Data transmission method and user equipment for the same

DESCRIPTION

Data transmission method and user equipment for it

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a technology for mobile communications and, more specifically, to a method for the efficient transmission of data stored in a temporary message memory 3 (Msg3) and a user equipment for it.

Explanation of related technique

As an example of a mobile communications system to which the present invention is applicable, a long-term evolution communication system of the 3rd generation partnership project (3GPP LTE - 3rd Generation Partnership Project Long Term Evolution) will be schematically described. ). 3GPP TS 36.321 U 8.2.O describes techniques for transmitting data stored in a temporary message memory 3, Msg3.

Figure 1 is a schematic view showing the network architecture of an Evolved Universal Mobile Telecommunication System (E-UMTS) as an example of a mobile communications system.

The E-UMTS is evolved from the existing UMTS, and has now been standardized in the 3GPP. Generally, the E-UMTS can be called the LTE system.

An E-UMTS network can be very divided into an evolved UMTS terrestrial radio access network (E-UTRAN - Evolved UMTS Terrestrial Radio Access Network, in English) 101 and a Core Network (CN - Core Network, in English ) 102. The E-UTRAN 101 may include a user equipment (UE) 103, a base station (hereinafter referred to as "eNode B" or "eNB") 104, and a Door access link (AG) 105, located at the end of a network and connected to an external network. The AG 105 may be divided into a portion for the processing of user traffic and a portion for the processing of control traffic. At this time, an AG for the processing of new user traffic and an AG for the processing of control traffic can communicate with each other using a new interface.

There may be one or more cells in an eNode B. A plurality of eNode B may be connected via an interface to transmit user traffic or control traffic. The CN 102 may include the AG 105 and a node to register a user of the UE 103. An interface can be used to distinguish between the E-UTRAN 101 and the CN 102.

The radio interface protocol layers between the UE and the network can be classified into a first layer L1, a second layer L2 and a third layer L3, based on three lower layers of a reference model of Open System Interconnection (OSI - Open System Interconnection, in English) which is widely known in the communication systems sector. A physical layer that belongs to the first layer provides an information transfer service that uses a physical channel. A Radio Resource Control (RRC) layer belonging to the third layer serves to control the radio resources between the UE and the network. The UE and the network exchange an RRC message through the RRC layer. The RRC layer can be distributed and located in network nodes of eNode B 104 and AG 105. Alternatively, the RRC layer may be located only at eNode B 104 or AG 105.

Figures 2 and 3 show the structures of the radio interface protocols between the UE and the UTRAN based on a 3GPP radio access network standard.

The radio interface protocols of Figures 2 and 3 are formed horizontally of a physical layer, a data link layer and a network layer. The radio interface protocols are vertically formed from a user plane to transmit data information and a control plane to transmit control signals. In detail, Figure 2 shows the layers of a radio protocol control plane, and Figure 3 shows the layers of a radio protocol user plane. The protocol layers of Figures 2 and 3 can be divided into a first layer (L1), a second layer (L2) and a third layer (L3) based on three lower layers of an OSI reference model that is widely known in the communication systems sector.

Next, in this report, the layers of the control plane of the radio protocol of Figure 2 and the user plane of the radio protocol of Figure 3 will be described.

A physical layer (PHY - Physical) of the first layer provides an information transfer service to a higher layer using a physical channel. The PhY layer is connected to an upper layer, such as a Medium Access Control (MAC) layer, through a transport channel. Data is transferred between the MAC layer and the PHY layer through the transport channel. At this time, the transport channel is very divided into a specific transport channel and a common transport channel, depending on whether a channel is shared or not. Data is also transferred between different PHY layers, such as a physical layer of a transmission side and a physical layer of a reception side, through a physical channel using radio resources.

There are several layers in the second layer. First, the MAC layer serves to map several logical channels to several transport channels, and serves to multiplex several logical channels in a transport channel. The MAC layer is connected to a Radio Link Control (RLC) layer, which is an upper layer, through the logical channel. The logical channel can be very divided into a control channel, to transmit information about the control plane, and a traffic channel, to transmit information about the user plane, according to the types of information transmitted.

The RLC layer of the second layer serves to segment and concatenate the data received from an upper layer to adjust the size of the data, such that a physical layer transmits data in a radio section. In addition, the RLC provides three modes, namely a Transparent Mode (TM - Transparent Mode, in English), a Non-Acknowledgment Mode (UM - Unacknowledged, in English) and an Acknowledgment Mode (AM - Acknowledged) Mode, in English) to guarantee various Quality of Service (QoS) requested by Radio Bearers (RB - Radio Bearers, in English). Specifically, the Am RLC performs a retransmission function using an Automatic Repeat and Request function (ARQ) for reliable data transmission.

A Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce the size of an Internet Protocol (IP) packet header. , in English) that includes unnecessary control information and is relatively large in size, for effective transmission in a radio section that has a relatively small bandwidth when an IP packet such as an IPv4 packet or an IPv6 packet is transmitted. Therefore, only necessary information is transmitted in a data header portion, in order to improve the transmission efficiency of the radio section. In the LTE system, the PDCP layer also performs a security function, which includes encryption to prevent the interception of data by a third party, and integrity protection to prevent data from being handled by a third party.

A Radio Resource Control (RRC) located in an upper portion of a third layer is defined only in the control plane. The RRC layer handles logical channels, transport channels and physical channels for the configuration, reconfiguration and release of several RBs. In this report, the RBs refer to logical paths provided by the first and second layers of the radio protocol, for the transfer of data between the UE and the UTRAN, and the configuration of the RBs refers to a process of defining the characteristics of the radio protocol layer and channel, necessary to provide a specific service, and establish detailed parameters and operating methods. Each of the RBs is divided into a signaling RB and a data RB. The SRB is used as a route to transmit an RRC message in the control plane (C-Plane), and the DRB is used as a route to transmit user data in the user plane (U-Plane).

Downlink transport channels for transmitting data from a network to a UE may include a Broadcast Channel (BCH - Broadcast CHannel) to transmit system information, and a Shared Channel (SCH - Shared CHannel). downlink to transmit user traffic or a control message. Traffic or control message from a multicast or downlink broadcast service can be transmitted through the downlink SCH or through a downlink multicast channel (MCH) in the downlink . The uplink transport channels for transmitting data from a UE to a network may include a Random Access Channel (RACH -Ranom Access CHannel) for transmitting an initial control message, and an uplink SCH for transmitting traffic of user or a control message.

Physical downlink channels for transmitting information transferred through the downlink transport channels in a radio section between a network and a UE may include a Physical Broadcast Channel (PBCH) to transmit information about a BCH, a Physical Multicast Channel (PMCH) to transmit information about an MCH, a Physical Downlink Shared CHannel Channel (PDSCH) for transmitting information about a PCH and a downlink SCH, and a Physical Downlink Control Channel (PDCCH) in English) (also called DL's L1 / L2 control channel) for transmitting control information provided by the first and second layers, such as downlink (DL) or uplink (UL) planning grant information. Physical uplink channels to transmit information transferred through transport channels of Uplink in a radio section between a network and a UE can include a Physical Uplink Shared CHannel (PUSCH) to transmit information about an uplink SCH, a Physical Random Access Channel (PRACH - Physical Random Access CHannel) to transmit information about a RACH, and a Physical Uplink Control Channel (PUCCH) to transmit control information provided by the first layer and the second layer, such as an ACK or HARQ nAc K, a Planning Request (SR - Scheduling Request, in English), a Channel Quality Indicator (CQI) report.

Next, in this report, a random access procedure provided by an LTE system will be described schematically based on the above description.

First, a UE performs the Random Access procedure in the following cases:

- when the UE makes an initial access because there is no RRC connection with an eNode B,

- when the UE initially accesses a target cell in a transfer procedure,

- when the random access procedure is requested by an order from an eNode B,

- when there is uplink data transmission in a situation where uplink timing is not aligned, or in which a specific radio resource used to request radio resources is not allocated, and

- when a recovery procedure is carried out in case of radio link failure or transfer failure.

In the LTE system, two procedures are provided by selecting a random access preamble: one is a random access procedure based on conflict resolution, in which the UE randomly selects a preamble in a specific group for use, and another is a random access procedure not based on conflict resolution, in which the UE uses a random access preamble assigned only to a specific UE by eNode B. The random access procedure not based on conflict resolution can be used only in the transfer procedure or when requested by the base station order, as described above.

A random access procedure of a UE with a specific eNode B may broadly include (1) a stage of, in the UE, transmitting a random access procedure to eNode B (hereinafter referred to as the "messages 1" transmission stage, if such use does not lead to confusion), (2) a stage of receiving a random access response from eNode B in correspondence with the transmitted random access preamble (then called the "messages 2" transmission stage, if such use does not lead to confusion), (3) a stage of transmitting an uplink message using the information received by the random access response message (hereinafter referred to as the "messages 3" transmission stage if such use does not leads to confusion), and (4) a step of receiving a message corresponding to the uplink message from eNode B (then, called the "message 4" transmission stage if such use does not lead to confusion).

In the random access procedure, the UE stores data to be transmitted through message 3 in a temporary message memory 3 (Msg3), and transmits the data stored in the temporary memory of msg3 in correspondence with the reception of a signal from Uplink concession (UL). The Uplink Grant signal indicates information about uplink radio resources that can be used when the UE transmits a signal to eNode B, and is received in a random access response message received in a PDCCH or a PUSCH in the system of lTe. According to the current LTE system standard, it is defined that, if the UL Concession signal is received in a state in which the data is stored in the temporary memory of Msg3, the data stored in the temporary memory of Msg3 they are transmitted independently of the reception mode of the UL Concession signal. As described above, if data stored in the Msg3 temporary memory is transmitted in correspondence with the reception of all UL Concession signals, problems may occur. Accordingly, there is a need to investigate to solve such problems. The document “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access Medium Access control protocol specification (release 8) ”, 3GPP TS 36.321 V8.2.0, May 1, 2008 (2008-05-01), describes the process of transmitting data stored in the Msg3 temporary memory, based on various determinations made when the UL grant is received from the base station.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a method of data transmission and to a user equipment for this, which substantially obviates one or more of the problems due to the limitations and disadvantages of the related technique.

An object of the present invention is to provide a data information method and a user equipment for this, which is capable of solving a problem that can occur when data stored in a data transmission is transmitted. temporary message memory 3 (Msg3) according to a mode of receiving an uplink concession (UL) signal.

Advantages, objects and additional features of the invention will be presented in part in the description that follows, and in part will be apparent to persons not skilled in the art after examination of the following, or can be seen from the practice of invention. The objectives and other advantages of the invention can be realized and achieved by the structure indicated specifically in the written description and in the claims thereof, as well as in the accompanying drawings.

In order to achieve these objects and other advantages and in accordance with the purpose of the invention, as they are realized and are widely described herein, a method of transmitting data by a user equipment through an uplink includes receiving a uplink grant signal (UL Grant) from a base station in a specific message, determine if there is data stored in a temporary message memory 3 (Msg3) when the UL Concession signal is received in the specific message, determine if the specific message is a random access response message, and transmit the data stored in the temporary memory of Msg3 to the base station using the UL Grant signal received in the specific message, if there is data stored in the temporary memory of Msg3 when the UL Concession signal is received in the specific message, and the specific message is the random access response message.

If there is no data stored in the Msg3 temporary memory of when the UL Concession signal is received in the specific message, or the specific message is not the random access response message, new data can be transmitted to the base station at correspondence with the UL Concession signal received in the specific message.

The UL Concession signal received in the specific message may be an UL Concession signal received on a Physical Downlink Control Channel (PDCCH). In this case, the user equipment can transmit new data in correspondence with the UL Concession signal received in the PDCCH.

The UL Concession signal received in the specific message may be an UL Concession signal received in a random access response message received on the Physical Downlink Shared Channel (PDSCH). In this case, if there is data stored in the Msg3 temporary memory when the UL Concession signal is received in the random access response message, the user equipment can transmit the data stored in the temporary memory in the temporary memory of Msg3 using the UL Grant signal received in the random access response message.

The data stored in the Msg3 temporary memory can be a Media Access Control Protocol Data Unit (MAC PDU) that includes a user equipment identifier, and the stored data Msg3's temporary memory also includes information about a temporary memory status report (BSR - Buffer Status Report, in English) if the user equipment starts the random access procedure for the BSR.

In another aspect of the present invention, a user equipment includes a receiving module that receives an uplink grant (UL Grant) signal from a base station in a specific message, a transmission module that transmits data to the station base using the UL Grant signal received in the specific message, storing a temporary message memory 3 (Msg3) UL data to be transmitted in a random access procedure, and determining a Hybrid Automatic Repeat Request (HARQ) entity if there is data stored in the temporary memory of Msg3 when the receiving module receives the UL Concession signal and the specific message is a message random access response, obtaining the data stored in the temporary memory of Msg3 if there is data stored in the temporary memory of Msg3 when the receiving module receives the UL Concession signal and the specific message is the random access response message, and controlling the module of transmission to transmit the data stored in the temporary memory of Msg3 to the base station using the UL Concession signal received by the receiving module in the specific message.

The user equipment may also include a multiplexing and assembly entity, used for the transmission of new data. In this case, the HARQ entity can obtain the new data to be transmitted from the multiplexing and assembly entity if there is no data stored in the temporary memory of Msg3 when the receiving module receives the UL Grant signal in the specific message or the message received is not the random access response message, and control the transmission module to transmit the new data obtained from the multiplexing and assembly entity using the UL Concession signal received by the receiving module in the specific message.

The user equipment may also include one or more HARQ processes, and temporary HARQ memories corresponding respectively to one or more of the HARQ processes. In this case, the HARQ entity can transfer data obtained from the multiplexing and assembly entity or from the temporary memory of Msg3 to a specific HARQ process of the one or more HARQ processes and control the specific hAr Q process to transmit the data obtained from the multiplexing entity and Assembly or temporary memory of Msg3 through the transmission module.

When the specific HARQ process transmits the data stored in the Msg3 temporary memory through the transmission module, the data stored in the Msg3 temporary memory can be controlled to be copied into a specific HARQ temporary memory corresponding to the process of Specific HARQ, and the data copied into the specific HARQ temporary memory can be controlled to be transmitted through the transmission module.

The UL Concession signal received by the receiving module in the specific message may be an UL Concession signal received on a Physical Downlink Control Channel (PDCCH). In this case, the HARQ entity can control the new data to be transmitted in correspondence with the UL Concession signal received in the PDCCH.

The UL Concession signal received by the receiving module in the specific message may be an UL Concession signal received in a random access response message received on a Physical Downlink Shared Channel (PDSCH), and the HARQ entity can control the data stored in the temporary memory of Msg3 to be transmitted using the UL Grant signal received in the random access response message if there is data stored in the temporary memory of Msg3 when the receiving module receives the UL Grant signal in the random access response message.

In accordance with the previously described embodiments of the present invention, it is possible to transmit data stored in a temporary memory of Msg3 in accordance with a mode of receiving a UL Grant signal, without confusion.

The scope of the invention is defined by the attached independent claims.

It should be understood that both the above general description and the following detailed description of the present invention are exemplary and explanatory, and are intended to provide another explanation of the invention, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a better understanding of the invention and are incorporated and constitute a part of this application, illustrate an embodiment or embodiments of the invention, and together with the description, serve to explain the principle of the invention. In the drawings:

Figure 1 is a schematic view showing the network architecture of an Evolved Universal Mobile Telecommunications System (E-UMTS), as an example of a mobile communications system;

Figures 2 and 3 are views showing the structures of the radio interface protocols between a user equipment (UE) and a UMTS terrestrial radio access network (UTRAN) based on a radio access network standard of the 3rd generation partnership project (3GPP);

Figure 4 is a view illustrating an operating procedure of a UE and a base station (eNode B) in a random access procedure not based on conflict resolution;

Figure 5 is a view illustrating an operating procedure of an UE and an eNode B in a random access procedure based on conflict resolution;

Figure 6 is a view illustrating an uplink Hybrid Auto Repeat Request (HARQ) scheme;

Figure 7 is a view illustrating a method of transmitting a message 3 in a random access procedure, when uplink radio resources are requested;

Figure 8 is a view illustrating a problem that may occur when data stored in a temporary memory of Msg3 is transmitted by a UL Grant signal received in a message other than a random access response message;

Figure 9 is a flowchart illustrating a method of uplink data transmission by a UE, in accordance with a preferred embodiment of the present invention;

Figure 10 is a view illustrating an uplink data transmission method when a Temporary Memory Status Report (BSR) is activated in a UE, in accordance with an embodiment of the present invention; Y

Figure 11 is a schematic view showing the configuration of an UE according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described, with reference to the accompanying drawings. It should be understood that the detailed description that will be disclosed together with the accompanying drawings is intended to describe the exemplary embodiments of the present invention, and is not intended to describe a single embodiment that the present invention can carry out. Next, in this specification, the detailed description includes detailed matters to provide a complete understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be carried out without the detailed issues. For example, the following description will be made assuming that the mobile communications system is a long-term Evolution system of the 3rd Generation Association project (3GPP LTE), but, the present invention is applicable to other mobile communications systems excluding the 3GPP LTE system.

In some cases, well-known structures and devices are omitted, in order not to obscure the concepts of the present invention, and the important functions of the structures and devices are shown in block diagram form. The same reference numbers will be used in all drawings to refer to equal or similar parts.

In the following description, a terminal is assumed to include a mobile or fixed user terminal device, such as a user equipment (UE) and a base station (MS), and a base station includes a node of one end of network that communicates with a terminal, such as a Node B, an eNode B and a base station.

As described above, in the following description, a problem that may occur when data stored in a temporary message memory 3 (Msg3) is transmitted in detail according to a mode of reception of a Concession signal will be described in detail. Uplink (UL), and a method of solving the problem will be described. The transmission and reception of a signal using a random access procedure and a Hybrid Automatic Repeat Request (HARQ) scheme will be described in detail.

Figure 4 is a view illustrating an operating procedure of a terminal (UE) and a base station (eNode B) in a random access procedure not based on conflict resolution.

(1) Assignment of random access preamble

As described above, a random access procedure not based on conflict resolution (1) in a transfer procedure and (2) can be performed when the random access procedure is requested by an order of an eNode B. Even In these cases, a random access procedure based on conflict resolution can be performed.

First, it is important that a specific random access preamble with no possibility of collision be received from eNode B, for the random access procedure not based on conflict resolution. The methods of receiving the random access preamble may include a method that uses a transfer order and a method that uses a Physical Downlink Control Channel (PDCCH) order. The UE receives an assigned random access preamble (S401).

(2) Message transmission 1

The UE transmits the preamble to eNode B upon receipt of the random access preamble assigned from eNode B as described above (S402).

(3) Message transmission 2

The UE attempts to receive a random access response in a random access response reception window indicated by eNode B by a transfer order or system information after the transmission of the random access preamble in step S402 (S403). More specifically, the random access response information can be transmitted in the form of a Packet Data Access Unit (PDU) of Media Access Control (MAC), and the MAC PDU can be transferred through a Shared physical downlink channel (PDSCH). In addition, the UE preferably monitors the PDCCH in order to allow the UE to properly receive the information transferred through the PDSCH. That is, the PDCCH may preferably include information about a UE that the PDSCH should receive, information on the frequency and time of the radio resources of the PDSCH, a transfer format of the PDSCH and others. In this memory, if the PDCCh has been correctly received, the UE can properly receive the random access response transmitted in the PDSCH according to the PDCCH information. The random access response may include a random access preamble identifier (for example, the Temporary Identifier of the random access radio network (RA-RNTI)), indicating the Concession UL uplink radio resources, a temporary C-RNTI, a Time Advance Command (TAC), and others.

As described above, the reason why the random access response includes the identifier of the random access preamble is that a single random access response can include information from the random access response of at least one UE and, thus, it is reported for which UE the UL Grant, the temporary C-RNTI and the TAC are valid. At this stage, it is assumed that the UE selects an identifier of the random access preamble that matches the random access preamble selected by the UE in step S402.

In the random access procedure not based on conflict resolution, it is determined that the random access procedure is normally performed, receiving the information of the random access response, and the random access procedure can be terminated.

Figure 5 shows a view illustrating an operating procedure of an UE and an eNode B in a random access procedure based on conflict resolution.

(1) Message Transmission 1

First, the UE can randomly select a single random access preamble from a set of random access preambles indicated by the system information or a transfer order, and select and transmit a Physical Random Access Channel (PRACH) capable of transmitting the random access preamble (S501).

(2) Receiving Messages 2

One method of receiving random access response information is similar to the random access procedure not based on conflict resolution described above. That is, the UE attempts to receive its own random access response within a random access response reception window indicated by eNode B by means of the system information, the transfer order, after the random access preamble is transmitted in step S501, and receives a physical downlink Shared Channel (PDSCH) using the random access identifier information corresponding thereto (S502). Accordingly, the UE can receive a UL Concession, a temporary C-RNTI, a TAC and others.

(4) Message Transmission 3

If the UE has received the random access response valid for the UE, the UE can process all the information included in the random access response. That is, the Ue requests the TAC, and stores the temporary C-RNTI. In addition, the data that will be transmitted in correspondence with the receipt of the valid random access response can be stored in a temporary memory of Msg3. Next, a process of storing data in the temporary memory of Msg3 and the transmission of the data will be described with reference to Figure 7.

The UE uses the UL Concession received to transmit the data (i.e., message 3) to eNode B (S503). Message 3 must include an EU identifier. In the random access procedure based on conflict resolution, eNode B cannot determine which UE is performing the random access procedure, but later the UEs will be identified for conflict resolution.

In this report, two different schemes can be provided to include the UE identifier. A first scheme is to transmit the cell identifier of the UE by an uplink transmission signal corresponding to the UL Concession if the UE has already received a valid cell identifier assigned by a corresponding cell before the random access procedure. Conversely, the second scheme is to transmit the unique identifier of the UE (for example, S-TMSI or random ID) if the UE has not received a valid cell identifier before the random access procedure. If the UE has transmitted data corresponding to the UL Concession, the UE initiates a conflict resolution timer (CR - Contention Resolution).

(5) Receiving messages 4

After transmitting the data with its identifier through the UL Concession included in the random access response, the UE waits for an indication (instruction) of the eNode B for conflict resolution. That is, the UE tries to receive the PDCCH in order to receive a specific message (S504). In this memory, there are two schemes to receive the PDCCH. As described above, the UE attempts to receive the PDCCH using its own cell identifier if the message 3 transmitted in correspondence with the UL Grant is transmitted to receive the PDCCH using the C-RNTI included in the random access response if The identifier is your unique identifier. Then, in the above scheme, if the PDCCH is received through its own cell identifier before the conflict resolution timer has expired, the UE determines that the random access procedure has been carried out normally and completely The random access procedure. In the last scheme, if the PDCCH is received by the temporary C-RNTI before the conflict resolution timer has expired, the UE checks the data transferred by the PDSCH indicated by the PDCCH. If the unique identifier of the UE is included in the data, the UE determines that the random access procedure has been performed normally and completes the random access procedure.

Next, in this report, the LTE system will be described, by way of example, a Hybrid Auto Repeat Request (HARQ) scheme of a MAC Layer, focusing on the transmission of uplink data.

Figure 6 is a view illustrated in the HARQ scheme.

A UE can receive the UL Concession information or the UL planning information of an eNode B in a PDCCH (step S601), in order to transmit data to the eNode B by the HARQ scheme. In general, the UL planning information may include an UL identifier (for example, a C-RNTI or a semi-persistent C-RNTI), resource block allocation, transmission parameters (modulation, coding scheme and redundancy version), and a New Data Indicator (NDI). In the LTE system, the UE has eight HARQ processes and HARQ processes are carried out in synchronization with Transmission Time Intervals (TTI). That is, specific HARQ processes can be sequentially assigned according to the time points at which data is received, so that the first HARQ process is used in TTI 9 and the second HARQ process is used in TTI 10 After a first HARQ process is used in TTI 1, a second HARQ process is used in TTI 2, ..., and a HARQ eight process is used in TTI 8.

In addition, since HARQ processes are assigned in a synchronized manner as described above, a HARQ process connected to a TTI in which a PDCCH is received for initial transmission of specific data is used for data transmission. For example, if the UE is supposed to have received a PDCCH that includes UL planning information in a TTI of order n, the UE transmits data in a TTI of order (N + 4). In other words, a HARQ process of order K assigned in the order TTI (N + 4) is used for data transmission. That is, the UE can transmit the data to the eNode B in a PUSCH according to the UL planning information after checking the UL planning information transmitted to the UE by monitoring the PDCCH in each TTI (step S602).

When the data has been received, eNode B stores the data in a soft temporary memory and attempts to decode the data. The eNode B transmits an ACK signal if the decoding of the data is successful, and transmits a NACK signal if the decoding of the data fails. In Figure 6, step (S603) is shown an example in which the decoding of the data fails and the eNode B transmits the NACK signal on a physical HARQ Indicator Channel (PHICH).

When the ACK signal has been received from eNode B, the UE determines that the transmission of data to eNode B is successful, and then transmits the data. However, when the UE receives the NACK signal as shown in Figure 6, the UE may determine that the transmission of the data to eNode B has failed and retransmits the same data by the same scheme or a new scheme (step S604 ).

The HARQ retransmission of the UE can be done by a non-adaptive scheme. That is, the initial transmission of specific data can be performed when the PDCCH that includes the UL planning information should be received, but retransmission can be performed even when the PDCCH has not been received. In non-adaptive HARQ retransmission, the data is retransmitted using the same UL planning information as the initial transmission in a TTI in which a next HARQ process is assigned, without receiving the PDCCH.

The HARQ retransmission of the UE can be carried out by means of an adaptive scheme. In this case, the transmission parameters for the retransmission are received in the PDCCH, but the UL planning information included in the PDCCH may be different from that of the initial transmission according to the channel states. For example, if the state of the channel is better than that of the initial transmission, the transmission can be performed at a high bit rate. In contrast, if the state of the channel is worse than that of the initial transmission, the transmission can be performed at a bit rate lower than that of the initial transmission.

If the UE receives the UL planning information in the PDSCCH, it is determined whether the data to be transmitted at this time is data that is initially transmitted or previous data that is retransmitted, by means of an NDI field included in the PDCCH. The NDI field is switched in the order of 0, 1, 0, 1, ... whenever new data is transmitted, as described above, and the NDI field of the retransmission has the same value as that of The initial transmission. Accordingly, the UE can compare the NDI field with the previously transmitted value, in order to determine whether the data is retransmitted or not.

The UE counts the number of transmission times (CURRENT_TX_NB) whenever data is transmitted by the HARQ scheme, and deletes the data stored in the HARQ temporary memory when CURRENT_TX_NB has reached a maximum transmission number set in a RRC layer.

When the retransmitted data is received, the eNode B attempts to combine the received data and the data stored in the soft temporary memory, due to the failure of decoding by various schemes and decoding the combined data. The eNode B transmits an ACK signal to the UE if the decoding is successful, and transmits a NACK signal to the UE if the decoding fails. The eNode B repeats a process of transmitting the NACK signal and receiving the retransmitted data until the decoding of the data is successful. In the example of Figure 6, eNode B attempts to combine the data retransmitted in step S604 and the data that has been received previously and are stored, and decodes the combined data. The eNode B transmits the ACK signal to the UE in the PHICH if the decoding of the received data is successful (step S605). The UE may transmit the UL planning information for the subsequent data transmission to the UE in the PDCCH, and may transmit the NDI switched to 1, in order to inform that the UL planning information is not used for adaptive retransmission , but is used for the transmission of new data (step S606). The UE can transmit new data to eNode B in the PUSCH corresponding to the UL planning information received (step S607).

The random access procedure can be activated in the cases described above, as described above. Next, in this report, the case in which the UE requests UL radio resources will be described.

Figure 7 is an illustrative view of a method of transmitting a message 3 in a random access procedure, when UL radio resources are requested.

When new data is generated in a temporary transfer memory 601 of the UE, for example, a temporary RLC memory and a temporary PDCP memory, the UE generally must inform eNode B of information about the generation of the data. More precisely, when data is generated that has higher priority than that of the data stored in the temporary transfer memory of the UE, the UE informs eNode B that the data has been generated.

This indicates that the UE requests radio resources from eNode B in order to transmit the generated data. The eNode B can allocate appropriate radio resources to the UE according to the above information. The information about the generation of the data is called the report of the status of the temporary memory (then in this report, called “BSR”). Next, in this report, as described above, the request for the transmission of the BSR is represented by activating the transmission of the BSR (S6100). If BSR transmission has been activated, the UE must transmit the BSR to eNode B. However, if the radio resources to transmit the BSR do not exist, the UE can activate a random access procedure and attempt to request radio resources ( S6200).

As described above, if the random access procedure for requesting radio resources to eNode B has been activated, the UE may transmit a random access preamble to eNode B and receive a random access response message corresponding thereto. , as described with reference to Figures 4 and 5. In addition, a message 3 (i.e. a MAC PDU) that includes an UE identifier can be generated, and a BSR can be generated and stored in a temporary memory of Msg3 602, in a MAC layer of the UE through a temporary memory of Msg3602, in a MAC layer of the UE by means of the UL Grant signal included in the random access response message. Message 3 stored in the temporary memory of Msg3602 can be copied and stored in a temporary HARQ 603 process memory indicated by the UL Grant information. Figure 7 shows, by way of example, the case in which the HARQ A process is used for the transmission of messages 3. In this way, the message 3 is copied into the temporary memory of HARQ 603 corresponding to the HARQ process. TO. Message 3, stored in the temporary memory of HARQ 603, can be transmitted to eNode B in a PUSCH.

Meanwhile, if the UE must perform a new random access procedure test due to the conflict resolution failure, the UE can transmit the random access preamble to eNode B again and receive a random access response (S6300). However, in the retry random access procedure, the UE uses the message 3 stored in the temporary memory of Msg3 602 again, without generating a new message 3. That is, the UE can copy and store the MAC PDU corresponding to the message 3 stored in the temporary memory of Msg3 602 in a temporary memory of HARQ 604, and transmit the MAC PDU, in accordance with the included UL Grant signal in the random access response received in the retry random access procedure. Figure 7 shows the case in which the retry randomized access procedure is performed by a HARQ B process. The data stored in the temporary memory of Msg3602 can be copied into the temporary memory of HARQ B and transmitted.

As described above, if the random access response is received while the random access procedure is being performed, the UE stores the message 3 stored in the temporary memory of Msg3 in the temporary memory of HARQ and transmits the message 3. As described above, in the current LTE system standard for the HARQ process, it is defined that the transmission of data stored in the temporary memory of Msg3 is activated by receiving some UL Concession signal. accordingly, the CR timer can be erroneously activated in such a way that an erroneous conflict resolution process is performed. Due to the Conflict Resolution procedure, the BSR described above cannot be transmitted normally and the UE may reach a stalemate. This problem will be described in detail with reference to Figure 8.

Figure 8 is a view illustrating a problem that may occur when data stored in a temporary memory of Msg3 is transmitted by an uplink Grant (UL) signal received in a message other than a random access response message.

As described with reference to Figure 7, the UE can activate the BSR when high priority data is generated, transmit the random access preamble in order to transmit the BSR to eNode B (S801), and receive the response of random access corresponding to them (S802).

The UE can then transmit a message 3 that includes the BSR by means of the UL Grant information included in the random access response message received in step S802 (S803). If message 3 is transmitted, the CR timer is operated as described with reference to Figure 5.

If the random access procedure is completed before the CR timer expires, the UE determines that the random access procedure has not been completed successfully (S804). In this case, the UE may attempt to restart the random access procedure from the transmission of the random access preamble.

At this time, since eNode B does not yet know that the UE is performing the random access procedure, eNode B can transmit a UL Grant signal independent of the random access procedure in a masked PDCCH (S805). In this case, according to the current LTE system standard, the UE transmits the message 3 stored in the temporary memory of Msg3 in accordance with the UL Grant signal received in the PDSCH in step S805 (S806). Also, when message 3 is transmitted, the CR timer is reset. That is, when the UE does not receive the random access response message, the CR timer is reset in step S806.

Although the CR timer starts when the UE transmits message 3 in step S806, eNode B may not know that the UE is performing the random access procedure because the reception of the random access preamble and the transmission of the response message Random access is not performed. If another UL Concession signal is received on the PDCCH that includes the identifier of the UE, (S807), the UE determines that the current random access procedure has been successfully completed. Accordingly, the UE can stop the current CR time (S808).

If message 3 transmitted to eNode B in step S806 has not been successfully received by eNode B (A), the UE no longer transmits message 3 which includes the BSR. Accordingly, if no additional data is generated, the UE may not transmit the data generated in the temporary transfer memory to eNode B.

The problem described above will be described as follows.

According to the current LTE system standard, if the UL Concession signal is received in a state in which the data has been stored in the temporary memory of Msg3, the UE transmits the data stored in the temporary memory of Msg3 to eNode B. At this time, the UL Concession signal may be transmitted by eNode B, not for the transmission of data stored in the temporary memory of Msg3, but for the transmission of other data. Accordingly, the CR timer may be mistakenly started.

In addition, if eNode B does not know that the CR timer has been mistakenly initiated in the UE and transmits the UL Concession signal for the transmission of other data, as described with reference to Figure 8, the information ( for example, BSR) to be transmitted by message 3 may have been lost.

In addition, the UE cannot receive a message 4 to complete an appropriate conflict resolution procedure, even with respect to the ongoing random access procedure.

In a preferred embodiment of the invention to solve the problem described above, the data stored in the temporary memory of Msg3 is transmitted restrictively only in the case where the UL Concession signal received from the eNode B has been received in the message of random access response, but not in all cases where the UL Concession signal has been received from eNode B. If the UL Grant signal is received on the masked PDCCH not by the random access response message message, but by the UE identifier (C-RNTI or a semi-persistent planning radio network temporary identifier (SPS) -RNTI)) in a state in which data is stored in the temporary memory of Msg3, a method of obtaining and transmitting new data (MAC PDU) to eNode B is suggested instead of the data stored in the temporary memory of Msg3.

Figure 9 is a flow chart illustrating a method of transmitting UL data by a UE in accordance with a preferred embodiment of the present invention. In more detail, Figure 9 shows the operation of a HARQ entity of the UE, in accordance with an embodiment of the present invention in each TTI.

First, the UE HARQ entity can identify a HARQ process associated with a TTI (S901). If the HARQ process associated with the TTI is identified, the HARQ entity of the UE can determine whether or not a UL Concession signal is received from eNode B indicated in the TTI (S902). The UE can determine whether a temporary HARQ memory corresponding to the HARQ process is empty or not if there is no information about the signal of UL Concession received in the TTI, and to perform a non-adaptive retransmission, as described with reference to Figure 6, if data exists in the HARQ temporary memory (S903).

Meanwhile, if there is a UL Concession signal received from eNode B in the TTI, it can be determined (1) if the UL Concession signal has not been received in the PDCCH indicated by the temporary C-RNTI, and the NDI switches from the value during the transmission before the HARQ process, (2) if the previous NDI exists, and this transmission is the initial transmission of the HARQ process, (3) if the UL Concession signal is received in the indicated PDCCH by the C-RNTI, and the temporary HARQ memory of the HARQ process is empty, or (4) if the UL Grant signal is received in the random access response message (S904). If any of the conditions (1) to (4) is satisfied in step S904 (A), the method advances to step S906. In contrast, if any of the conditions (1) to (4) is not satisfied in step S904 (B), the method advances to step S905 of performing adaptive retransmission using the UL Concession signal (S905).

Meanwhile, the UE determines whether there is data in the temporary memory of Msg3 in step S906 (S906). Furthermore, even when there is data in the temporary memory of Msg3, the UE determines whether the received UL Concession signal is received in the random access response message (S907). That is, the UE according to the present embodiment transmits the data stored in the temporary memory of Msg3 only when there is data in the temporary memory of Msg3 when the UL Concession signal is received and the UL Concession signal is received in the random access response message (S908). If there is no data in the Msg3 temporary memory when the UL Concession signal is received or the UL Concession is not received in the random access response message, the UE determines that eNode B makes a request not for transmission of the data stored in the temporary memory of Msg3, but for the transmission of new data, and performs the transmission of new data (S909). In more detail, the HARQ entity of the UE can be controlled in such a way that a MAC PDU that includes new data from a multiplexing and assembly entity is obtained and transmitted through the HARQ process.

Next, in this report, an example applied to a process of transmitting a BSR by the UE operating through the embodiment described with reference to Figure 9, as shown in Figure 8, will be described.

Figure 10 is a view illustrating a method of transmitting UL data when a BSR is activated in a UE, in accordance with an embodiment of the present invention.

As described above, new data can be generated in the RLC and PDCP temporary memories of the UE. It is assumed that the new data generated has a higher priority than the data already stored in the RLC and PDCP temporary memories. The UE can activate the transmission of the BSR in order to inform an eNode B of information about the generation of the data (step 1).

The UE must transmit the BSR in accordance with the BSR transmission activation, but, in a special case, there may be no recourse to transmit the BSR. In this case, the UE can activate a random access procedure to transmit the BSR. It is assumed that the random access procedure activated in the present embodiment is the random access procedure based on conflict resolution with reference to Figure 5. The UE may transmit a random access preamble to eNode B, in accordance with the activation of the random access procedure (step 2).

The eNode B can receive the random access preamble transmitted by the UE and transmits a random access response message to the UE (step 3). The UE can receive the random access response message.

The UE may generate a message 3 that includes the BSR and an UE identifier according to an UL Grant signal included in the random access response message received in step 3 and stores the message 3 in a temporary memory of Msg3 (stage 4).

The UE can select a HARQ process according to the UL Grant information included in the random access response message received in step 3 and copy and store the message 3 stored in the Msg3 temporary memory in the corresponding temporary memory to the selected HARQ process. Next, the data stored in the HARQ temporary memory can be transmitted to eNode B in accordance with the UL HARQ procedure described with reference to Figure 6 (step 5). The UE starts (or resets) the CR timer by transmitting message 3.

When the CR timer expires, the UE can retry the random access procedure. That is, a random access preamble and a PRACH resource can be prepared to be selected and transmitted to eNode B. However, in a state in which the CR timer is not operated, the UE can receive the Concession signal. UL of eNode B in a PDCCH masked by an identifier of the UE (step 6).

When the UL Concession signal has been received at the PDCCH in step 6, the UE generates new data different from the data stored in the Msg3 temporary memory according to the information in the UL concession received in step 6, such as a new MAC PDU, unlike the procedure of the embodiment of Figure 8 for transmitting the message 3 stored in the temporary memory of Msg3 in accordance with the information of the UL Concession received in stage 6 (stage 7). In more detail, if the UE receives the UL Concession signal in step 6, but does not receive the UL Concession signal in the random access response message, a MAC PDU can be obtained and transmitted to transmit not data stored in the temporary memory of Msg3, but the new data of a multiplexing and assembly entity, using a HARQ process corresponding to them.

After the new MAC PDU has been generated, the UE according to the present embodiment can select a HARQ process according to the UL Grant signal received in step 6, store the MAC PDU that has just been generated in step 7 in the temporary memory corresponding to the HARQ process, and transmit the MAC PDU to eNode B according to the UL HARQ procedure (step 8).

The UE can then perform a random access procedure that includes the transmission of the random access preamble and the reception of the random access response and transmit the BSR stored in the temporary memory of Msg3 to eNode B.

In accordance with the embodiment described above, it is possible to prevent eNode B from erroneously operating the CR timer due to the UL Concession signal transmitted not for transmission of data stored in the temporary memory of Msg3, but for transmission of new data. Accordingly, the problem of the loss of message 3 must be resolved. In addition, the random access procedure of the UE with the eNode B can be performed normally.

Unlike the embodiment described above, as another embodiment of the present invention, a method of performing a process can be implemented while ignoring the UL Concession signal if the UL Concession signal is received from eNode B in the masked PDCCH by the UE identifier during the random access procedure of the UE. In this case, the UE can transfer message 3 to eNode B by the normal random access procedure, and eNode B can retransmit the UL Grant signal for the transmission of new data, after the UE random access procedure. It is completed.

Next, in this specification, the configuration of the UE for the implementation of the above-described embodiment of the present invention will be described.

Figure 11 is a schematic view showing the configuration of an UE according to an embodiment of the present invention.

As shown in Figure 11, the UE according to the present embodiment may include a receive module (Rx) 1101 to receive an UL Grant signal from an eNode B in a specific message, a transmission module (Tx ) 1102 to transmit data to eNode B using the received UL Concession signal, a temporary memory of Msg3 1103 to store transmitted UL data in a random access procedure, and a HARQ 1104 entity to control the transmission of UL data from the UE.

Specifically, the HARQ entity 1104 of the UE according to the present embodiment performs a function of determining if there is data stored in the temporary memory of Msg3 1103 when the Rx 1101 module receives the UL Concession signal and a function of determining whether The Rx 1101 module receives the UL Grant signal in a random access response message. If there is data stored in the temporary memory of Msg3 1103 when the Rx 1101 module receives the UL Concession signal and the Rx 1101 module receives the UL Concession signal in the random access response message, the data stored in the memory Temporal of Msg3 1103 are controlled to be obtained and transmitted to eNode B. If there is no data stored in the temporary memory of Msg3 1103 when the Rx 1101 module receives the UL Concession signal, and the Rx 1101 module receives the UL Concession signal not in the random access response message, but in the PDCCH, the data stored in the temporary memory of Msg3 1103 is not transmitted, but new data is obtained from the multiplexing and assembly entity in the form of a MAC PDU, and is transmitted to eNode B.

In addition, in order to carry out the UL HARQ procedure, the UE according to the present embodiment may include one or more HARQ 1106 processes and HARQ 1107 temporary memories corresponding to the HARQ 1106 processes. In the system of current LTE, eight independent HARQ processes are defined, but the present invention is not limited thereto.

Meanwhile, the HARQ entity 1104 according to the present embodiment can transfer the data obtained from the multiplexing and assembly entity 1105, or the temporary memory of Msg3 1103, to a specific HARQ process 1106 using the configuration described above, and control the specific HARq 1106 process for transmitting the data obtained from the multiplexing and assembly entity 1105 or the temporary memory of Msg3 1103 by means of the Tx 1102 module. As described above, if the specific HARq 1106 process transmits the data stored in the temporary memory of Msg3 1103 via the Tx 1102 module, as described above, the data stored in the temporary memory of Msg3 1103 can be copied into the specific HARQ 1107 temporary memory corresponding to the specific HARQ 1106 process, and the data copied into the specific HARQ 1107 temporary memory can be transmitted by the Tx 1102 module. At this time, the data stored in the temporary memory of Msg3 1103 is a MAC PDU that includes an identifier of the UE, and may include further information such as a BSR according to the purpose of the random access procedure.

In the configuration of the UE shown in Figure 11, the Tx 1102 module and the Rx 1101 module can be configured as physical layer process modules 1108, and the HARQ entity 1104, the multiplexing and assembly entity 1105 and one or more HARQ 1106 processes can be configured as a MAC 1109 layer module. However, the invention is not limited thereto. In addition, the temporary memory of Msg3 1103 and the temporary memories of HARQ 1107 corresponding to the HARQ 1106 processes can be implemented using any storage medium.

Although the signal transmission or reception technology and the UE for the same apply to a 3GPP LTE system, they are applicable to several mobile communications systems that have a similar procedure, in addition to the 3GPP LTE system.

Other aspects of the invention are:

one. A method of transmitting data by a user equipment through an uplink, the method comprising:

receive an uplink Grant, UL Grant, signal from a base station in a specific message;

determine if there is data stored in a temporary memory of Msg3 when the UL Concession signal is received in the specific message;

determine if the specific message is a random access response message; Y

transmit the data stored in the Msg3 temporary memory to the base station using the UL Concession signal received in the specific message, if there is data stored in the Msg3 temporary memory when the UL Concession signal is received in the message specific, and the specific message is the random access response message.

2. The method according to aspect 1, which further comprises:

transmit new data to the base station in correspondence with the UL Concession signal received in the specific message, if there is no data stored in the temporary memory of Msg3 when the UL Concession signal is received in the specific message, or the Specific message is not the random access response message.

3. The method according to aspect 2, in which the transmission of the new data to the base station includes:

obtaining a Media Access Control Protocol Data Unit, MAC PDU, from a multiplexing and assembly entity; Y

transmit the MAC PDU to the base station.

Four. The method according to aspect 2, in which the UL Concession signal received in the specific message is an UL Concession signal received in a physical uplink control channel, PDCCH, and in which the equipment of The user transmits new data in correspondence with the UL Concession signal received in the PDCCH.

5. The method according to aspect 1, in which the data stored in the temporary memory of Msg3 is a Media Access Control Protocol Data Unit, MAC PDU, which includes an identifier of the user equipment.

6. The method according to aspect 5, in which the data stored in the temporary memory of Msg3 also includes information about a report of the status of the temporary memory, BSR, if the user equipment initiates a random access procedure for the BSR.

7. A user equipment comprising:

a reception module adapted to receive a Uplink Concession signal, UL Grant, from a base station in a specific message;

a transmission module adapted to transmit data to the base station using the UL Concession signal received in the specific message;

a temporary message memory 3, Msg3 adapted to store UL data to be transmitted in a random access procedure;

a hybrid automatic repeat request entity, HARQ, adapted to: determine if there is data stored in the temporary memory of Msg3 when the receiving module receives the UL Grant signal in the specific message, and the specific message is a message of random access response; obtain the data stored in the temporary memory of Msg3 if there is data stored in the temporary memory of Msg3 when the receiving module receives the UL Grant signal and the specific message is the random access response message; and check that the transmission module transmits the data stored in the temporary memory of Msg3 to the base station using the UL Concession signal received by the receiving module in the specific message.

8. The user equipment according to aspect 7, which further comprises a multiplexing and assembly entity used for the transmission of new data,

in which the HARQ entity obtains the new data to be transmitted from the multiplexing and assembly entity if there is no data stored in the Msg3 temporary memory when the receiving module receives the UL Concession signal in the specific message, or the message received is not the random access response message, and controls the transmission module to transmit the new data obtained from the multiplexing and assembly entity using the UL Concession signal received by the receiving module in the specific message.

9. The user equipment according to aspect 8, which also includes:

one or more HARQ processes; Y

HARQ temporary memories corresponding respectively to the one or more HARQ processes, in which the HARQ entity transfers the data obtained from the multiplexing and assembly entity or the Msg3 temporary memory to a specific HARQ process of the one or more HARQ processes, and controls the specific HARQ process to transmit the data obtained from the multiplexing and assembly entity or the temporary memory of Msg3 through the transmission module.

10. The user equipment according to aspect 9, in which, when the specific HARQ process transmits the data stored in the temporary memory of Msg3 via the transmission module, the data stored in the temporary memory of Msg3 is controlled to be copied to a specific HARQ temporary memory corresponding to the specific HARQ process, and the data copied in the specific HARQ temporary memory is controlled to be transmitted by the transmission module.

eleven. The user equipment according to aspect 8, in which the UL Concession signal received by the receiving module in the specific message is an UL Concession signal received in a physical downlink control Channel, PDCCH, Y

in which the HARq entity controls new data to be transmitted in correspondence with the UL Concession signal received in the PDCCH.

12. The user equipment according to aspect 7, in which the UL Concession signal received by the receiving module in the specific message is an UL Concession signal received in the Physical Downlink Shared Channel, PDSCH, and

in which the HARQ entity controls the data stored in the temporary memory of Msg3 to be transmitted using the UL Grant signal received in the random access response message if there is data stored in the temporary memory of Msg3 when the module of Reception receives the UL Concession signal in the random access response message.

13. The user equipment according to aspect 7, wherein the data stored in the temporary memory of Msg3 is a Media Access Control Protocol Data Unit, MAC PDU, which includes an identifier of the user equipment.