KR100885157B1 - Information transfer method for data transmission in mobile communication syystem - Google Patents

Abstract

The present invention provides an information transmission method of a terminal for transmitting downlink data in a mobile communication system and an operation method of a base station for supporting the same. According to the present invention, when a mobile / fixed terminal enters an idle mode and requests a base station to maintain information used by a base station in classifying a packet in a normal mode, when the packet (data) arrives at the router, For the ARP request (IPv4) and neighbor solicitation (Ipv6) of the router, the base station transmits an ARP response (IPv4) or neighbor advertisement (IPv6) to the router on behalf of the terminal. Therefore, when the mobile / fixed terminal is in the idle mode or the sleep mode for power saving, data can be effectively transmitted from the router to the mobile / fixed terminal through the base station.

Idle mode, sleep mode, CS information maintenance request, IP packet

Description

Information transmission method for data transmission in mobile communication system {INFORMATION TRANSFER METHOD FOR DATA TRANSMISSION IN MOBILE COMMUNICATION SYYSTEM}

1 illustrates the format of a DSA-REQ message.

2 illustrates a format of a DSA-RSP message.

3 shows a format of a DSA-ACK message.

4 is a diagram illustrating an example of a registration request message (DREG-REQ) transmitted by a terminal to a base station in order to switch to an idle mode.

5 is a diagram illustrating an example of a paging message that a terminal receives from a base station.

6 is a diagram illustrating a conventional method of transmitting an incoming IP packet.

7 is a diagram showing an example of a registration request message (DREG-REQ) according to the present invention;

8 illustrates an example of a CS information retain request according to the present invention.

9 illustrates an example of a terminal information (MOB-INFO) message according to the present invention.

10 is a diagram illustrating an operation of a base station for data transmission when the terminal enters an idle mode.                 

11 is a diagram illustrating an operation of a base station for data transmission when entering an idle mode by a command of a base station.

12 is an exemplary view showing the overall operation of the present invention for the idle mode.

***** Explanation of symbols for the main parts of the drawing *****

10: router 20: terminal

The present invention relates to a mobile communication system, and more particularly, to an information transmission method for transmitting downlink data and an operation method of a base station for supporting the same.

Unlike the existing 2nd and 3rd generation mobile communication systems, the IEEE802.16e system, which is undergoing international standardization for broadband wireless access system, has a HLR (Home Location Register), VLR (Visitor Location Register), MSC (Mobile Switching Center), Rather than having a hierarchical structure such as BSC (Base Station Controller) and RNC (Radio Network Controller), MSS (Mobile Subscriber Station) as a terminal, BS (Base Station) as a base station, and ASA (Authenticastion Service Authorization) as an authentication management server It consists only.

In addition, a common physical layer (PHY) and a medium access control layer (MAC) are defined in the base station and the mobile / fixed terminal. The base station includes a convergence sublayer (MAC) for a specific service on the MAC, and performs classification on packets transmitted from the network. The classification is performed by a classifier of the convergence layer layer, and mapping between data transmitted from the network (eg, SDU: Service Data Unit) and connection ID (CID) used in a broadband wireless access system is performed. Is performed through. The mapped SDU is delivered to the MAC layer.

In the broadband wireless access system, after the transmission of the operating parameters is completed (after the network access procedure is completed), a service request, response, and confirmation (for a service between a mobile / fixed terminal (hereinafter referred to as a terminal) and a base station) are performed. Acknowledge procedure. The base station and the terminal perform the service request, response and confirmation through DSA-REQ, DSA-RSP, and DSA-ACK messages, and reserve necessary resources (bandwidth, IP address, etc.).

1 to 3 are formats of DSA-REQ, DSA-RSP and DSA-ACK messages.

The UE transmits the DSA-REQ, the DSA-RSP, and the DSA-ACK message including information related to the convergence sublayer (CS) of the base station. This information includes CS specification, CS parameter encoding rules (e.g. ATM, Packet IPv4, Packet IPv6, Packet 802.3 / Ethernet, Packet IPv4 over 802.3 / Ethernet, etc.), IP source address, IP purpose ( destination) address, protocol source port range, protocol destination port range, and 802.3 / Ethernet destination MAC address.

In such a broadband wireless access system, a request for adding a service can be started by both a base station and a terminal. In this case, a unique number for adding a service is indicated in a Transaction ID. That is, the request, response, and confirmation for adding one service are separated by the same Transaction ID.

The DSA-RSP in response to the DSA-REQ and the Confirmation Code included in the DSA-ACK in response to the DSA-RSP shall indicate whether or not to accept or reject the DSA-REQ. Identifier that identifies the reason for. The TLV Encoded Information field includes information on service quality (maximum allowable delay time and distribution of delay time, etc.), IP packet availability and IP version (IP version 4 or IP version 6) required for service.

In addition, the broadband wireless access system supports the idle mode (Idle Mode) in order to minimize the power consumption of the terminal. The UE in the idle mode does not need to perform a handoff procedure when moving between base stations included in the same paging zone. Accordingly, the terminal does not need to transmit uplink information for the handoff procedure, thereby reducing power consumption.

Normally, the terminal entering the idle mode can be freely moved in the same paging area without performing the handoff procedure by normally receiving the periodic paging as long as there is no information to be received or transmitted. In the idle mode, a paging area is defined as an entire area that is handled by a plurality of base stations called paging groups. Base stations included in the same paging area have the same value of paging cycle and paging offset.

Accordingly, the terminal may request the base station to switch to the idle mode, and the base station transmits its paging area ID (paging-group ID), the paging period and the paging offset accordingly, the terminal may switch to the idle mode state. .

During the idle mode, the terminal may determine whether to continuously maintain or terminate the idle mode through paging (call) delivered from the base station in a broadcast form at each paging period. When there is traffic to be transmitted in the idle mode, the terminal can exit the idle mode at any time, and when there is traffic to be delivered to the terminal in the idle mode. The base station may cause the terminal to terminate the idle mode through paging.

If the terminal in the idle mode does not receive the paging at a predetermined time due to moving to another paging area or losing synchronization, the terminal terminates the idle mode.

Next, the procedure of switching the terminal to the idle mode is as follows.

First, the terminal transfers the registration request message (DREG-REQ), that is, the idle mode request message shown in FIG. 4 to the serving base station in order to switch to the idle mode. The DREG-REQ is used to terminate the broadband wireless access system service of the terminal (eg, power off) or enter an idle mode, and is a termination of the broadband wireless access system service as a de-registration request code. Identifies whether the switch is to idle mode.

When the DREG-REQ is received, the service base station transmits a paging group ID, a paging period, and a paging offset value to the terminal through an idle mode response message, and releases connection information with the terminal and radio resources allocated to the terminal. Subsequently, the base station notifies the base stations of the paging group to which it belongs the MAC address of the terminal to switch to the idle mode, so that the terminal can be paged in the same paging period.

Therefore, whether the terminal, which is permitted to switch to the idle mode through the idle mode response message, has downlink traffic delivered to itself through a paging message of a broadcast type delivered from the base station according to a paging period, or should ranging be performed? If not, determine if it should remain idle. 5 illustrates an example of a paging message that the terminal receives from the base stations of the paging group at regular intervals.

Therefore, when the terminal receives the downlink traffic through the paging message, the terminal exits the idle mode and re-registers with the network to receive the downlink data traffic, and if the terminal is requested to perform ranging through the paging message, ranging The base station causes the base station to update the location of the terminal and the valid idle mode terminal list.

On the other hand, when the terminal is received to not perform any action through the paging message, the terminal continues to remain in the idle mode without a specific action. In addition, when the terminal generates an uplink traffic or a downlink traffic or the paging group is transferred to another base station to terminate the idle mode, the base station notifies the base stations belonging to the same paging group to the fact that the terminal from the idle mode terminal list Allow to delete.

In general, the data service is made in the form of a response that the terminal makes a service request to the network, but in the case of the incoming IP packet (for example, Push To Talk, VoIP, etc.) service, data is transmitted from the service counterpart without a request of the terminal. It may be transmitted to the terminal.

6 is a diagram illustrating a conventional method of transmitting an incoming IP packet.

As shown in FIG. 6, when a data packet (IP datagram) for a specific service is delivered, the router 10 searches for a base station to which the terminal 20 to receive the data packet is connected, for example, such as ARP. By using the method broadcasts the address (eg, IP address) of the terminal 20 to the base stations (BS1 ~ BS3). Here, ARP is an IPv4 protocol used when converting a network address (IP address) into a link layer address (MAC address or Ethernet address).

Each of the base stations Bs1 to BS3 checks the address of the corresponding terminal 20, and the base station having the address of the terminal 20 responds to the broadcast of the router 10. In this example, it is assumed that the base station BS1 responds.

Therefore, the router 10 transmits data to the base station BS1, and the base station BS1 transmits data for the IP packet to the terminal 20, thereby smoothly performing packet service.

As described above, when operating in the idle mode to reduce battery consumption, the terminal informs the base station of the fact through the DREG-REQ message, and the base station is allocated resources and information (terminal IP address information, etc.) ). In addition, as described above, in a specific service such as Push To Talk and VoIP, data (IP packet) may be transmitted from the other party (router) of the service to the mobile / fixed terminal without the request of the terminal.

However, since the base station releases the terminal's IP address when the terminal operates in the idle mode, data transmitted from the router cannot be transmitted to the terminal through the base station. That is, when data to be transmitted to the terminal in the idle mode arrives, for the ARP request (IPv4) or neighbor solicitation (Ipv6) of the router for transmitting the data, the base station provides information for transmitting the corresponding data to the terminal. Because it did not have it, it could not receive an IP packet from the network.

Accordingly, it is an object of the present invention to provide a method in which specific service data can be efficiently transmitted from a router to a terminal through a base station in idle mode and sleep mode.

Another object of the present invention is to provide a method in which a base station maintains address information on a terminal even when a terminal operates in an idle mode or a sleep mode when using a specific service.

In order to achieve the above object, the data transmission and reception method in the broadband wireless access system according to the present invention, in a broadband wireless access system,
Sending a request message to the first network entity requesting to maintain convergence sublayer (CS) information; Entering idle mode after receiving a response message from the first network entity; Receiving a paging message from a second network entity during the idle mode; And entering the second network entity.
Advantageously, further comprising receiving a data packet from said second network entity.
In addition, in order to achieve the above object, the data transmission and reception method in the broadband wireless access system according to the present invention, in a broadband wireless access system,
Sending a request message to the network entity requesting to maintain convergence sublayer (CS) information; Entering idle mode after receiving a response message from the network entity; Receiving a paging message from a network entity during the idle mode; And entering the network entity.
Advantageously, further comprising receiving a data packet from said network entity.
In addition, in order to achieve the above object, a data transmission and reception method in a broadband wireless access system according to the present invention,
In a broadband wireless access system,
Receiving, by the first network entity, a request message from the mobile terminal requesting to maintain convergence sublayer (CS) information; Allowing the first network entity to enter the idle mode of the mobile terminal by sending a response message to the mobile terminal; Sending, by the second network entity, a paging message during the idle mode; And allowing the mobile terminal to enter the second network entity.
Advantageously, further comprising sending a data packet from said second network entity to said mobile terminal.
In addition, in order to achieve the above object, a data transmission and reception method in a broadband wireless access system according to the present invention,
In a broadband wireless access system,
Receiving, by the network entity from the mobile terminal, a request message requesting to maintain convergence sublayer (CS) information; Allowing the network entity to enter the idle mode of the mobile terminal by sending a response message to the mobile terminal; Sending, by the network entity, a paging message during the idle mode; And allowing the mobile terminal to enter the network entity.
Advantageously, the network entity further comprises transmitting a data packet to said mobile terminal.
In addition, in order to achieve the above object, the mobile communication system according to the present invention,
At least one mobile terminal; And at least one network entity,
The network entity receives a request message from the mobile terminal requesting to maintain convergence sublayer (CS) information,
Allowing the network entity to enter the idle mode by sending a response message to the mobile terminal,
During the idle mode, the network entity sends a paging message,
Allowing the mobile terminal to enter the network entity.
Preferably, the mobile terminal,
Send a request message to the network entity requesting to maintain the convergence sublayer (CS) information, enter the idle mode after receiving a response message from the network entity, and enter the network entity during the idle mode. Receive a paging message from the network entity and enter the network entity.

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The present invention is implemented in a broadband wireless access system. However, the present invention can also be applied to a wireless communication system operating according to other standards. Hereinafter, preferred embodiments of the present invention will be described in detail.

According to the present invention, when a mobile / fixed terminal (hereinafter referred to as a terminal) using a specific service (eg, Push To Talk and VoIP) is in an idle mode, the base station should perform a smooth transmission of the downlink packet from the router to the terminal. Suggests an operation to do.

To this end, the base station maintains the address information for the terminal even if the terminal operates in the idle mode when the terminal uses a specific service (e.g., Push To Talk, VoIP, etc.). That is, when the terminal needs to receive the IP packet in the idle mode, the convergence sublayer of the base station classifies the IP packet and maps it to the MAC address of the target terminal of the IP packet and transmits the information to the MAC layer. Ask to keep.

First, the present invention defines the following message.

REGISTRATION REQUEST (DREG-REQ) MESSAGE: This message is a message that the UE requests to unregister as a base station to enter idle mode. The registration request (DREG-REQ) message, as shown in Figure 7, the base station on behalf of the terminal for the ARP request (for IPv4) or Neighbor Solicitation (for IPv6) transmitted from the router after the idle mode transition In order to make a response, the terminal further includes a TLV tuple portion for informing the base station to maintain information used when the base station classifies the IP packet when the terminal is in the normal mode.

For example, if the registration request code (De-Registration_Request_Code) is 0x01, the terminal tells the base station to maintain the information used when the base station classifies the IP packet in the normal mode, that is, in Figure 8 Add the illustrated CS information retain request. That is, if Bit # 0 is set in the CS information maintenance request, the terminal requests the base station to maintain information used when the base station classifies the IP packet in the normal mode.

-MOB-INFO message: This message is a message for the UE to inform the base station to maintain the information used by the base station to classify the IP packet in the normal mode when the terminal enters the idle mode by the base station. An example of the MOB-INFO is illustrated in FIG. 9, and other types of messages may be used as long as the base station can inform to maintain the information used for IP packet classification of the terminal in the normal mode.

In the present invention, when the terminal transitions to the idle mode, the terminal requests the base station to maintain existing information according to the service to be received in the idle mode so that the base station can receive the IP packet to be delivered to the terminal.

In addition, when the terminal transitions to the idle mode by the command of the base station, the terminal informs the base station to maintain the information used when the base station classifies the IP packet (in the normal mode) before the transition to the idle mode.

10 is a diagram illustrating an operation of a base station for data transmission when the terminal enters an idle mode.

Referring to FIG. 10, the terminal MSS transmits a message (DREG-REQ) requesting deregistration to the base station BS # 1 to enter the idle mode, and the base station BS # 1 responds to the deregistration request. In step S10, the UE requests to maintain the information used when the base station classifies the IP packet when the UE is in the normal mode, and transmits to the MS the router. If there is an ARP request of the base station to allow the ARP response instead.

The base station (host base station) BS # 1, which has performed the deregistration procedure by the MSS, transmits to all base stations BS # 2 and BS # 3 in the same paging area through paging announce. Notifying that the transition to the idle mode (S11), each base station receiving the paging notification registers the MAC address of the MSS in the paging list.                     

Then, when the data (IP packet) to be delivered to the terminal arrives, the router sends an ARP request to the base station (MS # 1) to find the MAC address corresponding to the IP address of the data (S12), the base station (BS # 1) in response to the ARP request of the router transmits an ARP response on behalf of the terminal (S13).

When the ARP response is received from the base station BS # 1, the router transfers the data to the base station BS # 1, and the base station BS # 1 stores the transferred data and then uses the paging notification to transmit the same paging area. The base stations BS # 2 and BS # 3 are notified that the data to be delivered to the terminal MSS has arrived (S14).

Accordingly, each of the base stations BS # 2 and BS # 3 that has received the paging notification from the base station BS # 1 calls (paging) the terminal with the corresponding MAC address during the paging period (S15). That is, the paging message is transmitted to the terminal. If the action code of the paging message transmitted from the base station BS # 3 is set to "10" indicating an initial network entry, the terminal MSS is connected to the base station BS # 3. By performing a ranging procedure and an initial network access procedure (S16, S17), the base station BS # 3 transmits data to the MSS connected to the network (S18).

11 is a diagram illustrating an operation of a base station for data transmission when entering an idle mode by a command of a base station.

11 shows an operation of informing the base station to maintain information used by the base station to classify the IP packet when the terminal is in the normal mode because the terminal enters the idle mode by a command of the base station (MOB-INFO). Except) is substantially the same as the embodiment shown in FIG.

12 is an exemplary view showing the overall operation of the present invention for the idle mode.

As shown in FIG. 12, when an IP packet to be transmitted to the terminal arrives, the router transmits an ARP request, and the base station (host base station) has made a request for termination of registration in order for the terminal to transition to idle mode. BS1 transmits an ARP Reply to an ARP request on behalf of the terminal to the router using the "CS information request" transmitted when the terminal transitions to the idle mode.

When the ARP response is received, the router forwards the packet to the base station BS1. The base station BS1 stores the forwarded packet (data) and then transmits the packet to all base stations within the same paging area through paging notification. MAC address) indicates that there is downlink data to be transmitted.

Accordingly, the base stations (eg BS2) in the paging area broadcast the paging message (MOB-PAG-ADV) to the corresponding terminal during the paging broadcast cycle, and have the corresponding MAC address among the terminals that listened to the message. The terminal performs a network access procedure and then receives data transmitted from a router.

In addition, the present invention has been described using the idle mode as an example for convenience of explanation, but the same applies when the mobile / fixed terminal is in the sleep mode for power saving. That is, when the terminal enters the sleep mode through the sleep request message (MOB-SLP-REQ), when entering the sleep mode by the command of the base station through the terminal information (MOB-INFO) message, the terminal through the normal mode May request from the base station to maintain the information used by the base station to classify the IP packet.

As described above, according to the present invention, when a mobile / fixed terminal enters an idle mode and requests a base station to maintain information used when the base station classifies an IP packet in a normal mode, when the packet (data) arrives at the router. For the ARP request (IPv4) and neighbor solicitation (Ipv6) of the router for the data transfer, the base station transmits an ARP response (IPv4) or neighbor advertisement (IPv6) to the router on behalf of the corresponding terminal. Accordingly, when the mobile / fixed terminal is in the idle mode or the sleep mode for power saving, data can be transmitted from the router to the mobile / fixed terminal through the base station.

In addition, although the present invention has been described with reference to the embodiments illustrated in the drawings, this is 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.

Claims (30)

In a broadband wireless access system, Transmitting, by the mobile terminal, a request message to the first network entity requesting to maintain convergence sublayer (CS) information of the mobile terminal; Entering the idle mode by the mobile terminal after receiving a response message from the first network entity; Receiving, by the mobile terminal, a paging message from a second network entity during the idle mode; And The mobile terminal entering the second network entity Data transmission and reception method in a broadband wireless access system comprising a. The method of claim 1, Receiving, by the mobile terminal, a data packet from the second network entity. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 2, The data packet corresponds to convergence sublayer information of the mobile terminal maintained in the first network entity. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 1, Convergence sublayer information of the mobile terminal is information related to a service provided to the mobile terminal. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 1, Convergence sublayer information of the mobile terminal is information related to a service provided to the mobile terminal during the idle mode. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 1, The request message is a deregistration request (DREG-REQ) message. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. delete delete delete delete delete delete delete delete In a broadband wireless access system, Receiving, by the first network entity, a request message from the mobile terminal requesting to maintain convergence sublayer (CS) information of the mobile terminal; Allowing the first network entity to enter the idle mode of the mobile terminal by sending a response message to the mobile terminal; Sending, by the second network entity, a paging message during the idle mode; And Allowing the mobile terminal to enter the second network entity; Data transmission and reception method in a broadband wireless access system comprising a. The method of claim 15, Sending a data packet from the second network entity to the mobile terminal. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 16, The data packet corresponds to convergence sublayer information of the mobile terminal maintained in the first network entity. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 15, Convergence sublayer information of the mobile terminal is information related to a service provided to the mobile terminal. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 15, Convergence sublayer information of the mobile terminal is information related to a service provided to the mobile terminal during the idle mode. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. The method of claim 15, The request message is a deregistration request (DREG-REQ) message. Method of transmitting and receiving data in a broadband wireless access system, characterized in that. delete delete delete delete delete delete delete delete At least one mobile terminal; And Include at least one network entity, The network entity receives a request message from the mobile terminal requesting to maintain convergence sublayer (CS) information of the mobile terminal, Allowing the network entity to enter the idle mode by sending a response message to the mobile terminal, During the idle mode, the network entity sends a paging message, Allowing the mobile terminal to enter the network entity Mobile communication system, characterized in that. The method of claim 29, The mobile terminal, Send a request message to the network entity requesting to maintain convergence sublayer (CS) information of the mobile terminal; Enters the idle mode after receiving a response message from the network entity, Receive a paging message from the network entity during the idle mode, Entering the network entity Mobile communication system, characterized in that.

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