A method for transmitting control channel in a mobile communication system

“METHOD OF TRANSMITTING A UPLINK CHANNEL SIGNAL INTO A RADIO ACCESS SYSTEM”

Technical Field

The present invention relates to a mobile communication system, and more particularly to a method for transmitting a control channel in a mobile communication system.

Basis of the Technique

In uplink transmission, that is, in the case where a user equipment works as a transmitter, several methods to control the power such as the capacity of a battery is increased or the energy consumption of the user equipment is decreased to increase the duration of the user equipment have been suggested. Examples of methods for controlling power may include a discontinuous transmission scheme.

The discontinuous transmission scheme can be, for example, a method to instantly reduce a data transmission output or adjust a silent state when a voice signal is not transmitted on a mobile phone or a portable cordless phone. When two people talk on the phone, the talk time for each of the two people is equal to or less than half of the total talk time. Thus, if the connection to a transmitter is established only during a voice input time, a transmission time can be reduced to 50% or less. In this way, the advantages including conserving battery power, reducing the load on a transmitter amplifier, and sharing the channel with another signal due to time division multiplexing (TDM) can be obtained.

Description of the Invention

Thus, the present invention is directed to a method for transmitting a control channel in a mobile communication system that substantially prevents one or more problems due to the limitations and disadvantages of the related technique.

An object of the present invention designed to solve the problem is in a method for transmitting a control channel in a mobile communication system.

The object of. the present invention can be achieved by providing a method for transmitting a first channel and a second channel in a scheme

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2/15 compressed mode transmission of the mobile communication system, the method comprising: if a transmission interval of a preamble and a post-scope of the first channel partially overlaps a compressed mode gap, transmission of the first channel in a remaining transmission interval excluding the compressed mode gap from a transmission interval of the first channel , and transmission of the second channel, of which the first channel includes information for detection, at a predetermined time, after the transmission of the first channel is initiated, wherein the system uses a discontinuous transmission scheme (DTX) and a compressed mode transmission scheme.

In the aspect of the present invention, the first channel can be a dedicated physical control channel (DPCCH), and the second channel can be any expanded dedicated channel (E-DCH) and a dedicated high speed physical control channel (HS- DPCCH).

In the aspect of the present invention, the first channel signal and the second channel signal can be multiplexed using different codes or different orthogonal phase components.

In the aspect of the present invention, the first channel and the second channel cannot be transmitted, if the preamble of the second channel is a preamble of long length including the control information to perform the synchronization and the power control.

In the aspect of the present invention, each of the first channel and second channel may include a DTX interval where a signal is not transmitted according to the discontinuous transmission scheme.

The object of the present invention can be achieved by providing another method for transmitting a convole channel, the method comprising: if a transmission interval for a control channel preamble partially overlaps a compressed mode gap in a compressed transmission mode, transmission of the control channel preamble in a remaining transmission interval excluding the compressed mode gap from the transmission interval, and transmission of the control channel and an expanded channel of which the control channel includes information used for detection, where each control channel and the expanded channel include a DTX range.

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3/15

In another aspect of the present invention, the expanded channel is a dedicated expanded channel (E-DCH) and the control channel is a dedicated physical control channel (DPCCH).

Advantageous Effects

According to an embodiment of the present invention, it is possible to increase the efficiency of a mobile communication system. In addition, although transmission errors occur and a portion of a transmission unit cannot be transmitted, the remaining signal is transmitted. Thus, it is possible to prevent the waste of transmission resources and to execute a more efficient resource programming. The error occurred is corrected and detected by an error detection correction method applied to the channel to increase the probability of success of the transmission / reception, thus increasing efficiency.

Brief Description of Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, illustrate the modalities of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is a drawing to illustrate a compressed mode transmission scheme;

FIG. 2 is a drawing to illustrate a dedicated expanded channel (E-DCH) discontinuous transmission operation;

FIG. 3 is a drawing to illustrate the operation of user equipment in accordance with an embodiment of the present invention, when the compressed mode transmission scheme and discontinuous transmission scheme are applied simultaneously in the transmission of the E-DCH;

FIG. 4 is a drawing to illustrate the operation of a user equipment according to another embodiment of the present invention when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously in the transmission of the E-DCH;

FIG. 5 is a drawing to illustrate the operation of user equipment in accordance with another embodiment of the present invention, when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously to the E-DCH Transmission;

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4/15

FIG. 6 is a drawing to illustrate a discontinuous transmission operation of a dedicated high-speed physical control channel (HSDPCCH);

FIG. 7 is a drawing to illustrate the operation of user equipment in accordance with an embodiment of the present invention, when the compressed mode transmission scheme and discontinuous transmission scheme are simultaneously applied to the transmission of the HS-DPCCH; and

FIG. 8 is a drawing to illustrate the operation of user equipment in accordance with another embodiment of the present invention when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously in the transmission of HS-DPCCH.

Best Mode for Carrying Out the Invention

In the following, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention will be more fully understood from the detailed description provided below and the accompanying drawings which are given by way of illustration only, and does not limit the present invention. The following detailed description includes details in order to provide a complete understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be incorporated without the details. For example, in the following description, specific terms are used, but the present invention is not limited to these terms.

In some cases, known structures and devices are omitted in order to avoid ambiguity in the concept of the present invention or the main functions of the structures and devices are shown in a block diagram and / or a flow chart. The same reference numbers will be used in all drawings to refer to the same or similar parts.

FIG. 1 is a drawing illustrating a compressed mode transmission scheme.

FIG. 1 shows a structure of; schematic picture according to the compressed mode transmission scheme. According to the compressed mode transmission scheme, either one frame or two continuous frames is used as a compressed frame including the compressed mode (CM) gap in one frame or between two continuous frames. That is,

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5/15 some slits in a frame that are determined to be used as the compressed frame, that is, slits included in the CM gap, are not used in data transmission. These slots are used to perform an operation to interrupt the transmission / reception of data in the CM gap and the search for a neighboring cell and a neighboring network.

In order to reduce the influence of a gain in p reduced weight due to the existence of the CM gap and to maintain the quality of the communication, the data can be transmitted in a power state of: increasing transmission with respect to some cracks in the compressed frame. As shown in FIG. 1, slots for data transmission with increased transmission power are preferably found before the CM gap is initiated and after the CM gap is closed. The amount of increased power in some cracks in the compressed frame can be determined by reducing the transmission time. Examples of a factor for measuring communication quality may include a bit error rate (BER) and a frame error rate (FER).

In a network, it can be determined which frame is used as the compressed frame. The compressed frame can be generated periodically in the compressed mode and can be generated by an order if necessary. The rate and type of the compressed frame can be determined by the requirements due to the various environments and measures of the channel.

Then, a uplink discontinuous transmission (DTX) scheme will be described as another method for controlling power. In a communication system, to reduce the energy consumption of a user equipment battery and to increase the capacity of the uplink channel, a batch transmission operation is designed for uplink transmission. That is, the user equipment discontinuously transmits the data. By virtue of user equipment, a method for differently controlling power according to an interval in which data is transmitted and an interval in which data is not transmitted, that is, the DTX interval, is used.

For example, if the DTX interval is used, data is not always transmitted. Thus, when data is transmitted, the user equipment is in a state of use or in a state ON, and when data is not transmitted, the user equipment is in a state of use.

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6/15 energy consumption minimizing state, such as a STANDBY state or an OFF state.

If the uplink discontinuous transmission scheme and the compressed mode transmission scheme are operated simultaneously, a precise operation of the user equipment is preferably examined. Next, the operation of the user equipment according to the modalities of the present invention when the uplink compressed mode transmission scheme and the uplink discontinuous transmission scheme are applied simultaneously will be described in detail.

First, the operation of the user equipment associated with the expanded dedicated channel (E-DCH), according to an embodiment of the present invention will be described.

FIG. 2 is a drawing to illustrate a discontinuous transmission operation of the E-DCH.

Referring to FIG. 2, the E-DCH is a channel for transmitting uplink data packets and is mapped to a physical channel, such as an expanded dedicated physical data channel (E-DPDCH) and an expanded dedicated physical control channel (E -DPCCH). The E-DPDCH is the physical channel that is used to transmit data from the E-DCH and the E-DPCC is the physical channel that is used to transmit control information associated with the E-DCH. In general, E-DPDCH and E-DPCCH are transmitted simultaneously.

When E-DCH is transmitted via E-DPDCH and E-DPCCH, to allow for a receiving side, for example, a B-node, to easily perform E-DCH demodulation using E-DCH detection or estimation channel, a dedicated physical control channel (DPCCH) is also transmitted. More specifically, the information generated in a first layer is transmitted through the DPCCH. For example, at least one feedback information (FBI), transmitted power control command (TPC) and transport format combination indicator (TFCI), including an uplink pilot to support channel estimation can be transmitted.

However, the control information that is not transmitted through the DPCCH, that is, the control information that is characteristic in the E-DCH, can be transmitted through the E-DPCCH as control information used in the demodulation of the E-DCH. For example} TFC [, HARQ information and

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7/15 schedule request information can be transmitted via EDPCCH. At this time, E-DPDCH, E-DPCCH and DPCCH can be transmitted simultaneously and are multiplexed using different codes or different orthogonal phase components.

As shown in FIG. 2, the user equipment starts transmitting the DPCCH before transmitting the E-DPDCH and E-DPCCH. In other words, the transmission of the E-DPDCH and E-DPCCH is started at a predetermined time after the DRCCH transmission is started, or after a predetermined number of slots are transmitted. The DPCCH signal that is transmitted before the E-DPDCH and E-DPCCH are transmitted is called a DPCCH preamble. FIG. 3 shows a case where two slits are used as the preamble of the DPCCH. Next, the number of slots used as a preamble to the DPCCH is denoted by N.

The user equipment transmits the DPCCH at a predetermined time, after the transmission of the E-DPDCH and E-DPCCH is completed or after a predetermined number of slots is transmitted and then completes the transmission process of the E-DCH. The DPCCH signal that is transmitted after the transmission of the E-DPDCH and E-DPCCH is completed is called a DPCCH post-scope. FIG. 2 shows a case where a slit is used as the DPCCH post-scope. Next, the number of slits used as the DPCCH post-scope is denoted by M.

As described above, the preamble of the DPCCH and the post-scope of the DPCCH are transmitted, respectively, before and after the E-DPDCH and EDPCCH are transmitted such that the receiving side, for example, the B-node detects the EDCH, most likely to succeed.

In the preamble of the DPCCH, the number of slots used as the preamble of the DPCCH can be determined according to the data transmission status of the user's equipment. For example, if the user does not transmit the data for a longer time than a predetermined time interval before transmitting the E-DCH, more slots can be used as the preamble of the DPCCH, compared to a case where the user does not transmit the data during the predetermined time interval, or less.

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If the user does not transmit the data during the predetermined time interval or less, the number of slots Ni used as the preamble of DPCCH can be 2. In contrast, if the user does not transmit the data for a longer time than the interval of predetermined time, the number of slots N2 used as the preamble of the DPCCH can be 15. This is because, if the data is not transmitted for a longer time, it is preferable that the control information necessary for the uplink synchronization is transmitted and more control information necessary to perform the power control is transmitted.

As shown in FIG. 2, in the transmission of the DPCCH, as described above, the preamble of the DPCCH is transmitted by a predetermined number N of slots, for example, two slots, before transmitting the E-DPDCH and EDPCCH, and the DPCCH post-scope is transmitted by a predetermined M number clan slits, for example, a slit, after the transmission of E DPDCH and E-DPCCH. A transmission process of the DPCCH preamble, transmission of the E-DPDCH and E-DPCCH, and transmission of the DPCCH post-scope is considered as a transmission unit. A transmission unit shown on the left side of FIG. 2 is referred to as a first transmission unit and a transmission unit shown to the right of FIG. 2 is referred to as a second transmission unit.

In this case, a predetermined DTX interval can be adjusted between the first transmission unit and the second transmission unit. The data is not transmitted in the DTX range. If the DTX interval ends, the preamble of the DPCCH is transmitted again, the E-DCH, that is, the EDPDCH and EDPCCH, is transmitted, and the DPCCH post-scope is transmitted, thus completing the data transmission of a transmission unit.

Now, a method for the transmission of the E-DCH by the user equipment when the batch transmission scheme and the compressed mode transmission scheme of the E-DCH are applied simultaneously will be described.

FIG. 3 is a drawing to illustrate the operation of the user equipment according to one embodiment of the present invention, when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously in the transmission of the E-DCH.

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As described above, for E-DCH transmission, E-DPDCH and E20 DPCCH are transmitted and DPCCH is transmitted together with EDPDCH and E-DPCCH. The DTX interval, according to the discontinuous transmission scheme, exists between the first transmission unit that is transmitted first and the second unit, which is the next transmitted.

That is, the transmission of data corresponding to the first transmission unit is completed and, after the DTX interval, the transmission of data corresponding to the second transmission unit is initiated, transmitting the preamble of the DPCCH.

At this point, as shown in FIG. 3, if a portion of the DPCCH preamble of the second transmission unit is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH preamble is not transmitted in one portion or all cracks overlapping the CM gap, the E-DPDCH and E-DPCCH as well as the preamble of the remaining DPCCH, b signal of the DPCCH and the post-scope of the DPCCH are transmitted, according to the embodiment of the present invention. If the DPCCH post-scope is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH post-scope is not transmitted from a portion or all of the cracks overlapping the CM, but the E- DPDCH and E-DPCCH as well as the preamble of DPCCH, the DPCCH signal and post-scope of the remaining DPCCH are transmitted.

This is because an error check sum (ECS), for error verification can be used in the E-DCH data, a HARQ operation is performed, and the deterioration of the reception capacity due to the lack of the preamble of the DPCCH and post-scope of the DPCCH on the receiving side can be easily recovered, although at least one of the DPCCH's preamble and DPCCH post-scope is determined to be transmitted in the CM gap and cannot be transmitted.

FIG. 4 is a drawing to illustrate the operation of the user equipment according to another embodiment of the present invention, when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously in the transmission of the E-DCH.

If the user equipment does not transmit the data for a period of time longer than the predetermined time interval, such as

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10/15 shown in FIG. 4, the number of slots N2 used as the preamble of the DPCCH can be adjusted to. This is because, as described, if the data is not transmitted for the longest time, it is preferable that the control information necessary for the uplink synchronization is transmitted and more control information necessary for carrying out power control is transmitted.

In the present embodiment, similar to the embodiment of FIG. 3, if a portion of the long-length DPCCH preamble is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the long-length DPCCH preamble is not transmitted in one portion or all overlapping slits the CM gap, but the EDPDCH and E-DPCCH as well as the preamble of the remaining DPCCH, the DPCCH signal and the DPCCH post-scope are transmitted, according to the embodiment of the present invention.

Likewise, if the DPCCH post-scope is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH post-scope is not transmitted in one portion or all cracks overlapping the gap. of the CM, but the E-DPDCH and E-DPCCH as well as the preamble of the DPCCH, the signal of the DPCCH and the post-scope of the remaining DPCCH are transmitted.

FIG. 5 is a drawing to illustrate the operation of the user equipment according to another embodiment of the present invention, when the compressed mode transmission scheme and the batch transmission scheme are applied simultaneously in the transmission of the E-DCH.

In the present embodiment, unlike the modalities shown in Figs. 3 and 4, if a portion of the preamble of the long-length DPCCH is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH and the remaining channel signals of the total transmission unit associated with the preamble of the long-length DPCCH, as well as the cracks overlapping the gaps of the CM are not transmitted according to the present Fia modality. That is, all the remaining DPCCH preambles, the DPCCH signal, the DPCCH post-scope, the E-DPDCH and E-DPCCH are not transmitted.

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11/15

Likewise, if the DPCCH post-scope is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH and the remaining channel signals from the total transmission unit associated with the DPCCH preamble; as well as the cracks overlapping the CM gap are not transmitted according to the embodiment of the present invention. That is, all DPCCH preambles, DPCCH signal, remaining DPCCH post-scope, E-DPDCH and E-DPCCH are not transmitted.

The control information for the uplink synchronization and the control information required for the power control are transmitted through the preamble of the long-length DPCCH transmitted after the data is not transmitted during the predetermined time interval. Thus, if the preamble of the long-length DPCCH is not normally received, it is difficult to establish the uplink synchronization. In this case, a fatal error can occur in the transmission / reception of data.

Then, the operation of user equipment associated with the discontinuous transmission of a dedicated high-speed physical control channel (HS-DPCCH) will be described as a modality of the present invention.

FIG. 6 is a drawing to illustrate a discontinuous transmission operation of the HS-DPCCH.

The HS-DPCCH sends an uplink return signal associated with the transmission of the shared high-speed downlink channel (HS-DSCH). The return signal associated with the HS-DSCH includes a HARQ recognition (ACK / NACK) and a channel quality indication.

When HS-DPCCH is transmitted, similar to EDCH, in order to allow the receiving side, for example, the B-node, to easily perform E-DCH demodulation using E-DCH detection or channel estimation, DPCCH is also transmitted. That is, the control information for the power control and the necessary control information, including a pilot for the channel estimation can be transmitted through the DPCCH. At this time, HSDPCCH and DPCCH can be transmitted simultaneously and are multiplexed using different codes or different orthogonal phase components.

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As shown in FIG. 6, the user equipment starts to transmit the DPCCH before transmitting the HS-DPCCH. That is, the HSDPCCH transmission starts at a predetermined time, after the DPCCH transmission is initiated or a predetermined number of slots are transmitted. The DPCCH signal that is transmitted before the HS-DPCCH is transmitted is called the DPCCH preamble. FIG. 6 shows a case where two slits are used as the preamble of the DPCCH. Next, the number of slots used as the preamble of the DPCCH is denoted by N.

The user equipment transmits the DPCCH at a predetermined time, after the transmission of the HS-DPCCH is completed or after a predetermined number of slots are transmitted and then completes the transmission process of the HS-DPCCH. The DPCCH signal that is transmitted after the HS-DPCCH transmission is completed is called the DPCCH post-scope. FIG. 6 shows a case where a slit is used as a post-scope of the DPCCH. Next, the number of slits used as DPCCH post-scope is denoted by M.

As described above, the DPCCH preamble and the DPCCH post-scope are transmitted, respectively, before and after the HS-DPCCH is transmitted so that the receiving side, for example, the B-node detects the HSDPCCH most likely. Of success.

As shown in FIG. 6, in the transmission of the DPCCH, as described above, the preamble of the DPCCH is transmitted by the predetermined number N of slots, for example, two slots, before the transmission of the HS-DPCCH and the post-preamble of the DPCCH is transmitted by the predetermined number of slots M , for example, a slit, after the transmission of the HS-DPCCH.

A process of transmitting the preamble of the DPCCH, transmitting the HS-DPCCH, and transmitting the DPCCH is considered to be a transmission unit. A transmission unit shown on the left side of FIG. 6 is referred to as a first transmission unit and a transmission unit shown to the right of FIG. 6 is termed as a: second transmission unit.

In this case, a predetermined DTX interval can be adjusted between the first transmission unit and the second transmission unit and the data is not transmitted in the DTX interval. If the DTX range is

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13/15 finished, the preamble of the DPCCH is transmitted again, the DPCCH and HSDPCCH are transmitted, and the post-scope of the DPCCH is transmitted, thus ending the data transmission from a transmission unit.

At this time, compared to the discontinuous transmission scheme of the E-DCH, while the E-DPDCH and E-DPCCH are transmitted from a slot immediately next to two slots, in which the preamble of the DPCCH is transmitted, in the transmission scheme discontinuous of the E-DCH, the HSDPCCH is transmitted from a middle portion of a slot immediately next to the slot, in which the preamble of the DPCCH is transmitted, in the discontinuous transmission scheme of the HS-DPCCH as shown in FIG. 6.

Even in the post-scope transmission of the DPCCH, while the EDPDCH and E-DPCCH are transmitted to a slot immediately before a slot, in which the DPCCH post-scope is transmitted, in the E-DCH discontinuous transmission scheme, the HS-DPCCH is transmitted to a middle portion of a slot just before a slot, in which the DPCCH post-scope is transmitted, in the HSDPCCH discontinuous transmission scheme as shown in FIG. 6.

Now, a method for the transmission of the HS-DPCCH by the user equipment when the discontinuous transmission scheme and the compressed mode transmission scheme of the HS-DPCCH are applied simultaneously will be described.

FIG. 7 is a drawing to illustrate operation of user equipment according to one embodiment of the present invention, when the compressed mode transmission scheme and the discontinuous transmission scheme are applied simultaneously in the transmission of the HS-DPCCH.

As described above, for the transmission of the HS-DPCCH, the HS-DPCCH is transmitted and the DPCCH is transmitted together with the HS-DPCCH. The DTX interval according to the discontinuous transmission scheme exists between the first transmission unit that is transmitted first and the second transmission unit that is the next transmitted.

That is, the transmission of data corresponding to the first transmission unit is completed and, after the DTX interval, the transmission of data

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14/15 corresponding to the second transmission unit is initiated by the transmission of the preamble of the DPCCH.

At that time, if a portion of the DPCCH preamble of the second transmission unit is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the IO DPCCH preamble is not transmitted in one portion or all overlapping slits the gap CM gap, but the HS-DPCCH as well as the preamble of the remaining DPCCH, the signal of the DPCCH and the post-scope of the DPCCH are transmitted, according to the embodiment of the present invention.

If the DPCCH post-scope is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH post-scope is not transmitted in one portion or all cracks overlapping the CM gap, but the HS-DPCCH as well as the preamble of the DPCCH, the signal of the DPCCH and the post-scope of the remaining DPCCH are transmitted.

FIG. 8 is a drawing to illustrate the operation of user equipment according to another embodiment of the present invention, when the compressed mode transmission scheme and the discontinuous transmission scheme are applied simultaneously in the transmission of the HS-DPCCH.

In the present embodiment, unlike the embodiment shown in FIG. 7, if a portion of the DPCCH preamble is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH and the remaining channel signals from the total transmission unit associated with the DPCCH preamble, as well as the cracks overlapping the CM gap are not transmitted according to the embodiment of the present invention.

Likewise, if the DPCCH post-scope is determined to be transmitted in the CM gap according to the compressed mode transmission scheme, the DPCCH and the remaining channel signals from the total transmission unit associated with the DPCCH preamble, as well as the cracks overlapping the CM gap are not transmitted according to the embodiment of the present invention. That is, all DPCCH preambles, DPPCCH signal, remaining DPCCH preamble and HS-DPCCH are not transmitted.

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This is because the ECS to check the error cannot be applied to the HS-DPCCH data and the HARQ operation cannot be performed. Thus, if at least one preamble of the DPCCH and post-scope of the DPCCH is transmitted in the CM gap and therefore cannot be transmitted, a probability of 5 deterioration in the reception capacity, due to the lack of the preamble of the DPCCH and post- DPCCH scope on the receiving side is high.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention encompasses the 10 changes and variations of the present invention, as long as they are within the scope of the attached claims and their equivalents. Although the examples that are applied when the E-DPDCH / E-DPCCH and HS-DPCCH are transmitted together with the DPCCH are described in the modalities described above, it will be apparent to those skilled in the art that a method equal to or similar to the transmission method described in the present specification can be used with respect to various other channel signals.

The present invention is not limited to the modalities described herein and includes a wide range, including the principles and characteristics described herein.

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