KR100862642B1 - Method for providing broadcast or multicast service - Google Patents

Abstract

The present invention provides a broadcast or multicast service, and in particular, provides a control channel that can be commonly used by a plurality of terminal groups that receive a broadcast or multicast service. In particular, the present invention relates to a technique for improving the efficiency of MBMS data transmission in UMTS, a European IMT-2000 system. The wireless mobile communication system according to the present invention includes a downlink shared data physical channel supporting at least one multicast service for a plurality of terminals; It uses a channel code different from the downlink shared data physical channel and has a channel structure including a downlink shared control physical channel for multicasting the control information of the multicast service to a plurality of terminals. In another embodiment of the present invention, a method for providing a broadcast or multicast service may include: a second downlink shared physics such that at least one terminal may receive the broadcast or multicast service data transmitted through a first downlink shared physical channel; Transmitting control information through a channel; And transmitting the data through the first downlink physical channel, wherein the second downlink physical channel includes at least one of a Transport Format Combination Indicator (TFCI) field and a Pilot field. It is configured to include.

Description

How to provide a broadcast or multicast service {METHOD FOR PROVIDING BROADCAST OR MULTICAST SERVICE}

1 is a block diagram showing a configuration example of a general UMTS network.

2 is a structural diagram of a radio access interface protocol between a terminal and a UTRAN based on the 3GPP radio access network standard;

3 is an explanatory diagram of a channel coding scheme of TFCI transmitted on a corresponding DPCH.

4 is a radio frame format diagram of a downlink shared data physical channel according to the present invention;

5 is a radio frame format diagram of a downlink shared control physical channel applied to the present invention.

6 is an explanatory diagram showing a time interval between a downlink shared control physical channel and a downlink shared data physical channel corresponding to the present invention;

7 is a signal flow diagram illustrating a transmission and reception relationship between a downlink shared control physical channel and a downlink shared data physical channel of the present invention.

8 is a signal flow diagram illustrating another transmission / reception relationship between a downlink shared control physical channel and a downlink shared data physical channel of the present invention.

*** Description of the symbols for the main parts of the drawings ***

100: UTRAN 110,120: wireless network system

111: wireless network controller 112,113: Node B                 

200: core network 210: MSC

220: GMSC 230: SGSN

240: GGSN

The present invention relates to a communication system, and more particularly to a method for providing a broadcast or multicast service. The present invention also relates to a wireless mobile communication system providing a control channel that can be commonly used by a plurality of terminal groups receiving a multicast service. In particular, the present invention relates to a technology for providing a wireless multimedia broadcasting or multicast service in UMTS, a European IMT-2000 system, and particularly, a channel code of a wireless communication system adapted to a wireless access network that broadcasts or multicasts using a variable code channel. It relates to a control information communication method.

UMTS (Universal Mobile Telecommunications System) is a third generation mobile communication system that has evolved from the European standard Global System for Mobile Communications (GSM) system.The GSM Core Network and the WCDMA Wideband Code Division Multiple Access (WCDMA) It aims to provide better mobile communication service based on wireless access technology.

For the standardization of UMTS, in December 1998, ETSI in Europe, ARIB / TTC in Japan, T1 in the US and TTA in Korea were referred to as the Third Generation Partnership Project (hereinafter abbreviated as "3GPP"). Has been working on a detailed specification of UMTS.

In 3GPP, UMTS standardization work is referred to as 5 Technical Specification Groups (hereinafter, abbreviated as "TSG") in consideration of the independence of network components and their operation for rapid and efficient technology development of UMTS. Divided into proceeds.

Each TSG is responsible for the development, approval, and management of standards within the relevant areas, among which the Radio Access Network (hereinafter referred to as "RAN") group (TSG RAN) uses WCDMA access technology in UMTS. Develop specifications for the functions, requirements, and interfaces of the UMTS radio network (Universal Mobile Terrestrial Radio Access Network, hereinafter abbreviated as "UTRAN"), a new radio access network to support.

FIG. 1 illustrates a configuration of a general UMTS network. As shown in FIG. 1, a UMTS system includes a user equipment (UE) (hereinafter abbreviated as “terminal”), a UTRAN 100, and a core network 200.

The UTRAN 100 is composed of one or more Radio Network Sub-systems (RNS) 110, 120, which are again referred to as a Radio Network Controller (hereinafter, referred to as "RNC") ( 111 and one or more Node Bs 112, 113 managed by the radio network controller 111.

The Node Bs 112 and 113 are managed by the radio network controller 111. The Node Bs 112 and 113 are managed by the radio network controller 111. The Node Bs 112 and 113 receive information sent from the physical layer of the UE in the uplink and transmit data to the UE in the downlink. It serves as an access point of the UTRAN 100. The RNC 111 is responsible for allocating and managing radio resources and serves as an access point with the core network 200.

The core network 200 includes a mobile switching center (MSC) 210 to support a circuit switched service, a gateway mobile switching center (GMSC) 220, and an SGSN to support a packet switched service. Serving GPRS Support Node (230) and GGSN (GGSN: Gateway GPRS Support Node) 240 are provided and configured.

The main function of the UTRAN 100 may be to configure and maintain a radio access bearer (hereinafter, abbreviated as "RAB") for a call between the terminal and the core network 200. In addition, the core network 200 applies an end-to-end quality of service (hereinafter, abbreviated as "QoS") requirement to the RAB, and the RAB is set by the core network 200. It supports one QoS requirement. Thus, the UTRAN 100 can meet end-to-end QoS requirements by configuring and maintaining RABs. The RAB service may be further divided into a ui bearer service and a radio bearer service. Here, the Iu carrier service is responsible for the reliable transmission of user data between the UTRAN 100 and the core network 200 boundary node, and the wireless carrier service is responsible for the reliable transmission of user data between the terminal and the UTRAN 100. .

The services provided to specific terminals are largely divided into circuit-switched services and packet-switched services. For example, general voice telephone services belong to circuit-switched services, and web browsing services through Internet access are classified as packet-switched services. First, in case of supporting circuit switched service, the RNC 111 is connected with the MSC 210 of the core network 200, and the MSC 210 is connected with the GMSC 220 managing the incoming or outgoing connection from another network. . For the packet switched service, the service is provided by the SGSN 230 and the GGSN 240 of the core network 200. The SGSN 230 supports packet communication destined for the RNC 111, and the GGSN 240 manages connection to another packet switching network such as the Internet network.

There is an interface (Interface) that can send and receive information for communication between the various network components, the interface between the RNC 111 and the core network 200 is defined as the Iu interface. When the Iu interface is connected to the packet switched area, it is defined as 'Iu-PS', and when it is connected to the circuit switched area, it is defined as 'Iu-CS'.

Hereinafter, a Radio Network Temporary Identifier (hereinafter, abbreviated as RNTI) will be described. The RNTI is used as identification information of the terminal while the connection is maintained between the terminal and the UTRAN. For this purpose, four RNTIs of S-RNTI, D-RNTI, C-RNTI, and U-RNTI are defined and used. Serving RNC RNTI (S-RNTI) is allocated by the Serving RNC (SRNC) when the connection between the UE and the UTRAN is established, and becomes information capable of identifying the UE in the SRNC. The D-RNTI (Drift RNC RNTI) is allocated by the DRNC (Drift RNC) when an RNC handover occurs due to the movement of the UE. C-RNTI (C-RNTI: Cell RNTI) is information for identifying a terminal in a CRNC (CRNC: Controlling RNC). When a terminal enters a new cell, a new C-RNTI value is received from the CRNC. Lastly, U-RNTI (U-RNTI: UTRAN RNTI) is composed of SRNC Identity and S-RNTI. Since the SRNC managing the terminal and the identification information of the terminal in the corresponding SRNC can be known, the absolute identification of the terminal It can be said to provide information. When transmitting data using the shared transport channel, the MAC-c / sh layer includes C-RNTI or U-RNTI in the header of the MAC PDU. At this time, the header of the MAC PDU also includes a UE ID Type Indicator (UE ID Type Indicator) indicating the type of RNTI included.

Figure 2 shows the structure of a radio access interface (Radio Access Interface) protocol between the terminal and the UTRAN based on the 3GPP radio access network standards. The wireless access interface protocol of FIG. 2 consists of a physical layer, a data link layer, and a network layer horizontally, and vertically, a control plane for transmitting a user plane and a signaling signal for transmitting data information. Control Plane). The user plane is an area in which traffic information of the user is transmitted, such as voice or IP packet transmission, and the control plane is an area in which control information is transmitted, such as network interface or call maintenance and management. The protocol layers of FIG. 2 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is well known in communication systems, and includes L1 (first layer), L2 (second layer), and L3 (first layer). Three layers).

Hereinafter, each layer of FIG. 2 will be described. The L1 layer provides an information transfer service to an upper layer using various wireless transmission technologies. The upper layer of the medium access control layer (Medium Access Control) is connected through a transport channel (Transport Channel), through which the data between the media access control layer and the physical layer moves.

Data transmitted through the transmission channel is transmitted according to a transmission time interval (hereinafter, abbreviated as TTI). On the other hand, the physical channel is divided into a predetermined unit of time called a frame (frame) to deliver data. Connection frame number (CFN) is used to synchronize the transport channel between the UE and the UTRAN. For the other transport channels except paging channel (PCH), the CFN ranges from 0 to 255. In other words, the CFN is repeatedly cycled at 256 frames. In addition to the CFN, a system frame number (hereinafter abbreviated as SFN) is used to synchronize the physical channels. The SFN value ranges from 0 to 4095 and is repeated every 4096 frames.

Medium Access Control (hereinafter referred to as MAC) provides a service for reassigning MAC parameters for allocating and reallocating radio resources. The upper layer is connected to a radio link control layer, which is 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 to transmit control plane information, and a traffic channel is used to transmit information of a user plane. The MAC may be classified into a MAC-b sublayer, a MAC-d sublayer, and a MAC-c / sh sublayer according to the type of a transport channel managed. The MAC-b sublayer is responsible for managing a BCH (Broadcast Channel), which is a transport channel for broadcasting system information. The MAC-c / sh sublayer manages a shared transport channel such as a forward access channel (FACH) or a downlink shared channel (DSCH) shared with other terminals. In UTRAN, the MAC-c / sh sublayer is located in the CRNC and manages channels shared by all terminals in a cell, so that there is one for each cell. In addition, there is one MAC-c / sh sublayer in each terminal. The MAC-d sublayer is responsible for managing a dedicated channel (DCH), which is a dedicated transport channel for a specific terminal. Therefore, the MAC-d sublayer of the UTRAN is located in the SRNC that manages the corresponding terminal, and there is one MAC-d sublayer in each terminal.

The Radio Link Control (hereinafter referred to as RLC) layer supports reliable data transmission, and splits and connects the RLC Service Data Unit (hereinafter referred to as SDU) from the upper layer. Segmentation and Concatenation) function can be performed. The RLC SDU delivered from the upper layer is sized to be suitable for 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). . In the RLC layer, there is an RLC buffer for storing RLC SDUs or RLC PDUs from above.

The Broadcast / Multicast Control layer (hereinafter abbreviated as BMC) layer schedules Cell Broadcast Message (abbreviated as CB message) delivered from the core network and is located in a specific cell (s). To perform a function of broadcasting to UEs. In terms of UTRAN, the CB message transmitted from the upper layer is transmitted to the RLC layer in the form of a BMC message by adding information such as a message ID, a serial number, a coding scheme, and a logical channel CTCH (CTCH: It is delivered to the MAC layer through the Common Traffic Channel. The logical channel CTCH is mapped to a transport channel forward access channel (FACH) and a physical channel secondary common control physical channel (S-CCPCH).

The Packet Data Convergence Protocol (hereinafter referred to as PDCP) layer is located above the RLC layer, and data transmitted through a network protocol such as IPv4 or IPv6 is efficiently transmitted over a relatively small bandwidth wireless interface. To be possible. To this end, the PDCP layer reduces the unnecessary control information used in the wired network. This function is called header compression and is defined by the Internet Standardization Group called the Internet Engineering Task Force (IETF). Compressor methods RFC2507 and RFC3095 (Robust Header Compression (ROHC)) can be used. These methods can transmit only necessary information in the header portion of the data, thereby transmitting less control information, thereby reducing the amount of data to be transmitted.

The radio resource control layer (hereinafter RRC) layer located at the bottom of L3 is defined only in the control plane and transmitted in connection with setting, resetting, and releasing radio bearers (hereinafter, RB). Responsible for controlling channels and physical channels. In this case, the RB refers to a service provided by the second layer for data transmission between the UE and the UTRAN. In general, the RB is configured to define characteristics of a protocol layer and a channel necessary to provide a specific service. The process of setting specific parameters and operation methods.

For reference, the RLC layer may belong to a user plane or a control plane according to a layer connected to an upper layer. A case belonging to the control plane corresponds to a case of receiving data from a radio resource control layer (hereinafter abbreviated as RRC) layer, and other cases correspond to a user plane.

In addition, as shown in FIG. 2, in the case of the RLC layer and the PDCP layer, several entities may exist in one layer. This is because one terminal has several radio carriers, and only one RLC entity and PDCP entity are generally used for one radio carrier.

Hereinafter, the DSCH channel will be described. Unlike the uplink, a code shortage problem occurs in the downlink. This is limited in the number of codes that a cell can have in one base station, and this is related to a spreading factor (hereinafter abbreviated as SF) so that the number of physical channels becomes small when the transmission rate is high. In addition, such a data service has a burst characteristic. Therefore, if one channel is continuously allocated, it is difficult to use the code efficiently. In order to solve this problem, a method of sharing one channel is used and code multiplexing is used to share one channel. Code assignment is performed every radio frame. That is, the channel code for the physical channel of the DSCH is changed every radio frame.

Physical downlink shared channel (PDSCH), which is a physical channel, is used to transmit a transport channel DSCH. One PDSCH channel corresponds to one channelization code. One PDSCH radio frame is assigned to only one specific UE. The radio network allocates different PDSCH channels to different UEs for each radio frame. One or more PDSCH channels having the same SF in a specific radio frame may be allocated to a specific UE. Each PDSCH channel operates in association with one downlink dedicated physical channel (DPCH) channel. This related DPCH is called associated DPCH. The PDSCH and the corresponding DPCH do not necessarily have the same SF. Since the PDSCH cannot transmit physical layer control information such as pilot, TFCI, and TPC, all physical layer control information related to the DSCH is transmitted through a downlink physical control channel (DPCCH), which is a control channel constituting a corresponding DPCH. The UE can decode the DSCH using the TFCI field 2 (hereinafter TFCI2) information transmitted on the corresponding DPCH. Macrodiversity is not applied to the DSCH and is transmitted only in one specific cell.

The channel coding scheme of the TFCI transmitted on the corresponding DPCH is shown in FIG. 3. In general, 10-bit information TFCI is encoded into 30-bit information through channel coding and transmitted through the TFCI field every radio frame. However, in the DPCH corresponding to the DSCH, the TFCI split mode channel coding scheme is used as shown in FIG. 3. Here, 5-bit TFCI information in the input terminal means first TFCI field and second TFCI field information, respectively. The first TFCI field indicates transport format combination information of a transport channel DCH mapped to a DPCH. On the other hand, the second TFCI field informs the transmission format combination information and the channel code information of the corresponding DSCH. Each 5-bit TFCI field information is encoded into two 16-bit TFCI code words through two different bi-orthogonal code encoders as shown here. Information encoded by two 16-bit TFCI codewords through channel coding is mixed together in one TFCI field constituting a radio frame.

Hereinafter, a multimedia broadcast / multicast service (hereinafter, abbreviated as MBMS) will be described in detail. MBMS is classified into broadcast mode and multicast mode. First, the MBMS broadcast mode is a service for transmitting multimedia data to all users in a broadcast area. In this case, the broadcasting area means an area where a broadcasting service is available, and a procedure for users to receive an arbitrary broadcasting service is as follows.

① Users receive a service announcement provided by the network. Here, the service guide refers to an act of notifying the terminal of a list of services to be provided and related information in the future.

② In the network, set a bearer for the broadcasting service.

③ Users receive service notifications provided by the network. Here, the service notification refers to an act of notifying the terminal of information on broadcast data to be transmitted.

④ Users receive broadcast data transmitted by the network.

⑤ The network terminates the carrier for the broadcast service.

MBMS multicast mode is a service that transmits multimedia data only to a specific user group in a multicast area. In this case, the multicast region refers to an area in which a multicast service is available. The procedure for users to receive any multicast service is as follows.

① The user must subscribe to the Multicast Subscription Group. In this case, subscription refers to the act of establishing a relationship between a service provider and a user. A multicast subscription group is a group of users who have completed the subscription process.

② Users who have subscribed to the multicast subscription group receive the service announcement provided by the network. Here, the service guide refers to an act of notifying the terminal of a list of services to be provided and related information in the future.

③ A user who joins a multicast subscription group joins a multicast group to receive a specific multicast service. In this case, the multicast group refers to a group of users who receive a specific multicast service. Participation refers to the act of joining a multicast group gathered to receive a specific multicast service. Participation is another term called MBMS Multicast Activation. The MBMS multicast activation or participation process allows a user to receive specific multicast data.

(4) The network sets up a carrier for the multicast service.

⑤ A user who participates in a multicast group receives a service notification provided by a network. Here, the service notification refers to an act of notifying the terminal of information about multicast data to be transmitted.                         

⑥ Users receive multicast data transmitted by the network.

7. The network terminates the carrier for the multicast service.

MBMS user data is transmitted from the RNC to the terminal through the base station using the service of the user plane of the UTRAN protocol. MBMS RB, which is an RB for MBMS, transmits user data of one specific MBMS service delivered to UTRAN from a core network to a specific UE group. MBMS RB can be largely divided into point to multipoint and point to point. UTRAN uses one of these two types of MBMS RBs to provide MBMS services. To select an MBMS RB, the UTRAN first determines the number of users of a particular MBMS service present in one cell. The UTRAN sets a threshold internally. If the number of users in the cell is smaller than the threshold, the point-to-point MBMS RB is set. If the number of users in the cell is larger than the threshold, the UTRAN sets the point-to-point MBMS RB.

In the conventional technology of providing an MBMS service using a shared transport channel, the biggest problem in providing various MBMS services in one cell is that the transmission power required for one MBMS service is large in the amount of power used by the base station. Will take part. Therefore, the first consideration in providing the MBMS service in the UTRAN is to minimize the transmission power required for the MBMS service to maximize the number of services provided by the base station. When providing a point-to-multipoint MBMS RB through conventional techniques, shared transport channels such as FACH and DSCH may be used. However, these shared transport channels have the following problems that can not effectively provide MBMS service in terms of transmission power.

First, a problem that occurs when providing an MBMS service through the FACH will be described. In the prior art, the FACH channel cannot frequently convert the downlink channel code determined once. That is, since the spreading factor cannot be changed, when the amount of data changes from time to time, discontinuous transmission (DTX) that does not transmit data for a specific time is performed. Such discontinuous transmission can be easily applied when the amount of data changes from time to time, but has the disadvantage of increasing the amount of power required when transmitting data.

Next, a description will be given of a problem that occurs when the MBMS service is provided through the DSCH. In the prior art, the DSCH channel must have a corresponding DPCH set for power control and control information transmission. If the DSCH channel is transmitted to a plurality of UEs, a problem arises in that a plurality of corresponding DPCHs must be set in order to provide one MBMS service. Given the amount of power required to transmit multiple corresponding DPCHs, providing MBMS services in the same way as DSCH is inefficient.

Accordingly, an object of the present invention is to provide a downlink shared data physical channel using a variable spreading scheme instead of using a discontinuous transmission scheme, and to transmit control information of the downlink shared data physical channel. It is to provide a broadcast or multicast service to improve the efficiency of MBMS data transmission by using a control physical channel.

The wireless mobile communication system according to the present invention includes a downlink shared data physical channel supporting at least one multicast service for a plurality of terminals; It uses a channel code different from the downlink shared data physical channel and has a channel structure including a downlink shared control physical channel for multicasting the control information of the multicast service to a plurality of terminals.

The downlink shared control physical channel broadcasts or multicasts different control periods for different broadcast or multicast services for different time intervals, and the control information is assigned to a specific terminal or group of terminals. This is to indicate whether a time period should be received. The control information is information such as the number of channel codes or the number of spreading factor channel codes of the downlink shared data physical channel. The control information transmitted during one section of the downlink shared control physical channel is control information used in one section of the downlink shared data physical channel, and the two sections have a predetermined time difference. In general, the time period between the downlink shared data physical channel and the downlink shared control physical channel may be one radio frame. A specific field such as a TFCI field may be used among corresponding radio frames of the downlink shared control physical channel.
Method for providing a broadcast or multicast service according to the present invention,
In the method for providing a broadcast or multicast service,
Transmitting control information through a second downlink physical channel so that at least one terminal can receive the broadcast or multicast service data transmitted through a first downlink physical channel; And
And transmitting the data through the first downlink physical channel, wherein the second downlink physical channel includes at least one of a transport format combination indicator (TFCI) field and a pilot field. And the second downlink shared physical channel further includes data of a service different from the data transmitted through the first downlink shared physical channel.
Preferably, the control information of the second downlink physical channel, characterized in that it comprises at least one of the receiver indicator field and the channel code field.
In addition, the method for providing a broadcast or multicast service according to the present invention,
Transmitting control information through a second downlink physical channel so that at least one terminal can receive the broadcast or multicast service data transmitted through a first downlink physical channel; And transmitting the data through the first downlink physical channel, wherein the second downlink physical channel includes at least one of a Transport Format Combination Indicator (TFCI) field and a Pilot field. It is configured to include.
Preferably, the first downlink shared physical channel is mapped to a downlink shared transport channel.
Preferably, the first downlink shared physical channel is a downlink shared data physical channel.
Preferably, the second downlink shared physical channel is a downlink shared control physical channel.
Preferably, the data transmitted on the first downlink physical channel is characterized in that a plurality of codes are used.
Preferably, the second downlink physical channel is characterized by transmitting data of a service different from the data transmitted by the first downlink shared physical channel.
Preferably, the second downlink physical channel further comprises a receiver indicator field and a channel code field.
Preferably, the downlink shared transport channel is characterized in that the Forward Access Channel (FACH) or Downlink Shared Channel (DSCH).
Preferably, the first downlink physical channel and the second downlink physical channel are characterized by using different codes.

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In addition, the method for receiving a broadcast or multicast service according to the present invention,
In the method for providing a broadcast or multicast service,
Receiving control information via a second downlink physical channel to receive the broadcast or multicast service data received through a first downlink physical channel from a network; And
And receiving the data through the first downlink physical channel, wherein the second downlink physical channel comprises at least one of a transport format combination indicator (TFCI) field and a pilot field. And the second downlink physical channel further includes data of a service different from the data received through the first downlink physical channel.
Preferably, the control information of the second downlink physical channel, characterized in that it comprises at least one of the receiver indicator field and the channel code field.
In addition, the method for receiving a broadcast or multicast service according to the present invention,
Receiving control information via a second downlink physical channel to receive the broadcast or multicast service data received through a first downlink physical channel from a network; And receiving the data through the first downlink physical channel, wherein the second downlink physical channel includes at least one of a Transport Format Combination Indicator (TFCI) field and a Pilot field. It is configured to include.
Preferably, the first downlink shared physical channel is mapped to a downlink shared transport channel.
Preferably, the first downlink shared physical channel is a downlink shared data physical channel.
Preferably, the second downlink shared physical channel is a downlink shared control physical channel.
Preferably, the data received on the first downlink physical channel is characterized in that a plurality of codes are used.
Preferably, the second downlink physical channel is characterized by receiving data of a service different from the data transmitted by the first downlink physical channel.
Preferably, the second downlink physical channel further comprises a receiver indicator field and a channel code field.
Preferably, the downlink shared transport channel is characterized in that the Forward Access Channel (FACH) or Downlink Shared Channel (DSCH).
Preferably, the first downlink physical channel and the second downlink physical channel are characterized by using different codes.
When described in detail with reference to Figure 4 to 8 attached to the present invention as follows.

According to the present invention, in a wireless system that broadcasts or multicasts a plurality of services through a downlink shared data physical channel that can be received by a plurality of terminals, the wireless system varies control information of the downlink shared data physical channel at a predetermined time period. The data is transmitted, and the variable control information is transmitted at a predetermined time period through the downlink shared control physical channel using a different code from the downlink shared data physical channel.

Herein, the variable control information refers to channel code information of the downlink shared data physical channel or information indicating whether a specific time period of the downlink shared data physical channel should be received to a specific terminal or a terminal group. The channel code information of the downlink shared data physical channel means the number of channel codes, SF of channel codes, and the number of channel codes used for multi-code transmission.                     

In the downlink shared data physical channel of the present invention, specific MBMS service control information is transmitted during a specific radio frame. In addition, different radio frames allow different MBMS services to be transmitted. In other words, a specific radio frame of the downlink shared data physical channel is a time interval received by a specific terminal group to receive the MBMS service transmitted in the radio frame. The downlink shared data physical channel is mapped to a downlink shared data transport channel such as a FACH or a DSCH.

In the present invention, the downlink shared control physical channel performs a function of transmitting control information required when a plurality of terminals receive data transmitted through the downlink shared data physical channel. That is, in order for a specific terminal group to receive data of a specific MBMS service transmitted during a specific radio frame of the downlink shared data physical channel, control information is transmitted during a specific radio frame of the downlink shared control physical channel. The downlink shared control physical channel transmits control information necessary for receiving data of different MBMS services during different radio frames. Accordingly, the downlink shared control physical channel transmits control information for data reception of one or more MBMS services. The UTRAN operates a specific downlink shared data physical channel and a specific downlink shared control physical channel corresponding thereto. A terminal group that receives data of a specific MBMS service receives a specific downlink shared data physical channel and a specific downlink shared control physical channel having a corresponding relationship.

Hereinafter, the structure of the two physical channels will be described in detail. 4 shows a structure of a downlink shared data physical channel of the present invention. The downlink shared data physical channel is a physical channel for transmitting data of one or more MBMS services in a downward direction and is a channel created for simultaneous reception by one or more terminals. The downlink shared data physical channel may transmit data of different MBMS services by dividing the data at predetermined time periods. Here, the predetermined time period is called a radio frame, and one radio frame includes one or more slots as shown in FIG. 4. The length of the slot is always constant, and one radio frame consists of Nd slots. One slot consists of one field for transmitting data. The downlink shared data physical channel may be transmitted using one channel code, but may be transmitted using two or more channel codes simultaneously. This transmission method using two or more channel codes simultaneously is called a multi-code transmission method. Multi-code transmission is a transmission method applied when a high speed data is to be transmitted using multiple codes.

5 shows an example of the structure of a downlink shared control physical channel of the present invention. The downlink shared control physical channel is a channel created so that one or more terminals can simultaneously receive the downlink shared data physical channel control information. The downlink shared control physical channel can transmit variable control information by dividing it at a predetermined time period. That is, the downlink shared control physical channel may be transmitted while updating control information by dividing the control channel by a predetermined time period. Here, the predetermined time period is called a radio frame. Therefore, the control information can be transmitted by changing the information for each radio frame. One radio frame consists of one or more slots. The length of the slot is always constant, and one radio frame consists of Ns slots. In the downlink shared control physical channel, one slot includes one or more fields. One slot transmits one or more pieces of information and includes the information in one or more fields. The information and fields transmitted by each slot of the downlink shared control physical channel are described in detail as follows.

First, each slot may include a field containing receiver indicator information indicating whether the UE should receive a specific radio frame of the downlink shared data physical channel. Second, each slot may include a field containing channel code information (number of channel codes, SF information of channel codes, number of channel codes used for multicode transmission) used during a specific radio frame of a downlink shared data physical channel. have. Third, each slot may include a field containing pilot information for estimating a radio channel situation at a receiving side. Fourth, each slot may include a data field for transmitting a service different from the service data transmitted by the downlink shared data physical channel. The data that can be transmitted by the downlink shared control physical channel may be service data transmitted by the transport channel FACH and the transport channel RACH in the prior art. In addition, the configuration information of the downlink shared data physical channel may be transmitted to the data field of the downlink shared control physical channel. That is, the terminal first receives the configuration information of the downlink shared data physical channel transmitted by the data field of the downlink shared control physical channel, and then configures to receive the downlink shared data physical channel using the configuration information. Fifth, each slot may include a transport format combination indicator (TFCI) field. This field contains information on the number and size of data transport blocks transmitted in the data field of the downlink shared control physical channel.

Each slot of the downlink shared control physical channel includes all of the fields or only some of the fields. In addition, some of the information of the field may be transmitted in one field. If there is more than one field transmitted in the slot, the order of transmission is predetermined before the radio network design. The schemes A-E shown in Figs. 5A to 5E show examples of some possible structures. In scheme A, it consists of one slot including all five fields mentioned above. On the other hand, like the method B, the receiver indicator field and the channel code field may be transmitted together through one control information field. That is, each slot includes one field for transmitting control information of the downlink shared data physical channel. In addition, like the scheme C, the control information may be transmitted in the same field as the TFCI information. In other words, the receiver indicator information and the channel code information may be transmitted in one field together with the TFCI information. Thus, the structure of scheme C is the same as the conventional SCCPCH physical channel structure. In addition, like the method D and the method E, the receiver indicator information or the channel code information may be transmitted together with the TFCI information in one field. In this case, channel code information or destination indicator information not transmitted together with the TFCI information may be transmitted in an independent field.

6 illustrates a time relationship between a downlink shared control physical channel and a downlink shared data physical channel. The specific radio frame of the downlink shared control physical channel transmits control information for the specific radio frame of the downlink shared data physical channel. That is, the specific radio frame of the downlink shared control physical channel corresponds to the specific radio frame of the downlink shared data physical channel. The transmitting side transmits the radio frames in these correspondences at predetermined time intervals. In other words, the transmitting side causes a gap between the transmission start point of a specific radio frame of the downlink shared control physical channel and the transmission start point of a specific radio frame of the downlink shared data physical channel for a time equal to Tsd. Therefore, the radio frame of the downlink shared control physical channel is always transmitted by Tsd before the radio frame of the corresponding downlink shared data physical channel at the transmitter. The receiving side also receives the radio frame of the downlink shared control physical channel first, and then receives the radio frame of the downlink shared data physical channel corresponding to the Tsd time. The Tsd value is determined by the RNC when the downlink shared control physical channel and the downlink shared data physical channel are configured. The RNC delivers the Tsd value determined at the time of channel establishment to the base station and the terminal. In the case of the terminal, the RRC layer of the RNC first transmits a Tsd value to the RRC layer of the terminal, and then transfers the Tsd value received by the terminal RRC layer to the physical layer of the terminal. The terminal may determine a correspondence relationship between the radio frame of the downlink shared control physical channel and the radio frame of the downlink shared data physical channel through the Tsd value. That is, the terminal determines that the radio frame of the downlink shared control physical channel and the radio frame of the downlink shared data physical channel differ by as much as Tsd.

When the TFCI field transmits two or more pieces of information, such as schemes C, D, and E of FIG. 5, the channel coding scheme of the TFCI split mode mentioned in the prior art may be used. That is, the two pieces of information included in the TFCI field use different quadrature encoders. In other words, in the scheme C, the TFCI information and the control information are channel coded through different quadrature encoders. In addition, in the scheme D, the TFCI information and the destination indicator information are channel coded by using different quadrature encoders. In addition, in the method E, the TFCI information and the channel code information are channel coded by using different quadrature encoders.

7 illustrates an example of a process of transmitting and receiving a downlink shared control physical channel and a downlink shared data physical channel according to the present invention. Here, a case in which the downlink shared control physical channel transmits the channel code information and the receiver indicator information of the downlink shared data physical channel in both fields or one field will be described. That is, the control information includes channel code information and destination indicator information of the downlink shared data physical channel. Here, the terminal group means one or more terminals receiving specific MBMS service data through the downlink shared data physical channel. Transmission from the UTRAN to a terminal group means broadcasting or multicast.

① The physical layer of the terminal transmits control information of the downlink shared data physical channel through a radio frame of the downlink shared control physical channel. The terminal transmits control information of the downlink shared data physical channel every radio frame. If the reception indicator of the control information instructs to receive the radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal performs the following process. If the reception indicator of the control information does not instruct to receive the radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal receives the control information of the next radio frame without performing the following process.

② When the reception indicator of the control information instructs to receive a radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal uses the channel code information of the received control information to transmit the radio of the downlink shared control physical channel. Receives radio frame data of a downlink shared data physical channel corresponding to a frame.

8 illustrates another example of a process of transmitting and receiving a downlink shared control physical channel and a downlink shared data physical channel according to the present invention. Here, the downlink shared control physical channel includes a data field, and the data field will be described for transmitting configuration information of the downlink shared data physical channel. Here, the terminal group means one or more terminals receiving specific MBMS service data through the downlink shared data physical channel. Transmission from the UTRAN to a terminal group means broadcasting or multicast.

① The RRC layer of UTRAN transmits downlink shared data physical channel configuration information to the terminal RRC layer through a lower layer service. At this time, the data field of the downlink shared control physical channel transmits the downlink shared data physical channel configuration information.

② The RRC layer of the terminal transmits the received downlink shared data physical channel configuration information to the lower layer of the terminal and sets to receive the downlink shared data physical channel.

③ The physical layer of the terminal receives the control information of the downlink shared data physical channel through a radio frame of the downlink shared control physical channel. The terminal receives control information of the downlink shared data physical channel every radio frame. If the reception indicator of the control information instructs to receive the radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal performs the following process. If the reception indicator of the control information does not instruct to receive the radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal receives the control information of the next radio frame without performing the following process.

④ When the reception indicator of the control information instructs to receive the radio frame of the corresponding downlink shared data physical channel, the physical layer of the terminal uses the channel code information of the received control information to transmit the radio of the downlink shared control physical channel. Receives data in a radio frame of a downlink shared data physical channel corresponding to the frame.

As described in detail above, in case of providing various MBMS services in one cell through FACH and DSCH channels in a conventional manner, MBMS because FACH uses discontinuous transmission and DSCH transmits control information through dedicated physical channel. The transmission power required for one service occupied a large part of the base station power. Therefore, the present invention proposes a downlink shared data physical channel using a variable spreading scheme instead of using a discontinuous transmission scheme, and transmits control information of the downlink shared data physical channel, and is not a downlink dedicated physical channel but a downlink shared control physical. By using the channel, there is an effect that the transmission efficiency of the MBMS data is improved.

Claims (39)

In the method for providing a broadcast or multicast service, Transmitting control information through a second downlink physical channel so that at least one terminal can receive the broadcast or multicast service data transmitted through a first downlink physical channel; And And transmitting the data through the first downlink physical channel, wherein the second downlink physical channel includes at least one of a transport format combination indicator (TFCI) field and a pilot field. And the second downlink shared physical channel further comprises data of a service different from the data transmitted through the first downlink shared physical channel. The method of claim 1, wherein the first downlink shared physical channel is mapped to a downlink shared transport channel. The method of claim 1, wherein the first downlink shared physical channel is a downlink shared data physical channel. The method of claim 1, wherein the second downlink shared physical channel is a downlink shared control physical channel. The method of claim 1, wherein a plurality of codes are used for the data transmitted on the first downlink physical channel. The method of claim 1, wherein the control information of the second downlink physical channel is And at least one of a destination indicator field and a channel code field. The method of claim 1, wherein the second downlink physical channel further comprises a receiver indicator field and a channel code field. The method of claim 2, wherein the downlink shared transport channel is a forward access channel (FACH) or a downlink shared channel (DSCH). The method of claim 1, wherein the first downlink physical channel and the second downlink physical channel use different codes. Receiving control information via a second downlink physical channel to receive the broadcast or multicast service data received through a first downlink physical channel from a network; And And receiving the data through the first downlink physical channel, wherein the second downlink physical channel comprises at least one of a transport format combination indicator (TFCI) field and a pilot field. And the second downlink physical channel further comprises data of a service different from the data received through the first downlink physical channel. 12. The method of claim 10, wherein the first downlink shared physical channel is mapped to a downlink shared transport channel. 12. The method of claim 10, wherein the first downlink shared physical channel is a downlink shared data physical channel. The method of claim 10, wherein the second downlink shared physical channel is a downlink shared control physical channel. 12. The method of claim 10, wherein a plurality of codes are used for the data received through the first downlink physical channel. The method of claim 10, wherein the control information of the second downlink physical channel is A method for receiving a broadcast or multicast service, characterized in that it comprises at least one of a receiver indicator field and a channel code field. 12. The method of claim 10, wherein the second downlink shared physical channel further comprises a receiver indicator field and a channel code field. 12. The method of claim 11, wherein the downlink shared transport channel is a forward access channel (FACH) or a downlink shared channel (DSCH). 12. The method of claim 10, wherein the first downlink physical channel and the second downlink physical channel use different codes. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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