KR20080034594A - Apparatus and method for ranging region allocation in boradband wireless access communication system - Google Patents

Abstract

An apparatus and a method for allocating a ranging region in a broadband wireless access communication system are provided to prevent a waste of uplink radio resources and improve the use efficiency of resources by enabling a base station to allocate an uplink bandwidth according to the purpose of ranging of a terminal. A data processing unit(609) extracts a message including a CDMA code range for ranging from a base station, a message including an allocated uplink bandwidth, and a ranging result message. A ranging management unit(613) receives a message including the CDMA code range, selects a CDMA code index suitable for the purpose of ranging, and performs ranging by using the allocated uplink bandwidth. A data generating unit(615) generates a control message for transmitting the selected CDMA code index, generates a ranging request message for ranging, and transfers the same. A controller(611) provides the ranging management unit with the information from the data processing unit, provides the information of the raging management unit to the data generating unit, and manages the data processing unit, the raging management unit and the data generating unit.

Description

Apparatus and method for ranging area allocation in a broadband wireless access communication system {APPARATUS AND METHOD FOR RANGING REGION ALLOCATION IN BORADBAND WIRELESS ACCESS COMMUNICATION SYSTEM}

1 illustrates a conventional ranging related field and a TLV;

2 is a flowchart illustrating an operation process of a base station according to an embodiment of the present invention;

3 is a flowchart illustrating an operation process of a user terminal according to an exemplary embodiment of the present invention;

4 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention;

5 is a flowchart illustrating an operation process of a user terminal according to another embodiment of the present invention;

6 is a flowchart illustrating a block configuration of a base station or a user terminal according to an embodiment of the present invention;

7 illustrates ranging related fields and TLVs according to an embodiment of the present invention.

The present invention relates to ranging area allocation in a broadband wireless access communication system, and an apparatus and method for preventing unnecessary loss of uplink bandwidth by subdividing the CDMA code area in the ranging process from the present. It is about.

In the 4th Generation (hereinafter, referred to as '4G') communication system, providing users with services having various quality of service (QoS) with a transmission rate of about 100 Mbps. Active research is in progress. In particular, in the current 4G communication system, broadband wireless access such as a wireless local area network (LAN) system and a wireless urban area network (MAN) system Access: Research is being actively conducted to support high-speed services in the form of guaranteeing mobility and quality of service (QoS) in a BWA communication system. In addition, the representative communication system is a broadband wireless access communication system, and Institute of Electrical and Electronics Engineers (IEEE) 802.16d communication system and IEEE 802.16e communication system are representatively used. Wimax or Wibro use the IEEE 802.16d communication system technology and the IEEE 802.16e communication system technology.

The IEEE 802.16d communication system and the IEEE 802.16e communication system are orthogonal frequency division multiplexing (OFDM) for supporting a broadband transmission network on a physical channel of the wireless MAN system. (Orthogonal Frequency Division Multiple Access (hereinafter referred to as 'OFDMA')). The IEEE 802.16d communication system is a system currently considering only a single cell structure and a state in which a subscriber station (hereinafter referred to as SS) is fixed, that is, no mobility of the SS is considered. In contrast, the IEEE 802.16e communication system is a system that considers the mobility of the SS in the IEEE 802.16d communication system, and the SS having the mobility is called a mobile station. Hereinafter, the mobile terminal and the subscriber terminal will be referred to as a user terminal.

The user terminal goes through a ranging process with the base station when accessing the network. The ranging process is a process of adjusting a "time offset", a "frequency offset", etc. between a user terminal and a base station and exchanging information such as management information. The user terminal may access the corresponding network through the ranging process, and performs the ranging process even when moving to the target BS through the handover procedure.

In addition, when transitioning from the idle mode to the normal operation mode suggested by the communication system as a power saving method of the user terminal, it is necessary to select the best base station at the time of transition and to access the network for the operation in the normal operation mode. In this case, the ranging process is performed. This ranging process is performed for various purposes.

The procedure of the ranging process can generally be divided into code ranging and RNG-REQ message ranging, and only code ranging can be performed alone, and code ranging and RNG-REQ message ranging are performed. It may be combined and performed sequentially.

First, with reference to code ranging, the user terminal transmits a specific CDMA code, and the base station which detects the code ranging responds with an RNG-RSP message. The base station determines whether "time offset", "frequency offset" and power adjustment of the corresponding user terminal are necessary for the CDMA code index detected by the base station, and responds with the result through the RNG-RSP message. The user terminal receives the RNG-RSP message to determine whether the code ranging attempted by the user is successful and performs the necessary offset adjustment.

CDMA codes are distinguished by CDMA code indexes. The user terminal should use a specific range of CDMA codes depending on the purpose of the ranging operation. The base station identifies the purpose of the ranging process of the user terminal according to the CDMA code index transmitted by the user terminal and performs support corresponding to each purpose.

The uplink channel descriptor (UCD) message transmitted by the base station includes a parameter indicating a range of CDMA code indexes supported by the base station. Currently, the IEEE 802.16e-2005 standard includes the following information in UCD messages. The UCD message is used when the base station informs the uplink region of each user terminal through the UL-MAP and uses information called UIUC (Uplink Interval Usage Code). Each user terminal can know the modulation scheme / channel encoding scheme to be applied to the uplink region allocated to the UE through the UIUC information. The UCD message includes information in which UIUC values and modulation schemes / channel encoding schemes are mapped. In addition, the UCD information includes a CDMA code range that should be used for operations such as "Initial ranging", "periodic ranging", "bandwidth request", and "handover".

1 illustrates a conventional ranging related field and a TLV.

Referring to FIG. 1, "Start ranging code group" is a start index of a CDMA code index supported by a corresponding base station and is represented by S (0 to 255). "Initial ranging code" indicates an initial network access by a user terminal. Is the number of CDMA codes used for the purpose of initial ranging, expressed as N (0 to 255). The "Periodic ranging code" is the number of CDMA codes used when the user terminal performs periodic ranging. And denoted by M (0 to 255), " Bandwidth request code " is the number of CDMA codes used by the user terminal to request uplink bandwidth allocation for uplink data transmission and denoted by L (0 to 255). , "Handover ranging code" is the number of CDMA codes used when the user terminal performs the handover ranging to the target base station, and is represented by 0 (0 to 255), and the user terminal performs the purpose of performing each ranging. Depending on the The CDMA code corresponding to the CDMA code index should be transmitted as follows. For initial ranging, use CDMA codes in the range of S to S + (N-1), and for periodic ranging, use CDMA codes for the range of S + N to S + N + (M-1). For bandwidth requests, CDMA codes in the range of S + N + M to S + N + M + (L-1) are used, and for handover ranging, S + N + M + L to S + N + L + ( The CDMA code corresponding to the range O-1) should be used.

Now, when the ranging of the RNG-REQ message is described, the RNG-REQ message is transmitted using an uplink bandwidth allocated by the base station, and the base station that detects the RNG-REQ message responds with the RNG-RSP message. In this case, the RNG-REQ message includes different parameters for each purpose, such as initial access, location update, transition from idle mode to normal operation mode, and handover. Since the parameters included for each purpose are different, the size of the overall RNG-REQ message also varies for each purpose. The base station receiving the RNG-REQ message checks the parameters included in the RNG-REQ message to determine the purpose of the user terminal, and transmits an RNG-RSP message including the parameters suitable for the purpose to the user terminal. do.

In order for a user terminal to transmit an RNG-REQ message, an uplink region for transmitting an RNG-REQ message must be allocated from a base station. The base station allocates an uplink region to a specific user terminal for a ranging process, and there are two main methods.

First, the allocation through the "CDMA-Alloc-IE" will be described. In the code ranging process, when the CDMA code transmitted by the user terminal is detected by the base station within an appropriate "timing, frequency", reception level range, the base station Including "ranging status = success" in the RNG-RSP message indicates that the code ranging process was successful. In addition, the base station notifies the success of the code ranging, and allocates an uplink bandwidth through which the user terminal can transmit the RNG-REQ message using the "CDMA_Alloc-IE" information included in the UL-MAP. When the base station allocates the uplink bandwidth for transmitting the RNG-REQ message of the user terminal through the "CDMA_Alloc-IE", the uplink bandwidth size to be allocated depends on the range of the CDMA code index received by the base station.

Describing allocation through “Unsolicited UL BW Grant”, the base station may induce transmission of the RNG-REQ message at any point in time, even if the user terminal does not attempt code ranging and bandwidth request for transmitting the RNG-REQ message. The uplink bandwidth is allocated.

As described above, the base station allocates an uplink bandwidth required for transmitting the RNG-REQ message to support the RNG-REQ message ranging performed by the user terminal. In general, the base station allocates the uplink bandwidth through the “CDMA-Alloc-IE”. In the uplink bandwidth allocation using "CDMA-Alloc-IE", a code ranging process must be performed first. The base station can know the size of the uplink bandwidth to be allocated to the "CDMA_Alloc-IE" through the CDMA code index determination received from the user terminal during the code ranging process. Here, the CDMA code index and the size in bytes of the required RNG-REQ message according to each ranging purpose are shown in Table 1 below.

CDMA Codex Index Range Ranging Purpose RNG-REQ Size (byte)  Initial ranging code area Initial ranging 20 location update in idle mode 28 Re-entry from idle mode, QCS 31  Handover ranging code area Handover ranging 34 Handover Ranging (PSC) 54

As shown in Table 1, the sizes of CDMA codes and RNG-REQ messages used according to ranging purposes are different. However, when the base station receives the CDMA code of the initial ranging code region or the CDMA code of the handover ranging code region, as shown in Table 1, the ranging of the user terminal is determined using only the CDMA code index. The base station cannot accurately grasp the purpose. Accordingly, when the base station receives the CDMA code of the initial ranging code region in Table 1, the base station should allocate uplink bandwidth of 31 bytes or more through the "CDMA-Alloc IE" and the CDMA code of the handover ranging code region. When receiving, 54 bytes or more should be allocated.

If the base station does not allocate uplink bandwidth for transmitting the RNG-REQ message of the size required by the user terminal for each ranging code region, that is, an uplink allocated to the user terminal through "CDMA-Alloc IE" If the link bandwidth is smaller than the size required for the RNG-REQ message for its purpose, the user terminal cannot transmit the RNG-REQ message. Since the uplink bandwidth cannot be accumulated and transmitted, the user terminal should use the allocated uplink bandwidth in the uplink section of the frame immediately following the frame in which the "CDMA_Alloc IE" is received.

In this way, the user terminal that receives the "CDMA_Alloc IE" that does not satisfy the uplink bandwidth required for transmitting the RNG-REQ message needs to redo the code ranging process through the CDMA code again. The initial network connection, exit from idle mode, and handover elapsed time may not meet requirements. In addition, since the base station also allocates an uplink bandwidth that cannot be used by the user terminal, uplink resource utilization is very poor in terms of uplink resource utilization.

Therefore, the base station should allocate the maximum size of the uplink bandwidth to the area of the received CDMA code index. However, this allocation method is a result of not knowing exactly the ranging purpose of the user terminal, and in most cases, there is a problem that wastes uplink resources by allocating unnecessary uplink bandwidth.

An object of the present invention is to provide a ranging area allocation apparatus and method in a broadband wireless access communication system.

Another object of the present invention is to provide an apparatus and method for preventing unnecessary loss of uplink bandwidth by subdividing the CDMA code region in the broadband wireless access communication system.

According to a first aspect of the present invention for achieving the above object, a method for allocating an uplink bandwidth of a base station in a broadband wireless access communication system, the method comprising: transmitting a message including a CDMA code range; The method includes receiving a code index, determining a ranging purpose through the CDMA code index, and allocating an uplink bandwidth corresponding to the determined target according to the determined purpose.

According to a second aspect of the present invention for achieving the above object, in a method for requesting an uplink bandwidth of a user terminal in a broadband wireless access communication system, receiving a message including a CDMA code range, and the CDMA code range Determining a ranging purpose, transmitting a CDMA code index corresponding to the determined ranging purpose, receiving an uplink bandwidth after the transmitting process, and a size of the allocated uplink bandwidth. And performing a ranging by transmitting a ranging request message having a range.

According to a third aspect of the present invention for achieving the above object, an apparatus of a user terminal for requesting an uplink bandwidth in a broadband wireless access communication system, the message including the CDMA code range for ranging from the base station, the allocation; Receiving a message including a predetermined uplink bandwidth, a data processing unit for extracting a ranging result message, a message including the CDMA code range, selecting a CDMA code index suitable for a ranging purpose, and assigning the allocated uplink bandwidth A ranging management unit for performing the ranging by using, and a data generating unit for generating a control message for the transmission of the selected CDMA code index, and generates and transmits a ranging request message for ranging.

According to a fourth aspect of the present invention for achieving the above object, in a device of a base station for allocating uplink bandwidth in a broadband wireless access communication system, a CDMA code index and a ranging request message for ranging received from a user terminal A data processing unit for extracting a message, a ranging manager for selecting a CDMA code range for the ranging, allocating an uplink bandwidth using the CDMA code index, and receiving the ranging request message to determine a result; And a data generator for generating and delivering a message including the selected CDMA code range, a message including the allocated uplink bandwidth, and a response message including a result of the ranging request. do.

According to a fifth aspect of the present invention for achieving the above object, in a system for allocating uplink bandwidth in a broadband wireless access communication system, selecting a CDMA code range for ranging, and the ranging received from the user terminal Allocates an uplink bandwidth in a CDMA code index for the CDMA code index, determines a result of the received ranging request message message, includes the selected CDMA code range, an allocated uplink bandwidth, and a result of the ranging request Selecting and transmitting a CDMA code index suitable for a ranging purpose using a base station transmitting a response and a CDMA code range for ranging received from the base station, and a ranging request message using an uplink bandwidth allocated from the base station It characterized in that it comprises a user terminal for performing the ranging by transmitting a The.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

do. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, an apparatus and method for assigning a ranging area in a broadband wireless access communication system will be described.

The present invention uses a scheme of allocating an uplink bandwidth for transmitting a RNG-REQ message of a corresponding user terminal through UL-MAP information called "CDMA_Alloc-IE" for the case of successful code ranging. As shown in Table 1, the purpose of the ranging performed using the initial ranging code is largely three, and the size of the RNG-REQ message required according to each purpose is 20, 28, and 31 bytes. In addition, there are two main purposes of ranging performed using a handover ranging code, and the size of an RNG-REQ message required according to each purpose is 34 or 54 bytes. The method proposed in the present invention is as follows.

First, the first method will be described by newly defining "location update ranging code TLV", "Quick Connection Setup (QCS) ranging code TLV" and "Handover ranging code with PSC TLV" mentioned in Table 2 below. Include in other broadcast messages and send. Description of this is the same as FIGS. 2 and 3.

name type (byte) length value location update ranging code TBD One number of location update ranging CDMA code. Possible values are 0-255 QCS ranging code TBD One number of QCS ranging CDMA code. Possible values are 0-255 Handover with PSC ranging code TBD One number of handover with PSC ranging CDMA code. Possible values are 0-255

Table 2 shows location update ranging code, QCS ranging code, and handover ranging code with PSC (TLVs).

2 is a flowchart illustrating an operation process of a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 2, in step 200, the base station transmits the TLVs mentioned in Table 2, that is, "location update ranging code", "QCS ranging code", "Handover with PSC ranging codes", or a UCD message. Include in other broadcast messages and send.

Thereafter, in step 210, the CDMA code index is received from the user terminal.

Thereafter, in step 220, 20 bytes are allocated for the "initial ranging code region" according to the CDMA code index, 28 bytes are allocated for the "location update ranging code region", and 31 bytes for the "QCS ranging code region". Uplink, 34 bytes in case of "Handover ranging code region", 54 bytes in case of "Handover with PSC ranging code region", and uplink for transmitting RNG-REQ message through "CDMA-Alloc IE". Allocates bandwidth.

The algorithm of the present invention is then terminated.

3 is a flowchart illustrating an operation process of a user terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 3, in step 310, the user terminal may include a UCD or other broadcast message including "location update ranging code", "QCS ranging code", and "Handover with PSC ranging code" mentioned in Table 2 above. Receive

After that, in step 320, the CDMA code index of the "initial ranging code region" is transmitted in the case of "initial raging purpose", and the "location update ranging code region" in the case of "location update ranging purpose" according to the purpose of each ranging. Transmit a CDMA code index, transmit a CDMA code index of a "QCS ranging code area" for a "QCS ranging purpose", and transmit a CDMA code index of a "Handover ranging code area" for a "Handover ranging code area" In case of "Handover with PSC ranging code", the CDMA code index of "Handover with PSC ranging code area" is transmitted.

Then, the algorithm according to the present invention is terminated.

Now, when the second method is described, the value definitions for "initial ranging code TLV" and "Handover ranging code TLV" mentioned in <Table 3> are modified as shown in <Table 4>, and the modified value is UCD. Or other broadcast messages included in the transmission. The description thereof is the same as FIGS. 4 and 5.

name type (byte) length value initial ranging code predefined One number of location update ranging CDMA code. Possible values are 0-255 Handover ranging code predefined One number of QCS ranging CDMA code. Possible values are 0-255

Table 3 shows values of original initial ranging code and handover ranging code TLV.

name type (byte) length value initial ranging code predefined One number of location update ranging CDMA code. Possible values are 0-255. This value has to be multiple of 3. Handover ranging code predefined One number of QCS ranging CDMA code. Possible values are 0-255. This value has to be multiple of 2.

Table 4 shows values of modified initial ranging code and handover ranging code TLV.

4 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention.

Referring to FIG. 4, in step 410, the base station transmits the TLVs mentioned in Table 4, that is, "initial ranging code" and "handover ranging code" in a UCD message or other broadcast message.

Thereafter, in step 420, the CDMA code index is received from the user terminal.

Thereafter, in step 430, 20 bytes are allocated to the first 1/3 region of the initial ranging code in the case of "initial raging purpose" according to the CDMA code index, and in the middle of "initial ranging code" in the case of "location update ranging purpose." 1/3 byte ", 28 bytes are allocated for the" QCS ranging purpose ", 31 bytes are allocated to the" third 1/3 area of the initial ranging code ", and for" Handover ranging purpose ", 34 bytes are allocated to the first half area, and 54 bytes are allocated to the second half area of the handover ranging code in the case of "Handover with PSC ranging purpose" and the RNG-REQ is performed through the "CDMA-Alloc IE". Allocates uplink bandwidth for message transmission.

The algorithm of the present invention is then terminated.

5 is a flowchart illustrating an operation process of a terminal according to another embodiment of the present invention.

Referring to FIG. 5, in step 510, the user terminal receives the TLVs mentioned in Table 4, that is, a UCD or other broadcast message including an "initial ranging code" and a "handover ranging code."

Thereafter, in step 520, the CDMA code is transmitted in the first 1/3 region of the initial ranging code in the case of "initial ranging purpose", and in the case of "location update ranging purpose" in the case of "initial ranging purpose". In the case of the "QCS ranging purpose", the CDMA code selected in the "third 1/3 area of the code" is transmitted. In the case of the "QCS ranging purpose", the CDMA code selected in the "third 1/3 area of the initial ranging code" is transmitted. The CDMA code selected in the first half area of the handover ranging is transmitted, and the CDMA code selected in the second half area of the handover ranging is transmitted in the case of the "handover with PSC ranging purpose".

Then, the algorithm according to the present invention is terminated.

4 and 5, the base station first sets the "start ranging code group TLV" value to 100, the "initial ranging code TLV" value to 9, and the "periodic ranging code TLV". "Value is set to 3," bandwidth request code TLV "value is set to 3, and" Handover ranging code TLV "value is set to 6 and transmitted.

Subsequently, the user terminal receives the TLV and transmits a "CDMA code index indicating 100 to 102" during initial ranging for initial network access, and a CDMA indicating "103 to 105" during a location update. Code index "and, upon quick connection establishment (QCS), transmit" CDMA code index, which represents between 106 and 108 ", and when handover, transmit" CDMA code index, which represents between 115 and 117 ", and PSC At the handover, the " CDMA code index indicating between 118 and 120 &quot; is transmitted.

Thereafter, the base station allocates 20 bytes when receiving a CDMA code index in the range of "100-102", allocates 28 bytes when receiving a CDMA code index in the range of "103-105", and allocates 28 bytes in a range of "106-108". 31 bytes are allocated when receiving the CDMA code index, 34 bytes are allocated when the CDMA code index is received in the range of "115 to 117", and 54 bytes are allocated when the CDMA code index is received in the range of "118 to 120".

6 is a block diagram of a base station or a user terminal according to an embodiment of the present invention.

 As shown, the user terminal or base station according to the present invention, the RF processor 601, ADC 603, OFDM demodulator 605, decoder 607, data processor 609, controller 611, lane A management unit 613, a data generator 615, an encoder 617, an OFDM modulator 619, a DAC 621, an RF processor 623, a switch 625, and a time controller 627. .

Referring to FIG. 6, first, the time controller 627 controls the switching operation of the switch 625 based on frame synchronization. For example, if the signal receiving section, the time controller 627 controls the switch 625 to connect the antenna and the RF processor 601 of the receiving end, and if the signal transmitting section, the antenna and the transmitting end The switch 625 is controlled to be connected to the RF processor 623. During the reception period, the RF processor 601 converts a radio frequency (RF) signal received through an antenna into a baseband analog signal. The ADC 603 converts an analog signal from the RF processor 601 into sample data and outputs the sample data. The OFDM demodulator 605 outputs data in the frequency domain by fast Fourier transform (FFT) the sample data output from the ADC 603.

The decoder 607 selects data of subcarriers to be actually received from data in the frequency domain from the OFDM demodulator 605, demodulates the selected data according to a predetermined modulation level (MCS level), and Decode and output

The data processor 609 decomposes the control message and data input from the decoder 607 and provides the result to the controller 611. In particular, according to the present invention, a CDMA code index for ranging and a ranging request message (RNG-REQ) message are extracted and provided to the ranging manager 613 through the controller 611.

Or extracts a message (UCD or other broadcast message) including a TLV for ranging, a message (CDMA-Alloc-IE) including an allocated uplink bandwidth, and a response message (REQ-RSP) for a ranging request. To the ranging manager 613 through the controller 611.

The controller 611 provides information from the data processor 609 to the ranging manager 613. Alternatively, the information provided by the ranging manager 613 is provided to the data generator 615. In addition, the controller 611 manages the data processor 609, the ranging manager 613, and the data generator 615.

The ranging manager 613 selects TLVs to be transmitted under the control of the controller 611, allocates an uplink bandwidth using the provided CDMA code index, and receives a Raging Request Message (RNG-REQ) message. The result is determined and the response is provided to the data generation unit 613 through the control unit 611.

In addition, the ranging manager 613 selects a CDMA code index for ranging through the provided TLV and performs ranging using an uplink bandwidth allocated through "CDMA-Alloc-IE".

The data generator 615 generates a control message or data using various information provided through the controller 611 and outputs the control message or data to the encoder 617 of the physical layer. In particular, according to the present invention, the data generator 615 generates a UCD or broadcast message including a TLV, generates a "CDMA-Alloc IE" for allocating an uplink bandwidth, and responds to a ranging request. Create a REQ-RSP message to include.

In addition, the data generator 615 generates a control message for transmitting the selected CDMA code index, and generates an RNG-REQ message for ranging.

The encoder 617 codes and modulates the data from the data generator 615 according to a predetermined modulation level (MCS level) and outputs the encoded data. The OFDM modulator 619 outputs sample data (OFDM symbols) by performing IFFT (Inverse Fast Fourier Transform) on the data from the encoder 617. The DAC 621 converts the sample data into an analog signal and outputs the analog signal. The RF processor 623 converts an analog signal from the DAC 621 into a radio frequency (RF) signal and transmits the same through an antenna.

In the above-described configuration, the controller 611 is a protocol controller and controls the data processor 609, the data generator 615, and the ranging manager 613. That is, the controller 611 may perform the functions of the data processor 609, the data generator 615, and the ranging manager 613. In the present invention, it is separately configured to describe each function separately. Therefore, in actual implementation, all of them may be configured to be processed by the controller 611, and only some of them may be configured to be processed by the controller 611.

Next, the operation of the user terminal and the base station will be described based on the configuration of FIG. 6. Hereinafter, the control message processing performed in the MAC layer will be described.

First, referring to a user terminal, the data processor 609 may include a message including a TLV for ranging received from a base station, a message including an allocated uplink bandwidth (CDMA-Alloc-IE), and a ranging request. The response message REQ-RSP is extracted and provided to the ranging manager 613 through the controller 611.

The controller 611 provides the ranging manager 613 with information from the data processor 609. Alternatively, the information provided by the ranging manager 613 is provided to the data generator 615. In addition, the controller 611 manages the data processor 609, the ranging manager 613, and the data generator 615.

The ranging management unit 613 selects a CDMA code index for ranging through the TLV of the received message and performs ranging using an uplink bandwidth allocated through "CDMA-Alloc-IE".

The data generator 615 generates a control message or data using various information provided through the controller 611 and outputs the control message or data to the encoder 617 of the physical layer. In particular, according to the present invention, the data generator 615 generates a control message for transmitting the selected CDMA code index and generates an RNG-REQ message for ranging.

The data generator 615 generates a message and data to be transmitted to the base station under the control of the controller 611 and delivers the message and data to the physical layer. The message and data generated by the data generator 609 are processed into a form that can be transmitted in the physical layer and then transmitted through an antenna.

Next, referring to the base station, the data generation unit 615 generates a message and data to be transmitted to the user terminal under the control of the control unit 611 and delivers it to the physical layer. In particular, according to the present invention, a UCD or broadcast message for TLV transmission is generated, a "CDMA-Alloc IE" for allocating uplink bandwidth, and an RNG-RSP message including a response to a ranging request is generated. do. The message and data generated by the data generator 609 are processed into a form that can be transmitted in the physical layer and then transmitted through an antenna.

The ranging manager 613 selects TLVs to be transmitted under the control of the controller 611, allocates an uplink bandwidth using the provided CDMA code index, and receives a ranging request message (RNG-REQ) message. The result is determined and provided to the data generator 613 through the controller 611.

The data processor 609 analyzes the control message received from the user terminal and notifies the controller 611 of the result. In particular, according to the present invention, a CDMA code index for ranging and a ranging request message (RNG-REQ) message are extracted and provided to the ranging manager 613 through the controller 611.

7 illustrates ranging related fields and TLVs according to an embodiment of the present invention.

Referring to FIG. 7, the values P, Q, and R for the ranging code group, "Location update ranging code", "Network Re-entry ranging codes", and "Handover with power saving class" are compared with FIG. It can be seen that values related to parameter ranging codes "and" Periodic ranging backoff "have been added.

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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

 The present invention further informs the base station of the purpose of ranging attempted by the user terminal using a CDMA code index, thereby enabling the base station to allocate an uplink bandwidth corresponding to the ranging purpose, thereby wasting uplink radio resources. It can prevent and improve its use efficiency.

Claims (21)

A method for allocating uplink bandwidth of a base station in a broadband wireless access communication system, Sending a message containing a CDMA code range, Receiving a CDMA code index after the transmission process; Determining a ranging purpose through the CDMA code index; And allocating an uplink bandwidth corresponding to the identified purpose. The method of claim 1, The message including the CDMA code range includes a type length value (TLV) including a location update ranging code having a value between 0 and 255, and a quick connection setting having a value between 0 and 255. A TLV including a ranging code (QCS ranging code) and a TLV including a PSC handover ranging code having a value between 0 and 255. The method of claim 1, The message including the CDMA code range includes a TLV including an initial ranging code having an integer multiple of three and a handover ranging code having an integer multiple of two. And a TLV. The method of claim 2, The process of allocating the uplink bandwidth corresponding to the identified purpose If the identified purpose is initial ranging, the predetermined byte is allocated to an area of the initial ranging code. If the identified purpose is location update Ranging, a predetermined byte is allocated to an area of the location update ranging code. In case of QCS Ranging, a predetermined byte is allocated to an area of the quick connection setting ranging code, If the identified purpose is handover ranging, a predetermined byte is allocated to an area of the handover ranging code, And when the determined purpose is PSC handover ranging, the predetermined byte is allocated to an area of the PSC handover ranging code. The method of claim 3, wherein The process of allocating the uplink bandwidth corresponding to the identified purpose If the purpose of the grasping is initial ranging, the predetermined byte is allocated to the first third area of the initial ranging code. In the case where the identified purpose is location update ranging, a predetermined byte is allocated to the middle 1/3 area of the initial ranging code. In the case of the above-mentioned purpose of fast connection setting ranging (QCS Ranging), a predetermined byte is allocated to the second half of the initial ranging code, If the purpose of the grasping is handover ranging, a predetermined byte is allocated to the first half area of the handover ranging code, And when the identified purpose is handover with PSC Ranging, allocating a predetermined byte to the second half region of the handover ranging code. A method for requesting an uplink bandwidth of a user terminal in a broadband wireless access communication system, Receiving a message containing a CDMA code range, Determining a specific CDMA code among the CDMA code ranges based on a ranging purpose; Transmitting an index for the CDMA code corresponding to the determined ranging purpose; Receiving an uplink bandwidth after the transmission process; And performing ranging by transmitting a ranging request message having the size of the allocated uplink bandwidth. The method of claim 6, The message including the CDMA code range includes a TLV including a location update ranging code having a value between 0 and 255, and a quick connection establishment ranging code having a value between 0 and 255. and a TLV including a ranging code and a TSC including a PSC handover ranging code having a value between 0 and 255. The method of claim 6, The message including the CDMA code range includes a TLV including an initial ranging code having an integer multiple of 3 and a handover ranging code having an integer multiple of 2 And a TLV. The method of claim 7, wherein The process of transmitting the CDMA code index corresponding to the determined ranging purpose, If the determined purpose is initial ranging, the CDMA code of the initial ranging code region is transmitted; If the determined purpose is location update Ranging, transmit the CDMA code of the location update ranging code region, If the determined purpose is QCS Ranging, the CDMA code of the quick connection setting ranging code region is transmitted, If the determined purpose is handover ranging, the CDMA code of the handover ranging code region is transmitted; If the determined purpose is PSC handover ranging (PSC handover ranging), characterized in that for transmitting the CDMA code of the PSC handover ranging code region, The method of claim 8, The process of transmitting the CDMA code index corresponding to the determined ranging purpose, If the determined purpose is initial ranging, the selected CDMA code is transmitted in the first 1/3 region of the initial ranging code, If the determined purpose is location update Ranging, transmit the selected CDMA code in the middle 1/3 area of the initial ranging code, If the determined purpose is fast connection establishment ranging (QCS Ranging), and transmits the selected CDMA code in the latter 1/3 area of the initial ranging code, If the determined purpose is handover ranging, the selected CDMA code is transmitted in the first half region of the handover ranging code, If the determined purpose is handover with PSC Ranging, transmitting the selected CDMA code in the second half of the handover ranging code. An apparatus of a user terminal for requesting an uplink bandwidth in a broadband wireless access communication system, A data processor including a message including a CDMA code range for ranging from a base station, a message including an allocated uplink bandwidth, and a ranging result message; A ranging manager configured to receive a message including the CDMA code range, select a CDMA code index suitable for a ranging purpose, and perform ranging using the allocated uplink bandwidth; And a data generator for generating a control message for transmitting the selected CDMA code index and for generating and delivering a ranging request message for ranging. The method of claim 11, The message including the CDMA code range includes a TLV including a location update ranging code having a value between 0 and 255, and a quick connection establishment ranging code having a value between 0 and 255. a TLV including a ranging code and a TLV including a PSC handover ranging code having a value between 0 and 255, The method of claim 11, The message including the CDMA code range includes a TLV including an initial ranging code having an integer multiple of 3 and a handover ranging code having an integer multiple of 2 Apparatus characterized in that the TLV. The method of claim 12, The ranging manager receives a message including the CDMA code range for the ranging and selects a CDMA code of an initial ranging code region when the ranging purpose is initial ranging. If the ranging purpose is location update Ranging, select the CDMA code of the location update ranging code region, If the ranging purpose is QCS Ranging, select the CDMA code in the quick link setting ranging code area, If the ranging purpose is handover ranging, select the CDMA code of the handover ranging code area, And when the ranging purpose is PSC handover ranging, the CDMA code of the PSC handover ranging code region is selected. The method of claim 13, The ranging manager receives a message including the CDMA code range for the ranging and transmits the selected CDMA code in the first 1/3 region of the initial ranging code when the ranging purpose is initial ranging. and, If the purpose of the ranging is location update Ranging, transmit the selected CDMA code in the middle 1/3 area of the initial ranging code, If the ranging purpose is fast connection establishment ranging (QCS Ranging), and transmit the selected CDMA code in the latter 1/3 area of the initial ranging code, If the ranging purpose is handover ranging, the selected CDMA code is transmitted in the first half region of the handover ranging code, And when the ranging purpose is handover with PSC Ranging, transmitting the selected CDMA code in the second half region of the handover ranging code. An apparatus of a base station for allocating uplink bandwidth in a broadband wireless access communication system, A data processor extracting a CDMA code index and a ranging request message message for ranging received from a user terminal; A ranging manager for selecting a CDMA code range for the ranging, allocating an uplink bandwidth using the CDMA code index, and receiving the ranging request message to determine a result thereof; And a data generator for generating and delivering a message including the selected CDMA code range, a message including the allocated uplink bandwidth, and a response message including a result of the ranging request. . The method of claim 16, The message including the CDMA code range includes a TLV including a location update ranging code having a value between 0 and 255, and a quick connection establishment ranging code having a value between 0 and 255. and a TLV including a ranging code, and a TLV including a PSC handover ranging code having a value between 0 and 255. The method of claim 16, The message including the CDMA code range includes a TLV including an initial ranging code having an integer multiple of 3 and a handover ranging code having an integer multiple of 2 Apparatus characterized in that the TLV. The method of claim 17, The ranging manager receives a message including the CDMA code range for the ranging, and allocates a predetermined byte to the area of the initial ranging code when the ranging purpose is initial ranging. If the purpose of ranging is location update ranging, a predetermined byte is allocated to an area of the location update ranging code. If the ranging purpose is quick connection establishment ranging (QCS Ranging), a predetermined byte is allocated to an area of the quick connection establishment ranging code, When the ranging purpose is handover ranging, a predetermined byte is allocated to an area of the handover ranging code, And when the ranging purpose is handover with PSC Ranging, allocating a predetermined byte to an area of the PSC handover ranging code. The method of claim 18, The ranging manager receives a message including the CDMA code range for the ranging, and allocates a predetermined byte to the first third area of the initial ranging code when the ranging purpose is initial ranging. If the purpose of ranging is location update ranging, then a predetermined byte is allocated to the middle third of the initial ranging code. If the ranging purpose is fast connection establishment ranging (QCS Ranging), a predetermined byte is allocated to the second third area of the initial ranging code, If the ranging purpose is handover ranging, a predetermined byte is allocated to the first half area of the handover ranging code, And when the ranging purpose is handover with PSC Ranging, allocating a predetermined byte to the second half region of the handover ranging code. A system for allocating uplink bandwidth in a broadband wireless access communication system, Select a CDMA code range for ranging, allocate an uplink bandwidth in a CDMA code index for ranging received from a user terminal, determine a result of the received ranging request message message, and select the selected CDMA code range A base station transmitting a response including an allocated uplink bandwidth and a result of the ranging request; The CDMA code index for the ranging received from the base station is selected and transmitted according to the ranging purpose, and the ranging request message is transmitted using the uplink bandwidth allocated from the base station. System comprising a user terminal.

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