Source: https://patents.google.com/patent/JP4594451B2/en
Timestamp: 2020-01-28 14:49:23
Document Index: 281515656

Matched Legal Cases: ['art, 3', 'art, 4', 'art, 5', 'art, 7', 'art, 11', 'art, 15', 'art, 17', 'art, 21', 'art, 22', 'art, 23', 'art, 27', 'art, 28', 'art, 31']

JP4594451B2 - Mobile communication system, base station apparatus, mobile station apparatus, and mobile communication method - Google Patents
Mobile communication system, base station apparatus, mobile station apparatus, and mobile communication method Download PDF
JP4594451B2
JP4594451B2 JP2010509207A JP2010509207A JP4594451B2 JP 4594451 B2 JP4594451 B2 JP 4594451B2 JP 2010509207 A JP2010509207 A JP 2010509207A JP 2010509207 A JP2010509207 A JP 2010509207A JP 4594451 B2 JP4594451 B2 JP 4594451B2
JP2010509207A
JPWO2009131163A1 (en
聖二 佐藤
2008-04-25 Priority to JP2008114730 priority Critical
2008-04-25 Priority to JP2008114730 priority
2009-04-23 Application filed by シャープ株式会社 filed Critical シャープ株式会社
2009-04-23 Priority to PCT/JP2009/058038 priority patent/WO2009131163A1/en
2010-12-08 Publication of JP4594451B2 publication Critical patent/JP4594451B2/en
2011-08-18 Publication of JPWO2009131163A1 publication Critical patent/JPWO2009131163A1/en
When transmission of a downlink signal is to be performed in sub-frame 5, at this point, no feedback of reception quality information and transmit signal pre-coding information in mode 2, which would be covered by transmit signal pre-coder confirmation, has been performed. Therefore, information on the pre-coding that has been applied to all assigned resources is transmitted by being added to a downlink control signal (353). In sub-frame 9, a downlink signal is transmitted, and transmit signal pre-coder confirmation is added thereto. With respect to this case, the mobile station apparatus determines that the downlink signal has been pre-coded using the transmit signal pre-coding information transmitted in sub-frame 8, and demodulates the received signal with it. Sub-frame 12 represents a case where downlink data is transmitted by assigning sub-band 7. In so doing, it is preferable that the base station apparatus use the reception quality information and transmit signal pre-coding information for sub-band 7 reported in sub-frame 10. Accordingly, the base station apparatus transmits to the mobile station apparatus the transmit signal pre-coding information obtained in sub-frame 10 by explicitly including it in downlink control information (358). Thus, in cases where there exist a plurality of modes for transmitting transmit signal pre-coding information, it is possible to solve the problem where information whose priority should be high is readily overwritten by information of low priority.
The present invention relates to a mobile communication system in which a mobile station apparatus measures reception quality of a signal received from a base station apparatus and transmits reception quality information to the base station apparatus, a base station apparatus applied to the mobile communication system, and mobile The present invention relates to a station apparatus and a mobile communication method.
3GPP (3rd Generation Partnership Project) is a network specification that develops a system that develops a system that develops the basic system of W-CDMA (Wideband-Code Division Multiple Access) and GSM (Global System for Mobile Communications). is there. In 3GPP, the W-CDMA system is standardized as a third generation cellular mobile communication system, and services are started sequentially. In addition, HSDPA (High-Speed Downlink Packet Access), which further increases the communication speed, has been standardized and the service has started. In 3GPP, the evolution of the third generation radio access technology (Evolved Universal Terrestrial Radio Access: hereinafter referred to as E-UTRA) is being studied.
As a downlink communication system in E-UTRA, an OFDMA (Orthogonal Frequency Multiple Access) system that performs user multiplexing using mutually orthogonal subcarriers has been proposed. In the OFDMA scheme, a technique such as an adaptive modulation and coding scheme (AMCS) based on adaptive radio link control such as channel coding is applied. AMCS is a method for switching radio transmission parameters such as an error correction coding rate and a data modulation multi-value number in accordance with the propagation path status of each mobile station apparatus in order to efficiently perform high-speed packet data transmission. . For example, for data modulation, as the propagation path condition becomes better, switching from QPSK (Quadrature Phase Shift Keying) modulation to multi-value modulation method with higher modulation efficiency such as 16QAM (Quadrature Amplitude Modulation) modulation, 64QAM modulation, etc. Thus, the maximum throughput of the mobile communication system can be increased. The combination of the modulation scheme and the coding rate is called MCS (Modulation and Coding Scheme).
In OFDMA, a communicable region can be divided into a frequency region and a time region that physically correspond to subcarriers. A group of these divided areas is called a resource block, and one or several resource blocks are allocated to each mobile station apparatus, and communication is performed by multiplexing a plurality of mobile station apparatuses.
In order for the base station apparatus and each mobile station apparatus to perform communication at the optimum quality and speed according to the request, resource block allocation and transmission method considering reception quality in each subcarrier of each mobile station apparatus Determination is necessary. Since the transmission system and scheduling are performed by the base station apparatus, and in the frequency division duplex (FDD), the situation of the downlink propagation path can be known only by the corresponding mobile station apparatus. In order to realize this, each mobile station apparatus needs to perform feedback of reception quality to the base station apparatus.
Also, in E-UTRA, in order to increase the channel capacity, SM (Space Multiplexing) technology using MIMO (Multiple Input Multiple Output), SFBC (Space-Frequency Block Diversity) transmission diversity, etc. Use is proposed. Using MIMO, it is possible to form multiple propagation paths as a space due to the influence of multipath, multiplex and transmit multiple information, combine the power of multiple transmit antennas on the receiving side, and obtain reception gain It becomes. Here, these are collectively referred to as MIMO. In E-UTRA, use of SM and transmission diversity by MIMO is assumed in the downlink, and which method is used for communication is determined in consideration of a propagation path condition between the base station apparatus and the mobile station apparatus. At the time of using MIMO / SM, in order to facilitate separation processing of a plurality of spatial multiplexing sequences transmitted from each antenna, it has been studied to preprocess a transmission signal sequence in advance in a base station apparatus. Since the base station apparatus cannot calculate the transmission signal preprocessing information, each mobile station apparatus must feed back the transmission signal preprocessing information to the base station apparatus.
The reception quality information described above is information corresponding to MCS that is optimal for reception / demodulation operations in the mobile station apparatus, and the base station apparatus determines the modulation method and coding rate of the downlink signal based on this information. Further, since this value changes depending on the transmission signal preprocessing sequence, the reception quality information is fed back in association with the transmission signal preprocessing information. Here, the reception quality information and the transmission signal preprocessing information are collectively referred to as feedback information.
Regarding a method for transmitting such feedback information (hereinafter referred to as “mode”), several methods have been studied in E-UTRA. Broadly classified, there are classification by channel (PUSCH, PUCCH), classification by transmission frequency (single transmission or multiple transmission), classification by frequency granularity of transmitted information, and the like.
<Classification by channel>
It is possible to use a plurality of channels having different physical characteristics for channels using feedback information. As candidates for this channel, E-UTRA uses PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel). Use is under consideration. The PUCCH is a channel designed mainly for transmitting control information such as ACK / NACK (positive acknowledgment, negative acknowledgment). In E-UTRA, this is designed with a capacity of about 20 bits. Further, the PUCCH is designed to have good interference characteristics and high reliability by using code spreading. PUSCH is a channel designed mainly for the purpose of transmitting data, and can transmit information on the order of 100 bits depending on the size of allocated resources. It is also possible to change the coding rate according to the propagation path. With regard to feedback of reception quality information and transmission signal preprocessing information, it is assumed that PUCCH is used when transmitting coarse information, and PUSCH is used when transmitting detailed information. Channels that are suitable for use are used.
<Classification by transmission frequency>
Since the reception quality information and the transmission signal preprocessing information are determined depending on the state of the propagation path, it is preferable that the reception quality information and the transmission signal preprocessing information are periodically transmitted from the mobile station apparatus to the base station apparatus according to the propagation path variation. And it is desirable from the viewpoint of overhead reduction that the resources for transmitting these information are allocated by one operation from the base station apparatus. In this operation, a mode in which a plurality of resources continued from that point is allocated is called periodic allocation.
On the other hand, there are cases where it is desired to request feedback at a specific timing when resources are not periodically allocated or when feedback information obtained in this mode is insufficient for a flexible frequency schedule. On the other hand, the base station apparatus can request the mobile station apparatus to transmit the reception quality information and the transmission signal preprocessing information only once using the specified resource. A mode in which reception quality information and transmission signal preprocessing information using resources allocated in this operation are fed back is referred to as aperiodic allocation.
<Classification by frequency granularity>
The modulation scheme and preprocessing applied to the downlink signal are desirably applied in units of subcarriers in OFDM, that is, in the minimum unit of the processing system, from the viewpoint of improving characteristics. However, if the granularity of the calculation is too detailed, the amount of information transmitted from the mobile station apparatus to the base station apparatus becomes too large, which may cause a shortage of resources. Further, adjacent subcarriers have a high correlation with the channel conditions, and feedback for every subcarrier is a waste of resources. Therefore, it is effective to reduce the overhead by grouping consecutive subcarriers or resource blocks in a fixed number (called “subband”) and feeding back one piece of information to them. Become. In E-UTRA, as a method for realizing this, among the subband groups restricted by the base station apparatus,
(1) One reception quality information (referred to as “wideband reception quality information”) applicable to all of this and one transmission signal preprocessing information (this is referred to as “wideband transmission signal preprocessing information”). ) Feedback,
(2) Feed back one reception quality information and transmission signal preprocessing information applied to several subbands selected by the mobile station apparatus, and position information of the subbands;
(3) transmitting one reception quality information and transmission signal preprocessing information for each of the subbands;
Various feedback modes such as these have been studied. It is also possible to use any combination of these (1) (from (3) to (3). The reception quality information and the transmission signal preprocessing information fed back by these may have fewer target subbands. The smaller the number, the more specialized the frequency band, and the characteristic is improved.
By appropriately combining and using the above (1) to (3), the base station apparatus can obtain optimal reception quality information and transmission signal preprocessing information for downlink communication. Here, the feedback method of reception quality information and transmission signal preprocessing information defined by a combination of the above classifications is called a feedback mode. The base station apparatus performs preprocessing on the downlink data signal with reference to the feedback information, applies the modulation scheme / coding rate according to the reception quality information, and transmits it to the mobile station apparatus. At this time, the mobile station apparatus cannot correctly demodulate the downlink data unless it knows the specific preprocessing. For this reason, the preprocessing information applied to the downlink data signal is transmitted by being included in the control information transmitted simultaneously with the downlink data.
If one transmission signal preprocessing information is transmitted for each subband, there is a problem that the number of necessary transmission signal preprocessing information differs depending on the number of subbands allocated to the downlink. As a result, the format of the downlink control information becomes a variable size, and the mechanism for identifying the format in the mobile station apparatus becomes complicated. Furthermore, the number of bits required for notification of transmission signal pre-processing information increases according to the number of downlink resource block allocations, which increases the overhead of a channel for transmitting downlink control information. It was.
In order to solve the above problem, the base station apparatus uses the latest transmission signal preprocessing information fed back from the mobile station apparatus, and represents information indicating that downlink signal preprocessing has been performed (hereinafter referred to as this). Is referred to as “transmission signal preprocessing sequence confirmation information”) and transmitted in the downlink control information (see Non-Patent Document 1 below). This information can be expressed by 1 bit, and has become a problem when explicitly including transmission signal preprocessing information in downlink control information, and the problem of format complication and the problem of increase in the number of bits Both can be solved. Furthermore, when this method is used, if an error occurs when feedback of transmission signal preprocessing information occurs, the transmission signal preprocessing information represented by the transmission signal preprocessing sequence confirmation information differs between the base station apparatus and the mobile station apparatus. There is a problem. In order to avoid this, it is proposed that error detection information is added to the transmission signal preprocessing information, and when the base station apparatus detects an error, preprocessing predetermined by the mobile station apparatus and the base station apparatus is performed. ing.
Furthermore, it has been proposed that one piece of transmission signal preprocessing information can be transmitted to the downlink control information for flexibility when an error occurs in feedback of transmission signal sequence number information. At this time, since the mobile station apparatus can use any transmission signal preprocessing information, it is possible to provide flexibility in downlink communication (see Non-Patent Document 2 below).
"PMI Downlink Signaling and Downlink PDCCH Format", 3GPP TSG RAN WG1 # 49bis, R1-073077 "MIMO Related DL Control Signaling", 3GPP TSG-RAN WG1 # 51, R1-074844
However, in the background art as described above, since the transmission signal preprocessing information that has been fed back to the latest is always valid, there are reports on a situation where there are a plurality of transmission signal preprocessing information feedback modes and a plurality of subframes. When information to be transmitted is divided and transmitted, it is not always appropriate to use reception quality information and transmission signal preprocessing information that have been fed back recently. This will be described with reference to FIGS.
13 and 14 show two feedback modes (mode 1 and mode 2) used simultaneously in this example. Here, the number of subbands that can be used by the system is 10 (1 to 10), and subbands 3 to 8 are set in the base station apparatus as feedback targets. The information to be fed back describes only reception quality information and transmission signal preprocessing information.
FIG. 13 shows a feedback mode using PUCCH. Wideband reception quality information, wideband transmission signal preprocessing information (1301), some subband reception quality information, and subband transmission signal preprocessing information. The position information of the selected subband can be transmitted. The subband reception quality information and the subband transmission signal preprocessing information are a group of consecutive subbands (herein referred to as “subband groups”, 1302 to 1304), and the mobile station apparatus arbitrarily The reception quality information and the transmission signal preprocessing information calculated for the subband selected in the above. In this example, for the sake of simplicity, each subband group is composed of two subbands, one of which is selected by the mobile station apparatus, and subband reception quality information and subband transmission signal preprocessing information. Is supposed to be fed back.
The feedback by PUCCH cannot transmit all information at once because of the limitation on the number of bits that can be transmitted. Therefore, feedback for the wideband (1301) and feedback for each subband group (subband group A 1302, subband group B 1303, and subband group C 1304) are performed using different subframes. . In this specification, this feedback mode is referred to as mode 1.
FIG. 14 is a diagram illustrating a feedback mode in which information of each subband can be transmitted in a batch in PUSCH, and transmission signal preprocessing information corresponding to each subband can be transmitted by the number of subbands. As for the reception quality information, it is possible to transmit one wideband value and a value corresponding to the difference value from the wideband value to the subband in order to reduce the number of bits. Since the method can be arbitrarily used, the description is omitted here. These are transmitted collectively in one subframe. Here, this feedback mode is referred to as mode 2.
In the example of the feedback mode shown in FIG. 13 and FIG. 14, the number of pieces of reception quality information corresponding to one subband (or wideband) is one for simplicity. On the other hand, when a plurality of sequences are spatially multiplexed by MIMO / SM, the present invention can also be applied to a case of transmitting a plurality of reception quality information for the purpose of applying different MCS to each.
FIG. 11 is a diagram showing a sequence in the mobile station apparatus and the base station apparatus according to Non-Patent Document 1, and at which point the downlink signal transmitted with the transmission signal preprocessing sequence confirmation information is fed back. It shows whether the transmission signal preprocessing information is supported. Here, the transmitted and received transmission signal pre-processing information is used as an interpretation of transmission signal pre-processing sequence confirmation information in the base station apparatus and the mobile station apparatus "application to transmission signal pre-processing sequence confirmation information" or It is simply called “application”. In FIG. 11, reference numeral 1110 denotes a base station apparatus and a mobile station apparatus for determining which transmission signal preprocessing information is used for which subband when a downlink signal is transmitted together with transmission signal preprocessing sequence confirmation information. Is a table of transmission signal preprocessing information managed in the above, and changes according to the timing of sending and receiving feedback information. Here, a processing delay with respect to feedback information is not considered, and a certain offset may exist in the application timing. W in reference numeral 1110 indicates that the wideband transmission signal preprocessing information transmitted in the subframe is applied, and S indicates that the subband transmission signal preprocessing information is applied. And the arrow currently described downward starting from these has shown the period when these transmission signal pre-processing information is applied continuously.
In the example illustrated in FIG. 11, resources for performing feedback in mode 1 are provided from subframes 1 to 16 in a period of 3 subframes, and feedback using these resources is performed. Further, in subframe 10, feedback in mode 2 is performed. The detailed operation in each subframe is described below.
In subframe 1, wideband transmission signal preprocessing information is transmitted in mode 1 (1101). In this state, it is assumed that transmission signal preprocessing information has not been transmitted / received in the past, and the received value is applied to transmission signal preprocessing sequence confirmation information in all subbands. In subframes 4 and 7, transmission signal preprocessing information is transmitted only to subbands 3 and 6, respectively, and these are applied (1102, 1103). In subframe 8, aperiodic feedback in mode 2 is performed, and subband transmission signal preprocessing information is transmitted to subbands 3 to 8. Then, all transmission signal preprocessing information is overwritten and applied (1104). In subframe 10, transmission signal preprocessing information of subband 7 in mode 1 is transmitted and applied (1105).
Next, in subframe 13, wideband transmission signal preprocessing information is transmitted in mode 1, but since transmission signal preprocessing information is applied with time priority, subband transmission signal preprocessing transmitted and received in subframe 8 is performed. All information is overwritten and applied (1106). In subframe 16, transmission signal preprocessing information is transmitted only to subband 4, and these are applied (1107).
However, in the above processing, in the processing of subframe 13, the wideband transmission signal preprocessing signal transmitted in mode 1 is overwritten and applied to all the subband information transmitted in subframe 8 in accordance with the time priority rule. I'm stuck. Since the subband transmission signal preprocessing information transmitted aperiodically in mode 2 is originally lacking PUCCH information, it has the purpose of being used when detailed information is required from the base station apparatus. An operation in which the transmission signal preprocessing information for each subband to which the non-detailed wideband transmission signal preprocessing information that is not transmitted in detail is transmitted on the PUCCH is immediately overwritten is not desirable.
With such an operation, when there are a plurality of modes for transmitting the transmission signal preprocessing information, there is a problem that information that should have a high priority is immediately overwritten by information with a low priority.
An object of the present invention is to solve the above-mentioned problem of being overwritten immediately.
According to an aspect of the present invention, in a mobile communication system including a base station device and a mobile station device, the mobile station device provides feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal, Based on one of a plurality of types of feedback schemes that can be set simultaneously, the base station device transmits a pre-processed downlink signal and a transmission signal before the transmission signal representing the sequence used for the pre-processing. The transmission signal preprocessing information represented by the transmission signal preprocessing sequence confirmation information is processed sequence confirmation information corresponding to information transmitted by a part of the plurality of types of feedback schemes. A mobile communication system is provided that transmits processing sequence confirmation information to the mobile station apparatus.
The above configuration can be applied to each of the mobile station apparatus and the base station apparatus. For the part of the schemes, it is preferable that a signal designating the scheme is notified from the mobile station apparatus to the base station apparatus.
According to another aspect of the present invention, there is provided a communication method in a mobile communication system including a base station device and a mobile station device, wherein the mobile station device indicates information for preprocessing a transmission signal. Feedback information including the step of transmitting to the base station apparatus based on any of a plurality of types of feedback schemes that can be set simultaneously, the downlink signal preprocessed by the base station apparatus, and the preprocessing Transmission signal pre-processing sequence confirmation information representing a used sequence, wherein the transmission signal pre-processing information represented by the transmission signal pre-processing sequence confirmation information is transmitted by a part of the plurality of types of feedback schemes. And transmitting transmission signal pre-processing sequence confirmation information corresponding to the received information to the mobile station apparatus. A mobile communication method is provided.
Also, in a mobile communication system including a base station apparatus and a mobile station apparatus, the mobile station apparatus can simultaneously set feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal. Transmitting to the base station apparatus based on the scheme, the base station apparatus pre-processes the downlink signal and transmits it to the mobile station apparatus, and also represents a transmission signal pre-processing sequence representing the sequence used for the pre-processing Confirmation information is transmitted to the mobile station apparatus together with the downlink signal, and the transmission signal preprocessing sequence confirmation information indicates which of the plurality of feedback methods corresponds to the transmission signal preprocessing information transmitted A mobile communication system characterized by including information is provided. The above configuration can be applied to each of the mobile station apparatus and the base station apparatus.
According to another aspect of the present invention, there is provided a communication method in a mobile communication system including a base station device and a mobile station device, wherein the mobile station device transmits information for preprocessing a transmission signal. Transmitting to the base station apparatus based on a plurality of types of feedback methods that can be set simultaneously, and the base station apparatus performs preprocessing on the downlink signal and transmits it to the mobile station apparatus. Transmitting transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing to a mobile station apparatus together with a downlink signal, and the transmission signal preprocessing sequence confirmation information is one of the plurality of feedback schemes Including a step of including information indicating whether the transmission signal pre-processing information transmitted in step S1 corresponds to the transmission signal pre-processing information.
Further, in a mobile communication system including a base station device and a mobile station device, the mobile station device transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station device, and The feedback information is transmitted based on a plurality of types of feedback schemes that can be set at the same time, and the base station apparatus preprocesses the downlink signal and transmits it to the mobile station apparatus, and the sequence used for the preprocessing is transmitted. The transmitted transmission signal preprocessing sequence confirmation information is transmitted to the mobile station apparatus together with the downlink signal, and the sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is transmitted from the mobile station apparatus to the base station apparatus. Among the plurality of transmission signal preprocessing information, the transmitted or received time information, the difference in the feedback method, and the transmission signal preprocessing information There wireless communication mobile communication system, wherein a priority is calculated by using one or more of the width of the corresponding frequency channel adopts the highest one is provided. The above configuration can be applied to each of the mobile station apparatus and the base station apparatus. It is preferable that the priority is set to be low as time elapses from the timing at which the transmission signal preprocessing information to be transmitted / received is transmitted. Further, it is preferable that the correspondence of the sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is canceled after a certain time.
According to another aspect of the present invention, there is provided a communication method in a mobile communication system in which a mobile station apparatus measures reception quality of a signal received from a base station apparatus and transmits reception quality information to the base station apparatus. The station device transmits feedback information including transmission signal pre-processing information indicating information for pre-processing the transmission signal to the base station device, and the feedback information is transmitted based on a plurality of types of feedback schemes that can be set simultaneously. And the base station device preprocesses the downlink signal and transmits it to the mobile station device, and transmits the transmission signal preprocessing sequence confirmation information representing the sequence used for the preprocessing together with the downlink signal to the mobile station device. The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is transmitted from the mobile station apparatus to the base station apparatus. Of the transmitted transmission signal preprocessing information, based on the priority using one of the time of transmission or reception, the difference in the feedback scheme, and the width of the frequency channel to which the transmission signal preprocessing information is applied The mobile communication method is characterized in that the determination is performed.
According to the present invention, when there are a plurality of transmission signal preprocessing information transmission modes, and when notifying the preprocessing sequence applied to the downlink signal using the transmission signal preprocessing sequence confirmation information, It is possible to avoid the problem that the transmission signal preprocessing information that should have a high priority is immediately overwritten by the transmission preprocessing information that has a low priority.
It is a functional block diagram which shows the example of 1 structure of the base station apparatus by embodiment of this invention. It is a functional block diagram which shows the example of 1 structure of the mobile station apparatus by embodiment of this invention. In the mobile communication system according to the present embodiment, a sequence diagram showing a flow of processing between the base station device and the mobile station device, and transmission signal preprocessing information transmitted and received by the mobile station device and the base station device in each subframe And a table showing a state of application of transmission signal sequence number information to transmission signal preprocessing sequence confirmation information in each subframe. The sequence diagram for demonstrating the flow of the process between the base station apparatus of the mobile communication system by the 2nd Embodiment of this invention, and a mobile station apparatus, It transmits / receives by the mobile station apparatus and base station apparatus in each sub-frame The table which shows the transmission signal pre-processing information which is transmitted, and the table which shows the application condition to the transmission signal pre-processing sequence confirmation information of the transmission signal sequence number information in each sub-frame. It is a figure which shows the feedback mode which transmits wideband reception quality information and transmission signal pre-processing information in PUCCH (mode 3). Feedback mode in which all wideband reception quality information and transmission signal preprocessing information and one reception quality information and transmission signal preprocessing information applied to multiple subbands selected by the mobile station apparatus are transmitted using PUSCH. It is. It is a figure which shows the operation | movement which notifies reception quality information and transmission signal pre-processing information from the mobile station apparatus to a base station apparatus in each sub-frame. Feedback mode in which all wideband reception quality information and transmission signal preprocessing information and one reception quality information and transmission signal preprocessing information applied to a plurality of subbands selected by the mobile station apparatus are transmitted using PUSCH. FIG. It is a figure which shows the mode (mode 6) which transmits simultaneously with one sub-frame using PUSCH about each reception quality information and transmission signal pre-processing information corresponding to all the subbands. The sequence diagram for demonstrating the flow of the process between the base station apparatus of the mobile communication system by the 4th Embodiment of this invention and a mobile station apparatus, and transmission / reception by a mobile station apparatus and a base station apparatus in each sub-frame It is a figure which shows the table which shows the application status to the transmission signal pre-processing sequence confirmation information of the transmission signal pre-processing information to be transmitted, and the transmission signal sequence number information in each subframe. It is a figure which shows the sequence in the mobile station apparatus according to a nonpatent literature 1, and a base station apparatus. The sequence diagram for demonstrating the flow of the process between the base station apparatus of the mobile communication system which concerns on the 5th Embodiment of this invention, and a mobile station apparatus, and transmission of the transmission signal sequence number information in each sub-frame It is a figure which shows the table which shows the application condition to signal pre-processing series confirmation information. It is a figure which shows two feedback modes (mode 1 and mode 2) utilized simultaneously. It is a figure which shows two feedback modes (mode 1 and mode 2) utilized simultaneously. The sequence diagram for demonstrating the flow of the process between the base station apparatus of the mobile communication system by the 6th Embodiment of this invention and a mobile station apparatus, and the transmission signal of the number information of transmission signal series in each sub-frame It is a figure which shows the table which shows the application condition to pre-processing series confirmation information. The sequence diagram for demonstrating the flow of the process between the base station apparatus of the mobile communication system by the 7th Embodiment of this invention and a mobile station apparatus, and the transmission signal of the number information of transmission signal series in each sub-frame It is a figure which shows the table which shows the application condition to pre-processing series confirmation information. The sequence diagram for demonstrating the flow of a process between the base station apparatus of the mobile communication system which concerns on the 8th Embodiment of this invention, and a mobile station apparatus, and transmission of the transmission signal sequence number information in each sub-frame It is a figure which shows the table which shows the application condition to signal pre-processing series confirmation information.
DESCRIPTION OF SYMBOLS 1 ... Data control part, 3 ... Modulation encoding part, 4 ... Transmission signal pre-processing part, 5 ... Mapping part, 7 ... Inverse fast Fourier transform (IFFT) part, 11 ... Radio transmission part, 15 ... Radio reception part, 17 DESCRIPTION OF SYMBOLS ... Fast Fourier transform (FFT) part, 21 ... Inverse discrete Fourier transform (IDFT) part, 22 ... Demodulation decoding part, 23 ... Data extraction part, 27 ... Transmission information control part, 28 ... Antenna, 25 ... Scheduler part, 31 ... modulation code control unit, 33 ... frequency selection scheduler unit, 35 ... transmission signal preprocessing control unit, 36 ... spatial multiplexing control unit.
Hereinafter, a communication technique according to an embodiment of the present invention will be described with reference to the drawings. In addition, in the following description, although the case where this invention is embodied in a mobile communication system is demonstrated, it is not limited to this. For example, mobile communication methods and the like fall within the scope of the present invention.
The mobile communication system according to the first embodiment of the present invention includes a base station device and a mobile station device. FIG. 1 and FIG. 2 are functional block diagrams showing one configuration example of each of a base station apparatus and a mobile station apparatus according to the present embodiment. 1, the base station apparatus includes a data control unit 1, a modulation and coding unit 3, a transmission signal preprocessing unit 4, a mapping unit 5, an inverse fast Fourier transform (IFFT) unit 7, a wireless transmission unit 11, a wireless reception unit 15, A fast Fourier transform (FFT) unit 17, an inverse discrete Fourier transform (IDFT) unit 21, a demodulation / decoding unit 22, a data extraction unit 23, a transmission information control unit 27, and an antenna 35 are provided.
The transmission information control unit 27 includes a scheduler unit 25, a modulation code control unit 31, a frequency selection scheduler unit 33, a transmission signal preprocessing control unit 35, and a spatial multiplexing control unit 36. The antenna 35 includes a plurality of antennas necessary for MIMO / SDM communication.
The data control unit 1 receives transmission data and control data to be transmitted to each mobile station device, and each data is sequentially transmitted to the mobile station device in accordance with an instruction from the transmission information control unit 27. When MIMO / SM is applied, the output data is divided into a plurality of transmission sequences according to the information of the spatial multiplexing control unit 36 of the transmission signal.
The modulation coding unit 3 performs modulation processing and error correction coding processing on the signal input from the data control unit 1 based on the modulation scheme and coding rate by the transmission information control unit 27, and transmits the signal before the transmission signal. Output to the processing unit 4. The transmission signal preprocessing unit 4 processes the signal input from the modulation encoding unit 3 based on the control information input from the transmission information control unit 27 and outputs the processed signal to the mapping unit 5.
The mapping unit 5 maps the data output from the modulation encoding unit 3 on each subcarrier based on the frequency selection scheduling information input from the transmission information control unit 27 and outputs the data to the inverse fast Fourier transform unit 7 To do. The inverse fast Fourier transform unit 7 performs an inverse fast Fourier transform process on the data output from the mapping unit 5, converts the data to a time-series signal, and outputs the signal to the wireless transmission unit 11.
The output signal from the inverse fast Fourier transform unit 7 is digital / analog converted in the radio transmission unit 11, up-converted to a frequency suitable for transmission, and then transmitted to each mobile station device via the antenna 28.
The scheduler unit 25 performs downlink scheduling and uplink scheduling based on control information such as a resource region that can be used by each mobile station device, intermittent transmission and reception cycles, a transmission data channel format, and buffer status, Controls the change of the number of transmission signal sequences. The modulation code control unit 31 determines a modulation scheme and a coding rate to be applied to data for each mobile station apparatus based on reception quality information transmitted from the mobile station apparatus.
The frequency selection scheduler 33 performs frequency selection scheduling processing applied to each data based on feedback information transmitted from the mobile station apparatus. Spatial multiplexing control unit 36 determines the number of spatially multiplexed sequences in the transmission signal based on the information on the number of spatially multiplexed sequences in the transmission signal transmitted from the mobile station apparatus and information on the traffic status of the own base station apparatus. The transmission signal preprocessing control unit 35 uses the transmission signal preprocessing information transmitted from the mobile station apparatus to determine preprocessing to be performed on the transmission data, and notifies the mobile station apparatus of the used transmission signal preprocessing. In order to do so, the information is also generated.
The transmission information control unit 27 uses the control information input from the upper layer and the control information input from the data extraction unit 23 to use the scheduler unit 25, the modulation code control unit 31, the frequency selection scheduler unit 33, The operations of the processing control unit 35 and the spatial multiplexing control unit 36 are controlled. Each piece of output information is managed, and control information necessary for the operation of the data control unit 1, the modulation encoding unit 3, the transmission signal preprocessing unit 4, and the mapping unit 5 is output.
The radio reception unit 15 performs analog / digital conversion on the SC-FDMA signal received by the antenna 28, down-converts the signal into a baseband signal, and outputs the baseband signal to the fast Fourier transform (FFT) unit 17. The fast Fourier transform unit 17 subjects the received signal to Fourier transform for each processing time unit and outputs the result to the inverse discrete Fourier transform unit 21. The inverse discrete Fourier transform unit 21 divides the input signal into bands assigned for each mobile station device, performs inverse Fourier transform processing, and outputs a signal obtained by reproducing the SC-FDMA signal to the demodulation and decoding unit 22.
The demodulating / decoding unit 22 demodulates and decodes the input signal for each mobile station apparatus, and outputs the demodulated signal to the data extracting unit 23. The data extraction unit 23 divides and outputs the input signal from the demodulation / decoding unit 22 into information necessary for generating control information in the transmission information control unit 27, reception data, and control data necessary in the upper layer.
On the other hand, as shown in FIG. 2, the mobile station apparatus includes a data control unit 41, a modulation and coding unit 43, a discrete Fourier transform (DFT) unit 44, a mapping unit 45, an inverse fast Fourier transform (IFFT) unit 47, and radio transmission. Unit 51, radio reception unit 53, fast Fourier transform (FFT) unit 55, demodulation / decoding unit 57, data extraction unit 61, reception quality information control unit 65, and antenna 63. The feedback information control unit 65 includes a reception quality information generation unit 67, a reception quality measurement unit 71, a transmission signal preprocessing information generation unit 68, and a spatial multiplexing information generation unit 69. The antenna 63 includes a plurality of antennas necessary for MIMO / SDM communication.
The data control unit 41 receives transmission data transmitted to the base station apparatus, control data, and feedback information output from the feedback information control unit 65, and each data is sequentially transmitted to the base station apparatus. Is done.
The modulation encoding unit 43 performs modulation processing and error correction encoding processing on the signal input from the data control unit 41, and outputs each data to the discrete Fourier transform unit 44. Discrete Fourier transform unit 44 performs a Fourier transform process on the signal input from modulation encoding unit 43, generates a signal for performing SC-FDMA, and outputs the signal to mapping unit 45. The mapping unit 45 maps the data input from the discrete Fourier transform unit 44 to the frequency resource allocated by the base station apparatus, and outputs it to the inverse fast Fourier transform unit 47.
The inverse fast Fourier transform unit 47 performs an inverse fast Fourier transform process on the symbol sequence input from the mapping unit 45, converts it to a time-series baseband digital signal, and outputs the time-series baseband digital signal to the radio transmission unit 51. The output signal from the inverse fast Fourier transform unit 47 is digital / analog converted in the radio transmission unit 51, up-converted to a frequency suitable for transmission, and then transmitted to the base station apparatus via the antenna.
The reception quality measuring unit 71 measures the reception quality using the reference signal transmitted from the base station apparatus. The reception quality information generation unit 67 generates reception quality information to be transmitted to the base station apparatus based on the information measured by the reception quality measurement unit 71. The transmission signal preprocessing information generation unit 68 generates preprocessing information for a transmission signal performed by the base station apparatus, from propagation path information between the base station apparatuses. The spatial multiplexing information generating unit 69 calculates propagation path information using a signal received from the base station apparatus, and manages the number of transmission sequences that can communicate with the base station apparatus in MIMO / SM.
The feedback information control unit 65 manages control signals generated by the reception quality information generation unit 67, the transmission signal preprocessing information generation unit 68, and the spatial multiplexing information generation unit 69, and outputs them to the data control unit 41. The feedback information managed by the feedback information control unit 65 is not limited to the generation and control of the signals described herein, and may include a part for managing other types of feedback information.
FIG. 3 is a sequence diagram (300) showing a flow of processing between the base station apparatus and the mobile station apparatus in the mobile communication system according to the present embodiment, and transmission and reception between the mobile station apparatus and the base station apparatus in each subframe. A table (301) indicating transmission signal preprocessing information to be transmitted, and a table (302) indicating a status of application of transmission signal sequence number information to transmission signal preprocessing sequence confirmation information in each subframe. Feedback of reception quality information and transmission signal preprocessing information according to the present embodiment is performed in two modes of FIGS. 13 and 14 that are set simultaneously.
FIG. 13 shows a feedback mode in which PUCCH selects wideband reception quality information and transmission signal preprocessing information, one subband for each subband group, and transmits one reception quality information and transmission signal preprocessing information. It is. Each reception quality information and transmission signal preprocessing information are transmitted in different subframes. In the present embodiment, this is referred to as mode 1.
FIG. 14 shows a mode in which reception quality information and transmission signal preprocessing information corresponding to all subbands are simultaneously transmitted in one subframe using PUSCH. In the present embodiment, this is referred to as mode 2.
In a situation where these two feedback modes are used simultaneously, when a downlink signal with transmission signal preprocessing sequence confirmation information is transmitted and received, the transmission signal preprocessing information indicated by the transmission signal preprocessing sequence confirmation information is the mode. It is a feature of this embodiment that only those transmitted in 2 are targeted. However, the mode to be targeted is determined by the base station apparatus, which may be notified to the mobile station apparatus, or may be determined in advance according to the specifications.
Here, with respect to the downlink signal between the mobile station apparatus and the base station apparatus, in the time range shown in the present embodiment, spatial multiplexing by the MIMO / SM scheme that requires preprocessing of the transmission signal is performed. It shall be. Further, as information indicating a sequence of transmission signal preprocessing applied to the downlink signal, (1) transmission signal preprocessing sequence confirmation information indicating that the latest transmission signal preprocessing information notified in mode 2 is used. Or (2) one transmission signal preprocessing information applied to the entire allocated resource is surely notified to the mobile station apparatus as a downlink control signal.
Next, it is applied to the operation of notifying the reception quality information and the transmission signal preprocessing information from the mobile station apparatus to the base station apparatus in each subframe in FIG. 3 and the transmission signal preprocessing sequence confirmation information corresponding thereto. Processing of transmission signal preprocessing information will be described. In subframes 1 and 13, one reception quality information and transmission signal preprocessing information are transmitted to all subbands in mode 1 (351, 359). In subframes 4, 7, 10, and 16, the reception quality information and transmission signal preprocessing information for the subband selected by the mobile station apparatus from each subband group, and the position of the subband to which it is targeted. Representing information (3, 6, 7, 4) is transmitted (352, 354, 357, 360).
On the other hand, feedback using mode 2 is performed in subframe 8. Here, feedback of aperiodic reception quality information and transmission signal preprocessing information is performed, and reception quality information and transmission signal preprocessing information are transmitted to subbands 3 to 8, respectively (355). ). In the present embodiment, transmission signal preprocessing sequence confirmation information is only for transmission signal preprocessing information transmitted in mode 2, and transmission signal preprocessing sequence confirmation information notified together with the downlink in subframe 8 and thereafter. Corresponds to the subband transmission signal preprocessing information notified in 355 (see reference numeral 302 in the right figure). This may be discarded after a certain period, that is, the application of transmission signal preprocessing sequence confirmation information may be invalidated, or may be overwritten by the subsequent feedback in mode 2.
Next, the operation in the case where a downlink signal is transmitted from the base station apparatus to the mobile station apparatus in subframes 5, 9, and 12 will be described. When the downlink signal is transmitted in the subframe 5, at this time, the feedback of the reception quality information and the transmission signal preprocessing information in the mode 2 that is the target of the transmission signal preprocessing sequence confirmation information is not performed. For this reason, information of preprocessing applied to all allocated resources is added to the downlink control signal and transmitted (353). In subframe 9, a downlink signal is transmitted, and transmission signal preprocessing sequence confirmation information is added thereto. In this case, the mobile station apparatus determines that the downlink signal has been preprocessed using the transmission signal preprocessing information transmitted in subframe 8, and uses this to demodulate the received signal. A subframe 12 represents a case where only subband 7 is allocated and downlink data is transmitted. At this time, it is desirable that the base station apparatus uses reception quality information and transmission signal preprocessing information for subband 7 notified in subframe 10. Therefore, the base station apparatus explicitly includes the transmission signal preprocessing information obtained in the subframe 10 in the downlink control information and transmits it to the mobile station apparatus (358).
As described above, when feeding back reception quality information and transmission signal preprocessing information in a situation where a plurality of modes are set simultaneously, by limiting the mode to which the transmission signal preprocessing sequence confirmation information corresponds, to which subband On the other hand, there is an advantage that it becomes easy to manage which transmission signal preprocessing information is used.
FIG. 4 is a sequence diagram (400) for explaining the flow of processing between the base station apparatus and the mobile station apparatus of the mobile communication system according to the present embodiment. In each subframe, the mobile station apparatus and the base station apparatus It is the table (401) which shows the transmission signal pre-processing information transmitted / received, and the table (402) which shows the application condition to the transmission signal pre-processing sequence confirmation information of the transmission signal sequence number information in each sub-frame. Assume that the transmission modes of the reception quality information and transmission signal preprocessing information set in the present embodiment are set simultaneously as shown in FIGS.
FIG. 5 shows a feedback mode in which wideband reception quality information and transmission signal preprocessing information are transmitted in PUCCH. In the present embodiment, this is referred to as mode 3.
FIG. 6 shows all the wideband reception quality information and transmission signal preprocessing information, and one reception quality information and transmission signal preprocessing information applied to a plurality of subbands selected by the mobile station apparatus by PUSCH. This is the feedback mode to send. In this mode, information indicating the location of the subband selected by the mobile station apparatus is also transmitted simultaneously. Moreover, transmission of all these pieces of information is completed once in one subframe. In the present embodiment, this is referred to as mode 4.
In a situation where these two feedback modes are used simultaneously, when a downlink signal with transmission signal preprocessing sequence confirmation information is transmitted and received, the transmission signal preprocessing information indicated by the transmission signal preprocessing sequence confirmation information is the mode. It is a feature of the present embodiment that only those transmitted in 4 are targeted. Here, the decision as to which mode is the target is made by the base station apparatus, which may be notified to the mobile station apparatus, or may be determined in advance according to the specifications.
Further, in this embodiment, it is assumed that spatial multiplexing by the MIMO / SM scheme is performed on the downlink signal between the mobile station apparatus and the base station apparatus. Further, as information indicating a sequence of transmission signal preprocessing applied to the downlink signal, (1) transmission signal preprocessing sequence confirmation information indicating that the latest transmission signal preprocessing information notified in the mode 4 is used. Alternatively, (2) one transmission signal preprocessing information applied to the entire allocated resource is always notified to the mobile station apparatus as a downlink control signal.
Next, the operation of notifying the reception quality information and the transmission signal preprocessing information from the mobile station apparatus to the base station apparatus in each subframe in FIG. 4 will be described. In subframes 1 and 13, in mode 3, one reception quality information and transmission signal preprocessing information are transmitted for all subbands (451, 456). On the other hand, feedback using mode 4 is performed in subframe 8. Here, feedback of aperiodic reception quality information and transmission signal preprocessing information is performed, reception quality information and transmission signal preprocessing information applied to subbands 4 and 5, and subbands 3 to 8 Wideband reception quality information and transmission signal preprocessing information applicable to all are transmitted (453).
In the present embodiment, transmission signal preprocessing sequence confirmation information is only for transmission signal preprocessing information transmitted in mode 4, and transmission signal preprocessing sequence confirmation information notified together with the downlink in subframe 8 and thereafter. Matches the transmission signal preprocessing information notified at 453 (402).
The effective period for which the transmission signal preprocessing information transmitted in mode 4 is the target of transmission signal preprocessing sequence confirmation information is limited to a certain period from the transmission / reception timing, that is, transmission signal preprocessing sequence confirmation information. May be overridden, or may be overwritten by the feedback in the next mode 4.
Next, an operation when a downlink signal is transmitted from the base station apparatus to the mobile station apparatus in subframes 5, 9, and 12 will be described. When a downlink signal is transmitted in subframe 5, at this time point, feedback of reception quality information and transmission signal preprocessing information in mode 2 that is a target of transmission signal preprocessing sequence confirmation information is not performed. Therefore, information on preprocessing applied to all allocated resources is added to the downlink control signal and transmitted (452). In subframe 9, a downlink signal is transmitted, and transmission signal preprocessing sequence confirmation information is added thereto. In this case, the mobile station apparatus determines that the downlink signal has been preprocessed using the transmission signal preprocessing information transmitted in subframe 8, and uses the transmission signal preprocessing information held as indicated by 402. Then, the received signal is demodulated. A subframe 12 represents a case in which subband 7 is allocated and downlink data is transmitted. At this time, the base station apparatus preferably uses the reception quality information and transmission signal preprocessing information for subband 7 notified in subframe 8. Therefore, the base station apparatus explicitly includes the transmission signal preprocessing information obtained in the subframe 8 in the downlink control information and transmits it to the mobile station apparatus (455).
As described above, when receiving quality information and transmission signal preprocessing information are fed back in a situation where a plurality of modes are set simultaneously, by limiting the modes to which the transmission signal preprocessing sequence confirmation information corresponds, to which subband It becomes easy to manage which transmission signal preprocessing information is used.
FIG. 7 is a sequence diagram (700) for explaining the flow of processing between the base station apparatus and mobile station apparatus of the mobile communication system according to the present embodiment, and the mobile station apparatus and base station apparatus in each subframe. FIG. 7 is a diagram showing a table (701) indicating transmission signal pre-processing information transmitted / received in FIG. 5 and a table (702) indicating the application status of transmission signal sequence number information in each subframe to transmission signal pre-processing sequence confirmation information. . Feedback of reception quality information and transmission signal preprocessing information in the present embodiment is performed in two modes shown in FIGS. 8 and 9 that are set simultaneously.
FIG. 8 shows all of the wideband reception quality information and transmission signal preprocessing information, and one reception quality information and transmission signal preprocessing information applied to a plurality of subbands selected by the mobile station apparatus using PUSCH. This is the feedback mode to send. In this mode, information indicating the location of the subband selected by the mobile station apparatus is also transmitted simultaneously. Further, transmission of all these information is completed once in one subframe. In the present embodiment, this is referred to as mode 5.
FIG. 9 shows a mode in which reception quality information and transmission signal preprocessing information corresponding to all subbands are simultaneously transmitted in one subframe using PUSCH. In the present embodiment, this is called mode 6 (this is the same as mode 2 in the first embodiment).
When these two modes are used simultaneously, when a downlink signal with transmission signal preprocessing sequence confirmation information is transmitted / received, only transmission signal preprocessing information transmitted in mode 6 may be targeted. This is a feature of the present embodiment. Here, the base station apparatus determines which mode is the target, and may notify this to the mobile station apparatus, or may be determined in advance according to specifications or the like.
In this embodiment, it is assumed that spatial multiplexing by the MIMO / SM scheme is performed on the downlink signal between the mobile station apparatus and the base station apparatus. Further, as information indicating a sequence of transmission signal preprocessing applied to the downlink signal, (1) transmission signal preprocessing sequence confirmation information indicating that the latest transmission signal preprocessing information notified in the mode 6 is used. Or, (2) one transmission signal preprocessing information applied to the entire allocated resource is always notified to the mobile station apparatus as a downlink control signal.
Next, the operation of notifying the reception quality information and the transmission signal preprocessing information from the mobile station apparatus to the base station apparatus in each subframe in FIG. 7 will be described. In subframe 1, mode 5 allows one reception quality information and transmission signal preprocessing information applied to subbands 4 and 5 selected by the base station apparatus, and wide band applicable to all subbands 3 to 8. Band reception quality information and transmission signal preprocessing information are transmitted (751). The operation in the subframe 13 is the same (756). On the other hand, feedback using mode 6 is performed in subframe 8. Here, feedback of aperiodic reception quality information and transmission signal preprocessing information is performed, and each reception quality information and transmission signal preprocessing information corresponding to each subband is transmitted (753). In the present embodiment, transmission signal preprocessing sequence confirmation information is only for transmission signal preprocessing information transmitted in mode 6, and transmission signal preprocessing sequence confirmation information that is notified together with the downlink in subframe 8 and thereafter. Matches the transmission signal preprocessing information notified in 753 (702). This may be discarded after a certain period of time, that is, the application of transmission signal preprocessing sequence confirmation information may be disabled, or may be overwritten by feedback in the next mode 6 .
Next, when downlink signals are transmitted from the base station apparatus to the mobile station apparatus in subframes 5 and 9, the operation will be described. At the time when the transmission of the downlink signal is performed in the subframe 5, the reception quality information and the transmission signal preprocessing information in the mode 2 that is the target of the transmission signal preprocessing sequence confirmation information are not fed back. For this reason, information explicitly indicating a preprocessing sequence applied to all allocated resources is added to the downlink control signal and transmitted (752).
In subframe 9, a downlink signal is transmitted, and transmission signal preprocessing sequence confirmation information is added thereto. In this case, the mobile station apparatus determines that the downlink signal has been preprocessed using the transmission signal preprocessing information transmitted in subframe 8, and uses the transmission signal preprocessing information held as indicated by 702. Then, the received signal is demodulated.
FIG. 10 is a sequence diagram (1000) for explaining the flow of processing between the base station apparatus and mobile station apparatus of the mobile communication system according to the present embodiment, and the mobile station apparatus and base station apparatus in each subframe. The table (1001) which shows the transmission signal pre-processing information transmitted / received by 1 and the table (1002, 1003) which shows the application condition to the transmission signal pre-processing sequence confirmation information of the transmission signal sequence number information in each subframe It is. Feedback of reception quality information and transmission signal preprocessing information in the present embodiment is performed in two modes shown in FIGS. 13 and 14 that are set simultaneously. These modes are the same as modes 1 and 2 of the first embodiment of the present invention, and feedback of reception quality information and transmission signal preprocessing information in modes 1 and 2 is performed.
When these two modes are used at the same time, when a downlink signal with transmission signal preprocessing sequence confirmation information is transmitted and received, the transmission signal transmitted in which mode is included in the transmission signal preprocessing sequence confirmation information. A feature of the present embodiment is that information indicating whether preprocessing information is targeted is included.
In the present embodiment, it is assumed that information for identifying mode 1 and mode 2 is included. Which mode this information corresponds to may be determined in advance according to specifications or the like, or may be dynamically set from the base station apparatus to the mobile station apparatus. Further, in this embodiment, it is assumed that spatial multiplexing by the MIMO / SM scheme is performed for the downlink signal between the mobile station apparatus and the base station apparatus. Further, as information indicating a sequence of transmission signal preprocessing applied to the downlink signal, (1) transmission signal preprocessing indicating that the latest transmission signal preprocessing information notified in mode 1 or mode 2 is used. Either the sequence confirmation information or (2) one transmission signal preprocessing information applied to the entire allocated resource is always notified to the mobile station apparatus as a downlink control signal.
The operation of notifying the reception quality information and the transmission signal preprocessing information from the mobile station apparatus to the base station apparatus in each subframe in FIG. 10 is the same as that in the first embodiment (1051, 1052, 1054, 1055). 1057, 1059, 1060). In the present embodiment, the transmission signal preprocessing sequence confirmation information is targeted for both transmission signal preprocessing information transmitted in mode 1 and mode 2. That is, when “mode 1” is designated in the transmission signal preprocessing sequence confirmation information, the transmission signal preprocessing information (1051, 1052, 1054, 1057, 1059, 1060) transmitted in mode 1 is transmitted before the transmission signal. Applied to processing sequence confirmation information (1002). When “mode 2” is designated in the transmission signal preprocessing sequence confirmation information, the transmission signal preprocessing information (1055) transmitted in mode 2 is applied to the transmission signal preprocessing sequence confirmation information (1003). ). This may be discarded after a certain period of time, that is, the application of transmission signal preprocessing sequence confirmation information may be invalidated or overwritten by the next feedback in the same mode. .
Next, the operation when downlink signals are transmitted from the base station apparatus to the mobile station apparatus in subframes 5, 9, and 12 will be described.
In subframe 5, downlink signals are transmitted using resources belonging to subbands 3 and 4. Here, transmission signal preprocessing sequence confirmation information designating mode 1 is added to the downlink control signal and transmitted (1053). At this time, the base station apparatus performs preprocessing using the transmission signal preprocessing information of subband 3 transmitted in 1052 for subband 3 and the wideband transmission signal preprocessing signal for subband 4, respectively. The device processes the received signal as they are applied.
In subframe 9, downlink signals are transmitted using resources belonging to subbands 4 and 5. Here, transmission signal preprocessing sequence confirmation information designating mode 2 is added to the downlink control signal and transmitted (1056). At this time, the base station apparatus performs preprocessing using each transmission signal preprocessing information transmitted at 1052 for each subband, and the mobile station apparatus processes the received signal assuming that these are applied. .
The subframe 12 shows an example in which a downlink signal is transmitted using resources belonging to the subbands 6 and 7. Here, one transmission signal preprocessing sequence information applied to the allocated resource is added to the downlink control signal and transmitted (1058). At this time, the preprocessing performed in the base station apparatus applies the transmission signal preprocessing signal applied by the base station apparatus regardless of the subband to which the resource belongs or past feedback, and the mobile station apparatus together with the downlink signal The received signal is processed using the transmitted signal preprocessing information to be transmitted.
FIG. 12 is a sequence diagram for explaining the flow of processing between the base station apparatus and mobile station apparatus of the mobile communication system according to the present embodiment, and a transmission signal of transmission signal sequence number information in each subframe. It is a figure which shows the table (1210) which shows the application condition to pre-processing series confirmation information. This figure explains what reference (priority) the plurality of transmission signal sequence number information transmitted from the mobile station apparatus is applied to the transmission signal preprocessing sequence confirmation information. Feedback of reception quality information and transmission signal preprocessing information in the present embodiment is performed in two modes of FIGS. 13 and 14 that are set simultaneously. These modes are the same as those in the first embodiment of the present invention, and feedback of reception quality information and transmission signal preprocessing information in modes 1 and 2 is performed.
The difference from the first embodiment is that the wideband transmission signal preprocessing information is not applied by overwriting the subband transmission signal preprocessing information. That is, the subband transmission signal preprocessing information is not applied to the wideband transmission signal preprocessing information. It is always a priority. Specifically, it corresponds to the operations of subframes 13 and 16. In the subframe 13, the wideband transmission signal preprocessing information transmitted here cannot be overwritten with the subband transmission signal preprocessing information held so far (1206). In this case, when new subband transmission signal preprocessing information for the same subband is not transmitted / received, old subband transmission signal preprocessing information is retained semipermanently. Since optimum transmission signal preprocessing information and reception quality information change depending on the propagation path, it is not desirable from the aspect of characteristics of the downlink signal that information remains for a long time. In order to cope with this, the mobile station apparatus and the base station apparatus delete the subband transmission signal preprocessing information at a predetermined timing. Here, in subframe 16, all the subband transmission signal preprocessing information transmitted in subframe 8 is first erased. Subband transmission signal preprocessing information remaining at this time remains only for subband 7 received in subframe 10 and for subband 4 newly received in subframe 16. Therefore, the wideband transmission signal preprocessing information received in the subframe 13 is applied to the other subbands (1207).
The band to which the transmission signal preprocessing information corresponding to the transmission signal preprocessing sequence confirmation information is applied when the reception quality information and the transmission signal preprocessing information are fed back in a situation where a plurality of modes are set simultaneously by the above processing. By assigning priorities according to the size of each sub-band, it becomes easy to manage which transmission signal pre-processing information is used for which sub-band. Further, since feedback information that is no longer suitable for the channel condition is invalidated for a certain period as time elapses from feedback, characteristic deterioration due to use of this information can be avoided. Note that the time for invalidation may be determined in advance according to specifications or the like, or may be calculated from the period of its own feedback mode or the period of another feedback mode set at the same time. Further, this time may be explicitly notified from the base station apparatus.
FIG. 15 is a sequence diagram for explaining the flow of processing between the base station apparatus and the mobile station apparatus of the mobile communication system according to the present embodiment, and the transmission signal sequence number information before each transmission signal in each subframe. The table (1510) which shows the application condition to process sequence confirmation information is represented. This figure explains what reference (priority) the plurality of transmission signal sequence number information transmitted from the mobile station apparatus is applied to the transmission signal preprocessing sequence confirmation information. Feedback of reception quality information and transmission signal preprocessing information in this embodiment is performed in the two modes of FIGS. 13 and 14 that are set simultaneously. These modes are the same as in the fifth embodiment of the present invention, and feedback of reception quality information and transmission signal preprocessing information in modes 1 and 2 is performed.
The difference from the fifth embodiment is that transmission signal preprocessing information fed back in mode 1 cannot be overwritten with transmission signal preprocessing information fed back in mode 2. Specifically, this is the operation of subframe 10, and the subband transmission signal preprocessing information transmitted here cannot overwrite the already applied mode 2 subband transmission signal preprocessing information (1505). That is, even if the bandwidth to which the transmission signal preprocessing information is applied is the same, the priority is determined depending on the mode regardless of before and after the transmission / reception timing. Has priority. In this case, when new mode 2 subband transmission signal preprocessing information is not transmitted and received, the old subband transmission signal preprocessing information is retained semipermanently. Since the optimum transmission signal preprocessing information and reception quality information change depending on the propagation path, it is not desirable from the aspect of the characteristics of the downlink signal that the information depending on the propagation path remains for a long time. On the other hand, the mobile station device and the base station device delete the subband transmission signal preprocessing information at a predetermined timing. Here, in subframe 16, all the subband transmission signal preprocessing information transmitted in subframe 8 is first erased. Then, the subband transmission signal preprocessing information for subband 7 received in subframes 10 and 13 and the wideband transmission signal preprocessing information received in subframe 13 are applied and newly received in subframe 16 ( 1507).
According to the above, when feeding back reception quality information and transmission signal preprocessing information in a situation where a plurality of modes are set at the same time, the priority order according to the mode to which the transmission signal preprocessing sequence confirmation information corresponds is given, It becomes easy to manage which transmission signal preprocessing information is used for the subband. Further, since feedback information that is no longer suitable for the channel condition is invalidated for a certain period as time elapses from feedback, characteristic deterioration due to use of this information can be avoided. The time for invalidation may be determined in advance according to specifications, etc., or may use a period set for itself or another periodic feedback mode, and can be uniquely calculated from this period. You may use things. Further, this time may be explicitly notified from the base station apparatus.
FIG. 16 is a sequence diagram for explaining the flow of processing between the base station apparatus and the mobile station apparatus of the mobile communication system according to the present embodiment, and the transmission signal sequence number information before each transmission signal in each subframe. The table (1610) which shows the application condition to process sequence confirmation information is represented. This figure explains what reference (priority) the plurality of transmission signal sequence number information transmitted from the mobile station apparatus is applied to the transmission signal preprocessing sequence confirmation information. In the present embodiment, the reception quality information and the transmission signal pre-processing information are fed back by the method of mode 1 shown in FIG.
The difference from the sixth embodiment is that the application of single transmission signal preprocessing information in mode 1 is described. Specifically, the operations of subframes 13, 16, and 19 are characteristic. In subframe 13, wideband reception quality information and transmission signal preprocessing information are received. If this is applied to all subbands, subband transmission for subband 8 received in immediately preceding subframe 7 is applied. The signal preprocessing information is also overwritten. Since this operation is inefficient, no overwrite is applied to the subbands in the subframe 13 (1605). That is, the subband transmission signal preprocessing information has a higher priority than the wideband transmission signal preprocessing information. When feedback for subband group A is performed in subframe 16, all transmission signal preprocessing information for subband group A is updated (1606).
Specifically, in the subband 4 where the subband transmission signal preprocessing information is transmitted, the transmitted transmission signal preprocessing information is applied, and the other subband (3) is transmitted in the subframe 10. Apply wideband transmission signal preprocessing information. This operation is the same for the subframe 19 (1606).
As described above, when the frequency domain to be fed back is temporally divided and the reception quality information and the transmission signal preprocessing information are fed back, the frequency domain is applied at the timing when the feedback is performed for each divided frequency region. In this way, it is possible to prevent the wideband transmission signal preprocessing information from being overwritten and applied immediately after feedback.
FIG. 17 is a sequence diagram for explaining the flow of processing between the base station apparatus and the mobile station apparatus of the mobile communication system according to the present embodiment, and a transmission signal of transmission signal sequence number information in each subframe. It is a figure which shows the table (1710) which shows the application condition to pre-processing series confirmation information. This figure explains what reference (priority) the plurality of transmission signal sequence number information transmitted from the mobile station apparatus is applied to the transmission signal preprocessing sequence confirmation information. The feedback of reception quality information and transmission signal preprocessing information in this embodiment is performed by feedback of reception quality information and transmission signal preprocessing information by the method of mode 1 shown in FIG.
The difference from the seventh embodiment is that the application of single transmission signal preprocessing information in mode 1 is described. Specifically, the operation of the subframe 13 is characteristic. In subframe 13, wideband reception quality information and transmission signal preprocessing information are received. When this is applied to all subbands, the subband transmission signal for subband 8 received in immediately preceding subframe 7 is applied. Pre-processing information is also overwritten. In addition, it is unlikely that this information cannot be applied in each subband group until the next feedback is given.
Therefore, in the subframe 13, overwriting is applied only to the subband to which the wideband transmission signal preprocessing information is applied. Specifically, for subbands 4, 5, and 7, the wideband transmission signal preprocessing information fed back in subframe 1 is updated to the wideband transmission signal preprocessing information fed back in subframe 13 (1705). ). That is, the subband transmission signal preprocessing information has a higher priority than the wideband transmission signal preprocessing information.
As described above, when the frequency domain to be fed back is temporally divided and the reception quality information and the transmission signal preprocessing information are fed back, application is performed for each divided frequency region at the timing when the feedback is performed on the region. Thus, it is possible to prevent the wideband transmission signal preprocessing information from being overwritten and applied immediately after the feedback.
As mentioned above, although each embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiment, and the design and the like within the scope not departing from the gist of the present invention are also patented. Included in the claims.
In a mobile communication system including a base station device and a mobile station device,
The mobile station apparatus transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station apparatus based on one of a plurality of types of feedback schemes that can be set simultaneously,
The base station apparatus includes a preprocessed downlink signal and transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing, the transmission signal preprocessing sequence confirmation information represented by the transmission signal preprocessing sequence confirmation information. The processing information is transmitted to the mobile station apparatus as transmission signal pre-processing sequence confirmation information corresponding to information transmitted by a part of the plurality of types of feedback schemes. .
A mobile station apparatus in a mobile communication system including a base station apparatus and a mobile station apparatus,
The base station apparatus receives a preprocessed downlink signal and transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing, and is represented by the transmission signal preprocessing sequence confirmation information The mobile station apparatus, wherein the signal preprocessing information demodulates the downlink signal corresponding to information transmitted by a part of the plurality of types of feedback systems.
A base station apparatus in a mobile communication system including a base station apparatus and a mobile station apparatus,
Feedback information including transmission signal pre-processing information indicating information for pre-processing the transmission signal, the feedback information transmitted by the mobile station apparatus based on any of a plurality of types of feedback schemes that can be set simultaneously, A downlink signal subjected to preprocessing and transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing, wherein the transmission signal preprocessing information represented by the transmission signal preprocessing sequence confirmation information includes A base station apparatus, wherein transmission signal pre-processing sequence confirmation information corresponding to a part of the types of feedback systems transmitted is transmitted to the mobile station apparatus.
The mobile communication system according to claim 1, wherein a signal designating the system is notified from the mobile station apparatus to the base station apparatus with respect to the partial system.
The mobile station apparatus according to claim 2, wherein a signal designating the system is notified from the mobile station apparatus to the base station apparatus with respect to the partial scheme.
Wherein the portion of the system, the base station apparatus according to claim 3, characterized in that a signal specifying the scheme is reported from the mobile station apparatus to the base station apparatus.
A communication method in a mobile communication system including a base station device and a mobile station device,
The mobile station device transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station device based on any of a plurality of types of feedback schemes that can be set simultaneously;
The base station apparatus performs pre-processing downlink signals and transmission signal pre-processing sequence confirmation information indicating a sequence used for the pre-processing, and the transmission signal pre-processing sequence confirmation information represented by the transmission signal pre-processing sequence confirmation information The processing information includes a step of transmitting to the mobile station apparatus transmission signal pre-processing sequence confirmation information corresponding to what is transmitted by a part of the plurality of types of feedback schemes. Mobile communication method.
The mobile station apparatus transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station apparatus based on a plurality of types of feedback schemes that can be set simultaneously.
The base station apparatus preprocesses a downlink signal and transmits it to the mobile station apparatus, and transmits transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing to the mobile station apparatus together with the downlink signal. Send
The mobile communication system, wherein the transmission signal preprocessing sequence confirmation information includes information indicating which of the plurality of feedback methods corresponds to transmission signal preprocessing information transmitted.
Sending feedback information including transmission signal preprocessing information indicating information for preprocessing the transmission signal to the base station apparatus based on a plurality of types of feedback schemes that can be set simultaneously,
From the base station apparatus, the downlink signal is preprocessed and transmitted to the mobile station apparatus, and represents a sequence used for the preprocessing, and transmitted by any of the multiple feedback systems. A mobile station apparatus that receives transmission signal preprocessing sequence confirmation information including information indicating whether it corresponds to transmission signal preprocessing information together with a downlink signal.
The mobile station apparatus receives information transmitted based on a plurality of types of feedback schemes that can simultaneously set feedback information including transmission signal preprocessing information indicating information for preprocessing the transmission signal, and transmits the information to the downlink signal. Processed and transmitted to the mobile station apparatus, and transmission signal pre-processing sequence confirmation information representing a sequence used for the pre-processing, the transmission transmitted by any of the plurality of feedback methods A base station apparatus which transmits to a mobile station apparatus together with a downlink signal including information indicating whether it corresponds to signal preprocessing information.
The mobile station apparatus transmits to the base station apparatus based on a plurality of types of feedback schemes that can be simultaneously set feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal;
The base station apparatus preprocesses a downlink signal and transmits it to the mobile station apparatus, and transmits transmission signal preprocessing sequence confirmation information representing a sequence used for the preprocessing to the mobile station apparatus together with the downlink signal. The transmission signal pre-processing sequence confirmation information includes information indicating which of the plurality of feedback schemes corresponds to the transmission signal pre-processing information transmitted. Communication method.
The mobile station apparatus transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station apparatus, and the feedback information is transmitted based on a plurality of types of feedback schemes that can be set simultaneously. And
The base station apparatus preprocesses the downlink signal and transmits it to the mobile station apparatus, and transmits transmission signal preprocessing sequence confirmation information representing the sequence used for the preprocessing to the mobile station apparatus together with the downlink signal. ,
The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information includes time information transmitted or received from a plurality of transmission signal preprocessing information transmitted from the mobile station apparatus to the base station apparatus. A mobile communication system using the highest priority calculated using one or more of the difference between the feedback schemes and the frequency channel width corresponding to the transmission signal preprocessing information.
In the base station apparatus, the downlink signal is preprocessed and transmitted, and the transmission signal preprocessing sequence confirmation information representing the sequence used for the preprocessing is received along with the downlink signal, The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is transmitted or received time information from a plurality of transmission signal preprocessing information transmitted from the mobile station device to the base station device, and A mobile station apparatus adopting the highest priority calculated using one or more of the difference in the feedback scheme and the frequency channel width corresponding to the transmission signal preprocessing information.
The mobile station apparatus is feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal, and receives information transmitted based on a plurality of types of feedback schemes that can be set simultaneously,
The downlink signal is preprocessed and transmitted to the mobile station apparatus, and transmission signal preprocessing sequence confirmation information representing the sequence used for the preprocessing is transmitted to the mobile station apparatus together with the downlink signal. The sequence used for the preprocessing represented by the preprocessing sequence confirmation information includes time information transmitted or received from a plurality of transmission signal preprocessing information transmitted from the mobile station device to the base station device, and the feedback. A base station apparatus that employs a system having the highest priority calculated by using one or more frequency channels corresponding to a difference in system and transmission signal preprocessing information.
13. The mobile communication system according to claim 12, wherein the priority according to claim 12 is set to be lower as time elapses from the transmitted time.
The mobile station apparatus according to claim 13, wherein the priority according to claim 13 is set low as time elapses from the transmitted time.
The base station apparatus according to claim 14, wherein the priority according to claim 14 is set to be lower as time elapses from the transmitted time.
The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is released from correspondence after a lapse of a predetermined time from the time of transmission or reception. Mobile communication system.
The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is released from the correspondence after a predetermined time from the time of transmission or reception. Mobile station device.
The base station according to claim 14, wherein the sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is released from correspondence after a certain time from the time of transmission or reception. apparatus.
The mobile station apparatus transmits feedback information including transmission signal preprocessing information indicating information for preprocessing a transmission signal to the base station apparatus, and the feedback information is transmitted based on a plurality of types of feedback schemes that can be set simultaneously. Steps,
The base station apparatus preprocesses the downlink signal and transmits it to the mobile station apparatus, and transmits transmission signal preprocessing sequence confirmation information representing the sequence used for the preprocessing to the mobile station apparatus together with the downlink signal. The sequence used for the preprocessing represented by the transmission signal preprocessing sequence confirmation information is transmitted or received from the transmission signal preprocessing information transmitted from the mobile station apparatus to the base station apparatus. A mobile communication method, wherein a determination is made based on a priority using one of time, a difference in the feedback scheme, and a width of a frequency channel to which transmission signal preprocessing information is applied.
JP2010509207A 2008-04-25 2009-04-23 Mobile communication system, base station apparatus, mobile station apparatus, and mobile communication method Active JP4594451B2 (en)
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PCT/JP2009/058038 WO2009131163A1 (en) 2008-04-25 2009-04-23 Mobile communication system, base station device, mobile station device, and mobile communication method
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CN1969473B (en) * 2004-06-14 2011-02-09 三星电子株式会社 Device and method for controlling transfer mode in multi-input and multi-output mobile communication system
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