WO2009099305A2

WO2009099305A2 - Device and method for constituting a transmission packet in mobile communication system

Info

Publication number: WO2009099305A2
Application number: PCT/KR2009/000566
Authority: WO
Inventors: Soeng-Hun Kim; Gert Jan Van Lieshout
Original assignee: Samsung Electronics Co., Ltd.
Priority date: 2008-02-05
Filing date: 2009-02-05
Publication date: 2009-08-13
Also published as: WO2009099305A3

Abstract

This invention relates to a device and a method for constituting a transmission packet in a mobile communication system, particularly to a method for constituting a packet that includes at least one packet data unit (PDU) in a mobile communication system. The method comprises the steps of: determining a minimum segmentation parameter which determines the minimum size of an RLC SDU segment that is received at the last RLC PDU after being segmented, wherein the RLC PDUs are received at an MAC PDU sequentially according to priority; calculating the approximate value of an RLC PDU size that is acceptable to a remaining MAC payload of the MAC PDU; determining the size of the RLC PDU by comparing the size of the remaining MAC payload with the sum of the approximates values related to both the minimum segmentation parameter size and the RLC PDU size; creating and outputting the RLC PDU, which selectively includes the RLC SDU segment, according to the determined size.

Description

【Specification】

[Name blue of invention]

Apparatus and method for configuring a transmission pattern in a mobile communication system

The present invention relates to an apparatus and method for configuring a transmission pattern of a mobile terminal in a mobile communication system, and more particularly, to an apparatus and method for determining an I size with a radio link control (RLC) protocol data unit (PDU) of a mobile terminal. .

Background Art

UMTS system in mobile communication system is a UMTSOJni versa I Mobile Telecommunication Service (MST) system that enables communication from anywhere in the world through various systems such as cellular, wireless telephone, wireless subscriber network, wireless LAN and satellite communication. Rem. It is based on the European System of Global Communications for GSM (GSM) and is based on General Packet Radio Services (GPRS) and uses Broadband Code Division Multiple Access (hereinafter referred to as "CDMA"). A third generation mobile communication system using an asynchronous method.

H¾-switched connections using packet protocols such as Internet Protocol (hereinafter referred to as "IP") in UMTS support the concept of virtual connections, which always connect to any other end point in your network. This is possible. It also allows mobile phone and computer users to go anywhere in the world! It provides a consistent service that can transmit ¾-based text, digitized voice or video and multimedia data at high speeds above 2Mbps.

The 3rd Generation Partners i Project (3GPP), which is currently under the UMTS standard, is discussing the Long Term Evolution (LTE) as the next generation mobile communication system of the UMTS system. LTE is a technology that implements high-speed packet-based mobile communication with a transmission rate of up to 100 bps, aiming for commercialization in 2010. To this end, various measures are discussed. For example, a method of reducing the number of nodes located on a communication path by simplifying a network structure, or approaching wireless protocols as close as possible to a wireless channel are under discussion. Hereinafter, one part of the next generation mobile communication system structure will be described by creating FIG. 1.

Alternative Response (Article 26) Drawing.

Next-generation base stations (referred to as Evolved Node B: hereafter referred to as "ENB") (120, 122, 124, 126, 128) are evolved radio access networks (hereinafter referred to as "E-RAN"). And, it is simplified to a two-node structure of the upper node (Access Gateway) (130, 132) in charge of the Serving GPRS Support Node (SGSN) function and the Gateway GPRS Support Node (GGSN) function. . The user terminal (hereinafter referred to as "UE") 101 is connected to the Internet Protocol (hereinafter referred to as "IP") network by the E-RANs 110 and 112.

The ENBs 120 to 128 correspond to Node Bs of the UMTS system and are connected to the UE 101 by a radio channel. The ENBs 120 to 128 play a more complicated role than the Node B, and one ENB typically controls a plurality of cells. In LTE, all user traffic, including real-time services such as Voice II Internet Protocol (VoIP), is served over a shared channel. Accordingly, an apparatus for collecting and scheduling situation information of the UEs 101 is required, and the ENBs 20 to 128 are responsible for this. In addition, it performs ARQ (Automatic Repeat Request) for retransmitting an error frame performed by RNG of UMTS system and Radio Resource Control (hereinafter referred to as "RRC") to determine radio resources and handover. do.

The UE (101) and the ENB (120 to 128) is an orthogonal frequency division multiplexing in the 20 MHz bandwidth in order to implement the transfer rate of up to 100 Mbps (Orthogonal Frequency Division Multiplexing · ' below "OFDM" as invited) radio access Use it as a technique. In addition, a modulated ion scheme and an adaptive modulation < RTI ID = 0.0 > (AMC) < / RTI >

2 is a schematic diagram of a protocol stack of a general mobile terminal and a next-generation base station.

Both the mobile terminal and the next-generation base station have the same form, and include Packet Data Convergence Protocol (PDCP) 220 and 255, Radio Link Control (RLC) 225 and 250, edium access control (MAC) 230 and 245, and physical It is made up of layers 235 and 240. Then, in the following description of the operations performed in each protocol layer, when the UE 205 transmits data and the ENB 210 receives the data, the radio protocol layer processes the packet at the radio protocol layer. Explain.

The PDCP layer 255 is used only in the packet exchange area, and compresses the header of the IPEH kit on the packet data E to be transmitted by the UE 205 so as to increase the transmission efficiency of packet data in the wireless channel. It outputs the PDCP PDU (Packet Data Unit: hereinafter referred to as "PDU" of the protocol).

The RLC layer 225 divides data transmitted from a higher layer into RLC SDUs to form data of an appropriate size for a radio interval, concatenates the divided RLC SDUs, forms an RLG PDU *, and transmits a packet. If it fails, perform ARQ operation.

The MAC layer 230 is a layer responsible for mapping between logical channels and transport channels. The MAC layer 230 is connected to a plurality of RLC entities and multiplexes the output RLC PDUs to output them as MAG PDUs.

The physical layer 235 is a layer for providing an information transmission service using a wireless transmission technology. The physical layer 235 performs channel coding, modulation, and outputs the multiplexed MAC PDU on a wireless channel.

The g layer 240 of the ENB 210 outputs the channel data decoded and demodulated from the UE 205 to a higher layer. The channel decoded and demodulated data Θ is input to the MAC layer 245 in the form of a MAC PDU. The MAC layer 245 then demultiplexes and separates 9 MAC SDUs from MAC PDUs. That is, MAC SDUs become RLC PDUs. The RLC layer 250 interprets the information of the RLG PDU in order to recover the original RLC SDU from the RLC PDUs, separates the information into an RLC SDU, and outputs the information to the upper layer. The PDCP layer 255, which is an upper layer of the RLC layer 250, is responsible for the restoration of the IP header from the RLC SDUs.

The UE 205 and the ENB 210 have the same structure of the protocol stack, and the same high-definition inverse fixation described above is also performed. That is, even when the ENB 210 transmits data and the UE 205 receives the data, the process of processing a packet in the radio protocol layer is performed in the same manner. As mentioned above, in the next generation mobile communication system such as LTE, Vc) IP is one of the core services because all services are provided on a packet basis. Because VoIP traffic is continuously generated at small intervals with a small number of packets, high overhead can occur in a base station scheduler-based mobile communication system. For example, a VoIP service operating in 12.2 kbps AMR codec mode has a size of about 35 bytes. EH kits occur at 20 msec. In order to support each VoIP protocol by a general scheduling method, the overhead due to the control information may be larger than the actual user data because information for requesting scheduling and uplink resource allocation information are transmitted whenever a packet occurs. In order to alleviate this problem, LTE uses a persistent scheduling scheme. Hereinafter, a semi-persistent transmission ^' resource allocation scheme will be described with reference to FIG. 3.

3 is an exemplary view for explaining a general process of data transmission according to a semi-persistent transmission resource allocation scheme.

The ENB 310 indicates to the UE 305 a semi-permanent transmission resource that is periodically repeated and a semi-permanent transmission format to be applied to the semi-permanent transmission resource in step 315. In step 320 and 325, the UE 305 transmits data through the semi-persistent transmission resource without a separate control signal exchange, and a semi-persistent transmission format is applied to the data transmitted through the semi-persistent transmission resource. The transmission format refers to a modulation scheme, a packet size, a channel coding scheme, and a coding scheme. The semi-persistent transmission format refers to a transmission format that the terminal applies to the data in transmitting data through semi-persistent transmission resources. Since a packet exchanged through a wireless channel between the terminal and the base station is called a MAC PDU, the size of the EH kit in the transmission format means the size of the MAC PDU. For convenience of description, the size of the MAC PDU transmitted through the semi-persistent transmission resource is called a semi-persistent MAC PDU size. By using the semi-persistent transmission resource allocation scheme, the overhead can be greatly reduced because a control message simultaneously indicates a transmission resource and a transmission format to be used for transmitting a plurality of MAC PDUs. Hereinafter, the configuration of the semi-persistent MAC PDU size will be described with reference to FIG. 4.

4 is a diagram illustrating the size distribution of VoIP packets after header compression. In general, the size of the header compressed VoIP II packet has a distribution as shown in FIG. When the size of the smallest packet is referred to as X bytes, X byte packets occur most frequently, packets that are several bytes larger than X bytes occur at low frequency, and larger packets occur at extremely low frequency. In consideration of such traffic characteristics, it is effective to set the size of the semi-permanent MAC PDU to a size that can transmit a packet of several bytes larger than the smallest VoIP packet. If the semi-permanent MAC PDU size is set for the smallest VoIP packet, the packet should be split and transmitted when a packet that is several bytes larger than the smallest V () IP EH kit occurs. Split transmission avoids error occurrences and transmission delays It is desirable to avoid this because it increases.

By setting the semi-permanent MAC PDU size based on the size of several bytes larger than the smallest VoIP packet, the frequency of partitioning can be reduced. Of course, if the size of the semi-permanent MAC PDU is set to the size of the largest VoIP packet, split transmission can be completely prevented, but in most cases, excessively allocated transmission resources are used as padding, which wastes transmission resources. There is a problem.

However, if the size of the semi-permanent MAC PDU is set to transmit a packet larger than the smallest packet in order to prevent the split transmission as described above, the split transmission of VoIP packets may increase, unlike the original intention. have. For example, if several VoIP II packets are stored in the transmission packet of the terminal, and the packets are the two smallest packets, the MAC PDU to be transmitted through the semi-persistent transmission resource is the first VoIP HH of the transmission packet. There is extra space left over the kit. In general, since the terminal stores data among all available MAC PDUs, the terminal divides and stores the next VoIP packet in the remaining space of several bytes. As described above, since the packet having the smallest size occurs most frequently, the extra space is also frequently generated, and there is a problem that the split transmission is continuously generated.

5 is a diagram illustrating an operation of determining a semi-permanent MAC PDU size. The semi-permanent MAC PDU 501 size consists of adding the conventional RLC header 510 and MAC header 505 to the smallest RLC SDU 515 and adding the margin 520 of several bytes to it. . And the size of the RLC PDU 503 is composed of a value that is typically added to the RLC SDU 515 RLC header 510.

In general, the UE receives an uplink transmission resource from a base station, receives a size of a MAC PDU to be transmitted through the transmission resource, and then determines sizes of RLC PDUs to be multiplexed into the MAC PDU. When a plurality of logical channels are configured in the terminal, the terminal determines the size of the RLC PDU for each logical channel by using the priority of the logical channel and the amount of data stored in the logical channel. The logical channel refers to an apparatus for processing a PDCP layer or PDCP layer configured to process data of a specific service, and an apparatus for processing an RLC layer or an RLC layer. Each logical channel is provided with a transport buffer. . Upper layer packets, such as VoIP packets, are stored in the transport packet prior to transmission over the wireless channel. The priority of the logical channel is specified in a call setup process. 6 is a general diagram for determining the size of an RLC PDU for configuration of a MAC PUD It is a figure for demonstrating operation | movement.

If there are three different types of data to be transmitted from the terminal, for example, as shown in FIG. 6, the logical channel 1 605, the logical channel 2 610, and the logical channel 3 615 are configured. In this case, when the terminal generates the MAC PDU 610 having an arbitrary size, if the priority of the logical channels I is in the order of logical channel 1, logical channel 2, logical channel 3, the terminal transmits the MAC PDU. I stores the data stored in the transmission bay I '630 of the logical channel 1 605 having the highest priority in the load 655 as much as possible. That is, the RLC PDL 645 having the same size as in Equation 1 is configured in the logical channel 1 605 and stored in the MAC payload 655.

[Equation 1]

RLC PDU SIZE— m = 謹 [MAC pay load size, MAX RLC PDU SIZE— m] The RLC PDU SIZE_m refers to the RLC PDU size of the logical channel m, and the MAX RLC PDU SIZE_m indicates the transmission bandwidth of the logical channel m. The size of the RLC PDU containing all data in the payload. Equation (1) is the size of the RLC PDU in which the data stored in the transmission channel I 베 of the logical channel m is maximally stored in the MAC payload and the smaller of the MAC payload size is the size of the RLC PDU of the logical channel m. Means 띔.

If there is extra space left in the MAC payload 655 even though the RLC PDU 645 of the size is larger than the MAC payload 655, then logical lower priority of the logical channel 1 605 is obtained. The data stored in the transmission buffer 635 of the channel 2 is stored as much as possible. That is, the RLC PDU 650 having the same size as the following Equation 2 is configured in the logical channel 2 and then stored in the MAC payload part 655.

[Equation 2]

RLC PDU SIZE_n = MIN [Remaining MAC pay load size, MAX RLC PDU SI E_n] The Remaining MAC pay load size means the size of the remaining MAC payload remaining after receiving the RLC PDU of higher priority. The terminal repeats the male process until the size of the remaining MAC payload becomes zero. Equation (1) shows the size of the RLC PDU and the RLC of the logical channel m, where the data stored in the transmission channel of logical channel n is stored in the MAC payload remaining after storing the RLC PDU of the logical channel m. Size of MAC payload remaining after storing PDU The smaller size means that the RLC PDU size of the logical channel π is shorter.

As described in the above-described process, the UE configures the RLC PDU of the maximum size that can be transmitted in the corresponding logical channel from the logical channel having the highest priority, and thus remains in the payload of the MAC PDU. Here, the RLC PDU is a concatenation of the RLC header and the RLC payload. The maximum of any Lodge barrels channel RLC PDU size is the sum of the sizes when sunip de all the data stored in the Lodge barrels channel which RLC P I ^", RLC payload and RLC Hi旧. Thus, the of the time When configuring the maximum size of the RLC PDU that can be transmitted in the logical channel, Vc) IP packet can be continuously transmitted in the logical channel mapped to the VoIP.

FIG. 7 illustrates an example of a general operation of MAG PDU multiplexing in a mobile station when semi-persistent resource allocation.

Before describing FIG. 7, it is assumed that the size of the most frequently generated RLC SDU is 36 bytes, the RLC header is 1 byte, the MAC header is 1 byte, the □ binary is 2 bytes, and the size of the semi-permanent MAC PDU is 40 bytes. . In addition, the RLC SDU to be transmitted at the X th transmission time is determined by the X th RLC SDU 705, the RLC SDL x + 1 th RLC SDU 710 to be transmitted at the x + 1 th time, and the x + 2 th transmission time point. The RCL SDU to be transmitted is called the x + 2 th RLC SDU 715. These are all assumed to be stored in the transmission basket and no data is stored in the other logical channels.

In this case, since the size of the semi-permanent MAC PDU (720, 735) in the X-th transmission is 40 bytes, the terminal generates an RLC PDU of the maximum size that can be transmitted in 40 bytes, that is, 39 bytes RLC PDU. If only the x-th RLC SDU 705 is left in the RLC PDU, the size of the RLC PDLK740 becomes 37 bytes. Accordingly, the terminal divides and stores a part of the x + 1 th RLC SDU 710 in the RLC PDU 745. One RLC PDU0II When two RLCSDUs are stored, the RLC PDU header stores 2 bytes in °, and the first 1 byte of the x + 1 th RLC SDU 710 is stored in the margin 725 of the RLC PDU 720 where the x th is transmitted. Is sent. This split transmission is also performed in the next transmission of the MAC PDU 735. That is, the x + 1 th transmitted MAC PDU 735 is also divided into the remaining x + 1 th RLC SDU 710 and the x + 2 th RLC SDU to be transmitted next, so that the margin of the MAC PDU 735 is divided. 730 is received and then transmitted.

As described above, if the allocated semi-permanent resource has a azine, transmission delay occurs because RLC SDU is continuously transmitted in MAC PDU, and retransmission may be requested like real time service or similar real time service. If it is not possible, the received packet must be discarded, which causes a problem of degrading the quality of service.

[Detailed Description of the Invention]

[Technical problem]

Accordingly, the present invention provides a packet configuration apparatus and method capable of preventing unnecessary retransmission of a transport packet.

In addition, the present invention is to provide a packet configuration apparatus and method that can prevent the degradation of service quality.

The present invention also provides an apparatus and method for constructing a packet to efficiently determine the size of an RLC PDU to be stored in a MAC PDU.

In addition, the present invention is to provide an apparatus and method for preventing the re-transmission or degradation of the quality of the RLC PDU is divided into the RLC SDU in an excessively small size.

In addition, the present invention provides a packet configuration apparatus and method that can reduce the transmission delay and transmission error of the RLC SDU.

Technical Solution

In the method of constructing a packet including at least one packet data unit (PDU) in a mobile communication system according to the present invention, the RLC PDUs sequentially numbered in the MAC PDUs in order of priority. RLC that can be stored in the remaining MAG Payload of the fixed (the fixed; MAC PDL) that determines the minimum partitioning para C1IEI that determines the minimum size of the RLC SDU segment divided and received in the last part Calculating an approximation of the PDU size; Determining the size of the RLC PDU by comparing the sum of the minimum partitioning parameter and an approximation of the size of the RLC PDU with the size of the < RTI ID = 0.0 > MA < / RTI > And generating and outputting an RLC PDU that selectively includes the RLC SDU segment according to the determined size. "Includes tablets.

In addition, in the mobile communication system according to the present invention, an apparatus for constructing a packet including at least one packet data unit (PDU), the MAC PDU (Packet Data Unit) sequentially according to priority An RRC layer unit configured to determine an ultra I subdivision parameter for determining a minimum size of an RLC SDU segment that is divided and stored in a last portion of an RLC PDU to be stored in the RLC PDU; Remaining MAC Payload (Oll) of the MAC PDU may remain An RLC PDU size determination unit calculating an approximation value of an RLC PDU size and determining the size of the RLC PDU by comparing the sum of the minimum divided parameter £ | and the approximation value of the RLCPDU size with the size of the remaining MAC payload. ; And an RLC layer unit for generating and outputting an RLC PDU selectively including the RLC SDU segment according to the determined size of the RLC PDU.

On the other hand, at least one of ⁱ packet data unit in the present invention [C areun mobile communication system: RLC PDU is a method for configuring ¾¾ to Pohang the (Packet Data Unit PDU), housed in a sequential MAC PDU in order of priority Determining a minimum partitioning parameter for determining a minimum size of an RLC SDU segment that is divided and received at a last portion of the RLC SDU segment; Determining the size of the required RLC PDU for each logical channel according to a predetermined technique and calculating an approximate ¾ of the size of the RLC PDU within a range not exceeding the size of the required RLC PDU; Determining the size of the RLC PDU by comparing the sum of the minimum partitioning parameter and an approximation of the size of the RLC PDU with the size of the required RLC PDU; And generating and outputting an RLC PDU optionally including the RLG SOU segment according to the determined size.

In addition, in the apparatus for constructing a packet including at least one packet data unit (PDU) in a mobile communication system according to the present invention, a □ of an RLC PDU housed in a MAC PDU in order of priority An RRC layer unit for determining a minimum partitioning parameter for determining a minimum size of an RLC SDU segment that is divided and stored in a last portion; A MAC layer unit for determining the size of the required RLC PDU for each logical channel according to a predetermined criterion; An approximate ¾ of the size of the RLC PDU is calculated within a range not exceeding the size of the required RLC PDU, and the sum of the approximate value of the RLC PDU size is obtained by adding the approximate value of the RLC PDU size to the size of the required RLC PDU. An RLG PDU size determining unit for comparing the size of the RLC PDU; And an RLC layer unit that generates and outputs an RLC PDU that selectively includes the RLC SDU segment according to the determined size.

Advantageous Effects

According to the present invention, it is possible to solve various problems caused by continuous transmission of RLCSDUs by determining the size of the RLC PDU even if the RLC SDU: is divided into too small and not accommodated. Therefore, according to the present invention, there is an advantage of preventing degradation of quality of service or unnecessary retransmission and transmission delay in the far packet transmission system. [Brief Description of Drawings]

1 is a diagram illustrating an example of a general next generation mobile communication system structure;

FIG. 2 is a diagram illustrating a protocol stack structure of a general mobile terminal and a next-generation base station. FIG. 3 is an exemplary diagram illustrating a general process of transmitting data according to a semi-persistent transmission resource allocation scheme.

4 is a diagram illustrating a size distribution of VoIP packets subjected to header compression, FIG. 5 is a diagram illustrating determining a semi-permanent MAC PDU size, and FIG. 6 is a diagram illustrating a general size of an RLC PDU for configuring a MAC PUD. Drawing for explaining the operation ，

FIG. 7 is an exemplary view for explaining a general operation of MAC PDU multiplexing in mobile serial when semi-persistent resource allocation;

8 is an exemplary diagram for explaining an operation of determining the size of an RLC PDU when constructing a packet (MAC PDU) according to the present invention;

9 is a block diagram illustrating an internal block of a mobile terminal for configuration of an H packet according to an embodiment of the present invention;

10 is a control flow β diagram for determining the size of the RLC PDU to be left in the II packet according to the first embodiment of the present invention;

11 is a control flowchart for determining the size of an RLC PDU in accordance with a second embodiment of the present invention.

[Form for implementation of invention]

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, specific details appear in the following description, which is provided to help a more general understanding of the present invention, and it is obvious to those skilled in the art that the present invention may be practiced without these specific details. Will do. In the following description of the present invention, detailed descriptions of well-known functions and configurations will be omitted when it is determined that the detailed description of the configuration may unnecessarily obscure the subject matter of the present invention.

In addition, in the detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings, it should be noted that the same components in the drawings represent the same reference numerals anywhere possible. However, even if the same code is used, the operation is different depending on the embodiment. First, the operation made in the present invention will be schematically shown. Prior to the description, when the size of the RLC PDUs generated in the logical channels are determined in the order of high priority, and when the RLCPDU corresponding to the determined size is stored in the MACPDU, the number of remaining MAC PDUs may be loaded after several months Is assumed to be X bytes. In addition, when RLC SDUs stored in the transmission protocol of the logical channel to be stored in the load are sequentially received from a high transmission priority, the maximum size does not exceed the X byte i RLC. Assume that the size of the PDU is y bytes.

Referring to the above description, the UE may determine the size of the RLG PDU to be generated in any logical channel as follows. In the present invention, the UE determines the size of the RLG PDU as y if the value of subtracting y from X is less than or equal to a predetermined z value, and sets the size of the RLC PDU to X if the value of subtraction y from X is greater than or equal to a predetermined z. Decide This will be described in more detail with reference to the drawings described above.

8 is an exemplary view for explaining an operation of determining the size of an RLC PDU when configuring a CC-k-M kit (MAC PDU) according to the present invention.

The MAC payload 801 receives RLC PDUs 801 and 803 corresponding to each logical channel in the order of increasing priority of each logical channel. FIG. 8 illustrates a case where a residual area exists in the MAC payload after receiving RLC PDUs corresponding to two logical channels. As described above, it is assumed that the size of the remaining MAC payload, ie, the size of the remaining area, remaining after storing the RLC PDU generated in the logical channel of the higher priority is X bytes 805. When the RLC SDUs stored in the remaining logical channels are sequentially received from a high transmission priority, the RLC PDU is configured not to exceed X bytes while including the last byte of the RLC SDU. For example, if the transmission priority is RLC SDU [k + 1], RLC SDU [k + 2] RLC SDU [k + n], each RLC

The last byte of the SDU is included and the RCL PDU is constructed by storing it sequentially so as not to exceed X bytes. The maximum size of the RLC PDU configured as described above is referred to as y bytes 810.

When the MAC PDU is configured as described above, the UE determines the size of the RLC PDU as y when the value of subtracting y from X is less than or equal to a predetermined predetermined z. On the other hand, if the value of subtracting y from X is greater than or equal to a predetermined predetermined z, the size of the RLC PDU is determined as X.

Where z is a parameter for controlling the minimum size of the RLG SDU segment dividedly received at the end of the RLC PDU, and z is for each logical channel. As a para DIEI for controlling the minimum size of a segment, z may be indicated by call setup fixing for each logical channel or may be stored in advance according to each service type. Alternatively, it may be provided periodically or through a specific channel. Alternatively, z may be indirectly inferred using parameters provided in other communications. For example, when the z value is not signaled, the size of the unit framing header may be used as the z value in the logical channel.

In the following description, z will be referred to as the "minimum splitting parameter ΕΓ of the RLC SOU segment and commonly used with z. The minimum size of the RLC SDU segment that can be partly stored at the end of the RLC PDU is [zf]. Is the size of a unit framing header consisting of an extension bit, a length indicator, and II coding, and the unit framing header is typically added as a header added to the RLC PDU whenever the last byte of the RLC SDU is left. 2 bytes The length indicator indicates the position of the last byte of the associated RLC SDU, i.e., f is a size limit value of the last RLC SDU, which is used in combination with f as a "size limit value" for convenience of description below. Shall be.

If the z value is used as the unit framing header as described above, the minimum size of the RLC SDU segment is [z-f], so the minimum size of the RLCSDU segment is zero. This means that if z is greater than f, the segments of the RLC SDU are always stored. For example, if the z value is 2 bytes and the RLC P0U size approximation is 100 bytes, then the RLC SDU segment can be left only if the size of the remaining MAC payload is 102 bytes or more, and if the size of the remaining MAC payload is 101 bytes, then RLC Do not store SDU segments.

9 is an internal block diagram of a mobile terminal for the configuration of a pattern according to an embodiment of the present invention.

The RRC layer unit 905 determines z, which is the minimum partitioning parameter of the RLC SDU, and provides it to the RLC PDU size determination unit 910. The RLC PDU size determination unit 910 is previously provided with a MAC PDU size from the MAC layer unit 920. Accordingly, the RLC PDU size determination unit 910 uses the information provided from the RRC layer unit 905, that is, the priority channel I for each logical channel, the size of the RLC SDUs stored in the logical channel, and the I RLC for each logical channel using the z. Determine the PDU size. In addition, the RLC PDU size determination unit 910 is the MAC. An RLC PDU size approximation value and the RRC determined as the size of the remaining MAC payload remaining after receiving RLC PDUs sequentially from a higher priority using the PDU size information, the size of the RLC PDU closest to the size of the remaining MAC payload. Notified from hierarchy 905 The z value is used to determine the size of the RLC PDUs. This determination operation will be described in more detail in the control flowchart described later.

The RLC PDU sizes determined through this process are informed to a plurality of RLC entities provided in the RLC layer unit 915. The RLC layer unit 915 is a set of RLC elements that are responsible for reliable transmission and reception of higher layer data or RRC messages, and the RLC element stores RLC SDU black or RLC SDU segments, which are higher layer data. Each RLC element configures an RLC PDU according to the determined RLC PDU size and transmits it to the MAC layer unit 920. The MAC layer unit 920 that receives the RLC PDU concatenates the RLC PDUs delivered by the RLC elements to form a MAC PDU, and then delivers the MAC PDU to the physical layer unit 925. The physical layer unit 925 transmits and receives a MAC PDU received from the RLC layer unit 915. That is, encoding and modulation operations, band up conversion and power control operations for transmission over a wireless channel are performed. This process is generally performed in a wireless communication system, which will not be described in detail herein.

10 is a control flow diagram for determining the size of an RLC PDU to be left in a packet according to the first embodiment of the present invention.

The terminal recognizes a z value to be applied for each logical channel in step 1005. As described above, the z value may be signaled directly in a call establishment process or the like, may be inferred from another para 0 |, or may be periodically or aperiodically informed through a specific channel. In the logical channel where the z value is not signaled, the size of the unit framing header may be used as the z value.

In step 1010, the UE calculates an approximation of the size of the RLC PDU. The approximate value of the size of the RLC PDU is the size of the RLC PDU in which the maximum RLC SDU is infiltrated within the range where the remaining MAC ffll does not exceed the load range. Referring to FIG. 8, the approximation of the size of the RLC PDU inserts up to the last RLC SDU, but does not exceed the range of the remaining MAC | load (reference number 805 in FIG. 8). Means the RLCPDU size (reference numeral 810 of FIG. 8) injected. In other words, the RLC PDU size approximation value is that when the RLC SDUs stored in the transmission channel of the corresponding logical channel are sequentially stored in the RLC PDU even though the last byte is included according to the transmission priority, the size of the RLC PDUs is determined from the higher priority. The size of the RLC PDU closest to the size of the remaining MAC payload remaining after receiving the RLC PDU.

A high-resolution example for calculating an approximation of the RLC PDU size is described below. For example, the remaining MAC ᅵ the size of this load is 1000 bytes The size of the RLC SDUs stored in the transmission channel of logistic channel a is RLC SDU [n] = 200 bytes, RLC SDU [π + 1] = 500 bytes, RLC SDU [n + 2] = 290 bytes, RLC SDU [n + 3] = 300 bytes. In addition, when the transmission priority of the RLC SDUs is inversely proportional to a serial number (π, π + 1, η + 2, π + 3), the RLC SDU [n], RLC SDU [n + 1], and RLC SDU in the RLCPDU. When the last byte of [n + 2] is left to be included, the size of the RLC PDU does not exceed 1000 bytes, which is the size of the remaining MAC payload. Therefore, the approximate value of the RLC PDU size is 995 bytes obtained by adding 1 byte of the basic header size of the RLC PDU and 4 bytes of two unit framing unit headers to 990 bytes. In this case, the number of received RLC SDUs is two, but the number of additional unit framing headers is not three, because if the last byte of the RLC SDU matches the last byte of the RLC PDU, the unit framing header of the RLC SOU is RLC. This is because it is not added to the PDU.

After determining the approximate value of the RLC PDU size, the process proceeds to step 1015 to compare the sum of the approximation value of the RLC PDU size and the z and the size of the residual MAC payload. The comparison result ᅡ, if the size of the residual MAC payload is greater than or equal to the sum of the approximate value of the RLC PDU size and the z, proceeds to step 1020, and if not, proceeds to step 1025.

In step 1015, if the size of the residual MAC payload is an approximation of the size of the RLC PDU and is greater than or equal to the sum of the z, that is, the approximation of the size of the RLC PDU and the sum of the z is the residual MAC payload. If I is smaller than or equal to the size of the load, it means that the size of the RLC SDU segment to be divided and left is greater than [zf | when the number of RLC SDUs is divided into the last part of the RLC PDU. The size of is determined as the remaining MAC payload size. In this case, the RLCSDU segment may be divided and stored at the end of the RLCPDU.

On the other hand, if the size of the residual MAC payload is smaller than the sum of the approximation of the RLC PDU size and the z in step 1015, that is, the approximation value of the RLC PDU size and the sum of the z are the remaining MAC payload size. Larger means that when the RLC SDU is dividedly stored in the last portion of the RLC PDU, the size of the RLC SDU segment to be received is small, so that the divided transmission of the RLC SDU is meaningless or ineffective. The UE determines the size of the RLC PDU as an approximation of the RLC PDU size calculated in step 1010.

After the high fixation, an RLC PDU having the determined size is generated in step 1030, and the size of the I residual MAC payload at the corresponding point in time 1035 is determined. The remaining MAC payload size is updated by subtracting the size of the determined RLC PDU and the size of the MAC subheader.

11 is a control flowchart for determining the size of an RLC PDU according to the second embodiment of the present invention. The second embodiment also uses the I approximation of the RLC PDU size as in the first embodiment, but uses an approximation of the RLC PDU size determined in a different manner from the first embodiment.

In step 1105, the UE recognizes a z value to be applied for each logical channel. In step 1110, the MAC layer unit 920 determines the size of the RLC PDU for each logical channel (hereinafter, referred to as a “required RLC PDU”) by using the logical channel priority and the amount of stored data. Notify). The RLC layer unit 915 receiving the requested RLC PDU size uses an size and priority of upper layer data to be transmitted in step 1115, and approximates an RLC PDU size within a range not exceeding the required RLC PDU size (approximate). RLC PDU size) is calculated. For example, the size of the requested RLC PDU is 1000 bytes, and the size of the upper layer 2 packet stored in the logical channel is RLC SDU [n] = 200 bytes, RLC SDU [n + 1] = 500 bytes, and RLC SDU. If [n + 2] = 250 bytes, RLC SDU [n + 3] = 300 bytes, configure the RLC PDU to include the last byte of all higher layer packets from RLC SDU [n] to RLC SOU [n + 3] Then, the size of the RLC PDU is the sum of the payload 1290 bytes and the RLC header size, so that the size of the requested RLC PDU is 1000 bytes and cannot be approximated to the RLC PDU size. Also, if you configure an RLC PDU, which contains the last byte of the upper layer packet from RLC SOU [π] to RLC SOU [π + 2], the size of the RLC PDU is the payload 950 bytes plus the RLC hyssop bytes. In other words, the value may be an RLC PDU size approximation.

After determining the approximate value of the RLC PDU as described above, the RLC layer unit 915 compares the calculated RLC PDU size approximation with the ζ and compares the requested RLCPDU size in step 1120. In step 1120, if the size of the RLCPDU is larger than the sum of the approximation of the z value and the RLC PDU size, that is, the sum of the value of the z value and the approximation of the RLCPDU size is smaller than the required size of the RLCPDU, the process proceeds to step 1125. . This means that when an RLC PDU having a size of a required RLC PDU is generated, an RLC SDU segment having a size larger than [zf |] is divided and stored in the last portion of the RLC PDU, and the UE determines the size of the required RLC PDU with an RLC PDL I size. Decide on

On the other hand, if the required RLCPDU size is less than or equal to the sum of the z-values and the approximation of the RLCPDU sizes in step 1120, that is, the summed values If the size is greater than or equal to the required RLC PDU size, the process proceeds to step 1130. When the RLC PDU having the required RLC P0U size is generated, the RLC SDU segment having a size smaller than [zf] is divided and stored in the last portion of the RLC PDU. In order to prevent the segment from ineffectively remaining, the RLC P0U size approximation calculated in step 1115 is determined as the RLC PDU size.

In step 1135, the RLC layer unit 1020 generates an RLC PDU based on the size of the determined RLC PDU and delivers it to the lower layer. Generated above _. If the size of the QLC PDU is smaller than the size of the required RLC PDU, that is, if the size of the RLC PDU is an approximation of the size of the RLC PDU rather than the size of the required RLC PDU, the MAC device of the UE determines the required RLC PDU size and the actual RLC PDU size. The difference between the two can be corrected by padding.

As described above, the present invention uses the logical channel I priority, the size of the stored RLC SDU, and the predetermined parameter to determine the size of the RLC PDU so that the RLC SOU is not divided and stored in an excessively small size. It is possible to prevent continuous transmission.

Claims

[Patent Claims]

[Claim 1]

1. A method of constructing a packet including at least one packet data unit (PDU) in a mobile communication system,

Minimum partitioning parameter that determines the minimum size of the RLC SDLKService Data Unit (RLC) segment divided into the last part of the RLC (Radio Link Control) PDU, which is sequentially stored in the MAC tedium Access Control (PDU) PDU according to the priority. ᅡ deciding which I-terminator;

Calculating an approximation of an RLCPDU size that may remain in the remaining MAC payload of the MACPDU;

Determining the size of the RLC PDU by comparing the sum of the minimum partitioning parameter and an approximation of the size of the RLC PDU with the size of the remaining MAC payload; And

And generating and outputting an RLC PDU¾ which selectively includes the RLC SOU segment according to the determined size.

[Claim 2]

The method of claim 1, wherein the minimum partitioning parameter is

It is one of the values that are preset according to each service type, the value that is periodically provided through a specific channel, and the value that can be estimated using the parameters provided in other communication provided as needed through a specific channel. Characterized by the IIH kit configuration method.

[Claim 3]

The method of claim 1, wherein an approximation of the size of the RLC PDU is

A method of constructing a packet, characterized in that the size of the RLCPDU when the at least one RLCSDU is stored at a maximum within a range not exceeding the size of the remaining MAC payload, wherein the RLCPDU includes at least one RLCSDU. .

[Claim 4]

The method of claim 1,

High resolution for determining the size of the RLC PDU,

The size of the residual MAC payload is equal to the minimum partitioning parameter and the And determining the size of the RLC PDU as the size of the remaining MAC payload when the approximate value of the RLC POU size is equal to or larger than the sum of the approximated values.

[Claim 5]

The method of claim 1,

The process of determining the size of the RLC PDU,

Determining the size of the RLC PDU as an approximation of the size of the RLC PDU when the size of the residual MAC payload is smaller than the sum of the approximation of the minimum splitting parameter and the size of the RLC PDU. How to configure the kit.

[Claim 6]

The method of claim 1,

After generating the RLC PDU having the determined size, the fixed MAC payload size is updated by subtracting the size of the generated RLC PDU and the size of the MAC subheader from the size of the residual MAC payload. M kit configuration method characterized in that it further comprises.

[Claim 71

The method of claim 1,

The minimum size of the RLC SDU segment is determined as a value obtained by subtracting the size of the unit framing header from the value of the minimum partitioning parameter C1IEI ffl,

And the unit framing header is a header added when the last byte of the RLCSDU is stored in the RLCPDU.

[Claim 8]

An apparatus for constructing a packet including at least one packet data unit (PDU) in a mobile communication system,

A minimum that determines the minimum size of an RLC Service Data Unit (SDU) segment that is divided and stored at the end of a Radio Link Control (RLC) PDU to be stored in a MAC (Medium Access Control) PDU in order of priority. An RRC layer unit for determining a partition parameter;

Compute an approximation of the RLCPDU size that may remain in the remaining MAC load of the MACPDU, and calculate the minimum partitioning parameter and the RLC PDU size. An RLC PDU size determining unit configured to determine the size of the RLC PDU by comparing an approximation value with a size of the residual MAC HI load; And

And an RLC layer unit for generating and outputting an RLC PDU selectively including the RLCSDU segment according to the determined size of the RLGPDU. .

[Claim 9]

The method of claim 8, wherein the minimum partitioning parameter is

It is one of preset values according to each service type, values periodically provided through a specific channel, values provided as needed through a specific channel, and values that can be estimated using parameters provided in other communication. II ᅢ kit configuration device, characterized in that.

[Claim 10]

The method of claim 8, wherein an approximation of the size of the RLC PDU is:

A packet configuration characterized in that the size of the RLCPDU when the at least one RLCSDU is stored to the maximum within the range of not exceeding the size of the remaining MAC payload, the RLCPDU comprises at least one RLCSDU Device.

[Claim 11]

The method of claim 8,

The RLC PDU size determiner,

If the size of the residual MAC payload is greater than or equal to the sum of the approximate value of the minimum partitioning parameter and the RLC PDU size, the size of the RLC PDU is determined by the remaining MAC J¾l load I size Far I Kit Configuration Device.

[Claim 12]

The method of claim 8,

The RLC PDU size determiner,

If the size of the remaining MAC payload is less than the value acquired by adding the approximate value of the minimum division parameters and the RLC PDU size, L ¾ ^{'configuration,} characterized in that to determine the size of the RLC PDU to the approximate value of the RLC PDU size Device.

[Claim 13]

The method of claim 8,

The RLC PDU size determination unit,

After generating the RLC PDU having the determined size, the residual MAG payload size is updated by subtracting the size of the generated RLC PDU and the size of the MAC subheader from the size of the remaining MAC PDU. Packet organization.

[Claim 14]

The method of claim 8,

The RLC PDU size determiner,

The minimum size of the RLC SOU segment is further determined by subtracting the size of the unit framing header from the value of the minimum splitting parameter.

And the unit framing header is a header added when the last byte of the RLC SDU is stored in the RLC PDU.

[Claim 15]

A method of constructing an E packet including at least one packet data unit (PDU) in a mobile communication system,

Determines the minimum size of the RLC Service Data Unit (SDU) Segment (SDU) segmented into the last part of the RLC (Radio Link Control) PDU, which is sequentially stored in the MAC tedium Access Control (PDU) PDU in order of priority. High resolution to determine minimum splitting parameter ¾;

Determining the size of the required RLC PDU for each logical channel according to a predetermined criterion, and calculating an approximation of the size of the RLC PDU within a range not exceeding the size of the required RLC PDU;

Determining the size of the RLC PDU by comparing the sum of the minimum partitioning parameter and an approximation value of the RLC PDU size with the size of the required RLC PDU; And

And generating and β outputting an RLC PDUS selectively including the RLC SDU segment according to the determined size.

[Claim 16]

The method of claim 15, High resolution for determining the size of the RLC PDU,

Determining the size of the RLC PDU as the size of the required RLC PDU when the size of the required RLC PDU is greater than or equal to a sum of an approximation of the minimum splitting parameter and the size of the RLC PDU. How to construct a packet.

[Claim 17]

The method of claim 15,

The process of determining the size of the RLC PDU,

Determining the size of the RLC PDU as an approximation of the size of the RLC PDU when the size of the required RLC PDU is smaller than the sum of the minimum partitioning parameter and the I approximation of the size of the RLC PDU. How to construct a packet.

[Claim 18]

An apparatus for configuring a packet including at least one packet data unit (PDU) in a mobile communication system,

Minimum division that determines the minimum size of the RLC Service Data Unit (SDU) segment that is split into the last part of the Radio Link Control (RLC) PDU, which remains in the Medium Access Control (MAC) PDU in order of priority. An RRC layer unit for determining a parameter;

A MAC layer unit for determining the size of the required RLC PDU for each logical channel according to a predetermined criterion;

An approximation value of the RLC PDU size is calculated within a range not exceeding the size of the required RLC PDU, and the sum of the approximation value of the minimum partitioning parameter and the RLC PDU size is compared with the size of the required RLC PDU to compare the RLC PDU. An RLC PDU size determiner for determining the size of the RLC PDU; And

And an RLC layer unit configured to generate and output an RLC PDU including the RLC SDU segment selectively according to the determined size.

(Claim 19)

According to that I 18,

The RLC PDU size determination unit,

The size of the required RLC PDU is equal to the minimum partitioning parameter and the RLC PDU. And determining the size of the RLC PDU as the size of the required RLC PDU when the approximate value of the size is equal to or larger than the sum of the approximated values.

[Claim 20]

The method of claim 18,

The RLG PDU size determiner,

And determining the size of the RLC PDU as an approximation of the size of the RLC PDU when the size of the required RLC PDU is smaller than a sum of the approximation of the minimum splitting parameter and the size of the RLC PDU. Configuration device. ^■