KR20060022580A - Apparatus and method for signaling absolute scheduling information in enhanced uplink system - Google Patents

Abstract

The present invention provides an Enhanced Uplink Dedicated Channel (Ehanced-Shared Control Channel) for transmitting control information for transmitting an E-DCH in an E-DCH-enabled system. , Which is referred to as an E-SCCH), wherein a transmission time interval (TTI) of the reverse data is set to 10 ms and a transmission time interval (TTI) of control information required for the reverse data transmission is 2 ms. The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by a plurality of terminals, and the base station is configured to schedule a terminal to transmit data through K-th TTI. A predetermined number of subframes of the common control channel are set as valid periods from a time before a processing period of data to be transmitted in a K-th TTI. By, and an apparatus and method for transmitting scheduling information for the terminal to transfer data to the K-th TTI for the useful portion.

WCDMA, E-DCH, uplink packet transmission, Node-B scheduling, scheduling information, E-SCCH,

Description

Apparatus and Method for signaling absolute scheduling information in Enhanced uplink system}             

1 is a diagram illustrating a basic concept according to an enhanced reverse dedicated channel service in a mobile communication system.

2 is a diagram illustrating a signaling procedure between a base station and a mobile station for enhanced uplink dedicated channel service in a mobile communication system.

3 is a time structure diagram illustrating a transmission / reception time with a control channel when the mobile communication system supports a hybrid retransmission technique (HARQ).

4 is a structural diagram showing a time relationship when the transmission period of the E-SCCH and the transmission period of the E-DCH are different.

5 is a diagram illustrating an example of base station scheduling to which the present invention is applied.

6 is a diagram illustrating an E-DCH transmission method to which an E-SCCH valid period is applied according to a valid period setting method according to the first embodiment of the present invention.

7 is a diagram illustrating a procedure of a base station for implementing the first embodiment of the present invention.                 

8 is a diagram illustrating a procedure of a terminal for implementing the first embodiment of the present invention.

9 illustrates a method of receiving an E-SCCH according to a second embodiment of the present invention.

10 is a diagram illustrating the operation of a terminal according to a second embodiment of the present invention;

11 is a view showing the configuration of a terminal according to the present invention.

The present invention relates to an asynchronous wideband code division multiple access (WCDMA) communication system. The present invention relates to a transmission of a channel for transmitting absolute scheduling information when a packet service is performed through a reverse transport channel. When the time interval has a short transmission time period compared to the uplink transmission channel of the terminal, the present invention provides an apparatus and method for setting the time and interval of receiving the scheduling information so that the base station can efficiently transmit the scheduling information.

That is, the present invention assumes a situation in which an enhanced uplink dedicated channel (E-DCH) is used in a WCDMA communication system. The E-DCH is a channel proposed to improve uplink packet transmission performance in an asynchronous code division multiple access communication system. The newly introduced technology for the E-DCH includes Adaptive Modulation and Coding (hereinafter referred to as "HSDPA"), which is used in the existing High Speed Downlink Packet Access (HSDPA). AMC ', a Hybrid Automatic Retransmission Request (hereinafter referred to as HARQ), and a Node-B based scheduling method are considered.

1 shows a basic conceptual diagram of a situation in which an E-DCH is used.

Referring to FIG. 1, Node B 110 is one of active NodeBs supporting data packet service through EUDCH, and terminals shown in 101, 102, 103, and 104 are terminals transmitting E-DCH.

The base station of 110 determines the channel status and buffer status of each terminal from each terminal using the E-DCH and performs scheduling appropriate for each terminal. The terminals 101 to 104 determine and transmit the maximum allowable data rate of the E-DCH data according to the scheduling. In uplink, synchronization is not maintained between uplink signals transmitted from different terminals.

Therefore, there is no orthogonality between the uplink signals, so that the uplink signals act as interference with each other. Therefore, as the uplink signal received by the base station increases, the amount of interference with respect to the uplink signal transmitted by a specific terminal also increases, thereby reducing reception performance.

In order to overcome this, each terminal can increase its uplink transmission power, but this acts as a greater interference to other uplink signals, thereby degrading the reception performance of uplink signals transmitted from other terminals. Cause. This phenomenon limits the amount of uplink signals that the base station can receive while guaranteeing reception performance. This can be explained using Rise Over Thermal (ROT) defined as in Equation 1.

ROT = I _O / N _O

I _o denotes the total amount of uplink signals received by the base station as the total received wideband power spectral density of the base station. N _o is the thermal noise power spectral density of the base station. Therefore, the maximum allowable ROT may be referred to as a radio resource that the base station can use in the uplink.

2 is a diagram illustrating a signaling procedure between a base station and a mobile station for enhanced reverse dedicated transport channel service in an asynchronous code division multiple access mobile communication system. That is, the basic procedure of transmitting and receiving an E-DCH may be described as in the process of FIG. 2.

Referring to FIG. 2, the terminal 202 transmits an E-DCH, and the base station 201 becomes a base station that performs base station scheduling for the terminal 202. The base station 201 and the terminal 202 perform transmission and reception setting of the E-DCH in step 203. The configuration process includes the delivery of messages over a dedicated transport channel. In the situation where the E-DCH configuration is performed in step 203, the terminal 202 informs the base station 201 of the scheduling information as shown in 204.                         

Scheduling information that may be included in the 204 may be a terminal transmission power information that can know the reverse channel information, the extra power information that can be transmitted by the terminal, or the amount of data to be transmitted in the buffer of the terminal have. The base station 201 receiving the information from the various terminals schedules the respective terminals while monitoring scheduling information of the various terminals in step 211. If the base station 201 determines to schedule the reverse packet transmission to the terminal 202 according to the process of step 211, the base station 201 transmits the scheduling allocation information of 205 to the terminal 202. The scheduling allocation information of 205 may include an allowed data rate and an allowable timing, or increase / maintenance / decrement information about a previous data rate.

The terminal 202 determines the transmission format (TF) of the E-DCH to be transmitted in the reverse direction as shown in step 212 by using the information of the 205, and the TF information with the E-DCH of 207 as in step 206. Together with the base station 201. The base station 201 receiving the information of steps 206 and 207 determines whether there is an error in the TF information of 206 and the E-DCH of 207 as shown in step 213, and if there is any error, NACK information is received. In case there are no errors, the ACK information is transmitted to the terminal 202 through the ACK / NACK channel of 208. When ACK information is transmitted in step 208, transmission of the E-DCH information in step 207 is terminated, so that new information can be sent by E-DCH. In contrast, when NACK information is transmitted in step 208, E -DCH retransmits the information transmitted through the E-DCH at the previous time through the E-DCH at the current time.

Next, a channel for transmitting scheduling information in the procedure described with reference to FIG. 2 will be described in detail. Methods of delivering scheduling information may be divided into a method of delivering relative scheduling information and a method of delivering absolute scheduling information.

The method of transmitting the relative scheduling information is a method of signaling limited information such as + 1/0 / -1, and the terminal receives this to increase / maintain / decrease the maximum allowable transmission rate currently set. The method of transmitting scheduling information by using this method has the advantage of reducing the signaling overhead of the downlink due to the small amount of information required for transmission of scheduling information. However, there is a disadvantage in that it cannot react immediately in the case of rapidly increasing the transmission rate. do. Since the relative scheduling information requires about 1 bit, a code division multiplexing method using a time multiplexing method in which one common channel is divided into signaling points for each terminal or signaling by assigning a unique orthogonal code for each terminal Can be used.

On the other hand, the method of transmitting absolute scheduling information transmits the scheduled absolute maximum rate to the terminal to be scheduled. When the terminal receives this, the maximum allowable transmission rate is set as the information. Since there is a large amount of information required to inform the absolute value as described above, when a dedicated channel is used for each terminal, downlink transmission power is used a lot.

Therefore, the HSDPA uses a common channel like the HS-SCCH, but may transmit the terminal using a unique identifier to recognize the scheduling information of each terminal. As described above, it may be referred to as a reverse common control channel (called an E-SCCH) of a channel for transmitting absolute rate information.

Next, the transmission / reception time relationship between channels for the E-DCH service will be described in detail.

3 is a diagram illustrating HARQ operation to be applied in an E-DCH. In FIG. 3, it is assumed that the number of HARQ processes is 4, and thus 4 independent HARQ processes can be performed. First, the terminal transmits packet data in a frame of a transmission time interval (hereinafter, referred to as 'TTI'). When the terminal transmits a packet through the # 1 HARQ channel corresponding to 301, the base station receives the packet transmitted through the # 1 HARQ channel after a predetermined propagation time T_prop 302. The base station demodulates the data after receiving the data as much as the TTI 303. If there is no error as a result of demodulation, an ACK is transmitted as shown at 304 and an NACK is transmitted when an error occurs.

In this case, the T_nbp 305 is a time required for the base station to process a packet by receiving a packet transmitted through a # 1 HARQ channel at time 311. This time depends on the size of the data and the characteristics of the receiver. The ACK / NACK transmitted by the base station is received at the terminal after the predetermined propagation time T_prop 302 and the ACK / NACK reception time T_acknak 306 again. The terminal may calculate in which frame an ACK / NACK response of a corresponding channel arrives in consideration of the above time. When the ACK / NACK response is received in the calculated frame, the terminal performs initial transmission on the next packet data in case of ACK and retransmission on previous packet data in case of NACK. At this time, the time taken to receive the ACK / NACK response and perform retransmission or initial transmission is T_uep 308.                         

If synchronous HARQ is supported, the UE can perform proper combining only when the UE retransmits the packet data receiving the NACK response in the same HARQ chanel. In FIG. 3, ACK / NACK information must be received before time 313. In addition, unlike the HSDPA, the E-DCH receives scheduling information of the base station regarding the data rate in addition to the ACK / NACK information. This information becomes information necessary for determining the data rate to be used for transmitting data every TTI.

In this case, since the base station applies the scheduling information, that is, it does not separately inform the information on the scheduled TTI, the terminal should receive the terminal by setting a time relationship for the scheduling control information of the base station as well as the ACK / NACK information. In general, assuming that the base station scheduling information is transmitted every TTI, the base station scheduling information is preferably received before time 313 similarly to the ACK / NACK. In other words, when the ACK / NACK information of 304 is received for the kth TTI of 301 at 313 and applied to k + 4th TTI of 309, the maximum data rate of k + 4th TTI is the received E-SCCH at 311. It must be determined by the base station scheduling information transmitted through the scheduling processing time of the terminal can be considered while minimizing the scheduling delay time.

Next, the transmission time interval of the control channel will be described. In general, HSDPA determines TTIs of all control channels according to data TTIs. Because the terminal can transmit data every TTI, it is preferable to transmit the control channel in the TTI unit of the data channel to support this.

However, although E-DCH is currently decided to support 10ms TTI by default, it should be able to support 2ms TTI as well. In other words, since two TTIs are used, a terminal having a 2 ms TTI and a terminal using a 10 ms TTI may exist simultaneously in one cell.

In the case of the control channel transmitted through the dedicated channel in the above environment, the terminal may set the TTI of the control channel according to the TTI used for data transmission, but when the control channel is a shared channel, the terminal supports 2 ms TTI and 10 ms TTI. There is no way to do this. In this case, the common control channel may be an E-SCCH delivering an absolute transmission rate. In addition, the E-SCCH may transmit other base station scheduling information in addition to an absolute transmission rate.

Accordingly, an object of the present invention for solving the above-described problems of the prior art is to provide an enhanced uplink dedicated channel (ie, enhanced uplink dedicated channel), that is, an enhanced transmission of control information for transmitting an E-DCH in a system supporting an E-DCH. An apparatus and method for efficiently transmitting and receiving a common control channel (E-SCCH, hereinafter referred to as E-SCCH) are provided.

Another object of the present invention is to define the effective period of the E-SCCH so that the scheduling information is efficiently transmitted to the terminal using a 10ms TTI longer than the TTI of the E-SCCH in the system for transmitting the E-DCH, the terminal within the valid period An apparatus and method for receiving and applying scheduling information are provided.

It is still another object of the present invention to specify a method of transmitting scheduling information to a UE using only a specific subframe and a method of receiving an E-SCCH only during the specific subframe, thereby enabling signaling of scheduling information efficiently. It is to provide an apparatus and method for making it.

In a specific implementation method for achieving the object of the present invention, in the method for determining the transmission timing of the control information required for transmitting the reverse data in a system for transmitting reverse data, the transmission time interval (TTI) ) Is set to 10ms, the transmission time interval (TTI) of the control information required for the reverse data transmission is set to 2ms, and the channel for transmitting the control information necessary for the reverse data transmission is shared by several terminals. The common control channel, and the base station sets a predetermined number of subframes of the common control channel from a point in time before the processing interval of the data to be transmitted to the K-th TTI to schedule the UE to transmit the data to the K-th TTI. Is set as a valid interval, and is used as the K-th TTI during the valid interval. It characterized in that it comprises the step of transmitting the scheduling information for the terminal to transmit the emitter.

In another implementation method for achieving the object of the present invention, in the reverse data transmission method in a system for transmitting reverse data, the transmission time period (TTI) of the reverse data is set to 10ms, the reverse data transmission Set the transmission time interval (TTI) of the control information necessary for the 2ms, the channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, the terminal is K -th setting a predetermined number of subframes of the common control channel from the time point before the processing section of the data to be transmitted to the TTI as a valid period, receiving the common control channel during the valid period, and receiving the received common control Obtaining scheduling control information by decoding a subframe of a channel; According to the control information is characterized in that it comprises a process for generating and transmitting a data frame transmitted to the K-th TTI.

In another implementation method for achieving the object of the present invention, a method for determining the transmission timing of the control information required for transmitting the reverse data in a system for transmitting reverse data, the transmission time interval (TTI) ) Is set to 10ms, the transmission time interval (TTI) of the control information required for the reverse data transmission is set to 2ms, and the channel for transmitting the control information necessary for the reverse data transmission is shared by several terminals. Set to a common control channel, and the base station selects a specific subframe of the common control channel existing at a point in time before a processing interval of data to be transmitted to the K-th TTI to schedule a terminal to transmit the data to the K-th TTI. Setting a valid period for a terminal and using the subframe as the K-th TTI. It characterized in that it comprises the step of transmitting the scheduling information for the terminal to transmit the emitter.

In another implementation method for achieving the object of the present invention, in the reverse data transmission method in a system for transmitting reverse data, the transmission time interval (TTI) of the reverse data is set to 10ms, the reverse data The transmission time interval (TTI) of the control information necessary for the transmission is set to 2ms, the channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, and the terminal Receiving only a specific subframe of the common control channel existing before a processing interval of data to be transmitted to a K-th TTI, obtaining decoding control information by decoding the received subframe, and scheduling scheduling information And generating and transmitting a data frame to be transmitted to the K-th TTI according to the present invention. It is done.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

According to the present invention, a transmission time interval (hereinafter referred to as a TTI) of a reverse dedicated channel transmitted by a UE is 10 ms, and a TTI of a reverse control channel for transmitting scheduling information for the reverse dedicated channel sets a transmission / reception time point. It is about a method.

Specifically, the present invention provides an enhanced uplink dedicated channel transmitted by the UE, that is, a transmission time interval (hereinafter referred to as TTI) of the E-DCH is 10 ms, and scheduling information for the E-DCH is provided. The present invention relates to a method for setting an E-SCCH transmission / reception time point when a TTI of a reverse common control channel (referred to as E-SCCH) for transmitting 2 ms is 2 ms. For reference, in a specific embodiment of the present invention, it is assumed that the E-SCCH transmits an absolute scheduling assignment (SA). However, in the present invention, the E-SCCH does not exclude an environment in which transmission rate control information of increase / maintenance / downward and HARQ information such as ACK / NACK are transmitted.

In the present invention, when terminals using 2ms TTI and 10ms TTI exist simultaneously in a cell, E-SCCH having a TTI of 2ms and 10ms may be configured by assigning different channel codes for each TTI. However, when different channel codes are allocated for each TTI, the number of code channels to be used increases, which leads to a waste of code resources. Therefore, a terminal having a 2 ms TTI and a 10 ms TTI can be set to receive a common E-SCCH channel structure. It is appropriate to transmit scheduling information.

In other words, the channel code that should be used for the E-SCCH by setting the TTI of the E-SCCH according to the 2ms TTI so that not only the UE using the 2ms TTI but also the UE using the 10ms TTI receive the E-SCCH of the 2ms TTI. Can save. In this case, the channel structure will be described with reference to FIG. 4.

As in the prior art, a 2ms sub-frame of 401,402, which is control information transmitted from the E-SCCH before 411, which is the time when the T_uep 404 starts, is received and defined to be used for transmission of the k + 4th TTI 405. Can be. However, since it is possible to receive up to five control information through the E-SCCH subframe for a period of 403 until the maximum allowable transmission rate corresponding to the k + 4th TTI 405 is determined, the UE corresponds to the k + 4th TTI 405. There is a need to newly define the reception time of the E-SCCH necessary to determine the maximum allowable transmission rate of the E-DCH.

Therefore, the present invention proposes an efficient method for transmitting and receiving an E-DCH by using an E-SCCH set to a TTI shorter than the E-DCH TTI by the UE transmitting the E-DCH as described above.

The proposal of the present invention will be briefly described below. The present invention proposes a method for transmitting / receiving E-SCCH information in the interval by setting an effective sub-frame interval for receiving the E-SCCH by the UEs transmitting the E-DCH using a 10ms TTI to increase scheduling efficiency. .

The technical configuration of the present invention proposes a method of defining an effective sub-frame period in which a UE transmitting an E-DCH receives an E-SCCH using a 10ms TTI. In addition, the present invention is composed of the operation of the base station for transmitting the E-SCCH in the effective sub-frame, and the operation principle of the terminal for receiving the E-SCCH in the effective sub-frame.

The operating principle of the proposed base station and the terminal of the present invention is schematically as follows.

Base station operation: When the E-SCCH channel is insufficient compared to the terminal to transmit the scheduling information, the terminal that has a valid sub-frame is delayed without transmitting in the corresponding sub-frame and then tries to transmit again in the next valid sub-frame period. do.

UE operation: checks whether there is E-SCCH information allocated to itself by receiving an E-SCCH during a predefined effective sub-frame period, and updates the maximum allowable transmission rate of the corresponding TTI based on the received control information do.

The operation of the base station will be described in more detail as follows.

It is assumed that the E-SCCH TTI is 2ms, the E-DCH TTI of UE1 and UE2 is 10ms, and the E-DCH TTI of UE3 is 2ms, and is configured with a 10ms interval having five subframes of UE1, UE2 and UE3. It is assumed that the valid period of each UE that is matched also matches. At this time, when the base station wants to simultaneously transmit scheduling information to the E-DCH to each terminal at the same time, the base station may allocate a subframe within the valid period to each terminal according to the following principle.

First, the UE set to 10ms TTI can delay the transmission time of the scheduling information transmission to the next subframe within the validity interval since the same scheduling information needs to be transmitted only through one subframe among five subframes within the validity interval.

Second, among UEs set to the same TTI, scheduling transmission time of a terminal having a low priority service or data having low QoS according to QoS or service type of data to be transmitted by each terminal is transmitted to the next subframe within an effective period. Can be delayed.

Hereinafter, operations of the base station and the terminal will be described through separate embodiments.

5 shows an example of base station scheduling to which the present invention is applied. Hereinafter, the present invention will be described with reference to FIG. 5. 5 assumes an environment in which a UE having a 2ms TTI and a UE having a 10ms TTI exist simultaneously and one E-SCCH is configured for the two UEs.                     

Referring to FIG. 5, when data to be transmitted to the UE1 and the UE2 through the E-DCH occurs at 505 and 508, respectively, the scheduling time of the two UEs coincide with each other. Can transmit If the base station signals the scheduling information 511 at 521, since the E-SCCH channel is one, the scheduling information 511 will be allocated for UE1 or UE2, that is, for only one of the two terminals.

However, if the UE establishes a valid sub-frame interval and continuously receives the E-SCCH in its valid sub-frame to obtain scheduling information of k + 4th TTI as proposed by the present invention, another scheduling information (at 521) may be obtained. 512). That is, the scheduling information 511 for UE1 is transmitted at time 521, and the scheduling information 512 for UE2 is transmitted after a sub-frame, that is, at time 521, so that both UE1 and UE2 have an E- of k + 4th TTI. Scheduling information 511 and 512 for transmitting the DCH may be received. That is, the base station can schedule the E-DCH of as many terminals as possible with the minimum E-SCCH channel.

Through the following examples will be shown a preferred embodiment of the present invention.

<< Example 1 >>

The UE receives the E-SCCH for a predetermined period from the sub-frame just before the processing time required for transmitting the E-DCH and checks whether there is scheduling information transmitted to the UE. As described above, when the control information for the UE is repeatedly transmitted for a certain period through the E-SCCH, the UE may receive signaling for the corresponding TTI at various time points through one E-SCCH. Accordingly, the base station can flexibly operate the E-SCCH transmission. We propose a method in which a certain interval is set to the E-DCH TTI. In addition, when a section shorter than the E-DCH TTI is to be set, it may be designated through signaling in advance.

6 illustrates an E-DCH transmission method to which an E-SCCH valid period is applied according to the valid period setting method of the first embodiment. Hereinafter, Example 1 will be described in detail with reference to FIG. 6.

In FIG. 6, it is assumed that an E-DCH TTI is a 10ms TTI, and the UE may request a transmission rate through the E-REQCH 603 when the UE wants to obtain a high transmission rate. The ACKCH 602 is a channel that transmits ACK / NACK information, which is information for requesting the next initial transmission when the base station normally receives the E-DCH or retransmission when an error occurs, to the terminal. It is set in units. In addition, the E-SCCH 601 is a channel through which the base station transmits scheduling information so that the terminal can determine a transmission rate that can be transmitted in every TTI. The transmission period of the E-SCCH 601 is set to 2 ms TTI, unlike the transmission period of the E-DCH.

An interval 605 of FIG. 6 is an example of setting an effective interval for UE1. As described in the prior art, the timing of the ACKCH and the E-DCH is determined to receive the ACK / NACK information of the E-DCH data transmitted by the corresponding HARQ process and to initially transmit or retransmit the E-DCH at the HARQ process timing. In other words, in order to determine whether to transmit ACK / NACK and determine initial transmission or retransmission and transmit packet data at a corresponding time, the terminal must receive ACK / NCAK before T_uep, which is a processing time of the terminal.

For example, an ACK / NACK reception time that a UE should receive to determine transmission of k + 4th TTI becomes an ACK 607 that can be received before 621. In the case of the E-SCCH, all of the sub-frames received during the period set as the valid period from the point before the T_uep can be received will be the scheduling information applicable to the corresponding TTI.

In FIG. 6, since 10 ms is assumed to be an effective period, control information 608 to 612 that UE1 can receive before time 621 may be used as scheduling information for E-DCH transmission of k + 4th TTI. That is, all five sub-frames belonging to the section 605 become a section in which scheduling information of k + 4th TTI can be transmitted.

Next, a base station operation for a preferred implementation of Embodiment 1 will be described with reference to the flowchart of FIG. 7. At every scheduling point, the base station performs a scheduling procedure. First, as shown in 702, RoT is allocated to UEs based on RoT information of a base station for an E-DCH, a buffer state, and a power state of each UE.

In general, since all RoTs cannot be allocated to all terminals in the base station, E-SCCHs are allocated to Na terminals. Next, if the current number of E-SCCH channels is set to Nch, Na and Nch are compared. (703) If Na is smaller than Nch, scheduling information is transmitted to all scheduled terminals as shown in 705 through E-SCCH. If Na is larger than Nch, the base station delays the transmission of scheduling information of the 10ms terminal and transmits the scheduling information to the remaining terminals using the E-SCCH, if there is a 10ms terminal as shown in 704. The scheduling information of the delayed 10ms UE is transmitted through the remaining E-SCCH if the available E-SCCH remains as shown at 706 at the next scheduling time.

Next, the operation of the preferred terminal of the present invention will be described through the procedure of FIG. 8.

Referring to FIG. 8, the UE having the E-DCH set to 2ms TTI receives the E-SCCH in the same manner as the ACK / NACK timing to determine the maximum allowable transmission rate at the corresponding transmission time. On the other hand, when the E-DCH is a terminal having a 10ms TTI, the E-SCCH is received by the following procedure.

First, as shown in 801, the terminal sets a valid sub-frame section for receiving an E-SCCH. The valid sub-frame is set to a certain time interval from before T_uep time as proposed. Next, after receiving the E-SCCH in every sub-frame within the valid interval as shown in 802 and decoding it, it is checked whether there is E-SCCH information transmitted to itself as shown in 803. If the E-SCCH information transmitted to the user exists, the maximum allowable transmission rate is adjusted according to the newly allocated control information as shown in 804. Otherwise, the existing maximum allowable transmission rate is maintained as shown in 805.

<< Example 2 >>

In Embodiment 2, the UE receives only a specific sub-frame among the sub frames existing during the interval from the sub-frame immediately before the processing time required for transmitting the E-DCH. In this case, the specific section is allocated to the terminal through higher signaling. If a specific sub-frame is set within the valid period as described above, the UE attempts to receive the E-SCCH only in the designated sub-frame period, thereby reducing the processing power of the UE and in case of the base station, It has the effect of distributing numbers.

In the following Embodiment 2, a method in which the UE receives the E-SCCH only within a specific sub-frame period preset among all frames within the 10ms TTI which is the longest E-DCH TTI that the UE can transmit will be described. Pre-configured sub-frame information is given by higher layer signaling.

9 illustrates a method of receiving an E-SCCH according to the second embodiment. Hereinafter, Embodiment 2 will be described in detail with reference to FIG. 9. 9 assumes that the first sub-frame and the third sub-frame are set as valid sub-frames. In order to receive the scheduling information of the k + 4th TTI 908, the terminal sets the sub-frame 805 and the sub-frame 806 as valid sub-frames among the sub-frames received before the time point 921.

The operation of the base station in the second embodiment is the same as in the first embodiment. Operation of the terminal according to the second embodiment will be described in detail with reference to FIG. 10. In step 1001, the UE configures a valid subframe for receiving an E-SCCH.

In step 1002, it checks whether or not it is a valid sub-frame for every sub-frame. If it is not a valid sub-frame section, it waits until the next sub-frame section without attempting to receive an E-SCCH as in 1005. Perform the steps. If it is determined in step 1002 that it is a valid sub-frame, it proceeds to step 1003 to receive the E-SCCH. If there is scheduling information allocated to the corresponding UE in the valid sub-frame in step 1004, the procedure proceeds to step 1006 to adjust the maximum allowable transmission rate according to the scheduling information. Otherwise, the procedure proceeds to step 1007 to determine the existing maximum allowable transmission rate. Keep it.                     

11 is a diagram illustrating a configuration of a terminal according to the second embodiment. Hereinafter, FIG. 11 will be described in detail. The terminal has the following decoding chain in order to receive the E-SCCH carrying scheduling information. First, the descrambler 1110 descrambles a signal received through an antenna, and then transmits the descrambler 1110 to the E-SCCH spreader 1108. At this time, the E-SCCH reception controller 1101 has valid sub-frame information 1102 and controls the switch 1109 so that the UE does not perform a subsequent decoding procedure for other sub-frames. If the received sub-frame is a valid sub-frame, the despreader 1108 despreads the descrambled signal using Ces, which is a channel code of the E-SCCH.

Hereinafter, the demodulator 1107 demodulates the despread signal using Ces and outputs it to the derate matching unit 1106. The derate matched signal in the derate matching unit 1106 is decoded in the decoding unit 1105. The CRC checker 1104 checks the CRC using the Xue 1103, which is a UE identifier assigned to each terminal, and determines whether the received signal is information transmitted to the terminal. When the received signal is the scheduling information transmitted to the terminal, the control information is transmitted to the terminal E-DCH controller 1111 and the terminal E-DCH controller 1111 uses the scheduling control information to transmit the E-DCH of the corresponding TTI. Control the maximum bit rate for burnout.

In the present invention, a UE using a 10 ms TTI longer than a TTI of an E-SCCH in a system having a short transmission time period for a channel for transmitting scheduling information when a packet service is provided through a reverse transport channel has a shorter transmission time period than a reverse transmission channel. By setting the transmission time and the effective sub-frame interval that can receive this E-SCCH, the base station can flexibly transmit the E-SCCH information using the effective sub-frame interval, and the effective sub-frame interval can be adjusted according to the needs of the network. By setting differently, it is possible to distribute the signaling load of the E-SCCH.

Claims (28)

In the system for transmitting reverse data, the method for determining the transmission timing of the control information required for transmitting the reverse data, The transmission time interval (TTI) of the reverse data is set to 10 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, The base station sets the number of subframes of the common control channel as a valid period from a point in time before the processing period of the data to be transmitted to the K-th TTI to schedule the terminal to transmit data to the K-th TTI; , And transmitting scheduling information for a terminal to transmit data to the K-th TTI during the valid period. The method of claim 1, The valid period consists of five consecutive subframes, each set to a 2ms TTI within a 10ms interval. The method of claim 1, The valid period consists of a random number of consecutive subframes each set to 2 ms TTI within a 10 ms period, and the valid period information is configured through higher signaling. The method of claim 1, The common control channel may use the UE-id of the terminal to transmit scheduling control information to different terminals for each subframe. The method of claim 1, And the control information transmitted to the common control channel is an absolute scheduling assignment (SA). The method of claim 1, The control information transmitted to the common control channel is characterized in that the transmission rate control information of the increase / sustain / down and HARQ information such as ACK / NACK. In the system for transmitting reverse data, the method for transmitting the reverse data, The transmission time interval (TTI) of the reverse data is set to 10 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, The terminal receiving the common control channel during the valid period by setting a preset number of subframes of the common control channel from the time point before the processing period of the data to be transmitted to the K-th TTI as the valid period; Obtaining scheduling control information by decoding the received subframe of the common control channel; And generating and transmitting a data frame to be transmitted to the K-th TTI according to the scheduling control information. The method of claim 7, wherein The valid period consists of five consecutive subframes, each set to a 2ms TTI within a 10ms interval. The method of claim 7, wherein The valid period consists of a random number of consecutive subframes each set to 2 ms TTI within a 10 ms period, and the valid period information is configured through higher signaling. The method of claim 7, wherein The terminal receives the subframe of the common control channel during the validity period, and determines whether there is scheduling control information transmitted to the terminal for each subframe using the UE-id of the terminal. The method of claim 7, wherein The control information transmitted through the common control channel is characterized in that the absolute transmission rate (SA: Scheduling Assignment). The method of claim 7, wherein The control information transmitted to the common control channel is characterized in that the transmission rate control information of the increase / sustain / down and HARQ information such as ACK / NACK. In the system for transmitting reverse data, the method for determining the transmission timing of the control information required for transmitting the reverse data, The transmission time interval (TTI) of the reverse data is set to 10 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, The base station sets a specific subframe of the common control channel that exists before the processing interval of the data to be transmitted to the K-th TTI as a valid period for the terminal to schedule the terminal to transmit the data to the K-th TTI. Process, And transmitting scheduling information for a terminal to transmit data to the K-th TTI using the subframe. The method of claim 13, The valid period consists of one subframe set to a 2ms TTI within a 10ms interval. The method of claim 13, The valid period consists of a random number of consecutive subframes each set to 2 ms TTI within a 10 ms period, and the valid period information is configured through higher signaling. The method of claim 13, The common control channel may use the UE-id of the terminal to transmit scheduling control information to different terminals for each subframe. The method of claim 13, And the control information transmitted to the common control channel is an absolute scheduling assignment (SA). The method of claim 13, The control information transmitted to the common control channel is characterized in that the transmission rate control information of the increase / sustain / down and HARQ information such as ACK / NACK. In the system for transmitting reverse data, the method for transmitting the reverse data, The transmission time interval (TTI) of the reverse data is set to 10 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, Receiving, by the terminal, only a specific subframe of the common control channel existing at a point in time before a processing interval of data to be transmitted in K-th TTI; Obtaining scheduling control information by decoding the received subframe; And generating and transmitting a data frame to be transmitted to the K-th TTI according to the scheduling control information. The method of claim 19, The method as claimed in claim 1, wherein the specific subframe includes one subframe set to a 2ms TTI within a 10ms interval. The method of claim 19, The specific subframe consists of any number of subframes set to 2ms TTI within a 10ms interval, and the information on the subframes is configured through higher signaling. The method of claim 19, The terminal receives the common control channel in a specific subframe, and determines whether there is scheduling control information transmitted to the terminal for each subframe using the UE-id of the terminal. The method of claim 19, The control information transmitted through the common control channel is characterized in that the absolute transmission rate (SA: Scheduling Assignment). The method of claim 19, The control information transmitted to the common control channel is characterized in that the transmission rate control information of the increase / sustain / down and HARQ information such as ACK / NACK. In the system for transmitting reverse data, the method for determining the transmission timing of the control information required for transmitting the reverse data, The transmission time interval (TTI) of the reverse data is set to 10 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, The base station sets a predetermined number of subframes of the common control channel as a valid period for the first terminal and the second terminal in order to schedule reverse data transmission between the first terminal and the second terminal, If the first terminal to transmit data to the K-th TTI and the second terminal to transmit data to the N-th TTI are simultaneously scheduled during the first subframe period of the valid period, the first terminal may be scheduled according to a preset rule. Allocating one subframe to transmit scheduling information of a first terminal, and allocating a second subframe to transmit scheduling information of a second terminal within the valid period; And transmitting scheduling information for the first and second terminals using the allocated first and second subframes, respectively. The method of claim 25, The preset rule is characterized in that the determined according to the QoS of the data to be transmitted by each terminal. In the system for transmitting reverse data, the method for determining the transmission timing of the control information required for transmitting the reverse data, The transmission time period (TTI) of the reverse data of the first terminal is set to 10 ms, and the transmission time period (TTI) of the reverse data of the second terminal is set to 2 ms, The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, The base station sets a predetermined number of subframes of the common control channel as a valid period for the first terminal and the second terminal in order to schedule reverse data transmission between the first terminal and the second terminal, When the first terminal to transmit data to the K-th TTI and the second terminal to transmit data to the N-th TTI are simultaneously scheduled during the first subframe period of the valid period, the terminal is configured to 2 ms TTI. Allocating a first subframe to transmit scheduling information of a second terminal with priority, and allocating a second subframe to transmit scheduling information of a second terminal within the valid period; And transmitting scheduling information for the first and second terminals using the allocated first and second subframes, respectively. An apparatus for transmitting reverse data in a system for transmitting reverse data, the apparatus comprising: The transmission time interval (TTI) of the control information necessary for the reverse data transmission is set to 2ms, The channel for transmitting the control information necessary for the reverse data transmission is set to a common control channel shared by multiple terminals, In order to schedule the reverse data transmission of the terminal, a predetermined number of subframes of the common control channel existing before the processing interval of the data to be transmitted to the K-th TTI as a valid period for the terminal, A descrambler for descrambling a signal received through an antenna; A common control channel reception controller for controlling whether to receive the common control channel with the valid section information; A signal processor which despreads and decodes a received signal according to the control of the reception controller; A CRC checking unit for checking the signal processed signal using the UE-id of the UE, the CRC; And controlling reverse data transmission using control information acquired through a common control channel.

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