KR20100034165A - Method of transmitting bsr and deciding priority on bsr transmission - Google Patents

Abstract

PURPOSE: A method of transmitting a BSR(Buffer Status Report) and determining priority during a BSR transmission is provided to prevent the waste of wireless resources and transmission delays when it is difficult for a terminal to immediately send a BSR and control planar data. CONSTITUTION: A UE(User Equipment) transmits a UE(User Equipment) to a network to receive a necessary wireless resource(S1130). The UE receives a transmission block using a wireless resource to control planar data and a BSR transmission(S1140). The UE compares the size of a transmission block, control planar data and the size of a BSR(S1150). When the capacity of the control planar data and BSR is larger than a transmission block, the UE transmits both the control planar data and BSR to the transmission block(S1160).

Description

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The present invention relates to a wireless communication system. More particularly, the present invention relates to a buffer status report (BSR) and control plane data for allocating radio resources for uplink data transmission in a wireless communication system.

3rd generation partnership project (3GPP) mobile communication systems based on wideband code division multiple access (WCDMA) wireless access technology are widely deployed around the world. High Speed Downlink Packet Access (HSDPA), which can be defined as the first evolution of WCDMA, provides 3GPP with a highly competitive wireless access technology in the mid-term future. However, as the demands and expectations of users and operators continue to increase, and the development of competing wireless access technologies continues to progress, new technological evolution in 3GPP is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are demanding requirements.

When the data is to be transmitted in the uplink, the terminal reports the buffer status to the base station in order to request radio resources for transmitting the uplink data.

The buffer status report is a procedure for informing the base station of information about how much data is in the uplink buffer of the terminal. The buffer status report message is a message transmitted by the terminal to report the buffer status of the terminal to the network, and is one of MAC control elements. Hereinafter, the "buffer status report message" or "the MAC control element transmitted by the terminal to report the buffer status" will be simply referred to as BSR.

The BSR is defined by the terminal and is transmitted to the network when the buffer status report is triggered by the terminal. The BSR includes information on priority of uplink data to be transmitted and information on the amount of data occupying a buffer. The BSR may be transmitted by PHY (physical) signaling or Media Access Control (MAC) signaling.

For example, the terminal may update the buffer capacity when it is required to transmit control plane data (C-Plane Data, Service Request Block, which is simply referred to as SRB in the drawing) from the network. When the buffer capacity of the terminal is updated, the above-described BSR is triggered.

However, the terminal without the allocated radio resource receives the radio resource through a scheduling request (Scheduling Request). The terminal receives information on a radio resource to be allocated by the terminal through the uplink grant, that is, information on a transport block. The terminal transmits the control plane data and the BSR through the transport block.

However, if sufficient radio resources are not granted to report the buffer status while transmitting the control plane data, the UE may preferentially transmit either the control plane data or the BSR.

However, according to the prior art, the priority between the user plane data and the BSR is specified, whereas the priority between the control plane data and the BSR is not specified. Therefore, if the allocated resources are insufficient to transmit both, one of the control plane data and the buffer status report message is repeatedly attempted to be transmitted, and the other causes the problem of delayed transmission.

In addition, the terminal waits for the timer for the BSR to expire and resends a scheduling request when the timer expires, in order to retransmit the control plane data and the buffer status report message that have not yet been transmitted. The terminal repeats the process of receiving the uplink grant according to the scheduling request and attempting to transmit the control plane data and the buffer status report message. This also causes a problem of wasting radio resources.

An embodiment of the present invention is to provide a method for preventing transmission delay and waste of radio resources when the BSR and control plane data are difficult to transmit at a time due to insufficient radio resources allocated by the terminal.

The BSR transmission method according to an aspect of the present invention comprises the steps of: transmitting a scheduling request message to a network for allocating radio resources required for transmission of control plane data and reporting buffer status, allocating a transport block according to the scheduling request; Comparing the size of the BSR and control plane data to be transmitted for the buffer status report with the size of the transport block; and if the size of the transport block is greater than or equal to the size of the control plane data, transmitting the control plane data to the transport block. Loading first, and if the size of the transport block is smaller than the control plane data, loading the BSR first on the transport block and transmitting the same.

In addition, the BSR transmission prioritization method according to an aspect of the present invention comprises the steps of transmitting a scheduling request to the network to receive the control plane data and radio resources required for the transmission of the BSR for reporting the buffer status of the terminal, the scheduling Receiving size information of a transport block to be allocated according to a request, and determining a priority between the control plane data and the BSR indicating which of the control plane data and the BSR are to be transmitted in priority according to the size of the transport block; It includes the step of, wherein the one of the BSR and the control plane data, having the priority according to the priority, characterized in that the first transmission to the transport block.

According to an embodiment of the present invention, when control plane data and BSR are contended, both can be transmitted without transmission delay. In addition, it is possible to reduce the waste of radio resources due to repetitive transmission or transmission attempt of control plane data and BSR.

1 is a block diagram illustrating a wireless communication system. This may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system may be referred to as a Long Term Evolution (LTE) system. Wireless communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.

Referring to FIG. 1, an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) includes a base station (BS) 20 that provides a control plane and a user plane.

The UE 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like. The base station 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.

One or more cells may exist in one base station 20. An interface for transmitting user traffic or control traffic may be used between the base stations 20. Hereinafter, downlink means communication from the base station 20 to the terminal 10, and uplink means communication from the terminal 10 to the base station 20.

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to an Evolved Packet Core (EPC), more specifically, a Mobility Management Entity (MME) and a Serving Gateway (S-GW) 30 through an S1 interface. The S1 interface supports a many-to-many-relation between the base station 20, the MME, and the S-GW 30.

2 is a block diagram illustrating a functional split between an E-UTRAN and an EPC. The hatched box represents the radio protocol layer and the white box represents the functional entity of the control plane.

Referring to FIG. 2, the base station performs the following function. (1) Radio resource management such as radio bearer control, radio admission control, connection mobility control, and dynamic resource allocation to a terminal RRM), (2) Internet Protocol (IP) header compression and encryption of user data streams, (3) routing of user plane data to S-GW, and (4) paging messages. Scheduling and transmission, (5) scheduling and transmission of broadcast information, and (6) measurement and measurement report setup for mobility and scheduling.

The MME performs the following functions. (1) Non-Access Stratum (NAS) signaling, (2) NAS signaling security, (3) Idle mode UE Reachability, (4) Tracking Area list management , (5) Roaming, (6) Authentication.

S-GW performs the following functions. (1) mobility anchoring, (2) lawful interception.

P-GW (P-Gateway) performs the following functions. (1) terminal IP (allocation) allocation (allocation), (2) packet filtering.

3 is a block diagram illustrating elements of a terminal. The terminal 50 includes a processor 51, a memory 52, an RF unit 53, a display unit 54, and a user interface unit 55. . The processor 51 is implemented with layers of the air interface protocol to provide a control plane and a user plane.

The functions of each layer may be implemented through the processor 51. The memory 52 is connected to the processor 51 to store a terminal driving system, an application, and a general file. The display unit 54 displays various information of the terminal, and may use well-known elements such as liquid crystal display (LCD) and organic light emitting diodes (OLED). The user interface unit 55 may be a combination of well-known user interfaces such as a keypad or a touch screen. The RF unit 53 is connected to a processor and transmits and / or receives a radio signal.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which is well known in communication systems. (Second layer) and L3 (third layer). Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and is a radio resource control (RRC) layer located in the third layer. The role of controlling the radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the UE and the network.

4 is a block diagram illustrating a radio protocol architecture for a user plane. 5 is a block diagram illustrating a radio protocol structure for a control plane. This shows the structure of the air interface protocol between the terminal and the E-UTRAN. The data plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

A physical layer (PHY), which is a first layer, provides an information transfer service to a higher layer by using a physical channel. The physical layer is connected to the upper Media Access Control (MAC) layer through a transport channel, and data between the MAC layer and the physical layer moves through this transport channel. Data moves between physical layers between physical layers, that is, between physical layers of a transmitting side and a receiving side.

The MAC layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. In the RLC layer, there are three operation modes according to a data transmission method: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). The AM RLC provides a bidirectional data transmission service, and supports retransmission when an RLC Protocol Data Unit (PDU) fails to transmit.

The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce the IP packet header size.

The radio resource control (RRC) layer of the third layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers (RBs). RB means a service provided by the second layer for data transmission between the UE and the E-UTRAN. If there is an RRC connection (RRC Connection) between the RRC of the terminal and the RRC of the network, the terminal is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode.

The non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.

6 shows a mapping between a downlink logical channel and a downlink transport channel. In this regard, the 3GPP TS 36.300 V8.3.0 (2007-12) Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; See section 6.1.3.2 of Stage 2 (Release 8).

Referring to FIG. 6, a paging control channel (PCCH) is mapped to a paging channel (PCH), and a broadcast control channel (BCCH) is mapped to a broadcast channel (BCH) or a downlink shared channel (DL-SCH). Common Control Channel (CCCH), Dedicated Control Channel (DCCH), Dedicated Traffic Channel (DTCH), Multicast Control Channel (MCCH) and Multicast Traffic Channel (MTCH) are mapped to DL-SCH. MCCH and MTCH are also mapped to MCH (Multicast Channel).

Each logical channel type is defined by what kind of information is transmitted. There are two types of logical channels: control channels and traffic channels.

The control channel is used for transmission of control plane information. BCCH is a downlink channel for broadcasting system control information. PCCH is a downlink channel that transmits paging information and is used when the network does not know the location of the terminal. CCCH is a channel for transmitting control information between the terminal and the network, and is used when the terminal does not have an RRC connection with the network. The MCCH is a point-to-multipoint downlink channel used for transmitting multimedia broadcast multicast service (MBMS) control information and is used for terminals receiving MBMS. DCCH is a point-to-point one-way channel for transmitting dedicated control information between the terminal and the network, and is used by a terminal having an RRC connection.

The traffic channel is used for transmission of user plane information. DTCH is a point-to-point channel for transmitting user information and exists in both uplink and downlink. MTCH is a point-to-many downlink channel for transmission of traffic data, and is used for a terminal receiving an MBMS.

Transport channels are classified according to how and with what characteristics data is transmitted over the air interface. The BCH has a predefined transmission format that is broadcast and fixed in the entire cell area. The DL-SCH supports hybrid automatic repeat request (HARQ), support for dynamic link adaptation by changing modulation, coding and transmission power, possibility of broadcasting, possibility of beamforming, and dynamic / semi-static resources. It is characterized by allocation support, discontinuous reception (DRX) support for UE power saving, and MBMS transmission support. PCH is characterized by DRX support for terminal power saving and broadcast to the entire cell area. The MCH is characterized by broadcast to the entire cell and MBMS Single Frequency Network (MBSFN) support.

7 shows a mapping between a downlink transport channel and a downlink physical channel. In this regard, see section 5.3.1 of 3GPP TS 36.300 V8.3.0 (2007-12).

Referring to FIG. 7, a BCH is mapped to a physical broadcast channel (PBCH), an MCH is mapped to a physical multicast channel (PMCH), and a PCH and DL-SCH are mapped to a physical downlink shared channel (PDSCH). PBCH carries the BCH transport block, PMCH carries the MCH, and PDSCH carries the DL-SCH and PCH.

There are several downlink physical control channels used in the physical layer.

The physical downlink control channel (PDCCH) informs the UE of resource allocation of the PCH and DL-SCH and HARQ information related to the DL_SCH. The PDCCH may carry an uplink scheduling grant informing the UE of resource allocation of uplink transmission.

The physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs and is transmitted every subframe. PHICH (physical Hybrid ARQ Indicator Channel) carries a HARQ ACK / NAK signal in response to uplink transmission.

Hereinafter, the Buffer Status Report (BSR) will be described.

The buffer status report is a procedure for informing the base station of information about how much data is in the uplink buffer of the terminal. The BSR is defined by the terminal and is transmitted to the network when the BSR is triggered in the terminal. Four examples are used to explain the events that trigger BSR.

The BSR is triggered when any of the following events occur.

It is triggered when the uplink data arriving at the transmission buffer of the UE belongs to a logical panel having a higher priority than any other data already present in the buffer, or when the serving cell is changed. The BSR in this case is called regular BSR.

Alternatively, the BSR is triggered even when the periodic BSR timer expires. The BSR in this case is called periodic BSR. The BSR may be triggered even when the number of padding bits of the uplink radio resource allocated to the terminal is larger than the size of the BSR. The BSR triggered by the number of padding bits is called the padding BSR.

FIG. 8 is an example of a MAC PDU, FIG. 9 shows a Short BSR format, and FIG. 10 shows a long BSR format.

Referring to FIG. 8, a MAC PDU (or transport block (TB)) includes a MAC header, a MAC SDU, a MAC control element, and padding. The size of the MAC PDU may be defined in units of bytes. MAC header and MAC SDU have a variable size. The MAC header includes at least one MAC PDU subheader, each subheader corresponding to one MAC SDU or one MAC control element or padding. The MAC control element, MAC SDU and padding together are also referred to as MAC payload. The MAC PDU subheader contains six fields: R, R, E, LCID, F, L, except for the last subheader of the MAC PDU and the MAC control element of fixed size. The last subheader of the MAC PDU and the fixed size MAC control element contain four fields: R, R, E, LCID. The field LCID is a field for identifying a logical channel corresponding to the MAC SDU. That is, the LCID is mapped to the RLC entity on the logical channel. There is one LCID per MAC SDU included in the MAC PDU.

9 and 10 show the format of the BSR. There are two types of BSR, short and long, depending on their length. 9 shows a short BSR format, and FIG. 10 shows a long BSR format, respectively.

Referring to FIG. 9, the short BSR format includes one Logical Channel Group Identification (LCG ID) and one Buffer Size field. Referring to FIG. 10, the long BSR format includes four buffer size fields corresponding to LCG IDs # 1 to # 4.

Here, the LCG ID indicates the logical channel group for which the buffer status is reported. The buffer size field indicates the amount of data available in the logical channel constituting the LCG, and the amount of data is in bytes.

In the case of regular BSR and periodic BSR, if one Logical Channel Group has data to be transmitted uplink in the TTI in which the BSR is transmitted, a Short BSR is reported and a BSR is transmitted. If one or more logical channel groups in the TTI have data to be transmitted in the uplink, it reports a long BSR.

For the padding BSR, if the number of padding bits is greater than or equal to the size of the short BSR but less than the size of the long BSR, the short BSR of the LCG including the highest priority logical channel having data to be transmitted on the uplink is reported. If the number of padding bits is greater than or equal to the size of the long BSR, report the long BSR.

When a new BSR is triggered after the transmission of the BSR, when the UE is allocated an uplink radio resource for uplink data transmission during the TTI, instructs a multiplexing and assembly procedure for creating a BSR MAC control element. Restart the periodic BSR timer. If a new regular BSR is triggered after the transmission of the BSR, a scheduling request (SR) is triggered.

In an embodiment of the present invention, the terminal transmits control plane data in the MAC layer according to a request of the RRC. The control plane data is one of the factors that trigger the buffer status report. In the prior art, no priority has been determined regarding the priority between control plane data and BSR. In this case, the priority is a priority for determining which of the two or more messages or data to be transmitted by the terminal is transmitted first in an intact state.

Therefore, the BSR has a higher priority than the control plane data does not necessarily mean that the BSR is transmitted first and then the control plane data is transmitted later, but the entire BSR is as far as possible within the capacity of the transport block. This means that a segment of the control plane data (segmented as s_SRB in the figure) is transmitted on a transport block remaining in the transport block.

When the buffer status report is triggered due to the uplink control plane data, since the BSR and the control plane data exist at the same time, the priority between them is determined in consideration of the size of the transport block.

That is, if the size of the transport block is larger than the sum of the capacity of the control plane data and the BSR, both the control plane message and the BSR are simultaneously transmitted through the same transport block.

If the size of the transport block is larger than the control plane message and smaller than the combined capacity of the control plane message and the BSR, all of the control plane messages are transmitted first. If there is the remaining capacity with the control plane message, the segment of the BSR can be transmitted together.

And if the size of the transport block is smaller than the control plane message, all of the BSRs are transmitted first. If there is capacity remaining on the BSR, the segments of the control plane data can be transmitted together.

11 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention. 11 illustrates a method of transmitting BSR and control plane data when the size of a transport block is larger than the sum of the capacity of the control plane data and the BSR.

Control plane data arrives at the MAC layer of the terminal (S1110). Accordingly, the buffer status report event is triggered (S1120). When a predetermined event occurs, the buffer status report of the terminal is triggered. Since the events that trigger the buffer status report have already been described above, a duplicate description will be omitted. Thereafter, the terminal transmits the BSR and control plane data for reporting the buffer status.

When the buffer status report event is triggered, the terminal should transmit a BSR to report the buffer status to the network. BSR means a mac control element that contains the capacity of the buffer of the terminal.

In order for the terminal to transmit control plane data and BSR to the network, the terminal must be allocated radio resources. The terminal transmits a scheduling request message to the network in order to be allocated the necessary radio resources (S1130).

The network receiving the scheduling request message from the terminal transmits an uplink grant to the terminal through the PDCCH to allocate radio resources to the terminal. That is, the terminal is allocated a transport block as a radio resource for control plane data and BSR transmission (S1140).

The terminal compares the size of the allocated transport block (Size_TB) and the size of the data to be transmitted. That is, the capacity that can be transmitted at one time through the transport block and the control plane data (Size_SRB) and the capacity (Size_BSR) of the BSR are compared with each other (S1150).

As a result of the comparison, if the size of the transport block is larger than the capacity of the sum of the control plane data and the BSR, the terminal transmits both the control plane data and the BSR through the transport block (S1160).

12 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention. 12 shows a BSR and a control plane data transmission method when the size of a transport block is smaller than the control plane message.

Since S1210 to S1240 are the same as S1110 to S1140 described with reference to FIG. 11, description thereof is omitted.

The terminal compares the size of the allocated transport block (Size_TB) and the size of the data to be transmitted. That is, the capacity that can be transmitted at one time through the transport block and the control plane data (Size_SRB) and the capacity (Size_BSR) of the BSR are compared with each other (S1250).

As a result of the comparison, when the capacity of the transport block is larger than the capacity of the control plane data but smaller than the capacity of the combined control plane data and the BSR, the control plane data has a high priority. Therefore, only the control plane data can be transmitted first. Therefore, control plane data having priority is transmitted first (S1260). If there is a capacity remaining after carrying the entire control plane data, a part of the BSR, that is, a segment of the BSR may be transmitted together with the control plane data through the transport block to the extent possible. The remaining BSR is transmitted by the terminal reassigning a transport block (S1270).

13 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention. FIG. 13 illustrates a method of transmitting BSR and control plane data when the size of a transport block is larger than the control plane message and smaller than the combined capacity of the control plane message and the BSR.

Since S1310 to S1340 are the same as S1110 to S1140 described with reference to FIG. 11, description thereof will be omitted.

The terminal compares the size of the allocated transport block (Size_TB) and the size of the data to be transmitted. That is, the capacity that can be transmitted at one time through the transport block and the control plane data (Size_SRB) and the capacity (Size_BSR) of the BSR are compared with each other (S1350).

As a result of the comparison, when the capacity of the transport block is larger than that of the BSR but smaller than that of the control plane data, the BSR has a high priority. Therefore, only the entire BSR can be transmitted first (S1360). In addition, if there is a capacity remaining after carrying the entire control plane data, a part of the control plane message, that is, a segment of the control plane data may be transmitted through the transport block together with the BSR to the extent possible.

Meanwhile, the network receiving the BSR allocates radio resources to the terminal again based on the BSR (S1370). The network transmits an uplink grant to the terminal through a PDCCH. The terminal transmits segments of the control plane data through the newly allocated radio resource (S1380). If there is a segment of the remaining control plane data, the terminal is further allocated radio resources for the remaining control plane data (S1390).

14 is a diagram illustrating a method of determining the priority between a BSE and control plane data according to an embodiment of the present invention.

First, in order for the terminal to transmit control plane data and report the buffer status, radio resources must be allocated. Accordingly, the terminal transmits a scheduling request to the network in order to be allocated radio resources necessary for transmission of control plane data and BSR (S1410).

The network allocates a transport block as a radio resource to the terminal according to the scheduling request of the terminal, and first transmits information about the transport block to the terminal (S1420). The information about the transport block includes information indicating the size of the transport block to be allocated to the terminal.

Upon receiving the information about the size of the transport block to be allocated, the terminal determines the priority in the transmission between the control plane data and the BSR using the information about the size of the transport block (S1430).

The terminal may determine the priority by comparing the size of the transport block, the control plane data, and the size of the BSR. That is, if the size of the transport block is greater than or equal to the size of the control plane data as a result of the comparison, the terminal determines the priority as having the control plane data with the priority and the BSR having the next priority. On the other hand, if the size of the transport block is smaller than the size of the control plane data, the BSR has a priority and the control plane data has a priority.

When the priority is determined, the UE first puts one of the control plane data and the BSR in priority in the transport block according to the priority. In other words, priority has a meaning as a criterion for determining what to transmit first, as described above, but also as a criterion for determining which one is to be sent uncut when the capacity of the transport block is insufficient. .

If the size of the transport block is greater than the control plane data and the control plane data has a priority, the terminal first transmits the control plane data to the transport block. In addition, radio resources are allocated to transmit BSR. Of course, if the size of the transport block is larger than the sum of the control plane data and the BSR, both of them may be simultaneously loaded in one transport block and transmitted.

On the other hand, when the size of the transport block is smaller than the control plane data and the BSR has a priority, the UE first loads the BSR in the transport block. If there is a remaining capacity in the transport block carrying the BSR, only the remaining capacity is loaded with segments of the control plane data and transmitted together with the BSR. If there is no capacity to carry more data in the transport block due to BSR, the control plane data is transmitted through another newly allocated transport block.

After the terminal transmits only a part of the control plane data segments, the remaining control plane data segments are further allocated with another transport block and transmitted.

The invention can be implemented in hardware, software or a combination thereof. In hardware implementation, an application specific integrated circuit (ASIC), a digital signal processing (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, and a microprocessor are designed to perform the above functions. , Other electronic units, or a combination thereof. In the software implementation, the module may be implemented as a module that performs the above-described function. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

1 is a block diagram illustrating a wireless communication system.

2 is a block diagram illustrating a functional split between an E-UTRAN and an EPC.

3 is a block diagram illustrating elements of a terminal. 4 is a block diagram illustrating a radio protocol architecture for the user plane.

5 is a block diagram illustrating a radio protocol architecture for a control plane.

6 illustrates a mapping between a downlink logical channel and a downlink transport channel.

7 illustrates mapping between a downlink transport channel and a downlink physical channel.

8 illustrates an example of a MAC PDU.

9 illustrates a Short BSR format.

10 illustrates a long BSR format.

11 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention.

12 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention.

13 is a flowchart illustrating a method of transmitting BSR and control plane data according to an embodiment of the present invention.

14 is a diagram illustrating a method for determining priority between a BSE and control plane data according to an embodiment of the present invention.

Claims (10)

Transmitting a scheduling request message to a network for allocating radio resources necessary for transmission of control plane data and reporting buffer status; Receiving a transport block according to the scheduling request; Comparing the size of the transport block with the size of the BSR and control plane data to be transmitted for reporting the buffer status; And If the size of the transport block is greater than or equal to the size of the control plane data, the control plane data is loaded on the transport block first. If the size of the transport block is smaller than the control plane data, the BSR is first loaded on the transport block. BSR transmission method comprising the step of transmitting. The method of claim 1, When the size of the transport block is larger than the capacity of the sum of the control plane data and the BSR, the control plane data and the BSR are both loaded in the transport block and transmitted, and the size of the transport block is the size of the control plane data. If greater than or equal to and less than the capacity of the sum of the control plane data and the BSR, the control plane data, characterized in that the first transmission to the transport block BSR transmission method. The method of claim 2, Sending a scheduling request; Receiving another transport block according to the scheduling request; And And transmitting the unsent BSR to the other transport block. The method of claim 1, If the size of the transport block is greater than or equal to the BSR and smaller than the control plane data, the BSR is first loaded on the transport block, and the segment of the control plane data is transmitted within the limits of the capacity of the transport block. BSR transmission method characterized by. The method of claim 4, wherein Sending a scheduling request; Receiving another transport block according to the scheduling request and the BSR; And And transmitting remaining segments of the control plane data, which have not been transmitted, to the other transport block. Transmitting a scheduling request to a network in order to be allocated radio resources required for transmission of control plane data and a BSR for reporting a buffer status of the terminal; Receiving size information of a transport block to be allocated according to the scheduling request; Determining a priority between the control plane data and the BSR indicating which of the control plane data and the BSR are to be transmitted in priority according to the size of the transport block; And among the BSR and the control plane data, any one having the priority according to the priority is first transmitted to the transport block and then transmitted. The method of claim 6, Comparing the size of the transport block with the size of the control plane data and the BSR; And By assigning a priority to the control plane data when the size of the transport block is greater than or equal to the size of the control plane data, and by assigning a priority to the BSR when the size of the transport block is smaller than the size of the control plane data A method of determining priorities in BSR transmission further comprising the step of determining priorities. The method of claim 7, wherein And when the BSR has the priority, the segment of the control plane data is transmitted along with the BSR only when there is a capacity remaining after the BSR is loaded in the transport block. The method of claim 8, If there is a segment remaining untransmitted among the control plane data, the remaining segment is transmitted through another allocated transport block after the BSR is transmitted, characterized in that the prior to the BSR transmission method. The method of claim 6, And when the control plane data has the priority, the BSR has a subordinated priority, and after the control plane data is transmitted, it is transmitted through another newly allocated transport block.

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