KR100957339B1 - An apparatus and method for transmitting control informations of enhanced uplink dedicated transport channel in wcdma communication system - Google Patents

Abstract

The present invention provides an apparatus and method for efficiently transmitting an uplink control channel to improve a reverse dedicated transport channel in an asynchronous code division multiple access mobile communication system. The present invention includes generating the subframe to include the data rate when the transmission of packet data through the enhanced reverse dedicated transport channel is required, to include the channel status information at predetermined intervals, and to include the transmission format information. Characterized in that the transmission to the base station. Therefore, it is possible to reduce uplink interference between mobile terminals and to reduce power consumption of each mobile terminal.

Wide-band Code Division Multiple Access (WCDMA), Enhanced Up-link Dedicated Transport Channel (EUDCH), Data Rate Request (DRR), Transmission Power (TxP), Transport Format and Resource related Information (TFRI)

Description

An apparatus and method for transmitting an uplink control channel in an asynchronous code division multiple access mobile communication system serving an enhanced uplink dedicated transport channel.             

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for conceptually explaining a service of an enhanced uplink dedicated transport channel in an asynchronous code division multiple access mobile communication system.

2 is a diagram illustrating a signaling procedure between a base station and a mobile terminal for enhanced reverse dedicated transport channel service in an asynchronous code division multiple access mobile communication system.

3 is a diagram showing the structure of the EU-DPCCH.

4 is a diagram illustrating examples in which control information is time-divided and transmitted through EU-DPCCH in a predetermined transmission time interval.

FIG. 5 is a diagram illustrating a first embodiment of a reverse control information channel transmitted through an uplink by a mobile terminal supporting an enhanced reverse dedicated transport channel according to the present invention.

FIG. 6 is a diagram schematically showing an internal configuration of a mobile terminal according to the control information channel shown in FIG.                 

7 is a flowchart showing the operation of the internal structure of the mobile terminal shown in FIG.

FIG. 8 illustrates a second embodiment of a reverse control information channel transmitted by a mobile station supporting an enhanced reverse dedicated transport channel through uplink according to the present invention; FIG.

9 is a flowchart showing the operation of the internal structure of the mobile terminal shown in FIG.

FIG. 10 illustrates a third embodiment of a reverse control information channel transmitted by a mobile station supporting an enhanced reverse dedicated transport channel through uplink according to the present invention; FIG.

FIG. 11 is a diagram schematically illustrating an internal configuration of a mobile terminal according to the control information channel shown in FIG. 10.

12 is a flowchart showing the operation of the internal structure of the mobile terminal shown in FIG.

The present invention relates to an apparatus and method for scheduling a base station in an asynchronous code division multiple access mobile communication system for servicing an enhanced uplink dedicated transport channel. In particular, an apparatus for time-dividing control information necessary for scheduling by a mobile station and transmitting the same to the base station; It is about a method.                         

Typically, the data rate for the reverse channel is determined by the mobile terminal within an upper limit of a predetermined possible data rate, and the upper limit of the data rate is determined by the radio network controller (hereinafter referred to as "RNC"). It is provided to the terminal. That is, the data rate for the existing reverse channel has not been adjusted by the base station (hereinafter referred to as "Node B"). However, for the enhanced uplink dedicated transport channel (hereinafter referred to as "EUDCH"), whether to transmit uplink data and an upper limit of the available data rate may be determined by the Node B. The determined information is transmitted as a scheduling command to the mobile station, and the mobile station determines a data rate to be used for the EUDCH according to the scheduling command. The EUDCH is a reverse channel proposed to improve the performance of reverse packet transmission in an asynchronous code division multiple access mobile communication system.

As described above, reverse signals transmitted from different mobile terminals through reverse channels act as interference with each other. This implies that as the number of reverse signals received by the Node B increases, the amount of interference with respect to the reverse signal from a specific mobile terminal also increases, thereby deteriorating reception performance. This problem can be solved by increasing the transmit power of a particular reverse channel. However, if the transmission power is increased for a specific reverse channel, this causes interference with signals transmitted through other reverse channels, resulting in a decrease in reception performance.

If the scheduling is not performed for the EUDCH packet transmission as described above, when several mobile terminals simultaneously transmit a high data rate packet at a specific point in time, the reception performance of signals received through the reverse channel cannot be guaranteed. May occur.

FIG. 1 is a diagram conceptually illustrating a service of an enhanced uplink dedicated transport channel in an asynchronous code division multiple access mobile communication system.

Referring to FIG. 1, Node B 100 is one of active Node Bs supporting packet data service through EUDCH, and mobile terminals 101, 102, 103, and 104 transmit packet data through EUDCH to Node B 100. These are mobile terminals that transmit. Reference numerals 111, 112, 113, and 114 denote EUDCHs transmitted by the mobile stations 101, 102, 103, and 104 at the data rate determined by the Node B scheduling.

In general, when the data rate used for the mobile terminal is high, the reception power of the Node B is increased due to the signal received from the mobile terminal. On the other hand, when the data rate used for the mobile terminal is lowered, the reception power of the Node B is reduced due to the signal received from the mobile terminal. This is because the signal from the mobile station using the high data rate has a large influence on the increase of the measurement noise of the base station, and the signal from the mobile terminal using the relatively low data rate is the increase in the measurement noise of the base station. Takes a small part. In other words, as the data rate increases, the portion occupying the uplink radio resource increases. Considering the relationship between the data rate and radio resources and the data rate requested by the mobile station, Node B performs scheduling for EUDCH packet data. The Node B 100 informs whether EUDCH data transmission is possible for each mobile terminal by using request data rate or channel state information of mobile stations using EUDCH or performs a scheduling operation of adjusting the EUDCH data rate. The Node B scheduling allocates a low data rate to a mobile station that is far away and a high data rate to a nearby mobile station while keeping the measured noise rise value not exceeding a target noise increase value to improve the performance of the entire system. This can be done by assigning.

In FIG. 1, the mobile terminals 101, 102, 103, and 104 are different from each other in the Node B 100. That is, the Node B 100 has the closest distance to the mobile terminal 101 and the closest distance to the mobile terminal 104. In this case, in FIG. 1, the transmission power used by each of the mobile terminals 101, 102, 103, and 104 has different values corresponding to the distance from the Node B 100. Expressed as thickness. The transmission power of the EUDCH from the mobile terminal 101 closest to the Node B 100 is smallest, as can be seen from the thickness of arrow 111, and the transmission of the EUDCH from the mobile terminal 104 farthest from the Node B 100 is farthest. The power is greatest, as can be seen from the thickness of arrow 104. Therefore, in order to maintain the same noise increase value in the Node B 110 and reduce inter-cell interference with other cells and to obtain the highest performance, scheduling may be performed in inverse proportion to the transmission power strength and the data rate. That is, the mobile station 104 with the smallest reverse transmission power is allocated closest to the distance to the Node B 100 and the largest data transmission rate is assigned to the mobile terminal 101 with the largest backward transmission power due to the longest distance from the Node B 100. Scheduling is performed so that the smallest data rate is allocated.

FIG. 2 is a diagram illustrating a signaling procedure between a base station and a mobile terminal for enhanced reverse dedicated transport channel service in an asynchronous code division multiple access mobile communication system. The signaling in FIG. 2 assumes signaling between the mobile station 102 and the Node B 100 in FIG.

Referring to FIG. 2, in step 203, a procedure for configuring an EUDCH for EUDCH service is performed between the Node B 100 and the mobile terminal 102. The configuration procedure of the EUDCH includes a process of transmitting and receiving messages through a dedicated transport channel. When the EUDCH configuration procedure is completed, in step 204, the mobile station 102 transmits information about a data rate required for scheduling and information necessary for estimating a reverse channel condition to the Node B 100. Information necessary for estimating the reverse channel state includes transmit power and transmit power margin of the reverse channel. In operation 211, the Node B 100 receiving the transmission power of the reverse channel may estimate the reverse channel situation by comparing the transmission power of the reverse channel with the reception power. That is, when the difference between the transmission power and the reception power is small, it is estimated that the channel condition is good. If the difference between the transmission power and the reception power is large, the channel condition may be estimated to be bad. When transmitting a transmission power margin as information for identifying the reverse channel situation, the Node B 100 estimates the transmission power of the reverse channel by subtracting the transmission power margin from the maximum possible transmission power of the MS 102 known in advance. Can be. The Node B 100 determines the maximum data rate that can be supported through the EUDCH using the estimated channel condition and information on the data rate required by the mobile station 102. The Node B 100 provides the determined maximum data rate to the mobile station 102 in step 205. That is, in step 211, the Node B 100 transmits the mobile station capable of EUDCH service, the maximum data rate of the mobile station 102 capable of transmitting actual packet data within the next TTI-Transmission time interval, and the transmission of the data. Determine the modulation scheme to be used and the number of codes to be allocated. In step 205, the Node B 100 allocates the determined maximum data rate, the modulation scheme to be used for data transmission, and the number of codes to be allocated to the mobile station 102. In this case, the scheduling method of the Node B 100 may vary according to Node B. In step 212, the mobile station 102 selects a data rate of packet data to be substantially transmitted according to the maximum data rate transmitted from the Node B 100. In addition, the mobile terminal 102 selects a transport format and resource related information (TFRI) of packet data to be transmitted through the EUDCH in step 212. This is referred to as Node B 100. In this case, the mobile terminal 102 transmits control information including the selected TFRI information and data rate request information to the Node B 100 in step 206. The TFRI information may include OVSF code information, modulation scheme, data size, and HARQ information, etc. In step 207, the mobile station 102 transmits the control information and the packet data to be transmitted to the Node B 100 through EUDCH. In step 213, the Node B 100 checks whether the packet data received from the mobile station 102 is in error or acknowledges. dgement (ACK) or Negative Acknowledgment (NACK), etc. In step 208, the Node B 100 transmits the selected ACK / NACK to the mobile station 102.

As described above, the method for providing the enhanced reverse dedicated transport channel service can be of the following two methods.

The first is to look at the queue size of the packet data stored in the temporary memory of each mobile station, and sends a rate request (hereinafter referred to as 'RR') signal according to the data transmission. Accordingly, the Node B 100 combines the transmission rate requests transmitted from each terminal, determines the overall rate, and then increases the data transmission rate of the corresponding mobile terminal as a rate grant signal, RG, to each mobile terminal. Allow. In this case, the RR signal and the RG signal each use 1 bit, and are also used for discontinuous transmission to indicate the increase, decrease, or maintenance of the data rate. The RR signal and the RG signal are frequently transmitted within a short transmission period (TTI), thereby increasing the efficiency of data transmission. However, as the RR signal and the RG signal are frequently transmitted within a short transmission period (TTI), there is a problem in that a signaling overhead occurs due to signaling. In addition, there is a problem in that the RR signal and the RG signal must be repeatedly performed as the data rate increases rapidly. Therefore, there is a problem that the scheduling time of the Node B 100 is long.                         

Second, as shown in step 204, each mobile station is a radio resource for transmitting information about a required data rate such as the RR information according to the scheduling implementation of Node B 100 and information for identifying a reverse channel situation. OVSF code is required. In addition, as in step 206, an OVSF code is required, which is another radio resource for transmitting control information necessary for receiving packet data to be transmitted according to the scheduling of the Node B 100. That is, by separating the control channel related to the scheduling and the TFRI channel including the data rate related to the packet data to be transmitted substantially, the Node B 100 may have an advantage that the scheduling may be more effectively and precisely performed. . However, in view of the characteristics of packet data generation, although scheduling information may be generated intermittently, a problem of shortage of resources of a predetermined OVSF code occurs as channel encoding is independently performed.

Accordingly, an object of the present invention for solving the above problems is to provide an apparatus and method for a mobile station to transmit control information to a base station through subframes on an uplink control channel.

In a first aspect for achieving the above object, the present invention provides a code division multiple access mobile having a mobile station and a base station for providing a packet data service through an enhanced reverse dedicated transport channel for the mobile terminals. In the communication system, the mobile terminal time-divisionally divides the control information for the packet data service and transmits it to the base station through subframes on a control channel. Generating a subframe to include a data rate, including channel status information according to a predetermined period, and including transmission format identification information, and transmitting the generated subframe to the base station. It is characterized by.

In a second aspect for achieving the above object, in a code division multiple access mobile communication system having a mobile station and a base station for providing a packet data service through an enhanced reverse dedicated transport channel for the mobile terminals; An apparatus for time division of control information for the packet data service by the mobile terminal and transmitting the data to the base station through subframes on a control channel, when transmission of packet data through the enhanced reverse dedicated transmission channel is required. The subframe is generated and transmitted to the base station, including the transmission rate, the channel status information according to a predetermined period, and the transmission format identification information.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, only representative embodiments of the present invention will be presented in order to accomplish the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

The present invention assumes a situation in which an enhanced reverse dedicated channel, that is, an EUDCH, used for improving reverse packet transmission efficiency in a communication system is used, which is called asynchronous wideband code division multiple access (WCDMA). The EUDCH is a channel proposed to improve the performance of packet transmission by introducing a new technology in reverse communication in an asynchronous code division multiple access communication system. Adaptive Modulation and Coding (hereinafter referred to as "AMC") used in High Speed Downlink Packet Access (hereinafter referred to as "HSDPA"), and Hybrid Automatic Retransmission. Request: hereinafter referred to as "HARQ") and short transmission time interval (hereinafter referred to as "TTI") The TTI may be defined as a unit in which one data block is transmitted in a physical channel, and the scheduling of the forward channel in HSDPA is not a radio network controller (hereinafter, referred to as “RNC”). As in Node B, reverse channel scheduling is also performed in Node B. In addition, for efficient scheduling of EUDCH of a plurality of mobile terminals, it is necessary to transmit information in uplink so that Node B can know information such as data rate and transmission power and transmission format required from each mobile terminal in advance. There is.

Therefore, the present invention is to propose a method for efficiently transmitting the uplink control information for the EUDCH mentioned above, and to reduce the interference of the uplink between mobile terminals.

First, the EUDCH for applying the embodiments of the present invention is a channel for enhanced reverse data packet service (hereinafter, referred to as "EUDCH service") and is referred to as an enhanced uplink dedicated physical control channel (hereinafter referred to as "EU-DPCCH"). ) And an enhanced uplink dedicated physical data channel (hereinafter referred to as "EU-DPDCH"). The EU-DPCCH is a control channel for transmitting control information required for EUDCH service, and the EU-DPDCH is a data channel for transmitting packet data according to the EUDCH service.

Through the EU-DPCCH, information necessary for estimating a data rate and a reverse channel state (for example, reverse transmit power or reverse transmit power margin) is transmitted as scheduling information. In addition, TFRI information corresponding to packet data transmitted to the EU-DPDCH is also transmitted through the EU-DPCCH. On the EU-DPDCH, packet data is transmitted at a data rate determined according to a scheduling command from Node B.

3 is a diagram illustrating the structure of the EU-DPCCH.

Referring to FIG. 3, one radio frame used for the EU-DPCCH has a length of 10ms and consists of five subframes. The radio frame is the most basic physical transmission unit in 3GPP, which is a standard for asynchronous mobile communication radio. Each subframe has a length of 2ms and becomes a basic unit for transmitting control information for EUDCH service. The control information transmitted through the subframe includes data rate request information (hereinafter, referred to as 'DRR information'), reverse channel state information (hereinafter referred to as 'CSI information'), and TFRI information. do. The DDR information and the CSI information are control information required for performing scheduling by Node B, and the TFRI information is required for the Node B to receive packet data transmitted through the EU-DPDCH from the mobile terminal. Control information.

In other words, the DRR information may indicate a value of one specific data rate in a set of data rates of transmittable packet data, or index all combinations of data rates in a table form and indicate one mapped index value. It may be. The CSI information is a value representing a channel state for transmitting packet data. As the CSI information, a transmission power of a mobile terminal, a transmission power margin of a reverse channel, a maximum allowable power of the mobile terminal, and the like can be used. Therefore, the Node B estimates the reverse channel situation using the CSI information. The TFRI information is transmitted to the Node B by the mobile terminal after scheduling based on the DRR information and the CSI information is completed. The TFRI information is control information indicating a format of actual packet data transmitted through EU-DPDCH, and the Node b receives the packet data by the TFRI information.

In FIG. 3, a subframe having a length of 2ms is assumed as the TTI of the EU-DPCCH, but a TTI such as 3.33ms may be used, which is a short TTI compared to a TTI of at least 10ms used in the conventional reverse channel. I use it. As described above, shortening the TTI means that the data block to be transmitted, that is, the transmission data unit, is shortened. Thus, Node B provides fast scheduling for the mobile terminal. In other words, to reduce the transmission power, each independent control information may be repeatedly transmitted during the short TTI. That is, the maximum flexibility to increase the transmission efficiency of the control information is guaranteed. For example, in a soft handover situation, instead of performing scheduling in a TTI having a length of 10 ms, the TFRI may be repeatedly transmitted five times in a period of the TTI having a length of 2 ms. Therefore, the transmission power of the mobile terminal can be reduced to 1/5 and the uplink interference between the mobile terminals can be reduced.

 4 is a diagram illustrating examples in which control information is time-divided and transmitted through EU-DPCCH in a predetermined transmission time interval.

Referring to FIG. 4, the DRR information, the CSI information, and the TFRI information can be transmitted in a TTI having a length of 2 ms. That is, the 2ms subframe can be transmitted including all of the DRR information, CSI information, and TFRI information. In addition, the subframe may be transmitted including only the TFRI information. In addition, the subframe may be transmitted including only CSI information and TFRI information. Alternatively, the subframe may be transmitted including only the DRR information and TFRI information. That is, the transmission of each of the control information, the DRR information, the CSI information, and the TFRI information may be independent of each other or discontinuous transmission. As described above, the EU-DPCCH performs time division multiplexing on the DRR information, the CSI information, and the TFRI information.                     

In other words, the DRR information is generated when there is packet data to be transmitted, when a request for increasing the data rate occurs, or when the data rate is to be changed. The CSI information is for estimating a current reverse channel situation. In a situation where reverse power control is currently performed, a downlink transmit power control command for controlling initial transmission power and subsequent transmission power of a mobile terminal is provided. Estimation is possible even with the change of "TPC". That is, the transmission period of the DRR information and the CSI information can be variablely transmitted. Thus, it provides the efficiency of transmitting packet data.

As described above, the mobile station can variably transmit and efficiently transmit the control information to the Node B through EUDCH to optimize scheduling performance for the Node B's mobile terminals, while simultaneously using the OVSF code resources. Minimize.

First embodiment

In the first embodiment, it will be described to transmit control information according to a transmission period of a subframe or to transmit the control information according to a transmission period of a radio frame composed of a plurality of subframes.

FIG. 5 is a diagram illustrating a first embodiment of a reverse control information channel transmitted through an uplink by a mobile terminal supporting an enhanced uplink dedicated transport channel according to the present invention.

Referring to FIG. 5, each mobile station monitors a buffer or a temporary storage unit in connection with packet data transmission. At this time, if a request for packet transmission is detected in the buffer or temporary storage, the amount of data to be transmitted and the reverse channel state information are transmitted. On the other hand, TFRI information is continuously transmitted in a 2ms TTI unit while packet data is transmitted. In this case, the CSI, which is the reverse channel state information, may be transmitted power information of the mobile station, and may be represented by other information including the channel state information. The CSI information is periodically transmitted until a predetermined period or a time point at which packet data transmission ends. The predetermined constant period is called a period N and can be changed to the period N = 2, 10, 20, 40 ms. That is, the period N may vary according to the change in the scheduling period of the Node B and the channel condition.

When a) packet data transmission of FIG. 5 is performed, control information is transmitted according to the transmission period of the 2 ms subframe until the end time of the packet data. In addition, b) indicates that when the packet data is transmitted, the control information is transmitted according to a transmission period of one radio frame composed of five subframes of 10 ms for the CSI until an end time of the packet data. In this case, the DRR information, CSI information, TFRI information can be transmitted independently of each other, and can be transmitted continuously as necessary.

FIG. 6 is a diagram schematically illustrating an internal configuration of a mobile terminal according to the control information channel shown in FIG.

Referring to FIG. 6, the detector 601 detects whether a packet is to be transmitted by monitoring a buffer and a temporary storage unit for transmitting packet data in a mobile station. At this time, the detector 601 checks the amount of packet data to be transmitted to the buffer and the temporary storage unit. The information field generator 602 generates a field for transmitting DRR information, which is information necessary for Node B scheduling, by referring to the amount of packet data. In addition, the information field generator 602 generates a field for transmitting CSI information for transmitting the packet data and TFRI information of the actual packet data. In this case, the information field generator 602 generates fields for transmitting the control information in a discontinuously or constant period field by a control signal applied from the controller 603. The controller 603 controls the information field generator 602 to be able to transmit each control field with a predetermined period or discontinuously according to the information received from the Node B. In addition, the controller 603 encodes the control information output through the information field generator 602 and then controls the switch unit 607 to transmit the control information discontinuously or with a certain period. That is, in the case of a), the CSI information is controlled to be transmitted according to the transmission period of the 2ms subframe until the end time of the packet data. In addition, in case of b), the CSI information is controlled to be transmitted according to a transmission period of one 10ms radio frame composed of five subframes until the end time of the packet data. In this case, the DRR information is an information field of high importance in performing the EUDCH service. The first channel encoder 604 performs channel encoding by including a CRC operation on each of the mobile terminals for the DRR output through the information field generator 602. The second channel encoder 605 performs channel encoding including a CRC operation for each mobile terminal for the CSI output through the information field generator 602. The third channel encoder 606 performs channel encoding, including a CRC operation for each mobile terminal for the TFRI output through the information field generator 602. In this case, in order to allow independent discontinuous transmission of each control information, different channel coding schemes should be used. In addition, the plurality of channel encoders 604 605 and 606 may repeatedly transmit each information field as necessary. Therefore, the data encoded through the channel encoders 604, 605, and 606 are output to one channel through the switch unit 607 under the control of the controller 603. Alternatively, each control field generated by the information field generator 602 may be encoded by one serially coded encoder, and may also be output through one channel through the switch unit 607. That is, the encoded control information is time-division multiplexed with each other and transmitted to Node B through one EUDCH.

FIG. 7 is a diagram illustrating a control flow according to the operation of FIG. 6 when a mobile terminal supporting an enhanced uplink dedicated transport channel according to a first embodiment of the present invention.

Referring to FIG. 7, in step 1002, the detector 601 monitors a buffer and a temporary storage unit for transmitting packet data inside a mobile station to determine whether a packet should be transmitted. In this case, if there is packet data to be transmitted through the detector 601, the process proceeds to step 1003. In step 1003, the mobile station determines the transmission method and formats of TFRI, which informs the DRR information, the CSI information, and the information on the transmission format of the actual packet data, which are necessary for Node B scheduling, through the information field generator 602 to control the control. Create each control field corresponding to the information. In step 1004, the mobile station determines whether the DRR information is continuously transmitted. In this case, if the value of the DRR is continuously transmitted, the process proceeds to step 1007 and includes a channel coded output including the CRC operation of the mobile stations for the DRR. In step 1005, the mobile station determines whether the CSI information is continuously transmitted. In this case, if the value of the DRR is continuously transmitted, the process proceeds to step 1008 and outputs the channel encoding including the CRC operation of the mobile terminals for the CSI. In step 1006, the mobile station checks whether the TFRI is continuously transmitted. In this case, if the TFRI value is continuously transmitted, the process proceeds to step 1009 and outputs the channel code including the CRC operation of the mobile terminals for the TFRI. In step 1010, the encoded and output control information is time-division multiplexed and transmitted to the Node B through one EUDCH channel.

Second embodiment

In the second embodiment, it will be described to transmit control information including channel status information in the first subframe among the three subframes. That is, the channel status information is transmitted at a predetermined period regardless of the data rate.

8 is a diagram illustrating a second embodiment of a reverse control information channel transmitted by a mobile station supporting an enhanced reverse dedicated transport channel through uplink according to the present invention.

Referring to FIG. 8, it is shown that CSI information is transmitted at a predetermined position according to a predetermined period regardless of the presence or absence of packet data to transmit the control channel of FIG. 8. That is, regardless of the DRR information, the Node B periodically transmits transmission power information of the mobile station so as to know the state of the reverse channel.

The DRR information is periodically transmitted with a 10 ms period, and the CSI information is periodically transmitted with a period of 6 ms regardless of the DRR information. That is, the CSI information is transmitted through the first subframe of the three subframes. In this case, the TFRI information indicates that the TFRI information is periodically transmitted with a transmission period of 2 ms regardless of the DRR of the packet data. That is, each control information can be transmitted as needed independently of each other. At this time, the internal configuration of the mobile terminal according to the second embodiment is characterized in that not shown similar to the first embodiment.

FIG. 9 is a diagram illustrating a control flow according to the operation of FIG. 8 when a mobile terminal supporting an enhanced uplink dedicated transport channel according to a second embodiment of the present invention.

In step 1102, the detector 601 monitors a buffer and a temporary storage unit for transmitting packet data in the mobile station and checks whether there is a packet to be transmitted. In this case, if there is packet data to be transmitted through the detector 601, the flow proceeds to step 1103. In step 1103, the mobile station determines the transmission method and formats of TFRI, which informs DRR information, CSI information, and information on a transmission format of actual packet data, which are necessary for Node B scheduling, through the information field generator 602, and controls the control. Produce each control field corresponding to the information and proceed to the next step. In this case, in step 1106, the CSI information is transmitted with a 6ms period through the controller 602. In step 1109, the channel encoder 606 encodes and outputs periodically generated CSI information. On the other hand, in step 1104, the DRR information is continuously transmitted under the control of the controller 603, or an information field is generated to have an arbitrary period to output the DRR information. In step 1107, the DRR information is encoded and output through the channel encoder 604. In addition, in step 1105, the TFRI information is continuously generated under the control of the controller 603 or is controlled and generated to have an arbitrary period. In step 1108, the TFRI information is encoded and output through the channel encoder 605. The control information encoded and output in step 1110 is time division multiplexed and transmitted to the Node B through one EUDCH channel.

Third embodiment

In the third embodiment, it will be described that channel information having the same transmission period as that of the data rate information is transmitted. In this case, the data rate information is control information generated when packet data transmission is required or when the data rate is to be changed. Therefore, the channel status information is transmitted at the same period as the data rate information is generated.

FIG. 10 is a diagram illustrating a structure of control information transmitted by a mobile terminal supporting an enhanced uplink dedicated transport channel according to a third embodiment of the present invention.

Referring to FIG. 10, when the mobile station transmits DRR information about packet data, it indicates that the mobile station simultaneously transmits CSI information about channel conditions for transmitting the packet data. Therefore, when there is packet data to be transmitted, the CSI information is transmitted together only during initial transmission where DRR information is generated. This method is characterized in that the CSI information is transmitted only once during the initial transmission, and after that, the channel condition is estimated by using TPC information, which is a downlink transmission power control command, during the transmission of the packet. Therefore, the transmission of CSI information for channel estimation is minimized to minimize uplink interference. At this time, the DRR information is generated once for every TTI of 10ms in length, and therefore, the CSI information is also transmitted in a TTI of 10ms in length.

FIG. 11 is a diagram schematically illustrating an internal block configuration of a mobile terminal according to the transmission method illustrated in FIG. 10.

Referring to FIG. 11, the detector 901 monitors a buffer and a temporary storage unit for transmitting packet data in a mobile station and detects whether a packet should be transmitted. At this time, the detector 901 checks the amount of packet data to be transmitted to the buffer and the temporary storage unit. The information field generator 902 generates a field for transmitting DRR information, which is information necessary for Node B scheduling, CSI information indicating a channel state for transmitting the packet data, and TFRI information of the actual packet data with reference to the packet data amount. do. In this case, the information field generator 902 may generate fields for transmitting the control information discontinuously or as a field having a predetermined period by a control signal applied from the controller 903. The controller 903 controls the information field generator 902 so as to enable transmission of each control field with a predetermined period or discontinuously according to the information received from the Node B, and controls the switch unit 906. That is, the controller 903 controls to transmit the DDR information in a 10 ms TTI. Therefore, the CSI information is also controlled to be transmitted in a 10 ms TTI. In other words, the DDR information is controlled to be transmitted according to the transmission period of one radio frame of 10ms consisting of five subframes. The CSI information is also controlled to be transmitted according to the transmission period of one 10ms radio frame composed of five subframes. The multiplexing and first channel encoder 904 multiplexes the DRR information and the CSI information generated according to a transmission period of one 10 ms radio frame, and performs channel encoding including a CRC operation for each mobile station. The third channel encoder 905 performs channel encoding by including a CRC operation for each mobile terminal on the TFRI information output through the information field generator 602. At this time, in order to allow independent discontinuous transmission of each control information field, a different channel coding method should be used. The multiplexing and first channel encoder 904 and the third channel encoder 905 can also be repeatedly transmitted to each information field as necessary. Accordingly, the control information encoded through the channel encoders 904 and 905 is output through one switch through the switch unit 607 under the control of the controller 903. Alternatively, each control field generated by the information field generator 602 may be encoded through one serially coded encoder and may be output as one channel through the switch unit 607. That is, the encoded control information is time-division multiplexed with each other and transmitted to Node B through one EUDCH.

FIG. 12 is a diagram illustrating a control flow according to the operation of FIG. 11 when a mobile terminal supporting an enhanced uplink dedicated transport channel according to a third embodiment of the present invention.

Referring to FIG. 12, in step 1202, the detector 901 provided in the mobile terminal monitors a buffer and a temporary storage unit for transmitting packet data in the mobile terminal and checks whether there is a packet to be transmitted. In this case, if there is packet data to be transmitted through the detector 901, the process proceeds to step 1203. In step 1203, the mobile station generates respective control fields for transmitting the DRR information and the CSI information, which are information required for Node B scheduling, through the information field generator 902 and proceeds to the next step. In step 1204, the DRR information and the CSI information are multiplexed through the multiplexing and channel encoder 904. In step 1205, the multiplexed DRR information and the CSI information are discontinuously transmitted by a signal applied from the controller 903. It is controlled to transmit with a certain period. In step 1206, the DRR information and the CSI information are mixed-coded and output under the control of the controller 903. In contrast, in step 1203, the information field generator 902 generates a TFRI field for TFRI information, which is information on a transmission format of packet data to be transmitted, having a 2 ms TTI length, regardless of the DRR information. In step 1207, the generated TFRI field is controlled to be transmitted discontinuously by a signal applied from the controller 903 or to have a predetermined period. In step 1208, the TFRI is channel coded and output according to the control of the controller 903. In step 1209, the encoded and output control information is time-division multiplexed and transmitted to the Node B through one EUDCH channel.

As described above, the present invention has an effect of minimizing power consumption of the mobile station by time division and transmission of control information necessary for scheduling from the base station to the mobile station using the enhanced reverse dedicated transport channel service. It also has the effect of minimizing the use of code resources. Therefore, the interference of the uplink control channel between the mobile stations providing the reverse dedicated transport channel service is minimized, thereby improving the data reception performance.

Claims (18)

In a code division multiple access mobile communication system having mobile terminals and a base station for providing a packet data service through an enhanced reverse dedicated transport channel for the mobile terminals, the mobile terminal time-divisions control information for the packet data service. A method for transmitting to the base station through subframes on a control channel, When the transmission of packet data through the enhanced reverse dedicated transport channel is required, the subframe is generated to include a data rate as the control information, include channel status information according to a predetermined period, and include transmission format identification information. Process, And transmitting the generated subframe to the base station. The method of claim 1, wherein the period in which the subframe includes the channel status information is a transmission period of the subframe. The method of claim 1, wherein the period in which the subframe includes the channel status information is a transmission period of a radio frame including a plurality of subframes. 4. The method of claim 3, wherein the radio frame consists of five subframes. The method of claim 1, wherein the channel status information is included in the first subframe among three subframes and transmitted. The method of claim 1, wherein the channel status information is the same as the transmission period of the data rate. The uplink as claimed in claim 1, wherein when the subframe does not include the data rate and the channel state information, a discontinuous transmission process is performed on an area including the data rate and the channel state information in the subframe. Method of transmitting link control channel. The method of claim 1, wherein the period in which the subframe includes the transmission format identification information is a transmission period of the subframe. In a code division multiple access mobile communication system having a mobile station and a base station providing a packet data service through an enhanced reverse dedicated transport channel for the mobile stations, the mobile station time-divisionally divides control information for the packet data service. In the apparatus for transmitting to the base station through the sub-frames on the control channel, When the transmission of the packet data through the enhanced reverse dedicated transmission channel is required, the subframe is generated to include the data rate, the channel status information according to a predetermined period, and the transmission format identification information to the base station. Device for transmitting the uplink control channel, characterized in that for transmitting. 10. The apparatus of claim 9, wherein the period in which the subframe includes the channel status information is a transmission period of the subframe. 10. The apparatus of claim 9, wherein the period in which the subframe includes the channel status information is a transmission period of a radio frame composed of a plurality of subframes. 12. The apparatus of claim 11, wherein the radio frame consists of five subframes. 10. The apparatus of claim 9, wherein the channel status information is included in the first subframe among three subframes and transmitted. 10. The apparatus of claim 9, wherein the channel status information is the same as the transmission period of the data rate. 10. The method of claim 9, wherein when the subframe does not include the data rate and the channel state information, an area in the subframe that includes the data rate and the channel state information is discontinuously transmitted. Device for transmitting a link control channel. The apparatus of claim 9, wherein the period in which the subframe includes the transmission format identification information is a transmission period of the subframe. The method of claim 1, wherein the generating of the subframe comprises: Generating the data rate, the channel status information, and the transmission format identification information when transmission of packet data through the enhanced reverse dedicated transport channel is required; And channel coding and multiplexing the data rate, the channel status information, and the transmission format identification information independently, The transmitting may include time-division multiplexing the encoded control information and transmitting the uplink control channel to the base station in a subframe. 10. The apparatus of claim 9, further comprising: an information field generator for generating the data rate, channel status information, and transmission format identification information according to a control signal applied from a controller when transmission of packet data through the enhanced reverse dedicated transport channel is required; A plurality of channel encoders for channel coding and multiplexing the data rate, the channel condition information, and the transmission format identification information independently; And a controller for applying a control signal to a switch to generate a subframe by time division multiplexing the encoded control information.

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