CN1969482A - Method and apparatus for data transmission/scheduling for uplink packet data service in a mobile communication system - Google Patents

Abstract

Provided are a method and an apparatus for scheduling uplink data transmission in a mobile communication system. The method and device include a base station scheduler for efficiently allocating wireless communication resources in a mobile communication system using E-DCH or DCH. The method and apparatus also include a user equipment (UE) for efficiently selecting the data rate of the E-DCH and the data rate of the legacy DCH using the E-DCH and the legacy DCH. The method and device can keep the total transmit power of the UE the same as the total transmit power of the UE in the initial transmission during retransmission, regardless of the presence or absence of the DCH, thereby minimizing the change in the amount of interference generated by the UE in the uplink .

Description

Method and apparatus for data transmission/scheduling of uplink packet data service in mobile communication system

technical field

The present invention relates to cellular code division multiple access (CDMA) communication systems. In particular, the present invention relates to a method and apparatus for efficient data transmission/scheduling of an Enhanced Uplink Dedicated Transport Channel.

Background technique

The Universal Mobile Telecommunications Service (UMTS) system is a third generation (3G) mobile communication system based on the General Packet Radio Service (GPRS) and the European System for Mobile Communications - Global System for Mobile Communications (GSM), using Wideband Code Division Multiple Access (WCDMA )plan. The UMTS system provides stable services and can transmit packet-based text, digitized voice or video and multimedia data at a high speed of at least 2Mbps.

In UMTS systems, the Enhanced Uplink Dedicated Channel (EUDCH or E-DCH) is used to enhance the performance of packet transmission in uplink (UL) communication, that is, from user equipment (UE) to base station (BS) Or Node B (hereinafter referred to simply as "Node B") reverse or reverse communication. In order to realize data transmission with more stable speed, E-DCH supports various technologies such as adaptive modulation and coding (AMC) scheme, hybrid automatic repeat request (HARQ) scheme and base station control scheduling.

The AMC scheme is a technique for enhancing radio resource efficiency, and it is realized by determining a modulation scheme and a coding scheme of a data channel according to a channel state between a Node B and a UE. A modulation and coding scheme (MCS) is a combination of a modulation scheme and a coding scheme, and provides various MCS levels that can be defined according to supportable modulation schemes and coding schemes. That is to say, the AMC adaptively determines the MCS level according to the channel state between the Node B and the UE, thereby enhancing the efficiency of the radio frequency.

The HARQ scheme is a technique of retransmitting a packet to compensate for a packet error when a previously transmitted data packet has an error. The HARQ scheme can be divided into a Chase Combining (CC) scheme and an Incremental Redundancy (IR) scheme. According to the CC scheme, when a previously transmitted data packet has an error, a packet having the same format as the previously transmitted packet is retransmitted. According to the IR scheme, when a previously transmitted data packet has an error, a packet having a different format from the previously transmitted packet is retransmitted.

According to the base station control scheduling, Node B determines whether to transmit uplink data and the possible data rate upper limit when using E-DCH to transmit data, and UE determines the uplink E by referring to the determined scheduling information sent from Node B to UE. - the data rate of the DCH, and data is transmitted at the determined data rate.

FIG. 1 shows uplink packet transmission through E-DCH in a conventional wireless communication system.

In FIG. 1, reference numeral 100 refers to a Node B supporting E-DCH, and reference numerals 101, 102, 103, and 104 refer to UEs using E-DCH. As shown, UEs 101 to 104 transmit data to Node B 100 over E-DCHs 111, 112, 113 and 114.

Node B 100 adjusts the E-DCH data rate by utilizing the data buffer status, requested data rate or channel state information of UEs 101 to 104 using E-DCH when performing a scheduling operation, or reports to each UE whether it is possible Send E-DCH data. In the scheduling as described above, in order to enhance the performance of the whole system, while preventing the measured noise rise (noise rise) or thermal noise rise (Rise-over-Thermal, RoT) value from exceeding the target value, for off-node UEs far from the Node B (e.g., UEs 103 and 104) are assigned lower data rates, while UEs closer to the Node B (e.g., UEs 101 and 102) are assigned higher data rates.

FIG. 2 is a message flow diagram of a conventional signal transmission/reception process via E-DCH.

In step 202, Node B and UE establish E-DCH. The setup step 202 includes message transmission over a dedicated transmission channel. After the E-DCH is established, the UE reports scheduling information to the Node B in step 204 . The scheduling information may be uplink channel information including UE transmit power information, information on remaining power that the UE can transmit, the amount of data to be transmitted accumulated in the UE's buffer area, and the like.

After receiving the scheduling information from the plurality of UEs communicating with it, in step 206 the Node B monitors the scheduling information from the plurality of UEs in order to schedule data transmission for each UE. Specifically, the Node B approves the UE's uplink packet transmission, and sends scheduling assignment information to the UE in step 208 . The scheduling allocation information includes information about allowed data rates, allowed timing for transmissions, and the like.

The UE determines the transport format (TF) of the uplink E-DCH to be transmitted by using the scheduling assignment information in step 210, transmits the uplink packet data through the E-DCH in step 212, and in step 214 TF information is sent to Node B through the E-DCH. The TF information includes a Transport Format Resource Indicator (TFRI), indicating information required to demodulate the E-DCH. When transmitting the TF information in step 214, the UE selects an MCS level based on the data rate and channel state allocated to the UE by the Node B, and transmits uplink packet data based on the selected MCS level.

In step 216, the Node B determines whether the TF information or the packet data has errors. In step 218, through the ACK/NACK channel, when any one of the TF information and the packet data has an error, the Node B sends a negative acknowledgment (NACK) message, and when neither the TF information nor the packet data has an error, sends a positive acknowledgment ( ACK) information. When sending ACK information indicating successful packet data transmission, the UE sends new E-DCH data through the E-DCH. When the NACK information is transmitted, the UE transmits E-DCH data having the same content through the E-DCH.

In the conventional procedure as described above, the Node B measures and estimates the total RoT used in the cell, and allocates an unused extra RoT for the E-DCH within the range of the maximum RoT allowed in the cell. Here, RoT denotes uplink resources used by the Node B.

In order to improve the performance of the system, it is necessary to optimize the extra RoT (such as resources) that can be allocated for E-DCH. For this optimization, a method of reasonably measuring and estimating the total RoT currently being used is needed. According to conventional methods, the total RoT currently being used may be measured and estimated too high, which may unduly reduce allocatable resources and may degrade the overall system performance. Furthermore, no method has been disclosed for efficiently allocating resources between D-DCH and DCH that exist simultaneously as uplink channels. Therefore, it is difficult for the existing DCH to provide satisfactory service quality.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a method and a device by which the base station scheduler can use the enhanced uplink dedicated transmission channel Efficiently allocate radio resources in mobile communication systems.

Another object of the present invention is to provide a method and apparatus, by which a user equipment (UE) using an enhanced uplink dedicated transport channel and a conventional dedicated transport channel can efficiently select an enhanced uplink dedicated transport channel data rate and that of a typical dedicated transport channel.

Another object of the present invention is to provide a method and apparatus by which the data rate of a user equipment (UE) using an enhanced uplink dedicated transport channel and a conventional dedicated transport channel can be determined without being limited by the dedicated transport channel limit.

Another object of the present invention is to provide a method and apparatus, which can keep the total transmit power of the UE the same as the total transmit power of the UE during the initial transmission, regardless of the presence or absence of the DCH, so that the UE can The variation in the amount of interference generated in the uplink is minimal.

In order to achieve the above object, a method of scheduling uplink data transmission in a mobile communication system supporting uplink packet data service through a first channel and a second channel is provided. The method comprises the steps of: determining an average data rate for a first channel; determining a maximum data rate for a second channel based on the difference between the total radio resources and the radio resources corresponding to the determined average data rate for the first channel; A user equipment (UE) transmits scheduling assignment information indicating the determined maximum data rate, wherein the second channel is scheduled and the first channel is not scheduled.

According to another aspect of the present invention, an apparatus for scheduling uplink data transmission in a mobile communication system supporting an uplink packet data service through a first channel and a second channel is provided. The apparatus includes: a scheduling signal generator configured to determine an average data rate expected for a first channel, and determine a second channel based on a difference between total radio resources and radio resources corresponding to the determined average data rate of the first channel. The maximum data rate of two channels, and generate a scheduling signal indicating the determined maximum data rate; a scheduling signal transmitter, for sending the generated scheduling signal to a user equipment (UE); and a scheduling signal transmission controller, for controlling The scheduling signal generator and the scheduling signal transmitter make it possible to transmit the scheduling signal at a predetermined scheduling cycle, wherein the second channel is scheduled and the first channel is not scheduled.

According to another aspect of the present invention, there is provided a method of transmitting uplink data in a mobile communication system supporting an uplink packet data service. The method includes the steps of: receiving scheduling allocation information indicating the maximum data rate of the first channel and the second channel; determining the data rate of the first channel based on the maximum data rate; based on the maximum data rate of the first channel and the data rate. determining a data rate of the second channel; and transmitting uplink data of the first channel and the second channel using the determined data rate, wherein the second channel is scheduled and the first channel is not scheduled.

According to another aspect of the present invention, an apparatus for transmitting uplink data in a mobile communication system supporting an uplink packet data service is provided. The device includes: a scheduling allocation information receiver, configured to receive scheduling allocation information indicating the maximum data rates of the first channel and the second channel; a controller, configured to determine the data rate of the first channel based on the maximum data rate, and based on the second channel a difference between the maximum data rate of one channel and the available data rate, determining a data rate of a second channel; and a transmitter for transmitting uplink data of the first channel and the second channel using the determined data rate, wherein , the second channel is scheduled, but the first channel is not scheduled.

Description of drawings

Through the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and advantages of the present invention will be more clear, wherein:

FIG. 1 shows uplink packet transmission through an enhanced uplink dedicated channel (E-DCH) in a conventional wireless communication system;

FIG. 2 shows a message flow diagram of a conventional signal transmission/reception process through the E-DCH;

FIG. 3 shows a flowchart of a process in which a Node B generates a scheduling command for each user equipment (UE) according to an embodiment of the present invention;

FIG. 4 shows a flowchart of a process in which a UE determines a data rate according to an embodiment of the present invention;

FIG. 5 shows a flowchart of a process in which a UE determines transmission power according to an embodiment of the present invention;

FIG. 6 shows a block diagram showing the structure of an apparatus for sending scheduling allocation information of a Node B according to an embodiment of the present invention; and

Fig. 7 shows a block diagram of an apparatus for determining a data rate of a UE and controlling transmit power of the UE according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, when a detailed description of well-known functions and configurations incorporated herein may make the subject matter of the present invention unclear, the detailed description will be omitted. In addition, various specific terms appearing in the following description are defined in consideration of the functions of the present invention, and may be changed according to user's and operator's or customer's wishes. Therefore, the definitions of these terms must be based on the contents of the entire specification of the present invention.

The core of the present invention lies in the improvement of the uplink packet data service of the mobile communication system. For convenience of description, an uplink dedicated channel (DCH) and an enhanced uplink dedicated channel (E-DCH) are discussed. The transmit power and data rate used here generally have a one-to-one relationship. Therefore, both of them will be used in the following description.

First, in order to prevent inefficient use of resources by the Node B as described above, a method of reasonably measuring and estimating the sum of resources used in a cell is required. That is, the amount of resources that a Node B can utilize (as the RoT of a user equipment (UE) that will use the E-DCH in the cell) corresponds to the difference between the maximum allowable RoT in the cell and the total RoT used in the cell. The Node B is informed by the Radio Network Controller (RNC) about the maximum RoT allowable in the cell.

The total RoT used in the cell includes RoT of DCH and RoT of other channels. In case of DCH, the UE selects a Transport Format Combination (TFC) corresponding to the data rate (or transmission power) of the DCH from a Transport Format Combination Set (TFCS) signaled by the Node B. Therefore, the Node B cannot know in advance the exact data rate (or transmit power) of each UE at a specific point in time. Therefore, it is difficult to perform accurate estimation of the RoT of the DCH. The only thing Node B can know from the maximum allowed data rate (or transmit power) for each UE is the RoT corresponding to this data rate (or transmit power).

If the Node B calculates the used RoT in the cell in consideration of the maximum data rate (or transmission power) allowed for each UE, the RoT resource that can be allocated to the E-DCH decreases. This is because the DCH transmitted by each UE is not always transmitted at the maximum data rate (or transmit power) in the TFCS signaled from the Node B. Therefore, the embodiments of the present invention provide a method of utilizing the statistical characteristics of the DCH data rate (or transmit power) of each UE in order to reasonably estimate the used DCH RoT in the cell.

The RNC can know the statistical characteristics of the data rate (or transmission power) of each UE by pre-testing or by observing the data rate (or transmission power) of each UE in the cell within a predetermined period of time. The RNC can estimate the average data rate by exploiting statistical properties, and can reasonably predict the DCH RoT based on the average data. In order to efficiently utilize uplink RoT resources, the scheduling optimization coefficient α _i (0≤α _i ≤1, where α _i represents the scheduling optimization coefficient corresponding to the i-th UE) of each UE is defined as the average data rate and each The ratio of the maximum allowed data rate of the UE, and the RNC can reasonably predict the DCH RoT based on the scheduling optimization coefficient α _i . The RNC sends the calculated scheduling optimization coefficients or the estimated average data rate corresponding to the calculated scheduling optimization coefficients to the Node B, so that the Node B can use them to predict the DCH RoT. In the example described above, the prediction of the DCH RoT is performed by the RNC. However, at the option of the system designer, the Node B can also predict the DCH RoT.

A method for estimating scheduling optimization coefficients according to an embodiment of the present invention will be described below.

The scheduling optimization coefficient is the ratio of the DCH average data rate (or transmission power) to the DCH maximum data rate (or transmission power), which can be expressed by the following formula (1):

$\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; DCHi</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; ]</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; PR</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; DCH</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; DCHi</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; DCHi</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; ]</span>}{\underset{\mathrm{<span\; class="notranslate">\; j</span>}}{\mathrm{<span\; class="notranslate">\; max</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; DCHi</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In formula (1), i is an index indicating each UE, j is an index indicating each TFC, E[ _{RDCHi, j} ] represents the DCH average data rate (or transmit power) of the i-th UE, Pr( DCH _i,j ) represents the DCH occurrence probability of the i-th UE with the j-th TFC, R _DCHi,j represents the DCH data rate (or transmit power) of the i-th UE with the j-th TFC, and Indicates the allowed maximum data rate (or transmit power) of the i-th UE with the j-th TFC.

Fig. 3 is a flowchart of a process in which a Node B generates a scheduling command for each UE according to an embodiment of the present invention.

In step 301, the Node B calculates the RoT corresponding to the expected DCH average data rate (or transmit power) for each UE. The RoT corresponds to a product obtained by multiplying each UE's scheduling optimization coefficient by each UE's DCH maximum data rate (or transmit power). By utilizing the scheduling optimization coefficient as described above, it is possible to prevent the waste of the RoT that may be caused by calculating the RoT used in the cell to be too large. RoTs for other uplink common channels may also be calculated.

In step 302, the Node B uses the difference between the maximum RoT allowed in the cell and the total RoT calculated in step 301 as the maximum RoT that can be allocated to the E-DCH in the cell. The total RoT calculated in step 301 represents the total RoT for DCH and E-DCH, and may include the total RoT for common channels. In general, the RoTs allocated to control channels related to data channels and common channels are fixed in advance or determined based on the RoTs allocated to corresponding data channels. Therefore in this description only the radio resources allocated to the uplink data channel will be discussed. The maximum RoT allowed in a cell is a value signaled from the RNC to the Node B.

In step 303, the Node B obtains the E-DCH maximum data rate (or transmission power) of each UE based on the E-DCH scheduling information received from each UE, which does not exceed the total RoT.

In step 304, the Node B generates scheduling allocation information for each UE, which includes the E-DCH maximum data rate for each UE calculated in step 303. The scheduling allocation information indicates the maximum data rate of E-DCH and DCH. For example, scheduling assignment information may be represented as one of the following types of information.

Information No. 1 indicates 'maximum transmittable total data rate per UE including DCH and E-DCH'. That is, the UE determines the DCH data rate and the E-DCH data rate within the total data rate.

Information No. 2 indicates 'maximum E-DCH data rate per UE' and 'scheduling optimization coefficient per UE' in step 303 of FIG. 3 . Each UE can obtain the same information as Information No.1 by calculating the sum of the product of the E-DCH maximum data rate and the scheduling optimization coefficient multiplied by the DCH maximum data rate. The DCH maximum data rate is a value notified to the UE by signaling from the RNC.

Information No. 3 indicates the 'average DCH data rate expected to be transmitted per UE' and 'E-DCH maximum data rate per UE' in step 301 of FIG. 3 (as calculated in step 303). Each UE can obtain the same information as Information No. 1 from these two values.

Information No. 4 indicates 'the sum of DCH maximum data rate and E-DCH maximum data rate per UE'. The E-DCH maximum data rate is a value calculated considering the DCH maximum data rate per UE, not the DCH average data rate.

Information No. 5 indicates 'E-DCH maximum data rate'. The E-DCH maximum data rate is a value calculated considering the DCH maximum data rate per UE, not the DCH average data rate. The UE generates information No. 4 by using information No. 5 and the TFCS signaled from the Node B.

Each UE can know the 'maximum transmittable data rate per UE including DCH and E-DCH'. If each transmission channel is assigned a maximum transmittable data rate, other channels cannot use the remaining data rate after each transmission channel uses the data rate, and efficient use of resources cannot be achieved. However, if each UE has knowledge of the 'maximum transmittable data rate per UE including DCH and E-DCH', it can flexibly determine the DCH and E-DCH data rates within the maximum transmittable data rate, So as to realize the efficient utilization of resources. In addition, according to information No.4 or No.5, the UE can flexibly determine the data rate of DCH and E-DCH within the maximum transmittable data rate, so as to realize efficient utilization of resources.

FIG. 4 is a flowchart of a process in which a UE determines a data rate according to an embodiment of the present invention.

In step 400, the UE receives the scheduling allocation information (or the total transmit power that can be transmitted), or receives the scheduling allocation information and calculates the total transmit power that can be transmitted based on the scheduling allocation information received from the Node B. The total transmit power includes the amount of DCH data in the UE buffer area, the currently available transmit power, the currently available TFCS and the capability of the UE.

In step 401, the UE determines the data rate of the DCH. Generally speaking, DCH has the same high priority as voice data. Therefore, the data rate of the DCH is determined regardless of the presence or absence of the E-DCH. That is, the data rate (or transmission power) of the DCH is determined in consideration of the total transmission power that the UE can transmit within the TFCS signaled from the Node B.

In step 402, the UE compares the total transmit power (including the allocated DCH and E-DCH, the UE's maximum transmittable data rate) with the UE's transmit power limit value. The transmit power limit value of the UE is the upper limit of transmit power allowed by the power amplifier, and it is physically impossible to transmit at a power higher than the transmit power limit value. As a result of the comparison, when the total transmit power is less than the transmit power limit value of the UE, the UE proceeds to step 403 .

In step 403 , the UE compares the total transmit power with the transmit power corresponding to the DCH data rate determined in step 401 . When the total transmit power is greater than the transmit power corresponding to the DCH data rate determined in step 401, in step 404, the UE determines the difference between the total transmit power and the transmit power corresponding to the DCH data rate as the E-DCH maximum data rate rate, and proceed to step 409. In step 409, the UE determines the E-DCH data rate within the E-DCH maximum data rate.

As a result of the determination in step 403 , when the total transmission power is less than or equal to the transmission power corresponding to the DCH data rate determined in step 401 , the UE proceeds to step 405 . In step 405, the UE determines the E-DCH maximum data rate as 0 considering the fact that there is no available transmit power left. Then, in step 409, the UE does not send data through the E-DCH.

As a result of the determination in step 402, when the total transmit power (including the allocated DCH and E-DCH, the UE's maximum transmittable data rate) is greater than or equal to the UE's transmit power limit value, the UE proceeds to step 406.

In step 406 , the UE compares the transmit power limit value of the UE with the transmit power corresponding to the DCH data rate determined in step 401 . When the transmit power limit value of the UE is greater than the transmit power corresponding to the DCH data rate determined in step 401 , the UE proceeds to step 407 . When the transmit power limit value of the UE is less than or equal to the transmit power corresponding to the DCH data rate determined in step 401 , the UE proceeds to step 408 .

In step 407, the UE determines the difference between the transmit power limit value and the transmit power corresponding to the DCH data rate determined by the UE as the E-DCH maximum data rate. Then in step 409, the UE determines the E-DCH data rate within the E-DCH maximum data rate.

It is not possible to determine the DCH data rate to a value exceeding the transmission power limit value. Therefore, it is necessary to adjust the transmission power of the DCH. Therefore, in step 408, the UE sets the DCH data rate to the 'transmit power limit'. Then, the UE proceeds to step 405 . In step 405, the UE determines the E-DCH maximum data rate as 0 considering the fact that there is no available transmit power left. Then, in step 409, the UE does not send data through the E-DCH.

In case data is transmitted at the data rates of DCH and E-DCH determined through the above-described process, it may be necessary to retransmit E-DCH through HARQ operation. In this case, when there is only E-DCH but no DCH at the time of retransmission, the power that would have been occupied by DCH when DCH was present can be added to the power allocated to E-DCH, so that the total transmission generated by UE The power level can be kept constant, and the base station scheduler can work stably. That is, the transmission power Tx_power_E-DCH set for the E-DCH during retransmission can be expressed as the transmission power Tx_power_E-DCH_init used for the E-DCH in the initial transmission and the transmission power Tx_power_E-DCH_init used in the initial transmission. The sum of the transmit power Tx_power_DCH_init used by DCH:

Tx_power_E-DCH=Tx_power_E-DCH_init+Tx_power_DCH_init

……(2)

Also, when only the E-DCH is transmitted in the initial transmission, and the DCH is generated when the E-DCH is retransmitted by HARQ, the transmission power of the generated DCH is set to have a value corresponding to the DCH data rate, and will be transmitted by The value obtained by subtracting the DCH transmission power from the transmission power allocated for the E-DCH at the time of initial transmission is set as the E-DCH transmission power at the time of retransmission. Therefore, the total transmission power level of the UE at the time of retransmission can be kept the same as that of the UE at the time of initial transmission, and the base station scheduler can work stably. That is, the transmit power Tx_power_E-DCH set for the E-DCH during retransmission can be expressed as the transmit power Tx_power_E-DCH_init used for the E-DCH in the initial transmission and the transmission power Tx_power_E-DCH_init allocated to the The difference between the transmitted power Tx_power_DCH of the DCH that appears, as shown in the following formula (3):

Tx_power_E-DCH=Tx_power_E-DCH_init-Tx_power_DCH

... (3)

From formula (2) and formula (3), the transmission power Tx_power_E-DCH set for E-DCH during retransmission can be summarized as the following formula (4):

Tx_power_E-DCH=Tx_power_E-DCH_init+Δ_release-Δ_add

...(4)

In other words, the transmit power Tx_power_E-DCH set for E-DCH at the time of retransmission corresponds to Value obtained by subtracting transmit power (Δ_add). Here, extra power (Δ_release) refers to power due to lack of DCH at retransmission, and transmit power (Δ_add) refers to transmit power of an added channel that does not exist at initial transmission but appears at retransmission.

The above description discusses the method of setting the E-DCH transmission power considering the initial transmission and retransmission of the E-DCH. However, when retransmission of E-DCH is performed more than once, E-DCH transmission power may be determined every time additional retransmission is performed. For example, in the case of performing a maximum of four retransmissions, when DCH exists in the first and second retransmissions but not in the third retransmission, or when there is no DCH in the first retransmission but When there is a DCH in the second retransmission, formula (4) can be used to set the transmission power of the E-DCH retransmission.

In the above embodiments, the DCH transmit power is reflected in the transmit power for establishing E-DCH retransmission. However, according to another embodiment, an adaptive application may be employed within the range of DCH transmit power taking into account the E-DCH data rate. For example, when there is a need to increase the transmit power for E-DCH retransmission, i.e., when there is no DCH in E-DCH retransmission and E-DCH has a high data rate, all transmit power for DCH is applied to establish E-DCH - Transmit power of DCH. On the contrary, when the E-DCH has a low data rate, part of the transmission power used for the DCH may be applied to establish the transmission power of the E-DCH, or the E-DCH may be transmitted while maintaining the previous DCH transmission power.

After the UE determines the data rates of the DCH and the E-DCH, the corresponding instantaneous transmit power of the UE can be increased. For example, when the channel state drops, the transmit power of the UE can be increased instantaneously through the power control operation. Therefore, a procedure in which the UE determines the transmission power of the DCH and the E-DCH in consideration of the instantaneous transmission power and the transmission power limit value according to another embodiment of the present invention will be described below.

Fig. 5 shows a flowchart of a process of determining transmission power by a UE according to an embodiment of the present invention.

In step 501, the UE determines whether the 'total instantaneous transmit power corresponding to the DCH and E-DCH data rates' exceeds the 'transmit power limit value' of the UE, which is the upper limit of transmit power allowed by the power amplifier of the UE.

As a result of the determination, when the 'sum of instantaneous transmission power corresponding to the DCH and E-DCH data rates' does not exceed the 'transmission power limit value' of the UE, the UE proceeds to step 507 in which the UE does not adjust the transmission power.

As a result of the determination, when the sum exceeds the transmission power limit value, the UE maintains the transmission power of the DCH by giving priority to the DCH in step 502 and readjusts the transmission power of the E-DCH in step 503 . As a result, DCH-related operations are minimally affected by E-DCH. Specifically, the transmit power of the E-DCH is readjusted by reducing the transmit power of the E-DCH by the difference between 'the sum of instantaneous transmit power corresponding to the DCH and E-DCH data rate' and the 'transmit power limit value' . That is, the UE reduces the transmission power of the E-DCH by the part where the total transmission power of the DCH and the E-DCH exceeds the transmission power limit value.

In step 504, the UE determines whether the adjusted E-DCH transmission power has a positive value. When the adjusted E-DCH transmission power has a positive value, the UE 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.

As a result of the determination in step 504, when the adjusted E-DCH transmission power does not have a positive value, the UE proceeds to step 506. Since the transmission value cannot have a negative value, the UE does not transmit the E-DCH in step 506 .

Fig. 6 is a block diagram of the structure of an apparatus for sending scheduling allocation information of a Node B according to an embodiment of the present invention.

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

The scheduling signal sending controller 601 controls the scheduling signal generator 602 and the scheduling signal transmitter 603, so that the scheduling signal can be sent in a predetermined scheduling period.

The scheduling signal generator 602 generates a scheduling signal in consideration of the RoT corresponding to the DCH average data rate each UE is expected to transmit, the maximum RoT allowed in the cell, and E-DCH scheduling information of each UE. Here, the RoT corresponding to the DCH average data rate that each UE is expected to transmit may be signaled from the RNC to the Node B. Otherwise, the Node B may calculate the maximum data rate of DCH allowed for each UE from the RNC signaling to the Node B, and the scheduling optimization coefficient of each UE notified from the RNC signaling to the Node B, to calculate the relationship with each UE. RoT corresponding to the average data rate of the DCH expected to be sent by a UE. The maximum RoT allowed in a cell is a value signaled from the RNC to the Node B. In addition, the Node B can calculate the RoT corresponding to the average DCH data rate and the scheduling optimization coefficient for each UE. The operation of generating a scheduling command for each UE is performed by the scheduling signal generator 602 . The scheduling signal transmitter 603 codes and modulates the generated scheduling signal, and then sends the coded and modulated signal through the scheduling channel.

Fig. 7 is a block diagram of an apparatus for determining a data rate of a UE and controlling transmit power of the UE according to an embodiment of the present invention.

Referring to FIG. 7 , the UE receives scheduling allocation information from a Node B, and demodulates/decodes the received scheduling allocation information in a scheduling allocation information demodulation/decoding unit 702 , thereby obtaining scheduling allocation information. Here, the scheduling assignment information includes at least one of information No. 1, information No. 2, information No. 3, information No. 4, and information No. 5 as described above.

The UE determines the 'maximum transmittable data rate (or transmit power) of the UE including DCH and U-DCH' according to the scheduling allocation information. Since the data rate of the DCH is determined regardless of the presence or absence of the E-DCH, the DCH data rate determiner 706 considers the maximum transmittable data rate (or transmit power) of the UE including the DCH and U-DCH ', the amount of data in the buffer area of the UE, the currently available TFCS, the capabilities of the UE, etc., to determine the DCH data rate. The DCH data rate determiner 706 receives information about the amount of DCH data in the UE's buffer from the DCH data buffer 705 and uses it in order to determine the DCH data rate.

When the DCH data rate is determined, the DCH transmission controller 707 determines the DCH transmission format and applies it to the DCH data transmitter 708 . Information on the DCH transport format is sent to the UE through a Dedicated Physical Control Channel (DPCCH) for carrying DCH control information. The DCH data transmitter 708 takes out a specified amount of data from the DCH data buffer area 705 according to the DCH transmission format, performs channel coding and modulation on the taken out data, and then transmits the channel-coded and modulated data through the physical channel-dedicated physical data channel (DPDCH). The data.

Based on 'the maximum transmittable data rate (or transmit power) of the UE including DCH and U-DCH', the DCH data rate (or transmit power) determined in the DCH data rate determiner 706 and the E-DCH data buffer area 701 The amount of data in to determine the data rate of E-DCH. Specifically, the determination of the E-DCH data rate is performed according to the procedure described with reference to FIG. 4 .

When the E-DCH data rate is determined, the E-DCH transmission controller 704 determines the E-DCH transmission format and applies it to the E-DCH data transmitter 709 . Information on the E-DCH transport format is transmitted through an Enhanced Dedicated Physical Control Channel (E-DPCCH) for carrying E-DCH control information. The E-DCH data transmitter 709 takes out a specified amount of data from the E-DCH data buffer area 701 according to the E-DCH transmission format, performs channel coding and modulation on the taken out data, and then passes through the physical channel of the E-DCH-enhanced dedicated The physical data channel (E-DPDCH) transmits channel coded and modulated data.

At the same time, the UE's instantaneous transmit power may increase to or even exceed the 'transmit power limit' allowed by the UE's power amplifier. In this case, the transmit power controller 710 adjusts the transmit power of each channel, and reflects the adjusted power multiplied by the gain factor to each channel, thereby maintaining the UE's instantaneous transmit power at the 'transmit power limit value' within. Then, while keeping the transmit power of the DCH unchanged, the UE reduces the transmit power of the E-DCH by the part where the total transmit power of the DCH and the E-DCH exceeds the limit value of transmit power. If the UE's instantaneous transmit power exceeds the 'transmit power limit value' even after reducing the transmit power of E-DCH, the UE reduces the transmit power of channels other than E-DCH in the same manner.

The above description only discusses information No.1. However, the use of Information No. 2 to Information No. 5 may also have the same or equivalent effects in achieving the object of the present invention.

According to the embodiments of the present invention described above, in the case of using E-DCH, the base station scheduler can efficiently allocate wireless communication resources, and the UE can efficiently select the data rates of E-DCH and DCH. In addition, according to this embodiment of the present invention, the total transmit power of the UE at the time of retransmission can be kept the same as the total transmit power of the UE at the time of the initial transmission, regardless of the presence or absence of the DCH, so that the UE can generate The change in the amount of interference is minimal.

In addition, in the case of using E-DCH and DCH simultaneously, when a momentary power shortage occurs, the power of E-DCH can be readjusted while maintaining the power of DCH.

While the present invention has been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope defined in the claims.

Claims (50)

1. the method for a scheduling uplink transfer of data in mobile communication system, this mobile communication system is by first channel and second channel support uplink packet data service, and the method comprising the steps of:

Determine the average data rate of first channel;

Based on total Radio Resource and poor corresponding between the Radio Resource of the average data rate of determined first channel, determine the maximum data rate of second channel; And

Send the scheduling assignment information of indicating determined maximum data rate to subscriber equipment (UE),

Wherein, second channel is dispatched, and first channel is not dispatched.

2. the method for claim 1, wherein the step of the maximum data rate of described definite second channel comprises step:

Difference between described each Radio Resource is set to distribute to the Radio Resource of second channel; And

Above when can distribute to the maximum wireless resource of second channel in the sub-district, determine the maximum data rate of the second channel of UE at the Radio Resource that prevents to distribute to second channel.

3. the method for claim 1, wherein provide and control total Radio Resource by radio network controller.

4. the method for claim 1, wherein the maximum data rate of each UE by will distributing to first channel multiply by corresponding optimizing scheduling coefficient, calculates the average data rate of first channel.

5. method as claimed in claim 4 wherein, is provided the maximum data rate and the optimizing scheduling coefficient of first channel by radio network controller.

6. method as claimed in claim 5, wherein, the optimizing scheduling coefficient is corresponding to the average data rate of first channel and the ratio of the maximum data rate of first channel.

7. the method for claim 1, wherein each Radio Resource is used corresponding to the rise-over-thermal (RoT) of uplink data rate or transmitting power and is represented.

8. the method for claim 1, wherein dispatching assignment information comprises: comprise the data transfer rate that maximum maximum data rate, UE of the data transfer rate of first channel and second channel can send.

9. the method for claim 1, wherein dispatch maximum data rate that assignment information comprises second channel and the optimizing scheduling coefficient of UE.

10. the method for claim 1, wherein dispatch assignment information and comprise the average data rate of first channel and the maximum data rate of second channel.

11. the method for claim 1, wherein dispatch the summation of the maximum data rate of maximum data rate that assignment information comprises first channel and second channel.

12. the method for claim 1, wherein dispatch the maximum data rate that assignment information comprises second channel.

13. the device of a scheduling uplink transfer of data in mobile communication system, this mobile communication system is by first channel and second channel support uplink packet data service, and this device comprises:

The scheduling signals maker, be used for determining that expection is used for the average data rate of first channel, based on total Radio Resource and poor corresponding between the Radio Resource of the average data rate of determined first channel, determine the maximum data rate of second channel, and generate the scheduling signals of the determined maximum data rate of indication;

The scheduling signals transmitter is used for sending the scheduling signals that is generated to subscriber equipment (UE); With

The scheduling signals transmission control unit (TCU) is used to control scheduling signals maker and scheduling signals transmitter, and making can be sending scheduling signals predetermined dispatching cycle,

Wherein, second channel is dispatched, and first channel is not dispatched.

14. device as claimed in claim 13, wherein, when having determined the maximum data rate of second channel, difference between described each Radio Resource is set to distribute to the Radio Resource of second channel, and above when can distribute to the maximum wireless resource of second channel in the sub-district, determine the maximum data rate of the second channel of UE at the Radio Resource that prevents to distribute to second channel.

15. device as claimed in claim 13 wherein, provides and controls total Radio Resource by radio network controller.

16. device as claimed in claim 13, wherein, the maximum data rate of each UE by will distributing to first channel multiply by corresponding optimizing scheduling coefficient, calculates the average data rate of first channel.

17. device as claimed in claim 16 wherein, is provided the maximum data rate and the optimizing scheduling coefficient of first channel by radio network controller.

18. device as claimed in claim 17, wherein, the optimizing scheduling coefficient is corresponding to the average data rate of first channel and the ratio of the maximum data rate of first channel.

19. device as claimed in claim 13, wherein, each Radio Resource is used corresponding to the rise-over-thermal of uplink data rate or transmitting power (RoT) and is represented.

20. device as claimed in claim 13, wherein, the scheduling assignment information comprises: comprise the data transfer rate that maximum maximum data rate, UE of the data transfer rate of first channel and second channel can send.

21. device as claimed in claim 13, wherein, the scheduling assignment information comprises the maximum data rate of second channel and the optimizing scheduling coefficient of UE.

22. device as claimed in claim 13, wherein, the scheduling assignment information comprises the average data rate of first channel and the maximum data rate of second channel.

23. device as claimed in claim 13, wherein, the scheduling assignment information comprises the summation of the maximum data rate of the maximum data rate of first channel and second channel.

24. device as claimed in claim 13, wherein, the scheduling assignment information comprises the maximum data rate of second channel.

25. a method that sends uplink data in the mobile communication system of support uplink packet data service, the method comprising the steps of:

Receive the scheduling assignment information of the maximum data rate of indication first channel and second channel;

Based on maximum data rate, determine the data transfer rate of first channel;

Poor based between the maximum data rate of first channel and the data transfer rate determined the data transfer rate of second channel; And

Use determined data transfer rate to send the uplink data of first channel and second channel,

Wherein, second channel is dispatched, and first channel is not dispatched.

26. method as claimed in claim 25 also comprises step: reduce transmitting power, surpass the transmit power limit value of UE so that prevent transmitting power corresponding to the data transfer rate of first channel and second channel corresponding to the data transfer rate of second channel.

27. method as claimed in claim 25, wherein, the step of the data transfer rate of described definite second channel comprises step:

When total transmitting power during, determine that total transmitting power is whether greater than first transmitting power corresponding to the data transfer rate of first channel less than the transmit power limit value;

When total transmitting power during, will be defined as the maximum data rate of second channel corresponding to the data transfer rate of the difference between the total transmitting power and first transmitting power greater than first transmitting power; And

In described maximum data rate, determine the data transfer rate of second channel.

28. method as claimed in claim 27 also comprises step: when total transmitting power is not more than first transmitting power, interrupt transmission by second channel.

29. method as claimed in claim 25, wherein, the step of the data transfer rate of described definite second channel comprises step:

When total transmitting power is not less than the transmit power limit value, determine that total transmitting power is whether greater than first transmitting power corresponding to the data transfer rate of first channel;

When total transmitting power during, will be defined as the maximum data rate of second channel corresponding to the data transfer rate of the difference between the total transmitting power and first transmitting power greater than first transmitting power; And

In described maximum data rate, determine the data transfer rate of second channel.

30. method as claimed in claim 29 also comprises step: when total transmitting power is not more than first transmitting power, interrupt transmission by second channel.

31. method as claimed in claim 25, wherein, scheduling assignment information indication is based on total Radio Resource and maximum data rate corresponding to the definite second channel of the difference between the Radio Resource of the average data rate of first channel, rather than the maximum data rate of first channel and second channel.

32. method as claimed in claim 25 wherein, in the step of described definite aggregate date rate, directly obtains aggregate date rate from the scheduling assignment information.

33. method as claimed in claim 25, wherein, in the step of described definite aggregate date rate, by from the scheduling assignment information, obtaining the maximum data rate of second channel and the optimizing scheduling coefficient of UE, the product addition of then maximum data rate of second channel and optimizing scheduling coefficient be multiply by the maximum data rate of first channel that receives from radio network controller and obtaining totalizes according to rate.

34. method as claimed in claim 33, wherein, the optimizing scheduling coefficient is corresponding to the average data rate of first channel and the ratio of the maximum data rate of first channel.

35. method as claimed in claim 25, wherein, in the step of described definite aggregate date rate, by from the scheduling assignment information, obtaining the average data rate of first channel and the maximum data rate of second channel, with the average data rate addition of the maximum data rate and first channel of second channel, totalize then according to rate.

36. method as claimed in claim 25 wherein, in the step of described definite aggregate date rate, obtains the summation of the maximum data rate of the maximum data rate of first channel and second channel, and this summation is made as aggregate date rate from the scheduling assignment information.

37. method as claimed in claim 25, wherein, in the step of described definite aggregate date rate, by from the scheduling assignment information, obtaining the maximum data rate of second channel, with the maximum data rate of second channel and based on maximum data rate addition, totalize then according to rate from the first definite channel of the transport format combination set (TFCS) of radio network controller reception.

38. a device that sends uplink data in the mobile communication system of support uplink packet data service, this device comprises:

Dispatch the assignment information receiver, be used to receive the scheduling assignment information of the maximum data rate of indicating first channel and second channel;

Controller is used for determining based on maximum data rate the data transfer rate of first channel, and poor based between the maximum data rate of first channel and the available data rate, determines the data transfer rate of second channel; With

Transmitter is used to use determined data transfer rate to send the uplink data of first channel and second channel,

Wherein, second channel is dispatched, and first channel is not dispatched.

39. device as claimed in claim 38, also comprise transmitting power controller, be used to reduce transmitting power, so that prevent to surpass the transmit power limit value of UE corresponding to the transmitting power of the data transfer rate of first channel and second channel corresponding to the data transfer rate of second channel.

40. device as claimed in claim 38, wherein second channel data transfer rate controller is carried out following operation:

When total transmitting power during, determine that total transmitting power is whether greater than first transmitting power corresponding to the data transfer rate of first channel less than the transmit power limit value;

When total transmitting power during, will be defined as the maximum data rate of second channel corresponding to the data transfer rate of the difference between the total transmitting power and first transmitting power greater than first transmitting power; And

In described maximum data rate, determine the data transfer rate of second channel.

41. device as claimed in claim 40, wherein, when total transmitting power was not more than first transmitting power, second channel data transfer rate controller interrupted the transmission by second channel.

42. device as claimed in claim 38, wherein, second channel data transfer rate controller is carried out following operation:

When total transmitting power is not less than the transmit power limit value, determine that total transmitting power is whether greater than first transmitting power corresponding to the data transfer rate of first channel;

When total transmitting power during, will be defined as the maximum data rate of second channel corresponding to the data transfer rate of the difference between the total transmitting power and first transmitting power greater than first transmitting power; And

In described maximum data rate, determine the data transfer rate of second channel.

43. device as claimed in claim 42, wherein, when total transmitting power was not more than first transmitting power, second channel data transfer rate controller interrupted the transmission by second channel.

44. device as claimed in claim 38, wherein, scheduling assignment information indication is based on total Radio Resource and maximum data rate corresponding to the definite second channel of the difference between the Radio Resource of the average data rate of first channel, rather than the maximum data rate of first channel and second channel.

45. device as claimed in claim 38, wherein, scheduling assignment information receiver directly obtains aggregate date rate from the scheduling assignment information.

46. device as claimed in claim 38, wherein, scheduling assignment information receiver is by obtaining the maximum data rate of second channel and the optimizing scheduling coefficient of UE from the scheduling assignment information, the product addition of then maximum data rate of second channel and optimizing scheduling coefficient be multiply by the maximum data rate of first channel that receives from radio network controller and obtaining totalizes according to rate.

47. device as claimed in claim 38, wherein, the optimizing scheduling coefficient is corresponding to the average data rate of first channel and the ratio of the maximum data rate of first channel.

48. device as claimed in claim 38, wherein, scheduling assignment information receiver is by obtaining the average data rate of first channel and the maximum data rate of second channel from the scheduling assignment information, with the average data rate addition of the maximum data rate and first channel of second channel, totalize then according to rate.

49. device as claimed in claim 38, wherein, scheduling assignment information receiver obtains the summation of the maximum data rate of the maximum data rate of first channel and second channel from the scheduling assignment information, and this summation is made as aggregate date rate.

50. device as claimed in claim 38, wherein, scheduling assignment information receiver is by obtaining the maximum data rate of second channel from the scheduling assignment information, with the maximum data rate of second channel and based on maximum data rate addition, totalize then according to rate from the first definite channel of the transport format combination set (TFCS) of radio network controller reception.

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