KR20060069378A - Data format structure and method of formatting signals in communication system - Google Patents

Abstract

The protocol data unit structure in the communication system according to the present invention is higher in the structure of a protocol data unit (PDU) generated in a medium access control (MAC) layer on the transmitting side of the communication system. At least two service data units (SDUs) delivered from the layer; And at least two MAC headers providing control information of each of the at least two service data units.

Mobile communication, signal format, extended area, data area

Description

Data format structure and method of formatting signals in communication system

1A and 1B illustrate a signal format method in a signal format method in a mobile communication system according to the prior art;

2 is a diagram illustrating a signal transmission state applied to a signal format method in a mobile communication system according to the present invention.

3 is a diagram illustrating a format state of a header according to a signal format method in a mobile communication system according to the present invention;

The present invention relates to a communication system, and more particularly, to a data format structure and a signal format method at one layer of a transmitting side of a communication system.

Hereinafter, a signal format method in a mobile communication system according to the prior art will be described with reference to the accompanying drawings.

1A and 1B are diagrams illustrating a signal format method in a signal format method in a mobile communication system according to the prior art. FIG. 1A is a format method when no signal is retransmitted, and FIG. 1B is a signal retransmission method. The format of the case.

A signal format method in a mobile communication system according to the related art configured as described above will be described in detail with reference to the accompanying drawings.

First, in case of attempting to transmit service data composed of a plurality of payload units (hereinafter, abbreviated as PUs) in the upper layer of the mobile station during communication between the mobile station and the network in the mobile communication system, in layer 2, the plurality of PUs are transmitted. Multiplexing headers for separating the formed service data into a predetermined size to fit the transmission rate, attaching a segmentation and reassemly header for reassembling them, and then multiplexing them into respective transport channels ( add multiplexing headers.

That is, in the Layer 2 RLC-C PDU (Radio Link Control-Control Plane Protocol Data Unit), the service data consisting of the plurality of PUs is separated into PU units and converted into a predetermined size (RLC-C SDU; Service Data Unit). Attach a segmentation and reassemly header to reassemble it.

Then, in the MAC-PDU of Layer 2, a plurality of RLC-C SDUs having the segmentation and reassemly headers are converted into a plurality of MAC-SDUs, and then multiplexed to each transport channel. Attach a multiplexing header.

Here, as shown in FIG. 1A, for service data that does not want to be retransmitted, it is possible to convert a plurality of RLC-C PDUs into a plurality of MAC-SDUs having a single multiplexing header in the MAC-PDU. As shown in FIG. 1B, for service data that needs to be retransmitted, it is possible to convert a plurality of RLC-C PDUs into one MAC-SDU attached to one multiplexing header in the MAC-PDU.

Subsequently, the physical layer receives a plurality of MAC-SDUs having multiplexing headers, that is, transport blocks, and attaches CRCs for error checking in the physical layer, and then attaches each transport channel. Wirelessly).

Accordingly, the present invention has been made to implement the function of the effective MAC sublayer, the signal in the mobile communication system for peer-to-peer communication between the MAC sublayer in the mobile communication system The purpose is to provide a format structure.

A characteristic of a signal format method in a mobile communication system according to the present invention for achieving the above object is a signal format method in a mobile communication system in which a MAC header is added to data when transmitting data between a mobile station and a network. The MAC header is a Mobile Identifier area for identification in a usage band, and a MAC-Service Access Point Identifier area (MAC-) for multiplexing a logical channel of data to which the MAC header is added. SAP Identifier, an RLC-U Identifier area for multiplexing the radio link control (RLC) of the multi-user plan, and a MAC-service data unit length (Length of MAC_SDU) for transmitting the data. Information and contention resolution of the domain and the extension of the MAC-SDU It consists of a Frame Format Identifier area for ention resolution.

Another feature of the signal format method in the mobile communication system according to the present invention for achieving the above object is, the frame format identifier (Frame Format Identifier) area is the information format for transmitting information of the upper layer (Information) format, and one of a command format for contention resolution and a response format.

The protocol data unit structure according to the present invention is a structure of a protocol data unit (PDU) generated in a medium access control (MAC) layer of a transmitting side of a communication system, and is transmitted from a higher layer. And at least two service data units (SDUs) and at least two MAC headers for providing respective control information of the at least two service data units.

In the signal format method according to the present invention, in the signal format method in a transmission-side medium access control layer of a communication system, receiving a service data from a higher layer, and at least two or more configured by at least a portion of the service data And configuring a MAC Protocol Data Unit (PDU) including a Service Data Unit (MAC-SDU) and a header having an area indicating information related to the number of at least two MAC-SDUs. It is characterized by.

The data format structure according to the present invention is a data format structure generated in a specific layer on the transmitting side in a communication system, comprising: a data region consisting of data transferred from an upper layer and information related to the length of the data region; And a header having a length region provided and an extension region supplementing information provided by the length region.

Hereinafter, a preferred embodiment of a signal format method in a mobile communication system according to the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating a signal transmission state applied to a signal format method in a mobile communication system according to the present invention, and FIG. 3 is a diagram illustrating a format state of a header according to a signal format method in a mobile communication system according to the present invention. Drawing.

The signal format method in the mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

First, a service access point (hereinafter abbreviated as SAP) is used to transmit service data in radio resource control (RRC: hereinafter referred to as RRC), which is an upper layer in communication between a mobile station and a network in a mobile communication system. To the MAC sublayer through SCCH (TD), Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), and Common Control Channel (CCCH) of logical channels. send.

In addition, in RLC_C, service data of the RRC is transmitted to a MAC sublayer through a dedicated control channel (DCCH) of a logical channel, which is the service access point (hereinafter, referred to as SAP). do.

In addition, the service data transmitted from the Logical Access Control (LAC) is a logical channel of the service access point (hereinafter referred to as SAP) through a Radio Link Control-User plane (RLC-U). It is transmitted to a MAC sublayer through a dedicated traffic channel (DTCH).

Then, as shown in FIGS. 1A and 1B, a MAC (MAC) sublayer separates service data including a plurality of Payload Units (PUs) into predetermined sizes to match a transmission rate. After that, a segmentation and reassemly header for reassembling them is attached, and then a multiplexing header for multiplexing to each transport channel.

In this case, the MAC header including the segmentation and reassemly header and the multiplexing header has a format as shown in FIG. 3.

That is, the MAC header includes a Mobile Identifier area, a MAC-SAP Identifier, an RLC-U Identifier area, and a Mac-Service Data Unit. It consists of a Length of MAC_SDU area, an Extension of MAC-SDU area, and a Frame Format Identifier area.

The Mobile Identifier area may be used when a specific mobile station (MS) is addressed with a common downlink channel or when the mobile station (MS) uses a random access channel (MS). As an area for in-band identification, the responsibility for user identification rests with the MAC sublayer.

That is, if there is an RRC connection, the Radio Network Temporary Identity (abbreviated as RNTI) is used. If the RRC is not connected, the Random Radio Network Temporary Identity (hereinafter abbreviated as RNTI). It indicates that it becomes respectively.

The MAC-SAP Identifier is a MAC-SAP Identifier that the MAC sublayer multiplexes the logical channel transmitted through the MAC-SAP from the upper layer to the corresponding transport channel of Layer 1 and transmits from Layer 1 It indicates that the transport block received on the port channel is demultiplexed to the corresponding MAC-SAP.

For example, the DCCH-SAP or DTCH-SAP is routed to the transport block of DSCH / DCH, and the transport block of the DSCH / DCH is routed to DCCH-SAP or DTCH-SAP.

The RLC-U Identifier region becomes an RLC-U entity in the case of DTCH-SAP, indicating that the MAC sublayer demultiplexes the transport block transmitted in the physical layer to each RLC-Us. .

The length of the MAC-Service Data Unit (Length of MAC_SDU) area indicates the length of the MAC SDU and may indicate that the size of the MAC SDU changes.

The Extension of MAC-SDU area serves to accurately determine the length of the MAC SDU by supplementing the MAC-Service Data Unit Length area, and indicates that the MAC PDU has multiple MAC SDUs. Can be indicated. The number of MAC-SDUs indicates when there is only one header for multiple MAC SDUs, as shown in Table 1 below.

MAC header MAC-SDU MAC-SDU MAC-SDU Fill bits

Further, the extension of the MAC-SDU, which then indicates whether or not the MAC-SDU is present, indicates that each MAC-SDU has a MAC header, as shown in Tables 2A and 2B below.

MAC header MAC header MAC header MAC-SDU MAC-SDU MAC-SDU

MAC header MAC-SDU MAC header MAC-SDU MAC header MAC-SDU

In the ARQ service that does not require retransmission, multiple MAC SDUs are not required.

The Frame Format Identifier area represents information transmission and contention resolution, and includes three formats: an information format, a command format, and a response format. It takes one of its forms.

The information format is used for transmitting information of a higher layer, and the command format and response format are used for contention resolution.

That is, a MAC sublayer that receives a command format included in a MAC-SDU from a peer entity transmits a response format having the same value as the MAC_SDU received in the command format. do.

A header format method in the MAC sublayer as described above is shown in Table 3 below.

Where ● is the MAC of the Transport Channels of BCH (Broadcast Channel), PCH (Paging Channel), FACH / RACH (Forward Access Channel / Random Access Channel), DSCH (Downlink Shared Channel) and DCH (Dedicated Channel). It shows transport channels that can use each area of the header.

PDU field Funtions (Services) associated Transport channels BCH PCH FACH / RACH DSCH DCH MAC header Mobile identifier In-band identification ● ● MAC-SAPs identifier Multiplexing logical channels ● ● ● RLC-Us identifier Multiplexing multiple RLC-Us ● ● ● Length of MAC-SDU Data transfer ● ● ● ● ● Extention of MAC_SDU (Number of MAC-SDU) Data transfer ● ● ● ● ● Frame format identifier Contention resolution ● ● ● ● ● MAC-SDU Data transfer ● ● ● ● ● Fill bits Fitting the transport block size ● ● ● ● ●

Here, MAC-SDU is data corresponding to the PDU of the upper layer, Fill bits are used for the size of the MAC-PDU in the size of the transport block.

In the MAC sublayer, a header is formatted as described above and converted into a transport block having a predetermined size that can be accommodated by a physical layer. The SCH (Synchronization Channel) and the first CCPCH (Primary) It transmits to the network through any one of the physical channel (Physical Channel) of the Common Control Channel (CDR), the second CCPCH, Physical Random Access Channel (PRACH), Dedicated Phsical Data Channel (DPDCH).

As described above, the signal format method in the mobile communication system according to the present invention performs peer-to-peer communication and MAC sublayer on a MAC sublayer. Provides an effective way to support functions to be done.

As shown in Table 3, the function includes an in-band identifier, multiplexing logical channels, and multiplexing multiple radio link control-user plans (Multiplexing multiple RLC-Us). ), Data transfer, and contention resolution.

Claims (14)

In the structure of the protocol data unit (PDU) generated in the medium access control (MAC) layer of the transmitting side of the communication system, At least two service data units (SDUs) delivered from higher layers; And At least two MAC headers providing control information for each of the at least two service data units. The method of claim 1, The at least two MAC headers are located in front of the at least two service data units. The method of claim 2, The order of each MAC header is the same as the order of each service data unit corresponding to the control information provided by each MAC header. The method of claim 3, Each MAC header is located in front of each service data unit corresponding to the control information provided by each MAC header. The method of claim 4, wherein Each MAC header comprising a MAC-SDU length region indicating the size of a corresponding service data unit. The method of claim 1, Each MAC header comprising an identifier area for identifying a corresponding service data unit. The method of claim 1, And said at least two service data units comprise different types of data. The method of claim 1, Each MAC header comprising an area identifying a logical channel through which a corresponding service data unit is transmitted. The method of claim 8, Wherein each MAC header further comprises an area indicating a size of a corresponding service data unit. A signal format method in a medium access control (MAC) layer of a communication system, Receiving service data from an upper layer; And MAC PDU including at least two MAC-SDUs (Service Data Units) configured by at least a portion of the service data, and a header having an area indicating information related to the number of the at least two MAC-SDUs. And configuring a Protocol Data Unit. In a data format structure generated at a specific layer of a transmitting side in a communication system, A data area comprising data transferred from an upper layer; And And a header having a length region for providing information related to the length of the data region and an extension region for supplementing the information provided by the length region. The method of claim 11, The header further comprises a 'Fill bits' area used for the transport block size of the service data unit. The method of claim 11, The header further comprises a frame format identifier area indicating information transmission. The method of claim 11, The extended area is a data format structure, characterized in that to supplement the length area to accurately determine the length of the data area.

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