KR100370420B1 - Method for dynamic transport channel switching and control signal transporting by controlling MAC in HSDPA system - Google Patents

Abstract

The present invention relates to MAC (Media Access Control) when switching between HS downlink channel (HS-DSCH) and other transport channels in a system employing HSDPA (High Speed Downlink Packet Access) technology in 3GPP asynchronous (UMTS). The present invention relates to a dynamic transmission channel switching and a method applicable to the control signal transmission method.

The present invention provides a mobile communication system for setting a switchable transport channel combination for a transport channel by a radio resource control layer (RRC) to perform high-speed data transmission, wherein a medium access control layer (MAC) is set within the transport channel combination setting range. It is characterized in that the switching of the transport channel by ().

Therefore, according to the present invention, when switching between HS-DSCH and other transport channels according to the size of data to be transmitted, additional control information and transmission delay are minimized because only MAC control is possible without RRC control. Can be.

Description

Method for dynamic transport channel switching and control signal transporting by controlling MAC in HSDPA system

The present invention relates to a method of switching a transmission channel according to a service in a 3GPP asynchronous (UMTS) mobile communication system, in particular a HS downlink channel (HS-DSCH) (HS-DSCH) (High Speed Downlink Packet Access) Dynamic Channel Switching by Medium Access Control (MAC) and the Applicable Method to the Control Signal Information Transmission Method When Switching Channels Between a Speed Downlink Shared Channel and Other Transport Channels will be.

In more detail, when the transmission channel is switched between the HS-DSCH and another transport channel according to the size of data to be transmitted, the additional control information and transmission can be performed by enabling dynamic switching only by controlling the MAC without controlling the RRC. The present invention relates to a dynamic transmission channel switching method that enables a delay to be minimized, and a method of allowing each combination and switching examples for the dynamic transmission channel switching to be applicable to the HS-DSCH control signal transmission method.

In general, ARIB in Japan, ETSI in Europe, T1 in USA, TTA in Korea, and TTC in Japan have been developed through the project called Third Generation Partnership Project (hereinafter abbreviated as 3GPP). A third generation mobile communication system that can provide such multimedia services in a wireless environment is under development.

Next-generation mobile communication technology through 3GPP aims to provide high-speed data service by introducing and developing management technique of GSM (Global System for Mobile Communications) network and Code Division Multiple Access (CDMA) technology. I am doing it.

3GPP supports the activities of five Technical Specification Groups (hereinafter abbreviated as TSG) for fast and efficient project operation and technology development, and each TSG has a set of standards related to the assigned area. Responsible for development, approval, and management. Among them, the Radio Access Network (RAN) group aims to define a new radio access network in the third generation mobile communication system, and abbreviated as a mobile station and a Universal Mobile Telecommunications Network Terrestrial Radio Access Network (hereinafter referred to as UTRAN). Develop specifications for the functionality, requirements, and interfaces of

The TSG-RAN Group is again composed of a Plenary Group and four Working Groups. Working Group 1 (WG1) develops standards for the Physical Layer (WG1), while the second Working Group (WG2) works with the Data Link Layer (2nd Layer) and Network Layer (WG2). Role of the third tier). In addition, the third operation group defines standards for interfaces between base stations, radio network controllers (hereinafter referred to as RNCs), and core networks in the UTRAN, and the fourth operation group defines radio link performance. Discuss requirements and requirements for radio resource management.

1 is a block diagram of a 3GPP UMTS (asynchronous) system to which the prior art and the present invention are applied.

For example, the user equipment (UE) 10 may be a mobile station (MS) of mobile communication, a base station 20a (Node B), a control station 20b (RNC; Radio Network Controller) and the control station. A diagram showing a universal terrestrial radio access network (UTRAN) 20 including a control station manager 20c (BSM, Base Station Manager) for managing.

In the above configuration, each RNC is connected to a large number of base stations Node Bs.

2 shows a structure of a radio interface protocol according to the 3GPP radio access network standard.

The air interface protocol between the user equipment and the UTRAN consists of a physical layer, a data link layer, and a network layer horizontally, and vertically, the protocol structure includes a control plane and data for transmitting control signals. It is divided into a user plane for transmitting information.

More specifically, referring to FIG. 2, a control layer includes a radio resource control layer (hereinafter, referred to as RRC) as a third layer and a radio link control layer in a second layer. Layer (hereinafter, abbreviated as RLC) and Medium Access Control Layer (hereinafter, abbreviated as MAC), and a physical layer is a first layer.

In the user plane, RLC and MAC are in the second layer, and the physical layer is at the lowest level.

The physical layer provides an information transfer service to a higher layer using various wireless transmission technologies.

The upper MAC layer is connected through a transport channel, and data between the MAC layer and the physical layer moves through the transport channel. The transport channel is divided into a dedicated transport channel (DTCH) and a common transport channel (CTCH), respectively, depending on whether the mobile station is exclusively available or shared by multiple mobile stations.

The MAC layer is connected to the RLC layer by a logical channel, and various logical channels are provided according to the type of information to be transmitted. In general, a control channel is used for transmitting control plane information, and a traffic channel is used for transmitting user plane information.

In addition, the MAC layer provides a reallocation service of radio resources and MAC parameters. This service is performed when the RRC requests reallocation of radio resources or changes of MAC parameters.

The RLC layer provides a radio link establishment and release service. In addition, it performs a segmentation and reassembly function related to an RLC Service Data Unit (hereinafter, abbreviated as SDU) from a higher layer of the user plane.

The RLC SDU is sized to fit the processing capacity in the RLC layer and then header information is added to the MAC layer in the form of a Protocol Data Unit (hereinafter, abbreviated as PDU). At this time, the RLC layer has an RLC buffer for storing the RLC PDUs from the upper layer.

The RRC provides an information broadcast service that broadcasts information to all mobile stations located in an arbitrary area.

It is also responsible for control plane signal processing for control signal exchange in the third layer, and has a function of setting, maintaining and releasing radio resources between the mobile station and the UTRAN.

In particular, the RRC has a function of setting, maintaining, and releasing a radio access bearer, and allocating, relocating, or releasing radio resources required for radio resource access. (The bearer can then be thought of as a defined capability for signaling on the air interface).

Each mobile station includes all radio interface layers, but in UTRAN these protocol layers are separated by radio access network components.

Each protocol layer responsible node is shown in FIG. 3 and will be referred to FIG. 1.

Node B is responsible for the transmission and reception of radio resources with the mobile station and serves as a physical layer.

Node B is managed by the RNC, which is responsible for the management of radio resources. The RNC, which is in charge of Node B's direct management, is called Control RNC, and the CRNC is responsible for the management of public radio resources.

The place that manages dedicated radio resources assigned to each mobile station is called a serving RNC, and the RNC does not change even during handoff.

The control RNC (CRNC) and the responsible RNC (SRNC) may be the same, but the control RNC and the responsible RNC may be different when the mobile station moves out of the area of the responsible RNC and moves to another RNC to perform a soft handoff.

The interface between Node B and RNC is called Iub, and the interface between two RNCs is called Iur.

The MAC layer may be further divided into a MAC-d sublayer and a MAC-c / sh sublayer. The MAC-d sublayer manages a dedicated logical channel (DTCH) for a specific mobile station while in the responsible RNC as shown in FIG. 3, and the MAC-c / sh sublayer is located in the control RNC to manage a common transport channel (CTCH). do.

Since the MAC-c / sh sublayer manages a shared transport channel shared by all mobile stations in a cell, there exists one for each cell, and the MAC-d sublayer exists for each mobile station because it provides a dedicated service for the mobile station. .

4 shows the structure of the RLC layer and the MAC layer of the UTRAN side.

When data is transmitted using downlink, the RLC layer stores RLC PDUs in the RLC buffer when data comes down from an upper layer and sends down as many PDUs as required by the MAC layer.

The RLC PDU down to the MAC-d layer is transmitted on a dedicated transport channel or a shared transport channel through channel switching. In the case of transmission on a dedicated transport channel, a header associated with the MAC-d sublayer is attached and sent down to the physical layer through a dedicated channel (DCH).

However, when a common transport channel is allocated, it is transmitted from the MAC-d sublayer to the MAC-c / sh sublayer, and its associated header is attached and multiplexed with other logical channels to enable paging channel (PCH), forward access channel (FAC), and DSCH. It is sent on a shared transport channel such as (Downlink Shared Channel).

In the case of uplink, data is transmitted from a common transport channel such as a reverse access channel (RACH) and a common packet channel (CPCH) and a DCH and sent to a higher layer. In this case, it is transmitted to the RLC layer via a path opposite to the downlink.

For example, a case in which data is transmitted through a DSCH, which is a common transport channel, will be described with reference to FIG. 4.

Since the RLC PDU from the RLC layer uses a DSCH, it is transmitted to the MAC-c / sh sublayer through channel switching and control transmission multiplexing. Control transmission multiplexing is responsible for multiplexing multiple logical channels. Data transmitted to the MAC-c / sh sublayer is multiplexed with other logical channels.

In addition, in the common transport channel, various mobile station data can be transmitted, so that the identification table of the destination mobile station is added through multiplexing of the mobile station identification table to indicate the destination of the corresponding data. In this case, TCTF multiplexing is responsible for mapping between logical channels and transport channels. Data mapped to the DSCH transmission channel is transmitted to the DSCH through scheduling considering the priority of the mobile station.

Thereafter, a transport format that can be transmitted in the DSCH is determined, a code to be used is selected, and transmitted to the physical layer.

Hereinafter, a conventional technique for data transmission channel switching related to the present invention will be described.

First, a general description of the transmission method will be given.

3GPP's High Speed Downlink Packet Access (HSDPA) improves system performance by applying new prior art techniques in addition to Adaptive Modulation and Coding (AMC) and Hybrid Automatic Repeat reQuest (HARQ), thereby improving the performance of current 3GPP UMTS systems. It is a technique to make it suitable for transmission.

In general, a technique of transmitting data by changing a transmission power of a signal, a coding rate of a transmission data, or a modulation scheme in consideration of a rapidly changing channel environment is called link adaptation (LA).

Traditionally, the CDMA system utilizes a link adaptation (LA) technique through a fast power control scheme, but recently, the AMC technique has been applied as another alternative method.

AMC is a technique for changing the code rate and modulation scheme of transmission data in anticipation of the channel change. For example, if the channel environment is good, high-speed data is transmitted using 16 QAM and 3/4 code rate turbo coding. If the channel environment is bad, QPSK and 1/2 rate turbo coding are used. ) Is a method of transmitting data at a relatively low data rate. In HSDPA, AMC is used to compensate for long-term channel changes.

HARQ is a method of applying ARQ technique and Forward Error Correction (FEC) technique together.

HARQ is a method of viewing the reception gain by combining the signals together at the receiving side by decoding the coding used in the initial transmission and the coding used in the retransmission. Used to compensate for short-term channel changes in HSDPA.

A transport channel for transmitting high-speed data by applying the AMC and HARQ scheme in HSDPA is a High Speed Downlink Shared Channel (HS-DSCH), and the control function of the channel is an entity called MAC HS-DSCH. To perform.

5 is a protocol structure according to the HSDPA technology expressed mainly on the interface.

In HSDPA structure, MAC is largely responsible for MAC-D for Dedicated Channel, MAC-c / sh for Common Channel and Shared Channel, and HS-DSCH for HSDPA. MAC HS-DSCH.

In UTRAN, MAC-D is present in the Serving RNC (SRNC), the MAC-c / sh is in the Controlling RNC (CRNC), and the MAC HS-DSCH is in the Node B.

The MAC of a UE (User Equipment, Mobile Station) also includes these three MAC entities. In UTRAN, MAC-D is one per UE, and MAC-c / sh is one per cell. The HS-DSCH Frame Protocol (FP) performs a function of transmitting HS-DSCH transmission data through the Iub and Iur interfaces.

6 shows a MAC model of a conventional UTRAN.

Logical channels considered for HS-DSCH are Dedicated Traffic Channel (DTCH) for transmitting user data and Dedicated Control Channel (DCCH) for transmitting user-specific control information. HS-DSCH transmission data delivered to MAC by DTCH and DCCH in RLC are delivered to MAC HS-DSCH via MAC-D and MAC-c / sh.

As shown in the figure, MAC-D includes Transport Channel Switching, C / T MUX, Priority Setting, Downlink Scheduling / Priority Handling, It consists of ciphering, deciphering, and flow control.

Transmission channel switching is a function of switching the transmission channel according to a service. This feature enables channel switching from common channel to dedicated channel and from dedicated channel to common channel when the current traffic volume requires a new RB (Radio Bearer) setup.

The transport channel switching function is controlled by the RRC. The UTRAN RRC, reported by the Transport Channel Traffic Volume Measurement function that the traffic volume is above or below the threshold, resets the established mapping relationship between the logical channel and the transport channel and transmits the uplink or uplink transmission. You can switch channels.

The transport channel switching function is performed according to the RB configuration and reconfiguration, the transport channel configuration and reconfiguration, the physical channel configuration and reconfiguration procedure among the RRC procedures.

MAC-D also has Dynamic Transport Channel Switching. This function is flexible by switching between two channels, that is, data transferred from the upper layer between the DSCH and the DCH under the control of the MAC when one logical channel is simultaneously mapped to the transport channel DSCH and DCH by RRC control. It is a function that can be switched.

If the general transport channel switching function is controlled by the RRC, the dynamic transport channel switching function is controlled by the MAC only in the case of DSCH and DCH.

The C / T multiplexing function maps multiple logical channels into one transport channel.

The priority setting function performs a function of setting priority on data transmitted from DCCH / DTCH.

The downlink scheduling and priority processing function performs transmission scheduling of data to be carried on the downlink dedicated channel according to the priority of the logical channels.

This feature is related to the Transport Format Combination Selection function.

Encryption and de-encryption functions in the MAC are applied only to the RLC TM (Transparent Mode) which transmits the PDU transmitted from the upper layer without a header.

The flow control function is performed to facilitate data transfer on the Iur interface between the MAC-C / SH and the MAC-D to operate with a constant buffer size.

MAC-C / SH functions related to transport channel HS-DSCH are UE (user equipment) (mobile station) ID multiplexing (MUX) and flow control. UE ID multiplexing performs a function of putting a UE ID in a MAC header to distinguish a UE when information of a dedicated logical channel is transmitted through a common and shared transport channel. The flow control function facilitates data transfer on the Iur and Iub interfaces.

MAC-HS-DSCH includes flow control, HARQ, scheduling and priority processing, and TFC selection.

The flow control function facilitates the flow of data transmitted on the Iub interface.

The HARQ entity performs a HARQ function so that data of the HS-DSCH is transmitted without error. There is one HARQ entity per MAC-D. The scheduling and priority processing function adjusts the transmission scheduling according to the priority of the data processed in each HARQ entity. The TFC selection function performs a function of selecting a transmission rate, a modulation method, a coding method, etc. of data to be transmitted through the HS-DSCH.

7 shows a MAC model of a conventional UE. Data received at the HSDPA is delivered to the MAC-HS-DSCH, and delivered to the RLC via the MAC-C / SH and MAC-D. While the UTRAN is responsible for transmitting the HS-DSCH, the UE performs the function of receiving the HS-DSCH.

HARQ of the UE performs HARQ together with the HARQ function of the UTRAN. If the received data is in error, request retransmission. The UE ID Read function reads the UE ID contained in the MAC header and determines whether the data is own data. The C / T multiplexing function maps multiple logical channels to one transport channel. The UL TFCselection function is responsible for selecting a TFC of a dedicated transport channel.

In the HS-DSCH, an associated control signal must be transmitted together with the HS-DSCH data transmission. The control signal transmitted downward is used for the UE to receive transmission data of the HS-DSCH as HARQ-related control information and modulation and coding information of the HS-DSCH. The control signal transmitted upward is composed of HARQ-related control signals including transmission success notification or retransmission request information of the UE and AMC selection-related information including channel status report information of the UE.

HARQ-related information received in the UTRAN is used for the HARQ function in the MAC-HS-DSCH layer of the UTRAN. The AMC-related information received in the UTRAN is used for scheduling and priority processing functions in the MAC-HS-DSCH layer of the UTRAN. The control signal information is completed in the MAC HS-DSCH layer.

There are three ways of transmitting the HS-DSCH control signal information.

First, it is transmitted through the same channel, that is, the HS-DSCH with user data.

Second, it is transmitted through a dedicated channel operating with the HS-DSCH.

Third, it is transmitted through a common channel operating with the HS-DSCH.

All 3GPP transport channels transmit data in accordance with a transmission time interval (TTI). All channels except the HS-DSCH have a TTI of 10, 20, 40, and 80 msec.

However, the HS-DSCH may be selected as one of 1, 3, 5, and 15 slots as an exception. In addition, the characteristics of the HS-DSCH is that the modulation scheme, the coding scheme, and additional information (redundancy version) for HARQ can be changed for each TTI.

However, in order to switch the transmission channel between the HS-DSCH and other transmission channels according to the size of data to be transmitted, channel reconfiguration must be performed under the control of the RRC. If the transmission channel switching occurs frequently, excessive control information or transmission delay may occur. have.

Therefore, it is desirable to propose a method of applying a dynamic transport channel switching function that can be implemented between a current downlink shared channel (DSCH) and a dedicated channel (DCH) to the HS-DSCH.

The present invention has been made to solve the above-mentioned problems, and proposes a method of enabling the HS-DSCH transport channel designed for HSDPA under the control of the MAC to enable dynamic transport channel switching with other transport channels.

In addition, the combinations and the respective switching examples for the dynamic transmission channel switching to be applicable to all the HS-DSCH control signal information transmission scheme.

1 is a block diagram of a 3GPP UMTS (asynchronous) system to which the prior art and the present invention are applied.

2 is a structure of a radio interface protocol according to the 3GPP radio access network standards

3 shows an example of a protocol hierarchy for each radio access network component according to 3GPP standards

4 is a structure of an RLC layer and a MAC layer of the UTRAN side

5 is a protocol structure based on the HSDPA technology expressed mainly on the interface

6 is a MAC model of UTRAN for conventional HSDPA.

7 is a MAC model of a UE for a conventional HSDPA

8 is a MAC model of UTRAN for HSDPA of the present invention

9 is a MAC model of the UE for HSDPA of the present invention

10 is a combination of downlink transport channels that can be simultaneously configured for HSDPA to one UE according to the present invention.

11 is a combination of uplink transport channels that one UE can simultaneously configure for HSDPA according to the present invention.

12 is a dynamic transport channel switching function of downlink channels according to the present invention

13 is a dynamic transport channel switching function of uplink channels according to the present invention

14 is a transmission procedure for HS-DCH and HS-DSCH of the present invention.

The dynamic transmission channel switching method by the MAC control of the HSDPA system according to the present invention is a mobile communication system which performs a high-speed data transmission by setting a switchable channel combination for a transmission channel by a radio resource control layer (RRC). And switching the transport channel by a medium access control layer (MAC) within the transport channel combination setting range.

In addition, in the present invention, the method for switching the transport channel may be such that one logical channel corresponds to a plurality of transport channels in a predetermined switchable transport channel combination.

In addition, in the present invention, the transmission channel switching by the control of the medium access control layer (MAC) is performed by the MAC-D sublayer, and the MAC-D sublayer is the amount of data to be transmitted from the upper layer or the fast downlink shared channel ( Transport channel switching is performed in consideration of the amount of data waiting to be transmitted through the HS-DSCH.

Also, in the present invention, the fast downlink shared channel control sublayer (MAC HS-DSCH) transmits information on the amount of data waiting to be transmitted through the measured downlink shared channel (HS-DSCH). ), And the radio resource control layer (RRC) transmits the information to the MAC-D sublayer.

In the present invention, the control of the MAC layer is performed by a fast downlink shared channel control layer (MAC HS-DSCH), the shared channel control sub-layer is waiting to be transmitted through the fast downlink shared channel (HS-DSCH) It is characterized by switching the transmission channel by measuring the amount of data.

Other objects and features of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

With reference to the accompanying drawings will be described a method of dynamic channel switching and control signal transmission by the MAC control according to the present invention.

First, the general content of the present invention will be briefly described.

According to the present invention, the HS-DSCH transport channel designed for HSDPA under the control of MAC enables dynamic transport channel switching with other transport channels.

In the present invention, a transport channel capable of switching between the HS-DSCH and the dynamic transport channel includes a conventional DCH, a DSCH, and a high speed shared channel associated dedicated channel (HS-DCH).

Apart from the above functions, it is possible to change the transport channel from HS-DSCH to FACH, DCH, DSCH, or vice versa under the control of RRC, and both the dynamic transport channel switching function and the transport channel switching function transmit MAC-D. It is performed in the channel switching block.

In the present invention, a physical channel to which the HS-DSCH is mapped is referred to as a high speed physical downlink shared channel (HS-PDSCH). In addition, the dedicated channel mentioned in the second method of transmitting control signal information of the HS-DSCH in the prior art is referred to as HS-DCH for convenience.

In the present invention, the HS-DCH is a bidirectional transport channel used to transmit control signals related to the transport channel generated in the MAC-HS-DSCH. Control signals transmitted on the HS-DCH are completed in the MAC HS-DSCH layer. An important difference between the HS-DCH and the existing DCH is the TTI. The TTI of the HS-DCH may be selected from one of 1, 3, 5, and 15 slots in the same manner as the TTI for the HS-DSCH.

The HS-DCH of the present invention is mapped to the physical channel HS-DPCH and transmitted over the air. HS-DCH is used for similar purposes as conventional DCH except for the above-mentioned features. That is, both voice and real-time and non-real-time data can be transmitted to the HS-DCH.

In another embodiment, the DCH may function as the HS-DCH. That is, the control signal related to the HS-DSCH may be transmitted through the existing DCH.

However, the dynamic transmission channel switching function of the HS-DSCH of the present invention operates regardless of which control information transmission scheme is applied to the system. That is, the present invention can be applied to both the control information transmission method through the HS-DCH or DCH and the aforementioned three conventional control information transmission methods.

8 is a UTRAN MAC model for HSDPA of the present invention.

The transport channel HS-DCH according to the present invention has been added to the MAC-D, and the dynamic dedicated channel switching function of the HS-DSCH of the present invention is implemented in the MAC-D.

9 is a UE MAC model for HSDPA of the present invention.

The transport channel HS-DCH according to the present invention has been added to the MAC-D, and the dynamic dedicated channel switching function of the HS-DSCH of the present invention is implemented in the MAC-D.

Hereinafter, a dynamic transport channel switching method by MAC control of the HS-DSCH according to the present invention will be described.

The dynamic transport channel switching method using the MAC control of the present invention is based on the premise that HS-DSCH, HS-DCH, and other DCH and DSCH are set by RRC control. In other words, RRC is one of the combinations of FIG. 10 for downlink channel and FIG. 11 for uplink channel according to RB configuration or reconfiguration, transport channel configuration and reconfiguration, and physical channel configuration and reconfiguration. Sets a transport channel combination for the UE.

The MAC performs a dynamic transport channel function for HSDPA after the initial operation. The dynamic transport channel switching scheme of the present invention assumes that one or more logical channels are mapped to all transport channels or some transport channels in each combination of FIGS. 10 and 11.

As described above, dynamic transport channel switching is performed in MAC-D. MAC-D performs dynamic transport channel switching in consideration of the amount of data to be transmitted in the upper layer, the amount of data waiting to be transmitted in the MAC-HS-DSCH, or the amount of data in the upper layer and the MAC-HS-DSCH. .

For example, when the amount of data of a logical channel currently being transmitted on a DSCH increases, the MAC converts the logical channel into an HS-DSCH to transmit data. This switching scheme is possible between DCH, DSCH, HS-DSCH, HS-DCH, and each channel. Examples of a switchable example include switching between downlink transmission channels in FIG. 12 and an example of switching between uplink transmission channels.

However, not all switching of Figs. 12 and 13 above is possible at all times, but only between transport channels preset by RRC.

For example, when the RRC is set to the seventh combination of FIG. 10, all the switching examples of FIG. 12 are possible. However, when the fourth downlink combination of FIG. 10 is set, the four, five, seven, eight, Only 10 and 11 dynamic transport channel switching is possible.

Dynamic transmission channel switching of uplink transmission channels is also the same as in the case of downlink. However, since only the downlink DSCH and the HS-DSCH are possible, only switching between the DCH and the HS-DCH is possible.

Hereinafter, a control signal information transmission method of the HS-DSCH, which is the second object of the present invention, will be described.

The combinations and respective switching examples of FIGS. 10, 11, 12, and 13 are applicable to all the above-described HS-DSCH control signal information transmission schemes.

That is, all embodiments of the dynamic transport channel switching function are possible in all HS-DSCH control signal information transmission schemes.

According to the present invention, the MAC HS-DSCH measures the amount of data waiting to be transmitted through the downlink transport channel HS-DSCH and reports the result directly to the MAC-D.

In another embodiment, the MAC HS-DSCH may measure the amount of data waiting to be transmitted through the downlink transport channel HS-DSCH and report it to the RRC, and the RRC may inform the MAC-D again.

More specifically, the MAC HS-DSCH measures and reports the traffic occupancy of the Node B MAC buffer waiting to be transmitted. The method of reporting the amount of data or the traffic share of the buffer to the MAC-D or RRC is a method of regularly reporting the measurement result and a method of reporting only when the measurement result value is greater than or equal to the preset reference value (s) or less than the reference value (s). There is a method of mixing the two methods. The measurement result reporting period, the reference value (s) to be compared with the measurement result, and the reporting method are preset by the RRC.

The measurements can be reported as measured data or by calculating an average or standard deviation. Data reported from MAC-HS-DSCH to MAC-D or RRC is transmitted through Iub interface, an interface standard between Node B and RNC, so it is transmitted through control of NBAP (Node B Application Part) or transmitted through Control Frame. do.

FIG. 14 shows that data 1 and data 2 transmitted at different times through a logical channel in RLC are MAC, data 1 is HS-DCH, and data 2 is HS-DSCH according to the present invention. An example is sent to.

In FIG. 14, one logical channel is mapped to two transport channels HS-DCH and HS-DSCH under the control of RRC.

The example of FIG. 14 shows an example of switching the number 1 transport channel of FIGS. 10 and 11 and switching the number 7 dynamic transport channel of FIG. 12.

In FIG. 14, an arrow indicates a name of a primitive for transmitting information between layers, and an arrow indicates a parameter included in the primitive.

14 illustrates a successful HS-DSCH data transmission scheme when the HS-DCH, which is a channel of data 1, transmits control signal information of the HS-DSCH, which is a channel of data 2. FIG.

Data2 transmitted through DTCH or DCCH in RLC of SRNC (relevant RNC) is transferred to MAC-HS-DSCH of Node B which is a physical channel through MAC-D and MAC-C / SH.

Subsequently, the MAC HS-DSCH performs scheduling for HS-DSCH data transmission, and transmits data 2 and a transport format indicator (TFI) value, which is control signal information of the corresponding HS-DSCH, and TFI 2 to L 1 of the Node B. do. At this time, TFI2 informs L1 of the transport block size, transport block set size, modulation and coding scheme of the HS-DSCH channel, for a specific UE during the transmission of the corresponding data. .

Along with the primitives transmitted from the MAC-HS-DSCH to the L1, the MAC-D of the SRNC is also the control signal information for the data 1 transmitted to the HS-DCH of the UE and the data 1 transmitted to the HS-DCH. Send TFI1 to L1 of Node B.

At this time, TFI1 includes transport block size and transport block set size information. If the modulation and coding scheme of the HS-DCH changes per TTI or frame, information on the modulation and coding scheme is also transmitted through TFI1. The TFI1 and TFI2 are combined at L1 and transmitted to the corresponding UE through a physical channel (HS-DPCH) to which the HS-DCH is mapped.

As described above, since the HS-DCH transmits control signal information (TF1 and TF2) of the HS-DSCH, the UE receiving TFI1 and TFI2 information from the HS-DCH decodes the HS-DCH data1 using the TFI1 information. Decode HS-DSCH data 2 using TFI2 information.

At this time, the received data 2 is checked for a reception error and is transmitted to the MAC-HS-DSCH of the UE with the result. Thereafter, the UE MAC-HS-DSCH requests L1 to transmit HARQ control information for data 2 through a primitive. If data 2 is received without error, HARQ control information (ACK) indicating that data 2 is correctly received is transmitted.

If an error occurs in data 2, HARQ control information (NACK), which means that an error occurs in data 2, is transmitted.

The HARQ control information (ACK or NACK) is transmitted to the corresponding Node B through the uplink HS-DCH channel along with other HS-DSCH-related control signal information and transmitted to the MAC-HS-DSCH. B retransmits data 2 stored in the MAC-HS-DSCH buffer through the HS-DSCH.

The same applies to the HS-DSCH data transmission when the DCH is used for the HS-DSCH control signal information transmission instead of the HS-DCH. In this case, the HS-DCH becomes a DCH and the HS-DPCH is a DPCH. The only difference is that

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments.

Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the dynamic channel switching and control signal transmission method according to the MAC control according to the present invention, when switching the transmission channel between the HS-DSCH and another transmission channel according to the size of the data to be transmitted, without the control of RRC In addition, since only MAC control is possible, additional control information and transmission delay can be minimized.

Claims (5)

In a mobile communication system for setting a switchable transport channel combination for a transport channel by a radio resource control layer (RRC) to perform high-speed data transmission, a medium access control layer (MAC) within the transport channel combination setting range is performed. A method of switching a transport channel under control of a MAC, characterized in that switching of transport channels is performed. The medium access control layer (MAC) according to claim 1, wherein the transport channel switching method allows one logical channel to correspond to a plurality of transport channels in a predetermined switchable transport channel combination. Transport channel switching method under the control of the < RTI ID = 0.0 > 2. The method of claim 1, wherein the transmission channel switching under the control of the MAC is performed by a MAC-D sublayer, and the MAC-D sublayer shares the amount of data to be transmitted from a higher layer or a fast downlink. A transport channel switching method under the control of a MAC, characterized in that the transport channel switching is performed in consideration of the amount of pending data to be transmitted through the channel (HS-DSCH). 4. The radio resource control layer of claim 3, wherein the fast downlink shared channel control sublayer (MAC HS-DSCH) provides information on the amount of data waiting to be transmitted through the measured downlink shared channel (HS-DSCH). Reporting to the RRC, wherein the RRC transfers the information to the MAC-D sublayer, and then changes the transport channel under the control of the MAC. Way. The method of claim 1, wherein the MAC layer is controlled by a fast downlink shared channel control layer (MAC HS-DSCH), and the shared channel control sublayer is to be transmitted through a fast downlink shared channel (HS-DSCH). A method of switching a transport channel by controlling a medium access control layer (MAC), characterized in that the transport channel is switched by measuring the amount of waiting data.