KR100684305B1 - A method for allocating radio resource in wireless system and apparatus thereof - Google Patents

Abstract

Information for different subscribers of a service with the same modulation and channel encoding method is transmitted by allocating radio resources in a wireless portable Internet system. Also, identifier information on the subscriber of a concurrently allocated radio resource is transmitted through common control information. Therefore, information for a plurality of subscribers coexists in a single radio resource block, and it can be easily transmitted. Since a subscriber station which has received downlink information can know to which radio resource block the information for the corresponding station is allocated through the subscriber identifier information transmitted as common control information, the subscriber station can access desired information by accessing a specific radio resource block to which information for the subscriber is allocated in the received frame.

Description

A method for allocating radio resource in wireless system and apparatus

1 is a schematic diagram showing an outline of a wireless portable Internet.

2 is a hierarchical diagram showing the hierarchical structure of the wireless portable Internet system.

3 is a schematic diagram illustrating a connection structure between a base station and a subscriber station device in a wireless portable Internet system.

4 is a frame diagram illustrating resource allocation in a conventional wireless communication system.

5A is a diagram for explaining a radio resource allocation method in the prior art.

5B is a view for explaining another conventional resource allocation method.

6 is a diagram illustrating radio resource allocation according to an embodiment of the present invention.

7 is a diagram illustrating a configuration of a common control information block according to an embodiment of the present invention.

8 is a block diagram showing the configuration of a base station of a radio resource allocation apparatus according to an embodiment of the present invention.

9 is a block diagram showing the configuration of a radio resource allocation unit of a base station according to an embodiment of the present invention.

10 is a block diagram showing the configuration of a terminal of a radio resource allocation apparatus according to an embodiment of the present invention.

11 is a block diagram showing the configuration of a common control information reading unit according to an embodiment of the present invention.

12 is a flowchart illustrating a method of allocating radio resources according to an embodiment of the present invention.

13 is a flowchart illustrating a method of accessing a downlink radio resource by a subscriber station according to an embodiment of the present invention.

The present invention relates to a radio resource allocation method and apparatus therefor in a wireless portable Internet system.

More specifically, the present invention can transmit the subscriber information along with the radio resource allocation in the downlink resource allocation of the wireless portable Internet system to access only the radio resources to which the packet data for the subscriber terminal is allocated to retrieve the information. A radio resource allocation method and apparatus therefor.

The wireless portable Internet is a next generation communication method that further supports mobility in a short range data communication method using a fixed access point like a conventional wireless LAN.

Various standards have been proposed for such a wireless portable Internet, and international standardization of the portable internet is currently progressing around the IEEE 802.16e.

1 is a schematic diagram showing an outline of a wireless portable Internet.

The wireless portable Internet system basically includes a subscriber station 10, base stations 20 and 21 performing wireless communication with the subscriber station, routers 30 and 31 connected through the base station and a gateway, and an internet network.

Conventional wireless LAN methods such as IEEE 802.11 provide a data communication method capable of wireless communication within a short distance around a fixed access point, but this provides mobility of a subscriber station (hereinafter referred to as SS). Rather, it was limited to supporting short-range data communications over wireless rather than wired.

On the other hand, the wireless portable Internet system promoted by the IEEE 802.16 group and the like ensures the mobility even when the subscriber station 10 shown in FIG. 1 moves from the cell managed by the base station 20 to the cell managed by the base station 21. It will provide an uninterrupted data communication service.

IEEE 802.16e is basically a standard that supports metropolitan area network (MAN), and means an information communication network covering an intermediate area between a local area network (LAN) and a wide area network (WAN).

Accordingly, the wireless portable Internet system supports handover of the subscriber station 10 like the mobile communication service, and performs dynamic IP address allocation according to the movement of the subscriber station.

In this case, the wireless portable Internet subscriber station 10 and the base stations 20 and 21 communicate with each other by orthogonal frequency division multiple access (OFDMA). The OFDMA scheme is a multiplexing scheme combining a frequency division scheme using a plurality of orthogonal subcarriers as a plurality of subchannels and a time division scheme (TDM) scheme. The OFDMA scheme is inherently resistant to fading occurring in multipath, and has a high data rate.

In addition, IEEE 802.16e adopts an adaptive modulaton and coding (AMC) method in which modulation and coding schemes are adaptively selected between requesting and accepting subscriber stations 10 and base stations 20 and 21. It was.

2 is a hierarchical diagram showing the hierarchical structure of the wireless portable Internet system.

The hierarchical structure of the IEEE 802.16e wireless portable Internet system is largely divided into a physical layer (L10) and a media access control (hereinafter referred to as MAC) layer (L21, L22, L23).

The physical layer L10 is responsible for a wireless communication function performed in a normal physical layer such as modulation and demodulation and coding.

On the other hand, the wireless portable Internet system does not have a hierarchical layer for each function like a wired Internet system, and takes charge of various functions in one MAC layer.

Looking at the sub-layers by function, the MAC layer includes a privacy sub-layer (L21), a MAC common layer (L22), and a service specific set sub-layer (L23).

The service specific convergence sublayer L23 is responsible for payload header suppression and QoS mapping functions in continuous data communication.

The MAC common sublayer L22 is an essential part of the MAC layer, and is responsible for system access, bandwidth allocation, connection establishment and maintenance, and QoS management.

The privacy sublayer L21 performs device authentication, security key exchange, and encryption functions. Only authentication of the device is performed in the privacy sublayer L21, and user authentication is performed in an upper layer (not shown) of the MAC.

3 is a schematic diagram illustrating a connection structure between a base station and a subscriber station device in a wireless portable Internet system.

The MAC layer of the subscriber station (SS) and the MAC layer of the base station (BS) has a connection relationship called Connection.

The term " connection C1 " used in the present invention means a logical connection rather than a physical connection, and the MAC of the subscriber station (SS) and the base station (BS) to transmit traffic of one service flow. Defined by the mapping relationship between peers.

Accordingly, the parameter or message defined on the connection C1 defines a function between MAC sibling layers, and in reality, the parameter or message is processed and framed and transmitted through the physical layer, and the frame is analyzed and the MAC layer is analyzed. It will perform the function corresponding to that parameter or message.

The MAC message includes various messages for performing request (REQ), response (RSP), and acknowledgment (ACK) for various operations.

4 is a frame diagram illustrating resource allocation in a conventional wireless communication system.

In the conventional cellular system for packet transmission, in order to efficiently use radio resources rather than using a dedicated channel for any subscriber in allocating radio resources for data transmission using characteristics of bursted packet data. Allocates radio resources in the form of shared channels. Therefore, even one radio resource can transmit packet data for a plurality of subscribers. In addition, any subscriber station is given a unique identifier for distinguishing subscribers from the mobile communication network, and at the same time, since a plurality of services having different quality of service (hereinafter, referred to as QoS) can be provided, a connection is provided. A plurality of services that can be simultaneously provided by any one subscriber are identified by being given a Connection Identifier (hereinafter referred to as a CID).

In the OFDMA system illustrated in FIG. 4, the horizontal axis means time-divided symbols, and the vertical axis means subchannels composed of a plurality of subcarriers. In the system, radio resources WM1 to WM9 are allocated in a rectangular structure. In the prior art, there are two methods for allocating the radio resources WM1 to WM9 to subscribers.

5A is a diagram for explaining a radio resource allocation method in the prior art.

In the first conventional technology, as the radio resources (WM1 to WM9) and subscriber station information have a one-to-one mapping relationship, the terminal accesses only downlink radio resources allocated to the terminal. However, although the conventional technology has an advantage of low power consumption due to easy access of the radio resources of the subscriber station, the radio resource allocation is allocated in a two-dimensional rectangular structure based on data transmission symbol units on the time axis and subcarriers on the radio resource axis. Due to its characteristics, it is difficult to accurately match the allocated two-dimensional unit area and the amount of packet data to be transmitted, and thus, there is a disadvantage in that an efficient radio resource allocation is difficult because an empty resource space cannot be transmitted in the allocated radio resource space.

That is, as shown in Figure 5a, there is no guarantee that the packet data (P1 ~ P7) is filled in the radio resource (WMn) allocated to a particular subscriber station, the loss of resources corresponding to the space (S) occurs A problem arises.

5B is a view for explaining another conventional resource allocation method.

In another prior art, a single radio resource block is allocated together with a plurality of services having information for a plurality of subscribers and different connection identifiers provided by a certain subscriber station at the same time.

The prior art has the advantage of minimizing the area that cannot transmit data in the allocated two-dimensional radio resource space, thereby maximizing the efficiency of the allocated radio resource, while the SS is used for downlink When received, it is unable to recognize a radio resource to which its packet data is allocated. Therefore, all radio resource blocks WM1 to WM10 transmitted in downlink should be accessed to search for information on each connection.

Therefore, there is a disadvantage that power consumption increases and is not suitable for use of a wireless portable Internet subscriber station using a battery.

That is, the above-described prior arts have inefficiencies in the use of radio resources and have a problem of limiting mobility of the subscriber station due to high power consumption.

In order to solve the above-mentioned problems of the prior art, the present invention transmits subscriber information together with radio resource allocation when allocating downlink radio resources in a wireless portable Internet system so that only radio resources to which packet data for a corresponding subscriber station are allocated are allocated. Provided are a method and an apparatus capable of increasing battery use efficiency by enabling low power consumption of a mobile subscriber station by accessing and retrieving information.

More specifically, in the present invention, a service having the same modulation and channel encoding method allocates radio resources by grouping services having different subscriber information and different connections for one subscriber into one group and allocates radio resources. In addition, the identifier information of the subscriber for the allocated radio resource is transmitted through the common control information. Accordingly, information for a plurality of subscribers may coexist and be transmitted in one radio resource block, and the subscriber station receiving downlink information may receive information for the corresponding terminal through identifier information of the subscriber transmitted as common control information. The present invention provides a method and apparatus for acquiring information by accessing only a specific radio resource block to which information for a subscriber is allocated in a received frame.

In order to achieve the above object of the present invention, a method for allocating a radio resource according to an aspect of the present invention includes determining a modulation and channel encoding level of each radio resource according to radio channel characteristics; Generating subscriber station information for the radio resource; Mapping subscriber station information for the radio resource to common control information; And downlink transmitting the allocated radio resource and the common control information.

The mapping of the common control information may include mapping modulation and channel encoding level information of each radio resource to the common control information; And mapping offset information of a time unit and a frequency unit of each radio resource to the common control information.

In addition, the subscriber station information may include identifier information of the subscriber station accessing each radio resource and the number information of the subscriber station.

In addition, the method for accessing a downlink radio resource according to an aspect of the present invention comprises the steps of: a subscriber station receiving a common control information block storing a radio resource and subscriber station information for the radio resource; Searching for a corresponding subscriber station identifier in the common control information block; Determining a demodulation and channel decoding level by reading a modulation and channel encoding level of a corresponding radio resource from common control information corresponding to the retrieved subscriber station identifier; Identifying a corresponding radio resource from common control information corresponding to the retrieved subscriber station identifier; And receiving data information corresponding to the subscriber station by accessing the identified radio resource by the determined demodulation and channel encoding method.

Here, the radio resource checking step may include reading symbol unit offset information and subcarrier offset information of the corresponding radio resource from the common control information.

In addition, the base station apparatus for allocating radio resources according to an aspect of the present invention allocates downlink data of subscriber stations using the same modulation and channel coding level to one radio resource, and information and modulation and channel information of the subscriber station. A base station controller having a radio resource allocator for mapping the coding level information to the common control information block; A digital signal transmitting apparatus for performing modulation and channel encoding on the radio resources allocated by the radio resource allocating unit at a designated same modulation and channel coding level; And an analog signal transmitting device for converting the modulated and channel coded digital signal into an analog signal and transmitting the same to a subscriber station.

The radio resource allocator may include a modulation level setting unit configured to set a modulation level of data to be allocated to a radio resource according to characteristics of a radio channel, and to map information of the level to a common control information block; A channel encoding level setting unit for setting a channel encoding level of data to be allocated to the radio resource according to a characteristic of a radio channel, and mapping the level information to a common control information block; A subscriber station setting unit for mapping a subscriber identifier assigned to the radio resource to a common control block; And an offset setting unit configured to set a position and a size on a frame of the radio resource as offsets in a symbol unit and a subcarrier unit and map the offset information to a common control information block.

In addition, the subscriber station apparatus according to an aspect of the present invention, an analog signal receiving device for receiving and converting an analog radio signal digital; A terminal control device having a common control information reading unit which reads the transmitted common control information and retrieves information of radio resources to be accessed by the subscriber station; And a digital signal receiver for performing demodulation and channel decoding according to the modulation and channel coding level of the radio resource retrieved by the common control information reading unit and receiving data information.

The common control information reading unit may include a subscriber station identifier retrieval unit for retrieving radio resource information including a subscriber station identifier from the common control information block; A modulation and coding level reading unit for reading modulation and coding level information of the found radio resource; And an offset information reader configured to read symbol unit offset information and subcarrier unit offset information of the found radio resource.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

A radio resource allocation method and apparatus according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

6 is a diagram illustrating radio resource allocation according to an embodiment of the present invention.

The radio resource according to the embodiment of the present invention includes a radio resource WM1 to WM8 having a two-dimensional rectangular structure and a common control information block CI including information on the allocated radio resource.

As described above, the radio resource blocks WM1 to Wm8 and the common control information block CI are formed in a two-dimensional structure of a plurality of subcarriers and a time division symbol. The radio resource blocks WM1 to WM8 each have the same modulation and channel coding levels, and include service information for a plurality of subscriber stations. Thus, each radio resource block includes a subscriber identifier. For example, the radio resource block WM5 includes a plurality of subscriber identifiers (SSID # 1, SSID # 3, SSID # 7, SSID # 8).

Meanwhile, the common control information block CI includes information on each of the radio resources WM1 to WM8 included in the frame. For example, the common information control information M1 to M8 indicates whether the subscriber identification information allocated to the radio resources WM1 to WM8 is included or not, and the common information control information M5 including the subscriber identification information indicates the radio resource ( WM5) has radio resource allocation information.

Accordingly, all the subscriber stations can receive the common control information block (CI), retrieve the radio resource information required by the subscriber station, and access only the radio resource.

However, in the actual implementation, as the terminal needs processing time until the terminal receives the information of the common control information block (CI) and reads the corresponding information, in the case of FIG. 6, the terminal is received at the same time as the common control information block. The radio resource WM1 should be buffered, and in some cases, the radio resources WM1, WM3, and WM4 should be buffered according to the performance of the terminal. This may increase the size of the buffer required by the terminal, for example, from the perspective of the terminal having its allocated resource block in WM1 (because the access to its allocated resource block is started after the reading of the common control information block is completed). Damage can also occur in terms of processing time. In addition, the common control information block including subscriber identification information for all radio resources may be disadvantageous in terms of efficient use of radio resources due to their increased size. Therefore, in consideration of the processing time required until the reception section of the terminal reads out the common control information block, the subscriber identification information for a part of the first half of the downlink radio resource is not included in the common control information block. In case of 6, only WM5 ~ WM8) may be transmitted including subscriber identification information.

At this time, the terminal receives the common control information block and checks whether the subscriber identification information is included after reading, accesses the radio resource blocks that do not include the subscriber identification information, and searches whether there is downlink data transmitted to the terminal. With respect to a radio resource block including subscriber identification information of a corresponding radio resource in the common control information block, the subscriber identification information may be read to retrieve only a radio resource block allocated to the common control information block.

Further, in the above example, if the terminal already has knowledge of the presence or absence of radio resource allocation information included in the common control information block (e.g., the subscriber identification information for WM1 to WM4 is always in the common control information block). The terminal always accesses the entire WM1 ~ WM4 directly (without reading the subscriber identification information from the common control information block) for the WM1 ~ WM4 and accesses the radio resource block assigned to itself. The WM5 to WM8 can be accessed only in the radio resource block assigned to the user according to the subscriber identification information allocated to each resource (WM5 to WM8) obtained through the common information control block.

7 is a diagram illustrating a configuration of common control information according to an embodiment of the present invention.

The common control information M5 of the radio resource WM5 includes modulation and channel coding level information F1 of the corresponding radio resource, offset information F2 in symbol units and subchannel units, number information of subscriber identifiers F3, and subscribers. Identifier information F4 is included.

The modulation and channel encoding level information F1 of the radio resource relates to the modulation and channel encoding information common to the radio resource WM5. As described above, the plurality of radio resources are allocated based on the same modulation and channel encoding information.

The offset information F2 of the symbol and subchannel relates to the offset on the vertical axis and the horizontal axis of the radio resource WM5. Accordingly, location information of the radio resource WM5 corresponding to the offset of the symbol unit and the sub channel unit is provided.

The subscriber identifier number information F3 indicates the number of subscriber stations using the corresponding radio resource WM5.

The subscriber identifier information F4 includes an identifier of a subscriber station using the corresponding radio resource WM5.

Accordingly, the common control information block (CI) is received by all subscriber stations of the downlink through a broadcast channel, and searches for a radio resource having its own subscriber identifier. When the subscriber has found a radio resource in which the identifier exists, the subscriber station reads the radio resource's position and modulation and channel encoding information to access the radio resource assigned to the subscriber. As shown in FIG. 6, since the radio resource includes subscriber identifiers for a plurality of service information, the subscriber station can receive only service information including its own subscriber identifier among the accessed radio resources.

8 is a block diagram showing the configuration of a base station of a radio resource allocation apparatus according to an embodiment of the present invention.

The base station 100 according to the embodiment of the present invention includes a base station controller 110, a digital signal transceiver 130, and an analog signal transceiver 140. The base station control apparatus 110 includes a radio resource allocation unit 120 that performs radio resource allocation, and the digital transceiver 130 includes a transmitter 131 for selectively performing a transmission / reception function and a receiver ( 132).

The radio resource allocating unit 120 includes services in the radio resource that have different connection identifiers in the same subscriber as those using the same modulation and channel coding to suit the quality of service (QoS) of packet data to be transmitted in downlink. Assign to a block of. In addition, the radio resource allocator 120 allocates packet data for each subscriber to each radio resource block at a modulation and channel encoding level allowed by the system in the same manner. Subscriber information, modulation, and channel encoding information of the allocated radio resources are mapped to a common control information block.

Meanwhile, the transmitter 131 transmits the modulation and channel encoding level information, symbol unit, and subchannel unit of the radio resource block in the frame in the common control information block so that the terminal can appropriately demodulate and decode the data in the received radio resource. The offset information and the number of subscriber identifiers assigned to the radio resource block and the identifier information of the corresponding terminal are modulated and encoded according to the modulation and channel coding levels.

The modulated and encoded radio resource block is transmitted to the subscriber station through the air by using the analog signal transceiver 140.

9 is a block diagram showing the configuration of a radio resource allocation unit of a base station according to an embodiment of the present invention.

The radio resource allocator 120 includes a modulation level setting unit 122, a channel encoding setting unit 123, a subscriber station setting unit 124, a symbol and subchannel offset setting unit 125, and a control unit 121. .

The modulation level setting unit 122 and the channel encoding setting unit 123 select the same modulation level and the channel encoding level according to the quality of service (QoS) policy and assign them to the same radio resource. For example, the modulation level may be selected from QPSK, 16-QAM, 32-QAM, etc. according to characteristics of the downlink physical channel (eg, signal-to-noise ratio). CTC and RM encoding methods can be selected. The modulation level setting unit 122 and the channel encoding setting unit 123 map the set modulation and channel encoding level information to the common control information block.

The subscriber station setting unit 124 assigns data included in the allocated radio resource and a subscriber identifier to be used in the common control information block so that the subscriber station can access itself through the common control information block during downlink. To identify a radio resource and to identify its own data among the radio resources.

The symbol and subchannel offset setting unit 125 designates a position and a size on the frame of the allocated radio resource. A radio resource can designate its two-dimensional size and position by specifying an offset of a symbol unit on a time axis and an offset of a subchannel unit (or subcarrier unit) on a frequency. In the embodiment of the present invention, the offset unit on the frequency axis is illustrated as a subchannel, but the offset unit on the frequency axis may be designated as a subcarrier unit. The offset information is also mapped to a common control information block to provide location information of a radio resource allocated to a subscriber station.

The controller 121 controls the radio allocation by controlling the modulation level setting unit 122, the channel encoding setting unit 123, and the subscriber station setting unit 124.

10 is a block diagram showing the configuration of a terminal of a radio resource allocation apparatus according to an embodiment of the present invention.

The terminal 200 according to the embodiment of the present invention includes a terminal control device 210, a digital signal transmission and reception device 230, and an analog signal transmission and reception device 240. The terminal control device 210 includes a common control information reading unit 220. The digital signal transceiver 230 includes a transmitter 231 and a receiver 232 for performing a function of transmitting / receiving a digital signal.

The common control information reading unit 220 reads common control information transmitted to all terminals through a broadcast channel and searches for radio resources to be accessed by the common control information reading unit 220. According to the reading result of the common control information reading unit 220, the terminal control device 230 controls the digital signal transmitting and receiving device 230, demodulates and decodes the data of the radio resource by a suitable demodulation and channel decoding method.

11 is a block diagram showing the configuration of a common control information reading unit according to an embodiment of the present invention.

The common control information reading unit 220 includes a subscriber station identifier searching unit 221, a modulation and coding level reading unit 222, an offset information reading unit 223, and a data information searching unit 224.

Upon receiving the common control information block, the terminal 200 first uses a subscriber station identifier searcher 221 of the common control information reader 220 to generate a radio resource including its own subscriber station identifier in the common control information block. Search for existence.

If there is a radio resource including its identifier, the modulation and coding level reading unit 222 reads modulation and coding level information of the radio resource from the common control information block. The modulation and coding level information is transmitted to the receiver of the digital signal transmission / reception apparatus and used for demodulation and decoding of radio resources.

The offset information reading unit 223 reads the offset of the subchannel unit (or the offset of the subcarrier unit) and the offset of the symbol unit to determine the location of the allocated radio resource.

When the location of the radio resource is determined, the data information search unit 224 searches for data information having its own subscriber identifier among data information for a plurality of subscribers in the radio resource. According to the search result, the terminal control device 210 controls the terminal to access the radio resource and data information allocated thereto.

By the above-described configuration, the terminal analyzes the information of the common control block having the characteristics of the broadcast information to determine whether there is a radio resource allocated to it, and acquires modulation and encoding level information of the radio resource to a level that is appropriate. The radio resources are demodulated and decoded. Therefore, the terminal does not need to check all of the transmitted radio resources, and the radio resources can also be operated according to the QoS policy without wasting transmission efficiency.

12 is a flowchart illustrating a method of allocating radio resources according to an embodiment of the present invention.

In step S10, the base station determines the downlink radio channel characteristics. Characterization of the radio channel may be performed through a MAC message (eg, a channel descriptor message) describing the characteristic of the physical layer.

In step S11, the base station adaptively determines the modulation and channel coding level according to the characteristics of the radio channel identified through the MAC message. For example, modulation and channel coding corresponding thereto are determined according to the signal-to-noise ratio found in the physical layer.

When the modulation and channel coding level is determined, a radio resource corresponding to the modulation and coding level is allocated (S12). The radio resource determines an offset in units of symbols and an offset in units of subchannels (or subcarriers) to determine a position and a size on a frame.

When the radio resource is allocated, the subscriber information on the allocated radio resource is generated and mapped to the common control information block (S13). When both the radio resource allocation and the subscriber information on the radio resource are mapped to the common control information block, the packet data is framed and transmitted in downlink (S14).

13 is a flowchart illustrating a method of accessing a downlink radio resource by a subscriber station according to an embodiment of the present invention.

When the subscriber station receives the common control information block transmitted through the downlink broadcast channel or the like, the subscriber station searches for the presence of its own subscriber identifier in the common control block (S20). The common control block includes subscriber information for each allocated radio resource according to the same modulation and channel coding level.

In step S20, when there is a common control block including its own subscriber identifier, the subscriber station reads the modulation and channel encoding levels of the radio resources corresponding to the common control information block, and receives the subscriber station to receive the same. The demodulation and channel decoding levels are selected (S21).

In addition, when the subscriber identifier is found, the subscriber station checks the location and size of the radio resource to which the information for the terminal is mapped (S22).

When the radio resource allocated to the subscriber station is allocated, the radio resource is accessed according to the selected demodulation and channel decoding method to retrieve and receive data allocated to the terminal (S23).

As can be seen in the above-described embodiment of the present invention, radio resource allocation is performed based on the same modulation and channel coding level, so that loss of radio resources can be prevented. Meanwhile, the subscriber station preferentially receives common control information to acquire information on the radio resource, acquires only information on the radio resource to be accessed, and accesses the radio resource. Accordingly, power is saved because there is no need to access all the radio resources, and this power saving supports high mobility in a battery-based wireless Internet system.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the above-described configuration of the present invention, the subscriber station transmits subscriber information to a common control information block when allocating downlink radio resources, and the corresponding subscriber station accesses only radio resources to which its packet data is allocated to search for information. It has a remarkable effect of enabling low power consumption of the terminal to increase battery use efficiency.

Claims (14)

A method of allocating a downlink radio resource in a wireless portable internet system, Determining a modulation and channel coding level of each radio resource according to a radio channel characteristic; Generating subscriber station information for the radio resource; Mapping subscriber station information for the radio resource to common control information; And Allocating a radio resource for a subscriber station by transmitting the allocated radio resource and the common control information in downlink Radio resource allocation method comprising a. The method of claim 1, The common control information mapping step, Mapping modulation and channel encoding level information of each radio resource to the common control information; And And setting a position and a size on a frame of each radio resource in an offset of a time unit and a frequency unit, and mapping the information about the offset to the common control information. The method of claim 1, And the subscriber station information includes identifier information of the subscriber station accessing each radio resource and the number information of the subscriber station. The method of claim 1, The common control information is a radio resource allocation method is transmitted to the subscriber station preferentially through a broadcast channel. The method of claim 2, The time unit is a data symbol unit, and the frequency unit is a subcarrier unit radio resource allocation method. A method of accessing a downlink radio resource in a wireless internet system, Receiving, by the subscriber station, a common control information block storing radio resources and subscriber station information for the radio resources; Searching for a corresponding subscriber station identifier in the common control information block; Determining a demodulation and channel decoding level by reading a modulation and channel encoding level of a corresponding radio resource from common control information corresponding to the retrieved subscriber station identifier; Identifying a corresponding radio resource from common control information corresponding to the retrieved subscriber station identifier; And Accessing the identified radio resource and receiving data information corresponding to the subscriber station by the determined demodulation and channel encoding method Wireless resource access method comprising a. The method of claim 6, The radio resource identification step, And reading the symbol unit offset information of the corresponding radio resource and the offset information of the subcarrier unit from the common control information. The method of claim 6, The common control information block is transmitted over a broadcast channel. The method of claim 6, In the receiving of the data information, the radio resource access method for receiving data information to which the identifier of the subscriber station is assigned from the accessed radio resource. In a downlink frame structure in a wireless portable internet system, It includes an identifier of the subscriber station for the allocated radio resources, information on the number of identifiers of the subscriber station, modulation and channel encoding information of the radio resource block, symbol unit offset information of the radio resource block and subcarrier unit offset information of the radio resource block. A common control information block; And A plurality of radio resource blocks each having the same modulation and channel coding level and including data information having the subscriber station identifier; Downlink frame structure comprising a. A base station apparatus for allocating radio resources in a wireless portable internet system, And a radio resource allocator for allocating downlink data of subscriber stations using the same modulation and channel coding level to one radio resource and mapping information of the subscriber station and modulation and channel coding level information to a common control information block. A base station controller; A digital signal transmitting apparatus for performing modulation and channel encoding on the radio resources allocated by the radio resource allocating unit at a designated same modulation and channel coding level; Analog signal transmitting apparatus for converting the modulated and channel coded digital signal to an analog signal and transmitting to the subscriber terminal Base station device comprising a. The method of claim 11, The radio resource allocation unit A modulation level setting unit for setting a modulation level of data to be allocated to a radio resource according to a property of a radio channel and mapping the level information to a common control information block; A channel encoding level setting unit for setting a channel encoding level of data to be allocated to the radio resource according to a characteristic of a radio channel, and mapping the level information to a common control information block; A subscriber station setting unit for mapping a subscriber identifier assigned to the radio resource to a common control block; And An offset setting unit configured to set a position and a size on a frame of the radio resource as offsets in a symbol unit and a subcarrier unit and map the offset information to a common control information block. Base station device comprising a. A subscriber station apparatus for accessing a radio resource in a wireless portable internet system, An analog signal receiver for receiving and converting an analog radio signal to a digital signal; A terminal control device having a common control information reading unit which reads the transmitted common control information to retrieve information of radio resources to be accessed by the subscriber station; And A digital signal receiver for performing demodulation and channel decoding according to a modulation and channel coding level of a radio resource retrieved by the common control information reading unit to receive data information; Subscriber terminal device comprising a. The method of claim 13, The common control information reading unit A subscriber station identifier retrieval unit for retrieving radio resource information including a subscriber station identifier from a common control information block in which radio resources and subscriber station information for the radio resources are stored; A modulation and coding level reading unit for reading modulation and coding level information of the found radio resource; And An offset information reading unit for reading symbol unit offset information and subcarrier unit offset information of the found radio resource; Subscriber terminal device comprising a.

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