KR20160150138A

KR20160150138A - Methods for transmittion uplink data

Info

Publication number: KR20160150138A
Application number: KR1020150086381A
Authority: KR
Inventors: 홍성표; 최우진
Original assignee: 주식회사 케이티
Priority date: 2015-06-18
Filing date: 2015-06-18
Publication date: 2016-12-29

Abstract

The present invention relates to a method and apparatus for uplink transmission in a mobile communication network. In particular, the invention relates to a method for a terminal to transmit uplink data, comprising the steps of activating an SPS radio resource for reducing uplink transmission delay and performing an uplink transmission using the SPS period And an apparatus.

Description

[Technical Field] The present invention relates to a method for transmitting uplink data,

The present invention relates to a method and apparatus for uplink transmission in a mobile communication network.

The present invention provides a method for a terminal to transmit uplink data, comprising the steps of activating an SPS radio resource to reduce an uplink transmission delay and performing an uplink transmission using the SPS period Lt; / RTI >

1 is a diagram for explaining a radio access delay element for a typical uplink transmission.
2 is a diagram for explaining the SPS configuration information (SPS-Config).
3 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
4 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) a device itself providing a megacell, a macrocell, a microcell, a picocell, a femtocell, or a small cell in relation to a wireless region, or ii) the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In a system such as LTE and LTE-A, the uplink and downlink are configured based on one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmission / reception points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

In the conventional mobile communication technology, in order to perform an uplink data transmission (active terminal and / or a terminal that has been inactive for a long period of time but retains RRC Connected), it is necessary to perform the uplink data transmission due to the operation of the procedure for performing uplink data transmission There was a delay.

Fig. And is a diagram for explaining a radio access delay element for a typical uplink transmission.

Figure 1 illustrates typical wireless access uplink transmission delay factors for terminals that do not have a valid uplink grant. First, the uplink transmission delay depends on the SR period. If the SR period has the smallest value (1 ms), a delay for the waiting time of 0.5 ms occurs. Assuming that the SR period is 10 ms as shown in FIG. 1, a delay for the waiting time of 5 ms occurs.

A delay of 1 ms occurs when the UE requests the base station for scheduling through the SR procedure and a delay of 3 ms occurs for generating the scheduling grant by decoding the scheduling request at the base station and a delay of 1 ms occurs when the base station transmits the scheduling grant. The UE also generates a delay of 4ms for decoding the scheduling grant and transmitting the data.

A method for reducing the delay in receiving a scheduling grant by requesting a scheduling request from a base station through an SR (Scheduling Request) procedure, is a method for pre-allocating a scheduling grant to a terminal when resources are available I can think about it. However, it has a disadvantage in that it can increase the PDCCH load by generating the scheduling grant through the PDCCH in advance, or the UE can be scheduled when there is no data to be sent by the UE, thereby consuming the battery of the UE.

Persistent scheduling (SPS) can be considered as a method for solving the problem of delay occurrence according to the SR procedure or the disadvantage of PDCCH load increase according to the pre-allocation method. SPS is introduced for efficient resource allocation for VoIP traffic with the same size and regular transmission time interval for a relatively long time. When the SPS is configured, the UE as described above can request a scheduling request from the base station through the SR procedure, thereby reducing a delay in receiving the scheduling grant and preventing a PDCCH load increase. However, current SPS technology is provided over a fixed time interval of more than 10ms.

As described above, uplink transmission according to the related art can cause a fixed delay, and methods for improving the same can also effectively increase uplink data transmission delay by increasing the PDCCH load or providing only a fixed time interval of 10 ms or more There was a difficult problem to use.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resource allocation method and apparatus for effectively reducing an uplink transmission delay.

As described above, the SPS of the prior art has been introduced and used as a resource allocation method for reducing the load on the PDCCH for VoIP traffic that transmits data packets of the same size at a constant period for a relatively long time. In order for the UE to use the SPS, the UE must first know the SPS radio resource allocation period and know the coding information or frequency information of the allocated radio resource. The base station uses RRC signaling and PHY signaling to transmit this information to the UE. For example, using the RRC message, the UE receives periodic information (semiPersistSchedIntervalUL) for allocating SPS radio resources for the uplink SPS configuration, empty number information for implicit release (implicitReleaseAfter), etc., and uses PDCCH And receives frequency information and transmission attribute information (modulation and coding scheme).

SPS-C-RNTI is used for SPS resource allocation. The UE uses an NDI (New Data Indicator) field, which is transmitted through the resource assignment information via the PDCCH, in order to distinguish the activation of radio resources for the SPS from the HARQ retransmission for the SPS.

The NDI field is set to zero to activate the radio resource for the SPS. When the UE receives the resource allocation information masked by the SPS-C-RNTI with the NDI field set to 0, the UE stores the received resource allocation information and periodically transmits the radio resource indicated by the information stored for transmission of the MAC PDU Lt; / RTI >

On the other hand, if the UE receives the resource allocation information masked by the SPS-C-RNTI with the NDI field set to 1, the UE does not use the stored radio resource. However, it uses the received radio resource for transmission of the MAC PDU.

Reactivation for the SPS is performed in the same manner as activation for the SPS.

When the UE sets the NDI field to 0 and receives the resource allocation information masked with the SPS-C-RNTI, the UE replaces the stored information with the newly received radio resource information.

When the SPS is activated, the radio resources for the SPS are wasted if there is no data to send.

The UE can explicitly release the SPS by receiving the resource allocation information masked by the SPS-C-RNTI including the indication for releasing the radio resources for the SPS. In addition to the explicit SPS for the uplink, when a certain number of MAC PDUs (implicitReleaseAfter) that does not include any MAC SDU in the radio resource for the SPS are continuously transmitted, the UE implicitly allocates radio resources for the SPS Can be released. That is, when the SPS is activated, if there is no data to send, the UE transmits a MAC PDU that does not include any MAC SDU. If the MAC PDUs of a certain number (implicitReleaseAfter) that does not include the MAC SDU are continuously transmitted, Lt; / RTI > can be implicitly released.

The SPS can be used for the UE to reduce the uplink transmission delay. This may be a resource allocation scheme to which the advanced function according to the present invention is applied in addition to the SPS of the prior art. For convenience of explanation, the resource allocation scheme for applying the uplink transmission delay reduction method according to the present invention will be described below. And is referred to as SPS for reducing link transmission delay. This is for convenience of explanation and it is also possible to use another term having a similar concept.

The base station can configure SPS configuration information for reducing the uplink transmission delay through the RRC message in the UE. For example, the SPS configuration information for reducing the uplink transmission delay may be included in the SPS configuration information (SPS-Config) of the prior art. For example, in the sub-configuration information in the conventional SPS configuration information. For example, it can be included in SPS-ConfigUL. As another example, it may be defined by defining other configuration information (for example, SPS-Config-UP-LR: Up Link Latency Reduction) different from SPS-ConfigUL. As another example, the SPS configuration information for reducing the uplink transmission delay may be defined as other level information (SPS-UP-LR-Config, for example) at the same level as the conventional SPS configuration information.

2 is a diagram for explaining the SPS configuration information (SPS-Config).

2, the conventional SPS configuration information includes SPS-C-RNTI information (semiPersistSchedC-RNTI), downlink SPS configuration information (sps-ConfigDL), and uplink SPS configuration information (sps-ConfigUL) do.

In the prior art, a terminal can use only one uplink SPS configuration. Therefore, according to the present invention, SPS configuration information for another uplink resource allocation (distinguished from existing uplink SPS configuration information (sps-ConfigDL)) for reducing the uplink transmission delay can not be configured and used .

To solve this problem, the following methods can be used individually or in combination.

When an uplink transmission occurs, the SPS radio resource for decreasing the uplink transmission delay is released

When the SPS configuration information for reducing the uplink transmission delay is configured in the UE, the UE transmits period information (semiPersistSchedIntervalUL) to which the radio resource is allocated for the uplink SPS configuration included in the conventional uplink SPS configuration information (sps-ConfigUL) And a period in which radio resources are allocated to reduce an uplink transmission delay (hereinafter referred to as semiPersistSchedIntervalUL-LR for convenience of description) may be set differently. For example, a period (semiPersistSchedIntervalUL-LR) in which radio resources are allocated to reduce an uplink transmission delay for starting a fast uplink transmission is less than a period (semiPersistSchedIntervalUL) in which radio resources are allocated for uplink SPS configuration for VoIP Value (e.g., 1 ms, 2 ms, 4 ms, etc.). The period (semiPersistSchedIntervalUL) in which the radio resources are allocated for the uplink SPS configuration in the current E-UTRAN can be set to a value of (10ms, 20ms, 32ms, 40ms, 64ms, 80ms).

When the UE receives the resource allocation information masked by the SPS-C-RNTI with the NDI field set to 0, the UE stores the received resource allocation information and periodically transmits the radio resource indicated by the information stored for transmission of the MAC PDU Lt; / RTI >

Hereinafter, the terminal may refer to a MAC entity of a terminal performing a resource allocation operation in a terminal or a controller of a terminal instructing a MAC entity operation of the terminal.

The UE may activate the SPS radio resource to reduce the uplink transmission delay. That is, an uplink transmission may be attempted using the SPS period for reducing the uplink transmission delay.

An example of the detailed operation is as follows.

If the serving cell is a special cell (SpCell) and the uplink grant is received on the SpCell PDCCH with the SPS-C-RNTI of the MAC entity (i.e., if the Serving Cell is the SpCell and if an uplink grant for this TTI the HARQ information is 0 in the received NDI information, and the PDCCH content is transmitted to the SPS release (S-RNTI) (Else), < / RTI >

The UE stores the HARQ information associated with the uplink grant in a configured uplink grant (the uplink grant and the associated HARQ information as configured uplink grant).

The terminal restarts (if not active) the configured uplink grant to start in this TTI (if it is not active) or resumes the uplink grant that is configured to start in this TTI (if it is already active). And repeats according to a period (semiPersistSchedIntervalUL-LR) in which radio resources are allocated to reduce the uplink transmission delay. (Initialize (if not active) or re-initialise (if already active) and to recur according to rules.

The UE considers that the NDI bit for the corresponding HARQ process is toggled.

The MS transmits the HARQ information associated with the uplink grant to the HARQ entity.

For each TTI, if an uplink grant is indicated for that TTI, the HARQ entity identifies the HARQ process for which the transmission will occur.

If the uplink grant is directed to this process in this TTI,

If the received grant does not address the Temporay C-RNTI on the PDCCH and the NDI provided in the associated HARQ information has been toggled with respect to the value before the previous HARQ process transmission (if the received grant was not addressed to a Temporary C-RNTI the PDQCH and the NDI provided in the associated HARQ process have been toggled compared to the value in the previous transmission of the HARQ process)

The HARQ entity obtains the MAC PDU from the Multiplexing and Assembly entity (obtain the MAC PDU to transmit from the "Multiplexing and Assembly" entity).

The HARQ entity delivers the MAC PDU, the uplink grant, and the identified HARQ process.

The HARQ entity instructs the identified HARQ process to trigger a new transmission.

If the MAC PDU is not obtained, or if the MAC PDU containing the MAC SDU is not obtained, or if the MAC data to be sent is not obtained or if no data is to be sent, or if there is no data to be sent to the multiplexing and assembly entity, the HARQ entity ignores / removes the uplink grant / Unset / flush.

The UE activates and uses SPS radio resources to reduce uplink transmission delay. That is, when the terminal is configured with the SPS configuration information for reducing the conventional uplink SPS configuration information (sps-ConfigUL) and / or the uplink transmission delay, the terminal sets the NDI field to 0 and sets the SPS-C-RNTI Upon receiving the masked resource allocation information, the UE stores a received resource allocation information and a period (semiPersistSchedIntervalUL-LR) in which radio resources are allocated according to the SPS configuration information for reducing an uplink transmission delay with a low radio resource allocation period It is possible to periodically use the radio resources indicated by the information stored for transmission of the MAC PDU.

In this case, when there is no data to be transmitted to the UE, sending a MAC PDU not including the MAC SDU at a low radio resource allocation period consumes the battery of the UE, which is not preferable. Accordingly, if there is no data to be transmitted to the UE during operation of the uplink transmission period (semiPersistSchedIntervalUL-LR) according to the SPS configuration information for reducing the uplink transmission delay (or there is no data in the multiplexing and assembly entity) It is possible to prevent the MAC PDU from being transmitted.

An example of this is as follows.

If the MAC PDU is obtained while using the SPS uplink grant to reduce the uplink transmission delay (if the MAC PDU including the MAC SDU is obtained or the MAC data to be sent is obtained)

(If the MAC PDU is not obtained or if the MAC PDU including the MAC SDU is not obtained, or if the MAC data to be sent is not obtained or the data to be sent is not obtained, or if Multiplexing and < RTI ID = 0.0 > If there is no data to send to the assembly entity)

The HARQ entity ignores / removes / releases / flushes the uplink grant of the corresponding TTI.

If the UE performs an uplink transmission while operating with an uplink transmission period (semiPersistSchedIntervalUL-LR) according to the SPS configuration information for reducing the uplink transmission delay, the UE transmits an SPS Resource allocation can be released.

As another example, if the UE performs an uplink transmission during an uplink transmission period (semiPersistSchedIntervalUL-LR) according to the SPS configuration information for reducing the uplink transmission delay and receives the HARQ ACK, The SPS resource allocation for reducing the uplink transmission delay can be released.

An example of this is as follows.

The terminal (MAC entity) clears / releases / removes the configured uplink grant (if present).

I.e., releases the SPS resource allocation for reducing the uplink transmission delay.

When the SPS configuration information for reducing the uplink transmission delay to the UE is configured by the base station, the UE can cause the SPS resource allocation to be released by the uplink transmission or by the PDCCH of the base station to reduce the uplink transmission delay have. However, in order to efficiently utilize the resources, the maximum number of transmission attempts or the maximum timer value for releasing the SPS resource allocation for reducing the uplink transmission delay can be set in the UE. For example, the UE may set the maximum number of transmission attempts or the maximum timer value for releasing the SPS resource allocation to reduce the uplink transmission delay so that unnecessary transmission attempts are not repeated due to malfunction of the terminal.

If the resource allocation for the SPS to reduce the uplink transmission delay is released, the processing for the conventional uplink SPS configuration information (sps-ConfigUL) can be handled in the following manner.

For example, the activation / re-activation / release method using the conventional PDCCH can be used as it is.

Alternatively, the UE may periodically use the radio resource indicated by the information stored for transmission of the MAC PDU according to a period (semiPersistSchedIntervalUL) during which radio resources are allocated for the conventional uplink SPS configuration through the stored resource allocation information have.

In another example, the terminal may release the resource allocation for the conventional uplink SPS.

PDCCH On Uplink To reduce transmission delay SPS Including information indicating

The PDCCH is used to carry downlink control information (DCI) such as scheduling and power control commands. The uplink scheduling grant includes a PUSCH resource indication, a transport format, HARQ related information, and the like.

The base station may configure the SPS configuration information and / or the conventional uplink SPS configuration information (sps-ConfigUL) to reduce the uplink transmission delay to the UE through the RRC message.

The base station may include indication information for distinguishing the SPS radio resources for decreasing the uplink transmission delay so as to activate / deactivate / deactivate the SPS radio resources for reducing the uplink transmission delay on the PDCCH . Or the base station may include information for distinguishing and indicating the SPS radio resource for reducing the uplink transmission delay and the radio resource for the conventional uplink SPS through the PDCCH.

For example, the UE includes indication information for instructing the SPS radio resource to activate the SPS radio resource for reducing the uplink transmission delay. The UE sets the indication information (for example, to 0) to distinguish the SPS radio resources for decreasing the uplink transmission delay (or separately activates), sets the NDI field to 0, and sets the SPS-C- Upon receiving the resource allocation information masked with the RNTI, the UE stores the received resource allocation information and periodically updates the MAC PDU according to the uplink transmission period (semiPersistSchedIntervalUL-LR) according to the SPS configuration information for reducing the uplink transmission delay. And uses the radio resource indicated by the stored information for transmission.

As an example, a more detailed operation is as follows.

If the serving cell is a special cell (SpCell) and the uplink grant to the UE in the TTI is received on the SpCell PDCCH with the SPS-C-RNTI of the MAC entity (if this Serving Cell is the SpCell and if an uplink grant (for example, if the received NDI information is 0 (if the TTI has been received for the SpCell on the PDCCH of the MAC entity's semi-persistent scheduling C-RNTI) If the indication information for distinguishing the SPS radio resources for reducing the uplink transmission delay is 0, and the PDCCH is not release (else)

The UE restarts the configured uplink grant to start at this TTI (if it is not active) or resumes the uplink grant that is to start at this TTI (if it is already active) (If not active) or re-initialise (if already active) according to the semi-persistent scheduling policy (semiPersistSchedIntervalUL-LR).

If the uplink grant is directed to this process in this TTI,

If the MAC PDU is obtained (if the MAC PDU including the MAC SDU is obtained or the MAC data to be sent is obtained)

Otherwise (if you do not get a MAC PDU, or if you do not get a MAC PDU with a MAC SDU, or if you do not get MAC data to send, or if you do not get the data to send, or if there is no data to send to the Multiplexing and Assembly entity)

As described above, when there is no data to be transmitted to the UE during the uplink transmission delay reducing operation, sending a MAC PDU not including the MAC SDU is not preferable because it consumes the battery of the UE. Accordingly, if there is no data to be transmitted to the UE during operation of the uplink transmission period (semiPersistSchedIntervalUL-LR) according to the SPS configuration information for reducing the uplink transmission delay (or there is no data in the multiplexing and assembly entity) It is possible to prevent the MAC PDU from being transmitted.

When the SPS configuration information for reducing the uplink transmission delay is configured in the UE, if the UE sets the NDI field to 0 and receives the resource allocation information masked with the SPS-C-RNTI, the UE transmits the received resource allocation information (SemiPersistSchedIntervalUL-LR) in which radio resources are allocated according to the SPS configuration information for reducing the uplink transmission delay, and periodically attempting to use the radio resource indicated by the information stored for transmission of the MAC PDU have. The operation is as follows.

If the uplink grant is directed to this process in this TTI,

Using RNTI distinguished from SPS-C-RNTI

When the base station instructs to activate / deactivate / deactivate the SPS radio resource for reducing the uplink transmission delay through the PDCCH, the SPS-C-RNTI may be configured to receive the SPS radio resource to distinguish it from the conventional uplink SPS radio resource. And the RNTI is distinguished from the RNTI. For example, the SPS radio resource for reducing the uplink transmission delay can be activated through the masked resource allocation information through the C-RNTI. As another example, a new SPS-LR-C-RNTI may be defined to enable activation / de-activation / deactivation of SPS radio resources for reducing uplink transmission delay through masked resource allocation information

Uplink To reduce transmission delay SPS To SCell How to configure

Conventional SPS was introduced for low-speed services such as VoIP, so transmission over a single component carrier is sufficient and therefore only supported by PCell. In order to reduce the uplink transmission delay, pre-allocation of resources is required, and radio resources for this are required. While PCell is easy to maintain high load mainly for control of multiple terminals in macrocell environment, SCell is likely to have low load because it is mainly used for data boosting for small number of terminals in small cell environment. Therefore, the SPS configuration information for reducing the uplink transmission delay can be applied to SCell and used. Since the small cell has a small cell radius and can keep uplink synchronization for a long time, it is possible to apply the SPS configuration information to the SCell to reduce the uplink transmission delay according to the present invention.

The embodiments described above in the present invention can be used individually or in combination.

As described above, the present invention utilizes semi-persistent scheduling (SPS) without increasing the PDCCH load, thereby allowing the UE to provide fast uplink transmission, thereby increasing the data transmission rate rapidly while reducing the uplink data transmission delay It is effective.

3 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

3, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The control unit 1010 controls the overall operation of the base station according to the provision of the resource allocation method and apparatus for effectively reducing the uplink transmission delay necessary for carrying out the present invention described above.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

4 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

4, a user terminal 1100 according to another embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1120 controls the overall operation of the terminal according to the provision of the resource allocation method and apparatus for effectively reducing the uplink transmission delay necessary for performing the above-described present invention.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and some of the standard documents is added to or contained in the scope of the present invention, as falling within the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims

A method for a terminal to transmit uplink data,
Activating an SPS radio resource to reduce an uplink transmission delay; And
And performing an uplink transmission using the SPS period.