Method of transmitting control signal using efficient multiplexing

FIELD: information technology.

SUBSTANCE: method of transmitting control signal involves steps for multiplexing a plurality of 1-bit control signals within a given time-frequency domain via code division multiple access (CDMA) and transmitting the multiplexed control signals, wherein the plurality of the 1-bit control signals includes a plurality of 1-bit control signals for a specific transmitting side.

EFFECT: high efficiency and reliability of multiplexing.

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The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to a method for transmitting a control signal in the communication system with mobile objects with multiple carrier frequencies and, in particular, to a method of transmitting a control signal. Although the present invention is suitable for a wide range of applications, it is particularly suitable for reliable transmission of the control signal in an upward and/or downward direction through the effective multiplexing of multiple 1-bit control signals.

Prior art

Usually in the communication system with mobile objects with multiple carrier frequency base station performs transmission of data packets in a top-down channel in units of user equipment (abbreviated as UE - user equipment)in any one cell or in each of the multiple cells. Meanwhile, within one cell may be many pieces of user equipment. Since each of multiple user equipment is not able to determine how the data packet will be given using the specified format, then, when the base station transmits downstream data packet for a certain user equipment, the base station must transmit the necessary info is the information, to transmit each data packet in a downward direction, as the information on the identifier (ID) of the user equipment, which will take the corresponding data packet, the information about frequency-time domain for transmission of the data packet, information about the format of the data, including bit rate, modulation scheme and other relevant information, HARQ (hybrid automatic repeat request - hybrid automatic request for retransmission), etc. in a downward direction.

In another case, to provide the user equipment, the transmission of the data packet in the uplink direction, the base station should transmit such information necessary for the transmission of each data packet in the uplink direction, as the information on the identifier (ID) of the user equipment, which will be assigned for transmission of the data packet, the information about the time-frequency region in the uplink direction, allowing the user equipment to transmit the data packet, information about the format of the data, including bit rate, modulation scheme and other relevant information, HARQ, etc. in a downward direction.

When the transmission of data packets in the uplink direction, the base station should transmit information about the confirmation of successful reception/support received(ACK/NACK) for each data transferred to the user equipment corresponding to the user equipment in the uplink direction. On the other hand, in the case of transmission of data packets in the downstream direction, each user equipment transmits information about the successful or unsuccessful reception of the data for each data packet transmitted by the base station, by transmitting information ACK/NACK in the uplink direction.

To maintain the power transmission/reception data in the uplink direction of each of the user equipment at an appropriate level, the base station should transmit information to the power control for each user equipment in the downstream direction.

From the above control signals signal ACK/NACK signal power control, etc. mostly able to display relevant information with one bit, and may be called "1-bit control signal".

In order to effectively establish the system and to manage it, it is necessary to effectively multiplex the control signal transmitted in the upward/downward direction and is designed for efficient transmission of the above-mentioned control information and, in particular, the 1-bit control signal with the service data and other signals in the time-frequency resource.

As the e scheme of multiplexing, commonly used in communication systems with mobile objects with multiple carrier frequencies, can be used multiple access with time division TDMA (time division multiple access), which allows for multiplexing multiple signals by dividing them into time domain multiple access frequency division FDMA (frequency division multiple access), which allows for multiplexing multiple signals by dividing them into the frequency domain, multiple access, code-division CDMA (code division multiple access), which allows for multiplexing signals in a given frequency-time domain using an orthogonal or pseudoorthogonal code or other

However, when 1-bit control signal is multiplexed using only TDMA and/or FDMA, since the transmission power of each signal are significantly different, the effect on neighboring cells may vary depending on the time domain and/or frequency domain.

In particular, when an arbitrary cell performs multiplexing for transmission of signals ACK/NACK for different units of the user equipment within the same time interval for transmission of TTI (time transmission interval) by using TDMA or FDMA, for example, in the case where the transmission power of the ACK/NACK for each of the user equipment C is acetelyne differ, the amount of interference from the corresponding cell, affecting neighboring cells, can vary significantly depending on the time domain or the frequency domain. This can affect scheduling downlink data packets in the cellular range or effectiveness of the energy distribution in the frequency-time domain.

In addition, when the control signal such as ACK/NACK transmission side, is lost in the transfer process in the descending/ascending direction, there may occur a problem of reliability of the transmission signal.

DISCLOSURE OF THE INVENTION. A TECHNICAL PROBLEM. TECHNICAL SOLUTION

Accordingly, the present invention relates to a method for transmission in the communication system, mobile control signal with multiple carrier frequencies, which essentially eliminates one or more problems related to limitations and disadvantages of the prior art.

The aim of the present invention is to provide a method for effective transmission of multiple control signals, whereby the control signal to a specific transmitting side can be reliably transmitted so that the multiplexing in the transmission of the control signal was carried out efficiently to minimize mazzanovich interference.

Additional features and advantages of the present invention will be disclosed in the following description and will be clear from the parts specified description, or may be known in practice of the invention. The objectives and other advantages of the present invention will be realized and attained by using patterns, in particular, described in the specification and claims and the attached drawings.

To achieve these and other advantages and in accordance with the present invention, as embodied and broadly described, a method of transmitting a control signal in accordance with the present invention includes multiplexing multiple 1-bit control signals within a given frequency-time domain using multiple access code division (CDMA), repetition multiplexed control signals in different frequency regions and the repeated transmission of control signals.

To achieve these and other advantages and in accordance with the present invention, as embodied and broadly described, a method of transmitting a control signal in accordance with the present invention includes multiplexing multiple 1-bit signals within a given frequency-time domain using multiple access code division (DMA) and the repeated transmission of control signals, moreover, many 1-bit control signals includes many 1-bit control signals for a particular transferor.

Preferably, the set of frequency-time domain contained a frequency-time domain within the zone of one OFDM symbol (orthogonal frequency division multiplexing - multiplexing orthogonal frequency division).

Preferably, when the temporary area used for transmission of the control signal contains a single zone OFDM-symbol repetition is performed by repeating a multiplexed control signals in different frequency regions within the area of one OFDM symbol.

Preferably, when the temporary area used for transmission of the control signal, contains many areas of OFDM symbols, the repetition was carried out by repeating a multiplexed control signals in different frequency areas within the zones of OFDM symbols that are different from each other.

Preferably, when multiplexing multiple 1-bit control signals were separated using orthogonal or pseudoorthogonal code used for multiplexing each of the 1-bit control signals.

More preferably, the set of 1-bit control signals modulated the by separating the various components with orthogonal phases, respectively, and for multiplexing, many 1-bit control signals are additionally separated by using different component orthogonal phases used for modulation.

Preferably, the set of frequency-time domain included the multiple frequency and time domains. When additional multiplexing multiplexing is performed using at least one selected from the group consisting of multiple access time division (TDMA) and multiple access frequency division (FDMA). And many 1-bit signals for a particular transferor is multiplexed by distributing the multiple frequency and time domains.

More preferably, the 1-bit control signals for the various transmitting parties were multiplexed in a variety of frequency-temporal regions using multiple access code division (CDMA), respectively. In this case, the set of 1-bit control signals for a particular transferor is multiplexed using different orthogonal or pseudoorthogonal codes.

And orthogonal or pseudoorthogonal codes include a code sequence, the length of which corresponds to the size of the set of frequency-time domains.

In addition, the 1-bit control signal can provide the enable signal to the ACK/NACK or the signal power control. And 1-bit control signal can be transmitted in an upward or downward direction.

It should be understood that the foregoing General description and the following detailed description are exemplary and explanatory and are intended for further explanation of the claimed invention.

Advantages of the INVENTION

In accordance with one embodiments of the present invention for multiplexing multiple 1-bit control signals control is used mainly CDMA. And it allows you to convey more control signals of a specific user equipment through different orthogonal or pseudoorthogonal codes, respectively. Therefore, it can increase the reliability of transmission of the corresponding control signals.

The number of multiplexed signals in the frequency band of coherence and/or the coherence time can be increased by applying FDMA and/or TDMA when the simultaneous transmission of 1-bit control signals, and through distribution at the transmission of multiple control signals for a specific user equipment at each time-frequency region.

Moreover, in case of transmitting 1-bit control signal through a set of frequency-temporal regions put the m refer to the use of orthogonal code, used for transmission in accordance with the size of all the frequency-temporal regions instead of the size of each time-frequency region, you can increase the number of control signals that can be transmitted simultaneously.

In addition, when to transmit 1-bit control signals using multiple OFDM symbols by passing the modulated using CDMA 1-bit control signal in another area OFDM symbol through another frequency region, it is possible to perform efficient transmission aspects of resource efficiency and gains from explode. And it is also possible to provide a more flexible power distribution within each region OFDM symbol.

Description of the DRAWINGS

The accompanying drawings, which are included to provide a better understanding of the present invention, incorporated and constitute part of this description, illustrate embodiments of the present invention and together with the description serve to explain the principles of the invention.

Drawings include:

Figure 1, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of multiplexing to transfer signals ACK/NACK using CDMA;

Figure 2, which presents the scheme in accordance with one variant of the implementation of the present invention, designed to explain how signaling ACK/NACK by conducting simultaneous multiplexing using CDMA and FDMA;

Figure 3, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK by conducting simultaneous multiplexing using CDMA, TDMA and FDMA;

Figure 4, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK by conducting simultaneous multiplexing using CDMA and FDMA, where many signals ACK/NACK transmitted by a particular transmitter side among many other signals ACK/NACK is transmitted through multiple frequency domains;

Figure 5, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK by conducting simultaneous multiplexing using CDMA, TDMA and FDMA, where many signals ACK/NACK transmitted by a particular transmitter side among many other signals ACK/NACK is transmitted through multiple frequency domains;

6, which presents the scheme in accordance with one variant of implementation of the ia of the present invention, designed to explain how signaling ACK/NACK in the case of use for signaling ACK/NACK zone of one OFDM symbol;

7, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK in the case of use for signaling ACK/NACK at least two zones of OFDM symbols;

Fig, which presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK in the case of using at least two zones of OFDM symbols;

Figure 9, which presents a diagram intended to explain the principle, allowing to increase the flexibility of power distribution in the case of signaling ACK/NACK using a variant of implementation of the present invention, presented at Fig.

DESCRIPTION of the PREFERRED embodiments of the INVENTION

Let us now turn to the detailed description of preferred embodiments of the present invention, examples of which are illustrated by the accompanying drawings.

Typically, the base station transmits the ACK/NACK indicating the success or failure of receiving a data packet transmitted by the unit of the user equipment in which abedelah cell or control signal, playing a role similar to the role played by the ACK/NACK for the corresponding user equipment in a downward direction. In this case, since the set of units of user equipment capable of transmitting data packets within a time interval of transmission (TTI), a base station capable of transmitting signals ACK/NACK on the set of the user equipment within one time interval for transmission.

In addition, the base station multiplexes many signals power control for controlling the conveying capacity of the ascending data set of the user equipment during one time interval for transmission within the cell, and then transmits the multiplexed signal to each user equipment.

Thus, in accordance with the embodiment of the present invention in order to effectively multiplexing and effective transfer multiple 1-bit control signals, a method for multiplexing the 1-bit control signals using CDMA within the partial time-frequency region of the strip transmission in the communication system with multiple carrier frequencies. And this will be explained in detail with reference to the example.

In addition, the description of one in the approaches of the implementation of the present invention applies, when, for example, 1-bit control signal is a signal ACK/NACK. In the method of transmitting control signals in accordance with one embodiment of the present invention, 1-bit control signal need not be a signal of ACK/NACK. In addition, specialists in the art it is obvious that the present invention includes a 1-bit control signal in this format, when multiple signals are transmitted within one time interval for transmission.

Figure 1 presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of multiplexing to transfer signals ACK/NACK using CDMA.

As shown in figure 1, in accordance with one embodiments of the present invention, the base station reserves a certain frequency-time domain within one time interval for transmission to use for signaling ACK/NACK. And the signals ACK/NACK for different units of user equipment (UE) are separated from each other by using orthogonal or pseudoorthogonal code, multiplied in the frequency-time domain.

In this case, the orthogonal code" or "pseudoorthogonal code" is a code used for multiplexing signal using CMA, and means code that indicates that the correlation is equal to 0 or a value less than the specified threshold value.

In accordance with one preferred embodiment of the present invention in the case of performing transmission using modulation, which uses components having phases orthogonal to each other, such as QPSK (a quadrature phase shift keying - quadrature phase shift keying), many signals ACK/NACK may optionally be separated by using different orthogonal phase components.

In the example shown in Figure 1, since the ACK/NACK is transmitted through a frequency-time domain, which includes 12 subcarriers frequencies, six OFDM symbols within one time interval for transmission, it is possible to use orthogonal code of length 72=(612) chip for transmission of ACK/NACK. Consequently, it is possible to simultaneously transmit 72 different orthogonal signal. However, the number of simultaneously transmitted orthogonal signals may be changed in accordance with the type of orthogonal/pseudoorthogonal code.

In the case of using QPSK as the modulation scheme in the example shown in Figure 1, you can use two orthogonal phases. Therefore, it is possible to transmit the total number of different orthogonal signals twice is great, than seventy-two orthogonal signal.

In addition, the ACK/NACK for one unit of the user equipment can be transmitted by using one of the orthogonal signal of the orthogonal signals generated using the above method. However, in accordance with another embodiment of the present invention, it is proposed that the ACK/NACK for a single user equipment was installed to pass through the set of orthogonal signals, if a single ACK/NACK carries information in excess of 1 bit, or if a single user equipment transmits multiple data packets within one time interval for transmission.

As in the above one embodiment of the present invention, the advantage of multiplexing to transmit the ACK/NACK using CDMA in a downward direction is that the amount of noise generated in the downward direction signal ACK/NACK in the frequency-time domain one time interval for transmission, can be maintained relatively equal.

In particular, when, as described above, an arbitrary cell performs multiplexing for transmission of signals ACK/NACK for different units of the user equipment within the same time interval of transmission (TTI) way is using TDMA or FDMA in case if the transmission power of the signals ACK/NACK for the corresponding units of user equipment (UE) differ from one another, the amount of interference from the corresponding cell, affecting neighboring cells can vary significantly depending on the time domain or the frequency domain. And this could have an adverse impact on the scheduling of the transmission of downlink data packets or other distribution of "time-frequency-energy" in the area served by the station of the cellular communication. However, when the ACK/NACK is multiplexed using CDMA as one variant of implementation of the present invention, even if a different transmit power of the ACK/NACK are distributed to the various units of the user equipment, the signals ACK/NACK for all units of the user equipment are added together within the same time-frequency region for one time interval for transmission and then transmitted. Consequently, it is possible to minimize the fluctuation of the transmission power within a time-frequency region.

In accordance with another embodiment of the present invention, in the case when multiple signals ACK/NACK transmitted by the individual user equipment, or to transfer data from one user equipment is transmitted through many what regionalnych signals, there is a possibility to increase the reliability of signal transmission, ACK/NACK for the corresponding user equipment.

In addition, the above-described principle of transmission of ACK/NACK in a downward direction similarly applicable to the transmission in the uplink direction.

Meanwhile, when the multiplexing of ACK/NACK using CDMA, as mentioned in the description above, the orthogonality between different signals ACK/NACK, multipleksiranje using CDMA, can be maintained only if the characteristic response of the downward channel is not significantly changed in the time-frequency region for transmitting ACK/NACK. Thus, there is an opportunity to provide satisfactory reception quality without the use of special algorithm of reception, such as channel equalizer at the receiving side. In a preferred embodiment of the present invention multiplexing using CDMA signal ACK/NACK is performed within a time-frequency region in which the characteristic response of the radio channel is not significantly changed, that is, within the coherence time and bandwidth coherence.

In accordance with the detailed embodiment of the present invention, the scheme of multiplexing of ACK/NACK based on CDMA can be performed simultaneously with the scheme of multiplexing on the Snov, FDMA or TDMA, to narrow the frequency-time domain for multiplexing of ACK/NACK using CDMA within the range of coherence, in which the characteristic response of the radio channel is not significantly changed. This is explained as follows.

Figure 2 presents the scheme in accordance with the embodiment of the present invention, intended to explain the method of signaling ACK/NACK through the implementation of multiplexing simultaneously using CDMA and FDMA.

As shown in figure 2, the various signals ACK/NACK can be transmitted in the frequency-temporal areas, separated from each other by two frequency axes. And various signals ACK/NACK can multiplicious using CDMA in each of the frequency-temporal areas. In this case, in accordance with the embodiment of the present invention, when the signals ACK/NACK is transmitted through two frequency domain, one can observe that the width of each of the frequency domains established on an area of 6 subcarriers of frequencies, which is narrower than the area 12 subcarriers frequencies.

In particular, as in the example shown in Figure 2, each of the two frequency-temporal regions includes six OFDM symbols and twelve subcarriers of frequencies that can be passed 36=(66) orthogonal signals using CDMA. Because within the same time interval transmission uses two chaston the temporary area, there is a possibility to transfer 72=(362) orthogonal signal.

In the case of QPSK modulation, because the signals ACK/NACK can be further divided by using two orthogonal phases, there is a possibility to transfer the total number of different orthogonal signals, which is twice more than 72 orthogonal signal.

Figure 3 presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK, by performing multiplexing simultaneously using CDMA, TDMA and FDMA.

In particular, figure 3 presents an example in which the multiplexing of the signals ACK/NACK can be performed simultaneously using CDMA, FDMA and TDMA.

As shown in Figure 3, the various signals ACK/NACK can be transmitted in four frequency-temporal areas, with a smaller change channels. And various signals ACK/NACK can multiplicious in each of the frequency-temporal regions using CDMA.

In particular, in the example shown in Figure 3, since each of the frequency-temporal regions includes three OFDM symbol and six subcarriers of frequencies, there is a possibility to transfer 18=(36) ACK/NACK using CDMA. Because within one time interval for transmission, there are four frequency-time region, it is also possible to transfer 72(184) ACK/NACK. As for QPSK transmission can be used in two orthogonal phases, have the opportunity to transmit twice as many different signals ACK/NACK.

In the above scheme of multiplexing signals ACK/NACK presented in figure 2 or Figure 3, the scheme of transfer of various signals ACK/NACK in each of the frequency-temporal regions more preferable compared to the scheme presented in figure 1, that each of the signals ACK/NACK can be transmitted within the frequency-time domain, with minor fluctuations in characteristics of the response of the radio channel. However, in the case of poor quality of the radio channel for a given user equipment in a time-frequency region for transmitting signals ACK/NACK characteristics of the reception signals ACK/NACK corresponding user equipment may be greatly impaired.

Therefore, in one embodiment, the present invention serves to transmit signals ACK/NACK for a specific user equipment within the same time interval for transmission over frequency-time region, remote from the set of frequency-time axes. In one embodiment, the present invention also proposes a framework for withdrawal from the frequency-time diversity when receiving signals ACK/NACK on the receiving side with the multi is lakirovanie signals ACK/NACK for different units of the user equipment using CDMA in each time-frequency region.

Figure 4 presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK through the implementation of multiplexing simultaneously using CDMA and FDMA, where many signals ACK/NACK transmitted by a particular transmitter side among many other signals ACK/NACK is transmitted through multiple frequency domains.

As shown in figure 4, the receiving party is able to benefit from frequency diversity due to the way in which the ACK/NACK is transmitted through two different frequency region. In the example shown in Figure 4, the ACK/NACK is transmitted through two frequency-time region, and various signals ACK/NACK are multiplexed in each of the frequency and time domains.

In particular, since each frequency-time domain includes six OFDM symbols and six subcarriers of frequencies, there are 36=(66) signals ACK/NACK, which can multiplicious using CDMA in each of the frequency-temporal areas. As for QPSK transmission can be used in two orthogonal phases, have the opportunity to transmit twice as many different signals ACK/NACK.

As mentioned above, when the multiplexing of the different ACK/NACK within each of the frequency-temporal regions, which uses the PRS is agonally code adjustable in accordance with the size of each of the frequency-temporal regions, the signals ACK/NACK transmitted through different frequency-time region for a specific user equipment (UE)can multiplicious using the same orthogonal code of the orthogonal codes used for each of the frequency and time domains.

However, in one embodiment, the present invention proposes that the signals ACK/NACK transmitted through different frequency-time region for a specific user equipment are multiplexed using the same orthogonal code of the orthogonal codes used for each of the frequency and time domains.

Thus, in the case when the signals ACK/NACK for a specific user equipment are multiplexed using different orthogonal codes in each area, it is possible to prevent reduction in the efficiency of receiving special effect of reducing the orthogonality with other signals ACK/NACK, which is a definite signal ACK/NACK is multiplexed using CDMA within a certain time interval of the transmission. And this scheme can be extended to allow to transmit the ACK/NACK of a certain user equipment used is to eat a variety of orthogonal codes in various frequency-temporal areas, even if the ACK/NACK is transmitted in at least three frequency-time region.

In the case when the signals ACK/NACK is transmitted through the multiple frequency and time domains as shown in figure 4, in one preferred embodiment of the present invention, it is proposed that more signals ACK/NACK can simultaneously be transmitted in this way, when orthogonal codes are determined depending on the total size of all areas instead of defining orthogonal codes depending on the size of each of the frequency-temporal regions, and then, accordingly, passed many signals ACK/NACK.

In particular, in the example shown in Figure 4, by obtaining 72 orthogonal codes in accordance with the length of 72=(612) chip according to six OFDM-symbols and 12 subcarriers frequencies belonging to the two frequency-time domains, for transmission of multiple signals ACK/NACK specific user equipment instead of the length 36 of the chips according to six OFDM-symbols and six subcarriers frequencies belonging to one time-frequency region, there is the possibility to simultaneously transmit 144 ACK/NACK using different orthogonal phases in the case of using QPSK transmission.

In this case, the problem arising from the fact that the orthogonality between the orthogonal codes decreases XVI is a significant difference between the responses of different radio frequency-temporal regions, can be solved by capacity allocation signaling ACK/NACK, which differ from each other in accordance with the characteristics of the partial cross-correlation between the orthogonal codes.

In particular, if the transmission power of the orthogonal codes within the corresponding group coordinated by grouping codes that are defined as having low orthogonality among the above-mentioned orthogonal codes, the above problem of orthogonality can be removed.

Figure 5 presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK through the implementation of multiplexing simultaneously using CDMA, TDMA and FDMA, where many signals ACK/NACK transmitted by a particular transmitter side of many other signals ACK/NACK is transmitted through the multiple frequency and time domains.

Figure 5 presents an example in which the gain from frequency-time diversity is obtained due to the way in which the signals ACK/NACK for a specific user equipment is transmitted through two different frequency-time region.

In particular, the signals ACK/NACK for the units of user equipment (UE) from 1 to N/4 is transmitted through a frequency-time domain, in the lion the th upper part of Figure 5, and frequency-time domain, located at the bottom right of Figure 5, while the signals ACK/NACK for the units of user equipment with N/4+1 N/2 are transmitted through a frequency-time domain, located in the lower left portion of Figure 5, and the frequency-time domain, located at the top right of Figure 5.

In particular, the signals ACK/NACK for a specific user equipment in the example shown in Figure 5, are passed through two frequency-time region. Various signals ACK/NACK are multiplexed using CDMA within each of the frequency-temporal areas and then transmitted.

In addition, eighteen signals ACK/NACK may be transmitted through orthogonal codes corresponding to the length 18=(36) chips in three OFDM symbol and six subcarriers of frequencies within each frequency and time domains. As for QPSK transmission can be used in two orthogonal phases, there is a possibility to transfer 36 different signals ACK/NACK number is twice the previous signals ACK/NACK.

In the example shown in Figure 5, it is possible to divide the signals ACK/NACK transmitted through different frequency-time region for a specific user equipment, from other signals ACK/NACK using the same orthogonal code. However, the gains from diversity can be obtained benefit is are multiplexed signals ACK/NACK within each of the frequency-temporal regions, using different orthogonal codes.

In addition, in the example shown in Figure 5, in the case when orthogonal codes are determined depending on the total size of all frequency-temporal regions instead of defining orthogonal codes depending on the size of each of the frequency-temporal regions, it is possible to transmit more signals simultaneously ACK/NACK.

In particular, by determining the orthogonal codes of length 18 of the chips formed by the three characters and six subcarriers frequencies included in each of the frequency-temporal areas, but for the length 72 of the chip, formed just six OFDM symbols and 12 subcarriers frequencies, it is possible to transmit simultaneously a greater number of signals ACK/NACK.

In the stated embodiments, the implementation presented on Figs 1 5 1-bit control signal such as ACK/NACK is transmitted through the extension 3 or 6 zones OFDM symbol using, for example, CDMA. In addition, the area of the OFDM symbol used for transmitting 1-bit control signal such as ACK/NACK, may include at least one or more OFDM-symbols.

Among the methods of transmitting 1-bit control signal (ACK/NACK) in accordance with the above variants of implementation of the present invention the method is repeated is peredachi signals ACK/NACK in many frequency-temporal regions to ensure gains from diversity transmission can be diversified in accordance with the number of available zones OFDM symbols. Next, the description will be considered a way of signaling ACK/NACK effectively in accordance with the number of OFDM symbols used for transmitting signals ACK/NACK.

Figure 6 presents the scheme in accordance with one embodiments of the present invention, intended to explain the method of signaling ACK/NACK in case of using 1 zone OFDM symbol for transmitting signals ACK/NACK.

In particular, figure 6 shows that four ACK/NACK expand with the expansion coefficient (SF is a spreading factor of 4 in area 1 OFDM symbol are multiplexed using CDMA and then transmitted. On 6 separate block indicates one area of carrier frequencies. And aijindicates the ACK/NACK, multiplexity using CDMA. In this case, "i" denotes the index of the extensible and multiplexing signal and "j" denotes an index indicating a group multiplexing signal ACK/NACK. Group ACK/NACK indicates the set multiplexing signals ACK/NACK. Depending on the needs of each system and resource situation, there may be multiple groups of ACK/NACK. For clarity and convenience of figure 6 taken that there is only one group of ACK/NACK.

Since in the present embodiment, it is assumed the case when for transmitting signals ACK/NACK is only one OFDM symbol, it is impossible in signal transmission ACK/NACK on the learning gains from explode on the time axis.

However, to benefit from explode along the frequency axis, the signals ACK/NACK multiplexed along the frequency axis using CDMA, can be re-transmitted in different frequency regions.

Figure 6 presents an example in which the signals ACK/NACK multiplexed using CDMA, four times repeated in different frequency regions. In this case, the fourfold repetition is just an example to get explode. The number of repetitions may vary depending on the channel status and the situation of system resources. Figure 6 each of the four times repeated signals ACK/NACK has the same indexes (i, j)to emphasize the repetition signals. But each of the four times repeated signals ACK/NACK may multiplicious using a different or similar orthogonal code, so in this case, these signals can be of various signals with respect to each other. But for ease of explanation, this differentiating each repeated signal will be ignored in the whole context.

Figure 6 presents the case when for transmitting signals ACK/NACK are single OFDM-symbols. Case of using a single OFDM symbol is only an example for describing the present invention. And the present invention is also applicable to the case of multiple OFDM symbols.

the particular in the case where the ACK/NACK is transmitted by using multiple OFDM symbols, the repetition along the time axis is also applicable, as the repetition along the frequency axis for additional explode, and explode the transmitting antenna.

Hereinafter in the description deals with the case of using a number of OFDM symbols for transmitting signals ACK/NACK.

In the case of OFDM symbols for transmitting signals ACK/NACK increase, it is possible to use the signals ACK/NACK, in the case of a single OFDM symbol for re-transmitting the signals ACK/NACK can be reused without modification for enhanced OFDM symbols. In this case, since the OFDM symbols used for transmitting signals ACK/NACK increased, it is possible to use more power to transmit signals ACK/NACK. Therefore, it is possible to transmit signals ACK/NACK in the wider area of the cell.

Figure 7 presents the scheme in accordance with one embodiment of the present invention, intended to explain the method of signaling ACK/NACK in case of using at least 2 zones OFDM symbol for transmitting signals ACK/NACK.

Figure 7 presents a method of signaling ACK/NACK when the number of OFDM symbols for transmitting signals ACK/NACK is increased by 2 times, when transmitting signals ACK/NACK, which has the same coefficient is ecient extensions as figure 6.

In particular, figure 7 shows the case in which the structure using a single OFDM symbol for transmitting signals ACK/NACK like 6 unchanged and repeatedly applied to the second OFDM-symbol.

In the case of transmission using the above-described structure, even if the number of characters is increased, the number of signals ACK/NACK, which can be transmitted, is equal to the number of signals for the case of using a single OFDM symbol. This is due to the fact that you are using more frequency-time resources for transmission of the same number of signals ACK/NACK due to the significant increase in the number of repetitions in the frequency-time domain, as more OFDM symbols is used to signal the ACK/NACK that is repeated along the frequency axis only in the case of a single OFDM symbol.

In the case of performing transmission using this method for signaling ACK/NACK can be allocated more power, but it may be that resources are spent in vain. If for transmitting signals ACK/NACK is used more OFDM symbols with the aim of reducing unnecessary expenditure of resources, if the transfer is done by reducing the number of repetitions on the axis of frequency for OFDM-symbol, the same frequency-time domain, as in the case of one OFDM symbol, can the t to be busy. Therefore, it is possible to use resources more efficiently.

On Fig the scheme in accordance with one preferred embodiment of the present invention, intended to explain the method of signaling ACK/NACK in the case of using at least 2 zones OFDM symbol.

On Fig presents an example in which resources are used more efficiently by reducing the number of repetitions along the frequency axis signals ACK/NACK, multiplexing using CDMA in the case when the number of OFDM symbols for transmitting signals ACK/NACK is increased by two.

Despite the fact that the signals ACK/NACK repeated twice, compared with four times figure 6, as the number of OFDM symbols used for transmitting signals ACK/NACK increases, the use of four areas of time-frequency resource is the same as in the case of one OFDM symbol.

Compared to Fig.7, which shows the case of performing transmission by applying the same signal structure ACK/NACK for all OFDM-symbols on the assumption that you are using the same time-frequency resource, Fig shown that signaling ACK/NACK can be performed twice. Consequently, it is possible to more efficiently use resources.

In comparison with 7, because the quantity of irradiation of the TEI of time-frequency resource, used for signaling ACK/NACK, decreases the signal power for signal transmission, the ACK/NACK may be less. However, since all the signals ACK/NACK is transmitted through a frequency-time domain, it is possible a more efficient allocation of capacity on the character than in the case of signaling ACK/NACK using only one OFDM symbol.

As shown in Fig, when in accordance with the embodiment of the present invention to transmit ACK/NACK using multiple zones OFDM symbol, in case when using the transfer method of a specific ACK/NACK signal through different frequency region in each zone OFDM symbol, the more advantageous is the fact that the power distribution for each ACK/NACK can be performed more flexibly than in the way the signal is transmitted ACK/NACK through a variety of frequency ranges within each zone OFDM symbol. Next, it is explained in detail with reference to Fig.9.

Figure 9 presents a diagram intended to explain the principle, allowing to increase the flexibility of power distribution in the case of signaling ACK/NACK using a variant of implementation of the present invention, presented at Fig.

On the species (a) and (b) figure 9 characters a1And2And3and a4denote the group of signals ACK/NACK, multiplexing, respectively, using CDMA. In particular, the IDA (a) figure 9 shows the format, in which the signals ACK/NACK, multiplexity using CDMA, is transmitted by repetition in different frequency regions within the same zone symbol. And (b) Fig.9 shows the format in accordance with the present embodiment, in which the signals ACK/NACK, multiplexity using CDMA, is transmitted by repetition in different frequency regions within the various zones of characters.

In the case when the signals ACK/NACK is transmitted in the same manner as the method shown in (a) figure 9, all power allocated to the respective zones of the OFDM symbol must be made by allocating to two ACK/NACK. On the contrary, in the case when the signals ACK/NACK is transmitted in the same manner as the method shown in (b) figure 9, all power allocated to the respective zones of the OFDM symbol may be allocated by allocating to four ACK/NACK. Therefore, the flexibility of power distribution can be more increased as compared with the case presented in the form of (a) Fig.9.

In other words, when multiple zones OFDM symbol is available for the transmission symbols of the ACK/NACK, as in the present embodiment, in the case when the signals ACK/NACK are transmitted through different frequency region in different OFDM symbols, the flexibility of power distribution increases to diversify the distribution of power and the spine of the signals ACK/NACK to the user.

In the above embodiment of the present invention, the coefficient of expansion for multiplexing multiple signals ACK/NACK, the number of repetitions in the frequency-time domain and the number of OFDM symbols for transmitting signals ACK/NACK are estimated for an exact explanation of the present invention, but the present invention is applicable to other coefficients of expansion, other number of repetitions and different number of OFDM symbols.

In the above example to explain the present invention in accordance with a frequency-time resource presents a case of using only one transmitting antenna that does not use antenna diversity when transmitting. In the alternative case, the present invention is also applicable to the case of using the scheme explode two or four antennas.

To a person skilled in the art it will be obvious that, in accordance with one embodiment of the present invention can be used in the above-described one win from time-frequency diversity when transmitting signals ACK/NACK simultaneously with the scheme of using FDMA or TDMA, and in the case of CDMA for multiplexing multiple signals ACK/NACK.

The above scheme of multiplexing and signaling ACK/NACK in the same way PR is important to the scheme of multiplexing and transmission of multiple signals power control, transmitted in the downstream direction at different units of the user equipment. In particular, the downward signal ACK/NACK and the downward control signal power can be transmitted by multiplexing in the same frequency-time domain using CDMA.

In addition, the above scheme, multiplexing and signaling ACK/NACK similarly applicable to the transmission of signals ACK/NACK in the uplink direction, as well as for data packets transmitted in the downstream direction.

In addition, if the number of OFDM symbols used for transmitting signals ACK/NACK may, in a particular system to be variable, preferably, when the number of repetitions of the signals ACK/NACK decreases in accordance with increase of the used OFDM symbols.

INDUSTRIAL APPLICABILITY

In accordance with one embodiment of the present invention for multiplexing multiple 1-bit control signals, the set of control signals of a specific user equipment can be transmitted using orthogonal and pseudoorthogonal codes that differ from each other, using mainly CDMA. Therefore, the present invention improves the reliability of transmission of the corresponding control signals.

And the frequency and/or the temporary raznesenii what can be done by applying FDMA and/or TDMA when the simultaneous transmission of 1-bit control signals and through distribution in order to transfer multiple control signals for a specific user equipment for each time-frequency region.

In addition, in the case of the 1-bit control signal through the multiple frequency and time fields by specifying to use the orthogonal code used for transmission in accordance with the size of all frequency-temporal areas, and not in accordance with the size of each of the frequency-temporal areas, you can increase the number of control signals that can be transmitted simultaneously.

In addition, in the case when to transmit 1-bit control signals using multiple OFDM symbols by passing the modulated using CDMA 1-bit control signal in another area OFDM symbol through another frequency domain it is possible to perform efficient transmission aspects of resource efficiency and gains from explode. And also the distribution of power within each region OFDM symbol can be made more flexible.

Accordingly, a method of transmitting control information in accordance with the present invention has a configuration suitable for use in the 3GPP LTE system (terminal equipment data line with the common Protocol packet). Furthermore, the method of transmitting control information in accordance with the present invention is also applicable to systems 3GPP LTE and production is determined as being communication systems, require specification of the format for the transmission of control information within the time-frequency region.

Although the present invention has been here discussed and illustrated with reference to the preferred embodiments of, to a person skilled in the art it will be obvious that the present invention can be made of various modifications and changes do not go beyond the nature and scope of this invention. Thus, it is assumed that the present invention covers the modifications and changes to this invention, which are within the scope of the attached claims and their equivalents.

1. A method of transmitting a control signal, comprising: multiplexing multiple 1-bit control signals within a given frequency-time domain using schemes multiple access code division (CDMA), the set of 1-bit control signals produce by using orthogonal or pseudoorthogonal codes used for multiplexing each of the 1-bit control signals; repeating multiplexed control signals in different frequency regions; and the re-transmission of control signals.

2. The method according to claim 1, wherein in the case where BP is the transitional region, used for transmission of the control signal contains an area of one OFDM symbol, the repetition of the multiplexed control signals is carried out by repetition of the multiplexed control signals in different frequency region within the zone of one OFDM symbol.

3. The method according to claim 1, wherein when the temporary area used for transmission of the control signal, contains many areas of OFDM symbols, the repetition of the multiplexed control signals is carried out by repetition of the multiplexed control signals in different frequency areas within the zones of OFDM symbols, different from each of the specified multiple zones OFDM symbols.

4. The method according to claim 1, wherein when the multiplexing additionally inject a lot of 1-bit control signals using different component orthogonal phases.

5. The method according to claim 1, wherein a set of 1-bit control signals includes signals ACK/NACK.

6. A method of transmitting a control signal, comprising: multiplexing multiple 1-bit control signals within a given frequency-time domain using schemes multiple access code division; additional multiplexing multiplexed multiple 1-bit control signals using at least CX is we multiple access with time division (TDMA) or schemes multiple access frequency division (FDMA), what multiplexed multiple 1-bit control signals, repeat inside additional frequency-time domain that is different from the predetermined frequency-time domain; and transmitting the multiplexed control signals.

7. The method according to claim 6, in which 1-bit control signals for the various transmitting parties multiplexer within a given time-frequency region and a frequency-time domain using, respectively, schemes multiple access code division.

8. The method according to claim 6, in which 1-bit control signal for a particular transferor multiplexers other 1-bit control signals using different orthogonal or pseudoorthogonal codes, with multiplexed 1-bit control signal for a particular transferor repeat within the additional frequency-time domain that is different from the predetermined frequency-time domain, and re-transmit 1-bit control signal for a particular transferor.

9. The method according to claim 8, in which orthogonal or pseudoorthogonal code contains a code sequence, the length of which corresponds to the size of a given frequency-time domain.

10. The method according to claim 6, wherein a set of 1-bit control signals signal contains the crystals ACK/NACK.



 

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