KR20080097920A - Uplink access method for receiving a broadcast and multicast service - Google Patents

Abstract

An uplink access method for receiving a broadcast and multicast service is provided to prevent a message from being transmitted upward in case there is no a terminal ID. A method for receiving the point-to-multipoint service on a wireless communication system includes the following steps. Access information message for the point to multipoint service is received. A random access preamble is transmitted after the access information message is received. A random access response is received to the response to the random access preamble. According to the information included in the received random access response, it is determined whether to transmit a response message to the random access or not.

Description

Uplink access method for receiving a broadcast and multicast service}

The present invention relates to a wireless terminal for receiving a broadcast service. In order to use a radio resource more efficiently, a terminal receiving a response request message transmits an uplink preamble according to the information of the response request message, and responds to the uplink preamble. Receives, if the response message includes a terminal identifier with the identifier of the preamble upwards and transmits the message, and if the identifier of the preamble in the response message but there is no terminal identifier upwards to not transmit the message upward It relates to a connection method.

1 is a diagram illustrating a network structure of an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) which is a mobile communication system to which the present invention and the present invention are applied. The E-UTRAN system is an evolution from the existing UTRAN system and is currently undergoing basic standardization work in 3GPP. The E-UTRAN system is also called a Long Term Evolution (LTE) system.

The E-UTRAN consists of base stations (hereinafter abbreviated as eNode B or eNB). The eNBs are connected via an X2 interface. The eNB is connected to a user equipment (hereinafter abbreviated as UE) through a wireless interface and is connected to an Evolved Packet Core (EPC) through an S1 interface.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer. The radio resource control layer (hereinafter referred to as RRC) layer located in the layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the network.

2 and 3 illustrate a structure of a radio interface protocol between a terminal based on a 3GPP radio access network standard and an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). In particular, Figure 2 is a structure of the control plane of the wireless protocol, Figure 3 is a structure of the user plane of the wireless protocol.

The wireless interface protocol of FIGS. 2 and 3 consists of a physical layer, a data link layer, and a network layer horizontally, and vertically a user plane for transmitting data information. It is divided into User Plane and Control Plane for Signaling. The protocol layers of FIGS. 2 and 3 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, and include L1 (first layer), L2 (second layer), It may be classified as L3 (third layer). Hereinafter, each layer of the wireless protocol control plane of FIG. 2 and the wireless protocol user plane of FIG. 3 will be described.

The physical layer, which is the first layer, provides an information transfer service to an upper layer by using a physical channel. The physical layer is connected to the upper medium access control layer through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Then, data is moved between different physical layers, that is, between physical layers of a transmitting side and a receiving side through physical channels. The physical channel is modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

Medium access control (hereinafter referred to as MAC) of the second layer provides a service to a radio link control layer, which is a higher layer, through a logical channel. The radio link control layer (hereinafter referred to as RLC) layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC layer. In this case, the RLC layer may not exist. In the wireless protocol user plane, the PDCP layer of the second layer reduces the IP packet header size that contains relatively large and unnecessary control information for efficient transmission in a wireless bandwidth where bandwidth is low when transmitting IP packets such as IPv4 or IPv6. The master performs the header compression function.

The radio resource control layer (hereinafter abbreviated as RRC) layer located at the top of the third layer is defined only in the control plane, and the configuration and reset of the radio bearer (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release. In this case, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN. If there is an RRC connection (RRC Connection) between the RRC of the terminal and the RRC layer of the wireless network, the terminal is in the RRC connected mode (Connected Mode), otherwise it is in the RRC idle mode (Idle Mode).

The NAS (Non-Access Stratum) layer located above the RRC layer performs functions such as session management and mobility management.

One cell constituting the eNB is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 20Mhz to provide a downlink or uplink transmission service to multiple terminals. In this case, different cells may be configured to provide different bandwidths.

The downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information, a Paging Channel (PCH) for transmitting a paging message, and a downlink SCH (Shared Channel for transmitting user traffic or control messages). There is. Traffic or control messages of the downlink point-to-multipoint service (multicast or broadcast service) may be transmitted through the downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), and an MBMS point-to-multipoint control channel / MCCH. Multicast Control Channel) and MTCH (MBMS point-to-multipoint Traffic Channel / Multicast Traffic Channel).

4 illustrates a control channel transmission of the prior art.

The physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis. Here, one sub-frame consists of a plurality of symbols on the time axis. One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific symbols (eg, the first symbol) of the corresponding subframe for a physical downlink control channel (PDCCH), that is, an L1 / L2 control channel. One subframe is 0.5 ms, and a transmission time interval (TTI), which is a unit time for transmitting data, is 1 ms corresponding to two subframes.

The wireless network may perform a counting process to determine the existence of a terminal receiving a specific point-to-multipoint service in a specific cell or to count the number of terminals. In the point-to-many service counting process, when the wireless network transmits an access information message through the MCCH channel, the terminal responds to the access information message with an RRC connection setup message or a cell update message. Speak the process of sending it.

As described above, in the prior art, the wireless network transmits an MBMS access information message for the MBMS coefficient, and the terminal transmits an RRC connection request message or a cell update message in response to the access information message. It was. In this case, since the size of the RRC connection request message or the cell update message transmitted upward is large, a large amount of uplink radio resources are used for the MBMS coefficient, which causes a large problem of inefficient use of the radio resources.

Accordingly, in the present invention, in order to efficiently use the uplink radio resource, the terminal receiving the response request message transmits an uplink radio access preamble according to the information of the response request message, and receives a response message for the uplink radio access preamble, When the response message includes the terminal identifier together with the identifier of the preamble, the message is transmitted upward. If the response message includes the identifier of the preamble but there is no terminal identifier, the message is not transmitted upward.

In order to solve the problems of the present invention as described above, a method of receiving a point-to-multipoint communication service in a wireless communication system according to the present invention, the access information (access information) message for the point-to-multipoint service Transmitting a random access preamble after receiving and receiving the access information message; Receiving a random access response in response to the random access preamble; And determining whether or not to transmit a response message for the random access according to the information included in the received random access response.

Preferably, the point-to-multipoint service is a multimedia broadcast / multicast service (MBMS) service, and the access information message is an MBMS access information message and includes the MBMS service ID.

Preferably, the random access preamble is characterized in that one of the preambles included in the access information message.

Preferably, the random access preamble is characterized in that the network is a terminal-specific preamble previously designated.

Preferably, the random access response includes a preamble identifier, timing adjustment information, newly allocated Control-Radio Network Temporary Identities (C-RNTI), and uplink radio resource allocation information. It characterized in that it comprises at least one of.

Preferably, when the random access response includes the preamble identifier and the newly allocated C-RNTI, the response message is transmitted to a network.

Preferably, when the random access response does not include the newly allocated C-RNTI, the message is not transmitted to the network.

Preferably, the response message is a counting response message according to the uplink radio resource allocation information.

Preferably, the count response message is characterized in that the C-RNTI and MBMS service identifier (MBMS service ID).

Preferably, the method further comprises receiving a contention resolution message in response to the count response message.

Preferably, the conflict resolution message is characterized in that it comprises the C-RNTI and MBMS service ID (MBMS service ID).

Preferably, the collision resolution message is received through an RRC message, a MAC control protocol data unit (PDU) or a physical downlink control channel (PDCCH).

In addition, in order to solve the problems of the present invention as described above, as a method for transmitting a point-to-multipoint service in a wireless communication system according to the present invention, an access information message for the point-to-multipoint service Transmitting and receiving a random access preamble after the access information message is transmitted; Transmitting a random access response in response to the received random access preamble; The random access response may be used to determine whether or not the terminal transmits a response message according to the information included in the random access response.

Preferably, the point-to-multipoint service is a multimedia broadcast / multicast service (MBMS) service, and the access information message is an MBMS access information message and includes the MBMS service ID.

Preferably, the random access response includes a preamble identifier, timing adjustment information, newly allocated Control-Radio Network Temporary Identities (C-RNTI), and uplink radio resource allocation information. It characterized in that it comprises at least one of.

Preferably, when the random access response includes the identifier of the random access preamble and the newly allocated C-RNTI, the response message is received from the terminal.

Preferably, the response message is a counting response message according to the uplink radio resource allocation information.

Preferably, the count response message is characterized in that the C-RNTI and MBMS service identifier (MBMS service ID).

Preferably, the method further comprises transmitting a contention resolution message in response to the count response message.

Preferably, the conflict resolution message is characterized in that it comprises the C-RNTI and MBMS service ID (MBMS service ID).

Preferably, the coefficient response message is received through an RRC message or a MAC control protocol data unit (PDU) and the conflict resolution message is an RRC message, a MAC control protocol data unit (PDU) or a physical downlink control channel (PDCCH). It is characterized by being transmitted.

According to the present invention, the terminal receiving the response request message transmits an uplink radio access preamble according to the information of the response request message, receives a response message for the uplink radio access preamble, and identifies the terminal with the identifier of the preamble in the response message. If there is a message is transmitted upward, and if there is no terminal identifier not to transmit the message upwards, there is a great effect to efficiently use the uplink radio resources.

The present invention is applied to 3GPP communication technology, in particular UMTS (Universal Mobile Telecommunications System) system, communication device and communication method. However, the present invention is not limited thereto and may be applied to all wired and wireless communication to which the technical spirit of the present invention can be applied.

The basic concept of the present invention is that the present invention provides an access information message for the point-to-multipoint service in a method for receiving a point-to-multipoint service on a wireless communication system for efficient use of radio resources. Transmitting a random access preamble after receiving the access information message and receiving the access information message; Receiving a random access response in response to the random access preamble; The present invention proposes a method for determining whether or not to transmit a response message for the random access according to the information included in the received random access response, and proposes a wireless mobile communication terminal capable of performing the method.

Meanwhile, the present invention provides a method for transmitting a point-to-multipoint service on a wireless communication system for efficient use of radio resources, the method comprising: transmitting an access information message for the point-to-multipoint service; Receiving a random access preamble after the access information message is transmitted; Transmitting a random access response in response to the received random access preamble; The random access response proposes a method used to determine whether or not the terminal transmits a response message according to the information included in the random access response, and a network on a wireless mobile communication system capable of performing such a method or We propose a base station.

Hereinafter, the configuration and operation of the embodiments according to the present invention will be described with reference to the accompanying drawings.

5 illustrates an MBMS counting process according to the present invention. First, the eNB may transmit an access information message through a multicast control channel (MCCH) channel to count the number of UEs that want to receive a specific MBMS service. In this case, the access information message may be an RRC message or a MAC control protocol data unit (PDU). The access information message may include a specific preamble or a preamble set for the specific MBMS service.

Meanwhile, the eNB may transmit the access information message through a physical downlink control channel (PDCCH) channel. In this case, the PDCCH channel may transmit an identifier of the MBMS service and may also transmit a coefficient indicator. Here, when the terminal receiving the specific broadcast service receives the access information message, the terminal may preamble one of the preambles included in the preamble set included in the access information message or the specific preamble for the specific service. (random access preamble, a service dedicated signature) is selected and transmitted to the eNB. If the terminal has a terminal dedicated preamble (UE dedicated signature), the terminal may transmit a terminal-only preamble that does not need to send a conflict resolution message later to the eNB instead of the selected preamble.

Thereafter, the eNB may transmit a random access response to the terminal after receiving the preamble. In this case, the random access response may include an identifier of the preamble, timing adjustment information (Timing Adjustment), newly allocated C-RNTI, uplink radio resource allocation information, and the like.

Here, after the terminal receives the random access response, if there is an identifier of a preamble transmitted by the terminal and a newly allocated C-RNTI in the random access response, the terminal responds to the count according to the uplink radio resource allocation information. A counting response message may be transmitted to the eNB. In this case, the count response message may include a terminal identifier and an identifier of the specific broadcast service. In addition, the count response message may be transmitted to the eNB via an RRC message, or may be transmitted through a MAC control PDU. In this case, the eNB counts the terminal as a terminal receiving the specific broadcast service according to the reception of the count response message.

However, after the terminal receives the random access response, if there is an identifier of the preamble transmitted by the terminal in the random access response, but there is no newly allocated C-RNTI or there is no uplink radio resource allocation information, the terminal A count response message may not be sent to the eNB. In this case, the eNB counts the terminal as a terminal receiving the specific broadcast service according to the reception of the preamble.

In other words, after transmitting with or including an MBMS dedicated signature in the preamble, if there is no C-RNTI assigned in the received random access response, the UE (MBMS UE) sends the count response message. It may be decided not to transmit, and if there is a C-RNTI assigned in the received random access response, the UE (MBMS UE) may decide to transmit the count response message.

Here, if the preamble is included in the access information message or assigned from the access information message, collision between MBMS UEs in which the same MBMS service is activated may occur. Therefore, after the UE successfully transmits the count response message, the eNB may transmit a contention resolution message. Here, the conflict resolution message may be transmitted through an RRC message, a MAC control PDU or a PDCCH. In addition, the conflict resolution message may include the terminal identifier and the identifier of the specific broadcast service.

Hereinafter, a terminal according to the present invention will be described.

The terminal according to the present invention includes all types of terminals that can use a service that can exchange data with each other over the air. That is, the terminal according to the present invention is a mobile communication terminal capable of using a wireless communication service (for example, user equipment (UE), mobile phone, cellular phone, DMB phone, DVB-H phone, PDA phone, and PTT phone, etc.) It is a comprehensive meaning including laptops, laptops, laptops, digital TVs, GPS navigation, handheld game consoles, MP3s, and other consumer electronics.

The terminal according to the present invention may include a basic hardware configuration (transmitter / receiver, processor or controller, storage unit, etc.) required to perform functions and operations for efficient use of radio resources illustrated by the present invention.

The method according to the invention described thus far can be implemented in software, hardware, or a combination thereof. For example, the method according to the present invention may be stored in a storage medium (eg, internal memory of a mobile terminal or base station, flash memory, hard disk, etc.) and may be stored in a processor (eg, mobile terminal or base station). Code or instructions within a software program that can be executed by an internal microprocessor).

In the above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a network structure of E-UTRAN, which is a mobile communication system to which the present invention and the present invention are applied.

Figure 2 is an exemplary view showing a control plane structure of a radio interface protocol between the terminal and the E-UTRAN in the prior art.

3 is an exemplary diagram illustrating a user plane structure of a radio interface protocol between a terminal and an E-UTRAN in the prior art.

4 is an exemplary view showing a structure of a physical channel for control channel transmission in the prior art.

5 is an exemplary view showing an MBMS counting process according to the present invention.

Claims (21)

A method of receiving point-to-multipoint services on a wireless communication system, Receiving an access information message for the point-to-many service; Transmitting a random access preamble after receiving the access information message; Receiving a random access response in response to the random access preamble; Determining whether or not to transmit a response message for the random access according to the information included in the received random access response. Point-to-multipoint in a wireless communication system How to receive a service. The wireless communication system of claim 1, wherein the point-to-multipoint service is a multimedia broadcast / multicast service (MBMS) service, and the access information message is an MBMS access information message and includes the MBMS service ID. To receive point-to-multipoint services on the fly. The method of claim 1, wherein the random access preamble is one of the preambles included in the access information message. 2. The method of claim 1, wherein the random access preamble is a terminal-specific preamble previously designated by the network. The method of claim 1, wherein the random access response includes a preamble identifier, timing adjustment information, newly allocated Control-Radio Network Temporary Identities (C-RNTI), and uplink radio resource allocation information. A method for receiving point-to-multipoint services in a wireless communication system comprising at least one of allocation information. 6. The method of claim 5, wherein if the random access response includes the preamble identifier and the newly allocated C-RNTI, the response message is transmitted to a network. multipoint) how to receive service. 6. The method of claim 5, wherein if the random access response does not include the newly allocated C-RNTI, a message is not transmitted to a network. The point-to-multipoint service is received in a wireless communication system. How to. 7. The method of claim 6, wherein the response message is a counting response message according to the uplink radio resource allocation information. 10. The method of claim 8, wherein the count response message comprises the C-RNTI and an MBMS service identifier (MBMS service ID). 9. The method of claim 8, further comprising receiving a contention resolution message in response to the count response message. Way. 12. The method of claim 10, wherein the conflict resolution message comprises the C-RNTI and an MBMS service ID. 12. The method of claim 11, wherein the collision resolution message is point-to-multipoint in a wireless communication system, which is received through an RRC message, a MAC control protocol data unit (PDU) or a physical downlink control channel (PDCCH). ) How to receive service. A method of transmitting point-to-multipoint services on a wireless communication system, Transmitting an access information message for the point-to-many service; Receiving a random access preamble after the access information message is transmitted; Transmitting a random access response in response to the received random access preamble; The random access response is point-to-multipoint on a wireless communication system, characterized in that it is used to determine whether or not the terminal transmits a response message according to the information included in the random access response. ) How to send a service. The wireless communication system of claim 13, wherein the point-to-multipoint service is a multimedia broadcast / multicast service (MBMS) service, and the access information message is an MBMS access information message and includes the MBMS service ID. To send point-to-multipoint services on the fly. 15. The method of claim 13, wherein the random access response comprises a preamble identifier, timing adjustment information, newly allocated Control-Radio Network Temporary Identities (C-RNTI), and uplink radio resource allocation information. A method for transmitting point-to-multipoint services on a wireless communication system comprising at least one of allocation information. 16. The method of claim 15, wherein the response message is received from a terminal when the random access response includes an identifier of the random access preamble and the newly allocated C-RNTI. -to-multipoint) How to send a service. 17. The method of claim 16, wherein the response message is a counting response message according to the uplink radio resource allocation information. 18. The method of claim 17, wherein the count response message includes the C-RNTI and an MBMS service identifier (MBMS service ID). 18. The method of claim 17, further comprising transmitting a contention resolution message in response to the count response message. Way. 20. The method of claim 19, wherein the conflict resolution message includes the C-RNTI and an MBMS service identifier. 21. The method of claim 20, wherein the count response message is received through an RRC message or a MAC control protocol data unit (PDU) and the conflict resolution message is an RRC message, a MAC control protocol data unit (PDU) or a physical downlink control channel (PDCCH). A method for transmitting point-to-multipoint services on a wireless communication system, characterized in that the transmission is via.

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