KR20110113596A - Method of transmitting and receiving a contention based uplink channel signal - Google Patents

Abstract

The present invention discloses methods of transmitting and receiving contention-based uplink channel signals and apparatuses supporting the same. In one embodiment of the present invention, a method for transmitting a first uplink data through a contention-based uplink channel includes an uplink grant message in which a user equipment includes allocation information for contention-based uplink channel from a base station. And receiving the first uplink data, which is distinguished from the second uplink data transmitted by the other terminal through the contention-based uplink channel, through the contention-based uplink channel, to the base station. Can be.

Description

Method for transmitting and receiving a contention based uplink channel signal

The present invention relates to a communication method and apparatus used in a wireless access system. In particular, the present invention relates to methods for transmitting and receiving contention-based uplink channel signals and devices supporting the same.

Wireless access systems are widely deployed to provide various kinds of communication services such as voice and data. In general, a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.

When a plurality of terminals attempt to access a base station through a contention-based uplink channel, the plurality of terminals may transmit an uplink signal using the same identifier. In this case, since the base station transmits an uplink signal using a plurality of terminals using the same identifier, it may be difficult to distinguish each terminal.

Accordingly, an object of the present invention is to provide methods for effectively classifying and demodulating uplink signals transmitted from a plurality of terminals at a base station.

Another object of the present invention is to provide methods for minimizing performance degradation of a base station when detecting and demodulating one or more uplink signals transmitted through a contention-based channel at a base station.

Technical objects to be achieved in the present invention are not limited to the above-mentioned matters, and other technical problems which are not mentioned are those skilled in the art from the embodiments of the present invention to be described below. Can be considered.

In order to solve the above technical problem, the present invention discloses a method for transmitting and receiving a competition-based uplink channel signal and apparatuses supporting the same.

According to an aspect of the present invention, a method for transmitting first uplink data through a contention-based uplink channel includes: receiving, by a terminal, an uplink grant message including allocation information for contention-based uplink channel from a base station; And transmitting the first uplink data, which is distinguished from the second uplink data transmitted by the other terminal through the uplink channel based on the contention, to the base station through the contention-based uplink channel.

In this case, the contention-based uplink channel may be allocated to one or more terminals. In addition, the terminal may transmit the first uplink data through the contention-based uplink channel without transmitting a scheduling request (RS) for requesting resource allocation for transmitting the first uplink data to the base station.

The aspect may further include selecting a reference signal (RS) parameter, selecting a scrambling code based on the RS parameter, and generating first uplink data using the scrambling code.

Or selecting a second identifier identifying a terminal based on a first identifier included in an uplink grant message, selecting a scrambling code according to the second identifier, and generating first uplink data using the scrambling code. It may further comprise a step.

Alternatively, the method may further include selecting a reference signal (RS) parameter, selecting an interleaving method based on the RS parameter, and generating first uplink data by applying the interleaving method.

In another aspect of the present invention, in a method for receiving first uplink data through a contention-based uplink channel, a base station transmits an uplink grant message including allocation information for contention-based uplink channel to a first terminal. Receiving the first uplink data from the first terminal, the first terminal being distinguished from the second uplink data transmitted through the contention-based uplink channel through the contention-based uplink channel; It may include.

In this case, the contention-based uplink channel may be allocated to one or more terminals. In addition, the base station may receive the first uplink data through the contention-based uplink channel without receiving a scheduling request (RS) for requesting resource allocation for transmitting the first uplink data from the first terminal. .

In another aspect of the present invention, the first uplink data may be generated with a scrambling code selected based on a reference signal (RS) parameter.

Alternatively, the first uplink data may be generated as a scrambling code according to a second identifier for identifying the terminal selected based on the first identifier included in the uplink grant message.

Alternatively, the first uplink data may be generated by applying an interleaving method selected based on a reference signal (RS) parameter.

As another aspect of the present invention, a terminal for transmitting first uplink data through a contention-based uplink channel includes a transmission module for transmitting a channel signal, a reception module for receiving a channel signal, and a contention-based uplink channel. It may include a processor for supporting uplink data transmission through.

In this case, the terminal receives an uplink grant message including allocation information on a contention-based uplink channel from a base station through the receiving module, and the other terminal is a contention-based uplink channel through a contention-based uplink channel. The first uplink data, which is distinguished from the second uplink data transmitted through the, may be transmitted to the base station using a transmission module.

As another aspect of the present invention, a base station receiving first uplink data through a contention-based uplink channel includes a transmission module for transmitting a channel signal, a reception module for receiving a channel signal, and a contention-based uplink channel. It may include a processor for supporting uplink data reception through.

In this case, the base station transmits an uplink grant message including allocation information on a contention-based uplink channel to a first terminal through a transmission module, and a second terminal is a contention-based uplink through a contention-based uplink channel. The first uplink data, which is distinguished from the second uplink data transmitted through the link channel, may be received from the first terminal through the receiving module.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described in detail below by those skilled in the art. Can be derived and understood.

According to the embodiments of the present invention, the following effects are obtained.

First, the base station can effectively classify and demodulate uplink signals transmitted from multiple terminals.

Second, when the base station detects and demodulates one or more uplink channel signals transmitted through a contention-based channel, performance degradation of the base station can be minimized.

Third, by minimizing the number of attempts to detect and demodulate the base station in the contention-based uplink channel, the complexity of the processing operation of the base station can be reduced and the power usage of the base station can be reduced.

Fourth, the base station may transmit a response for contention-based channel signal transmission for the transmission of a plurality of terminals to distinguish each terminal.

Fifth, each terminal can reduce the complexity of the processing operation and reduce the power usage of the terminal by receiving and demodulating only the response related to the channel signal transmitted by the terminal among the response of the contention-based uplink channel signal received.

The effects obtained in the embodiments of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be found in the following description of the embodiments of the present invention, Can be clearly derived and understood by those skilled in the art. That is, unintended effects of practicing the present invention may also be derived from those skilled in the art from the embodiments of the present invention.

1 is a view showing the structure of a radio frame that can be used in embodiments of the present invention.
2 is a diagram illustrating a resource grid for one downlink slot that can be used in embodiments of the present invention.
3 is a diagram illustrating a structure of a downlink subframe that can be used in embodiments of the present invention.
4 is a diagram illustrating an example of an uplink subframe structure that can be used in embodiments of the present invention.
5 is a diagram illustrating an example of a case where a base station allocates a shared UL grant to a terminal.
6 is a diagram illustrating one of methods of using PUCCH formats 1a and 1b for shared PUCCH-SR.
7 illustrates an example of a scheduling request procedure associated with contention-based uplink data transmission.
8 is a diagram illustrating a method of transmitting uplink data using a scrambling code associated with a reference signal according to an embodiment of the present invention.
9 illustrates another method for transmitting uplink data using a scrambling code associated with a reference signal according to an embodiment of the present invention.
FIG. 10 is a diagram for one of methods of transmitting uplink data using a scrambling code associated with an identifier according to an embodiment of the present invention.
FIG. 11 illustrates another method of transmitting uplink data using a scrambling code associated with an identifier according to an embodiment of the present invention.
12 is a diagram illustrating one of methods of transmitting uplink data using an interleaving method or order as an embodiment of the present invention.
FIG. 13 illustrates another method of transmitting uplink data using an interleaving method or an order according to an embodiment of the present invention.
FIG. 14 illustrates an example of an apparatus for supporting a method for transmitting and receiving a contention-based uplink channel signal disclosed in the present invention.

Embodiments of the present invention are directed to various methods of transmitting and receiving a contention-based uplink channel signal and devices supporting the same.

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a mobile station. Here, the base station is meant as a terminal node of a network that directly communicates with a mobile station. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.

In addition, a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS), or a mobile terminal. Or it may be replaced with terms such as Advanced Mobile Station (AMS).

Also, the transmitting end refers to a fixed and / or mobile node providing data service or voice service, and the receiving end means a fixed and / or mobile node receiving data service or voice service. Therefore, in the uplink, the mobile station may be the transmitting end and the base station may be the receiving end. Similarly, in a downlink, a mobile station may be a receiving end and a base station may be a transmitting end.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the IEEE 802.xx system, the 3rd Generation Partnership Project (3GPP) system, the 3GPP LTE system, and the 3GPP2 system, which are wireless access systems, and in particular, the present invention. Embodiments of may be supported by 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213 and 3GPP TS 36.321 documents. That is, obvious steps or portions not described among the embodiments of the present invention may be described with reference to the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

In addition, specific terms used in the embodiments of the present invention are provided to help the understanding of the present invention, and the use of the specific terms may be changed into other forms without departing from the technical spirit of the present invention. .

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems.

CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).

UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. The LTE-A (Advanced) system is an improved system of the 3GPP LTE system. In order to clarify the technical features of the present invention, 3GPP LTE / LTE-A mainly described, but can also be applied to IEEE 802.16e / m system.

1.3 GPP LTE Of LTE Basic Structure of the _A System

1 is a view showing the structure of a radio frame that can be used in embodiments of the present invention.

A radio frame consists of 10 subframes, and one subframe consists of two slots. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). At this time, the length of one subframe is 1ms, the length of one slot is 0.5ms.

One slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain, and includes a plurality of Resource Blocks (RBs) in the frequency domain. The OFDM symbol is for representing one symbol period in a 3GPP LTE system using an Orthogonal Frequency Division Multiplexing Access (OFDMA) scheme in downlink. That is, the OFDM symbol may be referred to as an SC-FDMA symbol or a symbol interval according to a multiple access scheme. The RB includes a plurality of consecutive subcarriers in one slot in resource allocation units.

The structure of the radio frame of FIG. 1 is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.

2 is a diagram illustrating a resource grid for one downlink slot that can be used in embodiments of the present invention.

The downlink slot includes a plurality of OFDM symbols in the time domain. In FIG. 2, one downlink slot includes seven OFDM symbols, and one resource block (RB) includes 12 subcarriers in a frequency domain.

Each element on the resource grid is called a resource element (RE), and one resource block RB includes 12 × 7 resource elements RE. The number N ^DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.

3 is a diagram illustrating a structure of a downlink subframe that can be used in embodiments of the present invention.

The subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the subframe are a control region to which control channels are allocated, and the remaining OFDM symbols are a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated.

Downlink control channels used in the 3GPP LTE system include a PCFICH (Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel). The PCFICH signal transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of the control channel signal in the subframe. The PHICH carries an ACK (Acknowledgement) / NACK (None-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, an ACK / NACK signal for uplink data transmitted by a user equipment (UE) is transmitted on a PHICH.

Control information transmitted through the PDCCH is called downlink control information (DCI). DCI includes resource allocation information and other control information for a UE or UE group. For example, it may include uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command.

PDCCH includes transmission format and resource allocation information of downlink shared channel (DL-SCH), transmission format and resource allocation information of uplink shared channel (UL-SCH), paging channel (PCH) Paging information on a channel), system information on a DL-SCH, resource allocation information on a higher layer control message such as a random access response transmitted on a PDSCH, a transmit power control command set for individual UEs in a certain UE group, and transmission It can carry information on power control commands, activation of the Voice of Internet Protocol (VoIP), and the like.

Multiple PDCCHs may be transmitted in one control region, and the UE may monitor multiple PDCCHs. The PDCCH may be transmitted on one or more consecutive control channel elements (CCEs). CCE is a logical allocation resource used to provide a PDCCH at one coding rate based on the state of a radio channel. The CCE corresponds to a plurality of resource element groups (REGs). The format of the PDCCH and the number of available bits of the PDCCH are determined according to the correlation between the coding rate provided in the CCE and the number of CCEs. The base station determines the PDCCH format according to the DCI to be transmitted to the UE, and attaches the CRC to the control information.

The CRC is masked with a unique identifier (RNTI: Radio Network Temporary Identifier) according to the usage or owner of the PDCCH. If the PDCCH is for a particular UE, then the unique identifier of the UE (eg, C-RNTI: Cell-RNTI) is masked to the CRC. If the PDCCH is for a paging message, the paging indicator identifier (eg, P-RNTI: Paging-RNTI) is masked in the CRC. In addition, if the PDCCH is for system information (especially system information block), the system information identifier and system information RNTI (S-RNTI) may be masked to the CRC. A random access RNTI (RA-RNTI) may be masked to the CRC to indicate a random access response that is a response to the reception of the random access preamble of the UE.

In a carrier aggregation environment, the PDCCH may be transmitted through one or more component carriers and may include resource allocation information for one or more component carriers. For example, the PDCCH is transmitted on one component carrier, but may include resource allocation information for one or more PDSCHs and PUSCHs.

4 is a diagram illustrating an example of an uplink subframe structure that can be used in embodiments of the present invention.

Referring to FIG. 4, the uplink subframe includes a plurality of slots (eg, two). The slot may include different numbers of SC-FDMA symbols according to the CP length. The uplink subframe is divided into a data region and a control region in the frequency domain. The data area includes a physical uplink shared channel (PUSCH) and is used to transmit a data signal including voice information. The control region includes a PUCCH (Physical Uplink Control Channel) and is used to transmit uplink control information (UCI). The PUCCH includes RB pairs located at both ends of the data region on the frequency axis and hops to a slot boundary. In the LTE system, the UE does not simultaneously transmit the PUCCH signal and the PUSCH signal in order to maintain a single carrier characteristic. However, in the LTE-A system, the PUCCH signal and the PUSCH signal may be simultaneously transmitted in the same subframe according to the transmission mode of the UE, and the PUCCH signal may be piggybacked onto the PUSCH signal and transmitted.

PUCCH for one UE is allocated as an RB pair in a subframe, and RBs belonging to the RB pair occupy different subcarriers in each of two slots. This is said that the RB pair allocated to the PUCCH is frequency hopping at the slot boundary.

PUCCH may be used to transmit the following control information.

SR (Scheduling Request): Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.

HARQ ACK / NACK: This is a response signal for a downlink data packet on a PDSCH. Indicates whether the downlink data packet was successfully received. One bit of ACK / NACK is transmitted in response to a single downlink codeword, and two bits of ACK / NACK are transmitted in response to two downlink codewords.

Channel Quality Indicator (CQI) or Channel State Information (CSI): Feedback information for the downlink channel. Multiple Input Multiple Output (MIMO) related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). 20 bits are used per subframe.

The amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission. SC-FDMA available for transmission of control information means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of the subframe in which the Sounding Reference Signal (SRS) is set, the last of the subframe SC-FDMA symbols are also excluded. The reference signal is used for coherent detection of the PUCCH. PUCCH supports seven formats according to the transmitted information.

Table 1 shows a mapping relationship between PUCCH format and UCI in LTE.

PUCCH format UCI Format 1 Scheduling Request (SR) Format 1a 1-bit HARQ ACK / NACK with or without SR Format 1b 2-bit HARQ ACK / NACK with or without SR Format 2 20 coded bits (CQI) Format 2 1 or 2 bits of HARQ ACK / NACK for CQI and Extended CP Format 2a CQI and 1-Bit HARQ ACK / NACK Format 2b CQI and 2-bit HARQ ACK / NACK

Referring to Table 1, UCI according to the PUCCH format can be checked.

In the embodiments of the present invention, various radio access technologies of the 3GPP system may be applied. For example, a description of an uplink channel and a reference signal (RS) used in embodiments of the present invention can be found in sections 5.1 and below in 3GPP TS 36.211 specification documents and in sections 5.2 and below in 3GPP TS 36.212 specification documents. See description.

2. Shared D-SR ( Shared Dedicated - Scheduling Request )

The following two options can be considered to enable shared D-SR.

Option 1: The UL grant can be addressed to a new SR-RNTI. That is, a new SR-RNTI can be configured per group of shared terminals.

Option 2: PUCCH format 1a or PUCCH format 1b may be used for the SR. For example, when PUCCH format 1a is used, two terminals may be identified. In addition, four terminals may be identified when PUCCH format 1b is used. After the base station receives the SR using the PUCCH format 1a or 1b, the base station may transmit a general UL grant to the identified terminal.

Hereinafter, a shared PUCCH SR transmission process using option 1 will be described.

In case two or more terminals share the same SR resource, the base station cannot distinguish whether one or more terminals use one SR. In this case, the base station may (1) allocate a shared UL grant to the terminal or (2) allocate a dedicated grant for each terminal whenever receiving a shared SR.

5 is a diagram illustrating an example of a case where a base station allocates a shared UL grant to a terminal.

After the base station allocates the shared UL grant to the terminal, if HARQ transmission is unlikely to succeed, the base station may allocate a dedicated grant to all the terminals sharing the corresponding SR.

Referring to FIG. 5, an eNB establishes a connection with a UE by informing information (eg, offset information and period information, etc.) of radio resources required for transmitting a shared scheduling request (SR) to one or more UEs. You can configure it. In this case, the shared scheduling request resource refers to a PUCCH resource used by the terminal to make a scheduling request to the base station, and may be allocated to two or more terminals in duplicate. The resources may be distinguished from each other by a physical time / frequency region and a sequence (sequence or code) (S510).

The terminal may transmit a shared scheduling request (SR) signal to the base station to request uplink resource allocation based on the information on the radio resource received in step S510 (S520).

Upon receiving the SR, the base station allocates a shared uplink resource to the terminal and may transmit a PDCCH signal including the shared UL grant to the terminal to inform the terminal of the shared uplink resource (S530).

The terminal transmits the UL data to the base station through the allocated shared UL resources (ie, PUSCH) (S540).

If two or more terminals simultaneously transmit UL data through a shared UL resource, collisions between UL data may occur. In addition, there may be an error in the UL data transmitted by the terminal or uplink data may not be transmitted through the UL resources allocated to the terminal by the base station. In this case, the base station transmits a NACK (non-Acknowlegdment) signal to the terminal (S550).

In addition, the base station may allocate a dedicated UL resource to each terminal to allocate a new uplink resource. For example, the base station may allocate a dedicated UL grant for each of the terminals sharing the SR. Alternatively, the base station may allocate a dedicated UL grant to some of the terminals sharing the SR, and perform non-adaptive HARQ retransmission on the shared PUSCH resources to the other terminals (S560).

As shown in FIG. 5, by assigning a dedicated UL grant to terminals that fail to transmit UL, collision between UL data can be prevented and retransmission delay can also be controlled.

Unlike FIG. 5, whenever a base station receives a shared SR, the base station may allocate a dedicated grant for each terminal. Although the SR is shared by multiple terminals through a dedicated signaling configuration, the base station can allocate a dedicated UL grant for each terminal.

Through this, it is possible to prevent uplink data collision between terminals during PUSCH transmission, it is possible to use the retransmission method used in the LTE Rel-8 system. Since not all terminals that have received the UL grant have data to transmit, part of the PUSCH signal may be discarded. When the base station allocates a dedicated UL grant to each terminal each time the base station receives the SR, the PUSCH resource consumption may be less than the CB transmission on the PUSCH (CB-PUSCH).

6 is a diagram illustrating one of methods of using PUCCH formats 1a and 1b for shared PUCCH-SR.

Hereinafter, a method of using PUCCH format 1a or PUCCH format 1b for shared PUCCH SR as option 2 will be described. Referring to FIG. 6, each UE can share the same SR without collision by using PUCCH format 1a or 1b. That is, even if two UEs transmit an SR in the same TTI, the base station can successfully detect the SR and identify each UE.

Hereinafter, a case of using a contention-based PUSCH signal transmission method and a D-SR method together will be described.

The contention-based uplink channel is a channel allocated because the base station cannot predict when a scheduling request (SR) or bandwidth request (BR) of each terminal is needed. In addition, the terminal may need to quickly communicate with the base station in an emergency situation or a high speed environment. In this case, it may be inefficient for any terminal to perform a process of establishing a connection through a plurality of signaling with the base station. Therefore, a contention-based uplink channel is used when an arbitrary terminal needs to perform fast communication with a base station.

Assuming that contention based resource allocation is possible in all TTIs, there may be a difference of 3 ms and 1 ms between CB transmission and SR periods. This is because the terminal does not need to transmit the D-SR to the base station and wait for a response thereto. The same effect can be achieved through dedicated pre-allocated UL resources, but allocating dedicated resources to all terminals in every TTI is very expensive.

7 illustrates an example of a scheduling request procedure associated with contention-based uplink data transmission.

Referring to FIG. 7, a base station (eNB) may request resource information (ie, SR resource information) required for a shared dedicated scheduling request (D-SR) and resource information for a contention-based uplink channel to one or more UEs. That is, CB resource information) may be transmitted (S710).

In step S710, SR resource information refers to information on a PUCCH resource used by a UE to make a scheduling request to a base station. CB resource information indicates information on a PUSCH resource for contention-based uplink data transmission. SR resource information and CB resource information may be allocated to two or more terminals in duplicate. In addition, the SR resource information and the CB resource information may be distinguished from each other by a physical time / frequency region and a sequence or code.

The step S710 may be allocated through higher layer signaling such as RRC (Radio Resource Control). However, when dynamic UL resource allocation is required, the step S710 may be replaced by allocating using a PDCCH signal including a CB-RNTI.

If one or more terminals have UL data to transmit, the terminals may transmit a scheduling request (SR) to the base station, respectively, in order to be allocated an uplink resource for transmitting the UL data (S720).

In addition, the terminal may transmit uplink data (ie, a transmission block TB) to the base station together with the SR transmission without waiting for the UL grant according to the SR transmission (S730).

The base station may identify the terminal using the CB resources based on the received SR. When the base station receives one or more SRs associated with the same UL resource, the base station may determine that a collision has occurred between the terminals. Accordingly, the base station may transmit a NACK signal and a dedicated UL grant to the terminal regardless of whether uplink data is normally received. If the base station receives only one SR associated with the same UL resource, the base station may determine that a collision between terminals does not occur. Therefore, when the base station normally receives the UL data transmitted through the corresponding UL resource, the base station may transmit an ACK signal, otherwise the NACK signal to the terminal (S740).

The terminal may retransmit corresponding UL data when receiving the NACK signal from the base station, and may transmit new UL data when receiving the ACK signal (S750).

Since the terminal is identified through the SR in step S750, it is possible to adaptively retransmit the UL data to the base station through the other UL resources. Through this, the UE can reduce the load of the CB resources.

3. Contention-based uplink channel signal transmission method

In a method of transmitting uplink signals through a contention based (CB) uplink channel (eg CB-PUSCH, CB-PUCCH), uplink synchronization UEs are allocated uplink resources according to a general method. Without transmitting an uplink channel signal to the base station. That is, the CB UL channel signal transmission method means that the terminal transmits a scheduling request (SR) to the base station and transmits an uplink channel signal without receiving an uplink resource according to the SR. This CB UL channel signal transmission scheme can reduce transmission delay and signaling overhead. Hereinafter, a method of transmitting a UL signal through a CB UL channel will be briefly referred to as "CB transmission" or "UL transmission." In addition, the channel signal is meant to include both an uplink data signal and an uplink control signal.

A general feature of CB transmission is that error rates increase for multiple users using the same shared uplink grant. Therefore, it is an important issue that the eNB has a fast and efficient resource allocation means and method between CB transmission and Contention Free (CF) transmission.

The uplink resource for CB transmission may be allocated through higher layer signaling such as RRC (Radio Resource Control), but the fast dynamic allocation method of uplink resource block for CB transmission uses a downlink physical control channel (PDCCH). will be. The CB grant transmitted on the PDCCH may be used to allocate uplink resources for CB transmission. A PDCCH signal and a Contention Based Radio Network Temporary Identifier (CB-RNTI) may be used to identify the CB grant transmitted on the PDCCH. The CB grant may be scheduled per subframe like other grants. In this manner, scheduling of uplink CF transmission may not be affected by CB transmission, and static or semi-static allocation of CB resources may be avoided even while CB resources are dynamically allocated according to uplink load.

For uplink (UL) transmission of the UE, the CB grant may indicate a transmission resource on the PUSCH. Therefore, CB uplink data may be transmitted on the PUSCH. The UE may transmit CB-UL data only through an uplink resource (ie, a CB UL channel resource) indicated by the CB grant only when it does not have a dedicated CF grant at a specific time.

If common resources are used, a C-RNTI MAC control element may be added to the MAC PDU to identify the terminal, and a Buffer Status Report (BSR) may be used to assist the uplink scheduler of the base station. . Simultaneously with CB transmission, the UE may transmit a scheduling request (SR) for requesting CF resource to the base station.

That is, the uplink data is transmitted on the PUSCH, the C-RNTI MAC control element is added to identify the terminal, and the BSR may be transmitted together with the terminal during UL initial transmission to assist the uplink scheduler.

4. Scrambling  Contention-based uplink transmission method using code

When the terminal transmits contention-based uplink data through the PUSCH or the PUCCH, one or more terminals may perform UL transmission through the contention-based physical resource. In this case, UL signals transmitted from one or more terminals may degrade the detection performance of the base station.

In a radio access system, a terminal and / or a base station uses a scrambling technique to distinguish each signal. For example, in the LTE system, each UE performs scrambling in front of modulation using a value related to a Radio Network Temporary Identifier ( _RNTI ) for uplink transmission. Here, n _RNTI is a cell RNTI (C-RNTI: Cell-RNTI), a unique value for identifying each UE, and the UE applies scrambling with the same C-RNTI value when transmitting a PDCCH decoding and a PUSCH signal. That is, the RNTI used by the specific terminal to decode downlink information may be used for uplink transmission of the corresponding terminal.

When the base station transmits one UL grant (or resource allocation information) to the plurality of terminals, the base station may use the RNTI that can be accessed by the plurality of terminals. The base station may use one RNTI even when using the RNTI for a specific channel allocation, and the terminal receiving the UL grant may transmit contention-based UL data to the base station using the RNTI.

In this case, when a plurality of terminals attempt to access through an allocated contention-based uplink channel (for example, CB-PUSCH or CB-PUCCH), the plurality of terminals may perform UL transmission using the same RNTI. have. Therefore, when a plurality of terminals attempt to access the base station through the same uplink radio resource, the base station can be difficult to distinguish each terminal because the plurality of terminals transmit the UL data using the same RNTI.

That is, since a plurality of terminals generate and transmit a plurality of uplink signals through the same scrambling, the decoding performance of the base station may be greatly degraded. Accordingly, a technique for effectively classifying and demodulating UL signals transmitted from multiple terminals is needed.

Accordingly, in the present invention, when the base station detects and demodulates signals transmitted from one or more terminals through a contention-based uplink channel (eg, CB-PUSCH or CB-PUCCH), a method and a base station for minimizing performance degradation of the base station Disclosed are methods for minimizing the number of detection and demodulation attempts in.

Hereinafter, methods of using the scrambling code associated with the reference signal RS and methods of using the scrambling code associated with the identifier RNTI will be described.

In order to effectively classify and demodulate signals transmitted from multiple terminals in a base station, the terminal may transmit UL data using different scrambling codes in a contention-based uplink channel. However, if there are many available sets of scrambling codes, the base station should detect and demodulate all possible sets of scrambling codes. In this case, the base station may increase complexity in detecting and demodulating the scrambling code, and may waste power of the base station.

Accordingly, embodiments of the present invention efficiently detect and demodulate a base station by associating or constraining a scrambling code set with other parameters representing a cyclic prefix or interleaving order or method of a reference signal when using different scrambling codes. Suggest ways to do it.

In embodiments of the present invention, different scrambling codes may use existing scrambling codes in a particular system. For example, it may mean a scrambling code at the front end of modulation in the 3GPP LTE system. In addition, an additional scrambling code may be used separately from the existing scrambling.

(1) reference signal RS Associated with) Scrambling  How to use the code

8 is a diagram illustrating a method of transmitting uplink data using a scrambling code associated with a reference signal (RS) as an embodiment of the present invention.

In order to effectively classify and demodulate the signals transmitted from the plurality of terminals at the base station, the plurality of terminals may use different scrambling codes associated with each RS. The terminal may arbitrarily select an RS parameter before selecting the scrambling code (S810).

The terminal may select a scrambling code according to the selected RS parameter. That is, the terminal may derive a scrambling code to be used by the terminal from the selected RS parameter (S820).

In addition, the terminal may generate an uplink signal using the selected RS parameter and the scrambling code and transmit the uplink signal to the base station (S830 and S840).

In step S810, the terminal may use a scrambling code associated with the code index of the RS and / or the cyclic shift amount / cyclic prefix of the RS. Cyclic translocation of the RS may be performed in the time-domain and / or frequency domain. In addition, the UE may arbitrarily select an RS parameter from a specific RS set as an opportunity. Alternatively, the RS parameter may be selected based on a terminal identifier such as C-RNTI of the terminal.

9 illustrates another method for transmitting uplink data using a scrambling code associated with a reference signal according to an embodiment of the present invention.

Referring to FIG. 9, the base station may transmit a CB-UL grant for contention based resource allocation to the terminal. In this case, the terminal may receive and decode the CB-UL grant to obtain resource information on a contention-based uplink channel (e.g. CB-PUCCH, CB-PDSCH) (S910).

The terminal may select an RS parameter to be used by the terminal in the RS parameter set according to a predetermined rule. The RS parameter may be a cyclic prefix and / or a cyclic prefix to be applied to a specific code index. Alternatively, the RS parameter may be a code index and a cyclic prefix and / or cyclic prefix index to be applied to the code index. For example, a terminal having one transmit antenna uses up to 12 different codes while using the same physical root index using a cyclic prefix of a length 12 RS code in one resource block (RB). Can be used (S920).

The terminal may select a code to be used for scrambling according to a predetermined rule from the selected RS parameter (S930).

The terminal may generate UL data using the selected RS parameter and the scrambling code and transmit the UL data to the base station. That is, the UE may transmit UL data to the base station using resource allocation information (eg, CB-PUSCH) obtained through the CB-UL grant (S940).

The base station may perform RS detection and channel estimation on the available RS parameter sets. For example, when an RS corresponding to a specific RS parameter is detected, the base station may know a scrambling code associated with the RS. That is, the base station can demodulate the UL data using the RS parameter and the scrambling code (S950).

The base station may scramble a response (eg, ACK / NACK) to the detected scrambling codes with each scrambling code or a scrambling code associated therewith and transmit the scrambling code to the terminal. At this time, it is preferable that the scrambling code used by the UE for the UL data transmission and the scrambling code used by the BS for the response are selected according to a predetermined rule (S960).

When a plurality of terminals transmit UL data using different scrambling codes, each terminal receives and demodulates only an ACK / NACK (i.e., response message) corresponding to a scrambling code or an associated scrambling code thereof. A response to UL data can be received.

In FIG. 9, the process of transmitting and receiving the CB-UL grant in step S910 may be replaced with the process of transmitting and receiving information on the shared D-SR. In addition, although FIG. 9 illustrates an example of the CB-PUSCH, the present invention may be applied to the CB-PUCCH by linking an RS parameter and a scrambling code.

As a variant of FIG. 9, when the UE simultaneously transmits the shared D-SR signal and the CB-PUSCH signal (or sequentially without waiting for a specific response from the base station), the UE shares the scrambling code associated with the RS with the shared D-SR. It can be transformed into a scrambling code associated with. That is, when the terminal transmits a specific shared D-SR to the base station, the terminal may select a scrambling code associated with the shared D-SR according to a predetermined rule.

In embodiments of the present invention, the UE can quickly and accurately determine which UE is the uplink channel signal to the base station to the UE-specific information in the contention-based uplink channel signal (eg, C-RNTI, station Identifier, etc.) to the base station.

(2) the identifier ( RNTI Associated with) Scrambling  How to use the code

FIG. 10 is a diagram for one of methods of transmitting uplink data using a scrambling code associated with an identifier according to an embodiment of the present invention.

In order to effectively classify and demodulate signals transmitted from multiple terminals in a base station, the terminal may transmit uplink data using different RNTIs in a contention-based channel. In the embodiments of the present invention, the RNTI is described as an example, but may be replaced with another identifier for scrambling. For example, the IEEE 802.16m system may be replaced with a station ID (STID).

Embodiments of the present invention newly define a Contention Based-RNTI (CB-RNTI) for transmitting uplink data through a contention-based uplink channel. Of course, the terminal may use the existing C-RNTI as it is.

Referring to FIG. 10, the terminal may select CB-RNTI for scrambling (S1010).

The terminal may select a scrambling code associated with the CB-RNTI, generate uplink data using the CB-RNTI and / or scrambling code, and transmit the uplink data to the base station (S1020 and S1030).

FIG. 11 illustrates another method of transmitting uplink data using a scrambling code associated with an identifier according to an embodiment of the present invention.

Referring to FIG. 11, a base station may transmit a scrambled CB-UL grant to a terminal through a first CB-RNTI (CB-RNTI-1). The terminal may receive and demodulate the first CB-RNTI to know the information of the contention-based uplink channel (e.g. CB-PUSCH or CB-PUCCH) (S1110).

The UE may select a second CB-RNTI (CB-RNTI-2) within an RNTI set according to a predetermined rule (S1120).

In step S1120, the first CB-RNTI for transmission and reception of the CB-UL grant and the second CB-RNTI for transmission and reception of uplink data based on contention may be the same. For example, the first CB-RNTI for transmitting and receiving the CB-UL grant may be included as one of the second CB-RNTI set for transmitting and receiving the contention-based uplink channel signal.

In step S1120, the second CB-RNTI available to the terminal may be selected according to the following predetermined rule. For example, the second CB-RNTI set may consist of n second CB-RNTI sets that are incremented by + a (where a is a natural number greater than 1) from the first CB-RNTI used in the CB-UL grant. have.

In this case, the variables a and n may be predetermined values between the terminal and the base station, or may be signaled according to a specific event at the base station. That is, the information on the second CB-RNTI set may be included in the CB-UL grant and transmitted to the terminal.

As the base station transmits a and / or n values to the terminal, the base station may adjust the collision probability of the uplink data. For example, when a contention-based channel is allocated to a small number of terminals, the base station may set a and / or n values small. In addition, when a large number of terminals are allocated to the same contention-based channel, the base station may set a and / or n to be large and transmit them to the terminal.

The base station may adjust the collision probability for multiple terminals to select the same scrambling code through this signaling. In addition, the base station allocates a small RNTI set to the terminal, thereby reducing the complexity and power usage of the RNTI set when the base station detects UL data.

Referring to FIG. 11 again, the UE may select a scrambling code associated with the second CB-RNTI (S1130).

The terminal may generate UL data using the selected second CB-RNTI and the scrambling code. That is, the terminal may generate scrambled UL data using the second CB-RNTI. The terminal may transmit the generated UL data to the base station through the CB-PUSCH or CB-PUCCH (S1140).

The base station may detect and demodulate each UL data transmitted by the plurality of terminals using the available second CB RNTI sets. That is, the base station may derive the second set of available CB RNTIs using the first CB-RNTI used in step S1110 (S1150).

The base station may independently transmit each ACK / NACK response message for the detected second CB-RNTIs using the second CB-RNTI or an RNTI associated therewith (S1160).

When a plurality of terminals transmit using different second CB-RNTI, each terminal receives and demodulates only ACK / NACK signal corresponding to the second CB-RNTI or its associated RNTI transmitted UL data You can see the response to.

In FIG. 11, the process of transmitting and receiving the CB-UL grant may be replaced with the process of transmitting and receiving information on the shared D-RS. In addition, when the shared D-SR signal and the CB-PUSCH signal is transmitted at the same time

As a variant of FIG. 11, when the terminal simultaneously transmits the shared D-SR signal and the CB-PUSCH signal (or sequentially without waiting for a specific response from the base station), the terminal shares the scrambling code associated with the RS with the shared D-SR. It can be transformed into a scrambling code associated with. That is, when the terminal transmits a specific shared D-SR to the base station, the terminal may select a scrambling code associated with the shared D-SR according to a predetermined rule.

In embodiments of the present invention, the UE can quickly and accurately determine which UE is the uplink channel signal to the base station to the UE-specific information in the contention-based uplink channel signal (eg, C-RNTI, station Identifier, etc.) to the base station.

5. Interleaving  Contention-based uplink transmission method using

In order to effectively classify and demodulate signals transmitted from multiple terminals in the base station, the terminal may transmit the uplink channel signal to the base station using different interleaving methods or sequences in the contention-based uplink channel. In general, the receiving end may restore the received signal by using the same interleaving method or order used in the transmitting end (ie, in reverse order). If the receiver uses a different interleaving method or order used by the transmitter, the signal is merely noise. That is, since a plurality of terminals use different interleaving methods or sequences, the base station may process signals of other terminals as noise when restoring UL signals of a specific terminal.

12 is a diagram illustrating one of methods of transmitting uplink data using an interleaving method or order as an embodiment of the present invention.

The terminal may select an RS parameter from a reference signal (RS) set to transmit a contention-based channel signal. In this case, the UE may select an arbitrary RS parameter or an RS parameter based on its C-RNTI (S1210).

The UE may select an interleaving method or order for UL data according to the selected RS parameter (S1220).

The terminal may generate UL data using the selected interleaving method or order and transmit the UL data to the base station (S1230, S1240).

FIG. 13 illustrates another method of transmitting uplink data using an interleaving method or an order according to an embodiment of the present invention.

Referring to FIG. 13, a base station may transmit a CB-UL grant to contention-based resource allocation to a terminal. In this case, the UE may receive and decode the CB-UL grant to obtain information on a contention-based uplink channel (e.g. CB-PUCCH, CB-PDSCH) (S1310).

The terminal may select an RS parameter to be used by the terminal in the RS parameter set according to a predetermined rule. The RS parameter may be a cyclic prefix and / or a cyclic prefix to be applied to a specific code index. Alternatively, the RS parameter may be a code index and a cyclic prefix and / or cyclic prefix index to be applied to the code index. For example, a terminal having one transmit antenna uses up to 12 different codes while using the same physical root index using a cyclic prefix of a length 12 RS code in one resource block (RB). It can be used (S1320).

The terminal may derive the interleaving method or order according to a predetermined rule from the selected RS parameter (S1330).

The terminal may generate UL data using the selected RS parameter and the interleaving method or order and transmit the UL data to the base station. That is, the terminal may transmit UL data to the base station through the CB-PUSCH channel obtained through the CB-UL grant (S1340).

The base station may perform RS detection and channel estimation on the available RS parameter sets. For example, when an RS corresponding to a specific RS parameter is detected, the base station may know an interleaving method or order associated with the RS. That is, the base station can demodulate the UL data using the RS parameter and the interleaving method or order (S1350).

The base station may transmit a response to the detected interleaving method or order (eg, ACK / NACK) to the terminal using a parameter for each interleaving method or order, or a scrambling code associated with it or an RNTI associated therewith. In this case, the interleaving method or order used by the UE for UL data transmission and the interleaving method or order used by the base station may be selected according to a predetermined rule (S1360).

When a plurality of terminals transmit UL data by using different interleaving methods, each terminal has an ACK / NACK (i.e., ACK / NACK) corresponding to an interleaving method or sequence transmitted by itself or an RNTI associated thereto. , Only the response message) can be received and demodulated to receive the response to the UL data.

In FIG. 13, the process of transmitting and receiving the CB-UL grant in step S1310 may be replaced with the process of transmitting and receiving information on the shared D-SR. In addition, in FIG. 13, an example of the CB-PUSCH has been described. However, the present invention may be applied to the CB-PUCCH by linking an RS parameter and an interleaving method or order.

As a variant of FIG. 13, when the UE simultaneously transmits the shared D-SR signal and the CB-PUSCH signal (or sequentially without waiting for a specific response from the base station), the UE shares the interleaving method or order associated with the RS. It can be used by modifying the interleaving method or order associated with the -SR. That is, when the terminal transmits a specific shared D-SR to the base station, the terminal may select an interleaving method or order associated with the shared D-SR according to a predetermined rule.

In embodiments of the present invention, the UE can quickly and accurately determine which UE is the uplink channel signal to the base station to the UE-specific information in the contention-based uplink channel signal (eg, C-RNTI, station Identifier, etc.) to the base station.

FIG. 14 is a diagram illustrating an example of an apparatus for supporting a method of transmitting and receiving a contention-based uplink channel signal according to an embodiment of the present invention.

A user equipment (UE) may operate as a transmitter in uplink and a receiver in downlink. In addition, an e-Node B (eNB) may operate as a receiver in uplink and as a transmitter in downlink.

That is, the terminal and the base station may include a transmitting module (Tx module: 1440, 1450) and a receiving module (Rx module: 1450, 1470) to control the transmission and reception of information, data, and / or messages, respectively. , Antennas 1400 and 1410 for transmitting and receiving data and / or messages. In addition, the terminal and the base station may each include processors 1420 and 1430 for performing the above-described embodiments of the present invention, and memories 1480 and 1490 for temporarily or continuously storing the processing of the processor. Can be.

In particular, the processors 1420 and 1430 of the terminal and the base station may support the methods for transmitting and receiving the contention-based uplink channel signal disclosed in the embodiments of the present invention. For example, the processor of the terminal may select a specific RS parameter to select a scrambling code, a terminal identifier (eg C-RNTI), or an interleaving method, and select a scrambling code, a terminal identifier, or an interleaving method or order according to the RS parameter. Can be. In addition, the processor of the terminal may control the transmission module to generate the UL channel signal according to the selected scrambling code or the interleaving method or order, and transmit the UL channel signal to the base station.

The processor of the base station may detect the RS parameter and perform channel estimation on the basis of a scrambling code or an interleaving method or order in the UL channel signal transmitted by the terminal. Alternatively, the processor of the base station may demodulate the UL channel signal by detecting the C-RNTI of the terminal scrambled to the UL channel signal.

The transmitting module and the receiving module included in the terminal and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission. Duplex) may perform packet scheduling and / or channel multiplexing. In addition, the terminal and base station of FIG. 14 may further include a low power radio frequency (RF) / intermediate frequency (IF) module.

The apparatus described with reference to FIG. 14 is a means in which methods for transmitting and receiving various contention-based UL channel signals disclosed in the embodiments of the present invention can be implemented. Embodiments of the present invention can be performed using the components and functions of the above-described terminal and base station apparatus.

Meanwhile, in the present invention, the terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, an MBS. A Mobile Broadband System phone, a hand-held PC, a notebook PC, a smart phone, or a Multi Mode-Multi Band (MM-MB) terminal may be used.

Here, the smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal that integrates data communication functions such as calendar management, fax transmission / reception, and Internet access, have. In addition, a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., code division multiple access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. For example, software code may be stored in the memory units 1480 and 1490 and driven by the processors 1420 and 1430. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

Embodiments of the invention may be embodied in a variety of other forms without departing from the essential features of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship or may be incorporated as new claims by post-application correction.

Embodiments of the present invention can be applied to various radio access systems. Examples of various radio access systems include 3GPP LTE systems, 3GPP LTE-A systems, 3GPP2 and / or IEEE 802.16xx systems. The embodiments of the present invention can be applied not only to the various wireless access systems described above, but also to all technical fields applying the various wireless access systems.

Claims (14)

In the method for transmitting the first uplink data through the contention-based uplink channel,
Receiving, by a terminal, an uplink grant message including allocation information for the contention-based uplink channel from a base station; And
Transmitting the first uplink data to the base station, the first uplink data being distinguished from the second uplink data transmitted by the other terminal through the contention-based uplink channel through the contention-based uplink channel; Uplink data transmission method. The method of claim 1,
The contention-based uplink channel is characterized in that assigned to one or more terminals, uplink data transmission method. The method of claim 2,
The terminal transmits the first uplink data through the contention-based uplink channel without transmitting a scheduling request (RS) for requesting resource allocation for transmitting the first uplink data to the base station. Uplink data transmission method. The method of claim 3, wherein
Selecting a reference signal (RS) parameter;
Selecting a scrambling code based on the RS parameter; And
And generating the first uplink data with the scrambling code. The method of claim 3, wherein
Selecting a second identifier for identifying the terminal based on a first identifier included in the uplink grant message;
Selecting a scrambling code according to the second identifier; And
And generating the first uplink data with the scrambling code. The method of claim 3, wherein
Selecting a reference signal (RS) parameter;
Selecting an interleaving method based on the RS parameter; And
Generating the first uplink data by applying the interleaving method. In a method for receiving first uplink data through a contention-based uplink channel,
Transmitting, by a base station, an uplink grant message including allocation information for the contention-based uplink channel to a first terminal; And
Receiving, from the first terminal, the first uplink data, which is distinguished from the second uplink data transmitted by the second terminal through the contention-based uplink channel, through the contention-based uplink channel; Including, uplink data receiving method. The method of claim 7, wherein
The contention-based uplink channel is characterized in that assigned to one or more terminals, uplink data receiving method. The method of claim 8,
The base station receives the first uplink data through the contention-based uplink channel without receiving a scheduling request (RS) for requesting resource allocation for transmitting the first uplink data from the first terminal. Uplink data receiving method, characterized in that. The method of claim 9,
The first uplink data is generated with a scrambling code selected based on a reference signal (RS) parameter. The method of claim 9,
The first uplink data is generated with a scrambling code according to a second identifier for identifying the terminal selected based on the first identifier included in the uplink grant message, uplink data receiving method. The method of claim 9,
The first uplink data is generated by applying an interleaving method selected based on a reference signal (RS) parameter. In a terminal for transmitting first uplink data through a contention-based uplink channel,
A transmission module for transmitting a channel signal;
A receiving module for receiving a channel signal; And
Including a processor for supporting uplink data transmission through the contention-based uplink channel,
The terminal receives an uplink grant message including allocation information on a contention-based uplink channel from a base station through the receiving module,
The first uplink data, which is distinguished from the second uplink data transmitted by another terminal through the contention-based uplink channel through the contention-based uplink channel, is transmitted to the base station using the transmission module. Terminal. A base station receiving first uplink data through a contention-based uplink channel,
A transmission module for transmitting a channel signal;
A receiving module for receiving a channel signal; And
Including a processor for supporting uplink data reception through the contention-based uplink channel,
The base station transmits an uplink grant message including allocation information on a contention-based uplink channel to a first terminal through the transmission module,
The first terminal through the receiving module, the first uplink data, which is distinguished from the second uplink data transmitted by the second terminal through the contention-based uplink channel through the contention-based uplink channel; Receiving from the base station.

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