JP2009239957A - Transmitter and allocation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitter capable of allocating a radio resource in accordance with the type of physical channel, and to provide a radio resource allocation method. <P>SOLUTION: The frequency blocks are formed of a plurality of frequency axial subcarriers and a plurality of time axial OFDM symbols in a transmitter. The time axial length of the frequency block is equivalent to the transmission slot. The frequency blocks are arranged in the frequency axis direction over the system frequency bandwidth. The transmitter includes a first allocation part for allocating a plurality of control signaling channels to the OFDM symbol at the leading section in the frequency blocks, and a second allocation part for allocating a share channel to a part different from the OFDM symbol allocated the control signaling channel in the frequency blocks. The first allocation part applies code multiplexing to the control signaling channels. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission apparatus and a radio resource allocation method.

  In the UMTS (Universal Mobile Telecommunications System) method, which is one of the third generation mobile communication methods (3G), as a method for realizing high-speed packet transmission on a link from a base station to a mobile station (hereinafter referred to as a downlink). HSDPA (High Speed Downlink Packet Access) has been standardized.

  In HSDPA, in order to increase the realizable throughput, users connected to the base station share radio resources (hereinafter referred to as a shared packet channel), and the base station gives priority to the radio resources with good propagation conditions. A packet scheduling technique to be assigned to is applied.

  In HSDPA, signal transmission of a single carrier is performed in a channel bandwidth of 5 MHz. Therefore, the data transmitted through the shared packet channel uses the entire channel bandwidth of 5 MHz, and is transmitted to each user. Allocation is basically performed based on time multiplexing. Further, in order to realize this shared packet channel transmission, the control channel for notifying which user the corresponding transmission slot is allocated is also transmitted using a 5 MHz full channel bandwidth.

  On the other hand, studies on standardization of UMTS Long Term Evolution (LTE) have begun, and research on the 4G mobile communication system (4G), which is the 3G next generation mobile communication system, is underway. . 3G LTE and 4G systems can flexibly support multi-cell environments such as cellular systems, and isolated cell environments such as hotspot areas and indoors, and increase frequency utilization efficiency in both cell environments. It is desired.

  OFDM (Orthogonal Frequency Division Multiplexing) that transmits signals using a large number of subcarriers is considered to be a strong candidate as a radio access method applied to the downlink in 3G LTE or 4G (for example, Non-patent document 1).

  In OFDM, a data sequence to be transmitted is serial-parallel converted, and a signal of a parallel data sequence is transmitted using a plurality of subcarriers. As a result, the symbol rate becomes low, so that the influence of delayed waves (multipath) caused by the difference in the propagation path from the transmitter to the receiver can be suppressed, and high-speed information rate signals can be transmitted with high quality. It becomes possible.

  Further, in order to support a multi-cell environment by a radio access scheme using OFDM, it is considered desirable to apply 1-cell frequency repetition in order to realize a large capacity. When one-cell frequency repetition is realized, application of spreading is effective in order to suppress the influence of interference signals using the same frequency from neighboring neighboring cells.

Therefore, in OFDM with spreading (OFDM with Spreading), as shown in FIG. 1, the input data is subjected to channel coding, data modulation, spreading, and serial-parallel conversion and inverse Fourier transform are performed. A multicarrier signal is generated and transmitted with a guard interval inserted. Specifically, when spreading is applied, for example, when a spreading factor of 8 is applied, each symbol is spread and transmitted on 8 subcarriers. Further, when the influence of interference from neighboring cells is small, it is not necessary to use spreading, so 1 is applied as the spreading factor, and different data D ₁ , D ₂ ,.

  Even with OFDM and OFDM with spreading as described above, it is possible to apply a packet scheduling technique using a shared channel similar to HSDPA, thereby increasing throughput. In this case, since the multi-carrier transmission is performed in OFDM in the transmission of the shared channel, not only a method of assigning a transmission slot to each user by time multiplexing such as HSDPA but also a subcarrier unit or a plurality of sub-carriers. A radio resource can be allocated to each user for each frequency block unit in which carriers are bundled (see, for example, Non-Patent Document 2).

  Therefore, when signal transmission using multicarrier transmission is performed within the channel bandwidth, a radio resource allocation method different from HSDPA becomes possible.

  However, in order to realize actual mobile communication in such OFDM and OFDM using spreading, not only the transmission of such a shared channel, but also the control channel necessary for transmitting the control information of the shared channel, Alternatively, it is necessary to transmit a common control channel that transmits system information and paging information transmitted to all users connected to the base station.

J. A. C. Bingham, "Multicarrier modulation for data transmission: an idea whose time has come," IEEE Commun. Mag., Pp. 5-14, May 1990. W. Wang, T. Ottosson, M. Sternad, A. Ahlen, A. Svensson, "Impact of multiuser diversity and channel variability on adaptive OFDM," IEEE VTC2003-Fall, pp.547-551, Oct. 2003.

  However, multicarrier transmission in which signals are transmitted using a plurality of subcarriers described above has the following problems.

  In the downlink, there is a problem that it has not been clarified how radio resources are optimally allocated to physical channels that transmit different types of information.

  Therefore, an object of the present invention is to provide a transmitting apparatus and a radio resource allocation method that can allocate radio resources according to the types of physical channels.

In order to solve the above problem, the transmission device
This transmission device
A frequency block is formed by a plurality of subcarriers in the frequency axis direction and a plurality of OFDM symbols in the time axis direction, the length of the frequency block in the time axis direction corresponds to a transmission slot, and the frequency block has a frequency over the system frequency band. A first allocating unit that is arranged in a plurality in the axial direction and allocates a plurality of control signaling channels to the first OFDM symbol in the frequency block;
A second allocating unit that allocates a shared channel to a part of the frequency block that is different from the OFDM symbol to which the control signaling channel is allocated;
The first assigning unit code-multiplexes a plurality of control signaling channels.

  With this configuration, radio resources can be allocated according to the type of physical channel.

This allocation method is
A frequency block is formed by a plurality of subcarriers in the frequency axis direction and a plurality of OFDM symbols in the time axis direction, the length of the frequency block in the time axis direction corresponds to a transmission slot, and the frequency block has a frequency over the system frequency band. Assigning a plurality of control signaling channels to the OFDM symbol of the head portion in the frequency block, a plurality of which are arranged in the axial direction;
Allocating a shared channel to a part of the frequency block different from the OFDM symbol to which the control signaling channel is allocated, and
The step of assigning the control signaling channel code-multiplexes a plurality of control signaling channels.

  In this way, radio resources can be allocated according to the type of physical channel, and information to be transmitted on each physical channel can be transmitted to the user.

  According to the embodiment of the present invention, it is possible to realize a transmission apparatus and an allocation method that can allocate radio resources according to the types of physical channels.

It is explanatory drawing which shows the OFDM communication system which applied spreading | diffusion. It is explanatory drawing which shows the classification | category of a physical channel. It is a block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows the combination of a reception quality level, a data modulation system, and a code rate. It is explanatory drawing which shows the allocation of the radio | wireless resource to a common control channel, a control signaling channel, and a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a common control channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a common control channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a common control channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a common control channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a common control channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a control signaling channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a control signaling channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a control signaling channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a control signaling channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a control signaling channel. It is a block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows the example of application of time multiplexing. It is explanatory drawing which shows the example of application of time multiplexing. It is a block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows the example of combined use of frequency multiplexing. It is explanatory drawing which shows the example of combined use of frequency multiplexing. It is a block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows the example of application of code multiplexing. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is explanatory drawing which shows allocation of the radio | wireless resource to a multicast channel and another physical channel. It is explanatory drawing which shows multiplexing of a high-speed data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of the user of high-speed mobility. It is explanatory drawing which shows multiplexing of the user of high-speed mobility. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows multiplexing of a low data rate user. It is explanatory drawing which shows allocation of the radio | wireless resource to a shared channel. It is a flowchart which shows operation | movement of the transmitter concerning one Example of this invention.

  Next, embodiments of the present invention will be described 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.

  First, a physical channel in the downlink targeted in the embodiment of the present invention will be described with reference to FIG.

  The physical channels in the downlink targeted in this embodiment are a common control channel, a shared channel, a channel for transmitting physical layer control information and layer 2 control information (hereinafter referred to as a control signaling channel), It is classified as a multicast channel.

  The common control channel is a channel that is transmitted to the entire cell covered by the base station, and transmits, for example, broadcast information, paging information, and the like.

  The shared channel transmits traffic data to each user, control signal data using higher layer signals, and the like. For example, the control signal using the upper layer signal includes ACK / NACK indicating the presence / absence of a reception error in TCP / IP.

  The control signaling channel transmits, for example, modulation scheme in adaptive modulation, coding rate information, and the like as physical layer control information. Also, the control signaling channel transmits, for example, radio resource allocation information, for example, information indicating which symbols and subcarriers are allocated, as physical layer control information.

  Also, the control signaling channel transmits, for example, packet retransmission control information as layer 2 control information. In addition, the control signaling channel transmits, for example, packet scheduling assignment information as layer 2 control information.

  The multicast channel is a channel for multicast.

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

  The transmission device is provided in a base station, for example, and transmits a downlink channel.

  The transmission apparatus 100 transmits the common control channel and the control signaling channel using the entire frequency band or at least a part of the frequency bands that are discretely arranged over the entire frequency band. By doing so, it is possible to obtain a diversity effect in the frequency domain.

  Moreover, the transmission apparatus 100 divides | segments a time domain and a frequency domain, and transmits a shared channel based on the packet scheduling which allocates the place with a favorable reception state with respect to a user. By doing in this way, the multiuser diversity effect can be acquired.

  The transmission apparatus 100 may transmit the shared channel based on time domain packet scheduling using the entire channel band. By doing so, a frequency diversity effect can be obtained.

  Transmitting apparatus 100 includes common control channel signal generation section 110, control signaling channel signal generation section 120, shared channel signal generation section 130, common control channel signal generation section 110, control signaling channel signal generation section 120, and shared channel signal. A radio resource allocation unit 140 connected to the generation unit 130, an IFFT unit 150 connected to the radio resource allocation unit 140, and a guard interval insertion unit 160 connected to the IFFT unit 150 are provided.

  Common control channel signal generation section 110 is connected to channel coding section 102 to which transmission data to be transmitted on the common control channel is input, data modulation section 104 connected to channel coding section 102, and data modulation section 104. And a diffusion unit 106. The spreading unit 106 is connected to the radio resource allocation unit 140.

  The shared channel signal generation unit 130 includes a packet scheduling unit 128 to which data from each user is input, a channel encoding unit 122 connected to the packet scheduling unit 128, and a data modulation unit connected to the channel encoding unit 122. 124 and a diffusion unit 126 connected to the data modulation unit 124. The spreading unit 126 is connected to the radio resource allocation unit 140.

  The control signaling channel signal generation unit 120 is connected to the channel encoding unit 112 connected to the packet scheduling unit 128 serving as a scheduling unit, the data modulation unit 114 connected to the channel encoding unit 112, and the data modulation unit 114. And a diffusion unit 116. The spreading unit 116 is connected to the radio resource allocation unit 140.

  Data from each user is input to the packet scheduling unit 128. The packet scheduling unit 128 performs packet scheduling for selecting a user to be allocated to the shared channel based on feedback information indicating a radio state transmitted from each user (receiving station). For example, the packet scheduling unit 128 divides the time domain and the frequency domain, and allocates a place with a good radio state to the user.

  Further, the packet scheduling unit 128 determines a channel coding rate and a data modulation scheme for the selected user. Further, the packet scheduling unit 128 determines a spreading factor for the selected user. For example, in the packet scheduling unit 128, based on the information indicating the data modulation scheme and the coding rate with respect to the reception quality level shown in FIG. 4 so that the most efficient transmission can be performed according to a preset algorithm, the data modulation scheme and Determine the coding rate.

  In the information indicating the data modulation scheme and coding rate with respect to the reception quality level, a data modulation scheme with a large modulation multi-level number and a coding value with a large value are defined as the reception quality level is good. For example, the data modulation scheme is defined as QPSK, 16QAM, 64QAM as the reception quality level is improved, and the coding rate is increased from 1/9 to 3/4 as the reception quality level is improved. A value is specified. The data modulation scheme and coding rate specified here are changed depending on the environment where the transmission apparatus is installed, the cell, and the like.

  Further, the packet scheduling unit 128 uses at least one of information obtained by packet scheduling, for example, a user ID indicating the selected user, a spreading factor used for transmission to the user, a channel coding rate, and a data modulation scheme. The indicated information is input as control information to channel coding section 112, data modulation section 124 and spreading section 126.

  In addition, the packet scheduling unit 128 inputs user transmission data selected by packet scheduling to the channel coding unit 122, and this information is input to the data modulation unit 124.

  Channel coding section 122 performs channel coding on transmission data according to the channel coding rate selected by packet scheduling section 128 and inputs the data to data modulation section 124.

  The data modulation unit 124 performs data modulation on the transmission data subjected to channel coding in accordance with the data modulation scheme selected by the packet scheduling unit 128 and inputs the data to the spreading unit 126.

  The spreading unit 126 spreads the transmission data subjected to data modulation with the spreading factor selected by the packet scheduling unit 128 and inputs the transmission data to the radio resource allocation unit 140.

  On the other hand, the control information input to the channel encoding unit 112 by the packet scheduling unit 128 is subjected to channel encoding according to a preset channel encoding rate in the channel encoding unit 112 and input to the data modulation unit 114. Is done.

  The data modulation unit 114 performs data modulation on the control information subjected to channel coding in accordance with a preset data modulation scheme, and inputs the data to the spreading unit 116.

  Spreading section 116 spreads the control information subjected to data modulation according to a preset spreading factor, and inputs it to radio resource allocating section 140.

  Information transmitted through the common control channel is input to channel coding section 102, channel coded according to a preset channel coding rate, and input to data modulating section 104.

  Data modulation section 104 performs data modulation on transmission data subjected to channel coding in accordance with a preset data modulation scheme, and inputs the data to spreading section 106.

  Spreading section 116 spreads the transmission data subjected to data modulation in accordance with a preset spreading factor, and inputs it to radio resource allocating section 140.

  The channel coding rate used in the channel coding units 102 and 112, the data modulation scheme used in the data modulation units 104 and 114, and the spreading rate used in the spreading units 106 and 116 are changed depending on the environment and cells (sectors). Is possible.

  The radio resource allocation unit 140 allocates radio resources to the common control channel, control signaling channel, and shared channel.

  This will be described with reference to FIG.

  For example, when allocating radio resources to the common control channel and the control signaling channel, the radio resource allocation unit 140 assigns all frequency bands allocated to the system to a plurality of subcarriers of one subcarrier or more as shown in Configuration 1. The carrier is divided into subcarrier blocks, and at least one subcarrier block is assigned to a transmission slot indicating a transmission unit (TTI: Transmission Time Interval) in packet transmission.

  In addition, when allocating radio resources to the shared channel, the radio resource allocation unit 140 allocates radio resources other than those to which the common control channel and the control signaling channel are allocated. As described above, the common control channel and the control signaling channel are mapped to the discrete frequency domain over the entire frequency band, so that the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, as shown in Configuration 2, when radio resources are allocated to the common control channel and the control signaling channel, in the transmission slot indicating one unit of transmission (TTI: Transmission Time Interval) in packet transmission, the transmission slot is set to You may make it allocate at least one part symbol to the common control channel and a control signaling channel among several symbols which comprise.

  Also, in this case, when allocating radio resources to the shared channel, the radio resource allocation unit 140 allocates symbols other than the symbols assigned with the common control channel and control. In this way, since the common control channel and the control signaling channel can be mapped over the entire frequency band, the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, as shown in Configuration 3, when allocating radio resources to the common control channel and the control signaling channel, the radio resource allocating unit 140 uses the entire frequency band allocated to the system in the frequency axis direction as one subcarrier. The subcarrier blocks are divided into a plurality of subcarriers as described above, and are divided into a plurality of OFDM symbols in the time axis direction, and a frequency block is formed by the plurality of subcarriers and the plurality of OFDM symbols.

  The radio resource allocation unit 140 may select at least one frequency block from among a plurality of frequency blocks and allocate it to the common control channel and the control signaling channel. Further, at least some of the plurality of OFDM symbols constituting the frequency block may be assigned to the common control channel and the control signaling channel.

  Further, in this case, when allocating radio resources to the shared channel, the radio resource allocation unit 140 may allocate at least one of symbols and frequency blocks other than the common control channel and the symbols to which control is allocated. . In this way, the common control channel and the control signaling channel can be mapped to the discrete frequency domain of the entire frequency band, so that the reception quality at the receiver can be improved due to the frequency diversity effect.

  The IFFT unit 150 performs high-speed inverse Fourier transform on the input signal and performs OFDM modulation.

  The GI addition unit 160 creates a symbol in the OFDM scheme by adding a guard interval to a signal to be transmitted. The guard interval is obtained by duplicating the beginning or end part of the symbol to be transmitted.

  Hereinafter, allocation of radio resources will be specifically described separately for a common control channel, a control signaling channel, and a common channel.

  First, radio resource allocation to the common control channel will be described with reference to FIGS. 6A to 6E.

  The common control channel is information for all users in the cell. Furthermore, the users in the cell need to be able to receive at the required location rate and the required quality, eg, a predetermined error rate. For this reason, when transmission is performed only in a predetermined narrow frequency band among all frequency bands, the reception state at that frequency differs for each user, and in some cases, a user with a poor reception state may occur. Moreover, since it is information for all users, it cannot be used in such a way that it is assigned to packet scheduling and signal transmission is performed.

  Therefore, in the common control channel, packet scheduling is not applied, and the channel is allocated to the entire frequency band or at least a part of the frequency bands discretely arranged over the entire frequency band. By doing so, a frequency diversity effect can be obtained.

  For example, when radio resources are allocated to the common control channel, as shown in Configuration 1, the common control channel is allocated to at least one transmission slot, and all frequency bands are used in the allocated transmission slot. Is transmitted. By using the entire frequency band in this way, the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the common control channel, as shown in Configuration 2, the entire frequency band allocated to the system is divided into subcarrier blocks configured by a plurality of subcarriers, and at least one subcarrier is allocated. The common control channel is continuously mapped to the carrier block. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the common control channel, as shown in Configuration 3, by combining Configurations 1 and 2, the common control channel is mapped to at least one subcarrier block of at least one transmission slot. . Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the common control channel, as shown in configuration 4, the common control channel is allocated to some symbols in at least one transmission slot, and all symbols are allocated in the allocated symbols. Transmission is performed using a frequency band. By using the entire frequency band in this way, the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the common control channel, as shown in Configuration 5, the entire frequency band allocated to the system is divided into subcarrier blocks composed of a plurality of subcarriers, and at least one subcarrier is allocated. The common control channel is continuously mapped to some subcarriers in the carrier block. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  In addition, when radio resources are allocated to the common control channel, as shown in Configuration 6, a combination of Configurations 3 and 4, and a part of at least one subcarrier block of at least one transmission slot symbol The common control channel is mapped to the subcarriers. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the common control channel, as shown in the configuration example 7, the common control channel is mapped to some symbols of at least one subcarrier block of at least one transmission slot. In this case, in each transmission slot, the position of the common control channel to be mapped is arranged to be different in at least some of the subcarrier blocks. Thus, by mapping the common control channel in the frequency direction and the time axis direction, the reception quality at the receiver can be improved by the time diversity effect in addition to the frequency diversity effect. For example, when the receiver is moving at high speed, the reception quality at a certain frequency may drop at a certain moment. In such a case, by making the position of the common control channel mapped in each subcarrier block different in at least some subcarrier blocks, a time diversity effect can be obtained and reception quality is improved. be able to.

  When radio resources are allocated to the common control channel, as shown in the configuration example 8, the transmission slot described in the configuration example 7 may be transmitted a predetermined number of times with a predetermined time interval. Thus, by transmitting the same transmission slot a plurality of times, the reception quality at the receiver can be improved by the time diversity effect in addition to the frequency diversity effect. In this case, the time interval for transmitting the transmission slot is adaptively controlled according to the environment. For example, the transmission interval is set to be long in an environment such as an office where there is little movement, and the transmission interval is set to be short in an environment such as in a city where movement is large. Further, the position of the common control channel mapped to a part of symbols of at least one subcarrier block of the transmission slot transmitted after the second time is set different from the position of the common control channel transmitted last time. Also good.

  Here, as shown in configuration example 9, the position of the common control channel in each subcarrier block described in configuration example 7 and configuration example 8 is fixedly determined in advance based on a predetermined rule. Further, the position of the common control channel in each subcarrier block may be determined randomly in each subcarrier as shown in Configuration Example 10.

  Further, in the configuration example 8, as shown in FIG. 6E, the same information as that of the first time is transmitted to the common control channel transmitted after the second time. In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive a common control channel transmitted after the second time. If there is a demodulation error, the information is discarded, and the common control channel transmitted after the second time is demodulated again (no packet synthesis, Type-I).

  If there is a demodulation error, the information is not discarded, and the common control channel transmitted after the second time and the previously received common control channel may be packet-combined and demodulated again (packet combining). Yes, Type-I). By doing so, the reception SIR can be improved.

  In the configuration example 8, the common control channel transmitted after the second time may be transmitted with information different from the first time. For example, the common control channel transmitted after the second time may be transmitted with a packet punctured with a pattern different from the first time (with packet synthesis, Type-II). In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive the common control channel transmitted after the third time. If there is a demodulation error, the information may not be discarded, and the common control channel transmitted after the second time and the previously received common control channel may be combined and demodulated again. In this way, the coding gain can be improved.

  In the configuration example 8, the common control channel transmitted after the second time may be transmitted with information different from the first time. For example, information indicating the common control channel is divided into two or more and transmitted. Information is stored in the common control channel transmitted for the first time, and when the redundant code is stored for the common control channel transmitted for the second time or later, the common control channel transmitted for the first time If the reception of the common control channel fails, the common control channel transmitted after the second time cannot be decoded.

  In such a case, by dividing the information indicating the common control channel into two or more and transmitting the information, the quality of the received product in the receiver can be improved due to the effect of time diversity. In this case, a transmission slot that divides and transmits information indicating the common control channel and a packet that stores a redundant code may be transmitted.

  In this case, it is necessary to determine the number of divisions of the common control channel in advance between the transmitter and the receiver. As information to be determined in advance, a packet number for packet synthesis, a puncture pattern and a constellation, and a bit indicating a new or retransmitted packet are required. The bit indicating that it is a new or retransmitted packet is necessary in order to avoid incorrect combining in consideration of ACK / NACK bit errors.

  Next, radio resource allocation to the control signaling channel will be described with reference to FIGS. 7A to 7E.

  The control signaling channel is a signal transmitted for each user scheduled in the packet scheduling unit 128, and a specific number of users who wish to perform scheduling in a cell have a required location rate and a required quality, for example, a predetermined quality. Must be able to be received with an error rate of. Accordingly, packet scheduling is not applied, and channels are allocated to the entire frequency band or at least a part of the frequency bands that are discretely arranged over the entire frequency band. By doing so, a frequency diversity effect can be obtained.

  For example, when radio resources are allocated to the control signaling channel, as shown in Configuration 1, the control signaling channel is allocated to at least one transmission slot, and all frequency bands are used in the allocated transmission slot. Is transmitted. By using the entire frequency band in this way, the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the control signaling channel, as shown in Configuration 2, the entire frequency band allocated to the system is divided into subcarrier blocks composed of a plurality of subcarriers, and at least one subcarrier is allocated. The control signaling channel is continuously mapped to the carrier block. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  In addition, when radio resources are allocated to the control signaling channel, as shown in Configuration 3, Configuration 1 and 2 are combined to map the control signaling channel to at least one subcarrier block of at least one transmission slot. . Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the control signaling channel, as shown in configuration 4, the control signaling channel is allocated to some symbols in at least one transmission slot, and all symbols are allocated in the allocated symbols. Transmission is performed using a frequency band. By using the entire frequency band in this way, the reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the control signaling channel, as shown in Configuration 5, the entire frequency band allocated to the system is divided into subcarrier blocks configured by a plurality of subcarriers, and at least one subcarrier is allocated. The control signaling channel is continuously mapped to some subcarriers in the carrier block. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  In addition, when radio resources are allocated to the control signaling channel, as shown in Configuration 6, a combination of Configurations 3 and 4, and a part of at least one subcarrier block of at least one transmission slot symbol The control signaling channel is mapped to the subcarriers. Thus, by performing mapping in the frequency direction, reception quality at the receiver can be improved due to the frequency diversity effect.

  Further, when radio resources are allocated to the control signaling channel, as shown in Configuration 7, the control signaling channel is mapped to some symbols of at least one subcarrier block of at least one transmission slot. In this case, in each transmission slot, the position of the mapped control signaling is arranged to be different in at least some of the subcarrier blocks. Thus, by mapping the control signaling channel in the frequency direction and the time axis direction, the reception quality at the receiver can be improved by the time diversity effect in addition to the frequency diversity effect. For example, when the receiver is moving at high speed, the reception quality at a certain frequency may drop at a certain moment. In such a case, by making the position of the control signaling channel mapped in each subcarrier block different in at least some of the subcarrier blocks, a time diversity effect can be obtained and reception quality is improved. be able to.

  Further, when radio resources are allocated to the control signaling channel, as shown in Configuration 8, the transmission slot described in Configuration 7 may be transmitted a predetermined number of times with a predetermined time interval. Thus, by transmitting the same transmission slot a plurality of times, the reception quality at the receiver can be improved by the time diversity effect in addition to the frequency diversity effect. In this case, the time interval for transmitting the transmission slot is adaptively controlled according to the environment. For example, the transmission interval is set to be long in an environment such as an office where there is little movement, and the transmission interval is set to be short in an environment such as in a city where movement is large. Further, the position of the common control channel mapped to a part of symbols of at least one subcarrier block of the transmission slot transmitted after the second time is set different from the position of the common control channel transmitted last time. Also good.

  Here, as shown in configuration example 9, the position of the control signaling channel in each subcarrier block described in configurations 7 and 8 is fixedly determined in advance based on a predetermined rule. Further, the position of the control signaling channel in each subcarrier block may be determined randomly in each subcarrier as shown in Configuration Example 10.

  Also, in the configuration example 8, as shown in FIG. 7E, the same information as the first time is transmitted in the control signaling channel transmitted from the second time onward. In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive a control signaling channel transmitted after the second time. If there is a demodulation error, the information is discarded, and the control signaling channel transmitted after the second time is demodulated again (no packet synthesis, Type-I).

  Further, when there is a demodulation error, the information is not discarded, and the control signaling channel transmitted after the second time and the control signaling channel received last time may be packet-combined and demodulated again (packet combining). Yes, Type-I). By doing so, the reception SIR can be improved.

  Moreover, in the structure 8, you may make it transmit the information different from the 1st time in the control signaling channel transmitted after the 2nd time. For example, the control signaling channel transmitted after the second time may be a packet punctured with a pattern different from the first time (with packet synthesis, Type-II). In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive the control signaling channel transmitted after the third time. If there is a demodulation error, the information may not be discarded, and the control signaling channel transmitted after the second time and the control signaling channel received last time may be combined and demodulated again. In this way, the coding gain can be improved.

  Moreover, in the structure 8, you may make it transmit the information different from the 1st time in the control signaling channel transmitted after the 2nd time. For example, information indicating the control signaling channel is divided into two or more and transmitted. When the control signaling channel transmitted for the first time stores information, and the control signaling channel transmitted for the second time or later has a redundant code stored therein, the control signaling channel transmitted for the first time is stored. Control signal channel transmitted after the second time cannot be decoded.

  In such a case, by dividing the information indicating the control signaling channel into two or more and transmitting it, the quality of the received product at the receiver can be improved due to the effect of time diversity. In this case, a transmission slot for dividing and transmitting information indicating the control signaling channel and a packet storing a redundant code may be transmitted.

  In this case, it is necessary to determine the number of divisions of the control signaling channel in advance between the transmitter and the receiver. As information to be determined in advance, a packet number for packet synthesis, a puncture pattern and a constellation, and a bit indicating a new or retransmitted packet are required. The bit indicating that it is a new or retransmitted packet is necessary in order to avoid incorrect combining in consideration of ACK / NACK bit errors.

  The case where radio resources are allocated to the common control channel and the control signaling channel has been described above.

  Next, a method for assigning radio resources to a plurality of common control channels and control signaling channels will be described.

  Here, a case where time multiplexing is applied, a case where frequency multiplexing is used together, and a case where code multiplexing is used together will be described separately.

  First, a case where time multiplexing is applied will be described.

  In this case, as shown in FIG. 8, the transmission apparatus receives control information from the common control channel signal generation unit 110 to which transmission data to be transmitted through the common control channel is input as channel # 1 and the packet scheduling unit 128 as channel # 2. The control signaling channel signal generation unit 120, the radio resource allocation unit 140, the IFFT unit 150, and the guard interval insertion unit 160 are input.

  The radio resource allocation unit 140 includes a switching unit 131 connected to the spreading units 106 and 116, and a switching control unit 132 and a serial / parallel conversion unit 133 connected to the switching unit 131. The serial / parallel converter 133 is connected to the IFFT unit 150.

  The switching control unit 132 performs control so as to switch the transmission channel for each symbol or transmission slot. The switching unit 131 switches a temporal transmission channel in accordance with a control signal from the switching control unit 132 and inputs the channel to the serial-parallel conversion unit 133.

  For example, as illustrated in FIG. 9A, the switching control unit 132 divides a time domain into a plurality of allocated frequency blocks, and a plurality of common control channels and physical channels of control signaling channels in the divided time domain. Switch to assign. For example, for each symbol included in the divided time domain, the switching control unit 132, for example, for each channel # 1, # 2, # 3,..., A plurality of physical channels of the common control channel and the control signaling channel Switch to assign.

  In this case, another physical channel, for example, a shared channel described later is assigned to a radio resource to which the common control channel and the control signaling channel are not assigned.

  In this way, by using at least one frequency block and assigning a plurality of common control channels and control signaling channels at the symbol level, reception quality can be improved due to the frequency diversity effect.

  Further, for example, as shown in FIG. 9B, the switching control unit 134 includes, for each transmission slot, a plurality of common control channels, control signaling channels, or both for a predetermined OFDM symbol of a frequency block included in the transmission slot. The plurality of physical channels may be switched so as to be assigned as channels # 1 and # 2, for example.

  In this case, another physical channel, for example, a shared channel described later is assigned to a radio resource to which the common control channel and the control signaling channel are not assigned. In this way, by assigning a plurality of common control channels, control signaling channels, or both, it is possible to transmit the common control channel and the control signaling channel using the entire band, and at the receiver due to the frequency diversity effect. Reception quality can be improved.

  Next, a case where frequency multiplexing is used together will be described. In this case, a transmission method when used in combination with time multiplexing when the number of physical channels that can be multiplexed with only time multiplexing described above is small will be described.

  The transmission apparatus used in combination with frequency multiplexing differs from the transmission apparatus described with reference to FIG. 8 in the configuration of the radio resource allocation unit 140. Radio resource allocation section 140 includes subcarrier mapping section 134 connected to spreading sections 106 and 116, and subcarrier mapping control section 135 connected to subcarrier mapping section 134. Subcarrier mapping section 134 is connected to IFFT section 150.

  Subcarrier mapping control section 135 determines subcarriers to which a plurality of common control channels and control signaling channels are mapped, and inputs the result to subcarrier mapping section 134. The subcarrier mapping unit 134 maps a plurality of common control channels and control signaling channels based on the input subcarrier information.

  For example, as shown in FIG. 11A, the subcarrier mapping control unit 135 divides the frequency band in the frequency block into a plurality of bands, and allocates a plurality of common control channels and control signaling channels for each of the divided bands. Further, the time domain of the frequency block may be divided into a plurality of times, and a plurality of common control channels and control signaling channels assigned to each divided time domain may be changed in a time division manner.

  For example, in the plurality of selected frequency blocks, the subcarrier mapping control unit 135 divides the frequency band in each frequency block into two, and when the transmission slot is divided into three, for example, channel # 1 for each divided block. , # 2, # 3,..., # 6 are assigned a plurality of common control channels, control signaling channels, or both.

  Thus, by using a plurality of frequency blocks and assigning a common control channel and a control signaling channel to each band obtained by dividing the frequency band in each frequency block, the reception quality at the receiver can be improved due to the frequency diversity effect. it can.

  Further, for example, as shown in FIG. 11B, the subcarrier mapping control unit 135 includes a plurality of common control channels, control signaling channels, or a predetermined OFDM symbol of a frequency block included in the transmission slot at the transmission slot level. Both of them may be assigned as channels # 1, # 2, # 3, and # 4, for example.

  For example, the subcarrier mapping control unit 135 assigns a plurality of common control channels, control signaling channels, or both to a predetermined OFDM symbol of the assigned frequency block. In this case, another physical channel, for example, a shared channel described later is assigned to a radio resource to which the common control channel and the control signaling channel are not assigned, and switching is performed in a time division manner.

  In this way, at the frequency block level, by assigning multiple common control channels, control signaling channels, or both, the common control channel and control signaling channel are transmitted using a discrete part across the entire band. The reception quality at the receiver can be improved by the frequency diversity effect.

  Next, a case where code multiplexing is used together will be described.

  The transmission apparatus in the case of using code multiplexing is different from the transmission apparatus described with reference to FIG. 8 in the configuration of the radio resource allocation unit 140. Radio resource allocation section 140 includes code multiplexing section 137 connected to spreading sections 106 and 116, and code multiplexing control section 136 connected to code multiplexing section 137. The code multiplexing unit 137 is connected to the IFFT unit 150.

  The code multiplexing control unit 136 performs control for code multiplexing the output signals of the spreading units 106 and 116 spread by different spreading codes. The code multiplexing unit 137 code-multiplexes the input channel.

  For example, as shown in FIG. 13, the code multiplexing control unit 136 transmits a plurality of common control channels, control signaling channels, or both to a predetermined OFDM symbol among the OFDM symbols included in the transmission slot at the transmission slot level. Are assigned as channels # 1 and # 2, for example, and code multiplexing is performed.

  In this case, another physical channel, for example, a shared channel to be described later is allocated to a radio resource to which the common control channel and the control signaling channel are not allocated.

  In this way, by using a plurality of frequency blocks and code-multiplexing the common control channel and the control signaling channel, it is possible to improve the reception quality due to the frequency diversity effect.

  Next, radio resource allocation to the shared channel will be described.

  Since the shared channel is information for each user, packet scheduling can be applied. The radio resource allocation unit 140 divides the entire frequency band allocated to the system in the frequency axis direction into one or a plurality of subcarriers, divides into one or a plurality of OFDM symbols in the time axis direction, and the code axis The direction is divided into one or a plurality of codes, a frequency block is configured by one or a plurality of subcarriers, a plurality of OFDM symbols, and a plurality of codes, and radio resources are allocated in units of the frequency block.

  Also, the radio resource allocation unit 140 performs time domain and frequency domain packet scheduling, and selects at least one frequency block from among a plurality of frequency blocks. Further, the result of packet scheduling is notified to the receiving station.

  The radio resource allocation unit 140 allocates an optimal frequency block based on feedback information from the receiving station, for example, a reception channel state, for example, a reception SIR.

  By doing in this way, the frequency block to allocate can be changed dynamically with respect to each user, and the frequency block with a good channel state can be allocated. For this reason, the receiving characteristic in a receiver can be improved according to a multiuser diversity effect.

  As an example, the case of eight users will be described with reference to FIG. That is, a case where each shared channel for 8 users is assigned to a radio resource will be described.

  The radio resource allocation unit 140 divides the entire frequency band allocated to the system into, for example, 8 to configure frequency blocks, and allocates radio resources according to the reception state of each user for each transmission slot.

  For example, the radio resource allocation unit 140 may allocate frequency blocks according to the data rate when the amount of information transmitted to each user is different. For example, frequency blocks are allocated according to a signal with a high data rate, for example a large file size download, and a low data rate, for example a low transmission rate such as voice. In this case, “the size of the packet to be transmitted” is larger than the size of the frequency block at a high data rate, and “the size of the packet to be transmitted” is the size of the frequency block at a low data rate. Smaller than this.

  A case where radio resources are allocated to a user with a high data rate will be described with reference to FIG.

  The radio resource allocation unit 140 allocates a plurality of frequency blocks (chunks) in the transmission slot because “the size of the packet to be transmitted” is larger than the size of the frequency block at a high data rate. For example, for a user # 1 having a high data rate, three frequency blocks are allocated in a certain transmission slot, and four frequency blocks are allocated in a certain transmission slot.

  Next, a case where radio resources are allocated to a user with a low data rate will be described with reference to FIG.

  Since the “size of packet to be transmitted” is smaller than the size of the frequency block in the case of a low data rate, the radio resource assignment unit 140 collectively assigns users with low data rates to one frequency block. A user with a low data rate cannot be satisfied with the information for transmitting one frequency block because the “size of packet to be transmitted” is smaller than the size of the frequency block. However, if only a part of the frequency block is used and transmission is performed with the rest empty, radio resources are wasted.

  Therefore, users with low data rates are collectively assigned to one frequency block. For example, the radio resource allocation unit 140 allocates users # 9 and # 10 having a low data rate to the same frequency block, and multiplexes and transmits them. By doing in this way, reception quality can be improved by the multiuser diversity effect.

  In addition, when allocating radio resources to a user with a low data rate, the radio resource allocation unit 140 may allocate the radio resources across at least two frequency blocks among a plurality of frequency blocks included in the same transmission slot. . When allocating users with low data rates to one frequency block at a time, a multi-user diversity effect may be deteriorated because a set of users with good reception conditions is not always allocated.

  In such a case, radio resources are allocated across a plurality of frequency blocks. For example, as shown in FIG. 17A, users # 9, # 10, # 11 and # 12 having a low data rate are spread over at least two frequency blocks among a plurality of frequency blocks included in the same transmission slot. assign. By doing in this way, a frequency diversity effect can be acquired and the reception quality in a receiver can be improved.

  Further, although FIG. 17A has been described by allocating radio resources to a shared channel for a user with a low data rate, a similar radio resource allocation method is a user with a high moving speed or a user with an extremely poor reception state. This is also effective when allocating to. This is because the channel fluctuation becomes very fast for a user with a fast moving speed, and radio resource allocation by packet scheduling cannot follow the fluctuation, and the improvement effect due to the multi-user diversity effect cannot be obtained. Also, for users with extremely poor reception conditions, it is a condition of a very low data rate. Therefore, it is not possible to obtain a sufficient channel coding gain just by allocating a part of a specific frequency block. It may deteriorate. As shown in FIG. 17B, the users having the above conditions are allocated across at least two frequency blocks among a plurality of frequency blocks included in the same transmission slot. By doing in this way, a frequency diversity effect can be acquired and the reception quality in a receiver can be improved.

  Next, a case where radio resources are allocated to the multicast channel will be described with reference to FIG. In the case of multicast, data is transmitted from a plurality of transmitters to a specific user.

  As shown in configuration example 1, when allocating radio resources to a multicast channel, the radio resource allocation unit 140 is configured to transmit the transmission slot in a transmission slot indicating a unit of transmission (TTI: Transmission Time Interval) in packet transmission. Are assigned to at least some symbols.

  Further, in this case, when allocating radio resources to physical channels other than multicast, the radio resource allocation unit 140 allocates symbols other than the symbols to which multicast channels are allocated. By doing so, since the multicast channel can be mapped over the entire frequency band, the reception quality at the receiver can be improved by the frequency diversity effect.

  Further, as shown in the configuration example 2, when the radio resource allocation unit 140 allocates radio resources to the multicast channel, the radio resource allocation unit 140 uses a transmission slot indicating a unit of transmission (TTI: Transmission Time Interval) in packet transmission. It may be assigned to at least a part of a plurality of symbols constituting a transmission slot and assigned to transmit the same transmission slot a plurality of times, for example, twice using a plurality of transmission slots.

  Further, in this case, when allocating radio resources to physical channels other than multicast, the radio resource allocation unit 140 allocates symbols other than the symbols to which multicast channels are allocated. By doing so, since the multicast channel can be mapped over the entire frequency band, the reception quality at the receiver can be improved by the frequency diversity effect. Furthermore, the effect of time diversity can also be obtained.

  In the configuration example 2, the same information as that of the first time is transmitted from the second time on the multicast channel. In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive a multicast channel transmitted after the second time. For example, a user located in the vicinity of the transmitter can often receive a single time. By controlling such a user so as not to receive a multicast channel transmitted for the second time or later, battery consumption can be suppressed.

  When there is a demodulation error, the information is discarded, and the multicast channel transmitted after the second time is demodulated again. Further, when there is a demodulation error, the information may not be discarded, and the multicast channel transmitted after the second time and the previously received multicast channel may be combined and demodulated again. By doing so, the reception SIR can be improved.

  Further, in the configuration example 2, the multicast channel transmitted for the second time or later may be transmitted with information different from the first time. For example, a multicast channel transmitted after the second time may be transmitted with a packet punctured with a pattern different from the first time. In this case, demodulation processing is performed on the receiver side, and it is determined whether there is a demodulation error. When there is no demodulation error, control is performed so as not to receive a multicast channel transmitted after the second time. For example, a user located in the vicinity of the transmitter can often receive a single time. By controlling such a user so as not to receive a multicast channel transmitted for the second time or later, battery consumption can be suppressed.

  If there is a demodulation error, the information may not be discarded, and the multicast channel transmitted after the second time and the previously received multicast channel may be combined and demodulated again. In this way, the coding gain can be improved.

  Further, in the configuration example 2, the multicast channel transmitted for the second time or later may be transmitted with information different from the first time. For example, information indicating a multicast channel is divided into two or more and transmitted. Information is stored in the multicast channel transmitted for the first time, and when the redundant code is stored for the multicast channel transmitted for the second time or later, the multicast channel transmitted for the first time is received. If it fails, the multicast channel transmitted from the second time onward cannot be decoded.

  In such a case, by dividing the information indicating the multicast channel into two or more and transmitting it, the received product quality at the receiver can be improved due to the effect of time diversity. In this case, a transmission slot for dividing and transmitting information indicating a multicast channel and a packet storing a redundant code may be transmitted.

  In this case, it is necessary to previously determine the number of divisions of the multicast channel between the transmitter and the receiver. As information to be determined in advance, a packet number for packet synthesis, a puncture pattern and a constellation, and a bit indicating a new or retransmitted packet are required. The bit indicating that it is a new or retransmitted packet is necessary in order to avoid incorrect combining in consideration of ACK / NACK bit errors.

  Next, a method for assigning radio resources for the shared channel in the frequency block will be described. The radio resource allocation unit 140 multiplexes the shared channel in the frequency block to which the radio resource is allocated.

  First, a method for allocating radio resources to users with a high data rate will be described.

  For example, the radio resource allocation unit 140 multiplexes a signal of one user in a frequency block based on the result of frequency / time scheduling for a user with a high data rate. For example, as shown in FIG. 19, the radio resource allocation unit 140 combines time multiplexing and frequency multiplexing and multiplexes signals for one user.

  Next, a method for assigning radio resources to users with low data rates will be described with reference to FIG.

  For example, the radio resource allocating unit 140 time-multiplexes signals of a plurality of users in a frequency block based on the result of frequency / time scheduling for a user with a low data rate. By doing so, the reception quality can be improved by the frequency diversity effect.

  Further, for example, the radio resource allocation unit 140 may frequency multiplex signals of a plurality of users in a frequency block based on the result of frequency / time scheduling for a user with a low data rate. By doing in this way, reception quality can be improved by the time diversity effect.

  Further, for example, the radio resource allocation unit 140 may code-multiplex signals of a plurality of users in a frequency block based on the result of frequency / time scheduling for a user with a low data rate. By doing in this way, a time diversity effect and a frequency diversity effect can be acquired compared with time multiplexing and frequency multiplexing, and the reception quality in a receiver can be improved. Further, by applying a low-speed data modulation scheme such as QPSK or BPSK, it is possible to reduce the influence of inter-code interference caused by the loss of orthogonality.

  In addition, for example, the radio resource allocation unit 140 combines time multiplexing, frequency multiplexing, and code multiplexing of a plurality of user signals in a frequency block based on the result of frequency / time scheduling for a user with a low data rate. May be multiplexed.

  This will be specifically described.

  As described above, the radio resource allocation unit 140 time-multiplexes the signals of a plurality of users in the frequency block as shown in FIG. By doing so, reception quality can be improved by the frequency diversity effect, particularly in an environment where there are many users of low-speed mobility.

  On the other hand, as shown in FIG. 22A, the radio resource allocation unit 140 multiplexes signals of a plurality of users in the frequency block by combining time multiplexing and frequency multiplexing as shown in FIG. 22A.

  Further, as shown in FIG. 22B, the radio resource allocation unit 140 may multiplex signals of a plurality of users in the frequency block by combining time multiplexing and code multiplexing, as shown in FIG. 22B. Good.

  Further, the radio resource allocation unit 140 may further multiplex signals of a plurality of users in the frequency block by combining time multiplexing, frequency multiplexing, and code multiplexing for a user with a low data rate.

  For example, as shown in FIGS. 23A and 23B, the radio resource allocation unit 140 multiplexes signals of a plurality of users in the frequency block in the time domain / frequency domain. FIG. 23A shows a case where continuous time areas are assigned, and FIG. 23B shows a case where jump time areas are assigned.

  Further, for example, as shown in FIG. 24, the radio resource allocation unit 140 selects a block composed of subcarriers and OFDM symbols randomly in the time domain / frequency domain, and signals of a plurality of users in the frequency block. You may make it multiplex.

  Further, for example, the radio resource allocation unit 140 may multiplex signals of a plurality of users in the frequency block in the time domain / code domain as illustrated in FIGS. 25A and 25B. FIG. 25A shows a case where a continuous frequency region is assigned, and FIG. 25B shows a case where a skipped frequency region is assigned.

  Further, for example, the radio resource allocation unit 140 may multiplex signals of a plurality of users in the frequency block in the frequency domain / code domain as shown in FIGS. 26A and 26B. FIG. 26A shows a case where continuous time regions are assigned, and FIG. 26B shows a case where skipped time regions are assigned.

  Further, for example, the radio resource allocation unit 140 may multiplex signals of a plurality of users in the frequency block in the time domain / frequency domain / code domain as shown in FIGS. 27A and 27B. FIG. 27A shows a case where a continuous frequency region is assigned, and FIG. 27B shows a case where a skipped frequency region is assigned.

  As described above, the time domain, the frequency domain, and the code domain in the frequency block are divided, and a user signal is allocated to each of the divided areas, so that multiplexing among a plurality of users in the frequency block can be performed.

  Next, the operation of the transmission apparatus 100 according to the present invention will be described with reference to FIG.

  Information to be transmitted on the common control channel is input to channel coding section 102. Channel coding section 102 performs channel coding on the input information according to a preset channel coding rate (step S2702).

  Next, data modulation section 104 performs data modulation on the information subjected to channel coding in accordance with a preset data modulation scheme (step S2704).

  Next, spreading section 106 spreads the data-modulated information according to a preset spreading factor (step S2706).

  On the other hand, the packet scheduling unit 128 selects the user based on the input transmission information to each user and the reception quality of each user, and the data modulation scheme and coding rate used for each selected user. A determination is made (step S2708).

  Next, channel coding section 122 performs channel coding on information to be transmitted to each user according to the coding rate determined by packet scheduling section 128 (step S2710).

  Next, data modulation section 104 performs data modulation on information to be transmitted to each channel-encoded user according to the data modulation scheme determined by packet scheduling section 128 (step S2712).

  Next, spreading section 106 spreads information to be transmitted to each user whose data has been modulated in accordance with the spreading factor determined by packet scheduling section 128 (step S2714).

  Further, the packet scheduling unit 128 inputs information on the selected user, information on the selected data modulation scheme and coding rate, etc., to the channel coding unit 112.

  Channel coding section 112 performs channel coding on the input information according to a preset channel coding rate (step S2716).

  Next, the data modulation section 104 performs data modulation on the information subjected to channel coding in accordance with a preset data modulation scheme (step S2718).

  Next, the spreading unit 106 spreads the data-modulated information according to a preset spreading factor (step S2720).

  Next, the radio resource allocation unit 140, based on the channel type, data rate, mobility, etc., information to be transmitted on the common control channel, information on the selected user, information such as the selected data modulation scheme and coding rate, And the information transmitted to each user is allocated to a radio | wireless resource (step S2722).

  Next, an OFDM signal is generated (step S2724) and transmitted.

  The following items are further disclosed regarding the embodiment including the above examples.

(1) In a transmitting apparatus that transmits a plurality of subcarriers:
Radio resource allocation means for allocating radio resources to each physical channel in accordance with the type of physical channel;
Transmitting means for transmitting information to be transmitted in each physical channel by the allocated radio resource;
A transmission device comprising:

(2) In the transmission device according to (1):
Scheduling means for selecting a user to be transmitted based on information indicating reception quality from each user;
A transmission device comprising:

(3) In the transmission device according to (1) or (2):
The radio resource allocation means includes a plurality of subcarrier blocks obtained by dividing all frequency bands allocated to the own system for at least one of a common control channel and a channel for transmitting control information indicating a selected user. A transmission apparatus that allocates at least one subcarrier block.

(4) In the transmission device according to (1) or (2):
The radio resource allocating means includes a plurality of subcarriers and a plurality of subcarriers obtained by dividing all frequency bands allocated to the own system for at least one of a common control channel and a channel for transmitting control information indicating a selected user. A transmission apparatus that allocates radio resources based on a frequency block composed of symbols.

(5) In the transmission device according to (4):
The radio resource allocating unit allocates at least a part of a plurality of symbols constituting the frequency block to at least one of a common control channel and a channel for transmitting the control information. Transmitter device.

(6) In the transmission device according to (5):
The radio resource allocating unit allocates a predetermined symbol of a frequency block included in a transmission slot to at least one of a common control channel and a channel that transmits control information indicating a selected user. apparatus.

(7) In the transmission device according to (6):
The radio resource allocating means allocates a position of a predetermined symbol of a frequency block included in a transmission slot to at least a part of at least one of a common control channel and a channel that transmits control information indicating a selected user. A transmission apparatus characterized by allocating differently in subcarrier blocks.

(8) In the transmission device according to (7):
The radio resource allocating unit allocates a channel for transmitting the control information to a plurality of transmission slots.

(9) In the transmission device according to (8):
The radio resource allocating unit allocates a channel for transmitting the control information to a symbol position different from the previously transmitted transmission slot.

(10) In the transmission device according to (8) or (9):
The radio apparatus according to claim 1, wherein the radio resource allocating unit allocates a channel for transmitting the divided control information to a plurality of transmission slots.

(11) In the transmission device according to (1) or (2):
The radio resource allocating means allocates a predetermined symbol in a transmission slot to a multicast channel.

(12) In the transmission device according to (11):
The radio resource allocating unit allocates a channel for the multicast channel to a plurality of transmission slots.

(13) In the transmission device according to (12):
The radio resource allocating means allocates a channel for transmitting the multicast to a symbol position different from the previously transmitted transmission slot.

(14) In the transmission device according to (12) or (13):
The transmission apparatus characterized in that the radio resource allocation means allocates a channel for transmitting data transmitted by the divided multicast to a plurality of transmission slots.

(15) In the transmission device according to (2):
The scheduling means performs packet scheduling in the time domain and the frequency domain, and at least one of frequency blocks constituted by a plurality of subcarriers and a plurality of symbols obtained by dividing all frequency bands allocated to the own system, A transmission apparatus that determines a frequency block to be allocated to a shared channel.

(16) In the transmission device according to (2):
The scheduling apparatus determines a radio parameter to be used for transmission to a selected user.

(17) In the transmission device according to (15) or (16):
The radio resource allocating unit divides a signal to be transmitted to a plurality of users in the frequency block, and divides the entire frequency band allocated to the system for one or a plurality of subcarriers in the frequency axis direction. Is divided into one or a plurality of symbols, the code axis direction is divided into one or a plurality of codes, and based on a frequency block composed of one or a plurality of subcarriers, a plurality of symbols, and a plurality of codes. A transmission apparatus characterized by allocating radio resources.

(18) In the transmission device according to any one of (15) to (17):
The radio resource allocating unit allocates a frequency block based on at least one of a data rate and mobility.

(19) In the transmission device according to (16):
The radio resource allocating unit allocates a plurality of frequency blocks included in a transmission slot based on the data rate.

(20) In the transmission device according to (18) or (19):
The radio resource allocating unit allocates a signal to be transmitted to a plurality of users to one frequency block based on the data rate.

(21) In the transmission device according to (20):
The radio resource allocating means allocates to a plurality of frequency blocks included in a transmission slot.

(22) In a radio resource allocation method in a transmission apparatus that transmits a plurality of subcarriers:
Receiving information indicating reception quality;
Determining a user to send based on the received quality;
Assigning radio resources to each physical channel according to the type of physical channel;
Transmitting information to be transmitted on each physical channel to the transmitting user by the allocated radio resource;
A radio resource allocation method characterized by comprising:

(23) In the radio resource allocation method according to (22):
The step of allocating the radio resource includes, among at least one of a common control channel and a channel for transmitting control information indicating a selected user, among subcarrier blocks obtained by dividing all frequency bands allocated to the own system. Assigning at least one subcarrier block;
A radio resource allocation method characterized by comprising:

(24) In the radio resource allocation method according to (23):
The step of allocating radio resources includes a plurality of subcarriers and a plurality of subcarriers obtained by dividing all frequency bands allocated to the own system for at least one of a common control channel and a channel for transmitting control information indicating a selected user. Allocating radio resources based on a frequency block composed of
A radio resource allocation method characterized by comprising:

(25) In the radio resource allocation method according to (23):
The step of allocating the radio resource includes at least one position of a predetermined symbol of the frequency block included in a transmission slot with respect to at least one of a common control channel and a channel that transmits control information indicating the selected user. Assigning differently in some subcarrier blocks;
A radio resource allocation method characterized by comprising:

(26) In the radio resource allocation method according to (25):
Allocating the radio resource includes allocating a channel for transmitting the control information to a plurality of transmission slots;
A radio resource allocation method characterized by comprising:

(27) In the radio resource allocation method according to (22) to (26):
Performing packet scheduling in the time domain and the frequency domain;
A step of determining a frequency block to be allocated to a shared channel among frequency blocks composed of a plurality of subcarriers and a plurality of symbols obtained by dividing the entire frequency band allocated to the own system based on the packet scheduling. ;
A radio resource allocation method characterized by comprising:

(28) In the radio resource allocation method according to (27):
The step of allocating the radio resource divides a signal to be transmitted to a plurality of users in the frequency block, divides the entire frequency band allocated to the system for one or a plurality of subcarriers in the frequency axis direction, The direction is divided into one or a plurality of symbols, the code axis direction is divided into one or a plurality of codes, and based on a frequency block composed of one or a plurality of subcarriers, a plurality of symbols, and a plurality of codes. And allocating a radio resource.

(29) In the radio resource allocation method according to (22) to (28):
Assigning a predetermined symbol in a transmission slot to a multicast channel;
A radio resource allocation method characterized by comprising:

  The transmission apparatus and radio resource allocation method according to the present invention can be applied to a mobile communication system.

100 Transmitter

Claims (8)

A frequency block is formed by a plurality of subcarriers in the frequency axis direction and a plurality of OFDM symbols in the time axis direction, the length of the frequency block in the time axis direction corresponds to a transmission slot, and the frequency block has a frequency over the system frequency band. A first allocating unit that is arranged in a plurality in the axial direction and allocates a plurality of control signaling channels to the first OFDM symbol in the frequency block;
A second allocating unit that allocates a shared channel to a part of the frequency block that is different from the OFDM symbol to which the control signaling channel is allocated;
The transmission apparatus according to claim 1, wherein the first allocation unit code-multiplexes a plurality of control signaling channels.   The transmission apparatus according to claim 1, wherein the second allocation unit allocates a shared channel based on information indicating reception quality from each user.   The transmission apparatus according to claim 2, wherein the second allocating unit determines a radio parameter used for transmission to the selected user.   The transmission apparatus according to claim 1, wherein the second assignment unit performs assignment based on at least one of a data rate and mobility. A frequency block is formed by a plurality of subcarriers in the frequency axis direction and a plurality of OFDM symbols in the time axis direction, the length of the frequency block in the time axis direction corresponds to a transmission slot, and the frequency block has a frequency over the system frequency band. Assigning a plurality of control signaling channels to the OFDM symbol of the head portion in the frequency block, a plurality of which are arranged in the axial direction;
Allocating a shared channel to a part of the frequency block different from the OFDM symbol to which the control signaling channel is allocated, and
The assigning method characterized in that the step of assigning the control signaling channel includes code-multiplexing a plurality of control signaling channels.   6. The allocation method according to claim 5, wherein the step of allocating the shared channel allocates a shared channel based on information indicating reception quality from each user.   The method according to claim 6, wherein the step of allocating the shared channel determines a radio parameter used for transmission to the selected user.   6. The allocation method according to claim 5, wherein the step of allocating the shared channel performs the allocation based on at least one of a data rate and mobility.

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