Source: http://patents.com/us-9071495.html
Timestamp: 2018-11-17 20:01:59
Document Index: 475166791

Matched Legal Cases: ['Application No. 06715568', 'Application No. 2007', 'Application No. 2007', 'art.\n2', 'art.\n5', 'art.\n9', 'art.\n12']

US Patent # 9,071,495. Integrated circuit for controlling radio transmission of ACK/NACK information - Patents.com
United States Patent 9,071,495
Miyoshi , et al. June 30, 2015
Integrated circuit for controlling radio transmission of ACK/NACK information
A radio receiver apparatus that can effectively utilize GI to improve the reception quality. In this apparatus, a data extracting part extracts a data portion of a direct wave from a signal subjected to a radio reception process by a received RF part. A GI extracting part extracts, from the signal subjected to the radio reception process by the received RF part, GI having a length determined by an extracted GI length deciding part. The extracted GI is adjusted by a data position adjusting part such that its rear end coincides with the read end of the extracted data portion. A combining part combines the extracted data portion with the GI the data position of which has been adjusted. The combined signal is then supplied to a frequency axis equalizing part, which equalizes the signal distortions of the combined signal on the frequency axis.
Miyoshi; Kenichi (Kanagawa, JP), Nishio; Akihiko (Osaka, JP), Iwai; Takashi (Iskikawa, JP), Futagi; Sadaki (Ishikawa, JP), Hiramatsu; Katsuhiko (Kanagawa, JP), Imamura; Daichi (Beijing, CN), Aramaki; Takashi (Osaka, JP)
Family ID: 1000001188357
13/948,027
US 20130301594 A1 Nov 14, 2013
13734604 Jan 4, 2013 8521108
11908093 Feb 5, 2013 8369806
PCT/JP2006/304798 Mar 10, 2006
Mar 10, 2005 [JP] 2005-066813
Jul 22, 2005 [JP] 2005-212671
Mar 9, 2006 [JP] 2006-063972
Current CPC Class: H04L 27/2666 (20130101); H04L 27/2607 (20130101); H04L 27/2647 (20130101); H04L 25/03159 (20130101); H04L 27/2646 (20130101); H04L 27/2662 (20130101)
Current International Class: H04L 27/26 (20060101); H04L 25/03 (20060101)
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1. An integrated circuit that controls transmission, in a single carrier transmission system, of a plurality of data symbols that are included in a data part and arranged between a front end and a rear end of the data part, the integrated circuit comprising: an arrangement control configured to command arrangement of the plurality of data symbols to map at least one data symbol including ACK/NACK information from the rear end of the data part; and a transmission control configured to command transmission, during a cyclic prefix period, of one or more data symbols including data that is the same as data included in a portion of the plurality of data symbols, the portion ranging from the rear end of the data part and corresponding to the cyclic prefix period to thereby contain said at least one data symbol including ACK/NACK information, the transmission control being further configured to command transmission of the plurality of data symbols in the data part after the cyclic prefix period, to thereby command transmission, during the cyclic prefix period, of said one or more data symbols including data that is the same as data included in the portion containing said at least one data symbol including ACK/NACK information, and to command transmission, during transmission of the portion, of said at least one data symbol including ACK/NACK information, such that the ACK/NACK information is transmitted twice within a combination including a data part and a cyclic prefix period that precedes the data part.
2. The integrated circuit of claim 1, wherein the cyclic prefix period comprises a guard interval.
3. The integrated circuit of claim 1, wherein the plurality of data symbols are OFDM data symbols.
4. The integrated circuit of claim 1, wherein the portion ranging from the rear end of the data part has improved error rate characteristics than the rest of the data part.
5. The integrated circuit of claim 1, wherein the arrangement control is further configured to map at least one data symbol including significant information other than the ACK/NACK information in said portion ranging from the rear end of the data part, such that said significant information is transmitted twice, both during the cyclic prefix period and during transmission of said portion.
6. The integrated circuit of claim 5, wherein the significant information is one or more of a control channel, systematic bits, retransmission bits, CQI (channel quality indicator), TFCI (transport format combination indicator), information required for decoding, pilot bits, and power control bits.
7. The integrated circuit of claim 1, further comprising a modulation control configured to command modulation of the plurality of data symbols.
8. An integrated circuit that controls transmission, in a single carrier transmission system, of a plurality of data symbols that are included in a data part and arranged between a front end and a rear end of the data part, the integrated circuit comprising: an arrangement module configured to control arrangement of the plurality of data symbols to map at least one data symbol including ACK/NACK information from the rear end of the data part; and a transmission module configured to control transmission, during a cyclic prefix period, of one or more data symbols including data that is the same as data included in a portion of the plurality of data symbols, the portion ranging from the rear end of the data part and corresponding to the cyclic prefix period to thereby contain said at least one data symbol including ACK/NACK information, the transmission control being further configured to command transmission of the plurality of data symbols in the data part after the cyclic prefix period, wherein the ACK/NACK information is transmitted twice, both during the cyclic prefix period and during transmission of the portion ranging from the rear end of the data part.
9. The integrated circuit of claim 8, wherein the cyclic prefix period comprises a guard interval.
10. The integrated circuit of claim 8, wherein the plurality of data symbols are OFDM data symbols.
11. The integrated circuit of claim 8, wherein the portion ranging from the rear end of the data part has improved error rate characteristics than the rest of the data part.
12. The integrated circuit of claim 8, wherein the arrangement control is further configured to map at least one data symbol including significant information other than the ACK/NACK information in said portion ranging from the rear end of the data part, such that said significant information is transmitted twice, both during the cyclic prefix period and during transmission of said portion.
13. The integrated circuit of claim 12, wherein the significant information is one or more of a control channel, systematic bits, retransmission bits, CQI (channel quality indicator), TFCI (transport format combination indicator), information required for decoding, pilot bits, and power control bits.
14. The integrated circuit of claim 8, further comprising a modulation control configured to command modulation of the plurality of data symbols.
The art disclosed in Patent Document 1 relates to the above frequency equalization single-carrier transmission systems. This art will be briefly described below. As shown in FIG. 1, the transmission system disclosed in Patent Document 1 generates signals in which a predetermined portion of the rear part of transmission data (data part in the drawing) is attached to the head of the data part as a guard interval (hereinafter abbreviated as "GI"). The signals generated are then transmitted from the transmitting apparatus, and signals combining direct waves and delayed waves arrive at the receiving apparatus. At the receiving apparatus, as shown in FIG. 2, a timing synchronization process is performed for the received data, and signals of the length of the data part are extracted from the beginning of the data part of the direct wave. The extracted signals thereby include the direct wave component, the delayed wave component and the noise component from the receiving apparatus, and the extracted signals combine all of these components. Then, the extracted signals are subjected to signal distortion correction process in the frequency domain (frequency domain equalization) and demodulated.
A GI is also called a cyclic prefix ("CP").
Based on the timing outputted from direct wave timing detecting section 103, data extracting section 104 extracts the signal having a length of T.sub.DATA from the beginning of the data part of the direct wave of the signal outputted from RF receiving section 102, and outputs the extracted signal to combining section 109.
Maximum delay time detecting section 105 detects the maximum time of the delayed wave (the maximum delay time .tau.max) from the signal outputted from RF receiving section 102, and outputs the detected maximum delay time .tau.max to extracted GI length determining section 106.
Extracted GI length determining section 106 obtains T.sub.GI, which indicates the length of the GI in the received data, and outputs the length given by subtracting the maximum delay time .tau.max from the obtained T.sub.GI, to GI extracting section 107 and data separating section 111.
GI extracting section 107 extracts the GI having the length given by extracted GI length determining section 106, and outputs the extracted GI (hereinafter referred to as "extracted GI") to data position adjusting section 108. Data position adjusting section 108 adjusts the rear end of the extracted GI outputted from GI extracting section 107 to the rear end of the data part, and outputs the extracted GI after the data position adjustment, to combining section 109.
Data separating section 111 separates the signal outputted from frequency domain equalization processing section 110 at the position going back the length of the extracted GI determined at the extracted GI length determining section 106 from the rear end of the data part. That is, data separating section 111 separates the part of the data part combined with the extracted GI. The part including the beginning of the data part, not combined with the extracted GI, is outputted to demodulating section 112. The part including the rear end of the data part, combined with the extracted GI, is outputted to demodulating section 113.
Next, the operations of receiving apparatus 100 having the above configurations will be explained with reference to FIG. 5. Data extracting section 104 extracts a portion occupying data part length T.sub.DATA from the beginning of the data part, from the received signal combining the direct wave component, the delayed wave component and the noise component in the receiving apparatus (hereinafter simply "noise component").
In addition, GI extracting section 107 extracts the GI part subtracting the maximum delay time .tau.max from the GI length T.sub.GI. To be more specific, GI extracting section 107 extracts the part of the GI going back the length of the maximum delay time .tau.max from the beginning of the data part (rear end of the GI), that is, the part of the GI that is not interfered with the data of adjacent time.
Data position adjusting section 108 adjusts the data position of the extracted GI such that the rear end of the extracted GI and the rear end of the extracted data part match. Combining section 109 combines the extracted GI after the data position adjustment with the data part. This extracted GI and the rear end of the extracted data part extracted by data extracting section 104 are the same signal. To be more specific, the parts subjected to the combining have different noise components, and so combining these parts results in improved SNR (Signal to Noise Ratio) in the combined part. The signal combined in combining section 109 is subjected to signal distortion equalization in frequency domain equalization section 110. The SNR improves in the part combined with the extracted GI, so that error rate characteristics also improve.
FIG. 6 is a block diagram showing a configuration of transmitting apparatus 200, according to Embodiment 2 of the present invention. According to the figure, RF receiving section 202 performs predetermined radio receiving processing such as down-conversion and A/D conversion for a signal received via an antenna 201, and outputs the processed signal to .tau.max information obtaining section 203.
.tau.max information obtaining section 203 obtains .tau.max information indicating the maximum time of the delayed wave (the maximum delay time), and outputs the obtained .tau.max information to data mapping determining section 204.
Based on .tau.max information outputted from .tau.max information obtaining section 203, data mapping determining section 204 determines the data mapping method and reports the determined data mapping method to data mapping section 207. The data mapping method will be described later.
Here, the data mapping method in data mapping determining section 204 is explained. Data mapping determining section 204 obtains .tau.max information transmitted (fed back) from communicating parties. As shown in FIG. 8, data mapping determining section 204 maps significant information such as the control channel, systematic bits, retransmission bits, ACK/NACK information (ACK or NACK), CQI (Channel Quality Indicator), TFCI (Transport Format Combination Indicator), information required for decoding, pilot bits and power control bits, to the part occupying T.sub.GI-.tau.max from the rear end of the data part, that is, the part where error rate characteristics improve in receiving apparatus 100 of Embodiment 1. According to this mapping method, significant information is correctly transmitted.
If transmitting apparatus 200 regards data A to be inputted to modulating section 205 as significant information and data B to be inputted to modulating section 206 as standard information other than significant information, data mapping section 207 maps data A to the part occupying T.sub.GI-.tau.max from the rear end of the data part, and data B to the rest of the data part.
According to Embodiment 2, significant information can be transmitted to the receiving apparatus correctly, by finding the part where error rate characteristics improve based on .tau.max information and mapping the significant information to the part found out, so that overall system throughput improves.
Further, although a case has been described with the present embodiment where the FDD scheme is adopted and where .tau.max information is fed back from communication parties, the present invention is not limited to this, and it is equally possible to adopt the TDD scheme. If the present invention adopts the TDD scheme, it will be possible to measure .tau.max based on received signals. FDD and TDD do not limit the method of obtaining .tau.max.
In Embodiment 2, a data mapping method of performing data mapping based on .tau.max information has been described. Now, other data mapping methods will be described below. The data mapping method explained in Embodiment 2 is method A, and the methods B to E, which are different methods from method A, will be described below.
First, as shown in FIG. 9, method B maps significant information to the part occupying the GI length (T.sub.GI) from the rear end of the data part. According to this method B, due to variations of .tau.max, not all significant information that is mapped will have improved error rate characteristics. Still, according to this method B, when .tau.max information is difficult to obtain or when installation of additional circuitry for obtaining .tau.max information is undesirable, error rate characteristics of significant information are more likely to improve.
Next, as shown in FIG. 10, method C maps significant information, in the part occupying the GI length (T.sub.GI) from the rear end of the data part, in descending order of significance from the rear end of the data part, because error rate characteristics are likely to improve nearer the rear end of the data part.
The reason will be explained below. .tau.max can vary between zero and T.sub.GI. If .tau.max is zero, the error rate improves in the whole of the part occupying T.sub.GI from the rear end of the data part. Meanwhile, when .tau.max is T.sub.GI, the error rate in the whole of the part occupying T.sub.GI from the rear end of the data part is the same error rate as the rest of the data part, error rate characteristics are not likely to improve.
In actual systems, .tau.max is between zero and T.sub.GI, as shown in FIG. 8, and so, as .tau.max becomes smaller, there are more symbols, from the rear end of the data part, where error rate characteristics improve. Consequently, error rate characteristics are more likely to improve near the end of the data part and are less likely to improve far from the rear end of the data part.
Next, as shown in FIG. 11, method D determines the significance of data and maps data from the rear end of the data part over the entirety of the data part in descending order of significance. According to method D, mapping process over the entirety of the data part can be performed with ease.
Next, as shown in FIG. 12, method E maps significant information to the part occupying the GI length (T.sub.GI) from the rear end of the data part (that is, where the GI originates from) excluding the symbols on both ends. In other words, method E maps significant information to a center portion of the part deriving the GI with priority and does not map information to both ends of that part. The reason is as follows.
Further, according to method E, .tau.max information is not necessary, so that a .tau.max information obtaining section needs not be provided in the transmitting apparatus. The same applies to methods B to D.
GI extracting section 301 obtains T.sub.GI which indicates the length of the GI in received data, and extracts the entire GI (the whole from the beginning to the rear end of the GI) from the direct wave of the signal outputted from RF receiving section 102, based on the obtained T.sub.GI and the timing outputted from direct wave timing detecting section 103. The extracted GI is outputted to data position adjusting section 108.
Data separating section 302 separates the signal outputted from frequency domain equalization processing section 110 at the position going back T.sub.GI from the rear end of the data part and at the position going back two T.sub.GI's from the rear end of the data part. The part including the beginning of the data part, not combined with the extracted GI, is outputted to demodulating section 112. The part including the rear end of the data part, combined with the extracted GI, is outputted to demodulating section 113. The part between the position going back T.sub.GI from the rear end of the data part and the position going back two T.sub.GI's from the rear end of the data part is outputted to demodulating section 303.
Next, the operations of receiving apparatus 300 having the above configuration will be explained with reference to FIG. 14. Data extracting section 104 extracts data occupying the data part length T.sub.DATA from the beginning of the data part of the direct wave, from the received signal combining the direct wave component, the delayed wave component and the noise component in the receiving apparatus. In addition, GI extracting section 301 extracts the GI of the direct wave. The extracted GI includes the GI of the direct wave, a portion of the GI of the delayed wave (T.sub.GI-.tau.max), interference by the previous symbol (.tau.max) and the noise component.
FIG. 15 is a block diagram showing a configuration of transmitting apparatus 400, according to Embodiment 4 of the present invention. Further, according to FIG. 15, the same components as those described in FIG. 6 are assigned the same reference numerals and the details will be omitted. In comparison to FIG. 6, FIG. 15 adds modulating section 401, changes data mapping determining section 204 to 402, and removes RF receiving section 202 and .tau.max information obtaining section 203.
Data mapping determining section 402 determines the data mapping method and reports the determining data mapping method to data mapping section 207. Here, the data mapping method reported to data mapping section 207 will be explained using FIG. 16. The data mapping method, as shown in FIG. 16, maps significant information such as control channels, information required for decoding, systematic bits, pilot bits and power control bits and ACK/NACK information (ACK or NACK), to the part occupying T.sub.GI length from the rear end of the data part, that is, the part where error rate characteristics improve. Further, the data mapping method maps insignificant information such as parity bits and repeating bits to the part between the position going back T.sub.GI from the rear end of the data part and the position going back two T.sub.GI's from the rear end of the data part, that is, the part where error bit characteristics degrade. According to this method, significant information is transmitted correctly to the receiving apparatus and the transmission format can be utilized effectively by mapping insignificant information to the part where quality degrades.
Consequently, with transmitting apparatus 400, data A inputted to modulating section 205 is significant information, data C inputted to modulating section 401 is insignificant information, and data B inputted to modulating section 206 is the other, standard information. In other words, data mapping section 207 maps data A to the part occupying T.sub.GI from the rear end of the data part, data C to the part between the position going back T.sub.GI from the rear end of the data part and the position going back two T.sub.GI's from the rear end of the data part, and data B to the rest of the data part (before or at the position going back two T.sub.GI's from the rear end of the data part).
In FIG. 18, the receiving process according to the present embodiment is shown in a schematic manner. Data extracting section 104 extracts the part occupying data part length T.sub.DATA from the beginning of the data part of the direct wave, from the received signal combined with the direct wave component, the delayed wave component and the noise component in the receiving apparatus.
Further, GI extracting section 107 extracts the GI part going back T.sub.GI-.tau.max from the rear end of the part of the GI of the direct wave. That is, GI extracting section 107 extracts the proportion of the GI that is not interfered with data of adjacent time.
First, as shown in FIG. 19, method E, which corresponds to method A shown in FIG. 8, maps significant information to the part occupying T.sub.GI-.tau.max from the beginning of the data part, that is, to the part where error rate characteristics improve.
As shown in FIG. 20, method F, which corresponds to method B in FIG. 9, maps significant information to the part occupying the GI length (T.sub.GI) from the beginning of the data part.
As shown in FIG. 21, method G, which corresponds to method C in FIG. 10, maps significant information in descending order of significance, from the beginning of the data, to the part occupying the GI length (T.sub.GI) from the beginning of the data part.
As shown in FIG. 23, method I corresponds to the method shown in FIG. 16. Method I maps significant information to the part occupying T.sub.GI from the beginning of the data part, maps insignificant information to the part between the position going back T.sub.GI from the beginning of the data part and the position going back two T.sub.GI's from the beginning of the data part, and maps standard information to the rest of the data part (at or after the position two T.sub.GI's after the beginning of the data part).
Further, "standard information" according to the above embodiments includes, for example, data channels such as HS-DSCH, DSCH, DPDCH, DCH, S-CCPCH and FACH in 3GPP standards.
Furthermore, "significant information" according to the above embodiments includes, for example in 3GPP standards, HS-SCCH associated with HS-DSCH, DCCH, S-CCPCH, P-CCPCH, and PCH for reporting control information for HS-DPCCH and RRM (Radio Resource Management), and, DPCCH for controlling a BCH physical channel.
In addition, "significant information" according to the above embodiments includes TFCI. TFCI is information for reporting data formats, and so, if TFCI is received incorrectly, the data of the whole frame or all subcarriers will be received incorrectly. Accordingly, it is effective to process TFCI as significant information in the above embodiments and improve error rate characteristics of TFCI.
Further, the significant information in the above embodiments includes initialization information (initialization vector) used in information compression or data encryption. This initialization vector provides a base for later communications, and so, if the initialization vector is received incorrectly, a series of communications later may be not be possible at all. Accordingly, it is effective to process initialization vector as significant information in the above embodiments and improve error rate characteristics of the initialization vector.
Each function block employed in the description of each of the aforementioned embodiments may typically be implemented as an LSI constituted by an integrated circuit. These may be individual chips or partially or totally contained on a single chip. "LSI" is adopted here but this may also be referred to as "IC", "system LSI", "super LSI", or "ultra LSI" depending on differing extents of integration.
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