KR20110071768A - Method for paging in wireless communication system - Google Patents

Abstract

PURPOSE: A paging method in the wireless telecommunications system is provided to transmit the paging information to the terminal receiving a MBS(Multicast/Broadcast Service) from a base station. CONSTITUTION: A base station confirms whether the terminal receives MBS or not(S510). In case the terminal receives MBS, the base station transmits the paging related information considering MBS to the terminal(S520). The paging related information considering MBS comprises the paging offset information and the paging cycle information. The paging pre-defined option information and the paging cycle information are set so that the frame, in which the MBS burst assignment information, is accord with the frame in which the paging message can be transmitted.

Description

Paging method in wireless communication system {Method for paging in wireless communication system}

The present invention relates to wireless communication, and more particularly, to a method of transmitting a paging message by a base station to a terminal receiving a multicast / broadcast service (MBS).

The present invention is derived from a study conducted as part of the IT New Growth Engine Core Technology Development Project of the Ministry of Knowledge Economy [Task Management No .: 2009-F-034-01, Project Name: IMT-Advanced based Broadband Wireless Channel Study].

Multicast / Broadcast Service (MBS) is a method in which one base station simultaneously transmits data packets to a plurality of terminals. MBS may be used interchangeably with terms such as multimedia broadcast multicast service (MBMS), broadcast / multicast service, and point to multipoint service. MBS is based on IP (Internet Protocol) multicast, and a plurality of terminals share the necessary resources for data packet transmission and receive the same multimedia data. Therefore, when a terminal of a certain level using the MBS exists in the same cell, it is possible to increase the efficiency of resource usage. The MBS is independent of the RRC (Radio Resource Control) connection state, and the terminal in the idle mode may also receive the MBS.

There are two types of MBS operations, broadcast and multicast. The broadcast method is a method in which one base station transmits data to all terminals on the same subnetwork, and the multicast method is a method in which one base station transmits data to a specific group of one or more terminals. According to the multicast scheme, each terminal must transmit a desire to receive data to the network, and can join and leave a group.

An object of the present invention is to provide a method for a base station to transmit paging information to a terminal receiving an MBS.

In the paging method of the base station according to an aspect of the present invention, the step of checking whether the terminal receives a multicast / broadcast service (Multicast / Broadcast Service) and if the terminal receives the MBS, paging considering the MBS And transmitting related information to the terminal, wherein the paging related information considering the MBS includes paging offset information and paging cycle information set such that a frame in which MBS burst allocation information is transmitted matches a frame in which a paging message can be transmitted. Include.

The terminal in the idle mode may reduce the frequency of stopping the idle mode to check the MBS burst allocation information and the paging message of the base station. Therefore, power consumption of the terminal can be reduced.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In this specification, a mobile station (MS) includes a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), and a user equipment. It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a node B (Node B), an advanced node B (evolved NodeB, eNodeB), a base transceiver station (Base Transceiver Station, BTS), Mobile Multihop Relay (MMR) -BS, etc., and may include all or part of the functions of an access point, a wireless access station, a NodeB, an eNodeB, a base transceiver station, an MMR-BS, and the like. You may.

1 is a diagram illustrating an MBS scheme according to an embodiment of the present invention.

Referring to FIG. 1, the base station periodically transmits MBS burst allocation information to the terminal. For example, the MBS burst allocation information may be information about a time resource for transmitting the MBS burst for the MBS subscribed to the terminal. The terminal periodically receives the MBS burst allocation information, and receives the MBS burst for the MBS to which it subscribes using the MBS burst allocation information. For example, when the transmission period of the MBS burst allocation information of the base station is four frames, the terminal receives the MBS burst allocation information every four frames. When the terminal subscribes to MBS # 1, the terminal checks the time resource (ie, frame # 0, frame # 2) in which the MBS burst for MBS # 1 is transmitted from the MBS burst allocation information, and MBS for MBS # 1. Receive a burst.

Meanwhile, the UE in idle mode periodically wakes up at the time when the MBS burst allocation information is transmitted, receives the MBS burst allocation information, and receives a frame in which the MBS burst for the MBS to which it subscribes is transmitted. The terminal may perform downlink reception in the corresponding frame.

2 is a diagram illustrating a paging message reception operation of a terminal in an idle mode according to an embodiment of the present invention.

Referring to FIG. 2, the terminal receives paging related information from the base station before entering the idle mode. The paging related information may include paging cycle information and paging offset information. The terminal may calculate a frame number where a paging message can be transmitted from paging related information using Equation 1 below.

Frame number mod paging cycle = paging offset

For example, if the paging cycle is 8 frames and the paging offset is 2 frames, the paging message may be transmitted through some or all of frame # 2. Hereinafter, a frame in which a paging message can be transmitted is called a paging available interval. That is, frame # 2 is a paging available period, and the remaining frames except frame # 2 are non-paging available period.

When the UE enters the idle mode, the UE does not perform uplink transmission or downlink reception during the paging unavailable period, and performs downlink reception only during the paging available period. The UE checks whether there is a paging message by performing downlink reception during a paging available period.

3 is a diagram illustrating an operation of receiving MBS burst allocation information and a paging message of a terminal in an idle mode according to an embodiment of the present invention.

Referring to FIG. 3, the base station periodically transmits MBS burst allocation information to the terminal. The terminal in the idle mode periodically wakes up to check the MBS burst allocation information in order to receive the MBS burst for the MBS to which it is subscribed. Separately, the UE in the idle mode awakes in the paging available interval to check whether the paging message is transmitted from the base station. For example, the UE in idle mode wakes up in frame # 0 and frame # 8 to receive MBS burst allocation information, and wakes up in frame # 2 and frame # 10 to check for paging messages. The terminal in the idle mode wakes up from time to time to receive the MBS burst allocation information and paging message, thus consuming a lot of power.

4 is a diagram illustrating an operation of receiving MBS burst allocation information and a paging message of a terminal in an idle mode according to an embodiment of the present invention.

Referring to FIG. 4, when a terminal in idle mode subscribes to MBS and receives an MBS burst, the base station sets a paging cycle and a paging offset such that a frame transmitting MBS burst allocation information and a frame transmitting a paging message are the same. To inform the terminal.

The terminal may calculate a frame in which the paging message is transmitted using the paging cycle information and the paging offset information received from the base station, stop the idle mode in the calculated frame and receive the MBS burst allocation information and the paging message. Accordingly, the terminal can reduce the number of times to stop the idle mode, thereby saving power.

As another example, when the transmission period of the MBS burst allocation information is significantly shorter than the transmission period of the general paging message, the base station sets the paging cycle and paging offset so that the paging message is transmitted every integer times of the transmission period of the MBS burst allocation information terminal You can also let them know.

5 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention. It is assumed that the terminal intends to start the idle mode.

Referring to FIG. 5, the terminal transmits an idle mode start request message to the base station (S500), and the base station determines whether the terminal receives the MBS (S510).

The base station sets the paging-related information based on the result of the check in step S510, and transmits an idle mode start permission message including the paging-related information to the terminal (S520). That is, when the terminal does not receive the MBS, the base station transmits an idle mode start permission message including the paging related information not considering the MBS to the terminal. When the terminal receives the MBS, the base station transmits an idle mode start permission message including the paging-related information considering the MBS to the terminal. The paging related information considering MBS is frame offset information and frame cycle information in which the frame to which the MBS burst allocation information is transmitted and the frame to which the paging message can be transmitted are identical.

The terminal calculates a frame in which the paging message can be transmitted using the paging-related information included in the idle mode initiation permission message received in step S520 (S530), and stops the idle mode in the calculated frame to determine MBS burst allocation information and / Or receives a paging message (S540).

6 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention. It is assumed that a terminal operating in idle mode intends to initiate MBS.

Referring to FIG. 6, the terminal transmits a location registration request message including an MBS start indicator to a base station (S600). The base station checks whether the location registration request message includes the MBS start indicator (S610).

The base station sets a location registration response message based on the result of the check in step S610 and transmits the location registration response message to the terminal (S620). That is, when the location registration request message of the terminal does not include the MBS start indicator, the base station transmits a location registration response message that does not include paging-related information to the terminal. If the location registration request message of the terminal includes the MBS start indicator, the base station transmits a location registration response message containing the paging-related information considering the MBS to the terminal.

The terminal checks whether the paging-related information is included in the location registration response message received in step S620 (S630). If the paging-related information is included, a frame in which a paging message may be transmitted is calculated and stored using the paging-related information (S640). The terminal stops the idle mode in the stored frame and receives the MBS burst allocation information and / or paging message (S650). If the paging related information is not included in the location registration response message received in step S620, the terminal may stop the idle mode in a frame in which a paging message that is already stored may be transmitted.

7 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention. It is assumed that the terminal operating in the idle mode intends to terminate the MBS.

Referring to FIG. 7, the terminal transmits a location registration request message including an MBS end indicator to the base station (S700). The base station checks whether the location registration request message includes the MBS end indicator (S710).

The base station sets a location registration response message based on the result of the check in step S710 and transmits it to the terminal (S720). That is, when the location registration request message of the terminal does not include the MBS end indicator, the base station transmits a location registration response message that does not include paging-related information to the terminal. If the location registration request message of the terminal includes the MBS end indicator, the base station transmits a location registration response message containing the new paging-related information to the terminal. When the location registration request message of the terminal includes the MBS end indicator, the base station no longer needs to transmit the MBS burst allocation information and the paging message in the same frame. Accordingly, the base station may newly set a frame capable of transmitting the paging message.

The terminal checks whether the paging-related information is included in the location registration response message received in step S720 (S730). If the paging related information is included, a frame in which a paging message may be transmitted is calculated and stored using the paging related information (S740). The terminal stops the idle mode in the stored frame and receives the MBS burst allocation information and / or paging message (S750). If the paging related information is not included in the location registration response message received in step S720, the terminal may stop the idle mode in a frame in which a paging message that is already stored may be transmitted.

The embodiments of the present invention described above are not only implemented through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded. Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram illustrating an MBS scheme according to an embodiment of the present invention.

2 is a diagram illustrating a paging message reception operation of a terminal in an idle mode according to an embodiment of the present invention.

3 is a diagram illustrating an operation of receiving MBS burst allocation information and a paging message of a terminal in an idle mode according to an embodiment of the present invention.

4 is a diagram illustrating an operation of receiving MBS burst allocation information and a paging message of a terminal in an idle mode according to an embodiment of the present invention.

5 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention.

6 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention.

7 is a flowchart illustrating a paging method of a base station according to an embodiment of the present invention.

Claims (1)

Checking whether the terminal receives a multicast / broadcast service; And When the terminal receives the MBS, and transmitting the paging-related information considering the MBS to the terminal, The paging related information considering the MBS includes paging offset information and paging cycle information set such that a frame in which MBS burst allocation information is transmitted matches a frame in which a paging message can be transmitted.

Images