KR20060054658A - Method and apparatus for signaling of control information for uplink packet transmission - Google Patents

Abstract

According to the present invention, in a mobile communication system supporting a reverse packet data service, an arbitrary control information is selected from control information for data transmission of the terminal and a single control channel including an indicator indicating the selected control information. Transmission reduces scheduling delay of reverse packet data and provides an efficient control information signaling method.

E-DCH, E-DPCCH, SCHEDULING INFORMATION

Description

TECHNICAL AND APPARATUS FOR SIGNALING OF CONTROL INFORMATION FOR UPLINK PACKET TRANSMISSION}             

1 is a block diagram showing a radio access network (UTRAN) of a typical UMTS system.

2 is a diagram illustrating a layer showing an interface between a general terminal and a radio network controller (RNC).

3 is a diagram illustrating transmission of data through an E-DCH in a general radio link.

4 is a diagram illustrating a procedure for transmitting and receiving a message through a general E-DCH.

5 illustrates a reverse physical channel structure of a typical terminal.

6 is a diagram showing the structure of an E-DPCCH according to a preferred embodiment of the present invention.

7 is a diagram illustrating a transmitter structure of a terminal according to an exemplary embodiment of the present invention.

8 illustrates a receiver structure of a terminal according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to asynchronous wideband code division multiple access (WCDMA) communication, and more particularly, to a method for signaling status information of terminals for reverse packet transmission in a soft handoff region.

The Universal Mobile Telecommunication Service (UMTS) system, a third-generation mobile communications system based on the European System of Global Communications for GSM (GSM) and using WCDMA, is available to mobile or computer users anywhere in the world. It provides a consistent service for transmitting packet-based text, digitized voice or video and multimedia data at speeds of 2 Mbps and higher. UMTS uses the concept of virtual access, which is a packet-switched connection that uses a packet protocol such as Internet Protocol (IP), and can always be connected to any other end in the network.

FIG. 1 is a block diagram showing a UMTS Terrestrial Radio Access Network (hereinafter referred to as "UTRAN") of a general UMTS system.

The UTRAN 12 is composed of radio network controllers (hereinafter referred to as " RNC ") 16a, 16b and base stations Node Bs 18a, 18b, 18c, and 18d. Equipment 20 is connected to the Core Network 10. There may be a plurality of cells below the base stations 18a, 18b, 18c, 18d, and each RNC 16a, 16b controls the corresponding lower base stations 18a, 18b, 18c, 18d, Each base station 18a, 18b, 18c, 18d controls the corresponding lower cells. The base stations and cells controlled by one RNC are collectively referred to as a Radio Network Subsystem (hereinafter referred to as "RNS") 14a and 14b.

The RNC allocates or manages radio resources of base stations it controls. The base station serves to provide actual radio resources. Radio resources are configured for each cell, and the radio resources provided by the base station mean radio resources of cells managed by the base station. The terminal may configure a radio channel and perform communication using radio resources provided by a specific cell of a specific base station. From the standpoint of the terminal, the distinction between the base station and the cell is meaningless, and since only the physical layer configured for each cell is recognized, the base station and the cell will be described below with the same meaning.

Hereinafter, a detailed hierarchical structure of the Uu interface between the terminal and the RNC will be described with reference to FIG. 2.

Referring to FIG. 2, the Uu interface is a control plane 30 used to exchange control signals between the terminal and the RNC and a user plane 32 used to transmit actual data. Are distinguished.

The control plane 30 may include a radio resource control (RRC) layer 32, a radio link control (RLC) layer 40, a media access control (MAC) layer 42, and a physical (hereinafter referred to as "PHY") layer. Layer 44, and the user plane 32 includes a packet data control protocol (PDCP) layer 36, a broadcast / multicast control (BMC) layer 38, an RLC layer 40, and a MAC layer. 42) and a physical layer 44. The physical layer 44 is located in each cell, and the MAC layer 42 to the RRC layer 34 are located in the RNC.

The physical layer 44 is a layer that provides an information transmission service using a radio transfer technology, and corresponds to a first layer of an Open Systems Interconnection (OSI) model. The physical layer 44 and the MAC layer 42 are connected by transport channels, and transport channels are defined by the manner in which specific data is processed in the physical layer.

The MAC layer 42 and the RLC layer 40 are connected via logical channels. The MAC layer 42 delivers the data delivered by the RLC layer 40 through the logical channel to the physical layer through the appropriate transport channel, and the data delivered by the physical layer 44 through the transport channel through the appropriate logical channel. It serves to convey to 40. In addition, by inserting additional information into the data received through the logical channel or the transmission channel or by analyzing the inserted additional information, it takes appropriate action and controls the random access operation. The portion related to user plane 30 in this MAC layer 42 is called MAC-d, and the portion related to control plane 32 is called MAC-c.

The RLC layer 40 is responsible for establishing and releasing logical channels. The RLC layer 40 may operate in one of three operation modes, that is, an acknowledgment mode (AM), an unacknowledged mode (UM), and a transparent mode (TM), and provide different functions for each operation mode. In general, the RLC layer 40 is responsible for dividing or assembling a service data unit (hereinafter referred to as "SDU") from an upper layer into an appropriate size, and for correcting an error.

The PDCP layer 36 is located above the RLC layer 40 in the user plane 32. The PDCP layer 36 compresses and restores headers of data transmitted in the form of IP packets, and provides RNC services to specific terminals with mobility. It is responsible for the lossless transfer of data, etc. under the situation that is changed.

The characteristics of a transport channel connecting the physical layer 44 and upper layers include physical layer processing such as convolutional channel encoding, interleaving, and service-specific rate matching. It is determined by the TF (Transport Format).

In particular, the UMTS system uses an Enhanced Uplink Dedicated Channel (hereinafter referred to as "E-DCH") to further improve the performance of packet transmission in reverse (UL: Uplink) communication from the terminal to the base station. . E-DCH supports technologies such as Hybrid Automatic Retransmission Request (HARQ) and Node B controlled scheduling (HARQ) to support more stable high-speed data transmission.

3 is a diagram illustrating transmission of data through an E-DCH in a general radio link.

Reference numeral 100 denotes a base station supporting the E-DCH and 101 to 104 are terminals for transmitting the E-DCH. The base station 100 determines the channel status of the terminals 101 to 104 using the E-DCH and schedules data transmission of each terminal. The scheduling allocates a low data rate to a terminal far from the base station and a high data rate to a near terminal while preventing the measured noise rise of the base station from exceeding a target noise increase value in order to improve the performance of the entire system. Do this by assigning.

4 is a diagram illustrating a procedure for transmitting and receiving a message through a general E-DCH.

In step 202, the E-DCH is configured through a process of delivering messages through a dedicated transport channel between the base station and the terminal. If the E-DCH is configured, the UE informs the base station of UE status information in step 204. In this case, the terminal state information may include terminal transmission power information indicating reverse channel information, extra power information that can be transmitted by the terminal, and an amount of data to be transmitted in a buffer of the terminal.

In step 206, the base station that receives the scheduling information from the plurality of terminals in communication, monitors the terminal state information of the plurality of terminals in order to schedule data transmission of each terminal. In step 208, the base station determines to allow the reverse packet transmission to the terminal, and transmits the scheduling assignment information to the terminal. The scheduling allocation information includes an allowed data rate and an allowable timing.

In step 210, the UE determines the transmission format (TF) of the E-DCH to be transmitted in the reverse direction by using the scheduling assignment information. In step 212, the UE transmits reverse (UL) packet data through the E-DCH and the TF information. That is, a transport format resource indicator (TFRI) is transmitted to the base station. In step 216, the base station determines whether there is an error in the TF information and the packet data. In step 218, the base station transmits a non-acknowledge (NACK) when any error occurs, and transmits an acknowledgment (ACK) to the terminal through the ACK / NACK channel when all errors are found.

When the ACK information is transmitted, the terminal transmits new user data through the E-DCH when the packet data is transmitted, but when the NACK information is transmitted, the terminal retransmits the same packet data through the E-DCH. .

The E-DCH is transmitted from the terminal to the base station through the E-DPDCH (E-DCH dedicated physical data channel) through channel coding of data. At this time. Control information for the E-DCH should also be transmitted. Control information on the E-DCH may include scheduling information 204 and E-DCH format information 212 in FIG. 4. The scheduling information is information indicating a state of a terminal, and information necessary for the base station to perform scheduling for the terminal may include buffer state information of the terminal, reverse channel state information, or supportable data rate of the terminal. The E-DCH format information may include a data rate, HARQ operation information, QoS information, etc. of the transmitted E-DCH, and should always be accompanied and transmitted at the time when the E-DCH is transmitted. In order to transmit control information in transmitting the E-DPDCH, the E-DPDCH is transmitted with an E-DPCCH (E-DCH dedicated physical control channel). However, since the E-DPCCH needs to be reduced to a minimum for easy implementation of the power amplifier of the terminal, it is difficult to transmit both the scheduling information and the E-DCH format information, which are control information, using the E-DPCCH.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, provides a method for efficiently transmitting reverse packet data related control information of a terminal required by a base station in reverse packet transmission. Is in.

Another object of the present invention is to selectively provide transmission of control information through a control channel.

It is another object of the present invention to provide a method for indicating the format of an E-DPCCH in reverse packet transmission.

It is still another object of the present invention to provide an apparatus for transmitting / receiving a control channel including two types of control information.

Method according to an embodiment of the present invention created to achieve the object as described above,

In the method for transmitting the control information of the terminal for the reverse packet data transmission,

Selecting one of control information including format information of the reverse packet data transmitted through a reverse dedicated physical data channel and scheduling information indicating a state of the terminal;                         

And an indicator indicating the selected information, and transmitting the selected control information to a base station through a reverse dedicated physical control channel.

An apparatus according to an embodiment of the present invention, in the apparatus for transmitting the control information of the terminal for reverse packet data transmission,

A first mux for selecting one of control information including format information of the reverse packet data transmitted through a reverse dedicated physical data channel and scheduling information indicating a state of the terminal according to a control signal;

A control unit for generating a control signal for controlling a selection operation of the first mux and an indicator indicating the selected information and transmitting the indicator to the mux;

A reverse dedicated physical control channel comprising the selected information and the indicator;

And a second mux process for generating a transmission signal transmitted to the base station through the reverse dedicated physical control channel.

An apparatus according to another embodiment of the present invention, in the device for receiving the control information of the terminal for reverse packet data transmission,

A first mux for receiving selected control information from among control information including the reverse packet data format information and scheduling information indicating the state of the terminal and dividing the received control information into a reverse dedicated physical control channel; ,

A control unit for generating an identification signal for discriminating whether the received control information is the format information or the scheduling information;                         

And a third mux recognizing whether the control information is the format information or the scheduling information according to the identification signal of the controller.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. Like reference numerals are used to designate like elements even though they are shown in different drawings, and detailed descriptions of related well-known functions or configurations are not required to describe the present invention. If it is determined that it can be blurred, the detailed description thereof will be omitted. 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 present invention provides a method for a UE to selectively transmit E-DCH related control information to a base station.

5 generally illustrates the types of transmission physical channels of a terminal.

Referring to Figure 5, the terminal transmits the physical channels in the reverse direction, first, DPCCH (dedicated control channel 502 serves as a power control, or phase reference, etc. Also, it is used for the transmission of voice or data information The DPDCH (Dedicated Physical Data Channel) 501 is transmitted in units of multiples of a 10 ms radio frame, and the HS-DPCCH 504 used in the High Speed Downlink Packet Access (HSDPA) scheme is used for forward channel information of the UE. Forward HARQ ACK / NACK The DPCCH, DPDCH, and HS-DOCCH may be transmitted or not transmitted depending on the situation.

Channels for the E-DCH include an E-DPDCH 505 and an E-DPCCH 506. The E-DPDCH 505 and the E-DPCCH 506 may be transmitted in a subframe 507 of at least 2 ms. The E-DPDCH 505 transmits the packet data E-DCH, and the E-DPCCH 506 transmits control information for the E-DCH.

In general, control information for an E-DCH includes scheduling information and E-DCH format information. When the E-DCH is transmitted through the E-DPDCH, the base station needs to know the format information of the E-DCH to enable decoding or HARQ operation of the E-DCH. That is, since the format information of the E-DCH must be transmitted to the E-DPCCH during the E-DCH transmission, the scheduling information of the UE is difficult to transmit the E-DPCCH through the E-DPCCH. Accordingly, the MAC-e signaling method for transmitting control information together with data in an E-DCH Packet Data Unit (PDU) and transmitting the data is used. That is, since any control information is included in the E-DCH and transmitted through the E-DPDCH, there is no need to use the E-DPCCH. However, since the MAC-e signaling method is transmitted on the E-DCH, additional delay according to HARQ occurs according to the characteristics of the E-DCH. In this case, when any control information transmitted through MAC-e signaling is scheduling information, there is a high probability that data that can be transmitted exists in the terminal buffer. Therefore, even if the additional delay occurs, the delay is not a big problem because the existing data is transmitted to the E-DCH during the delay period.

However, if any control information transmitted through MAC-e signaling during the initial transmission of E-DCH is scheduling information, a delay according to HARQ occurs. In this case, transmission of the E-DCH during the delay is difficult, and thus system performance may be reduced. Therefore, if there is no E-DCH transmission, the scheduling information indicating the state of the terminal is transmitted to the E-DPCCH. That is, when the E-DCH is not transmitted, since the format information of the E-DCH is not transmitted to the E-DPCCH in the E-DPCCH, the scheduling information is included in the E-DPCCH and transmitted, and the E-DCH is scheduled during transmission If the information needs to be transmitted, the scheduling information is transmitted through MAC-e signaling.

At this time, when the base station receives the E-DPCCH, an E-DPCCH indicator indicating whether scheduling information of the E-DPCCH is included is required.

Hereinafter, a method of including the E-DPCCH indicator in the E-DPCCH according to the present invention will be described with reference to FIG. 6.

6 is a diagram showing the structure of an E-DPCCH according to a preferred embodiment of the present invention.

Referring to FIG. 6, the E-DPCCH 601 may be transmitted in a 2 ms length unit or in a 10 ms length unit according to the transmission time unit (TTI) of the E-DCH. Five E-DPCCHs may be transmitted in one 10ms radio frame 602 when transmitted in 2ms length unit, and one E-DPCCH may be transmitted in 10ms radio frame 602 when transmitted in 10ms length unit. Can be. In the case of the 10 ms length unit, a new format suitable for the 10 ms length is used, or the format of the 2 ms length unit can be repeatedly transmitted five times.

In FIG. 6, an E-DPCCH subframe 603 having a length of 2 ms is used. The E-DPCCH subframe 603 includes information 604 included and an E-DPCCH indicator 605 indicating whether the included information 604 is scheduling information or E-DCH format information.

The E-DPCCH indicator 605 may be represented in various ways. For example, the E-DPCCH indicator 605 using 1 bit indicates that the 1-bit is '0' scheduling information, and '1' indicates the E-DCH format information (or vice versa).

As another example, there is a method of sending the scheduling request information included in the E-DCH format information and the E-DPCCH indicator together. In detail, the E-DCH format information includes scheduling request information, or data rate request information, which is request information for transmission of data to be transmitted next. That is, by using 1-bit information as request information for whether or not to increase the data rate of the next data to be transmitted, "UP" is sent if the data rate is to be increased, otherwise "NO UP (Don't care)". " In this case, the scheduling request information may include priority information associated with QoS information of the data, that is, whether the priority of the information to increase the data rate is high or low. In this case, since more than one bit of information is required, two bits can be used. In this case, three out of four two-bit scheduling request information are format information of "UP" of high priority data, "UP" of low priority data, and "No UP" if two priorities are added. An indicator indicating that scheduling information is included in the E-DPCCH is included.

Hereinafter, a method of transmitting / receiving an E-DPCCH indicator of a terminal and a base station according to the present invention will be described with reference to FIGS. 7 to 8.                     

7 shows the structure of a terminal transmitter according to a preferred embodiment of the present invention.

Referring to FIG. 7, when the UE transmits E-DCH format information 701 or scheduling information 702 to the E-DPCCH, the E-DPCCH controller 704 controls the multiplexer 706 to control information. The E-DCH format information 701 or scheduling information 702 is selected. The multiplexer 706 transmits the selected control information to the E-DPCCH 715. At this time, the E-DPCCH controller 704 inputs an E-DPCCH indicator 703 to the multiplexer 706 to perform time multiplexing with the E-DCH format information 701 or the scheduling information 702. The E-DPCCH 715 including the selected control information is multiplexed and a power setter together with the E-DPDCH 714, the DPDCH 713, the DPCCH 712, and the HS-DPCCH 711, which are other reverse physical channels of the UE. At 716, the sign is multiplexed and the power is set and sent to the base station 717.

8 illustrates a receiver structure of a base station for receiving information transmitted from a terminal.

Referring to FIG. 8, the demultiplexer 1 802 receives information 801 transmitted by the terminal and divides the information 801 into physical channels. The physical channels to be distinguished are the E-DPCCH 803, the E-DPDCH 804, the DPDCH 805, the DPCCH 806, and the HS-DPCCH 807. The E-DPCCH 803 is input to the demultiplexer 2 808 to demultiplex the E-DPCCH indicator 809 and other information 810. The E-DPCCH indicator 809 is input to the indicator controller 813 to determine whether the information included in the E-DPCCH is E-DCH format information or scheduling information and uses the control information 814 to demultiplexer 2 ( 815 is controlled. The information 810 output from the demultiplexer 2 808 is input to the demultiplexer 3 815, and the E-DCH format information 811 is output from the demultiplexer 3 815 according to the control information 814. It is recognized as scheduling information 812.

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 ones of the disclosed inventions will be briefly described as follows.

The present invention selectively transmits control information necessary for reverse packet transmission in a WCDMA communication system using an E-DCH through a control channel. By transmitting the indicator together on the E-DPCCH indicating the selected control information, it is possible to reduce the delay time during scheduling and enable efficient signaling.

Claims (24)

In the method for transmitting the control information of the terminal for the reverse packet data transmission, Selecting one of control information including format information of the reverse packet data transmitted through a reverse dedicated physical data channel and scheduling information indicating a state of the terminal; And transmitting the indicator indicating the selected information and the selected control information to a base station through a reverse dedicated physical control channel. The method of claim 1, wherein the selecting process comprises: And if the reverse packet data is initial transmission, selecting the scheduling information. The format information of the reverse packet data according to claim 1, And data rate, retransmission operation information, and quality information of the reverse packet data. The method of claim 1, wherein the scheduling information. And buffer state information of the terminal, the reverse channel state information, and a data rate that can be supported by the terminal. The method of claim 1, wherein the indicator, And indicating whether the selected control information is the scheduling information or the format information by one bit of information. The method of claim 2, wherein the indicator, And whether the format information is included or whether the scheduling information is included in two bits. The method of claim 6, The indicator '10' indicates a case of requesting to increase the rate of high priority data, and the indicator '01' indicates a case of requesting to increase the rate of low priority data, and the indication If the value is '00', it indicates that there is no data to increase the data rate, and indicates the format information. The method of claim 6, If the indicator is '11', the indicator indicating that the selected control information is scheduling information. An apparatus for transmitting control information of a terminal for reverse packet data transmission, the apparatus comprising: A first mux for selecting one of control information including format information of the reverse packet data transmitted through a reverse dedicated physical data channel and scheduling information indicating a state of the terminal according to a control signal; A control unit for generating a control signal for controlling a selection operation of the first mux and an indicator indicating the selected information and transmitting the indicator to the mux; A reverse dedicated physical control channel comprising the selected information and the indicator; And a second mux process of generating a transmission signal transmitted to a base station through the reverse dedicated physical control channel. The method of claim 9, wherein the control unit, And if the reverse packet data is initial transmission, selecting the scheduling information. The method of claim 9, wherein the format information of the reverse packet data, And data rate, retransmission operation information, and quality information of the reverse packet data. The method of claim 9, wherein the scheduling information. And buffer state information of the terminal, the reverse channel state information, and a supportable data rate of the terminal. The method of claim 9, wherein the indicator, And 1 bit of information indicating whether the selected control information is the scheduling information or the format information. The method of claim 9, wherein the indicator, And 2 bits indicating whether the format information is included or the scheduling information is included. The method of claim 14, The indicator '10' indicates a case of requesting to increase the rate of high priority data, and the indicator '01' indicates a case of requesting to increase the rate of low priority data, and the indication If the value is '00', the device indicates that there is no data to increase the data rate, and indicates the format information. The method of claim 14, If the indicator is '11', the apparatus indicates that the selected control information is scheduling information. In the device for receiving the control information of the terminal for the reverse packet data transmission, A first mux for receiving selected control information from among control information including the reverse packet data format information and scheduling information indicating the state of the terminal and dividing the received control information into a reverse dedicated physical control channel; , A control unit for generating an identification signal for discriminating whether the received control information is the format information or the scheduling information; And a third mux recognizing whether the control information is the format information or the scheduling information according to the identification signal of the controller. The method of claim 17, wherein the control unit, And if the reverse packet data is initial transmission, selecting the scheduling information. The method of claim 17, wherein the format information of the reverse packet data, And data rate, retransmission operation information, and quality information of the reverse packet data. 18. The method of claim 17, wherein the scheduling information. And buffer state information of the terminal, the reverse channel state information, and a supportable data rate of the terminal. The method of claim 17, wherein the indicator, And 1 bit of information indicating whether the selected control information is the scheduling information or the format information. The method of claim 17, wherein the indicator, And 2 bits indicating whether the format information is included or the scheduling information is included. The method of claim 22, The indicator '10' indicates a case of requesting to increase the rate of high priority data, and the indicator '01' indicates a case of requesting to increase the rate of low priority data, and the indication If the value is '00', the device indicates that there is no data to increase the data rate, and indicates the format information. The method of claim 23, wherein If the indicator is '11', the apparatus indicates that the selected control information is scheduling information.

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