WO2008023930A2 - Procédé d'émission/réception d'information en retour, et procédé d'émission/réception de données utilisant ce premier procédé - Google Patents

Procédé d'émission/réception d'information en retour, et procédé d'émission/réception de données utilisant ce premier procédé Download PDF

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Publication number
WO2008023930A2
WO2008023930A2 PCT/KR2007/004014 KR2007004014W WO2008023930A2 WO 2008023930 A2 WO2008023930 A2 WO 2008023930A2 KR 2007004014 W KR2007004014 W KR 2007004014W WO 2008023930 A2 WO2008023930 A2 WO 2008023930A2
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WIPO (PCT)
Prior art keywords
feedback information
cqi
information
data
value
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PCT/KR2007/004014
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English (en)
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WO2008023930A3 (fr
Inventor
Hyun Hwa Park
Seung Hee Han
Min Seok Noh
Dong Cheol Kim
Hyun Woo Lee
Yeong Hyeon Kwon
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Lg Electronics Inc.
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Publication date
Priority claimed from KR1020060079341A external-priority patent/KR101253169B1/ko
Priority claimed from KR1020060080360A external-priority patent/KR101319869B1/ko
Priority claimed from KR1020060085189A external-priority patent/KR101221904B1/ko
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2008023930A2 publication Critical patent/WO2008023930A2/fr
Publication of WO2008023930A3 publication Critical patent/WO2008023930A3/fr

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Classifications

    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the present invention relates to a method for transmitting/receiving feedback information and a method for transmitting/receiving data using the same, and more particularly to a method for transmitting/receiving feedback information such that it acquires accurate channel information and reduces an amount of overhead, and a method for transmitting/receiving data to effectively allocate resources during the initial transmission time.
  • a transmission end for transmitting data in a mobile communication system must receive two kinds of channel information from a reception end.
  • First channel information from among the two kinds of channel information is indicative of CSI (Channel State Information) .
  • the CSI indicates correct information for a mobile communication channel generated during a specific time from data transmission to the reception end, and is directly received from the reception end.
  • Second channel information is CQI (Channel Quality Information) which is indicative of the simplified CSI information.
  • the transmission end desires to extract transmission (Tx) data and control information from the received signals after receiving transmission (Tx) signals from the reception end, the transmission end requires the CSI, such that distortion caused by propagation signals received via a radio frequency (RF) channel can be removed by using the CSI.
  • RF radio frequency
  • the above-mentioned distortion-removing action has been called a channel equalization function.
  • the CQI indicates how strong the channel carrying the received signal is. In other words, the CQI indicates the channel intensity of the signal received in the reception end.
  • the CQI has been widely used by a resource scheduler.
  • the resource scheduler determines which one of channels can most effectively transmit data from the transmission end to the reception end.
  • the CQI indicates average characteristics of the channel.
  • the CQI averages the CSI according to a predetermined bandwidth, such that it indicates the average value of the CSI.
  • a channel response is denoted by "H”
  • the CQI at a specific band "k” can be represented by the following equation 1: [Equation 1]
  • G is indicative of the number of subcarriers summed up in the selected band "k".
  • the CQI is based on an average value of a channel power. If the CQI is really applied to the transmission end, this CQI is properly mapped and refined to a set of range definition according to modulation and channel-coding scheme, so that the resultant CQI is transmitted to a destination.
  • This modulated CQI value is called an MCS (Modulation and Coding Scheme) level.
  • the CQI indicates which one of MCS levels for use in a specific band "k" can effectively deliver a data signal from the transmission end to the reception end without generating significant problems.
  • the modulation-coding scheme is selectively and/or repeatedly changed according to the CQI value, and a variety of parameters (e.g., proper Tx power) can also be regulated by the CQI of the reception end.
  • a variety of parameters e.g., proper Tx power
  • the above-mentioned parameters capable of being regulated by the CQI value has been described in the 3GPP TS 25.214 V ⁇ .7.1 (published on December 2005) .
  • the CSI is firstly estimated, and the CQI is then measured.
  • Equation 1 based on the CSI is not used, and a plurality of reception powers of a specific carrier is summed up, such that the CQI can be estimated. Therefore, the above-mentioned equation 1 can be represented by the following equation 2:
  • R() is indicative of a reception (Rx) signal of the i-th subcarrier
  • P is indicative of an interval among pilots selected for the CQI estimation
  • G' is indicative of the number of Rx signals selected in the frequency band interval of the G value.
  • FIG. 1 exemplarily shows the CQI mapped by the modulation/coding scheme level.
  • FIG. 1 exemplarily shows a method for mapping the calculated CQI to a MCS level.
  • the mapping method is designed to change the MCS level whenever the calculated CQI is higher than a predetermined threshold value.
  • This threshold value changes the modulation and channel encoding actions to others, and a BER (bit error rate) , a PER (packet error rate) , and a processing performance are crossed at a specific location corresponding to the threshold value, such that the specific location is generally set to the threshold value.
  • the threshold value changes the MCS level according to the CQI value, and changes a variety of parameters such as Tx power of the transmission end.
  • a method for performing the modulation and channel encoding actions according to the MCS 0 ⁇ MCS N-I levels shown in FIG. 1 can be changed according to the system requirements.
  • a coding rate may be set to 1/2, and a modulation scheme may be set to the 16QAM method.
  • a coding rate may be set to 1/3, and a modulation scheme may be set to the QPSK method.
  • the 3GPP LTE may use a method of the Tables 7A ⁇ 7E prescribed in the 3GPP TS 25.214 V.6.7.1 (2005.12) or 3GPP TS 36 series (211, 212, 213, etc) , however, it should be noted that the scope of the above-mentioned parameter mapping relationship is not limited to the above- mentioned example, and can also be applied to other examples as necessary.
  • FIG. 2 is a conceptual diagram illustrating a general CQI feedback scheme.
  • the Node-B transmits a common pilot signal to individual users to measure the downlink (DL) channel quality at step (1) .
  • Each user measures the channel quality on the basis of the common pilot signal by exploiting orthogonal pilot sequence property, calculates the SINR per measuring bandwidth at step (2), and reports a CQI level index or multiple indices with frequency positions corresponding to the calculated SINR to the Node- B at step (3) .
  • the Node-B properly allocates resources according to channel states of the individual users by referring to the CQI value at step (4). Therefore, the Node-B determines the modulation scheme or the coding rate, and transmits data to a user equipment (UE) acting as a destination at step (5) .
  • UE user equipment
  • FIGS. 3 and 4 show a conventional method for transmitting the conventional CQI value to the transmission end.
  • the periodic CQI reporting scheme of FIG. 3 has been used to report the CQI to the UE, such that it has been widely used by a plurality of communication standards.
  • the periodic CQI reporting scheme commands the UE to periodically report the CQI value to the Node-B.
  • the method of FIG. 3 uses four sub-frames as a reporting period, it should be noted that the reporting period of the UE is determined by the Node-B and may also be changed according to status information of the UE.
  • the configuration of CQI reporting period can be informed through UL grant or high layer signaling.
  • the CQI reporting of each UE is periodically executed, irrespective of the presence or absence of DL (downlink) traffic data of each UE. If there are no CQI report messages on the condition that a specific UE includes the DL traffic information as denoted by oval- shaped circles in FIG. 3, and if there is no DL traffic information under the same condition, the individual UEs must report the CQI.
  • FIG. 4 shows a triggered CQI reporting scheme. Differently from the periodic CQI reporting scheme executed irrespective of data transmission, the above- mentioned triggered CQI reporting scheme has been designed to receive the CQI only when data transmission is required, such that it prevents uplink channel resources from being unnecessarily wasted.
  • the triggered CQI reporting scheme reports the CQI to the specific UE at intervals of a predetermined period of time. If data transmission is completed, the CQI transmission is no longer performed. Therefore, the CQI reporting is performed only when DL data is allocated to the specific UE as shown in FIG. 4. Also, during the above-mentioned CQI transmission, a variety of CQI formats can be made available and applied to the following three schemes, a detailed description thereof will hereinafter be described in detail. The three schemes are a Full Band CQI reporting scheme, a Best M CQI reporting scheme, and a Hybrid CQI reporting scheme.
  • the Full Band CQI reporting scheme transmits CQI information of all the scheduling bands to the Node-B when the UE transmits the CQI information to the Node-B. Since the Full Band CQI reporting scheme transmits CQI information of all the bands of a channel to the Node-B, the Node-B can recognize detailed information associated with the channel bands of the UE. Therefore, the Node-B can effectively use the UE' s channel bands. However, provided that the Full Band CQI reporting scheme transmits the CQI information to all the channel bands, much more uplink resources are consumed, so that an overall throughput might be deteriorated.
  • the Best M CQI reporting scheme transmits the CQI of a specific band profitable to each UE, instead of CQI information of all the bands, such that it prevents location information not to be used for the scheduling from being unnecessarily transmitted.
  • the UE calculates the CQI values of all the bands (Bl ⁇ B12) as shown in FIG. 5, and selects the best M CQI values from among the calculated CQI values.
  • FIG. 5 shows an example in which the M value is set to ⁇ M".
  • four CQI values (B2, B4, B7 and B9) having the highest CQI levels are selected from among all the CQI values (Bl ⁇ B12) .
  • the band including the selected CQI values is transmitted to an uplink channel along with the CQI values.
  • the Best M average CQI reporting scheme is generally similar to the Best M CQI reporting scheme. However, differently from the Best M CQI reporting scheme, the Best M average CQI reporting scheme transmits location information of the selected M bands (B2, B4 , B7 , and B9) , but it averages the selected M bands and transmits the average value of the selected M bands. As a result, the Best M average CQI scheme can slightly reduce the overhead caused by the CQI transmission. However, the Best B average CQI reporting scheme may incorrectly calculate
  • the hybrid CQI reporting scheme shown in FIG. 6 generates/transmits the CQI to recognize the profile of all the bands. All the bands are hierarchically grouped so that the hierarchically-grouped bands generate the level. The CQI values of individual levels are averaged in the grouping units for each level, so that the average CQI is calculated.
  • FIG. 6 shows a specific case in which the n value indicating the hierarchically-grouped level is set to any
  • the CQI value of the band B4 and an index value including the B4 CQI value are transmitted to the Node-B.
  • the CQI value of the band B14 and an index value including the B14 CQI value are transmitted to the Node-B.
  • the CQI value of the band B19 and an index value including the B19 CQI value are transmitted to the Node-B.
  • the above-mentioned CQI concept has been applied to a mobile communication system in various ways.
  • Representative examples of the CQI application are a CDMA communication technology for mobile phones and a mobile WiMax technology based on the IEEE 802.16.
  • the CDMA communication technology for mobile phones does not classify a transmission band, and transmits data to a destination using a sequence of the whole band, so that only one value for the whole band is transmitted to the destination.
  • a first transmission method e.g., old-version method before CDMA2000
  • a second transmission method e.g., CDMA2000 or HSDPA
  • the CDMA2000 technology uses a differential CQI to chase (or track) the changing CQI.
  • the CDMA2000 technology indicates a difference between a previously-transmitted CQI value and a current CQI value by 1-bit indicating the increment or decrement.
  • the OFDM transmission system such as the WiMax system capable of splitting a wireless transmission band transmits the CQI as to a channel scheduling subband discriminated by the scheduler to the transmission end.
  • the method for transmitting the CQI to the transmission end is the periodic CQI reporting scheme, and is relevant to the Best M average CQI reporting scheme.
  • This transmission method of the CQI is the band-based CQI reporting scheme, so that a large amount of overhead unavoidably occurs.
  • the differential CQI is used to reduce the large amount of overhead.
  • a few bits (including lbit) information having a predetermined option of +delta dB increment or -delta dB decrement (or MCS level differential) for each sub-band is transmitted to the transmission end.
  • the differential CQI is used to reduce the amount of CQI' s overhead.
  • the once-determined CQI might be continuously fixed in next times, and only the CQI variation within the predetermined band might be reported.
  • the CQI variation within the reported band has been designed to indicate only the increment/decrement on the basis of a specific value. So, if the increment or decrement does not occur, i.e., if a current status is maintained, either the increment information or the decrement information is transmitted to a destination, so that the transmission end may unexpectedly have the loss rather than the gain.
  • a differential value between a current signal and a previous signal indicates only the fixed-range value. Therefore, if a variation range of the CQI value is very large, the conventional system has difficulty in effectively coping with the CQI value.
  • the conventional system periodically transmits the CQI of the whole band to a destination, so that it indicates whether the differential CQI value is correctly represented. Unless the variation of the CQI value is represented by a current encoding scheme, the conventional system has no method for quickly informing the transmission end of this situation.
  • the conventional periodic CQI reporting scheme may periodically report the CQI value when a corresponding user is not allocated, or may not report the CQI value even when the data of the corresponding user is allocated, resulting in the occurrence of serious problems.
  • the triggered CQI reporting scheme transmits the CQI value only when data of the corresponding user is allocated. However, if several users simultaneously report the CQI value, several CQI channels are used, so that CQI channel capacity can be problematic.
  • the current CQI reporting schemes have no CQI information received from the UE during the transmission of initial data of the system. Also, the current CQI reporting schemes have no CQI information received from the UE, even when the user does not transmit data for a long period of time and then begins to transmit the data.
  • the above-mentioned first case is called an "initial data transmission case”
  • the above-mentioned second case is called “no available feedback information case” (i.e., no CQI information case) .
  • the system must transmit data of a base station (e.g., Node-B of 3GPP) to a destination without using the CQI information received from the UE.
  • a base station e.g., Node-B of 3GPP
  • the system since the system has no CQI information of a specific band, it is unable to select an effective transmission band from among several bands so that data of the effective transmission band cannot be transmitted to the destination.
  • the present invention is directed to a method for transmitting/receiving feedback information, and a method for transmitting/receiving data using the same, that substantially obviate one or more problems due to limitations and disadvantages of the related art.
  • An object of the present invention is to provide a method for transmitting a CQI value and information of a c band location at which data can be effectively transmitted, so that it reduces the number of errors generated during the tracking time of a variation of the CQI value.
  • Another object of the present invention is to provide a method for diversifying values indicated by differential information, so that it can more precisely indicate the variation of differential information.
  • Yet another object of the present invention is to provide a method for prescribing a specific function required for transmitting feedback information such as CQI.
  • Yet another object of the present invention is to provide a method for reducing an amount of CQI overhead, and effectively using allocated resources, thereby reporting feedback information such as CQI values of several users.
  • Yet another object of the present invention is to provide a method for reducing the number of bits of feedback information such as CQI, such that it can quickly consider an abruptly-changing channel status within limited resources .
  • Yet another object of the present invention is to provide a method and apparatus for effectively using resources during the transmission of initial data, so that it reduces the loss of data during the transmission time.
  • Yet another object of the present invention is to provide a method and apparatus for prescribing default feedback information during the transmission of initial data, recognizing channel information via differential feedback information transmitted or received, so that it can effectively exchange information.
  • a method for allowing a first reception end to transmit feedback information comprising: receiving a transmission request message of the feedback information from a transmission end; generating the feedback information including both band position information indicating a position of a data where data is received and a channel quality indication value indicating a channel quality of the band; and transmitting the feedback information.
  • the feedback information transmission request message is transmitted to the first reception end determined in consideration of individual priority information of the total reception ends.
  • a method for requesting transmission of feedback information comprising: if there are a plurality of reception ends which are going to transmit the feedback information at a specific timeslot, determining priority information of the individual reception ends; selecting a specific reception end which is going to transmit the feedback information in consideration of the determined priority information of the individual reception ends; and requesting transmission of the feedback information from the selected reception end.
  • a method for transmitting data of a Node- B comprising: transmitting a request message of feedback information to a User Equipment (UE) ; receiving the feedback information from the UE according to the feedback information request message; and after receiving the feedback information, starting transmission of downlink data.
  • UE User Equipment
  • a method for transmitting data of a Node- B comprising: if available feedback information is not received from a User Equipment (UE) , allocating downlink resources according to a distributed resource allocation scheme; and starting transmission of initial downlink data to the UE via the allocated downlink resources.
  • UE User Equipment
  • a method for transmitting data of a Node- B comprising: receiving default feedback information established by a User Equipment (UE) ; and transmitting initial downlink data via downlink resources allocated on the basis of the default feedback information.
  • UE User Equipment
  • a method for transmitting data of a Node- B comprising: establishing default feedback information to be equally used by both a User Equipment (UE) and the Node- B; transmitting initial downlink data via downlink resources allocated on the basis of the default feedback information; and receiving differential feedback information from the UE after transmitting the initial downlink data.
  • UE User Equipment
  • a method for receiving data of a User Equipment comprising: receiving a feedback information request message from a Node-B; transmitting a differential value between feedback information generated by the feedback information request message and default feedback information commonly contained in the Node-B and the UE; and receiving data via resources allocated from the Node-B on the basis of the differential value.
  • UE User Equipment
  • a method for receiving data of a User Equipment comprising: receiving initial downlink data via downlink resources allocated by a distributed resource allocation scheme; transmitting a differential value between feedback information replying to the reception of the initial downlink data and default feedback information commonly contained in both the UE and a Node-B to the Node-B; and receiving downlink data generated after the initial downlink data from the Node-B via downlink resources allocated on the basis of the differential value.
  • UE User Equipment
  • a method for receiving data of a User Equipment comprising: establishing default feedback information, and transmitting the established default feedback information to a Node-B; and receiving initial downlink data transmitted via downlink resources allocated on the basis of the default feedback information.
  • UE User Equipment
  • the present invention transmits the CQI value and the position information of a received band (i.e., Rx band) as feedback information, and reduces the number of errors caused when the Node-B tracks a CQI variation in an OFDM system capable of transmitting data via divided Tx bands, thereby correctly performing the scheduling of data.
  • a received band i.e., Rx band
  • the present invention allows the differential information to indicate the increment, decrement, and the same status between the current signal and the previous signal, so that it can more accurately track the CQI information.
  • the present invention can easily change the range of a differential value according to the variation speed of the differential information, and the mobility is gradually emphasized. As a result, the present invention can be effectively applied to the rapidly-changing channel.
  • the present invention can reduce an amount of overhead when the differential value is transmitted according to the joint encoding scheme, and properly selects a sequence indicating a necessary function according to the encoding scheme during the transmission of feedback information such as CQI, so that it quickly informs the transmission end of the specific situation as compared to the conventional art.
  • the Node-B decomposes the resources allocated for transmission of the feedback information according to priority information of individual UEs, so that the allocated resources can be effectively used.
  • the feedback information to be transmitted is CQI information
  • the present invention calculates the user priority in consideration of CQI characteristics, so that information necessary for the DL scheduling can be effectively transmitted via the limited resources.
  • the present invention transmits a differential value of feedback information via each channel, so that the number of bits of the feedback information to be transmitted can be reduced, and the number of channels allocated for transmission of the feedback information can also be reduced.
  • the present invention uses the feedback information with the reduced bits, so that the Node-B can quickly consider the abruptly-changing channel status .
  • the present invention transmits the CQI reporting request message to a corresponding UE during the initial data transmission, starts transmission/reception of the DL data after receiving the CQI value corresponding to the CQI reporting request message, so that it can stably transmit/receive data.
  • the present invention uses the distributed resource allocation scheme capable of minimizing the influence of a specific frequency band during the initial data transmission, so that it can stably transmit/receive data without generating an additional time delay.
  • the present invention exchanges information via the differential CQI value using the default CQI value commonly contained in the Node-B and the corresponding UE, so that UL resources can be effectively allocated.
  • the present invention performs the initial DL data transmission of the Node-B using the default CQI value created by signals received via the synchronization estimation process, before the corresponding UE receives the initial DL data, so that the initial data transmission can be effectively performed. Therefore, the present invention can use the default CQI value as a reference for calculating the differential CQI value.
  • FIG. 1 exemplarily shows CQI mapped by the modulation/coding scheme level
  • FIG. 2 is a conceptual diagram illustrating a general CQI feedback scheme
  • FIGS. 3 ⁇ 4 show a conventional method for transmitting a conventional CQI value to a transmission end;
  • FIG. 5 shows the Best M CQI reporting scheme;
  • FIG. 6 shows the Hybrid CQI reporting scheme;
  • FIGS. 7 ⁇ 8 show position information of data Rx bands of individual UEs;
  • FIG. 9 is an exemplary data structure for transmitting position information of a CQI reporting band according to the present invention.
  • FIG. 10 is an exemplary data structure for transmitting information indicating a CQI value according to the present invention.
  • FIG. 11 is a conceptual diagram illustrating a method for indicating a position variation of a band via which the UE receives data according to the present invention
  • FIG. 12 is a graph illustrating a slow variation of the CQI value according to the present invention
  • FIG. 13 is a graph illustrating a rapid variation of the CQI value according to the present invention
  • FIGS. 14 ⁇ -19 show exemplary channel structures for transmitting band position information and CQI values according to the present invention
  • FIG. 20 is a block diagram illustrating an apparatus for transmitting feedback information according to the present invention
  • FIG. 21 is a block diagram illustrating a method for selecting UEs going to report CQI values according to a preferred embodiment of the present invention
  • FIG. 22 shows a method for sequentially selecting UEs reporting the CQI using the method of FIG. 21 according to the present invention
  • FIGS. 23 ⁇ 26 show detailed concepts of the sequential selection method shown in FIG. 22 according to the present invention.
  • FIG. 27 is a conceptual diagram illustrating a method for reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention
  • FIGS. 28 ⁇ 30 are conceptual diagrams illustrating methods for reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention
  • FIG. 31 is a conceptual diagram illustrating a method for sequentially selecting UEs reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention
  • FIGS. 32 ⁇ 33 show detailed concepts of the sequential selection method shown in FIG. 31 according to the present invention.
  • FIG. 34 is a block diagram illustrating characteristics of a Node-B according to another preferred embodiment of the present invention
  • FIG. 35 is a conceptual diagram illustrating a method for delaying data transmission until the CQI is received from the UE, and transmitting the delayed result according to a preferred embodiment of the present invention
  • FIG. 36 shows the preferred embodiment of FIG. 35 from the viewpoint of a data stream to be transmitted according to individual steps according to the present invention
  • FIG. 37 is a conceptual diagram illustrating a distributed resource allocation scheme and a localized resource allocation scheme according to the present invention.
  • FIG. 38 is a conceptual diagram illustrating a method for transmitting initial data according to the distributed resource allocation scheme according to a preferred embodiment of the present invention
  • FIG. 39 is a conceptual diagram illustrating a method for establishing a default CQI value during the transmission of initial data, and transmitting the established default CQI value according to a preferred embodiment of the present invention
  • FIG. 40 is a conceptual diagram illustrating a method for transmitting the CQI of each user using the default-CQI establishing method of FIG. 39 according to the present invention
  • FIG. 41 is a block diagram illustrating an apparatus for delaying data transmission until the CQI is received during the initial data transmission, and transmitting the delayed result, and the Node-B including the apparatus according to a preferred embodiment of the present invention
  • FIG. 42 is a block diagram illustrating an apparatus for transmitting data according to the distributed resource allocation scheme, and the Node-B including the apparatus according to another preferred embodiment of the present invention.
  • FIG. 43 is a block diagram illustrating an apparatus for transmitting data using the default-CQI value during the transmission of initial data, and the Node-B including the apparatus according to still another preferred embodiment of the present invention.
  • FIGS. 7 ⁇ 8 show position information of data Rx bands of individual UEs.
  • FIGS. 7 ⁇ 8 differently from the CDMA communication scheme capable of transmitting data via all bands without dividing the transmission (Tx) band into sub-bands, the communication scheme is shown, which divides a radio frequency (RF) band into sub-bands so that it transmits data via the the sub-bands, and may change a Tx channel of data applied to each UE according to the lapse of time.
  • a specific system e.g., a cognitive radio communication system
  • the above-mentioned characteristics become more serious.
  • downlink (DL) data transmitted to each UE is transmitted over a channel having different bands for each sub-frame, and the number of allocation channels for transmitting the DL data is changeable.
  • the number of allocation channels for DL data applied to each UE is fixed to a predetermined number, data applied to each UE is changeable according to sub-frames. Therefore, if the system transmits a feedback signal on the assumption that the once-selected band is unchangeable during the reporting time of either the CQI value or the differential CQI value, the system may transmit incorrect information according to a communication scheme (e.g., WiMax) , dividing the RF band into several sub-bands.
  • WiMax e.g., WiMax
  • the system may transmit incorrect information according to a specific communication scheme (See FIG. 7 or 8) capable of changing a transmission band of DL data with time . Therefore, the frame structure for transmitting feedback information (e.g., CQI) according to the present invention can transmit only the CQI value, and can include band position information indicating the position of a data reception band in the CQI value, such that it transmits the resultant CQI value indicating a channel quality of the above-mentioned band to a destination.
  • all or either of the above-mentioned band position information and the channel quality information may be configured in the form of a differential signal, so that an amount of a corresponding signal may be decreased.
  • a method for reporting feedback information of the data reception channel may basically include two steps for indicating the differential CQI values, i.e., a first step for reporting the band position, and a second step for reporting a variation of the band CQI value.
  • the band position information and the CQI value may be simultaneously transmitted, or may be transmitted independent of each other.
  • the above-mentioned method for reporting the feedback information of the data reception channel may further include not only different analysis results of the values indicated by bits of the differential CQI value, but also an adaptation step thereof.
  • the system In order to indicate the differential value using bits, the system must consider the number of cases and the available ranges of individual values. The resultant number of cases may indicate the number of necessary bits. There are a variety of methods for indicating the above- mentioned values, i.e., a separate encoding scheme, and a joint encoding scheme.
  • the separate encoding scheme allocates individual differential values to independent bit sequences.
  • differential values are encoded by differential positions and/or bits to which the differential CQI values are assigned, and the encoded values are concatenated in the form of a single signal. If reporting channel capacity cannot afford the concatenated bit sequences, the combination of differential position and CQI can be transmitted separately in a time division-wise.
  • One of aspect for above mentioned separate transmission is to divide the selected band information into separate transmission unit.
  • Another aspect of above mentioned separate transmission is to divide the concatenated sequence to fit into the reporting channel capacity and the segmented sequences is transmitted in time division-wise. In this case, in order to extract information of each band, the separate encoding scheme must recognize only positions of corresponding bits, so that the separate encoding scheme can be easily implemented.
  • N* the number of cases to be indicated by K-th information
  • the joint encoding scheme binds values of several bands associated with the combination of individual differential values into a single group, such that it considers the number of cases under the above-mentioned situation.
  • the combination of all differential values is assigned to a single bit sequence.
  • the system In order to recognize either the position information corresponding to individual bands or the CQI variation of the individual bands, the system must check all the bit sequences according to the joint encoding scheme. In this way, if several values are grouped into a single structure, the system may indicate the values with the least number of bits, so that the total amount of overhead can be reduced. If the number of cases to be indicated by the K-th value is is JV* and the number of JV* values is M, the total number of cases to be indicated can be represented by the following equation 3:
  • N 1 • N 2 • ... • N M TTN k
  • the total number of used bits can be represented by the following equation 4 :
  • FIG. 9 is an exemplary data structure for transmitting the CQI reporting band position information according to the present invention.
  • the left side of FIG. 9 shows a specific case in which differential position information is indicated by independent bits
  • the right side of FIG. 9 shows another case in which the differential position information is grouped into a single structure, so that the grouped structure is shown in the right side of FIG. 9.
  • the position information values DP1—DP5 are not considered to be equal to each other and then combined, but different weights are assigned to the position information values DP1 ⁇ DP5 so that the position information values DP1 ⁇ DP5 having different weights are combined with each other.
  • ⁇ is assigned to DPI
  • ⁇ l is assigned to DP2
  • ⁇ 3 is assigned to DP3
  • coA is assigned to DP4
  • ⁇ 5 is assigned to DP5
  • the order of the weights ⁇ ⁇ ⁇ 5 can be represented by ⁇ l ⁇ ⁇ l ⁇ ⁇ 3 ⁇ ⁇ 4 ⁇ ⁇ 5.
  • the highest weight is assigned to specific information indicating position information of a band at which the most recent data is received, so that the resultant data may be transmitted to a desired destination.
  • FIG. 10 is an exemplary data structure for transmitting information indicating a CQI value according to the present invention.
  • the left side of FIG. 10 shows a specific case in which differential CQI values are indicated by independent bits
  • the right side of FIG. 10 shows another case in which the differential CQI values are grouped into a single structure so that the grouped structure is shown in the right side of FIG. 10.
  • the system of FIG. 10 assigns weights to individual bit information and combines the resultant bit information with each other. In this way, if the system desires to transmit only specific information indicating only the differential CQI values, the right side or the left side of FIG. 10 may be selectively used to transmit the specific information.
  • FIG. 11 is a conceptual diagram illustrating a method for indicating a position variation of a band via which the UE receives data according to the present invention.
  • a band position of a transmission (Tx) channel of current data and a current CQI value of data transmitted via the band may be higher than a previous band position and CQI, may be lower than the same, or may be equal to the same as necessary.
  • the conventional system is designed to indicate the increment or decrement of a current signal in association with a previous signal, so that it is unable to indicate a specific case in which the current signal is equal to the previous signal.
  • Rx band position information position information of a reception (Rx) band
  • Rx band position information may encounter a serious problem because the error of +1 and the error of -1 in index information of a corresponding band may indicate different bands.
  • the position of the data Rx band is maintained during a predetermined frame as shown in FIG. 11. Therefore, if the data Rx band position is indicated by an index indicating a previous Rx band position, the value of +1, and the value of -1, the accuracy of the scheduling task may be greatly deteriorated.
  • the present invention provides a method for indicating the CQI value and the data Rx band position signal using the increment value of +1 indicating that the current signal is higher than the previous signal, the decrement value of -1 indicating the current signal is lower than the previous signal, and the same status value of 0 indicating that the current signal is equal to the previous signal, so that it can transmit more accurate feedback information.
  • the band position may be maintained during a predetermined frame, and the method for reporting feedback information according to the present invention transmits the Rx band position information much more infrequently than the CQI reporting method, so that the overhead of uplink resources is reduced.
  • the transmission of the band position information may be limited to only a specific case in which the position of the Rx band is changed to another position.
  • the increment is indicated by the value of +1
  • the decrement is indicated by the value of -1
  • the same status is indicated by the value of 0.
  • the variation of the difference value between the current signal and the previous signal can be adjusted by the signal-variation width, and a detailed description thereof will hereinafter be described with reference to FIGS. 12 and 13.
  • FIG. 12 is a graph illustrating a slow variation of the CQI value according to the present invention.
  • FIG. 13 is a graph illustrating a rapid variation of the CQI value according to the present invention.
  • the present invention may change the range of a value indicated by each bit so as to track the rapid variation of the CQI value.
  • a horizontal axis of FIG. 12 or 13 indicates a time (i.e., a sub-frame), and a vertical axis of FIG. 12 or 13 indicates a CQI level at a sub-frame of a corresponding time.
  • the present invention is able to track a CQI value of a slowly-changing channel by the combination of three values -1, 0, and 1.
  • the present invention may perform scaling of the range of the CQI value, or may exponentially change the range of the CQI value.
  • mapping methods for use in the above-mentioned scheme i.e., a first mapping method, a second mapping method, and a third mapping method.
  • the first mapping method is indicative of a mapping model based on a single parameter (M) , so that it exemplarily indicates a differential value in the form of ..., -3*M, -2*M, -M, 0, M, 2*M, and 3*M, ....
  • M a single parameter
  • the second mapping method is designed to use two parameters M and P.
  • the second mapping method indicates the differential value in the form of ..., -M-2P, -M, -P, 0, M, M+P, and M+2P, ....
  • the differential value between the M and P values may be denoted by ..., -3, -2, -1, 0, 1, 2, and 3, ....
  • the M value is set to "1” and the P value is set to "2”
  • the differential value between the M and P values may be denoted by ..., -5, -3, -1, 0, 1, 3, and 5, ...
  • the above- mentioned second mapping method has an advantage in that it indicates a differential value (e.g., values between M and 2M values) within the range of the magnitude M.
  • the third mapping method may exponentially use four parameters X, M, P, and N.
  • the third mapping method may indicate the differential value in the form of ..., X+M*P (N*2) , X+M*P lN* ⁇ , X+M*P (0) , 0, -X-M*P (0) , -X- M*P (Nn> , and -X-M*P (N*2) , ....
  • the X value is set to 0, the M value is set to 1, the P value is set to 2, and the N value is set to 1, the differential value may be denoted by ..., 4, 2, 1, 0, -1, -2, and -4, ....
  • the third mapping method can adjust the interval between a first differential value at a part close to a central value and a second differential value at a part distant from the central value, such that the differential values can be combined in various ways.
  • the range of a value capable of being tracked by the differential value can also be adjusted.
  • the part for requesting the CQI may transmit the variation of the above-mentioned model to the other party using a specific bit sequence or command, and may report the differential CQI from the other party.
  • FIGS. 14 ⁇ 19 show exemplary channel structures for transmitting band position information and CQI values according to the present invention.
  • the recording data of the CQI variation value is converted into' a bit sequence by the separate encoding scheme and the joint encoding scheme.
  • an index value of a selected band and the CQI variation value within the selected band must be tracked.
  • the present invention may request a differential CQI value for the selected band as shown in FIG. 10.
  • the present invention may report whether the position of bands selected at the same transmission time or different transmission times is unchanged.
  • the reporting scheme may be executed as shown in FIG. 9.
  • the differential values can be transmitted as shown in FIGS. 9 and 10.
  • the differential values may be combined in various ways as shown in FIGS. 14 to 19.
  • FIG. 14 shows a specific case in which separately- encoded differential CQI values are attached to the differential index values of the selected band, and the attached result is transmitted to a desired destination.
  • FIG. 15 shows a modified example of FIG. 14.
  • FIG. 15 shows a specific case in which only differential position information is merged- encoded.
  • FIG. 17 shows a specific case in which the differential position information and the differential CQI value are merged-encoded, respectively, so that the merged- encoded result is transmitted to a destination.
  • FIG. 18 shows a specific case in which the differential position information and the differential CQI value are considered to be only one information, so that the merged-encoding process is applied to the resultant information.
  • FIG. 19 shows a specific case in which the differential band position information and the differential CQI value are merged-encoded in units of sequential bits, and the merged- encoded result is transmitted to a destination.
  • the reception end has an advantage in that it can track the sequential band position information and CQI values .
  • the differential CQI information and the differential position information are not equally combined with each other, but predetermined weights are assigned to individual bits of the above- mentioned information, so that the resultant data having different weights is transmitted.
  • the Node-B divides the received information into individual bit information, so that the Node-B can analyze the differential CQI value and differential position information on the basis of the divided bit information.
  • the differential CQI value and the differential position information received by the joint encoding scheme may also be used to perform the next scheduling.
  • the band position is unchanged during a specific sub-frame and only the CQI value of each sub-frame is changed during the specific sub-frame, the highest weight is assigned to the CQI value of the most recently received signal, so that the resultant CQI value including the hi'ghest weight is transmitted to a desired destination. Therefore, the CQI value of the data Rx band can reflect the most recent CQI value.
  • the reception end can extract a differential CQI value and differential band position information for each bit.
  • the present invention can properly track the variation of CQI values and the variation of a selected band. It is obvious to those skilled in the art that various modifications of the present invention can be implemented in various ways as shown in FIGS. 14 to 19.
  • the conventional system has been designed to periodically transmit an overall-band CQI to indicate whether a differential CQI value is correctly expressed. As a result, if the abrupt CQI variation cannot be represented by the current encoding scheme, the conventional system is unable to quickly inform the transmission end of this situation.
  • the present invention provides a method for defining a special function capable of informing the transmission end of the above-mentioned case.
  • the special function may be relevant to the method for indicating the CQI information using the separate encoding scheme or the joint encoding scheme. A method for defining the special function using each encoding scheme, and analyzing associated values will hereinafter be described in detail.
  • the unary- data mapping method (also called a unidirectional data mapping method) is designed to define only unidirectional variation of data in the number of several cases associated with bit sequences. In more detail, only the positive (+)- directional variation of data or the negative (-)- directional variation of data can be defined by the unary data mapping method. For example, if 1-bit has two numbers
  • the numbers of cases are mapped by the increasing/decreasing permutations as denoted by ⁇ 2,1 ⁇ or ⁇ -1,-2 ⁇ .
  • the two bits i.e., 2-bit
  • the resultant number denoted by ⁇ 00, 01, 10, 11 ⁇ is mapped by the increasing/decreasing permutations as denoted by ⁇ 1,2,3,4 ⁇ and ⁇ -1,-2,-3, -4 ⁇ .
  • a special function may be mapped to a specific bit sequence as necessary.
  • a specific sequence ⁇ 111 ⁇ from among several sequences denoted by 3 bits may be designed to describe a specific situation incapable of being explained by a currently-defined mapping scheme. If the Node-B receiving the differential value composed of 3 bits meets the sequence ⁇ 111 ⁇ , the Node-B recognizes that the current CQI cannot be estimated by a corresponding mapping scheme, so that it requests an overall CQI from the UE.
  • the UE transmits a sequence for a special function to the Node-B, so that the Node-B can recognize that the CQI variation cannot be represented by the unary data mapping scheme indicating only the unidirectional increment/decrement .
  • the Node-B receives the sequence from the UE, generates a command for switching the increasing/decreasing direction, and transmits the command to the UE as necessary.
  • the UE may recognize that the CQI variation cannot be represented in the increasing/decreasing directions, and may switch the increasing/decreasing directions to other directions.
  • the binary mapping method is similar to the unary mapping method, however, it should be noted that the increment/decrement actions of data are executed in all of positive/negative directions, differently from the unary mapping method.
  • the binary differential information may be indicated by the combination of positive and negative values, as shown in the combination ⁇ 1,-1 ⁇ .
  • the binary differential information may be indicated by the combination ⁇ -1,0,1,2 ⁇ or ⁇ -2,-1,0,1 ⁇ of positive and negative values.
  • the binary data mapping method may define the special function in the same manner as in the unary mapping method.
  • the sequence ⁇ 11 ⁇ is established by a special function, and the Node-B receives the sequence ⁇ 11 ⁇ , the binary mapping method determines that the CQI value cannot be tracked by the current mapping references, such that the UE requests the overall CQI.
  • the joint encoding scheme may have the combination more easily than the separate encoding scheme.
  • the joint encoding scheme can represent the bit sequence more effectively than the separate encoding scheme.
  • the separate encoding scheme requires 2 bits.
  • the separate encoding scheme requires 6 bits.
  • the number of total available cases is 27, and is denoted by 5 bits. Since only 27 sequences from among 32 sequences denoted by the 5-bit are defined, the joint encoding scheme can define the special function using the. remaining values.
  • each differential value may have three values ⁇ -1,0,1 ⁇ and the value denoted by ⁇ -1,0,1 ⁇ should be transmitted five times.
  • the 243 combinations can be represented by 8 bits.
  • the above-mentioned 243 sequences from among 256 sequences, each of which is represented by 8 bits, are expressed and the remaining 13 sequences are left.
  • One of the aforementioned sequences may indicate an overall failure of the differential mapping.
  • first CQI information from among the CQI information may indicate the error
  • second CQI information may also indicate the error as necessary.
  • the bit sequence value to be transmitted can be represented by the following equation 5:
  • Equation 5 Equation 5 can also be represented by the following equation 6:
  • ⁇ k is indicative of a weight of the d k value.
  • the reception end may decide CQI information on the basis of the L value, may search for each differential value d k , and may decide the CQI information on the basis of the retrieved differential value d k . If the CQI information is decided by the joint- encoding value (L) , it is preferable that the highest weight is assigned to differential value information relevant to the most recently-received data, so that the channel status can be properly decided.
  • a method for searching for the dj value corresponding to each differential value from among the joint-encoding value (L) can be performed as follows. Firstly, in the case where no weight is assigned to each differential value information and the differential values having no weights are combined with each other, this situation can be represented by the following equation 7:
  • Equation 8 [Equation 8 ] k - 1
  • the joint encoding scheme is used as described above, the number of Rx data bits can be reduced, and an amount of overhead of uplink resources can also be reduced.
  • the highest weight is assigned to the final differential value during the joint encoding operation, so that the possibility of damaging the final differential value during the transmission time is minimized.
  • the method for analyzing the feedback information acquires information indicating a data Rx band position from feedback information entered by the UE, and acquires CQI information at the data Rx band. And, if the band position information and the CQI value are represented by the differential values as described above, the differential values are compared with previous values, so that the perfect band position information and the perfect CQI information can be acquired.
  • FIG. 20 is a block diagram illustrating an apparatus for transmitting feedback information according to the present invention.
  • Tx data of the Node-B is received via an antenna, and is received in the controller 1001 via a duplexer.
  • the controller 1001 may extract information (p k ) indicating a Rx band position and a CQI value (r k ) of the corresponding band from the Rx data (R) .
  • the controller 1001 transmits a control signal (c) to the calculator 1003 and the encoder 1004, so that it controls operations of the calculator 1003 and the encoder 1004.
  • the information (r k and p k ) extracted by the controller 1001 may be applied to the buffer 1002 and the calculator 1003.
  • the buffer 1002 stores received information (r k and p k ) , so that it may output information (rk-i and p k -i) stored after 'the lapse of a single frame (i.e., 1-frame) to the calculator 1003.
  • the buffer 1002 may store a plurality of information pieces during the interval of the 1 frame, and a detailed description thereof will hereinafter be described in detail.
  • the calculator 1003 receives the information values (r k -i and p k -i) stored during a frame period corresponding to the 1-frame interval, and receives new information values (r k and p k ) from the controller 1001, such that it can calculate differential values (dv k and dp k ) of the received information values.
  • the calculator 1001 calculates a differential value of the band position information and a differential value of the CQI value.
  • the band position information having a relatively-low variation determines whether the data Rx band position is changed less times than in the CQI value information.
  • the controller 1001 determines whether the data Rx band position is changed or not, and informs the calculator 1003 of the variation of data Rx band position via the control signal (c) , the differential calculation process reduces the amount of Tx signal only when the data Rx band position variation is notified to the calculator 1003 via the control signal (c) , so that the amount of overhead can also be reduced.
  • the differential values (dv k and dp k ) generated by the calculator 1003 may enter the encoder 1004.
  • the encoder 1004 receives the differential band position information (dp k ) and the differential CQI value (dv k ) according to the control signal (c) of the controller 1001, encodes the received data (dp k and dv k ) in various ways as shown in FIGS. 14 to 19. If required, a specific sequence performs data mapping for a special function, and may generate Tx data (L) .
  • the Tx data (L) is transmitted to the Node-B via the antenna after passing through the duplexer .
  • the selected CQI reporting scheme for determining the CQI reporting on the basis of the UE priority information will hereinafter be described in detail.
  • the UE priority is determined on the basis of a channel variation status of UEs, a CQI transmission time interval, and a throughput in a wireless communication environment.
  • the selected CQI reporting scheme In order to effectively use the limited radio resources, the selected CQI reporting scheme considers a channels status, a CQI transmission time, and a data rate when determining the UE priority reporting the CQI, so that it transmits the CQI in descending numerical orders of the UE priority. As a result, the selected CQI reportint scheme reduces the CQI overhead, can effectively use the resources, and sufficiently considers a changing channel status via the limited CQI reporting channel using a differential CQI value, so that the system performance is improved.
  • FIG. 21 is a block diagram illustrating a method for selecting UEs going to report CQI values according to a preferred embodiment of the present invention. Referring to FIG.
  • the Node-B transmits a common pilot signal to individual UEs of users, and each UE measures a SINR of the received signal and determines a CQI index indicating a channel quality level of downlink (DL) data.
  • Each UE transmits this CQI value in an uplink direction to effectively report the CQI value, so that the resources can be maximally used.
  • the system of FIG. 21 transmits the CQI value only when user data to be transmitted to a DL traffic path exists, so that it can reduce the number of unnecessary reporting times. If there are several users who desire to transmit data at the same time, the Node-B selects a specific UE acting as the CQI transmission target according to the priority information determined by a variety of factors, so that it reduces the number of channels used for CQI transmission. And, the system firstly transmits the CQI of the high-priority user according to the channel status and condition of the users, so that it solves the CQI overhead problems and improves the performance.
  • the priority of UEs (i.e., the UE priority) can be determined by the following characteristics, as represented by the following equation 9:
  • V VOI is indicative of the degree of a difference between a CQI value of a previous sub-frame of the i-th UE and a CQI value of a current sub-frame of the i-th UE
  • ⁇ t c0l indicates how long the transmission time interval between a previous CQI value of the i-th UE and a current CQI value is
  • SINR 1 is indicative of the degree of the SINR value of the i-th UE.
  • det erro ⁇ is indicative of the degree of errors of Rx data of the i-th UE
  • (T 1 ⁇ T req ) indicates that the throughput of the i-th UE is lower than that of the system
  • R 1 is how tall the data rate of the i-th UE is.
  • the priority function P (xl, x2, ..., xn) shown in Equation 9 is configured in the form of an increasing function for each characteristic parameter (xi) .
  • a specific weight is multiplied by each characteristic parameter according to system requirements, as represented by the following equation 10:
  • ⁇ x — ⁇ b indicate the weights assigned to individual parameters.
  • the UE having the priority determined by Equation 9 or 10 is selected as a CQI reporting object by the Node-B.
  • the UEs are selected as the CQI reporting objects in descending priority orders.
  • the Node-B transmits a CQI transmission request message to high-priority UEs selected as the CQI reporting objects, and the CQI transmission request message is transmitted to the UEs along with Tx data of each UE.
  • V VQI is indicative of a difference between a CQI value of a previous frame and a CQI value of a current frame
  • ⁇ t c ⁇ is indicative of a time interval between the CQI value of the previous frame and the CQI value of the current frame.
  • the present invention can determine the priority of UEs by considering only the above-mentioned two values V lQI and
  • Priority M9K .P(w ⁇ V- v ⁇ . W 2 Ai 1 VJ )
  • FIG. 22 shows a method for sequentially selecting UEs reporting the CQI using the method of FIG. 21 according to the present invention.
  • FIGS. 23 ⁇ 26 show detailed concepts of the sequential selection method shown in FIG. 22 according to the present invention.
  • the present invention basically assumes that the CQI transmission request occurs only when data to be transmitted by the UE exists. And, it is assumed that each UE receives two uplink channels (e.g., HD-SICH) for CQI transmission from the Node-B.
  • the DL traffic data See upper part of FIGS. 22 and 23 ⁇ 26
  • the CQI traffic data See lower part of FIGS. 22 and 23 ⁇ 26
  • the Node-B transmits the CQI transmission request to UE3 and UE4, each of which has the DL traffic data in the two allocated UL channels at step CD.
  • UEl and UE2 are selected as the transmission targets by the ⁇ t CQ/ value.
  • the UEl is selected by the SINRi value. If unexpected errors occur in Rx data of the UE4, the UE4 can also be selected by the det_errori value. In the meantime, since the UE having data in the DL traffic information is only the UEl, only the UEl is selected as the CQI reporting object at step ⁇ .
  • the UE which is going to transmit the CQI at the above steps is selected by the Equations 9 and 11. Generally, the number of selected UEs is equal to the number of channels allocated for CQI transmission.
  • the Node-B transmits only the CQI of the UE having data to be received.
  • the Node-B may select the UE, which is going to transmit the CQI, from among several UEs in consideration of channel capacity for CQI transmission of each UE.
  • the Node-B selects all of UEs, each of which has priority higher than a predetermined priority value.
  • the Node-B may transmit the CQI transmission request to only some UEs instead of all the selected UEs.
  • the UE3 is selected by the det_errori value, and at the same time the UE4 is selected by the ⁇ ? c ⁇ / value.
  • the UE2 is selected by the ⁇ / c ⁇ /j
  • the weight multiplied by the V VOI value is higher than the weight multiplied by the det_error x value, so that the UE3 is selected.
  • the above-mentioned cases has been disclosed as examples of the present invention, and the weight multiplied by each parameter may also be changed.
  • the Node-B selects the UEl having the abruptly-changing channel and the UE2 having a long Tx-time interval at step (9). In this way, if the UE is selected as a CQI transmission target, the Node-B transmits the CQI transmission request message to the UEs, so that the CQI may be reported to individual UEs according to the allocated band and capacity.
  • the Node-B selects the UEl and UE4 receiving data at step @. If all the channels are not abruptly changed, the Node-B selects the UE2 and the UE4 as the CQI reporting objectts by the ⁇ t CQI ⁇ value at step ⁇ . According to the concepts of FIGS. 22 and 23 to 26, the Node-B transmits the CQI request message to only the UE having Rx data in the DL traffic information.
  • weights are sequentially assigned to the priority function of Equation 10 in the order of subscripts attached to the weights.
  • FIGS. FIGS. 22 and 23 to 26 it should be noted that other examples of the present invention can be readily implemented by those skilled in the art. If there are several UEs capable of transmitting the CQI using the method for transmitting the feedback information, a differential CQI value may be transmitted to the UEs, and a detailed description thereof will hereinafter be described in detail.
  • FIG. 27 is a conceptual diagram illustrating a method for reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention.
  • the system of FIG. 27 is based on the CQI reporting scheme for reporting the priority information of individual UEs, and employs a differential CQI value to effectively use radio resources, so that it reduces the number of bits of the CQI information.
  • CQI information of UEs which desire to transmit data can be effectively transmitted via a limited channel, resulting in an increased system performance.
  • the above-mentioned scheme is called a SDV (Selection Differential Value) CQI reporting scheme, and a detailed description thereof will hereinafter be described in detail.
  • the SDV CQI reporting scheme measures the SINR of a received signal (Rx signal) in the same manner as in the above-mentioned selection CQI reporting scheme, and measures the DL-channel status on the basis of the measured SINR of the Rx signal.
  • the priority is determined according to the measured CQI value and the UE condition. If there are several UEs which are going to transmit the CQI according to the priority, the Node-B transmits the CQI using the differential value indicating a difference between the previous CQI value and the current CQI value.
  • the SDV CQI reporting scheme can reduce the CQI overhead because the UE for selectively transmitting the CQI is determined according to the priority information, and at the same time it reports the differential CQI value so that it reduces the number of information bits. As a result, CQI of several UEs can be effectively transmitted to a destination without increasing an additional CQI transmission channel.
  • FIGS. 28 ⁇ 30 are conceptual diagrams illustrating methods for reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention.
  • the Node-B equally allocates the same resources to individual CQI reporting channels. Needless to say, the UEs receiving the CQI transmission channel are selected as the CQI transmission targets in consideration of their priority information. According to the concept of FIG. 28, resources are equally allocated to the selected UEs, so that the CQI values having the same accuracy are transmitted to the selected UEs.
  • some UEs having low priority have no opportunity for transmitting data according to the CQI variation, however, the remaining UEs having high priority divide resources into sub-units and transmit the data via the divided resources.
  • the concept of FIG. 29 excludes some UEs from the CQI transmission targets in consideration of channel transmission capacity according to a predetermined condition.
  • the predetermined condition indicates a difference between a CQI value of a previous transmission frame and a CQI value of a current frame on the basis of the priority information indicating whether the reception end has correctly recognized the previous CQI value.
  • the Node-B determines whether the priority of each UE is higher than a predetermined value, and selects all the UEs, each of which has the priority higher than the predetermined value, as the CQI reporting objects. Thereafter, at a second selection step, the Node-B re-selects the UE used as the CQI reporting objectt in consideration of channel capacity.
  • the priority considered at the first selection step may be equal to the priority considered at the second selection step, however, the objects considered at first and second steps are different from each other, so that different weight may be assigned to individual parameters.
  • UEs which are selected according to the priority information and share the CQI transmission channel, are allocated a different amount of resources.
  • the Node-B can more precisely transmit the CQI information of the high-priority UE. Exemplary methods of the above-mentioned SDV CQI reporting scheme will hereinafter be described in detail.
  • FIG. 31 is a conceptual diagram illustrating a method for sequentially selecting UEs reporting the CQI using a differential value when the number of selected UEs is a plural number according to the present invention.
  • FIGS. 32 ⁇ 33 show detailed concepts of the sequential selection method shown in FIG. 31 according to the present invention.
  • the Node-B reports the CQi only when DL data to be transmitted exists. If the CQI information of at least two UEs is transmitted at the same time, the concept of FIGS. 31 to 33 assumes that a differential value between the CQI value- of a previous sub- frame and the CQI value of a current sub-frame should be reported.
  • the DL traffic data (See upper part of each drawing) and the CQI traffic data (See lower part of each drawing) of the same UE are denoted by the same oblique lines, as shown in FIGS. 22 and 23 ⁇ 2 ⁇ .
  • CQI values of the UE2 and UE4 is selected by the V VQj ⁇ value.
  • the CQI values of the individual users should be transmitted as differential values.
  • the UE2 is selected by the V VQI ⁇ value. In this case, since several users are selected as CQI transmission targets, the CQI values of the individual users should be transmitted as differential values.
  • the number of UEs used as the CQI transmission targets is not a plural number, so that the Node-B does not transmit the differential value, and requests transmission of all CQI values of the current sub-frame. Thereafter, if a Rx SINR of the UE3 is low at step (3), the Node-B requests the UE3 to transmit the CQI by the SINR 1 value.
  • the CQI information of all users is transmitted as a differential value.
  • an amount of information for CQI transmission is reduced, so that the CQI differential value transmitted from each UE has bits of less than 1/4 as compared to bits required for the other case in which all the CQI information of the current sub-frame.
  • the CQI transmission channel is not additionally transmitted, all the CQI values of the UEl, UE2, UE3, and UE4 can be transmitted.
  • the Node-B can transmit only the CQI value of the UE3 according to the det_errori value. If the throughput of the UEl is lower than a required throughput, the CQI value of the UEl can be transmitted by the T 1 ⁇ T req value. Finally, if the channel variation is high, the CQI values of the UE2 and UE4 are transmitted as a differential value by the V VQI value. If the SINR value of the UE4 is low, the CQI values of the UE2 and UE4 are transmitted as a differential value by the SINR 1 value.
  • the above-mentioned steps have exemplarily disclosed the method for selecting UEs used as the CQI transmission targets, and calculating a differential value when several selected UEs exist, so that the capacity of the allocated CQI transmission channel and the amount of differential value information can be changed in various ways.
  • the degree of decreasing information amount may be unique for each system, and the decreasing information may maintain a specific level for a predetermined period.
  • the general trigged CQI reporting scheme can be defined as follows.
  • the factors to be considered for the CQI reporting can control the CQI reporting scheme of each UE by determining whether the transmission end has correct CQI information.
  • the present invention excludes a specific UE which has not established as the CQI reporting objectt from all the UEs, and must distribute the CQI reporting channel resources to the remaining UEs.
  • This distribution method may equally distribute the channel resources to individual UEs, or may allocate different-amount resources to the UEs in consideration of the characteristics (e.g., priority or QoS) of the UEs. If the CQI channel resources are insufficient, the accuracy of the CQI reported by each UE may be decreased, and an overall CQI reporting and a differential CQI reporting can be made available.
  • FIG. 34 is a block diagram illustrating characteristics of a Node-B according to another preferred embodiment of the present invention.
  • the Node-B in order to perform the feedback-information requesting method and the feedback- information receiving method according to the present invention, includes the priority decision unit 1201, the UE selection unit, and the ⁇ feedback-information transmission request unit 1203.
  • the priority decision unit 1201 determines the priority of the UEs.
  • the above-mentioned priority decision may be performed by a variety of parameters shown in FIG. 34.
  • the parameters do not have the same importance, so that the system of FIG. 34 may further include the weight assignment unit 1201a for assigning different weights according to importance information of the parameters.
  • the weights ⁇ ] — ⁇ b may be set to "0" if some parameters are excluded from parameters to be considered. Individual parameters to which differential weights are allocated are summed up by the adder 1201b, the priority information is completed as denoted by Priority high .
  • the UE selection unit 1201 receiving the above- mentioned priority information selects UEs used as the CQI reporting objects in consideration of the received priority information. In this case, the UE selection unit 1201 considers the allocation degree of the UL channel to be used for the CQI reporting of individual UEs, and selects UEs which are going to report the CQI. In more detail, the Node-B of FIG. 34 determines constituent modules of the UE selection unit 1201. If the priority is higher than a predetermined value, the Node-B selects a corresponding UE as the priority CQI reporting object, and may exclude some UEs from selected UEs according to channel condition information. The UE selection unit 1210 considers not only the priority information but also the UL channel allocation information at a single step, and may select the CQI reporting object according to the considered result.
  • the feedback-information transmission request unit 1203 transmits a CQI transmission request to the selected UE selected as the CQI transmission object.
  • the feedback-information transmission request unit 1203 may include a resource-allocation adjusting unit 1203a and a CQI request signal generator 1203b.
  • the resource- allocation adjusting unit 1203a determines whether the UL channel, via which each UE generating the CQI transmission request can report the CQI, will be equally allocated to individual UEs, and determines whether resources proportional to the priority information of the UEs will be allocated.
  • the CQI-request signal generator 1203b generates the CQI request signal according to the resource allocation information.
  • the generated CQI request signal is transmitted to the selected UEs by the transmitter (not shown) , and the receiver (not shown) receives the CQI transmitted from the UEs having received the CQI request signal.
  • the conventional problem occurs when the UE used as a transmission object has no available CQI information during the transmission of initial DL data.
  • FIG. 35 is a conceptual diagram illustrating a method for delaying data transmission until the CQI is received from the UE, and transmitting the delayed result according to a preferred embodiment of the present invention.
  • the embodiment of FIG. 35 shows an exemplary case in which the Node-B has data to be transmitted via the downlink channel and transmits data after the lapse of a long idle time, so that no CQI is received from the UE.
  • the embodiment of FIG. 35 has no information available for recognizing the DL-channel status.
  • the Node-B transmits the CQI reporting request to the UE at the time (t) , receives the CQI message from the UE, and transmits data to the UE at the (t+1) time.
  • Tx data may be delayed.
  • the 3GPP LTE scheme consumes the time of about 0.5ms from the CQI reporting request time of the Node-B to the CQI reception time of the Node-B.
  • the time of about 0.5ms is much shorter than a latency time of most traffic data .
  • the embodiment of FIG. 35 can more effectively manage resources according to a DL-channel situation recognized by the CQI.
  • the time delay of "+1" shown in FIG. 35 indicates the above-mentioned delay. In the case of the above-mentioned 3GPP LTE, it is preferable that the time delay may be set to 1 sub-frame.
  • the above-mentioned scheme is called a delayed initial data transmission scheme.
  • the delayed initial data transmission scheme will be described in detail from the viewpoint of data sequences to be transmitted at individual steps .
  • FIG. 36 shows the preferred embodiment of FIG. 35 from the viewpoint of a data stream to be transmitted according to individual steps according to the present invention.
  • FIG. 36 shows a method for storing the DL transmission data in the buffer.
  • the embodiment of FIG. 36 determines whether the buffer stores CQI information available for a corresponding DL channel to transmit DL data. If the above-mentioned CQI information is pre-guaranteed, the embodiment of FIG. 26 allocates the DL resources according to the general scheduling, and transmits data via the allocated DL resources. However, in the case of the initial data transmission (e.g., if data is initially transmitted via a corresponding DL channel, or- if data is transmitted after the lapse of a long idle time), the embodiment of FIG. 36 has no CQI information available for a corresponding DL- channel situation. In this case, the Node-B transmits the CQI reporting request message to the UE via the DL traffic channel at step ⁇ .
  • the UE Upon receiving the CQI reporting request message, the UE reports the CQI of a corresponding DL via the UL.
  • the initial CQI information generated by the UE is typically generated on the basis of a common pilot signal simultaneously transmitted along with the CQI request message.
  • the above-mentioned initial CQI information may be generated on the basis of a predetermined signal capable of indicating a DL-channel situation. If the Node-B receives the CQI, it transmits DL data delayed for a predetermined time consumed for receiving the CQI reporting message.
  • the delay degree of DL data may be indicated by a predetermined timeslot, a sub-frame, or an OFDM symbol according to the time consumed for receiving the initial CQI reporting message.
  • the 3GPP LTE scheme requires the time of about 0.5ms to receive the initial CQI message.
  • the time of about 0.5ms corresponds to the length of a sub-frame selected by most schemes. Therefore, as shown in FIG. 36, the embodiment of FIG. 36 considers the time consumed for receiving the initial CQI, and delays Tx data by a predetermined time corresponding to a single sub-frame, so that it transmits the delayed data.
  • the CQI information transmitted from the UE may be configured in the form of a differential CQI value, so that it reduces the number of bits indicating corresponding information and effectively sues the UL resources.
  • the delayed initial data transmission scheme transmits only a difference between a previous CQI value and a current CQI value, so that it may transmit a small amount of information as compared to the scheme for transmitting all the CQI values.
  • the present invention provides a method for establishing a common default CQI at both the Node-B and the UE during the initial data transmission, and reporting/receiving only the differential CQI during the next CQI transmission/reception time.
  • the UE if the UE receives the CQI reporting request message from the Node-B at step (2), the UE replies to the CQI reporting request message and transmits a differential value between a stored default CQI value and the generated CQI value, instead of transmitting all the CQI values.
  • the Node-B uses the same default CQI value as the UE' s default CQI value, acquires all the CQI values (i.e., an overall CQI value) on the basis of the received differential value, allocates downlink resources to the UE, and transmits data to the UE via the allocated DL resources.
  • the above-mentioned scheme of FIG. 36 can more effectively use the UL traffic resources than the method for reporting the entire CQI value.
  • the scheme of FIG. 36 can be applied to all steps from the CQI reporting step replying to the CQI reporting request message for initial data transmission.
  • FIG. 37 is a conceptual diagram illustrating a distributed resource allocation scheme and a localized resource allocation scheme according to the present invention.
  • the distributed resource allocation scheme shown in the left side of FIG. 37 distributes resources for data transmission to several frequency bands, instead of allocating the resources to only a specific frequency band, so that data is transmitted via the distributed resources.
  • the localized resource allocation scheme shown in the right side of FIG. 37 allocates resources for data transmission to only a specific frequency band.
  • the localized resource allocation scheme selects frequency band indicating good channel characteristics, and allocates resources to the selected frequency band, such that an overall throughput of the system can be increased.
  • the present invention provides a method for transmitting data according to the distributed resource allocation scheme shown in the left side of FIG. 37.
  • FIG. 38 is a conceptual diagram illustrating a method for transmitting initial data according to the distributed resource allocation scheme according to a preferred embodiment of the present invention.
  • the distributed resource allocation scheme in the case of initial data transmission (e.g., if data is initially transmitted via the DL channel, or if data is transmitted after the lapse of a long idle time) under the condition that there is no available CQI information for the DL-channels status, the distributed resource allocation scheme is designed to transmit data via the band composed of only a specific-area channel, so that an overall throughput of the system can be decreased.
  • the present invention provides a method for allocating/transmitting DL resources according to the distributed resource allocation scheme during the initial data transmission.
  • the present invention can reduce the number of data transmission errors because data is transmitted via the distributed channels.
  • the DL resources can be allocated according to the distributed resource allocation scheme because CQI indicating each channel condition of a corresponding DL is pre-guaranteed, and the DL resources can be allocated according to the localized resource allocation scheme.
  • CQI information transmitted from the UE may be configured in the form of a differential CQI value according to the above-mentioned delayed initial data transmission scheme.
  • the CQI value is an initially-reported CQI value
  • a predetermined reference for calculating the differential value is required.
  • the default CQI value commonly used for the Node-B and the UE is established and used to calculate the differential value.
  • a method for performing the initial data transmission using the default CQI value will hereinafter be described in detail.
  • FIG. 39 is a conceptual diagram illustrating a method for establishing a default CQI value during the transmission of initial data, and transmitting the established default CQI value according to a preferred embodiment of the present invention.
  • the UE may initially generate the CQI value using a common pilot signal received along with the CQI reporting request message.
  • the UE may receive the common pilot channel via a cell searching process or a synchronization acquisition process between the UE and the Node-B, such that it may recognize the DL-channel situation via the received common pilot channel.
  • the UE may easily generate the CQI indicating the most recent DL-channel . situation as compared to the Node-B. Therefore, the embodiment of FIG. 39 transmits a previous CQI value contained in the UE as a default CQI value to the Node-B before starting the initial data transmission, and the Node-B allocates DL resources via the default CQI value, and transmits data via the allocated DL resources.
  • the embodiment of FIG. 39 transmits data using the default CQI value received from the UE, and may continuously use the default CQI value during the next data transmission. However, it is preferable that the embodiment of FIG. 39 uses the new CQI value created by the common pilot signal transmitted along with the DL data. More preferably, if a differential CQI value is used as the CQI value, the UL resources can be more effectively used. As a result, the embodiment of FIG. 39 transmits data to the UE using resources allocated by the CQI value.
  • FIG. 40 is a conceptual diagram illustrating a method for transmitting the CQI of each user using the default-CQI establishing method of FIG. 39 according to the present invention.
  • the Node-B receives the default CQI value from the UEs.
  • the default CQI value may be generated by a common pilot signal, which has been received during either the synchronization acquisition step or the cell searching step before the UEl and UE2 receive the initial data from the Node-B, so that the default CQI value indicates a predetermined-level DL channel situation.
  • the Node-B receives the default CQI value from each UE, it is preferable that the CQI value to be received from each UE at the next step is set to the differential CQI value.
  • the individual UEs can effectively report the CQI.
  • the present invention does not report the default CQI value generated by the UE to the Node-B, and allows the Node-B and the UE to have the common default CQI value, so that it may report the next CQI value on the basis of the differential CQI value.
  • the default CQI value commonly used by the Node-B and the UE is used as a reference value for reporting the next differential CQI, so that the default CQI value may be pre-defined by a communication system or may be generated by the module for generating the same default CQI value contained in each of the Node-B and the UE. If the initial data transmission is performed using the predetermined default CQI value, it is preferable that data may be transmitted according to the delayed initial data transmission scheme or the distributed resource allocation scheme.
  • FIG. 41 is a block diagram illustrating an apparatus for delaying data transmission until the CQI is received during the initial data transmission, and transmitting the delayed result, and the Node-B including the apparatus according to a preferred embodiment of the present invention.
  • the Node-B according to the present invention includes a buffer 1101, a controller 1102, and a transceiver 1103 used as a transmitter/receiver. If data (DL_DATA k ) to be transmitted via the DL exists, this data (DL_DATA k ) is applied to the buffer 1101. In this case, the controller 1102 determines whether the available CQI value is stored in the buffer 1101.
  • the controller 1102 commands the transceiver 1103 to transmit the CQI reporting request message because there is no CQI value available for the buffer 1101. If the Node-B receives the CQI value from a corresponding UE by replying to the CQI reporting request message, the CQI value is transmitted to the buffer 1101 and the controller 1102 as shown in FIG. 11. Upon receiving the CQI value, the controller 1102 allocates the DL resources.
  • the controller 1102 transmits DL data (DL_DATA k+1 ) .
  • Tx DL data is delayed by a predetermined time corresponding to the 1 sub- frame as compared to the initial DL data, so that the DL data can be stably transmitted.
  • FIG. 42 is a block diagram illustrating an apparatus for transmitting data according to the distributed resource allocation scheme, and the Node-B including the apparatus according to another preferred embodiment of the present invention.
  • the Node-B includes a buffer 1201, a controller 1202, and a transceiver 1203.
  • the Node- B of FIG. 42 determines whether the buffer 1201 includes available CQI values during the initial DL data. If there is no available CQI value, the controller 1201 generates a command for performing initial data transmission according to the distributed resource allocation scheme, so that DL data stored in the buffer 1201 is transmitted. In this case, it should be noted that the above-mentioned Tx DL data has no delay until the CQI is received from the UE, differently from the initial DL data transmitted from the Node-B of FIG. 41. If the initial DL data is transmitted from the transceiver 1203, the embodiment of FIG.
  • the received CQI value may be a differential CQI value created on the basis of the default CQI value commonly contained in the Node-B and the UE, so that UL resources can be effectively used.
  • FIG. 43 is a block diagram illustrating an apparatus for transmitting data using the default-CQI value during the transmission of initial data, and the Node-B including the apparatus according to a still another preferred embodiment of the present invention.
  • the embodiment of FIG. 43 includes a buffer 1301, a controller 1302, and a transceiver 1303. In this case, if it is determined that the buffer 1301 has no CQI value available for the initial DL data transmission at steps ® and (2), the embodiment of FIG. 43 may generate a transmission command of the initial DL data on the basis of the default CQI value.
  • the default CQI value may be a default CQI value commonly contained in the Node-B and the UE according to the communication standard prescribed for the communication system. Otherwise, the default CQI value may be a default CQI value reported to the Node-B. In this case, the default CQI value reported to the Node-B may be generated by signals, which are received in the synchronization estimation step and the cell searching step before the corresponding UE receives the initial DL data. In this way, if the transceiver 1303 transmits the initial DL data using the default CQI value, it may receive the CQI value from a corresponding UE.
  • the UL resources can more effectively used.
  • the above-mentioned preferred embodiments have disclosed an exemplary case in which the reception end of data transmits the CQI value and the corresponding band position information to the transmission end, it should be noted that all kinds of predetermined feedback signals, each of which transmits both feedback information corresponding to the data reception and the position information of the data Rx band, may also be covered with the scope and spirit of the present invention.
  • the present invention transmits not only the CQI value but also the Rx band position information as feedback information, so that it can reduce the number of errors created when the Node-B tracks the CQI variation in the OFDM system capable of transmitting data via divided Tx bands. Therefore, the present invention can be effectively used for the cognitive radio communication system.
  • the present invention allows the differential information to indicate the increment, decrement, and the same status between the current signal and the previous signal, so that it can more accurately track the CQI information.
  • the present invention can easily change the range of a differential value according to the variation speed of the differential information, and the mobility is gradually emphasized. As a result, the present invention can be effectively applied to the rapidly-changing channel.
  • the Node-B decomposes the resources allocated for transmission of the feedback information according to priority information of individual UEs, so that the allocated resources can be effectively used.
  • the present invention can be effectively applied to a communication system equipped with several UEs.
  • the present invention provides a method for effectively transmitting data at the initial data transmission. If data is not transmitted to a destination during a long period of time, or if data is firstly transmitted to the destination, the present invention can be effectively used.

Abstract

L'invention concerne un procédé d'émission/réception d'information en retour, et un procédé d'émission/réception de données utilisant ce premier procédé. Ces procédés permettent d'aquérir des informations correctes concernant les voies, de réduire la surcharge, et d'allouer de manière efficace les ressources au début de la transmission. Selon l'invention, le procédé permettant à un premier terminal récepteur de transmettre des informations en retour consiste à recevoir un message de demande de transmission d'information en retour en provenance d'un terminal émetteur, à générer des informations en retour contenant à la fois des informations de position de bande en indiquant la position des données lors de leur réception, et une valeur d'indication de qualité de voie indiquant la qualité de la voie correspondant à la bande, et à transmettre les informations en retour.
PCT/KR2007/004014 2006-08-22 2007-08-22 Procédé d'émission/réception d'information en retour, et procédé d'émission/réception de données utilisant ce premier procédé WO2008023930A2 (fr)

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KR10-2006-0079341 2006-08-22
KR1020060079341A KR101253169B1 (ko) 2006-08-22 2006-08-22 피드백 정보 보고 및 분석을 위한 방법 및 장치
KR1020060080360A KR101319869B1 (ko) 2006-08-24 2006-08-24 초기 데이터 전송 방법, 이를 지원하는 기지국, 및 초기데이터 수신 방법
KR10-2006-0080360 2006-08-24
KR1020060085189A KR101221904B1 (ko) 2006-09-05 2006-09-05 피드백 정보의 송신요청 및 수신 방법과, 이를 수행하는기지국
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CN114095367B (zh) * 2020-07-30 2023-05-09 大唐移动通信设备有限公司 一种状态反馈方式的配置方法、状态反馈方法及装置

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