KR20060097508A - System and method for allocation and indication of ranging region in a broadband wireless access communication system - Google Patents

Abstract

The present invention relates to a broadband wireless access communication system, comprising: a ranging area allocation and a method for indicating the same, performed by a base station, the method comprising: assigning a ranging area to a first area of every downlink frame and changing information; Determining whether to include information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information; And allocating or not allocating a ranging region to the uplink frame according to the information.

Broadband Wireless Access, Ranging, Downlink Frame Predecessor, UL-MAP

Description

Ranging Area Allocation and Indication System and Method in Broadband Wireless Access Communication System {SYSTEM AND METHOD FOR ALLOCATION AND INDICATION OF RANGING REGION IN A BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM}

1 is a diagram schematically illustrating a structure of a general IEEE 802.16 communication system

2 schematically illustrates a frame structure of an OFDMA communication system

3 schematically illustrates a downlink frame structure of a broadband wireless access communication system using an OFDM / OFDMA scheme;

4 schematically illustrates an uplink frame structure of a broadband wireless access communication system using an OFDM / OFDMA scheme.

5 is a diagram schematically illustrating a ranging procedure of a broadband wireless access communication system using an OFDM / OFDMA scheme;

6 is a diagram illustrating a frame structure for explaining an example of a ranging area allocation and an indication method thereof according to an embodiment of the present invention;

7A and 7B are flowcharts illustrating a process of allocating and indicating an initial ranging region and a bandwidth request / periodic ranging region according to an embodiment of the present invention.

8A through 8C are flowcharts illustrating a ranging area recognition and a ranging process according to the mobile subscriber station according to an embodiment of the present invention.

The present invention relates to a broadband wireless access communication system, and more particularly, to a system and method for ranging area allocation and indication in a broadband wireless access communication system using an orthogonal frequency division multiplexing scheme.

In the 4th Generation (hereinafter, referred to as '4G') communication system, users of services having various quality of service (hereinafter referred to as 'QoS') having a transmission rate of about 100 Mbps are used. Active research is underway to provide them. Currently, 3rd Generation (hereinafter, referred to as '3G') communication system generally supports a transmission rate of about 384 Kbps in an outdoor channel environment having a relatively poor channel environment, and even in an indoor channel environment having a relatively good channel environment. It supports up to 2Mbps transfer rate.

Currently, wireless local area network (hereinafter referred to as "LAN") systems and wireless metropolitan area network (hereinafter referred to as "MAN") systems generally have transmission rates of 20 Mbps to 50 Mbps. Support. However, the wireless LAN system and the wireless MAN system that guarantee a relatively high transmission rate do not satisfactorily guarantee mobility and various quality of service (hereinafter referred to as 'QoS'). Research into the evolution of 4th generation (hereinafter referred to as '4G') communication system, which is a next-generation communication system that guarantees security, is being actively conducted.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16 communication system is a system that performs a ranging (ranging) operation between the subscriber station and the base station (Base Station). Rangings used in the IEEE 802.16 communication system include initial ranging and maintenance ranging (ie, periodic ranging) and bandwidth request ranging. do.

First, initial ranging will be described.

The initial ranging is performed when the base station requests the base station for synchronization acquisition between the base station and the subscriber station, and the initial ranging sets a correct time offset between the MSS and the base station and transmit power. Range is performed to adjust). That is, the MSS receives information broadcast from a base station such as a DL_MAP message, a UL-MAP message, and a UCD message after powering on, acquires synchronization with a base station, and then adjusts the time offset and transmission power with the base station. Perform initial ranging.

Second, periodic ranging will be described.

The periodic ranging is a ranging periodically performed by the MSS adjusting the time offset and the transmission power with the base station through the initial ranging to adjust the channel state with the base station.

Third, the band request ranging will be described.

The band request ranging is a ranging in which an MSS that adjusts a time offset and a transmission power with a base station through the initial ranging requests a bandwidth allocation in order to perform actual communication with the base station.

Next, a communication system structure considered in the IEEE 802.16 communication system according to the prior art will be described with reference to FIG. 1.

1 is a diagram schematically illustrating a structure of a general IEEE 802.16 communication system.

Before explaining FIG. 1, the wireless MAN system is a broadband wireless access (BWA) communication system, which has a wider service area and supports higher transmission speed than the wireless LAN system. Orthogonal Frequency Division Multiplexing (OFDM) scheme and Orthogonal Frequency Division Multiple Access (Orthogonal) scheme to support a broadband transmission network in a physical channel of the wireless MAN system A system employing Frequency Division Multiple Access (hereinafter referred to as "OFDMA") scheme is the IEEE 802.16 communication system. That is, the IEEE 802.16 communication system is a broadband wireless access communication system using the OFDM / OFDMA scheme.

Since the IEEE 802.16 communication system applies the OFDM / OFDMA scheme to the wireless MAN system, high-speed data transmission is possible by transmitting a physical channel signal using a plurality of sub-carriers.

Referring to FIG. 1, the IEEE 802.16 communication system has a multi-cell structure, that is, a base station (110) that has a cell 100 and a cell 150, and manages the cell 100, and the cell. Base station 140 that manages 150 and a plurality of mobile subscriber stations (hereinafter referred to as 'MSS') 111, 113, 130, 151, and 153 It is composed of In addition, signal transmission and reception between the base stations 110 and 140 and the MSSs 111, 113, 130, 151, and 153 is performed using the OFDM / OFDMA scheme.

Meanwhile, the OFDMA scheme is a two-dimensional access method combining time division access (hereinafter referred to as 'TDA') and frequency division access (hereinafter referred to as 'FDA') technology. Can be defined Accordingly, in transmitting data using the OFDMA scheme, each OFDMA symbol is divided into subcarriers and transmitted through predetermined sub-channels. The subchannel refers to a channel composed of a plurality of subcarriers, and is a preset number of subcarriers according to a system situation in a communication system using the OFDMA scheme (hereinafter referred to as an 'OFDMA communication system'). These constitute one subchannel. Next, a frame structure of the OFDMA communication system will be described with reference to FIG. 2.

2 is a diagram schematically illustrating a frame structure of an OFDMA communication system.

Referring to FIG. 2, the horizontal axis represents an OFDMA symbol number and the vertical axis represents a sub-channel number. One OFDMA frame consists of a plurality (eg, eight) OFDMA symbols. In addition, the one OFDMA symbol is composed of a plurality of (eg N) sub-channels. Each ranging frame has a ranging channel, and the ranging channel includes a plurality of ranging slots. The ranging channel includes one or more subchannels, and the number of subchannels constituting the ranging channel is included in an UL (UpLink) -MAP message.

Reference numeral 201 denotes a ranging region, that is, ranging slots, present in the M-th frame, and reference numeral 202 denotes ranging slots present in the M + 1th frame. On the other hand, a ranging slot for sending a ranging signal exists only during an uplink time interval. Information indicating whether the ranging slot is present during an uplink time interval is also included in the UL-MAP message. In other words, the UL-MAP message broadcast every frame includes information on whether the ranging slot is present or not. Accordingly, the ranging slot may or may not be included in each frame. It may mean that. This will be described later in detail.

FIG. 3 is a diagram schematically illustrating a downlink frame structure of a broadband wireless access communication system using an OFDM / OFDMA scheme. In particular, FIG. 3 schematically illustrates a downlink frame structure of the IEEE 802.16a and IEEE 802.16e communication systems. .

Referring to FIG. 3, the downlink frame is referred to as a preamble region 300, a broadcast control region 310, and a plurality of time division multiplexing (hereinafter, 'TDM'). ) Regions 320 and 330. Through the preamble area 300, a synchronization signal for acquiring mutual synchronization between the base station and the MSS, that is, a preamble sequence, is transmitted.

The broadcast control region 310 includes a frame control header (FCH) region 315, a DL (DownLink) _MAP region 311, and an UL (UpLink) _MAP region 312. It is composed. In this case, the FCH region is a region in which downlink frame prefix (DLFP) information is transmitted. Table 1 shows the DLFP format.

As shown in Table 1, the DLFP is a subchannel used in a plurality of information elements (hereinafter, referred to as 'IE'), that is, a partial usage subchannel zone of a downlink frame. Used Subchannel bitmap, which indicates the number of groups of N, Ranging Change Indication indicating the allocation change of the ranging area for periodic ranging or bandwidth request of MSS compared to the previous frame, and used for the DL_MAP. A Repetition Coding Indication indicating a repetitive coding indication, a Coding Indication indicating a modulation and coding method used for the DL_MAP transmission, and a DL-MAP Length indicating a length of the DL_MAP.

The DL_MAP area 311 is an area in which a DL_MAP message is transmitted. IEs included in the DL_MAP message are shown in Table 2 below.

As shown in Table 2, the DL_MAP message includes a plurality of IEs, that is, a Management Message Type indicating a type of a transmitted message, a PHY (corresponding to a modulation scheme and a demodulation scheme applied to a physical channel to obtain synchronization). A count corresponding to a configuration change of a Downlink Channel Descriptor (hereinafter referred to as a 'DCD') message including a PHYsical Synchronization and a Downlink Burst Profile. DCD count, a base station ID indicating a base station identifier (Base Station Identifier) and a Number of DL_MAP Elements n indicating the number of elements that exist after the base station ID.

In addition, the UL-MAP area 313 is an area in which a UL-MAP message is transmitted, and IEs included in the UL-MAP message are shown in Table 3 below.

As shown in Table 3, the UL-MAP message includes a plurality of IEs, that is, a management message type indicating a type of a transmitted message, an uplink channel ID indicating an uplink channel ID used, and an uplink burst. Data Burst constituting a downlink frame and a UCD count indicating a count corresponding to a configuration change of an Uplink Channel Descript (hereinafter referred to as 'UCD') message containing a profile. And a plurality of UL-MAP IEs that refer to the size / location / characteristic of. Here, the uplink channel identifier is uniquely assigned in the Media Access Control (hereinafter referred to as 'MAC')-sublayer.

The format of the UL-MAP information element is shown in Table 4 below.

As shown in Table 4, the UL-MAP IE has a connection ID indicating an MSS using an uplink data burst, and an Uplink Interval Usage Code for identifying the type of UL-MAP IE. (Hereinafter referred to as 'UIUC') and different IEs corresponding to the UIUC values. For example, when UIUC = 12, the MSS is used for indicating resource allocation information necessary for ranging to a base station, that is, location, size, and attribute of an uplink frame. In other words, the UL-MAP IE having UIUC = 12 indicates the OFDMA Symbol offset (represents the distance in OFDMA Symbol units away from the beginning of the frame) and Subchannel Offset (Subchannel Index unit away from Subchannel 0) in Table 4 above. Denotes the starting point of the ranging region. In addition, ranging resource allocation information is shown from the starting point by using No.OFDMA symbols (number of symbols in the data burst) and No.Subchannel (number of subchannel indexes). In addition, it indicates whether the ranging region allocated using the Ranging Method is for Initial Ranging or for bandwidth request or periodic ranging.

As described above, the UL-MAP message includes two ranging regions, that is, a ranging region for initial ranging (Ranging Method = 0b00 or 0b01), and a ranging region for periodic ranging / bandwidth request. = 0b10 or 0b11). In addition, the UL-MAP message may not include the UL-MAP IE with UIUC = 12. In this case, the MSS does not attempt ranging in the uplink frame not including the UL-MAP IE with the UIUC = 12, and then performs the ranging in the uplink frame including the UL-MAP IE with the UIUC = 12. You can do it.

Meanwhile, UL-MAP IEs having UIUC = 1 to UIUC = 11 are data bursts used for a fast-feedback channel, for data transmission of an MSS, for indicating an end of an UL-MAP region, and the like. (Duration in OFDMA slot) and Repetition coding Indication used. UL-MAP IEs having UIUC = 1 to UIUC = 11 are referred to as uplink channel descriptions (UCDs), which indicate modulation, coding method, and physical characteristics for respective bursts. One-to-one mapping with messages. That is, the UCD message includes an uplink burst profile. Therefore, the MSS must know the UCD information before receiving the UL-MAP message and decoding it.

In addition, if the MSS does not successfully perform ranging, a random backoff value is set to increase the probability of success in the next attempt, and the ranging attempt is performed again after delaying the backoff time. In this case, information necessary to determine the backoff value is also included in the UCD message shown in Table 5 below.

As shown in Table 5, the UCD message includes a plurality of IEs, that is, a management message type indicating a type of a transmitted message, an uplink channel ID indicating an uplink channel identifier used, a configuration change count counted by a base station, and an uplink Ranging indicating the mini-slot size, which represents the mini-slot size of the physical channel, the starting point of the backoff for initial ranging (i.e., the size of the initial backoff window for the initial ranging) Backoff Start, Ranging Backoff End indicating the end point of the backoff for the initial ranging (i.e., the final backoff window size), start point of the backoff for the contention data and requests (i.e., the initial backoff window). Request B, which indicates the end point of the backoff for the Backoff Start and contention data and requests (that is, the size of the last backoff window). Contains an ackoff End.

In addition, the TDM regions 320 and 330 correspond to time slots allocated in a TDM / Time Division Multiple Access (hereinafter, referred to as TDMA) scheme for each MSS. Areas. The base station transmits broadcast information to be broadcasted to MSSs managed by the base station through a DL_MAP region 311 of a downlink frame using a preset center carrier.

The MSSs monitor all frequency bands preset in each of the subscriber stations as they are powered on, so that they have the highest size, i.e., the highest carrier to interference and noise ratio; A pilot channel signal having a " CINR " hereinafter) is detected. In addition, the base station transmitting the pilot channel signal having the strongest pilot CINR is determined to be the base station to which the subscriber station is currently belonging, and the DL_MAP region 311 and the UL-MAP region 313 of the downlink frame transmitted by the base station. ) To know control information for controlling its uplink and downlink and information indicating actual data transmission / reception positions.

FIG. 4 schematically illustrates an uplink frame structure of a broadband wireless access communication system using an OFDM / OFDMA scheme, and in particular, illustrates an uplink frame structure of an IEEE 802.16a / IEEE 802.16e communication system. .

Referring to FIG. 4, the uplink frame includes an Initial Maintenance Opportunities area 400 for initial ranging, a Request Contention Opportunities area 410 for maintenance ranging, that is, periodic ranging and bandwidth request ranging. SS scheduled data regions 420 including uplink data of subscriber stations.

The Initial Maintenance Opportunities area 400 has a UL-MAP IE with UIUC = 12 and Ranging Method = 0b00 or 0b01. The Request Contention Opportunities area 410 has a UL-MAP IE with UIUC = 12 and Ranging Method = 0b10 or 0b11 similar to the initial ranging area. The Initial Maintenance Opportunities area 400 and Request Contention Opportunities area 410 may exist together in one uplink frame, and a base station may allocate the areas 400 and 410 to frames according to a specific situation. May not be assigned. In addition, the ranging regions 400 and 410 may be allocated to any region of the uplink frame by an UL-MAP IE in any size.

The Initial Maintenance Opportunities area 400 includes a plurality of access burst sections including actual initial ranging and periodic ranging, and a collision section in case of collision between the plurality of access burst sections. do.

The Request Contention Opportunities area 410 includes a plurality of bandwidth request intervals including actual bandwidth request ranging and a collision interval when collisions between the plurality of bandwidth request intervals occur.

In addition, the SS scheduled data areas 420 include a plurality of SS scheduled data areas (SS 1 scheduled data area to SS N scheduled data areas), and the plurality of SS scheduled data areas (SS 1 scheduled data area to SS). SS N scheduled data areas are allocated to the remaining areas except for the areas 400 and 410 after the Initial Maintenance Opportunities area 400 or the Request Contention Opportunities area 410 is allocated in the uplink frame. . Because the SS scheduled data area is allocated by the UL-MAP IE with UIUC = 1 to UIUC = 11, as described in Table 4, the size of the SS scheduled data area is determined by the data burst of the UL-MAP IE. This is because the size is determined by the duration of the OFDMA slot.

As described above, the information on the SS scheduled data area includes only the size information of the SS scheduled data area by UL-MAP IE. Accordingly, the MSS should check whether a UL-MAP IE having a UIUC = 12 indicating the Initial Maintenance Opportunities area 400 or the Request Contention Opportunities area 410 exists in a UL-MAP message. If the UL-MAP IE having the UIUC = 12 exists in the UL-MAP message, the MSS recognizes the ranging regions allocated by the UL-MAP IE and then the ranging region in an uplink frame. We recognize the SS scheduled data area allocated in order from the remaining areas.

However, if the UL-MAP IE with UIUC = 12 does not exist in the UL-MAP message, the MSS recognizes that there are no ranging regions allocated by the UL-MAP IE. Accordingly, the MSS recognizes that data has been allocated in sequence by the size of the data burst (Duration in OFDMA slot unit) from the start of the entire uplink frame.

5 is a diagram schematically illustrating a communication procedure of a broadband wireless access communication system.

Referring to FIG. 5, first, as the MSS 520 is powered on, the MSS 520 monitors all frequency bands preset in the MSS 520 so that the highest size, that is, the highest pilot carrier vs. A pilot channel signal having an interference noise ratio (CNIR) is detected. The MSS 520 determines the base station 500 that has transmitted the pilot channel signal having the strongest pilot CINR as the base station 500 to which the MSS 520 itself belongs, and transmits the data from the base station 500. Receiving a preamble of a downlink frame to obtain a system synchronization with the base station 500.

As described above, when system synchronization is acquired between the MSS 520 and the base station 500, the base station 500 transmits a DL_MAP message and an UL-MAP message to the MSS 520 (steps 511 and 513). step). Here, the DL_MAP message is a physical channel capable of receiving information necessary for the MSS 520 to acquire synchronization with respect to the base station 500 on a forward link and messages transmitted to the MSS on the forward link through the DL_MAP message. This message informs the MSS 520 of the structure and the like. In addition, the UL-MAP message is a message for informing the MSS of information such as scheduling period of the MSS and structure of the physical channel in the reverse link.

Meanwhile, when the MSS 520 performs ranging to the base station 500, the MSS 520 transmits a ranging code to the base station 500 (step 515), and the base station 500 that receives the ranging code is In operation 517, a ranging response (RNG-RSP) message is transmitted to the MSS 520. In this case, the MSS 520 may transmit a ranging request message instead of the ranging code. However, when ranging is performed using the ranging request message, ranging collision confirmation between MSSs may be higher than that of the ranging code transmission. Therefore, in the IEEE802.16a and IEEE 802.16e systems using the OFDMA scheme, a ranging code is transmitted in a dedicated section for ranging so as to efficiently perform ranging, particularly initial ranging, to prevent the collision in advance. Use the way.

The ranging region described above is allocated by the UL-MAP IE having UIUC = 12 in the UL-MAP message. The MSS can know the location and size of the ranging region in the uplink frame by receiving the UL-MAP IE. Here, the ranging region may be allocated to every uplink frame, and the position or size of the ranging region occupied in the uplink frame is not changed frequently. Nevertheless, after receiving the downlink frame, the MSS always sets the UIUC = in the UL-MAP message even when the Ranging_Change_Indication field value of the DLFP information is 0, that is, no change in the location or size of the ranging region. The UL-MAP IE with 12 MUST be identified. As such, it is overhead that the UL-MAP IE having UIUC = 12 is included in the UL-MAP message of every downlink frame. For example, in the case of a message broadcasted by the base station to the MSS, the smaller the size of the message is, the more data burst area in which actual data can be transmitted can be secured and the bandwidth transmission efficiency is increased.

In addition, the base station applies the most robust modulation and coding scheme to the broadcast message to transmit broadcasting messages, such as UL-MAP or DL-MAP messages, to the MSS far from the base station. This is a limitation on the amount of real data that can be transmitted since the method of applying the modulation and coding scheme has a higher ratio of overhead than actual data.

Accordingly, an object of the present invention is to provide a system and method for allocating a ranging area for reducing system overhead in a broadband wireless access communication system.

Another object of the present invention is to provide a system and method for indicating a ranging area allocated for reducing system overhead in a broadband wireless access communication system.

The first method of the present invention for achieving the above objects; In a broadband wireless access communication system, a ranging area allocation and a method of indicating the same, performed by a base station, comprising: whether a ranging area is allocated to a first area of every downlink frame and whether or not change information is included; Determining whether to include information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether or not to change information, and upwardly corresponding to whether the ranging region is allocated and whether the change information is included; And allocating or not allocating a ranging region to the link frame.

A second method of the present invention for achieving the above objects; A ranging method performed by a mobile subscriber station in a broadband wireless access communication system, the method comprising: receiving a ranging area allocation and change information included in a first area of every downlink frame; And determining whether to read information necessary for performing ranging in a broadcast message broadcast through the second region of every downlink frame corresponding to the changed information, and the ranging region of the uplink frame according to the read result. And a process of performing ranging through the recognized ranging region.

The third method of the present invention for achieving the above objects; In a broadband wireless access communication system, a ranging area allocation and ranging method performed between a base station and a mobile subscriber station, wherein the base station includes information on whether a ranging area is allocated to a first area of every downlink frame and whether information is changed. And determining, by the base station, whether to include information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information. Not allocating or allocating a ranging region to an uplink frame according to whether the allocation area is allocated and changing information; transmitting, by the base station, the downlink frame to the mobile subscriber station; Whether or not to allocate ranging region included in the first region of a downlink frame And determining whether to read information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information. And recognizing a ranging area of an uplink frame according to the read result by the mobile subscriber station and performing a ranging through the recognized ranging area by the mobile subscriber station. It is characterized by.

The system of the present invention for achieving the above objects; In a broadband wireless access communication system, a ranging area allocation and ranging performing system performed between a base station and a mobile subscriber station, the ranging area allocation and change information is included in a first area of every downlink frame, and the lane Determining whether to include information necessary for performing ranging in a broadcast message broadcasted through a second area of every downlink frame and corresponding to the ranging area allocation and the change information. The base station for transmitting the downlink frame to the mobile subscriber station without assigning or allocating a ranging area to the uplink frame; and a ranging area allocation included in the first area of every downlink frame from the base station. Receiving status information and change information, and corresponding to the ranging region allocation information and change information To determine whether to read the information necessary to perform the ranging in the broadcast message broadcast through the second region of each downlink frame, and to recognize the ranging region of the uplink frame corresponding to the read result result, And a mobile subscriber station performing ranging through a ranging region.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted without departing from the scope of the present invention.

According to the present invention, an uplink map (hereinafter, referred to as 'UL-MAP') message size in a communication system using an Orthogonal Frequency Division Multiple Access (hereinafter, referred to as 'OFDMA') scheme. Suggest ways to reduce it. Hereinafter, in the first embodiment, the second embodiment, and the third embodiment, the base station uses an uplink interval use code (UL) of the UL-MAP information element (hereinafter, referred to as 'IE') in the UL-MAP message. An UL-MAP IE having an Uplink Interval Usage Code, hereinafter referred to as 'UIUC', having a value of 12 (ie, UIUC = 12) may be deleted from the UL-MAP message and transmitted to the mobile subscriber station. Of course, as shown in Table 4, the UL-MAP IE may be included in the UL-MAP message and transmitted as in the past.

First embodiment

Even when the base station transmits a UL-MAP message that does not include a UL-MAP IE having UIUC = 12, and the mobile subscriber station receives the UL-MAP message, the mobile subscriber station is in a lane. It should be possible to perform the gong operation. Accordingly, in the present invention, even when the base station transmits a UL-MAP message that does not include the UL-MAP IE having UIUC = 12, the downlink frame predecessor of the downlink frame can perform the ranging operation. Frame Prefix, hereinafter referred to as 'DLFP').

(1) Downlink Frame Prefix (DLFP)

The DLFP is information transmitted through a frame control header (hereinafter, referred to as an "FCH") region. DLFP proposed in the present invention is shown in Table 6.

As shown in Table 6, the DLFP proposed by the present invention initially adds 4 bits, which were reserved in the conventional DLFP format as shown in Table 1, to be newly added in the present invention. UL-MAP IE Existence for Initial Ranging field to indicate whether a region exists, Allocation or Change for Initial Ranging field to indicate allocation or change of an initial ranging region, and bandwidth requirement / periodic ranging region. 1 bit each is used for the UL-MAP IE Existence for BW Request / Periodic Ranging field for indicating and the Allocation or Change for BW Request / Periodic Ranging field for indicating the allocation or change of the bandwidth / periodic ranging region. In addition, in the conventional DLFP format, one bit of the Ranging_Change_Indication field is replaced with a spare one bit.

Next, four fields newly added in the DLFP format will be described in detail.

1. UL-MAP IE Existence for Initial Ranging : A field indicating whether a UL-MAP IE that defines an initial ranging region exists in the UL-MAP message. If the value is '0', an initial lane in the UL-MAP message. This means that there is no UL-MAP IE for the ranging region. If the value is '1', it means that the UL-MAP IE for the initial ranging region exists in the UL-MAP message.

2. Allocation or Change for Initial Ranging : The use used depends on the UL-MAP IE Existence for Initial Ranging value. That is, when the UL-MAP IE Existence for Initial Ranging value is '0' and '1', the meanings of '0' and '1' values of the Allocation or Change for Initial Ranging may be distinguished.

First, when the UL-MAP IE Existence for Initial Ranging value is '0', the value of Allocation or Change for Initial Ranging indicates whether the initial ranging region is allocated to an uplink frame. That is, when the Allocation or Change for Initial Ranging value is '0', it means that an initial ranging region is not allocated in the uplink frame. If the value is '1', the initial ranging region is initially set in the uplink frame. It means that the ranging area is allocated.

Meanwhile, when the UL-MAP IE Existence for Initial Ranging value is '1', the Allocation or Change for Initial Ranging value is initially ranging between an initial ranging region of an uplink frame of a previous time point and an uplink frame of a current time point. Indicates whether there is a change in the position or size of the area. That is, when the Allocation or Change for Initial Ranging value is '0', the position or size of the initial ranging region existing in the uplink frame of the current view is the position of the initial ranging region existing in the uplink frame of the previous view and Means no difference in size.

As described above, when the UL-MAP IE Existence for Initial Ranging value is '1' and the Allocation or Change for Initial Ranging value is '0', the mobile subscriber station attempting initial ranging is UIUC = 12, Ranging Method = 0b00 or initial ranging may be attempted by receiving a UL-MAP message including a UL-MAP IE having 0b01. In addition, since the mobile subscriber station which has already completed the initial ranging already knows the initial ranging region information, the mobile terminal reads the value of '0' of the Allocation or Change for Initial Ranging field of the DLFP field and UIUC = 12, Ranging Method = 0b00. It will be appreciated that it is not necessary to decode the UL-MAP IE having 0b01. Accordingly, the mobile subscriber station can reduce the load due to signal processing compared to conventionally unconditionally decoding the UL-MAP IE.

Meanwhile, when the Allocation or Change for Initial Ranging value is '1', it means that the location or size of the initial ranging region has changed. Therefore, all mobile subscriber stations decode the UL-MAP IE to update new initial ranging area information.

3. UL-MAP IE Existence for BW Request / Periodic Ranging : Has a meaning similar to the UL-MAP IE Existence for Initial Ranging field. However, if the UL-MAP IE Existence for Initial Ranging field is for initial ranging, the UL-MAP IE Existence for BW Request / Periodic Ranging field is a field for bandwidth request / periodic ranging. to be.

That is, the UL-MAP IE Existence for BW Request / Periodic Ranging field is a field indicating whether a UL-MAP IE that defines a bandwidth request / periodic ranging region exists in the UL-MAP message and has a value of '0'. In case the UL-MAP IE does not exist for the bandwidth request / periodic ranging region in the UL-MAP message. If the value is '1', the UL for the bandwidth request / periodic ranging region exists in the UL-MAP message. -MAP IE is present.

4. Allocation or Change for BW Request / Periodic Ranging : Has a similar meaning to the Allocation or Change for Initial Ranging field. However, if the Allocation or Change for Initial Ranging field is for initial ranging, the Allocation or Change for BW Request / Periodic Ranging field is a field for BandWidth Request / periodic ranging.

That is, when the Allocation or Change for BW Request / Periodic Ranging field has a UL-MAP IE Existence for BW Request / Periodic Ranging value of '0', the value of Allocation or Change for BW Request / Periodic Ranging is set to an uplink frame. Indicates whether the bandwidth request / periodic ranging region is allocated. That is, when the Allocation or Change for BW Request / Periodic Ranging value is '0', it means that a bandwidth request / periodic ranging region is not allocated in the uplink frame. When the value is '1', This means that a bandwidth request / periodic ranging region is allocated in the uplink frame.

Meanwhile, when the UL-MAP IE Existence for BW Request / Periodic Ranging value is '1', the Allocation or Change for BW Request / Periodic Ranging value corresponds to the bandwidth request / periodic ranging region of the uplink frame at the previous time and the current Indicates whether or not the location or size of the bandwidth request / periodic ranging region is changed between uplink frames at a time point. That is, when the Allocation or Change for BW Request / Periodic Ranging value is '0', the bandwidth or the location or size of the bandwidth request / periodic ranging region present in the uplink frame at the current time is the bandwidth in the uplink frame at the previous time. This means that there is no difference between the position and the size of the request / periodic ranging region.

As described above, when the UL-MAP IE Existence for BW Request / Periodic Ranging value is '1' and the Allocation or Change for BW Request / Periodic Ranging value is '0', the mobile subscriber station attempting bandwidth request / periodic ranging A UE may attempt bandwidth request / periodic ranging by receiving a UL-MAP message including a UL-MAP IE having the UIUC = 12 and Ranging Method = 0b10 or 0b11. Since the mobile subscriber station that has already completed the bandwidth request / periodic ranging already knows the bandwidth request / periodic ranging region information, the mobile subscriber station reads the value '0' of the Allocation or Change for BW Request / Periodic Ranging field of the DLFP field. It is recognized that the UL-MAP IE having UIUC = 12 and Ranging Method = 0b10 or 0b11 need not be decoded. Accordingly, the mobile subscriber station can reduce the load due to signal processing compared to conventionally unconditionally decoding the UL-MAP IE.

Meanwhile, when the Allocation or Change for BW Request / Periodic Ranging value is '1', it means that the location or size of the bandwidth request / periodic ranging region is changed. Therefore, all mobile subscriber stations decode the UL-MAP IE for update of new bandwidth request / periodic ranging region information.

As described above, according to the present invention, even if the UL-MAP message broadcasted every frame does not include information on the initial ranging region or the periodic ranging / bandwidth request ranging region, the mobile subscriber station can request the initial ranging or bandwidth request / Periodic ranging can be performed. Accordingly, the base station can increase the data transmission efficiency by efficiently managing the UL-MAP IE region that occupies a portion of the UL-MAP region in the downlink link frame.

Meanwhile, the ranging region allocation and the indication method as described above will be described using only the initial ranging fields. The reason is that the parameters related to the initial ranging and bandwidth request / periodic ranging have almost the same meaning between each ranging.

The initial ranging region allocation and the indication scheme can be described in all four combinations. That is, when the UL-MAP IE Existence for Initial Ranging values are '0' and '1', there are cases where the Allocation or Change for Initial Ranging values are '0' and '1', respectively. This is similar to bandwidth request / periodic ranging region allocation and its indication scheme. For example, '01' means that the UL-MAP IE Existence for Initial Ranging value is '0' and the Allocation or Change for Initial Ranging value is '1'. The meaning of each combination will be described below.

<00> : UL-MAP IE Existence for Initial Ranging value is '0', Allocation or Change for Initial Ranging value is '0'.

First, a UL-MAP IE Existence for Initial Ranging value of '0' means that a UL-MAP IE having a UIUC = 12 and a Ranging Method = 0b00 or 0b01 indicating an initial ranging region exists in a UL-MAP message. It means not to. This can be interpreted in two cases. Firstly, it means that the initial ranging region is not really allocated to the uplink frame so that no UL-MAP IE related to the initial ranging is present in the UL-MAP message. Second, although an initial ranging region is allocated to an uplink frame, a UL-MAP IE having UIUC = 12 may not be included in the UL-MAP message in order to reduce a UL-MAP message length.

To distinguish between the two cases, a bit value of an Allocation or Change for Initial Ranging field is used. That is, in case of '00', since the Allocation or Change for Initial Ranging value is '0', it means that the initial ranging region is not allocated to the uplink frame. Therefore, there is no UL-MAP IE with UIUC = 12 in the UL-MAP message, and the mobile subscriber station receiving the UL-MAP message as the first UL-MAP message cannot attempt initial ranging. .

In addition, since the mobile subscriber station receiving the UL-MAP message does not have an initial ranging region in the uplink frame, a data burst, i.e., a data burst having UIUC = 1 to UIUC = 11, is a starting point of the uplink frame. It should be noted that the allocation is done in order

<01> : UL-MAP IE Existence for Initial Ranging value is '0', Allocation or Change for Initial Ranging value is '1'.

First, since the UL-MAP IE Existence for Initial Ranging value is '0', it means that there is no UL-MAP IE having UIUC = 12 in the UL-MAP message. In addition, since the Allocation or Change for Initial Ranging value is '1', it means that an initial ranging region is allocated to an uplink frame.

As described above, among the mobile subscriber stations receiving the UL-MAP message including the UL-MAP IE having '01', initial ranging region information of the previous uplink frame is recognized, and initial ranging is also applied to the current uplink frame. The mobile subscriber station continuously attempting to recognize that the same initial ranging region as the initial ranging region of the previous frame is also allocated to the current uplink frame. Accordingly, the mobile subscriber station receiving the UL-MAP message including the UL-MAP IE having '01' performs initial ranging using the initial ranging region information already recognized without decoding the UL-MAP IE. Can be done.

Meanwhile, the mobile subscriber station receiving the UL-MAP message including the UL-MAP IE having '01' recognizes that an initial ranging region exists in an uplink frame, and has UIUC = 1 to UIUC = 11. It is recognized that data bursts have been allocated in sequence since the initial ranging.

This means that there is no UL-MAP IE in the UL-MAP message with UIUC = 12 and Ranging Method = 0b00 or 0b01 indicating the initial ranging region. This can be interpreted in two cases. Firstly, it means that the initial ranging region is not really allocated to the uplink frame so that no UL-MAP IE related to the initial ranging is present in the UL-MAP message. Second, although an initial ranging region is allocated to an uplink frame, a UL-MAP IE having UIUC = 12 may not be included in the UL-MAP message for efficiency of a UL-MAP message length.

<10> : UL-MAP IE Existence for Initial Ranging value is '1', Allocation or Change for Initial Ranging value is '0'.

First, since the UL-MAP IE Existence for Initial Ranging value is '1', it means that the UL-MAP IE having UIUC = 12 exists in the UL-MAP message. In addition, since the Allocation or Change for Initial Ranging value is '0', it means that the initial ranging region of the uplink frame is not different from the position and size of the initial ranging region of the previous uplink frame.

Meanwhile, '0' and '1' values of Allocation or Change for Initial Ranging when the UL-MAP IE Existence for Initial Ranging value is '0', and '1' when the UL-MAP IE Existence for Initial Ranging value is '1'. The meaning of '0' and '1' in Allocation or Change for Initial Ranging is different. That is, '0' and '1' of Allocation or Change for Initial Ranging when the UL-MAP IE Existence for Initial Ranging value is '0' indicates whether an initial ranging region is allocated to an uplink frame. In the case where the UL-MAP IE Existence for Initial Ranging value is '1', '0' and '1' values of Allocation or Change for Initial Ranging are the current frame in which the location or size of the initial ranging region allocated to the previous frame It is used to tell if a change was made in.

For example, as in the case of '01', it is assumed that the initial ranging region is allocated to the uplink frame while the initial ranging region information is not included in the UL-MAP message. In this state, when the mobile subscriber station attempting initial ranging receives the UL-MAP message that does not include initial ranging region information, the mobile subscriber station cannot know whether the ranging region is allocated and information about the ranging region. Accordingly, the base station periodically transmits initial ranging area information in the UL-MAP IE field of the UL-MAP message for the mobile subscriber station attempting to enter the network through the initial ranging as described above or optionally. . At this time, the bit value specified in the DLFP format is '10'.

In addition, the mobile subscriber station that is already aware of the initial ranging region information, rather than the mobile subscriber station attempting to enter the network, may recognize the initial ranging region of the previous uplink frame and the current ranging region when the DLFP indicated by '10' is recognized. It will be appreciated that the location or size of the initial ranging region of the uplink frame is the same. Thus, the mobile subscriber station does not have to decode the UL-MAP IE of the UL-MAP message.

<11> : UL-MAP IE Existence for Initial Ranging value is '1', Allocation or Change for Initial Ranging value is '1'.

First, since the UL-MAP IE Existence for Initial Ranging value is '1', it means that the UL-MAP IE having UIUC = 12 exists in the UL-MAP message. In addition, since the Allocation or Change for Initial Ranging value is also '1', it means that the position and size of the initial ranging region of the uplink frame have been changed from the position and size of the initial ranging region of the previous uplink frame. Accordingly, all mobile subscriber stations decode UL-MAP IE information in the UL-MAP message to update initial ranging information.

The combination of two parameters, DL-MAP IE Existence for BW Request / Periodic Ranging, and Allocation or Change for BW Request / Periodic Ranging, of DLFP for the periodic ranging and the bandwidth request ranging are almost similar to the above. Instead of ranging, only bandwidth request / periodic ranging is different.

6 is a diagram illustrating a frame structure for explaining an example of a ranging area allocation and an indication method thereof according to an embodiment of the present invention.

Referring to FIG. 6, the frame may be divided into downlink frame sections 710, 730, 750, and 770 and uplink frame sections 720, 740, 760, and 780.

Each of the downlink frames 710, 730, 750, and 770 may include a preamble region 718, an FCH region 711, a DL-MAP region 719, an UL-MAP region 712, and a downlink data burst region ( 702). Here, the FCH region 711 has a DLFP region as shown in Table 6 above. In the DLFP region, there are UL-MAP IE Existence for Initial Ranging, Allocation or Change for Initial Ranging, UL-MAP IE Existence for BW Request / Periodic Ranging, Allocation or Change for BW Request / Periodic Ranging fields. As illustrated in reference numerals 715, 733, 753, and 773 of FIG. 6, mapping of the above-described fields into A: B: C: D bit values in the order of the above-described fields will be used to describe an example of ranging region allocation and an indication scheme thereof. Shall be. That is, A is the UL-MAP IE Existence for Initial Ranging value, B is the Allocation or Change for Initial Ranging value, C is the UL-MAP IE Existence for BW Request / Periodic Ranging value, and D is the Allocation or Change for BW Request / Periodic Ranging value.

The base station informs the mobile subscriber stations of the ranging region allocation information through the DLFP region of the FCH of each downlink frame.

First, a case where A: B: C: D = 1: 1: 1: 0 is specified in the DLFP region will be described. Referring to the 710 downlink frame and 720 uplink frame, the base station allocates a new initial ranging region 721 to the uplink frame 720, and the bandwidth request / periodic ranging region allocated from the previous uplink frame. A: B: C: D bits in the DLFP region to 1: 1: 1: 0 to inform the mobile subscriber stations that the same ranging region 722 has been reallocated in the current uplink frame 720. Set it.

As described above, this means '11' for initial ranging and '10' for bandwidth demand / periodic ranging. That is, the information on the initial ranging region is included in the UL-MAP IE of the UL-MAP message, and the position and size of the initial ranging region are different from the position and size of the initial ranging region of the previous uplink frame. Inform. In addition, information on the bandwidth request / periodic ranging region is included in the UL-MAP IE of the UL-MAP message, and the location and size of the bandwidth request / periodic ranging region is the bandwidth request / periodic ranging region of the previous uplink frame. Notice that it is the same as the location and size of.

Mobile subscriber stations that recognize the DLFP region specified as 1: 1: 1: 0 may attempt initial ranging, and configure bandwidth request / periodic ranging region using the ranging region information already recognized. After that, uplink data bursts 723, 724, 725, 726, and 727 are sequentially allocated in an area except the configured ranging area.

Next, a case where A: B: C: D = 0: 1: 0: 0 is specified in the DLFP region will be described. Referring to the 730 downlink frame and the 740 uplink frame, the base station allocates the same initial ranging region 741 to the uplink frame 740 as the previous uplink frame region. However, the bandwidth request / periodic ranging region is not present in the uplink frame, and there is no UL-MAP IE having UIUC = 12 in the UL-MAP message. That is, it can be seen that the UL-MAP IE having UIUC = 12 is not included in the UL-MAP 732 region of the downlink frame 730. The base station informs the mobile subscriber stations of the 0: 1: 0: 0 DLFP with the above description through the FCH region 731.

Next, a case where A: B: C: D = 0: 1: 0: 1 is specified in the DLFP region will be described. Referring to the 750 downlink frame and 760 uplink frame, the base station allocates the same initial ranging region 761 to the uplink frame 760 as the previous uplink frame region. The base station also allocates the same bandwidth requirement / periodic ranging region 762 to the uplink frame 760 as the previous bandwidth requirement / periodic ranging region. However, it can be seen that the UL-MAP 732 region of the downlink frame 730 does not include the UL-MAP IE having UIUC = 12. The base station informs the mobile subscriber stations of the above-described 0: 1: 0: 1 DLFP through the FCH region 751.

Among the mobile subscriber stations receiving the FCH including the 0: 1: 0: 1 DLFP, the mobile subscriber station that recognizes the ranging region information of the previous uplink frame is an initial lane in the uplink frame 760. After the ranging region is configured for the ranging region and the bandwidth request / periodic ranging region, uplink data bursts are allocated in order in the remaining regions.

Finally, a case where A: B: C: D = 0: 0: 0: 0 is specified in the DLFP region will be described. Referring to the 770 downlink frame and the 780 uplink frame, the base station does not allocate an initial ranging region and a bandwidth request / periodic ranging region to the uplink frame 780. Therefore, it does not include the UL-MAP IE having UIUC = 12 in the UL-MAP message.

The mobile subscriber station receiving the FCH including the 0: 0: 0: 0 DLFP recognizes that there is no ranging region in the region of the uplink frame 780 and recognizes the uplink data bursts in the uplink frame. Can be assigned in order from the beginning of (780).

7A and 7B are flowcharts illustrating a process of allocating and indicating an initial ranging region and a bandwidth request / periodic ranging region according to an embodiment of the present invention.

로 진행한다. First, referring to FIG. 7A, in step 701, the base station determines whether an initial ranging region is allocated in an uplink frame. If it is determined in step 701 that the initial ranging region is to be allocated, the process proceeds to step 703. In step 713, the base station does not allocate the initial ranging region to the uplink frame. For this purpose, the UL-MAP IE Existence for Initial Ranging and Allocation or Change for Initial Ranging bits of the DLFP are set to '0', respectively, and the bandwidth is set. 7b for request / periodic ranging region allocation

Proceed to

In step 703, the base station determines whether the initial ranging region allocated to the uplink frame is the same as the initial ranging region allocated to the previous uplink frame. If the test result is the same, the process proceeds to step 705 and, if not, the process proceeds to step 711. In step 705, the UL-MAP message is included in the UL-MAP IE for initial ranging to determine whether it is necessary to transmit. This is to determine whether to include the initial ranging region information, that is, the initial ranging UL-MAP IE in the UL-MAP message periodically or as needed for the mobile subscriber station that does not recognize the initial ranging region information. As a result of the determination, if it is determined that the initial ranging UL-MAP IE is not included in the UL-MAP message, step 707 is performed.

, 즉 도 7b의 723단계로 진행한다. 상기 701단계부터 719단계까지는 상술한 바와 같이 초기 레인징 비트값이 '01'에 해당한다. 즉, 현재 상향 링크 프레임은 초기 레인징 영역을 포함하며, 상기 초기 레인징 영역은 이전 상향 링크 프레임의 초기 레인징 영역과 위치 및 크기가 동일하므로, UL-MAP 메시지에 초기 레인징용 UL-MAP IE를 포함하지 않는다. In step 707, the base station sets the Allocation or Change for Initial Ranging bit value of the DLFP to 1 and proceeds to step 715. This is to inform mobile subscriber stations that a periodic / bandwidth request ranging region is allocated to an uplink frame. In step 715, the base station proceeds to step 719 without including the initial ranging UL-MAP IE in the UL-MAP message. In step 719, the base station determines that the initial ranging UL-MAP IE is not included in the UL-MAP message and sets the UL-MAP IE Existence for Initial Ranging bit value of the DLFP to 0.

That is, the process proceeds to step 723 of FIG. 7B. As described above, from step 701 to step 719, the initial ranging bit value corresponds to '01'. That is, the current uplink frame includes an initial ranging region, and since the initial ranging region has the same position and size as the initial ranging region of the previous uplink frame, the UL-MAP IE for initial ranging is included in the UL-MAP message. Does not include

, 즉 도 7b의 723단계로 진행한다. 상기와 같이 UL-MAP IE Existence for Initial Ranging=1 및 Allocation or Change for Initial Ranging=0으로 설정하는 이유는 초기 레인징 영역 정보를 인지하지 못하고 있는 이동 가입자 단말기를 위함이다. 또한, 상기와 같은 초기 레인징 영역 정보를 모르고 있는 이동 가입자 단말기가 아니라 이미 초기 레인징 영역 정보를 인지하고 있는 이동 가입자 단말기는 상기 '10'으로 명시된 DLFP 정보를 수신하면, 이전 상향 링크 프레임의 초기 레인징 영역과 현재 상향 링크 프레임의 초기 레인징 영역의 위치 또는 크기가 동일함을 인지하게 된다. 따라서, 상기 이동 가입자 단말기는 UL-MAP 메시지의 UL-MAP IE를 디코딩하지 않아도 된다.In step 709, the base station sets the bit value of the Allocation or Change for Initial Ranging field of DLFP information to 0 and proceeds to step 717. FIG. In step 717, the base station includes an initial ranging UL-MAP IE in the UL-MAP message and proceeds to step 721. In step 721, the base station sets the bit value of the UL-MAP IE Existence for Initial Ranging field of the DLFP information to 1;

That is, the process proceeds to step 723 of FIG. 7B. The reason for setting UL-MAP IE Existence for Initial Ranging = 1 and Allocation or Change for Initial Ranging = 0 as described above is for a mobile subscriber station that does not recognize initial ranging region information. In addition, the mobile subscriber station that already recognizes the initial ranging region information, not the mobile subscriber station that does not know the initial ranging region information, receives the DLFP information indicated by '10', and then starts the previous uplink frame. It is recognized that the location or size of the ranging region and the initial ranging region of the current uplink frame are the same. Thus, the mobile subscriber station does not have to decode the UL-MAP IE of the UL-MAP message.

, 즉 도 7b의 723단계로 진행한다. 상기와 같이 UL-MAP IE Existence for Initial Ranging=1 및 Allocation or Change for Initial Ranging=1으로 설정하는 이유는 상향 링크 프레임의 초기 레인징 영역의 위치 및 크기가 이전 상향 링크 프레임의 초기 레인징 영역의 위치 및 크기에서 변경되었음을 알려주기 위함이다. 따라서, 모든 이동 가입자 단말기들은 상기 DLFP 정보를 수신하면, 상기 UL-MAP 메시지 내의 UL-MAP IE 정보를 디코딩하여 초기 레인징 정보의 업데이트를 수행한다.In step 711, the base station sets the bit value of the Allocation or Change for Initial Ranging field of the DLFP information to 1 and proceeds to step 717. In step 717, the base station includes an initial ranging UL-MAP IE in the UL-MAP message and proceeds to step 721. In step 721, the base station sets the bit value of the UL-MAP IE Existence for Initial Ranging field of the DLFP information to 1;

That is, the process proceeds to step 723 of FIG. 7B. The reason for setting UL-MAP IE Existence for Initial Ranging = 1 and Allocation or Change for Initial Ranging = 1 as described above is that the position and size of the initial ranging region of the uplink frame may be different from those of the initial ranging region of the previous uplink frame. This is to inform you of the change in position and size. Accordingly, when all the mobile subscriber stations receive the DLFP information, the mobile subscriber stations decode UL-MAP IE information in the UL-MAP message to update the initial ranging information.

단계까지와 유사한 과정을 나타낸다. 다만, 초기 레인징 대신 대역폭 요구/주기적 레인징이라는 것만 상이할 뿐이다. From step 723 of FIG. 7B to the end step, from step 701 of FIG. 7A

The process is similar to the step up. However, only the bandwidth requirement / periodic ranging instead of the initial ranging is different.

In step 723, the base station determines whether a bandwidth request / periodic ranging region is allocated in the current uplink frame. If it is determined in step 723 that the bandwidth request / periodic ranging region is to be allocated, the process proceeds to step 727. In step 731, the base station does not allocate a bandwidth request / periodic ranging region to an uplink frame, thereby performing UL-MAP IE Existence for BW Request / Periodic Ranging and Allocation or Change for BW Request / Periodic Ranging bits of DLFP information. Set each to '0'.

In step 727, the base station determines whether the bandwidth request / periodic ranging region allocated to the uplink frame is the same as the bandwidth request / periodic ranging region allocated to the previous uplink frame. If the result of the test is the same, the process proceeds to step 729 and, if not, the process proceeds to step 733. In step 729, the UL-MAP message is included in the UL-MAP IE for bandwidth request / periodic ranging to determine whether it is necessary to transmit. This means that the mobile subscriber station which is not aware of the bandwidth request / periodic ranging area information may periodically or optionally randomly request bandwidth request / periodic ranging area information, that is, bandwidth request / periodic ranging UL-MAP IE. To decide whether or not to include As a result of the determination, if it is determined not to include the bandwidth request / periodic ranging UL-MAP IE in the UL-MAP message, the process proceeds to step 733 and, if it is determined to include, the operation proceeds to step 735.

In step 733, the base station sets the Allocation or Change for BW Request / Periodic Ranging bit value of the DLFP to 1 and proceeds to step 741. This is to inform mobile subscriber stations that a periodic / bandwidth request ranging region is allocated to an uplink frame. In step 741, the base station proceeds to step 745 without including the bandwidth request / periodic ranging UL-MAP IE in the UL-MAP message. In step 745, the base station determines that the bandwidth request / periodic ranging UL-MAP IE is not included in the UL-MAP message and sets the UL-MAP IE Existence for BW Request / Periodic Ranging bit value of the DLFP to 0. . In step 723 to step 745, the bandwidth request / periodic ranging bit value corresponds to '01' as described above. That is, the current uplink frame includes a bandwidth request / periodic ranging region, and since the bandwidth request / periodic ranging region is the same position and size as the bandwidth request / periodic ranging region of the previous uplink frame, UL-MAP The message does not include the UL-MAP IE for bandwidth request / periodic ranging.

In step 735, the base station sets the bit value of the Allocation or Change for BW Request / Periodic Ranging field of DLFP information to 0 and proceeds to step 743. In step 743, the base station includes a UL-MAP IE for bandwidth request / periodic ranging in the UL-MAP message and proceeds to step 747. In step 747, the base station sets a bit value of a UL-MAP IE Existence for BW Request / Periodic Ranging field of DLFP information to 1. The reason for setting UL-MAP IE Existence for BW Request / Periodic Ranging = 1 and Allocation or Change for BW Request / Periodic Ranging = 0 as described above is based on the mobile subscriber station that is not aware of the bandwidth request / periodic ranging area information. For sake. In addition, if the mobile subscriber station that is already aware of the bandwidth request / periodic ranging area information, rather than the mobile subscriber station that does not know the bandwidth request / periodic ranging area information, and receives the DLFP information specified by '10', It will be appreciated that the bandwidth or the periodic ranging region of the previous uplink frame and the bandwidth requirement / periodic ranging region of the current uplink frame are the same. Thus, the mobile subscriber station does not have to decode the UL-MAP IE of the UL-MAP message.

In step 739, the base station sets the bit value of the Allocation or Change for BW Request / Periodic Ranging field of DLFP information to 1 and proceeds to step 743. In step 743, the base station includes a UL-MAP IE for bandwidth request / periodic ranging in the UL-MAP message and proceeds to step 747. In step 747, the base station sets a bit value of a UL-MAP IE Existence for BW Request / Periodic Ranging field of DLFP information to 1. The reason for setting UL-MAP IE Existence for BW Request / Periodic Ranging = 1 and Allocation or Change for BW Request / Periodic Ranging = 1 is as follows. This is to inform that the position and size of the bandwidth requirement / periodic ranging region of the uplink frame have been changed. Therefore, when all the mobile subscriber stations receive the DLFP information, the mobile subscriber station decodes UL-MAP IE information in the UL-MAP message to update bandwidth request / periodic ranging information.

8A to 8C are flowcharts illustrating a ranging area recognition and a ranging process according to the mobile subscriber station according to an embodiment of the present invention.

로, 즉 도 8b의 821단계로 진행한다.First, referring to FIG. 8A, in step 801, the mobile subscriber station transmits DLFP information through an FCH region of a downlink frame, a DL-MAP message through a DL-MAP region, and a UL-MAP message through an UL-MAP region. Receive and proceed to step 807. In step 807, the MSS checks whether a bit value of a UL-MAP IE Existence for Initial Ranging field is 0 in the DLFP information. If the bit value is 0, the process proceeds to step 809, and if 1, the process proceeds to step 811. In step 809, the mobile subscriber station checks whether a bit value of an Allocation or Change for Initial Ranging field of DLFP information is zero. If the bit value is 0, the process proceeds to step 817. If the bit value is 0, the process proceeds to step 813. In step 817, the mobile subscriber station recognizes that there is no initial ranging UL-MAP IE in the UL-MAP message and that there is no initial ranging region in the uplink frame.

That is, the process proceeds to step 821 of FIG. 8B.

Meanwhile, in step 811, the mobile subscriber station checks whether a bit value of a UL-MAP IE Existence for Initial Ranging field of DLFP information is zero. If it is 0, the process proceeds to step 813 and if 1, the process proceeds to step 815.

In step 813, the mobile subscriber station recognizes that an initial ranging region is allocated to a current uplink frame, and the initial ranging region has the same position and size of the initial ranging region of a previous uplink frame.

로, 즉 도 8b의 821단계로 진행한다.In step 815, the MS recognizes that the initial ranging area is newly changed, updates the initial ranging area information according to the UL-MAP IE of the UL-MAP message.

That is, the process proceeds to step 821 of FIG. 8B.

Next, referring to FIG. 8B, in step 821, the MSS checks whether a bit value of a UL-MAP IE Existence for BW Request / Periodic Ranging field of DLFP information is 0. As a result of the check, if the bit value is 0, the process proceeds to step 823, and if the bit value is 1, the step proceeds to step 825. In step 823, the mobile subscriber station checks whether a bit value of an Allocation or Change for BW Request / Periodic Ranging field of DLFP information is zero. If the result of the test is 0, the process proceeds to step 831, and if 1, the process proceeds to step 827. FIG. In step 831, the MS recognizes that there is no bandwidth requirement / periodic ranging region in the current uplink frame.

In step 825, the mobile subscriber station checks whether the bit value of the Allocation or Change for BW Request / Periodic Ranging field of DLFP information is zero. If it is 0, the process proceeds to step 827, and if 1, the process proceeds to step 829.

In step 827, the mobile subscriber station is allocated a bandwidth request / periodic ranging region to a current uplink frame, and the bandwidth request / periodic ranging region is a location of a bandwidth request / periodic ranging region of a previous uplink frame and You will notice that they are the same size.

로, 즉 도 8c의 835단계로 진행한다.In step 829, the mobile subscriber station recognizes that the bandwidth request / periodic ranging area is newly changed, updates the bandwidth request / periodic ranging area information according to the UL-MAP IE of the UL-MAP message.

That is, the process proceeds to step 835 of FIG. 8C.

Referring to FIG. 8C, FIG. 8C is a process in which the mobile station performs ranging. First, in step 835, the mobile subscriber station includes ranging indication information of DLFP information, that is, an initial ranging area UL-MAP IE Existence for Initial Ranging field, an Allocation or Change for Initial Ranging field, and a UL-MAP IE Existence. By reading the bit values of the for BW Request / Periodic Ranging field and the Allocation or Change for BW Request / Periodic Ranging field, it is possible to determine whether an initial ranging region exists in the uplink frame. Therefore, if there is an initial ranging region, the process proceeds to step 837. If the initial ranging region does not exist, the process proceeds to step 839. In step 837, if the mobile subscriber station needs to perform initial ranging, the mobile subscriber station proceeds to step 843. If it is not necessary to perform initial ranging, the mobile subscriber station proceeds to step 839.

In step 843, the mobile subscriber station knows the existence of the initial ranging region, its location and size, and attempts initial ranging by transmitting a ranging code to the base station through the initial ranging region of the uplink frame.

In step 839, the MS determines whether a bandwidth request / periodic ranging region exists in an uplink frame. As a result of the determination, if the bandwidth requirement / periodic ranging region exists, the process proceeds to step 841 and, if not, the process proceeds to step 847.

In step 841, the mobile subscriber station proceeds to step 845 when it is necessary to perform bandwidth request / periodic ranging, and proceeds to step 847 when it is not necessary to perform it.

In step 845, the mobile subscriber station attempts bandwidth request / periodic ranging by transmitting a ranging code to a base station through a bandwidth request / periodic ranging region of a recognized uplink frame.

In step 847, the mobile subscriber station completes initial ranging and bandwidth request / periodic ranging and then performs uplink data in the remaining region except for the initial ranging and bandwidth request / periodic ranging region in the uplink frame. Recognizing that a burst can be assigned, proceed to step 851. In step 851, the mobile subscriber station transmits data traffic through the data burst allocation region.

The ranging region allocation method for the first embodiment of the present invention has been described above.

Hereinafter, a second embodiment in which the UL-MAP message can be reduced by excluding a UL-MAP information element having UIUC = 12 in the UL-MAP message in the allocation of the ranging region will be described.

Second embodiment

In the second embodiment, a method for allowing a mobile station to perform ranging through a ranging region previously allocated to an uplink frame without including a UL-MAP IE having UIUC = 12 in a UL-MAP message is provided. Let's explain.

(1) Downlink Frame Prefix (DLFP)

The DLFP is information transmitted through the FCH region as described in Table 1 above. DLFP information proposed in the second embodiment of the present invention is shown in Table 7 below.

The DLFP information is information transmitted through the FCH region as described above. In the present invention, one bit among the four bits remaining as a reserve of the conventional DLFP information in Table 1 is used as an initial ranging change indication (Initial Ranging_Change_Indication) for a similar purpose to a ranging change indication field. Suggest that. The remaining fields are the same as the contents of Tables 1 and 6, and description thereof will be omitted.

The Initial Ranging_Change_Indication bit proposed in the first embodiment of the present invention is similar to the Ranging_Change_Indication bit described in Table 1, and compares the previous uplink frame with the current uplink frame to determine whether the allocation position or size of the initial ranging region is changed. Bit indicating whether there is any deallocation. In other words, when there is a change in the initial ranging region, the base station includes a new initial ranging UL-MAP IE in the UL-MAP message and sets the Initial Ranging_Change_Indication bit of the DLFP information to 1.

In addition, when a new initial ranging region is newly allocated to the uplink frame, the initial ranging IE is included in the UL-MAP message and the initial Ranging_Change_Indication bit of the DLFP information is set to one. When the same initial ranging region exists in the next uplink frame, the base station sets the Initial Ranging_Change_Indication bit of the DLFP to 0, and does not include the initial ranging IE in the UL-MAP message. The Initial Ranging_Change_Indication bit value is maintained until a change in the initial ranging region or the initial ranging region is not included in the uplink frame.

If the initial ranging region is not allocated, the base station sets the Initial Ranging_Change_Indication bit of the DLFP to 1 to inform mobile subscriber stations of the change of the initial ranging region, and includes an initial ranging IE in a UL-MAP message. I never do that.

The mobile subscriber station must recognize the Initial Ranging_Change_Indication bit to perform initial ranging. That is, the mobile subscriber station that should attempt initial ranging should wait until it first receives DLFP information having the Initial Ranging_Change_Indication bit value of 1 when entering the network. If the mobile station first receives DLFP information having the Initial Ranging_Change_Indication bit value of 1, the mobile subscriber station determines whether an initial ranging IE having UIUC = 12 exists in a UL-MAP message. As a result of determination, if the initial ranging UL-MAP IE is present, the mobile subscriber station recognizes that the initial ranging region exists in the uplink frame and transmits a ranging code through the recognized initial ranging region. do.

However, if the initial ranging UL-MAP IE does not exist in the UL-MAP message, the mobile subscriber station cannot transmit a ranging code since there is no initial ranging region in the uplink frame. Accordingly, the mobile subscriber station must delay transmission of a ranging code until it receives DLFP information having an Initial Ranging_Change_Indication bit value of 1, which indicates a frame to which an initial ranging region is allocated.

Meanwhile, mobile subscriber stations that do not perform initial ranging, i.e., mobile subscriber stations receiving normal service by performing a network entry procedure with a base station, continuously recognize the change in the bit values of the two Ranging_Change_Indication fields and the Initial Ranging_Change_Indication fields. Thus, whether a bandwidth request / periodic ranging region or an initial ranging region is allocated to the uplink frame should be determined, and thus the data burst allocation region should be known.

The base station may periodically or optionally optionally include an initial ranging UL-MAP IE in a UL-MAP message for a mobile subscriber station that is not aware of the initial ranging region information, and as a result, may be periodically or in an uplink frame. An initial ranging region may optionally be allocated.

On the other hand, when the ranging region allocation and the indication operation scheme proposed by the present invention as described above are applied to a broadband wireless access communication system, mobile subscriber stations that cannot perform the operation scheme may exist. In other words, if there is no initial ranging UL-MAP IE or periodic / bandwidth request ranging UL-MAP information IE in the UL-MAP, the mobile subscriber station does not have a ranging region allocated as described in the related art. It can be recognized as. In this case, the base station has a bit value of the Allocation or Change for Initial Ranging field is 1, that is, a ranging region exists in an uplink frame, but a bit value of the UL-MAP IE Existence for Initial Ranging field is 0, that is, UL-MAP. If there is no UL-MAP IE in the message, data bursts may not be allocated to mobile subscriber stations that cannot perform the operation of the present invention.

That is, the base station is a mobile subscriber that does not perform the present invention in the connection identifier (CID) field of the UL-MAP IE having UIUC = 1 to UIUC = 11 or the UL-MAP IE having UIUC = 15 of the UL-MAP message. Do not assign connection identifiers of terminals. As described above, the present invention can be applied to a system in which mobile subscriber stations that do not support the ranging area of the present invention exist.

Third embodiment

The DLFP format proposed in the third embodiment of the present invention is the same as the conventional DLFP format shown in Table 1. However, while the Ranging_Change_Indication field in the DLFP format shown in Table 1 was a field indicating a change in bandwidth request / periodic ranging region allocation, in the third embodiment, the Ranging_Change_Indication field is the change in the bandwidth request / periodic ranging region allocation or initial stage. It is different that it is an indication field indicating a change in ranging area allocation.

That is, if the bit value of the Ranging_Change_Indication field in the DLFP format of Table 1 is '0', it means that the bandwidth request / periodic ranging allocation area of the previous frame is the same as the bandwidth request / periodic ranging allocation area in the current frame. In addition, if the bit value of the Ranging_Change_Indication field is '1' in the DLFP format of the conventional Table 1, it means that the bandwidth request / periodic ranging allocation area of the previous frame is different from the bandwidth request / periodic ranging allocation area in the current frame.

However, if the bit value of the Ranging_Change_Indication field of the DLFP format according to the third embodiment of the present invention is '0', the bandwidth request / periodic ranging allocation region or the initial ranging allocation region of the previous frame is the bandwidth request / periodic of the current frame. It is the same as the ranging allocation area or the initial ranging allocation area. In addition, if the bit value of the Ranging_Change_Indication field of the DLFP format according to the third embodiment of the present invention is '1', the bandwidth request / periodic ranging allocation area or the initial ranging allocation area of the previous frame is the bandwidth request / periodic in the current frame. It is different from the ranging allocation area or the initial ranging allocation area.

Therefore, in the third embodiment of the present invention, the case where the bit value of the Ranging_Change_Indication field is set to '1' is as follows.

First, the position of the bandwidth request / periodic ranging region allocated to the previous uplink frame is changed in the current uplink frame, or the bandwidth request / periodic ranging region is allocated and then deallocated in the next frame. On the contrary, there is a change from unassignment to allocation.

Second, if the position of the initial ranging region allocated to the previous uplink frame is changed in the current uplink frame, the initial ranging region is allocated and then deallocated in the next frame, or vice versa. This is the case when changes occur from unallocated to allocated.

Third, when at least one of the two conditions occurs when both of the first and second conditions are satisfied, the bit value of the Ranging_Change_Indication field may be set to '1'.

When the base station satisfies one of the three conditions, the base station sets the bit value of the Ranging_Change_Indication field to '1' and may perform the following operations.

For example, when the base station allocates only the initial ranging region to an uplink frame to which the bandwidth request / periodic ranging region and the initial ranging regions are not allocated, the base station sets the Ranging_Change_Indication field to '1', and the current uplink frame Since only the initial ranging region is allocated, the UL-MAP message includes only the UL-MAP IE corresponding to the initial ranging.

As another example, when there is a change in bandwidth requirement / periodic ranging region allocation in the current uplink frame compared to the previous uplink frame, or when the position is different from the position in the previous uplink frame, the base station may change the Ranging_Change_Indication field. Set to '1' and include the UL-MAP IE corresponding to the bandwidth request / periodic ranging in the UL-MAP message.

In addition, when a change (change of area itself or change of allocation) occurs in both an initial ranging area and a bandwidth request / periodic ranging area, the base station sets the Ranging_Change_Indication field to '1' and the UL-MAP message. Includes a UL-MAP IE corresponding to the initial ranging and a UL-MAP IE corresponding to the bandwidth requirement / periodic ranging.

In addition, the bandwidth request / periodic ranging and initial ranging region is allocated to a previous uplink frame, but the initial ranging region is deallocated in the current uplink frame, so that only the bandwidth request / periodic ranging region is allocated. There can be. In this case, since the bandwidth request / periodic ranging region is still allocated to the uplink frame, the UL-MAP message should include the UL-MAP IE corresponding to the bandwidth request / periodic ranging.

If the bandwidth requirement / periodic ranging and initial ranging regions are allocated in the previous uplink frame and then allocated in the current uplink frame, and thus the regions do not exist, this also changes the ranging region allocation. The base station sets the Ranging_Change_Indication field to '1'. However, there is no UL-MAP IE with UIUC = 12 in the UL-MAP message.

In summary, when a change occurs in at least one of the bandwidth request / periodic ranging and the initial ranging area, the base station sets the Ranging_Change_Indication field of the DLFP to '1' and UL-MAP to correspond to the change result. The UL-MAP message is configured by determining whether to include the IE.

Meanwhile, if the Ranging Change Indication bit value of the DLFP is '1', the initial ranging UL-MAP IE and the bandwidth request / cyclic ranging UL-MAP IE exist in the UL-MAP message of the corresponding uplink frame. The allocation information of the ranging region in the uplink frame is checked. The mobile subscriber station which first attempts to enter the network waits until it receives a DLFP having a Ranging_Change_Indication bit value of '1'. If the mobile subscriber station receives the DLFP having the Ranging_Change_Indication bit value of '1', the mobile subscriber station checks whether there is an initial ranging IE with UIUC = 12 in the UL-MAP message.

If the initial ranging UL-MAP IE is present in the UL-MAP message, the mobile subscriber station recognizes that the initial ranging region exists in an uplink frame. Accordingly, the mobile subscriber station can attempt initial ranging by transmitting a ranging code through the recognized initial ranging region. However, if the initial ranging UL-MAP IE does not exist in the UL-MAP message, it is recognized that there is no initial ranging region in the uplink frame. Accordingly, the mobile subscriber station cannot attempt ranging and waits for transmission of a ranging code until a DLFP having a Ranging_Change_Indication bit value of '1' is received.

Meanwhile, among mobile subscriber stations not performing initial ranging, the mobile subscriber station that needs to perform periodic ranging or additional bandwidth needs to wait until first receiving a DLFP having a Ranging_Change_Indication bit value of '1'. . If the mobile subscriber station first receives a DLFP having the Ranging Change Indication bit value of '1', the mobile subscriber station checks whether a UL-MAP IE corresponding to a bandwidth request / periodic ranging having UIUC = 12 exists in a UL-MAP message. do. If there is a UL-MAP IE corresponding to a bandwidth request / periodic ranging in the UL-MAP message, the MS recognizes that an initial ranging region is allocated to an uplink frame. Accordingly, the mobile subscriber station transmits a ranging code corresponding to the bandwidth requirement / periodic ranging through the bandwidth request / periodic ranging region. However, if there is no UL-MAP IE corresponding to the bandwidth request / periodic ranging in the UL-MAP message, the mobile subscriber station transmits the ranging code until receiving the next DLFP whose Ranging_Change_Indication bit value is '1'. Wait

Meanwhile, the mobile subscriber stations normally communicating with the base station continuously recognize the change in the Ranging_Change_Indication bit value to determine whether the bandwidth request / periodic ranging region or the initial ranging region is allocated or changed in the uplink frame. shall. According to the result of the determination, the mobile subscriber station must be aware that data bursts are allocated in the remaining areas remaining in the uplink frame.

Accordingly, the base station may arbitrarily and optionally perform UL-MAP IE and bandwidth request / initial ranging for the mobile subscriber station that does not recognize the initial ranging information or the mobile subscriber station that does not recognize the periodic ranging information. The periodic ranging UL-MAP IE may be included in the UL-MAP message or only one of the two may be included. Accordingly, the uplink frame may have periodic or optionally initial ranging regions or bandwidth requirements / periodic ranging regions together or separately.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention has an advantage of reducing message overhead by adaptively excluding ranging region allocation information included in a broadcast message to be transmitted every frame. Accordingly, bandwidth transmission efficiency can be increased, and the mobile subscriber station does not need to decode the broadcast message unnecessarily when the same ranging area information is recognized in advance.

Claims (32)

In the broadband wireless access communication system, the ranging area allocation and the indication method performed by the base station, Including whether the ranging region is allocated to the first region of every downlink frame and whether the change information is included; Determining whether to include information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information; And allocating or not allocating a ranging region in an uplink frame according to whether the ranging region is allocated and change information.  The method of claim 1, And the first region is a frame control header (FCH) region. The method of claim 1, The ranging region allocation and change information may include UL-MAP IE Existence for Initial Ranging information indicating whether initial ranging information is present in an uplink map (UL-MAP) message, a previous uplink frame and a current uplink. Allocation or Change for Initial Ranging information indicating allocation or change of initial ranging region between frames and UL-MAP IE Existence for BW Request / indicating whether bandwidth request / periodic ranging information is present in UL-MAP message. And at least one of Periodic Ranging information and Allocation or Change for BW Request / Periodic Ranging information indicating allocation or change of bandwidth / periodic ranging region between a previous uplink frame and a current uplink frame. Way. The method of claim 1, And whether or not the ranging region allocation and change information includes Initial Ranging_Change_Indication information indicating an allocation or change of an initial ranging region between a previous uplink frame and a current uplink frame. The method of claim 1, The ranging region allocation information and the change information may include Ranging_Change_Indication information indicating an allocation or change of an initial ranging region or a bandwidth request / periodic ranging region allocation or change between a previous uplink frame and a current uplink frame. Said method comprising: a. The method of claim 5, The Ranging_Change_Indication information indicates that the ranging region of the current uplink frame is different from the ranging region of the previous uplink frame when at least one ranging region of the initial ranging region and the bandwidth request / periodic ranging region is allocated or changed. The method as characterized in that the information to be indicated. The method of claim 1, The ranging region allocation and change information are included in downlink frame predecessor (DLFP) information transmitted through the FCH region. The method of claim 1, And the second region is an uplink map (UL-MAP) region. A ranging method performed by a mobile subscriber station in a broadband wireless access communication system, Receiving whether the ranging region is allocated and the change information included in the first region of each downlink frame; Determining whether to read information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information; Recognizing a ranging region of an uplink frame according to the read result; And performing ranging through the recognized ranging region.  The method of claim 9, And the first region is a frame control header (FCH) region. The method of claim 9, The ranging region allocation and change information may include UL-MAP IE Existence for Initial Ranging information indicating whether initial ranging information is present in an uplink map (UL-MAP) message, a previous uplink frame and a current uplink. Allocation or Change for Initial Ranging information indicating allocation or change of initial ranging region between frames and UL-MAP IE Existence for BW Request / indicating whether bandwidth request / periodic ranging information is present in UL-MAP message. The method comprising the Periodic Ranging information, and Allocation or Change for BW Request / Periodic Ranging information indicating the allocation or change of the bandwidth / periodic ranging region between the previous uplink frame and the current uplink frame. The method of claim 9, And whether or not the ranging region allocation and change information includes Initial Ranging_Change_Indication information indicating an allocation or change of an initial ranging region between a previous uplink frame and a current uplink frame. The method of claim 9, The ranging region allocation information and the change information may include Ranging_Change_Indication information indicating an allocation or change of an initial ranging region or a bandwidth request / periodic ranging region allocation or change between a previous uplink frame and a current uplink frame. Said method comprising: a. The method of claim 13, The Ranging_Change_Indication information indicates that the ranging region of the current uplink frame is different from the ranging region of the previous uplink frame when at least one ranging region of the initial ranging region and the bandwidth request / periodic ranging region is allocated or changed. The method as characterized in that the information to be indicated. The method of claim 9, The ranging region allocation and change information are included in downlink frame predecessor (DLFP) information transmitted through the FCH region. The method of claim 9, And the second region is an uplink map (UL-MAP) region. In a broadband wireless access communication system, a ranging area allocation and ranging method performed between a base station and a mobile subscriber station, The base station includes a process of including a ranging region allocation and change information in the first region of each downlink frame, Determining, by the base station, whether to include information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information; Not allocating or allocating a ranging region in an uplink frame according to whether the ranging region is allocated and change information; The base station transmitting the downlink frame to the mobile subscriber station; Receiving, by the mobile subscriber station, ranging information allocated to the ranging region included in the first region of each downlink frame and change information; Determining, by the mobile subscriber station, whether or not to read information necessary for performing ranging in a broadcast message broadcast through a second region of every downlink frame according to whether the ranging region is allocated and the change information; The mobile subscriber station recognizing a ranging region of an uplink frame according to a read result; And wherein the mobile subscriber station performs ranging through the recognized ranging region. The method of claim 17, And the first region is a frame control header (FCH) region. The method of claim 17, The ranging region allocation and change information may include UL-MAP IE Existence for Initial Ranging information indicating whether initial ranging information is present in an uplink map (UL-MAP) message, a previous uplink frame and a current uplink. Allocation or Change for Initial Ranging information indicating allocation or change of initial ranging region between frames and UL-MAP IE Existence for BW Request / indicating whether bandwidth request / periodic ranging information is present in UL-MAP message. The method comprising the Periodic Ranging information, and Allocation or Change for BW Request / Periodic Ranging information indicating the allocation or change of the bandwidth / periodic ranging region between the previous uplink frame and the current uplink frame. The method of claim 17, And whether or not the ranging region allocation and change information includes Initial Ranging_Change_Indication information indicating an allocation or change of an initial ranging region between a previous uplink frame and a current uplink frame. The method of claim 17, The ranging region allocation information and the change information may include Ranging_Change_Indication information indicating an allocation or change of an initial ranging region or a bandwidth request / periodic ranging region allocation or change between a previous uplink frame and a current uplink frame. Said method comprising: a. The method of claim 17, The Ranging_Change_Indication information indicates that the ranging region of the current uplink frame is different from the ranging region of the previous uplink frame when at least one ranging region of the initial ranging region and the bandwidth request / periodic ranging region is allocated or changed. The method as characterized in that the information to be indicated. The method of claim 17, The ranging region allocation and change information are included in downlink frame predecessor (DLFP) information transmitted through the FCH region. The method of claim 17, And the second region is an uplink map (UL-MAP) region. In a broadband wireless access communication system, a ranging area allocation and ranging performing system performed between a base station and a mobile subscriber station, A ranging region is allocated to the first region of every downlink frame and whether or not the change information is allocated, and the ranging is allocated to a broadcast message broadcasted through the second region of every downlink frame according to the ranging region and the change information. Determining whether to include information necessary for the execution, and transmitting the downlink frame to the mobile subscriber station without allocating or allocating a ranging region to an uplink frame according to whether the ranging region is allocated and the change information; Base station, Receive a ranging region allocation and change information included in the first region of every downlink frame from the base station, and broadcasts through the second region of every downlink frame corresponding to the ranging region allocation and the change information The mobile subscriber determines whether to read information necessary for performing ranging in a broadcast message, recognizes a ranging region of an uplink frame according to the read result, and performs ranging through the recognized ranging region. Said system comprising a terminal. The method of claim 25, And the first region is a frame control header (FCH) region. The method of claim 25, The ranging region allocation and change information may include UL-MAP IE Existence for Initial Ranging information indicating whether initial ranging information is present in an uplink map (UL-MAP) message, a previous uplink frame and a current uplink. Allocation or Change for Initial Ranging information indicating allocation or change of initial ranging region between frames and UL-MAP IE Existence for BW Request / indicating whether bandwidth request / periodic ranging information is present in UL-MAP message. Wherein the system comprises Periodic Ranging information and Allocation or Change for BW Request / Periodic Ranging information indicating allocation or change of bandwidth / periodic ranging region between a previous uplink frame and a current uplink frame. The method of claim 25, The ranging region allocation and change information includes Initial Ranging_Change_Indication information indicating an allocation or change of an initial ranging region between a previous uplink frame and a current uplink frame. The method of claim 25, The ranging region allocation information and the change information may include Ranging_Change_Indication information indicating an allocation or change of an initial ranging region or a bandwidth request / periodic ranging region allocation or change between a previous uplink frame and a current uplink frame. Said system comprising: a. The method of claim 25, The Ranging_Change_Indication information indicates that the ranging region of the current uplink frame is different from the ranging region of the previous uplink frame when at least one ranging region of the initial ranging region and the bandwidth request / periodic ranging region is allocated or changed. Said system characterized by information to be indicated. The method of claim 25, The ranging region allocation and change information are included in downlink frame predecessor (DLFP) information transmitted through the FCH region. The method of claim 25, And the second region is an uplink map (UL-MAP) region.

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