KR101552725B1 - Method of encoding data unit using different crc algorithms - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a terminal for providing a wireless communication service, and more particularly to a wireless communication system for providing a wireless communication service in an evolved universal mobile telecommunications system (E-UMTS) or an LTE system (Long Term Evolution System) (MSG 3) to a base station, a method of performing cyclic redundancy check (Cyclic Redundancy Check) according to the type of data included in the RACH MSG 3, CRC) algorithm to reduce the overhead of a MAC PDU (Medium Access Control Protocol Data Unit) included in the RACH MSG 3, thereby increasing the efficiency of data transmission.

Wireless communication, terminal, RACH, LTE

Description

[0001] METHOD OF ENCODING DATA UNIT USING DIFFERENT CRC ALGORITHMS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a terminal for providing a wireless communication service, and more particularly to a wireless communication system for providing a wireless communication service in an evolved universal mobile telecommunications system (E-UMTS) or an LTE system (Long Term Evolution System) (MSG 3) to a base station, a method of performing cyclic redundancy check (Cyclic Redundancy Check) according to the type of data included in the RACH MSG 3, CRC) algorithm to reduce the overhead of a MAC PDU (Medium Access Control Protocol Data Unit) included in the RACH MSG 3, thereby increasing the efficiency of data transmission.

1 is a diagram illustrating a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS), which is a conventional mobile communication system to which the present invention is applied.

The E-UMTS system evolved from the existing UMTS system and is currently undergoing basic standardization work in 3GPP. The E-UMTS system may be referred to as an LTE (Long Term Evolution) system.

The E-UMTS network can be divided into E-UTRAN and CN. The E-UTRAN includes a User Equipment (hereinafter abbreviated as UE), a base station (abbreviated as eNode B hereinafter), a Serving Gateway (abbreviated as S-GW hereinafter) And a Mobility Management Entity (hereinafter abbreviated as MME) for managing the mobility of the mobile terminal. One eNode B may have more than one cell.

2 and 3 illustrate a structure of a radio interface protocol between a terminal and a base station based on the 3GPP radio access network standard. The wireless interface protocol horizontally comprises a physical layer, a data link layer, and a network layer, and vertically includes a user plane for data information transmission and a control plane And a control plane for signal transmission. The protocol layers are classified into L1 (first layer), L2 (second layer) and L3 (third layer) based on the lower three layers of the Open System Interconnection (OSI) .

Hereinafter, each layer of the wireless protocol control plane of FIG. 2 and the wireless protocol user plane of FIG. 3 will be described.

The physical layer as the first layer provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control layer (upper layer) through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Data is transferred between the different physical layers, that is, between the transmitting side and the receiving side physical layer through the physical channel.

The Medium Access Control (MAC) of the second layer provides a service to a radio link control layer that is an upper layer through a logical channel. The second layer of Radio Link Control (RLC) layer supports the transmission of reliable data. The PDCP layer of the second layer is a header compression that reduces the IP packet header size, which is relatively large and contains unnecessary control information, in order to efficiently transmit the IP packet, such as IPv4 or IPv6, Compression function. The PDCP layer is also used to perform encryption of C-plane data, for example, an RRC message. PDCP also encrypts U-plane data.

The radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane and is configured to perform a configuration of a radio bearer (RB) -configuration and release of the logical channel, the transport channel, and the physical channel. At this time, the RB means a service provided by the second layer for data transmission between the UE and the E-UTRAN.

Hereinafter, RACH (Random Access Channel) will be described in detail. The RACH channel is used to transmit data of a short length upstream, and is used when there is a signaling message or user data that a UE that has not been allocated a dedicated radio resource should transmit upward. Or, the BS may be used when it instructs the UE to perform the RACH process.

The following is a description of a random access procedure provided by the LTE system. The random access procedure provided by the LTE system is divided into a contention based random access procedure and a non-contention based random access procedure. The division between the contention-based random access procedure and the contention-based random access procedure is determined according to whether the terminal directly selects a random access preamble used in the random access procedure or whether the base station selects the random access preamble.

In the non-contention-based random access procedure, the UE uses a random access preamble that the BS directly assigns to itself. Therefore, when the BS only allocates the specific random access preamble to the MS, the random access preamble is used only by the MS, and the MS does not use the random access preamble. Therefore, since a 1: 1 relationship is established between the random access preamble and the terminal using the random access preamble, it can be said that there is no collision. In this case, as soon as the base station receives the random access preamble, it can know the terminal that transmitted the random access preamble, which is efficient.

On the contrary, in the contention-based random access procedure, randomly selected and transmitted random access preambles available for the UE may be used, so that there is a possibility that a plurality of UEs always use the same random access preamble. Therefore, even if the base station receives a specific random access preamble, it can not know which terminal transmitted the random access preamble.

In general, a UE can perform a random access procedure in the following cases. 2) the UE initially accesses the target cell during the handover process; 3) when the UE is requested by an instruction from the base station; and 4) when the UE makes initial access without connection with the base station (RRC Connection) 5) When data is generated in the uplink in a situation where the time synchronization of the uplink does not match or a designated radio resource used for requesting radio resources is not allocated 5) Radio link failure or handover In the case of a recovery process in case of a handover failure.

Based on the above description, FIG. 4 shows an operation procedure of the UE and the BS in the contention-based random access procedure.

First, in a contention-based random access, a UE randomly selects one random access preamble from a set of random access preambles indicated through system information or a handover command, and transmits the random access preamble Selects a PRACH resource and transmits it to the base station. (Step 1) The preamble at this time is called RACH MSG 1.

After the UE transmits the random access preamble as described above, the UE attempts to receive a response to its random access preamble in the random access response reception window indicated by the system information or the handover command (step 2). More specifically, the random access response information is transmitted in the form of a MAC PDU, and the MAC PDU may be delivered to a Physical Downlink Shared Channel (PDSCH). In addition, a Physical Downlink Control Channel (PDCCH) is also transmitted together with the PDSCH to properly receive the information transmitted on the PDSCH. That is, the PDCCH may include information of a UE receiving the PDSCH, frequency and time information of the PDSCH, and a transmission format of the PDSCH. Here, if the UE succeeds in receiving the PDCCH coming to the UE itself, the UE properly receives a random access response transmitted on the PDSCH according to the information of the PDCCH. The random access response includes a random access preamble identifier (ID), a UL Grant (uplink radio resource), a Temporary C-RNTI (temporary cell identifier), and a Time Alignment Command (time synchronization correction value). The reason why the random access preamble separator is necessary is that random access response information for one or more UEs can be included in one random access response. Therefore, it is possible to determine to which UE the UL Grant, Temporary C-RNTI and Time Alignment Command information is valid It is to inform. The random access preamble identifier corresponds to the random access preamble selected in step 1 by itself.

Herein, when the UE receives a random access response, the UE processes the information included in the random access response. That is, the UE applies Time Alignment Command and stores a Temporary C-RNTI. In addition, using UL Grant, data stored in the buffer of the UE or newly generated data is transmitted to the BS (step 3). At this time, the identifier of the UE must be included in the data included in the UL Grant (hereinafter referred to as message 3). This is because, in the contention-based random access procedure, the base station can not determine which UEs perform the random access procedure, and it is necessary to identify the UE in order to resolve the collision later. Here, there are two methods of including the identifier of the terminal. In the first method, if the UE has a valid cell identifier already allocated in the corresponding cell before the random access procedure, the UE transmits its cell identifier through the UL Grant. On the other hand, if a valid cell identifier is not allocated before the random access procedure, the UE transmits its own unique identifier (e.g., S-TMSI or Random Id). In general, the unique identifier is longer than the cell identifier. In step 3, if the UE transmits data through the UL Grant, the UE starts a contention resolution timer for a conflict resolution.

After the UE transmits data including its own identifier through the UL Grant included in the random access response, the UE waits for an instruction from the BS to resolve the conflict. That is, the PDCCH is attempted to receive a specific message (step 4). There are two methods of receiving the PDCCH. As described above, when the UE's own identifier transmitted through the UL Grant is a cell identifier, it attempts to receive the PDCCH using its cell identifier. If the identifier is a unique identifier, And attempts to receive the PDCCH using the Temporary C-RNTI. Thereafter, in the former case, if the PDCCH (hereinafter referred to as message 4) is received through its cell identifier before the collision resolution timer expires, the UE determines that the random access procedure is normally performed, The access process is terminated. In the latter case, if the PDCCH is received through the temporary cell identifier before the collision resolution timer expires, data (hereinafter referred to as message 4) transmitted by the PDSCH indicated by the PDCCH is checked. If the unique identifier is included in the contents of the data, the terminal normally determines that the random access procedure has been performed and terminates the random access procedure. Here, the message or MAC PDU received in the fourth step is often referred to as RACH MSG 4.

The following describes a method in which the UE receives downlink data in the LTE system. 5 is an exemplary diagram illustrating radio resource allocation according to the prior art.

In the downward direction, the physical channels are divided into two types: Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). The PDCCH is not directly related to the transmission of the user data, and control information necessary for operating the physical channel is transmitted. In the simplest case, the PDCCH may be used to control other physical channels. In particular, the PDCCH is used for transmission of information necessary for the UE to receive the PDSCH. At a certain point in time, information such as which data is transmitted using a specific frequency band, which terminal, what size of data is transmitted, and the like is transmitted through the PDCCH. Accordingly, each UE receives a PDCCH in a specific TTI, checks whether data to be received is to be transmitted through the PDCCH, and if it is notified that data to be received is to be transmitted, And further receives PDSCH using information such as frequency. PDSCH data is transmitted to a terminal (one or a plurality of terminals), and information on how to receive and decode PDSCH data is transmitted through a Physical Downlink Control Channel (PDCCH) As shown in FIG.

For example, in a specific subframe, radio resource information (e.g., frequency position) A and transmission format information B (e.g., transport block size, modulation and coding information) It is masked by CRC with a temporary identity and is transmitted through PDCCH. One or more UEs in the corresponding cell monitor the PDCCH using RNTI information of its own. In the above assumption, a CRC error is generated when the UE decodes the PDCCH with an RNTI of C . Accordingly, the UE receives the data by decoding the PDSCH using the B format transmission format information and the A radio resource information. On the other hand, in the above assumption, in a terminal that does not have an RNTI of C, a CRC error occurs when the PDCCH is decoded. Therefore, the UE does not receive the PDSCH.

In this process, a Radio Network Temporary Identifier (RNTI) is transmitted in order to inform which UEs the radio resources are allocated through each PDCCH. The RNTI includes a dedicated RNTI and a common RNTI. A dedicated RNTI is allocated to one terminal and is used for transmission and reception of data corresponding to the terminal. The dedicated RNTI is allocated only to a terminal in which information is registered in the base station. On the contrary, the common RNTI is used when the UEs whose information is not registered in the base station and have not been assigned a dedicated RNTI exchange data with the base station, or when they transmit information commonly applied to a plurality of UEs, such as system information.

First, a structure of a Medium Access Control Protocol Data Unit (MAC PDU) used in a MAC entity will be described. FIG. 6 shows a format of a MAC PDU used in a MAC entity. In FIG. 6, the LCID indicates to which logical channel the corresponding MAC SDU corresponds, and the L field indicates the size of the corresponding MAC SDU. The E field also indicates whether additional headers are present. If the size of the corresponding MAC SDU or MAC Control Element is equal to or smaller than 127, the 7-bit L field illustrated in FIG. 7 is used. If the size of the corresponding MAC SDU or MAC Control Element is 127 If larger, a 15-bit L field is used. For the MAC Control Element whose MAC subheader or size is fixed for the MAC SDU included in the MAC PDU, a MAC sub-header of the format shown in Fig. 7B is used, and the other sub- , A MAC sub-header of the format shown in Fig. 7 (a) is used

The following is a more detailed description of each field used in FIG.

- LCID: This indicates which logical channel data the corresponding MAC SDU is or which MAC Control Element (MAC) contains the information.

- E: This MAC sub-header is followed by another MAC sub-header.

- F: Tells the length of the following L field.

- R: reserved bit, unused bit.

Here, information on the values used in the LCID can be represented by the following table.

In general, a terminal that has failed to establish an RRC connection must establish an RRC connection with the base station when a call is initiated. At this time, the UE performs the RACH process. In addition, when a UE having an RRC connection has no uplink radio resource allocated thereto, it must perform a RACH process when data to be transmitted is uplinked. In both of the above cases, the UE constructs a MAC PDU of a size based on the information included in the random access response received in the second step of the RACH process, and transmits the MAC PDU to the BS using the radio resource indicated by the information. MAC PDU. At this time, the total amount of data that can be transmitted in the up direction of the UE, that is, the size of the MAC PDU is approximately 56 bits.

The RRC message transmitted first by the UE in the state in which the RRC connection can not be established is an RRC Connection Request Message (RRC Connection Request Message), which is approximately 56 bits in size. The RRC message is delivered to the MAC layer via the RLC layer in the form of a MAC SDU. To construct the MAC PDU, a MAC header and a MAC SDU are required. The minimum size of the MAC header is 8 bits considering only one MAC subheader. Therefore, if the MAC PDU including only the RRC connection request message is configured, it is at least 64 bits, which is larger than the size of the message that can be sent in the third step of the RACH process.

On the other hand, the message transmitted by the UE having the RRC connection to request allocation of the radio resource to the BS is the Buffer Status Report (BSR). There are two types of Buffer Status Report (BSR), of which the largest is 32 bits including the MAC Subheader. Also, at this time, the UE must send its information to the BS, which is a MAC C-RNTI CE (Control Element), which includes a MAC subheader and is 24 bits. Therefore, the size of the MAC PDU constituted in this case is 56 bits, which can be transmitted in the third step in the RACH process.

In order to send an RRC connection request message in the third stage of the RACH process, it is necessary to 1) increase the size of the MAC PDUs that can be sent in the third step of the RACH process, and 2) reduce the size of the RRC connection request message. If the size of the MAC PDU that can be transmitted in the third step of the RACH process is increased to 64 bits, the UE in the RRC connection state should unnecessarily include 8 bits in the MAC PDU.

In addition, if the size of the RRC connection request message is reduced, the UE must perform another RACH process and send the remaining information, thereby increasing the time required to establish the RRC connection. If the RRC connection request message is included in the MAC PDU, if the MAC PDU is not included, the MAC PDU can be configured according to the limit of 56 bits. However, when the receiving side receives the MAC PDU, There is a problem that the MAC PDU does not know whether the RRC connection request message is included or the Buffer Status Report (BSR) is included.

Therefore, the present invention proposes a method of increasing the efficiency of data transmission in the process of exchanging data between a base station and a mobile station.

In order to achieve the above object, there is provided a method of communicating data on a wireless communication system, comprising: receiving at least one data from an upper layer; Selecting one error checking function from error-checking functions configured according to the received at least one data; Processing the received at least one data using the selected error checking function; And transmitting the processed data.

Preferably, the upper layer is a Medium Access Control (MAC) layer or a Radio Link Control (RLC) layer.

Preferably, the at least one data is a Medium Access Control Protocol Data Unit (PDU) or a Radio Link Control Protocol Data Unit (RLC PDU).

Preferably, the error checking function is a CRC (Cyclic Redundancy Check) function.

Advantageously, the error checking function is selected according to a data format of the received at least one data.

Advantageously, the error checking function is selected according to a receiving channel of the received at least one data.

Advantageously, said received at least one data is processed by applying said selected error checking function to said received at least one data.

According to another aspect of the present invention, there is provided a method of communicating data on a wireless communication system, the method comprising: receiving at least one data; Processing the received at least one data using all error checking functions in configured error-checking functions; Determining which error checking function has been successfully performed for the received at least one data; And decrypting the received at least one data using the configuration related to the determined error checking function.

Preferably, the error checking function is a CRC (Cyclic Redundancy Check) function.

Advantageously, the determining step is performed by a physical layer of the network.

Advantageously, the decoding step is performed by a MAC (Medium Access Control) layer of the network.

According to another aspect of the present invention, there is provided a method of communicating data on a wireless communication system, the method comprising: receiving at least one data from an upper layer; Selecting a preamble according to the received at least one data; Transmitting the selected preamble; Receiving a response message in response to the selected preamble, the response message including an allocated radio resource for a next scheduled data transmission, and using the configuration associated with the selected preamble to transmit the next scheduled data To the mobile station.

Advantageously, the preamble is a random access channel (RACH) preamble.

Preferably, the configuration is used for generating a MAC PDU (Medium Access Control Protocol Data Unit).

Preferably, the Medium Access Control Protocol Data Unit (MAC PDU) is generated with or without a header.

In the present invention, when the MS transmits the RACH message 3 (MSG 3) to the base station, RACH MSG 3 is transmitted by applying different CRC algorithms according to the type of data included in the RACH MSG 3, The overhead of the included MAC PDU is reduced, thereby increasing the efficiency of data transmission.

The present invention is applied to 3GPP communication technology, in particular Universal Mobile Telecommunications System (UMTS) system, communication device and communication method. However, the present invention is not limited thereto and may be applied to all wired / wireless communication to which the technical idea of the present invention can be applied.

A basic concept of the present invention is a method of communicating data on a wireless communication system, comprising: receiving at least one data from a higher layer; Selecting one error checking function from error-checking functions configured according to the received at least one data; Processing the received at least one data using the selected error checking function; And transmitting the processed data. The present invention proposes a method of communicating data on a wireless communication system, and proposes a wireless mobile communication terminal and a wireless network capable of performing such a method.

Also disclosed is a method of communicating data on a wireless communication system, the method comprising: receiving at least one data; Processing the received at least one data using all error checking functions in configured error-checking functions; Determining which error checking function has been successfully performed for the received at least one data; And decrypting the received at least one data using a configuration related to the determined error checking function. The method for communicating data on a wireless communication system, A wireless mobile communication terminal and a wireless network.

A method of communicating data on a wireless communication system, the method comprising: receiving at least one data from an upper layer; Selecting a preamble according to the received at least one data; Transmitting the selected preamble; Receiving a response message in response to the selected preamble, the response message including an allocated radio resource for a next scheduled data transmission, and using the configuration associated with the selected preamble to transmit the next scheduled data And a wireless mobile communication terminal and a wireless network capable of performing such a method are proposed.

First, the present invention proposes a method of effectively notifying a receiving side of the contents or type of a data block to be transmitted by the transmitting side without using additional radio resources, thereby effectively processing a data block (or a data unit) I want to implement it. More specifically, the present invention provides a method for allowing a receiver to know the contents or type of a data block included in the MAC PDU without using information included in a MAC PDU (Medium Access Control Protocol Data Unit) I want to present it.

To this end, the present invention proposes that the transmitting side applies different processing according to the characteristics of data to be transmitted. In addition, the receiving side applies different processing to the received data block, and then, according to the result, recognizes the characteristics of the received data block and proposes to process the received data block accordingly. In the above process, the characteristic of the data to be transmitted is that, in constructing the data block to be transmitted by the transmitting side, the type of the data included in the data block, the data received from the certain logical channel, Is data received from the upper layer. In addition, the data block to be transmitted in the above process means a Medium Access Control Protocol Data Unit (PDU), a Transport Block (TB), or a PDU (Protocol Data Unit). In addition, the type of data included in the data block in the above process includes whether the data is a control message or user data, whether the data is an RRC message, whether the data is a CCCH message, MAC Control Element (CE).

In addition, in the above procedure, whether data received from a certain logical channel is data received from a common control channel or data received from a dedicated control channel, Whether or not data received from a channel (Dedicated Traffic Channel), data received from a common control channel (Common Traffic Channel), data received from a system information channel (Broadcast Control Channel), or data received from a Multimedia Broadcast Control Channel Channel, or data received from a multimedia broadcast traffic channel (MBMS Traffic Channel). The data received from the upper layer in the above process means that when the transmitter composes and transmits a data block, the data included in the data block is the data received from the upper layer, . Also, in the above process, the data created by the user himself / herself means a control message which is constructed by himself / herself. Also, in the above process, the control message that is directly configured by itself means a MAC Control Element.

In addition, in the above process, different processing means that different CRC algorithms are applied. That is, the result obtained by using different CRC algorithms is applied to the data block and transmitted. Alternatively, different processing means that different parity algorithms are applied. That is, the result obtained by using different parity algorithms is applied to the data block and transmitted. Alternatively, different processing methods mean that different security algorithms are applied. That is, the result obtained by using different security algorithms is applied to the data block and transmitted. Alternatively, different processing methods mean that different robust algorithms are applied. That is, the result obtained by using different robust algorithms is applied to the data block and transmitted. In this case, the robust algorithm means a method of determining whether or not there is an error in the data block.

To illustrate the above processes in more detail, the following examples are given. First, assume that a processing method A and a processing method B are set on the transmission side. In addition, it is assumed that the processing method A is used for processing data having a characteristic of C, and the processing method B is used for a method of processing data having a characteristic of D. In this case, the transmitting side grasps the characteristics of the data included in the data block each time a data block is transmitted, determines a processing method to be applied thereto, and applies the determined processing method to the data block. For example, if the data block to be transmitted includes data of characteristic C, the transmitting side applies the processing method A to transmit the data block. For example, if the data block to be transmitted includes data of characteristic B, the transmitting side applies the processing method D to transmit the data block.

The different processing methods in the above process means that different parameters are used depending on the characteristics of the data. Alternatively, different processing means that different parameters are used for the use of the CRC value depending on the characteristics of the data. Alternatively, different processing means that different CRC masking is used depending on the characteristics of the data.

For example, different parameters may be used for the calculation of the CRC, different RNTI (Radio Temporary Network Identity) may be used, or different RNTI may be used for the CRC algorithm or the like depending on the characteristics of the data.

In the above process, different processing methods are applied to the data blocks received by the receiving side, and processing according to the result is that the receiving side applies all the processing methods that have been set to the received data blocks, Means checking the characteristics of the data block associated with the processing method and processing the received data block accordingly.

More specifically, it is assumed that the processing method A and the processing method B are set on the receiving side. In addition, it is assumed that the processing method A is used for processing data having a characteristic of C, and the processing method B is used for a method of processing data having a characteristic of D. In this case, the receiving side applies processing method A and processing method B every time a data block is received. At this time, the receiving side confirms the processing method that has been successfully terminated among the above processing methods. For example, if the processing method A is successfully completed for the received data block, the terminal assumes that the data block contains data having the characteristic C and performs additional processing. For example, if the processing method B is successfully completed for the received data block, the terminal assumes that the data block includes data having the characteristic D and performs additional processing.

Hereinafter, configurations and operations of embodiments according to the present invention will be described with reference to the accompanying drawings.

8 is an exemplary diagram illustrating an operation of encoding or decoding a data unit using a plurality of CRC formulas according to the present invention. In the above example, it is assumed that there are two types of data and two kinds of CRC formulas (algorithm). In the above example, it is assumed that CRC formula 1 is used for transmission of data transmitted through a CCCH (Channel Control Channel), and CRC Formula 2 is used for transmission of data outside a CCCH channel. In the above example, when transmitting the MAC PDU, the transmitting side checks whether the data included in the MAC PDU is CCCH or not, and if the CCCH data is included, applies the CRC formula 1 to the MAC PDU and transmits the data. In the above example, when transmitting and receiving the MAC PDU, the transmitting side checks whether the data included in the MAC PDU is CCCH or not, and if the CCCH data is not included, applies the CRC formula 2 to the MAC PDU and transmits . In the example above, the receiver applies both CRC Formula 1 and CRC Formula 2 for the received data block, and checks which CRC success occurs. If the CRC check is successfully completed in the CRC formula 1, the receiver concludes that the data block, i.e., the MAC PDU contains data of the CCCH and processes the MAC PDU. If the CRC check is successfully completed in the CRC formula 2, the receiver concludes that the data block, i.e., the MAC PDU does not contain data of the CCCH, and processes the MAC PDU.

In the above process, the CRC formula means an algorithm or a hash function for generating a CRC value. In the example of FIG. 8, Equations 1 and 2 use the same CRC algorithm, but may be implemented using input values, for example, different RNTIs. Also, if the type or characteristic of the data is confirmed, the receiver can reassemble the MAC PDU according to the MAC PDU structure. For example, when the CCCH is included in the MAC PDU, the MAC PDU is reassembled without including the MAC subheader. If other data other than the CCCH is included in the MAC PDU, Can be reassembled. Therefore, the transmitting side and the receiving side may use different MAC PDU structures depending on data characteristics.

The present invention also proposes to distinguish the RACH access preamble by another method that can solve the above-described problem. That is, when transmission of a CCCH message or a specific message is required, the UE selects and transmits a specific preamble group. In this case, when the BS receives a preamble belonging to the specific preamble group, the BS allocates more bits to the preamble. FIG. 9 is a diagram illustrating a method of setting a specific message or data of a specific channel according to an embodiment of the present invention by setting a random access preamble group for each group. As shown in FIG. 9, the UE selects a preamble group according to whether the message to be transmitted is a CCCH message, and transmits one of the preamble groups. That is, the present invention sets up a separate random access preamble group for transmission of a specific message or data of a specific channel, and when the terminal needs to transmit data or a specific message of the specific channel, . In this case, the base station can inform the UE of information on a specific channel, a specific message, and a specific preamble group.

Hereinafter, a terminal according to the present invention will be described.

A terminal according to the present invention includes all types of terminals capable of using a service for exchanging data with each other over wireless. That is, the terminal according to the present invention may be a mobile communication terminal (e.g., a UE, a mobile phone, a cellular phone, a DMB phone, a DVB-H phone, a PDA phone, a PTT phone, And laptops, laptop computers, digital TVs, GPS navigation, portable gaming devices, MP3 and other consumer electronics, and the like.

The terminal according to the present invention may include a basic hardware configuration (a transmission / reception unit, a processing unit or a control unit, a storage unit, and the like) required to perform functions and operations for receiving system information as exemplified by the present invention.

The method according to the present invention described so far can be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention can be stored in a storage medium (e.g., a mobile terminal or a base station's internal memory, flash memory, hard disk, etc.) Lt; / RTI > may be implemented as codes or instructions within a software program that may be executed by a processor (e.g., an internal microprocessor).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present invention . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1 is a network structure of an E-UTRAN which is a conventional mobile communication system to which the present invention is applied.

2 is an exemplary diagram illustrating a control plane structure of a wireless interface protocol between a terminal and an E-UTRAN in the prior art.

3 is an exemplary diagram illustrating a user plane structure of a wireless interface protocol between a terminal and an E-UTRAN in the prior art.

4 is an exemplary diagram illustrating a contention-based random access procedure.

5 is an exemplary diagram illustrating radio resource allocation according to the prior art.

6 is an exemplary diagram showing a format of a PDU (Protocol Data Unit) used in an MAC (Medium Access Control) entity.

7A and 7B are diagrams illustrating MAC subheader formats used in a Medium Access Control (MAC) entity.

8 is an exemplary diagram illustrating an operation of encoding or decoding a data unit using a plurality of CRC formulas in accordance with the present invention.

9 is a diagram illustrating a method of setting a specific message or data of a specific channel according to an embodiment of the present invention by setting a random access preamble group for each group.

Claims (15)

A method for transmitting data in a wireless communication system, Receiving a Radio Resource Control (RRC) Connection Request message through a Radio Link Control (RLC) layer to a Medium Access Control (MAC) layer through a common control channel (CCCH) or a dedicated control channel (DCCH); Selecting a random access preamble from a specific random access preamble group based on the received RRC connection request message and transmitting the random access preamble to a network; Receiving a response message for the transmitted random access preamble; And And transmitting scheduling data using the radio resource included in the response message,  Wherein the scheduled data comprises a MAC PDU (Medium Access Control Protocol Data Unit) When the RRC connection request message is received on the CCCH, a first CRC (Cyclic Redundancy Check) code is applied to a MAC PDU not including a MAC header to transmit the scheduled data, and the RRC connection request message is transmitted to the DCCH The second CRC code is applied to the MAC PDU including the MAC header to transmit the scheduled data. delete The method of claim 1, wherein the RRC connection request message is received in the form of a Medium Access Control Service Data Unit (MAC SDU). A terminal for transmitting data in a wireless communication system, And a processor coupled to the memory and the memory, Receives a Radio Resource Control (RRC) connection request message through a CCCH or a DCCH (Dedicated Control Channel) to a Medium Access Control (MAC) layer via an RLC (Radio Link Control) layer, Selects a random access preamble from a specific random access preamble group based on the received RRC connection request message, and transmits the selected random access preamble to the network, Receiving a response message for the transmitted random access preamble, Transmitting scheduling data using radio resources included in the response message, Wherein the scheduled data comprises a MAC PDU (Medium Access Control Protocol Data Unit) When the RRC connection request message is received on the CCCH, a first CRC (Cyclic Redundancy Check) code is applied to a MAC PDU not including a MAC header to transmit the scheduled data, and the RRC connection request message is transmitted to the DCCH The second CRC code is applied to the MAC PDU including the MAC header to transmit the scheduled data. delete delete delete delete delete delete delete delete delete delete delete

Images