WO2010087334A1

WO2010087334A1 - Base station apparatus, terminal apparatus, wireless communication system including those apparatuses, and programs to be executed by base station apparatus and terminal apparatus

Info

Publication number: WO2010087334A1
Application number: PCT/JP2010/050969
Authority: WO
Inventors: 平川功; 梁永明
Original assignee: シャープ株式会社
Priority date: 2009-01-28
Filing date: 2010-01-26
Publication date: 2010-08-05

Abstract

A wireless communication system wherein a plurality of frequency bands are used for performing communications. A plurality of terminal apparatuses used in the wireless communication system are classified into a plurality of groups, while a plurality of combinations of frequency bands are established from the plurality of frequency bands used in the wireless communication system. In the wireless communication system, a base station apparatus allocates the plurality of combinations of frequency bands to the plurality of groups of terminal apparatuses. When a wider frequency band is used for performing communications, not only a combination of frequency bands having a higher priority but also a combination of frequency bands having a lower priority are used and the communication processes in the respective combinations of frequency bands are performed independently of each other. In this way, when a plurality of frequency bands are used for performing wireless communications, the constraints can be reduced which occur due to the complications of scheduling, resource allocations, configurations and the like caused by the differences in the elemental frequency bands used by the respective terminal apparatuses.

Description

BASE STATION DEVICE, TERMINAL DEVICE, RADIO COMMUNICATION SYSTEM INCLUDING THE SAME, BASE STATION DEVICE, AND TERMINAL DEVICE RUNNING PROGRAM

The present invention relates to a communication technology using a wireless communication technology, and more particularly, to a base station device and a terminal device that perform communication using a plurality of frequency bands, and a wireless communication system including them.

Currently evolved third generation radio access (Evolved Universal Terrestrial Radio Access, hereinafter referred to as “EUTRA”) and evolved third generation radio access network (hereinafter referred to as Evolved Universal Terrestrial Radio Access, hereinafter referred to as “Evolved Universal Radio Access,” hereinafter referred to as “Evolved Universal Radio Access,” hereinafter referred to as “Evolved Universal Terrestrial Radio Access”). ) Is being considered. These specifications are called Long Term Evolution (hereinafter referred to as “LTE”). As the downlink of EUTRA, an OFDMA (Orthogonal Frequency Division Multiplexing Access) method has been proposed (see Non-Patent Document 1 below).

Further, as a next generation EUTRA and EUTRAN, an advanced long term evolution (LTE-Advanced) has been proposed (see Non-Patent Document 2 below). In addition, as a band expansion technique for improving the transmission rate used for this, it has been proposed to combine and use a plurality of frequency bands (see Non-Patent

Documents

3 and 4 below).

The following is a brief explanation of the contents of the above technology.

1) Description of EUTRA Channel Configuration FIG. 15 is a diagram illustrating a channel configuration example in EUTRA. The downlink of EUTRA (communication from the base station apparatus BS to the terminal apparatus MS) includes a downlink control area designation channel (PCFICH: Physical Control Indicator Channel) and a downlink complex retransmission request channel (PHICH: Physical Hybrid ARQ Indicator). ), A downlink multicast channel (PMCH: Physical Multicast Channel), a downlink shared channel (PDSCH: Physical Downlink Shared Channel), and a downlink control channel (PDCCH: Physical Downlink Control Channel, Downlink Channel Channel). oradcast Channel), and is made of. In addition, a synchronization signal (SCH) that is a reference signal for the terminal device to synchronize with the base station, and a reference signal (RS: Reference Signal) used as a reference when measuring signal quality or demodulating the received signal are also provided. Sent.

In addition, the uplink of EUTRA (communication from the terminal apparatus MS to the base station apparatus BS) includes a random access channel (RACH: Random Access Channel), an uplink shared channel (PUSCH), an uplink shared channel, and an uplink control channel ( PUCCH: Physical Uplink Control Channel). In addition, a reference signal (RS: Reference Signal) used as a standard for signal quality measurement and reception signal demodulation is also transmitted. (For example, see Non-Patent Document 1 below).

FIG. 16 is a schematic diagram showing a configuration example of a downlink signal frame of EUTRA. The horizontal axis is the frequency axis, and the vertical axis is the time axis. An EUTRA downlink signal frame is based on a resource block including a plurality of subcarriers in the frequency direction and a plurality of OFDM symbols in the time direction, and includes a plurality of resource blocks. The first 1 to 4 OFDM symbols of each resource block are used as a downlink control region. PCFICH, PHICH, and PDCCH are arranged in the downlink control region. PCFICH is distributed in the first OFDM symbol in each subframe. PCFICH contains information on the number of OFDM symbols used in the downlink control region, and the terminal can know the downlink control region by demodulating PCFICH. The PHICH includes information related to a retransmission request for a signal transmitted on the uplink, and is distributed in the entire downlink control region. In the downlink control area, an area not used for PCFICH and PHICH is used for transmission of PDCCH. Similarly, the PDCCH is distributed in the downlink control region.

Downlink resource allocation to each terminal device is performed by PDCCH. Each terminal apparatus monitors the PDCCH in the downlink control area, and demodulates the PDCCH when the PDCCH addressed to the terminal is transmitted. The PDCCH includes PDSCH allocation information. Data from the base station apparatus to the terminal apparatus is transmitted using PDSCH. The terminal device receives the data addressed to the terminal by demodulating the allocated PDSCH according to the information. In PDSCH, data common to all terminals is transmitted in addition to data unique to each terminal apparatus. Similarly, PDSCH resource allocation for data transmission common to terminals is also performed by PDCCH. Each terminal apparatus monitors the PDCCH. When a terminal-common PDCCH is transmitted, the terminal apparatus also demodulates the PDCCH, and demodulates the assigned PDSCH according to the demodulation information.

Note that, in addition to the above signals, the downlink signal frame includes a reference signal that serves as a reference when the terminal apparatus demodulates each signal, but is omitted in the figure.

2) Description of Combining Multiple Frequency Bands for Band Extension A set of multiple resource blocks used in an EUTRA signal frame is referred to as an element frequency band (CC). In LTE-Advanced, a technique called frequency band combining that uses a plurality of element frequency bands simultaneously is used. FIG. 17 is a diagram showing the concept of frequency band coupling. By using a plurality of frequency bands simultaneously, high-speed communication can be performed.

Regarding the relationship between the PDCCH to be used for resource allocation at the time of frequency band combination and the allocated PDSCH, a method of performing allocation by closing each element frequency band, a method of performing allocation by combining a plurality of combined frequency bands, etc. Proposed. FIGS. 18 and 19 show a method of performing PDSCH allocation by closing each element frequency band and using PDCCH, and a method of performing PDCCH by combining the entire frequency bands to which PDSCH allocation is combined.

Furthermore, FIG. 20 shows an example when a plurality of terminal devices use a plurality of element frequency bands.

3) Explanation on coding and mapping of downlink transmission block FIG. 21 is a schematic diagram showing a flow concerning coding and mapping of a downlink transmission block of EUTRA. Data transmitted on the downlink of EUTRA is subjected to channel coding such as error correction coding, and coding rate adjustment processing is performed to adjust the size of the data encoded at the transmission rate specified by the retransmission request or the like. In addition, data modulation is performed according to a modulation scheme used in the downlink, and mapping to subcarriers to be actually transmitted is performed. When performing frequency band combination, encoding and mapping of these transmission data is performed by dividing the data for each element frequency band first, then performing each of the divided data, and performing one modulation until data modulation. There is a method in which transmission data is performed and mapping is performed over a plurality of combined frequency bands. 22 and 23, a method of performing transmission block coding to mapping for each element frequency band on the divided data, and data transmission modulation up to one transmission data and combining the mapping Each of the methods for performing mapping over a plurality of frequency bands is shown. Further, an example of a case where a plurality of terminal devices (UE1, UE2) use a plurality of element frequency bands, a method of performing transmission block encoding to mapping for each element frequency band on the divided data, FIG. 24 and FIG. 25 show a method of performing mapping up to a plurality of frequency bands in which mapping is performed by performing processing up to one transmission data until data modulation.

By the way, even if frequency band coupling is performed, considering one of the element frequency bands, this can be used by an LTE terminal that does not support frequency band coupling. Considering a transition period from LTE (Long Term Evolution) to LTE-Advanced, LTE terminals and LTE-Advanced terminals coexist. However, in this case, the PDCCH and mapping target of the LTE terminal are performed on one CC, whereas the PDCCH and mapping target of the LTE-Advanced terminal are performed on a plurality of PDCCHs. Specifically, the PDCCH position and the data mapping position are determined as a function of the frequency bandwidth based on the frequency bandwidth to be used, but when these positions are calculated for different frequency bandwidths, The position is not necessarily exclusive, and there is a possibility that the positions collide. In addition to this, in LTE and LTE-Advanced, various parameters are calculated based on the frequency bandwidth, and they may collide in the same manner. The base station apparatus must perform scheduling and resource allocation so that such a collision does not occur.

Also, for example, when considering a system in which five element frequency bands are combined, there are five element frequency bands to which one LTE terminal can belong. On the other hand, the number of element frequency bands that can be simultaneously used by one LTE-Advanced terminal can be changed, and the maximum number is 31 combinations that select an arbitrary number of element frequency bands from among the five. When the LTE terminal and the LTE-Advanced terminal coexist or when only the LTE-Advanced terminal exists, if the element frequency bands used by the terminals existing therein are different, the base station There is a problem in that the complexity of processing such as scheduling and resource allocation for avoiding parameter collision in the apparatus increases.

In view of such circumstances, the present invention is based on a difference in element frequency bands used by each terminal device in a base station device that performs communication using a plurality of frequency bands, a terminal device, and a wireless communication system including them. It is intended to provide a base station device, a terminal device, a wireless communication system including them, and a program to be executed by the base station, which can reduce restrictions due to complexity of scheduling, resource allocation, arrangement, etc. .

In order to solve the above problems, the present invention relates to a base station apparatus that performs communication using a plurality of frequency bands, a terminal apparatus, and a wireless communication system that includes the base station apparatus, and performs communication using a plurality of frequency bands. The combination of the frequency bands to be used corresponds to the classification of the terminal device, and in the case of using a wider frequency band, in addition to the combination of the frequency bands having a higher priority, the combination of the frequency bands having a lower priority. Are also used, and the communication processing in each combination of frequency bands is performed independently.

According to one aspect of the present invention, in a wireless communication system that performs communication using a plurality of frequency bands, the frequency band used by the terminal device is a combination of one or more of the plurality of frequency bands, The terminal device is classified into a plurality of groups, and a radio communication system is provided in which a combination of the frequency bands to be used is determined for the classification of the terminal device. The wireless communication system prepares a plurality of combinations of a plurality of frequency bands to be used, and terminal devices used in the wireless communication system are classified into a plurality of classifications (groups). The system is characterized in that the system determines (dynamic or static, quasi-static) which frequency band combination to use and assigns it.

It is preferable that one of the classifications of the terminal devices has one frequency band that can be used by the terminal device. This means that the terminal device classified into a certain group can use one frequency band. For example, specifically, an LTE terminal is assumed. A terminal device classified as an LTE terminal is intended to use only one specific frequency band. For example, in FIG. 1 below, LTE terminals are assigned only the combined bands 1 to 5.

In addition, a priority is given to the combination of the frequency bands corresponding to the classification of the terminal device, and the frequency band having a high priority in the combination of the frequency bands according to the classification of the terminal device. In the case of using more frequency bands than the combination of the above, in addition to the combination of the high-priority frequency bands, the combination of the low-priority frequency bands is also used, and the combination of the high-priority frequency bands The first communication process in the second and the second communication process in the lower priority combination are performed independently. By doing so, each terminal device does not need to disclose scheduling information or the like again even when extending the frequency band to be used, and can simply be added to the communication processing so far. Related processing is simplified.

A classification of a first terminal device used when the terminal device uses more frequency bands in a combination of frequency bands corresponding to the classification of the terminal device than a combination of frequency bands having a higher priority. And the combination of the high-priority frequency bands corresponding to the high-priority frequency band combination corresponding to the second terminal device classification different from the first terminal-device classification. It is preferable to allocate the bandwidth. As a result, at this time, a high-priority combined frequency band assigned to a certain terminal device class is excluded from a high-priority combined frequency band assigned to another terminal device class. By allocating so as to be suitable, the frequency band can be used particularly preferentially for the classification of a certain terminal device. For example, it can be allocated to the LTE terminal to reduce the influence on the LTE terminal.

In addition, the present invention is a radio communication system having a resource management unit that manages radio resources used in a base station device, wherein the resource management unit corresponds to a classification of the terminal device used by the terminal device. In the combination of frequency bands, when using a combination of frequency bands with a low priority, a first resource management process in a combination of frequency bands with a high priority in a combination of frequency bands according to the classification, and a priority The wireless communication system may be characterized in that the second resource management process in the combination of low frequency bands is performed independently.

Further, the present invention is a radio communication system having a data division unit that performs transmission data division processing on a base station device, and an element frequency band assignment unit that performs element frequency band assignment processing used by the divided data, The data dividing unit, when using a combination of frequency bands with a low priority in a combination of frequency bands corresponding to the classification of the terminal apparatus used by the terminal apparatus, sets the frequency of transmission data according to the classification. An initial division processing unit that divides transmission data used in a combination of frequency bands with a high priority in a combination of bands and transmission data used in a combination of frequency bands with a low priority; For the transmission data divided by the processing unit, the first division processing and transmission data used in the combination of frequency bands with high priority are performed. Radio communication characterized by independently performing a first element frequency band allocation process, a second division process and a second element frequency band allocation process within a combination of frequency bands having a low priority. It may be a system.

The frequency of signal quality measurement for selecting a combination of frequency bands corresponding to the classification of the terminal apparatus used by the terminal apparatus is performed based on the priority of the combination of frequency bands corresponding to the classification of the terminal apparatus. Is preferred. Thereby, since quality measurement is performed according to priority, the load concerning quality measurement can be reduced.

The signal quality measurement may be performed only in a combination with a high priority in a combination of frequency bands corresponding to the classification of the terminal device. Thereby, the quality measurement for determining whether to move to the area of another base station device or the like is performed according to the priority order, thereby reducing the load on the quality measurement.

It is preferable that the frequency at which the terminal device receives information regarding each frequency band used by the terminal device is based on the priority of the combination of frequency bands according to the classification of the terminal device. As a result, in the present invention, the system information is received according to the priority in the present invention, where the need to measure the middle and low combined frequency bands of the priority is low, so that the load on the system information reception process is reduced. Can do.

The terminal device receives a combination of frequency bands corresponding to the classification of the terminal device, and notifies the combination of the used frequency band to be used from the base station device to the terminal device by using a downlink control channel. It is preferable to change the combination of frequency bands to be used. Thus, by using the PDCCH to notify the priority order, it is possible to quickly change the used combined frequency band and update the parameters associated therewith. Note that it is also possible to reduce the load related to the change by transmitting the priority order by communication in the higher layer without using the PDCCH.

In addition, the present invention is a base station apparatus used in a wireless communication system that performs communication using a plurality of frequency bands, and a plurality of terminals used by the terminal apparatus in consideration of the characteristics of the terminal apparatus transmitted from the terminal apparatus. The base station apparatus is characterized by transmitting a classification of combinations of frequency bands to a terminal apparatus for communication.

According to another aspect of the present invention, there is provided a control method in a base station apparatus used in a radio communication system that performs communication using a plurality of frequency bands, wherein information on a combined frequency band used by the radio communication system is transmitted. And receiving the characteristic information obtained from the terminal device according to this, obtaining a classification of a combination of a plurality of frequency bands used by the terminal device, and transmitting the obtained classification to the terminal device. The control method characterized by this is provided.

According to another aspect of the present invention, there is provided a control method in a terminal apparatus used in a wireless communication system that performs communication using a plurality of frequency bands, the system apparatus receiving base system information, and the terminal apparatus Transmitting to the base station apparatus, and receiving a classification of combinations of a plurality of frequency bands transmitted from the base station apparatus based on the capability information of the terminal apparatus. A control method is provided.

The present invention may be a program for causing a computer to execute the method described above, or a recording medium on which the program is recorded. The program may be acquired from a transmission medium such as the Internet.

This specification includes the contents described in the specification and / or drawings of Japanese Patent Application No. 2009-017011, which is the basis for the priority of the present application.

According to the present invention, in a base station apparatus that performs communication using a plurality of frequency bands, a terminal apparatus, and a radio communication system including the same, scheduling and resources caused by differences in element frequency bands used by each terminal apparatus It is possible to reduce restrictions due to complications such as allocation, arrangement, and the like.

It is a figure showing the combination of the frequency band at the time of combining and using each frequency band in the radio | wireless communications system which communicates using the several frequency band by the 1st Embodiment of this invention. It is a figure which shows an example of the combination of the frequency band which the terminal of each classification | category uses with respect to the classification | category of a terminal device. It is a figure which shows an example of which CC uses a combined band when the combination of the frequency band which a terminal device uses is 6 types. It is a figure showing the relationship between the classification | category of each terminal device, and the coupling frequency band to be used. In the wireless communication system that performs communication using a plurality of frequency bands according to the second embodiment of the present invention, classification of each terminal device when combining and using each frequency band, classification of combinations of frequency bands, It is a figure showing an example in the case of providing a priority order to the combined frequency band to be used in the case of correspondence. It is a figure showing the relationship between the classification | category of each terminal device at the time of providing a priority, and the coupling frequency band to be used. It is a figure showing the resource allocation of PDSCH by PDCCH of the terminal device belonging to the classification UE A of the terminal device. It is a figure showing the encoding process of the terminal device which belongs to the classification UE A of a terminal device. It is the figure which represented the response | compatibility with the classification | category of a terminal device, and the combination of the combined frequency band to be used in one table | surface. It is the figure which showed a mode that the terminal device in this Embodiment performs quality measurement. It is the figure which showed a mode that the terminal device in this Embodiment receives system information. It is the sequence diagram shown about the example of the notification method from the base station apparatus of the combined frequency band which the terminal device in embodiment of this invention uses. It is a functional block diagram showing an example of a structure of the base station apparatus used in embodiment of this invention. It is a functional block diagram showing an example of a structure of the terminal device used in embodiment of this invention. It is a figure which shows the example of a channel structure in EUTRA. It is a schematic diagram which shows the structural example of the downstream signal frame of EUTRA. It is a figure which shows the concept of frequency band coupling | bonding. It is a figure which shows the method of allocating PDSCH for every element frequency band, and performing by PDCCH. It is a figure which shows the method of performing by PDCCH by making the whole frequency band with which allocation of PDSCH was combined into one. It is a figure which shows an example at the time of a some terminal device using a some element frequency band. It is the schematic diagram which showed the flow regarding encoding and mapping of the transmission block of the downlink of EUTRA. It is a figure which shows the method to perform from encoding of a transmission block to mapping for every element frequency band. It is a figure which shows the method of mapping over the some frequency band which combined mapping. It is a figure which shows an example when a some terminal device (UE1, UE2) uses a some element frequency band and performs from encoding of a transmission block to mapping for every element frequency band. It is a figure which shows an example when a some terminal device (UE1, UE2) uses a some element frequency band, and performs mapping over the whole some frequency band.

100, 101 Base station apparatus 201 Terminal apparatus 1 Base station apparatus 3 Data signal processing unit 4 Turbo coding unit 5 Data modulation unit 6 Precoding unit 7 Weighting unit 8 Control signal processing unit 9 Convolution coding unit 10 QPSK modulation unit 11 Precoding Unit 12 Weighting unit 13 Reference signal generation unit 14 Resource management unit 15 Control unit 16 Multiplexing / mapping unit 17 IFFT unit 18 CP insertion unit 20 D / A unit 21 Transmission RF unit 22 Antenna 23 Reception unit 24-27 OFDM transmission unit 31 Terminal Device 32 Antenna 33 Reception RF unit 34 A / D unit 35 CP removal unit 36 FFT unit 37 Demultiplexing unit 38 Channel estimation unit 39 Channel compensation unit 40 Multimode restoration unit 41 Data demodulation unit 42 Turbo decoding unit 43 Channel compensation Unit 44 multiplex mode restoration unit 45 QPSK demodulation unit 46 convolution decoding unit 47 control unit 48 frequency Band determining unit 49 signal quality measuring unit 50 transmits multiplexing unit 51 transmission unit

Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings.

<First Embodiment>
1 (a) and 1 (b) show frequency bands when the frequency bands are combined and used in a wireless communication system that performs communication using a plurality of frequency bands according to the first embodiment of the present invention. It is a figure showing a combination. Here, an example of combining up to five frequency bands is shown. The classification from the coupling band 1 to the coupling band 31 is determined by the combination of coupling of each frequency band.

FIG. 2 is a diagram illustrating an example of combinations of frequency bands used by terminals of each classification with respect to the classification of terminal apparatuses. Here, the terminal devices are classified into five types: UE A, UE B, UE C, UE D, UE E, and UE L. The combination of the combined frequency bands used by UE A uses the combined band 26 shown in FIG. 1, that is, CC1, CC2, CC3, and CC4. Similarly, the combination of the combination frequency bands used by UE B is the combination band 6 shown in FIG. 1, that is, CC1 and CC2, and the combination of the combination frequency bands used by UE L is also shown in FIG. This means that the coupling band 5, that is, CC5 is used. For example, when the terminal device is classified as UE B, the terminal device uses the combined frequency bands CC1 and CC2. In FIG. 1, for the five frequency bands, the combination of the combination bands is 31 which is the maximum number of combinations other than 0 in the five combinations, but it is not always necessary to do so. For example, if the classification of terminal devices used in the system is limited to six types as described above, combinations of frequency bands when combining and using each frequency band are shown in FIG. As shown, six types may be used. In this way, the combination of frequency bands is determined for each system or each cell, and the terminal device uses this combination as system-wide information such as broadcast information before performing actual data communication. If all terminal devices are notified or predetermined, etc., when actually performing data communication, only the terminal device classification and the combination of the combined frequency bands used by each terminal device are notified. As a result, the amount of information related to notification can be reduced. In the case of FIG. 3, since there are six combinations of frequency bands to be used, if an index is given to each combination of the combined bands, the terminal device only needs to notify an index representing one of the six types. A combination of frequency bands to be used can be notified.

The index notification may be an index notification for each combination of the combined bands, or the classification of the terminal device and the combination of the used frequency bands corresponding to the classification of the terminal device may be fixed for each system or cell, If the terminal device performs fixed data and before the terminal device performs actual data communication, for example, the correspondence information is notified to all the terminal devices as information of the entire system, such as broadcast information, each terminal device The combination of frequency bands used by the terminal device can be notified only by notification of the index of the classification of the terminal device.

As shown in FIG. 2, a combination frequency band that uses only one frequency band is assigned to a certain terminal device classification, or one of the combinations of frequency bands as shown in FIG. By assigning a combined frequency band that uses only one frequency band (in this case, CC5), when a terminal that uses this frequency band is limited to, for example, an LTE terminal, the LTE terminal must Only one frequency band can be used, and the system can be simplified. In fact, until LTE-Advanced is introduced, it is operated only in the LTE system, and since there is usually one type of frequency band used by LTE, the classification as an LTE terminal is set to one type, and the classification is assigned. By setting the frequency band to one frequency band, the conventional LTE terminal has an advantage that the same frequency band can be continuously used without selecting a new frequency band. FIG. 4 is a diagram illustrating the relationship of the combination of the classification of each terminal device and the combined frequency band to be used. LTE-Advanced terminals that can use multiple frequency bands are classified from UE A to UE E, conventional LTE terminals are classified from LTE L, and combined frequency bands used by UE A to UE E classification terminals Is used by LTE-Advanced terminals by limiting the combination of multiple frequency bands configured between CC1 to CC4 and limiting the frequency band used by terminals of the LTE L classification to CC5. And the frequency band used by the LTE terminal can be separated.

<Second Embodiment>
FIG. 5 is a diagram illustrating classification of terminal devices when frequency bands are combined and used in a wireless communication system that performs communication using a plurality of frequency bands according to the second embodiment of the present invention. It is a figure showing an example at the time of providing a priority to the combined frequency band to be used in the case of correspondence with a combination. Here, the relationship between the combination of the combined frequency bands and the frequency band is shown in FIG. In the first embodiment, one type of combination frequency band combination is assigned to one terminal device classification, but in this embodiment, a plurality of combinations are assigned to one terminal device classification. A combination of frequency bands is assigned, and a priority is assigned to the classification.

In addition, each terminal device uses only a combination of high-priority combined frequency bands or uses a combination of low-priority combined frequency bands according to an increase or decrease in the number of frequency bands to be used. For example, a terminal device classified as a terminal device (UE) A is assigned a combined band 26, that is, CC1 to CC4, as a combined frequency band having a high priority, and normally uses this combined band. In addition, when the combination band 5, that is, CC 5 is assigned as a combination band having a low priority, and a terminal device classified as the terminal device A needs to use a wider frequency band, this is also combined. The low priority frequency band is also used. That is, CC1 to CC5 are used.

Further, the communication processing at this time is not performed as a new combined frequency band, but as two independent communication processes in the two combined frequency bands. In this way, even if each terminal device or base station device expands the frequency band to be used, it is not necessary to disclose scheduling information or the like again, and if it is performed as an additional form in the previous communication processing The process is simple because it is good

Furthermore, at this time, a high-priority combined frequency band assigned to a certain terminal device class is exclusive of a high-priority combined frequency band assigned to another terminal device class. By allocating in such a manner, the frequency band can be used particularly preferentially for the classification of a certain terminal device. For example, it can be allocated to the LTE terminal to reduce the influence on the LTE terminal.

FIG. 6 is a diagram showing the relationship between the classification of each terminal apparatus when the priority is provided and the combined frequency band to be used. In the frequency band CC5 used by the LTE terminal, which is classified as the terminal device L, the terminals belonging to the classifications of other terminal devices are not set as high priority frequencies. Therefore, there are few opportunities for terminals belonging to other terminal device classifications to use frequencies used by LTE terminals, and the influence on LTE terminals that originally require only one frequency band can be minimized.

In these examples, the correspondence between the classification of the terminal device and the classification of the combined frequency band to be used is represented using two tables, but this is collectively shown in one table as shown in FIG. Also good. Moreover, although the priority is set to three levels of high, medium, and low, more priorities may be provided.

(Resource allocation by PDCCH)
FIG. 7 is a diagram showing PDSCH resource allocation by PDCCH of terminal devices belonging to the classification UE A of the terminal device of FIG. FIG. 7A shows a case where only the combined frequency band having a high priority is used, and PDSCH resource allocation in CC 1 to CC 4 is performed by one PDCCH. Resource allocation (resource management) at this time is performed by the resource management unit based on the combined bandwidth from CC1 to CC4. FIG. 7 (b) is a diagram showing a case where a combined frequency band with a lower priority is used together, and CC1 to CC5 are used. Resource allocation at this time is in CC1 to CC4. PDSCH resource allocation is performed on PDCCH1, and CCSCH PDSCH resource allocation is performed only on PDCCH2. In this way, even when a combined frequency band with a low priority is used together, resource allocation by PDCCH is not performed again based on a new bandwidth, so that resource allocation can be simplified. Even if the combination frequency band is changed in particular, if resource allocation is performed in advance for each priority bandwidth, resource allocation for the corresponding combined frequency band is performed. There is an advantage that a new combined frequency band can be quickly dealt with just by adapting.

(Encoding process)
FIG. 8 is a diagram illustrating an encoding process of a terminal device belonging to the classification UE A of the terminal device. FIG. 8 (a) shows a case where only a high-priority combined frequency band is used. One transmission data is divided into data for each combined frequency band, and channel coding processing is performed for each combined frequency band. , Encoding rate adjustment processing and data modulation are performed, and mapping is performed in each coupling band. FIG. 8B shows a case where a combined frequency band having a lower priority is also used, and CC1 to CC5 are used. At this time, one transmission data is first assigned a higher priority. The data to be transmitted in the combined frequency band having a low priority and the data to be transmitted in the combined frequency band having a high priority are divided into data to be transmitted in the combined frequency band having a low priority. And mapping from CC1 to CC4. Similarly, another channel coding process, a coding rate adjustment process, and data modulation are performed on data transmitted in a low-priority combined frequency band and mapped to CC5.

In this way, even when using a low-priority combined frequency band, the processing performed in the high-priority combined frequency band is not affected. Can be prevented. Even if the classification of the combined use frequency band is changed, if the encoding process is performed in advance for each priority bandwidth in advance, a new transmission rate for the corresponding combined frequency band is obtained. Thus, there is an advantage that a new combined frequency band can be quickly accommodated only by adapting the encoding process according to each bandwidth.

(Signal quality measurement)
The terminal device receives a reference signal and measures its quality as an index for determining which base station device to communicate with. In another embodiment of the present invention, the frequency of this quality measurement is based on the priority of the combination of frequency bands according to the classification of the terminal device. FIG. 10 is a diagram illustrating a state in which the terminal device according to the present embodiment performs quality measurement. The solid line, the alternate long and short dash line, and the broken line of the arrow indicate that the frequency is high, medium, and low in order.

The terminal device 201 belongs to the UE C classification in FIG. That is, CC1 and CC3 are high-priority combined frequency bands, CC2 and CC4 are medium-priority combined frequency bands, and CC5 is a low-priority combined frequency band. Here, it is assumed that the terminal apparatus 201 performs data transmission with the base station apparatus 101 only in the high-priority combined frequency band. In order to use a wider frequency band, it is necessary to measure quality in advance in the frequency band where data transmission is not performed. There is little need to measure the combined frequency band. In the low-priority combined frequency band, the necessity is further reduced. The same applies when measurement is performed for another base station apparatus 102 for handover. In the present embodiment, quality measurement is performed in accordance with the priority order, so that the load on quality measurement can be reduced.

(Frequency band system information)
In addition to receiving and measuring a reference signal for quality measurement, the terminal device receives system information such as frequency bandwidth of each element frequency band, transmission power, and the number of antennas. System information is transmitted from the base station apparatus using PBCH, SCH, or the like. In another embodiment of the present invention, the frequency of reception of this system information is based on the priority of the combination of frequency bands corresponding to the classification of the terminal device. FIG. 11 is a diagram illustrating a state in which the terminal device according to the present embodiment receives system information. The solid line, the alternate long and short dash line, and the broken line of the arrow indicate that the frequency is high, medium, and low in order. The terminal device 201 belongs to the UE C classification in FIG. That is, CC1 and CC3 are high-priority combined frequency bands, CC2 and CC4 are medium-priority combined frequency bands, and CC5 is a high-priority combined frequency band. Here, it is assumed that the terminal apparatus 201 performs data transmission with the base station apparatus 101 only in the high-priority combined frequency band. The system information is periodically transmitted from the base station apparatus 101 through a broadcast channel, a synchronization channel, or the like, but the medium frequency or lower combined frequency band of priority compared to the system information of the frequency band currently performing data transmission. There is little need to make measurements. In the present invention, the system information is received according to the priority order, so the load on the system information receiving process can be reduced.

(Notification method)
FIG. 12 is a sequence diagram illustrating an example of a notification method from the base station apparatus in the combined frequency band used by the terminal apparatus according to the embodiment of the present invention. The base station apparatus 101 matches the classification of the terminal apparatus used by the base station apparatus with the combined frequency band corresponding to the classification of each terminal apparatus, and if there is a priority order, also matches the priority order. Is transmitted and notified as system information (L1). The terminal apparatus 201 that communicates with the base station 101 first transmits to the base station apparatus 101 a terminal capability that represents capabilities such as which element frequency band the terminal device can transmit and receive, and whether or not it is an LTE-Advanced terminal. (L2). The base station apparatus 101 transmits the classification used by the terminal apparatus in consideration of the capability of the terminal apparatus, the distribution of each terminal apparatus, traffic, etc. (S1). When the priority order is provided in the used combined frequency band, the priority order corresponding to the combined frequency band to be transmitted next is also transmitted (L3). The terminal device receives the terminal allocation information of the terminal itself, derives information on the frequency band to be used from the assigned classification and the correspondence between the combined frequency band previously broadcast in (L1), and the band A parameter required for communication is calculated using the width (S2). Thereafter, data transmission is performed (L4).

Next, when changing the frequency band to be used between the base station apparatus and the terminal apparatus, the base station apparatus notifies the terminal apparatus of the priority on the PDCCH (L5). When transmission / reception of data is necessary, the base station apparatus 101 notifies the priority order together on the PDCCH (L5). In the terminal device, when a change in priority order is detected on the PDCCH, information on the frequency band to be used is updated, and parameters according to the updated frequency band are recalculated (S5). Thereafter, data transmission (L6) is performed from the base station apparatus, and the terminal apparatus receives data (S6).

It should be noted that the notification of the priority order using the PDCCH as described above makes it possible to quickly change the used combined frequency band and update the parameters associated therewith. Note that it is also possible to reduce the load related to the change by transmitting the priority order by communication in the higher layer without using the PDCCH.

<Base station equipment>
FIG. 13 is a functional block diagram showing an example of the configuration of the transmission device and the reception device of the base station device used in the embodiment of the present invention.

The base station apparatus 101 receives downlink transmission data to be transmitted. Scheduling information, base station dependent information, terminal device specific information, and the like are also input. These pieces of information are input to the control signal processing unit 8 as control information, processed and transmitted to the terminal device, while some information (broadcast information and notification information) is transmitted to the data signal processing unit 3 in the downlink data transmission format. Input, processed and sent. These signals input to the data signal processing unit 3 are input to the internal turbo coding unit 4.

The turbo coding unit 4 performs error correction coding using a turbo code to increase error tolerance of input data in accordance with a coding rate instruction from the control unit (CPU) 15. The next-stage data modulation unit 5 includes QPSK (Quadrature Phase Shift Keying; four-phase phase shift keying), 16QAM (16 Quadrature Amplitude Modulation), 64QAM (64 Quadrature Amplitude Modulation value, etc.). Among these modulation schemes, the data that has been subjected to error correction coding by the turbo coding unit 4 is modulated by a modulation scheme instructed by the control unit 15. The precoding unit 6 performs phase rotation, weighting, redundancy, and the like on the signal modulated by the data modulation unit 5 based on an instruction from the control unit 15, thereby transmitting each signal to each terminal device. Generate a signal.

The weighting unit 7 weights the signal output from the precoding unit 6 based on an instruction from the control unit 15 and outputs the weighted signal to the multiplexing / mapping unit 16. The weighting unit 7 may be included as a part of the weighting function of the precoding unit 6, but in FIG.

In order to process a plurality of data series, a plurality of data signal processing units 3 are provided. Each processing content is the same. The control information is input to the convolutional code unit 9 of the control signal processing unit 8. The convolutional code unit 9 performs error correction coding using a convolutional code to increase the error tolerance of the input information in accordance with the coding rate instruction from the control unit 15.

The QPSK modulation unit 10 modulates the control information that has been subjected to error correction coding by the convolutional coding unit 9 using the QPSK modulation method. The precoding unit 11 performs phase rotation, weighting, redundancy, and the like on the signal modulated by the QPSK modulation unit 10 based on an instruction from the control unit 15, thereby controlling each antenna to be transmitted to each terminal device. Generate a signal. The weighting unit 12 weights the signal from the precoding unit based on the power determined by the control unit 15 and outputs the signal to the multiplexing / mapping unit 16. The weighting unit 7 may be included as part of the weighting function of the precoding unit 6 as in the case of the data signal processing unit 3.

The reference signal generation unit 13 generates a reference signal transmitted from each transmission / reception antenna 22 of the base station apparatus 1 by performing QPSK modulation based on the identification code specified by the control unit 15.

In the multiplexing / mapping unit 16, each control unit 15 is instructed to transmit each downlink data, control information, and reference signal output from each data signal processing unit 3, control signal processing unit 8, and reference signal generation unit 13. According to the mapping method, the arrangement to the resource element is determined, and a signal for each antenna is generated and sent to the OFDM transmitters 24-27 of each antenna.

Each of the OFDM transmitters 24 to 27 includes an IFFT (Inverse Fourier Transform) unit 17, a CP insertion unit 18, a D / A unit 20, a transmission RF unit 21, and a transmission / reception antenna 22 in order from the input side.

The IFFT unit 17 performs fast inverse Fourier transform on the signal input from the multiplexing / mapping unit 16 to perform OFDM modulation. The CP insertion unit 18 generates a symbol in the OFDM scheme by adding a cyclic prefix (CP) to the OFDM-modulated signal. The cyclic prefix can be obtained by a known method for duplicating a part of the beginning or end of a symbol to be transmitted. The D / A unit 20 D / A converts the baseband digital signal input from the CP insertion unit 18 into an analog signal. The transmission RF unit 21 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit 20, removes an extra frequency component with respect to the intermediate frequency band, and converts the intermediate frequency signal to a high frequency. The signal is converted (up-converted) into the above signal, excess frequency components are removed, power amplification is performed, and the signal is output to the transmission / reception antenna 22. Note that the actual number and configuration of OFDM transmitters differ depending on the base station apparatus.

On the other hand, the uplink signals from the terminal apparatus received by the plurality of antennas are input to the receiving unit 23, synthesized, and demodulated. Signal quality information and terminal capability information transmitted from the terminal device using the uplink signal are input to the control unit 15. The control unit 15 notifies the resource management unit 14 of the terminal device capability, signal quality information, traffic information, and the like. The resource management unit 14 determines the classification of the terminal device and the frequency band information to be used based on the notified information or based on information determined by the system or the like, and generates related control information. The generated control information is transmitted to the terminal device as broadcast information or notification information.

<Terminal device>
FIG. 14 is a functional block diagram illustrating an example of a configuration of a terminal device used in the embodiment of the present invention. As shown in FIG. 14, the terminal device 31 according to the present embodiment includes an antenna 32, a reception RF unit 33, an A / D unit 34, a CP removal unit 35, an FFT unit 36, and a demultiplexing unit 37. A channel estimation unit 38, a channel compensation unit 39, a multimode restoration unit 40, a data demodulation unit 41, a turbo decoding unit 42, a channel compensation unit 43, a multimode restoration unit 44, and a QPSK demodulation. Unit 45, convolution decoding unit 46, control unit 47, frequency band determination unit 48, signal quality measurement unit 49, transmission multiplexing unit 50, and transmission unit 51.

The reception RF unit 33 amplifies the signal received via the reception antenna 32, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and sets the amplification level so that the signal level is properly maintained. Control and perform quadrature demodulation based on the in-phase and quadrature components of the received signal. The A / D unit 34 converts the analog signal orthogonally demodulated by the reception RF unit 33 into a digital signal. The CP removing unit 35 removes a portion corresponding to a cyclic prefix from the digital signal output from the A / D unit 34. The FFT unit 36 performs fast Fourier transform on the signal input from the CP removal unit 35 and performs demodulation of the OFDM method. The propagation path compensation unit 39 to the turbo decoding unit 42 are used for data signal demodulation processing, and the propagation path compensation unit 43 to the convolutional decoding unit 46 are used for control information signal demodulation processing.

Based on an instruction from the control unit 47, the demultiplexing unit 37 extracts a reference signal from the signal that is FFT-transformed by the FFT unit 36, that is, a received signal demodulated by the OFDM method, from the arranged resource elements and outputs the extracted reference signal. Specifically, the demultiplexing unit 37 extracts a reference signal having a fixed arrangement and outputs the reference signal to the propagation path estimation unit 38 and the signal quality measurement unit 49. The demultiplexing unit 37 also separates the downlink data signal and the control information signal. The signal quality measurement unit 49 measures the quality of the received signal at each frequency from the reference signal and notifies the control unit 47 of the quality. Also, signal quality information to be transmitted on the uplink is generated.

The propagation path estimation unit 38 estimates propagation path fluctuations for each of the transmission / reception antenna port 0 to the transmission / reception antenna port 3 of the base station apparatus 1 based on the reception result of the known reference signal separated and extracted by the demultiplexing unit 37, A propagation path fluctuation compensation value is output. The propagation path compensators 39 and 43 compensate the propagation path fluctuation of the input signal based on the propagation path fluctuation compensation value from the propagation path estimation section 38. Multiplex

mode restoration units

40 and 44 determine the signal power determination unit (not shown) based on the multiplexing mode used by the transmission apparatus for the signals compensated for propagation path fluctuations by propagation

path compensation units

39 and 43, respectively. In consideration of data power, the frequency set of each antenna of the transmission signal generated by the transmission apparatus is reproduced and combined to generate a signal before redundancy.

The data demodulation unit 41 demodulates the data signal generated by the multiple mode restoration unit 40. This demodulation is performed corresponding to the modulation method used in the data modulation unit 5 of the base station apparatus 1, and information on the modulation method is instructed from the control unit 47. The turbo decoder 42 decodes the data signal demodulated by the data demodulator 41. Notification information and broadcast information are extracted from the decoded data and input to the control unit 47. Information regarding the used frequency band is input to the frequency band determining unit 48. The QPSK demodulator 45 performs QPSK demodulation of the control information signal generated by the multimode restoration unit 44. The convolutional decoding unit 46 decodes the control information signal demodulated by the multimode restoration unit 44. In the control unit 47, the identification code of the reference signal to be used, information on the arrangement position, weighting information, scheduling information, base station-dependent information, terminal device specific information, received signal quality, frequency band determination unit The used coupling frequency band and the like are also analyzed, and parameters used for communication are set and control of each part of the receiving apparatus is performed according to the analysis information. The transmission multiplexing unit 50 multiplexes transmission data, uplink control information, signal quality information, and the like transmitted on the uplink. In the transmission unit 51, the signal multiplexed by the transmission multiplexing unit 50 is modulated and transmitted from the antenna 32.

As described above, according to the present embodiment, in a base station apparatus that performs communication using a plurality of frequency bands, a terminal apparatus, and a wireless communication system including them, element frequency bands used by each terminal apparatus There is an advantage that constraints due to complications such as scheduling, resource allocation, and arrangement due to differences can be reduced.

In the above-described embodiment, the configuration and the like illustrated in the accompanying drawings are not limited to these, and can be changed as appropriate within the scope of the effects of the present invention. In addition, various modifications can be made without departing from the scope of the object of the present invention. For example, the reference signal identification code generation method, the reference signal arrangement position will be described as a generation method in the main transmission cell, and the arrangement position will be described as a generation method and arrangement position similar to the case where the main transmission cell does not perform cooperative reception. However, this may be different from the generation method and arrangement position when the main transmission cell does not perform cooperative reception. Moreover, although this invention shows the example applied when the cyclic prefix length is a normal length as defined in Non-Patent Document 1, other situations, for example, when the cyclic prefix length is an extended length are shown. It may be applied.

In addition, a program for realizing the functions described in the present embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute processing of each unit. May be performed. The “computer system” here includes an OS and hardware such as peripheral devices.

In addition, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.

Further, the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case is also used to hold a program for a certain period of time. The program may be a program for realizing a part of the above-described functions, or may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

Claims

In a wireless communication system that performs communication using a plurality of frequency bands, a frequency band used by a terminal device is a combination of one or more of the plurality of frequency bands, and the terminal device is classified into a plurality of groups. A wireless communication system, wherein a combination of the frequency bands to be used is determined for the classification of the terminal device.
The wireless communication system according to claim 1, wherein one of the classifications of the terminal devices has one frequency band that can be used by the terminal device.
A priority is given to the combination of the frequency bands corresponding to the classification of the terminal device, and the combination of frequency bands having a high priority in the combination of frequency bands according to the classification of the terminal device by the terminal device. When using more frequency bands, in addition to the combination of the high-priority frequency bands, also use the combination of the low-priority frequency bands,
3. The first communication process in the combination of the frequency bands with the higher priority order and the second communication process in the combination with the lower priority order are performed independently. 3. Wireless communication system.
Corresponds to the classification of a first terminal device used when the terminal device uses more frequency bands than the combination of frequency bands with higher priority in the combination of frequency bands according to the classification of the terminal device. A combination of high priority frequency bands to
4. The frequency band combination having a higher priority corresponding to a second terminal device classification different from the first terminal device classification is assigned to be an exclusive frequency band. The wireless communication system according to 1.
A radio communication system having a resource management unit for managing radio resources used in a base station device,
The resource management unit, when using a combination of frequency bands with a low priority in a combination of frequency bands corresponding to the classification of the terminal device used by the terminal device, within a combination of frequency bands corresponding to the classification The first resource management process in a combination of frequency bands with a high priority and the second resource management process in a combination of frequency bands with a low priority are performed independently. 4. The wireless communication system according to 4.
A wireless communication system having a data division unit that performs transmission data division processing on a base station device, and an element frequency band assignment unit that performs element frequency band assignment processing used by the divided data,
The data dividing unit, when using a combination of frequency bands with a low priority in a combination of frequency bands corresponding to the classification of the terminal apparatus used by the terminal apparatus, sets the frequency of transmission data according to the classification. An initial division processing unit that divides transmission data used in a combination of frequency bands with a high priority in a combination of bands and transmission data used in a combination of frequency bands with a low priority; For the transmission data divided by the processing unit, the first division processing and the first element frequency band allocation processing in the transmission data used in the combination of the frequency bands with high priority, and the frequency band with low priority 4. The radio according to claim 3, wherein the second division processing in the combination and the second element frequency band allocation processing are performed independently. 5. Shin system.
The frequency of signal quality measurement for selecting a combination of frequency bands corresponding to the classification of the terminal apparatus used by the terminal apparatus is performed based on the priority of the combination of frequency bands corresponding to the classification of the terminal apparatus. The wireless communication system according to claim 3 or 4, characterized by the above.
The radio communication system according to claim 7, wherein the signal quality measurement is performed only in a combination having a high priority in a combination of frequency bands corresponding to the classification of the terminal device.
The frequency with which the terminal device receives information on each frequency band used by the terminal device is based on a priority of a combination of frequency bands according to the classification of the terminal device. Wireless communication system.
The terminal device receives a combination of frequency bands corresponding to the classification of the terminal device, and notifies the combination of the used frequency band to be used from the base station device to the terminal device by using a downlink control channel. The wireless communication system according to any one of claims 1 to 4, wherein a combination of frequency bands to be changed is changed.
A base station apparatus used in a wireless communication system that performs communication using a plurality of frequency bands, and a combination of a plurality of frequency bands used by the terminal apparatus in consideration of the characteristics of the terminal apparatus transmitted from the terminal apparatus A base station apparatus that performs communication by transmitting a classification to a terminal apparatus.
A control method in a base station apparatus used in a wireless communication system that performs communication using a plurality of frequency bands,
Transmitting information of a combined frequency band used by the wireless communication system, receiving characteristic information obtained from the terminal device according to the information, and obtaining a combination of a plurality of frequency bands used by the terminal device;
And a step of transmitting the obtained combination to the terminal device.
A program for causing a computer to execute the method according to claim 12.
A control method in a terminal device used in a wireless communication system that performs communication using a plurality of frequency bands,
Receiving system information from the base station device and transmitting capability information of the terminal device to the base station device;
Receiving a combination of a plurality of frequency bands sent from the base station device based on the capability information of the terminal device;
A control method characterized by comprising:
A program for causing a computer to execute the method according to claim 14.