JP5198367B2 - Transmission device, transmission method, user device, and communication method - Google Patents

Description

  The present invention relates to a transmission device and a transmission method.

  As a transmission method in the downlink data channel, there are a localized type transmission and a distributed type transmission.

  In localized transmission, as shown in FIG. 1A, each user is assigned a frequency block as a unit. For example, in localized transmission, a frequency block with good frequency selective fading is allocated. Localized transmission is generally a transmission method that has a large transmission data size and is effective when a frequency scheduling effect is aimed.

  In distributed transmission, as shown in FIG. 1B, data is transmitted by being distributed over the entire allocated band regardless of frequency blocks. For example, distributed transmission is used when frequency scheduling is not possible during high-speed movement or when transmission data is small, such as VoIP. Distributed transmission is generally a transmission method that has a small transmission data size and is advantageous when a frequency diversity effect is aimed at.

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

  One system needs to support communication from low speed movement to high speed movement.

  Further, it is necessary to support a single system from a packet such as Web browsing having a large data size to a packet such as VoIP having a small data size.

  Therefore, the present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a transmission apparatus and a transmission method that can support localized transmission and distributed transmission in one system.

In order to solve the above problems, the transmission device of the present invention provides:
The system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, and a frequency scheduling unit that selects a frequency block to be allocated to a downlink channel;
A mapping unit that maps downlink channel data to the frequency block selected in the frequency scheduling unit, and
In addition to distributed transmission, the frequency scheduling unit sequentially selects frequency blocks according to a predetermined pattern for distributing frequency blocks in a system band at fixed intervals as time elapses. Localized transmission for selecting a certain frequency block is also defined, and one of them is used, and in the distributed transmission and the localized transmission, the frequency block is a common unit,
The Distributed type transmission and the Localized type transmission are switched in units of a predetermined period.

The transmission method of the present invention includes:
A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, and a step of selecting a frequency block to be allocated to a downlink channel;
Mapping downlink channel data to selected frequency blocks, and
In addition to the distributed transmission in which the selecting step sequentially selects the frequency blocks according to a predetermined pattern for the frequency blocks being distributed and arranged at fixed intervals in the system band as time elapses. Localized transmission for selecting a certain frequency block is also defined, and one of them is used, and in the distributed transmission and the localized transmission, the frequency block is a common unit,
The Distributed type transmission and the Localized type transmission are switched in units of a predetermined period.

This user device
A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, a frequency block to be allocated to a downlink channel is selected, and a downlink mapped to the selected frequency block A reception department that accepts data for
A processing unit for processing the data received in the reception unit,
In the data received by the reception unit, according to the passage of time, distributed transmission for sequentially selecting frequency blocks according to a predetermined pattern for distributing and arranging frequency blocks in the system band, and constant transmission Localized transmission for selecting a frequency block is defined, and one of them is used. In the Distributed transmission and the Localized transmission, the frequency block is a common unit .
The user equipment characterized in that the distributed transmission and the localized transmission are switched in units of a predetermined period .

This communication method is
A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, a frequency block to be allocated to a downlink channel is selected, and a downlink mapped to the selected frequency block Accepting data for the channels of
And a step of processing the received data,
In the data received in the step of receiving, according to the passage of time, distributed transmission that sequentially selects frequency blocks according to a predetermined pattern for frequency blocks being distributed and arranged in the system band, and constant transmission Localized transmission for selecting a frequency block is defined, and one of them is used. In the Distributed transmission and the Localized transmission, the frequency block is a common unit .
The communication method characterized in that the Distributed type transmission and the Localized type transmission are switched in units of a predetermined period .

  With this configuration, localized transmission and distributed transmission can be supported in one system.

  According to the embodiments of the present invention, it is possible to realize a transmission apparatus and a transmission method that can support localized transmission and distributed transmission in one system.

It is explanatory drawing which shows Localized transmission. It is explanatory drawing which shows Distributed type transmission. It is a partial block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the transmitter concerning one Example of this invention. It is a partial block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the transmitter concerning one Example of this invention. It is a partial block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the transmitter concerning one Example of this invention. It is a partial block diagram which shows the transmitter concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the transmitter concerning one Example of this invention.

Next, the best mode for carrying out the present invention will be described based on the following embodiments 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 transmission apparatus according to a first embodiment of the present invention will be described with reference to FIG.

  The transmission apparatus 100 according to the present embodiment switches between localized type transmission and distributed type transmission in a time division manner. For example, the transmission device 100 performs switching between localized transmission and distributed transmission for each subframe.

  The transmission apparatus 100 is connected to the frequency scheduling unit 102, the distribution pattern assignment unit 104, the mapping unit 110, and the mapping unit 110, a switch 106 that switches between the frequency scheduling unit 102 and the distribution pattern assignment unit 104, And a control unit 108 that performs control.

  The frequency scheduling unit 102 assigns frequency blocks to each user at the time of performing localized transmission. For example, the frequency scheduling unit 102 assigns a frequency block to each user based on, for example, frequency selective fading. Here, the frequency block refers to a unit obtained by dividing the system bandwidth into blocks of continuous frequency subcarriers.

  The distribution pattern assignment unit 104 assigns subcarriers to each user at the time of performing distributed transmission. For example, the distributed pattern assignment unit 104 uses the distributed frequency block made up of frequency subcarriers discretely distributed within the system bandwidth as a unit and distributes it over the entire assigned band and assigns it to each user. For example, the distributed frequency block includes divided subframes obtained by dividing one or a plurality of subcarriers and subframes.

  For example, with the distributed frequency block as an allocation unit, the position at which the distributed frequency block is arranged in the time for performing the distributed transmission is determined in advance as a distributed pattern. The distributed pattern assignment unit 104 arranges distributed frequency blocks based on the distributed pattern.

  Also, a plurality of distributed patterns are prepared in advance, and the distributed pattern assignment unit 104 selects one of the plurality of distributed patterns based on a predetermined condition, and arranges the distributed frequency block based on the selected distributed pattern. You may make it do.

  The switch 106 switches between Localized transmission and Distributed transmission.

  The control unit 108 controls the switch 106. For example, the control unit 108 controls the switch for a predetermined time, for example, in units of subframes. As a result, Localized transmission and Distributed transmission are switched in units of subframes. For example, the control unit 108 controls the switch 106 so that the switch 106 is switched at a fixed rate, for example, the localized type transmission and the distributed type transmission are switched at a ratio of 3 to 1.

  Further, the control unit 108 may control the switch 106 so that the Localized transmission and the Distributed transmission are switched according to the traffic ratio.

  The mapping unit 110 assigns data to frequency blocks in a time domain where localized transmission is performed, for example, in a subframe. In addition, the mapping unit 110 assigns data based on the input distributed pattern in the time domain in which distributed transmission is performed, for example, in a subframe.

  As a result, as shown in FIG. 3, Localized transmission and Distributed transmission are performed in time, for example, in units of subframes.

  By doing in this way, the frequency diversity effect can be obtained to the maximum in both localized type transmission and distributed type transmission.

  Next, a transmitting apparatus according to the second embodiment of the present invention will be described with reference to FIG.

  The transmission apparatus 100 according to the present embodiment switches between Localized transmission and Distributed transmission on a frequency block basis. For example, the transmission apparatus 100 assigns users who perform localized transmission and distributed transmission in units of frequency blocks and distributed frequency blocks.

  The transmission apparatus 100 includes a frequency scheduling unit 102, a distributed pattern assignment unit 104 and a mapping unit 110 connected to the frequency scheduling unit 102. The distributed pattern assignment unit 104 is connected to the mapping unit 110.

  The frequency scheduling unit 102 assigns frequency blocks to each user. For example, the frequency scheduling unit 102 assigns frequency blocks to each user based on frequency selective fading. Further, the frequency scheduling unit 102 inputs information indicating the allocated frequency block to the distributed pattern allocation unit 104 and the mapping unit 110.

  Based on the information indicating the frequency block input by the frequency scheduling unit 102, the distribution pattern allocation unit 104 distributes the distributed frequency block to all frequency blocks other than the frequency block allocated to the user in the frequency scheduling unit 102. Deploy.

  For example, using the distributed frequency block as an allocation unit, the position where the distributed frequency block is arranged in the frequency block is determined in advance as a distributed pattern. Based on the distributed pattern, the distributed pattern assignment unit 104 arranges distributed frequency blocks in frequency blocks other than the frequency blocks assigned by the frequency scheduling unit 102 and assigns each user.

  Also, a plurality of distributed patterns are prepared in advance, and the distributed pattern assignment unit 104 selects one of the plurality of distributed patterns based on a predetermined condition, and arranges the distributed frequency block based on the selected distributed pattern. Each user may be assigned.

  The mapping unit 110 assigns data to a frequency block to which a user performing localized transmission is assigned. Also, the mapping unit 110 assigns data to distributed frequency blocks arranged in frequency blocks other than the frequency block to which a user performing localized transmission is assigned.

  As a result, as shown in FIG. 5, the data for Localized transmission and the data for Distributed transmission are divided and transmitted in frequency block units.

  By doing in this way, the bad influence on the scheduling effect in Localized type transmission can be reduced compared with the case where Localized type transmission and Distributed type transmission are switched by time division.

  Moreover, since all subframes are used, flexibility in the time direction can be improved. For example, when switching between Localized type transmission and Distributed type transmission by time division, retransmission of Localized type transmission can be performed only for time of performing Localized type transmission, and retransmission of Distributed type transmission is time for performing Distributed type transmission. I can only do it. In the transmission apparatus 100 according to the present embodiment, it is possible to reduce time constraints in such retransmission control.

  Next, a transmission apparatus according to a third embodiment of the present invention is described with reference to FIG.

  The transmission apparatus 100 according to the present embodiment transmits Localized transmission and Distributed transmission in the same time, for example, in the same subframe.

  The transmission apparatus 100 includes a frequency scheduling unit 102, a distribution pattern assignment unit 104, and a mapping unit 110 connected to the frequency scheduling unit 102 and the distribution pattern assignment unit 104.

  The frequency scheduling unit 102 assigns frequency blocks to each user. For example, the frequency scheduling unit 102 assigns a frequency block to each user based on, for example, frequency selective fading.

  The distributed pattern assignment unit 104 assigns distributed frequency blocks to each user. For example, the distribution pattern allocation unit 104 distributes the entire allocation band in units of distributed frequency blocks and allocates them to each user.

  For example, the distributed pattern assignment unit 104 makes a hole in a frequency block that performs localized transmission. That is, a resource for performing distributed transmission is secured or punctured in advance, and data for performing distributed transmission is embedded.

  In this case, the position where the distributed frequency block is arranged is determined in advance as a distributed pattern using the distributed frequency block as an allocation unit. The distributed pattern assignment unit 104 arranges distributed frequency blocks based on the distributed pattern and assigns them to each user.

  Also, a plurality of distributed patterns are prepared in advance, and the distributed pattern assignment unit 104 selects one of the plurality of distributed patterns based on a predetermined condition, and arranges the distributed frequency block based on the selected distributed pattern. However, it may be assigned to each user.

  The mapping unit 110 assigns data to the frequency block and the distributed frequency block. In this case, data for performing localized transmission is allocated based on information indicating a frequency block. The mapping unit 110 assigns data based on the input distributed pattern. Therefore, even in a frequency block to which data for performing localized transmission is allocated, data for performing localized transmission is not allocated in a distributed frequency block to which data for distributed transmission is allocated.

  As a result, as shown in FIG. 7, the data for Localized transmission and the data for Distributed transmission are coexisted and transmitted at the same time.

  By doing in this way, the frequency diversity effect can be acquired also with the data which performs Localized transmission, and the data which performs Distributed transmission.

  Next, a transmission apparatus according to a fourth embodiment of the present invention is described with reference to FIG.

  The transmission apparatus 100 according to the present embodiment performs Distributed transmission in the category of Localized transmission.

  The transmission apparatus 100 includes a frequency scheduling unit 102 and a mapping unit 110 that is connected to the frequency scheduling unit 102, receives transmission data, and outputs transmission data.

  The frequency scheduling unit 102 assigns frequency blocks to a user who performs localized transmission. For example, the frequency scheduling unit 102 allocates a frequency block to a user who performs localized transmission based on frequency selective fading, for example, and inputs information indicating the allocated frequency block to the mapping unit 110.

  The frequency scheduling unit 102 also assigns frequency blocks to users who perform distributed transmission. For example, the frequency scheduling unit 102 allocates a frequency block to a user who performs Distributed transmission, and inputs information indicating the allocated frequency block to the mapping unit 110. For example, the frequency scheduling unit 102 selects a frequency block to be assigned to each user in units of distributed frequency blocks.

  In addition, with the distributed frequency block as an allocation unit, a position where the distributed frequency block is arranged in the frequency block is determined in advance as a distributed pattern. The distributed pattern assignment unit 104 assigns a distributed frequency block to each user based on the distributed pattern.

  Also, a plurality of distributed patterns are prepared in advance, and the frequency scheduling unit 102 selects one of the plurality of distributed patterns based on a predetermined condition, and distributes a distributed frequency block to each user based on the selected distributed pattern. May be assigned.

  The mapping unit 110 assigns data to a frequency block that performs localized transmission. Also, the mapping unit 110 assigns data to distributed frequency blocks arranged in frequency blocks that perform distributed transmission.

  As a result, as shown in FIG. 9, data for Localized transmission and data for Distributed transmission are transmitted using frequency blocks as allocation units.

  By doing so, it is possible to eliminate the signaling information necessary when performing distributed transmission.

  The transmitter and the transmission method according to the present invention can be applied to a radio communication system.

100 Transmitter

Claims (4)

The system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, and a frequency scheduling unit that selects a frequency block to be allocated to a downlink channel;
A mapping unit that maps downlink channel data to the frequency block selected in the frequency scheduling unit, and
In addition to distributed transmission, the frequency scheduling unit sequentially selects frequency blocks according to a predetermined pattern for distributing frequency blocks in a system band at fixed intervals as time elapses. Localized transmission for selecting a certain frequency block is also defined, and one of them is used, and in the distributed transmission and the localized transmission, the frequency block is a common unit,
A transmission apparatus characterized in that the distributed transmission and the localized transmission can be switched in units of a predetermined period . A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, and a step of selecting a frequency block to be allocated to a downlink channel;
Mapping downlink channel data to selected frequency blocks, and
In addition to the distributed transmission in which the selecting step sequentially selects the frequency blocks according to a predetermined pattern for the frequency blocks being distributed and arranged at fixed intervals in the system band as time elapses. Localized transmission for selecting a certain frequency block is also defined, and one of them is used, and in the distributed transmission and the localized transmission, the frequency block is a common unit,
The transmission method characterized in that the distributed transmission and the localized transmission are switched in units of a predetermined period . A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, a frequency block to be allocated to a downlink channel is selected, and a downlink mapped to the selected frequency block A reception department that accepts data for
A processing unit for processing the data received in the reception unit,
In the data received by the reception unit, according to the passage of time, distributed transmission for sequentially selecting frequency blocks according to a predetermined pattern for distributing and arranging frequency blocks in the system band, and constant transmission Localized transmission for selecting a frequency block is defined, and one of them is used. In the Distributed transmission and the Localized transmission, the frequency block is a common unit .
The user equipment characterized in that the distributed transmission and the localized transmission are switched in units of a predetermined period . A system band is divided into a plurality of frequency blocks formed by a plurality of continuous frequency subcarriers, a frequency block to be allocated to a downlink channel is selected, and a downlink mapped to the selected frequency block Accepting data for the channels of
And a step of processing the received data,
In the data received in the step of receiving, according to the passage of time, distributed transmission that sequentially selects frequency blocks according to a predetermined pattern for frequency blocks being distributed and arranged in the system band, and constant transmission Localized transmission for selecting a frequency block is defined, and one of them is used. In the Distributed transmission and the Localized transmission, the frequency block is a common unit .
The communication method characterized in that the Distributed type transmission and the Localized type transmission are switched in units of a predetermined period .

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