KR101475817B1 - Apparatus and method for pdu delivery in mobile communication system - Google Patents

Abstract

A method for transmitting a RESET PDU and a RESET ACK PDU in a receiver MAC layer of a mobile communication system, the method comprising: analyzing a header included in a first packet in a control PDU transmission method; 2 " or " 3rd " packet, the second packet or the third packet is directly transmitted to the upper layer, and the RESET or RESET ACK PDU transmitted from the transmitter is stalled in the reordering processing process at the receiver There is an advantage that it is possible to prevent a resource loss problem due to unnecessary data transmission which may occur when a normal reset procedure can not be performed due to the occurrence of an error,

RESET PDU, RESET ACK PDU, LTE, HSPA.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for transmitting a PDU in a mobile communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for transmitting a RESET PDU (Packet Data Unit) and a RESET ACK PDU in a mobile communication system, even if another PDU is waiting for transmission in advance.

In 3GPP Release 7 or 8, L2 enhancements have been added for high-speed data processing. In the Medium Access Control (MAC) layer, a MAC data frame including an existing MAC header has been changed, and a segmentation function for adding a MAC-d PDU has been added. A new MAC entity (MAC-ehs, MAC- i / is). In the RLC (Radio Link Control) layer, an existing fixed PDU size is changed to a changeable PDU size, and the size of the RLC PDU can be adjusted up to 1500 bytes.

In the forward link path, the data rate of the terminal is determined by a limited range of power allocated by the base station. In the MAC layer, the PDU size is determined within the range of the power and the maximum / minimum RLC PDU size to request data to the RLC layer. In the RLC layer, the PDU is generated in units of the requested size and is transmitted to the MAC layer do.

The type of PDU transmitted to the MAC layer is a data PDU, a status PDU, and a control PDU. The MAC layer checks the amount of buffer stored in the RLC layer to obtain data to be transmitted in the next TTI (Transmission Time Interval).

The amount of the buffer is a radio bearer unit and is examined in this unit. The information included in the RLC SDU buffer includes the amount of SDU data stored in the RLC SDU buffer, the amount of the retransmission PDU, the newly transmitted PDU, control PDUs.

The RLC layer of the transmitter transmits a data PDU and a control PDU and determines a retransmission or transmits a new PDU according to the result (ACK / NACK). The RLC layer of the receiver processes the received data PDU, and when the control PDU is received, performs the RLC operation according to the content.

These control PDUs are transmitted after reordering processing in the MAC-ehs entity before they are received by the RLC layer. These control PDUs are transmitted together with other data PDUs on the MAC-ehs PDU (in the downlink).

The entity receiving the MAC-ehs PDU delivers the MAC-ehs PDU to the reordering queue according to the MAC-ehs header and performs the reordering process. In the reordering queue, only MAC-ehs PDUs transmitted with consecutive TSNs are transmitted to the disassembly and reassembly entity, which is an upper entity, in order to guarantee in-sequence delivery. If a MAC-ehs PDU with a non-consecutive TSN is received, it is stored in the reordering buffer and is not transferred to the upper functional entity, resulting in a stalling state.

The control PDU including the result of the PDU transmitted from the transmitter is a RESET PDU or a RESET ACK PDU. Since the link status is not good, the RLC layer receives the RLC RESET information as soon as possible and performs the RESET procedure as soon as possible. . Since the transmitter has transmitted a RESET PDU, it transitions to the "RESET pending state" and discards all the received data.

However, even if a RESET PDU or a RESET ACK PDU is received, if a RESET PDU or a RESET ACK PDU can not be provided to the RLC layer while being stowed according to a reordering operation in a MAC-ehs entity, power consumption due to unnecessary data transmission And radio resource loss or call disconnection.

It is an object of the present invention to provide a device and method for transmitting a signal in a mobile communication system.

Another object of the present invention is to transmit a RESET PDU or a RESET ACK PDU to a RLC layer while transmitting a RESET PDU or a RESET ACK PDU in a mobile communication system in a fixed size and stowing in a reordering operation in a MAC- And an apparatus and method for preventing power consumption, radio resource loss, or call drop due to unnecessary data transmission occurring when the mobile station can not provide the mobile station.

According to a first aspect of the present invention, there is provided a method for transmitting a control PDU in a receiver MAC layer of a mobile communication system, comprising the steps of: receiving a packet; determining a packet length of the packet; And transmitting the packet to the upper layer except for reordering when the packet is related to the parameter initialization of the upper layer.

According to a second aspect of the present invention, there is provided a method for transmitting control PDUs in a transmitter RLC layer of a mobile communication system, the method comprising the steps of: Transmitting the packet to a lower layer and transmitting the packet, and when the packet is related to parameter initialization of the upper layer, excluding reordering in a receiver, To the upper layer of the receiver.

According to a third aspect of the present invention, there is provided an apparatus for a MAC layer of a receiver for transmitting a control PDU in a mobile communication system, the apparatus comprising: a receiver for receiving a packet transmitted by a transmitter; And a PDU processing unit for determining whether the packet is related to parameter initialization of an upper layer and for forwarding the packet to the upper layer except for reordering when the packet is related to parameter initialization of the upper layer .

According to a fourth aspect of the present invention, there is provided an apparatus of an RLC layer of a transmitter for transmitting a control PDU in a mobile communication system, the apparatus comprising: And an RLC unit for transmitting the packet to the lower layer, the RLC unit including: a receiving unit for receiving the packet except for reordering in a receiver when the packet is related to parameter initialization of the upper layer; To the upper layer of the mobile station.

The present invention can prevent a resource loss problem due to unnecessary data transmission which may occur when a RESET or RESET ACK PDU transmitted from a transmitter fails to proceed with a normal reset procedure due to stalling during reordering processing at a receiver, There is an advantage that it can be prevented.

The present invention is advantageous in that a RESET PDU or a RESET ACK PDU is directly transmitted to the RLC layer even if stalling occurs in the reordering procedure, thereby performing a reset procedure without delay.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, 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.

Hereinafter, the present invention will be described with respect to an apparatus and a method for transmitting a signal in a mobile communication system.

The present invention defines a RESET or RESET ACK PDU that satisfies a minimal octet (byte) alignment, except for portions that contain unnecessary padding bits in a 3GPP Release 7 or 8 system supporting variable size RLC PDUs.

The present invention is characterized in that the RLC layer forms part of a control PDU (data PDU), an interface part in which the MAC layer requests data to the RLC layer, a MAC layer receives the requested data and generates a MAC-d PDU .

The present invention includes a part for constructing each MAC-ehs PDU by receiving a MAC-d PDU in a MAC-ehs entity (HSDPA). And a part for receiving the MAC-ehs PDU received from the peer entity corresponding to each entity and a part for parsing and transmitting the header of the received data to the reordering queue.

The present invention includes a portion for detecting a fixed size of 32 bits when extracting a RESET PDU or a RESET ACK PDU, extracting the fixed size from the reordering buffer, and transmitting the extracted size to the corresponding RLC layer.

1 is a diagram illustrating a MAC-ehs PDU format according to the present invention.

Referring to FIG. 1, the MAC-ehs PDU includes a 32-bit RESET PDU and a RESET ACK PDU, and the RESET PDU and the RESET ACK PDU are included in the reordering PDU. It can be seen that the header of the MAC-ehs PDU includes the TSN and L fields.

2 is a diagram illustrating a structure of MAC / MAC-ehs in the UTRAN according to the present invention.

The structure of the transmitter will be described with reference to FIG. A RESET PDU is transmitted when a RLC RESET condition occurs in a specific radio bearer of the RLC layer.

Since the size of the RLC PDU is variable in 3GPP Releases 7 and 8, the RLC layer fills only the necessary information with the RESET PDUs, generates 32 bits by byte alignment, and transmits the RESET PDU to the MAC layer.

The MAC layer maps a RESET PDU received from the RLC layer to a MAC-d PDU and delivers the RESET PDU to a MAC-ehs entity. The MAC-ehs entity receives the MAC-d PDU and generates a MAC-ehs PDU including a necessary header.

Finally, the MAC-ehs PDU is transmitted to an opposite entity of the receiver via an HARQ (Hybrid Automatic Repeat reQuest) entity. 2, an LCH-ID (Logical CHanner ID) indicates an ID of a logical channel

3 is a diagram illustrating a structure of MAC / MAC-ehs on the terminal side according to the present invention.

The operation of the receiver will be described with reference to FIG. The MAC-ehs entity of the UTRAN (especially NodeB) receives the MAC-ehs PDU. The MAC-ehs PDU is delivered to the reordering queue of the mapped MAC-d flow, and the reordering queue starts reordering processing according to the TSN of the MAC- ehs header.

In general, the MAC-ehs entity transmits only data having consecutive TSNs to an upper entity to ensure in-sequence delivery in the reordering queue. Since the data having non-consecutive TSNs are continuously stored in the reordering queue, a RESET PDU may not be transmitted to the parent entity.

In the reordering queue, if the size of the received MAC-ehs SDU is 32 bytes, the most significant 4 bits of the data are parsed. If the data stream is 0001, it is determined as a RESET PDU. Or a RESET ACK PDU when the data stream is 0010.

The PDU processing unit of the present invention controls the MAC-ehs entity, separates the MAC-ehs SDU from the reordering queue, and transmits the MAC-ehs SDU to the RLC layer via the MAC-d entity. 3, an LCH-ID (Logical CHanner ID) indicates an ID of a logical channel

4 is a diagram illustrating a RESET PDU or a RESET ACK PDU according to an embodiment of the present invention.

Referring to FIG. 4, the RESET PDU or RESET ACK PDU is padded to be 32 bits in size.

5 is a diagram illustrating a process of transmitting a RESET PDU or a RESET ACK PDU according to an embodiment of the present invention.

5, the RLC layer of the UE 510 transmits a RESET PDU or RESET ACK PDU transmitted through the MAC layer to the UTRAN 550 (steps a and b) ).

If the RESET PDU or RESET ACK PDU is stalled in the reordering process of the MAC layer of the UTRAN 550 (step c), the RESET PDU or RESET ACK PDU May be transmitted from the MAC layer of the UTRAN 550 to the RLC layer (step d).

The RLC layer of the UTRAN 550 may receive the RESET PDU and enter the "Pending State" (step e).

5, the RLC layer of the UTRAN 550 transmits a RESET PDU or RESET ACK PDU transmitted through the MAC layer to the SS 510 (steps f and g) .

If the RESET PDU or RESET ACK PDU is stalled in the reordering process of the MAC layer of the SS 510 (step h), the RESET PDU or RESET ACK PDU The MAC layer of the UE 510 can be transmitted to the RLC layer (step i).

6 is a flowchart illustrating an operation of a receiver according to an embodiment of the present invention.

Referring to FIG. 6, the MAC-ehs entity of the receiver analyzes the MAC-ehs header of the first MAC-ehs SDU included in the reordering PDU in the MAC-ehs PDU and loads the L field value (step 610 ). If the value of the L field is not 32 bits (step 615), the MAC-ehs entity stores the reordering PDU in the reordering queue mapped to the LCH-ID (step 645).

Thereafter, the MAC-ehs entity transmits to each first MAC-ehs SDU included in the remaining reordering PDUs (Step 650). If all the processes are not performed, the process is repeated until all the processes are performed (steps 610 to 645).

The MAC-ehs entity decodes the most significant 4 bits (MSB 4 bits) of the MAC-ehs SDU if the L field value is 32 bits (step 620).

The MAC-ehs entity stores the reordering PDU in the reordering queue mapped to the LCH-ID in step 625 if the decoded 4-bit value is not 0001 or 0010 (step 625). That is, since the MAC-ehs SDU is not a RESET PDU or a RESET ACK PDU, a normal process is performed.

In step 650, the MAC-ehs entity checks whether the first MAC-ehs SDU included in the reordering PDU has been processed (step 650). If all of the steps are not performed (Steps 610 to 645).

The MAC-ehs entity decodes the MAC-ehs SDU if the decoded 4-bit value is 0001 or 0010 (step 625) each RESET PDU, and RESET ACK PDU.

The MAC-ehs entity then separates the RLC control PDU from the reordering PDU (step 630). The RLC control PDU indicates a RESET PDU or a RESET ACK PDU.

Thereafter, the MAC-ehs entity provides the RLC control PDU to the MAC-d entity (step 635).

Thereafter, the MAC-d entity forwards the RLC control PDU to the RLC layer mapped to the LCH - ID (step 640).

The MAC-ehs entity stores the reordering PDU in the reordering queue mapped to the LCH-ID (step 645). In step 650, the MAC-ehs entity checks whether the first MAC-ehs SDU included in the reordering PDU has been processed in step 650. If all of the steps are not performed (Steps 610 to 645).

7 is a block diagram of a receiver according to an embodiment of the present invention.

7, the transceiver 740 converts the encoded and modulated signals into signals of a transmission band set in the wireless communication system and transmits the signals to the air, Down conversion. Then, the band down converted signal is input to the HARQ receiver 730.

When the HARQ receiver 730 receives a signal, it performs demodulation and decoding, and transmits a response signal to the transmitter through a response channel. That is, if the decoding of the received data is successful, the HARQ receiver 730 transmits an ACK signal through a response channel, and if the decoding fails, the HARQ receiver 730 transmits a NACK signal through a response channel.

If the received data is successfully decoded, the HARQ receiver 730 delivers the decoded MAC PDU to the MAC receiver 720.

The MAC receiver 720 separates the RLC PDU (s) from the MAC PDU using the header information of the MAC PDU, and transmits the RLC PDU (s) to the RLC receiver 710. The MAC receiver 720 includes the MAC entities described above.

The RLC receiver 710 generates and outputs upper layer data such as application data at the time of transmission.

The PDU processing unit 730 controls the MAC receiving unit 720 and the RLC receiving unit 710. In particular, the PDU processor 730 controls the MAC receiver 720 to process the RESET PDU and RESET ACK PDU.

In the above-described block configuration, the PDU processing unit 730 can perform the functions of the MAC receiving unit 720 and the RLC receiving unit 710. In the present invention, these are separately constructed and described in order to describe each function separately.

The PDU processing unit 730 may be configured to process both the functions of the MAC receiving unit 720 and the RLC receiving unit 710 in the actual implementation of the product. ). ≪ / RTI >

8 is a flowchart illustrating an operation of a transmitter according to an embodiment of the present invention.

Referring to FIG. 8, the RLC layer of the transmitter generates a RESET PDU according to an instruction from an upper layer (step 810). If the RESET PDU requires byte alignment (step 815), the RLC layer performs byte alignment (32-bit alignment) (step 820) and transfers the byte alignment to a lower MAC layer for transmission to a receiver (step 825) .

If the RESET PDU does not need byte alignment (step 815), the RLC layer transfers the RESET PDU to the lower MAC layer for transmission to the receiver (step 825).

Thereafter, the algorithm according to the present invention terminates.

9 is a block diagram of a transmitter according to an embodiment of the present invention.

Referring to FIG. 9, the RLC transmitter 910 reconfigures the upper layer data to an appropriate size for transmission. The reconfigured data in the RLC transmitter 910 is referred to as an RLC PDU, and an automatic retransmission request (ARQ) operation is performed when a retransmission request for an RLC PDU is requested from a receiver. In particular, according to the present invention, the RLC transmitter 910 performs byte alignment (32-bit alignment) when the RESET PDU requires byte alignment when generating a RESET PDU, 920). Here, the MAC transmitter 920 may be a MAC-ehs entity.

The RLC transmitter 910 receives information on the size of an RLC PDU to be transmitted in a next transmission period (TTI) from a lower layer. Then, the RLC transmitter 910 divides or concatenates the upper layer data according to the size of the received RLC PDU, inserts the RLC PDU header, and creates an RLC PDU. The RLC PDU header may include serial number information or the like

The MAC transmitter 920 multiplexes RLC PDUs received from the RLC transmitter 910 to generate a MAC PDU 215. Since the RLC PDUs generated by the RLC transmitter 910 can be multiplexed into one MAC PDU, the multiplexing information for the RLC PDUs is inserted in the header of the MAC PDU.

The MAC PDU generated by the MAC transmission unit 920 is processed according to the HARQ scheme in the HARQ transmission unit 930 and is provided to the transmission and reception unit 940 and transmitted to the receiver through the wireless channel. In general, processing according to the HARQ scheme can be a coding and modulation process.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram illustrating a MAC-ehs PDU format according to the present invention;

2 is a diagram illustrating a structure of MAC / MAC-ehs in the UTRAN side according to the present invention,

3 is a diagram illustrating a structure of MAC / MAC-ehs on the terminal side according to the present invention;

4 illustrates a RESET PDU or a RESET ACK PDU according to an embodiment of the present invention;

5 is a diagram illustrating a process of transmitting a RESET PDU or a RESET ACK PDU according to an embodiment of the present invention;

6 is a flowchart illustrating an operation of a receiver according to an embodiment of the present invention.

7 is a block diagram of a receiver according to an embodiment of the present invention.

8 is a flowchart illustrating an operation of a transmitter according to an embodiment of the present invention,

9 is a block diagram of a transmitter according to an embodiment of the present invention.

Claims (20)

A method for transmitting a control PDU in a receiver MAC layer of a mobile communication system, Receiving a packet, Transmitting a packet to a reordering queue when the packet is determined not to be related to parameter initialization of an upper layer as a result of a determination based on a packet length of the packet and a value of a partial bit of the packet; And forwarding the packet to the upper layer when the packet is related to parameter initialization of the upper layer. The method according to claim 1, And transmitting the packet to the upper layer except the reordering, When the packet includes a RESET PDU or a RESET ACK PDU, transmitting the packet to the upper layer except for the reordering, Wherein the higher layer is an RLC layer. The method according to claim 1, Checking a size of a first field included in a header of the packet; And checking a most significant bit of the packet by a second size if the size of the first field is equal to the first size. The method of claim 3, Further comprising determining that the packet is associated with parameter initialization of the upper layer if the most significant bit of the second size is a predefined value. delete delete A method for transmitting a control PDU in a transmitter RLC layer of a mobile communication system, Performing byte alignment on a packet related to parameter initialization of an upper layer to a first size, Transmitting the packet to a lower layer; And transmitting the packet, And to forward the packet to an upper layer of the receiver except for reordering at the receiver if the packet is associated with parameter initialization of the upper layer. delete delete 8. The method of claim 7, The process of byte-aligning a packet related to parameter initialization of an upper layer to a first size, If the packet includes a RESET PDU or a RESET ACK PDU, allocating a first size of a packet related to initialization of an upper layer parameter, Wherein the lower layer is a MAC layer. An apparatus of a MAC layer of a receiver for transmitting a control PDU in a mobile communication system, A receiver for receiving a packet transmitted by the transmitter; When the packet is determined to be based on a packet length of the packet and a value of some bits of the packet, the packet is transferred to the upper layer when the packet is related to parameter initialization of an upper layer, And a PDU processing unit for delivering the packet to the reordering queue when the packet is not related to the reordering queue. 12. The method of claim 11, And wherein forwarding the packet to the upper layer, except for the reordering, And forwarding the packet to the upper layer except for the reordering if the packet comprises a RESET PDU or a RESET ACK PDU, Wherein the upper layer is an RLC layer. 12. The method of claim 11, The PDU processing unit, Checks the size of the first field included in the header of the packet, and checks the most significant bit of the packet by a second size if the size of the first field is equal to the first size. 14. The method of claim 13, The PDU processing unit, And determines that the packet is associated with parameter initialization of the upper layer if the most significant bit of the second size is a predefined value. delete delete An apparatus in an RLC layer of a transmitter for transmitting a control PDU in a mobile communication system, And an RLC unit for byte-aligning a packet related to parameter initialization of an upper layer to a first size, delivering the packet to a lower layer, and transmitting the packet, To forward the packet to an upper layer of the receiver except for reordering at the receiver if the packet is associated with parameter initialization of the upper layer. delete delete 18. The method of claim 17, Byte sorting of the packets associated with parameter initialization of the upper layer to a first size, And if the packet includes a RESET PDU or a RESET ACK PDU, byte-aligning the packet associated with the initialization of an upper layer parameter to a first size, Wherein the lower layer is a MAC layer.

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