KR101365751B1 - method for allocating CQI channel and storing CQI in wireless communication system and apparatus thereof - Google Patents

Abstract

The present invention relates to a method for managing channel quality information in a mobile communication system, a channel allocation method for transmitting the channel quality information, and an apparatus thereof.

When a terminal accesses a call to a base station in a mobile communication system, a CQI channel allocation for allocating channel quality information (CQI) is allocated to the terminal. In particular, a predetermined frame is modularized by the number of channel round-trip delay frames, and the CQI channel is allocated to transmit the CQI in a frame corresponding to the modularity value, so that as many terminals as possible can receive and use the CQI channel.

In addition, the CQI values transmitted through the allocated CQI channels are processed and stored in a moving-average method, thereby storing and managing CQIs reflecting past channel states. Therefore, call disconnection between the terminal and the base station can be prevented from occurring.

CQI, Channel Assignment, CQI Storage, Scheduling, Base Station, AMC

Description

A method for managing channel quality information in a mobile communication system, a method for allocating a channel for transmitting the channel quality information, and an apparatus thereof

1 is a schematic diagram showing an outline of a mobile communication system according to an embodiment of the present invention.

2 is a frame structure diagram of a wireless portable Internet according to an embodiment of the present invention.

3 is a structural diagram of a base station according to an embodiment of the present invention.

4 is a detailed structural diagram of the access traffic control apparatus shown in FIG.

5 is a structural diagram of a frame configuration information storage based on channel allocation according to an embodiment of the present invention.

6 is a structural diagram of a terminal information store for storing channel quality information for each terminal according to an exemplary embodiment of the present invention.

7 is a flowchart illustrating a channel allocation process according to an embodiment of the present invention.

8 is a timing diagram according to an embodiment of the present invention.

9 and 10 are flowcharts illustrating a process of storing channel quality information according to an embodiment of the present invention.

The present invention relates to a mobile communication system, and more particularly, to a method for managing channel quality information in a mobile communication system, a channel allocation method for transmitting the channel quality information, and an apparatus thereof.

Information about the radio channel state of a mobile terminal in a mobile communication system such as a wireless portable Internet system that provides high-speed mobility is used to determine an appropriate modulation and channel coding level (AMC level) for the terminal. This is very important because it is used as essential information. Therefore, the terminal should transmit channel quality information (hereinafter referred to as CQI) to the system every frame.

However, the wireless portable Internet system is a shared packet system in which all terminals serviced by one base station share and use the same radio resource. Therefore, resource allocation is required for transmitting data upwards for each frame. When transmitting control data requiring real time such as channel quality information and ranging information, if the control data is transmitted after receiving resource allocation, This can lead to poor overall system efficiency. Accordingly, there is a dedicated channel for transmitting control data requiring real time, such as channel quality information and lasing information. At this time, in order to increase the uplink traffic data, it is not possible to allocate a lot of uplink radio resources, that is, a CQI region, for transmitting real-time control data. Therefore, the number of terminals that can be allocated to the CQI region is limited.

In addition, when the terminal does not transmit the channel quality information to the base station or the base station does not receive the channel quality information transmitted from the terminal every frame, because the scheduling is performed based on the abnormal channel quality information that does not reflect the current channel status A call disconnection occurs between a terminal and a base station.

In addition, since the channel quality information is applied to the traffic data transmission after a predetermined delay frame than when the terminal reports the channel quality information to the base station through the CQI region in a predetermined frame, the accuracy at the time when the channel quality information is applied is reduced. have.

Accordingly, an aspect of the present invention is to solve a conventional problem, and to provide a channel allocation method and apparatus for allocating as many terminals as possible in a radio resource region for reporting channel quality information in a mobile communication system.

Another object of the present invention is to provide a method for efficiently storing and managing channel quality information provided from terminals.

In addition, the technical problem to be achieved by the present invention is to efficiently manage the channel quality information and apply to the scheduling, to prevent the loss of data transmitted to the terminal.

According to an aspect of the present invention, there is provided a channel allocation method for allocating a CQI channel for reporting channel quality information (CQI) to a terminal in a mobile communication system. Allocating a CQI channel for reporting a CQI to the terminal when the terminal connects to the base station; And providing a message to the terminal, the message including a CQI transmission module value indicating a resource location of the allocated CQI channel, wherein the assigning comprises: modularizing a predetermined frame into a channel round-trip delay frame number, and a modularization value. The CQI channel is allocated to transmit the CQI in a frame corresponding to the CQI channel.

In addition, the CQI storage method according to another aspect of the present invention, in the method for storing the CQI transmitted through the CQI channel from the terminal in a mobile communication system, a) when the channel type of the terminal is a diversity channel, the CQI channel Storing the transmitted CQI; And b) storing a value obtained by performing a moving average on the stored CQI value and the CQI values stored in the previous frame, as a CQI value of the corresponding frame.

In addition, the CQI storage method according to another aspect of the present invention, in the method for storing the CQI transmitted through the CQI channel from the terminal in a mobile communication system, a) when the channel type of the terminal is a band AMC (Adaptive Modulation Coding) channel Storing the CQI transmitted through the CQI channel for each band; And b) storing a value obtained by performing a moving average on the stored CQI values and the CQI values stored in the previous frame as the CQI value of the corresponding frame.

In addition, the CQI allocation apparatus according to another aspect of the present invention, in the channel assignment apparatus for performing CQI channel allocation for reporting channel quality information (CQI) to the terminal in the mobile communication system, the terminal is a base station A traffic resource management unit for allocating a CQI channel for reporting a CQI to the terminal when making a call connection with a mobile station; A radio channel manager including a frame configuration information storage according to the channel assignment, and a terminal information storage configured to store and manage a CQI transmitted through the allocated CQI channel; And a scheduler unit configured to perform scheduling based on the information stored in the terminal information store, wherein the radio channel manager module modulates the number of frames transmitted from the terminal by the number of channel round-trip delay frames, and the frame corresponds to a modular value. Only in the case of a frame, the CQI transmitted through the corresponding CQI channel is treated as the CQI of the terminal, and stored and managed.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 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 addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated. In addition, the term block described herein refers to a unit for processing a specific function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

1 is a view schematically showing the structure of a wireless portable Internet system according to an embodiment of the present invention.

The wireless portable Internet system basically includes a base station 100, 100 ′, a subscriber station 200 for wireless communication with the base station, routers 300 and 310 connected through the base station and a gateway, and an internet network.

In the wireless portable Internet system, even when the subscriber station 200 shown in FIG. 1 moves from a cell managed by one base station 100 to a cell managed by another base station 100 ', the data communication service is not interrupted by guaranteeing its mobility. It provides a, and supports the handover of the subscriber station 200 like a mobile communication service, and performs dynamic IP address allocation according to the movement of the subscriber station. Here, the wireless portable Internet subscriber station 200 and the base station (100, 100 ') may perform communication by Orthogonal Frequency Division Multiple Access (hereinafter referred to as OFDMA), but is not limited to this method. Do not.

2 is a diagram illustrating a frame structure of a wireless portable Internet system according to an embodiment of the present invention. As shown in FIG. 2, the frame is largely divided into the downward regions F1 to F5, the control regions F6 to F8, and the upward region F9, and is transmitted every predetermined period (for example, 5 ms).

The downlink region includes a downlink preamble (F1) indicating downlink synchronization and signal strength, a downlink map (DL_MAP) (F2) for transmitting downlink traffic information as a downlink usage code (DIUC) value, and uplink traffic information. HARQ (Hybrid) that delivers downlink traffic and uplink traffic information based on an uplink map (UL_MAP) (F3) that delivers a UIUC (Up Link Usage Code) value and a channel quality indicator (CQI) value Automatic Repeat request) MAP (F4), DL data burst (F5) to which the actual traffic is transmitted. Meanwhile, the uplink region is an area F9 through which the terminal transmits traffic designated by the uplink map UL_MAP.

The control region includes a CQI region (F6) reporting channel characteristics of a terminal in service, a HARQ region (F7) in which a terminal reports a CRC error in the physical layer, and performs a ranging function. It consists of an area F8. For example, 35 subchannels are used as the uplink control channel region of the control region. In this case, the ranging region uses 8 subchannels, the CQI region uses up to 20 subchannels, and the HARQ region is 9 Subchannels may be used.

When the reception quality is good between the terminal and the base station in the downlink data transmission interval, there is an AMC channel and a diversity channel used to transmit and receive a large amount of data at high speed by applying a modulation technique having high coding efficiency. The AMC channel is a set of subbands and is composed of a flexible number of symbols and subcarriers, and is a channel mainly used by terminals moving around at a low speed or terminals around the base station. The diversity channel uses fast or slow frequency hopping and is mainly used by fast-moving terminals or terminals in a cell boundary region. Accordingly, each terminal is assigned a diversity channel or AMC channel resource based on data characteristics to be transmitted, QoS requirements, terminal movement speed, and channel quality information. In general, when a terminal attempts initial access to a base station or newly enters through a handover from another base station, a diversity channel is allocated to the terminal by default, and a mode switching is performed at the request of the base station or the terminal, thereby providing an AMC channel. Can be assigned to a terminal. According to an embodiment of the present invention described later, a method of storing and managing channel quality information transmitted from a corresponding terminal is implemented differently depending on whether the terminal belongs to a diversity channel or an AMC channel. That is, when the channel type of the terminal is a diversity channel, a value obtained by performing a moving average on the CQI transmitted through the CQI channel and the CQI values stored in the previous frame is stored as the CQI value of the corresponding frame. When the channel type of the terminal is a band AMC channel, a value obtained by storing a CQI transmitted through the CQI channel for each band and performing a moving average with respect to the stored CQI values and the CQI values stored in the previous frame is a corresponding frame. Save as CQI value. This will be described in detail later.

3 illustrates a structure of a base station according to an embodiment of the present invention.

As shown in FIG. 3, the base station 100 according to an exemplary embodiment of the present invention includes a baseband processing system (BaseBand Subsystem: BBS) 10 that performs a radio section transmission / reception function with a terminal, traffic processing, and radio. With an Access Traffic Subsystem (ATS) 20 performing a link transmission and reception control function, an Access Controller Subsystem (ACS) 30 performing user management and cell management, and a router 300. Ethernet switch 40 to perform the transmission and reception.

While performing the traffic processing and the radio link transmission and reception control functions, in particular, the access traffic processing apparatus 20 for performing channel allocation and information storage management according to an embodiment of the present invention has the following structure.

4 is a diagram illustrating a structure of an access traffic processing apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the access traffic processing apparatus 20 according to an exemplary embodiment of the present invention performs an interface function, and in particular, an interface unit for performing an interface with a digital signal processing (DSP). (21), the scheduler unit (Packet Scheduling Block (PSCB) 22), the radio channel management block (RCMB) 23, also referred to as a packet data unit (aka PDU) to be transmitted in the radio section. Packet Classification Block (PHDB) 24 constituting the packet header, packet classification block for performing packet classification and mapping (eg, CID (Connection Identifier) is used) of the received packet : PCFB) 25, and a traffic resource management unit (TRMB) 26 for processing a control message transmitted from the access control device 30 and managing resources of the access traffic processing device.

In this case, the PCFB 25 classifies a received packet, and distinguishes terminals by using a CID representing a unidirectional MAC layer address identifying a connection for equivalent sibling layers in the MAC layer of the base station and the subscriber station. The identifier of is not limited to the CID.

The ATS 20 having such a structure performs functions such as packet retransmission, packet scheduling for efficient operation of radio resources, radio bandwidth allocation, ranging, and the like. In particular, according to an embodiment of the present invention, the RCMB 23 stores and manages channel quality information transmitted from the terminal, and the PSCB 23 performs scheduling based on the stored channel quality information. TRMB 26 allocates the CQI channel to the terminals.

Channel allocation related information and terminal related information for each frame are stored and managed as shown in FIGS. 5 and 6. 5 is a diagram illustrating a structure of a frame configuration information storage according to an embodiment of the present invention, and FIG. 6 is a diagram illustrating a structure of a terminal configuration information storage according to an embodiment of the present invention.

As shown in FIG. 5, an embodiment of the present invention includes a frame configuration information store (frameConfogInfo) for each cell, and the frame configuration information store stores information related to CQI channel allocation for each of a plurality of frames. In detail, the frame configuration information store (F) stores channel allocation information (cqiAllocInfo) F1 for a corresponding CQI region for each frame, and each channel allocation information includes the number of CQI channels (noCqiCH) (F11) used in the corresponding region. ), Information (atIndex: for example, terminal identifier, etc.) F12 about terminals corresponding to each CQI channel is stored. Accordingly, when a CQI channel is allocated to a corresponding CQI region of a predetermined frame, the number of CQI channels noCqiCH is increased and information (atIndex) of a terminal allocated to the corresponding CQI channel is stored.

If all terminals allocate the CQI channel to use the CQI region of every frame, the number of terminals that can use the CQI channel in one cell is limited to a very small number. Accordingly, according to an embodiment of the present invention, a predetermined frame allocated to the terminal is modularized by the number of channel reciprocating delay frames (CQICH_ROUND_TRIP_DELAY), and the CQI channel is allocated to transmit the CQI in a frame corresponding to the modularization value. Accordingly, the base station also identifies and stores and manages only the CQI transmitted through the CQI region of the frame corresponding to the module value as the CQI of the corresponding terminal. 5 illustrates that 10 is used as the number of channel reciprocating delay frames.

On the other hand, as shown in Figure 6, each terminal is provided with a terminal configuration information storage, the terminal configuration information storage (atInfo, A1) is CQI information for storing the CQI-related information for efficiently managing the CQI and CQI transmitted from the terminal Storage elements CqiInfo, A11. The CQI information storage element A11 may include a flag (cqiFlag) indicating whether to add information on the allocated CQI channel (CQI_CH_IE), a channel index (cqiChIndex) for identifying the allocated CQI channel, and a CQI channel corresponding to the index. Period for reporting CQI, duration in which the allocated CQI channel is maintained, number of received frames received (rxFrame), time average CQI (timeAvergecqi) indicating average value of CQI received in a normal channel, band AMC channel The minimum difference CQI (diffMinimumcqi) representing the minimum value of each band, that is, the minimum CQI, and the minimum time difference CQI (timeDiffMinmimumcqi) representing the minimum time average value of each band in the band AMC channel are included. It also includes an average CQI storage element (averageCqi) in which the average CQI is stored, and a deviation CQI storage element (differentialCqi) in which the deviation CQI is stored. Here, the number of received frames is a number indicating the number of received frames, and may be, for example, a frame number sequentially assigned to each frame. However, the present invention is not limited thereto.

Next, a CQI channel allocation method and a CQI storage and management method according to an embodiment of the present invention will be described based on this structure.

7 is a flowchart illustrating a CQI channel allocation method according to an embodiment of the present invention.

The base station 100 is provided from the terminal when the downlink synchronization is established with the terminal entering the cell, the initial ranging is performed, and then negotiate the basic capabilities for establishing the connection. Receive a basic capacity negotiation request (Subscriber Station's Basic Capability Negotiation Request, hereinafter referred to as SBC-REQ) message (S100 to S110). The SBC-REQ message is a MAC message transmitted by the terminal to the base station for negotiation of the basic capacity, and in response to the message, the base station transmits a basic negotiation capability response (Subscriber Station's Basic Capability Negotiation Response, hereinafter, SBC-RSP) message is sent to the terminal.

When the ATS 20 receives the SBC-REQ message, the ATS 20 transmits the SBC-REQ message to the ACS 30 through an internal message (msgAlapApLocalTransferRpt) (S120), and the ACS 30 stores the parameter stored in the SBC-REQ message. Based on the determination of the capability of the terminal 200 and accordingly transmits the terminal configuration message (msgAlapSSBasicCapabilitiesSetupCmd_id) including the parameter setting value for the terminal to the ATS 20 (S130).

The ATS 20 allocates a CQI channel to the corresponding terminal in association with the ACS 30. Specifically, the TRMB 26 of the ATS 20 allocates the CQI channel to the CQI region of the predetermined frame and includes the CQI transmission module value indicating the position of the CQI channel in the response message to the terminal configuration message to the ACS 30. To pass. In particular, in the case of channel allocation, an embodiment of the present invention modulates a predetermined frame into a channel round-trip delay frame number (CQICH_ROUND_TRIP_DELAY) and allocates a CQI channel to transmit a CQI in a frame corresponding to the modularization value. Accordingly, the base station also identifies and stores and manages only the CQI transmitted through the CQI region of the frame corresponding to the module value as the CQI of the corresponding terminal. In this way, by assigning several terminals to a predetermined CQI region using the CQI channel round-trip delay (the number of channel reciprocating delay frames), many terminals can be allocated to one base station.

 The ACS 30 transmits an internal local message to the traffic resource management unit 26 requesting to transmit an SBC-RSP message including the transmitted CQI transmission module value, and according to the internal local message, the traffic resource management unit 26 A SBC-RSP message, which is a response to the SBC-REQ message, is generated and transmitted to the terminal 200 (S140).

Thereafter, the terminal 200 transmits the CQI to the base station 100 through the CQI channel allocated in the CQI region of the frame based on the value of the CQI transmission module included in the SBC-REQ message (S150). In general, the terminal measures and reports an average CINR of the downlink signal-to-interference noise ratio (CINR) of the entire band measured during the downlink period, but is not necessarily limited thereto.

The RCMB 23 of the ATS 20 of the base station 100 stores the CQI, and in particular, stores the CQI using the moving average, and also stores the average CQI or the deviation CQI according to the characteristics of the channel to which the terminal belongs. (S150 to S160). The CQI storage related method will be described in more detail below. CQIs provided from the respective terminals are delivered to the RCMB 23 for every frame and stored and managed. The CQIs thus received are used as basic data in determining the AMC for up / down traffic at the PSCB 22. The PSCB 22 uses values stored in the average CQI storage element (averageCqi, A13) or the deviation CQI storage element (AdifferentCqi, A14) of the terminal information store A1 according to the CQI storage method described below. Scheduling for the terminals and determining an appropriate adaptive modulation and coding level (AMC level) (S170). Thereafter, the ATS 20 transmits downlink traffic data to the corresponding terminal 200 according to the determined AMC (S180).

Meanwhile, if a message (eg, DREG_CMD) requesting traffic release is transmitted from the terminal 200, the message is transmitted to the TRMB 26 of the ATS 20 (S190), and the TRMB 26 is an internal message (msgAlapApLocalTransferRpt). The received message (DREG_CMD) is transmitted to the ACS 30 by using (S200). Thereafter, the ACS 30 analyzes the received message DREG_CMD and transmits an internal local message msgAlapRestCmd to the traffic resource manager 26 requesting to release traffic for the terminal (S210). The TRMB 26 calls and executes a function for releasing the CQI channel for the corresponding terminal according to the internal local message, and performs CQI channel release (S220 to S230).

Next, a channel allocation process performed as described above will be described in detail based on a frame-based operation timing diagram.

8 is a frame based operation timing diagram of a base station according to an embodiment of the present invention. In particular, FIG. 1 illustrates timing information for applying a CQI transmitted from a terminal to a base station scheduling unit (PSCB) to determine AMC for downlink traffic transmission according to an embodiment of the present invention.

Referring to FIG. 8, one frame includes a plurality of slots. For example, five slots of a 1 msec clock may be configured to form a frame having a period of 5 msec (T1). The uplink frame data including the CQI according to an embodiment of the present invention may be received through a predetermined slot (for example, the third slot) of the i-th frame (T2). The uplink frame data thus received is transmitted through the baseband processing apparatus 10 and received by the ATS 20 in a predetermined slot (for example, the third slot) of the (i + 1) th frame (ST3). .

The CQI included in the received uplink frame data is transferred to and stored in the RCMB 23 of the ATS 20 according to an embodiment of the present invention, and is later downlinked from the (i + 2) th frame by the PSCB 22. It is used to determine the AMC of the traffic data (T4 to T5). The downlink traffic data determined by the AMC is transmitted to the baseband processing apparatus 10, which is a transmission / reception apparatus of the base station, in a predetermined slot (for example, 3 slots) of the (i + 2) th frame. The downlink traffic data modulated by the baseband processor 10 is transmitted to the terminal on the radio section in the (i + 3) th frame (T6). Through this timing diagram, it can be seen that the CQI transmitted from the terminal in the i-th frame according to the embodiment of the present invention is applied to the downlink traffic data transmitted from the (i + 3) th frame to the terminal.

According to an embodiment of the present invention, the CQI reported by the terminal is reflected in the scheduling, so that the terminal during the delay frame (referred to as the maximum number of CQI channel round-trip delay frames) required until the terminal receives the downlink traffic data according to the scheduling, Even when moving to a poor environment, the CQI reported from each terminal is stored using a moving average method so that scheduling can be performed based on the CQI including all past channel states, not the CQI indicating the current channel state. And manage.

Next, a method of storing the CQI provided from the terminal through the CQI channel allocated based on the channel allocation method as described above will be described in more detail.

9 and 10 are flows of a CQI storage method according to an embodiment of the present invention. In detail, FIG. 9 illustrates a method of storing a delivered CQI when the terminal corresponds to a diversity channel, and FIG. 10 illustrates a method of storing a delivered CQI when the terminal corresponds to a band AMC channel. This storage method is performed through the RCMB 23 of the ATS 20 according to an embodiment of the present invention, but is not necessarily limited thereto.

As shown in FIG. 9, for each frame, the current frame is modularized according to a set value to find corresponding channel allocation information. Specifically, when a predetermined frame is received, the frame number, that is, the frame number indicating the number of frames, is modularized into a set channel reciprocating delay frame number (CQICH_ROUND_TRIP_DELAY), and based on the value obtained according to the modularization, the frame configuration information store (frameConflgInfo) Find the channel assignment information from. For example, if the currently received frame number is 5 and the channel reciprocating delay frame number is 10, the channel allocation information cqiAllocInfo [5] is found based on the value 5 obtained by modularizing 5 into 10.

Next, the terminal related information (eg, terminal identifier) is retrieved from the found channel allocation information (eg, cqiAllocInfo [5]) (S200). Then, a corresponding terminal information store (eg, atInfo [0]) is found based on the retrieved terminal related information, for example, a terminal identifier (eg, atIndex [0]) (S210).

Next, the relevant information is stored in the frame received in the terminal information storage as shown in FIG. 6. That is, the CQI included in the CQI channel of the received frame is stored in the CQI information storage elements A11 and cqiINfo of the terminal information storage (S220), and other information for efficiently managing the CQI is also included in the CQI information storage element A11. The number of frames (rxframe), for example, which has received the CQI, is stored in step S230.

The average CQI is stored in an average CQI storage element (averageCqi) corresponding to a value obtained by modularizing the received frame number (or frame number) into a set value MAX_CQI_COUNT_PER_AT and modulating (S240).

 At this time, in the embodiment of the present invention, the average CQI is obtained by using a moving average so that the AMC can be determined even when the call is disconnected between the terminal and the base station by reflecting the past channel state. In more detail, a total average CQI (totalAverageCqi) is obtained by summing all the plurality of average CQIs provided and stored for each predetermined frame from the corresponding terminal (S250). Then, the obtained average CQI (totalAverageCqi) is divided by the set value and stored in the CQI information storage element A11 as a time average CQI (timeAvergecqi). In this case, for example, a value MAX_CQI_COUNT_PER_AT representing a space that the terminal can store maximum may be used as the set value, but is not limited thereto.

Information stored in the CQI information storage element including the time average CQI (timeAvergecqi) obtained as described above is used for later scheduling.

Next, a method of storing a CQI when the terminal corresponds to a band AMC channel will be described.

In the AMC channel allocation, subcarriers of a specific frequency band adjacent to each other are grouped into one subband, and resources are allocated to the terminal in subband units. Hereinafter, the average CINR values of the " selected upper band " or the average CINR values of the entire subbands are reported to the base station as CQI. In general, at the first report, the physical channel number of the selected upper bands and the average CINR values of all subbands are reported, and only the average CINR fluctuation values of the selected upper bands are reported as CQIs. That is, the average CINR increase and decrease values of the selected upper bands are periodically reported. For example, if the increment value is expressed as "1 (1 dB increase)" or "0 (1 dB decrease)", if the field value of CQI is "10110", the selected upper band, that is, the first, third, and The fourth band indicates that the average CINR value is increased by 1 dB compared to the previous frame, and the second and fifth bands indicate that the average CINR value is decreased by 1 dB.

As shown in the attached FIG. 10, the same number of frames as the CQI storage method for the above diversity channel is modularized into the number of channel reciprocal delay frames (CQICH_ROUND_TRIP_DELAY) for each frame, and the frame is configured based on the values obtained according to the modularization. The channel allocation information is found from the information store (frameConflgInfo) (SS300). The terminal identifier is found by searching the found channel allocation information, and the corresponding terminal information store A1 is found using the terminal identifier (S310).

Next, since the channel type of the terminal is a band AMC channel, the CQI reported through the CQI channel is stored in the CQI storage element (cqInfo), and a minimum difference CQI (diffMinimumcqi) representing the minimum CQI value of each band in the AMC channel is determined by the terminal information. The storage is stored in the CQI information storage element A11 of the storage A1 (S320).

 At this time, in the embodiment of the present invention, the minimum CQI is obtained by using a moving average so that the AMC can be determined even when the call is disconnected between the terminal and the base station by reflecting the past channel state.

Specifically, each bit of the received and stored CQI is examined to determine whether the values are “1” or “0” to determine whether the CINR of each band is increased or decreased compared to the previously provided CQI. According to the determination result, the deviation CQI (differentialcqi) of the deviation CQI storage element is increased or decreased (S330).

The deviation CQI and the minimum difference CQI changed by the next increase or decrease are compared (S340). When the changed deviation CQI is smaller than the minimum difference CQI, the changed deviation CQI is set as the minimum difference CQI (S350 to S360). On the other hand, if the changed deviation CQI is larger than the minimum difference CQI, the above steps S340 to S350 are repeated as many as the set number. In this case, a value MAX_CQI_COUNT_PER_AT representing the maximum storage space of the terminal may be used, but is not limited thereto.

After the above process, the minimum CQI is obtained by using a moving average, and then the average value of the obtained minimum difference CQI (diffMinimunCqi) and the existing minimum time difference CQI (timeDiffminimunCqi) is obtained and stored as the minimum time difference CQI (timeDiffminimunCqi). (S370). The obtained minimum difference diffMinimunCqi is stored in the CQI information storage element A11 of the terminal information store A1 (S380).

The method described above may be implemented in the form of a program stored in a computer-readable recording medium. The recording medium may include any kind of recording device that stores data that can be read by a computer. For example, a CD-ROM, a magnetic tape, a floppy disk, and the like may be used. Included is implemented in the form of).

Although the present invention has been described with reference to the most practical and preferred embodiments, the present invention is not limited to the above disclosed embodiments, but also includes various modifications and equivalents within the scope of the following claims.

According to the above-described embodiments, when allocating a CQI channel in a mobile communication system, by assigning several terminals to a predetermined CQI region using a CQI channel round trip delay, many terminals can be allocated to one base station. The number of subscribers per party can be increased.

In addition, by storing and managing the CQI value transmitted from each terminal by the moving average method, scheduling is performed based on the CQI reflecting the past channel information even when the radio resources are allocated using the CQI value incorrectly transmitted by the terminal. Is performed. Therefore, the case where the call with the terminal is disconnected can be prevented.

Claims (14)

In a channel allocation method for allocating a CQI channel for reporting channel quality information (CQI) to a terminal in a mobile communication system, Allocating a CQI channel for reporting a CQI to the terminal when the terminal connects to the base station; And providing a message including a CQI transmission module value indicating a resource location of the allocated CQI channel to the terminal. Including, The allocating may include: modulating a predetermined number of frames into a number of round-trip delay frames and allocating the CQI channel to transmit a CQI in a frame corresponding to a modularization value, wherein the CQI transmission module value indicates the modularity value. Channel assignment method. The method of claim 1, Receiving, by the base station, a CQI through a CQI channel from the terminal in a predetermined frame; The base station modularizes the number of frames of the frame by the number of channel round trip delay frames, and stores and manages the CQI transmitted through the corresponding CQI channel as the CQI of the terminal only when the frame corresponds to a modular value. Channel assignment method. The method according to claim 1 or 2, After the session setup with the terminal is completed, if a basic negotiation capability request message is received from the terminal requesting negotiation of the basic capacity, the CQI channel allocation is performed for the terminal, and the CQI transmission module value based on the channel allocation is performed. Channel allocation method for transmitting to the terminal included in the negotiation capability response message. The method according to claim 1 or 2, Releasing a CQI channel allocated to the terminal when a message requesting release of traffic is received from the terminal. In a method for storing a CQI transmitted through a CQI channel from a terminal in a mobile communication system, a) storing the CQI transmitted through the CQI channel when the channel type of the terminal is a diversity channel; And b) storing a value obtained by performing a moving average on the stored CQI value and the CQI values stored in the previous frame as the CQI value of the corresponding frame; Including, When a predetermined frame is received, the current frame number is modularized into the number of channel reciprocating delay frames, and a corresponding frame configuration information store based on a value obtained by the modularization--the frame configuration information store stores information related to CQI channel allocation for a plurality of frames. Retrieving corresponding channel allocation information from stored; And Searching for terminal related information from the found channel allocation information and finding a terminal information store corresponding to the found information, wherein the terminal information store stores CQI related information transmitted from the corresponding terminal; More, B) extracting and using CQI values stored in a previous frame from the terminal information store and storing and managing a value obtained according to a moving average in the terminal information store. In the method for storing the CQI transmitted through the CQI channel from the terminal in the mobile communication system, a) storing the CQI transmitted through the CQI channel for each band if the channel type of the terminal is a band Adaptive Modulation Coding (AMC) channel; And b) storing the values obtained by performing a moving average on the stored CQI values and the CQI values stored in the previous frame as the CQI values of the corresponding frame. CQI storage method comprising a. The method of claim 6, wherein When a predetermined frame is received, the current frame number is modularized into the number of channel reciprocating delay frames, and a corresponding frame configuration information store based on a value obtained according to the modularization--the frame configuration information store stores information related to CQI channel allocation for a plurality of frames. Retrieving corresponding channel allocation information from stored; And Searching for terminal related information from the found channel allocation information and finding a terminal information store corresponding to the found information, wherein the terminal information store stores CQI related information transmitted from the corresponding terminal; More, B) extracting and using CQI values stored in a previous frame from the terminal information store and storing and managing a value obtained according to a moving average in the terminal information store. The method of claim 7, wherein The frame configuration information store includes a plurality of channel allocation information for a corresponding CQI region for each frame, and each channel allocation information includes information about the number of CQI channels used in the corresponding region and terminals corresponding to each CQI channel. How to save CQI. The method of claim 7, wherein The CQI storage method comprising the CQI information storage element including the CQI transmitted from the terminal and CQI-related information for efficiently managing the CQI. In a channel allocation apparatus that performs CQI channel allocation for reporting channel quality information (CQI) to a terminal in a mobile communication system, A traffic resource manager for allocating a CQI channel for reporting a CQI to the terminal when the terminal connects to a base station; A radio channel manager including a frame configuration information storage according to the channel assignment, and a terminal information storage configured to store and manage a CQI transmitted through the allocated CQI channel; Scheduler to perform scheduling based on the information stored in the terminal information storage Including, The radio channel manager module modulates the number of frames of the frame transmitted from the terminal by the number of channel round-trip delay frames, and the frame is a modularization value, wherein the modularization value is a CQI transmission module value corresponding to the CQI channel allocated to the terminal. A channel allocation apparatus for processing, storing and managing a CQI transmitted through a corresponding CQI channel as a CQI of the terminal only in a frame corresponding to the frame. The method of claim 10, The frame configuration information store includes a plurality of channel allocation information for a corresponding CQI region for each frame, and each channel allocation information includes information about the number of CQI channels used in the corresponding region and terminals corresponding to each CQI channel. Channel assignment device. The method of claim 10, wherein The terminal information store includes a CQI information storage element including a CQI transmitted from the terminal and CQI related information, an average CQI or a deviation CQI for efficiently managing the CQI. The method according to any one of claims 10 to 12. When the channel type of the terminal is a diversity channel, the wireless channel manager stores a CQI transmitted through the CQI channel and performs a moving average on the stored CQI values and the CQI values stored in the previous frame. Channel allocation device to store the CQI value of the frame. The method according to any one of claims 10 to 12. When the channel type of the terminal is a band AMC channel, the wireless channel manager stores a CQI transmitted through the CQI channel for each band and performs a moving average on the stored CQI values and the CQI values stored in the previous frame. Channel allocation apparatus for storing the obtained value as the CQI value of the frame.

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