KR20050119619A - Method and apparatus for efficient scheduling of enhanced uplink dedicated channel in mobile telecommunication system - Google Patents

Abstract

The present invention proposes a method for efficiently allocating radio communication resources by a base station scheduler when an enhanced uplink dedicated transport channel is used. In addition, the present invention proposes a method for efficiently selecting a transmission rate of an enhanced uplink dedicated transport channel and a typical dedicated transport channel. In addition, the present invention proposes an operation of minimizing a change in the amount of interference generated by the terminal by maintaining the total transmission power of the terminal at the time of retransmission equal to the total transmission power of the terminal at the initial transmission regardless of the presence or absence of DCH. . In addition, we propose a power decision operation when the enhanced backward dedicated transport channel and the typical dedicated transport channel are used together.

Description

Efficient Scheduling Method and Apparatus for Enhanced Uplink Dedicated Channel in Mobile Communication System {METHOD AND APPARATUS FOR EFFICIENT SCHEDULING OF ENHANCED UPLINK DEDICATED CHANNEL IN MOBILE TELECOMMUNICATION SYSTEM}

The present invention relates to a cellular code division multiple access (CDMA) communication system, and more particularly, to an efficient scheduling method and apparatus for an enhanced uplink dedicated transport channel.

Third generation, based on the European system of Global Communications for Mobile Communications (GSM) and General Packet Radio Services (GPRS), and using Wideband Code Division Multiple Access (CDMA) UMTS (Universal Mobile Telecommunication Service) system, a mobile communication system, is a consistent service that enables mobile phone or computer users to transmit packet-based text, digitized voice or video, and multimedia data at high speeds of 2 Mbps or more anywhere in the world. To provide.

In particular, in the UMTS system, uplink-only enhancement is performed in order to further improve the performance of packet transmission in the reverse, that is, uplink (UL) communication from a user equipment (UE) to a base station (BS). A channel (Enhanced Uplink Dedicated Channel: hereinafter referred to as EUDCH or E-DCH) is used. In order to support more stable high-speed data transmission, the E-DCH includes techniques such as Adaptive Modulation and Coding (AMC), Hybrid Automatic Retransmission Request (HARQ), and base station control scheduling. Support.

AMC is a technology that improves the use efficiency of radio resources by determining the modulation method and coding method of the data channel according to the channel state between the base station and the terminal. The combination of modulation scheme and coding scheme is called MCS (Modulation and Coding Scheme), and various MCS levels can be defined according to the supported modulation scheme and coding scheme. That is, the AMC adaptively determines the level of the MCS according to the channel state between the terminal and the base station, thereby increasing the use efficiency of radio resources.

HARQ refers to a technique for retransmitting a packet to compensate for the error packet when an error occurs in an initially transmitted data packet. The complex retransmission technique includes a chase combining technique (hereinafter referred to as CC) that retransmits packets of the same format as the first transmission when an error occurs, and an incremental increment technique that retransmits packets having a different format than the initial transmission when an error occurs. (Incremental Redundancy: referred to as IR hereinafter).

In case of transmitting data using the E-DCH, the base station control scheduling determines whether the base station transmits uplink data and an upper limit of the possible data rate, and transmits the determined information to the terminal for scheduling. Refers to the information refers to a method of determining and transmitting the data rate of the uplink E-DCH.

1 is a diagram illustrating uplink packet transmission through an E-DCH in a typical wireless communication system.

Referring to FIG. 1, reference numeral 100 denotes a base station that supports an E-DCH, that is, Node B (hereinafter, the base station and node B are used interchangeably), and reference numerals 101, 102, 103, and 104 denote E. Indicates UEs using DCH. As shown, the terminals 101 to 104 transmit data to the base station 100 through the E-DCHs 111, 112, 113, and 114, respectively.

The base station 100 informs whether or not EUDCH data transmission is possible for each terminal by using the data buffer status, request data rate, or channel state information of the terminals 101 to 104 using the E-DCH, or provides the EUDCH data rate. Perform the scheduling operation to adjust. At this time, the scheduling is to increase the performance of the system as a whole, so that the terminal station far away from the base station (e.g., 103, Noise Rise or Rise over thermal, RoT) value does not exceed the target value A low data rate is allocated to 104 and a high data rate is assigned to nearby terminals (eg, 101 and 102).

2 is a message flow diagram illustrating a transmission and reception procedure through a typical E-DCH.

Referring to FIG. 2, in step 202, the Node B and the UE configure an E-DCH. The configuration process 202 includes the delivery of messages over a dedicated transport channel. If the E-DCH is configured, the UE informs the Node B of the scheduling information as in step 204. The scheduling information includes terminal transmission power information indicating reverse channel information, extra power information that can be transmitted by the terminal, and an amount of data to be transmitted in a buffer of the terminal.

Receiving scheduling information from a plurality of terminals in communication, Node B monitors scheduling information transmitted from the plurality of terminals in step 206 to schedule data transmission of each terminal. In detail, in step 208, the Node B determines to allow backward packet transmission to the UE, and transmits scheduling assignment information to the UE. The scheduling allocation information includes information on an allowed data rate, timing of transmission and the like.

The UE determines a transport format (TF) of the E-DCH to be transmitted in the reverse direction by using the scheduling assignment information in step 210, and transmits reverse (UL) packet data through the E-DCH in step 212. At the same time, the TF information is transmitted to the Node B through the E-DCH. Here, the TF information includes a transport format resource indicator (hereinafter referred to as TFRI) indicating information necessary for demodulating the E-DCH. In this case, the terminal selects the MCS level in consideration of the data rate and channel state allocated by the base station, and transmits the reverse packet data using the MCS level.

In step 216, node B determines whether there is an error in the TF information and the packet data. In step 218, Node B receives NACK (Negative Acknowledge) if an error occurs in any one of the determination results, or ACK (Acknowledge) if no error occurs. Send to the terminal. When the ACK information is transmitted, the UE transmits new EUDCH data through the E-DCH when the packet data is transmitted, but when the NACK information is transmitted, the UE retransmits the same EUDCH data through the E-DCH.

As described above, the conventional Node B measures and predicts the sum of Rise over thermal (RoT) used in the cell, and E-DCH replaces the extra RoT not used within the maximum allowable RoT range in the cell. To allocate.

Therefore, in order to improve system performance, resources that can be allocated for the E-DCH, that is, the extra RoT should be optimized. In addition, there is a need for a method of reasonably measuring and predicting the total RoT being used. That is, conventionally, the total amount of RoT currently in use is excessively measured and predicted to reduce the resources that can be allocated for the E-DCH, resulting in a problem of deteriorating the overall system. In addition, since an efficient resource allocation method between the E-DCH and the DCH, which may exist at the same time, is not conventionally proposed, there is a possibility that a problem of failing to satisfy the service quality of the existing DCH may occur.

SUMMARY OF THE INVENTION An object of the present invention, which was devised to solve the problems of the prior art operating as described above, is a method for efficiently allocating radio communication resources by a base station scheduler in a mobile communication system used by an enhanced uplink dedicated transport channel; To provide a device.

Another object of the present invention is to provide a method and apparatus for efficiently selecting a transmission rate of an enhanced reverse dedicated transport channel and a transmission rate of a typical dedicated transport channel by a terminal using both an enhanced reverse dedicated transport channel and a typical dedicated transport channel.

It is still another object of the present invention to provide a method and apparatus for determining a transmission rate of a terminal using both an enhanced reverse dedicated transport channel and a typical dedicated transport channel, without restricting the dedicated transport channel.

Another object of the present invention is to maintain the total transmission power of the terminal equal to the total transmission power of the terminal at the initial transmission, regardless of the presence or absence of the DCH at the time of re-transmission of the E-DCH, so that the terminal generates uplink It is to provide a method and apparatus for minimizing changes in the amount of interference.

Another object of the present invention is to reduce the power of the enhanced reverse dedicated transport channel while maintaining the power of the typical dedicated transport channel when an instantaneous power shortage occurs in a terminal using both the enhanced reverse dedicated transport channel and the typical dedicated transport channel. It is to provide a method and apparatus.

Method according to an embodiment of the present invention, in a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH).

Determining a transmission rate of the DCH in consideration of radio resource information commonly allocated to the E-DCH and an uplink dedicated channel (hereinafter referred to as DCH);

The transmission rate of the E-DCH is determined in consideration of radio resource information commonly allocated to the E-DCH and the DCH and the transmission rate of the determined DCH.

According to an embodiment of the present invention, an apparatus for transmitting an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, E-DCH) is provided.

A DCH rate controller for determining a transmission rate of the DCH in consideration of radio resource information commonly allocated to the E-DCH and an uplink dedicated channel (hereinafter referred to as DCH);

A DCH transmitter for transmitting DCH data at the determined rate;

An E-DCH rate controller for determining a transmission rate of the E-DCH in consideration of radio resource information commonly allocated to the E-DCH and the DCH and the determined rate of the DCH;

An E-DCH transmitter for transmitting E-DCH data at the determined transmission rate;

A DCH data buffer for storing DCH data to be transmitted,

E-DCH data buffer for storing the E-DCH data to be transmitted.

According to another embodiment of the present invention, a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH),

When the E-DCH to be retransmitted, the transmission power for the E-DCH of the terminal used at the initial transmission time,

The transmission power of the additional channel first generated at the retransmission time is subtracted from the sum of the total transmission power excluding the E-DCH transmission power of the terminal used during the initial transmission plus the marginal power due to the channel not generated at the retransmission time. Resetting the rosin power of the E-DCH to be retransmitted to a value.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. 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.

The embodiment to be described below relates to an enhanced uplink dedicated transport channel (E-DCH) of a UMTS communication system. For convenience of description, the uplink considers the DCH and E-DCH channels. Since the transmission power and data rate described in the present invention generally have a one-to-one relationship, they will be used interchangeably within the scope of not impairing the meaning.

First, as mentioned in the related art, in order to prevent inefficient RoT use of a base station, a method of rationally measuring and predicting the total RoT being used in a cell is required. That is, the base station may use as much as the difference between the maximum allowable RoT in the cell and the total RoT used in the cell as the RoT for the E-DCH for the UEs to use the E-DCH in the cell. Here, the maximum RoT allowable in the cell is signaled from the Radio Network Controller (RNC) to the base station. The total RoT used in the cell is composed of RoT by DCH and other common channels. However, in the case of DCH, the UE selects a transmission rate (or transmission power) of the DCH within a range of a transport format combination set (TFCS) signaled from the base station. Therefore, the base station cannot know in advance the exact transmission rate (or transmission power) of each terminal at a particular point in time. Therefore, accurate prediction of RoT by DCH becomes difficult. However, the base station can only know the corresponding RoT from the maximum transmission rate (or transmission power) allowed for each terminal.

If the base station calculates the RoT being used in the cell in consideration of the maximum transmission rate (or transmission power) allowed for the respective terminals, the RoT resource that can be allocated to the E-DCH is reduced. This is because the DCH transmitted by each UE is not always transmitted by selecting a maximum transmission rate (or transmission power) within a range of a transport format combination set (TFCS) signaled from a base station. Therefore, in the present invention, it is intended to reasonably predict the DCH RoT used in the cell by using the statistical characteristics of the DCH transmission rate (or transmission power) of each terminal.

The RNC monitors the transmission rate (or transmission power) for each terminal in a cell for a certain time interval or can know statistical characteristics of the transmission rate (or transmission power) for each terminal by prior experiment. have. The statistical characteristic can be used to estimate an average data rate and reasonably predict the DCH RoT based on this. The scheduling optimization coefficient for each terminal to efficiently utilize the uplink RoT resources, α _i (0 ≤ α _i ≤ 1, the scheduling optimization coefficient corresponding to the i-th terminal) of the average transmission rate compared to the maximum transmission rate allowed for each terminal We define it as a ratio and reasonably predict the DCH RoT. The RNC signals the calculated scheduling optimization coefficient or the estimated average transmission rate to the base station and uses the base station to predict the DCH RoT. As described above, an RNC managing resource of each UE is used as the subject of DCH RoT prediction, but the base station Node B may predict the DCH RoT according to the choice of the implementer.

Hereinafter, an embodiment of calculating the scheduling optimization factor will be described.

[Example of calculating the scheduling optimization factor]

The scheduling optimization coefficient may be expressed as a ratio of the maximum DCH transmission rate (or transmission power) to the average DCH transmission rate (or transmission power) of each terminal.

I is an index indicating each terminal, j is an index of a transmission format combination. Is the average DCH transmission rate (or transmission power) of the terminal i, Pr (DCHi, j) is the probability of generating the DCH of the terminal i having a transmission format combination j, Is the transmission rate (or transmission power) of the terminal i having the transmission format combination j. Denotes DCH maximum transmission rate (or transmission power) of UE i.

Hereinafter, a method of generating a scheduling command for each terminal by the base station will be described with reference to FIG. 3.

3 is a flowchart illustrating a method for generating a scheduling command for each terminal by a base station according to the present invention.

Referring to FIG. 3, in step 301, a base station calculates a total RoT corresponding to a DCH transmission rate (or transmission power) that each terminal is expected to transmit. This is calculated as the sum of the product of the scheduling optimization coefficient for each terminal and the RoT corresponding to the maximum transmission rate (or transmission power) of each terminal. Through this, it is possible to prevent the waste of RoT that can occur by calculating too high RoT in the cell. RoT by other uplink common channels can also be calculated.

In step 302, the base station uses the difference between the maximum RoT allowed in the cell and the total RoT calculated in step 301 as the total RoT that can be allocated to the E-DCH in the cell. In this case, the RoT sum calculated in step 301 includes the RoT sum for the DCH calculated according to the present invention, and may additionally include the RoT sum for the common channels. Here, the maximum RoT allowed in the cell is a value signaled from the RNC to the base station.

In step 303, the base station considers the maximum E-DCH transmission rate (or transmit power) of each terminal according to the E-DCH scheduling information received from each terminal, and the total RoT sum is assigned to the E-DCH in the cell. In order not to exceed, the maximum transmission rate (or transmission power) of each terminal is obtained.

In step 304, the base station generates scheduling assignment information for each terminal from the maximum E-DCH transmission rate for each terminal calculated in step 303. In this case, the scheduling allocation information is as follows.

Information 1 is 'the maximum transmit rate of each terminal including the DCH and E-DCH'. That is, the terminal determines the DCH rate and the E-DCH rate within the range of the rate.

Information 2 is a 'maximum E-DCH transmission rate for each terminal' (step 303 of Figure 3) and 'scheduling optimization coefficient for each terminal'. Each of the UEs can obtain the same information as the information 1 by calculating the 'E-DCH maximum data rate plus a scheduling optimization factor and multiplying the DCH maximum data rate,' and the DCH maximum data rate is a signal signaled to the UE from the RNC.

Information 3 is 'DCH transmission rate that each terminal is expected to transmit on average' (step 301 of FIG. 3) and 'E-DCH maximum transmission rate for each terminal' (calculated in step 303). Here, each terminal can obtain the same information as information 1 from the sum of the two values.

Information 4 is the sum of DCH maximum data rate and E-DCH maximum data rate of each UE. The E-DCH maximum data rate is not a value calculated in consideration of the DCH data rate that each UE is expected to transmit on average, but a value calculated in consideration of the DCH maximum data rate of each UE.

Information 5 is the E-DCH maximum data rate. The E-DCH maximum data rate is not a value calculated in consideration of the DCH data rate that each UE is expected to transmit on average, but is a value calculated in consideration of the DCH maximum data rate of each UE. In addition, the terminal generates information corresponding to the information 4 using the transport format combination set (TFCS) signaled from the base station.

Each terminal may know 'maximum transmittable transmission rate of each terminal including DCH and E-DCH' through the information 1, information 2 and information 3. If a maximum transmission rate is allocated for each transmission channel, the remaining transmission rate used by each transmission channel cannot be used by other channels, and thus, efficient resource utilization cannot be performed. However, if each UE knows the 'maximum transmittable rate of each UE including the DCH and the E-DCH', the UE flexibly determines the transmit rate of the DCH and the E-DCH within the maximum transmittable rate to efficiently utilize resources. Can be achieved. In addition, through the information 4 and 5, the UE provides a method for flexibly determining the transmission rates of the DCH and the E-DCH within the maximum transmittable transmission rate to achieve efficient resource utilization.

Hereinafter, a method of determining a DCH rate and an E-DCH rate by the UE will be described with reference to FIG. 4.

4 is a flowchart illustrating a method of determining a data rate by a terminal according to the present invention.

Referring to FIG. 4, in step 400, the terminal calculates a total sum of transmit powers that can be transmitted through scheduling allocation information received from a base station.

In step 401, the UE determines the transmission rate of the DCH. In general, since the DCH has a high priority such as voice data, the DCH is determined regardless of the presence or absence of the E-DCH. That is, in the case of DCH, the terminal selects the transmission rate (or transmission power) of the DCH in consideration of the total transmission power that the terminal can transmit in the transport format combination set (TFCS) signaled from the base station. Here, the sum of the transmission powers includes the amount of DCH data in the buffer of the terminal, the currently available transmission power, the currently available transmission format combination set (TFCS), and the capability of the terminal.

In step 402, the terminal compares the total of the transmission power (maximum transmittable transmission rate of the terminal including the allocated 'DCH and E-DCH) and the transmission power limit value of the terminal. If the total sum of the transmit powers that the terminal can transmit is less than or equal to the transmit power limit, the flow proceeds to step 403.

In step 403, the terminal compares whether the difference between the total sum of the transmission powers and the DCH transmission rate (or transmission power) 'determined in step 401 is greater than 0, and proceeds to step 404. In step 404, the terminal determines the difference between the sum of the transmission powers and the DCH transmission rate as the maximum E-DCH transmission rate, and proceeds to step 409. In step 409, the UE determines the E-DCH transmission rate within the range of the maximum E-DCH transmission rate.

If the difference between the sum of the transmission powers and the DCH transmission rate determined in step 401 is less than or equal to 0 in step 403, the process proceeds to step 405. In step 405, the terminal determines that the maximum transmission rate of the E-DCH is 0 because no available transmission power remains, and in step 409, Tamar does not transmit data to the E-DCH.

The 'transmission power limit value' of the terminal is an upper limit value of the terminal's transmission power allowed by the power amplifier of the terminal, and means that transmission is impossible with physically higher power.

That is, in step 402, if the transmission power limit value of the terminal is greater than the total of the transmission power (the maximum transmit rate of the terminal including the allocated 'DCH and E-DCH'), the process proceeds to step 406.

In step 406, the UE compares the transmission power limit value with the DCH transmission rate (or transmission power) determined in step 401, and if the transmission power limit value is large, proceeds to step 407, and if it is smaller than or equals, proceeds to step 408.

In step 407, the terminal finally sets the difference between the 'transmission power limit value' and 'the DCH transmission rate (or transmission power) determined by the actual terminal to be transmitted' as the maximum transmission rate of the E-DCH that the terminal can transmit. do.

In step 408, since it is impossible for the UE to determine the DCH transmission rate beyond the 'transmission power limit value', it is necessary to adjust the transmission power of the DCH. That is, the terminal sets the DCH transmission rate to the 'transmission power limit value' of the terminal, and since there is no more available transmission power, the UE proceeds to step 405 and determines the maximum transmission rate of the E-DCH to '0'. In step 409, the UE does not transmit the E-DCH.

On the other hand, in the situation of transmitting data by determining the transmission rate of the DCH and the E-DCH through the above procedure, a situation in which the E-DCH needs to be retransmitted by HARQ operation may occur. However, if there is no DCH at the time of retransmission and only the E-DCH is present, by adding the power occupied by the DCH to the E-DCH and transmitting it, the total transmission power level generated by the terminal is kept constant and the base station scheduler is maintained. Can operate stably. That is, the transmit power (Tx_power_E-DCH) reset for the E-DCH during retransmission is retransmitted with the transmit power (Tx_power_E-DCH_init) used for the E-DCH during initial transmission and the transmit power used for the DCH during initial transmission. It is expressed as the sum of Tx_power_DCH_init that has not occurred and is shown in Equation 2.

Tx_power_E-DCH = Tx_power_E-DCH_init + Tx_power_DCH_init

In addition, in a situation in which only the E-DCH is transmitted during initial transmission, if a DCH occurs at the time of retransmission of the E-DCH by HARQ operation, the transmission power of the generated DCH is used as much as the DCH transmission rate and the initial transmission is performed. The value reduced by the DCH transmission power from the transmission power allocated to the time E-DCH is referred to as the E-DCH transmission power at the time of retransmission. Therefore, the total transmission power level of the terminal at the time of retransmission can be kept the same as the total transmission power level of the terminal at the initial transmission, and the base station scheduler can be stably operated. That is, the transmission power (Tx_power_E-DCH) reset for the E-DCH at the time of retransmission is not the initial transmission at the transmission power (Tx_power_E-DCH_init) used for the E-DCH at the time of initial transmission, but the DCH occurred at the time of retransmission. It is expressed as the sum of the transmission powers (Tx_power_DCH) allocated for the purpose of Equation 3 below.

Tx_power_E-DCH = Tx_power_E-DCH_init-Tx_power_DCH

As shown in Equation 3 and Equation 4, E-DCH transmission power of the terminal at the time of retransmission is generalized as shown in Equation 4 below.

Tx_power_E-DCH = Tx_power_E-DCH_init + △ _release-△ _add

That is, the retransmission power Tx_power_E-DCH reconfigured for the E-DCH is the transmission power Tx_power_E-DCH_init for the E-DCH of the UE at the initial transmission time, and the E used during the initial transmission of the total transmission power. -The sum of the extra powers (△ _release) that did not occur at the retransmission time in the transmit power except for the DCH, is equal to the value obtained by subtracting the transmit power (△ _add) of the additional channel generated at the time of the E-DCH retransmission after being added to the initial transmission. .

In the above description, the method of setting the E-DCH transmission power in consideration of the relationship between initial transmission and retransmission of the E-DCH has been described. However, when the number of retransmissions of the E-DCH is one or more times, the E-DCH transmission power determination method may be used whenever additional retransmission occurs. For example, if the maximum number of retransmissions is defined as 4 times, there is a DCH in the first retransmission of the E-DCH and no DCH in the third retransmission, or no DCH in the first retransmission of the E-DCH. Even when the DCH is present in the second retransmission, the retransmission power of the E-DCH may be set using Equation 4 above.

In addition, in the detailed description of the present invention, the DCH transmission power is always reflected in the retransmission power setting of the E-DCH. However, in consideration of the transmission rate of the E-DCH, it may be variably applied within the DCH transmission power range. For example, if the retransmission transmit power of the E-DCH needs to be increased, that is, the DCH does not exist at the time of retransmission of the E-DCH, and the transmission rate of the E-DCH is high, all of the transmit powers used for the DCH are set to E. -Apply to DCH transmission power setting. On the other hand, when the transmission rate of the E-DCH is high, the transmission power used for the DCH may be applied to some E-DCH transmission power settings, or the E-DCH may be transmitted by maintaining the previous transmission power.

5 is a flowchart illustrating a method for determining transmission power by a terminal according to the present invention.

After the UE determines the transmission rates of the DCH and the E-DCH, a situation in which the corresponding instantaneous power of the UE increases. For example, when the channel condition is not good, the instantaneous transmission power of the terminal may be increased by the power control operation.

Referring to FIG. 5, in step 501, the 'transmission power limit value' of the terminal, the sum of the instantaneous transmission power corresponding to the DCH transmission rate and the E-DCH transmission rate, is the upper limit of the terminal transmission power allowed by the power amplifier of the terminal. Determine if it is exceeded.

As a result of the determination, if the 'sum of instantaneous transmission power corresponding to the DCH transmission rate and the E-DCH transmission rate' does not exceed the transmission power limit value of the terminal, the terminal proceeds to step 507 and does not readjust the transmission power of the terminal.

If the determination result is exceeded, the terminal prioritizes the DCH in step 502 to maintain the DCH transmission power as it is, and in step 503 readjusts the transmission power of the E-DCH. Through this, DCH related operation minimizes the influence of the E-DCH. Specifically, the transmission power for the E-DCH is adjusted by reducing the 'transmission power limit value' of the terminal to 'the sum of the instantaneous transmission power corresponding to the DCH transmission rate and the E-DCH transmission rate'. That is, the terminal reduces the transmission power of the E-DCH by the transmission power exceeding the 'transmission power limit value'.

In step 504, if the adjusted E-DCH transmission power value is a positive value, the terminal proceeds to step 505. In step 505, the UE transmits the E-DCH at a data rate corresponding to the adjusted E-DCH transmission power value.

In step 504, if the adjusted E-DCH transmission power value is not a positive value, the terminal proceeds to step 506. In step 506, since the power value may not have a negative value, the terminal does not finally transmit the E-DCH.

6 is a diagram illustrating a configuration of an apparatus for transmitting scheduling assignment information of a base station according to the present invention.

Referring to FIG. 6, a base station scheduler includes a scheduling signal transmission controller 601, a scheduling signal generator 602, and a scheduling signal transmitter 603.

The scheduling signal transmission controller 601 controls the scheduling signal generator 602 and the scheduling signal transmitter 603 so that the scheduling signal can be transmitted at a predetermined scheduling signal transmission time.

The scheduling signal generator 602 generates a scheduling signal in consideration of RoT corresponding to an average DCH transmission rate expected to be transmitted by each terminal, maximum RoT allowed in a cell, and E-DCH scheduling information of each terminal. Here, the RoT corresponding to the average DCH transmission rate predicted to be transmitted by the terminal may be signaled from the RNC to the base station. Alternatively, RoT corresponding to the average DCH transmission rate predicted to be transmitted by the UE may be calculated from the scheduling optimization coefficient of each UE signaled from the RNC to the base station and the maximum DCH transmission rate allowed for each UE signaled from the RNC to the base station. The maximum RoT information allowed in the cell is a value signaled from the RNC to the base station. In addition, the RoT corresponding to the average DCH rate and the scheduling optimization coefficient of each terminal may be calculated and used by the base station. The operation of generating a scheduling command for each terminal by the base station according to the present invention is performed by the scheduling signal generator 602. The scheduling signal transmitter 603 encodes the generated scheduling signal and modulates the transmission.

7 is a diagram illustrating the configuration of a data rate determining apparatus and a transmission power control apparatus of a terminal according to the present invention. For convenience of description, channels other than DCH and E-DCH are omitted.

Referring to FIG. 7, the terminal receives scheduling allocation information from the base station and demodulates / decodes the scheduling allocation information in the demodulation / decoder 702 to read scheduling allocation information. Here, the scheduling allocation information includes at least one of the above-described information 1, information 2, information 3, and information 4.

Through this, the UE determines the E-DCH rate determiner 703 'the maximum transmit rate (or transmit power) of the UE including the DCH and the E-DCH'. On the other hand, since the transmission rate of the DCH is determined regardless of the presence or absence of the E-DCH, the DCH rate determiner 706 is 'the maximum transmission rate (or transmit power) of the terminal including the DCH and the E-DCH', the DCH data of the terminal buffer The DCH transmission rate is determined in consideration of the amount, the currently available transmission format combination set (TFCS), and the capability of the terminal. In this case, the DCH rate determiner 706 receives the DCH data amount of the UE buffer from the DCH data buffer 705 and uses the DCH rate determiner.

Once the DCH rate is determined, the DCH transmission controller 707 determines the DCH transmission format and applies it to the DCH data transmitter 708. In addition, the DCH transmission format is transmitted through a dedicated physical control channel (DPCCH) which is a physical control channel for the DCH. The DCH data transmitter 708 takes a designated amount of data from the DCH data buffer 705 according to the DCH transmission format, and transmits it through a dedicated physical data channel (DPDCH), which is a physical data channel for the DCH through channel coding and modulation. do. The transmission rate of the E-DCH is 'the maximum transmission rate (or transmission power) of the terminal including the DCH and the E-DCH', the DCH transmission rate (or transmission power) determined by the DCH transmission rate determiner 706, and the E-DCH data. The amount of data in the buffer 701 is determined. In a specific method of determining an E-DCH rate, the UE described with reference to FIG. 4 follows a procedure of determining an E-DCH rate. When the E-DCH transmission rate is determined, the E-DCH transmission controller 704 determines the E-DCH transmission format and applies it to the E-DCH packet transmitter 709. In addition, the E-DCH transmission format is transmitted through an enhanced dedicated physical control channel (E-DPCCH), which is a physical control channel for the E-DCH. The E-DCH packet transmitter 709 obtains a specified amount of data from the E-DCH data buffer 701 according to the E-DCH transmission format, and then performs channel coding and modulation to E-DCH, which is a physical data channel for the E-DCH. Transmits through an enhanced dedicated physical data channel (DPDCH).

 On the other hand, the instantaneous transmission power of the terminal may increase to exceed the 'transmission power limit value' of the terminal, which is the upper limit of the terminal transmission power allowed by the power amplifier of the terminal. In this case, the transmission power controller 710 adjusts the transmission power of each channel and reflects it in a gain factor multiplied by each channel to allow the terminal to operate within the 'transmission power limit value'. At this time, while the transmission power for the DCH remains unchanged, the UE reduces the transmission power for the E-DCH by the amount of power exceeding the 'transmission power limit value' and transmits the same.

As described above, only the information 1 has been described in the detailed description of the present invention. However, even when using information 2 to information 5, the same or corresponding effects in achieving the object of the present invention can be obtained. And, of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, when the enhanced uplink dedicated transport channel is used, the base station scheduler can efficiently allocate radio communication resources. In addition, there is an effect that the terminal can efficiently select the transmission rate of the E-DCH and the transmission rate of the DCH. In addition, regardless of the presence or absence of the DCH at the time of retransmission, it is possible to minimize the change in the amount of interference generated by the terminal uplink by maintaining the same as the total transmission power of the terminal at the initial transmission.

In addition, when both the E-DCH and the DCH is used, if an instantaneous power shortage occurs, the power of the E-DCH may be readjusted while maintaining the power of the DCH.

1 illustrates uplink packet transmission over an E-DCH in a typical wireless communication system.

2 is a message flow diagram illustrating a transmission and reception procedure through a typical E-DCH.

3 is a flowchart illustrating a method for generating a scheduling command for each terminal by a base station according to the present invention;

4 is a flowchart illustrating a method of determining a data rate by a terminal according to the present invention.

5 is a flowchart illustrating a method of determining transmission power by a terminal according to the present invention.

6 is a diagram illustrating a configuration of an apparatus for transmitting scheduling assignment information of a base station according to the present invention.

7 is a diagram illustrating the configuration of a data rate determining apparatus and a transmission power control apparatus of a terminal according to the present invention.

Claims (45)

In a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH) Determining a transmission rate of the DCH in consideration of radio resource information commonly allocated to the E-DCH and an uplink dedicated channel (hereinafter referred to as DCH); And determining the transmission rate of the E-DCH in consideration of radio resource information commonly allocated to the E-DCH and the DCH and the transmission rate of the determined DCH. The method of claim 1, If the instantaneous power of the uplink channel exceeds the maximum transmit power of the terminal, the instantaneous power of the uplink channel is adjusted so that the instantaneous power of the uplink channel does not exceed the maximum transmit power of the terminal. The method of claim 1, Radio resource information commonly allocated to the E-DCH and the DCH is a sum of RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE and the maximum E-DCH transmission rate of each UE, and the E-DCH and DCH The radio resource information commonly assigned to the method is characterized in that transmitted from the base station. The method of claim 1, The radio resource information commonly allocated to the E-DCH and the DCH is calculated from an E-DCH maximum transmission rate for each terminal and an optimization coefficient for each terminal, and the information is transmitted from a base station. The method of claim 1, Radio resource information commonly allocated to the E-DCH and the DCH is a sum of RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal and the maximum transmission rate of the E-DCH of each terminal, and the information is respectively obtained from the base station. Said method characterized in that it is transmitted. The method of claim 1, The radio resource information commonly allocated to the E-DCH and the DCH is information on the sum of the maximum DCH rate and the maximum E-DCH rate of each UE, and the maximum E-DCH rate of the UE considers the maximum DCH rate of each UE. And the information is transmitted from the base station. The method of claim 1, The radio resource information commonly allocated to the E-DCH and the DCH is E-DCH maximum data rate information of each UE transmitted from the base station. In this case, the E-DCH maximum data rate is a value calculated in consideration of the DCH maximum data rate of each UE. In addition, the terminal uses a transport format combination set (TFCS) transmitted from the base station to determine the maximum transmission rate of the DCH and the E-DCH maximum transmission rate of each terminal, which is radio resource information commonly allocated to the E-DCH and the DCH. Generating information about the sum. The method of claim 4, wherein The optimization coefficient for each terminal is calculated as a ratio of the maximum DCH maximum transmission rate (or transmission power) to the DCH average transmission rate (or transmission power) of each terminal. The method according to any one of claims 3 to 5, The maximum DCH transmission rate of each terminal is calculated by multiplying the optimization coefficient for each terminal and RoT corresponding to the maximum transmission rate (or transmission power) of each terminal in consideration of the DCH transmission rate (or transmission power) predicted to be transmitted by the terminal. Characterized in that the method. An apparatus for transmitting an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, referred to as E-DCH). A DCH rate controller for determining a transmission rate of the DCH in consideration of radio resource information commonly allocated to the E-DCH and an uplink dedicated channel (hereinafter referred to as DCH); A DCH transmitter for transmitting DCH data at the determined rate; An E-DCH rate controller for determining a transmission rate of the E-DCH in consideration of radio resource information commonly allocated to the E-DCH and the DCH and the determined rate of the DCH; An E-DCH transmitter for transmitting E-DCH data at the determined transmission rate; A DCH data buffer for storing DCH data to be transmitted, And an E-DCH data buffer for storing E-DCH data to be transmitted. The method of claim 10 When the instantaneous power of the uplink channel exceeds the maximum transmission power of the terminal, the transmission power to readjust the instantaneous power so that the instantaneous power of the uplink channel does not exceed the maximum transmission power of the terminal by adjusting the transmission rate of the E-DCH Further comprising a controller. The method of claim 10, The radio resource information commonly allocated to the E-DCH and the DCH is a sum of RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal and the maximum E-DCH transmission rate of each terminal. The device characterized in that the radio resource information commonly assigned to the DCH is transmitted from the base station. The method of claim 10, The radio resource information commonly allocated to the E-DCH and the DCH is calculated from an E-DCH maximum transmission rate for each terminal and an optimization coefficient for each terminal, and the information is transmitted from a base station. The method of claim 10, Radio resource information commonly allocated to the E-DCH and the DCH is a sum of RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal and the maximum transmission rate of the E-DCH of each terminal, and the information is respectively obtained from the base station. Said device characterized in that it is transmitted. The method of claim 10, The radio resource information commonly allocated to the E-DCH and the DCH is information on the sum of the maximum DCH rate and the maximum E-DCH rate of each UE, and the information is transmitted from a base station. The apparatus, characterized in that the calculated value in consideration of the maximum DCH transmission rate of the terminal. The method of claim 10, The radio resource information commonly allocated to the E-DCH and the DCH is E-DCH maximum data rate information of each UE transmitted from the base station. In this case, the E-DCH maximum data rate is a value calculated in consideration of the DCH maximum data rate of each UE. In addition, the terminal uses a transport format combination set (TFCS) transmitted from the base station to determine the maximum transmission rate of the DCH and the E-DCH maximum transmission rate of each terminal, which is radio resource information commonly allocated to the E-DCH and the DCH. Generating information about the sum. The method of claim 13, The apparatus of claim 1, wherein the optimization coefficient for each terminal is calculated as a ratio of the maximum DCH transmission rate (or transmission power) to the DCH average transmission rate (or transmission power) of each terminal. The method according to any one of claims 12 to 14, The maximum DCH transmission rate of each terminal is calculated from the product of the optimization coefficient for each terminal and RoT corresponding to the maximum transmission rate (or transmission power) of each terminal in consideration of the DCH transmission rate (or transmission power) that the terminal is expected to transmit. Said device. In a method for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, E-DCH). Calculating RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE; Calculating the maximum E-DCH transmission rate of each terminal by using RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal; Generating radio resource information commonly allocated to the E-DCH and the DCH of each UE from the sum of RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE and the maximum E-DCH transmission rate of each UE; , And transmitting radio resource information commonly allocated to the E-DCH and the DCH of each terminal to the terminal. In a method for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, E-DCH). Calculating RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE; Calculating an optimization coefficient of each terminal by using RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal; Calculating the maximum E-DCH transmission rate of each terminal by using RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal; And transmitting the optimization coefficient of each terminal and the maximum E-DCH transmission rate of the terminal to the terminal. A method for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, referred to as E-DCH), Calculating RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE; Calculating the maximum E-DCH transmission rate of each terminal by using RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each terminal; And transmitting the RoT information corresponding to the average DCH transmission rate predicted to be transmitted by each terminal and the maximum E-DCH transmission rate of the terminal to the terminal. A method for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, referred to as E-DCH), Confirming the maximum DCH rate of each UE; Calculating the maximum E-DCH transmission rate of each terminal using the maximum DCH transmission rate of each terminal; Generating radio resource information commonly allocated to the E-DCH and the DCH of each terminal from the sum of the maximum DCH rate of each terminal and the maximum E-DCH maximum rate of each terminal; And transmitting radio resource information commonly allocated to the E-DCH and the DCH of each terminal to the terminal. A method for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, referred to as E-DCH), Calculating the maximum E-DCH transmission rate of each terminal using the maximum DCH transmission rate of each terminal; And transmitting radio resource information commonly allocated to the E-DCH and the DCH of each terminal to the terminal. The method of claim 20, The optimization coefficient for each terminal is calculated as a ratio of the maximum DCH transmission rate (or transmission power) to the DCH average transmission rate (or transmission power) of each terminal. The method according to any one of claims 19 to 23, The maximum DCH rate of each terminal takes into account the DCH rate (or transmit power) predicted to be transmitted by the terminal, calculated from the product of the optimization coefficient for each terminal and RoT corresponding to the maximum DCH rate (or transmit power) of each terminal. The method as characterized in that the calculated. An apparatus for scheduling an uplink dedicated transport channel in a mobile communication system used by an enhanced uplink dedicated transport channel (hereinafter, referred to as E-DCH). A scheduling signal for generating a scheduling signal for each terminal using information on RoT corresponding to an average DCH transmission rate predicted to be transmitted by each terminal, maximum RoT information allowed in a cell, and E-DCH scheduling information of each terminal. With generator, A scheduling signal transmitter for transmitting the generated scheduling signal; Said scheduling signal generator (602) and a scheduling signal transmission controller for controlling a scheduling signal transmitter. The method of claim 26, The scheduling signal generator,  Generates radio resource information commonly allocated to the E-DCH and the DCH, and the radio resource information commonly allocated to the E-DCH and the DCH includes RoT information corresponding to an average DCH transmission rate predicted to be transmitted by each UE and The apparatus characterized in that the sum of the maximum E-DCH transmission rate of the terminal. The method of claim 26, wherein the scheduling signal generator, The apparatus of claim 1, wherein the maximum E-DCH transmission rate for each terminal and the optimization coefficient for each terminal are calculated. The method of claim 26, wherein the scheduling signal generator, The apparatus characterized in that the sum of the RoT information corresponding to the average DCH transmission rate that each terminal is expected to transmit and the maximum E-DCH transmission rate of each terminal. The method of claim 26, wherein the scheduling signal generator, And generating information on the sum of the DCH maximum data rate and the E-DCH maximum data rate of each UE, wherein the E-DCH maximum data rate is a value calculated in consideration of the DCH maximum data rate of each UE. . The method of claim 26, wherein the scheduling signal generator, The apparatus for calculating the E-DCH maximum rate information of each terminal in consideration of the DCH maximum rate of each terminal. 29. The apparatus of claim 28, wherein the optimization coefficient for each terminal is calculated as a ratio of the maximum DCH transmission rate (or transmission power) to the average DCH transmission rate (or transmission power) of each terminal. The method according to any one of claims 27 to 29, The maximum DCH transmission rate of each terminal is calculated by multiplying the optimization coefficient for each terminal and RoT corresponding to the maximum transmission rate (or transmission power) of each terminal in consideration of the DCH transmission rate (or transmission power) predicted to be transmitted by the terminal. Said device. In a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH), If there is an uplink dedicated channel (hereinafter referred to as DCH) at the time of initial transmission of the E-DCH and the DCH no longer exists at the time of retransmission of the E-DCH, the transmission power used for E-DCH transmission at the time of the initial transmission is determined. Resetting the transmission power to be used for retransmission of the E-DCH to a value of the transmission power used to transmit the DCH at the initial transmission time; And transmitting an E-DCH by applying the reset transmission power. 35. The method of claim 34, wherein resetting the transmission power to be used for the E-DCH retransmission, If the number of retransmissions of the E-DCH is one or more times, the method further comprises a step of transmitting an E-DCH by applying the reset transmission power, wherein the retransmission power is applied every additional retransmission occurs. The method of claim 34, The transmission power used to transmit the DCH added for the E-DCH retransmission is variable, it is applied within the E-DCH transmission power range. In a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH), If only the E-DCH exists at the time of initial transmission of the E-DCH and the DCH is added at the time of the E-DCH retransmission, to transmit the DCH at the retransmission time at the transmission power used for the E-DCH transmission at the initial transmission time. Resetting the rosin power to be used for the E-DCH retransmission by subtracting the used transmit power; Transmitting the E-DCH by applying the transmission power. 38. The method of claim 37, wherein resetting the transmit power to be used for the E-DCH retransmission, If the number of retransmissions of the E-DCH is one or more times, the method further comprises a step of transmitting an E-DCH by applying the reset transmission power, wherein the retransmission power is applied every additional retransmission occurs. The method of claim 37, wherein The transmission power used to transmit the DCH added for the E-DCH retransmission is variable, it is applied within the E-DCH transmission power range. The method of claim 37, wherein the DCH transmission power, And a value set according to a DCH transmission rate determined in consideration of radio resource information commonly allocated to the E-DCH and the DCH. In a method for transmitting an uplink dedicated transport channel in a mobile communication system using an enhanced uplink dedicated transport channel (hereinafter, E-DCH), The retransmission transmit power of the E-DCH is added to the initial transmit transmit power of the E-DCH by the extra power due to the channel no longer transmitted at the time of the E-DCH retransmission, and the transmission power of the channel added at the retransmission time is subtracted. Setting up process, And transmitting the E-DCH by applying the transmission power. 42. The method of claim 41 wherein If the channel that does not occur at the time of retransmission is DCH, And resetting the rosin power of the E-DCH to be retransmitted by adding the DCH transmit power used at the initial transmission time to the E-DCH transmit power of the terminal used at the initial transmission time. 42. The method of claim 41, wherein the first additional channel generated at the retransmission time point is a DCH, the E-DCH transmission power of the UE used at the initial transmission time point is subtracted from the DCH transmission power. Resetting the rosin power. 42. The method of claim 41, wherein resetting the transmit power to be used for the E-DCH retransmission, If the number of retransmissions of the E-DCH is one or more times, the method further comprises a step of transmitting an E-DCH by applying the reset transmission power, wherein the retransmission power is applied every additional retransmission occurs. 42. The method of claim 41 wherein The transmission power used to transmit the DCH added for the E-DCH retransmission is variable, it is applied within the E-DCH transmission power range.