WO2007083700A1

WO2007083700A1 - Radio transmission device and radio transmission method

Info

Publication number: WO2007083700A1
Application number: PCT/JP2007/050691
Authority: WO
Inventors: Atsushi Matsumoto; Daichi Imamura; Sadaki Futagi; Takashi Iwai
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2006-01-19
Filing date: 2007-01-18
Publication date: 2007-07-26

Abstract

Disclosed are a radio transmission device and a radio transmission method capable of reducing the affect of inter-channel interference and improving reception quality even a delay is caused in a contention based channel in a communication system where the contention based channel is time-multiplexed with a scheduled channel. In the device and the method, a contention based channel and a scheduled channel to be transmitted subsequently after the contention based channel are transmitted while being arranged in such a manner that a sub carrier of an end portion of the content base channel (frequency component) and a sub carrier of a head portion of a scheduled channel are at least not overlapped on the frequency axis.

Description

Radio transmission apparatus and radio transmission method

Technical field

[0001] In the present invention, the transmission timing is controlled, and the channel and the transmission timing are controlled! The present invention relates to a radio transmission apparatus and a radio transmission method for transmitting time-division multiplexed with a non-existing channel.

Background art

[0002] Currently, 3GPP RAN LTE (Long Term Evolution) is studying SC-FDMA (Single Carrier-Frequency Division Multiple Access) as an uplink transmission method. In SC-FDMA, a scheduled 'channel (scheduled channel) that is scheduled between users and a contention' based channel (contenti on that is a channel that is not scheduled between users and transmitted by the user) Based channel) multiplexing methods for radio frames have also been studied.

[0003] In addition, there is a technology called TAC (Timing Alignment Control) that reduces interference between users on the uplink. This TAC is a transmission that adjusts the transmission timing of each mobile station so that the reception timing between multiple mobile stations is within a predetermined time range when the base station receives data transmitted by the mobile station. Timing control technology. In particular, for SC — FDE (Single Carrier-Frequency Domain Equalization) purpose, when transmitting 7 flocks, CP (Cyclic Prefix) is added and transmitted, so the difference in reception timing of each mobile station fits in CP By controlling the transmission timing in this way, it is possible to suppress the occurrence of inter-user interference.

[0004] Here, transmission timing control for each of the scheduled 'channel' and the contention 'based' channel will be described. In the scheduled channel, transmission timing control is usually implemented. On the other hand, transmission timing control may not be performed in the contention 'based' channel. The reason for this is that when transmitting RACH (Random Access Channel) used for the initial connection of the mobile station, the upstream signal is transmitted until then, so feedback processing necessary for transmission timing control cannot be performed. From It is. In other words, RACH must be transmitted in a situation where transmission timing control is not implemented.

[0005] In Non-Patent Document 1, as a multiplexing method for the contention 'basic' channel and the scheduled 'channel, a configuration for time division multiplexing or a configuration using both time division multiplexing and frequency division multiplexing has been proposed.

Non-Patent Document 1: NTT DoCoMo, Fujitsu, NEC, SHARP, "Physical Channels and Multiplexing in Evolved UTRA Uplink", Rl— 050850, 3GPP TSG RAN WGl Meeting # 42, London, UK, 29 August-2 September, 2005

Disclosure of the invention

Problems to be solved by the invention

[0006] However, the signal as shown in Fig. 1 transmitted by the above technique has a problem that both the probability contention 'based channel and the scheduled channel increase due to packet error. . The reason will be described below.

[0007] Consider a case where a mobile station transmits RACH on a contention 'based' channel. As described above, since transmission timing control is not performed during RACH transmission, a delay occurs in the reception timing of the base station. This delay increases in proportion to the distance between the base station and the mobile station. Therefore, the reception timing of the contention 'basic' channel is shifted backward in time due to the delay (propagation delay shown in Fig. 2), and the subframe tail part of the contention based channel and the scheduled channel The top of the subframe overlaps (collision shown in Fig. 2), causing interchannel interference. That is, the interference between both channels increases the probability of a packet error and degrades the reception quality.

[0008] An object of the present invention is to provide a communication system in which a contention-based 'channel and a scheduled' channel are time-multiplexed, that is, a channel whose transmission timing is controlled and a channel whose transmission timing is controlled. In a time-multiplexed communication system, even if a transmission timing is controlled and a delay occurs in the reception timing of the channel, the transmission timing is controlled and the channel and the transmission timing are controlled. Wireless transmitters that can reduce the effects of inter-channel interference and prevent degradation of reception quality And providing a wireless transmission method.

Means for solving the problem

[0009] The wireless transmission device according to the present invention includes a contention 'based' channel and a scheduled channel transmitted after the contention-based channel! / Arrangement means for arranging a part of the resource block at the tail part of the channel and a part of the resource block at the head part of the scheduled channel so that all or part of the frequency components do not overlap; And a transmission means for transmitting the contention base channel and the scheduled channel.

The invention's effect

[0010] According to the present invention, in a communication system in which transmission timing is controlled, and the channel and transmission timing are controlled, and the channel is time multiplexed, the transmission timing is controlled. Even if a delay occurs in the channel, the transmission timing is controlled, so that the influence of the inter-channel interference between the channel and the channel whose transmission timing is controlled can be reduced, and the deterioration of the reception quality can be prevented.

Brief Description of Drawings

[0011] [FIG. 1] A diagram for explaining a problem to be solved by the invention

[Fig.2] Diagram for explaining interchannel interference between contention-based channel and scheduled channel

FIG. 3 is a block diagram showing the main configuration of a radio transmission apparatus according to Embodiment 1

FIG. 4 is a flowchart showing details of the operation of the mapping unit according to the first embodiment.

FIG. 5 is a diagram showing an example of a scheduled channel and contention'-based channel according to Embodiment 1.

FIG. 6 is a diagram showing an example of a scheduled channel and contention'-based channel according to Embodiment 1.

[Figure 7] Diagram showing an example of normal mapping

FIG. 8 is a block diagram showing the main configuration of the radio receiving apparatus according to Embodiment 1

FIG. 9 is a flowchart showing details of the operation of the demapping unit according to the first embodiment. FIG. 10 is a block diagram showing the main configuration of a radio transmission apparatus according to Embodiment 2

FIG. 11 is a diagram showing an example of a scheduled channel and contention'-based channel according to the second embodiment.

FIG. 12 shows an example of a scheduled 'channel and a contention' based 'channel according to the second embodiment.

FIG. 13 shows an example of a scheduled 'channel and a contention' based 'channel according to the second embodiment.

FIG. 14 is a block diagram showing the main configuration of a radio receiving apparatus according to Embodiment 2

FIG. 15 is a block diagram showing the main configuration of a wireless transmission apparatus according to Embodiment 3

FIG. 16 is a flowchart showing details of the operation of the mapping unit according to the third embodiment.

FIG. 17 is a diagram showing an example of a scheduled channel and contention'-based channel according to the third embodiment.

FIG. 18 is a block diagram showing the main configuration of a radio receiving apparatus according to Embodiment 3

FIG. 19 is a flowchart showing details of the operation of the channel estimation unit according to Embodiment 3. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, a case where the following matters are preconditions will be described as an example.

(1) A radio transmission apparatus according to the present invention is installed in a mobile station and performs uplink communication.

(2) DFT-S—A wireless transmission apparatus having an OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) configuration.

(3) Contention-based channel (contention based channel), schedule channel (scheduled channel) are time-division multiplexed, and scheduled channel is continuously assigned to contention 'based' channel. The

(4) Contention 'based' channel is transmitting RACH and transmission timing is not controlled. Therefore, the reception timing of the base station is shifted backward in time due to the propagation delay.

(5) Scheduled 'channel is transmission timing controlled. Therefore, the base station The reception timing is correct.

(6) Contention'-based channel and scheduled channel are transmitted from different mobile stations.

(7) Transmission power control is performed, and the received power is almost equal between packets.

(8) For the purpose of applying FDE (Frequency Domain Equalization) on the receiving device side, block transmission that transmits CP in block units with CP is applied.

(9) Since the contention 'based' channel is premised on collision between users, the MCS parameter is originally applied with strong error resilience.

[0013] (Embodiment 1)

In the first embodiment of the present invention, data is mapped so that the tail part of the contention “basic” channel and the head part of the scheduled channel overlap on the frequency axis! /. Here, the contention “based” channel is a channel whose transmission timing is not controlled, and the scheduled channel is a channel whose transmission timing is controlled! As a result, even if the contention “based” channel is delayed, the resource does not directly overlap with the “scheduled” channel, so that interference can be mitigated and packet errors can be reduced.

FIG. 3 is a block diagram showing the main configuration of radio transmitting apparatus 100 according to the present embodiment.

[0015] Radio transmitting apparatus 100 includes encoding section 101, modulating section 102, DFT section 103, mapping section 104, IFFT section 105, CP adding section 106, radio section 107, and transmitting antenna 108, and each section includes The following operations are performed.

[0016] The code unit 101 performs error correction coding processing of transmission data. Modulation section 102 performs modulation processing on the transmission data output from encoding section 101 using a modulation method such as BPSK, QPSK, or 16QAM. The DFT unit 103 performs discrete Fourier transform on the modulated transmission signal output from the modulation unit 102 and converts it into a time waveform force frequency waveform component.

[0017] Mapping section 104 maps the data converted into frequency components onto the frequency resource of the radio frame. At this time, based on the frame number input separately, the transmission data If the data satisfies the predetermined condition, and if the data satisfies this condition, mapping described later is performed on the data.

[0018] IFFT section 105 converts the data mapped on the frequency axis into a time waveform by inverse fast Fourier transform processing. CP adding section 106 duplicates the end of the transmission block and adds this to the beginning of the transmission block to add CP to the transmission signal. Radio section 107 performs predetermined radio processing such as DZA conversion and up-conversion on the transmission signal to which CP is added, and transmits the radio signal to the radio reception apparatus via transmission antenna 108.

FIG. 4 is a flowchart showing details of the operation of the mapping unit 104.

First, mapping section 104 obtains a frame number (ST1010), and based on this frame number, whether transmission data is data of a channel whose transmission timing is controlled, that is, a scheduled channel It is determined whether or not the data is (ST1020).

[0021] When it is determined in ST1020 that the data is scheduled 'channel data, the mapping section 104 determines that the transmission subframe is in contact with the contention' based 'channel, that is, the subframe is contention'. It is determined whether the subframe is transmitted immediately after the base channel (ST1030).

[0022] When the subframe is a subframe transmitted immediately after the contention'-based channel, mapping section 104 determines whether or not the data to be processed is data of the first block of the subframe. (ST1040). If it is the first block, data mapping on the frequency axis is performed on the first block so that it does not overlap with the contention “based” channel data (ST1050). Hereinafter, such a data mapping method in which the data of the two channels must overlap on the frequency axis! / Is called “orthogonal mapping”.

[0023] Note that the transmission data does not contact the contention 'based' channel (ST1030:

If it is not the first block (ST1040: NO), mapping is performed on the data by a normal method (ST1060).

[0024] On the other hand, if it is determined in ST1020 that the transmission data is transmission timing controlled !, and that it is determined that the data is channel data, that is, contention 'based' channel data, mapping section 104 Whether the subframe to be transmitted touches the scheduled 'channel That is, it is determined whether or not the subframe is a subframe transmitted immediately before the scheduled channel (ST1070).

[0025] If the subframe is a subframe transmitted immediately before the scheduled channel, it is next determined whether or not the data to be processed is the data of the last block of the subframe (ST1080). If it is a tail block, orthogonal mapping is performed on the tail block such that it does not overlap with the scheduled channel data (ST1090).

[0026] If the transmission data is not in contact with the scheduled channel (ST1070: NO) or not the last block (ST1080: NO), normal mapping is performed on the data (ST1060).

In this way, the mapping unit 104 determines whether or not the data to be mapped satisfies a predetermined condition based on the input frame number, and performs orthogonal mapping for the data that satisfies the condition. Normal mapping is performed for other data.

FIG. 5 and FIG. 6 are diagrams showing an example of a scheduled channel and a contention-based channel that are finally transmitted from the wireless transmission device 100 as a result of the mapping process. Variations as shown in these figures can be considered for orthogonal mapping.

[0029] Figure 5 shows an orthogonal mapping method in which frequency allocation is performed so that resource blocks are uniformly distributed in one channel, and the frequency of the resource blocks is in an interpolating relationship when both channels are viewed. (Hereinafter referred to as distributed orthogonal mapping). As shown in the figure, resource blocks in a region that may cause inter-channel interference are arranged in a comb shape. As a result, the frequencies of the resource blocks of both channels do not overlap, so that the occurrence of inter-channel interference can be prevented. Further, by arranging the resource blocks so that the resource blocks are dispersed in one channel, a frequency diversity effect can be obtained, and the structure is strong against frequency selective fading.

[0030] FIG. 6 shows an orthogonal mapping method in which resource blocks of one channel are collectively arranged so as not to overlap with the resource blocks of the other channel (hereinafter referred to as continuous orthogonal mapping). ). [0031] For reference, an example of normal mapping is shown in FIG.

Next, radio reception apparatus 1 according to the present embodiment corresponding to radio transmission apparatus 100 described above.

50 will be described. FIG. 8 is a block diagram showing the main configuration of radio receiving apparatus 150.

[0033] Radio section 152 performs predetermined radio processing, such as down-compression and AZD conversion, on the signal received via reception antenna 151. CP deletion section 153 deletes the portion corresponding to CP from the received data. The FFT unit 154 converts the received signal into frequency component data by fast Fourier transform. Channel estimation section 155 estimates the channel variation of the received signal and calculates a channel estimation value. Based on the channel estimation value estimated by channel estimation section 155, FDE section 156 performs equalization processing in the frequency domain on the signal output from FFT section 154.

[0034] Based on the input frame number, demapping section 157 determines whether or not the data to be processed is orthogonally mapped by radio transmitting apparatus 100, and the result of this determination Based on the above, orthogonal demapping Z normal demapping is used to divide and frequency-equalized frequency component data is de-mapped according to a predetermined rule on the frequency resource of radio frame. Details will be described later.

The IDFT unit 158 converts frequency domain data into time waveform data by inverse discrete Fourier transform. The demodulation unit 159 performs demodulation processing on the time waveform data. Decoding unit 160 performs a decoding process on the demodulated signal to obtain received data.

FIG. 9 is a flowchart showing details of the operation of the demapping unit 157. Note that the procedure (ST1020, ST1030, etc.) for determining whether or not the transmission data satisfies the predetermined condition is the same as the procedure shown in FIG. Such explanation is omitted.

[0037] If it is determined that the data to be processed is data that satisfies the conditions of ST1020 to ST1040 (ST1040: YES), this data is overlapped with the contention-based channel data in radio transmitting apparatus 100. It can be determined that such orthogonal mapping is applied. In such a case, the demapping unit 157 performs demapping after interpolating the null frequency component from the data after the data is mapped. ST1510), the demapped signal is output to IDFT section 158 at the subsequent stage.

[0038] On the other hand, when it is determined in ST1020 that the contention is “based” channel data and the data satisfies the conditions of ST1070 and ST1080 (ST1080: YES), the data is stored in the scheduled “channel”. It can be determined that orthogonal mapping that does not overlap with the data is applied. Accordingly, the demapping unit 157 performs demapping after thinning out the frequency component after data is mapped from the data (ST1530), and outputs the demapped signal to the subsequent IDFT unit 158. .

[0039] Note that, if the data power to be processed ^ ST1030, ST1040, ST1070, ST1080 does not satisfy the condition of deviation, demapping section 157 performs normal demapping (ST1520

) o

[0040] As described above, according to the present embodiment, even if the contention 'based' channel is delayed, resources overlapping in both channels are mapped to different frequency components. Therefore, there is no direct overlap, and the influence of inter-channel interference can be reduced. Therefore, the probability of occurrence of packet errors is reduced, and reception quality can be improved.

[0041] In the present embodiment, the number of data (number of subcarriers) mapped to different frequency components in the contention 'based' channel and the scheduled channel need to be the same in both channels. It may be changed according to the situation. For example, if there is a lot of scheduled 'channel traffic, you can increase the number of frequency components in the scheduled' channel, while decreasing the number of frequency components in the contention 'basic' channel.

Further, in the present embodiment, the configuration in which channel estimation section 155 of radio reception apparatus 150 performs channel estimation based on the received pilot signal before fast Fourier transform is shown as an example, but after fast Fourier transform The frequency component power of the received pilot signal may be configured to perform channel estimation.

[Embodiment 2]

In Embodiment 2 of the present invention, when orthogonal mapping is performed on the head portion of the scheduled channel, it is not overlapped on the frequency axis according to the MCS control information of the data. Change the number of frequency components (subcarriers) placed in.

FIG. 10 is a block diagram showing the main configuration of radio transmitting apparatus 200 according to the present embodiment. The wireless transmission device 200 has the same basic configuration as the wireless transmission device 100 (see FIG. 3) shown in the first embodiment, and the same components are denoted by the same reference numerals and the description thereof is omitted. Is omitted.

[0045] Specifically, mapping section 104a maps the data converted into frequency components onto the frequency resource of the radio frame according to a predetermined rule. At this time, the number of frequency components arranged on the frequency axis is changed according to the MCS parameter input separately for the head part of the scheduled channel. More specifically, the number of frequency components is increased for MCS parameters with high error resilience (for example, QPSK), and the number of frequency components is decreased for MCS parameters with low error resilience (for example, 16QAM). .

FIGS. 11 to 13 are diagrams showing examples of a scheduled “channel” and a contention “based” channel transmitted from the wireless transmission device 100. The orthogonal mapping according to the present embodiment has variations as shown in these figures, and the optimal orthogonal mapping method is selected according to the MCS parameter.

FIG. 11 shows a case where MCS parameters with low error tolerance are applied. In such a case, the number of subcarriers in the scheduled “channel” is set such that it does not completely overlap with the contention “basic” channel.

FIG. 12 shows a case where an MCS parameter with medium error resilience is applied. If this is the case, the number of subcarriers in the scheduled 'channel should be the number of data that slightly overlaps the contention' based 'channel.

FIG. 13 shows a case where an MCS parameter with high error tolerance is applied. In such cases, the number of subcarriers in the scheduled 'channel' should be the number of data that overlaps (or almost completely) the contention 'base' channel.

[0050] In other words, in the case of MCS parameters that are less error-prone, such as QPSK, there is a high possibility that they can be demodulated even if they collide with a contention 'based' channel, so the number of mappings on the frequency axis is large. To do. On the other hand, in the case of MCS parameters that are prone to error such as 16QAM, there is a high possibility that demodulation will not be possible if they collide with a contention 'based' channel. Therefore, the number of mapping on the frequency axis is reduced, and mapping is performed so that both channels do not overlap completely.

FIG. 14 is a block diagram showing the main configuration of radio receiving apparatus 250 according to the present embodiment, corresponding to radio transmitting apparatus 200 described above. Note that the same components as those of radio receiving apparatus 150 (see FIG. 8) shown in Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

[0052] The difference from the demapping unit 157 according to Embodiment 1 is that it is arranged so that it does not overlap on the frequency axis according to the MCS parameter of the data with respect to the head part of the scheduled channel The point is that reception processing is performed according to the number of frequency components. Specifically, the demapping unit 157a determines the mapping pattern of the frequency component of the MCS parameter force, and if there is no data, performs the demapping after the frequency component is interleaved IV, and the signal after the demapping is performed. The number is output to IDFT unit 158. Other processes are the same as those in the first embodiment.

[0053] Thus, according to the present embodiment, when orthogonal mapping is performed on the head portion of a scheduled channel, the number of frequency components (subcarriers) is changed according to MCS information. Therefore, the resource usage efficiency can be changed according to the tolerance of interchannel interference (hardness of error due to the influence of the other channel force), so the transmission efficiency can be maintained while reducing the occurrence of packet errors. it can.

In the present embodiment, the case where the error tolerance of the MCS parameter is determined in three stages of strong Z, weak Z, and so on has been described as an example, but the present invention is not limited to this.

[Embodiment 3]

In the third embodiment of the present invention, pilots are mapped so that the tail portion of the contention 'based' channel and the head portion of the scheduled 'channel do not overlap on the force frequency axis.

FIG. 15 is a block diagram showing the main configuration of radio transmitting apparatus 300 according to the present embodiment. The wireless transmission device 300 also has the same basic configuration as the wireless transmission device 100 (see FIG. 3) shown in the first embodiment, and the same components are denoted by the same reference numerals and the description thereof is omitted. Is omitted.

[0057] DFT section 301 performs discrete Fourier transform on the input pilot and outputs the result to mapping section 302. [0058] Mapping section 302 maps the data and pilot, which are output from DFT section 103 and converted into frequency components, onto the frequency resource of the radio frame according to a predetermined rule. However, unlike the mapping unit 104 according to the first embodiment, data is mapped to the tail part of the contention 'based' channel and the head part of the scheduled 'channel so that they do not overlap on the frequency axis. Then map the pilots so that they do not overlap on the frequency axis.

FIG. 16 is a flowchart showing details of the operation of the mapping unit 302. Note that the procedure (ST1020, ST1030, etc.) for determining whether or not the transmission data satisfies the predetermined condition is the same as the procedure shown in FIG. The explanation is omitted.

[0060] When it is determined that the data to be processed is scheduled 'channel data in ST1020 and the conditions of ST1030 and ST1040 are satisfied (ST1040: YES), mapping section 302 applies to the first transmission block. Then, pilot orthogonal mapping is performed so that it does not overlap with contention 'based' channel data (ST3010).

[0061] On the other hand, when it is determined in ST1020 that the data is contention 'basic' channel data and the data satisfies the conditions of ST1070 and ST1080 (ST1080: YES), mapping section 302 transmits the transmission block at the end. On the other hand, orthogonal mapping of pilots is performed so as not to overlap with scheduled channel data (ST3030).

[0062] Note that if the data power of the processing target ^ ST1030, ST1040, ST1070, ST1080 is not satisfied, the mapping unit 302 is not a pilot but normal data (data other than the piuit! Mapping of /, meaning) (ST3020).

FIG. 17 is a diagram illustrating an example of a scheduled channel and a contention-based channel that are finally transmitted from the wireless transmission device 300 as a result of the mapping process.

FIG. 18 is a block diagram showing the main configuration of radio receiving apparatus 350 according to the present embodiment, corresponding to radio transmitting apparatus 300 described above. Note that the same components as those of radio receiving apparatus 150 (see FIG. 8) shown in Embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

Unlike Embodiments 1 and 2, in this embodiment, channel estimation section 351 performs transmission. A determination is made as to whether the data satisfies the predetermined condition. Therefore, the channel estimation unit 351 receives the frame number, and first extracts only the pilot signal from the pre-demapped signal output from the FFT unit 154. Channel estimation section 351 performs channel estimation by the method described later using this pilot signal. FDE section 156 performs equalization processing in the frequency domain on the signal output from FFT section 154 based on the channel estimation value calculated by channel estimation section 351.

FIG. 19 is a flowchart showing details of the operation of channel estimation section 351. Note that the procedure (ST1020, ST1030, etc.) for determining whether or not the transmission data satisfies the predetermined condition is the same as the procedure shown in FIG. The detailed explanation is omitted.

[0067] If it is determined that the data to be processed is data that satisfies the conditions of ST1020 to ST1040 (ST1040: YES), this data is overlapped with the contention-based channel data in radio transmitting apparatus 300. Therefore, it can be determined that the pilots are orthogonally mapped. In such a case, channel estimation section 351 performs channel estimation using the orthogonally mapped pie mouth after the pilot is mapped, the frequency component is set to the interbow IV, and so on (ST3510). The thinned frequency component may be supplemented by subsequent interpolation processing.

[0068] On the other hand, if it is determined in ST1020 that the data is contention 'basic' channel data and the data satisfies the conditions of ST1070 and ST1080 (ST1080: YES), the data is stored in the scheduled 'channel. It can be determined that the pilots are orthogonally mapped so that they do not overlap with the data. Therefore, channel estimation section 351 performs channel estimation after thinning out the frequency components, which should be mapped to the noise (ST3530). Note that the thinned frequency component may be supplemented by subsequent interpolation processing.

[0069] If the data power of the processing target ^ ST1030, ST1040, ST1070, ST1080 is not satisfied, the channel estimation unit 351 performs channel estimation using the pilot mapped in the normal method. Perform (ST3520).

[0070] Thus, according to the present embodiment, even if the contention 'based' channel is delayed, the resources that may overlap in both channels are different. Since the noise is mapped to the frequency component to be transmitted, the data part (meaning the part other than the pilot) is not directly overlapped, and the interference between channels can be mitigated. As a result, the probability of occurrence of a packet error is reduced, and deterioration of reception quality can be prevented.

[0071] In the present embodiment, it is not always necessary to perform DFT processing on the pilot, and it is also possible to store the transmission pattern in the frequency domain in a memory or the like in advance.

[0072] Further, in channel estimation section 351 of radio receiving apparatus 350 according to the present embodiment, when channel estimation is performed with a time domain signal before high-speed Fourier transform, frequency components are thinned out and Z is unaware. In addition, a configuration in which the same channel estimation process is applied to both signals is also conceivable.

[0073] The embodiments of the present invention have been described above.

[0074] The wireless transmission device and the wireless transmission method according to the present invention are not limited to the above embodiments, and can be implemented with various modifications.

[0075] A radio transmission apparatus according to the present invention can be mounted on a communication terminal apparatus and a base station apparatus in a mobile communication system, and thereby has a similar effect to the above. , A base station apparatus, and a mobile communication system can be provided.

In each of the above-described embodiments, the contention 'basic' channel and the scheduled channel have been described as examples. However, the reception timing is not necessarily limited to these channels. It can be applied to channels that shift backwards due to propagation delay and channels whose reception timing is always adjusted by transmission timing control.

[0077] Also, here, taking the contention 'based' channel tail block and the scheduled block's head block as an example, the power described as resources that interfere with each other is not necessarily limited to this precondition. For example, the present invention can be applied to a tail block of a contention-based channel whose transmission timing is not controlled and a head block of a contention 'basic' channel whose transmission timing is controlled. The

[0078] Further, here, force using DFT or IFFT as an example is not limited to this. IFFT can be IDFT!

[0079] In addition, here, the force described with the DFT-s-OFDM configuration as an example is not limited to this, and in the case of a distributed frequency arrangement, IFDMA (Interleaved Frequency Division Multiplex)

In a configuration that uses (Access).

[0080] Also, in each of the above embodiments, on the assumption that the frame number and each channel are uniquely assigned, it is determined whether to distinguish between channels, or whether both channels are in contact with each other. However, a configuration may be adopted in which such information is instructed by the base station power.

In addition, the contention 'basic' channel in each of the above embodiments is used for RACH, and the scheduled 'channel is transmitted via the shared' channel. The shared channel is sometimes called PUSCH (Physical Uplink Shared channel).

[0082] Here, the power described with reference to an example in which the present invention is configured by nodeware can also be realized by software. For example, the wireless transmission method algorithm according to the present invention is described in a programming language, the program is stored in a memory, and is executed by an information processing means, so that functions similar to those of the wireless transmission device according to the present invention are achieved. Can be realized.

Further, each functional block used in the description of each of the above embodiments is typically realized as an LSI that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all of them.

[0084] Further, here, it may be called IC, system LSI, super LSI, unroller LSI, etc., depending on the difference in power integration as LSI.

Further, the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection or setting of circuit cells inside the LSI.

[0086] Furthermore, integrated circuits that replace LSIs due to advances in semiconductor technology or other derived technologies. If road technology appears, of course, it is also possible to perform functional block integration using that technology. There is a possibility of adaptation of biotechnology.

[0087] The disclosure of the specification, drawings, and abstract contained in the Japanese Patent Application No. 2006-010624 filed on Jan. 19, 2006 is incorporated herein by reference.

Industrial applicability

[0088] The radio transmission apparatus and radio transmission method according to the present invention can be applied to applications such as a communication terminal apparatus and a base station apparatus in a mobile communication system.

Claims

The scope of the claims

[1] In the contention based channel and the scheduled channel that is transmitted following the contention based channel, the tail part of the contention 'based' channel Arrangement means for arranging a part of the resource block and a part of the resource block at the beginning of the scheduled channel so that all or part of the frequency components do not overlap,

Transmitting means for transmitting the contention'-based channel and the scheduled channel;

A wireless transmission device comprising:

[2] The arrangement means includes:

Distribute and arrange resource blocks in the tail part of the contention 'based' channel,

2. The radio transmission apparatus according to claim 1, wherein resource blocks at the beginning of the scheduled channel are also distributed.

[3] The arrangement means includes:

The resource blocks in the tail part of the contention 'based' channel are arranged in succession,

2. The radio transmission apparatus according to claim 1, wherein resource blocks at a head portion of the scheduled channel are also arranged continuously.

[4] Control means for controlling the number of subcarriers in the head portion of the scheduled channel according to the MCS parameter of the data portion of the scheduled channel,

The wireless transmission device according to claim 1, further comprising:

[5] The arrangement means includes:

Placing pilots at the tail of the contention base channel and at the beginning of the scheduled channel;

The wireless transmission device according to claim 1.

6. A communication terminal device comprising the wireless transmission device according to claim 1.

7. A base station device comprising the wireless transmission device according to claim 1.

[8] Contention'-based channel and the scheduled channel transmitted following the contention-based channel and a part of the resource block at the tail of the contention-based channel Arranging a part of the resource block of the head part of the scheduled channel so that all or part of the frequency components do not overlap;

Transmitting the contention'-based channel and the scheduled channel;

A wireless transmission method comprising: