KR20060044535A - Method and apparatus for transmitting uplink data of minimum set in mobile telecommunication system - Google Patents

Abstract

The present invention relates to a mobile communication system for transmitting packet data through uplink, and more particularly, to a method and apparatus for defining and notifying a target of uplink data that can be autonomously transmitted without scheduling of a base station. The radio network controller (RNC) includes, in the configuration information for setting the E-DCH, minimum set information indicating whether the object to be set can be transmitted regardless of allocated transmission resources or available transmission outputs. send. Here, the minimum set information may include a logical identifier indicating the size of the MAC-e PDU allowed for the target MAC-d flow. If there is corresponding minimum set data according to the minimum set information, the terminal transmits the minimum set data through the uplink even if no transmission resources are allowed or no transmission output is available in the new transmission section. This invention prevents the degradation of the transmission efficiency of the reverse link and minimizes the inefficiency due to unscheduled data transmission.

WCDMA, UPLINK PACKET DATA SERVICE, E-DCH, MAC-e, C / T MUX, MAC-e ENTITY, MINIMUM SET

Description

METHOD AND APPARATUS FOR TRANSMITTING UPLINK DATA OF MINIMUM SET IN MOBILE TELECOMMUNICATION SYSTEM}

1A illustrates a change in a received signal of a base station when base station control scheduling is not used.

1B is a diagram illustrating a change in a received signal of a base station when base station control scheduling is used.

2 is a diagram illustrating a user terminal and a base station for performing uplink packet transmission.

3 is a diagram illustrating information transmitted and received between a user terminal and a base station to perform uplink packet transmission.

4 is a view schematically showing the structure of a user terminal according to the present invention;

5 is a signal flow diagram illustrating an operation in which a network specifies and notifies at least a set of E-DCHs according to a first embodiment of the present invention.

6 is a flowchart illustrating a process of defining a minimum set transmission of an E-DCH by a user terminal according to a second embodiment of the present invention.

7 is a signal flow diagram illustrating an operation of a network defining and transmitting a minimum set of E-DCHs and a size of a MAC-e PDU according to a third embodiment of the present invention.

8 is a block diagram illustrating a structure of a transmitting side of an RNC for specifying and notifying a minimum set of E-DCHs according to a preferred embodiment of the present invention.

9 is a block diagram illustrating a receiving side structure of a user terminal performing minimum set transmission of an E-DCH according to a preferred embodiment of the present invention.

The present invention relates to a mobile communication system for transmitting packet data through uplink, and more particularly, to a method and apparatus for efficiently performing uplink data transmission according to a minimum set without base station scheduling.

Asynchronous Wideband Code Division Multiple Access (WWDMA). In a communication system, an enhanced uplink dedicated channel (hereinafter referred to as "E-DCH" or "E-DCH"). ). The E-DCH has been proposed to improve the performance of packet transmission in uplink communication in an asynchronous code division multiple access communication system.

The mobile communication system supporting the E-DCH maximizes the efficiency of uplink transmission using Node B-controlled scheduling and Hybrid Automatic Retransmission Request (hereinafter referred to as "HARQ"). In the base station scheduling scheme, the Node B receives and reports channel conditions and buffer states of user equipments (UEs), and controls uplink transmission of the UEs based on the received information. The base station allows efficient use of limited uplink transmission resources by allowing large amounts of data transmission to UEs in good channel conditions and minimizing the amount of data transmissions for UEs in poor channel conditions. The HARQ technique increases the transmission success rate compared to the transmission output by executing HARQ between the UE and the base station. Through the HARQ technique, the base station performs soft combining with the retransmitted data block without discarding the data block in which an error occurs during transmission, thereby increasing the probability of success of receiving the data block.

In the uplink, orthogonality is not maintained between signals transmitted by a plurality of user terminals (UEs), thus acting as interference signals. Therefore, as the number of uplink signals received by the base station increases, the amount of interference signals for the uplink signals transmitted by a specific UE also increases. Therefore, as the amount of the interference signal for the uplink signal transmitted by a specific UE increases, the reception performance of the base station is degraded. This limits the amount of uplink signals that the base station can receive while guaranteeing overall reception performance. The radio resource of the base station is represented by Equation 1 below.

RoT = Io / No

Io is the total received broadband power spectral density of the base station, and No represents the thermal noise power spectral density of the base station. Accordingly, the ROT becomes a radio resource that the base station can allocate for the E-DCH packet data service in the uplink.

1A and 1B show a change in uplink radio resources that can be allocated by a base station.

As shown in FIG. 1A and FIG. 1B, the uplink radio resource allocated by the base station may be represented by the sum of inter-cell interference (ICI), voice traffic, and E-DCH packet traffic. FIG. 1A illustrates a change in the total ROT when base station scheduling is not used. Since scheduling is not performed for the E-DCH packet traffic, when a plurality of UEs simultaneously transmit the packet data using a high data rate, the total ROT may be higher than a target ROT. In this case, the reception performance of the uplink signal is degraded.

Figure 1b shows the change in the total ROT when using base station scheduling. When using the base station scheduling, a base station prevents the plurality of UEs from simultaneously transmitting the packet data using a high data rate. That is, the base station scheduling prevents the total ROT from increasing above the target ROT by allowing other UEs to have a lower data rate when they allow a higher data rate for a particular UE.

The higher the data rate of a particular UE, the greater the received power received by the base station from the UE. Therefore, the ROT of the UE occupies a large part of the total ROT. On the other hand, when the data rate of the UE decreases, the reception power received by the base station from the UE decreases. Therefore, the ROT of the UE occupies a small part of the total ROT. The base station performs base station scheduling for the E-DCH packet data in consideration of the relationship between the data rate and radio resources and the data rate requested by the UE.

The base station notifies whether E-DCH data transmission is possible for each UE by using request data rate or channel state information of UEs using the E-DCH or schedules the base station to adjust the E-DCH data rate. Do this. The base station scheduling may be regarded as an operation in which the base station distributes RoT to each terminal based on channel conditions and buffer states of terminals performing E-DCH communication.

2 illustrates a user terminal and a base station for performing uplink packet transmission.

According to FIG. 2, the UEs 210, 212, 214, and 216 are transmitting uplink packet data at different transmit powers of reverse channels according to the distance from the base station 200. The UE 210 farthest from the base station 200 transmits packet data at the transmit power 220 of the highest reverse channel, and the UE 214 closest from the base station 200 has the lowest reverse direction. The packet data is transmitted at the transmit power 224 of the channel. The base station 200 may schedule the data to be inversely proportional to the strength of the transmit power of the reverse channel in order to improve the performance of the mobile communication system while maintaining the total ROT and increasing the ICI for other cells. . Therefore, the base station 200 allocates a small transmission resource to the UE having the highest transmission power of the reverse channel, and allocates many transmission resources to the UE having the lowest transmission power of the reverse channel to efficiently maintain the total ROT. .

3 illustrates an operation in which a UE is allocated a transmission resource for transmitting E-DCH packet data from a base station and transmits the packet data using the allocated transmission resource.

Referring to FIG. 3, in step 310, an E-DCH is configured between the base station 300 and the UE 302. Step 310 includes the transmission and reception of messages on a dedicated transport channel. The UE 302 having configured the E-DCH transmits information on necessary transmission resources and information on uplink channel conditions to the base station 300 in step 312. The information includes uplink transmission power transmitted by the UE 302, transmission power margin of the UE 303, buffer status information of the terminal, and the like.

The base station 300 receiving the information estimates a forward channel situation by comparing the transmission power of the uplink channel with the actual measured reception power. That is, if the difference between the uplink transmit power and the uplink receive power is small, the reverse channel situation is good. If the difference between the transmit power and the receive power is large, the reverse channel situation is poor. When the UE transmits a transmission power margin to estimate an uplink channel situation, the base station 300 estimates the uplink transmission power by subtracting the transmission power margin from the maximum possible transmission power of a UE that is already known. do. The base station 300 uses the estimated channel status of the UE and buffer status information of the UE 302 to determine possible transmission resources for an uplink packet channel of the UE.

The determined transmission resource is notified to the UE 302 in step 314. In this case, the transmission resource may be a transmission rate indication indicating the size of data that can be transmitted, or may be a transmission output that can be used. In step 316, the UE 302 determines the size of packet data to be transmitted to the informed transmission resource, and transmits the determined size data to the base station 300. In this case, one unit of the packet data transmitted through the E-DCH is called a MAC-e PDU (Media Access Control-enhanced Protocol Data Unit).

In a mobile communication system using a reverse dedicated channel configured as described above, the terminal has a minimum set that defines at least one data characteristic that can always be transmitted regardless of allowed transmission resources or available transmission outputs. Need to have. Therefore, there is a need for a technology for more efficiently determining and informing a target to be set to the minimum set in a mobile communication system supporting the E-DCH.

Accordingly, the present invention for solving the above-described problems of the prior art provides a method and apparatus for defining an E-DCH minimum set in a mobile communication system supporting uplink.

The present invention provides a method and apparatus for defining a minimum set in consideration of characteristics of data in defining a minimum set of E-DCH.

The present invention provides a method and apparatus for improving the use efficiency of the reverse link by defining data that can be transmitted in the minimum set in defining the minimum set of the E-DCH.

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 main feature of the present invention to be described later is to set and notify the minimum set of E-DCH indicating the type of data that the UE can autonomously transmit without scheduling of the base station in a mobile communication system supporting the E-DCH. That is, the present invention consists of the operation of the system notifying the terminal of the type of data that can be transmitted to the minimum set and the terminal to determine the data to be transmitted in the next transmission interval in consideration of the minimum set.

Hereinafter, in describing the uplink packet data service, an enhanced uplink dedicated channel (E-DCH) of a universal mobile telecommunication service (UMTS), which is one of third generation mobile communication, will be used. However, the present invention is not limited to the above systems and standards, but rather should be understood as all kinds of communication systems to which the following description is applicable.

The UMTS Terrestrial Radio Access Network (hereinafter referred to as UTRAN) of a UMTS system includes a base station Node B including a plurality of cells and a radio network controller managing radio resources of the base stations and the cells. Network Controller (hereinafter referred to as RNC). A UE is located in one of the cells and communicates with the base stations by the RNCs.

4 illustrates a structure of a terminal supporting an uplink packet data service according to a preferred embodiment of the present invention.

Referring to FIG. 4, the terminal 402 includes radio link control (RLC) layers 405a to 405e (hereinafter referred to as 405) and multiplexed information on data transmitted from the RLC layer 405. The C / T multiplexer 410a and 410b (hereinafter referred to as 410) and a MAC-e / es (Media Access Control for E-DCH / Serving RNC) layer 415 are provided.

The RLC entities of the RLC layer 405 are configured for each logical channel or radio bearer, and store data generated in an upper layer and have a size suitable for transmitting data generated in the upper layer in the radio layer. For reference, the radio bearer is a term for an RLC layer and an upper layer configured to process data of a specific application, and the logical channel is a channel between the RLC layer and the MAC layer. It is composed.

The C / T multiplexer 410 inserts multiplexing information into the data transmitted from the RLC layer 405. The multiplexing information may be an identifier of a logical channel, and a receiver sends data received with reference to the identifier to an appropriate RLC entity. The C / T multiplexer 410 is also referred to as a Media Access Control-data (MAC-d) layer.

The MAC-e layer 415 includes a scheduling / priority handling block 420, a MAC-e PDU composition block 435, and a HARQ entity 440. It is composed.

The scheduling / priority processing block 420 schedules data to be transmitted in the next transmission interval in consideration of the priority of logical channels mapped to the E-DCH. The scheduling / priority processing block 420 includes buffer distribution units 425a and 425b (hereinafter referred to as 425) and transmission buffers 430a, 430b, 430c and 430d (hereinafter referred to as 430). The transmission buffers 430 may be stored according to priority prior to transmitting the data delivered by the RLC layer 405 or may be stored for each MAC-d flow. Priority is given to the logical channel. Each of the transmission buffers 430 stores data of the logical channel having the same transmission rank. Alternatively, each of the transmission buffers 430 may store data of a logical channel included in the same MAC-d flow.

The MAC-d flow classifies logical channels according to a required quality of service (QoS). Logical channels requiring the same quality of service are classified into the same MAC-d flow, and the MAC-e layer 415 may provide a specific quality of service for each MAC-d flow. The quality of service may be adjusted by, for example, the number of HARQ retransmissions or the transmission power.

The role of the transmit buffers 430 is to store data until it is transmitted. However, since RLC buffers exist in the RLC layer 405, the RLC buffers may be used as the transmission buffers 430. Therefore, the transmission buffer in the MAC-e structure can be realized in the following three ways.

1. Configure transmit buffers by priority in MAC-e layer

2. Configure transmission buffers for each MAC-d flow in MAC-e layer

3. RLC buffer is used without a separate transmit buffer in MAC-e layer.

Since any of the three methods does not affect the operation of the present invention, the transmission buffer means one of the three.

The buffer distributor 425 serves to transfer data transferred from the C / T multiplexer 410 to an appropriate transmission buffer. The buffer distribution unit 425 is present only when the transmission buffer is provided in the MAC-e layer 415.

The MAC-e PDU configuration unit 435 receives data from the transmission buffers 430 and plays a role of configuring a MAC-e PDU. The MAC-e PDU is a packet transmitted over a wireless channel, and is composed of a header and a payload, and the payload stores data stored in the transmission buffers 430. Since the data stored in the transmission buffers 430 is transferred from the C / T multiplexer 410 which is a MAC-d layer, it is also called a MAC-d PDU.

The HARQ entity 440 is responsible for controlling HARQ transmission and retransmission.

As described above, the UE stores MAC-d PDUs to be transmitted in a transmission buffer, requests Node B to allocate transmission resources, and when Node B allocates transmission resources to the UE, the MAC corresponds to the allocated transmission resources. -e uses the E-DCH communication scheme to transmit PDUs. However, delay sensitive data or relatively important data may not be desirable to request scheduling as described above, and to be transmitted after receiving the scheduling.

For example, it is preferable to transmit the RRC control message as soon as it occurs. If the Node B waits for the allocation of the transmission resource and transmits it, there is a risk of excessive delay. Such delay-sensitive or critical data transmission in a minimal set is under discussion. Here, transmitting to the minimum set means that the Node B can transmit autonomously without allocated radio resources, that is, scheduling, and can transmit autonomously even if the transmission output is not sufficient.

The minimum set may also be defined as the smallest MAC-e PDU defined in the E-DCH. In other words, regardless of what data is stored in the MAC-e PDU, the smallest MAC-e PDU can be defined to be always available for transmission. As described above, the transmission of the data corresponding to the minimum set is called the minimum set transmission.

Considering that the minimum set is transmitted without the Node B's permission, it is preferable that the transmitted object is minimized. For example, it is not desirable to transmit delay-sensitive data such as the file transfer protocol (FTP) to a minimum set. Only high-value data such as an RRC control message should be transmitted to the minimum set. Therefore, the RNC can set the minimum set target to improve the efficiency of the minimum set transmission.

5 is a diagram illustrating an operation for defining a minimum set transmission of an E-DCH in a network according to a preferred embodiment of the present invention. Here, reference numeral 505 denotes a UE, reference numeral 510 denotes a Node B that can communicate with the terminal 505, and reference numeral 515 denotes the Node B 510 and the terminal 505. Means a radio network controller (RNC) 515 to control the communication of.

Referring to FIG. 5, the RNC 515 may define data that can be transmitted in a minimum set according to the following three methods.

1. Specify a logical channel that can be transmitted with at least three sets.

2. Specify the MAC-d flows that can be sent in the minimum set.

3. Specify a transmit buffer that can be sent in at least three sets.

While configuring the E-DCH, the RNC 515 includes information 525 defining data that can be transmitted in a minimum set in the configuration message 520 related to the E-DCH.

For example, if a logical channel that can be transmitted in the minimum set is specified, the RNC 515 sets a minimum message indicating that the logical channel data can be transmitted in the minimum set in the configuration message for setting the logical channel. set indicator).

As another example, if it specifies a MAC-d flow that can be transmitted in the minimum set, the RNC 515 may indicate that the data of the MAC-d flow may be transmitted in the minimum set in a configuration message that sets the MAC-d flow. Include at least three indicators.

As a last example, if you specify a transmit buffer that can be transmitted in the minimum set, the RNC 515 includes a minimum set indicator in the configuration message for setting the transmit buffer that the data in the transmit buffer can be transmitted in the minimum set. .

First, the RNC 515 selects, as a minimum set, a specific logical channel or a specific MAC-d flow or a specific transmission buffer which is determined to be more important than the data of other logical channels or MAC-d flows or transmission buffers. The RNC 515 then configures the configuration information of the target to be set and whether the target can be transmitted to the minimum set, such as a radio bearer setup message, an E-DCH setup message, or a radio bearer reconfiguration message. Includes the minimum set indicator indicating and transmits. The minimum set indicator may be included in the configuration information.

When the terminal 505 receives the configuration message 520, the terminal 505 sets a logical channel, a MAC-d flow, or a transmission buffer according to the configuration information included in the configuration message 520. The minimum set indicator 525 is included in the setting message 520 or the minimum set indicator 525 is included in the setting message 520. Check the destination that can be transferred. That is, the terminal 505 recognizes that the set logical channel, the MAC-d flow, or the data of the transmission buffer can be transmitted to the minimum set according to the minimum set indicator 525.

Data that can be transmitted in the minimum set is called a minimum set PDU. In other words, the minimum set PDU means the data of the logical channel or the data of the MAC-d flow or the data stored in the transmission buffer that the RNC informs the minimum set of transmissions.

The terminal 505 cannot transmit data of other logical channels or MAC-e flows or transmission buffers not defined as the minimum set because the UE 505 does not have the permission of the Node B 510 or the transmission output is not sufficient. The data defined by these data are transmitted immediately without waiting for scheduling of the base station.

6 is a flowchart illustrating an operation of a UE performing minimum set transmission of an E-DCH according to an embodiment of the present invention. Herein, it is assumed that the terminal configures a transmission buffer in the MAC-e layer. However, even if the transmit buffer is replaced with an RLC buffer, the following operation is applicable as it is.

First, the terminal receives a configuration message 520 as shown in FIG. 5 to configure a corresponding MAC-d flow, logical channel, or transmission buffer. Then, the MAC-e layer of the UE configures the MAC-e PDU according to the transmission resources allowed by the Node B in every transmission period (TTI). When configuring a MAC-e PDU to be transmitted in a new Transmission Time Interval (TTI), the UE checks which transmission buffer's PDU is to be transmitted before the new TTI starts. The following operation is performed by the MAC-e layer of the terminal before a new TTI is started.

Referring to FIG. 6, in step 605, the UE starts a scheduling operation just before a new TTI starts. In step 610, the UE checks whether there is a transmission resource allowed for the new TTI from the Node B scheduler and / or whether a transmission output is available.

If there is an allowed transmission resource and a transmission output is available, the flow proceeds to step 615 where the terminal determines the size of the MAC-e PDU that can be transmitted to the transmission resource. The highest priority data is taken from the corresponding transmission buffer and stored in the payload portion of the MAC-e PDU. In step 620, the UE repeats the operation of step 615 until it fills the MAC-e PDU of the determined size. In step 625, the UE transmits the configured MAC-e PDU to the base station through the uplink in the new TTI.

On the other hand, if there is no transmission resource allowed for the new TTI or no transmission output is available in step 610, the process proceeds to step 630 and the UE checks whether there is a minimum set PDU among data stored in the transmission buffer. Herein, if there is data corresponding to the MAC-d flow, the logical channel, or the transmission buffer corresponding to the minimum set indicator notified from the RNC, the terminal determines that the minimum set PDU exists. If there is no minimum set PDU in step 630, the process proceeds to step 635 and the terminal does not transmit data to the new TTI.

On the other hand, if there is a minimum set PDU in step 630, in step 640, the UE configures a MAC-e PDU by storing one minimum set PDU having the highest priority in the payload of the MAC-e PDU. In this case, the UE configures the minimum set PDU as a MAC-e PDU having the smallest size among data sizes allowed for the E-DCH. In step 645, the UE transmits the configured MAC-e PDU in a new transmission interval.

As such, the UE allows transmission for the minimum set PDU set even when there is no transmission resource allowed, and transmits the minimum set PDU having the highest priority, instead of transmitting all the minimum set PDUs stored at that time. do.

In the above-described embodiments of the present invention, a method of designating whether minimum set transmission is possible for each logical channel, MAC-d flow, or transmission buffer is provided. Hereinafter, a description will be given with an example of whether minimum set transmission is possible for each MAC-d flow. Various types of MAC-d flows may be configured in one terminal, and various services may be mapped to the MAC-d flows. In addition, the transmission characteristics required for each service may be different. Therefore, if a particular MAC-d flow can use the minimum set, it may be desirable to specify the size of the MAC-e PDU that the MAC-d flow can transmit to the minimum set.

Therefore, another embodiment of the present invention to be described later provides a method for defining not only the minimum set, but also the size of the MAC-e PDU that can be transmitted in the minimum set.

FIG. 7 is a signal flowchart illustrating an operation in which a network defines and transmits a minimum set of E-DCHs and a size of a MAC-e PDU that can be transmitted using the minimum set of E-DCHs. Referring to FIG. Here, reference numeral 705 denotes a UE, reference numeral 710 denotes a Node B that can communicate with the terminal 705, and reference numeral 715 denotes the Node B 710 and the terminal 705. Means a radio network controller (RNC) 715 that controls the communication.

Referring to FIG. 7, when the RNC 715 configures the E-DCH, the RNC 715 includes MAC-d flow configuration information in the configuration message 720 related to the E-DCH. The MAC-d flow configuration information may include, for example, mapping information indicating which logical channels the MAC-d flow is mapped to, and a minimum set indicator indicating whether the MAC-d flow can use minimum set transmission. 725) and a maximum allowed E-TFCI (730) indicating the maximum size of the MAC-e PDU that can be transmitted in the minimum set. Here, the E-DCH Transport Format Combination index (E-TFCI) is a logical identifier indicating the size of the MAC-e PDU.

When configuring the E-DCH for the terminal 705, the RNC 715 determines whether there is a logical channel that needs to be transmitted in at least three of the logical channels configured in the terminal 705. For example, a dedicated control channel (DCCH) carrying an RRC message related to an RRC connection between the terminal 705 and the RNC 715 needs to be transmitted in at least three sets. The RNC 715 includes the minimum set indicator 725 and the maximum allowed E-TFCI 730 in the configuration information of the MAC-d flow associated with the logical channel that needs to be transmitted in the minimum set. The maximum allowable E-TFCI 730 may mean an indicator indicating the maximum E-TFC among the E-TFCs that can be used for the minimum set transmission.

The E-TFCI consists of the sizes of MAC-e PDUs. For example, the size of the MAC-e PDU that can be used by the terminal 705 is as follows.

100 bit, 200 bit, 300 bit, 400 bit, 500 bit

Then, E-TFCI 0 means 100 bits, E-TFCI 1 means 200 bits, E-TFCI 2 means 300 bits, E-TFCI 3 means 400 bits, and E-TFCI 4 means 500 bits. If the maximum allowable E-TFCI 730 is E-TFCI 1, the corresponding MAC-d flow may perform minimum set transmission using E-TFCI 0 or E-TFCI 1. As a result, the terminal 705 may transmit a 100-bit or 200-bit MAC-e PDU with a minimum set transmission.

The RNC 715 considers the following when determining the configuration information of a specific MAC-d flow.

If the MAC-d flow is a MAC-d flow capable of minimum set transmission, the maximum allowable E-TFCI is set in the MAC-d flow configuration information. If not, do not set.

If the MAC-d flow is a MAC-d flow capable of at least set transmission, the MAC-d PDU corresponds to a MAC-e PDU having a size that is appropriate in consideration of the required QoS of the logical channel connected to the MAC-d flow. To set the maximum allowed E-TFCI. For example, if the logical channel connected to the MAC-d flow requires a fixed bandwidth of 10 kbps, the 10-msec TTI sets an E-TFCI corresponding to 100 bits as the maximum allowed E-TFCI for the MAC-d flow. .

The terminal 705 receives the E-DCH configuration message 720, and the minimum set indicator 725 and the maximum allowable E-TFCI 730 are included in the MAC-d flow configuration information in the E-DCH configuration message 720. If included, the MAC-e PDU is transmitted using the maximum allowed E-TFCI or lower E-TFCI even without being scheduled for data of the MAC-d flow. Since the operation flow performed by the terminal 705 is the same as that shown in FIG. 6, it will be omitted. 6, in step 630 of FIG. 6, the UE sets a minimum set according to the minimum set indicator 725 and the maximum allowed E-TFCI 730 in the MAC-d flow configuration information in the E-DCH configuration message 720 received from the RNC. Check whether the PDU exists. That is, if there is data stored for the corresponding MAC-d flow indicated by the minimum set indicator 725 or the maximum allowed E-TFCI 730, it is determined that there is a minimum set PDU.

In FIG. 7, when the MAC-d flow can perform the minimum set transmission, it is illustrated that both the minimum set indicator and the maximum allowed E-TFCI are included in the MAC-d flow configuration information of the E-DCH configuration message. In the example, the RNC may include only the maximum allowed E-TFCI without including the minimum set indicator in the MAC-e flow configuration information. This is because the UE can determine whether the minimum set transmission is possible with or without the maximum allowable E-TFCI.

8 shows the structure of the transmitting side of the RNC for specifying and notifying a minimum set of E-DCHs according to a preferred embodiment of the present invention.

Referring to FIG. 8, the controller 810 selects a minimum number of targets that can be transmitted regardless of allocated transmission resources or available transmission outputs. Here, the transmittable object may be a MAC-d flow, a logical channel, or a transmission buffer. At this time, the controller 810 selects a MAC-d flow, a logical channel, or a transmission buffer corresponding to delay sensitive data or relatively important data as the minimum set. For example, the controller 810 selects a minimum set of MAC-d flows connected to a logical channel carrying a radio resource control (RRC) message.

The minimum set information generator 820 sets minimum set information indicating whether the selected object is transmitable regardless of the allocated transmission resources or available transmission outputs in configuration information for setting the selected object. do. According to the aforementioned embodiment, the minimum set information may include a minimum set indicator indicating whether the selected MAC-d flow or logical channel or transmission buffer can be transmitted regardless of allocated transmission resources or available transmission outputs. It includes. In this case, the minimum set information generator 820 may indicate that the object is selected as the minimum set by setting the minimum set indicator to '1' or simply including the minimum set indicator in the configuration information. In another embodiment, the minimum set information includes a maximum allowed E-TFCI, which is a logical identifier indicating the size of the MAC-e PDU allowed for the selected MAC-d flow.

Then, the message transmitter 830 transmits the configuration information including the minimum set information in a setting message for setting the target.

9 illustrates a receiving side structure of a user terminal performing minimum set transmission of an E-DCH according to an embodiment of the present invention.

Referring to FIG. 9, the message receiver 910 corresponds to the message transmitter 830 of FIG. 8, and provides configuration information for setting a MAC-d flow, a logical channel, or a transmission buffer related to the setup of an E-DCH. Receive. The configuration information may include minimum set information indicating whether the object to be set can be transmitted regardless of allocated transmission resources or available transmission outputs. According to the above-mentioned embodiment, the minimum set information includes a minimum set indicator indicating whether the MAC-d flow, the logical channel, or the transmission buffer can be transmitted regardless of allocated transmission resources or available transmission outputs. In another embodiment, the minimum set information includes a maximum allowed E-TFCI, which is a logical identifier indicating the size of the MAC-e PDU allowed for the selected MAC-d flow.

The E-DCH controller 920 configures a MAC-e layer including a MAC-d flow or a logical channel or a transmission buffer according to the configuration information in the MAC-e transmitter 930, and sets a minimum set according to the minimum set information. Identifies the target corresponding to In this case, the E-DCH control unit 920 determines whether the corresponding target is the minimum set according to whether the minimum set indicator is set to '1' or whether the minimum set indicator is included in the configuration information. do. In another exemplary embodiment, the E-DCH control unit 920 determines whether the corresponding target is the minimum set according to whether the maximum allowable E-TFCI is included in the configuration information.

After the MAC-e layer is configured, the E-DCH controller 920 checks whether there are allowed transmission resources and available transmission outputs in every transmission period (TTI). If there is an allowed transmission resource and an available transmission output, the MAC-e transmitter 930 transmits E-DCH data. If there is no transmission resource allowed in the new transmission period (TTI) or no transmission output is available, the E-DCH controller 920 determines whether there is a minimum set PDU (Protocol Data Unit) to transmit according to the minimum set information. Check it. Although not shown in detail, the E-DCH control unit 920 confirms whether data corresponding to the minimum set is stored in a transmission buffer provided in the RLC layer or the MAC-e layer.

If it is determined that the minimum set PDU exists, the MAC-e transmitter 930 reads the minimum set PDU from the transmission buffer, configures the MAC-e PDU, and then transmits the MAC-e PDU through uplink. do. At this time, if there are several minimum set PDUs, the MAC-e transmitter 930 transmits the minimum set PDU having the highest priority. In addition, if the configuration information includes the maximum allowed E-TFCI, the MAC-e transmitter 930 transmits the minimum set PDU according to the maximum allowed E-TFCI or less than the E-TFCI.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but 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 of the disclosed invention are briefly described as follows.

According to the present invention, a minimum set PDU is defined in a mobile communication system for transmitting packet data through uplink, and transmission of the minimum set PDU with high priority is allowed, thereby preventing a decrease in transmission efficiency of the reverse link. . In particular, the present invention minimizes the inefficiency due to unscheduled data transmission by limiting the target of data that the user terminal can autonomously transmit without being scheduled by the system.

Claims (22)

In at least three notification methods for transmitting uplink data in a mobile communication system, Selecting at least three targets for transmission regardless of allocated transmission resources or available transmission outputs; Setting minimum set information in the configuration information for the selected object, the minimum set information indicating whether the selected object can be transmitted regardless of an allocated transmission resource or an available transmission output; And including the configuration information including the minimum set information in a configuration message for setting the target and transmitting the configuration information. The method of claim 1, wherein the minimum set information comprises: Wherein the corresponding Media Access Control-data (MAC) flow or logical channel or transmission buffer includes a minimum set indicator indicating whether the transmission is possible regardless of the allocated transmission resources or available transmission outputs. Way. The method of claim 1, wherein the minimum set information comprises: Contains a logical identifier indicating the size of the MAC-e Media Access Control-enhanced Protocol Data Unit (PDU) allowed for a MAC-d flow corresponding to transmittable data, regardless of the allocated transmission resources or available transmission outputs. Characterized in that the method. The method of claim 3, wherein the logical identifier is, The maximum allowed E-DCH transport format combination index (E-TFCI) indicating a maximum size of a MAC-e PDU that can be transmitted in a minimum set. The method of claim 1, wherein the selecting process comprises: And selecting the minimum set of MAC-d flows, logical channels, or transmission buffers corresponding to delay-sensitive data or relatively important data. The method of claim 1, wherein the selecting process comprises: And selecting the minimum set of MAC-d flows associated with a logical channel carrying a radio resource control (RRC) message. A minimum set of notification device for transmitting uplink data in a mobile communication system, A control unit for selecting a minimum number of transmittable targets regardless of allocated transmission resources or available transmission outputs; A minimum set information generator configured to set minimum set information indicating whether the selected object is transmitable regardless of an allocated transmission resource or an available transmission output, in configuration information for the selected object; And a message transmitter to transmit the configuration information including the minimum set information to a configuration message for setting the destination. The method of claim 7, wherein the minimum set information, Wherein the corresponding Media Access Control-data (MAC) flow or logical channel or transmission buffer includes a minimum set indicator indicating whether the transmission is possible regardless of the allocated transmission resources or available transmission outputs. Device. The method of claim 7, wherein the minimum set information, Contains a logical identifier indicating the size of the MAC-e Media Access Control-enhanced Protocol Data Unit (PDU) allowed for a MAC-d flow corresponding to transmittable data, regardless of the allocated transmission resources or available transmission outputs. Said device. The method of claim 9, wherein the logical identifier is, And a maximum allowed E-DCH transport format combination index (E-TFCI) indicating a maximum size of a MAC-e PDU that can be transmitted in a minimum set. The method of claim 7, wherein the control unit, And the MAC-d flow, logical channel or transmission buffer corresponding to delay sensitive data or relatively important data is selected as the minimum set. The method of claim 7, wherein the control unit, And selecting the minimum set of MAC-d flows associated with a logical channel carrying a radio resource control (RRC) message. In the method of transmitting uplink data according to the minimum set in the mobile communication system, Receiving configuration information of the object including minimum set information indicating a destination that can be transmitted regardless of allocated transmission resources or available transmission outputs; If there is no transmission resource allowed in the new transmission section or transmission output is not available, checking whether there is a minimum set PDU (Protocol Data Unit) to be transmitted according to the minimum set information, and And if the minimum set PDU is present, transmitting the minimum set PDU through uplink. The method of claim 13, wherein the minimum set information, Wherein the corresponding Media Access Control-data (MAC) flow or logical channel or transmission buffer includes a minimum set indicator indicating whether the transmission is possible regardless of the allocated transmission resources or available transmission outputs. Way. The method of claim 13, wherein the minimum set information, Contains a logical identifier indicating the size of the MAC-e Media Access Control-enhanced Protocol Data Unit (PDU) allowed for a MAC-d flow corresponding to transmittable data, regardless of the allocated transmission resources or available transmission outputs. Characterized in that the method. The method of claim 15, wherein the logical identifier is, The maximum allowed E-DCH transport format combination index (E-TFCI) indicating a maximum size of a MAC-e PDU that can be transmitted in a minimum set. The method of claim 13, wherein the transmitting step, The method as claimed in claim 1, wherein radio resources are allocated to the minimum set PDU having the highest priority and transmitted through the uplink. In the apparatus for transmitting uplink data according to at least three in the mobile communication system, A message receiving unit for receiving configuration information of the target including minimum set information indicating a transferable target regardless of allocated transmission resources or available transmission outputs; A control unit for checking whether there is a minimum set PDU (Protocol Data Unit) to be transmitted according to the minimum set information when there is no transmission resource allowed or a transmission output is not available in a new transmission section; And a data transmitter for transmitting the minimum set PDU through uplink if the minimum set PDU exists. The method of claim 18, wherein the minimum set information, Wherein the corresponding Media Access Control-data (MAC) flow or logical channel or transmission buffer includes a minimum set indicator indicating whether the transmission is possible regardless of the allocated transmission resources or available transmission outputs. Device. The method of claim 18, wherein the minimum set information, Contains a logical identifier indicating the size of the MAC-e Media Access Control-enhanced Protocol Data Unit (PDU) allowed for a MAC-d flow corresponding to transmittable data, regardless of the allocated transmission resources or available transmission outputs. Said device. The method of claim 20, wherein the logical identifier is, And a maximum allowed E-DCH transport format combination index (E-TFCI) indicating a maximum size of a MAC-e PDU that can be transmitted in a minimum set. The method of claim 18, wherein the data transmission unit, And the radio resource is allocated to the minimum set PDU having the highest priority and transmitted through the uplink.

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