KR20100082698A - Method and apparatus of transmitting data efficiently using multiplexing mac header - Google Patents

Abstract

PURPOSE: By using one privacy information against a plurality of MAC SDU wholes by using the multiplex MAC header data communications method and apparatus thereof can reduce the waste of the resources due to data gratuitously overlapped with. CONSTITUTION: The MAC PDU including the multiplex MAC header about one transmitting end becomes. The MAC PDU which becomes is transmitted in the reception end. The MAC PDU comprises the general MAC header(GMH) about one privacy information about a plurality of MAC SDU wholes and plurality of MAC SDUs. The privacy information comprises the packet number field and integrity check value field.

Description

Efficient data transmission method and apparatus using multiplexed MAC header {Method and Apparatus of transmitting data efficiently using Multiplexing MAC header}

The present invention relates to a mobile communication system, and to a method and apparatus for transmitting data using a MAC header.

A communication system based on the Internet generally consists of a protocol stack consisting of five layers, and the configuration of each protocol layer is shown in FIG. 1.

1 is a diagram illustrating an example of a commonly used Internet protocol stack.

Referring to FIG. 1, the top layer of the protocol stack is an application layer, which is a layer for supporting network applications such as FTP / HTTP / SMTP / RTP. Next, there are a transport layer that performs data transmission function between hosts using a TCP / UDP protocol and a network layer that performs data transmission path setting from a source to a destination through an IP protocol. In addition, the protocol stack performs bit-by-bit transmission of data using a link layer that is responsible for data transmission and medium access control (MAC) and medium access control (MAC) between peripheral network entities through a PPP / Ethernet protocol. It is composed of the lowest physical layer.

2 is a diagram illustrating the operation of each layer for data transmission generally used.

Referring to FIG. 2, the transmission layer on the transmitting side adds header information to a message payload received from an application layer which is a higher layer to generate a new data unit. The transport layer sends it back to the lower network layer. In the network layer, a new data unit is generated by adding header information used in the network layer to data received from the transport layer, and then transmitted to the link layer, which is a lower layer. The link layer adds header information used in the link layer to data received from the upper layer to generate a new data unit, and transmits it to the lower layer physical layer. The physical layer transmits the data unit received from the link layer to the receiving side.

The physical layer on the receiving side receives the data unit from the transmitting side and transmits the data unit to its link layer, which is its upper layer. The receiving side processes the header added for each layer and transmits the message payload from which the header is removed to the upper layer. Through this process, data transmission and reception are performed between the transmitting side and the receiving side.

As shown in FIG. 2, a protocol header is added at each layer to transmit and receive data between a transmitting side and a receiving side to perform control functions such as data addressing, routing, forwarding, and data retransmission.

3 illustrates a protocol layer model defined in a wireless mobile communication system based on an IEEE 802.16 system.

Referring to FIG. 3, the MAC layer belonging to the link layer may consist of three sublayers. First, the Service-Specific Convergence Sublayer (Service-Specific CS) transmits data from the external network received through the CS SAP (Service Access Point) to the MAC SDU (CPS) of the Common Part Sublayer (CPS). Can be transformed or mapped into Service Data Units. This layer may include a function of classifying SDUs of an external network and then associating a corresponding MAC Service Flow IDentifier (SFID) with a Connection IDentifier (CID).

Next, MAC CPS is a layer that provides the core functions of MAC such as system access, bandwidth allocation, connection establishment and management, and receives data classified by specific MAC connection from various CSs through MAC SAP. . In this case, quality of service (QoS) may be applied to data transmission and scheduling through the physical layer.

In addition, the security sublayer may provide authentication, security key exchange, and encryption functions.

The MAC layer is a connection-oriented service and is implemented in the concept of transport connection. When a terminal is registered in the system, a service flow may be defined by negotiation between the terminal and the system. If the service request changes, a new connection can be established. Here, the transport connection defines the mapping between peer convergence processes using the MAC and service flow, and the service flow defines the QoS parameters of the MAC PDUs exchanged in that connection.

Service flow on the transport connection plays a key role in the operation of the MAC protocol, and provides a mechanism for QoS management of uplink and downlink. In particular, service flows may be combined with a bandwidth allocation process.

In a typical IEEE 802.16 system, a terminal may have a universal MAC address of 48 bits in length per air interface. This address uniquely defines the air interface of the terminal and may be used to establish the terminal's connection during the initial ranging process. Since the base station verifies the terminals with different identifiers (IDs) of the terminals, the universal MAC address may also be used as part of the authentication process.

Each connection may be identified by a connection identifier (CID) of 16 bits in length. During the initialization of the terminal, two pairs of management connections (uplink and downlink) are established between the terminal and the base station, and three pairs may be selectively used including the management connection.

4 illustrates a process of generating MAC PDUs for a plurality of MAC SDUs in a typical wireless wireless access system.

Referring to FIG. 4, it is assumed that MAC SDUs are transmitted for several, for example, three different flow connections for one UE. In this case, in order to generate a medium access control packet data unit (MAC PDU), the base station or the terminal may use a different generic MAC header (GMH) for each connection.

If there are MAC SDUs for three different connections, three MAC PDUs may be configured if GMH is attached to MAC SDUs, respectively. If a connection is activated with a security association (SA), each MAC PDU may include security information about the corresponding MAC PDU. In this case, the security information for the MAC PDU may be composed of a pair of packet number (PN) and integrity check value (ICV: Integrity Check Value).

 When there are MAC SDUs for a plurality of different connections, a plurality of MAC PDUs generated from each MAC SDU have PN and ICV values, respectively. In this case, regardless of the MAC SDU value, PN and ICV values of a certain size are included in the MAC PDU as many as the number of SDUs. Therefore, even when MAC SDUs having a relatively small size are used, resource waste may occur because PN and ICV are added to each MAC SDU.

The present invention has been made to solve the problems of the general technology as described above, an object of the present invention is an efficient data transmission method that can prevent the waste of resources due to unnecessary overlapping data, such as security information in a wireless communication system It is to provide.

Another object of the present invention is to provide a method for efficiently transmitting data by extending the capacity of a multiplexed MAC header as needed.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to solve the above technical problem, the present invention discloses an efficient data transmission method and transmission apparatus in a wireless communication system.

According to an aspect of the present invention, a method for efficiently transmitting a medium access control protocol data unit (MAC PDU) at a transmitting end may include a plurality of different flow connections for one transmitting end. A corresponding medium access control service data unit (MAC SDU) and a multiplexing MAC header indicating that the plurality of MAC SDUs are multiplexed into one MAC PDU Generating a MAC PDU and transmitting the generated MAC PDU to the receiving end.

In this case, the MAC PDU further includes at least one of one security information for the entirety of the plurality of MAC SDUs and a generic MAC header for each of the plurality of MAC SDUs, wherein the security information includes a packet number ( PN) field and integrity check value (ICV) field.

In addition, the multiplexed MAC header includes a flow ID field and a number of flow ID (NOF) field indicating the number of MAC SDUs for the one transmitter, wherein the flow identifier field is a specific bit. If set, this may indicate that the header is a multiplexed MAC header.

The multiplexed MAC header may further include an extended number of flow ID (extended NOF) field of a predetermined size when the flow identifier number field is set to a specific bit.

In addition, the multiplexed MAC header may further include an extended header (EH) field indicating whether an extended header exists.

Further, the multiplexed MAC header further includes a flow identifier number extension (NE) field, and when the flow identifier number extension field is set to a predetermined value, the number of flow IDs of a predetermined size (NOF LSB: Number Of Flow) An ID Least Significant Bit) field may be further included, and the lower flow identifier flow number field may indicate the number of flow identifiers together with the flow identifier number field.

In addition, the multiplexed MAC header may be located in front of the MAC PDU.

In addition, when the extended header (EH) field is set, the MAC PDU further includes an extension header including a type field indicating that the header is an extension header of the multiplexed MAC header, and includes a generic MAC header for each of the plurality of MAC SDUs. MAC header) may be located after the extension header.

In addition, the extension header may further include a last field indicating the presence of another extension header.

In addition, the plurality of MAC SDUs and the general MAC header for each of the plurality of MAC SDUs may be located between the packet number (PN) and the integrity check value (ICV) in the MAC PDU.

In addition, the general MAC header for each of the plurality of MAC SDU may be alternately located in a pair in the order corresponding to each other in the MAC PDU.

In another aspect of the present invention, a transmitting apparatus for generating a medium access control protocol data unit (MAC PDU) in a wireless access system may include a different flow connection for one transmitting end. A Multiplexing MAC Header indicating that the plurality of MAC SDUs are multiplexed in one MAC PDU is attached to a corresponding Medium Access Control Service Data Unit (MAC SDU). It may include a MAC PDU generation unit for generating a MAC PDU.

In this case, the MAC PDU generation unit further attaches one security information for the plurality of MAC SDUs and a generic MAC header for each of the plurality of MAC SDUs, wherein the security information is a packet number (PN) field. And an Integrity check value (ICV) field.

The MAC PDU generation unit may include a flow ID field indicating that the multiplexed MAC header is a multiplexed MAC header and a number of flow ID (NOF) field indicating the number of MAC SDUs for the one transmitter. MAC PDUs can be generated to be included.

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

First, by using the multiplexed MAC header in the embodiments of the present invention, it is possible to reduce the waste of resources due to unnecessary overlapping data by using one security information for all of the plurality of MAC SDUs.

Second, through the embodiments of the present invention, the capacity of the multiplexed MAC header can be expanded as needed to efficiently transmit data.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

The present invention relates to an efficient data transmission method and transmission apparatus in a wireless communication system.

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

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

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

That is, various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. In this case, the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), and an access point. In addition, the term 'mobile station' may be replaced with terms such as a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, or a terminal. .

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

Meanwhile, the terminal of the present invention includes a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, a MBS (Mobile Broadband System) phone, and the like. Can be used. In addition, the terminal may be a personal digital assistant (PDA), a hand-held PC, a notebook PC, a smart phone, a multi-mode multi-band (MM-MB) terminal. And so on.

 Here, a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal. have. In addition, a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (eg, Code Division Multiple Access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.

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

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

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

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802 system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document. In particular, embodiments of the present invention may be supported by one or more of the standard documents P802.16-2004, P802.16e-2005, and P802.16Rev2 documents of the IEEE 802.16 system.

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

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

FIG. 5 is a diagram illustrating a connection and a service flow (SF) used in an IEEE 802.16 system.

As shown in FIG. 5, the logical connection of the MAC layer maps the SF to a logical connection in which QoS parameters are defined in order to provide QoS for higher service flow (SF). In addition, logical connections are defined to provide QoS at the MAC layer through appropriate scheduling for data transmission for the connection. Types of the connection defined in the MAC layer include a management connection allocated to each terminal for management of the terminal in the MAC layer and a transport connection mapped to a service flow for higher service data transmission.

FIG. 6 is a diagram illustrating an example of a MAC PDU (MAC Protocol Data Unit) form defined in a wireless MAN mobile communication system based on the IEEE 802.16 system.

In general, the link layer (ie, link layer or MAC layer) and physical layer (Physical layer) below the second layer are protocols according to respective systems such as LAN, Wireless LAN, 3GPP / 3GPP2 or Wireless MAN, and headers of MAC PDUs accordingly. The format is defined differently. The MAC header includes a node MAC address or link address for data transfer between nodes in the link layer, and may include header error check and link layer control information.

Referring to Figure 6, each MAC PDU begins with a MAC header of a certain length. The header is located before the payload of the MAC PDU. The payload of a MAC PDU consists of a subheader, a MAC SDU, and a fragment. The length of payload information may be changed to represent a variable byte quantity. Accordingly, the MAC sublayer may transmit various traffic types of the upper layer without recognizing the format or bit pattern of the message. All reserved fields are set to '0' on transmission and ignored on reception.

The MAC PDU may include a cyclic redundancy check (CRC) for error detection. CRC function may be implemented in the physical layer of the OFDMA system. All fields reserved in the MAC PDU are designated as '0' and are ignored on receipt.

7 illustrates an example of a MAC header type used in a wireless MAN mobile communication system based on the IEEE 802.16 system. Hereinafter, in the present specification, one scale of a block representing the header structure including FIG. 7 represents one bit and the horizontal column represents one byte, respectively, and are arranged in order from the most significant bit MSB to the least significant bit LSB. .

Referring to FIG. 7, six subheaders may be used in a MAC PDU together with a general MAC header. Subheaders for each MAC PDU are inserted after the generic MAC header. Description of each field included in the MAC header will be described below.

The HT (Header Type) field indicates a header type and indicates whether the corresponding MAC PDU is a general MAC header including a payload after the header or a signaling header for controlling a bandwidth request. The EC (Encryption Control) field indicates encryption control and indicates whether the payload is encrypted. The Type field indicates whether there is a subheader following the header and the type of subheader. The Extended Subheader Field (ESF) field indicates the presence or absence of an extended subheader after the header.

In addition, the CI (CRC Indication) field indicates whether the CRC is attached after the payload. The Encryption Key Sequence (EKS) field indicates an encryption key sequence number used for encryption when the payload is encrypted. The LEN (LENgth) field indicates the length of the MAC PDU. The Connection Identifier (CID) field indicates a connection identifier on which a MAC PDU is delivered. A connection is used as an identifier of a MAC layer for data and message transfer between a base station and a terminal, and the CID identifies a specific terminal or identifies a specific service between the base station and the terminal. The Header Check Sequence (HCS) is used to detect errors in the header. In FIG. 7, the number in parentheses after the name of each field indicates the number of bits occupied by each field.

In the present invention, when there are a plurality of MAC SDUs corresponding to a plurality of different connections, a plurality of MAC SDUs generated from each MAC SDU to solve the problem of resource waste due to duplication of PN and ICV values Proposes a method of including a in one MAC PDU. To this end, it proposes that a MAC PDU includes a plurality of MAC SDUs, and provides a multiplexing MAC header that can provide information on the number of MAC SDUs included in the MAC PDU. In the present specification, the multiplexed MAC header may be referred to as 'multiplexing header', 'multiplexing header' or 'MH' for convenience.

8 illustrates an example of a 2 byte size Generic MAC Header (GMH) that can be used in embodiments of the present invention. Description of each field included in the MAC header shown in FIG. 8 will be described below.

First, a flow ID field is a field indicating a flow connection identifier, and a predetermined portion of the flow identifier may be used to indicate specific information. For example, when the flow identifier field is set to one specific value (e.g. 0x0), this may indicate a signaling header. In addition, if the flow identifier field is set to any one of the predetermined values (e.g. 0x3 to 0xf), this may indicate the flow identifier of the general MAC header. The Extended Header (EH) field indicates whether an extended header is included after the MAC header. The Length field indicates the size of the payload accompanying the MAC PDU or MAC header.

9 illustrates an example of a multiplexed MAC header structure that can be used in embodiments of the present invention.

Referring to FIG. 9, the default size of the multiplexed MAC header is 1 byte, and description of each field is described below.

First, a flow ID field indicates a flow identifier. In addition, the Flow ID field may be set to a specific flow identifier (e.g. 0b0001) set in advance to indicate that the Flow ID field is used as a multiplexed MAC header. The Extended Header (EH) field indicates whether an extended header is included behind the multiplexed MAC head, and may play a role similar to the SHI (SubHeader Indicator) or ESF field of the general MAC header.

The NOF (Number Of Flow ID) field indicates the number of flow IDs included in the multiplexed MAC header. That is, it may indicate how many MAC SDUs are included in the MAC PDU. For example, as shown in FIG. 9, when it is set to '0b001', 1 may be set, and when it is set to '0b111', 7 may be represented. If the NOF field is set to '0b000', the NOF field may indicate that an extended NOF field is included after the multiplexed MAC header. Of course, this setting is exemplary, and the bit indicating that an extended NOF is involved may be set differently. The NOF field may be represented as 'NOF MSB'.

The extended NOF field (Extended NOF or NOF LSB) may be followed by the MH with a preset size when the NOF field is set to a bit indicating that the extended NOF field is involved, such as 0b000. When the extended NOF field is included in the MH, the value of the extended NOF field indicates the number of flow connections (or the number of GMHs) included in the MH. Preferably, the extended NOF field may have a value of 4 bits or 8 bits.

10 illustrates an example of a MAC PDU using a multiplex header that can be used in embodiments of the present invention. In FIG. 10, it is assumed that MAC SDUs for three different flow connections configure one PDU using a multiplex header.

First, referring to FIG. 10A, a multiplexing header (MH) indicating that a MAC SDU for a plurality of different flow connections is included in a MAC PDU may be located at the front of the MAC PDU. Since the MAC PDU includes three MAC SDUs, the NOF field of the MH may be set to 3 (i.e. 0b011). Unlike the case of FIG. 4 described above, as MH is used, one security information pair, that is, PN and ICV, may be used in pairs in one MAC PDU.

In addition, a generic MAC header (GMH) for each of the three MAC SDUs and MAC SDUs may be located between the PN and the ICV. In this case, GMHs may be arranged in order, and then MAC SDUs may be arranged in order. The CRC may be optionally located at the end of the MAC PDU. If a plurality of MAC SDUs exist for one flow connection, a fragment and packing extended header may be included in the GMH of the MAC SDU.

Next, referring to FIG. 10 (b), the configuration of the MAC PDU is similar to that of FIG. 10 (a), but the arrangement of the MAC SDU and GMHs for the same is different. That is, in FIG. 10 (a), MAC SDUs are located after GMHs. In FIG. 10 (b), GMHs and MAC SDUs thereof are paired in order. In other words, the GMH No. 1 may be followed by the MAC SDU No. 1, followed by the GMH No. 2 and the MAC SDU No. 2 pairs.

11 shows another example of a multiplexed MAC header that can be used in embodiments of the present invention.

Referring to FIG. 11, the basic size of the multiplexed MAC header (MH) is 1 byte and may be extended to 2 bytes. Description of each field is described in detail below.

First, a flow ID field indicates a flow identifier, and a preset specific flow identifier (e.g. 0b0001) may be used to indicate that the MAC header is used as a multiplexed MAC header. The Extended Header (EH) field indicates whether an extended header is included behind the multiplexed MAC head, and may play a role similar to the SHI (SubHeader Indicator) or ESF field of the general MAC header.

The NOF (Number Of Flow ID) field indicates the number of flow IDs included in the multiplexed MAC header. That is, it may indicate how many MAC SDUs are included in the MAC PDU. For example, as shown in FIG. 11, when the NOF field has a size of 2 bits, it may indicate 1 when it is set to '0b00' and 4 when it is set to '0b11'. If more than 4 MAC SDUs are included in the MAC PDU, the NE field and the NOF LSB field described later may be used. Here, the NOF field may be expressed as 'NOF MSB'.

The NE (NOF Extend) field is a field indicating whether the NOF field is extended, and when set to 1, it carries a lower NOF (NOF Least Significant Bit) field. When the NOF LSB field is involved, the NOF LSB field may indicate the number of flow identifiers (or the number of MAC SDUs included in the MAC PDU) together with the NOF field. That is, when the NOF field has a length of 2 bits and the NOF LSB field has a length of 8 bits, the length of the two fields is summed to represent the number of flow identifiers (or flow concatenations) with a total length of 10 bits. Preferably, the extended NOF field may have a value of 4 bits or 8 bits.

12 shows another example of a multiplexed MAC header that can be used in embodiments of the present invention.

12, the default size of the multiplexed MAC header (MH) is 1 byte, the description of each field will be described in detail below.

First, a flow ID field indicates a flow identifier, and a preset specific flow identifier (e.g. 0b0001) may be used to indicate that it is used as a multiplexed MAC header.

The NOF (Number Of Flow ID) field indicates the number of flow IDs included in the multiplexed MAC header. That is, it may indicate how many MAC SDUs are included in the MAC PDU. For example, as shown in FIG. 12, when it is set to '0b0000', 1 may be set, and when it is set to '0b1111', 16 may be represented.

13 shows another example of a PDU configuration using the multiplexed MAC header described in embodiments of the present invention. In FIG. 13, it is assumed that the GMH proposed in FIG. 8 is used.

Referring to FIG. 13, MAC SDUs for each of three different flow connections are included in one MAC PDU using a multiplexed MAC header. Therefore, the NOF field of the MH may be set to 3 (e.g. Ob011). Behind the MH, GMHs for each flow connection can be placed in order. If an extended header for the GMH is used, the EH field of the corresponding GMH may be set to '1'. The extension header for the GMH can be located after the GMH. If an extension header is used, the extension header may not be encrypted. In this case, GMHs including extension fields are placed before the PN. This is because encryption is performed only on the information between the PN and the ICV.

Meanwhile, GMHs located behind the MH may have an extended header type. This will be described with reference to FIG. 14.

14 shows an example of an extension header of a multiplexed MAC header composed of GMHs in the configuration of a MAC PDU using the multiplexed MAC header described in embodiments of the present invention. In FIG. 14, it is assumed that the GMH proposed in FIG. 8 is used, and the multiplexed MAC header of FIG. 9 or 11 is used.

Referring to FIG. 14, a first field indicating the presence of another extension header and a type field indicating the extension header of the MH may be located in the first byte of the MH extension header. After the first byte, the GMH having a size of 2 bytes may be sequentially arranged as much as the value of the NOF field of the MH.

15 illustrates an example of a configuration of a MAC PDU using an extension header of a multiplexed MAC header and a multiplexed MAC header described in embodiments of the present invention. In FIG. 15, it is assumed that the MH structure described in FIG. 9 and the GMH structure proposed in FIG. 8 are used, respectively. Also assume that three MAC SDUs constitute one MAC PDU.

Referring to FIG. 15, a multiplexed MAC header (MH) may be placed first. The Flow ID field may be set to 0b001, which is a specific bit indicating MH, and the EH field is set to 1 since GMHs are included in the extension header. In addition, since three MAC SDUs are included, the NOF field is set to 3, and accordingly, the extended NOF field is unnecessary and thus may be omitted.

As the EH field is set to 1, the byte following the MH may include a last field and a type field indicating that the extension header of the MH is shown in FIG. 14.

The next six bytes can be followed by three GMHs of size two bytes. If an extended header for the third GMH is involved, the EH field of the third GMH may be set to one. Accordingly, the next byte of the third GMH may include a last field and a type field indicating the extension header of the GMH, and the next byte may include the contents of the extended header.

The MAC SDUs may be followed by the MH and the extension header, or a RollOver Counter (ROC) or a Packet Number (PN) may precede the MAC SDU when encryption is applied.

Meanwhile, if a plurality of MAC SDUs exist for one flow connection, the fragment and packing extended header may be accompanied in the GMH of the MAC SDU as described above. .

The MAC PDU using the multiplexed MAC header, which may be configured as described above, may be generated at the transmitter and transmitted to the receiver.

In addition, the MAC PDU using the multiplexed MAC header, which can be configured as described above, may be generated through the MAC PDU generating unit of the transmitting apparatus that can be used in the wireless communication system and transmitted to the receiving apparatus. This will be described with reference to FIG. 16.

16 illustrates an example of a structure of a MAC PDU generation unit in a transmitting apparatus according to another embodiment of the present invention.

Referring to FIG. 16, a MAC PDU generation unit in a transmitting device may include a MAC control unit 10, a higher layer control unit 12, a header generation unit 14, and a multiplexer 16.

The upper layer control unit 12 is a module in charge of controlling the upper layer of the MAC layer. The upper layer control unit 12 transmits a MAC SDU to be transmitted to the multiplexer 16 and generates information (eg flow identifier, length information, etc.) required for generating a header of the MAC SDU to be transmitted. ) May be provided to the header generator 14.

If there is a MAC SDU for controlling the MAC protocol, the MAC controller 10 transmits the MAC SDU to the multiplexer 16 and provides the header generator 14 with information required for generating a header for the MAC SDU for control. Can be.

The header generator 14 receives the flow identifier information and the length information of the MAC SDU transmitted from the upper layer controller 12 and the MAC controller 10, and includes a plurality of MACs for different flow connections. It can be recognized that an SDU exists. Accordingly, the general MAC header (GMH) and the multiplexed MAC header (MH) can be generated using the received information. At this point, the multiplexed MAC header and GMH may follow one or more of the configurations described in FIGS. 7-15 described above.

The multiplexer 16 may generate and output a MAC PDU by multiplexing the GMH, the multiplexed MAC header, and the MAC SDUs received in the order under the control of the header generator 14. In this case, when the MAC PDU is encrypted, the multiplexer 16 may attach the PN and the ICV to the generated MAC PDU. Multiplexer 16 may also attach a CRC to the generated MAC PDU.

As another embodiment of the present invention, a terminal and a base station (FBS, MBS) in which the embodiments of the present invention described in FIGS.

The terminal may operate as a transmitting device in uplink and as a receiving device in downlink. In addition, the base station may operate as a receiving device in the uplink, and may operate as a transmitting device in the downlink. That is, the terminal and the base station may include a transmitting device and a receiving device for transmitting information or data.

The transmitting device and the receiving device may include a processor, a module, a part and / or a means for performing the embodiments of the present invention. In particular, the transmitting device and the receiving device may include a module (means) for encrypting a message, a module for interpreting an encrypted message, an antenna for transmitting and receiving a message, and the like.

The terminal used in the embodiments of the present invention may include a low power RF (Radio Frequency) / IF (Intermediate Frequency) module in addition to the MAC PDU generation unit described above. In addition, the terminal is a controller function, a MAC (Medium Access Control) frame variable control function, a handover function, authentication and encryption function, data according to the controller function, service characteristics and propagation environment for performing the above-described embodiments of the present invention. Means, modules or parts for performing packet modulation and demodulation, high speed packet channel coding, and real-time modem control for transmission.

The base station may transmit data received from the upper layer to the terminal by wireless or wired. The base station may include a low power radio frequency (RF) / intermediate frequency (IF) module. In addition, the base station is a controller function for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing function MAC frame variable control function according to service characteristics and propagation environment, high speed traffic real time control function, hand over function, authentication and encryption function, packet modulation and demodulation function for data transmission, high speed packet channel coding function and real time modem control Means, modules or parts for performing functions and the like.

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

1 is a diagram illustrating an example of a commonly used Internet protocol stack.

2 is a diagram illustrating the operation of each layer for data transmission generally used.

3 shows a hierarchical structure of a general IEEE 802.16 system.

4 illustrates a process of generating MAC PDUs for a plurality of MAC SDUs in a typical wireless wireless access system.

FIG. 5 is a diagram illustrating a connection and a service flow (SF) used in an IEEE 802.16 system.

FIG. 6 is a diagram illustrating an example of a MAC PDU (MAC Protocol Data Unit) type defined in a wireless MAN mobile communication system based on an IEEE 802.16 system.

7 illustrates an example of a MAC header type used in a wireless MAN mobile communication system based on a generally used IEEE 802.16 system.

8 illustrates an example of a 2 byte size Generic MAC Header (GMH) that can be used in embodiments of the present invention.

9 illustrates an example of a multiplexed MAC header structure that can be used in embodiments of the present invention.

10 illustrates an example of a MAC PDU using a multiplex header that can be used in embodiments of the present invention.

11 shows another example of a multiplexed MAC header that can be used in embodiments of the present invention.

12 shows another example of a multiplexed MAC header that can be used in embodiments of the present invention.

13 shows another example of a PDU configuration using the multiplexed MAC header described in embodiments of the present invention.

14 shows an example of an extension header of a multiplexed MAC header composed of GMHs in the configuration of a MAC PDU using the multiplexed MAC header described in embodiments of the present invention.

15 illustrates an example of a configuration of a MAC PDU using an extension header of a multiplexed MAC header and a multiplexed MAC header described in embodiments of the present invention.

16 illustrates an example of a structure of a MAC PDU generation unit in a transmitting apparatus according to another embodiment of the present invention.

Claims (15)

In the method for efficiently transmitting a medium access control protocol data unit (MAC PDU) in the transmitting end, A plurality of medium access control service data units (MAC SDUs) and the plurality of MAC SDUs corresponding to each of a plurality of different flow connections for one transmitting end are included in one MAC PDU. Generating a MAC PDU comprising a multiplexing MAC header indicating multiplexing; And And transmitting the generated MAC PDU to a receiving end. The method of claim 1, The MAC PDU is, Further comprising at least one of one security information for the entirety of the plurality of MAC SDU and a generic MAC header for each of the plurality of MAC SDU, And the security information comprises a packet number (PN) field and an integrity check value (ICV) field. 3. The method of claim 2, The multiplexed MAC header, A flow identifier (flow ID) field and a number of flow ID (NOF) field indicating the number of MAC SDUs for the one transmitter, The flow identifier field is The medium access control protocol data unit transmission method, characterized in that, if the specified bit is set to indicate a multiplexed MAC header. The method of claim 3, wherein The multiplexed MAC header, And an extended number of flow ID (extended number of flow ID) field of a predetermined size if the flow identifier number field is set to a specific bit. The method of claim 3, wherein The multiplexed MAC header, And a header extension (EH) field indicating whether there is an extension header. The method of claim 5, The multiplexed MAC header, It further includes a flow identifier number extension (NE: field), If the flow identifier number extension field is set to a predetermined value, further includes a NOF LSB (Number Of Flow ID Least Significant Bit) field of a predetermined size. The lower flow identifier flow number field, And a flow identifier number together with said flow identifier number field. 3. The method of claim 2, The multiplexed MAC header, A medium access control protocol data unit transmission method, characterized in that located in front of the MAC PDU. The method of claim 5, If the extension header (EH) field is set, The MAC PDU further includes an extended header including a type field indicating that the multiplexed MAC header is an extended header. Generic MAC header for each of the plurality of MAC SDU, The medium access control protocol data unit transmission method, characterized in that located after the extension header. The method of claim 8, The extension header, And a last field indicating the presence of another extension header. 3. The method of claim 2, The general MAC header for each of the plurality of MAC SDUs and the plurality of MAC SDUs, And transmitting the packet number (PN) between the packet number (PN) and the integrity check value (ICV) in the MAC PDU. The method of claim 10, General MAC header for each of the plurality of MAC SDU, The medium access control protocol data unit transmission method, characterized in that located in the MAC PDU next to the plurality of MAC SDU. The method of claim 11, General MAC header for each of the plurality of MAC SDU, And transmitting a pair in an order corresponding to each other in the MAC PDU. A transmitting apparatus for generating a medium access control protocol data unit (MAC PDU) in a wireless access system, Multiple MAC SDUs are multiplexed into one MAC PDU in a plurality of Medium Access Control Service Data Units (MAC SDUs) corresponding to different flow connections for one transmitting end. And a MAC PDU generation unit to generate a MAC PDU by attaching a multiplexing MAC header. The method of claim 13, The MAC PDU generation unit, One security information for the plurality of MAC SDUs and a generic MAC header for each of the plurality of MAC SDUs are further attached, The security information, And a packet number (PN) field and an Integrity check value (ICV) field. 15. The method of claim 14, The MAC PDU generation unit, A MAC PDU is generated to include a flow ID field indicating that the multiplexed MAC header is a multiplexed MAC header and a number of flow ID (NOF) field indicating the number of MAC SDUs for the one transmitter. A transmitting device, characterized in that.

Images