KR20100099035A - Method of paging in a wireless communication system - Google Patents

Abstract

PURPOSE: A paging method in a wireless communications system for reducing the power consumption of a terminal is provided to reduce overhead by paging related information by confirming whether a super frame header includes a paging indicator bitmap and a paging group ID. CONSTITUTION: A terminal transmits an SBC-REQ(Subscriber Basic Capability Request) message. A base station transmits an SBC-RSP(Subscriber Basic Capability Response) message. The terminal transmits a DREG-REQ message for entry to an idle mode(S110). The base station transmits a DREG-CMD message. The terminal receives a paging message according to a paging type flag. The terminal monitors the paging message in a paging listening section. The terminal does not monitor the paging message in an unavailable section.

Description

Paging method in wireless communication system {METHOD OF PAGING IN A WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system and, more particularly, to a paging method in a wireless communication system.

First, the idle mode and the paging group of the terminal will be described.

The broadband wireless access system supports idle mode to minimize power consumption of the terminal. In the idle mode, when the UE moves in a radio link environment composed of multiple base stations, it may be capable of receiving downlink (DL) broadcast traffic without registering with a specific base station.

During the idle mode, the UE does not need to perform a handoff procedure when the base station moves in the same paging zone. Therefore, the mobile station does not have to transmit uplink information for the handoff procedure, thereby reducing power consumption.

The paging area is an area covered by a paging group composed of a plurality of base stations, and paging refers to a function of identifying a location (eg, any base station or a switching center) of the terminal when an incoming call occurs. At this time, the paging group represents a logical group. The purpose of a paging group is to provide an adjacent coverage area that can be paged in downlink if there is traffic targeting the terminal.

The paging group may include one or more base stations, and one base station may be included in one or more paging groups. Paging groups are defined in the management system. Paging groups can use paging group-action backbone network messages. In addition, the paging controller may manage a list of UEs in idle mode by using a paging-announce message, which is one of the backbone network messages, and manage initial paging of all base stations belonging to the paging group.

When the terminal requests the base station to switch to the idle mode, the base station can transfer the terminal with its paging group ID (paging group ID) can be put into the idle mode state.

Next, a paging procedure according to the prior art will be described.

If the paging controller receives a call or packet for the terminal while the terminal is in idle mode, the paging controller transmits a paging message to all base stations in the paging group, and the base stations in the paging group that receive the paging message receive the terminal. Broadcast a paging advertisement message to the network. The terminal receives the paging advertisement message transmitted by the base station during the available interval and determines whether to transition to the normal mode or remain in the idle mode. That is, when the paging controller paged itself, the paging controller enters the normal mode and communicates with the base station.

However, even when there is no paging message transmitted to the terminal, the terminal needs to receive a paging message for each paging offset, thereby causing a waste of power.

As described above, the paging method according to the prior art has a problem that the power of the terminal is wasted.

An object of the present invention is to provide a paging method that can reduce the overhead caused by the paging-related information while reducing the power consumption of the terminal.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to achieve the above object, in a paging method in a wireless communication system according to an aspect of the present invention, a terminal receives a paging type flag indicating whether a super frame header includes a paging group ID and a paging indicator bitmap from a base station. Receive a paging message offset from the base station and receive a paging message at the paging message offset according to the paging type flag.

Here, when the paging type flag indicates that the super frame header includes a paging group ID and a paging indicator bitmap, the terminal may obtain a paging indicator bitmap by decoding the super frame header.

When the paging indicator bitmap indicates that a paging message is to be included in the paging message offset, the terminal may decode a paging message at the paging message offset, and the paging indicator bitmap includes a paging message at the paging message offset. If not instructing that the terminal may not decode the paging message at the paging message offset.

In addition, when the paging type flag indicates that the super frame header does not include a paging group ID and a paging indicator bitmap, the terminal decodes a paging message at the paging message offset.

In addition, the paging type flag may be transmitted from the base station to the terminal through a deregistration command (DREG-CMD) message or a subscriber basic capability response (SBC-RSP) message.

In order to achieve the above object, in a paging method in a wireless communication system according to another aspect of the present invention, a base station transmits a paging type flag indicating whether a super frame header includes a paging group ID and a paging indicator bitmap to the terminal. The mobile station transmits a paging offset and a paging message offset to the terminal and transmits a paging message according to the paging type flag.

Here, when the paging type flag indicates that the super frame header includes a paging group ID and a paging indicator bitmap, the base station includes a paging group ID and a paging indicator bitmap in the super frame header transmitted at the paging offset. It can transmit to the terminal.

In addition, the paging indicator bitmap may indicate whether each frame of the super frame transmitted at the paging offset includes a paging message.

According to embodiments of the present invention by using the paging type flag to inform the terminal whether the super frame header includes a paging group ID and paging indicator bitmap to reduce the power consumption of the terminal while reducing the overhead due to the paging-related information Can be reduced.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

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 addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

First, an idle state entry process and a paging process of a terminal in a wireless communication system will be described with reference to FIG. 1.

1 is a diagram illustrating an idle state entry process and a paging process of a terminal in a wireless communication system.

In idle mode, paging may be performed in units of paging groups. For example, the terminal may belong to one or multiple paging groups. A paging controller (PC) of each paging group performs paging to find a terminal when a user packet transmitted from a call or an external network to the terminal is received. In this case, the paging controller may deliver a paging message to all base stations in the paging group, and each base station that receives the paging message may perform paging by broadcasting a paging advertisement (MOB_PAG-ADV) message to the terminal.

Referring to FIG. 1, the terminal transmits a deregistration request (hereinafter referred to as a "DREG-REQ") message to a base station currently communicating in order to enter an idle mode in a normal mode (S110).

The base station receiving the deregistration request message transmits terminal information and base station information to the paging controller (S120). The terminal information may be a terminal identifier or a MAC address of the terminal, and the base station information may be a base station identifier.

The paging controller transmits paging controller related information to the base station (S130).

The base station transmits a deregistration command (hereinafter referred to as "DREG-CMD") message to the terminal in response to the deregistration request message (S140).

The DREG-CMD message may include a paging group ID, a paging offset, a paging message offset, and a paging listening interval.

The paging group ID is the ID of the paging group allocated to the base station by the base station, the paging offset (paging offset) is the point in time when the terminal monitors the paging message transmitted from the paging group, the paging listening interval is the paging transmitted by the terminal from the paging group A message monitoring interval, and a paging message offset is a time point during which a terminal receives a paging message transmitted from a paging group.

After confirming the deregistration command message, the terminal enters the idle mode. The terminal in the idle mode may receive a paging message based on the paging information received through the deregistration command message.

If a call or packet for the terminal is received by the paging controller while the terminal is in the idle mode (S150), the paging controller transmits a paging message to all base stations in the paging group (S160). Then, the base stations in the main paging group receiving the paging message broadcasts a paging advertisement (PAG-ADV) message to the terminals that it manages (S170), the terminal checks the paging advertisement message, the normal mode In step S180, communication with the base station is performed.

Next, a paging method of a terminal in a wireless communication system according to an embodiment of the present invention will be described.

According to a paging method of a terminal in a wireless communication system according to an embodiment of the present invention, the terminal first receives a paging type flag from a base station. The paging type flag indicates whether the super frame header (hereinafter referred to as "SFH") includes a paging group ID and a paging indication bitmap. In particular, the paging group ID and paging indication bitmap may be included in the SFH SP5 IE.

For example, a paging type flag of "0b00" indicates that SFH does not include a paging group ID and a paging indicator bitmap, and a paging type flag of "0b01" indicates that SFH includes a paging group ID and a paging indicator bitmap. It can represent.

The paging indicator bitmap indicates whether each frame included in the corresponding super frame includes a paging message. For example, if one super frame includes four frames, the paging indicator bitmap may be represented by 4 bits. If only the third frame includes a paging message, the paging indicator bitmap becomes '0010'.

The terminal may perform paging type flag negotiation with the base station in the basic capability negotiation process of the network entry process, or may perform paging type flag negotiation with the base station in the idle mode entry process.

The UE performs the paging type flag negotiation with the base station in the basic capability negotiation process of the network entry process with reference to FIG. 2, and performs the paging type flag negotiation with the base station in the idle mode entry process with reference to FIG. 3. Will be explained.

2 is a diagram illustrating a case in which a terminal and a base station perform paging type flag negotiation in a basic capability negotiation process, and FIG. 3 is a diagram illustrating a case in which a terminal and a base station perform paging type flag negotiation in an idle mode entry process.

2, the terminal transmits a terminal basic capability request (hereinafter referred to as "SBC-REQ") message to the base station in order to negotiate with the base station during the network entry process, the terminal basic capability from the base station Receive a subscriber basic capability response (hereinafter referred to as "SBC-RSP") message. In this case, the terminal may receive a paging type flag through the SBC-RSP message from the base station.

Thereafter, the terminal transmits a DREG-REQ message to the base station to enter the idle mode, and receives the DREG-CMD message from the base station.

The DREG-CMD message may include a paging group ID, a paging offset, a paging message offset, and a paging listening interval.

3, the terminal transmits a DREG-REQ message to the base station and receives a DREG-CMD message from the base station to enter the idle mode. In this case, the UE may receive a paging type flag through a DREG-CMD message.

Thereafter, the terminal receives the paging message according to the paging type flag.

That is, when the paging type flag indicates that the SFH includes the paging group ID and the paging indicator bitmap, the terminal decodes the SFH first during the paging listening interval to obtain the paging group ID and the paging indicator bitmap. The paging indicator bitmap determines whether there is a paging message at the paging message offset allocated by the terminal, and if there is a paging message at the paging message offset allocated by the terminal, the paging message is decoded at the paging message offset.

If the paging type flag indicates that the SFH does not include the paging group ID and the paging indicator bitmap, the terminal decodes the paging message at the allocated paging message offset.

2 and 3, the terminal entering the idle mode monitors the paging message during the paging listening interval at the paging offset, and does not monitor the paging message during the unavailable interval. The paging listening interval is also called an available interval. The paging listening section and the language balable section are called paging cycles. 2 and 3, the paging listening section includes one super frame, and the language bailable section includes N super frames.

2 and 3, the paging message offset is the third frame of the super frame. Therefore, when the paging type flag received by the UE indicates that the SFH includes the paging group ID and the paging indicator bitmap, the SFH will include the paging group ID and the paging indicator bitmap. Check the paging group ID and paging indicator bitmap. The terminal determines whether the third super frame, which is the paging message offset of the terminal, includes the paging message through the paging indicator bitmap.

For example, if the paging indicator bitmap is "0010", it means that the third frame includes the paging message and thus the terminal decodes the paging message at the paging message offset. If the paging message offset received by the UE through the DREG-CMD message is 3 and the paging indicator bitmap is "0001", it means that the third frame does not include the paging message and thus the terminal does not decode the paging message at the paging message offset. .

If the paging type flag indicates that the SFH does not include the paging group ID and the paging indicator bitmap, the SFH does not include the paging group ID and the paging indicator bitmap. Accordingly, the terminal decodes the paging message by receiving the paging group ID and the paging message at the paging message offset.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, the method of updating a location according to an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and programmable logic (PLDs). devices), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, the location update method according to an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.

1 is a diagram illustrating an idle state entry process and a paging process of a terminal in a wireless communication system.

2 is a diagram illustrating a case in which a terminal and a base station perform paging type flag negotiation in a basic capability negotiation process.

3 is a diagram illustrating a case in which a terminal and a base station negotiate a paging type flag during an idle mode entry process.

Claims (12)

In the paging method of the terminal in a wireless communication system, Receiving a paging type flag from the base station indicating whether the super frame header includes a paging group ID and a paging indicator bitmap; Receiving a paging message offset from the base station; And And receiving a paging message at the paging message offset according to the paging type flag. The method of claim 1, If the paging type flag indicates that the super frame header includes a paging group ID and a paging indicator bitmap, receiving the paging message includes decoding the super frame header to obtain a paging indicator bitmap Way. The method of claim 2, Receiving the paging message If the paging indicator bitmap indicates that a paging message is to be included in the paging message offset, decoding the paging message at the paging message offset. The method of claim 2, Receiving the paging message If the paging indicator bitmap indicates that the paging message offset does not include a paging message, the paging message offset does not decode a paging message. The method of claim 1, If the paging type flag indicates that the super frame header does not include a paging group ID and a paging indicator bitmap, receiving the paging message decodes a paging message at the paging message offset. . The method of claim 1, And the paging type flag is received from the base station through a deregistration command (DREG-CMD) message. The method of claim 1, The paging type flag is received from the base station via a subscriber basic capability response (SBC-RSP) message. A paging method of a base station in a wireless communication system, Transmitting a paging type flag indicating whether the super frame header includes a paging group ID and a paging indicator bitmap to the terminal; Transmitting a paging offset and a paging message offset to the terminal; And Transmitting a paging message according to the paging type flag. The method of claim 8, If the paging type flag indicates that the super frame header includes a paging group ID and a paging indicator bitmap, including the paging group ID and the paging indicator bitmap in the super frame header transmitted at the paging offset and transmitting the same to the terminal. Paging method further comprising. 10. The method of claim 9, And the paging indicator bitmap indicates whether each frame of the super frame transmitted at the paging offset includes a paging message. The method of claim 8, The paging type flag is a paging method characterized in that it is transmitted to the terminal via a deregistration command (DREG-CMD) message. The method of claim 8, The paging type flag is a paging method, characterized in that transmitted to the terminal via a subscriber basic capability response (SBC-RSP) message.

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