WO2010024578A2 - Procédé permettant de vérifier les informations de qualité de la voie et station de base permettant l'exploitation de ce procédé - Google Patents

Procédé permettant de vérifier les informations de qualité de la voie et station de base permettant l'exploitation de ce procédé Download PDF

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WO2010024578A2
WO2010024578A2 PCT/KR2009/004738 KR2009004738W WO2010024578A2 WO 2010024578 A2 WO2010024578 A2 WO 2010024578A2 KR 2009004738 W KR2009004738 W KR 2009004738W WO 2010024578 A2 WO2010024578 A2 WO 2010024578A2
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cqi
received
base station
terminal
cqis
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PCT/KR2009/004738
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Korean (ko)
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WO2010024578A9 (fr
WO2010024578A3 (fr
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전형준
이동관
김재형
변지영
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주식회사 포스데이타
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Publication of WO2010024578A2 publication Critical patent/WO2010024578A2/fr
Publication of WO2010024578A3 publication Critical patent/WO2010024578A3/fr
Publication of WO2010024578A9 publication Critical patent/WO2010024578A9/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for checking channel quality information (CQI) of a portable Internet system and a base station supporting the same.
  • CQI channel quality information
  • the terminal measures the quality of a wireless channel, generates channel quality information (hereinafter referred to as "CQI"), and periodically transmits the generated CQI to the base station.
  • CQI channel quality information
  • the base station After checking the CQI received from the terminal, the base station applies data modulation and coding according to the channel state of the terminal by using an adaptive modulation and coding (AMC) scheme. .
  • AMC adaptive modulation and coding
  • the AMC scheme refers to a data transmission scheme for improving data transmission efficiency of the entire cell by determining a modulation scheme and a coding scheme of different data channels according to channel conditions between the base station and the terminal.
  • the AMC scheme has a plurality of modulation schemes and a plurality of coding schemes, and modulates and codes a data channel signal by combining the modulation schemes and coding schemes.
  • a combination of the modulation schemes and coding schemes is called a Modulation and Coding Scheme (MCS), and a plurality of MCS levels from level 1 to level N may be defined according to the number of MCSs.
  • MCS Modulation and Coding Scheme
  • the AMC scheme is to adaptively determine the MCS level according to the channel state between the base station and the terminal to improve the overall system efficiency.
  • the IEEE 802.16 standard does not adopt a method for checking and correcting an error such as a cyclic redundancy check (CRC) when the terminal transmits a CQI to a base station. Therefore, it is not possible to check whether the CQI received from the base station matches the CQI transmitted from the terminal, that is, whether the CQI received from the base station can be trusted, and to provide a communication service when an error occurs in the CQI first reported from the terminal to the base station. There is a difficult problem.
  • CRC cyclic redundancy check
  • the MCS level lower than the channel state of the terminal when the MCS level lower than the channel state of the terminal is applied, the data transmitted from the base station can be received and decoded by the terminal, but there is a problem in that the data transmission efficiency is lower than when applying the MCS level suitable for the channel state.
  • the present invention has been made in view of the above-described problems, and it is a technical object of the present invention to provide a channel quality information checking method capable of detecting an error in received channel quality information (CQI) and a base station supporting the same.
  • CQI channel quality information
  • the present invention is to solve the above-described problem, by selecting a reliable CQI from the received CQI to apply the MCS level according to the channel state, channel quality information confirmation method that can improve the data transmission efficiency and the same It is another technical problem to provide a supporting base station.
  • the present invention is to solve the above-described problem, and to provide a channel quality information checking method capable of transmitting and receiving CQI through a method capable of error detection and correction when the received CQI is unreliable, and a base station supporting the same. It is another technical task.
  • a method for confirming channel quality information is a method for confirming channel quality information received from a terminal.
  • the channel quality information (CQI) received at a predetermined frame period from a terminal is provided.
  • a difference between a physical CINR value of a first CQI received at a current time point and a physical CINR value of a second CQI received in a previous reception period is previously determined.
  • a method for confirming channel quality information (CQI) for receiving an OFDMA wireless communication system Classifying the CQI information type according to a code value; Determining whether the CQI satisfies a valid condition according to the CQI information type; And discarding the occasional CQI when the CQI does not satisfy the valid condition.
  • CQI channel quality information
  • the base station for providing a wireless communication service to the terminal, an error of the CQI based on a reporting rule according to the characteristics of the information type of the CQI received from the terminal
  • a CQI checking unit for determining whether to determine whether to apply the system to the CQI according to a determination result
  • An MCS setting unit for setting an MCS level applied to the terminal according to the CINR from the CQI checking unit;
  • the present invention according to the embodiment can improve the overall data transmission efficiency of the system by selectively applying a reliable CQI among the received CQIs.
  • the entire data transmission of the system can be received by receiving a reliable physical CINR from the terminal through a message to which an error detection and correction scheme is applied.
  • the efficiency can be improved.
  • the unreliable CQI may be discarded from among the received CQIs, thereby preventing the performance degradation of the system due to the system application of the error-prone CQI.
  • FIG. 1 is a diagram illustrating a base station according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a configuration of the CQI control unit shown in FIG. 1.
  • FIG. 2 is a diagram illustrating a configuration of the CQI control unit shown in FIG. 1.
  • 3 to 8 illustrate CQI messages.
  • CQI channel quality information
  • CQI channel quality information
  • FIGS. 12 to 14 are diagrams illustrating an error checking method of physical CINR included in channel quality information (CQI) from a terminal.
  • CQI channel quality information
  • the present invention relates to a method for confirming channel quality information that can improve data transmission efficiency in a mobile Internet system and a base station supporting the same.
  • the present invention relates to an unreliable CQI by checking whether an error of a CQI continuously received from a terminal in the configuration of a base station Will be described in detail with respect to the CQI control unit that discards the card, and selects and applies a reliable CQI, and a detailed description of the other components will be omitted.
  • a reliable CQI and an unreliable CQI are distinguished from a plurality of CQIs consecutively received using a characteristic of a CQI in a MAC layer, and a reliable CQI is selectively applied.
  • the base station according to an embodiment of the present invention, as shown in Figure 1, the band signal processor 110, the transmitter 120, the receiver 130, the antenna 140, the scheduler 150 and the CQI controller 200 ).
  • the scheduler 150 determines, based on feedback information transmitted from a plurality of user terminals, which rules to distribute available radio resources to each terminal, and for each frame, the rules of the user.
  • the subchannels are allocated and managed in the entire burst region of the uplink subframe and the downlink subframe of the current frame for data transmission and reception. That is, after finding the channel of optimal performance for each user terminal, scheduling is performed such that the channel of optimal performance is allocated to the user terminal.
  • the scheduler 150 may include a burst allocator 155 for allocating data bursts according to scheduling.
  • the burst allocator 155 sequentially allocates downlink data bursts, and the size of the allocated data bursts is determined in consideration of the size of the data to be transmitted, the channel state, and the like.
  • the data burst to be allocated is assigned to a two-dimensional region defined by time and frequency within each subframe region.
  • the receiver 130 converts signals received through the antenna 140 into baseband signals. For example, the receiver 130 removes and amplifies the noise from the above-described signal for data reception by the base station 100, down converts the amplified signal into a baseband signal, and digitizes the down-converted baseband signal.
  • the band signal processor 110 extracts data bits from the digitized signal from the receiver 120 to perform demodulation, decoding, and error correction.
  • the received information is transmitted to an adjacent wired / wireless network (not shown) through an interface (not shown) or transmitted to user terminals serviced by the base station 100 through a transmission path.
  • the band signal processor 110 encodes input data and control information in the transmission path and outputs the encoded data and control information to the transmitter 120.
  • the transmitter 120 modulates the data burst allocated by the burst assigner 155 of the scheduler 150, that is, the encoded voice, data, or control information into a carrier signal having a desired transmission frequency or frequencies, and the modulated carrier wave.
  • the signal is amplified to a level suitable for transmission and propagated to the air through the antenna 140.
  • Information about the transmitted data burst is defined in the downlink information element DL_MAP_IE and the uplink map information element UL_MAP_IE in the map message area.
  • the base station 100 may include a map message generator (not shown) that generates a map message in a map message region of a frame based on data burst allocation information (scheduling information).
  • a map message generator (not shown) that generates a map message in a map message region of a frame based on data burst allocation information (scheduling information).
  • An OFDMA frame of a portable Internet system is composed of a MAP message area including a configuration information of a frame, a downlink subframe, and an uplink subframe.
  • the map message generated by the map message generator is composed of a downlink map (DL_MAP) message for downlink and an uplink map (UL_MAP) message for uplink and is allocated to a map message area of a frame.
  • DL_MAP downlink map
  • UL_MAP uplink map
  • the downlink map (DL_MAP) message includes information indicating which downlink data bursts transmitted from the base station 100 are data of which user terminal and in which region the data burst of a specific user terminal is located in a downlink frame. .
  • the uplink map message includes information indicating in which region the uplink bursts transmitted by the user terminals are located in the uplink frame.
  • the base station 100 needs to receive a CQI feedback from the terminal to know the channel state of the terminal, and the base station allocates a CQI channel (CQICH) to the terminal to receive the CQI feedback from the terminal. give.
  • the terminal generates a CQI by measuring the quality of the radio channel, and periodically transmits the generated CQI to the base station through a CQI channel (CQICH) allocated from the base station (for example, every 1 to 8 frames).
  • the base station 100 provides a communication service to the terminal by setting a power mode, an MCS level, a MIMO mode, etc. applicable to the terminal according to the contents of the CQI received from the terminal.
  • the transmission and reception of the CQI does not adopt a method of checking and correcting an error, and the physical layer decodes the radio signal received from the terminal into a digital signal and thus is received by the base station 100. CQI error can not be confirmed.
  • a reliable CQI and an unreliable CQI are distinguished from among a plurality of CQIs continuously received by using characteristics of the CQI in the MAC layer. Thereafter, unreliable CQIs are discarded, and reliable CQIs are selectively applied to improve data transmission efficiency.
  • the CQI received and received from the UE at the base station may be applied by transmitting and receiving CQIs through a method capable of error checking and correcting a message (for example, a REP_REQ / REQ_RSP message).
  • the CQI controller 200 includes a CQI checker 210, a storage 220, a counter 230, a message generator 240, and an MCS setup unit 250. do.
  • the CQI checking unit 210 checks the contents of the CQI received from the terminal, and whether the terminal or the base station 100 supports the items (eg, MIMO mode, AMC, MDHO, FBSS) included in the received CQI. Check whether or not. In addition, it is checked whether the received CQI satisfies a preset rule (eg, feedback cycle, message reception order, CQI fluctuation up fluctuation range and CQI fluctuation down fluctuation range). Then, according to the result of checking whether the rule is satisfied, the untrusted CQI is discarded and the trusted CQI is selectively applied.
  • a preset rule eg, feedback cycle, message reception order, CQI fluctuation up fluctuation range and CQI fluctuation down fluctuation range.
  • the checker 210 cannot trust all of the continuously received CQIs, and if the quantity of the discarded CQI exceeds the preset amount, the average Physical CINR values of the discarded CQIs stored in the storage 220 are previously set. Check that the set fluctuation range (downward fluctuation range and upward fluctuation range) is satisfied.
  • the discard CQI is set as a reliable CQI and applied to the system.
  • the physical CINR is received from the terminal using the message.
  • the received physical CINR since the physical CINR received through the REP_REQ / RSP message is received and reliably received through a method for checking and correcting an error, the received physical CINR may be applied as a CQI.
  • the CQI includes Physical CINR information, Effective CINR information, Anchor BS report, MIMO mode information, Extended rtPS bandwidth request, Indication Flag, and Band AMC information, as shown in FIGS. 3 to 8.
  • the CQI represents 6 bits of information, and the 6 bits of information are coded into 6 bytes and transmitted to the base station 100.
  • the physical layer of the base station 100 converts a radio signal received from the terminal into a digital signal, and extracts and decodes data bits from the digital signal. At this time, the CQI received from the terminal to the base station 100 is decoded into 6 bits.
  • the Physical CINR information shown in FIG. 3 represents information on a carrier to interference and noise ratio (CINR) of a channel measured by a terminal, using 5 bits among all 6 bits (0b0XXXXX) -3dB to 28dB Physical Represents a CINR.
  • the characteristic of the Physical CINR is that the first bit of the six bits is always fixed to "0", and represents 32 Physical CINRs using five bits except the first bit.
  • the physical CINR value is calculated by Equations 1 and 2 below, and during a plurality of frames for each period (eg, 1, 2, 4, 8 frames) in which a CQI including Physical CINR information is reported ( For example, the average value of the CINR values measured in 16 frames) is coded and transmitted from the terminal to the base station 100.
  • Equations 1 and 2 ⁇ denotes a reflection ratio of Physical CINR that determines how much the Physical CINR value measured in one frame is reflected in the average Physical CINR value, for example, the average Physical CINR for 16 frames.
  • the physical CINR of the current frame is reflected by 1/16 in the average physical CINR.
  • the physical CINR is changed between -3dB and 28dB according to the change in the channel state of the frame.
  • ⁇ is set to “1”
  • the channel state of each frame is reflected in the physical CINR value of the CQI and reported continuously.
  • Variation in the physical CINR value between the CQIs may be large.
  • the average Physical CINR value for 16 frames is calculated, and the calculated average Physical CINR value is reported to the base station.
  • the fluctuation range in the physical CINR values between the CQIs becomes smaller than when the ⁇ is set to “1” so that the average physical CINR values among the continuously received CQIs fluctuate within a certain range (downward fluctuation range and upward fluctuation range). Will be.
  • ⁇ is set to “1/16” and the CQI is reported to the base station every 8 frames.
  • the average physical CINR values of the CQIs received at were changed within the range of -2dB downward fluctuation to + 6dB upward fluctuation. For example, if the average Physical CINR value of the CQI reported to the base station in the previous period (n period) is 5dB, the average Physical CINR value of the CQI reported to the base station at the present time point (n + 1 period) is at least 3dB to maximum It may have a value of 11 dB.
  • the received CQI is 5 dB
  • the average Physical CINR value of the CQI reported to the base station in period n + 1 is less than 3 dB or exceeds 11 dB
  • this is the received CQI. This means that an error has occurred.
  • the corresponding CQI is discarded and the CQI applied to the previous period (n period) is maintained.
  • the previously applied CQI means a CQI applied to the system because it is determined to be reliable among the first received CQI or the continuously received CQI.
  • the present invention is to limit the method of confirming the channel quality information that can determine the error of the CQI received from the terminal by using the feature that the average physical CINR value of the CQI fluctuates within a certain range and limits the base station supporting the same.
  • the above-described average physical CINR downward fluctuation range and upward fluctuation range may be changed according to the moving speed of the terminal, the channel environment, and the ⁇ value.
  • the effective CINR information illustrated in FIG. 4 represents MCS information applicable to the terminal, and represents the MCS of QPSK 1/2 repetition 6 to 64QAM 5/6 using 4 bits among all 6 bits (0b00XXXXX).
  • the characteristic of the effective CINR is that the first and second bits of the six bits are always fixed to "0", and the effective CINR information is represented by using four bits except the first and second bits.
  • the CINR CQI representing the Physical CINR information and the Effective CINR information has a feature that the first bit of the 6 bits is always fixed to “0” as described above. For example, if a check result of the CQI confirming unit 210 indicates that the first bit of the received CQI is set to “1” in the CQI feedback cycle in which the Physical CINR and the Effective CINR are reported, an error occurs in the received CQI. It means. In this case, since the received CQI is not reliable, the CQI is discarded and the previously applied CQI is maintained.
  • the Anchor Base Station (BS) report shown in FIG. 5, is transmitted to the base station 100 when a macro diversity handover (MDHO) or fast BS switching (FBSS) is required.
  • the feature of the Anchor BS report is that the first bit of the six bits is always fixed at "1" and the second bit is always fixed at "0". That is, information about macro diversity handover or fast base station switching is indicated by using (0b10XXXXX) four bits except for the first and second bits.
  • the CQI received from the terminal is used. If the above information is included, this means that an error has occurred in the CQI received from the UE. In this case, since the CQI check unit 210 cannot trust the received CQI, it discards the corresponding CQI.
  • MDHO macro diversity handover
  • FBSS fast BS switching
  • the MIMO mode information shown in FIG. 6 indicates a MIMO mode (for example, STTD and SM) applicable to the terminal.
  • the characteristic of the MIMO mode information is that the first bit of the six bits is always fixed to "1". That is, MIMO mode information applicable to the UE is indicated by using five bits except the first bit (0b1XXXXX).
  • the CQI check unit 210 since the CQI check unit 210 cannot trust the received CQI, it discards the corresponding CQI.
  • the bandwidth width ratio (BWR) information illustrated in FIG. 7 includes Extended rtPS bandwidth request and Indication Flag Feedback information.
  • the biggest feature of this BWR is that it cannot be received continuously.
  • the CQI is received every 8 frames, if the BQ is included in the CQI received in the previous period (n frames), the CWR received in the current period (n + 8 frames) may not include the BWR.
  • the CQI received by the CQI check unit 210 includes the BWR in the CQI received in the previous cycle, but the CQI in the current cycle includes the BWR, the CQI received in the current cycle is not reliable, so the CQI check is performed.
  • the unit 210 processes the corresponding CQI.
  • the BWR (Band Width Ratio) information is fixed to “1” from the first to third bits among six bits, and the extended rtPS bandwidth request and Indication Flag Feedback information can be obtained using the remaining three bits (0b111XXX). Indicates.
  • the band AMC transition information includes information on switching from a normal subchannel to an AMC, switching from an AMC to a basic subchannel, and switching an AMC band.
  • the biggest feature of the band AMC transition information is that the order of transmission and reception of messages is determined.
  • a procedure for requesting the AMC mode change using the Enhanced Band AMC Report TLV of the REP_REQ / RSP message must be performed by the terminal or the base station.
  • the received CQI does not match the transmission / reception order of the band AMC transition information, it means that an error has occurred in the CQI received from the UE. In this case, since the CQI check unit 210 cannot trust the received CQI, it discards the corresponding CQI.
  • the CQI, ie, the discarded CQI, which is determined to be unreliable according to the CQI confirming unit 210 is not immediately discarded and is stored in the storage unit 220 up to a predetermined quantity.
  • the diskette CQI stored in the storage unit 220 is used as the basis for the confirmation when additional confirmation of the CQI trust is required.
  • the number of diskette CQIs stored in the storage unit 220 is variable. In the present invention, for example, the number of diskette CQIs stored in the storage unit 220 is set to three.
  • the counter 230 counts the quantity of the discarded CQI and the quantity of the discarded CQI stored in the storage unit 220, and provides counting information to the CQI confirming unit 210.
  • the message generator 240 may not trust all received CQIs.
  • the base station 100 After the applied message (eg, REP_REQ / RSP message), the base station 100 generates a message so that the reliable physical CINR can be received from the terminal.
  • the MCS setting unit 250 sets the MCS according to the CINR information included in the CQI applied to the system when the CQI confirming unit 210 confirms that the received CQI is reliable.
  • the base station 100 uses a MAC layer (CQI) of reliable CQI and unreliable CQI among a plurality of CQIs continuously received by using characteristics of the CQI received from the UE. Layers, and by applying reliable CQI can improve the overall data transmission efficiency of the system. In addition, when all the continuously received CQIs are unreliable, reliable physical CINRs can be received from the terminal through a message to which an error detection and correction scheme is applied, thereby improving overall data transmission efficiency of the system.
  • CQI MAC layer
  • the CQI control unit 200 is described as being included in the base station 100 as an independent component, but the CQI control unit 200 is integrated into other components (eg, the scheduler) of the base station 100. Can be implemented.
  • CQI channel quality information
  • CQI channel quality information
  • the method for checking whether the received CQI is a Physical CINR or an Effective CINR is to check whether the first bit is 0 out of 6 bits, and then check whether the second bit is 0 out of 6 bits. Therefore, it is confirmed whether the effective CINR.
  • the first bit of six bits is 0, that is, all 32 types (2 ⁇ 5) represented by 5 bits are included, the presence or absence of an error may be checked with reference to FIG. .
  • the CINR feedback type is the physical CINR information, whether there is an error in the physical CINR information or whether it is a feedback cycle of the physical CINR (S140), and as a result of the check of S140, the feedback cycle of the physical CINR In the case of the PCINR check procedure to determine whether the physical CINR information can be trusted (S145). Thereafter, the received CQI is applied (S230).
  • the feedback type of the received CQI is Effective CINR information
  • both the first and second bits of the 6 bits are not set to "0"
  • the received CQI does not include Effective CINR information.
  • the received CQI is applied to the system (S230). If at least one of the terminal and the base station does not support the AMC, an error is generated in the received CQI and the CQI is generated. Since it is not reliable, the corresponding CQI is discarded (S220).
  • the received CQI does not include CINR information as a result of the checking of S110, it is checked whether the feedback type of the CQI is an anchor BS (S150).
  • the base station does not support the Anchor BS as a result of the check in S300, an error occurs in the received CQI and thus the CQI cannot be trusted, and the corresponding CQI is discarded (S220).
  • the base station supports the anchor BS as a result of the check in S300, it is checked whether the current frame is the anchor BS feedback cycle (S310). As a result of checking in S310, when the current frame is an anchor BS feedback cycle, the received CQI is applied to the system (S230).
  • the UE and the base station supports the MIMO mode, as a result of S400, it is checked whether the feedback cycle of the currently received CQI is a feedback cycle including the MIMO mode information (S410).
  • the feedback cycle does not include MIMO mode information, an error occurs in the received CQI and thus the CQI cannot be trusted. Therefore, the corresponding CQI is discarded (S220), and the feedback cycle includes MIMO mode information. If is applied to the received CQI to the system (S230).
  • the check result of S500 if the received CQI satisfies the transmission and reception rule of the band AMC transition information, it is checked whether the current frame is a Band AMC feedback cycle (S510). As a result of checking in S510, if the current frame is not a Band AMC feedback cycle, the corresponding CQI is discarded (S220). If the current frame is a Band AMC feedback cycle, the received CQI is applied to the system (S230).
  • the CQI feedback type is not BWR as a result of checking of S180, as described above, it means that the received CQI does not include all information of CINR, Anchor BS, MIMO mode, Band AMC transition, and BWR. In this case, since an error occurs in the received CQI and the CQI cannot be trusted, the corresponding CQI is discarded (S220).
  • the base station supports Indication Flag feedback, if the check result of the S600, the CQI feedback type is ertPS, and performs the same S630 applied to satisfy the BWR rule.
  • a MAC layer may be configured to include reliable CQI and unreliable CQI among a plurality of CQIs continuously received by using characteristics of the CQI received from the UE. ), And by applying a reliable CQI can improve the overall data transmission efficiency of the system.
  • FIG 11 is a flowchart illustrating a method of checking channel quality information (CQI) according to a second embodiment of the present invention
  • FIGS. 12 to 14 are error checking methods of physical CINRs included in channel quality information (CQI) from a terminal. It is a figure which shows.
  • the CQI reported from the terminal to the base station includes physical CINR information, Effective CINR information, Anchor BS report, MIMO mode information, Extended rtPS bandwidth request, Indication Flag, and Band AMC transition information as described above.
  • the CQI is most often used for reporting Physical CINR among these various information.
  • the physical CINR information reported by the terminal should be reliable in order to obtain an optimal data transmission efficiency by applying an MCS suitable for the channel state at the base station.
  • the method for confirming channel quality information distinguishes reliable and unreliable Physical CINR information from Physical CINR information of CQIs continuously reported from a terminal to a base station and is reliable. By selectively applying physical CINR information to improve data transmission efficiency.
  • CQI is defined as including Physical CINR information.
  • the reception period (1 to 8 frames) of the CQI is checked (S720).
  • the CQI is periodically reported to the base station according to the frame period set in S720. For example, when the CQI is reported from the UE when the reception period is not preset, it may be regarded as an error in the received CQI.
  • ⁇ (1 to 1/16) according to Equations 1 and 2 is checked (S730).
  • ⁇ 1 to 1/16
  • the channel state is measured in 16 frames including the current frame.
  • Mean means to include the average physical CINR value according to the CQI. In other words, the smaller ⁇ is, the smaller the variation of the Physical CINR value included in the CQI.
  • the up-range range and down-range range of the preset CQI represents the physical CINR down-range range and the up-range range, it can be changed according to the moving speed, channel environment, ⁇ value of the terminal.
  • ⁇ is set to “1/16”, and the physical CINR is lowered by applying the experimental result of the environment where the CQI is reported to the base station every 8 frames.
  • the fluctuation range is -2dB and the physical CINR upward fluctuation range is + 6dB.
  • the discard count is initialized (S760), and an advanced CQI for which there is an error, for example, the first CQI is set as a received CQI (S770). Thereafter, the received CQI is applied to the system (S780).
  • the physical CINR value of the first CQI reported in the Nth period is 5dbB and the physical CINR value of the second CQI reported in the N + 1th period is 0dB, and the preset physical CINR is down. Comparing the physical CINR values of the first CQI and the second CQI by applying the fluctuation range (-2 dB), since the physical CINR value of the second CQI is -5 dB smaller than the physical CINR value of the first CQI, the downward fluctuation range of the CQI (- It can be seen that the 2dB) is exceeded. In this case, the CQI reported in the N + 1 period may be discarded according to the check result of S750 (S790).
  • the physical CINR values of the first CQI and the second CQI are applied by applying a preset physical CINR upward variation range (+6 dB). Compare At this time, the discarded second CQI is excluded from comparison. As a result, it can be seen that since the physical CINR value of the third CQI is +2 dB greater than the physical CINR value of the first CQI, the upward variation range (+6 dB) of the CQI is not exceeded.
  • the third CQI is received without errors and can be reliably. If an error does not occur in the received third CQI and is reliable, the discard count is initialized (S760), and the third CQI having been checked for an error is set as the received CQI (S770). Thereafter, the received CQI is applied to the system (S780).
  • the allowable value of the discard count is that an error is continuously generated in the received CQIs so that the quantity of discarded CQIs is set.
  • the allowable count of the discard count is set to 3 as an example. It was. When the tolerance value of the discard count is set to 3, an error occurs in three CQIs in succession, and when three discard CQIs are collected, it is checked whether physical CINR values between the discard CQIs exceed a predetermined CQI variation range.
  • the second CQI having a Physical CINR value of 20 dB and a Physical CINR value of 21 dB are described.
  • the first CQI having the 3rd CQI having a physical CINR value of 19 dB and the first CQI having the physical CINR value of 5 dbB all of them are discarded by exceeding a preset physical CINR upward variation range (+6 dB). .
  • the comparison with the first CQI having a physical CINR value of 5dbB exceeded a preset CQI up-range range or a down-range range, but a comparison was made in comparison between the physical CINR values of the discard CQIs. It can be seen that the CQI does not exceed the upward fluctuation range (+6 dB) or the downward fluctuation range (-2 dB). As described above, when there is a correlation between discarded CQIs, the discarded CQI can be trusted.
  • the N number of CQIs that are continuously discarded are the reference quantities.
  • Check whether the comparison is as much as the (discard threshold) (S860). Specifically, it is checked whether the most recent (Nth) CQI and the immediately preceding (N-1st) CQI of the N diskette CQIs are compared, and the N-1st CQI and the N-2nd CQI are compared. It is checked whether N discarded CQIs are compared by a threshold amount.
  • the discard count is initialized (S870), and the discard CQI is set as a reliable receiving CQI (S880). Thereafter, the discarded CQI is applied to the system (S780).
  • the reference quantity of the compared diskette CQIs means the number of recent diskette CQIs to be compared among the diskette CQIs stored in the storage unit. Among the card CQIs, the latest three discard CQIs are compared with each other.
  • the discard count is initialized (S760), and a message method (for example, REP_REQ / RSP message) capable of error detection and error correction is performed.
  • Physical CINR information of the CQI is received from the terminal (S850). Thereafter, when physical CINR information of the CQI is received through a message capable of error detection and correction, the received CQI is reliable and is applied to the system (S780).
  • the physical CINR values of the discard CQIs exceed a preset CQI upward fluctuation range (+6 dB), or the physical CINR values of the discard CQIs are preset. If the CQI downward fluctuation range (-2 dB) is exceeded, there is no correlation between the discard CQIs, and thus all recently received CQIs are unreliable.
  • the discard count is initialized (S760), and physical CINR information of the CQI is received from the terminal by using a message method (for example, a REP_REQ / RSP message) capable of error detection and error correction (S850). Thereafter, when physical CINR information of the CQI is received through a message capable of error detection and correction, the received CQI is reliable and is applied to the system (S780).
  • a message method for example, a REP_REQ / RSP message
  • S850 error detection and error correction
  • the IEEE 802.16 standard does not adopt a method of checking and correcting an error such as a cyclic redundancy check (CRC) when the UE transmits a CQI to the base station, the UE cannot verify whether the received CQI is reliable. If an error occurs in the CQI, it is difficult to provide a communication service to the terminal.
  • CRC cyclic redundancy check
  • a terminal uses a message method (for example, a REP_REQ / RSP message) capable of error detection and error correction when there is no correlation between discard CQIs.
  • a message method for example, a REP_REQ / RSP message
  • Physical CINR information of the CQI may be received from the CQI.
  • the method of confirming channel quality information according to the second embodiment of the present invention described above is an embodiment, and a method of checking and correcting an error such as a cyclic redundancy check (CRC) for a CQI originally reported from a terminal ( REP_REQ / RSP) may be used to transmit and receive CQI between the terminal and the base station.
  • a method of checking and correcting an error such as a cyclic redundancy check (CRC) for a CQI originally reported from a terminal ( REP_REQ / RSP) may be used to transmit and receive CQI between the terminal and the base station.
  • Receiving a CQI from the terminal using a method of checking and correcting an error may prevent an error of the CQI initially reported to the base station.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé permettant de vérifier les informations relatives à la qualité de la voie (CQI) d'un système Internet portable, et une station de base permettant l'exploitation de ce procédé. Un mode de réalisation décrit dans l'invention concerne un procédé permettant de vérifier les informations de qualité de voie lesquelles informations sont transmises par un terminal. Le procédé comprend les étapes qui consistent à vérifier le type d'informations contenu dans les informations de qualité de voie reçues à un cycle de trame prédéterminé depuis le terminal, puis à vérifier si une station de base et le terminal acceptent les services du types d'informations; à vérifier si les informations de qualité de voie reçues sont conformes aux normes relatives aux compte-rendus d'informations de qualité de voie en fonction des caractéristiques du type d'informations, si la station de base et le terminal acceptent des services correspondant au type d'informations; puis à appliquer les informations de qualité de voie au système si les normes relatives aux compte-rendus d'informations de qualité de voie sont respectées, et à écarter les informations de qualité de voie reçues si lesdites normes ne sont pas respectées.
PCT/KR2009/004738 2008-08-25 2009-08-25 Procédé permettant de vérifier les informations de qualité de la voie et station de base permettant l'exploitation de ce procédé WO2010024578A2 (fr)

Applications Claiming Priority (2)

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KR10-2008-0082751 2008-08-25
KR1020080082751A KR20100024072A (ko) 2008-08-25 2008-08-25 채널품질 정보 확인 방법과 이를 지원하는 기지국

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WO2010024578A3 WO2010024578A3 (fr) 2010-06-17
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WO2010024578A3 (fr) 2010-06-17
KR20100024072A (ko) 2010-03-05

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