # B3, and # B4, respectively. At this time, as shown in FIG. 2, by using a one-to-one correspondence with # A1- # B1, # A2- # B2, # A3- # B3, # A4- # B4, the radio used for the delivery confirmation information Resources are uniquely determined.

In the subframe #i of FIG. 1A, the mobile station 100 _{n that} has received the downlink scheduling information with the radio resource number # A2 of the physical downlink control channel transmits the uplink radio resource with the radio resource number # B2 in the subframe # i + 3. Used to transmit delivery confirmation information. That is, the mobile station 100 _n receives the corresponding PDSCH according to the downlink scheduling information whose radio resource number is # A2 (S101), receives the delivery confirmation information based on the CRC check result of the PDSCH, and the PUCCH whose radio resource number is # B2. (S103).

On the other hand, the base station apparatus 200, at S101, when the radio resource number is transmitted the downlink scheduling information # A2 to the mobile station 100 _n, in timing of subframe # i + 3, the uplink radio radio resource number # B2 The delivery confirmation information transmitted from the mobile station 100 _n is received by the resource. That is, the base station apparatus 200 receives the PDSCH delivery confirmation information specified by the downlink scheduling information with the radio resource number # A2 on the PUCCH with the radio resource number # B2 (S103).

  Next, radio resource allocation when the repetition factor (repetition factor) is 2 or more, which is a feature of the present embodiment, will be described. FIG. 5 is an example of a correspondence table that defines a correspondence relationship of radio resources for transmission of acknowledgment information used in the embodiment. In this example, the radio resource number of the downlink scheduling information is associated with the radio resource allocated to the transmission confirmation information for the corresponding downlink shared channel for each transmission repetition in a one-to-one correspondence.

  Also in this example, it is assumed that the number of mobile stations to which the downlink shared channel is transmitted in one subframe is 4. In this case, since the number of multiplexed mobile stations in one subframe is 4, the number of downlink scheduling information radio resources is 4, which are defined by # A1, # A2, # A3, # A4 and resource number, respectively. Is done. On the other hand, the number of radio resources reserved for acknowledgment information for the corresponding downlink shared channel is 8, and # B1, # B2, # B3, # B4, # B5, # B6, # B7, # It is defined by B8 and resource number.

  That is, the number Nr of radio resources reserved for delivery confirmation information for the downlink shared channel is defined as follows.

Nr = (the number of multiplexed mobile stations in one subframe) × (repetition coefficient)
Then, as shown in FIG. 5, the resource number of the downlink scheduling information (Downlink Scheduling Information) for each mobile station transmitted through the physical downlink control channel and the first transmission of the delivery confirmation information regarding the corresponding downlink shared channel are given. The radio resource number and the radio resource number given for the second transmission are associated in advance in a one-to-one correspondence. Such a correspondence is known in advance on both the base station side and the mobile station side. Thereby, the radio resource used for the delivery confirmation information is uniquely determined.

For example, in the subframe #i of FIG. 1B, the mobile station 100 _{n that} has received the downlink scheduling information whose radio resource number (multiplex position) is # A2 receives the PDSCH specified by this downlink scheduling information (S101). The delivery confirmation information based on the PDSCH CRC check result is transmitted for the first time in subframe # i + 3 using the PUCCH of radio resource number # B2 (S103). Further, in the subframe # i + 4, the second delivery confirmation information is transmitted using the PUCCH of the radio resource number # B6 (S105).

  What is different from the prior art is that the first transmission of the delivery confirmation information for the PDSCH received in the next subframe # i + 1 is performed in the subframe # i + 4 even if such transmission confirmation information is repeatedly transmitted (repetition). However, since different radio resources are allocated, there is no need to conflict with the second transmission corresponding to the previous subframe #i.

On the other hand, the base station apparatus 200, the case of transmitting downlink scheduling information of the radio resource number # A2 to the mobile station 100 _n in S101, 1 time acknowledgment that the mobile station 100 _n was used PUCCH radio resource number # B2 Since it is known in advance that the transmission of information and the transmission of the second delivery confirmation information using the PUCCH of the radio resource number # B6 are performed in subframes # i + 3 and # i + 4, the information is received at this reception timing (S103). , S105).

  That is, the base station device has a one-to-one correspondence with the radio resource of the downlink scheduling information at each predetermined repetition timing under the setting in which the acknowledgment information for the downlink shared channel is repeatedly transmitted from the mobile station. The delivery confirmation information is received using the uplink radio resource determined by.

  In the correspondence relationship of FIG. 5, instead of the radio resource number (multiplex position) of the downlink scheduling information in the left column, the resource number of the downlink shared channel specified by this downlink scheduling information is associated with one to one. Thus, the same effect can be obtained even when the radio resource number for the first transmission of the delivery confirmation information and the radio resource number for the second transmission are allocated.

  Further, when the wireless environment is not so good and the repetition factor is set to 3, the same configuration can be adopted. In this case, the number of radio resources to be secured is determined by multiplying the number of mobile stations to be multiplexed in the subframe by a repetition factor (in this case, 3), and is transmitted for the second time in FIG. The radio resource number column used in the third transmission may be provided in the column next to the radio resource number column to which the delivery confirmation information is mapped. The same applies when the repetition factor is 4 or more.

  The base station apparatus 200 may be configured to update the correspondence table as appropriate according to the radio propagation environment and the number of mobile stations in the subframe, and notify the mobile station of the update result.

  FIG. 6 is a sequence diagram showing operations of such a radio base station apparatus (eNB) and a mobile station (UE). In S11 and S12, the eNB transmits the physical downlink control channel PDCCH including the downlink scheduling information of the radio resource number # A1 and the corresponding physical downlink shared channel (PDSCH) to the UE. The UE detects downlink scheduling information addressed to the own station included in the physical downlink control channel, performs demodulation and decoding, and transports the corresponding physical downlink shared channel (PDSCH, DL-SCH as a transport channel) The format information is extracted (S13). According to the extracted transport format information of the downlink shared channel, the downlink shared channel addressed to the own station is received and decoded (S14), and an error determination such as CRC is performed on the decoded result (S15). In order to transmit the error determination result to the eNB as delivery confirmation information, the correspondence table in FIG. 5 is referred to, and two or more radio resource numbers assigned for repeated delivery confirmation (repetition) are specified ( S16). At this time, based on the # A1 of the radio resource number (position) of the downlink scheduling information multiplexed on the physical downlink control channel, the correspondence relationship of the uplink radio resource for acknowledgment information may be specified, or the downlink The correspondence relationship may be specified based on the radio resource number of the PDSCH specified by the scheduling information. The PDSCH radio resource number may be, for example, a resource block number or a resource block group number. A resource block group is a set of resource blocks composed of one or more resource blocks. At the delivery confirmation information transmission timing (YES in S17), the first delivery confirmation information is transmitted using the specified uplink resource number (eg, # B1) in a predetermined subframe (S18), and the subsequent sub Using the specified uplink resource number (for example, # B5) in the frame, the second delivery confirmation information is transmitted (S19).

FIG. 7 is a schematic block diagram of a mobile station 100 _{n according} to an embodiment of the present invention. The mobile station 100 _n includes a transmission / reception antenna 102, an amplifier unit 104, a transmission / reception unit 106, a baseband signal processing unit 108, and an application unit 110.

  As for downlink data, a radio frequency signal received by the transmission / reception antenna 102 is amplified by the amplifier unit 104, frequency-converted by the transmission / reception unit 106 and converted into a baseband signal. The baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 108. Among the downlink data, downlink user data is transferred to the application unit 110. The application unit 110 performs processing related to layers higher than the physical layer and the MAC layer.

  On the other hand, uplink user data is input from the application unit 110 to the baseband signal processing unit 108. The baseband signal processing unit 108 performs retransmission control (Hybrid ARQ) transmission processing, channel coding, IDFT processing, IFFT processing, and the like, and transfers them to the transmission / reception unit 106. The transmission / reception unit 106 performs frequency conversion processing for converting the baseband signal output from the baseband signal processing unit 108 into a radio frequency band, and then is amplified by the amplifier unit 104 and transmitted from the transmission / reception antenna 102.

  FIG. 8 is a schematic diagram illustrating a configuration example of the baseband signal processing unit 108 of FIG. The baseband signal processing unit 108 includes a layer 1 processing unit 1081 and a MAC (Medium Access Control) processing unit 1082. The layer 1 processing unit 1081 has a radio resource correspondence table 1083 as shown in FIG. The correspondence table 1083 may include the one-to-one correspondence table shown in FIG. 2 when the repetition coefficient is 1. The MAC processing unit 1082 includes a delivery confirmation information generation unit 1084 and a user data processing unit 1085.

  The layer 1 processing unit 1081 performs channel decoding, FFT processing, and the like of a signal received on the downlink. Also, demodulation and decoding of the physical downlink control channel included in the downlink reception signal is performed, and the decoding result is transmitted to the MAC processing unit 1082.

  Also, the layer 1 processing unit 1081 measures the received signal quality of a downlink reference signal (DL-RS). The received signal quality may be expressed, for example, as a ratio of desired signal power to undesired signal power, for example, SIR (Signal-to-Interference Ratio). For example, the numerical value range expressing the SIR may be divided into a predetermined number, and the CQI may be derived depending on which area the SIR measurement value belongs to. The CQI is prepared according to a predetermined reporting period, and the CQI is transmitted in a subframe corresponding to the period.

  The layer 1 processing unit 1081 receives the delivery confirmation information from the delivery confirmation information generation unit 1084 when transmitting the delivery confirmation information in the current subframe, and transmits the user data in the current subframe. User data is received from the data processing unit 1085. Then, CQI, delivery confirmation information, and user data are subjected to processing such as encoding, data modulation, and bit mapping, DFT processing, subcarrier mapping processing, IFFT processing, and the like, and these are used as a baseband signal for transmitting / receiving section 106 To FIG. 7).

When the user data is not transmitted and when the transmission confirmation information or CQI is transmitted, the layer 1 processing unit 1081 transmits the transmission confirmation information or CQI to a channel (PUCCH: Physical) prepared exclusively for both ends of the system band. Map to Uplink Control Channel). At this time, as a feature of the present embodiment, the layer 1 processing unit 1081 refers to the correspondence table 1083, the table shown in FIG. 2 and FIG. 5, that is, the resource number of the downlink scheduling information for the mobile station 100 _n ( Alternatively, the acknowledgment information is transmitted using the uplink radio resource set in a one-to-one correspondence with the resource number of the physical downlink shared channel specified by the downlink scheduling information.

  In the MAC processing unit 1082, the user data processing unit 1085 determines the transmission format of uplink user data based on the decoding result of the physical downlink control channel received from the layer 1 processing unit 1081, and performs retransmission control in the MAC layer. Perform transmission processing. That is, in the physical downlink control channel received from the layer 1 processing unit 1081, when communication using a shared channel in the uplink is permitted, transmission format determination and retransmission control are performed for user data to be transmitted. The user data is given to the layer 1 processing unit 1081. If the physical downlink control channel received from the layer 1 processing unit 1081 is not permitted to perform communication using the shared channel in the uplink, processing for not transmitting user data is performed.

  Further, the MAC processing unit 1082 performs reception processing of MAC retransmission control of downlink user data based on the decoding result of the physical downlink control channel received from the layer 1 processing unit 1081. That is, when it is notified that communication using a shared channel is performed in the downlink, the received user data is decoded, and a CRC check is performed to determine whether the user data signal is incorrect. Then, the delivery confirmation information generation unit 1084 generates delivery confirmation information based on the CRC check result, and notifies the layer 1 processing unit 1081 of it. When the CRC check result is OK, an acknowledgment signal ACK is generated as delivery confirmation information, and when the CRC check result is NG, a negative response signal NACK is generated as delivery confirmation information.

  FIG. 9 is a schematic block diagram of the base station apparatus 200 according to the embodiment of the present invention. The base station apparatus 200 includes a transmission / reception antenna 202, an amplifier unit 204, a transmission / reception unit 206, a baseband signal processing unit 208, a call processing unit 210, and a transmission path interface 212.

User data transmitted from the base station apparatus 200 to the mobile station 100 _n via the downlink is transmitted from the upper station located above the base station apparatus 200, for example, the access gateway apparatus 300 via the transmission path interface 212. 208 is input.

  The baseband signal processing unit 208 performs RLC layer transmission processing such as user data division / combination, RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ (Hybrid Automatic Repeat). reQust) transmission processing, scheduling, transmission format selection, channel coding, and inverse fast Fourier transform (IFFT) processing are performed, and the result is transferred to the transmission / reception unit 206. Also, transmission processing such as channel coding and inverse fast Fourier change is performed on the signal of the physical downlink control channel, which is the downlink control channel, and is transferred to the transmission / reception unit 206.

  The transmission / reception unit 206 performs frequency conversion processing for converting the baseband signal output from the baseband signal processing unit 208 into a radio frequency band, and then is amplified by the amplifier unit 204 and transmitted from the transmission / reception antenna 202.

On the other hand, for data transmitted from the mobile station 100 _n to the base station apparatus 200 via the uplink, a radio frequency signal received by the transmission / reception antenna 202 is amplified by the amplifier unit 204, and frequency-converted by the transmission / reception unit 206. The signal is converted into a signal and input to the baseband signal processing unit 208.

  The baseband signal processing unit 208 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer reception processing on user data included in the input baseband signal, and transmission path The data is transferred to the access gateway apparatus 300 via the interface 212.

  The call processing unit 210 performs call processing such as communication channel setting and release, state management of the radio base station 200, and radio resource management.

  FIG. 10 is a schematic diagram illustrating a configuration example of the baseband signal processing unit 208 of FIG. The baseband signal processing unit 208 includes a layer 1 processing unit 2081, a MAC processing unit 2082, and an RLC processing unit 2083. The layer 1 processing unit 2081 has a correspondence table 2086 as shown in FIG. This table may also include a table when the repetition factor is 1 as shown in FIG.

  The layer 1 processing unit 2081, the MAC processing unit 2082, and the call processing unit 210 in the baseband signal processing unit 208 are connected to each other.

  The layer 1 processing unit 2081 performs channel coding and IFFT processing of data transmitted in the downlink, channel decoding, IDFT processing, FFT processing, and the like of data transmitted in the uplink. The layer processing unit 2081 performs communication using the ID of a user who performs communication using the physical downlink shared channel and information on the transport format of the user data (that is, downlink scheduling information) and the physical uplink shared channel. The user ID and the transport format information (UL Grant) of the user data are received from the MAC processing unit 2082. Then, transmission processing such as channel coding and IFFT processing is performed on the downlink scheduling information and UL Grant. The ID of the user who communicates using the physical downlink shared channel, the transport format information of the user data, the ID of the user who communicates using the physical uplink shared channel, and the user data The port format information is mapped to a physical downlink control channel that is a downlink control channel.

  The layer 1 processing unit 2081 also performs demodulation and decoding of CQI mapped to the uplink control channel transmitted on the uplink and acknowledgment information. The layer 1 processing unit 2081 is mapped to physical uplink control channels (PUCCH) located at both ends of the system band when user data is not received in the uplink and when acknowledgment information or CQI is received. Delivery receipt information or CQI reception processing is performed.

  At this time, when receiving the acknowledgment information mapped to the PUCCH, with reference to the correspondence table 2086 shown in FIG. 2 and FIG. The reception confirmation information from the mobile station to be received is received.

  The MAC processing unit 2082 performs MAC retransmission control of downlink user data, for example, HARQ transmission processing, scheduling processing, transmission format selection processing, frequency resource allocation processing, and the like. Here, the scheduling process refers to a process of selecting a mobile station that receives user data using a shared channel in the downlink of the subframe. The transmission format selection processing refers to processing for determining a modulation scheme, coding rate, and data size related to user data received by a mobile station selected in scheduling. The modulation scheme, coding rate, and data size are determined based on, for example, the quality of CQI reported from the mobile station in the uplink. Further, the frequency resource allocation process refers to a process of determining a resource block used for user data received by a mobile station selected in scheduling. The resource block is determined based on, for example, CQI reported from the mobile station in the uplink. Then, the MAC processing unit 2082 determines the ID of the user who performs communication using the physical downlink shared channel and the transcoding of the user data determined by the above-described scheduling process, transmission format selection process, and frequency resource allocation process. The port format information is notified to the layer 1 processing unit 2081.

  In addition, the MAC processing unit 2082 performs reception processing for MAC retransmission control of uplink user data, scheduling processing, transmission format selection processing, frequency resource allocation processing, and the like. Here, the scheduling process refers to a process of selecting a mobile station that transmits user data using a shared channel in the subframe. The transmission format selection process refers to a process of determining a modulation scheme, a coding rate, and a data size related to user data transmitted by a mobile station selected in scheduling. The modulation scheme, coding rate, and data size are determined based on, for example, the SIR of the sounding reference signal transmitted from the mobile station in the uplink. Furthermore, the frequency resource allocation process refers to a process of determining a resource block used for transmitting user data transmitted by a mobile station selected in scheduling. The determination of the resource block is performed based on, for example, the SIR of the sounding reference signal transmitted from the mobile station in the uplink. Then, the MAC processing unit 2082 determines the ID of the user who performs communication using the physical uplink shared channel and the transcoding of the user data determined by the above-described scheduling process, transmission format selection process, and frequency resource allocation process. The port format information is notified to the layer 1 processing unit 2081.

  The RLC processing unit 2083 performs RLC layer transmission processing such as division / combination for downlink packet data and transmission processing for RLC retransmission control, and RLC for division / combination and reception processing for RLC retransmission control for uplink data. Performs layer reception processing. The RLC processing unit may further perform PDCP layer processing.

  In the above-described example, the HARQ control of the downlink shared channel has been described assuming that the HARQ Round Trip Time is 6 ms. However, the mobile station, the base station apparatus, the mobile communication system, and the communication control according to the present invention have been described. The method can also be applied when the HARQ Round Trip Time is other than 6 ms. That is, the mobile station, the base station apparatus, the mobile communication system, and the communication control method according to the present invention can also be applied when the round trip time of HARQ is 8 ms, 10 ms, or other cases.

  In the embodiment described above, an example in a system to which Evolved UTRA and UTRAN (also known as LTE or Super 3G) is applied has been described. However, the mobile station, base station apparatus, mobile communication system, and communication control method according to the present invention are described. Is applicable to any other system that performs communication using a shared channel.

  This international application claims priority based on Japanese Patent Application No. 2007-071593 filed on Mar. 19, 2007, the entire contents of which are incorporated herein by reference.

Claims (12)

A user apparatus that wirelessly communicates with a base station apparatus in a mobile communication system:
A receiving means for receiving a shared channel in the downlink;
A correspondence table that uniquely associates the transmission-related information of the shared channel with two or more radio resources for sending the acknowledgment information of the shared channel to the base station apparatus over two or more time frames;
In uplink, using the radio resource specified in the correspondence table, transmission means for transmitting acknowledgment information of the shared channel in the two or more time frames;
Equipped with,
The correspondence table describes a radio resource number of a control channel transmitted from the base station apparatus in association with the shared channel and a resource number of the two or more radio resources in association with each other. User equipment to do. A user apparatus that wirelessly communicates with a base station apparatus in a mobile communication system:
A receiving means for receiving a shared channel in the downlink;
A correspondence table that uniquely associates the transmission-related information of the shared channel with two or more radio resources for sending the acknowledgment information of the shared channel to the base station apparatus over two or more time frames;
In uplink, using the radio resource specified in the correspondence table, transmission means for transmitting acknowledgment information of the shared channel in the two or more time frames;
Comprising
The correspondence table, the wireless resource numbers of the shared channel, the two or more radio resources of the resource numbers and features and to Ruyu over laser device to describe in association with. The user according to claim 1 , wherein the correspondence table describes a radio resource number of the shared channel specified by the control channel and a resource number of the two or more radio resources in association with each other. apparatus. The transmission means transmits the acknowledgment information of the shared channel at a first timing using the first radio resource determined in the correspondence table, and transmits the second radio resource determined in the correspondence table. repeatedly transmitted at the second timing with, the user device according to claim 1 or 2, characterized in that. A base station device that communicates wirelessly with a mobile station within a mobile communication system:
A transmission means for transmitting a shared channel in the downlink;
A correspondence table that uniquely associates transmission-related information of the shared channel with radio resources that should receive acknowledgment information for the shared channel over two or more time frames;
In uplink, receiving means for receiving acknowledgment information of the shared channel over the two or more time frames with radio resources specified in the correspondence table;
Equipped with,
The base station apparatus characterized in that the correspondence table describes a radio resource number of a control channel transmitted along with the shared channel and a resource number of the two or more radio resources in association with each other . A base station device that communicates wirelessly with a mobile station within a mobile communication system:
A transmission means for transmitting a shared channel in the downlink;
A correspondence table that uniquely associates transmission-related information of the shared channel with radio resources that should receive acknowledgment information for the shared channel over two or more time frames;
In uplink, receiving means for receiving acknowledgment information of the shared channel over the two or more time frames with radio resources specified in the correspondence table;
Comprising
The correspondence table, the wireless resource numbers of the shared channel, the two or more radio resources of the resource numbers and group Chikyoku device characterized in that described in association with. 6. The base according to claim 5 , wherein the correspondence table describes a radio resource number of the shared channel specified by the control channel and a resource number of the two or more radio resources in association with each other. Station equipment. The reception means receives the acknowledgment information of the shared channel at a first timing with a first radio resource determined by the correspondence table, and receives a second with a second radio resource determined by the correspondence table. The base station apparatus according to claim 5 or 6, wherein the base station apparatus repeatedly receives at the timing of. A delivery confirmation information transmission method used in a mobile communication system including a user apparatus and a base station apparatus that communicates with the user apparatus,
Transmitting a shared channel from the base station apparatus to the user apparatus;
Preliminarily associating the transmission-related information of the shared channel with two or more radio resources for transmitting the acknowledgment information of the shared channel over two or more time frames;
Transmitting the delivery confirmation information from the mobile station to the base station apparatus over two or more time frames using two or more radio resources specified by the correspondence relationship;
Only including,
The correspondence relationship associates a radio resource number of a control channel transmitted from the base station apparatus in association with the shared channel and a resource number of the two or more radio resources, and transmission of acknowledgment information Method. A delivery confirmation information transmission method used in a mobile communication system including a user apparatus and a base station apparatus that communicates with the user apparatus,
Transmitting a shared channel from the base station apparatus to the user apparatus;
Preliminarily associating the transmission-related information of the shared channel with two or more radio resources for transmitting the acknowledgment information of the shared channel over two or more time frames;
Transmitting the delivery confirmation information from the mobile station to the base station apparatus over two or more time frames using two or more radio resources specified by the correspondence relationship;
Including
The correspondence relationship is a radio resource number of the shared channel, the two or more features and to that feed delivery receipt information transmission method that associates the resource number of the radio resources. 10. The transmission confirmation information transmission according to claim 9 , wherein the correspondence relationship associates a radio resource number of the shared channel specified by the control channel with resource numbers of the two or more radio resources. Method. Obtaining the number of radio resources to be used for transmitting the acknowledgment information in advance based on the number of mobile stations multiplexed in the time frame and the repetition number of repeatedly transmitting the acknowledgment information;
The delivery confirmation information transmitting method according to claim 9 or 10 , further comprising:

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