MX2008010030A - Method for transmitting response information in mobile communications system - Google Patents

Abstract

A method for transmitting radio resources in a mobile communication system is disclosed. The method includes receiving a random access channel (RACH) preamble from a plurality of UEs and transmitting response information associated with the received preambles over a common channel wherein the plurality UEs can access the common channel and receive corresponding information. If a HARQ scheme is used when a UE transmits data to the eNode-B using uplink radio resources allocated over the RACH, the eNode-B does not pre-allocate uplink radio resources required for re-transmission and performs allocation of radio resources for a first transmission of HARQ. If the re-transmission is required, the eNode-B allocates the radio resources required for the re-transmission with the NACK signal. If re-transmission is not required, the present invention can reduce an amount of wasted radio resources.

Description

METHOD FOR TRANSMITTING RESPONSE INFORMATION IN A MOBILE COMMUNICATION SYSTEM TECHNICAL FIELD The present invention relates to a mobile communication system and, specifically, to a method for response information in a mobile communication system. BACKGROUND OF THE ART Figure 1 is a structural diagram illustrating a Long Term Evolution (LTE) system which is a mobile communication system. The LTE system is an evolved version of a conventional UMTS system and has been standardized by the 3GPP (Third Generation Partnership Project). The LTE Network can generally be classified into an Evolved UMTS Land Radio Access Network (E-UTRAN) and a Central Network (CN). The E-UTRAN includes at least one eNode-B that serves as a base station and an Access Gateway (AG) that is located at the end of the network in such a way that it is connected to one end of the network. The AG can be classified into a portion to process user traffic and a portion to process control traffic. The portion of AG for processing user traffic and the portion of AG for processing control traffic may be connected to each other through a new interface for communication. There may be one or more cells in a eNode-B The eNode-Bs can be connected through an interface for the transmission of user traffic or control traffic. The CN includes the AG and a node for registering a user of the user equipment (UE). An interface can also be provided in E-UMTS in order to classify the E-UTRAN and the CN. Radio interface protocol layers can be classified into the first layer (Ll), the second layer (R2), and the third layer (L3) based on 3 lower layers of a reference model of Open System Interconnection (OSI) which is well known in the art. A physical layer of the first layer (LI) offers a service of information transfer through a physical channel. A radio resource control layer (RRC) located in the third layer (L3) controls the radio resources between the UE and the network. The RRC layer exchanges RRC messages between the UE and the network for that purpose. The RRC layer can be distributed to several network nodes, for example eNode-B and AG, and can also be found in eNode-B or AG. Figure 2 is a conceptual diagram illustrating a control plane of a radio interface protocol structure between the UE and the UTRAN (U TS Terrestrial Radio Access Network) based on the 3GPT radio access network standard . The radio interface protocol is represented horizontally by a physical layer, a data link layer and a network layer. The radio interface protocol is represented vertically by a user plane for transmitting data and the control plane for transmitting control signals. The protocol layers in Figure 2 can be classified into a physical layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control layer (RRC). ). The physical layer, which is a first layer, provides a service for transferring information to a higher layer through a physical channel. The physical layer is connected to a layer of Medium Access Control (MAC) located up there through a transport channel. The MAC layer communicates with the physical layer through the transport channel in such a way that the data is communicated between the MAC layer and the physical layer. The data is communicated between different physical layers, such as between a first physical layer of a transmission side and a second physical layer of a reception side. The MAC layer of the second layer (L2) transmits several services to the RLC layer (Radio Link Control) which is the upper layer, through a logical channel. The RLC layer of a second layer (L2) supports reliable data transmission.

It will be noted that the RLC layer is illustrated in dotted lines, since if the RLC functions are implemented and performed by the MAC layer, the RLC layer itself does not have to exist. The RRC layer (Radio Resource Control) located in the lower portion of the third layer (L3) is defined only through the control plane. The RRC layer controls the logical channels, transport channels and physical channels for the configuration, reconfiguration and release of Radio Bearers (RBs). An RB indicates a service provided by the second layer (L2) for data transfer between the UE and the E-UTRAN. Figure 3 is a conceptual diagram illustrating a user plane of a radio stage protocol structure between the UE and the UTRAN in accordance with the 3GPP radio access network standard. The user plane of the radio protocol classifies in a physical layer, a MAC layer an RLC layer and a PDCP layer (Data Convergence Protocol in Packet). The physical layer of the first layer (LI) and the MAC and RLC layers of the second layer (L2) are used to transmit, effectively data using an IP packet, such as IPv4 or IPv6, in a radio interface with a relatively narrow bandwidth. The PDCP layer performs a header compression in order to reduce the size of a relatively large IP packet header that contains unnecessary control information. Uplink and downlink channels for transmitting data between the network and the UE will be described in detail below. Downlink channels transmit data from the network to the user equipment. Uplink channels transmit data from the user equipment (UE) to the network. Examples of downlink channels are a Broadcast Channel (BCH) for transmitting system information and a downlink Shared Channel (SCH) and a Shared Control Channel (SCH) for transmitting user traffic or control messages. User traffic or control messages from a downlink multicast service or a broadcast service can be transmitted through the downlink shared channel (SCH) or they can be transmitted through an additional multicast channel (CH) ). Examples of uplink channels are a Random Access Channel (RACH) and an uplink shared channel (SCCH) and a Shared Control Channel (SCH) for transmitting user traffic or control messages. Figure 4 is a conceptual diagram illustrating a Hybrid Automatic Repetition and Request Scheme (HARQ). A method to increase HARQ in the physical link layer descending of a radio packet communication system will be described with reference to Figure 4. With reference to Figure 4, the eNode-B determines a user equipment that should receive packets and the type of packet that must be transmitted to the equipment of user, such as coding speed, modulation scheme, and amount of data. The eNode-B informs the user equipment of the information determined in a High Speed Downlink Shared Control Channel (HS-SCCH) and transmits a corresponding data packet through a High Speed Downlink Shared Channel (HS). -SCH) at a time associated with the transmission of information through the HS-SCCH. The user equipment receives the downlink control channel, identifies a type of packet to be transmitted and a transmission time point, and receives the corresponding packet. The user equipment then attempts to decode the received packet data. The user equipment transmits a negative acknowledgment signal (NACK) to eNode-B if the user equipment can not decode a specific packet, such as datal. The eNode-B recognizes that the packet transmission has failed and retransmits the same data, such as datol using the same packet format or a new packet format at an appropriate time point. The user equipment it combines the retransmitted packet, such as datasl, and a previously received packet for which the packet decoding failed and tries again to code the packet. The user equipment transmits a recognition signal (ACK) to eNode-B if the packet is received and decoded successfully. The eNode-B recognizes the successful transmission of the packet and effects a transmission of the new packet, for example data2. The random access channel (RACH) indicates a channel for transmitting an initial control message from the user equipment to the network. The RACH is adapted to increase synchronization between the user equipment and the network. Furthermore, if there is no more data to transmit on a user equipment that wishes to transmit data in the uplink address, the user equipment can acquire necessary radio resources through RACH. For example, when the user equipment is on, try to access a new cell. The user equipment performs a downlink synchronization and receives system information 'from a target cell desired by the user equipment. Upon receiving the system information, the user equipment (UE) must transmit an access request message to access the RRC layer. However, the user equipment does not it is synchronized with a current network and there is no guarantee of uplink radio resources since it uses the RACH. In other words, the user equipment requests radio resources capable of transmitting the request message for access to the network. If the eNode-B receives the radio resource request signal from the user equipment, it assigns appropriate radio resources to the user equipment to transmit an RRC connection request message. The user equipment may then transmit the RRC connection request message to the networks using the allocated radio resources. In another example, it is considered that an RRC connection is established between the user equipment and the network. The user equipment receives radio resources from the network in accordance with a programming process of radio resources of the network in such a way that the data coming from the user equipment will be transmitted to the network using the radio resources. However, if there is no more data for transmission in a buffer of the user equipment, the network no longer assigns uplink radio resources to the user equipment. If the network assigns the uplink radio resources to the user equipment, this allocation is considered ineffective. The memory status of the computer user is periodically or accidentally reported to the network. Accordingly, if new data is stored in the buffer of the user equipment that does not have radio resources, the user equipment uses RACH since there are no uplink radio resources allocated to the user equipment. In other words, the user equipment requests radio resources required for transmission of data to the network. Next, it will be described with RACH details as it is used in a Multiple Broadband Code Division (WCDMA) access system. The RACH is used for short-length data transmission. Certain RRC messages, such as an RRC reconnect request message, a cell update message, and an URA update message, are transmitted through RACH: Several logical channels can be mapped in the RACH. For example, a common control channel (CCCH), a dedicated control channel DCCH), and a dedicated traffic channel (DTCH) can be mapped to the RACH. The RACH is mapped to a physical random access channel (PRACH). Figure 5 is a conceptual diagram illustrating an example of a PRACH transmission method (Physical Random Access Channel). As illustrated in Figure 5, the PRACH which is a physical uplink channel is divided into a preamble part and a message part.

The preamble part performs a function of gradually increasing power to adjust the power required to transmit a message and an anti-collision function to prevent transmissions from several user equipment colliding with each other. The message part effects the transmission of a MAC Protocol Data Unit (MACPDE) to the physical channel from the MAC layer. If the MAC layer of the user equipment indicates to the physical layer of the user equipment transmitting the PRACH transmission, the physical layer of the user equipment selects a single access segment and a single signature and transmits the PRACH preamble in the uplink . The preamble can be transmitted during an access segment period of 1.33 ms and selects a single signature among 16 signatures during an initial predetermined period of the access segment in such a way that it can transmit the selected signature. When the user equipment transmits the preamble, in eNode-B it can transmit a response signal through an Acquisition Indicator Channel (AICH) which is a physical downlink channel. The eNode-B transmits a positive response (ACK) or a negative response (NACH) to the user equipment using a response signal transmitted through the AICH. If, in user equipment, it receives an ACK response signal, it transmits the message part. If the user equipment receives a NACK response signal, the MAC layer of the user equipment instructs the physical layer of the user equipment to perform a PRACH retransmission after a predetermined time. If the user equipment does not receive a response signal corresponding to the retransmitted preamble, it transmits a new preamble to a power level that is greater than the power level of a previous preamble by a level after a designated access segment. Even though the description mentioned above has disclosed a response signal to the RACH preamble, it will be noted that the eNode-B may transmit data or control signals to the user equipment. There are several control signals transmitted from the eNode-B to the user equipment, for example downlink programming information, uplink programming grant information, and response information associated with the user equipment RACH preamble transmission. . DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM In accordance with the conventional technique, when the user equipment transmits data through the RACH, it transmits the RACH preamble to the eNode-B and the eNode-B transmits response information associated with the RACH preamble to the user equipment. However, if at least two user computers transmit their RACH preambles to use the RACH at the same time or at a similar time, the eNode-B must inform each of the two user teams about the response information associated with the respective preambles, thus requiring the allocation of radio resources to transmit the response information. to each user equipment and wasting radio resources. Provided that the user equipment uses the HARQ scheme when transmitting data to eNode-B using the radio resources allocated through RACH, the eNode-B preassigns not only first radio resources associated with initial transmission data but also second radio resources associated with retransmission data. Accordingly, the second radio resources for retransmission of data are unnecessarily wasted if the user equipment transmits data successfully in a first transmission time. TECHNICAL SOLUTION An object of the present invention is to provide a method for transmitting response information in a mobile communication system that reduces the amount of wasted audio resources and effectively utilizes radio resources. Another object of the present invention is to provide a mobile communication system that does not transmit response information associated with the user equipment separately when two or more user equipment has transmits RACH preambles at the same time or at a similar time, but transmits RACH preamble response information to a specific user equipment, configures the associated response information in the form of a single data unit through a common channel, and transmits the configured data unit to the specific user equipment. In one aspect of the present invention, there is provided a method for transmitting a specific preamble and for receiving information in response to the specific preamble in a mobile communication system. The method includes transmitting a specific preamble in a random access channel (RACH), receiving response information through a common channel, the response information includes at least one response and identification information corresponding to at least one In a response, the at least one response corresponds to the at least one preamble transmitted during a specific time interval and processes the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble. It is contemplated that the method further includes a transmission of data using radio resources allocated in the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble. It is also contemplated that the method it also includes the reception of a first message that includes an indication in the sense that the transmitted data was not correctly received and the retransmission of the data using radio resources recently assigned. It is contemplated that the first message includes the newly assigned radio resources. It is also contemplated that the method also includes the reception of a second message that includes the newly assigned radio resources. Preferably, the common channel is a downlink shared channel (DL-SCH). In another aspect of the present invention, there is provided a method for transmitting a preamble and receiving information in response to the preamble in a mobile communication system. The method includes the reception of at least one preamble in a random access channel (RACH) during a specific time interval and the transmission of a response information through a common channel, the response information includes a corresponding response to at least one preamble received during the specific time interval and identifying information identifying a mobile communication terminal from which the at least preamble was received. It is contemplated that the method also includes the allocation of radio resources in the response, the resources associated with the transmission of data from the terminal of mobile communication from which the at least one preamble was received. It is also contemplated that the method further includes the reception of data from the mobile communication terminal apart from which the at least one preamble was received, the data transmitted using the allocated radio resources, the determination in the sense that the data was not correctly received, the transmission of a first message including additional allocated radio resources associated with the retransmission of the data and the reception of the retransmitted data using radio resources allocated in the message. It is contemplated that the method further includes the inclusion of an indication in the first message in the sense that the data was not correctly received. It is further contemplated that the method further includes the transmission of a second message that includes an identification in the sense that the data was not correctly received. Preferably, which common is a downlink shared channel (DL-SCH). In another aspect of the present invention, there is provided a method for transmitting a specific preamble and receiving information in response to the specific preamble in a mobile communication system. The method includes a specific mobile communication terminal that transmits the specific preamble through a random access channel (RACH), a network that transmits response information through a common channel, the response information includes a response corresponding to the at least one preamble received during a specific time interval and identification information identifying a mobile communication terminal apart from which the at least one preamble was received, the mobile communication terminal specifies that it receives the response information and the specific mobile communication terminal that processes the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble. It is contemplated that the method further includes the network allocating radio resources in the response, the radio resources associated with the transmission of data from the mobile communication terminal from which the at least one preamble was received. It is also contemplated that the method also includes the mobile communication terminal specifying that they transmit data using the radio resources allocated in the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble. It is also contemplated that the method also includes the network that receives data from the mobile communication terminal from which the at least one preamble was received, the data transmitted using the resources of assigned radio, the network that determines that the data was not correctly received, the network that transmits a first message that includes additional radio resources assigned associated with the retransmission of data, the mobile communication terminal specifies that it retransmits the data using the resources of radio assigned in the first message and the network that receives the transmitted data using the radio resources assigned in the message. It is also contemplated that the method also includes the network that includes an indication in the first message in the sense that the data was not correctly received. It is contemplated that the method also includes the network that transmits a second message that includes an indication in the sense that the data was not correctly received. It is also contemplated that the common channel is a downlink shared channel (DL-SCH). Additional features and advantages of the invention will be presented in the following description and will be apparent from the description or may be learned through the practice of the invention. It will be understood that both the foregoing general description and the following detailed description of the present invention are offered by way of example and explanation and are contemplated to provide a further explanation of the claimed invention. These and other modalities will also become easily Apparent to persons with knowledge in the art from the following detailed description of the modalities with reference to the appended Figures, the invention is not limited to any of the particular embodiments disclosed. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings which are included for the purpose of offering a further understanding of the present invention and incorporated in and forming a part of this specification illustrate embodiments of the present invention and together with the description serve to explain the principles of the invention. Characteristics, elements and aspects of the invention referenced by the same numbers in different Figures represent the same characteristics, elements or aspects or characteristics, elements or equivalent or similar aspects in accordance with one or several modalities. Figure 1 is a structural diagram illustrating a Long Term Evolution (LTE) system with a mobile communication system. Figure 2 is a conceptual diagram illustrating each layer of a radio interface protocol control plane. Figure 3 is a conceptual diagram illustrating each layer of a user plane of radio interface protocol. Figure 4 is a conceptual diagram illustrating an outline Hybrid ARQ (HARQ). Figure 5 is a conceptual diagram illustrating an example of a transmission method PRACH (Physical Random Access Channel). Figure 6 is a flow chart illustrating a method for transmitting response information in a mobile communication system in accordance with an embodiment of the present invention. Figure 7 is a conceptual diagram illustrating a method for transmitting information and response to a user equipment through a common channel in accordance with an embodiment of the present invention. Figure 8 is a flow diagram illustrating the method for transmitting response information in a mobile communication system in accordance with another embodiment of the present invention. Figure 9 is a flow diagram illustrating the method for transmitting response information in a mobile communication system in accordance with another embodiment of the present invention. PREFERRED MODE OF THE INVENTION Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. When possible, the same reference numbers will be used in all the drawings to refer to the same parts or similar parts. A method for transmitting response information in a mobile communication system in accordance with the present invention will be described below with reference to the accompanying drawings. For convenience of description and a better understanding of the present invention, the term "UE" (user equipment) will be used to indicate an entity of transmission of an uplink signal and the term "eNode-B" will be used to indicate an entity for receiving the uplink signal. However, it will be noted that the scope of the terminal and the base station is not limited to the terms mentioned above and the term "UE" and the term "eNode-B" may also be used to indicate, respectively, a terminal and a base station. Figure 6 is a flow chart illustrating a method for transmitting response information in a mobile communication system in accordance with an embodiment of the present invention. A method for transmitting response information associated with the preamble transmission of at least one user equipment at a time will be described below. The user equipment (UE) uses RACH to make an RRC connection request, a cell update, a transfer, a request for link radio resources ascending and synchronization maintenance associated with the eNode-B. The user equipment transmits a preamble before the transmission of the data. The preamble uses to adjust the transmission a power required for data transmission and to prevent multiple user equipment from colliding with each other. When RACH is used, the user equipment transmits the RACH preamble to the eNode-B and the eNode-B transmits the RACH preamble response information to the user equipment. The eNode-B does not independently transmit the response information associated with other user equipment, each of which transmits RACH preambles at the same time or at a similar time, but transmits the response information associated with the other user equipment through of a common channel at the same time. For example, if a first user equipment, a second user equipment, and a third user equipment transmit their RACH preambles to the eNode-B within a predetermined period of time, the eNode-B configures the response information associated with it. the first user equipment, second user equipment, and third user equipment in the form of a single data unit and transmits the single data unit to the first user equipment, second user equipment and third user equipment through a common channel in order to respond to the RACH preamble of the first user, second user equipment and third user equipment. As illustrated in Figure 6, the first user equipment (UEl) transmits its RACH preamble to eNode-B in step S60 and the second user equipment (UE2) transmits its RACH preamble to eNode-B at the same time or at a time similar to the transmission of the RACH preamble of the first user equipment. In other words, the first user equipment (UEl) and the second user equipment (UE2) transmit their RACH preamble to the eNode-B at the same time or in a similar time. Accordingly, the eNode-B receives at least one RACH preamble from at least two user equipment for a predetermined time (At). Although Figure 6 illustrates only the first user equipment (UEl) and the second user equipment (UE2), it is evident to persons skilled in the art that the number of user equipment can be N and the present invention is It also applies to N user teams. The eNode-B receives RACH preambles from the first user equipment (UEl) and from the second user equipment (UE2) and transmits response information from the RACH preambles received in step S62. The eNode-B transmits the response information through a common channel without assigning unique RF radio frequencies to the first user equipment (UEl) and the second user equipment (UE2) to answer the preambles of RACH. The common channel allows all user teams within a cell to receive or read data from eNode-B. Figure 7 is a conceptual diagram illustrating a method for transmitting response information to a user equipment through a downlink shared channel (DL-SCH) which is a common channel in accordance with an embodiment of the present invention. In general, the DL-SCH is used to transmit data from eNode-B to predetermined user equipment or is used to transmit data to all user equipment in a cell. Accordingly, different user equipment can receive data through DL-SCH. Even though the eNode-B simultaneously transmits response information associated with various user equipment through the DL-SCH, each user equipment may receive its response information from eNode-B. The eNode-B transmits response information associated with the RACH preambles to the user equipment through the DL-SCH. The single data unit of the response information includes several response information associated with various user equipment. As illustrated in Figure 7, the user equipment must first see the downlink shared control channel (DL-SCCH) in order to read data from the DL-SCH. The location information of the DL-SCH is transmitted through the DL-SCCH. In other words, after transmitting the RACH preamble, the user equipment reads the DL-SCCH to receive the eNode-B response information and then recognizes the location information of the DL-SCH associated with the DL-SCCH. Control signals associated with the physical layer and / or the second layer are transmitted from the eNode-B to the user equipment through the DL-SCCH. The DL-SCCH carries various information, such as, for example, UE ID (identifier) to indicate which user equipment will receive the data, location information related to the frequency or time that indicates which DL-SCH data will be read by the equipment. users, specific information required by the user teams that wish to read them DL-SCH, and decoding information. In this way, it will be possible to recognize which user equipment will receive DL-SCH data specific to the user equipment identifier (UEID) included in DL-SCCH. As illustrated in Figure 6, the DL-SCH carries a first response information for the first user equipment (UEl) and a second response information for the second user equipment (UE2). In other words, the first user equipment (UEl) and the second user equipment (UE2) read the same DL-SCCH and determine the same location of DL-SCH. The first user equipment (UEl) and the second user equipment (UE2) read their unique response information in the same DL-SCH. The response information of the DL-SCH preambles transmitted from the user equipment at the same time or in a similar time transmits to the user equipment by multiplexing each response information for each user equipment in the second layer of the eNode. -B. The eNode-B configures the response information of the RACH preambles that have been transmitted by the user equipment at the same time or in the response information is configured in the form of a single MAC Protocol Data Unit (PDU). A method for multiplexing the response information of the user equipment to configure a single MAC PDU and transmitting the single MACPDU will be described below with reference to Tables 1 and 2. A representative example of a PDU configured by multiplexing response information It is shown in TABLE 1 As illustrated in Table 1, the eNode-B configures a first user equipment (UE ') header before the first user equipment UE' response information. The header includes a user equipment identifier (UEID) that indicates for which user equipment the response information to be read is contemplated and also includes specific information indicating the length of the response information. The eNode-B configures the first user equipment response information (UE ') after the first user equipment header. The response information of the first user equipment includes uplink radio resources allocated to the first user equipment, an identifier within a cell, a temporary identifier of the first user equipment, and a compensation value associated with the synchronization with the user. eNode-B After configuring the first team header of user and first user equipment response information UE ', the eNode-B configures the second user equipment UE' header and the second user equipment UE 'response information. In this way, the PDU generated by including response information from various user equipment in a single response information can be configured. Another example of a single PDU configured by the multiplexing of response information is shown in Table 2. As illustrated in Table 2 a header including the first user equipment identifier UE 'and the length of the response information is Attached to the MAC PDU. The header has the same function as the header function illustrated in Table 1. TABLE 2 The second user equipment UE 'header is attached to the PDU after the first user equipment header. In this way, the PDU includes as many headers as the number (N) of user equipment for which the response information must be included in a single response information. An indication indicating the end of the header is attached to the end of the header. The eNode-B can recognize the start of the response information using this header. Then, the MAC PDU is formed by sequentially attaching the team response information of individual users. The response information of each user equipment includes information of uplink radio resources assigned to each user equipment, an identifier within a cell, a temporary identifier of equipment of user, and a compensation value associated with the synchronization to eNode-B. Each user equipment recognizes its own response information among the various response information that has been multiplexed into the only response information and that has been transmitted through the common channel. Each user equipment transmits data to the eNode-B using uplink radio resources allocated to each user equipment in the response information associated with each preamble of the RACH. Fig. 8 is a flowchart that initiates a method for transmitting response information in a mobile communication system in accordance with another embodiment of the present invention. Specifically, Figure 8 illustrates a programming method for a specific case in which a HARQ (Hybrid ARQ) scheme is used when data is transmitted to the eNode-B. As illustrated in Figure 8, a first user equipment (UE1) transmits its RACH preamble to eNode-B in step S70 and the second user equipment (UE2) transmits its RACH preamble to eNode-B in step S71 in a manner similar to that illustrated in Figure 6. The first user equipment (UE1) and the second user equipment (UE2) receive response information configured in the form of a single data unit through a common channel, such as for example DL-SCH, in step S72. Each user equipment then transmits data to the eNode-B using uplink radio resources allocated to each user equipment in the response information associated with each RACH preamble. It will be noted that Figure 8 illustrates only a transmission / reception process between the second user equipment (UE2) and the eNode-B after receipt of the response information. It is evident to those skilled in the art that the process mentioned above can also be applied to the case in which the first user equipment (UE1) in the same way as for the second user equipment (UE2). After the HARQ scheme is used when each user equipment transmits data to eNode-B using the uplink radio resources allocated through RACH, uplink radio resources for data retransmission are not pre-allocated but are assigned and transmitted to each user equipment with a NACK signal when retransmission of data is required due to an eNode-B decoding failure. The uplink radio resources for data retransmission can be included in the NACK signal. A specific control signal can be used to allocate the uplink radio resources for retransmission to the equipment of user . As illustrated in Figure 8, the second user equipment (UE2) transmits data to the eNode-B in step S73 after receiving the response information from the eNode-B. The second user equipment (UE2) employs a HARQ scheme when transmitting the aforementioned data to eNode-B. The eNode-B informs the user teams of the establishment of the HARQ scheme through system information. The eNode-B receives the data of the second user equipment (UE2) and decodes the received data. If the eNode-B does not decode the data correctly, it transmits a NACK signal to the second user equipment (UE2) to indicate a decoding error in step S74. The eNode-B allocates radio resources required for retransmission of data to the second user equipment (UE2) and transmits information associated with the radio resources allocated with the NACK signal at the same time. In other words, the uplink radio resource allocation information in the response information relates only to the first transmission of the HARQ when the eNode-B transmits RACH preamble response information to the user equipment. For example, if the radio resources required for data transmission after the RACH preamble have a specific value of 100 and the data requires retransmission due to the HARQ operation, the user equipment again requests the radio resources of 100. If the retransmission of data is applied to a case in which the eNode-B allocates uplink resources in accordance with the RACH preamble of user equipment, radio resources of 200 will be assigned to the user equipment. However, when allocating radio resources as RACH preamble response information of user equipment, the eNode-B allocates only the radio resources 100 associated with the first transmission to the user equipment in accordance with the present invention. Then, if retransmission of data is required due to a failure of the transmission of data of a user equipment, the eNode-B additionally assigns not only the NACK signal but also the additional radio resources 100 to the user equipment. The control signal specifying that it includes the radio resource allocation information required for retransmission of data may be transmitted in accordance with the same format as in the case of the RACH preamble response information. Also, a channel used when the eNode-B assigns radio resources to the user equipment can also be used as an example of the present invention. The second user equipment (UE2) retransmits the data in step S75 in accordance with uplink radio resource allocation information transmitted with the NACK signal. Figure 9 is a flow chart illustrating a method for transmitting response information in a mobile communication system in accordance with another embodiment of the present invention. Specifically, Figure 9 illustrates a programming method for a specific case in which a HARQ (hybrid ARQ) scheme is used when data is transmitted to the eNode-B. One of the differences with the case of Figure 8 is that uplink radio resources for data retransmission may not be included in the NACK signal but transmitted separately with the NACK signal at the same time or at another time. As illustrated in Figure 9, a first user equipment (ÜEl) transmits its RACH preamble to eNode-B in step S80 and a second user equipment (UE2) transmits its RACH preamble to eNode-B in step S81 in a manner similar to that illustrated in Figure 6 and Figure 8. The first user equipment (UE1) and a second user equipment (UE2) receive response information configured in the form of a single unit of data through a common channel, such as DL-SCH in step S82. Each user equipment then transmits data to the eNode-B by utilizing upstream radio resources allocated to each user equipment in the response information associated with each RACH preamble in step S83.

It will be noted that Figure 9 illustrates only a process of transmitting / receiving data between the second user equipment (UE2) and the eNode-B after receipt of the response information. It is evident to those skilled in the art that the process mentioned above can also be applied to the first user equipment case (UE1) in the same way as for the second user equipment (UE2). The second user equipment (UE2) employs a HARQ scheme when it transmits the aforementioned data to eNode-B. The eNode-B preferably informs the user equipment of the establishment of the HARQ scheme through the system information. Provided that the HARQ scheme is used when each user equipment transmits eNode-B data by using the uplink radio resources allocated through the RACH, the uplink radio resources for data retransmission are not pre-allocated but they are assigned and transmitted to each user equipment with a NACK signal when data retransmission is required due to an eNode-B decoding failure. A NACK signal transmitted when data is retransmitted is required due to an eNode-B decoding failure in step S84. And the uplink radio resources for data retransmission are assigned. Specifically, the uplink radio resources for data retransmission are not pre-assigned but are assigned and transmitted to each user equipment when a retransmission is necessary. A specific control signal can be used to assign the upstream radio resources for retransmission to the user equipment. The specific control signal may be a signal for SR (resource scheduling) from eNode-B in step S85. The specific control signal may also be a signal for programming information or any other signal. The specific control signal that includes the radio resource allocation information required for retransmission of data may be transmitted in accordance with the same format as in the case of the RACH preamble response information. Also, a channel used when the eNode-B assigns radio resources to the user equipment may also be used as an example of the present invention. The second user equipment (UE2) retransmits the data in step S86 in accordance with an uplink radio resource allocation information that was transmitted with the specific control signal for example, SR. In accordance with what is described herein, the method for transmitting response information in a mobile communication system in accordance with the present invention You can more effectively use radio resources, thereby reducing the amount of wasted radio resources. It will be apparent to those skilled in the art that various modifications and variations may be made in the present invention without departing from the spirit or scope of the inventions. Also, it is contemplated that the present invention encompass the modifications and variations of this invention to conditions that are within the scope of the appended claims and their equivalents. Since the present invention can be incorporated in various forms without departing from the spirit or essential characteristics thereof, it will be understood that the modalities described above are not limited by the details of the foregoing description unless otherwise specified but must be considered broadly within its spirit and scope in accordance with that defined in the appended claims. Accordingly, all changes and modifications that fall within the limits of the claims, or equivalence of such limits, are contemplated within the scope of the appended claims. INDUSTRIAL EXPLOITATION The modalities and advantages mentioned above are merely exemplary and should not be considered as limiting the present invention. The present teaching can be Easily applied to other types of appliances. The description of the following invention is contemplated to illustrate the claims and not to limit its scope. Many alternatives, modifications and variations will be apparent to people with knowledge in the field. In the claims, clauses of meaning plus function are contemplated to encompass the structure described herein by performing the aforementioned function and not only structural equivalents but also equivalent structures.

Claims (19)

1. CLAIMS 1.
2. A method for transmitting a specific preamble and receiving information in response to the specific preamble in a mobile communication system, the method comprises: transmitting the specific preamble through a random access channel (RACH); receiving response information in a common channel, the response information comprises at least one response and identification information corresponding to the at least one response, the at least one response corresponds to the at least one preamble transmitted during a specific time interval; and processing the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble. > The method according to claim 1, further comprising: transmitting data using radio resources allocated in the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble.
3. The method according to claim 2, further comprising: receiving a first message comprising an indication in the sense that the transmitted data was not correctly received; and retransmit the data using recently assigned radio resources.
4. 4. The method according to claim 3, wherein the first message comprises the newly assigned radio resources.
5. The method according to claim 3, further comprising: receiving a second message comprising the newly assigned radio resources.
6. 6. The method according to claim 1, wherein the common channel is a downlink shared channel (DL-SCH).
7. 7. A method for transmitting a preamble and receiving information in response to the preamble in a mobile communication system, the method comprising: receiving at least one preamble through a random access channel (RACH) during a specific time interval; and transmitting response information in a common channel, the response information comprises a response corresponding to at least one preamble received during the specific time interval and identifying information identifying a mobile communication terminal from which received at least one preamble.
8. The method according to claim 7, further comprising: allocating radio resources in the responses, the radio resources are associated with the transmission of data from the mobile communication terminal from which it was received by at least a preamble.
9. The method according to claim 8, further comprising: receiving data from the mobile communication terminal from which the at least one preamble was received, the data is transmitted using the allocated radio resources; determine that the data was not correctly received; transmitting a first message comprising additional allocated radio resources associated with the retransmission of the data; and receive the retransmitted data using the radio resources assigned in the message.
10. The method according to claim 9, further comprising including an indication in the first message in the sense that the data was not correctly received.
11. The method according to claim 9, further comprising: transmit a second message comprising an indication in the sense that the data was not correctly received.
12. 12. The method according to claim 9, wherein the common channel is a downlink shared channel (DL-SCH).
13. 13. A method for transmitting a specific preamble and for receiving information in response to the specific preamble in a mobile communication system, the method comprising: a specific mobile communication terminal that transmits the specific preamble through a random access channel (RACH) ); a network that transmits response information through a common channel, the response information comprises a response corresponding to at least one preamble received during a specific time interval and identification information identifying a mobile communication terminal from which received at least one preamble; the mobile communication terminal specifies that it receives the response information; and the mobile communication terminal specifies that it processes the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble.
14. 14. The method according to claim 13, which it further comprises: the network that allocates radio resources in the response, the radio resources are associated with the transmission of data from the mobile communication terminal from which the at least one preamble was received.
15. The method according to claim 14, further comprising: the mobile communication terminal specifies that it transmits data using the radio resources allocated in the at least one response if the identification information indicates that the at least one response corresponds to the specific preamble.
16. 16. The method according to claim 15, further comprising; the network that receives data from the mobile communication terminal from which the at least one preamble was received, the data is transmitted using the assigned radio resources; the network that determines that the data was not correctly received; the network transmitting a first message comprising additional allocated radio resources associated with the retransmission of the data; the mobile communication terminal specifies that it retransmits the data using the radio resources allocated in the first message; and the network that receives the retransmitted data using the radio resources assigned in the message.
17. The method according to claim 16, further comprising: the network including an indication in the first message in the sense that the data was not correctly received.
18. The method according to claim 16, further comprising: the network transmitting a second message comprising an indication in the sense that the data was not correctly received.
19. 19. The method according to claim 13, wherein the common channel is a downlink shared channel (DL-SCH).