JP2008289114A - Mobile communication system, base station apparatus, user apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately receive an upstream signal by a base station apparatus irrespectively of the status of reception of downstream scheduling information, if upstream scheduling information has been appropriately received by a user apparatus. <P>SOLUTION: A bit range of arrival acknowledging information, which is time multiplexed with an ordinary data signal, is always reserved in the upstream signal, independently of whether the arrival acknowledging information is transmitted. Even if a downstream L1/L2 control channel, which is to be used for notifying the information as to which mobile station uses a shared channel to perform communication, is erroneous, then the base station apparatus can appropriately receive the normal data signal through the uplink. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

Successor to the wideband code division multiple access (W-CDMA) system, high-speed downlink packet access (HSDPA) system, high-speed uplink packet access (HSUPA) system, etc., that is, long term evolution (LTE)
Evolution) is being considered by the W-CDMA standardization body 3GPP. As a radio access method in LTE, as for downlink, orthogonal frequency division multiple access (OFDM
: Orthogonal Frequency Division Multiplexing (Single Frequency Division Multiplexing) (SC-F)
The DMA (Single-Carrier Frequency Division Multiple Access) method is considered promising (for example, see Non-Patent Document 1).

  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) (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). Further, 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 downlink L1 / L2 control channel, a downlink low layer control channel (DL L1 / L2 control channel), or a physical downlink control channel Physical Downlink Control Channel. The notification of information regarding which mobile station performs communication using the shared channel is performed using the downlink low layer control channel for each of the downlink and the uplink. (Non-Patent Document 2)
In the LTE MAC layer, hybrid automatic repeat control (HARQ: Hybrid Automatic Repeat reQu) is performed in both downlink and uplink.
est) applies. For example, in the downlink, the mobile station transmits Acknowledgment Information, which is the delivery confirmation information, based on the DL-SCH CRC check result in the uplink. 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 response (NACK) indicating that it has not been properly received.

As an example, in the HSDPA system, the delivery confirmation information is transmitted using a high-speed dedicated physical control channel (HS-DPCCH) that is a dedicated physical control channel for uplink HSDPA. The HS-DPCCH is code-multiplexed with a channel to which a normal data signal is mapped and transmitted. That is, the delivery confirmation information and the normal data signal are transmitted through different channels (for example, Non-Patent Document 3).
On the other hand, in the LTE system, when the mobile station transmits a normal data signal, the delivery confirmation information is time-multiplexed with the normal data signal and transmitted, and the mobile station does not transmit the normal data signal. Are being transmitted using uplink physical control channels located at both ends of the system band. (For example, Non-Patent Document 4)
Here, a normal data signal is a concept including user data such as packet data for data communication and voice packets (for example, VoIP packets), and is transmitted on a shared data channel (in the case of uplink, PUSCH). In the case of downlink, it is transmitted by PDSCH.) The transport channel corresponds to UL-SCH in the case of uplink and DL-SCH in the case of downlink.
3GPP TR 25.814 (V7.0.0), "Physical Layer Aspects for EvolvedUTRA," June 2006 R1-070103, Downlink L1 / L2 Control Signaling Channel Structure: Coding 25.211 V6.7.0 2005-12 R1-070100, CDMA-Based Multiplexing Method for Multiple ACK / NACK and CQI in E-UTRA Uplink, January 2007 R4-030928, Simulation conditions for HS-DPCCH (ACK / NACK) detection performance, November 2003

  However, the background art described above has the following problems.

  Consider a case where communication is performed using a shared channel and hybrid automatic retransmission control (HARQ) is used. If the downlink L1 / L2 control channel includes information on which mobile station performs communication using the shared channel and it is not properly received by the mobile station, the mobile station and the mobile station A state mismatch occurs between stations. For example, the base station apparatus uses a downlink L1 / L2 control channel for a certain mobile station, and together with control information (downlink scheduling information) indicating that the mobile station should receive a downlink shared channel with a certain resource Assume that a shared channel (shared data channel) is transmitted. It is assumed that this mobile station cannot correctly receive scheduling information included in the downlink L1 / L2 control channel. In this case, the mobile station not only cannot properly receive the shared channel, but also does not know that the shared channel has been transmitted to the mobile station. Therefore, acknowledgment information (ACK / NACK) indicating the reception result of the shared channel is not obtained. Also do not send. On the other hand, the base station apparatus does not know that the mobile station has not correctly received the scheduling information included in the downlink L1 / L2 control channel. Therefore, the base station apparatus expects delivery confirmation information for the shared channel to be transmitted from the mobile station at a predetermined timing after transmission of the shared channel.

  If the mobile communication system is HSDPA, this acknowledgment information and a normal data signal are transmitted on different channels. Therefore, the base station apparatus will be able to demodulate and decode the normal data signal from the mobile station regardless of whether the mobile station transmits acknowledgment information.

  However, in the case of LTE, as described above, the acknowledgment information and the normal data signal are transmitted in the same resource block, so that the mobile station delivers in order to properly demodulate and decode the normal data signal. It is necessary to know whether or not confirmation information has been transmitted. This is because the position where a normal data signal is mapped differs between when the mobile station transmits acknowledgment information and when the mobile station does not transmit acknowledgment information. Therefore, after the base station apparatus transmits the shared data channel, if the mobile station transmits without including the acknowledgment information in the uplink signal, the base station apparatus transmits the contents in the uplink signal (uplink shared data channel). ) Cannot be demodulated properly. In other words, when the downlink scheduling information is not correctly received in the mobile station, even if the mobile station appropriately receives the uplink scheduling information and transmits the uplink signal based thereon, the base station apparatus A normal data signal cannot be received correctly, which is not preferable from the viewpoint of system throughput and the like.

  An object of the present invention is to allow an uplink signal to be properly received at a base station if uplink scheduling information is properly received by a user apparatus, regardless of the reception state of downlink scheduling information.

  The mobile communication system used in the present invention includes a user apparatus and a base station apparatus that communicates with the user apparatus. The user apparatus includes receiving means for receiving the first shared channel in the downlink, and transmitting means for transmitting the first shared channel acknowledgment information and the second shared channel in the uplink. The transmission means prohibits the second shared channel from being mapped to the bit area for the acknowledgment information even in the uplink signal that does not require the acknowledgment information. The base station apparatus includes a transmission unit that transmits the first shared channel in the downlink, a reception unit that receives the delivery confirmation information of the first shared channel and the second shared channel in the uplink, and a delivery Means for extracting and decoding a second shared channel mapped outside the bit area for confirmation information.

  According to the present invention, an uplink signal can be appropriately received by a base station apparatus if the uplink scheduling information is appropriately received by the user apparatus regardless of the reception state of the downlink scheduling information.

Receiving means for receiving the first shared channel in the downlink;
A transmission means for transmitting the acknowledgment information of the first shared channel and the second shared channel in the uplink;
Even if the uplink signal does not require delivery confirmation information, it is prohibited to map the second shared channel in the bit area for the delivery confirmation information.

  In an uplink signal that does not require delivery confirmation information, it may be prohibited to allocate power indicating that some data exists in the bit area for the delivery confirmation information.

  It may be prohibited to map the downlink reception quality information in the bit area for the delivery confirmation information.

  The portion representing the second shared channel and the portion representing the acknowledgment information may be multiplexed by one or more of time division multiplexing, frequency division multiplexing, and code division multiplexing.

When a downlink control channel for the first shared channel is not transmitted,
Even in the uplink signal that does not require the delivery confirmation information, the second shared channel may be prohibited from being mapped to the bit area for the delivery confirmation information.

When persistent scheduling is applied to the second shared channel,
Even in the uplink signal that does not require the delivery confirmation information, the second shared channel may be prohibited from being mapped to the bit area for the delivery confirmation information.

When the second shared channel is retransmitted,
Even in the uplink signal that does not require the delivery confirmation information, the second shared channel may be prohibited from being mapped to the bit area for the delivery confirmation information.

According to one form of this invention, the base station apparatus which performs radio | wireless communication with a user apparatus within a mobile communication system is used. Base station equipment
A transmission means for transmitting the first shared channel in the downlink;
Receiving means for receiving the acknowledgment information of the first shared channel and the second shared channel in the uplink;
Means for extracting and decoding a second shared channel mapped outside the bit region for acknowledgment information;
It is characterized by having.

When the downlink control channel for the first shared channel does not transmit,
The second shared channel mapped outside the bit area for the delivery confirmation information may be extracted and decoded.

When persistent scheduling is applied to the second shared channel,
The second shared channel mapped outside the bit area for the delivery confirmation information may be extracted and decoded.

When the second shared channel is retransmitted,
The second shared channel mapped outside the bit area for the delivery confirmation information may be extracted and decoded.

  Downlink reception quality information mapped outside the bit area for delivery confirmation information may be extracted and decoded.

  The base station apparatus may include determination means for determining whether or not the acknowledgment information is included in the uplink signal received after the transmission of the first shared channel.

  If the determination means confirms that the delivery confirmation information is not included, the base station apparatus may include a retransmission means for retransmitting the first shared channel.

  The determination by the determination unit may be performed based on the received signal quality of a signal portion that may include acknowledgment information in the uplink signal.

According to one form of this invention, the mobile communication system which has a user apparatus and the base station apparatus which communicates with the said user apparatus is used. The user equipment is
Receiving means for receiving the first shared channel in the downlink;
Transmitting means for transmitting the acknowledgment information of the first shared channel and the second shared channel in uplink;
It is prohibited to map the second shared channel in the bit area for the delivery confirmation information even for an upstream signal that has the transmission confirmation information and does not require delivery confirmation information. The base station device
Transmitting means for transmitting the first shared channel in the downlink;
Receiving means for receiving the acknowledgment information of the first shared channel and the second shared channel on the uplink;
Means for extracting and decoding a second shared channel mapped outside the bit region for acknowledgment information;
It is characterized by having.

In one form of the present invention, a method used in a mobile communication system having a user apparatus and a base station apparatus that communicates with the user apparatus is used. This method
Transmitting a first shared channel from the base station apparatus to the user apparatus;
An uplink signal that may include delivery confirmation information of the first shared channel in addition to the second shared channel is transmitted from the user apparatus to the base station apparatus;
And the user apparatus is prohibited from mapping the second shared channel to the bit area for the delivery confirmation information even in the uplink signal that does not require the delivery confirmation information.
It is characterized by that.

  According to an aspect of the present invention, the uplink scheduling information is properly received by the user apparatus even if the downlink scheduling information is not properly received by the user apparatus by always ensuring the bit area of the delivery confirmation information. Then, the base station apparatus can correctly receive a normal data signal on the uplink.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

  A radio communication system having a mobile station and a base station apparatus according to an embodiment of the present invention will be described with reference to FIG.

The wireless communication system 1000 is a system to which, for example, Evolved UTRA and UTRAN (also known as Long Term Evolution, or Super 3G) is applied. The radio communication system 100 includes a base station apparatus (eNB: eNode B) 200 and a plurality of mobile stations 100 _n (100 ₁ , 100 ₂ , 100 ₃ ,... 100 _n , n that communicate with the base station apparatus 200. > An integer of> 0). 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 device 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, the mobile station communicates with the base station apparatus wirelessly, but more generally, a user apparatus (UE: User Equipment) including both a mobile terminal and a fixed terminal may be used.

  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.

Regarding the downlink, a physical downlink shared channel (PDSCH) shared by each mobile station 100 _n and a downlink control channel (PDCCH: Physical Downlink Control Channel, also called a downlink L1 / L2 control channel). And are used. User data, that is, a normal data signal is transmitted through the physical downlink shared channel. In addition, the ID of the user who communicates using the physical downlink shared channel by the downlink control channel, the information of the transport format of the user data, and the ID of the user who communicates using the physical uplink shared channel Also, information on the transport format of the user data, delivery confirmation information on the physical uplink shared channel, and the like are notified.

For 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.

  In addition, downlink quality information (CQI: Channel Quality Indicator) for use in scheduling processing, adaptive modulation and demodulation and coding processing (AMCS: Adaptive Modulation and Coding Scheme) of the downlink shared physical channel by the uplink control channel, And the acknowledgment information (Acknowledgment Information) of the physical downlink shared channel is transmitted. The content of the delivery confirmation information is expressed by either an acknowledgment (ACK: Acknowledgment) indicating that the transmission signal has been properly received or a negative acknowledgment (NACK: Negative Acknowledgment) indicating that the transmission signal has not been properly received. Is done.

  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 (Release Request), and the like. May be sent.

  Here, the resource allocation of the uplink shared channel means that the base station can perform communication using the uplink shared channel in the subsequent subframe using the downlink L1 / L2 control channel of a certain subframe. This means that the device notifies the mobile station.

  FIG. 2 shows an example of channel mapping in LTE. In LTE, resource allocation is managed for each subframe, and the band to which CQI, delivery confirmation information, and the like are mapped differs 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 (520 in FIG. 2). Reference numeral 500 in FIG. 2 denotes an area where user data is transmitted. When user data is not transmitted in the subframe, CQI, delivery confirmation information, and the like are transmitted using physical uplink control channels (Physical Uplink Control Channels) located at both ends of the system band (in FIG. 2). 510). A part of the system band is dedicated for a control channel of a user who does not transmit user data. In the figure, each of # 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 to enhance the diversity effect.

  In the above description, a control channel for transmitting CQI, delivery confirmation information, etc. is defined for CQI, delivery confirmation information, etc. when user data is transmitted, and the control channel and PUSCH are time-multiplexed. However, instead of the CQI and the delivery confirmation information when user data is transmitted, a time-multiplexed configuration may be used as part of the PUSCH that transmits the user data.

  FIG. 3 shows a configuration example of a subframe. In uplink transmission, two slots are included in one subframe, and the use of seven long blocks (LB) per slot is under study. That is, one subframe is composed of 14 long blocks. A data demodulation reference signal (Demodulation Reference Signal) is mapped to two of the 14 long blocks. The reference signal may be referred to as a pilot channel, a training sequence, or the like, and is a signal or channel that represents a known signal pattern before communication on the transmission side and the reception side. Although not shown in the figure, it is also considered to use a short block (SB) having a shorter duration than a long block as necessary. The data demodulation reference signal is a signal for performing channel compensation such as phase rotation of the received signal based on the reception state of the reference signal. The long block described above may be referred to as an SC-FDMA symbol.

  Also, in one of the 14 blocks other than the long block to which the above-described data demodulation reference signal is mapped, the transmission format of the physical uplink shared channel such as scheduling or uplink AMC or TPC is determined. In some cases, a sounding reference signal used for sounding is transmitted. In the long block to which the sounding reference signal is transmitted, sounding reference signals from a plurality of mobile stations are multiplexed by a code division multiplexing (CDM) method. For example, the data demodulation reference signal may be mapped to the fourth long block and the eleventh long block in one subframe. The sounding reference signal is mapped to the first long block in one subframe, for example. Then, user data, CQI, delivery confirmation information, and the like are mapped to a long block in which the data demodulation reference signal and the sounding reference signal are not mapped. The sounding reference signal is used for performing scheduling (allocation of resource blocks for uplink and downlink, adjustment of uplink transmission power, etc.) in the base station apparatus.

  The embodiment of the present invention relates to a method for mapping CQI or delivery confirmation information and user data when user data is transmitted in the subframe, and will be described in more detail below.

FIG. 4 shows transmission confirmation information, CQI and user data transmission patterns. Since the CQI is transmitted from the mobile station 100 _n to the base station apparatus 200 based on a predetermined reporting period, there are subframes in which CQI is transmitted and subframes in which CQI is not transmitted. Which subframe includes the CQI can be predicted by the base station apparatus because the reporting period is known. Since the delivery confirmation information is transmitted only when the downlink shared channel is received at a predetermined timing, there are subframes in which the delivery confirmation information is transmitted and subframes in which the delivery confirmation information is not transmitted. The time interval between the transmission timing from the base station device and the reception timing of the delivery confirmation information may be fixedly determined by the system, or the base station device may notify the mobile station each time. In any case, the base station apparatus knows in which subframe the CQI and delivery confirmation information should be included.

  In summary, when user data is transmitted in a certain subframe, four transmission patterns shown in FIG. 4 can be considered depending on the presence / absence of CQI and delivery confirmation information. That is, a transmission pattern (pattern 1) in which only user data is transmitted in the subframe, a transmission pattern (pattern 2) in which user data and delivery confirmation information are transmitted in the subframe, and user data in the subframe And CQI are transmitted (pattern 3), and user data, delivery confirmation information, and CQI are transmitted in the subframe (pattern 4).

  FIG. 5 shows an example of channel mapping in each transmission pattern. In other words, user data, delivery confirmation information, and CQI bit mapping examples are shown for each of the four transmission patterns. Here, FIG. 5 extracts only a long block to which user data, CQI, delivery confirmation information, etc. are mapped from the long block LB of the subframe shown in FIG. As shown. Based on the illustrated bit mapping, user data, delivery confirmation information, and CQI are transmitted from the mobile station to the base station apparatus.

  In pattern 1 shown in FIG. 5, only user data is transmitted in the subframe, and neither acknowledgment information nor CQI is transmitted. Nevertheless, in addition to a bit area to which user data is mapped, a bit area to which delivery confirmation information may be mapped is provided. Since there is no acknowledgment information to be transmitted, this bit area does not contain significant information, that is, no signal is mapped (corresponding to an intermittent period in intermittent transmission (DTX)). More generally, for this bit area, it is prohibited to allocate power indicating that some data exists.

  In pattern 2, user data and delivery confirmation information are transmitted in the subframe, but CQI is not transmitted. For this reason, a bit area where user data is mapped and a bit area where delivery confirmation information is mapped are provided. In this case, acknowledgment (ACK) and negative acknowledgment (NACK) exist as delivery confirmation information to be transmitted, and one of them is mapped based on the CRC check result of the corresponding downlink shared channel DL-SCH. The That is, when the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped, and the corresponding downlink shared channel DL-SCH cannot be correctly received. In this case (when the CRC check result is NG), NACK is mapped. For example, power corresponding to a signal component of “+1” is mapped to one of ACK and NACK, and power corresponding to a signal component of “−1” is mapped to the other. The power corresponding to “0” is mapped to the portion in the above DTX, which reflects that no data exists in the portion.

  In pattern 3, user data and CQI are transmitted in the subframe, but delivery confirmation information is not transmitted. Nevertheless, in addition to a bit area to which user data is mapped and a bit area to which CQI is mapped, a bit area to which delivery confirmation information may be mapped is provided. In this case, since there is no delivery confirmation information to be transmitted, no data is mapped in this bit area (DTX).

  In pattern 4, user data, delivery confirmation information, and CQI are transmitted in the subframe, and a bit area to which user data is mapped, a bit area to which delivery confirmation information is mapped, and a bit area to which CQI is mapped are provided. It has been. In this case, ACK and NACK exist as delivery confirmation information to be transmitted, and one of them is mapped based on the CRC check result of the corresponding downlink shared channel DL-SCH. That is, when the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped, and the corresponding downlink shared channel DL-SCH cannot be correctly received. In this case (when the CRC check result is NG), NACK is mapped.

  In the above-described example, the bit area to which the delivery confirmation information is mapped always exists at the head. In this way, by providing a bit area to which delivery confirmation information is mapped at the head, the bit area to which delivery confirmation information is mapped is fixed in all subframes regardless of whether or not CQI is transmitted. Therefore, the reception process of the base station device is simplified. However, the bit area to which the delivery confirmation information is mapped does not always need to exist at the head, and may be a place other than the head.

  Furthermore, in the above-described example, the acknowledgment information, CQI, and user data are multiplexed at the bit level, but the same mapping process may be performed at the symbol level. That is, irrespective of whether or not the delivery confirmation information is transmitted, the symbol area of the delivery confirmation information may be secured and the delivery confirmation information, CQI, and user data may be symbol mapped. In the case of modulating from bit to symbol, for example, BPSK, QPSK, 16QAM, 64QAM, or the like can be used.

  As shown in FIG. 5, in LTE, CQI and acknowledgment information and user data are time-multiplexed, so the case where bits are mapped in the time direction has been shown, but instead or in addition, the frequency direction (FDM) and / or (CDM) bits may be mapped in the code direction.

  In the above-described example, the CQI and the delivery confirmation information are transmitted on the uplink control channel. However, in addition to the CQI and the delivery confirmation information, a scheduling request, a release request, or the like may be transmitted. Good. Also in this case, in the embodiment according to the present invention, the bit area to which the delivery confirmation information is mapped is always set.

  Note that the user data, delivery confirmation information, and CQI bit mapping method shown in FIGS. 4 and 5 described above may be applied at the time of initial transmission of user data, or may be applied at the time of retransmission of user data. . That is, the bit mapping method may be applied to both the initial transmission of user data and the retransmission of user data, or may be applied to either the initial transmission of user data or the retransmission of user data. Good.

  Alternatively, the user data, the delivery confirmation information, and the CQI bit mapping method shown in FIGS. 4 and 5 described above are the IDs of users who communicate using the physical uplink shared channel by the downlink control channel, It may be applied when information on the transport format of user data is notified, or the ID of the user who communicates using the physical uplink shared channel by the downlink control channel, or the transport format of the user data This information may be applied when the information is not notified. That is, the above bit mapping method is applied both when the ID of a user who performs communication using the physical uplink shared channel and the information of the transport format of the user data are notified and when the information is not notified. It may be applied only to the case where the ID of the user who performs communication using the physical uplink shared channel and the information of the transport format of the user data are notified or the case where the information is not notified. Also good. Here, “when the user ID that communicates using the physical uplink shared channel and the information of the transport format of the user data are not notified by the downlink control channel” means that, for example, the user data is Refers to the case of resending.

  Alternatively, persistent scheduling is applied to the case where the ID of the user who communicates using the physical uplink shared channel and the information on the transport format of the user data are not notified by the downlink control channel. This may be a case where a shared uplink shared channel is transmitted. Here, persistent scheduling is a scheduling method that allocates data transmission opportunities at regular intervals according to the data type or the characteristics of the application that transmits and receives data. That is, the uplink shared channel (UL-SCH) to which persistent scheduling is applied is transmitted from the user apparatus to the base station apparatus in the predetermined subframe, and the transmission format in that case, That is, predetermined values are set for information on HARQ such as allocation information, modulation scheme, payload size, redundancy version parameter, process number, and the like of resource blocks that are frequency resources. That is, a shared channel (radio resource) is allocated in a predetermined subframe, and an uplink shared channel (UL-SCH) is transmitted in a predetermined transmission format. The predetermined subframe may be set to have a constant cycle, for example. The predetermined transmission format does not have to be one type, and a plurality of types may exist.

  When persistent scheduling is applied, in the downlink, resource allocation by persistent scheduling without using the downlink L1 / L2 control channel and resource allocation by dynamic scheduling are performed. Here, dynamic scheduling is a scheduling method in which downlink shared channel resources are allocated using a downlink L1 / L2 control channel. Therefore, even when persistent scheduling is applied, the downlink L1 / L2 control channel is configured by applying the user data, the delivery confirmation information, and the CQI bit mapping method shown in FIGS. 4 and 5 described above. It is possible to prevent the problem that the position where user data is mapped changes depending on whether it is wrong or not.

  Alternatively, the user data, acknowledgment information, and CQI bit mapping method shown in FIG. 4 and FIG. 5 described above is when user data is retransmitted, and a physical uplink shared channel is used by a downlink control channel. This may be applied when the ID of the user who performs communication and the information on the transport format of the user data is not notified.

By the way, when MIMO is applied in the downlink, the acknowledgment information for the downlink shared channel transmitted in the uplink may be 2 bits or more. Further, the number of bits of the delivery confirmation information is generally a value that can change based on downlink radio quality. For example, it may be 2 bits when the radio quality is good and 1 bit when the radio quality is bad. In this case, in order to prevent a mismatch in the number of bits of the delivery confirmation information between the mobile station 100 _n and the base station apparatus 200, a bit area of the delivery confirmation information is secured based on the maximum number of bits that can be taken. May be. For example, when there are two types of 1-bit and 2-bit as the number of bits of the delivery confirmation information, 2 bits are always secured as a bit area for the delivery confirmation information, and the bit mapping shown in FIG. A method may be applied.

  Details of an example of bit mapping in this case will be described with reference to FIGS. 13 and 14. In the figure, assuming that a maximum of two pieces of acknowledgment information are transmitted, the first acknowledgment information is described as ACK / NACK (1) (delivery acknowledgment information (1)). Is described as ACK / NACK (2) (delivery confirmation information (1)).

  In pattern 1 shown in FIG. 13, only user data is transmitted in the subframe, and neither delivery confirmation information (1), delivery confirmation information (2) nor CQI is transmitted. Nevertheless, in addition to the bit area to which user data is mapped, a bit area to which the delivery confirmation information (1) and the delivery confirmation information (2) may be mapped is provided. Since there is no acknowledgment information to be transmitted, this bit area does not contain significant information, that is, no signal is mapped (corresponding to an intermittent period in intermittent transmission (DTX)). More generally, for this bit area, it is prohibited to allocate power indicating that some data exists.

  In pattern 2, user data and acknowledgment information (1) are transmitted in the subframe, but no CQI is transmitted. Nevertheless, in addition to the bit area to which the user data is mapped and the bit area to which the delivery confirmation information (1) is mapped, a bit area to which the delivery confirmation information (2) may be mapped is provided. . In this case, in the bit area of the acknowledgment information (1), there are an acknowledgment (ACK) and a negative acknowledgment (NACK) as the acknowledgment information to be transmitted, and the corresponding downlink shared channel DL-SCH CRC check Based on the result, one of them is mapped. That is, when the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped, and the corresponding downlink shared channel DL-SCH cannot be correctly received. In this case (when the CRC check result is NG), NACK is mapped. For example, power corresponding to a signal component of “+1” is mapped to one of ACK and NACK, and power corresponding to a signal component of “−1” is mapped to the other. The power corresponding to “0” is mapped to the portion in the above DTX, which reflects that no data exists in the portion. On the other hand, regarding the acknowledgment information (2), since there is no acknowledgment information to be transmitted, this bit area does not contain significant information, that is, no signal is mapped (intermittent period in intermittent transmission (DTX)). Equivalent to More generally, for this bit area, it is prohibited to allocate power indicating that some data exists.

  In pattern 3, user data, delivery confirmation information (1), and delivery confirmation information (2) are transmitted in the subframe, but CQI is not transmitted. For this reason, a bit area to which user data is mapped, a bit area to which delivery confirmation information (1), and delivery confirmation information (2) are mapped are provided. In this case, an acknowledgment (ACK) and a negative acknowledgment (NACK) exist as the acknowledgment information (1) and the acknowledgment information (2) to be transmitted, respectively, and the corresponding downlink shared channel DL-SCH CRC check Based on the result, one of them is mapped. That is, for each of the acknowledgment information (1) and the acknowledgment information (2), if the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped. When the corresponding downlink shared channel DL-SCH cannot be correctly received (when the CRC check result is NG), NACK is mapped. For example, power corresponding to a signal component of “+1” is mapped to one of ACK and NACK, and power corresponding to a signal component of “−1” is mapped to the other.

  In the pattern 4 of FIG. 14, user data and CQI are transmitted in the subframe, but the delivery confirmation information (1) and the delivery confirmation information (2) are not transmitted. Nevertheless, in addition to the bit area to which user data is mapped and the bit area to which CQI is mapped, a bit area to which delivery confirmation information (1) and delivery confirmation information (2) may be mapped is provided. Yes. In this case, since there is no (1) to be transmitted and acknowledgment information (2), data is not mapped in this bit area (DTX). More generally, for this bit area, it is prohibited to allocate power indicating that some data exists. In pattern 5, user data, delivery confirmation information (1), and CQI are transmitted in the subframe, but delivery confirmation information (2) is not transmitted. Nevertheless, the acknowledgment information (2) may be mapped in addition to the bit area to which user data is mapped, the bit area to which CQI is mapped, and the bit area to which acknowledgment information (1) is mapped. A bit area is provided. In this case, in the bit area of the acknowledgment information (1), there are an acknowledgment (ACK) and a negative acknowledgment (NACK) as the acknowledgment information to be transmitted, and the corresponding downlink shared channel DL-SCH CRC check Based on the result, one of them is mapped. That is, when the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped, and the corresponding downlink shared channel DL-SCH cannot be correctly received. In this case (when the CRC check result is NG), NACK is mapped. For example, power corresponding to a signal component of “+1” is mapped to one of ACK and NACK, and power corresponding to a signal component of “−1” is mapped to the other. The power corresponding to “0” is mapped to the portion in the above DTX, which reflects that no data exists in the portion. On the other hand, regarding the acknowledgment information (2), since there is no acknowledgment information to be transmitted, this bit area does not contain significant information, that is, no signal is mapped (intermittent period in intermittent transmission (DTX)). Equivalent to More generally, for this bit area, it is prohibited to allocate power indicating that some data exists.

  In pattern 6, user data, delivery confirmation information (1), delivery confirmation information (2), and CQI are transmitted in the subframe. In this case, ACK and NACK exist as the acknowledgment information (1) and the acknowledgment information (2) to be transmitted, respectively, and based on the CRC check result of the corresponding downlink shared channel DL-SCH, One is mapped. That is, for each of the acknowledgment information (1) and the acknowledgment information (2), if the corresponding downlink shared channel DL-SCH is correctly received (when the CRC check result is OK), ACK is mapped. When the corresponding downlink shared channel DL-SCH cannot be correctly received (when the CRC check result is NG), NACK is mapped. For example, power corresponding to a signal component of “+1” is mapped to one of ACK and NACK, and power corresponding to a signal component of “−1” is mapped to the other.

  Note that the number of bits of the delivery confirmation information need not be limited to 1 bit or 2 bits, and may be 3 bits or more.

  Also, when MIMO is applied, as shown in the cases of FIGS. 4 and 5, the user data, the delivery confirmation information, and the CQI bit mapping method may be applied at the first transmission of user data, It may be applied when retransmitting user data. That is, the bit mapping method may be applied to both the initial transmission of user data and the retransmission of user data, or may be applied to either the initial transmission of user data or the retransmission of user data. Good.

  Alternatively, the bit mapping method of user data, delivery confirmation information, and CQI shown in FIG. 13 and FIG. 14 described above is based on the ID of the user who performs communication using the physical uplink shared channel by the downlink control channel, It may be applied when information on the transport format of user data is notified, or the ID of the user who communicates using the physical uplink shared channel by the downlink control channel, or the transport format of the user data This information may be applied when the information is not notified. That is, the above bit mapping method is applied both when the ID of a user who performs communication using the physical uplink shared channel and the information of the transport format of the user data are notified and when the information is not notified. It may be applied only to the case where the ID of the user who performs communication using the physical uplink shared channel and the information of the transport format of the user data are notified or the case where the information is not notified. Also good. Here, “when the user ID that communicates using the physical uplink shared channel and the information of the transport format of the user data are not notified by the downlink control channel” means that, for example, the user data is Refers to the case of resending.

  Alternatively, the user data, the acknowledgment information, and the CQI bit mapping method shown in FIG. 13 and FIG. 14 described above are when user data is retransmitted and the physical uplink shared channel is used by the downlink control channel. This may be applied when the ID of the user who performs communication and the information on the transport format of the user data is not notified.

  In this way, regardless of whether or not the delivery confirmation information is transmitted, a bit area to which the delivery confirmation information is mapped is always provided. Since the user data mapping position does not change depending on whether the downlink L1 / L2 control channel is incorrect or not, the base station apparatus can correctly demodulate and decode the user data in any case. It becomes.

The mobile station 100 _{n according} to the embodiment of the present invention will be described with reference to FIG.

In the figure, a 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. In the baseband signal processing unit 108, transmission processing of retransmission control (H-ARQ (Hybrid ARQ)), channel coding, IFFT processing, and the like are performed and transferred 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.

  The configuration of the baseband signal processing unit 108 will be described with reference to 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 performs channel decoding, FFT processing, and the like of a signal received on the downlink.

  Also, the layer 1 processing unit 1081 demodulates and decodes the downlink L1 / L2 control channel, which is the downlink control channel, included in the downlink received signal, and transmits the decoding result to the MAC processing unit 1082.

  Also, the layer 1 processing unit 1081 measures the received signal quality of the downlink reference signal (DL-RS: Downlink Reference Signal). The received signal quality may be expressed, for example, as a ratio of desired signal power to non-desired 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.

Furthermore, 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 subframe, and transmits the user data in the subframe. User data is received from the processing unit 1082.
The layer 1 processing unit 1081 performs processing such as encoding, data modulation, and bit mapping, DFT processing, subcarrier mapping processing, IFFT processing, and the like for the CQI, the delivery confirmation information, and the user data. These are transmitted to the transmission / reception unit as baseband signals.

  When the user data is not transmitted and 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. A process of mapping to (Uplink Control Channel) is performed.

  Further, when transmitting user data, the layer 1 processing unit 1081 uses the respective bit mapping methods in each of the four transmission patterns as shown in FIG. CQI bit mapping is performed. The details of the bit mapping are the same as described above, and will be omitted.

  The layer 1 processing unit 1081 may use the user data, delivery confirmation information, and CQI bit mapping method shown in FIGS. 5, 13, and 14 when transmitting user data for the first time or when retransmitting user data. May be. That is, the layer 1 processing unit 1081 may use the bit mapping method for both the initial transmission of user data and the retransmission of user data, and either the initial transmission of user data or the retransmission of user data. You may use only crab.

  Alternatively, the layer 1 processing unit 1081 uses the downlink control channel to communicate the user data, the delivery confirmation information, and the CQI bit mapping method shown in FIG. 5 and the like using the physical uplink shared channel. Or the user data transport format information may be notified, or the ID of a user who communicates using the physical uplink shared channel by the downlink control channel, or the user data transport. It may be used when port format information is not notified. That is, the layer 1 processing unit 1081 does not notify the bit mapping method when the ID of the user who performs communication using the physical uplink shared channel and the information of the transport format of the user data are notified. Either the user ID that communicates using the physical uplink shared channel or the information on the transport format of the user data, or the case where it is not notified It may be used only in the case. Here, “when the user ID that communicates using the physical uplink shared channel and the information of the transport format of the user data are not notified by the downlink control channel” means that, for example, the user data is Refers to the case of resending.

  Alternatively, persistent scheduling is applied to the case where the ID of the user who communicates using the physical uplink shared channel and the information on the transport format of the user data are not notified by the downlink control channel. This may be a case where a shared uplink shared channel is transmitted.

  Alternatively, the layer 1 processing unit 1081 uses the user data, the delivery confirmation information, and the CQI bit mapping method shown in FIG. 5 and the like when the uplink user data is retransmitted and is physically transmitted by the downlink control channel. You may use when the information of the user who communicates using an uplink shared channel, or the information of the transport format of the user data is not notified.

  Based on the decoding result of the downlink L1 / L2 control channel received from the layer 1 processing unit 1081, the MAC processing unit 1082 performs transmission processing such as determination of the transmission format of uplink user data and retransmission control in the MAC layer. That is, when the downlink L1 / L2 control channel received from the layer 1 processing unit 1081 is allowed to perform communication using the shared channel in the uplink, the transmission format determination or retransmission is performed for user data to be transmitted. Transmission processing such as control is performed, and the user data is given to the layer 1 processing unit 1081. If the downlink L1 / L2 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 for MAC retransmission control of downlink user data based on the decoding result of the downlink L1 / L2 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, delivery confirmation information is generated based on the CRC check result and notified to the layer 1 processing unit 1081. 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.

  If the MAC processing unit 1082 has not been notified by the downlink L1 / L2 control channel received from the layer 1 processing unit 1081 that communication using the shared channel in the downlink is performed, the downlink user data Processing without receiving is performed. As a result, processing for notifying delivery confirmation information or the like is not performed. In this case, the layer 1 processing unit 1081 determines that there is no delivery confirmation information to be transmitted on the next uplink.

  A base station apparatus 200 according to an embodiment of the present invention will be described with reference to FIG.

  The base station apparatus 200 according to the present embodiment 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 divides and combines user data, RLC layer transmission processing such as RLC (radio link control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ (Hybrid Automatic Repeat reQuest) ) Transmission processing, scheduling, transmission format selection, channel coding, and inverse fast Fourier transform (IFFT) processing are performed and 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 downlink L1 / L2 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 and the mobile station 110 _m to the base station apparatus 200 via the uplink, the radio frequency signal received by the transmission / reception antenna 202 is amplified by the amplifier unit 204, and the frequency is transmitted by the transmission / reception unit 206. It is converted into a baseband signal and input to the baseband signal processing unit 208.

  The baseband signal processing unit 208 performs FFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer reception processing on user data included in the input baseband signal. Via the access gateway device 300.

  Further, as will be described later, the baseband signal processing unit 208 performs power determination of a predetermined portion in the received signal in order to determine the presence / absence of acknowledgment information for the downlink shared channel transmitted in the past, and the mobile station It is determined whether or not the delivery confirmation information is actually transmitted. Based on this determination result, transmission processing for MAC retransmission control is performed.

  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.

  The configuration of the baseband signal processing unit 208 will be described with reference to 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, 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 and FFT processing of data transmitted in the uplink.

  The layer processing unit 2081 includes the ID of a user who performs communication using the physical downlink shared channel, information on the transport format of the user data, the ID of the user who performs communication using the physical uplink shared channel, Information on the transport format of the user data is received from the MAC processing unit 2082. The layer processing unit 2081 also includes the ID of the user who performs communication using the physical downlink shared channel, the information on the transport format of the user data, and the user who performs communication using the physical uplink shared channel. Transmission processing such as channel coding and IFFT processing is performed on the ID and information on the transport format of the user data. 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 the downlink L1 / L2 control channel, which is a downlink control channel.

  Further, the layer 1 processing unit 2081 also performs demodulation and decoding of CQI and delivery confirmation information mapped to the uplink control channel transmitted in the uplink. 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.

  When receiving user data in the uplink, the layer 1 processing unit 2081 performs mapping with each bit mapping method in each of the four transmission patterns illustrated in FIG. 5 and the six transmission patterns illustrated in FIGS. The user data, delivery confirmation information, and CQI are received. The details of the bit mapping are the same as described above, and will be omitted.

  The layer 1 processing unit 2081 may perform the reception process based on the user data, the delivery confirmation information, and the CQI bit mapping method illustrated in FIG. 5 or the like when the user data is transmitted for the first time or when the user data is retransmitted. May be. That is, the layer 1 processing unit 2081 may perform the above reception processing both when user data is first transmitted and when user data is retransmitted, or when user data is transmitted for the first time and when user data is retransmitted. You may only go to

  Alternatively, the layer 1 processing unit 2081 communicates the reception processing based on the user data, the delivery confirmation information, and the CQI bit mapping method illustrated in FIG. 5 and the like using the physical uplink shared channel by the downlink control channel. Or the ID of the user who performs communication using the physical uplink shared channel by the downlink control channel, You may perform when the information of the transport format of the user data is not notified. That is, when the layer 1 processing unit 2081 is notified of the ID of the user who performs communication using the physical uplink shared channel and the information of the transport format of the user data in the reception processing based on the bit mapping method. And when not notified, or when notified of the information of the user ID that communicates using the physical uplink shared channel and the transport format information of the user data. It may be done only in either case. Here, “when the user ID that communicates using the physical uplink shared channel and the information of the transport format of the user data are not notified by the downlink control channel” means that, for example, the user data is Refers to the case of resending.

  Alternatively, persistent scheduling is applied to the case where the ID of the user who communicates using the physical uplink shared channel or the information on the transport format of the user data is not notified by the downlink control channel. This may be a case where a shared uplink shared channel is transmitted.

  Alternatively, the layer 1 processing unit 2081 performs the reception processing based on the user data, the delivery confirmation information, and the CQI bit mapping method illustrated in FIG. 5 and the like at the time of retransmission of the user data and by the downlink control channel. It may be performed when the ID of the user who performs communication using the physical uplink shared channel or the information on the transport format of the user data is not notified.

As described above, the base station apparatus can predict in which subframe the CQI and delivery confirmation information should be included. However, although the delivery confirmation information should originally be included in the uplink signal, it may not actually be included. In this embodiment, the layer 1 processing unit 2081 determines whether or not delivery confirmation information is included in the received signal. The layer 1 processing unit 2081 determines whether or not the mobile station 100 _n has actually transmitted the delivery confirmation information when the user data is received in the uplink and the delivery confirmation information is also received. For example, the layer 1 processing unit 2081 measures the SIR of the received signal (uplink signal) to which the delivery confirmation information may be mapped, and when the SIR is larger than a predetermined threshold, the mobile station 100 _n actually When it is determined that the delivery confirmation information has been transmitted and the SIR is equal to or less than a predetermined threshold, the mobile station 100 _n may determine that the delivery confirmation information has not actually been transmitted. More generally, it may be determined whether or not delivery confirmation information or the like is included in the uplink signal according to a comparison result between the received signal quality and the threshold value. Then, the layer 1 processing unit 2081 notifies the MAC processing unit 2082 of the determination result of the power determination described above.

  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 MAC processing unit 2082 receives the determination result of the power determination regarding the delivery confirmation information from the layer 1 processing unit 2081. Then, if the determination result of the power determination is a determination result that the mobile station 100 _n did not actually transmit the delivery confirmation information, the MAC processing unit 2082 corresponds to the corresponding downlink shared channel transmitted in the past. Is retransmitted, the information mapped to the downlink shared channel transmitted in the past is retransmitted. For example, the MAC processing unit 2082 determines that the mobile station 100 _n did not normally receive the shared channel but did not normally receive the associated downlink L1 / L2 control channel, and the previous transmission is invalid. The information mapped to the downlink shared channel may be retransmitted assuming that the transmission is correct. That is, if the previous transmission is the first transmission, the transmission processing is performed as the first transmission, and if the previous transmission is the second transmission, the current transmission is also 2 Transmission processing may be performed as the second transmission.

  The RLC processing unit 2083 performs RLC layer transmission processing such as division / combination and RLC retransmission control transmission processing for downlink packet data, and division / combination and RLC retransmission control reception processing for uplink data. RLC layer reception processing is performed.

FIG. 10 is a diagram for explaining the processing of the mobile station 100 _n and the base station apparatus 200 described above from the viewpoint of time. For example, in the subframe of #i, the base station apparatus 200 receives the ID of the user who performs communication using the PDSCH of subframe #i, the information on the transport format of the user data, and the PUSCH of subframe # i + 3. Using the downlink control channel, the mobile station _100n is notified of the ID of the user using the communication and the information of the transport format of the user data (1002). In the #i subframe, the mobile station 100 _n receives the downlink control channel (1004). Then, when the ID of a user who performs communication using the PDSCH of subframe #i included in the downlink control channel is the ID of the own station, the mobile station 100 _n uses the downlink control channel. Based on the information of the included transport format, the PDSCH is received (1004). In addition, when the ID of the user who performs communication using the PUSCH of subframe # i + 3 included in the downlink control channel is the ID of the own station, the mobile station 100 _n uses the downlink control channel. The subframe PUSCH is transmitted based on the included transport format information (1006). Furthermore, when the PDSCH is received at timing 1004, the mobile station 100 _n transmits delivery confirmation information based on the CRC check result using the uplink control channel of subframe # i + 3 (1006). The base station apparatus 200 performs reception processing of delivery confirmation information from the mobile station that has notified that communication using PDSCH is performed in subframe #i at timing 1002 (1008). Further, base station apparatus 200 performs PUSCH reception processing from the mobile station that has notified that communication using PUSCH is performed in subframe # i + 3 at timing 1002. In the example described above, the subframe in which the PDSCH delivery confirmation information in subframe #i is transmitted matches subframe # i + 3 in which PUSCH is transmitted, but it does not have to match. Further, scheduling in PDSCH and PUSCH is generally performed independently.

  The uplink user data, acknowledgment information, and CQI bit mapping method according to the present invention are applied in the above 1006 and 1008. Note that FIG. 10 shows a case in which the ID of a user who communicates using PUSCH and the information on the transport format of the user data are notified by the downlink control channel. However, communication using PUSCH is performed. Even when the ID of the user to be performed and the information of the transport format of the user data are not notified by the downlink control channel, the user data, the acknowledgment information and the CQI bit mapping method according to the present invention are applied. Can be done. More specifically, it is a case where uplink user data is retransmitted, and the ID of the user who performs communication using PUSCH and the information of the transport format of the user data are notified by the downlink control channel. Otherwise, the uplink user data, acknowledgment information, and CQI bit mapping method according to the present invention may be applied. Alternatively, more specifically, when an uplink shared channel to which persistent scheduling is applied is transmitted, the uplink user data, acknowledgment information, and CQI bit mapping method according to the present invention are applied. May be.

A communication control method used in the mobile station according to the present embodiment will be described with reference to FIG. In FIG. 11, it is assumed that the mobile station 100 _n transmits user data using a shared channel in the uplink of the subframe.

The mobile station 100 _n determines whether or not to transmit acknowledgment information related to the downlink shared channel in the subframe (step S1102).

When sending acknowledgment information (Step S1102: YES), the mobile station 100 _n transmits acknowledgment information based on the CRC check result of the downlink shared channel (step S1104).

On the other hand, if no transmitted the acknowledgment information (Step S1102: NO), the mobile station 100 _n, sets the bit region acknowledgment information is mapped, the mapping of data in the bit area is prohibited (DTX) . That is, no signal is transmitted in the bit area (step S1106).

In the communication control method shown in FIG. 11 described above, the mobile station 100 _n receives control information for the shared channel transmitted in the uplink of the subframe in a previously determined subframe. It may be applied only if not. Here, the control information refers to the ID of a user who performs communication using the uplink shared channel notified by the downlink control channel, and information on the transport format of the user data. Here, “when the control information for the shared channel to be transmitted in the uplink of the subframe has not been received in the predetermined previous subframe” means that, for example, persistent scheduling is applied. The uplink shared channel may be transmitted. Alternatively, the above-described communication control method illustrated in FIG. 11 may be applied only when the uplink shared channel is retransmission. Alternatively, in the communication control method shown in FIG. 11 described above, the uplink shared channel is retransmitted, and the mobile station 100 _n transmits control information for the shared channel transmitted in the uplink of the subframe. It may be applied only when it is not received in a previously determined previous subframe.

A communication control method used in the base station apparatus according to the present embodiment will be described with reference to FIG. In Figure 12, the base station apparatus 200 in uplink of a certain subframe, delivery directly and the mobile station 100 _n has a downlink shared channel that user data is mobile station 100 _n transmits using a shared channel Assume that it is indirectly instructing to send confirmation information. The transmission timing of the transmission packet and the transmission timing of the delivery confirmation information for the transmission packet are fixedly or dynamically determined between the base station apparatus and the mobile station. Specifically, after the base station apparatus 200 transmits a certain packet to the mobile station 100 _{n in} a certain subframe, the mobile station 100 _n is in a subframe after a predetermined time interval from the subframe. It is scheduled to send delivery confirmation information.

The base station apparatus 200 measures the SIR of the signal to which the delivery confirmation information is mapped, and determines whether the SIR is greater than a predetermined threshold (step S1202). When the SIR of the signal to which the delivery confirmation information is mapped is larger than the predetermined threshold (step S1202: YES), the base station apparatus 200 determines that the mobile station _100n has actually transmitted the delivery confirmation information (step S1204). ).

On the other hand, when the SIR of the signal acknowledgment information is mapped it is equal to or smaller than the predetermined threshold (step S1202: NO), the base station apparatus 200, determines that the mobile station 100 _n has not actually transmitted the acknowledgment information (Step S1206). At this time, the base station apparatus 200 may retransmit the downlink shared channel corresponding to the delivery confirmation information.

  According to the embodiment of the present invention, by always ensuring the bit area of the delivery confirmation information, the mobile station cannot properly receive information on which mobile station performs communication using the shared channel. However, if the mobile station can properly receive the uplink scheduling information, the base station apparatus can correctly receive a normal data signal on the uplink.

  In the above-described embodiments, examples of a system to which Evolved UTRA and UTRAN (also known as Long Term Evolution or Super 3G) are applied have been described. However, the mobile station, base station apparatus, and mobile communication system according to the present invention have been described. The communication control method can also be applied to other systems that perform communication using a shared channel.

It is a block diagram which shows the structure of the radio | wireless communications system based on one Example of this invention. It is explanatory drawing which shows the example of a mapping of an uplink control channel. It is explanatory drawing which shows the structural example of a sub-frame. It is explanatory drawing which shows the transmission pattern of delivery confirmation information, CQI, and user data. It is explanatory drawing which shows the channel mapping example in each transmission pattern. It is a partial block diagram which shows the mobile station which concerns on one Example of this invention. It is a block diagram which shows the baseband signal processing part of the mobile station which concerns on one Example of this invention. It is a partial block diagram which shows the base station apparatus which concerns on one Example of this invention. It is a block diagram which shows the baseband signal processing part of the base station apparatus which concerns on one Example of this invention. It is explanatory drawing which shows the time relationship of the process of the mobile station which concerns on one Example of this invention, and a base station apparatus. It is a flowchart which shows the communication control method used with the mobile station which concerns on one Example of this invention. It is a flowchart which shows the communication control method used with the base station apparatus which concerns on one Example of this invention. It is explanatory drawing (the 1) which shows another example of channel mapping in each transmission pattern. It is explanatory drawing (the 2) which shows another example of channel mapping in each transmission pattern.

Explanation of symbols

50 cells 100 ₁ , 100 ₂ , 100 ₃ , 100 _n mobile station 102 transmitting / receiving antenna 104 amplifier unit 106 transmitting / receiving unit 108 baseband processing unit 110 application unit 1081 layer 1 processing unit 1082 MAC processing unit 200 base station device 202 transmitting / receiving antenna 204 amplifier Unit 206 Transceiver 208 Baseband signal processor 210 Call processor 212 Transmission path interface 2081 Layer 1 processor 2082 MAC processor 2083 RLC processor 300 Access gateway device 400 Core network

Claims (17)

A user apparatus that wirelessly communicates with a base station apparatus in a mobile communication system:
Receiving means for receiving the first shared channel in the downlink;
A transmission means for transmitting the acknowledgment information of the first shared channel and the second shared channel in the uplink;
Even if the uplink signal does not require delivery confirmation information, it is prohibited to map the second shared channel in the bit area for the delivery confirmation information. The user device according to claim 1,
A user apparatus characterized in that, in an uplink signal that does not require delivery confirmation information, it is prohibited to allocate power indicating that some data exists in a bit area for delivery confirmation information. The user device according to claim 1,
A user apparatus characterized in that mapping of downlink reception quality information to a bit area for acknowledgment information is also prohibited. The user device according to claim 1,
The user is characterized in that the part representing the second shared channel and the part representing the acknowledgment information are multiplexed by one or more of time division multiplexing, frequency division multiplexing and code division multiplexing. apparatus. The user device according to claim 1,
When a downlink control channel for the first shared channel is not transmitted,
The user apparatus characterized in that the second shared channel is prohibited from being mapped to the bit area for the delivery confirmation information even for an uplink signal that does not require the delivery confirmation information. The user device according to claim 1,
When persistent scheduling is applied to the second shared channel,
The user apparatus characterized in that the second shared channel is prohibited from being mapped to the bit area for the delivery confirmation information even for an uplink signal that does not require the delivery confirmation information. The user device according to claim 1,
When the second shared channel is retransmitted,
The user apparatus characterized in that the second shared channel is prohibited from being mapped to the bit area for the delivery confirmation information even for an uplink signal that does not require the delivery confirmation information. A base station apparatus that performs radio communication with a user apparatus in a mobile communication system,
A transmission means for transmitting the first shared channel in the downlink;
Receiving means for receiving the acknowledgment information of the first shared channel and the second shared channel in the uplink;
Means for extracting and decoding a second shared channel mapped outside the bit region for acknowledgment information;
A base station apparatus comprising: The base station apparatus according to claim 8, wherein
When the downlink control channel for the first shared channel does not transmit,
A base station apparatus characterized by extracting and decoding a second shared channel mapped outside the bit area for delivery confirmation information. The base station apparatus according to claim 8, wherein
When persistent scheduling is applied to the second shared channel,
A base station apparatus characterized by extracting and decoding a second shared channel mapped outside the bit area for delivery confirmation information. The base station apparatus according to claim 8, wherein
When the second shared channel is retransmitted,
A base station apparatus characterized by extracting and decoding a second shared channel mapped outside the bit area for delivery confirmation information. The base station apparatus according to claim 8, wherein
A user apparatus characterized by extracting and decoding downlink reception quality information mapped outside the bit area for delivery confirmation information. The base station apparatus according to claim 8, wherein
A base station apparatus, further comprising: a determination unit that determines whether or not delivery confirmation information is included in an uplink signal received after transmission of the first shared channel. The base station apparatus according to claim 13, wherein
The base station apparatus further comprising: a retransmission unit configured to retransmit the first shared channel when the determination unit confirms that the delivery confirmation information is not included. The base station apparatus according to claim 13, wherein
The base station apparatus characterized in that determination by the determination means is performed based on received signal quality of a signal portion that may include acknowledgment information in an uplink signal. A mobile communication system having a user apparatus and a base station apparatus that communicates with the user apparatus, wherein the user apparatus is
Receiving means for receiving the first shared channel in the downlink;
Transmitting means for transmitting the acknowledgment information of the first shared channel and the second shared channel in uplink;
Even if the uplink signal does not require delivery confirmation information, the second shared channel is prohibited from being mapped to the bit area for the delivery confirmation information.
Transmitting means for transmitting the first shared channel in the downlink;
Receiving means for receiving the acknowledgment information of the first shared channel and the second shared channel on the uplink;
Means for extracting and decoding a second shared channel mapped outside the bit region for acknowledgment information;
A mobile communication system comprising: A method used in a mobile communication system having a user apparatus and a base station apparatus communicating with the user apparatus,
Transmitting a first shared channel from the base station apparatus to the user apparatus;
An uplink signal that may include delivery confirmation information of the first shared channel in addition to the second shared channel is transmitted from the user apparatus to the base station apparatus;
And the user apparatus is prohibited from mapping the second shared channel to the bit area for the delivery confirmation information even in the uplink signal that does not require the delivery confirmation information.
A method characterized by that.

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