KR20060055216A - Method and system for transmitting/receiving paging message in a broadband wireless access system - Google Patents

Abstract

The present invention relates to a method and system for transmitting and receiving a paging message transmitted from a base station (access point: AP) of a broadband wireless access system (BWA) to a mobile station (SS). When the paging message is transmitted and received between the base station and the mobile terminal of the broadband wireless access system, the base station broadcasts the paging message with a predetermined paging CID, and if the mobile terminal receives the paging CID, the decoding of another broadcast message is omitted, And decoding the paging message. Accordingly, according to the present invention, the mobile terminal reduces power consumption to receive and interpret unnecessary broadcast messages during a paging listening interval, thereby reducing battery consumption and improving the lifetime of the mobile terminal. Can be increased.

Broadband Wireless Access System, Mobile Internet, Paging, Power Consumption, CID, Paging Message, Broadcast Message

Description

METHOD AND SYSTEM FOR TRANSMITTING / RECEIVING PAGING MESSAGE IN A BROADBAND WIRELESS ACCESS SYSTEM}             

1 is a diagram illustrating an example of a configuration of a downlink subframe in a broadband wireless access system to which the present invention is applied;

2 is a diagram illustrating a correspondence relationship between conventional broadcast messages and broadcast CID.

3 is a diagram illustrating a correspondence relationship between a paging message and a paging CID according to an embodiment of the present invention.

4 is a flowchart illustrating a procedure for transmitting and receiving a paging message between a mobile station and a base station in a broadband wireless access system according to an embodiment of the present invention.

5 is a flowchart illustrating a paging message receiving procedure performed in a mobile terminal of a broadband wireless access system according to an embodiment of the present invention.

The present invention relates to a method and system for transmitting a message in a wireless communication system. In particular, the present invention relates to a broadcast transmitted from a base station (AP) of a broadband wireless access system (BWA) to a subscriber station (SS). A method and system for sending and receiving cast messages.

In general, communication systems have been developed mainly for voice services, and are gradually developing as communication systems capable of not only voice but also data services and various multimedia services. However, since the voice-oriented communication system has a relatively small data transmission bandwidth and a high usage fee, the voice-oriented communication system cannot meet the rapidly increasing demand for users. In addition, due to the development of the communication industry and increasing user demand for Internet services, there is an increasing need for a communication system that can efficiently provide Internet services. As a result, broadband wireless access systems have been introduced to efficiently provide Internet services with broadband enough to meet the increasing demands of users.

The broadband wireless access system is a system for integrating and supporting not only voice but also various low speed and high speed data services and multimedia application services such as high definition video. The broadband wireless access system can access PSTN and PSDN networks, Internet networks, IMT-2000 networks, ATM networks, etc. in a mobile or fixed environment based on wireless media using broadband such as 2 GHz, 5 GHz, 26 GHz and 60 GHz. It is a wireless communication system that can support more than a channel rate. The broadband wireless access system may be classified into a broadband wireless subscriber network, a broadband mobile access network, and a high-speed wireless LAN according to the mobility (fixed or mobile) and communication environment (indoor or outdoor) of a terminal, and a channel rate.

The wireless access method of the broadband wireless access system is being standardized by the IEEE 802.16 standardization group of the Institute of Electrical and Electronics Engineers, one of the international standardization organizations, and is currently providing wireless broadband Internet service for mobile terminals. The IEEE 802.16e standard is being promoted as a standard.

The IEEE 802.16e standard has a wider bandwidth of data than a conventional wireless technology for voice service, and can perform large data transmission in a short time, and it is possible to efficiently use a channel by sharing all user channels. In addition, quality of service (QoS) is guaranteed so that a user can receive different quality of services according to the characteristics of the service. In the IEEE 802.16e system, all users connected to a base station share and use a common channel, and each user uses a channel and the interval is allocated by the base station in every uplink and downlink frame. Channel characteristic information and channel access information should be informed so that they can be used separately.

In the IEEE 802.16e system, channel information is classified into an uplink channel and a downlink channel, and channel characteristic information including a channel ID and a configuration change count value of each channel is converted into TLV (Type, Length, Defined as Value) to include in the Downlink Channel Descriptor (DCD), Uplink Channel Descriptor (UCD) message to inform all mobile terminals of the uplink and downlink channel characteristic information at regular intervals. In addition, the base station transmits a MAP message (UL-MAP, DL-MAP) including the uplink access information and the downlink access information at the beginning of every frame to all the second terminals in the base station.

A mobile terminal provided with a service from the base station switches to an idle mode when not transmitting or receiving actual data traffic with the base station. The transition from the active state in which the mobile terminal transmits and receives data traffic to the standby state occurs after the de-registration procedure of the mobile terminal. Briefly describing the deregistration procedure of the mobile terminal, the mobile terminal transmits a deregistration (DREG-REQ) message to the base station, and the base station deregisters by sending a deregistration command (DREG-CMD) message to the mobile terminal. After that, the mobile terminal is switched to the standby state. The mobile terminal should periodically check whether there is traffic delivered to it during the standby state.

That is, the standby state of the mobile terminal means a state in which the mobile terminal can receive a downlink broadcast message periodically without being registered in a specific base station, and the mobile terminal in the standby state can conserve power and resources necessary for operation. . In this regard, the messages transmitted in the broadcast message include the DCD message, the UCD message, and a paging (MOB-PAG-ADV) message for calling a mobile terminal.

As described above, the mobile station can only receive a downlink broadcast message from the base station when in the standby state, and the base station sends a broadcast broadcast connection ID (CID) when transmitting all broadcast messages to the mobile station in the standby state. I use it. Therefore, the base station uses the broadcast CID when transmitting a paging (MOB-PAG-ADV) message to the mobile station. However, since all broadcast messages share the broadcast CID, multiple broadcast messages can be broadcast together in one burst.

In this case, the mobile station in the standby state may cause a problem in which not only the paging message (MOB-PAG-ADV) but also all other broadcast messages such as UCD, DCD, and MOB_NBR-ADV messages which are not related to paging may be generated. Therefore, when the mobile terminal receives the paging message, it consumes unnecessary power to decode all other broadcast messages.

An object of the present invention is to provide a method and system for transmitting and receiving downlink broadcast messages in a broadband wireless access system.

Another object of the present invention is to provide a method and system for dividing and transmitting a paging message transmitted from a base station to a mobile terminal in a broadband wireless access system.

It is still another object of the present invention to provide a method and system that can reduce power consumption of a mobile terminal receiving a downlink broadcast message in a broadband wireless access system.

According to an aspect of the present invention, there is provided a method of transmitting and receiving a paging message between a base station and a mobile terminal in a broadband wireless access system, the method comprising: broadcasting the paging message together with a predetermined paging CID; And if the paging CID is received, decoding the paging message.

A system of the present invention for achieving the above object is a broadband wireless access system for broadcasting a paging message for a call, a base station for broadcasting the paging message with a predetermined paging CID and the paging message when the paging CID is received; It characterized in that it comprises a mobile terminal for decoding the.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Briefly describing the concept of the present invention prior to the description of the present invention, embodiments of the present invention to be described below are basically applied to the IEEE 802.16e system, a separate for paging (MOB-PAG-ADV) message only in IEEE 802.16e It is proposed to define a CID so as not to decode other broadcast messages when the mobile terminal in standby receives a paging message or to prevent unnecessary power consumption of the mobile terminal by preventing the active mobile terminal from decoding the paging message. will be.                     

1 is a diagram illustrating an example of a configuration of a downlink subframe in a broadband wireless access system to which the present invention is applied, which is, for example, an Orthogonal Frequency Division Multiplexing Access based on IEEE 802.16e. OFDMA ") shows a configuration of a downlink subframe broadcasted by the base station to mobile terminals.

Referring to each of the regions constituting the subframe of FIG. 1, the preamble 101 is positioned in front of the subframe in FIG. 1. This preamble 101 helps the mobile terminal to make cell decisions or synchronize system synchronization. Subsequent regions of the preamble 101 are divided into a frame control header (FCH) 103, a map (MAP) region 105, and downlink burst regions 107 to 111.

As described above, through the map area 105, various CID information including the access information for the uplink channel and the downlink channel, the broadcast CID, and the paging CID according to the present invention are transmitted in a MAP message recorded as a MAP information element. Bursts transmitted by broadcast through the downlink burst regions 107 through 111, and bursts transmitted through a general diversity channel and / or a band Adaptive Modulation Coding (AMC) channel. Are sent. To this end, the downlink burst regions 107 to 111 are a broadcast region 107 to which broadcast bursts are assigned, a diversity region 109 to which bursts of diversity channels are assigned, and bursts of band AMC channels are allocated. The band AMC region 111 may be included.                     

The diversity channel refers to a channel for transmitting data through frequency tones scattered over the entire band of the OFDMA system. Unlike the diversity channel, the band AMC channel is a frequency tone that spans the entire OFDMA band in succession to each other. It refers to a channel that constitutes a plurality of frequency bands and transmits data in units of bands, which are not related to the gist of the present invention, and a detailed description thereof will be omitted. Meanwhile, the broadcast burst includes various broadcast messages such as UCD, DCD, and MOB_NBR-ADV messages, and a paging message for calling a mobile terminal is also included in the broadcast messages.

Hereinafter, a conventional method of identifying a paging message included in broadcast messages and a method of the present invention will be described with reference to FIGS. 2 and 3 to assist in understanding the present invention.

First, FIG. 2 is a diagram illustrating a correspondence relationship between conventional broadcast messages and broadcast CID, and includes broadcast messages such as a UCD, DCD, MOB-NBR-ADV, or paging (MOB-PAG-ADV) message broadcasted by a base station. Since 220 uses the same broadcast CID 210, multiple broadcast messages 220 can be broadcast in one broadcast burst.

However, if all broadcast messages are included in one broadcast burst, as shown in FIG. You must batch decode the cast messages. Furthermore, broadcast messages such as UCD, DCD, and MOB_NBR-ADV messages have a relatively large message size, which can consume unnecessary power to decode them.

To this end, the present invention defines a CID for distinguishing other broadcast messages except for a paging message (MOB_PAG-ADV) and a separate paging CID for distinguishing only a paging message, so that the mobile terminal in the standby state receives another paging message. Broadcast messages are not decoded, and only paging messages can be decoded.

That is, FIG. 3 is a diagram illustrating a correspondence relationship between a paging message and a paging CID according to an embodiment of the present invention, and shows broadcast messages such as UCD, DCD, and MOB-NBR-ADV except for a paging message (MOB-PAG-ADV). Since 320 uses the same broadcast CID 310, multiple broadcast messages 320 may be broadcast through a base station in one broadcast burst. However, in the case of FIG. 3, the paging message (MOB-PAG-ADV) 340 of the broadcast message is transmitted in a different burst through the paging CID 330 according to the present invention, so that selective reception is possible.

In the present embodiment, for example, 0 ㅧ FFFF is set as the value of the broadcast CID 310, and 0 ㅧ FFEF is set as the value of the paging CID 330. In addition, Table 1 below summarizes the CID list required for transmitting various messages including the paging CID.                     

When using a separate paging CID as shown in Table 1, the broadcast burst broadcast by the base station is a general broadcast burst using a broadcast CID having a value of 0xFFFF and a burst for a paging message using a paging CID having a value of 0xFFEF. Divided by.

Hereinafter, a paging message transmission and reception method according to the present invention will be described with reference to FIGS. 4 and 5.

4 is a flowchart illustrating a paging message transmission and reception procedure between a mobile station and a base station in a broadband wireless access system according to an embodiment of the present invention.

First, if there is no traffic transmission and reception in the active state that the mobile terminal 10 transmits and receives traffic in step 401, the mobile terminal 10 transmits a deregistration (DREG-REQ) message to the base station 20, and in step 403 20) the registration of the mobile terminal 10 is canceled by transmitting a DREG-CMD message to the mobile terminal 10. Then, in step 405, the mobile terminal 10 is switched to the standby state. And the mobile terminal 10 in the standby state periodically checks whether there is traffic delivered to it.

On the other hand, when the base station 20 broadcasts the broadcast messages including the paging message in step 407, the mobile terminal 10 in the standby state checks the CID information with reference to the in-frame MAP message in step 409, and the paging CID in the CID information. If there is, decoding of other broadcast messages such as UCD and DCD is omitted, and in step 411, the mobile terminal 10 decodes only the corresponding paging message. For this purpose, the base station 20 allocates a separate burst only for the paging message as shown in Table 1 above.

Meanwhile, the procedure of FIG. 4 describes an operation of decoding a paging message by a mobile terminal in a standby state, and the mobile terminal in an active state decodes other broadcast messages but omits decoding of the paging message. Consumption can be reduced in both standby and active states.

5 is a flowchart illustrating a paging message receiving procedure performed in a mobile terminal of a broadband wireless access system according to an embodiment of the present invention.

First, when the base station transmits the broadcast message, the mobile terminal 10 in the standby state can receive the broadcast message only during the paging listening interval. Therefore, in step 501, the mobile terminal 10 during the paging listening interval. Receives a broadcast message according to step 503. The mobile terminal 10 receiving the broadcast message in step 503 checks the CID information of the broadcast message in step 505. If the CID is a paging CID having a value of 0xFFEF, the mobile terminal 10 decodes only the paging message of the broadcast message in step 507.

In operation 509, if the MAC address is included in the paging message and includes its own MAC address, the mobile terminal 10 starts ranging with the base station 20 from the next frame in step 511. Ranging) to communicate with the base station. If the CID is a broadcast CID having a value of 0xFFFF, the mobile terminal does not decode the received broadcast message and returns to step 501 without the decoding of the received broadcast message. If the paging message does not include its MAC address, the process returns to step 501 to wait for the next paging message reception.

Therefore, according to the above operation, the mobile station in the standby state can reduce the amount of power used to decode broadcast messages irrelevant to itself. In addition, although not shown in FIG. 5, the active mobile terminal does not need to decode a paging message that is not needed by the active mobile station. However, other broadcast messages are decoded, but the paging message is omitted. Can also be reduced. In addition, the above-described operation of the present invention may be applied to other communication systems for transmitting a paging message as a broadcast message.

As described above, according to the present invention, unnecessary power consumption generated in the mobile terminal can be reduced by efficiently transmitting and receiving a paging message in a broadband wireless access system.

In addition, according to the present invention, it is possible to provide a scheme for distinguishing and decoding a paging message and other broadcast messages in a broadband wireless access system.

Claims (10)

A method of transmitting and receiving a paging message between a base station and a mobile terminal in a broadband wireless access system, Broadcasting, by the base station, the paging message together with a predetermined paging CID; And if the mobile terminal receives the paging CID, decoding the paging message. The method of claim 1, The mobile terminal receives the paging message in the standby state. The method of claim 1, The base station transmits at least one other broadcast message together with the paging message to the mobile terminal, and when the mobile terminal receives the paging CID in a standby state, the base station skips decoding of the other broadcast message. Said method. The method of claim 1, The base station transmits at least one other broadcast message to the mobile terminal together with the paging message, and the mobile terminal omits decoding of the paging message when receiving the CID of the broadcast message in an active state. Said method. The method of claim 1, The base station transmits at least one other broadcast message together with the paging message to the mobile terminal, and the paging message and the other broadcast message are transmitted in different bursts. The method of claim 1, Receiving the paging message is characterized in that the paging listening interval is made. The method of claim 1, The base station transmits at least one other broadcast message together with the paging message to the mobile terminal, and the base station sets 0xFFFF as the CID value of the broadcast message and sets 0xFFEF as the paging CID value. The method as set forth above. The method of claim 1, After the mobile terminal decodes the paging message, checking whether the paging message includes its MAC address; And performing ranging for initial setting with the base station when the MAC address is included in the MAC address. A broadband wireless access system for broadcasting a paging message for a call, A base station broadcasting the paging message together with a predetermined paging CID; And a mobile terminal for decoding the paging message when the paging CID is received. The method of claim 9, The mobile terminal receives the paging message in the standby state.

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